WO2022127298A1 - Nitrogen spring auxiliary ejecting mechanism for automobile thin-wall bumper mold - Google Patents

Abstract

A nitrogen spring auxiliary ejecting mechanism for an automobile thin-wall bumper mold, comprising a moving half (1) and a fixed half (2). A molding cavity (3) is formed between the moving half (1) and the fixed half (2); an ejecting block (28) for ejecting an injection molded member and a driving mechanism (4) for driving the ejecting block (28) to move towards or away from the moving half (1) are arranged on the fixed half (2); a spring auxiliary structure (5) is arranged on the ejecting block (28); the spring auxiliary structure (5) can make ejecting movement with respect to the ejecting block (28); a guide structure (6) is further arranged between the ejecting block (28) and the fixed half (2).

Description

Auxiliary ejection mechanism of nitrogen gas spring for automobile thin-walled bumper mold technical field

The utility model belongs to the technical field of manufacturing molds, and relates to a nitrogen gas spring assisted ejection mechanism for a thin-walled bumper mold of an automobile.

Background technique

Injection mold is a tool for producing plastic products, and it is also a tool for imparting complete structure and precise dimensions to plastic products. Injection molding is a processing method used in mass production of certain parts with complex shapes. The injection molding machine injects high pressure into the mold cavity, and after cooling and solidifying, a molded product is obtained. The injection mold consists of a movable mold and a fixed mold. The movable mold is installed on the moving template of the injection molding machine, and the fixed mold is installed on the fixed mold of the injection molding machine. On the template, the movable mold and the fixed mold are closed to form a gating system and a cavity during injection molding. When the mold is opened, the movable mold and the fixed mold are separated to take out the plastic products.

When the product is finished injection molding, the product needs to be released from the mold, and the demolding operation is required. Therefore, it is necessary to set an ejector block or a core-pulling block to complete the demoulding, especially for large products such as car bumpers. Usually, the molding block is directly used for ejection. Although this operation can remove the injection molded part from the mold, due to the large size of the molding block, a second manual demoulding is required, which reduces the demoulding efficiency.

Utility model content

The purpose of this utility model is to solve the above problems, and provide a nitrogen gas spring-assisted ejection mechanism for automobile thin-walled bumper molds.

In order to achieve the above object, the utility model adopts the following technical solutions:

A nitrogen gas spring-assisted ejection mechanism for an automobile thin-walled bumper mold includes a movable mold and a fixed mold, and a molding cavity is formed between the movable mold and the fixed mold, and is characterized in that the fixed mold is provided with a The ejector block that is ejected from the injection molded part and the driving structure that drives the ejector block to be close to or away from the movable mold, the ejector block is provided with a nitrogen gas spring auxiliary structure, and the nitrogen gas spring auxiliary structure can be ejected relative to the ejector block. A guide structure is also arranged between the ejector block and the fixed die.

In the above-mentioned nitrogen gas spring-assisted ejection mechanism for automobile thin-walled bumper molds, the driving structure includes a moving plate arranged in the fixed mold and capable of moving relative to the fixed mold, and the moving plate is provided with a driving rod , a sliding structure is arranged between the top end of the driving rod and the ejecting block.

In the above-mentioned nitrogen gas spring-assisted ejection mechanism for automobile thin-walled bumper molds, the sliding structure includes a slider arranged on the drive rod and a chute opened on the bottom end surface of the ejector block. It is clamped in the chute and slides along the length of the chute.

In the above-mentioned nitrogen gas spring-assisted ejection mechanism for automotive thin-walled bumper molds, the slider includes a main body and connecting wings arranged on the end surfaces on both sides of the main body, and the upper surfaces of the connecting wings are in contact with the upper surface of the main body. Flush, the section of the slider is convex.

In the above-mentioned nitrogen gas spring auxiliary ejection mechanism for automobile thin-walled bumper mold, the nitrogen gas spring auxiliary structure includes an elastic shell arranged inside the ejection block, and the elastic shell has a hollow inner cavity, which is elastic and elastic. The casing is provided with the same ejector outlet as the inner cavity, the inner cavity is provided with an ejector, and the ejector end of the ejector extends from the ejector outlet to the surface of the ejector block.

In the above-mentioned nitrogen gas spring-assisted ejection mechanism for automotive thin-walled bumper molds, the ejector includes a lower sealing portion and an upper ejecting portion connected to the lower sealing portion, and the side edges of the lower sealing portion are connected to the lower sealing portion. The inner wall of the elastic housing is in sealing contact, and an elastic spring is arranged between the upper side of the lower sealing part and the elastic housing, and an air hole is opened on the bottom end surface of the elastic housing.

