Method and system for coal mining machine oil liquid two-way circulation self-cooling

Abstract

The present application relates to a kind of coal cutter oil liquid two-way circulation self-cooling method and system, the method is from rocker arm gear oil cavity suction high temperature oil liquid after transmission to traction gear oil cavity, while from traction gear oil cavity suction equal amount of low temperature oil liquid after transmission to rocker arm gear oil cavity;The system includes rocker arm high temperature oil path, rocker arm low temperature oil path, traction high temperature oil path, traction low temperature oil path, pump I and pump II, the import of rocker arm high temperature oil path is connected with the import of traction high temperature oil path by pump I, and the export of rocker arm high temperature oil path and the export of traction high temperature oil path are communicated with rocker arm gear oil cavity and traction gear oil cavity respectively, the import of traction low temperature oil path is connected with the import of rocker arm low temperature oil path by pump II, and the export of traction low temperature oil path and the export of rocker arm low temperature oil path are communicated with traction gear oil cavity and rocker arm gear oil cavity respectively.The present application can solve the problem of high power density coal cutter rocker arm high temperature, improve the working reliability of coal cutter rocker arm, prolong the service life of rocker arm.

Description

TECHNICAL FIELD

[0001] The present application relates to a cooling method and a cooling system for a coal mining machine, and belongs to the technical field of coal mining machines. BACKGROUND

[0002] In order to meet the requirements of high yield and high efficiency of coal mines and the needs of mining complex coal seams, the vibration condition of the coal mining machine during operation is poor, the mining intensity is sharply increased, and the reliability is high, which leads to the increasing of the installed power density of the coal mining machine. The installed power of the coal mining machine mainly includes the power of the rocker arm and the traction power, and the power of the rocker arm accounts for about 80% of the installed power. The cavity of the rocker arm is small, the heat generation is large, the temperature is high during operation, and especially the temperature of the gear in the high-speed area is close to 100℃. Therefore, the rocker arm of the coal mining machine must be cooled, otherwise it is easy to cause serious faults such as burning of the bearing, oil leakage due to premature failure of the seal caused by high temperature, and gear wear.

[0003] Although a large number of measures have been taken in the industry to solve the cooling problem, some of them increase the water channel on the rocker arm shell for cooling, but weaken the strength of the rocker arm shell, causing deformation and other faults of the rocker arm shell. Due to the poor vibration of coal mining, the welded water channel is often prone to cracking and leaking, and even causes oil emulsification. Some increase small tube coolers in the rocker arm gear cavity to reduce the temperature of the rocker arm oil, which either has no obvious cooling effect or causes the welded joints to crack under vibration conditions, resulting in premature emulsification of the rocker arm gear oil, reducing the service life of the gear, and seriously affecting the overall reliability of the rocker arm. Under the conditions of high yield and high efficiency or complex and poor working conditions, the above-mentioned measures cannot well solve the problem of high temperature of the rocker arm oil, and it is difficult to adapt to the needs of modern mining of high-power-density coal mining machines. SUMMARY

[0004] The present application aims to provide a coal mining machine oil liquid two-way circulation self-cooling method and system to solve the problem of high temperature of the rocker arm oil of high-power-density coal mining machines, improve the working reliability of the rocker arm of the coal mining machine, and prolong the service life of the rocker arm.

[0005] The main technical solutions of the present application are as follows:

[0006] A coal mining machine oil liquid two-way circulation self-cooling method, high-temperature oil liquid is sucked from the rocker arm gear oil cavity, filtered and transmitted to the traction gear oil cavity, at the same time, an equal amount of low-temperature oil liquid is sucked from the traction gear oil cavity, filtered and transmitted to the rocker arm gear oil cavity, and the low-temperature oil liquid from the traction gear oil cavity continuously cools the high-temperature oil liquid from the rocker arm gear oil cavity.

[0007] The first motor pump and the second motor pump are used to suck high-temperature oil liquid and low-temperature oil liquid respectively, and a pressure oil source from the hydraulic height adjustment system of the coal mining machine is used to supply power to the first motor pump and the second motor pump.

