KR20130044598A - Welding clamp - Google Patents

Abstract

PURPOSE: A welding clamp is provided to apply a large welding force when welding a high tensile steel sheet. CONSTITUTION: A welding clamp includes a dented part and a chuck part(10). The dented part is formed on a working rod(711). The chuck part is integrally formed at the rear side of an actuating rod.

Description

Welding clamps {WELDING CLAMP}

The present invention relates to a welding clamp used for spot welding, by which the working fluid supplied to the pressing force applying means is supplied to the chucking means through a bypass structure peculiar to the present invention, thereby significantly reducing the volume of the device, and in particular, high tensile steel sheet. The present invention relates to a welding clamp which can exert a large pressing force during welding and at the same time improves the operation reliability.

Conventional spot welding weld clamps are provided with + electrodes and-(ground) electrodes at the ends of two arm portions connected to form a C-shape, respectively.

When the pressing force applying means is added to this welding clamp, the bonding force of the steel sheet can be further improved by welding while pressing the sheet.

The pressing force applying means is integrally coupled with the welding clamp, and is configured by linking one or both arms of the clamp so that the linear movement of the drawing rod acts as the pressing force, and the linear movement of the drawing rod is made of pneumatic or hydraulic cylinder and By a solenoid valve and a fluid pump.

The pneumatic cylinder is composed of a number of parts. Looking at the components of the cylindrical tube body for guiding linear motion and the piston (Rod) and rod (Rod), which delivers energy directly to the transfer object, supply of compressed air Or two covers having a port for exhaust.

These two covers are divided into a head cover on the piston side and a rod cover on the rod side, and a gasket or packing is inserted into the piston and various friction movement parts to prevent air leakage. To keep it confidential.

In addition, it consists of a tire rod and nut (Nut) for fixing the tube and the cover.

The pneumatic cylinder supplies compressed air to the internal piston to obtain the required drive output. When the compressed air is supplied to one cover port and the compressed air is discharged to the outside through the port of the other cover, the air is discharged. The piston moves toward the end to complete the stroke movement.

On the contrary, when the air supply side is exhausted and compressed air is supplied to the exhaust side, the piston moves in the opposite direction to complete the stroke movement, which is called the reciprocating movement of the cylinder. The movement of the piston and the rod toward the rod cover is called forward. The movement to the head cover is called reverse. As the cylinder moves forward and backward, kinetic energy is generated due to the weight and speed of the load.

By the way, the conventional welding clamp was only able to open and close the operation pattern of the two arms, that is, large open cod mode and pressure mode, in this case, it is difficult to apply various types of welding process to various welding objects It was inconvenient, especially in the case of welding which is continuously carried out in a plurality of places at regular intervals while moving along a long welding section, a lot of time is consumed in opening and closing the arm, which causes a decrease in productivity.

The Applicant adds a working rod between the withdrawal rod (hereinafter referred to as the working rod) and the pressure rod so that the two arms can be divided into two stages, namely, large open cod mode and small open globule mode. In addition, the draw rod and the walking rod can be adjusted to a plurality of stages of the withdrawal of the withdrawal rod by combining or releasing as necessary, and thus, the present invention provides a small opening mode.

At the coupling point of the lead rod and the walking rod, a concave groove is formed in each of the lead rod and the walking rod, and a ball member is interposed therebetween to control the position of the ball member, thereby engaging or releasing the lead rod and the walking rod. Controlled.

However, the related art has a problem in that a high durability is required for the ball member, and a malfunction of the entire cylinder is caused when the ball member is broken due to reduced durability.

Applicant has devised the present invention to solve the problems of the prior art, the present invention applied a chucking means for coupling or releasing the withdrawal rod and the working rod, a separate external operating means for the operation of the chucking means By-pass means can be utilized to utilize the working fluid that operates the lead-out rod and the walking rod without the need to add additional parts, thereby reducing the number of failures and maintenance caused by the increase in the number of parts. It is possible to increase the reliability of the division operation, which contributes to the improvement of the productivity, and also the compact construction of the chucking means reduces the volume of the device, and in particular, the welding clamp which can exert a large pressing force in the welding of high tensile steel sheet. It is provided for that purpose.

