CN220681479U

CN220681479U - Three-plate die with high-reliability structure

Info

Publication number: CN220681479U
Application number: CN202322400289.3U
Authority: CN
Inventors: 陈刚; 胡伟; 苏德孝
Original assignee: Dongguan Wohong Hardware And Plastic Co ltd
Current assignee: Dongguan Wohong Hardware And Plastic Co ltd
Priority date: 2023-09-05
Filing date: 2023-09-05
Publication date: 2024-03-29
Anticipated expiration: 2033-09-05

Abstract

The utility model discloses a three-plate die with a high-reliability structure, which comprises a fixed die, a first movable die and a second movable die, wherein one end of the fixed die is fixed on an injection molding machine and is in a static state, one surface of the first movable die is clung to the fixed die, the other surface of the first movable die is contacted with one surface of the second movable die, the other surface of the second movable die is fixedly connected with a pulling plate, the first movable die and the second movable die reciprocate towards the fixed die under the push-pull action of the pulling plate, a movable device is arranged in the first movable die and can reciprocate in the vertical direction in the first movable die after being stressed, one end of a resin shutter is fixedly connected with the movable device, and the other end of the resin shutter extends out of the contact surface of the first movable die and the second movable die and is inserted into the second movable die to increase the friction force between the two movable dies, so that the opening and closing sequence of the three-plate die is ensured, and the die is not damaged.

Description

Three-plate die with high-reliability structure

Technical Field

The utility model relates to the technical field of dies, in particular to a three-plate die with a high-reliability structure.

Background

When manufacturing complex plastic products, such as products with buckling positions (or similar buckling position structures) or strict product requirements, a three-plate mold technical scheme is adopted when the mold is closed or opened according to time sequence. Three-plate molds are generally classified into a stationary mold (i.e., stationary mold plate), a master mold plate (first movable mold plate), and a movable mold plate (second movable mold plate). In general, when the mold is opened, the two movable templates are separated from the fixed mold firstly, then the two movable templates are separated, and finally the product in the mold cavity is taken out. When the mold is closed, the two movable templates are required to be closed firstly, and finally, the two movable templates and the fixed template are closed. Because of this strict mold opening and closing sequence, a control technique is employed to open and close the mold in order to ensure execution of the sequence.

The currently used three-plate mold opening and closing technology generally adopts a mechanical structure or an electric control technology, but the mold opening and closing scheme of the electric control technology is too complex and has high cost. So the prior art adopts the technical proposal of opening and controlling the opening and closing mould by mechanical structure technology. The common technical means is to use a resin shutter (also called a resin plug screw shutter). The shutter is technically characterized in that a conical screw is arranged in a circular ring with internal threads, and the diameter of the circular ring is slightly expanded through the cooperation of the conical screw and the circular ring, so that the friction force between two movable dies is increased. In actual production, one part of the circular ring is inserted into the first movable mould plate and fixed on the mould plate, and the other part of the circular ring is inserted into the second movable mould plate, so that the sequence of opening and closing is realized by utilizing the friction force generated between the circular ring and the two movable mould plates.

In order to ensure that the two movable templates are not separated first when the mold is opened, the circular ring and the two movable templates are tightly matched as much as possible, so that the diameter of the circular ring is inevitably slightly larger than the aperture of the movable templates, one end of the shutter needs to be fixed in one movable mold, and the other end (namely part or all of the circular ring) is arranged in the other movable mold. For example, the prior art discloses: CN218399308U, CN215203248U, CN215849358U and CN218615180U are all such solutions. However, another disadvantage of this close-fitting solution is that during closing, the first movable platen may be pushed toward the stationary platen before the two movable platens are closed, so that the first movable platen and the stationary platen are closed first. The reason for this failure is that the ring is too tight (in order to ensure that the two moving dies do not separate first during demolding), deformation breaks or deformation bends. Under the action of the pushing force, the first movable template and the fixed template are closed first, so that errors of the die assembly sequence are generated, and the plastic products are broken. The die can be directly impacted more seriously, so that the die core is damaged, and serious production accidents are caused. Therefore, it is necessary to periodically stop the injection molding machine, inspect and replace the closer for safety, thereby reducing productivity, but if a worker forgets to periodically inspect, accidents occur with a high probability.

