Transportation mechanism for metal tool welding production line

Abstract

The invention belongs to the technical field of metal welding and conveying, and particularly discloses a conveying mechanism for a metal tool welding production line, the conveying mechanism comprises a conveying mechanism and an adjusting mechanism, a placing mechanism is arranged on the inner side of the conveying mechanism, and the conveying mechanism is arranged on the inner side of the adjusting mechanism; by arranging the adjusting mechanism, the two-way lead screw is driven by the first motor to drive the two adjusting assemblies to synchronously move in opposite directions, the push plates on the two adjusting assemblies are used for directly making contact with and extruding the end faces of the two to-be-welded annular metal tools to be centered, errors generated by manual centering are effectively avoided, and after centering is completed, the centering precision is improved. The adjusting assembly can drive the multiple adjusting blocks to stretch out in the radial direction, the workpiece is firmly fixed from the inside, the second motor drives the workpiece to rotate integrally, the welding gun can be fixed to one point for circumferential welding, the position of the workpiece or the position of the welding gun does not need to be adjusted by interrupting the welding process, and therefore continuous and stable automatic welding is achieved; and the consistency and the production efficiency of welding circular seams are greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of metal welding conveying technology, and specifically discloses a conveying mechanism for a metal tool welding production line. Background Technology

[0002] In the manufacturing process of metal tools, especially for the butt welding of tubular and annular metal parts (such as flanges, bearing rings, pipes, etc.), automated production lines are often used. In such production lines, workpieces are usually transported sequentially to the welding station by conveying mechanisms, such as conveyor belts or roller conveyors.

[0003] Currently, the traditional welding station operation method has the following drawbacks. Existing technology usually requires a separate rotating platform controlled by a drive motor to be set up at the welding station. When the workpiece is delivered, it needs to be transferred from the conveyor line to the rotating platform by a robot or lifting mechanism for circumferential welding. After welding is completed, it is transferred back to the conveyor line. This additional transfer and rotation system not only greatly increases the floor space and equipment cost of the production line, but also makes the production cycle longer and reduces efficiency.

[0004] Therefore, those skilled in the art have proposed a transport mechanism for a metal tool welding production line to solve the problems mentioned above. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a transport mechanism for a metal tool welding production line, so as to solve the problem that the prior art requires additional rotating equipment and has low working efficiency.

[0006] To achieve the above objectives, the present invention provides a transport mechanism for a metal tool welding production line, comprising a conveying mechanism and an adjusting mechanism, wherein a placement mechanism is provided inside the conveying mechanism, and the conveying mechanism is disposed inside the adjusting mechanism. The adjustment mechanism includes a support plate disposed on the top of the conveying mechanism. Two symmetrically distributed support rods are fixedly connected to the bottom of the support plate. A first motor is disposed on the top of the support plate. A bidirectional lead screw is fixedly connected to the output shaft of the first motor. Two symmetrically distributed connecting plates are threaded onto the surface of the bidirectional lead screw. A first hydraulic push rod is disposed on the inner side of the connecting plate. The output shaft of the first hydraulic push rod passes through the connecting plate and is fixedly connected to a mounting plate. An adjustment component is disposed at the bottom of the mounting plate.

[0007] In the above technical solution, preferably, the adjustment component includes a fixing plate fixedly connected to the bottom of the mounting plate, a locking block fixedly connected to one side of the fixing plate, an mounting rod rotatably connected to one side of the fixing plate above the locking block, a fixing block fixedly connected to the other end of the mounting rod, a second motor provided on the other side of the fixing plate, the output shaft of the second motor passing through the fixing plate and fixedly connected to the surface of the mounting rod, and a push plate fixedly connected to the surface of the mounting rod.

[0008] In the above technical solution, preferably, the mounting rod has a liquid storage cavity inside, and a second hydraulic push rod is provided inside the mounting rod. The output shaft of the second hydraulic push rod extends into the liquid storage cavity and is fixedly connected to a squeezing plate that is slidably connected to the inner wall of the liquid storage cavity. Hydraulic oil is filled between the side of the squeezing plate away from the second hydraulic push rod and the liquid storage cavity.

