JPH09267185A - Gas press welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To immediately execute the punching-shear of a bulging part formed at the joined part of a reinforcing bar with a punching edge without executing a work for releasing the connection of a punching edge supporting body and a movable changing structural body after completing gas press-welding of the reinforcing bar. SOLUTION: In the case of press-welding the reinforcing bars A, B, a second pressing ram 54 is extended in the condition of holding a first pressing ram 53 by supplying pressed working oil into a second hydraulic chamber. The end surface of the reinforcing bar A fixed to the movable clamping structural body 35 is press-welded to the end surface of the reinforcing bar B by transmitting the pressing force from the second pressing ram 54 to the movable clamping structural body 35 and a punching edge holder 41 through driving shafts 32, 33. After completing the gas press-welding, the pressed working oil is supplied to a first hydraulic chamber to extend only the first pressing ram 53 and the punching edge holder 41 is slid in the direction of a fixed clamping structural body 38 and the bulging part at the joined parts of the reinforcing bars A, B is punching-sheared with the punching edge 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas pressure welding machine for press-fitting one reinforcing bar to another reinforcing bar when gas-welding a reinforcing bar, and more particularly to pushing a bulge of a connecting part of the reinforcing bar caused by the gas welding. The present invention relates to a gas pressure welding machine equipped with a punching blade for shearing.

[0002]

2. Description of the Related Art A gas pressure welding machine is widely used for joining reinforcing bars in a construction site such as a building. The gas pressure welding machine uses the gas pressure welding machine to weld one and the other of the rebars to be joined by the gas pressure welding machine. This is one of the methods of joining the reinforcing bars by clamping and pressurizing the end faces in abutting state, and heating the vicinity of the joining part with a gas flame from the ring burner. Further, in such a gas pressure welding machine, Japanese Patent Publication No. 57-9914 or Japanese Patent Publication No. 2-42036
As disclosed in Japanese Patent Laid-Open Publication No. JP-A-2003-264, there is one equipped with a punching blade, and the bulge of the joint portion of the reinforcing bar generated during the gas pressure welding is punched and sheared by the punching blade. This is the Shokoku Sho 63-3
As described in Japanese Patent No. 8099, the surface morphology of the shear plane has a very close correlation with the quality of the joint interface of the base material (rebar), so the strength of the joint of the rebar is guaranteed by a simple visual inspection. This is because it is possible to obtain a great practical advantage.

A gas pressure welding machine having a structure similar to that disclosed in Japanese Patent Publication No. 2-42036 will be described below with reference to the drawings. FIG. 5 is a side sectional view showing an example of the configuration of a conventional gas pressure welding machine, and FIGS. 6, 7 and 8 are
FIG. 6 is a side view, a plan view and a perspective view of the gas pressure welding machine shown in FIG. 5, respectively.

In FIGS. 5 to 8, reference numeral 1 is a bottomed cylinder having one end opened and the other end closed, and a connection holder for connecting the pressure unit 2 to the opening end of the cylinder 1. 3 is screwed on. In the cylinder 1,
The inner cylinder 4 and the outer cylinder 5 are slidably inserted. The inner cylinder 4 is composed of a small diameter portion 4a and a large diameter portion 4b, and the outer peripheral surface of the large diameter portion 4b is in contact with the inner peripheral surface of the cylinder 1. An inner diameter step portion 4c is formed at the boundary between the small diameter portion 4a and the large diameter portion 4b in the inner cylinder 4, and a return spring 6 is provided between the inner diameter step portion 4c and the bottom surface of the cylinder 1. The inner cylinder 4 is mounted on the inner cylinder 4 through the cylinder 1
Is biased in the direction of the opening. The outer cylinder 5 is inserted in the gap between the small diameter portion 4a of the inner cylinder 4 and the inner peripheral surface of the cylinder 1, and is configured to be slidable with respect to the inner cylinder 4 and the cylinder 1. And the pressurizing unit 2 is plural from the outer peripheral surface.
The pins 2b (for example, three pins) are projected, and the pins 2b are fitted into the L-shaped grooves 3a formed in the coupling holder 3 at the time of coupling with the cylinder 1, so that the pins 2b are prevented from falling off. The pressurizing unit 2 held by the connecting holder 3 is a pressurizing ram 2
The a is opposed to the end surface of the small diameter portion 4a of the inner cylinder 4. Also,
Reference numeral 8 denotes a guide slot formed in the cylinder 1 so as to be elongated in the axial direction, and a support leg portion of a movable clamp structure and a support leg portion of a push-out blade holder, which will be described later, move in the guide slot 8.

