JP6731709B2 - Crimping tool for crimp type pipe fittings - Google Patents

Description

TECHNICAL FIELD The present invention relates to a crimping tool for crimping type pipe joints for crimping a crimping type pipe joint which is a caulking joint for connecting metal pipes.

There are various types of pipe joints used for connecting pipes, such as a screw-in type, a welded type, and a type that uses a shape memory alloy, and they are properly used according to the application.

In the case of using an evaporator or condenser that constitutes a refrigeration cycle, such as a packaged air conditioner, as a heat exchanger with the conditioned air in air conditioning equipment, the refrigeration cycle components are connected by pipes and fluorocarbons are provided inside the pipes. A cycle in which a refrigerant such as a system refrigerant is circulated and circulated is formed, and the refrigerant undergoes a phase transition between gas and liquid in the cycle to perform heat exchange. Pipes (refrigerant pipes) used for such air-conditioning equipment are required not only to be completely airtight but also to have chemical and physical properties such as corrosion resistance, pressure resistance, and ease of processing, and pressure loss of the refrigerant. Various properties such as mechanical shape that can be made as small as possible are required. Conventionally, copper (particularly, high-purity phosphorous deoxidized copper) has been mainly used as a material that can satisfy such characteristics, and the connection between the copper pipe and the pipe joint (or between copper pipes) is a brazing material. It is generally performed by brazing (melting) in which a metal is melted to bond metals to each other. However, in recent years, in response to the soaring price of copper, which is a raw material for copper tubes, it is under studying to use aluminum, which is a cheaper material, instead of copper. Also, brazing is an artisan work that requires a high level of skill, and since the labor costs of skilled craftsmen are high, it is also desirable to use a simpler connection method to save the labor of the connection work. Has been done.

Here, when brazing a copper pipe, the melting point of copper is relatively high at 1085° C., and it is preferable to use phosphorus copper braze or silver braze having a melting point of about 600° C. to 800° C. as a filler material. It is most suitable for penetration into gaps, prevention of voids, which are defects, and corrosion resistance, but in brazing, in order to make the filler material sufficiently penetrate between the pipe joint and the pipe, However, as described above, the melting point of phosphor copper solder or silver solder is sufficiently lower than that of copper. Therefore, even if the brazing temperature is kept at 760° C. to 850° C., which is higher than the melting point, there is no concern that the copper as the base material will melt. On the other hand, when aluminum is used as the material of the pipe, the melting point of aluminum as the base material is as low as 660° C., whereas the melting point of aluminum brazing filler metal used as a filler is around 590° C., which are close to each other. For this reason, if the temperature is raised to infiltrate the molten aluminum brazing material, the base material may be fused together, and it is difficult to perform brazing to prevent holes from being formed in the pipe. Such problems can be avoided by using a dry crimp type pipe joint that does not require brazing for connection.

In air-conditioning equipment that is not a refrigerant pipe, for example, in the type of air-conditioning equipment that uses water (cold water) as a heat medium, pressure is applied to the metal to deform it (caulking) to crimp the pipe. A crimp type pipe joint device of a type can be used for a pipe joint, and is partially used for connecting water pipes that convey water.

Compared to such a water pipe, when the joint is used for the above-mentioned refrigerant pipe, the joint is required to have higher performance. That is, since it is required to realize perfect airtightness under a high pressure of 5 to 10 MPa, it is necessary to connect the pipe and the pipe joint with a stronger force (caulking force). As a crimping type pipe joint device capable of meeting such a demand, there is a type of caulking joint in which an insert member for lining the pipe is inserted into the pipe and the pipe is supported from the inside by the insert member to cope with a strong caulking force.

As shown in FIG. 3, the crimping type pipe joint device (caulking joint) includes an insert member 2 inserted into the inner surface of the joint end portion of the pipe 1 and a joint member fitted to the outer surface of the joint end portion of the pipe 1. 3 and a nut 4 fitted to the outer surface of the end of the joint member 3.

The insert member 2 is a metal member provided with a substantially cylindrical main body having an even circular cross section and a flange 2a protruding from one end of the outer periphery of the main body, and the insert member 2 has an inner diameter of the pipe 1. Use a body whose outer diameter is approximately the same. As the material of the insert member 2, for example, high strength steel is used.

