Rotation angle limiting device with maximum limiting angle larger than 360 degrees
By designing a rotation angle limiting device including a rotating shaft, a cam, a limit seat and an electrical limit switch, the problem of difficulty in realizing a rotation angle limit of more than 360° in the prior art is solved, and the electromechanical dual limiting function is realized, which is universal and cost-effective.
Patent Information
- Application Number
- CN202421864117.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-08-02
AI Technical Summary
It is difficult to design a rotation angle limiting device with a maximum limiting angle greater than 360°, which can simultaneously realize electromechanical limiting function, be universal, have simple structure, low cost and easy to apply.
By designing a rotation angle limiting device including a rotating shaft, a cam, a limit seat and an electrical limit switch, the toggle pin cooperates with the limit steps on the cam to drive the cam rotation, and mechanical and electrical limits are achieved through the limit block and the convex column.
It realizes the rotation angle limit function with a maximum limit angle greater than 360°, and can perform electromechanical limits at the same time. It is universal, simple in structure, low in cost, and easy to apply, meeting various application needs.
Smart Images
Figure CN222798005U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a rotation angle limiting device, in particular to a rotation angle limiting device with a maximum limiting angle greater than 360 degrees. Background Art
[0002] In equipment involving shaft rotation, limiting the rotation angle of the shaft is a common function. For example, in the field of servo turntables, in order to ensure the safety of the robot arm joints (or rotary drive components), it is generally necessary to set electronic limits and mechanical limits on the robot arm joints, but usually the range of the limit angle is less than or equal to 360°, that is, within a full circle.
[0003] In practical applications, there is also a need to limit the rotation angle of equipment with a rotation angle greater than 360°. For example, the support platform of an astronomical telescope requires a rotation function of more than 360° to achieve continuous observation. The limiting angle range of the rotation angle limiting device in such equipment should also be greater than 360°.
[0004] In the current patent literature, the limit devices that can achieve a rotation angle of more than 360° are either not universal because they are designed for the structure of specific equipment, or have only mechanical or electrical limit functions, or have complex structures that result in high costs and inconvenience in application. It is difficult to simultaneously achieve the electromechanical limit (i.e., mechanical limit and electrical limit) functions, have the advantages of universality, simple structure, low cost, and easy application. Utility Model Content
[0005] The purpose of the utility model is to provide a rotation angle limit device with a maximum limit angle greater than 360° in order to solve the above problems. The device can simultaneously realize the electromechanical limit function, has the advantages of universality, simple structure, low cost and easy application.
[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:
[0007] A rotation angle limiting device with a maximum limiting angle greater than 360° comprises a rotating shaft and a limiting seat, and also comprises a cam, wherein the cam is rotatably connected to one end of the rotating shaft through a connecting shaft, the circumferential outer wall surface of the cam comprises a section of an arc-shaped large-diameter arc outer wall surface and a section of an arc-shaped small-diameter arc outer wall surface, the center of the large-diameter arc outer wall surface and the center of the small-diameter arc outer wall surface coincide with each other and the connecting shaft passes through the center of the circle, the radius of the large-diameter arc outer wall surface is greater than the radius of the small-diameter arc outer wall surface, and the two ends of the large-diameter arc outer wall surface correspond to the two ends of the small-diameter arc outer wall surface to form an "L"-shaped limiting The shaft is provided with a toggle pin and the toggle pin can be blocked by the two limit steps respectively during the positive and negative rotation of the shaft. The outer wall surface of the large-diameter arc is provided with a convex column extending in the peripheral direction. The limit seat is located next to the cam. The limit seat is provided with a raised limit block. The limit seat is provided with a first electrical limit switch and a second electrical limit switch at the positions on the opposite sides of the limit block. The convex column can contact the first trigger member of the first electrical limit switch and the second trigger member of the second electrical limit switch during the process of being pushed and rotated by the toggle pin and can contact the opposite sides of the limit block. The above-mentioned electrical limit switch can select conventional components of the prior art according to actual needs, such as travel switches, contact sensors, etc., which can realize this function.
