Distraction device

Abstract

The utility model discloses an expanding device which comprises a base, a connecting rod assembly and a plurality of supporting pieces. Each supporting piece comprises a linkage part and a profiling part which are connected, and the linkage part is rotationally connected to the base. The connecting rod assembly comprises a moving rod and a plurality of extension rods, the moving rod movably penetrates through the base in the first direction, each extension rod is rotationally connected with the moving rod and the linkage part, the extension rods are arranged on the periphery of the moving rod at intervals, and each extension rod can drive one supporting piece to rotate when the moving rod moves in the first direction; and the multiple profiling parts move back to or towards the moving rod at the same time, so that the annular materials arranged on the peripheries of the multiple profiling parts in a sleeving mode are expanded or loosened. The expanding device is applied to the flexible ring, namely, the annular material is the flexible ring, the flexible ring can be expanded when the profiling parts are expanded, and the multiple profiling parts move at the same time, so that the flexible ring can be stressed evenly and is not prone to being damaged.

Description

Technical Field

[0001] This application belongs to the field of assembly tool technology, and in particular relates to a spreading device. Background Technology

[0002] During product assembly, a flexible ring needs to be fitted onto the workpiece. The size of the workpiece and the size of the flexible ring must be compatible. Usually, workers pull on the edges of the flexible ring to deform it and fit it onto the workpiece. However, this method of having workers pull the flexible ring to open it is not highly automated and is inefficient. Utility Model Content

[0003] In view of the above situation, it is necessary to provide a spreading device to improve the technical problem of low automation caused by workers pulling on ring-shaped materials.

[0004] Embodiments of this application provide a spreading device, including a base, a linkage assembly, and multiple support members. Each support member includes a linkage part and a contouring part connected together, with the linkage part rotatably connected to the base. The linkage assembly includes a movable rod and multiple extension rods. The movable rod is movably inserted through the base along a first direction, and each extension rod is rotatably connected to the movable rod and the linkage part. The multiple extension rods are spaced apart on the outer periphery of the movable rod. Each extension rod can drive a support member to rotate when the movable rod moves along the first direction, causing multiple contouring parts to move simultaneously away from or towards the movable rod, thereby spreading or loosening the annular material sleeved on the outer periphery of the multiple contouring parts.

[0005] In the aforementioned spreading device, the moving rod moves relative to the base, causing multiple extension rods to move and rotate relative to the moving rod. Each extension rod drives a connected support member to rotate relative to the base, thereby causing multiple contouring parts to move simultaneously towards or away from the moving rod. When multiple contouring parts move away from the moving rod simultaneously, they unfold to spread the annular material, resulting in uniform force distribution and an increase in size. When multiple contouring parts move towards the moving rod simultaneously, they converge to loosen the annular material, allowing it to detach from the spreading device. When applied to flexible rings (where the annular material is flexible), the unfolding of the contouring parts spreads the flexible ring, and the simultaneous movement of multiple contouring parts ensures uniform force distribution on the flexible ring, reducing its susceptibility to damage.

[0006] In some embodiments, the extension direction of the linkage part and the extension direction of the contouring part form an angle α, where 90° < α < 180°.

[0007] In some embodiments, the movable rod has a stop surface, and the linkage assembly further includes an elastic element that is sleeved on the movable rod and abuts against the stop surface and the base, respectively.

[0008] In some embodiments, the inner periphery of the plurality of contouring portions is used to accommodate the workpiece, and the end of the moving rod away from the base is used to position the workpiece so as to position the workpiece within the inner periphery of the plurality of contouring portions.

[0009] In some embodiments, the outer periphery of the contouring part is provided with a protruding ridge, which is located at one end of the contouring part facing the linkage part and is used to stop the annular material when multiple contouring parts move away from the moving rod at the same time.

[0010] In some embodiments, the spreading device further includes a sleeve connected to the base and fitted around the outer periphery of the support member to protect the support member.

