JPH0152164B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for pressurizing and clamping a mold used for injection molding of rubber, plastic, or the like.

[Conventional technology]

In injection molding equipment for rubber and plastic, a hydraulic cylinder or a toggle that utilizes the extension and contraction of an arm was used to keep the upper and lower molds in a clamped state. Since large pressure devices such as hydraulic cylinders and toggles are integrated with individual molds, the entire molding apparatus has become large and has a complicated mechanism. In particular, in transfer-type molding and vulcanizing equipment that places multiple molds on a rotary table and rotates them intermittently while sequentially press-fitting rubber materials from an injection device and vulcanizing them, the rotary joint is connected to the rotary joint from a hydraulic source. The structure is complicated and accidents such as oil leaks occur frequently due to the need to run hydraulic piping to each mold through the
Repair inspection was also difficult. In addition, it was necessary to continue operating the hydraulic cylinder and toggle until the rubber vulcanization was completed, consuming a large amount of pressurizing energy.

[Problem that the invention seeks to solve]

The present invention does not use conventional hydraulic cylinders or toggles as a pressurizing device that supplies the pressure necessary for mold clamping during rubber vulcanization or plastic molding in a mold, and is simple. The purpose of the present invention is to provide a mold clamping device for a mold that can achieve the necessary pressurization with a mechanism.

[Means for solving problems]

A mold clamping device for a mold according to the present invention includes an outer frame, a lid fixed to one end of the outer frame, and a movable plate arranged inside the outer frame than the lid and movable in the length direction of the outer frame. , a compression spring held between the movable plate and the lid, a fixed block fixed to the other end of the outer frame, and a compression spring inserted into the fixed block so as to be movable in the length direction of the outer frame. a pressurizing rod, a movable pressurizing plate provided at one end of the pressurizing rod in the outer frame so as to be movable as the pressurizing rod moves, and a movable pressurizing plate disposed oppositely between the movable pressurizing plate and the movable plate. A mold having an upper mold and a lower mold arranged, and a fixed block that can hold the movable pressure plate in a state where the mold is clamped by moving the movable pressure plate toward the lid body using a pressure rod. and a fixing member provided at the.

The fixed member includes a rotating block held by the fixed block so as to be able to rotate around the pressurizing rod, a plurality of columnar spacers protruding from the movable pressurizing plate toward the rotating block, and a pressurizing member provided on the rotating block. It can be composed of a plurality of perforations into which columnar spacers can be inserted and removed in accordance with the movement of the movable plate. In this case, with the mold pressurized by the pressure rod,
By rotating the rotating block and shifting the positional relationship between the columnar spacer and the perforation, the columnar spacer is held on the rotating block, so the pressurizing movable plate does not return to the rotating block side, and the mold is clamped by the action of the compression spring. can be maintained. In addition, it is a threaded cylinder with a thread on the outer periphery provided so that the fixing member can rotate around the pressure rod, and maintains the mold clamping state even when fitted with the screw formed on the inner surface of the fixing block. Various aspects of the fixing member can be considered, such as:

〔Example〕

FIG. 1 shows an embodiment of the apparatus of the present invention, which is equipped with a mold for rubber vulcanization.

A lid body 2 is fixed inside one end of an outer frame 1 consisting of a pair of side plates arranged opposite to each other with an interval, and a movable plate 3 is mounted inside the outer frame 1 inside the lid body 2 and extends along the length of the outer frame 1. It is arranged so that it can be moved in the direction. A compression spring 4 such as a disc spring or a coil spring is sandwiched between the lid 2 and the movable plate 3, and causes repulsion between the movable plate 3 and the lid 2 to push the movable plate 3 toward the other end of the outer frame 1. It's becoming like that. A fixing block 7 is fixed to the other end of the outer frame 1, and a pressure rod 5 is disposed so as to be movable in the length direction of the outer frame 1, passing through the center of the fixing block 7 from the inside to the outside. A pressurizing movable plate 6 is provided at one end of the pressurizing rod 5 inside. A rotary block 8 which can rotate around the pressure rod 5 is held between the pressure rod 5 and the fixed block 7 by the fixed block 7. A plurality of columnar spacers 9 protrude from the pressurizing rod 5 side of the pressurizing movable plate 6, and a plurality of perforations 10 are provided at positions corresponding to these columnar spacers 9 on the rotary block 8. The columnar spacer 7 can be inserted into and removed from the perforation 10 according to the movement of the spacer.

