A screw stroke positioner

Abstract

This invention relates to a screw stroke positioner, the key technical points of which are: It includes: a rod body; a threaded section in the middle of the rod body; a first threaded ring rotatably disposed at one end of the rod body, and a second threaded ring disposed at the other end; the rod body also has a first locking component for locking the first threaded ring and a second locking component for locking the second threaded ring; the threaded section, the first threaded ring, and the second threaded ring form a stroke thread; a stroke slide is threadedly connected to the stroke thread; after the stroke slide moves to the limit position of the first threaded ring, the stroke slide presses the first locking component to release the locking state of the first threaded ring; after the stroke slide moves to the limit position of the second threaded ring, the stroke slide presses the second locking component to release the locking state of the second threaded ring; this application has the effect of limiting and protecting the stroke slide, preventing the stroke slide from continuing to slide and thus causing wear between parts.

Description

Technical Field

[0001] This invention relates to the field of stroke positioner technology, and more specifically, to a screw stroke positioner. Background Technology

[0002] Currently, screw travel positioners on the market use manual or electric drive to rotate the screw, causing the travel slide on the screw to move to a specified position. They are mainly used for adjusting the height of furniture, adjusting the position of furniture retraction and unfolding, and positioning the movement of some mechanical equipment.

[0003] However, existing screw travel positioners only include a screw and a travel slide. The travel slide is threaded onto the screw, and the travel slide slides along the screw axis by rotating the screw. There are no limit protection devices at both ends of the screw. When a fault occurs and the screw continues to rotate, the travel slide will slide towards both ends of the screw, causing the travel slide to slip off from both ends of the screw or to cause continuous compression and wear with other parts at both ends of the screw, which can easily damage the screw travel positioner or other parts. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a screw stroke positioner that has the function of limiting and protecting the stroke slide, preventing the stroke slide from continuing to slide and causing wear between parts.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] A screw stroke positioner includes: a rod body; a threaded section provided in the middle of the rod body; a first threaded ring adapted to the threaded section is rotatably provided at one end of the rod body, and a second threaded ring adapted to the threaded section is provided at the other end; the rod body is also provided with a first locking component for locking the first threaded ring and a second locking component for locking the second threaded ring; the threaded section, the first threaded ring, and the second threaded ring form a stroke thread; a stroke slide is threadedly connected to the stroke thread; after the stroke slide moves to the limit position of the first threaded ring, the stroke slide presses the first locking component to release the locking state of the first locking component on the first threaded ring; after the stroke slide moves to the limit position of the second threaded ring, the stroke slide presses the second locking component to release the locking state of the second locking component on the second threaded ring.

[0007] Optionally, the first locking component is provided with a first locking block; the end of the first locking block near the travel slide is inclined; the first threaded ring is provided with a first locking through hole adapted to the first locking block for the first locking block to extend out; the first locking block is locked into the first locking through hole; after the travel slide moves to the limit position of the first threaded ring, the travel slide presses the first locking block to release the locking state between the first locking block and the first locking through hole.

[0008] Optionally, the first locking component includes: a first fixing member, a first elastic member, and a first locking member; the first fixing member is disposed on the rod body; the first locking member is slidably disposed on the rod body along the axial direction of the rod body; one end of the first elastic member abuts against the first fixing member, and the other end abuts against the first locking member; the first snap-fit ​​block is disposed on the first locking member.

[0009] Optionally, the first locking element includes: a first ring body and at least one first sliding block; both the first sliding block and the first locking block are disposed on the first ring body; the first ring body is sleeved on the rod body; the rod body is axially provided with at least one first sliding groove corresponding to at least one first sliding block; the first sliding block is slidably disposed on the first sliding groove.

[0010] Optionally, the first threaded ring includes: a first cylindrical body and a second ring body; the first cylindrical body and the second ring body are fixedly connected; the first cylindrical body and the second ring body are both sleeved on one end of the rod body; the first cylindrical body is provided with a first thread; the threaded segment, the first thread and the second threaded ring form a stroke thread; the first locking through hole is opened on the second ring body.

