KR19990004433A - Safety device of pneumatic welding jig - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a pneumatic welding jig, in which when a push button of a clamp of a conventional pneumatic welding jig is pressed by one hand and a workpiece is clamped by a clamp, There was always a risk of accident that could go between this clamp and the locator and be pushed by the clamp.

Therefore, the present invention is applicable to the first and second push button valves (1, 10) for clamping; A safety valve (20) for passing compressed air only when the first and second push buttons are simultaneously pressed; The air cylinder 4 is advanced through the opened chamber of the double-acting master valve 3 by passing the compressed air through the room opened by the compressed air through the safety valve, and when the first and second push buttons are not pressed A single acting master valve (30) for passing compressed air through an open chamber; When the push button for unclamping is pressed, compressed air is passed through the valve to move the air cylinder back through the opened chamber of the double acting master valve to unclamp the workpiece. And the air cylinder is touched so as to maintain the clamping of the workpiece to be welded. When the air cylinder is not touched, the air cylinder is moved back through the single acting master valve, the check valve and the double acting master valve, And an air limit valve (40) for clamping the valve so as to prevent a safety accident.

Description

Safety device of pneumatic welding jig

The present invention relates to a pneumatic welding jig, and more particularly, to a pneumatic welding jig capable of completing clamping of a workpiece placed on a locator by only pressing the pushbutton of the pneumatic welding jig with two hands, So as to provide a safety device for the jig.

Generally, the automobile is composed of an exterior part composed of a cabin, a door, an engine compartment, a trunk compartment, a fender, and the like; An inner structural part composed of a front panel, a floor panel, a rear panel and the like, which secures the strength of the entire body by supporting the outer constituent parts; Instrument panels, console boxes, etc., and carpets and sheets that are placed on the floor. The parts excluding the body part and the body part, which are built-in parts having stability, space and comfort required for the driver and passengers, A power generating device that changes the power generated by the engine in the chassis frame corresponding to the skeleton of the vehicle so as to be suitable for the driving state and transmits the generated power to the driving wheels, a steering device for arbitrarily changing the traveling direction of the vehicle A braking device for stopping at a slope during stopping or stopping the vehicle, a suspension for mitigating vibration and impact from the road surface while the vehicle is running, and a traveling device such as a steering wheel.

The chassis frame constitutes a skeleton for installing the respective components of the chassis and the vehicle body. The chassis frame has strength and rigidity enough to withstand bending, twisting, tension, vibration and the like caused by impact or load on the road surface during traveling Because of the recent light weight ^. The small-sized passenger car can reduce the weight of the vehicle by integrating the chassis frame and the vehicle body, can secure a wide effective space in the passenger compartment, and can protect the occupant and reduce the impact on other cars A monocoque body is used.

A vehicle body of such an automobile is formed by welding a plurality of panels. The pneumatic welding jig as shown in Fig. 1 is used to fix the workpiece 7 placed on the locator 6 with the clamp 5 and then welded.

2, when the workpiece 7 is set on the locator 6 of the pneumatic welding jig and then the clamp pushbutton 1a is pressed with one hand, the compressed air is discharged from the air compressor 2 When the room is closed through the push button valve 1 to the room port of the double acting master valve 3 and thus the room is converted, The supplied compressed air is supplied to the front end of the air cylinder 4 through the one side chamber.

The compressed air supplied to the front end of the air cylinder 4 advances the piston rod 4a of the air cylinder 4 so that the clamp 5 clamps the workpiece 7 placed on the locator 6 .

The compressed air in the air compressor 2 is supplied to the air cylinder 4 through the other side of the double acting master valve 3 when the push button 1a for the clamp is not pressed, that is, And the clamp 5 is in the unclamping state.

The unclamping push button 8a and the unclamping push button valve 8c are provided on the other side of the double acting master valve 3 by compressed air when the unclamping push button 8a is pressed in a state where the workpiece is clamped. The chamber is opened and is supplied to the air cylinder 4 through the pipe to be diagnosed and the workpiece 7 is unclamped.

When the workpiece 7 is clamped by the clamp 5, it is clamped by pressing the clamping pushbutton 1a with one hand so that the other hand or the pushbutton is pressed, And the locator (6), there is always a risk of accident that can be pushed by the clamp.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a clamp for clamping an object to be clamped by pressing the clamp pushbutton with two hands, And a safety device for a pneumatic welding jig to prevent a safety accident such as being caught.