Reference numeral 9 denotes a movable clamp structure, which is composed of a clamp portion 10 for clamping one rebar A to be gas pressure contacted and a support leg portion 11 supporting the clamp portion 10. The lower end of the support leg 11 is fixed to the outer peripheral surface of the outer cylinder 5, and the clamp 10 is fixed to the upper end of the outer leg 5.
It projects from the cylinder 1 through the guide slot 8. Reference numeral 12 is a guide slot formed in the outer cylinder 5 so as to be elongated in the axial direction, and inside the guide slot 12, a support leg portion of a punching blade holder described later moves. Reference numeral 13 denotes a clamp bolt arranged in the clamp portion 10, and when the reinforcing bar A is clamped, the reinforcing bar A is pressed and fixed to the clamp part 10.

Reference numeral 14 denotes a fixed clamp structure, which is composed of a clamp portion 15 for clamping the other reinforcing bar B which is pressure-contacted with gas, and a support leg portion 16 which supports the clamp portion 15. The lower end of the support leg 16 is fixed to the outer peripheral surface of the cylinder 1, and the clamp 15 is fixed to the upper end. Reference numeral 17 denotes a clamp bolt arranged in the clamp portion 15, and when the reinforcing bar B is clamped, the reinforcing bar B is pressed and fixed to the clamp portion 15.

Numeral 18 is arranged on the same axis between the movable clamp structure 9 and the fixed clamp structure 14, and the reinforcing bars A and B are provided.
It is a punching blade for punching and shearing the bulge formed at the joint portion of the above, and is constituted by a pair of split blades 18a and 18b as shown in FIG. Reference numeral 19 denotes a push-out blade holder which is supported by the inner cylinder 4 in an upright state, and axially supports the split blades 18a and 18b so as to open and close in a double-opening manner with the axes of the reinforcing bars A and B as boundaries. The split blades 18a, 18b axially supported by the punching blade holder 19 which is a pusher blade supporting member are moved to the push-out releasing position shown by the solid line in FIG. Open and close. In addition, the support leg 20 of the punching blade holder 19
Has its lower end fixed to the outer peripheral surface of the small diameter portion 4a of the inner cylinder 4, and protrudes from the cylinder 1 through the guide slot 8 of the cylinder 1 and the guide slot 12 of the outer cylinder 5.

One end of a pair of connecting rods 21 is fixed to both side surfaces of the supporting leg portion 20, and the connecting rods 21 are connected to each other.
Extend rearward along both sides of the support leg 11 and
A coupling joint portion 21a is formed in a portion that extends further rearward from. Further, a key holding pedestal 22 protruding rearward is integrally formed with the support leg portion 11 of the movable clamp structure 9, and a key holding block 23 is fastened and fixed to the upper surface of the key holding pedestal 22 by a bolt 24. . Where the key holding pedestal
A spring accommodating hole 22a for accommodating the push-up spring 25 is formed in 22 and a key holding block 23 has a cross-shaped connecting key which is communicated with the spring accommodating hole 22a and is opened on both side surfaces of the key holding block 23. An operating hole 23a is provided. The connecting key 26 is housed in the connecting key operating hole 23a so as to be vertically movable, and both ends of the connecting key 26 project laterally from the connecting key operating hole 23a. The push-up spring 25 housed in the spring housing hole 22a constantly urges the connecting key 26 housed in the connecting key operating hole 23a upward.

When the push-out blade holder 19 and the movable clamp structure 9 are connected by the connecting mechanism configured as described above, the operator brings the push-out blade holder 19 into close contact with the movable clamp structure 9. After that, the connecting key 26 is pushed down against the urging force of the push-up spring 25, and both ends of the connecting key 26 are fitted into the key holes 21b formed on the upper surface of the connecting joint portion 21a. In this state, only the both ends of the connecting key 26 are fitted into the key hole 21b, and the other parts are housed in the spring housing hole 22a and the connecting key operating hole 23a, so that the pressing unit 2 is operated. Then, the inner cylinder 4 is pressed by the ram 2a with a predetermined pressing force, so that pressure contact forces in opposite directions act on both end portions of the connecting key 26 and other portions. The connection key 26 is held in a state of being fitted into the key hole 21b against the force of the push-up spring 25 by the pressure contact force, and maintains the connection state between the push-out blade holder 19 and the movable clamp structure 9.

When releasing the connection between the push-out blade holder 19 and the movable clamp structure 9, the operation of the pressure unit 2 is stopped and the pressure applied by the ram 2a is released, whereby the connection key 26 The press-contact force acting on is removed and the push-up spring 25 flips up the connection key 26, and the connection between the push-out blade holder 19 and the movable clamp structure 9 is released. In the state where this connection is released, the pressurizing unit 2 is operated to pressurize the inner cylinder 4 by the ram 2a, so that only the punching blade holder 19 and the inner cylinder 4 are fixed in the clamp structure 14.
Will move in the direction of.

