Gluing tool for three-phase copper bar

Abstract

The utility model belongs to the technical field of gluing tools, and particularly relates to a gluing tool for a three-phase copper bar. A controller is installed on the front side of a base, first electric sliding rails are arranged on the left side and the right side of the top of the base, a U-shaped installation frame is assembled on the two first electric sliding rails jointly in a sliding mode, a second electric sliding rail is arranged on the top of the U-shaped installation frame, and a sliding block is assembled on the second electric sliding rail in a sliding mode; the first connecting pipe is fixedly installed at the bottom of the assembling mechanism. The right side of the periphery of the first connecting pipe fixedly communicates with a connecting pipe. The assembling block is fixedly mounted on the right side of the assembling mechanism, the double-pipe gluing device is obliquely assembled on the front side of the assembling block, and one end of the mixing pipe is connected with one end of the connecting pipe; the mixing mechanism is fixedly mounted in the mixing pipe; the glue mixing device is simple in structure and reasonable in design, when the glue mixing device is used, two kinds of glue are mixed through the mixing mechanism and then discharged in the glue generation process, the processing efficiency is not affected, meanwhile, the glue mixing quality is good, and the glue forming quality is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of glue application tooling technology, specifically relating to glue application tooling for three-phase copper busbars. Background Technology

[0002] A three-phase copper busbar is a type of copper busbar consisting of three copper wires, primarily used for power transmission in three-phase electrical systems. Its main structure includes conductor coils, a housing, a plug, insulating sheets, and an oil reservoir. The copper conductor coils are made from high-purity electrolytic copper and processed using advanced casting techniques and technologies.

[0003] When processing three-phase copper busbars, glue application fixtures are required for assembly and fixation. During glue application, two types of glue are usually mixed to form a new density of glue to meet the application requirements. In existing technology, the two types of glue are usually squeezed into a pipe and then discharged through the pipe. Although the two types of glue are mixed when squeezed into the pipe, they are not stirred, so the mixing effect is poor, which can easily affect the quality of subsequent glue production and thus affect the application effect. Utility Model Content

[0004] The purpose of this invention is to provide a glue applicator for three-phase copper busbars. During use, a mixing mechanism is used to mix two types of glue during the glue generation process before discharging. This does not affect processing efficiency, while ensuring good glue mixing quality and further improving the quality of the glue.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] Three-phase copper busbar glue application fixture, including

[0007] The base has a controller installed on the front side, and the top left and right sides of the base are provided with first electric slide rails. The two first electric slide rails are slidably fitted with a U-shaped mounting bracket. The top of the U-shaped mounting bracket is provided with a second electric slide rail, and the second electric slide rail is slidably fitted with a slider.

[0008] A fixed mold is fixedly installed on the top of the base;

[0009] A lifting mechanism is fixedly installed on the front side of the slider;

[0010] An assembly mechanism is fixedly installed on the lower front side of the lifting mechanism;

[0011] A first connecting tube is fixedly installed at the bottom of the assembly mechanism. A discharge needle is fixedly connected to the bottom of the first connecting tube. A sealing component is provided inside the first connecting tube. A connecting tube is fixedly connected to the right side of the periphery of the first connecting tube.

[0012] An assembly block is fixedly installed on the right side of the assembly mechanism. A double-tube glue applicator is obliquely mounted on the front side of the assembly block. The two output ends of the double-tube glue applicator are connected to a mixing tube. One end of the mixing tube is connected to one end of the connecting tube.

[0013] A mixing mechanism, which is fixedly installed inside the mixing tube;

[0014] The lifting mechanism, sealing assembly, two first electric slide rails, second electric slide rail, double-tube glue applicator, and mixing mechanism are all electrically connected to the controller.

[0015] As a preferred technical solution, the lifting mechanism includes a mounting box, which is fixedly installed on the front side of the slider. A cylinder is fixedly installed on the bottom side inside the mounting box. The telescopic end of the cylinder extends out of the mounting box and is fixedly installed with a connecting block. A sliding groove is opened on the front side of the connecting block. An adjusting block is provided inside the sliding groove. A fixing component is provided between the adjusting block and the sliding groove. The assembly mechanism is fixedly installed on the front side of the adjusting block. The cylinder is electrically connected to the controller.

