KR100834645B1 - An actuator practicing access prepared distance and worked distance for operating tool - Google Patents

Abstract

The present invention relates to an actuator for performing a pre-stroke and a work stroke for operating a tool, the actuator comprising an actuator body consisting of a retract cylinder and a pressure cylinder, an oscillating arm connected to the actuator body, and a fixed arm, the actuator A first ball insertion groove formed in the pressurizing rod and a space into which the pressurizing rod is inserted, so that the pressurizing rod connected to the retract cylinder of the body and the piston of the pressurizing cylinder and the connecting rod connected to the swinging arm can be integrated or separated from each other. A stopper mechanism comprising a pressing member and a stopper member disposed in the space portion of the connecting rod formed therein, a second ball insertion groove formed in the stopper member, and a stopper ball positioned in the first ball insertion groove or the second ball insertion groove. At the same time using the retract cylinder The present invention relates to an actuator configured to perform preliminary stroke and work strokes for rocking and fixed arms.

Actuator, Retract Cylinder, Pressurized Cylinder, Pressurized Rod, Connecting Rod, Stopper Mechanism

Description

AC ACTORATOR PRACTICING ACCESS PREPARED DISTANCE AND WORKED DISTANCE FOR OPERATING TOOL}

1 is a side view of a state of use of a conventional actuator for executing an access pre-stroke and a working stroke

Figure 2a to 2c is a side cross-sectional view of the conventional actuator

3A-3C are side views of actuators in respective states of executing an approach pre-stroke and a stroke according to the present invention.

4A-4C are side cross-sectional views of the actuator body in each state of executing an approach pre-stroke and a stroke according to the present invention;

(Explanation of reference numerals)

100; Actuator 101; Actuator body

102; Clamp body 103; Connection load

104; Link connector 105; Upper pivot connection member

106; Links 107,111; cancer

108; Rocking arm 109; Lower pivot connection member

110; Pivot 112; Fixed arm

113; Upper electrode 114; Bottom electrode

115; Welding clamps 116; 1st pressure piston

117; Pre-stroke piston 118; Retract Cylinder

119; Second pressure piston 120; 3rd pressure piston

121; Fourth pressure piston 122; Pressurized cylinder

123,124,125; Load 126; Pressurized rod

127; First ball insertion groove 128; Hollow part

131; Space 132; Pressure member

133; Stopper member 134; 2nd ball insertion groove

135; Stopper Ball S: Space behind the stopper member

a, b; Air inlet c, d, e: second to fourth air outlet

f, g; Air outlet

The present invention relates to an actuator for performing an approach pre-stroke and a work stroke for operating a tool, in particular a stopper mechanism and a retract cylinder arranged between a pressure rod and a connecting rod connecting the oscillating arm and the actuator body. The actuator relates to an actuator configured to integrally or separate the pressurizing rod and the connecting rod, and to simultaneously perform preliminary stroke and work stroke of the rocking arm and the fixed arm operated by the actuator body.

The tool used herein is designed to perform welding, stamping, stapling or other assembly processes, and conventional pneumatic (or hydraulic) actuators for operating the tool are as shown in FIG.

1 is a view for explaining the welding state in terms of the driver is applied to the welding point with the help of the X-shaped welding clamp of the conventional actuator.

As shown in Fig. 1, the welding clamp is composed of an upper electrode holder arm 3 serving as a swinging arm and a lower electrode holder arm 2 serving as a fixed arm. The two arms are connected to each other in the form of articulated links by a pivot (4), the actuator (1) is connected and attached to the stationary arm (2) by a rod (6), and by the body of the clamp (5) It is connected and attached to the swinging arm 2. In some cases, the welding clamp is fixed together with the weld conveyor 7.

In addition, although not shown, such actuators may include a front retract cylinder for access pre-stroke and a rear two or three or more stage multi-stroke stroke cylinder with a plurality of pistons for work stroke in series. By using the front retract cylinder connected to the rod, move the rocking arm slightly to open the welding clamp, and then move the rocking arm further by the operation of the back pressure cylinder to fully adhere the welding clamp. We do welding work.

In the example of the manual welding state described here, the clamps are suspended on the counter balance 11 by a giro circle 9 and a shaft 10 to facilitate the adjustment of the tool without the driver being disturbed by weight. do. The site P to which the welding point is applied is fixed relative to the ground.

