A swing-rod type multiple-parting control mechanism

Abstract

The invention relates to a swing-rod type multiple parting control mechanism. By designing a runner plate on a fixed mold plate, the runner plate size is effectively avoided from increasing, and the thickness and weight of the mold system can be reduced, so as to be adapted to a smaller injection molding machine. The mold opening mechanism enables the mold plates to be opened in sequence as required through the cooperation of an elastic rubber sleeve, a swing rod and a pull rod, so as to ensure that the pouring system or the workpiece is left in a suitable position as required, and at the same time, the spacing between the mold plates after the mold is opened is controlled so that the pouring system and the workpiece have enough space to be taken out smoothly. The entire control mechanism has a compact structure, is easy to use, saves costs, and has strong versatility.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, and in particular to a swing-rod type multiple parting control mechanism. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. At a certain temperature, the completely molten plastic material is stirred by a screw and injected into the mold cavity with high pressure. After cooling and solidification, a molded product is obtained. It has the characteristics of fast production speed, high efficiency, and automated operation. It is suitable for mass production of parts with complex shapes and is one of the important processing methods.

[0003] More complex injection molds often require multi-plate molds and multiple partings so that the pouring system and workpiece can be removed.

[0004] At present, the commonly used multi-plate molds usually have the same outer dimensions as the fixed mold and the movable mold and are arranged between the fixed mold fixed plate and the fixed mold plate. For large molds or multi-cavity molds, such a mold structure has the following problems. First, as the mold size increases, the outer dimensions of the runner plate itself also increase, which will increase the weight of the mold. Second, for large molds or multi-cavity molds, if the runner plate is thin, the rigidity is poor, and the guide length is low (generally the guide length should be 1-1.5 times the diameter of the guide column), which will reduce the stability and reliability of the mold. In order to ensure reliability, the runner plate will be designed to be thicker. The runner plate is located between the fixed mold fixed plate and the fixed mold plate. The increase in its thickness will increase the overall height of the mold, requiring a larger injection molding machine to match it, and the runner will increase, and the weight of the pouring system will increase, which means an increase in cost.

[0005] In addition, the current multi-plate molds generally use resin openers to control the parting order. The resin openers are installed on two adjacent templates. By providing a certain damping force, it is ensured that the two plates do not open too early in the mold opening stroke. During installation, it is necessary to open mounting holes on the two adjacent templates, and open the elastic element (rubber) through a tapered screw. The friction between the elastic element and the template hole is used to control the connection force (damping force) between the templates, thereby controlling the order of template parting. During use, the force provided by the resin opener fluctuates greatly, which is easy to cause action errors and poor reliability. After long-term use, due to aging and wear of the elastic element, failure will occur. When replacing, the mold needs to be removed to solve the problem, which is very inconvenient. Summary of the invention

[0006] In view of the defects of the prior art, the present invention provides a swing-rod type multiple parting control mechanism, which has the advantages of compact structure, easy use and low cost by improving the mold structure and the mold opening mechanism.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A swing-rod type multiple parting control mechanism comprises a mold body and a mold opening mechanism, wherein the mold body is provided with a fixed mold fixing plate, a fixed mold plate and a movable mold plate in sequence from top to bottom, a groove is provided in the middle part below the fixed mold fixing plate, a runner plate is arranged in the groove and its lower end surface is flush with the fixed mold fixing plate, and the mold opening mechanism comprises a pull rod, a swing rod and an elastic rubber sleeve, the pull rod passes through the fixed mold fixing plate, the fixed mold plate and the movable mold plate, a screw at the upper end of the pull rod is arranged in a step hole on the fixed mold fixing plate, a through groove is arranged across the screw, the upper surface of the through groove is an inclined surface, and the lower surface is a plane, a through groove with a larger outer side and a smaller inner side is formed between the inclined surface and the plane, the swing rod passes through the through groove and is arranged in a cavity on the fixed mold fixing plate and the runner plate, the outer end of the swing rod is connected to a pin shaft 2 on the fixed mold fixing plate, the inner end of the swing rod is provided with a long hole and is sleeved on a pin shaft 1 on the runner plate, a blind hole coaxial with the pull rod is provided at the upper end surface of the fixed mold plate, the elastic rubber sleeve is sleeved on the pull rod and is compressed in the blind hole when the mold is closed.

