Dotting mechanism applied to hollow pipe fitting

Abstract

The utility model discloses a dotting mechanism applied to a hollow pipe fitting, which comprises a base, a lower clamping jig, an upper clamping jig and an oscillating rod, and the lower clamping jig is arranged on the base; the upper clamping jig is in transmission connection with a lifting driving mechanism, and the upper clamping jig is provided with a first dotting mold; the swing rod is rotationally installed on the base through a horizontal rotating shaft and provided with a core shaft, and the second rod section is in transmission connection with a swing driving mechanism. By the adoption of the structure, the lifting driving mechanism can drive the upper clamping jig to drive the first dotting die to extrude from the outer surface of the hollow pipe fitting to the interior of the hollow pipe fitting, so that concave points are formed in the hollow pipe fitting, or the swing driving mechanism drives the swing rod to swing and tilt upwards; and the second dotting mold extrudes outwards from the interior of the hollow pipe fitting, so that the hollow pipe fitting is dotted, two different dotting devices do not need to be purchased by an enterprise, and the production cost of the enterprise is reduced.

Description

Technical Field

[0001] The utility model relates to the field of pipe fitting production, in particular to a dotting mechanism applied to hollow pipe fittings. Background Art

[0002] As we all know, copper metal has good thermal conductivity and good ductility. Therefore, in daily production, many products are made of copper metal, including hollow pipe fittings made of copper metal, that is, copper tubes with a hollow interior. Copper tubes are often used in air-conditioning equipment. Copper tubes can be used as heat exchangers and refrigerant delivery pipelines for air-conditioning equipment. When making heat exchangers and refrigerant delivery pipelines, hollow copper tube fittings need to be processed by various mechanical processes, such as bending, punching, dotting, cutting and welding. The dotting process is to process a series of concave or convex points on the surface of the copper tube.

[0003] There are generally two types of equipment for marking copper pipe fittings on the market. One is for convex points, that is, during processing, it is necessary to squeeze from the inside of the copper pipe to form convex points, and the other is for concave points, that is, during processing, it is necessary to squeeze the outer surface of the copper pipe from the outside to form concave points on the outer surface of the copper pipe that are concave toward the inside of the copper pipe. Therefore, enterprises need to purchase two types of marking equipment, which is expensive and increases the burden on enterprises. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a dotting mechanism applied to a hollow pipe fitting, which can dot convex points or concave points on the hollow pipe fitting.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] According to certain embodiments of the utility model, a dotting mechanism applied to hollow pipe fittings includes a base, a lower clamping jig, an upper clamping jig and a swing rod, wherein the lower clamping jig is fixedly mounted on the base; the upper clamping jig is located above the lower clamping jig, and the upper clamping jig is transmission-connected to a lifting drive mechanism arranged on the base, and the lifting drive mechanism can drive the upper clamping jig to move along the up and down directions close to or away from the lower clamping jig, and the upper clamping jig is provided with a first dotting mold; the swing rod is rotatably mounted on the base through a horizontal rotating shaft, and the horizontal rotating shaft divides the swing rod into a first rod segment and a second rod segment, and the first rod segment is provided with a rod extending to the upper clamping jig and the lower clamping jig. The second rod segment is transmission-connected with a swing driving mechanism arranged on the base, and the core shaft is provided with a second dotting mold cooperating with the first dotting mold for dotting; wherein, when the hollow pipe fitting is sleeved on the outer periphery of the core shaft and the second dotting mold, the lifting driving mechanism can drive the upper clamping fixture to move downward and cooperate with the lower clamping fixture to clamp the hollow pipe fitting, and make the first dotting mold and the second dotting mold cooperate for dotting; or the lifting driving mechanism can drive the upper clamping fixture to move downward and cooperate with the lower clamping fixture to clamp the hollow pipe fitting, and the swing driving mechanism drives the swing rod to swing upward and tilt, so that the first dotting mold and the second dotting mold cooperate for dotting.

