Adjustable threaded plug-in anti-swing valve and hydraulic motor

Abstract

The utility model relates to an anti-swing valve, and provides an adjustable threaded plug-in anti-swing valve and a hydraulic motor in order to solve the problem that an existing threaded plug-in anti-swing valve is inconvenient in pressure regulation. The valve body is provided with an installation external thread, the pressure balance mechanism is installed in a matching inner hole of the valve body and used for unloading and intercommunicating of a port A and a port B, the sealing screw plug is installed in the outer end of the matching inner hole, and the inner end of the sealing screw plug abuts against a plunger in the pressure balance mechanism; in addition, the check valve further comprises a locking nut, an inner section thread and an outer section thread are arranged on the outer circle face of the sealing plug screw, the inner section thread is matched with the inner thread of the matching inner hole, the locking nut is located outside the valve body, matched with the outer section thread and connected with the valve body in an abutting mode, and a sealing ring is arranged between the sealing plug screw and the hole wall of the matching inner hole. According to the anti-swing valve, pressure on-line adjustment is involved, operation is easy, stepless adjustment can be achieved, and the adjusting precision is high.

Description

Technical Field

[0001] The utility model relates to an anti-sway valve, and more specifically, to an adjustable threaded cartridge anti-sway valve and a hydraulic motor. Background Art

[0002] During the braking process of the hydraulic swing motor of rotary equipment such as excavators and cranes, due to the pressure shock and pressure fluctuation caused by inertia, the hydraulic motor will instantaneously perform positive and negative alternating actions. This instantaneous positive and negative alternating rotation will cause fluctuations in the hydraulic system. To cope with such fluctuations in the hydraulic system, it is necessary to arrange and install an anti-sway valve in the hydraulic system.

[0003] Chinese patent document CN204458609U discloses a threaded cartridge anti-sway valve. The anti-sway valve includes a valve body, a sealing plug screwed to one end of the valve body. In the four-stage mating inner hole of the valve body, a plunger, a control piston, a steel ball, a control valve core, a valve core return spring, a piston return spring, a pressure regulating washer, etc. are installed. In this technical solution, the position between the sealing plug and the valve body is relatively fixed and non-adjustable. The anti-sway valve adjusts the pre-compression amount of the piston return spring by the thickness of the pressure regulating washer to adjust the intervention pressure. This adjustment method is to select a pressure regulating washer with a suitable thickness and install it between the end of the piston return spring and the control piston. This adjustment method cannot be adjusted online. It is necessary to stop the rotary equipment and relieve the pressure of the hydraulic system, and it is necessary to remove components such as the sealing plug and the control piston. The pressure regulating efficiency is low; in addition, replacing the pressure regulating washer cannot achieve stepless adjustment, and the adjustment accuracy is poor. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is the inconvenient pressure regulation of the existing threaded cartridge anti-sway valve, and an adjustable threaded cartridge anti-sway valve and a hydraulic motor are provided to achieve high-precision and high-efficiency pressure regulation.

[0005] The technical solution for the utility model to achieve its purpose is: an adjustable threaded cartridge anti-sway valve, including a valve body provided with an external thread for installation, a pressure balance mechanism installed in the mating inner hole of the valve body for unloading and communicating the A port and the B port, and a sealing plug installed at the outer end of the mating inner hole. The inner end of the sealing plug abuts against the plunger in the pressure balance mechanism; in addition, a lock nut is further included. The outer cylindrical surface of the sealing plug is provided with an inner section thread and an outer section thread. The inner section thread is matched with the inner thread of the mating inner hole. The lock nut is located outside the valve body and is matched with the outer section thread and abuts against the valve body. A sealing ring is provided between the sealing plug and the inner wall of the mating inner hole.

[0006] In the adjustable threaded cartridge anti-sway valve of the utility model, the sealing ring is sleeved between the inner section thread and the outer section thread.

[0007] In the adjustable threaded plug-in anti-sway valve of the present utility model, a sealing groove for accommodating the sealing ring is provided on the sealing plug.