[0009] As a further optimization of the above solution, the elastic rubber sleeve is made of polyurethane rubber.

[0010] As a further optimization of the above solution, a distance ring is provided at the lower end of the pull rod, and the distance ring can be slidably adjusted on the pull rod.

[0011] As a further optimization of the above solution, the distance ring has a hole on the side and is fixed to the pull rod by a set screw.

[0012] As a further optimization of the above solution, one side of the outer circle of the lower end of the pull rod is ground into a flat surface to facilitate the fixation of the distance ring.

[0013] As a further optimization of the above solution, a pouring port is provided on the fixed mold plate, a runner is provided on the runner plate, and the pouring port is connected to the molding cavity on the fixed mold plate through the runner.

[0014] As a further optimization of the above solution, a pulling rod is further provided on the fixed mold fixing plate, and the lower end of the pulling rod is tapered and extends into the flow channel.

[0015] As a further optimization of the above solution, the mold opening mechanisms are symmetrically arranged in 4 groups on the mold body.

[0016] As a further optimization of the above solution, the mold is provided with three parting surfaces, the first parting surface is located between the fixed mold plate and the fixed mold plate, the second parting surface is located between the fixed mold plate and the runner plate, and the third parting surface is located between the fixed mold plate and the movable mold plate.

[0017] As a further optimization of the above solution, the angle between the inclined surface of the through groove and the plane is greater than the swing angle of the swing arm when the mold is opened.

[0018] Beneficial effects:

[0019] 1. The multiple parting control mechanism of the present invention improves the existing multi-plate mold structure and sets the runner plate in the groove of the fixed mold plate, which can effectively reduce the outer dimensions of the runner plate and the overall thickness of the mold. While ensuring the rigidity of the runner plate, it avoids the increase in the outer dimensions of the runner plate and the increase in the weight of the pouring system, effectively reducing the system cost.

[0020] 2. The mold opening mechanism designed in the present invention sets a rocker arm between the fixed mold plate and the runner plate, converts the up and down movement of the pull rod into the rotation of the rocker arm, and further drives the up and down movement of the runner plate. Due to the lever principle, the movement distance of the runner plate is greater than the movement distance of the inclined groove pull rod, which can further reduce the thickness of the fixed mold plate, so that the mold size can be designed to be smaller. Reducing the mold size can match a smaller injection molding machine and produce less casting waste, which means cost savings and meets environmental protection needs. At the same time, this structure has strong applicability and can be applied to multi-cavity molds and single-cavity molds.

[0021] 3. The present invention adopts an elastic rubber sleeve to ensure the parting of the first parting surface. Compared with the resin shutter, it occupies less space, has a simple structure, and is easy to install and replace.

[0022] 4. The lower end of the pull rod of the present invention is designed to be adjustable, and can be flexibly adjusted according to different parting distances, and can be applied to different molds. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of the multiple-partitioning control mechanism of the present invention;

[0024] Figure 2 A structural schematic diagram of the second parting surface of the present invention in the mold opening state.

[0025] Reference numerals:

