CN205148818U - Device is expected with fixed attention to automatic cutout runner of many types of chamber of some runner list die joint mould - Google Patents

Abstract

An automatic gate condensate device for a point gate single parting surface multi-cavity mold, the top plate fixing plate is also fixed with an external pull rod, the inside of the external pull rod is hollow and the opening is upward, and the An inner pull rod is installed inside the outer pull rod, the upper end of the inner pull rod is arranged in the middle of multiple molding cavities and is in contact with the coagulation material of the main flow channel, and the lower end of the inner pull rod is installed by a spring to pull the inside In the material rod, the inner pull material rod is limited by the limit device of two gears in the outer pull rod. When the gear position is compressed upward by the ejector rod fixing plate, the inner pull material rod is limited to maintain the compression amount of the spring. The first gear and the second gear are converted by the up and down movement of the outer pull material rod. The structure is simple and reliable, suitable for a multi-cavity plastic mold. The above functions can be realized without increasing the complexity of the mold, just by improving the structure of the mold pull rod, and will not increase the mold manufacturing cost.

Description

A device for automatically cutting off gate condensate for single parting surface multi-cavity mold with point gate

technical field

The utility model relates to a device for automatically cutting off gate condensate of a point gate single parting surface multi-cavity mold.

Background technique

Plastic molds are tools that give plastic products a complete structure and precise dimensions. Different molds are composed of different parts. It mainly realizes the processing of the shape of objects through changes in the physical state of the molded materials. Injection molding is to inject the molten plastic into a cavity with a certain shape through the injection molding machine after the plastic is heated through the barrel, so as to achieve the purpose of molding. It has a short molding cycle and can mold plastic products with complex shapes and dimensional accuracy at one time. Its productivity is high, and it is easy to realize automatic production. With the continuous development of science and technology, and plastic molding products are widely used, the quality requirements of mold molding are getting higher and higher, but the molding efficiency of existing products is low. Together with the runner aggregate, it is ejected by the ejection mechanism, and then the pouring system aggregate and the plastic product are manually cut and separated. Considering the large production batch of the product, this greatly reduces the production efficiency of the product.

However, the existing gate aggregate automatic separation mechanisms mainly exist in the following types: one is to use double parting surfaces to separate the aggregate, but the structure of the double parting surfaces is complex and costly; the other is to manufacture special runner slides. When the mold is opened, the inclined guide column drives the dislocation movement of the runner slider, forcing it to cut off at the gate. This slider device requires high precision. If the slider is not closed tightly when the mold is closed, it will appear Spill phenomenon; another is to use pre-ejection to advance to the gate through the pre-ejection rod, and directly cut off the condensed material at the gate. This requires the injection molding machine to have the function of pre-ejection, but in the mold structure On the other hand, the bottom of all other thimbles except for the runner shearing needle must be reamed, and the complexity of the mold is increased.

Utility model content

Aiming at the deficiencies of the existing technology, the utility model provides a simple and reliable structure, which realizes the automatic separation of the pouring system condensation material and the plastic product, and greatly improves the production efficiency. Cut off the gate aggregate device.

In order to achieve the above purpose, the utility model provides the following technical solutions: a device for automatically cutting off the gate condensate of a multi-cavity mold with a single parting surface at a point gate. A top plate fixing plate is provided, and the top plate fixing plate can move between the movable mold seat plate and the movable mold plate. The top plate fixing plate is fixed with ejector rods corresponding to the positions of the plastic parts in the molding cavity. The top plate An outer pull material rod is also fixed on the fixed plate, the inside of the outer pull material rod is hollow and the opening is upward, and an inner pull material rod is installed inside the outer pull material rod, and the upper end of the inner pull material rod is arranged on a plurality of forming The middle part of the cavity is in contact with the condensate of the main channel. The lower end of the inner pull rod is installed in the inner pull rod through a spring, and the inner pull rod is limited by two gear limit devices in the outer pull rod. The first gear makes the limit of the inner pull rod not disengage in the outer pull rod, and the second gear limits the inner pull rod to maintain the compression amount of the spring when the ejector rod fixing plate compresses the spring upwards. , the first gear and the second gear are converted through the up and down movement of the outer pull rod. The inner pulling rod is a Z-shaped pulling rod.

