Winch

Abstract

The invention relates to the technical field of engineering machinery, in particular to a winch which comprises a machine body, a guide component arranged on the machine body and a limiting component arranged on the guide component. The machine body comprises a rotating shaft, a winding drum arranged on the rotating shaft and a cable arranged on the winding drum; the guide component comprises a hollow seat arranged on the machine body, a guide column arranged on the hollow seat, a guide seat arranged on the guide column in a sliding mode, and a connecting assembly arranged in the hollow seat. The force on the same horizontal line is kept all the time, the cable is prevented from inclining and deviating due to the force in different directions, the deviated cable is prevented from scratching a winding drum, the cable is limited when winding of the winding drum is finished, and the situation that when the cable is dragged, the cable pulls the winding drum, the winding drum rotates reversely, and then a motor in the machine body is damaged is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a winch. Background Art

[0002] A winch is a piece of mechanical equipment widely used in various industries. It is mainly used to lift or move heavy objects. When treating water bodies, the winch is used to dynamically adjust the trash can according to changes in water levels during operation. The winch consists of a motor, cables, a drum, and a base. By controlling the cable on the winch to connect to the trash can, the stability of the trash can is maintained to prevent the trash can from tilting or shifting when the water flow is turbulent.

[0003] Since the water flow rate is uncontrollable, when the water flow is turbulent, the trash can and the cable will tilt and shift at the same time. The shifted cable may form indentations or scratches on the reel, affecting the smoothness and effectiveness of the reel. The shift of the cable on the reel may cause uneven twist, further increasing the risk of damage to the material on the outside of the reel, and the reel needs to be replaced. Summary of the invention

[0004] In view of the above problems existing in the existing winches, the present invention is proposed.

[0005] Therefore, the present invention provides a winch, the purpose of which is to solve the technical problem that the offset cable will increase the damage to the material on the outer side of the drum.

[0006] In order to solve the above technical problems, the present invention provides the following technical solution: comprising a machine body, a guide component arranged on the machine body, and a limit component arranged on the guide component;

[0007] The machine body comprises a rotating shaft, a reel arranged on the rotating shaft, and a cable arranged on the reel;

[0008] The guide component includes a hollow seat arranged on the body, a guide column arranged on the hollow seat, a guide seat slidably arranged on the guide column, a connecting component arranged in the hollow seat, a one-way component arranged in the hollow seat, a disengagement component arranged in the hollow seat, and a reset component arranged in the hollow seat;

[0009] The limiting component includes a rotating shaft rotatably arranged on the guide seat, an extrusion wheel arranged outside the rotating shaft, and a synchronous adjustment component arranged on the guide seat.

[0010] As a preferred solution of the winch described in the present invention, the guide component also includes a screw rod rotatably set on a hollow seat, the guide seat is threadedly connected to the screw rod, a positioning hole is set on the guide seat, and the cable is slidably set on the positioning hole.

[0011] As a preferred solution of the winch described in the present invention, wherein: the connecting component includes a pulley 1 arranged on the outside of the rotating shaft, a pulley 2 is arranged on the outside of the screw rod, the pulley 2 is connected to the screw rod through a bearing, and the pulley 1 and the pulley 2 are connected through a transmission belt.

[0012] As a preferred solution of the winch described in the present invention, the one-way component includes a ratchet arranged on the screw rod, a reset shaft is rotatably arranged on the second pulley, a pawl is arranged on the outer side of the reset shaft, the reset shaft and the pawl are connected by a torsion spring, and the ratchet and the pawl are meshed with each other.

[0013] As a preferred solution of the winch described in the present invention, the disengagement component includes a fixed disk arranged on the second pulley, a guide groove is arranged on the outer side of the screw rod, a sliding ring is slidably arranged on the guide groove, and a plurality of matching blocks are arranged on the corresponding surfaces of the sliding ring and the fixed disk.

[0014] As a preferred solution of the winch described in the present invention, the ends of the plurality of matching blocks are all wedge-shaped, and the sliding ring and the fixed plate are adapted to each other.

[0015] As a preferred solution of the winch described in the present invention, the reset assembly includes a rotating disk rotatably arranged on a sliding ring, a spring is arranged on the outer side of the screw rod, and two ends of the spring are respectively connected to corresponding surfaces of the rotating disk and the hollow seat.

[0016] As a preferred solution of the winch described in the present invention, wherein: the limiting component also includes an inclined groove arranged on the guide seat, an L-shaped rod is slidably arranged on the inclined groove, and a matching wheel is arranged on the L-shaped rod.

