Workpiece welding clamp

Abstract

The invention discloses a workpiece welding clamp and belongs to the technical field of welding clamps, the workpiece welding clamp comprises a base, two sets of supporting plates are arranged at the top end of the base, a motor is fixedly connected to the side face of one set of supporting plates, an output shaft of the motor is fixedly connected with a two-way lead screw, and the two sides of the two-way lead screw are in threaded connection with clamps; and rotating rods penetrate through the two supporting plates and are rotationally connected to the interiors of the two supporting plates, a placing frame is fixedly connected between the two rotating rods, and a hydraulic cylinder is fixedly connected to the top end of the base. Through mutual cooperation of the stress rod, the hydraulic cylinder, the one-way rack, the first gear, a positioning hole, a rotating rod, a second gear, a third gear, a positioning ball, a sliding rod, a spring and a shell sleeve, a workpiece can be turned over by 30 degrees every time the workpiece rotates, and a welding gun can weld the surfaces, at all angles, of the workpiece; therefore, manual operation can be reduced, and efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of welding jigs, and more specifically, to a workpiece welding jig. Background Art

[0002] Welding tooling is applied in manufacturing fields such as aviation, construction, and automobile production. Excellent welding tooling equipment can greatly improve the welding processing technology level and product quality, increase production efficiency, reduce production costs, and bring significant advantages to mechanical production and processing. A jig refers to a device used in the mechanical manufacturing process to fix the processing object, making it occupy the correct position to receive construction or inspection. Broadly speaking, any device used in any process of the technological process to quickly, conveniently, and safely install the workpiece can be called a jig. A welding jig is a jig used to ensure the dimensions of the welded parts, improve the assembly accuracy and efficiency, and prevent welding deformation.

[0003] Most of the existing processing methods can only perform planar welding on the workpieces to be welded, and it is difficult to weld different sides of the workpieces at different angles. Therefore, the welding is not comprehensive enough. In this case, the quality of the welded products is not easy to guarantee, which affects the subsequent assembly accuracy of the products and reduces the production efficiency. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a workpiece welding jig, which solves the problems raised in the above background art.

[0005] To achieve the above object, the present application provides a workpiece welding fixture, including a base. Two sets of support plates are arranged at the top of the base. A motor is fixedly connected to the side of one set of support plates. The output shaft of the motor is fixedly connected to a bidirectional lead screw. Clamps are threadedly connected to both sides of the bidirectional lead screw. Two sets of rotating rods penetrate and are rotatably connected inside the two sets of support plates. A placement frame is fixedly connected between the two sets of rotating rods. A hydraulic cylinder is fixedly connected to the top of the base. One end inside the hydraulic cylinder is slidably connected to a force-bearing rod through a piston, and the other end inside the hydraulic cylinder is slidably connected to a one-way rack through a piston. A gear one is fixedly connected to the outside of one set of rotating rods. A rotating rod is rotatably connected to the side of one set of support plates. A gear two is fixedly connected to the outside of the rotating rod. A gear three is fixedly connected to the end of the rotating rod away from the support plate. A housing sleeve is fixedly connected to the side of one set of support plates. A sliding rod is slidably connected inside the housing sleeve. One end of the sliding rod is fixedly connected to a positioning ball, and the other end of the sliding rod is elastically connected to a spring. By arranging the force-bearing rod, the hydraulic cylinder, the one-way rack, the gear one, the positioning hole, the rotating rod, the gear two, the gear three, the positioning ball, the sliding rod, the spring, and the housing sleeve to cooperate with each other, the workpiece can be turned over at an angle of 30 degrees per rotation, so that the welding torch can weld the surfaces of all angles of the workpiece, thereby reducing manual operation and improving efficiency.

[0006] Preferably, a spraying assembly for cooling the part of the placement frame during the operation of the welding torch is assembled at the top of the base, and a cleaning assembly for cleaning the welding slag dropped after the workpiece is welded is assembled at the top of the base.

