Deburring mechanism for radiator casting fins

Abstract

The invention discloses a radiator casting fin deburring mechanism, and relates to the technical field of fin deburring mechanisms, the radiator casting fin deburring mechanism comprises a working platform, and a first cutter and a second cutter deburr the two side faces of a radiator casting fin in the reciprocating sliding process; and a cutter III is arranged on the bottom surface of the assembly table between the cutter I and the cutter II, and is used for deburring the outer edge of the radiator casting fin. The angles of the first cutter and the second cutter are adjusted according to the spiral radians of different radiator casting fins, so that the abrasion degrees of cutting edges of the first cutter and the second cutter are the same in the deburring process, and the problem that the cutting edges are prone to being broken due to uneven abrasion is avoided. The multiple supporting plates can adapt to radiator fins with different diameters, the radiator fins are clamped to be matched with the outer shaft to rotate, the first cutter and the second cutter move in a reciprocating mode, so that burrs on the surfaces of the radiator fins and burrs on the end faces of the radiator fins can be removed, and the two side faces of the radiator fins can be subjected to deburring treatment.

Description

Technical Field

[0001] The invention relates to the technical field of fin deburring mechanisms, in particular to a fin deburring mechanism for a radiator casting. Background Art

[0002] The deep groove processing of the fins of the radiator die-casting is all done by CNC processing. After processing, burrs and burrs are easily generated on the side edges of the fins. The traditional removal method is to manually use a handheld burr knife to scrape the side edges of each fin in turn. The processing efficiency is low and it is easy to miss scraping.

[0003] Publication number "CN217433888U", titled "A Surface Deburring Device for Processing Heat Sinks", discloses a surface deburring device for processing heat sinks. When grinding is required, the heat sink body is placed on the operating table, and then the second cylinder is started. The piston rod of the second cylinder is pushed forward so that the two clamping plates can clamp and position the heat sink body. Then, according to the corresponding size, the grinding block is installed with bolts and plate frames. Start the motor, and the motor drives the half gear to rotate, so that it meshes and cooperates with the support tube to slide on the support rod, so that the grinding block can grind the heat sink body back and forth. It only grinds and deburrs the surface of the heat sink, but it is difficult to remove the burrs and burrs generated on the side edges of the heat sink. Summary of the invention

[0004] The purpose of the present invention is to provide a radiator casting fin deburring mechanism, which has a tool 1 and a tool 2 that adjust their angles according to the spiral curvature of different radiator casting fins, so that the cutting edges of tool 1 and tool 2 are subjected to the same degree of wear during the deburring process, thereby avoiding uneven wear of the cutting edges, which easily leads to the problem of broken cutting edges. Multiple support plates can not only adapt to radiator fins of different diameters, but also clamp the radiator fins and rotate with the outer shaft, and allow tool 1 and tool 2 to move back and forth to remove the surface burrs of the radiator fins, remove the burrs on the end faces of the radiator fins, and also deburr the two side surfaces of the radiator fins.

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

[0006] A fin deburring mechanism for a radiator casting, comprising:

[0007] A working platform, on which a fixture for clamping the fins of the radiator casting is mounted, wherein the fixture is driven to rotate by a motor;

[0008] The platform slide rail is installed on the working platform. A sliding frame is provided on the platform slide rail. The sliding frame slides back and forth along the platform slide rail.

[0009] An assembly table is provided on a sliding frame. On both sides of the assembly table, a first tool and a second tool are movably connected. During the reciprocating sliding process of the first tool and the second tool, deburring is performed on both side surfaces of the fins of the radiator casting.

[0010] A third tool is provided on the bottom surface of the assembly table between the first tool and the second tool. Among them, the third tool is used for deburring the outer edge of the fins of the radiator casting.

[0011] As an alternative embodiment, two sets of jigs are provided. The bottoms of the jigs are both connected to the sliding frame, and the two sets of jigs slide along the slide rails of the upper platform slide rails on the working platform.

[0012] As an alternative embodiment, each set of jigs includes a bracket, a side frame, an outer shaft, an inner shaft, a connecting rod, a sliding sleeve, and a support plate. The bracket is penetrated by the outer shaft. One end of the outer shaft on both sides of the side frame is connected to a first motor through bevel gears, and the side frame is fixed on the outer shaft.