Therefore, a new solution is needed to improve this problem, and to ensure that safety accidents can be avoided as much as possible even in the event of a failure of the closer.

Disclosure of Invention

In order to improve the defects, the utility model provides a three-plate mold with a high-reliability structure, which can still ensure that a first movable mold is not closed with a fixed mold first under the condition that a shutter is in a close fit state or is inclined.

The object of the utility model is achieved by:

the utility model provides a three board moulds of high reliability structure, including the cover half, first movable mould and second movable mould, wherein the cover half is fixed in the one end of injection molding machine and is in the static state, the cover half is hugged closely to one face of first movable mould, another face and one face of second movable mould are contacted, another face and the arm-tie fixed connection of second movable mould, under the push-pull effect of arm-tie, first movable mould and second movable mould produce reciprocating motion to the cover half direction, be equipped with a movable device in first movable mould, can reciprocate in first movable mould vertical direction after the movable device atress, the one end of resin shutter and this movable device fixed connection, the contact surface of first movable mould and second movable mould is stretched out to other one end, and insert in the second movable mould, be used for increasing the frictional force between two movable moulds, guarantee three board moulds's open and shut order, thereby make the mould not receive the damage. For example, when the resin shutter is in close fit with the second movable mold (or is tilted so that the resin shutter and the second movable mold are not perfectly aligned). When the second movable mould approaches to the first movable mould, the second movable mould is contacted with the resin shutter, and under normal conditions, the resin shutter is inserted into the second movable mould, and the two movable moulds are contacted and closed first and then move towards the fixed mould together, so that mould closing is realized. However, if the resistance between the two is too large, the first movable mold is pushed to move toward the fixed mold under the condition that the two movable molds are not closed. Because the movable device is arranged, the movable device is pushed to the fixed die in advance because the resin shutter is fixedly connected with the movable device, and at the moment, the movable device and the resin shutter form a supporting rod structure to protect the first movable die between the second movable die and the fixed die. The two movable molds do not continue to move toward the fixed mold until the resin shutter is inserted into the first movable mold and the second movable mold are closed. Therefore, the correct die assembly sequence is realized, the first movable die is protected, and die assembly errors caused by damage or too close fit of the resin shutter are avoided.

In the above description, as a preferred scheme, the movable device is a columnar structure, a fixed rod is formed, a counter bore is arranged at the lower end of the fixed rod, an internal thread is arranged in the counter bore and is matched with the resin shutter, a through hole is arranged on the first movable die, and the movable device is inserted into the through hole. The fixing rod is matched with the through hole and can move up and down in the through hole. The fixing rod can be in a cylindrical shape, a square shape, a triangular shape and other structures, and can be suitable for the technical scheme.

In the above description, preferably, the fixing rod is cylindrical. In order to facilitate processing, a circular structure is adopted in the technical scheme.

In the above description, as a preferred scheme, the fixed top is a flat top structure, so as to be matched with the fixed die.

In the above description, as a preferred scheme, the fixing rod is provided with a tangential plane at the top end along the vertical direction, so that the upper end portion of the fixing rod forms an L shape, a pressing plate is correspondingly arranged on the contact surface between the top of the first movable die and the fixed die, and the pressing plate is matched with the tangential plane of the fixing rod to limit the fixing rod, so that the fixing rod cannot be completely separated from the first movable die in the forced ejection state. Through the design of this tangent plane, make the dead lever can not follow the top of first movable mould and break away from, guarantee the safety of mould, this tangent plane and clamp plate's complex another effect simultaneously is, guarantees the convenience and the high efficiency of installation resin shutter, need not adopt other structures to cooperate the installation resin shutter, and the cost is lower. Because the fixing lever is of a circular structure, when the resin shutter is connected under the fixing lever by threads, connection cannot be achieved without other constraint structures of the fixing lever, and because the fixing lever also rotates along with the rotation of the resin shutter.

In the above description, preferably, the pressing plate and the first movable mold are fixedly connected by a screw.

In the above description, as a preferable scheme, the top of the fixing rod is provided with an outwards-expanded convex edge, and the top of the corresponding first movable die is provided with a groove, and the convex edge is matched with the groove, so that the fixing rod cannot be separated from the first movable die when being stressed downwards. In order to prevent the fixing rod from being carried out when the two movable molds are separated, the convex edge is arranged to restrict the space and the position of the downward movement of the fixing rod.

