Hydraulic device for increasing the down pressure

Abstract

The utility model discloses a kind of hydraulic devices of increasing lower pressure, including shell breaking assembly, the shell breaking assembly includes the shell breaking piece for placing nut, the cross section of the shell breaking piece is horizontal plane, shell breaking piece and the outer surface of nut intersect at least three points, and the plane formed by the three points is horizontal plane;And press assembly is set in the directly above of shell breaking assembly, the press assembly exerts pressure to nut, which is directed to shell breaking piece. The utility model makes the action line of pressure always coincide with the vertical axis of nut when user presses pressing rod by setting small guide and big guide, and then make user can exert pressure to nut by body weight, secondly set the sealed cavity filled with hydraulic oil, so that small piston pushes big piston by hydraulic oil, realize the gain effect of pressure, improve the pressure to nut shell, secondly set the prism that evenly distributes and nut intersect at point, improve the pressure intensity of prism to nut, and then improve shell breaking efficiency.

Description

Technical Field

[0001] This utility model relates to the field of daily necessities technology, specifically to a hydraulic device for increasing downward pressure. Background Technology

[0002] As people's living standards improve, nuts are becoming increasingly popular due to their rich nutrition, delicious taste, and good texture. Since nuts generally have hard shells, they are inconvenient to eat. Initially, people commonly used hammers to remove them, but this method was inconvenient and noisy. Later, nutcrackers were invented, making the process much easier. Nutcrackers, used to crack open nuts and remove the whole kernel, are now an essential tool in every household.

[0003] The published utility model patent CN209932505U discloses a multifunctional nut cracker, including symmetrically arranged plier bars. A first auxiliary clamp is located in the middle of the plier bars, and the clamping side of the first auxiliary clamp has a groove. The first auxiliary clamp divides the plier bars into a clamping part and a gripping part. The top end of the clamping part is hinged, and the inner side of the clamping part has a first anti-slip tooth. The inventors of this application discovered that this embodiment converts the user's grip force into pressure on the nuts to crack them through a hinged connection. The ease of cracking with this method is related to the user's grip strength. Users with weak grip strength may not be able to crack harder nuts. Therefore, this method is limited by the user's grip strength and has a narrow range of applications. Utility Model Content

[0004] This utility model addresses the problem of reducing the difficulty of cracking nuts by providing a hydraulic device that increases downward pressure. The specific technical solution is as follows:

[0005] A hydraulic device for increasing downward pressure includes: a shell-crushing assembly including a shell-crushing member for placing a nut, the shell-crushing member having a horizontal cross-section and intersecting the outer surface of the nut at at least three points, the plane formed by the three points being a horizontal plane; and a pressing assembly disposed directly above the shell-crushing assembly, the pressing assembly applying pressure to the nut in the direction of the shell-crushing member.

[0006] Furthermore, the shell-breaking assembly also includes: a mounting platform forming a first groove; and a shell-breaking platform disposed inside the first groove, the side of the shell-breaking platform away from the first groove forming a second groove, the second groove being a frustum open at both ends, the axis of the second groove coinciding with the line of action of the pressure, the radial cross-sectional area of ​​the second groove gradually increasing in the direction away from the first groove, the inner side of the second groove forming a third groove, the length direction of the third groove being the generatrix direction of the second groove, and the horizontal cross-sectional area of ​​the third groove gradually increasing in the direction away from the first groove.

[0007] Preferably, the shell-breaking component includes: a dovetail tenon disposed in a third groove, the area of ​​the horizontal cross-section of the dovetail tenon gradually increasing in the direction away from the first groove, and the length of the side of the horizontal cross-section of the dovetail tenon away from the second groove being greater than the side close to the second groove, and the side of the third groove being completely fitted with the side of the dovetail tenon; and a prism disposed on the side of the dovetail tenon close to the second groove, the cross-section of the prism in the vertical length direction being triangular, the base of the triangle contacting the dovetail tenon, and the vertex of the triangle making point contact with the nut.