[0009] In the above technical solution, preferably, the fixing block has uniformly distributed adjustment cavities inside, and the fixing block has a connecting cavity that communicates with the liquid storage cavity, and the adjustment cavity is connected to the liquid storage cavity through the connecting cavity.

[0010] In the above technical solution, preferably, a sliding plate is slidably connected to the inner wall of the adjustment cavity, an adjustment rod is fixedly connected to one side of the sliding plate, and the other end of the adjustment rod passes through a fixing block and is fixedly connected to the adjustment block.

[0011] In the above technical solution, preferably, a spring is fixedly connected to the surface of the skateboard, and the other end of the spring is fixedly connected to the inner wall of the adjustment cavity.

[0012] In the above technical solution, preferably, the placement mechanism includes a slider disposed inside the conveying mechanism. The upper end of the slider passes through the conveying mechanism and is fixedly connected to a placement plate. The bottom of the placement plate has two symmetrically distributed slots that match the slots. The surface of the slider is fixedly connected to two symmetrically distributed guide rods that are slidably connected to the inner side of the conveying mechanism.

[0013] In the above technical solution, preferably, the slider has a uniformly distributed temporary storage cavity inside, and a sliding rod is slidably connected to the inner wall of the temporary storage cavity. The upper end of the sliding rod passes through the slider and is fixedly connected to the bottom of the placement plate. The surface of the slider has an air inlet that communicates with the temporary storage cavity, and a first one-way valve is provided inside the air inlet.

[0014] In the above technical solution, preferably, the slider is provided with an exhaust channel communicating with the temporary storage chamber, the inner wall of the exhaust channel is slidably connected with an exhaust pipe, the surface of the placement plate is provided with an exhaust hole communicating with the exhaust pipe, the upper end of the exhaust pipe is fixedly connected to the bottom of the placement plate, and a second one-way valve is provided inside the exhaust pipe.

[0015] In the above technical solution, preferably, the top of the placement plate is provided with evenly distributed guide wheels, the surface of the guide wheels is provided with a support frame, the surface of the support frame is provided with a limit bolt, and the lower end of the limit bolt passes through the support frame and is threadedly connected to the inner wall of the placement plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up an adjustment mechanism, the first motor drives the bidirectional lead screw to drive the two adjustment components to move synchronously towards each other. The push plate on it directly contacts and squeezes the end faces of the two circular metal tools to be welded to center, effectively avoiding the errors caused by manual centering. After centering, the adjustment components can drive multiple adjustment blocks to extend radially, firmly fixing the workpiece from the inside. The second motor drives the workpiece to rotate as a whole. This allows the welding gun to be fixed at one point for circumferential welding without interrupting the welding process to adjust the position of the workpiece or welding gun. This achieves continuous and stable automated welding, greatly improving the consistency of the welded circumferential seam and production efficiency. 2. The adjustment component can be raised and lowered as a whole through the first hydraulic push rod, and by using the cooperation of the locking block and the locking groove at the bottom of the placement plate, the selected single workpiece to be welded and its placement plate can be lifted together, so that it is misaligned in space with other unwelded workpieces on the conveyor line, which effectively prevents the spatter and heat effect generated during welding from affecting the adjacent workpieces and ensures the surface quality of the product. 3. When the placement plate descends and resets, the temporarily stored gas is forced to blow onto the surface of the welded workpiece, which accelerates the airflow and achieves an active air cooling effect, which helps the workpiece dissipate heat quickly and improves the working environment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the placement mechanism of the present invention; Figure 3 for Figure 2 Enlarged view of A in the middle; Figure 4 This is a schematic diagram of the adjustment mechanism of the present invention; Figure 5 This is a schematic diagram of the structure of the adjustment component of the present invention; Figure 6 for Figure 5 Enlarged view of B in the middle; Figure 7 This is a schematic diagram showing the connection of the first hydraulic push rod, the connecting plate, and the mounting plate of the present invention.

