Contact size measuring machine for mobile phone camera support
By using a limiting cavity and limiting module in conjunction with a rotary motor, transmission mechanism and pushing mechanism, the problems of clamp obstruction and uneven force distribution when measuring mobile phone camera brackets by coordinate measuring machines are solved, achieving comprehensive and uniform measurement and cost reduction.
Patent Information
- Application Number
- CN202511441313.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-10
- Publication Date
- 2026-02-03
AI Technical Summary
When measuring mobile phone camera brackets, existing coordinate measuring machines use clamps to fix the probe in place, which prevents the probe from measuring the clamped area. Furthermore, the clamps obstruct the sides, causing uneven force distribution and increasing production costs.
By using a limiting cavity and limiting module in conjunction with a rotary motor, transmission mechanism and pushing mechanism, the mobile phone camera bracket can be flipped and fully measured, avoiding the need for fixture fixation and reducing production costs.
It achieves comprehensive and uniform measurement of mobile phone camera brackets, avoids clamp obstruction, and reduces production costs.
Smart Images
Figure CN121452976A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of measuring machine technology, specifically to a contact-type dimensional measuring machine for a mobile phone camera holder. Background Technology
[0002] A coordinate measuring machine (CMM) is a high-precision contact-type three-dimensional dimensional measuring device that can be used to measure the complex structures of mobile phone camera brackets (such as mounting holes, positioning posts, stepped surfaces, curved surfaces, etc.). Through the cooperation of multiple intelligent sensors such as contact probes, laser line scanning sensors, and white light interferometers, the CMM accurately measures the three-dimensional dimensions and geometric tolerances such as length, width, height, aperture, spacing, perpendicularity, parallelism, and position, meeting the high precision requirements of mobile phone parts.
[0003] When measuring a mobile phone camera bracket with a coordinate measuring machine (CMM), a special fixture for the camera bracket needs to be installed on the top of the measuring table to fix it in place before dimensional measurement can be performed. Because mobile phone camera brackets are small, the fixtures used are typically precision miniature fixtures. These fixtures clamp a specific part of the camera bracket to secure it to the top of the measuring table. However, this clamping method prevents the contact probe from measuring the clamped area, and the fixture's limitations also obstruct the sides of the camera bracket. Using only one fixture can cause uneven stress on the bracket, leading to tilting and affecting the contact probe's dimensional measurements. Using multiple fixtures requires multiple corresponding mobile devices and power supplies, increasing overall production costs. Summary of the Invention
[0004] The purpose of this invention is to provide a contact-type dimension measuring machine for mobile phone camera brackets to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a contact-type dimensional measuring machine for a mobile phone camera holder, comprising a worktable, a moving device fixedly installed at one end of the top of the worktable, a measuring device connected to the moving device, and a mobile phone camera holder. A base is fixedly installed on the top of the worktable, a rotary motor is fixedly installed on one side of the top of the base, a rotating plate is fixedly installed on the output shaft end of the rotary motor, a mounting seat one and a mounting seat two are provided on the side of the rotating plate away from the rotary motor, a limiting cavity is formed at the end of the mounting seat one near the mounting seat two, and a limiting module is fixedly installed on the side of the mounting seat two near the mounting seat one. The limiting cavity and the limiting module both cooperate with the mobile phone camera holder. A pushing mechanism is provided on the top of the base, and a transmission mechanism is provided on one side of both the mounting seat one and the mounting seat two.
[0006] Preferably, the transmission mechanism includes a slide rod and a connecting groove. The slide rod is fixedly connected to a corresponding mounting base one and a mounting base two. The connecting groove is opened at one end of the rotating plate. The end of the connecting groove near the middle of the rotating plate is connected to a groove. The groove and the connecting groove cooperate with the slide rod. The slide rod is provided with a displacement component on the side near the rotating motor.
[0007] Preferably, the displacement component includes a trapezoidal push block, a push plate is fixedly installed at one end of the top of the trapezoidal push block, a strip groove is opened inside the trapezoidal push block, a rectangular slider is slidably installed inside the strip groove, a transmission plate is rotatably installed on the side of the rectangular slider away from the rotating plate, the end of the transmission plate away from the rectangular slider is rotatably connected to a corresponding slide rod, and a limit component is provided inside the trapezoidal push block.