[0007] Preferably, positioning holes are formed on the surface of the gear one. There are six groups of positioning holes in total. The one-way rack meshes with the gear three.

[0008] Preferably, the gear two meshes with the gear one, and the force-bearing rod is located on the movement track of the clamp.

[0009] Preferably, the spraying assembly includes a guide plate and a water tank. The guide plate is fixedly connected to the side of the support plate. A special-shaped rack rod is slidably connected to the side of the guide plate. A push plate is fixedly connected to the end of the special-shaped rack rod away from the guide plate. A water tank is fixedly connected to the top of the base. A one-way valve is assembled at the top of the water tank. The side of the water tank is communicated with a storage water tank through a water delivery pipe. A spray head is assembled on the side of the storage water tank. By arranging the guide plate, the special-shaped rack rod, the push plate, the storage water tank, the spray head, the one-way valve, the water delivery pipe, and the water tank to cooperate with each other, it can be made that through the gradual intermittent pushing of the push plate, the water resource also flows out intermittently synchronously, so that the two spray heads spray water mist during the welding of the workpiece to cool it.

[0010] Preferably, there are two groups of the spray heads, and the angles of the two groups of spray heads are both aligned with the placement frame, and the push plate is slidably connected inside the water tank.

[0011] Preferably, the cleaning assembly includes a guiding track fixedly connected to the top end of the base. A moving plate is slidably connected inside the guiding track. A special-shaped groove is formed on the surface of the moving plate. An L-shaped rod is fixedly connected to the side surface of the moving plate. A scraping plate is fixedly connected to one end of the L-shaped rod away from the moving plate. A turntable is fixedly connected to the outer side of the rotating rod. A rotating rod is fixedly connected to the surface of the turntable. The bottom end of the base is fixedly connected with a recycling box through bolts.

[0012] Preferably, the rotating rod penetrates inside the special-shaped groove, and the rotating rod is located at the edge of the turntable. By arranging the scraping plate, the L-shaped rod, the recycling box, the turntable, the guiding track, the moving plate, the special-shaped groove, and the rotating rod to cooperate with each other, the scraping plate can reciprocally scrape on the surface of the base, so as to clean and scrape impurities such as welding slag remaining on the base during workpiece welding, thereby reducing the labor force of workers.

[0013] The beneficial effects of the present application are as follows: (1) By arranging the stress rod, the hydraulic cylinder, the one-way rack, the first gear, the positioning hole, the rotating rod, the second gear, the third gear, the positioning ball, the sliding rod, the spring, and the housing sleeve to cooperate with each other, the present application can turn the workpiece by an angle of 30 degrees each time it rotates, so that the welding torch can weld each angle surface of the workpiece, thereby reducing manual operation and improving efficiency.

[0014] (2) By arranging the guiding plate, the special-shaped rack rod, the push plate, the water storage tank, the spray head, the one-way valve, the water delivery pipe, and the water tank to cooperate with each other, the present application can make the water resources also intermittently flow out synchronously through the gradual intermittent push of the push plate, so that the two groups of spray heads spray water mist during workpiece welding to cool it down.

[0015] (3) By arranging the scraping plate, the L-shaped rod, the recycling box, the turntable, the guiding track, the moving plate, the special-shaped groove, and the rotating rod to cooperate with each other, the present application can make the scraping plate reciprocally scrape on the surface of the base, so as to clean and scrape impurities such as welding slag remaining on the base during workpiece welding, thereby reducing the labor force of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present application, making other features, purposes, and advantages of the present application more obvious. The schematic embodiments and descriptions of the drawings of the present application are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings: Figure 1 It is a front structural schematic diagram of the overall appearance of the present invention; Figure 2 It is a back structural schematic diagram of the overall appearance of the present invention; Figure 3 It is a schematic diagram of a partial structure of the present invention Figure 1 ; Figure 4 It is a schematic diagram of a partial structure of the present invention Figure 2 ; Figure 5 It is a schematic diagram of a partial structure of the present invention Figure 3 ; Figure 6 It is a schematic diagram of a partial structure of the present invention Figure 4 ; Figure 7 It is a structural schematic diagram of the spraying assembly of the present invention; Figure 8 It is a partial structural schematic diagram of the spraying assembly of the present invention; Figure 9 It is a structural schematic diagram of the cleaning assembly of the present invention; Figure 10 It is a partial structural schematic diagram of the cleaning assembly of the present invention.