[0016] As a preferred technical solution, the assembly mechanism includes a U-shaped assembly, which is fixedly installed on the front side of the adjusting block. The bottom side of the U-shaped assembly has an installation hole, and the first connecting pipe is fixedly installed inside the installation hole.

[0017] As a preferred technical solution, the sealing assembly includes a sealing element, which is slidably and sealingly assembled inside the first connecting pipe. The sealing element has a connecting rod at its top, and the U-shaped assembly has a first electric push rod at its top. The telescopic end of the first electric push rod is fixedly connected to the connecting rod, and the first electric push rod is electrically connected to the controller.

[0018] As a preferred technical solution, a first assembly frame is fixedly installed on the front side of the connecting block, and a second assembly frame is hinged to the front side of the first assembly frame. The first assembly frame and the second assembly frame are closed together to form a closed cavity. A temperature control component is provided inside the closed cavity, and the mixing tube is located inside the closed cavity. A locking component is provided between the first assembly frame and the second assembly frame, and the temperature control component is electrically connected to the controller.

[0019] As a preferred technical solution, the temperature control component is two water-cooled cooling plates or two electrically controlled constant temperature plates.

[0020] As a preferred technical solution, the first assembly frame and the second assembly frame are both provided with assembly ports on the side away from the first connecting pipe. The mixing pipe is symmetrically installed with feed pipes on the right side of its periphery. Both feed pipes are provided with connectors on their periphery. Both output ends of the dual-pipe glue applicator are provided with flexible hoses, and one end of each flexible hose is connected to one of the two connectors.

[0021] As a preferred technical solution, the mixing mechanism includes a rotating shaft. A circular opening is provided at the end of the mixing tube away from the first connecting tube. A disc is rotatably mounted inside the circular opening. One end of the rotating shaft is fixedly connected to the side of the disc near the interior of the mixing tube. Several stirring shafts are arranged around the circumference of the rotating shaft. A circular groove is provided on the side of the disc away from the interior of the mixing tube. A triangular limiting block is fixedly installed on the circumference of the circular groove. A second electric push rod is fixedly installed on the side of the dual-tube glue applicator near the mixing tube. A fixing block is fixedly installed on the telescopic end of the second electric push rod. A motor is fixedly installed on the side of the fixing block away from the mixing tube. The output shaft of the motor passes through the fixing block and is fixedly connected to a connecting shaft. One end of the connecting shaft extends into the circular groove and a triangular extension block is fixedly installed on its circumference. Both the second electric push rod and the motor are electrically connected to a controller.

[0022] The beneficial effects of this utility model are:

[0023] During use, the two components of the adhesive are fully mixed inside the mixing tube during the dispensing process, which further improves the adhesive bonding effect. It is simple and convenient to operate. During this process, a temperature control component is set to ensure that the closed cavity is kept at a constant temperature, making the adhesive more fluid and preventing it from solidifying and affecting the mixing. The dispensing needle can move in multiple directions through the setting of two first electric slide rails, a second electric slide rail, and a cylinder, making it highly applicable. Attached Figure Description

[0024] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of this utility model from another perspective;

[0027] Figure 3 This is a schematic diagram of a first partial structure of the present invention;

[0028] Figure 4 This is a top view of the structure of this utility model;

[0029] Figure 5 This is a schematic diagram of a second partial structure of the present invention;

[0030] Figure 6 This is a schematic diagram of the sealing component structure of this utility model;

[0031] Figure 7 This is a schematic diagram of the hybrid mechanism structure of this utility model. Figure 1 ;

[0032] Figure 8 This is a schematic diagram of the hybrid mechanism structure of this utility model. Figure 2 ;

[0033] Figure 9 This is a schematic diagram of the hybrid mechanism structure of this utility model. Figure 3 ;

[0034] Figure 10 This is a schematic diagram of the hybrid mechanism structure of this utility model. Figure 4 .

