WO2016074509A1

WO2016074509A1 - Hydraulic control system of fully-hydraulic drill type coal mining machine

Info

Publication number: WO2016074509A1
Application number: PCT/CN2015/086598
Authority: WO
Inventors: 刘送永; 姬会福; 杜长龙; 李建平; 刘晓辉; 杨道龙; 纪云; 孟德远
Original assignee: 中国矿业大学
Priority date: 2014-11-13
Filing date: 2015-08-11
Publication date: 2016-05-19
Also published as: CN104533856B; CN104533856A; ZA201604911B

Abstract

A hydraulic control system of a fully-hydraulic drill type coal mining machine comprises a drilling system, a walking system, a propulsion system and an auxiliary system. The drilling system is controlled in a closed-loop manner by a load-sensitive variable pump and an electro-hydraulic proportional valve (7), the system pressure and the flow can be automatically adjusted on the basis of load changes; and the drilling speed and the position of a drill rod can be controlled in real time. The walking system and the drilling system share one variable dual-piston pump (5), and the complexity of the system and the space of the system can be effectively reduced. The propulsion system adopts a speed-regulating valve (23) to regulate the speed and the propulsion speed is adjusted according to the operating condition to realize the cut of a drilling machine in maximum efficiency. The auxiliary system can achieve the support of a working platform of the drilling machine, the slope adjustment of the platform, the conveying of the drill rod and the clamping of the drill rod, can adjust the working angle of the drilling machine, and can position the drill rod when the replacement of the drill rod is completed. The drawbacks that the oil circuit of the hydraulic system of an existing hydraulic drill type coal mining machine is complex, that the accurate control of the drill rod is difficultly achieved, that the efficiency of the system is low, and that the auxiliary work and the replacement of the drill rod take long time, are solved.

Description

Full hydraulic drill type shearer hydraulic control system

Technical field

The invention relates to a hydraulic control system for a mining equipment, in particular to a hydraulic control system for a full hydraulic drill type shearer suitable for mining equipment of thin and extremely thin coal seams.

Background technique

China's thin and extremely thin coal seams are rich in reserves and widely distributed. With the large-scale mining of medium-thick coal seams, thin and thin coal seam mining has increasingly become an urgent problem to be solved. At present, the degree of mechanization of thin and extremely thin coal seam mining is relatively low, and the drill type shearer is widely used due to its short body and high power. However, at this stage, the hydraulic drill type shearer drill pipe adopts monorail lifting and manual Docking, and through the adjustment of the fine adjustment mechanism consisting of ratchet and hydraulic cylinder to complete the docking of the drill pipe, the control precision is low, the time of loading and unloading the drill pipe is long, and the coal mining efficiency is greatly reduced. In addition, the hydraulic system uses a fixed pump to supply oil. The hydraulic circuit is not synchronized due to the change of external load during the working process of the drilling rig, and it cannot work under the optimal parameters. A plurality of speed regulating valves and overflow valves are arranged in the hydraulic system, and the system has large power loss, severe heat generation and low reliability.

Summary of the invention

Technical Problem: The object of the present invention is to overcome the deficiencies in the prior art and provide a hydraulic control system for a full hydraulic drill type shearer with high integration, small volume, low heat generation, and easy operation and maintenance.

Technical Solution: The hydraulic control system of the full hydraulic drill type shearer of the present invention comprises a drilling system, a walking system, a propulsion system and an auxiliary system; the drilling system comprises a fuel tank, a filter, a double variable displacement piston pump, and electricity Liquid proportional valve, drilling motor and hydraulic oil pipe for component connection; fuel tank is connected to double variable displacement piston pump through filter filtration, double variable displacement piston pump outlet port is connected to one-way valve; electro-hydraulic proportional valve inlet port It is connected with the oil outlet of the check valve, and the oil outlet is connected with the drilling motor. The LS port of the electro-hydraulic proportional valve is connected with the LS port of the double-variable piston pump; the oil circuit connected to the drilling motor and the electro-hydraulic proportional valve is provided. There is a pressure gauge; the system is closed-loop controlled by a double-variable piston pump and an electro-hydraulic proportional valve;