[0017] In the above figures, 1. Base; 2. Motor; 3. Bi-directional lead screw; 4. Clamp; 5. Support plate; 6. Placing frame; 7. Rotating rod; 8. Spraying assembly; 9. Cleaning assembly; 101. Stress rod; 102. Hydraulic cylinder; 103. One-way rack; 104. Gear one; 105. Positioning hole; 106. Rotating rod; 107. Gear two; 108. Gear three; 109. Positioning ball; 110. Sliding rod; 111. Spring; 112. Shell sleeve; 801. Guide plate; 802. Special-shaped rack bar; 803. Pushing plate; 804. Water storage tank; 805. Nozzle; 806. Check valve; 807. Water delivery pipe; 808. Water tank; 901. Scraper; 902. L-shaped rod; 903. Recycling box; 904. Turntable; 905. Guide track; 906. Moving plate; 907. Special-shaped groove; 908. Rotating rod. Detailed implementation manners

[0018] In order to enable those skilled in the art of the present technology to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying 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 of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of the present application.

[0019] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so as to describe the embodiments of this application here. 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 that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0021] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0022] In addition, the terms "install", "set", "be provided with", "connect", "be connected", "be sleeved" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can also be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] It should be noted that, without conflict, the embodiments and features in the embodiments of this application can be combined with each other. The following will refer to the drawings and combine with embodiments to detail this application.

[0024] Embodiment 1, see Figures 1 - 6, this embodiment provides a workpiece welding fixture, including a base 1. At the top of the base 1, there are two groups of support plates 5. The base 1 is used to support the two groups of support plates 5, and at the same time, the two groups of support plates 5 can support the use of the bidirectional lead screw 3. A motor 2 is fixedly connected to the side of one group of support plates 5. The output shaft of the motor 2 is fixedly connected to the bidirectional lead screw 3. When the bidirectional lead screw 3 rotates under the action of the motor 2, it can drive the two groups of clamps 4 to move towards each other or away from each other. At the same time, both ends of the two groups of clamps 4 with clamping force are assembled through universal shafts, so that when the placement frame 6 rotates, the two groups of clamps 4 can still position the workpiece on the placement frame 6. Both sides of the bidirectional lead screw 3 are threadedly connected with clamps 4. Two rotating rods 7 penetrate and are rotatably connected inside the two groups of support plates 5. A placement frame 6 is fixedly connected between the two rotating rods 7. A placement frame 6 is fixed between the two rotating rods 7. Therefore, when the rotating rod 7 is driven to rotate, the placement frame 6 can move synchronously. A hydraulic cylinder 102 is fixedly connected to the top of the base 1. One end inside the hydraulic cylinder 102 is slidably connected with a force-bearing rod 101 through a piston. When the force-bearing rod 101 is squeezed by the clamp 4, the internal liquid pressure of the hydraulic cylinder 102 increases at this time, so that the one-way rack 103 can be pushed out. At the same time, there is an elastic piece at the top of the one-way rack 103, so the one-way rack 103 can only be engaged unidirectionally. The other end inside the hydraulic cylinder 102 is slidably connected with a one-way rack 103 through a piston. A gear one 104 is fixedly connected to the outside of one rotating rod 7. A rotating rod 106 is rotatably connected to the side of one group of support plates 5. A gear two 107 is fixedly connected to the outside of the rotating rod 106. There are three teeth in one group on the gear two 107, and a total of six groups are provided. Therefore, the gear two 107 meshes with the gear one 104, and the angles by which the gear two 107 drives the gear one 104 to rotate are all sixty degrees. A gear three 108 is fixedly connected to the end of the rotating rod 106 away from the support plate 5. A housing sleeve 112 is fixedly connected to the side of one group of support plates 5. A sliding rod 110 is slidably connected inside the housing sleeve 112. One end of the sliding rod 110 is fixedly connected with a positioning ball 109. The size of the positioning ball 109 is the same as the size of the positioning hole 105. The other end of the sliding rod 110 is elastically connected with a spring 111. When the gear one 104 rotates, the spring 111 is elastically compressed at this time. When the rotation of the gear one 104 ends, the spring 111 can drive the positioning ball 109 to cooperate with the positioning hole 105 under the action of its own resilience force. A spraying assembly 8 for cooling the part of the placement frame 6 during the operation of the welding torch is assembled on the top of the base 1. A cleaning assembly 9 for cleaning the welding slag dropped after the workpiece welding is completed is assembled on the top of the base 1. A positioning hole 105 is provided on the surface of the gear one 104. The function of the positioning hole 105 is to position the rotated placement frame 6 through the cooperation of the positioning ball 109 and the positioning hole 105 every thirty degrees after the placement frame 6 rotates. A total of six groups of positioning holes 105 are provided. The one-way rack 103 meshes with the gear three 108,The second gear 107 meshes with the first gear 104, and the force-receiving rod 101 is located on the movement track of the fixture 4.