[0035] Reference numerals: Base 1, Controller 11, First electric slide rail 12, U-shaped mounting bracket 13, Second electric slide rail 14, Slider 15, Fixed mold 2, Lifting mechanism 3, Mounting box 31, Cylinder 32, Connecting block 33, First assembly frame 331, Second assembly frame 332, Slide groove 34, Adjusting block 35, Assembly mechanism 4, U-shaped assembly 41, First connecting pipe 5, Discharge needle 51, Sealing component 52, Sealing piece 521, Connecting rod 522, First electric push rod 523, Connecting pipe 53, Assembly block 6, Double tube glue applicator 61, Hose 611, Mixing pipe 62, Feed pipe 621, Mixing mechanism 7, Rotating shaft 71, Disc 72, Stirring shaft 73, Triangular limit block 74, Second electric push rod 75, Fixing block 76, Motor 77, Connecting shaft 78, Triangular extension block 79. Detailed Implementation

[0036] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] like Figure 1-10 As shown, the three-phase copper busbar glue applicator of this utility model includes...

[0038] Base 1, a controller 11 is installed on the front side of base 1, and first electric slide rails 12 are provided on the left and right sides of the top of base 1. The two first electric slide rails 12 are slidably fitted with a U-shaped mounting bracket 13. A second electric slide rail 14 is provided on the top of the U-shaped mounting bracket 13. A slider 15 is slidably fitted on the second electric slide rail 14.

[0039] Fixed mold 2 is fixedly installed on the top of base 1;

[0040] The lifting mechanism 3 is fixedly installed on the front side of the slider 15. Specifically, the lifting mechanism 3 includes a mounting box 31, which is fixedly installed on the front side of the slider 15. A cylinder 32 is fixedly installed on the bottom side inside the mounting box 31. The telescopic end of the cylinder 32 extends out of the mounting box 31 and is fixedly installed with a connecting block 33. A slide groove 34 is opened on the front side of the connecting block 33. An adjusting block 35 is provided inside the slide groove 34. A fixing component is provided between the adjusting block 35 and the slide groove 34. An assembly mechanism 4 is fixedly installed on the front side of the adjusting block 35. The cylinder 32 is electrically connected to the controller 11.

[0041] In the initial state, the fixing holes opened in the fixing mold 2 are used to fix the three-phase copper busbar. After the three-phase copper busbar is placed, when applying glue, the controller 11 can control the two first electric sliders 12 to drive the U-shaped mounting bracket 13 to move back and forth, while the second electric slide rail 14 can drive the slider 15 to move left and right. The reciprocating extension and retraction of the cylinder 32 can drive the connecting block 33 to move up and down, thereby realizing the adjustment of the position of the discharge needle 51, so that the position of the discharge needle 51 can be adjusted in the x, y, z directions. It is suitable for glue application, has strong applicability, and is easy to operate.

[0042] Assembly mechanism 4 is fixedly installed on the lower front side of lifting mechanism 3; specifically, assembly mechanism 4 includes U-shaped assembly part 41, which is fixedly installed on the front side of adjusting block 35. The bottom side of U-shaped assembly part 41 has an installation hole, and the first connecting pipe 5 is fixedly installed inside the installation hole.

[0043] The mounting hole provided by the U-shaped fitting 41 enables stable installation of the first connecting pipe 5. When the connecting block 33 moves up and down, it can simultaneously drive the U-shaped fitting 41 to move up and down, causing the discharge needle to move and contact the three-phase copper busbar connection for glue application.

[0044] The sealing assembly 52 includes a sealing element 521, which is slidably and sealingly assembled inside the first connecting pipe 5. The sealing element 521 has a connecting rod 522 on its top. The U-shaped fitting 41 has a first electric push rod 523 on its top. The telescopic end of the first electric push rod 523 is fixedly connected to the connecting rod 522. The first electric push rod 523 is electrically connected to the controller 11.

[0045] In the initial state, when no glue application is required, the sealing component is located in the center inside the first connecting tube 5, thus sealing both the first connecting tube 5 and the connecting tube 53. The glue inside the mixing tube 62 will not flow out. When glue application is required, the two glue storage tubes of the dual-tube glue applicator 61 contain glues of different components. By starting the dual-tube glue applicator 61 through the controller 11, the two glues can be injected into the mixing tube 62 in a certain proportion. The mixing mechanism 7 can be started to stir and mix the two glues. When applying glue, the first electric push rod 523 is started, which pulls up the sealing component 521 and opens the connecting tube 53. The dual-tube glue applicator 61 continuously applies pressure to inject the glue into the mixing tube 62. The mixed glue enters the first connecting tube 5 through the connecting tube 63 and is finally discharged through the discharge needle 51. After the glue application is completed, the extension end of the first electric push rod 523 is moved down to re-seal the first connecting tube 5 and the connecting tube 53. It is convenient to use.