In order to achieve the above object, the welding clamp of the present invention has a long body of a straight or curved shape, one end of each body is linked to each other so as to allow relative movement away from each other and the electrode at each end Supplying the upper arm portion and the lower arm portion, one of the upper arm portion and the lower arm portion, an actuating rod linked and moved forward and backward to enable the relative movement, and driving force of the advancing and advancing the actuating rod. And an actuator in which the upper arm portion and the lower arm portion are installed to support the relative motion, and are detachably coupled to the same axis at the rear of the operating rod, and moved by a working fluid in a cylinder included in the actuator. A working rod integrally connected with the piston, and a sole for controlling the supply or withdrawal of the working fluid to the cylinder A welding clamp comprising a nose and a pump for supplying a working fluid to the solenoid, which is formed integrally with a recess formed on the working rod and the rear of the working rod, and is perpendicular to the forward and backward directions of the working rod. Up and down in the direction is made of a chuck (chuck) that is engaged or released in the recess.

In addition, in the present invention, the chuck portion, the body is formed with a hole through which the walking rod, a plurality of chuck cylinder formed in the body, and integrally provided in the chuck cylinder is perpendicular to the forward and backward direction of the walking rod And a locking pass and a release pass, respectively connected to the front and rear of the chuck cylinder, for supplying a piston chuck lifting in the direction and a working fluid for operating the piston chuck.

In addition, in the present invention, the working rod, the flow path of the working fluid formed perforated along the center in a portion of the longitudinal direction, and the inlet of the flow path formed at a position that is open to the cylinder in the rear of the forward direction of the wicking rod and And an exit of the flow path formed at a position to be connected to the locking path when the walking rod is coupled to the chuck portion in a forward direction of the walking rod, and from the leading end of the walking rod to the chuck portion in the chuck portion. When it is coupled is composed of a concave and elongated groove formed on the outer circumferential surface of the walking rod to the position connected with the release path.

In addition, in the present invention, the moving partition which is slidably fitted on the working rod and acts as a piston in the cylinder is further added, and the movement of the inlet of the flow path in accordance with the movement of the moving partition by the control of the solenoid valve. Can open and close.

Also, in the present invention, a plurality of pressurizing cylinders and rods are added to press the working rods coaxially from the rear side.

The present invention applies a chucking means for coupling or releasing the working rod and the working rod, and the working fluid for operating the working rod and the working rod without the need for the addition of a separate external operating means for the operation of the chucking means. By-pass means can be utilized to reduce the number of breakdowns and maintenance caused by the increase in the number of parts, and to increase the reliability of the operation of the separate operation of the small and the cod mode, which can greatly contribute to productivity. In addition, by utilizing the working fluid utilized for cylinder operation by the bypass means without the addition of a separate working fluid supply / discharge means for the operation of the chucking means, the volume of the device is greatly reduced, and especially when welding high tensile steel sheet. It has an excellent effect of exerting great pressure.

1 is a side view showing a pressing mode of a welding clamp.
Fig. 2 is a side view showing the globule mode of the welding clamp.
3 is a side view showing a cod mode of a welding clamp.
4 is a schematic cross-sectional circuit diagram and a partial enlarged view for explaining a pressurizing mode of a weld clamp actuator according to the present invention.
Fig. 5 is a schematic sectional circuit diagram and a partial enlarged view for explaining an appealing mode of a welding clamp actuator according to the present invention.
6 is a schematic cross-sectional circuit diagram and a partial enlarged view for explaining a cod mode of a welding clamp actuator according to the present invention.
It is a schematic sectional drawing which shows the chuck | zipper part by one Embodiment to which this invention was preferably applied.

Embodiments to which the present invention is preferably applied are described in detail below with reference to the drawings.