The joint member 3 has a sleeve 3a into which the joint ends of the pipe 1 are inserted at both ends, and a flange provided on the outer peripheral surface of the central portion of the sleeve 3a in the axial direction at a predetermined interval in the axial direction. It is provided with two fulcrum portions 3b having a shape, and an annular groove portion 3c formed between the fulcrum portions 3b so as to have a diameter smaller than the outer diameter of the sleeve 3a. That is, the joint member 3 has two ends of the pipe 1 at both ends of an annular groove 3c which connects the two pipes 1 communicating with each other by inserting the joint ends of the pipe 1 at both ends. Is a metal member having a sleeve 3a for inserting and connecting the joint end portion thereof, and a fulcrum portion 3b protruding outward on the side of the annular groove portion 3c on the base side of the sleeve 3a. The sleeve 3a has a substantially cylindrical shape to be fitted onto the pipe 1, and a step portion 3i (FIG. 6) is formed on each end side of the inner surface of the annular groove portion 3c so as to project to the inner circumference of the sleeve 3a. (See) is provided. The outer peripheral surface of the sleeve 3a has a taper shape in which the outer diameter gradually decreases from the base portion toward the end portion, starting from a position toward the end portion by a predetermined distance from the base portion. The sleeve 3a, the fulcrum portion 3b, and the annular groove portion 3c form the joint member 3. In FIG. 3, a straight pipe provided with a sleeve 3a for projecting the fulcrum portion 3b on the outer surface of the base portion at one end of the annular groove portion 3c, and a sleeve 3a for projecting the fulcrum portion 3b on the outer surface of the base portion at the other end of the annular groove portion 3c. The joint member 3 having a nipple shape is illustrated. As the material of the joint member 3, particularly, the sleeve 3a portion is made of steel having a certain malleability. The joint member 3 is not limited to the one used for joining the pipes 1 having the same diameter, but a reducer type used for joining the pipes 1 having different diameters, or a T-shaped or Y-shaped tubular body portion. Various shapes such as those with three pipe connection parts, those with two pipe connection parts in the L-shaped pipe body part, those in which two pipe connection parts are connected by the flexible pipe pipe part Can be used.

The nut 4 is a substantially cylindrical metal member, and the inner peripheral surface thereof has a tapered shape in which the inner diameter gradually decreases from one end to the other end from one end to a predetermined distance. At the time of connection, the inner diameter of at least a part of the inner peripheral surface is smaller than the outer diameter of at least a part of the outer peripheral surface of the sleeve 3a of the joint member 3. More specifically, the inner diameter on the larger diameter side (one end) is slightly smaller than the outer diameter on the larger diameter side (base portion) of the sleeve 3a of the joint member 3, and the inner diameter on the smaller diameter side (other end) is the joint. It is desirable to use a member having a size slightly smaller than the outer diameter of the sleeve 3a of the member 3 on the small diameter side (tip), and further, the inner diameter of the nut 4 on the large diameter side (one end) should be smaller than the outer diameter of the sleeve 3a. It is more desirable that it is slightly larger than the outer diameter of the smaller side (tip). As the material of the nut 4, for example, high strength steel is used.