[0008] Preferably, the pressing assembly is arranged along the axis toward the nut as follows: pressing rod, compression spring, small guide, cylinder, small piston, large piston, large guide, pressing column, and housing. The pressing rod moves toward the nut along the axial direction of the small guide, the compression spring is compressed, the pressing rod pushes the small piston to move along the radial inner side of the cylinder, the small piston pushes the large piston to move along the large guide, the large piston pushes the pressing column to apply pressure to the nut, and the housing can restrict the vertical degree of freedom of the pressing column.

[0009] Preferably, the cylinder body is divided into two sections along the direction of applied pressure: a moving section coaxial with the small piston, the inner diameter of which is equal to the diameter of the small piston, the radial outer surface of the small piston moves along the radial inner surface of the moving section, and the length of the moving section is not less than the stroke of the small piston; and a pressurizing section coaxial with the large piston, the inner diameter of which is equal to the diameter of the large piston and is greater than the inner diameter of the moving section, the radial outer surface of the large piston moves along the radial inner surface of the pressurizing section, and the axial length of the pressurizing section is not less than the stroke of the large piston; the small piston, the moving section, the pressurizing section, and the large piston can form a sealed cavity for placing hydraulic oil.

[0010] Preferably, the pressing column is divided into two sections along the direction of the applied pressure: a first section fixedly connected to the large piston, the radial outer surface of which moves along the radial inner surface of the through hole of the large guide member, and the diameter of the first section is equal to the inner diameter of the through hole of the large guide member; and a second section coaxial with the first section, the diameter of which is greater than that of the first section. The second section is positioned between the housing and the shell-breaking member, and the movement of the first section can push the second section to move. The end face of the second section away from the first section forms an arc-shaped groove, and the highest point of the arc-shaped groove coincides with the axis of the second section.

[0011] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0012] This invention uses small and large guide components to ensure that the line of action of the pressure applied when the user presses the pressing rod always coincides with the vertical axis of the nut, allowing the user to apply pressure to the nut using their body weight. Secondly, a sealed cavity filled with hydraulic oil is provided, allowing the small piston to push the large piston through the hydraulic oil, achieving a pressure gain effect and increasing the pressure on the nut shell. Furthermore, evenly distributed prisms are provided that intersect with the nut at points, increasing the pressure exerted by the prisms on the nut, thereby improving the shell-breaking efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0014] Figure 2 This is a schematic diagram of the structure of an embodiment of the hatching stage;

[0015] Figure 3 This is a schematic diagram of the structure of an embodiment of the shell-breaking component;

[0016] Figure 4 for Figure 1 Sectional view.

[0017] In the diagram: 1. Shell-breaking assembly; 11. Mounting platform; 111. First groove; 112. Mounting groove; 12. Shell-breaking platform; 121. Second groove; 122. Third groove; 13. Shell-breaking component; 131. Dovetail tenon; 132. Prism; 2. Pressing assembly; 21. Pressing rod; 22. Compression spring; 23. Small guide component; 24. Cylinder body; 241. Moving section; 242. Pressurizing section; 243. Sealed cavity; 25. Small piston; 26. Large piston; 27. Large guide component; 28. Pressing column; 281. First section; 282. Second section; 283. Arc-shaped groove; 29. ​​Shell; 291. Support column. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing 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.

[0020] like Figure 1 As shown, the present invention includes: a shell-breaking component 1, which includes a shell-breaking member 13 for placing nuts, the cross-section of the shell-breaking member 13 being a horizontal plane, the shell-breaking member 13 intersecting the outer surface of the nuts at at least three points, and the plane formed by the three points being a horizontal plane; and a pressing component 2 disposed directly above the shell-breaking component 1, the pressing component 2 applying pressure to the nuts in the direction of the shell-breaking member 13.

[0021] Specifically, in this embodiment, the processed nuts are standard spherical. The bottom surface of the shell-breaking component 1 is placed on a horizontal surface, making the cross-section of the shell-breaking component 1 horizontal. Consequently, the cross-section of the shell-breaking part 13 is also horizontal, ensuring that the line of action of the gravity of the nut placed on the shell-breaking part 13 is perpendicular to the cross-section of the shell-breaking part 13. In this embodiment, the shell-breaking part 13 intersects the nut at three points, and the plane formed by these three points is horizontal. This ensures that the line of action of the horizontal component of the supporting force applied by the shell-breaking part 13 to the nut through the three points is also on the same horizontal plane. Consequently, the area where the nut's shell is damaged is on the same horizontal plane, improving shell-breaking efficiency and preventing the damaged areas from forming a non-horizontal plane. This would prevent the nut from rolling under the action of torque when pressure is applied, resulting in low shell-breaking efficiency.

