A spool structure and its speed lock

Abstract

The present application relates to a spool structure and its speed lock, which includes: a valve body and a sliding component. A sealed cavity is formed inside the valve body, and two groups of flow holes communicating with the sealed cavity are provided on the surface of the valve body; the sliding component includes a plunger body, which is slidably connected in the sealed cavity and divides the sealed cavity into two damping medium accommodation spaces. The two damping medium accommodation spaces are communicated through a flow passage on the plunger body. The movement direction of the plunger body is the same as the axial extension direction of the sealed cavity. The length of the plunger body is less than the distance between the two groups of flow holes, and the length of the plunger body is greater than the diameter of the flow hole; the plunger body has a first position and a second position. When in the first position, the plunger body is located between the two groups of flow holes; when in the second position, the plunger body seals one of the groups of flow holes. Under the action of an external force, one of the groups of flow holes on the surface of the valve body is completely blocked by the plunger body, and the pressure will not leak internally, making the locking state of the speed lock stable.

Description

Technical Field

[0001] This application relates to the field of speed lockers, and particularly to a spool structure and its speed locker. Background Art

[0002] Bridge engineering is the throat of transportation. How to protect the safety of bridge structures and improve the service life of bridge structures has attracted more and more attention from scholars and experts. For simply supported beam bridges, a fixed pier is set at one end of each beam, a fixed bearing is installed, and a movable pier is set at the other end, and a movable bearing is installed. When subjected to loads such as earthquakes, wind loads, and vehicle loads, the movable bearing slides freely and cannot bear the load, and all the loads are borne by the fixed bearing on the fixed pier. In order to give full play to the bearing capacity of the movable pier and at the same time reduce the bearing burden of the fixed pier, a bridge structure protection device - a speed locker is adopted.

[0003] The speed locker is combined with the movable bearing to form a speed-locked bearing. In the "slow" working conditions such as temperature deformation, the reaction force of the speed locker is very small, and the bearing is equivalent to a sliding bearing, which does not affect the normal displacement between structural components. In the "fast" working conditions, the reaction force of the speed locker is very large, and the bearing is equivalent to a fixed bearing. The movable pier temporarily becomes a fixed pier and can share the external load and jointly bear the force with the fixed pier.

[0004] Traditional speed lockers use oil as a filling medium, set an installation hole inside the piston rod, and rely on the seal inside the installation hole to seal the end of the installation hole to achieve the function of speed locking. The seal includes a spring and a seal block. When there is a pressure difference on both sides of the piston rod, the spring compresses and drives the seal block to block and seal one end of the installation hole, thereby locking the speed locker. When controlling the seal block to seal the installation hole through the spring, there will be a gap between the coils of the spring when the spring compresses, which will cause the seal block to not completely seal the end of the installation hole, resulting in internal leakage of the gap pressure and causing the locking state of the speed locker to be unstable and unreliable. Summary of the Invention

[0005] The embodiments of this application provide a spool structure and its speed locker to solve the problem that the locking state of the traditional speed locker in the related technology is unstable and unreliable.

[0006] To achieve the above object, the present invention provides the following technical solutions: In a first aspect, a spool structure is provided, which includes: a valve body and a sliding assembly. A sealing cavity is formed inside the valve body, and two sets of flow holes communicating with the sealing cavity are provided on the surface of the valve body; the sliding assembly includes a plunger body, the plunger body is slidably connected in the sealing cavity, and divides the sealing cavity into two damping medium accommodating spaces. The two damping medium accommodating spaces are communicated through a flow passage on the plunger body. The moving direction of the plunger body is the same as the axial extension direction of the sealing cavity. The length of the plunger body is less than the distance between the two sets of flow holes, and the length of the plunger body is greater than the diameter of the flow hole; the plunger body has a first position and a second position. When in the first position, the plunger body is located between the two sets of flow holes; when in the second position, the plunger body seals one of the sets of flow holes.

[0007] In some embodiments, the sliding assembly further includes: two connecting rods and two elastic members. The two connecting rods are respectively arranged at both ends of the plunger body, and the two connecting rods respectively pass through both ends of the valve body and are slidably connected to the valve body; the two elastic members are respectively fixed at both ends of the plunger body, and one end of each elastic member is fixed to the valve body. The telescopic direction of the elastic member is the same as the moving direction of the sliding assembly.

[0008] In some embodiments, the elastic member includes a return spring, and the return spring is sleeved on the surface of the connecting rod.

[0009] In some embodiments, the valve body includes a sleeve, both ends of the sleeve are open, and valve covers are detachably connected to both ends of the sleeve; a sealing cavity is formed between the sleeve and the valve covers.

[0010] In some embodiments, the sleeve is used to be connected to the installation hole in the piston, and an installation groove is provided in the middle of the surface of the sleeve.

