JP2011218372A - Hydraulically-driven tube expanding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulically-driven tube expanding apparatus which can improve work efficiency of tube expanding process.SOLUTION: The tube expanding apparatus 10 has a holding frame 6 which can hold a piping, a tube expanding punch 12, a first oil feed pipe 2 that feeds oil from a hydraulic pump 22 to a first hydraulic cylinder 4, and a second oil feed pipe 16 that feeds oil from the hydraulic pump 22 to a second hydraulic cylinder 14. The first hydraulic cylinder 4 can fix the piping held by the holding frame 6 by tightening the piping with hydraulic pressure. The second hydraulic cylinder 14 can insert the tube expanding punch 12 into an opening end of the piping by hydraulic pressure. Pipe diameters and lengths of the first oil feed pipe 2 and the second oil feed pipe 16 are adjusted to feed oil to the first hydraulic cylinder 4 and the second hydraulic cylinder 14 so that when the hydraulic pump 22 is driven, the piping is fixed to the holding frame 6 before the tube expanding punch 12 is inserted inside an opening end of the piping.

Description

  The present invention relates to a hydraulically driven pipe expanding device.

  2. Description of the Related Art Conventionally, a pipe expanding apparatus described in Patent Document 1 is known as a hydraulically driven pipe expanding apparatus. The pipe expansion device includes a hydraulic pump, a hydraulic cylinder connected to the hydraulic pump, a pipe expansion punch connected to the hydraulic cylinder, a clamp that can hold the pipe, and a pipe that can hold the clamp and fix the pipe. And a holding frame. In this pipe expanding device, the hydraulic cylinder is driven by the hydraulic pressure of the oil fed from the hydraulic pump, and the pipe expanding punch is inserted into the open end of the pipe fixed to the holding frame. According to this pipe expanding device, the pipe can be inserted into the opening end of the pipe fixed to the holding frame by manually fixing the pipe to the holding frame in advance and driving the hydraulic pump in this state. Thereby, the opening end of piping can be plastically deformed and tube expansion processing can be performed.

JP 2004-243368 A

  In the hydraulic drive type pipe expansion device, it is desirable to control the operation of fixing the pipe to the holding frame by hydraulic pressure from the viewpoint of work efficiency. Here, when the pipe expansion process is started, the pipe to be processed needs to be fixed in advance. For this reason, if the operation for inserting the pipe expansion punch into the open end of the pipe and the operation for fixing the pipe to the holding frame are controlled using two hydraulic pumps, the cost increases as the number of hydraulic pumps increases. It is necessary to adjust the timing for driving each of the two hydraulic pumps when pipe expansion is performed.

  In addition, if the pipe expansion punch insertion work and the pipe fixing work are controlled using a single hydraulic pump, the pipe expansion work is performed so that the pipe fixing work is performed prior to the pipe expansion punch insertion work. It is necessary to adjust the oil feed pipe etc. every time. Alternatively, it is necessary to provide special equipment such as a switching valve for the oil feed pipe. For this reason, there exists a possibility that the increase in manufacturing cost etc. may arise.

  The present invention has been created in view of the above problems. An object of the present invention is to provide a hydraulically driven pipe expanding device capable of improving the work efficiency of the pipe expanding process while suppressing the manufacturing cost.

  The technology disclosed in the present specification is a pipe expansion device that expands a pipe by plastically deforming an opening end of a pipe, and is sandwiched between the hydraulic pump, a clamping section that can clamp the outer periphery of the pipe, and the clamping section. A large-diameter portion having a diameter larger than the inner diameter of the pipe, and an expansion portion having a distal end side from the large-diameter portion and insertable into an opening end of the pipe, the hydraulic pump, and the A first oil feed pipe for connecting oil from the hydraulic pump to the sandwiching part and a hydraulic pump and the pipe expansion part are connected to the clamping part, and oil from the hydraulic pump is piped to the pipe. A second oil feeding pipe that feeds oil to the part, and the clamping part presses the outer periphery of the pipe that is clamped by the clamping part by the oil pressure of oil fed from the hydraulic pump in a direction to further clamp the pipe. The pipe can be tightened and fixed. The expanded pipe portion can be inserted into the open end of the pipe sandwiched by the sandwiched portion by the hydraulic pressure of oil fed from the hydraulic pump, and the open end can be plastically deformed. Yes, when the hydraulic pump is driven, the pipe is fixed to the clamping part and the pipe expansion part so that the pipe is fixed by the clamping part before the pipe expansion part is inserted into the opening end of the pipe. The present invention relates to a hydraulically driven pipe expanding device in which the diameters and lengths of the first oil feeding pipe and the second oil feeding pipe are adjusted to feed oil.

  According to the above-mentioned pipe expanding device, when the hydraulic pump is driven by holding the pipe in the holding part, the pipe is fastened and fixed first in the holding part by the hydraulic pressure, and then the pipe expanding part is inserted into the opening end of the pipe by the hydraulic pressure. Then, the pipe is expanded. For this reason, it is not necessary to adjust the oil feed pipe or the like every time the pipe expansion process is performed, and the pipe expansion process can be performed only by driving the hydraulic pump once, and the work efficiency of the pipe expansion process can be improved. In addition, since the transmission order of hydraulic pressure is designed according to the pipe diameter and length between transmissions, special equipment (hydraulic valves, etc.) is not required and low cost can be realized. Become.