[0008] In the adjustable threaded plug-in anti-sway valve of the present utility model, the plug connection inner hole section for connecting with the sealing plug in the mating inner hole is a stepped hole, and the small-diameter section is located inside the large-diameter section. The internal thread for mating with the internal section is provided on the small-diameter section of the plug connection inner hole section.

[0009] In the adjustable threaded plug-in anti-sway valve of the present utility model, the large-diameter section of the plug connection inner hole section is a smooth hole section.

[0010] In the adjustable threaded plug-in anti-sway valve of the present utility model, the large-diameter section of the plug connection inner hole section has a threaded section for mating with the external thread and a smooth hole section for mating with the sealing ring.

[0011] In the adjustable threaded plug-in anti-sway valve of the present utility model, an internal hexagonal installation process hole is provided at the outer end of the sealing plug.

[0012] In the adjustable threaded plug-in anti-sway valve of the present utility model, the pressure balance mechanism further includes a control piston and a control valve core axially arranged in sequence in the mating inner hole, a steel ball arranged in the steel ball accommodating cavity formed at the end of the control piston and the control valve core, a piston return spring with both ends respectively abutted against the control piston and the valve body, and a valve core return spring axially abutting against the control valve core; a valve core oil passage communicating the port A with the steel ball accommodating cavity is provided in the control valve core; the plunger is located in the chamber of the control piston, and a piston oil passage communicating the steel ball accommodating cavity and the end chamber of the plunger is provided in the control piston. The control valve core and the valve body form a valve core damping cavity in the mating inner hole, and a valve core damping channel communicating the valve core damping cavity with the outside is provided on the valve body; a balance oil passage communicating the port B with the control piston accommodating cavity is provided in the valve body.

[0013] In the adjustable threaded plug-in anti-sway valve of the present utility model, the balance oil passage includes a piston balance oil passage communicating the port B with the piston return spring accommodating cavity and an oil drain passage communicating the end chamber of the piston with the port B; the end chamber of the piston is located at the end of the control piston adjacent to the control valve core.

[0014] The technical solution adopted by the present utility model to achieve its purpose is as follows: A hydraulic motor includes a mounting base, on which a first anti-sway valve and a second anti-sway valve are mounted. Both the first anti-sway valve and the second anti-sway valve are composed of the aforementioned adjustable threaded inserted anti-sway valve. The A port and B port of the first anti-sway valve communicate with the first working oil port and the second working oil port respectively within the mounting base, and the A port and B port of the second anti-sway valve communicate with the second working oil port and the first working oil port respectively within the mounting base. The first working oil port and the second working oil port are used for the entry of working pressure oil and the return of hydraulic oil when the hydraulic motor rotates and operates.

[0015] Compared with the prior art, in the present utility model, the sealing plug is locked by a locking nut. By rotating the sealing plug, the length of the sealing plug screwed into the mating inner hole can be adjusted, thereby adjusting the pre-compression amount of the piston return spring through the plunger and the control piston, and further adjusting the pressure regulation for the anti-sway valve to intervene. The anti-sway valve can adjust the intervention pressure online without shutting down the machine equipment where it is located; in addition, the adjustment only requires rotating the sealing plug without removing components, and the operation is simple; moreover, the sealing plug can achieve stepless adjustment with high adjustment accuracy. Brief Description of the Drawings

[0016] Figure 1 is a schematic structural view of the adjustable threaded inserted anti-sway valve of the present utility model.

[0017] Figure 2 is a partial enlarged view of the installation position of the sealing plug in the adjustable threaded inserted anti-sway valve of the present utility model.

[0018] Figure 3 is a schematic structural view of the sealing plug in the adjustable threaded inserted anti-sway valve of the present utility model.

[0019] Figure 4 is a schematic installation view of the adjustable threaded inserted anti-sway valve of the utility model on the mounting base.

[0020] Names and serial numbers of components in the figure:

[0021] Valve body 10, plug connection inner hole section 11, small diameter section 12, large diameter section 13.

