Independent double-loop hydraulic system of walking and working device for coal mine

Abstract

The utility model discloses an independent double-loop hydraulic system of a walking and working device for a coal mine, which belongs to the technical field of design of hydraulic systems of underground coal mine transportation equipment and comprises a main oil way, a steering loop, a brake loop and a control loop, and the steering loop, the brake loop and the control loop are mutually independent. Pressurized oil sequentially passes through the overflow valve, the door opening self-locking hydraulic reversing valve and the traveling crane tool interlocking hydraulic reversing valve and then is divided into two paths, one path of high-pressure oil is conveyed to a control loop through a pipeline, and the other path of pressure oil is divided into two paths through a pipeline and then conveyed to a brake loop and a steering loop through a first one-way valve and a second one-way valve respectively. Compared with the prior art, the mechanism can effectively prevent the walking device and the working device from acting at the same time due to misoperation, and equipment damage and safety accidents are avoided. In addition, through a hydraulic interlocking mechanism, the stability and reliability of the equipment in different working states are ensured, and the equipment fault and maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to coal mine underground transport equipment technical field especially relates to a coal mine walking and working device independent double circuit hydraulic system. BACKGROUND

[0002] In the field of coal mine trackless transportation, trackless rubber-tyred vehicles are usually used to transport materials to underground, and then the materials are manually carried to designated storage locations one by one. There are many problems such as multiple transfer links and high labor intensity of operating personnel, which greatly increases the safety hazards of mine production. Because of the variety and large quantity of materials, 5-6 people are needed to cooperate to complete the loading and unloading process, which takes about 2 hours, and there is a high safety risk in the process of carrying heavy objects and climbing.

[0003] A material containerized transport vehicle for the tunneling working face needs to be developed to realize material containerized transportation and loading and unloading at the tunneling working face. The walking and working device of the material containerized transport vehicle are independent. In order to ensure the safe and stable operation of the equipment and avoid dangerous situations caused by misoperation, a hydraulic system capable of interlocking the walking and working device needs to be designed. UTILITY MODEL CONTENTS

[0004] In view of the above technical problems, the utility model provides a coal mine walking and working device independent double circuit hydraulic system, which solves the above problems by the following technical means:

[0005] A coal mine walking and working device independent double circuit hydraulic system, characterized in that it comprises a main oil circuit and independent steering circuit, braking circuit and control circuit, wherein: the main oil circuit comprises an oil tank, a gear pump, an overflow valve, an open door self-locking hydraulic reversing valve and a travelling crane tool interlocking hydraulic reversing valve, the gear pump is driven by a gearbox to rotate and suck oil from the oil tank, and the pressurized oil passes through the overflow valve, the open door self-locking hydraulic reversing valve and the travelling crane tool interlocking hydraulic reversing valve in turn and is then divided into two paths, one path of high-pressure oil is delivered to the control circuit through a pipeline, and the other path of pressurized oil is divided into two through a pipeline and then delivered to the braking circuit and the steering circuit through a first one-way valve and a second one-way valve respectively; the steering circuit comprises a steering pressure gauge, a steering accumulator, a steering control valve, a hydraulic buffer valve and a steering oil cylinder, high-pressure oil enters the steering control valve, the hydraulic buffer valve and the steering oil cylinder through a pipeline in turn, and the steering pressure gauge and the steering accumulator are further arranged on the steering circuit; the braking circuit comprises a braking pressure gauge, a braking accumulator, a foot brake valve, a hand brake valve and front and rear axle brakes, high-pressure oil enters the foot brake valve, the hand brake valve and the front and rear axle brakes through a pipeline in turn, and the braking pressure gauge and the braking accumulator are further arranged on the braking circuit; the control circuit comprises a multi-way valve and an execution unit composed of a plurality of corresponding oil cylinders and motors.

[0006] Preferably, a manual pump is arranged on the circuit of the steering circuit and the brake circuit, and the manual pump is used to release the brake force.

