A resistance element laser welding apparatus

Abstract

The application discloses a resistance piece laser welding device and belongs to the field of laser cutting, which comprises a base, a laser welding gun is arranged at the upper end of the base, a motor is fixedly connected to the upper end of the base, a transmission shaft is fixedly connected to the output end of the motor, a worm is fixedly arranged on the outer wall of the transmission shaft, two worms are engaged on the two sides of the worm, a rotating shaft A is fixedly connected to the outer wall of the worm wheel, and a swing rod is fixedly connected to the other end of the rotating shaft A. The transmission system of the worm, the worm wheel and the rotating shaft is arranged, the movement path of the bending plate is very stable, and the resistance piece can be accurately bent. The design of the annular frame makes the movement track of the sliding sleeve more accurate, helps to ensure the rotation stability of the bending plate, and ensures that the resistance piece is well centered before bending, thereby avoiding uneven bending or problems at the welding joint due to misalignment or deviation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laser cutting, in particular, to a resistance laser welding device. BACKGROUND

[0002] Resistance is one of the electronic components, the main function is to limit the flow of current and adjust the voltage in the circuit. They control the size of the current by providing a certain resistance value, in accordance with Ohm's law.

[0003] As disclosed in Chinese patent No. CN117139846B, the technical solution of the patent document is as follows: a resistance laser welding device, comprising: a base, a main body feeding device, a pin feeding device, a laser welding device, an auxiliary turning device and a bending device; the main body feeding device is arranged on one side of the pin feeding device, and the laser welding device is arranged between the main body feeding device and the pin feeding device. A sliding table and a mechanical arm are arranged on the pin feeding device, the sliding table drives the mechanical arm to move, and the mechanical arm is used for carrying the resistance. The auxiliary turning device and the bending device are arranged on the base, the auxiliary turning device is used for turning the resistance, and the bending device is used for bending the resistance. The resistance laser welding device with the bending function can automatically bend the resistance after laser welding, thereby reducing the burden of workers and improving the production efficiency.

[0004] The pressure holding piece and the sliding rod in the above-mentioned laser welding device are connected by magnetic force. Although this method can simplify the structure, the magnetic force may change due to external factors (such as temperature, magnetic field interference, etc.) during work, causing the pressure holding piece to not accurately contact the resistance, thereby affecting the clamping force, which may cause deviation or instability when the resistance is bent. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a resistance laser welding device, which solves the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides a resistance laser welding device, comprising a base, a laser welding gun is arranged at the upper end of the base;

[0007] The upper end of the base is fixedly connected with a motor, the output end of the motor is fixedly connected with a transmission shaft, the outer wall of the transmission shaft is fixedly sleeved with a worm, the two sides of the worm are meshed with worm gears, the outer wall of the worm gear is fixedly connected with a rotating shaft A, the other end of the rotating shaft A is fixedly connected with a swing rod, a sliding groove A is formed in the middle of the swing rod, a connecting shaft is slidably connected in the sliding groove A, a bending plate is fixedly sleeved on the outer wall of the connecting shaft, and a sliding sleeve is rotatably connected to the other end of the connecting shaft;

[0008] The upper end of the base is fixedly connected with a fixed plate, the middle part of the fixed plate is fixedly connected with a placing plate, the bending plate is hingedly connected on both sides of the placing plate, the outer wall of the fixed plate is equipped with a pushing and positioning assembly, and the upper end of the placing plate is equipped with a material removing assembly.

[0009] Preferably, the front surface of the fixed plate is fixedly connected with a ring-shaped frame, and the sliding sleeve is slidingly connected to the outer wall of the ring-shaped frame.

[0010] Preferably, the middle part of the bending plate is provided with a through groove, and the width of the through groove is greater than the diameter of the pin of the resistance element.

