A combination structure of hanging cup sealing cover

Abstract

The present invention belongs to the technical field of water cup sealing, and in particular to a combination structure of a hanging cup sealing cover. The following scheme is proposed, including a cup body and a cup cover, the cup cover is arranged on the top of the cup body, the outer wall of the cup cover is rotatably connected to a handle, the bottoms of both ends of the handle are fixedly connected to lock buckles, the tops of the outer walls on both sides of the cup body are provided with movable grooves adapted to the lock buckles, the middle parts of the two lock buckles close to each other are fixedly connected to locking points, the middle parts of the two movable grooves are provided with locking grooves, the inner walls of both sides of the two lock grooves are provided with guiding inclined surfaces, the two sides of the cup cover are rotatably connected to couplings, and the two sides of the couplings away from each other are fixedly connected to the two ends of the handle. In the present invention, when the cup cover is opened, the cup body is connected to the outside atmosphere to prevent the cup cover from being difficult to open under negative pressure conditions. The above process can be achieved by the user simply turning the handle, ensuring that the sealing and opening steps of the cup body are simple and smooth.

Description

Technical Field

[0001] The invention relates to the technical field of water cup sealing, and in particular to a combined structure of a hanging cup sealing cover. Background Art

[0002] The sealed cup belongs to the technical field of daily utensils, and is generally composed of a cup body and a cup cover, wherein the cup cover is sealed and connected to the cup body.

[0003] After searching, a Chinese patent application with application publication number CN215271911U discloses a self-locking thermos cup, in which the lid and the cup body are snap-fitted together, and then the elastic hanging rod on the cup body cooperates with the hook on the lid body. The elastic hanging rod locks the lid and the cup body through the force provided by the spring, and the sealing ring ensures the sealing of the connection, and there will be no leakage or accidental pressing that will cause the cup lid to open. The lid can be opened by removing the elastic hanging rod from the hook.

[0004] The process of installing and opening the cup cover of the above device is complicated, and there is a phenomenon that the cup cover is difficult to open due to the pressure difference between the inside and outside of the cup body. It is urgent to design a combination structure of a hanging cup sealing cover to solve the above problems. Summary of the invention

[0005] Based on the technical problems that the self-locking thermos cup is complicated to operate and difficult to open under negative pressure, the present invention proposes a combination structure of a hanging cup sealing cover.

[0006] The present invention proposes a combined structure of a hanging cup sealing cover, comprising a cup body and a cup cover, wherein the cup cover is arranged on the top of the cup body, the outer wall of the cup cover is rotatably connected to a handle, the bottoms of both ends of the handle are fixedly connected to lock buckles, the tops of the outer walls on both sides of the cup body are provided with movable grooves adapted to the lock buckles, the middle parts of the two lock buckles on the sides close to each other are fixedly connected to locking points, the middle parts of the two movable grooves are provided with locking grooves, the inner walls on both sides of the two lock grooves are provided with guiding inclined surfaces, the two sides of the cup cover are rotatably connected to couplings, and the two sides of the couplings away from each other are respectively connected to the two ends of the handle. Fixed connection, the side where the two couplings are close to each other is fixedly connected to the same crankshaft, the middle part of the crankshaft is rotatably connected to a connecting rod, the top of the connecting rod is fixedly connected to a ball head, the outside of the ball head is sleeved with a ball groove, the outer wall of the top of the ball groove is fixedly connected to a hanging rod, the middle part of the cup cover is plugged with a ventilation pipe, the inside of the ventilation pipe is slidably connected to a closing plug, the bottom of the closing plug is provided with four evenly distributed longitudinal air holes, the side of the closing plug is provided with four evenly distributed transverse air holes, the four longitudinal air holes are respectively connected to the four transverse air holes, and the hanging rod is fixedly connected to the middle position of the bottom of the closing plug.

[0007] Preferably, a protective sleeve is fixedly connected to the middle position of the outer wall at the top of the cup cover, an opening is provided at the middle position of the top of the protective sleeve, and a filter is fixedly connected to the inner wall of the opening at the top of the protective sleeve.

[0008] Preferably, a vent cap is circumferentially threadedly connected to the outer wall of the protective sleeve, and a circumferentially distributed vent hole is formed on the side of the vent cap.

