Injection mold of waste gas valve cover

Abstract

An injection mold of a waste gas valve deck comprises an upper fixing plate, a female mold plate provided with a female mold core, a male mold plate provided with a male mold core, a supporting plate, a push plate provided with an ejector pin and a lower fixing plate, the male mold core is provided with an outer forming core, and the supporting plate is provided with an inner forming core which is arranged in the outer forming core and provided with a forming gap. A plurality of ejector rods which are distributed in an array and extend into the male mold plate are arranged on the push plate, locking nodes are arranged on the peripheral surfaces of part of the ejector rods arranged in the male mold plate, mounting cavities which are matched with the ejector rods in position and number and enable the locking nodes to be arranged in the mounting cavities are formed in the male mold plate, and locking units combined with the locking nodes are arranged in the mounting cavities. The male mold plate and the female mold plate can move towards the mold opening direction together under the driving force of the push plate during first demolding through the combination of the locking node and the locking unit; and when the male mold plate moves to the limit height, the locking node and the locking unit are separated under the driving force of the push plate, and meanwhile, the product is separated from the outer forming core to realize secondary demolding.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding production of a waste gas valve cover, in particular to an injection molding mold for a waste gas valve cover. Background Art

[0002] The existing mold for the exhaust valve cover has a hook-like protrusion structure on the top of the exhaust valve cover, which makes the mold more troublesome and complicated to operate during demolding, thereby affecting work efficiency. If too much force is used during demolding, the product will be damaged and the qualified rate will be reduced. Utility Model Content

[0003] The utility model aims to solve the above-mentioned shortcomings of the prior art and provides an injection mold of an exhaust valve cover to solve the above-mentioned problems.

[0004] The utility model adopts a technical solution to solve its technical problems: the injection mold of the exhaust valve cover comprises an upper fixed plate, a female mold plate provided with a female mold core, a male mold plate provided with a male mold core, a support plate, a push plate provided with a push pin, and a lower fixed plate, the male mold core has an external molding core, the support plate has an internal molding core placed in the external molding core and leaving a molding gap, a plurality of ejector rods distributed in an array and extending into the male mold plate are arranged on the push plate, locking nodes are arranged on the outer peripheral surfaces of some of the ejector rods placed in the male mold plate, an installation cavity matching the position and number of the ejector rods and allowing the locking nodes to be placed therein is arranged on the male mold plate, a locking unit with an elastic compression amount and combined with the locking node is arranged in the installation cavity, and the combination of the two allows the male mold plate to move toward the mold opening direction together with the female mold plate under the driving force of the push plate during the first demolding, and when the male mold plate moves to the limit height, the locking node and the locking unit are separated under the driving force of the push plate and the product is separated from the external molding core at the same time to realize secondary demolding.

[0005] To be further improved, the installation cavity includes a wide portion and a narrow portion that are interconnected. The wide portion is used to quickly define the final assembly position of the locking unit on the male template when combined with the locking unit. The male template has a through hole for the push rod to move inside and is partially formed on the narrow portion. The through hole formed on the narrow portion allows the locking node to be placed in the narrow portion so that when the locking unit is combined with the narrow portion, it is also combined with the locking node at the same time.

[0006] Further improvement, the locking node includes a semi-enclosing wall, and a rebound space defined within the semi-enclosing wall and allowing the locking unit to rebound to a preset shape, and the semi-enclosing wall abuts against the locking unit at least in a direction opposite to the locking direction.

[0007] To be further improved, the locking unit includes a positioning piece, a locking piece, and an elastic piece for connecting the two, the positioning piece is combined with the wide part, and the locking piece is also combined with the narrow part and the locking node, the elastic piece has an elastic compression amount in the unlocking direction of the locking piece, and provides support for the locking piece so that the locking piece remains combined with the locking node during the locking stage.

[0008] Further improvement, the elastic member is arranged as a spring.