[0026] 1. Casting system, 2. Runner plate, 3. Pull rod, 4. Pin 1, 5. Screw, 6. Long hole, 7. Rocker, 8. Pin 2, 9. Fixed mold plate, 10. Elastic rubber sleeve, 11. Fixed mold plate, 12. Moving mold plate, 13. Distance ring, 14. Set screw, 15. Pull rod, 16. Injection workpiece, 17. Through groove; Ⅰ. First parting surface, Ⅱ. Second parting surface, Ⅲ. Third parting surface. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, so they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0029] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “middle”, “longitudinal”, “lateral”, “horizontal”, “inside” and “outside” etc. cited in this specification are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0030] like Figure 1 As shown, as a specific embodiment of the present invention, a rocker-type multiple parting control mechanism is used for injection molding, which can control the mold to open in sequence, including a mold body and a mold opening mechanism. The mold body is sequentially provided with a fixed mold plate 9, a fixed mold plate 11 and a movable mold plate 12 from top to bottom. Different from the prior art, the runner plate 2 is arranged on the fixed mold plate 9, that is, a groove is opened in the middle of the lower part of the fixed mold plate 9, and the runner plate 2 is arranged in the groove, and the lower end surface is flush with the fixed mold plate 9. This structure can reduce the size of the runner plate 2 while reducing the thickness and weight of the pouring system 1; wherein, a pouring port is provided on the fixed mold plate 9, and a runner is provided on the runner plate 2. The pouring port is connected to the molding cavity on the fixed mold plate 11 through the runner. A pulling rod 3 is also provided on the fixed mold plate 9, and the lower end of the pulling rod 3 is designed to be conical and extends into the runner.

[0031] The mold body is provided with three parting surfaces, the first parting surface I is located between the fixed mold plate 9 and the fixed mold plate 11, the second parting surface II is located between the fixed mold plate 9 and the runner plate 2, and the third parting surface III is located between the fixed mold plate 11 and the movable mold plate 12.

[0032] The mold opening mechanism mainly controls the mold plates to open in sequence as needed to ensure that the pouring system 1 or the injection molded workpiece 16 stays in the appropriate position as needed, and controls the spacing between the mold plates after mold opening so that the pouring system 1 and the injection molded workpiece 16 have enough space to be taken out smoothly.

[0033] Specifically, the mold opening mechanism includes a tie rod 15, a swing rod 7 and an elastic rubber sleeve 10. The tie rod 15 is arranged to penetrate the fixed mold fixing plate 9, the fixed mold plate 11 and the movable mold plate 12, and a blind hole coaxial with the tie rod 15 is provided on the upper end surface of the fixed mold plate 11. The elastic rubber sleeve 10 is sleeved on the tie rod 15 and arranged in the blind hole. When the mold is closed, the elastic rubber sleeve 10 is compressed in the blind hole. When the mold is opened, its elastic force can separate the mold from the first parting surface I.

[0034] The elastic rubber sleeve 10 is made of polyurethane rubber and has good vibration isolation performance. The operation of the mold is a process of repeated opening and closing. Using polyurethane rubber as an elastic element helps to reduce the vibration of the mold during operation, reduce the impact on the mold guide mechanism, and ensure the accuracy of the mold. At the same time, it has the characteristics of light weight, small installation size, low price, easy installation, and easy replacement. It can be installed and used by putting it on the pull rod 15, saving space. When the elastic force decreases after long-term use, the pull rod 15 can be removed for replacement, which is very convenient.

[0035] The pull rod 15 used in this embodiment is composed of an axially connected screw 5 and a rod body. The screw 5 at the upper end of the pull rod 15 is arranged in a stepped hole on the fixed mold fixing plate 9. A through groove 17 is arranged on the rod portion of the screw 5 and crosses the screw 5. The upper surface of the through groove 17 is an inclined surface, and the lower surface is a plane. A through groove 17 with a larger outside and a smaller inside is formed between the inclined surface and the plane (wherein, inside and outside are relative to the mold, and the outside refers to the side closer to the edge of the mold). The swing rod 7 passes through the through groove 17 and is connected to the pull rod 15. There is a chamber for the swing rod 7 to move, the swing rod 7 passes through the through groove 17 and is located in the chamber, the outer end of the swing rod 7 is hinged on the pin 2 8 on the fixed mold fixing plate 9, the inner end of the swing rod 7 is provided with a long hole 6 and is sleeved on the pin 1 4 on the runner plate 2, so that when the pull rod 15 moves downward, it will drive the swing rod 7 to swing downward. When swinging, the hinge point between the swing rod 7 and the fixed mold fixing plate 9, that is, the pin 2 8, is the rotation axis, and the other end of the swing rod 7 rotates downward, driving the runner plate 2 to move downward, so that the mold is separated from the second parting surface II.

