Wireless charger aging test device

Abstract

The invention relates to the technical field of testing devices, in particular to a wireless charger aging testing device which comprises a base, connecting plates are arranged on the two sides of the base, rotating seats are installed on the two connecting plates, a swing frame is installed between the two rotating seats, and two rotating shafts are installed on the two sides of the inner wall of the swing frame. Wherein a driving wheel is installed on one rotating shaft, a through opening is formed in the bottom of the swing frame, a detection load is installed between the two rotating shafts and located above the base, a first detection station corresponding to the lower portion of the detection load is arranged on the top face of the base, and a second detection station corresponding to the lower portion of the detection load is arranged on the top face of the base. The top surface of the base is provided with a second detection station, a driving relation is generated through a driving rod, a driving frame, a gear and other parts, the detection load is enabled to quickly switch the test direction in the front and back deflection directions, and the operation is also controlled by a hand wheel during operation, so that the operation is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of testing devices, and in particular to an aging testing device for a wireless charger. Background Art

[0002] A wireless charger is a charger that does not use a traditional charging power cord to connect to the terminal device that needs to be charged. It uses the latest wireless charging technology to transmit power to the load by using the alternating magnetic field generated between the coils. In order to ensure that the wireless charger meets the qualified requirements before leaving the factory, it is necessary to conduct a test before leaving the factory. The aging test is an important item used to detect the service life of the wireless charger.

[0003] The wireless charger consists of a charging base and a USB charging cable. During the aging test, the USB charging cable is connected to the charging base and the test load is placed on the charging base. After a long period of charging, the usage status of the test load is observed. If the display screen on the test load goes out, it proves that the charger is aged and has reached its life limit.

[0004] The USB charging cable is also part of the wireless charger. The above test method can only detect the service life of the charging stand, but does not complete the test of whether the USB charging cable is aging. This test method is relatively limited, and the accuracy of the aging test needs to be improved. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a wireless charger aging test device.

[0006] A wireless charger aging test device comprises a base, connecting plates are provided on both sides of the base, rotating seats are installed on the two connecting plates, a swing frame is installed between the two rotating seats, two rotating shafts are installed on both sides of the inner wall of the swing frame, a driving wheel is installed on one of the rotating shafts, a through opening is provided at the bottom of the swing frame, a detection load is installed between the two rotating shafts, the detection load is located above the base, a first detection station corresponding to the bottom of the detection load is provided on the top surface of the base, a second detection station is provided on the top surface of the base, the second detection station is provided on the front side of the first detection station and is perpendicular to the first detection station, the charging seat is located in the first detection station, the USB charging cable head is located on the second detection station, and a clamping mechanism is provided on the second detection station, and the USB charging cable head passes through the clamping mechanism The structure is installed on the second detection station and can drive the USB charging cable to be inserted into the USB socket of the charging seat. The swing frame is provided with a guide seat, and a guide hole is opened on the guide seat. A driving rod is installed in the guide hole. The clamping mechanism is provided with a driving frame, and the driving frame and the driving rod are in the same straight line. The bottom surface of the driving rod contacts the driving wheel. Driven by the clamping mechanism, when the USB charging cable is separated from the charging seat, the driving frame is also moved away from the driving rod, and the driving wheel is driven to rotate counterclockwise, and the detection load is driven by the rotating shaft to rotate upward; conversely, when the driving rod is inserted into the USB socket of the charging seat with the USB charging cable, the driving frame is also moved toward the driving rod, and the driving wheel is driven to rotate clockwise, and the detection load is driven by the rotating shaft to rotate downward.

[0007] Further preferably, the base is a hollow structure, and openings are provided at the bottom and front side of the base.

[0008] Further preferably, the swivel seat is a damping seat, and the swing frame can stop at a certain angle after rotating around the swivel seat.

[0009] Further preferably, the first inspection station is a groove sunken downwardly provided on the top surface of the base.

[0010] Further preferably, a display screen is provided on the top surface of the detection load.

[0011] Further preferably, the clamping mechanism includes a sliding seat slidingly fitted in the second inspection station, a clamping plate fixed on the top surface of the sliding seat, a threaded sleeve installed in the middle of the clamping plate, and a locking bolt installed on the threaded sleeve, and the bottom end of the locking bolt enters into the bottom side of the clamping plate to lock and fix the USB charging cable head.