[0017] As a preferred solution of the winch described in the present invention, the extrusion wheel and the matching wheel are adapted to each other, and the end of the L-shaped rod is wedge-shaped.

[0018] As a preferred solution of the winch described in the present invention, the synchronous adjustment component includes a synchronous block rotatably set on a sliding ring, the synchronous block is slidably set on a guide column, an extrusion cylinder is set on the synchronous block, the interior of the extrusion cylinder is wedge-shaped, and the L-shaped rod and the extrusion cylinder are adapted to each other.

[0019] The beneficial effects of the present invention are as follows: through the cooperation of the guide component and the limit component, when the cables are arranged on the surface of the drum, a force on a horizontal line is always maintained, preventing the cables from being tilted or offset due to forces in different directions. The offset cables cause scratches on the drum. When the drum is wound up, the cables are limited to prevent the cables from pulling the drum when being dragged, causing the drum to rotate in the opposite direction, thereby causing damage to the motor in the machine body. The technical problem that the offset cables will increase the damage to the material on the outside of the drum is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the winch of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the guide component of the winch of the present invention.

[0023] Figure 3 It is a schematic diagram of the structure of the connecting assembly of the winch of the present invention.

[0024] Figure 4 It is a schematic diagram of the one-way component structure of the winch of the present invention.

[0025] Figure 5 It is a schematic diagram of the structure of the synchronous adjustment component of the winch of the present invention.

[0026] Figure 6 It is a schematic diagram of the structure of the disengagement component of the winch of the present invention.

[0027] Figure 7 It is a schematic diagram of the structure of the reset component of the winch of the present invention. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0031] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0032] Example 1, reference Figure 1-Figure 5 , which is the first embodiment of the present invention, provides a winch, the device includes a body 100, a guide component 200 disposed on the body 100, and a limit component 300 disposed on the guide component 200;

[0033] The machine body 100 includes a rotating shaft 101, a reel 102 disposed on the rotating shaft 101, and a cable 103 disposed on the reel 102. The cable 103 is wound on the surface of the reel 102. The machine body 100 drives the rotating shaft 101 to rotate, and the rotating shaft 101 drives the reel 102 to rotate synchronously. At the same time, the reel 102 rotates to reel the cable 103.

[0034] The guide component 200 includes a hollow seat 201 disposed on the body 100, a guide column 202 disposed on the hollow seat 201, a guide seat 203 slidably disposed on the guide column 202, the guide column 202 is used to guide the guide seat 203, a connecting component 206 disposed in the hollow seat 201, a one-way component 207 disposed in the hollow seat 201, a disengagement component 208 disposed in the hollow seat 201, and a reset component 209 disposed in the hollow seat 201;

[0035] The limiting component 300 includes a rotating shaft 301 rotatably disposed on the guide seat 203 , an extruding wheel 302 disposed outside the rotating shaft 301 , and a synchronous adjustment component 306 disposed on the guide seat 203 .

[0036] The guide component 200 also includes a screw rod 204 rotatably set on the hollow seat 201, the guide seat 203 is threadedly connected to the screw rod 204, a positioning hole 205 is set on the guide seat 203, the cable 103 is slidably set on the positioning hole 205, and a chamfer is set at the edge of the positioning hole 205. The chamfer at the edge of the positioning hole 205 is used to reduce the friction with the cable 103, and the sliding direction of the cable 103 is guided by the positioning hole 205, so that when the cable 103 is subjected to forces in different directions, it is guided by the positioning hole 205, so that the cable 103 wound on the outside of the reel 102 always maintains a force in one direction. When the screw rod 204 rotates, the guide seat 203 slides along the thread direction of the screw rod 204, and then cooperates with the guide column 202 for guidance, so that the guide seat 203 slides along the guide column 202.

[0037] During use, when the body 100 drives the shaft 101 to rotate, the shaft 101 drives the reel 102 to rotate synchronously, and the reel 102 drives the cable 103 to wrap around its surface. When the cable 103 is wound, it slides along the positioning hole 205, so that the force of the cable 103 pulling the reel 102 is kept on a horizontal line.