[0008] Preferably, in order to facilitate assembly and application, the two limit steps are both located within the range of the corresponding end faces of the rotating shaft, and the connecting shaft passes through the center position of the corresponding end faces of the rotating shaft.
[0009] Preferably, in order to facilitate assembly, the connecting shaft is a connecting screw, and the stud of the connecting screw passes through the central through hole of the pressure plate and the central through hole of the cam in sequence and then is connected to the screw hole at the center position of the corresponding end face of the rotating shaft.
[0010] Preferably, in order to make the cooperation between the limit block and the boss more reliable and to maximize the rotatable angle of the cam, the two opposite side surfaces of the limit block are both planes and are arranged in an "eight" shape with each other, and the spacing at one end close to the cam is smaller than the spacing at the other end. The two opposite side surfaces of the boss are planes and are in surface contact with the corresponding sides of the limit block.
[0011] The beneficial effects of the utility model are:
[0012] The utility model designs a rotating shaft, a cam, a limit seat and an electrical limit switch that cooperate with each other, and utilizes the cooperation between a toggle pin arranged on the rotating shaft and two limit steps on the cam, so that during the rotation process of the rotating shaft rotating at a maximum angle exceeding 360°, the cam is pushed to rotate an angle less than 360°, and then the boss is blocked by the limit block to realize the mechanical limit function, and the electrical limit switch is triggered by the boss to realize the electrical limit function, which can realize the electromechanical dual limit function at the same time and has the advantages of universality, simple structure, low cost and easy application; if the width of the limit block and the central angle corresponding to the outer wall surface of the large-diameter circular arc of the cam are designed to be small enough, and the relative positions of the rotating shaft, the cam and the limit block before rotation are adjusted, the utility model can realize the rotation angle limit function with an ultra-large limit angle range of a minimum of close to 0° and a maximum of close to 720°, which can well meet various application requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a three-dimensional diagram of the rotation angle limiting device of the utility model with a maximum limiting angle greater than 360°;
[0014] Figure 2 It is one of the main views when the rotation angle limiting device with a maximum limiting angle greater than 360° described in the utility model is used;
[0015] Figure 3 This is the second main view of the rotation angle limiting device of the utility model with a maximum limiting angle greater than 360° when in use. DETAILED DESCRIPTION
[0016] The utility model is further described below in conjunction with the accompanying drawings:
[0017] like Figure 1As shown, the rotation angle limiting device with a maximum limiting angle greater than 360° of the utility model comprises a rotating shaft 3, a limiting seat 1 and a cam 6, the cam 6 is rotatably connected to one end of the rotating shaft 3 through a connecting shaft (refer to the connecting screw 12 described below), the circumferential outer wall surface of the cam 6 comprises a section of an arc-shaped large-diameter arc outer wall surface (not separately marked in the figure) and a section of an arc-shaped small-diameter arc outer wall surface (not separately marked in the figure), the center of the large-diameter arc outer wall surface and the center of the small-diameter arc outer wall surface coincide with each other and the connecting shaft passes through the center, the radius of the large-diameter arc outer wall surface is greater than the radius of the small-diameter arc outer wall surface, and the two ends of the large-diameter arc outer wall surface are aligned with the small-diameter arc outer wall surface. The two ends of the shaft 3 correspond to form "L"-shaped limit steps 5 respectively, and a toggle pin 13 is provided on the shaft 3, and the toggle pin 13 can be blocked by the two limit steps 5 respectively during the positive and negative rotation of the shaft 3. The surface of the outer wall of the large-diameter arc is provided with a boss 11 extending in the circumferential direction. The limit seat is located next to the cam, and a raised limit block 7 is provided on the limit seat 1. The first electrical limit switch 2 and the second electrical limit switch 10 are respectively provided at the positions on the opposite sides of the limit block 7 on the limit seat 1. The boss 11 can contact the first trigger member 4 of the first electrical limit switch 2 and the second trigger member 9 of the second electrical limit switch 10 during the process of being pushed and rotated by the toggle pin 13, and can contact the opposite sides of the limit block 7.