[0009] Preferably, the outer walls on both sides of the cup cover are fixedly connected to the limiting position, and both ends of the handle are fixedly connected to the limiting feet.

[0010] Preferably, the outer wall of the top of the cup body is provided with four rectangularly distributed slots, the circumference of the outer wall of the bottom of the cup cover is fixedly connected with a cover edge, the bottom of the cover edge is fixedly connected with four rectangularly distributed lock buckles, and the four lock buckles are respectively snapped into the inside of the four slots.

[0011] Preferably, a clamping ring is fixedly connected to the circumference of the inner wall of the cup cover, a first sealing ring is clamped at the bottom of the clamping ring, and the bottom of the first sealing ring is attached to the top of the cup body.

[0012] Preferably, a second sealing ring is embedded in the top of the cup body, the top of the second sealing ring is in contact with the bottom of the lid edge, and the inner diameter of the second sealing ring is greater than the outer diameter of the first sealing ring.

[0013] Preferably, a storage hole is opened on one side of the cup cover, and a cone is provided on the side of the storage hole close to the outer wall of the cup cover, a telescopic rod is fixedly connected to the middle part of the cone close to the inner wall of the cup cover, the outer wall of the top of the clamping ring is fixedly connected to the limiting sleeve, the telescopic rod is slidably connected to the inside of the limiting sleeve, a spring is sleeved on the outside of the telescopic rod, and the two ends of the spring are respectively fixedly connected to the limiting sleeve and the cone, a buckle adapted to the cone is provided in the middle of the handle, and one end of the cone is inserted into the inside of the buckle.

[0014] Preferably, a positioning pin is fixedly connected to the inner wall of the buckle top, a pin hole is opened in the middle of the clamping cone, and the bottom of the positioning pin is inserted into the pin hole of the clamping cone.

[0015] Preferably, a boost slope is fixedly connected to the inner wall of the buckle bottom, and a side of the boost slope close to the clamping cone is set as an arc surface, and the width of the top of the boost slope is smaller than the width of its bottom.

[0016] Compared with the prior art, the present invention provides a combination structure of a hanging cup sealing cover, which has the following beneficial effects: 1. The combined structure of a hanging cup sealing cover is provided with a handle, a lock buckle, a locking point, a locking groove, a crankshaft, a connecting rod, a ball head, a ball groove, a closing plug, a longitudinal air hole and a transverse air hole. The cup cover is placed on the top of the cup body so that the two ends of the handle are respectively located above the two movable grooves. The handle is turned so that the two lock buckles cover the two movable grooves respectively. During this process, the two locking points are squeezed and deformed along the corresponding guide inclined surfaces and are respectively inserted into the two locking grooves. The two guide inclined surfaces inside the same locking groove locate the inserted locking points from both sides. When the cup cover needs to be opened, the lock buckles are moved in the reverse direction. Perform the above operation, turn the handle upward, and the two locking points disengage from the lock groove. During the rotation of the handle, the coupling and the crankshaft rotate synchronously, and drive the connecting rod to rotate eccentrically, and lift the closing plug upward through the suspension rod, so that the height of the horizontal air hole is higher than the height of the top of the ventilation pipe. At this time, the horizontal air hole is connected to the top of the cup cover, and the longitudinal air hole is connected to the cup body, thereby realizing the conduction between the cup body and the outside atmosphere, preventing the cup cover from being difficult to open under negative pressure conditions. The above process can be achieved by the user only by turning the handle, ensuring that the sealing and opening steps of the cup body are simple and smooth.

[0017] 2. The combined structure of a hanging cup sealing cover is provided with a protective sleeve, a filter, a vent cap and vent holes. The protective sleeve is located above the closing plug to shield the lateral pores of the closing plug to prevent dust from falling in. The opening at the top of the protective sleeve can be used for gas circulation. The filter screen filters the airflow to prevent dust from entering the cup body with the airflow. The vent cap covers the top of the protective sleeve, and the vent holes are provided on the side of the vent cap to prevent dust from falling directly on the filter screen, thereby improving the utilization rate of the filter screen. The vent cap is threadedly connected to the protective sleeve so that the vent cap can be removed from the top of the protective sleeve to facilitate the cleaning of the protective sleeve and the filter screen.