[0011] Optionally, the second locking component is provided with a second locking block; the end of the second locking block near the travel slide is inclined; the inclination direction of the end of the second locking block near the travel slide is opposite to the inclination direction of the end of the first locking block near the travel slide; the second threaded ring is provided with a second locking through hole adapted to the second locking block for the second locking block to extend out; the second locking block is locked in the second locking through hole; after the travel slide moves to the limit position of the second threaded ring, the travel slide presses the second locking block to release the locking state between the second locking block and the second locking through hole.

[0012] Optionally, the second locking component includes: a second fixing member, a second elastic member, and a second locking member; the second fixing member is disposed on the rod body; the second locking member is slidably disposed on the rod body along the axial direction of the rod body; one end of the second elastic member abuts against the second fixing member, and the other end abuts against the second locking member; the second snap-fit ​​block is disposed on the second locking member.

[0013] Optionally, the second locking element includes: a third ring body and at least one second sliding block; the second sliding block and the second locking block are both disposed on the third ring body; the third ring body is sleeved on the rod body; the rod body has at least one second sliding groove axially formed corresponding to the at least one second sliding block; the second sliding block is slidably disposed on the second sliding groove.

[0014] Optionally, the second threaded ring includes: a second cylindrical body and a fourth ring body; the second cylindrical body and the fourth ring body are fixedly connected; the second cylindrical body and the fourth ring body are both sleeved on the other end of the rod body; a second thread is provided on the second cylindrical body; the threaded segment, the first threaded ring and the second thread form a stroke thread; the second snap-fit ​​hole is opened on the fourth ring body.

[0015] In summary, the present invention has the following beneficial effects: through the cooperation of the first locking component and the first threaded ring, and the cooperation of the second locking component and the second threaded ring, the travel slide is limited and protected, preventing the travel slide from continuing to slide to both ends and causing wear between parts, thereby improving the service life of the product. Attached Figure Description

[0016] Figure 1 This is an exploded view of the present invention;

[0017] Figure 2 This is a schematic diagram of the overall structure of the present invention, in which both the first and second threaded rings are in a locked state.

[0018] Figure 3 yes Figure 2 A partial sectional view along line AA in the middle;

[0019] Figure 4 This is a schematic diagram of the overall structure of the first threaded ring in the unlocked state in this invention;

[0020] Figure 5 yes Figure 4 A partial sectional view along line BB.

[0021] In the diagram: 1. Rod body; 11. Threaded section; 12. First sliding groove; 13. Second sliding groove; 2. First threaded ring; 21. First cylinder; 211. First thread; 22. Second ring; 221. First locking hole; 3. Second threaded ring; 31. Second cylinder; 311. Second thread; 32. Fourth ring; 4. First locking assembly; 41. First fixing member; 42. First elastic member; 43. First locking member; 431. First ring; 432. First locking block; 433. First sliding block; 5. Second locking assembly; 51. Second fixing member; 52. Second elastic member; 53. Second locking member; 54. Second locking block; 6. Stroke slide; 7. Stroke thread. Detailed Implementation

[0022] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] This invention provides a screw stroke positioner, such as... Figure 1 As shown, it includes: a rod body 1; a threaded section 11 is provided in the middle of the rod body 1; a first threaded ring 2 adapted to the threaded section 11 is rotatably provided at one end of the rod body 1, and a second threaded ring 3 adapted to the threaded section 11 is provided at the other end; the rod body 1 is also provided with a first locking component 4 for locking the first threaded ring 2 and a second locking component 5 for locking the second threaded ring 3; the threaded section 11, the first threaded ring 2 and the second threaded ring 3 form a travel thread 7; a travel slide 6 is threadedly connected to the travel thread 7; after the travel slide 6 moves to the limit position of the first threaded ring 2, the travel slide 6 presses the first locking component 4 to release the locking state of the first locking component 4 on the first threaded ring 2; after the travel slide 6 moves to the limit position of the second threaded ring 3, the travel slide 6 presses the second locking component 5 to release the locking state of the second locking component 5 on the second threaded ring 3.