The traveling system adopts an open load sensitive system, and shares a double variable displacement piston pump with the drilling system, which includes a fuel tank, a filter, a double variable displacement piston pump, a check valve, a shuttle valve, and a load sensitive multi-way valve. Group, direct-acting manual reversing valve and traveling motor; the fuel tank is connected to the double-variable piston pump through filter filtration, and the double-variable piston pump outlet is connected to the one-way valve; the one-way valve outlet is divided into two The road is connected to the electro-hydraulic proportional valve through the oil pipe, and the other pipe is connected to the oil inlet of the load-sensitive multi-way valve group through the oil pipe; the two oil outlets of the load-sensitive multi-way valve group are respectively connected with the inlet port of the traveling motor, the pilot oil The port is connected with the direct-acting manual reversing valve; one end of the shuttle valve inlet port is connected with the LS port of the load-sensitive multi-way valve group, one end is connected with the LS port of the electro-hydraulic proportional valve, and the oil outlet port and the double-variable displacement piston pump are connected. The LS port is connected.

The propulsion system includes a propulsion cylinder, a pilot sequence valve, a speed control valve, a multi-way valve group, a two-way hydraulic lock, an axial piston pump, a self-sealing suction filter, a pilot-operated relief valve, a water cooler, and an oil return. Filters, pressure gauges and fuel tanks; The oil tank is connected to the axial piston pump through a self-sealing suction filter; the axial piston pump outlet is divided into two paths, one is connected to the inlet of the multi-way valve group through the oil pipe, and the other is connected to the inlet of the pilot-operated relief valve through the oil pipe; The pilot-operated relief valve is connected in series with the water cooler, the oil return filter and the oil tank through the oil pipe; the outlet of the multi-way valve group is connected with the inlet of the two-way hydraulic lock; the outlets of the two-way hydraulic lock have a rod cavity and a rodless rod respectively with the propulsion cylinder The chambers are connected in parallel; the three propulsion cylinders are connected in parallel, the cylinder G18 and the bidirectional hydraulic lock are connected in series with a speed regulating valve in the oil passage, and the cylinder G18 and the cylinder G19 have no rod chamber connected in series with a pilot sequence valve; the axial column A pressure gauge is connected to the outlet of the plug pump and the outlet of the multi-way valve group;

The auxiliary system completes the rig working platform support, platform tilting, drill pipe conveying and drill pipe clamping, and includes a platform tilting cylinder, a balancing valve, a smooth valve, an eight-way valve, a platform supporting cylinder, a two-way hydraulic lock, a drill pipe Demolition cylinder, drill rod support cylinder, front frame cylinder, drill rod conveying motor, multi-way valve, axial piston pump, self-sealing suction filter and fuel tank; auxiliary system and propulsion system share a group of oil inlet circuit and oil return circuit The hydraulic oil is connected to the drill rod removing cylinder (25), the drill rod supporting cylinder, the front frame cylinder and the drill rod conveying motor via the multi-way valve (24), and a bidirectional hydraulic lock is connected in series between the cylinders; the multi-way valve The bridge is connected with the eight-way valve; the oil outlets of the eight-way valve are respectively connected in parallel with the platform adjusting oil cylinder and the platform supporting oil cylinder, and the smooth valve and the balancing valve are connected in series between the eight-connected valve and the platform adjusting oil cylinder. a two-way hydraulic lock is connected in series between the eight-way valve and the platform support cylinder;

The drilling motor is provided with a pressure sensor on the oil inlet, and a rotary encoder and an angular displacement sensor are arranged at the connection between the drilling motor and the drill pipe.

The load sensitive multi-way valve group is a double valve.

The eight-way valve and the multi-way valve group are three-position six-way electromagnetic reversing valves, and the control modes thereof are all Y-type functions.

There are a total of 20 hydraulic cylinders, which are represented by G1-G20.

Advantageous Effects: The present invention adopts electro-hydraulic automatic control to facilitate operation and maintenance, and has the following advantages compared with the prior art:

1. The hydraulic control system of the full hydraulic drill type coal mining machine adopts the drilling system, the walking system, the propulsion system and the auxiliary system; the sub-systems do not interfere with each other during the working process, which is convenient for operation and convenient for maintenance.

2. The drilling system is closed-loop controlled by the load-sensitive variable pump and the electro-hydraulic proportional valve. The system pressure and flow can be automatically adjusted according to the load change, and the drill pipe drilling speed and position can be controlled in real time to improve work efficiency and reduce auxiliary operations. time;

3. The walking system adopts an open load sensitive system, and shares a double variable displacement piston pump with the drilling system, which can effectively reduce system complexity and system space, and reduce the size of the drilling machine.

