CN219667337U

CN219667337U - Injection mold capable of preventing reset interference of sliding block and ejector pin

Info

Publication number: CN219667337U
Application number: CN202320085560.6U
Authority: CN
Inventors: 王尚杰; 陈江伟
Original assignee: Suzhou Zhongyue Baiyi Photoelectric Research And Development Co ltd
Current assignee: Suzhou Zhongyue Baiyi Photoelectric Research And Development Co ltd
Priority date: 2023-01-30
Filing date: 2023-01-30
Publication date: 2023-09-12
Anticipated expiration: 2033-01-30

Abstract

The utility model discloses an injection mold for preventing reset interference of a sliding block and a thimble, which comprises: the ejector pin reset mechanism comprises a firing pin, a limit sleeve and a reset sleeve, wherein the limit sleeve is fixed in the rear die along the die opening and closing direction; the lower end of the reset sleeve is fixed on the ejector plate, and the upper end of the reset sleeve is inserted in the limit sleeve in a sliding way; the upper end of the firing pin is fixed on the front die, and the lower end of the firing pin penetrates through the limit sleeve to be inserted into the reset sleeve in a sliding manner; the reset sleeve is provided with two through holes relatively near the upper end of the reset sleeve, limiting blocks which can move along the radial direction of the reset sleeve are arranged in the two through holes, the inner diameter of the lower end of the limiting sleeve expands outwards, and then an avoidance space for the limiting blocks to move is formed between the limiting sleeve and the reset sleeve. This prevent slider and thimble injection mold that interfere that resets can ensure that the thimble resets completely, and to the prescribing a limit to the thimble board position accurate, the structure is also simpler, occupation space is few.

Description

Injection mold capable of preventing reset interference of sliding block and ejector pin

Technical Field

The utility model relates to the technical field of injection molds, in particular to an injection mold capable of preventing reset interference of a sliding block and a thimble.

Background

For the case that most injection products cannot be demolded normally due to the structure (such as the existence of a back-off), a sliding block is generally adopted, and in the mold opening action of the mold, the sliding block can slide in a direction perpendicular to or at a certain angle with the mold opening and closing direction, so that the normal demolding of the products is realized. For a mold with an ejection mechanism under the slide block, the ejection mechanism must be ensured to completely reset the slide block to close the mold, so that the ejection mechanism cannot interfere with the ejector pin. Based on the existing problems, the prior art has a solution, such as a die with a forced resetting ejection mechanism, which is applied by the applicant in 2021, 05 and 18 days, has application number 202121058240.9, and the authorized notice day is 2021, 12 and 17 days, and drives a front reset rod to move downwards through a front die plate, pushes a rear reset rod to rotate, and makes the rear reset rod forcedly press a thimble plate to drive a thimble to move downwards for resetting. Although the technical scheme can ensure complete reset of the ejector pins, the structure is complex, the limiting position of the ejector pin plate is not accurate enough, and the occupied space is large due to the fact that the ejector pin plate is externally arranged. Therefore, it is necessary to design an injection mold for preventing the sliding block from interfering with the reset of the ejector pin instead of the prior art to realize the complete reset of the ejector pin.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the injection mold for preventing the reset interference of the slide block and the ejector pin, which not only can ensure the complete reset of the ejector pin and avoid the interference with the slide block, but also has accurate and reliable limiting position of the ejector plate, simpler structure and less occupied space, and is arranged in the mold.

The technical scheme adopted by the utility model for solving the technical problems is as follows: an injection mold for preventing reset interference of a slide block and a thimble, comprising: the ejector pin resetting mechanism, the front die fixing plate, the front die, the rear die and the rear die fixing plate are sequentially arranged from top to bottom, a die core is arranged between the front die and the rear die, and a sliding block matched with the die core to participate in injection molding is arranged on the rear die; an ejector plate capable of moving up and down is arranged between the rear die and the rear die fixing plate, a plurality of ejector pins are arranged on the ejector plate, and the ejector pins upwards penetrate through the rear die and extend into the die core and are positioned below the sliding blocks; the ejector pin reset mechanism comprises a firing pin, a limit sleeve and a reset sleeve, and the limit sleeve is fixed in the rear die along the die opening and closing direction; the lower end of the reset sleeve is fixed on the ejector plate, and the upper end of the reset sleeve is inserted in the limit sleeve in a sliding manner; the upper end of the firing pin is fixed on the front die, and the lower end of the firing pin penetrates through the limit sleeve and is inserted into the reset sleeve in a sliding manner; the reset sleeve is provided with two through holes relatively near the upper end of the reset sleeve, limiting blocks capable of moving along the radial direction of the reset sleeve are arranged in the two through holes, the inner diameter of the lower end of the limiting sleeve is expanded outwards, and then an avoidance space for the limiting blocks to move is formed between the limiting sleeve and the reset sleeve.

