Pressurizing device and hydraulic system for fully mechanized coal mining face

Abstract

The utility model provides a supercharging device and a hydraulic system used for a fully mechanized coal mining face, the supercharging device comprises a pressure reducing valve, a double-acting reciprocating supercharger, an energy accumulator and a safety valve, the double-acting reciprocating supercharger is provided with a device liquid inlet, a device liquid return port and a device liquid outlet, the reciprocating pressure cylinder comprises a reciprocating pressure cylinder body, a hydraulic control reversing valve used for pressurizing and a hydraulic control one-way valve used for releasing pressure, a movable piston is arranged in the reciprocating pressure cylinder body, and pressurizing or releasing pressure is achieved through movement of the piston in the reciprocating pressure cylinder body. According to the embodiment of the utility model, each hydraulic support on the fully mechanized coal mining face is supplemented with pressure at the position close to the working face through the supercharging device, a high-pressure booster pump does not need to be provided, so that a hydraulic system is simple, high in reliability and low in cost, and the hydraulic support can be continuously supplemented with pressure.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hydraulic control of fully mechanized working face, in particular to a kind of booster device and for the hydraulic system of fully mechanized working face. BACKGROUND

[0002] As the core equipment of fully mechanized working face, hydraulic support generates initial support force to coal roof, which is an important condition for safety production. The supply pressure of hydraulic pump station in coal mine is generally 31.5MPa. Due to the problems of pipeline loss along the way and emulsion leakage, the pressure in the lower cavity of the column decreases, causing insufficient initial support force of the hydraulic support. With the application of long-distance supply system and large-height hydraulic support, the problem of insufficient initial support force of the hydraulic support is particularly prominent, which seriously affects the safe operation of fully mechanized system.

[0003] At present, the above problem is generally solved by using high-pressure booster pump in the prior art. However, the installation position of the equipped high-pressure booster pump is far from the working face, which requires the entire hydraulic working face to be equipped with super-long pipeline accessories, making the entire hydraulic working face pipeline structure complex, high in cost and poor in reliability. In addition, the high-pressure booster pump can only be used as a pressure supplement source, and only acts in the case of column leakage, roof crushing and condition change, which is discontinuous and has a long idle time. In addition, the high-pressure oil source is usually generated by the original hydraulic components of mine hydraulic support, i.e. lifting jack, which cannot meet the requirements of continuous automatic pressure boosting and has low pressure supplement efficiency. UTILITY MODEL CONTENT

[0004] In order to solve the above problems existing in the prior art, the utility model embodiment provides a kind of booster device and for the hydraulic system of fully mechanized working face.

[0005] Therefore, the utility model embodiment provides a kind of booster device, comprising a pressure reducing valve and a double-acting reciprocating pressure booster, the double-acting reciprocating pressure booster has a device liquid inlet, a device liquid return and a device liquid outlet, which includes a reciprocating pressure cylinder, a hydraulic control reversing valve for pressure boosting and a hydraulic control check valve for pressure relief, a movable piston is arranged in the reciprocating pressure cylinder, and the piston moves in the reciprocating pressure cylinder to realize pressure boosting or pressure relief.

[0006] In some embodiments, the reciprocating supercharging cylinder comprises a main cylinder body, a first auxiliary cylinder body and a second auxiliary cylinder body are arranged on two sides of the main cylinder body respectively, the piston comprises a piston body, a first piston rod and a second piston rod are arranged on two sides of the piston body respectively, the piston body reciprocates in the main cylinder body and forms a first piston cavity and a second piston cavity with the main cylinder body; the first piston rod reciprocates in the first auxiliary cylinder body and forms a first supercharging cavity with the first auxiliary cylinder body, and the second piston rod reciprocates in the second auxiliary cylinder body and forms a second supercharging cavity with the second auxiliary cylinder body.

[0007] In some embodiments, the first piston cavity inlet and the second piston cavity inlet are symmetrically arranged on the main cylinder body, and the first piston cavity inlet and the second piston cavity inlet are connected with the device liquid inlet and the device liquid return through the liquid control reversing valve for supercharging.

[0008] In some embodiments, a first one-way valve is arranged between the device liquid inlet and the first piston cavity, and a second one-way valve is arranged between the device liquid inlet and the second piston cavity.

[0009] In some embodiments, a first supercharging cavity inlet and a first liquid outlet are arranged on the first auxiliary cylinder body, and a second supercharging cavity inlet and a second liquid outlet are correspondingly arranged on the second auxiliary cylinder body, the first supercharging cavity inlet and the second supercharging cavity inlet are connected with the device liquid inlet and the device liquid return, and the first liquid outlet and the second liquid outlet are connected with the device liquid outlet.

[0010] In some embodiments, a third one-way valve is arranged between the first supercharging cavity and the device liquid outlet, and a fourth one-way valve is arranged between the second supercharging cavity and the device liquid outlet.

