Hole expansion device for pipe orifice of copper pipe

Abstract

The utility model relates to the technical field of copper pipe hole expansion, in particular to a copper pipe orifice hole expansion device which comprises a workbench, a shifting mechanism is installed on the right side of the top of the workbench, a hole expansion power unit is installed at the left end of the shifting mechanism, and a hole expander is detachably installed at the left end of the hole expansion power unit. The hole expanding power unit is fixedly connected with the shifting mechanism through a sliding follower, and the bottom of the sliding follower movably abuts against the top of a smooth platform. According to the copper pipe orifice expanding device designed in the utility model, telescopic translation and radial hole expanding and expanding operation can be completed on the hole expander at the left end by virtue of the shifting mechanism and the hole expanding power unit, so that pipe orifice expanding of a red copper pipe sleeved on the outer side wall of the hole expander can be rapidly completed, the pipe orifice of the red copper pipe is effectively expanded, and the production efficiency of the copper pipe is improved. The whole hole expanding operation depends on external hydraulic pressure to provide power for the hole expanding power unit, and the hole expanding efficiency is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of copper tube expansion technology, and in particular to a copper tube end expansion device. Background Technology

[0002] Copper pipes have excellent thermal conductivity, good flexibility and high strength, so they are usually used as pipes in the refrigeration system of air conditioning systems.

[0003] When installing copper pipes, it is generally necessary to connect copper pipes of different diameters. In order to meet the needs of connecting other components and adapt to the connection of pipes of different diameters, it is usually necessary to expand the holes at the ends of the copper pipes. When expanding the holes of copper pipes, a manual expansion tool is generally used to expand the holes at the ends of the copper pipes.

[0004] A search revealed a copper tube shaping connector disclosed in patent application CN201720346339.6. Its main structure includes a locking rod and an expansion sleeve. The locking rod has a square center, with screws on both sides. The outer end of each screw has an outer tapered rod. The expansion sleeve has an inner tapered hole with an internal thread on the outer side of the larger end. Several buffer holes are evenly distributed near the smaller end of the inner tapered hole. The buffer holes communicate with an elastic groove, and the other end of the elastic groove is open to the other end face of the expansion sleeve. The expansion sleeve is connected to the locking rod, and the internal thread is screwed to the screw. The outer diameter of the expansion sleeve matches the inner diameter of the copper tube.

[0005] As can be seen from the above-mentioned copper tube shaping connector, it mainly adjusts the hole diameter by pressing the outer conical rods and expansion sleeves at both ends into the end holes of the copper tubes at the corresponding ends. It is actually a hole-expanding method. Although this hole-expanding structure is relatively simple, it has the following problems in actual use:

[0006] When performing the hole expansion operation, the copper tube is expanded by manually tightening and then relying on the outer cone rod and expansion sleeve. During the operation, manual circumferential pushing force is required to drive the conical curved surface to expand the hole. The operation is difficult and requires additional external force to achieve the expansion.

[0007] When the above-mentioned shaping connector is used as a butt joint, it also achieves hole expansion shaping. However, this hole expansion method is not suitable for the hole expansion operation of the end tube holes of a batch of copper tubes.

[0008] Based on this, this utility model proposes a novel semi-automatic mechanical expansion structure that can quickly expand the end of a copper tube, in order to better solve the problems existing in the prior art. Utility Model Content

[0009] To solve one of the aforementioned technical problems, the present invention provides a copper tube end-expansion device, comprising a worktable, a shifting mechanism mounted on the top right side of the worktable, an expansion power unit mounted on the left end of the shifting mechanism, and an expansion device detachably mounted on the left end of the expansion power unit. The expansion device, in its working state, is used to insert into the end of the copper tube to be expanded. The expansion power unit and the shifting mechanism are fixedly connected via a sliding follower. The bottom of the sliding follower movably abuts against the top of a smooth platform, and the bottom of the smooth platform is fixed to the top of the worktable.

