A hole position detection device for automobile parts

Abstract

The invention provides a hole position detection device for automobile parts, which relates to the technical field of hole spacing measurement, and comprises a driving mechanism, a flip assembly, a guide assembly and a measuring mechanism. A motor is screwed on the bottom of the driving mechanism, a bottom plate is screwed on the bottom of the motor housing, a lower baffle is integrally formed on the middle of the surface of the bottom plate, an upper baffle is welded on the top of the lower baffle, a support plate is integrally formed at the top edge of the upper baffle, and a pushing assembly is screwed on the surface of the support plate. The invention supports the inner wall of the hole of the part to be measured by a guide rod and a measuring rod at the same time, and the diameter measurement can be completed by cooperating with the measuring mechanism at the end, so that proportional expansion can be achieved by extending the measuring area, thereby improving the accuracy of measurement reading. The whole process does not require manual clamping operation, and does not require the installation of additional sensors, thereby improving the stability of the detection process, and can efficiently and automatically detect multiple parts in sequence.

Description

Technical Field

[0001] The invention relates to the technical field of hole spacing measurement, in particular to a hole position detection device for automobile parts. Background Art

[0002] ‌The main purpose of hole detection for automotive parts is to ensure the performance, safety and compatibility of the parts. ‌By accurately detecting the position, size and shape of the holes, it is possible to ensure that the parts can work properly after assembly, avoiding installation problems or performance degradation caused by inaccurate hole positions. If the hole position measurement is inaccurate, the installed accessories may not perfectly match the automotive parts, resulting in loose installation, or even dangerous situations such as loosening or falling off during driving.

[0003] The hole position detection device used in the prior art for automobile parts performs manual measurement with the help of tools. This solution leads to cumbersome operation steps and requires a large amount of manual control process. Therefore, there is a large instability factor and it consumes a large amount of human resources. There is a lack of reliable and effective measurement standards. On the other hand, although the automatic completion of the aperture measurement process through vision or a variety of sensors can improve the detection efficiency, the cost of the entire detection system is high, and the probability of failure is higher than that of mechanical measurement. Subsequent maintenance, calibration and overhaul are difficult, and it is difficult to popularize. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a hole position detection device for automobile parts to solve the problems raised in the above-mentioned background technology. The present invention supports the inner wall of the hole of the part to be measured by a guide rod and a measuring rod at the same time, and the diameter measurement can be completed in cooperation with the measuring mechanism at the end. Therefore, the proportional expansion can be achieved by extending the measuring area, thereby improving the accuracy of measurement reading. The whole process does not require manual clamping operation, which is more efficient and does not require the installation of additional sensors, thereby improving the stability of the detection process, and can efficiently and automatically detect multiple parts in sequence, thereby improving the efficiency of large-scale detection.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical scheme: a hole position detection device for automobile parts, comprising a detection device body, the detection device body comprising a driving mechanism, a flip assembly, a guide assembly and a measuring mechanism, a motor is screwed at the bottom of the driving mechanism, a bottom plate is screwed at the bottom of the motor housing, a lower baffle is integrally formed at the middle of the surface of the bottom plate, an upper baffle is welded on the top of the lower baffle, a support plate is integrally formed at the top edge of the upper baffle, a pushing assembly is screwed on the surface of the support plate, a flip assembly is inserted at the end of the driving mechanism, a measuring mechanism is also welded on the surface of the bottom plate, a measuring rod is inserted inside the measuring mechanism, the measuring rod passes through the middle position of the upper baffle and the lower baffle, and one end of the measuring rod is movably connected to the guide assembly, a support arm is installed at the top of the driving mechanism, the support arm is used to intersperse and support multiple parts to be tested, and the end of the flip assembly fits with the end of the guide assembly after horizontal rotation.

[0006] Furthermore, the driving mechanism includes a motor and a support arm, a driving shaft is inserted into the output end of the motor, a rotating sleeve is welded to the surface of the driving shaft, a support arm is welded to the side of the rotating sleeve, a splint is integrally formed at the end of the support arm, and a center column is welded to the inner side of the splint.