[0011] In some embodiments, a leak-proof member is installed in the installation groove, and the surface of the leak-proof member is used to fit with the inner wall of the installation hole in the piston.

[0012] In some embodiments, the flow hole is used to communicate the cavity in the master cylinder body and the damping medium accommodating space.

[0013] In some embodiments, along the circumferential direction of the sleeve, a boss is provided on the surface of the sleeve, and the valve cover is detachably connected to the boss through a fixing member.

[0014] In a second aspect, a speed lock is provided, which includes: the spool structure as described above.

[0015] The beneficial effects brought by the technical solutions provided in this application include:

[0016] The embodiment of the present application provides a spool structure and its speed lock. An overflow hole is opened on the surface of the valve body. The plunger body serves as a seal for blocking the overflow hole, and the length of the plunger body is greater than the diameter of the overflow hole. Under the action of an external force, one set of overflow holes on the surface of the valve body is completely blocked by the plunger body, and the damping medium cannot flow from one side of the spool structure to the other side, and the pressure will not leak internally, making the locking state of the speed lock stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic structural diagram of the first state of the spool structure provided by the embodiment of the present application;

[0019] Figure 2 Schematic structural diagram of the second state of the spool structure provided by the embodiment of the present application;

[0020] Figure 3 Schematic structural diagram of the sleeve provided by the embodiment of the present application.

[0021] In the figure: 1. Valve body; 10. Sleeve; 100. Boss; 101. Installation groove; 102. Overflow hole; 11. Valve cover; 12. Fixing member; 13. Damping medium accommodation space;

[0022] 2. Piston; 20. Plunger body; 21. Overflow channel; 22. Connecting rod; 23. Elastic member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0024] See Figures 1 to 3 , the embodiment of the present application provides a spool structure and its speed lock, which can solve the problems of insensitivity and slow response of traditional speed locks in related technologies.

[0025] In a first aspect, an embodiment of the present application provides a valve core structure, which includes: a valve body 1 and a sliding component 2. A sealing cavity is formed inside the valve body 1, and two groups of flow-through holes 102 communicating with the sealing cavity are provided on the surface of the valve body 1; the sliding component 2 includes a plunger body 20, and the plunger body 20 is slidably connected inside the sealing cavity and divides the sealing cavity into two damping medium accommodation spaces 13. The two damping medium accommodation spaces 13 are communicated through a flow-through channel 21 on the plunger body 20. The moving direction of the plunger body 20 is the same as the axial extension direction of the sealing cavity. The length of the plunger body 20 is less than the distance between the two groups of flow-through holes 102, and the length of the plunger body 20 is greater than the diameter of the flow-through hole 102; the plunger body 20 has a first position and a second position, and when in the first position, the plunger body 20 is located between the two groups of flow-through holes 102; when in the second position, the plunger body 20 seals one group of the flow-through holes 102.

[0026] In the present application, the flow-through holes 102 are provided on the surface of the valve body 1. The plunger body 20 is used as a seal for blocking the flow-through holes 102, and the length of the plunger body 20 is greater than the diameter of the flow-through hole 102. Under the action of an external force, when the sliding component moves inside the sealing cavity, one group of the flow-through holes 102 on the surface of the valve body 1 is directly sealed by the plunger body 20, and one group of the flow-through holes 102 on the surface of the valve body 1 is completely blocked by the plunger body 20. The damping medium cannot flow from one side of the valve core structure to the other side, and the pressure will not leak internally, making the locking state of the speed lock stable and reliable.

[0027] When it is necessary to adjust the locking speed, only the number and aperture size of the flow-through holes 102 need to be changed, without changing the overall structure of the valve core structure.

[0028] When the plunger body 20 is in the first position, the plunger body 20 is located between the two groups of flow-through holes 102. At this time, the damping medium flows into the inside of the valve body 1 from one group of flow-through holes 102 and then flows out from the other group of flow-through holes 102, and the damping medium can flow freely.

[0029] The initial position of the plunger body 20 is in the middle inside the valve body 1, that is, the plunger body 20 is in the first position. The plunger body 20 divides the inside of the valve body 1 into left and right two damping medium accommodation spaces 13. The left and right two damping medium accommodation spaces 13 are communicated through the flow-through channel 21. The movement of the plunger body 20 is controlled by the pressure difference on both sides outside the valve core structure. When the plunger body 20 is in the second position, the plunger body 20 seals one group of the flow-through holes 102, thereby controlling the opening and closing of one group of the flow-through holes 102 among the two groups of flow-through holes 102. When one group of the flow-through holes 102 is sealed, the speed lock is locked.

