Hydraulic support liquid return system

Abstract

The utility model discloses a hydraulic support liquid return system which comprises a working face main liquid return pipeline and a liquid supply system liquid return box. An electromagnetic directional valve, a liquid return buffer tank and a multi-way block are arranged between the working face main liquid return pipeline and the liquid supply system liquid return tank; the multi-way block is provided with a main interface and a plurality of branch interfaces, and the plurality of branch interfaces are arranged independently and are communicated with the main interface; a main inlet of the electromagnetic reversing valve is communicated with a main working face main liquid return pipeline, a first reversing port of the electromagnetic reversing valve is communicated with a liquid inlet of the liquid return buffer tank through a reversing valve main path liquid return pipeline, and a second reversing port of the electromagnetic reversing valve is communicated with a branch port of the multi-way block through a reversing valve bypass liquid return pipeline. A liquid outlet of the liquid return buffer tank is communicated with a branch port of the multi-way block through a connecting pipeline, and a liquid return booster pump is arranged on the connecting pipeline; and the main interface of the multi-way block is communicated with a liquid return box of the liquid supply system through a remote liquid return pipeline.

Description

Technical Field

[0001] The utility model relates to the field of coal mine support, in particular to a hydraulic support liquid return system. Background Art

[0002] In coal mines with intelligent fully mechanized mining faces, hydraulic supports are the core support equipment for fully mechanized mining faces. They ensure operational safety and provide a safe and efficient working environment for workers and other mining equipment. The primary working medium for hydraulic supports currently used in China is emulsion. The emulsion is supplied to the hydraulic supports on the working face by a remote intelligent fluid supply pump station. This emulsion is then transported back to the return tank of the intelligent fluid supply station via the working face return line, enabling the recycling of the emulsion.

[0003] Some liquid supply pump stations are located at a higher geographical location than the comprehensive mining working face. The return liquid of the hydraulic support of the comprehensive mining working face cannot naturally flow back to the return liquid tank of the liquid supply pump station, or the liquid supply pump station is too far away from the working face, and the diameter of the return liquid pipeline is limited, and the return liquid volume of the working face is too large. These problems will cause a large back pressure of the return liquid of the hydraulic support of the working face, resulting in slow movement of the hydraulic support or even inability of the hydraulic support to operate.

[0004] Patent No. CN202110930659.7 discloses a backpressure-free liquid return system and a large-flow plunger pump, which directly connects the pipeline pump in series to the main liquid return line in the tunnel, and uses the pipeline pump to pump the emulsion in the liquid return line into the liquid return tank; however, this structural design has two defects: first, the liquid return from the working face is intermittent. If the pipeline pump is always on, the equipment will idle when the main circuit pipeline is short of liquid, resulting in low equipment utilization; if a pump operator is responsible for controlling the pump, labor costs will increase, and the pump cannot be turned on and off in time, and the back pressure of the main liquid return line cannot be reduced to a minimum, affecting the efficiency of the coal mining machine on the working face; second, the number of hydraulic supports used on different working faces and the size of the oil cylinders vary. If the emulsion return flow rate of the working face is too large, the pipeline pump cannot be connected in series to the main liquid return line. The pipeline pump cannot be pumped back to the liquid return tank in a timely and effective manner, resulting in an increase in the back pressure in the main liquid return line for a certain period of time; therefore, it is necessary to study a hydraulic support liquid return system to solve the above problems. Summary of the Invention

[0005] The utility model aims to solve the above problems and provide a hydraulic support liquid return system which has a simple structure and reduces the back pressure of the hydraulic support liquid return.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] The camshaft of described hydraulic support is connected with the camshaft of described hydraulic support, and the camshaft of described hydraulic support is connected with the camshaft of described hydraulic support.

