Injection mold for injection molding knob

Abstract

The utility model relates to the technical field of injection molds, in particular to an injection mold for injection molding of a knob. Comprising a lower die base and an upper die base, a lower die core is mounted at the top of the lower die base, and a first forming cavity for forming a knob is concavely formed in the top of the lower die core; an upper mold core capable of moving up and down is mounted at the bottom of the upper mold base, and a first forming insert for forming a knob is mounted on the upper mold core; when the upper mold base moves downwards relative to the lower mold base for mold closing, the first forming insert can be inserted into the first forming cavity and performs injection molding on the knob; a first pulling plate capable of moving up and down is installed at the bottom of the upper mold core, and after the upper mold base moves upwards relative to the lower mold base to open the mold, the first pulling plate can be pulled to move downwards so as to eject the knob. Compared with the prior art, the problem that damage exists when an ejector pin is used for ejecting the back side face of the knob in the prior art is solved, and the production reliability and the production yield of knob injection molding are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold for injection molding a knob. Background Art

[0002] Injection molds are tools for producing plastic products; they are also tools that give plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to injecting heated and molten material into the mold cavity under high pressure, and then cooling and solidifying to obtain a molded product.

[0003] In the prior art, if the mold for injection molding a knob is filled with glue on the knob's exterior surface, the knob will have glue residue, and grinding equipment will be needed to remove the residual glue. If the runner is changed to center injection, the runner needs to be set on the back of the knob. In this case, the ejector can only be ejected from the back of the knob, which can easily damage the knob.

[0004] Therefore, it is necessary to study a new technical solution to solve the above problems. Utility Model Content

[0005] In view of this, the utility model aims to solve the deficiencies in the prior art, and its main purpose is to provide an injection mold for injection molding knobs, which effectively solves the technical defects of the injection molds used for injection molding knobs in the prior art, such as residual glue on the knob surface or easy damage to the knob, thereby improving the production reliability and production efficiency of the injection molds.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an injection mold for injection molding a knob, comprising a lower mold base and an upper mold base movably installed on the top of the lower mold base, a lower mold core is installed on the top of the lower mold base, and a first molding cavity for molding the knob is recessed on the top of the lower mold core; an upper mold core that can move up and down is installed on the bottom of the upper mold base, and a first molding insert for molding the knob is installed on the upper mold core; when the upper mold base is moved down relative to the lower mold base to close the mold, the first molding insert can be inserted into the first molding cavity and injection mold the knob; a first pull plate that can move up and down is installed on the bottom of the upper mold core, and when the upper mold base is moved away from the mold relative to the lower mold base, the first pull plate can be pulled downward to eject the knob.

[0007] The beneficial effects of the injection mold for injection molding a knob provided in the present application are as follows: compared with the prior art, an upper mold core that can be moved up and down is provided, and a first pull plate that can be moved up and down is installed at the bottom of the lower mold core; when the upper mold base is moved up relative to the lower mold base to open the mold, the first pull plate can be driven to move downward relative to the upper mold core at the same time to eject the knob from the first molding insert; during this mold opening process, there is no need to use an ejector pin to eject the knob, so as to solve the problem of damage to the back side of the knob when the ejector pin is used to eject the knob in the traditional technology, thereby improving the production reliability and production yield of the knob injection molding; at the same time, during this mold opening process, there is no need to set an ejector plate structure, which eliminates the mold opening action of ejecting and returning the ejector plate, shortens the mold opening time, and thus improves production efficiency.

[0008] As a preferred solution: the first pull plate is provided with a first through hole penetrating the upper and lower surfaces thereof, the first molding insert can extend downward through the first through hole, and the bottom of the first molding insert protrudes from the bottom of the first pull plate.

[0009] As a preferred solution: the width of the first through hole is smaller than the width of the first molding cavity, so that the first pull plate constitutes a first ejection portion; when the first pull plate moves downward, the knob can be ejected from the first molding insert.

