JPS62116125A - Mold clamping device - Google Patents

Abstract

PURPOSE:To maintain clamping by the compression spring and offer a clamping device of the mold of simple structure which can provide required pressurizing force by rotating the rotating block to shift the positions of pillar-shaped spacer and the perforation and maintain the spacer on the rotating block while the mold is pressurized by the pressurizing rod. CONSTITUTION:The pressure movable plate 6 and the lower mold 12 are raised up by shifting the pressurizing rod 5, and further contacted and pushed up the upper mold 11, and the movable plate 3 compresses the compression spring 4 to accumulate repulsion power. When the pressurizing rod 5 rises up by fixed distance, the pillar-shaped spacer 9 set on the pressure movable plate 6 is removed from the perforation 10 of the rotating block 8. Next, after shifting each position by rotating the rotating block 8, the pressure from the outer pressurizing unit is released to maintain clamping with repulsion power of the compression spring 4. Thus, only one driving system has to be installed to close the mold in the transfer injection molding unit or vulcanizing unit to dispose more than one mold on the rotating table, offering an easier maintenance, check and repair.

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 plastics, a hydraulic cylinder or a toggle that uses the extension and contraction of an arm is used to keep the upper and lower molds in a clamped state. Since large pressurizing devices such as hydraulic cylinders and toggles are integrated with individual molds, the entire molding apparatus becomes 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. Because hydraulic piping had to be connected to each mold via the pipe, the structure was complicated, leading to frequent accidents such as oil leaks, and making repairs and inspections 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 vulcanization of rubber or molding of plastic within 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 block held between the movable plate and the lid, a fixed block fixed to the other end of the outer frame, and a fixed block that can be moved in the length direction of the outer frame from the outside to the inside of the fixed block. The inserted pressure rod, the 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, and the relative position between the pressure movable plate and the movable plate. A mold having an upper mold and a lower mold disposed in the same manner, and a movable pressure plate that can be moved to the lid side by a pressure rod to hold the movable pressure plate in a state where the mold is clamped. and a fixing member provided on the fixing block.

The fixed member includes a rotating block held by the fixed block so as to rotate the rotation of the pressure 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 holes through which columnar strips can be inserted and removed in accordance with the movement of the pressure movable plate. In this case, with the pressurizing rod pressurizing the mold, the rotary block is rotated to open the columnar strips 4. - By shifting the positional relationship between the 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 clamping state can be maintained by the action of the compression screws. In addition, the fixing member is a threaded cylinder with a thread on the outer periphery provided so that it can rotate around the pressure rod, and the mold clamping state is maintained even when it is fitted with the thread formed on the inner surface of the fixing block. Various aspects of the fixing member can be considered.

〔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 held between the lid 2 and the movable plate 30, and is configured to repel the movable plate 3 and the lid 2 and push the movable plate 3 toward the other end of the outer frame 1. It has become. A fixed block 7 is fixed to the other end of the outer frame 1, and a pressurizing rod 5 is disposed so as to be movable in the length direction of the outer frame 1, passing through the center of the fixed block 7 from the inside to the outside. Pressure inside R5
A pressurizing movable plate 6 is provided at one end. A rotation block 8 that can rotate around the pressure rod 5 is held between the pressure rod 5 and the fixed block 7. A plurality of columnar spacers 9 protrude from the pressure rod 5 side of the pressure movable plate 6, and the rotation block 8
A plurality of perforations 10 are provided at positions corresponding to these columnar spacers 9, and the columnar spacers 7 can be inserted into and removed from the perforations 10 as the pressure rod 5 moves.

Inside the movable plate 3, that is, on the opposite side from the compression plate 4, there is a heater 13 with a built-in heater 14 via a heat insulating material 15.
A heat insulating material 15 and a heater 13 are similarly fixed to the inside of the pressurizing movable plate 6. Further, between these heating devices 13, an upper mold 11 and a lower mold 12 forming a pair of molds are arranged facing each other.

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. The rubber material is press-fitted into a clamped mold from one injection unit, heated and vulcanized under pressure by mold clamping, and the cured rubber product is taken out. Each process 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 vertically with the lid 2 facing upward, it may be installed vertically with the lid 2 facing downward, or it may be installed horizontally. 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 device 13, heater 14, and heat insulating material 15 are unnecessary.