[0011] In some embodiments, a first pilot control port is arranged on the first auxiliary cylinder body, and a second pilot control port is correspondingly arranged on the second auxiliary cylinder body, and the first pilot control port and the second pilot control port are connected with the liquid control reversing valve for supercharging.

[0012] In some embodiments, an accumulator and a safety valve are further included.

[0013] Embodiments of the utility model provide a hydraulic system for fully mechanized coal mining face, which comprises a hydraulic pump station, at least one hydraulic support and the supercharging device.

[0014] In some embodiments, when the pressure compensation operation is performed, the device liquid inlet is connected with the system liquid inlet of the hydraulic pump station, the device liquid return is connected with the system liquid return of the hydraulic pump station, and the device liquid outlet is connected with the hydraulic support through the hydraulic control reversing valve; when the pressure relief operation is performed, the device liquid inlet is connected with the system liquid return of the hydraulic pump station, the device liquid return is connected with the system liquid inlet of the hydraulic pump station, the hydraulic control one-way valve for pressure relief is controlled to connect the device liquid outlet with the system liquid return of the hydraulic pump station, and the pressure relief is realized through the device liquid outlet.

[0015] The embodiment of the utility model realizes the pressure compensation of each hydraulic support on the fully mechanized working face at the position near the working face through the pressure increasing device, does not need to provide the high pressure pressure increasing pump additionally, makes the hydraulic system simple, high in reliability and low in cost, can also have the function of continuous pressure compensation of the hydraulic support.

[0016] In order to make the above-mentioned purpose, features and advantages of the embodiment of the utility model more obvious and easy to understand, the following preferred embodiment is taken, and the detailed description is made as follows in cooperation with the attached drawings. DRAWINGS

[0017] In the drawings which are not necessarily drawn to scale, like reference numerals can describe similar parts throughout the various views. Like reference numerals with an alphabetical suffix or different alphabetical suffixes can denote different instances of similar parts. The drawings illustrate various embodiments by way of example and not by way of limitation in the description of the embodiments below, like reference numerals are used to refer to the same or like parts throughout and in all the drawings. Such embodiments are illustrative and not intended to be exhaustive or exclusive, being directed to the device or method. The drawings herein are used to provide a further understanding of the utility model, constitute a part of the application, the illustrative embodiment of the utility model and its description are used to explain the utility model, and do not constitute undue limitation on the utility model. In the drawings:

[0018] Figure 1 It is the arrangement schematic view of hydraulic system provided by an embodiment of the utility model;

[0019] Figure 2 It is the arrangement schematic view of hydraulic system provided by another embodiment of the utility model;

[0020] Figure 3 It is the arrangement schematic view of pressure increasing device in the hydraulic system provided by an embodiment of the utility model;

[0021] Figure 4 It is the structure schematic view of double-acting reciprocating pressure increaser in the pressure increasing device provided by an embodiment of the utility model;

[0022] Figure 5 is a step schematic view of a control method for a hydraulic support provided by an embodiment of the utility model;

[0023] Figure 6 is a flow schematic view of a control method for a hydraulic support provided by an embodiment of the utility model.

[0024] In the above-mentioned drawings, the following reference signs are included:

[0025] First embodiment: 10 - upper computer; 20 - pressure increasing device; 30 - hydraulic support; 40 - hydraulic control check valve;

[0026] Second embodiment: 101 - hydraulic pump station; 102 - pump station overflow valve; 103 - pressure increasing device; 1031 - pressure reducing valve; 1032 - double-acting reciprocating pressure booster; 1033 - accumulator; 1034 - safety valve; 104 - first electromagnetic directional valve; 105 - upper computer; 106 - second electromagnetic directional valve; 107 - first hydraulic control check valve; 108 - second hydraulic control check valve; 109 - third hydraulic control check valve; 110 - first upright column; 111 - second upright column;

[0027] Third embodiment: 1 - first check valve; 2 - third hydraulic control check valve; 3 - third check valve; 4 - first pressure increasing cavity; 5 - first piston cavity; 6 - reciprocating pressure cylinder; 61 - main cylinder body; 611 - first piston cavity liquid inlet; 612 - second piston cavity liquid inlet; 62 - first auxiliary cylinder body; 621 - first pilot control port; 622 - first pressure increasing cavity liquid inlet; 623 - first liquid outlet; 63 - second auxiliary cylinder body; 631 - second pilot control port; 632 - second pressure increasing cavity liquid inlet; 633 - second liquid outlet; 7 - piston; 71 - piston body; 72 - first piston rod; 73 - second piston rod; 8 - second piston cavity; 9 - second pressure increasing cavity; 10 - fourth check valve; 12 - second check valve; 13 - hydraulic control directional valve. DETAILED DESCRIPTION

[0028] In the following, specific embodiments of the utility model are described in detail in combination with the drawings, but not as the limitation of the utility model.