[0010] As a preferred solution: the first pull plate is connected to the first pull rod, and the bottom of the first pull rod is provided with a first limiting protrusion ring; the lower die core is provided with a first limiting hole, and the first limiting protrusion ring can be movably inserted into the first limiting hole; when the upper die base moves upward relative to the lower die base, the first limiting protrusion ring abuts against the top of the first limiting hole and pulls the first pull rod to move downward.

[0011] As a preferred solution: a first stroke limiting rod is installed on the top of the first pulling plate, and the upper die core is provided with a first stroke limiting hole for the first stroke limiting rod to be inserted.

[0012] As a preferred solution: the upper die base is provided with a first guide rod, the lower die base is provided with a first guide hole, and the first guide rod can be movably inserted into the first guide hole.

[0013] As a preferred solution: the upper mold base is provided with a first pouring port, the upper mold core is provided with a first flow channel, and the first flow channel runs through the bottom of the first molding insert; when the upper mold base and the lower mold base are molded together, the bottom of the first flow channel is conductively connected to the first molding cavity.

[0014] As a preferred solution: it also includes a sprue plate, which is arranged at the bottom of the upper mold base and the top of the upper mold core. The sprue plate is provided with a second flow channel, one end of the second flow channel is connected to the first pouring port, and the other end is connected to the first flow channel.

[0015] As a preferred solution: a second pull rod is provided at the bottom of the nozzle plate, and a second limiting convex ring is provided at the bottom of the second pull rod; the upper mold core is provided with a second limiting hole, and the second limiting convex ring can be movably inserted into the second limiting hole; when the upper mold base moves upward, the upper mold core moves downward relative to the upper mold base and pulls the nozzle plate downward to push out the nozzle material.

[0016] As a preferred solution: a second stroke limiting rod is provided on the top of the nozzle plate, and a second stroke limiting hole is provided on the upper mold base for movably inserting the second stroke limiting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 is a schematic diagram of the three-dimensional structure of an injection mold for injection molding a knob provided in an embodiment of the present application;

[0019] Figure 2 yes Figure 1 A partial structural cross-sectional view of an injection mold for injection molding a knob is shown;

[0020] Figure 3 yes Figure 2 A partial enlarged view of the injection mold for injection molding the knob shown;

[0021] Figure 4 yes Figure 1 A schematic diagram of the working of an injection mold for injection molding a knob is shown;

[0022] Figure 5 yes Figure 4 A further working schematic diagram of an injection mold for injection molding a knob is shown;

[0023] Figure 6 yes Figure 5 A further working schematic diagram of an injection mold for injection molding a knob is shown;

[0024] Figure 7 yes Figure 6 A schematic diagram of further working of an injection mold for injection molding a knob is shown.

[0025] Among them, the reference numerals in the figure are:

[0026] 10. lower die seat; 11. lower die core; 111. first limiting hole; 12. first molding cavity; 14. first guide hole;

[0027] 20. upper die seat; 21. upper die core; 211. first stroke limiting hole; 212. first flow channel; 213. second stroke limiting hole; 22. first molding insert; 23. first pull plate; 231. first through hole; 232. first ejector; 233. first pull rod; 234. first limiting convex ring; 235. first stroke limiting rod; 236. second limiting hole; 24. first guide rod; 25. first pouring gate; 26. nozzle plate; 261. second flow channel; 262. second pull rod; 263. second limiting convex ring; 264. second stroke limiting rod;

[0028] 30. Knob; 40. Water outlet material. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0031] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] Please also read Figures 1 to 7Now, the injection mold for injection molding a knob provided in the embodiment of the present application is described. The injection mold for injection molding a knob comprises: a lower mold base 10 and an upper mold base 20 .

