Hydraulic control one-way valve assembly for differential two-way lock and differential two-way lock

Abstract

The hydraulic control one-way valve assembly comprises a guide sleeve and a threaded sleeve which are oppositely arranged, a valve seat is arranged on the inner side of the end, facing the guide sleeve, of the threaded sleeve, a movable valve element is arranged in the threaded sleeve, and the guide sleeve is of a two-way through structure and comprises an ejector rod cavity and a liquid passing cavity; the ejector rod cavity and the liquid passing cavity are separated through a separation part, a through hole is formed in the separation part, an ejector rod is arranged in the ejector rod cavity and can move to push the valve element, a valve element working opening is formed in the side face of the threaded sleeve, a valve element liquid supply opening and a valve element liquid return opening are formed in the side face of the guide sleeve, the valve element liquid supply opening is communicated with the liquid passing cavity, and the valve element working opening is communicated with an inner cavity of the threaded sleeve. A control cavity is formed between the ejector rod and the guide sleeve, and the control cavity is communicated with external liquid supply through the valve element pressure control opening. According to the embodiment, the function of the differential two-way lock under the conventional working condition is achieved, and the differential two-way lock can also be suitable for the non-differential working condition, so that the differential two-way lock can be suitable for various occasions.

Description

Technical Field

[0001] This disclosure relates to the technical field of hydraulic control valves, and more specifically, to a hydraulic control check valve assembly for a differential two-way lock and a differential two-way lock. Background Technology

[0002] Hydraulic valves are fundamental components of electro-hydraulic control systems. By controlling these valves, the jacks on the hydraulic support can perform their actions in an orderly manner. Among them, the hydraulically controlled check valve and the differential two-way lock, by timely locking one or both sides of the hydraulic chamber within the jack, enable the jack to maintain its supporting force, thereby maintaining the working posture of the hydraulic support.

[0003] Existing hydraulic supports in coal mines use two-way locks to control jacks. Under certain operating conditions, both ports PA and PB need to be supplied with fluid simultaneously to allow the jack rod to open the valve. This is achieved by isolating the jack rod chamber and connecting it separately to the system's low-pressure pipeline. When both ports PA and PB are supplied with fluid simultaneously, the jack rod moves due to unequal forces on both sides, thus opening the valve. However, when using a conventional hydraulically controlled check valve, the valve core assembly is characterized by the jack rod being positioned opposite the cone valve. The jack rod chamber is connected to the supply port PA through a throttling orifice. In this type of hydraulically controlled check valve, when both ports PA and PB are supplied with fluid simultaneously, the jack rod remains stationary due to the balanced hydraulic pressure at both ends, preventing the locking chamber from opening. Furthermore, existing differential two-way locks suffer from poor overall integrity, complex structure, poor usability and maintenance, and poor interface compatibility. Summary of the Invention

[0004] In view of this, the present disclosure aims to provide a hydraulically controlled check valve assembly for a differential two-way lock and a differential two-way lock to solve the above-mentioned technical problems in the prior art.

[0005] One aspect of this disclosure provides a hydraulically controlled one-way valve assembly for a differential two-way lock, including a guide sleeve and a threaded sleeve disposed opposite to each other. A valve seat is disposed on the inner side of the end of the threaded sleeve facing the guide sleeve. A movable valve core is disposed within the threaded sleeve. The guide sleeve has a two-way through structure, including a push rod cavity and a liquid passage cavity. The push rod cavity and the liquid passage cavity are separated by a partition portion, and a through hole is provided on the partition portion. A push rod is disposed within the push rod cavity, and the push rod is movable to push the valve core. A valve core working port is provided on the side of the threaded sleeve, and a valve core supply port and a valve core return port are provided on the side of the guide sleeve. The valve core supply port communicates with the liquid passage cavity, the valve core working port communicates with the inner cavity of the threaded sleeve, and the valve core return port communicates with the push rod cavity. A control cavity is formed between the push rod and the guide sleeve, and the control cavity communicates with an external liquid supply through a valve core pressure control port.

[0006] In some embodiments, one side of the valve core is connected to the bottom of the threaded sleeve via a first spring, and the other side of the valve core abuts against the valve seat under the action of the first spring.

[0007] In some embodiments, the valve core has a U-shaped structure, the opening of the valve core is oriented toward the bottom of the threaded sleeve, and the first spring is disposed inside the opening of the valve core.

