Exhaust pipe necking forming equipment

Abstract

The utility model discloses an exhaust pipe necking forming device which comprises a base, a two-shaft horizontal translation unit, a clamping unit, a plurality of necking dies and an oil coating unit, wherein the oil coating unit and the clamping unit are arranged side by side, and the oil coating unit is used for brushing oil on the inner walls of the corresponding necking dies. The oiling unit comprises a mounting frame, a center shaft, a driving mechanism, a brushing mechanism and an oil supplementing mechanism, wherein the center shaft is horizontally assembled on the mounting frame in a sliding mode in the axis direction of the center shaft and can be coaxially inserted into the corresponding necking die in a sliding mode, the brushing mechanism is assembled on the center shaft, and the oil supplementing mechanism is assembled on the mounting frame and used for conveying oil to the brushing mechanism which restores to the original position. The driving mechanism drives the center shaft to rotate, the brushing mechanism can rotate by a circle around the axis of the center shaft to smear oil on the inner wall of the necking die, the center shaft slides on the mounting frame away from the necking die to drive the brushing mechanism to return to the original position, the oil supplementing mechanism can supplement oil to the brushing mechanism, manual oil smearing work is not needed, and the operation safety coefficient is increased; and the oil smearing quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field related to exhaust pipe processing, and in particular to exhaust pipe shrinkage molding equipment. Background Art

[0002] The exhaust pipe is part of the engine exhaust system. The exhaust system mainly includes the exhaust pipe, exhaust pipe and muffler. Generally, the three-stage catalytic converter to control the engine pollutant emission is also installed in the exhaust system. The exhaust pipe generally includes the front exhaust pipe and the rear exhaust pipe. However, when the exhaust pipe is produced, both the front and rear ends need to be narrowed.

[0003] There are many processing methods for the exhaust pipe shrinking process. In one of the shrinking processing modes, several shrinking molds with decreasing inner diameters are successively mounted on the end of the steel pipe to perform multi-stage shrinking on the end of the steel pipe. The two-axis horizontal moving unit drives several shrinking molds to be successively mounted on the end of the steel pipe. The two-axis horizontal moving unit can be composed of two screw slides, and then drives the shrinking mold to move close to the steel pipe to be mounted on the steel pipe, and then drives the shrinking mold to move away from the steel pipe to separate from the steel pipe, and then the adjacent shrinking molds are mounted on the end of the steel pipe in the same operation mode.

[0004] Before each shrinking mold is put on the end of the steel pipe, the operator is required to use a brush to brush oil on the surface of the steel pipe. The oil can not only reduce the friction coefficient between the shrinking mold and the steel pipe, but also prevent the two from getting stuck. The operator uses the alternating time between two adjacent shrinking molds to brush oil on the outer wall of the steel pipe. Not only is the oiling uneven, but the operation is also unsafe. Therefore, it is necessary to design an exhaust pipe shrinking molding equipment. Utility Model Content

[0005] In view of the above technical problems, the purpose of the utility model is to overcome the problem in the prior art that manual oiling is not only unevenly distributed but also has potential safety hazards.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an exhaust pipe shrinkage forming device, comprising: a base, a two-axis horizontal translation unit mounted on the base, a clamping unit mounted on the base for clamping a steel pipe, a plurality of shrinkage molds mounted on the output end of the two-axis horizontal translation unit at equal intervals in the horizontal direction, and an oiling unit mounted on the base and arranged side by side with the clamping unit for brushing oil on the inner wall of the corresponding shrinkage mold;

[0007] The oiling unit includes a mounting frame, a central shaft mounted on the mounting frame for horizontal sliding along its own axial direction and capable of being coaxially slidably inserted into the corresponding shrinking mold, a driving mechanism for driving the central shaft to rotate around its own axis, a brushing mechanism mounted on the central shaft and capable of contacting the inner wall of the shrinking mold, and an oil replenishing mechanism mounted on the mounting frame for transporting oil to the brushing mechanism to restore it to its original position.