Specifically, in order to weld a workpiece, such as two nested sheets, using such an actuator, first of all, to clamp the sheets 12, 13 between the electrodes 2 ', 3', i.e. the rocking arm by the actuator ( According to the operation of 3), the distance between the electrodes 2 ', 3' is adjusted and opened (access pre-stroke), and the electrodes 2 ', 3' are sandwiched between the sheets 12, 13. ) Are in close contact with each other. If sufficient force is produced by the operation of the actuator in close contact with the electrodes, current is passed through the workpiece to fuse the core between the workpieces (work stroke). After cooling, the core becomes the assembly point N.

At the end of such a welding cycle, the actuator 1 is commanded to open the welding clamp so that the tool is positioned at the next point (N + 1) within the welding range, thereby bringing the welding clamp to the next point. You can move.

However, as mentioned above, in the case of the actuator which consists of two strokes of an approach pre-stroke and a work stroke, in order to obtain the large pressing force required by an industrial site, the capacity of a cylinder is simply enlarged, and the actuator apparatus must be enlarged. There is no problem.

In order to solve this problem, as described above, an actuator device is proposed in which the pressurizing cylinder is made up of three or more stages of multistage stroke cylinders, while the actuator device can be made compact, while the pressing force can be increased by the multiple stage cylinders. However, in this case, there is a problem that the repulsive force received by the pressure cylinder of the multi-stage when the welding operation is performed only by the retract cylinder. That is, for example, when a multistage cylinder consisting of three stages each has a cylinder capacity of Ø90, a cylinder capacity of Ø180 is obtained. However, a retract cylinder that receives a repulsion force has a cylinder capacity of about Ø100. As a result, there is a problem in that a large capacity repulsion force must be handled, and despite the advantages of an actuator having a multi-stage stroke cylinder, there is a limit to installing the cylinder in random stages.

As an example of an actuator for improving such a problem, there is an 'actuator for performing an access pre-administration and a work stroke for operating a tool' disclosed in Korean Patent No. 2001-0071789. The configuration and operation of the actuator will be described below.

Figure 2 shows a side cross-sectional view of the conventional actuator, Figure 2a shows the actuator in a fully retracted position in the context of adjusting the clamp form or similar tool, and Figure 2b shows the clamp form in a position where the clamp is slightly open. Or the actuator after the pre-stroke piston has moved to the end of the approach position in the context of adjusting a similar tool, and FIG. 2C shows that the working piston in the situation of adjusting the clamp form or similar tool in the position at which the workpiece is clamped. The actuator after moving to its working position is shown.

As shown, the body 21 of the actuator is sealed by the front cylinder head 22 and the rear cylinder head 23. It has on its side pipes 24 and 25 that connect with valves to add or discharge compressed air from other chambers of the actuator depending on the various operating steps.

What cannot be moved in the body 21 of the actuator is the pre-stroke piston 26 in the pre-stroke pressure chamber 27 spanning between the front cylinder head 22 and the intermediate cylinder head 28. This pre-stroke piston 26 is connected to a hollow pre-stroke rod 29 which bears the extended area 30 at its outer end, whereby the body 5 of the tool (welding clamp) or It can be fixed to the frame of the welding machine.

delete

The working piston 31 in the working pressure chamber 32 spanning between the intermediate cylinder head 28 and the other intermediate cylinder head 33 is pre-stroked by a positioning rod 35 with a ramp. It is connected to an actuating rod 34 that is slidably supported by the rod 29. The outer end of the actuating rod 34 coming out of the positioning rod 35 is a moving part of the tool to enable the clamp to apply a clamping force to carry out the welding process, for example on a sheet to be welded. Start up.

And an amplification chamber that spans between the intermediate cylinder head 33 and another intermediate cylinder head 39 and between the another intermediate cylinder head 39 and the rear cylinder head 23. Two amplifying pistons 36, 37 supported respectively at 40. These two pistons 36, 37 (which may be more) are connected to the rods 41, 42, respectively, whereby they exert an auxiliary thrust on the actuating rod 34.

The body 21 of the actuator is axially moved to a fixed pre-stroke rod 29 which can be braked. For this purpose, the actuator has a bulge 46 at the end of the lamp and is supported for sliding axially between the actuating rod 34 and the pre-stroke rod 29. As a result of the operation of the positioning rod 35 with a ramp, the brake bearing 43, which is supported in the groove 44 of the pre-stroke rod 29 and designed to engage in the pocket 45 of the cylinder head 22, is provided. Is provided with a set of.

