Medicine strip cutting system

Abstract

The invention relates to the technical field of initiating explosive devices, in particular to a medicine strip cutting-off system which comprises a medicine strip cutting-off device, the medicine strip cutting-off device comprises a frame body, a cutter structure, a power piece and a transmission mechanism, and the power piece and the transmission mechanism are both arranged on the frame body. The upper cutting blade and the lower cutting blade are moved and separated, and a cutting edge is formed between the two cutting edges which are closest to each other; then the medicine strip is conveyed to the shearing knife edge from top to bottom, and the lower end of the medicine strip penetrates through the shearing knife edge and is held by a worker; and finally, the power piece is controlled to work again, the upper cutting blade and the lower cutting blade move to be close to each other, the medicine strip is cut off under the action of the cutting edges of the upper cutting blade and the lower cutting blade, and therefore the cutting work of a section of medicine strip is completed. Compared with the prior art that the medicine strips are cut off manually, the labor intensity is remarkably reduced, the requirement for personnel is lowered, the cutting-off efficiency is improved, and automatic production is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of explosive devices, and in particular to a powder strip cutting system. Background Art

[0002] During the production process of medicine strips, the medicine strips need to be cut into fixed-length strips and dried in accordance with the production process requirements, and then the next processing step can be carried out after drying.

[0003] At present, the method of cutting the medicine strips is: the formed medicine strips are cut by manually grasping and visually measuring the length, and then the medicine strips are cut on the chopping board with a kitchen knife, and then the cut medicine strips are simply combed and bundled, and then placed on the conveyor belt to be transferred to the next process for drying. This method has high labor intensity and low cutting efficiency, which is not conducive to automated production. Summary of the invention

[0004] The technical problem solved by the invention is to provide a medicine strip cutting system which has low labor intensity, high efficiency and is conducive to automated production.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a medicine strip cutting system, including a medicine strip cutting device, the medicine strip cutting device includes a frame, a cutter structure, a power member and a transmission mechanism, the power member and the transmission mechanism are both arranged on the frame;

[0006] The cutter structure includes two cutting blades, and the cutting blade includes a shearing main body. At least one of the front and rear ends of the shearing main body is provided with a connecting part. The left and right sides of the shearing main body are respectively provided with blades, and the blades are arranged along the length direction of the shearing main body. The two cutting blades are respectively an upper cutting blade and a lower cutting blade. The upper cutting blade and the lower cutting blade are respectively arranged on the transmission mechanism through the connecting part, and the upper cutting blade and the lower cutting blade are arranged in parallel up and down. The power member can make the upper cutting blade and the lower cutting blade reciprocate through the transmission mechanism. When the upper cutting blade and the lower cutting blade move closer, a shearing edge is formed between the two blades of the upper cutting blade and the lower cutting blade that are closest to each other.

[0007] Furthermore, the transmission mechanism includes a synchronous pulley and a synchronous belt. The left and right sides of the frame are respectively rotatably provided with synchronous pulleys. The synchronous belt is matched with the synchronous pulleys. The upper cutting blade and the lower cutting blade are both arranged on the synchronous belt, and the upper cutting blade and the lower cutting blade are both perpendicular to the synchronous belt.

[0008] Furthermore, the synchronous belt comprises a left belt body, a right belt body, an upper slider seat and a lower slider seat which are enclosed and connected in sequence, the left belt body is sleeved on the left synchronous belt pulley, the right belt body is sleeved on the right synchronous belt pulley, the upper cutting blade is vertically connected to the upper slider seat, and the upper cutting blade is vertically connected to the lower slider seat;

[0009] The power part is a gas-liquid booster cylinder, and the piston rod of the gas-liquid booster cylinder is connected with the upper slider seat or the lower slider seat through a slider connecting block.

[0010] Furthermore, the frame is provided with slide rails in left and right directions, and the upper slide block seat and the lower slide block seat are respectively provided on one slide rail;

[0011] The left and right sides of the upper slider seat are respectively connected to the left belt body and the right belt body through the first U-shaped connecting block, and the left and right sides of the lower slider seat are respectively connected to the left belt body and the right belt body through the second U-shaped connecting block.

