Compact power system for internally driven high speed ratio pumps

Abstract

The present invention relates to a compact power system for a high-speed ratio pump driven by internal power, comprising a two-stage series planetary speed-increasing mechanism and a one-stage fixed-axis gear speed-increasing mechanism connected in sequence, the power input end and the power output end of the two-stage series planetary speed-increasing mechanism are respectively the planet carrier of the first-stage planetary mechanism and the sun gear of the second-stage planetary mechanism, the power input end and the power output end of the one-stage fixed-axis gear speed-increasing mechanism are respectively the head gear and the end gear, the planet carrier of the first-stage planetary mechanism is spline-connected with a fixed-axis gear in the main transmission system, the sun gear of the second-stage planetary mechanism is spline-connected with the head gear, and the core of the end gear is provided with a gear pump transmission shaft mounting interface structure. 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 power system for a high-speed ratio pump driven by internal power, which is suitable for thin or extremely thin coal seam shearers, especially thin or extremely thin coal seam shearers 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 power system for a high-speed ratio pump driven by internal power, whose power comes from a cutting transmission system, has a compact structure, stable speed, and can meet the overall layout requirements of a thin or ultra-thin coal seam coal mining machine with a suspended body structure.

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

[0006] A compact power system for a high-speed ratio pump driven by internal power, comprising a two-stage series 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 two-stage series planetary speed-increasing mechanism being respectively a planet carrier of the first-stage planetary mechanism and a sun gear of the second-stage planetary mechanism, the power input end and the power output end of the first-stage fixed-axis gear speed-increasing mechanism being respectively a head gear and a terminal gear, the planet carrier of the first-stage planetary mechanism being spline-connected to a fixed-axis gear in the main transmission system, the sun gear of the second-stage planetary mechanism being spline-connected to the head gear, and the core of the terminal gear being provided with a gear pump transmission shaft mounting interface structure.

[0007] The rear end of the planetary carrier of the first-stage planetary mechanism may be provided with an external spline, which cooperates with the internal spline provided at one end of the fixed axis gear to form a spline connection, and the output end of the sun gear of the second-stage planetary mechanism may be provided with an external spline, which cooperates with the internal spline provided at the core of the head end gear to form a spline connection.

[0008] The gear pump transmission shaft mounting interface structure may include an internal spline disposed at a core portion of an output end of the final gear.

[0009] The compact power system for a high-speed ratio pump driven by internal power also includes a bracket for mounting the fixed-axis gear, the bracket is provided with a gear mounting through hole, the front end of the fixed-axis gear is rotatably supported in the gear mounting through hole, the front end of the fixed-axis gear is provided with two-step grooves with a larger front and a smaller rear, the inner gear ring of the first-stage planetary mechanism is installed in the front groove, and the rear end of the planetary carrier of the first-stage planetary mechanism is arranged as an external spline, which cooperates with the internal spline arranged in the rear groove to form a spline connection.

[0010] The compact power system for a high-speed ratio pump driven by internal power also includes an end cover, which is fixed to the bracket from the front and closes the front end of the fixed-axis gear in the gear mounting through hole. The shape of the end cover is preferably a stepped shape with a larger front and a smaller rear. The front and rear parts of the end cover are respectively provided with a front chamber open in the front and a rear chamber open in the rear, and the front and rear chambers are communicated with each other. The rear part of the end cover is inserted into the front groove of the fixed-axis gear, and is overlapped and fixedly connected with the inner gear ring of the first-stage planetary mechanism front and back. The main body of the second-stage planetary mechanism is installed in the rear chamber of the end cover, and the rear part of the end cover is provided with an internal gear. The rear part of the end cover serves as the inner gear ring of the second-stage planetary mechanism with the help of the internal gear. The first-stage fixed-axis gear speed increasing mechanism is installed in the front chamber of the end cover, and the output end of the sun gear of the second-stage planetary mechanism extends forward into the core of the first gear and is splined with it.

[0011] The rear portion of the end cover and the inner gear ring of the first-stage planetary mechanism are preferably positioned by means of a circular stop and a plurality of positioning pins.

[0012] The beneficial effects of the present invention are:

[0013] The fixed-axis gear is the starting point of the compact power system for the pump, which leads to a power output branch from the main transmission system, which provides "internal power" to the gear pump, so there is no need to equip the gear pump with an external power source separately.

[0014] The compact power system for the pump can re-accelerate a certain node after the main transmission system is decelerated, and can eventually increase the speed of the gear pump to the required speed, thereby achieving the normal working state of the gear pump.

