A tube shrinking mechanism and a tube shrinking machine

Abstract

This invention belongs to the field of pipe shrinking technology, and particularly relates to a pipe shrinking mechanism and a shrinking machine, comprising: a support component, at least three oscillating components connected to the support component, each oscillating component having an oscillating axis fixed relative to the support component, one end of each oscillating component being a compression portion, the compression portions of each oscillating component forming a compression port, and a driving mechanism for driving each oscillating component to oscillate around the oscillating axis, thereby gradually shrinking the compression port and compressing the opening of the pipe; through the oscillating component's rotational oscillation shrinking method, the compression port formed between the oscillating components can provide torsional force to the shrunken section of the pipe during shrinking by rotating and contracting, causing the transition section between the shrunken and unshrunken sections of the pipe to twist, avoiding the formation of a bulge higher than the uncompressed pipe wall during deformation of the shrunken section, thus facilitating subsequent pipe processing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe processing, in particular to a pipe necking mechanism and a necking machine. BACKGROUND

[0002] Pipe necking is a forming process of reducing the diameter of the end of a pipe blank. The pipe blank enters the deformation zone under the action of axial force, generates tangential contraction necking plastic deformation in the deformation zone, then enters the stable zone, and finally forms a reduced end diameter. The common necking machine in China is driven to beat by air hammer or ball type structure, which not only has large working noise, but also has low processing efficiency and great safety hazards.

[0003] CN106424400B discloses a four-mode oil pressure necking machine, which comprises a rack, a base, a hydraulic system, four oil pressure necking mechanisms and a cooling system capable of cooling the oil pressure necking mechanisms. The base is arranged on the top of the rack, the four oil pressure necking mechanisms are arranged on the base in a circular central symmetry and form an extrusion port, the hydraulic system is connected with the four oil pressure necking mechanisms and can drive the four oil pressure necking mechanisms to perform relative and simultaneous stretching and contraction actions to make the extrusion port in a reduced or increased state. The advantage of this structure is that the four oil pressure necking mechanisms drive the necking to move synchronously in a straight line, which has a mute effect. The disadvantage of this structure is that the pipe necking in a straight pressing manner is easy to form a bulge higher than the wall of the uncompressed pipe at the transition section between the pipe and the necking end, which is not conducive to the subsequent processing of the pipe. SUMMARY

[0004] The purpose of the present application is to provide a pipe necking mechanism and a necking machine with high pipe forming quality, aiming to solve the technical problems in the prior art.

[0005] To achieve the above-mentioned purpose, the pipe necking mechanism provided by the embodiments of the present application is suitable for a necking machine, the necking machine is provided with a pipe necking station, and comprises: a support component, at least three deflection components connected with the support component, a deflection axis is arranged on each deflection component, the deflection axis is fixed relative to the support component, one end of each deflection component is an extrusion part, the extrusion parts of the deflection components enclose an extrusion port, a driving mechanism for driving each deflection component to swing around the deflection axis to gradually reduce the extrusion port and extrude the port of the pipe, and a reset component connected with the deflection components for pushing the deflection components to swing reversely.

[0006] Further, the end of each deflection component is further provided with a deformation lead part, the deformation lead part is a conical arc surface, and the small end of the deformation lead part extends to the extrusion part. When the extrusion part swings to the closest position of the center of the extrusion port, the deformation lead parts on each deflection component enclose a tapered hole.

[0007] Further, an end of each of the extruding parts is provided with a deformation filling position, the pipe material mouth part is extruded by the pipe shrinking mechanism, and the extruded and deformed material of the pipe material fills the deformation filling position, so that a plurality of protrusions are formed on the pipe material.

[0008] Further, an end of each of the extruding parts is provided with a deformation filling position, the pipe material mouth part is extruded by the pipe shrinking mechanism, and the extruded and deformed material of the pipe material fills the deformation filling position, so that a plurality of protrusions are formed on the pipe material.

[0009] Further, the swing axis position of the swing part is provided with a mounting shaft, and the mounting shaft is connected with the supporting part.

