Precise regulator for number of turns of screw of cartridge valve and precise regulation method for number of turns of screw of cartridge valve

Abstract

The invention discloses an accurate regulator for the number of turns of a screw rod of a cartridge valve and an accurate regulation method for the number of turns of the screw rod of the cartridge valve, and relates to the technical field of hydraulic element testing. Openings are formed in one ends of the adjusting screw sleeve and the claw sleeve, through holes allowing the adjusting handle to penetrate through are correspondingly formed in the axes of the other ends of the adjusting screw sleeve and the claw sleeve, a plurality of clamping blocks are arranged at the opening end of the claw sleeve in the circumferential direction, and the clamping blocks can slide in the radial direction of the claw sleeve; an elastic supporting assembly is arranged in the claw sleeve, sliding guide structures are arranged between the elastic supporting assembly and the clamping blocks and between the adjusting threaded sleeve and the clamping blocks in a matched mode, the clamping blocks can move in the axial direction by rotating the adjusting threaded sleeve, and the sliding guide structures are used for synchronously driving the multiple clamping blocks to slide in the radial direction to be folded or unfolded. An angle measuring structure is arranged between the adjusting screw sleeve and the adjusting handle in a matched mode. The adjustable clamping function and the circle number visual accurate adjusting function are integrated through the integrated design, and the problems that in the prior art, the adjusting precision is low, and the operation efficiency is low are solved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic component testing technology, specifically to a cartridge valve screw count adjustment device and a method for precisely adjusting the number of cartridge valve screw counts. Background Technology

[0002] During the factory testing and performance studies of cartridge valves, it is necessary to repeatedly and precisely adjust the number of rotations of the valve core screw to calibrate the pressure parameters. In the existing technology, operators usually use a regular wrench or an Allen wrench to manually adjust the pressure. A standard Allen wrench is inserted into the adjusting hexagonal hole on the top of the cartridge valve, and the pre-compression of the pressure regulating spring is changed by manual rotation. In some cases, a regular open-end wrench is also used to clamp the outer hexagon of the cartridge valve to enhance fixation.

[0003] However, this traditional adjustment method has significant technical drawbacks. First, the adjustment accuracy is difficult to quantify and control, resulting in poor test consistency. Existing tools lack a visual indicator of the number of rotations, making it impossible for operators to accurately record and reproduce the screw rotation angle; they can only rely on subjective estimation. Because the thread lead of the cartridge valve pressure regulating screw is typically small (0.5-1.0 mm), even a small rotational deviation can cause significant pressure drift. In batch tests, the standard deviation of the data often exceeds ±0.3 MPa, far below the ±0.1 MPa requirement of modern hydraulic testing, introducing unacceptable systematic errors to the precise control of pressure variables in scientific research.

[0004] Secondly, insufficient rigidity in the connection between the tool and the valve body makes it prone to wobbling and play during adjustment. There are clearances between the internal hex wrench and the adjusting internal hex, and between the external hex clamping tool and the external hex of the valve body. Applying force during rotation inevitably causes radial runout, leading to distortion in the transmission of rotation angle. More seriously, this play disrupts the definite correspondence between the real-time position of the adjusting handle and the scale reference. When finely adjusting to the target pressure value, operators find it difficult to judge the actual rotation state, often resulting in "over-adjustment" or "inaccurate resetting." Mechanical vibrations in the testing environment further amplify the impact of this clearance, leading to instability in the adjustment process and prolonging the testing cycle.

[0005] Furthermore, existing tools suffer from poor versatility and low operational efficiency. Different manufacturers and series of cartridge valves exhibit significant differences in adjusting the internal hexagonal dimensions (commonly 4mm, 5mm, 6mm, 8mm, etc.) and the distance between opposite sides of the external hexagonal dimensions. Testing units must equip each specification with a dedicated wrench, resulting in a large variety of tools and high management costs. In batch testing scenarios, the purely manual operation mode is labor-intensive, with the tightening and unlocking processes being time-consuming and laborious. A complete adjustment cycle for a single valve body typically takes 3-5 minutes, severely hindering the improvement of production efficiency.