The positioning rod 35 is in one direction by the spring 47 compressed between the shoulder 48 of the actuating rod 34 and the ring 49 inserted between the rods 34, 35 and the actuating rod 34. It is provided in close proximity to the outer end and is axially maneuvered in two directions, the other direction by a stop 50 designed to bear on the free end of the positioning rod 35 with a ramp.

In this case, the actuator described above is operated as follows.

In the position shown in FIG. 2A, the pressure is in the chambers 27, 32, 38, 40 on the rear face of the pre-stroke piston 26 and on the front face of the working piston 31 and the amplifying pistons 36, 37. Is achieved. The pressure in the chamber 27 causes the intermediate cylinder head 28 to recoil (with respect to the tool and the pre-stroke rod 29 fixed), from which the actuator body 21, to the chambers 32, 38 The pressure at 40 (or only one of them) maintains the working rod 34 at the position farthest from the tool.

From this point it is possible for the clamp to reach this slightly open position by maintaining pressure on the front face of the pistons 31, 36, 37 and also applying pressure to the front face of the pre-stroke piston 26. The other part of the chamber 27, which is then under pressure in advance, is opened and closed in the discharge mode (right side of the piston 26 in FIG. 2b). Since the piston 26 is fixed against the tool, as pre-stroke rod 29, the pressure applied to the front cylinder head 22 is of the actuating rod 34, in the position where the welding clamp is slightly open. This causes the actuator body 21 to move towards the tool.

From this slightly open position shown in FIG. 2B, it is possible to recover the pressure on the rear face of the pre-stroke piston 26 or to the closed position of the clamp to perform clamping and welding operations on the seats 12, 13. By commanding to open and close, it is possible to return to the wide open position shown in FIG. 2A.

To do this, to maintain the actuator in the position shown in FIGS. 2B and 2C and to apply pressure to the chambers 32, 38, 40 on the rear surfaces of the working piston 31 and the amplifying pistons 36, 37. Maintain sufficient pressure on the front face of the pre-stroke piston 26 (of course, the compartments of the opposite chambers on the side of these piston front face are opened and closed in discharge mode).

As a result, the actuation rod 34 is moved relative to the actuator body 21 towards the left side of FIG. 2C, causing the pre-stroke rod 29 to brake on the actuator body 21. In fact, the bulge 46 of the positioning rod 35, which is governed by the thrust movement by the springs 47 caught on the shoulders 48 of the working rods, tilts the bearings 43 to the outside and pulls them forward cylinders. Braking at the bottom of the pocket 45 at the head 22. Thus, prevailing pressure in the working chamber 32 and the amplification chambers 38 and 40 (on the rear face of the corresponding piston) cannot cause the actuator body 21 to rebound to the right. This body is braked in the position shown in FIG. 2C, so this purpose is to cause the welding clamp to move to the operating position shown in FIG. 2C, corresponding to the closed position.

If a welding run is applied, the bearing 43 applies a high pressure on the positioning rod, which in turn brakes. Since the rod slides on the positioning rod 35 by compressing the spring 47, the extension of the axial movement of the actuating rod 34 in the discharge direction is prevented. Thus, movement of the electrodes 2 ', 3' (or any other tool) in the clamping direction is not prevented while they exert their forces.

The return from the working piston shown in FIG. 2C to the slightly open position shown in FIG. 2B causes the working rod 34 of the body 21 to be retracted in the working chamber 32 and the amplification chambers 38, 40. This is done by reversing the pressure. During this retraction, the stop 50 of the rod 34 at the end of the positioning rod 35 releases the actuator body 21 and the pre-stroke rod 29 and as a result the complete shown in FIG. 2A. The open position is summarized in the manner described above.

However, in the case of the conventional actuator as described above, when the pre-stroke piston 29 moves, the cylinder of the actuator body of the sheath also moves along, so that it can touch the body of the worker who handles the actuator, The problem is that it may adversely affect safety and may also rotate when the actuator body moves, and in fact, it is necessary to attach a separate guide to the actuator body to fix it.

