Hole puller and equal-diameter hole pulling equipment with hole puller

Abstract

The utility model relates to the technical field of copper pipe hole drawing, in particular to a hole drawing device and equal-diameter hole drawing equipment with the hole drawing device, which comprises a horizontally arranged large-diameter shaft, an inner pin hole for a locking pin to penetrate through is arranged on the outer side wall of the large-diameter shaft, a step reducing section is integrally formed at the right end of the large-diameter shaft, and a hole drawing hole is formed in the step reducing section. A small-diameter section is integrally formed at the right end of the stepped reducing section, a drag hook piece is integrally formed at the right end of the small-diameter section, and the size of the right end of the drag hook piece is larger than the inner diameter size of a hole opening of a hole to be drawn in the outer side wall of the red copper pipe. The hole drawing device is simple in overall structure and integrally machined and formed, can be directly installed in a hole opening to be drawn in the outer side wall of a red copper pipe in a matched mode for use, and can be matched with external rotating force and pulling force to achieve outward rapid hole drawing in a rotating and turning mode, the hole drawing efficiency is effectively improved, parts need to be disassembled after hole drawing, and the cost is reduced. Compared with a traditional hole puller, the operation steps are greatly simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to copper pipe hole pulling technical field especially a hole puller and equal diameter hole pulling equipment with the hole puller. BACKGROUND

[0002] Red copper pipe is a non-ferrous metal pipe material, which is mainly composed of copper and a small amount of impurities, and has many excellent properties. Red copper pipe is also an ideal material for refrigerant pipelines in air conditioners and refrigeration equipment.

[0003] In the process of red copper pipe installation and construction, in order to meet the needs of connecting other components and adapt to different pipe diameter pipeline systems, it is usually necessary to pull the hole of the copper pipe. The main steps of the current red copper pipe hole pulling operation are as follows:

[0004] The mold piece is placed inside the red copper pipe, and then the screw is screwed inward from the outside of the hole part (the outer diameter of the mold is slightly larger than the inner diameter of the current hole part) that needs to be pulled out, so that the mold placed in the pipe is connected and fastened with the external screw (the specific structure is shown in Figure 1 The mold is pulled out from the inside of the red copper pipe by the tensioning equipment in the workshop, thereby achieving the hole pulling effect of the current hole part.

[0005] However, the processing method in the prior art has the following problems: first, the operation efficiency is low, not only the mold piece needs to be placed in place in advance, but also the hole pulling power equipment with telescopic function needs to be connected with the screw, and the mold needs to be disassembled after the hole pulling is completed, which is relatively complicated; second, the operation difficulty is large, when the hole pulling part is located at the side wall part of the red copper pipe with long length, it is difficult to accurately place the mold in place, and it takes a long time.

[0006] Therefore, the utility model optimizes and improves the hole pulling mold of the red copper pipe in the prior art, and a new hole puller and equal diameter hole pulling equipment with the hole puller are designed. CONTENT OF UTILITY MODEL

[0007] The utility model discloses a hole puller, including the horizontal arrangement big diameter axle, the left end cooperation of big diameter axle is inserted in the positioning blind hole, the inside pin hole that is crossed is provided with the locking pin on the outer side wall of big diameter axle, the right end of big diameter axle is integrative and forms the step variable diameter section, the right end of step variable diameter section is integrative and forms the small diameter section, the right end of small diameter section is integrative and forms the draw hook spare, the right end of draw hook spare reaches the hole of the red copper pipe outer side wall on the hole of the hole that waits for pulling out, the right end size of draw hook spare is greater than the inner diameter size of the hole of the red copper pipe outer side wall on the hole that waits for pulling out.

[0008] Preferably in any of the above solutions, the pull hook piece comprises a protruding section integrally formed at the right end of the small-diameter section, the left end of the protruding section has a smaller outer diameter than the right end, the right end of the protruding section is symmetrically arranged on both sides, and a through opening slot is arranged on one side of the protruding section.