[0036] The above-mentioned rocker type linkage mechanism connects the fixed mold plate 9 and the runner plate 2 through the rocker 7, and drives the rocker 7 to swing through the up and down movement of the pull rod 15, thereby controlling the runner plate 2 to separate from the fixed mold plate 9; due to the lever principle, the movement distance of the runner plate 2 is greater than the movement distance of the pull rod 15. Through such a rocker type mold opening mechanism, the thickness of the fixed mold plate 9 can be further reduced, so that the mold size can be designed to be smaller. At the same time, this structure has strong applicability and can be applied to multi-cavity molds and single-cavity molds.

[0037] To ensure that the swing rod 7 can smoothly pass through the through slot 17 , the opening distance of the small end of the through slot 17 is slightly larger than the width of the swing rod 7 .

[0038] Furthermore, a distance ring 13 is provided at the lower end of the tie rod 15 to control the mold opening distance, and a space for the lower end of the tie rod 15 to move is provided on the fixed mold plate 11 and the movable mold plate 12. In order to improve the versatility of the tie rod 15, the distance ring 13 can slide on the tie rod 15 to adjust the position, and after reaching the appropriate position, it is fixed by the set screw 14, that is, a hole is opened on the side of the distance ring 13, and the set screw 14 is passed through and pressed against the side of the tie rod 15 for fixing. In order to ensure the fixing effect, in this embodiment, one side of the outer circle of the lower end of the tie rod 15 is flattened into a small plane, and the set screw 14 contacts the plane to better ensure the reliability of the connection.

[0039] It should be noted that Figure 1-2 In the figure, distance A refers to the distance between the lower end surface G of the screw 5 at the upper end of the pull rod 15 and the stepped hole surface H on the fixed mold fixing plate 9, distance B refers to the distance between the upper end surface C of the hole on the fixed mold plate 11 and the upper end surface D of the distance ring 13 on the pull rod 15, distance F refers to the height of the pouring system 1, distance M refers to the moving distance of the runner plate 2 when the mold is opened, distance N refers to the height of the conical surface at the lower end of the pulling rod 3, angle β refers to the angle β between the inclined surface and the plane of the through groove 17, and angle α is the angle of rotation of the rocker arm 7 during the mold opening process.

[0040] The working principle of the above-mentioned rocker type multiple parting control mechanism is as follows: when the mold is closed, the elastic rubber sleeve 10 is compressed in the blind hole. When the mold is opened, under the elastic force of the elastic rubber sleeve 10, the mold is first opened from the first parting surface I, and the pouring system 1 is disconnected from the injection molded workpiece 16. Due to the inverted slope of the head of the pull rod 3 (that is, the conical surface, which has a certain pulling force on the pouring system 1), the pouring system 1 remains in the fixed mold, and the fixed mold plate 11 and the movable mold plate 12 continue to move with the injection molding dynamic plate. After moving a distance B, the upper end surface D of the distance ring 13 contacts the hole C surface, driving the pull rod 15 to move downward, and the screw 5 at the upper end of the pull rod 15 drives the rocker 7 to rotate around the pin 2 8. The other end of the rocker 7 is a long hole 6, which is sleeved on the pin 1 4 of the runner plate 2. Due to the rotation of the rocker 7, the pin 1 4 and the runner plate 2 are driven to move downward, so that the runner plate 2 and the fixed mold fixed plate 9 are parted from the second parting surface II. Figure 2 As shown, the pouring system 1 is separated from the drawing rod 3. After moving a distance A, when the screw head G surface contacts the step hole bottom surface H surface, the fixed mold plate 11 stops moving and continues to open the mold. The fixed mold plate 11 and the movable mold plate 12 are separated from the third parting surface III.

[0041] To ensure that the pouring system 1 is removed smoothly, the dimensional matching relationship between the components needs to be considered when designing the mold, such as: the moving distance M of the runner plate 2 is greater than the height N of the conical surface of the pulling rod 3, the spacing dimension B between the C surface and the D surface is greater than the height F of the pouring system 1; the angle β of the through slot on the screw 5 is greater than the rotation angle α of the rocker arm 7, thereby ensuring that the pouring system 1 is removed smoothly.