The ratio of the diameter of the first oil supply pipe to the second oil supply pipe is such that the tube diameter of the second oil supply pipe is in the range of 1 to 2 when the diameter of the first oil supply pipe is 4. And when the ratio of the length of the said 1st oil feeding pipe and the length of the said 2nd oil feeding pipe makes the length of the said 1st oil feeding pipe 1, the length of the said 2nd oil feeding pipe is in the range of 7-9. There may be.
According to this configuration, when the hydraulic pump is driven, the first oil feed pipe and the second feed oil to be sent to the sandwiching section before the expanded section are supplied to the oil fed to the sandwiching section and the expanded pipe section, respectively. A specific configuration of the oil pipe can be realized. Moreover, after piping is fixed, it can design so that a pipe expansion process may be started at a predetermined timing.

The clamping unit includes a clamp, a first hydraulic cylinder, and a holding frame, and the clamp is capable of mounting the pipe and can clamp an outer periphery of the mounted pipe, The first hydraulic cylinder is interposed between the first oil feeding pipe and the holding frame, and transmits oil pressure of oil fed from the hydraulic pump to the holding frame, and the holding frame houses the clamp. The clamp that is accommodated is pressed in the direction of tightening the pipe clamped by the clamp by the hydraulic pressure transmitted from the first hydraulic cylinder, and the pressing pressure is In the case where the expanded pipe portion is inserted into the open end of the pipe, the pressure may be equal to the pressure required for the expanded pipe portion to be inserted into the open end.
According to this configuration, it is possible to realize a specific configuration of the clamping unit that can clamp the outer periphery of the pipe and can clamp and fix the outer periphery of the pipe clamped by the hydraulic pressure.

The clamp is composed of a pair of clamping pieces pivotally supported so as to be pivotable with respect to each other, and the pair of clamping pieces can be brought into contact with each other by rotating, and have an annular opening in contact with each other. The pair of notches are formed, and the pipe is brought into contact with at least one of the holding pieces in a state where the pair of holding pieces are not in contact with each other. The holding pieces may turn and abut against each other, and the pipe may be held in the opening.
According to this configuration, the pipe can be automatically clamped by the clamp only by contacting the pipe with the clamping piece of the clamp, without using manual operation.

The holding frame may be separate from the clamp, and may be capable of accommodating clamps having different diameters of the openings.
According to this structure, the clamp accommodated in the holding frame can be replaced with another clamp having a different opening diameter. For this reason, the pipe expansion device can be adapted to pipes having various diameters.

The pipe expansion section includes a second hydraulic cylinder, a pipe expansion punch having the large diameter section and the insertion section, and the second hydraulic cylinder is connected to the second oil supply pipe and the pipe expansion punch. The hydraulic pressure of oil injected from the hydraulic pump is transmitted to the pipe expansion punch, and the pipe expansion punch is tubular, and the opening of the pipe that is clamped in the clamping portion by the hydraulic pressure transmitted from the second hydraulic cylinder It may be inserted at the end.
Thereby, the specific structure of the insertion part which can be inserted in the opening end of piping clamped by the clamping part with oil_pressure | hydraulic is realizable.

The tube-expansion punch may have a tapered portion that is inclined toward the inside of the diameter of the tube-expansion punch at the distal end of the insertion portion.
According to this configuration, the tip of the pipe expansion punch when the pipe expansion punch is inserted into the opening end of the pipe can be prevented from contacting the inside of the pipe. For this reason, when the tube expansion punch inserted in the opening end is pulled out from the opening end, the tube expanding punch can be easily pulled out from the opening end.

The second hydraulic cylinder may be separate from the tube expansion punch and may be mounted with a tube expansion punch having a different diameter of the insertion portion.
According to this configuration, the clamp connected to the second hydraulic cylinder can be replaced with another pipe expansion punch having a different diameter. For this reason, the diameter of the site | part expanded in a pipe expansion apparatus can be made respondable to various diameters.

A housing case for housing the clamping portion and the tube expansion portion; a support base for supporting the housing case and detachable from the housing case; and the hydraulic pump is portable, and the hydraulic pump May be attached to the support base.
According to this configuration, the sandwiching portion and the insertion portion can be accommodated in the accommodation case, and when the tube expansion device is used, the accommodation case can be attached to the support base, and the portable hydraulic pump can be attached to the support base. For this reason, the tube expansion device can be easily transported.

The pipe may be a copper pipe used for circulating a heat medium for air conditioning equipment.
In a pipe for circulating a heat medium for air conditioning equipment, since the heat medium is sealed, pipe expansion work that requires an annealing process in which soot or the like is accumulated in the pipe is not preferable. Since the pipe expansion apparatus can expand the pipe without the need for an annealing process, it can be suitably used as an apparatus for expanding the heat medium pipe for an air conditioner.