[0011] Preferably, the pushing and positioning assembly comprises a connecting block A fixedly connected to the outer wall of the fixed plate, a hydraulic chamber fixedly connected to the side surface of the fixed plate through the connecting block A, a hydraulic rod A and a hydraulic rod B slidingly connected to the two ports of the hydraulic chamber respectively, a ball fixedly connected to the top of the hydraulic rod A, a spring A movably sleeved to the outer wall of the hydraulic rod A, and the two ends of the spring A being fixedly connected to the ball and the hydraulic chamber respectively, a shaped pushing block fixedly connected to the other end of the hydraulic rod B, a connecting block B fixedly sleeved to the outer wall of the hydraulic rod B, a connecting rod fixedly connected to the upper end of the connecting block B, a moving block A fixedly connected to the other end of the connecting rod, an installation plate fixedly connected to the outer wall of the fixed plate, a through hole formed in the outer wall of the installation plate, a moving rod slidingly connected to the inside of the through hole, a moving block B fixedly connected to the top of the moving rod, a spring B movably sleeved to the outer wall of the moving rod, and the two ends of the spring B being fixedly connected to the moving block B and the installation plate respectively, a shaped plate fixedly connected to the moving rod, and a roller arranged on the inner side of the shaped plate.

[0012] Preferably, the side close to the moving block B of the moving block A is provided with an inclined surface.

[0013] Preferably, the upper end of the placing plate is provided with a sliding groove B, and the shaped pushing block is slidingly connected to the inside of the sliding groove B.

[0014] Preferably, the material removing assembly comprises two installation blocks, a rotating shaft B rotatably connected between the two installation blocks, an L-shaped plate fixedly sleeved to the outer wall of the rotating shaft B, a torsional spring movably sleeved to the outer wall of the rotating shaft B, and the two ends of the torsional spring being fixedly connected to the installation blocks and the L-shaped plate respectively, an activity rod fixedly connected to the bottom of the L-shaped plate, and an elastic telescopic rod fixedly connected to the outer wall of the shaped pushing block.

[0015] Preferably, the inside bottom end of the sliding groove B is provided with a groove, the bottom of the placing plate is provided with an activity slot, the activity rod is movably penetrated through the activity slot, the outer wall of the fixed plate is fixedly connected with a connecting plate, and the laser welding gun is fixedly connected to the bottom of the connecting plate.

[0016] The application has the advantages that:

[0017] (1) The transmission system of the worm, the worm gear and the rotating shaft is arranged, the movement path of the bending plate is very stable, the resistance piece can be accurately bent, the design of the annular frame makes the movement track of the sliding sleeve more accurate, the rotation stability of the bending plate is ensured, the resistance piece can be accurately centered before bending, and the problems of uneven bending and welding joints caused by misalignment or deviation are avoided.

[0018] (2) The pushing and positioning assembly adopts a hydraulic system, is equipped with hydraulic rods A and B and an L-shaped pushing block, can accurately push the resistance piece, ensures that the resistance piece is pushed to a specified position after welding, can achieve the limiting effect of the resistance piece, and then keeps a stable position, and errors caused by inaccurate positioning are avoided.

[0019] (3) The material stripping assembly is designed by the L-shaped plate and the movable rod, can realize efficient material stripping of the resistance piece. In particular, after the bending is completed, the resistance piece that has completed bending can be smoothly pushed out of the placing plate through the coordinated action of the elastic expansion rod and the torsional spring, and the resistance in the material stripping process is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments illustrated in the drawings of the application in which:

[0021] Figure 1 is a schematic diagram of the overall structure of the application;

[0022] Figure 2 is a schematic diagram of the top view structure of the application;

[0023] Figure 3 is a schematic diagram of the local three-dimensional structure of the application;

[0024] Figure 4 is a schematic diagram of the Figure 1 enlarged structure at A of the application;

[0025] Figure 5 is a schematic diagram of the Figure 3 enlarged structure at B of the application;

[0026] Figure 6 is a schematic diagram of the local sectional structure of the application;

[0027] Figure 7 is a schematic diagram of the Figure 6 enlarged structure at C of the application.