[0008] The main reversing valve is added at the outlet of the pressure oil source, when the main reversing valve is in the first working position, the P port, the O port and the B port of the main reversing valve are communicated, the A port is not communicated, when the main reversing valve is in the second working position, the P port and the B port are communicated, the O port and the A port are not communicated, the first motor pump and the second motor pump are of the same type, the hydraulic oil inlet of the first motor pump is connected with the O port, the hydraulic oil outlet of the first motor pump is connected with the hydraulic oil inlet of the second motor pump, the hydraulic oil outlet of the second motor pump is connected with the oil tank of the hydraulic height adjusting system, the gear oil inlet and the gear oil outlet of the first motor pump are connected with the rocker arm gear oil cavity and the traction gear oil cavity respectively, the gear oil inlet and the gear oil outlet of the second motor pump are connected with the traction gear oil cavity and the rocker arm gear oil cavity respectively, the P port is connected with the pressure oil source, the B port is connected with the oil inlet of the height adjusting cylinder of the hydraulic height adjusting system, and the A port is connected with the oil tank of the hydraulic height adjusting system; when the coal mining machine does not need to be adjusted in height, the main reversing valve is in the first working position, the pressure oil source supplies oil to the first motor pump and the second motor pump, so that the first motor pump and the second motor pump continuously work, when the coal mining machine needs to be adjusted in height, the main reversing valve is in the second working position, so that the pressure oil source only supplies oil to the height adjusting cylinder, and the first motor pump and the second motor pump stop working.

[0009] An overflow valve is arranged between the hydraulic oil inlet of the first motor pump and the hydraulic oil outlet of the second motor pump, and the inlet of the overflow valve is communicated with the hydraulic oil inlet of the first motor pump.

[0010] The main reversing valve preferably adopts a K-type three-position four-way reversing valve with a neutral function, when the main reversing valve is in the neutral position and the left position, the P port, the O port and the B port of the main reversing valve are communicated, the A port is not communicated, when the main reversing valve is in the right position, the P port and the B port are communicated, the O port and the A port are not communicated.

[0011] The output flow of the first motor pump and the second motor pump is detected respectively, when the coal mining machine does not need to be adjusted in height, when the first motor pump and the second motor pump have output flow and the output flow of the two is equal, it represents that the oil liquid bidirectional circulation self-cooling system of the coal mining machine is in the normal working state, when the difference of the output flow of the first motor pump and the second motor pump exceeds a certain amount or is 0, it represents that the oil liquid bidirectional circulation self-cooling system of the coal mining machine has a fault.

[0012] The coal mining machine oil liquid bidirectional circulation self-cooling system comprises a rocker arm high-temperature oil path, a rocker arm low-temperature oil path, a traction high-temperature oil path, a traction low-temperature oil path, a pump I and a pump II, the outlet of the rocker arm high-temperature oil path is connected with the inlet of the traction high-temperature oil path through the pump I, the inlet of the rocker arm high-temperature oil path and the outlet of the traction high-temperature oil path are communicated with a rocker arm gear oil cavity and a traction gear oil cavity respectively, the outlet of the traction low-temperature oil path is connected with the inlet of the rocker arm low-temperature oil path through the pump II, the inlet of the traction low-temperature oil path and the outlet of the rocker arm low-temperature oil path are communicated with the traction gear oil cavity and the rocker arm gear oil cavity respectively, the inlet of the rocker arm high-temperature oil path and the outlet of the rocker arm low-temperature oil path are arranged at different positions of the rocker arm gear oil cavity respectively, and the outlet of the traction high-temperature oil path and the inlet of the traction low-temperature oil path are arranged at different positions of the traction gear oil cavity respectively.

[0013] First and second filters are arranged on the rocker arm high-temperature oil path and the traction low-temperature oil path respectively.

[0014] The rocker arm high-temperature oil path, the rocker arm low-temperature oil path, the traction high-temperature oil path and the traction low-temperature oil path all adopt oil pipes.

