阅读说明：本技术 适用于大倾角综采工作面的采煤机的双泵站液压系统 (Double-pump-station hydraulic system of coal mining machine suitable for large-inclination-angle fully-mechanized mining face ) 是由 赵灵 李小朋 赵晓蔚 杨亚东 王雪松 费续东 宋景哲 陈于 段清泉 张凌燕 李瑞 于 2021-09-09 设计创作，主要内容包括：本发明公开了一种适用于大倾角综采工作面的采煤机的双泵站液压系统,包括左和右制动器液压回路、左和右液压泵站、第一和第二负载敏感式比例多路换向阀、第一、第二、第三和第四两位三通换向阀,左液压泵站包括左液压油箱、液压油集中补油回路,右液压泵站包括右液压油箱、齿轮油集中补油回路,液压油集中补油回路连接于第一负载敏感式比例多路换向阀,齿轮油集中补油回路连接于第二负载敏感式比例多路换向阀。本发明的双泵站液压系统结构紧凑,易实现智能集成化；实现制动器零压回油,确保制动器安全可靠运行；通过液压油集中补油回路以及齿轮油集中补油回路,可以自动、快速地为左右液压油箱补注液压油以及为采煤机各齿轮箱补注齿轮油。(The invention discloses a double-pump-station hydraulic system of a coal mining machine suitable for a large-dip-angle fully-mechanized mining face, which comprises 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, a second load-sensitive proportional multi-way reversing valve, a first two-position three-way reversing valve, a second two-position three-way reversing valve, a third two-position three-way reversing valve and a fourth two-position three-way reversing valve, wherein the left hydraulic pump station comprises a left hydraulic oil tank and a hydraulic oil centralized oil supplementing circuit, the right hydraulic pump station comprises a right hydraulic oil tank and a gear oil centralized oil supplementing circuit, the hydraulic oil centralized oil supplementing circuit is connected with the first load-sensitive proportional multi-way reversing valve, and the gear oil centralized oil supplementing circuit is connected with the second load-sensitive proportional multi-way reversing valve. The double-pump-station hydraulic system is compact in structure and easy to realize intelligent integration; zero-pressure oil return of the brake is realized, and safe and reliable operation of the brake is ensured; through the hydraulic oil centralized oil supplementing loop and the gear oil centralized oil supplementing loop, hydraulic oil can be automatically and quickly supplemented to the left hydraulic oil tank and the right hydraulic oil tank and gear oil can be automatically and quickly supplemented to each gear box of the coal mining machine.)

1. The utility model provides a double pump station hydraulic system suitable for coal-winning machine of big inclination is combined and is adopted working face, including left rocking arm heighten hydro-cylinder and with balance valve, right rocking arm heighten hydro-cylinder that left rocking arm heighten hydro-cylinder is connected and with the balance valve that right rocking arm heighten hydro-cylinder is connected, its characterized in that, double pump station hydraulic system suitable for big inclination is combined and is adopted working face's coal-winning machine still includes: left brake hydraulic circuit, right brake hydraulic circuit, left hydraulic power unit, right hydraulic power unit, the sensitive formula proportion multichannel switching-over valve of first load, the sensitive formula proportion multichannel switching-over valve of second load, wherein:

the left brake hydraulic loop comprises a left brake and a hydraulic control two-position three-way stop reversing valve; the right brake hydraulic loop comprises a right brake and a hydraulic control two-position three-way stop reversing valve;

the left hydraulic pump station comprises a left hydraulic oil tank, a first gear pump, a high-pressure filter connected with the first gear pump, a hydraulic oil centralized oil supplementing loop, a first two-position three-way reversing valve for controlling the opening and closing of an oil suction port of the left hydraulic pump station, and a second two-position three-way reversing valve for controlling the opening and closing of an oil return port of the left hydraulic pump station, wherein the hydraulic oil centralized oil supplementing loop comprises a first motor-pump unit, a hydraulic oil refueling filter and a hydraulic oil refueling valve group device;

the right hydraulic pump station comprises a right hydraulic oil tank, a second gear pump, a high-pressure filter connected to the second gear pump, a gear oil centralized oil supplementing loop, a third two-position three-way reversing valve for controlling the opening and closing of an oil suction port of the right hydraulic pump station, and a fourth two-position three-way reversing valve for controlling the opening and closing of an oil return port of the right hydraulic pump station, wherein the gear oil centralized oil supplementing loop comprises a second motor-pump unit, a gear oil adding filter and a gear oil adding valve group device;

the first load-sensitive proportional multi-way reversing valve comprises a left brake oil port, a hydraulic oil centralized oil supplementing port, a left rocker arm heightening oil cylinder A oil port and a left rocker arm heightening oil cylinder B oil port, the left rocker arm heightening oil cylinder is connected to the first load-sensitive proportional multi-way reversing valve through the left rocker arm heightening oil cylinder A oil port and the left rocker arm heightening oil 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, and the hydraulic oil centralized oil supplementing loop is connected to the first load-sensitive proportional multi-way reversing valve through the hydraulic oil centralized oil supplementing port;

the second load sensitive type proportional multi-way reversing valve comprises a right brake oil port, a gear oil supplementing oil port, a right rocker arm heightening oil cylinder A oil port and a right rocker arm heightening oil cylinder B oil port, the right rocker arm heightening oil cylinder passes through the right rocker arm heightening oil cylinder A oil port and the right rocker arm heightening oil cylinder B oil port and is connected with the second load sensitive type proportional multi-way reversing valve, the right brake passes through the right brake oil port and is connected with the second load sensitive type proportional multi-way reversing valve, and a gear oil centralized oil supplementing loop passes through the gear oil supplementing oil port and is connected with the second load sensitive type proportional multi-way reversing valve.

