Shearing apparatus for facilitating the positioning of cuts

Abstract

The utility model belongs to fire fighting equipment technical field especially relates to a kind of shearing equipment convenient to position cutting, including cutting mechanism and positioning mechanism, the cutting mechanism is used to cut target object;The positioning mechanism is slidably connected with the cutting mechanism;Wherein, the positioning mechanism is provided with positioning guide slot, the cutting mechanism is slidably connected in the positioning guide slot;The cutting mechanism is provided with cutting position;When target object moves to cutting position, the positioning end of the positioning mechanism can be positioned and clamped target object before the cutting mechanism, and the output end of the cutting mechanism is then acted on target object and cuts target object off.The working sequence of first fixing and then shearing completely eliminates the skidding phenomenon from the source, and converts the shearing force into effective cutting efficiency.The final realization of one-time accurate cutting in the scene of hard object shearing greatly reduces the risk of operation out of control, and guarantees the efficiency of rescue.

Description

Technical Field

[0001] This utility model belongs to the field of fire protection equipment technology, and in particular relates to a shearing device that facilitates positioning and cutting. Background Technology

[0002] Cutting equipment commonly used in firefighting generally employs a scissor-like structure design based on the lever principle. Its core cutting end consists of two intersecting blades connected by a pivot. The force applied by the operating handle drives the two blades to rotate relative to each other, thus achieving the cutting operation on the target object. This design is relatively simple, can generate significant shearing force, and is widely used in firefighting and demolition scenarios.

[0003] However, such devices have significant shortcomings when cutting hard objects. Because their shearing ends consist of relatively independent blades, during the application of force, especially when encountering significant resistance or high material hardness, the two blades are prone to relative lateral displacement or overall wobbling. This structural instability can cause the blades to fail to precisely engage the target object during shearing, or even slip or deviate, reducing not only shearing efficiency and effectiveness but also potentially increasing operational difficulty and safety risks, thus hindering the smooth progress of rescue operations. Utility Model Content

[0004] The purpose of this invention is to provide a shearing device that facilitates positioning and cutting, aiming to solve the technical problem that existing shearing devices lack positioning auxiliary structures, and when encountering greater resistance or high material hardness, the two blades are prone to relative lateral displacement or overall shaking, resulting in the blades being unable to accurately engage with the target object during the shearing process.

[0005] To achieve the above objectives, this utility model provides a shearing device for easy positioning and cutting, comprising a cutting mechanism and a positioning mechanism. The cutting mechanism is used to cut the target object; the positioning mechanism is slidably connected to the cutting mechanism; wherein, the positioning mechanism is provided with a positioning guide groove, and the cutting mechanism is slidably connected within the positioning guide groove; the cutting mechanism is provided with a cutting position; when the target object moves to the cutting position, the positioning end of the positioning mechanism can position and clamp the target object before the cutting mechanism, and then the output end of the cutting mechanism acts on the target object and cuts it.

[0006] Optionally, the cutting mechanism includes a first cutter and a second cutter symmetrically distributed, one end of the first cutter and the second cutter being rotatably connected, the free ends of the first cutter and the second cutter rotating in opposite directions, and the free ends of the first cutter and the second cutter being slidably connected to the positioning mechanism.

[0007] Optionally, the positioning mechanism includes a guide shaft, a first guide seat, and a second guide seat. The first guide seat and the second guide seat are spaced apart along a straight line. The free end of the first cutter is slidably connected to the first guide seat, and the second cutter is slidably connected to the second guide seat. The first guide seat and the second guide seat are symmetrically slidably connected to both ends of the guide shaft.

[0008] Optionally, the first cutter includes a first connecting seat, a first cutting head, and a first guide wheel. The positioning mechanism is provided with a first guide groove. The first guide wheel is rotatably connected to the end of the first connecting seat. The first cutting head is disposed on the first connecting seat. The first connecting seat is slidably connected in the positioning guide groove, and the first guide wheel is slidably connected in the first guide groove. The second cutter includes a second connecting seat, a second cutting head, and a second guide wheel. The positioning mechanism is provided with a second guide groove. The second guide wheel is rotatably connected to the end of the second connecting seat. The second cutting head is disposed on the second connecting seat. The second connecting seat is slidably connected in the positioning guide groove, and the second guide wheel is slidably connected in the second guide groove. The ends of the first connecting seat and the second connecting seat are rotatably connected.