  According to the technology disclosed in this specification, it is not necessary to adjust an oil feed pipe or the like every time pipe expansion processing is performed, and it is possible to provide a hydraulically driven pipe expansion device that can improve the work efficiency of pipe expansion processing. it can.

The schematic showing the whole pipe expansion apparatus 10 is shown. The top view of the storage case 8 is shown. The top view which expanded the 1st oil feeding pipe 2 and the 2nd oil feeding pipe 16 is shown. The top view of the 2nd storage chamber 8b before a pipe expansion process is shown. The top view of the 2nd storage chamber 8b at the time of pipe expansion processing is shown. The front view of the clamp 36 before clamping the piping 34 is shown. The front view of the clamp 36 after pinching the piping 34 is shown.

  Embodiments will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating the entire tube expansion device 10 according to the embodiment. As shown in FIG. 1, the pipe expansion device 10 includes a housing case 8, a tripod 20, a table 24, an oil feeding hose 18, and a hydraulic pump 22.

  The accommodation case 8 is a case in which each member for performing pipe expansion processing is accommodated, and is supported by a tripod 20. The tripod 20 can be easily attached to and detached from the housing case 8. A table 24 supported at three points by three support shafts 26 attached to each leg of the tripod 20 is disposed below the housing case 8. One end of the oil feeding hose 18 is connected to the oil feeding branch pipe 32 housed in the housing case 8, and the other end is connected to the hydraulic pump 22. The hydraulic pump 22 is mounted on the table 24 and can feed oil to the oil feeding hose 18 by driving. A caster 21 is attached to the back side of each foot of the tripod 20. For this reason, the pipe expansion apparatus 10 becomes a structure which can be conveyed easily.

  FIG. 2 shows a plan view of the housing case 8. As shown in FIG. 2, a first storage chamber 8 a, a second storage chamber 8 b, and a third storage chamber 8 c are formed in the storage case 8. The oil supply branch pipe 32, the first oil supply pipe 2, the first hydraulic cylinder 4, and a part of the second oil supply pipe 16 are accommodated in the first storage chamber 8a. The holding frame 6, the tube expansion punch 12, the movable wall 13, and a pair of support springs 15 and 15 are accommodated in the second storage chamber 8b. A plurality of replacement clamps 28 and a plurality of replacement tube expansion punches 30 are stored in the third storage chamber 8c. Further, a part of the second oil feeding pipe 16 and the second hydraulic cylinder 14 connected to the second oil feeding pipe 16 extend outside the second storage chamber 8b.

  First, the member accommodated in the 1st accommodating chamber 8a is demonstrated. The oil feeding branch pipe 32 connects the oil feeding hose 18 (see FIG. 1), the first oil feeding pipe 2 and the second oil feeding pipe 16 respectively, and the oil fed through the oil feeding hose 18 is the first. This is for branching into a first oil feed pipe 2 and a second oil feed pipe 16. One end of the first oil feeding pipe 2 is connected to the oil feeding branch pipe 32, and the other end is connected to the first hydraulic cylinder 4. The oil branched to the first oil feed pipe 2 side by the oil feed branch pipe 32 passes through the first oil feed pipe 2 and is sent to the first hydraulic cylinder 4. One end of the second oil feeding pipe 16 is connected to the oil feeding branch pipe 32, and the other end extends to the outside of the first storage chamber 8 a and is connected to the second hydraulic cylinder 14. The oil branched to the second oil feeding pipe 16 side by the oil feeding branch pipe 32 passes through the second oil feeding pipe 16 and is sent to the second hydraulic cylinder 14. The first oil feeding pipe 2 and the second oil feeding pipe 16 will be described in detail later.

  Next, members housed in the second housing chamber 8b will be described. The holding frame 6 is a member for holding and fixing a copper pipe 34 (see FIG. 4 and the like to be described later) used for circulating a heat medium for air conditioning equipment. Specifically, the holding frame 6 is provided with an accommodation space 6a that opens upward, so that a clamp 36 (see FIG. 4 to be described later) sandwiching the pipe 34 can be accommodated in the accommodation space 6a. ing. The first hydraulic cylinder 4 includes therein a first piston (not shown) that is driven by the oil fed from the first oil feeding pipe 16. The first piston is configured to be driven by the oil pressure of the oil from the hydraulic pump 22. The first piston can transmit the hydraulic pressure to the holding frame 6. When hydraulic pressure is transmitted to the holding frame 6 by driving the first piston in a state where the clamp 36 holding the pipe 34 is accommodated in the holding frame 6, the pipe 34 held by the clamp 36 is tightened by the hydraulic pressure. The pipe 34 is fixed to the holding frame 6 by being pressed in the direction.