[0008] Preferably, the limiting component includes a limiting block and a limiting groove. The limiting block is slidably installed inside one end of the trapezoidal pushing block. The limiting block and the limiting groove cooperate with each other. The limiting groove is opened at one end of the rotating plate near the rotating motor. A triangular block is fixedly installed on one side of the limiting block. A spring is fixedly installed between the side of the triangular block away from the limiting block and the inner wall of the trapezoidal pushing block.
[0009] Preferably, the pushing mechanism includes a cylinder, which is fixedly installed on the top of the base. An L-shaped bracket is fixedly installed on the telescopic shaft end of the cylinder. A push rod is fixedly installed on the side of the L-shaped bracket away from the cylinder. The push rod cooperates with the triangular block. A connecting component is provided at the end of the L-shaped bracket away from the cylinder.
[0010] Preferably, the connecting assembly includes a snap-fit plate, two extension blocks, and two L-shaped pressure rods. The snap-fit plate is slidably installed inside the L-shaped bracket. A spring is fixedly installed between the bottom of the snap-fit plate and the inner wall of the L-shaped bracket. The end of the snap-fit plate away from the top rod is an inclined surface. The two extension blocks and the two L-shaped pressure rods cooperate with the snap-fit plate. The two extension blocks are fixedly connected to two trapezoidal push blocks, and the two L-shaped pressure rods are fixedly connected to two slide rods.
[0011] Preferably, two side blocks are fixedly installed on the side of each of the two sliding rods that are far apart from each other, and two adjacent side blocks are respectively arranged on both sides of the rotating plate.
[0012] Preferably, a top plate is slidably installed inside the mounting base one, a transmission groove is provided at the bottom of the top plate, a transmission rod is movably installed inside the transmission groove, a strip rod is fixedly installed on one side of the transmission rod, the strip rod is slidably fitted inside the corresponding slide rod, a spring three is sleeved on the outside of the strip rod, a push block one is fixedly installed at the end of the strip rod away from the transmission rod, and a push block two is fixedly installed on the side of the rotating plate near the rotating motor, the push block one and the push block two cooperate with each other.
[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. The mobile phone camera bracket is limited by the limiting cavity in mounting base one and the limiting module in mounting base two, which replaces the existing technology of clamping and fixing a certain part of the mobile phone camera bracket with a micro clamp. Through the cooperation of the rotary motor, transmission mechanism and pushing mechanism, the mobile phone camera bracket is flipped. This allows the contact probe in the measuring device to work with other smart sensors to perform comprehensive dimensional measurement of the mobile phone camera bracket. The force is uniform during the measurement of the mobile phone camera bracket, and there is no need to configure additional mobile equipment and driving power supply, thus reducing the overall production cost.
[0014] 2. As mounting base one moves upward away from mounting base two, the ejector plate, in cooperation with push block one, push block two, spring three, transmission rod, and transmission groove, acts on the mobile phone camera bracket, which helps the mobile phone camera bracket to disengage from the limiting cavity and prevents the mobile phone camera bracket from moving synchronously with mounting base one and failing to cover the top of the limiting module for the next measurement. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the base structure of the present invention; Figure 3 This is a partial structural diagram of the present invention; Figure 4 This is a schematic diagram of the rotating plate structure of the present invention; Figure 5 This is a schematic diagram of the structure of mounting base one and mounting base two of the present invention; Figure 6 This is a schematic diagram of the mounting base of the present invention; Figure 7 This is a cross-sectional view of the mounting base of the present invention; Figure 8 This is a schematic diagram of the actuation mechanism of the present invention; Figure 9 This is a schematic diagram of the trapezoidal pusher block structure of the present invention; Figure 10This is a schematic diagram of the internal structure of one end of the L-shaped bracket of the present invention; Figure 11 This is a schematic diagram of the internal structure of the trapezoidal pusher block of the present invention.
