Outer salient point punching equipment for expanding horn mouth of copper pipe

Abstract

The utility model discloses an outer convex point punching device for a copper pipe flared opening, and relates to the technical field of copper pipe machining equipment. The device comprises a bottom plate, an L-shaped plate is fixedly connected to the rear end of the upper surface of the bottom plate, a machining assembly is arranged on a vertical supporting arm of the L-shaped plate, and a fixing assembly is further arranged at the front end of the upper surface of the bottom plate. The front end and the rear end of the first arc-shaped piece are driven by the bidirectional hydraulic cylinder in the machining assembly to move, so that the first arc-shaped piece rotates relative to the mounting rod, convex point machining is conveniently carried out on the horn mouth of the copper pipe, the problem that convex point machining is not conveniently carried out on the horn mouth of the copper pipe in the prior art is solved, and the machining efficiency is improved. The first hydraulic cylinder in the fixing assembly drives the U-shaped frame to rotate relative to the mounting base, the copper pipe fixed in the U-shaped frame is driven to rotate, and the problem that in the prior art, machining of multiple sets of convex points on the copper pipe is inconvenient is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of copper tube processing equipment, in particular to an external convex point punching equipment for expanding the bell mouth of a copper tube. Background Art

[0002] Copper tubes are a common material in our daily production and life. They are mainly used to transport fluids and protect internal wires and cables. In the use of copper tubes, in order to facilitate the connection of two copper tubes, the copper tubes are often expanded to increase the cross-sectional area of ​​one end of the copper tube to facilitate the connection between the copper tubes. At the same time, in order to position the connected copper tubes, an external convex point is generally set at the flared end of the copper tube, and an external concave point is set at the non-flared end of the copper tube. The copper tube is positioned by the gap between the external convex point and the external concave point. In order to facilitate the setting of external convex points on the copper tube, an external convex point device is generally used;

[0003] The existing document with publication number CN116213567A discloses a copper tube bending embossing machine, including a vibration plate, a material taking manipulator upper and lower cylinders, a material taking and removing cylinder, a product clamping cylinder, a product feeding cylinder, a product embossing clamping and positioning cylinder, a embossing servo motor and a material stripping cylinder;

[0004] However, it still has the following disadvantages in actual use:

[0005] In the above-mentioned embossing machine equipment, the product clamping cylinder is installed on the sliding guide rail, and the product feeding cylinder drives the product clamping cylinder to slide back and forth on the sliding guide rail, an upper pressing block is installed on the moving end of the product clamping cylinder, and a lower pressing block corresponding to the upper pressing block is installed on the mounting seat of the product clamping cylinder. The upper pressing block is driven to move by the product clamping cylinder, and the steel pipe is clamped and fixed by the cooperation between the upper pressing block and the lower pressing block, but it is not convenient to drive the steel pipe to rotate, and it is not convenient to process multiple groups of embossing points on the steel pipe;

[0006] The above-mentioned embossing machine equipment has an expansion mandrel whose fixed end is fixed to a mounting plate via a hollow fixing seat; an axial notch is provided in the axial middle of the expansion mandrel to divide the expansion mandrel into two parts, an upper part and an lower part; two embossments are respectively arranged on the outer surfaces of the embossing ends of the upper and lower parts; since the expansion mandrel is expanded by means of a top shaft, it can only perform embossing operations on the straight part of the steel pipe, but cannot perform embossing operations on the bell mouth of the steel pipe.

[0007] For this reason, we provide a kind of copper tube bell mouth outer convex point punching equipment, in order to solve the above-mentioned problem. Utility Model Content

[0008] The utility model aims to provide a device for making external convex points for expanding the bell mouth of a copper tube. The front end and the rear end of a first arc-shaped piece are respectively driven to move by a bidirectional hydraulic cylinder in a processing component, so that the first arc-shaped piece is rotated relative to a mounting rod, thereby facilitating the processing of external convex points on the bell mouth of the copper tube, thereby solving the existing problem that it is inconvenient to process external convex points on the bell mouth of the copper tube. The first hydraulic cylinder in the fixing component drives a U-shaped frame to rotate relative to a mounting seat, thereby driving the copper tube fixed in the U-shaped frame to rotate, thereby solving the existing problem that it is inconvenient to process multiple groups of convex points on the copper tube.