A heating plate 13 with a built-in heater 14 is fixed to the inside of the movable plate 3, that is, the side opposite to the compression spring 4, via a heat insulating material 15, and a heat insulating material 15 and a heat plate are similarly attached to the inside of the movable pressurizing plate 6. The board 13 is fixed. Furthermore, an upper mold 11 and a lower mold 12, which constitute a pair of molds, are arranged facing each other between these hot platens 13.

A plurality of these mold clamping devices are installed on the rotary table 20 or on the annular rail, and are used by being sequentially transferred. Each step of press-fitting the rubber material from one injection unit into a clamped mold, heating and vulcanizing it under pressure due to mold clamping, and taking out the cured rubber product is performed while the rotary table 20 etc. rotates once. implement. In this case, although an example is shown in which the device is installed in a rigid configuration with the lid 2 facing upward, it may be installed in a vertical configuration with the lid 2 facing down, or it may be installed in a horizontal configuration. Furthermore,
After the rubber material is press-fitted into the clamped mold from the injection unit, it is also possible to collect a large number of mold clamping devices and house them in a separate vulcanization chamber for vulcanization. In this case, the illustrated heating plate 13, heater 14, and heat insulating material 15 are unnecessary.

FIG. 1 shows a rotating block 8 held by a fixed block 7 so that the fixed member can rotate around the pressure rod 5, and a plurality of columnar spacers 9 protruding from the movable pressure plate 6 toward the rotating block 8. As shown in FIG. 2,
Even if a threaded cylinder 8' having a thread on the outer periphery, which is provided so as to be able to rotate around the pressure rod 5, is fitted with a thread formed on the inner surface of the fixed block 7',
The mold clamping state by the pressurizing rod 5 can be maintained.

As another modification of the fixing member, a row of insertion blocks is shown in FIG. In FIG. 3, the same parts as in FIGS. 1 and 2 are given the same reference numerals.
The insertion block 21 is supported by a pin 22 on the fixed block 7 or the outer frame 1, and can be rotated laterally around the pin 22 to be inserted onto the fixed block 7 with the pressure rod 5 sandwiched therebetween. There is. In this example, the pressurizing movable plate 6 is raised by the pressurizing rod 5, and the insertion block 21 is inserted from the side into the gap formed between the pressurizing movable plate 6 and the fixed block 7, thereby maintaining the mold clamping state.

Note that the outer frame may be composed of a plurality of pillars.

[Effect]

The operation of the device of the present invention will be explained with reference to FIG.

First, in order to change the mold from the open state to the mold clamping state, the entire mold clamping device is held so that it does not move, and then the pressure rod 5 is pressed against the compression spring by the ram of a separately provided pressure unit such as a hydraulic press. Move in direction 4. As the pressure rod 5 moves, the movable pressure plate 6 and the lower mold 12 rise, and the upper mold 11
and push it up further. As a result, the movable plate 3 compresses the compression spring 4, and a repulsive force is stored in the compression spring. When the pressurizing rod 5 moves upward by a predetermined distance, the columnar spacer 9 provided on the movable pressurizing plate 6 closes the perforation 1 of the rotating block 8.
Leave from 0. Usually, the rubber material is injected at this point when the mold is clamped under high pressure by an external pressure unit. Next, the rotary block 8 supported within the fixed block 7 is rotated to shift the position of the perforation 10 from the columnar spacer 9, and then the pressure applied by the external pressure unit is released. Since the columnar spacer 9 is supported on the rotating block 8, the mold does not open, and the mold is kept in a closed state by the repulsive force of the compression spring 4. In this state, the heating plate 13 is heated by the heater 14 to vulcanize the rubber. When opening the mold, the pressure rod 5 is moved slightly upward by the external pressure unit, and the rotary block 8 is rotated to align the perforations 10 with the columnar spacers 9. Thereafter, when the pressure rod 5 is lowered, the columnar spacer 9 is inserted into the perforation 10, the lower mold 12 is lowered until it abuts against the stopper 18, and the upper mold 11 abuts against the hook 16 and stops. In order to facilitate separation of the upper mold 11 and lower mold 12 when the lower mold 12 is lowered, a push rod 17 having a built-in spring may be disposed. If the block 16 is removed when the mold is clamped, the upper and lower molds can be lowered together by lowering the pressure rod 5, and the upper and lower molds can be taken out by sliding them on the stopper 18, and removed from the mold (not shown). It can also be fed to a mold disassembly device.