[0018] In the diagram: 1. Conveying mechanism; 2. Adjusting mechanism; 201. Support rod; 202. Support plate; 203. First motor; 204. Connecting plate; 205. Bidirectional lead screw; 206. First hydraulic push rod; 207. Mounting plate; 21. Adjusting assembly; 2101. Fixing plate; 2102. Locking block; 2103. Second motor; 2104. Mounting rod; 2105. Second hydraulic push rod; 2106. Push plate; 2107. Spring; 2108. Liquid storage chamber; 2109. Extrusion plate; 2110. Adjusting block; 2111. Adjusting rod; 2112. Fixing block; 2113. Connecting cavity; 2114. Adjusting cavity; 2115. Slide plate; 3. Placement mechanism; 301. Placement plate; 302. Slider; 303. Air inlet; 304. First one-way valve; 305. Guide rod; 306. Exhaust channel; 307. Sliding rod; 308. Guide wheel; 309. Limit bolt; 310. Exhaust hole; 311. Exhaust pipe. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0021] like Figures 1-7 The conveying mechanism shown is for a metal tool welding production line, including a conveying mechanism 1 and an adjusting mechanism 2. A placement mechanism 3 is provided inside the conveying mechanism 1, and the conveying mechanism 1 is located inside the adjusting mechanism 2. The adjusting mechanism 2 includes a support plate 202 disposed on the top of the conveying mechanism 1. Two symmetrically distributed support rods 201 are fixedly connected to the bottom of the support plate 202. A first motor 203 is disposed on the top of the support plate 202. A bidirectional lead screw 205 is fixedly connected to the output shaft of the first motor 203. Two symmetrically distributed connecting plates 204 are threadedly connected to the surface of the bidirectional lead screw 205. A first hydraulic push rod 206 is disposed on the inner side of the connecting plate 204. The output shaft of the first hydraulic push rod 206 passes through the connecting plate 204 and is fixedly connected to the mounting plate 207. An adjusting component 21 is disposed at the bottom of the mounting plate 207.

[0022] The first motor 203 can drive the bidirectional lead screw 205 to rotate in both directions. During this process, the two connecting plates 204 can move closer or further apart, thereby achieving the effect of adjusting the position of the two adjusting components 21. By activating the first hydraulic push rod 206, the height of the mounting plate 207 can be adjusted, thereby achieving the adjustment of the height of the adjusting component 21.

[0023] like Figures 1-7 As shown, the adjustment assembly 21 includes a fixing plate 2101 fixedly connected to the bottom of the mounting plate 207. A locking block 2102 is fixedly connected to one side of the fixing plate 2101. A mounting rod 2104 located above the locking block 2102 is rotatably connected to one side of the fixing plate 2101. A fixing block 2112 is fixedly connected to the other end of the mounting rod 2104. A second motor 2103 is provided on the other side of the fixing plate 2101. The output shaft of the second motor 2103 passes through the fixing plate 2101 and is fixedly connected to the surface of the mounting rod 2104. A push plate 2106 is fixedly connected to the surface of the mounting rod 2104.

[0024] The mounting rod 2104 has a liquid storage cavity 2108 inside, and a second hydraulic push rod 2105 is provided inside the mounting rod 2104. The output shaft of the second hydraulic push rod 2105 extends into the liquid storage cavity 2108 and is fixedly connected to a pressing plate 2109 that is slidably connected to the inner wall of the liquid storage cavity 2108. Hydraulic oil is filled between the side of the pressing plate 2109 away from the second hydraulic push rod 2105 and the liquid storage cavity 2108.

[0025] The fixed block 2112 has evenly distributed adjustment cavities 2114 inside, and a connecting cavity 2113 that communicates with the liquid storage cavity 2108 inside. The adjustment cavity 2114 is connected to the liquid storage cavity 2108 through the connecting cavity 2113.

[0026] The inner wall of the adjustment cavity 2114 is slidably connected to a slide plate 2115. One side of the slide plate 2115 is fixedly connected to an adjustment rod 2111. The other end of the adjustment rod 2111 passes through a fixing block 2112 and is fixedly connected to an adjustment block 2110.

[0027] A spring 2107 is fixedly connected to the surface of the slide plate 2115, and the other end of the spring 2107 is fixedly connected to the inner wall of the adjustment cavity 2114.