[0011] In some embodiments, the base is provided with a plurality of first connecting parts, each first connecting part being rotatably connected to a linkage part away from the end of the part being modeled via a first rotating shaft; the outer periphery of the moving rod is provided with a plurality of second connecting parts, each second connecting part being rotatably connected to an extension rod via a second rotating shaft, the extension rod being rotatably connected to a linkage part near the end of the part being modeled via a third rotating shaft, the first rotating shaft and the third rotating shaft connecting the same linkage part being parallel, and the second rotating shaft and the third rotating shaft connecting the same extension rod being parallel.

[0012] In some embodiments, the extension rod includes two crossbars with a gap between them. The gap is used to accommodate the end of the second connecting part away from the moving rod and the end of the linkage part near the contouring part. The second pivot and the third pivot pass through the two crossbars and connect the second connecting part and the linkage part in the gap.

[0013] In some embodiments, the contouring part is an arc-shaped sheet, and the centers of multiple contouring parts coincide. When viewed along the first direction, the centers of the multiple contouring parts coincide with the moving rod.

[0014] In some embodiments, the base is provided with a guide, which is connected to a movable rod and is used to guide the movable rod to move in a first direction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of the spreading device in one embodiment of this application.

[0016] Figure 2 yes Figure 1 A schematic diagram of the structure of the middle support component.

[0017] Figure 3 yes Figure 1 A schematic diagram of a medium elastic element in its uncompressed state.

[0018] Figure 4 yes Figure 3 A schematic diagram of a medium elastic element under compression.

[0019] Figure 5 yes Figure 1A schematic diagram of the middle connecting rod assembly.

[0020] Figure 6 This is an exploded view of the workpiece and the annular material in one embodiment of this application.

[0021] Explanation of main component symbols

[0022] 100. Spreading device; 10. Base; 11. First connecting part; 111. First rotating shaft; 12. Guide; 121. Bearing seat; 122. Linear bearing; 20. Support; 21. Linkage part; 22. Contouring part; 221. Protruding ridge; 30. Linkage assembly; 31. Moving rod; 311. Protruding ring; 3111. Stop surface; 312. Mounting cylinder; 313. Second connecting part; 314. Positioning block; 32. Extension rod; 321. Crossbar; 3201. Gap; 3211. Second rotating shaft; 3212. Third rotating shaft; 33. Elastic element; 40. Sleeve; 50. Cylinder; 200. Annular material; 300. Workpiece; α. Included angle; Z. First direction.

[0023] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In the description of the embodiments of this application, the term "perpendicular" is used to describe the ideal state between two components. In actual production or use, two components may be in a state that is approximately perpendicular. The term "parallel" is used to describe the ideal state between two components. In actual production or use, two components may be in a state that is approximately parallel.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0029] During product assembly, a flexible ring needs to be fitted onto the workpiece. The size of the workpiece and the size of the flexible ring must be compatible. Usually, workers pull on the edges of the flexible ring to deform it and fit it onto the workpiece. However, this method of having workers pull the flexible ring to open it is not highly automated and is inefficient.

[0030] Embodiments of this application provide a spreading device, including a base, a linkage assembly, and multiple support members. Each support member includes a linkage part and a contouring part connected together, with the linkage part rotatably connected to the base. The linkage assembly includes a movable rod and multiple extension rods. The movable rod is movably inserted through the base along a first direction, and each extension rod is rotatably connected to the movable rod and the linkage part. The multiple extension rods are spaced apart on the outer periphery of the movable rod. Each extension rod can drive a support member to rotate when the movable rod moves along the first direction, causing multiple contouring parts to move simultaneously away from or towards the movable rod, thereby spreading or loosening the annular material sleeved on the outer periphery of the multiple contouring parts.

[0031] In the aforementioned spreading device, the moving rod moves relative to the base, causing multiple extension rods to move and rotate relative to the moving rod. Each extension rod drives a connected support member to rotate relative to the base, thereby causing multiple contouring parts to move simultaneously towards or away from the moving rod. When multiple contouring parts move away from the moving rod simultaneously, they unfold to spread the annular material, resulting in uniform force distribution and an increase in size. When multiple contouring parts move towards the moving rod simultaneously, they converge to loosen the annular material, allowing it to detach from the spreading device. When applied to flexible rings (where the annular material is flexible), the unfolding of the contouring parts spreads the flexible ring, and the simultaneous movement of multiple contouring parts ensures uniform force distribution on the flexible ring, reducing its susceptibility to damage.