[0008] In some embodiments, a second spring is provided on the push rod, one end of the second spring is sleeved on the push rod, and the other end of the second spring is connected to the partition. Under the action of the second spring, at least a portion of the push rod can pass through the through hole and enter the liquid passage chamber.

[0009] In some embodiments, the push rod includes a bottom, a middle portion, and a head arranged sequentially. The bottom is located on a side away from the threaded sleeve. The bottom includes a sliding section and a cavity section. The cavity section is located away from the middle portion. The cross-sectional dimension of the sliding section is larger than the cross-sectional dimension of the cavity section. The sliding section slides against the inner surface of the guide sleeve. The cavity section is used to form the control cavity together with the guide sleeve.

[0010] In some embodiments, the head is positioned on the side facing the threaded sleeve, and it is able to pass through the through hole and abut against the end face of the valve core.

[0011] In some embodiments, a first seal is provided on the inner side of the through hole, and the first seal provides a seal between the head and the through hole.

[0012] In some embodiments, an elastic retaining ring is also provided inside the guide sleeve, which can limit the movement of the top rod.

[0013] In some embodiments, a second seal is provided on the side of the guide sleeve between the return port and the valve core supply port, thereby isolating the liquid passage chamber from the push rod chamber.

[0014] Another aspect of this disclosure provides a differential two-way lock, which includes a hydraulically controlled check valve assembly according to any of the preceding claims, the differential two-way lock being connected to a hydraulic cylinder, a piston being disposed within the hydraulic cylinder, and the interior of the hydraulic cylinder being divided into a rod-side chamber and a rodless chamber by the piston.

[0015] In some embodiments, the differential two-way lock includes a lock body, within which two hydraulically controlled one-way valve assemblies are arranged side by side. A first lock body liquid supply port and a second lock body liquid supply port are provided on a first surface of the lock body, and the first lock body liquid supply port and the second lock body liquid supply port are respectively connected to the valve core liquid supply port of the corresponding hydraulically controlled one-way valve assembly. A first lock body working port and a second lock body working port are provided on a second surface of the lock body, and the first lock body working port and the second lock body working port are connected to the valve core working port of the corresponding hydraulically controlled one-way valve assembly.

[0016] In some embodiments, the first lock body working port is connected to the rod cavity via an external pipe, and the second lock body working port is connected to the rodless cavity via an external pipe.

[0017] In some embodiments, the liquid supply port of the lock body corresponding to one of the hydraulic check valve assemblies is connected to the valve core pressure control port corresponding to another of the hydraulic check valve assemblies through a first internal channel.

[0018] In some embodiments, the first lock body working port and the second lock body working port are located between the first lock body liquid supply port and the second lock body liquid supply port, and the first lock body liquid supply port and the first lock body working port are offset from each other, and the second lock body liquid supply port and the second lock body working port are offset from each other.

[0019] In some embodiments, a lock body pressure control port is provided on the first surface of the lock body. The lock body pressure control port is directly connected to the return fluid and communicates with the push rod cavity in each of the hydraulic control check valve assemblies through a second internal channel, so that the push rod cavity is kept in a low-pressure state.

[0020] In some embodiments, the lock body is further provided with a liquid outlet, which is correspondingly provided with the hydraulic control check valve assembly, and a plug is provided inside the liquid outlet.

[0021] The differential two-way lock described in this embodiment can realize the functions of a conventional differential two-way lock under normal working conditions, and can also be applied to non-differential working conditions, thus enabling it to be applicable to a variety of occasions.

[0022] To make the above-mentioned objects, features and advantages of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and are used, together with the description and claims, to illustrate the disclosed embodiments. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method. The accompanying drawings, which are provided to further understand this disclosure and form part of this application, are used to explain the illustrative embodiments of this disclosure and do not constitute an undue limitation of this disclosure. In the drawings:

[0024] Figure 1 This is a schematic diagram of the structure of a hydraulically controlled check valve assembly for a differential bidirectional lock according to an embodiment of the present disclosure;

[0025] Figure 2 This is a structural cross-sectional view of a differential bidirectional lock according to an embodiment of the present disclosure;

[0026] Figure 3 This is a three-dimensional structural schematic diagram of a differential bidirectional lock according to an embodiment of the present disclosure;

[0027] Figure 4 This is a schematic diagram of the structure of a hydraulically controlled check valve assembly for a differential bidirectional lock according to another embodiment of this disclosure;

[0028] Figure 5 This is a schematic diagram of the differential bidirectional lock in another embodiment of the present disclosure.

