Bidirectional lock

Abstract

The bidirectional lock comprises a valve body and a valve element assembly arranged in the valve body, the valve element assembly comprises a liquid inlet valve sleeve, a plug sleeve, a large valve element, a small valve element, an ejector rod and a first spring exerting elastic acting force on the small valve element, a first center hole is formed in the large valve element, and the small valve element comprises a first guide section inserted into the first center hole; the first guide section is a cylinder, the outer diameter of the first guide section is the same as the diameter of the first center hole, and a first liquid passing channel used for guiding liquid in the ejector rod into the plug sleeve is arranged in the first guide section. According to the bidirectional lock, no gap exists between the outer circle face of the first guide section of the small valve element and the inner circle face of the large valve element, the small valve element cannot deflect in the moving process, the first spring is not prone to lateral bending or pressing breakage, reliability is improved, liquid inlet is even, and the small valve element is easy to machine.

Description

Technical Field

[0001] The invention belongs to the technical field of fully-mechanized coal mining hydraulic supports in coal mines. Specifically, the utility model relates to a two-way lock. Background Art

[0002] Hydraulic supports are important machinery in coal mining operations. Hydraulic supports mainly rely on columns to support the roof beam, so that the support body of the support presses tightly against the roof. When the hydraulic support needs to be moved, the column is controlled to descend through the hydraulic system, so that the roof beam leaves the roof, and then the hydraulic support moves to a new position.

[0003] The two-way lock is mainly used in coal mine hydraulic supports and jointly controls the balance of the hydraulic support with the control valve group to protect and assist the action of the rib protection jack. When the control valve group is in the neutral position and the result of the external force action does not reach the opening pressure of the safety valve, it can keep the jack in a certain working state for a long time, so that the hydraulic support plays its due support role under the action of external forces.

[0004] Chinese Patent No. 201520138130.1 discloses a rib protection two-way lock, which includes a valve body, a first spool assembly and a second spool assembly. The valve seats of the two spool assemblies are provided with unloading cavities. The head of the ejector rod extends into the unloading cavity of the valve seat. A return spring is also sleeved on the ejector rod. External threads are provided on the rod body of the head of the ejector rod. A limiting block is provided inside the valve seat near the unloading cavity. A through hole is provided on the limiting block, and internal threads adapted to the external threads on the ejector rod are provided on the inner wall of the through hole. One end of the return spring abuts against the limiting block, and the other end abuts against the ejector rod; the head of the spool is hermetically connected to the valve pad provided at the port of the valve seat.

[0005] It is desired to provide an improved two-way lock, especially regarding how to avoid the spring from being skewed during the movement of the small spool and improve the reliability. Summary of the Utility Model

[0006] The invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the utility model provides a two-way lock, aiming to avoid the spring from being skewed during the movement of the small spool and improve the reliability.

[0007] To achieve the above object, the technical solution adopted by the utility model is as follows: a two-way lock, which includes a valve body and a spool assembly provided in the valve body. The spool assembly includes a liquid inlet valve sleeve, a plug sleeve, a large spool, a small spool, an ejector rod and a first spring that applies an elastic force to the small spool. A first central hole is provided in the large spool. The small spool includes a first guiding section inserted into the first central hole. The first guiding section is a cylinder, and the outer diameter of the first guiding section is the same as the diameter of the first central hole. A first liquid passing channel for guiding the liquid in the ejector rod to the plug sleeve is provided in the first guiding section.

[0008] The first liquid passage includes a first liquid hole and a second liquid hole. The first liquid hole communicates with the inner cavity of the liquid inlet valve sleeve, and the second liquid hole communicates with the first liquid hole.

[0009] The first liquid hole extends along the axial direction of the first guiding section, and the second liquid hole extends from the inner circular surface of the first liquid hole to the outer circular surface of the first guiding section.

[0010] A plurality of the second liquid holes are provided.

[0011] A second liquid passage for guiding the liquid in the liquid inlet valve sleeve to the first liquid passage is provided on the ejector rod.

[0012] The second liquid passage includes a third liquid hole and a fourth liquid hole. The third liquid hole communicates with the first liquid passage, and the fourth liquid hole communicates with the inner cavity of the liquid inlet valve sleeve.

[0013] The third liquid hole extends along the axial direction of the ejector rod, and the fourth liquid hole extends from the inner circular surface of the third liquid hole to the outer circular surface of the ejector rod.

[0014] A plurality of the fourth liquid holes are provided.

[0015] The first spring is a rectangular spring.

[0016] A second spring is sleeved on the ejector rod, and the second spring is a cylindrical helical spring.