[0009] Further improvement, the semi-enclosing wall is in an arc-shaped configuration, and the locking piece is in a cylindrical configuration.

[0010] The beneficial effects of the utility model are:

[0011] The utility model adopts a two-time demoulding method, that is, during the first demoulding, the inner molding core is first separated from the molded product, so that a space allowing the protruding structure to swing inward is generated inside the hook-shaped protruding structure at the top of the product, and during the second demoulding, the female mold core and the male mold core are separated, and the ejector pin ejects the product to separate the product from the outer molding core. This method can ensure smooth demoulding of the product and can also ensure that the hook-shaped protruding structure at the top of the product will not be damaged due to demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a schematic diagram of the full cross-section structure of the front side of the utility model;

[0014] Figure 3 It is a structural schematic diagram of the front side of the utility model;

[0015] Figure 4 For this utility model Figure 3 A partial enlarged schematic diagram of part A;

[0016] Figure 5 It is a schematic diagram of the full cross-section structure of the male template of the utility model;

[0017] Figure 6 It is a schematic diagram of the exploded structure of the push rod and the locking unit of the utility model;

[0018] Figure 7 This is a schematic diagram of the structure of the exhaust valve cover of the utility model;

[0019] Figure 8 It is a schematic diagram of the structure below the exhaust valve cover of the utility model. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings:

[0021] Referring to the accompanying drawings: the injection mold of the exhaust valve cover includes an upper fixing plate 1, a female mold plate 2 provided with a female mold core 21, a male mold plate 3 provided with a male mold core 31, a support plate 4, a push plate 5 provided with a push pin 51, and a lower fixing plate 6. The male mold core 31 has an outer molding core 31-a, the support plate 4 has an inner molding core 41 placed in the outer molding core 31-a and leaving a molding gap, and a plurality of push rods 52 distributed in an array and extending into the male mold plate 3 are arranged on the push plate 5. The outer peripheral surface of the part of the push rod 52 placed in the male mold plate 3 is provided with a locking node 7. The male template 3 is provided with an installation cavity 32 which matches the position and number of the ejector pin 52 and allows the locking node 7 to be placed therein. A locking unit 8 having an elastic compression amount and combined with the locking node 7 is provided in the installation cavity 32, and the combination of the two allows the male template 3 to move toward the mold opening direction together with the female template 2 under the driving force of the push plate 5 during the first demolding. When the male template 3 moves to the limit height, the locking node 7 and the locking unit 8 are separated under the driving force of the push plate 5 and at the same time, the product is separated from the outer molding core 31-a to realize the secondary demolding. The principle of the utility model is to adopt a two-time demoulding method, that is, in the first demoulding, the push plate 5 is moved upward, and the male template 3 can move along with the movement of the ejector 52 through the combination of the locking node 7 and the locking unit 8. The upper end of the ejector 52 acts on the lower end of the female template 2, and the female template 2 will also move toward the mold opening direction, so that the inner molding core 41 is first separated from the molded product, so that the hook-shaped protruding structure 91 at the top of the product will have a space inside to allow the protruding structure 91 to swing inwards. Because the moving distance of the male template 3 toward the mold opening direction is limited, it will move to the inner mold core 41 when it moves to the inner mold core 41. When it reaches the extreme position, it cannot move further, but the push plate 5 still keeps moving, and while continuing to move, the locking node 7 and the locking unit 8 are separated by the upper end constraint. After the separation, the movement of the push rod 52 will not drive the movement of the male template 3. It uses its own increased length at the upper end of the male template 3 to drive the female template 2 to move, so that the female mold core 21 and the male mold core 31 are separated, and the ejector pin 51 ejects the product to separate the product from the outer molding core 31-a. This method can not only ensure the smooth demolding of the product, but also ensure that the hook-shaped protrusion structure on the top of the product will not be damaged due to demolding.