[0025] During use, first place the workpiece to be welded inside the placement frame 6. Then, turn on the switch of the motor 2 so that the output shaft of the motor 2 can drive the bidirectional lead screw 3 to rotate, and then the two fixtures 4 can move towards each other, thereby positioning the workpiece on the placement frame 6. After the welding torch completes the welding of the front side of the workpiece, at this time, the two fixtures 4 move away from each other under the action of the bidirectional lead screw 3. One of the fixtures 4 can squeeze the force-receiving rod 101 during the movement. When the force-receiving rod 101 is squeezed, the liquid pressure inside the hydraulic cylinder 102 increases, so that the unidirectional rack 103 can be pushed out. When the unidirectional rack 103 is pushed out, it can mesh with the third gear 108 at this time. Therefore, it can drive the third gear 108 to rotate. When the third gear 108 rotates, the rotating rod 106 can also rotate synchronously. At the same time, since the second gear 107 is fixed to the rotating rod 106, the second gear 107 can also rotate, so that it can mesh with the first gear 104 and drive the first gear 104 to rotate. Since there are six groups of three teeth each on the second gear 107, every time the second gear 107 rotates once, it can drive the first gear 104 to rotate, and the rotation angle is 30 degrees. When the first gear 104 drives the rotation movement, the positioning ball 109 is separated from the positioning hole 105 at this time, and the spring 111 is elastically compressed. After the first gear 104 rotates 30 degrees, the positioning hole 105 on the first gear 104 cooperates with the positioning ball 109 again to position the first gear 104. At the same time, the two fixtures 4 position the workpiece on the placement frame 6 in the direction of approaching each other, and the welding torch performs welding again. In this way, each rotation angle of the placement frame 6 is 30 degrees, and it rotates six times in total, so that the workpiece can be gradually turned over, so that all angles of the workpiece can be welded.

