A network transformer wire package withstand voltage test device

Abstract

The present invention relates to a network transformer wire package withstand voltage test device, comprising a base, a horizontal plate fixed on the base and a vertical plate fixed on one side of the horizontal plate, a gap is reserved between the horizontal plate and the base, a deep groove is provided on the horizontal plate to form a placement area for placing the wire package to be tested, two groups of telescopic clamping mechanisms are movably provided in the placement area, and the two groups of telescopic clamping mechanisms are connected to a deflection driving mechanism installed on the base, the deflection driving mechanism is located in the gap, and is also connected to a pneumatic pressing member installed on the vertical plate through a transmission mechanism, the pneumatic pressing member comprises a cylinder installed on the vertical plate and a pressure plate fixed on the movable end of the cylinder, finally, in actual detection, the pressing action and the detection can be triggered synchronously without manual pressing, thereby effectively improving the detection efficiency, and the device is suitable for large-scale industrial production.

Description

Technical Field

[0001] The invention relates to the technical field related to network transformers, and in particular to a network transformer wire package withstand voltage testing device. Background Art

[0002] The network transformer is composed of a body and a wire package, and the wire package is composed of enameled wire, T1 magnetic ring, and T2 magnetic ring. "When the network transformer is connected, it is mainly used for signal level coupling. First, it can enhance the signal and make it transmit farther; second, it isolates the chip end from the outside, greatly enhances the anti-interference ability, and adds a great protection to the chip (such as lightning strike); third, when connected to network ports of different levels (such as some PHY chips are 2.5V, and some PHY chips are 3.3V), it will not affect each other's devices.

[0003] At present, the withstand voltage test of the wire package is to place the wire package on an insulating pad, and then use two copper sheets to press the enameled wire and the magnetic ring respectively, and then use the detection device to test. Since this method uses manual pressing, it may cause the enameled wire to leak during the test, affecting the test results. Summary of the invention

[0004] The object of the present invention is to provide a network transformer coil withstand voltage test device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A network transformer wire package withstand voltage test device, comprising a base, a horizontal plate fixed on the base, and a vertical plate fixed on one side of the horizontal plate, wherein the cross section of the vertical plate is arranged in an "L" shape, and a gap is reserved between the horizontal plate and the base;

[0007] The horizontal plate is provided with a deep groove to form a placement area for placing the wire package to be tested, and two sets of telescopic clamping mechanisms are movably provided in the placement area, and the two sets of telescopic clamping mechanisms are connected to the deflection driving mechanism installed on the base;

[0008] The deflection drive mechanism is located in the gap and is also connected to a pneumatic pressing member installed on the vertical plate through a transmission mechanism, wherein the pneumatic pressing member includes a cylinder installed on the vertical plate and a pressure plate fixed to a movable end of the cylinder;

[0009] The network transformer coil withstand voltage test device also includes two detection plates arranged on the horizontal plate and respectively located on both sides of the deep groove. The detection plates are connected to the detection box arranged on the horizontal plate. The horizontal plate is also provided with a control switch for controlling the opening and closing state of the detection box. The horizontal plate is also provided with two groups of elastic clamping mechanisms respectively located above the two detection plates, and the elastic clamping mechanisms are connected to the deflection drive mechanism.

[0010] As a further solution of the present invention: the deflection drive mechanism includes a double-sided cam rotatably mounted on the base and two follower rods movably arranged at the bottom of the horizontal plate, the two follower rods are each connected to the double-sided cam through a set of sliding fitting structures, and two guide columns passing through the horizontal plate are fixed on the follower rods, the guide columns are connected to the telescopic clamping mechanism, and the horizontal plate is provided with a through groove for the guide columns to move.

[0011] As a further solution of the present invention: the two follower rods are staggered with each other, and the sliding matching structure includes a strip slide groove opened on the side of the follower rod away from the guide column and a driving column fixed on the double-sided cam, and the driving column extends into the strip slide groove and is slidably connected with the follower rod.

