Coal mining machine hydraulic device and coal mining machine hydraulic system

Abstract

The present invention provides a coal mining machine hydraulic device and a coal mining machine hydraulic system, which relate to the field of hydraulic drive technology, including a frame, a hydraulic oil pump, an oil tank, a control valve group, a first pressure oil outlet pipe and a second pressure oil outlet pipe, one end of the hydraulic oil pump is provided with a first outlet and a second outlet, the control valve group is provided with a first inlet and a second inlet, one end of the first pressure oil outlet pipe is connected to the first outlet, the other end is connected to the first inlet, and the opening direction of the first outlet is perpendicular to the first inlet; one end of the second pressure oil outlet pipe is connected to the second outlet, the other end is connected to the second inlet, and the opening direction of the second outlet is opposite to the second inlet and parallel to each other. Compared with the prior art, the coal mining machine hydraulic device provided by the present invention has a simple structure and is easy to disassemble and assemble, and can reduce the connection angle of the hydraulic hose, solving the problem of easy damage of the hydraulic hose.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic drive technology, and in particular to a coal mining machine hydraulic device and a coal mining machine hydraulic system. Background Art

[0002] When coal mining is carried out in a tunnel, the coal mining machine is usually powered by a hydraulic system. The hydraulic system is usually composed of a hydraulic pump and an oil tank. A control valve group is provided on the oil tank to control the movement of the hydraulic pump.

[0003] In the prior art, the hydraulic hose of the hydraulic pump usually needs to pass through a large angle before it can be connected to the control valve group. During operation, because the coal mining machine is only adjusted for a very short time during most of the work, the high-pressure oil turns as soon as it exits, so the high-pressure liquid pipe here also shakes between supply and stop of liquid, and the frequency and number of times are constantly changing with the workload, and it is easy to cause damage to the pipe seal and U-shaped pipe clamp at the valve port. In order to reduce the damage at these two places, the user unit often replaces the connecting joints and U-shaped pipe clamp seats of the two pipes with high-quality stainless steel materials and high-quality sealing rings, but it still cannot change the current situation of easy damage.

[0004] At the same time, the existing hydraulic system has a complex structure and is difficult to disassemble and assemble. When oil leakage occurs in the control valves and other parts of these hydraulic systems, the production team members are too lazy to replace them. They are often forced to replace them only when the oil leaks out and the system cannot work. This leads to the problem of unclean oil filling during replacement, which can easily damage the high-pressure oil pump. This not only increases the labor intensity of employees, increases oil loss, increases the cost of coal mining materials, reduces the start-up rate, and reduces production efficiency.

[0005] In view of this, it is particularly important to design and manufacture a coal mining machine hydraulic device which has a simple structure, is easy to disassemble and assemble, and can reduce the connection angle of the hydraulic hose and solve the problem that the hydraulic hose is easily damaged. Summary of the invention

[0006] The purpose of the present invention is to provide a hydraulic device for a coal mining machine, which has a simple structure and is easy to assemble and disassemble, and can reduce the connection angle of the hydraulic hose and solve the problem that the hydraulic hose is easily damaged.

[0007] Another object of the present invention is to provide a coal mining machine hydraulic system that is easy to assemble and disassemble and can solve the problem of easy damage to the hydraulic hose.

[0008] The present invention is achieved by adopting the following technical solutions.

[0009] A coal mining machine hydraulic device comprises a frame, a hydraulic oil pump, an oil tank, a control valve group, a first pressure oil outlet pipe and a second pressure oil outlet pipe. The hydraulic oil pump and the oil tank are both detachably connected to the frame, the control valve group is connected to the oil tank, a first outlet port and a second outlet port are arranged at one end of the hydraulic oil pump, a first inlet port and a second inlet port having the same opening direction are arranged on the control valve group, one end of the first pressure oil outlet pipe is connected to the first outlet port, the other end of the first pressure oil outlet pipe is connected to the first inlet port, and the opening direction of the first outlet port is perpendicular to the opening direction of the first inlet port; one end of the second pressure oil outlet pipe is connected to the second outlet port, the other end of the second pressure oil outlet pipe is connected to the second inlet port, and the opening direction of the second outlet port is opposite to the opening direction of the second inlet port and parallel to each other.

