A stirrer blade stamping apparatus

CN122875615APending Publication Date: 2026-10-09CHANGZHOU SANMA MASCH MFG CO LTD
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Patent Information

Application Number
CN202611382690.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-09-08
Publication Date
2026-10-09

AI Technical Summary

Benefits of technology

[0019]本发明通过设备冲压作业过程中,固定块和上模下行冲压时,固定块、连接块以及楔形条同步向下运动,楔形条抵靠支撑卡条,促使卡条发生转动并从卡槽内部脱离移出,冲压工序完成后,上模连同固定块向上复位,弹性件二释放弹力推动顶升板与顶升柱向上位移,顶升柱便可将嵌装在下模型腔内的成型搅拌器叶片向上顶出,工件脱离模具型腔后便于操作人员快速取件,减少卸料耗时,有效提升叶片冲压加工的卸料作业效率;

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Abstract

The present application relates to the technical field of stirrer blade stamping, in particular to a kind of stirrer blade stamping equipment, it mainly includes base, base top surface is fixedly installed with fixed plate and four fixed columns, fixed plate top surface is installed with lower die, further comprising: buffer mechanism, buffer mechanism is set in base top, jacking mechanism, jacking mechanism is set in base top. Through equipment stamping operation process, fixed block and upper die down stroke stamping, fixed block, connecting block and wedge strip synchronous downward movement, wedge strip abuts against support clamping strip, make clamping strip rotate and from the inside of clamping groove separate removal, after stamping procedure is completed, upper die together with fixed block is reset upwards, elastic piece two release elastic force and push jacking plate and jacking column upwards displacement, jacking column can be embedded in the forming stirrer blade of lower die cavity and eject upwards, workpiece is separated from mould cavity after mold cavity, it is convenient for operator to take piece quickly, reduce unloading time consumption, effectively improve the unloading operation efficiency of blade stamping processing.
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Description

Technical Field

[0001] This invention relates to the field of agitator blade stamping technology, specifically to agitator blade stamping equipment. Background Technology

[0002] The agitator blades are the core working components of the agitator. They rotate with the shaft to agitate the medium, driving the materials to mix, shear, and disperse. They are mostly made of metal and come in various structural forms to adapt to different working conditions, achieving uniform material mixing and reaction. Agitator blades are typically formed using a stamping process. Stamping uses sheet metal as raw material, relying on molds to complete the blanking and stamping process. The equipment is equipped with a stamping slide, positioning fixtures, and specialized forming molds, enabling rapid stamping of steel plates to directly obtain agitator blades. The processing accuracy is stable, and the forming consistency is good. It replaces traditional cutting and welding processes, shortens processing steps, improves production efficiency, reduces labor costs, and is suitable for mass production of blade components for various mixing devices.

[0003] When stamping agitator blades using stamping equipment, the operator places the metal sheet on the lower mold for positioning. The cylinder drives the upper mold to move downward to complete the stamping of the sheet. After stamping, the formed agitator blade is embedded in the lower mold cavity. The formed blade needs to be manually removed from the lower mold. The blade is locked in the mold cavity. The manual material removal operation is laborious, complex and time-consuming, which reduces the workpiece unloading speed and directly affects the overall unloading efficiency of the blade, thus restricting the processing efficiency of continuous stamping production of agitator blades. Summary of the Invention

[0004] The purpose of this invention is to provide a stirrer blade stamping device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A mixer blade stamping device includes: a base, a fixing plate and four fixing columns fixedly mounted on the top surface of the base, a lower die mounted on the top surface of the fixing plate, a fixing block and an upper die disposed above the base, and further includes:

[0007] A buffer mechanism is provided above the base. The buffer mechanism includes a fixed sleeve that is fixedly installed on the side of the upper mold, and a cylinder that is fixedly installed on the side of the fixed block.

[0008] The lifting mechanism is located above the base and includes a lifting plate inside the fixed plate. Two lifting columns are fixedly installed on the top surface of the lifting plate, and a connecting plate is fixedly installed on the side of the lifting plate.

