JP2006021219A - Clamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clamp device which is made compact by simplifying a mechanism part in addition to does not consume energy at clamping. <P>SOLUTION: This device consists of a clamp mechanism 1 in which a clamp pin 11 is attached at the tip of the piston rod 10 of a fluid pressure cylinder 2, a spring member which is compressed with the piston 13 when the piston rod 10 is advanced by one stroke is provided in the fluid pressure cylinder 2 and a rotary cylinder 3 for rotating the clamp pin 11 to a clamping position and unclamping position which is connected to the piston rod 10 with a spline is provided, a member 4 to be clamped on which an opening 33 for inserting the clamp pin is provided, a clamping stepped part 30 for locking the clamp pin by which the compressed state of the spring member 14 is maintained and a fluid controller 5 for operating the fluid pressure cylinder and the rotary cylinder 3 when the clamp is operated and releasing the fluid pressure of the fluid pressure cylinder and the rotary cylinder at clamping. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention mainly relates to a clamping device capable of attaching a mold to a molding apparatus with one touch.

  As a mold clamping device, the clamp rod is lowered by a hydraulic mechanism, and the mold is clamped by rotating the clamp rod with a fixed female screw that is screwed with a male screw having a large lead angle formed on the clamp rod. Yes (see, for example, Patent Document 1). In addition, a double-acting air cylinder that moves the clamp rod back and forth, a hydraulic cylinder for clamping that clamps the clamp rod, and a twist mechanism that includes a cam groove and cam body that twists the clamp rod by 90 degrees are provided. The clamp rod is rotated 90 degrees by the twist mechanism. After that, there are some which perform clamping by driving a hydraulic cylinder for clamping and lowering a clamp rod (for example, see Patent Document 2).

However, these have the problem that the structure becomes complicated because the linear motion of the cylinder is converted into rotational motion by a screw mechanism or a cam mechanism. In addition, there is a problem that the energy consumption is increased because the operation of the clamp lock is performed by the cylinder, and the clamping force is lost when the hydraulic pressure is lost due to a power failure or the like. Moreover, there is a problem that the mechanism for converting linear motion into rotational motion is complicated and large.
JP-A-1-210131 JP-A-8-33932

  The problem to be solved is that energy is not consumed during clamping and the mechanism is simplified to be compact.

  According to the present invention, a clamp pin is attached to the tip of a piston rod that can be moved forward and backward in the fluid pressure cylinder, and a spring member that is compressed by the piston when the piston rod advances by a stroke is provided in the fluid pressure cylinder. Clamp mechanism with a rotary cylinder that is connected to the rod and spline to rotate the clamp pin to the clamp position or the non-clamp position, and for clamping the clamp pin to maintain the compressed state of the spring member while providing an opening for inserting the crank pin Clamped member formed on the side of the piston rod in the backward direction of the piston rod and the hydraulic cylinder and the rotary cylinder are operated during clamping, and the hydraulic pressure between the hydraulic cylinder and the rotary cylinder is released during clamping. A clamping device comprising a fluid control device. And invention, in the invention of claim 1, in which the clamping device the spring member comprises a plurality of disc springs with the second aspect of the present invention.

  According to the present invention, a clamp pin is attached to the tip of a piston rod that can be moved forward and backward in the fluid pressure cylinder, and a spring member that is compressed by the piston when the piston rod advances by a stroke is provided in the fluid pressure cylinder. Clamp mechanism with a rotary cylinder that is connected to the rod and spline to rotate the clamp pin to the clamp position or the non-clamp position, and for clamping the clamp pin to maintain the compressed state of the spring member while providing an opening for inserting the crank pin Clamped member formed on the side of the piston rod in the backward direction of the piston rod and the hydraulic cylinder and the rotary cylinder are operated during clamping, and the hydraulic pressure between the hydraulic cylinder and the rotary cylinder is released during clamping. By consisting of a fluid control device, Clamping mechanism for advancing and retreating and rotation of the lamp pins can be realized compactly as very simple structure. Further, by using a rotary cylinder to rotate the clamp pin, it is possible to efficiently convert linear motion into rotational motion and to make it compact. In addition, since the clamping force is applied to the clamp pin by the elastic force of the spring member, there is no energy consumption when clamping, and the clamping cost can be maintained even if the fluid pressure is lost due to a power failure, etc. Become.