[0007] Preferably, a pressure sensor is arranged at the oil inlet of the hand brake valve of the brake circuit, and when the pressure sensor detects a failure of the hydraulic system during driving, the vehicle is powered off to complete the power-off braking.

[0008] Preferably, the execution unit in the control circuit comprises a support oil cylinder, a top supporting oil cylinder, a fork frame swing oil cylinder, a fork frame lifting oil cylinder, a fork frame pushing oil cylinder and a fork frame extending motor, wherein: the support oil cylinder is arranged on both sides of the chassis to complete the lifting work of the support legs; the top supporting oil cylinder is arranged on both sides of the gear to push the container; the cylinder body of the fork frame swing oil cylinder is arranged on the top of the lifting frame, the telescopic shaft of the fork frame swing oil cylinder is connected to the gear frame, and the fork frame swing oil cylinder is used to adjust the left and right positions of the gear; the fork frame lifting oil cylinder is arranged between the door-shaped frame and the lifting frame, and is used to push the lifting frame to move up and down; the fork frame pushing oil cylinder is arranged on the fork frame, and is used to drive the gear to extend or retract; and the fork frame extending motor is used to drive the rack and pinion structure to drive the door-shaped frame to move back and forth along the rack.

[0009] The walking and working device independent double-circuit hydraulic system for coal mines has the following beneficial effects:

[0010] In order to ensure the safety of the driver, when the cab door is not closed, the vehicle should be stationary. Therefore, a reversing valve is added at the opening and closing of the cab door to receive signals and select the direction of liquid flow. When the door is not closed, the hand brake valve is started, and the brake cannot be released due to the inability to establish hydraulic system pressure.

[0011] In order to ensure the safety of the driver, when the cab door is not closed, the vehicle should be stationary. Therefore, a reversing valve is added at the opening and closing of the cab door to receive signals and select the direction of liquid flow. When the door is not closed, the hand brake valve is started, and the brake cannot be released due to the inability to establish hydraulic system pressure.

[0012] The mechanism can effectively prevent the walking device and the working device from moving simultaneously due to misoperation, and avoid equipment damage and safety accidents. In addition, through the hydraulic interlocking mechanism, the stability and reliability of the equipment in different working states are ensured, and the equipment failure and maintenance cost are reduced. Finally, the operator can more accurately control the walking and working devices of the equipment, and improve the work efficiency and operation quality. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme of the present application, the drawings used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0014] Figure 1 is a hydraulic principle schematic diagram of the present application;

[0015] Figure 2 is a main oil circuit schematic diagram of the present application;

[0016] Figure 3 is a coal mine walking and working device structure schematic diagram of the present application;

[0017] Figure 4 is a coal mine working device unfolded state schematic diagram of the present application;

[0018] Figure 5 is a coal mine working device recycling state schematic diagram of the present application;

[0019] Figure 6 is a multi-way valve corresponding actuator structure schematic diagram in the present application.

[0020] In the figure, the oil tank-1, gear pump-2, overflow valve-3, open door self-locking hydraulic reversing valve-4, traveling device tool interlocking hydraulic reversing valve-5, first one-way valve-6, second one-way valve-7, hand pump-8, steering pressure gauge-9, steering accumulator-10, steering control valve-11, hydraulic buffer valve-12, steering oil cylinder-13, brake pressure gauge-14, brake accumulator-15, foot brake valve-16, hand brake valve-17, front and rear axle brake-18, pressure sensor-19, multi-way valve-20, outrigger oil cylinder-21, roof supporting oil cylinder-22, fork frame swing oil cylinder-23, fork frame lifting oil cylinder-24, fork frame pushing oil cylinder-25, fork frame extending motor-26. DETAILED DESCRIPTION

[0021] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. The terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specified.

[0022] The utility model will be described in detail below with reference to the drawings.