[0028] In the above figure, 1, base; 2, fixed plate; 3, laser welding gun; 41, motor; 42, transmission shaft; 43, worm; 44, worm gear; 45, rotating shaft A; 46, swing rod; 47, sliding groove A; 48, connecting shaft; 49, bending plate; 410, annular frame; 411, sliding sleeve; 412, through groove; 5, placing plate; 6, pushing and positioning assembly; 61, connecting block A; 62, hydraulic chamber; 63, hydraulic rod A; 64, ball; 65, spring A; 66, hydraulic rod B; 67, L-shaped pushing block; 68, connecting block B; 69, connecting rod; 610, moving block A; 611, mounting plate; 612, moving rod; 613, moving block B; 614, spring B; 615, roller; 616, sliding groove B; 617, L-shaped plate; 7, material removing assembly; 71, mounting block; 72, rotating shaft B; 73, L-shaped plate; 74, torsional spring; 75, groove; 76, movable rod; 77, elastic telescopic rod; 78, movable groove; 8, connecting plate. DETAILED DESCRIPTION

[0029] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative work should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so as to describe the embodiments of the present application. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0031] In the present application, the terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0032] And, the above-mentioned partial terms, in addition to can be used to express the orientation or positional relationship, possibly also be used to express other meanings, for example, the term "upper" in some cases can also be used to express a certain dependent relationship or connection relationship. For those of ordinary skill in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0033] In addition, the terms "mounting", "setting", "provided with", "connecting", "connecting", "sleeving" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0035] Embodiment 1: see Figures 1-4The utility model provides a resistance piece laser welding equipment, including base 1, the upper end of base 1 is provided with laser welding gun 3, and laser welding gun 3 is responsible for the laser welding operation of resistance piece, is usually used to carry out accurate welding work. It cooperates with the control system in the welding process, carries out heating and melts the joint part of resistance piece, welds, the upper end of base 1 is fixedly connected with motor 41, the output of motor 41 is fixedly connected with transmission shaft 42, the outer wall of transmission shaft 42 is fixedly covered with worm 43, the both sides of worm 43 are engaged with worm wheel 44, the outer wall of worm wheel 44 is fixedly connected with rotating shaft A 45, the other end of rotating shaft A 45 is fixedly connected with swing rod 46, the middle part of swing rod 46 is equipped with sliding slot A 47, the inside of sliding slot A 47 is slidably connected with connecting shaft 48, the outer wall of connecting shaft 48 is fixedly covered with bending plate 49, and the distance between the inside of bending plate 49 and the inside of the shaped plate 617 when rotating to the placing plate 5 vertical is consistent with the thickness of resistance piece, and the other end of connecting shaft 48 is rotatably connected with sliding sleeve 411, the upper end of base 1 is fixedly connected with fixed plate 2, the middle part of fixed plate 2 is fixedly connected with placing plate 5, and bending plate 49 is hinged on both sides of placing plate 5, and the outer wall of fixed plate 2 is equipped with pushing and positioning assembly 6, and the upper end of placing plate 5 is equipped with stripping assembly 7, and the action of stripping assembly 7 is to complete the discharging action after resistance piece welding and bending, the front of fixed plate 2 is fixedly connected with annular frame 410, sliding sleeve 411 is slidably connected on the outer wall of annular frame 410, and annular frame 410 provides moving track for sliding sleeve 411, to guarantee the rotation stability of bending plate 49, the middle part of bending plate 49 is equipped with through slot 412, and the width of through slot 412 is greater than the diameter of resistance piece pin, to guarantee that the pin on both sides of resistance piece passes through through slot 412 when bending plate 49 bends resistance piece, to avoid damaging pin in the process of bending.