[0007] Furthermore, the support arm is kept vertically to the driving shaft, and the two ends of the central column are fixedly connected to the center points of the inner walls of the two clamps respectively, and the end of each clamp is a semicircular structure.

[0008] Furthermore, the flip assembly includes a rotating rod and a center sleeve, the center sleeve and the rotating rod are integrally formed, a limit stop rod is welded to the side of the rotating rod, and an inclined plate is provided at the end of the rotating rod.

[0009] Furthermore, the flip assembly is sleeved on the surface of the central column through a central sleeve, the two ends of the rotating sleeve are respectively pressed against the inner sides of the two clamping plates, and the end side edge of the limit stop rod is used to press against the surface of the support arm.

[0010] Furthermore, the pushing assembly includes an electric telescopic rod and a vacuum pump, the vacuum pump is placed on the surface of the support plate, a telescopic sleeve is welded on one side of the upper baffle, one end of the electric telescopic rod is screwed to the inside of the telescopic sleeve, and one end of the vacuum pump is connected to an exhaust pipe.

[0011] Furthermore, a suction cup is inserted at the other end of the electric telescopic rod, and the ends of the exhaust pipe are respectively connected to the inside of the two suction cups. There are two electric telescopic rods, and both electric telescopic rods cooperate with the suction cups to lean against the surface of the component to be tested.

[0012] Furthermore, the guide assembly includes a docking rod, a guide rod and a rotating shaft, the guide rod is welded to the rear end of the docking rod, an extension column is integrally formed at the bottom of the docking rod, a rotating shaft is inserted into the inner side of the extension column, one end of the measuring rod is welded and installed on the surface of the rotating shaft, and a fixing plate is integrally formed at the rear end of the guide rod, and the fixing plate is welded to the surface of the upper baffle.

[0013] Furthermore, a gap is provided between the lower baffle and the upper baffle, a spring rod is inserted at the top of the lower baffle, a supporting roller is sleeved on the top of the spring rod, the measuring mechanism includes a vertical plate and a measuring rod, and the supporting roller is pressed on the top of the measuring rod.

[0014] Furthermore, a lifting groove is opened on the inner side of the vertical plate, scale lines are printed on the side of the vertical plate, the measuring rod passes through the inside of the lifting groove, and a magnetic sheet is mounted on the surface of the vertical plate, a pointer is mounted on the side of the magnetic sheet, the pointer is used to fit on the surface of the scale lines, the measuring rod passes through the middle position of the magnetic sheet, and one side of the magnetic sheet is embedded in the inside of the lifting groove, and the bottom of the vertical plate is welded to the base plate.

[0015] Beneficial effects of the present invention:

[0016] 1. The hole position detection device for automobile parts supports the inner wall of the hole of the part to be tested by the guide rod and the measuring rod at the same time, and can complete the diameter measurement with the help of the measuring mechanism at the end. Therefore, the extension effect of the measuring rod can be used to extend the measuring area toward the rear end, and finally the aperture is proportionally enlarged before reading the data, thereby improving the accuracy of measurement reading.

[0017] 2. The entire process of the automobile parts hole detection device only relies on the pushing component to adsorb and push each part to be tested in turn, and the measuring rod can be automatically squeezed and measured with the help of the part hole. The whole process does not require manual clamping operation, which is more efficient. At the same time, there is no need to install additional sensors. It only needs to expand the accuracy through the mechanical structure and then read it, which improves the stability of the detection process and reduces the pressure of later calibration and maintenance.

[0018] 3. The automobile parts hole detection device directly places multiple parts to be tested through the driving mechanism, and can efficiently and automatically detect multiple parts in sequence with the push component, thereby improving the efficiency of large-scale detection. After each part is detected, it is directly taken out from the flip component position in the middle, which will not block the subsequent parts piled up on the driving mechanism, so the entire detection process is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the appearance of a hole position detection device for automobile parts of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the driving mechanism part of the present invention;

[0021] Figure 3 The figure is a disassembled diagram of the flip assembly part of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the guide component part of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the baffle part of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the measuring mechanism part of the present invention;

[0025] Figure 7 It is a structural schematic diagram of the push component part of the present invention;