In the above-mentioned nitrogen gas spring-assisted ejection mechanism for automotive thin-walled bumper molds, a wear-resistant plate is provided on the upper surface of the ejector block at a position corresponding to the piercing portion of the upper ejector portion, and the wear-resistant plate is provided with a wear-resistant plate. There is an upper perforation for the upper ejection part to pass through.

In the above-mentioned nitrogen gas spring-assisted ejection mechanism for automotive thin-walled bumper molds, an assembly cavity for installing a wear-resistant plate is opened on the upper surface of the ejector block, and the wear-resistant plate is fixed to the assembly cavity by bolts Inside.

In the above-mentioned nitrogen gas spring-assisted ejection mechanism for automobile thin-walled bumper molds, the guide structure includes at least two guide rods, and a plurality of the guide rods are symmetrically distributed on both sides of the drive rod, and each of the guide rods The upper end of the guide rod is connected to the ejector block obliquely.

In the above-mentioned nitrogen gas spring-assisted ejection mechanism for automotive thin-walled bumper molds, each of the guide rods is provided with a guide flow channel for cooling liquid to enter, and the inside of the ejector block is provided with a guide flow channel Connected cooling channels for product cooling and forming.

Compared with the existing technology, the advantages of the present utility model are:

1. The ejector block of the present utility model is provided with a nitrogen gas spring auxiliary structure, and the nitrogen gas spring auxiliary structure can carry out the ejection movement relative to the ejector block, and the ejector block is driven by the driving structure to perform the first ejection to eject the injection molded parts. It is separated from the fixed mold, and then the injection molded parts are separated from the ejector block through the auxiliary structure of the nitrogen gas spring to improve the efficiency of demoulding.

2. A sliding structure is arranged between the top end of the driving rod and the ejecting block of the present invention. During the upward movement of the ejecting block, it is guided by the guide structure and then moves laterally relative to the driving rod for adjustment. The sliding structure is used to maintain Stability of ejection block movement.

3. The guide rod of the present invention is provided with a guide flow channel for the cooling liquid to enter, and the cooling structure is directly arranged in the guide rod to reduce the space occupation of the cooling structure.

Other advantages, objects, and features of the present invention will be manifested in part by the description below, and in part will be understood by those skilled in the art from the study and practice of the present invention.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Figure 2 is a schematic diagram of the connection structure of the ejector block in the present invention.

FIG. 3 is a schematic structural diagram of the auxiliary structure of the nitrogen gas spring in the present invention.

Fig. 4 is the internal structure diagram of the guide rod in the present invention.

In the figure, 1. movable mold; 2. fixed mold; 3. molding cavity; 4. driving structure; 5. nitrogen gas spring auxiliary structure; 6. guiding structure; 7. moving plate; 8. driving rod; 9. sliding structure; 10, slider; 11, chute; 12, body; 13, connecting wing; 14, elastic shell; 15, inner cavity; 16, ejector outlet; 17, ejector part; 18, lower sealing part; 19, upper Ejector; 20, elastic spring; 21, air hole; 22, wear-resistant plate; 23, upper perforation; 24, assembly cavity; 25, guide rod; 26, guide flow channel; 27, cooling flow channel; 28, ejection piece.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 to 3, a nitrogen gas spring-assisted ejection mechanism for an automobile thin-walled bumper mold includes a movable mold 1 and a fixed mold 2, and a molding cavity 3 is formed between the movable mold 1 and the fixed mold 2. The mold 2 is provided with an ejector block 28 for ejecting injection molded parts and a drive structure 4 for driving the ejector block 28 to be close to or away from the movable mold 1. The ejector block 28 is provided with a nitrogen gas spring auxiliary structure 5, and the nitrogen gas spring auxiliary structure 5 The ejecting movement can be performed relative to the ejecting block 28 , and a guiding structure 6 is also provided between the ejecting block 28 and the fixed die 2 .

In this embodiment, after the injection molding of the injection molded part is completed, the ejector block 28 is driven by the driving structure 4 to perform the first ejection to separate the injection molded part from the fixed mold 2 , and then pass through the nitrogen gas spring auxiliary structure 5 The injection molded parts are detached from the ejector block 28 to improve the demolding efficiency.

In this embodiment, the driving structure 4 includes a moving plate 7 that is arranged in the fixed mold 2 and can move relative to the fixed mold 2. The moving plate 7 can be driven by an oil cylinder or an air cylinder to move, and the moving plate 7 is provided with a driving rod 8. When the moving plate 7 moves to the side of the movable die 1, the driving rod 8 is linked accordingly. In order to improve the stability of the operation of the ejector block 28, a sliding structure 9 is provided between the top end of the driving rod 8 and the ejector block 28.