[0035] The upper mold base 20 is movably installed on the top of the lower mold base 10. When the upper mold base 20 and the lower mold base 10 are closed, the knob 30 can be injection molded; wherein, a lower mold core 11 is installed on the top of the lower mold base 10, and a first molding cavity 12 for molding the knob 30 is recessed on the top of the lower mold core 11; an upper mold core 21 that can move up and down is installed at the bottom of the upper mold base 20, and the upper mold core 21 is installed with a first molding insert 22 for molding the knob 30; when the upper mold base 20 is moved down relative to the lower mold base 10 to close the mold, the first molding insert 22 can be inserted into the first molding cavity 12 and injection mold the knob 30; a first pull plate 23 that can move up and down is installed at the bottom of the upper mold core 21, and when the upper mold base 20 is removed from the mold relative to the lower mold base 10, the first pull plate 23 can be pulled downward to eject the knob 30.

[0036] Specifically, an upper mold core 21 that can move up and down is set, and a first pull plate 23 that can move up and down is installed at the bottom of the lower mold core 11; when the upper mold base 20 is moved up relative to the lower mold base 10 to open the mold, the first pull plate 23 can be driven to move downward relative to the upper mold core 21 to eject the knob 30 from the first molding insert 22; during this mold opening process, there is no need to use an ejector pin to eject the knob 30, so as to solve the problem of damage to the back side of the knob 30 when the ejector pin is used to eject the knob 30 in the traditional technology, thereby improving the production reliability and production yield of the injection molding of the knob 30; at the same time, during this mold opening process, there is no need to set an ejector plate structure, which eliminates the mold opening action of the ejector plate ejecting and returning, shortens the mold opening time, and thus improves production efficiency.

[0037] In some embodiments of the present application, the first pull plate 23 is provided with a first through hole 231 penetrating through the upper and lower surfaces thereof, and the first molding insert 22 can extend downward through the first through hole 231, and the bottom of the first molding insert 22 protrudes from the bottom of the first pull plate 23. When the upper mold base 20 moves downward relative to the lower mold base 10, the upper mold base 20 and the lower mold base 10 can be molded together, and at this time, the bottom of the first molding insert 22 is inserted into the first molding cavity 12 to enclose a cavity for injection molding the knob 30, and hot melt slurry is injected into the first molding cavity 12, and after a waiting period of cooling and solidification, the knob 30 body can be obtained.

[0038] Specifically, the width of the first through hole 231 is smaller than the width of the first molding cavity 12, so that the first pull plate 23 constitutes a first ejection portion 232; when the first pull plate 23 moves downward, the knob 30 can be ejected from the first molding insert 22. Preferably, the first pull plate 23 is connected to a first pull rod 233, and a first limiting protrusion 234 is provided at the bottom of the first pull rod 233; the lower mold core 11 is provided with a first limiting hole 111, and the first limiting protrusion 234 can be movably inserted into the first limiting hole 111; when the upper mold base 20 moves upward relative to the lower mold base 10, the first limiting protrusion 234 abuts against the top of the first limiting hole 111 and pulls the first pull rod 233 to move downward.

[0039] It should be noted that the width of the top opening of the first limiting hole 111 is smaller than the width of the first limiting protrusion 234, so that the first limiting protrusion 234 can only move up and down in the first limiting hole 111, and will not be separated from the top of the first limiting hole 111. When the upper mold base 20 moves upward, the first limiting protrusion 234 abuts against the top of the first limiting hole 111, and the first pull rod 233 pulls the first pull plate 23 downward, so that the first pull plate 23 pushes the knob 30 downward from the bottom of the first molding insert 22 to complete the demoulding operation of the knob 30.

[0040] Moreover, since the first molding cavity 12 is used to mold the shape of the knob 30, and the side surface of the first molding cavity 12 is inclined outward from bottom to top, during the mold opening process, the knob 30 will first be demolded from the first molding cavity 12, and then the knob 30 attached to the first molding insert 22 will be ejected and demolded through the first pull plate 23.

[0041] Furthermore, a first stroke limiting rod 235 is installed on the top of the first pull plate 23, and the upper mold core 21 is provided with a first stroke limiting hole 211 for inserting the first stroke limiting rod 235. The first stroke limiting rod 235 is used to limit the downward movement distance of the first pull plate 23 to ensure that the upper mold base 20 will not completely separate from the upper mold base 20 when moving up and down, so as to facilitate the next mold closing operation.