Next, the operation of gas pressure welding in the conventional gas pressure welding machine configured as described above will be described.
First, after opening the split blades 18a and 18b to the push-out releasing position, the reinforcing bar A is clamped to the clamp portion 10 of the movable clamp structure 9 by the clamp bolts 13, and the fixed clamp structure 14 is further attached.
Reinforcing bar B is clamped to the clamp portion 15 by a clamp bolt 17, and the end surface of reinforcing bar A and the end surface of reinforcing bar B, which are joint surfaces, are abutted against each other. In this state, the split blades 18a and 18b pivotally supported by the push-out blade holder 19 are closed at the push-out position to complete the work of setting the reinforcing bars A and B in the gas pressure welding machine.

When the reinforcing bars A and B set in the gas pressure welding machine are to be pressed, as described above, the pressurizing unit 2 is operated after the connecting key 26 is inserted into the key hole 21b of the connecting joint portion 21a. By pressing the inner cylinder 4 with the ram 2a, the connection state between the movable clamp structure 9 and the punching blade holder 19 is maintained. Further, by continuing the operation of the pressurizing unit 2, the pressing force from the ram 2a is transmitted to the push-out blade holder 19 and the movable clamp structure 9 connected thereto through the inner cylinder 4. As a result, the end surface of the reinforcing bar A fixed to the movable clamp structure 9 comes into pressure contact with the end surface of the reinforcing bar B fixed to the fixed clamp structure 14 by the pressing force of the ram 2a. After that, the vicinity of the boundary between the reinforcing bars A and B, which is the joint, is heated to a predetermined temperature by a gas flame from a ring burner (not shown) to reduce the deformation resistance of the joint between the reinforcing bars A and B. By continuing the pressurization, the end faces are firmly bonded by the atomic diffusion between the reinforcing bars A and B while forming a bulge in the radial direction at the bonded portion.

When the pressurization by the pressurizing unit 2 is temporarily stopped after the gas pressure contact is completed, the pressure contact force holding the connecting key 26 in the key hole 21b disappears and the connecting key 26 pushes up the spring 25.
By this, it is flipped upward, and the connection between the push-out blade holder 19 and the movable clamp structure 9 is released. In this state, the pressurizing unit 2 is operated again and the inner cylinder 4 is moved by the ram 2a.
By pressurizing, the inner cylinder 4 slides against the return spring 6, and only the punching blade holder 19 is moved toward the fixed clamp structure 14. At this time, the punching blade 18 supported by the punching blade holder 19 punches and shears the bulge at the joint between the reinforcing bars A and B.

After the completion of the push-out shearing, the split blades 18a and 18b are opened to the push-out releasing position, the clamp bolts 13 and 17 are loosened, and the rebars A and B clamped by the clamp portions 10 and 15 are released. Then, by contracting the ram 2a of the pressure unit 2, the inner cylinder 4 slides together with the outer cylinder 5 in the direction away from the fixed clamp structure 14 by the restoring force of the return spring 6, and the punching blade The holder 19 and the movable clamp structure 9 are returned to the initial position shown in FIG.

[0015]

However, during gas pressure welding, the entire gas pressure welding machine is heated to a high temperature over time due to heat conduction from the reinforcing bars A and B and radiant heat from the gas flame. When heated to such a high temperature,
Creep that occurs in a member that receives pressure from the pressure unit 2 becomes a problem. In particular, since the connecting key 26 receives a force substantially equal to the pressure contact force to the reinforcing bars A and B at both ends thereof, the bending is likely to occur due to creep, and further the thermal expansion reduces the clearance in the connecting key operating hole 23a. This makes it difficult to smoothly move up and down in the connecting key operating hole 23a when a certain amount of creep deformation occurs.

Further, the inner cylinder 4 has a reinforcing bar A,
Since a moment corresponding to the distance to the shaft center of B acts, creep deformation that tends to bend with respect to the shaft center easily occurs. When the inner cylinder 4 bends with respect to the shaft center, the inner cylinder 4 The push-out blade holder 19 supported by is tilted together with the connecting rod 21, and at that time, the key hole formed at the end of the connecting rod 21.
Since the connecting key 26 is fitted into the 21b, even if the pressurization by the pressing unit 2 is stopped, the pressure contact force generated by the tilting of the connecting rod 21 acts on the end of the connecting key 26. become.