[0038] Example 2, reference Figure 1-Figure 7 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the connecting component 206 includes a pulley 1 206a arranged on the outside of the rotating shaft 101, and a pulley 2 206b is arranged on the outside of the screw rod 204. The pulley 206b is connected to the screw rod 204 through a bearing, and the pulley 1 206a and the pulley 2 206b are connected through a transmission belt 206c. The pulley 1 206a and the pulley 2 206b are driven to rotate synchronously through the connecting component 206. When the rotating shaft 101 rotates, the rotating shaft 101 drives the pulley 1 206a to rotate synchronously, and the pulley 1 206a drives the pulley 2 206b to rotate synchronously through the transmission belt 206c. Because the pulley 2 206b is connected to the screw rod 204 through a bearing, the pulley 2 206b rotates idly.

[0039] Furthermore, the one-way component 207 includes a ratchet 207a arranged on the screw rod 204, a reset shaft 207b is rotatably arranged on the second pulley 206b, a pawl 207c is arranged on the outer side of the reset shaft 207b, the reset shaft 207b is connected to the pawl 207c by a torsion spring, the ratchet 207a and the pawl 207c are meshed with each other, and the one-way component 207 makes the screw rod 204 rotate when the ratchet 207a and the pawl 207c cooperate, and when the second pulley 206b rotates in the opposite direction, the pawl 207c on the second pulley 206b rotates synchronously, the pawl 207c drives the ratchet 207a to rotate synchronously, the ratchet 207a drives the screw rod 204 to rotate synchronously, and when the screw rod 204 rotates, the screw rod 204 drives the guide seat 203 to slide along the direction of the guide column 202.

[0040] Furthermore, the disengagement assembly 208 includes a fixed disk 208a disposed on the second pulley 206b, a guide groove 208b is disposed on the outer side of the screw rod 204, a sliding ring 208c is slidably disposed on the guide groove 208b, and a plurality of matching blocks 208d are disposed on the corresponding surfaces of the sliding ring 208c and the fixed disk 208a. The disengagement assembly 208 drives the matching blocks 208d to cooperate, so that the first pulley 206a and the screw rod 204 rotate synchronously. When the sliding ring 208c slides along the guide groove 208b, The matching block 208d on the sliding ring 208c is matched with the matching block 208d on the fixed disk 208a. When the pulley 206b rotates, the fixed disk 208a rotates synchronously with it. The matching block 208d on the fixed disk 208a squeezes the matching block 208d on the sliding ring 208c, so that the sliding ring 208c rotates synchronously. The sliding ring 208c squeezes the guide groove 208b, and the guide groove 208b drives the screw rod 204 to rotate synchronously, thereby making the screw rod 204 and the pulley 206b rotate synchronously.

[0041] Furthermore, the ends of the multiple matching blocks 208d are all wedge-shaped, the sliding ring 208c and the fixed plate 208a are adapted to each other, and the ends of the matching blocks 208d are wedge-shaped to facilitate mutual matching and reduce mutual interference.

[0042] Furthermore, the reset component 209 includes a rotating disk 209a rotatably set on the sliding ring 208c, and a spring 209b is set on the outside of the screw rod 204, and the two ends of the spring 209b are respectively connected to the corresponding surfaces of the rotating disk 209a and the hollow seat 201, and the matching block 208d on the sliding ring 208c of the reset component 209 is adapted to the matching block 208d on the fixed disk 208a, so that the sliding ring 208c is reset, and the elasticity of the spring 209b drives the rotating disk 209a to squeeze the sliding ring 208c, and the sliding ring 208c slides along the guide groove 208b and is adapted to the matching block 208d on the fixed disk 208a, so that the screw rod 204 and the pulley 2 206b rotate synchronously.

[0043] The remaining structures are the same as those of Example 1.

[0044] During use, when the machine body 100 drives the rotating shaft 101 to rotate, the rotating shaft 101 drives the pulley 1 206a to rotate synchronously, and the pulley 1 206a drives the pulley 2 206b to rotate synchronously through the transmission belt 206c. Because the pulley 206b is connected to the screw rod 204 through the bearing, the pulley 206b rotates idly. When the pulley 1 206a rotates in the opposite direction, the pulley 206b rotates in the opposite direction synchronously, and the ratchet 207c on the pulley 206b rotates synchronously, and the ratchet 207c drives the ratchet 207a to rotate synchronously. The ratchet 207a drives the screw rod 204 to rotate synchronously. When the screw rod 204 rotates, the screw rod 204 drives the guide seat 203 to slide along the direction of the guide column 202. At this time, the reel 102 arranges the cable 103 on its surface. The guide seat 203 is displaced through the transmission of the screw rod 204 and guided by the positioning hole 205. When the cable 103 is arranged on the surface of the reel 102, a horizontal force is always maintained to prevent the cable 103 from tilting and deviating. The deviated cable 103 causes indentations or scratches on the reel 102.