[0007] A beneficial effect of a dotting mechanism applied to hollow pipe fittings in certain embodiments of the utility model is as follows: a first dotting mold is provided on the upper clamping fixture, and a second dotting mold is provided on the core shaft to cooperate with the first dotting mold for dotting. According to actual needs, the lifting drive mechanism can drive the upper clamping fixture to drive the first dotting mold to squeeze from the outer surface of the hollow pipe fitting to the inside of the hollow pipe fitting, thereby achieving concave points on the hollow pipe fitting, or the swing drive mechanism drives the swing rod to swing upward and tilt, and causes the second dotting mold to squeeze from the inside of the hollow pipe fitting to the outside, thereby achieving convex points on the hollow pipe fitting. By adopting the above-mentioned structure, the dotting mechanism of the utility model can achieve convex points or concave points on hollow pipe fittings, without the need for enterprises to purchase two different dotting equipment, which helps to reduce the production costs of enterprises.

[0008] In some embodiments of the present invention, the upper surface of the lower clamping fixture is provided with a lower groove matched with the shape of the hollow pipe, and the lower surface of the upper clamping fixture is provided with an upper groove matched with the shape of the hollow pipe.

[0009] In certain embodiments of the present invention, the first dotting mold is a first columnar member detachably mounted on the upper clamping fixture, the first columnar member has a first protrusion protruding toward the lower clamping fixture, and the upper surface of the second dotting mold is provided with a second groove cooperating with the first protrusion for dotting.

[0010] In certain embodiments of the present invention, a first groove is formed on the lower surface of the first dotting mold, and the second dotting mold is a second cylindrical member detachably mounted on the core shaft, and a second protrusion that cooperates with the first groove for dotting is provided on the upper end of the second cylindrical member.

[0011] In certain embodiments of the utility model, the lifting drive mechanism is a first piston cylinder fixedly mounted on the base, and the first piston cylinder of the first piston cylinder is transmission-connected to the upper clamping fixture, wherein the first piston cylinder of the first piston cylinder can drive the upper clamping fixture to move and lift in the up and down directions.

[0012] In certain embodiments of the utility model, the swing drive mechanism includes a second piston cylinder, a horizontal moving part and a movable pin, the second piston cylinder is installed on the base, the horizontal moving part is movably installed on the base, the horizontal moving part is transmission-connected to the second piston rod of the second piston cylinder, the side wall of the horizontal moving part is provided with an inclined guide groove, the movable pin is movably installed in the inclined guide groove, and the movable pin is connected to the second rod segment; wherein, when the second piston cylinder drives the horizontal moving part to move horizontally relative to the base, the inclined guide groove and the movable pin can cooperate with each other and drive the first rod segment of the swing rod to swing upward or downward.

[0013] In certain embodiments of the utility model, the base is provided with a linear guide rail arranged in a horizontal direction, and a sliding groove adapted to the linear guide rail is opened at the bottom of the horizontal moving member, the linear guide rail is slidably installed in the sliding groove, and the horizontal moving member can reciprocate horizontally along the linear guide rail.

[0014] In certain embodiments of the utility model, a mounting groove is provided in the middle of the upper portion of the horizontal moving member, the inclined guide grooves are correspondingly provided on the two side walls opposite to the mounting groove, one end of the second rod segment is embedded in the mounting groove, the movable pin is arranged at the end of the second rod segment, and the two ends of the movable pin are correspondingly inserted into the inclined guide grooves on the two side walls opposite to the mounting groove.

[0015] In some embodiments of the present invention, the length of the first rod segment is smaller than the length of the second rod segment.

