Double pump station hydraulic system for coal mining machine in large-angle fully mechanized mining face

Abstract

The present invention discloses a dual-pump station hydraulic system for a coal mining machine suitable for a large-angle fully mechanized mining face, comprising left and right brake hydraulic circuits, left and right hydraulic pump stations, first and second load-sensitive proportional multi-way reversing valves, first, second, third and fourth two-position three-way reversing valves, the left hydraulic pump station comprising a left hydraulic oil tank and a hydraulic oil centralized oil replenishing circuit, the right hydraulic pump station comprising a right hydraulic oil tank and a gear oil centralized oil replenishing circuit, the hydraulic oil centralized oil replenishing circuit being connected to the first load-sensitive proportional multi-way reversing valve, and the gear oil centralized oil replenishing circuit being connected to the second load-sensitive proportional multi-way reversing valve. The dual-pump station hydraulic system of the present invention has a compact structure and is easy to realize intelligent integration; it realizes zero-pressure oil return of the brake to ensure safe and reliable operation of the brake; through the hydraulic oil centralized oil replenishing circuit and the gear oil centralized oil replenishing circuit, it can automatically and quickly replenish hydraulic oil for the left and right hydraulic oil tanks and replenish gear oil for each gear box of the coal mining machine.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining machinery, and relates to a double pump station hydraulic system of a coal mining machine suitable for a fully mechanized mining working face with a large dip angle. Background Art

[0002] like Figure 1 As shown, the hydraulic system of the coal mining machine suitable for the high-angle fully mechanized mining working face in the prior art generally includes a left rocker arm height adjustment cylinder 1, a balance valve 2, a right rocker arm height adjustment cylinder 3, a load-sensitive proportional multi-way reversing valve 4, a pressure instrument device 5, an accumulator 6, a high-pressure ball valve 7, a one-way valve 8, a pressure reducing valve 9, an electromagnetic reversing valve 10, a left brake 11, a right brake 12, an air filter 13, an oil return cooler 14, a hydraulic oil tank 15, an oil suction filter 16, a gear pump 17, a liquid level gauge 18, a two-position three-way electromagnetic reversing valve 19, a high-pressure filter 20, a gear oil refueling filter 21, a motor-pump unit 22, a gear oil refueling valve 23, and a pump station motor 24.

[0003] The hydraulic system of the coal mining machine in the prior art is not reasonably configured, and the integration and intelligence are low; the brake has delay and unstable braking; there are common problems such as damage due to cavitation of the height adjustment pump and low operating reliability of the height adjustment hydraulic system; on-site maintenance is difficult and production efficiency is low. More specifically, the hydraulic system of the coal mining machine suitable for the high-angle fully-mechanized mining working face in the prior art has the following deficiencies and shortcomings:

[0004] 1. It occupies a large space, has a low degree of integration, and the components are installed in a relatively scattered manner. The pressure oil pipeline is too long, and there are many control risks. It cannot meet the development needs of the site for the coal mining machine hydraulic system with a compact structure, reliable braking, powerful functions, and a high degree of integration and intelligence.

[0005] 2. In actual application, the brake control method is to obtain pressure oil from the branch of the pump station, and then set up a solenoid valve and a pressure reducing valve to control it, and then enter the brake. For specific examples, see Figure 1 As shown in area I which represents the working principle of the existing brake, this brake control method is complex, occupies a large space, has many intermediate pipelines, has poor oil return, high back pressure, unreliable operation, and has long delayed response time and unstable braking.

[0006] 3. The hydraulic oil tank is a single integral oil tank, which occupies a large space alone and has large component dimensions, which is not conducive to the high integration of various components. In practical application, in order to meet the actual needs of coal mining at large-angle working faces, the hydraulic oil tank needs to be lengthened and raised. At the same time, in order to solve the problem of oil leakage from the breather plug, the breather plug must be installed at a higher level. The oil suction filter installed in the hydraulic oil tank cannot be arranged in an ideal position. In actual use, the use of the hydraulic oil tank of the coal mining machine to suck oil at large-angle working faces has become a prominent problem. The oil suction device of the hydraulic oil tank of the coal mining machine cannot simultaneously meet the normal oil suction requirements of the left and right working faces at large angles. Especially in the use of thin coal seams at large angles, the suction damage of the coal mining machine height adjustment pump and the abnormal operation of the height adjustment hydraulic system are common.

[0007] 4. It is very difficult to maintain the equipment under the condition of large-angle thin coal seams. The maintenance time is too long. The local thin coal seam working surface may cause a large amount of roof subsidence, which poses a serious mining safety hazard, seriously affects the mining speed, and greatly reduces the production efficiency. It is necessary to consider solving the problem of fast and convenient maintenance of the hydraulic system. For specific examples, see Figure 1 As shown in area II showing the working principle of the existing centralized gear oil filling system, there is a lack of a centralized hydraulic oil filling system, and workers are required to manually fill the hydraulic oil during actual work. Summary of the invention

[0008] Therefore, with the need for high reliability and intelligent requirements for coal mining machines, the power of coal mining machines is getting larger and larger, and the functions are increasing. The adaptability requirements for coal seams are getting higher and higher, and correspondingly higher requirements are put forward for hydraulic systems. To this end, the hydraulic system needs to be designed to be more sophisticated and compact, reliable in braking, powerful in function, highly intelligent, and highly integrated, so as to simplify the space occupied by the oil tank as much as possible, and completely solve the problem of gear pump suction during work; effectively solve the problem of reliable and stable braking of coal mining machines; solve the problem of fast and convenient maintenance of hydraulic systems to improve production efficiency.