[0006] Therefore, there is an urgent need for a dedicated adjustment tool that integrates clamping and fine-tuning functions, is highly versatile, and has a low cost. Summary of the Invention

[0007] To address the shortcomings of the aforementioned background technology, this invention proposes a precise regulator for the number of turns of a cartridge valve screw, solving the technical problems of low precision and low operating efficiency in the prior art during adjustment.

[0008] The technical solution of this invention is implemented as follows: A precise adjuster for the number of turns of a cartridge valve screw includes an adjusting handle and an adjusting sleeve. A claw sleeve is internally threaded onto the adjusting sleeve. Both the adjusting sleeve and the claw sleeve have an opening at one end and a through hole at the axial direction of the other end to allow the adjusting handle to pass through. Several clamping blocks are circumferentially arranged at the open end of the claw sleeve, and each clamping block can slide radially along the claw sleeve. An elastic support assembly is provided inside the claw sleeve. Sliding guide structures are provided between the elastic support assembly and the clamping blocks, and between the adjusting sleeve and the clamping blocks. Rotating the adjusting sleeve allows it to move axially, and the sliding guide structures synchronously drive the clamping blocks to slide radially, thus closing or opening. An angle measuring structure is provided between the adjusting sleeve and the adjusting handle.

[0009] Preferably, the elastic support assembly includes an elastic element disposed within the claw sleeve, one end of which is connected to the inner end face of the claw sleeve, and the other end is connected to a spring seat, which is disposed at the opening of the claw sleeve.

[0010] Preferably, the sliding guide structure includes a first boss on the inner wall of the adjusting screw sleeve and a second boss on the spring seat. The inner and outer sides of the clamping block are respectively provided with a first guide surface for cooperating with the first boss and a second guide surface for cooperating with the second boss.

[0011] Preferably, the inner side of the clamping block is provided with a clamping surface that matches the clamping outer wall of the cartridge valve. The first boss is threadedly connected to the inner wall of the adjusting sleeve, and the first boss and the inner wall of the adjusting sleeve are fixed together by thread-locking adhesive. The clamping block is a cross-shaped clamping block, and the claw sleeve is provided with a cross-shaped limiting hole to allow the cross-shaped clamping block to pass through.

[0012] Preferably, the adjusting handle includes a center rod, the upper end of which is connected to the handle, and the lower end of which is provided with a plug-in portion for connecting to the cartridge valve core screw.

[0013] Preferably, the angle measuring structure includes a scale fixedly mounted on the end face of the adjusting screw sleeve, and a pointer fixedly mounted on the central rod for use with the scale. The elastic element is a spring, which is sleeved around the central rod. The outer circumference of the adjusting screw sleeve is provided with anti-slip knurling.

[0014] A method for precisely adjusting the screw count of a cartridge valve using the aforementioned precise screw count adjuster includes the following steps: Place the adjusting sleeve onto the cartridge valve, aligning the clamping block with the outer clamping wall of the cartridge valve, and insert the adjusting handle into the screw connection hole of the cartridge valve.

[0015] Rotating the adjusting screw sleeve causes it to advance axially, driving the clamping block to retract radially and self-center and clamp onto the outer wall of the cartridge valve's clamping mechanism.

[0016] Rotating the adjustment handle drives the screw of the cartridge valve to rotate, while observing the indication value of the angle measuring structure to precisely control the number of rotations and the angle.

[0017] After adjustment, rotate the adjusting sleeve in the opposite direction. The clamping block will automatically open under the restoring force of the elastic support component, achieving rapid unloading.

[0018] The beneficial effects of this invention are: This invention integrates adjustable clamping with a visually precise adjustment function based on the number of turns. By using the axial movement of the adjusting screw sleeve to simultaneously advance several clamping blocks to slide radially on the claw sleeve, it achieves self-centering and rigid clamping of the hexagonal outer side of cartridge valves of different specifications. This eliminates the fit clearance and play of traditional tools, reduces the angle transmission error when adjusting the number of turns and angle of the adjusting screw, and maintains stable repeatability accuracy during the adjustment of different cartridge valves, significantly improving test consistency and the accuracy of scientific research data.