[0028] The position of the adjustment component 21 is adjusted by using the first motor 203, the double-acting lead screw 205 and the first hydraulic push rod 206. The specific steps are as follows: first, the first motor 203 and the double-acting lead screw 205 are used to bring the two adjustment components 21 closer to each other, and then the position of the adjustment component 21 is raised by the first hydraulic push rod 206. Specifically, during the butt welding of the annular metal fittings, as the two adjusting components 21 approach each other, the fixing block 2112 can be inserted into the inner side of the annular metal fitting, and at the same time, the push plate 2106 can contact the end of the metal fitting. During the approach of the two adjusting components 21, the two metal fittings can be squeezed and aligned, allowing them to fit tightly together. Furthermore, by activating the second hydraulic push rod 2105, the squeezing plate 2109 can be driven to squeeze the hydraulic oil inside the reservoir 2108, allowing the squeezed hydraulic oil to be injected into the connecting cavity 2113, and then into the adjusting cavity 2114, pushing the sliding plate 2115 to compress the spring 2107 and causing the adjusting rod 2111 to pass through the fixing block 2112 (e.g., ...). Figure 5 The diagram shows the state where spring 2107 is compressed and adjusting rod 2111 is extended, which in turn causes adjusting block 2110 to be tightly pressed against the inner side of the annular metal tool. At this time, the second motor 2103 can be started to drive the mounting rod 2104 to rotate, which in turn drives the fixing block 2112, adjusting rod 2111 and adjusting block 2110 to rotate synchronously, which in turn drives the metal tool to rotate synchronously. Thus, welding between two annular metal tools can be achieved without changing the position of the welding gun during the welding process. There is no need to use a separate adapter platform to rotate the metal tool, and there is no need to adjust the position of the welding gun to achieve welding between two metal rings. This reduces the production line construction cost and the floor space required. When the second hydraulic push rod 2105 is reset, it can synchronously drive the extrusion plate 2109 to be reset. Under the action of the spring 2107, it drives the slide plate 2115 to be reset, thereby squeezing the hydraulic oil stored in the regulating cavity 2114 and guiding it back to the storage cavity 2108 through the connecting cavity 2113. Specifically, the push plate 2106 may be made of an elastic material to accommodate minor deviations in the workpiece surface.

[0029] like Figures 1-7 As shown, the placement mechanism 3 includes a slider 302 disposed inside the conveying mechanism 1. The upper end of the slider 302 extends through the conveying mechanism 1 and is fixedly connected to a placement plate 301. The bottom of the placement plate 301 has two symmetrically distributed slots that match the slots with the block 2102. The surface of the slider 302 is fixedly connected to two symmetrically distributed guide rods 305, which are slidably connected to the inner side of the conveying mechanism 1.

[0030] The slider 302 has a uniformly distributed temporary storage cavity inside. A sliding rod 307 is slidably connected to the inner wall of the temporary storage cavity. The upper end of the sliding rod 307 passes through the slider 302 and is fixedly connected to the bottom of the placement plate 301. An air inlet 303 communicating with the temporary storage cavity is opened on the surface of the slider 302. A first one-way valve 304 is installed inside the air inlet 303.

[0031] The slider 302 has an exhaust channel 306 that communicates with the temporary storage chamber. An exhaust pipe 311 is slidably connected to the inner wall of the exhaust channel 306. An exhaust hole 310 that communicates with the exhaust pipe 311 is opened on the surface of the placement plate 301. The upper end of the exhaust pipe 311 is fixedly connected to the bottom of the placement plate 301. A second one-way valve is provided inside the exhaust pipe 311.

[0032] The top of the placement plate 301 is provided with evenly distributed guide wheels 308, the surface of the guide wheels 308 is provided with a support frame, the surface of the support frame is provided with a limit bolt 309, the lower end of the limit bolt 309 passes through the support frame and is threadedly connected to the inner wall of the placement plate 301.