[0009] In order to solve some or all of the above technical problems, the present invention provides a dual-pump station hydraulic system for a coal mining machine with a large-angle fully-mechanized mining working face, comprising a left rocker arm height adjustment cylinder and a balancing valve connected to the left rocker arm height adjustment cylinder, a right rocker arm height adjustment cylinder and a balancing valve connected to the right rocker arm height adjustment cylinder, and the dual-pump station hydraulic system for a coal mining machine with a large-angle fully-mechanized mining working face also includes: a left brake hydraulic circuit, a right brake hydraulic circuit, a left hydraulic pump station, a right hydraulic pump station, a first load-sensitive proportional multi-way reversing valve, and a second load-sensitive proportional multi-way reversing valve, wherein:

[0010] The left brake hydraulic circuit includes a left brake and a hydraulically controlled two-position three-way stop-type reversing valve; the right brake hydraulic circuit includes a right brake and a hydraulically controlled two-position three-way stop-type reversing valve;

[0011] The left hydraulic pump station includes a left hydraulic oil tank, a first gear pump, a high-pressure filter connected to the first gear pump, a hydraulic oil centralized oil replenishment circuit, a first two-position three-way reversing valve for controlling the opening and closing of the left hydraulic pump station suction port, and a second two-position three-way reversing valve for controlling the opening and closing of the left hydraulic pump station return port. The hydraulic oil centralized oil replenishment circuit includes a first motor-pump unit, a hydraulic oil refueling filter, and a hydraulic oil refueling valve group device;

[0012] The right hydraulic pump station includes a right hydraulic oil tank, a second gear pump, a high-pressure filter connected to the second gear pump, a gear oil centralized oil replenishment circuit, a third two-position three-way reversing valve for controlling the opening and closing of the right hydraulic pump station suction port, and a fourth two-position three-way reversing valve for controlling the opening and closing of the right hydraulic pump station return port. The gear oil centralized oil replenishment circuit includes a second motor-pump unit, a gear oil refueling filter, and a gear oil refueling valve group device;

[0013] The first load-sensitive proportional multi-way reversing valve comprises a left brake oil port, a hydraulic oil centralized oil replenishment port, a left rocker arm height adjustment cylinder A oil port, and a left rocker arm height adjustment cylinder B oil port. The left rocker arm height adjustment cylinder is connected to the first load-sensitive proportional multi-way reversing valve through the left rocker arm height adjustment cylinder A oil port and the left rocker arm height adjustment cylinder B oil port. The left brake is connected to the first load-sensitive proportional multi-way reversing valve through the left brake oil port. The hydraulic oil centralized oil replenishment circuit is connected to the first load-sensitive proportional multi-way reversing valve through the hydraulic oil centralized oil replenishment port.

[0014] The second load-sensitive proportional multi-way reversing valve includes a right brake oil port, a gear oil replenishing port, a right rocker arm height adjustment cylinder A oil port, and a right rocker arm height adjustment cylinder B oil port. The right rocker arm height adjustment cylinder is connected to the second load-sensitive proportional multi-way reversing valve through the right rocker arm height adjustment cylinder A oil port and the right rocker arm height adjustment cylinder B oil port. The right brake is connected to the second load-sensitive proportional multi-way reversing valve through the right brake oil port, and the gear oil centralized oil replenishing circuit is connected to the second load-sensitive proportional multi-way reversing valve through the gear oil replenishing port.

[0015] Furthermore, in the above-mentioned dual pump station hydraulic system of the coal mining machine suitable for large-angle comprehensive mining working faces, the first load-sensitive proportional multi-way directional valve includes a tail plate, a second middle plate, a first middle plate, a first plate, an overflow valve, an oil inlet, an oil drain port, and an oil return port, and the left brake oil port is arranged on the second middle plate of the first load-sensitive proportional multi-way directional valve; the second load-sensitive proportional multi-way directional valve includes a tail plate, a second middle plate, a first middle plate, a first plate, an overflow valve, an oil inlet, an oil drain port, and an oil return port, and the right brake oil port is arranged on the second middle plate of the second load-sensitive proportional multi-way directional valve.

[0016] Furthermore, in the above-mentioned dual-pump station hydraulic system of the coal mining machine suitable for the high-angle comprehensive mining working face, the hydraulically controlled two-position three-way stop-type reversing valve is a tubular installation structure, including a brake oil inlet, a brake oil return port, an oil outlet, and a hydraulic control port, wherein the brake oil inlet is connected to the left brake oil port of the first load-sensitive proportional multi-way reversing valve and the right brake oil port of the second load-sensitive proportional multi-way reversing valve, the brake oil return port is connected to the left hydraulic oil tank and the right hydraulic oil tank, and the oil outlet is connected to the left brake and the right brake.

[0017] Furthermore, in the above-mentioned dual pump station hydraulic system of the coal mining machine suitable for large-angle fully-mechanized mining working faces, the left hydraulic oil tank and the right hydraulic oil tank are respectively embedded in the left traction transmission box and the right traction transmission box of the coal mining machine, and the left hydraulic oil tank and the right hydraulic oil tank are provided with temperature sensors, oil level sensors, centralized oil return cooling devices, pre-pressure air filters, oil suction filters, and liquid level gauges.

[0018] Furthermore, in the above-mentioned dual pump station hydraulic system of the coal mining machine suitable for high-angle fully-mechanized mining working faces, the pre-pressure air filter consists of four parts: an air filter, an air intake check valve, an exhaust check valve, and a refueling filter.

[0019] Furthermore, in the above-mentioned dual pump station hydraulic system of the coal mining machine suitable for high-angle comprehensive mining working faces, the left hydraulic oil tank and the right hydraulic oil tank also include a brake oil return interface, and the brake oil return port of the hydraulically controlled two-position three-way stop reversing valve is connected to the brake oil return interface.