[0015] The coal mining machine oil liquid bidirectional circulation self-cooling system further comprises a hydraulic oil series oil path and a main reversing valve, when the main reversing valve is in a first working position, the P port, the O port and the B port of the main reversing valve are communicated, and the A port is not communicated, when the main reversing valve is in a second working position, the P port and the B port are communicated, and the O port and the A port are not communicated, the pump I and the pump II adopt first and second motor pumps of the same type, the hydraulic oil inlet of the first motor pump is connected with the O port, the hydraulic oil outlet of the first motor pump is connected with the hydraulic oil inlet of the second motor pump, the hydraulic oil outlet of the second motor pump is connected with an oil tank of a hydraulic height adjusting system, the gear oil inlet and the gear oil outlet of the first motor pump are connected with the outlet of the rocker arm high-temperature oil path and the inlet of the traction high-temperature oil path respectively, the gear oil inlet and the gear oil outlet of the second motor pump are connected with the outlet of the traction low-temperature oil path and the inlet of the rocker arm low-temperature oil path respectively, the P port is connected with a pressure oil source of the hydraulic height adjusting system of the coal mining machine, the B port is connected with an oil inlet of a height adjusting oil cylinder of the hydraulic height adjusting system, and the A port is connected with an oil tank of the hydraulic height adjusting system, first and second flow sensors are arranged on the rocker arm low-temperature oil path and the traction high-temperature oil path respectively.

[0016] The main reversing valve preferably adopts a K-type three-position four-way reversing valve with a neutral function, when the main reversing valve is in the neutral position and the left position, the P port, the O port and the B port of the main reversing valve are communicated, and the A port is not communicated, when the main reversing valve is in the right position, the P port and the B port are communicated, and the O port and the A port are not communicated.

[0017] The coal mining machine oil liquid bidirectional circulation self-cooling system further comprises a hydraulic oil inlet path, a hydraulic oil return path and an overflow valve, the O port is connected to the hydraulic oil inlet of the first motor pump through the hydraulic oil inlet path, the hydraulic oil outlet of the second motor pump is connected to the oil tank of the hydraulic height adjustment system through the hydraulic oil return path, the overflow valve is arranged between the hydraulic oil inlet of the first motor pump and the hydraulic oil outlet of the second motor pump, and the inlet of the overflow valve is communicated with the hydraulic oil inlet of the first motor pump.

[0018] The hydraulic oil inlet path, the hydraulic oil series path and the hydraulic oil return path all adopt oil pipes.

[0019] The coal mining machine oil liquid bidirectional circulation self-cooling system has the following beneficial effects:

[0020] The coal mining machine oil liquid bidirectional circulation self-cooling system has the following beneficial effects:

[0021] The coal mining machine oil liquid bidirectional circulation self-cooling system has the following beneficial effects:

[0022] The coal mining machine oil liquid bidirectional circulation self-cooling system has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 Fig. 1 is a structural schematic view of an embodiment of the coal mining machine oil liquid bidirectional circulation self-cooling system of the present application;

[0024] Fig. 2 Fig. 2 is a principle view of the coal mining machine oil liquid bidirectional circulation self-cooling system of the present application;

[0025] Fig. 3 Fig. 3 is a structural schematic view of the main reversing valve.

[0026] REFERENCE NUMERALS:

[0027] 1. rocker high temperature oil circuit; 2. rocker low temperature oil circuit; 3. traction low temperature oil circuit; 4. first filter; 5. second filter; 6. first flow sensor; 7. second flow sensor; 8. traction high temperature oil circuit; 9. first motor pump; 10. second motor pump; 11. hydraulic oil inlet circuit; 12. hydraulic oil series circuit; 13. hydraulic oil return circuit; 14. overflow valve; 15. main reversing valve. DETAILED DESCRIPTION

[0028] The present application discloses a kind of coal winning machine oil liquid bidirectional circulation self-cooling method (can be simply referred to as self-cooling method), refer to Figs. 1-3 The method is from rocker gear oil cavity suction high temperature oil, is transmitted to traction gear oil cavity after filtering, simultaneously from traction gear oil cavity suction equal amount of low temperature oil, is transmitted to rocker gear oil cavity after filtering, by heat exchange with low temperature oil from traction gear oil cavity continuously cooling high temperature oil from rocker gear oil cavity, to realize the cooling of coal winning machine rocker.The equal amount of low temperature oil from traction gear oil cavity is suctioned and is transmitted to rocker gear oil cavity, it is to make up the oil from rocker gear oil cavity suction, guarantee the oil amount inside rocker shell and traction box keeps dynamic balance.In order to guarantee heat exchange function more fully, the position of high temperature oil from rocker gear oil cavity is different from the position of low temperature oil into rocker gear oil cavity, and for the same reason, the position of low temperature oil from traction gear oil cavity is also different from the position of high temperature oil into traction gear oil cavity.

