Pressurizing device and hydraulic system for fully mechanized coal mining face

Abstract

The embodiment of the invention provides a supercharging device and a hydraulic system 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 invention, 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 embodiments of the present disclosure relate to the technical field of hydraulic control of a fully mechanized mining face, and in particular, to a booster device and a hydraulic system for a fully mechanized mining face. Background Art

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

[0003] At present, the prior art generally solves the above problems by adopting a high-pressure booster pump. However, the installation position of the equipped high-pressure booster pump is far away from the working surface, which results in the entire hydraulic working surface being equipped with super-long pipeline accessories, making the entire hydraulic working surface pipeline structure complex, costly, and unreliable; in addition, the high-pressure booster pump can only be used as a pressure supplement source, and only works when the column leaks, the roof is broken, and the conditions change. It works non-continuously and has a long idle time. In addition, on the comprehensive mining working surface, the original hydraulic component of the mining hydraulic support - the bottom lifting jack is usually used to generate a high-pressure oil source, which cannot meet the requirements of continuous automatic pressurization and has low pressure supplement efficiency. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the embodiments of the present disclosure provide a boosting device and a hydraulic system for a fully mechanized mining working face.

[0005] In view of this, on the one hand, an embodiment of the present disclosure provides a boosting device, including a pressure reducing valve, a double-acting reciprocating supercharger, an accumulator and a safety valve, wherein the double-acting reciprocating supercharger has a device liquid inlet, a device liquid return port and a device liquid outlet, and includes a reciprocating boosting cylinder, a hydraulically controlled reversing valve for boosting and a hydraulically controlled one-way valve for pressure relief, and a movable piston is arranged in the reciprocating boosting cylinder, and pressure boosting or pressure relief is achieved by the movement of the piston in the reciprocating boosting cylinder.

[0006] In some embodiments, the reciprocating booster cylinder includes a main cylinder body, a first sub-cylinder body and a second sub-cylinder body are respectively arranged on both sides of the main cylinder body, the piston includes a piston body, a first piston rod and a second piston rod are respectively arranged on both sides of the piston body, the piston body reciprocates in the main cylinder body and forms a first piston chamber and a second piston chamber between the piston body and the main cylinder body; the first piston rod reciprocates in the first sub-cylinder body and forms a first booster chamber between the first sub-cylinder body, and the second piston rod reciprocates in the second sub-cylinder body and forms a second booster chamber between the second sub-cylinder body.

[0007] In some embodiments, a first piston chamber liquid inlet and a second piston chamber liquid inlet are symmetrically arranged on the main cylinder body, and the first piston chamber liquid inlet and the second piston chamber liquid inlet are connected to the device liquid inlet and the device liquid return port through the hydraulically controlled reversing valve for boosting pressure.

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

[0009] In some embodiments, a first boost chamber liquid inlet and a first liquid outlet are provided on the first sub-cylinder body, and a second boost chamber liquid inlet and a second liquid outlet are correspondingly provided on the second sub-cylinder body, the first boost chamber liquid inlet and the second boost chamber liquid inlet are connected to the device liquid inlet and the device return liquid, and the first liquid outlet and the second liquid outlet are connected to the device liquid outlet.

[0010] In some embodiments, a third one-way valve is disposed between the first pressurizing chamber and the liquid outlet of the device, and a fourth one-way valve is disposed between the second pressurizing chamber and the liquid outlet of the device.

[0011] In some embodiments, a first pilot control port is disposed on the first auxiliary cylinder body, and a second pilot control port is correspondingly disposed on the second auxiliary cylinder body, and the first pilot control port and the second pilot control port are connected to the hydraulically controlled reversing valve for pressurization.

[0012] On the one hand, an embodiment of the present disclosure provides a hydraulic system for a fully mechanized mining face, which includes a hydraulic pump station, at least one hydraulic support, and a booster device as described in any one of the above items.

[0013] In some embodiments, when performing a pressure replenishment operation, the device liquid inlet is connected to the system liquid inlet of the hydraulic pump station, the device liquid return port is connected to the system liquid return port of the hydraulic pump station, and the device liquid outlet is connected to the hydraulic support through a hydraulically controlled reversing valve.