[0036] In use, the motor 41 is started to drive the transmission shaft 42 to rotate, and the worm 43 fixedly sleeved outside the transmission shaft 42 will rotate, and the worm gear 44 engaged with the worm 43 will rotate, and the worm gear 44 will drive the two swing rods 46 on both sides through the rotating shaft A 45 to rotate inward, and the connecting shaft 48 will slide in the sliding groove A 47, and the sliding sleeve 411 will slide on the outer wall of the annular frame 410 through the connecting shaft 48, and the bending plate 49 will rotate around the hinge point of the placing plate 5. When the bending plate 49 is parallel to the placing plate 5, the pusher and positioning assembly 6 has pushed the welded resistance element to the middle of the bending plate 49 and fixed the resistance element. When the bending plate 49 continues to rotate inward with the connecting shaft 48 and the sliding sleeve 411, it will contact the side surface of the resistance element. When one side of the bending plate 49 contacts the resistance element, the upper end of the resistance element is limited by the roller 615, so the bending plate 49 pushes the resistance element to move to the other side until the two sides of the resistance element contact the bending plate 49. The bending plate 49 continues to rotate inward, and the resistance element is bent. When the bending plate 49 is perpendicular to the placing plate 5, the upper end of the resistance element contacts the two sides of the U-shaped plate 617, and the resistance element is bent into a U shape. Because the middle of the bending plate 49 is provided with a through groove 412, the pins on both sides of the resistance element are not affected when the bending plate 49 is bent.

[0037] Example 2: see Figures 1-6The pushing and positioning assembly 6 comprises a connecting block A61 fixedly connected to the outer wall of the fixed plate 2, a hydraulic bin 62 fixedly connected to the side of the fixed plate 2 through the connecting block A61, a hydraulic rod A63 and a hydraulic rod B66 respectively slidably connected to the two ports of the hydraulic bin 62, a ball 64 fixedly connected to the top of the hydraulic rod A63, a spring A65 movably sleeved on the outer wall of the hydraulic rod A63, the two ends of the spring A65 being fixedly connected to the ball 64 and the hydraulic bin 62 respectively, a shaped pushing block 67 fixedly connected to the other end of the hydraulic rod B66, a connecting block B68 fixedly sleeved on the outer wall of the hydraulic rod B66, a connecting rod 69 fixedly connected to the upper end of the connecting block B68, a moving block A610 fixedly connected to the other end of the connecting rod 69, an installation plate 611 fixedly connected to the outer wall of the fixed plate 2, a through hole being formed in the outer wall of the installation plate 611, a moving rod 612 slidably connected to the inside of the through hole, a moving block B613 fixedly connected to the top of the moving rod 612, a spring B614 movably sleeved on the outer wall of the moving rod 612, the two ends of the spring B614 being fixedly connected to the moving block B613 and the installation plate 611 respectively, a shaped plate 617 fixedly connected to the moving rod 612, and a roller 615 arranged on the inner side of the shaped plate 617. The side, close to the moving block B613, of the moving block A610 is provided with an inclined surface, so that when the moving block A610 is in contact with the moving block B613, the moving block A610 will push the moving block B613 to move to the lower end under the action of the inclined surface. The upper end of the placing plate 5 is provided with a sliding groove B616, and the shaped pushing block 67 is slidably connected to the inside of the sliding groove B616, so as to ensure the stability of the sliding of the shaped pushing block 67.