[0029] Because the traction power of coal winning machine accounts for about 15% of installed power, compared with rocker power, traction power is small, heat quantity is small, and traction gear cavity is large, heat dissipation area is large, therefore traction gear cavity temperature is lower, usually working temperature does not exceed 50 DEG C.The present application utilizes low temperature oil of traction gear oil cavity to cool down high temperature oil of rocker gear oil cavity, does not need to increase water channel, also does not need to add pipe cooler, thus can avoid various problems of existing cooling measures.

[0030] Further, preferably, high temperature oil and low temperature oil are respectively suctioned by first motor pump 9 and second motor pump 10, and a way of pressure oil is led out from the pressure oil source of hydraulic height adjustment system of coal winning machine to supply the motor part of first motor pump and second motor pump to generate power to supply the pump part of first motor pump and second motor pump.The motor pump includes motor part and pump part, the main shafts of the two are coaxially connected, the inlet and outlet of motor part are respectively hydraulic oil inlet and hydraulic oil outlet, and the inlet and outlet of pump part are respectively gear oil inlet and gear oil outlet.The working principle of motor pump is that hydraulic oil drives motor part to rotate, and then drives pump part to rotate synchronously, and pump part absorbs oil from gear box and outputs it through gear oil outlet.

[0031] Further, a main reversing valve 15 is preferably added at the outlet of the pressure oil source. When the main reversing valve is in the first working position, the P port, the O port and the B port of the main reversing valve are communicated, and the A port is not communicated. When the main reversing valve is in the second working position, the P port and the B port are communicated, and the O port and the A port are not communicated. The first motor pump and the second motor pump are of the same type. The hydraulic oil inlet of the first motor pump is connected to the O port, the hydraulic oil outlet of the first motor pump is connected to the hydraulic oil inlet of the second motor pump, and the hydraulic oil outlet of the second motor pump is connected to the oil tank of the hydraulic height adjustment system (which can be referred to as the oil tank hereinafter). That is, the motor parts of the first motor pump and the second motor pump are connected in series, so that the amount of oil sucked and output by the first motor pump and the second motor pump is consistent. The gear oil inlet and the gear oil outlet of the first motor pump are respectively connected to the rocker arm gear oil cavity and the traction gear oil cavity, and the gear oil inlet and the gear oil outlet of the second motor pump are respectively connected to the traction gear oil cavity and the rocker arm gear oil cavity. The P port is connected to the pressure oil source, the B port is connected to the oil inlet of the height adjustment cylinder of the hydraulic height adjustment system, and the A port is connected to the oil tank of the hydraulic height adjustment system. When the coal mining machine does not need to be adjusted in height, the main reversing valve is in the first working position, and the pressure oil source supplies oil to the first motor pump and the second motor pump to convert into kinetic energy, so that the first motor pump and the second motor pump continuously work, the low-temperature oil in the traction gear oil cavity continuously cools the high-temperature oil in the rocker arm gear oil cavity, and the rocker arm of the coal mining machine is continuously cooled; when the coal mining machine needs to be adjusted in height, the main reversing valve is in the second working position, so that the pressure oil source only supplies oil to the height adjustment cylinder, and the first motor pump and the second motor pump stop working, and thus the cooling of the rocker arm is stopped.

[0032] An overflow valve 14 is arranged between the hydraulic oil inlet of the first motor pump and the hydraulic oil outlet of the second motor pump, and the inlet of the overflow valve is communicated with the hydraulic oil inlet of the first motor pump. The overflow valve plays a protection role. For example, when the motor parts of the first motor pump and the second motor pump do not work due to special circumstances, and the hydraulic oil pressure exceeds the set pressure of the overflow valve 14, the overflow valve can prevent the pressure of the entire hydraulic system from rising, so that the hydraulic pump of the hydraulic system continuously works in a high-pressure state, causing the temperature of the hydraulic oil to abnormally rise, the hydraulic pump to be damaged, and the like.

[0033] Further, in order to make the structural sizes of the multiple reversing valves in the hydraulic system consistent as much as possible, so that the valve bodies can be interchangeable and the types of parts are reduced, the main reversing valve in the embodiment shown in the drawings preferably adopts a K-type three-position four-way reversing valve with a neutral function. When the main reversing valve is in the neutral position and the left position, the P port, the O port and the B port of the main reversing valve are communicated, and the A port is not communicated. When the main reversing valve is in the right position, the P port and the B port are communicated, and the O port and the A port are not communicated.