[0009] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0010] The utility model is a device for making external convex points for expanding the bell mouth of a copper tube, comprising a bottom plate, an L-shaped plate is fixedly connected to the rear end of the upper surface of the bottom plate, a processing component is arranged on the vertical support arm of the L-shaped plate, and a fixing component is also arranged on the front end of the upper surface of the bottom plate;

[0011] The rear end of the mounting rod in the processing assembly is fixedly connected to the front end surface of the vertical support arm of the L-shaped plate, and first arc-shaped pieces are arranged on both sides of the mounting rod, and protrusions are welded on the back surfaces of the first arc-shaped pieces. Through holes are opened in the transverse direction at the front and rear ends of the outer wall of the mounting rod, and bidirectional hydraulic cylinders are fixedly connected in the transverse direction inside the through holes, and the piston shafts of the bidirectional hydraulic cylinders are rotatably connected to the facing surfaces of the first arc-shaped pieces.

[0012] The bottom end of the mounting seat in the fixing assembly is fixedly connected to the front end of the upper surface of the base plate, the top of the mounting seat is rotatably connected to a U-shaped frame, the lower part of the outer walls on both sides of the mounting seat are rotatably connected to the first hydraulic cylinder, the piston shaft of the first hydraulic cylinder is movably connected to the bottom two sides of the U-shaped frame transverse support arm, a lower clamping block is welded to the top center position of the U-shaped frame transverse support arm, and side clamping blocks are movably connected to the upper two sides of the lower clamping block.

[0013] The utility model is further configured that the top and bottom rear ends of the mounting rod are both welded with reinforcing ribs, and the vertical support arms of the reinforcing ribs are fixedly connected to the vertical support arms of the L-shaped plate.

[0014] The utility model is further configured such that installation frames are fixedly connected to the outer walls on both sides of the installation rod, the front ends of the installation frames are movably connected to the second arc-shaped pieces, and the outer walls of the second arc-shaped pieces are provided with through grooves.

[0015] The utility model is further configured such that a driving motor is fixedly connected to an outer wall of a side of the mounting frame away from the mounting rod through a motor frame, an output shaft of the driving motor rotates through an outer wall of one side of the mounting frame and is fixedly connected to a screw rod, one end of the screw rod away from the driving motor is rotatably connected to an inner wall of the other side of the mounting frame, a slider is threadedly sleeved on the outer wall of the screw rod, and the rear end of the second arc-shaped piece is fixedly connected to the front end surface of the slider.

[0016] The utility model is further configured as follows: a mounting groove is provided on the top of the mounting seat, mounting holes are provided on the front and rear end surfaces inside the mounting groove, a connecting seat is welded at the bottom center position of the U-shaped frame transverse support arm, a rotating shaft is fixedly connected to the front and rear end surfaces of the connecting seat, and the end of the rotating shaft away from the connecting seat is rotatably connected to the inside of the mounting hole.

[0017] The utility model is further configured as follows: both sides of the bottom of the U-shaped frame transverse support arm are provided with slide grooves in the transverse direction, the interior of the slide groove is movably connected with a slide plate in the transverse direction, and the piston shaft of the first hydraulic cylinder is rotatably connected to the lower surface of the slide plate.

[0018] The utility model is further configured such that the second hydraulic cylinders are fixedly connected to the vertical support arms on both sides of the U-shaped frame, and the piston shafts of the second hydraulic cylinders are fixedly connected to the back surfaces of the side clamping blocks.

[0019] The utility model is further configured such that damping pads are bonded to the top of the lower clamping block and the facing surfaces of the side clamping blocks.