In order to improve the problems of the conventional actuator as described above of the present invention, an actuator body consisting of a retracting cylinder and a pressure cylinder and a rocking arm and a fixed arm connected to the actuator body, the actuator of the A first ball insertion groove formed in the pressurizing rod and a space portion into which the pressurizing rod is inserted, so as to integrally or separate the pressurizing rod connected to the retract cylinder and the piston of the pressurizing cylinder and the connecting rod connected to the swinging arm; A stopper mechanism comprising a pressing member and a stopper member disposed in the space portion of the connecting rod, a second ball insertion groove formed in the stopper member, and a stopper ball positioned in the first ball insertion groove or the second ball insertion groove. And at the same time, the rocking arm by the retract cylinder The aim is to provide an actuator for carrying out the preliminary administration and work stroke of the fixed arm.

In order to achieve the above object, the actuator of the present invention,

In the actuator which is clamped by the rocking arm and the fixed arm, and operates the clamp by the vertical displacement of the rocking arm with respect to the fixed arm,
The actuator includes a retract cylinder connected to the body of the clamp, and a pressurized cylinder disposed side by side with the retract cylinder such that a central axis coincides with each other;
The retract cylinder includes a pre-stroke piston and a first pressure piston disposed inside the pre-stroke piston and guided on an inner surface of the pre-stroke piston, wherein the first pressure piston defines the oscillating arm. It is provided with the hollow connection rod which forms the connection hole in one end for connecting with a link,
The pressure cylinder includes an actuator body and second to fourth pressure pistons disposed side by side within the body, and the second pressure piston passes through the centers of the pre-stroke piston and the first pressure piston, And a pressure rod extending toward the space portion, wherein the third pressure piston has a rod in contact with one side of the second pressure piston, and the fourth pressure piston is in contact with one side of the third pressure piston. With a rod,
The pressing rod of the second pressing piston forms a first ball insertion groove along the shaft circumference of the pressing rod at the tip side thereof,
Between the connecting rod and the pressure rod is disposed a stopper member having a second ball insertion groove formed on the surface facing the pressure rod,
A pressing member is disposed along an inner surface of the connecting rod between the connecting rod and the pressing rod so as to push one side of the stopper member, and is disposed in a space formed between the pressing rod and the stopper member to expand or contract the pressing rod. Accordingly, a plurality of stopper balls are inserted into the first ball insertion groove and the second ball insertion groove.

In addition, the pressing member is characterized in that the spring is another.

In addition, the pressing member is characterized by another air cylinder.

Hereinafter, an embodiment of an actuator of the present invention will be described in detail with reference to the accompanying drawings.

First of all, the same components or parts in the drawings are denoted by the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known technologies or configurations are omitted in order not to obscure the subject matter of the present invention.

Figures 3a to 3c show a front view of an actuator for carrying out an approach pre-stroke and a stroke according to the invention, where Figure 3a is the actuator when the clamp is fully closed and Figure 3b shows that the clamp has been opened small. It is an actuator at the time, and FIG. 3C shows an actuator when the clamp is largely opened.

As shown in the drawing, a clamp body 102 is attached to one end of the actuator body 101 constituting the actuator 100 by incorporating a retractor cylinder and a pressurizing cylinder, which will be described later, and inserted at one end. And a connection rod 103 protruding outward is provided, and a link connection hole 104 penetrates through the protruding end of the connection rod.

One end of the upper pivot connecting member 105 is connected to the link connecting hole 104 of the connecting rod 103 by a link 106, and the upper pivot connecting member is connected to an arm 107 opposite to the link connecting hole. And a pivot arm 108 that functions as an upper electrode holder arm, the other end of the upper pivot connecting member having one end connected to the clam part body 102 with a lower pivot connecting member 109. Is connected to the middle portion of the pivot 110 and the lower pivot connecting member 109 is composed of a fixed arm 112 to function as a lower electrode holder arm with an arm 111 connected to the opposite side of the clamp body and At each end of the rocking arm and the fixed arm, an upper electrode 113 and a lower electrode 114 are respectively provided to face or adhere to each other.

