JP2533648Y2 - Pressurizer and pressurizing device for gas pressure welding of rebar - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a pressure welding machine used for rebar gas pressure welding work in which steel bars for reinforced concrete are heated using an oxygen acetylene gas flame and the ends of the rebar are joined while applying pressure. To a pressurizing device and a pressurizing device for pressurizing the pressure.

[Conventional technology]

As a conventional device of this type, as shown in FIG.
A hydraulic pressurizing cylinder 83 is connected to a pressure welding device 80 having a fixed clamp 81 and a movable clamp 82 for gripping the reinforcing bar W,
Electric hydraulic pump unit (hydraulic unit) 84 and pressurizing cylinder 83
Are connected by a high-pressure hose 85 to supply the pressurized oil of the hydraulic pump device 84 to the pressurizing cylinder 83, and the plunger 83a drives the movable clamp 82 in the arrow Z direction. Then, the motor of the hydraulic pump device 84 is turned on by the operation switch 88 provided in the holder 87 of the burner 86 for heating the rebar press contact portion.
・ Pressure oil is supplied by OFF control. 89 is a control cable for motor control. Reference numeral 91 denotes an oxygen hose connected to an oxygen supply source, and reference numeral 92 denotes an acetylene hose connected to an acetylene gas supply source.

[Issues to be solved by the invention]

However, in the conventional pressurizing apparatus for gas pressure welding of a reinforcing rod, the hydraulic pump device 84 is large and heavy. For example, when performing pressure welding work at a building construction site, labor is required to carry it. In addition, connecting the pressurizing cylinder 83 and the hydraulic pump device 84 attached to the connecting portion of the reinforcing bar with the long and hard-to-bend high-pressure hose 85 requires time and effort, and causes a decrease in the efficiency of the pressure welding work. It was connected.

This invention solves the above-mentioned conventional problems, and is intended to provide a pressurizing apparatus and a pressurizing apparatus for gas pressure welding of a reinforcing bar, which have a simple structure and are easy to handle.

[Means for solving the problem]

Thus, the pressurizing device for rebar gas pressure welding of the present invention has a plunger for driving the pressure welding device, a return spring for returning the plunger built in the cylinder main body, and one end of the cylinder main body for attaching and detaching to the pressure welding device. An opening / closing valve for opening and closing an oil drain between the oil tank and the pressurizing chamber of the pressure cylinder, and a suction side connected to the oil tank; A casing having a built-in electric-powered hydraulic pump for supplying pressure oil to the pressurizing chamber is directly connected.

In addition, the pressurizing apparatus for gas pressure welding of a rebar according to the present invention includes a plunger for driving a pressure welding device, a return spring for the operation of returning the plunger built in the cylinder body, and an attachment / detachment to the pressure welding device at one end of the cylinder body. An opening / closing valve for opening and closing an oil drain between the oil tank and the pressurizing chamber of the pressure cylinder, and a suction side connected to the oil tank; And a casing having a built-in electric hydraulic pump for supplying pressurized oil to the pressurizing chamber is directly connected, and the electric motor for driving the hydraulic pump is provided on a holder of a burner for heating a reinforcing steel bar. It is characterized by being connected to a control device for supplying power to the electric motor by an output signal of an operation switch.

In the present invention, the operation switch and the control device are connected by a control cable, and an output signal of the operation switch may be provided to the control device as a wired signal, or an operation switch that emits a wireless signal as an output signal may be used. The configuration may be such that the control device is operated by a wireless signal.

[Action]

In the pressurizer of the present invention, since the casing having the oil tank and containing the on-off valve and the hydraulic pump is directly connected to the cylinder body of the pressurizing cylinder, there is no need to connect the equipment with the conventional high-pressure hose. Easy to handle. The pressurizing cylinder integrated with the casing part is attached to and detached from the press-contact device by a connector. Then, in the connection state to the pressure welding device, the pressure oil is supplied to the pressure chamber of the pressure cylinder by driving the hydraulic pump, the plunger protrudes to drive the pressure welding device in the rebar pressing direction, and the plunger is opened by opening / closing the opening / closing valve. It is driven in the retracting direction by the return spring.