[0012] Further preferably, the detection load includes a first detection part located at the rear end, and includes a second detection part installed at the front end of the first detection part, a clamping opening is opened at the front end of the second detection part, a detection rod is fixed in the clamping opening, the detection rod is U-shaped, one U-shaped bent end of the detection rod is close to the positive pole of the USB charging cable, and the other U-shaped bent end of the detection rod is close to the negative pole of the USB charging cable, when the USB charging cable is separated forward from the USB socket of the charging seat, one U-shaped bent end of the detection rod is against the positive pole of the USB charging cable, and at the same time, another U-shaped bent end of the detection rod is against the negative pole of the USB charging cable, one end of the detection rod located in the clamping opening is transferred into the clamping opening, and a torsion spring is provided between the detection rod and the clamping opening, and a rotation groove is opened at the bottom of the clamping opening, and the rotation groove corresponds to the U-shaped ends of the detection rod.

[0013] Further preferably, a gear is installed on the top surface of the base, a handwheel is installed on the top of the gear, the gear is located beside the slide, a rack is provided on the slide, the rack is meshed with the gear, and when the slide moves back and forth, the gear is driven to rotate by the rack.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. During the aging test of the charging stand, turn the handwheel to drive the gear to rotate clockwise, and the gear drives the slide to slide toward the charging stand. The slide drives the USB charging cable to move toward the charging stand, and the USB charging cable is inserted into the charging port of the charging stand. The driving frame moves with the slide and squeezes the driving rod to push the driving rod to move. The driving rod drives the driving wheel to rotate clockwise, and the driving wheel drives the rotating shaft to rotate. The rotating shaft drives the detection load to rotate. At this time, the first detection part on the rear end of the detection load rotates downward and places the induction part on the bottom surface on the top surface of the charging stand. The USB charging cable continues to charge the charging stand, and the charging stand continues to charge the detection load until the digital display on the display disappears. It is known that the charging stand is charging aged, and the time is recorded.

[0016] 2. After the aging test of the charging base is completed, reverse the handwheel, and the handwheel drives the gear to rotate counterclockwise, and the gear drives the slide to slide away from the charging base, and the slide drives the USB charging cable to move away from the charging base, the USB charging cable falls off the charging base, the driving frame moves away from the driving rod, the thrust on the driving rod disappears, the driving rod drives the driving wheel to rotate counterclockwise, the driving wheel drives the rotating shaft to rotate counterclockwise, and the rotating shaft drives the detection load to rotate. At this time, the first detection part on the rear end of the detection load rotates upward, and the sensing part on the bottom surface is separated from the top surface of the charging base, and the second detection part rotates downward, and the second detection part drives the clamping port to deflect downward, and the clamping port drives the detection rod to deflect downward, so that one end of the detection rod is against the positive electrode of the USB charging cable head, and the other end of the detection rod is against the negative electrode of the USB charging cable head. If the detection rod emits sparks, it proves that the USB charging cable head is normal and not aged.

[0017] 3. During the aging test of the charging stand and the USB charging cable, not only is a driving relationship established through the driving rod, driving frame, gears and other components, so that the detection load can quickly change the test position in the front and rear deflection directions, but the operation is also controlled by a hand wheel for easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a wireless charger aging test device provided by an embodiment of the present invention when in operation (a schematic diagram of a USB charging cable and a charging base placed on the test device for testing);

[0019] Figure 2 A wireless charger aging test device provided in an embodiment of the present invention comprises Figure 1 The enlarged schematic diagram of the A part is shown;

[0020] Figure 3 A wireless charger aging test device provided in an embodiment of the present invention comprises Figure 1 The enlarged schematic diagram of the B part is shown;

[0021] Figure 4 A wireless charger aging test device provided in an embodiment of the present invention comprises Figure 1 The side view of the plan view is shown below;

[0022] Figure 5 A wireless charger aging test device provided in an embodiment of the present invention comprises Figure 1 A schematic diagram from another perspective;

[0023] Figure 6 A wireless charger aging test device provided in an embodiment of the present invention comprises Figure 1 The schematic diagram from the bottom upward perspective is introduced;

[0024] Figure 7 A schematic diagram of a wireless charger aging test device in a non-working state provided by an embodiment of the present invention.

