Limiting rotation structure

Abstract

The utility model discloses a limiting rotating structure, and relates to the technical field of rotating structures, the limiting rotating structure comprises a bottom plate, a rotating part and a rotating frame, the bottom plate is provided with two fixing pieces, and the fixing pieces are oppositely arranged; the two rotating parts are fixed relative to the bottom plate, each rotating part comprises a shaft piece and a rotating shaft, one end of each rotating shaft is connected with a fixing piece, the other end of each rotating shaft is connected with the shaft piece, and a limiting groove is formed in each shaft piece; the rotating frame comprises two rotating arms and a connecting part, the rotating arms are connected to the two ends of the connecting part, the rotating shafts are sleeved with the rotating arms, the rotating arms are provided with limiting pins, and the limiting pins can move in the limiting grooves and are used for limiting the relative rotating range of the rotating arms and the rotating part. The limiting pin slides in the limiting groove, once the limiting pin reaches the tail end of the limiting groove, rotation of the rotating frame is limited and cannot continue to rotate, the connecting part is connected with the rotating arms on the two sides, the rotating part and the bottom plate are clamped between the rotating frame, and therefore axial movement of the rotating structure is avoided under the condition that no load is generated on the limiting pin.

Description

Technical Field

[0001] The present application relates to the technical field of rotation structures, and in particular to a position-limiting rotation structure. Background Art

[0002] A limited rotation mechanism is a mechanical device used to control the range and position of rotation. Through its specific design, it ensures that a rotating body rotates within a specified range, preventing it from exceeding the preset limits. This mechanism has a wide range of applications in various fields, such as machining, automated production lines, robotics, and motion control systems.

[0003] Utility model patent announcement number CN218760887U discloses a limited rotation structure, including a rotating member, a fixed member and a limit member that are separately arranged. The upper and lower ends of the limit member are respectively provided with a first limit block and a second limit block. The rotating member is provided with a first arc-shaped limit groove corresponding to the first limit block, and the fixed member is provided with a second arc-shaped limit groove corresponding to the second limit block. The first limit block and the second limit block are respectively located in the first limit groove and the second limit groove. When the rotating member rotates, the first limit block and the second limit block rotate along the first limit groove and the second limit groove respectively. The utility model provides a small assembly volume by separately arranging the limit member. The rotating member and the fixed member are respectively provided with a first limit groove and a second limit groove. The first limit groove and the second limit groove respectively limit the rotation angle of the first limit block and the second limit block. During the rotation process, the rotating member will not move along the axial direction. However, the axial movement restriction of the limiting rotation structure is achieved by the clamping connection between the limiting groove and the limiting block. Long-term use will cause the limiting block to bear a large load, which is prone to breakage or loosening, and the connection effect will deteriorate. Summary of the Invention

[0004] In order to solve the problem that the limited rotation structure has a poor connection effect due to the long-term clamping restriction of axial movement between the limit block and the limit groove, the present application provides an absorption rotation structure.

[0005] The present application provides a limited rotation structure adopting the following technical solution:

[0006] A limited rotation structure includes:

[0007] The bottom plate is provided with two fixing plates, which are arranged opposite to each other;

[0008] There are two rotating parts, which are fixed relative to the base plate. The rotating parts include a shaft and a rotating shaft. One end of the rotating shaft is connected to the fixed plate, and the other end is connected to the shaft. A limiting groove is provided on the shaft;

[0009] The rotating frame includes two rotating arms and a connecting part. The rotating arms are connected to both ends of the connecting part and are sleeved on the rotating shaft. The rotating arms are provided with a limit pin, which can move in the limit slot to limit the relative rotation range of the rotating arm and the rotating part.

[0010] By adopting the above technical solution, two fixed plates are arranged relative to each other on the base plate, and are connected to a rotating part and a rotating arm. The rotating arms on both sides are connected by a connecting part, and the rotating part and the base plate are clamped between the rotating frame. The outer side is connected to the outer side of the rotating shaft through a shaft plate, thereby avoiding axial movement of the rotating structure, so that the limit pin and the limit groove do not have to assume the function of clamping, reducing the load during rotation. The rotating part is fixed relative to the base plate, so that the rotating arm will rotate relative to the shaft plate. During the rotation process, the limit pin slides in the limit groove. Once it reaches the end of the limit groove, the rotation of the rotating frame will be restricted and it will not be able to continue to rotate. In this way, the rotation range of the rotating frame can be accurately controlled to prevent it from exceeding the preset limit.

