A super 360° bidirectional rotation limit device and a test fixture having the same

Abstract

The present invention provides a super 360° bidirectional rotation limit device, comprising a first limit block, a second limit block, a third limit block and a fourth limit block, wherein the third limit block and the fourth limit block are fixedly arranged on a top plate, and characterized in that the first limit block and the second limit block are both provided with a rotating end and a synchronous end, the synchronous ends of the first limit block and the second limit block are both provided with a first limit surface and a first friction surface, the third limit block and the fourth limit block are both provided with a second limit surface and a second friction surface, and the first limit surface and the second limit surface can limit the relative movement between the first limit block and the third limit block and between the second limit block and the fourth limit block when in contact, and the second friction surface can drive the first friction surface to rotate when in contact with the first friction surface.

Description

Technical Field

[0001] The present invention relates to the technical field of limit devices, and in particular to a super 360-degree bidirectional rotation limit device and a test fixture having the same. Background Art

[0002] In the existing mechanical and electronic fields, when the rotation range of a rotating mechanism needs to be controlled, it is usually achieved by a combination of electromechanical or pure mechanical structure.

[0003] At present, for the rotation limit devices on the market, most of them use electronic component limit switches for inductive limit. However, this kind of limit inductive switch is easy to misjudge the positive and negative directions of the rotating shaft during normal operation, and has poor reliability, causing the cable in the shaft hole of the rotating shaft to be damaged due to strong twisting, resulting in serious equipment failure. In addition, when the machine equipment is powered off, the limit inductive switch fails, and the rotating structure rotates arbitrarily, causing the cable in the rotating shaft hole to twist, deform and be damaged. At the same time, even if you want to use a purely mechanical structure as a rotation limit structure, the traditional mechanical hard limit structure cannot meet the requirements of more than 360-degree coaxial bidirectional rotation. Therefore, the existing rotation limit device relies too much on electricity and gas, and cannot cope with the working conditions when the machine equipment fails or the power is off, and cannot meet the requirements of more than 360-degree coaxial bidirectional rotation of the rotation limit device. Summary of the invention

[0004] In order to solve the problem that the existing rotation limit device cannot meet the requirements of the working environment when the machine equipment fails or the power is off, the present invention provides a super 360° bidirectional rotation limit device and a test fixture having the same.

[0005] A super 360° bidirectional rotation limit device comprises a first limit block, a second limit block, a third limit block and a fourth limit block, wherein the third limit block and the fourth limit block are fixedly arranged on a top plate, and characterized in that the first limit block and the second limit block are both provided with a rotating end and a synchronization end, the synchronization ends of the first limit block and the second limit block are both provided with a first limit surface and a first friction surface, the third limit block and the fourth limit block are both provided with a second limit surface and a second friction surface, the first limit surface and the second limit surface can limit the relative movement between the first limit block and the third limit block and between the second limit block and the fourth limit block when in contact, and the second friction surface can drive the first friction surface to rotate when in contact with the first friction surface.

[0006] Furthermore, the first limiting surface is a plane and the second limiting surface is a plane, and when the first limiting surface contacts the second limiting surface, the first limiting surface and the second limiting surface overlap.

[0007] Furthermore, the first friction surface is an arc surface, the second friction surface is a plane, and when the first friction surface is in contact with the second friction surface, the tangent surface of the first friction surface overlaps with that of the second friction surface.

[0008] In another preferred embodiment of the present invention, the rotating ends of the first limiting block and the second limiting block are connected via a rotating shaft, and the synchronizing ends of the first limiting block and the second limiting block are connected via a synchronizing pin.

[0009] Furthermore, it also includes a base, and the first limit block and the second limit block are rotatably arranged on the base through the rotating shaft.

[0010] Furthermore, the base is provided with a first buffer pad, which is arranged on the upper surface of the base corresponding to the first limiting block and is used to buffer the rigid contact between the first limiting block and the base.

[0011] Furthermore, the base is further provided with a second buffer pad, which is arranged on the upper surface of the base corresponding to the second limiting block and is used to buffer the rigid contact between the second limiting block and the base.

[0012] Furthermore, the distance between the second limiting surfaces of the third limiting block and the fourth limiting block is greater than the distance between the axis of the rotating shaft and the axis of the synchronization pin.

[0013] Based on the same idea, the present invention also provides a test fixture, which adopts the above-mentioned super 360° bidirectional rotation limit device.

[0014] Furthermore, the number of the super-360° bidirectional rotation limit devices is 3, which are respectively used to achieve the bidirectional rotation limit effect of the test fixture in the three directions of X, Y, and Z axes in the spatial coordinate system.