[0018] 3. The combined structure of a hanging cup sealing cover is provided with a buckle, a clamping cone, a spring, a positioning pin and a pressurizing slope. When the handle is turned downward and the cup cover is installed on the top of the cup body, the bottom of the pressurizing slope in the buckle first contacts the clamping cone, and the bottom of the pressurizing slope presses the top inclined surface of the clamping cone to press the clamping cone into the storage hole. The telescopic rod slides into the cup cover along the inner wall of the limiting sleeve, and the spring contracts under the force. When the cup cover is installed and the handle is turned, the pressurizing slope reaches the bottom of the clamping cone, and the spring pushes the clamping cone to reset, so that the clamping cone is pressed on the top of the pressurizing slope and the inner wall of the side of the buckle, and the handle is auxiliary fixed, so that the handle in this state can be fixed without being used. When the user actively turns it, it is not easily affected by external forces, which optimizes the sealing effect of the cup cover. When the cone is inserted into the buckle, the positioning pin is simultaneously inserted into the pin hole of the cone to strengthen the connection between the buckle and the cone. When the handle needs to be turned upward, the narrower top of the boost slope first contacts the cone, applying a continuous upward pulling force to the handle, and the arc surface of the boost slope slides relative to the cone. As the cone contacts the wider position of the boost slope, the pressure on the cone gradually increases until the cone is completely immersed in the storage hole, and the spring contracts again. At this time, the boost slope loses its obstruction, and then the buckle leaves the cone, the handle turns upward smoothly, and the spring pops out the cone to reset it. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a combination structure of a hanging cup sealing cover proposed by the present invention; Figure 2 This is a schematic diagram of the structure of the combination structure of the hanging cup sealing cover proposed by the present invention, in which the handle is in an upwardly flipped state; Figure 3 A schematic diagram of a cup cover structure of a combination structure of a hanging cup sealing cover proposed by the present invention; Figure 4 A schematic diagram of the structure of a hanging cup sealing cover assembly structure proposed by the present invention; Figure 5 This is a schematic cross-sectional view of a combined structure of a hanging cup sealing cover proposed by the present invention; Figure 6 A schematic diagram of a crankshaft and a closing plug structure of a combination structure of a hanging cup sealing cover proposed by the present invention; Figure 7 A schematic cross-sectional view of the buckle structure of a combination structure of a hanging cup sealing cover proposed by the present invention; Figure 8 This is a schematic diagram of the cup body structure of a combination structure of a hanging cup sealing cover proposed by the present invention.

[0020] In the figure: 1. cup body; 2. cup cover; 3. cover edge; 4. handle; 5. buckle; 6. positioning block; 7. limit point; 8. limit foot; 9. lock buckle; 10. movable groove; 11. slot; 12. vent cap; 13. locking point; 14. cone; 15. coupling; 16. first sealing ring; 17. vent pipe; 18. closing plug; 19. suspension rod; 20. ball slot; 21. ball head; 22. connecting rod; 23. crankshaft; 24. longitudinal air hole; 25. transverse air hole; 26. protective cover; 27. filter; 29. ​​vent hole; 30. snap ring; 31. storage hole; 32. limit sleeve; 33. spring; 34. telescopic rod; 35. boost slope; 36. positioning pin; 37. second sealing ring; 38. locking slot; 39. guide slope. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Reference Figure 1-8 A combination structure of a hanging cup sealing cover comprises a cup body 1 and a cup cover 2. The cup cover 2 is arranged on the top of the cup body 1. The outer wall of the cup cover 2 is rotatably connected with a handle 4. The bottoms of both ends of the handle 4 are fixedly connected with lock buckles 9. The tops of the outer walls on both sides of the cup body 1 are provided with movable grooves 10 adapted to the lock buckles 9. The middle parts of the two lock buckles 9 close to each other are fixedly connected with locking points 13. The middle parts of the two movable grooves 10 are provided with locking grooves 38. The inner walls of the two sides of the two lock grooves 38 are provided with guiding inclined surfaces 39. The two sides of the cup cover 2 are rotatably connected with couplings 15. The two sides of the two couplings 15 away from each other are fixedly connected with the two ends of the handle 4 respectively. The two couplings 15 A crankshaft 23 is fixedly connected to the adjacent side, a connecting rod 22 is rotatably connected to the middle of the crankshaft 23, a ball head 21 is fixedly connected to the top of the connecting rod 22, a ball groove 20 is sleeved on the outside of the ball head 21, a hanging rod 19 is fixedly connected to the outer wall of the top of the ball groove 20, a vent pipe 17 is inserted into the middle of the cup cover 2, a closing plug 18 is slidably connected to the inside of the vent pipe 17, four evenly distributed longitudinal air holes 24 are opened at the bottom of the closing plug 18, four evenly distributed transverse air holes 25 are opened on the side of the closing plug 18, the four longitudinal air holes 24 are respectively connected to the four transverse air holes 25, and the hanging rod 19 is fixedly connected to the middle position of the bottom of the closing plug 18.

