JPH0428659Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial field of application> This invention is used when attaching the mold of an injection molding machine or press machine to a base, etc., and multiple clamp rods that act as clamps are used at the same time when replacing the mold. The present invention relates to a type of clamp device that swings to a retracted position without any interference.

<Conventional technology> Conventionally, when fixing a wide mold to a base,
The mold was fixed using a plurality of clamping devices placed at appropriate intervals on the clamped portion of the mold. For example, the clamping device used for this purpose was
-There are some disclosed in No. 6523. it is,
As shown in FIG. 6, a clamp rod 4 is swingably connected to a piston rod 3 of a cylinder device 2 attached to the main body 1 via a shaft 5. The mold 7 is tightened and fixed to the base 6 as shown in FIG. 3 moves forward, the trochanter 8 provided on the clamp rod 4 is guided by the guide 9 provided on the main body 1, and the clamp rod 4 returns to the left side in the figure and rotates around the shaft 5 against the tensile force of the spring 10. It swings to an angle θ and reaches a predetermined retreat position. When the piston rod 3 retreats, it returns from the retracted position to the loosened position by the return force exerted by the return spring 10, and as the piston rod 3 further retreats, the trochanter 8 moves toward the member 1.
1, the clamp rod 4 is guided to a predetermined clamping position, and the clamp rod 4 is in a clamped state. This clamping device is used by being provided at a location where clamping is required, and even if there is a plurality of clamping devices, each device is configured independently.

<Problems to be solved by the invention> In this conventional swing type clamp device, the return spring 10 is provided to ensure that the clamp rod 4 returns from the retracted position to the loosened position. When trying to increase the angle θ, there was a problem that the return spring 10 did not fit properly. Because of this problem, it is almost impossible for conventional clamping devices of this type to have a large swing angle, for example 80 degrees, and therefore, depending on the application, it is difficult to obtain a good retracted state of the clamp rod. There were some drawbacks that I couldn't overcome. Further, a cylinder device 2 using a single hydraulic cylinder is used to advance and retreat the clamp rod 4 in a linear direction and to swing the clamp rod 4 about the axis 5, and its stroke is used for the stroke for advancing and retreating the clamp rod and for the swinging motion of the clamp rod. It is in harmony with the stroke. For this reason, in applications where it is desired to make the cylinder device as short as possible, both the stroke for advancing and retracting the clamp rod and the stroke for swinging must be made small, but there is a problem that it is not always possible to make the cylinder device sufficiently short.

<Means for Solving the Problems> The present invention provides a clamp cylinder in which a clamp rod is formed as an extension following the piston in the cylinder and has an engaging part for a clamped part at the tip, and a clamp rod in a direction perpendicular to the axis of the cylinder. A plurality of clamp devices each having a main body having a shaft protruding from both sides of the outer surface of the cylinder and swingably supporting the clamp cylinder via the shaft are connected so that the shafts can transmit rotation to each other, and It is formed by connecting dynamic drive devices.

<Function> For example, when fixing a wide mold to a predetermined base surface, this clamping device holds the mold by placing a U-groove spanning the edge of the mold and the end of the base at a predetermined interval. A plurality of clamp rods are provided in the direction perpendicular to the edge of the U-groove, and the clamp rod of each clamp tool passes through the U-groove so that the engaging part is located at the U-groove end of the mold and the cylinder is located at the U-groove end of the base. In addition, each main body is fixed to the base so that each clamp cylinder swings simultaneously and the clamp rod is removed from the U-groove of the mold. When the clamp cylinder is shortened while the clamp rod of the clamp cylinder is in the U-groove, the engaging portion comes into contact with the mold and presses it toward the base, creating a clamped state. In the open state where the clamp cylinder is extended, the swing drive device swings the connecting shaft connected to the shafts protruding from both sides of the outer surface of the cylinder, thereby swinging the projecting shaft of the cylinder and the clamp cylinder integrated with it. This oscillation is transmitted one after another to the next connecting shaft, and the clamp cylinders can be swung so that the clamp rods of all the clamp cylinders to which the connecting shafts are connected are removed from the U-groove of the mold. The mold can be moved depending on the position.