[0029] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the above description should not be regarded as limiting, but only as an example of the embodiments. Those skilled in the art will think of other modifications within the scope and spirit of the utility model.

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and, together with the general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0031] These and other characteristics of the present application will become apparent from the following description of the preferred forms thereof given, by way of non-limiting example, with reference to the attached drawings.

[0032] It is also to be understood that even though a number of embodiments of the present application have been described herein, the application covers all modifications and equivalents falling within the scope of the following claims.

[0033] The above and other aspects, features and advantages of the present application will become apparent from the following description in view of the accompanying drawings.

[0034] Specific embodiments of the present application are described hereinafter, with reference to the accompanying drawings; however, it will be understood that the disclosed embodiments are merely examples of the present application, which can be embodied in various forms. Well-known and / or redundant functions and structures are not described in detail to avoid obscuring the present application unnecessarily. Therefore, specific structural and functional details disclosed herein are not intended to limit the present application, but merely as a basis for the claims and a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriate detailed structure.

[0035] It should be noted that the terms "first", "second", and the like, used in the description and in the claims of the present application, are used to describe various similar objects and are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the use of these terms in some contexts can be interchanged with one another, e.g., a first object or step can be a second object or step, and a second object or step can be a first object or step, without departing from the teachings of the present application. Furthermore, the terms "comprise" and "have," and variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, product, or apparatus that comprises a list of steps or units is not necessarily limited to those steps or units, but can include other not expressly listed steps or units, without departing from the teachings of the present application.

[0036] The present specification can use the phrases "in an embodiment," "in another embodiment," "in yet another embodiment," or "in at least one embodiment," which can refer to one or more embodiments of the present application.

[0037] The first embodiment of the utility model provides a kind of for hydraulic system of fully mechanized coal mining face, it is for at least one hydraulic support on the fully mechanized coal mining face is carried out hydraulic control and pressure compensation operation, here especially can be sequentially arranged multiple hydraulic supports on the fully mechanized coal mining face.

[0038] As Figure 1 As shown in the utility model, the hydraulic system for fully mechanized coal mining face includes hydraulic pump station, electro-hydraulic control device, host computer 10, booster device 20 and at least one hydraulic support 30, the booster device 20 and the hydraulic support 30 are connected with the hydraulic pump station, the hydraulic pump station is used to output emulsion, the booster device 20 is used to pressurize the emulsion output by the hydraulic pump station to realize the pressure compensation operation to the hydraulic support 30, in addition, hydraulic control check valve 40 is arranged between the booster device 20 and the hydraulic support 30, and the hydraulic control check valve 40 is used to control the high-pressure emulsion generated by the booster device 20 to enter the corresponding hydraulic support 30.

[0039] Among them, the hydraulic pump station has system inlet P and system return T, the system inlet P is connected with the inlet end of the hydraulic support 30 and the inlet end of the booster device 20 through pipeline, and the return end of the hydraulic support 30 and the return end of the booster device 20 are connected with the system return T through pipeline.

[0040] In one embodiment, the booster device 20 is connected with multiple hydraulic supports 30 through pipeline, and multiple hydraulic supports 30 are arranged in parallel with each other, and the hydraulic control check valve 40 is arranged between the booster device 20 and each hydraulic support 30. In this embodiment, each hydraulic control check valve 40 is connected with the corresponding hydraulic support 30, so as to provide high-pressure emulsion pressurized by the booster device 20 to the corresponding hydraulic support 30 through the hydraulic control check valve 40, thereby realizing the pressure compensation operation to the hydraulic support 30.

[0041] Further, the host computer 10 is connected with the electro-hydraulic control device, and the electro-hydraulic control device is connected with at least the booster device 20, the hydraulic support 30 and the hydraulic control check valve 40 to control the booster device 20, the hydraulic support 30 and the hydraulic control check valve 40 respectively.

[0042] Further, the booster device 20 is preferably located at the proximal end position of the fully mechanized coal mining face, so that the booster device 20 and the electro-hydraulic control device are connected with the host computer 10, so that the emulsion pressurization operation can be realized by using the emulsion of the hydraulic pump station nearby without high-pressure booster pump in this embodiment.

[0043] The embodiment of the utility model through pressure increasing device realizes to each hydraulic support on fully mechanized coal mining face in the position of near working face pressure compensation, need not to provide high pressure pressure increasing pump additionally, make hydraulic system simple, reliability high and low in cost, still can have the function of continuous pressure compensation to hydraulic support.