[0032] The embodiments of this application will be further described below with reference to the accompanying drawings. Unless otherwise specified, the various embodiments in this application can be combined with each other.

[0033] Please see Figure 1 The first direction is defined as the direction parallel to Z in the diagram. For ease of reference, the first direction will be referred to as "first direction Z" in the following text.

[0034] Please see Figure 1This application provides a spreading device 100, including a base 10, a connecting rod assembly 30, and multiple support members 20. The base 10 is fixedly installed. The connecting rod assembly 30 is used to connect the multiple support members 20 so as to drive the multiple support members 20 to move simultaneously.

[0035] Each support member 20 includes a linkage part 21 and a contouring part 22. The linkage part 21 is fixedly connected to the contouring part 22. The end of the linkage part 21 away from the contouring part 22 is rotatably connected to the base 10. The linkage assembly 30 includes a moving rod 31 and a plurality of extension rods 32. The moving rod 31 is movably inserted through the base 10. Each extension rod 32 is rotatably connected to the moving rod 31 and the end of the linkage part 21 near the contouring part 22. When the moving rod 31 moves relative to the base 10, the extension rod 32 moves with the moving rod 31 and rotates relative to the moving rod 31. The extension rod 32 drives the connected linkage part 21 to rotate, causing the contouring part 22 to move closer to or away from the moving rod 31 as the linkage part 21 rotates.

[0036] Multiple extension rods 32 are spaced apart on the outer periphery of the movable rod 31, so that multiple support members 20 are spaced apart on the outer periphery of the movable rod 31. When the movable rod 31 moves relative to the base 10, each extension rod 32 drives the connected linkage part 21 to rotate, so that multiple contouring parts 22 move simultaneously away from or towards the movable rod 31.

[0037] 200 cyclic materials (refer to) Figure 6 The annular material 200 can be fitted onto the outer periphery of multiple contouring parts 22. When the multiple contouring parts 22 move simultaneously away from the moving rod 31, the multiple contouring parts 22 unfold to expand the annular material 200, and the annular material 200 is evenly stressed and its size increases. When the multiple contouring parts 22 move simultaneously toward the moving rod 31, the multiple contouring parts 22 converge to loosen the annular material 200, and the annular material 200 fitted onto the outer periphery of the multiple contouring parts 22 can be removed.

[0038] In some embodiments, the movable rod 31 is slidably disposed on the base 10 along the first direction Z. The movable rod 31 can move relative to the base 10 along the first direction Z, so as to drive the extension rod 32 to move along the first direction Z with the movable rod 31 and rotate relative to the movable rod 31.

[0039] In some embodiments, the inner periphery of the plurality of contoured portions 22 is used to accommodate the workpiece 300 (see figure). Figure 6 When multiple contouring parts 22 move simultaneously away from the moving rod 31, that is, when multiple contouring parts 22 unfold, the inner circumference of multiple contouring parts 22 can accommodate the workpiece 300, so as to fit the annular material 200 onto the workpiece 300.

[0040] In some embodiments, the end of the moving rod 31 away from the base 10 is used to position the workpiece 300, so as to position the workpiece 300 on the inner periphery of the plurality of contouring parts 22 and position the installation position of the workpiece 300 on the inner periphery of the plurality of contouring parts 22, so that the workpiece 300 can be partially exposed in the contouring parts 22.

[0041] In some embodiments, a positioning block 314 is fixedly connected to one end of the moving rod 31 away from the base 10. The positioning block 314 can be inserted into the positioning groove of the workpiece 300, so that the workpiece 300 can be sleeved on the positioning block 314 to position the relative position between the workpiece 300 and the moving rod 31, so as to stably install the workpiece 300 on the inner periphery of the plurality of contour parts 22.