As described above, since the connecting key 26 and the inner cylinder 4 creep-deform during gas pressure contact, it becomes difficult for the connecting key 26 to move up and down in the connecting key operating hole 23a, and at the same time, the connecting key 26 Since the pressure contact force generated by the tilting of the connecting rods 21 acts on both ends of the push-up spring, even if the pressurizing unit 2 is stopped after the gas pressure contact is completed and the pressure applied by the ram 2a is eliminated. Due to the repulsive force of 25, the connecting key 26 inserted into the key hole 21b cannot be flipped up to the position where it is released from the key hole 21b, and the connection between the push-out blade holder 19 and the movable clamp structure 9 cannot be released. May be.

When the connection between the push-out blade holder 19 and the movable clamp structure 9 cannot be released due to the above reasons, the connecting key 26 is given a shock by being hit by a tool or the like, so that the connecting key 26 is opened in the key hole. 21b, or by loosening the clamp bolt 13 once, the connecting key 26 and the key hole 21
It has been performed to facilitate the vertical movement of the connecting key 26 by creating a play between the connecting key 26 and b. However, the impact on the connecting key 26 does not affect the connecting key 26 and the connecting rod 21.
When the device life or parts life is shortened remarkably by deforming etc. and the clamp bolt 13 is once loosened, the rebar A must be re-clamped after the connecting key 26 is detached from the key hole 21b. This will extend the work time for and hinder efficient work.

In order to solve the above-mentioned problems, an object of the present invention is to carry out a pushing operation without releasing the connection between the punching blade support body and the movable clamp structure once the gas pressure welding of the reinforcing bar is completed. It is an object of the present invention to provide a gas pressure welding machine capable of immediately punching and shearing a bulge formed at a joint of reinforcing bars by a punching blade.

[0020]

In order to solve the above-mentioned problems, the gas pressure welding machine according to claim 1 of the present invention should be pressure-welded with a movable clamp structure for clamping one rebar to be pressure-welded. A fixed clamp structure for clamping the other reinforcing bar, and a punching blade disposed between the movable clamp structure and the fixed clamp structure for shearing the bulge at the joint between the one reinforcing bar and the other reinforcing bar. And a cylindrical support cylinder that supports the fixed clamp structure in an upright state and protrudes from the cylinder outer peripheral surface, and is slidably inserted into the support cylinder. A first drive shaft that supports the punching blade support in an upright state and projects the punching blade support from the outer peripheral surface of the cylinder through a guide slot formed in the support cylinder, and the first drive shaft. A small diameter portion formed at one end of the shaft and the supporting cylinder so as to be slidably inserted, the movable clamp structure being supported in an upright state, and protruding from the outer peripheral surface of the cylinder through the guide slot. A second drive shaft, a first pressure ram having a cross-sectional shape corresponding to the small diameter portion of the first drive shaft, and a second pressure ram having a cross-sectional shape corresponding to the second drive shaft. , A slidably housed in a single pressurizing cylinder and removably attached to one end of the support cylinder so that the end surfaces of the first pressurizing ram and the second pressurizing ram are respectively reduced in diameter. And a pressurizing means opposed to the end surface of the second drive shaft, and when one rebar and the other rebar are pressed against each other, the second drive shaft is moved by the second pressurizing ram. Pressurize and drive the second When sliding the first drive shaft together with the shaft in the direction of the fixed clamp structure and shearing the bulge of the joint between one rebar and the other rebar, the first pressure ram is used to It is characterized in that the first drive shaft is pressurized and only the first drive shaft is slid toward the fixed clamp structure.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a part of a gas pressure welding machine according to an embodiment of the present invention as a fractured surface, FIG. 2 is a side view of a pressure unit in the gas pressure welding machine of the present embodiment, and FIGS. The members corresponding to the members described on the basis of FIG.

In FIG. 1, reference numeral 31 is a bottomed support cylinder whose one end is open and the other end is closed by a bottom plate 31a. A pressure unit, which will be described later, is connected to the open end of this support cylinder 31. The connection holder 3 for this is screwed. 32 is the first which is slidably inserted in the support cylinder 31.
The first drive shaft 32 is a drive shaft, and the first drive shaft 32 has a large diameter portion 32a having an outer diameter slightly smaller than the inner diameter of the support cylinder 31.
And a small diameter portion 32b having an outer diameter smaller than that of the large diameter portion 32a. A spring accommodating hole 32c is formed in the large-diameter portion 32a along the axis thereof, and the spring accommodating hole 32c is opened at the tip surface of the support cylinder 31. Reference numeral 33 denotes a cylindrical second drive shaft, and the second drive shaft 33 is provided in the gap between the outer peripheral surface of the small diameter portion 32b formed at one end of the support cylinder 31 and the inner peripheral surface of the support cylinder 31. Inserted, small diameter part 32b and support cylinder 3
Each of them is slidable with respect to 1. 34 is
The one end side is a return spring which is inserted into the spring accommodation hole 32c in a telescopic manner and is compressed by the bottom surface of the spring accommodation hole 32c and the bottom plate 31a. Is urged to.