[0012] As a further solution of the present invention: the telescopic clamping mechanism includes a movable plate fixed at one end of the guide column away from the driven rod and hollow inside, a telescopic plate slidably fitted with the movable plate, and a clamping member fixed at one end of the telescopic plate, the clamping member is arranged in an arc shape, and an elastic force-applying component is provided between the movable plate and the telescopic plate.

[0013] As a further solution of the present invention: the elastic force-applying component includes two guide rods fixed to the movable plate by two protrusions, a slider slidably arranged on the two guide rods and fixed to the telescopic plate, and a first cylindrical spring sleeved on the outer periphery of the guide rods, the two ends of the first cylindrical spring are respectively connected to the slider and the protrusions, and a square groove for the movement of the slider is opened on the movable plate.

[0014] As a further solution of the present invention: the transmission mechanism includes a rack plate located on the side of the vertical plate and fixed to the movable end of the cylinder through a connecting plate, a transmission shaft rotatably mounted on the base, and a gear fixedly mounted on one end of the transmission shaft and meshing with the rack plate, and the other end of the transmission shaft is connected to the rotating shaft of the double-sided cam through a bevel gear set and a transmission belt.

[0015] As a further solution of the present invention: a lifting plate is slidably arranged on the horizontal plate, the lifting plate is arranged in an "L" shape, and is connected to the driven rod through a sliding limit structure, and the elastic clamping mechanism includes two round tubes fixed on the lifting plate, a telescopic rod slidably arranged in the round tube, and a pressing plate fixed on one end of the two telescopic rods away from the lifting plate;

[0016] Among them, a second cylindrical spring is also provided in the circular tube, one end of the second cylindrical spring is connected to the lifting plate, and the other end is connected to the end of the telescopic rod away from the pressure plate. A trigger rod cooperating with the control switch is also provided on the lifting plate.

[0017] As a further solution of the present invention: the sliding limiting structure includes a limiting rod fixed to the driven rod through a connecting rod and a driven column fixedly installed on the lifting plate, the limiting rod is provided with an inclined through groove, and the driven column passes through the inclined through groove and is slidably connected to the limiting rod.

[0018] Compared with the prior art, the beneficial effects of the present invention are: the present invention is novel in design. When performing detection work, the wire package to be tested is placed in the deep groove on the horizontal plate. Then, the cylinder drives the pressure plate to descend, so that the pressure plate performs a clamping action on the magnetic ring. At the same time, the transmission mechanism is triggered and drives the deflection drive mechanism to move, so that the telescopic clamping mechanism and the elastic clamping mechanism respectively clamp the wire package body and the tail wire on the detection plate. At the same time, with the movement of one set of elastic clamping mechanisms, the control switch is turned on to put the detection box in a working state. In this way, in actual detection, the pressing action and detection can be triggered synchronously without manual pressing, thereby effectively improving the detection efficiency. The device is suitable for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a structural schematic diagram of an embodiment of a network transformer wire package withstand voltage test device.

[0020] Figure 2 This is a structural schematic diagram from another angle of an embodiment of a network transformer coil withstand voltage test device.

[0021] Figure 3 The present invention is a structural schematic diagram from another angle of an embodiment of a network transformer winding withstand voltage testing device.

[0022] Figure 4 for Figure 2 A magnified view of the structure at center.

[0023] Figure 5 for Figure 3 A magnified view of the structure at point B.

[0024] Figure 6 The figure is a schematic diagram of the connection relationship between the transmission mechanism and the deflection drive mechanism in one embodiment of a network transformer coil withstand voltage test device.

[0025] Figure 7 This is a structural explosion diagram of the elastic clamping mechanism in one embodiment of a network transformer wire package withstand voltage test device.

