In the national macro-control continued to drive, China's gear reducer industry gradually developed into the international reducer industry's main battlefield. China is currently in a period of economic and social development, and the reducer industry as China started earlier "old industry", is bound to make a certain example, to promote China's economic and social development to achieve a smooth transition.

Benefit from the industrialization and urbanization of the deepening of the process and the country's attention to the machinery manufacturing industry, reducer industry as one of China's basic equipment industry. At the same time, China's economic development into the depth of the adjustment period, reducer industry also will enter the transformation and upgrading.

   June 19, 2016, domestic enterprises independently developed cycloid envelopes precision reducer, harmonic reducer, cycloid steel ball reducer, wheel motor reducer 4 high precision reducer in Shanghai International Gear Transmission Equipment Exhibition With the international high-end robot slowdown on the same stage.

   This is our country in the field of precision reducer made a major breakthrough. Reducer as a modern construction in the essential transmission equipment, is used in various industries.

   Downstream industry to promote the development of reducer industry

   The downstream application industry of the reducer includes all areas of the national economy and the defense industry, such as lifting and transporting, cement building materials, heavy mining, metallurgy, electric power and aviation. As the downstream market to force, China's gear reducer industry development prospects, the specific analysis is as follows:

   1, lifting transport equipment industry demand for reducer prospects

   China's lifting transport equipment manufacturing industry is facing good opportunities for development. Urbanization accelerated implementation, making the city infrastructure construction gave birth to a huge demand for machinery and equipment, which for the lifting of transport equipment manufacturing enterprises to create a good macro environment.

   Lifting and transport equipment is the most widely used industry of reducer, the development of the industry directly affect the growth rate of the slowdown in the market demand. Expected "second five" period, China's lifting transport equipment manufacturing industry will continue to maintain the momentum of rapid growth, benefit from this, reducer demand will also be effectively driven.

   2, the cement machinery industry demand for reducer prospects

   Cement machinery as an important industry to revitalize the cement industry. With the country's policy support for infrastructure construction and the cement industry to increase the intensity of macro-control, cement machinery market demand growth will be more broad, cement machinery industry will move in a more rational direction. Reducer is the cement machinery used in the second category of general machinery and equipment, its market boom must be accompanied by strong demand for cement machinery industry and continue upward.

   3, metallurgical machinery industry demand for reducer prospects

   In recent years, under the guidance of the national macro - control, the steel industry strictly control the total production capacity, speed up the elimination of backward production capacity, and strictly control the new capacity. Iron and steel industry has experienced a long-term extensive expansion, the urgent need to speed up structural adjustment and industrial upgrading, and this adjustment to the metallurgical heavy machinery manufacturing industry, especially high-tech high-end equipment manufacturing industry has brought challenges, but also brought market opportunities The

   Overall, the opportunity is greater than the challenge, "second Five-Year" period of environmental protection and large-scale high-performance iron and steel smelting equipment will usher in a new round of rapid growth. As an important supporting equipment for metallurgical equipment, the demand for reducer in metallurgical equipment will also be effectively driven.

   4, the robot industry demand for reducer prospects

   Robot industry is now the most eye-catching industry, the development of space Needless to say. Precision reducer is the most critical functional components of industrial robots, robot industry chain is a vital application of the link.

   According to the state authorities predict that 2015 to 2018, China's industrial robots on the reducer of the new demand will reach 23.6 million units, 296,000 units, 369,000 units and 462,000 units. In addition, the domestic market for industrial robots in accordance with the general life of 8 to 10 years, the future of domestic precision reducer market demand will be more than 100 million units, the annual market sales will exceed 10 billion yuan.

   China has become the main battlefield of the international reducer industry

   After more than 40 years of market development and decline, the Chinese reducer products from the initial single cycloid reducer to the current gear reducer, worm reducer, and is widely used in electrical machinery, metallurgical machinery, environmental protection Machinery, chemical machinery, food machinery, mining machinery, construction machinery, water conservancy machinery and other areas of national economy, much favored by the market.

   China's reducer industry after several generations of joint efforts have been formed after a huge industrial scale, at present, China's reducer products not only meet the needs of the domestic mainstream market, but also exported to foreign countries, and occupy a certain position in the international market , Can be described as renowned Chinese and foreign, China has become the world reducer manufacturing power.