[0042] In some embodiments of the present application, the upper mold base 20 is provided with a first guide rod 24, and the lower mold base 10 is provided with a first guide hole 14, and the first guide rod 24 can be movably inserted into the first guide hole 14. The upper mold base 20 is provided with a first pouring port 25, and the upper mold core 21 is provided with a first flow channel 212, and the first flow channel 212 runs through the bottom of the first molding insert 22; when the upper mold base 20 and the lower mold base 10 are molded, the bottom of the first flow channel 212 is conductively connected to the first molding cavity 12.

[0043] By setting a first flow channel, and the first flow channel passing through the bottom of the first molding insert, the hot melt slurry is injected from the center of the knob with the help of the first insert; there is no need to inject glue on the outer surface of the knob, so as to solve the technical problem of residual glue on the knob surface in traditional technology, and improve the surface flatness of the knob.

[0044] In some other embodiments of the present application, a nozzle plate 26 is further included. The nozzle plate 26 is disposed at the bottom of the upper mold base 20 and the top of the upper mold core 21. The nozzle plate 26 is provided with a second flow channel 261. One end of the second flow channel 261 is conductively connected to the first pouring port 25, and the other end is conductively connected to the first flow channel 212. A second tie rod 262 is provided at the bottom of the nozzle plate 26, and a second limiting convex ring 263 is provided at the bottom of the second tie rod 262; the upper mold core 21 is provided with a second limiting hole 236, and the second limiting convex ring 263 can be movably inserted into the second limiting hole 236; when the upper mold base 20 moves up, the upper mold core 21 moves down relative to the upper mold base 20 and pulls the nozzle plate 26 to move downward to push out the nozzle material 40. A second stroke limiting rod 264 is provided on the top of the nozzle plate 26, and the upper mold base 20 is provided with a second stroke limiting hole 213 for movably inserting the second stroke limiting rod 264. The functions of the second stroke limiting rod 264 and the second stroke limiting rod 264 are the same as those of the first stroke limiting rod 235 and the first stroke limiting hole 211, which will not be repeated here.

[0045] Please also read Figures 4 to 7 The working principle of the injection mold for injection molding the knob 30 provided in the present application is described in detail as follows:

[0046] First, the upper die base 20 is driven to move downward relative to the lower die base 10 to complete the mold closing operation;

[0047] Then, the hot melt slurry is injected from the first pouring port, flows through the second flow channel 261 and the first flow channel 212 and enters the first molding cavity 12, and the hot melt slurry is cooled and solidified to form the knob 30;

[0048] Furthermore, the upper mold base 20 is driven to move upward relative to the lower mold base 10, and the nozzle material 40 is pulled to separate from the first flow channel 212 and the second flow channel 261; after the upper mold base 20 moves upward for a certain distance, the second limiting protrusion 263 of the second pull rod 262 abuts against the top of the second limiting hole 236, and the nozzle plate 26 is pulled downward relative to the upper mold base 20, so as to eject the nozzle material 40 from the first pouring port;

[0049] Then, the upper die base 20 is driven to move upward relative to the lower die base 10, and the upper die core 21 is pulled upward by the second pull rod 262, so that the knob 30 is separated from the first molding cavity 12 and attached to the bottom of the first molding insert 22;

[0050] Furthermore, the upper die base 20 is continuously driven to move upward relative to the lower die base 10; after the upper die base 20 moves upward a certain distance, the first limiting protrusion 234 of the first pull rod 233 abuts against the top of the first limiting hole 111, and pulls the first pull rod 233 downward relative to the upper die core 21, so as to eject the knob 30 from the first molding insert;

[0051] By repeating the above steps, the injection molding operation of the knob 30 can be continuously completed.