In this embodiment, the sliding structure 9 includes a sliding block 10 disposed on the driving rod 8 and a sliding groove 11 formed on the bottom end surface of the ejecting block 28 . The sliding block 10 is clamped in the sliding groove 11 along the sliding groove 11 The slider 10 slides in the longitudinal direction. Preferably, the slider 10 includes a main body 12 and connecting wings 13 arranged on the end surfaces on both sides of the main body 12. The upper surface of the connecting wings 13 is flush with the upper surface of the main body 12, and the cross section of the slider 10 is convex. The shape makes the slider 10 slide more stably after being snapped into the chute 11 .

In this embodiment, the nitrogen gas spring auxiliary structure 5 includes an elastic housing 14 disposed inside the ejector block 28 , the elastic housing 14 has a hollow inner cavity 15 , and the elastic housing 14 is provided with the same cavity 15 . The ejector outlet 16, the inner cavity 15 is provided with an ejector 17, the ejector end of the ejector 17 extends from the ejector outlet 16 to the surface of the ejector block 28, and the ejector 17 includes a lower sealing part 18 and a connection On the upper ejection portion 19 on the lower sealing portion 18 , the side edge of the lower sealing portion 18 is in sealing contact with the inner wall of the elastic housing 14 , and an elastic spring 20 is arranged between the upper side of the lower sealing portion 18 and the elastic housing 14 . , the bottom end surface of the elastic casing 14 is provided with an air hole 21 .

When the nitrogen gas spring auxiliary structure 5 is not in the working state, the upper end of the ejector 17 is flush with the upper surface of the ejection block 28. When the nitrogen gas spring auxiliary structure 5 needs to be driven to perform the ejection movement, nitrogen gas is charged through the air hole 21. , as the gas compresses the inner cavity 15, the lower sealing part 18 will gradually move upward, pushing the upper ejecting part 19 to pass through the ejecting block 28 to achieve the purpose of pushing, when the upper end of the ejecting part 17 needs to be pushed up During reset, after the charged nitrogen gas is extracted, the ejector 17 is reset by the elastic force of the elastic spring 20 .

In order to reduce the wear of the ejector 17 , a wear-resistant plate 22 is provided on the upper surface of the ejector block 28 at the position corresponding to the penetration portion of the upper ejection portion 19 , and the wear-resistant plate 22 is provided with a wear-resistant plate 22 for the upper ejection portion 19 to pass through. The upper perforation 23. In order to improve the installation performance of the wear plate 22 and facilitate the disassembly and assembly of the wear plate 22, an assembly cavity 24 for installing the wear plate 22 is opened on the upper surface of the ejector block 28, and the wear plate 22 is fixed to the assembly cavity by bolts within 24.

In this embodiment, the guide structure 6 includes at least two guide rods 25 , a plurality of guide rods 25 are symmetrically distributed on both sides of the drive rod 8 , and the upper end of each guide rod 25 is obliquely connected to the ejector block 28 . The guide rod 25 is provided with a guide flow channel 26 for cooling liquid to enter, and the inside of the ejector block 28 is provided with a cooling flow channel 27 communicated with the guide flow channel 26 and used for product cooling and forming.

The obliquely arranged guide rod 25 guides the oblique movement of the ejector block 28 . At the same time, the guide rod 25 is provided with a guide flow channel 26 for the cooling liquid to enter, and the cooling structure is directly arranged on the guide rod 25 inside, reducing the space occupied by the cooling structure.

The working principle of the utility model is as follows: after the movable mold 1 and the fixed mold 2 are closed, they enter into the molding cavity 3 through the injection molding channel. Due to the large molding area of the automobile bumper, after the injection molding is completed, the moving plate 7 moves upward. , push the drive rod 8 to move upward, and the ejector block 28 is driven by the drive structure 4 to perform the first ejection to separate the injection molded part from the fixed mold 2. During this process, the ejector block 28 passes through the guide rod 25. When the auxiliary structure 5 of the nitrogen gas spring needs to be driven to perform the ejection movement, nitrogen gas is charged through the air hole 21. As the gas compresses the inner cavity 15, the lower sealing part 18 will gradually move upward, pushing the upper The ejector portion 19 protrudes from the ejector block 28 to achieve the purpose of ejection. When the upper end of the ejector member 17 needs to be reset, the ejector member 17 passes through the elastic force of the elastic spring 20 after the nitrogen charged is removed. Perform a reset.

The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or replace them in similar ways, but will not deviate from the spirit of the present invention or go beyond the appended claims the defined range.