[0019] Furthermore, by setting up an elastic support component, it can prevent the valve body from being damaged by clamping overload, and can also achieve rapid reset and unloading, extending tool life and ensuring operational safety. Thus, it achieves a unity of high precision, high rigidity, high versatility and low cost with a simple structure, improving assembly and disassembly efficiency. It effectively solves the problems of low precision, poor rigidity, insufficient versatility and low efficiency of existing technologies, and is suitable for precise control of the number of turns of the adjusting screw in the factory testing of cartridge valves and scientific research. Attached Figure Description

[0020] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 2 This is a front view structural diagram of the present invention; Figure 3 This is a three-dimensional structural diagram of the present invention; Figure 4 This is a three-dimensional structural schematic diagram from another perspective of the present invention; In the figure: 1: Adjusting handle, 2: Adjusting screw sleeve, 3: Claw sleeve, 4: Clamping block, 5: Elastic support assembly, 6: Elastic element, 7: Spring seat, 8: First boss, 9: Second boss, 10: First guide surface, 11: Second guide surface, 12: Center rod, 13: Handle, 14: Insertion part, 15: Dial, 16: Pointer. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1 , 2 As shown in Embodiment 1, a cartridge valve screw turn precision adjuster includes an adjusting handle 1 and an adjusting sleeve 2. The adjusting sleeve 2 is internally threaded with a claw sleeve 3. Both the adjusting sleeve 2 and the claw sleeve 3 have an opening at one end and a through hole at the axis of the other end to allow the adjusting handle 1 to pass through. The opening end of the claw sleeve 3 is provided with several clamping blocks 4 along the circumferential direction, and the clamping blocks 4 can slide radially along the claw sleeve 3.

[0024] The claw sleeve 3 is equipped with an elastic support component 5. Sliding guide structures are provided between the elastic support component 5 and the clamping block 4, and between the adjusting screw sleeve 2 and the clamping block 4. Rotating the adjusting screw sleeve 2 allows it to move axially, and the sliding guide structures synchronously drive several clamping blocks 4 to slide radially, thus closing or opening. An angle measuring structure is provided between the adjusting screw sleeve 2 and the adjusting handle 1, enabling visual measurement of the number of rotations.

[0025] In a further specific embodiment, the adjusting handle 1 includes a central rod 12, the upper end of which is connected to the handle 13, and the lower end of the central rod 12 is provided with a plug-in portion 14 for connecting with the valve core screw of a cartridge valve. In this embodiment, the plug-in portion 14 has an external hexagonal structure, which can be plugged into the internal hexagonal hole at the end of the screw of a conventional cartridge valve. When the handle is rotated, the screw of the cartridge valve connected to the plug-in portion can be rotated synchronously. In this embodiment, the handle 13 has an opening in the middle, and the upper end of the central rod 12 passes through the opening and is locked with a nut. In actual use, different specifications of central rods can be replaced, and different specifications of plug-in portions on different central rods can be used to match the screw adjustment holes of different cartridge valves. In addition, the design of the entire adjusting handle 1 independently inserting into the adjusting screw sleeve 2 is not subject to coaxiality requirements, the requirements for overall machining accuracy are not high, the cost is low, and it can be mass-produced. At the same time, this embodiment provides a simple and stable operating method, which can effectively avoid inaccurate adjustment caused by misoperation.

[0026] This embodiment integrates all components within the adjusting screw sleeve. Through integrated design, adjustable clamping and precise adjustment functions are combined into one. By using the axial movement of the adjusting screw sleeve 2 to synchronously advance several clamping blocks 4 to slide radially on the claw sleeve 3, self-centering and rigid clamping of the hexagonal outer side of cartridge valves of different specifications is achieved. This eliminates the fit clearance and play of traditional tools, reduces the angle transmission error when adjusting the number of turns and angle of the adjusting screw, and maintains stable repeatability accuracy during the adjustment of different cartridge valves, significantly improving test consistency and the accuracy of scientific research data.