  Since the spring member is composed of a plurality of disc springs, a strong elastic force can be obtained with a spring having a small stroke, so that the fluid pressure cylinder can be made small. When attaching to the apparatus, it is difficult to be restricted by the installation location.

Next, a preferred embodiment of the present invention used for a mold clamp will be described in detail with reference to FIGS.
In FIG. 1, reference numeral 1 denotes a clamp mechanism, and the clamp mechanism 1 includes a fluid pressure cylinder 2 and a rotary cylinder 3. The fluid pressure cylinder 2 compresses a spring member 14 to be described later by the piston 13 when the piston rod 10 is moved forward and backward and the piston rod 10 is moved forward by a stroke. The rotary cylinder 3 rotates the piston rod 10 of the fluid pressure cylinder 1 forward and backward to rotate the clamp pin 11 to the clamp position or the non-clamp position. For example, four clamp mechanisms 1 are attached mainly to the molding apparatus main body 51 side. Reference numeral 4 denotes, for example, four clamped members attached mainly to the mold 50 side, and 5 denotes a fluid control device that controls fluid pressure such as hydraulic pressure and pneumatic pressure of the fluid pressure cylinder 2 and the rotary cylinder 3.

  A clamp pin 11 is provided at a rotationally symmetric position at the tip of the piston rod 10 of the fluid pressure cylinder 2. A spring member 14 that is compressed by the piston 13 to generate a resilient force is attached to the end of the piston in the cylinder body 12 of the fluid pressure cylinder 2. A clamp force is applied to the clamp pin 11 by the compressed spring member 14. The spring force of the spring member 14 of each fluid pressure cylinder 2 has a spring force sufficient to support the weight of the mold 50.

  Further, the spring member 14 is configured such that an even number of disc springs 14a having a center hole 14b are inserted into the piston rod 10 through the center hole 14b. Further, since the disc spring 14a has a strong resilience even if the spring stroke is small, the fluid pressure cylinder 2 can be made compact, and the degree of freedom of attachment to the molding apparatus main body 51 can be made high. it can.

  Further, the rotary cylinder 3 rotates the crank pin 11 to the crank position or the non-crank position. When the clamp is clamped, the rotary cylinder 3 is rotated about 65 degrees to the right from the neutral position. It is something to move. The rotary cylinder 3 is configured such that a rotary shaft 20 having a spline 20a is engaged with a keyed hollow shaft 10a of a piston rod 10 so as to be slidably engaged with the piston rod 10, and the rotational force of the rotary cylinder 3 is changed to the piston rod. 10 can be transmitted. The length of the rotary shaft 20 of the rotary cylinder 3 is longer than the stroke of the fluid pressure cylinder 2.

  The clamped member 4 is opposed to the piston rod 10, and is provided with a clamp pin locking clamp that is provided with an opening 33 for inserting a crank pin on the surface facing the piston rod 10 and maintains the compressed state of the spring member 14. The step portion 30 is formed on the side surface in the backward direction of the piston rod 10. Thus, the elastic force of the spring member 14 generated by being compressed by the piston 13 acts on the crankpin 11. The clamping step 30 is composed of a cylindrical cam 31. As shown in FIGS. 2 and 3, the cylindrical cam 31 has a clamping step 30 and a clamping step 30 in a cylindrical body 32 having a ceiling. The cam portion 30a is connected to an opening 33 for inserting a clamp pin through an inclined surface 30b.

  The cam portion 30a as the clamping step portion 30 and the opening 33 for inserting the clamp pin are formed at two rotationally symmetric positions of the cylindrical body 32 in accordance with the number of clamp pins disposed at the rotationally symmetric position of the cylinder rod 10. Has been. Further, a stopper portion 34 for stopping the movement of the crank pin 11 is formed on the cam portion 30a as each clamping step portion 30. Since the crank pin 11 rotated by the rotary cylinder 3 can be forcibly stopped by the stopper portion 34, highly accurate rotational position control by the fluid control device 5 is unnecessary.

  The fluid control device 5 controls the fluid pressure of the fluid pressure cylinder 2 and the rotary cylinder 3 as the clamp mechanism 1, and includes a fluid pump 40 for generating a pressure fluid, a pressure fluid return tank 41, and a pressure fluid. And a sequence valve or spring-loaded check valves 43 and 44 for controlling the operation of the fluid pressure cylinder 2 and the rotary cylinder 3, and during the clamping operation, the fluid pressure cylinder 2 and the rotary cylinder 3, and fluid pressure is not applied to the fluid pressure cylinder 2 and the rotary cylinder 3 during clamping by the crank pin 11. Further, by operating the fluid pressure cylinder 2 and the rotary cylinder 3 during the clamping operation, the compression of the spring member 14 is performed by the forward force of the fluid pressure cylinder 2 and the rotational force of the rotary cylinder 3.