[0046] A first assembly frame 331 is fixedly installed on the front side of the connecting block 33. A second assembly frame 332 is hinged to the front side of the first assembly frame 331. After the first assembly frame 331 and the second assembly frame 332 are closed together, they form a closed cavity. A temperature control component is provided inside the closed cavity. Specifically, the temperature control component is two water-cooled cooling plates or two electrically controlled constant temperature plates. The mixing tube 62 is located inside the closed cavity. A locking component is provided between the first assembly frame 331 and the second assembly frame 332. The temperature control component is electrically connected to the controller 11.

[0047] Either two water-cooled cooling plates or two electrically controlled constant temperature plates can be used. During installation, they are respectively installed on the inner wall of the first assembly frame 331 and the second assembly frame 332, close to each other. The mixing tube 62 is located between the two water-cooled cooling plates or the two electrically controlled constant temperature plates. During use, it can be started or stopped by the controller 11. After starting, the internal space of the sealed cavity will be maintained at about 23 degrees Celsius. Under this temperature condition, the mixed organic potting compound can be guaranteed to maintain optimal flowability. When it is necessary to replace the mixing tube 62, the first assembly frame 331 and the second assembly frame 332 can be opened and the mixing tube 62 can be disassembled.

[0048] Both the first assembly frame 331 and the second assembly frame 332 have assembly ports on the side away from the first connecting pipe 5. The mixing pipe 62 has a feed pipe 621 installed symmetrically on the right side of its periphery. Both feed pipes 621 have connectors on their periphery. Both output ends of the double-pipe glue applicator 61 are equipped with hoses 611, and one end of each hose 611 is connected to one of the two connectors.

[0049] When in use, after the mixing tube 62 is installed, it can be connected to the connectors of the two feed tubes 621 through the two hoses 611. In this way, when the glue is extruded, the glue can be directly squeezed into the mixing tube 62 through the hoses.

[0050] First connecting tube 5, the first connecting tube 5 is fixedly installed at the bottom of the assembly mechanism 4, the bottom of the first connecting tube 5 is fixedly connected to the discharge needle 51, the first connecting tube 5 is provided with a sealing component 52 inside, and the right side of the first connecting tube 5 is fixedly connected to a connecting tube 53.

[0051] Assembly block 6 is fixedly installed on the right side of assembly mechanism 4. A double tube glue applicator 61 is mounted at an angle on the front side of assembly block 6. The two output ends of the double tube glue applicator 61 are connected to a mixing tube 62. One end of the mixing tube 62 is connected to one end of the connecting tube 53.

[0052] The mixing mechanism 7 is fixedly installed inside the mixing tube 62. Specifically, the mixing mechanism 7 includes a rotating shaft 71. A circular opening is provided at the end of the mixing tube 62 away from the first connecting tube 5. A disc 72 is rotatably mounted inside the circular opening. One end of the rotating shaft 71 is fixedly connected to the side of the disc 72 near the inside of the mixing tube 62. Several stirring shafts 73 are arranged around the rotating shaft 71. A circular groove is provided on the side of the disc 72 away from the inside of the mixing tube 62. A triangular limiting block 74 is fixedly installed on the periphery of the circular groove. A second electric push rod 75 is fixedly installed on the side of the double-tube glue applicator 61 near the mixing tube 62. A fixing block 76 is fixedly installed on the telescopic end of the second electric push rod 75. A motor 77 is fixedly installed on the side of the fixing block 76 away from the mixing tube 62. The output shaft of the motor 77 passes through the fixing block 76 and is fixedly connected to a connecting shaft 78. One end of the connecting shaft 78 extends into the circular groove and a triangular extension block 79 is fixedly installed on its periphery. The second electric push rod 75 and the motor 77 are both electrically connected to the controller 11.