[0015] The super 360° bidirectional rotation limit device of the present invention comprises a first limit block, a second limit block, a third limit block and a fourth limit block. The rotating ends of the first limit block and the second limit block are provided with a first limit surface and a first friction surface, the third limit block and the fourth limit block are provided with a second limit surface and a second friction surface, and the top plate is externally connected to a rotating device. Taking the contact between the second limit block and the fourth limit block as an example, when the rotating device rotates close to 360°, the first limit block and the third limit block are in contact; the second friction surface of the third limit block uses its own slope to drive the third limit block to rotate around the rotation axis. Since the second limit block and the first limit block are connected by a synchronization pin, the second limit block is linked with the first limit block and rotates at the same time; when the rotating device rotates close to 360°, the third limit block drives the synchronization end of the first limit block to rotate downward, and the synchronization end of the second limit block rotates upward; when the rotating device rotates more than 360°, the fourth limit block acts as a hard limit structure to block the continued rotation of the second limit block, thereby achieving a rotation limit of more than 360°. Similarly, when the first limit block and the third limit block contact to play a limiting role, the rotating device rotates in the opposite direction, and also achieves a rotation limit effect of more than 360°, thereby achieving a two-way rotation limit effect. Therefore, by setting the four limit blocks, namely the first limit block, the second limit block, the third limit block and the fourth limit block, it can be ensured that the rotating device can achieve the effect of rotational limiting within a 360° rotation angle range in two opposite directions without relying on the assistance of any electrical components. It can cope with the working conditions when the machine equipment fails or power is off, and meet the requirements of the rotational limit device for coaxial bidirectional rotation of more than 360 degrees, and effectively protect the cable in the shaft hole of the rotating shaft from being damaged by strong twisting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the first state of the super 360° bidirectional rotation limiting device of the present invention;

[0017] Figure 2 It is a schematic diagram of the second state of the super 360° bidirectional rotation limiting device of the present invention;

[0018] Figure 3 It is a schematic diagram of the third state of the super 360° bidirectional rotation limiting device of the present invention;

[0019] Figure 4 3 is a schematic diagram of a fourth state of the super 360° bidirectional rotation limiting device of the present invention;

[0020] Figure 5 3 is a schematic diagram of the fifth state of the super 360° bidirectional rotation limiting device of the present invention;

[0021] Figure 6 Schematic diagram of the second limiting surface and the second friction surface of the super 360° bidirectional rotation limiting device of the present invention;

[0022] Figure 7 is a schematic diagram of the overall structure of the test fixture of the present invention;

[0023] Explanation of the accompanying drawings: 1. first limit block; 101. first limit surface; 102. first friction surface; 2. second limit block; 3. third limit block; 201. second limit surface; 202. second friction surface; 4. fourth limit block; 5. top plate; 6. base; 7. rotating shaft; 8. synchronization pin; 9. first buffer pad; 10. second buffer pad; 11. super 360° bidirectional rotation limit device. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 and Figure 6 As shown, according to an embodiment of the present invention, the super 360° bidirectional rotation limit device includes a third limit block 3 and a fourth limit block 4 arranged on the top plate 5, the third limit block 3 and the fourth limit block 4 are both provided with a second limit surface 201 and a second friction surface 202, the second limit surface 201 and the second friction surface 202 are both planes, the second limit surface 201 is perpendicular to the horizontal plane, and the second friction surface 202 is inclined at a certain angle to the horizontal plane.

[0026] The first limit block 1 and the second limit block 2 are both provided with a synchronization end (not shown in the figure), and the synchronization end is provided with a first limit surface 101 and a first friction surface 102. The first limit surface 101 is a plane and perpendicular to the horizontal plane, and the second limit surface 102 is an arc surface.

[0027] When the first limiting surface 101 and the second limiting surface 201 are in contact, the first limiting surface 101 and the second limiting surface 201 overlap, thereby limiting the relative movement between the first limiting block 1 and the third limiting block 3 and the relative movement between the second limiting block 2 and the fourth limiting block 4.

[0028] When the first friction surface 102 and the second friction surface 202 are in contact, the cross-section of the first friction surface 102 overlaps with the second friction surface 202, ensuring that the first friction surface 102 and the second friction surface 202 can rotate smoothly relative to each other when in contact with each other, thereby ensuring that the second friction surface 202 can drive the first friction surface 102 to rotate through the friction force between them when in contact with the first friction surface 102.