In the above description, as a preferable mode, a spring is provided between the fixed mold and the first movable mold for providing an elastic force to assist in preventing the first movable mold from being prematurely contacted with the fixed mold, and the length of the fixing lever and the resin shutter assembled together is greater than the thickness of the first movable mold. The spring is arranged at two points mainly, and when the die is opened, the spring can push the fixed die and the first movable die to be separated preferentially because the thrust of the first movable die is reduced, and meanwhile, the first movable die and the second movable die are still in a closed state. 2. When the mold is closed, the spring provides a certain resistance to prevent the first movable mold from being closed with the fixed mold preferentially, and when the thrust of the second movable mold is larger than the elastic force, the first movable mold can be closed with the fixed mold.

In the above description, preferably, a counter bore is provided in the contact surface between the second movable mold and the first movable mold, for accommodating the other end of the resin shutter.

In the above description, as a preferable mode, the fixed mold, the first movable mold and the second movable mold are connected by the guide post, and the first movable mold and the second movable mold reciprocate along the guide post.

The beneficial effects of the utility model are as follows: by arranging the movable device, the movable device and the resin shutter form a supporting rod structure, and the first movable die is protected between the second movable die and the fixed die. The two movable molds do not continue to move toward the fixed mold until the resin shutter is inserted into the first movable mold and the second movable mold are closed. Therefore, the correct die assembly sequence is realized, the first movable die is protected, and die assembly errors caused by damage or too close fit of the resin shutter are avoided.

Drawings

The utility model will be described in further detail with reference to the drawings and the detailed description.

FIG. 1 is a separated sectional view of the present embodiment;

fig. 2 is a sectional view of a process of clamping a first movable mold and a second movable mold in the present embodiment;

FIG. 3 is a closed cross-sectional view of two movable molds according to the present embodiment;

FIG. 4 is a fully closed cross-sectional view of three templates of this embodiment;

FIG. 5 is a schematic cross-sectional view of a core insert of the present embodiment;

FIG. 6 is a perspective view of a product of a two-plate mold application;

FIG. 7 is a perspective view of a product of a two-plate mold application

FIG. 8 is a perspective view showing the fit of the fixing rod and the pressing plate

FIG. 9 is a perspective view of a first movable mold display spring hidden

FIG. 10 is a perspective view of a second movable mold display limit post hidden

In the figure, 1 is a fixed die, 2 is a sliding block shovel base, 3 is an inner sliding block, 4 is a die core, 5 is a pressing plate, 6 is a fixed rod, 7 is a first movable die, 8 is a resin shutter, 9 is a second movable die, 10 is a pulling plate, 11 is a spring, and 12 is a limit post.

Detailed Description

The present utility model relates to a three-plate mold with a high reliability structure, which is described in further detail with reference to the drawings and the specific embodiments for the sake of easy understanding, but is not limited to the present utility model.

Application scenario for three-plate mold:

conventional plastic products (as shown in fig. 6) are molded by two plates, a fixed mold 1 and a movable mold 7. Namely, after the two templates are opened, the product is attached to the fixed die 1, and after the product is taken down, the molded product can be obtained, and the die structure is simpler.

But such products cannot employ conventional two-plate die structures if present with openings in the side walls of the product (as shown in fig. 7). A three-plate mold is required to add a laterally moving structure to achieve structural shaping of the hole locations. The molding process is that the lateral sliding block is separated before the main molding die is opened, so that the product can be taken off from the die core. This involves a sequence of opening the mold.

In the three-plate mold, the lateral movement structure and principle are shown as in fig. 1, a sliding block shovel base 2 is fixed at the lower end of a fixed mold 1, and the sliding block shovel base 2 and an inner sliding block 3 are movably connected in an inclined dovetail groove mode. The inner slide 3 is inserted into the first movable die 7 and can move left and right.