[0026] Figure 8 for Figure 1 A magnified image of area A;

[0027] In the figure: 1. bottom plate; 2. upper baffle; 3. lower baffle; 4. driving mechanism; 5. flip assembly; 6. guide assembly; 7. measuring mechanism; 8. pushing assembly; 9. motor; 10. driving shaft; 11. rotating sleeve; 12. supporting arm; 13. clamping plate; 14. center column; 15. rotating rod; 16. limit stop rod; 17. center sleeve; 18. inclined plate; 19. docking rod; 20. guide rod; 21. fixing plate; 22. extension column; 23. rotating shaft; 24. measuring rod; 25. spring rod; 26. supporting roller; 27. supporting plate; 28. telescopic sleeve; 29. ​​vertical plate; 30. lifting slot; 31. scale line; 32. magnetic suction sheet; 33. pointer; 34. vacuum pump; 35. electric telescopic rod; 36. exhaust pipe; 37. suction cup. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0029] See also Figures 1 to 8The present invention provides the following technical solutions: a hole position detection device for automobile parts, comprising a detection device body, the detection device body comprising a driving mechanism 4, a flip assembly 5, a guide assembly 6 and a measuring mechanism 7, the bottom of the driving mechanism 4 is screwed with a motor 9, the bottom of the housing of the motor 9 is screwed with a bottom plate 1, the middle of the surface of the bottom plate 1 is integrally formed with a lower baffle 3, the top of the lower baffle 3 is welded with an upper baffle 2, the top edge of the upper baffle 2 is integrally formed with a support plate 27, the surface of the support plate 27 is screwed with a push The driving mechanism 4 has a turning assembly 5 inserted at the end thereof, and a measuring mechanism 7 is welded on the surface of the bottom plate 1. A measuring rod 24 is inserted into the measuring mechanism 7. The measuring rod 24 passes through the middle position of the upper baffle 2 and the lower baffle 3, and one end of the measuring rod 24 is movably connected to the guide assembly 6. A support arm 12 is installed at the top of the driving mechanism 4. The support arm 12 is used to insert and support multiple parts to be measured. The end of the turning assembly 5 fits with the end of the guide assembly 6 after horizontal rotation. The hole position detection device for automobile parts is used to measure medium and large holes and perform automated batch measurement.

[0030] When the present invention is used, the driving mechanism 4 is first started, and the supporting arm 12 and the flip assembly 5 at the end are driven by the driving mechanism 4 to stagger with the guide assembly 6. After staggering, multiple parts to be tested can be sleeved on the supporting arm 12 by manual or external mechanical arms, and then the driving mechanism 4 can be controlled to reset. After the loading of multiple parts to be tested is completed, the pushing assembly 8 can be started, and the outermost parts to be tested are pulled toward the position of the guide assembly 6 in sequence by means of the pushing assembly 8, and finally abut against the surfaces of the upper baffle 2 and the lower baffle 3. At this time, the hole of the part to be tested is supported by the guide rod 20 and the measuring rod 24, and the diameter data can be directly read by the measuring rod 24 in cooperation with the end measuring mechanism 7, and finally the hole diameter parameter of the part to be tested is obtained. After the detection is completed, the part to be tested is still pushed to the position of the flip assembly 5 by the pushing assembly 8, and the part to be tested is directly extracted from the flip assembly 5 position by manual or mechanical arms, and the above process is repeated until the detection process of all parts to be tested is completed.