[0023] In the present invention, a protective sleeve 26 is fixedly connected to the middle position of the outer wall at the top of the cup cover 2, an opening is provided at the middle position of the top of the protective sleeve 26, a filter screen 27 is fixedly connected to the inner wall of the opening at the top of the protective sleeve 26, the protective sleeve 26 is located above the closing plug 18, and shields the transverse air holes 25 of the closing plug 18 to prevent dust from falling in, the opening at the top of the protective sleeve 26 can be used for gas circulation, and the filter screen 27 filters the airflow to prevent dust from entering the cup body 1 with the airflow.

[0024] In the present invention, the outer wall of the protective sleeve 26 is circumferentially threadedly connected to the vent cap 12, and the side of the vent cap 12 is provided with circumferentially distributed vent holes 29. The vent cap 12 covers the top of the protective sleeve 26, and the vent holes 29 are opened on the side of the vent cap 12 to prevent dust from falling directly on the filter 27. The vent cap 12 is threadedly connected to the protective sleeve 26, so that the vent cap 12 can be removed from the top of the protective sleeve 26.

[0025] In the present invention, the outer walls on both sides of the cup cover 2 are fixedly connected to the limiting point 7, and both ends of the handle 4 are fixedly connected to the limiting feet 8. The limiting point 7 is set on the rotation path of the limiting feet 8 and the handle 4 to limit the rotation range of the handle 4.

[0026] In the present invention, four rectangularly distributed card slots 11 are opened on the outer wall of the top of the cup body 1, the circumference of the outer wall of the bottom of the cup cover 2 is fixedly connected with a cover edge 3, and the bottom of the cover edge 3 is fixedly connected with four rectangularly distributed lock buckles 9, which are respectively snapped into the inside of the four card slots 11, and the four lock buckles 9 correspond to the four card slots 11 respectively. When the cup cover 2 is placed on the top of the cup body 1, positioning can be achieved through the lock buckles 9 and the card slots 11.

[0027] In the present invention, a clamping ring 30 is fixedly connected to the circumference of the inner wall of the cup cover 2, and a first sealing ring 16 is clamped at the bottom of the clamping ring 30. The bottom of the first sealing ring 16 is attached to the top of the cup body 1. The first sealing ring 16 is fixed to the inside of the cup cover 2 by the clamping ring 30. The first sealing ring 16 cooperates with the circumference of the top of the cup body 1 to achieve sealing of the cup body 1.

[0028] In the present invention, a second sealing ring 37 is embedded in the top of the cup body 1, and the top of the second sealing ring 37 is attached to the bottom of the cover edge 3. The inner diameter of the second sealing ring 37 is larger than the outer diameter of the first sealing ring 16. The second sealing ring 37 cooperates with the cover edge 3 at the bottom of the cup cover 2 to further optimize the sealing of the cup body 1.