[0029] Figure label:

[0030] 1-First spring; 2-Second spring; 3-Valve seat; 4-Valve core; 5-Push rod; 51-Bottom; 511-Sliding section; 512-Cavity section; 52-Middle section; 53-Head; 6-Guide sleeve; 61-Push rod cavity; 62-Liquid passage cavity; 63-Separation section; 64-Through hole; 65-First seal; 66-Second seal; 7-Threaded sleeve; 10-Hydraulic check valve assembly; 20-Lock body; 21-First internal channel; 22-Second internal channel; 23-Plug; 30-Hydraulic cylinder; 31-Rod chamber; 32-Rodless chamber; 33-Piston; 34-Piston rod. Detailed Implementation

[0031] The specific embodiments of this disclosure will now be described in detail with reference to the accompanying drawings, but these are not intended to limit the scope of this disclosure.

[0032] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this disclosure will be apparent to those skilled in the art.

[0033] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present disclosure and, together with the general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

[0034] These and other features of this disclosure will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0035] It should also be understood that although this disclosure has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this disclosure, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0036] The above and other aspects, features and advantages of this disclosure will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0037] Specific embodiments of the present disclosure are described thereafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure and can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the present disclosure. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of substantially any suitable detailed structures.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in still another embodiment,” all of which may refer to one or more of the same or different embodiments according to this disclosure.

[0040] The first embodiment of this disclosure provides a hydraulically controlled check valve assembly for a differential bidirectional lock, wherein the differential bidirectional lock is used to drive a jack in a hydraulic support. Figures 1-3 The hydraulic control check valve assembly 10 of this embodiment is shown. The hydraulic control check valve assembly 10 is disposed in the differential bidirectional lock. Generally, two hydraulic control check valve assemblies 10 are arranged side by side in the differential bidirectional lock, so that the flow of the working medium is controlled by the differential bidirectional lock 20 to drive the jack.

[0041] Specifically, the hydraulic control check valve assembly 10 includes a guide sleeve 6 and a threaded sleeve 7 disposed opposite to each other. The outer surface of the threaded sleeve 7 is provided with threads so that the hydraulic control check valve assembly 10 can be rotated and screwed into the differential two-way lock. A valve seat 3 is provided on the inner side of the end of the threaded sleeve 7 facing the guide sleeve 6. A valve core 4 is provided inside the threaded sleeve 7. One side of the valve core 4 is connected to the bottom inside the threaded sleeve 7 through the first spring 1, and the other side of the valve core 4 abuts against the valve seat 3 under the action of the first spring 1.

[0042] When the valve core 4 and the valve seat 3 come into contact, a seal is formed. To further enhance the sealing performance, the valve core 4 and the valve seat 3 are connected by a hard seal. The valve core 4, for example, is made of metal and can be treated with vacuum quenching technology, followed by precision grinding. This results in a valve core 4 with high hardness. Compared to seals made of soft materials, hard seals not only have better sealing performance but can also withstand ultra-high pressure, thereby extending the service life of the valve core 4.

[0043] Preferably, the valve core 4 here adopts a U-shaped structure, and the opening of the valve core 4 is arranged facing the bottom of the screw sleeve 7. The first spring 1 is arranged in the opening of the valve core 4, so that the space inside the screw sleeve 7 can be fully utilized to accommodate the first spring 1, thereby facilitating the movement of the valve core 4 inside the screw sleeve 7.

[0044] The guide sleeve 6 in this embodiment is a bidirectional through structure, which includes a push rod cavity 61 and a liquid passage cavity 62. The push rod cavity 61 and the liquid passage cavity 62 are separated by a partition 63. Here, the liquid passage cavity 62 is located close to the threaded sleeve 7, and the push rod cavity 61 is located away from the threaded sleeve 7.

[0045] Specifically, a movable push rod 5 is provided in the push rod cavity 61, a through hole 64 is provided on the partition 63, and a second spring 2 is provided on the push rod 5. One end of the second spring 2 is sleeved on the push rod 5, and the other end is connected to the partition 63. In this way, under the action of the second spring 2, the push rod 5 can at least partially pass through the through hole 64 and enter the liquid passage cavity 62, thereby abutting against the valve core 4 to push the valve core 4 to move.