[0013] The inner shaft penetrates the outer shaft. One end of the inner shaft is connected to a second motor. The thread on the inner shaft is threadedly connected to the sliding sleeve. The sliding sleeve also sleeves on the outer shaft, and the outer wall of the sliding sleeve is connected to the support plate through a connecting rod.

[0014] As an alternative embodiment, a clamping block is provided at the port of the support plate, and the clamping block is stuck in a sliding groove opened on the side frame.

[0015] As an alternative embodiment, not less than three support plates are provided. Two connecting rods hinged at the bottom end of each support plate rotate around a strip-shaped block on the outer peripheral surface of the sliding sleeve.

[0016] As an alternative embodiment, the first tool and the second tool are symmetrically arranged on both sides of the assembly table. Two third tools are provided. The third tools are both connected to the first tool and the second tool, and form a first L-shaped blade and a second L-shaped blade. And the bent part of the first L-shaped blade and the second L-shaped blade is a rounded blade.

[0017] As an alternative embodiment, the cutting edges of the first L-shaped blade and the second L-shaped blade are in opposite directions.

[0018] As an alternative embodiment, the cutting edges of the first tool and the second tool face each other, and the third tool is located between the first tool and the second tool.

[0019] As an alternative embodiment, the first tool and the second tool are connected to a lifting component on the assembly table, and the lifting component is used to control the staggered lifting of the first tool and the second tool.

[0020] As an alternative embodiment, the lifting component includes a sliding plate, a middle frame, and a transmission component. Two sets of transmission components are provided and are respectively connected to the first tool and the second tool. The middle frame is installed on the assembly table. The sliding plate is driven by a cylinder to slide reciprocally on the top surface of the assembly table, and an arc-shaped groove is opened on the sliding plate.

[0021] Each set of transmission components includes a first transmission rod and a second transmission rod. A sliding rod connected to one end of the first transmission rod is inserted into the arc-shaped groove, and a strip-shaped groove opened at the other end of the first transmission rod is inserted by one end rod body of the second transmission rod. The second transmission rod rotates around the middle frame, and the two second transmission rods are respectively movably connected to the telescopic structures of the first tool and the second tool.

[0022] The technical effects and advantages of the present invention are as follows:

[0023] 1. The first tool and the second tool adjust their angles according to the spiral radian of the fins of different radiator castings, so that the wear degrees of the cutting edges of the first tool and the second tool are the same during the deburring process, avoiding uneven wear of the cutting edges, resulting in fast wear on one side of the first tool and the second tool in contact with the fins of the radiator casting and slow wear on the other side, thus easily causing the problem of tool breakage.

[0024] 2. Multiple support plates move synchronously in the radial direction, the support plates expand and contract to adjust the diameter of the supporting member composed of multiple support plates, which can not only adapt to radiator fins of different diameters, but also clamp the radiator fins. Cooperating with the rotation of the outer shaft, the purpose of rotating the radiator fins can be achieved, and the surface burrs of the radiator fins can be removed by reciprocating movement of the first tool and the second tool. It can not only remove the burrs on the end faces of the radiator fins, but also deburr the two side faces of the radiator fins. Description of the Drawings

[0025] Figure 1 It is the overall structure diagram of the present invention;

[0026] Figure 2 It is the left view of the fixture for jacking up the fins of the present invention;

[0027] Figure 3 It is the right view of the fixture for jacking up the fins of the present invention;

[0028] Figure 4 It is the fixture structure diagram of the present invention;

[0029] Figure 5 It is the fixture exploded view of the present invention;

[0030] Figure 6 It is the connection diagram of the assembly table and the tool of the present invention;

[0031] Figure 7 It is the connection diagram of the assembly table and the tool of the second embodiment of the present invention;

[0032] Figure 8 It is the lifting component structure diagram of the present invention;

[0033] Figure 9 It is the arc-shaped groove structure diagram of the present invention.