[0010] Further, the drive includes a driving source and a contact part, the contact part is provided with a forming cavity, the pipe shrinking station is formed in the forming cavity, a guide side wall extending obliquely to the pipe shrinking station is arranged between the forming cavity and the swing part, the driving source drives the contact part to move relatively and close to the swing part, one end of the swing part away from the extruding part is provided with a force receiving part, the free end of the swing part can be guided by the guide side wall to rotate and swing and contact the pipe material fixed on the pipe shrinking station in the process of relative movement.

[0011] Further, the guide side wall is formed at one end of the swing part away from the extruding part.

[0012] Further, the extruding part is detachably arranged to facilitate replacement of the extruding part.

[0013] Further, the reset part includes an abutting piece and an elastic piece, the abutting piece is arranged at one end of the swing part away from the mounting shaft, one end of the elastic piece abuts against the mounting shaft, and the other end of the elastic piece abuts against the abutting piece, and the elastic piece always drives the abutting piece to move away from the pipe material on the pipe shrinking station.

[0014] The pipe shrinking mechanism provided by the embodiment of the present application has at least one of the following technical effects: the necking die is movably arranged on the mold plate through the rotating shaft, the necking die can be rotated and shrunk to change the size of the extruding opening by driving the contact part to contact the necking die by the driving source, the necking die does not need to be driven to move linearly synchronously by multiple oil cylinders, the influence of the movement error of the necking die on the pipe forming is avoided, the cost is saved, and the market competitiveness of the product is improved.

[0015] To achieve the above-mentioned purpose, the embodiment of the present application provides a pipe shrinking machine, which includes the above-mentioned pipe shrinking mechanism.

[0016] The technical scheme provided by the tube shrinking machine has at least one of the following technical effects: the rotating and shrinking mode of the deflection component forms the extrusion opening between the deflection components, and the extrusion opening can provide a torsion to the tube shrinking section of the pipe in a rotating and shrinking mode when the pipe is shrunk, so that the transition section between the tube shrinking section and the non-tube shrinking section is twisted, and the transition section is prevented from forming a bulge higher than the non-tube shrinking section when the tube shrinking section is deformed, thereby facilitating subsequent processing of the pipe. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application.

[0019] Figure 2 It is a schematic diagram of the partial cross-sectional structure of the present application.

[0020] Figure 3 It is a schematic diagram of the planar structure of the present application.

[0021] Figure 4 It is a schematic diagram of the partial mechanism of the present application.

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the necking die of the present application.

[0023] Figure 6 It is a schematic diagram of the extrusion opening 21 in the tube shrinking state of the present application.

[0024] Figure 7 It is a schematic diagram of the pipe after forming of the present application.

[0025] Figure 8 It is a planar schematic diagram of the pipe after forming of the present application.

[0026] In the drawings, the reference signs are as follows: 1, die plate; 11, mounting shaft; 2, deflection component; 21, extrusion opening; 23, extrusion part; 221, deformation filling position; 222, deformation lead part; 23, reset torsion spring; 3, contact component; 31, guide side wall; 4, oil cylinder; 5, hydraulic system; 6, cooling system; 7, base; 71, guide column; 8, workbench; a, tube shrinking section a; b, transition section b. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout the drawings. The following detailed description of the embodiments of the present application is provided for the purpose of explanation only. It should be readily apparent to those skilled in the art that many changes in the embodiments of the present application can be made without departing from the underlying principles described herein. Figure 1 The described embodiments are merely exemplary and are intended to illustrate, but not to limit, the embodiments of the present application.

[0028] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely used for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0029] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0030] In the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0031] As Figures 1-8The pipe shrinking mechanism of the present application is applicable to a pipe shrinking machine, which is provided with a pipe shrinking station, and comprises a supporting part, a deflection part 2, a driving mechanism and a reset part. The deflection part 2 is at least three pieces, preferably six pieces, connected to the supporting part. The deflection part 2 is provided with a swing axis, which is fixed relative to the supporting part. One end of the deflection part 2 is an extrusion part 23. The extrusion parts 23 of the deflection parts 2 enclose an extrusion opening 21, into which the pipe can be inserted. The size of the extrusion opening 21 changes with the swing of the deflection part 2 around the swing axis. The driving mechanism is used to drive the deflection part 2 to swing around the swing axis, so that the extrusion opening 21 gradually shrinks to extrude the opening part of the pipe. The reset part is connected to the deflection part 2, and is used to push the deflection part 2 to swing in the opposite direction. In use, one end of the pipe is inserted into the extrusion opening 21, and the driving mechanism drives the deflection part 2 to swing, so that the extrusion opening 21 formed between the deflection parts 2 rotates to shrink and extrude the pipe. Compared with the existing straight extrusion pipe shrinking, the rotating shrinkage pipe extrusion opening 21 can provide a torsional force to the pipe shrinking section a during the pipe shrinking process, so that the transition section b between the pipe shrinking section a and the non-pipe shrinking section a is twisted, avoiding the formation of a bulge higher than the non-compressed pipe wall when the pipe shrinking section a deforms, and facilitating the subsequent processing of the pipe.