[0020] Furthermore, in the above-mentioned dual pump station hydraulic system of the coal mining machine suitable for high-angle fully mechanized mining working face, the centralized oil return cooling device includes a cooler, a cooler housing, a hydraulic system total oil return port, a cooling water inlet and a cooling water outlet.

[0021] Furthermore, in the above-mentioned dual pump station hydraulic system of the coal mining machine suitable for high-angle fully-mechanized mining working faces, the first motor-pump unit in the hydraulic oil centralized oil replenishment circuit and the second motor-pump unit in the gear oil centralized oil replenishment circuit are both integrated structures of motors and pumps, including a pump suction port, a pump oil outlet, a motor oil outlet, and a motor oil inlet.

[0022] Furthermore, in the above-mentioned dual pump station hydraulic system of the coal mining machine suitable for high-angle fully-mechanized mining working faces, the hydraulic oil refueling valve group device in the hydraulic oil centralized oil replenishment circuit includes a throttle valve, a hydraulic oil replenishment inlet, a banzhu block, a right hydraulic oil tank replenishment interface, and a left hydraulic oil tank replenishment interface, and the hydraulic oil replenishment inlet is connected to the pump outlet of the first motor-pump unit.

[0023] Furthermore, in the above-mentioned dual pump station hydraulic system of the coal mining machine suitable for high-angle fully-mechanized mining working face, the gear oil refueling valve group device in the gear oil centralized oil replenishment circuit includes a throttle valve, a gear oil replenishment inlet, a banzhu block, a right planetary gearbox refueling interface, a right rocker arm gearbox refueling interface, a right traction gearbox refueling interface, a left traction gearbox refueling interface, a left rocker arm gearbox refueling interface, and a left planetary gearbox refueling interface, and the gear oil replenishment inlet is connected to the pump outlet of the second motor-pump unit.

[0024] The main technical effects of the double pump station hydraulic system of the coal mining machine applicable to the large-angle fully-mechanized mining working face of the present invention include:

[0025] Two independent small hydraulic oil tanks are embedded in the free cavity of the left and right traction transmission boxes, which have compact structure, convenient maintenance, miniaturized components and easy intelligent integration.

[0026] The secondary pressure regulation of the load-sensitive proportional multi-way reversing valve is fully utilized to control the brake and directly obtain the pressure oil in a centralized manner, which greatly saves space. The pressure difference control of the hydraulically controlled two-position three-way stop reversing valve is utilized to eliminate the influence of back pressure, and the return oil pipeline of the brake is directly returned to the hydraulic oil tank separately, truly realizing zero-pressure oil return and ensuring safe and reliable operation of the brake.

[0027] According to the actual inclination of the mining working face and the oil level data of the hydraulic oil tank, the two-position three-way reversing valve can intelligently control the opening and closing of the suction / return oil circuits of the left and right hydraulic pump stations. In addition, the pre-pressure air filter installed on the upper part of the hydraulic oil tank improves the self-priming ability of the gear pump under complex working conditions, maintains the stability of the liquid in the oil tank, and avoids possible failures such as cavitation of the gear pump due to vibration or disturbance of the liquid in the oil tank;

[0028] Through the centralized hydraulic oil replenishment circuit and the gear oil centralized gear oil replenishment circuit, the hydraulic oil can be automatically and quickly replenished into the left and right hydraulic oil tanks and the gear oil can be replenished into each gear box of the coal mining machine, thus overcoming the disadvantages of high labor intensity, cumbersome operation and low production efficiency caused by manual oil replenishment under the conditions of fully-mechanized mining working faces in high-angle coal seams. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0030] Figure 1It is a schematic diagram of the structural principle of the hydraulic system of a coal mining machine applicable to a fully mechanized coal mining face with a large inclination angle in the prior art;

[0031] Figure 2 It is a schematic diagram of the structural principle of the double pump station hydraulic system of the coal mining machine applicable to the fully mechanized mining working face with a large dip angle of the present invention;

[0032] Figure 3a and Figure 3b They are respectively structural schematic diagrams of a first load-sensitive proportional multi-way reversing valve and a second load-sensitive proportional multi-way reversing valve in a double pump station hydraulic system of a coal mining machine suitable for a fully mechanized mining face with a large dip angle according to the present invention;

[0033] Figure 4 It is a structural schematic diagram of a hydraulically controlled two-position three-way stop-type reversing valve in a double pump station hydraulic system of a coal mining machine suitable for a fully mechanized mining face with a large dip angle according to the present invention;

[0034] Figure 5 It is a structural schematic diagram of a left hydraulic oil tank and a right hydraulic oil tank in a double pump station hydraulic system of a coal mining machine applicable to a fully mechanized mining face with a large dip angle according to the present invention;

[0035] Figure 6a and Figure 6b The structure diagram of the centralized oil return cooling device in the double pump station hydraulic system of the coal mining machine applicable to the large-angle fully-mechanized mining working face of the present invention is shown in FIG. Figure 6b yes Figure 6a Side view of

[0036] Figure 7a , Figure 7b and Figure 7c The present invention is a schematic diagram of the structure of the first motor-pump unit and the second motor-pump unit in the double pump station hydraulic system of the coal mining machine suitable for the large-angle fully-mechanized mining working face, wherein Figure 7a and Figure 7c yes Figure 7b Side view of

[0037] Figure 8 It is a structural schematic diagram of a hydraulic oil filling valve group device in a double pump station hydraulic system of a coal mining machine suitable for a fully mechanized mining face with a large dip angle according to the present invention;

[0038] Fig. 9 It is a structural schematic diagram of a gear oil filling valve group device in a double pump station hydraulic system of a coal mining machine suitable for a large-angle fully mechanized mining working face according to the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] like Figure 2 As shown, the dual-pump station hydraulic system of the coal mining machine suitable for the large-angle fully-mechanized mining working face of the present invention includes: a left rocker arm height adjustment cylinder 1 and a balance valve 2 connected to the left rocker arm height adjustment cylinder 1, a right rocker arm height adjustment cylinder 3 and a balance valve 2 connected to the right rocker arm height adjustment cylinder 3, a left brake hydraulic circuit I, a right brake hydraulic circuit II, a left hydraulic pump station III, a right hydraulic pump station IV, a first load-sensitive proportional multi-way reversing valve 27, and a second load-sensitive proportional multi-way reversing valve 49.