[0022] Secondly, the pressing component 2 is placed directly above the nut. When the user presses the pressing component 2, it applies pressure to the nut placed on the shell-breaking component 13. The line of action of this pressure is perpendicular to the horizontal plane and passes through the center of the nut. After the pressing component 2 applies pressure to the nut, the shell-breaking component 1 applies a supporting force to the nut through three contact points. As the pressure gradually increases, the supporting force gradually increases until the supporting force breaks the nut's shell. In this process, the user only needs to apply vertically downward pressure to the nut using the pressing component 2 to crush the nut's shell, changing the direction of force application, reducing the difficulty of shell breaking, and improving the shell-breaking efficiency.

[0023] Combination Figure 2As shown, the shell-breaking assembly 1 further includes: a mounting platform 11, which forms a first groove 111; and a shell-breaking platform 12 disposed inside the first groove 111, wherein the side of the shell-breaking platform 12 away from the first groove 111 forms a second groove 121, the axis of the second groove 121 coincides with the line of action of the pressure, the second groove 121 is a frustum with open ends, the area of ​​the radial cross-section of the second groove 121 gradually increases in the direction away from the first groove 111, and a third groove 122 is formed on the inner side of the second groove 121, the length direction of the third groove 122 is the generatrix direction of the second groove 121, and the area of ​​the horizontal cross-section of the third groove 122 gradually increases in the direction away from the first groove 111.

[0024] Specifically, the bottom surface of the mounting platform 11 is placed on a horizontal ground, and its top surface forms a first groove 111. The side of the first groove 111 is completely fitted with the side of the shelling platform 12, and it has an open end for separating the shelling platform 12 from the mounting platform 11, so that it is easy to replace the nuts placed on the shelling platform 12 and improve the convenience of shelling.

[0025] Secondly, the shell-breaking platform 12 forms a through-hole 121 directly below the pressing component 2. The cross-section of the second groove 121 is an inverted frustum, and the cross-sectional area of ​​its bottom surface is smaller than that of its top surface. This allows the second groove 121 to achieve automatic centering, thereby enabling the nuts placed on the second groove 121 to automatically center and align their vertical axis with the axis of the second groove 121. This ensures that the position of the nuts does not change under pressure, thus keeping the force point of the nuts constant and improving shell-breaking efficiency. The through hole at the bottom of the second groove 121 allows shell fragments of the nuts to pass through after shelling, improving the cleanliness of the shell-breaking platform 12 after shelling.

[0026] Secondly, a third groove 122 is formed on the inclined side of the second groove 121. The length direction of the third groove 122 is the generatrix direction of the second groove 121. In this embodiment, it is preferable to have three third grooves 122 for placing three shell-breaking parts 13 respectively, so that the nut can automatically center along the length direction of the third groove 122. The top surface area of ​​the cross-section of the third groove 122 is larger than the bottom surface area, so that the shell-breaking part 13 can receive the oblique upward support force from the side of the third groove 122 after being placed in the third groove 122. This allows the third groove 122 to restrict the shell-breaking part 13 from moving to the bottom surface. When the pressing component 2 applies pressure to the nut, the mounting platform 11 applies a support force to the shell-breaking platform 12 through the first groove 111, and the shell-breaking platform 12 applies a support force to the shell-breaking part 13 through the third groove 122. The shell-breaking part 13 applies a support force through the three contact points with the nut. The vertical component of this support force is proportional to the pressure. The support force increases with the pressure until the shell of the nut breaks.