[0026] Example 2, see Figures 1 - 8, on the basis of Embodiment 1, in the present application, the spraying assembly 8 includes a guide plate 801 and a water tank 808. The function of the guide plate 801 is to guide the movement of the special-shaped rack bar 802, prevent the special-shaped rack bar 802 from skewing during movement, and thus cause movement errors. The guide plate 801 is fixedly connected to the side of the support plate 5. The side of the guide plate 801 is slidably connected to the special-shaped rack bar 802. One end of the special-shaped rack bar 802 away from the guide plate 801 is fixedly connected to a push plate 803. One end of the special-shaped rack bar 802 away from the guide plate 801 is fixed with a push plate 803. Therefore, when the special-shaped rack bar 802 moves, it can drive the push plate 803 to move synchronously. The top of the base 1 is fixedly connected to a water tank 808. A one-way valve 806 is assembled at the top of the water tank 808. The top of the water tank 808 is equipped with a water inlet for the entry of water resources. The side of the water tank 808 is connected to a water storage tank 804 through a water pipe 807. Sprayers 805 are assembled on the side of the water storage tank 804. There are two groups of sprayers 805 in total, and the angles of the two groups of sprayers 805 are both aligned with the placement frame 6. The push plate 803 is slidably connected inside the water tank 808. The push plate 803 is slidably connected inside the water tank 808. Therefore, the movement of the push plate 803 squeezes the water inside the water tank 808, causing the water resources to flow into the water pipe 807.

[0027] During use, when the first gear 104 rotates 30 degrees each time and stays for a period of time, since the first gear 104 and the special-shaped rack bar 802 are in a meshing state, it can drive the special-shaped rack bar 802 to move. When the special-shaped rack bar 802 moves, it can drive the push plate 803 to move synchronously, so that the push plate 803 can perform periodic forward pushing movements inside the water tank 808, enabling the water resources inside the water tank 808 to enter the water pipe 807 and then enter the interior of the water storage tank 804 from the water pipe 807, so that the two groups of sprayers 805 can spray water, thereby reducing the surrounding temperature during workpiece welding.

[0028] Embodiment 3, see Figures 1 - 10, on the basis of Embodiment 1, in the present application, the cleaning component 9 includes a guiding track 905. The function of the guiding track 905 is to guide the movement of the moving plate 906, prevent the moving plate 906 from shifting during movement and thus cause movement errors. The guiding track 905 is fixedly connected to the top end of the base 1. The moving plate 906 is slidably connected inside the guiding track 905. A special-shaped groove 907 is formed on the surface of the moving plate 906. An L-shaped rod 902 is fixedly connected to the side of the moving plate 906. The function of the L-shaped rod 902 is to link the moving plate 906 and the scraper 901 so that the scraper 901 can move synchronously with the moving plate 906. One end of the L-shaped rod 902 away from the moving plate 906 is fixedly connected to the scraper 901. The function of the scraper 901 is to scrape the welding slag remaining on the surface of the base 1 after welding the workpiece, so as to clean the surface of the base 1. A turntable 904 is fixedly connected to the outer side of the rotating rod 7. A rotating rod 908 is fixedly connected to the surface of the turntable 904. The bottom end of the base 1 is fixedly connected with a recovery box 903 through bolts. The recovery box 903 is used to recover the welding slag scraped by the scraper 901. The rotating rod 908 penetrates inside the special-shaped groove 907, and the rotating rod 908 is located at the edge of the turntable 904.

[0029] During use, when the rotating rod 106 makes a rotational movement, it can drive the turntable 904 to follow and make a rotational movement. When the turntable 904 makes a rotational movement, it further drives the rotating rod 908 to make a rotational movement inside the special-shaped groove 907. Since the rotating rod 908 makes a rotational movement inside the special-shaped groove 907, the moving plate 906 can make a horizontal reciprocating movement inside the guiding track 905 under the action of the special-shaped groove 907. And under the action of the L-shaped rod 902, the scraper 901 can follow the moving plate 906 to make a reciprocating movement, so as to scrape the welding slag that falls off when welding the workpiece on the surface of the base 1, and make the scraped welding slag enter the inside of the recovery box 903, thus facilitating the staff to process the welding slag inside the recovery box 903.