[0009] Preferably, a mounting plate is fixedly installed on the upper end of the fixed column, a stamping cylinder is fixedly installed on the top surface of the mounting plate, a lifting plate is slidably installed on the outer wall of the fixed column, the lower end of the output rod of the stamping cylinder slides through the mounting plate and is fixedly connected to the top surface of the lifting plate, and a controller is fixedly installed on the side of the base.

[0010] Preferably, multiple fixed sleeves and cylinders are provided. A connecting column is fixedly installed on the inner wall of the fixed sleeve, and a cavity is provided inside the cylinder. The upper end of the connecting column slides through the bottom surface of the cylinder and extends into the cavity.

[0011] Preferably, a movable block is slidably installed on the inner wall of the cavity, the upper end of the connecting column is fixedly connected to the bottom surface of the movable block, and an elastic element is movably installed on the outer wall of the connecting column, with the two ends of the elastic element abutting against the top surface of the fixed sleeve and the bottom surface of the cylinder, respectively.

[0012] Preferably, a stop plate is fixedly installed on the bottom surface of the fixing block, and a circular plate is fixedly installed on the top surface of the upper mold.

[0013] Preferably, multiple limiting blocks are fixedly installed on the top surface of the lower mold, and limiting posts are fixedly installed on the top surface of the limiting blocks. Multiple limiting holes are provided through the upper mold, and the outer wall of the limiting post is slidably connected to the inner wall of the limiting hole.

[0014] Preferably, the fixed plate has a cavity and a groove inside. The side of the lifting plate is slidably connected to the inner wall of the cavity, and the side of the connecting plate is slidably connected to the inner wall of the groove. The inner wall of the cavity has two mounting grooves. An elastic element is fixedly installed on the inner wall of the mounting groove. The upper end of the elastic element abuts against the bottom surface of the lifting plate.

[0015] Preferably, the lower mold has two through holes, the outer wall of the lifting column is slidably connected to the inner wall of the through holes, and the top surface of the lifting column is flush with the inner wall of the lower mold.

[0016] Preferably, a hinge block and a concave frame are fixedly installed on the side of the fixed plate, a locking strip is hinged to the inner wall of the hinge block, a slot is provided on the side of the connecting plate, the locking strip engages with the slot, the side of the locking strip is slidably connected to the inner wall of the concave frame, a connecting block is fixedly installed on the side of the fixed block, a wedge strip is fixedly installed on the bottom surface of the connecting block, and the side of the wedge strip is slidably connected to the side of the locking strip.

[0017] Preferably, the concave frame has two connecting cavities inside. A movable plate is slidably installed on the inner wall of the connecting cavity. An installation groove 2 is provided on the inner wall of the connecting cavity. An elastic element 3 is fixedly installed on the inner wall of the installation groove 2. The other end of the elastic element 3 is fixedly connected to the movable plate. A hemisphere is fixedly installed on the side of the two movable plates that are close to each other. The hemisphere slides through the inner wall of the connecting cavity and extends to the outer side of the concave frame. The outer wall of the hemisphere is slidably connected to the side of the card strip.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] During the stamping process, the fixed block, connecting block, and wedge strip move downwards synchronously when the fixed block and upper die are stamping downwards. The wedge strip abuts against the support strip, causing the support strip to rotate and disengage from the slot. After the stamping process is completed, the upper die and the fixed block are reset upwards. The elastic element releases its elastic force to push the lifting plate and lifting column upwards. The lifting column can then push the formed agitator blade embedded in the lower mold cavity upwards. After the workpiece is removed from the mold cavity, it is easy for the operator to quickly remove the part, reducing the unloading time and effectively improving the unloading efficiency of the blade stamping process.