[0034] In the figure:

[0035] 1. Working platform;

[0036] 2. Fixture; 21. Bracket; 22. Side frame; 23. Outer shaft; 24. Inner shaft; 25. Connecting rod; 26. Sliding sleeve; 27. Support plate;

[0037] 3. Platform slide rail;

[0038] 4. Sliding frame;

[0039] 5. Assembly table; 51. Tool 1; 52. Tool 2; 53. Tool 3;

[0040] 6. Lifting assembly; 61. Slide plate; 611. Arc groove; 62. Middle frame; 63. Transmission rod 1; 64. Transmission rod 2. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0042] Refer to Figures 1 - 6 , a deburring mechanism for fins of a radiator casting, including:

[0043] A working platform 1, on which a fixture 2 for clamping the fins of the radiator casting is assembled. Among them, the fixture 2 is driven by a motor to rotate, and both ends of the fins of the radiator casting are clamped by the fixture 2, so as to achieve the purpose of limiting and fixing both ends;

[0044] The fixture 2 can also slide along the working platform 1. When it is necessary to clamp the fins of the radiator casting, the two fixtures 2 move in opposite directions. When the distance between the two fixtures 2 is greater than the length of the fins of the radiator casting, one end of the fins of the radiator casting is first sleeved on one of the fixtures 2, and then the other fixture 2 is moved to insert the other end of the fins of the radiator casting, so as to clamp both ends of the fins of the radiator casting, and cooperate with the motor to drive the fins of the radiator casting to rotate.

[0045] A platform slide rail 3, which is installed on the working platform 1, and a sliding sliding frame 4 is arranged on the platform slide rail 3, and the sliding frame 4 reciprocates along the length direction of the platform slide rail 3;

[0046] The connection method between the sliding frame 4 and the platform slide rail 3 is not limited to structures such as lead screws and linear slide rails;

[0047] An assembly table 5 is arranged on the sliding frame 4. On both sides of the assembly table 5, a first tool 51 and a second tool 52 are movably connected. During the reciprocating sliding process, the first tool 51 and the second tool 52 deburr the two side surfaces of the fins of the radiator casting.

[0048] The assembly table 5 is assembled on the sliding frame 4 through bolts. The angles of the first tool 51 and the second tool 52 are adjustable, and at the same time, the angles of the first tool 51 and the second tool 52 are the same. The first tool 51 and the second tool 52 adjust their angles according to the spiral radian of the fins of different radiator castings, so that the included angle between the angle directions of the first tool 51 and the second tool 52 and the side surface of the fins of the radiator casting is equal to 90°. In this way, the wear degrees of the cutting edges of the first tool 51 and the second tool 52 during the deburring process are the same, avoiding the included angle between the fins of the radiator casting with different helix degrees and the first tool 51 and the second tool 52 being an acute angle or an obtuse angle. When the fins of the radiator casting contact the first tool 51 and the second tool 52 at an acute angle or an obtuse angle, the cutting edges wear unevenly, resulting in the side of the first tool 51 and the second tool 52 that contacts the fins of the radiator casting wearing fast and the other side wearing slowly. Then, it is easy to grind the cutting edges of the first tool 51 and the second tool 52 thin, which is prone to the problem of broken cutting edges. The flying thin cutting edges are also easy to cause danger. Through the adjustable-angle first tool 51 and second tool 52, they can adapt to different fins of radiator castings, making the wear degrees of the cutting edges of the first tool 51 and the second tool 52 almost the same, only making the cutting edges coarser and coarser, avoiding the problem of broken cutting edges, and the danger level also decreases after the cutting edges become coarser.

[0049] A third tool 53 is arranged on the bottom surface of the assembly table 5 between the first tool 51 and the second tool 52. Among them, the third tool 53 is used to deburr the outer edge of the fins of the radiator casting.

[0050] Through the arranged first tool 51, second tool 52 and third tool 53, the three end faces of the fins of the radiator casting are all deburred, making the burrs of the fins of the radiator casting removed more thoroughly.

[0051] Two sets of jigs 2 are arranged. The bottoms of the jigs 2 are both connected to the sliding frame 4. The two sets of jigs 2 slide along the slide rails of the upper platform slide rails 3 on the working platform 1.

[0052] Each set of jigs 2 includes a bracket 21, a side frame 22, an outer shaft 23, an inner shaft 24, a connecting rod 25, a sliding sleeve 26 and a supporting plate 27. The bracket 21 is penetrated by the outer shaft 23. One ends of the outer shaft 23 on both sides of the bracket 21 are connected to a first motor through bevel gears. A sliding sleeve 26 and a fixed side frame 22 are sleeved on the other end of the outer shaft 23.