[0042] In use, the annular material 200 is fitted onto the outer periphery of multiple contouring parts 22, and the moving rod 31 is driven to move, causing the multiple contouring parts 22 to unfold and expand the annular material 200; the workpiece 300 is placed on the inner periphery of the multiple contouring parts 22 and connected to the positioning block 314, so that the annular material 200 is partially fitted onto the workpiece 300 and partially fitted onto the outer periphery of the contouring parts 22; the moving rod 31 is driven to move, causing the multiple contouring parts 22 to converge and loosen the annular material 200; the workpiece 300 is removed from the inner periphery of the contouring parts 22, and the workpiece 300 moves the annular material 200 relative to the multiple contouring parts 22 in the first direction Z toward the base 10, until the annular material 200 slides out from the outer periphery of the multiple contouring parts 22 and is completely fitted onto the outer periphery of the workpiece 300, thus completing the assembly of the annular material 200 and the workpiece 300.

[0043] In some embodiments, the workpieces 300 within the inner periphery of the plurality of contouring parts 22 can be manually removed by personnel, or the workpieces 300 within the inner periphery of the plurality of contouring parts 22 can be gripped by a robotic arm. This application does not limit the scope of the invention, and those skilled in the art can choose the appropriate method based on the specific circumstances.

[0044] In some embodiments, the outer periphery of the contouring portion 22 is smoothly disposed. The frictional force between the workpiece 300 and the annular material 200 is greater than the frictional force between the contouring portion 22 and the annular material 200, so that the workpiece 300 can drive the annular material 200 to slide relative to the outer periphery of the contouring portion 22, so as to remove the annular material 200 from the outer periphery of the contouring portion 22.

[0045] Please see Figure 6 In some embodiments, the annular material 200 is a flexible ring. The spreading device 100 is applied to the flexible ring, meaning the annular material 200 is a flexible ring. When the multiple contouring parts 22 unfold, they can spread the flexible ring. The simultaneous movement of the multiple contouring parts 22 ensures that the flexible ring is subjected to uniform force and is less prone to damage. The workpiece 300 is a semi-finished product that can be used to install the flexible ring.

[0046] In some embodiments, the flexible ring includes a rubber ring or other deformable materials, which are not limited herein, and those skilled in the art can choose according to the actual situation.

[0047] Please see Figure 1 In use, the first direction Z is vertical. The spreading device 100 is installed vertically to facilitate the placement or removal of the workpiece 300, and also to facilitate the placement or removal of the annular material 200, thus simplifying user operation and use. For ease of description, the end of the contouring part 22 connected to the linkage part 21 is defined as the bottom end of the contouring part 22, and the end of the contouring part 22 away from the linkage part 21 is positioned as the top end of the contouring part 22. The workpiece 300 is inserted downwards from the top ends of the multiple contouring parts 22 into the inner periphery of the multiple contouring parts 22 and inserted into the positioning block 314.

[0048] In some embodiments, when the annular material 200 is circular, a plurality of extension rods 32 are evenly and spaced on the outer periphery of the moving rod 31, so that a plurality of support members 20 are also evenly and spaced on the outer periphery of the connecting rod assembly 30. The contouring portion 22 is arc-shaped, so that the outer periphery of the contouring portion 22 can be adapted to the shape of the annular material 200. The centers of the plurality of contouring portions 22 coincide. When viewed along the first direction Z, the centers of the plurality of contouring portions 22 coincide with the moving rod 31, so that when the plurality of contouring portions 22 move simultaneously away from the moving rod 31, the annular material 200 can be subjected to uniform force, and the plurality of contouring portions 22 simultaneously apply the same tension to the inner periphery of the annular material 200, which is less likely to cause damage to the annular material 200 due to uneven force.

[0049] In some embodiments, the number of extension rods 32 is six, and the number of support members 20 is also six, with one extension rod 32 used to rotatably connect to one support member 20. Depending on the size of the annular material 200 and the size of the contoured part 22, other numbers of extension rods 32 may be provided, which are not limited herein, and those skilled in the art can choose according to the actual situation.

[0050] In some embodiments, when the annular material 200 is polygonal, such as a rhomboid or rectangular annular shape, the contouring portion 22 is flat, allowing its outer periphery to conform to the inner edge of the polygonal annular material 200. Depending on the shape of the annular material 200, different numbers of contouring portions 22 can be provided, ensuring that each side of the annular material 200 is supported by at least one contouring portion 22, resulting in more uniform force distribution on the annular material 200. Depending on the shape of the annular material 200, extension rods 32 of different lengths can be provided, so that when multiple contouring portions 22 move the same distance, they apply the same tension to each side of the annular material 200, further ensuring more uniform force distribution on the annular material 200.