The welding clamp 1 in this embodiment is any one of the upper arm part 2 and the lower arm part 3, the upper arm part 2, and the lower arm part 3 which are linked and opened linkably in the form of tongs. An actuating rod 7 which is linked to one arm to enable opening and closing and pressurizing operation, and a body for supporting the two arm portions 2, 3, while the actuating rod 7 and the actuating rod 7 It is composed of an actuator (6) with built-in cylinders to move forward and backward.

The upper arm portion 2 and the lower arm portion 3 are also referred to as C-shaped clamps because the link-connected shape forms an overall C shape, and electrodes are provided at both ends of the upper arm portion 2 and the lower arm portion 3, respectively. (4, 5) is provided, and spot welding can be performed in the state which pressed the metal plate material to be welded.

In this embodiment, the upper arm part 2 is linked to the actuator 6, and the connection angle of the upper arm part 2 and the operating rod 7 changes according to the withdrawal degree of the actuating rod 7, Spot welding by the arm part 2 and the lower arm part 3 is performed.

Hereinafter, the case where the connection angle between the upper arm portion 2 and the actuating rod 7 is the smallest so that the upper arm portion 2 and the lower arm portion 3 abut together is called a pressing mode, and the connection angle is the largest The case where the arm part 2 and the lower arm part 3 are greatly opened is called a cod mode, and the case where the connection angle is about medium is called a small mouth mode.

The interior of the actuator 6 which enables the division execution as such a pressurization mode, an appealing mode, and a cod mode is largely divided into working regions L1 to L3 and pressurization regions L4 to L6, and these are individually Ports a1 to a3, b1, b2, and c1 to c3, which are in / out passages of compressed air, which are working fluids, are provided to correspond to each other, and the ports a1 to a3, b1, b2, and c1 to c3 are provided. First to third solenoid valves 91 to 93 for distributing and supplying a working fluid, and a controller (not shown) for controlling the same, are integrally provided in the actuator 6.

The working regions L1 to L3 include an actuating rod 7 which is fired forward and backward, a actuating rod 711 coupled to and detachably coupled to the actuating rod 7 to impart a pressing force from the rear thereof. The pressing piston 71 and the chuck 10 for detachably coupling the operating rod 7 and the pressing rod 711. The actuating rod 7 is integrally coupled with the chuck 10 with the actuating piston 12 interposed therebetween, and the coil is fitted to the actuating rod 7 so that an elastic force acts in the direction in which the actuating rod 7 is received. A spring 13 is located between the actuating piston 12 and the front inner wall 19.

In addition, the inner diameter of the second cylinder 62 is made larger than the inner diameter of the first cylinder 61 in the working regions L1 to L3 so that the two cylinders are separated by the step jaw, and the section of the second cylinder 62 is located. In L2, a hole into which the working rod 711 is fitted is formed at the center thereof, and a moving partition 14 sliding in the front-rear direction is provided.

The moving partition 14 slides on the working rod 711. When the compressed air is supplied to the second cylinder 61 while the compressed air is supplied through the port a2, the moving partition 14 moves forward. The hole inlet 713 formed in the circumferential surface of the walking rod 711 is opened to lead to the center hole 712 formed at the center of the walking rod 711, so that the compressed air of the second cylinder 62 is opened in the center hole. Flows into 712. Compressed air introduced into the center hole 712 locks the chuck 10 so that the operating rod 7 and the walking rod 711 are coupled to each other, which will be described later in more detail.

On the other hand, the pressurizing regions L4 to L6 press the first press rod 72, the second press rod 73, the third press rod 74, and the respective pressurizations to press the working rod 711 from the rear side. Rods 72 to 74 are formed of fourth to sixth cylinders 64 to 66 that operate individually. Each of the fourth to sixth cylinders 64 to 66 is provided with a port c1, a port c2, and a port c3, and a port c4 is provided at a rear side of the sixth cylinder 66.

Each of the first to third pressing rods 72 to 74 has first to third drilling holes 721, 731 and 741 formed along a center thereof, and each of the first to third drilling holes 721, 731 and 741 is continuously connected to the same axis. Each of the drill holes 721, 731, 741 is provided to allow the flow of compressed air to the third cylinder 63, the fourth cylinder 64, and the fifth cylinder 65, respectively, at the forward end thereof. The hole 741 is communicated with the sixth cylinder 66 at the leading end in the reverse direction.