[0010] During use, the high-pressure oil discharged from the first pressure oil outlet pipe is discharged from the first outlet to the first inlet, and the opening directions of the first outlet and the first inlet are perpendicular, so the deflection angle of the main pressure oil outlet pipe is 90 degrees. Compared with the original deflection angle of 180 degrees, the high-pressure oil does not need to turn when it comes out of the first outlet, and will not form jitter at the valve port, avoiding damage to the valve port due to jitter, and improving the service life of the first pressure oil outlet pipe. The high-pressure oil discharged from the second pressure oil outlet pipe is discharged from the second outlet to the second inlet, and the opening directions of the second outlet and the second inlet are opposite, so that the second pressure oil outlet pipe can connect the second outlet and the second inlet in a straight line. Compared with the original deflection angle of 90 degrees, the high-pressure oil does not need to turn when it comes out of the second outlet, and will not form jitter at the valve port, avoiding damage to the valve port due to jitter, and improving the service life of the second pressure oil outlet pipe.

[0011] Furthermore, the hydraulic oil pump includes a pump body and an oil pipe joint seat, the oil pipe joint seat is fixedly connected to the pump body and arranged opposite to the control valve group, the first liquid outlet and the second liquid outlet are both arranged on the side of the oil pipe joint seat close to the control valve group, and the oil pipe joint seat is connected to the control valve group through the first pressure oil outlet pipe and the second pressure oil outlet pipe.

[0012] Furthermore, the first pressure oil outlet pipe and the second pressure oil outlet pipe are both flexible rubber hoses.

[0013] Furthermore, first U-shaped clips are provided at both ends of the first pressure oil outlet pipe, and the first pressure oil outlet pipe is respectively connected to the hydraulic oil pump and the control valve group through the first U-shaped clips; second U-shaped clips are provided at both ends of the second pressure oil outlet pipe, and the second pressure oil outlet pipe is respectively connected to the hydraulic oil pump and the control valve group through the second U-shaped clips.

[0014] Furthermore, the coal mining machine hydraulic device also includes a plurality of lifting oil pipes, and a plurality of lifting connection ports are also arranged on the control valve group. The plurality of lifting oil pipes are connected to the plurality of lifting connection ports one by one, and the opening direction of each lifting connection port is the same as the opening direction of the second liquid inlet.

[0015] Furthermore, the plurality of lifting oil pipes are all flexible rubber hoses.

[0016] Furthermore, the control valve group includes a valve group body and an operating handle. The valve group body has a plurality of operating valve heads arranged in parallel. The operating handle is connected to the valve group body and is used to control the opening and closing of the plurality of operating valve heads.

[0017] Furthermore, the operating handle is connected to the valve group body by bolts.

[0018] Furthermore, an oil temperature analyzer and an oil level analyzer are arranged on the oil tank, and a refueling valve port is also arranged on the oil tank. The oil temperature analyzer and the oil level analyzer are both arranged on the edge of one side of the oil tank away from the hydraulic oil pump and close to the refueling valve port.

[0019] A coal mining machine hydraulic system comprises a coal mining machine driving device, a lifting device and a coal mining machine hydraulic device, wherein the coal mining machine hydraulic device comprises a frame, a hydraulic oil pump, an oil tank, a control valve group, a first pressure oil outlet pipe and a second pressure oil outlet pipe, the hydraulic oil pump and the oil tank are both detachably connected to the frame, the control valve group is connected to the oil tank, one end of the hydraulic oil pump is provided with a first outlet and a second outlet, the control valve group is provided with a first inlet and a second inlet with the same opening direction, one end of the first pressure oil outlet pipe is connected to the first outlet, the other end of the first pressure oil outlet pipe is connected to the first inlet, and the opening direction of the first outlet is perpendicular to the opening direction of the first inlet; one end of the second pressure oil outlet pipe is connected to the second outlet, the other end of the second pressure oil outlet pipe is connected to the second inlet, and the opening direction of the second outlet is opposite to the opening direction of the second inlet and parallel to each other. The coal mining machine driving device is connected to the hydraulic oil pump in a transmission manner, and the lifting device is connected to the control valve group.

