Compact gear pump power system with internal power

Abstract

The present invention relates to a compact gear pump power system with internal power, including a first-stage planetary speed increasing mechanism and a first-stage fixed-axis gear speed increasing mechanism which are sequentially connected in transmission, the power input end and the power output end of the first-stage planetary speed increasing mechanism are respectively a planet carrier and a sun gear, the sun gear of the first-stage planetary speed increasing mechanism is coaxially splined with the head gear of the first-stage fixed-axis gear speed increasing mechanism, the terminal gear of the first-stage fixed-axis gear speed increasing mechanism is provided with a gear pump transmission shaft mounting interface structure, and one axial end of the planet carrier of the first-stage planetary speed increasing mechanism is splined with one end of the output gear of the middle section of the cutting transmission system. The power of the present invention comes from the cutting transmission system, has a compact structure, stable speed, and can meet the overall layout requirements of thin or ultra-thin coal seam coal mining machines with suspended fuselage structures.

Description

Technical Field

[0001] The invention relates to a compact gear pump power system with internal power, which is suitable for thin or extremely thin coal seam coal mining machines, especially thin or extremely thin coal seam coal mining machines with a suspended body structure. Background Art

[0002] Coal mining machines usually use a separate pump motor as the power source of the hydraulic system. The pump motor and valve group are installed in an independent oil tank to form an independent hydraulic system. However, in order to improve the adaptability of the coal mining machine to the roof, floor and mining environment, the span between the left and right rollers needs to be shortened as much as possible for extremely thin coal seam coal mining machines, especially those with a suspended body structure. If an independent hydraulic system is still set up in the traditional way, it may not be achieved, or it may affect the layout of the overall structure of the coal mining machine, such as making it difficult to layout other components, and also reducing the adaptability of the coal mining machine.

[0003] There are also power systems in the industry that use the main transmission system to provide power for the gear pump in an independent oil tank. On the one hand, the gear pump is connected to the pipeline and installed in the oil tank, which is easy to contaminate the oil during maintenance and disassembly. On the other hand, due to the different speed ratio settings of the main transmission system, the speed output to the gear pump may be too high or too low, which is uncertain and may not meet the input speed requirements of the gear pump, nor may it meet the requirements of compact space layout. Summary of the invention

[0004] The present invention aims to provide a compact gear pump power system with internal power, whose power comes from the cutting transmission system, has a compact structure, stable speed, and can meet the overall layout requirements of thin or ultra-thin coal seam coal mining machines with suspended body structures.

[0005] The main technical solutions of the present invention are:

[0006] A compact gear pump power system with internal power includes a first-stage planetary speed increasing mechanism and a first-stage fixed-axis gear speed increasing mechanism which are sequentially connected in transmission, the power input end and the power output end of the first-stage planetary speed increasing mechanism are respectively a planet carrier and a sun gear, the sun gear of the first-stage planetary speed increasing mechanism is coaxially spline-connected with the head end gear of the first-stage fixed-axis gear speed increasing mechanism, the terminal gear of the first-stage fixed-axis gear speed increasing mechanism is provided with a gear pump drive shaft mounting interface structure, and one axial end of the planet carrier of the first-stage planetary speed increasing mechanism is spline-connected with one end of the output gear of the middle section of the cutting transmission system.

[0007] An external spline may be provided at one axial end of the planet carrier of the first-stage planetary speed increasing mechanism, and the external spline cooperates with an internal spline provided at one end of the output gear of the middle section of the cutting transmission system to form a spline connection.

[0008] The output end of the sun gear is preferably provided with an external spline, which is matched with the internal spline arranged in the core of the first-end gear.

[0009] The front and rear ends of the output gear can be respectively rotatably supported on the front and rear side walls in the fixed reduction gearbox housing. The front end of the output gear is provided with two stepped grooves that are larger at the front and smaller at the rear. The inner spline is arranged at the groove closer to the rear. The rear end of the planet carrier of the first-stage planetary speed increasing mechanism is provided with the external spline. The rear end of the planet carrier is located in the groove closer to the rear and is matched with the internal spline to form a spline connection.

[0010] The compact gear pump power system with internal power preferably further includes an end cover. The end cover is fixed relative to the fixed reduction gearbox housing. The rear part of the end cover is inserted into the groove closer to the front of the output gear. The main body of the first-stage planetary speed increasing mechanism is installed in the inner cavity at the rear part of the end cover. The rear part of the end cover serves as the internal gear ring of the first-stage planetary speed increasing mechanism. The first-stage fixed-axis gear speed increasing mechanism is installed in the inner cavity at the front part of the end cover. The output end of the sun gear extends forward into the inner cavity at the front part of the end cover and is coaxially spline-connected with the first-end gear.