[0014] In some embodiments, when the pressure relief operation is performed, when the device liquid inlet is connected to the system liquid return port of the hydraulic pump station, the device liquid return port is connected to the system liquid inlet of the hydraulic pump station, the hydraulically controlled one-way valve used for pressure relief is controlled to connect the device liquid outlet to the system liquid return port of the hydraulic pump station and pressure relief is achieved through the device liquid outlet.

[0015] The disclosed embodiment uses a boosting device to supplement the pressure of each hydraulic support on the comprehensive mining working face at a position near the working face, without the need for an additional high-pressure boosting pump, thereby making the hydraulic system simple, highly reliable and low-cost, and also having the function of continuously supplementing the pressure of the hydraulic supports.

[0016] In order to make the above-mentioned objectives, features and advantages of the embodiments of the present disclosure more obvious and understandable, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method. The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0018] Figure 1 is a schematic diagram of the layout of a hydraulic system provided by an embodiment of the present disclosure;

[0019] Figure 2 is a schematic diagram of the arrangement of a hydraulic system provided by another embodiment of the present disclosure;

[0020] Figure 3 is a schematic diagram of the arrangement of a pressure boosting device in a hydraulic system provided by an embodiment of the present disclosure;

[0021] Figure 4 is a structural schematic diagram of a double-acting reciprocating supercharger in a supercharging device provided in an embodiment of the present disclosure;

[0022] Figure 5 It is a schematic diagram of the steps of a control method for a hydraulic support provided by an embodiment of the present disclosure;

[0023] Figure 6It is a flow chart of a control method for a hydraulic support provided in one embodiment of the present disclosure.

[0024] The above drawings include the following reference numerals:

[0025] First embodiment: 10-host computer; 20-boosting device; 30-hydraulic support; 40-hydraulic control one-way valve;

[0026] Second embodiment: 101-hydraulic pump station; 102-pump station overflow valve; 103-boosting device; 1031-pressure reducing valve; 1032-double-acting reciprocating booster; 1033-accumulator; 1034-safety valve; 104-first electromagnetic reversing valve; 105-host computer; 106-second electromagnetic reversing valve; 107-first hydraulically controlled one-way valve; 108-second hydraulically controlled one-way valve; 109-third hydraulically controlled one-way valve; 110-first column; 111-second column;

[0027] Third embodiment: 1-first one-way valve; 2-third hydraulically controlled one-way valve; 3-third one-way valve; 4-first boosting chamber; 5-first piston chamber; 6-reciprocating boosting cylinder; 61-main cylinder body; 611-first piston chamber liquid inlet; 612-second piston chamber liquid inlet; 62-first sub-cylinder body; 621-first pilot control port; 622-first boosting chamber liquid inlet; 623-first liquid outlet; 63-second sub-cylinder body; 631-second pilot control port; 632-second boosting chamber liquid inlet; 633-second liquid outlet; 7-piston; 71-piston body; 72-first piston rod; 73-second piston rod; 8-second piston chamber; 9-second boosting chamber; 10-fourth one-way valve; 12-second one-way valve; 13-hydraulic controlled reversing valve. DETAILED DESCRIPTION

[0028] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, but are not intended to limit the present disclosure.

[0029] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

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

[0031] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0032] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0033] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0034] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0036] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0037] The first embodiment of the present disclosure provides a hydraulic system for a comprehensive mining working face, which is used to perform hydraulic control and pressure replenishment operations on at least one hydraulic support on the comprehensive mining working face. In particular, multiple hydraulic supports can be arranged in sequence on the comprehensive mining working face.

[0038] like Figure 1As shown, the hydraulic system for the comprehensive mining working face in this embodiment includes a hydraulic pump station, an electro-hydraulic control device, a host computer 10, a booster device 20 and at least one hydraulic support 30. The booster device 20 and the hydraulic support 30 are both connected to the hydraulic pump station. The hydraulic pump station is used to output emulsion. The booster device 20 is used to boost the emulsion output by the hydraulic pump station to achieve a pressure supplement operation on the hydraulic support 30. In addition, a hydraulically controlled one-way valve 40 is arranged between the booster device 20 and the hydraulic support 30. The hydraulically controlled one-way 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 a system liquid inlet P and a system liquid return port T. The system liquid inlet P is connected to the liquid inlet end of the hydraulic support 30 and the liquid inlet end of the boosting device 20 through a pipeline, and the liquid return end of the hydraulic support 30 and the liquid return end of the boosting device 20 are connected to the system liquid return port T through a pipeline.

