Coal mining machine and rocker arm transmission device and rocker arm transmission method thereof

Abstract

The invention discloses a coal mining machine and a rocker arm transmission device and a rocker arm transmission method thereof, and belongs to the technical field of coal mining machines, the rocker arm transmission device comprises a rocker arm shell, a first shell arranged at the bottom of one end of the rocker arm shell, a second shell arranged at the top of the other end of the rocker arm shell, and a control unit arranged in the coal mining machine, a first chain wheel is arranged in one end of the rocker arm shell, a second chain wheel is arranged in the other end of the rocker arm shell, a transmission chain is arranged between the first chain wheel and the second chain wheel, and the transmission chain is connected to the periphery of the first chain wheel and the periphery of the second chain wheel in a meshed mode and arranged in the rocker arm shell. The permanent magnet motor is adopted to replace a traditional asynchronous motor, a straight tooth transmission gear is omitted, the mechanical transmission distance is shortened, the problem that a traditional rocker arm is poor in lubricating, cooling and cutting capacity and electricity-saving performance is solved, the mechanical fault rate of a system is reduced, the production efficiency is further improved, and due to the fact that the permanent magnet motor is simple in structure, the inner structure of the rocker arm is simplified. And the maintenance complexity is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal mining machine, and particularly relates to a coal mining machine and a rocker arm transmission device and a rocker arm transmission method thereof. BACKGROUND

[0002] As a core electromechanical and hydraulic integrated mining equipment in coal mine, the coal mining machine greatly improves the coal mining efficiency, effectively reduces the labor intensity, and provides an important guarantee for the safety of coal mine production. The rocker arm is a key component of the coal mining machine, mainly bearing the core functions of transmitting cutting power and resisting the reaction force of coal and rock, and thus has a relatively high failure probability in the coal mining operation. The rocker arm of the conventional double-drum coal mining machine is generally driven by a high-speed small-torque asynchronous motor, rotates the drum at a fixed speed through a fixed spur gear transmission and planetary reduction structure, and completes the coal cutting and loading operation. The transmission system is usually designed with four-stage reduction, specifically three-stage spur reduction + one-stage planetary reduction or two-stage spur reduction + two-stage planetary reduction, and the entire transmission chain contains 7-9 shafts with a transmission efficiency of about 80%.

[0003] However, the existing coal mining machine rocker arm has many technical problems in actual application: first, the transmission chain is too long, and the rocker arm is in a fixed inclined posture for a long time, which causes the lubricating oil in the gear cavity to fail to efficiently lubricate the gears and bearings of the entire transmission system, seriously shortening the service life of the rocker arm; second, the rotation speed of the driving motor and the transmission ratio are fixed, and the drum can only operate at a fixed speed, and the cutting resistance increases exponentially in harsh conditions, and the production capacity cannot be improved due to the limited cutting speed in good conditions; third, the high-speed small-torque asynchronous motor has the defects of large starting current, high loss and low efficiency, and cannot realize frequency conversion, has poor cutting adaptability, and the high-speed components are easy to be damaged due to high rotation speed and large heat dissipation; fourth, the rocker arm shell deformation causes gear transmission system failure, affecting the operation stability. Therefore, there is an urgent need for a coal mining machine and a rocker arm transmission device and a rocker arm transmission method thereof. SUMMARY

[0004] To solve the above-mentioned technical problems in the prior art, the present application provides a coal mining machine and a rocker arm transmission device and a rocker arm transmission method thereof.

[0005] In one aspect of the present application, a rocker arm transmission device of a coal mining machine is provided, comprising a rocker arm shell, a first shell arranged at the bottom of one end of the rocker arm shell, a second shell arranged at the top of the other end of the rocker arm shell, and a control unit arranged in the coal mining machine, wherein: The first sprocket is arranged at one end of the rocker arm housing, and the second sprocket is arranged at the other end of the rocker arm housing. The first housing is provided with a first speed reducer, and a permanent magnet motor is connected to the first speed reducer through a transmission shaft below the first speed reducer. The second housing is provided with a second speed reducer, and a roller is connected to the second speed reducer through a roller seat above the second speed reducer.

