Throttling device for two-way cartridge valve

Abstract

The invention discloses a throttling device for a two-way cartridge valve. The throttling device comprises a mounting shell; the connecting shaft is arranged on the mounting shell; the driving screw rod is arranged on the connecting shaft, and the end part of the driving screw rod extends to the upper part of the mounting shell; the mounting base is arranged at one end, opposite to the driving screw rod, of the connecting shaft; the servo motor is in transmission connection with the driving screw rod so as to drive the driving screw rod, the connecting shaft and the mounting base to rotate synchronously; and the limiting ejector rod is arranged at the other end of the mounting shell, is in threaded connection with the mounting base, and is driven by rotation of the mounting base to move close to or away from the mounting shell in the axial direction of the limiting ejector rod, so that the maximum stroke of a valve element of the two-way cartridge valve is adjusted by changing the extending length of the limiting ejector rod. The problems that a limiting ejector rod of a traditional throttler is large in torque and prone to mechanical deformation failure, vibration of the limiting ejector rod is directly transmitted to a servo motor, and the use precision and the service life of the servo motor are affected can be solved.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a throttling device for a two-way cartridge valve. Background Technology

[0002] The throttling device for two-way cartridge valves is one of the core components of modern high-power hydraulic technology. It achieves efficient and reliable control of large-flow hydraulic fluids through the ingenious principle of "small valve controlling large valve." Due to its advantages such as large flow capacity, fast response, good sealing performance, and ease of integration, it is widely used in applications requiring high pressure and high flow rates. Precise control of the valve core stroke of the two-way cartridge valve is key to achieving stepless flow regulation.

[0003] The existing limit rod of the throttle is mainly connected to the internal drive shaft. The extension length is adjusted by the rotation of the drive shaft. The rapid start of the valve core of the two-way cartridge valve and the impact of high-pressure oil will be directly transmitted to the drive shaft and the servo motor connected to the drive shaft through the valve core and the limit rod. Although the vibration can be eliminated by transmitting it to the housing through the drive shaft, the vibration has been directly transmitted to the servo motor, which may cause the servo motor to lose synchronization, the bearing to be damaged, and the internal circuit of the servo motor to be interfered with. In addition, the torque acting on the limit rod is large, which can easily cause the limit rod to fail due to mechanical deformation.

[0004] Therefore, it is urgent to research and develop a throttling device for two-way cartridge valves to solve the above-mentioned technical defects. Summary of the Invention

[0005] The purpose of this invention is to provide a throttling device for a two-way cartridge valve. This throttling device can solve the problems of large torque of the limit rod of traditional throttling devices, which is prone to mechanical deformation failure, and the vibration of the limit rod being directly transmitted to the servo motor, affecting the accuracy and lifespan of the servo motor.

[0006] To achieve the above objectives, the present invention provides a throttling device for a two-way cartridge valve, the specific implementation of which is as follows:

[0007] A throttling device for a two-way cartridge valve, comprising:

[0008] Mounting housing;

[0009] A connecting shaft is provided on the mounting housing;

[0010] A drive screw is mounted on the connecting shaft, with its end extending above the mounting housing;

[0011] The mounting base is located on the end of the connecting shaft opposite to the drive screw;

[0012] A servo motor is connected to the drive screw to drive the drive screw, connecting shaft and mounting base to rotate synchronously.

[0013] A limiting rod is located at the other end of the mounting housing and is screwed to the mounting base. Driven by the rotation of the mounting base, the limiting rod moves closer to or further away from the mounting housing along its axial direction, so as to adjust the maximum stroke of the two-way cartridge valve core by changing the extension length of the limiting rod.

[0014] This invention provides a throttling device for a two-way cartridge valve. Compared to existing technologies, by mounting a limiting rod on the mounting housing and screwing it to the mounting base to form a threaded pair, the driving torque of the servo motor is entirely borne by the rotating components consisting of the drive screw, connecting shaft, and mounting base. The limiting rod itself does not transmit torque, eliminating the risk of bending deformation or mechanical failure due to the limiting rod bearing large torque. Furthermore, when the limiting rod is subjected to impact or vibration from the two-way cartridge valve or external sources, the vibration energy is directly transmitted through the limiting rod and dissipated in the stationary mounting housing. This effectively weakens or even cuts off the path of vibration transmission to the servo motor via the transmission chain, thereby significantly reducing the additional load on the motor and ensuring its control accuracy and service life.