[0038] In use, first, the resistance is placed on the upper end of the placement plate 5, and then laser welding is performed by the laser welding gun 3. When the swing rod 46 rotates inward, it pushes the ball 64 in contact with it to move upward. When the ball 64 rises, it drives the hydraulic rod A 63 to move upward. The hydraulic rod B 66, which is slidingly connected in the other port of the hydraulic chamber 62, moves forward. The L-shaped push block 67 can be pushed to move forward in the sliding groove B 616. The L-shaped push block 67 can push the resistance to move through the through slot 412 to the middle of the bending plate 49. When the bending plate 49 rotates to be parallel to the placement plate 5, the front end of the resistance also fits the inside of the L-shaped plate 73. When the hydraulic rod B 66 moves forward, it drives the connecting rod 69 to move forward through the connecting block B 68. The moving block A 610 at the other end of the connecting rod 69 also moves forward. When the moving block A 610 contacts the moving block B 613, the surfaces of the moving block A 610 and the moving block B 613 in contact with each other are inclined. Therefore, when the moving block A 610 continues to move forward, it pushes the moving block B 613 to compress the spring B 614 and move downward. The moving rod 612 also moves downward. The L-shaped plate 617 fixedly connected to the bottom of the moving rod 612 also moves downward. When the moving block A 610 moves to the upper end of the moving block B 613, the roller 615 inside the L-shaped plate 617 contacts the surface of the resistance, thereby limiting the up-down orientation of the resistance. When the bending is completed, the swing rod 46 rotates outward. Under the action of the spring A 65, the hydraulic rod A 63 moves downward, so that it is always in contact with the surface of the swing rod 46. The hydraulic rod B 66 moves backward, thereby driving the L-shaped push block 67 to return to the rear end of the laser welding gun 3. The connecting block B 68 drives the moving block A 610 to move backward through the connecting rod 69. Since the moving block A 610 no longer restricts the moving block B 613, the moving rod 612 rises under the action of the spring B 614, thereby driving the L-shaped plate 617 and the roller 615 to rise.

[0039] Embodiment 3: see Figures 1-7 The stripper assembly 7 comprises two mounting blocks 71, a rotating shaft B 72 rotatably connected between the two mounting blocks 71, an L-shaped plate 73 fixedly sleeved on the outer wall of the rotating shaft B 72, a torsional spring 74 movably sleeved on the outer wall of the rotating shaft B 72, the two ends of the torsional spring 74 being fixedly connected with the mounting blocks 71 and the L-shaped plate 73 respectively, a movable rod 76 fixedly connected to the bottom of the L-shaped plate 73, and an elastic telescopic rod 77 fixedly connected to the outer wall of the L-shaped push block 67. A groove 75 is formed in the inner bottom end of the sliding groove B 616, and an active slot 78 is formed in the bottom of the placement plate 5. The movable rod 76 movably penetrates through the active slot 78. The outer wall of the fixed plate 2 is fixedly connected with a connecting plate 8, and the laser welding gun 3 is fixedly connected to the bottom of the connecting plate 8.

[0040] When the push block 67 moves to the front end along the chute B616, the front elastic telescopic rod 77 will first contact the movable rod 76 at the bottom of the L-shaped plate 73, and because the elastic force of the elastic telescopic rod 77 is greater than that of the torsion spring 74, the elastic telescopic rod 77 will push the movable rod 76 to rotate, and then the L-shaped plate 73 will rotate with the rotating shaft B72, and when the inner side of the L-shaped plate 73 is rotated to contact the placement plate 5, the L-shaped plate 73 cannot rotate at this time, and then when the push block 67 continues to move, the elastic telescopic rod 77 will contract, and because the bottom of the L-shaped plate 73 is in a vertical state with the placement plate 5, the elastic telescopic rod 77 can push the resistor to the upper end of the L-shaped plate 73, and then the inner side of the L-shaped plate 73 can also limit the front end of the resistor, and when the bending is completed, the push block 67 is reset, and then the elastic telescopic rod 77 at the bottom end of the push block 67 will release the limitation of the movable rod 76, and then the torsion spring 74 will rotate the rotating shaft B72, and then the L-shaped plate 73 will rotate outward, and then the bottom of the L-shaped plate 73 will push the resistor after bending from the upper end of the placement plate 5, and then the discharging of the resistor can be realized.