2. The dual-pump-station hydraulic system of the coal mining machine applicable to the large-inclination-angle fully-mechanized coal mining face according to claim 1, wherein the first load-sensitive proportional multi-way directional valve comprises a tail piece, a second middle piece, a first head piece, 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 piece of the first load-sensitive proportional multi-way directional valve; the second load-sensitive proportional multi-way reversing valve comprises a tail piece, a middle piece second piece, a middle piece first piece, a first piece, an overflow valve, an oil inlet, an oil drain port and an oil return port, wherein the right brake oil port is arranged on the middle piece second piece of the second load-sensitive proportional multi-way reversing valve.

3. The dual-pump-station hydraulic system of the coal mining machine applicable to the large-inclination fully-mechanized mining face of claim 1, wherein the hydraulic control two-position three-way cut-off directional control valve is a tubular installation structure and comprises 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 a left brake oil port of the first load-sensitive proportional multi-way directional control valve and a right brake oil port of the second load-sensitive proportional multi-way directional control 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.

4. The dual-pump-station hydraulic system of the coal mining machine suitable for the large-inclination fully-mechanized mining face of claim 3, wherein the left hydraulic oil tank and the right hydraulic oil tank are respectively embedded in a left traction transmission case and a right traction transmission case of the coal mining machine, and a temperature sensor, an oil level sensor, a concentrated return oil cooling device, a pre-pressurized air filter, an oil suction filter and a liquid level meter are arranged on the left hydraulic oil tank and the right hydraulic oil tank.

5. The dual-pump station hydraulic system of the coal mining machine suitable for the large-inclination fully-mechanized mining face according to claim 4, wherein the pre-compressed air filter is composed of four parts, namely an air filter, an air inlet one-way valve, an exhaust one-way valve and an oil filling filter.

6. The dual-pump-station hydraulic system of the coal mining machine applicable to the large-inclination fully-mechanized mining face according to claim 4, wherein the left hydraulic oil tank and the right hydraulic oil tank further comprise a brake oil return port, and a brake oil return port of the hydraulic control two-position three-way cut-off reversing valve is connected to the brake oil return port.

7. The dual-pump-station hydraulic system of the coal mining machine suitable for the fully mechanized mining face with the large inclination angle of claim 4, wherein the concentrated return oil cooling device comprises a cooler, a cooler housing, a hydraulic system main oil return port, a cooling water inlet and a cooling water outlet.

8. The dual-pump station hydraulic system of the coal mining machine applicable to the large-inclination fully-mechanized coal mining face according to claim 1, wherein the first motor-pump unit in the hydraulic oil centralized oil supplementing loop and the second motor-pump unit in the gear oil centralized oil supplementing loop are both integrated structures of a motor and a pump, and comprise a pump pumping port, a motor oil outlet and a motor oil inlet.

9. The dual-pump station hydraulic system of the coal mining machine applicable to the large-inclination fully-mechanized coal mining face according to claim 8, wherein the hydraulic oil refueling valve bank device in the hydraulic oil centralized oil recharging loop comprises a throttle valve, a hydraulic oil recharging oil inlet port, a spot-shaped block, a right hydraulic oil tank recharging oil port and a left hydraulic oil tank recharging oil port, and the hydraulic oil recharging oil inlet port is connected to the oil outlet port of the first motor-pump unit.

10. The dual-pump station hydraulic system of a coal mining machine applicable to a large-inclination fully-mechanized coal mining face according to claim 8, wherein the gear oil refueling valve bank device in the gear oil centralized oil recharging loop comprises a throttle valve, a gear oil recharging oil inlet, a spot upper block, a right planetary gear box refueling interface, a right rocker arm gear box refueling interface, a right traction gear box refueling interface, a left rocker arm gear box refueling interface, and a left planetary gear box refueling interface, and the gear oil recharging oil inlet is connected to the oil outlet of the second motor-pump unit.

Technical Field

The invention belongs to the technical field of coal mine excavation machinery, and relates to a double-pump station hydraulic system of a coal mining machine suitable for a large-inclination fully-mechanized mining face.

Background

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

The coal mining machine hydraulic system in the prior art is unreasonable in configuration and low in integration and intelligence degree; the brake has the conditions of time delay, unstable braking and the like; the problems of damage to air suction of the height-adjusting pump and low operation reliability of the height-adjusting hydraulic system commonly exist; the field maintenance is difficult, and the production efficiency is low. More specifically, the hydraulic system of the prior art, which is suitable for the coal mining machine with a large inclination angle fully mechanized mining face, has the following disadvantages and shortcomings:

1. the hydraulic system has the advantages of large occupied space, low integration degree, dispersed installation of all components, overlong pressure oil pipeline and more hidden control troubles, and cannot meet the development requirements of compact structure, reliable braking, powerful function and high integration intelligent degree of the hydraulic system of the coal mining machine on site.

2. In practical application, a brake control mode is that pressure oil is obtained from a branch branched from a pump station, then an electromagnetic valve and a pressure reducing valve are arranged for control, and then the pressure oil enters a brake, specifically, as shown in a region I which shows the working principle of the existing brake in figure 1, the brake control mode is complex, large in occupied space, multiple in middle pipelines, unsmooth in oil return, large in back pressure, unreliable in operation, long in delay response time, unstable in braking and the like.

