Variable lead screw pair
By designing different leads in different parts of the variable lead screw, and using the relative movement between the spring wire master and the variable lead screw, different forces or torques are transmitted in different parts, solving the problem that traditional spiral lead screws cannot meet the needs of modern manufacturing, and achieving efficient utilization of resources.
Patent Information
- Application Number
- CN202422043408.9
- 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
Traditional spiral lead screws cannot meet the modern manufacturing industry's demand for different forces or torques to be transmitted in different parts, especially in the valve switching process. The prior art is difficult to effectively utilize smaller driving power to achieve the transmission of different torques, resulting in waste of resources.
A variable-guided lead screw pair is designed. By designing different leads in different parts of the same screw, and using the relative movement between the spring wire master and the variable-guided lead screw, different forces or torques are transmitted at different parts. At the same time, different movement speeds between the screw and the wire master are achieved under the same driving speed.
It realizes the transmission of different external forces or movement speeds at different stages, reduces the waste of driving power, and can achieve the transmission of different torques with a smaller driving power, which is suitable for valve switches and other scenarios.
Smart Images
Figure CN222925056U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of variable lead screws, and particularly relates to a variable lead 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 great waste. And in occasions where movement needs to be transmitted, traditional screw jacks can only transmit a constant moving speed and cannot meet the special needs of modern manufacturing. Content of the Utility Model
[0003] The purpose of the utility model: The utility model provides a variable lead screw pair, which designs different parts of the same screw to have different leads, and the different leads between each part are smoothly transitioned. It can realize the transmission of different forces or torques at different parts, and can also realize that at the same driving speed, at parts with different leads, the moving speeds between the screw and the nut are different, so as to meet different transmission technical requirements. For example, it can meet the requirement of transmitting different torques with a smaller driving power during the opening and closing process of the valve, reducing waste.
[0004] To achieve the above purpose, the technical solution of the utility model is as follows:
[0005] A variable lead screw pair includes a spring nut and a variable lead screw, and the spring nut is movably sleeved on the variable lead screw;
[0006] The spring nut includes a nut outer ring and a helical spring. The helical spring is installed inside the nut outer ring, and the helical spring is located in the helical groove between the nut outer ring and the variable lead screw.
[0007] As an improvement: One end of the helical spring is fixed on the upper nut outer ring, and the other end can freely expand and contract.
[0008] As an improvement: The cross-sectional shape of the helical spring is adapted to the cross-sectional shape of the helical groove of the variable lead screw.
[0009] As an improvement: The cross-sectional shape of the helical spring includes any one of trapezoid, rectangle, triangle or circle.
[0010] As an improvement: The helical spring can freely expand and contract axially as the variable lead screw rotates.
[0011] In summary, the utility model has the following beneficial effects:
[0012] When a driving external force with constant power is applied to the spring nut, at the part of the variable pitch lead screw with a larger lead, the relative movement between the variable pitch lead screw and the spring nut is faster, and the force that can be transmitted is smaller; conversely, at the part of the variable pitch lead screw with a smaller lead, the relative movement between the variable pitch lead screw and the spring nut is slower, but the force that can be transmitted is larger. Therefore, it can be applied to occasions where different external forces need to be transmitted in different stages, or different moving speeds need to be transmitted in different stages. During the closing process of the gate valve, by using this device, different torques can be transmitted with a smaller driving power. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art.
[0014] Figure 1 It is a schematic diagram of the overall structure of the variable pitch lead screw pair;
[0015] Figure 2 It is Figure 1 a schematic diagram of the structure of part A in
[0016] Figure 3 a schematic diagram of the overall structure of the spring nut;
[0017] Figure 4 It is Figure 3 a schematic diagram of the structure of part B in
[0018] Figure 5 a schematic diagram of the overall structure of the variable pitch lead screw;
[0019] Figure 6 It is Figure 5 a schematic diagram of the structure of part C in
[0020] Among them: 1. Spring nut; 2. Variable pitch lead screw; 3. Nut outer ring; 4. Helical spring. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] The following will further describe the present utility model in detail with reference to the drawings.
[0022] Please refer to Figures 1-2 , a variable pitch lead screw pair includes a spring nut 1 and a variable pitch lead screw 2. The spring nut 1 is movably sleeved on the variable pitch lead screw 2. When a driving external force is applied to the spring nut 1, the spring nut 1 can make a relative movement on the variable pitch lead screw 2;
[0023] Please refer to Figures 3-4, the spring nut 1 includes a nut outer ring 3 and a helical spring 4. The helical spring 4 is installed inside the nut outer ring 3 and is located in the thread groove between the nut outer ring 3 and the variable pitch lead screw 2.
[0024] One end of the helical spring 4 is fixed on the upper nut outer ring 3, and the other end can freely expand and contract. In this embodiment, after the spring nut and the variable pitch lead screw 2 are assembled together, a pair of variable pitch lead screw 2 pairs are formed. Since the helical spring 4 in the spring nut 1 has elasticity, it can freely expand and contract along the axial direction. Therefore, although the lead of the variable pitch lead screw 2 is variable, the spring nut 1 can also be well matched with the variable pitch lead screw.
[0025] The cross-sectional shape of the helical spring 4 is adapted to the cross-sectional shape of the helical groove of the variable pitch lead screw 2. The cross-sectional shape of the helical spring 4 includes any one of trapezoid, rectangle, triangle or circle. The helical spring 4 can freely expand and contract axially as the variable pitch lead screw 2 rotates, so as to adapt to different lead changes.
[0026] Please refer to Figures 1-6 , in this embodiment, the cross-sectional shapes of the helical spring 4 and the thread profile cross-section of the variable pitch lead screw 2 are both trapezoidal. Its operating principle: Rotating the spring nut 1 can make relative movement on the variable pitch lead screw 2. At different parts of the variable pitch lead screw 2, due to different leads, the force or the effect of motion that can be transmitted is also different. Suppose a driving external force with constant power is applied to the spring nut 1. At the part of the variable pitch lead screw 2 with a larger lead, the relative movement between the variable pitch lead screw 2 and the spring nut 1 is faster, and the force that can be transmitted is smaller; on the contrary, at the part of the variable pitch lead screw 2 with a smaller lead, the relative movement between the variable pitch lead screw 2 and the spring nut 1 is slower, but the force that can be transmitted is larger. And when the spring nut 1 and the variable pitch lead screw 2 maintain a fixed relative rotational speed, different relative movement speeds can be transmitted at different lead positions.
[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended 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; it is still possible to modify the specific implementation manners of the present invention or make equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.
Claims
1. A variable lead screw pair, characterized in that: It comprises a spring nut and a variable lead screw, wherein the spring nut can be movably sleeved on the variable lead screw; The spring nut comprises a nut outer ring and a coil spring. The coil spring is installed inside the nut outer ring and is located in a spiral groove between the nut outer ring and the variable lead screw.
2. The variable lead screw pair according to claim 1, characterized in that: One end of the coil spring is fixed on the outer ring of the upper nut, and the other end of the coil spring can be freely extended and retracted.
3. The variable lead screw pair according to claim 1, characterized in that: The cross-sectional shape of the coil spring is matched with the cross-sectional shape of the spiral groove of the variable lead screw.
4. The variable lead screw pair according to claim 3, characterized in that: The cross-sectional shape of the coil spring includes any one of a trapezoid, a rectangle, a triangle or a circle.
5. The variable lead screw pair according to claim 1, characterized in that: The coil spring can freely expand and contract in the axial direction as the variable lead screw rotates.