[0030] Since different bridge locking speed requirements are different, the number and aperture size of the flow-through holes 102 can be set according to the bridge locking speed requirements.

[0031] The valve body 1 includes a sleeve 10 with both ends open, and valve covers 11 are detachably connected to both ends of the sleeve 10.

[0032] A sealed cavity is formed between the sleeve 10 and the valve cover 11. By setting the sleeve 10 and the valve cover 11 to be detachably connected, it is convenient to repair and replace parts of the device. The sleeve 10 and the valve cover 11 are connected by a fixing member 12. Specifically, along the circumferential direction of the sleeve 10, a boss 100 is provided on the surface of the sleeve 10, and the valve cover 11 is detachably connected to the boss 100 through the fixing member 12. When the fixing member 12 is a bolt, a threaded hole is opened on the boss 100, and a threaded hole corresponding to the position of the boss 100 also needs to be opened on the valve cover 11. The threaded hole on the boss 100 and the threaded hole on the valve cover 11 are threadedly connected to the bolt.

[0033] The sleeve 10 is arranged in the installation hole in the piston and is connected to the installation hole. The piston is arranged in the main cylinder body. The piston divides the main cylinder body into two cavities. An installation groove 101 is provided in the middle of the surface of the sleeve 10. The surface of the installation groove 101 is used to fit with the inner wall of the installation hole in the piston. A leak-proof member is installed in the installation groove 101. The surface of the leak-proof member is used to connect with the inner wall of the main cylinder body. By setting the leak-proof member, it is prevented that the damping medium flows through the gap between the installation groove 101 and the inner wall of the installation hole. The leak-proof member can be made of rubber.

[0034] The boss 100 can be in contact with the inner wall of the installation hole. Since the bosses 100 are arranged at intervals on the sleeve 10, the damping medium inside the cavity can enter the damping medium accommodation space 13 through the gaps between the multiple bosses 100 and then through the flow holes 102. Therefore, the flow holes 102 connect the cavity on the same side of the plunger body 20 and the damping medium accommodation space 13. When the plunger body 20 is in the first position, the plunger body 20 is located between two groups of flow holes 102. At this time, the damping medium flows into the valve body 1 from one group of flow holes 102 and flows out from the other group of flow holes 102. The damping medium can freely flow inside the main cylinder body.

[0035] On the basis of the above embodiments, in this embodiment, the sliding assembly 2 further includes: two connecting rods 22 and two elastic members 23. The two connecting rods 22 are respectively arranged at both ends of the plunger body 20. The two connecting rods 22 respectively pass through both ends of the valve body 1 and are slidably connected to the valve body 1. The two connecting rods 22 are respectively located in the middle of both ends of the plunger body 20, that is, the extending direction of the central axis length of the connecting rod 22 overlaps with the extending direction of the central axis length of the plunger body 20; the two elastic members 23 are respectively fixed at both ends of the plunger body 20. One end of each elastic member 23 is fixed to the valve body 1. The telescopic direction of the elastic member 23 is the same as the moving direction of the sliding assembly 2. Specifically, the elastic member 23 includes a return spring, and the return spring is sleeved on the surface of the connecting rod 22.

[0036] In the prior art, when the speed lock is locked, the mounting hole on the piston is sealed by a seal. Therefore, it is necessary to set the diameter of one end of the seal to be the same as the diameter of the mounting hole. When there is a large pressure difference on both sides of the valve core structure, one end of the seal is the pressure-receiving part. In the present application, the valve body 1 is arranged in the mounting hole in the piston, and the flow-through hole 102 is opened on the surface of the valve body 1. When the speed lock is locked, the flow-through hole 102 needs to be blocked by the plunger body 20. The end face area of the connecting rod 22 in the present application is smaller than the area of the radial section of the mounting hole. Therefore, when there is a large pressure difference on both sides of the valve core structure, the pressure-receiving part is the end of the connecting rod 22. Compared with the prior art, the area of the pressure-receiving part in the present application is smaller. Under the same pressure difference, the oil pressure received by the connecting rod 22 and the plunger body 20 is small, and the required stiffness of the return spring is also correspondingly reduced. The smaller the stiffness of the return spring, the higher the sensitivity of the valve core structure.

[0037] Both ends of the sleeve 10 are open. Both connecting rods 22 pass through the valve cover 11 and are slidably connected to the valve cover 11. Both return springs are connected to the inner wall of the valve cover 11.

[0038] When the speed lock is subjected to an external load, a pressure difference will be generated between the left and right sides of the valve core structure. On the side with a large pressure, the damping medium will push the plunger body 20 to move towards the side with a small pressure. The plunger body 20 blocks the flow-through hole 102 on the side with a small pressure. At this time, the plunger body 20 is located at the second position. At the same time, the plunger body 20 compresses the elastic member 23 on the side with a small pressure. When the flow-through hole 102 on this side is blocked, the speed lock is immediately locked. When the external load disappears, the pressure difference between the left and right sides of the valve core structure also disappears. The compressed elastic member 23 will automatically rebound and push the plunger body 20 back to the first position, and the speed lock is unlocked.