[0032] When the pipe is extruded by the above mechanism, in order to adapt to the gradually shrinking extrusion opening 21, the pipe wall of the pipe shrinking section a will be irregularly bent and folded during the pipe shrinking, resulting in uneven structural strength of the pipe shrinking section a after the pipe shrinking, which is easy to cause large deformation of the pipe shrinking section a during the subsequent extrusion processing.

[0033] Based on the above problems, such as Figure 5As shown, the end of the extrusion part 23 of the deflection component 2 of the present application is formed with a deformation filling position 221 which is an arc-shaped notch, the deformation filling position 221 axially penetrates the deflection component 2, when the pipe material mouth portion is extruded by the pipe shrinking mechanism, the material of the pipe material extrusion deformation fills the deformation filling position 221, so that a plurality of protrusions corresponding to the deformation filling position 221 are formed on the pipe material. With the continuous rotation and extrusion of the pipe material by the deflection component 2, the protrusions formed in the deformation filling position 221 rotate in the same direction with the deflection component 2 under the driving of the deformation filling position 221, so that the protrusions rotate and approach each other, thereby forming a support structure between the protrusions which supports each other, and the structural strength of the pipe shrinking section a is strengthened, and the pipe shrinking end can withstand multiple extrusions without large deformation. Since the deformation filling position 221 axially penetrates the deflection component 2, the support structure formed by the deformation filling position 221 will extend to the transition section b, and the structural strength of the transition section b is strengthened, and when the pipe material is subsequently drawn, the transition section b can be prevented from being broken due to insufficient structural strength when it contacts the drawing die. In addition, the deformation filling position 221 is an arc-shaped notch, and the protrusions formed in the deformation filling position 221 have a water droplet-shaped protruding part which adapts to the arc-shaped notch. In the case of uniform pipe wall thickness, a gas hole will be formed in the protrusion with the protruding part, and when the pipe material is subsequently drawn, the gas in the pipe material can be discharged outwardly from the gas hole, thereby avoiding the rupture of the pipe material during drawing.

[0034] The existing four-mode oil compression head machine forms the pipe shrinking section a by four oil compression head mechanisms in a straight pressing manner, and the pipe shrinking section a is a prism with four side edges. In general, during subsequent extrusion, when the edge surface of the prism-shaped pipe shrinking section a is not perpendicular to the clamping die, the pipe shrinking section a will automatically rotate under the extrusion of the clamping die, so that the edge surface is perpendicular to the clamping die. However, since the side edges are relatively sharp, if the clamping die directly contacts the side edges during extrusion, the relatively sharp side edges will generate a large friction force with the clamping die, which hinders the rotation of the pipe shrinking section, and the edge surface of the pipe shrinking section a cannot be perpendicular to the clamping die during subsequent extrusion, which causes the clamping die to extrude the side edges of the pipe shrinking section a and makes the pipe shrinking section a generate a large deformation, and the sharp part of the side edge will also damage the clamping die, causing economic losses. Therefore, the pipe shrinking section a needs to be rotated and adjusted before subsequent extrusion, so that the side surface of the pipe shrinking section a is perpendicular to the clamping die, which is time-consuming and laborious and reduces the efficiency. The pipe shrinking section a with the support structure as described above is shown in Figure 8As shown, the six deflection components are taken as an example, the pipe reducing section a is composed of six rotating protrusions formed on the pipe wall, the clamping mold clamps the two sides of the pipe reducing section a, the two sides of the pipe reducing section a are respectively provided with two protrusions corresponding to the clamping mold, the clamping mold clamps the part between the two ends of the protrusions and forms a line contact with the protrusions, the end of the protrusion is relatively smooth, and when the protrusion is in contact with the clamping mold, a large friction force is not generated between the clamping mold and the protrusion, when the part between the two ends of the protrusions located on the two sides of the pipe reducing section a is not directly opposite to the clamping mold and one of the protrusions is in contact with the clamping mold, the pipe reducing section a can be self-adaptively rotated under the extrusion of the clamping mold, so that the part between the two ends of the protrusions is directly opposite to the clamping mold, and the pipe reducing section a does not have the above-mentioned straight pressing forming side edge part, so that the clamping mold is not damaged, and the economic loss is reduced.