[0012] Furthermore, there are two groups of transmission mechanisms, which are arranged parallel to each other on the front and rear sides of the frame body, and the front and rear ends of the shearing main body are respectively provided with connecting parts, and the front and rear ends of the upper cutting blade are respectively connected to the upper slider seats of the two groups of transmission mechanisms, and the front and rear ends of the lower cutting blade are respectively connected to the lower slider seats of the two groups of transmission mechanisms;

[0013] The synchronous pulleys of the two transmission mechanisms are connected together through two synchronous rotating shafts.

[0014] Furthermore, buffer limiters are respectively arranged on the left and right sides of the frame.

[0015] Furthermore, the shape of the cutting blade is an axisymmetric figure.

[0016] Furthermore, the width of the upper surface of the shearing body of the upper cutting blade is smaller than the width of the lower surface thereof, and the blade of the upper cutting blade is arranged at the edge of the lower surface of the shearing body;

[0017] The width of the upper surface of the shearing main body of the lower cutting blade is greater than the width of the lower surface thereof, and the blade edge of the lower cutting blade is arranged at the edge of the upper surface of the shearing main body.

[0018] Furthermore, it also includes a controller, which is electrically connected to the power component.

[0019] Furthermore, it also includes a medicine strip guide sleeve, which is arranged above the medicine strip cutting device;

[0020] The medicine strip guiding sleeve comprises a frustum portion which is larger at the top and smaller at the bottom and a cylindrical portion, wherein the frustum portion is arranged above the cylindrical portion.

[0021] The beneficial effects of the present invention are as follows: the medicine strip cutting system comprises a medicine strip cutting device, the medicine strip cutting device comprises a frame, a cutter structure, a power member and a transmission mechanism, and the power member and the transmission mechanism are both arranged on the frame; the process flow of using the medicine strip cutting system to cut the medicine strip is as follows: firstly, the power member is controlled to work, so that the upper cutting blade and the lower cutting blade are moved apart, and a shearing edge is formed between the two closest blades; then the medicine strip is transported from top to bottom to the shearing edge, and the lower end of the medicine strip passes through the shearing edge and is held by the staff; finally, the power member is controlled to work again, so that the upper cutting blade and the lower cutting blade are moved closer, and the blades of the upper cutting blade and the lower cutting blade contact the medicine strip, and the medicine strip is sheared and cut under the action of the blades of the upper cutting blade and the lower cutting blade, thereby completing the cutting work of a section of the medicine strip. Compared with the prior art of manually cutting the medicine strip, the labor intensity is significantly reduced, the requirements for personnel are reduced, the cutting efficiency is improved, and it is conducive to automated production. In addition, the cutting blade of the present invention is provided with blades on the left and right sides respectively, and the upper cutting blade and the lower cutting blade can complete the cutting work of two sections of medicine strips by one reciprocating movement, further improving the cutting efficiency of medicine strips. A controller is also provided, and the controller is electrically connected to the power part, and the controller automatically controls the power part to work, further reducing the labor intensity and facilitating large-scale use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the front view of the medicine strip cutting device;

[0023] Figure 2 is a top view schematic diagram of a medicine strip cutting device;

[0024] Figure 3 It is a schematic diagram of the front view of the cutter structure;

[0025] Figure 4 is a top view schematic diagram of a cutting blade;

[0026] Figure 5 yes Figure 4 A schematic cross-sectional view along the middle line AA;

[0027] Figure 6 is a schematic side view of a cutting blade;

[0028] Figure 7 It is a schematic diagram of the medicine strip cutting system;

[0029] Marked as: frame 1, cutting knife structure 2, upper cutting blade 21, lower cutting blade 22, shearing body 23, connecting part 24, blade 25, power part 3, transmission mechanism 4, synchronous pulley 41, synchronous belt 42, left belt body 421, right belt body 422, upper slider seat 423, lower slider seat 424, first U-shaped connecting block 425, second U-shaped connecting block 426, slider connecting block 43, buffer limiter 5, medicine strip guide sleeve 6, synchronous rotating shaft 7, pressing and stretching machine 8. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] The following refers to the location Figure 2 The position of each component in the figure is taken as the reference.