[0010] In any of the above embodiments, it is preferred that the expansion power unit includes a horizontally arranged double-acting telescopic cylinder, the right end of the cylinder of the double-acting telescopic cylinder is fixed to the left end face of the sliding follower on its right side, and the left end of the cylinder of the double-acting telescopic cylinder is screwed and fixedly connected to the right end of the expansion device.

[0011] In any of the above embodiments, preferably, the expansion device includes a secondary cylinder coaxially arranged with the piston rod of the double-acting telescopic cylinder. The outer wall of the right end of the secondary cylinder has an external thread, and a sealing end cap is threadedly engaged at the left end of the secondary cylinder. The right end of the secondary cylinder is threadedly and sealed within the threaded hole of the left end cap of the double-acting telescopic cylinder. A plunger cavity is provided inside the secondary cylinder, and the plunger cavity communicates with the piston cavity inside the double-acting telescopic cylinder. The left end of the piston rod of the double-acting telescopic cylinder is sealed and inserted into the plunger cavity of the secondary cylinder. Several sets of radial tensioning components are arranged in a circumferential array on the outer wall of the middle portion of the secondary cylinder. Each radial tensioning component moves synchronously during radial expansion and contraction, and the outer end of each radial tensioning component abuts against the inner wall of the copper tube to be expanded.

[0012] In any of the above embodiments, it is preferred that the radial tensioning component includes two small-diameter radial tubes spaced apart and integrally formed and fixed on the outer side wall of the auxiliary cylinder. The expansion holes of the two small-diameter radial tubes are connected to the plunger cavity of the auxiliary cylinder. Radial pressure columns are sealed and plugged in the expansion holes of each of the small-diameter radial tubes. The outer end of each radial pressure column is fixed on the inner side wall of an arc-shaped expansion plate.

[0013] In any of the above embodiments, it is preferred that a return spring is sleeved on the outer wall of the radial pressing column between the arc-shaped expansion plate and the corresponding small-diameter radial tube, the outer end of each return spring is fixed on the inner wall of the arc-shaped expansion plate, and the inner end of each return spring is fixed on the small-diameter radial tube.

[0014] In any of the above embodiments, it is preferred that chamfered curved surfaces are provided at both ends of each of the arc-shaped expansion plates.

[0015] In any of the above schemes, it is preferred that the distance between the adjacent end faces of two adjacent arc-shaped expansion plates is 2mm-3mm when they are idle.

[0016] In any of the above embodiments, it is preferred that the sliding follower includes a sliding frame that is horizontally abutted against the top of the smooth platform, the left end of the sliding frame is fixedly connected to the right end of the cylinder of the double-acting telescopic cylinder, and the right end of the sliding frame is bolted and fixedly connected to the left end of the expansion hole power unit.

[0017] In any of the above embodiments, it is preferred that the displacement mechanism includes a U-shaped mounting frame fixedly installed on the top of the workbench, and a horizontal pushing cylinder is fixedly installed inside the U-shaped mounting frame, with the left end of the telescopic end of the horizontal pushing cylinder bolted to the right end of the sliding frame.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The copper tube end expansion device designed in this utility model can realize the telescopic translation and radial expansion of the left end expansion device by means of the displacement mechanism and expansion power unit, so as to quickly complete the expansion of the copper tube end sleeved on the outer wall of the expansion device, effectively expanding the copper tube end. The entire expansion operation relies on external hydraulic power to provide power to the expansion power unit, effectively improving the expansion efficiency.

[0020] 2. When the expansion power unit in this utility model provides radial pushing force to the expansion device, it can simultaneously push multiple radially pressing columns distributed in an array outward, effectively ensuring that the multiple radially pressing columns, together with the arc-shaped expansion plate at their outer ends, quickly expand outward and cooperate to expand the inner radially outward of the opening of the thin-walled copper tube, effectively ensuring the expansion hole forming effect.