When performing the joining work of the pipe 1 using the crimping type pipe joint which is the crimp joint, first, as shown in FIG. 4, the main body portion of the insert member 2 is attached to the inner surface of the joint end portion of the pipe 1. The collar portion 2a is inserted until it comes into contact with the end surface of the tube 1. As described above, the outer diameter of the main body portion is substantially equal to the inner diameter of the pipe 1, and the flange portion 2a is projected on one end side of the outer periphery of the main body portion. The member 2 stops when the main body is inserted up to the position of the collar 2a. In addition, burrs are often formed at the end of the pipe 1 when the pipe 1 is cut, and deburring may be performed by a reamer or the like before inserting the insert member 2. Next, as shown in FIG. 5, a nut 4 is fitted on the outer surface of the joint end portion of the pipe 1 into which the insert member 2 is inserted, and a wettable adhesive that assists in joining metals (not shown) is provided. Apply. When the end portion of the pipe 1 is inserted into the sleeve 3a of the joint member 3, the nut 4 is passed through the pipe 1 so that the end portion (one end side) on the larger inner diameter side faces the joint member 3 side. Thereafter, as shown in FIG. 6, a joint member 3 is fitted on the outer surface of the joint end portion of the pipe 1, and a nut is attached by a crimping tool 5 (see FIGS. 8 and 9) for a crimping pipe joint which is a caulking joint. 4 is moved in the axial direction of the tube 1 as shown in FIG. Since the inner peripheral surface of the nut 4 is tapered and the inner diameter on the large side is larger than the outer diameter of the tip of the sleeve 3a and smaller than the outer diameter of the base portion, one end side of the nut 4 is A part of the sleeve 3a is externally fitted and temporarily stops there. Thereafter, when the nut 4 is further moved by the crimping tool 5, the sleeve 3a of the joint member 3 made of a malleable metal material is pressed against the nut 4 having high strength in the axial direction with a strong force. As a result, the inner peripheral surface of the nut 4 receives a force directed inward in the radial direction, deforms (caulks) so as to be compressed, and sneaks into the inside of the nut 4. As the sleeve 3a goes deeper into the nut 4, the deformation of the sleeve 3a increases, and the caulking force as a repulsive force against the deformation increases, and this repulsive force is transmitted to the vise portion of the crimping tool 5 as a torque. The nut 4 is fitted on the outer surface of the joint member 3 so that the joint member 3 is airtightly joined to the joint end of the pipe 1.

As shown in FIGS. 8 and 9, the crimping tool 5 is provided with a crimping unit 7 composed of an electric hydraulic cylinder extending in the horizontal direction on an upper portion of a grip type tool main body 6 to which a trigger switch 6a is attached. The first support tool 8 and the second support tool 9 for supporting the pipe 1 and the joint member 3 are attached to and detached from the cylinder body 7a of No. 7 and the rod portion 7b extending from the cylinder body 7a so as to extend and contract in the axial direction. It can be freely attached.

As shown in FIGS. 8 to 10, the first supporting member 8 is integrally provided on the first leg portion 8a and the first leg portion 8a that is detachably attached to the tip end portion of the cylinder body 7a. The first pedestal portion 8b is provided, and a U-shaped first cutout portion 8c for supporting the pipe 1 is formed at one end portion of the first pedestal portion 8b in the axial direction of the cylinder body 7a.

8 to 10, the second support tool 9 is integrally mounted on the second leg 9a and a second leg 9a that is detachably attached to the tip of the rod portion 7b. And a second pedestal portion 9b provided on the second pedestal portion 9b, and a U-shaped second cutout portion 9c for supporting the annular groove portion 3c of the joint member 3 is provided at one end portion of the second pedestal portion 9b in the axial direction of the rod portion 7b. Has been formed.

By the way, as the first support tool 8 and the second support tool 9, a plurality of sets in which the sizes of the first notch portion 8c and the second notch portion 9c are changed according to the pipe diameter are prepared, and a plurality of types are prepared. The tube 1 having the outer diameter of

When the crimping tool 5 is used, first, as shown in FIG. 8A, the first support tool 8 and the second support tool 9 corresponding to the diameter of the pipe 1 to be joined are selected. As shown in (b), the first leg 8a of the first support 8 is attached to the tip of the cylinder body 7a, and the second leg of the second support 9 is attached to the tip of the rod 7b. 9a is attached. Subsequently, as shown in FIG. 8C, the pipe 1 is set in the first notch portion 8c of the first pedestal portion 8b of the first support tool 8 and the second pedestal of the second support tool 9 is set. The annular groove portion 3c of the joint member 3 is set in the second cutout portion 9c of the portion 9b. When the trigger switch 6a is pressed from this state, the rod portion 7b of the crimping unit 7 contracts in the direction of being pulled into the cylinder body 7a, and this movement is transmitted to the vise portion supporting the pipe 1. As a result, the nut 4 relatively moves in the axial direction of the pipe 1, and the sleeve 3a of the joint member 3 made of a malleable metal material exerts a strong axial force on the nut 4 having high strength. As a result, the nut 4 is pushed into the inside of the nut 4 while being deformed (caulked) so as to be compressed by receiving a force directed inward in the radial direction from the inner peripheral surface of the nut 4, so that the nut 4 moves. The pipe 1 is relatively moved in the axial direction and fitted on the outer surface of the joint member 3, and the joint member 3 is hermetically joined to the joint end portion of the pipe 1 (see FIG. 7 ).