[0051] Please see Figure 2 and Figure 3In some embodiments, the extension direction of the linkage 21 forms an angle α with the extension direction of the contouring part 22. When the linkage 21 rotates relative to the base 10, it drives the contouring part 22 to rotate together, thereby causing the multiple contouring parts 22 to unfold or converge. 90° < α < 180°, which makes the top of the contouring part 22 move more than the bottom when the linkage part 21 rotates. That is, when multiple contouring parts 22 are unfolded, the top of the contouring part 22 is farther away from the moving rod 31, and the top of multiple contouring parts 22 has a larger opening, so that the workpiece 300 can be inserted into the inner circumference of multiple contouring parts 22 from the top of multiple contouring parts 22, which facilitates the installation of workpiece 300. When multiple contouring parts 22 are gathered together, the top of the contouring part 22 is closer to the moving rod 31, and the top of multiple contouring parts 22 is gathered into a smaller size, so that the workpiece 300 can drive the annular material 200 to slide upward, and the annular material 200 slides down from the top of multiple contouring parts 22.

[0052] When the dimensions of the contouring part 22 and the linkage part 21 are constant, the larger the included angle α, the smaller the range of motion of the top end of the contouring part 22 relative to the bottom end of the contouring part 22; and the smaller the included angle α, the larger the range of motion of the top end of the contouring part 22 relative to the bottom end of the contouring part 22.

[0053] In the embodiments of this application, the included angle α is 160°. The contouring part 22 can move with the linkage part 21, and the range of motion is appropriate. Depending on the size and type of the workpiece 300 and the annular material 200, the included angle α can also be other angles. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0054] Please see Figure 3 and Figure 4 In some embodiments, the base 10 is fixedly provided with a plurality of first connecting parts 11. Each first connecting part 11 is rotatably connected to the end of a linkage part 21 away from the contouring part 22 via a first rotating shaft 111. A plurality of second connecting parts 313 are fixedly provided on the outer periphery of the moving rod 31. Each second connecting part 313 is rotatably connected to an extension rod 32 via a second rotating shaft 3211, and the extension rod 32 is rotatably connected to the end of a linkage part 21 near the contouring part 22 via a third rotating shaft 3212. The first rotating shaft 111 and the third rotating shaft 3212 connecting the same linkage part 21 are parallel, and the second rotating shaft 3211 and the third rotating shaft 3212 connecting the same extension rod 32 are parallel.

[0055] Understandably, the extension direction of the first rotating shaft 111 is perpendicular to the extension direction of the connected first connecting part 11. The extension direction of the second rotating shaft 3211 is perpendicular to the extension direction of the connected second connecting part 313. The extension directions of both the second rotating shaft 3211 and the third rotating shaft 3212 are perpendicular to the extension direction of the connected extension rod 32.

[0056] Please combine Figure 3 and Figure 4 For ease of description, the end of the linkage 21 furthest from the contouring part 22 is defined as the bottom end of the linkage 21, and the end of the linkage closest to the contouring part 22 is positioned as the top end of the connecting part. In a support member 20, when the moving rod 31 moves along the first direction Z toward the base 10, the moving rod 31 drives the second connecting part 313 to move toward the first connecting part 11. Please refer to [link to relevant documentation]. Figure 4 The second connecting part 313 pulls the top end of the linkage part 21 through the extension rod 32, causing the bottom end of the linkage part 21 to rotate relative to the first connecting part 11 around the first rotating shaft 111, thereby driving the contouring part 22 to rotate with the linkage part 21 around the first rotating shaft 111, so that the contouring part 22 moves toward the moving rod 31.

