Hydraulic system of coal mining machine

Abstract

The hydraulic system of the coal mining machine comprises a hydraulic cavity, a pump motor assembly, a proportional multi-way valve assembly and a balance throttle valve assembly, the hydraulic cavity is provided with an opening, the pump motor assembly, the proportional multi-way valve assembly and the balance throttle valve assembly are sequentially connected, the pump motor assembly and the balance throttle valve assembly are installed in the hydraulic cavity, and the proportional multi-way valve assembly is connected with the hydraulic cavity. The proportional multi-way valve assembly is slidably connected to the inner wall of the hydraulic cavity so as to slide towards the opening. According to the proportional multi-way valve, the proportional multi-way valve assembly is connected with the inner wall of the hydraulic cavity in the sliding mode, so that the proportional multi-way valve assembly can slide towards the opening of the hydraulic cavity, the proportional multi-way valve assembly is closer to the outer side, manual control under unforeseen circumstances is facilitated, and maintenance and replacement work of corresponding parts is facilitated; the proportional multi-way valve can be smoothly disassembled without underground hoisting, the maintenance efficiency of the hydraulic system of the coal mining machine is improved, and the safety in the maintenance process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, and more specifically, to a shearer hydraulic system. Background Art

[0002] In the prior art, the maintenance of the hydraulic system of a shearer is relatively difficult. Usually, the proportional multi-way valve pipeline needs to be disassembled and removed from the main valve to carry out maintenance work, and usually hoisting is required underground in a coal mine to successfully complete the disassembly, which is time-consuming and laborious and has certain safety risks. Summary of the Utility Model

[0003] In view of this, the utility model aims to provide a shearer hydraulic system to solve the technical problem of difficult maintenance of the shearer hydraulic system in the prior art.

[0004] The utility model provides a shearer hydraulic system, including a hydraulic cavity, a pump motor assembly, a proportional multi-way valve assembly, and a balance throttle valve assembly. The hydraulic cavity has an opening. The pump motor assembly, the proportional multi-way valve assembly, and the balance throttle valve assembly are connected in sequence. The pump motor assembly and the balance throttle valve assembly are installed in the hydraulic cavity. The proportional multi-way valve assembly is slidably connected to the inner wall of the hydraulic cavity to slide towards the opening.

[0005] Further, a slider part is installed on the proportional multi-way valve assembly, and a slide rail part is installed on the inner wall of the bottom plate of the hydraulic cavity. The slider part is slidably connected to the slide rail part.

[0006] Further, a positioning part is also included. A plurality of positioning holes are provided on the slide rail part along the sliding direction. The positioning part is detachably connected to the positioning holes and at least partially extends out of the positioning holes to abut and limit the slider part.

[0007] Further, the slider part includes a slider backing plate and a slider body, and the slide rail part includes a slide rail base and a slide rail body. The proportional multi-way valve assembly is installed on the slider backing plate. The slider body is installed on the slider backing plate. The slide rail base is installed on the inner wall of the bottom plate of the hydraulic cavity. The slide rail body is installed on the slide rail base. The slider body is slidably connected to the slide rail body.

[0008] Further, a first limiting part and a second limiting part are respectively provided at two ends of the slide rail part. The first limiting part and the second limiting part are used for abutting and limiting the slider part.

[0009] Further, an oil suction filter assembly is also included. The oil suction filter assembly is installed in the hydraulic cavity and is respectively connected to the shearer oil tank and the pump motor assembly.

[0010] Further, it further includes a high-pressure filter assembly, which is installed on the inner wall of the top plate of the hydraulic chamber, and the high-pressure filter assembly is respectively connected to the pump motor assembly and the proportional multi-way valve assembly.

[0011] Further, it further includes a make-up oil motor pump assembly, which is installed in the hydraulic chamber and is used to be respectively connected to the shearer oil tank and the make-up oil barrel.

[0012] Further, it further includes a liquid level gauge, which is installed at one end of the front plate of the hydraulic chamber close to the opening, and the liquid level gauge is connected to the shearer oil tank.