[0020] The utility model has the following beneficial effects:

[0021] The utility model sets a processing component. When it is necessary to perform external convex point processing on the bell mouth of the copper tube, the two-way hydraulic cylinder is started, and a back force is applied to the front end of the first arc-shaped piece by the front two-way hydraulic cylinder, so that the front end of the first arc-shaped piece moves in a direction away from the installation rod, and a reverse force is applied to the rear end of the first arc-shaped piece by the rear two-way hydraulic cylinder, so that the rear end of the first arc-shaped piece moves in a direction close to the installation rod. When the inclination degree of the first arc-shaped piece is consistent with the bell mouth, an external force is applied to the first arc-shaped piece by the two-way hydraulic cylinder at the same time, so that the first arc-shaped piece keeps an inclined state and approaches the bell mouth of the copper tube, and then the outer convex point processing is performed on the bell mouth of the copper tube through the convexity on the first arc-shaped piece, which is convenient for performing the external convex point processing work on the bell mouth of the copper tube.

[0022] The utility model arranges a fixing component, places the copper tube on the lower clamping block, and drives the side clamping block to move by the second hydraulic cylinder, so as to clamp the copper tube inside the U-shaped frame, and perform external convex point processing on the copper tube by the processing structure on the L-shaped plate. When it is necessary to perform external convex point processing on multiple positions of the copper tube, the first hydraulic cylinder is started, and reverse forces are applied to the two ends of the U-shaped frame by the first hydraulic cylinder, so that the U-shaped frame rotates relative to the mounting seat, thereby driving the copper tube to rotate, which is convenient for performing external convex point processing on different positions of the copper tube, and also reduces the workload of the staff, and its processing accuracy is higher.

[0023] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 The overall structure diagram of a device for making external convex points for expanding the bell mouth of a copper tube is shown;

[0026] Figure 2 It is a structural schematic diagram of the processing assembly of the utility model;

[0027] Figure 3 This is a structural disassembly diagram of the installation rod of the utility model;

[0028] Figure 4 This is a structural disassembly diagram of the installation frame of the utility model;

[0029] Figure 5 It is a structural schematic diagram of the fixing assembly of the utility model;

[0030] Figure 6 It is a structural schematic diagram of the mounting seat of the utility model;

[0031] Figure 7 It is a structural schematic diagram of the U-shaped frame of the utility model.

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] 1-bottom plate, 2-L-shaped plate, 3-processing component, 301-mounting rod, 301a-reinforcement rib, 302-through hole, 303-bidirectional hydraulic cylinder, 304-first arc-shaped piece, 305-protrusion, 306-mounting frame, 306a-motor frame, 306b-driving motor, 306c-screw rod, 306d-slider, 307-second arc-shaped piece, 307a-through groove, 4-fixing component, 401-mounting seat, 401a-mounting groove, 401b-mounting hole, 402-U-shaped frame, 402a-connecting seat, 402b-rotating shaft, 402c-slide groove, 402d-slide plate, 403-first hydraulic cylinder, 404-lower clamping block, 405-side clamping block, 405a-second hydraulic cylinder, 405b-damping pad. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Specific embodiment 1

[0035] See also Figure 1-4 As shown, it is the first embodiment of the utility model, which provides an external convex point device for expanding the bell mouth of a copper tube, including a base plate 1, an L-shaped plate 2 fixedly connected to the rear end of the upper surface of the base plate 1 and a processing component 3 arranged on the vertical support arm of the L-shaped plate 2, wherein the processing component 3 includes a mounting rod 301, a two-way hydraulic cylinder 303 and a first arc-shaped piece 304. The two-way hydraulic cylinder 303 applies forces in different directions to the front and rear ends of the first arc-shaped piece 304, so that the first arc-shaped piece 304 rotates relative to the mounting rod 301, thereby solving the existing problem of inconvenience in performing external convex point processing on the bell mouth of the copper tube.

[0036] Specifically, the rear end of the mounting rod 301 is fixedly connected to the front end surface of the vertical support arm of the L-shaped plate 2, and a first arc-shaped piece 304 is arranged on both sides of the mounting rod 301, and a protrusion 305 is welded on the back surface of the first arc-shaped piece 304. The front and rear ends of the outer wall of the mounting rod 301 are both horizontally provided with through holes 302, and the interior of the through holes 302 is horizontally fixedly connected with a two-way hydraulic cylinder 303, and the piston shafts of the two-way hydraulic cylinder 303 are rotatably connected to the opposite surfaces of the first arc-shaped piece 304. The setting of the mounting rod 301 and the through hole 302 realizes the installation of the two-way hydraulic cylinder 303, and the first arc-shaped piece 304 is driven to rotate and move by the two-way hydraulic cylinder 303. At the same time, in conjunction with the setting of the protrusion 305, the external convex point processing of the copper tube is realized.