[0009] The utility model discloses still provide a kind of equal-diameter hole pulling equipment, including the slide rail of fixed installation in the left side of operating platform top, slide seat is slidably fitted on the top of the slide rail, the left side of the slide seat is connected with the external configuration telescopic power, power hole pulling mechanism is installed on the top of the slide seat, workpiece positioning mechanism is fixedly installed on the right end of the power hole pulling mechanism, the workpiece positioning mechanism is used to realize the clamping positioning of red copper pipe, hole puller is clamped and installed on the right end working end of the power hole pulling mechanism, the right end of the hole puller is working end and its end portion extends to the orifice of the clamped and positioned red copper pipe outer side wall in the hole to be pulled, under the action of external telescopic power, the power hole pulling mechanism follows slide seat and realizes horizontal displacement.

[0010] Preferably in any of the above solutions, the power hole pulling mechanism comprises a rotary motor fixedly installed on the top of the slide seat, a rotary disc is fixedly installed at the right end of the motor shaft of the rotary motor, a rotating shaft is coaxially fixedly connected to the right end of the rotary disc, a positioning blind hole is arranged at the right end of the rotating shaft for the left end of the hole puller to be inserted, a locking pin is inserted and fitted on the outer side wall of the rotating shaft at the position of the positioning blind hole, and the two ends of the locking pin pass through the hole puller and extend to the outside of the rotating shaft.

[0011] Preferably in any of the above solutions, the hole puller comprises a large-diameter shaft arranged horizontally, the left end of the large-diameter shaft is inserted and fitted in the positioning blind hole, an inner pin hole is arranged on the outer side wall of the large-diameter shaft for the locking pin to pass through, a stepped reducing section is integrally formed at the right end of the large-diameter shaft, a small-diameter section is integrally formed at the right end of the stepped reducing section, a pull hook piece is integrally formed at the right end of the small-diameter section, the right end of the pull hook piece extends to the orifice of the clamped and positioned red copper pipe outer side wall in the hole to be pulled, and the right end of the pull hook piece is larger than the inner diameter of the orifice of the clamped and positioned red copper pipe outer side wall in the hole to be pulled.

[0012] Preferably in any of the above solutions, the pull hook piece comprises a protruding section integrally formed at the right end of the small-diameter section, the left end of the protruding section has a smaller outer diameter than the right end, the right end of the protruding section is symmetrically arranged on both sides, and a through opening slot is arranged on one side of the protruding section.

[0013] Preferably in any of the above solutions, the outer side edges of the protruding section are all provided with rounded surfaces.

[0014] Preferably in any of the above solutions, the workpiece positioning mechanism comprises a fixed clamping seat fixedly installed on the top of the operating table on the right side of the slide rail, a fixed semicircular opening for placing the outer side wall curve of the red copper pipe is arranged on the right end face of the fixed clamping seat, a center alignment hole is arranged on the fixed clamping seat on the left side of the center of the fixed semicircular opening and is arranged in a penetrating manner, the center alignment hole is aligned with the center of the hole of the red copper pipe to be tapped, the diameter of the center alignment hole is larger than the maximum external dimension of the drawhook, a movable clamping seat is arranged on the right side of the fixed clamping seat and is arranged opposite to the fixed clamping seat, the movable clamping seat is matched with the fixed clamping seat to clamp and position the outer side wall of the red copper pipe, a bearing seat is fixedly installed on the top of the operating table on the right side of the movable clamping seat, a pressing shaft is matched and installed in the shaft hole of the bearing seat, the left end of the pressing shaft is fixed in the middle part of the right side wall of the movable clamping seat, and the right end of the pressing shaft is connected with an external hydraulic cylinder and follows to realize left-right telescopic movement.

[0015] Preferably in any of the above solutions, the included angle between the center axis of the through opening groove and the center axis of the small-diameter shaft is 100°-140°.

[0016] Preferably in any of the above solutions, the drawhook is made of a blank.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] 1. The whole structure of the hole pulling device is simple and integrally formed, can be directly installed in the hole to be tapped on the outer side wall of the red copper pipe, realizes fast hole pulling outside by rotating and changing direction, effectively improves the hole pulling efficiency, and needs to disassemble the parts after hole pulling, so that the operation steps are greatly simplified compared with the traditional hole pulling device.