[0040] In one embodiment, the boosting device 20 is connected to a plurality of the hydraulic supports 30 through pipelines, wherein the plurality of the hydraulic supports 30 are arranged in parallel with each other, and the hydraulically controlled one-way valve 40 is arranged between the boosting device 20 and each of the hydraulic supports 30. In this embodiment, each of the hydraulically controlled one-way valves 40 is connected to the corresponding hydraulic support 30, so that the high-pressure emulsion pressurized by the boosting device 20 is provided to the corresponding hydraulic support 30 through the hydraulically controlled one-way valve 40, thereby realizing the pressure replenishment operation of the hydraulic support 30.

[0041] Furthermore, the host computer 10 is connected to the electro-hydraulic control device, and the electro-hydraulic control device is connected to at least the boosting device 20, the hydraulic support 30 and the hydraulically controlled one-way valve 40 to control the boosting device 20, the hydraulic support 30 and the hydraulically controlled one-way valve 40 respectively.

[0042] Furthermore, the boosting device 20 here is preferably located at the proximal position of the comprehensive mining working face, so that it is convenient for the boosting device 20 and the electro-hydraulic control device to be connected to the host computer 10. In this way, in this embodiment, there is no need for a high-pressure boosting pump, and the emulsion of the hydraulic pump station can be used nearby to achieve the boosting operation of the emulsion.

[0043] The disclosed embodiment uses a boosting device to supplement the pressure of each hydraulic support on the comprehensive mining working face at a position near the working face, without the need for an additional high-pressure boosting pump, thereby making the hydraulic system simple, highly reliable and low-cost, and also having the function of continuously supplementing the pressure of the hydraulic supports.

[0044] The second embodiment of the disclosed embodiment provides a hydraulic system for a fully mechanized mining face, such as Figure 2 As shown, the hydraulic system includes a hydraulic pump station 101, a booster device 103, a first electromagnetic reversing valve 104, a host computer 105, a second electromagnetic reversing valve 106 and a first hydraulically controlled one-way valve 107, wherein the hydraulic pump station 101 is connected to the hydraulic support and the booster device 103 through pipelines; the first electromagnetic reversing valve 104 is arranged between the hydraulic pump station 101 and the booster device 103, and the second electromagnetic reversing valve 106 is arranged between the hydraulic pump station 101 and the hydraulic support, where the first electromagnetic reversing valve 104 is used to control the booster device 103, and the second electromagnetic reversing valve 106 is used to control the hydraulic support. The hydraulic pump station 101 in this embodiment has a total liquid inlet P and a total liquid return port T. During the normal pressure replenishment operation, the liquid inlet end of the booster device 103 is connected to the total liquid inlet P of the hydraulic pump station 101, and the liquid return end of the booster device 3 is connected to the total liquid return port T of the hydraulic pump station 101.

[0045] Furthermore, the boosting device 103 is connected to the hydraulic support through a pipeline, and the first hydraulically controlled one-way valve 107 is arranged between the boosting device 103 and the hydraulic support.

[0046] In addition, a pump station overflow valve 102 is provided on the liquid outlet side of the hydraulic pump station 101 to prevent the hydraulic pump station 101 from overflowing.

[0047] The hydraulic system for the comprehensive mining working face is used to realize fluid supply and pressure replenishment operations for the hydraulic support. In this embodiment, the hydraulic support includes a first column 110 and a second column 111. The first column 110 is connected to the second hydraulically controlled one-way valve 108, and the second column 111 is connected to the third hydraulically controlled one-way valve 109. The second hydraulically controlled one-way valve 108 and the third hydraulically controlled one-way valve 109 are both connected to the first hydraulically controlled one-way valve 107. The first hydraulically controlled one-way valve 107 is used to perform pressure replenishment operations on the first column 110 and the second column 111.