  The pipe expansion punch 12 is formed in a tubular shape, and one end on the second hydraulic cylinder 14 side is connected to the movable wall 13. Further, the tube expansion punch 12 is separate from the movable wall 13 and can be detached from the movable wall 13. The pair of support springs 15, 15 are arranged on both side walls of the second storage chamber 8 b and are separated from the movable wall 13. The second hydraulic cylinder 14 extending to the outside of the second storage chamber 8b includes a second piston (not shown) driven by oil fed from the second oil feeding pipe 16 therein. The second piston is configured to be driven by the hydraulic pressure of the oil fed from the hydraulic pump 22 to the second hydraulic cylinder 14. The movable wall 13 is disposed between the second hydraulic cylinder 14 and the pipe expansion punch 12 and connected to the second piston. When the second piston is driven, the movable wall 13 is configured to advance toward the holding frame 6 along the axial direction of the tube expansion punch 12. Here, since the pipe expansion punch 12 is connected to the movable wall 13, the pipe expansion punch 12 also advances toward the holding frame 6 along the axial direction as the movable wall 13 moves.

  When the second piston is driven in a state where the pipe 34 is fixed to the holding frame 6, the tube expansion punch 12 moves forward together with the movable wall 13 toward the holding frame 6, and the insertion portion 12 c of the tube expansion punch 12 (see FIG. 4 and the like). ) Is inserted into the open end 34 a of the pipe 34 fixed to the holding frame 6. Here, the pressure output from the first hydraulic cylinder 4 is equal to the pressure output from the second hydraulic cylinder 14. Accordingly, the pressure generated by the first piston is equal to the pressure generated by the second piston. The configuration of the tube expansion punch 12 and the operation during tube expansion processing will be described in detail later.

  Next, members housed in the third housing chamber 8c of the housing case 8 will be described. Each of the plurality of replacement clamps 28 has a size that can be accommodated in the accommodation space 6 a of the holding frame 6, and the pipe diameters of the pipes that can be sandwiched are different. The plurality of replacement tube expansion punches 30 can be attached to the second hydraulic cylinder 14, and the diameters of the portions inserted into the open ends of the pipes fixed to the holding frame 6 are different.

  Subsequently, the details of the first oil feeding pipe 2 and the second oil feeding pipe 16 will be described. FIG. 3 is an enlarged plan view of the first oil feeding pipe 2 and the second oil feeding pipe 16. Reference numeral 32 b indicates a connection portion (hereinafter referred to as a first connection portion) between the oil supply branch pipe 32 and the first oil supply pipe 2. Reference numeral 4 a indicates a connecting portion (hereinafter referred to as a second connecting portion) between the first oil feeding pipe 2 and the first hydraulic cylinder 4. Reference numeral 32 a indicates a connecting portion (hereinafter referred to as a third connecting portion) between the oil feeding branch pipe 32 and the second oil feeding pipe 16. Reference numeral 14 a indicates a connection portion (hereinafter referred to as a fourth connection portion) between the second oil feeding pipe 16 and the second hydraulic cylinder 14.

  The first oil feed pipe 2 and the second oil feed pipe 16 are both tubular and are formed so that the pipe diameter is constant. The ratio of the pipe diameter W1 of the first oil feed pipe 2 and the pipe diameter W2 of the second oil feed pipe 16 is such that the pipe diameter W2 of the second oil feed pipe 16 is 1 when the pipe diameter W1 of the first oil feed pipe 2 is 4. It is adjusted to be within the range of 2. Specifically, the diameter of the first oil feeding pipe 2 is 8 mm, and the diameter of the second oil feeding pipe 16 is 3 mm. The ratio of the length of the first oil feed pipe 2 to the length of the second oil feed pipe 16 is such that the length of the second oil feed pipe 16 is 7 to 9 when the length of the first oil feed pipe 2 is 1. It is adjusted to be inside. Specifically, the length of the first oil feeding pipe 2 (the length from the first connecting part 32b to the second connecting part 4a) is 50 mm, and the length of the second oil feeding pipe 16 (from the third connecting part 32a). The length to the fourth connecting portion 14a) is 400 mm. Since the pipe diameters and lengths of the first oil feed pipe 2 and the second oil feed pipe 16 are designed in this way, the timings at which the first piston and the second piston are driven are relatively adjusted. In addition, the ratio of the above-described tube diameter and the ratio of the length are not set independently, and the ratio of the length is within the above range when the ratio of the tube diameter is within the above range. Need to be adjusted so that.

  FIG. 4 shows a plan view of the second storage chamber 8b before the pipe expansion process. FIG. 5 shows a plan view of the second storage chamber 8b during tube expansion processing.

  As shown in FIG. 4, the pipe expansion punch 12 is attached so that the tip thereof faces the opening end 34 a of the pipe 34 fixed to the holding frame 6, and the second piston in the second hydraulic cylinder 14 is driven. Thus, it is possible to advance toward the opening end 34 a of the pipe 34 and to retreat from within the opening end 34 a of the pipe 34. The pipe expansion punch 12 is provided at the large diameter part 12a attached to the second hydraulic cylinder 14, the insertion part 12c inserted into the open end 34 of the pipe 34 at the time of pipe expansion processing, and the tip of the insertion part 12c. And a taper portion 12d. The tapered portion 12d is formed to be slightly inclined toward the inside of the diameter of the tube expansion punch 12. Specifically, the inclination angle of the tapered portion 12d is 45 °. The large-diameter portion 12a and the insertion portion 12c are connected by an inclined surface 12b that is inclined toward the inside of the diameter of the tube expansion punch 12. The outer diameter W6 of the large diameter portion 12a is made equal to the outer diameter W5 of the pipe 34 fixed to the holding frame 6, and the outer diameter W4 of the insertion portion 12c is larger than the outer diameter W5 of the pipe 34 fixed to the holding frame 6. It has been made smaller.