[0029] In the present invention, a storage hole 31 is opened on one side of the cup cover 2, and a clamping cone 14 is arranged on one side of the storage hole 31 close to the outer wall of the cup cover 2, and a telescopic rod 34 is fixedly connected to the middle part of the clamping cone 14 close to the inner wall of the cup cover 2, and a limiting sleeve 32 is fixedly connected to the outer wall of the top of the clamping ring 30, and the telescopic rod 34 is slidably connected to the inside of the limiting sleeve 32, and a spring 33 is sleeved on the outside of the telescopic rod 34, and the two ends of the spring 33 are respectively fixedly connected to the limiting sleeve 32 and the clamping cone 14, and a buckle 5 adapted to the clamping cone 14 is arranged in the middle part of the handle 4, and one end of the clamping cone 14 is inserted into the inside of the buckle 5, and the handle 4 is turned downward to install the cup cover 2 on the top of the cup body 1 When the cup cover 2 is installed and the handle 4 is rotated, the boost slope 35 reaches the bottom of the cone 14, and the spring 33 pushes the cone 14 to reset, so that the cone 14 is pressed on the top of the boost slope 35 and the inner wall of the side of the buckle 5, and the handle 4 is auxiliary fixed, so that the handle 4 in this state is not easily rotated by external force without the user's active rotation.

[0030] In the present invention, a positioning pin 36 is fixedly connected to the inner wall at the top of the buckle 5, a pin hole is opened in the middle of the cone 14, and the bottom of the positioning pin 36 is inserted into the pin hole of the cone 14. When the cone 14 is inserted into the buckle 5, the positioning pin 36 is simultaneously inserted into the pin hole of the cone 14.

[0031] In the present invention, a boost slope 35 is fixedly connected to the inner wall at the bottom of the buckle 5. The side of the boost slope 35 close to the cone 14 is set as an arc surface. The width of the top of the boost slope 35 is smaller than the width of its bottom. When the handle 4 needs to be turned upward, the narrower top of the boost slope 35 first contacts the cone 14, applying a continuous upward pulling force to the handle 4. The arc surface of the boost slope 35 slides relative to the cone 14. As the cone 14 contacts the wider position of the boost slope 35, the pressure on the cone 14 gradually increases until the cone 14 is completely immersed in the storage hole 31, and the spring 33 contracts again. At this time, the boost slope 35 loses its obstruction, and then the buckle 5 leaves the cone 14, the handle 4 rotates upward smoothly, and the spring 33 pops out and resets the cone 14.

[0032] When in use, the cup cover 2 is placed on the top of the cup body 1 so that the two ends of the handle 4 are respectively located above the two movable grooves 10, and the handle 4 is turned so that the two lock buckles 9 cover the two movable grooves 10 respectively. In this process, the two locking points 13 are squeezed and deformed along the corresponding guide bevels 39 and respectively snapped into the two locking grooves 38. The two guide bevels 39 inside the same locking groove 38 position the snapped locking points 13 from both sides. When the cup cover 2 needs to be opened, the above operation is performed in reverse, and the handle 4 is turned upward, and the two locking points 13 are disengaged from the locking grooves 38. During the rotation of the handle 4, the coupling 15 and the crankshaft 23 rotate synchronously, and drive the connecting rod 22 to rotate eccentrically, and the closing plug 18 is lifted upward by the suspension rod 19, so that the height of the horizontal air hole 25 is higher than the height of the top of the ventilation pipe 17. At this time, the horizontal air hole 25 is connected to the top of the cup cover 2, and the longitudinal air hole 24 is connected to the cup body 1, thereby realizing the conduction between the cup body 1 and the outside atmosphere, preventing the cup cover 2 from being difficult to open under negative pressure conditions.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A combination structure of a hanging cup sealing cover, comprising a cup body (1) and a cup cover (2), wherein the cup cover (2) is arranged on the top of the cup body (1), and is characterized in that: The outer wall of the cup cover (2) is rotatably connected to a handle (4), and the bottoms of both ends of the handle (4) are fixedly connected to lock buckles (9). The tops of the outer walls of both sides of the cup body (1) are provided with movable grooves (10) adapted to the lock buckles (9), and the middle parts of the two lock buckles (9) on the sides close to each other are fixedly connected to locking points (13). The middle parts of the two movable grooves (10) are provided with locking grooves (38), and the inner walls of both sides of the two lock grooves (38) are provided with guiding inclined surfaces (39). Both sides of the cup cover (2) are rotatably connected to couplings (15), and the two sides of the couplings (15) that are far away from each other are fixedly connected to the two ends of the handle (4), respectively, and the sides of the two couplings (15) that are close to each other are fixedly connected to the same crankshaft ( 23), the middle part of the crankshaft (23) is rotatably connected to a connecting rod (22), the top of the connecting rod (22) is fixedly connected to a ball head (21), the outside of the ball head (21) is sleeved with a ball groove (20), the outer wall of the top of the ball groove (20) is fixedly connected to a suspension rod (19), the middle part of the cup cover (2) is plugged with a vent pipe (17), the inside of the vent pipe (17) is slidably connected to a closing plug (18), the bottom of the closing plug (18) is provided with four evenly distributed longitudinal air holes (24), the side of the closing plug (18) is provided with four evenly distributed transverse air holes (25), the four longitudinal air holes (24) are respectively connected to the four transverse air holes (25), and the suspension rod (19) is fixedly connected to the middle position of the bottom of the closing plug (18).