The compression spring 4 may be of any type as long as it can apply the above-described repulsive force to the movable plate 3, and for example, a disc spring, a coil spring, or the like can be used. The spring deflection between mold opening and mold closing is set to approximately 2 mm, and
It is possible to obtain a pressing force of about 5 tons with a set of disk springs.

〔Effect of the invention〕

According to the present invention, since a compression spring is used as a pressurizing device for clamping a mold, it is possible to provide a mold clamping device that is extremely simple and compact compared to conventional hydraulic devices and toggle devices. can do. Therefore, even in transfer-type injection molding and vulcanization equipment in which multiple molds are placed on a rotary table, etc., only one drive system for closing the molds needs to be installed as a separate unit, dramatically increasing area productivity. In addition to improved performance, the mechanism is simpler, making maintenance, inspection, and repair easier. Moreover, since the mold can be kept in a clamped state by the repulsive force of the compression spring without using a hydraulic device or the like except when opening and closing the mold, consumption of pressurizing energy can be reduced. Moreover, the mold clamping accuracy is also superior to that using toggles, and is sufficiently practical.

[Brief explanation of drawings]

1 and 2 are schematic sectional views showing different embodiments of the device of the present invention, with the left half showing the mold release state and the right half showing the mold clamping state. FIG. 3 is a drawing showing another embodiment of the present invention, and FIG.
The figure is a schematic cross-sectional view, and Figure 3b is a cross-sectional view of Figure 3a.
- a cross-sectional view along the X-rays; 1... Outer frame, 2... Lid, 3... Movable plate, 4... Compression spring, 5... Pressure rod, 6... Pressure movable plate, 7, 7'... Fixed block, 8 ...Rotating block, 8'...Screw tube,
9... Column spacer, 10... Perforation, 11... Upper die, 12... Lower die, 21... Insertion block.

Claims (1)

[Scope of Claims] 1. An outer frame, a lid fixed to one end of the outer frame, a movable plate disposed inside the outer frame than the lid and movable in the length direction of the outer frame, and a movable plate. A compression spring held between the lid bodies, a fixing block fixed to the other end of the outer frame, and a pressurizer inserted from the outside of the fixing block into the fixing block so as to be movable in the length direction of the outer frame. a pressure movable plate provided at one end of the pressure rod in the outer frame so as to be movable as the pressure rod moves; A mold having an upper mold and a lower mold, and a fixed block so as to be able to move the movable pressure plate to the lid side by a pressure rod and hold the movable pressure plate in a state where the mold is clamped. A mold clamping device for a mold, comprising a fixing member. 2. a rotating block held on the fixed block so that the fixed member can rotate around the pressure rod;
It consists of a plurality of columnar spacers protruding from the movable pressurizing plate toward the rotating block, and the rotating block is characterized by having a plurality of perforations through which the plurality of columnar spacers can be inserted and removed in accordance with the movement of the movable pressurizing plate. A mold clamping device for a mold according to claim 1. 3. Claim 1, wherein the fixing member is a threaded cylinder having a thread on the outer periphery and is provided so as to be rotatable around the pressurizing rod, and is fitted with a thread formed on the inner surface of the fixing block. Mold clamping device for the mold described in Section.