Spring lead screw pair
By designing a spring screw pair that automatically adjusts the guide, the problem of large torque changes during valve switching is solved, and the effect of continuously variable speed and resource saving is achieved.
Patent Information
- Application Number
- CN202422043380.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-08-21
AI Technical Summary
During the valve switching process, the required torque changes greatly, resulting in a large need for a large drive device and waste of resources.
A spring lead screw pair is designed, and its lead screw lead can be automatically changed according to the magnitude of the transmitted torque, thereby changing the relative movement speed of the screw and the wire master to achieve continuous speed change.
By automatically adjusting the lead screw lead, a relatively small drive device can be selected when different torques are transmitted, reducing waste and achieving quick switch of the valve.
Smart Images
Figure CN222925055U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of variable lead screws, and particularly relates to a spring screw pair. Background Art
[0002] In occasions where the external force or torque transmitted is unstable, such as in the valve field, during the entire opening and closing process of a gate valve, the required torque changes greatly. At the end of closing the gate valve or at the moment of opening the gate valve, the required torque is the largest. During other periods of the closing or opening process of the gate valve, the required torque is generally only about 20% of the maximum torque. However, when engineers select the driving mechanism of the gate valve, in order to be able to open and close the valve normally, they have to select the driving device according to the maximum torque required by the gate valve, which causes a great waste. Content of the Utility Model
[0003] The purpose of the utility model: The utility model provides a spring screw pair, the lead of the screw of which can automatically change according to the magnitude of the transmitted torque, so as to change the relative moving speed of the screw and the nut, realize stepless speed change, and thus can meet the requirement of realizing the transmission of different torques with a smaller driving power during the valve opening and closing process, reducing waste.
[0004] To achieve the above purpose, the technical solution of the utility model is as follows:
[0005] A spring screw pair includes a spring nut and a spring screw, and the spring nut is movably sleeved on the spring screw;
[0006] The spring nut includes a nut outer ring and a first helical spring, and the first helical spring is installed in the nut outer ring; the spring screw includes a central shaft, and a second helical spring is sleeved and limited on the central shaft.
[0007] As an improvement: One end of the first helical spring is fixed in the nut outer ring, and the other end can freely stretch.
[0008] As an improvement: A first positioning end ring and a second positioning end ring are respectively arranged at two sections of the central shaft. A first anti-rotation positioning ring is arranged on the first positioning end ring, and a second anti-rotation positioning ring is arranged on the second positioning end ring. One end of the second helical spring is limited on the first anti-rotation positioning ring, and the other end is limited on the second anti-rotation positioning ring.
[0009] As an improvement: The cross-sectional shape of the wire of the first helical spring is the same as that of the wire of the second helical spring.
[0010] As an improvement: The cross-sectional shape of the wire of the first helical spring includes any one of trapezoid, rectangle, triangle or circle.
[0011] As an improvement: the mean diameter of the first helical spring is equal to that of the second helical spring.
[0012] In summary, the utility model has the following beneficial effects:
[0013] The spring wire nut moves relatively on the spring lead screw. When the external force acting on the spring lead screw increases, the lead of the first helical spring and the second helical spring decreases synchronously, keeping the relative rotational speed of the spring nut unchanged. Then the axial relative movement speed of the spring lead screw and the spring wire nut will slow down, and a greater external force or torque can be transmitted. When the external force acting on the spring lead screw decreases, the lead of the first helical spring and the second helical spring will increase synchronously, and the relative movement speed of the spring lead screw pair will increase, so as to realize the rapid opening and closing of the valve. When applied to the opening and closing of the valve, it can meet the requirement of selecting a relatively small driving device according to needs and reduce waste. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below.
[0015] Figure 1 It is a schematic diagram of the overall structure of a spring lead screw pair;
[0016] Figure 2 It is Figure 1 a schematic diagram of the structure of part A in
[0017] Figure 3 a schematic diagram of the overall structure of the spring wire nut;
[0018] Figure 4 a schematic diagram of the overall structure of the spring lead screw;
[0019] Wherein: 1. Spring wire nut; 2. Spring lead screw; 3. Nut outer ring; 4. First helical spring; 5. Central axis; 6. Second helical spring; 7. First positioning end ring; 8. Second positioning end ring; 9. First anti-rotation positioning ring; 10. Second anti-rotation positioning ring. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The present utility model will be further described in detail below with reference to the drawings.
[0021] Please refer to Figures 1-4 , a spring lead screw pair, comprising a spring wire nut 1 and a spring lead screw 2, and the spring wire nut 1 is movably sleeved on the spring lead screw 2;
[0022] The spring wire nut 1 includes a nut outer ring 3 and a first helical spring 4, and the first helical spring 4 is installed in the nut outer ring 3; the spring lead screw 2 includes a central axis 5, and a second helical spring 6 is sleeved and limited on the central axis 5.
[0023] One end of the first helical spring 4 is fixed inside the outer ring of the nut 3, and the other end is free to expand and contract.