[0022] The mounting cavity 32 includes a wide portion 32-a and a narrow portion 32-b that are interconnected. The wide portion 32-a is used to quickly define the final assembly position of the locking unit 8 on the male template 3 when combined with the locking unit 8. The male template 3 has a through hole 33 for the ejector rod 52 to move into and is partially formed on the narrow portion 32-b. The through hole 33 formed on the narrow portion 32-b allows the locking node 7 to be placed in the narrow portion 32-b, so that when the locking unit 8 is combined with the narrow portion 32-b, it is also combined with the locking node 7 at the same time. Such an arrangement allows the mounting cavity 32 to have both a space for defining the locking unit 8 on the male template 3 and a space for the locking unit 8 to be combined with the locking node 7, that is, the narrow portion 32-b and the wide portion 32-a are arranged using the size difference to form a The narrow portion 32-b forms a lateral constraint on the locking unit 8, so as to quickly determine the final assembly position of the locking unit 8 on the male template 3, and the narrow portion 32-b can also be used to set a number of threaded holes for threaded connection with the locking unit 8. The narrow portion 32-b is interconnected with the through hole 33, and allows part of the through hole 33 to be placed inside, so that the locking node 7 can be located in the narrow portion 32-b to achieve combination with the locking unit 8. At the same time, the narrow portion 32-b also has a length. This setting is for the locking unit 8 to be pushed to a position away from the locking node 7 in the narrow portion 32-b by squeezing during the second demolding, that is, when the push rod 52 moves independently and no longer drives the male template 3 to move together, but does not separate from the narrow portion 32-b.

[0023] The locking node 7 includes a semi-enclosing wall 71 and a rebound space 72 defined within the semi-enclosing wall 71 and allowing the locking unit 8 to rebound to a preset shape. The semi-enclosing wall 71 abuts against the locking unit 8 at least in the direction opposite to the locking direction. When the locking unit 8 reaches the rebound space 72, the locking unit 8 is freely released from the constrained state of the push rod 52, that is, it recovers to the preset shape under its rebound performance. The semi-enclosing wall 71 plays a blocking role for the locking unit 8 that recovers the preset shape. It uses its own configuration to have an opening on the push rod 52 that allows the locking unit 8 to enter the rebound space 72, and also abuts against the locking unit 8 at least in the direction opposite to the locking direction, thereby preventing the locking unit 8 from returning along the original path, completing the locking state of the push rod 52 and the male template 3. In an implementation case, the locking node 7 is a slot formed on the push rod 52, and the slot wall of the slot forms the semi-enclosing wall 71. The slot allows the space in which the locking unit 8 is placed to form a rebound space 72.

[0024] The locking unit 8 includes a positioning member 81, a locking member 82, and an elastic member 83 for connecting the two. The positioning member 81 is combined with the wide portion 32-a, and the locking member 82 is simultaneously combined with the narrow portion 32-b and the locking node 7. The elastic member 83 has an elastic compression amount in the unlocking direction of the locking member 82, and provides support for the locking member 82 so that the locking member 82 remains combined with the locking node 7 during the locking stage. Such an arrangement enables the locking unit 8 to have both a portion combined with the wide portion 32-a (i.e., the positioning member 81) and a portion combined with the narrow portion 32-b and the locking node 7 (i.e., the locking member 82), and The positioning member 81 is connected with the threaded hole on the narrow portion 32-b by bolts, so that the locking unit 8 can be stably maintained on the male mold plate 3. At the same time, in order to enable the locking member 82 to lock or unlock itself, an elastic member 83 is arranged between the positioning member 81 and the locking member 82, that is, the elastic member 83 has the characteristic of elastic compression so that the locking member 82 can be compressed and deformed when it is out of the locking node 7, and the ability to reset itself after compression deformation is generated. When the locking node 7 is reset to the narrow portion 32-b, the locking member 82 is restored to the preset shape under the action of the elastic member 83, that is, it enters the locking node 7. In an implementation case, the positioning member 81 is a block, and the locking member 82 is a columnar body.