An object of the present invention is to provide a push button valve for pushing a compressed air of an air compressor when the push button valve is pressed, A safety valve for passing the compressed air only when the first and second push buttons are simultaneously pressed; The air cylinder is advanced through one side of the double acting master valve by passing the compressed air directly supplied from the air compressor by the compressed air through the safety valve to one side of the air cylinder, and when the first and second push buttons are not pressed, A single acting master valve for passing the compressed air directly supplied from the compressor to the other side; When the push button for the unclamping operation is pressed, the compressed air of the air compressor through the push button valve is passed and the air cylinder is reversed through the other side of the double acting master valve to unclamp the workpiece. And an air cylinder which is touched to block the passage of the compressed air through the other chamber of the single acting master valve so as to maintain clamping of the workpiece of the clamp operated by the advancing air cylinder, The compressed air passing through the other chamber of the single acting master valve is passed to move the air cylinder back through the check valve and the other chamber of the double acting master valve to unclamp the member to be welded And a safety device is included in the pneumatic welding jig.

1 is a schematic view of a pneumatic welding jig

2 is a schematic view of a conventional pneumatic welding jig configuration

3 is a schematic view of a pneumatic welding jig including a safety device according to the present invention

DESCRIPTION OF THE REFERENCE NUMERALS

2: Air Compressor 3: Double Acting Master Valve

4: Air cylinder 5: Clamp

6: Locator 20: Safety valve

30: Single acting master valve 40: Air limit valve

50: Check valve

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 shows the construction of the present invention of a pneumatic welding jig including a safety device in which the locator 6 on which the workpiece 7 is placed and the air compressor 2 when the push buttons 1a, A first push button valve 1 for a clamp and an unclamp push button valve 8 for passing compressed air supplied from the first push button valve 1 and an unclamp push button valve 8 A double-acting master valve 3 for passing the compressed air directly supplied from the air compressor 2 by compressed air through the one side and the other side of the double-acting master valve 3, An air cylinder 4 whose piston rod 4a is advanced and retracted by compressed air and a clamp (not shown) for clamping and unclamping the workpiece 7 by a piston rod 4a of the air cylinder 4 5) is a conventional configuration, A pressure welding jig configured to configured to include a safety device below.

That is, the present invention is characterized in that the second push button valve 10 for the clamp passes the compressed air supplied from the air compressor 2 when the push button 10a is pressed; A safety valve 20 for passing compressed air through the first and second push button valves 1 and 10 only when the first and second push buttons 1a and 10a are simultaneously pressed; The compressed air directly supplied from the air compressor 2 is compressed by the compressed air through the safety valve 20 to the one side of the piston of the air cylinder 4 through one side of the double acting master valve 3, A single acting master valve 30 for advancing the rod 4a and passing the compressed air directly supplied from the air compressor 2 to the other side when the first and second push buttons 1a and 10a are not pressed; When the push button 8a for unclamping is pressed, the compressed air of the air compressor 2 through the push button valve 8 is transmitted to the air cylinder 4 through the other side of the double master valve 3, A check valve (50) for moving the piston rod (4a) of the workpiece (7) back to unclamp the workpiece (7); And the passage of the compressed air through the other chamber of the single acting master valve 30 to the check valve 50 is interrupted by the touch of the air cylinder 4 and thus the piston rod 4a, the compressed air passing through the other chamber of the single acting master valve 30 is passed through the check valve (not shown) An air limit valve 40 for unclamping the workpiece 7 by moving the piston rod 4a of the air cylinder 4 back through the valve 50 and the other chamber of the double acting master valve 3 .

Here, the compressed air from the air compressor 2 is prevented from flowing into one side of the single-acting master valve 30 when no compressed air flows through the safety valve 20, And a spring for compressing the compressed air through the safety valve 20 and opening the one side port to open the one side room.

One side port is closed and the other side port is opened through the check valve 50 so that the compressed air passing through the other side of the single acting master valve 30 flows into the air limit valve 40. The air cylinder 4 A spring that is compressed when the piston rod 4a touches the piston rod 4a prevents the compressed air from flowing into the check valve 50 by blocking the other port.

Thus, the present invention can be applied to a safety device including a second push button valve for clamp 10, a safety valve 20, a single acting master valve 30, a check valve 50 and an air limit valve 40, .

The operation of the pneumatic welding jig including the safety device will be described below.

When the first and second push buttons 1a and 10a are simultaneously pressed, the compressed air from the air compressor 2 through the first and second push button valves 1 and 10 is supplied to the safety valve 20, The safety valve 20 receives the action of the compressed air and simultaneously supplies the compressed air to the single acting master valve 30.