[0033] During the process of the first motor 203 and the bidirectional lead screw 205 driving the two adjustment components 21 to approach each other, the locking block 2102 can be inserted into the slot. Then, during the process of the first hydraulic push rod 206 driving the adjustment component 21 to move upward, the locking block 2102 can be used to lift the placement plate 301, thereby achieving the effect of adjusting the height of the placement plate 301. The placement mechanism 3 on the production line consists of multiple placements and is synchronously conveyed by the conveying mechanism 1. By lifting the height of a single placement plate 301, the metal tool being welded is spatially misaligned with the metal tools on other adjacent placement plates 301, preventing the solder from splashing onto other metal tools during the welding process and affecting product quality. The guide wheel 308 can radially limit the metal tool without affecting the rotation of the metal tool driven by the adjustment component 21. During the upward movement of the placement plate 301, the sliding rod 307 moves upward synchronously, increasing the space inside the temporary storage chamber. This allows outside air to be injected into the temporary storage chamber through the first one-way valve 304. During the resetting process of the placement plate 301, the sliding rod 307 resets and compresses the gas inside the temporary storage chamber. This gas is then discharged through the exhaust channel 306, exhaust pipe 311, and exhaust hole 310, which accelerates the airflow above the placement plate 301 and reduces the residual heat after welding of metal utensils. The first one-way valve 304 and the second one-way valve are used to restrict the direction of gas flow. Specifically, the device is equipped with a PLC control cabinet for controlling the first motor 203, the second motor 2103, the first hydraulic push rod 206, the second hydraulic push rod 2105, and the conveying mechanism 1. Working principle: A circular metal tool is placed on a placement plate 301 and conveyed by a conveying mechanism 1. The conveying mechanism 1 pauses during welding and resumes conveying after welding is completed and the tool is reset. The position of the adjusting component 21 is adjusted using a first motor 203, a bidirectional lead screw 205, and a first hydraulic push rod 206. Specifically, the first motor 203 and bidirectional lead screw 205 bring the two adjusting components 21 closer together, and then the first hydraulic push rod 206 raises the position of the adjusting component 21. During this process, the fixing block 2112 can be inserted into the inner side of the circular metal tool, and the push plate 2106 can contact the end of the metal tool. During this process, the two adjusting components 21 can be squeezed and aligned, ensuring they are tightly pressed together. Furthermore, the second hydraulic push rod 2105 can be activated to drive the pressing plate 2109 to press against the storage... The hydraulic oil inside the liquid chamber 2108 is squeezed, allowing it to be injected into the connecting chamber 2113, and then into the adjusting chamber 2114. This pushes the sliding plate 2115 to compress the spring 2107, causing the adjusting rod 2111 to pass through the fixed block 2112. This causes the adjusting block 2110 to press tightly against the inner side of the annular metal fixture. At this point, the second motor 2103 can be started to rotate the mounting rod 2104, which in turn causes the fixed block 2112, adjusting rod 2111, and adjusting block 2110 to rotate synchronously. This, in turn, causes the metal fixture to rotate synchronously. Thus, welding between two annular metal fixtures can be achieved without changing the position of the welding torch during the welding process. There is no need to use a separate adapter platform to rotate the metal fixtures, and there is no need to adjust the position of the welding torch to weld between the two metal rings. This reduces the production line setup cost and the floor space required.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A transport mechanism for a metal tool welding production line, comprising a conveying mechanism (1) and an adjusting mechanism (2), wherein a placement mechanism (3) is provided inside the conveying mechanism (1), and the conveying mechanism (1) is disposed inside the adjusting mechanism (2); characterized in that, The adjustment mechanism (2) includes a support plate (202) disposed on the top of the conveying mechanism (1). Two support rods (201) are fixedly connected to the bottom of the support plate (202) and are symmetrically distributed. A first motor (203) is disposed on the top of the support plate (202). A bidirectional lead screw (205) is fixedly connected to the output shaft of the first motor (203). Two connecting plates (204) are threadedly connected to the surface of the bidirectional lead screw (205) and are symmetrically distributed. A first hydraulic push rod (206) is disposed on the inner side of the connecting plate (204). The output shaft of the first hydraulic push rod (206) passes through the connecting plate (204) and is fixedly connected to the mounting plate (207). An adjustment component (21) is disposed at the bottom of the mounting plate (207).