[0027] Furthermore, by setting up elastic support components, it can prevent the valve body from being damaged by clamping overload, and can also achieve rapid reset and unloading, extending tool life and ensuring operational safety. Thus, it achieves a unity of high precision, high rigidity, high versatility and low cost with a simple structure, and improves assembly and disassembly efficiency.

[0028] Example 2, as Figure 1 , 3 As shown in Figure 4, a cartridge valve screw turn precision adjuster, based on embodiment 1, includes an elastic support assembly 5 comprising an elastic element 6 disposed within a claw sleeve 3. One end of the elastic element 6 is connected to the inner end face of the claw sleeve 3, and the other end is connected to a spring seat 7, which is located at the opening of the claw sleeve 3. In this embodiment, the elastic element 6 is a spring, which is sleeved around the center rod 12.

[0029] In addition, the sliding guide structure includes a first boss 8 on the inner wall of the adjusting screw sleeve 2 and a second boss 9 on the spring seat 7. The clamping block 4 has a first guide surface 10 for engaging with the first boss 8 and a second guide surface 11 for engaging with the second boss 9 on its inner and outer sides, respectively. In this embodiment, both the first and second bosses are annular bodies, fixed to the inner wall of the adjusting screw sleeve 2 and the end face of the spring seat, respectively. Both the first and second guide surfaces are smooth inclined surfaces. When the adjusting screw sleeve moves axially towards the open end, the annular end contacts the first guide surface and generates relative sliding, which pushes the clamping block to slide radially, achieving retraction. Simultaneously, the second guide surface and the second boss slide relative to each other, thereby pushing the second boss to move axially, realizing power transmission during the sliding process and compressing the spring. When disassembly and resetting are required, the adjusting screw sleeve moves axially away from the open end, the first boss loses its restriction on the second guide surface, and under the spring's resetting force, pushes the spring seat and the second boss downwards. Then, under the contact between the second boss and the second guide surface, the clamping block moves radially outwards, achieving rapid resetting. In addition, the spring's supporting function prevents the clamping block from being excessively squeezed or rubbed during clamping, ensuring the tool's long lifespan and high stability. Simultaneously, it ensures that the distance between the first boss 8 and the inner end face of the adjusting screw sleeve is sufficient to allow for relative movement between the adjusting screw sleeve and the claw sleeve during the clamping of the cartridge valve, thus avoiding any impact on the adjustment stroke.

[0030] As a further specific embodiment, a clamping surface matching the clamping outer wall of the cartridge valve is provided on the inner side of the clamping block 4. The clamping block 4 is a cross-shaped clamping block, and a cross-shaped limiting hole is provided on the claw sleeve 3 to allow the cross-shaped clamping block to pass through. The cross-shaped limiting hole and the cross-shaped clamping block are configured to restrict the movement path of the clamping block, allowing it to move only radially along the claw sleeve, thus meeting the adjustment requirements.

[0031] As a further optional implementation, to further facilitate motion transmission, extrusion slopes are provided at the ends of both the first boss and the second boss. The extrusion slopes are respectively in contact with the first guide surface and the second guide surface, thereby facilitating relative sliding between the second boss and the protrusion or between the first boss and the protrusion.

[0032] As a further specific implementation, for ease of assembly, the first boss 8 is threaded to the inner wall of the adjusting sleeve 2, and the threaded connection between the first boss 8 and the inner wall of the adjusting sleeve 2 is fixed with thread adhesive, thereby facilitating the installation of the claw sleeve 3 during the assembly process after the parts are processed.

[0033] Example 3 discloses a precise adjuster for the number of turns of a cartridge valve screw. Based on Example 2, the angle measuring structure includes a scale 15 fixedly mounted on the end face of the adjusting sleeve 2. A pointer 16, used in conjunction with the scale 15, is fixedly mounted on the central rod 12. Specifically, in this embodiment, the central rod has external threads, and the pointer's tail end has a through hole through which it is fitted onto the central rod. Nuts threaded onto the central rod on both sides of the pointer are used for locking. When adjusting the cartridge valve screw, rotating the central rod causes the pointer to rotate, thus changing the scale on the corresponding scale. Recording these changes allows for precise control of the number of turns of the cartridge valve screw, achieving accurate adjustment.