[0032] like Figures 1 to 7 As shown, the medicine strip cutting system of the present invention comprises a medicine strip cutting device, which comprises a frame 1, a cutter structure 2, a power member 3 and a transmission mechanism 4, wherein the power member 3 and the transmission mechanism 4 are both arranged on the frame 1;

[0033] The cutter structure 2 includes two cutting blades, and the cutting blade includes a shearing main body 23. At least one of the front and rear ends of the shearing main body 23 is provided with a connecting portion 24. The left and right sides of the shearing main body 23 are respectively provided with blades 25, and the blades 25 are arranged along the length direction of the shearing main body 23. The two cutting blades are an upper cutting blade 21 and a lower cutting blade 22. The upper cutting blade 21 and the lower cutting blade 22 are respectively arranged on the transmission mechanism 4 through the connecting portion 24, and the upper cutting blade 21 and the lower cutting blade 22 are arranged in parallel up and down. The power member 3 can make the upper cutting blade 21 and the lower cutting blade 22 reciprocate through the transmission mechanism 4. When the upper cutting blade 21 and the lower cutting blade 22 move closer, a shearing edge is formed between the two closest blades 25 of the upper cutting blade 21 and the lower cutting blade 22.

[0034] The process flow of cutting medicine strips using the medicine strip cutting system is as follows: in the initial state, the upper cutting blade 21 and the lower cutting blade 22 overlap each other, and the power member 3 is first controlled to work so that the upper cutting blade 21 and the lower cutting blade 22 move apart, forming a shearing edge between the two closest blades 25; then the medicine strip is transported from top to bottom to the shearing edge, and the lower end of the medicine strip passes through the shearing edge and is held by the staff; finally, the power member 3 is controlled to work again so that the upper cutting blade 21 and the lower cutting blade 22 move closer together, and the blades of the upper cutting blade 21 and the lower cutting blade 22 contact the medicine strip, and the medicine strip is sheared and cut under the action of the blades of the upper cutting blade 21 and the lower cutting blade 22, thereby completing the cutting work of a section of the medicine strip.

[0035] Specifically, the function of the transmission mechanism 4 is to transmit power to the upper cutting blade 21 and the lower cutting blade 22, so that the upper cutting blade 21 and the lower cutting blade 22 can reciprocate to cut the medicine strip. In order to ensure the use effect of the transmission mechanism 4, a preferred structure of the transmission mechanism 4 of the present invention is: Figure 1 , Figure 2As shown, the transmission mechanism 4 includes a synchronous pulley 41 and a synchronous belt 42. The synchronous pulleys 41 are rotatably arranged on the left and right sides of the frame 1, respectively. The synchronous belt 42 is matched and mounted on the synchronous pulley 41. The upper cutting blade 21 and the lower cutting blade 22 are both arranged on the synchronous belt 42, and the upper cutting blade 21 and the lower cutting blade 22 are both perpendicular to the synchronous belt 42. With the transmission mechanism 4, the power part can be a motor. The rotation of the motor drives the synchronous pulley 41 to rotate. The rotation of the synchronous pulley 41 drives the synchronous belt 42 to reciprocate. The working principle is the same as that of the belt conveyor. The reciprocating movement of the synchronous belt 42 drives the upper cutting blade 21 and the lower cutting blade 22 to reciprocate.

[0036] Since the upper cutting blade 21 and the lower cutting blade 22 are made of steel, the synchronous belt 42 is also required to give the upper cutting blade 21 and the lower cutting blade 22 sufficient force when the medicine strip is cut. The effect of using a motor as a power part is not very good. In order to improve the shearing and cutting effect of the upper cutting blade 21 and the lower cutting blade 22, Figure 1 , Figure 2 As shown, the synchronous belt 42 includes a left belt body 421, a right belt body 422, an upper slider seat 423 and a lower slider seat 424 which are enclosed and connected together in sequence, the left belt body 421 is mounted on the left synchronous belt pulley 41, the right belt body 422 is mounted on the right synchronous belt pulley 41, the upper cutting blade 21 is vertically connected to the upper slider seat 423, and the upper cutting blade 21 is vertically connected to the lower slider seat 424; the power part 3 is a gas-liquid booster cylinder, and the piston rod of the gas-liquid booster cylinder is connected to the upper slider seat 423 or the lower slider seat 424 through the slider connecting block 43.