2. The conveying mechanism for a metal tool welding production line according to claim 1, characterized in that, The adjustment assembly (21) includes a fixing plate (2101) fixedly connected to the bottom of the mounting plate (207). A locking block (2102) is fixedly connected to one side of the fixing plate (2101). An mounting rod (2104) located above the locking block (2102) is rotatably connected to one side of the fixing plate (2101). A fixing block (2112) is fixedly connected to the other end of the mounting rod (2104). A second motor (2103) is provided on the other side of the fixing plate (2101). The output shaft of the second motor (2103) passes through the fixing plate (2101) and is fixedly connected to the surface of the mounting rod (2104). A push plate (2106) is fixedly connected to the surface of the mounting rod (2104).

3. A conveying mechanism for a metal tool welding production line according to claim 2, characterized in that, The mounting rod (2104) has a liquid storage cavity (2108) inside, and a second hydraulic push rod (2105) is provided inside the mounting rod (2104). The output shaft of the second hydraulic push rod (2105) extends into the liquid storage cavity (2108) and is fixedly connected to a pressing plate (2109) that is slidably connected to the inner wall of the liquid storage cavity (2108). The side of the pressing plate (2109) away from the second hydraulic push rod (2105) and the liquid storage cavity (2108) are filled with hydraulic oil.

4. A conveying mechanism for a metal tool welding production line according to claim 3, characterized in that, The fixed block (2112) has uniformly distributed adjustment cavities (2114) inside, and the fixed block (2112) has a connecting cavity (2113) that communicates with the liquid storage cavity (2108) inside, and the adjustment cavity (2114) is connected to the liquid storage cavity (2108) through the connecting cavity (2113).

5. A conveying mechanism for a metal tool welding production line according to claim 4, characterized in that, The inner wall of the adjustment cavity (2114) is slidably connected to a slide plate (2115), and an adjustment rod (2111) is fixedly connected to one side of the slide plate (2115). The other end of the adjustment rod (2111) passes through the fixing block (2112) and is fixedly connected to the adjustment block (2110).

6. A conveying mechanism for a metal tool welding production line according to claim 5, characterized in that, A spring (2107) is fixedly connected to the surface of the slide plate (2115), and the other end of the spring (2107) is fixedly connected to the inner wall of the adjustment cavity (2114).

7. A conveying mechanism for a metal tool welding production line according to claim 2, characterized in that, The placement mechanism (3) includes a slider (302) disposed inside the conveying mechanism (1). The upper end of the slider (302) passes through the conveying mechanism (1) and is fixedly connected to a placement plate (301). The bottom of the placement plate (301) has two symmetrically distributed slots that match the slots and the block (2102). The surface of the slider (302) is fixedly connected to two symmetrically distributed guide rods (305), which are slidably connected to the inner side of the conveying mechanism (1).

8. A conveying mechanism for a metal tool welding production line according to claim 7, characterized in that, The slider (302) has a uniformly distributed temporary storage cavity inside. A sliding rod (307) is slidably connected to the inner wall of the temporary storage cavity. The upper end of the sliding rod (307) passes through the slider (302) and is fixedly connected to the bottom of the placement plate (301). An air inlet (303) communicating with the temporary storage cavity is opened on the surface of the slider (302). A first one-way valve (304) is provided inside the air inlet (303).

9. A conveying mechanism for a metal tool welding production line according to claim 8, characterized in that, The slider (302) is provided with an exhaust channel (306) that communicates with the temporary storage chamber. An exhaust pipe (311) is slidably connected to the inner wall of the exhaust channel (306). An exhaust hole (310) that communicates with the exhaust pipe (311) is opened on the surface of the placement plate (301). The upper end of the exhaust pipe (311) is fixedly connected to the bottom of the placement plate (301). A second one-way valve is provided inside the exhaust pipe (311).

10. A transport mechanism for a metal tool welding production line according to claim 9, characterized in that, The top of the placement plate (301) is provided with evenly distributed guide wheels (308), the surface of the guide wheels (308) is provided with a support frame, the surface of the support frame is provided with a limit bolt (309), the lower end of the limit bolt (309) passes through the support frame and is threadedly connected to the inner wall of the placement plate (301).

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