[0030] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A workpiece welding fixture, including a base (1), two sets of support plates (5) are arranged at the top of the base (1), a motor (2) is fixedly connected to the side of one set of support plates (5), the output shaft of the motor (2) is fixedly connected with a bidirectional lead screw (3), clamping fixtures (4) are threadedly connected to both sides of the bidirectional lead screw (3), and a rotating rod (7) penetrates through and is rotatably connected to the inside of the two sets of support plates (5), and a placing frame (6) is fixedly connected between the two sets of rotating rods (7); It is characterized in that A hydraulic cylinder (102) is fixedly connected to the top of the base (1), a stress rod (101) is slidably connected to one end inside the hydraulic cylinder (102) through a piston, a one-way rack (103) is slidably connected to the other end inside the hydraulic cylinder (102) through a piston, a first gear (104) is fixedly connected to the outer side of one set of rotating rods (7), a rotating rod (106) is rotatably connected to the side of one set of support plates (5), a second gear (107) is fixedly connected to the outer side of the rotating rod (106), a third gear (108) is fixedly connected to the end of the rotating rod (106) far away from the support plate (5), a housing sleeve (112) is fixedly connected to the side of one set of support plates (5), a sliding rod (110) is slidably connected to the inside of the housing sleeve (112), a positioning ball (109) is fixedly connected to one end of the sliding rod (110), and a spring (111) is elastically connected to the other end of the sliding rod (110).

2. The workpiece welding fixture according to claim 1, characterized in that, A spraying assembly (8) for cooling the part of the placing frame (6) during the operation of the welding torch is assembled at the top of the base (1), and a cleaning assembly (9) for cleaning the welding slag dropped after the workpiece welding is completed is assembled at the top of the base (1).

3. The workpiece welding fixture according to claim 1, wherein, A positioning hole (105) is formed on the surface of the first gear (104), a total of six groups of positioning holes (105) are provided, and the one-way rack (103) is engaged with the third gear (108).

4. A workpiece welding fixture according to claim 1, characterized in that, The second gear (107) is engaged with the first gear (104), and the stress rod (101) is located on the movement track of the clamping fixture (4).

5. A workpiece welding fixture according to claim 2, characterized in that, The spraying assembly (8) includes a guide plate (801) and a water tank (808), the guide plate (801) is fixedly connected to the side of the support plate (5), a special-shaped rack rod (802) is slidably connected to the side of the guide plate (801), a push plate (803) is fixedly connected to the end of the special-shaped rack rod (802) far away from the guide plate (801), a water tank (808) is fixedly connected to the top of the base (1), a one-way valve (806) is assembled at the top of the water tank (808), a water storage tank (804) is communicated with the water tank (808) through a water delivery pipe (807) on the side of the water tank (808), and a spray head (805) is assembled on the side of the water storage tank (804).

6. The workpiece welding fixture according to claim 5, characterized in that, A total of two groups of spray heads (805) are provided, and the angles of the two groups of spray heads (805) are both aligned with the placing frame (6), and the push plate (803) is slidably connected to the inside of the water tank (808).

7. The workpiece welding fixture according to claim 1, characterized in that, The cleaning component (9) includes a guiding track (905). The guiding track (905) is fixedly connected to the top end of the base (1). A moving plate (906) is slidably connected inside the guiding track (905). A special-shaped groove (907) is formed on the surface of the moving plate (906). An L-shaped rod (902) is fixedly connected to the side surface of the moving plate (906). A scraping plate (901) is fixedly connected to one end of the L-shaped rod (902) away from the moving plate (906). A turntable (904) is fixedly connected to the outer side of the rotating rod (7). A rotating rod (908) is fixedly connected to the surface of the turntable (904). A recycling box (903) is fixedly connected to the bottom end of the base (1) by bolts.

8. A workpiece welding fixture according to claim 7, characterized in that, The rotating rod (908) penetrates inside the special-shaped groove (907), and the rotating rod (908) is located at the edge of the turntable (904).

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