Reference numeral 35 denotes a movable clamp structure, which is composed of a clamp portion 36 for clamping one rebar A which is pressure-contacted with gas, and a support leg portion 37 supporting the clamp portion 36. The lower end of the support leg portion 37 is fixed to the outer peripheral surface of the second drive shaft 33 in the support cylinder 31, and the clamp portion 36 is fixed to the upper end thereof. Guide slots
It projects from the support cylinder 31 through 31b. 38 is a fixed clamp structure, and the other reinforcing bar B is gas pressure welded.
And a support leg 40 that supports the clamp portion 39. Support leg 40
The lower end is fixed to the outer peripheral surface of the support cylinder 31, and the clamp part 39 is fixed to the upper end.

Reference numeral 41 denotes a punching blade holder 41 arranged between the movable clamp structure 35 and the fixed clamp structure 38,
The punching blade holder 41 axially rotatably supports the punching blade 18 formed of a pair of split blades, and supports the punching blade 18 on the same axis as the movable clamp structure 35 and the fixed clamp structure 38. There is. Further, the support leg portion 42 forming the lower end portion of the punching blade holder 41 has its lower end fixed to the outer peripheral surface of the first drive shaft 32 in the support cylinder 31, and protrudes from the support cylinder 31 through the guide slot 31b. ing.

In FIGS. 1 and 2, 50 is a support cylinder.
A pressing unit removably connected to 31 via the connection holder 3, 51 is a pressing cylinder, and the pressing cylinder 51 projects a plurality of (for example, three) pins 51a from the outer peripheral surface to support the cylinder 31. When connecting with the pin 51a, as shown in FIG.
By being inserted into the L-shaped groove 3a formed in the connection holder 3, the falling is prevented. 52 is a nipple socket fixed to the outer peripheral surface of the pressurizing cylinder 51.
One end of 52a communicates with a hydraulic passage 51b formed in the pressure cylinder 51. Reference numerals 53 and 54 respectively denote a first pressure ram and a second pressure ram housed in the pressure cylinder 51. Here, the first pressure ram 53 is the small diameter portion 32 of the first drive shaft 32.
It has a cross-sectional shape that is substantially the same as the end surface of b, and is slidably inserted in a second pressure ram 54 formed in a cylindrical shape. The second pressure ram 54 has substantially the same sectional shape as the end surface of the second drive shaft 33, and is slidably inserted into the pressure cylinder 51.

55 is fixed in the pressurizing cylinder 51 to seal the gap between the rear end opening of the pressurizing cylinder 51 and the outer peripheral surface of the second pressurizing ram 54 in a liquid-tight state and to pressurize the pressurizing cylinder 51. It is a ring-shaped sealing member that forms a second hydraulic chamber 56 together with the inner peripheral surface of the second pressurizing ram 54 and the outer peripheral surface of the second pressure ram 54. The second hydraulic chamber 56
Communicates with the screw hole 52a of the nipple socket 52 via the hydraulic passage 51b of the pressure cylinder 51. 57 is a pressure cylinder 5
The return spring is arranged between the inner peripheral surface of 1 and the outer peripheral surface of the second pressure ram 54 and always biases the second pressure ram 54 in the contracting direction.

Reference numeral 58 is a tubular sealing member fitted in the rear end opening of the second pressure ram 54, 59 is a pipe-shaped connecting member fitted in the through hole 58a of the sealing member 58, and 60 is The nipple socket is fixed to the rear end of the second pressure ram 54 by a bag-shaped nut 61 screwed to the rear end of the sealing member 58. A pipe-shaped insertion portion 60a that is inserted into the through hole 58a of the sealing member 58 while being fixed to the end is formed. On the other hand, in the second pressure ram 54,
A first hydraulic chamber 62 is formed by the inner surfaces of the sealing member 58, the second pressure ram 54, and the first pressure ram 53, and one end of the screw hole 60b of the nipple socket 60 has an insertion portion 60a and a seal. Member 58
It communicates with the first hydraulic chamber 62 through the through hole 58a and the connecting member 59. Further, 63 is a connecting bolt screwed to the bottom of a hollow hole opened at the rear end surface of the first pressure ram 53, 64 is one end of which is hooked by a connecting member 59 in the first hydraulic chamber 62, and The end portion is a return spring supported by a connecting bolt 63, and the return spring 64 constantly urges the first pressure ram 53 in the contracting direction.