[0009] Optionally, the first guide groove and the second guide groove are arranged in an arc-shaped path, and the first guide groove and the second guide groove are respectively concentrically arranged with the moving paths of the first guide wheel and the second guide wheel.

[0010] Optionally, the first guide seat has an inverted U-shaped cross-section, a first groove is provided inside the first guide seat, the first cutter is slidably connected inside the first groove, and the first cutter is slidably abutting against the inner wall of the first groove; the second guide seat has an inverted U-shaped cross-section, a second groove is provided inside the second guide seat, the second cutter is slidably connected inside the second groove, and the second cutter is slidably abutting against the inner wall of the second groove.

[0011] Optionally, the first guide seat has an inverted U-shaped cross-section, a first groove is provided inside the first guide seat, the first cutter is slidably connected inside the first groove, and the first cutter is slidably abutting against the inner wall of the first groove; the second guide seat has an inverted U-shaped cross-section, a second groove is provided inside the second guide seat, the second cutter is slidably connected inside the second groove, and the second cutter is slidably abutting against the inner wall of the second groove.

[0012] Optionally, there are two sets of guide shafts, and two sets of both the first guide seat and the second guide seat. The two sets of guide shafts are symmetrically distributed on both sides of the first guide seat and the second guide seat. The two sets of first guide seats and the two sets of second guide seats are slidably connected to the corresponding guide shafts.

[0013] Optionally, the positioning mechanism further includes a drive source, the output end of which is drivenly connected to the first guide seat and the second guide seat, and the drive source is used to drive the first guide seat and the second guide seat to move closer or separate.

[0014] Optionally, the drive source includes a first drive shaft and a second drive shaft. The first guide seat and the second guide seat are respectively provided with a first drive groove and a second drive groove. The end of the first drive shaft is slidably connected in the first drive groove, and the end of the second drive shaft is slidably connected in the second drive groove. The first drive groove and the second drive groove are symmetrically distributed in the horizontal direction and are arranged in an inclined direction. The end of the first drive groove near the first cutter is inclined towards the guide shaft, and the end of the second drive groove near the second cutter is inclined towards the guide shaft.

[0015] The above-mentioned technical solutions of the easy-to-position cutting shearing device provided in this utility model embodiment have at least one of the following technical effects: the shearing stability is significantly improved through the synergistic effect of the positioning mechanism and the cutting mechanism: when the target object enters the cutting position, the positioning mechanism first clamps and fixes it through the positioning end, eliminating the risk of object shaking; then the cutting mechanism slides along the preset positioning guide groove, so that the blade body is precisely closed under the guidance of the rigid track. This step-by-step action completely overcomes the biting offset problem caused by the lateral displacement of the independent blade of traditional lever-type scissors - the guide groove forcibly constrains the movement trajectory of the blade body, ensuring that the blade always acts perpendicularly on the force-bearing surface of the target object; and the working sequence of fixing before cutting eliminates the slippage phenomenon from the root, so that the shearing force is completely converted into effective cutting efficiency. Finally, in the scenario of shearing hard objects, a one-time precise cut is achieved, greatly reducing the risk of loss of control during operation and ensuring rescue efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of the structure of a shearing device for easy positioning and cutting provided in an embodiment of the present invention.

[0018] Figure 2 for Figure 1 A cross-sectional diagram of a shearing device for easy positioning and cutting.

[0019] Figure 3 This is a front sectional view of a shearing device for easy positioning and cutting provided in an embodiment of the present invention.