[0034] In the above connection and configuration, the output flow of the first motor pump and the second motor pump can be detected respectively, and the running condition of the first motor pump and the second motor pump is identified and judged by the electric control system of the coal mining machine. The specific judgment standard is: when the first motor pump and the second motor pump have output flow and the output flow of the two is equal, it indicates that the oil liquid bidirectional circulation self-cooling system of the coal mining machine is in a normal working state when the coal mining machine does not need to be adjusted; when the difference between the output flow of the first motor pump and the second motor pump exceeds a certain amount or both are 0, it indicates that the oil liquid bidirectional circulation self-cooling system of the coal mining machine has a fault. This fault judgment method is simple and easy to implement, and reduces the maintenance difficulty of the self-cooling system.

[0035] The application further discloses an oil liquid bidirectional circulation self-cooling system (which can be referred to as a self-cooling system) of a coal mining machine, which comprises a rocker arm high-temperature oil path 1, a rocker arm low-temperature oil path 2, a traction high-temperature oil path 8, a traction low-temperature oil path 3, a pump I and a pump II. Figs. 1-3 The outlet of the rocker arm high-temperature oil path is connected with the inlet of the traction high-temperature oil path through the pump I, and the inlet of the rocker arm high-temperature oil path and the outlet of the traction high-temperature oil path are communicated with a rocker arm gear oil cavity and a traction gear oil cavity respectively. The outlet of the traction low-temperature oil path is connected with the inlet of the rocker arm low-temperature oil path through the pump II, and the inlet of the traction low-temperature oil path and the outlet of the rocker arm low-temperature oil path are communicated with the traction gear oil cavity and the rocker arm gear oil cavity respectively. The self-cooling system can be used to realize the self-cooling method. The rocker arm high-temperature oil path 1, the pump I and the traction high-temperature oil path are used to transmit the high-temperature oil liquid in the rocker arm gear oil cavity to the traction gear oil cavity, and the traction low-temperature oil path 3, the pump II and the rocker arm low-temperature oil path 2 are used to transmit the low-temperature oil liquid in the traction gear oil cavity to the rocker arm gear oil cavity. The self-cooling system does not need water cooling, and the high oil temperature of the rocker arm can be reduced by the low-temperature gear oil. The self-cooling system does not have an external cooler or a cooling water channel, so there is no risk of cracking and leakage under harsh working conditions such as vibration, which not only meets the purpose of high-temperature cooling of the oil liquid of the rocker arm, but also improves the reliability of the working of the rocker arm and prolongs the service life of the rocker arm. The inlet of the rocker arm high-temperature oil path and the outlet of the rocker arm low-temperature oil path are arranged at different positions of the rocker arm gear oil cavity respectively, and the outlet of the traction high-temperature oil path and the inlet of the traction low-temperature oil path are arranged at different positions of the traction gear oil cavity respectively. As common knowledge, the pump I and the pump II are usually driven by corresponding motors respectively.

[0036] First and second filters 4 and 5 are respectively arranged on the rocker arm high-temperature oil path and the traction low-temperature oil path, and are used for filtering the high-temperature oil liquid and the low-temperature oil liquid respectively, so as to ensure the cleanliness of the oil liquid when being transmitted between the rocker arm housing and the inside of the traction box, so as to prevent impurities from being brought in.

[0037] The rocker arm high-temperature oil path, the rocker arm low-temperature oil path, the traction high-temperature oil path and the traction low-temperature oil path are preferably oil pipes.