For example, Patent Document 1 discloses a general technical level related to the crimping tool for the crimping type pipe joint (caulking joint).

JP-A-6-249374

However, like the conventional crimping tool 5, the first supporting member 8 and the first supporting member 8 in which the sizes of the first notch portion 8c and the second notch portion 9c are changed to correspond to the pipes 1 having a plurality of outer diameters If a plurality of sets of the two support tools 9 are prepared, the first support tool 8 and the second support tool 9 have to be attached to and detached from the crimping tool 5 in accordance with the pipe diameter at each site, which makes the replacement work difficult. It took time and effort, and improvement was desired.

Further, since the weight of each of the first support tool 8 and the second support tool 9 is about 1.2 kg, for example, when there are five types of pipes 1 having an outer diameter, A total of ten first support tools 8 and second support tools 9 had to be prepared, and the weight thereof was about 12 kg, and the burden on the operator was very heavy even if they were carried around.

The present invention has been made in view of the above conventional problems, and may eliminate the need to replace the first support tool and the second support tool according to the pipe diameter for the crimping tool, and improve work efficiency, and An object of the present invention is to provide a crimping tool for a crimping type pipe joint, which can remarkably reduce the burden on the operator during the transportation of the first support tool and the second support tool.

The present invention relates to a cylindrical main body having a uniform circular cross section that is inserted into the inner surface of a joint end of a pipe made of a malleable metal material, and has an outer diameter that substantially matches the inner diameter of the pipe. An insert member, which is a high-strength steel consisting of a flange portion protruding to one end portion of the outer periphery of the main body portion, a joint member made of a malleable metal material fitted to the outer surface of the joint end portion of the pipe, A compressive force is exerted on the inner surface of the joint member end by deforming the outer surface of the joint member end by moving a force inward in the radial direction from the inner peripheral surface with respect to the outer surface of the end portion of the joint member, in the pipe axial direction. With a nut that is high-strength steel that allows it to slip inside itself,
The joint member is connected by inserting the joint ends of the two pipes into both ends of an annular groove that makes the joint ends of the two pipes face each other and communicates and connects the two pipes with each other. A sleeve for holding the sleeve, the annular groove portion is provided on the base side of the sleeve, and fulcrums protruding outward on both sides of the annular groove portion are provided, and the sleeve has a cylindrical shape to be fitted onto a pipe. A step portion is formed on each end side of the inner surface of the annular groove portion so as to project to the inner circumference of the sleeve, and the outer peripheral surface of the sleeve starts from a position toward the end portion by a predetermined distance from the base portion. Is a metal member having a tapered portion whose outer diameter gradually decreases from the base portion toward the end portion, and the collar of the insert member with respect to the inner step portion of the sleeve of the joint member. The parts are attached so that they face each other,
The inner peripheral surface of the nut is a tool for crimping a crimping type pipe joint that is a caulking joint, the inner diameter of which is gradually reduced from one end to the other end from one end to a predetermined distance,
A crimping unit which is installed at the end of the grip type tool body so as to extend and contract so as to extend in a direction intersecting with the grip type tool body, and is attached to the expanding and contracting section of the crimping unit so as to be close to and away from each other and detachable from each other. A first support and a second support,
A stepped portion projecting the nut and the joint member to the inner periphery of the base portion of the sleeve on the outer surface of the joint end portion of the pipe that is inserted into the main body portion of the insert member until the collar portion hits the end surface of the joint end portion. The first support while setting the end of the nut and the fulcrum of the joint member between the ends of the first support and the second support. With the pipe supported by the tool and the second support, the crimping unit is contracted to move the pipe in the axial direction of the pipe while pushing the nut end to fit the outer surface of the joint member to the joint end of the pipe. In a crimping tool for crimping type pipe joints that airtightly joins joint members,
The crimping unit includes a cylinder main body installed in the upper portion of the grip type tool main body so as to extend in the horizontal direction, and a rod portion extending from the cylinder main body in an axially expandable and contractible manner,
Each of the first support tool and the second support tool has a U-shaped first notch and a second notch which are open upward and support a plurality of tubes having different diameters. A plurality of steps are formed so that the inner diameter is gradually expanded from the bottom side of the support tool toward the upper opening, and the end portion of the nut and the nut are formed by the peripheral side surfaces of the first notch and the second notch. The fulcrum portion of the joint member is sandwiched, and the pipe is supported by the plane of the first cutout portion or the second cutout portion ,
The second support includes a second leg that is detachably attached to the tip of the rod, and a second pedestal that is integrally provided on the second leg. The one end portion in the axial direction of the rod portion of, the plurality of second cutouts are formed,
The second pedestal portion of the second support is provided with a U-shaped second concave groove having a diameter larger than that of the second cutout portion and a side surface of which comes into contact with the end surface of the nut or the fulcrum portion of the joint member. A plurality of steps are formed so that the inner diameter is expanded stepwise from the bottom side of the second support tool toward the open end side so as to be adjacent to the two notches, and the fulcrum of the nut or the joint member is formed by the second groove. The present invention relates to a crimping tool for a crimping type pipe joint, which is characterized in that either of the parts is supported from below .