[0011] Optionally, a brake is further included, which is sleeved on the rotating shaft and located between the shaft plate and the fixed plate.

[0012] By adopting the above technical solution, the brake can limit the relative rotation between the rotating frame and the base plate, thereby increasing the safety and stability of the rotating structure.

[0013] Optionally, the brake includes a brake body and a brake gear, the brake body is sleeved on the outside of the brake gear, the brake body is fixedly connected to the rotating arm, and the brake gear is fixedly connected to the rotating shaft.

[0014] By adopting the above technical solution, the brake body is connected to the rotating arm, and the brake gear is connected to the rotating shaft, so the brake body will rotate relative to the brake gear. When braking is required, the relative rotation is stopped through the interaction between the two, thereby stopping the relative rotation between the rotating frame and the base plate.

[0015] Optionally, the rotating shaft is provided with a fixing block, the brake gear has a fixing groove, and the fixing block is engaged with the fixing groove to fix the connection between the brake gear and the rotating shaft.

[0016] By adopting the above technical solution, during the braking process, the brake gear needs to bear a larger load. By providing a fixing block and a fixing groove, the degree of fixation between the brake gear and the rotating shaft can be increased, which is conducive to the stable braking process.

[0017] Optionally, the shaft piece is further provided with a positioning groove, and the rotating arm is further provided with a positioning ball and a positioning spring. When the rotating arm rotates to a specified position relative to the shaft piece, the positioning spring pushes the positioning ball into the positioning groove.

[0018] By adopting this technical solution, the positioning slot provides a reference position for the pivoting arm. When the pivoting arm rotates within the positioning slot, the elasticity of the positioning spring pushes the positioning ball into the slot. This changes the rotational resistance, allowing the pivoting position to be determined. When the pivoting arm leaves the slot, the positioning ball overcomes the elastic force of the positioning spring and pushes the positioning ball back into the pivoting arm, allowing the pivoting arm to rotate with normal rotational resistance. The positioning ball, positioning spring, and positioning slot achieve rapid and accurate positioning of the pivoting arm.

[0019] Optionally, a butterfly spring is further included. The butterfly spring is sleeved on the rotating shaft and is arranged between the rotating arm and the brake gear. The butterfly spring is fixed relative to the rotating shaft to generate rotation damping.

[0020] By adopting the above technical solution, the butterfly spring is fixed relative to the rotating shaft and presses against the rotating arm, so that the rotating arm will be subject to resistance generated by the butterfly spring during its rotation process, thereby generating rotational damping, preventing the rotating arm from rotating too fast, and improving the safety and stability of the rotating structure.

[0021] Optionally, a thrust washer is provided between the rotating arm and the butterfly spring.

[0022] By adopting the above technical solution, since the butterfly spring presses against the rotating arm to generate friction, it will cause greater wear on both. By providing a thrust washer, the thrust washer bears the wear caused by friction, thereby reducing the wear of the rotating arm and the thrust washer.

[0023] Optionally, a connecting piece is further included, wherein the middle portion of the connecting piece is fixedly connected to the rotating shaft, and the edge of the connecting piece is connected to the fixing piece.

[0024] By adopting the above technical solution, since the cross-section of the rotating shaft is smaller and the connection points are fewer, a tighter and multi-point connection is provided by the connecting piece, thereby improving the fixation degree of the rotating part and the base plate.

[0025] Optionally, a friction sleeve is provided between the rotating arm and the rotating shaft.

[0026] By adopting the above technical solution, the rotating arm needs to rotate relative to the rotating shaft, so friction will cause wear on both. By providing a friction sleeve, the rotational wear between the two is reduced, thereby improving the durability of the rotating structure.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. During rotation, the limit pin slides in the limit slot. Once it reaches the end of the limit slot, the rotation of the rotating frame will be restricted and cannot continue to rotate. The connecting part connects the rotating arms on both sides, clamping the rotating part and the base plate between the rotating frame, and is connected to the outer side of the rotating shaft through the shaft plate on the outside, thereby preventing axial movement of the rotating structure without applying load to the limit pin.

[0029] 2. The brake body is connected to the rotating arm, and the brake gear is connected to the rotating shaft. Therefore, the brake body will rotate relative to the brake gear. When braking is required, the interaction between the two stops the relative rotation, thereby stopping the relative rotation between the rotating frame and the base plate.