[0020] The following are the labeling elements in the figure: 100—Cutting mechanism; 200—Positioning mechanism; 300—Positioning guide groove 110—First cutter; 120—Second cutter; 210—First guide seat 220—Second guide seat; 230—Guide shaft; 111—First connecting seat 112—First cutter head; 113—First guide wheel; 240—First guide groove 250—Second guide groove; 121—Second connecting seat; 122—Second cutter head 123—Second guide wheel; 211—First slide groove; 221—Second slide groove 261—First drive shaft; 262—Second drive shaft; 263—First drive groove 264—Second drive slot. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The following description is based on the accompanying drawings. Figures 1-3 The described embodiments are exemplary and intended to explain embodiments of the present invention, and should not be construed as limiting the present invention.

[0022] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0025] In one embodiment of this utility model, such as Figures 1-3 As shown, a cutting device for easy positioning and cutting is provided, including a cutting mechanism 100 and a positioning mechanism 200. The cutting mechanism 100 is used to cut the target object; the positioning mechanism 200 is slidably connected to the cutting mechanism 100; wherein, the positioning mechanism 200 is provided with a positioning guide groove 300, and the cutting mechanism 100 is slidably connected in the positioning guide groove 300; the cutting mechanism 100 is provided with a cutting position; when the target object moves to the cutting position, the positioning end of the positioning mechanism 200 can position and clamp the target object before the cutting mechanism 100, and then the output end of the cutting mechanism 100 acts on the target object and cuts it.

[0026] Specifically, the synergistic effect of the positioning mechanism 200 and the cutting mechanism 100 significantly improves cutting stability: when the target object enters the cutting position, the positioning mechanism 200 first clamps and fixes it through the positioning end, eliminating the risk of object swaying; then the cutting mechanism 100 slides along the preset positioning guide groove 300, allowing the blade to close precisely under the guidance of the rigid track. This step-by-step action completely overcomes the biting offset problem caused by the lateral displacement of the independent blades in traditional lever-type scissors—the guide groove forcibly constrains the movement trajectory of the blade, ensuring that the blade always acts perpendicularly on the force-bearing surface of the target object; and the working sequence of fixing before cutting eliminates slippage at the source, allowing the shearing force to be completely converted into effective cutting efficiency. Ultimately, it achieves one-time precise cutting in the scenario of cutting hard objects, greatly reducing the risk of operational loss of control and ensuring rescue efficiency.

[0027] like Figures 1-3As shown, in another embodiment of the present invention, the cutting mechanism 100 includes a first cutter 110 and a second cutter 120 symmetrically distributed. One end of the first cutter 110 and the second cutter 120 are rotatably connected. The free ends of the first cutter 110 and the second cutter 120 rotate in opposite directions. The free ends of the first cutter 110 and the second cutter 120 are slidably connected to the positioning mechanism 200.

[0028] During operation, the first cutter 110 and the second cutter 120 rotate relative to each other around their rotational connection point, while their free ends slide in opposite directions under the constraint of the positioning mechanism 200. This design, based on the lever principle and incorporating sliding guidance, not only generates a strong biting force during the cutting process, but also strictly restricts their movement trajectory, effectively preventing lateral misalignment or twisting of the cutters under resistance, and significantly improving the stability of the cutting action and the precision of the blade engagement.

[0029] In another embodiment of the present invention, the positioning mechanism 200 includes a guide shaft 230, a first guide seat 210 and a second guide seat 220. The first guide seat 210 and the second guide seat 220 are spaced apart along a straight line. The free end of the first cutter 110 is slidably connected to the first guide seat 210, and the second cutter 120 is slidably connected to the second guide seat 220. The first guide seat 210 and the second guide seat 220 are symmetrically slidably connected at both ends of the guide shaft 230.

[0030] The first guide seat 210 and the second guide seat 220 can slide synchronously towards or away from each other along the guide shaft 230. The guide shaft 230 provides a stable linear reference for the entire positioning mechanism 200, ensuring that the first guide seat 210 and the second guide seat 220 always move along a predetermined straight path, fundamentally eliminating the possibility of the cutter shifting or wobbling, and establishing a solid foundation for precise cutting.