[0053] After the mixing pipe 62 is installed, the telescopic end of the second electric push rod 75 is extended, which then pushes the fixing block 76 closer to the first assembly frame 331 and the second assembly frame 332. During this period, the connecting shaft 78 will extend into the circular groove. The triangular extension block 79 and the triangular limiting block 74 are close to each other, with one end being a pointed tip and the two sides being beveled. This can prevent the end faces of the triangular extension block 79 and the triangular limiting block 74 from abutting each other and thus preventing them from extending into the circular groove. After extension is complete, the motor 77 is started by the controller 11. The output shaft of the motor 77... The triangular extension block 79 rotates, and when the triangular extension block 79 comes into contact with the triangular limit block 74, it will drive the triangular limit block 74 to rotate, which in turn drives the disc 72 to rotate. The disc 72's rotating shaft 71 rotates, and the rotating shaft 71 ultimately drives several stirring shafts 73 to rotate. In this way, when the two types of glue enter the mixing tube 62, after being stirred by several stirring shafts 73, a new density glue is formed and flows out, resulting in better glue formation and better performance. When it is necessary to disassemble the mixing tube 62, the telescopic end of the second electric push rod 75 can be retracted.

[0054] The lifting mechanism 3, the sealing component 52, the two first electric slide rails 12, the second electric slide rail 14, the double tube glue applicator 61, and the mixing mechanism 7 are all electrically connected to the controller 11.

[0055] The device is used as follows:

[0056] In use, after opening the second assembly frame 332, install the mixing tube 62, fix one end of the mixing tube 42 to the connecting tube 53, then connect the two hoses 611 to the two connectors of the mixing tube 42, and then close the second assembly frame 332. When applying glue, place the three-phase copper busbars sequentially on the fixed mold 2, then start the second electric push rod 75, causing the second electric push rod 75 to drive the triangular extension block 79 into the circular groove. After starting the motor 77, the motor drives the disc 72 to rotate, and the disc 72 drives the rotating shaft to rotate. After starting the dual-tube glue applicator 61, the dual-tube glue applicator 61 will inject the two kinds of glue into the mixing tube 62 in a certain ratio. The stirring shaft 73 mixes the two types of adhesive. During this process, the temperature control component keeps the inside of the sealed cavity at a constant temperature, ensuring the adhesive maintains optimal fluidity. After the discharge needle 51 is moved to the designated position, the sealing component 521 is opened upwards. The dual-tube glue applicator 61 is continuously activated to discharge the mixed adhesive through the discharge needle 51. After one application, the first connecting tube 5 and the connecting tube 53 are resealed through the sealing component 521. The arrangement of the two first electric slide rails 12, the second electric slide rail 14, and the cylinder 32 allows the discharge needle 51 to move in multiple directions, making it highly adaptable. Furthermore, the discharged adhesive is thoroughly mixed, resulting in better glue quality and bonding effect.

[0057] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A glue injection tool for three-phase copper bars, characterized in that: include The base (1) has a controller (11) installed on the front side. The base (1) has a first electric slide rail (12) on both the left and right sides of the top. The two first electric slide rails (12) are slidably fitted with a U-shaped mounting bracket (13). The top of the U-shaped mounting bracket (13) has a second electric slide rail (14). The second electric slide rail (14) is slidably fitted with a slider (15). A fixed mold (2) is fixedly installed on the top of the base (1); Lifting mechanism (3), which is fixedly installed on the front side of slider (15); Assembly mechanism (4), which is fixedly installed on the lower front side of lifting mechanism (3); The first connecting tube (5) is fixedly installed at the bottom of the assembly mechanism (4). The bottom of the first connecting tube (5) is fixedly connected to a discharge needle (51). The first connecting tube (5) is provided with a sealing component (52) inside. The right side of the periphery of the first connecting tube (5) is fixedly connected to a connecting tube (53). Assembly block (6), the assembly block (6) is fixedly installed on the right side of the assembly mechanism (4), the front side of the assembly block (6) is inclinedly equipped with a double tube glue applicator (61), the two output ends of the double tube glue applicator (61) are connected to a mixing tube (62), one end of the mixing tube (62) is connected to one end of the connecting tube (53); A mixing mechanism (7) is fixedly installed inside the mixing tube (62); The lifting mechanism (3), sealing component (52), two first electric slide rails (12), second electric slide rail (14), double tube glue applicator (61) and mixing mechanism (7) are all electrically connected to the controller (11).