[0027] Combination Figure 3 As shown, the shell-breaking component 13 includes: a dovetail tenon 131 disposed in the third groove 122, the area of ​​the horizontal cross-section of the dovetail tenon 131 gradually increases along the direction away from the first groove 111, and the length of the side of the horizontal cross-section of the dovetail tenon 131 away from the second groove 121 is greater than the side close to the second groove 121, and the side of the third groove 122 is completely fitted with the side of the dovetail tenon 131; and a prism 132 disposed on the side of the dovetail tenon 131 close to the second groove 121, the cross-section of the prism 132 in the vertical length direction is triangular, the base of the triangle contacts the dovetail tenon 131, and the vertex of the triangle makes point contact with the nut.

[0028] Specifically, the side of the dovetail tenon 131 is completely fitted with the side of the third groove 122, so that the third groove 122 can restrict the downward movement of the dovetail tenon 131, thereby fixing the position of the shell-breaking piece 13 and stabilizing the relative position of the nut and the shell-breaking piece 13. The cross-section of the dovetail tenon 131 is a trapezoidal quadrilateral, and the side length of the side closer to the axis is smaller than the side length away from the axis, so that the third groove 122 can apply a horizontal component force away from the axis to the side of the dovetail tenon 131, thereby restricting the horizontal degree of freedom of the dovetail tenon 131, further fixing the position of the shell-breaking piece 13 and further stabilizing the relative position of the nut and the shell-breaking piece 13.

[0029] Secondly, a prism 132 is formed on the inner side of the dovetail tenon 131. The length direction of the prism 132 is the same as the length direction of the dovetail tenon 131, and one side of the prism 132 protruding from the dovetail tenon 131 is tangent to the outer surface of the nut at three points. These three points are the three points where the shell-breaking component 13 intersects with the nut. This makes the contact area between the prism 132 and the nut extremely small, thereby increasing the pressure of the prism 132 on the nut and thus improving the shell-breaking efficiency.

[0030] like Figure 4 As shown, the pressing assembly 2 is arranged along the axis toward the nut as follows: pressing rod 21, compression spring 22, small guide 23, cylinder 24, small piston 25, large piston 26, large guide 27, pressing column 28, and housing 29. The pressing rod 21 moves toward the nut along the axial direction of the small guide 23, the compression spring 22 is compressed, the pressing rod 21 pushes the small piston 25 to move along the radial inner side of the cylinder 24, the small piston 25 pushes the large piston 26 to move along the large guide 27, the large piston 26 pushes the pressing column 28 to apply pressure to the nut, and the housing 29 can restrict the vertical degree of freedom of the pressing column 28.

[0031] Specifically, when the user presses down on the pressing lever 21, the radially outer surface of the pressing lever 21 slides downwards and connects sequentially with the compression spring 22 and the small guide member 23, allowing the pressing lever 21 to move downwards along the small guide member 23. This compresses the compression spring 22, simultaneously causing the small piston 25, fixed at its bottom, to slide along the inner side of the cylinder 24. The cylinder 24 is filled with hydraulic oil between the small piston 25 and the large piston 26, causing the small piston 25 to push the hydraulic oil downwards, thereby moving the large piston 26. The bottom end of the cylinder 24 slides with the radially outer surface of the large guide member 27, and the large guide member 27... A through hole is formed in the middle for placing the pressing post 28. The large piston 26 moves downward along the cylinder 24 and the large guide 27, thereby driving the pressing post 28, which is fixed at one end to the bottom surface of the large piston 26, to move downward. Secondly, the housing 29 has a large diameter opening at one end and a small diameter at the other end for passing through the through hole of the pressing post 28. When the pressing rod 21 moves downward, it drives the cylinder 24 to slide along the housing 29, thereby driving the pressing post 28 to move along the housing 29. This ensures that the axis of the pressing post 28 remains stable during the movement, and thus ensures that the pressure applied by the pressing post 28 to the nut remains stable.