<Example> An example of this invention will be described with reference to FIGS. 1 to 5. This swing-type clamp device has a plurality of clamp devices, and one of them, as shown in FIGS. 1 and 3, consists of a main body 20 and a clamp cylinder 21.

The main body 20 includes an upper wall portion 24 fixed along the back surface of the end portion 52 of the base plate 23 to which the mold 48 is fixed, and an upper wall portion 24 provided parallel to each other at right angles downward from both ends of the upper wall portion 24. The left and right side wall portions 25 and 26 are continuous and approximately U-shaped. This left and right side wall portion 2
A clamp cylinder 21 is provided between 5 and 26 as shown in FIG.

The clamp cylinder 21 is constituted by, for example, a hydraulic cylinder, and swing shafts 30 and 31 protrude outward from the outer surface of the cylinder on both sides of the diameter line of the cylinder 28.
Reference numerals 0 and 31 extend through the left and right side walls 25 and 26 of the main body 20 to swingably support the clamp cylinder 21, and at the tips of the swing shafts 30 and 31 there is a connecting portion that can be connected to the connecting shaft 33. 36 are provided.
A piston 29 is housed in the cylinder 28, and when pressure oil is supplied to the upper chamber partitioned by the piston 29, the piston 29 is pushed down and the clamp rod 22 is lowered, and when the oil pressure is removed, the spring 45 is Then move the piston 29 into the cylinder 28.
Push up to the upper position inside the clamp rod 22.
It is also a rising structure. Clamp rod 22 is
The distal end portion has an engaging portion 27 for engaging the clamped portion 50 of the mold 48, and the base end portion 32 on the cylinder side is screwed and coupled to the piston 29.

The above-mentioned clamp devices constitute a swing type clamp device with a plurality of the clamp devices and one swing drive device 35, and as shown in FIG.
A plurality of clamp devices are attached along the end portion 52 of the clamp device 3, and the respective swing shafts 30, 31 of the clamp devices are connected by a connecting shaft 33 to transmit rotation.
A connecting shaft 33a connected to the swinging shaft 31 of the clamp device at the right end in FIG. A connecting shaft 33a is attached to the right end of the shaft 33a.
An arm 37 is connected in a direction perpendicular to the .

The swing drive device 35 is composed of the arm 37 and an air cylinder 42. The tip of the piston rod 43 of the air cylinder 42 is connected to the connecting shaft 3.
The connecting shaft 33a is rotatably connected to the distal end of the arm 37 connected to the arm 33a, and is attached so that the connecting shaft 33a can be rotated by moving the piston rod 43 forward or backward. This air cylinder 42 is the fourth
As shown in the figure, a pin 5 is attached to the opposite end of the piston rod 43 at a position parallel to the right end surface 51 of the base 23.
The air cylinder 42 is pivotally supported on the right end surface 51 through the air cylinder 6 and can rotate along the right end surface 51.

This swing type clamp device is used when a wide mold 48 is fixed to the base surface, and
A plurality of U-grooves 49 are provided at predetermined intervals in a direction perpendicular to the edge of the mold 48, spanning the edge of the mold 8 and the end of the base, corresponding to the clamping points. The clamp rods 22 of each clamping device pass through so that the engaging portion 27 is located at the U-groove end of the mold 48 and the cylinder 28 is located at the U-groove end of the base 23.
In addition, each main body 20 is fixed to the base 23 side so that each clamp cylinder 21 swings simultaneously and the clamp rod 22 is removed from the U groove of the mold 48.

1 and 2 show the clamped state of the mold 48. To explain the operation of this device from the state in which the mold is removed from the clamp rod until it is clamped, the swinging air cylinder 42 is attached to the piston rod. 43 from the retreated position and move arm 3 forward.
7, the engaging portion 27 of the clamp rod is swung from the retracted position shown by the imaginary line in FIG. 1 to a position parallel to the clamped portion 50 of the U-groove edge of the mold 48. do. When pressure oil is supplied to the clamp cylinder 21 in this position, the clamp rod 22 retreats downward from the forward position shown by the imaginary line in FIG.
This is pressed against the upper surface of the base 23 to fix the mold. In this way, the other clamp cylinders 21 operate in the same manner, and the mold 48 is brought into a clamped state.