4. The propulsion system consists of a quantitative pump and a speed control valve. The air cylinder and the drill pipe are advanced. The propulsion speed can be adjusted according to the cutting condition of the drilling machine to realize the cutting of the drilling machine under the maximum efficiency.

5. Effectively solve the complicated oil circuit of the hydraulic system of the existing hydraulic drill type shearer, it is difficult to realize the precise control of the drill pipe, the system efficiency is low, and the auxiliary operation and the long time of changing the drill pipe are long.

DRAWINGS

1 is a block diagram showing the structure of a hydraulic control system for a full hydraulic drill type shearer according to the present invention;

2 is a structural block diagram of a drill pipe positioning system of a full hydraulic drill type coal mining machine of the present invention;

Figure 3 is a schematic diagram of the hydraulic control system of the full hydraulic drill type shearer of the present invention.

In the figure: 1-tank; 2-filter; 3-water-cooled motor; 4-star elastic coupling; 5-double variable displacement piston pump; 6-way valve; 7-electro-hydraulic proportional valve; Pressure gauge; 9-drilling motor; 10-pressure sensor; 11-boiler valve; 12-load-sensitive multi-way valve group; 13-direct-acting manual reversing valve; 14-travel motor; 15-platform tilting cylinder; 16-balance valve; 17-stationary valve; 18-eight joint valve; 19-platform support cylinder; 20-two-way hydraulic lock; 21-propulsion cylinder; 22-pilot sequence valve; 23-speed valve; 24-way Valve group; 25-drill rod removal cylinder; 26-drill rod support cylinder; 27-front frame cylinder; 28-drill pipe conveying motor; 29-water cooler; 30-return filter; 31-pilot-operated relief valve 32-axial piston pump; 33- self-sealing suction filter; 34-level gauge; 35-air filter; 36-angular displacement sensor; 37-rotary encoder.

detailed description

The embodiments of the present invention are further described below with reference to the accompanying drawings:

As shown in FIG. 1 , the hydraulic control system of the full hydraulic drill type shearer of the present invention comprises a drilling system, a walking system, a propulsion system and an auxiliary system;

As shown in Figure 3, the drilling system includes a fuel tank, a filter, a dual variable displacement piston pump, an electro-hydraulic proportional valve, a drilling motor, and a hydraulic oil pipe for component connection; the fuel tank is filtered through a filter and a double variable displacement piston pump. Connected, double-variable piston pump outlet port is connected to check valve; electro-hydraulic proportional valve inlet port is connected with check valve outlet port, oil outlet is connected with drilling motor, LS port and double of electro-hydraulic proportional valve The LS port of the covariate piston pump is connected; a pressure gauge is arranged on the oil line connecting the drilling motor and the proportional valve;

Among them, the walking system and the drilling system share a double variable displacement piston pump, including fuel tank, filter, double variable displacement piston pump, check valve, shuttle valve, load sensitive multi-way valve group, direct-acting manual commutation The valve and the traveling motor; the fuel tank is connected to the double-variable piston pump through the filter, and the double-variable piston pump outlet is connected with the one-way valve; the one-way valve outlet is divided into two paths, one through the oil pipe and the electro-hydraulic The proportional valve is connected, and the other channel is connected to the load port of the load sensitive multi-way valve group through the oil pipe; the two oil outlets of the load-sensitive multi-way valve group are respectively connected with the inlet port of the traveling motor, the pilot port and the direct-acting manual commutation The valve is connected; one end of the inlet port of the shuttle valve is connected to the LS port of the load-sensitive multi-way valve group, and the ratio of one end to the electro-hydraulic ratio The LS port of the valve is connected, and the oil outlet is connected to the LS port of the double variable displacement piston pump.