[0013] Further, it further includes a pressure gauge assembly, which is installed at the front end of the hydraulic chamber, and the pressure gauge assembly is connected to the oil outlet of the pump motor assembly.

[0014] In the shearer hydraulic system of the present utility model, the pump motor assembly, the proportional multi-way valve assembly, and the balance throttle valve assembly are installed in the hydraulic chamber. The pump motor assembly pumps the hydraulic oil in the oil tank into the proportional multi-way valve assembly. The proportional multi-way valve assembly controls the oil flow rate in the hydraulic system. The proportional multi-way valve assembly is connected to the balance throttle valve assembly, and the corresponding functions of the balance valve and the throttle valve can be realized to control the flow and pressure of the oil, making the action control of the corresponding hydraulic actuators more precise. At the same time, the proportional multi-way valve assembly is slidably connected to the inner wall of the hydraulic chamber, so that the proportional multi-way valve assembly can be slid towards the opening of the hydraulic chamber, making the proportional multi-way valve assembly more outwards, which is convenient for manual operation in case of an accident and for the maintenance and replacement of the corresponding parts. The proportional multi-way valve can be smoothly disassembled without hoisting underground, improving the maintenance efficiency of the shearer hydraulic system and the safety during the maintenance process.

[0015] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. Description of the Drawings

[0016] In the accompanying drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The same reference numerals with alphabetic suffixes or different alphabetic suffixes may represent different instances of similar components. The drawings generally illustrate various embodiments by way of example and not limitation, and are used in conjunction with the specification and the claims to explain the disclosed embodiments. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be an exhaustive or exclusive embodiment of the device or method. The accompanying drawings described herein are used to provide a further understanding of the present utility model and form a part of this application. The illustrative embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0017] Figure 1 is a schematic structural diagram of the shearer hydraulic system provided by the present utility model;

[0018] Figure 2 is one of the schematic diagrams of the slider part and the slide rail part provided by the present utility model;

[0019] Figure 3 is the second schematic diagram of the slider part and the slide rail part provided by the present utility model.

[0020] Among them, the above-mentioned drawings include the following reference numerals:

[0021] 1, hydraulic cavity; 11, slide rail part; 111, positioning hole; 112, slide rail base; 113, slide rail body; 2, pump motor assembly; 3, proportional multi-way valve assembly; 31, slider part; 311, slider backing plate; 312, slider body; 4, balance throttle valve assembly; 5, oil suction filter assembly; 6, high-pressure filter assembly; 7, oil replenishing motor pump assembly; 71, oil replenishing filter assembly; 8, liquid level gauge; 9, pressure gauge assembly. Detailed Embodiments

[0022] Next, specific embodiments of the present utility model will be described in detail with reference to the accompanying drawings, but this is not a limitation of the present utility model.

[0023] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the above description should not be regarded as a limitation, but only as an example of the embodiments. Those skilled in the art will think of other modifications within the scope and spirit of the present utility model.

[0024] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present utility model are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] This specification may use the phrase "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", which may each refer to one or more of the same or different embodiments according to the present utility model.

[0026] The present utility model provides a shearer hydraulic system, which includes a hydraulic cavity 1, a pump motor assembly 2, a proportional multi-way valve assembly 3 and a balance throttle valve assembly 4. The hydraulic cavity 1 has an opening. The pump motor assembly 2, the proportional multi-way valve assembly 3 and the balance throttle valve assembly 4 are connected in sequence. The pump motor assembly 2 and the balance throttle valve assembly 4 are installed inside the hydraulic cavity 1, and the proportional multi-way valve assembly 3 is slidably connected to the inner wall of the hydraulic cavity 1 to slide towards the opening.