[0025] In the figure: 1. base; 2. connecting plate; 3. swivel seat; 4. swing frame; 5. rotating shaft; 6. detection load; 7. first detection station; 8. second detection station; 9. charging seat; 10. USB charging cable; 11. clamping mechanism; 12. through port; 13. guide seat; 14. guide hole; 15. driving rod; 16. driving frame; 17. driving wheel; 18. opening; 20. display screen; 21. slide seat; 22. clamping plate; 23. threaded sleeve; 24. locking bolt; 25. first detection part; 26. second detection part; 27. clamping port; 28. detection rod; 29., gear; 30. handwheel; 31. rack; 32. rotating groove. DETAILED DESCRIPTION

[0026] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0027] In one embodiment, Figure 1-Figure 7 As shown:

[0028] The present embodiment provides a wireless charger aging test device, including a base 1, connecting plates 2 are provided on both sides of the base 1, swivel seats 3 are installed on the two connecting plates 2, a swing frame 4 is installed between the two swivel seats 3, two rotating shafts 5 are installed on both sides of the inner wall of the swing frame 4, one of the rotating shafts 5 is installed with a driving wheel 17, a through opening 12 is provided at the bottom of the swing frame 4, a detection load 6 is installed between the two rotating shafts 5, the detection load 6 is located above the base 1, a first detection station 7 corresponding to the bottom of the detection load 6 is provided on the top surface of the base 1, a second detection station 8 is provided on the top surface of the base 1, the second detection station 8 is opened on the front side of the first detection station 7 and is perpendicular to the first detection station 7, a charging seat 9 is located in the first detection station 7, a USB charging cable head 10 is located on the second detection station 8, a clamping mechanism 11 is provided on the second detection station 8, and the USB charging cable head 10 is clamped by the clamping mechanism 11 It is installed on the second detection station 8 and can drive the USB charging cable 10 to be inserted into the USB socket of the charging seat 9. A guide seat 13 is provided on the swing frame 4, and a guide hole 14 is opened on the guide seat 13. A driving rod 15 is installed in the guide hole 14. A driving frame 16 is provided on the clamping mechanism 11. The driving frame 16 and the driving rod 15 are on the same straight line. The bottom surface of the driving rod 15 contacts the driving wheel 17. Driven by the clamping mechanism 11, when the USB charging cable 10 is separated from the charging seat 9, the driving frame 16 is simultaneously moved away from the driving rod 15, and the driving wheel 17 is driven to rotate counterclockwise, and the rotating shaft 5 drives the detection load 6 to rotate upward; conversely, when the driving rod 15 carries the USB charging cable 10 and is inserted into the USB socket of the charging seat 9, the driving frame 16 is simultaneously moved toward the driving rod 15, and the driving wheel 17 is driven to rotate clockwise, and the rotating shaft 5 drives the detection load 6 to rotate downward.

[0029] The base 1 is a hollow structure, and openings 18 are provided at the bottom and front side of the base 1 to reduce weight. When the charging stand 9 is powered on and undergoes a long-term aging test, heat is reduced through the openings 18 .

[0030] The swivel seat 3 is a damping seat, and the swing frame 4 can stop at a certain angle after rotating around the swivel seat 3.

[0031] The first inspection station 7 is a groove sunken downwardly provided on the top surface of the base 1 .

[0032] A display screen 20 is provided on the top surface of the detection load 6 .

[0033] The clamping mechanism 11 includes a slide 21 that is slidably fitted in the second inspection station 8, a clamping plate 22 fixed on the top surface of the slide 21, a threaded sleeve 23 installed in the middle of the clamping plate 22, and a locking bolt 24 installed on the threaded sleeve 23. The bottom end of the locking bolt 24 enters into the bottom side of the clamping plate 22 to lock and fix the USB charging cable 10.