In the crimp type pipe joint device, the first support member includes a first leg portion detachably attached to a tip end portion of the cylinder body, and a first pedestal portion integrally provided on the first leg portion. The first pedestal portion is formed at one end portion in the axial direction of the cylinder body with the plurality of first cutout portions,
Wherein the first pedestal of the first support member, the end surface or the first concave groove of U-shaped side surface support portion of the joint member abuts said and said nut with a large diameter than the first cut-out portion, wherein It is preferable to form a plurality of steps so that the inner diameter is gradually increased from the bottom side to the open end side of the first supporting tool so as to be adjacent to the first cutout.

According to the crimping tool for crimping type pipe joints of the present invention, it is possible to eliminate the need for exchanging the first supporting tool and the second supporting tool depending on the pipe diameter of the crimping tool, and improve the working efficiency. Further, it is possible to achieve an excellent effect that the burden on the operator during transportation of the second support tool can be significantly reduced.

It is a figure which shows the 1st support tool in the Example of the crimping tool for crimp type pipe joints of this invention, (a) is a front view, (b) is a side view, (c) is a top view. It is a figure which shows the 2nd support tool in the Example of the crimping tool for crimp type pipe joints of this invention, (a) is a front view, (b) is a side view, (c) is a top view. It is a side view showing an example of the crimp type pipe joint which is a conventional crimp joint, and is a figure showing the state before assembly. It is a side view showing an example of the crimp type pipe joint which is a conventional crimp joint, and is a figure showing the state where the insert member was inserted in the joint end inner surface of a pipe. It is a side view showing an example of a crimp type pipe joint which is a conventional crimp joint, and is a figure showing a state where a nut was fitted to the outer surface of the joint end of a pipe in which an insert member was inserted. It is a side view showing an example of the crimp type pipe joint which is a conventional crimp joint, and is a figure showing the state where the joint member was fitted to the joint end part outer surface of the pipe in which the insert member was inserted. It is a side view which shows an example of the crimp type pipe joint which is a conventional crimp joint, and is a figure which shows the state which fitted the nut to the joint member outer surface and airtightly joined the joint member to the joint end part of a pipe. It is a side view which shows an example of the conventional crimping tool for crimp type pipe joints, (a) is a figure which shows the state which mounts the 1st support tool and 2nd support tool corresponding to a pipe diameter, (b) is a figure The figure which shows the state which mounted one support tool and the 2nd support tool, (c) is a figure which shows the state which set the pipe to the 1st support tool and the 2nd support tool. It is a top view which shows an example of the conventional crimping tool for crimp type pipe joints. It is a front view which shows the 1st support tool and the 2nd support tool in an example of the conventional crimping tool for crimp type pipe joints.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show an embodiment of a crimping tool for crimping type pipe joints according to the present invention. In the drawings, the parts denoted by the same reference numerals as those in FIGS. The structure is similar to that of the conventional one shown in FIGS. 3 to 10, but the feature of this embodiment is that the first support tool 8 and the second support tool 9 are respectively provided as shown in FIGS. , A U-shaped first notch 8c and a second notch 9c for supporting a plurality of pipes (five kinds in the example shown in the figure) having different diameters are provided on the bottom side of the first support tool 8 and the second support tool 9. From the above to the open end side, a plurality of steps (five steps in the example in the figure) are formed so that the inner diameter is expanded stepwise.