[0020] The lifting plate and the fixed block are driven to move downward by the stamping cylinder, which simultaneously drives the cylinder, connecting column, fixed sleeve and upper die to move downward. When the upper die gradually approaches and contacts the lower die to carry out the stamping operation, the upper die will drive the fixed sleeve to compress the elastic element one. The elastic element one is deformed under pressure, which plays a buffering and shock absorption role for the fixed sleeve and the upper die. Subsequently, the abutting plate and the circular plate abut against each other, further driving the upper die to complete the stamping and forming. Under the buffering and unloading effect of the elastic element one, the stamping impact load can be weakened, the probability of the upper die being damaged by rigid impact can be reduced, and the overall service life of the equipment can be extended. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the upper mold of the present invention;

[0023] Figure 3 This is an exploded view of the three-dimensional structure of the upper mold of the present invention;

[0024] Figure 4 This is a schematic cross-sectional view of the cylindrical three-dimensional structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of the lower mold of the present invention;

[0026] Figure 6 This is an exploded view of the three-dimensional structure of the lower mold of the present invention;

[0027] Figure 7 This is a schematic cross-sectional view of the three-dimensional structure of the fixing plate of the present invention;

[0028] Figure 8 This is a cross-sectional schematic diagram of the concave frame three-dimensional structure of the present invention.

[0029] In the picture:

[0030] 1. Base; 101. Fixing plate; 102. Lower mold; 103. Fixing column; 104. Mounting plate; 105. Stamping cylinder; 106. Lifting plate; 107. Fixing block; 108. Upper mold; 109. Controller;

[0031] 2. Buffer mechanism; 201. Fixed sleeve; 202. Connecting column; 203. Cylindrical column; 204. Cavity; 205. Moving block; 206. Elastic element one; 207. Limiting hole; 208. Limiting block; 209. Limiting column; 210. Circular plate; 211. Abutting plate;

[0032] 3. Lifting mechanism; 301. Cavity; 302. Groove; 303. Lifting plate; 304. Lifting column; 305. Through hole; 306. Elastic element two; 307. Mounting groove one; 308. Connecting plate; 309. Slot; 310. Hinge block; 311. Locking strip; 312. Concave frame; 313. Connecting cavity; 314. Mounting groove two; 315. Moving plate; 316. Hemisphere; 317. Elastic element three; 318. Connecting block; 319. Wedge strip. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application.

[0035] like Figures 1-8 As shown, this application provides a stirrer blade stamping device, including: a base 1, a fixing plate 101 and four fixing columns 103 fixedly installed on the top surface of the base 1, a lower mold 102 installed on the top surface of the fixing plate 101, and a fixing block 107 and an upper mold 108 arranged above the base 1.

[0036] Specifically, such as Figure 1 As shown, a mounting plate 104 is fixedly installed on the upper end of the fixed column 103, a stamping cylinder 105 is fixedly installed on the top surface of the mounting plate 104, a lifting plate 106 is slidably installed on the outer wall of the fixed column 103, the lower end of the output rod of the stamping cylinder 105 slides through the mounting plate 104 and is fixedly connected to the top surface of the lifting plate 106, and a controller 109 is fixedly installed on the side of the base 1.

[0037] In this embodiment: the fixed column 103 limits the movement of the lifting plate 106, making the movement of the lifting plate 106 more stable; the stamping cylinder 105 drives the lifting plate 106 to rise and fall.

[0038] The buffer mechanism 2 is located above the base 1. The buffer mechanism 2 includes a fixed sleeve 201 fixedly installed on the side of the upper mold 108, and a cylinder 203 fixedly installed on the side of the fixed block 107.

[0039] Specifically, such as Figures 2-4 As shown, multiple fixed sleeves 201 and cylinders 203 are provided. A connecting column 202 is fixedly installed on the inner wall of the fixed sleeve 201. A cavity 204 is provided inside the cylinder 203. The upper end of the connecting column 202 slides through the bottom surface of the cylinder 203 and extends into the cavity 204.

[0040] In this embodiment, the connecting column 202 is limited by the cylindrical column 203, which makes the movement of the connecting column 202 and the fixed sleeve 201 more stable, and further improves the stability of the movement of the upper mold 108.

[0041] Specifically, such as Figure 4 As shown, a movable block 205 is slidably installed on the inner wall of the cavity 204, the upper end of the connecting column 202 is fixedly connected to the bottom surface of the movable block 205, and an elastic element 206 is movably installed on the outer wall of the connecting column 202. The two ends of the elastic element 206 abut against the top surface of the fixed sleeve 201 and the bottom surface of the cylinder 203, respectively.

