Gas meter gear injection mold

Abstract

The utility model discloses a gas meter gear injection mold which is simple in structure, easy to demold and high in production efficiency. According to the technical scheme, the gear mold comprises an upper mold plate, a lower mold plate and a gear mold core assembly arranged between the upper mold plate and the lower mold plate, the gear mold core assembly is composed of a mold cavity bottom plate, a mold cavity cover plate and a movable mold cavity bottom core assembly, the mold cavity bottom plate is installed in a lower groove of the lower mold plate and provided with a gear tooth mold cavity, and the movable mold cavity bottom core assembly is connected with the mold cavity cover plate. The mold cavity cover plate is installed in an upper groove of the upper mold plate and covers the mold cavity bottom plate in a sealing mode, the movable mold cavity bottom core assembly is movably installed at the bottom of a lower groove of the lower mold plate, the bottom of the movable mold cavity bottom core assembly is connected with a first demolding plate, and the two ends of the first demolding plate are connected with the upper mold plate through first mold drawing rods; the movable cavity bottom core assembly is composed of an outer bottom core and an inner bottom core, a gear shaft cavity is formed between the top of the outer bottom core and the top of the inner bottom core, the outer bottom core is composed of a first outer bottom core and a second outer bottom core, and an elastic piece is arranged between the first outer bottom core and the second outer bottom core.

Description

Technical Field

[0001] The present invention relates to a mold, and particularly to an injection mold for a gas meter gear. Background Art

[0002] The structure of the gas meter gear is as Figure 14 shown, and it is composed of a gear body 30 and a gear shaft 31 integrally formed at the bottom of the gear body 30. A hook 32 is provided at the bottom of the gear shaft 31. Due to the hook 32 provided at the bottom of the gear shaft 31, the injection-molded gear cannot be ejected by the conventional ejector pin demolding method. Therefore, for the injection molding of the hook 32 structure, a slider core-pulling structure is adopted. When demolding, the slider core-pulling is slid open to both sides to facilitate the removal of the gear. The disadvantages of adopting the slider core-pulling structure are as follows: 1. The structure is complex, the volume is large, and it is prone to failure, which brings inconvenience to production; 2. Due to the large volume and much occupied space, the traditional mold can usually only achieve a 1-out-2 production method, and the production efficiency is low. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an injection mold for a gas meter gear with a simple structure, easy demolding and high production efficiency.

[0004] To solve the above problems, the technical solutions adopted by the present invention include: an upper template, a lower template and a gear core assembly provided between the upper template and the lower template. It is characterized in that: the gear core assembly is composed of a cavity bottom plate, a cavity cover plate and a movable cavity bottom core assembly. The cavity bottom plate is installed in the lower groove of the lower template and is provided with a tooth cavity. The cavity cover plate is installed in the upper groove of the upper template and covers the cavity bottom plate. The movable cavity bottom core assembly is movably installed at the bottom of the lower groove of the lower template and is connected to the first demolding plate at the bottom. Both ends of the first demolding plate are connected to the upper template through the first draw bar. The movable cavity bottom core assembly is composed of an outer bottom core and an inner bottom core. A gear shaft cavity is formed between the tops of the outer bottom core and the inner bottom core. The outer bottom core is composed of a first outer bottom core and a second outer bottom core. A spring piece is provided in the middle of the first outer bottom core and the second outer bottom core.

[0005] The injection mold for a gas meter gear is characterized in that: a set of ejector pins are provided around the movable cavity bottom core assembly in the lower groove of the upper template. The bottom of the ejector pins is connected to the second demolding plate. The second demolding plate is arranged below the first demolding plate and is connected to the upper template through the second draw bar.

[0006] The injection mold for a gas meter gear is characterized in that: a plastic injection guiding column extending into the tooth cavity of the cavity bottom plate is provided at the center of the bottom of the cavity cover plate. The plastic injection guiding column is communicated with the plastic injection port at the top of the upper template through a runner.

[0007] The described injection mold for gas meter gears is characterized in that: there are four cavity bottom plates on the lower template, and two tooth cavity are provided on each cavity bottom plate.