[0037] In order to explain its working principle conveniently, the piston rod of the gas-liquid booster cylinder is described by taking the slider connecting block 43 and the upper slider seat 423 as an example. When the piston rod of the gas-liquid booster cylinder is extended (the piston rod moves to the left), the slider connecting block 43 is driven to move to the left, and the slider connecting block 43 drives the upper slider seat 423 to move to the left. The upper slider seat 423 moves to the left and drives the upper cutting blade 21 to move to the left. At the same time, the entire synchronous belt 42 rotates counterclockwise around the synchronous belt pulley 41, so that the lower slider seat 424 moves to the right at the same time, and the lower slider seat 424 moves to the right and drives the lower cutting blade 22 to move to the right, that is, the upper cutting blade 21 and the lower cutting blade 22 move apart, and a shearing edge is formed between the two closest blades 25. When the medicine strip is transported from top to bottom to the shearing edge, the medicine strip is After the lower end of the medicine strip passes through the shearing edge and is held by the staff, the piston rod of the gas-liquid booster cylinder retracts (the piston rod moves to the right), driving the slider connecting block 43 to move to the right, and the slider connecting block 43 drives the upper slider seat 423 to move to the right, and the upper slider seat 423 moves to the right and drives the upper cutting blade 21 to move to the right. At the same time, the entire synchronous belt 42 rotates clockwise around the synchronous pulley 41, causing the lower slider seat 424 to move to the left at the same time, and the lower slider seat 424 moves to the left and drives the lower cutting blade 22 to move to the left, so that the upper cutting blade 21 and the lower cutting blade 22 move closer, and the blades of the upper cutting blade 21 and the lower cutting blade 22 contact the medicine strip, and the medicine strip is sheared and cut under the action of the blades 25 of the upper cutting blade 21 and the lower cutting blade 22, thereby completing the cutting work of a section of medicine strip. Since the left and right sides of the cutting blade are respectively provided with blades 25, the piston rod of the gas-liquid booster cylinder continues to retract (the piston rod moves to the right), driving the slider connecting block 43 to move to the right, and the slider connecting block 43 drives the upper slider seat 423 to move to the right, and the upper slider seat 423 moves to the right and drives the upper cutting blade 21 to move to the right. At the same time, the entire synchronous belt 42 rotates clockwise around the synchronous belt pulley 41, so that the lower slider seat 424 moves to the left at the same time, and the lower slider seat 424 moves to the left and drives the lower cutting blade 22 to move to the left, that is, the upper cutting blade 21 and the lower cutting blade 22 move apart, forming a shearing edge between the two closest blades 25, and after the medicine strip is transported from top to bottom to the shearing edge, the lower end of the medicine strip passes through the shearing edge and is held by the staff, the gas-liquid booster cylinder The piston rod extends (the piston rod moves to the left), driving the slider connecting block 43 to move to the left, and the slider connecting block 43 drives the upper slider seat 423 to move to the left, and the upper slider seat 423 moves to the left and drives the upper cutting blade 21 to move to the left. At the same time, the entire synchronous belt 42 rotates counterclockwise around the synchronous pulley 41, causing the lower slider seat 424 to move to the right at the same time, and the lower slider seat 424 moves to the right and drives the lower cutting blade 22 to move to the right, so that the upper cutting blade 21 and the lower cutting blade 22 move closer, and the blades of the upper cutting blade 21 and the lower cutting blade 22 contact the medicine strip, and the medicine strip is sheared and cut off under the action of the blades 25 of the upper cutting blade 21 and the lower cutting blade 22, thereby completing the cutting work of the next section of the medicine strip. At this time, the upper cutting blade 21 and the lower cutting blade 22 overlap up and down and return to the initial state.This arrangement enables the gas-liquid booster cylinder to drive the upper cutting blade 21 and the lower cutting blade 22 to move back and forth once to complete the cutting of two sections of the medicine strip, further improving the efficiency of the medicine strip cutting, facilitating the operation of the gas-liquid booster cylinder, and facilitating automatic control.

[0038] The gas-liquid booster cylinder can be a gas cylinder or an oil cylinder, preferably a gas cylinder.

[0039] In order to facilitate the connection between the upper slider seat 423, the lower slider seat 424 and the left belt body 421 and the right belt body 422, Figure 1 As shown, the left and right sides of the upper slider seat 423 are connected to the left belt body 421 and the right belt body 422 respectively through the first U-shaped connecting block 425, and the left and right sides of the lower slider seat 424 are connected to the left belt body 421 and the right belt body 422 respectively through the second U-shaped connecting block 426.