[0021] 3. In this utility model, after the power provided to the expansion device disappears, it can quickly return to its original position under the action of each return spring. Then, under the extension and retraction action of the shifting mechanism, it can drive the current expansion device and expansion power unit to return to their original position, ensuring rapid separation from the copper tube workpiece and improving operating efficiency. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a structural schematic diagram of the copper tube of this utility model in its installation cross-sectional view.

[0025] Figure 3 This is a schematic diagram of the expansion device of this utility model.

[0026] Figure 4 This is a schematic diagram of the end face structure of this utility model.

[0027] Figure 5 This is a partial three-dimensional structural diagram of the expansion device of this utility model.

[0028] Figure 6 This is a schematic diagram of the internal cross-sectional structure of the expansion device of this utility model in its end face state.

[0029] In the diagram, 1. Workbench; 2. Expander; 201. Secondary cylinder; 202. Sealing end cap; 203. Left end cap; 204. Piston cavity; 205. Small-diameter radial tube; 206. Expander cavity; 207. Radial pressure column; 208. Arc-shaped expander plate; 209. Return spring; 210. Chamfered surface; 3. Copper tube; 4. Smooth platform; 5. Double-acting telescopic cylinder; 501. Cylinder; 502. Piston rod; 6. Sliding frame; 7. U-shaped mounting bracket; 8. Horizontal pusher cylinder. Detailed Implementation

[0030] The embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of the present utility model, and are therefore merely examples and should not be construed as limiting the scope of protection of the present utility model. The specific structure of the present utility model is as follows: Figures 1-6 As shown in the image.

[0031] Example 1: A copper tube end expansion device includes a workbench 1, a shifting mechanism is installed on the top right side of the workbench 1, an expansion power unit is installed on the left end of the shifting mechanism, and an expansion device 2 is detachably installed on the left end of the expansion power unit. The expansion device 2 is used to insert into the end of the copper tube 3 to be expanded in the working state. The expansion power unit and the shifting mechanism are fixedly connected by a sliding follower. The bottom of the sliding follower movably abuts against the top of a smooth platform 4. The bottom of the smooth platform 4 is fixed to the top of the workbench 1.

[0032] Before using the entire device, the initial position should be adjusted. After the initial position is adjusted, the expansion hole power unit should be connected to the external hydraulic station.

[0033] In addition, during the initial position adjustment, the telescoping mechanism can drive the sliding follower, expansion power unit, and expansion device 2 on the left side to move to the appropriate position. After the position is reached, the operator holds the copper tube 3 and places its end on the outer wall of the expansion device 2 while controlling the insertion depth to the right. When the appropriate depth is reached, the operator holds the copper tube 3 and quickly controls the expansion power unit to provide sufficient power under the action of the external hydraulic station. The expansion power unit pushes the oil to the expansion device 2. By controlling the oil pressure and the oil supply time, the expansion device 2 can be pushed outward appropriately, thereby achieving expansion as needed. During the outward expansion process, the inner diameter of the copper tube 3 will expand under the action of various radial thrusts.

[0034] After the expansion is completed, control the expansion power unit to return the oil. After the oil returns, control the expansion device 2 to retract back to its original position. Control the shifting mechanism to move back to achieve the reset of the entire device.

[0035] In any of the above embodiments, it is preferred that the expansion power unit includes a horizontally arranged double-acting telescopic cylinder 5, the right end of the cylinder barrel 501 of the double-acting telescopic cylinder 5 is fixed to the left end face of the sliding follower on its right side, and the left end of the cylinder barrel 501 of the double-acting telescopic cylinder 5 is screwed and fixedly connected to the right end of the expansion device 2.