[0008] The described injection mold for gas meter gears is characterized in that: the lower template is installed with a mold bottom plate through side plates. After the upper template and the lower template are closed, the second demolding template is fixed on the mold bottom plate, and the first demolding template is fixed on the positioning step of the side plate.

[0009] The described injection mold for gas meter gears is characterized in that: guide columns for guiding and cooperating with the upper template are provided at the four outer corners of the lower template.

[0010] The described injection mold for gas meter gears is characterized in that: demolding holes are provided on the sides of the upper template and the lower template;

[0011] The described injection mold for gas meter gears is characterized in that: a group of anti - internal stress columns are provided at the bottom of the cavity cover plate corresponding to the periphery of the injection guide column.

[0012] The described injection mold for gas meter gears is characterized in that: the inner bottom core includes a central column and positioning ribs integrally formed on both sides of the central column. First positioning grooves adapted to the central column and the positioning ribs are provided on the inner walls of the first outer bottom core and the second outer bottom core.

[0013] The described injection mold for gas meter gears is characterized in that: mounting seats are provided at the bottoms of the elastic pieces of the first outer bottom core and the second outer bottom core, and second positioning grooves adapted to the central column and the positioning ribs are provided on the inner walls of the mounting seats.

[0014] The advantages of the injection mold for gas meter gears of the present invention are as follows: 1. Since the outer bottom core is elastic, to take out the gear, only the first outer bottom core and the second outer bottom core need to be separated respectively, which has the advantages of simple structure, small size, good stability and easy demolding; 2. Since the structure of the movable cavity bottom core assembly is small and compact, the mold can achieve a production mode of 1 out of 8 (even more).

[0015] The following further describes the present invention with reference to the accompanying drawings of the specification. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the injection mold for gas meter gears of the present invention;

[0017] Figure 2 is a top view of the injection mold for gas meter gears of the present invention;

[0018] Figure 3 is Figure 2 the sectional view taken along the A - A direction of

[0019] Figure 4 is Figure 2 the sectional view taken along line B-B;

[0020] Figure 5 is Figure 2 the sectional view taken along line C-C;

[0021] Figure 6 is the installation schematic diagram between the lower template of the present invention and the movable cavity bottom core assembly;

[0022] Figure 7 is the structural schematic diagram of the cavity bottom plate of the present invention;

[0023] Figure 8 is the structural schematic diagram of the cavity cover plate of the present invention;

[0024] Figure 9 is the structural schematic diagram of the movable cavity bottom core assembly of the present invention;

[0025] Figure 10 is the exploded view of the movable cavity bottom core assembly of the present invention;

[0026] Figure 11 is the structural schematic diagram of the lower template of the present invention;

[0027] Figure 12 is the structural schematic diagram of the upper template of the present invention;

[0028] Figure 13 is the enlarged installation schematic diagram between the lower template of the present invention and the movable cavity bottom core assembly;

[0029] Figure 14 is the structural schematic diagram of the gas meter gear of the present invention. Detailed implementation manners

[0030] Refer to Figures 1-13As shown in the figure, the injection mold for the gas meter gear of the present invention includes an upper template 1, a lower template 2, and a gear core assembly 3 disposed between the upper template 1 and the lower template 2. The gear core assembly 3 is composed of a cavity bottom plate 4, a cavity cover plate 5, and a movable cavity bottom core assembly 6. The cavity bottom plate 4 is installed in the lower groove 7 of the lower template 2, and the cavity bottom plate 4 is provided with a tooth cavity 8. The cavity cover plate 5 is installed in the upper groove 9 of the upper template 1 and covers the cavity bottom plate 4. The movable cavity bottom core assembly 6 is movably installed at the bottom of the lower groove 7 of the lower template 2, and the bottom of the movable cavity bottom core assembly 6 is connected to the first demolding plate 10. Both ends of the first demolding plate 10 are connected to the upper template 1 through the first draw bar 17. The movable cavity bottom core assembly 6 is composed of an outer bottom core 11 and an inner bottom core 12, and a gear shaft cavity 13 is formed between the tops of the outer bottom core 11 and the inner bottom core 12. The outer bottom core 11 is composed of a first outer bottom core 41 and a second outer bottom core 18, and a spring piece 16 is provided between the first outer bottom core 41 and the second outer bottom core 18. When the upper template 1 and the lower template 2 are demolded, the first draw bar 17 drives the first demolding plate 10 to move upward, thereby driving the movable cavity bottom core assembly 6 to move upward, and ejecting the gear in the tooth cavity 8. Finally, the outer bottom core 11 can be separated to take out the gear.