[0027] Combined with Figure 1 As shown, the hydraulic cavity 1 is generally in the shape of a cavity. The Z-axis with the positive direction representing above and the negative direction representing below, and the Y-axis with the positive direction representing the front and the negative direction representing the rear are shown in the figure. Correspondingly, the direction perpendicular to the drawing plane is the X-axis. From Figure 2 it can be seen that its positive and negative directions respectively represent both sides of the hydraulic cavity 1. In this embodiment, the opening of the hydraulic cavity 1 is provided on the side of the hydraulic cavity 1 along the reverse direction of the X-axis.

[0028] Combined with Figure 1As shown, the pump-motor assembly 2, the proportional multi-way valve assembly 3, and the balancing throttle valve assembly 4 are all installed in the hydraulic chamber 1. The inlet of the pump-motor assembly 2 is connected to the fuel tank. The pump-motor assembly 2 is composed of a motor and a hydraulic pump connected to each other. The outlet of the pump-motor assembly 2 is connected to the proportional multi-way valve assembly 3. Thus, the hydraulic oil can be pumped into the proportional multi-way valve assembly 3 by the hydraulic pump, and the oil flow in the hydraulic system can be controlled by the proportional multi-way valve assembly 3 to achieve precise control of the corresponding hydraulic actuators. Then, the proportional multi-way valve assembly 3 is connected to the balancing throttle valve assembly 4. The balancing throttle valve assembly 4 of the shearer hydraulic system usually includes a balance valve group and a throttle valve group for the top guard cylinder, and a balance valve group and a throttle valve group for the crusher cylinder. The balance valve group and the throttle valve group for the top guard cylinder are connected to the top guard cylinder of the shearer, and the flow and pressure of the oil are controlled by the balance valve and the throttle valve. The balance valve group and the throttle valve group for the crusher cylinder are connected to the crusher cylinder of the shearer, and the flow and pressure of the oil are controlled by the balance valve and the throttle valve, thereby realizing the actions of the corresponding hydraulic actuators.

[0029] Combined with Figure 1 As shown, the proportional multi-way valve assembly 3 is slidably connected to the inner wall of the hydraulic chamber 1. Structures such as a slide rail-slider structure, a guide sleeve-guide post structure, and a wheel set-rail structure can be adopted to achieve the slidable connection between the proportional multi-way valve assembly 3 and the inner wall of the hydraulic chamber 1. Its sliding direction is set towards the opening of the hydraulic chamber 1, so that the proportional multi-way valve assembly 3 can slide to a position close to the opening of the hydraulic chamber 1, that is, a position closer to the outside of the hydraulic chamber 1.

[0030] In the shearer hydraulic system of the present utility model, the pump-motor assembly 2, the proportional multi-way valve assembly 3, and the balancing throttle valve assembly 4 are installed in the hydraulic chamber 1. The hydraulic oil in the fuel tank is pumped into the proportional multi-way valve assembly 3 by the pump-motor assembly 2. The oil flow in the hydraulic system is controlled by the proportional multi-way valve assembly 3. The proportional multi-way valve assembly 3 is connected to the balancing throttle valve assembly 4, and the corresponding functions of the balance valve and the throttle valve can be realized to control the flow and pressure of the oil, making the action control of the corresponding hydraulic actuators more precise. At the same time, the proportional multi-way valve assembly 3 is slidably connected to the inner wall of the hydraulic chamber 1, so that the proportional multi-way valve assembly 3 can be slid towards the opening of the hydraulic chamber 1, making the proportional multi-way valve assembly 3 closer to the outside. This is convenient for manual operation in case of an accident and for the repair and replacement of the corresponding parts. The proportional multi-way valve can be smoothly disassembled without hoisting underground, improving the maintenance efficiency of the shearer hydraulic system and the safety during the maintenance process.

[0031] Further, a slider part 31 is installed on the proportional multi-way valve assembly 3, and a slide rail part 11 is installed on the inner wall of the bottom plate of the hydraulic chamber 1. The slider part 31 is slidably connected to the slide rail part 11.