In FIG. 1, a rotating block 8 is held by a fixed block 7 so that the fixed member can rotate around a pressurizing iron 150, and a plurality of columnar spacers 9 protrude from the movable pressurizing plate 6 toward the rotating block 8. However, as shown in FIG. 2, a threaded cylinder 8' having a thread on the outer periphery and rotatable around the pressure rod 5 is formed on the inner surface of the fixed block 7'. Even if it is fitted with a screw that has been
The mold clamping state by the pressurizing rod 5 can be maintained.

As another modification of the fixing member, an example of an insertion block 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 l, and can be rotated laterally around the pin 22 so that it can be inserted onto the fixed block 7 with the pressure rod 5 sandwiched therebetween. ing. In this example, the pressure rod 5
The pressurizing movable plate 6 is raised, and the insertion block 21 is inserted sideways into the gap created 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 from the mold 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. Pressure rod 5
Due to this movement, the pressurizing movable plate 6 and the lower mold 12 rise, contact the upper mold 11, and further push it up. As a result, the movable plate 3 compresses the compression wire 4, and a repulsive force is stored in the compression wire. When the pressurizing rod 5 moves upward by a predetermined distance, the columnar spacer 9 provided on the pressurizing movable plate 6 separates from the perforation 10 of the rotating block 8. 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, and the perforation 10 is
After shifting the position from the columnar spacer 9, 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 knife 4. In this state, the heater 14 heats the heater 13 to vulcanize the rubber. When opening the mold, the pressure rod P5 is moved slightly upward by the external pressure unit, and the rotating block 8 is rotated to align the position of the perforation 10 with the columnar spacer 9. after that,
When the pressurizing rod 5 is lowered, the columnar spacer 9 closes the perforation 1.
0, the lower die 12 descends until it abuts the stone A-18, and the upper die 11 abuts 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 during mold clamping, 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 stock/e-18, as shown in the figure. It can also be supplied to mold disassembly equipment that does not have

The compression ζ springs 4 may be of any type as long as they can apply the above-mentioned repulsive force to the movable plate 3, and for example, disc springs, coil springs, etc. can be used. By setting the deflection of the spring between mold opening and mold clamping to approximately 2 ton, it is possible to obtain a pressing force of approximately 5 tons with the two sets of plate-shaped springs.

〔Effect of the invention〕

According to the present invention, a compression screw is used as the pressure device for clamping the mold, so the mold clamping device is extremely simple and compact compared to conventional hydraulic devices and toggle devices. can be provided. 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 separately, dramatically increasing area productivity. In addition to improving
Since the mechanism is simple, maintenance, inspection, and repair are easy. In addition, we do not use hydraulic equipment except when opening and closing the mold.
Since the mold clamping state can be maintained by the repulsive force of the compression force, the 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. 3(a) is a schematic sectional view,
FIG. 3(b) is a cross-sectional view taken along line X--X in FIG. 3(a). l...outer frame, 2...lid, 3...movable plate, 4...compression rod, 5...pressure rod,
6... Pressure movable plate, 7, 7'... Fixed block, 8... Rotating block, 8'... Threaded tube, 9...
・Column spacer, 10...perforation, 11...upper mold, 1
2... Lower mold, 21... Insertion block. Applicant Tokai Rubber Industries Co., Ltd. Figure 1

Claims (3)

[Claims] (1) Between the outer frame, the lid fixed to one end of the outer frame, the movable plate that is placed inside the outer frame than the lid and can move in the length direction of the outer frame, and the movable plate and the lid a compression spring held between the outer frame, a fixed block fixed to the other end of the outer frame, a pressure rod inserted into the fixed block so as to be movable in the length direction of the outer frame; a pressurizing movable plate provided at one end of the pressurizing rod in the frame so as to be movable as the pressurizing rod moves; and an upper die disposed facing each other between the pressurizing movable plate and the movable plate. a fixing member provided on a fixed block so as to be able to hold the movable pressurizing plate in a state in which the movable pressurizing plate is moved toward the lid body side by a pressurizing rod and the mold is clamped; A mold clamping device for a mold, characterized by comprising: (2) Consisting of a rotating block held by the fixed block so that the fixed member can rotate around the pressure rod, and a plurality of columnar spacers protruding from the pressurizing movable plate toward the rotating block, the rotating block is pressurized. The mold clamping device for a mold according to claim (1), characterized in that it has a plurality of perforations through which the plurality of columnar spacers can be inserted and removed in accordance with the movement of the movable plate. (3) Claims that the fixing member is a threaded cylinder having a thread on the outer periphery provided so as to be rotatable around the pressure rod, and is fitted with a thread formed on the inner surface of the fixing block. A mold clamping device for a mold according to item (1).