[0015] The use of the two-stage series planetary speed increasing mechanism can achieve a larger speed increasing ratio with a smaller space occupation, which is beneficial to saving installation space and making the system more compact.

[0016] Since the two-stage series planetary speed increasing mechanism is arranged in the groove of the fixed axis gear, and the one-stage fixed axis gear speed increasing mechanism is arranged in the front chamber of the end cover, the installation space of the compact pump power system is further saved, especially the axial space occupation is reduced. The gear pump power system realizes a compact setting. When the hydraulic system and the height adjustment cylinder share a chamber, the compact setting can ensure that the height adjustment cylinder has sufficient setting space in the front and rear directions. Therefore, the compact setting also makes the gear pump power system suitable for thin or ultra-thin coal seam shearers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Structural details of the illustrated embodiment;

[0019] Figure 3 is a schematic diagram of the local structure of the fixed axis gear;

[0020] Figure 4 is a structural schematic diagram of an embodiment of the end cover;

[0021] Figure 5 The figure is a schematic diagram of an arrangement of the compact pump power system when applied to a coal mining machine.

[0022] Reference numerals:

[0023] 1. Compact power system for high-speed ratio pump driven by internal power; 11. Two-stage series planetary speed increasing mechanism; 111. Planet carrier of the first-stage planetary mechanism; 112. Sun gear of the first-stage planetary mechanism; 113. Internal gear ring of the first-stage planetary mechanism; 114. Planet carrier of the second-stage planetary mechanism; 115. Sun gear of the second-stage planetary mechanism; 12. One-stage fixed-axis gear speed increasing mechanism; 121. Head gear; 122. Idler gear; 123. End gear;

[0024] 2. Gear pump;

[0025] 3. Fixed axis gear; 31. Front groove; 32. Rear groove; 321. Internal spline;

[0026] 4. Bracket;

[0027] 5.Front bearing seat;

[0028] 6. End cover; 61. Front of end cover; 611. Outer cylindrical surface; 612. Rear end surface; 613. First mounting hole; 614. Second mounting hole; 615. Third mounting hole; 62. Rear of end cover; 621. Internal gear;

[0029] 7. Positioning pin;

[0030] 8. Small end cap;

[0031] 9. Raise the oil cylinder;

[0032] 10. Box; 101. Chamber. DETAILED DESCRIPTION

[0033] The present invention discloses a compact power system 1 for a pump with a high speed ratio driven by an internal power source (hereinafter referred to as a compact power system for a pump), which can be used to provide power for a gear pump 2 of a hydraulic system of a coal mining machine and can replace a conventional pump motor. Figure 1-5 As shown, the compact power system for pumps includes a two-stage series planetary speed increasing mechanism 11 and a one-stage fixed-axis gear speed increasing mechanism 12 which are sequentially connected in transmission. The power input end and the power output end of the two-stage series planetary speed increasing mechanism are respectively the planet carrier 111 of the first-stage planetary mechanism and the sun gear 115 of the second-stage planetary mechanism. The power input end and the power output end of the one-stage fixed-axis gear speed increasing mechanism are respectively the head gear 121 and the end gear 123. The planet carrier of the first-stage planetary mechanism is spline-connected with a fixed-axis gear 3 in the main transmission system. When used for a coal mining machine, the main transmission system is preferably a cutting transmission system of the coal mining machine, and the fixed-axis gear is preferably a gear in the middle section of the cutting transmission system. The fixed-axis gear is the starting point of the compact power system for pumps, and the compact power system for pumps draws out a power output branch from the main transmission system, which provides "internal power" to the gear pump, so it is no longer necessary to equip the gear pump with an external power source separately. The sun gear of the second-stage planetary mechanism is spline-connected with the head gear. The core of the terminal gear is provided with a gear pump transmission shaft mounting interface structure, and the output power of the compact power system for the pump is transmitted to the transmission shaft of the gear pump through the interface structure.

[0034] The cutting transmission system is a reduction transmission system. The compact pump power system can increase the speed of a certain node after deceleration, and finally increase the speed of the gear pump to the required speed to achieve the normal working state of the gear pump. The two-stage series planetary speed increase mechanism can achieve a larger speed increase ratio with a smaller space occupation, which is very helpful to save installation space and make the system more compact.

[0035] Regarding the above two spline connections, the specific structure can be: the rear end of the planet carrier of the first-stage planetary mechanism is provided with an external spline, and the external spline cooperates with the internal spline provided at one end of the fixed axis gear to form a spline connection; the output end of the sun gear of the second-stage planetary mechanism is provided with an external spline, and the external spline cooperates with the internal spline provided at the core of the head end gear to form a spline connection. The use of spline connection can further save axial installation space.