[0045] Example 3, reference Figure 1-7 , is a third embodiment of the present invention, which is different from the second embodiment in that: the limiting component 300 also includes an inclined groove 303 arranged on the guide seat 203, an L-shaped rod 304 is slidably arranged on the inclined groove 303, and a matching wheel 305 is arranged on the L-shaped rod 304. The limiting component 300 is used to limit the cable 103 when it is wound up. When the L-shaped rod 304 slides along the inclined groove 303, the matching wheel 305 on the L-shaped rod 304 slides synchronously with it. The matching wheel 305 and the squeezing wheel 302 squeeze the cable 103 at the same time, so that the cable 103 is limited to prevent the cable 103 from pulling the reel 102 when the cable 103 is dragged, causing the reel 102 to rotate in the opposite direction, thereby causing damage to the motor in the body 100.

[0046] Furthermore, the extrusion wheel 302 and the matching wheel 305 are adapted to each other, the end of the L-shaped rod 304 is wedge-shaped, and the gap between the extrusion wheel 302 and the matching wheel 305 when they are in contact is smaller than the diameter of the cable 103 .

[0047] Furthermore, the synchronous adjustment component 306 includes a synchronous block 306a rotatably arranged on the sliding ring 208c, the synchronous block 306a is slidably arranged on the guide column 202, and an extrusion cylinder 306b is arranged on the synchronous block 306a. The interior of the extrusion cylinder 306b is wedge-shaped, so that the interior of the extrusion cylinder 306b is a wedge-shaped groove body, and the L-shaped rod 304 and the extrusion cylinder 306b are adapted to each other. The synchronous adjustment component 306 drives the synchronous block 306a to move. When the L-shaped rod 304 squeezes the extrusion cylinder 306b, The L-shaped rod 304 slides along the internal wedge-shaped groove of the extrusion cylinder 306b, and at the same time, the extrusion cylinder 306b is extruded and slides backward, and the synchronization block 306a on the extrusion cylinder 306b slides backward synchronously. At this time, the synchronization block 306a drives the sliding ring 208c to slide synchronously, and the sliding ring 208c slides along the guide groove 208b. At this time, the matching block 208d on the sliding ring 208c is disengaged from the matching block 208d on the fixed disk 208a, thereby causing the pulley 206b to idle on the screw 204.

[0048] Working principle: When the body 100 drives the rotating shaft 101 to rotate, the rotating shaft 101 drives the reel 102 to rotate synchronously, the reel 102 drives the cable 103 to be wound on its surface, the rotating shaft 101 drives the pulley 1 206a to rotate synchronously, the pulley 1 206a drives the pulley 2 206b to rotate synchronously through the transmission belt 206c, in the initial state, the matching block 208d on the sliding ring 208c and the matching block 208d on the fixed disk 208a are adapted to each other, at this time the pulley 206b rotates, the fixed disk 208a and the pulley 2 206b rotate synchronously, and the fixed disk 208c rotates synchronously with each other. The matching block 208d on the 8a squeezes the matching block 208d on the sliding ring 208c, so that the sliding ring 208c rotates synchronously, and the sliding ring 208c squeezes the guide groove 208b, and the guide groove 208b drives the screw rod 204 to rotate synchronously, thereby making the screw rod 204 and the pulley 206b rotate synchronously, and the screw rod 204 drives the guide seat 203 to slide along the thread direction of the screw rod 204, and then cooperates with the guide column 202 for guidance, so that the guide seat 203 slides along the guide column 202, and while the reel 102 is reeled, the cable 102 is guided by the positioning hole 205. When the cable 103 is arranged on the surface of the reel 102, a horizontal force is always maintained to prevent the cable 103 from tilting and deviating. The deviated cable 103 causes indentations or scratches on the reel 102. When the L-shaped rod 304 on the guide seat 203 squeezes the extrusion cylinder 306b, the L-shaped rod 304 slides along the wedge-shaped groove inside the extrusion cylinder 306b. At the same time, the extrusion cylinder 306b is squeezed and slides backward. The synchronization block 306a on the extrusion cylinder 306b slides backward synchronously. At this time, the synchronization block 306a drives the sliding ring 208c to slide synchronously. The sliding ring 208c slides along the guide groove 20 8b slides, and at this time, the matching block 208d on the sliding ring 208c is disengaged from the matching block 208d on the fixed disk 208a, so that the pulley 206b rotates on the screw rod 204, and at the same time, the L-shaped rod 304 slides along the inclined groove 303, and the matching wheel 305 on the L-shaped rod 304 slides synchronously with it. The matching wheel 305 and the squeezing wheel 302 squeeze the cable 103 at the same time, so that the cable 103 is limited to prevent the cable 103 from pulling the reel 102 when the cable 103 is dragged, causing the reel 102 to rotate in the opposite direction, thereby causing damage to the motor in the body 100.