[0008] Preferably, the brushing mechanism comprises a first hinge shaft whose axial direction is perpendicular to the axial direction of the central shaft and is installed on the inner end of the central shaft that can be inserted into the shrinking mold, a guide arm whose one end is hinged to the first hinge shaft and the other end is tilted away from the shrinking mold, a first strip brush hinged to the end of the guide arm away from the first hinge shaft through a second hinge shaft parallel to the first hinge shaft and parallel to the central shaft, and a second strip brush installed at the end of the first strip brush away from the guide arm through a third hinge shaft parallel to the second hinge shaft, the end of the second strip brush away from the first strip brush is tilted away from the guide arm and is arranged away from the central shaft;

[0009] An adjustment mechanism for adjusting the angle between the second strip brush and the first strip brush is installed on the side of the first strip brush close to the central axis and is connected to the side of the second strip brush close to the central axis. An elastic reset mechanism connected to the first strip brush is installed on the central axis and is used to push the first strip brush to translate away from the central axis.

[0010] Preferably, the elastic reset mechanism includes a sliding sleeve slidably mounted on the central axis in a coaxial direction, at least two inclined first connecting rods arranged in parallel and spaced apart along the length direction of the central axis, and an elastic member for pushing the sliding sleeve to slide close to the first hinge axis, the two ends of each first connecting rod are respectively hinged to the sliding sleeve and the first strip brush, the end of the first connecting rod hinged to the sliding sleeve is inclined away from the first hinge axis, and the central axis is equipped with a limiting ring located on the side of the sliding sleeve close to the first hinge axis.

[0011] Preferably, the central shaft is recessed with a plurality of positioning grooves spaced at intervals along the length direction, and the limiting ring is threadedly mounted with positioning bolts whose ends can be inserted into corresponding positioning grooves.

[0012] Preferably, a mounting ring is fixedly mounted on the central shaft and is located on a side of the sliding sleeve away from the limiting ring. The elastic member is a spring sleeved on the central shaft, and two ends of the spring are respectively in contact with the mounting ring and the sliding sleeve.

[0013] Preferably, the adjustment mechanism includes a mounting arm fixedly mounted on the first strip brush in the same length direction, a second connecting rod hinged to the middle part of the second strip brush, an adjusting member hinged to the end of the second connecting rod away from the second strip brush and slidably connected to the mounting arm, and a mounting bolt installed on the adjusting member for fixing the adjusting member on the mounting arm.

[0014] Preferably, a strip slide parallel to the central axis is fixedly mounted on the mounting frame, a sliding member is slidably arranged on the strip slide, an end of the central axis away from the shrinking mold is mounted on the sliding member through at least one shaft seat, and a cylinder whose output end is fixedly connected to the sliding member is fixedly mounted on the mounting frame;

[0015] The driving mechanism comprises a stepper motor fixedly mounted on a sliding member, a first gear is fixedly sleeved on an output shaft of the stepper motor, and a second gear meshing with the first gear is fixedly sleeved on the central shaft.

[0016] Preferably, the oil replenishing mechanism comprises an oil replenishing pipe fixedly mounted on the mounting frame through a supporting frame and located directly on the strip slide, the oil replenishing pipe is arranged parallel to the central axis, and a plurality of oil outlet holes arranged at intervals along the length direction are arranged at the lowest point of the oil replenishing pipe.

[0017] According to the above technical scheme, the utility model provides an exhaust pipe shrinkage forming device, which has the following beneficial effects when in use: first, the driving mechanism drives the central shaft to rotate, and the brushing mechanism rotates around the axis of the central shaft for one circle to apply oil to the inner wall of the shrinkage mold. After the shrinkage mold is separated from the brushing mechanism, the central shaft slides away from the shrinkage mold on the mounting frame to drive the brushing mechanism to return to its original position. At this time, the oil replenishing mechanism can replenish the oil to the brushing mechanism, and there is no need for manual oiling work, which simplifies the work procedure, reduces the difficulty of operation, improves the safety factor of operation, and can also improve the quality of oil application;

[0018] Secondly, because the oiling unit and the clamping unit are arranged side by side, when one of the shrinking molds is sleeved on the steel pipe, the oiling unit can also apply oil to the inner wall of the other shrinking mold, thereby improving work efficiency.

[0019] Other features and advantages of the utility model will be described in detail in the subsequent specific implementation mode; and the parts not involved in the utility model are the same as the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0021] Figure 1 It is a three-dimensional structural schematic diagram of an exhaust pipe shrinkage forming device provided by the present invention;

[0022] Figure 2 It is a partial three-dimensional structural schematic diagram of an exhaust pipe shrinkage forming device provided by the present invention;

[0023] Figure 3 It is a cross-sectional view of a shrinking die and an oil coating unit of an exhaust pipe shrinking forming device provided by the utility model;

[0024] Figure 4 It is a partial three-dimensional structural schematic diagram of an oil coating unit of an exhaust pipe shrinkage forming device provided by the present invention;

[0025] Figure 5 The utility model provides an exhaust pipe shrinkage forming device Figure 4 The enlarged schematic diagram of point A in the middle;

[0026] Figure 6 The utility model provides an exhaust pipe shrinkage forming device Figure 4 A magnified schematic diagram of point B in the middle.