[0053] The inner shaft 24 penetrates the outer shaft 23. One end of the inner shaft 24 is connected to a second motor. The thread on the inner shaft 24 is threadedly connected to the sliding sleeve 26. The outer wall of the sliding sleeve 26 is connected to the supporting plate 27 through the connecting rod 25.

[0054] A clamping block is provided at the port of the support plate 27, and the clamping block is stuck in the sliding groove opened on the side frame 22.

[0055] At least three support plates 27 are provided. Two connecting rods 25 hinged to the bottom end of each support plate 27 rotate around the strip-shaped block on the outer peripheral surface of the sliding sleeve 26.

[0056] The bracket 21 is assembled on the sliding rail of the working platform 1 and is used to drive the bracket 21 to slide to adjust the position of the fixture 2. The outer shaft 23 passes through the bracket 21 and the outer shaft 23 can rotate around the bracket 21. Among them, the inner shaft 24 passes through the outer shaft 23, and the inner shaft 24 is also limited by the support member on the working platform 1. During the process of the second motor driving the inner shaft 24 to rotate, the outer shaft 23 does not rotate. When the inner shaft 24 rotates, it will drive the sliding sleeve 26 to move along the outer shaft 23. During the movement of the sliding sleeve 26, the sliding sleeve 26 will drive the connecting rod 25 to move, and the movement of the connecting rod 25 will drive the support plate 27 to move along the sliding groove of the side frame 22, realizing the synchronous radial movement of multiple support plates 27, so as to realize the expansion and retraction of the support plates 27, so as to realize the adjustment of the diameter of the support member composed of multiple support plates 27, which can not only adapt to radiator fins of different diameters, but also clamp the radiator fins. Cooperating with the rotation of the outer shaft 23, the purpose of rotating the radiator fins can be achieved.

[0057] The first tool 51 and the second tool 52 are symmetrically arranged on both sides of the assembly table 5. Two third tools 53 are provided. The third tools 53 are both connected to the first tool 51 and the second tool 52, and form a first L-shaped blade and a second L-shaped blade, and the bent parts of the first L-shaped blade and the second L-shaped blade are rounded blades. The cutting edge directions of the first L-shaped blade and the second L-shaped blade are opposite.

[0058] During the rotation of the radiator fins, the cutting edges of the first tool 51 and the second tool 52 face the radiator fins. When the radiator fins rotate, the first tool 51 first contacts one side surface of the radiator fins, and at the same time the third tool 53 contacts the end surface of the radiator fins. During the rotation of the radiator fins, the first tool 51 and the second tool 52 also move continuously to keep the state that the first tool 51 is always in contact with the side surface of the radiator fins. After the first tool 51 moves away from the radiator fins, the radiator fins are rotated in the reverse direction, and at the same time the first tool 51 and the second tool 52 move in the reverse direction. The cutting edge of the second tool 52 contacts the other side surface of the radiator fins to deburr the other side surface of the radiator fins. At the same time, the third tool 53 continues to deburr the end surface of the radiator fins to make the end surface of the radiator fins smoother. The radiator fins keep rotating and the first tool 51 and the second tool 52 reciprocate to remove the surface burrs of the radiator fins, which can not only remove the burrs on the end surface of the radiator fins, but also deburr the two side surfaces of the radiator fins.

[0059] Embodiment 2: Please refer to Figures 7 - 9, This embodiment is different from Embodiment 1. The cutting tool 1 51 and the cutting tool 2 52 in this embodiment adopt an opposite cutting edge structure, and the cutting tool 3 53 is located between the cutting tool 1 51 and the cutting tool 2 52. The cutting tool 1 51 and the cutting tool 2 52 are connected to the lifting component 6 on the assembly table 5, and the lifting component 6 is used to control the staggered lifting of the cutting tool 1 51 and the cutting tool 2 52.