[0022] Sealing plug 20, inner section thread 21, outer section thread 22, sealing groove 23, plug connection inner hole section 24.

[0023] Locking nut 30.

[0024] Sealing ring 40.

[0025] Control piston 51, piston return spring 52, plunger 53, control valve spool 54, steel ball 55, valve spool return spring 56, plunger end chamber 57, steel ball accommodation chamber 58, valve spool passage 59, valve spool damping chamber 60, valve spool damping passage 61, piston balance oil passage 62, piston return spring accommodation chamber 63, piston oil passage 64, oil drain passage 65, piston end chamber 66.

[0026] Mounting seat 70, first working oil port 71, second working oil port 72

[0027] First anti-sway valve 81, second anti-sway valve 82. Specific implementation mode

[0028] The following describes the specific implementation mode in conjunction with the attached drawings.

[0029] As Figure 1 shown, the adjustable threaded cartridge anti-sway valve includes a valve body 10 provided with an external thread for installation, a pressure balance mechanism installed in the mating inner hole of the valve body 10 for unloading and intercommunication between port A and port B, and a sealing plug 20 installed at the outer end of the mating inner hole. The inner end of the sealing plug 20 abuts against the plunger 53 in the pressure balance mechanism; an inner section thread 21 and an outer section thread 22 are provided on the outer cylindrical surface of the sealing plug 20. The inner section thread 21 is matched with the inner thread of the mating inner hole. The locking nut 30 is located outside the valve body 10 and is matched with the outer section thread 22 and abuts against the valve body 10. A sealing ring 40 is provided between the sealing plug 20 and the wall of the mating inner hole.

[0030] The valve body 10 is generally tubular, and its inner end is provided with an external thread for connecting to the mounting carrier of the anti-sway valve, such as the mounting seat 70 of a hydraulic motor. A pressure balance mechanism is installed in the mating inner hole of the valve body 10, and a sealing plug 20 is installed at the outer end of the mating inner hole of the valve body 10. The sealing plug 20 is used to block the outer end of the mating inner hole and is also used to adjust the intervention pressure.

[0031] As Figure 2 Figure 3 shown, a sealing groove 23 is provided on the outer cylindrical surface of the sealing piston 20 between the inner section thread 21 and the outer section thread 22, and the sealing ring 40 is installed in the sealing groove 23.

[0032] The section of the mating inner hole of the valve body 10 for connecting to the sealing plug 20 is the plug connection inner hole section 11. The plug connection inner hole section 11 is a stepped hole, and its small diameter section 12 is located inside the large diameter section 13. In the plug connection inner hole section 11, an inner thread is provided on its small diameter section 12, and this inner thread is in threaded connection with the inner section thread of the sealing plug 20. The large diameter section 13 of the plug connection inner hole section is a smooth hole section, and this section can cooperate with the sealing ring 40 for sealing.

[0033] In some other embodiments, the large-diameter section 13 of the internal hole section 11 of the plug connection has a threaded section and a smooth hole section, where the threaded section mates with the external thread 22 on the sealing plug 20, and the smooth hole section mates with the sealing ring 40.

[0034] The locking nut 30 is located outside the valve body 10 and mates with the external thread 22 and abuts against the valve body 10. After rotating the locking nut 30 to disengage it from the valve body 10, the sealing plug 20 can be rotated to steplessly adjust the depth of the sealing plug 20 screwed into the valve body, adjust the pre-tightening force of the piston return spring, and achieve the adjustment of the intervention pressure. After the sealing plug 20 is adjusted in place, rotate the locking nut 30 to make it abut against the valve body 10, thereby locking the sealing plug 20 to prevent it from loosening. To facilitate the rotation of the sealing plug 20, an internal hexagonal installation process hole 24 is provided on the end face of the sealing plug 20, and this process hole is used to cooperate with a tool to connect and rotate the sealing plug.