As a further improvement of the utility model, the limiting block is arc-shaped and is provided with an inner side surface with an arc shape, and when the outer side part of the limiting block is positioned in the avoiding space, the inner side surface and the inner peripheral wall of the reset sleeve are positioned on the same cylindrical surface.

As a further improvement of the utility model, the limiting block is provided with a first conical surface connected between the top surface and the inner side surface of the limiting block, the bottom surrounding edge of the firing pin is provided with a second conical surface, and the firing pin can push the limiting block to slide towards the outer side of the reset sleeve through the cooperation of the second conical surface and the first conical surface.

As a further improvement of the utility model, the limiting block is provided with an outer side surface in a circular arc shape and a third conical surface connected between the outer side surface and the top surface of the limiting block, and a fourth conical surface opposite to the third conical surface is arranged on the inner wall of the limiting sleeve in the avoidance space; when the reset sleeve slides upwards relative to the limit sleeve, the fourth conical surface can push the limit block to slide in the reset sleeve through the third conical surface.

As a further improvement of the utility model, the thimble resetting mechanism is provided with two groups which are respectively positioned at the two oblique angles of the two sides of the thimble plate.

The beneficial effects of the utility model are as follows: the utility model provides an injection mold for preventing the reset interference of a slide block and a thimble, which is characterized in that a limit sleeve is arranged on a rear mold, a reset sleeve is arranged on a thimble plate, and a firing pin is arranged on a front mold; in addition, the thimble resetting mechanism adopted by the utility model is positioned in the die, reasonably utilizes the space in the die, occupies less space and has simple structure.

Drawings

FIG. 1 is a perspective view of an injection mold for preventing the reset interference of a slide block and a thimble;

FIG. 2 is a cross-sectional view of an injection mold for preventing the reset interference of a slide block and a thimble according to the present utility model;

FIG. 3 is an enlarged view of the injection mold FIG. 2A according to the present utility model, wherein the slider is prevented from interfering with the reset of the ejector pin;

FIG. 4 is a perspective view of the ejector pin resetting mechanism of the present utility model with the limiting sleeve removed;

fig. 5 is an exploded view of the reset sleeve and the stopper according to the present utility model.

The following description is made with reference to the accompanying drawings:

1. a front mold fixing plate; 2. a front mold; 3. a rear mold; 4. a rear mold fixing plate; 5. a slide block; 6. a needle ejection plate; 7. a thimble; 8. a striker; 801. a second conical surface; 9. a limit sleeve; 901. a fourth conical surface; 10. resetting the sleeve; 1001. a through hole; 11. a limiting block; 1101. an inner side surface; 1102. a first conical surface; 1103. an outer side surface; 1104. and a third conical surface.

Detailed Description

The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, the present utility model provides an injection mold for preventing the reset interference of a slider and a thimble, comprising: front mould fixed plate 1, front mould 2, back mould 3, back mould fixed plate 4 and thimble canceling release mechanical system that from top to bottom set gradually. The front mould 2 is fixed at the bottom of the front mould fixing plate 1, and the rear mould 3 is fixed at the top of the rear mould fixing plate 4 through square iron. A mold core is arranged between the front mold 2 and the rear mold 3, and a slide block 5 which is matched with the mold core and takes part in injection molding is arranged on the rear mold 3. An ejector plate 6 which can move up and down is arranged between the rear die 3 and the rear die fixing plate 4, a plurality of ejector pins 7 are arranged on the ejector plate 6, and the ejector pins 7 upwards penetrate through the rear die 3 to extend into the die core and are positioned below the sliding blocks 5.

