JPH0451032Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gas pressure welding device used when joining reinforcing bars by a gas pressure welding method.

[Prior Art] Gas pressure welders for reinforcing bars that have been commonly used in the past have one fixed clamp part provided on the side of the tip of the pressure welder main body, which is a cylinder, and the other movable clamp part slides inside the pressure welder main body. The movable slider is provided protruding from the side surface and is movable along an elongated hole provided in the circumferential wall of the pressure welding device body, facing the fixed clamp part. After the reinforcing bars to be joined to both clamp parts are centered and gripped, a slider is pushed by a hydraulic cylinder that is detachably connected to the pressure welding device body, and the reinforcing bars gripped by the movable clamp part are moved. The reinforcing bars gripped by the fixed clamp are pressurized with the required force, and then the contact area of both reinforcing bars is heated and heated with a torch.
The bonding is completed by softening and diffusion of the contact area.

By the way, such gas pressure welding work of reinforcing bars is generally carried out at construction sites, and in order to improve work efficiency, it is necessary to join as many reinforcing bars as possible in a short time. Therefore, the pressure welding device body and the hydraulic cylinder are configured to be detachable in a one-touch manner, so that the hydraulic cylinder can be shared by a large number of pressure welding device bodies. However, when the hydraulic cylinder is removed from the pressure welder body after joining one reinforcing bar and starting to join the next reinforcing bar, if it is removed before the joint has spread sufficiently, the joining will be interrupted. As a result, the quality of the joint is impaired, such as a decrease in the strength of the joint, resulting in defective joints. In order for the reinforcing steel joints to spread sufficiently, it is necessary to apply a specified pressure force and maintain that state for at least one minute. It is easy to make a mistake in releasing the pressure force.

[Problems to be solved by the invention] Conventional reinforcing steel gas pressure welders are configured as described above, so after the hydraulic cylinder is removed, there is no means to maintain the pressure welding force, and as a result, the reinforcing steel joints are damaged. There were problems such as insufficient strength.

The object of the present invention is to obtain a reinforcing steel gas pressure welding device that is improved in order to solve the conventional problems as described above.

[Means for Solving the Problems] The reinforcing steel gas pressure welding device according to the present invention has the following features to maintain the pressure welding force during reinforcing steel welding between the movable clamp part and the pressure welding device body in the conventional reinforcing steel gas pressure welding device. ,
A locking means is provided to prevent the movable clamp portion from retreating due to the pressure contact force.

This pressure holding means is, for example, a ratchet type, a lock pin type, or the like.

[Function] In the reinforcing steel gas pressure welding device according to the present invention, the movable clamp part is pushed by a hydraulic cylinder when reinforcing steel is pressure welded, but since a pressure holding means is provided, when the hydraulic cylinder is immediately removed. However, the pressure contact force can be maintained, and the reinforcing bar joints can be sufficiently spread.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is an enlarged sectional view along the line of Fig. 1, and Fig. 3 is an enlarged sectional view of the embodiment of the present invention.
A cross-sectional view of the line, FIG. 4 is a side view of FIG.
In these figures, reference numeral 1 denotes a pressure welding device body, and a fixed clamp portion 2 for gripping one of the reinforcing bars A is fixed to the distal end side portion of the cylinder 11 via a connecting plate 21. A movable clamp part 3 that faces the fixed clamp part 2 and grips the other reinforcing bar B is attached to the cylinder 11 so as to be movable in parallel to the reinforcing bar axis. That is, the movable clamp part 3 has a connecting plate 31 on the side surface of the slider 12 that slides inside the cylinder 11.
It protrudes through the cylinder 11 and can move along a long hole 13 provided in the peripheral wall of the cylinder 11. Also,
A return spring (not shown) for the slider 12 is built inside the cylinder 11 . Furthermore, the hydraulic cylinder 4 can be detachably attached to the base end of the cylinder 11, and a bayonet-type locking groove 14 is provided in which a plurality of protrusions 41 protruding from the hydraulic cylinder 4 engage. ing. The slider 12 of the movable clamp part 3 is pushed by the ram 5 of the hydraulic cylinder 4 mounted in this way, and is gripped by the movable clamp part 3 against the reinforcing bar A gripped by the fixed clamp part 2. The reinforced reinforcing bar B is pressed with a predetermined pressure force. Reference numeral 6 indicates an adjustment bolt for adjusting the center of the reinforcing bar welding of the movable clamp part 3. Reference numeral 7 indicates a fixing bolt that is screwed into each clamp part 2, 3. It is tightened and fixed between the uneven parts 22 and 32 formed on the support part. Note that the tip of the fixing bolt 7 is formed into a circular edge portion 71, and is adapted to grip the reinforcing bars A and B under a so-called notch action.