In the case of the present embodiment, as shown in FIGS. 1(a), 1(b) and 1(c), the first support member 8 is a cylinder body 7a (of a crimping unit 7 composed of an electric hydraulic cylinder). (See FIG. 8), a first leg portion 8a detachably attached to a tip end portion thereof, and a first pedestal portion 8b integrally provided on the first leg portion 8a, and a cylinder of the first pedestal portion 8b. The plurality of first notches 8c are formed at one end in the axial direction of the main body 7a. Further, as shown in FIGS. 1(a) and 1(c), the first pedestal portion 8b of the first support member 8 has a U-shaped first diameter larger than that of the first cutout portion 8c. The recessed groove 8d is formed in a plurality of stages so that the inner diameter is gradually expanded from the bottom side of the first support tool 8 toward the open end side in the form of being adjacent to the first cutout portion 8c. Accordingly, the nut 4 or the fulcrum portion 3b (see FIG. 7) of the joint member 3 can be supported by the first concave groove 8d.

Further, the second supporting member 9 is detachably attached to the tip end portion of the rod portion 7b (see FIG. 8) of the crimping unit 7, as shown in FIGS. 2(a), 2(b) and 2(c). A second leg portion 9a mounted on the second leg portion 9a, and a second pedestal portion 9b integrally provided on the second leg portion 9a. The second pedestal portion 9b is provided at one end portion in the axial direction of the rod portion 7b with A plurality of second cutouts 9c are formed. Further, as shown in FIGS. 2(a) and 2(c), the second pedestal 9b of the second support 9 has a U-shaped second recess having a diameter larger than that of the second notch 9c. The groove 9d is formed in a plurality of stages so that the inner diameter is gradually increased from the bottom side to the open end side of the second support 9 in the form of being adjacent to the second cutout 9c, and as necessary. The nut 4 or the fulcrum portion 3b (see FIG. 7) of the joint member 3 can be supported by the second groove 9d.

Next, the operation of the above embodiment will be described.

When using the crimping tool 5 shown in FIG. 8, first, the first leg 8a of the first supporting tool 8 shown in FIG. The second leg portion 9a of the second support tool 9 shown in FIG. 2 is attached to the tip portion of the rod portion 7b (see FIG. 8). Subsequently, the pipe 1 is set in the first notch portion 8c formed in the first pedestal portion 8b of the first support tool 8 and the first pedestal portion 9b of the second support tool 9 is formed. The annular groove portion 3c of the joint member 3 is set in the two cutout portions 9c.

At this time, in the case of the pipe 1 having the maximum diameter, the pipe 1 is set so as to be dropped into the uppermost first cutout portion 8c in FIG. 1A, and the uppermost portion in FIG. The annular groove 3c of the joint member 3 is set so as to be dropped into the second notch 9c.

Further, in the case of the pipe 1 having the smallest diameter, the pipe 1 is set so as to be dropped into the first cutout portion 8c at the bottom of FIG. The annular groove portion 3c of the joint member 3 is set so as to be dropped into the second cutout portion 9c.

In the case of the pipe 1 having an intermediate diameter between the maximum diameter and the minimum diameter, the pipe 1 is set so as to be dropped into the first cutout portion 8c at the corresponding height position in FIG. The annular groove portion 3c of the joint member 3 is set so as to be dropped into the second notch portion 9c at the corresponding height position in FIG. 2(a).

When the trigger switch 6a (see FIG. 8) of the grip type tool body 6 of the crimping tool 5 is pressed from this state, the rod portion 7b of the crimping unit 7 contracts in the direction of being pulled into the cylinder body 7a, and the nut 4 is The pipe 1 is relatively moved in the axial direction and fitted on the outer surface of the joint member 3, and the joint member 3 is hermetically joined to the joint end portion of the pipe 1 (see FIG. 7 ).