[0036] The inlet and outlet ports on the double-acting telescopic cylinder 5 are connected to an external hydraulic station. By controlling the oil supply and return of the external hydraulic station, the extension and retraction of the piston rod 502 of the double-acting telescopic cylinder 5 are controlled, as well as the pushing pressure. When the double-acting telescopic cylinder 5 supplies oil, it can drive the left end of the piston rod 502 to move to the left, thereby driving the piston rod 502 to continue to extend to the left into the secondary cylinder 201 of the expansion chamber 2 and pressurize the plunger cavity 204 inside the secondary cylinder 201. After pressurization, the compression of the internal air can control the radial tensioning components to extend and retract synchronously in the radial direction, ultimately achieving the purpose of quickly expanding the opening of the copper tube 3 sleeved on the outside of the expansion chamber 2.

[0037] In any of the above embodiments, preferably, the expansion device 2 includes a secondary cylinder 201 coaxially arranged with the piston rod 502 of the double-acting telescopic cylinder 5. The outer wall of the right end of the secondary cylinder 201 is provided with external threads. A sealing end cap 202 is threadedly engaged with the left end of the secondary cylinder 201. The right end of the secondary cylinder 201 is threadedly sealed within the threaded hole of the left end cap 203 of the double-acting telescopic cylinder 5. A plunger cavity 204 is provided inside the secondary cylinder 201. The plunger cavity 204 is connected to the piston cavity inside the double-acting telescopic cylinder 5. The left end of the piston rod 502 of the double-acting telescopic cylinder 5 is sealed and inserted into the plunger cavity 204 of the auxiliary cylinder 201. Several sets of radial tensioning components are arranged in a circumferential array on the outer wall of the middle part of the auxiliary cylinder 201. Each radial tensioning component is in a synchronous motion state when it is radially extended and retracted. The outer end of each radial tensioning component abuts against the inner wall of the copper tube 3 to be expanded.

[0038] Before the expansion device 2 is put into operation, the external thread at the end of the auxiliary cylinder 201 is used to fix its entire structure on the left end cap 203 of the double-acting telescopic cylinder 5 and keep it in relative position. When it is necessary to control the radial tensioning components to expand the hole of the copper tube 3 synchronously in the radial direction, the piston rod 502 of the double-acting telescopic cylinder 5 extends outward, which allows the piston rod 502 to push the air inside the plunger cavity 204 to the left and push the air to the inner end of each radial tensioning component. At the same time, it pushes multiple radial tensioning components to move outward, thereby achieving the purpose of rapid hole expansion.

[0039] In any of the above embodiments, it is preferred that the radial tensioning component includes two small-diameter radial tubes 205 spaced apart and integrally formed and fixed on the outer side wall of the auxiliary cylinder 201. The expansion holes 206 of the two small-diameter radial tubes 205 are connected to the plunger cavity 204 of the auxiliary cylinder 201. Radial pressure columns 207 are respectively sealed and plugged in the expansion holes 206 of each small-diameter radial tube 205. The outer end of each radial pressure column 207 is fixed on the inner side wall of an arc-shaped expansion plate 208.

[0040] When the radial tensioning component is working, it relies on the expansion cavity 206 of each small-diameter radial tube 205 to receive high-pressure air. Under the action of air pressure, the radial pressure column 207 will be pushed outward, thereby causing the outer end of each radial pressure column 207 to push the arc-shaped expansion plate 208 outward. Since the outer arc-shaped surface of the arc-shaped expansion plate 208 abuts against the inner wall of the cavity of the copper tube 3 currently sleeved on the outside, the expansion operation of the tube opening of the copper tube 3 can be completed when the multiple arc-shaped expansion plates 208 expand and push outward with pressure.

[0041] In any of the above embodiments, it is preferred that the sliding follower includes a sliding frame 6 that is horizontally abutted against the top of the smooth platform 4, the left end of the sliding frame 6 is fixedly connected to the right end of the cylinder 501 of the double-acting telescopic cylinder 5, and the right end of the sliding frame 6 is bolted and fixedly connected to the left end of the expansion hole power unit.

[0042] The sliding follower in this invention can effectively ensure the stable support of the bottom of the sliding frame 6 when it is shifted, and at the same time, it can pull the expansion hole power unit to move left and right during the shifting process.