[0060] The lifting component 6 includes a sliding plate 61, a middle frame 62 and a transmission component. The transmission component is provided in two groups and is respectively connected to the cutting tool 1 51 and the cutting tool 2 52. The middle frame 62 is installed on the assembly table 5. The sliding plate 61 is driven by a cylinder to reciprocate on the top surface of the assembly table 5. An arc-shaped groove 611 is provided on the sliding plate 61; the arc-shaped groove 611 has a structure with a middle bulge and two ends concave.

[0061] Each group of transmission components includes a first transmission rod 63 and a second transmission rod 64. The sliding rod connected to one end of the first transmission rod 63 is inserted into the arc-shaped groove 611. One end rod body of the second transmission rod 64 is inserted into the strip-shaped groove provided at the other end of the first transmission rod 63. The second transmission rod 64 rotates around the middle frame 62. The two second transmission rods 64 are respectively connected to the telescopic structures on the cutting tool 1 51 and the cutting tool 2 52. The cutting tool 1 51 and the cutting tool 2 52 can rotate around the telescopic structures to adjust the angles of the cutting tool 1 51 and the cutting tool 2 52 to keep perpendicular to the side surface of the radiator fin. And there are two cutting tools 3 53, which are respectively movably connected to the assembly table 5. The side surfaces of the cutting tools 3 53 are respectively abutted against the cutting tool 1 51 and the cutting tool 2 52, and can drive the cutting tools 3 53 to rotate during the rotation of the cutting tool 1 51 and the cutting tool 2 52.

[0062] During the process of the sliding plate 61 being pushed by the cylinder, the sliding plate 61 can make a reciprocating movement. When the cutting tool 1 51 and the cutting tool 2 52 move, when the sliding plate 61 moves, the first transmission rod 63 of the transmission component connected to the cutting tool 2 52 moves to the protruding position of the arc-shaped groove 611, and the first transmission rod 63 of the transmission component of the cutting tool 1 51 moves to the concave position of the arc-shaped groove 611. Thus, the two groups of transmission components perform staggered actions, pushing the respective connected second transmission rods 64 to rotate around the middle frame 62, realizing the cutting tool 1 51 descending and the cutting tool 2 52 ascending. Through the above operations, during the rotation of the radiator fin, the cutting tool 1 51 descends to contact one side surface of the radiator fin, while the height that the cutting tool 2 52 ascends exceeds the height of the radiator fin, and the cutting tool 2 52 will not contact the radiator fin during the movement. After the cutting tool 1 51 finishes removing the burrs on one side surface of the radiator fin, the cutting tool 1 51 and the cutting tool 2 52 move in the reverse direction. At this time, the first transmission rod 63 connected to the cutting tool 2 52 moves to the concave position of the arc-shaped groove 611, and the first transmission rod 63 connected to the cutting tool 1 51 moves to the protruding position of the arc-shaped groove 611. At this time, the cutting tool 2 52 ascends and the cutting tool 2 52 descends, and the cutting tool 1 51 will not collide with the radiator fin. After the cutting tool 2 52 contacts the other side of the radiator fin, the burrs are removed.

[0063] Forward stroke of three-sided synchronous deburring:

[0064] Tool 1 (51) descends to contact one side of the radiator fin, and tool 3 (53) scrapes the burrs on the end face of the radiator fin while cooperating with tool 2 (52) to lift and avoid the other side of the radiator fin.

[0065] Reverse stroke of three-sided synchronous deburring:

[0066] Tool 1 (51) lifts and disengages, tool 2 (52) descends to contact the other side of the radiator fin; tool 3 (53) continues to scrape the end face. A single round trip completes the processing of both sides and the end face, with the efficiency increased by 3 times.

[0067] Clamping stage: The dual-axis drive of fixture 2 and the telescopic mechanism of 27 break through the dimensional limitations. The three-sided coordinated cutting of the L-shaped tool group is combined with intelligent lifting and avoidance, taking into account both efficiency and safety; Life management: The strategy of vertical contact of the cutting edge fundamentally eliminates the risk of tool breakage.