[0016] The components represented by each number in the attached diagram are listed below: 1. Worktable; 2. Moving device; 3. Measuring device; 4. Base; 5. Rotary motor; 6. Rotating plate; 7. Mounting seat one; 8. Limiting cavity; 9. Mounting seat two; 10. Limiting module; 11. Mobile phone camera bracket; 12. Slide rod; 13. Connecting groove; 14. Trapezoidal push block; 15. Push plate; 16. Strip groove; 17. Rectangular slider; 18. Transmission plate; 19. Limiting... 20. Positioning block; 21. Limiting groove; 22. Triangular block; 23. Spring 1; 24. Cylinder; 25. L-shaped bracket; 26. Push rod; 27. Snap-fit plate; 28. Spring 2; 29. Extension block; 30. L-shaped pressure rod; 31. Side stop block; 32. Ejector plate; 33. Transmission groove; 34. Transmission rod; 35. Strip rod; 36. Spring 3; 37. Push block 1; 38. Push block 2; 39. Groove; 40. T-shaped slider; 41. T-shaped slide groove. Detailed Implementation
[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0018] This invention provides a technical solution: such as Figures 1-11 The mobile phone camera holder contact dimension measuring machine shown includes a worktable 1, a moving device 2 fixedly installed at one end of the top of the worktable 1, a measuring device 3 connected to the moving device 2, and a mobile phone camera holder 11. A base 4 is fixedly installed on the top of the worktable 1. A rotary motor 5 is fixedly installed on one side of the top of the base 4. A rotating plate 6 is fixedly installed on the output shaft end of the rotary motor 5. A mounting seat 1 7 and a mounting seat 2 9 are provided on the side of the rotating plate 6 away from the rotary motor 5. A limiting cavity 8 is opened at the end of the mounting seat 1 7 near the mounting seat 2 9. A limiting module 10 is fixedly installed on the side of the mounting seat 2 9 near the mounting seat 1 7. The limiting cavity 8 and the limiting module 10 cooperate with the mobile phone camera holder 11. A pushing mechanism is provided on the top of the base 4. A transmission mechanism is provided on one side of both the mounting seat 1 7 and the mounting seat 2 9.
[0019] The transmission mechanism includes a slide rod 12 and a connecting groove 13. The slide rod 12 is fixedly connected to the corresponding mounting base 7 and mounting base 9 respectively. The connecting groove 13 is opened at one end of the rotating plate 6. The end of the connecting groove 13 near the middle of the rotating plate 6 is connected to a groove 38. The groove 38 and the connecting groove 13 are both in cooperation with the slide rod 12. The slide rod 12 is provided with a displacement component on the side near the rotating motor 5.
[0020] The displacement assembly includes a trapezoidal push block 14, a push plate 15 is fixedly installed at one end of the top of the trapezoidal push block 14, a strip groove 16 is opened inside the trapezoidal push block 14, a rectangular slider 17 is slidably installed inside the strip groove 16, a transmission plate 18 is rotatably installed on the side of the rectangular slider 17 away from the rotating plate 6, and the end of the transmission plate 18 away from the rectangular slider 17 is rotatably connected to the corresponding slide rod 12. A limit component is provided inside the trapezoidal push block 14.
[0021] The limiting component includes a limiting block 19 and a limiting groove 20. The limiting block 19 is slidably installed inside one end of the trapezoidal push block 14. The limiting block 19 and the limiting groove 20 cooperate with each other. The limiting groove 20 is opened at one end of the rotating plate 6 near the rotating motor 5. A triangular block 21 is fixedly installed on one side of the limiting block 19. A spring 22 is fixedly installed between the side of the triangular block 21 away from the limiting block 19 and the inner wall of the trapezoidal push block 14.
[0022] The pushing mechanism includes a cylinder 23, which is fixedly installed on the top of the base 4. An L-shaped bracket 24 is fixedly installed on the telescopic shaft end of the cylinder 23. A push rod 25 is fixedly installed on the side of the L-shaped bracket 24 away from the cylinder 23. The push rod 25 cooperates with the triangular block 21. A connecting component is provided inside the L-shaped bracket 24 at the end away from the cylinder 23.