[0017] For the two-way lock of the present utility model, there is no gap between the outer circular surface of the first guiding section of the small valve core and the inner circular surface of the large valve core. During the movement of the small valve core, there will be no deviation, the first spring is not prone to side bending or breakage, the reliability is improved, the liquid inlet is uniform, and the small valve core is also easy to process. Description of the Drawings

[0018] This specification includes the following drawings, and the shown contents are respectively:

[0019] Figure 1 It is a cross-sectional view of the hydraulic control one-way valve of the present utility model;

[0020] Figure 2 It is a cross-sectional view of the valve core assembly;

[0021] Figure 3 It is a cross-sectional view of the small valve core;

[0022] Figure 4 It is a cross-sectional view of the ejector rod;

[0023] The markings in the figure are: 1. Plug sleeve; 2. Thrust rod; 201. Third liquid passage hole; 202. Fourth liquid passage hole; 3. Second spring; 4. Liquid inlet valve sleeve; 5. Valve seat; 6. Large valve core; 7. Small valve core; 701. First liquid passage hole; 702. Second liquid passage hole; 703. First guiding section; 704. Second guiding section; 8. First spring; 9. Valve body. Detailed implementation mode

[0024] The following is a further detailed description of the specific implementation mode of the present utility model by describing the embodiments with reference to the accompanying drawings, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the concept and technical solution of the present utility model and facilitate its implementation.

[0025] It should be noted that in the following implementation modes, the "first", "second", "third" and "fourth" do not represent an absolute distinction relationship in terms of structure and / or function, nor do they represent the execution order of sequence, but are only for the convenience of description.

[0026] As Figure 1 and Figure 2 shown, the present utility model provides a two-way lock with a nominal flow rate of 400 L / min, which can be used for the lifting control of jacks such as rib protection and front beam, or medium-sized columns. The two-way lock includes a valve body 9 and two valve core assemblies arranged in the valve body 9. The two valve core assemblies are arranged in the same valve cavity of the valve body 9. The valve cavity extends from one end face of the valve body 9 to the other end face of the valve body 9 and is arranged through the valve body 9. The two valve core assemblies are coaxially arranged. The valve core assembly includes a plug sleeve 1, a thrust rod 2, a first spring 8, a second spring 3, a large valve core 6 and a small valve core 7 arranged inside the plug sleeve 1, a liquid inlet valve sleeve 4 sleeved on the thrust rod 2 and located between the screw sleeve and the plug sleeve 1, and a valve seat 5 arranged inside the liquid inlet valve sleeve 4 and used to cooperate with the large valve core 6 to achieve sealing. The plug sleeve 1, the large valve core 6, the small valve core 7, the liquid inlet valve sleeve 4, the valve seat 5, the second spring 3 and the first spring 8 form an inserted valve core assembly. The valve core assembly is an integral structure. The liquid inlet valve sleeve 4 is sleeved on the thrust rod 2. The large valve core 6 and the small valve core 7 are arranged inside the plug sleeve 1. The thrust rod 2 is used to apply an axial pressure to the large valve core 6 and the small valve core 7. The thrust rod 2 can push the large valve core 6 and the small valve core 7 to move towards the inside of the plug sleeve 1, so that the large valve core 6 is separated from the valve seat 5, realizing the opening of the one-way valve. The plug sleeve 1 is threadedly connected to the valve body. The liquid inlet valve sleeve 4 is threadedly connected to one end of the plug sleeve 1. The plug sleeve 1 is used to limit the position of the large valve core 6 axially. The valve body is used to connect with an external column jack. The first spring 8 is used to apply an elastic force to the small valve core 7. The large valve core 6 is sleeved on the small valve core 7.

[0027] Specifically, as Figure 2As shown, the head of the large spool 6 is sealingly connected to the valve seat 5. The first spring 8 pushes the small spool 7 to slide in the large spool 6, so that the head of the small spool 7 can extend out of the large spool 6 and first contact the ejector rod 2. The ejector rod 2 moves towards the large spool 6 and the small spool 7 under the push of the emulsion liquid entering the valve body 9 from the working port, first contacts the small spool 7 and pushes the small spool 7 to move. At this time, the unloading amount is small. When the ejector rod 2 moves to contact the large spool 6, it pushes the large spool 6 to move, and the large spool 6 is separated from the valve seat 5. At this time, the unloading amount is large.

[0028] As Figure 2 shown, the head of the large spool 6 is a frustum structure, and the head of the large spool 6 no longer extends into the unloading cavity of the inlet valve sleeve 4. The ejector rod 2 only starts to contact the large spool 6 and the small spool 7 at the central hole of the valve seat 5, making the structure of the spool assembly simpler. In addition, the connection between the large spool 6 and the valve seat 5 is a hard seal connection. The large spool 6, the small spool 7 and the valve seat 5 are all made of 3Cr13 stainless steel with a metal material. Compared with the soft material seal, the hard seal not only has good sealing performance, but also can withstand ultra-high pressure, and can extend the service life of the two-way lock.