[0036] The gear pump transmission shaft mounting interface structure may include an internal spline disposed at a core portion of an output end of the terminal gear, for forming a spline connection with an external spline on an input end of the transmission shaft of the gear pump.

[0037] The compact power system for the pump also includes a bracket 4 for mounting the fixed axis gear, the bracket is provided with a gear mounting through hole, and the front end of the fixed axis gear is rotatably supported in the gear mounting through hole. In the embodiment shown in the accompanying drawings, the front end of the fixed axis gear is rotatably supported on the front bearing seat 5 through a bearing, and the front bearing seat is fixedly mounted in the gear mounting through hole. In the coal mining machine, the bracket can be a wall panel on a box 10 for accommodating the installation of the cutting transmission system or other structural parts fixedly connected to the side wall at that location (see Figure 5 ).

[0038] The front end of the fixed axis gear is preferably provided with two stepped grooves, the front larger and the rear smaller. The inner gear ring 113 of the first-stage planetary mechanism is installed in the front groove 31 and is located at the bottom of the groove. The rear end of the planet carrier 111 of the first-stage planetary mechanism is provided with an external spline, which cooperates with the internal spline 321 provided in the rear groove 32 to form a spline connection. When the fixed axis gear rotates, the internal spline in the rear groove also rotates synchronously, and the internal spline drives the planet carrier of the first-stage planetary mechanism to rotate, thereby realizing the power input to the first-stage planetary mechanism. In order to facilitate processing, an empty tool groove is also provided behind the internal spline in the rear groove.

[0039] Furthermore, the compact power system for pumps also includes an end cover 6, which is fixed to the bracket from the front and closes the front end of the fixed axis gear in the gear mounting through hole. The shape of the end cover is preferably a stepped shape with a larger front and a smaller rear. The front part 61 and the rear part 62 of the end cover are respectively provided with a front chamber open in the front and a rear chamber open in the rear, and the front and rear chambers are connected. The rear part of the end cover is inserted into the front groove 31 of the fixed axis gear, and is stacked and fixedly connected with the inner gear ring 113 of the first-stage planetary mechanism. The main body of the second-stage planetary mechanism is installed in the rear chamber of the end cover, and the rear part of the end cover is provided with an internal gear 621, and the rear part of the end cover acts as the inner gear ring of the second-stage planetary mechanism by means of the internal gear. It can be seen that the second-stage planetary mechanism is also arranged in the front groove of the fixed axis gear, which significantly saves the axial installation space. The first-stage fixed-axis gear speed increasing mechanism 12 is installed in the front chamber of the end cover, and the output end of the sun gear 115 of the second-stage planetary mechanism extends forward through the connection between the front and rear chambers into the core of the first gear 121 and is spline-connected therewith.

[0040] Since the two-stage series planetary speed increasing mechanism is arranged in the groove of the fixed axis gear, and the one-stage fixed axis gear speed increasing mechanism is arranged in the front chamber of the end cover, the installation space of the compact pump power system is further saved, especially the axial space occupation is reduced. The gear pump power system realizes a compact arrangement, such as Figure 5 As shown, when the hydraulic system shares the chamber 101 with the height adjustment cylinder 9, the compact arrangement can ensure that the height adjustment cylinder has sufficient arrangement space in the front and rear directions. The compact arrangement also enables the gear pump power system to be suitable for thin or ultra-thin coal seam shearers.

[0041] The rear portion 62 of the end cover and the inner gear ring 113 of the first-stage planetary mechanism are preferably positioned by a circular stop and a plurality of positioning pins 7 and fixedly connected by screws.

[0042] The front portion 61 of the end cover may be provided with an outer flange structure, and the front outer cylindrical surface 611 of the end cover and the rear end surface 612 of the outer flange structure are the positioning surfaces when the end cover is installed. When the front bearing seat is present, the end cover is positioned and installed on the front bearing seat. A seal is also provided between the cylindrical matching positioning surfaces between the end cover and the front bearing seat. The other surfaces of the end cover do not contact the fixed axis gear.

[0043] An idler gear 122 may be further provided between the head gear and the tail gear, and the idler gear is externally meshed with the head gear and the tail gear.

[0044] Correspondingly, the front part of the end cover is provided with three mutually parallel mounting holes, namely the first mounting hole 613, the second mounting hole 614 and the third mounting hole 615, and the head gear, the idler gear and the end gear are respectively located in the first, second and third mounting holes. The idler gear is rotatably supported on the idler shaft through a bearing, and both ends of the idler shaft are fixedly mounted on the end cover. When the gear pump is installed, the gear pump will be located on the front end surface of the end cover facing the third mounting hole.