[0048] In addition, the second hydraulically controlled one-way valve 108 and the third hydraulically controlled one-way valve 109 are both connected to a safety valve, a pressure gauge and a pressure sensor. The pressure sensor is arranged at any position where pressure detection is required. The operation of the boosting device 103 is controlled by transmitting the pressure data collected by the pressure sensor to the host computer 105.

[0049] In this embodiment, the host computer 105 controls the first electromagnetic reversing valve 104 to make the boosting device 103 perform a boosting operation, converting the emulsion output by the hydraulic pump station 101 into a high-pressure emulsion. The high-pressure emulsion reaches the first hydraulically controlled one-way valve 107 through a pipeline, and is stored in the locking chamber of the first hydraulically controlled one-way valve 107 to prepare for the pressure replenishment of the hydraulic support column. This method can reduce the pressure replenishment time and improve work efficiency.

[0050] Furthermore, when it is necessary to perform a column raising operation, for example, the host computer 105 controls the second electromagnetic reversing valve 106 to enable the hydraulic support to perform a column raising 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 increases. At this time, when the pressure sensor detects that the fluid supply pressure of the hydraulic support is 20MPa, the fluid supply pressure here can be, for example, the pressure in the lower cavity of the column of the hydraulic support, and the host computer 105 controls the second electromagnetic reversing valve 106 to perform a boosting action; in this way, by controlling the first hydraulically controlled one-way valve 107 to open, the high-pressure emulsion prepared in the first hydraulically controlled one-way valve 107 enters the lower cavity of the first column 110 and the second column 111 respectively through the second hydraulically controlled one-way valve 108 and the third hydraulically controlled one-way valve 109, thereby realizing column pressure replenishment; when the pressure sensor detects that the fluid supply pressure exceeds 35MPa, the host computer 105 controls the second electromagnetic reversing valve 106 to execute the closing of the boosting function to stop inputting high-pressure emulsion into the hydraulic support through the first hydraulically controlled one-way valve 107.

[0051] In addition, if the boosting device 103 is directly closed, the host computer 105 can directly control the second electromagnetic reversing valve 106 to perform a pressure relief action. At this time, the return liquid end of the boosting device 3 is connected to the total liquid inlet P of the hydraulic pump station 101, and the liquid inlet of the boosting device 103 is connected to the total return liquid port T of the hydraulic pump station 101. The boosting device 103 can achieve a pressure relief function through the liquid outlet. The boosting device 103 can be used for pressure replenishment and pressure relief operations at the same time, and is also applicable to the first embodiment.

[0052] The disclosed embodiment uses a boosting device to supplement the pressure of each hydraulic support on the comprehensive mining working face at a position near the working face, without the need for an additional high-pressure boosting pump, thereby making the hydraulic system simple, highly reliable and low-cost, and also having the function of continuously supplementing the pressure of the hydraulic supports.

[0053] The third embodiment of the present disclosure provides a boosting device. The boosting device involved in this embodiment is applicable to the hydraulic system of the first embodiment or the second embodiment. Figure 1 and Figure 2 Combined with Figure 3 and Figure 4 As shown, the boosting device 103 includes a pressure reducing valve 1031, a double-acting reciprocating supercharger 1032, an accumulator 1033 and a safety valve 1034; the pressure reducing valve 1031 here can reduce the fluctuating emulsion pressure output by the hydraulic pump station to a predetermined value to ensure the stability of the inlet pressure of the double-acting hydraulic reciprocating supercharger 1032; the double-acting reciprocating supercharger 1032 can convert the emulsion of the hydraulic pump station into a high-pressure emulsion. The advantages of using the double-acting reciprocating supercharger 102 here are: first, it replaces the high-pressure boosting pump, so as to achieve the purpose of continuous automatic boosting; in addition, the use of double-acting superchargers has higher working efficiency than single-acting superchargers; further, the double-acting reciprocating supercharger 1032 has a built-in displacement valve, which has the advantages of compact structure and small size.