3. The hydraulic oil tank is a single integral oil tank, the occupied space is large independently, the overall dimension of the element is large, and high integration among all components is not facilitated; in application practice, in order to meet the actual coal mining requirement of a large-inclination-angle working face, a hydraulic oil tank needs to be lengthened and heightened, and meanwhile, in order to solve the problem of oil leakage of a vent plug, the vent plug needs to be heightened and installed; the oil absorption filter arranged in the hydraulic oil tank cannot be ideally arranged, and the oil absorption of the hydraulic oil tank of the coal mining machine for mining the large-inclination-angle working face becomes a prominent problem in the actual use process. The oil suction device of the hydraulic oil tank of the coal mining machine cannot simultaneously meet the normal oil suction requirement when the left working surface and the right working surface have large inclination angles. Particularly, in the mining use of a thin coal seam with a large inclination angle, the common problems of air suction damage of a height adjusting pump of a coal mining machine and abnormal operation of a height adjusting hydraulic system are solved.

4. The maintenance and difficulty of the equipment under the condition of the large-inclination-angle thin coal seam are too long, the local thin coal seam working face possibly causes the large sinking amount of the top plate, serious potential safety hazards of mining exist, the mining speed is seriously influenced, the production efficiency is greatly reduced, and the quick and convenient maintenance of a hydraulic system needs to be considered. Specifically, for example, as shown in a region II in fig. 1, which shows the working principle of the existing centralized-filling gear oil system, a centralized-filling hydraulic oil system is absent, and a worker is required to manually fill hydraulic oil during actual work.

Disclosure of Invention

Therefore, with the requirements of high reliability and intellectualization of the coal mining machine, the coal mining machine has larger power, more and more functions and higher requirements on the adaptability of the coal bed, and correspondingly, higher requirements on a hydraulic system are provided. Therefore, the hydraulic system is required to be designed to be more exquisite and compact, reliable in braking, powerful in function, high in intelligent degree and highly integrated so as to reduce the occupied space of the oil tank as much as possible and thoroughly solve the problem of gear pump air suction in the working process; the problem of reliable and stable braking of the coal mining machine is solved practically; the problem of quick convenient maintenance of hydraulic system is solved in order to improve production efficiency.

In order to solve some or all of the technical problems, the invention provides a double-pump-station hydraulic system of a coal mining machine suitable for a large-inclination-angle fully-mechanized mining face, which comprises a left rocker arm heightening oil cylinder, a balance valve connected with the left rocker arm heightening oil cylinder, a right rocker arm heightening oil cylinder and a balance valve connected with the right rocker arm heightening oil cylinder, and the double-pump-station hydraulic system of the coal mining machine suitable for the large-inclination-angle fully-mechanized mining face further comprises: left brake hydraulic circuit, right brake hydraulic circuit, left hydraulic power unit, right hydraulic power unit, the sensitive formula proportion multichannel switching-over valve of first load, the sensitive formula proportion multichannel switching-over valve of second load, wherein:

the left brake hydraulic loop comprises a left brake and a hydraulic control two-position three-way stop reversing valve; the right brake hydraulic loop comprises a right brake and a hydraulic control two-position three-way stop reversing valve;

the left hydraulic pump station comprises a left hydraulic oil tank, a first gear pump, a high-pressure filter connected with the first gear pump, a hydraulic oil centralized oil supplementing loop, a first two-position three-way reversing valve for controlling the opening and closing of an oil suction port of the left hydraulic pump station, and a second two-position three-way reversing valve for controlling the opening and closing of an oil return port of the left hydraulic pump station, wherein the hydraulic oil centralized oil supplementing loop comprises a first motor-pump unit, a hydraulic oil refueling filter and a hydraulic oil refueling valve group device;

the right hydraulic pump station comprises a right hydraulic oil tank, a second gear pump, a high-pressure filter connected to the second gear pump, a gear oil centralized oil supplementing loop, a third two-position three-way reversing valve for controlling the opening and closing of an oil suction port of the right hydraulic pump station, and a fourth two-position three-way reversing valve for controlling the opening and closing of an oil return port of the right hydraulic pump station, wherein the gear oil centralized oil supplementing loop comprises a second motor-pump unit, a gear oil adding filter and a gear oil adding valve group device;

the first load-sensitive proportional multi-way reversing valve comprises a left brake oil port, a hydraulic oil centralized oil supplementing port, a left rocker arm heightening oil cylinder A oil port and a left rocker arm heightening oil cylinder B oil port, the left rocker arm heightening oil cylinder is connected to the first load-sensitive proportional multi-way reversing valve through the left rocker arm heightening oil cylinder A oil port and the left rocker arm heightening oil 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, and the hydraulic oil centralized oil supplementing loop is connected to the first load-sensitive proportional multi-way reversing valve through the hydraulic oil centralized oil supplementing port;

the second load sensitive type proportional multi-way reversing valve comprises a right brake oil port, a gear oil supplementing oil port, a right rocker arm heightening oil cylinder A oil port and a right rocker arm heightening oil cylinder B oil port, the right rocker arm heightening oil cylinder passes through the right rocker arm heightening oil cylinder A oil port and the right rocker arm heightening oil cylinder B oil port and is connected with the second load sensitive type proportional multi-way reversing valve, the right brake passes through the right brake oil port and is connected with the second load sensitive type proportional multi-way reversing valve, and a gear oil centralized oil supplementing loop passes through the gear oil supplementing oil port and is connected with the second load sensitive type proportional multi-way reversing valve.