  More specifically, when the fluid pressure cylinder 2 moves forward, the rotational force of the rotary cylinder 3 is applied to the piston rod 10, that is, the crankpin 11. The clamp pin 11 inserted into the cylindrical cam 31 through the opening 33 is rotated by the rotational force of the rotary cylinder 3 being transmitted. At this time, since the clamp pin 11 is in a position facing the inclined surface 30b, when the crank pin 11 is rotated, the crank pin 11 moves forward along the inclined surface 30b and assists the compression of the spring member 14. However, after the spring member 14 is compressed only by the fluid pressure cylinder 2 and the clamp pin 11 is moved forward, the rotary cylinder 3 is operated so that the clamp pin 11 is locked to the clamp step 30. Of course it is good.

  In this configuration, when the mold 50 is clamped to the molding apparatus main body 51, the clamp pin is inserted into the clamped member 4 attached to the mold 50 by a robot arm or the like that holds the mold 50. The position of the opening 33 and the position of the crank pin 11 of the clamp mechanism 1 attached to the molding apparatus main body 51 are matched. Thereafter, the mold 50 is advanced to insert the clamp pin 11 into the opening 33 for inserting the clamp pin.

  By this insertion, the clamp pin 11 is disposed at a position facing the inclined surface 30b. In this state, the fluid control device 5 operates the fluid pressure cylinder 2 and the rotary cylinder 3 as the clamp mechanism 1, so that the piston rod 10 moves forward while compressing the spring member 4 by this operation.

  At this time, since the rotary cylinder 3 also operates simultaneously with the operation of the fluid pressure cylinder 2, the crank pin 11 of the piston rod 10 rotates and moves forward along the inclined surface 30b. By this operation, the spring member 14 is compressed by the advancing force of the fluid pressure cylinder 2 and the rotational force of the rotary cylinder 3, so that the spring member 14 is compressed even if the output of the fluid pressure cylinder 2 is smaller than the elastic force of the spring member 14. Can do. This compression is performed until it is stopped by the contact of the clamp pin 11 with the stopper portion 34. When the rotation of the clamp pin 11 is stopped by the stop portion 34, the clamp pin 11 is rotated about 65 degrees and disposed on the clamping step portion 30.

  When the clamp pin 11 advances and rotates in this way and is positioned on the clamping step portion 30, the fluid control device 5 stops the fluid pressure on the fluid pressure cylinder 1 and the rotary cylinder 2. Thus, the mold 50 is supported by the molding apparatus main body 51 only by the elastic force of the spring member 14. Therefore, no energy is consumed in the clamp of the mold 50, so that the running cost can be greatly reduced. When the mold 50 is exchanged, the mold 50 may be detached from the molding apparatus main body 51 by performing the reverse operation.

It is a front view which shows preferable embodiment of this invention. It is a cross-sectional view which expands and shows the to-be-clamped member used for preferable embodiment of this invention. It is a partially cutaway side view which similarly shows a clamped member in an enlarged manner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clamp mechanism 2 Fluid pressure cylinder 3 Rotary cylinder 4 Clamped member 5 Fluid control apparatus
10 Piston rod
11 Clamp pin
13 Piston
14 Spring member
14a Belleville spring
30 Step for clamping
33 opening

Claims (2)

  A clamp pin is attached to the tip of the piston rod that can move forward and backward in the fluid pressure cylinder, and when the piston rod moves forward by the stroke, a spring member that is compressed by the piston is installed in the fluid pressure cylinder, and the piston rod and spline are connected. Clamp mechanism for providing a rotary cylinder for rotating the clamp pin to the clamp position or the non-clamp position, and a clamp stage for clamping the clamp pin for providing a crank pin insertion opening and maintaining the compressed state of the spring member A clamped member formed on the side of the piston rod in the retreat direction, and a fluid control device that operates the fluid pressure cylinder and the rotary cylinder during clamping and releases the fluid pressure between the fluid pressure cylinder and the rotary cylinder during clamping. A clamping device comprising: The clamping device according to claim 1, wherein the spring member includes a plurality of disc springs.

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