[0044] The second embodiment of the utility model embodiment provides a kind of for the hydraulic system of fully mechanized coal mining face, as shown in Figure 2 As shown, the hydraulic system includes hydraulic pump station 101, pressure increasing device 103, first electromagnetic reversing valve 104, host computer 105, second electromagnetic reversing valve 106 and first hydraulic control check valve 107, wherein the hydraulic pump station 101 is connected with hydraulic support and the pressure increasing device 103 by pipeline respectively;The first electromagnetic reversing valve 104 is arranged between the hydraulic pump station 101 and the pressure increasing device 103, and the second electromagnetic reversing valve 106 is arranged between the hydraulic pump station 101 and the hydraulic support;Herein, the first electromagnetic reversing valve 104 is used to control the pressure increasing device 103, and the second electromagnetic reversing valve 106 is used to control the hydraulic support.The hydraulic pump station 101 in the embodiment has total inlet port P and total return port T.In the process of normal pressure compensation operation, the inlet end of the pressure increasing device 103 is communicated with the total inlet port P of the hydraulic pump station 101, and the return end of the pressure increasing device 3 is communicated with the total return port T of the hydraulic pump station 101.

[0045] Further, the pressure increasing device 103 is connected with the hydraulic support by pipeline, and the first hydraulic control check valve 107 is arranged between the pressure increasing device 103 and the hydraulic support.

[0046] In addition, pump station overflow valve 102 is further arranged on the outlet side of the hydraulic pump station 101 to avoid overflow of the hydraulic pump station 101.

[0047] The hydraulic system for fully mechanized coal mining face is used to realize liquid supply and pressure compensation operation for hydraulic support.In the embodiment, the hydraulic support includes first column 110 and second column 111, the first column 110 is connected with second hydraulic control check valve 108, the second column 111 is connected with third hydraulic control check valve 109, the second hydraulic control check valve 108 and the third hydraulic control check valve 109 are connected with the first hydraulic control check valve 107, and the first hydraulic control check valve 107 is used for pressure compensation operation for the first column 110 and the second column 111.

[0048] In addition, the second hydraulic control check valve 108 and the third hydraulic control check valve 109 are connected with a safety valve, a pressure gauge and a pressure sensor, the pressure sensor is arranged at any position where pressure needs to be detected, and the pressure data collected by the pressure sensor is transmitted to the upper computer 105 to control the operation of the pressure increasing device 103.

[0049] In the embodiment, the upper computer 105 controls the first electromagnetic reversing valve 104 to make the pressure increasing device 103 perform pressure increasing operation to convert the emulsion output by the hydraulic pump station 101 into high-pressure emulsion, and the high-pressure emulsion reaches the first hydraulic control check valve 107 through a pipeline and is stored in the blocking cavity of the first hydraulic control check valve 107 to prepare for pressure compensation of the columns of the hydraulic support, which can reduce the pressure compensation time and improve the work efficiency.

[0050] Further, when it is necessary to perform, for example, column lifting operation, the upper computer 105 controls the second electromagnetic reversing valve 106 to make the hydraulic support perform column lifting action, wherein when the hydraulic support contacts the coal seam roof, the pressure in the first column 110 and the second column 111 in the hydraulic support rises. At this time, when the pressure sensor detects that the supply pressure of the hydraulic support is 20 MPa, the supply pressure may, for example, be the pressure in the lower cavity of the column of the hydraulic support, and the upper computer 105 controls the second electromagnetic reversing valve 106 to perform pressure increasing action; in this way, by controlling the first hydraulic control check valve 107 to open, the high-pressure emulsion prepared in the first hydraulic control check valve 107 enters the lower cavities of the first column 110 and the second column 111 through the second hydraulic control check valve 108 and the third hydraulic control check valve 109 respectively to realize pressure compensation for the columns; when the pressure sensor detects that the supply pressure exceeds 35 MPa, the upper computer 105 controls the second electromagnetic reversing valve 106 to perform closing pressure increasing function to stop inputting high-pressure emulsion to the hydraulic support through the first hydraulic control check valve 107.

[0051] In addition, if the pressure increasing device 103 is directly closed, the upper computer 105 can directly control the second electromagnetic reversing valve 106 to perform pressure relief action, at this time, the liquid return end of the pressure increasing device 103 communicates with the total liquid inlet P of the hydraulic pump station 101, the liquid inlet end of the pressure increasing device 103 communicates with the total liquid return port T of the hydraulic pump station 101, and the pressure increasing device 103 can realize pressure relief function through the liquid outlet end. The pressure increasing device 103 described above can be used for pressure compensation and pressure relief operation at the same time, and is also applicable to the first embodiment described above.

[0052] The embodiment of the utility model discloses a pressure increasing device for supplementing pressure of each hydraulic support on the fully mechanized coal mining face, which does not need to provide a high-pressure pressure increasing pump additionally, so that the hydraulic system is simple, reliable and low in cost, and can continuously supplement pressure of the hydraulic support.

