JPH028626Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a pressure welding machine used for joining bar-shaped metals.

BACKGROUND OF THE INVENTION Pressure welding machines for connecting reinforcing bars used in concrete structures are already well known.

In FIG. 5, reference numeral 101 generally indicates a conventional pressure welding machine. As shown in FIGS. 6 and 7, the pressure welding machine 101 includes a hollow main body 102,
Slider 103 slidably inserted into this main body
, a fixed chuck 104 fixed to one end of the main body 102, a movable chuck 105 fixed to one end of the slider 103, and a connecting portion 107 connected to a hydraulic device 106. Movable chuck 1
05 has its leg portion 108 fixed to the slider 103 via a slit 109 formed in the main body 102. A gap is provided between the slit 109 and the leg portion 108. Therefore, slider 1
03 is rotatably inserted into the main body 102 within the above-mentioned gap. Since the fixed chuck 104 and the movable chuck 105 have the same structure except for their respective mounting positions, the structure of the fixed chuck 104 and the movable chuck 105 will be explained using FIG. 7 as a representative. Check is U
Opposing part 11 in which reinforcing bar clamping reference part 111 and fixing screw 112 are screwed together, forming character-shaped recess 110
It consists of 3. The inner surface of the reference part 111 has a positioning groove 1 for positioning the reinforcing bar material.
14 is formed. A band member 117 having centering screws 115 and 116 screwed together is fixed to the main body 102 . Centering screws 115 and 116 are arranged facing each other with leg 108 of movable chuck 105 in between. By threading these screws, the slider 103 and the main body 102
The relative position in the circumferential direction can be changed.

The pressure welding machine having the above configuration is used for pressure welding vertically extending reinforcing bars called column reinforcements and horizontally extending reinforcing bars called beam bars.

FIG. 5 shows the state of the beam reinforcement work. One reinforcing bar 118b is attached to the fixed chuck 104.
The movable chuck 105 holds the end of the other reinforcing bar 119b, and the end surfaces of both reinforcing bars abut each other. At this time, it is sufficient that the cores of the reinforcing bars match each other, but misalignment generally occurs. Therefore, the centering screw 11
After loosening screws 5 and 116 and rotating one screw to center the slider 103, screw the other screw so that the slider does not rotate. Fix it. After centering, the joint of both reinforcing bars is heated with the burner 120 and the hydraulic system is operated to push the slider 103 and remove the reinforcing bar 1.
19b is pressed against the reinforcing bar 118b. Fifth
In the figure, reference numeral 121 indicates reinforcing bars 118a, 1
A bulge formed by pressing 19a is shown, commonly known as a hump, and numerals 118c and 119c indicate reinforcing bars that have not been pressed.

To align the reinforcing bars to be pressed together, rotate the centering screws 115 and 116 to align the reinforcing bars 11
This is done by rotating the slider 103, to which a movable chuck 105 holding the chuck 9b is fixed, relative to the main body. Centering screws 115, 116
is loosened after the welding operation is completed for centering during the next welding operation. Therefore, when starting the next press-welding operation, the reinforcing bars held between the fixed chuck 104 and the movable chuck 105 are always offset from each other. In other words,
Centering work is performed every time a pressure welding work is performed at one location.

By the way, even a slight misalignment is not allowed, and a misalignment within 20% of the diameter of the reinforcing bar is generally allowed. For this reason, centering is done relatively roughly before heating with a burner starts,
If the misalignment exceeds the above-mentioned allowable value when applying pressure following heating, it is a normal centering operation to operate the centering screws 115 and 116 at that point.

Problems to be Solved by the Invention As mentioned above, the conventional pressure welding machine is equipped with a pair of centering screws 115 and 116, and the centering needs to be adjusted each time each pressure welding operation is performed. Ta.
Further, it is not easy to thread both of the pair of centering screws while heating with a burner, and requires a lot of experience and a high degree of skill. In particular, when reinforcing bars are arranged at narrow intervals, as shown in FIG. 5, one centering screw 116 (see FIG. 6) is located on the opposite side of the pressure welding machine from the operator's perspective. In order to rotate the screw, it was necessary to extend the arm to the other side of the pressure welding machine, making it difficult to operate the ratchet trench and creating a tendency for work-related accidents such as burns to occur.