The limiting device includes a guide groove, a steel ball, a first semicircular groove and a second semicircular groove, and a plurality of the guide grooves are symmetrically arranged on the inner wall of the outer pull rod and extend along the direction of the inner pull rod, A steel ball is installed in each guide groove, and a first semicircle that matches the size of the steel ball and the position of the guide groove is provided on the inner pull rod at the first gear and the second gear. groove and a second semicircular groove.

The distance L between the first semicircular groove and the second semicircular groove is smaller than the maximum compression distance of the spring.

The radius R1 of the first semicircular groove and the second semicircular groove is larger than the radius R2 of the steel ball.

Due to the adoption of the above structure, the device uses springs and steel balls to cooperate with each other to delay the ejection of the inner pull rod, thereby staggering the ejection time of the product and the ejection time of the condensate in the pouring system, so as to achieve the automatic release of the condensate and plastic products in the pouring system. purpose of separation. The arc radius of the first semicircular groove and the second semicircular groove on the inner pulling material rod is equal, and the distance L between the two grooves is smaller than the maximum compression distance of the spring, so that the mechanism can run more smoothly; The radius R1 of the groove on the inner pull rod is greater than the radius R2 of the steel ball, thereby reducing the rigid wear of the mechanism movement; the grooves and steel balls on the inner pull rod should be symmetrically arranged to ensure the stability of the mechanism movement.

To sum up, the structure of this device is simple and reliable, and it is suitable for a multi-cavity plastic mold. The above functions can be realized only by improving the structure of the mold pulling rod without increasing the complexity of the mold. Will increase the cost of mold manufacturing. Standard parts are widely used in molds, which saves R&D and manufacturing costs and shortens the production cycle of products.

Description of drawings

Fig. 1 is the sectional view that the utility model is installed in the mould.

Figure 2 is a top view of the mold.

Fig. 3 is a state diagram of the utility model when it is ready to be ejected.

Fig. 4 is a state diagram of the utility model that the aggregate gate is broken after being ejected for a period of time.

Fig. 5 is a change diagram of the positional relationship between Fig. 3 and Fig. 4 of the present utility model.

Fig. 6 is an enlarged view of Fig. 3C.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1 in this example, the whole pair of molds is composed of a fixed mold and a movable mold. 2. The inner hexagon screws fixed on the base of the fixed mold, etc.) belong to the fixed mold part, and all the parts below the movable template 4 (including the support plate 24, the ejector pin fixing plate 15, the push plate 12 and the movable mold seat plate 9 in sequence, A ejector rod 25 is installed on the ejector rod fixing plate 15, and the ejector rod fixing plate 15 is installed between the push plate 12 and the support plate 24 as a guide reset system through the reset rod 6 and the reset spring 7 set on the reset rod 6 Between) belongs to the dynamic model part.

The molding process of plastic parts in this example can be composed of gating system (including positioning ring 22, gate bushing 23), molding system (including upper concave mold cavity 19, lower concave mold cavity 17, core 18), guide system (including guide Cover 3, guide post 5), ejection system (including push plate 12, ejector rod fixing plate 15, inner pull material rod 16, ejector rod 25, outer pull material rod 26, steel ball 27, spring 28), reset system (including Reset rod 6, return spring 7, reset nail) fastening system (including screws and hexagon socket screws) and support system (including fixed mold seat plate 1, fixed formwork plate 2, movable formwork plate 4, pad iron 8, movable formwork seat plate 9) Wait for several parts to cooperate to realize.

As shown in Figure 2, a device for automatically cutting off the gate condensate of a multi-cavity mold with a single parting surface at a point gate. Molding cavities 29, four molding cavities 29 are distributed symmetrically in a rectangular shape along the formwork, the gating system directly enters from the main channel 30 in the middle of the mold, and directly enters the four molding cavities 29 through the runner 31 and the point gate 32.

It can be seen from Figures 3, 4, and 5 that before forming a plastic part, the mold is tightly closed under the action of the injection machine, and the head of the injection machine is tightly aligned with the center groove of the gate bushing 23, relying on a certain amount of injection pressure, the molten plastic material is injected into the mold cavity formed by the upper concave mold cavity 19, the lower concave mold cavity 17, and the core 18. After the cavity of the mold is filled by injection, the molten plastic is cooled and solidified in the cavity after pressure maintaining and cooling. At this time, the mold is separated from the fixed mold along the parting surface. All the parts on the side of the fixed mold remain in place, while all the parts on the side of the movable mold move downwards. The four plastic parts molded at one time will be tightly wrapped on the mold core due to the shrinkage rate, and the pouring system will condense. The material is also left on the moving mold side due to the Z-shaped drawing head of the inner drawing material rod 16.