When the first movable die 7 approaches the fixed die 1, the inclined dovetail grooves are brought into contact, and then pressure is generated, so that the inner slide 3 is moved in the right direction as viewed in fig. 1, and the state of fig. 4 is brought into. If the first movable mold 7 is far away from the fixed mold 1. The inner slide 3 is moved in the left direction as viewed in fig. 1. The working mode of the three-plate die realizes the purpose of opening holes in the side wall of the product.

Because the design technology of the lateral sliding block is common, the utility model is not described in detail, and the utility model focuses on the sequence of opening and closing the three-plate die and the related safety structure in the embodiment.

When the mold is opened, the second movable mold 9 is pulled to move downwards under the action of the pulling plate 11, and the resin shutter 8 restrains the first movable mold 7 and the second movable mold 9 together, so that the two movable molds (7 and 9) can move simultaneously and are separated from the fixed mold 1, after the first movable mold 7 moves to the position provided with the limiting column 12, the continuous movement is stopped, the second movable mold 9 continues to move, and at the moment, the first movable mold 7 and the second movable mold 9 start to be separated, and a plastic product can be taken out from the mold core 4. The process achieves the purposes that the movable dies (7, 9) are separated from the fixed die first and then separated.

During die assembly, as shown in fig. 2, under the action of the pull plate 11, the second movable die 9 is pushed to move upwards, the second movable die 9 is closed towards the first movable die 7, when the second movable die 9 is contacted with the resin shutter 8, the resin shutter 8 is inserted into a counter bore of the second movable die 9, and then the second movable die and the resin shutter move towards the fixed die together, so that the aim of opening and closing the two movable dies after opening and closing the two movable dies is fulfilled.

When the resin shutter 8 is in the close-fitting and inclined state, the resin shutter 8 cannot be easily inserted into the counter bore of the second movable mold 9, and at this time, the resin shutter 8 continuously pushes the fixing rod 6 to move upwards under the pushing force of the second movable mold 9, so as to extend out of the upper surface of the first movable mold 7, as shown in fig. 3. Thus, when the second movable die 9 continues to be pushed, the fixed rod 6 can be contacted with the fixed die 1 first, and the accident that the first movable die 7 is contacted with the fixed die 1 first is avoided. When the pushing force is large enough, the resin shutter 8 is forced into the counter bore of the second movable mold 9 to close the two movable molds (7, 9), and under the condition of continuing pushing, the fixed rod 6 is relatively extruded by the fixed mold 1 until the first movable mold 7 and the fixed mold 1 are completely closed. As shown in fig. 4.

The above description describes the use of the fixed bar 6 during the entire closing process, which ensures that the first movable mold 7 will close with the second movable mold 9 before contacting the fixed mold 1, thereby avoiding the occurrence of accidents.

The fixing rod 6 is of a columnar structure, a screw hole is arranged at the lower end of the fixing rod, and the fixing rod is in threaded connection with one end of the resin shutter 8. The top end of the fixed rod 6 is provided with a convex edge with a cap-shaped structure, and the corresponding upper surface of the first movable mould 9 is provided with a groove corresponding to the convex edge, so that the fixed rod 6 is prevented from being pulled out of the first movable mould 7 by the second movable mould 9 when the moulds are opened.

Referring to fig. 8, a tangential plane is formed by extending downwards from the upper end of the fixing rod 6 to form an L-shaped structure, a pressing plate 5 is arranged on the first movable die 7, and the edge of the pressing plate 5 corresponds to the tangential plane of the fixing rod 6, and the pressing plate 5 and the tangential plane are attached to each other. When the fixed rod 6 rises to the bottom of the L shape, the fixed rod is limited by the pressure plate 5, and cannot rise continuously, so that the fixed rod 6 is prevented from being separated from the upper part of the first movable die, and in addition, the structure design is convenient for the resin shutter 8 to be in threaded connection with the fixed rod 6, so that the resin shutter 8 is easy to replace.