If the first and second push buttons 1a and 10a are not pressed at the same time, the safety valve 20 can prevent the action of the compressed air through only one of the first and second push button valves 1 and 10 So that the compressed air can not be supplied to the single acting master valve 30.

Accordingly, since the operator must use both hands to operate the pneumatic welding jig, any one of the hands does not stay on the workpiece or other parts to be welded, thereby preventing a safety accident.

Due to this operation, the safety valve 20 is a device having the first safety concept in the present invention.

The compressed air supplied to the single acting master valve 30 compresses the spring of the single acting master valve 30 to open the one side port and close the other side port to directly supply the compressed air from the air compressor 2 to the single acting master valve 30 And supplies the supplied compressed air to the double acting master valve 3 through the opened one side port.

The compressed air supplied to the double master master valve 3 opens the one side port and closes the other side port so that the compressed air directly supplied from the air compressor 2 to the double acting master valve 3 flows into the open one side port To the pre-diagnosis of the air cylinder 4.

The piston rod 4a of the air cylinder 4 is advanced by the compressed air supplied to the preliminary diagnosis and the air limit valve 40 is touched to close the opened other side room.

When the air cylinder 4 is not actuated by pushing the first and second push buttons 1a and 8a to the other side of the air limit valve 40, The compressed air is supplied to the other side of the air limit valve 40, the check valve 50 and the other side of the double acting master valve 3 to be supplied to the air cylinder 4 So that the piston rod 4a is retracted to bring the clamp 5 into the unclamping state.

The clamp 5 can not clamp the workpiece 7 unless the piston rod 4a of the air cylinder 4 touches the air limit valve 40 to close the other chamber. In other words, the first and second push buttons 1a and 10a must be kept depressed until the piston rod 4a touches the air limit valve 40. Otherwise, if the user touches the air limit valve 40, The piston rod 4a is immediately retracted by the compressed air through the other chamber so that the workpiece 7 can not be clamped.

That is, the first and second push buttons 1a and 10a must be held in both hands by the piston rod 4a until the clamp 5 is clamped by the workpiece 7.

The action of such an air limit valve 40 has a secondary safety concept in addition to the primary safety concept of the safety valve 20 in the present invention.

When the push button 8a for unclamping is pressed, the compressed air in the air compressor 2 is supplied to the air cylinder 4 through the unclamping push button valve 8, the check valve 50 and the other chamber of the double acting master valve 3. [ When the piston rod 4a is released from the air limit valve 40, the compressed spring of the air limit valve 40 is restored and the other chamber is opened to open the other side of the single acting master valve 30 Is supplied to the other side of the air limit valve 40 and supplied to the check valve 50, the other side of the double acting master valve 3 and the air cylinder 4, maintain.

As described above, according to the present invention, when the first and second push buttons are simultaneously pressed with both hands, compressed air passing through the valve can pass through the safety valve while being acted on the safety valve, The piston rod of the air cylinder which operates the air limit valve must be held with both hands until the air limit valve is touched, so that the clamping is completed, thereby preventing a safety accident of both hands.

Claims (1)

A locator 6 on which the workpiece 7 is placed; a first push button valve 1 for clamping and a push button valve 8 for clamping which passes compressed air when the push buttons 1a and 8a are pressed; , A double-acting master valve (3) for passing the compressed air through a chamber opened by the compressed air through the valves (1) and (8), and a compressed air passing through an open chamber of the double- A pneumatic welding jig comprising an air cylinder (4) having a piston rod (4a) forward and backward and a clamp (5) clamping and unclamping the workpiece (7) by the piston rod (4a) A second push button valve (10) for clamp which passes compressed air when the button (10a) is pressed; A safety valve 20 for passing compressed air through the first and second push button valves 1 and 10 only when the first and second push buttons 1a and 10a are simultaneously pressed; The piston rod 4a is advanced through the opened chamber of the double acting master valve 3 by passing the compressed air through the chamber opened by the compressed air through the safety valve 20, A single acting master valve 30 for passing the compressed air to the opened room when the button 1a (10a) is not pressed; When the push button 8a for unclamping is pressed, compressed air is passed through the push button valve 8 to move the piston rod 4a back through the opened chamber of the double acting master valve 3, A check valve 50 for unclamping the piston 7; And the passage of compressed air through the open chamber of the single acting master valve 30 to the check valve 50 is touched by the piston rod 4a so as to maintain the clamping of the workpiece of the clamp 5 , The compressed air passing through the open chamber of the single acting master valve 30 is passed through the open chamber of the check valve 50 and the double acting master valve 3 if not touched by the piston rod 4a And an air limit valve (40) for moving the piston rod (4a) backward to unclamp the workpiece (7).