Further, in the pressurizing device of the present invention, the output signal of the switch is given to the control device by operating the operation switch provided on the holder portion of the burner, and the electric motor of the hydraulic pump is driven to perform the above-described rebar pressing. . If the output signal of the operation switch is used as a radio signal and the control device is operated by this radio signal, there is no need to connect the holder of the burner and the control device with a control cable, and the operation of the burner at the pressure welding work site is eliminated. The handling of the control and the control device becomes even easier.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows the entire rebar gas pressure welding apparatus, and FIG.
The same parts as those in the drawings are denoted by the same reference numerals. 1 is a pressurizing apparatus for gas pressure welding of reinforcing steel, 2 is a pressurizer as its main component, 3 is a pressurizing cylinder, 4 is a casing, 5 is an electric motor for driving a hydraulic pump built in the casing 4. is there. 6 is a control device, 7 is a power cord of the electric motor 5,
Connected to control device 6. Reference numeral 8 denotes an operation switch provided on the holder 87 of the burner 86. The operation switch 8 includes a transmission unit 11 for transmitting a wireless output signal (for example, a 143 MHz FM signal) from the antenna 10 by pressing the push button 9.

Next, FIG. 2 is a hydraulic and electric circuit diagram of the pressurizing apparatus for rebar gas pressure welding of the present invention.
A pressure oil supply passage connecting the discharge side of an electric hydraulic pump 13 with the suction side connected to 12 and the pressure chamber 15 with the pressure cylinder 3
A relief valve 17 is connected to 16, and a check valve 18 for preventing return oil is connected to a position closer to the pressurizing chamber 15 than the relief valve 17. Reference numeral 19 denotes an oil discharge passage connected to the pressure oil supply passage 16 between the check valve 18 and the pressurizing chamber 15 and reaching the oil tank 12, and reference numeral 20 denotes a manually operated on-off valve. Reference numeral 21 denotes a pressure gauge, which may be removed after the pressure of the relief valve 17 is set. The control device 6 includes an antenna 25 for receiving a radio signal, a receiving unit 26 for converting the radio signal into an electric signal, and an amplifier 27 for amplifying the electric signal.
And an electromagnetic switch that is closed by the output signal of this amplifier 27
The power cord 29 is connected to a 100 V AC power supply.

FIG. 3 shows the entire configuration of the pressurizer 2. The casing 4 includes a first casing 4A containing a hydraulic pump 13 and valves and a gear mechanism and a first oil tank 12A connected to the first casing 4A. And a second casing 4B that holds the second oil tank 12B. The electric motor 5 for driving the pump is connected to the second casing 4B. The pressurizing cylinder 3, which is a single-acting hydraulic cylinder connected to the first casing 4A, has a piston 32 built in a cylinder body 31, and a plunger 33 integral with the piston 32 has a return spring 34 composed of a compression spring. As a result, the plunger 33 is urged toward the retracting side. Reference numeral 35 denotes a connector attached to the tip of the cylinder body 31. Three short columnar projections 36 are radially projected and fixed to the outer periphery of the cylinder body 31 every 120 degrees. The protrusion 36 is engaged with and disengaged from three L-shaped grooves 37 provided at the connection end.

FIGS. 4 to 8 show the internal structure of the hydraulic equipment section, in which a first oil tank 12A filled with hydraulic oil is provided with a second casing 4A.
B is closed by the concave end surface of the first casing 4A, and the second casing 4B has a second
An oil tank 12B is provided, and the second oil tank 12B and the first oil tank 12A communicate with each other to form the oil tank 12. The second oil tank 12B is formed by accommodating a cylindrical rubber tank 43 having a closed top in a cylindrical container 42 screwed into the second casing 4B and fixing the base thereof by a seal ring 44. Hydraulic oil is filled in a rubber tank 43 communicating with 12A.