Referring to fig. 9, in order to further reduce the risk of premature contact between the fixed mold 1 and the first movable mold 7, a spring 11 is interposed therebetween for providing a repulsive force, and if the first movable mold 7 approaches the fixed mold 1 under a small force, the first movable mold 7 and the fixed mold 1 are suspended under the elastic force of the spring 11, and the first movable mold 7 and the fixed mold 1 are closed unless the spring is strongly pressed under a normal pushing force. The spring 11 is mainly arranged at two points, namely, when the die is opened, because the thrust of the first movable die 7 is reduced, the spring 11 can push the fixed die 1 and the first movable die 7 to be separated preferentially, and meanwhile, the first movable die 7 and the second movable die 9 are still in a closed state. 2. When the mold is closed, the spring 11 provides a certain resistance to prevent the first movable mold 7 from being closed with the fixed mold 1 preferentially, and the first movable mold 7 can be closed with the fixed mold 1 only when the thrust of the second movable mold 9 is larger than the elastic force.

The foregoing is a further detailed description of the utility model in connection with specific preferred embodiments, and is not intended to limit the practice of the utility model to such description. It will be apparent to those skilled in the art that several simple deductions or substitutions can be made without departing from the spirit of the utility model, and the scope of the utility model is to be considered as the scope of the utility model.

Claims

1. The utility model provides a three board moulds of high reliability structure, including cover half (1), first movable mould (7) and second movable mould (9), wherein one end that cover half (1) was fixed in the injection molding machine is in static state, and cover half (1) is hugged closely to one face of first movable mould (7), and another face contacts with one face of second movable mould (9), and another face and arm-tie (10) fixed connection of second movable mould (9), under the push-and-pull effect of arm-tie (10), first movable mould (7) and second movable mould (9) produce reciprocating motion to cover half (1) direction, its characterized in that: a movable device is arranged in the first movable die (7), the movable device can reciprocate in the first movable die (7) in the vertical direction after being stressed, one end of the resin shutter (8) is fixedly connected with the movable device, the other end of the resin shutter stretches out of the contact surface of the first movable die (7) and the second movable die (9) and is inserted into the second movable die (9) to increase the friction force between the two movable dies (7, 9) and ensure the opening and closing sequence of the three-plate dies, so that the die is not damaged.

2. The three-plate mold of high reliability structure of claim 1, wherein: the movable device is of a columnar structure, a fixed rod (6) is formed, a counter bore is formed in the lower end of the fixed rod (6), internal threads are formed in the counter bore and matched with the resin shutter (8), a through hole is formed in the first movable die (7), and the movable device is inserted into the through hole.

3. The three-plate mold of high reliability structure according to claim 2, wherein: the fixing rod (6) is cylindrical.

4. The three-plate mold of high reliability structure according to claim 2, wherein: the top of the fixed rod (6) is of a flat-top structure and is matched with the fixed die (1).

5. The three-plate mold of high reliability structure according to claim 2, wherein: the fixing rod (6) is provided with a tangential plane along the vertical direction at the top end, so that the upper end part of the fixing rod (6) forms an L shape, a pressing plate (5) is correspondingly arranged on the contact surface of the top of the first movable die (7) and the fixed die (1), the pressing plate (5) is matched with the tangential plane of the fixing rod (6), the fixing rod (6) is limited, and the fixing rod (6) is in a stressed ejection state and cannot be completely separated from the first movable die (7).

6. The three-plate mold of high reliability structure according to claim 5, wherein: the pressing plate (5) is fixedly connected with the first movable die (7) through screws.

7. The three-plate mold of high reliability structure according to claim 2, wherein: the top of the fixed rod (6) is provided with an outwards-expanded convex edge, a groove is correspondingly arranged at the top of the first movable mould (7), and the convex edge is matched with the groove, so that the fixed rod (6) cannot be separated from the first movable mould (7) when being stressed downwards.

8. The three-plate mold of high reliability structure according to claim 2, wherein: a spring (11) is arranged between the fixed die (1) and the first movable die (7) and is used for providing elastic force to assist in preventing the first movable die (7) from being in contact with the fixed die (1) too early, and the length of the fixed rod (6) and the resin shutter (8) assembled together is larger than the thickness of the first movable die (7).

9. The three-plate mold of high reliability structure according to claim 2, wherein: and a counter bore is arranged on the contact surface of the second movable mould (9) and the first movable mould (7) and is used for accommodating the other end of the resin shutter (8).

10. The three-plate mold of high reliability structure of claim 1, wherein: the fixed die (1), the first movable die (7) and the second movable die (9) are connected through a guide post, and the first movable die (7) and the second movable die (9) reciprocate along the guide post.