[0032] Combined with Figures 1 to 3As shown, the proportional multi-way valve assembly 3 is slidably connected to the slide rail portion 11 on the inner wall of the bottom plate of the hydraulic chamber 1 (i.e., the side plate on the side opposite to the Z-axis direction in the figure) through the slider portion 31. The specific dimensions and extension directions (i.e., sliding directions) of the slider portion 31 and the slide rail portion 11 can be designed as needed. Generally speaking, the slide rail portion 11 can extend to the opening edge of the hydraulic chamber 1 or continue to extend a certain distance outside the hydraulic chamber 1, so that the slider portion 31 can drive the proportional multi-way valve assembly 3 to slide to a position closer to the outside, facilitating manual control and the repair and replacement of corresponding components in case of accidents.

[0033] Furthermore, a positioning member is further included. A plurality of positioning holes 111 are provided on the slide rail portion 11 along the sliding direction. The positioning member is detachably connected to the positioning holes 111 and at least partially extends out of the positioning holes 111 to abut and limit the slider portion 31.

[0034] Combined Figure 2 and Figure 3 As shown, a plurality of positioning holes 111 are provided on the slide rail portion 11 along the sliding direction (the sliding direction in this embodiment is the X-axis direction). The positioning holes 111 can be pin holes or threaded holes, etc. Correspondingly, the positioning member can be a pin shaft or a screw, etc. After the slider portion 31 slides to the corresponding position, it is connected to the positioning holes 111 through the positioning member, and a part of the positioning member extends out of the positioning holes 111 and abuts against the slider portion 31 to achieve the effect of abutting and limiting. The number of positioning holes 111 and the number of positioning members for abutting and limiting can be set as needed. For example, generally, the slider portion 31 can be prevented from continuing to slide in the reverse direction of the X-axis by abutting two positioning members against one end of the slider portion 31 in the reverse direction of the X-axis; in the case where the position of the proportional multi-way valve assembly 3 needs to be stable, four positioning members can be used, and every two positioning members abut against one end of the slider portion 31 to completely position the slider portion 31.

[0035] In this way, the positioning of the slider portion 31 can be achieved through the positioning member and the positioning holes 111, so that the proportional multi-way valve assembly 3 is fixed. When repair and replacement work is required or manual control is needed, the positioning member can be removed, and the proportional multi-way valve assembly 3 can be pulled to a position close to the opening of the hydraulic chamber 1.

[0036] Furthermore, the slider portion 31 includes a slider backing plate 311 and a slider body 312, the slide rail portion 11 includes a slide rail base 112 and a slide rail body 113. The proportional multi-way valve assembly 3 is installed on the slider backing plate 311, the slider body 312 is installed on the slider backing plate 311, the slide rail base 112 is installed on the inner wall of the bottom plate of the hydraulic chamber 1, the slide rail body 113 is installed on the slide rail base 112, and the slider body 312 is slidably connected to the slide rail body 113.

[0037] Combined with Figure 1 as shown Figure 3 in the figure, the slide rail base 112 is installed on the inner wall of the bottom plate of the hydraulic chamber 1 through fasteners, the slide rail body 113 is installed on the slide rail base 112 through fasteners, the slide rail body 113 is arranged along the X-axis direction in the figure, the slider body 312 is slidably connected with the slide rail body 113, the proportional multi-way valve assembly 3 is arranged on the upper surface of the slider backing plate 311, and the slider backing plate 311 is fixedly connected with the slider body 312, so that the proportional multi-way valve assembly 3 can move along the X-axis direction in the figure together with the slider backing plate 311 and the slider body 312, and the guiding function is realized through the slide rail body 113 and the slide rail base 112.

[0038] In this way, the proportional multi-way valve assembly 3 can be more conveniently pulled to the vicinity of the opening of the hydraulic chamber 1, which is convenient for maintenance and replacement work and manual control in case of accidents.

[0039] Furthermore, both ends of the slide rail part 11 are respectively provided with a first limiting part and a second limiting part, and the first limiting part and the second limiting part are used for abutting and limiting the slider part 31.

