Knob post molding die for washing machine

Abstract

The application relates to a knob column forming die for a washing machine, which comprises a die base, a knob die cavity is arranged on the die base, a bottom wall of the knob die cavity is provided with a plurality of occupying blocks, the occupying blocks are evenly and spacedly arranged along the circumference of the knob die cavity; an outer edge runner is arranged between the occupying blocks and the circumferential inner wall of the knob die cavity, a side runner is arranged between the adjacent occupying blocks, a main chamber is arranged in the middle of the knob die cavity, and the occupying blocks are circumferentially arranged around the main chamber; an injection hole is arranged on the die base, one side runner is an injection runner, the injection hole is connected to the intersection of the outer edge runner and the injection runner; a throttling part is arranged on the injection runner, the throttling part blocks the injection runner, the height of the throttling part is smaller than the height of the occupying block. The application has the effect that the weld lines and the indentations are not prone to appearing on the appearance surface of the knob column after injection molding, and the weld lines are not prone to appearing on the surface of the knob column.

Description

Technical Field

[0001] This application relates to the field of molds for washing machine parts, and more particularly to a mold for forming a knob post for a washing machine. Background Technology

[0002] Washing machines are indispensable appliances in modern households, completely liberating people from the arduous task of hand-washing clothes. The knob is the direct operating component for users to select washing programs and set washing intensity. The key internal structure supporting and transmitting this instruction is the knob post. The knob post is typically a sturdy cylindrical structure, with one end connected to the knob on the front panel and the other end connected to the internal program controller (mechanical or computer board). The knob post is primarily injection molded using an injection molding machine. During injection molding, material is injected into the molding cavity through a runner, and the injected material flows into various parts of the molding cavity.

[0003] In common knob pillars, part of the shaft is exposed for the user to hold and turn. The exposed surface area of ​​the knob pillar requires high aesthetic standards. The bottom of the knob usually has a insertion hole for connecting the rotating shaft. This insertion hole is formed by a spacer block within the injection mold. However, due to the presence of the spacer block, flow diversion occurs during injection molding, making weld lines prone to appear on the surface of the molded knob pillar. These defects easily appear on the surface, affecting the aesthetics of the knob pillar. Summary of the Invention

[0004] To prevent weld lines from appearing on the surface of the knob post, this application provides a knob post molding die for a washing machine.

[0005] This application provides a molding die for a washing machine knob post, which adopts the following technical solution:

[0006] A mold for forming a knob post for a washing machine includes a mold base, on which a knob cavity is provided, and a spacer block is provided on the bottom wall of the knob cavity. The mold base is characterized by having several spacer blocks evenly spaced along the circumference of the knob cavity; an outer flow channel is provided between the spacer block and the inner circumferential wall of the knob cavity, and a side flow channel is provided between adjacent spacer blocks; a main chamber is provided in the center of the knob cavity, and the spacer blocks surround the main chamber circumferentially; an injection hole is provided on the mold base, one of the side flow channels being an injection channel, and the injection hole is connected to the intersection of the outer flow channel and the injection channel; a throttling section is provided on the injection channel, the throttling section blocking the injection channel, and the height of the throttling section being less than the height of the spacer block.

[0007] By adopting the above technical solution, during the injection molding of the knob post mold, the raw material is ejected from the injection runner and flows outward along the runner through the side runner. The placeholder block obstructs the flow of the raw material. The throttling part is set near the injection runner opening and between two adjacent placeholder blocks. The throttling part and the placeholder block reduce the speed at which the raw material flows to the center of the molding cavity. The raw material first flows to the outer runner, which is used for injection molding of the knob post's outer surface. The raw material is mainly injected along the circumferential edge and slowly fills the center of the main cavity. After injection molding, weld lines and indentations are less likely to appear on the outer surface of the knob post, and weld lines are less likely to appear on the knob post surface.

[0008] Optionally, the throttling section includes a throttling block one and two throttling blocks two disposed on the side of the throttling block one away from the main chamber. The two throttling blocks two are respectively close to the sidewalls of the two occupant blocks. A groove is formed between the throttling block one and the two throttling blocks two, and the opening of the groove is close to the edge of the side flow channel.