   In the national macro-control continued to drive, China's gear reducer industry gradually developed into the international reducer industry's main battlefield. World-renowned enterprises have stationed in China's reducer market, and by virtue of excellence in the brand, strong capital, advanced technology and equipment and other advantages, and domestic reducer enterprises launched a fierce competition. And mainly engaged in general reducer production of domestic enterprises, industrial-specific reducer in the field of less involved, industrial technology is not yet mature, therefore, in competition with foreign advanced enterprises, China's reducer enterprises want to occupy the dominant market competition Status, but also need to go through a long period of time the market sharpened.

   The slow recovery of the world economy so that the global consumer market once again active, at the same time, China's macroeconomic policy effect and infrastructure investment efforts continue to strengthen, will drive the metallurgy, electricity, construction machinery and other industries on the demand for reducer Substantial growth.

   China 's reducer transformation in three directions

   China is currently in a period of economic and social development, and the reducer industry as China started earlier "old industry", is bound to make a certain example, to promote China's economic and social development to achieve a smooth transition.

   China's gear reducer industry transformation can start in three directions:

   First of all, with the national support for green-type reducer, reducer industry restructuring should pay attention to establish and improve the innovation system and mechanism, adhere to the chemical industry refinement, recycling, equipment manufacturing industry intelligent, high-end, the pharmaceutical industry biochemical , Serialization, high-end emerging industries, integration as the core, and jointly promote the healthy and efficient development of the industry.

   Second, the reducer enterprises to strengthen cooperation with large domestic and foreign large consortia. At present, foreign economic situation is not optimistic, innovative reducer enterprises to large projects, good projects as the support, continue to increase the technical and technical personnel investment, and constantly form a "attract large projects, cultivate large enterprises, gathering large industry, Park "development strategy.

   Finally, the industry to cultivate the brand and apply for a patent, in the transformation and upgrading and innovation and development of the soft environment to speed up the creation of speed. Decelerator economy in the field of mechanical transmission industry involved in the product categories, including various types of gear reducer, planetary reducer and worm reducer, including a variety of special transmission device speed control devices, speed control devices, and including flexible transmission within the various types of complex Transmission equipment and other products and services related to metallurgical, color, coal, building materials, ships, water conservancy, electricity, engineering machinery and petrochemical industries.

   The development of the industry not only requires the coordination of the industrial chain, the establishment of innovative system, but also the driving force of leading enterprises. When the power gradually increased, benign operation capacity of the superposition, the development of the industry will continue to improve, upgrade, toward a healthy and efficient development.

In the market after a long period of sharpening and development, gradually evolved into the dominant force covering China's market, reducer show the vitality of the world shocked. 2017 reducer industry prospects for the development of attention, the following will be introduced through the downstream industry to introduce the role.

With the rapid development of the domestic economy in recent years, heavy machinery industry exports increased, as an important basic industry reducer industry development is extremely rapid. Reducer enterprises are expanding production and sales scale, processing capacity and technical level continued to improve development. Future reducer market prospects will be a good job.

Benefit from the industrialization and urbanization of the deepening of the process and the country's attention to the machinery manufacturing industry, reducer industry as one of China's basic equipment industry. At the same time, China's economic development into the depth of the adjustment period, reducer industry also will enter the transformation and upgrading.

2017 reducer industry development prospects analysis: the downstream industry to promote development

Reducer as a modern construction in the essential transmission equipment, is used in various industries.

Reducer industry development prospects: the downstream industry to promote the development of reducer industry

The downstream application industry of the reducer includes all areas of the national economy and the defense industry, such as lifting and transporting, cement building materials, heavy mining, metallurgy, electric power and aviation. As the downstream market to force, China's gear reducer industry development prospects, the specific analysis is as follows:

1, lifting transport equipment industry demand for reducer prospects

China's lifting transport equipment manufacturing industry is facing good opportunities for development. Urbanization accelerated implementation, making the city infrastructure construction gave birth to a huge demand for machinery and equipment, which for the lifting of transport equipment manufacturing enterprises to create a good macro environment.