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

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

[0056] The working principle of the boosting device 103 in the hydraulic system is as follows: the emulsion transported 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 booster 1032 to generate high-pressure emulsion, and the high-pressure emulsion enters the locking chamber of the accumulator 1033 and the first hydraulically controlled one-way valve 107 respectively, thereby preparing for pressure replenishment.

[0057] Among them, if the generated high-pressure emulsion exceeds the set pressure of the safety valve 1034, the safety valve 1034 opens to reduce the fluid supply pressure of the system. Due to the existence of the first hydraulically controlled one-way valve 107, the opening of the safety valve 1034 here will not affect the lower chamber pressure of the column of the hydraulic support, so that the entire hydraulic system can efficiently output stable high-pressure emulsion.

[0058] Furthermore, the double-acting reciprocating booster 1032 includes a reciprocating booster cylinder 6, a hydraulically controlled reversing valve 13 and a third hydraulically controlled one-way valve 2, wherein a movable piston 7 is arranged in the reciprocating booster cylinder 6, and the hydraulically controlled reversing valve 13 here is a two-position four-way hydraulically controlled reversing valve.

[0059] Specifically, the reciprocating booster cylinder 6 includes a main cylinder body 61, and a first sub-cylinder body 62 and a second sub-cylinder body 63 are respectively arranged on both sides of the main cylinder body 61, and the main cylinder body 61 is respectively connected with the first cylinder body 62 and the second sub-cylinder body 63 on both sides. The piston 7 includes a piston body 71, and a first piston rod 72 and a second piston rod 73 are respectively arranged on both sides of the piston body 71. Here, 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 chamber 5 and a second piston chamber 8 between the piston body 71 and 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 pressurizing chamber 4 between the first auxiliary cylinder body 62 , and the second piston rod 73 reciprocates in the second auxiliary cylinder body 63 and forms a second pressurizing chamber 9 between the second auxiliary cylinder body 63 .

[0061] Furthermore, the main cylinder body 61 is symmetrically provided with a first piston chamber liquid inlet 611 and a second piston chamber liquid inlet 612, the first sub-cylinder body 62 is provided with a first pilot control port 621, a first boost chamber liquid inlet 622 and a first liquid outlet 623, and the second sub-cylinder body 63 is correspondingly provided with a second pilot control port 631, a second boost chamber liquid inlet 632 and a second liquid outlet 633.

[0062] Among them, the first piston chamber liquid inlet 611 and the second piston chamber liquid inlet 612 are connected to the device liquid inlet IN and the device liquid return port R through the hydraulically controlled reversing valve 13, the first boosting chamber liquid inlet 622 and the second boosting chamber liquid inlet 632 are connected to the device liquid inlet IN and the device liquid return port R, the first pilot control port 621 and the second pilot control port 631 are connected to the hydraulically controlled reversing valve 13, and the first liquid outlet 623 and the second liquid outlet 633 are connected to the device liquid outlet H.

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

[0064] The working principle of the double-acting reciprocating supercharger 1032 is as follows: when the device liquid inlet IN of the supercharging device 103 is connected to the system liquid inlet P of the hydraulic pump station 101, and the device liquid return port R of the supercharging device 103 is connected to the system liquid return port T of the hydraulic pump station 101, one path of the emulsion outputted by the hydraulic pump station 101 passes through the hydraulically controlled reversing valve 13 from the first piston chamber liquid inlet 611 to the first piston chamber 5, one path of the emulsion passes through the first one-way valve 1 from the first boosting chamber liquid inlet 622 to the first boosting chamber 4, and one path of the emulsion passes through the second one-way valve 12 from the second boosting chamber liquid inlet 632 to the second boosting chamber 9. Here, the device liquid return port R is connected to the second piston chamber 8 through the hydraulically controlled reversing valve 13 and the second piston chamber liquid inlet 612. 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 pushes the piston 7 Figure 4 The second boost chamber 9 moves to the right, and the volume of the second boost chamber 9 is reduced, so that the high-pressure emulsion is output from the second liquid outlet 633 through the fourth one-way valve 10 and from the liquid outlet H of the device.