[0011] The compact gear pump power system with internal power further includes a gear pump. The gear pump drive shaft installation interface structure includes an internal spline arranged in the core of the output end of the last-end gear. The gear pump is installed on the front end face of the end cover. The external spline is arranged on the drive shaft of the gear pump. The drive shaft of the gear pump is coaxially spline-connected with the last-end gear backward.

[0012] The front part of the end cover and the gear pump are located in the same chamber among multiple chambers in the fixed reduction gearbox housing.

[0013] The chamber where the front part of the end cover and the gear pump are located is also the oil cylinder installation chamber.

[0014] The cutting drive system includes a motor, a planetary reduction mechanism and a fixed-axis gear reduction mechanism. The number of poles of the motor is preferably 6 or 8. The output gear is located in the middle of the fixed-axis gear reduction mechanism.

[0015] The beneficial effects of the present invention are:

[0016] In the present invention, a power output branch is led out from the cutting drive system with the output gear as the node, and this power output branch is transmitted to the gear pump through the gear pump power system. Therefore, there is no need to separately equip an external power source for the gear pump.

[0017] Adopting the first-stage planetary speed increasing mechanism can achieve a large speed ratio with a small space occupation, which is not only beneficial to saving the installation space, but also easier to achieve the matching with the cutting drive system adopting a multi-pole motor.

[0018] Two stepped grooves with a larger front and a smaller rear are provided at the front end of the output gear. The rear part of the end cover is inserted into the front groove of the output gear, and at the same time, the main body of the first-stage planetary speed increasing mechanism is installed in the inner cavity at the rear part of the end cover. It is equivalent to setting the first-stage planetary speed increasing mechanism as a whole in the front groove of the output gear, significantly saving the axial installation space.

[0019] The first-stage fixed-axis gear speed increasing mechanism is installed in the inner cavity at the front part of the end cover, further saving the installation space of the gear pump power system, especially reducing the axial space occupation. Therefore, the structure of the gear pump power system is quite compact and is particularly suitable for shearers in thin or extremely thin coal seams.

[0020] Since the gear pump and its power system are installed in a cavity and are separated from the fuel tank, when maintaining the gear pump and its power system, the oil in the fuel tank will not be contaminated.

[0021] The cutting transmission system is located behind the oil cylinder, the gear pump and the gear pump power system. Compared with the layout method where it is located in front of the cutting transmission system, since the heavier components in the cutting transmission system are closer to the gob side, the overall center of gravity of the shearer can be shifted towards the gob side, and the center of gravity is closer to the position of the support leg (or scraper plate) than that of the shearer with a traditional structure, improving the stability of the shearer in both the stationary state and the walking state.

[0022] The motor has a relatively large number of poles, which can achieve a lower motor output speed. Correspondingly, the designed reduction ratios of the planetary reduction mechanism and the fixed-axis gear reduction mechanism can be smaller, which helps to realize the miniaturization and light weight of the planetary reduction mechanism and the fixed-axis gear reduction mechanism. Brief Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0024] Figure 2 It is a partial structural schematic diagram of the output gear;

[0025] Figure 3 It is a schematic structural diagram of an embodiment of the end cover;

[0026] Figure 4 It is a schematic diagram of a layout method of the gear pump power system in the fixed reduction gear housing of the shearer.

[0027] Reference Signs:

[0028] 11. Planet carrier; 12. Sun gear;

[0029] 21. First end gear; 22. Final end gear; 23. Idle gear;

[0030] 3. Gear pump;

[0031] 4. Fixed-axis gear reduction mechanism; 41. Output gear; 411. Rear groove; 412. Front groove;

[0032] 5. End cover; 51. Rear part of end cover; 52. Front part of end cover; 53. Annular end surface; 54. Cylindrical surface;

[0033] 6.Fix the reducer housing; 61.Cylinder installation cavity;

[0034] 7. Motor;

[0035] 8. Planetary reduction mechanism;

[0036] 9. Small end cap. DETAILED DESCRIPTION

[0037] The present invention discloses a compact gear pump power system with internal power (hereinafter referred to as a gear pump power system) for providing power for the gear pump of the hydraulic system of a coal mining machine, which can replace the traditional pump motor. Figures 1-4 As shown, the gear pump power system includes a first-stage planetary speed increasing mechanism and a first-stage fixed-axis gear speed increasing mechanism which are sequentially connected in transmission. The power input end and the power output end of the first-stage planetary speed increasing mechanism are respectively a planet carrier 11 and a sun gear 12. The sun gear 12 of the first-stage planetary speed increasing mechanism is coaxially spline-connected with the head end gear 21 of the first-stage fixed-axis gear speed increasing mechanism. The end gear 22 of the first-stage fixed-axis gear speed increasing mechanism is provided with a gear pump transmission shaft mounting interface structure. One axial end of the planet carrier of the first-stage planetary speed increasing mechanism is spline-connected with one end of the output gear 41 of the middle section of the cutting transmission system of the coal mining machine. The present invention uses the output gear as a node to draw out a power output branch from the cutting transmission system, and transmits the power output branch to the gear pump through the gear pump power system, so there is no need to separately equip the gear pump with an external power source.