[0020] The present invention has the following beneficial effects:

[0021] The present invention provides a coal mining machine hydraulic device, wherein a hydraulic oil pump and an oil tank are both detachably connected to a frame, a control valve group is connected to the oil tank, a first liquid outlet is provided at one end of the hydraulic oil pump, a first liquid inlet and a second liquid inlet with the same opening direction are provided on the control valve group, one end of a first pressure oil outlet pipe is connected to the first liquid outlet, the other end of the first pressure oil outlet pipe is connected to the first liquid inlet, and the opening direction of the first liquid outlet is perpendicular to the opening direction of the first liquid inlet; one end of the second pressure oil outlet pipe is connected to the second liquid outlet, the other end of the second pressure oil outlet pipe is connected to the second liquid inlet, and the opening direction of the second liquid outlet is opposite to the opening direction of the second liquid inlet and parallel to each other. During use, the high-pressure oil discharged from the first pressure oil outlet pipe is discharged from the first outlet to the first inlet, and the opening directions of the first outlet and the first inlet are perpendicular, so the deflection angle of the main pressure oil outlet pipe is 90 degrees. Compared with the original deflection angle of 180 degrees, the high-pressure oil does not need to turn when it comes out of the first outlet, and will not form jitter at the valve port, avoiding damage to the valve port due to jitter, and improving the service life of the first pressure oil outlet pipe. The high-pressure oil discharged from the second pressure oil outlet pipe is discharged from the second outlet to the second inlet, and the opening directions of the second outlet and the second inlet are opposite, so that the second pressure oil outlet pipe can connect the second outlet and the second inlet in a straight line. Compared with the original deflection angle of 90 degrees, the high-pressure oil does not need to turn when it comes out of the second outlet, and will not form jitter at the valve port, avoiding damage to the valve port due to jitter, and improving the service life of the second pressure oil outlet pipe. Compared with the prior art, the coal mining machine hydraulic device provided by the present invention has a simple structure and is easy to disassemble and assemble. At the same time, it can reduce the connection angle of the hydraulic hose, solve the problem of easy damage of the hydraulic hose, and increase the service life of the hydraulic hose. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic structural diagram of a hydraulic device for a coal mining machine from a first perspective provided by a first embodiment of the present invention;

[0024] Figure 2 A schematic structural diagram of the hydraulic device for a coal mining machine provided by the first embodiment of the present invention from a second viewing angle;

[0025] Figure 3 for Figure 1 Schematic diagram of the structure of the control valve group;

[0026] Figure 4 for Figure 1 Partial view of the middle fuel tank.

[0027] Icons: 100-coal mining machine hydraulic device; 110-frame; 130-hydraulic oil pump; 131-pump body; 133-oil pipe joint seat; 135-first U-shaped clip; 137-second U-shaped clip; 150-oil tank; 151-oil temperature analyzer; 153-oil level analyzer; 155-fuel filling valve port; 160-control valve group; 161-valve group body; 163-operating handle; 170-first pressure oil outlet pipe; 180-second pressure oil outlet pipe; 190-lifting oil pipe. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the inventive product is usually placed when in use, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] As mentioned in the background technology, in the prior art, during the operation of the hydraulic hose, the coal mining machine is raised and most of the work is only a very short moment of inching adjustment. The high-pressure oil turns as soon as it exits, so the high-pressure liquid pipe here also shakes between supply and stop of the liquid. The frequency and number of times are constantly changing with the workload, and it is easy to cause damage to the pipe seal at the valve port and the U-shaped pipe clamp. In order to reduce the damage at these two places, the user unit often replaces the connecting joints and U-shaped pipe clamp seats of the two pipes with high-quality stainless steel materials and high-quality sealing rings, but it still cannot change the current situation of easy damage.