[0065] As the piston 7 continues to move to the right, the first piston rod 72 passes over the first pilot control port 621. At this time, the emulsion in the first boosting chamber 4 enters the hydraulically controlled reversing valve 13 through the first pilot control port 621, causing the hydraulically controlled reversing valve 13 to reverse. At this time, the emulsion in the hydraulic pump station 101 passes through the hydraulically controlled reversing valve 13 and enters the second piston chamber 8 from the second piston chamber liquid inlet 612. The device liquid return port R is connected to the first live chamber liquid inlet 611, and the first piston chamber 5 is connected to the system liquid return port T. At this time, the piston 7 moves to the left, and the high-pressure emulsion formed in the first boosting chamber 4 is output from the first liquid outlet 623 through the third one-way valve 3 from the device liquid outlet H.

[0066] As the piston 7 moves Figure 4 The second piston rod 73 passes over the second pilot control port 631, and the emulsion in the second boosting chamber 9 enters the hydraulically controlled reversing valve 13 through the second pilot control port 631, causing the fourth hydraulically controlled reversing valve 13 to reverse direction. Then the piston 7 continues to move to the right, and the above-mentioned boosting process is repeated.

[0067] In this embodiment, the output of high-pressure emulsion can be achieved during the reciprocating motion of the piston 7 in 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 liquid inlet IN is connected to the system liquid return port T of the hydraulic pump station 101, and the device liquid return port R is connected to the system liquid inlet P of the hydraulic pump station 101, the third hydraulically controlled one-way valve 2 is opened in reverse to connect the device liquid outlet H to the system liquid return port T of the hydraulic pump station 101, and pressure relief is achieved through the device liquid outlet H.

[0069] This embodiment adopts the pressure reducing valve, the accumulator and the safety valve to stabilize the inlet pressure of the boosting device, reduce the pressure fluctuation of the output high-pressure emulsion, and has a self-protection function; by adopting a double-acting reciprocating booster, the piston can output high-pressure emulsion during the left and right reciprocating motion, thereby improving the pressure replenishment efficiency. In addition, it also has a pressure relief function, so that the boosting device has an independent pressure relief function, making the operation of the entire hydraulic system more convenient.

[0070] The disclosed embodiment uses a boosting device to supplement the pressure of each hydraulic support on the comprehensive mining working face at a position near the working face, without the need for an additional high-pressure boosting pump, thereby making the hydraulic system simple, highly reliable and low-cost, and also having the function of continuously supplementing the pressure of the hydraulic supports.

[0071] The fourth embodiment of the present disclosure provides a control method for a hydraulic support, which is applicable to the hydraulic pump station of the first embodiment and the second embodiment. Figure 5 As shown, the control method can realize the 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 a raised state and when the liquid supply pressure is greater than or equal to a first threshold, starting a boosting device to boost the emulsion.

[0073] S102, when the pressure in the lower chamber of the column of the hydraulic support is greater than or equal to a second threshold, the hydraulically controlled one-way valve used for pressurization is controlled to open to achieve a primary pressure supplement.

[0074] S103, when the pressure in the lower chamber of the column of the hydraulic support is increased to be greater than or equal to a third threshold, the hydraulically controlled one-way valve used for pressurization is controlled to close to stop the pressure replenishment.

[0075] In this embodiment, the pressure boosting device is taken as a single hydraulic support as an example to illustrate the control method for the hydraulic support. Figure 6As shown, after the hydraulic pump station 101 starts working, when the host computer 105 detects that the fluid supply pressure of the hydraulic pump station 101 is ≥ the first threshold value P1, the first threshold value here is equivalent to the starting pressure threshold value of the boosting device 103, and the host computer 105 controls the boosting device 103 to start the boosting function, thereby boosting the emulsion originally transported by the hydraulic pump station to the comprehensive mining working face to convert it into a high-pressure emulsion, and the high-pressure emulsion reaches the first hydraulically controlled one-way valve 107 through the pipeline, thereby preparing for the pressure replenishment of the column of the hydraulic support.

