A two-stage automatic liquid return device for a hydraulic pump station

Abstract

A hydraulic pump station two-stage automatic liquid return device, including liquid tank, the liquid tank pipeline connection underground fully mechanized oil return pipeline, the liquid tank is provided with oil return pump, the oil return pump pipeline connection fully mechanized pump station setting;The oil return pump is electrically connected with control switch, the control switch is self-resetting normally closed pull wire switch, a heavy ball is arranged at the tail end of the pull wire of the control switch, and the heavy ball is connected with a floating ball through a traction rope.The utility model solves the problem of difficulty in oil return in the prior art, especially for special working conditions such as the upward mining face, and has the advantages of simple equipment structure, reliable operation, low maintenance rate and high safety promotion value.

Description

Technical Field

[0001] This utility model relates to the field of general electromechanical equipment, and in particular to a two-stage automatic return fluid device for a hydraulic pump station. Background Technology

[0002] Currently, in coal mine production, underground geological conditions are complex and variable, and frequent crossings of fault zones, folds, and other geological structures are common occurrences. Especially when implementing overhead mining techniques and when the working face has a steep slope, the hydraulic support system faces significant challenges in its fluid return process.

[0003] Due to the influence of gravity and inclination angle, the resistance to fluid return increases, easily leading to poor fluid return and insufficient system pressure, which in turn affects support stability and mining efficiency. To address this issue, the common practice is to add a secondary fluid return tank combined with manually operated booster pumps for auxiliary fluid return. While this method can alleviate the fluid return difficulties to some extent, it still heavily relies on on-site monitoring and manual intervention, which not only increases the labor intensity and operational risks for workers but also wastes human resources and equipment operating costs. Furthermore, it suffers from problems such as response lag and low control precision.

[0004] There is currently no corresponding solution to the above problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a simple structure, suitable for various hydraulic pump station working conditions with difficult fluid return, capable of automatic fluid return, and especially safe and reliable operation of a two-stage automatic fluid return device for hydraulic pump stations.

[0006] The equipment includes a liquid tank, and the liquid tank pipeline is connected to the downhole fully mechanized oil return pipeline; that is, during use, the liquid tank is arranged at the slope change point as a secondary oil return tank, which plays an intermediate storage role. The liquid tank is equipped with a return oil pump, and the return oil pump pipeline is connected to the fully mechanized mining pump station; that is to say, the liquid tank serves as a return oil transfer station, and the return oil pump inside it pumps the temporarily stored redundant oil into the hydraulic pump station of the fully mechanized mining face under secondary pressurization. The return oil pump is electrically connected to a control switch, which is a self-resetting normally closed pull-coil switch. A weight ball is provided at the end of the pull-coil of the control switch, and the weight ball is connected to a float ball via a traction rope.

[0007] The effect achieved in this way is that, based on the control of the weight ball, the control switch is in the normally closed state, that is, before the return oil reaches a certain level, the return oil pump in the tank does not operate; after returning to a certain height, the float ball rises and drives the weight ball to rise, and the control switch forms a path for return oil until the control switch is disconnected again. The beneficial effects of this invention are: it solves the problem of difficult oil return in fully mechanized mining faces in the prior art, and is especially suitable for use in special working conditions such as overhead mining faces. Furthermore, the equipment has a simple structure, reliable operation, low maintenance rate, and is of great value for safe promotion. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of a two-stage automatic return fluid device for a hydraulic pump station according to the present invention; Figure label: 1-Control switch 2-Weight ball 3-Float ball 4-Fluid tank 5-Traveling support 6-Return oil pump The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0009] Reference Figure 1 The present invention provides a secondary automatic return oil device for a hydraulic pump station, comprising a liquid tank 4, wherein the liquid tank 4 is connected to the fully mechanized oil return pipeline; that is, during use, the liquid tank 4 is positioned at the slope change point as a secondary return oil tank, thus serving as an intermediate storage unit. The liquid tank 4 is equipped with a return oil pump 6, which is connected to the fully mechanized mining pump station via pipeline; that is, the liquid tank 4 serves as a return oil transfer station, and the return oil pump 6 inside it pumps the temporarily stored redundant oil into the hydraulic pump station of the fully mechanized mining face under secondary pressure. The return oil pump 6 is electrically connected to the control switch 1. The control switch 1 is a self-resetting normally closed pull-wire switch. A weight ball 2 is provided at the end of the pull wire of the control switch 1. The weight ball 2 is connected to the float ball 3 through a traction rope.

[0010] The effect achieved in this way is that, based on the control of the weight ball 2, the control switch 1 is in the normally closed state, that is, before the oil returns to a certain level, the oil return pump 6 in the liquid tank 4 does not operate; after returning to a certain height, the float ball 3 floats up and drives the weight ball 2 to float up, and the control switch 1 forms a passage for oil return until the control switch 1 is disconnected again. In particular, compared with various types of mechanical limit switches in the prior art, the self-resetting normally closed pull-wire switch adopted in this utility model is completely detached from the liquid tank 4, making its operation safer and more reliable. Moreover, the stroke control method of float 3 and weight ball 2 has a simpler mechanical structure, eliminating mechanical collisions, friction and interference. It is not afraid of rust, has a longer service life, and operates more stably.

[0011] Example 1: An oil pump support frame is provided on the bottom surface of the inside of the liquid tank 4. The oil pump support frame is a frame structure. The return oil pump 6 is fixedly mounted on the oil pump support frame.

[0012] This achieves the effect of preventing the return oil pump 6 from sinking to the bottom, making the assembly more secure.

[0013] In Example 2, a walking support 5 is also provided below the liquid tank 4. The bottom surface of the walking support 5 is provided with self-locking universal wheels, or it is equipped with walking wheels and used in conjunction with the vehicle-mounted braking mechanism.

[0014] The effect achieved in this way is that the equipment can be moved flexibly and can be used as a regular or temporary auxiliary device.

[0015] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0016] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A two-stage automatic return fluid device for a hydraulic pump station, comprising a fluid tank, wherein the fluid tank pipeline is connected to the downhole fully mechanized oil recovery pipeline, characterized in that: The liquid tank is equipped with a return oil pump, and the return oil pump pipeline is connected to the fully mechanized mining pump station. The return oil pump is electrically connected to a control switch, which is a self-resetting normally closed pull-coil switch. A weight ball is provided at the end of the pull-coil of the control switch, and the weight ball is connected to a float ball via a traction rope.

2. The hydraulic pump station secondary automatic return fluid device according to claim 1, characterized in that, The bottom surface inside the liquid tank is provided with an oil pump support frame, which is a frame structure. The return oil pump is fixedly mounted on the oil pump support frame.

3. The hydraulic pump station secondary automatic return fluid device according to claim 1, characterized in that, The liquid tank is also provided with a walking support, and the bottom surface of the walking support is provided with self-locking universal wheels, or is equipped with walking wheels and used in conjunction with the vehicle-mounted braking mechanism.

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