[0029] See also Figure 2 As shown, according to an embodiment of the present invention, the first limit block 1 and the second limit block 2 are both provided with a rotating end (not shown in the figure) and a synchronous end, the rotating end is connected by a rotating shaft 7, and the two ends of the rotating shaft 7 are rotatably connected to the base 6, thereby the first limit block 1 and the second limit block 2 are rotatably arranged on the base 6. The synchronous ends are connected by a synchronous pin 7, and when the first limit block 1 rotates, due to the linkage effect of the synchronous pin 7, the second limit block 2 can be driven to rotate synchronously.

[0030] The distance between the second limit surfaces 201 of the third limit block 3 and the fourth limit block 4 is greater than the distance between the axis of the rotating shaft 7 and the synchronization pin 8, thereby ensuring that the first limit block 1 and the second limit block 2 are restricted by the third limit block 3 and the fourth limit block 4 from continuing to rotate when the bidirectional rotation exceeds 360°.

[0031] The base 6 is provided with a first buffer pad 9, which is a rubber pad. The first buffer pad 9 is arranged on the upper surface of the base 6 corresponding to the first limit block 1. When the first limit block 1 rotates to contact the base 6, the first buffer pad 9 is located between the first limit block 1 and the base 6, and is used to buffer the rigid contact between the first limit block 1 and the base 6.

[0032] See also Figure 5 As shown, according to an embodiment of the present invention, the base is provided with a second buffer pad 10, the second buffer pad 10 is a rubber pad, and the second buffer pad 10 is arranged on the upper surface position of the base 6 corresponding to the second limit block 2. When the second limit block 2 rotates to contact with the base 6, the second buffer pad 10 is located between the second limit block 2 and the base 6, and is used to buffer the rigid contact between the second limit block 2 and the base 6.

[0033] In the first operation embodiment, taking the second limit block 2 and the fourth limit block 4 as an example for limiting the position:

[0034] See also Figure 1 As shown, the top plate 5 is externally connected to a rotating device (not shown in the figure). When the rotating device rotates nearly 360°, the starting point of the arc surface of the first limit block 2 and the plane of the third limit block 3 just touch each other.

[0035] See also Figure 2 As shown, since the first friction surface 102 of the first limit block 1 is an arc surface, and the second friction surface 202 of the third limit block 3 is a plane, the section of the arc surface coincides with the plane, ensuring that the first limit block 1 and the third limit block 3 can rotate smoothly relative to each other. At the same time, due to the existence of friction between the two, the third limit block 3 can drive the rotation of the first limit block 1 while moving.

[0036] See also Figure 3As shown, due to the linkage of the synchronization pin 8, the first limit block 1 can simultaneously drive the synchronous rotation of the second limit block 2 while rotating. Therefore, when the rotating device rotates close to 360°, the third limit block 3 drives the synchronization end of the first limit block 1 to rotate downward, and the synchronization end of the linked second limit block 2 will rotate upward (erect).

[0037] See also Figure 4 As shown, when the rotation angle of the rotating device exceeds 360°, the fourth limit block 4 will act as a hard limit structure to block the second limit block 2 from continuing to rotate. At the same time, due to the action of the synchronization pin 8, the first limit block 1 also stops rotating.

[0038] The same principle, in another operating embodiment, see Figure 5 As shown, when the first limit block 1 and the third limit block 3 are used for limiting, the rotating device rotates in the opposite direction to the first embodiment, and the first friction surface 102 of the second limit block 2 and the second friction surface 202 of the fourth limit block 4 rotate relative to each other. When the first limit surface 101 of the first limit block 1 and the second limit surface 201 of the third limit block 3 contact and overlap, the second limit block 2 and the fourth limit block 4 stop rotating relative to each other.

[0039] The above two embodiments are combined to realize the function of limiting the rotation of the rotating device beyond 360° in two opposite directions.

[0040] See also Figure 7 As shown, according to another preferred embodiment of the present invention, a super 360° bidirectional rotation limit device 11 is applied to a test fixture, and the number is 3, which are respectively arranged on the top, side and bottom of the test fixture, so as to achieve the bidirectional rotation limit effect of the test fixture in the X, Y and Z axis directions of the spatial coordinate system.

[0041] The super-360° bidirectional rotation limit device of the present invention is different from the traditional rotation limit device. The traditional rotation limit device mostly uses an electronic component limit switch for sensing the limit. This limit sensing switch is prone to misjudging the positive and negative directions of the rotating shaft during normal operation and has poor reliability, causing the cable in the shaft hole of the rotating shaft to be damaged due to strong twisting, resulting in serious equipment failure. In addition, when the machine equipment is powered off, the limit sensing switch fails, the rotating structure rotates arbitrarily, and the cable in the rotating shaft hole is twisted, deformed and damaged.