[0057] In some embodiments, a mounting sleeve 312 is fixedly sleeved on the outer periphery of the movable rod 31. A second connecting portion 313 is fixedly connected to the mounting sleeve 312. The mounting sleeve 312 can connect multiple second connecting portions 313 so that multiple contoured portions 22 can move simultaneously toward the movable rod 31. The number of first connecting portions 11 and second connecting portions 313 are the same and they correspond one-to-one, so as to drive multiple support members 20 to move simultaneously.

[0058] Please see Figure 5 In some embodiments, the extension rod 32 includes two crossbars 321. A gap 3201 is provided between the two crossbars 321. The gap 3201 is used to accommodate the end of the second connecting portion 313 away from the moving rod 31 and the end of the linkage portion 21 near the contour portion 22. A second rotating shaft 3211 and a third rotating shaft 3212 are fixedly inserted through the two crossbars 321 and rotatably connect the second connecting portion 313 and the linkage portion 21 within the gap 3201, thereby allowing the extension rod 32 to rotate relative to the top ends of the second connecting portion 313 and the linkage portion 21 via the second rotating shaft 3211 and the third rotating shaft 3212.

[0059] In some embodiments, the first connecting part 11 is also rotatably connected to the bottom end of the linkage part 21 through the same structure, which will not be described in detail here.

[0060] Please see Figure 3 and Figure 4 In some embodiments, the spreading device 100 further includes a sleeve 40. The sleeve 40 is fixedly connected to the base 10 and is fitted around the outer periphery of the support member 20 to protect the support member 20.

[0061] In some embodiments, the sleeve 40 is a hollow cylindrical structure, thereby adapting to a plurality of arc-shaped conforming portions 22. Depending on the shape of the conforming portions 22, the sleeve 40 may also be configured as a cylindrical structure of other shapes. This application does not limit the scope of the application, and those skilled in the art can make the selection according to the actual situation.

[0062] Please see Figures 1 to 4 In some embodiments, the outer periphery of the contouring portion 22 is provided with a protruding ridge 221. The protruding ridge 221 is provided at the end of the contouring portion 22 facing the linkage portion 21 and is used to stop the annular material 200 when multiple contouring portions 22 move away from the moving rod 31 at the same time. When multiple contouring portions 22 are unfolded, the protruding ridge 221 stops the annular material 200 from sliding downward to prevent the annular material 200 from detaching from the contouring portion 22.

[0063] In some embodiments, when the multiple contouring parts 22 are unfolded, the protrusion 221 can also be used to abut against the inner wall of the sleeve 40 to prevent the contouring part 22 from moving excessively against the moving rod 31, so that the outer periphery of the contouring part 22 always has a gap with the inner wall of the sleeve 40, so as to leave enough space to accommodate the annular material 200 and avoid the contouring part 22 from moving excessively against the moving rod 31 and squeezing the annular material 200.

[0064] Please see Figure 3 and Figure 4 In some embodiments, the movable rod 31 is provided with a stop surface 3111, and the connecting rod assembly 30 further includes an elastic element 33, which is sleeved on the movable rod 31 and abuts against the stop surface 3111 and the base 10 respectively.

[0065] When the moving rod 31 moves towards the base 10 along the first direction Z, the elastic element 33 is elastically compressed, causing the extension rod 32 to move relatively smoothly towards the base 10 along with the moving rod 31, thereby reducing the vibration of the moving rod 31 and the extension rod 32 and ensuring the stability of the rotation of the support member 20. When the moving rod 31 moves away from the base 10 along the first direction Z, the elastic element 33 rebounds, thus preparing for the next elastic compression.

[0066] In some embodiments, the elastic element 33 is a spring. The movable rod 31 is a round rod. Adapting the shape of the elastic element 33 to the shape of the movable rod 31 facilitates the fitting of the elastic element 33 onto the round rod.

[0067] In some embodiments, the movable rod 31 is provided with a protruding ring 311. The end of the mounting cylinder 312 facing the base 10 abuts against the protruding ring 311, thereby cooperating with the positioning block 314 to limit the sliding of the mounting cylinder 312 relative to the movable rod 31. The side of the protruding ring 311 facing the base 10 is a stop surface 3111, thereby allowing the elastic member 33 to abut between the stop surface 3111 and the base 10.