[0008] Furthermore, the connecting pipeline includes a first connecting pipeline and a second connecting pipeline; the return liquid booster pump includes a first return liquid booster pump and a second return liquid booster pump; one end of the first connecting pipeline and the second connecting pipeline are both connected to the liquid outlet of the return liquid buffer tank, the other end of the first connecting pipeline is connected to the branch interface of the multi-pass block via the first return liquid booster pump, and the other end of the second connecting pipeline is connected to the branch interface of the multi-pass block via the second return liquid booster pump.

[0009] Furthermore, the hydraulic support liquid return system also includes a liquid return boost control substation; the liquid return boost control substation is connected to the control end lines of the first liquid return boost pump, the second liquid return boost pump, and the electromagnetic reversing valve, and controls the starting status of the first liquid return boost pump, the second liquid return boost pump, and the direction conversion status of the electromagnetic reversing valve.

[0010] Furthermore, a return liquid pressure sensor for monitoring the liquid pressure in the main return liquid pipeline of the main working surface is provided on the inner wall of the main inlet of the electromagnetic reversing valve, and the return liquid pressure sensor is connected to the signal input end circuit of the return liquid boost control substation.

[0011] Furthermore, a liquid level sensor is provided in the return liquid buffer tank, and a low limit value and a high limit value are provided on the liquid level sensor; the liquid level sensor is connected to the signal input end circuit of the return liquid boost control substation.

[0012] Furthermore, the first liquid return booster pump and the second liquid return booster pump are both provided with oil temperature and oil pressure sensors and oil level sensors for monitoring the oil conditions in the liquid return booster pumps; the oil temperature and oil pressure sensors and oil level sensors are connected to the signal input end circuit of the liquid return booster control substation.

[0013] Furthermore, a total outlet pressure sensor for monitoring the liquid pressure in the remote liquid return pipeline is provided on the inner wall of the main interface of the multi-pass block, and the total outlet pressure sensor is connected to the signal input end circuit of the liquid return boost control substation.

[0014] Furthermore, the liquid return pressure boosting control substation is provided with an alarm for giving an alarm, and the alarm is connected to the liquid return pressure boosting control substation circuit.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are:

[0016] The utility model is designed to arrange an electromagnetic reversing valve and a liquid return buffer tank between the main return liquid pipeline of the working surface and the return liquid tank of the liquid supply system. When the hydraulic support performs a liquid return operation, the return liquid of the working surface passes through the main return liquid pipeline and the electromagnetic reversing valve directly into the liquid return buffer tank for buffering, so that the liquid pressure in the main return liquid pipeline of the working surface is kept normal. When there is a lot of emulsion in the liquid return buffer tank, it is pumped into the liquid return tank of the liquid supply system through the liquid return booster pump; if the return liquid flow of the working surface surges in a short time, the booster pump cannot pump the emulsion in the liquid return buffer tank back to the return liquid tank of the liquid supply system in time. At this time, the liquid level in the liquid return buffer tank is too high, which may cause the liquid in the main return liquid pipeline to When the pressure increases, the emulsion will flow directly into the return tank of the liquid supply system through the return liquid pipeline bypassing the reversing valve; when the booster pump continues to work, the liquid level in the return liquid buffer tank will drop rapidly to the normal working level, and the main return liquid pipeline of the reversing valve will be controlled to flow the emulsion into the return liquid buffer tank for buffering, avoiding the situation where the instantaneous return liquid flow of the working face surges, resulting in the return liquid booster pump being unable to pump out the emulsion in the return liquid buffer tank in time, effectively reducing the back pressure of the return liquid pipeline of the working face and making it consistent with the atmospheric pressure, avoiding the situation where the hydraulic support moves slowly or cannot operate due to excessive back pressure in the return liquid pipeline, and improving the use effect of the hydraulic support.