[0031] like Figures 1-3As shown, in another embodiment of this utility model, the first cutter 110 includes a first connecting seat 111, a first cutting head 112, and a first guide wheel 113. The positioning mechanism 200 is provided with a first guide groove 240. The first guide wheel is rotatably connected to the end of the first connecting seat 111. The first cutting head 112 is disposed on the first connecting seat 111. The first connecting seat 111 is slidably connected in the positioning guide groove 300. The first guide wheel 113 is slidably connected in the first guide groove 240. The second cutter 120 includes a second connecting seat 121, a second cutting head 122, and a second guide wheel 123. The positioning mechanism 200 is provided with a second guide groove 250. The second guide wheel 123 is rotatably connected to the end of the second connecting seat 121. The second cutting head 122 is disposed on the second connecting seat 121. The second connecting seat 121 is slidably connected in the positioning guide groove 300. The second guide wheel 123 is slidably connected in the second guide groove 250. The ends of the first connecting seat 111 and the second connecting seat 121 are rotatably connected.

[0032] like Figures 1-3 As shown, the first connecting seat 111 and the second connecting seat 121 slide within the positioning guide groove 300, while the first guide wheel 113 and the second guide wheel 123 on them roll within the first guide groove 240 and the second guide groove 250, respectively. This dual guiding mechanism (the positioning guide groove 300 constrains the basic path of the connecting seat, and the guide groove precisely controls the movement trajectory of the cutter head through the guide wheels) provides combined guidance for the movement of the first cutter head 112 and the second cutter head 122. The shape of the guide groove determines the angle and path of the cutter head when it cuts into the target object, ensuring that the blade acts on the target object with the optimal angle and perpendicular force, maximizing cutting efficiency and preventing slippage or chipping due to angle deviation.

[0033] like Figures 1-3 As shown, in another embodiment of the present invention, the first guide groove 240 and the second guide groove 250 are arranged in an arc-shaped path, and the first guide groove 240 and the second guide groove 250 are respectively concentrically arranged with the moving paths of the first guide wheel 113 and the second guide wheel 123.

[0034] The arc-shaped first guide groove 240 and second guide groove 250 guide the first guide wheel 113 and the second guide wheel 123 to move along a specific curve. Because the guide grooves and the guide wheel movement paths are concentric, this ensures that when the guide wheels roll along the guide grooves, the first cutter head 112 and the second cutter head 122 can perform coordinated arc movements around a fixed virtual center point. This design allows the two cutter heads to maintain the optimal relative position and cutting angle during the cutting process, as if rotating around a stable center point, greatly enhancing the coordination, stability, and smoothness of the cutting action, making it particularly suitable for cutting circular objects or objects requiring rotational cutting.

[0035] like Figures 1-3 As shown, in another embodiment of this utility model, the first guide seat 210 has a U-shaped cross-section, and a first groove 211 is provided inside the first guide seat 210. The first cutter 110 is slidably connected inside the first groove 211, and the first cutter 110 slides and abuts against the inner wall of the first groove 211. The second guide seat 220 has a U-shaped cross-section, and a second groove 221 is provided inside the second guide seat 220. The second cutter 120 is slidably connected inside the second groove 221, and the second cutter 120 slides and abuts against the inner wall of the second groove 221. In this embodiment, the first groove 211 and the second groove 221 form the positioning guide groove 300. The first guide seat 210 and the second guide seat 220, shaped like the letter C, form a wrap-around first groove 211 and a second groove 221. The free ends of the first cutter 110 and the second cutter 120 are respectively embedded in the corresponding grooves, with their sidewalls in close sliding contact with the inner walls of the grooves. The wrap-around structure provides all-round rigid support and constraint for the free ends of the cutters, bearing and counteracting any forces that attempt to cause lateral displacement, torsion, or tilting of the blade during the cutting process, firmly restricting the blade to a predetermined straight path, completely eliminating the problem of independent wobbling of traditional scissors, ensuring effective transmission of cutting force and precise alignment of the blade edge.