[0046] In the hydraulic control check valve assembly 10 of this embodiment, the side of the screw sleeve 7 is provided with a valve core working port A, and the side of the guide sleeve 6 is provided with a valve core supply port PA and a valve core return port R. The valve core supply port PA is connected to the liquid passage chamber 62, so that an external working medium can be input into the liquid passage chamber 62. The valve core working port A is connected to the inner cavity of the screw sleeve 7, and the valve core return port R is connected to the push rod cavity 61.

[0047] Further, the push rod 5 includes a bottom 51, a middle portion 52, and a head 53 arranged sequentially. The bottom 51 is located on the side away from the threaded sleeve 7. The bottom 51 includes a sliding section 511 and a cavity section 512. The cavity section 512 is located away from the middle portion 52. The cross-sectional dimension of the sliding section 511 is larger than that of the cavity section 512, and the cross-sectional dimension of the sliding section 511 is also larger than that of the middle portion 52. The sliding section 511 slides against the inner surface of the guide sleeve 6. The cavity section 512 forms the control cavity C. In addition, each hydraulic check valve assembly 10 is provided with a valve core pressure control port K, which is used to connect the control cavity C to an external liquid supply.

[0048] Furthermore, the head 53 is located on the side facing the screw sleeve 7, and it can pass through the through hole 64 into the liquid passage chamber 62 and abut against the end face of the valve core 4.

[0049] Furthermore, a first sealing element 65 is provided inside the through hole 64 of the partition 63. The first sealing element 65 seals between the head 53 of the push rod 5 and the through hole 64. In this way, the first sealing element 65 can seal between the push rod cavity 61 and the liquid passage cavity 62, thereby isolating the return port R and the valve core supply port PA and preventing them from communicating.

[0050] In addition, an elastic retaining ring is provided inside the guide sleeve 6, which can limit the position of the top rod 5.

[0051] In another embodiment, a second seal 66 is provided on the outer surface of the guide sleeve 6 between the return port R and the valve core supply port PA. The second seal 66 is used to isolate the liquid passage chamber 62 from the push rod chamber 61, and can be, for example, a sealing ring.

[0052] This embodiment can realize the function of differential bidirectional lock under normal working conditions based on the hydraulic control check valve assembly, and it can also be applied to non-differential working conditions, thus enabling it to be applicable to a variety of occasions.

[0053] A second embodiment of this disclosure provides a differential two-way lock, which includes the hydraulically controlled check valve assembly 10 described in the above embodiments, such as... Figure 2 and Figure 3 As shown, the differential bidirectional lock in this embodiment is connected to, for example, a hydraulic cylinder 30, which is a driving component of the jack. A piston 33 is installed inside the hydraulic cylinder 30, and the piston 33 is connected to a piston rod 34. The interior of the hydraulic cylinder 30 is divided into a rod chamber 31 and a rodless chamber 32 by the piston 33. The movement of the piston 33 drives the jack to extend or retract via the piston rod 34. The valve core supply port of the hydraulically controlled check valve assembly 10 is connected to an external fluid supply, and its working port is connected to either the rod chamber 31 or the rodless chamber 32.

[0054] Furthermore, the differential two-way lock includes a lock body 20, within which two hydraulically controlled check valve assemblies 10 are arranged side-by-side, with the two hydraulically controlled check valve assemblies 10 having the same orientation within the lock body 20. The lock body 20 has an inner cavity for accommodating the hydraulically controlled check valve assemblies 10. A portion of the threaded sleeve 7 within each hydraulically controlled check valve assembly 10 is screwed into the inner cavity of the lock body 20 to achieve installation within the lock body 20. Here, after the hydraulically controlled check valve assembly 10 is screwed into the lock body 20, the elastic retaining ring inside it no longer bears tension, thus releasing the restriction on the push rod 5 within the hydraulically controlled check valve assembly 10.

[0055] Furthermore, a first lock body liquid supply port A1 and a second lock body liquid supply port B1 are provided on the first surface of the lock body 20. The first lock body liquid supply port A1 and the second lock body liquid supply port B1 are located between the two hydraulic control check valve assemblies 10. The first surface is perpendicular to the length direction of the hydraulic control check valve assembly 10. Here, the first lock body liquid supply port A1 and the second lock body liquid supply port B1 are used to supply liquid to the interior of the corresponding hydraulic control check valve assembly 10, and they are respectively connected to the first valve core liquid supply port PA and the second valve core liquid supply port PB of the corresponding hydraulic control check valve assembly 10.