2. The glue-punching tool for three-phase copper bars according to claim 1, characterized in that: The lifting mechanism (3) includes a mounting box (31), which is fixedly installed on the front side of the slider (15). A cylinder (32) is fixedly installed on the bottom side inside the mounting box (31). The telescopic end of the cylinder (32) extends out of the mounting box (31) and is fixedly installed with a connecting block (33). A sliding groove (34) is provided on the front side of the connecting block (33). An adjusting block (35) is provided inside the sliding groove (34). A fixing component is provided between the adjusting block (35) and the sliding groove (34). The assembly mechanism (4) is fixedly installed on the front side of the adjusting block (35). The cylinder (32) is electrically connected to the controller (11).

3. The glue-punching tool for three-phase copper bars according to claim 2, characterized in that: The assembly mechanism (4) includes a U-shaped fitting (41), which is fixedly installed on the front side of the adjusting block (35). The bottom side of the U-shaped fitting (41) has an installation hole, and the first connecting pipe (5) is fixedly installed inside the installation hole.

4. The glue injection tool for three-phase copper bar according to claim 3, characterized in that: The sealing assembly (52) includes a sealing element (521), which is slidably and sealingly assembled inside the first connecting pipe (5). The sealing element (521) is provided with a connecting rod (522) at the top. The U-shaped fitting (41) is provided with a first electric push rod (523) at the top. The telescopic end of the first electric push rod (523) is fixedly connected to the connecting rod (522). The first electric push rod (523) is electrically connected to the controller (11).

5. The glue-punching tool for three-phase copper bars according to claim 4, characterized in that: The connecting block (33) is fixedly installed with a first assembly frame (331) on the front side. The first assembly frame (331) is hinged to a second assembly frame (332) on the front side. The first assembly frame (331) and the second assembly frame (332) are closed together to form a closed cavity. The closed cavity is provided with a temperature control component. The mixing tube (62) is located inside the closed cavity. A locking component is provided between the first assembly frame (331) and the second assembly frame (332). The temperature control component is electrically connected to the controller (11).

6. The glue-punching tool for three-phase copper bars according to claim 5, characterized in that: The temperature control component consists of two water-cooled cooling plates or two electrically controlled constant temperature plates.

7. The glue-punching tool for three-phase copper bars according to claim 6, characterized in that: The first assembly frame (331) and the second assembly frame (332) are both provided with assembly ports on the side away from the first connecting pipe (5). The mixing pipe (62) is symmetrically installed with feed pipes (621) on the right side of its periphery. Both feed pipes (621) are provided with connectors on their periphery. Both output ends of the double-pipe glue applicator (61) are provided with hoses (611). One end of each hose (611) is connected to one of the two connectors.

8. The glue-punching tool for three-phase copper bars according to claim 7, characterized in that: The mixing mechanism (7) includes a rotating shaft (71). A circular opening is provided at the end of the mixing tube (62) away from the first connecting tube (5). A disc (72) is rotatably mounted inside the circular opening. One end of the rotating shaft (71) is fixedly connected to the side of the disc (72) near the inside of the mixing tube (62). Several stirring shafts (73) are arranged around the circumference of the rotating shaft (71). A circular groove is provided on the side of the disc (72) away from the inside of the mixing tube (62). A triangular limiting block (74) is fixedly installed on the circumference of the inside of the circular groove. The dual-tube glue applicator (61) A second electric push rod (75) is fixedly installed on the side near the mixing pipe (62). A fixing block (76) is fixedly installed on the telescopic end of the second electric push rod (75). A motor (77) is fixedly installed on the side of the fixing block (76) away from the mixing pipe (62). The output shaft of the motor (77) passes through the fixing block (76) and is fixedly connected to a connecting shaft (78). One end of the connecting shaft (78) extends into a circular groove and a triangular extension block (79) is fixedly installed around its periphery. The second electric push rod (75) and the motor (77) are both electrically connected to the controller (11).

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