[0015] In some embodiments, the mounting housing includes a first housing and a second housing, the first housing having the connecting shaft inside, the connecting shaft having the drive screw on its end face opposite to the second housing, and the drive screw extending above the first housing and being connected to the servo motor for transmission.

[0016] By adopting a split first and second shell structure, it is convenient to assemble, debug and maintain the internal components of the shell, and protect the precision parts from external contamination, making the assembly process more reasonable and reducing the difficulty of production and manufacturing.

[0017] In some embodiments, the first housing has a first receiving groove, the connecting shaft is disposed in the first receiving groove, and the top of the first receiving groove is open to allow the drive screw to extend above the first housing.

[0018] By setting a first receiving groove in the first housing, a precise installation positioning reference is provided for the connecting shaft, ensuring the coaxiality of its rotation axis with the housing, thereby ensuring smooth transmission and reducing abnormal wear.

[0019] In some embodiments, the first receiving groove is provided with a plurality of steps, and each step is provided with a sealing ring, which is sleeved on the drive screw or connecting shaft to prevent high-pressure hydraulic oil leakage.

[0020] By setting multiple steps and installing sealing rings in the first receiving groove, a multi-layered sealing defense is formed, which can effectively adapt to the high-pressure hydraulic oil environment that may exist inside the device, prevent oil from leaking outward along the axial clearance of the drive screw or connecting shaft, and ensure that external electronic components (such as servo motors) and internal transmission mechanisms are not corroded by oil under long-term high-pressure operation, thus ensuring the life of the equipment and operational safety.

[0021] In some embodiments, the drive screw is integrally formed with the connecting shaft.

[0022] By using a one-piece molding process for the drive screw and connecting shaft, assembly errors, connection gaps, and potential loosening risks that may occur when the two are connected by components such as couplings are eliminated. This also improves the overall rigidity and coaxiality of the transmission chain, making power transmission more direct and precise, reducing energy loss and motion lag, and further enhancing the response speed and fine-tuning accuracy of stroke adjustment.

[0023] In some embodiments, the end face of the connecting shaft facing the second housing is provided with a clearance area to allow the limiting rod to move, thereby avoiding interference between the limiting rod and the connecting shaft.

[0024] By setting a clearance area on the end face of the connecting shaft, the necessary physical space is provided for the telescopic movement of the limit rod, effectively avoiding mechanical interference or collision between the rotating connecting shaft and the limit rod that moves in a straight line, and ensuring smooth and unobstructed adjustment.

[0025] In some embodiments, a limiting member is provided in the clearance area, and the limiting member cooperates with the limiting top rod to prevent the limiting top rod from swaying in the clearance area.

[0026] By adding a limiting component in the clearance area to form a limiting fit with the limiting top rod, the problem of radial swaying that may occur when the limiting top rod is not under force or is subjected to lateral force is solved. Unnecessary degrees of freedom are restricted, the straightness and stability of the movement trajectory of the limiting top rod are improved, thereby improving the repeatability of stroke adjustment and reducing wear and abnormal noise caused by swaying.

[0027] In some embodiments, the second housing is provided with a second receiving groove. When the second housing is connected to the first housing, the first receiving groove is connected to the first receiving groove, and an installation area is formed between the first receiving groove and the second receiving groove. The mounting base is disposed in the installation area.

[0028] The second receiving groove on the second housing and the first receiving groove on the first housing together form an installation area, and the mounting base is placed in the installation area to prevent external contaminants from entering and causing wear or jamming. The split groove structure makes the installation, fixing and maintenance of the mounting base more convenient, reflecting good manufacturability and maintainability.

[0029] In some embodiments, the second housing has a through hole that leads to the second receiving groove, and the limiting top rod extends through the through hole to the outside of the second housing.

[0030] By providing a through hole in the second housing to guide the second receiving groove, the limiting rod extends from the through hole to the outside of the second housing to contact and limit the stroke of the valve core, ensuring that the limiting rod can accurately and stably apply its end position to the external valve core.