[0018] Preferably, in order to facilitate assembly and application, the two limit steps 5 are located within the corresponding end face range of the rotating shaft 3, and the connecting shaft passes through the center position of the corresponding end face of the rotating shaft 3; in order to facilitate assembly, the connecting shaft is a connecting screw 12, and the stud of the connecting screw 12 passes through the center through hole of the pressure plate 8 and the center through hole of the cam 6 in turn and is connected to the screw hole (not visible in the figure) at the center position of the corresponding end face of the rotating shaft 3; in order to make the cooperation between the limit block 7 and the boss 11 more reliable and to maximize the rotatable angle of the cam 6, the opposite side surfaces of the limit block 7 are both planes and are arranged in an "eight" shape with each other, and the spacing at one end close to the cam 6 is smaller than the spacing at the other end, and the opposite side surfaces of the boss 11 are planes and the surfaces are in surface contact with the corresponding sides of the limit block 7.
[0019] like Figure 2 and Figure 3As shown, when in use, the rotating shaft 3 is directly used as the rotating shaft of the operating equipment (not shown in the figure) that needs to limit the rotation angle, or the rotating shaft 3 is connected to the rotating shaft of the operating equipment that needs to limit the rotation angle, and the limit seat 1 is installed at a suitable position next to the rotating shaft 3, and the relative positions between the rotating shaft 3, the cam 6 and the limit block 7 are adjusted. The adjustment method can be to rotate the rotating shaft 3, or to remove the rotation direction of the cam 6 and then install it, or to change the position of the limit seat 1. The specific adjustment plan is determined according to the actual required limit angle and which parts are easy to adjust; before operation, the signal output end of the first electrical limit switch 2 and the second electrical limit switch 10 must be connected to the corresponding controller (the controller is the controller of the operating equipment or an independent controller) to serve as the signal input of the electrical limit protection. The following is a specific description of the application scenarios with the maximum forward and reverse rotation of the limit angle, the limit angle close to the minimum, and the limit angle slightly less than 360°.
[0020] like Figure 2 As shown, the initial position before rotation is adjusted to a position where the boss 11 contacts the first trigger member 4 of the first electrical limit switch 2 and the corresponding side of the limit block 7, and the push pin 13 contacts the limit step 5 close to the first trigger member 4; then the shaft 3 is pressed Figure 2 , when the boss 11 is separated from the first trigger member 4, the first electrical limit switch 2 outputs a signal to the controller. The signal is generally ineffective, but may be useful for some specific application scenarios. Before the shaft 3 contacts the other limit step 5, the cam 6 rotates freely under its own gravity, and the rotation of the shaft 3 is not affected by the cam 6. After the shaft 3 contacts the other limit step 5, the shaft 3 will push the cam 6 to rotate synchronously under the blocking effect of the limit step 5, and the boss 11 rotates synchronously with the cam 6. The shaft 3 continues to rotate, and when the boss 11 contacts the second trigger member 9 of the second electrical limit switch 10, the second electrical limit switch 10 outputs a signal to the controller. The controller obtains a signal that the angle limit limit position has been reached, and starts the relevant electrical control function. The shaft 3 stops rotating to realize the electrical limit function. If the electrical limit function fails, the boss 11 continues to rotate until it contacts the other side of the limit block 7. The boss 11 is blocked by the limit block 7 and cannot continue to rotate, thereby realizing the mechanical limit function. In general, the mechanical limit function is used as a safeguard when the electrical limit function fails, realizing a dual limit protection function to ensure that the running equipment will not be damaged. The counterclockwise rotation angle of this rotation angle limit is about 440°, which is an application scenario greater than 360°. If the width of the limit block 7 and the central angle corresponding to the outer wall surface of the large diameter arc of the cam 6 are designed to be small enough, the angle can be close to 720°.
[0021] like Figure 3 As shown, Figure 2The operation process and working principle are similar, except that the counterclockwise rotation is changed to clockwise rotation, and the clockwise rotation angle of the rotation angle limit is about 440°. The specific process will not be repeated.