[0031] In this embodiment, the driving mechanism 4 includes a motor 9 and a support arm 12, a driving shaft 10 is inserted into the output end of the motor 9, a rotating sleeve 11 is welded on the surface of the driving shaft 10, a supporting arm 12 is welded on the side of the rotating sleeve 11, a clamping plate 13 is integrally formed at the end of the supporting arm 12, and a central column 14 is welded on the inner side of the clamping plate 13. The supporting arm 12 is kept vertical to the driving shaft 10, and the two ends of the central column 14 are respectively fixedly connected to the center points of the inner walls of the two clamping plates 13, and the ends of each clamping plate 13 are semicircular structures. Specifically, after starting the motor 9, the motor 9 drives the drive shaft 10 to rotate, and the drive shaft 10 drives the support arm 12 and the flip assembly 5 at the end of the support arm 12 to move horizontally through the rotating sleeve 11 at the top, so as to control whether the inclined plate 18 of the flip assembly 5 is docked with the guide assembly 6. Therefore, when the flip assembly 5 and the guide assembly 6 are separated, multiple external parts to be tested can be placed on the flip assembly 5 through the holes and transferred to the surface of the support arm 12 for stacking. When the flip assembly 5 and the guide assembly 6 are docked, the pushing assembly 8 can be used to pull the outermost parts to be tested along the support arm 12, the flip assembly 5 and the guide assembly 6 to the detection area in sequence for subsequent detection process.

[0032] In this embodiment, the flip assembly 5 includes a rotating rod 15 and a center sleeve 17. The center sleeve 17 and the rotating rod 15 are integrally formed. A limit stopper rod 16 is welded to the side of the rotating rod 15, and an inclined plate 18 is provided at the end of the rotating rod 15. The flip assembly 5 is sleeved on the surface of the center column 14 through the center sleeve 17. The two ends of the rotating sleeve 11 respectively abut against the inner sides of the two clamping plates 13, and the end side of the limit stopper rod 16 is used to abut against the surface of the support arm 12. Multiple parts to be tested are directly placed through the driving mechanism 4, and the pushing assembly 8 can be used to efficiently and automatically test multiple parts in sequence, thereby improving the efficiency of large-scale testing. After each part is tested, it is directly taken out from the middle flip assembly 5 position, which will not block the subsequent parts piled on the driving mechanism 4, so the entire testing process is more efficient.

[0033] Specifically, the flip assembly 5 is used to directly move the component to be tested after the hole detection has been completed, so that the subsequent components to be tested can continue to be transferred and measured. When in use, the component to be tested after the measurement is completed is pushed to the rotating rod 15 area of ​​the flip assembly 5 by the pushing assembly 8. At this time, the component to be tested can be directly pulled manually, which can drive the rotating rod 15 to rotate around the center rod by relying on the center sleeve 17 at the rear end until the inclined plate 18 of the rotating rod 15 is separated from the docking rod 19. At this time, the component to be tested can be directly pulled out, and when the next component to be tested is pulled forward for measurement by the pushing assembly 8, the rotating rod 15 can be automatically pulled for reset processing when the subsequent component to be tested passes through the rotating rod 15, and the support arm 12, the rotating rod 15 and the docking rod 19 can be in the same straight line again with the help of the limit stop rod 16 and the surface fit of the support arm 12.

[0034] In this embodiment, the push assembly 8 includes an electric telescopic rod 35 and a vacuum pump 34. The vacuum pump 34 is placed on the surface of the support plate 27. A telescopic sleeve 28 is welded on one side of the upper baffle 2. One end of the electric telescopic rod 35 is screwed into the inside of the telescopic sleeve 28. One end of the vacuum pump 34 is plugged with an exhaust pipe 36. A suction cup 37 is inserted at the other end of the electric telescopic rod 35. The ends of the exhaust pipe 36 are respectively connected to the inside of two suction cups 37. There are two electric telescopic rods 35, and both electric telescopic rods 35 are supported on the surface of the part to be measured with the help of the suction cup 37. The entire measurement process only requires the push assembly 8 to suck and push each part to be measured in turn, and the measuring rod 24 can be automatically squeezed and measured with the help of the part hole. The entire process does not require manual clamping operation, which is more efficient. At the same time, it does not require the installation of additional sensors. It only needs to be read after the accuracy is expanded by the mechanical structure, which improves the stability of the detection process and reduces the pressure of later calibration and maintenance.

[0035] Specifically, the electric telescopic rod 35 is controlled to extend, and the suction cup 37 at the end is adsorbed on the outermost surface of the component to be tested. At this time, the vacuum pump 34 is started, and the suction cup 37 is adsorbed on the surface of the component to be tested in conjunction with the exhaust pipe 36. Then, the electric telescopic rod 35 is controlled to contract to pull the component to be tested to move, and finally moved to fit with the baffle part. At this time, the holes to be tested on the component to be tested can be used to simultaneously sleeve on the guide rod 20 and the measuring rod 24 to achieve squeezing of the measuring rod 24, thereby completing the reading of data in the measuring mechanism 7 at the rear.