[0038] The cutting transmission system is a reduction transmission system, which uses the gear pump power system to re-increase the speed of a certain node after deceleration, and finally increases the speed of the gear pump to the required speed to achieve the normal working state of the gear pump. The use of the first-level planetary speed increase mechanism can achieve a larger speed increase ratio with a smaller space occupation, which is not only conducive to saving installation space, but also easier to achieve matching with the cutting transmission system using a multi-pole motor.

[0039] One end of the planet carrier of the first-stage planetary speed increasing mechanism in the axial direction may be provided with an external spline, which is engaged with the internal spline provided at one end of the output gear in the middle section of the cutting transmission system, so as to realize the transmission of power from the output gear of the cutting transmission system to the first-stage planetary speed increasing mechanism.

[0040] An idle gear 23 may also be provided between the head gear and the tail gear, and the idle gear is externally meshed with both the head gear and the tail gear.

[0041] In the embodiment shown in the attached drawings, an external spline is provided at the output end of the sun gear 12, which is engaged with the internal spline provided in the core of the head gear 21, so as to realize the transmission of power from the first-stage planetary speed increasing mechanism to the first-stage fixed-axis gear speed increasing mechanism.

[0042] The front and rear ends of the output gear 41 are respectively rotatably supported on the front and rear side walls inside the fixed reduction gear housing 6. The fixed reduction gear housing is the main structural member for accommodating and installing the cutting transmission system. The front and rear side walls are two adjacent side walls among the multiple side walls inside the fixed reduction gear housing, and each side wall can divide the inner cavity of the fixed reduction gear housing into multiple different cavities. In the attached drawings, the front and rear ends of the output gear are respectively rotatably supported on the front and rear bearing seats through bearings, and the front and rear bearing seats are respectively fixedly installed on the front and rear side walls inside the fixed reduction gear housing. The front end of the output gear is preferably provided with two stepped grooves with a large front and a small rear. An internal spline is provided at the rear groove 411. The rear end of the planet carrier of the first-stage planetary speed increasing mechanism is provided with the external spline. The rear end of the planet carrier extends backward into the rear groove and is engaged with the internal spline to form a spline connection. In order to facilitate processing, a relief groove is also provided behind the internal spline.

[0043] Furthermore, the gear pump power system further includes an end cover 5, which is fixedly connected to the reduction gearbox housing relatively. The end cover is located in front of the output gear and the front bearing housing, and is used to enclose the output gear from the front end axially, separating the output gear from the space in front of the front side wall. The rear part 51 of the end cover is inserted into the front groove 412 of the output gear, and the main body of the first-stage planetary speed increasing mechanism is installed in the inner cavity of the rear part of the end cover. It is equivalent to that the first-stage planetary speed increasing mechanism is entirely arranged in the front groove of the output gear 41, significantly saving the axial installation space. The rear inner cavity section of the rear part of the end cover is configured as an internal gear, that is, the rear part of the end cover serves as the internal gear ring of the first-stage planetary speed increasing mechanism. The first-stage fixed-axis gear speed increasing mechanism is installed in the inner cavity of the front part 52 of the end cover. The output end of the sun gear extends forward into the inner cavity of the front part of the end cover and is coaxially spline-connected with the first-end gear. Since the first-stage fixed-axis gear speed increasing mechanism is entirely arranged in the end cover, it further saves the installation space of the gear pump power system, especially reducing the axial space occupation. Therefore, the structure of the gear pump power system is quite compact and is particularly suitable for shearers in thin or extremely thin coal seams.

[0044] The gear pump power system further includes a gear pump 3. The gear pump drive shaft installation interface structure includes an internal spline provided at the core of the output end of the end gear 22. The gear pump is installed on the front end face of the end cover. An external spline is provided on the drive shaft of the gear pump. The drive shaft of the gear pump extends backward into the inner cavity of the front part of the end cover and is coaxially spline-connected with the end gear to realize the transmission of power from the first-stage fixed-axis gear speed increasing mechanism to the gear pump.

[0045] A stop structure with an open front can be provided on the front bearing housing for positioning the end cover. The matching positioning structure on the end cover includes an annular end face 53 and a cylindrical surface 54, both of which are provided on the front part of the end cover. Seals are provided between the cylindrical mating positioning surfaces between the end cover and the front bearing housing.