Therefore, a locking means 8 is interposed between the movable clamp part 3 and the pressure welding device main body 1 for holding both reinforcing bars in the movable clamp part 3 under the above-mentioned pressure contact force. This locking means 8 is of a ratchet type, for example, and is configured to lock a pawl 82 provided on the pressure welding device main body 1 to a ratchet 81 carved in the connecting plate 31 of the movable clamp section 3. . That is, the ratchet 81 is provided with teeth 81a that are inclined rearward with respect to the forward direction a of the movable clamp portion 3 at predetermined intervals across the entire width of the connecting plate 31, and the claws 82 automatically engage the teeth 81a. The distal end 82a is inclined along the inclination of the tooth 81a so as to be engaged, and is attached to the attachment member 84 by being pressurized by a spring 83. The mounting member 84 is fixed to the cylinder 11 by welding or the like. Claw 8
2 is unlocked by pulling up the knob 85. 86 is the claw 82 via the spring 83.
This is a cap for attaching the to the attachment member 84.

Next, the operation of the gas pressure welding device configured as described above will be explained.

One of the reinforcing bars A is screwed into the fixed clamp part 2 with a fixing bolt 7 to be tightened and fixed, and the other reinforcing bar B is similarly screwed into the movable clamp part 3 with a fixing bolt 7 and tightened to be fixed. After aligning the centers of both reinforcing bars A and B, the hydraulic cylinder 4 attached to the cylinder 11 is operated, and its ram 5 pushes the slider 12 to press the reinforcing bars A and B with a predetermined pressing force.

Next, while applying the pressure welding force, the contact portion C between the reinforcing bars A and B is heated and softened using a torch (not shown), and the contact portion C is enlarged to a predetermined outer diameter and then joined. At this time, as the movable clamp part 3 moves forward, the claw 82 on the pressure welding device main body 1 side
The teeth 81a of the side ratchets 81 and the springs 83 automatically engage in sequence. Therefore, even if the hydraulic cylinder 4 is immediately removed from the pressure welding device main body 1 when joining the reinforcing bars, the movable clamp portion 3 will not retreat due to the engagement between the ratchet 81 and the pawl 82, so that the pressure welding force can be reduced. It is held as it is, and the subsequent diffusion of the reinforcing bar joints is sufficiently performed. Therefore, defects such as a decrease in the joint strength of reinforcing bars and poor joints do not occur. Moreover, the hydraulic cylinder 4 can be immediately removed and used for the next gas pressure welding device.

Next, FIG. 5 shows another embodiment, in which the locking means 8 is of a lock pin type. FIG. 6 is a sectional view taken along the line of FIG. 5.

In this embodiment, the slider 1 of the movable clamp part 3 is
The pin 17 is inserted at a position where the hole 15 provided in the cylinder 2 matches one of the plurality of holes 16 provided in the cylinder 11.
The operation and effect are the same as in the above embodiment.

[Effects of the invention] As described above, according to the invention, a means for maintaining the pressure welding force during pressure welding of reinforcing steel is interposed between the movable clamp part and the pressure welding device body, so that the common hydraulic cylinder can be immediately connected Even when removed from the pressure welding device body, the pressure welding force is not lost, and the reinforcing bar joint can be sufficiently diffused, and defects such as a decrease in joint strength and poor jointing do not occur. Further, since the quality of the reinforcing bar joint is maintained safely in this manner, the hydraulic cylinder can be immediately used for another pressure welding device main body, so the pressure welding work can be performed quickly.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is an enlarged sectional view along the line of Fig. 1, and Fig. 3 is an enlarged sectional view of the embodiment of the present invention.
4 is a side view of FIG. 1, FIG. 5 is a partially cutaway front view of another embodiment, and FIG. 6 is a side view of FIG.
FIG. 1... Pressure welding device body, 2... Fixed clamp part, 3
...Movable clamp part, 8...Locking means.

Claims (1)

[Scope of utility model registration request] In a gas pressure welding device for reinforcing bars that is attached to a pressure welding device main body that grips reinforcing bars to be joined by gas pressure welding, one clamp part is fixed and the other clamp part is movable parallel to the reinforcing bar axis. A gas pressure welding device for reinforcing bars, characterized in that a locking means is provided between the clamp portion and the pressure welding device main body to prevent the movable clamp portion from retreating due to pressure welding force during pressure welding of the reinforcing bars.