[0035] As Figure 1 shown, the pressure balance mechanism includes a plunger 53, a control piston 51, a control valve core 54, a steel ball 55, a piston return spring 52, a valve core return spring 56, etc.

[0036] The control piston 51 and the control valve core 56 are axially arranged in sequence in the mating inner hole, where the control piston 51 is adjacent to the sealing piston 20. The control piston 51 and the control valve core 56 form a steel ball accommodation cavity 58 at the adjacent end, and the steel ball 55 is located in the steel ball accommodation cavity 58. The piston return spring 52 is sleeved on the control piston 51, one end of which abuts against the control piston 51, and the other end abuts against the valve body 10, and its elastic force is in the direction towards the sealing plug 20.

[0037] A hole is provided in the control piston 51, and the plunger 53 is arranged in this hole, and the outer end of the plunger 53 abuts against the sealing plug 20. The outer cylindrical surface of the plunger 53 is in clearance seal with the wall surface of the hole and forms a plunger end chamber 57 at the inner end of the plunger 53. The inner end of the plunger 53 can abut against the control piston 20. At this time, when the sealing plug 20 rotates, it pushes the plunger 53 to move axially, and the control piston 51 follows the plunger 53 to move and squeeze or release the piston return spring 52, adjusting its pre-tightening force, thereby adjusting the intervention pressure of the anti-sway valve.

[0038] The inner end of the mating inner hole of the valve body 10 is port A, and a valve core oil passage 59 communicating port A with the steel ball accommodation cavity 58 is provided in the control valve core 54. The steel ball 55 is located in the steel ball accommodation cavity 58 and can cooperate with the end of the control valve core 54 to unidirectionally close the valve core oil passage 59.

[0039] The spool return spring 56 is sleeved on the control spool 54. One end of it abuts against the control spool 54, and the other end abuts against the mounting seat 70. The elastic force it provides is directed towards the direction where the control piston 51 is located. The control spool 54 and the valve body 10 form a spool damping cavity 60 that damps the movement of the control spool 54 towards the control piston 51. A damping hole is provided on the valve body 10 to communicate the spool damping cavity 60 with the outside of the valve body. The damping hole and the gap between the valve body 10 and the mounting seat 70 form a spool damping passage 61 that communicates the spool damping cavity 60 with port A.

[0040] The spool return spring ring 56 is sleeved on the control spool 54. One end of it abuts against the control spool 54, and the other end abuts against the mounting seat 70.

[0041] The section of the control piston 51 adjacent to the control spool 54 is in clearance fit and sealed with the mating inner hole, so that the piston return spring accommodation cavity 63 that houses the piston return spring 52 is not communicated with the chamber where the control spool 54 is located. The piston return spring accommodation cavity 63 is communicated with the gap between the end of the control piston 51 and the sealing plug 20.

[0042] A balance oil passage is provided in the valve body 10 to communicate port B with the control piston accommodation cavity. The balance oil passage includes a piston balance oil passage 62 that communicates port B with the piston return spring accommodation cavity 63 and an oil drain passage 65 that communicates the end chamber of the piston with port B; the end chamber of the piston is located at the end of the control piston adjacent to the control spool.

[0043] This embodiment also provides a hydraulic motor. A mounting seat 70 is installed on the housing of the hydraulic motor. A first anti-sway valve 81 and a second anti-sway valve 82 are installed on the mounting seat 70. Both the first anti-sway valve 81 and the second anti-sway valve 82 are composed of the aforementioned adjustable threaded cartridge anti-sway valves. Port A and port B of the first anti-sway valve 81 are correspondingly communicated with the first working oil port 71 and the second working oil port 72 in the mounting seat 70, and port A and port B of the second anti-sway valve 82 are correspondingly communicated with the second working oil port 72 and the first working oil port 71 in the mounting seat 70.