[0040] Combined with Figure 2 as shown in the figure, a first limiting hole and a second limiting hole similar to the positioning hole 111 can be respectively opened at the positions of both ends of the slide rail part 11 along the X-axis. By respectively arranging a first limiting part and a second limiting part on the first limiting hole and the second limiting hole (for example, a screw similar to a positioning part, connected to the first limiting hole and the second limiting hole and at least partially protruding for abutting and limiting with the slider part 31), different from the positioning hole 111 and the positioning part, the first limiting part and the second limiting part do not need to be disassembled, so as to prevent the slider part 31 from detaching from the slide rail part 11.

[0041] Furthermore, it further includes an oil suction filter assembly 5, and the oil suction filter assembly 5 is installed in the hydraulic chamber 1 and is respectively connected with the coal mining machine fuel tank and the pump motor assembly 2.

[0042] Combined with Figure 1 as shown in the figure, the oil suction filter assembly 5 is installed at the included angle between the front plate and the bottom plate of the hydraulic chamber 1, one end of which is connected to the oil outlet of the fuel tank, and the other end is connected to the oil inlet of the pump motor assembly 2, so that the oil can be filtered by the oil suction filter assembly 5 before entering the pump motor assembly 2, preventing impurities and particles from entering the hydraulic system and protecting the hydraulic components; at the same time, when using the oil suction filter assembly 5, the filter element needs to be frequently replaced, and by pulling the proportional multi-way valve assembly 3 to the opening of the hydraulic chamber 1, it is convenient to replace the filter element.

[0043] Further, it further includes a high-pressure filter assembly 6, and the high-pressure filter assembly 6 is installed on the inner wall of the top plate of the hydraulic chamber 1. The high-pressure filter assembly 6 is respectively connected to the pump motor assembly 2 and the proportional multi-way valve assembly 3.

[0044] Combined with Figure 1 As shown, the high-pressure filter assembly 6 is installed on the inner wall of the top plate of the hydraulic chamber 1 (i.e., the side plate on the positive side of the Z-axis in the figure), that is, the high-pressure filter assembly 6 is suspended on the top plate of the hydraulic chamber 1. The oil outlet of the pump motor assembly 2 injects high-pressure oil into the high-pressure filter assembly 6 to filter the high-pressure oil.

[0045] In this way, during the working process, the top plate of the hydraulic chamber 1 can play a certain protective role for the high-pressure filter assembly 6. At the same time, since there is no overlap between the high-pressure filter assembly 6 and other components in the hydraulic chamber 1, it is convenient for maintenance, replacement and disassembly work.

[0046] Further, it further includes a make-up oil motor pump assembly 7, and the make-up oil motor pump assembly 7 is installed in the hydraulic chamber 1 and is used to be respectively connected to the coal mining machine fuel tank and the make-up oil barrel.

[0047] Combined with Figure 1 As shown, the make-up oil motor pump assembly 7 is installed at the rear end of the bottom plate of the hydraulic chamber 1. It is provided with an oil injection port and can be connected to the make-up oil barrel through the make-up oil filter assembly 71 to make up the oil for the coal mining machine fuel tank.

[0048] Further, it further includes a liquid level gauge 8, and the liquid level gauge 8 is installed at one end of the front plate of the hydraulic chamber 1 close to the opening. The liquid level gauge 8 is connected to the coal mining machine fuel tank.

[0049] Combined with Figure 1 As shown, the liquid level gauge 8 is installed at one end of the front plate of the hydraulic chamber 1 close to the opening (i.e., at the end of the side plate on the positive side of the Y-axis in the figure of the hydraulic chamber 1 close to the opening). The liquid level gauge 8 is connected to the coal mining machine fuel tank, so as to detect the liquid level data of the coal mining machine fuel tank in real time, which is convenient for the coal mining machine driver to check and perform timely make-up oil operations; in addition, the liquid level gauge 8 can be connected to the corresponding control system to control the make-up oil motor pump assembly 7 to perform automatic make-up oil in a timely manner through the control system.

[0050] Further, it further includes a pressure gauge assembly 9, and the pressure gauge assembly 9 is installed at the front end of the hydraulic chamber 1. The pressure gauge assembly 9 is connected to the oil outlet of the pump motor assembly 2.