[0023] As Figures 1 to 6 shown, the coal mine walking and working device independent double loop hydraulic system includes a main oil circuit, and a steering loop, a brake loop and a control loop which are independent of each other, in the drawing, the main oil circuit includes an oil tank 1, a gear pump 2, a relief valve 3, an open door self-locking hydraulic reversing valve 4 and a crane tool interlocking hydraulic reversing valve 5, the gear pump 2 is driven by a gearbox and sucks oil from the oil tank 1, and the pressurized oil passes through the relief valve 3, the open door self-locking hydraulic reversing valve 4 and the crane tool interlocking hydraulic reversing valve 5 in turn and is divided into two paths, one path of high-pressure oil is delivered to the control loop through a pipeline, and the other path of pressurized oil is divided into two through a pipeline and is delivered to the brake loop and the steering loop through the first one-way valve 6 and the second one-way valve 7 respectively.

[0024] In the drawing, the steering loop includes a steering pressure gauge 9, a steering accumulator 10, a steering control valve 11, a hydraulic buffer valve 12 and a steering oil cylinder 13, high-pressure oil enters the steering control valve 11, the hydraulic buffer valve 12 and the steering oil cylinder 13 in turn through a pipeline, and the steering loop is further provided with the steering pressure gauge 9 and the steering accumulator 10; the brake loop includes a brake pressure gauge 14, a brake accumulator 15, a foot brake valve 16, a hand brake valve 17 and front and rear axle brakes 18, high-pressure oil enters the foot brake valve 16, the hand brake valve 17 and the front and rear axle brakes 18 in turn through a pipeline, and the brake loop is further provided with the brake pressure gauge 14 and the brake accumulator 15; the control loop includes a multi-way valve 20 and a corresponding plurality of execution units composed of oil cylinders and motors.

[0025] In the embodiment, the steering loop and the brake loop are further provided with a hand pump 8 on the loop, and the hand pump 8 is used to release the braking force.

[0026] In actual work, the steering control valve 11 will produce hydraulic impact on the hydraulic steering cylinder 13 when reversing, at which time the high-pressure overflow valve in the buffer valve 12 can play a buffering role. At the moment of impact, the pressure on the high-pressure side of the cylinder suddenly rises, and then the overflow valve opens to release the pressure, which can slow down and eliminate the hydraulic impact. After the vehicle starts, the hydraulic oil is processed by the accumulator 15 to form a stable hydraulic source, and the hydraulic source is released from the front and rear wheels of the vehicle through the hand brake valve 17. When the vehicle needs to brake during driving, the foot brake valve 16 is operated to cut off the hydraulic source, which can be realized. The pressure sensor 19 is designed at the oil inlet P of the hand brake valve 17. If the hydraulic system fails during driving, the sensor detects it, and the whole vehicle is powered off, thereby realizing power-off braking. The manual pump 8 is designed in the system, which can release the brake through the manual pump 8 when the engine of the vehicle fails to start, and the whole vehicle is towed to the designated area.

[0027] It should be noted that when the vehicle needs to unload materials, the pressurized oil passes through the overflow valve 3, the door self-locking hydraulic reversing valve 4, and the traveling tool interlocking hydraulic reversing valve 4 in turn, and directly enters the load-sensitive multi-way valve 20. The multi-way valve 20 controls the outrigger oil cylinder 21, the jacking oil cylinder 22, the fork frame swing oil cylinder 23, the fork frame lifting oil cylinder 24, the fork frame pushing oil cylinder 25, and the fork frame extending motor 26, respectively, to complete the lifting of the outrigger, the ejection of the container, the left-right movement adjustment of the fork frame, the up-down movement of the fork frame as a whole, the lateral extension of the fork frame as a whole, and the size adjustment of the gear spacing. The multi-way valve adopts manual and electric control two control modes, which can be manually operated when the remote control or electric control fails, to ensure the safety of personnel and materials.