When the pressure unit 50 constructed as described above is operated, as shown in FIG. 1, the nipple 64a is screwed into the screw hole 60b to connect the hydraulic hose 65 to the nipple socket 60, Further, the nipple 66a is screwed into the screw hole 52a to connect the hydraulic hose 66 to the nipple socket 52. The hydraulic hoses 65 and 66 are connected to a hydraulic oil supply unit (not shown) equipped with a hydraulic pump and the like, and by operating the hydraulic oil supply unit, the hydraulic hose 65 or the hydraulic hose 66 is operated in a predetermined manner. The hydraulic oil pressurized to the pressures p ₁ and p ₂ is supplied. At this time, when the hydraulic oil having the working pressure p ₁ is supplied to the hydraulic hose 65 by the hydraulic oil supply unit,
Hydraulic oil of the hydraulic pressure p ₁ is filled in the first hydraulic chamber 62, hydraulic pressure p ₁ is by acting on the first hydraulic chamber 62, only the first pressure ram 53 is extended against the return spring 64 . Also,
By releasing the working oil having the working pressure p ₁ to the oil tank or the like in the working oil supply unit, the hydraulic pressure from the working oil acting on the first hydraulic chamber 62 decreases, and the first pressure ram 53 causes the return spring 64 to move. It contracts due to the urging force and returns to the position shown in FIG.

Further, in the case of supplying the hydraulic oil of the hydraulic pressure p ₂ in the hydraulic hoses 66 by hydraulic oil supply unit, hydraulic oil of the hydraulic pressure p ₂ is filled in the second hydraulic chamber 56, the working pressure p ₂ By acting on the second hydraulic chamber 56, the second pressure ram 54
However, it extends against the return spring 57 with the first pressure ram 53 held inside. That is, the second pressure ram 54 extends with respect to the pressure cylinder 51 together with the first pressure ram 53, and the first pressure ram 53 is held at a fixed position with respect to the second pressure ram 54. Will be. Further, by releasing the working oil having the working pressure p ₂ to the oil tank or the like in the working oil supply unit, the hydraulic pressure from the working oil acting on the second hydraulic chamber 56 decreases, and the second pressurizing ram 54 causes the return spring to return. It is contracted by the urging force of 57 and returns to the position shown in FIG. 1 together with the first pressure ram 53.

Next, the operation of gas pressure welding in the gas pressure welding machine of the present embodiment having the above-described structure will be described. 3 and 4 are side views for explaining the operation of the gas pressure welding machine of the present embodiment. First, after opening the push-out blade 18 composed of a pair of split blades to the push-out release position, the reinforcing bar A is clamped to the clamp portion 36 of the movable clamp structure 35 by the clamp bolts 13, and the fixed clamp structure 38 is further provided.
The reinforcing bar B is clamped to the clamp portion 39 by the clamp bolt 17, and the end surface of the reinforcing bar A and the end surface of the reinforcing bar B, which are joint surfaces, are abutted against each other. In this state, by closing the punching blade 18 pivotally supported by the punching blade holder 41 to the punching position, the work of setting the reinforcing bars A and B in the gas pressure welding machine is completed.

When the reinforcing bars A and B set in the gas pressure welding machine are to be pressure-welded, the working oil having the working pressure p ₂ is supplied to the second hydraulic chamber 56 by the working oil supply unit via the hydraulic hose 66. As a result, as described above, the second pressure ram 54
However, with the first pressure ram 53 held, the return spring 57
The first pressure ram 53 and the second pressure ram 54
Are the first drive shaft 32 and the second drive shaft, respectively.
Press on 33. Further, the operating pressure p for the second hydraulic chamber 56
By continuing the supply of the _second hydraulic fluid, a second pressure ram 5
The pressing force from 4 is transmitted to the movable clamp structure 35 and the punching blade holder 41 via the first drive shaft 32 and the second drive shaft 33, and the end surface of the reinforcing bar A fixed to the movable clamp structure 35 is , Is pressed against the end surface of the reinforcing bar B fixed to the fixed clamp structure 38 by the pressing force from the second pressure ram 54. After that, the vicinity of the boundary between the reinforcing bars A and B, which is the joint, is heated to a predetermined temperature by a gas flame from a ring burner (not shown) to reduce the deformation resistance of the joint between the reinforcing bars A and B. By continuing the pressurization, as shown in FIG. 3, the movable clamp structure 35 and the punching blade holder 41 integrally move forward in the direction of the fixed clamp structure 38, and a radial bulge is formed in the joint. While being formed, the end faces are firmly joined by the atomic diffusion between the reinforcing bars A and B.