[0051] Combined with Figure 1As shown, the pressure gauge assembly 9 is installed at the front end of the hydraulic chamber 1 and is located above the liquid level gauge 8. It is connected to the oil outlet of the pump motor assembly 2, so as to monitor the hydraulic pump oil outlet pressure of the pump motor assembly 2 in real time, and its position is set for the coal miner to view conveniently.

[0052] In the above embodiments of the present invention, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0053] For the sake of convenience in description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" and the like can be used here to describe the spatial position relationship of one device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways, rotated 90 degrees or in other orientations, and corresponding explanations will be made for the spatial relative descriptions used here.

[0054] In addition to the above, it should also be noted that the "one embodiment", "another embodiment", "embodiment" and the like mentioned in this specification refer to the specific features, structures or characteristics described in connection with that embodiment being included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in connection with any one embodiment, it is intended that the implementation of such feature, structure or characteristic in combination with other embodiments also fall within the scope of the present invention.

[0055] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shearer hydraulic system, characterized in that, It includes a hydraulic chamber, a pump motor assembly, a proportional multi-way valve assembly, and a balance throttle valve assembly. The hydraulic chamber has an opening. The pump motor assembly, the proportional multi-way valve assembly, and the balance throttle valve assembly are connected in sequence. The pump motor assembly and the balance throttle valve assembly are installed in the hydraulic chamber. The proportional multi-way valve assembly is slidably connected to the inner wall of the hydraulic chamber to slide towards the opening.

2. The shearer hydraulic system according to claim 1, characterized in that, A slider part is installed on the proportional multi-way valve assembly. A slide rail part is installed on the inner wall of the bottom plate of the hydraulic chamber. The slider part is slidably connected to the slide rail part.

3. The shearer hydraulic system according to claim 2, wherein It further includes a positioning member. A plurality of positioning holes are provided on the slide rail part along the sliding direction. The positioning member is detachably connected to the positioning holes and at least partially extends out of the positioning holes to abut and limit the slider part.

4. The shearer hydraulic system according to claim 2, wherein, The slider part includes a slider backing plate and a slider body. The slide rail part includes a slide rail base and a slide rail body. The proportional multi-way valve assembly is installed on the slider backing plate. The slider body is installed on the slider backing plate. The slide rail base is installed on the inner wall of the bottom plate of the hydraulic chamber. The slide rail body is installed on the slide rail base. The slider body is slidably connected to the slide rail body.

5. The shearer hydraulic system according to claim 2, wherein First limiting parts and second limiting parts are respectively provided at two ends of the slide rail part. The first limiting parts and the second limiting parts are used to abut and limit the slider part.

6. The shearer hydraulic system according to claim 1, characterized in that, It further includes an oil suction filter assembly. The oil suction filter assembly is installed in the hydraulic chamber and is respectively connected to the coal mining machine oil tank and the pump motor assembly.

7. The shearer hydraulic system according to claim 1, wherein, It further includes a high-pressure filter assembly. The high-pressure filter assembly is installed on the inner wall of the top plate of the hydraulic chamber. The high-pressure filter assembly is respectively connected to the pump motor assembly and the proportional multi-way valve assembly.

8. The shearer hydraulic system according to claim 1, characterized in that, It further includes a make-up oil motor pump assembly. The make-up oil motor pump assembly is installed in the hydraulic chamber and is used to be respectively connected to the coal mining machine oil tank and the make-up oil barrel.

9. The shearer hydraulic system according to claim 8, characterized in that, It further includes a liquid level gauge. The liquid level gauge is installed at one end of the front plate of the hydraulic chamber close to the opening. The liquid level gauge is connected to the coal mining machine oil tank.

10. The shearer hydraulic system according to claim 1, characterized in that, It further includes a pressure gauge assembly. The pressure gauge assembly is installed at the front end of the hydraulic chamber. The pressure gauge assembly is connected to the oil outlet of the pump motor assembly.

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