[0026] In practical applications, when the first locking component 4 locks the first threaded ring 2 and the second locking component 5 locks the second threaded ring 3, it is difficult for both the first threaded ring 2 and the second threaded ring 3 to rotate with the rod body 1. The first threaded ring 2 is threadedly engaged with one end of the threaded segment 11, and the second threaded ring 3 is engaged with the other end of the threaded segment 11. As the rod body 1 continues to rotate, it drives the first locking component 4 and the second locking component 5 to rotate. The first locking component 4 drives the first threaded ring 2 to rotate, and the second locking component 5 drives the second threaded ring 3 to rotate, causing the travel thread 7 to rotate. This causes the travel slide 6 to slide on the travel thread 7. As the travel slide 6 slides to the limit point of the first threaded ring 2 (the end of the travel thread 7), the travel slide 6 gradually presses against the first locking component 4, changing the connection state between the first locking component 4 and the first threaded ring 2. The change means that the locking state of the first locking component 4 on the first threaded ring 2 is released. At this time, the first threaded ring 2 is in the unlocked state. Since the rod body 1 continues to rotate, the rod body 1 continues to drive the first locking component 4, the second locking component 5 and the threaded section 11 to rotate. However, since the first threaded ring 2 is in the unlocked state, the first threaded ring 2 does not rotate, so that the travel slide 6 on the first threaded ring 2 no longer continues to slide, thereby playing a limiting protection role, preventing the travel slide 6 from continuing to slide and causing wear between parts, and improving the service life of the product. When the rod body 1 rotates in the opposite direction, if the travel slide 6 slides to the limit position of the second threaded ring 3, the process of the travel slide 6 pressing the second locking component 5 to release the locking state of the second threaded ring 3 is the same as the process of the travel slide 6 pressing the first locking component 4 to release the locking state of the first threaded ring 2, which will not be described again here.

[0027] Furthermore, such as Figure 2 and Figure 3 As shown, the first locking component 4 is provided with a first locking block 432; the first locking block 432 is inclined at one end near the travel slide 6; the first threaded ring 2 is provided with a first locking through hole 221 adapted to the first locking block 432 for the first locking block 432 to extend out; the first locking block 432 is engaged with the first locking through hole 221; as shown Figure 4 and Figure 5 As shown, after the travel slide 6 moves to the limit position of the first threaded ring 2, the travel slide 6 presses the first locking block 432 to release the locking state between the first locking block 432 and the first locking through hole 221.

[0028] In practical applications, when the travel slide 6 has not slid to the limit position of the first threaded ring 2, the first locking block 432 engages with the first locking through hole 221 and partially extends out of the first locking through hole 221. When the rod 1 drives the first locking assembly 4 and the first threaded ring 2 to rotate, the travel slide 6 gradually slides towards the limit position of the first threaded ring 2. During this process, the travel slide 6 gradually approaches and presses the first locking block 432, causing the first locking block 432 to move downwards, such as... Figure 5 As shown, the first locking block 432 extends completely into the first locking hole 221, thus unlocking the first threaded ring 2. At this point, if the rotation direction of the rod 1 is clockwise when viewed from above, the first locking block 432 tilts downwards from right to left near the travel slider 6, and the first locking hole 221 matches the first locking block 432. When the rod 1 rotates clockwise, the rod 1 drives the first locking block 432 to gradually extend downwards from the first locking hole 221. If the rod 1 continues to rotate clockwise, the rod 1 drives the first locking block 432 to continue rotating. Since the travel slider 6 is located at the limit position of the first threaded ring 2, the first threaded ring 2 is unlocked and will not rotate due to the rotation of the rod 1. The travel slider 6 will not slide due to the rotation of the rod 1. When it is necessary to readjust the position of the travel slider 6, the control rod 1 is rotated in the opposite direction, that is, the control rod 1 is rotated counterclockwise when viewed from above. The rod 1 drives the first locking block 432 to rotate counterclockwise. After the first locking block 432 rotates in the opposite direction to the first locking hole 221, the right side wall of the first locking block 432 abuts against the side wall of the first locking hole 221, so that the reverse rotation of the first locking block 432 can drive the first threaded ring 2 to rotate in the opposite direction, thereby causing the travel slider 6 to slide in the opposite direction and gradually move away from the first locking component 4. This application can play a role in limiting the travel of the travel slider 6, strengthen the protection of the travel slider 6, and does not affect the subsequent reverse rotation of the travel slider 6 to adjust its position.