[0034] The detection load 6 includes a first detection portion 25 located at the rear end, and the sensing portion is arranged on the bottom surface of the first detection portion 25. The first detection portion 25 is a traditional load detection portion. Different from the prior art, the detection load 6 also includes a second detection portion 26 installed at the front end of the first detection portion 25. The front end of the second detection portion 26 is provided with a clamping opening 27, and a detection rod 28 is fixed in the clamping opening 27. The detection rod 28 is U-shaped, and one U-shaped bending end of the detection rod 28 is close to the positive pole of the USB charging cable head 10, and the other U-shaped bending end of the detection rod 28 is close to the positive pole of the USB charging cable head 10. The U-shaped bent end is close to the negative pole of the USB charging cable 10. When the USB charging cable 10 is separated forward from the USB socket of the charging seat 9, one U-shaped bent end of the detection rod 28 is against the positive pole of the USB charging cable 10, and at the same time, another U-shaped bent end of the detection rod 28 is against the negative pole of the USB charging cable 10. One end of the detection rod 28 located in the clamping opening 27 is transferred to the clamping opening 27, and a torsion spring is provided between the clamping opening 27. A rotation groove 32 is provided at the bottom of the clamping opening 27, and the rotation groove 32 corresponds to the U-shaped ends of the detection rod 28. When the first detection part 25 of the detection load 6 rotates downward, the induction unit on its bottom surface touches the charging seat 9 for wireless charging, and performs a long-term aging test on the charging seat 9. After the aging test of the charging seat 9 is completed, the second detection part 26 rotates downward, and the first detection part 25 rotates upward. The charging seat 9 is no longer charged. At this time, the second detection part 26 will rotate downward with the clamping mouth 27, and one end of the detection rod 28 is against the positive pole of the USB charging cable head 10, and the other end is against the negative pole of the USB charging cable head 10. Use short-circuit detection technology to observe whether sparks appear on the detection rod 28. If sparks appear, it proves that the USB charging cable head 10 is intact. On the contrary, the USB charging cable head 10 also ages and self-damages when the charging seat 9 is tested for a long time.

[0035] A gear 29 is installed on the top surface of the base 1, and a hand wheel 30 is installed on the top of the gear 29. The gear 29 is located beside the slide 21. A rack 31 is provided on the slide 21. The rack 31 is engaged with the gear 29, and when the slide 21 moves back and forth, the gear 29 is driven to rotate through the rack 31.

[0036] Working principle and effect: Press Figure 1As shown, the USB charging cable 10 is inserted into the space between the clamping plate 22 and the slide 21, and the USB charging cable 10 is locked and fixed on the slide 21 by the locking bolt 24. The charging seat 9 is placed on the first detection station 7, and the groove structure of the first detection station 7 is used to quickly position the charging seat 9, while ensuring that the charging port on the charging seat 9 is opposite to the USB charging cable 10, and the hand wheel 30 is turned to drive the gear 29 to rotate clockwise, and the gear 29 drives the slide 21 to slide toward the charging seat 9, and the slide 21 drives the USB charging cable 10 to move toward the charging seat 9, and the USB The charging cable 10 is inserted into the charging port of the charging seat 9, and the driving frame 16 moves with the slide 21 and squeezes on the driving rod 15 to push the driving rod 15 to move. The driving rod 15 drives the driving wheel 17 to rotate clockwise, and the driving wheel 17 drives the rotating shaft 5 to rotate, and the rotating shaft 5 drives the detection load 6 to rotate. At this time, the first detection part 25 on the rear end of the detection load 6 rotates downward and places the sensing part on the bottom surface on the top surface of the charging seat 9. The USB charging cable 10 continues to charge the charging seat 9, and the charging seat 9 continues to charge the detection load 6 until the digital display on the display screen 20 disappears, and it is known that the charging seat 9 is charging and aging, and the time is recorded. After the aging degree test of the charging seat 9 is completed, the hand wheel 30 is reversed, and the hand wheel 30 drives the gear 29 to rotate counterclockwise, and the gear 29 drives the slide 21 to slide away from the charging seat 9, and the slide 21 drives the USB charging cable 10 to move away from the charging seat 9, and the USB charging cable 10 falls off from the charging seat 9, and the driving frame 16 moves away from the driving rod 15, and the thrust on the driving rod 15 disappears, and the driving rod 15 drives the driving wheel 17 to rotate counterclockwise, and the driving wheel 17 drives the rotating shaft 5 to rotate counterclockwise, and the rotating shaft 5 drives the detection load 6 to rotate, and at this time, the first detection part 25 on the rear end of the detection load 6 moves to The second detection part 26 rotates upward, and the sensing part on the bottom surface is separated from the top surface of the charging seat 9, and the second detection part 26 rotates downward, and the second detection part 26 drives the clamping port 27 to deflect downward, and the clamping port 27 drives the detection rod 28 to deflect downward, so that one end of the detection rod 28 is against the positive electrode sheet of the USB charging cable head 10, and the other end of the detection rod 28 is against the negative electrode sheet of the USB charging cable head 10. If the detection rod 28 emits sparks, it proves that the USB charging cable head 10 is normal and not aged. At this time, you can also watch whether the plug indicator light where the USB charging cable head 10 is located is glowing. If it glows, the charging line is normal and not aged. On the contrary, the USB charging cable head 10 or the charging line where the USB charging cable head 10 is located is normal and not aged. When performing the above-mentioned aging test, not only is a driving relationship generated through the drive rod 15, the drive frame 16 and the gear and other components, so that the detection load 6 can quickly change the test position in the front and rear deflection directions, but also the hand wheel 30 is used to control the operation, which is convenient for operation.