[0034] A coal mining machine hydraulic device proposed in the present invention directly solves the problems in the original technical solution. The main high-pressure hydraulic hose is changed from the original 90-degree angle to a direct connection after the pump outlet, which directly removes the 90-degree oblique impact force and pressure loss. The auxiliary high-pressure hydraulic hose is changed from the original 180 degrees to 90 degrees, which also removes the 90-degree oblique impact force and pressure loss.

[0035] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0036] First embodiment

[0037] See also Figure 1The present embodiment provides a coal mining machine hydraulic device 100, including a frame 110, a hydraulic oil pump 130, an oil tank 150, a control valve group 160, a first pressure oil outlet pipe 170, a second pressure oil outlet pipe 180 and a plurality of lifting oil pipes 190. The hydraulic oil pump 130 and the oil tank 150 can be detachably connected to the frame 110, the control valve group 160 is connected to the oil tank 150, one end of the hydraulic oil pump 130 is provided with a first liquid outlet and a second liquid outlet, and the control valve group 160 is provided with an opening The first liquid inlet and the second liquid inlet are in the same direction, one end of the first pressure oil outlet pipe 170 is connected to the first liquid outlet, the other end of the first pressure oil outlet pipe 170 is connected to the first liquid inlet, and the opening direction of the first liquid outlet is perpendicular to the opening direction of the first liquid inlet; one end of the second pressure oil outlet pipe 180 is connected to the second liquid outlet, the other end of the second pressure oil outlet pipe 180 is connected to the second liquid inlet, and the opening direction of the second liquid outlet is opposite to the opening direction of the second liquid inlet and parallel to each other. The control valve group 160 is also provided with a plurality of lifting connection ports, and the plurality of lifting oil pipes 190 are connected to the plurality of lifting connection ports one by one, and the opening direction of each lifting connection port is the same as the opening direction of the second liquid inlet.

[0038] In this embodiment, the first pressure oil outlet pipe 170 and the second pressure oil outlet pipe 180 are both flexible rubber pipes. When installed, the flexible rubber pipe near the first outlet is in a straight line, and the first pressure oil outlet pipe 170 gradually bends downward toward the first inlet and finally bends upward. The second pressure oil outlet pipe 180 is arranged in a straight line, directly connecting the second outlet and the second inlet, which greatly reduces the pressure loss of the second pressure oil outlet pipe 180.

[0039] In this embodiment, the lifting oil pipe 190 also adopts a flexible rubber tube for easy installation. At the same time, there are 4 lifting oil pipes 190 and 4 lifting connection ports. Of course, it can also be adjusted according to actual conditions and is not specifically limited here.

[0040] In this embodiment, the working outlet of the control valve group 160 is set horizontally to the left, so that the second liquid inlet can be set in the direction of the hydraulic oil pump 130, and the first liquid inlet is set downward. During installation, multiple lifting oil pipes 190 can be directly inserted into multiple lifting connection ports, that is, the lifting connection ports are directly connected to the lifting oil pipes 190 without an angle, and the multiple lifting oil pipes 190 then pass through the gap between the pump motor and the oil tank 150 to the rear side of the coal mining machine and are connected to the lifting oil cylinder. Compared with the original design, the lifting oil pipe 190 is directly connected to the control valve group 160 without an angle, and the high-pressure oil directly enters the lifting oil pipe 190 after leaving the control valve group 160, without an angled oblique impact force. The lifting oil pipe 190 is a hose and several hydraulic hoses can be bundled together, which can effectively buffer the impact and vibration of the hydraulic hose. It can effectively reduce the damage of hydraulic hoses and seals. Even if they are damaged, it is very simple to replace them. They can be replaced in more than ten minutes. Compared with the original design, it takes 3-4 hours to replace the hydraulic hose or seal when it is damaged, which greatly improves the production efficiency.