[0040] In order to reduce the possibility of deviation of the upper slider seat 423 and the lower slider seat 424 during reciprocating movement, left and right slide rails are provided on the frame 1, and the upper slider seat 423 and the lower slider seat 424 are respectively provided on one slide rail.

[0041] In order to further improve the stability of the entire device and ensure the use effect, Figure 1 , Figure 2 As shown, there are two groups of transmission mechanisms 4, which are arranged parallel to each other on the front and rear sides of the frame 1, and the front and rear ends of the shearing main body 23 are respectively provided with connecting parts 24, and the front and rear ends of the upper cutting blade 21 are respectively connected to the upper slider seats 423 of the two groups of transmission mechanisms 4, and the front and rear ends of the lower cutting blade 22 are respectively connected to the lower slider seats 424 of the two groups of transmission mechanisms 4; the synchronous pulleys 41 of the two groups of transmission mechanisms 4 are connected together through two synchronous rotating shafts 7. Under the action of the synchronous rotating shaft 7, the two groups of transmission mechanisms 4 act synchronously, thereby effectively improving the use stability of the entire device and the shearing and cutting effect of the cutter structure 2.

[0042] In order to protect the cutter structure and ensure that the cutter structure moves back and forth within a limited position range, buffer limiters 5 are respectively arranged on the left and right sides of the frame 1. The front section of the buffer limiter 5 is composed of a spring, and the rear section is composed of a thread. Buffering of different distances can be achieved by adjusting the position of the nut.

[0043] In order to further reduce the labor intensity and improve the efficiency of cutting the medicine strips, the present invention is also provided with a controller, which is electrically connected to the power member 3, and the controller automatically controls the operation of the power member. Some photoelectric sensors can also be provided to detect the position of each moving part to improve the level of automation.

[0044] Since the medicine strip is columnar, the medicine strip is transported from top to bottom to the shearing blade. In order to facilitate the lower end of the medicine strip to pass through the shearing blade and improve the use effect of the cutter structure, the width of the upper surface of the shearing body 23 of the upper cutting blade 21 is smaller than the width of its lower surface, and the blade 25 of the upper cutting blade 21 is arranged on the edge of the lower surface of the shearing body 23; the width of the upper surface of the shearing body 23 of the lower cutting blade 22 is larger than the width of its lower surface, and the blade 25 of the lower cutting blade 22 is arranged on the edge of the upper surface of the shearing body 23, and the upper and lower surfaces of the shearing body 23 are both rectangular. Measures to further improve the use effect of the cutter structure include: the blade 25 is an inwardly concave arc, the shape of the cutting blade is an axisymmetric figure, and the hardness of the blade 25 is HRC57-63.

[0045] The cutting blades are usually connected and fixed by bolts. In order to prevent the bolts from affecting the use of the upper cutting blade 21 and the lower cutting blade 22, a countersunk hole 26 for connection is provided on the connecting portion 24.

[0046] In order to facilitate the delivery of the medicine strips squeezed out from the pressing and stretching machine 8 to the shearing edge, Figure 7 As shown, the present invention is further provided with a medicine strip guide sleeve 6, which is arranged above the medicine strip cutting device and below the outlet of the press and stretch machine 8. The medicine strip guide sleeve 6 includes a frustum portion that is larger at the top and smaller at the bottom and a cylindrical portion, and the frustum portion is arranged above the cylindrical portion. The medicine strip guide sleeve 6 plays a guiding role.

[0047] In summary, compared with the prior art of manually cutting off medicine strips, the labor intensity is significantly reduced, the requirements for personnel are reduced, the cutting efficiency is improved, and automated production is facilitated.