[0028] It should be noted that when the driver's door is not closed, the P port of the No. 4 reversing valve is the same as the B port, directly returning to the oil tank, and the oil pressure of the whole hydraulic system is not established, so the vehicle cannot release the brake and is in a stationary state. When the cab door is closed, the P port of the No. 4 reversing valve communicates with the A port, and the high-pressure oil enters the No. 5 reversing valve through the A port. The No. 5 reversing valve reverses according to the needs of the working condition. When the No. 5 reversing valve receives the signal that the vehicle needs to transport materials, the P port communicates with the B port, and the high-pressure oil enters the brake and steering circuit through the No. 5 reversing valve, and the vehicle starts to walk. When the No. 5 reversing valve receives the signal that the vehicle needs to be loaded and unloaded, the P port is the same as the A port, and the high-pressure oil enters the working device circuit through the No. 5 reversing valve, and the container moves, ensuring the independent operation of the walking and working device.

[0029] In this example, the execution unit in the control loop includes the outrigger oil cylinder 21, the jacking oil cylinder 22, the fork frame swing oil cylinder 23, the fork frame lifting oil cylinder 24, the fork frame pushing oil cylinder 25, and the fork frame extension motor 26. The outrigger oil cylinder 21 is arranged on both sides of the chassis to complete the lifting work of the outrigger. The jacking oil cylinder 22 is arranged on both sides of the pinion to push the container. The cylinder body of the fork frame swing oil cylinder 23 is arranged on the top of the lifting frame, and the telescopic shaft of the fork frame swing oil cylinder 23 is connected to the pinion rack. The fork frame swing oil cylinder 23 is used to adjust the left and right positions of the pinion. The fork frame lifting oil cylinder 24 is arranged between the gate frame and the lifting frame, and is used to push the lifting frame to move up and down. The lifting frame is movably installed in the guide slot on both sides of the gate frame. The fork frame pushing oil cylinder 25 is arranged on the fork frame, and is used to drive the pinion to extend or retract. The fork frame extension motor 26 is used to drive the rack and pinion structure, and drive the gate frame to move forward and backward along the rack.

[0030] In actual work, the mechanism includes guide rails, a gate frame, a translation mechanism, a lifting mechanism, and a double-shaft adjustment oil cylinder, and has functions of forward and backward movement adjustment, height adjustment, and left and right swing adjustment. The forward and backward movement adjustment is achieved through a rack and pinion structure, the height adjustment is achieved through a lifting oil cylinder, and the left and right swing adjustment is achieved through a double-shaft adjustment oil cylinder. The mechanism can realize automatic unloading of the carriage laterally.

[0031] In the coal mine walking and working device independent double-circuit hydraulic system, in order to ensure the safety of the driver, when the cab door is not closed, the vehicle should be stationary. Therefore, a reversing valve is added at the opening and closing of the cab door to receive signals and select the direction of liquid flow. When the door is not closed, the hand brake valve is started, and the brake cannot be released due to the inability to establish hydraulic system pressure. During the operation of the container on the vehicle, in order to ensure the safety of the operator, the whole vehicle must be in the braking state, so an interlock valve is added in the hydraulic system. During the movement of the container, even if the driver door is closed and the hand brake valve is started, the vehicle cannot move. During the movement of the vehicle, if the handle of the working device is mistakenly operated, the working device oil circuit is closed due to the existence of the interlock valve, and the movement of the container will not be caused. The mechanism can effectively prevent the simultaneous operation of the walking device and the working device caused by mistaken operation, avoid equipment damage and safety accidents. In addition, through the hydraulic interlocking mechanism, the stability and reliability of the equipment in different working states are ensured, and the equipment failure and maintenance cost are reduced. Finally, the operator can more accurately control the walking and working devices of the equipment, and improve the work efficiency and operation quality.