[0035] As shown, Figure 5 The deflection component 2 of the present application is further provided with a deformation lead-in part 222, the deformation lead-in part 222 is formed on one side of the end of the deflection component 2 in contact with the pipe, the deformation lead-in part 222 is a tapered arc surface expanding to the pipe reducing station, and the small end of the deformation lead-in part 222 extends to the extrusion part 23; when the extrusion part 23 swings to the closest position of the center of the extrusion opening 21, the deformation lead-in parts 222 on each deflection component 2 enclose a tapered hole, the deformation lead-in part 222 provides a guiding effect for the pipe in deformation, so that a tapered transition section b is formed between the pipe reducing section a and the non-pipe reducing section a of the pipe, the transition section b is tapered, and the pulling force applied to the pipe in subsequent drawing process can be smaller, so that the transverse cutting force generated by the contact between the drawing mold and the transition section b of the pipe is reduced, and the pipe is further prevented from being broken during drawing.

[0036] The small end of the deformation lead-in part 222 can also be in contact with the cross section of the deformation filling position 221, which can make the pipe protrusion forming more smooth.

[0037] The driving mechanism includes a driving source and a contact component 3, the contact component 3 is a rectangular cuboid structure with a forming cavity, the pipe reducing station is formed in the forming cavity, a guide side wall 31 inclinedly extending to the pipe reducing station is arranged between the forming cavity and the deflection component 2, the driving source is preferably an oil cylinder 4, the output end of the oil cylinder 4 drives the movement of a support component or the contact component 3 supporting the deflection component 2, the driving source is used to drive the relative movement of the contact component 3 and the deflection component 2 to approach each other, one end of the deflection component 2 away from the extrusion part 23 is provided with a stress receiving part, with the contact of the guide side wall 31 and the stress receiving part, the free end of the deflection component 2 can be guided by the guide side wall 31, and the deflection component 2 rotates and contacts the pipe fixed on the pipe reducing station during the relative movement.

[0038] Since the deflection component 2 is guided to rotate by the guide side wall 31, multiple driving sources are not required to drive the deflection component 2 to rotate, errors generated in the multiple driving sources are avoided to affect the pipe forming, and the oil cylinder 4 for driving the support component and the contact component 3 to move can be only one, cost is saved, and product market competitiveness is improved.

[0039] In the first embodiment of the contact component 3 relative to the deflection component 2, the contact component 3 is dynamically arranged, the contact component 3 is driven by the driving source to move to the deflection component 2, when the contact component 3 moves to contact the deflection component 2, the deflection component 2 rotates under the extrusion of the guide side wall 31, and the pipe is extrusion formed; in another embodiment of the contact component 3 relative to the deflection component 2, the contact component 3 is fixedly arranged, the driving source drives the deflection component 2 to move to the contact component 3, when the contact component 3 moves to contact the deflection component 2, the deflection component 2 rotates in the process of relative movement under the extrusion of the guide side wall 31, and the pipe is extrusion formed, the deflection component 2 is fixed, compared with the movable deflection component 2, no movement is generated in the process of rotational forming, and the length of the pipe extrusion forming section can be accurately controlled.