[0041] During use, the high-pressure oil discharged from the first pressure oil outlet pipe 170 is discharged from the first outlet to the first inlet. The opening directions of the first outlet and the first inlet are perpendicular, so the deflection angle of the main pressure oil outlet pipe is 90 degrees. Compared with the original deflection angle of 180 degrees, the high-pressure oil does not need to turn when it comes out of the first outlet, and will not form a vibration at the valve port, thereby avoiding damage to the valve port due to vibration, and improving the service life of the first pressure oil outlet pipe 170. The high-pressure oil discharged from the second pressure oil outlet pipe 180 is discharged from the second outlet to the second inlet. The opening directions of the second outlet and the second inlet are opposite, so that the second pressure oil outlet pipe 180 can connect the second outlet and the second inlet in a straight line. Compared with the original deflection angle of 90 degrees, the high-pressure oil does not need to turn when it comes out of the second outlet, and will not form a vibration at the valve port, thereby avoiding damage to the valve port due to vibration, and improving the service life of the second pressure oil outlet pipe 180.

[0042] See also Figure 2 The hydraulic oil pump 130 includes a pump body 131 and an oil pipe joint seat 133. The oil pipe joint seat 133 is fixedly connected to the pump body 131 and is arranged opposite to the control valve group 160. The first liquid outlet and the second liquid outlet are both arranged on the side of the oil pipe joint seat 133 close to the control valve group 160. The oil pipe joint seat 133 is connected to the control valve group 160 through the first pressure oil outlet pipe 170 and the second pressure oil outlet pipe 180.

[0043] First U-shaped clips 135 are provided at both ends of the first pressure oil outlet pipe 170 , and the first pressure oil outlet pipe 170 is connected to the hydraulic oil pump 130 and the control valve group 160 respectively through the first U-shaped clips 135 .

[0044] Second U-shaped clips 137 are provided at both ends of the second pressure oil outlet pipe 180 , and the second pressure oil outlet pipe 180 is connected to the hydraulic oil pump 130 and the control valve group 160 respectively through the second U-shaped clips 137 .

[0045] In this embodiment, the first U-shaped clip 135 , the second U-shaped clip 137 , the hose and other accessories all meet national standards, which can greatly reduce the manufacturing cost.

[0046] See also Figure 3 The control valve group 160 includes a valve group body 161 and an operating handle 163. The valve group body 161 has a plurality of operating valve heads arranged in parallel. The operating handle 163 is connected to the valve group body 161 and is used to control the opening and closing of the plurality of operating valve heads.

[0047] In this embodiment, the operating handle is bolted to the valve group body 161. The operating handle 163 of the original valve group design is connected with two fixed pins. When dealing with oil leakage of hydraulic hose, these two fixed pins must be removed. There is also a split pin on the fixed pin, which is troublesome to disassemble and small parts are easy to lose. In this new technical solution, the operating valve handle is bolted, which is very convenient to disassemble.

[0048] See also Figure 4 The oil tank 150 is provided with an oil temperature analyzer 151 and an oil level analyzer 153. The oil tank 150 is also provided with a refueling valve port 155. The oil temperature analyzer 151 and the oil level analyzer 153 are both arranged on the edge of one side of the oil tank 150 away from the hydraulic oil pump 130 and close to the refueling valve port 155.

[0049] In the original design, the refueling valve port 155, the oil temperature analyzer 151 and the oil level analyzer 153 are almost blocked by the hydraulic hose. The refueling valve port 155 is almost always used as a decoration in coal mines. The oil temperature analyzer 151 and the oil level analyzer 153 can only be checked after the hose is moved by hand. After the implementation of this new technology solution, these two places can be directly observed, the refueling port can be directly changed out to refuel, and the oil temperature analyzer 151 and the oil level analyzer 153 can be directly observed, which is convenient for viewing.