[0052] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. An injection mold for injection molding a knob, comprising a lower mold base (10) and an upper mold base (20) movably mounted on the top of the lower mold base (10), characterized in that: A lower mold core (11) is mounted on the top of the lower mold base (10), and a first molding cavity (12) for molding a knob is recessed on the top of the lower mold core (11); an upper mold core (21) movable up and down is mounted on the bottom of the upper mold base (20), and a first molding insert (22) for molding a knob is mounted on the upper mold core (21); when the upper mold base (20) moves downward relative to the lower mold base (10) to close the mold, the first molding insert (22) can be inserted into the first molding cavity (12) and the knob can be injection molded; A first pull plate (23) that can move up and down is installed at the bottom of the upper die core (21); when the upper die base (20) is displaced relative to the lower die base (10), the first pull plate (23) can be pulled downward to eject the knob.

2. The injection mold for injection molding a knob according to claim 1, characterized in that: The first pull plate (23) is provided with a first through hole (231) penetrating the upper and lower surfaces thereof, and the first molding insert (22) can extend downward through the first through hole (231), with the bottom of the first molding insert (22) protruding from the bottom of the first pull plate (23).

3. The injection mold for injection molding a knob according to claim 2, characterized in that: The width of the first through hole (231) is smaller than the width of the first molding cavity (12), so that the first pull plate (23) forms a first ejection portion (232); when the first pull plate (23) moves downward, the knob (30) can be ejected from the first molding insert (22).

4. The injection mold for injection molding a knob according to claim 1, characterized in that: The first pull plate (23) is connected to a first pull rod (233), and a first limiting protruding ring (234) is provided at the bottom of the first pull rod (233); The lower die core (11) is provided with a first limiting hole (111), and the first limiting protrusion ring (234) is movably inserted into the first limiting hole (111); when the upper die base (20) moves upward relative to the lower die base (10), the first limiting protrusion ring (234) abuts against the top of the first limiting hole (111) and pulls the first pull rod (233) to move downward.

5. The injection mold for injection molding a knob according to claim 4, characterized in that: A first stroke limiting rod (235) is installed on the top of the first pulling plate (23), and the upper die core (21) is provided with a first stroke limiting hole (211) for inserting the first stroke limiting rod (235).

6. The injection mold for injection molding a knob according to claim 1, characterized in that: The upper die base (20) is provided with a first guide rod (24), and the lower die base (10) is provided with a first guide hole (14), and the first guide rod (24) is movably inserted into the first guide hole (14).

7. The injection mold for injection molding a knob according to claim 1, characterized in that: The upper mold base (20) is provided with a first pouring port (25), and the upper mold core (21) is provided with a first flow channel (212), the first flow channel (212) penetrating the bottom of the first molding insert (22); when the upper mold base (20) and the lower mold base (10) are molded together, the bottom of the first flow channel (212) is conductively connected to the first molding cavity (12).

8. The injection mold for injection molding a knob according to claim 7, characterized in that: It also includes a nozzle plate (26), the nozzle plate (26) being arranged at the bottom of the upper mold base (20) and the top of the upper mold core (21), the nozzle plate (26) being provided with a second flow channel (261), one end of the second flow channel (261) being conductively connected to the first pouring port (25), and the other end of the second flow channel (212).

9. The injection mold for injection molding a knob according to claim 8, characterized in that: A second pull rod (262) is provided at the bottom of the nozzle plate (26), and a second limiting protruding ring (263) is provided at the bottom of the second pull rod (262); The upper die core (21) is provided with a second limiting hole (236), and the second limiting protruding ring (263) is movably inserted into the second limiting hole (236); when the upper die base (20) moves upward, the upper die core (21) moves downward relative to the upper die base (20) and pulls the nozzle plate (26) downward to push out the nozzle material.

10. The injection mold for injection molding a knob according to claim 9, characterized in that: A second stroke limiting rod (264) is provided on the top of the nozzle plate (26), and the upper die base (20) is provided with a second stroke limiting hole (213) for movably inserting the second stroke limiting rod (264).

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