Therefore, as will be described in detail later, the rocking arm 108 and the fixed arm 112 function as the welding clamp 115, so that the rocking arm linked by the operation of the retract cylinder and the pressurizing cylinder in the actuator body 101 ( As shown in FIGS. 3A to 3C according to the rise and fall of 108, when the electrodes 113 and 114 connected to the rocking arm and the fixed arm are brought into close contact with each other, welding is performed as a work stroke step of performing welding. The clamp 115 is closed (FIG. 3A), and when there is a gap between the electrodes, the welding clamp 115 is slightly open (FIG. 3B) as an approach pre-stroke step immediately before or after welding execution. When a lot of space | interval arises in between, the welding clamp 115 is fully open as a welding completion step (FIG. 3C).

The reason why welding is performed by opening the welding clamp step by step is that it is necessary to open the welding clamp completely at the welding point of the welding target after passing if the welding target is made of a certain height. When the welding clamp is operated in the fully open state to reduce the gap between the electrodes suddenly, it is possible to reduce the gap between the electrodes step by step because of excessive force.

Figures 4a to 4c show front cross-sectional views of actuators for carrying out an approach pre-stroke and a work stroke according to the invention, with figures 4a to 4c in one-to-one correspondence with respective cases of figures 3a to 3c. It shows the operating state of the retract cylinder and the piston of the pressure cylinder.

As shown in the figure, a retract cylinder 118 having a first pressure piston 116 and a pre-stroke piston 117 side by side is arranged at the front side of the actuator body 101 and three second at the rear side thereof. The fourth and fourth pressure pistons 119, 120, and 121 are provided with pressure cylinders 122 arranged side by side at regular intervals, and the third and fourth pressure pistons 120 and 121 of the pressure cylinders are disposed. Rods 123 and 124 are respectively connected to one center of the abutment to abut the other centers of the second and third pressure pistons 119 and 120, respectively, and to the center of the second pressure piston 119. At the same time as penetrating the center of the pre-stroke piston 117 of the retract cylinder 118, while penetrating through the center of the first pressure piston 116 inside the retract cylinder is fixed to the outside of the actuator body 101 Protruding rod 125 is connected, the third and fourth pressure At the same time as the pressure rod 126 together with the rods 123 and 124 connected to the pistons 120 and 121, the outer circumferential surface of one end of the pressure rod is spaced at a predetermined distance along the circumferential surface. A ball insertion groove 127 is formed, and the center of the rods 123 and 124 connected to the third and fourth pressure pistons 120 and 121, respectively, is a hollow portion up to the third and fourth pressure pistons. It penetrates in the form of a part 128.

In addition, in the space between the actuator body 101 and one end of the pressure rod 126, a connecting rod 103, which forms a link connecting hole 104 at one end, is inserted into the space between the actuator body 101 and the retract cylinder 118. Facing the first pressing piston 116, the central portion of the connecting rod 103 forms a cylindrical space portion 131 so that the pressing rod can be inserted, the outer circumferential surface in front of the space portion The pressure member 132 is mounted, and the outer peripheral surface of the rear of the space portion is in close contact with the pressure member while the stopper member 133 is mounted, as a whole, the pressure member to the outer peripheral surface of the pressure rod 126 132 and the stopper member 133 are formed side by side. Here, the pressing member is specifically used a spring or an air cylinder.

The stopper member 133 has a second ball insertion groove 134 formed on the inner circumferential surface of the intermediate portion along the circumferential surface, and the inner circumferential surface of the stopper member and the outer circumferential surface of the pressure rod 126. Some of the parts are in contact with each other and at the same time maintain a constant interval, and within the interval, the first ball insertion of the second ball insertion groove 134 or the pressure rod 126 of the stopper member according to the operation of the actuator. The stopper ball 135 located in the groove 127 is located, and the stopper ball is together with the pressing member 132, the stopper member 133, the first ball insertion groove 127, and the ball insertion groove 134. A stopper mechanism for integrating or separating the pressurizing rod and the connecting rod is provided, and a detailed operation thereof will be described later.

In addition, the air (fluid) inlet and the air (fluid) discharge port and air (fluid) flowing from the outside of the actuator body to the inside so as to inject air or fluid to operate the retract cylinder 118 and the pressure cylinder 122 It forms an outlet.