[0031] Preferably, a set of ejector pins 19 are provided around the movable cavity bottom core assembly 6 in the lower groove 7 of the upper template 1. The bottom of the ejector pins 19 is connected to the second demolding plate 20. The second demolding plate 20 is disposed below the first demolding plate 10, and the second demolding plate 20 is connected to the upper template 1 through the second draw bar 21. When the upper template 1 and the lower template 2 are demolded, the second draw bar 21 drives the second demolding plate 20 to move upward, thereby driving the ejector pins 19 to move upward, so as to more stably eject the gear in the tooth cavity 8 to ensure the quality.

[0032] Preferably, a plastic injection guiding column 22 extending into the tooth cavity 8 of the cavity bottom plate 4 is provided at the center of the bottom of the cavity cover plate 5. The plastic injection guiding column 22 is communicated with the plastic injection port 24 at the top of the upper template 1 through a runner 23. To improve the injection speed and accuracy. At the same time, after the injection is completed, a first material-saving groove 34 (commonly known as a stealing material groove) will be formed at the position of the plastic injection guiding column 22 of the gear, to prevent the deformation of the gear during the cooling process, and at the same time, it can also save materials, killing two birds with one stone.

[0033] Preferably, four cavity bottom plates 4 are provided on the lower template 2, and two tooth cavities 8 are provided on each cavity bottom plate 4. The runner 23 is communicated with the tooth cavities 8 of the cavity bottom plates 4 in a 1-out-8 manner respectively, to realize 8-station injection molding, thereby improving the production efficiency.

[0034] Preferably, the lower template 2 is provided with a mold bottom plate 26 through side plates 25. After the upper template 1 and the lower template 2 are closed, the second demolding template 20 is fixed on the mold bottom plate 26, and the first demolding template 10 is fixed on the positioning step 27 of the side plate 25. To achieve the positioning of the first demolding template 10 and the second demolding template 20, and to improve the stability of the mold.

[0035] Preferably, guide posts 28 for guiding and cooperating with the upper template 1 are provided at the four outer corners of the lower template 2. To improve the precision of closing the upper template 1 and the lower template 2.

[0036] Preferably, demolding holes 29 are provided on the sides of the upper template 1 and the lower template 2. By installing ear plates in the demolding holes 29, it is convenient to connect with the lifting mechanism for demolding.

[0037] Preferably, a group of anti - internal stress columns 33 are provided at the bottom of the cavity cover plate 5 corresponding to the periphery of the injection guiding column 22. After injection molding, a second material - saving groove 35 will be formed at the position of the anti - internal stress columns 33 for the gear, to prevent the deformation of the gear during the cooling process, and at the same time, it can also improve the injection speed and save materials, achieving multiple benefits.

[0038] Preferably, the inner bottom core 12 includes a central column 36 and positioning ribs 37 integrally formed on both sides of the central column 36. First positioning grooves 38 adapted to the central column 36 and the positioning ribs 37 are provided on the inner walls of the first outer bottom core 41 and the second outer bottom core 18. Mounting seats 39 are provided at the bottoms of the elastic pieces 16 of the first outer bottom core 41 and the second outer bottom core 18, and second positioning grooves 40 adapted to the central column 36 and the positioning ribs 37 are provided on the inner walls of the mounting seats 39. Through the connection between the mounting seat 39 and the first demolding template 10. The specific installation method is: passing the movable cavity bottom core assembly 6 from bottom to top through the riveting holes of the first demolding template 10 and then riveting. Through the above structure, the stable connection between the inner bottom core 12 and the outer bottom core 11 and the inner bottom core 12 can be achieved, and the stable connection with the first demolding template 10 can also be achieved. At the same time, a slot is formed in the middle of the gear shaft 31 of the gear at the top position of the inner bottom core 12.