[0029] As Figures 1 to 3 shown, the small spool 7 includes a first guiding section 703, a sealing section and a second guiding section 704 arranged in sequence. A first sealing surface is arranged on the sealing section, and a second sealing surface in contact with the first sealing surface is arranged on the large spool 6. The first sealing surface is a conical surface. After the first sealing surface contacts the second sealing surface, the two-way lock is closed. The first guiding section 703, the sealing section and the second guiding section 704 are coaxially fixedly connected. The first guiding section 703 and the second guiding section 704 are cylinders. The maximum outer diameter of the sealing section is greater than the outer diameters of the first guiding section 703 and the second guiding section 704. A first central hole and a second central hole are arranged in the large spool 6. The first central hole and the second central hole are coaxially arranged. The first central hole and the second central hole are communicated and the diameter of the first central hole is smaller than the diameter of the second central hole. The first guiding section 703 is inserted into the first central hole. The sealing section and the second guiding section 704 are located in the second central hole. The diameter of the second central hole is greater than the outer diameters of the sealing section and the second guiding section 704. The outer diameter of the first guiding section 703 is the same as the diameter of the first central hole. The outer circular surface of the large spool 6 contacts the inner circular surface of the plug sleeve 1. The plug sleeve 1 plays a guiding role for the large spool 6. The inner circular surface of the plug sleeve 1 is a cylindrical surface with a constant diameter along the axial direction. The outer circular surface of the first guiding section 703 is a cylindrical surface with a constant diameter along the axial direction. The outer diameter of the first guiding section 703 is the same as the diameter of the first central hole. A first liquid passing channel is arranged in the first guiding section 703 for guiding the liquid entering the ejector rod 2 from the inlet valve sleeve 4 to the plug sleeve 1.

[0030] As Figure 2 and Figure 3As shown, the first liquid passage includes a first liquid hole 701 and a second liquid hole 702. The first liquid hole 701 communicates with the inner cavity of the liquid inlet valve sleeve 4, and the second liquid hole 702 communicates with the first liquid hole 701. The first liquid hole 701 extends axially along the first guiding section 703 from the end face of the first guiding section 703 facing the ejector rod 2 into the interior of the first guiding section 703. The first liquid hole 701 is a circular hole provided at the center of the first guiding section 703. The second liquid hole 702 extends from the inner circular surface of the first liquid hole 701 to the outer circular surface of the first guiding section 703, and the second liquid hole 702 extends radially along the first guiding section 703. A plurality of second liquid holes 702 are provided, and all the second liquid holes 702 are evenly distributed circumferentially with the axis of the first liquid hole 701 as the center line.

[0031] As Figures 1 to 4 shown, an ejector rod 2 is provided with a second liquid passage for guiding the liquid in the liquid inlet valve sleeve 4 to the first liquid passage. The second liquid passage includes a third liquid hole 201 and a fourth liquid hole 202. The third liquid hole 201 communicates with the first liquid passage, and the fourth liquid hole 202 communicates with the inner cavity of the liquid inlet valve sleeve 4. The third liquid hole 201 extends axially along the ejector rod 2 from the end face of the ejector rod 2 facing the small valve core 7 into the interior of the ejector rod 2. The third liquid hole 201 is located at the center of the ejector rod 2, and the third liquid hole 201 and the first liquid hole 701 are coaxially arranged. The fourth liquid hole 202 extends from the inner circular surface of the third liquid hole 201 to the outer circular surface of the ejector rod 2, and the fourth liquid hole 202 extends radially along the ejector rod 2. A plurality of fourth liquid holes 202 are provided, and all the fourth liquid holes 202 are evenly distributed circumferentially with the axis of the third liquid hole 201 as the center line.

[0032] The fourth liquid hole 202 is used to guide the liquid entering the inner cavity of the liquid inlet valve sleeve 4 into the third liquid hole 201. After the end face of the ejector rod 2 contacts the small valve core 7, the small valve core 7 is pushed to move, so that the small valve core 7 is separated from the large valve core 6. The liquid in the third liquid hole 201 enters the first liquid hole 701 and then flows into the inner cavity of the plug sleeve 1 through the second liquid hole 702. With this structure, there is no gap between the outer circular surface of the first guiding section 703 of the small valve core 7 and the inner circular surface of the large valve core 6. The small valve core 7 will not be deflected during the movement process, and the first spring 8 is not prone to side bending or breakage, improving the reliability, ensuring uniform liquid inlet, and the small valve core 7 is also easy to process.