[0025] The elastic member 83 is configured as a spring, which not only has a simple structure, but also has elastic compression and self-reset capabilities. In this way, when the locking member 82 is separated from the locking node 7 and contacts the outer peripheral surface of the push rod 52, the spring will be compressed and deformed. When the locking member 82 enters the locking node 7, the spring will reset itself and apply a driving force to drive the locking member 82 to enter the locking node 7.

[0026] The semi-enclosing wall 71 is in an arc-shaped configuration, and the locking piece 82 is in a cylindrical configuration. Such an arrangement enables the two to be tangentially matched, so that when the male template 3 cannot continue to move toward the mold opening mode, the locking piece 82 can gradually withdraw from the rebound space 72 of the locking node 7 during the movement of the push rod 52, that is, it will not interfere with the unlocking of the locking piece 82.

[0027] Although the present invention has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. An injection mold for an exhaust valve cover, comprising an upper fixing plate (1), a female mold plate (2) provided with a female mold core (21), a male mold plate (3) provided with a male mold core (31), a support plate (4), a push plate (5) provided with an ejector pin (51), and a lower fixing plate (6), characterized in that: The male mold core (31) has an outer molding core (31-a), the support plate (4) has an inner molding core (41) placed in the outer molding core (31-a) and leaving a molding gap, the push plate (5) is provided with a plurality of ejector pins (52) distributed in an array and extending into the male mold plate (3), a locking node (7) is provided on the outer peripheral surface of a portion of the ejector pins (52) placed in the male mold plate (3), and the male mold plate (3) is provided with an installation cavity that matches the position and quantity of the ejector pins (52) and allows the locking node (7) to be placed inside (32), a locking unit (8) having an elastic compression amount and combined with the locking node (7) is arranged in the installation cavity (32), and the combination of the two allows the male template (3) to move toward the mold opening direction together with the female template (2) under the driving force of the push plate (5) during the first demolding, and when the male template (3) moves to the limit height, the locking node (7) and the locking unit (8) are separated under the driving force of the push plate (5) and the product is separated from the outer molding core (31-a) at the same time to achieve secondary demolding.

2. The injection mold for the exhaust valve cover according to claim 1, characterized in that: The installation cavity (32) includes a wide portion (32-a) and a narrow portion (32-b) which are interconnected. The wide portion (32-a) is used to quickly define the final assembly position of the locking unit (8) on the male template (3) when combined with the locking unit (8). The male template (3) has a through hole (33) for the push rod (52) to move inside and is partially formed on the narrow portion (32-b). The through hole (33) formed on the narrow portion (32-b) allows the locking node (7) to be placed in the narrow portion (32-b) so that when the locking unit (8) is combined with the narrow portion (32-b), it is also combined with the locking node (7) at the same time.

3. The injection mold for the exhaust valve cover according to claim 2, characterized in that: The locking node (7) comprises a semi-enclosing wall (71) and a rebound space (72) defined within the semi-enclosing wall (71) and allowing the locking unit (8) to rebound to a preset shape, and the semi-enclosing wall (71) abuts against the locking unit (8) at least in a direction opposite to the locking direction.

4. The injection mold for the exhaust valve cover according to claim 3, characterized in that: The locking unit (8) comprises a positioning member (81), a locking member (82), and an elastic member (83) for connecting the two, wherein the positioning member (81) is combined with the wide portion (32-a), and the locking member (82) is simultaneously combined with the narrow portion (32-b) and the locking node (7), and the elastic member (83) has an elastic compression amount in the unlocking direction of the locking member (82), and provides support for the locking member (82) so that the locking member (82) remains in a state of being combined with the locking node (7) during the locking stage.

5. The injection mold for the exhaust valve cover according to claim 4, characterized in that: The elastic member (83) is configured as a spring.

6. The injection mold for the exhaust valve cover according to claim 5, characterized in that: The semi-enclosed wall (71) is in an arc-shaped configuration, and the locking member (82) is in a cylindrical configuration.

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