[0027] Description of Reference Numerals

[0028] 1. Base; 2. Two-axis horizontal translation unit; 3. Clamping unit; 4. Shrinking mold; 5. Mounting frame; 6. Center axis; 7. Guide arm; 8. First strip brush; 9. Second strip brush; 10. Sliding sleeve; 11. First connecting rod; 12. Elastic member; 13. Limiting ring; 14. Positioning groove; 15. Positioning bolt; 16. Mounting ring; 17. Mounting arm; 18. Second connecting rod; 19. Adjusting member; 20. Mounting bolt; 21. Strip slide; 22. Sliding member; 23. Cylinder; 24. Stepper motor; 25. Support frame; 26. Oil supply pipe. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0030] In the present utility model, unless otherwise stated, directional words such as "upper, lower, inside, outside" contained in a term merely represent the orientation of the term in normal use, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term.

[0031] like Figure 1-6 As shown, an exhaust pipe shrinkage forming device comprises: a base 1, a two-axis horizontal translation unit 2 mounted on the base 1, a clamping unit 3 mounted on the base 1 for clamping a steel pipe, a plurality of shrinkage molds 4 mounted at equal intervals in the horizontal direction on the output end of the two-axis horizontal translation unit 2, and an oiling unit mounted on the base 1 and arranged side by side with the clamping unit 3 for brushing oil on the inner wall of the corresponding shrinkage mold 4;

[0032] The oil coating unit includes a mounting frame 5, a central shaft 6 which is horizontally slidably mounted on the mounting frame 5 along its own axial direction and can be coaxially slidably inserted into the corresponding shrinking mold 4, a driving mechanism for driving the central shaft 6 to rotate around its own axis, a brushing mechanism which is mounted on the central shaft 6 and can contact the inner wall of the shrinking mold 4, and an oil replenishing mechanism which is mounted on the mounting frame 5 and is used to transport oil to the brushing mechanism to restore it to its original position.

[0033] The two-axis horizontal translation unit 2 and the clamping unit 3 are both existing mature technologies, and the specific structure and working principle are not described in this article.

[0034] After the clamping unit 3 fixes and clamps the steel pipe, the two-axis horizontal translation unit 2 will drive a plurality of shrinking dies 4 to be sequentially sleeved on the end of the steel pipe, and the inner diameter of a row of shrinking dies 4 decreases sequentially, so that the end of the steel pipe gradually shrinks.

[0035] Before the two-axis horizontal translation unit 2 drives the corresponding shrinking mold 4 to be installed on the steel pipe, it first drives the shrinking mold 4 to be installed on the oiling unit. The oiling unit is used to apply oil to the inner wall of the shrinking mold 4. When the shrinking mold 4 moves close to the mounting frame 5, the central axis 6 will also move close to the shrinking mold 4. After the central axis 6 and the brushing mechanism are inserted into the shrinking mold 4, the brushing mechanism will fit the inner wall of the shrinking mold 4, and the driving mechanism will drive the central axis 6 to rotate. The brushing mechanism will rotate around the axis of the central axis 6 for one circle to apply oil to the inner wall of the shrinking mold 4. After the shrinking mold 4 is separated from the brushing mechanism, the central axis 6 slides away from the shrinking mold 4 on the mounting frame 5 to drive the brushing mechanism to return to its original position. At this time, the oil replenishing mechanism can replenish the oil to the brushing mechanism, and there is no need for manual oiling work, which simplifies the working procedures, reduces the difficulty of operation, improves the safety factor of operation, and can also improve the quality of oil application.

[0036] The purpose of applying oil to the inner wall of the necking mold 4 is the same as that of applying oil to the outer wall of the steel pipe, both of which are to reduce the sliding friction between the two and also to avoid jamming between the two.

[0037] Because the oiling unit and the clamping unit 3 are arranged side by side, when one of the shrinking molds 4 is sleeved on the steel pipe, the oiling unit can also apply oil to the inner wall of the other shrinking mold 4, thereby improving work efficiency.