[0036] In this embodiment, the guide assembly 6 includes a docking rod 19, a guide rod 20 and a rotating shaft 23. The guide rod 20 is welded to the rear end of the docking rod 19. An extension column 22 is integrally formed at the bottom of the docking rod 19. The rotating shaft 23 is inserted into the inner side of the extension column 22. One end of the measuring rod 24 is welded and installed on the surface of the rotating shaft 23. A fixing plate 21 is integrally formed at the rear end of the guide rod 20. The fixing plate 21 is welded to the surface of the upper baffle 2. A gap is provided between the lower baffle 3 and the upper baffle 2. A spring rod 25 is inserted into the top of the lower baffle 3. A supporting roller 26 is sleeved on the top of the spring rod 25. The measuring mechanism 7 includes a vertical plate 29 and a measuring rod 24. The supporting roller 26 is pressed on the top of the measuring rod 24. A lifting groove 30 is provided on the inner side of the vertical plate 29, and a scale line 31 is printed on the side of the vertical plate 29. The measuring rod 24 passes through the inside of the lifting groove 30, and a magnetic sheet 32 ​​is mounted on the surface of the vertical plate 29. A pointer 33 is mounted on the side of the magnetic sheet 32. The pointer 33 is used to fit on the surface of the scale line 31. The measuring rod 24 passes through the middle position of the magnetic sheet 32, and one side of the magnetic sheet 32 ​​is embedded in the inside of the lifting groove 30. The bottom of the vertical plate 29 is welded to the bottom plate 1. The inner wall of the hole of the part to be measured is supported by the guide rod 20 and the measuring rod 24 at the same time, and the diameter measurement can be completed by cooperating with the measuring mechanism 7 at the end. Therefore, the extension effect of the measuring rod 24 can be used to extend the measuring area toward the rear end, and finally the aperture is enlarged proportionally before reading the data, thereby improving the accuracy of measurement reading.

[0037] Specifically, in the initial state, the spring rod 25 pulls the supporting roller 26 downward to apply downward pressure to the measuring rod 24. When the component to be measured moves to fit the baffle, the hole to be measured is sleeved on the guide rod 20 and the measuring rod 24, causing the measuring rod 24 to be pulled upward. At this time, the data of the scale line 31 corresponding to the point where the end of the measuring rod 24 passes through the magnetic sheet 32 ​​can be changed. Since the measuring rod 24 is extended, the pulling effect of the hole to be measured of the component to be measured on the measuring rod 24 from the baffle can be expanded by means of the extension, and the expansion interval can be expanded, thereby improving the accuracy of data reading by means of the expansion effect. Regardless of the angle to which the measuring rod 24 is rotated, since the magnetic sheet 32 ​​is always adsorbed on the surface of the column, it can be ensured that the data read by the pointer 33 are all hole data of the component to be measured.