[0009] By adopting the above technical solution, the flow of material to the middle of the main chamber is greatly reduced by throttling block one and throttling block two. The flow of material is slow to fill the main chamber from the edge, controlling the flow of material and avoiding weld lines from forming on the surface during injection molding.

[0010] Optionally, a break block is provided inside the mold base, and the break block is located on the outer edge of the flow channel.

[0011] By adopting the above technical solution, the weld line and indentation at the connection point are avoided after the material fills the outer flow channel.

[0012] Optionally, the mold base has several guide grooves in the inner circumference, and the material raw material in the side flow channel flows to the outer edge flow channel through the guide grooves.

[0013] By adopting the above technical solution, the speed at which raw materials flow to the outer edge channel is accelerated by the guide groove, and the structure after the guide groove is formed facilitates the improvement of the structural strength of the knob column.

[0014] Optionally, a locking block is provided on the side of the placeholder block near the center.

[0015] By adopting the above technical solution, the locking block facilitates the installation and positioning of the knob post with the washing machine components after it has been formed.

[0016] Optionally, the mold base is provided with mounting posts.

[0017] By adopting the above technical solution, the mounting holes formed by the mounting post facilitate the installation and fixation of the knob post to the washing machine parts after it has been formed.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. During injection molding of the knob post mold, the raw material is ejected from the injection channel, passes through the throttling part and the stationary block, and the raw material first flows to the outer edge channel. The outer edge channel is used for injection molding of the knob post's outer surface. The raw material is mainly injected along the circumferential edge and slowly fills the center of the main cavity. After injection molding, weld lines and indentations are not easy to appear on the outer surface of the knob post, and weld lines are not easy to appear on the surface of the knob post.

[0020] 2. By using throttling block one and throttling block two, the flow of material to the middle of the main chamber is greatly reduced, the flow direction of material is controlled, and the weld line is avoided from forming on the appearance surface during injection molding;

[0021] 3. The break block prevents weld lines and indentations from forming at the joint after the material fills the outer flow channel. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the knob post molding die for a washing machine according to an embodiment.

[0023] Figure 2 This is a partial structural diagram of the mold base in the embodiment. Figure 1 This mainly showcases the lower half of the mold base.

[0024] Figure 3 This is a partial structural diagram of the mold base in the embodiment. Figure 2 This mainly showcases the upper part of the mold base.

[0025] Figure 4 This is a cross-sectional view of the mold for forming the knob post of the washing machine according to an embodiment.

[0026] Figure 5 yes Figure 4 A magnified view of a portion at point A.

[0027] Figure 6 This is a schematic diagram of the product structure after molding, as shown in the embodiment.

[0028] Explanation of reference numerals in the attached drawings: 1. Mold base; 2. Knob mold cavity; 3. Placeholder block; 41. Outer edge runner; 42. Side runner; 5. Main chamber; 61. Injection hole; 62. Injection runner; 7. Throttling section; 71. Throttling block one; 72. Throttling block two; 81. Groove; 82. Break block; 83. Guide groove; 84. Locking block; 85. Mounting post. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings.

[0030] This application discloses a mold for forming a knob post for a washing machine. (Refer to...) Figure 1The washing machine knob mold includes a mold base 1, a knob cavity 2 on the mold base 1, and a number of spacer blocks 3 fixed to the bottom wall of the knob cavity 2. The spacer blocks 3 are evenly spaced along the circumference of the knob cavity 2. A retaining block 84 is fixed on the side of the spacer block 3 near the center. An mounting post 85 is fixed inside the mold base 1. An outer flow channel 41 is formed between the spacer block 3 and the inner circumference of the knob cavity 2, and a side flow channel 42 is formed between adjacent spacer blocks 3. A main chamber 5 is formed in the center of the knob cavity 2, and the spacer blocks 3 are arranged around the circumference of the main chamber 5.