Therefore, when compressed air is applied to the port b2 by the operation of the second solenoid valve 92, the air pressure of the third cylinder 63 rises and the walking rod 711 advances, and then into the first drilling hole 721. As the compressed air introduced flows into the fourth cylinder 64, the first pressure rod 72 moves forward. Then, the compressed air introduced into the second boring hole 731 flows into the fifth cylinder 65 while the second compressed air flows into the fifth cylinder 65. The pressurizing rod 73 advances, and then the third pressurizing rod 74 is advanced while the compressed air flowing into the third drilling hole 741 flows into the sixth cylinder 66. At this time, the ports c1, c2, c3 are operated by the solenoid to lower the internal air pressure.

In the pressurizing mode, all the pistons of the working regions L1 to L3 and the pressing regions L4 to L6 are advanced, and the working rod 7 and the working rod 711 are locked by the chuck 10. do.

On the other hand, in the cod mode, all the pistons are reversed, the working rod 711 is unlocked from the chuck 10, and the working rod 7 is retracted as much as possible by the coil spring 13.

In addition, in the globule mode, the pistons of the pressurized regions L4 to L6 retreat, the moving partition 14 is advanced, and compressed air is supplied to the center hole 712 of the walking rod 711 so that the chuck 10 is closed. By the lock rod of the working rod 7 and the working rod 711 is maintained, only the working rod 711 is reversed.

The globule mode includes the upper arm portion 2 and the lower arm portion 3 so as to facilitate spot welding at a plurality of locations continuously while moving the welding clamp 1 along the edge of the metal plate to be welded. As the distance is slightly extended, the pressurization mode and the globule mode are alternately repeated during the welding operation.

In more detail with respect to the operation of the chuck 10, which can be said to be the difference between the globule mode and the cod mode, the chuck 10 belonging to the working regions L1 to L3 is the operating rod 7; And the locking rod 71 in the axial direction to enable or release.

The chuck 10 is integrally connected with the actuating rod 7 with the actuating piston 12 interposed therebetween, and itself consists of a cylindrical body having a through hole in its center. The cylindrical body has a chuck cylinder built up and down as shown in FIG. 7.

The chuck cylinder is provided with in / out ports of compressed air at upper and lower ends, respectively, in the vertical operation direction of the piston chuck 11, and a port of the rear side of the piston chuck 11 is provided with a lock air passage 15. ) Is connected, the port in the front of the piston chuck 11 is connected to the release air passage (18).

The lock air passage 15 is formed in the cylindrical body of the chuck 10, and the plurality of lock air passages 15 join at one point to form one passage and extend toward the center of the body to extend the ends thereof. Is opened in the through hole.

In addition, compressed air is supplied to an extended end of the lock air passage 15 through a compressed air outlet formed on an outer circumferential surface of the walking rod 71 that slides into a through hole of the cylindrical body. Is located at the front side of the walking rod 71 as a hole which is radially bent outward from the center hole 712 formed by being elongated and drilled along an approximately central axis of the walking rod 71.

On the other hand, an inlet 713 is formed in the rear side of the walking rod 71 is a hole bent in the radial direction from the center hole 712 to the outside, as shown in Figure 4, the inlet ( 713 is located at a rear side close to the rear surface of the movable partition 14, and in the pressurized mode and the globule mode, the compressed air introduced from the inlet 713 together with the air pressure rise of the second cylinder 62 is provided in the air passage ( 712 is supplied to the lock air passage 15, and in the cod mode, the moving partition 14 backwards and closes the inlet 713 to stop supplying compressed air to the center hole 712. . At this time, as will be described later, while the compressed air is supplied to the first cylinder 61 through the port a1, the piston chuck 11 is opened through the groove 715 and the release air passage 18, and thus , The release operation of the chuck 10 is completed.