Further, in the above-mentioned double-pump-station hydraulic system of a coal mining machine suitable for a large-inclination fully-mechanized mining face, the first load-sensitive proportional multi-way directional valve includes a tail piece, a middle piece second piece, a middle piece first piece, a first piece, an overflow valve, an oil inlet, an oil drain port, and an oil return port, and the left brake oil port is disposed on the middle piece second piece of the first load-sensitive proportional multi-way directional valve; the second load-sensitive proportional multi-way reversing valve comprises a tail piece, a middle piece second piece, a middle piece first piece, a first piece, an overflow valve, an oil inlet, an oil drain port and an oil return port, wherein the right brake oil port is arranged on the middle piece second piece of the second load-sensitive proportional multi-way reversing valve.

Further, in the above-mentioned double-pump-station hydraulic system of a coal mining machine that is suitable for a large-inclination fully-mechanized mining face, the hydraulic control two-position three-way stop-type directional control valve is a tubular mounting structure, and includes 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 directional control valve and the right brake oil port of the second load-sensitive proportional multi-way directional control 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.

Further, in the above-mentioned double-pump-station hydraulic system of a coal mining machine suitable for a large-inclination fully-mechanized mining face, the left hydraulic oil tank and the right hydraulic oil tank are respectively embedded in a left traction transmission case and a right traction transmission case of the coal mining machine, and a temperature sensor, an oil level sensor, a concentrated return oil cooling device, a pre-pressurized air filter, an oil suction filter and a liquid level meter are arranged on the left hydraulic oil tank and the right hydraulic oil tank.

Further, in the double-pump station hydraulic system of the coal mining machine suitable for the large-inclination fully-mechanized mining face, the pre-pressing type air filter is composed of an air filter, an air inlet one-way valve, an exhaust one-way valve and an oiling filter.

Further, in the above-mentioned double-pump-station hydraulic system of a coal mining machine suitable for a large-inclination fully-mechanized mining face, the left hydraulic oil tank and the right hydraulic oil tank further include a brake oil return port, and a brake oil return port of the hydraulic control two-position three-way stop reversing valve is connected to the brake oil return port.

Further, in the above-mentioned double-pump-station hydraulic system of a coal mining machine suitable for a large-inclination fully-mechanized mining face, the concentrated return oil cooling device includes a cooler, a cooler housing, a hydraulic system main oil return port, a cooling water inlet, and a cooling water outlet.

Further, in the above dual-pump station hydraulic system for a coal mining machine suitable for a large-inclination fully-mechanized mining face, the first motor-pump unit in the hydraulic oil centralized oil supplementing loop and the second motor-pump unit in the gear oil centralized oil supplementing loop are both integrated structures of a motor and a pump, and include a pump suction port, a pump discharge port, a motor oil outlet, and a motor oil inlet.

Further, in the above dual-pump-station hydraulic system of a coal mining machine suitable for a large-inclination fully-mechanized mining face, the hydraulic oil refueling valve group device in the hydraulic oil centralized oil recharging loop includes a throttle valve, a hydraulic oil recharging oil inlet, a patch block, a right hydraulic oil tank recharging oil interface, and a left hydraulic oil tank recharging oil interface, and the hydraulic oil recharging oil inlet is connected to the oil outlet of the first motor-pump unit.

Further, in the above-mentioned double-pump-station hydraulic system for a coal mining machine suitable for a large-inclination fully-mechanized mining face, the gear oil refueling valve group device in the gear oil centralized oil recharging circuit includes a throttle valve, a gear oil recharging oil inlet, a spot upper and lower block, a right planetary gear box refueling interface, a right rocker arm gear box refueling interface, a right traction gear box refueling interface, a left rocker arm gear box refueling interface, and a left planetary gear box refueling interface, and the gear oil recharging oil inlet is connected to the oil outlet of the pump of the second motor-pump unit.

The double-pump-station hydraulic system of the coal mining machine suitable for the large-inclination fully-mechanized mining face has the main technical effects that:

two independent small hydraulic oil tanks embedded in the idle cavities of the left traction transmission case and the right traction transmission case are adopted, so that the structure is compact, the maintenance is convenient, the components are miniaturized, and the intelligent integration is easy to realize;

the secondary pressure regulation control brake of the load-sensitive proportional multi-way reversing valve is fully utilized, pressure oil is directly and intensively obtained, the space is greatly saved, the pressure difference control of the hydraulic control two-position three-way stop reversing valve is utilized to eliminate the back pressure influence, an oil return pipeline of the brake is directly and independently returned to the hydraulic oil tank, zero-pressure oil return is really realized, and the safe and reliable operation of the brake is ensured;

according to the size of the actual mining working face inclination angle and the oil level data of the hydraulic oil tank, the two-position three-way reversing valve can intelligently control and switch the opening and closing of the oil suction/return oil paths of the left hydraulic pump station and the right hydraulic pump station respectively. In addition, the pre-pressing air filter arranged at the upper part of the hydraulic oil tank improves the self-absorption capacity of the gear pump under the condition of complex working conditions, maintains the stability of liquid in the oil tank and avoids the possible faults of air absorption and the like of the gear pump caused by oscillation or disturbance of the liquid in the oil tank;

through the hydraulic oil centralized oil supplementing loop and the gear oil centralized oil supplementing loop, hydraulic oil can be automatically and quickly supplemented to the left hydraulic oil tank and the right hydraulic oil tank and gear oil can be automatically and quickly supplemented to each gear box of the coal mining machine, and the defects of high labor intensity, complex operation, low production efficiency and the like caused by manual oil supplementing under the condition of a fully mechanized mining face of a large-dip-angle coal seam are overcome.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts. In the drawings:

fig. 1 is a schematic diagram of a hydraulic system of a coal mining machine suitable for a large-inclination fully mechanized mining face in the prior art;