Referring to fig. 2 to 4, the ejector pin resetting mechanism includes a striker 8, a limit sleeve 9, and a resetting sleeve 10. The inside of the limit sleeve 9 is a hollow inner cavity penetrating through the upper end and the lower end of the limit sleeve, the section of the limit sleeve 9 is in an inverted T shape, the limit sleeve is internally arranged in the rear mold 3 along the mold opening and closing direction, and the limit sleeve is fixed at the bottom position through a pressing plate. The reset sleeve 10 is coaxially arranged below the limit sleeve 9, the lower end of the reset sleeve 10 is fixed on the ejector plate 6, and the upper end of the reset sleeve 10 is slidably inserted into the limit sleeve 9. Wherein the outer diameter of the reset sleeve 10 is matched with the inner diameter of the upper part of the limit sleeve 9. The firing pin 8 is coaxially arranged above the limiting sleeve 9, the upper end of the firing pin 8 is fixed on the front die 2, and the lower end of the firing pin 8 passes through the limiting sleeve 9 and is inserted into the reset sleeve 10 in a sliding manner. Wherein the outer diameter of the striker 8 is adapted to the inner diameter of the upper part of the reset sleeve 10.

Further, two through holes 1001 are oppositely arranged near the upper end of the reset sleeve 10, and limiting blocks 11 which can move along the radial direction of the reset sleeve 10 are arranged in the two through holes 1001; the inner diameter of the lower end of the limit sleeve 9 expands outwards, and then an avoidance space for the movement of the limit block 11 is formed between the limit sleeve 9 and the reset sleeve 10.

Specifically, referring to fig. 3 to 5, the limiting block 11 is arc-shaped, and has an inner side 1101 with an arc shape and an outer side 1103 with an arc shape, when the outer part of the limiting block 11 is in the avoidance space, the inner side 1101 and the inner peripheral wall of the reset sleeve 10 are on the same cylindrical surface; when the stopper 11 is retracted into the reset sleeve 10 from the avoiding space, the outer side surface 1103 and the outer circumferential wall of the reset sleeve 10 are on the same cylindrical surface.

Wherein, be provided with the first conical surface 1102 of connecting between its top surface and medial surface 1101 on the stopper 11, the bottom of firing pin 8 is provided with the second conical surface 801 around the edge, and firing pin 8 can be through the cooperation of second conical surface 801 and first conical surface 1102 use in order to promote stopper 11 towards reset sleeve 10 outside slip. The limiting block 11 is further provided with a third conical surface 1104 connected between the outer side surface 1103 and the top surface of the limiting block, and the inner wall of the limiting sleeve 9 in the avoidance space is provided with a fourth conical surface 901 opposite to the third conical surface 1104. When the reset sleeve 10 slides upwards relative to the limit sleeve 9, the fourth conical surface 901 can push the limit block 11 to slide towards the inside of the reset sleeve 10 through the third conical surface 1104.

In this embodiment, the ejector pin resetting mechanism is provided with two groups, which are respectively located at two oblique angles of the ejector pin plate 6, so that the ejector pin plate 6 can be more stably driven to reset in the mold closing process.

The working process of the embodiment is as follows:

fig. 2 shows a mold closing state, when the mold is opened, the front mold 2 is opened relative to the rear mold 3, and the slide block 5 is driven by the inclined top to slide at a certain angle with the mold opening and closing direction so as to separate from the product; at the same time, the front mold 2 drives the striker 8 to move and withdraw from the reset sleeve 10.

After the front die 2 is completely opened, the ejector pin plate 6 drives the ejector pin 7 to move upwards under the drive of the hydraulic cylinder so as to eject the product; meanwhile, the reset sleeve 10 is driven by the thimble plate 6 to synchronously move upwards, in the process, the fourth conical surface 901 and the third conical surface 1104 are matched with each other, so that the limiting block 11 is pushed to slide towards the inside of the reset sleeve 10, the position of the first conical surface 1102 on the limiting block 11 extends into the reset sleeve 10, and the limiting block 11 leaves the avoidance space and moves upwards along with the reset sleeve 10.

When the ejector pin plate 6 is driven by the hydraulic cylinder to perform incomplete reset, and when the front die 2 is clamped relative to the rear die 3, the striker 8 is driven to extend into the reset sleeve 10 and be abutted against the first conical surface 1102 of the limiting block 11, so that the reset sleeve 10 and the ejector pin plate 6 are pushed to move downwards by the limiting block 11 until the limiting block 11 reaches a position opposite to the avoidance space, at the moment, the ejector pin plate 6 and the ejector pin 7 are in a complete reset state, and at the position, the striker 8 is matched with the first conical surface 1102 through the second conical surface 801 to push the limiting block 11 to slide outwards towards the reset sleeve 10 to the avoidance space without stopping the striker 8, and the striker 8 continues to move downwards along with the front die 2 and extend into the reset sleeve 10 until the die clamping state is reached; in the process, the thimble 7 is ensured to be completely reset firstly, and the sliding block 5 is completely reset after being driven by the front die 2, so that mutual interference during reset is avoided.