[0019] 2. The hole pulling device can change the inclination angle to quickly place the drawhook at the right end of the hole pulling device in the hole to be tapped and realize horizontal centering, then the left end of the hole pulling device is directly connected with the equal-diameter hole pulling equipment, and then the rotating power and telescopic power are started to complete hole pulling by rotating and moving.

[0020] 3. The hole pulling device is quickly positioned by the plug-in connection and pin connection when being installed and matched with the equal-diameter hole pulling equipment, effectively ensures the firmness of the connection, and improves the firmness of the whole hole pulling device when following the rotation and movement.

[0021] 4. The equal-diameter hole pulling device can complete the clamping and positioning of the red copper pipe workpiece by the workpiece positioning mechanism when pulling the hole, and can realize the left hole pulling of the pulling device in the rotating state by the left pulling of the power hole pulling mechanism and the rotating drive after positioning, and can realize the hole pulling operation by the larger inner diameter size of the right end of the pulling device than the hole. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, each element or component is not necessarily drawn according to the actual proportion.

[0023] Figure 1 It is a schematic diagram of the structure of the pulling device in the prior art for the hole pulling operation of the red copper pipe.

[0024] Figure 2 It is a schematic diagram of the structure of the equal-diameter hole pulling device of the utility model.

[0025] Figure 3 It is a schematic diagram of the structure of the equal-diameter hole pulling device of the utility model. Figure 2

[0026] Figure 4 It is a schematic diagram of the internal structure of the pulling device after installation in the top view state.

[0027] Figure 5 It is a three-dimensional structure schematic diagram of the pulling device of the utility model from the first perspective.

[0028] Figure 6 It is a three-dimensional structure schematic diagram of the pulling device of the utility model from the second perspective.

[0029] Figure 7 It is a schematic diagram of the top view structure of the utility model.

[0030] Figure 8 It is a schematic diagram of the local enlarged structure of the pulling device. Figure 2

[0031] In the drawings, 1 is an operation table, 2 is a sliding rail, 3 is a sliding seat, 4 is a red copper pipe, 5 is a hole pulling device, 501 is a large-diameter shaft, 502 is an inner pin hole, 503 is a stepped variable-diameter section, 504 is a small-diameter section, 505 is a protruding section, 506 is a through opening slot, 507 is a rounded surface, 6 is a hole, 7 is a rotating motor, 8 is a rotating disc, 9 is a rotating shaft, 10 is a positioning blind hole, 11 is a locking pin, 12 is a fixed clamping seat, 13 is a fixed semicircular opening, 14 is a center alignment hole, 15 is a moving clamping seat, 16 is a bearing seat, 17 is a pressing shaft, and 18 is an existing hole pulling device. DETAILED DESCRIPTION ​​

[0032] The embodiments of the technical scheme of the utility model will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, therefore only as an example, and cannot limit the protection scope of the utility model. The specific structure of the utility model is shown in Figures 2-8 .

[0033] Embodiment 1: a hole puller, including horizontally arranged large diameter shaft 501, the left end of the large diameter shaft 501 is matched and installed in the positioning blind hole 10, the inner pin hole 502 for the locking pin 11 is arranged on the outer side wall of the large diameter shaft, the stepped reducing section 503 is integrally formed at the right end of the large diameter shaft 501, the small diameter section 504 is integrally formed at the right end of the stepped reducing section 503, the draw hook piece is integrally formed at the right end of the small diameter section 504, the right end of the draw hook piece extends to the hole 6 on the outer side wall of the red copper pipe 4 to be pulled, and the right end of the draw hook piece is larger than the inner diameter size of the hole 6 on the outer side wall of the red copper pipe 4 to be pulled.

[0034] The hole puller 5 designed in the utility model can directly extend into the hole 6 of the red copper pipe 4 to be pulled when performing the hole pulling operation, avoids the problem that the traditional hole puller 5 needs to adopt the separated combination type hole puller 5, and avoids the complicated assembly and disassembly operation before and after pulling the hole. The left end of the large diameter section is connected with power, so that the hole pulling operation can be quickly performed, and the hole pulling efficiency and reliability are improved.