[0045] A small end cover 8 is fixedly mounted on the front end surface of the end cover facing the first mounting hole, and the small end cover closes the first mounting hole from the front. In this embodiment, the small end cover also serves as the front end bearing seat of the head end gear.

[0046] In the embodiment shown in the accompanying drawings, the sun gear 112 of the first-stage planetary mechanism is spline-connected with the planet carrier 114 of the second-stage planetary mechanism. Specifically, an external spline is provided at the output end of the sun gear of the first-stage planetary mechanism, and the external spline cooperates with the internal spline provided at the core of the planet carrier of the second-stage planetary mechanism to form a spline connection.

[0047] The terms "front" and "back" in this article indicate relative position relationships, not limitations on absolute positions.

Claims

1. A compact power system for a high-speed ratio pump driven by an internal power, characterized in that: It includes a two-stage series planetary speed-increasing mechanism and a one-stage fixed-axis gear speed-increasing mechanism which are sequentially connected in transmission, the power input end and the power output end of the two-stage series planetary speed-increasing mechanism are respectively the planetary carrier of the first-stage planetary mechanism and the sun gear of the second-stage planetary mechanism, the power input end and the power output end of the one-stage fixed-axis gear speed-increasing mechanism are respectively the head gear and the terminal gear, the planetary carrier of the first-stage planetary mechanism is spline-connected with a fixed-axis gear in the main transmission system, the sun gear of the second-stage planetary mechanism is spline-connected with the head gear, and the core of the terminal gear is provided with a gear pump transmission shaft mounting interface structure; it also includes an end cover and a bracket for mounting the fixed-axis gear, the bracket is provided with a gear mounting through hole, the front end of the fixed-axis gear is rotatably supported in the gear mounting through hole, the front end of the fixed-axis gear is provided with two stepped grooves with a larger front and a smaller rear, the inner gear ring of the first-stage planetary mechanism is installed in the front groove, and the rear end of the planetary carrier of the first-stage planetary mechanism is provided with a gear pump transmission shaft mounting interface structure. The gear wheel is connected with the gear of the first stage planetary mechanism by a forward movement of the end cap, and the rear end of the sun gear of the second stage planetary mechanism is connected with the gear wheel of the first stage planetary mechanism through the front end of the sun gear.

2. The compact power system for a high-speed ratio pump driven by an internal power as claimed in claim 1, characterized in that: The gear pump transmission shaft mounting interface structure includes an internal spline arranged at the core of the output end of the terminal gear.

3. The compact power system for a high-speed ratio pump driven by internal power as claimed in claim 1 or 2, characterized in that: The rear portion of the end cover is positioned with the inner gear ring of the first-stage planetary mechanism through a circular stop and a plurality of positioning pins.

4. The compact power system for a high-speed ratio pump driven by an internal power as claimed in claim 3, characterized in that: 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.

5. The compact power system for a high-speed ratio pump driven by an internal power as claimed in claim 4, characterized in that: The front part of the end cover is provided with three parallel mounting holes, namely the first mounting hole, the second mounting hole and the third mounting hole. The head end gear, the idler gear and the end gear are respectively located in the first, second and third mounting holes.

6. The compact power system for a high-speed ratio pump driven by an internal power as claimed in claim 5, characterized in that: A small end cover is fixedly mounted on the front end surface of the end cover, and the small end cover closes the first mounting hole from the front.

7. The compact power system for a high-speed ratio pump driven by an internal power as claimed in claim 1 or 2, characterized in that: The sun gear of the first-stage planetary mechanism is spline-connected with the planet carrier of the second-stage planetary mechanism.

8. The compact power system for a high-speed ratio pump driven by an internal power as claimed in claim 3, characterized in that: The sun gear of the first-stage planetary mechanism is spline-connected with the planet carrier of the second-stage planetary mechanism.

9. The compact power system for a high-speed ratio pump driven by an internal power as claimed in claim 4, characterized in that: The sun gear of the first-stage planetary mechanism is spline-connected with the planet carrier of the second-stage planetary mechanism.

10. The compact power system for a high-speed ratio pump driven by an internal power as claimed in claim 5, characterized in that: The sun gear of the first-stage planetary mechanism is spline-connected with the planet carrier of the second-stage planetary mechanism.

11. The compact power system for a high-speed ratio pump driven by an internal power as claimed in claim 6, characterized in that: The sun gear of the first-stage planetary mechanism is spline-connected with the planet carrier of the second-stage planetary mechanism.

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