2. The combined structure of the hanging cup sealing cover according to claim 1, characterized in that: A protective sleeve (26) is fixedly connected to the middle position of the outer wall at the top of the cup cover (2), an opening is provided at the middle position of the top of the protective sleeve (26), and a filter screen (27) is fixedly connected to the inner wall of the opening at the top of the protective sleeve (26).

3. The combined structure of the hanging cup sealing cover according to claim 2, characterized in that: The outer wall of the protective sleeve (26) is circumferentially threadedly connected to a vent cap (12), and a circumferentially distributed vent holes (29) are formed on the side of the vent cap (12).

4. The combined structure of the hanging cup sealing cover according to claim 1, characterized in that: The outer walls on both sides of the cup cover (2) are fixedly connected to the limiting position points (7), and both ends of the handle (4) are fixedly connected to the limiting feet (8).

5. The combined structure of the hanging cup sealing cover according to claim 1, characterized in that: The outer wall at the top of the cup body (1) is provided with four rectangularly distributed slots (11); the outer wall at the bottom of the cup cover (2) is fixedly connected to a cover edge (3); the bottom of the cover edge (3) is fixedly connected to four rectangularly distributed lock buckles (9); the four lock buckles (9) are respectively locked in the inside of the four slots (11).

6. The combined structure of the hanging cup sealing cover according to claim 5, characterized in that: A clamping ring (30) is fixedly connected to the circumference of the inner wall of the cup cover (2), the bottom of the clamping ring (30) is clamped with a first sealing ring (16), and the bottom of the first sealing ring (16) is fitted to the top of the cup body (1).

7. The combined structure of the hanging cup sealing cover according to claim 6, characterized in that: A second sealing ring (37) is embedded at the top of the cup body (1), the top of the second sealing ring (37) is in contact with the bottom of the lid edge (3), and the inner diameter of the second sealing ring (37) is greater than the outer diameter of the first sealing ring (16).

8. The combined structure of the hanging cup sealing cover according to claim 1, characterized in that: A storage hole (31) is provided on one side of the cup cover (2); a clamping cone (14) is provided on one side of the storage hole (31) close to the outer wall of the cup cover (2); a telescopic rod (34) is fixedly connected to the middle part of the clamping cone (14) close to the inner wall of the cup cover (2); a limiting sleeve (32) is fixedly connected to the outer wall of the top of the clamping ring (30); the telescopic rod (34) is slidably connected to the inside of the limiting sleeve (32); a spring (33) is sleeved on the outside of the telescopic rod (34); two ends of the spring (33) are respectively fixedly connected to the limiting sleeve (32) and the clamping cone (14); a buckle (5) adapted to the clamping cone (14) is provided in the middle part of the handle (4); one end of the clamping cone (14) is inserted into the inside of the buckle (5).

9. The combined structure of the hanging cup sealing cover according to claim 8, characterized in that: A positioning pin (36) is fixedly connected to the inner wall of the top of the buckle (5), a pin hole is opened in the middle of the clamping cone (14), and the bottom of the positioning pin (36) is inserted into the pin hole of the clamping cone (14).

10. The combined structure of the hanging cup sealing cover according to claim 9, characterized in that: A boost slope (35) is fixedly connected to the inner wall of the bottom of the buckle (5); a side of the boost slope (35) close to the clamping cone (14) is arranged as an arc surface; and the width of the top of the boost slope (35) is smaller than the width of its bottom.

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