[0034] As a further optional solution, to facilitate adjustment, anti-slip knurling is provided on the outer circle of the adjusting sleeve 2, thereby increasing the friction during adjustment.

[0035] Example 4: A method for precisely adjusting the screw count of a cartridge valve, using the precise screw count adjuster for cartridge valves as described in the above example, includes the following steps: Step 1: Place the adjusting sleeve 2 onto the cartridge valve, and simultaneously align the clamping blocks 4 with the clamping outer walls of the hexagonal portion of the cartridge valve. Insert the adjusting handle 1 into the screw connection hole of the cartridge valve. Step Two: Rotate the adjusting sleeve 2 to advance it axially, driving the clamping block 4 to retract radially and self-center and clamp onto the outer wall of the cartridge valve. During this process, the clamping block 4 is limited by the outer hexagon of the cartridge valve, preventing the claw sleeve from rotating relative to the outer hexagon of the cartridge valve. The threaded engagement between the adjusting sleeve 2 and the claw sleeve 3 causes axial movement. The first boss on the inner wall of the adjusting sleeve 2 contacts the first guide surface of the clamping block, generating a radial force that forces the six clamping blocks to move radially towards the center synchronously within the cross-shaped limiting hole of the claw sleeve, forming a self-centering clamping force. At the same time, the clamping blocks push the second boss and the spring seat to move axially, compressing the spring to store energy. The reaction force of the spring acts continuously on the second guide surface of the clamping block through the spring seat and the second boss, providing stable support force so that the six clamping blocks firmly hold the outer hexagon of the cartridge valve, preventing excessive shaking. After holding the outer hexagon of the cartridge valve, the dial and the cartridge valve are relatively stationary and there is no play.

[0036] Step 3: Rotate the adjusting handle 1 to drive the screw of the cartridge valve to rotate, adjusting the number of turns of the cartridge valve screw. Simultaneously observe the indication value of the angle measuring structure to precisely control the number of turns and the angle. During adjustment, the scale on the dial remains clearly visible, and no scale error or loosening will occur regardless of external vibration or operational interference during the adjustment process. This design ensures the accuracy and consistency of the entire adjustment process.

[0037] Step 4: After adjustment, rotate the adjusting sleeve 2 in the reverse direction. The clamp 4 automatically opens under the restoring force of the elastic support component 5, achieving rapid unloading. When the adjusting sleeve rotates outward in the reverse direction, the radial constraint of the first boss on the first guide surface is released. The restoring force of the spring pushes the spring seat forward, and the spring seat pushes the clamp to slide outward along the cross-shaped limiting hole, achieving automatic reset and release. This process ensures that the clamp can accurately return to its initial state without external interference, preparing it for the next adjustment.

[0038] As a further optional implementation, when clamping cartridge valves of different sizes, before putting the adjusting sleeve 2 on the cartridge valve, the operator holds the adjusting sleeve with one hand and keeps the claw sleeve stationary with the other hand, and rotates the adjusting sleeve so that the polygonal restriction space formed by the six clamping blocks is slightly larger than the outer hexagon of the cartridge valve. Then, the adjusting sleeve 2 is put on the cartridge valve for subsequent adjustment. This process can prevent the gap between the clamping blocks and the inner hexagon from being too large to achieve rotation restriction during the rotation of the adjusting sleeve, thus preventing the inner claw sleeve from moving synchronously with the adjusting sleeve and failing to clamp.