Claims

1. Medicine strip cutting system, Features: The medicine strip cutting device comprises a frame (1), a cutting knife structure (2), a power member (3) and a transmission mechanism (4), wherein the power member (3) and the transmission mechanism (4) are both arranged on the frame (1); The cutter structure (2) comprises two cutting blades, the cutting blades comprising a cutting body (23), at least one of the front and rear ends of the cutting body (23) being provided with a connecting portion (24), the left and right sides of the cutting body (23) being provided with blades (25), respectively, the blades (25) being provided along the length direction of the cutting body (23), the two cutting blades being respectively an upper cutting blade (21) and a lower cutting blade (22), the upper cutting blade (21) and the lower cutting blade (22) being respectively provided on a transmission mechanism (4) through the connecting portion (24), and the upper cutting blade (21) and the lower cutting blade (22) being provided in parallel up and down, the power member (3) being able to make the upper cutting blade (21) and the lower cutting blade (22) reciprocate through the transmission mechanism (4), and when the upper cutting blade (21) and the lower cutting blade (22) move closer together, a cutting edge is formed between the two blades (25) closest to each other in the upper cutting blade (21) and the lower cutting blade (22).

2. The medicine strip cutting system according to claim 1, Features: The transmission mechanism (4) comprises a synchronous pulley (41) and a synchronous belt (42). The synchronous pulleys (41) are rotatably arranged on the left and right sides of the frame (1), and the synchronous belt (42) is matched and sleeved on the synchronous pulleys (41). The upper cutting blade (21) and the lower cutting blade (22) are both arranged on the synchronous belt (42), and the upper cutting blade (21) and the lower cutting blade (22) are both perpendicular to the synchronous belt (42).

3. The medicine strip cutting system according to claim 2, Features: The synchronous belt (42) comprises a left belt body (421), a right belt body (422), an upper slider seat (423) and a lower slider seat (424) which are enclosed and connected in sequence. The left belt body (421) is sleeved on the left synchronous belt pulley (41), the right belt body (422) is sleeved on the right synchronous belt pulley (41), the upper cutting blade (21) is vertically connected to the upper slider seat (423), and the upper cutting blade (21) is vertically connected to the lower slider seat (424); The power member (3) is a gas-liquid booster cylinder, and the piston rod of the gas-liquid booster cylinder is connected to the upper slider seat (423) or the lower slider seat (424) through a slider connecting block (43).

4. The medicine strip cutting system according to claim 3, Features: The frame (1) is provided with slide rails in left and right directions, and the upper slide block seat (423) and the lower slide block seat (424) are respectively arranged on one slide rail; The left and right sides of the upper slider seat (423) are connected to the left belt body (421) and the right belt body (422) respectively through a first U-shaped connecting block (425), and the left and right sides of the lower slider seat (424) are connected to the left belt body (421) and the right belt body (422) respectively through a second U-shaped connecting block (426).

5. The medicine strip cutting system according to claim 3, Features: There are two groups of transmission mechanisms (4), which are arranged parallel to each other on the front and rear sides of the frame (1); the front and rear ends of the shearing main body (23) are respectively provided with connecting parts (24); the front and rear ends of the upper cutting blade (21) are respectively connected to the upper slider seats (423) of the two groups of transmission mechanisms (4); and the front and rear ends of the lower cutting blade (22) are respectively connected to the lower slider seats (424) of the two groups of transmission mechanisms (4); The synchronous pulleys (41) of the two sets of transmission mechanisms (4) are connected together via two synchronous rotating shafts (7).

6. The medicine strip cutting system according to claim 1, Features: Buffer limiters (5) are respectively arranged on the left and right sides of the frame body (1).

7. The medicine strip cutting system according to claim 1, Features: The shape of the cutting blade is an axisymmetric figure.

8. The medicine strip cutting system according to claim 7, Features: The width of the upper surface of the shearing body (23) of the upper cutting blade (21) is smaller than the width of the lower surface thereof, and the blade (25) of the upper cutting blade (21) is arranged at the edge of the lower surface of the shearing body (23); The width of the upper surface of the shearing body (23) of the lower cutting blade (22) is greater than the width of the lower surface thereof, and the blade (25) of the lower cutting blade (22) is arranged on the edge of the upper surface of the shearing body (23).

9. The medicine strip cutting system according to claim 1, Features: It also includes a controller, which is electrically connected to the power part (3).

10. The medicine rod cutting system according to claim 1, Features: It also includes a medicine strip guide sleeve (6), which is arranged above the medicine strip cutting device; The medicine strip guide sleeve (6) comprises a frustum portion which is larger at the top and smaller at the bottom and a cylindrical portion, wherein the frustum portion is arranged above the cylindrical portion.

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