[0041] The left brake hydraulic circuit I includes the left brake 11, the pressure meter 5, the hydraulically controlled two-position three-way stop-type reversing valve 25, and the low-pressure sensor 26. The right brake hydraulic circuit II includes the right brake 12, the pressure meter 5, the hydraulically controlled two-position three-way stop-type reversing valve 25, and the low-pressure sensor 26.

[0042] The left hydraulic pump station III includes a left hydraulic oil tank 34, a first gear pump 17, a high-pressure filter 20 connected to the first gear pump 17, a hydraulic oil centralized oil replenishment circuit III.1, a first two-position three-way reversing valve 33 for controlling the opening and closing of the left hydraulic pump station III suction port, and a second two-position three-way reversing valve 51 for controlling the opening and closing of the left hydraulic pump station III return port. The left hydraulic oil tank 34 is provided with a temperature sensor 37, an oil level sensor 38, a centralized return oil cooling device 35, a pre-pressure air filter 36, an oil suction filter 16, and a liquid level meter 18. The first gear pump 17 is equipped with a first pump station motor 24 and a high-pressure sensor 31. The hydraulic oil centralized oil replenishment circuit III.1 includes a first motor-pump unit 22, a hydraulic oil refueling filter 32, and a hydraulic oil refueling valve group device 30.

[0043] The right hydraulic pump station IV includes a right hydraulic oil tank 43, a second gear pump 44, a high-pressure filter 20 connected to the second gear pump 44, a gear oil centralized oil replenishment circuit IV.1, a third two-position three-way reversing valve 39 for controlling the opening and closing of the right hydraulic pump station IV suction port, and a fourth two-position three-way reversing valve 52 for controlling the opening and closing of the right hydraulic pump station IV return oil port. The right hydraulic oil tank 43 is provided with a temperature sensor 37, an oil level sensor 38, a centralized return oil cooling device 35, a pre-pressure air filter 36, an oil suction filter 16, and a liquid level gauge 18. The second gear pump 44 is equipped with a second pump station motor 45 and a high-pressure sensor 31. The gear oil centralized oil replenishment circuit IV.1 includes a second motor-pump unit 46, a gear oil refueling filter 21, and a gear oil refueling valve group device 42.

[0044] The first load-sensitive proportional multi-way reversing valve 27 includes a left brake oil port 28, a hydraulic oil centralized replenishing port 29, a left rocker arm height adjustment cylinder A oil port 47, and a left rocker arm height adjustment cylinder B oil port 48. The second load-sensitive proportional multi-way reversing valve 49 includes a right brake oil port 40, a gear oil replenishing port 41, a right rocker arm height adjustment cylinder A oil port 59, and a right rocker arm height adjustment cylinder B oil port 60. The left rocker arm height adjustment cylinder 1 is connected to the first load-sensitive proportional multi-way reversing valve 27 through the left rocker arm height adjustment cylinder A oil port 47 and the left rocker arm height adjustment cylinder B oil port 48, and the right rocker arm height adjustment cylinder 3 is connected to the second load-sensitive proportional multi-way reversing valve 49 through the right rocker arm height adjustment cylinder A oil port 59 and the right rocker arm height adjustment cylinder B oil port 60. The left brake 11 is connected to the first load-sensitive proportional multi-way reversing valve 27 through the left brake oil port 28, and the right brake 12 is connected to the second load-sensitive proportional multi-way reversing valve 49 through the right brake oil port 40. The hydraulic oil centralized oil replenishment circuit III.1 is connected to the first load-sensitive proportional multi-way reversing valve 27 through the hydraulic oil centralized oil replenishment port 29, and the gear oil centralized oil replenishment circuit IV.1 is connected to the second load-sensitive proportional multi-way reversing valve 49 through the gear oil replenishment port 41.

[0045] Specifically, Figure 3a and Figure 3b As shown, Figure 3a The structure of the first load-sensitive proportional multi-way reversing valve 27 is shown. Figure 3bThe structure of the second load-sensitive proportional multi-way reversing valve 49 is shown. The first load-sensitive proportional multi-way reversing valve 27 includes a tail plate 53, a second intermediate plate 54, a first intermediate plate 55, a first plate 56, a relief valve 57, an oil inlet 58, a left brake oil port 28, a hydraulic oil centralized oil replenishment port 29, a left rocker arm height adjustment cylinder A oil port 47, a left rocker arm height adjustment cylinder B oil port 48, an oil drain port 61, and an oil return port 62. The structure of the second load-sensitive proportional multi-way reversing valve 49 is the same as that of the first load-sensitive proportional multi-way reversing valve 27, including a tail plate 53, a second intermediate plate 54, a first intermediate plate 55, a first plate 56, a relief valve 57, an oil inlet 58, a right brake oil port 40, a gear oil replenishment port 41, a right rocker arm height adjustment cylinder A oil port 59, a right rocker arm height adjustment cylinder B oil port 60, an oil drain port 61, and an oil return port 62.