[0006] Further, in the rocker arm transmission device of the coal mining machine, the permanent magnet motor cooperates with the first speed reducer and the second speed reducer to form an integrated permanent magnet motor speed reducer.

[0007] Further, in the rocker arm transmission device of the coal mining machine, the first speed reducer and the second speed reducer are both planetary speed reducers.

[0008] Further, in the rocker arm transmission device of the coal mining machine, the permanent magnet motor is an internal permanent magnet synchronous motor.

[0009] Further, in the rocker arm transmission device of the coal mining machine, the transmission chain is a roller chain.

[0010] The rocker arm transmission method of the coal mining machine provided by the application comprises the following steps. Step 1: The permanent magnet motor is started by the control unit, the output end of the permanent magnet motor drives the first speed reducer through the transmission shaft, and the output end of the first speed reducer drives the first sprocket to rotate through the input shaft. Step 2: Since the teeth of the first sprocket cooperate with the transmission chain, the transmission chain in turn drives the second sprocket to rotate synchronously. Step 3: The second sprocket drives the second speed reducer through the output shaft, and the output end of the second speed reducer drives the roller seat to provide power for the operation of the roller.

[0011] In another aspect of the application, a coal mining machine is also provided, which comprises the above-mentioned rocker arm transmission device.

[0012] The coal mining machine and the rocker arm transmission device and method thereof have the following advantages and positive effects. (1) The permanent magnet motor is adopted to replace the traditional asynchronous motor, the straight-tooth transmission gear is omitted, the mechanical transmission distance is shortened, the problems of poor lubrication, cooling, cutting capacity and power saving performance of the traditional rocker arm are solved, the system mechanical failure rate is reduced, and the production efficiency is improved, and since the permanent magnet motor has simple structure, the internal structure of the rocker arm is simplified, and the maintenance complexity is reduced; (2) The flexible transmission is realized by the roller chain transmission system in the application, the transmission failure problem caused by the deformation of the rocker arm shell is effectively solved, the structure is compact, the operation is convenient, the practicality is strong, the gear wear problem is avoided, the operation noise is small, the maintenance work of frequently replacing the lubricating oil is avoided, and for the double-drum coal mining machine, the rotation speeds of the front drum and the rear drum can be adjusted through the control unit respectively, the front drum focuses on cutting coal and rock, the rear drum is high-speed coal loading, and the coal loading efficiency is further improved; (3) The built-in permanent magnet synchronous motor is adopted to reduce the output speed, the transmission chain is shortened, the shell volume at the output shaft is reduced, the optimization of the motor installation position makes the mass center of the rocker arm close to the fuselage, the operation stability is enhanced, the motor supports variable frequency speed regulation, the rotation speed can be accurately adjusted according to the working conditions such as the walking speed of the coal mining machine, the hardness of coal and rock, and the stress of the drum, the rocker arm runs more stably, and the mining efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only for further understanding of the embodiments of the present application and constitute a part of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings. In the drawings: Fig. 1 is a structural schematic view of a rocker arm transmission device of a coal mining machine of the present application; Fig. 2 is a top view of a transmission chain in the rocker arm transmission device of the coal mining machine of the present application.

[0014] Explanation of reference signs: 1, permanent magnet motor; 2, first speed reducer; 3, input shaft; 4, first sprocket; 5, transmission chain; 6, second sprocket; 7, output shaft; 8, second speed reducer; 9, drum seat; 100, rocker arm shell; 101, first shell; 102, second shell. DETAILED DESCRIPTION