[0039] When the speed lock is only affected by temperature deformation, a small pressure difference will be generated between the left and right sides of the valve core structure. On the side with a large pressure, the damping medium pushes the plunger body 20 to move a small displacement towards the side with a small pressure. The middle cylinder of the plunger body 20 will not completely block the flow-through hole 102, and the speed lock will not be locked. At the same time, the plunger body 20 compresses the elastic member 23 on this side. When the load generated by the temperature deformation disappears, the pressure difference between the left and right sides of the valve core structure also disappears. The compressed elastic member 23 will automatically rebound and push the plunger body 20 back to the initial position.

[0040] So that this structure can release displacement under "slow" working conditions such as temperature deformation, without generating a large acting force and without affecting the normal displacement between the bridge structural members; under "fast" working conditions, that is, when the speed lock is subjected to an external load, the valve core structure responds quickly and locks quickly, ensuring the locking performance of the speed lock, thereby ensuring the safety of the bridge structure and improving the service life of the bridge structure.

[0041] In a second aspect, embodiments of the present application provide a speed lock, which includes the spool structure provided in any of the above embodiments of the present application. Embodiments of the present application do not limit the specific structure of the speed lock.

[0042] In the present application, a flow hole 102 is formed on the surface of the valve body 1. The plunger body 20 is used as a seal for blocking the flow hole 102, and the length of the plunger body 20 is greater than the diameter of the flow hole 102. Under the action of an external force, when the sliding assembly moves in the sealing cavity, it directly seals one group of flow holes 102 on the surface of the valve body 1 through the plunger body 20. One group of flow holes 102 on the surface of the valve body 1 is completely blocked by the plunger body 20, and the damping medium cannot flow from one side of the spool structure to the other side, so that the pressure will not leak internally, making the locked state of the speed lock stable and reliable.

[0043] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. Unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0044] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0045] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A spool structure, characterized in that, It includes: A valve body (1), a sealed cavity is formed inside the valve body (1), and two groups of flow holes (102) communicating with the sealed cavity are formed on the surface of the valve body (1); A sliding assembly (2), the sliding assembly (2) includes a plunger body (20), the plunger body (20) is slidably connected in the sealed cavity, and divides the sealed cavity into two damping medium accommodating spaces (13), the two damping medium accommodating spaces (13) are communicated through a flow passage (21) on the plunger body (20), the moving direction of the plunger body (20) is the same as the axial extension direction of the sealed cavity, the length of the plunger body (20) is less than the distance between the two groups of flow holes (102), and the length of the plunger body (20) is greater than the diameter of the flow hole (102); The plunger body (20) has a first position and a second position, and when in the first position, the plunger body (20) is located between the two groups of flow holes (102); when in the second position, the plunger body (20) seals one of the groups of flow holes (102); The sliding assembly (2) includes two elastic members (23), the two elastic members (23) are respectively fixed at both ends of the plunger body (20), one end of each elastic member (23) is fixed to the valve body (1), and the telescopic direction of the elastic member (23) is the same as the moving direction of the sliding assembly (2); The valve body (1) includes a sleeve (10), both ends of the sleeve (10) are open, and valve covers (11) are detachably connected to both ends of the sleeve (10); A sealed cavity is formed between the sleeve (10) and the valve cover (11); The sleeve (10) is used to connect with the installation hole in the piston, and an installation groove (101) is arranged in the middle of the surface of the sleeve (10); An anti-leakage member is installed in the installation groove (101), and the surface of the anti-leakage member is used to fit with the inner wall of the installation hole in the piston; The flow hole (102) is used to communicate the cavity in the master cylinder and the damping medium accommodating space (13).

2. The valve core structure according to claim 1, characterized in that, The sliding assembly (2) further includes: Two connecting rods (22), the two connecting rods (22) are respectively arranged at both ends of the plunger body (20), and the two connecting rods (22) respectively pass through both ends of the valve body (1) and are slidably connected to the valve body (1).

3. The spool structure according to claim 2, wherein: The elastic member (23) includes a return spring, and the return spring is sleeved on the surface of the connecting rod (22).

4. The spool structure according to claim 1, wherein: Along the circumferential direction of the sleeve (10), a boss (100) is arranged on the surface of the sleeve (10), and the valve cover (11) is detachably connected to the boss (100) through a fixing member (12).

5. A speed locker, characterized in that, It includes: The spool structure according to any one of claims 1-4.

Images