[0026] In the figure: 1. base; 2. horizontal plate; 3. vertical plate; 4. detection box; 5. control switch; 6. cylinder; 7. pressure plate; 8. clamping member; 9. moving plate; 10. telescopic plate; 11. first cylindrical spring; 12. raised part; 13. guide rod; 14. slider; 15. guide column; 16. driven rod; 17. double-sided cam; 18. driving column; 19. transmission belt; 20. bevel gear set; 21. transmission shaft; 22. gear; 23. rack plate; 24. connecting plate; 25. detection plate; 26. pressure plate; 27. lifting plate; 28. second cylindrical spring; 29. ​​round tube; 30. telescopic rod; 31. connecting rod; 32. limit rod; 33. driven column; 34. trigger rod. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0029] See also Figure 1-7 In an embodiment of the present invention, a network transformer coil withstand voltage test device includes a base 1, a horizontal plate 2 fixed on the base 1, and a vertical plate 3 fixed on one side of the horizontal plate 2. The cross section of the vertical plate 3 is set in an "L" shape, and a gap is reserved between the horizontal plate 2 and the base 1. The horizontal plate 2 is provided with a deep groove to form a placement area for the coil to be tested. Two sets of telescopic clamping mechanisms are movably provided in the placement area, and the two sets of telescopic clamping mechanisms are connected to the deflection drive mechanism installed on the base 1;

[0030] The deflection driving mechanism is located in the gap and is also connected to a pneumatic pressing member installed on the vertical plate 3 through a transmission mechanism. The pneumatic pressing member includes a cylinder 6 installed on the vertical plate 3 and a pressure plate 7 fixed to the movable end of the cylinder 6.

[0031] The network transformer wire package withstand voltage test device also includes two detection plates 25 arranged on the horizontal plate 2 and respectively located on both sides of the deep groove. The detection plates 25 are connected to the detection box 4 arranged on the horizontal plate 2. The horizontal plate 2 is also provided with a control switch 5 for controlling the opening and closing state of the detection box 4. The horizontal plate 2 is also provided with two groups of elastic clamping mechanisms respectively located above the two detection plates 25, and the elastic clamping mechanisms are connected to the deflection drive mechanism.

[0032] In actual use, the cylinder 6 can also be replaced by an electric telescopic rod or a hydraulic cylinder. This application does not make any specific limitations on this and can be selected according to actual needs. It only needs to meet the driving requirements. During testing, the telescopic stroke of the cylinder 6 is set in advance, and its operation can be controlled by single-chip microcomputer programming to achieve production automation.

[0033] Among them, it should be supplemented that the detection plate 25 is made of bakelite with a copper sheet on the top. When performing the detection work, the wire package to be tested is placed in the deep groove on the horizontal plate 2. Then, the cylinder 6 drives the pressure plate 7 to descend, so that the pressure plate 7 performs the clamping action on the magnetic ring. At the same time, the transmission mechanism is triggered and drives the deflection drive mechanism to move, so that the telescopic clamping mechanism and the elastic clamping mechanism respectively clamp the wire package body and the tail wire located on the detection plate 25. At the same time, with the movement of one set of elastic clamping mechanisms, the control switch 5 is turned on to put the detection box 4 in a working state. In this way, in actual detection, the pressing action and detection can be triggered synchronously without manual pressing, thereby effectively improving the detection efficiency. The device is suitable for large-scale industrial production.

[0034] Please refer again Figure 5 and Figure 6 The deflection driving mechanism includes a double-sided cam 17 rotatably mounted on the base 1 and two follower rods 16 movably arranged at the bottom of the horizontal plate 2. The two follower rods 16 are connected to the double-sided cam 17 through a set of sliding matching structures, and two guide columns 15 passing through the horizontal plate 2 are fixed on the follower rods 16. The guide columns 15 are connected to the telescopic clamping mechanism, and a through groove for the guide columns 15 to move is opened on the horizontal plate 2.

[0035] The two follower rods 16 are staggered with each other, and the sliding matching structure includes a strip groove opened on the side of the follower rod 16 away from the guide column 15 and a driving column 18 fixed on the double-sided cam 17, and the driving column 18 extends into the strip groove and is slidably connected with the follower rod 16.