[0040] The guide side wall 31 is arranged in an inclined curved surface structure, the free end of the deflection component 2 rotates and swings under the guidance of the inclined curved surface of the guide side wall 31 after contacting the guide side wall 31, and those skilled in the art should understand that the angle range of the rotation and swing of the free end of the deflection component 2 is related to the inclination of the guide side wall 31, and the specific inclination is determined according to the pipe shrinking requirement of the shrinking machine; of course, the guide side wall 31 is not limited to a curved surface, and the guide side wall 31 can also be arranged in an inclined plane under the condition that the rotation of the deflection component 2 is not interfered.

[0041] As the first embodiment of the guide side wall 31 of the present application, the guide side wall 31 can be a flared conical cam surface in the forming cavity and facing the deflection component 2 as shown in the figure, when the deflection component 2 contacts the conical cam surface, the movable range of the deflection component 2 gradually decreases under the limitation of the conical cam surface as the deflection component 2 and the conical cam surface continue to approach, in order to adapt to the gradually decreasing movable range, the free end of the deflection component 2 adaptively rotates and swings, so that the extrusion opening 21 formed between the deflection component 2 gradually decreases to extrude the pipe as shown in the figure.

[0042] As Figure 5As shown, the swing axis position of the swing component 2 is provided with a mounting shaft 11, the mounting shaft 11 is fixedly connected with a support component, the support component can be the template 1 shown in the figure, the mounting shaft 11 is fixedly arranged on the template 1, of course, the support component is not limited to the template 1, and can also be a support frame or a rack and other components that can be used to support the pipe reducing activity; the axial section of the swing component 2 is a conical surface, the swing component 2 has side surfaces abutting each other, and a included angle is formed between the side surfaces; when the number of the swing component 2 is six, the angle of the included angle is 60 degrees; in order to realize the enlargement and reduction of the extrusion port 21 due to the rotation of the swing component 2, the mounting shaft 11 is connected with the swing component 2 in rotation away from the center line of the section symmetry of the swing component 2.

[0043] The extrusion part 23 of the swing component 2 described above can also be detachable, for example, Figure 5 As shown, a sliding groove is arranged on the swing component 2, and the extrusion part 23 has a mounting guide rail corresponding to the sliding groove; when the pressing part needs to be replaced and maintained, the mounting guide rail of the extrusion part 23 can be separated from the sliding groove by pushing the extrusion part 23, and the extrusion part 23 can be detached from the swing component 2, and such a connection mode facilitates the replacement of the extrusion part 23.

[0044] As another embodiment of the guide side wall 31 of the present application, the guide side wall 31 can also be formed on the end of the swing component 2 away from the extrusion part 23, for example, Figure 2 As shown, the guide side wall 31 has a side wall extending obliquely to the pipe reducing station, and the side wall is in contact with the forming cavity of the contact component 3; in this embodiment, the forming cavity can be a cylindrical cavity, and the edge of the forming cavity is in contact with the side wall; under the restriction of the forming cavity and the guidance of the swing component 2, the free end of the swing component 2 rotates and swings adaptively, and the pipe is extruded; in this embodiment, in order to reduce the wear between the forming cavity and the swing component 2, the forming cavity can also be a flared conical arc surface as described above, and the guide side wall 31 on the swing component 2 is in contact with the conical arc surface of the forming cavity; under the restriction of the forming cavity and the guidance of the guide side wall 31, the free end of the swing component 2 rotates and swings adaptively, and the pipe is extruded.

[0045] As shown in the figure, Figures 4-5As shown, the deflection component 2 of the present application is provided with a reset component for resetting the deflection component 2, the reset component comprising an abutting piece and an elastic piece, the abutting piece being arranged at the end of the deflection component 2 away from the driving source, one end of the elastic piece abutting the output end of the driving source, and the other end of the elastic piece abutting the abutting piece, the elastic piece always driving the abutting piece away from the pipe material on the pipe shrinking station. The elastic piece can be a reset torsion spring 23 connected between the mounting shaft 11 and the abutting piece, so that when the deflection component 2 is separated from the contact unit, the deflection component 2 is rotated to expand, and the elastic piece can also be a tension spring (not shown in the figure) connected between the supporting component and the abutting piece, when the deflection component 2 is rotated to shrink, the tension spring is stretched, and when the deflection component 2 is separated from the contact unit, the deflection component 2 is rotated to expand under the action of the tension of the tension spring.