Among them, the propulsion system includes propulsion cylinder, pilot sequence valve, speed control valve, multi-way valve group, two-way hydraulic lock, axial piston pump, self-sealing suction filter, pilot-operated relief valve, water cooler, oil return Filter, pressure gauge and fuel tank; the fuel tank is connected to the axial piston pump through a self-sealing suction filter; the axial piston pump outlet is divided into two ways, one is connected to the inlet of the multi-way valve group through the oil pipe, and the other is through the oil pipe and the pilot The inlet of the overflow valve is connected; the pilot type overflow valve is connected in series with the water cooler, the return oil filter and the oil tank through the oil pipe; the outlet of the multi-way valve group is connected with the inlet of the two-way hydraulic lock; the outlets of the two-way hydraulic lock are respectively connected with The propulsion cylinder has a rod cavity and a rodless chamber; the three propulsion cylinders are connected in parallel, and the cylinder G18 and the bidirectional hydraulic lock are connected in series with a speed regulating valve in the oil passage, and the cylinder G18 and the cylinder G19 have no rod chamber connected in series. Pilot-operated sequence valve; a pressure gauge is connected to the outlet of the axial piston pump and the outlet of the multi-way valve group;

Among them, the auxiliary system includes platform tilting cylinder, balance valve, smooth valve, eight-way valve, platform support cylinder, two-way hydraulic lock, drill pipe conveying motor, front frame cylinder, drill rod support cylinder, drill rod dismounting cylinder, multi-way valve , axial piston pump, self-sealing suction filter and fuel tank; auxiliary system and propulsion system share a set of oil inlet circuit and oil return circuit; hydraulic oil through multi-way valve and drill rod conveying motor, front frame cylinder, drill pipe The supporting cylinder and the drill rod dismounting cylinder are connected, and a bidirectional hydraulic lock is connected in series between the cylinders; the cross bridge is connected between the multi-way valve and the eight-way valve; the oil outlets of the eight-way valve are respectively adjusted with the platform and the hydraulic cylinder and the platform The supporting oil cylinders are connected in parallel, and a smooth valve and a balancing valve are sequentially connected in series between the eight-way valve and the platform adjusting oil cylinder, and a two-way hydraulic lock is connected in series between the eight-connected valve and the platform supporting oil cylinder;

a pressure sensor is disposed on the oil inlet of the drilling motor, and a rotary encoder and an angular displacement sensor are disposed at the connection between the drilling motor and the drill pipe;

The load-sensing multi-way valve group is a double-connected valve; the eight-way valve and the multi-way valve group are three-position six-way electromagnetic reversing valves, and the control manners thereof are all Y-type functions; the hydraulic cylinders total 20, Respectively represented by G1-G20;

The double-variable piston pump is connected to the water-cooled motor by a star-shaped elastic coupling; each hydraulic system is connected to the fuel tank by the same oil return circuit; the top of the fuel tank is provided with an air filter, and a liquid level gauge is arranged on the side.

The working process of the present invention is briefly described in conjunction with FIG. 3:

Drilling system: the water-cooled motor 3 drives the double-variable piston pump 5 through the star-shaped elastic coupling 4, and the double-variable piston pump 5 sucks oil from the fuel tank 1 through the filter 2, and the oil is pumped from the double-variable piston pump. The outlet 5 flows through the check valve 6 to the electro-hydraulic proportional valve 7, and further flows into the inlet of the drilling motor 9, and pushes the drilling motor to rotate. The LS port of the electro-hydraulic proportional valve 7 is connected to the LS port of the double-variable piston pump 5, and the system pressure and flow rate can be automatically adjusted according to the load change, so that the drill pipe drilling speed is not affected by the load change, and the drilling motor 9 enters the oil. A pressure sensor 10 is arranged on the road, and a rotary encoder 36 and an angular displacement sensor 37 are arranged at the connection between the drilling motor and the drill pipe, and a closed loop control is formed with the electro-hydraulic proportional valve 7. The system adjusts the amount of opening of the electro-hydraulic proportional valve 7 in real time according to system changes.

Walking system: the walking system and the drilling system share a double-variable piston pump and an oil-absorbing oil circuit. After the water-cooled motor 3 is started, the oil is divided into two paths through the one-way valve 6, and all the way flows through the oil pipe to the electro-hydraulic proportional valve 7, The other way flows through the oil pipe to the load-sensitive multi-way valve group 12, and the two-way oil outlets of the load-sensing multi-way valve group 12 are respectively connected to the oil inlet of the traveling motor 14, and the pilot control oil port is connected with the direct-acting manual reversing valve 13. To control the forward rotation, reverse rotation and stop of the traveling motor; the LS port of the load-sensitive multi-way valve group 12 is connected to the shuttle valve 11, and the other end of the shuttle valve 11 is connected to the LS port of the electro-hydraulic proportional valve 7, and the outlet of the shuttle valve 11 is The LS port of the double variable displacement piston pump 5 is connected. Through the selection of the shuttle valve, the travel system and the drilling system can achieve load-sensitive control respectively.