[0036] When the cylinder 6 drives the pressure plate 7 to descend, the transmission mechanism is triggered and drives the double-sided cam 17 to deflect. Then, under the guiding action of the guide column 15, the driving column 18 slides with the driven rod 16 through the strip groove on the driven rod 16, so that the two driven rods 16 slide close to each other. Then, the two driven rods 16 can drive the two sets of telescopic clamping mechanisms to move through the guide column 15 to clamp and limit the wire package, thereby ensuring stability in the subsequent test process and ensuring the accuracy of the test results.

[0037] Please refer again Figure 4 and Figure 6 The telescopic clamping mechanism includes a movable plate 9 which is fixed at one end of the guide column 15 away from the driven rod 16 and is hollow inside, a telescopic plate 10 which is slidably fitted with the movable plate 9, and a clamping member 8 fixed at one end of the telescopic plate 10. The clamping member 8 is arranged in an arc shape, and an elastic force-applying component is provided between the movable plate 9 and the telescopic plate 10.

[0038] The elastic force-applying component includes two guide rods 13 fixed to the movable plate 9 via two protrusions 12, a slider 14 slidably disposed on the two guide rods 13 and fixed to the telescopic plate 10, and a first cylindrical spring 11 sleeved on the outer periphery of the guide rods 13, wherein the two ends of the first cylindrical spring 11 are respectively connected to the slider 14 and the protrusion 12, and a square groove for the slider 14 to move is provided on the movable plate 9.

[0039] In the process of the transmission mechanism driving the double-sided cam 17 to deflect, the two follower rods 16 drive the two movable plates 9 to slide close to each other through the guide column 15. Correspondingly, the two clamping members 8 move close to each other. After the clamping members 8 come into contact with the wire package, as the two movable plates 9 continue to move, the telescopic plate 10 will gradually slide into the movable plate 9, and the slider 14 slides on the two guide rods 13 toward the protrusion 12, so that the first cylindrical spring 11 is compressed and a certain amount of elastic potential energy is stored. In this way, the wire package body can be effectively stabilized, which is convenient for the smooth progress of subsequent detection.

[0040] Please refer again Figure 2 , Figure 5 as well as Figure 6The transmission mechanism includes a rack plate 23 located on the side of the vertical plate 3 and fixed to the movable end of the cylinder 6 through a connecting plate 24, a transmission shaft 21 rotatably mounted on the base 1, and a gear 22 fixedly mounted at one end of the transmission shaft 21 and meshing with the rack plate 23. The other end of the transmission shaft 21 is connected to the rotating shaft of the double-sided cam 17 through a bevel gear set 20 and a transmission belt 19.

[0041] Specifically, the bevel gear set 20 includes a first bevel gear fixedly mounted on the end of the transmission shaft 21 away from the gear 22 and a second bevel gear rotatably mounted on the base 1, the second bevel gear is meshed with the first bevel gear, and the transmission belt 19 is used to connect the rotating shafts of the second bevel gear and the double-sided cam 17.

[0042] When the cylinder 6 drives the pressure plate 7 to descend, it will also drive the rack plate 23 to move downward through the connecting plate 24. Then, the rack plate 23 cooperates with the gear 22 to rotate the gear 22. Then, the gear 22 drives the double-sided cam 17 to rotate through the transmission shaft 21, the bevel gear set 20 and the transmission belt 19, so that the clamping member 8 performs the clamping and limiting action on the line package, and at the same time, the elastic clamping mechanism performs the clamping action on the tail line.

[0043] Please refer again Figure 7 A lifting plate 27 is slidably provided on the horizontal plate 2, the lifting plate 27 is provided in an "L" shape, and is connected to the driven rod 16 through a sliding limit structure, and the elastic clamping mechanism includes two round tubes 29 fixed on the lifting plate 27, a telescopic rod 30 slidably provided in the round tube 29, and a pressing plate 26 fixed to one end of the two telescopic rods 30 away from the lifting plate 27;

[0044] Among them, a second cylindrical spring 28 is also provided in the circular tube 29, one end of the second cylindrical spring 28 is connected to the lifting plate 27, and the other end is connected to the end of the telescopic rod 30 away from the pressing plate 26. The lifting plate 27 is also provided with a trigger rod 34 that cooperates with the control switch 5.