[0053] The third embodiment of the utility model provides a kind of pressure increasing device, and the pressure increasing device of the embodiment involves the hydraulic system suitable for the first embodiment or the second embodiment based on Figure 1 And Figure 2 As shown in combination Figure 3 And Figure 4 The pressure increasing device 103 includes pressure reducing valve 1031, double-acting reciprocating pressure booster 1032, energy accumulator 1033 and safety valve 1034; the pressure reducing valve 1031 can reduce the emulsion pressure with fluctuations output by the hydraulic pump station to a predetermined value, to ensure the inlet pressure of the double-acting hydraulic reciprocating pressure booster 1032 is stable; the double-acting reciprocating pressure booster 1032 can convert the emulsion of the hydraulic pump station into high-pressure emulsion; the double-acting reciprocating pressure booster 1032 has the advantages of compact structure and small size.

[0054] The energy accumulator 1033 can suppress the pressure fluctuation of the high-pressure emulsion input by the double-acting reciprocating pressure booster 1032 into the hydraulic support, and play the role of peak clipping and valley filling; the safety valve 1034 can protect the pipeline in the pressure increasing device 103, to prevent pressure from exceeding the limit and damaging the hydraulic support.

[0055] Further, the double-acting reciprocating pressure booster 1032 has device inlet IN, device return port R and device outlet H; the device inlet IN is connected to the system inlet P of the hydraulic pump station 101 through a pipeline, the device return port R is connected to the system return port T of the hydraulic pump station 101 through a pipeline, and the device outlet H is connected to the first hydraulic control check valve 107; the pressure reducing valve 1031 is arranged between the system inlet P and the device inlet IN.

[0056] The working principle of the pressure increasing device 103 in the hydraulic system is as follows: the emulsion delivered by the hydraulic pump station 101 passes through the pressure reducing valve 1031 and is reduced to a predetermined pressure, and then enters the double-acting hydraulic reciprocating pressure booster 1032 to generate high-pressure emulsion; the high-pressure emulsion enters the energy accumulator 1033 and the blocking cavity of the first hydraulic control check valve 107, to prepare for pressure supplement.

[0057] If the generated high-pressure emulsion exceeds the set pressure of the safety valve 1034, the safety valve 1034 opens to reduce the liquid supply pressure of the system. Due to the presence of the first hydraulic control check valve 107, the opening of the safety valve 1034 here does not affect the lower cavity pressure of the hydraulic support column, so that the entire hydraulic system can efficiently output stable high-pressure emulsion.

[0058] Further, the double-acting reciprocating booster 1032 comprises a reciprocating booster cylinder 6, a hydraulic control reversing valve 13, and a third hydraulic control check valve 2, wherein the reciprocating booster cylinder 6 is provided with a movable piston 7, and the hydraulic control reversing valve 13 here is a two-position four-way hydraulic control reversing valve.

[0059] Specifically, the reciprocating booster cylinder 6 comprises a main cylinder body 61, and a first auxiliary cylinder body 62 and a second auxiliary cylinder body 63 are arranged on both sides of the main cylinder body 61, respectively, and the main cylinder body 61 is in communication with the first cylinder body 62 and the second auxiliary cylinder body 63 on both sides, respectively. The piston 7 comprises a piston body 71, and a first piston rod 72 and a second piston rod 73 are arranged on both sides of the piston body 71, respectively, and the piston body 71 reciprocates in the main cylinder body 61, wherein the piston body 71 reciprocates in the main cylinder body 61 and forms a first piston cavity 5 and a second piston cavity 8 with the main cylinder body 61.

[0060] In addition, the first piston rod 72 reciprocates in the first auxiliary cylinder body 62 and forms a first booster cavity 4 with the first auxiliary cylinder body 62, and the second piston rod 73 reciprocates in the second auxiliary cylinder body 63 and forms a second booster cavity 9 with the second auxiliary cylinder body 63.

[0061] Further, the main cylinder body 61 is symmetrically provided with a first piston cavity inlet 611 and a second piston cavity inlet 612, the first auxiliary cylinder body 62 is provided with a first pilot control port 621, a first booster cavity inlet 622, and a first outlet 623, and the second auxiliary cylinder body 63 is correspondingly provided with a second pilot control port 631, a second booster cavity inlet 632, and a second outlet 633.

[0062] Wherein, the first piston cavity inlet 611 and the second piston cavity inlet 612 are connected with the device inlet IN and the device return port R through the hydraulic control reversing valve 13, the first booster cavity inlet 622 and the second booster cavity inlet 632 are connected with the device inlet IN and the device return port R, the first pilot control port 621 and the second pilot control port 631 are connected with the hydraulic control reversing valve 13, and the first outlet 623 and the second outlet 633 are connected with the device outlet H.

[0063] Further, a first one-way valve 1 is arranged between the device inlet IN and the first piston cavity 5, a second one-way valve 12 is arranged between the device inlet IN and the second piston cavity 8, a third one-way valve 3 is arranged between the first booster cavity 4 and the device outlet H, and a fourth one-way valve 10 is arranged between the second booster cavity 9 and the device outlet H.