[0076] On the one hand, when the column of the hydraulic support is in the column raising state, the pressure in the lower cavity of the column continues to rise after the column contacts the upper base plate. When the pressure sensor detects that the pressure in the lower cavity of the column of the hydraulic support is ≥ the second threshold value P2, the host computer 105 controls the boosting solenoid valve of the hydraulic support to open and uses the hydraulically controlled one-way valve (such as the first hydraulically controlled one-way valve 107) for boosting to open. At this time, the high-pressure emulsion enters the lower cavity of the column of the hydraulic support to increase the pressure in the lower cavity of the column. When it is detected that the pressure in the lower cavity of the column rises to the third threshold value P3, the host computer 105 controls the boosting solenoid valve of the hydraulic support to close, and closes the corresponding hydraulically controlled one-way valve, thereby blocking the high-pressure emulsion from continuing to enter the lower cavity of the column, thereby completing the pressure replenishment operation of the column.

[0077] Furthermore, the control method also includes: in step S102, when the pressure in the lower chamber of the column of the hydraulic support is greater than or equal to a second threshold value, the hydraulically controlled one-way valve corresponding to the hydraulic support is controlled to open to achieve a primary pressure replenishment; when the pressure in the lower chamber of the column 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 perform a secondary pressure replenishment.

[0078] Specifically, when the first predetermined time t1 has passed during the process of compensating the lower cavity of the column and the pressure in the lower cavity of the column has not reached the third threshold value P3, the upper computer 105 controls to turn off the boosting function of the boosting device 103 and turns on the boosting device 103 again after waiting for the second predetermined time t2, thereby performing secondary pressure replenishment for the hydraulic support, and then when the pressure in the lower cavity of the column reaches the third threshold value P3, the boosting function of the boosting device 103 is turned off to complete the pressure replenishment.

[0079] Furthermore, the control method further comprises: after a third predetermined time has passed during the secondary pressure replenishment process, when the pressure in the lower cavity of the column is less than the third threshold value, controlling the output of an error flag.

[0080] Specifically, when the pressure in the lower cavity of the column still does not reach the third threshold value P3 after the third predetermined time t3 during the secondary pressure replenishment process, the host computer 105 controls the electro-hydraulic control device to output an error flag.

[0081] Furthermore, on the other hand, the control method also includes: when the column of the hydraulic support is in a supporting state and when the pressure in the lower chamber of the column is less than a fourth threshold, controlling the hydraulically controlled one-way valve corresponding to the hydraulic support to open so that the pressure in the lower chamber is increased to a third threshold.

[0082] Specifically, when the column of the hydraulic support 100 is in a supporting state, and the pressure sensor detects that the pressure in the lower cavity of the column is lower than the fourth threshold value P4, the upper computer 105 controls the boosting solenoid valve of the hydraulic support to open, and opens the hydraulically controlled one-way valve (for example, the first hydraulically controlled one-way valve 107) used for boosting. At this time, high-pressure emulsion enters the lower cavity of the column to increase the pressure in the lower cavity of the column to the third threshold value P3.

[0083] Similarly, when the first predetermined time t1 has passed during the process of compensating the lower cavity of the column and the pressure in the lower cavity of the column has not reached the third threshold value P3, the upper computer 105 controls to turn off the boosting function of the boosting device 103 and turns on the boosting function of the boosting device 103 again after waiting for the second predetermined time t2, thereby performing secondary pressure replenishment for the hydraulic support, that is, when the pressure in the lower cavity of the column reaches the third threshold value P3, the boosting function of the boosting device 103 is turned off to complete the pressure replenishment.

[0084] In addition, when the pressure in the lower cavity of the column still does not reach the third threshold value P3 after the third predetermined time t3 during the secondary pressure replenishment process, the host computer 105 controls the output of an error flag.

[0085] Furthermore, the control method further comprises: when the hydraulic pump station stops supplying fluid and when the fluid supply pressure of the hydraulic pump station is lower than a fifth threshold, controlling the boosting device to start a pressure relief function.

[0086] Specifically, when the hydraulic pump station stops supplying fluid and when the hydraulic system pressure of the hydraulic pump station is lower than the fifth threshold value P5, the host computer 105 controls the boosting device 103 to start the pressure relief function to complete the pressure relief inside the boosting device 103 and between the boosting device 103 and the first hydraulically controlled one-way valve 107.

