JPH0718472Y2 - Open / close cylinder for resistance welding gun device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) In the present invention, a cylinder body is attached to one gun arm and a piston rod protruding from the cylinder body is connected to the other gun arm in order to open and close a pair of gun arms. Open / close cylinder for a resistance welding gun device.

(Prior Art) Conventionally, as an opening / closing cylinder of this type, the actual opening is 61-185584.
As shown in FIG. 4 of the publication, it is known that the stroke can be switched between large and small stages. In this case, a cylinder body a is provided with a first piston b fitted and inserted into the cylinder body a. , A second piston d fitted into a cylinder hole c formed in the first piston b, the cylinder body a is attached to one gun arm e, and the second piston d integrally extends from the other gun arm f. A closing operation that connects the piston rod g and introduces pressure air into the first pressure chamber h on the first piston b side of the cylinder body a and the second pressure chamber i on the second piston d side of the cylinder hole c; First
The pressure chamber h and the third cylinder body a on the piston rod g side
The pressure air is introduced into the pressure chamber j and the second piston d moves to the first
A small opening operation that operates to the left in the drawing with respect to the piston b,
The pressure air is introduced into the third pressure chamber j so that the first piston b
Is provided to both of the gun arms e and f such that the left and the second piston d are respectively opened to the left with respect to the first piston b.

(Problems to be Solved by the Invention) In the above-mentioned conventional one, the pressurizing force of both gun arms e and f is given only by the second piston d, and for welding aluminum materials or the like requiring a large pressurizing force. , The cylinder has to be quite large.

Moreover, the cylinder hole c formed in the first piston b is
When the piston d is inserted, the diameter of the cylinder is increased by the thickness of the peripheral wall of the first piston b.

An object of the present invention is to provide an opening / closing cylinder having a relatively small diameter and capable of generating a large pressing force.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a cylinder rod is attached to one gun arm and a piston rod is protruded from the other cylinder arm to open and close a pair of gun arms. An opening / closing cylinder for a resistance welding gun device, in which the strokes are switchable between large and small stages, two cylinder holes are formed adjacent to the cylinder body in the axial direction, A first piston fitted into the cylinder hole and a second piston fitted into the other cylinder hole, the first piston is fixed to the piston rod, and the piston rod has a pair of stopper steps. Are formed at intervals, and the second piston is slidably attached to the piston rod while being positioned between the stopper step portions.

(Operation) By setting the interval between both stopper steps so that the stroke of movement of the second piston with respect to the piston rod is shorter than the stroke of operation of the first piston, the piston rod tail end side of both cylinder holes By introducing pressure air into the pressure chambers respectively, the second piston is moved to the tip end side with respect to the piston rod and abuts on the stopper step portion, and the piston rod is extended to the extension side via the first and second pistons. It is activated and both gun arms are closed.

Also, by introducing pressure air into the pressure chamber on the piston rod tip side of the one cylinder hole into which the first piston is inserted, the piston rod is actuated toward the contraction side via the first piston, and both gun arms open wide. The second piston is moved toward the tail end side with respect to the piston rod by introducing pressure air into the pressure chamber on the piston rod tip side of the other cylinder hole into which the second piston is inserted and the stopper step is performed. And the piston rod is actuated toward the contracted side via the second piston to a stroke shorter than the stroke due to the operation of the first piston, so that both gun arms are in a small open state.

In this case, the pressure applied to both gun arms is
It is given by a piston and a large pressure can be obtained by a cylinder having a relatively small diameter.

Also, each of the first and second pistons is
Since the cylinders are inserted into the individual cylinder holes, the diameter of the cylinder can be reduced by the thickness of the peripheral wall of the second piston, as compared with the conventional one.

(Embodiment) Referring to FIGS. 1 to 3, (1) is a cylinder body,
(2) shows a piston rod protruding from the cylinder body (1), and an upper movable gun arm (4) and a lower fixed gun arm (5) are provided between a pair of left and right gun brackets (3) and (3). The piston rod (2) is connected to the tail end of the movable gun arm (4) through a pin (6), and the cylinder body (1) is centered on both brackets (3) and (3). The cylinder body (1) is connected to the fixed gun arm (5) through the gun bracket (3), and the movable gun arm (4) is fixed to the fixed gun arm (5). ), The piston rod (2) can be swung to the open side by the expansion side operation and the contraction side operation.