FIG. 2 is a schematic diagram of the construction of the dual pump station hydraulic system of the shearer for large-inclination fully mechanized mining face of the present invention;

fig. 3a and 3b are schematic structural 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 large-inclination fully-mechanized mining face, respectively, according to the invention;

FIG. 4 is a schematic structural diagram of a hydraulic control two-position three-way stop reversing valve in a double-pump station hydraulic system of a coal mining machine suitable for a large-inclination fully-mechanized mining face according to the invention;

FIG. 5 is a schematic diagram of the left and right hydraulic oil tanks in the dual-pump station hydraulic system of the shearer for large-inclination fully mechanized mining face according to the present invention;

fig. 6a and 6b are schematic structural diagrams of a centralized oil return cooling device in a double-pump station hydraulic system of a coal mining machine suitable for a large-inclination fully mechanized mining face, wherein fig. 6b is a side view of fig. 6 a;

fig. 7a, 7b and 7c are schematic structural views of a first motor-pump unit and a second motor-pump unit in a dual-pump station hydraulic system of a shearer for large-inclination fully mechanized mining faces of the present invention, wherein fig. 7a and 7c are side views of fig. 7 b;

fig. 8 is a schematic structural diagram of a hydraulic oil filling valve group device in a double-pump station hydraulic system of a coal mining machine suitable for a large-inclination fully-mechanized mining face;

fig. 9 is a schematic structural 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-inclination fully-mechanized mining face.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 2, the double-pump station hydraulic system of the coal mining machine suitable for the fully mechanized mining face with large inclination angle of the invention comprises: the hydraulic control system comprises a left rocker arm heightening oil cylinder 1, a balance valve 2 connected with the left rocker arm heightening oil cylinder 1, a right rocker arm heightening oil cylinder 3, a balance valve 2 connected with the right rocker arm heightening oil 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 type proportional multi-way reversing valve 27 and a second load sensitive type proportional multi-way reversing valve 49.

The left brake hydraulic circuit I comprises a left brake 11, a pressure instrument 5, a hydraulic control two-position three-way stop reversing valve 25 and a low pressure sensor 26. The right brake hydraulic circuit II includes a right brake 12, a pressure meter 5, a hydraulic control two-position three-way cut-off type directional valve 25, and a low pressure sensor 26.

The left hydraulic pump station III comprises 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 supplementing loop III.1, a first two-position three-way reversing valve 33 used for controlling the opening and closing of an oil suction port of the left hydraulic pump station III, and a second two-position three-way reversing valve 51 used for controlling the opening and closing of an oil return port of the left hydraulic pump station III. The left hydraulic tank 34 is provided with a temperature sensor 37, a fuel level sensor 38, a concentrated return oil cooling device 35, a pre-compressed air cleaner 36, an oil suction filter 16, and a liquid level gauge 18. The first gear pump 17 is provided with a first pump station motor 24 and a high pressure sensor 31 in a matching way. The hydraulic oil centralized oil supply loop iii.1 includes a first motor-pump unit 22, a hydraulic oil filling filter 32, and a hydraulic oil filling valve group device 30.

The right hydraulic pump station IV comprises 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 supplementing loop iv.1, a third two-position three-way reversing valve 39 for controlling the opening and closing of an oil suction port of the right hydraulic pump station IV, and a fourth two-position three-way reversing valve 52 for controlling the opening and closing of an oil return port of the right hydraulic pump station IV. The right hydraulic oil tank 43 is provided with a temperature sensor 37, an oil level sensor 38, a concentrated return oil cooling device 35, a pre-compression air cleaner 36, an oil suction filter 16, and a liquid level gauge 18. The second gear pump 44 is provided with a second pump station motor 45 and a high pressure sensor 31 in a matching way. The gear oil centralized oil supply loop IV.1 comprises a second motor-pump unit 46, a gear oil filling filter 21 and a gear oil filling valve group device 42.

The first load-sensitive proportional multi-way directional control valve 27 comprises a left brake oil port 28, a hydraulic oil centralized oil supplementing port 29, a left rocker arm heightening oil cylinder A oil port 47 and a left rocker arm heightening oil cylinder B oil port 48. The second load-sensitive proportional multi-way directional control valve 49 includes a right brake port 40, a gear oil supply port 41, a right rocker arm heightening cylinder a port 59, and a right rocker arm heightening cylinder B port 60. The left rocker heightening oil cylinder 1 is connected to the first load-sensitive proportional multi-way reversing valve 27 through an oil port A47 of the left rocker heightening oil cylinder and an oil port B48 of the left rocker heightening oil cylinder, and the right rocker heightening oil cylinder 3 is connected to the second load-sensitive proportional multi-way reversing valve 49 through an oil port A59 of the right rocker heightening oil cylinder and an oil port B60 of the right rocker heightening oil cylinder. The left brake 11 is connected to the first load-sensitive proportional multi-way directional valve 27 through a left brake oil port 28, and the right brake 12 is connected to the second load-sensitive proportional multi-way directional valve 49 through a right brake oil port 40. The hydraulic oil centralized oil supplementing loop III.1 is connected to the first load-sensitive proportional multi-way reversing valve 27 through a hydraulic oil centralized oil supplementing port 29, and the gear oil centralized oil supplementing loop IV.1 is connected to the second load-sensitive proportional multi-way reversing valve 49 through a gear oil supplementing port 41.