[0045] The sliding limiting structure includes a limiting rod 32 fixed to the driven rod 16 through a connecting rod 31 and a driven column 33 fixedly mounted on the lifting plate 27. The limiting rod 32 is provided with an inclined through groove, and the driven column 33 passes through the inclined through groove and is slidably connected to the limiting rod 32.

[0046] When the driven rod 16 moves due to the deflection of the double-sided cam 17, the limit rod 32 will move with the driven rod 16 through the connecting rod 31 and slide with the driven column 33. Then, the limit rod 32 drives the lifting plate 27 to gradually slide down on the cross plate 2 through the driven column 33, and the pressure plate 26 gradually approaches the detection plate 25. After the pressure plate 26 contacts the tail line on the detection plate 25, as the lifting plate 27 continues to slide down, the second column spring 28 is gradually compressed to provide a certain pressure for the pressure plate 26. At the same time, the trigger rod 34 will move down with the lifting plate 27. After the lifting plate 27 stops sliding down, the trigger rod 34 is just at the height for pressing the control switch 5, so that the detection box 4 switches to the detection working state.

[0047] When the network transformer coil withstand voltage test device is implemented, the coil to be tested is placed in the deep groove on the horizontal plate 2, and then the cylinder 6 drives the pressure plate 7 to descend, so that the pressure plate 7 performs the pressing action on the magnetic ring, and at the same time, the connecting plate 24 drives the rack plate 23 to move downward, so that the rack plate 23 cooperates with the gear 22, so that the gear 22 rotates, and then the gear 22 drives the double-sided cam 17 to rotate through the transmission shaft 21, the bevel gear set 20 and the transmission belt 19;

[0048] During the deflection of the double-sided cam 17, the two follower rods 16 drive the two moving plates 9 to slide close to each other through the guide column 15. Accordingly, the two clamping members 8 move close to each other. After the clamping members 8 come into contact with the wire package, as the two moving plates 9 continue to move, the telescopic plate 10 will gradually slide into the moving plate 9, and the slider 14 will slide on the two guide rods 13 toward the protrusion 12, so that the first cylindrical spring 11 is compressed and a certain amount of elastic potential energy is stored. In this way, the wire package body can be effectively stabilized, which is convenient for the smooth progress of subsequent detection.

[0049] When the driven rod 16 moves due to the deflection of the double-sided cam 17, the limiting rod 32 will move with the driven rod 16 through the connecting rod 31 and slide with the driven column 33. Therefore, the limiting rod 32 drives the lifting plate 27 to gradually slide down on the cross plate 2 through the driven column 33, and the pressure plate 26 gradually approaches the detection plate 25. After the pressure plate 26 contacts the tail line on the detection plate 25, as the lifting plate 27 continues to slide down, the second column spring 28 is gradually compressed to provide a certain pressure for the pressure plate 26. At the same time, the trigger rod 34 will move down with the lifting plate 27. After the lifting plate 27 stops sliding down, the trigger rod 34 is just at the height of pressing the control switch 5, so that the detection box 4 switches to the detection working state;

[0050] In summary, in actual detection, the pressing action and the detection can be triggered synchronously without manual pressing, thereby effectively improving the detection efficiency. The device is suitable for large-scale industrial production.