[0022] Based on the understanding of the above working process, refer to Figure 1 First, adjust the initial position before rotation to a position where the boss 11 is close to the second trigger member 9 of the second electrical limit switch 10 and the toggle pin 13 is in contact with the limit step 5 close to the second trigger member 9; then the shaft 3 is pressed Figure 1 In the counterclockwise rotation, when the boss 11 contacts the second trigger member 9, the second electrical limit switch 10 outputs a signal to the controller, and the controller obtains the signal that the angle limit position has been reached, and starts the relevant electrical control function, and the shaft 3 stops rotating, realizing the electrical limit function. If the electrical limit function fails, the boss 11 continues to rotate until it contacts the corresponding side of the limit block 7, and the boss 11 is blocked by the limit block 7 and cannot continue to rotate, realizing the mechanical limit function; the counterclockwise rotation angle of this rotation angle limit is about 5°, which is generally not required in actual application, but it does not rule out the possibility of being required in specific circumstances. This mainly proves that the application range of the utility model is very large. Reference Figure 1 , the initial position before rotation remains unchanged, but the rotation direction of the shaft 3 is clockwise. When the boss 11 contacts the first trigger member 4, the first electrical limit switch 2 outputs a signal to the controller. The controller obtains a signal that the angle limit limit position has been reached, and starts the relevant electrical control function. The shaft 3 stops rotating, and the electrical limit function is realized. If the electrical limit function fails, the boss 11 continues to rotate until it contacts the corresponding side of the limit block 7. The boss 11 is blocked by the limit block 7 and cannot continue to rotate, thereby realizing the mechanical limit function. The clockwise rotation angle of this rotation angle limit is approximately 345°, which is an application scenario less than 360°.
[0023] In summary, in practical applications, the utility model can realize the rotation angle limiting function with an ultra-large limiting angle range of a minimum of close to 0° and a maximum of close to 720° for forward and reverse rotation as needed, and can well meet various application requirements.
[0024] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.
Claims
1. A rotation angle limiting device with a maximum limiting angle greater than 360°, comprising a rotating shaft and a limiting seat, characterized in that: It also includes a cam, which is rotatably connected to one end of the rotating shaft through a connecting shaft, and the circumferential outer wall surface of the cam includes a section of arc-shaped large-diameter arc outer wall surface and a section of arc-shaped small-diameter arc outer wall surface, the center of the large-diameter arc outer wall surface and the center of the small-diameter arc outer wall surface coincide with each other and the connecting shaft passes through the center, the radius of the large-diameter arc outer wall surface is greater than the radius of the small-diameter arc outer wall surface, and the two ends of the large-diameter arc outer wall surface and the two ends of the small-diameter arc outer wall surface respectively correspond to form "L"-shaped limiting steps, and a toggle pin is provided on the rotating shaft and the The toggle pin can be blocked by the two limit steps respectively during the process of forward and reverse rotation with the rotating shaft, the surface of the outer wall of the large-diameter arc is provided with a convex column extending in the circumferential direction, the limit seat is located next to the cam, and a raised limit block is provided on the limit seat. The limit seat is provided with a first electrical limit switch and a second electrical limit switch at positions on opposite sides of the limit block respectively, and the convex column can contact the first trigger member of the first electrical limit switch and the second trigger member of the second electrical limit switch and can contact the opposite sides of the limit block during the process of being pushed and rotated by the toggle pin.
2. The rotation angle limiting device with a maximum limiting angle greater than 360° according to claim 1, characterized in that: The two limiting steps are both located within the range of the corresponding end faces of the rotating shaft, and the connecting shaft passes through the center position of the corresponding end faces of the rotating shaft.
3. The rotation angle limiting device with a maximum limiting angle greater than 360° according to claim 2, characterized in that: The connecting shaft is a connecting screw, and the stud of the connecting screw passes through the central through hole of the pressure plate and the central through hole of the cam in sequence and is connected to the screw hole at the central position of the corresponding end surface of the rotating shaft.
4. The rotation angle limiting device with a maximum limiting angle greater than 360° according to any one of claims 1 to 3, characterized in that: The two opposite side surfaces of the limit block are both planes and are arranged in an "eight" shape with one end close to the cam having a smaller spacing than the other end. The two opposite side surfaces of the protruding column are both planes and are in surface contact with the corresponding side of the limit block.