[0016] In certain embodiments of the present invention, the second piston cylinder is arranged along the horizontal direction and is located above the horizontal moving member, a connecting vertical plate is provided at one end of the horizontal moving member away from the lower clamping fixture, and the second piston rod of the second piston cylinder is transmission-connected to the connecting vertical plate; wherein the second piston cylinder can drive the connecting vertical plate to drive the horizontal moving member to reciprocate along the horizontal direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a structural schematic diagram of a dotting mechanism applied to a hollow pipe in some embodiments of the utility model;

[0019] Figure 2 for Figure 1 A cross-sectional view of a dotting mechanism applied to a hollow pipe for dotting a concave point, with the upper clamping fixture in a raised state;

[0020] Figure 3 for Figure 1 A cross-sectional view of a dotting mechanism applied to a hollow pipe when used for dotting concave dots is shown in FIG.

[0021] Figure 4 for Figure 1 A cross-sectional view of a dotting mechanism applied to a hollow pipe for dotting convex points, with the upper clamping fixture in a raised state;

[0022] Figure 5 for Figure 1 A cross-sectional view of a dotting mechanism applied to a hollow pipe for dotting convex points, with the upper clamping fixture in a lowered state;

[0023] Figure 6 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0024] Figure 7 for Figure 4 A magnified schematic diagram of point B in the middle. DETAILED DESCRIPTION

[0025] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0026] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present utility model, "several" means one or more, "more" means more than three, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] Reference Figures 1 to 7In some embodiments of the utility model, a dotting mechanism for a hollow pipe (hereinafter sometimes referred to as a dotting mechanism) is applied to the hollow pipe, including a base 100, a lower clamping fixture 200, an upper clamping fixture 300 and a swing rod 400. In this embodiment, the lower clamping jig 200 is fixedly installed on one end of the base 100, and the upper clamping jig 300 is correspondingly located above the lower clamping jig 200. The upper clamping jig 300 can move, rise or fall relative to the lower clamping jig 200 in the up and down directions. The base 100 is provided with a lifting drive mechanism 310, and the lifting drive mechanism 310 is transmission-connected to the upper clamping jig 300. The lifting drive mechanism 310 can drive the upper clamping jig 300 to move upward and rise away from the lower clamping jig 200, or the lifting drive mechanism 310 can drive the upper clamping jig 300 to move downward and fall close to the lower clamping jig 200. The upper clamping jig 300 is provided with a first dotting mold 320 at the lower end portion facing the lower clamping jig 200. The swing rod 400 is rotatably installed on the base 100 through a horizontal rotating shaft 410. The horizontal rotating shaft 410 divides the swing rod 400 into a first rod segment 401 and a second rod segment 402. The first rod segment 401 is provided with a core shaft 420 extending between the upper clamping fixture 300 and the lower clamping fixture 200. The core shaft 420 is provided with a second dotting mold 440 that cooperates with the first dotting mold 320 for dotting. In this embodiment, the base 100 is fixedly provided with a swing driving mechanism 430, and the swing driving mechanism 430 is transmission-connected to the second rod segment 402. Among them, when the hollow tube fitting 500 is sleeved on the outer periphery of the core shaft 420 and the second dotting mold 440, the lifting drive mechanism 310 can drive the upper clamping fixture 300 to move downward and cooperate with the lower clamping fixture 200 to clamp the hollow tube fitting 500, and make the first dotting mold 320 and the second dotting mold 440 cooperate to dot; or when the hollow tube fitting 500 is sleeved on the outer periphery of the core shaft 420 and the second dotting mold 440, the lifting drive mechanism 310 can drive the upper clamping fixture 300 to move downward and cooperate with the lower clamping fixture 200 to clamp the hollow tube fitting 500, and then the swing drive mechanism 430 drives the swing rod 400 to swing upward and tilt, so that the first dotting mold 320 and the second dotting mold 440 cooperate to dot.