As mentioned above, in pressure welding work using conventional pressure welding machines, it is essential to thread a pair of centering screws to center the reinforcing bars that are pressed against each other, resulting in poor work efficiency and The problem was that it required experience and skill.

Means for Solving the Problems The present invention has been made to solve the above problems, and in the pressure welding machine as described above,
An adjuster is mounted on the movable chuck, and is movable relatively in the same direction as the moving direction of the movable chuck, and is rotatable with the moving direction of the movable chuck as the central axis of rotation. An adjustment screw that can be rotated at a fixed position without moving in the axial direction is provided on the same side as the reinforcing bar fixing screw, and the threaded portion formed at one end of this adjustment screw is screwed into the above-mentioned adjuster. It is characterized by adopting a configuration in which That is, the structure is characterized by reducing the conventional two centering screws to one, and furthermore, this screw is provided on the side where the reinforcing bar fixing screw, which must be operated during pressure welding work, is provided.

Function When press-welding reinforcing bars, the reinforcing bar fixing screws of the fixed chuck and movable chuck are always directed toward the operator. At this time, the adjustment screw for centering is
It will inevitably be located on the worker's side. When centering is required, rotating the adjustment screw causes the adjuster to move along the threaded portion of the adjustment screw. Since this adjuster is attached to a movable chuck, the movable chuck holding the reinforcing bar material is moved in the direction of centering according to the moving adjuster. When the movable chuck is pushed by the hydraulic system, the regulator is in a fixed position,
It is slid relative to the movable chuck.

Embodiment In FIGS. 1 to 4, reference numeral 1 indicates a cylindrical main body. A hollow engagement member 2 for connecting a hydraulic device (not shown) is fixed to one end 1a of the main body 1. The other end 1b of the main body 1 is
At the other end 1b of the main body 1, which is closed by the end plate 3,
A fixed chuck 4 is fixed. The fixing chuck 4 consists of a reinforcing bar clamping reference part 4b forming a U-shaped recess 4a, and an opposing part 4c into which a reinforcing bar clamping fixing screw 5 is screwed. The fixed chuck 4 is fixed with its leg 4d along one generatrix of the cylindrical main body 1, and has a U-shaped recess 4a.
are arranged parallel to the longitudinal direction of the main body.

A slit 1c is formed in the main body 1 along the generatrix line from approximately the center thereof to one end 1a. A cylindrical slider 6 is housed inside the main body 1. This slider 6 is inscribed in the inner peripheral surface of the main body 1 and is slidable in the longitudinal direction of the main body. A leg portion 7a of a movable chuck 7 is fitted onto one end 6a of the slider 6 and then fixed thereto. The movable chuck 7 consists of a reinforcing bar clamping reference part 7c forming a U-shaped recess 7b, and an opposing part 7d into which a reinforcing bar clamping fixing screw 8 is screwed. The leg portion 7a extends through the slit 1c of the main body 1 to the bottom of the slider 6. An extensible coil spring 9 is elastically mounted between the leg portion 7a and the end plate 3, and urges the slider 6, that is, the movable chuck 7 away from the fixed chuck 4. A guide hole 9 is formed in the abdomen 7e of the movable chuck 7 in the same direction as the moving direction of the movable chuck. On the opposite side of the abdomen 7e, an elongated window hole 10 is formed along the generatrix of the guide hole.
The length of this window hole 10 is set approximately equal to or slightly larger than the movable length of the movable chuck 7.
A short cylindrical adjuster 11, as shown in FIG. 4, is slidably inserted into the guide hole 9. This adjuster 11 has a female screw 11 penetrating in the diametrical direction.
a is formed. A left-handed threaded portion 12a formed at one end of the adjustment screw 12 is screwed into the female thread 11a. The adjustment screw 12 is
A support member 13 firmly fixed to the outer peripheral surface of the main body 1
It is rotatably supported in the support hole 13a. The adjustment screw 12 is formed with a flange 12b and a hexagonal head 12c, respectively, which are positioned with the support member 13 in between. Therefore, the adjustment screw 12 is rotatably provided without moving in the axial direction. When the adjusting screw 12 is rotated clockwise, the adjuster 11 moves away from the support member 13, and when the adjusting screw 12 is rotated counterclockwise, the adjuster 11 is moved closer to the support member. Note that the main body 1 and the slider 6 as well as the guide hole 9 and the adjuster 11 are fitted together so that they do not shake each other significantly and do not hinder relative movement. In FIG. 3, for convenience of illustration, each of them is shown spaced apart.