[0049] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0050] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A winch, characterized in that: It comprises a machine body (100), a guide component (200) arranged on the machine body (100), and a position-limiting component (300) arranged on the guide component (200); The machine body (100) comprises a rotating shaft (101), a reel (102) arranged on the rotating shaft (101), and a cable (103) arranged on the reel (102); The guide component (200) comprises a hollow seat (201) arranged on the body (100), a guide column (202) arranged on the hollow seat (201), a guide seat (203) slidably arranged on the guide column (202), a connecting component (206) arranged in the hollow seat (201), a one-way component (207) arranged in the hollow seat (201), a disengaging component (208) arranged in the hollow seat (201), and a resetting component (209) arranged in the hollow seat (201); The limiting component (300) comprises a rotating shaft (301) rotatably arranged on the guide seat (203), an extrusion wheel (302) arranged outside the rotating shaft (301), and a synchronous adjustment component (306) arranged on the guide seat (203).

2. The winch according to claim 1, characterized in that: The guide component (200) further comprises a screw rod (204) rotatably arranged on the hollow seat (201); the guide seat (203) is threadedly connected to the screw rod (204); a positioning hole (205) is arranged on the guide seat (203); and the cable (103) is slidably arranged on the positioning hole (205).

3. The winch according to claim 2, characterized in that: The connecting assembly (206) comprises a pulley 1 (206a) arranged on the outside of the rotating shaft (101), a pulley 2 (206b) is arranged on the outside of the screw rod (204), the pulley 2 (206b) is connected to the screw rod (204) via a bearing, and the pulley 1 (206a) and the pulley 2 (206b) are connected via a transmission belt (206c).

4. The winch according to claim 3, characterized in that: The one-way component (207) comprises a ratchet (207a) arranged on the screw rod (204); a reset shaft (207b) is rotatably arranged on the second pulley (206b); a pawl (207c) is arranged outside the reset shaft (207b); the reset shaft (207b) and the pawl (207c) are connected via a torsion spring; and the ratchet (207a) and the pawl (207c) are meshed with each other.

5. The winch according to claim 4, characterized in that: The disengagement assembly (208) comprises a fixed disk (208a) arranged on the second pulley (206b), a guide groove (208b) is arranged on the outer side of the screw rod (204), a sliding ring (208c) is slidably arranged on the guide groove (208b), and a plurality of matching blocks (208d) are arranged on the corresponding surfaces of the sliding ring (208c) and the fixed disk (208a).

6. The winch according to claim 5, characterized in that: The ends of the plurality of matching blocks (208d) are all wedge-shaped, and the sliding ring (208c) and the fixed disk (208a) are adapted to each other.

7. The winch according to claim 6, characterized in that: The reset assembly (209) comprises a rotating disk (209a) rotatably arranged on a sliding ring (208c), a spring (209b) is arranged outside the screw rod (204), and two ends of the spring (209b) are respectively connected to corresponding surfaces of the rotating disk (209a) and the hollow seat (201).

8. The winch according to claim 7, characterized in that: The limiting component (300) further comprises an inclined groove (303) arranged on the guide seat (203), an L-shaped rod (304) being slidably arranged on the inclined groove (303), and a matching wheel (305) being arranged on the L-shaped rod (304).

9. The winch according to claim 8, characterized in that: The extrusion wheel (302) and the matching wheel (305) are adapted to each other, and the end of the L-shaped rod (304) is wedge-shaped.

10. The winch according to claim 9, characterized in that: The synchronous adjustment component (306) includes a synchronous block (306a) rotatably arranged on a sliding ring (208c), the synchronous block (306a) being slidably arranged on a guide column (202), an extrusion cylinder (306b) being arranged on the synchronous block (306a), the interior of the extrusion cylinder (306b) being wedge-shaped, and the L-shaped rod (304) and the extrusion cylinder (306b) being adapted to each other.

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