[0023] The connecting assembly includes a snap-fit plate 26, two extension blocks 28, and two L-shaped pressure rods 29. The snap-fit plate 26 is slidably installed inside the L-shaped bracket 24. A spring 27 is fixedly installed between the bottom of the snap-fit plate 26 and the inner wall of the L-shaped bracket 24. The end of the snap-fit plate 26 away from the top rod 25 is an inclined surface. The two extension blocks 28 and the two L-shaped pressure rods 29 cooperate with the snap-fit plate 26. The two extension blocks 28 are fixedly connected to the two trapezoidal push blocks 14 respectively, and the two L-shaped pressure rods 29 are fixedly connected to the two slide rods 12 respectively.
[0024] Two side blocks 30 are fixedly installed on the side of each of the two sliding rods 12 that are far apart from each other, and the two adjacent side blocks 30 are respectively set on both sides of the rotating plate 6.
[0025] An ejector plate 31 is slidably installed inside the mounting base 7. A transmission groove 32 is provided at the bottom of the ejector plate 31. A transmission rod 33 is movably installed inside the transmission groove 32. A strip rod 34 is fixedly installed on one side of the transmission rod 33. The strip rod 34 is slidably fitted inside the corresponding slide rod 12. A spring 35 is sleeved on the outside of the strip rod 34. A push block 36 is fixedly installed at the end of the strip rod 34 away from the transmission rod 33. A push block 37 is fixedly installed on the side of the rotating plate 6 near the rotating motor 5. Push block 36 and push block 37 cooperate with each other.
[0026] Working principle: The initial positions of mounting base 7 and mounting base 9 are as follows... Figure 2 As shown, when in use, the mobile phone camera bracket 11 is first placed inside the limiting cavity 8. Then, the top of the mobile phone camera bracket 11 is fully measured by the contact probe in the measuring device 3 and the moving device 2. After the top measurement of the mobile phone camera bracket 11 is completed, the cylinder 23 pushes the L-shaped bracket 24 to move horizontally, so that the mounting base 29 moves directly above the mounting base 17. During this process, the movement of the transmission mechanism and the pushing mechanism on one side of the mounting base 29 is as follows: At this time, the snap-fit plate 26 is located on the side of the corresponding extension block 28. While the L-shaped bracket 24 moves, it can drive the trapezoidal pushing block 14 and the slide rod 12 to slide along the connecting groove 13. While the trapezoidal pushing block 14 moves, it drives the T-shaped slider 39 at one end of the pushing plate 15 to slide inside the corresponding T-shaped slide groove 40. When the slide rod 12 slides directly above the groove 38, as the L-shaped bracket 24 continues to move, the trapezoidal pushing block 14 moves synchronously with the L-shaped bracket 24, while the slide rod 12 slides downward along the groove 38 under the action of gravity. The transmission plate 18 rotates accordingly. The rectangular slider 17 at one end slides accordingly inside the strip groove 16. As the slider 12 moves downward, the L-shaped pressure bar 29 on one side acts on the snap-fit plate 26, causing the snap-fit plate 26 to move downward and press the spring 27 at its bottom. When the slider 12 has not fallen to the bottom of the groove 38, the top of the snap-fit plate 26 is lower than the bottom of the extension block 28. As the L-shaped bracket 24 continues to move, it will not continue to drive the trapezoidal push block 14 to move. However, under the automatic gravity of the slider 12, the slider 12 can move to the bottom of the groove 38. One end of the slider 12 acts on the inclined surface of the trapezoidal push block 14, and the trapezoidal push block 14 can move to the limit position. Then, under the action of the spring 22, the limiting block 19 is inserted into the limiting groove 20, thereby fixing the trapezoidal push block 14 and the corresponding slider 12. During the above process, mounting base 29 descends, causing the limiting module 10 to extend into the mobile phone camera bracket 11. Subsequently, the rotary motor 5 is started, causing the rotating plate 6, mounting base 17, and mounting base 29 to rotate 180 degrees, thus swapping the positions of mounting base 17 