[0087] The disclosed embodiment uses a boosting device to supplement the pressure of each hydraulic support on the comprehensive mining working face at a position near the working face, without the need for an additional high-pressure boosting pump, thereby making the hydraulic system simple, highly reliable and low-cost, and also having the function of continuously supplementing the pressure of the hydraulic supports.

[0088] In the above embodiments of the present disclosure, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

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

[0090] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple 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 realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present disclosure.

[0091] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0092] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A boosting device, characterized in that: The invention comprises a pressure reducing valve, a double-acting reciprocating supercharger, an accumulator and a safety valve. The double-acting reciprocating supercharger has a device liquid inlet, a device liquid return port and a device liquid outlet. The double-acting reciprocating supercharger comprises a reciprocating supercharger cylinder, a hydraulically controlled reversing valve for supercharging and a hydraulically controlled one-way valve for relieving pressure. A movable piston is arranged in the reciprocating supercharger cylinder, and supercharging or relieving pressure is achieved by the movement of the piston in the reciprocating supercharger cylinder.

2. The boosting device according to claim 1, characterized in that: The reciprocating booster cylinder includes a main cylinder body, a first sub-cylinder body and a second sub-cylinder body are respectively arranged on both sides of the main cylinder body, the piston includes a piston body, a first piston rod and a second piston rod are respectively arranged on both sides of the piston body, the piston body reciprocates in the main cylinder body and forms a first piston chamber and a second piston chamber between the main cylinder body; the first piston rod reciprocates in the first sub-cylinder body and forms a first booster chamber between the first sub-cylinder body, and the second piston rod reciprocates in the second sub-cylinder body and forms a second booster chamber between the second sub-cylinder body.

3. The boosting device according to claim 2, characterized in that: The main cylinder body is symmetrically provided with a first piston chamber liquid inlet and a second piston chamber liquid inlet, and the first piston chamber liquid inlet and the second piston chamber liquid inlet are connected with the device liquid inlet and the device liquid return port through the hydraulically controlled reversing valve for pressurization.

4. The boosting device according to claim 3, characterized in that: A first one-way valve is arranged between the liquid inlet of the device and the first piston chamber, and a second one-way valve is arranged between the liquid inlet of the device and the second piston chamber.

5. The boosting device according to claim 4, characterized in that: A first boost chamber liquid inlet and a first liquid outlet are arranged on the first sub-cylinder body, and a second boost chamber liquid inlet and a second liquid outlet are correspondingly arranged on the second sub-cylinder body. The first boost chamber liquid inlet and the second boost chamber liquid inlet are connected to the device liquid inlet and the device return liquid, and the first liquid outlet and the second liquid outlet are connected to the device liquid outlet.

6. The boosting device according to claim 5, characterized in that: A third one-way valve is arranged between the first pressurizing chamber and the liquid outlet of the device, and a fourth one-way valve is arranged between the second pressurizing chamber and the liquid outlet of the device.

7. The boosting device according to claim 5, characterized in that: The first auxiliary cylinder body is provided with a first pilot control port, and the second auxiliary cylinder body is correspondingly provided with a second pilot control port. The first pilot control port and the second pilot control port are connected to the hydraulically controlled reversing valve for pressurization.

8. A hydraulic system for a fully mechanized mining face, characterized in that: It comprises a hydraulic pump station, at least one hydraulic support and the boosting device according to any one of claims 1-7.

9. The hydraulic system for fully mechanized mining working face according to claim 8, characterized in that: When performing a pressure replenishment operation, the device liquid inlet is connected to the system liquid inlet of the hydraulic pump station, the device liquid return port is connected to the system liquid return port of the hydraulic pump station, and the device liquid outlet is connected to the hydraulic support through a hydraulically controlled reversing valve.

10. The hydraulic system for fully mechanized mining working face according to claim 9, characterized in that: When the pressure relief operation is performed, when the liquid inlet of the device is connected to the system liquid return port of the hydraulic pump station, the liquid return port of the device is connected to the system liquid inlet of the hydraulic pump station, the hydraulically controlled one-way valve used for pressure relief is controlled to connect the liquid outlet of the device to the system liquid return port of the hydraulic pump station and pressure relief is achieved through the liquid outlet of the device.

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