Specifically, as shown in fig. 3a and 3b, fig. 3a shows the structure of the first load-sensitive proportional multi-way directional valve 27, and fig. 3b shows the structure of the second load-sensitive proportional multi-way directional valve 49. The first load-sensitive proportional multi-way directional control valve 27 comprises a tail piece 53, a middle piece second piece 54, a middle piece first piece 55, a head piece 56, an overflow valve 57, an oil inlet 58, a left brake oil port 28, a hydraulic oil centralized oil supplementing port 29, a left rocker arm heightening oil cylinder A oil port 47, a left rocker arm heightening oil cylinder B oil port 48, an oil drainage port 61 and an oil return port 62. The second load-sensitive proportional multi-way directional valve 49 has the same structure as the first load-sensitive proportional multi-way directional valve 27, and includes a tail piece 53, a middle piece second piece 54, a middle piece first piece 55, a first piece 56, an overflow valve 57, an oil inlet 58, a right brake oil port 40, a gear oil supply port 41, a right rocker heightening oil cylinder a port 59, a right rocker heightening oil cylinder B port 60, an oil drain port 61, and an oil return port 62.

As described above, the double-pump-station hydraulic system of the coal mining machine applicable to the fully mechanized mining face with a large inclination angle of the present invention improves the structure of the braking system in the prior art, eliminates the structures of complicated control, large occupied space, long middle pipeline, unsmooth oil return, large back pressure, unreliable operation and the like caused by branch oil extraction, electromagnetic valves, pressure reducing valves and the like, and directly and intensively obtains pressure oil by using the left brake oil port 28/the right brake oil port 40 arranged on the second piece of the middle piece of the first load-sensitive proportional multi-way reversing valve 27/the second load-sensitive proportional multi-way reversing valve 49, and then enters the left brake 11/the right brake 12 through the two-position three-way hydraulic control stop reversing valve 25. Specifically, as shown in fig. 4, the hydraulic control two-position three-way stop-type directional control valve 25 is a tubular installation structure, and includes a brake oil inlet 63, a brake oil return 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 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.

The middle piece of the first load sensitive type proportional multi-way reversing valve 27/the second load sensitive type proportional multi-way reversing valve 49 has the functions of controlling oil circuit and adjusting pressure for the second time, moreover, the hydraulic control two-position three-way stop type reversing valve 25 hydraulically controls the reversing mode, the internal pressure is balanced, the pressure born by each oil port is equal, when the valve does not operate, the valve reset by the spring can automatically return to the zero position or the middle position, the operation is reliable, and zero leakage exists. Therefore, the double-pump-station hydraulic system of the coal mining machine suitable for the large-dip-angle fully-mechanized mining face fully utilizes the secondary pressure regulation control braking of the load-sensitive proportional multi-way reversing valves 27 and 49 and directly and intensively obtains pressure oil, greatly saves space, utilizes the pressure difference control of the hydraulic control two-position three-way stop reversing valve 25 to eliminate back pressure influence, directly and independently returns oil return pipelines of the left brake 11 and the right brake 12 to the left hydraulic oil tank 34 and the right hydraulic oil tank 43 respectively, really realizes zero-pressure oil return, and ensures safe and reliable operation of the brakes.

As described above, the double-pump station hydraulic system of the shearer for the fully mechanized mining face with a large inclination angle of the present invention splits a whole large oil tank in the prior art into two small hydraulic oil tanks which are independent from each other, namely the left hydraulic oil tank 34 and the right hydraulic oil tank 43. In the invention, the left hydraulic oil tank 34 and the right hydraulic oil tank 43 are respectively embedded in a left traction transmission box and a right traction transmission box of the coal mining machine, so that the vacant and idle cavity space of the equipment traction box body is fully utilized. Moreover, under normal conditions, the left hydraulic oil tank 34 and the right hydraulic oil tank 43 respectively and independently operate and control to provide power for the heightening of the left rocker arm and the right rocker arm of the coal mining machine, the left rocker arm heightening oil cylinder 1 and the right rocker arm heightening oil cylinder 3 can be respectively and independently controlled without influencing each other, and the independent action of the left rocker arm and the independent action of the right rocker arm can be realized, and the simultaneous action of the left rocker arm and the right rocker arm can also be realized.

The left hydraulic oil tank 34 and the right hydraulic oil tank 43 have the same structure, and as shown in fig. 5 in particular, the left hydraulic oil tank 34 and the right hydraulic oil tank 43 include a brake oil return interface 50 and an oil discharge plug 67 in addition to the above-mentioned concentrated oil return cooling device 35, the pre-pressure air cleaner 36 and the oil suction filter 16, and a brake oil return port 64 of the hydraulic control two-position three-way stop-type directional control valve 25 is connected to the brake oil return interface 50, so that 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.

The concentrated return oil cooling device 35 disposed in the left and right hydraulic oil tanks 34 and 43 is used for cooling the oil in the left and right hydraulic oil tanks 34 and 43, and as shown in fig. 6a and 6b, the concentrated return oil cooling device 35 includes a cooler 68, a cooler housing 69, a hydraulic system main return port 70, a cooling water inlet 71, and a cooling water outlet 72. By the centralized return oil cooling device 35 in the double-pump station hydraulic system of the coal mining machine suitable for the large-inclination fully-mechanized mining face, all return oil of the hydraulic system intensively enters the cooler shell 69 through the main oil return port 70 of the hydraulic system and is intensively cooled by the cooler 68. In addition, the design of defoaming, precipitating and filtering structures is carried out at the tail end of the cooler shell 69, so that all return oil of the hydraulic system is intensively cooled by the return oil cooling device 35, and then is defoamed, precipitated and filtered at the tail end, and finally enters the left hydraulic oil tank 34 and the right hydraulic oil tank 43, so that foam and impurities generated by a large amount of return oil of the hydraulic system are greatly avoided, the instability of the hydraulic system caused by the fact that foam air and impurities are sucked by the oil suction filter 16 is avoided, the quality of oil products flowing back into the hydraulic oil tanks is ensured, and the good operation of the hydraulic system is ensured.