  Next, the operation during the tube expansion process will be described. When the second piston in the second hydraulic cylinder 14 is driven, the tube expansion punch 12 moves forward together with the movable wall 13 toward the holding frame 6, and the movable wall 13 comes into contact with the support spring 15. When the movable wall 13 comes into contact with the support spring 15, the movable wall 13 further advances while compressing the support spring 15 against the elastic force of the support spring 15 by the driving force of the second piston. Along with this, the insertion portion 12 c of the pipe expansion punch 12 is inserted into the open end 34 a of the pipe 34. When the movable wall 13 further advances, the inclined surface 12b is inserted following the insertion portion 12c while the opening end 34a of the pipe 34 is plastically deformed, and a part of the large diameter portion 12a is further opened at the opening end 34a of the pipe 34. Inserted inside. As a result, the opening end 34a of the pipe 34 is expanded along the outer periphery of the large diameter part 12a in a state where a part of the large diameter part 12a of the pipe expanding punch 12 is inserted into the opening end 34a of the pipe 34. At this time, a part of the large diameter portion 12a, the inclined surface 12b, and the insertion portion 12c are in contact with the inside of the pipe 34 among the portions of the pipe expansion punch 12 inserted into the open end 34a of the pipe 34, and are tapered. Only the portion 12d is not in contact with the inside of the pipe 34 due to the inclination.

  The pipe expanding process is terminated when the hydraulic pump 22 is stopped and the driving of the second piston is stopped. Then, the movable wall 13 is pushed back to the second hydraulic cylinder 14 side by the elastic force of the support spring 15, and accordingly, the pipe expansion punch 12 is pulled out from the open end 34 a of the pipe 34. At this time, since the inclined surface 12b is formed, the tube expansion punch 12 can be easily pulled out. Further, since the tapered portion 12d formed at the tip of the pipe expansion punch 12 is not in contact with the inside of the pipe 34, the pipe expansion punch with less force than when the tip of the pipe expansion punch 12 is in contact with the inside of the pipe 34. 12 can be pulled out from the open end 34 a of the pipe 34.

  Next, the configuration of the clamp 36 for holding the pipe 34 will be described. FIG. 6 shows a front view of the clamp 36 before clamping the pipe 34. FIG. 7 shows a front view of the clamp 36 after the piping 34 is clamped (the piping 34 is not shown).

  The clamp 36 is comprised by a pair of clamping pieces 40 and 40, as shown in FIG.6 and FIG.7. Each of the sandwiching pieces 40 has a rectangular shape in which an arc-shaped first cutout portion 40a is provided in a part thereof and an inclined second cutout portion 40b is provided in the other part thereof. The pair of sandwiching pieces 40 and 40 are mutually connected by a rotating shaft 42 attached between the pair of sandwiching pieces 40 and 40 in a state where the first notch portions 40a and the second notch portions 40b face each other. It is pivotally supported so that it can rotate. Then, when the pair of sandwiching pieces 40, 40 are rotated relative to each other to bring the notch surfaces of the second notch part 40b closer to each other, the contact surfaces 40c of the sandwiching piece 40 are separated from each other (FIG. 6). reference). Hereinafter, this state is referred to as an “open state”. On the other hand, when the pair of sandwiching pieces 40, 40 are rotated relative to each other to bring the contact surfaces 40c closer to each other, the notch surfaces of the second notch 40b are separated from each other (see FIG. 7). ). Hereinafter, this state is referred to as a “closed state”.

  In the state where the clamp 36 is closed, as shown in FIG. 7, an annular opening 44 is formed by the first notch 40a. The opening 44 has an elliptical shape that is slightly smaller in the width direction or the vertical direction than the outer diameter W5 of the pipe 34 fixed to the holding portion 6. In the state where the clamp 36 is opened, as shown in FIG. 6, the contact surfaces 40c of the clamping pieces 40 are separated from each other, so that the pipe 34 is axially forward from the gap in FIG. It can be accommodated and placed in a direction that matches the depth direction of the page. When the pipe 34 is clamped by the clamp 36, the pipe 36 is accommodated with the clamp 36 open, and the clamping piece is brought into contact with the vicinity of the lower part of at least one of the first notches of the pair of clamping pieces 40, 40. Press. As a result, the pressed clamping piece 40 is rotated to automatically close the clamp 36, and the outer periphery of the pipe 34 is clamped in the opening 44. In this state, the pipe 34 is not fixed, and the pipe 34 can be fixed by tightening the pipe with the clamp 36 accommodated in the holding frame 6 (see FIG. 2 and the like) as described above. ing.