The hydraulic pump 13 incorporated in the first casing 4A is a plunger pump type pump. The head of the plunger 53 slidably fitted to 4A is pressed by a compression spring 54. The rotating shaft 51 is driven to rotate by a gear 55 meshing with the rotating shaft of the electric motor 5. Reference numeral 56 denotes a plunger plug for setting the compression spring 54, reference numeral 57 (see FIG. 7) denotes a check valve provided at an oil suction port 58 communicating with the first oil tank 12A and opened at the time of oil suction, and reference numeral 59 denotes a discharge port 60. The check valves are provided and opened when the oil is discharged. These check valves are also components of the hydraulic pump 13. The pressurized oil supply path 16 is connected to a discharge port 60 of the hydraulic pump 13.
Oil supply / discharge port connected from the section to the pressurizing chamber 15 of the pressurizing cylinder 3
62, a direct-acting relief valve 17 is connected to an intermediate portion of the first casing 4A as shown in FIG. The check valve 18 is provided at a position near the oil supply / drain port 62. 17a
Is an oil discharge port communicating with the first oil tank 12A, and forms an oil return path when the relief valve 17 is operated. The large-diameter portion 16a of the pressure oil supply passage 16 that houses the check valve 18 and communicates with the oil supply / drain port has a first oil tank 12A.
An oil discharge passage 19 communicating with the oil discharge passage 19 is connected, and a manually operated open / close valve 20 is provided at a position of the oil discharge passage 19 near the large-diameter portion 16a. The on-off valve 20 urges a needle valve 64 slidably fitted in a valve hole 63 in a direction in which the needle valve 64 is pressed against a valve seat 66 by a compression spring 65 so as to prevent return oil. A substantially L-shaped lever 67 for manual operation is connected to the end. The base of the lever 67 engages with the end face of the nut 69 for locking the compression spring retainer 68, and when the tip 67a of the lever 67 is pressed by hand in the direction of the arrow X, the lever 67 is moved to the outer periphery of the end face of the nut 69. The needle valve rotates as a fulcrum with the point P.
64 is driven in a direction away from the valve seat 66 as shown by an arrow Y. Reference numeral 70 denotes a guide plate fixed to the first casing 4A for guiding the lever 67 so that the lever 67 does not rotate around the axis of the needle valve 64 by fitting an intermediate portion of the lever 67 into the notch 71. It is.

In order to perform gas pressure welding of two rebars W using the apparatus having the above configuration, the fixed clamp 81 and the movable clamp
82, each rebar W is gripped, and the pressurizing cylinder 3 is
After that, the push button 9 of the operation switch 8 of the holder 87 of the burner 86 is pressed. As a result, the output signal of the operation switch 8 is given to the control device 6 as a radio signal. In the control device 6, the electromagnetic switch 28 is closed to supply power to the electric motor 5. When the electric motor 5 rotates by the power supply, the plunger 53 driven by the rotating shaft 51 reciprocates,
The hydraulic pump 13 supplies pressure oil from the pressure oil supply passage 16 to the pressurized cylinder 3.
Into the pressurizing chamber 15. As a result, the piston 32 and the pole flange 33 are driven in the protruding direction, and the movable clamp 82 of the crimping device 80 is pressed and driven in the direction of arrow Z, so that the opposing end faces of the two rebars W fixed to both clamps are pressed against each other. Contact. This prevents the plunger 33 from advancing, and when the oil pressure in the pressurizing chamber 15 reaches a predetermined set pressure, the relief valve 17 operates. Then, when the pressing of the push button 9 of the operation switch 8 is released, the electromagnetic switch 28 is opened to open the electric motor 5 and the hydraulic pump.
13 stops, but the pressure oil in the pressurizing chamber 15 of the pressurizing cylinder 3 is sealed by the check valve 18 and the on-off valve 20 in the closed state, and is prevented from leaking into the oil tank 12. Maintains the protruding state, and the rebar W
As long as the deformation does not progress, the pressing force of the end face of the rebar W is hardly reduced and the pressed state is maintained. Therefore, the heating of the rebar pressing portion by the burner 86 and the re-pressing operation of the pressurizing device 2 by the operation switch 8 are performed according to a predetermined procedure, and the gas pressure welding of the rebar by the two-stage or three-stage pressing method or the constant pressure method is performed. Do it. At the end of the press-contact, if the tip 67a of the lever 67 is pressed by hand, the needle valve 64 is driven in the direction of arrow Y to open the on-off valve 20, and the oil in the pressurizing chamber 15 is mainly drained by the pressing force of the return spring 34. The oil is drained to the oil tank 12 through the passage 19, is driven in the retracting direction by the return spring 34 of the plunger 33, returns to the return position shown in the third illustration, and the pressurizing cylinder can be removed from the pressure welding device 80. When the manual pressing of the lever 67 is released, the on-off valve 20 is closed, and the next operation can be provided.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the operation switch 8 is of a type that emits a radio signal, and the control device 6 supplies power to the motor 5 during reception of the radio signal. The control device 6 may be configured to automatically supply power to the electric motor during a predetermined time period from the reception of the radio signal or according to a predetermined program. Further, the operation switch and the control device are connected by a control cable, and the output signal of the operation switch is output. May be given to the control device as a wired signal. Further, the connecting member 35 of the pressurizing cylinder 3 may have a configuration other than the type in which the protrusion 36 is engaged with or disengaged from the groove 37. In the pressurizer 2, the oil discharge passage 19 may be directly connected to the pressurizing chamber 15 of the pressurizing cylinder 3 without passing through the pressurized oil supply passage 16. The manual on-off valve 20 is of a type in which a needle valve 64 is screwed in and is opened and closed by rotating around a valve axis by a lever fixed to the shaft end of the needle valve. Various types can be used, such as a type in which the valve element of a check valve that is automatically closed by return oil from the valve is pushed up by a push rod, separated from the valve seat and opened. Further, the on-off valve 20 may be an electromagnetic on-off valve, and a push button for operating this electromagnetic on-off valve may be additionally installed on the operation switch 8.