[0037] Furthermore, the top and bottom rear ends of the mounting rod 301 are welded with reinforcing ribs 301a, and the vertical arms of the reinforcing ribs 301a are fixedly connected to the vertical arms of the L-shaped plate 2. The provision of the reinforcing ribs 301a increases the stability of the mounting rod 301.

[0038] The outer walls of both sides of the mounting rod 301 are fixedly connected with mounting frames 306, and the front ends of the mounting frames 306 are movably connected with second arc-shaped pieces 307, and the outer walls of the second arc-shaped pieces 307 are provided with through grooves 307a. The mounting frames 306 are used to install the second arc-shaped pieces 307, and the outer surface of the copper tube is fixed by the second arc-shaped pieces 307. At the same time, the through grooves 307a are in the same position as the protrusions 305 on the first arc-shaped pieces 304, and the through grooves 307a are provided to prevent the second arc-shaped pieces 307 from affecting the changes in the outer surface of the copper tube.

[0039] A driving motor 306b is fixedly connected to the outer wall of the mounting frame 306 on one side away from the mounting rod 301 through a motor frame 306a, and the output shaft of the driving motor 306b rotates and passes through the outer wall of one side of the mounting frame 306 and is fixedly connected to a screw rod 306c, and one end of the screw rod 306c away from the driving motor 306b is rotatably connected to the inner wall of the other side of the mounting frame 306, and a slider 306d is threadedly sleeved on the outer wall of the screw rod 306c, and the rear end of the second arc-shaped piece 307 is fixedly connected to the front end surface of the slider 306d. The motor frame 306a is used to install the driving motor 306b, and the screw rod 306c is driven to rotate through the setting of the driving motor 306b. At the same time, through the effect of the threaded connection between the screw rod 306c and the slider 306d, the second arc-shaped piece 307 moves relative to the mounting frame 306, so that the facing surface of the second arc-shaped piece 307 contacts the outer surface of the copper tube.

[0040] The operation process of this embodiment is as follows: when it is necessary to perform external convex point processing on the bell mouth of the copper tube, the two-way hydraulic cylinder 303 is first started, and the front two-way hydraulic cylinder 303 is used to apply a back force to the front end of the first arc-shaped piece 304, so that the front end of the first arc-shaped piece 304 moves in the direction away from the mounting rod 301, and the rear two-way hydraulic cylinder 303 is used to apply a relative force to the rear end of the first arc-shaped piece 304, so that the rear end of the first arc-shaped piece 304 moves in the direction close to the mounting rod 301. When the inclination degree of the first arc-shaped piece 304 is consistent with the bell mouth, the two-way hydraulic cylinder 303 is used to apply an external force to the first arc-shaped piece 304 at the same time, so that the first arc-shaped piece 304 maintains an inclined state and moves in the direction away from the mounting rod 301, and the protrusion 305 on the back surface of the first arc-shaped piece 304 is used to apply an external force to the inner wall of the bell mouth of the copper tube, thereby realizing the external convex point processing on the bell mouth of the copper tube. Specific embodiment 2

[0041] See also Figure 5-7 As shown, it is the second embodiment of the utility model, which is based on the previous embodiment, but is different from the previous embodiment in that: a fixing component 4 is also provided at the front end of the upper surface of the base plate 1, and the fixing component 4 includes a mounting seat 401, a U-shaped frame 402, a first hydraulic cylinder 403, a lower clamping block 404 and a side clamping block 405. The U-shaped frame 402 is driven to rotate by the first hydraulic cylinder 403, and the copper tube is driven to rotate, thereby solving the existing problem of inconvenience in processing external convex points at different positions of the copper tube.