  The pair of sandwiching pieces 40, 40 is provided with a handle portion 38 at the top thereof. Then, by grasping the handle portion 40 and manually moving the pair of clamping pieces 40, 40 in the direction in which the contact surfaces 40c of the pair of clamping pieces 40, 40 are separated from each other, the clamp 36 is closed. It can be in an open state. When the pipe 34 is taken out from the clamp 36, the pipe portion 34 can be taken out by holding the handle 40 and manually opening the clamp 36. In addition, since the clamp 36 cannot be opened when the clamp 36 is accommodated in the holding frame 6, the pipe 34 is taken out from the holding frame 6 together with the clamp 36 after the pipe expansion process is completed, and then the pipe 34 is removed from the clamp 36. It is necessary to take it out.

  Now, the operation of the pipe expansion device 10 from when the hydraulic pump 22 is driven until the pipe expansion process is started will be described. When the hydraulic pump 22 is driven, the oil is fed to the oil feeding branch pipe 32 via the oil feeding hose 18 and branched by the oil feeding branch pipe 32. Here, the pipe diameters and lengths of the first oil feeding pipe 2 and the second oil feeding pipe 16 are adjusted, so that the pipe 34 held by the holding frame 6 in a state of being sandwiched by the clamp 36 is first fastened and fixed. Thereafter, the insertion portion 12c of the pipe expansion punch 12 is inserted into the open end 34a of the pipe 34 at a predetermined timing. For this reason, in the pipe expansion apparatus 10, the pipe expansion process is not started in a state where the pipe 34 is not fixed, and an unexpected accident or the like can be prevented.

  As described above, in the pipe expansion device 10 according to the embodiment, when the hydraulic pump 22 is driven by holding the pipe 34 between the clamp 36 and the holding frame 6, the pipe 34 is first tightened in the holding frame 6 by hydraulic pressure. After that, the pipe expansion punch 12 is inserted into the open end 34a of the pipe 34 by hydraulic pressure, and the pipe 34 is expanded. For this reason, it is not necessary to adjust the first oil feeding pipe 2 and the second oil feeding pipe 16 every time the pipe expanding process is performed, and the pipe expanding work can be performed only by driving the hydraulic pump 22 once. Can be improved. Moreover, since the transmission order of such hydraulic pressure is designed by the pipe diameter and length between transmissions, no special equipment is required, and low cost is realized.

  Further, in the pipe expansion device 10, when the pipe diameter of the first oil feed pipe 2 is 4, the pipe diameter of the second oil feed pipe 16 is in the range of 1 to 2, and the first oil feed pipe 2 and the second oil feed pipe 2 are in the range. The ratio of the length of the oil pipe 16 is such that the length of the second oil feed pipe 16 is in the range of 7 to 9 when the length of the first oil feed pipe 2 is 1. As a result, when the hydraulic pump 22 is driven, the oil fed to the first hydraulic cylinder 4 and the second hydraulic cylinder 14 is fed to the first hydraulic cylinder 4 before the second hydraulic cylinder 14. Therefore, a specific configuration of the first oil feeding pipe 2 and the second oil feeding pipe 16 is realized. In addition, after the pipe 34 is fixed, the pipe expansion process is adjusted to start at a predetermined timing.

  Further, in the tube expansion device 10, the clamp 36 can place the pipe 34 and can clamp the outer periphery of the placed pipe 34. The first hydraulic cylinder 4 is interposed between the first oil feeding pipe 2 and the holding frame 6, and transmits the oil pressure of oil fed from the hydraulic pump 22 to the holding frame 6. The holding frame 6 can accommodate the clamp 36, and presses the accommodated clamp 36 in the direction of tightening the pipe 34 held between the clamps 36 by the hydraulic pressure transmitted from the first hydraulic cylinder 4. . The pressure to be pressed is equal to the pressure required for inserting the tube expansion punch 12 into the opening end 34 a when the tube expansion punch 12 is inserted into the opening end 34 a of the pipe 34. Thereby, while pinching the outer periphery of the piping 34, the concrete structure which can clamp | tighten and fix the outer periphery of the piping 34 clamped with the hydraulic pressure is implement | achieved.

  Moreover, in the tube expansion apparatus 10, the clamp 36 is comprised by a pair of clamping pieces 40 and 40 pivotally supported mutually, and a pair of clamping pieces 40 and 40 can contact | abut mutually by rotating. The first cutout portions 40a each forming an annular opening 44 in contact with each other. Then, the pipe 34 is brought into contact with at least one of the sandwiching pieces 40 in a state where the pair of sandwiching pieces 40, 40 are not in contact with each other, and the pair of sandwiching pieces 40, 40 is pressed by pressing the contacted sandwiching piece 40. Are rotated and contacted with each other, and the pipe 34 is held in the opening. For this reason, even if it does not rely on manual operation, the piping 34 can be automatically clamped by a clamp only by making the piping 34 contact | abut to the 36 clamping piece of a clamp.