[0038] The brushing mechanism comprises a first hinge shaft whose axial direction is perpendicular to the axial direction of the central shaft 6 and is installed on the inner end of the central shaft 6 which can be inserted into the shrinking mold 4, a guide arm 7 whose one end is hinged to the first hinge shaft and whose other end is tilted away from the shrinking mold 4, a first strip brush 8 which is hinged to the end of the guide arm 7 away from the first hinge shaft through a second hinge shaft parallel to the first hinge shaft and is parallel to the central shaft 6, and a second strip brush 9 which is installed on the end of the first strip brush 8 away from the guide arm 7 through a third hinge shaft parallel to the second hinge shaft, and the end of the second strip brush 9 away from the first strip brush 8 is tilted away from the guide arm 7 and is arranged away from the central shaft 6;

[0039] An adjustment mechanism for adjusting the angle between the second strip brush 9 and the first strip brush 8 is installed on the side of the first strip brush 8 close to the central axis 6 and connected to the side of the second strip brush 9 close to the central axis 6. An elastic reset mechanism connected to the first strip brush 8 and used to push the first strip brush 8 to translate away from the central axis 6 is installed on the central axis 6.

[0040] Because there is a flared portion at the end of the necking die 4, the first thing the end of the steel pipe contacts is the flared portion of the necking die 4, so the coating mechanism also needs to apply oil to the flared portion.

[0041] The angles of the flaring parts of the same set of shrinking molds 4 are the same, so the inclination angle between the first strip brush 8 and the second strip brush 9 can be adjusted by an adjustment mechanism, so that when the first strip brush 8 fits the inner wall of the shrinking mold 4, the second strip brush 9 can fit the flaring part, so that the brushing mechanism can apply oil to the inner walls of different sets of shrinking molds 4.

[0042] When the center shaft 6 is inserted into the necking mold 4, the guide arm 7 first contacts with the necking mold 4. The center shaft 6 continues to be inserted into the necking mold 4, which will squeeze the guide arm 7 to rotate close to the center shaft 6. The guide arm 7 will drive the first strip brush 8 to move parallel to the center shaft 6. When the guide arm 7 is separated from the flaring part and inserted into the necking mold 4, it will drive the first strip brush 8 to contact with the inner wall of the necking mold 4. At this time, the center shaft 6 continues to be inserted into the inner wall of the necking mold 4 until the second strip brush 9 contacts with the flaring part.

[0043] Because the inner diameters of several shrinking molds 4 in the same set of shrinking molds 4 decrease successively, in order to enable the first strip brush 8 to oil the inner wall of each shrinking mold 4, an elastic reset mechanism is provided. The elastic reset mechanism is used to push the first strip brush 8 to move parallel to the center axis 6, and the function of the guide arm 7 is to enable the shrinking mold 4 to be smoothly mounted on the first strip brush 8, so that the brushing mechanism can oil the shrinking molds 4 with different inner diameters, and is highly practical.

[0044] The elastic reset mechanism includes a sleeve 10 slidably mounted on the central shaft 6 in a coaxial direction, at least two inclined first connecting rods 11 arranged in parallel and spaced apart along the length direction of the central shaft 6, and an elastic member 12 for pushing the sleeve 10 to slide close to the first hinge axis. The two ends of each first connecting rod 11 are respectively hinged to the sleeve 10 and the first strip brush 8. The end of the first connecting rod 11 hinged to the sleeve 10 is tilted away from the first hinge axis. The central shaft 6 is equipped with a limit ring 13 located on the side of the sleeve 10 close to the first hinge axis.

[0045] The two first connecting rods 11, the sliding sleeve 10 and the first strip brush 8 form a parallelogram structure, so that the first strip brush 8 can move while maintaining a horizontal state with the central axis 6. The elastic member 12 is used to push the sliding sleeve 10 to move close to the limiting ring 13. Because the end of the first strip brush 8 is hinged to the guide arm 7, when the elastic member 12 pushes the sliding sleeve 10 to slide, the angle between the first connecting rod 11 and the central axis 6 increases, and the first strip brush 8 moves away from the central axis 6 and is parallel until the sliding sleeve 10 contacts the limiting ring 13. At this time, the distance between the first strip brush 8 and the central axis 6 is the largest.