[0031] The mold base 1 has an injection hole 61, one of which is a side runner 42, which is an injection runner 62. The injection hole 61 is connected to the intersection of the outer runner 41 and the injection runner 62. A break block 82 is fixed inside the mold base 1, and the break block 82 is located in the outer runner 41. Several guide grooves 83 are formed in the circumferential direction inside the mold base 1, and the material raw material in the side runner 42 flows to the outer runner 41 through the guide grooves 83.

[0032] A throttling section 7 is fixed on the injection flow channel 62, which blocks the injection flow channel 62. The height of the throttling section 7 is less than the height of the occupant block 3. The throttling section 7 includes a first throttling block 71 and two second throttling blocks 72 fixed to the side of the first throttling block 71 away from the main chamber 5. The two second throttling blocks 72 are respectively close to the side walls of the two occupant blocks 3. A groove 81 is formed between the first throttling block 71 and the two second throttling blocks 72. The opening of the groove 81 is close to the edge of the side flow channel 42.

[0033] The implementation principle of a knob post molding die for a washing machine according to an embodiment of this application is as follows: When the knob post mold is injection molded, the raw material is injected, and through the throttling part 7 and the occupant block 3, only a small amount of raw material flows to the main cavity 5, which greatly reduces the speed at which the raw material flows to the main cavity 5. Most of the raw material flows into the outer edge flow channel 41 through the injection channel 62 and the side flow channel. The flow channel accelerates the speed at which the raw material flows to the outer edge flow channel 41. The outer edge flow channel 41 is used for injection molding of the outer surface of the knob post. The raw material is mainly injected along the circumferential edge and slowly fills the center of the main cavity 5. After the outer edge flow channel 41 and the side flow channel are filled, it flows into the main cavity 5. After injection molding, weld lines and indentations are not easy to appear on the outer surface of the knob post, and weld lines are not easy to appear on the surface of the knob post.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mold for forming a knob post for a washing machine, comprising a mold base (1), wherein a knob cavity (2) is provided on the mold base (1), and a spacer block (3) is provided on the bottom wall of the knob cavity (2), characterized in that: The spacer blocks (3) are provided in a plurality of manner, and the spacer blocks (3) are evenly spaced along the circumference of the knob cavity (2); an outer flow channel (41) is provided between the spacer blocks (3) and the inner wall of the knob cavity (2), and a side flow channel (42) is provided between adjacent spacer blocks (3); a main cavity (5) is provided in the middle of the knob cavity (2), and the spacer blocks (3) surround the main cavity (5) circumferentially; an injection hole (61) is provided on the mold base (1), one of the side flow channels (42) is an injection flow channel (62), and the injection hole (61) is connected to the intersection of the outer flow channel (41) and the injection flow channel (62); a throttling part (7) is provided on the injection flow channel (62), and the throttling part (7) blocks the injection flow channel (62), and the height of the throttling part (7) is less than the height of the spacer block (3).

2. The mold for forming a knob post for a washing machine according to claim 1, characterized in that: The throttling section (7) includes a throttling block one (71) and two throttling blocks two (72) disposed on the side of the throttling block one (71) away from the main chamber (5). The two throttling blocks two (72) are respectively close to the side walls of the two occupant blocks (3). A groove (81) is formed between the throttling block one (71) and the two throttling blocks two (72). The opening of the groove (81) is close to the edge of the side flow channel (42).

3. The mold for forming a knob post for a washing machine according to claim 1, characterized in that: A break block (82) is provided inside the mold base (1), and the break block (82) is located in the outer flow channel (41).

4. The mold for forming a knob post for a washing machine according to claim 1, characterized in that: The mold base (1) has several guide grooves (83) in the inner circumference, and the material raw material in the side flow channel (42) flows to the outer edge flow channel (41) through the guide grooves (83).

5. The mold for forming a knob post for a washing machine according to claim 1, characterized in that: The occupant block (3) has a locking block (84) on the side near the center.

6. The mold for forming a knob post for a washing machine according to claim 1, characterized in that: The mold base (1) is provided with an installation column (85).

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