  Further, in the tube expansion device 10, the holding frame 6 is separate from the clamp 36 and can accommodate the clamps 36 having different opening diameters. For this reason, the clamp 36 accommodated in the holding frame 6 can be replaced with another clamp 36 having a different opening diameter, and the tube expansion device 10 can be adapted to pipes of various diameters.

  In the pipe expanding device 10, the second hydraulic cylinder 14 is connected to the second oil feeding pipe 2 and the pipe expanding punch 12, and transmits the oil pressure of the oil injected from the hydraulic pump 22 to the pipe expanding punch 12. The tube expansion punch 12 is tubular and is inserted into the open end 34 a of the pipe 34 fixed to the holding frame 6 by the hydraulic pressure transmitted from the second hydraulic cylinder 14. For this reason, the concrete structure of the 2nd hydraulic cylinder 14 and the pipe expansion punch 12 which can be inserted in the opening end 34a of the piping 34 fixed to the holding frame 6 with oil_pressure | hydraulic is implement | achieved.

  Moreover, in the pipe expansion apparatus 10, the pipe expansion punch 12 has the taper part 12d which inclines toward the inner side of the diameter of the pipe expansion punch 12 in the front-end | tip of the insertion part 12c. For this reason, the tip of the pipe expansion punch 12 when the pipe expansion punch 12 is inserted into the opening end 34 a of the pipe 34 can be prevented from contacting the inside of the pipe 34. Thereby, when the tube expansion punch 12 inserted into the opening end 34a is pulled out from the opening end 34a, the tube expansion punch 12 can be easily pulled out from the opening end 34a.

  In the tube expansion device 10, the movable wall 13 is separate from the tube expansion punch 12, and tube expansion punches having different diameters of the tube expansion punch 12 can be attached to the movable wall 13. For this reason, the tube expansion punch 12 connected to the movable wall 13 can be replaced with another tube expansion punch 12 having a different diameter, and the diameter of the portion expanded in the tube expansion device 10 can be adapted to various diameters. it can.

  The tube expansion device 10 includes a storage case 8 in which a mechanism for performing the tube expansion processing is stored, and a tripod 20 that supports the storage case 8 and is removable from the storage case 8. The hydraulic pump 22 is portable, and the hydraulic pump 22 can be attached to the table 24 supported by the tripod 20. For this reason, a mechanism for performing pipe expansion processing is accommodated in the accommodation case 8, and when the tube expansion device 10 is used, the accommodation case 8 is attached to the tripod 20, and the portable hydraulic pump 22 is attached to the tripod 20. it can. For this reason, the tube expansion device 10 can be easily transported.

  Moreover, in the pipe expansion apparatus 10, the pipe expansion process of copper piping used in order to distribute | circulate the heat medium for air conditioning equipment can be performed. Since the pipe expansion device 10 can expand the pipe without the need for an annealing process, it can be suitably used as an apparatus for expanding the heat medium pipe for an air conditioner.

  The correspondence between the configuration of the embodiment and the configuration of the present invention will be described. A combination of the first hydraulic cylinder 4, the holding frame 6, and the clamp 36 is an example of a “clamping portion”. A combination of the second hydraulic cylinder 14 and the tube expansion punch 12 is an example of the “tube expansion portion”. The first cutout 40a is an example of a “cutout”. The tripod 20 is an example of a “support base”.

The modifications of the above embodiment are listed below.
(1) In the embodiment, specific numerical values are shown for the diameters and lengths of the first oil supply pipe and the second oil supply pipe, but the oil is supplied to the first hydraulic cylinder before the second hydraulic cylinder. The pipe diameters and lengths of the first oil feed pipe and the second oil feed pipe need only be adjusted, and the pipe diameters and lengths of the first oil feed pipe and the second oil feed pipe are not limited to specific values.

(2) In the embodiment, a configuration is adopted in which a copper pipe used for circulating a heat medium for air conditioning equipment is fixed to the holding frame, but the pipe used for other uses is fixed to the holding frame. A configuration may be adopted.

(3) In the embodiment, a configuration using a clamp that automatically closes when a pipe is placed is employed, but a configuration using a clamp that is manually closed may be employed.

(4) In the embodiment, a configuration in which the tube expansion device can be transported is employed, but a configuration in which the tube expansion device cannot be transported as a fixed facility may be employed.

(5) In the embodiment, the configuration in which the outer diameter of the large diameter portion of the pipe expansion punch is made equal to the outer shape of the pipe, but the outer diameter of the large diameter portion of the pipe expansion punch is assumed to be larger than the outer diameter of the pipe. You may employ | adopt the structure which is.