[0046] As described above, the dual-pump station hydraulic system of the coal mining machine suitable for the high-angle fully-mechanized mining face of the present invention improves the brake system structure in the prior art, eliminates the branch oil extraction and solenoid valves and pressure reducing valves that bring about the problems of complex control, large space occupation, long intermediate pipelines, poor oil return, large back pressure, unreliable operation, etc., and uses the left brake oil port 28 / right brake oil port 40 set on the second middle plate of the first load-sensitive proportional multi-way reversing valve 27 / second load-sensitive proportional multi-way reversing valve 49 to directly obtain the pressure oil in a centralized manner, and enter the left brake 11 / right brake 12 through the hydraulically controlled two-position three-way stop reversing valve 25. Specifically, as Figure 4 As shown, the hydraulically controlled two-position three-way stop-type directional control valve 25 is a tubular installation structure, which includes a brake oil inlet 63, a brake oil return port 64, an oil outlet 65, and a hydraulic control port 66, wherein the brake oil inlet 63 is connected to the left brake oil port 28 of the first load-sensitive proportional multi-way directional control valve 27 and the right brake oil port 40 of the second load-sensitive proportional multi-way directional control valve 49, the brake oil return port 64 is connected to the left hydraulic oil tank 34 and the right hydraulic oil tank 43, and the oil outlet 65 is connected to the left brake 11 and the right brake 12.

[0047] The middle plate of the first load-sensitive proportional multi-way reversing valve 27 / the second load-sensitive proportional multi-way reversing valve 49 has the functions of controlling the oil circuit and secondary pressure regulation. Moreover, the hydraulic control two-position three-way stop reversing valve 25 is hydraulically controlled to change the direction. Its internal pressure is balanced, and the pressure that each oil port can withstand is equal. When not in operation, the valve reset by the spring will automatically return to the zero position or the middle position, and the operation is reliable and zero leakage. Therefore, the double pump station hydraulic system of the coal mining machine suitable for the large-angle fully-mechanized mining working face of the present invention makes full use of the secondary pressure regulation control braking of the load-sensitive proportional multi-way reversing valves 27 and 49 and directly obtains the pressure oil in a centralized manner, which greatly saves space, and utilizes the pressure difference control of the hydraulic control two-position three-way stop reversing valve 25 to eliminate the back pressure effect, and the return oil pipelines of the left brake 11 and the right brake 12 are directly returned to the left hydraulic oil tank 34 and the right hydraulic oil tank 43 respectively, so as to truly realize zero-pressure oil return and ensure the safe and reliable operation of the brake.

[0048] As described above, the dual-pump station hydraulic system of the coal mining machine suitable for the large-angle fully-mechanized mining face of the present invention splits a large integral oil tank in the prior art into two independent small hydraulic oil tanks, namely the left hydraulic oil tank 34 and the right hydraulic oil tank 43. In the present invention, the left hydraulic oil tank 34 and the right hydraulic oil tank 43 are respectively embedded in the left traction transmission box and the right traction transmission box of the coal mining machine, making full use of the spare and idle cavity space of the equipment traction box itself. Moreover, under normal circumstances, the left hydraulic oil tank 34 and the right hydraulic oil tank 43 are independently operated and controlled to provide power for the left and right rocker arms of the coal mining machine. The left rocker arm height adjustment cylinder 1 and the right rocker arm height adjustment cylinder 3 can be independently controlled without affecting each other, so that the left and right rocker arms can be independently moved, and the left and right rocker arms can be moved simultaneously.

[0049] The left hydraulic oil tank 34 and the right hydraulic oil tank 43 have the same structure, and are specifically as follows: Figure 5 As shown, in addition to the centralized return oil cooling device 35, the pre-pressure air filter 36, and the oil suction filter 16 mentioned above, the left hydraulic oil tank 34 and the right hydraulic oil tank 43 also include a brake return oil interface 50 and an oil drain plug 67. The brake return oil port 64 of the hydraulically controlled two-position three-way stop-type reversing valve 25 is connected to the brake return oil interface 50, thereby, the return oil of the left brake 11 and the right brake 12 is directly returned to the left hydraulic oil tank 34 and the right hydraulic oil tank 43.

[0050] The centralized oil return cooling device 35 disposed in the left hydraulic oil tank 34 and the right hydraulic oil tank 43 is used to cool the oil in the left hydraulic oil tank 34 and the right hydraulic oil tank 43. Figure 6a and Figure 6bAs shown, the centralized oil return cooling device 35 includes a cooler 68, a cooler housing 69, a hydraulic system total oil return port 70, a cooling water inlet 71 and a cooling water outlet 72. Through the centralized oil return cooling device 35 in the dual pump station hydraulic system of the coal mining machine suitable for the large-angle fully mechanized mining working face of the present invention, all the return oil of the hydraulic system enters the cooler housing 69 through the hydraulic system total oil return port 70, and is centrally cooled by the cooler 68. In addition, the defoaming, precipitation and filtering structure is designed at the end of the cooler housing 69, so that all the return oil of the hydraulic system of the present invention is centrally cooled by the oil return cooling device 35, and then defoamed, precipitated and filtered at the end, and finally enters the left hydraulic oil tank 34 and the right hydraulic oil tank 43, which greatly avoids the foam and impurities generated by the large amount of return oil of the hydraulic system, thereby preventing the instability of the hydraulic system caused by the suction filter 16 sucking in foam air and debris, ensuring the quality of the oil returned to the hydraulic oil tank, and ensuring the good operation of the hydraulic system.

[0051] As described above, the dual pump station hydraulic system of the coal mining machine suitable for high-angle fully-mechanized mining working faces of the present invention is provided with a hydraulic oil centralized oil replenishment circuit III.1 and a gear oil centralized oil replenishment circuit IV.1. The hydraulic oil centralized oil replenishment circuit III.1 is used to replenish hydraulic oil into the left hydraulic oil tank 34 and the right hydraulic oil tank 43, and the gear oil centralized oil replenishment circuit IV.1 is used to replenish gear oil into each gear box of the coal mining machine.