[0042] In this embodiment: the cavity 204 makes the movement of the moving block 205 more stable, further ensuring the movement of the connecting column 202 and the fixed sleeve 201 is more stable, and driving the upper mold 108 to move more stably. The elastic element 206 buffers the fixed sleeve 201 and the upper mold 108, making the upper mold 108 less prone to damage.

[0043] Specifically, such as Figure 3 As shown, a stop plate 211 is fixedly installed on the bottom surface of the fixing block 107, and a circular plate 210 is fixedly installed on the top surface of the upper mold 108.

[0044] In this embodiment: when the upper die 108 is stamping, the elastic element 206 buffers the upper die 108. When the upper die 108 moves upward, it causes the circular plate 210 to come into contact with the abutment plate 211. The abutment plate 211 supports the circular plate 210, so that the upper die 108 can perform stamping.

[0045] Specifically, such as Figures 4-5 As shown, multiple limiting blocks 208 are fixedly installed on the top surface of the lower mold 102, and limiting posts 209 are fixedly installed on the top surface of the limiting blocks 208. Multiple limiting holes 207 are provided through the upper mold 108, and the outer wall of the limiting post 209 is slidably connected to the inner wall of the limiting hole 207.

[0046] In this embodiment: the metal plate is limited by the limiting block 208, and the limiting post 209 and the limiting hole 207 are provided. The limiting post 209 and the limiting hole 207 cooperate to limit the upper die 108, so that the upper die 108 is more stable during stamping, less prone to deviation, and improves the accuracy of stamping.

[0047] The lifting mechanism 3 is located above the base 1. The lifting mechanism 3 includes a lifting plate 303 located inside the fixed plate 101. Two lifting columns 304 are fixedly installed on the top surface of the lifting plate 303, and a connecting plate 308 is fixedly installed on the side of the lifting plate 303.

[0048] Specifically, such as Figure 7 As shown, the fixed plate 101 has a cavity 301 and a groove 302 inside. The side of the lifting plate 303 is slidably connected to the inner wall of the cavity 301, and the side of the connecting plate 308 is slidably connected to the inner wall of the groove 302. The inner wall of the cavity 301 is provided with two mounting grooves 307. An elastic element 306 is fixedly installed on the inner wall of the mounting groove 307. The upper end of the elastic element 306 abuts against the bottom surface of the lifting plate 303.

[0049] In this embodiment: the second elastic element 306 is limited and connected through the first mounting groove 307, and the second elastic element 306 applies elastic force to the lifting plate 303.

[0050] Specifically, such as Figures 5-6 As shown, the lower mold 102 has two through holes 305. The outer wall of the lifting column 304 is slidably connected to the inner wall of the through hole 305, and the top surface of the lifting column 304 is flush with the inner wall of the lower mold 102.

[0051] In this embodiment: the lifting column 304 is flush with the inner wall of the lower mold 102. When it abuts against the inner wall of the lower end of the cavity 301 at the bottom of the lifting plate 303, the top surface of the lifting column 304 is flush with the inner wall of the lower mold 102, ensuring that the blade is stamped more evenly.

[0052] Specifically, such as Figures 4-7 As shown, a hinge block 310 and a concave frame 312 are fixedly installed on the side of the fixed plate 101. A retaining strip 311 is hinged to the inner wall of the hinge block 310. A retaining groove 309 is provided on the side of the connecting plate 308. The retaining strip 311 is engaged with the retaining groove 309. The side of the retaining strip 311 is slidably connected to the inner wall of the concave frame 312. A connecting block 318 is fixedly installed on the side of the fixed block 107. A wedge strip 319 is fixedly installed on the bottom surface of the connecting block 318. The side of the wedge strip 319 is slidably connected to the side of the retaining strip 311.