Lifting and transport equipment is the most widely used industry of reducer, the development of the industry directly affect the growth rate of the slowdown in the market demand. Expected "second five" period, China's lifting transport equipment manufacturing industry will continue to maintain the momentum of rapid growth, benefit from this, reducer demand will also be effectively driven.

2, the cement machinery industry demand for reducer prospects

Cement machinery as an important industry to revitalize the cement industry. With the country's policy support for infrastructure construction and the cement industry to increase the intensity of macro-control, cement machinery market demand growth will be more broad, cement machinery industry will move in a more rational direction. Reducer is the cement machinery used in the second category of general machinery and equipment, its market boom must be accompanied by strong demand for cement machinery industry and continue upward.

3, metallurgical machinery industry demand for reducer prospects

In recent years, under the guidance of the national macro - control, the steel industry strictly control the total production capacity, speed up the elimination of backward production capacity, and strictly control the new capacity. Iron and steel industry has experienced a long-term extensive expansion, the urgent need to speed up structural adjustment and industrial upgrading, and this adjustment to the metallurgical heavy machinery manufacturing industry, especially high-tech high-end equipment manufacturing industry has brought challenges, but also brought market opportunities The

Overall, the opportunity is greater than the challenge, "second Five-Year" period of environmental protection and large-scale high-performance iron and steel smelting equipment will usher in a new round of rapid growth. As an important supporting equipment for metallurgical equipment, the demand for reducer in metallurgical equipment will also be effectively driven.

4, the robot industry demand for reducer prospects

Robot industry is now the most eye-catching industry, the development of space Needless to say. Precision reducer is the most critical functional components of industrial robots, robot industry chain is a vital application of the link.

According to the state authorities predict that 2015 to 2018, China's industrial robots on the reducer of the new demand will reach 23.6 million units, 296,000 units, 369,000 units and 462,000 units. In addition, the domestic market for industrial robots in accordance with the general life of 8 to 10 years, the future of domestic precision reducer market demand will be more than 100 million units, the annual market sales will exceed 10 billion yuan.

According to the China Report Hall released 2016-2021 China's gear reducer industry market supply and demand forecast depth of the research report shows that China's macroeconomic policy effect and infrastructure investment efforts continue to strengthen, will drive the metallurgy, electricity, construction machinery Industry demand for reducer growth.

First gazes the industrial research institute to issue "In front of 201,312,000 Year Chinese Speed reducer Profession Market To gaze with Investment Strategy Plan Analysis Report" the data display, 201,112,000 year our country speed reducer manufacture profession management target whole presents the growth tendency, in 2012, the profession gross value of industrial output is 65,800,000,000 Yuan, compared the last year to grow 8.06%; The sales income is 64,360,000,000 Yuan, compared the last year to grow 7.23%; The profession gross asset and the debt scale respectively are 52,300,000,000 Yuan and 26,800,000,000 Yuan.Under the new statistical caliber, in 2012 above the profession scale enterprise quantity has 439, the jobholders manner, the profit total amount is 4,704,000,000 Yuan.

First gazes the industrial research institute to issue "In front of 201,312,000 Year Chinese Speed reducer Profession Market To gaze with Investment Strategy Plan Analysis Report" analyzes believed that, the speed reducer factory downstream application profession mainly includes lifts heavy objects the transportation, the cement building materials, the heavy mine, the metallurgy, the electric power and the navigation empty ship uses and so on the national economies and defense industry each domain.Because the downstream market gives the strength, Our country Speed reducer Factory prospects for development favor, the concrete analysis is as follows:

First, lifts heavy objects the transport vehicle profession to the speed reducer demand prospect

First gazes the industrial research institute to issue "In front of 201,312,000 Year Chinese Speed reducer Profession Market To gaze with Investment Strategy Plan Analysis Report" analyzes believed that, our country lifts heavy objects the transport vehicle manufacture profession faced with the good development opportunity.In 2013 our country exterior development environment overall return to warmer weather, the domestic investment hopeful realization grows quickly, this for lifted heavy objects the transport vehicle manufacture enterprise to develop has created the good macroscopic environment.Lifts heavy objects the transport vehicle is the speed reducer applies the most widespread profession, this profession development speed is directly affecting the speed which the speed reducer factory market demand grows.Estimate; 35 period, our country will lift heavy objects the transport vehicle manufacturing industry to continue to maintain the fast growth the tendency, will profit in this, the speed reducer demand will also obtain effective drawing.