[0030] The dotting mechanism of some embodiments of the utility model is provided with a first dotting mold 320 on the upper clamping fixture 300, and a second dotting mold 440 cooperating with the first dotting mold 320 for dotting is provided on the core shaft 420. According to actual production needs, the lifting drive mechanism 310 can drive the upper clamping fixture 300 to drive the first dotting mold 320 to squeeze from the outer surface of the hollow pipe fitting 500 to the inside of the hollow pipe fitting 500, thereby achieving concave points on the hollow pipe fitting 500, or the swing drive mechanism 430 drives the swing rod 400 to swing upward and tilt, and makes the second dotting mold 440 squeeze from the inside of the hollow pipe fitting 500 to the outside, thereby achieving convex points on the hollow pipe fitting 500. By adopting the above structure, the dotting mechanism of the utility model can achieve convex points or concave points on the hollow pipe fitting 500, without the need for the enterprise to purchase two different dotting equipment, which helps to reduce the production cost of the enterprise.

[0031] Reference Figure 1 , Figure 2 and Figure 3 In order to make the upper clamping fixture 300 and the lower clamping fixture 200 better cooperate to clamp the hollow pipe 500, in some embodiments of the present invention, the upper surface of the lower clamping fixture 200 is provided with a lower groove 201 adapted to the shape of the hollow pipe 500, and the lower surface of the upper clamping fixture 300 is provided with an upper groove 301 adapted to the shape of the hollow pipe. By adopting the above structure, when the lifting drive mechanism 310 drives the upper clamping fixture 300 to move downward and cooperate with the lower clamping fixture 200 to clamp the hollow pipe 500, the hollow pipe 500 can be correspondingly embedded in the upper groove 301 and the lower groove 201, so that the upper clamping fixture 300 and the lower clamping fixture 200 can better cooperate to clamp the hollow pipe 500, and at the same time, the hollow pipe 500 can be prevented from being clamped and deformed, which helps to protect the hollow pipe 500.

[0032] Reference Figure 1 , Figure 2 , Figure 3 and Figure 6 In order to facilitate the dotting mechanism of the present invention to dot the hollow pipe 500, in some embodiments of the present invention, the first dotting mold 320 is a first cylindrical member detachably mounted on the upper clamping fixture 300, and the first cylindrical member has a first protrusion 321 protruding toward the lower clamping fixture 200. The upper surface of the second dotting mold 440 is provided with a second groove 441 that cooperates with the first protrusion 321 for dotting. In this embodiment, the second dotting mold 440 and the core shaft 420 are an integrated structure. Of course, the second dotting mold 440 and the core shaft 420 can also be two independent components, which can be determined according to actual needs.

[0033] When the hollow pipe fitting 500 is sleeved on the outer periphery of the core shaft 420 and the second dotting mold 440, the lifting drive mechanism 310 drives the upper clamping fixture 300 to move downward and cooperates with the lower clamping fixture 200 to clamp the hollow pipe fitting 500. Since the first protrusion 321 of the first dotting mold 320 protrudes downward, during this process, the first protrusion 321 squeezes the outer peripheral wall of the hollow pipe fitting 500 and makes the outer peripheral wall of the hollow pipe fitting 500 recessed into the second groove 441 of the second dotting mold 440. Therefore, the outer peripheral wall of the hollow pipe fitting 500 can form a concave point, thereby meeting the production needs of the enterprise.

[0034] Reference Figure 4 , Figure 5 and Figure 7 In order to facilitate the dotting mechanism of the present invention to dot the hollow pipe 500, in some embodiments of the present invention, a first groove 322 is provided on the lower surface of the first dotting mold 320. In this embodiment, the first dotting mold 320 and the upper clamping fixture 300 are an integrated structure. Of course, the first dotting mold 320 and the upper clamping fixture 300 can also be a separate structure, which can be determined according to actual needs. The second dotting mold 440 is a second cylindrical member that can be detachably mounted on the core shaft 420. The upper end of the second cylindrical member is provided with a second protrusion 442 that cooperates with the first groove 322 for dotting.