[0039] The above does not impose any formal restrictions on the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, may make some changes or modifications to the above - disclosed structure and technical content to form equivalent embodiments of equivalent changes. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on 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 gas meter gear injection mold, comprising an upper mold plate (1), a lower mold plate (2), and a gear mold core assembly (3) arranged between the upper mold plate (1) and the lower mold plate (2), characterized in that: The gear mold core assembly (3) is composed of a cavity bottom plate (4), a cavity cover plate (5) and a movable cavity bottom core assembly (6); the cavity bottom plate (4) is installed in the lower groove (7) of the lower mold plate (2) and is provided with a gear cavity (8); the cavity cover plate (5) is installed in the upper groove (9) of the upper mold plate (1) and is sealed on the cavity bottom plate (4); the movable cavity bottom core assembly (6) is movably installed at the bottom of the lower groove (7) of the lower mold plate (2) and the bottom is connected to the first stripping mold plate ( 10), the first stripper plate (10) is connected to the upper plate (1) at both ends via a first drawing rod (17), the movable cavity bottom core assembly (6) is composed of an outer bottom core (11) and an inner bottom core (12), a gear shaft cavity (13) is formed between the tops of the outer bottom core (11) and the inner bottom core (12), the outer bottom core (11) is composed of a first outer bottom core (41) and a second outer bottom core (18), and a spring sheet (16) is provided in the middle of the first outer bottom core (41) and the second outer bottom core (18).

2. The gas meter gear injection mold according to claim 1, characterized in that: A group of ejector pins (19) are arranged around the movable cavity bottom core assembly (6) in the lower groove (7) of the upper mold plate (1), and the bottom of the ejector pins (19) is connected to a second stripper plate (20). The second stripper plate (20) is arranged below the first stripper plate (10) and is connected to the upper mold plate (1) via a second die drawing rod (21).

3. The gas meter gear injection mold according to claim 1, characterized in that: An injection guide column (22) extending into the gear cavity (8) of the cavity bottom plate (4) is provided at the bottom center of the cavity cover plate (5), and the injection guide column (22) is connected to the injection port (24) at the top of the upper mold plate (1) through a flow channel (23).

4. The gas meter gear injection mold according to claim 3, characterized in that: The lower mold plate (2) is provided with four cavity bottom plates (4), and each cavity bottom plate (4) is provided with two gear tooth cavities (8).

5. The gas meter gear injection mold according to claim 2, characterized in that: The lower template (2) is mounted with a mold bottom plate (26) via a side plate (25); after the upper template (1) and the lower template (2) are molded together, the second stripper plate (20) is fixed to the mold bottom plate (26), and the first stripper plate (10) is fixed to a positioning step (27) of the side plate (25).

6. The gas meter gear injection mold according to claim 1, characterized in that: Guide columns (28) for guiding and cooperating with the upper template (1) are provided at the four outer corners of the lower template (2).

7. The gas meter gear injection mold according to claim 1, characterized in that: Demoulding holes (29) are provided on the sides of the upper mould plate (1) and the lower mould plate (2).

8. The gas meter gear injection mold according to claim 3, characterized in that: A group of internal stress prevention columns (33) are provided around the bottom of the cavity cover plate (5) corresponding to the injection guide column (22).

9. The gas meter gear injection mold according to claim 1, characterized in that: The inner bottom core (12) comprises a central column (36) and positioning ribs (37) integrally formed on both sides of the central column (36), and the inner walls of the first outer bottom core (41) and the second outer bottom core (18) are provided with first positioning grooves (38) adapted to the central column (36) and the positioning ribs (37).

10. The gas meter gear injection mold according to claim 9, characterized in that: A mounting seat (39) is provided at the bottom of the spring sheet (16) of the first outer bottom core (41) and the second outer bottom core (18), and a second positioning groove (40) adapted to the central column (36) and the positioning rib (37) is provided on the inner wall of the mounting seat (39).

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