[0029] Furthermore, such as Figure 3 As shown, the first locking component 4 includes: a first fixing member 41, a first elastic member 42, and a first locking member 43; the first fixing member 41 is disposed on the rod body 1; the first locking member 43 is slidably disposed on the rod body 1 along the axial direction of the rod body 1; one end of the first elastic member 42 abuts against the first fixing member 41, and the other end abuts against the first locking member 43; the first snap-fit ​​block 432 is disposed on the first locking member 43.

[0030] Specifically, in this application, the first elastic element 42 is a spring; in other embodiments, the first elastic element 42 may be made of elastic materials such as silicone. The first fixing element 41 is ring-shaped. When the rod 1 rotates clockwise, causing the travel slide 6 to push the first locking block 432 downward, the first elastic element 42 is compressed. When the rod 1 rotates counterclockwise, causing the first locking block 432 to be located in the first locking hole 221, the first locking block 432 drives the first threaded ring 2 to rotate counterclockwise, causing the travel slide 6 to gradually rise. Under the elastic force of the first elastic element 42, the first locking element 43 also gradually rises, causing the first locking block 432 to gradually extend out of the first locking hole 221 and lock the first threaded ring 2. Through the setting of the first elastic element 42, when the rod 1 is rotated in the opposite direction, the first locking element 43 can relock the first threaded ring 2.

[0031] Furthermore, such as Figure 1 As shown, the first locking member 43 includes: a first ring body 431 and at least one first sliding block 433; the first sliding block 433 and the first locking block 432 are both disposed on the first ring body 431; the first ring body 431 is sleeved on the rod body 1; at least one first sliding groove 12 corresponding to at least one first sliding block 433 is axially opened on the rod body 1; the first sliding block 433 is slidably disposed on the first sliding groove 12.

[0032] Specifically, by setting the first sliding block 433 and the first sliding groove 12, the first locking member 43 is ensured to slide along the axial direction of the rod 1, preventing rotation between the first locking member 43 and the rod 1, thereby ensuring that the rotation of the rod 1 can drive the first locking member 43 to rotate.

[0033] Furthermore, such as Figure 1 and Figure 2 As shown, the first threaded ring 2 includes: a first cylindrical body 21 and a second ring body 22; the first cylindrical body 21 and the second ring body 22 are fixedly connected; the first cylindrical body 21 and the second ring body 22 are both sleeved on one end of the rod body 1; the first cylindrical body 21 is provided with a first thread 211; the threaded segment 11, the first thread 211 and the second threaded ring 3 form a stroke thread 7; the first snap-fit ​​through hole 221 is opened on the second ring body 22.

[0034] Specifically, the arrangement of the first cylinder 21 and the second ring 22 facilitates the first threaded ring 2 to be fitted onto the rod 1. When the first threaded ring 2 is in the unlocked state, rotation can occur between the first threaded ring 2 and the rod 1. When the first locking block 432 is located in the first locking through hole 221, the first thread 211 and one end of the threaded segment 11 are engaged, allowing the travel slide 6 to slide from the first thread 211 to the threaded segment 11 or from the threaded segment 11 to the first thread 211.

[0035] Furthermore, the second locking component 5 is provided with a second locking block 54; the end of the second locking block 54 near the travel slide 6 is inclined; the inclination direction of the end of the second locking block 54 near the travel slide 6 is opposite to the inclination direction of the end of the first locking block 432 near the travel slide 6; the second threaded ring 3 is provided with a second locking through hole adapted to the second locking block 54 for the second locking block 54 to extend out; the second locking block 54 is locked in the second locking through hole; after the travel slide 6 moves to the limit position of the second threaded ring 3, the travel slide 6 presses the second locking block 54 to release the locking state between the second locking block 54 and the second locking through hole.