[0017] On the other hand, the liquid return booster pump in the utility model can be started and stopped according to the liquid level height in the liquid return buffer tank, thereby avoiding the situation where the liquid return booster pump runs idle for a long time and the liquid return booster pump is frequently started and stopped, thereby shortening the service life of the liquid return booster pump; at the same time, it does not require manual control of the liquid return booster pump, thus reducing labor costs, improving the response rate of the liquid return booster pump, and further improving the use effect of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 This is the system logic diagram of the utility model;

[0020] Figure 2 This is a workflow diagram of the present utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts, any modifications, equivalent replacements, improvements, etc., shall be included in the scope of protection of the present invention.

[0022] like Figure 1 As shown, this embodiment discloses a hydraulic support liquid return system, including a working surface main liquid return pipeline, which is connected to the liquid return tank of the liquid supply system; an electromagnetic reversing valve, a liquid return buffer tank, and a multi-channel block are arranged between the main liquid return pipeline of the working surface and the liquid return tank of the liquid supply system; the multi-channel block is provided with a main interface and a plurality of branch interfaces, and the plurality of branch interfaces are independently arranged and the plurality of branch interfaces are connected to the main interface; the main inlet of the electromagnetic reversing valve is connected to the main liquid return pipeline of the main working surface, the first reversing port of the electromagnetic reversing valve is connected to the liquid inlet of the liquid return buffer tank through the main return pipeline of the reversing valve, the second reversing port of the electromagnetic reversing valve is connected to the branch interface of the multi-channel block through the bypass return pipeline of the reversing valve, the liquid outlet of the liquid return buffer tank is connected to the branch interface of the multi-channel block through a connecting pipeline, and a liquid return booster pump is arranged on the connecting pipeline; the main interface of the multi-channel block is connected to the liquid return tank of the liquid supply system through a remote return pipeline.

[0023] The connecting pipeline includes a first connecting pipeline and a second connecting pipeline; the return liquid booster pump includes a first return liquid booster pump and a second return liquid booster pump; one end of the first connecting pipeline and the second connecting pipeline are both connected to the liquid outlet of the return liquid buffer tank, the other end of the first connecting pipeline is connected to the branch interface of the multi-pass block via the first return liquid booster pump, and the other end of the second connecting pipeline is connected to the branch interface of the multi-pass block via the second return liquid booster pump.

[0024] Through the design of two connecting pipelines and two liquid return booster pumps, the two liquid return booster pumps can work alternately to extend the service life of the liquid return booster pumps.

[0025] The hydraulic support liquid return system also includes a liquid return boost control substation; the liquid return boost control substation is connected to the control end lines of the first liquid return boost pump, the second liquid return boost pump, and the electromagnetic reversing valve, and controls the starting status of the first liquid return boost pump, the second liquid return boost pump, and the direction conversion status of the electromagnetic reversing valve.

[0026] A return liquid pressure sensor for monitoring the liquid pressure in the main return liquid pipeline of the main working surface is provided on the inner wall of the main inlet of the electromagnetic reversing valve. The return liquid pressure sensor is connected to the signal input end circuit of the return liquid boost control substation.

[0027] A liquid level sensor is provided in the return liquid buffer tank, and a low limit value and a high limit value are provided on the liquid level sensor; the liquid level sensor is connected to the signal input end circuit of the return liquid boost control substation.

[0028] The first liquid return booster pump and the second liquid return booster pump are both provided with oil temperature and pressure sensors and oil level sensors for monitoring the oil conditions in the liquid return booster pumps; the oil temperature and pressure sensors and oil level sensors are connected to the signal input end circuit of the liquid return booster control substation.

[0029] The oil temperature and pressure sensors and oil level sensors can automatically monitor and upload oil temperature, oil level and oil pressure data in real time, enabling the return liquid booster control substation to automatically monitor the lubricating oil pressure, oil temperature and oil level of the return liquid booster pump, thereby realizing the return liquid booster pump fault diagnosis and early warning functions.

[0030] A total outlet pressure sensor for monitoring the liquid pressure in the remote liquid return pipeline is provided on the inner wall of the main interface of the multi-pass block. The total outlet pressure sensor is connected to the signal input end line of the liquid return boost control substation.