[0042] Specifically, the bottom end of the mounting seat 401 is fixedly connected to the front end of the upper surface of the base plate 1, and the top of the mounting seat 401 is rotatably connected to a U-shaped frame 402, and the lower parts of the outer walls on both sides of the mounting seat 401 are rotatably connected to the first hydraulic cylinder 403, and the piston shafts of the first hydraulic cylinder 403 are movably connected to the bottom two sides of the horizontal support arm of the U-shaped frame 402, and a lower clamping block 404 is welded at the top center position of the horizontal support arm of the U-shaped frame 402, and the upper two sides of the lower clamping block 404 are movably connected to side clamping blocks 405, and the mounting seat 401 is used to install the U-shaped frame 402, and the U-shaped frame 402 is used to install the lower clamping block 404 and the side clamping block 405, and at the same time, the copper tube is clamped and fixed by the lower clamping block 404 and the side clamping block 405, and the first hydraulic cylinder 403 is used to apply external force to the U-shaped frame 402, so that the U-shaped frame 402 rotates relative to the mounting seat 401, thereby driving the copper tube to rotate.

[0043] Furthermore, a mounting groove 401a is provided on the top of the mounting seat 401, and mounting holes 401b are provided on the inner front and rear end surfaces of the mounting groove 401a, a connecting seat 402a is welded at the bottom center of the horizontal arm of the U-shaped frame 402, and a rotating shaft 402b is fixedly connected to the front and rear end surfaces of the connecting seat 402a, and one end of the rotating shaft 402b away from the connecting seat 402a is rotatably connected to the inside of the mounting hole 401b, and the arrangement of the mounting groove 401a and the connecting seat 402a realizes the rotatable installation between the mounting seat 401 and the U-shaped frame 402, and the rotatable installation between the mounting groove 401a and the connecting seat 402a is realized by the arrangement of the mounting hole 401b and the rotating shaft 402b;

[0044] Both sides of the bottom of the U-shaped frame 402 transverse support arm are provided with a slide groove 402c in the transverse direction, and a slide plate 402d is movably connected in the transverse direction inside the slide groove 402c, and the piston shaft of the first hydraulic cylinder 403 is rotatably connected to the lower surface of the slide plate 402d. The slide groove 402c is used to movably install the slide plate 402d, and the movably installation between the first hydraulic cylinder 403 and the U-shaped frame 402 is realized by the setting of the slide plate 402d;

[0045] The second hydraulic cylinder 405a is fixedly connected to the vertical arms on both sides of the U-shaped frame 402, and the piston shaft of the second hydraulic cylinder 405a is fixedly connected to the back surface of the side clamping block 405. The second hydraulic cylinder 405a is used to drive the U-shaped frame 402 to move, so as to clamp the two sides of the copper tube;

[0046] Damping pads 405b are bonded to the top of the lower clamping block 404 and the facing surfaces of the side clamping blocks 405. The provision of damping pads 405b increases the friction coefficient between the lower clamping block 404 and the side clamping block 405 and the copper tube, thereby strengthening the clamping and fixing of the copper tube by the lower clamping block 404 and the side clamping block 405.

[0047] The rest of the structure is the same as that of the first embodiment.

[0048] The operation process of this embodiment is as follows: first, the copper tube is placed on the lower clamp block 404, and the end of the copper tube to be processed is placed in the processing structure on the L-shaped plate 2, and at the same time, the side clamp block 405 is driven to move by the second hydraulic cylinder 405a to clamp the copper tube inside the U-shaped frame 402, and then the copper tube is processed with external convex points through the processing structure on the L-shaped plate 2, and when it is necessary to process the external convex points of multiple positions of the copper tube, the first hydraulic cylinder 403 is started, and the first hydraulic cylinder 403 applies reverse forces to the two ends of the U-shaped frame 402 respectively, so that the U-shaped frame 402 rotates relative to the mounting seat 401, thereby driving the copper tube to rotate, and the copper tube is processed with external convex points again through the processing structure.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A device for making external convex points for expanding the bell mouth of a copper tube, comprising a base plate (1), an L-shaped plate (2) being fixedly connected to the rear end of the upper surface of the base plate (1), characterized in that: A processing assembly (3) is provided on the vertical support arm of the L-shaped plate (2), and the rear end of the mounting rod (301) in the processing assembly (3) is fixedly connected to the front end surface of the vertical support arm of the L-shaped plate (2), first arc-shaped pieces (304) are provided on both sides of the mounting rod (301), and protrusions (305) are welded on the back surface of the first arc-shaped piece (304), through holes (302) are opened in the transverse direction at the front and rear ends of the outer wall of the mounting rod (301), and the inside of the through hole (302) is fixedly connected in the transverse direction with a bidirectional hydraulic cylinder (303), and the piston shaft of the bidirectional hydraulic cylinder (303) is rotatably connected to the facing surface of the first arc-shaped piece (304); A fixing assembly (4) is also provided at the front end of the upper surface of the base plate (1), and the bottom end of the mounting seat (401) in the fixing assembly (4) is fixedly connected to the front end of the upper surface of the base plate (1), the top of the mounting seat (401) is rotatably connected to a U-shaped frame (402), and the lower sides of the outer walls of the mounting seat (401) are rotatably connected to a first hydraulic cylinder (403), the piston shaft of the first hydraulic cylinder (403) is movably connected to the bottom sides of the transverse support arm of the U-shaped frame (402), and a lower clamping block (404) is welded at the top center position of the transverse support arm of the U-shaped frame (402), and the upper sides of the lower clamping block (404) are movably connected to side clamping blocks (405).