[0030] 3. The butterfly spring presses against the thrust washer, and the friction generated when the two rotate relative to each other forms resistance, thereby generating rotational damping, preventing the rotating arm from rotating too fast, and improving the safety and stability of the rotating structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0032] Figure 2 It is a schematic diagram of the explosion structure of an embodiment of the present application;

[0033] Figure 3 Schematic diagram of the exploded structure of the rotating part and the rotating frame of the embodiment of the present application;

[0034] Figure 4 yes Figure 2 A partial enlarged schematic diagram of part A;

[0035] Figure 5 yes Figure 3 A partial enlarged schematic diagram of part B;

[0036] Figure 6 yes Figure 3 A partial enlarged schematic diagram of part C in the middle;

[0037] Figure 7 It is a schematic diagram of the cross-sectional structure of the rotating part of the embodiment of the present application.

[0038] Figure numerals: 1, base plate; 11, fixed plate; 2, rotating part; 21, shaft plate; 21a, limit groove; 21b, positioning groove; 22, rotating shaft; 22a, fixed block; 3, rotating frame; 31, rotating arm; 31a, limit pin; 31b, positioning ball; 31c, positioning spring; 31d, thrust washer; 31e, friction sleeve; 32, connecting part; 4, brake; 41, brake body; 41a, connecting rod; 42, brake gear; 42a, fixing groove; 5, butterfly spring; 6, connecting plate. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1 To the attached Figure 7 , further details of this application are given.

[0040] A limited rotation structure, referring to Figure 1 and Figure 2 , comprising a base plate 1, a rotating part 2, a rotating frame 3, a brake 4, and a connecting piece 6. The base plate 1 is a rectangular structure, with a fixed piece 11 at each end. The outer ring of the fixed piece 11 is connected to the connecting piece 6. The middle of the connecting piece 6 is connected to the rotating shaft 22 of the rotating part 2. The middle of the connecting piece 6 is fixed to the rotating shaft 22 by two screws and has a groove that matches the rotating shaft 22, so that the rotating part 2 can be fixed relative to the connecting piece 6 and the base plate 1.

[0041] Reference Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The rotating portion 2 includes a shaft 21 and a rotating shaft 22. The shaft 21 is arranged parallel to the fixed plate 11. The rotating shaft 22 connects the connecting plate 6 and the shaft 21. The rotating frame 3, the brake 4, and the butterfly spring 5 are respectively mounted on the rotating shaft 22. The rotating frame 3 includes two rotating arms 31 and a connecting portion 32 connecting the two rotating arms 31. The rotating arms 31 are mounted at the position closest to the shaft 21, allowing the rotating frame 3 to rotate relative to the rotating shaft 22. A friction sleeve 31e is provided between the rotating arms 31 and the rotating shaft 22 to reduce friction between the two. The rotating arms 31 are equipped with a limit pin 31a, a positioning ball 31b, and a positioning spring 31c. The side of the shaft 21 near the rotating arm 31 is equipped with a limit slot 21a and a positioning slot 21b. The limiting pin 31a is movable within the limiting groove 21a, which is an arc-shaped groove. The limiting pin 31a can only move within the range of the limiting groove 21a, thereby limiting the rotation range of the rotating frame 3 relative to the base plate 1. The positioning ball 31b and the positioning spring 31c are disposed within the groove of the rotating arm 31. In the absence of external force, the positioning ball 31b can be ejected into the groove by the positioning spring 31c. There are two positioning grooves 21b. When the rotating arm 31 rotates to a specified position relative to the shaft 21, the position of the positioning ball 31b corresponds to the position of the positioning groove 21b. Under the action of the positioning spring 31c, the positioning ball 31b enters the positioning groove 21b, thereby forming a large resistance, indicating that the rotating arm 31 has rotated to the specified position, thereby achieving rapid positioning.

[0042] Refer to the figure Figure 3 、 Figure 4 、 Figure 5 and Figure 6The brake 4 is sleeved onto the rotating shaft 22 and includes a brake body 41 and a brake gear 42. The brake body 41 is located outside the brake gear 42 and is provided with a connecting rod 41a, which is fixedly connected to the rotating arm 31 via the connecting rod 41a. The brake gear 42 is provided with a fixing groove 42a, and the rotating shaft 22 is provided with a fixing block 22a. The fixing block 22a engages with the fixing groove 42a, thereby fixing the brake gear 42 to the rotating shaft 22. The brake gear 42 can rotate relative to the brake gear 42 fixedly connected to the rotating shaft 22 along with the rotating arm 31. When braking is required, the brake body 41 clamps the brake gear 42, thereby driving the relative braking of the rotating arm 31 and the rotating shaft 22.