[0064] The working principle of the double-acting reciprocating booster 1032 is as follows: when the device inlet IN of the booster device 103 is connected with the system inlet P of the hydraulic pump station 101, and the device return R of the booster device 103 is connected with the system return T of the hydraulic pump station 101, one way of the emulsion output by the hydraulic pump station 101 enters the first piston cavity 5 through the first piston cavity inlet 611 of the hydraulic control reversing valve 13, one way of the emulsion enters the first booster cavity 4 through the first one-way valve 1 from the first booster cavity inlet 622, and one way of the emulsion enters the second booster cavity 9 through the second one-way valve 12 from the second booster cavity inlet 632. Here, the device return R is connected with the second piston cavity 8 through the second piston cavity inlet 612 and the second piston cavity 8 by the hydraulic control reversing valve 13. At this time, due to the area difference between the piston body 71 and the piston rod, the emulsion of the hydraulic pump station 101 drives the piston 7 to move to the right, the volume of the second booster cavity 9 decreases, and the high-pressure emulsion formed thereby is output from the device outlet H through the fourth one-way valve 10 from the second outlet 633. Figure 4

[0065] As the piston 7 continues to move to the right, the first piston rod 72 passes through the first pilot control port 621, at which time the emulsion in the first booster cavity 4 enters the hydraulic control reversing valve 13 through the first pilot control port 621, so that the hydraulic control reversing valve 13 is reversed. At this time, the emulsion of the hydraulic pump station 101 enters the second piston cavity 8 through the second piston cavity inlet 612 of the hydraulic control reversing valve 13, the device return R is connected with the first piston cavity inlet 611, and the first piston cavity 5 is connected with the system return T. At this time, the piston 7 moves to the left, and the high-pressure emulsion formed in the first booster cavity 4 is output from the device outlet H through the third one-way valve 3 from the first outlet 623.

[0066] As the piston 7 continues to move to the left, the second piston rod 73 passes through the second pilot control port 631, at which time the emulsion in the second booster cavity 9 enters the hydraulic control reversing valve 13 through the second pilot control port 631, so that the hydraulic control reversing valve 13 is reversed. At this time, the emulsion of the hydraulic pump station 101 enters the first piston cavity 5 through the first piston cavity inlet 611 of the hydraulic control reversing valve 13, the device return R is connected with the second piston cavity inlet 612, and the second piston cavity 8 is connected with the system return T. At this time, the piston 7 moves to the right, and the high-pressure emulsion formed in the second booster cavity 9 is output from the device outlet H through the fourth one-way valve 10 from the second outlet 633. Figure 4 ​As the piston moves continuously to the left, the second piston rod 73 passes the second pilot control port 631. At this time, the emulsion in the second pressurization chamber 9 enters the hydraulic control reversing valve 13 through the second pilot control port 631, causing the fourth hydraulic control reversing valve 13 to reverse. Then the piston 7 continues to move to the right, and the above pressurization process is repeated.

[0067] In this embodiment, the high-pressure emulsion can be output through the reciprocating motion of the piston 7 within the piston cylinder 6, thereby improving the pressure replenishment efficiency.

[0068] In addition, the double-acting reciprocating booster 102 also has a pressure relief function. When the device inlet IN is connected to the system return port T of the hydraulic pump station 101, and the device return port R is connected to the system inlet P of the hydraulic pump station 101, the third hydraulic control check valve 2 opens in reverse, so that the device outlet H is connected to the system return port T of the hydraulic pump station 101, and pressure relief is achieved through the device outlet H.

[0069] This embodiment utilizes the pressure reducing valve, the accumulator, and the safety valve to stabilize the inlet pressure of the booster device, minimize pressure fluctuations in the output high-pressure emulsion, and provide self-protection. The use of a double-acting reciprocating booster allows for high-pressure emulsion output during the piston's reciprocating motion, improving pressure replenishment efficiency. Furthermore, it features a pressure relief function, enabling the booster device to independently relieve pressure, making the entire hydraulic system easier to operate.

[0070] This utility model embodiment uses a pressurization device to replenish the pressure of each hydraulic support on the fully mechanized mining face near the working face, eliminating the need for an additional high-pressure booster pump. This makes the hydraulic system simple, highly reliable, and low-cost, and also provides continuous pressure replenishment for the hydraulic supports.

[0071] The fourth embodiment of this utility model provides a control method for a hydraulic support, which is applicable to the hydraulic pump station of the first and second embodiments described above, such as... Figure 5 As shown, the control method can achieve pressure control of the emulsion in the lower cavity of the column based on the state of the hydraulic support, and includes:

[0072] S101, when the column of the hydraulic support is in the rising state and when the liquid supply pressure is greater than or equal to the first threshold, the pressurization device is activated to pressurize the emulsion.