2. The device for making external convex points for expanding the bell mouth of a copper tube according to claim 1, characterized in that: Reinforcing ribs (301a) are welded to the top and bottom rear ends of the mounting rod (301), and the vertical support arms of the reinforcing ribs (301a) are fixedly connected to the vertical support arms of the L-shaped plate (2).

3. The device for making external convex points for expanding the bell mouth of a copper tube according to claim 2, characterized in that: The outer walls on both sides of the installation rod (301) are fixedly connected to installation frames (306), and the front ends of the installation frames (306) are movably connected to second arc-shaped pieces (307), and the outer walls of the second arc-shaped pieces (307) are provided with through grooves (307a).

4. The device for making external convex points for expanding the bell mouth of a copper tube according to claim 3, characterized in that: A driving motor (306b) is fixedly connected to an outer wall of the mounting frame (306) on one side away from the mounting rod (301) via a motor frame (306a), and an output shaft of the driving motor (306b) rotates through an outer wall of one side of the mounting frame (306) and is fixedly connected to a lead screw (306c), one end of the lead screw (306c) away from the driving motor (306b) is rotatably connected to an inner wall of the other side of the mounting frame (306), and a slider (306d) is threadedly sleeved on the outer wall of the lead screw (306c), and a rear end of the second arc-shaped piece (307) is fixedly connected to a front end surface of the slider (306d).

5. The device for making external convex points for expanding the bell mouth of a copper tube according to claim 1, characterized in that: The top of the mounting seat (401) is provided with a mounting groove (401a), and the inner front and rear end surfaces of the mounting groove (401a) are provided with mounting holes (401b); a connecting seat (402a) is welded at the bottom center position of the horizontal support arm of the U-shaped frame (402), and the front and rear end surfaces of the connecting seat (402a) are fixedly connected to a rotating shaft (402b), and one end of the rotating shaft (402b) away from the connecting seat (402a) is rotatably connected to the inside of the mounting hole (401b).

6. The device for making external convex points for expanding the bell mouth of a copper tube according to claim 1, characterized in that: Both sides of the bottom of the transverse support arm of the U-shaped frame (402) are provided with sliding grooves (402c) in the transverse direction, and the interior of the sliding groove (402c) is movably connected with a slide plate (402d) in the transverse direction, and the piston shaft of the first hydraulic cylinder (403) is rotatably connected to the lower surface of the slide plate (402d).

7. The device for making external convex points for expanding the bell mouth of a copper tube according to claim 1, characterized in that: The second hydraulic cylinder (405a) is fixedly connected to the vertical support arms on both sides of the U-shaped frame (402), and the piston shaft of the second hydraulic cylinder (405a) is fixedly connected to the back surface of the side clamping block (405).

8. The device for making external convex points for expanding the bell mouth of a copper tube according to claim 1, characterized in that: Damping pads (405b) are bonded to the top of the lower clamping block (404) and the facing surfaces of the side clamping blocks (405).

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