[0015] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0016] The present application provides a coal mining machine and a rocker arm transmission device and a rocker arm transmission method thereof. Figs. 1-2 As shown in the figure, the rocker arm transmission device of the coal mining machine comprises a rocker arm housing 100, a first housing 101 arranged at the bottom of one end of the rocker arm housing 100, a second housing 102 arranged at the top of the other end of the rocker arm housing 100, and a control unit arranged in the coal mining machine for realizing speed control and operation adaptation. The overall layout of the rocker arm housing 100 ensures that the power transmission path is the shortest and the center of gravity is balanced. The first sprocket 4 is arranged inside one end of the rocker arm housing 100 through a bearing seat, and the second sprocket 6 is arranged inside the other end of the rocker arm housing 100 through a bearing seat. The first sprocket 4 and the second sprocket 6 are arranged in the length direction of the rocker arm housing 100 with their center axes parallel and height adapted to the tensioning requirement of the transmission chain 5. The transmission chain 5 is arranged between the first sprocket 4 and the second sprocket 6 and is meshed and connected to the outer periphery of the first sprocket 4 and the outer periphery of the second sprocket 6, respectively, to form a complete flexible transmission mechanism. The transmission chain 5 is arranged in the rocker arm housing 100. The first housing 101 is provided with a first speed reducer 2. The first speed reducer 2 is connected with a permanent magnet motor 1 through a transmission shaft below. The first speed reducer 2 is connected to the center shaft of the first sprocket 4 through an input shaft 3. The permanent magnet motor 1 is connected to the control unit. More specifically, the permanent magnet motor 1 and the control unit are connected through wires to establish an electrical signal connection and receive the speed regulation instruction output by the control unit. The second housing 102 is provided with a second speed reducer 8. The second speed reducer 8 is connected with a drum (not shown in the figure) through a drum seat 9 above. The second speed reducer 8 is connected to the center shaft of the second sprocket 6 through an output shaft 7.

[0017] Further, in the rocker arm transmission device of the coal mining machine of the present application, the permanent magnet motor 1 cooperates with the first speed reducer 2 and the second speed reducer 8 to form an integrated permanent magnet motor speed reducer.

[0018] As a specific embodiment, in the rocker arm transmission device of the coal mining machine of the present application, the first speed reducer 2 and the second speed reducer 8 both adopt planetary speed reducers. The tooth number ratio of the sun gear, the planet gear and the inner ring gear is adapted to the torque amplification requirement, and the structure specifications of the two are designed differently according to the power requirement difference of drum cutting and coal loading.

[0019] As a specific embodiment, in the rocker arm transmission device of the coal mining machine, the permanent magnet motor 1 adopts an internal permanent magnet synchronous motor, the magnetic field structure design of the stator and the rotor ensures low-speed large torque output, the motor shell is fixed on the bottom of the first shell 101 through bolts, the installation position is close to the connecting lug of the rocker arm and the machine body, the mass center of the rocker arm is offset to the machine body, and the anti-vibration performance and stability during lifting operation are improved.

[0020] As a specific embodiment, in the rocker arm transmission device of the coal mining machine, the transmission chain 5 adopts a roller chain, the meshing gap between the chain links and the sprocket teeth is accurately designed, even if the rocker arm shell 100 is slightly deformed during operation, the roller chain can still compensate the deformation amount through its flexibility, and the problems of traditional gear transmission such as jamming or tooth surface wear are avoided.

[0021] The rocker arm transmission method of the coal mining machine is implemented by using the above-mentioned rocker arm transmission device, and specifically includes the following steps: Step 1: start the permanent magnet motor 1 through the control unit, the output end of the permanent magnet motor 1 drives the first speed reducer 2 through the transmission shaft, and the output end of the first speed reducer 2 drives the first sprocket 4 to rotate through the input shaft 3; Step 2: since the first sprocket 4 is matched with the transmission chain 5, the transmission chain 5 in turn drives the second sprocket 6 to rotate synchronously; Step 3: the second sprocket 6 drives the second speed reducer 8 through the output shaft 7, and the output end of the second speed reducer 8 drives the roller drum seat 9 to provide power for the roller operation.

[0022] As a specific embodiment, in the rocker arm transmission method of the coal mining machine, for a double-drum coal mining machine, a set of independent rocker arm transmission devices are respectively arranged on the front drum and the rear drum, and the control unit can send different speed instructions to the two sets of permanent magnet motors 1 respectively, so that the cutting speed of the front drum and the coal loading speed of the rear drum are independently adjusted. On the other hand, the application also provides a coal mining machine, which comprises the above-mentioned rocker arm transmission device.