[0053] In this embodiment: the locking strip 311 engages with the slot 309, at which time the locking strip 311 fixes the connecting plate 308 and the lifting plate 303. When the fixing block 107 drives the upper die 108 to move downward for stamping, the wedge strip 319 moves downward and pushes the locking strip 311 to rotate. The locking strip 311 moves out from the inner wall of the slot 309, releasing the lock on the connecting plate 308.

[0054] Specifically, such as Figure 8 As shown, the concave frame 312 has two connecting cavities 313 inside. A movable plate 315 is slidably installed on the inner wall of the connecting cavity 313. A second mounting groove 314 is provided on the inner wall of the connecting cavity 313. An elastic element 317 is fixedly installed on the inner wall of the second mounting groove 314. The other end of the elastic element 317 is fixedly connected to the movable plate 315. A hemisphere 316 is fixedly installed on the side of the two movable plates 315 that are close to each other. The hemisphere 316 slides through the inner wall of the connecting cavity 313 and extends to the outside of the concave frame 312. The outer wall of the hemisphere 316 is slidably connected to the side of the retaining strip 311.

[0055] In this embodiment: the hemisphere 316 limits the locking strip 311, so that the locking strip 311 is stably limited in the concave frame 312, and the elastic element 317 applies elastic force to the moving plate 315 and the hemisphere 316.

[0056] The specific steps are as follows: Manually press the connecting plate 308 and the lifting plate 303 downwards, pushing the locking strip 311 to rotate a certain angle. The locking strip 311 engages with the locking groove 309, fixing the connecting plate 308 and the lifting plate 303. The locking strip 311 is connected to the concave frame 312, and the hemisphere 316 blocks and limits the locking strip 311. The metal plate is placed on the lower mold 102, and the limiting block 208 limits the metal plate. The stamping cylinder 105 is activated, driving the lifting mechanism. Plate 106 and fixing block 107 move downwards, simultaneously driving cylinder 203, connecting column 202, fixing sleeve 201, and upper die 108 downwards. When upper die 108 gradually approaches and contacts lower die 102 to perform stamping operations, upper die 108 will drive fixing sleeve 201 to compress elastic element 206. Elastic element 206 deforms under pressure, providing buffering and shock absorption for fixing sleeve 201 and upper die 108. Subsequently, abutting plate 211 and circular plate 210 abut against each other, further driving... The upper die 108 completes the stamping process. Under the buffering and unloading effect of the elastic element 206, the stamping impact load can be weakened, reducing the probability of the upper die 108 being damaged by rigid impact and extending the overall service life of the equipment. Meanwhile, the fixed block 107, connecting block 318, and wedge strip 319 move downwards synchronously. The wedge strip 319 abuts against the support clip 311, causing the clip 311 to rotate and squeeze the hemisphere 316. The hemisphere 316 drives the moving plate 315 to squeeze the elastic element 317. The clip 311 rotates and disengages from the slot 309. After the stamping process is completed, the upper die 108, together with the fixed block 107, returns to its original position. The elastic element 306 releases its elastic force to push the lifting plate 303 and the lifting column 304 upwards. The lifting column 304 can then push the forming agitator blade embedded in the cavity of the lower die 102 upwards. After the workpiece leaves the mold cavity, it is easy for the operator to quickly remove the part, reducing the unloading time and effectively improving the unloading efficiency of the blade stamping process.

[0057] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0058] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A stirrer blade stamping device, comprising: A base (1), on the top surface of which a fixing plate (101) and four fixing columns (103) are fixedly installed, and a lower mold (102) is installed on the top surface of the fixing plate (101), and a fixing block (107) and an upper mold (108) are provided above the base (1), characterized in that it further includes: The buffer mechanism (2) is located above the base (1). The buffer mechanism (2) includes a fixed sleeve (201) fixedly installed on the side of the upper mold (108), and a cylinder (203) fixedly installed on the side of the fixed block (107). The lifting mechanism (3) is located above the base (1). The lifting mechanism (3) includes a lifting plate (303) located inside the fixed plate (101). Two lifting columns (304) are fixedly installed on the top surface of the lifting plate (303), and a connecting plate (308) is fixedly installed on the side of the lifting plate (303).