[0042] The super 360° bidirectional rotation limit device of the present invention comprises a first limit block 1, a second limit block 2, a third limit block 3 and a fourth limit block 4. The rotating ends of the first limit block 1 and the second limit block 2 are provided with a first limit surface 101 and a first friction surface 102, the third limit block 3 and the fourth limit block 4 are provided with a second limit surface 201 and a second friction surface 202, and the top plate 5 is externally connected to a rotation device. Taking the contact between the second limit block 2 and the fourth limit block 4 as an example, when the rotating device rotates close to 360°, the first limit block 1 and the third limit block 3 are in contact; the second friction surface 202 of the third limit block 3 uses its own slope to drive the third limit block 3 to rotate around the rotation axis 7. Since the second limit block 2 and the first limit block 1 are connected by the synchronization pin 8, the second limit block 2 is linked with the first limit block 1 and rotates at the same time; when the rotating device rotates close to 360°, the third limit block 3 drives the synchronization end of the first limit block 1 to rotate downward, and the synchronization end of the second limit block 2 to rotate upward; when the rotating device rotates more than 360°, the fourth limit block 4 acts as a hard limit structure to block the continued rotation of the second limit block 2, thereby achieving a rotation limit of more than 360°. Similarly, when the first limit block 1 and the third limit block 3 are in contact to play a limiting role, the rotating device rotates in the opposite direction, and also achieves a rotation limit effect of more than 360°, thereby achieving a two-way rotation limit effect. Therefore, by setting the four limit blocks of the first limit block 1, the second limit block 2, the third limit block 3 and the fourth limit block 4, it can be ensured that the rotating device can achieve the effect of rotational limiting within a 360° rotation angle range in two opposite directions without relying on the assistance of any electrical components. It can cope with the working conditions when the machine equipment fails or the power is off, and meet the requirements of the rotational limit device for coaxial bidirectional rotation of more than 360 degrees, and effectively protect the cable in the shaft hole of the rotating shaft 7 from being damaged by strong twisting.

[0043] Of course, the above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the basic principles of the present invention, and these improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A super 360° bidirectional rotation limit device, comprising a first limit block, a second limit block, a third limit block and a fourth limit block, wherein the third limit block and the fourth limit block are fixedly arranged on a top plate, characterized in that: The first limit block and the second limit block are both provided with a rotating end and a synchronization end, the synchronization ends of the first limit block and the second limit block are both provided with a first limit surface and a first friction surface, the third limit block and the fourth limit block are both provided with a second limit surface and a second friction surface, the first limit surface and the second limit surface can limit the relative movement between the first limit block and the third limit block and between the second limit block and the fourth limit block when in contact, and the second friction surface can drive the first friction surface to rotate when in contact with the first friction surface.

2. The super 360° bidirectional rotation limiting device according to claim 1, characterized in that: The first limiting surface and the second limiting surface are both planes, and when the first limiting surface and the second limiting surface are in contact, the first limiting surface and the second limiting surface overlap.

3. The super 360° bidirectional rotation limiting device according to claim 2, characterized in that: The first friction surface is an arc surface, the second friction surface is a plane, and when the first friction surface is in contact with the second friction surface, a tangent surface of the first friction surface overlaps with the second friction surface.

4. The super 360° bidirectional rotation limiting device according to claim 1, characterized in that: The rotating ends of the first limiting block and the second limiting block are connected via a rotating shaft, and the synchronous ends of the first limiting block and the second limiting block are connected via a synchronous pin.

5. The super 360° bidirectional rotation limiting device according to claim 4, characterized in that: It also includes a base, and the first limiting block and the second limiting block are rotatably arranged on the base through the rotating shaft.

6. The super 360° bidirectional rotation limiting device according to claim 5, characterized in that: The base is provided with a first buffer pad, which is arranged on the upper surface of the base corresponding to the first limiting block and is used to buffer the rigid contact between the first limiting block and the base.

7. The super 360° bidirectional rotation limiting device according to claim 6, characterized in that: The base is further provided with a second buffer pad, which is arranged on the upper surface of the base corresponding to the second limiting block and is used to buffer the rigid contact between the second limiting block and the base.

8. The super 360° bidirectional rotation limiting device according to claim 4, characterized in that: The distance between the third limiting block and the second limiting surface of the fourth limiting block is greater than the distance between the rotation axis and the axis center of the synchronization pin.

9. A test fixture, characterized in that: The super 360° bidirectional rotation limiting device as described in any one of claims 1 to 8 is adopted.

10. The test fixture according to claim 9, characterized in that: The number of the super 360° bidirectional rotation limiting devices is 3, which are respectively used to achieve the bidirectional rotation limiting effect of the test fixture in the three directions of X, Y and Z axes in the spatial coordinate system.

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