[0073] S102, when the pressure in the lower chamber of the column of the hydraulic support is greater than or equal to the second threshold, the hydraulic control check valve for pressurization is opened to achieve a single pressurization.

[0074] S103, when the lower cavity pressure of the prop of the hydraulic support is boosted to be greater than or equal to a third threshold value, the hydraulic control check valve for boosting is controlled to be closed to stop pressure compensation.

[0075] In this embodiment, the boosting device is taken as an example of a single hydraulic support, and the control method for the hydraulic support is described. As shown in the figure, when the hydraulic pump station 101 starts to work, when the upper computer 105 detects that the liquid supply pressure of the hydraulic pump station 101 is greater than or equal to a first threshold value P1, the first threshold value here is equivalent to the starting pressure threshold value of the boosting device 103, the upper computer 105 controls the boosting device 103 to start the boosting function, so that the original hydraulic pump station delivers the emulsion to the fully-mechanized coal mining face for boosting to convert into high-pressure emulsion, and the high-pressure emulsion reaches the first hydraulic control check valve 107 through the pipeline, thereby preparing for the pressure compensation of the prop of the hydraulic support. Figure 6

[0076] On the one hand, when the prop of the hydraulic support is in the prop-raising state, when the lower cavity pressure of the prop continuously rises after the prop contacts the upper bottom plate, when the pressure sensor detects that the lower cavity pressure of the prop of the hydraulic support is greater than or equal to a second threshold value P2, the upper computer 105 controls the boosting electromagnetic valve of the hydraulic support to be opened and the hydraulic control check valve (for example, the first hydraulic control check valve 107) for boosting to be opened, at this time, the high-pressure emulsion enters the lower cavity of the prop of the hydraulic support, and the lower cavity pressure of the prop is increased; when it is detected that the lower cavity pressure of the prop is boosted to a third threshold value P3, the upper computer 105 controls the boosting electromagnetic valve of the hydraulic support to be closed, and the corresponding hydraulic control check valve is closed, thereby blocking the high-pressure emulsion from continuously entering the lower cavity of the prop, thereby completing the pressure compensation operation of the prop.

[0077] Further, the control method further comprises: in step S102, when the lower cavity pressure of the prop of the hydraulic support is greater than or equal to the second threshold value, the corresponding hydraulic control check valve of the hydraulic support is controlled to be opened to realize one-time pressure compensation, and when the lower cavity pressure of the prop is less than the third threshold value after a first predetermined time, the boosting device is controlled to be closed and the boosting device is started again after a second predetermined time to realize two-time pressure compensation.

[0078] Specifically, when the lower cavity of the prop is compensated for a first predetermined time t1, the lower cavity pressure of the prop still does not reach the third threshold value P3, the upper computer 105 controls the boosting function of the boosting device 103 to be closed and the boosting device 103 is started again after a second predetermined time t2, thereby performing two-time pressure compensation for the hydraulic support, and then when the lower cavity pressure of the prop reaches the third threshold value P3, the boosting function of the boosting device 103 is closed to complete the pressure compensation.

[0079] ​Further, the control method further comprises: after a third predetermined time in the secondary pressure compensation process, if the lower cavity pressure of the leg is less than the third threshold value, the control outputs an error flag.

[0080] Specifically, after a third predetermined time t3 in the secondary pressure compensation process, if the lower cavity pressure of the leg still does not reach the third threshold value P3, the upper computer 105 controls the electro-hydraulic control device to output an error flag.

[0081] Further, in another aspect, the control method further comprises: when the leg of the hydraulic support is in a supporting state and when the lower cavity pressure of the leg is less than a fourth threshold value, the control opens the corresponding hydraulic control check valve of the hydraulic support, so that the lower cavity pressure is raised to the third threshold value.

[0082] Specifically, when the leg of the hydraulic support 100 is in a supporting state, and when the lower cavity pressure of the leg detected by the pressure sensor is lower than the fourth threshold value P4, the upper computer 105 controls the pressure increasing electromagnetic valve of the hydraulic support to open, and the hydraulic control check valve (such as the first hydraulic control check valve 107) used for pressure increasing is opened, at this time, the high-pressure emulsion enters the lower cavity of the leg to raise the lower cavity pressure of the leg to the third threshold value P3.

[0083] Similarly, when the lower cavity pressure of the leg does not reach the third threshold value P3 after a first predetermined time t1 in the process of compensating the lower cavity of the leg, the upper computer 105 controls to close the pressure increasing function of the pressure increasing device 103 and to open the pressure increasing function of the pressure increasing device 103 again after waiting for a second predetermined time t2, thereby performing secondary pressure compensation for the hydraulic support, that is, when the lower cavity pressure of the leg reaches the third threshold value P3, the pressure increasing function of the pressure increasing device 103 is closed to complete the pressure compensation.

[0084] In addition, when the lower cavity pressure of the leg still does not reach the third threshold value P3 after a third predetermined time t3 in the secondary pressure compensation process, the upper computer 105 controls to output an error flag.