Although the movable mold 1, the fixed mold 2, the molding cavity 3, the driving structure 4, the gas spring auxiliary structure 5, the guiding structure 6, the moving plate 7, the driving rod 8, the sliding structure 9, the sliding block 10, the chute are used more in this paper 11. Main body 12, connecting wings 13, elastic housing 14, inner cavity 15, ejector outlet 16, ejector 17, lower sealing part 18, upper ejection part 19, elastic spring 20, air hole 21, wear-resistant plate 22, Terms such as upper perforation 23, assembly cavity 24, guide rod 25, guide flow channel 26, cooling flow channel 27, ejector block 28, etc., do not exclude the possibility of using other terms. These terms are only used to describe and explain the essence of the present invention more conveniently, and it is contrary to the spirit of the present invention to interpret them as any kind of additional limitations.

Claims (10)

A nitrogen gas spring-assisted ejection mechanism for an automobile thin-walled bumper mold, comprising a movable mold (1) and a fixed mold (2), and a molding cavity (1) is formed between the movable mold (1) and the fixed mold (2). 3), characterized in that the fixed mold (2) is provided with an ejector block (28) for ejecting injection molded parts and a drive structure (4) for driving the ejector block (28) to approach or away from the movable mold (1). ), the ejector block (28) is provided with a nitrogen gas spring auxiliary structure (5), and the nitrogen gas spring auxiliary structure (5) can perform ejection movement relative to the ejector block (28), and the ejector A guide structure (6) is also arranged between the block (28) and the fixed die (2). The nitrogen gas spring-assisted ejection mechanism for an automobile thin-walled bumper mold according to claim 1, characterized in that the driving structure (4) comprises a fixed mold (2) which is arranged in the fixed mold (2) and can be opposed to the fixed mold (2). A moving plate (7) for movement, a driving rod (8) is provided on the moving plate (7), and a sliding structure (9) is provided between the top end of the driving rod (8) and the ejector block (28). ). The nitrogen gas spring-assisted ejection mechanism for automobile thin-walled bumper molds according to claim 2, wherein the sliding structure (9) comprises a sliding block (10) arranged on the driving rod (8) and a sliding block (10) arranged on the drive rod (8) On the chute (11) on the bottom end surface of the ejector block (28), the sliding block (10) is clamped in the chute (11) and slides along the length direction of the chute (11). The nitrogen gas spring-assisted ejection mechanism for an automobile thin-walled bumper mold according to claim 3, wherein the slider (10) comprises a body (12) and a A connecting wing (13), the upper surface of the connecting wing (13) is flush with the upper surface of the main body (12), and the cross section of the sliding block (10) is convex. The nitrogen gas spring auxiliary ejection mechanism for automobile thin-walled bumper molds according to claim 1, characterized in that, the nitrogen gas spring auxiliary structure (5) comprises an elastic shell ( 14), the elastic housing (14) has a hollow inner cavity (15), the elastic housing (14) is provided with the same ejector outlet (16) as the inner cavity (15), the inner cavity An ejector (17) is provided in (15), and the ejection end of the ejector (17) extends from the ejector outlet (16) to the surface of the ejector block (28). The nitrogen gas spring-assisted ejection mechanism for an automobile thin-walled bumper mold according to claim 5, wherein the ejector (17) comprises a lower sealing portion (18) and is connected to the lower sealing portion (18) The upper ejection part (19) of the upper part, the side edge of the lower sealing part (18) is in sealing contact with the inner wall of the elastic housing (14), and the upper side of the lower sealing part (18) is in contact with the elastic housing (14) An elastic spring (20) is arranged therebetween, and an air hole (21) is opened on the bottom end surface of the elastic housing (14). The nitrogen gas spring-assisted ejection mechanism for an automobile thin-walled bumper mold according to claim 6, wherein the upper surface of the ejection block (28) is provided at a position corresponding to the upper ejection portion (19). The wear plate (22) is provided with an upper perforation (23) through which the upper ejection portion (19) passes. The nitrogen gas spring-assisted ejection mechanism for an automobile thin-walled bumper mold according to claim 7, wherein an assembly cavity for installing a wear-resistant plate (22) is provided on the upper surface of the ejector block (28). (24), the wear-resistant plate (22) is fixed in the assembly cavity (24) by means of bolts. The nitrogen gas spring-assisted ejection mechanism for an automobile thin-walled bumper mold according to claim 2, wherein the guide structure (6) comprises at least two guide rods (25), a plurality of the guide rods ( 25) are symmetrically distributed on both sides of the drive rod (8), and the upper end of each guide rod (25) is connected to the ejector block (28) obliquely. The nitrogen gas spring-assisted ejection mechanism for an automobile thin-walled bumper mold according to claim 9, wherein each of the guide rods (25) is provided with a guide flow channel (26) for the cooling liquid to enter, The inside of the ejector block (28) is provided with a cooling flow channel (27) that communicates with the guide flow channel (26) and is used for cooling and molding of the injection-molded part.

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