and mounting base 29. Then, the cylinder 23 is started, causing the L-shaped bracket 24 to reset. During this process, the movement of the transmission mechanism and the pushing mechanism on one side of mounting base 17 is as follows: the L-shaped bracket 24 drives the top rod 25 to move synchronously. When the top rod 25 extends into the trapezoidal pushing block 14, the top rod 25 acts on the triangular block 21. The triangular block 21 is forced to compress the spring 1 22 and causes the limiting block 19 to disengage from the limiting groove 20. At the same time, when the extension block 28 acts on the locking mechanism... Plate 26, the snap-fit plate 26 moves downward under force and squeezes the second spring 27 at its bottom. As the L-shaped bracket 24 drives the snap-fit plate 26 to continue moving, when the snap-fit plate 26 is misaligned with the extension block 28, the snap-fit plate 26 moves upward under the action of the second spring 27. The snap-fit plate 26 is located on the side of the extension block 28 close to the slide rod 12. As the L-shaped bracket 24 continues to move, the trapezoidal push block 14 and the push plate 15 move synchronously. The slide rod 12 slides upward under force to the top of the groove 38. As the L-shaped bracket 24 continues to move, the slide rod 12 slides inside the connecting groove 13, thereby driving the second mounting base 9 away from the top of the first mounting base 7, so that the mobile phone camera bracket 11 covers the top of the limiting module 10. As the sliding rod 12 on one side of the mounting base 7 moves upward along the corresponding groove 38, the push block 36 moves away from the push block 37. Under the action of the spring 35, the strip rod 34 drives the transmission rod 33 to move into the mounting base 7. The transmission rod 33 slides inside the transmission groove 32, causing the ejector plate 31 to act on the mobile phone camera bracket 11. This helps the mobile phone camera bracket 11 to disengage from the limiting cavity 8, preventing the mobile phone camera bracket 11 from moving synchronously with the mounting base 7 and failing to cover the top of the limiting module 10 for the next measurement. Subsequently, the contact probe in the measuring device 3 can measure the bottom and sides of the mobile phone camera bracket 11. Measurements are performed by limiting the mobile phone camera bracket 11 through the limiting cavity 8 in mounting base 1 7 and the limiting module 10 in mounting base 2 9, which replaces the existing method of clamping and fixing a certain part of the mobile phone camera bracket 11 with a micro clamp. Through the cooperation of the rotary motor 5, the transmission mechanism and the push mechanism, the mobile phone camera bracket 11 is flipped, so that the contact probe in the measuring device 3 can work with other multiple smart sensors to perform comprehensive dimensional measurements of the mobile phone camera bracket 11. The force is uniform when measuring the mobile phone camera bracket 11, and there is no need to configure additional mobile equipment and driving power supply, thus reducing the overall production cost.
[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A contact-type dimension measuring machine for a mobile phone camera holder, comprising a worktable (1), a moving device (2) fixedly installed at one end of the top of the worktable (1), a measuring device (3) connected to the moving device (2), and a mobile phone camera holder (11), characterized in that: A base (4) is fixedly installed on the top of the workbench (1). A rotary motor (5) is fixedly installed on one side of the top of the base (4). A rotating plate (6) is fixedly installed on the output shaft end of the rotary motor (5). A mounting seat one (7) and a mounting seat two (9) are provided on the side of the rotating plate (6) away from the rotary motor (5). A limiting cavity (8) is opened at the end of the mounting seat one (7) near the mounting seat two (9). A limiting module (10) is fixedly installed on the side of the mounting seat two (9) near the mounting seat one (7). The limiting cavity (8) and the limiting module (10) cooperate with the mobile phone camera bracket (11). A pushing mechanism is provided on the top of the base (4). A transmission mechanism is provided on one side of the mounting seat one (7) and the mounting seat two (9).