[0046] The present application also includes a workbench 8 and a guide column 71, the base 7 is vertically arranged on the workbench 8, the guide column 71 is arranged on the base 7 at an angle parallel to the table surface of the workbench 8, and the template 1 and the contact component 3 are arranged on the guide column 71. When the pipe material is shrunk, the pipe material can be inserted into the extrusion opening 21 in a horizontal direction, which is more convenient for people to operate than vertically inserting the pipe material into the extrusion opening 21.

[0047] The present application also has a hydraulic system 5 and a cooling system 6, the hydraulic system 5 is connected with the oil cylinder 4 for driving the oil cylinder 4 to perform extension and contraction movement, when the hydraulic system 5 works, the oil temperature will rise, resulting in the performance of the oil cylinder 4 being reduced, and the cooling system 6 is used for cooling the hydraulic oil to ensure the improvement of the performance of the whole machine. The hydraulic system 5 and the cooling system 6 are prior art, and their components and technical details will not be described in detail in the present application.

[0048] In the case of having a plurality of deflection components 2, the present application avoids the error existing between the plurality of driving sources by the way of contacting the deflection component 2 with the guide side wall 31 to rotate the deflection component 2, compared with the plurality of driving sources driving the deflection component 2 to rotate respectively, the forming quality of the pipe material is improved, and at the same time, through the pipe shrinking mode of rotating shrinkage, the bulge higher than the un-compressed pipe wall formed when the transition section b is deformed in the pipe shrinking section a is avoided, which is convenient for subsequent processing of the pipe material.

[0049] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tube shrinking mechanism for shrinking tube heads, the tube shrinking mechanism being provided with a tube shrinking station, characterized in that, include: Support components; At least three oscillating components are connected to the support component. Each oscillating component is provided with an oscillation axis, which is fixed relative to the support component. One end of each oscillating component is a pressing part, and the pressing parts of each oscillating component form a pressing port. A drive mechanism is used to drive each of the oscillating components to oscillate around the oscillation axis, thereby gradually reducing the size of the extrusion orifice and extruding the opening of the tube; and A reset component, connected to the yaw component, is used to push the yaw component to swing in the opposite direction; Each of the aforementioned oscillating components is further provided with a deformation guide portion at its end. The deformation guide portion is a conical arc surface, and the small end of the deformation guide portion extends to the extrusion portion. When the extrusion portion swings to the closest position to the center of the extrusion port, the deformation guide portions on each of the aforementioned oscillating components form a conical hole. The driving mechanism includes a driving source and a contact component. The contact component has a forming cavity, and the tube shrinking station is formed in the forming cavity. A guide sidewall extending inclined towards the tube shrinking station is provided between the forming cavity and the swing component. The driving source drives the contact component to move relative to the swing component and approach it. The end of the swing component away from the extrusion part is provided with a force-bearing part. As the guide sidewall contacts the force-bearing part, the free end of the swing component can be guided by the guide sidewall and rotate and swing during relative movement to contact the tube fixed on the tube shrinking station.

2. The tube-shrinking mechanism according to claim 1, characterized in that, Each of the extrusion sections has a deformation filling position at its end. The tube shrinking mechanism extrudes the tube opening, and the material deformed by the tube extrusion fills the deformation filling position, so that several protrusions are formed on the tube.

3. The tube-shrinking mechanism according to any one of claims 1 to 2, characterized in that, The oscillation axis of the oscillation component is provided with a mounting shaft, which is connected to the support component.

4. The tube-shrinking mechanism according to claim 1, characterized in that, The guide sidewall is formed at the end of the oscillating component away from the extrusion section.

5. The tube-shrinking mechanism according to claim 4, characterized in that, The extrusion section is detachable to facilitate its replacement.

6. The tube-shrinking mechanism according to claim 3, characterized in that, The reset component includes an abutment and an elastic element. The abutment is disposed at the end of the swaying component away from the mounting shaft. One end of the elastic element abuts against the mounting shaft, and the other end of the elastic element abuts against the abutment. The elastic element always drives the abutment away from the pipe on the tube shrinking station.

7. A head-shrinking machine, characterized in that, Includes the tube shrinking mechanism as described in any one of claims 1 to 6.

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