[0050] In this embodiment, the oil temperature analyzer 151 has a temperature sensor, which extends into the oil tank 150 to measure the temperature of the pressure oil in the oil tank 150 and displays it through the temperature display on the oil temperature analyzer 151, so as to facilitate inspection by staff.

[0051] In this embodiment, the oil level analyzer 153 has an oil level detection buoy, which is arranged in the oil tank 150 to detect the oil level of the pressure oil, and sends out an alarm signal when the oil level is lower than the warning line.

[0052] In summary, this embodiment provides a coal mining machine hydraulic device 100, the second pressure oil outlet pipe 180 is changed from the original 90-degree angle to a direct connection to the pump outlet, directly removing the 90-degree oblique impact force and pressure loss, and the first pressure oil outlet pipe 170 is changed from the original 180 degrees to 90 degrees, also removing the 90-degree oblique impact force and pressure loss. As shown in the improved hydraulic system layout diagram above, the AB working outlet in the overall valve group is changed from the original vertical downward to horizontal to the left, and the four hydraulic hoses responsible for the lifting of the rocker arm on both sides of the coal mining machine can be directly inserted into the joint seat, that is, the valve group oil outlet is directly connected to the hydraulic hose without an angle, and the hydraulic hose then passes through the gap between the pump motor and the oil tank 150 to the rear side of the coal mining machine and is connected to the lifting cylinder. During use, the high-pressure oil discharged from the first pressure oil outlet pipe 170 is discharged from the first outlet to the first inlet. The opening directions of the first outlet and the first inlet are perpendicular, so the deflection angle of the main pressure oil outlet pipe is 90 degrees. Compared with the original deflection angle of 180 degrees, the high-pressure oil does not need to turn when it comes out of the first outlet, and will not form a vibration at the valve port, thereby avoiding damage to the valve port due to vibration, and improving the service life of the first pressure oil outlet pipe 170. The high-pressure oil discharged from the second pressure oil outlet pipe 180 is discharged from the second outlet to the second inlet. The opening directions of the second outlet and the second inlet are opposite, so that the second pressure oil outlet pipe 180 can connect the second outlet and the second inlet in a straight line. Compared with the original deflection angle of 90 degrees, the high-pressure oil does not need to turn when it comes out of the second outlet, and will not form a vibration at the valve port, thereby avoiding damage to the valve port due to vibration, and improving the service life of the second pressure oil outlet pipe 180.

[0053] Second embodiment

[0054] The present embodiment provides a coal mining machine hydraulic system, including a coal mining machine driving device, a lifting device and a coal mining machine hydraulic device 100, wherein the basic structure and principle of the coal mining machine hydraulic device 100 and the technical effects produced are the same as those of the first embodiment. For the sake of brief description, for parts not mentioned in this embodiment, reference may be made to the corresponding contents in the first embodiment.