Such an air inlet, an air outlet, and an air outlet are air inlets (a) for injecting air or fluid into the pressurized cylinder on the upper boundary A between the retract cylinder 118 and the pressurized cylinder 122. Is positioned and connected to the hollow portion 128 in the center of the rods 123 and 124 of the third and fourth pressure pistons 120 and 121, and into the retract cylinder below the boundary surface A. The air inlet (b) for injecting air or fluid is located, and the first of the pressurizing cylinder on the interface (B) between the second pressurizing piston and the third pressurizing piston (119, 120) of the pressurizing cylinder (122) 3 The third air outlet (c) for discharging air or fluid in the pressure piston 120 is located, the air or fluid of the second pressure piston 119 of the pressure cylinder 122 in the lower portion of the interface (B) The second air discharge port (d) for discharging the gas is located.

Subsequently, the air or fluid in the fourth pressurizing piston 121 of the pressurizing cylinder is discharged to the upper portion of the interface C between the third pressurizing piston and the fourth pressurizing piston 120 and 121 of the pressurizing cylinder 122. The fourth air outlet (e) for the position is located, the fourth air outlet (e) together with the third air outlet (c) is always open, on one end (D) of the actuator body (101) The air outlet f for discharging air or fluid of the retract cylinder 118 is located, and finally, on the actuator body E between the interfaces A and D, the first pressure piston in the retract cylinder 118 is located. An air outlet g for injecting or discharging air or fluid for operating 116 is located.

On the other hand, the air inlet or the air outlet except for the third and fourth air outlet (c) (e) is to be opened or closed by the operation of the solenoid valve.

The operating state of the actuator of the present invention configured as described above will be described with reference to FIGS. 3A to 3C and 4A to 4C.

First, when moving to a welding point before welding, as shown in FIG. 4C, the pre-stroke piston 117 of the retract cylinder 118, the 1st press piston 116, and the 2nd thru | or of the pressurization cylinder 122 are shown. The fourth pressing pistons 119, 120 and 121 are closely retracted in close contact with the rear cylinder wall, and the pressing rod 126 is inserted into the space 131 of the connecting rod 103. Only a portion of one end of the connecting rod protrudes out of the actuator body 101, and the stopper ball 135 is inserted into the second ball insertion groove 134 of the stopper member 133, which is shown in FIG. 3C. As shown in the figure, the welding clamp 115 is in a completely open state.

Next, when preparing to weld near the welding point, as shown in FIG. 4B, the air is injected through the air inlet b of the retract cylinder 118 to pre-stroke the piston of the retract cylinder. By advancing 117, only the connecting rod 103 connected to the retract cylinder is advanced, which is shown in FIG. 3B of the oscillating arm 108 connected to the connecting rod by a link 106. This leads to a downward pre-stroke state of the actuator with the welding clamp 115 slightly open.

At this time, the stopper member 133, which is advancing with the connecting rod at the same time as the connecting rod 103 is advanced, is inserted at the position of the first ball insertion groove 127 of the pressure rod 126, and the second ball insertion of the stopper member. The stopper ball 135 inserted into the groove 134 and advancing together is inserted into the first ball insertion groove 127 of the pressure rod, thereby releasing the stopper member, and then closely contacting the front of the stopper member 133. As the stopper member is pushed back slightly by the reaction force of the pressing member 132, the stopper ball 135 is moved out of the second ball insertion groove 134 and the first ball insertion groove 127 of the pressure rod 126. The upper portion of the stopper ball inserted in the state is pressed into the inner circumferential surface of the stopper member 133. Therefore, in such a state, the connecting rod 103 is fixed to the pressure rod 126 from now on so that it can move together with the pressure rod.

Subsequently, when welding is performed at the welding point, air is injected through the air outlet g on the retract cylinder 118 to advance the first pressure piston 116 and at the same time, When the air is injected through the air inlet (a), air is sequentially injected through the hollow portion 128 of the rods 123 and 124 connected to each other, and thus the second to fourth pressure pistons 119 of the pressure cylinder. By advancing the 120 and 121 at the same time, the connecting rod 103 and the pressing rod 126 integrated together are advanced at the same time, as shown in FIG. 3A, the link 106 to the connecting rod. The lower electrode 114 of the fixed arm 112 and the upper electrode 113 of the rocking arm 108 of the welding clamp 115 is connected to the continuous lowering of the rocking arm 108 is connected to the welding point. It is in the working stroke state of the actuators in close contact with each other.

In this state, the welding is performed by the electrode through which the current flows, and a repulsion force that the connecting rod 103 tries to retreat back by the welding is generated in the connecting rod, but the connecting rod is connected to the stopper ball 135. By being integrally fixed together with the pressure rod 126, the connecting rod 103 and the pressure rod 126 can be welded without retreating back against the repulsive force sufficiently.