[0031] In some embodiments, the first housing is provided with a coupling, and the servo motor and the connecting shaft are both drivenly connected to the coupling.

[0032] The coupling enables the transmission connection between the servo motor output shaft and the drive screw, which can compensate for minor installation alignment errors, absorb some of the impact when the servo motor starts and stops, protect the precision transmission components, and allow the servo motor to be installed and replaced as an independent module, improving the modularity and maintenance convenience of the device.

[0033] Based on the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0034] By mounting the limit rod on the mounting housing and screwing it to the mounting base to form a threaded pair, on the one hand, the driving torque of the servo motor is entirely borne by the rotating components consisting of the drive screw, connecting shaft, and mounting base, and the limit rod itself does not transmit torque, eliminating the risk of bending deformation or mechanical failure due to the limit rod bearing large torque; on the other hand, when the limit rod is subjected to impact or vibration from a two-way cartridge valve or external sources, the vibration energy is directly transmitted by the limit rod and dissipated in the stationary mounting housing, effectively weakening or even cutting off the path of vibration transmitted to the servo motor through the transmission chain, thereby significantly reducing the additional load on the motor and ensuring its control accuracy and service life. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the present invention;

[0036] Figure 2 This is a cross-sectional view of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the present invention in conjunction with a two-way cartridge valve.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100. Mounting housing; 110. First housing; 111. First receiving groove; 112. Opening; 113. Step; 114. Sealing ring; 120. Second housing; 121. Second receiving groove; 122. Through hole; 200. Mounting base; 300. Connecting shaft; 310. Clearance area; 320. Limiting element; 400. Drive screw; 500. Servo motor; 510. Coupling; 600. Valve body; 610. Valve core; 700. Limiting rod. Detailed Implementation

[0040] To facilitate understanding of the present invention, specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0041] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0042] Unless otherwise stated or defined, the term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0043] It should be noted that in this article, "fixed to" or "connected to" can mean directly fixed to or connected to a component, or indirectly fixed to or connected to a component.

[0044] like Figure 1-3 As shown, the throttling device for a two-way cartridge valve provided in this embodiment includes:

[0045] Mounting housing 100;

[0046] A connecting shaft 300 is disposed on the mounting housing 100;

[0047] A drive screw 400 is mounted on the connecting shaft 300, with its end extending above the mounting housing 100;

[0048] The mounting base 200 is located on the end of the connecting shaft 300 opposite to the drive screw 400;

[0049] A servo motor 500 is connected to the drive screw 400 to drive the drive screw 400, the connecting shaft 300, and the mounting base 200 to rotate synchronously.

[0050] A limiting rod 700 is located at the other end of the mounting housing 100 and is screwed to the mounting base 200. Driven by the rotation of the mounting base 200, the limiting rod 700 moves closer to or further away from the mounting housing 100 along the axial direction of the limiting rod 700, so as to adjust the maximum stroke of the two-way cartridge valve core 610 by changing the extension length of the limiting rod 700.

[0051] In some embodiments, the servo motor 500 is preferably a stepper motor.

[0052] In some embodiments, the mounting housing 100 includes a first housing 110 and a second housing 120. The first housing 110 is provided with the connecting shaft 300. The end face of the connecting shaft 300 opposite to the second housing 120 is provided with the drive screw 400. The drive screw 400 extends above the first housing 110 and is connected to the servo motor 500 for transmission.

[0053] By adopting a split structure of the first housing 110 and the second housing 120, it is convenient to assemble, debug and maintain the internal components of the housing 100, and protect the precision parts from external contamination, making the assembly process more reasonable and reducing the difficulty of production and manufacturing.

[0054] In some embodiments, the first housing 110 is provided with a first receiving groove 111, the connecting shaft 300 is disposed in the first receiving groove 111, and the top of the first receiving groove 111 is open 112 so that the drive screw 400 can extend above the first housing 110.

[0055] By providing a first receiving groove 111 in the first housing 110, a precise installation positioning reference is provided for the connecting shaft 300, ensuring the coaxiality of its rotation axis with the housing, thereby ensuring smooth transmission and reducing abnormal wear.

[0056] In some embodiments, the first receiving groove 111 is provided with a plurality of steps 113, and each step 113 is provided with a sealing ring 114. The sealing ring 114 is sleeved on the drive screw 400 or the connecting shaft 300 to prevent high pressure hydraulic oil leakage.