[0043] In any of the above embodiments, it is preferred that the displacement mechanism includes a U-shaped mounting frame 7 fixedly installed on the top of the workbench 1, and a horizontal pushing cylinder 8 is fixedly installed in the U-shaped mounting frame 7. The left end of the telescopic end of the horizontal pushing cylinder 8 is bolted to the right end of the sliding frame 6.

[0044] When the horizontal push cylinder 8 extends or retracts, it can drive the connected components on its left end to move accordingly, thereby effectively controlling the expansion device 2 to move into place as needed.

[0045] Example 2: Compared with Example 1, this example differs in that it also includes the following technical features:

[0046] In any of the above embodiments, it is preferred that a return spring 209 is sleeved on the outer wall of the radial pressing column 207 between the arc-shaped expansion plate 208 and the corresponding small-diameter radial tube 205. The outer ends of each return spring 209 are fixed on the inner wall of the arc-shaped expansion plate 208, and the inner ends of each return spring 209 are fixed on the small-diameter radial tube 205.

[0047] The return springs 209 installed here can drive the corresponding arc-shaped expansion plate 208 to return inward during operation.

[0048] In any of the above embodiments, it is preferred that chamfered curved surfaces 210 are provided at both ends of each of the arc-shaped expansion plates 208. The chamfered curved surfaces 210 can effectively play a protective transition role, preventing scratches on the inner wall of the copper tube 3 when expanding the hole outward.

[0049] In any of the above solutions, it is preferred that the distance between the adjacent end faces of two adjacent arc-shaped expansion plates 208 is 2mm-3mm when they are idle. Setting a reasonable gap can ensure that no interference occurs when they are stored.

[0050] Specific working principle: Before use, the copper tube end expansion device of this utility model is initially adjusted. After the initial position is adjusted, the expansion power unit is connected to the external hydraulic station. Specifically, during the initial position adjustment, the extension and retraction of the shifting mechanism can drive the sliding follower, expansion power unit, and expansion device 2 on its left side to move to the appropriate position. After moving to the correct position, the operator holds the copper tube 3 and fits its end end onto the outer wall of the expansion device 2, while controlling the insertion depth to the right. When the appropriate depth is reached, the operator holds the copper tube 3 and quickly controls the expansion power unit to provide sufficient power under the action of the external hydraulic station. The expansion power unit pushes the oil to the expansion device 2. By controlling the oil pressure and the oil supply time, the expansion device 2 can be pushed outward appropriately, thereby achieving expansion as needed. During the outward expansion process, the inner diameter of the copper tube 3 will be expanded under the action of various radial thrusts. This process is repeated to expand the inner diameter of multiple copper tubes 3.

[0051] In summary, the copper tube end expansion device of this invention can achieve telescopic translation and radial expansion of the left end expansion device 2 by relying on the shifting mechanism and the expansion power unit. This allows for rapid expansion of the copper tube end 3 fitted onto the outer wall of the expansion device 2, effectively expanding the end of the copper tube 3. The entire expansion operation relies on external hydraulic pressure to power the expansion power unit, effectively improving expansion efficiency. When the expansion power unit provides radial pushing force to the expansion device 2, it can simultaneously achieve expansion of the array... Multiple radial pressure columns 207 are pushed outward, effectively ensuring that the multiple radial pressure columns 207, together with the arc-shaped expansion plate 208 at their outer ends, quickly open outward and cooperate to expand the inner radially outward of the opening of the thin-walled copper tube 3, effectively ensuring the expansion hole forming effect; after the power provided to the expansion device 2 disappears, it can quickly return to its original position under the action of each return spring 209, and then under the extension and retraction action of the shifting mechanism, it can actuate the current expansion device 2 and expansion power unit to return to their original position, ensuring rapid separation from the copper tube 3 workpiece and improving operating efficiency.

[0052] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. For those skilled in the art, any alternative improvements or transformations made to the implementation of this utility model fall within the protection scope of this utility model.