[0038] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A hole position detection device for automobile parts, comprising a detection device body, characterized in that: The detection device body comprises a driving mechanism (4), a flip assembly (5), a guide assembly (6) and a measuring mechanism (7); a motor (9) is screwed to the bottom of the driving mechanism (4); a bottom plate (1) is screwed to the bottom of the housing of the motor (9); a lower baffle (3) is integrally formed in the middle of the surface of the bottom plate (1); an upper baffle (2) is welded to the top of the lower baffle (3); a support plate (27) is integrally formed at the top edge of the upper baffle (2); a pushing assembly (8) is screwed to the surface of the support plate (27); and a flip assembly (5) is plugged into the end of the driving mechanism (4). A measuring mechanism (7) is welded to the surface of the bottom plate (1), a measuring rod (24) is inserted into the interior of the measuring mechanism (7), the measuring rod (24) passes through the middle position of the upper baffle plate (2) and the lower baffle plate (3), and one end of the measuring rod (24) is movably connected to the guide assembly (6), a support arm (12) is installed at the top end of the driving mechanism (4), the support arm (12) is used to insert and support a plurality of components to be measured, the end of the flip assembly (5) is fitted with the end of the guide assembly (6) after horizontal rotation, and the driving mechanism (4) comprises a motor (9) and a support arm (12). The output end of the motor (9) is plugged with a drive shaft (10), a rotating sleeve (11) is welded to the surface of the drive shaft (10), a support arm (12) is welded to the side of the rotating sleeve (11), a clamping plate (13) is integrally formed at the end of the support arm (12), a center column (14) is welded to the inner side of the clamping plate (13), the flip assembly (5) comprises a rotating rod (15) and a center sleeve (17), the center sleeve (17) and the rotating rod (15) are integrally formed, a limit stopper (16) is welded to the side of the rotating rod (15), and the rotating rod (15) is integrally formed with the center sleeve (17). An inclined plate (18) is provided at the end of the moving rod (15); the guide assembly (6) comprises a docking rod (19), a guide rod (20) and a rotating shaft (23); the guide rod (20) is welded to the rear end of the docking rod (19); an extension column (22) is integrally formed at the bottom of the docking rod (19); the rotating shaft (23) is inserted into the inner side of the extension column (22); one end of the measuring rod (24) is welded to the surface of the rotating shaft (23); a fixing plate (21) is integrally formed at the rear end of the guide rod (20); and the fixing plate (21) is welded to the surface of the upper baffle (2).

2. The hole position detection device for automobile parts according to claim 1, characterized in that: The support arm (12) and the drive shaft (10) are kept in a vertical state, and the two ends of the central column (14) are respectively fixedly connected to the center points of the inner walls of the two clamping plates (13), and the end of each clamping plate (13) is a semicircular structure.

3. The hole position detection device for automobile parts according to claim 1, characterized in that: The flip assembly (5) is sleeved on the surface of the central column (14) via a central sleeve (17), the two ends of the rotating sleeve (11) respectively abut against the inner sides of the two clamping plates (13), and the end side edge of the limit stop rod (16) is used to abut against the surface of the support arm (12).

4. The hole position detection device for automobile parts according to claim 1, characterized in that: The pushing assembly (8) comprises an electric telescopic rod (35) and a vacuum pump (34); the vacuum pump (34) is placed on the surface of the support plate (27); a telescopic sleeve (28) is welded to one side of the upper baffle (2); one end of the electric telescopic rod (35) is screwed to the inside of the telescopic sleeve (28); and one end of the vacuum pump (34) is plugged with an exhaust pipe (36).

5. The hole position detection device for automobile parts according to claim 4, characterized in that: The other end of the electric telescopic rod (35) is inserted with a suction cup (37), and the ends of the air extraction pipe (36) are respectively connected to the insides of the two suction cups (37). There are two electric telescopic rods (35), and both electric telescopic rods (35) cooperate with the suction cups (37) to lean against the surface of the component to be tested.

6. The hole position detection device for automobile parts according to claim 1, characterized in that: A gap is provided between the lower baffle plate (3) and the upper baffle plate (2); a spring rod (25) is inserted into the top of the lower baffle plate (3); a supporting roller (26) is sleeved on the top of the spring rod (25); the measuring mechanism (7) comprises a vertical plate (29) and a measuring rod (24); the supporting roller (26) is pressed against the top of the measuring rod (24).

7. The hole position detection device for automobile parts according to claim 6, characterized in that: A lifting groove (30) is provided on the inner side of the vertical plate (29), and scale lines (31) are printed on the side of the vertical plate (29). The measuring rod (24) passes through the inside of the lifting groove (30), and a magnetic sheet (32) is mounted on the surface of the vertical plate (29). A pointer (33) is mounted on the side of the magnetic sheet (32), and the pointer (33) is used to fit on the surface of the scale lines (31). The measuring rod (24) passes through the middle position of the magnetic sheet (32), and one side of the magnetic sheet (32) is embedded in the inside of the lifting groove (30). The bottom of the vertical plate (29) is welded to the bottom plate (1).

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