Second, cement mechanical profession to speed reducer demand prospect

"cement industry; 35 development plans" right; 35 period cement profession development sets following goal: To 2015, the scale above enterprise industry increase in value yearly average grows above 10%, the elimination backwardness cement produces energy, the main pollutant realization standards emissions, coordination handling makes the distinct progress, the comprehensive utilization reject total quantity enhances 20%, argued vigorously to 42.5 level of and above product expense proportion achieved above 50%, the first 10 enterprises produced the concentration degree to achieve above 35%.

First gazes the industrial research institute to issue "In front of 201,312,000 Year Chinese Speed reducer Profession Market To gaze with Investment Strategy Plan Analysis Report" analyzes believed that, the cement machinery takes the promotion cement industry the important profession.Along with the country to the infrastructure construction policy support dynamics as well as to the cement profession macroeconomic regulation and control dynamics enlarge, the cement mechanical market demand substantial room for growth will be broader, the cement mechanical profession will face a more reasonable direction to develop.The speed reducer is the second big kind of general mechanical device which in the cement machinery uses, its market boom inevitably follows the cement mechanical profession exuberant demand to continue upward.

The correct installment, uses and maintains the speed reducer, is the guarantee mechanical device normal operation important link.Therefore, installs the NEUGART planet speed reducer when you, please by all means must strictly according to following do install the use correlation item, earnestly assembly and use.

First step is before the installment confirmed electrical machinery and speed reducer is whether perfect, and strictly inspects various spots size which the electrical machinery and the speed reducer connect whether matches, here is the electrical machinery localization lug boss, the input axis and the speed reducer scoop channel equidimension and the tolerance on fit.

　　Second step is turns on lathe on the speed reducer flange flank dustproof hole the bolt, adjusts the PCS system clamping collar to cause its side hole and dustproof Kong Duiqi, in the insertion the hexagon tightens.Afterwards, takes the electrical machinery shaft key.

The third step is the electrical machinery and the speed reducer nature connection.When connection must guarantee the speed reducer output shaft is consistent with the electrical machinery input axis concentricity, also the two flank flange is parallel.If the concentricity is inconsistent, can cause the electrical machinery axis to break off or the speed reducer gear attrition.

　　Moreover, when installment, forbid strictlys and so on striking with the iron hammer hits, prevents the axial force either the radial force oversized damage bearing or the gear.Again after certainly must install the bolt tightens tightens the tight strength bolt.Before the installment, the electrical machinery input axis, locates the lug boss and the speed reducer connection spot pickling oil cleans with the gasoline or the zinc sodium water only.Its goal is guarantees the connection compactness and the revolution flexibility, and prevents the nonessential attrition.

In the electrical machinery and before the speed reducer connection, please first be vertical the electrical machinery shaft key trough and the tight strength bolt.In order to guarantee the stress is even, please first install the random opposite angle position the bolt to turn on lathe, but do not have to tighten, then turns on lathe other two opposite angle position to install the bolt finally to tighten four to install the bolt one by one.Finally, tightens the tight strength bolt.All tight strength bolt needs the moment of force spanner to carry on fixed and the inspection according to the mark fixed moment of torsion data.

Right angle speed reducer correlation data with same model straight line speed reducer incompletely same, but also asks the user to pay attention.

　　Correct installment correct installment similar speed reducer and actuation electrical machinery between speed reducer and between mechanical device.The key is must have to guarantee the speed reducer output shaft with actuates department the split axle concentricity to be consistent.

DESCRIPTION

AC motor is used to achieve mechanical energy conversion and AC power machinery. Due to the huge development of power systems AC, AC motor has become the most commonly used motors. AC motor compared with DC motors, because there is no commutator structure is simple, easy to manufacture, relatively strong, easy to make high-speed, high-voltage, high-current, high-capacity motor. Coverage AC motor power is great. AC motors are usually divided according to their function alternators, AC motors and synchronous condenser categories. Because of the reversibility of the motor operating state, the same motor can be made not only for the generator motor. The motor into a generator and the motor is not very accurate, but some main motor as a generator to run some motors mainly for the motor is running.