[0036] Specifically, the first locking block 432 is located at the bottom end of the rod 1, and the second locking block 54 is located at the top end of the rod 1. Since the inclination direction of the end of the second locking block 54 near the travel slider 6 is opposite to the inclination direction of the end of the first locking block 432 near the travel slider 6, when the rod 1 moves counterclockwise, the travel slider 6 moves upward until it pushes the portion of the second locking block 54 extending out of the second locking hole completely into the second locking hole. The rod 1 continues to move counterclockwise, causing the rod 1 to rotate the second locking block 54 to completely slide out of the second locking hole, releasing the locking state of the second threaded ring 3, preventing the second threaded ring 3 from rotating, and stopping the travel slider 6 from sliding upward. When it is necessary to adjust the position of the travel slider 6, the rod 1 is rotated clockwise so that the second locking block 54 is located in the second locking hole. Figure 1 As shown, the right side wall of the second locking block 54 abuts against the second locking through hole, causing the second locking block 54 to drive the second threaded ring 3 to rotate clockwise, thereby causing the travel slide 6 to slide downward.

[0037] Furthermore, such as Figure 1 As shown, the second locking component 5 includes: a second fixing member 51, a second elastic member 52, and a second locking member 53; the second fixing member 51 is disposed on the rod body 1; the second locking member 53 is slidably disposed on the rod body 1 along the axial direction of the rod body 1; one end of the second elastic member 52 abuts against the second fixing member 51, and the other end abuts against the second locking member 53; the second snap-fit ​​block 54 is disposed on the second locking member 53.

[0038] Specifically, in this application, the second elastic element 52 is a spring, while in other embodiments, the second elastic element 52 may be made of elastic materials such as silicone. The second fixing element 51 is ring-shaped. When the rod 1 rotates counterclockwise, causing the travel slide 6 to push the second locking block 54 upward, the second elastic element 52 is compressed. When the rod 1 rotates clockwise, causing the second locking block 54 to be located in the second locking hole, the second locking block 54 drives the second threaded ring 3 to rotate clockwise, causing the travel slide 6 to gradually descend. Under the elastic force of the second elastic element 52, the second locking element 53 also gradually descends, causing the second locking block 54 to gradually extend out of the second locking hole and lock the second threaded ring 3. Through the setting of the second elastic element 52, when the rod 1 is rotated clockwise, the second locking element 53 can relock the second threaded ring 3.

[0039] Further, the second locking member 53 includes: a third ring body and at least one second sliding block; the second sliding block and the second locking block 54 are both disposed on the third ring body; the third ring body is sleeved on the rod body 1; at least one second sliding groove 13 corresponding to at least one second sliding block is axially opened on the rod body 1; the second sliding block is slidably disposed on the second sliding groove 13.

[0040] Specifically, the inclination direction of the second locking block 54 near the end of the travel slide 6 is opposite to that of the first locking block 432 near the end of the travel slide 6. This means that when the first locking member 43 and the second locking member 53 are arranged opposite to each other, the inclination direction of the first locking block 432 near the end of the travel slide 6 is gradually approaching the first ring body 431 from left to right, and the inclination direction of the second locking block 54 near the end of the travel slide 6 is gradually approaching the third ring body from right to left. Through the arrangement of the second sliding block and the second sliding groove 13, it is ensured that the second locking member 53 slides along the axial direction of the rod body 1, preventing rotation between the second locking member 53 and the rod body 1, thereby ensuring that the rotation of the rod body 1 can drive the second locking member 53 to rotate.

[0041] Further, the second threaded ring 3 includes: a second cylindrical body 31 and a fourth ring body 32; the second cylindrical body 31 and the fourth ring body 32 are fixedly connected; the second cylindrical body 31 and the fourth ring body 32 are both sleeved on the other end of the rod body 1; a second thread 311 is provided on the second cylindrical body 31; the threaded segment 11, the first thread 211 and the second thread 311 form a stroke thread 7; the second snap-fit ​​through hole is opened on the fourth ring body 32.

[0042] Specifically, the second cylinder 31 and the fourth ring 32 facilitate the second threaded ring 3 to be fitted onto the rod 1. When the second threaded ring 3 is in the unlocked state, rotation can occur between the second threaded ring 3 and the rod 1. When the second locking block 54 is located in the second locking through hole, the other end of the second thread 311 and the threaded section 11 are engaged, allowing the travel slide 6 to slide from the second thread 311 to the threaded section 11 or from the threaded section 11 to the second thread 311.

[0043] The screw stroke positioner of the present invention, through the cooperation of the first locking component 4 and the first threaded ring 2, and the cooperation of the second locking component 5 and the second threaded ring 3, provides a limiting protection for the stroke slide 6, preventing the stroke slide 6 from continuing to slide to both ends and causing wear between parts, thereby improving the service life of the product.