[0031] The return liquid boost control substation is provided with an alarm for alarming, and the alarm is connected to the return liquid boost control substation circuit; the alarm information is simultaneously alarmed in two ways: the device interface alarm bar and the device alarm light.

[0032] The liquid return boost control substation can monitor the liquid pressure in the main liquid return pipeline of the main working surface, the liquid level in the liquid return buffer tank, the working status of the first liquid return boost pump and the second liquid return boost pump, and the liquid pressure in the remote liquid return pipeline. Based on the above information, it can control the starting status of the first liquid return boost pump and the second liquid return boost pump and the switching status of the electromagnetic reversing valve. The specific control process is as follows: Figure 2 As shown;

[0033] When the liquid pressure in the main return liquid pipeline of the main working surface is too high, the emulsion is allowed to enter the return liquid buffer tank. When the liquid level in the return liquid buffer tank reaches the high limit value, the return liquid booster control substation controls the first return liquid booster pump and the second return liquid booster pump to work alternately and pump the emulsion in the return liquid buffer tank to the return liquid tank of the liquid supply system; when the liquid level in the return liquid buffer tank reaches the low limit value, the return liquid booster control substation controls the first return liquid booster pump or the second return liquid booster pump to stop working;

[0034] When the first liquid return booster pump and the second liquid return booster pump fail and the liquid level in the liquid return buffer tank remains above the high limit value for a long time, the liquid return booster control substation controls the alarm to operate the alarm.

[0035] At the same time, the return liquid boost control substation controls the electromagnetic reversing valve to reverse, so that the liquid in the main return liquid pipeline of the main working surface enters the return liquid tank of the liquid supply system through the reversing valve bypass return liquid pipeline.

[0036] At the same time, in this technical solution, the starting state control of the first return liquid booster pump and the second return liquid booster pump and the switching state control of the electromagnetic reversing valve can be manually operated, avoiding the situation where the liquid in the main return liquid pipeline of the main working surface cannot be discharged in time when a failure occurs in the return liquid booster control substation, further improving the use effect of the utility model.

[0037] The utility model is designed to arrange an electromagnetic reversing valve and a liquid return buffer tank between the main return liquid pipeline of the working surface and the return liquid tank of the liquid supply system. When the hydraulic support performs a liquid return operation, the return liquid of the working surface passes through the main return liquid pipeline and the electromagnetic reversing valve directly into the liquid return buffer tank for buffering, so that the liquid pressure in the main return liquid pipeline of the working surface is kept normal. When there is a lot of emulsion in the liquid return buffer tank, it is pumped into the liquid return tank of the liquid supply system through the liquid return booster pump; if the return liquid flow of the working surface surges in a short time, the booster pump cannot pump the emulsion in the liquid return buffer tank back to the return liquid tank of the liquid supply system in time. At this time, the liquid level in the liquid return buffer tank is too high, which may cause the liquid in the main return liquid pipeline to When the pressure increases, the emulsion will flow directly into the return tank of the liquid supply system through the return liquid pipeline bypassing the reversing valve; when the booster pump continues to work, the liquid level in the return liquid buffer tank will drop rapidly to the normal working level, and the main return liquid pipeline of the reversing valve will be controlled to flow the emulsion into the return liquid buffer tank for buffering, avoiding the situation where the instantaneous return liquid flow of the working face surges, resulting in the return liquid booster pump being unable to pump out the emulsion in the return liquid buffer tank in time, effectively reducing the back pressure of the return liquid pipeline of the working face and making it consistent with the atmospheric pressure, avoiding the situation where the hydraulic support moves slowly or cannot operate due to excessive back pressure in the return liquid pipeline, and improving the use effect of the hydraulic support.