Text

Achieve mechanical energy conversion and AC power machinery. Due to the huge development of power systems AC, AC motor has become the most commonly used motors. AC motor compared with DC motors, because there is no commutator (see DC motor commutation), the structure is simple, easy to manufacture, relatively strong, easy to make high-speed, high-voltage, high-current, high-capacity motor. Coverage AC motor power widely, from a few watts to hundreds of thousands of kilowatts, or even millions of kilowatts. The early 1980s, the largest turbine generator has reached 1.5 million kilowatts.

AC motors are usually divided according to their functions alternators, AC motors and synchronous condenser categories. Because of the reversibility of the motor operating state (see motor), the same motor can be made not only for the generator motor. The motor into a generator and the motor is not very accurate, but some main motor as a generator to run some motors mainly for the motor is running.

AC motors by species divided synchronous motors, asynchronous motors into two categories. Ns with the same rotation speed of the rotating magnetic field synchronous motor rotor speed, called synchronous speed. ns and the connected alternating current frequency (f), between the number of motor poles (P) of a strict relationship

ns = f / P in China, the power frequency is 50 Hz, so the two-pole synchronous motor speed of 3000 rev / min, four-pole motor synchronous speed of 1500 rev / min, more than analogy. Induction motor rotor speed is always lower or higher than the rotating magnetic field, the name of the resulting asynchronous. Poor induction motor rotor speed and the speed of the rotating magnetic field (called slip) is usually less than 10%. From this, the AC motor (either synchronous or asynchronous) are subject to the speed of power frequency constraints. Thus, AC motor speed control is more difficult, the best way is to change the frequency of the power, but in the past to change the power frequency is more complex. So 70 years ago, asking the governor of the occasion, the use of DC motors. With the development of power electronics technology, frequency conversion technology has begun to get the AC motor practical.

Generally use a three-phase AC motor system, as compared to the three-phase AC motor with single-phase motors, both in terms of performance, utilization and price of raw materials has obvious advantages. The same power three-phase motor size smaller than the single-phase motor, light weight, low price. Three-phase motor with self-starting. Single-phase motor is not starting torque, start to solve the problem, we need to take some special measures (see the single-phase induction motor). Single-phase motor torque is pulsating, the noise is relatively large, but the required power is relatively simple, especially for use in the home is very convenient. So small household electrical and instrument motor multi-use single-phase motor.

Single-phase ground fault definition:

Three-phase power system, the insulation between a phase conductor and appear only destruction.

Broadly speaking, single-phase ground faults include single-phase ground short circuit, single-phase ground short circuit is a single-phase ground fault in a special phenomenon, only transformer neutral grounding system will have.

In the narrow sense, single-phase fault and single phase short circuit the two concepts. It is a fault, an accident.

Power system failure and accident is narrow distinction.

Single-phase ground short circuit means FireWire (any one phase) without direct load and the ground is turned on, the power supply system in 380/220 or other grounding system, since the neutral transformer is grounded, and the grounding resistance is small , FireWire (any phase) without load and the ground directly connected, instantly generate a large current, blown wire, power distribution equipment or tripping, so a single ground fault is a serious accident, electricity system as much as possible to avoid.

In the power system, there are many places with ungrounded power supply systems, such as in dusty, explosive and other special venues, our country all 6-10 kV, 35 kV power supply system, are used in neutral point is not isolated or high resistance grounded power supply system, such a system after a single-phase, since no loops or did not produce a large current circuit, no ground current or no large ground currents, it does not affect the normal operation of the system. While not affecting the normal operation of the system, but is a single-phase ground fault, in order to prepare the ground for the two-phase expansion or cause further damage and other ground equipment, rules of the single-phase fault occurs after two hours to check in explain the reasons to deal with, the cause could not be processed within two hours or, in order to supply power after treatment.

Single-phase ground fault finding Daquan

For small current grounding system, how to quickly find the single-phase fault, I'll give you some simple method.

1, manual search method

If the grounding line selection device is not installed in the substation, nor install or short-circuit ground fault indicator fault indicator combo on line, there is no good ground fault detector, it had to use the artificial look awkward. Find the following steps:

⑴ by hand (or scheduling, the same below) in order to wind up, you can know which of substation grounding outlet, scheduling to know which phase ground.