Propulsion system: the oil in the oil tank 1 is filtered by the self-sealing suction filter 33, and then flows through the axial piston pump 32 to the multi-way valve group 24, when the multi-way valve group 7 is in the neutral position, the hydraulic oil flows directly back to the oil tank 1; When the multi-way valve block 7 is in the left position, the oil flows through the two-way hydraulic lock 20 to the speed regulating valve 23, and is divided into two paths through the speed regulating valve 23, one way directly flows to the rodless chamber of the hydraulic cylinder G18, and one passes through the pilot type sequence valve. 22 flows to the hydraulic cylinders G19, G20 without rod cavity, through the selection of the pilot sequence valve 22, the hydraulic cylinder can be extended, the drill pipe is advanced, and the advancement speed of the drill pipe is adjusted by changing the opening amount of the speed regulating valve 23; When the multi-way valve group is in the right position, the oil flows directly to the propulsion cylinder 21 through the two-way hydraulic lock 20, and the propulsion cylinder piston retracts to complete the drill rod retreat.

Auxiliary system: the oil in the oil tank 1 is filtered by the self-sealing suction filter 33, and then flows through the axial piston pump 32 to the multi-way valve group 24 and the eight-way valve 18, and between the multi-way valve group 24 and the eight-way valve 18 Bridge connection, each valve block 24 is respectively connected with the drill rod removing cylinder 25, the drill rod supporting cylinder 26, the front frame cylinder 27, the drill rod conveying motor 28, and the eight-way valve 18 is respectively adjusted with the platform. The inclined oil cylinder 15 is connected with the platform supporting oil 19, and the respective hydraulic circuits are independent from each other. By changing the opening of the corresponding valve block, the support of the drill pipe platform, the tilting and the clamping and conveying of the drill pipe are realized.

As shown in FIG. 2, the drill pipe changing process: a rotary encoder 36 and an angular displacement sensor 37 are provided at the connection between the drilling motor and the drill pipe, and a closed-loop control system, a rotary encoder 36 and an angular displacement are formed with the electro-hydraulic proportional valve 7. The sensor 37 detects the circumferential position of the drill pipe and feeds back to the industrial control upper machine, and changes the size of the analog output by the industrial control upper computer, thereby adjusting the opening amount of the electro-hydraulic proportional valve 7, realizing the adjustment of the drill pipe drilling speed, and finally stopping the drill pipe. The circumferential direction is specified. After that, the drill pipe support cylinder 26 is started to clamp the drill pipe to be exchanged, the drill pipe transport motor 28 is started to transport the drill pipe to the host position, and the propulsion cylinder is pushed to push the output shaft of the double-variable piston pump 5 and the drill pipe to be exchanged. The end is connected, and the double-variable piston pump 5 is continuously pushed to realize that the front end of the drill pipe to be connected is connected to the rear end of the working drill pipe; the drill pipe support cylinder 26 is reversed, the drill pipe to be exchanged is released, and the drill pipe is replaced.

Claims

A hydraulic control system for a full hydraulic drill type shearer, comprising a drilling system, a walking system, a propulsion system and an auxiliary system; characterized in that the drilling system comprises a fuel tank (1), a filter (2), and a double connection Variable displacement piston pump (5), electro-hydraulic proportional valve (7), drilling motor (9) and hydraulic oil pipe for component connection; fuel tank (1) filtered through filter (2) and double variable displacement piston pump (5 Connected, double-variable piston pump (5) oil outlet is connected to check valve (6); electro-hydraulic proportional valve (7) oil inlet is connected with check valve (6) oil outlet, oil outlet and drill The inlet motor (9) is connected, the LS port of the electro-hydraulic proportional valve (7) is connected to the LS port of the double-variable piston pump (5); the drilling motor (9) is connected to the oil path connected to the electro-hydraulic proportional valve (7). Pressure gauge (8); closed-loop control of the system through a double-variable piston pump and an electro-hydraulic proportional valve (7);