[0035] In any of the above schemes, preferably, the draw hook piece includes a protruding section 505 integrally formed at the right end of the small diameter section 504, the left end outer diameter of the protruding section 505 is smaller than the right end outer diameter, the right end of the protruding section 505 is symmetrically arranged on both sides, a through opening slot 506 is arranged on one side of the protruding section 505, and the left end of the through opening slot 506 is open.

[0036] The draw hook piece designed in the utility model can be first deeply inserted into the hole 6 of the red copper pipe 4 by relying on the opening end of the obliquely arranged through opening slot 506 when in use, then rotated and inserted, and finally placed in the lumen of the red copper pipe 4 at the position of the hole 6.

[0037] Embodiment 2: an equal-diameter hole pulling device, comprising a slide rail 2 fixedly installed on the top left side of an operating table 1, a slide base 3 is slidingly fitted on the top of the slide rail 2, the left side of the slide base 3 is connected with an externally configured telescopic power, a power hole pulling mechanism is installed on the top of the slide base 3, a workpiece positioning mechanism is fixedly installed on the operating table 1 at the right end of the power hole pulling mechanism, the workpiece positioning mechanism is used for realizing clamping and positioning of a red copper pipe 4, a hole puller 5 is clamped and installed at the right end of the working end of the power hole pulling mechanism, the right end of the hole puller 5 is the working end, and the end thereof extends to a hole 6 on the outer side wall of the red copper pipe 4 to be pulled, and the power hole pulling mechanism follows the slide base 3 to realize horizontal displacement under the action of the external telescopic power.

[0038] The equal-diameter hole pulling device in the utility model is used in cooperation with the hole puller 5, can provide an installation position for the hole puller 5 and a fixed position for the red copper pipe 4 workpiece, thereby ensuring the whole hole pulling operation, and the positioning of the red copper pipe 4 workpiece is completed by the workpiece positioning mechanism before hole pulling, so that the hole 6 on the outer side wall of the red copper pipe 4 to be pulled is oriented towards the power hole pulling mechanism and coaxially arranged with the rotating shaft 9 of the power hole pulling mechanism, then the hole puller 5 is installed, the left end of the hole puller 5 is inserted into the interior of the power hole pulling mechanism and is locked by pin connection, the power hole pulling mechanism is started and kept in high-speed rotation, then the slide base 3 and the components thereon are pulled and moved by the left external pulling device while keeping the rotating state, finally the hole puller 5 in the high-speed rotating state is quickly driven to move left, the fast hole pulling is realized, and since the maximum size of the hole puller 5 is slightly larger than the inner diameter of the hole 6, the hole pulling operation can be smoothly performed due to the certain ductility of the red copper pipe 4.

[0039] In any of the above schemes, preferably, the power hole pulling mechanism comprises a rotating motor 7 fixedly installed on the top of the slide base 3, a rotating disc 8 is fixedly installed at the right end of the motor shaft of the rotating motor 7, a rotating shaft 9 is coaxially and fixedly connected to the right end of the rotating disc 8, a positioning blind hole 10 is arranged at the right end of the rotating shaft 9 for inserting the left end of the hole puller 5, a locking pin 11 is fitted and inserted on the outer side wall of the rotating shaft 9 at the position of the positioning blind hole 10, and the two ends of the locking pin 11 pass through the hole puller 5 and extend to the outside of the rotating shaft 9.

[0040] The power hole pulling mechanism relies on the rotating motor 7 as the rotating power, and at the same time needs to cooperate with the telescopic power on the left side of the slide base 3 as the power for horizontal displacement, so as to ensure that the slide base 3 and the power hole pulling mechanism are effectively displaced in position before and after hole pulling; after the installation of the hole puller 5 is completed, the locking pin 11 can keep the stable connection with the rotating shaft 9, so as to ensure the relative locking when following the rotation or displacement.