[0046] The central shaft 6 is provided with a plurality of positioning grooves 14 spaced apart along the length direction, and the limiting ring 13 is threadedly provided with positioning bolts 15 whose ends can be inserted into the corresponding positioning grooves 14 .

[0047] By adjusting the position of the limit ring 13 on the central axis 6, the maximum distance between the first strip brush 8 and the central axis 6 can be adjusted. The positioning bolt 15 is loosened so that the end of the positioning bolt 15 moves out from the corresponding positioning groove 14. The limit ring 13 is moved to slide on the central axis 6, and the positioning bolt 15 is rotated so that the end of the positioning bolt 15 is inserted into the corresponding positioning groove 14.

[0048] The central shaft 6 is fixedly provided with a mounting ring 16 located on the side of the sleeve 10 away from the limiting ring 13 . The elastic member 12 is a spring sleeved on the central shaft 6 . The two ends of the spring are in contact with the mounting ring 16 and the sleeve 10 , respectively.

[0049] The adjustment mechanism includes a mounting arm 17 fixedly mounted on the first strip brush 8 in the same length direction, a second connecting rod 18 hinged to the middle part of the second strip brush 9, an adjusting member 19 hinged to the end of the second connecting rod 18 away from the second strip brush 9 and slidably connected to the mounting arm 17, and a mounting bolt 20 mounted on the adjusting member 19 for fixing the adjusting member 19 on the mounting arm 17.

[0050] When it is necessary to adjust the angle between the first strip brush 8 and the second strip brush 9, loosen the mounting bolt 20, and the adjusting member 19 can slide on the mounting arm 17. When the adjusting member 19 slides on the mounting arm 17, it can drive the second strip brush 9 to rotate through the second connecting rod 18. Then tighten the mounting bolt 20 to fix the adjusting member 19 on the mounting arm 17, so that the angle between the first strip brush 8 and the second strip brush 9 can be fixed.

[0051] The mounting frame 5 is fixedly mounted with a strip slide 21 parallel to the central axis 6, and a slide 22 is slidably arranged on the strip slide 21. The end of the central axis 6 away from the shrinking mold 4 is mounted on the slide 22 through at least one shaft seat, and the mounting frame 5 is fixedly mounted with a cylinder 23 whose output end is fixedly connected to the slide 22;

[0052] The driving mechanism comprises a stepper motor 24 fixedly mounted on the sliding member 22 , a first gear is fixedly sleeved on the output shaft of the stepper motor 24 , and a second gear meshing with the first gear is fixedly sleeved on the central shaft 6 .

[0053] The stepper motor 24 starts to drive the first gear to rotate, and drives the central shaft 6 to rotate through the second gear, thereby driving the first strip brush 8 and the second strip brush 9 to rotate around the axis of the central shaft 6; the cylinder 23 is used to push the sliding member 22 to slide on the strip slide seat 21.

[0054] The oil replenishing mechanism includes an oil replenishing pipe 26 fixedly mounted on the mounting frame 5 through a supporting frame 25 and located directly on the strip slide 21. The oil replenishing pipe 26 is arranged parallel to the central axis 6. The lowest point of the oil replenishing pipe 26 is provided with a plurality of oil outlet holes arranged at intervals along the length direction.

[0055] Because the oil outlet hole is arranged downward, when the first strip brush 8 and the second strip brush 9 return to their original positions and move to just below the oil replenishment pipe 26 , the oil in the oil replenishment pipe 26 can drip downward onto the first strip brush 8 and the second strip brush 9 .

[0056] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0057] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0058] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An exhaust pipe shrinkage forming device, characterized in that: include: A base (1), a two-axis horizontal translation unit (2) mounted on the base (1), a clamping unit (3) mounted on the base (1) and used to clamp a steel pipe, a plurality of shrinking dies (4) mounted at equal intervals in the horizontal direction on the output end of the two-axis horizontal translation unit (2), and an oiling unit mounted on the base (1) and arranged side by side with the clamping unit (3) and used to brush oil on the inner wall of the corresponding shrinking dies (4); The oiling unit comprises a mounting frame (5), a central shaft (6) which is horizontally slidably mounted on the mounting frame (5) along its own axis and can be coaxially slidably inserted into the corresponding shrinking mold (4), a driving mechanism for driving the central shaft (6) to rotate around its own axis, a brushing mechanism mounted on the central shaft (6) and capable of contacting the inner wall of the shrinking mold (4), and an oil replenishing mechanism mounted on the mounting frame (5) for transporting oil to the brushing mechanism to restore it to its original position.