[0044] In the present utility model, the sealing plug 20 is locked by a locking nut 30. By rotating the sealing plug 20, the length of the sealing plug 20 screwed into the mating inner hole can be adjusted, so as to adjust the pre-compression amount of the piston return spring 52 through the plunger 53 and the control piston 51, and further adjust the pressure regulation of the anti-sway valve intervention. The anti-sway valve intervention pressure can be adjusted online without stopping the machine equipment where it is located; in addition, only by rotating the sealing plug for adjustment, no parts need to be removed, and the operation is simple; and the sealing plug can achieve stepless adjustment with high adjustment accuracy.

Claims

1. An adjustable threaded cartridge anti-sway valve, comprising a valve body provided with an external thread for installation, a pressure balance mechanism installed in the mating inner hole of the valve body for unloading and communicating between port A and port B, and a sealing plug installed at the outer end of the mating inner hole, the inner end of the sealing plug abuts against the plunger in the pressure balance mechanism; characterized in that, It further includes a lock nut. An inner thread section and an outer thread section are provided on the outer cylindrical surface of the sealing plug. The inner thread section is engaged with the internal thread of the mating inner hole. The lock nut is located outside the valve body and engaged with the outer thread section and abuts against the valve body. A sealing ring is provided between the sealing plug and the wall of the mating inner hole.

2. The adjustable threaded plug-in anti-sway valve according to claim 1, wherein, The sealing ring is sleeved between the inner thread section and the outer thread section.

3. The adjustable threaded insert anti-sway valve according to claim 2, wherein A sealing groove for accommodating the sealing ring is provided on the sealing plug.

4. The adjustable threaded insert anti-sway valve according to claim 2 or 3, characterized in that, The plug connection inner hole section of the mating inner hole for connecting with the sealing plug is a stepped hole, and the small-diameter section is located inside the large-diameter section. The internal thread engaged with the inner thread section is provided on the small-diameter section of the plug connection inner hole section.

5. The adjustable threaded inserted anti-sway valve according to claim 4, characterized in that, The large-diameter section of the plug connection inner hole section is a smooth hole section.

6. The adjustable threaded plug anti-sway valve according to claim 4, characterized in that, The large-diameter section of the plug connection inner hole section has a thread section engaged with the outer thread section and a smooth hole section engaged with the sealing ring.

7. The adjustable threaded plug anti-sway valve according to claim 1, characterized in that, An internal hexagonal installation process hole is provided at the outer end of the sealing plug.

8. The adjustable threaded insert anti-sway valve according to claim 1, characterized in that, The pressure balance mechanism further includes a control piston and a control valve core axially arranged in sequence in the mating inner hole, a steel ball arranged in the steel ball accommodating cavity formed at the end of the control piston and the control valve core, a piston return spring with two ends respectively abutting against the control piston and the valve body, and a valve core return spring axially abutting against the control valve core; a valve core oil passage communicating port A with the steel ball accommodating cavity is provided in the control valve core; the plunger is located in the chamber of the control piston and a piston oil passage communicating the steel ball accommodating cavity and the end chamber of the plunger is provided in the control piston. The control valve core and the valve body form a valve core damping cavity in the mating inner hole, and a valve core damping channel communicating the valve core damping cavity with the outside is provided on the valve body; a balance oil passage communicating port B with the control piston accommodating cavity is provided in the valve body.

9. The adjustable threaded insert anti-sway valve according to claim 8, wherein, The balance oil passage includes a piston balance oil passage communicating port B with the piston return spring accommodating cavity and a drain passage communicating the end chamber of the piston with port B; the end chamber of the piston is located at the end of the control piston adjacent to the control valve core.

10. A hydraulic motor, comprising a mounting base, characterized in that, A first anti-sway valve and a second anti-sway valve are installed on the mounting seat. Both the first anti-sway valve and the second anti-sway valve are composed of the adjustable threaded inserted anti-sway valve according to any one of claims 1 to 9. The port A and port B of the first anti-sway valve are correspondingly communicated with the first working oil port and the second working oil port in the mounting seat, and the port A and port B of the second anti-sway valve are correspondingly communicated with the second working oil port and the first working oil port in the mounting seat.

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