[0042] According to the above embodiments, the rocker-type multiple parting control mechanism of the present invention, in which the mold designs the runner plate on the fixed mold plate, can reduce the size, weight and cost of the mold system, so as to match a smaller injection molding machine, generate less casting waste, save costs and be beneficial to the environment. At the same time, the mold opening mechanism can make the templates open in sequence as needed, ensure that the casting system or the workpiece remains in the appropriate position as needed, and control the spacing between each template after the mold is opened, so that the casting system and the workpiece have enough space to be taken out smoothly.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A swing-rod type multiple parting control mechanism, comprising a mold body and a mold opening mechanism, wherein the mold body is provided with a fixed mold fixing plate, a fixed mold plate and a movable mold plate in sequence from top to bottom, characterized in that: A groove is opened in the middle part below the fixed mold fixing plate, the runner plate is arranged in the groove and the lower end surface is flush with the fixed mold fixing plate. The mold opening mechanism comprises a pull rod, a swing rod and an elastic rubber sleeve. The pull rod passes through the fixed mold fixing plate, the fixed mold plate and the movable mold plate. The screw at the upper end of the pull rod is arranged in the step hole on the fixed mold fixing plate, and a through groove is arranged across the screw. The upper surface of the through groove is an inclined surface, and the lower surface is a plane. A through groove with a larger outside and a smaller inside is formed between the inclined surface and the plane. The swing rod passes through the through groove and is arranged in the cavity on the fixed mold fixing plate and the runner plate. The outer end of the swing rod is connected to the second pin on the fixed mold fixing plate, and the inner end of the swing rod is provided with a long hole and is sleeved on the first pin on the runner plate. The pull rod moves downward to drive the swing rod to swing downward with the second pin as the rotation axis, so as to drive the runner plate to move downward, so that the runner plate is separated from the fixed mold fixing plate. A blind hole coaxial with the pull rod is provided at the upper end surface of the fixed mold plate, and the elastic rubber sleeve is sleeved on the pull rod and is compressed in the blind hole when the mold is closed.

2. A swing-rod type multiple-parting control mechanism according to claim 1, characterized in that: The elastic rubber sleeve is made of polyurethane rubber.

3. A swing-rod type multiple-parting control mechanism according to claim 1, characterized in that: A distance ring is provided at the lower end of the pull rod, and the distance ring can slide on the pull rod to adjust the position.

4. A swing-rod type multiple-parting control mechanism according to claim 3, characterized in that: The distance ring has a hole on the side and is fixed on the pull rod by a set screw.

5. A swing-rod type multiple-parting control mechanism according to claim 4, characterized in that: One side of the outer circle of the lower end of the pull rod is ground into a flat surface to facilitate the fixing of the distance ring.

6. A swing-rod type multiple-parting control mechanism according to claim 1, characterized in that: The fixed mold fixing plate is provided with a pouring port, the runner plate is provided with a flow channel, and the pouring port is connected to the molding cavity located on the fixed mold plate through the flow channel.

7. A swing-rod type multiple-parting control mechanism according to claim 6, characterized in that: The fixed mold fixing plate is also provided with a pulling rod, the lower end of which is tapered and extends into the flow channel.

8. The swing-rod type multiple-parting control mechanism according to claim 1, characterized in that: The mold opening mechanisms are symmetrically arranged in four groups on the mold body.

9. The swing-rod type multiple-parting control mechanism according to claim 1, characterized in that: The mold is provided with three parting surfaces, the first parting surface is located between the fixed mold plate and the fixed mold plate, the second parting surface is located between the fixed mold plate and the runner plate, and the third parting surface is located between the fixed mold plate and the movable mold plate.

10. The swing-rod type multiple-parting control mechanism according to claim 1, characterized in that: The included angle between the inclined surface of the through groove and the plane is greater than the swing angle of the swing rod when the mold is opened.

Images