As described above, the hydraulic oil centralized oil supplementing loop iii.1 and the gear oil centralized oil supplementing loop iv.1 are provided in the dual-pump station hydraulic system of the coal mining machine applicable to the fully mechanized mining face with a large inclination angle, the hydraulic oil centralized oil supplementing loop iii.1 is used for supplementing hydraulic oil to the left hydraulic oil tank 34 and the right hydraulic oil tank 43, and the gear oil centralized oil supplementing loop iv.1 is used for supplementing gear oil to each gear box of the coal mining machine.

The first motor-pump unit 22 in the hydraulic oil centralized oil supply circuit iii.1 and the second motor-pump unit 46 in the gear oil centralized oil supply circuit iv.1 are identical in structure, and as shown in fig. 7a, 7b and 7c, each of the two units is an integrated structure of a motor and a pump, and includes a pump suction port 73 and a pump discharge port 74 at 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 at the other side end of the first motor-pump unit 22/the second motor-pump unit 46, and further, the first motor-pump unit 22/the second motor-pump unit 46 further includes an oil drain port 75 and a peep port 76 provided on a structural body thereof.

As shown in fig. 8, the hydraulic oil filling valve assembly device 30 in the hydraulic oil centralized oil supplementing loop iii.1 includes a throttle valve 79, a hydraulic oil supplementing oil inlet 89, a patch 80, a right hydraulic oil tank oil supplementing interface 81, and a left hydraulic oil tank oil supplementing interface 82. The hydraulic oil supply inlet port 89 is connected to the pump outlet port 74 of the first motor-pump unit 22, whereby hydraulic oil is supplied to the right hydraulic oil tank 43 and the left hydraulic oil tank 34 through the right hydraulic oil tank supply port 81 and the left hydraulic oil tank supply port 82. It is specifically stated herein that, throughout the present application, banjo blocks refer to articulated rotatable pipe joints used for pipe connections in hydraulic systems.

As shown in fig. 9, the gear oil filling valve set device 42 in the gear oil centralized oil filling loop iv.1 includes a throttle valve 79, a gear oil filling oil inlet 90, a pin block 80, a right planetary gear box filling interface 83, a right rocker arm gear box filling interface 84, a right traction gear box filling interface 85, a left traction gear box filling interface 86, a left rocker arm gear box filling interface 87, and a left planetary gear box filling interface 88. The gear oil feeding inlet port 90 is connected to the pump outlet port 74 of the second motor-pump unit 46, whereby gear oil is fed to the respective gear boxes of the shearer through the right planetary gear box feeding port 83, the right rocker arm gear box feeding port 84, the right traction gear box feeding port 85, the left traction gear box feeding port 86, the left rocker arm gear box feeding port 87, and the left planetary gear box feeding port 88.

The plug-in throttle valves 79 provided in the hydraulic oil filling valve group device 30 and the gear oil filling valve group device 42 can control the throttling or shutoff of each oil supply branch flow. Therefore, the centralized refilling of the left hydraulic oil tank 34 and the right hydraulic oil tank 43 and the centralized refilling of the gear oil for each gear box of the coal mining machine are realized through the first motor-pump unit 22 and the hydraulic oil filling valve bank device 30 in the hydraulic oil centralized oil supplementing circuit iii.1, the second motor-pump unit 46 and the gear oil filling valve bank device 42 in the gear oil centralized oil supplementing circuit iv.1, and the plug-in throttle valve 79 configured for the hydraulic oil filling valve bank device 30 and the gear oil filling valve bank device 42.

As described above, the double-pump-station hydraulic system of the coal mining machine applicable to the fully mechanized mining face with a large inclination angle of the invention is provided with the first two-position three-way reversing valve 33 and the second two-position three-way reversing valve 51 for controlling the opening and closing of the oil path of the left hydraulic pump station III, and the third two-position three-way reversing valve 39 and the fourth two-position three-way reversing valve 52 for controlling the opening and closing of the oil path of the right hydraulic pump station IV. Therefore, according to the size of the actual mining working face inclination angle detected by the inclination angle sensor configured on the coal mining machine and the oil level data monitored by the oil level sensor 38 arranged on the left hydraulic oil tank 34 and the right hydraulic oil tank 43 in real time, the first two-position three-way reversing valve 33, the second two-position three-way reversing valve 51, the third two-position three-way reversing valve 39 and the fourth two-position three-way reversing valve 52 can intelligently control and switch the opening and closing of the oil absorption/return oil paths of the left hydraulic pump station III and the right hydraulic pump station IV respectively, namely: when the left hydraulic oil tank 34 is about to be empty, the oil absorption and oil return pipeline of the left hydraulic pump station III is switched to the right hydraulic oil tank 43 by the first two-position three-way reversing valve 33 and the second two-position three-way reversing valve 51 to absorb oil and return oil; similarly, when the right hydraulic oil tank 43 is about to be empty, the oil suction and return pipeline of the right hydraulic pump station IV is switched to the left hydraulic oil tank 34 by the third two-position three-way reversing valve 39 and the fourth two-position three-way reversing valve 52 to suck oil and return oil; when the actual mining working face inclination angle is recovered to the normal inclination angle, the communicated oil circuit of the left hydraulic pump station III and the right hydraulic pump station IV is cut off, and the independent operation control of the left hydraulic pump station III and the right hydraulic pump station IV is recovered without mutual influence.