[0053] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A device for expanding the mouth of a copper tube, comprising a worktable, characterised in that: A displacement mechanism is installed on the right side of the top of the workbench, a hole expanding power unit is installed on the left end of the displacement mechanism, and a hole expander is detachably installed on the left end of the hole expanding power unit. The hole expander is used to be inserted into the pipe opening of the copper pipe to be expanded in the working state. The hole expanding power unit is fixedly connected with the displacement mechanism through a sliding follower. The bottom of the sliding follower is movably abutted on the top of a smooth platform, and the bottom of the smooth platform is fixed on the top of the workbench. The hole expanding power unit comprises a double-acting telescopic cylinder arranged horizontally. The right end of the cylinder barrel of the double-acting telescopic cylinder is fixed on the left end face of the sliding follower on the right side. The left end of the cylinder barrel of the double-acting telescopic cylinder is screwingly and fixedly connected with the right end of the hole expander. The hole expander comprises a sub-cylinder coaxially arranged with the piston rod of the double-acting telescopic cylinder. An external thread is arranged on the right end outer side wall of the sub-cylinder. A blind end cover is screwingly threaded on the left end of the sub-cylinder. The right end of the sub-cylinder is screwingly and sealingly threaded in the threaded hole of the left end cover of the double-acting telescopic cylinder. A plunger cavity is arranged in the sub-cylinder. The plunger cavity is in communication with the piston cavity in the double-acting telescopic cylinder. The left end of the piston rod of the double-acting telescopic cylinder is sealingly inserted into the plunger cavity of the sub-cylinder. A plurality of groups of radial expansion components are arranged on the middle outer side wall of the sub-cylinder along the circumference thereof. The radial expansion components are in synchronous motion state when they are expanded in the radial direction. The outer ends of the radial expansion components are abutted on the inner wall of the pipe opening of the copper pipe to be expanded.

2. A device for expanding the end of a copper tube according to claim 1, wherein: The radial expansion component comprises two small-diameter radial pipes which are spaced apart and integrally formed on the outer side wall of the sub-cylinder. The expansion pipe cavities of the two small-diameter radial pipes are in communication with the plunger cavity of the sub-cylinder. Radial pressing columns are sealingly and respectively arranged in the expansion pipe cavities of the small-diameter radial pipes. The outer ends of the radial pressing columns are fixed on the inner side wall of an arc-shaped hole expanding plate.

3. A device for expanding the mouth of a copper tube according to claim 2, wherein: A return spring is sleeved on the outer side wall of the radial pressing column between the arc-shaped hole expanding plate and the corresponding small-diameter radial pipe. The outer ends of the return springs are respectively fixed on the inner side wall of the arc-shaped hole expanding plate. The inner ends of the return springs are fixed on the small-diameter radial pipe.

4. A device for expanding the mouth of a copper tube according to claim 3, characterized in that: A chamfered curved surface is arranged at the two ends of each arc-shaped hole expanding plate.

5. A device for expanding the mouth of a copper tube according to claim 4, wherein: The spacing distance between the adjacent end faces of the two adjacent arc-shaped hole expanding plates in the idle state is 2mm-3mm.

6. A device for expanding the mouth of a copper tube according to claim 5, wherein: The sliding follower comprises a sliding frame which is horizontally abutted on the top of the smooth platform. The left end of the sliding frame is fixedly connected with the right end of the cylinder barrel of the double-acting telescopic cylinder. The right end of the sliding frame is boltedly and fixedly connected with the left end of the hole expanding power unit.

7. A device for expanding the mouth of a copper tube according to claim 6, wherein: The displacement mechanism comprises a U-shaped mounting bracket which is fixedly installed on the top of the workbench. A horizontal pushing cylinder is fixedly installed in the U-shaped mounting bracket. The left end of the telescopic end of the horizontal pushing cylinder is boltedly and fixedly connected with the right end of the sliding frame.

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