Injection mold core pulling device and gas meter non-return support injection mold

Abstract

The utility model discloses an injection mold core-pulling device with a simple and small structure and a gas meter non-return bracket injection mold. According to the technical scheme, the connector comprises a flat base, a square movable insertion core and a cylindrical movable insertion core, insertion grooves are formed in the two sides of the base, mounting column cavities are formed in the bottoms of the insertion grooves, the square movable insertion core is inserted into the insertion grooves, and barb cavities are formed in the bottoms of the square movable insertion core. The cylindrical movable insertion core is inserted into the square movable insertion core, and the lower end of the cylindrical movable insertion core extends into the mounting column cavity.

Description

Technical Field

[0001] The utility model belongs to the field of injection molds, and in particular relates to an injection mold core pulling device and an injection mold for a gas meter backflow prevention bracket. Background Art

[0002] Diaphragm gas meters are usually equipped with a non-return device to prevent the counter gear from reversing. The non-return device includes a non-return bracket and a non-return structure provided on the non-return bracket. Figure 7 As shown in the structure, in order to facilitate the installation of the anti-return bracket, two mounting columns 17 are usually provided on the bracket 16, and a barb 18 is provided on the mounting column 17. Since the barb 18 is composed of three single hooks arranged in a circle, it cannot be directly ejected from the cavity by an ejector after injection molding. Traditionally, a slider core-pulling structure is usually adopted. When demolding, the slider core-pulling is slid to both sides to facilitate the removal of the bracket. The disadvantages of using a slider core-pulling structure are: complex structure, large volume and easy failure, which not only brings inconvenience to production, but also has a high mold opening cost. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an injection mold core pulling device with simple and compact structure and an injection mold for a gas meter backflow prevention bracket.

[0004] To solve the above problems, the technical solution adopted by the utility model includes: a flat base, a square movable core and a cylindrical movable core, the base is provided with slots on both sides, and the bottom of the slots is provided with a mounting column cavity, the square movable core is inserted into the slots, and a barb cavity is provided at the bottom, the cylindrical movable core is inserted into the square movable core, and the lower end extends into the mounting column cavity.

[0005] The injection mold core pulling device is characterized in that: the barb cavity of the square movable insert is provided with a three-point convex rib embedded in the installation column cavity.

[0006] The injection mold core pulling device is characterized in that: the upper end of the square movable core is provided with a mounting portion extending out of the base, a positioning groove is provided in the mounting portion, and the top of the cylindrical movable core is provided with a fixing head fixed in the positioning groove.

[0007] The injection mold core pulling device is characterized in that a guiding inclined surface is provided on the top of the mounting column cavity.

[0008] The injection mold core pulling device is characterized in that pin grooves and positioning arms are provided on both sides of the base.

[0009] The injection mold core pulling device is characterized in that the lower end of the cylindrical movable core is located at the center of the installation column cavity and the extension length is not less than 1 / 2 of the depth of the installation column cavity.

[0010] A gas meter non-return bracket injection mold, comprising an upper mold plate and a lower mold plate, characterized in that the injection mold core pulling device described in any one of the above items is installed on the upper mold plate.

[0011] The advantages of the injection mold core pulling device and the gas meter non-return bracket injection mold of the utility model are as follows: when the upper mold plate is opened, the square movable core and the columnar movable core are first driven away from the base, and then the base is driven away from the lower mold plate, and the elastic characteristics of the barb are utilized to forcibly pull it out from the installation column cavity. The core pulling device with the above structure has the advantages of simple structure and compactness.

[0012] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the core pulling device of the injection mold of the utility model;

[0014] Figure 2 It is a cross-sectional view of the core pulling device of the injection mold of the utility model;

[0015] Figure 3 This is an exploded view of the core pulling device for the injection mold of the utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the square movable insert of the utility model;

[0017] Figure 5 It is a cross-sectional view of the injection mold of the gas meter anti-return bracket of the utility model;

[0018] Figure 6 It is a schematic diagram of injection molding between the core pulling device of the injection mold and the anti-return bracket of the gas meter of the utility model;

[0019] Figure 7 The utility model is a structural schematic diagram of a gas meter anti-return bracket. DETAILED DESCRIPTION Embodiment 1:

[0020] like Figures 1 to 4 As shown, the injection mold core pulling device of the utility model comprises a flat base 1, a square movable plug core 2 and a cylindrical movable plug core 3. Slots 4 are provided on both sides of the base 1, and a mounting column cavity 5 is provided at the bottom of the slot 4. The square movable plug core 2 is inserted into the slot 4. A barb cavity 6 is provided at the bottom of the square movable plug core 2, and the cylindrical movable plug core 3 is inserted into the square movable plug core 2, and the lower end of the cylindrical movable plug core 3 extends into the mounting column cavity 5. During injection molding, liquid plastic is injected upward from the bottom of the mounting column cavity 5.