[0037] In summary, the charger aging test device can not only perform an aging test on the wireless charging seat 9, but also perform an aging test on the USB charging cable 10 after the aging test of the wireless charging seat 9 is completed. Since the USB charging cable 10 (also referred to as the charging cable) and the charging seat 9 are two parts of the wireless charger, the present invention can meet the requirement of testing the aging degree of both parts.

[0038] It needs to be further explained that the detection load 6 mentioned in the present invention is a prior art. After the wireless charger is produced, the anti-aging degree of the charging stand 9 is tested by the detection load 6 in most cases. Therefore, the principle of the detection load 6 used in the present invention will not be repeated. For example, the detection load 6 can be simply understood as a mobile phone with a display screen.

[0039] like Figure 2 As shown, the bottom of the driving rod 15 is provided with a spring rod (composed of a spring and a rod, one end of the rod is bent upward and connected to the driving rod 15, the other end of the rod passes through the guide seat 13, the spring is sleeved on the rod, one end of the spring is elastically supported on the bent portion of one end of the rod, and the other end is elastically supported on the guide seat 13. When the driving frame 16 is pressed on the driving rod 15 and pushes the driving rod 15 to move, the spring rod moves backward, and the spring on the rod is compressed and shortened. Conversely, when the driving frame 16 moves away from the driving rod 15, the thrust on the driving rod 15 disappears, the spring elastically lengthens, and the front end is used to push the driving frame 16 forward back to its original position.

[0040] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described according to their actual installation and actual use as well as the customary orientations of technicians in this field. This is hereby explained.