[0051] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0052] 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 network transformer coil withstand voltage test device, characterized in that: It comprises a base (1), a horizontal plate (2) fixed on the base (1), and a vertical plate (3) fixed on one side of the horizontal plate (2), wherein the cross section of the vertical plate (3) is arranged in an "L" shape, and a gap is reserved between the horizontal plate (2) and the base (1); The horizontal plate (2) is provided with a deep groove to form a placement area for placing the wire package to be tested, and two sets of telescopic clamping mechanisms are movably provided in the placement area, and the two sets of telescopic clamping mechanisms are connected to the deflection drive mechanism installed on the base (1); The deflection drive mechanism is located in the gap and is also connected to a pneumatic pressing member mounted on the vertical plate (3) through a transmission mechanism, wherein the pneumatic pressing member comprises a cylinder (6) mounted on the vertical plate (3) and a pressure plate (7) fixed to the movable end of the cylinder (6); The network transformer coil withstand voltage test device further comprises two detection plates (25) arranged on the horizontal plate (2) and respectively located on both sides of the deep groove, the detection plates (25) being connected to a detection box (4) arranged on the horizontal plate (2), the horizontal plate (2) being further provided with a control switch (5) for controlling the opening and closing state of the detection box (4), and the horizontal plate (2) being further provided with two groups of elastic clamping mechanisms respectively located above the two detection plates (25), the elastic clamping mechanisms being connected to the deflection drive mechanism; The deflection drive mechanism comprises a double-sided cam (17) rotatably mounted on the base (1) and two follower rods (16) movably arranged at the bottom of the horizontal plate (2), the two follower rods (16) are each connected to the double-sided cam (17) via a set of sliding matching structures, and two guide columns (15) penetrating the horizontal plate (2) are fixed to the follower rods (16), the guide columns (15) are connected to the telescopic clamping mechanism, and the horizontal plate (2) is provided with a through groove for the guide columns (15) to move; The two driven rods (16) are staggered with each other, and the sliding matching structure comprises a strip-shaped slide groove provided on a side of the driven rod (16) away from the guide column (15) and a driving column (18) fixed on the double-sided cam (17), wherein the driving column (18) extends into the strip-shaped slide groove and is slidably connected with the driven rod (16); The telescopic clamping mechanism comprises a hollow movable plate (9) fixed to one end of the guide column (15) away from the driven rod (16), a telescopic plate (10) slidably fitted with the movable plate (9), and a clamping member (8) fixed to one end of the telescopic plate (10), wherein the clamping member (8) is arranged in an arc shape, and an elastic force-applying component is provided between the movable plate (9) and the telescopic plate (10); The elastic force-applying component comprises two guide rods (13) fixed to the movable plate (9) via two protrusions (12), a slider (14) slidably arranged on the two guide rods (13) and fixed to the telescopic plate (10), and a first columnar spring (11) sleeved on the outer circumference of the guide rods (13), the two ends of the first columnar spring (11) being respectively connected to the slider (14) and the protrusion (12), and a square groove for allowing the slider (14) to move is provided on the movable plate (9).

2. A network transformer coil withstand voltage test device according to claim 1, characterized in that: The transmission mechanism comprises a rack plate (23) located on the side of the vertical plate (3) and fixed to the movable end of the cylinder (6) via a connecting plate (24), a transmission shaft (21) rotatably mounted on the base (1), and a gear (22) fixedly mounted on one end of the transmission shaft (21) and meshing with the rack plate (23); the other end of the transmission shaft (21) is connected to the rotating shaft of the double-sided cam (17) via a bevel gear set (20) and a transmission belt (19).

3. A network transformer coil withstand voltage test device according to claim 2, characterized in that: A lifting plate (27) is slidably disposed on the transverse plate (2), the lifting plate (27) being disposed in an "L" shape and connected to the driven rod (16) via a sliding limit structure, the elastic clamping mechanism comprising two round tubes (29) fixed on the lifting plate (27), telescopic rods (30) slidably disposed in the round tubes (29), and a pressing plate (26) fixed to one end of the two telescopic rods (30) away from the lifting plate (27); A second cylindrical spring (28) is further provided in the circular tube (29), one end of the second cylindrical spring (28) is connected to the lifting plate (27), and the other end is connected to an end of the telescopic rod (30) away from the pressing plate (26), and a trigger rod (34) cooperating with the control switch (5) is also provided on the lifting plate (27).

4. A network transformer coil withstand voltage test device according to claim 3, characterized in that: The sliding limit structure comprises a limit rod (32) fixed to the driven rod (16) via a connecting rod (31) and a driven column (33) fixedly mounted on the lifting plate (27); the limit rod (32) is provided with an inclined through slot, and the driven column (33) passes through the inclined through slot and is slidably connected to the limit rod (32).

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