[0036] like Figures 1-3 As shown, in another embodiment of this utility model, there are two sets of guide shafts 230, and two sets of first guide seats 210 and two sets of second guide seats 220. The two sets of guide shafts 230 are symmetrically distributed on both sides of the first guide seat 210 and the second guide seat 220. The two sets of first guide seats 210 and the two sets of second guide seats 220 are respectively slidably connected to the corresponding guide shafts 230.

[0037] Two sets of symmetrically distributed guide shafts 230 support two sets of first guide seats 210 and two sets of second guide seats 220, respectively. During operation, the two first guide seats 210 (or two second guide seats 220) on the same side move synchronously along their corresponding guide shafts 230. The dual-axis, dual-support-point design significantly enhances the structural rigidity and deformation resistance of the entire positioning mechanism 200. Even when shearing extremely hard objects or encountering great resistance, it effectively prevents bending or torsional deformation that may occur with single-point support, ensuring that the first guide seats 210 and second guide seats 220 (and the cutter on them) always maintain parallel and stable linear motion, greatly improving the reliability and durability of the equipment under high-load conditions.

[0038] like Figures 1-3 As shown, in another embodiment of the present invention, the positioning mechanism 200 further includes a driving source, the output end of which is drivenly connected to the first guide seat 210 and the second guide seat 220, and the driving source is used to drive the first guide seat 210 and the second guide seat 220 to move closer or separate.

[0039] The drive source, such as a hydraulic cylinder or electric actuator in this embodiment, can act on the first guide seat 210 and the second guide seat 220, providing power to drive them to move towards each other (shearing) or away from each other (opening) along the guide shaft 230. This centralized drive method replaces the direct operation of the handle by traditional scissors, making operation less strenuous and providing a larger and smoother driving force. It significantly reduces the difficulty of operation and the required manpower, making it especially suitable for long-term or high-intensity rescue operations.

[0040] like Figures 1-3 As shown, in another embodiment of this utility model, the driving source includes a first driving shaft 261 and a second driving shaft 262. The first guide seat 210 and the second guide seat 220 are respectively provided with a first driving groove 263 and a second driving groove 264. The end of the first driving shaft 261 is slidably connected in the first driving groove 263, and the end of the second driving shaft 262 is slidably connected in the second driving groove 264. The first driving groove 263 and the second driving groove 264 are symmetrically distributed in the horizontal direction and are arranged in the inclined direction. The end of the first driving groove 263 near the first cutter 110 is inclined towards the guide shaft 230, and the end of the second driving groove 264 near the second cutter 120 is inclined towards the guide shaft 230.

[0041] like Figures 1-3As shown, the first drive shaft 261 and the second drive shaft 262 are driven by the same power source, like the piston rods at both ends of a hydraulic cylinder, performing linear reciprocating motion. In other embodiments, the first drive shaft 261 and the second drive shaft 262 can also be driven synchronously by different power sources. When the drive shaft advances inward (towards the center of the equipment), its ends slide within the inclined first drive groove 263 and the second drive groove 264. Since the drive grooves are inclined, the linear thrust of the drive shaft pushes the first guide seat 210 and the second guide seat 220 to move inward (towards each other) along the guide shaft 230 (achieving positioning and clamping). The remaining power sources then drive the first cutter 110 and the second cutter 120 to rotate around the pivot point (achieving shearing). This achieves a compound action of "clamping and positioning first, then rotating and shearing," simplifying the operation process, ensuring the necessity of the action sequence, and greatly improving the automation level, response speed, and operational smoothness of the equipment.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A shearing device for easy positioning and cutting, characterized in that, include: A cutting mechanism for cutting off a target object; A positioning mechanism, which is slidably connected to the cutting mechanism; The positioning mechanism is provided with a positioning guide groove, and the cutting mechanism is slidably connected in the positioning guide groove; the cutting mechanism is provided with a cutting position; when the target object moves to the cutting position, the positioning end of the positioning mechanism can position and clamp the target object before the cutting mechanism, and then the output end of the cutting mechanism acts on the target object and cuts it off.