[0056] Furthermore, a first lock body working port A2 and a second lock body working port B2 are provided on the second surface of the lock body 20. Here, the second surface is opposite to the first surface, and the first lock body working port A2 and the second lock body working port B2 are also located between the two hydraulic control check valve assemblies 10.

[0057] The first lock body working port A2 is connected to the rod chamber 31 of the hydraulic cylinder 30 via an external pipeline, and the second lock body working port B2 is connected to the rodless chamber 32 of the hydraulic cylinder 30 via an external pipeline. In this way, the movement of the piston 33 can be controlled by supplying working medium to the rod chamber 31 and / or the rodless chamber 32 through the first lock body working port A2 and / or the second lock body working port B2.

[0058] Furthermore, since a control cavity C is formed between the bottom 51 of the push rod 5 and the guide sleeve 6 within each of the hydraulically controlled check valve assemblies 10, particularly between the cavity section 512 and the guide sleeve 6, the movement of the push rod 5 is controlled by adjusting the pressure change of the liquid within the control cavity C. For this purpose, the liquid supply port of the lock body corresponding to any one of the hydraulically controlled check valve assemblies 10 is connected to the valve core pressure control port of another hydraulically controlled check valve assembly 10 via a first internal channel 21, which is formed within the lock body 20.

[0059] Specifically, the first lock body liquid supply port A1 is connected to the first valve core liquid supply port PA of the hydraulic control check valve assembly 10 located near the first lock body liquid supply port A1, and is also connected to the control chamber C of the hydraulic control check valve assembly 10 located away from the first lock body liquid supply port A1 via the first internal channel 21. Similarly, the second lock body liquid supply port B1 is connected to the second valve core liquid supply port PB of the hydraulic control check valve assembly 10 located near the second lock body liquid supply port B1, and is also connected to the control chamber C of the hydraulic control check valve assembly 10 located away from the second lock body liquid supply port B1 via the first internal channel 21.

[0060] Specifically, the first lock body liquid supply port A1 is used to supply liquid to the control chamber C of the hydraulic control check valve assembly 10, which is away from the first lock body liquid supply port A1, and the second lock body liquid supply port B1 is used to supply liquid to the control chamber C in the hydraulic control check valve assembly 10, which is away from the second lock body liquid supply port B1. By supplying liquid to the control chamber C, the push rod 5 in the corresponding hydraulic control check valve assembly 10 is pushed to move toward or away from the valve core 4.

[0061] In addition, the first lock body working port A2 is connected to the first valve core working port A of the hydraulic control check valve assembly 10 near the first lock body working port A2, and the second lock body working port B2 is connected to the second valve core working port B of the hydraulic control check valve assembly 10 near the second lock body working port B2.

[0062] In this embodiment, the first lock body liquid supply port A1 is correspondingly arranged with the first lock body working port A2, and the second lock body liquid supply port B1 is correspondingly arranged with the second lock body working port B2. Preferably, the lock body 20 is internally perforated in a staggered manner, such that the first lock body liquid supply port A1 and the first lock body working port A2 are staggered, and the second lock body liquid supply port B1 and the second lock body working port B2 are also staggered. Further, the first lock body working port A2 and the second lock body working port B2 are located between the first lock body liquid supply port A1 and the second lock body liquid supply port B1.

[0063] Furthermore, since a second sealing element 66 is provided on the outer surface of the guide sleeve 6 of the hydraulic check valve assembly 10, which is located between the return port R and the valve core supply port PA and isolates the liquid passage chamber 62 from the push rod chamber 61, a lock body pressure control port D is also provided on the first surface of the lock body 20. The lock body pressure control port D is used in conjunction with the second sealing element 66. The lock body pressure control port D is connected to the push rod chamber 61 in each of the hydraulic check valve assemblies 10 through the second internal channel 22. In specific implementation, the valve body pressure control port 22 is always directly connected to the return liquid, so that the push rod chamber 61 in the two hydraulic check valve assemblies 10 is always kept in a low-pressure state.

[0064] In addition, the lock body 20 is provided with a liquid outlet, which is corresponding to the hydraulic control check valve assembly 10, and a plug 23 is provided in the liquid outlet.