[0041] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wireless charger aging test device, characterized in that: The invention comprises a base (1), wherein two connecting plates (2) are provided on the two connecting plates (2), a rotating seat (3) is installed on the two rotating seats (3), a swing frame (4) is installed between the two rotating seats (3), two rotating shafts (5) are installed on the inner wall of the swing frame (4), one of the rotating shafts (5) is installed with a driving wheel (17), a through opening (12) is provided at the bottom of the swing frame (4), a detection load (6) is installed between the two rotating shafts (5), the detection load (6) is located above the base (1), and a corresponding detection load (6) is provided on the top surface of the base (1). A first detection station (7) is provided below the detection load (6); a second detection station (8) is provided on the top surface of the base (1); the second detection station (8) is provided in front of the first detection station (7) and is perpendicular to the first detection station (7); a charging seat (9) is located in the first detection station (7); a USB charging cable (10) is located on the second detection station (8); a clamping mechanism (11) is provided on the second detection station (8); and the USB charging cable (10) is installed on the second detection station through the clamping mechanism (11). (8) and can drive a USB charging cable (10) to be inserted into a USB socket of a charging seat (9); a guide seat (13) is provided on the swing frame (4); a guide hole (14) is provided on the guide seat (13); a driving rod (15) is installed in the guide hole (14); a driving frame (16) is provided on the clamping mechanism (11); the driving frame (16) and the driving rod (15) are in the same straight line; the bottom surface of the driving rod (15) contacts the driving wheel (17); and under the drive of the clamping mechanism (11), the USB charging cable (10) is inserted into a USB socket of a charging seat (9); a driving frame (16) is provided on the clamping mechanism (11); and the driving frame (16) and the driving rod (15) are in the same straight line; the bottom surface of the driving rod (15) contacts the driving wheel (17); and under the drive of the clamping mechanism (11), the USB charging cable (10) is inserted into a USB socket of a charging seat (9); a driving frame (13) is provided on the swing frame (4); and a driving frame (16) is provided on the clamping mechanism (11); and the driving frame (16) and the driving rod (15) are in the same straight line; and the bottom surface of the driving rod (15) contacts the driving wheel (17). When the USB charging cable (10) is separated from the charging seat (9), the driving frame (16) is simultaneously moved away from the driving rod (15), and the driving wheel (17) is driven to rotate counterclockwise, and the detection load (6) is driven by the rotating shaft (5) to rotate upward; on the contrary, when the driving rod (15) is inserted into the USB socket of the charging seat (9) with the USB charging cable (10), the driving frame (16) is simultaneously moved toward the driving rod (15), and the driving wheel (17) is driven to rotate clockwise, and the detection load (6) is driven by the rotating shaft (5) to rotate downward.

2. The wireless charger aging test device according to claim 1, characterized in that: The base (1) is a hollow structure, and openings (18) are provided at the bottom and front side of the base (1).

3. The wireless charger aging test device according to claim 2, characterized in that: The rotating seat (3) is a damping seat, and the swing frame (4) can stop at a certain angle after rotating around the rotating seat (3).

4. The wireless charger aging test device according to claim 3, characterized in that: The first detection station (7) is a groove sunken downwardly provided on the top surface of the base (1).

5. The wireless charger aging test device according to claim 4, characterized in that: A display screen (20) is provided on the top surface of the detection load (6).

6. The wireless charger aging test device according to claim 5, characterized in that: The clamping mechanism (11) includes a slide seat (21) that is slidably fitted in the second inspection station (8), a clamping plate (22) fixed on the top surface of the slide seat (21), a threaded sleeve (23) installed in the middle of the clamping plate (22), and a locking bolt (24) installed on the threaded sleeve (23), wherein the bottom end of the locking bolt (24) enters into the bottom side of the clamping plate (22) to lock and fix the USB charging cable (10).

7. The wireless charger aging test device according to claim 6, characterized in that: The detection load (6) comprises a first detection portion (25) located at the rear end, and a second detection portion (26) installed at the front end of the first detection portion (25); a clamping opening (27) is provided at the front end of the second detection portion (26); a detection rod (28) is fixed in the clamping opening (27); the detection rod (28) is U-shaped, one U-shaped bending end of the detection rod (28) is close to the positive pole of the USB charging cable (10), and the other U-shaped bending end of the detection rod (28) is close to the negative pole of the USB charging cable (10); the USB charging cable (10) When separating forward from the USB socket of the charging seat (9), one U-shaped bent end of the detection rod (28) abuts against the positive pole of the USB charging cable (10), and at the same time, another U-shaped bent end of the detection rod (28) abuts against the negative pole of the USB charging cable (10); one end of the detection rod (28) located in the clamping opening (27) is transferred into the clamping opening (27), and a torsion spring is provided between the detection rod (28) and the clamping opening (27); a rotation groove (32) is provided at the bottom of the clamping opening (27), and the rotation groove (32) corresponds to the two U-shaped ends of the detection rod (28).

8. The wireless charger aging test device according to claim 7, characterized in that: A gear (29) is installed on the top surface of the base (1), a hand wheel (30) is installed on the top of the gear (29), the gear (29) is located beside the slide (21), a rack (31) is provided on the slide (21), the rack (31) is meshed with the gear (29), and when the slide (21) moves forward and backward, the gear (29) is driven to rotate through the rack (31).

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