The operation of the pressure welding machine configured as above will be explained. Before starting the pressure welding work, a straight reinforcing bar is held between the movable chuck 7 and the fixed chuck 4 and fixed with respective fixing screws 8 and 5. At this time, the adjusting screw 12 is rotated so that the reference portion 7c of the movable chuck 7 is located on the same line as the reference portion 4b of the fixed chuck 4. As shown in FIG. 2, the upper end of the reinforcing bar 14 fixed as a column bar is inserted into the recess 4a of the fixing chuck 4 (see FIG. 1).
After fitting, the fixing screw 5 is tightened, and the reinforcing bar material is held between the positioning groove 4e (see FIG. 1) and the fixing screw 5. As a result, the pressure welding machine
It is attached to the upper end of 4. Then,
After the lower end of the other reinforcing bar 15 is fitted into the recess 7b of the movable chuck 7, the fixing screw 8 is tightened to sandwich the reinforcing bar between the positioning groove 7e and the fixing screw 8. Of course, when fixing such reinforcing bars, the fixing screws 5 and 8 are directed toward the operator. When the reinforcing bars have been set, if the ends of the opposing reinforcing bars are straight, their cores are aligned. but,
If one end of both reinforcing bars is bent, both reinforcing bars are misaligned. If this misalignment is within the allowable value, the pressure welding operation is continued.

If the misalignment is greater than the allowable value and the bending of the reinforcing bars is tolerable, the adjustment screw 12 is rotated in either direction to correct the misalignment. That is, when a ratchet trench (not shown) is engaged with the adjusting screw 12 located on the operator's side and rotated, the adjuster 1 changes depending on the direction of rotation.
1 moves the movable chuck 7 into which the adjuster is fitted to a position where misalignment is corrected.

In addition, in the illustrated embodiment, the main body and the slider are respectively made into cylindrical bodies and are slidably fitted into each other.
The main body and the slider may each have a polygonal cross-sectional shape such as a triangle or a square.

Effects of the invention When correcting misalignment, the operator turns the adjusting screw 12 using a ratchet trench (not shown), but since this adjusting screw is located on the operator's side, Extremely easy to work with.
In addition, the operator can center the reinforcing bars by simply selecting the direction of rotation of the only adjustment screw, making it possible to efficiently center the reinforcing bars and, by extension, to perform the welding work itself extremely efficiently. . This not only improves workability, but also greatly contributes to saving fuel costs for the burner, since centering work can be completed in a short time.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a front view of the same as above, Figure 3 is a sectional view along the - line in Figure 2, Figure 4 is an exploded perspective view showing the adjuster and adjustment screw, and Figure 5 is a A perspective view showing a state in which a muscle is pressure welded, Figure 6 is a plan view of a conventional pressure welding machine, and Figure 7 is B in Figure 6.
-B sectional view. 1...Main body, 4...Fixed chuck, 6...Slider, 7...Movable chuck, 8...Fixing screw, 9...
...Guide hole, 11...Adjuster, 12...Adjustment screw,
12a...screw part.

Claims (1)

[Scope of utility model registration request] a hollow main body, a fixing chuck fixed to an end of the main body and clamping an end of one of the reinforcing bars, and a slider slidably fitted to the main body;
In a pressure welding machine having a movable chuck that is fixed to the slider and clamps the end of the other reinforcing bar, the chuck moves relative to the movable chuck in the same direction as the moving direction of the movable chuck. fixing the adjuster on the same side of the main body as the side on which the fixing screw of the movable chuck is installed; 1. A pressure welding machine comprising: an adjustment screw rotatably provided at a position, the adjustment screw having a threaded portion formed at one end thereof screwed into the adjuster.