When the mold is opened, the two plastic materials retreat together with the movable mold until the screw rod 35 of the injection machine touches the push plate 12, as shown in Figure 6, the push rod 12 drives the ejector pin fixing plate 15, because the ejector pin 25 and the ejector pin The outer pull material rod 26 is all fixed on the push rod fixed plate 15, the motion of the push rod 25 and the outer pull material rod head 26 will be synchronized at first, but the spring 28 between the outer pull material rod 26 and the inner pull material rod 16 is affected. The force will first produce elastic compression. During the upward movement of the ejector rod 25, the outer pull material rod 26 is also moving upward, but the inner pull material rod 16 will be static due to the pressure of the spring 28, and the spring 28 will be compressed to the limit. After the position, the elastic force of the spring 28 forces the steel ball 27 fixed on the outer pull rod 26 to enter the second semicircular groove from the first semicircular groove of the inner pull rod 16, and the steel ball 27 stays in the second semicircular groove. In the circular groove, the outer pulling material rod 26 pushes out the pouring system condensate upwards. To put it simply, the stroke of the inner pull rod 16 is directly behind the ejector rod 25, which directly causes the coagulation material in the pouring system in the middle to be ejected later than the plastic products in the four cavities. Since the mold adopts point gate casting, the ejector The plastic product is automatically cut off at the point gate, so that the automatic separation of the condensate and the product in the gating system is realized. After the plastic part is demolded, the movable mold part of the mold is driven forward by the injection machine, and the reset system forces the ejector system to reset normally, and the mold is closed tightly again, completing a complete molding process and preparing for the next injection.

The length h of the pull rod 26 should meet the following dimensional relationship: h<total length of the ejector rod-thickness of the concave model cavity-thickness of the support plate-the minimum ejection height allowed by the pouring aggregate.

The diameter of the inner pull rod 16 and the thickness of the outer pull rod 26 should be as small as possible on the basis of ensuring that the parts have sufficient rigidity and strength, so as to save mold costs.

Claims (5)

1. An automatic gate condensate device for a multi-cavity mold with a single parting surface at a point gate, a top plate fixing plate is provided on the push plate between the movable mold seat plate and the movable template, and the top plate fixing plate can be Moving between the movable mold seat plate and the movable template, the top plate fixed plate is fixed with ejector pins corresponding to the positions of the plastic parts in the multiple molding cavities, and the feature is that: the top plate fixed plate is also fixed with pull-out pins The outer drawing rod is hollow inside and the opening is upward, the inner drawing rod is installed in the outer drawing rod, the upper end of the inner drawing rod is arranged in the middle of a plurality of molding cavities and is condensed with the main channel Material contact, the lower end of the inner pull rod is installed in the inner pull rod through a spring, and the inner pull rod is limited by two gear limit devices in the outer pull rod, the first gear makes The limit of the inner pull rod is not disengaged in the outer pull rod. The second gear is when the ejector rod fixing plate compresses the spring upwards, and the inner pull rod is limited to maintain the compression of the spring. The first gear and the second gear The two gears are converted through the up and down movement of the pull rod. 2. The automatic gate condensate device for point gate single parting surface multi-cavity mold according to claim 1, characterized in that: said limit device includes a guide groove, a steel ball, a first semicircular concave A groove and a second semicircular groove, a plurality of said guide grooves are arranged symmetrically on the inner wall of the outer pull material rod and extend along the direction of the inner pull material rod, a steel ball is installed in each said guide groove, and said inner pull material A first semicircular groove and a second semicircular groove matching the size of the steel ball and the position of the guide groove are provided on the rod at the first gear position and the second gear position. 3. The automatic gate condensate device for point gate single parting surface multi-cavity mold according to claim 2, characterized in that: the first semicircular groove and the second semicircular groove The distance L is less than the maximum compression distance of the spring. 4. The automatic gate condensate device for point gate single parting surface multi-cavity mold according to claim 3, characterized in that: the first semicircular groove and the second semicircular groove The radius R1 of the steel ball is larger than the radius R2 of the steel ball. 5. The device for automatically cutting off the gate coagulation material of the point-gate single parting surface multi-cavity mold according to claim 1, characterized in that: the inner pulling rod is a Z-shaped pulling rod.