[0038] Further, the coal mining machine oil liquid two-way circulation self-cooling system further comprises a hydraulic oil series oil circuit 12 and a main reversing valve 15. When the main reversing valve is in a first working position, the P port, the O port and the B port of the main reversing valve are communicated, and the A port is not communicated. When the main reversing valve is in a second working position, the P port and the B port are communicated, and the O port and the A port are not communicated. Fig. 1 In the embodiment shown in the drawings, the pump I and the pump II adopt the same type of first motor pump 9 and second motor pump 10 respectively. The hydraulic oil inlet of the first motor pump is connected to the O port, the hydraulic oil outlet of the first motor pump is connected to the hydraulic oil inlet of the second motor pump, and the hydraulic oil outlet of the second motor pump is connected to the oil tank of the hydraulic height adjustment system, which is equivalent to that the motor parts of the first motor pump and the second motor pump are in series, so that the amount of oil sucked and output by the two is consistent. The gear oil inlet and the gear oil outlet of the first motor pump are respectively connected to the outlet of the rocker arm high-temperature oil circuit and the inlet of the traction high-temperature oil circuit, and the gear oil inlet and the gear oil outlet of the second motor pump are respectively connected to the outlet of the traction low-temperature oil circuit and the inlet of the rocker arm low-temperature oil circuit. The P port is connected to the pressure oil source of the hydraulic height adjustment system of the coal mining machine itself, the B port is connected to the oil inlet of the height adjustment cylinder of the hydraulic height adjustment system, and the A port is connected to the oil tank of the hydraulic height adjustment system. The main reversing valve is fixed to the integrated valve group in the height adjustment system of the coal mining machine. When the coal mining machine does not need to be adjusted in height, the main reversing valve is allowed to be in the first working position, the pressure oil source supplies oil to the motor parts of the first motor pump and the second motor pump, so that the first motor pump and the second motor pump continuously work, and the rocker arm of the coal mining machine is continuously cooled; when the coal mining machine needs to be adjusted in height, the main reversing valve is allowed to be in the second working position, so that the pressure oil source only supplies oil to the height adjustment cylinder, and the first motor pump and the second motor pump stop working, and thus the cooling of the rocker arm is stopped. Since the pressure oil source of the hydraulic height adjustment system of the coal mining machine itself is used to provide power for the self-cooling system, the structure of the system is relatively simple. Moreover, the main reversing valve is used to continuously and forcibly circulate and cool the rocker arm gear oil, and the height adjustment function of the coal mining machine is not affected.

[0039] In the embodiment shown in the drawings, the hydraulic height adjustment system is provided with a Y-type hand hydraulic reversing valve for controlling the action of the height adjustment cylinder. The B port of the main reversing valve is connected to the oil inlet of the Y-type hand hydraulic reversing valve. When the Y-type hand hydraulic reversing valve is in the neutral position, the height adjustment cylinder does not supply oil,

[0040] The first flow sensor 6 and the second flow sensor 7 are respectively arranged on the rocker arm low-temperature oil circuit and the traction high-temperature oil circuit. The output flow of the first motor pump and the second motor pump is detected by the first flow sensor 6 and the second flow sensor 7 respectively, and the running condition of the first motor pump and the second motor pump is identified by the electric control system of the coal mining machine, so as to facilitate the inspection and maintenance of the self-cooling system. Since the first motor pump and the second motor pump are of the same type and are connected in series, the first motor pump and the second motor pump should theoretically have the same output flow. Therefore, when the difference between the actual detected output flows of the first motor pump and the second motor pump does not exceed a certain amount, it is indicated that the oil liquid bidirectional circulation self-cooling system of the coal mining machine is in a normal working condition, and when the difference between the output flows of the first motor pump and the second motor pump exceeds a certain amount, it is indicated that the oil liquid bidirectional circulation self-cooling system of the coal mining machine has a fault.

[0041] The main reversing valve is preferably a K-type three-position four-way reversing valve with a neutral function. When the main reversing valve is in the neutral position and the left position, the P port, the O port and the B port of the main reversing valve are communicated, and the A port is not communicated. When the main reversing valve is in the right position, the P port and the B port are communicated, and the O port and the A port are not communicated.

[0042] The oil liquid bidirectional circulation self-cooling system of the coal mining machine can further comprise a hydraulic oil inlet circuit 11, a hydraulic oil return circuit 13 and an overflow valve 14. Fig. 1 In the embodiment, the O port is connected to the hydraulic oil inlet of the first motor pump through the hydraulic oil inlet circuit, the hydraulic oil outlet of the second motor pump is connected to the oil tank of the hydraulic pressure regulating system through the hydraulic oil return circuit, and the overflow valve 14 is arranged between the hydraulic oil inlet of the first motor pump and the hydraulic oil outlet of the second motor pump, and the inlet of the overflow valve is communicated with the hydraulic oil inlet of the first motor pump. The overflow valve plays a protection role. When the motor part of the first motor pump and the second motor pump does not work due to special circumstances, the hydraulic oil pressure exceeds the set pressure of the overflow valve 14, and the overflow valve is overflowed, so as to prevent the pressure of the entire hydraulic system from rising to cause the hydraulic pump to work continuously at high pressure, resulting in high hydraulic oil temperature, hydraulic pump damage and other faults. When the main reversing valve is in the neutral position, the oil liquid flowing out of the O port drives the first motor pump to work through the hydraulic oil inlet circuit 11, and then flows into the second motor pump 10 through the hydraulic oil series circuit 12 and drives the second motor pump to work, and then flows out back to the oil tank through the hydraulic oil return circuit 13.