As a result, like the conventional crimping tool 5, the first supporting member 8 in which the sizes of the first notch portion 8c and the second notch portion 9c are changed to correspond to the pipes 1 having a plurality of outer diameters, and Unlike the case where a plurality of sets of the second support tools 9 are prepared, it is not necessary to attach and detach the first support tool 8 and the second support tool 9 to the crimping tool 5 at each site according to the pipe diameter, and exchange. Work and time are saved.

Although the weight of each of the first support tool 8 and the second support tool 9 is about 1.2 kg, for example, even if there are five types of pipes 1 having an outer diameter. It suffices to prepare a total of two pieces of the first support tool 8 and the second support tool 9. Since the weight of the first support tool 8 and the second support tool 9 can be suppressed to about 2.4 kg, the operator can mount the first support tool 8 and the second support tool 9 on each other. It can be easily carried and the burden on the operator is greatly reduced.

In this way, it is possible to eliminate the need to replace the first support tool 8 and the second support tool 9 according to the diameter of the tube 1 with respect to the crimping tool 5, and it is possible to improve the work efficiency, and at the same time, the first support tool 8 and the second support tool 9 It is possible to significantly reduce the burden on the operator during transportation.

The crimping unit 7 is an electrohydraulic system including a cylinder body 7a installed in the upper portion of the grip type tool body 6 so as to extend in the horizontal direction, and a rod portion 7b extending from the cylinder body 7a so as to extend and contract in the axial direction. Since it is a cylinder, a larger compressive force can be efficiently applied between the joint member 3 and the nut 4 as compared with a manual tool, and when the joint member 3 is airtightly joined to the joint end portion of the pipe 1. It is effective in improving reliability.

The first support member 8 includes a first leg portion 8a that is detachably attached to the tip end portion of the cylinder body 7a, and a first pedestal portion 8b that is integrally provided on the first leg portion 8a. The first pedestal portion 8b is provided with the plurality of steps of the first cutout portions 8c at one end portion in the axial direction of the cylinder body 7a, and the first pedestal portion 8b of the first support 8 has the first pedestal portion 8b. The U-shaped first groove 8d, which has a diameter larger than that of the notch 8c and supports the nut 4 or the joint member 3, is adjacent to the first notch 8c. Since a plurality of steps are formed so that the inner diameter is gradually expanded from the to the open end side, the nut 4 or the fulcrum portion 3b of the joint member 3 is formed by the first groove 8d as needed (see FIG. 7). Can be supported, and the joining operation of the pipe 1 can be stably performed.

Furthermore, the second support member 9 includes a second leg portion 9a that is detachably attached to the tip end portion of the rod portion 7b, and a second pedestal portion 9b that is integrally provided on the second leg portion 9a. The second pedestal 9b is provided with the plurality of second notches 9c at one end in the axial direction of the rod portion 7b of the second pedestal 9b. A U-shaped second groove 9d having a diameter larger than that of the two notches 9c and supporting the nut 4 or the joint member 3 is opened from the bottom side of the second support 9 so as to be adjacent to the second notches 9c. Since a plurality of steps are formed so that the inner diameter is gradually expanded toward the end side, the nut 4 or the fulcrum portion 3b of the joint member 3 (see FIG. 7) is supported by the second groove 9d as necessary. Therefore, the operation of joining the pipes 1 can be performed more stably.

The crimping tool for crimping pipe fittings of the present invention is not limited to the above-mentioned embodiment, and the number of steps of the first notch and the first groove and the second notch and the second groove is not limited. Needless to say, the present invention is not limited to five stages, and various changes can be made without departing from the scope of the present invention.