After the gas pressure contact is completed, while the supply of the working oil having the working pressure p ₂ to the second hydraulic chamber 56 is maintained, the working oil having the working pressure p ₁ is further supplied through the hydraulic hose 65 to the first hydraulic chamber 62.
Supply to the first pressure ram 53 as described above.
Only extends against the return spring 64, moving only the first drive shaft 32 and the punching blade holder 41 in the direction of the fixed clamp structure 38, as shown in FIG. At this time, the punching blade 18 supported by the punching blade holder 41 pushes and shears the bulge S at the joint between the reinforcing bars A and B.

After the completion of the push-out shearing, the push-out blade 18 is opened to the push-out release position, and the clamp bolts 13 and 17 are loosened to release the clamp portion 3.
Release the reinforcing bars A and B that were clamped by 6 and 39. Then, in the hydraulic oil supply unit, the operating pressure p ₁ ,
By releasing the p ₂ hydraulic oil to the oil tanks or the like, the first pressure ram 53 and the second pressure ram 54 are contracted by the urging force of the return springs 64 and 57 and returned to the position shown in FIG.

As described above, according to the gas pressure welding machine of the present embodiment, like the conventional gas pressure welding machine described with reference to FIGS. 5 to 8, the movable clamp structure 35 and the punching blade holder 41 are provided. Since a connecting mechanism for connecting / disconnecting and is unnecessary, the movable clamp structure is formed after the gas pressure welding is completed by the plastic deformation of the connecting key, the connecting rod and the members supporting them, which constitute the connecting mechanism. The pressing unit does not become irreversible when the body 35 and the punching blade holder 41 are not released.
Since the operation of 50 is once stopped and the punching shearing can be immediately performed by the pressing force from the first pressing ram 53 without interrupting the pressing by the second pressing ram 54, the movable clamp structure 35 It is possible to prevent the life of the device or parts from being shortened due to damage to the connecting mechanism between the punching blade holder 41 and the punching blade holder 41, and to shorten the time from the end of gas pressure welding to the start of punching shearing for efficient work. It becomes possible to execute.

Further, in the pressurizing unit 50 of this embodiment, two nipple sockets 6 are provided in order to supply the hydraulic oil to the first hydraulic chamber 62 and the second hydraulic chamber 56 independently of each other.
0, 52 are arranged, and two hydraulic hoses 65, 66 make it possible to supply hydraulic oils of different operating pressures p ₁ , p ₂ to the first hydraulic chamber 62 and the second hydraulic chamber 56, respectively. There is.
However, in such a configuration, two hydraulic hoses
It is necessary to connect 65 and 66 to the pressurizing unit 50 respectively, and since two hydraulic hoses 65 and 66 project from the pressurizing unit 50 during gas pressure contact, it may be added depending on the work place where the gas pressure contact is performed. Workability in connecting the pressure unit 50 to the support cylinder 31 may be poor. Therefore, only one nipple socket is arranged in the pressurizing unit 50, and the pressurizing unit 50 is provided with a switching valve for switching the supply destination of the hydraulic oil supplied from one hydraulic hose connected to the nipple socket. It may be provided.

That is, when the reinforcing bars A and B are pressure-welded to each other, the hydraulic oil supplied from the hydraulic hose by the switching valve is supplied only to the second hydraulic chamber 56, and thereafter, the joint between the reinforcing bars A and B is supplied. When push-shearing the bulge, the switching valve closes the second hydraulic chamber 56 so that the working pressure of the hydraulic oil in the second hydraulic chamber 56 is maintained, and the hydraulic oil supplied from the hydraulic hose is used. Is switched to the first hydraulic chamber 62. When the pressure contact between the reinforcing bars A and B is completed, the switching valve causes the first hydraulic chamber 62 and the second hydraulic chamber 56 to communicate with the hydraulic hose to release the hydraulic oil. As described above, when the pressurizing unit 50 is provided with the switching valve for switching the hydraulic oil, since the hydraulic oil is supplied to the hydraulic chambers 62 and 56 from one hydraulic hose, the first hydraulic hose is always operated at a constant operating pressure. 1 pressure ram 53 and 2nd
In order that each pressurizing ram 54 generates a predetermined pressing force,
First pressure ram 53 and second pressure ram in the hydraulic chambers 62 and 56
It is necessary to set the pressure receiving area of each 54 appropriately.