[0052] The first motor-pump unit 22 in the hydraulic oil centralized oil replenishment circuit III.1 and the second motor-pump unit 46 in the gear oil centralized oil replenishment circuit IV.1 have the same structure. Figure 7a , Figure 7b and Figure 7c As shown, they are all integrated structures of a motor and a pump, including a pump oil suction port 73 and a pump oil outlet 74 located on one side end of the first motor-pump unit 22 / the second motor-pump unit 46, and a motor oil outlet 77 and a motor oil inlet 78 located on the other side end of the first motor-pump unit 22 / the second motor-pump unit 46. In addition, the first motor-pump unit 22 / the second motor-pump unit 46 also includes an oil drain port 75 and an oil peep port 76 arranged on its structural body.

[0053] like Figure 8 As shown, the hydraulic oil filling valve group device 30 in the hydraulic oil centralized oil filling circuit III.1 includes a throttle valve 79, a hydraulic oil filling inlet 89, a band block 80, a right hydraulic oil tank filling interface 81, and a left hydraulic oil tank filling interface 82. The hydraulic oil filling inlet 89 is connected to the pump outlet 74 of the first motor-pump unit 22, thereby filling the hydraulic oil into the right hydraulic oil tank 43 and the left hydraulic oil tank 34 through the right hydraulic oil tank filling interface 81 and the left hydraulic oil tank filling interface 82. It is particularly noted here that in the entire application, the band block refers to an articulated rotatable pipe joint used for pipeline connection in a hydraulic system.

[0054] like Fig. 9 As shown, the gear oil filling valve group device 42 in the gear oil centralized filling circuit IV.1 includes a throttle valve 79, a gear oil filling inlet 90, a banzhu block 80, a right planetary gearbox filling interface 83, a right rocker gearbox filling interface 84, a right traction gearbox filling interface 85, a left traction gearbox filling interface 86, a left rocker gearbox filling interface 87, and a left planetary gearbox filling interface 88. The gear oil filling inlet 90 is connected to the pump oil outlet 74 of the second motor-pump unit 46, thereby filling the gear oil into each gearbox of the coal mining machine through the right planetary gearbox filling interface 83, the right rocker gearbox filling interface 84, the right traction gearbox filling interface 85, the left traction gearbox filling interface 86, the left rocker gearbox filling interface 87, and the left planetary gearbox filling interface 88.

[0055] The plug-in throttle valve 79 configured for the hydraulic oil filling valve group device 30 and the gear oil filling valve group device 42 can control the throttling or shutting off of each oil replenishment branch flow. Therefore, through the first motor-pump unit 22 and the hydraulic oil filling valve group device 30 in the above-mentioned hydraulic oil centralized oil replenishment circuit III.1, the second motor-pump unit 46 and the gear oil filling valve group device 42 in the above-mentioned gear oil centralized oil replenishment circuit IV.1, and the plug-in throttle valve 79 configured for the hydraulic oil filling valve group device 30 and the gear oil filling valve group device 42, the left hydraulic oil tank 34 and the right hydraulic oil tank 43 are centrally filled with hydraulic oil, and the gear oil is centrally filled with gear oil for each gear box of the coal mining machine.

[0056] As described above, the dual-pump station hydraulic system of the coal mining machine of the present invention, which is suitable for the fully mechanized mining face with a large inclination, is provided with a first two-position three-way reversing valve 33 and a second two-position three-way reversing valve 51 for controlling the opening and closing of the oil circuit of the left hydraulic pump station III, and a third two-position three-way reversing valve 39 and a fourth two-position three-way reversing valve 52 for controlling the opening and closing of the oil circuit of the right hydraulic pump station IV. Therefore, according to the actual inclination of the mining face detected by the inclination sensor configured by the coal mining machine itself and the oil level data monitored in real time by the oil level sensor 38 provided on the left hydraulic oil tank 34 and the right hydraulic oil tank 43, the first two-position three-way reversing valve 33 and the second two-position three-way reversing valve 51 as well as the third two-position three-way reversing valve 39 and the fourth two-position three-way reversing valve 52 can intelligently control the opening and closing of the suction / return oil circuits of the left hydraulic pump station III and the right hydraulic pump station IV, respectively, that is, when the left hydraulic oil tank 34 is about to be sucked empty, the left hydraulic pump station The oil suction and return pipelines of III are switched to the right hydraulic oil tank 43 for oil suction and oil return by the first two-position three-way reversing valve 33 and the second two-position three-way reversing valve 51; similarly, when the right hydraulic oil tank 43 is about to be emptied, the oil suction and return pipelines of the right hydraulic pump station IV are switched to the left hydraulic oil tank 34 for oil suction and oil return by the third two-position three-way reversing valve 39 and the fourth two-position three-way reversing valve 52; when the actual inclination angle of the mining working face returns to the normal inclination angle, the connecting oil circuits of the left hydraulic pump station III and the right hydraulic pump station IV are cut off, and their independent operation control is restored without affecting each other.

[0057] In addition, as mentioned above, the left hydraulic oil tank 34 and the right hydraulic oil tank 43 are provided with a pre-pressure air filter 36, and the pre-pressure air filter 36 is composed of four parts: an air filter, an intake check valve, an exhaust check valve, and a refueling filter. When the hydraulic system is working, the liquid level in the hydraulic oil tank rises or falls from time to time. When the liquid level falls, the pre-pressure air filter 36 inhales air, and the air automatically enters the intake check valve through the air filter screen and then enters the hydraulic oil tank. At this time, the pressure in the hydraulic oil tank is less than the pre-pressure pressure, and the exhaust check valve is in a closed state, which can maintain the predetermined pressure in the hydraulic oil tank, improve the self-priming ability of the first gear pump 17 and the second gear pump 44 under complex working conditions, maintain the stability of the oil in the hydraulic oil tank, and avoid the possible failure of the gear pump to suck air due to vibration or turbulence of the oil in the hydraulic oil tank. When the liquid level rises due to the return oil flowing back to the hydraulic oil tank after the working cycle, the temperature of the working oil also rises, generating oil mist gas and increasing the pressure in the hydraulic oil tank. When the pressure in the hydraulic oil tank is greater than the predetermined pressure, the exhaust check valve automatically opens to exhaust air outward until the pressure in the hydraulic oil tank is equal to the predetermined pressure, and the exhaust check valve automatically closes, thereby maintaining the predetermined pressure in the hydraulic oil tank. This reciprocating cycle can not only protect the normal operation of the hydraulic system and improve the oil absorption efficiency, but also extend the working cycle and service life of the oil and components.