When replacing the mold next time from this clamped state, when the hydraulic pressure of each clamp cylinder 21 is removed, the clamp rod 22 moves upward and releases the engaging part 27 from the clamped part 50. When the swinging air cylinder 42 is shortened, the arm 37 rotates together with the piston rod 43, thereby swinging the clamp cylinder 21 to the retracted position. The mold is replaced at this stopped retracted position, and the swing angle is approximately 30 degrees.

In the above embodiment, the swing drive device was configured to swing the clamp cylinder by rotating the arm connected to the connecting shaft by moving the air cylinder forward and backward, but other structures may be used.
For example, the clamp cylinder may be oscillated by coupling the rotating shaft of the rotary actuator to the connecting shaft and rotating the connecting shaft with the rotating shaft. Also, a connecting shaft was used to connect the swinging shafts to transmit the rotation, but if the swinging axes of the respective clamp cylinders are not in a straight line, a universal joint can be installed at the intermediate position of the connecting shafts. Rotation can also be transmitted to the neighboring clamp cylinder.

Further, in this embodiment, the piston rod of the air cylinder of the swing drive device is arranged so as to face downward from the base as shown in Fig. 5, but the base is thin and there is no space for the piston rod to swing the arm. If there is space above the mold side for swinging the arm, the rod can also be placed on the upper side.

The oil supply and drainage passage of the clamp cylinder may be an oil supply and drainage passage that leads from the opening 53 on the front of the cylinder to the upper chamber inside the cylinder, as shown by the imaginary line in FIG. It may be an oil supply/drainage path leading from the opening 54 to the upper chamber in the cylinder through the rotary joint 55 of the right-side swing shaft, or it may be an oil supply/drainage path leading from the opening 54 to the upper chamber in the cylinder, or alternatively, it may be an oil supply/drainage path leading from the opening 54 to the upper chamber of the cylinder through the rotary joint 55 of the right-side swing shaft. An opening and a rotary joint are provided on each of the left and right swing shafts, and one of these openings is used as an oil supply and drainage path leading from each rotary joint to the upper chamber in the cylinder. It is also possible to connect to the discharge side and connect the other opening to the opening of another clamp cylinder so that the oil passing through this clamp cylinder drives the other clamp cylinder.

<Effect of the invention> When using multiple swing-type clamp devices to fix a mold to a base, the swing shafts of these clamp devices can be connected and the swing drive can be performed using a single drive device. This makes it possible to omit the swinging drive device for the remaining clamping equipment, which is economical, and also because the stroke for swinging the clamp rod in the stroke of the clamp cylinder is separated into a separate drive The length of the cylinder can be made shorter than conventional clamping devices, so when using this clamping device, for example, when the dimension from the top surface of the base to the floor on which the mold is mounted is small, the spacing can be reduced compared to conventional clamping devices. This is advantageous because it can be installed in a narrow space. Furthermore, since the swing drive device is separate, the swing angle of the clamp rod can be set to an appropriate angle that does not cause any interference when moving the mold.

[Brief explanation of the drawing]

Fig. 1 is a side view of a clamping device of a swing type clamp device showing one embodiment of this invention, and Fig.
3 is a plan view of the clamp device shown in FIG. 1, FIG. 4 is a partially omitted front view of the swing type clamp device of the same embodiment, and FIG. Figure 4 is a side view of the swing type clamp device, and Figure 6 is a side view of a conventional swing type clamp device.
It is a partial vertical side view which shows an example. 20...Main body, 21...Clamp cylinder, 2
2... Clamp rod, 23... Base, 27...
Engaging portion, 28... cylinder, 29... piston,
30, 31... Swing shaft, 33... Connection shaft, 35...
... Swing drive device, 48 ... Mold, 50 ... Clamped part.

Claims (1)

[Scope of utility model registration request] A clamp cylinder with a clamp rod extending from the piston in the cylinder and having an engagement part for the clamped part at the tip, and a shaft extending perpendicular to the axis of the cylinder on both sides of the cylinder's outer surface and extending through the shaft. A plurality of clamp devices each consisting of a main body that swingably supports the above-mentioned clamp cylinder,
The above shafts are connected so that rotation can be transmitted to each other,
An oscillating clamp device comprising a oscillating drive device connected to the above-mentioned shaft.