[0044] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A screw stroke positioner, characterized in that, include: A rod body; a threaded section is provided in the middle of the rod body; a first threaded ring adapted to the threaded section is rotatably provided at one end of the rod body, and a second threaded ring adapted to the threaded section is provided at the other end; the rod body is also provided with a first locking component for locking the first threaded ring and a second locking component for locking the second threaded ring; the threaded section, the first threaded ring, and the second threaded ring form a travel thread; a travel slide is threadedly connected to the travel thread; after the travel slide moves to the limit position of the first threaded ring, the travel slide presses the first locking component to release the locking state of the first locking component on the first threaded ring; after the travel slide moves to the limit position of the second threaded ring, the travel slide presses the second locking component to release the locking state of the second locking component on the second threaded ring; The first locking component is provided with a first locking block; the end of the first locking block near the travel slide is inclined; the first threaded ring is provided with a first locking through hole adapted to the first locking block for the first locking block to extend out; the first locking block is locked into the first locking through hole; after the travel slide moves to the limit position of the first threaded ring, the travel slide presses the first locking block to release the locking state between the first locking block and the first locking through hole.

2. The screw stroke positioner according to claim 1, characterized in that, The first locking assembly includes: a first fixing member, a first elastic member, and a first locking member; the first fixing member is disposed on the rod body; the first locking member is slidably disposed on the rod body along the axial direction of the rod body; one end of the first elastic member abuts against the first fixing member, and the other end abuts against the first locking member; the first snap-fit ​​block is disposed on the first locking member.

3. The screw stroke positioner according to claim 2, characterized in that, The first locking element includes: a first ring body and at least one first sliding block; the first sliding block and the first locking block are both disposed on the first ring body; the first ring body is sleeved on the rod body; the rod body is axially provided with at least one first sliding groove corresponding to at least one first sliding block; the first sliding block is slidably disposed on the first sliding groove.

4. The screw stroke positioner according to claim 1, characterized in that, The first threaded ring includes: a first cylindrical body and a second ring body; the first cylindrical body and the second ring body are fixedly connected; the first cylindrical body and the second ring body are both sleeved on one end of the rod body; the first cylindrical body is provided with a first thread; the threaded segment, the first thread and the second threaded ring form a stroke thread; the first snap-fit ​​hole is opened on the second ring body.

5. The screw stroke positioner according to any one of claims 1-4, characterized in that, The second locking component is provided with a second locking block; the end of the second locking block near the travel slide is inclined; the inclination direction of the end of the second locking block near the travel slide is opposite to the inclination direction of the end of the first locking block near the travel slide; the second threaded ring is provided with a second locking through hole adapted to the second locking block for the second locking block to extend out; the second locking block is locked into the second locking through hole; after the travel slide moves to the limit position of the second threaded ring, the travel slide presses the second locking block to release the locking state between the second locking block and the second locking through hole.

6. The screw stroke positioner according to claim 5, characterized in that, The second locking assembly includes: a second fixing member, a second elastic member, and a second locking member; the second fixing member is disposed on the rod body; the second locking member is slidably disposed on the rod body along the axial direction of the rod body; one end of the second elastic member abuts against the second fixing member, and the other end abuts against the second locking member; the second snap-fit ​​block is disposed on the second locking member.

7. The screw stroke positioner according to claim 6, characterized in that, The second locking element includes: a third ring body and at least one second sliding block; the second sliding block and the second locking block are both disposed on the third ring body; the third ring body is sleeved on the rod body; the rod body has at least one second sliding groove axially formed corresponding to at least one second sliding block; the second sliding block is slidably disposed on the second sliding groove.

8. The screw stroke positioner according to claim 5, characterized in that, The second threaded ring includes: a second cylindrical body and a fourth ring body; the second cylindrical body and the fourth ring body are fixedly connected; the second cylindrical body and the fourth ring body are both sleeved on the other end of the rod body; a second thread is provided on the second cylindrical body; the threaded segment, the first threaded ring and the second thread form a stroke thread; the second snap-fit ​​hole is opened on the fourth ring body.

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