[0058] In summary, compared with the prior art, the dual pump station hydraulic system of the coal mining machine suitable for the large-angle fully-mechanized mining working face of the present invention has the following advantages and beneficial effects:

[0059] 1. Double pump station setting

[0060] The hydraulic system of the present invention divides an integral large oil tank into two independent small hydraulic oil tanks, and utilizes the idle cavities of the left and right traction transmission boxes as oil tanks. The fuselage does not need to be lengthened, which saves more than 15% of space compared with the existing oil tank design. The left and right hydraulic oil tanks are of integrated design, embedded in the left and right traction transmission boxes, and are integrated with the traction transmission boxes, with a compact structure and easy maintenance. The main components are miniaturized, and it is easy to achieve highly intelligent integration.

[0061] 2. Braking

[0062] In the hydraulic system of the present invention, the brake pressure oil is taken from the brake oil port of the second plate of the middle plate of the load-sensitive proportional multi-way reversing valve, and the middle plate has the function of controlling the oil circuit and secondary pressure regulation; a hydraulically controlled two-position three-way stop reversing valve is arranged in front of the brake, and the valve is a conical seat valve, tube-mounted, and hydraulically controlled reversing mode. Due to its internal pressure balance, the pressure that each oil port can withstand is equal. When not in operation, the spring-reset valve will automatically return to zero position or middle position. The hydraulic system of the present invention makes full use of the secondary pressure regulation of the load-sensitive proportional multi-way reversing valve to control braking and directly and centrally obtain pressure oil, which greatly saves space, and utilizes the pressure difference control of the hydraulically controlled two-position three-way stop reversing valve to eliminate the influence of back pressure, and directly returns the return oil pipeline of the brake to the hydraulic oil tank separately, truly realizing zero-pressure oil return, and ensuring safe and reliable operation of the brake.

[0063] 3. Gear pump oil suction

[0064] In the hydraulic system of the present invention, according to the actual inclination angle of the mining working face and the oil level data of the hydraulic oil tank, the two-position three-way reversing valve can intelligently control the opening and closing of the suction / return oil circuits of the left hydraulic pump station III and the right hydraulic pump station IV. In addition, the pre-pressure air filter arranged on the upper part of the hydraulic oil tank simplifies the structure of the oil tank, is conducive to the purification of the oil, improves the self-priming ability of the gear pump under complex working conditions, maintains the stability of the liquid in the oil tank, and avoids possible failures such as suction of the gear pump due to vibration or disturbance of the liquid in the oil tank, which can not only protect the normal operation of the hydraulic system, but also extend the working cycle and service life of the oil and components.

[0065] 4. Refueling

[0066] In the hydraulic system of the present invention, through the hydraulic oil centralized replenishing circuit III.1 and the gear oil centralized replenishing circuit IV.1, the hydraulic oil can be automatically, massively and rapidly replenished into the left and right hydraulic oil tanks as well as the gear oil can be replenished into the gear boxes of the coal mining machine, thereby solving the problems of high labor intensity, complicated operation and low production efficiency caused by manual oil replenishment under the conditions of the fully-mechanized mining working face in the high-angle coal seam.

[0067] 5. Centralized oil return cooling

[0068] In the hydraulic system of the present invention, a centralized oil return cooling device is arranged in the oil return pipeline inside the hydraulic oil tank, and all the return oil of the hydraulic system enters the cooler housing through the total oil return port of the hydraulic system and is centrally cooled by the cooler. The centralized oil return cooling device has a compact structure, high pressure resistance, high heat dissipation efficiency, good effect, is not easy to be blocked, and is extremely convenient to maintain.