[0039] Therefore, this regulating tool can effectively handle both large and small cartridge valves, greatly improving its versatility and operability. Furthermore, the tool's independent insertion design reduces the overall machining precision requirements, thereby lowering manufacturing costs and increasing production efficiency.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A plug valve screw turns accurate adjuster, characterized in that: The adjusting handle (1) and the adjusting sleeve (2) are included, the claw sleeve (3) is connected with the adjusting sleeve (2) in the thread, the adjusting sleeve (2) and the claw sleeve (3) one end are equipped with the opening, the other end's axis is all correspondingly equipped with the through hole that satisfies the adjusting handle (1) and is equipped, the claw sleeve (3) opening end is equipped with a plurality of clamping blocks (4) along the circumference, the clamping block (4) can slide along the claw sleeve (3) radially;The claw sleeve (3) is equipped with elastic support assembly (5) inside, and the elastic support assembly (5) and the clamping block (4) between, the adjusting sleeve (2) and the clamping block (4) between are all matched with the sliding guide structure, by rotating the adjusting sleeve (2) can move along the axial direction, utilize the sliding guide structure synchronous drive a plurality of clamping blocks (4) along the radial direction and close or expand;The adjusting sleeve (2) and the adjusting handle (1) between matched angle measurement structure.

2. The plug valve stem turn count precision adjuster of claim 1, wherein: The elastic support assembly (5) includes the elastic element (6) in the claw sleeve (3), the elastic element (6) one end is connected with the inner end surface of the claw sleeve (3), the other end is connected with the spring seat (7), and the spring seat (7) is arranged at the opening of the claw sleeve (3).

3. The plug valve stem turn count precision adjuster of claim 2, wherein: The sliding guide structure includes the first boss (8) on the inner wall of the adjusting sleeve (2) and the second boss (9) on the spring seat (7), and the first guide surface (10) and the second guide surface (11) are respectively arranged on the inner and outer sides of the clamping block (4) for cooperating with the first boss (8) and the second boss (9).

4. The plug valve stem turn count precision adjuster of claim 3, wherein: The inner side of the clamping block (4) is provided with a clamping surface matched with the clamping outer wall of the cartridge valve.

5. The plug valve stem turn count precision adjuster of claim 4, wherein: The first boss (8) is threadedly connected to the inner wall of the adjusting sleeve (2), and the first boss (8) and the inner wall of the adjusting sleeve (2) are fixed by thread glue.

6. The plug valve stem turn count precision adjuster of any one of claims 2-5, wherein: The clamping block (4) is a cross-shaped clamping block, and the claw sleeve (3) is provided with a cross-shaped limiting hole for passing the cross-shaped clamping block.

7. The plug valve stem turn count precision adjuster of claim 6, wherein: The adjusting handle (1) includes a center rod (12), and the upper end of the center rod (12) is connected with a handle (13). The lower end of the center rod (12) is provided with a plug-in part (14) for connecting with the screw rod of the cartridge valve core.

8. The plug valve stem turn count precision adjuster of claim 7, wherein: The angle measurement structure includes a scale disc (15) fixedly arranged on the end face of the adjusting sleeve (2), and a pointer (16) fixedly arranged on the center rod (12) for cooperating with the scale disc (15).

9. The plug valve stem turn count precision adjuster of claim 8, wherein: The elastic element (6) is a spring, and the spring is sleeved on the periphery of the center rod (12).

10. A method for accurately adjusting the number of turns of a plug valve screw, characterized by, The outer circle of the adjusting sleeve (2) is provided with an anti-skid knurl. The cartridge valve screw number accurate adjuster comprises the following steps: The adjusting sleeve (2) is sleeved on the cartridge valve, and the clamping block (4) is correspondingly arranged on the clamping outer wall of the cartridge valve. The adjusting handle (1) is inserted into the screw rod connecting hole of the cartridge valve. The adjusting sleeve (2) is rotated to axially advance, drive the clamping block (4) to radially close and self-centering clamping on the clamping outer wall of the cartridge valve. The adjusting handle (1) is rotated to drive the screw rod of the cartridge valve to rotate, and the indicating value of the angle measurement structure is observed to accurately control the number of rotation and the angle. After the adjustment is completed, the adjusting sleeve (2) is reversely rotated, and the clamping block (4) is automatically opened under the reset force of the elastic support assembly (5), thereby achieving rapid unloading.

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