[0037]

As described above, according to the gas pressure welding machine according to the first aspect of the present invention, when the one reinforcing bar and the other reinforcing bar are pressed together, the second drive shaft is driven by the second pressurizing ram. To slide the first drive shaft together with the second drive shaft in the direction of the fixed clamp structure to shear the bulge at the joint between one rebar and the other rebar,
By pressing the first drive shaft by the first pressure ram and sliding only the first drive shaft in the direction of the fixed clamp structure, the movable clamp structure and the punching blade support are directly connected to each other. Since the connecting mechanism for connecting / disconnecting to and from the movable clamp structure can be eliminated, the movable clamp structure and the pressing member are pushed after the gas pressure welding is completed due to plastic deformation of the members forming the connecting mechanism and the members supporting them. Immediately from the first pressure ram, the connection with the extraction blade support cannot be released, and the operation of the pressure means is temporarily stopped to interrupt the pressure applied by the second pressure ram. Since the punching shearing can be executed by the pressing force, it is possible to prevent the life of the device or the parts from being shortened due to the damage of the connecting mechanism between the movable clamp structure and the punching blade holder support, and to prevent the gas pressure contact. End It is possible to perform efficient operation by shortening the time until the start of Luo punching shear.

[Brief description of drawings]

FIG. 1 is a side view in which a part of a gas pressure welding machine according to an embodiment of the present invention is a fracture surface.

FIG. 2 is a side sectional view of a pressurizing unit in the gas pressure welding machine according to the embodiment of the present invention.

FIG. 3 is a side view for explaining the operation of the gas pressure welding machine according to the embodiment of the present invention.

FIG. 4 is a side view for explaining the operation of the gas pressure welding machine according to the embodiment of the present invention.

FIG. 5 is a side sectional view showing an example of the configuration of a conventional gas pressure welding machine.

FIG. 6 is a side view of the gas pressure welding machine shown in FIG. 5.

FIG. 7 is a plan view of the gas pressure welding machine shown in FIG.

FIG. 8 is a perspective view of the gas pressure welding machine shown in FIG.

[Explanation of symbols]

18 ... Punching blade, 31 ... Support cylinder, 32 ... First drive shaft, 32a ... Large diameter part, 32b ... Small diameter part, 33 ... Second drive shaft, 35 ... Movable clamp structure, 38 ... Fixed clamp structure, 50 ... Pressure unit, 51 ... Pressure cylinder,
53 ... 1st pressure ram, 54 ... 2nd pressure ram, A, B ...
Rebar.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Oishibashi 2-8, Hikarimachi, Kokubunji, Tokyo 38 Inside the Railway Technical Research Institute (72) Inventor, Katsuyoshi Ueyama 2-chome, Kokubunji, Tokyo 8th 38 Inside the Railway Technical Research Institute (72) Inventor Kazuo Hosokawa 1-39-7 Sangenjaya Sangenjaya, Setagaya-ku, Tokyo

Claims (1)

[Claims] 1. A movable clamp structure for clamping one rebar to be crimped, a fixed clamp structure for clamping the other rebar to be crimped, and an arrangement between the movable clamp structure and the fixed clamp structure. A push-out blade support body that supports a push-out blade for shearing the bulge of the joint between one rebar and the other, and the fixed clamp structure is supported in an upright state and protruded from the cylinder outer peripheral surface. A cylindrical support cylinder, slidably inserted into the support cylinder, supporting the punching blade support in an upright state, and passing the punching blade support through a guide slot formed in the support cylinder. A first drive shaft projecting from the outer peripheral surface of the cylinder, and a slidable insertion into a gap between the support cylinder and a small diameter portion formed at one end of the first drive shaft. A second drive shaft that supports the movable clamp structure in an upright state and projects from the cylinder outer peripheral surface through the guide slot; and a first drive shaft having a cross-sectional shape corresponding to a small diameter portion of the first drive shaft. A pressure ram and a second pressure ram having a cross-sectional shape corresponding to the second drive shaft are slidably housed in a single pressure cylinder and can be attached to and detached from one end of the support cylinder. When mounted, the end surfaces of the first pressure ram and the second pressure ram are respectively attached to the small diameter portion and the second pressure ram.
Pressing means facing the end face of the drive shaft of the second driving shaft, when the pressing means press-contacts one rebar and the other rebar, the second drive ram drives the second drive ram. When pressing the shaft to slide the first drive shaft together with the second drive shaft in the direction of the fixed clamp structure, and shearing the bulge of the joint between one rebar and the other rebar, A gas pressure welding machine, characterized in that the first drive shaft is pressurized by the first pressure ram and only the first drive shaft is slid toward the fixed clamp structure.