[0032] Secondly, the housing 29 restricts the vertical movement of the pressing post 28 through the through hole of the pressing post 28 by the diameter difference between the pressing post 28 and the pressing post 28. Furthermore, three support posts 291 are formed on the side of the housing 29 near the mounting platform 11. These support posts 291 are evenly distributed circumferentially. Three mounting grooves 112 are formed on the top surface of the mounting platform 11 corresponding to the positions of the support posts 291 for placing the support posts 291. This creates a gap between the bottom surface of the housing 29 and the top surface of the mounting platform 11. By adjusting the depth of the support posts 291 embedded in the mounting grooves 112, the height of the gap between the bottom and top surfaces can be adjusted, thereby allowing for adjustment according to the size of the nut and improving the adaptability of the embodiment.

[0033] Furthermore, the cylinder body 24 is divided into two sections along the direction of applied pressure: a moving section 241 coaxial with the small piston 25, the inner diameter of which is equal to the diameter of the small piston 25, the radial outer surface of the small piston 25 moving along the radial inner surface of the moving section 241, and the length of the moving section 241 being no less than the stroke of the small piston 25; and a pressurizing section 242 coaxial with the large piston 26, the inner diameter of which is equal to the diameter of the large piston 26, and the inner diameter of the pressurizing section 242 being greater than the inner diameter of the moving section 241, the radial outer surface of the large piston 26 moving along the radial inner surface of the pressurizing section 242, and the axial length of the pressurizing section 242 being no less than the stroke of the large piston 26; the small piston 25, the moving section 241, the pressurizing section 242, and the large piston 26 can form a sealed cavity 243 for placing hydraulic oil.

[0034] Specifically, the cylinder 24 is divided into a moving section 241 and a pressurizing section 242 according to its diameter. Under the pressure of the pressing rod 21, the small piston 25 moves downward along the radial inner side of the moving section 241 until the bottom surface of the small piston 25 coincides with the bottom surface of the moving section 241. At this time, the small piston 25 moves to its farthest position, and the compression spring 22 is compressed to its shortest length. During the downward movement of the small piston 25, the bottom surface of the small piston 25 pushes the lubricating oil in the moving section 241 to flow into the pressurizing section 242. During this process, the pressure on the lubricating oil in the moving section 241 is equal to the pressure on the lubricating oil in the pressurizing section 242. Because the inner diameter of the moving section 241 is smaller than the inner diameter of the pressurizing section 242, according to F=PS, the pressure of the lubricating oil on the large piston 26 is greater than the pressure of the small piston 25 on the lubricating oil, thereby achieving pressurization, which reduces the pressure applied by the user when crushing nuts and improves the shelling effect of nuts.

[0035] Furthermore, the pressing column 28 is divided into two sections along the direction of the applied pressure: a first section 281 fixedly connected to the large piston 26, the radial outer side of the first section 281 moving along the radial inner side of the through hole of the large guide member 27, the diameter of the first section 281 being equal to the inner diameter of the through hole of the large guide member 27; and a second section 282 coaxial with the first section 281, the diameter of the second section 282 being larger than the diameter of the first section 281, the second section 282 being disposed between the housing 29 and the shell-breaking member 13, the first section 281 moving can push the second section 282 moving, the end face of the second section 282 away from the first section 281 forming an arc-shaped groove 283, the highest point of the arc-shaped groove 283 coinciding with the axis of the second section 282.

[0036] Specifically, the pressing column 28 is divided into a first section 281 and a second section 282 according to its diameter. The large piston 26 pushes the first section 281 to move along the large guide member 27, which in turn pushes the second section 282 to move downward. The bottom surface of the second section 282 forms an arc-shaped groove 283. The highest point of the arc-shaped groove 283 coincides with the axis of the large piston 26, so that the line of action of the pressure of the large piston 26 on the nut passes through the highest point of the arc-shaped groove 283, thereby reducing the useless component of the pressure and improving the shell-breaking efficiency. Secondly, when the shell is broken, the compression spring 22 applies an upward elastic force to the pressing rod 21, which in turn drives the pressing column 28 to move upward relative to the large guide member 27. Since the diameter of the second section 282 is larger than the middle through hole of the large guide member 27, the large guide member 27 can limit the second section 282 from moving upward, thereby achieving vertical positioning of the pressing column 28.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0038] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A hydraulic device for increasing a downforce, characterized by, include: A shell-breaking assembly (1) comprising a shell-breaking component (13) for holding nuts, the cross-section of the shell-breaking component (13) being a horizontal plane, the shell-breaking component (13) intersecting the outer surface of the nut at at least three points, and the plane formed by the three points being a horizontal plane; and A pressing component (2) is positioned directly above the shell-breaking component (1), which applies pressure to the nut in the direction of the shell-breaking component (13).