The release air passage 18 is formed in the cylindrical body, and in the cross section of FIG. 7, the lock air passage 15 is disposed on the side opposite to the lock air passage 15 around the piston chuck 11. Of course, the position or arrangement can be appropriately selected if they do not overlap with. The plurality of release air passages 18 also join at one point to form one passage and extend toward the center of the body so that the extended end is opened in the through hole.

At the extended end of the release air passage 18, as shown in FIG. 7, a groove 715 is formed to be concave and elongated on the outer surface of the walking rod 71, and the front of the walking rod 71 is formed. The compressed air supplied from the side end is supplied to the release air passage 18 through the groove 715.

Therefore, when compressed air is supplied through the lock air passage 15, the plurality of piston chucks 11 are tightened toward the center, and the sliding slid into the through-holes of the cylindrical body of the chuck 10 is walking. Coupled to the concave groove 714 formed in the front portion of the rod 71, on the contrary, when compressed air is supplied through the release air passage 18, a plurality of piston chucks 11 are separated from the center, so that the concave By releasing from the groove 714, unlocking is executed.

In the present embodiment, compressed air is employed as the working fluid. However, the present invention is not limited thereto, and the actuator can be formed as a hydraulic cylinder by employing a pressurized oil to obtain a larger pressing force according to the working scale.

In the present embodiment, an example in which openings formed by the upper arm portion 2 and the lower arm portion 3 are formed in the horizontal direction has been described. However, the present invention is not limited thereto, and the two arm portions 2 and 3 are described. It will be understood by those of ordinary skill in the art that a design change for relocating the link mechanism and the pressing means so as to raise or lower the opening direction of the opening is possible within the scope of the present invention.

1: welding clamp 2: upper arm part
3: lower arm portion 4, 5: electrode
6: actuator 7: working rod
8: connecting part 10: chuck
14: moving bulkhead

Claims (5)

An upper arm portion and a lower arm portion having a straight or curved long body and having one end connected to each other so as to allow relative movement away from each other and to be moved relative to each other, and having electrodes at one end; And an actuating rod that is linked and moved forward and backward to the one of the lower arm portions, and supplies driving force of the advancing and advancing to the actuating rod, and the upper arm portion and the lower arm portion support the relative movement. An actuator installed to be received, a working rod detachably coupled to the same axis at the rear of the working rod, integrally connected to a piston moving by a working fluid in a cylinder included in the actuator, and a working fluid to the cylinder. A solenoid for controlling the supply or withdrawal of a pump and a pump for supplying a working fluid to the solenoid As a welding clamp made of,
A recess formed on the working rod,
And a chuck unit integrally formed at a rear side of the actuating rod and configured to be chucked to be engaged or released from the recess by moving up and down in a direction perpendicular to the forward and backward directions of the actuating rod. The method of claim 1,
The chuck section,
A body having a hole through which the walking rod is formed;
A plurality of chuck cylinders formed in the body,
A piston chuck which is integrally provided in the chuck cylinder and lifts in a direction perpendicular to the forward and backward directions of the working rod,
Weld clamp, characterized in that for the supply of the working fluid for operating the piston chuck, consisting of a locking pass and a release path respectively connected to the front and rear of the chuck cylinder. The method of claim 2,
The walking rod is,
A flow path of the working fluid formed in the longitudinal section along the center thereof,
An inlet of the flow path formed at a position that is open to the cylinder at the rear of the forward direction of the wicking rod;
An outlet of the flow path formed at a position connected to the locking path when the walking rod is coupled to the chuck in a forward direction of the walking rod;
And a recess formed on the outer circumferential surface of the walking rod from a forward end of the walking rod to a position connected with the release path when the walking rod is coupled to the chuck portion. The method of claim 3,
A movable partition which is slidably fitted on the working rod and acts as a piston in the cylinder,
The welding clamp, characterized in that the inlet of the flow path can be opened and closed in accordance with the movement to the movable partition by the control of the solenoid valve. The method according to any one of claims 1 to 4,
And a plurality of pressure cylinders and rods are added to press the working rods coaxially from the rear.

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