⑵ Then there are two ways to find fault points: First, the line sequential segmentation, or will often faulty line opened, relative insulation 2.5kV shake table testing ground, that part of the insulation resistance is small fault section, in order to restrict the search (of course, in the substation outlet side must do hang ground wire and other security measures); the second is the line as far as possible segment, then progressively close again transmission, interactive and scheduling coordination, there is The segment is residual voltage fault zone alarm.

Artificial method of operation is very troublesome to find, if the line is long, multi-branch, switch segment was small and it is difficult to operate, plus weather and bad weather, it is more a bad deal. Recommendations or adopt some technological means less investment in equipment to match the artificial look, you can achieve a multiplier effect, providing both power supply reliability and social benefits, but also creates economic benefits.

2, the use of grounding line selection device and fault indicators to find

Substations are generally installed a grounding line selection device, although sometimes allowed, but can provide technical reference for artificial wind up. Then the line install some fault indicator (or short-circuit ground fault indicator combo), this indicates a ground fault approach. More reliable ground fault detection method is the use of signal source method, more sensitive ground fault detection method is to use the first half-wave method or the DC transient analysis. We recommend using two fault indicator combination of methods to find better ground fault in the signal source method mainly to the first half-wave method or the DC transient analysis supplement.

3, the use of feeder automation methods to find

If you have money, it is recommended to use the feeder automation methods to locate ground faults. The method uses intelligent switching (electric load switch, segmentation, circuit breakers, reclosers + FTU) logic functions to replace the traditional manual search method, and can automatically implement fault isolation, recovery and transfer of power. Suppose one pair of power supply line hand in hand into six sections, namely a 5-intelligent switch (bilateral with the three-phase five-column capacitive signal PT or PT), the middle station do contact, and a ground fault in the first and second smart switch between, for example, concrete steps are as follows:

⑴ grounding outlet wind up power substation, intelligent switches each segment on the line automatic gates.

⑵ substation switch on power transmission, power zero-sequence voltage is not alarm, the zone restore power success; first intelligent switch FTU line voltage is detected, but did not detect zero-sequence voltage, the delay automatic closing after a period of time , because close to the ground fault is detected zero-sequence voltage, it is immediately opening and "locking"; second intelligent switch also detects zero-sequence voltage, the switch does not move and "blocking" Cancel "energized delay automatic Closing "function.

⑶ intermediate contact switch detects unilateral power failure, automatic closing delay for some time, because the fault is not in the zone, there is no zero-sequence voltage is detected, the transfer of power sector success.

⑷ contact switch after transmission, the second smart switch detects the line voltage, zero-sequence voltage is not detected, but there are "blocked" in the former, it canceled "energized delay automatic switch" function switch in the quintile .

⑸ At this point, the ground fault zone has been separated from other non-fault section have been restored or transfer of power.

4, changing the way to find a neutral ground

Distribution system using ungrounded or via Petersen coil grounding method has advantages and disadvantages. For troubleshooting difficult "malpractice" and some of the personal and property safety of the resulting problems, the users themselves are further thinking, thinking out of the scheme are two:

⑴ will be changed to neutral grounding via low resistance. After the transformation, the use of export breaker two zero-sequence protection function and fault indicator, basically to get rid of about 70% of the ground fault find the problem, but there are about 30% of the medium-resistance and high resistance ground fault bad Find, may also exist with the line fuse protection coordination problems. Measurement data for such a system, a better solution is to use the digital fault indicator, the zero-sequence current (cable), total current line (overhead), the insulation voltage (overhead), and other indicators through wireless communication Send to network scheduling system, comprehensive analysis of substation real-time and historical information, determine ground position.

⑵ neutral changed little resistance + resistance + high-voltage circuit breaker or the contactor mode. High-voltage circuit breaker or contactor usually in quintile, only when the system detects zero after raising only delay closing sequence voltage, short-term changes in resistance or low resistance grounded, then the method to detect small resistance - grounded to find fault. In addition, since the neutral point resistance-off can be flexibly controlled, you can ring action after Petersen, then at a certain timing to control the resistance of combined points-off, so that the protective devices or make a ground fault indicator identifies the signal and indicates the ground current channels.