[0043] The hydraulic oil inlet circuit, the hydraulic oil series circuit and the hydraulic oil return circuit are preferably oil pipes.

[0044] The main reversing valve 15 can include a valve body 1501, a handle 1502, a handle seat 1503, a spring assembly 1504, a solenoid valve 1505, a valve core 1506, a threaded nut 1507 and a joint seat 1508. In the case of needing to adjust the height, the valve core 1506 is in the right position by overcoming the spring force of the spring assembly 1504 through external force, and the high-pressure oil pumped out flows through the P port to the B port to the Y-type hand hydraulic reversing valve in the height adjustment system. At this time, the hand hydraulic reversing valve is in the left position or the right position, so that the height adjustment oil cylinder corresponding to the action of the hand hydraulic reversing valve acts, and the corresponding function is completed. If the valve core 1506 is in the left position by overcoming the spring force of the spring assembly 1504 through external force due to misoperation, the effect is the same as when the valve core 1506 is in the middle position.

Claims

1. A method for self-cooling of oil liquid two-way circulation of a coal mining machine, characterized in that: The high-temperature oil liquid is sucked from the rocker gear oil cavity, filtered and transmitted to the traction gear oil cavity, and at the same time, the low-temperature oil liquid is sucked from the traction gear oil cavity, filtered and transmitted to the rocker gear oil cavity, the low-temperature oil liquid from the traction gear oil cavity is used to continuously cool the high-temperature oil liquid from the rocker gear oil cavity, the first motor pump and the second motor pump are used to suck the high-temperature oil liquid and the low-temperature oil liquid respectively, a pressure oil source of a hydraulic height adjusting system of the coal mining machine is used to draw a pressure oil to power the first motor pump and the second motor pump, a main reversing valve is additionally arranged at an outlet of the pressure oil source, when the main reversing valve is in a first working position, a P port, an O port and a B port of the main reversing valve are communicated, an A port is not communicated, when the main reversing valve is in a second working position, the P port and the B port are communicated, the O port and the A port are not communicated, the first motor pump and the second motor pump are of the same type, a hydraulic oil inlet of the first motor pump is connected with the O port, a hydraulic oil outlet of the first motor pump is connected with a hydraulic oil inlet of the second motor pump, a hydraulic oil outlet of the second motor pump is connected with an oil tank of the hydraulic height adjusting system, a gear oil inlet and a gear oil outlet of the first motor pump are connected with the rocker gear oil cavity and the traction gear oil cavity respectively, a gear oil inlet and a gear oil outlet of the second motor pump are connected with the traction gear oil cavity and the rocker gear oil cavity respectively, the P port is connected with the pressure oil source, the B port is connected with an oil inlet of a height adjusting cylinder of the hydraulic height adjusting system, and the A port is connected with the oil tank of the hydraulic height adjusting system; when the coal mining machine does not need to be adjusted in height, the main reversing valve is in the first working position, the pressure oil source supplies oil to the first motor pump and the second motor pump, and the first motor pump and the second motor pump continuously work, when the coal mining machine needs to be adjusted in height, the main reversing valve is in the second working position, the pressure oil source only supplies oil to the height adjusting cylinder, and the first motor pump and the second motor pump stop working; the output flow of the first motor pump and the second motor pump is detected respectively, when the coal mining machine does not need to be adjusted in height, if the first motor pump and the second motor pump have the output flow and the output flow of the first motor pump and the second motor pump is equal, it represents that the oil liquid bidirectional circulation self-cooling system of the coal mining machine is in a normal working state, and if the difference between the output flow of the first motor pump and the second motor pump exceeds a certain amount or is 0, it represents that the oil liquid bidirectional circulation self-cooling system of the coal mining machine has a fault.

2. The method for coal mining machine oil liquid two-way circulation self-cooling according to claim 1, characterized in that: An overflow valve is arranged between the hydraulic oil inlet of the first motor pump and the hydraulic oil outlet of the second motor pump, and an inlet of the overflow valve is communicated with the hydraulic oil inlet of the first motor pump.