In the cylinder body (1), two are arranged adjacent to each other in the axial direction.
Individual cylinder holes (8) and (9) are formed, and a first piston (10) fitted into one cylinder hole (8) and a second piston (11) fitted into the other cylinder (9). Is provided, and the first piston (10) is tightened and fixed to the piston rod (2) by a nut sleeve (12) screwed to the outer periphery thereof, and the first piston (10) is fixed to the piston rod (2).
A pair of stopper step portions composed of an end surface (12a) of the nut sleeve (12) and a washer (14) fixed to the tail end portion of the piston rod (2) by a screw (13) are provided, and the piston The second piston (11) was slidably mounted on the rod (2) while being positioned between the end face (12a) and the washer (14).

The operation strokes L ₁ and L ₂ of the first and second pistons (10) and (11) for the cylinder holes (8) and (9) are the same, and the end surface (12a) of the nut sleeve (12) and the washer (14) are ), The movement stroke L ₃ of the second piston (11) with respect to the piston rod (2) is the first piston (10).
Set so that it is shorter than the operating stroke L _{1 of} .

In addition, the cylinder cover (1
a) The first on the second piston (11) side of the cylinder hole (9)
Opened an air port (15a) that communicates with the pressure chamber (15),
One end of the piston rod (2) is open to the peripheral surface of the nut sleeve (12) and the other end is the piston rod (2).
A communication passage (16) opened at the tail end of the cylinder is bored so that the second pressure chamber (17) on the first piston (10) side of the cylinder hole (8) is connected to the first pressure chamber (15). The cylinder rod (2) side of the cylinder hole (8) in which the first piston (10) is fitted in the cylinder cover (1b) on the upper side of the cylinder body (1) is made to communicate with each other through the communication passageway (16). An air port (18a) communicating with the third pressure chamber (18) and a fourth portion on the piston rod (2) side of the cylinder hole (9) in which the second piston (9) is fitted and included in the peripheral wall of the cylinder body (1). An air passage (19a) communicating with the pressure chamber (19) is provided in each.

Thus, by introducing pressure air into the first and second pressure chambers (15) and (17) of both cylinder holes (8) and (9), the second piston (11) moves relative to the piston rod (2). Contact the end surface (12a) of the nut sleeve (12), and the piston rod (2) causes the first and second both pistons (10) (11).
Is actuated to the extension side via the (the first illustrated state), both gun arms (4) and (5) are closed, and the third pressure in the cylinder hole (8) in which the first piston (10) is fitted is inserted. By introducing pressure air into the chamber (18), the piston rod (2) is actuated to the contraction side via the first piston (10), and both gun arms (4) and (5) are in a wide open state (first). 2 state shown).

Further, by introducing pressure air into the fourth pressure chamber (19) of the cylinder hole (9) into which the second piston (11) is inserted, the second piston (11) strokes with respect to the piston rod (2). It moves by L ₃ and contacts the washer (14), and the piston rod (2) is moved by the stroke L ₂ -L _{3 to the} contraction side via the second piston (11), and both gun arms (4) (5) Becomes a small open state (state shown in FIG. 3).

(Effect of the Invention) As described above, according to the present invention, the stroke can be switched between large and small stages, and the pressurizing force of both gun arms is given by the first piston and the second piston. Since a large pressing force can be obtained and the structure in which the first and second pistons are inserted into the respective cylinder holes of the cylinder body, the peripheral wall thickness of the first piston is smaller than that of the conventional one described above. Has the effect that can.

[Brief description of drawings]

FIG. 1 is a cutaway side view of an essential part of a resistance welding gun device equipped with an opening / closing cylinder of the present invention, FIGS. 2 and 3 are cutaway side views showing their operating states, and FIG. 4 is a view of a conventional example. It is a cutaway side view of a part. (1) …… Cylinder body, (2) …… Piston rod (4) …… Movable gun arm, (5) …… Fixed gun arm (8) (9) …… Cylinder hole, (10) …… First piston ( 11) …… Second piston (12a) …… End surface of nut sleeve (stopper step) (14) …… Washer (stopper step)

Claims (1)

[Scope of utility model registration request] 1. An opening / closing cylinder for a resistance welding gun device, wherein a cylinder body is attached to one gun arm and a piston rod protruding from the cylinder body is connected to the other gun arm in order to open and close a pair of gun arms. , The stroke can be switched between large and small stages, in which two cylinder holes are formed in the cylinder body so as to be adjacent to each other in the axial direction, and the first piston and the other cylinder hole are fitted into one cylinder hole. A second piston to be inserted into the piston rod, and the first piston is fixed to the piston rod, and a pair of stopper step portions is formed on the piston rod with a space therebetween. An opening / closing cylinder for a resistance welding gun device, characterized in that a second piston is positioned between the stopper steps and slidably mounted.