Furthermore, as described above, the left hydraulic oil tank 34 and the right hydraulic oil tank 43 are provided with the pre-pressure air cleaner 36, and the pre-pressure air cleaner 36 is composed of four parts, namely, an air filter, an intake check valve, an exhaust check valve, and a refueling filter. When the hydraulic system works, the liquid level in the hydraulic oil tank rises or falls at intervals, when the liquid level falls, the prepressing type air filter 36 sucks air, the air automatically enters the air inlet one-way valve through the air filter screen and then enters the hydraulic oil tank, at the moment, the pressure in the hydraulic oil tank is smaller than the prepressing pressure, the exhaust one-way valve is in a closed state, the preset pressure in the hydraulic oil tank can be kept, the self-priming capability of the first gear pump 17 and the second gear pump 44 under the complex working condition is improved, the stability of the oil in the hydraulic oil tank is maintained, and the possible air suction and other faults of the gear pump caused by oscillation or disturbance of the oil in the hydraulic oil tank are avoided; when the liquid level rises due to return oil flowing back to the hydraulic oil tank after the working cycle, the temperature of the working oil is also increased, oil mist gas is generated and the pressure in the hydraulic oil tank is increased, when the pressure in the hydraulic oil tank is higher than the preset pressure, the exhaust check valve automatically opens to exhaust outwards, and when the pressure in the hydraulic oil tank is equal to the preset pressure, the exhaust check valve automatically closes, so that the preset pressure in the hydraulic oil tank can be maintained. The reciprocating circulation can not only play a role in protecting the normal work of a hydraulic system, promote the oil absorption efficiency, but also prolong the working period and the service life of oil and elements.

In summary, compared with the prior art, the double-pump station hydraulic system of the coal mining machine suitable for the large-inclination fully-mechanized mining face has the following advantages and beneficial effects:

1. double pump station arrangement

The hydraulic system divides an integral large oil tank into two small hydraulic oil tanks which are independent from each other, and the idle cavities of the left traction transmission box and the right traction transmission box are used as oil tanks, so that a machine body does not need to be lengthened, and the space is saved by more than 15 percent compared with the design of the existing oil tanks; the left hydraulic oil tank and the right hydraulic oil tank are designed in an integrated manner, are embedded in the left traction transmission box and the right traction transmission box, are integrated with the traction transmission box, and have compact structure and convenient maintenance; the miniaturization of main components realizes high intelligent integration very easily.

2. Brake device

The brake pressure oil in the hydraulic system is taken from a brake oil port of a second intermediate plate of the load-sensitive proportional multi-way reversing valve, and the intermediate plate has the functions of controlling an oil way and secondarily regulating pressure; a hydraulic control two-position three-way stop reversing valve is arranged in front of the brake, the valve is installed in a conical seat valve and a tubular mode, the reversing mode is controlled hydraulically, the pressure born by each oil port is equal due to the balance of the internal pressure, and when the valve does not operate, the valve reset by a spring can automatically return to a zero position or a middle position. The hydraulic system of the invention fully utilizes the secondary pressure regulation control brake of the load-sensitive proportional multi-way reversing valve and directly and intensively obtains pressure oil, greatly saves space, utilizes the pressure difference control of the hydraulic control two-position three-way stop reversing valve to eliminate back pressure influence, directly and independently returns an oil return pipeline of the brake to the hydraulic oil tank, really realizes zero-pressure oil return, and ensures safe and reliable operation of the brake.

3. Gear pump oil suction

In the hydraulic system, the two-position three-way reversing valve can intelligently control and switch the opening and closing of the oil suction/return oil paths of the left hydraulic pump station III and the right hydraulic pump station IV respectively according to the size of the inclination angle of the actual mining working face and the oil level data of the hydraulic oil tank. In addition, the pre-pressing air filter arranged at the upper part of the hydraulic oil tank simplifies the structure of the oil tank, is beneficial to the purification of oil, improves the self-absorption capacity of the gear pump under the condition of complex working conditions, maintains the stability of liquid in the oil tank, avoids the possible air absorption and other faults of the gear pump caused by the oscillation or disturbance of the liquid in the oil tank, can protect the normal working function of a hydraulic system, and can prolong the working period and the service life of the oil and elements.

4. Centralized refueling

In the hydraulic system, the hydraulic oil centralized oil supplementing loop III.1 and the gear oil centralized oil supplementing loop IV.1 can automatically, massively and quickly supplement hydraulic oil for the left hydraulic oil tank and the right hydraulic oil tank and supplement gear oil for each gear box of the coal mining machine, and the defects of high labor intensity, complex operation, low production efficiency and the like caused by manual oil supplementing under the condition of a fully mechanized mining working surface of a large-inclination angle coal seam are overcome.

5. Centralized return oil cooling

In the hydraulic system, the oil return pipeline in the hydraulic oil tank is provided with the concentrated oil return cooling device, all oil return of the hydraulic system is concentrated to enter the cooler shell through the main oil return port of the hydraulic system, and is concentrated and cooled by the cooler. The concentrated oil return cooling device has the advantages of compact structure, high pressure resistance, high heat dissipation efficiency, good effect, difficult blockage and extremely convenient maintenance.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.

Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.