[0057] By setting multiple steps 113 and installing sealing rings 114 in the first receiving groove 111, a multi-layer sealing defense is formed, which can effectively adapt to the high-pressure hydraulic oil environment that may exist inside the device, prevent oil from leaking outward along the axial clearance of the drive screw 400 or the connecting shaft 300, and ensure that under long-term high-pressure operation, external electronic components (such as servo motor 500) and internal transmission mechanisms are not corroded by oil, thus ensuring the life of the equipment and operational safety.

[0058] In some embodiments, the drive screw 400 is integrally formed with the connecting shaft 300.

[0059] By using a single-piece manufacturing process for the drive screw 400 and the connecting shaft 300, assembly errors, connection gaps, and potential loosening risks that may occur when the two are connected by components such as the coupling 510 are eliminated. This also improves the overall rigidity and coaxiality of the transmission chain, making power transmission more direct and precise, reducing energy loss and motion lag, and further enhancing the response speed and fine-tuning accuracy of stroke adjustment.

[0060] In some embodiments, the connecting shaft 300 has a clearance area 310 on one end face facing the second housing 120 to allow the limiting rod 700 to move, thereby avoiding interference between the limiting rod 700 and the connecting shaft 300.

[0061] By setting a clearance area 310 on the end face of the connecting shaft 300, the necessary physical space is provided for the telescopic movement of the limit rod 700, effectively avoiding mechanical interference or collision between the rotating connecting shaft 300 and the limit rod 700 that is moving in a straight line, and ensuring smooth and unobstructed adjustment.

[0062] In some embodiments, a limiting member 320 is provided in the clearance area 310, and the limiting member 320 cooperates with the limiting top rod 700 to prevent the limiting top rod 700 from shaking in the clearance area 310.

[0063] By adding a limiting component 320 in the clearance area 310 to form a limiting engagement with the limiting rod 700, the problem of radial swaying that may occur when the limiting rod 700 is not under force or is subjected to lateral force is solved. Unnecessary degrees of freedom are restricted, and the straightness and stability of the movement trajectory of the limiting rod 700 are improved, thereby improving the repeatability of stroke adjustment and reducing wear and abnormal noise caused by swaying.

[0064] In some embodiments, the second housing 120 is provided with a second receiving groove 121. When the second housing 120 is connected to the first housing 110, the first receiving groove 111 is connected to the first receiving groove 121. An installation area is formed between the first receiving groove 111 and the second receiving groove 121, and the mounting base 200 is disposed in the installation area.

[0065] The second receiving groove 121 on the second housing 120 and the first receiving groove 111 on the first housing 110 together form an installation area, and the mounting base 200 is placed in the installation area to prevent external contaminants from entering and causing wear or jamming. The split groove structure makes the installation, fixing and maintenance of the mounting base 200 more convenient, reflecting good manufacturability and maintainability.

[0066] In some embodiments, the second housing 120 is provided with a through hole 122 that guides the second receiving groove 121, and the limiting top rod 700 extends through the through hole 122 to the outside of the second housing 120.

[0067] By providing a through hole 122 on the second housing 120 to guide the second receiving groove 121, the limiting rod 700 extends from the through hole 122 to the outside of the second housing 120 to contact and limit the stroke of the valve core 610, ensuring that the limiting rod 700 can accurately and stably apply its end position to the external valve core 610.

[0068] In some embodiments, the first housing 110 is provided with a coupling 510, and the servo motor 500 and the connecting shaft 300 are both connected to the coupling 510 for transmission.

[0069] The coupling 510 enables the transmission connection between the output shaft of the servo motor 500 and the drive screw 400, which can compensate for minor installation alignment errors, absorb some of the impact when the servo motor 500 starts and stops, protect the precision transmission components, and allow the servo motor 500 to be installed and replaced as an independent module, improving the modularity and maintenance convenience of the device.

[0070] In some embodiments, the limiting rod 700 passes through the valve body 600 of the two-way cartridge valve and is inserted into the valve core 610, and the flow rate of the valve core 610 is controlled by the length of the limiting rod 700 inserted into the valve core 610.