2. The agitator blade stamping device according to claim 1, characterized in that, An mounting plate (104) is fixedly installed on the upper end of the fixed column (103). A stamping cylinder (105) is fixedly installed on the top surface of the mounting plate (104). A lifting plate (106) is slidably installed on the outer wall of the fixed column (103). The lower end of the output rod of the stamping cylinder (105) slides through the mounting plate (104) and is fixedly connected to the top surface of the lifting plate (106). A controller (109) is fixedly installed on the side of the base (1).

3. The agitator blade stamping device according to claim 1, characterized in that, Multiple fixed sleeves (201) and cylinders (203) are provided. A connecting column (202) is fixedly installed on the inner wall of the fixed sleeve (201). A cavity (204) is provided inside the cylinder (203). The upper end of the connecting column (202) slides through the bottom surface of the cylinder (203) and extends into the cavity (204).

4. The agitator blade stamping device according to claim 3, characterized in that, A movable block (205) is slidably installed on the inner wall of the cavity (204). The upper end of the connecting column (202) is fixedly connected to the bottom surface of the movable block (205). An elastic element (206) is movably installed on the outer wall of the connecting column (202). The two ends of the elastic element (206) abut against the top surface of the fixed sleeve (201) and the bottom surface of the cylinder (203), respectively.

5. The agitator blade stamping device according to claim 4, characterized in that, The bottom surface of the fixing block (107) is fixedly installed with an abutment plate (211), and the top surface of the upper mold (108) is fixedly installed with a circular plate (210).

6. The agitator blade stamping device according to claim 5, characterized in that, The lower mold (102) has multiple limiting blocks (208) fixedly installed on its top surface, and limiting posts (209) fixedly installed on the top surface of the limiting blocks (208). The upper mold (108) has multiple limiting holes (207) through it, and the outer wall of the limiting post (209) is slidably connected to the inner wall of the limiting hole (207).

7. The agitator blade stamping device according to claim 1, characterized in that, The fixed plate (101) is provided with a cavity (301) and a groove (302). The side of the lifting plate (303) is slidably connected to the inner wall of the cavity (301). The side of the connecting plate (308) is slidably connected to the inner wall of the groove (302). The inner wall of the cavity (301) is provided with two mounting grooves (307). An elastic element (306) is fixedly installed on the inner wall of the mounting groove (307). The upper end of the elastic element (306) abuts against the bottom surface of the lifting plate (303).

8. The agitator blade stamping device according to claim 7, characterized in that, The lower mold (102) is provided with two through holes (305). The outer wall of the lifting column (304) is slidably connected to the inner wall of the through holes (305). The top surface of the lifting column (304) is flush with the inner wall of the lower mold (102).

9. The agitator blade stamping device according to claim 8, characterized in that, The fixed plate (101) is fixedly installed with a hinge block (310) and a concave frame (312) on its side. The hinge block (310) has a locking strip (311) hinged to its inner wall. The connecting plate (308) has a locking groove (309) on its side. The locking strip (311) is engaged with the locking groove (309). The side of the locking strip (311) is slidably connected to the inner wall of the concave frame (312). The fixed block (107) is fixedly installed with a connecting block (318) on its side. The bottom surface of the connecting block (318) is fixedly installed with a wedge strip (319). The side of the wedge strip (319) is slidably connected to the side of the locking strip (311).

10. A stirrer blade stamping device according to claim 9, characterized in that, The concave frame (312) has two connecting cavities (313) inside. A movable plate (315) is slidably installed on the inner wall of the connecting cavity (313). A second mounting groove (314) is provided on the inner wall of the connecting cavity (313). An elastic element (317) is fixedly installed on the inner wall of the second mounting groove (314). The other end of the elastic element (317) is fixedly connected to the movable plate (315). A hemisphere (316) is fixedly installed on the side of the two movable plates (315) close to each other. The hemisphere (316) slides through the inner wall of the connecting cavity (313) and extends to the outside of the concave frame (312). The outer wall of the hemisphere (316) is slidably connected to the side of the clip (311).