[0038] On the other hand, the liquid return booster pump in the utility model can be started and stopped according to the liquid level height in the liquid return buffer tank, thereby avoiding the situation where the liquid return booster pump runs idle for a long time and the liquid return booster pump is frequently started and stopped, thereby shortening the service life of the liquid return booster pump; at the same time, it does not require manual control of the liquid return booster pump, thus reducing labor costs, improving the response rate of the liquid return booster pump, and further improving the use effect of the utility model.

Claims

1. A hydraulic support liquid return system, comprising a working surface main liquid return pipeline, the working surface main liquid return pipeline being connected to a liquid return tank of a liquid supply system; characterized in that: An electromagnetic reversing valve, a return liquid buffer tank, and a multi-channel block are arranged between the main return liquid pipeline of the working surface and the return liquid tank of the liquid supply system; the multi-channel block is provided with a main interface and several branch interfaces, and the several branch interfaces are independently arranged and the several branch interfaces are connected to the main interface; the main inlet of the electromagnetic reversing valve is connected to the main return liquid pipeline of the main working surface, the first reversing port of the electromagnetic reversing valve is connected to the liquid inlet of the return liquid buffer tank through the main return liquid pipeline of the reversing valve, the second reversing port of the electromagnetic reversing valve is connected to the branch interface of the multi-channel block through the bypass return liquid pipeline of the reversing valve, the liquid outlet of the return liquid buffer tank is connected to the branch interface of the multi-channel block through a connecting pipeline, and a return liquid booster pump is arranged on the connecting pipeline; the main interface of the multi-channel block is connected to the return liquid tank of the liquid supply system through a remote return liquid pipeline.

2. The hydraulic support liquid return system according to claim 1, characterized in that: The connecting pipeline includes a first connecting pipeline and a second connecting pipeline; the return liquid booster pump includes a first return liquid booster pump and a second return liquid booster pump; one end of the first connecting pipeline and the second connecting pipeline are both connected to the liquid outlet of the return liquid buffer tank, the other end of the first connecting pipeline is connected to the branch interface of the multi-pass block via the first return liquid booster pump, and the other end of the second connecting pipeline is connected to the branch interface of the multi-pass block via the second return liquid booster pump.

3. The hydraulic support liquid return system according to claim 2, characterized in that: The hydraulic support liquid return system also includes a liquid return boost control substation; the liquid return boost control substation is connected to the control end lines of the first liquid return boost pump, the second liquid return boost pump, and the electromagnetic reversing valve, and controls the starting status of the first liquid return boost pump, the second liquid return boost pump, and the direction conversion status of the electromagnetic reversing valve.

4. The hydraulic support liquid return system according to claim 3, characterized in that: A return liquid pressure sensor for monitoring the liquid pressure in the main return liquid pipeline of the main working surface is provided on the inner wall of the main inlet of the electromagnetic reversing valve. The return liquid pressure sensor is connected to the signal input end circuit of the return liquid boost control substation.

5. The hydraulic support liquid return system according to claim 4, characterized in that: A liquid level sensor is provided in the return liquid buffer tank, and a low limit value and a high limit value are provided on the liquid level sensor; the liquid level sensor is connected to the signal input end circuit of the return liquid boost control substation.

6. The hydraulic support liquid return system according to claim 5, characterized in that: The first liquid return booster pump and the second liquid return booster pump are both provided with oil temperature and pressure sensors and oil level sensors for monitoring the oil conditions in the liquid return booster pumps; the oil temperature and pressure sensors and oil level sensors are connected to the signal input end circuit of the liquid return booster control substation.

7. The hydraulic support liquid return system according to claim 6, characterized in that: A total outlet pressure sensor for monitoring the liquid pressure in the remote liquid return pipeline is provided on the inner wall of the main interface of the multi-pass block. The total outlet pressure sensor is connected to the signal input end line of the liquid return boost control substation.

8. The hydraulic support liquid return system according to claim 7, characterized in that: The liquid return pressure boosting control substation is provided with an alarm for giving an alarm, and the alarm is connected to the liquid return pressure boosting control substation circuit.

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