[0033] As Figure 1 and Figure 2As shown, one end of the first spring 8 is located in the inner cavity of the second guiding section 704, and the other end of the first spring 8 is located in the positioning groove provided on the inner wall surface of the plug sleeve 1. The first spring 8 is a rectangular spring and a compression spring. Under the same space conditions, a rectangular cross-section has a greater stiffness and a smaller volume than a helical compression spring, which can reduce the occupied space, ensure the timely closing of the two-way lock, and improve the working reliability.

[0034] The second guiding section 704 is located in the second central hole of the large spool 6. The length of the second guiding section 704 is less than the length of the second central hole. After the ejector rod 2 pushes the small spool 7 to move to the limit position, the first spring 8 is in a compressed state and the length of the first spring 8 at this time is less than the spool space. The distance between the second guiding section 704 and the inner wall surface of the plug sleeve 1 is small, and the first spring 8 will not tilt or be crushed.

[0035] As Figure 1 and Figure 2 shown, the second spring 3 is used to apply an elastic force to the ejector rod 2 to move it towards a position away from the small spool 7. The second spring 3 is sandwiched between the limiting surface provided in the liquid inlet valve sleeve 4 and the step surface provided on the ejector rod 2. The second spring 3 is a cylindrical helical spring and a compression spring.

[0036] As Figure 2 and Figure 4 shown, the head rod body of the ejector rod 2 is provided with an external thread. A limiting block is provided at a position inside the liquid inlet valve sleeve 4 adjacent to the unloading cavity. The limiting block is provided with a through hole, and the inner wall of the through hole is provided with an internal thread adapted to the external thread on the ejector rod 2. A sealing ring is provided between the ejector rod 2 and the limiting block. An annular sealing groove for accommodating the sealing ring is provided on the inner circular surface of the limiting block. The external thread provided on the ejector rod 2 is a rectangular thread, which can prevent the external thread from damaging the sealing ring when installing the ejector rod 2 and ensure the sealing effect. The liquid inlet valve sleeve 4 and the ejector rod 2 are threadedly connected. The ejector rod 2 can be screwed into the unloading cavity in the liquid inlet valve sleeve 4 to form an inserted spool assembly, which makes the system integration degree of the entire two-way lock relatively high, facilitates the installation and maintenance of the two-way lock, that is, the installation is simple and the maintenance is convenient, and the two-way lock can be repaired directly by replacing the inserted spool assembly.

[0037] The above has made an exemplary description of the present invention in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above concept and technical solution of the present invention are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims

1. A two-way lock, comprising a valve body and a valve core assembly arranged in the valve body, wherein the valve core assembly comprises a liquid inlet valve sleeve, a screw plug sleeve, a large valve core, a small valve core, a push rod and a first spring exerting an elastic force on the small valve core, a first center hole is arranged in the large valve core, and the small valve core comprises a first guide section inserted into the first center hole, characterized in that: The first guide section is a cylinder, the outer diameter of which is the same as the diameter of the first center hole, and a first liquid passage is provided in the first guide section for guiding the liquid in the push rod to the screw plug sleeve.

2. The two-way lock according to claim 1, characterized in that: The first liquid passage includes a first liquid passage hole and a second liquid passage hole. The first liquid passage hole is communicated with the inner cavity of the liquid inlet valve sleeve, and the second liquid passage hole is communicated with the first liquid passage hole.

3. The two-way lock according to claim 2, characterized in that: The first liquid-passing hole extends along the axial direction of the first guide section, and the second liquid-passing hole extends from the inner circumferential surface of the first liquid-passing hole to the outer circumferential surface of the first guide section.

4. The two-way lock according to claim 2, characterized in that: A plurality of the second liquid passage holes are provided.

5. The two-way lock according to any one of claims 1 to 4, characterized in that: The push rod is provided with a second liquid passage for guiding the liquid in the liquid inlet valve sleeve to the first liquid passage.

6. The two-way lock according to claim 5, characterized in that: The second liquid passage includes a third liquid passage hole and a fourth liquid passage hole. The third liquid passage hole is communicated with the first liquid passage, and the fourth liquid passage hole is communicated with the inner cavity of the liquid inlet valve sleeve.

7. The two-way lock according to claim 6, characterized in that: The third liquid passage hole extends along the axial direction of the push rod, and the fourth liquid passage hole extends from the inner circumferential surface of the third liquid passage hole to the outer circumferential surface of the push rod.

8. The two-way lock according to claim 6, characterized in that: The fourth liquid passage holes are provided in plurality.

9. The two-way lock according to any one of claims 1 to 4, characterized in that: The first spring is a rectangular spring.

10. The two-way lock according to any one of claims 1 to 4, characterized in that: A second spring is sleeved on the push rod, and the second spring is a cylindrical helical spring.

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