[0032] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to; although the present application is described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still be modified to the technical solutions recorded in the foregoing examples, or part of the technical features are replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A coal mine walking and working device independent dual-circuit hydraulic system, characterized in that, The hydraulic system comprises a main oil circuit, a steering circuit, a brake circuit and a control circuit, wherein: The main oil circuit comprises an oil tank (1), a gear pump (2), an overflow valve (3), a door opening self-locking hydraulic reversing valve (4) and a travelling gear interlocking hydraulic reversing valve (5), the gear pump (2) is driven to rotate by the gearbox and sucks oil from the oil tank (1), the pressurized oil is sequentially passed through the overflow valve (3), the door opening self-locking hydraulic reversing valve (4) and the travelling gear interlocking hydraulic reversing valve (5) and then is divided into two paths, one path of high-pressure oil is delivered to the control circuit through a pipeline, and the other path of pressurized oil is divided into two through a pipeline, and then is delivered to the brake circuit and the steering circuit through a first one-way valve (6) and a second one-way valve (7) respectively; The steering circuit comprises a steering pressure gauge (9), a steering accumulator (10), a steering control valve (11), a hydraulic buffer valve (12) and a steering oil cylinder (13), high-pressure oil is sequentially passed through the steering control valve (11), the hydraulic buffer valve (12) and the steering oil cylinder (13) through a pipeline, and the steering pressure gauge (9) and the steering accumulator (10) are further arranged on the steering circuit; The brake circuit comprises a brake pressure gauge (14), a brake accumulator (15), a foot brake valve (16), a hand brake valve (17) and front and rear axle brakes (18), high-pressure oil is sequentially passed through the foot brake valve (16), the hand brake valve (17) and the front and rear axle brakes (18) through a pipeline, and the brake pressure gauge (14) and the brake accumulator (15) are further arranged on the brake circuit; The control circuit comprises a multi-way valve (20) and an execution unit composed of a plurality of oil cylinders and motors.

2. The independent dual circuit hydraulic system for walking and working device for coal mine according to claim 1, characterized in that, A hand pump (8) is further arranged on the circuits of the steering circuit and the brake circuit, and the hand pump (8) is used for releasing the braking force.

3. The independent dual circuit hydraulic system for walking and working device of coal mine according to claim 1, characterized in that, A pressure sensor (19) is arranged at an oil inlet of the hand brake valve (17) of the brake circuit, and when the pressure sensor (19) detects a fault of the hydraulic system during travelling, the whole vehicle is powered off to complete power-off braking.

4. The independent dual circuit hydraulic system for walking and working device for coal mine according to claim 1, characterized in that, The execution unit in the control circuit comprises a supporting leg oil cylinder (21), a top supporting oil cylinder (22), a fork frame swing oil cylinder (23), a fork frame lifting oil cylinder (24), a fork frame pushing oil cylinder (25) and a fork frame extending motor (26), wherein: The supporting leg oil cylinder (21) is arranged on both sides of the chassis and is used for completing the lifting work of the supporting legs; The top supporting oil cylinder (22) is arranged on both sides of the gear inserting device and is used for pushing the container; A cylinder body of the fork frame swing oil cylinder (23) is arranged at the top of the lifting frame, a telescopic shaft of the fork frame swing oil cylinder (23) is connected to the gear inserting frame, and the fork frame swing oil cylinder (23) is used for adjusting the left and right positions of the gear inserting device; The fork frame lifting oil cylinder (24) is arranged between the door-shaped frame and the lifting frame, the fork frame lifting oil cylinder (24) is used for pushing the lifting frame to move up and down, and the lifting frame is movably arranged in the guide groove on both sides of the door-shaped frame; The fork frame pushing oil cylinder (25) is arranged on the fork frame, and the fork frame pushing oil cylinder (25) is used for driving the gear inserting device to extend or retract; The fork frame extending motor (26) is used for driving the gear rack structure to drive the door-shaped frame to move forward and backward along the rack direction.

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