2. Hydraulic device according to claim 1, characterized in that The shell-breaking component (1) also includes: Mounting platform (11), which forms a first groove (111); and A shell-breaking platform (12) is disposed inside the first groove (111). The side of the shell-breaking platform (12) away from the first groove (111) forms a second groove (121). The second groove (121) is a frustum with open ends. The axis of the second groove (121) coincides with the line of action of the pressure. The radial cross-sectional area of ​​the second groove (121) gradually increases in the direction away from the first groove (111). A third groove (122) is formed on the inner side of the second groove (121). The length direction of the third groove (122) is the generatrix direction of the second groove (121). The horizontal cross-sectional area of ​​the third groove (122) gradually increases in the direction away from the first groove (111).

3. Hydraulic device according to claim 2, characterized in that: The shell-breaking component (13) includes: A dovetail tenon (131) is provided in the third groove (122). The area of ​​the horizontal cross-section of the dovetail tenon (131) gradually increases in the direction away from the first groove (111), and the length of the side of the horizontal cross-section of the dovetail tenon (131) away from the second groove (121) is greater than the length of the side close to the second groove (121). The side of the third groove (122) is completely fitted with the side of the dovetail tenon (131). A prism (132) is provided on the side of the dovetail tenon (131) near the second groove (121). The cross-section of the prism (132) in the vertical length direction is triangular. The base of the triangle contacts the dovetail tenon (131), and the vertex of the triangle makes point contact with the nut.

4. The hydraulic device of claim 1, wherein: The pressing assembly (2) is arranged along the axis toward the nut as follows: pressing rod (21), compression spring (22), small guide (23), cylinder (24), small piston (25), large piston (26), large guide (27), pressing column (28), and housing (29). The pressing rod (21) moves toward the nut along the axial direction of the small guide (23), the compression spring (22) is compressed, the pressing rod (21) pushes the small piston (25) to move along the radial inner side of the cylinder (24), the small piston (25) pushes the large piston (26) to move along the large guide (27), the large piston (26) pushes the pressing column (28) to apply pressure to the nut, and the housing (29) can restrict the vertical degree of freedom of the pressing column (28).

5. Hydraulic device according to claim 4, characterized in that: The cylinder (24) is divided into two sections along the direction of the applied pressure: A movable segment (241) coaxial with the small piston (25) has an inner diameter equal to that of the small piston (25). The radial outer side of the small piston (25) moves along the radial inner side of the movable segment (241). The length of the movable segment (241) is not less than the stroke of the small piston (25). A pressurizing section (242) is coaxial with the large piston (26). The inner diameter of the pressurizing section (242) is equal to the diameter of the large piston (26), and the inner diameter of the pressurizing section (242) is greater than the inner diameter of the moving section (241). The radial outer side of the large piston (26) moves along the radial inner side of the pressurizing section (242). The axial length of the pressurizing section (242) is not less than the stroke of the large piston (26). The small piston (25), the moving section (241), the pressurizing section (242), and the large piston (26) can form a sealed cavity (243) for placing hydraulic oil.

6. The hydraulic device of claim 4, wherein: The pressing column (28) is divided into two sections along the direction of the applied pressure: The first segment (281) is fixedly connected to the large piston (26), and the radial outer side of the first segment (281) moves along the radial inner side of the through hole of the large guide (27). The diameter of the first segment (281) is equal to the inner diameter of the through hole of the large guide (27). A second segment (282) is coaxial with the first segment (281), and the diameter of the second segment (282) is larger than that of the first segment (281). The second segment (282) is disposed between the housing (29) and the shell-breaking component (13). When the first segment (281) moves, it can push the second segment (282) to move. An arc-shaped groove (283) is formed on the end face of the second segment (282) away from the first segment (281). The highest point of the arc-shaped groove (283) coincides with the axis of the second segment (282).

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