[0035] When the hollow tube fitting 500 is sleeved on the outer periphery of the core shaft 420 and the second dotting mold 440, the lifting drive mechanism 310 drives the upper clamping fixture 300 to move downward and cooperate with the lower clamping fixture 200 to clamp the hollow tube fitting 500, and then the swing drive mechanism 430 drives the swing rod 400 to swing upward and tilt. At this time, the core shaft 420 drives the second columnar member to swing upward, and the second protrusion 442 of the second columnar member can squeeze the inner wall of the hollow tube fitting 500 from the inside of the hollow tube fitting 500. At this time, the side wall of the hollow tube fitting 500 arches outward and is embedded in the first groove 322 of the first dotting mold 320, so that the side wall of the hollow tube fitting 500 forms an outwardly arched convex point, thereby completing the purpose of dotting the hollow tube fitting 500, and the operation is simple and convenient.

[0036] Reference Figures 1 to 6 In order to simplify the structure of the dotting mechanism, in some embodiments of the present invention, the lifting drive mechanism 310 is a first piston cylinder fixedly mounted on the base 100, and specifically, the first piston cylinder can be a pneumatic cylinder or a hydraulic cylinder. The first piston cylinder of the first piston cylinder is transmission-connected to the upper clamping fixture 300, wherein the first piston cylinder of the first piston cylinder can drive the upper clamping fixture 300 to move up and down. By adopting the above structure, the structure of the dotting mechanism can be greatly simplified, and the production of the dotting mechanism is convenient.

[0037] It should be noted that the above-mentioned lifting drive mechanism 310 is also configured as an electric push rod fixedly installed on the base 100, and the extended end of the electric push rod is transmission-connected to the upper clamping fixture 300. At this time, the electric push rod can drive the upper clamping fixture 300 to move upward and rise or move downward and fall.

[0038] Reference Figures 1 to 5 In order to make the structure of the swing drive mechanism 430 more compact, in some embodiments of the utility model, the swing drive mechanism 430 includes a second piston cylinder 431, a horizontal moving member 432 and a movable pin 433. The second piston cylinder 431 is installed on the base 100. In this embodiment, the second piston cylinder 431 is a cylinder or a hydraulic cylinder. The horizontal moving member 432 is movably installed on the base 100, and the horizontal moving member 432 is connected to the second piston rod of the second piston cylinder 431 by transmission. The side wall of the horizontal moving member 432 is provided with an inclined guide groove 4321, and the movable pin 433 is movably installed in the inclined guide groove 4321, and the movable pin 433 is connected to the second rod section 402; wherein, when the second piston cylinder 431 drives the horizontal moving member 432 to move horizontally relative to the base 100, the inclined guide groove 4321 and the movable pin 433 can cooperate with each other and drive the first rod section 401 of the swing rod 400 to swing upward or downward. By adopting the above structure, the structure of the swing drive mechanism 430 can be made simpler, which is convenient for production and manufacturing, and helps to reduce production costs.

[0039] Furthermore, in order to reduce the load of the second piston cylinder 431, in some embodiments of the present invention, the length of the first rod segment 401 is less than the length of the second rod segment 402. Specifically, the length of the second rod segment 402 is two or three times the length of the first rod segment 401. At this time, the lever arm length of the second rod segment 402 is longer than the lever arm length of the first rod segment 401. Therefore, the second piston cylinder 431 can apply a smaller force, that is, the first rod segment 401 can be driven to swing upward through the cooperation of the horizontal moving member 432 and the movable pin 433, which helps to reduce the load of the second piston cylinder 431.

[0040] It should be noted that in addition to the above-mentioned structure, the swing drive mechanism 430 may also adopt other structures. For example, the swing drive mechanism 430 is a piston cylinder, one end of which is rotatably installed on the base 100, and the piston rod of the piston cylinder is rotatably connected to the second rod segment 402. At this time, when the piston cylinder is working, it can also drive the first rod segment 401 of the swing rod 400 to swing upward or downward.