[0041] The above is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A resistance piece laser welding apparatus comprising a base, characterised in that, The upper end of the base is provided with a laser welding gun; The upper end of the base is fixedly connected with a motor, the output end of the motor is fixedly connected with a transmission shaft, the outer wall of the transmission shaft is fixedly sleeved with a worm, the two sides of the worm are engaged with a worm gear, the outer wall of the worm gear is fixedly connected with a rotating shaft A, the other end of the rotating shaft A is fixedly connected with an oscillating rod, the middle part of the oscillating rod is provided with a sliding groove A, the inside of the sliding groove A is slidably connected with a connecting shaft, the outer wall of the connecting shaft is fixedly sleeved with a bending plate, the other end of the connecting shaft is rotatably connected with a sliding sleeve; The upper end of the base is fixedly connected with a fixed plate, the middle part of the fixed plate is fixedly connected with a placing plate, the bending plate is hinged on the two sides of the placing plate, the outer wall of the fixed plate is provided with a pushing and positioning assembly, the upper end of the placing plate is provided with a material removing assembly, the outer wall of the fixed plate is fixedly connected with a connecting plate, and the laser welding gun is fixedly connected at the bottom of the connecting plate. The pushing and positioning assembly comprises a connecting block A, the connecting block A is fixedly connected to the outer wall of the fixed plate, the side surface of the fixed plate is fixedly connected with a hydraulic chamber through the connecting block A, the two ports of the hydraulic chamber are respectively slidably connected with a hydraulic rod A and a hydraulic rod B, the top of the hydraulic rod A is fixedly connected with a ball, the outer wall of the hydraulic rod A is movably sleeved with a spring A, the two ends of the spring A are fixedly connected with the ball and the hydraulic chamber respectively, the other end of the hydraulic rod B is fixedly connected with a shaped pushing block, the outer wall of the hydraulic rod B is fixedly sleeved with a connecting block B, the upper end of the connecting block B is fixedly connected with a connecting rod, the other end of the connecting rod is fixedly connected with a moving block A, the outer wall of the fixed plate is fixedly connected with a mounting plate, the outer wall of the mounting plate is provided with a through hole, the inside of the through hole is slidably connected with a moving rod, the top of the moving rod is fixedly connected with a moving block B, the outer wall of the moving rod is movably sleeved with a spring B, the two ends of the spring B are fixedly connected with the moving block B and the mounting plate respectively, and the moving rod is fixedly connected with a shaped plate, the inner side of the shaped plate is provided with a roller; The material removing assembly comprises two mounting blocks, a rotating shaft B is rotatably connected between the two mounting blocks, the outer wall of the rotating shaft B is fixedly sleeved with an L-shaped plate, the outer wall of the rotating shaft B is movably sleeved with a torsional spring, the two ends of the torsional spring are fixedly connected with the mounting blocks and the L-shaped plate respectively, the bottom of the L-shaped plate is fixedly connected with a movable rod, and the outer wall of the shaped pushing block is fixedly connected with an elastic telescopic rod.

2. The apparatus according to claim 1, wherein The front surface of the fixed plate is fixedly connected with an annular frame, and the sliding sleeve is slidably connected to the outer wall of the annular frame.

3. The apparatus of claim 1, wherein the laser beam is focused on the surface of the resistance member by a focusing lens. The middle part of the bending plate is provided with a through groove, and the width of the through groove is greater than the diameter of the resistance element pin.

4. The apparatus of claim 1, wherein the laser beam is focused on the surface of the resistance member by a focusing lens. The side close to the moving block A and the moving block B of the pushing and positioning assembly is provided with an inclined surface.

5. The apparatus of claim 1, wherein the laser beam is focused on the surface of the resistive element by a focusing lens. The upper end of the placing plate is provided with a sliding groove B, and the shaped pushing block is slidably connected to the inside of the sliding groove B.

6. A resistance element laser welding apparatus according to claim 5, wherein The inside bottom end of the sliding groove B is provided with a groove, the bottom of the placing plate is provided with a movable slot, the movable rod movably penetrates through the movable slot, and the outer wall of the fixed plate is fixedly connected with a connecting plate.

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