[0085] Further, the control method further comprises: when the hydraulic pump station stops supplying liquid and when the liquid supply pressure of the hydraulic pump station is lower than a fifth threshold value, the control starts the pressure relief function of the pressure increasing device.

[0086] Specifically, when the hydraulic pump station stops supplying liquid and when the hydraulic system pressure of the hydraulic pump station is lower than a fifth threshold value P5, the upper computer 105 controls the pressure increasing device 103 to start the pressure relief function, thereby completing the pressure relief of, for example, the inside of the pressure increasing device 103 and between the pressure increasing device 103 and the first hydraulic control check valve 107.

[0087] The embodiment of the utility model realizes the pressure compensation of each hydraulic support on the fully mechanized coal mining face at the position near the working face through the pressure increasing device, does not need to provide the high pressure pressure increasing pump additionally, makes the hydraulic system simple, high reliability and low cost, can also have the function of continuous pressure compensation of the hydraulic support.

[0088] In the above embodiments of the utility model, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0089] For the convenience of description, spatial relative terms such as "above", "upper", "on", "top", etc. can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned 90 degrees or in other orientations in other different ways, and the spatial relative description used herein is interpreted accordingly.

[0090] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in the specification refer to the specific features, structures or characteristics described in conjunction with the embodiment, which are included in at least one embodiment described in the general description of the application. The same description appears in several places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the implementation of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the utility model.

[0091] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0092] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A booster device, characterized in that, The device includes a pressure reducing valve and a double-acting reciprocating booster. The double-acting reciprocating booster has a device inlet, a device return port, and a device outlet. It includes a reciprocating booster cylinder, a hydraulically controlled directional valve for boosting pressure, and a hydraulically controlled check valve for depressurizing. A movable piston is provided inside the reciprocating booster cylinder. The movement of the piston within the reciprocating booster cylinder is used to achieve boosting or depressurizing.

2. The booster device according to claim 1, characterized in that, The reciprocating booster cylinder includes a main cylinder body, with a first auxiliary cylinder body and a second auxiliary cylinder body respectively disposed on both sides of the main cylinder body. The piston includes a piston body, with a first piston rod and a second piston rod respectively disposed on both sides of the piston body. The piston body reciprocates within the main cylinder body and forms a first piston chamber and a second piston chamber with the main cylinder body. The first piston rod reciprocates within the first auxiliary cylinder body and forms a first booster chamber with the first auxiliary cylinder body. The second piston rod reciprocates within the second auxiliary cylinder body and forms a second booster chamber with the second auxiliary cylinder body.

3. The booster device according to claim 2, characterized in that, The main cylinder is symmetrically provided with a first piston chamber inlet and a second piston chamber inlet. The first piston chamber inlet and the second piston chamber inlet are connected to the device inlet and the device return port through the hydraulic control directional valve for pressurization.

4. The booster device according to claim 3, characterized in that, A first check valve is provided between the liquid inlet of the device and the first piston chamber, and a second check valve is provided between the liquid inlet of the device and the second piston chamber.

5. The booster device according to claim 3, characterized in that, The first auxiliary cylinder is provided with a first pressurization chamber inlet and a first outlet, and the second auxiliary cylinder is provided with a second pressurization chamber inlet and a second outlet. The first pressurization chamber inlet and the second pressurization chamber inlet are connected to the device inlet and the device return liquid inlet, and the first outlet and the second outlet are connected to the device outlet.

6. The booster device according to claim 5, characterized in that, A third check valve is provided between the first pressurization chamber and the liquid outlet of the device, and a fourth check valve is provided between the second pressurization chamber and the liquid outlet of the device.

7. The booster device according to claim 5, characterized in that, A first pilot control port is provided on the first auxiliary cylinder body, and a second pilot control port is provided on the second auxiliary cylinder body accordingly. The first pilot control port and the second pilot control port are connected to the hydraulic control directional valve for pressurization.

8. The booster device according to claim 1, characterized in that, It also includes accumulators and safety valves.

9. A hydraulic system for a fully mechanized mining face, characterized in that, It includes a hydraulic pump station, at least one hydraulic support, and a booster device as described in any one of claims 1-8.

10. The hydraulic system for a fully mechanized mining face according to claim 9, characterized in that, When performing a pressure replenishment operation, the device's inlet is connected to the system inlet of the hydraulic pump station, the device's return port is connected to the system return port of the hydraulic pump station, and the device's outlet is connected to the hydraulic support via a hydraulically controlled directional valve. When performing a pressure relief operation, the device's inlet is connected to the system return port of the hydraulic pump station, and the device's return port is connected to the system inlet of the hydraulic pump station. The hydraulically controlled check valve for pressure relief is controlled to connect the device's outlet to the system return port of the hydraulic pump station, and pressure relief is achieved through the device's outlet.

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