After the welding is completed, the welding clamp 115 is operated in the reverse order.

That is, the air of the first pressure piston 116 is discharged through the air outlet g, and the air is discharged through the second air outlet d, the third air outlet c, and the fourth air outlet e. By discharging, by simultaneously retracting the second to fourth pressure pistons 119, 120, 121, the connecting rod 103 is simultaneously retracted with the pressure rod 126, which is a link 106 to the connecting rod. To the rise of the swing arm 108 connected to the back, and return to the state of the previous approach pre-stroke, in which the welding clamp 115 is slightly opened, and the swing arm 108 which is in close contact with the welding point of the welding object. The electrodes 113 and 114 of the fixed arm 112 are separated once.

Next, when the air is discharged through the air injection port g to retract the pre-stroke piston 117 of the retract cylinder 118, only the connecting rod 103 is retracted while the pressure rod 126 is fixed. However, by injecting air through the air outlet (f) to the space (S) behind the stopper member 133 to counteract the reaction force of the pressure member 132 to slightly advance the stopper member, the pressure rod ( The stopper ball 135 inserted into the first ball insertion groove 127 of 126 is pulled out so that it is inserted into the second ball insertion groove 134 of the stopper member 133. In this case, the stopper member is connected to the connecting rod ( Simultaneously with 103, which leads back to the raising of the swing arm 108 which is connected to the connecting rod by a link 106 to the original state in which the welding clamp 115 is fully open, The actuator can be completely removed from.

According to the actuator of the present invention having the above objects and configurations, it is possible to appropriately cope with the pressure rod and the connecting rod which are integrated by the action of the stopper member and the stopper ball only when welding. When working, it is possible to solve the problem of repulsive force generated by configuring the pressure cylinder by the multi-stage stroke cylinder, thereby fully utilizing the advantages of the multi-stage stroke cylinder.

In addition, the actuator of the present invention has the advantage that it can be used more safely than the conventional actuator moving up to the cylinder, because only the connecting rod and the pressure rod is moved when welding, the advantage that does not require a separate cylinder guide guide have.

Claims (3)

In the actuator which forms the clamp 115 by the rocking arm 108 and the fixed arm 112, and operates the clamp by the vertical displacement of the rocking arm with respect to the fixed arm, The actuator 100 includes a retract cylinder 118 connected to the body 102 of the clamp 115, and a pressurized cylinder 122 disposed side by side with the retract cylinder so that the center axes thereof coincide with each other. ; The retract cylinder includes a pre-stroke piston 117 and a first pressurizing piston 116 disposed inside the pre-stroke piston and guided on an inner surface of the pre-stroke piston, the first pressurizing The piston has a hollow connecting rod 103 having a connecting hole 104 formed at one end thereof for connecting the rocking arm to the link 106. The pressure cylinder includes an actuator body 101 and second to fourth pressure pistons 119, 120, and 121 arranged side by side in the body 101, and the second pressure piston 119 is the pre- And a pressure rod 126 extending through the stroke piston and the center of the first pressure piston 116 and extending toward the space portion 131 of the connection rod 103, wherein the third pressure piston 120 has a second pressure. The rod 123 abuts on one side of the pressing piston 119, and the fourth pressurizing piston 121 includes a rod 124 abutting on one side of the third pressing piston 120. , The pressing rod 126 of the second pressing piston forms a first ball insertion groove 127 along the axis of the pressing rod 126 on the tip side thereof, Between the connecting rod 103 and the pressure rod 126, a stopper member 133 having a second ball insertion groove 134 formed on a surface facing the pressure rod is disposed, The pressing member 132 is disposed along the inner surface of the connecting rod between the connecting rod and the pressing rod to push one side of the stopper member, Is disposed in the space formed between the pressing rod and the stopper member, and moves between the first ball insertion groove 127 and the second ball insertion groove 134 in accordance with the expansion or contraction of the pressure rod to the first, first 2 An actuator for carrying out a preliminary stroke and work stroke for operating the tool, comprising a plurality of stopper balls 135 insertable into the ball insertion groove. 2. An actuator according to claim 1, wherein said urging member is a spring. An actuator according to claim 1, wherein said urging member is an air cylinder.

Images