[0068] Please see Figure 1 In some embodiments, the base 10 is provided with a guide 12. The guide 12 is connected to the moving rod 31 and is used to guide the moving rod 31 to move along a first direction Z.

[0069] Please see Figure 3 and Figure 4In some embodiments, the guide 12 includes a bearing housing 121 and a linear bearing 122. The bearing housing 121 is fixedly mounted on the base 10, and the linear bearing 122 is mounted on the bearing housing 121. The first connecting portion 11 is fixedly connected to the outer periphery of the bearing housing 121. The moving rod 31 passes through the linear bearing 122, so that the linear bearing 122 can guide the moving rod 31 along the first direction Z, so that the moving rod 31 can move smoothly along the first direction Z and prevent the moving rod 31 from shaking during movement.

[0070] Please see Figure 1 In some embodiments, the power source for driving the moving rod 31 to move along the first direction Z is a cylinder 50. The cylinder 50 is located below the base 10, and the telescopic end of the cylinder 50 passes through the base 10 and is fixedly connected to the moving rod 31.

[0071] In some embodiments, the power source that drives the moving rod 31 to move along the first direction Z can also be other structures such as a lead screw assembly that can drive the moving rod 31 to reciprocate. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0072] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A spreading device, characterized in that, include: Base; Multiple support members, each of which includes a connecting link and a contouring part, the connecting part being rotatably connected to the base; The linkage assembly includes a movable rod and multiple extension rods. The movable rod is movably inserted through the base along a first direction. Each extension rod is rotatably connected to the movable rod and the linkage part. The multiple extension rods are spaced apart on the outer periphery of the movable rod. Each extension rod can drive a support member to rotate when the movable rod moves along the first direction, so that the multiple contoured parts move simultaneously away from or towards the movable rod to open or loosen the annular material sleeved on the outer periphery of the multiple contoured parts.

2. The spreading device as described in claim 1, characterized in that, The extension direction of the linkage part and the extension direction of the contouring part form an angle α, where 90° < α < 180°.

3. The spreading device as described in claim 1, characterized in that, The movable rod is provided with a stop surface, and the connecting rod assembly also includes an elastic element, which is sleeved on the movable rod and abuts against the stop surface and the base respectively.

4. The spreading device according to any one of claims 1 to 3, characterized in that, The inner periphery of the plurality of contouring portions is used to accommodate the workpiece, and the end of the moving rod away from the base is used to position the workpiece so as to position the workpiece within the inner periphery of the plurality of contouring portions.

5. The spreading device as described in claim 4, characterized in that, The outer periphery of the contouring part is provided with a protruding ridge, which is located at one end of the contouring part facing the linkage part and is used to stop the annular material when multiple contouring parts move away from the moving rod at the same time.

6. The spreading device as described in claim 5, characterized in that, The spreading device also includes a sleeve, which is connected to the base and sleeved around the outer periphery of the support member to protect the support member.

7. The spreading device as described in claim 1, characterized in that, The base is provided with a plurality of first connecting parts, and each first connecting part is rotatably connected to one end of the linkage part away from the part being imitated via a first rotating shaft; The outer periphery of the movable rod is provided with a plurality of second connecting parts. Each second connecting part is rotatably connected to an extension rod via a second rotating shaft. The extension rod is rotatably connected to one end of a linkage part near the contouring part via a third rotating shaft. The first rotating shaft and the third rotating shaft connected to the same linkage part are parallel to each other. The second rotating shaft and the third rotating shaft connected to the same extension rod are parallel to each other.

8. The spreading device as described in claim 7, characterized in that, The extension rod includes two crossbars with a gap between them. The gap is used to accommodate the end of the second connecting part away from the moving rod and the end of the linkage part near the contouring part. The second pivot and the third pivot pass through the two crossbars and connect the second connecting part and the linkage part in the gap.

9. The spreading device as described in claim 1, characterized in that, The contouring part is an arc-shaped piece, and the centers of multiple contouring parts coincide. When viewed along the first direction, the centers of multiple contouring parts coincide with the moving rod.

10. The spreading device as claimed in claim 1, characterized in that, The base is provided with a guide, which is connected to the moving rod and is used to guide the moving rod to move along the first direction.

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