[0043] Reference Figure 5 、 Figure 6 and Figure 7 The limited rotation structure also includes a butterfly spring 5, which is sleeved on the rotating shaft 22 and fixed relative to the rotating shaft 22. A thrust washer 31d is provided at the position where the rotating arm 31 contacts the butterfly spring 5. A friction plate is provided on one side of the butterfly spring 5, and the friction plate rests on the thrust washer 31d, so that the rotating arm 31 is subjected to friction when rotating, thereby generating rotation damping, thereby improving the safety and stability of the rotating structure.

[0044] The implementation principle of the embodiment of the present application is as follows: During the installation of the rotating structure, the components on both sides of the base plate 1 are first installed in sequence, and then the rotating arms 31 on both sides are connected via the connecting portion 32, thereby simplifying the installation process. During the rotation process, the limit pin 31a is restricted in the limit slot 21a, thereby limiting the rotation range of the rotating frame 3 relative to the base plate 1. When the positioning ball 31b and the positioning spring 31c rotate to the positioning slot 21b, the positioning ball 31b can be rebounded into the positioning slot 21b, forming a rotational resistance, allowing the rotating structure to be quickly positioned. The butterfly spring 5 can generate rotational damping by rubbing against the thrust washer 31d, preventing the rotating structure from rotating too quickly. The friction between the butterfly spring 5 and the thrust washer 31d can be adjusted by adjusting the compression of the butterfly spring 5, thereby adjusting the magnitude of the rotational damping.

[0045] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A limited rotation structure, characterized in that: include: The bottom plate (1) is provided with two fixing plates (11), the fixing plates being arranged opposite to each other; There are two rotating parts (2) fixed relative to the base plate (1), and the rotating parts (2) include a shaft (21) and a rotating shaft (22), one end of the rotating shaft (22) is connected to the fixed plate (11), and the other end is connected to the shaft (21), and a limiting groove (21a) is provided on the shaft (21); The rotating frame (3) comprises two rotating arms (31) and a connecting portion (32), wherein the rotating arms (31) are connected to both ends of the connecting portion (32), the rotating arms (31) are sleeved on the rotating shaft (22), and the rotating arms (31) are provided with a limiting pin (31a), wherein the limiting pin (31a) is movable in the limiting groove (21a) and is used to limit the relative rotation range of the rotating arms (31) and the rotating portion (2).

2. A rotation limiting structure according to claim 1, characterized in that: It also includes a brake (4), which is sleeved on the rotating shaft (22) and located between the shaft plate (21) and the fixing plate (11).

3. The rotation limiting structure according to claim 2, characterized in that: The brake (4) comprises a brake body (41) and a brake gear (42), wherein the brake body (41) is sleeved on the outside of the brake gear (42), the brake body (41) is fixedly connected to the rotating arm (31), and the brake gear (42) is fixedly connected to the rotating shaft (22).

4. The rotation limiting structure according to claim 3, characterized in that: The rotating shaft (22) is provided with a fixing block (22a), the brake gear (42) has a fixing groove (42a), and the fixing block (22a) and the fixing groove (42a) are engaged with each other to fixedly connect the brake gear (42) and the rotating shaft (22).

5. The rotation limiting structure according to claim 1, characterized in that: The shaft (21) is further provided with a positioning groove (21b), and the rotating arm (31) is further provided with a positioning ball (31b) and a positioning spring (31c). When the rotating arm (31) rotates to a specified position relative to the shaft (21), the positioning spring (31c) pushes the positioning ball (31b) into the positioning groove (21b).

6. The rotation limiting structure according to claim 3, characterized in that: It also includes a butterfly spring (5), which is sleeved on the rotating shaft (22) and arranged between the rotating arm (31) and the brake gear (42). The butterfly spring (5) is fixed relative to the rotating shaft (22) and is used to generate rotation damping.

7. The rotation limiting structure according to claim 6, characterized in that: A thrust washer (31d) is provided between the rotating arm (31) and the butterfly spring (5).

8. The rotation limiting structure according to claim 1, characterized in that: It also includes a connecting piece (6), the middle portion of the connecting piece (6) is fixedly connected to the rotating shaft (22), and the edge of the connecting piece (6) is connected to the fixing piece (11).

9. The rotation limiting structure according to claim 1, characterized in that: A friction sleeve (31e) is provided between the rotating arm (31) and the rotating shaft (22).

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