[0065] The differential two-way lock of this embodiment can be used when the jack of the hydraulic support is in differential operation. In the process of controlling the jack, when the jack extends, high-pressure emulsion enters the hydraulic control check valve assembly 10 located below the differential two-way lock body through the second lock body supply port B2 of the lock body 20. This emulsion overcomes the forces of the first spring 1 and the second spring 2 within the hydraulic control check valve assembly 10. Figure 2 The valve core 4 is pushed from the left side, causing the high-pressure emulsion to enter the rodless chamber 32 through the second lock body working port B2. This, in turn, pushes the piston rod 34 towards the piston 33 according to the pressure difference on both sides of the piston 33. Figure 2 The jack is moved upwards and downwards to extend.

[0066] Furthermore, the high-pressure emulsion can also be supplied through the second lock body supply port B2 on the lock body 20 via the first internal channel 21. Figure 2 The valve core pressure control port of the upper hydraulic check valve assembly 10 enters the hydraulic check valve assembly 10, pushing the valve core 4 in the upper hydraulic check valve assembly 10 to move in the opposite direction. In this way, the emulsion in the rod chamber 31 flows out through the hydraulic check valve assembly 10 on the opposite side along the path of the first lock body working port A2 → the first lock body liquid supply port A1.

[0067] When the jack performs the contraction action, the high-pressure emulsion flows through... Figure 2 In the differential two-way lock, the hydraulic control check valve assembly 10 located above the differential two-way lock enters the rod chamber 31 along the path from the first lock body supply port A1 to the first lock body working port A2. Simultaneously, the valve core 4 of the other hydraulic control check valve assembly 10 moves in the opposite direction via the symmetrical first internal channel 21. As a result, the emulsion in the rodless chamber 32 flows out of the lock body 20 along the path from the second lock body working port B2 to the second lock body supply port B1, thereby completing the cylinder closing action.

[0068] Furthermore, the differential bidirectional lock described in this embodiment can also be used in the non-differential operation of the hydraulic support jack. In this condition, it is not necessary to ensure that the valves are open when both valve core supply ports, namely the first valve core supply port A and the second valve core supply port B, are simultaneously supplied with liquid. Therefore, the drain channel of the push rod cavity in the lock body 20 can be eliminated, that is, the second seal 66 on the guide sleeve 6 of each hydraulic control check valve assembly 10 can be removed. Thus, the lock body 20 does not need to be provided with the lock body pressure control port D. The structure of the hydraulic control check valve 10 is as follows: Figure 4 The structure of the differential bidirectional lock formed based on it is as follows: Figure 5 As shown.

[0069] The hydraulically controlled check valve described in this embodiment operates on the same principle as a conventional check valve under normal circumstances, allowing liquid to pass through only in one direction and preventing liquid from passing through in the opposite direction. In this embodiment, two hydraulically controlled check valve assemblies are installed in the same lock body. By controlling the pressure of the rodless and rod-side liquid chambers within the jack's hydraulic cylinder, a differential two-way lock function is achieved. When the seal for isolating the rod chamber and the liquid passage chamber on the guide sleeve is removed from the hydraulically controlled check valve assembly, and a lock body without a pressure control port is used, the conventional differential two-way lock function can also be achieved. Furthermore, this embodiment can accommodate simultaneous liquid supply from multiple supply ports, thus meeting different usage requirements.

[0070] This embodiment can realize the functions of a conventional differential bidirectional lock under conventional differential operating conditions, and it can also be applied to non-differential operating conditions, thus enabling it to be applicable to a variety of occasions.

[0071] Furthermore, the features of the embodiments shown in the accompanying drawings or the various embodiments mentioned in this specification should not be construed as independent embodiments. Rather, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the accompanying drawings.

[0072] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A hydraulically controlled check valve assembly for a differential bidirectional lock, characterized in that, The device includes a guide sleeve and a threaded sleeve arranged opposite to each other. A valve seat is provided on the inner side of the end of the threaded sleeve facing the guide sleeve. A movable valve core is provided inside the threaded sleeve. The guide sleeve has a bidirectional through structure, including a push rod cavity and a liquid passage cavity. The push rod cavity and the liquid passage cavity are separated by a partition, which has a through hole. A push rod is provided in the push rod cavity. The push rod is movable to push the valve core. A valve core working port is provided on the side of the threaded sleeve. A valve core supply port and a valve core return port are provided on the side of the guide sleeve. The valve core supply port communicates with the liquid passage cavity. The valve core working port communicates with the inner cavity of the threaded sleeve. The valve core return port communicates with the push rod cavity. A control cavity is formed between the push rod and the guide sleeve. The control cavity is connected to an external liquid supply through a valve core pressure control port.