[0041] Furthermore, the base 100 is provided with a linear guide rail 110 arranged in the horizontal direction, and a sliding groove 4320 adapted to the linear guide rail 110 is provided at the bottom of the horizontal moving member 432. The linear guide rail 110 is slidably mounted in the sliding groove 4320, and the horizontal moving member 432 can reciprocate horizontally along the linear guide rail 110. Furthermore, the linear guide rail 110 is a dovetail guide rail, and the sliding groove 4320 is a dovetail groove. By adopting the above structure, the horizontal movement of the horizontal moving member 432 can be made more stable.

[0042] Reference Figures 1 to 5 In order to facilitate the assembly of the second rod segment 402 and the horizontal moving member 432, in some embodiments of the present utility model, a mounting groove 4322 is provided in the middle of the upper part of the horizontal moving member 432, and the two opposite side walls of the mounting groove 4322 are correspondingly provided with inclined guide grooves 4321, one end of the second rod segment 402 is embedded in the mounting groove 4322, and a movable pin 433 is provided at the end of the second rod segment 402, and the two ends of the movable pin 433 are correspondingly inserted into the inclined guide grooves 4321 of the two opposite side walls of the mounting groove 4322. By adopting the above structure, the assembly connection between the second rod segment 402 and the horizontal moving member 432 can be made more firm, and the force can be more stable.

[0043] Furthermore, in order to facilitate the transmission connection between the second piston cylinder 431 and the horizontal moving member 432, in some embodiments of the present utility model, the second piston cylinder 431 is arranged along the horizontal direction and is located above the horizontal moving member 432, and a connecting vertical plate 434 is provided at one end of the horizontal moving member 432 away from the lower clamping fixture 200, and the second piston rod of the second piston cylinder 431 is transmission-connected to the connecting vertical plate 434; wherein, the second piston cylinder 431 can drive the connecting vertical plate 434 to drive the horizontal moving member 432 to reciprocate along the horizontal direction. By adopting the above structure, it is helpful to simplify the transmission connection structure between the second piston cylinder 431 and the horizontal moving member 432.

[0044] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A dotting mechanism for a hollow pipe, characterized in that: include: Base (100); A lower clamping fixture (200) fixedly mounted on the base (100); An upper clamping jig (300) is located above the lower clamping jig (200), the upper clamping jig (300) is transmission-connected to a lifting drive mechanism (310) disposed on the base (100), the lifting drive mechanism (310) can drive the upper clamping jig (300) to move in an up-down direction toward or away from the lower clamping jig (200), and the upper clamping jig is provided with a first dotting mold (320); A swing rod (400), the swing rod (400) is rotatably mounted on the base (100) via a horizontal rotation axis (410), the horizontal rotation axis (410) divides the swing rod (400) into a first rod section (401) and a second rod section (402), the first rod section (401) is provided with a core shaft (420) extending between the upper clamping fixture (300) and the lower clamping fixture (200), the second rod section (402) is transmission-connected to a swing driving mechanism (430) provided on the base (100), and the core shaft (420) is provided with a second dotting mold (440) cooperating with the first dotting mold (320) for dotting; When the hollow pipe is sleeved on the outer circumference of the core shaft (420) and the second dotting mold (440), The lifting drive mechanism (310) is capable of driving the upper clamping fixture (300) to move downward and cooperate with the lower clamping fixture (200) to clamp the hollow pipe, and enables the first dotting mold (320) and the second dotting mold (440) to cooperate in dotting; or The lifting drive mechanism (310) can drive the upper clamping fixture (300) to move downward and cooperate with the lower clamping fixture (200) to clamp the hollow pipe, and the swing drive mechanism (430) drives the swing rod (400) to swing upward, so that the first dotting mold (320) and the second dotting mold (440) cooperate to dot.