[0041] In any of the above schemes, preferably, the hole puller 5 comprises a large-diameter shaft 501 arranged horizontally, the left end of the large-diameter shaft 501 is fitted and inserted into the positioning blind hole 10, an inner pin hole 502 is arranged on the outer sidewall of the large-diameter shaft for the locking pin 11 to pass through, a stepped reducing section 503 is integrally formed at the right end of the large-diameter shaft 501, a small-diameter section 504 is integrally formed at the right end of the stepped reducing section 503, a pull hook piece is integrally formed at the right end of the small-diameter section 504, the right end of the pull hook piece extends to the hole opening 6 on the outer sidewall of the copper pipe 4 to be pulled, and the right end of the pull hook piece is larger in size than the inner diameter of the hole opening 6 on the outer sidewall of the copper pipe 4 to be pulled. As can be seen from the above, when the hole puller 5 is used for pulling, the pull hook piece at the right end of the small-diameter section 504 is used as a working piece, which can directly extend into the hole opening 6 of the copper pipe 4 to be pulled, avoiding the problem of separate combination of the conventional hole puller 5, and avoiding the complicated assembly and disassembly operations before and after pulling. The left end of the large-diameter section is connected to a power source to ensure the rapid pulling operation and improve the pulling efficiency and reliability.

[0042] In any of the above schemes, preferably, the pull hook piece comprises a protruding section 505 integrally formed at the right end of the small-diameter section 504, the left end of the protruding section 505 is smaller in outer diameter than the right end, the right end of the protruding section 505 is symmetrically arranged on both sides, a through opening slot 506 is arranged on one side of the protruding section 505, and the left end of the through opening slot 506 is open. It should be noted that when the pull hook piece is used, the opening end of the obliquely arranged through opening slot 506 is first deeply inserted into the hole opening 6 of the copper pipe 4, then it is inserted while rotating, and finally the entire pull hook piece is placed inside the lumen of the copper pipe 4 at the position of the hole opening 6.

[0043] Preferably in any of the above solutions, the workpiece positioning mechanism comprises a fixed clamping seat 12 fixedly installed on the top of the operating table 1 on the right side of the slide rail 2, a fixed semicircular opening 13 for placing the outer side wall curve of the copper pipe 4 is arranged on the right end face of the fixed clamping seat 12, a center alignment hole 14 is arranged on the fixed clamping seat 12 on the left side of the center of the fixed semicircular opening 13, the center alignment hole 14 is aligned with the center of the hole 6 to be tapped on the outer side wall of the copper pipe 4, the hole diameter of the center alignment hole 14 is larger than the maximum external size of the drawhook, a movable clamping seat 15 is arranged on the right side of the fixed clamping seat 12, the movable clamping seat 15 cooperates with the fixed clamping seat 12 to achieve clamping positioning of the outer side wall of the copper pipe 4, a bearing seat 16 is fixedly installed on the top of the operating table 1 on the right side of the movable clamping seat 15, a pressing shaft 17 is inserted and cooperated in the shaft hole of the bearing seat 16, the left end of the pressing shaft 17 is fixed in the middle of the right side wall of the movable clamping seat 15, and the right end of the pressing shaft 17 is connected with an external hydraulic cylinder and follows to realize left-right stretching.

[0044] When the workpiece positioning mechanism works, the fixed clamping seat 12 cooperates with the movable clamping seat 15 to achieve positioning of the outer side wall of the copper pipe 4, thereby ensuring the firmness of the positioning of the copper pipe 4 during tapping of the hole 6, and the slide 3 is pulled to the left by the external stretching power on the left side during tapping, and the high-speed rotation of the tapping tool 5 is maintained during the pulling process, so that the tapping tool 5 is finally pulled out to the left and the tapping of the hole 6 of the copper pipe 4 is completed.

[0045] In addition, it should be noted that the pressing shaft 17 is stretched and retracted under the stretching and retraction of the external hydraulic cylinder on the right side, and in the stretching and retraction process, the movable clamping seat 15 can be driven to approach or move away from the copper pipe 4, thereby achieving clamping or loosening of the outer side wall of the copper pipe 4.

[0046] Embodiment 3: Compared with Embodiment 2, the difference lies in that it further comprises the following technical features:

[0047] Preferably in any of the above solutions, the included angle between the center axis of the through opening groove 506 and the center axis of the small-diameter shaft is 100°-140°.