[0023] In summary, compared with the prior art, the coal mining machine and the rocker arm transmission device and the rocker arm transmission method thereof have the following advantages and positive effects: (1) The permanent magnet motor 1 is used to replace the traditional asynchronous motor, the straight-tooth transmission gear is omitted, the mechanical transmission distance is shortened, the problems of poor lubrication, cooling, cutting capacity and power saving performance of the traditional rocker arm are solved, the system mechanical failure rate is reduced, and the production efficiency is improved, and since the permanent magnet motor 1 has a simple structure, the internal structure of the rocker arm is simplified, and the maintenance complexity is reduced; (2) The flexible transmission of the roller chain transmission system in the application effectively solves the transmission failure problem caused by the deformation of the rocker arm shell 100, has compact structure, convenient operation and strong practicability, avoids the gear wear problem, has small operation noise, further avoids the frequent maintenance work of replacing lubricating oil, and for the double-drum coal mining machine, the rotation speeds of front and rear drums can be adjusted through the control unit respectively, the front drum focuses on cutting coal and rock, the rear drum high-speed loads coal, and the coal loading efficiency is further improved; (3) The built-in permanent magnet synchronous motor is adopted in the application to reduce the output speed, shorten the transmission chain 5, reduce the shell volume at the output shaft 7, the optimization of the motor installation position makes the mass center of the rocker arm close to the fuselage, enhances the operation stability, the motor supports variable frequency speed regulation, the rotation speed can be accurately adjusted according to the working conditions such as the walking speed of the coal mining machine, the hardness of coal and rock and the stress of the drum, the rocker arm runs more stably, and the mining efficiency is improved.

[0024] It should be noted that in this paper, unless otherwise specified and limited, the term "connection" or its synonyms should be broadly understood, for example, "connection" can be fixed connection, can also be detachable connection, can be mechanical connection, can also be electrical connection, can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements, and those skilled in the art can understand the specific meaning of the above-mentioned term in the application according to the specific situation. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. At the same time, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. In addition, "front", "back", "left", "right", "up", "down" in this paper are referred to the placement state shown in the drawings.

[0025] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A rocker arm transmission device for a coal mining machine, characterized in that, The machine includes a rocker arm housing, a first housing disposed at the bottom of one end of the rocker arm housing, a second housing disposed at the top of the other end of the rocker arm housing, and a control unit disposed within the coal mining machine, wherein: A first sprocket is provided inside one end of the rocker arm housing, and a second sprocket is provided inside the other end. A transmission chain is provided between the first sprocket and the second sprocket. The transmission chain is respectively meshed with the outer circumference of the first sprocket and the outer circumference of the second sprocket. The transmission chain is located inside the rocker arm housing. The first housing is provided with a first reduction device, and a permanent magnet motor is connected to the first reduction device via a drive shaft. The first reduction device is connected to the first sprocket via an input shaft, and the permanent magnet motor is connected to the control unit. The second housing contains a second speed reduction device, and a roller is connected above the second speed reduction device via a roller seat. The second speed reduction device is connected to the second sprocket via an output shaft.

2. The rocker arm transmission device of the coal mining machine according to claim 1, characterized in that, The permanent magnet motor is combined with the first reduction device and the second reduction device to form an integrated permanent magnet motor reducer.

3. The rocker arm transmission device of the coal mining machine according to claim 1, characterized in that, Both the first and second deceleration devices are planetary deceleration devices.

4. The rocker arm transmission device of the coal mining machine according to claim 1, characterized in that, The permanent magnet motor is an internal permanent magnet synchronous motor.

5. The rocker arm transmission device of the coal mining machine according to claim 1, characterized in that, The drive chain is a roller chain.

6. A method for driving the rocker arm of a coal mining machine, wherein the method is implemented using the rocker arm drive device as described in any one of claims 1 to 5, comprising: Step 1: Start the permanent magnet motor through the control unit. The output of the permanent magnet motor drives the first reduction device through the transmission shaft. The output of the first reduction device drives the first sprocket to rotate through the input shaft. Step 2: Since the teeth of the first sprocket engage with the transmission chain, the transmission chain then drives the second sprocket to rotate synchronously; Step 3: The second sprocket drives the second reduction gear through the output shaft, and the output end of the second reduction gear provides power for the roller operation by driving the roller seat.

7. A coal mining machine, characterized in that, The coal mining machine includes the rocker arm transmission device according to any one of claims 1-5.

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