[0055] The coal mining machine hydraulic device 100 includes a frame 110, a hydraulic oil pump 130, an oil tank 150, a control valve group 160, a first pressure oil outlet pipe 170 and a second pressure oil outlet pipe 180. The hydraulic oil pump 130 and the oil tank 150 are both detachably connected to the frame 110. The control valve group 160 is connected to the oil tank 150. One end of the hydraulic oil pump 130 is provided with a first liquid outlet and a second liquid outlet. The control valve group 160 is provided with a first liquid inlet and a second liquid inlet with the same opening direction. One end of the first pressure oil outlet pipe 170 is connected to the first liquid outlet, and the other end of the first pressure oil outlet pipe 170 is connected to the first liquid inlet, and the opening direction of the first liquid outlet is perpendicular to the opening direction of the first liquid inlet; one end of the second pressure oil outlet pipe 180 is connected to the second liquid outlet, and the other end of the second pressure oil outlet pipe 180 is connected to the second liquid inlet, and the opening direction of the second liquid outlet is opposite to the opening direction of the second liquid inlet and parallel to each other. The coal mining machine driving device is connected to the hydraulic oil pump 130 by transmission, and the lifting device is connected to the control valve group 160.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydraulic device for a coal mining machine, characterized in that: It comprises a frame, a hydraulic oil pump, an oil tank, a control valve group, a first pressure oil outlet pipe and a second pressure oil outlet pipe, the hydraulic oil pump and the oil tank are both detachably connected to the frame, the control valve group is connected to the oil tank, one end of the hydraulic oil pump is provided with a first outlet and a second outlet, the control valve group is provided with a first inlet and a second inlet, one end of the first pressure oil outlet pipe is connected to the first outlet, the other end of the first pressure oil outlet pipe is connected to the first inlet, and the opening direction of the first outlet is perpendicular to the opening direction of the first inlet; one end of the second pressure oil outlet pipe is connected to the second outlet, the other end of the second pressure oil outlet pipe is connected to the second inlet, and the opening direction of the second outlet is opposite to the opening direction of the second inlet and parallel to each other; The first pressure oil outlet pipe is a main pressure oil outlet pipe, and the deflection angle is 90° to avoid shaking at the valve port, and the second pressure oil outlet pipe is an auxiliary pressure oil outlet pipe, which connects the second outlet and the second inlet in a straight line to avoid shaking at the valve port; The oil tank is provided with an oil temperature analyzer and an oil level analyzer, and is also provided with a refueling valve port. The oil temperature analyzer and the oil level analyzer are both arranged on an edge of a side of the oil tank away from the hydraulic oil pump and close to the refueling valve port.

2. The hydraulic device for coal mining machine according to claim 1, characterized in that: The hydraulic oil pump includes a pump body and an oil pipe joint seat, the oil pipe joint seat is fixedly connected to the pump body and arranged opposite to the control valve group, the first liquid outlet and the second liquid outlet are both arranged on the side of the oil pipe joint seat close to the control valve group, and the oil pipe joint seat is connected to the control valve group through the first pressure oil outlet pipe and the second pressure oil outlet pipe.

3. The hydraulic device for coal mining machine according to claim 1 or 2, characterized in that: The first pressure oil outlet pipe and the second pressure oil outlet pipe are both flexible rubber hoses.

4. The hydraulic device for coal mining machine according to claim 1 or 2, characterized in that: Both ends of the first pressure oil outlet pipe are provided with first U-shaped clips, and the first pressure oil outlet pipe is connected to the hydraulic oil pump and the control valve group respectively through the first U-shaped clips; both ends of the second pressure oil outlet pipe are provided with second U-shaped clips, and the second pressure oil outlet pipe is connected to the hydraulic oil pump and the control valve group respectively through the second U-shaped clips.

5. The hydraulic device for coal mining machine according to claim 1, characterized in that: The coal mining machine hydraulic device also includes a plurality of lifting oil pipes, and a plurality of lifting connection ports are also provided on the control valve group. The plurality of lifting oil pipes are connected to the plurality of lifting connection ports one by one, and the opening direction of each lifting connection port is the same as the opening direction of the second liquid inlet.

6. The hydraulic device for coal mining machine according to claim 5, characterized in that: The plurality of lifting oil pipes are all flexible rubber pipes.

7. The hydraulic device for coal mining machine according to claim 1, characterized in that: The control valve group includes a valve group body and an operating handle. The valve group body has a plurality of operating valve heads arranged in parallel. The operating handle is connected to the valve group body and is used to control the opening and closing of the plurality of operating valve heads.

8. The hydraulic device for coal mining machine according to claim 7, characterized in that: The operating handle is connected to the valve group body by bolts.

9. A coal mining machine hydraulic system, characterized in that: It comprises a coal mining machine driving device, a lifting device and a coal mining machine hydraulic device as described in any one of claims 1 to 8, wherein the coal mining machine driving device is transmission-connected to the hydraulic oil pump, and the lifting device is connected to the control valve group.

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