[0021] Preferably, the barb cavity 6 of the square movable plug 2 is provided with a three-point convex rib 7 embedded in the mounting column cavity 5. The three-point convex rib 7 can better position the square movable plug 2 in the mounting column cavity 5, and the three-point convex rib 7 is used to form three slots on the barb 18, so that the barb 18 has elasticity, so as to be easily withdrawn from the mounting column cavity.

[0022] Preferably, the upper end of the square movable plug core 2 is provided with a mounting portion 8 extending out of the base 1, the mounting portion 8 is provided with a positioning groove 9, and the top of the cylindrical movable plug core 3 is provided with a fixing head 10 fixed in the positioning groove 9. Through the mounting portion 8 structure, it can be more easily fixed in the upper template.

[0023] Preferably, a guiding inclined surface 11 is provided on the top of the installation column cavity 5 so that the barb 18 can be more smoothly withdrawn from the installation column cavity.

[0024] Preferably, pin slots 12 and positioning arms 13 are provided on both sides of the base 1. When the base 1 is installed in the upper template, it is fixed by inserting pins into the pin slots 12, and the positioning arms 13 are positioned and matched with the positioning grooves in the upper template to improve the stability of the connection.

[0025] Preferably, the lower end of the cylindrical movable plug core 3 is located at the center of the installation column cavity 5, and the extension length is not less than 1 / 2 of the depth of the installation column cavity 5, and the ideal extension length is 2 / 3 of the depth of the installation column cavity 5. The injection-molded installation column 17 is made hollow, so that it can be more easily pulled out of the installation column cavity. Embodiment 2:

[0026] like Figures 5 to 7 As shown, the injection mold of the gas meter non-return bracket of the utility model comprises an upper mold plate 14 and a lower mold plate 15, and the upper mold plate 14 is installed with the injection mold core pulling device a described in Example 1. The specific installation method of the injection mold core pulling device a is a well-known technology and will not be described here.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. An injection mold core pulling device, characterized in that: The invention comprises a flat base (1), a square movable plug core (2) and a columnar movable plug core (3); slots (4) are provided on both sides of the base (1); a mounting column cavity (5) is provided at the bottom of the slot (4); the square movable plug core (2) is inserted into the slot (4) and a barb cavity (6) is provided at the bottom; the columnar movable plug core (3) is inserted into the square movable plug core (2) and the lower end thereof extends into the mounting column cavity (5).

2. The injection mold core pulling device according to claim 1, characterized in that: A Mitsubishi convex rib (7) embedded in the mounting column cavity (5) is provided in the barb cavity (6) of the square movable plug core (2).

3. The injection mold core pulling device according to claim 1, characterized in that: The upper end of the square movable plug core (2) is provided with a mounting portion (8) extending out of the base (1), a positioning groove (9) is provided in the mounting portion (8), and the top of the columnar movable plug core (3) is provided with a fixing head (10) fixed in the positioning groove (9).

4. The injection mold core pulling device according to claim 1, characterized in that: The top of the installation column cavity (5) is provided with a guiding inclined surface (11).

5. The injection mold core pulling device according to claim 1, characterized in that: Pin slots (12) and positioning arms (13) are provided on both sides of the base (1).

6. The injection mold core pulling device according to claim 1, characterized in that: The lower end of the columnar movable plug core (3) is located at the center of the installation column cavity (5), and the extension length is not less than 1 / 2 of the depth of the installation column cavity (5).

7. A gas meter anti-return bracket injection mold, comprising an upper mold plate (14) and a lower mold plate (15), characterized in that: The upper mold plate (14) is provided with the injection mold core pulling device (a) according to any one of claims 1 to 6.

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