[0046] There are three inner cavities inside the end cover. The first-stage planetary speed increasing mechanism and the first-end gear are installed in the first inner cavity. An idler gear is installed in the second inner cavity. The end gear and the exposed drive shaft of the gear pump are installed in the third inner cavity. The first inner cavity runs through from front to back. A small end cover 9 is also installed on the front end face of the end cover to enclose the first inner cavity from the front, that is, to enclose the inner cavity of the end cover where the first-end gear is located. The gear pump encloses the second and third inner cavities from the front. The front end of the first-end gear is rotatably supported on the small end cover by a bearing, and the rear end is rotatably supported on the end cover by a bearing.

[0047] The front part 52 of the end cover and the gear pump 3 are located in the same chamber among multiple chambers within the fixed reduction gear housing. The chamber where the front part of the end cover and the gear pump are located is also the cylinder mounting chamber 61 for mounting the height-adjusting cylinder of the shearer. Since the gear pump and its power system are installed in a cavity and separated from the fuel tank, the oil in the fuel tank will not be contaminated during the maintenance operation of the gear pump and its power system.

[0048] The cutting transmission system is located behind the cylinder, the gear pump, and the gear pump power system. Compared with the arrangement where it is in front of the cutting transmission system, since the heavier components in the cutting transmission system are closer to the gob side, the overall center of gravity of the shearer can be shifted towards the gob side, and it is closer to the position of the support leg (or scraper plate) than that of the shearer with the traditional structure, thus improving the stability of the shearer in both the stationary state and the walking state.

[0049] The cutting transmission system includes a motor 7, a planetary reduction mechanism 8, and a fixed-axis gear reduction mechanism 4 connected in sequence. The number of poles of the motor is preferably 6 or 8, the output speed of the motor is relatively low, and the design reduction ratios of the planetary reduction mechanism and the fixed-axis gear reduction mechanism can be relatively small, which helps to achieve the miniaturization and light weight of the planetary reduction mechanism and the fixed-axis gear reduction mechanism. The output gear is located in the middle of the fixed-axis gear reduction mechanism.

[0050] In this article, the front and rear directions refer to the directions close to the coal wall side and the gob side respectively.

Claims

1. A compact gear pump power system with internal power, Features: The gearbox is a gearbox that is mounted on a plurality of wheels and has a plurality of gears that are coupled to the gearbox. The gearbox is a gearbox that is mounted on a plurality of wheels and has a plurality of gears that are coupled to the gearbox. The gearbox is a gearbox that is mounted on a plurality of wheels and has a plurality of gears that are coupled to the gearbox. The gearbox is a gearbox that is mounted on a plurality of wheels and has a plurality of gears that are coupled to the gearbox.

2. The compact gear pump power system with internal power as claimed in claim 1, Features: An external spline is provided at one axial end of the planet carrier of the first-stage planetary speed increasing mechanism, and the external spline matches with an internal spline provided at one end of the output gear of the middle section of the cutting transmission system.

3. The compact gear pump power system with internal power as claimed in claim 1, Features: An idler wheel is also arranged between the first end gear and the last end gear, and the idler wheel is externally meshed with the first end gear and the last end gear.

4. The compact gear pump power system with internal power as claimed in claim 1, Features: The output end of the sun gear is provided with an external spline, which matches with the internal spline provided on the core of the head end gear.

5. The compact gear pump power system with internal power as claimed in claim 2, Features: The front and rear ends of the output gear are respectively rotatably supported on the front and rear side walls of the fixed reduction box housing, the front end of the output gear is provided with two stepped grooves, the front larger and the rear smaller, the rear groove is provided with an internal spline, the rear end of the planetary carrier of the first-stage planetary speed increasing mechanism is provided with the external spline, the rear end of the planetary carrier is located in the rear groove and cooperates with the internal spline to form a spline connection.

6. The compact gear pump power system with internal power as claimed in claim 5, Features: It also includes a gear pump, the gear pump drive shaft mounting interface structure includes an internal spline arranged on the core of the output end of the terminal gear, the gear pump is installed on the front end surface of the end cover, and an external spline is arranged on the drive shaft of the gear pump. The drive shaft of the gear pump is rearwardly connected to the coaxial spline of the terminal gear.

7. The compact gear pump power system with internal power as claimed in claim 6, Features: The front portion of the end cover and the gear pump are located in the same chamber among the multiple chambers in the fixed reduction gearbox housing.

8. The compact gear pump power system with internal power as claimed in claim 7, Features: The front part of the end cover and the chamber where the gear pump is located are also the oil cylinder installation chambers.

9. The compact gear pump power system with internal power according to claim 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that: The cutting transmission system includes a motor, a planetary reduction mechanism and a fixed-axis gear reduction mechanism. The number of poles of the motor is 6 or 8, and the output gear is located in the middle of the fixed-axis gear reduction mechanism.

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