[0069] It should be noted that, in this article, relational terms 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 these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double pump station hydraulic system for a coal mining machine in a fully mechanized mining face with a large inclination angle, comprising a left rocker arm height adjustment cylinder and a balancing valve connected to the left rocker arm height adjustment cylinder, a right rocker arm height adjustment cylinder and a balancing valve connected to the right rocker arm height adjustment cylinder, characterized in that: The dual-pump station hydraulic system of the coal mining machine suitable for the large-angle fully-mechanized mining working face also includes: a left brake hydraulic circuit, a right brake hydraulic circuit, a left hydraulic pump station, a right hydraulic pump station, a first load-sensitive proportional multi-way reversing valve, and a second load-sensitive proportional multi-way reversing valve, wherein: The left brake hydraulic circuit includes a left brake and a hydraulically controlled two-position three-way stop-type reversing valve; the right brake hydraulic circuit includes a right brake and a hydraulically controlled two-position three-way stop-type reversing valve; The left hydraulic pump station includes a left hydraulic oil tank, a first gear pump, a high-pressure filter connected to the first gear pump, a hydraulic oil centralized oil replenishment circuit, a first two-position three-way reversing valve for controlling the opening and closing of the left hydraulic pump station suction port, and a second two-position three-way reversing valve for controlling the opening and closing of the left hydraulic pump station return port. The hydraulic oil centralized oil replenishment circuit includes a first motor-pump unit, a hydraulic oil refueling filter, and a hydraulic oil refueling valve group device; The right hydraulic pump station includes a right hydraulic oil tank, a second gear pump, a high-pressure filter connected to the second gear pump, a gear oil centralized oil replenishment circuit, a third two-position three-way reversing valve for controlling the opening and closing of the right hydraulic pump station suction port, and a fourth two-position three-way reversing valve for controlling the opening and closing of the right hydraulic pump station return port. The gear oil centralized oil replenishment circuit includes a second motor-pump unit, a gear oil refueling filter, and a gear oil refueling valve group device; The first load-sensitive proportional multi-way reversing valve comprises a left brake oil port, a hydraulic oil centralized oil replenishment port, a left rocker arm height adjustment cylinder A oil port, and a left rocker arm height adjustment cylinder B oil port. The left rocker arm height adjustment cylinder is connected to the first load-sensitive proportional multi-way reversing valve through the left rocker arm height adjustment cylinder A oil port and the left rocker arm height adjustment cylinder B oil port. The left brake is connected to the first load-sensitive proportional multi-way reversing valve through the left brake oil port. The hydraulic oil centralized oil replenishment circuit is connected to the first load-sensitive proportional multi-way reversing valve through the hydraulic oil centralized oil replenishment port. The second load-sensitive proportional multi-way reversing valve comprises a right brake oil port, a gear oil replenishing port, a right rocker arm height adjustment cylinder A oil port, and a right rocker arm height adjustment cylinder B oil port. The right rocker arm height adjustment cylinder is connected to the second load-sensitive proportional multi-way reversing valve through the right rocker arm height adjustment cylinder A oil port and the right rocker arm height adjustment cylinder B oil port. The right brake is connected to the second load-sensitive proportional multi-way reversing valve through the right brake oil port. The gear oil centralized oil replenishing circuit is connected to the second load-sensitive proportional multi-way reversing valve through the gear oil replenishing port. The hydraulically controlled two-position three-way stop-type reversing valve is a tubular installation structure, including a brake oil inlet, a brake oil return port, an oil outlet, and a hydraulic control port, wherein the brake oil inlet is connected to the left brake oil port of the first load-sensitive proportional multi-way reversing valve and the right brake oil port of the second load-sensitive proportional multi-way reversing valve, the brake oil return port is connected to the left hydraulic oil tank and the right hydraulic oil tank, and the oil outlet is connected to the left brake and the right brake; The first motor-pump unit in the hydraulic oil centralized oil replenishment circuit and the second motor-pump unit in the gear oil centralized oil replenishment circuit are both integrated structures of motors and pumps, including a pump suction port, a pump oil outlet, a motor oil outlet, and a motor oil inlet.

2. The double pump station hydraulic system of a coal mining machine suitable for a large-angle fully-mechanized mining face according to claim 1 is characterized in that: The first load-sensitive proportional multi-way reversing valve includes a tail piece, a second middle piece, a first middle piece, a first piece, a relief valve, an oil inlet, an oil drain port, and an oil return port, and the left brake oil port is arranged on the second middle piece of the first load-sensitive proportional multi-way reversing valve; the second load-sensitive proportional multi-way reversing valve includes a tail piece, a second middle piece, a first middle piece, a relief valve, an oil inlet, an oil drain port, and an oil return port, and the right brake oil port is arranged on the second middle piece of the second load-sensitive proportional multi-way reversing valve.

3. The double pump station hydraulic system of a coal mining machine suitable for a large-angle fully-mechanized mining face according to claim 1 is characterized in that: The left hydraulic oil tank and the right hydraulic oil tank are respectively embedded in the left traction transmission box and the right traction transmission box of the coal mining machine. The left hydraulic oil tank and the right hydraulic oil tank are provided with a temperature sensor, an oil level sensor, a centralized oil return cooling device, a pre-pressure air filter, an oil suction filter, and a liquid level gauge.

4. The double pump station hydraulic system of a coal mining machine suitable for a large-angle fully-mechanized mining face according to claim 3 is characterized in that: The pre-pressure air filter is composed of four parts: an air filter, an air intake check valve, an exhaust check valve and a refueling filter.

5. The double pump station hydraulic system of a coal mining machine suitable for a large-angle fully-mechanized mining face according to claim 3 is characterized in that: The left hydraulic oil tank and the right hydraulic oil tank further include a brake oil return interface, and the brake oil return port of the hydraulically controlled two-position three-way stop-type reversing valve is connected to the brake oil return interface.

6. The double pump station hydraulic system of a coal mining machine suitable for a large-angle fully-mechanized mining face according to claim 3 is characterized in that: The centralized oil return cooling device comprises a cooler, a cooler housing, a hydraulic system total oil return port, a cooling water inlet and a cooling water outlet.

7. The double pump station hydraulic system of a coal mining machine suitable for a large-angle fully-mechanized mining face according to claim 1 is characterized in that: The hydraulic oil refilling valve group device in the hydraulic oil centralized oil replenishment circuit includes a throttle valve, a hydraulic oil replenishment inlet, a banzhu block, a right hydraulic oil tank replenishment interface, and a left hydraulic oil tank replenishment interface. The hydraulic oil replenishment inlet is connected to the pump outlet of the first motor-pump unit.

8. The double pump station hydraulic system of a coal mining machine suitable for a fully mechanized mining face with a large dip angle according to claim 1, characterized in that: The gear oil refueling valve group device in the gear oil centralized oil replenishment circuit includes a throttle valve, a gear oil refueling inlet, a banjo block, a right planetary gearbox refueling interface, a right rocker arm gearbox refueling interface, a right traction gearbox refueling interface, a left traction gearbox refueling interface, a left rocker arm gearbox refueling interface, and a left planetary gearbox refueling interface, and the gear oil refueling inlet is connected to the pump oil outlet of the second motor-pump unit.

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