[0068] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A deburring mechanism for the fins of a radiator casting, characterized in that, Including: A working platform (1) is equipped with a fixture (2) for clamping the fins of a radiator casting. Among them, the fixture (2) is driven by a motor to rotate; A platform slide rail (3) is installed on the working platform (1). A sliding frame (4) is arranged on the platform slide rail (3), and the sliding frame (4) reciprocates along the platform slide rail (3); An assembly table (5) is arranged on the sliding frame (4). A first cutter (51) and a second cutter (52) are movably connected to both sides of the assembly table (5). The first cutter (51) and the second cutter (52) deburr the two side surfaces of the fins of the radiator casting during the reciprocating sliding process; A third cutter (53) is arranged on the bottom surface of the assembly table (5) between the first cutter (51) and the second cutter (52). Among them, the third cutter (53) is used to deburr the outer edge of the fins of the radiator casting.

2. The deburring mechanism for the fins of the radiator casting according to claim 1, characterized in that, Two sets of the fixtures (2) are provided, and the bottoms of the fixtures (2) are both connected to the sliding frame (4). The two sets of fixtures (2) slide along the slide rail of the platform slide rail (3) on the working platform (1).

3. A deburring mechanism for the fins of a radiator casting according to claim 2, characterized in that, Each set of the fixtures (2) includes a bracket (21), a side frame (22), an outer shaft (23), an inner shaft (24), a connecting rod (25), a sliding sleeve (26), and a supporting plate (27). The bracket (21) is penetrated by the outer shaft (23). One end of the outer shaft (23) on both sides of the bracket (21) is connected to a motor one through bevel gears. A sliding sleeve (26) and a fixed side frame (22) are sleeved on the other end of the outer shaft (23); The inner shaft (24) penetrates the outer shaft (23). One end of the inner shaft (24) is connected to a motor two. The thread on the inner shaft (24) is threadedly connected to the sliding sleeve (26). The outer wall of the sliding sleeve (26) is connected to the supporting plate (27) through a connecting rod (25).

4. A deburring mechanism for the fins of a radiator casting according to claim 3, characterized in that, A clamping block is arranged at the port of the supporting plate (27), and the clamping block is stuck in the chute opened on the side frame (22).

5. A deburring mechanism for radiator casting fins according to claim 4, characterized in that, No less than three supporting plates (27) are provided. Two connecting rods (25) hinged at the bottom end of each supporting plate (27) rotate around the strip-shaped block on the outer peripheral surface of the sliding sleeve (26).

6. A deburring mechanism for the fins of a radiator casting according to claim 5, characterized in that, The first cutter (51) and the second cutter (52) are symmetrically arranged on both sides of the assembly table (5). Two third cutters (53) are provided. The third cutters (53) are both connected to the first cutter (51) and the second cutter (52), and form a first L-shaped blade and a second L-shaped blade. And the bent part of the first L-shaped blade and the second L-shaped blade is a rounded blade.

7. A deburring mechanism for the fins of a radiator casting according to claim 6, characterized in that, The cutting edges of the first L-shaped blade and the second L-shaped blade are in opposite directions.

8. A deburring mechanism for the fins of a radiator casting according to claim 5, characterized in that, The cutting edges of the first cutter (51) and the second cutter (52) are opposite to each other, and the third cutter (53) is located between the first cutter (51) and the second cutter (52).

9. A deburring mechanism for the fins of a radiator casting according to claim 8, characterized in that, The first cutter (51) and the second cutter (52) are connected to a lifting component (6) on the assembly table (5). The lifting component (6) is used to control the staggered lifting of the first cutter (51) and the second cutter (52).

10. A deburring mechanism for the fins of a radiator casting according to claim 9, characterized in that, The lifting assembly (6) includes a sliding plate (61), a middle frame (62) and a transmission component. The transmission component is provided in two groups and is respectively connected to the first cutter (51) and the second cutter (52). The middle frame (62) is installed on the assembly table (5). The sliding plate (61) is driven by a cylinder to reciprocate on the top surface of the assembly table (5). An arc-shaped groove (611) is formed in the sliding plate (61). Each group of transmission components includes a first transmission rod (63) and a second transmission rod (64). A sliding rod connected to one end of the first transmission rod (63) is inserted into the arc-shaped groove (611). One end of the second transmission rod (64) is inserted into a strip-shaped groove formed in the other end of the first transmission rod (63). The second transmission rod (64) rotates around the middle frame (62). The two second transmission rods (64) are respectively movably connected to the telescopic structures of the first cutter (51) and the second cutter (52).

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