  As mentioned above, although embodiment of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

  2: 1st oil supply pipe, 4: 1st hydraulic cylinder, 4a: 2nd connection part, 6: Holding frame, 6a: Storage space, 8: Storage case, 8a: 1st storage chamber, 8b: 2nd storage chamber, 8c: third storage chamber, 10: tube expansion device, 12: tube expansion punch, 12a: large diameter portion, 12b: inclined surface, 12c: insertion portion, 12d: taper portion, 13: movable wall, 14: second hydraulic cylinder, 14a: 4th connection part, 15: support spring, 16: 2nd oil supply pipe, 18: oil supply hose, 20: tripod, 21: caster, 22: hydraulic pump, 24: table, 26: support shaft, 28: exchange Clamp, 30: replacement pipe expansion punch, 32: oil supply branch pipe, 32a: third connection part, 32b: first connection part, 34: piping, 36: clamp, 38: handle part, 40: clamping piece, 40a : First cutout part, 40b: second cutout part, 40c: contact part, 42: possible Axis, 44: opening

Claims (10)

A hydraulically driven pipe expansion device that expands the pipe by plastically deforming the open end of the pipe,
A hydraulic pump;
A clamping part capable of clamping the outer periphery of the pipe;
A large-diameter portion having a large-diameter portion that is larger than the inner diameter of the pipe that is sandwiched by the sandwiching portion, and an insertion portion that is insertable into the open end of the pipe on the tip side from the large-diameter portion; ,
A first oil feeding pipe that connects the hydraulic pump and the clamping unit and feeds oil from the hydraulic pump to the clamping unit;
A second oil feeding pipe that connects the hydraulic pump and the pipe expansion section and feeds oil from the hydraulic pump to the pipe expansion section;
The clamping part is capable of pressing and fixing the outer periphery of the pipe clamped by the clamping part by the hydraulic pressure of oil fed from the hydraulic pump to tighten and fix the pipe.
The pipe expansion part is inserted into the opening end of the pipe held by the clamping part by the hydraulic pressure of oil fed from the hydraulic pump, and the opening end can be plastically deformed.
When the hydraulic pump is driven, oil is supplied to the sandwiching portion and the pipe expanding portion so that the pipe is fixed by the clamping portion before the pipe expanding portion is inserted into the opening end of the pipe. A hydraulically driven pipe expansion device, wherein the diameter and length of the first oil supply pipe and the second oil supply pipe are adjusted in order to supply oil. The ratio of the diameter of the first oil supply pipe to the second oil supply pipe is such that the tube diameter of the second oil supply pipe is in the range of 1 to 2 when the diameter of the first oil supply pipe is 4. And,
The ratio of the lengths of the first oil supply pipe and the second oil supply pipe is such that the length of the second oil supply pipe is within a range of 7 to 9 when the length of the first oil supply pipe is 1. The hydraulically driven pipe expanding device according to claim 1. The clamping unit includes a clamp, a first hydraulic cylinder, and a holding frame,
The clamp is capable of mounting the pipe, and can clamp the outer periphery of the mounted pipe,
The first hydraulic cylinder is interposed between the first oil feed pipe and the holding frame, and transmits oil pressure of oil fed from the hydraulic pump to the holding frame.
The holding frame can accommodate the clamp, and presses the accommodated clamp in a direction of tightening the pipe sandwiched between the clamps by the hydraulic pressure transmitted from the first hydraulic cylinder. When the expanded portion is inserted into the open end of the pipe in the expanded portion, the pressure is equal to the pressure required for the expanded portion to be inserted into the open end. 3. The hydraulically driven pipe expanding device according to claim 1 or 2, wherein The clamp is composed of a pair of clamping pieces that are pivotally supported with respect to each other,
The pair of sandwiching pieces can be brought into contact with each other by rotating, and each has a notch portion that forms an annular opening in contact with each other,
By bringing the pipe into contact with at least one of the holding pieces in a state where the pair of holding pieces are not in contact with each other, and pressing the held holding pieces, the pair of holding pieces rotate relative to each other. The hydraulically driven pipe expanding device according to claim 3, wherein the pipe is abutted and the pipe is held in the opening.   5. The hydraulically driven pipe expanding device according to claim 4, wherein the holding frame is separate from the clamp and can accommodate clamps having different diameters of the openings. The pipe expansion part includes a second hydraulic cylinder, a pipe expansion punch having the large diameter part and the insertion part,
The second hydraulic cylinder is connected to the second oil feeding pipe and the pipe expansion punch, and transmits oil pressure of oil injected from the hydraulic pump to the pipe expansion punch,
6. The pipe expansion punch according to claim 3, wherein the pipe expansion punch is tubular and is inserted into an opening end of the pipe clamped by the clamping portion by the hydraulic pressure transmitted from the second hydraulic cylinder. The hydraulic drive type pipe expansion device according to any one of the above.   7. The hydraulically driven pipe expanding apparatus according to claim 6, wherein the pipe expanding punch has a taper part inclined toward the inside of the diameter of the pipe expanding punch at a tip of the insertion part.   8. The hydraulic drive type according to claim 6, wherein the second hydraulic cylinder is separate from the pipe expansion punch and can be attached with a pipe expansion punch having a different diameter of the insertion portion. Tube expansion equipment. A housing case for housing the sandwiching portion and the tube expansion portion;
A support base that supports the storage case and is removable from the storage case;
9. The hydraulically driven pipe expanding device according to claim 1, wherein the hydraulic pump is portable and the hydraulic pump is attached to the support base. 10.   10. The hydraulically driven pipe expanding device according to claim 1, wherein the pipe is a copper pipe used for circulating a heat medium for air conditioning equipment. 11.

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