2. The shearing device for easy positioning and cutting according to claim 1, characterized in that: The cutting mechanism includes a first cutter and a second cutter that are symmetrically distributed. One end of the first cutter and the second cutter are rotatably connected. The free ends of the first cutter and the second cutter rotate in opposite directions. The free ends of the first cutter and the second cutter are slidably connected to the positioning mechanism.

3. The shearing device for easy positioning and cutting according to claim 2, characterized in that: The positioning mechanism includes a guide shaft, a first guide seat, and a second guide seat. The first guide seat and the second guide seat are spaced apart along a straight line. The free end of the first cutter is slidably connected to the first guide seat, and the second cutter is slidably connected to the second guide seat. The first guide seat and the second guide seat are symmetrically slidably connected to both ends of the guide shaft.

4. The shearing device for easy positioning and cutting according to claim 2, characterized in that: The first cutter includes a first connecting seat, a first cutter head, and a first guide wheel. The positioning mechanism is provided with a first guide groove. The first guide wheel is rotatably connected to the end of the first connecting seat. The first cutter head is disposed on the first connecting seat. The first connecting seat is slidably connected in the positioning guide groove. The first guide wheel is slidably connected in the first guide groove. The second cutter includes a second connecting seat, a second cutter head, and a second guide wheel. The positioning mechanism is provided with a second guide groove. The second guide wheel is rotatably connected to the end of the second connecting seat. The second cutter head is disposed on the second connecting seat. The second connecting seat is slidably connected in the positioning guide groove, and the second guide wheel is slidably connected in the second guide groove. The ends of the first connecting seat and the second connecting seat are rotatably connected.

5. The shearing device for easy positioning and cutting according to claim 4, characterized in that: The first guide groove and the second guide groove are arranged in an arc-shaped path, and the first guide groove and the second guide groove are respectively concentrically arranged with the moving paths of the first guide wheel and the second guide wheel.

6. The shearing device for easy positioning and cutting according to claim 3, characterized in that: The first guide seat has an inverted U-shaped cross-section and a first groove inside. The first cutter is slidably connected in the first groove and slides against the inner wall of the first groove. The second guide seat has an inverted U-shaped cross-section and a second groove inside. The second cutter is slidably connected in the second groove and slides against the inner wall of the second groove.

7. The shearing device for easy positioning and cutting according to claim 3, characterized in that: The first guide seat has an inverted U-shaped cross-section and a first groove inside. The first cutter is slidably connected in the first groove and slides against the inner wall of the first groove. The second guide seat has an inverted U-shaped cross-section and a second groove inside. The second cutter is slidably connected in the second groove and slides against the inner wall of the second groove.

8. The shearing device for easy positioning and cutting according to claim 7, characterized in that: There are two sets of guide shafts, and there are two sets of first guide seats and two sets of second guide seats. The two sets of guide shafts are symmetrically distributed on both sides of the first guide seat and the second guide seat. The two sets of first guide seats and the two sets of second guide seats are slidably connected to the corresponding guide shafts.

9. The shearing device for easy positioning and cutting according to claim 7, characterized in that: The positioning mechanism further includes a drive source, the output end of which is drivenly connected to the first guide seat and the second guide seat, and the drive source is used to drive the first guide seat and the second guide seat to move closer or separate.

10. The shearing device for easy positioning and cutting according to claim 9, characterized in that: The drive source includes a first drive shaft and a second drive shaft. The first guide seat and the second guide seat are respectively provided with a first drive groove and a second drive groove. The end of the first drive shaft is slidably connected in the first drive groove, and the end of the second drive shaft is slidably connected in the second drive groove. The first drive groove and the second drive groove are symmetrically distributed in the horizontal direction and are arranged in an inclined direction. The end of the first drive groove near the first cutter is inclined towards the guide shaft, and the end of the second drive groove near the second cutter is inclined towards the guide shaft.

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