2. The hydraulically controlled check valve assembly according to claim 1, characterized in that, One side of the valve core is connected to the bottom of the screw sleeve via a first spring, and the other side of the valve core abuts against the valve seat under the action of the first spring.

3. The hydraulically controlled check valve assembly according to claim 2, characterized in that, The valve core adopts a U-shaped structure, and the opening of the valve core is set towards the bottom of the screw sleeve. The first spring is set inside the opening of the valve core.

4. The hydraulically controlled check valve assembly according to claim 1, characterized in that, A second spring is provided on the push rod, one end of which is sleeved on the push rod, and the other end of which is connected to the partition. Under the action of the second spring, at least a portion of the push rod can pass through the through hole and enter the liquid passage chamber.

5. The hydraulically controlled check valve assembly according to claim 1, characterized in that, The push rod includes a bottom, a middle part, and a head arranged sequentially. The bottom is located on the side away from the threaded sleeve. The bottom includes a sliding section and a cavity section. The cavity section is located away from the middle part. The cross-sectional dimension of the sliding section is larger than the cross-sectional dimension of the cavity section. The sliding section slides against the inner surface of the guide sleeve. The cavity section is used to form the control cavity together with the guide sleeve.

6. The hydraulically controlled check valve assembly according to claim 5, characterized in that, The head is positioned on the side facing the threaded sleeve, and it can pass through the through hole and abut against the end face of the valve core.

7. The hydraulically controlled check valve assembly according to claim 5, characterized in that, A first sealing element is provided on the inner side of the through hole, and the first sealing element seals between the head and the through hole.

8. The hydraulically controlled check valve assembly according to claim 1, characterized in that, An elastic retaining ring is also provided inside the guide sleeve, which can limit the position of the top rod.

9. The hydraulically controlled check valve assembly according to claim 1, characterized in that, A second seal is provided on the side of the guide sleeve between the return port and the valve core supply port, thereby isolating the liquid passage chamber from the push rod chamber.

10. A differential bidirectional lock, characterized in that, Includes the hydraulically controlled check valve assembly according to any one of claims 1-9, wherein the differential bidirectional lock is connected to the hydraulic cylinder, a piston is provided inside the hydraulic cylinder, and the interior of the hydraulic cylinder is divided into a rod chamber and a rodless chamber by the piston.

11. The differential bidirectional lock according to claim 10, characterized in that, The differential two-way lock includes a lock body, in which two hydraulically controlled one-way valve assemblies are arranged side by side. A first lock body liquid supply port and a second lock body liquid supply port are provided on the first surface of the lock body. The first lock body liquid supply port and the second lock body liquid supply port are respectively connected to the valve core liquid supply port of the corresponding hydraulically controlled one-way valve assembly. A first lock body working port and a second lock body working port are provided on the second surface of the lock body. The first lock body working port and the second lock body working port are connected to the valve core working port of the corresponding hydraulically controlled one-way valve assembly.

12. The differential bidirectional lock according to claim 11, characterized in that, The first lock body working port is connected to the rod cavity via an external pipe, and the second lock body working port is connected to the rodless cavity via an external pipe.

13. The differential bidirectional lock according to claim 12, characterized in that, The liquid supply port of the lock body corresponding to one of the hydraulic control check valve assemblies is connected to the valve core pressure control port corresponding to another of the hydraulic control check valve assemblies through a first internal channel.

14. The differential bidirectional lock according to claim 13, characterized in that, The first lock body working port and the second lock body working port are located between the first lock body liquid supply port and the second lock body liquid supply port. The first lock body liquid supply port and the first lock body working port are offset from each other.

15. The differential bidirectional lock according to claim 14, characterized in that, A lock body pressure control port is provided on the first surface of the lock body. The lock body pressure control port is directly connected to the return fluid and communicates with the push rod cavity in each of the hydraulic control check valve assemblies through a second internal channel, so that the push rod cavity is kept in a low pressure state.

16. The differential bidirectional lock according to claim 15, characterized in that, The lock body is also provided with a liquid outlet, which is correspondingly provided with the hydraulic control check valve assembly, and a plug is provided inside the liquid outlet.

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