2. The mobile phone camera bracket contact-type dimension measuring machine according to claim 1, characterized in that: The transmission mechanism includes a slide rod (12) and a connecting groove (13). The slide rod (12) is fixedly connected to the corresponding mounting base one (7) and mounting base two (9) respectively. The connecting groove (13) is opened at one end of the rotating plate (6). The end of the connecting groove (13) near the middle of the rotating plate (6) is connected to a groove (38). The groove (38) and the connecting groove (13) are both in cooperation with the slide rod (12). The slide rod (12) is provided with a displacement component on the side near the rotating motor (5).
3. The mobile phone camera bracket contact-type dimension measuring machine according to claim 2, characterized in that: The displacement component includes a trapezoidal push block (14), a push plate (15) is fixedly installed at one end of the top of the trapezoidal push block (14), a strip groove (16) is provided inside the trapezoidal push block (14), a rectangular slider (17) is slidably installed inside the strip groove (16), a transmission plate (18) is rotatably installed on the side of the rectangular slider (17) away from the rotating plate (6), and the end of the transmission plate (18) away from the rectangular slider (17) is rotatably connected to the corresponding slide rod (12). A limit component is provided inside the trapezoidal push block (14).
4. The mobile phone camera bracket contact-type dimension measuring machine according to claim 3, characterized in that: The limiting component includes a limiting block (19) and a limiting groove (20). The limiting block (19) is slidably installed inside one end of the trapezoidal push block (14). The limiting block (19) and the limiting groove (20) cooperate with each other. The limiting groove (20) is opened at one end of the rotating plate (6) near the rotating motor (5). A triangular block (21) is fixedly installed on one side of the limiting block (19). A spring (22) is fixedly installed between the side of the triangular block (21) away from the limiting block (19) and the inner wall of the trapezoidal push block (14).
5. A contact-type dimension measuring machine for a mobile phone camera holder according to claim 1, characterized in that: The pushing mechanism includes a cylinder (23), which is fixedly installed on the top of the base (4). An L-shaped bracket (24) is fixedly installed on the telescopic shaft end of the cylinder (23). A push rod (25) is fixedly installed on the side of the L-shaped bracket (24) away from the cylinder (23). The push rod (25) cooperates with the triangular block (21). A connecting component is provided inside the L-shaped bracket (24) at the end away from the cylinder (23).
6. The mobile phone camera bracket contact-type dimension measuring machine according to claim 5, characterized in that: The connecting assembly includes a snap-fit plate (26), two extension blocks (28), and two L-shaped pressure rods (29). The snap-fit plate (26) is slidably installed inside the L-shaped bracket (24). A spring (27) is fixedly installed between the bottom of the snap-fit plate (26) and the inner wall of the L-shaped bracket (24). The end of the snap-fit plate (26) away from the top rod (25) is an inclined surface. The two extension blocks (28) and the two L-shaped pressure rods (29) cooperate with the snap-fit plate (26). The two extension blocks (28) are fixedly connected to the two trapezoidal push blocks (14), and the two L-shaped pressure rods (29) are fixedly connected to the two slide rods (12).
7. A contact-type dimension measuring machine for a mobile phone camera holder according to claim 2, characterized in that: Two side blocks (30) are fixedly installed on the side of each of the two sliding rods (12) that are far apart from each other. The two adjacent side blocks (30) are respectively set on both sides of the rotating plate (6). A T-shaped slider (39) is fixedly installed on one end of each of the two push plates (15). A T-shaped groove (40) is opened on the top of each of the rotating plates (6). The two T-shaped sliders (39) cooperate with the two T-shaped grooves (40) respectively.
8. The mobile phone camera bracket contact-type dimension measuring machine according to claim 1, characterized in that: An ejector plate (31) is slidably installed inside the mounting base (7). A transmission groove (32) is provided at the bottom of the ejector plate (31). A transmission rod (33) is movably installed inside the transmission groove (32). A strip rod (34) is fixedly installed on one side of the transmission rod (33). The strip rod (34) is slidably fitted inside the corresponding slide rod (12). A spring (35) is sleeved on the outside of the strip rod (34). A push block (36) is fixedly installed at the end of the strip rod (34) away from the transmission rod (33). A push block (37) is fixedly installed on the side of the rotating plate (6) near the rotating motor (5). The push block (36) and the push block (37) cooperate with each other.