3. The method for coal mining machine oil liquid two-way circulation self-cooling according to claim 2, characterized in that: The main reversing valve is a K-type three-position four-way reversing valve with a neutral position, when the main reversing valve is in the neutral position and a left position, a P port, an O port and a B port of the main reversing valve are communicated, an A port is not communicated, and when the main reversing valve is in a right position, the P port and the B port are communicated, the O port and the A port are not communicated.

4. A shearer oil two-way circulation self-cooling system, characterized in that: The method for realizing the oil liquid two-way circulation self-cooling of the coal mining machine according to any one of claims 1, 2 and 3 comprises a main reversing valve, a rocker arm high-temperature oil path, a rocker arm low-temperature oil path, a traction high-temperature oil path, a traction low-temperature oil path, a pump I and a pump II, the outlet of the rocker arm high-temperature oil path is connected with the inlet of the traction high-temperature oil path through the pump I, the inlet of the rocker arm high-temperature oil path and the outlet of the traction high-temperature oil path are communicated with a rocker arm gear oil cavity and a traction gear oil cavity respectively, the outlet of the traction low-temperature oil path is connected with the inlet of the rocker arm low-temperature oil path through the pump II, the inlet of the traction low-temperature oil path and the outlet of the rocker arm low-temperature oil path are communicated with the traction gear oil cavity and the rocker arm gear oil cavity respectively, the inlet of the rocker arm high-temperature oil path and the outlet of the rocker arm low-temperature oil path are arranged at different positions of the rocker arm gear oil cavity respectively, the outlet of the traction high-temperature oil path and the inlet of the traction low-temperature oil path are arranged at different positions of the traction gear oil cavity respectively, the P port, the O port and the B port of the main reversing valve are communicated when the main reversing valve is in the first working position, the A port is not communicated, the P port and the B port are communicated when the main reversing valve is in the second working position, the O port and the A port are not communicated, the pump I and the pump II are respectively a first motor pump and a second motor pump of the same type, the hydraulic oil inlet of the first motor pump is connected with the O port, the hydraulic oil outlet of the first motor pump is connected with the hydraulic oil inlet of the second motor pump, the hydraulic oil outlet of the second motor pump is connected with an oil tank of a hydraulic height adjusting system, the gear oil inlet and the gear oil outlet of the first motor pump are connected with the outlet of the rocker arm high-temperature oil path and the inlet of the traction high-temperature oil path respectively, the gear oil inlet and the gear oil outlet of the second motor pump are connected with the outlet of the traction low-temperature oil path and the inlet of the rocker arm low-temperature oil path respectively, the P port is connected with a pressure oil source of the hydraulic height adjusting system of the coal mining machine itself, the B port is connected with an oil inlet of a height adjusting cylinder of the hydraulic height adjusting system, the A port is connected with an oil tank of the hydraulic height adjusting system, and the first flow sensor and the second flow sensor are respectively arranged on the rocker arm low-temperature oil path and the traction high-temperature oil path.

5. The coal mining machine oil two-way circulation self-cooling system of claim 4, wherein: The first filter and the second filter are respectively arranged on the rocker arm high-temperature oil path and the traction low-temperature oil path.

6. The coal mining machine oil two-way circulation self-cooling system of claim 5, wherein: The rocker arm high-temperature oil path, the rocker arm low-temperature oil path, the traction high-temperature oil path and the traction low-temperature oil path all adopt oil pipes.

7. A coal cutter oil two-way circulation self-cooling system according to claim 4, 5 or 6, characterized in that: The main reversing valve adopts a K-type three-position four-way reversing valve with a neutral function, the P port, the O port and the B port of the main reversing valve are communicated when the main reversing valve is in the neutral position and the left position, the A port is not communicated, the P port and the B port are communicated when the main reversing valve is in the right position, and the O port and the A port are not communicated.

8. The coal mining machine oil two-way circulation self-cooling system of claim 7, wherein: The hydraulic oil inlet path, the hydraulic oil return path and the overflow valve are further included, the O port is connected with the hydraulic oil inlet of the first motor pump through the hydraulic oil inlet path, the hydraulic oil outlet of the second motor pump is connected with the oil tank of the hydraulic height adjusting system through the hydraulic oil return path, and the overflow valve is arranged between the hydraulic oil inlet of the first motor pump and the hydraulic oil outlet of the second motor pump, and the inlet of the overflow valve is communicated with the hydraulic oil inlet of the first motor pump.

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