[0048] The appropriate inclination angle and internal length of the through opening groove 506 can ensure the smoothness during installation of the tapping tool 5, and ensure that the tapping tool 5 can be installed into the hole 6 by being clamped into the through opening groove 506 and swinging the drawhook.

[0049] Preferably, in any of the above solutions, the puller is made of a blank. The blank is integrally formed to effectively ensure the firmness of the puller and improve the use strength.

[0050] Preferably, in any of the above solutions, the outer side edges of the convex section 505 are provided with rounded surfaces 507. The rounded surfaces 507 ensure the smoothness of the puller and the safety of the rotation hole pulling, and avoid the sharp corners scratching the inner wall of the copper pipe 4.

[0051] Specific working principle: Before using the device, the copper pipe 4 needs to be installed, and then the hole puller 5 is installed. The specific operation is as follows: the equal-diameter hole pulling device cooperates with the hole puller 5 to provide an installation position for the hole puller 5 and a fixed position for the copper pipe 4 workpiece, thereby ensuring the whole hole pulling operation; before hole pulling, the workpiece positioning mechanism completes the positioning of the copper pipe 4 workpiece, so that the hole 6 on the outer side wall of the copper pipe 4 to be pulled is oriented towards the power hole pulling mechanism and coaxially arranged with the rotating shaft 9 of the power hole pulling mechanism, and then the hole puller 5 is installed, and the left end of the hole puller 5 is inserted into the inside of the power hole pulling mechanism and is locked by pin connection.

[0052] Then, the power hole pulling mechanism is started and kept rotating at high speed, and while keeping the rotating state, the slide 3 and the components thereon are pulled by the left external pulling device, so that the hole puller 5 in the high-speed rotating state is finally pulled to the left, and the hole is pulled quickly. Since the maximum size of the hole puller 5 is slightly larger than the inner diameter of the hole 6, and the copper pipe 4 has a certain ductility, the hole pulling operation can be smoothly performed.

[0053] In summary, the whole structure of the puller 5 is simple and integrally machined and molded, which can be directly installed on the outside wall of the red copper pipe 4 and used inside the hole 6 to be pulled, and the external rotation force and tension force are matched to realize the rotation and direction change outside the hole to quickly pull the hole, effectively improving the efficiency of the hole pulling, and the parts need to be disassembled after the hole is pulled, which greatly simplifies the operation steps compared with the traditional puller 5; the puller 5 can be matched with the change of the inclination angle to quickly place the pull hook piece at the right end of the puller 5 inside the hole 6 to be pulled and realize horizontal centering, and then the left end of the puller 5 is directly connected with the equal-diameter hole pulling equipment to start the rotation power and extension power to pull and move the hole while rotating; the puller 5 adopts the plug-in and pin connection mode to realize quick positioning when being installed and matched with the equal-diameter hole pulling equipment, effectively ensuring the firmness of the connection and improving the firmness of the whole puller 5 when following the rotation and following the pulling; the equal-diameter hole pulling equipment can rely on the workpiece positioning mechanism to complete the clamping and positioning of the red copper pipe 4 workpiece, and after positioning, the left pulling and rotation driving of the power hole pulling mechanism is relied on to realize the left pulling of the puller 5 in the rotating state, and the hole pulling operation is realized by the right end of the puller 5 which is larger than the inner diameter size of the hole 6.

[0054] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application; any alternative improvement or change made by those skilled in the art to the embodiments of the present application falls within the protection scope of the present application.

[0055] The details not described in the present application are the known technology of those skilled in the art.

Claims

1. A picker, characterized in that: The device comprises a large-diameter shaft arranged horizontally, an inner pin hole for a locking pin is arranged on the outer wall of the large-diameter shaft, a stepped reducing section is integrally formed on the right end of the large-diameter shaft, a small-diameter section is integrally formed on the right end of the stepped reducing section, and a pull hook is integrally formed on the right end of the small-diameter section.