Therefore, according to the injection mold for preventing the sliding block from being interfered with the thimble reset, through the arrangement of the limit sleeve 9 on the rear mold 3, the arrangement of the reset sleeve 10 on the thimble plate 6 and the arrangement of the firing pin 8 on the front mold 2, the thimble 7 is ensured to be completely reset by pushing the reset sleeve 10 and the thimble plate 6 to move through the limit block 11 by virtue of the firing pin 8 during mold closing, the interference of the thimble 7 and the sliding block 5 in the resetting process is avoided, and the limiting position of the thimble plate 6 is accurate and reliable; in addition, the thimble resetting mechanism adopted by the utility model is positioned in the die, reasonably utilizes the space in the die, occupies less space and has simple structure.

In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The foregoing description is only of a preferred embodiment of the utility model, which can be practiced in many other ways than as described herein, so that the utility model is not limited to the specific implementations disclosed above. While the foregoing disclosure has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes and modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model without departing from the technical solution of the present utility model still falls within the scope of the technical solution of the present utility model.

Claims

1. An injection mold for preventing reset interference of a sliding block and a thimble comprises a front mold fixing plate (1), a front mold (2), a rear mold (3) and a rear mold fixing plate (4) which are sequentially arranged from top to bottom, wherein a mold core is arranged between the front mold (2) and the rear mold (3), and the rear mold (3) is provided with the sliding block (5) matched with the mold core to participate in injection molding; an ejector plate (6) capable of moving up and down is arranged between the rear die (3) and the rear die fixing plate (4), a plurality of ejector pins (7) are arranged on the ejector plate (6), and the ejector pins (7) upwards penetrate through the rear die (3) to extend into the die core and are positioned below the sliding block (5); the method is characterized in that: the ejector pin resetting mechanism comprises a firing pin (8), a limiting sleeve (9) and a resetting sleeve (10), and the limiting sleeve (9) is fixed in the rear die (3) along the die opening and closing direction; the lower end of the reset sleeve (10) is fixed on the thimble plate (6), and the upper end of the reset sleeve is inserted in the limit sleeve (9) in a sliding way; the upper end of the firing pin (8) is fixed on the front die (2), and the lower end of the firing pin passes through the limit sleeve (9) and is inserted into the reset sleeve (10) in a sliding way; the reset sleeve (10) is provided with two through holes (1001) relatively near the upper end of the reset sleeve, two limiting blocks (11) which can move along the radial direction of the reset sleeve (10) are arranged in the through holes (1001), the inner diameter of the lower end of the limiting sleeve (9) expands outwards, and then an avoidance space for the limiting blocks (11) to move is formed between the limiting sleeve (9) and the reset sleeve (10).

2. The injection mold for preventing reset interference of a slider and a thimble according to claim 1, wherein: the limiting block (11) is arc-shaped and is provided with an arc-shaped inner side surface (1101), and when the outer side part of the limiting block (11) is positioned in the avoidance space, the inner side surface (1101) and the inner peripheral wall of the reset sleeve (10) are positioned on the same cylindrical surface.

3. The injection mold for preventing reset interference of a slider and a thimble according to claim 2, wherein: be provided with on stopper (11) and connect its top surface with first conical surface (1102) between medial surface (1101), the bottom of firing pin (8) is provided with second conical surface (801) around the edge, firing pin (8) can pass through second conical surface (801) with first conical surface (1102) cooperation is used to promote stopper (11) towards reset sleeve (10) outside slip.

4. The injection mold for preventing reset interference of a slider and a thimble according to claim 1, wherein: the limiting block (11) is provided with an outer side surface (1103) in a circular arc shape and a third conical surface (1104) connected between the outer side surface (1103) and the top surface of the limiting block, and a fourth conical surface (901) opposite to the third conical surface (1104) is arranged on the inner wall of the limiting sleeve (9) in the avoidance space; when the reset sleeve (10) slides upwards relative to the limit sleeve (9), the fourth conical surface (901) can push the limit block (11) to slide towards the inside of the reset sleeve (10) through the third conical surface (1104).

5. The injection mold for preventing reset interference of a slider and a thimble according to claim 1, wherein: the thimble resetting mechanisms are provided with two groups and are respectively positioned at two oblique angles of the two sides of the thimble plate (6).