[Effect of the invention]

As described above, according to the present invention, since the casing having the oil tank and including the on-off valve and the electric hydraulic pump is directly connected integrally with the pressurizing cylinder, the pressurizing cylinder and the pressurizing cylinder when using the pressurizer are used. The connection work with the high pressure hose between the pressurized oil supply device is not required, and the piping work between the casing and the pressurizing cylinder and each device such as the on-off valve and the hydraulic pump in the casing when manufacturing the pressurizer is also unnecessary. Provided is a rebar gas pressure welding press that is compact, easy to handle, and easy to manufacture. Further, since the pressurizer only needs to connect the motor for driving the pump to the control device, and the connection is easy, the pressurizing device for the rebar gas pressure welding which has a simple overall structure and is easy to handle is provided.

In addition, a return spring is built in the cylinder body and an open / close valve that opens and closes the oil discharge passage between the oil tank and the pressurizing chamber of the pressurizing cylinder is provided. Thereby, the pressurizer can be easily attached to and detached from the pressure welder while avoiding interference between the plunger tip and the movable clamp of the pressure welder.

[Brief description of the drawings]

1 to 8 show an embodiment of the present invention, FIG. 1 is a structural view of a rebar gas pressure welding device, FIG. 2 is a hydraulic and electric circuit diagram, and FIG. 3 is a part of a pressurizer. Notched front view,
FIG. 4 is a longitudinal sectional view of the main part, and FIG.
FIG. 6 is a sectional view taken along the line B-B of FIG.
7, FIG. 7 is a sectional view taken along the line CC of FIG. 6, FIG. 8 is a sectional view taken along the line DD of the first casing portion of FIG. 5, and FIG. FIG. 2 is a device configuration diagram illustrating an example. 1 ... Pressure device for gas pressure welding of reinforcing steel, 2 ... Pressurizer, 3 ...
Pressing cylinder, 4 ... Casing, 5 ... Electric motor, 6 ...
... Control device, 8 ... Operation switch, 10 ... Antenna, 11
... Transmission unit, 12 ... Oil tank, 13 ... Hydraulic pump, 15 ... Pressure chamber, 19 ... Drainage passage, 20 ... On-off valve, 25 ... Antenna,
26 ... Receiving unit, 28 ... Electromagnetic switch, 31 ... Cylinder body, 33 ... Plunger, 34 ... Return spring, 35 ... Connector, 36 ... Protrusion, 37 ... Groove, 64 ... Needle Valve, 67
… Lever, 80… Crimper, 86… Burner, 87… Holder, 88… Operation switch.

Claims (3)

(57) [Scope of request for utility model registration] A pressurizing device having a plunger for driving a pressure welder, a return spring for returning the plunger, which is built into the cylinder body, and a connecting member for attaching and detaching to and from the pressure welder at one end of the cylinder body. An opening / closing valve that has an oil tank in the cylinder body of the cylinder and opens and closes an oil discharge path between the oil tank and the pressurizing chamber of the pressurizing cylinder; and a pressure oil connected to the oil tank with a suction side connected to the oil tank. A pressurizing machine for gas pressure welding of rebars, characterized by directly connecting a casing containing an electric hydraulic pump for supplying air. 2. A pressurizing device comprising a plunger for driving a pressure welding device, a return spring for returning the plunger being built into the cylinder body, and a connecting member for attaching and detaching to and from the pressure welding device at one end of the cylinder body. An opening / closing valve that has an oil tank in the cylinder body of the cylinder and opens and closes an oil discharge path between the oil tank and the pressurizing chamber of the pressurizing cylinder; and a pressure oil connected to the oil tank with a suction side connected to the oil tank. With a built-in casing that incorporates an electric hydraulic pump that supplies
An electric motor for driving the hydraulic pump is connected to a control device for supplying power to the electric motor by an output signal of an operation switch provided on a holder of a burner for heating a reinforcing bar pressure welding portion, wherein the pressing device for reinforcing gas press welding is connected. Pressure device. 3. The pressurizing device for reinforcing steel gas pressure welding according to claim 2, wherein the output signal of the operation switch is a wireless signal.