[0071] The throttling device for a two-way cartridge valve provided in this embodiment, compared with the prior art, by setting the limiting rod 700 on the mounting housing 100 and screwing it to the mounting base 200 to form a threaded pair, on the one hand, the driving torque of the servo motor 500 is entirely borne by the rotating components composed of the drive screw 400, the connecting shaft 300 and the mounting base 200, and the limiting rod 700 itself does not transmit torque, eliminating the risk of bending deformation or mechanical failure due to the limiting rod 700 bearing large torque; on the other hand, when the limiting rod 700 is subjected to impact or vibration from the two-way cartridge valve or external sources, the vibration energy is directly transmitted by the limiting rod 700 and dissipated in the stationary mounting housing 100, effectively weakening or even cutting off the path of vibration transmitted to the servo motor 500 through the transmission chain, thereby significantly reducing the additional load on the motor and ensuring its control accuracy and service life.

[0072] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A throttling device for a two-way cartridge valve, characterized in that, include: Mounting housing (100); A connecting shaft (300) is provided on the mounting housing (100); A drive screw (400) is mounted on the connecting shaft (300) and its end extends above the mounting housing (100); The mounting base (200) is located on the end of the connecting shaft (300) opposite to the drive screw (400); A servo motor (500) is connected to the drive screw (400) to drive the drive screw (400), the connecting shaft (300) and the mounting base (200) to rotate synchronously; A limiting rod (700) is located at the other end of the mounting housing (100) and screwed to the mounting base (200). Driven by the rotation of the mounting base (200), the limiting rod (700) moves along the axial direction to approach or move away from the mounting housing (100) so as to adjust the maximum stroke of the two-way cartridge valve core (610) by changing the extension length of the limiting rod (700).

2. The throttling device for a two-way cartridge valve as described in claim 1, characterized in that, The mounting housing (100) includes a first housing (110) and a second housing (120). The first housing (110) is provided with the connecting shaft (300). The end face of the connecting shaft (300) opposite to the second housing (120) is provided with the drive screw (400). The drive screw (400) extends to the top of the first housing (110) and is connected to the servo motor (500) for transmission.

3. The throttling device for a two-way cartridge valve as described in claim 2, characterized in that, The first housing (110) is provided with a first receiving groove (111), and the connecting shaft (300) is provided in the first receiving groove (111). The top of the first receiving groove (111) is open (112) so that the drive screw (400) can extend to the top of the first housing (110).

4. The throttling device for a two-way cartridge valve as described in claim 3, characterized in that, The first receiving groove (111) is provided with several steps (113), and each step (113) is provided with a sealing ring (114). The sealing ring (114) is sleeved on the drive screw (400) or the connecting shaft (300) to prevent high pressure hydraulic oil leakage.

5. The throttling device for a two-way cartridge valve as described in any one of claims 2-4, characterized in that, The drive screw (400) and the connecting shaft (300) are integrally formed.

6. The throttling device for a two-way cartridge valve as described in any one of claims 2-4, characterized in that, The connecting shaft (300) has a clearance area (310) on one end face facing the second housing (120) to allow the limiting rod (700) to move and avoid interference between the limiting rod (700) and the connecting shaft (300).

7. The throttling device for a two-way cartridge valve as described in claim 6, characterized in that, The clearance area (310) is provided with a limiting member (320), which cooperates with the limiting rod (700) to prevent the limiting rod (700) from shaking in the clearance area (310).

8. The throttling device for a two-way cartridge valve as described in claim 3 or 4, characterized in that, The second housing (120) is provided with a second receiving groove (121). When the second housing (120) is connected to the first housing (110), the first receiving groove (111) is connected to the first receiving groove (111). An installation area is formed between the first receiving groove (111) and the second receiving groove (121). The mounting base (200) is located in the installation area.

9. The throttling device for a two-way cartridge valve as described in claim 8, characterized in that, The second housing (120) is provided with a through hole (122) that leads to the second receiving groove (121), and the limiting top rod (700) extends through the through hole (122) to the outside of the second housing (120).

10. The throttling device for a two-way cartridge valve as described in any one of claims 2-4, characterized in that, The first housing (110) is provided with a coupling (510), and the servo motor (500) and the connecting shaft (300) are both connected to the coupling (510) for transmission.

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