The traveling system adopts an open load sensitive system, and shares a double variable displacement piston pump with the drilling system, which comprises a fuel tank (1), a filter (2), a double variable displacement piston pump (5), a check valve (6), shuttle valve (11), load-sensitive multi-way valve group (12), direct-acting manual reversing valve (13) and travel motor (14); fuel tank (1) filtered and double-filtered through filter (2) The variable displacement piston pump (5) is connected, the double-connected displacement piston pump (5) is connected to the check valve (6); the check valve (6) is divided into two channels, one through the oil pipe and the electro-hydraulic The proportional valve (7) is connected, and the other is connected to the load-sensitive multi-way valve group (12) inlet port through the oil pipe; the load-sensitive multi-way valve group (12) two-way oil outlet and the travel motor (14) inlet port respectively Connected, the pilot port is connected to the direct-acting manual reversing valve (13); one end of the shuttle valve inlet port is connected to the LS port of the load-sensing multi-way valve block (12), and one end is connected to the LS of the electro-hydraulic proportional valve (7) The port is connected, and the oil outlet is connected to the LS port of the double-variable piston pump (5).

The propulsion system includes a propulsion cylinder (21), a pilot sequence valve (22), a speed control valve (23), a multi-way valve group (24), a bidirectional hydraulic lock (20), an axial piston pump (32), Self-sealing suction filter (33), pilot operated relief valve (31), water cooler (29), oil return filter (30), pressure gauge (8) and fuel tank (1); fuel tank (1) is self-sealing The oil suction filter (33) is connected to the axial piston pump (32); the outlet of the axial piston pump (32) is divided into two paths, one is connected to the inlet of the multi-way valve group (24) through the oil pipe, and the other is passed through the oil pipe and The inlet of the pilot type relief valve (31) is connected; the pilot type relief valve (31) is connected in series with the water cooler (29), the return oil filter (30) and the oil tank (1) through the oil pipe; the multi-way valve group (24) The outlet is connected to the inlet of the two-way hydraulic lock (20); the outlets of the two-way hydraulic lock (20) are respectively connected with the rod chamber and the rodless chamber of the propulsion cylinder (21); the three propulsion cylinders are connected in parallel, the cylinder G18 The speed control valve (23) is connected in series with the two-way hydraulic lock (20). The cylinder G18 and the cylinder G19 are connected to the rodless chamber. The pilot sequence valve (22) is connected in series with the oil passage; the axial piston pump (32) Export and multi-way valve group (24) export oil road Do not bypass the pressure gauge (8);

The auxiliary system completes the rig working platform support, platform tilting, drill pipe transport and drill pipe clamping, which includes the platform Tilting cylinder (15), balancing valve (16), smoothing valve (17), eight-way valve (18), platform support cylinder (19), two-way hydraulic lock (20), drill rod removal cylinder (25), drill pipe Support cylinder (26), front frame cylinder (27), drill rod conveying motor (28), multi-way valve (24), axial piston pump (32), self-sealing suction filter (33) and fuel tank (1) The auxiliary system and the propulsion system share a set of oil inlet circuits and oil return circuits; the hydraulic oil passes through the multi-way valve (24) and the drill rod removal cylinder (25), the drill rod support cylinder (26), and the front frame cylinder (27) The drill rod conveying motor (28) is connected, and a bidirectional hydraulic lock (20) is connected in series between the cylinders; a cross bridge connection is adopted between the multi-way valve (24) and the eight-way valve (18); the eight-way valve (18) Each oil outlet is connected in parallel with the platform tilting cylinder (15) and the platform supporting cylinder (19), and a smooth valve (17) and balance are sequentially connected in series between the eight-way valve (18) and the platform tilting cylinder (15). a two-way hydraulic lock (20) is connected in series between the valve (16), the eight-way valve (18) and the platform support cylinder (19);
The hydraulic control system for a full hydraulic drill type shearer according to claim 1, characterized in that: the drilling motor (9) is provided with a pressure sensor (10) on the oil inlet, and the connection between the drilling motor and the drill pipe A rotary encoder (37) and an angular displacement sensor (36) are provided.
The hydraulic control system for a full hydraulic drill type shearer according to claim 1, wherein said load sensitive multi-way valve group (12) is a double valve.
The hydraulic control system for a full hydraulic drill type shearer according to claim 1, wherein the eight-way valve (18) and the multi-way valve group (24) are three-position six-way electromagnetic reversing valves. Its control method is Y-type function.
The hydraulic control system for a full hydraulic drill type shearer according to claim 1, wherein the hydraulic cylinders are a total of 20, which are respectively represented by G1-G20.