1 tube 2 insert member 3 joint member 3a sleeve 3i step part 4 nut 5 crimping tool 6 grip type tool body 7 crimping unit 7a cylinder body 7b rod part 8 first support 8a first leg 8b first pedestal 8c first Notch part 8d First groove 9 Second support 9a Second leg 9b Second pedestal 9c Second notch 9d Second groove

Claims (2)

A cylindrical main body having an even circular cross section to be inserted into the inner surface of a joint end of a pipe made of a malleable metal material and having an outer diameter substantially equal to the inner diameter of the pipe, and an outer periphery of the main body Insert member made of a high-strength steel having a flange portion protruding from one end of the pipe, a joint member made of a malleable metal material fitted on the outer surface of the joint end of the pipe, and an end of the joint member. By moving a force directed radially inward from the inner peripheral surface with respect to the outer surface of the portion in the pipe axial direction, a compressive force is exerted on the outer surface of the end portion of the joint member, and while deforming the outer surface of the end portion of the joint member, With a nut that is high-strength steel that slips inside the
The joint member is connected by inserting the joint ends of the two pipes into both ends of an annular groove that makes the joint ends of the two pipes face each other and communicates and connects the two pipes with each other. A sleeve for holding the sleeve, the annular groove portion is provided on the base side of the sleeve, and fulcrums protruding outward on both sides of the annular groove portion are provided, and the sleeve has a cylindrical shape to be fitted onto a pipe. A step portion is formed on each end side of the inner surface of the annular groove portion so as to project to the inner circumference of the sleeve, and the outer peripheral surface of the sleeve starts from a position toward the end portion by a predetermined distance from the base portion. Is a metal member having a tapered portion whose outer diameter gradually decreases from the base portion toward the end portion, and the collar of the insert member with respect to the inner step portion of the sleeve of the joint member. The parts are attached so that they face each other,
The inner peripheral surface of the nut is a tool for crimping a crimping type pipe joint that is a caulking joint, the inner diameter of which is gradually reduced from one end to the other end from one end to a predetermined distance,
A crimping unit which is installed at the end of the grip type tool body so as to extend and contract so as to extend in a direction intersecting with the grip type tool body, and is attached to the expanding and contracting section of the crimping unit so as to be close to and away from each other and detachable from each other. A first support and a second support,
A stepped portion projecting the nut and the joint member to the inner periphery of the base portion of the sleeve on the outer surface of the joint end portion of the pipe that is inserted into the main body portion of the insert member until the collar portion hits the end surface of the joint end portion. The first support while setting the end of the nut and the fulcrum of the joint member between the ends of the first support and the second support. With the pipe supported by the tool and the second support, the crimping unit is contracted to move the pipe in the axial direction of the pipe while pushing the nut end to fit the outer surface of the joint member to the joint end of the pipe. In a crimping tool for crimping type pipe joints that airtightly joins joint members,
The crimping unit includes a cylinder main body installed in the upper portion of the grip type tool main body so as to extend in the horizontal direction, and a rod portion extending from the cylinder main body in an axially expandable and contractible manner,
Each of the first support tool and the second support tool has a U-shaped first notch and a second notch which are open upward and support a plurality of tubes having different diameters. A plurality of steps are formed so that the inner diameter is gradually expanded from the bottom side of the support tool toward the upper opening, and the end portion of the nut and the nut are formed by the peripheral side surfaces of the first notch and the second notch. The fulcrum portion of the joint member is sandwiched, and the pipe is supported by the plane of the first cutout portion or the second cutout portion ,
The second support includes a second leg that is detachably attached to the tip of the rod, and a second pedestal that is integrally provided on the second leg. The one end portion in the axial direction of the rod portion of, the plurality of second cutouts are formed,
In the second pedestal portion of the second support, a U-shaped second groove having a diameter larger than that of the second cutout portion and a side surface of which is in contact with the end surface of the nut or the fulcrum portion of the joint member is provided. A plurality of steps are formed so that the inner diameter is gradually increased from the bottom side to the open end side of the second support tool so as to be adjacent to the two notches, and the fulcrum of the nut or the joint member is formed by the second concave groove. A crimping tool for crimping type pipe fittings, which supports one of the parts from below . The first support includes a first leg that is detachably attached to the tip of the cylinder body, and a first pedestal that is integrally provided on the first leg. The one end portion in the axial direction of the cylinder body of is formed with the first notch of the plurality of stages,
The first pedestal portion of the first support is provided with a U-shaped first groove having a diameter larger than that of the first cutout portion and a side surface of which is in contact with an end surface of the nut or a fulcrum portion of the joint member. The crimping tool for crimp type pipe joints according to claim 1, wherein a plurality of steps are formed so that the inner diameter is expanded stepwise from the bottom side to the open end side of the first supporting tool so as to be adjacent to the first cutout.

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