2. A dotting mechanism for a hollow pipe according to claim 1, characterized in that: The upper surface of the lower clamping fixture (200) is provided with a lower groove (201) adapted to the shape of the hollow pipe, and the lower surface of the upper clamping fixture (300) is provided with an upper groove (301) adapted to the shape of the hollow pipe.

3. The dotting mechanism for hollow pipes according to claim 1, characterized in that: The first dotting mold (320) is a first columnar member detachably mounted on the upper clamping fixture (300), the first columnar member having a first protruding portion (321) protruding toward the lower clamping fixture (200), and the upper surface of the second dotting mold (440) is provided with a second groove (441) cooperating with the first protruding portion (321) for dotting.

4. The dotting mechanism for hollow pipes according to claim 1, characterized in that: The lower surface of the first dotting mold (320) is provided with a first groove (322), and the second dotting mold (440) is a second columnar member detachably mounted on the core shaft (420), and the upper end of the second columnar member is provided with a second protrusion (442) that cooperates with the first groove (322) for dotting.

5. The dotting mechanism for hollow pipes according to claim 1, characterized in that: The lifting drive mechanism (310) is a first piston cylinder fixedly mounted on the base (100), and the first piston cylinder of the first piston cylinder is drivingly connected to the upper clamping fixture (300). The first piston cylinder of the first piston cylinder can drive the upper clamping fixture (300) to move up and down.

6. The dotting mechanism for hollow pipes according to claim 1, characterized in that: The swing drive mechanism (430) comprises a second piston cylinder (431), a horizontal moving member (432) and a movable pin (433); the second piston cylinder (431) is mounted on the base (100); the horizontal moving member (432) is movably mounted on the base (100); the horizontal moving member (432) is transmission-connected to a second piston rod of the second piston cylinder (431); an inclined guide groove (4321) is provided on a side wall of the horizontal moving member (432); the movable pin (433) is movably mounted on the inclined guide groove (4321); and the movable pin (433) is connected to the second rod section (402); When the second piston cylinder (431) drives the horizontal moving member (432) to move horizontally relative to the base (100), the inclined guide groove (4321) and the movable pin (433) can cooperate with each other and drive the first rod section (401) of the swing rod (400) to swing upward or downward.

7. The dotting mechanism for hollow pipes according to claim 6, characterized in that: The base (100) is provided with a linear guide rail (110) arranged in a horizontal direction, and a sliding groove (4320) adapted to the linear guide rail (110) is provided at the bottom of the horizontal moving member (432), and the linear guide rail (110) is slidably installed in the sliding groove (4320), and the horizontal moving member (432) can move back and forth horizontally along the linear guide rail (110).

8. The dotting mechanism for hollow pipes according to claim 6, characterized in that: A mounting groove (4322) is provided in the middle of the upper part of the horizontal moving member (432), and the inclined guide grooves (4321) are correspondingly provided on the two opposite side walls of the mounting groove (4322), one end of the second rod section (402) is embedded in the mounting groove (4322), and the movable pin (433) is arranged at the end of the second rod section (402), and the two ends of the movable pin (433) are correspondingly inserted into the inclined guide grooves (4321) on the two opposite side walls of the mounting groove (4322).

9. A dotting mechanism for a hollow pipe according to claim 6, 7 or 8, characterized in that: The second piston cylinder (431) is arranged along the horizontal direction and is located above the horizontal moving member (432); a connecting vertical plate (434) is provided at one end of the horizontal moving member (432) away from the lower clamping fixture (200); and a second piston rod of the second piston cylinder (431) is transmission-connected to the connecting vertical plate (434); The second piston cylinder (431) is capable of driving the connecting vertical plate (434) to drive the horizontal moving member (432) to reciprocate along the horizontal direction.

10. The dotting mechanism for hollow pipes according to claim 1, characterized in that: The length of the first rod segment (401) is smaller than the length of the second rod segment (402).

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