2. A picker according to claim 1, wherein: The pull hook comprises a protruding section integrally formed on the right end of the small-diameter section, the outer diameter of the left end of the protruding section is smaller than that of the right end, the right end of the protruding section is symmetrically arranged on both sides, and a through opening slot is arranged on one side of the protruding section.

3. A constant diameter hole pulling apparatus having a hole puller as claimed in claim 2 characterised by: The device comprises a slide rail fixedly installed on the left side of the top of the operation table, a slide seat is slidingly and fitly installed on the top of the slide rail, the left side of the slide seat is connected with an externally arranged telescopic power, a power hole pulling mechanism is installed on the top of the slide seat, a workpiece positioning mechanism is fixedly installed on the right end of the power hole pulling mechanism, the workpiece positioning mechanism is used for clamping and positioning the copper pipe, the hole puller is clamped and installed on the right end working end of the power hole pulling mechanism, the right end of the hole puller is the working end and the end thereof extends into the hole to be pulled on the outer side wall of the clamped and positioned copper pipe, and the power hole pulling mechanism moves horizontally along with the slide seat under the action of the external telescopic power.

4. A constant-diameter hole drawing apparatus according to claim 3, characterized in that: The power hole pulling mechanism comprises a rotary motor fixedly installed on the top of the slide seat, a rotary disc is fixedly installed on the right end of the motor shaft of the rotary motor, a rotary shaft is coaxially and fixedly connected to the right end of the rotary disc, a positioning blind hole is arranged on the right end of the rotary shaft for inserting the left end of the hole puller, a locking pin is fitly inserted on the outer side wall of the rotary shaft at the position of the positioning blind hole, and the two ends of the locking pin extend to the outside of the rotary shaft through the hole puller.

5. A constant-diameter hole drawing apparatus according to claim 4, characterized in that: The hole puller comprises a large-diameter shaft arranged horizontally, the left end of the large-diameter shaft is fitly inserted into the positioning blind hole, an inner pin hole for the locking pin is arranged on the outer side wall of the large-diameter shaft, a stepped reducing section is integrally formed on the right end of the large-diameter shaft, a small-diameter section is integrally formed on the right end of the stepped reducing section, and a pull hook is integrally formed on the right end of the small-diameter section.

6. A constant-diameter hole pulling apparatus according to claim 5, wherein: The pull hook comprises a protruding section integrally formed on the right end of the small-diameter section, the outer diameter of the left end of the protruding section is smaller than that of the right end, the right end of the protruding section is symmetrically arranged on both sides, and a through opening slot is arranged on one side of the protruding section.

7. A constant-diameter hole drawing apparatus according to claim 6, characterized in that: The outer side edges of the protruding section are provided with rounded surfaces.

8. A constant-diameter hole pulling apparatus according to claim 7, wherein: The workpiece positioning mechanism comprises a fixed clamping seat fixedly installed on the top of the operating table on the right side of the slide rail, a fixed semicircular opening for placing the outer side wall curve of the red copper pipe is arranged on the right end surface of the fixed clamping seat, a center alignment hole penetratingly arranged is formed in the fixed clamping seat on the left side of the center of the fixed semicircular opening, the center alignment hole is aligned with the center of the hole of the red copper pipe to be tapped, the hole diameter of the center alignment hole is larger than the maximum external size of the drawhook, a movable clamping seat is arranged on the right side of the fixed clamping seat, the movable clamping seat is matched with the fixed clamping seat to clamp and position the outer side wall of the red copper pipe, a bearing seat is fixedly installed on the top of the operating table on the right side of the movable clamping seat, a pressing shaft is matched and installed in the shaft hole of the bearing seat, the left end of the pressing shaft is fixedly installed in the middle part of the right side wall of the movable clamping seat, and the right end of the pressing shaft is connected with an external hydraulic cylinder and follows to realize left-right stretching and contraction.

9. A constant-diameter hole drawing apparatus according to claim 8, characterized in that: The included angle between the center axis of the through opening groove and the center axis of the small-diameter section is 100-140 degrees.

10. A constant-diameter hole drawing apparatus according to claim 9, characterized in that: The drawhook is made of a blank.

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