[0024] At both ends of the central shaft 5, a first positioning end ring 7 and a second positioning end ring 8 are respectively provided. A first anti-rotation positioning ring 9 is provided on the first positioning end ring 7, and a second anti-rotation positioning ring 10 is provided on the second positioning end ring 8. One end of the second helical spring 6 is limited by the first anti-rotation positioning ring 9, and the other end is limited by the second anti-rotation positioning ring 10. In this embodiment, the second helical spring 6 can only axially expand and contract along the central shaft 5 but cannot rotate through the two anti-rotation positioning rings.
[0025] The cross-sectional shape of the wire of the first helical spring 4 is the same as that of the wire of the second helical spring 6. The cross-sectional shape of the wire of the first helical spring 4 includes any one of trapezoid, rectangle, triangle or circle. The pitch diameter of the first helical spring 4 is equal to that of the second helical spring 6, and the two can form a pair of screw-thread lead screw pairs.
[0026] Principle of operation: After the spring nut 1 and the spring lead screw 2 are assembled together, a pair of lead screw pairs is formed. By rotating the outer ring of the nut 3, relative movement can be made on the spring lead screw 2. If a certain external force is applied to the spring lead screw 2 while the spring nut 1 is axially relatively fixed, then when the spring nut 1 is rotated to drive the spring lead screw 2 to move, a relative extrusion force will be generated between the first helical spring 4 and the second helical spring 6 to overcome the external force acting on the spring lead screw 2.
[0027] As the external force acting on the spring lead screw 2 increases and the anti-deformation ability of the current first helical spring 4 itself is not sufficient to overcome the external force applied to the spring lead screw 2, the length of the first helical spring 4 of the spring nut 1 will contract and move towards the fixed end of the first helical spring 4, thereby reducing the lead of the first helical spring 4. At this time, the lead of the part of the second helical spring 6 on the spring lead screw 2 that cooperates with the spring nut 1 also decreases accordingly until it can overcome the external force acting on the spring lead screw 2. Then, relative movement continues to occur between the spring lead screw 2 and the spring nut 1 to achieve the purpose of transmitting external force or displacement.
[0028] When the spring nut 1 rotates to make relative movement on the spring lead screw 2 and the external force acting on the spring lead screw 2 increases, the leads of the first helical spring 4 and the second helical spring 6 decrease synchronously, keeping the relative rotational speed of the spring nut unchanged. The axial relative movement speed of the spring lead screw 2 and the spring nut 1 will slow down, and a greater external force or torque can be transmitted. When the external force acting on the spring lead screw 2 decreases, the leads of the first helical spring 4 and the second helical spring 6 will increase synchronously, and the relative movement speed of the lead screw pair will increase, thereby enabling the rapid opening and closing of the valve. When applied to the opening and closing of the valve, it can meet the requirement of selecting a relatively small driving device according to needs and reduce waste.
[0029] This design can be applied to occasions where the external force or torque transmitted is unstable. With a relatively small driving power, the transmission of different torques can be achieved. For example, gate valves in the valve field. During the entire opening and closing process of a gate valve, the required torque changes significantly. At the end of closing the gate valve or at the moment of opening the gate valve, the required torque is the largest. During other periods of the closing or opening process of the gate valve, the required torque is generally only about 20% of the maximum torque. However, when engineers select the driving mechanism of a gate valve, in order to be able to open and close the valve normally, they have to select the driving device according to the maximum torque required by the gate valve, which causes a great waste. By applying this design, a relatively small driving device can be selected as needed. When the torque required by the gate valve is the largest, the lead of the spring screw pair 2 is the smallest, the relative moving speed is slower, and the output torque is the largest, smoothly opening or closing the gate valve. During other periods of the gate valve opening and closing process, when the required torque becomes smaller, the lead of the screw pair becomes larger, quickly closing or opening the gate valve.
[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that; still, the specific implementation manners of the present invention can be modified or some technical features can be equivalently replaced; without departing from the spirit of the technical solutions of the present invention, they should all be covered by the scope of the technical solutions claimed by the present invention.
Claims
1. A spring screw pair, characterized in that: It comprises a spring nut and a spring lead screw, wherein the spring nut is movably sleeved on the spring lead screw; The spring nut includes a nut outer ring and a first coil spring, and the first coil spring is installed in the nut outer ring; the spring screw includes a central axis, and a second coil spring is sleeved and limited on the central axis.
2. The spring screw pair according to claim 1, characterized in that: One end of the first coil spring is fixed in the outer ring of the nut, and the other end thereof can be freely extended and retracted.
3. The spring screw pair according to claim 1, characterized in that: A first positioning end ring and a second positioning end ring are respectively provided at the two sections of the central axis, a first anti-rotation positioning ring is provided on the first positioning end ring, and a second anti-rotation positioning ring is provided on the second positioning end ring, one end of the second coil spring is limited on the first anti-rotation positioning ring, and the other end thereof is limited on the second anti-rotation positioning ring.
4. The spring screw pair according to claim 1, characterized in that: The cross-sectional shape of the steel wire of the first coil spring is the same as the cross-sectional shape of the steel wire of the second coil spring.
5. The spring screw pair according to claim 4, characterized in that: The cross-sectional shape of the steel wire of the first coil spring includes any one of trapezoidal, rectangular, triangular or circular.
6. The spring screw pair according to claim 4, characterized in that: The median diameter of the first coil spring is equal to the median diameter of the second coil spring.