2. The exhaust pipe shrinkage forming equipment according to claim 1, characterized in that: The brushing mechanism comprises a first hinge shaft whose axial direction is perpendicular to the axial direction of the central shaft (6) and is installed on the inner end of the central shaft (6) so as to be inserted into the shrinking mold (4); a guide arm (7) whose one end is hinged to the first hinge shaft and whose other end is inclined away from the shrinking mold (4); a first strip brush (8) which is hinged to the end of the guide arm (7) away from the first hinge shaft through a second hinge shaft parallel to the first hinge shaft and is parallel to the central shaft (6); and a second strip brush (9) which is installed on the end of the first strip brush (8) away from the guide arm (7) through a third hinge shaft parallel to the second hinge shaft, wherein the end of the second strip brush (9) away from the first strip brush (8) is inclined away from the guide arm (7) and is arranged away from the central shaft (6); An adjusting mechanism connected to a side of the second strip brush (9) close to the central axis (6) is installed on the side of the first strip brush (8) close to the central axis (6) and is used to adjust the angle between the second strip brush (9) and the first strip brush (8); and an elastic reset mechanism connected to the first strip brush (8) and used to push the first strip brush (8) to move away from the central axis (6) is installed on the central axis (6).

3. The exhaust pipe shrinkage forming equipment according to claim 2, characterized in that: The elastic reset mechanism comprises a sliding sleeve (10) slidably sleeved on the central shaft (6) in a coaxial direction, at least two inclined first connecting rods (11) arranged in parallel and spaced apart along the length direction of the central shaft (6), and an elastic member (12) used to push the sliding sleeve (10) to slide close to the first hinge axis, the two ends of each first connecting rod (11) are respectively hinged to the sliding sleeve (10) and the first strip brush (8), the end of the first connecting rod (11) hinged to the sliding sleeve (10) is tilted away from the first hinge axis, and the central shaft (6) is equipped with a limiting ring (13) located on the side of the sliding sleeve (10) close to the first hinge axis.

4. The exhaust pipe shrinkage forming equipment according to claim 3, characterized in that: The central shaft (6) is recessed with a plurality of positioning grooves (14) arranged at intervals along the length direction, and the limiting ring (13) is threadedly mounted with positioning bolts (15) whose ends can be inserted into corresponding positioning grooves (14).

5. The exhaust pipe shrinkage forming equipment according to claim 4, characterized in that: A mounting ring (16) is fixedly mounted on the central shaft (6) and is located on a side of the sliding sleeve (10) away from the limiting ring (13). The elastic member (12) is a spring sleeved on the central shaft (6), and two ends of the spring are respectively in contact with the mounting ring (16) and the sliding sleeve (10).

6. The exhaust pipe shrinkage forming equipment according to claim 2, characterized in that: The adjustment mechanism comprises a mounting arm (17) fixedly mounted on the first strip brush (8) in the same length direction, a second connecting rod (18) hinged to the middle of the second strip brush (9), an adjustment member (19) hinged to the end of the second connecting rod (18) away from the second strip brush (9) and slidably connected to the mounting arm (17), and a mounting bolt (20) mounted on the adjustment member (19) for fixing the adjustment member (19) to the mounting arm (17).

7. The exhaust pipe necking forming equipment according to claim 1, characterized in that: A strip slide (21) parallel to the central axis (6) is fixedly mounted on the mounting frame (5); a sliding member (22) is slidably arranged on the strip slide (21); an end of the central axis (6) away from the shrinking mold (4) is mounted on the sliding member (22) via at least one shaft seat; and a cylinder (23) whose output end is fixedly connected to the sliding member (22) is fixedly mounted on the mounting frame (5); The driving mechanism comprises a stepper motor (24) fixedly mounted on a sliding member (22); a first gear is fixedly sleeved on an output shaft of the stepper motor (24); and a second gear meshing with the first gear is fixedly sleeved on the central shaft (6).

8. The exhaust pipe shrinkage forming equipment according to claim 7, characterized in that: The oil replenishing mechanism comprises an oil replenishing pipe (26) fixedly mounted on the mounting frame (5) through a supporting frame (25) and located directly on the strip slide seat (21); the oil replenishing pipe (26) is arranged parallel to the central axis (6); and a plurality of oil outlet holes arranged at intervals along the length direction are arranged at the lowest point of the oil replenishing pipe (26).

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