Closestool plug injection mold

Abstract

The utility model discloses a closestool plug injection mold which comprises an upper mold set, a lower mold set and a mold core, the upper mold set is provided with a glue injection nozzle communicated with an injection machine, and the glue injection nozzle is communicated with a product forming cavity of the mold core and used for guiding injection molding glue liquid; an upper mold core of the mold core is provided with a sprue bush, and the sprue bush is provided with a sprue spring; after the glue solution is injected, the sprue spring drives the sprue bush to move away from the upper mold core, air is guided into the air guide groove of the sprue bush, and the vacuum negative pressure state of the upper mold core is relieved; a lower die core of the die core is provided with an air guide sleeve, the air guide sleeve is sleeved with an ejector sleeve of the lower die set, the ejector sleeve is provided with an air guide groove, and the air guide groove is communicated with an air guide hole of the air guide sleeve; and air is introduced into the ejector sleeve for ejection displacement through the air guide groove and the air guide hole, so that the vacuum negative pressure state of the lower mold core is relieved, and the technical problems existing in the prior art are solved.

Description

Technical Field

[0001] This utility model relates to injection molds, and more particularly to a toilet plunger injection mold. Background Technology

[0002] like Figure 1 The product shown is a rubber part, a toilet plunger. It is bowl-shaped and made of soft rubber. It uses negative pressure to unclog the toilet pipe, thus effectively preventing blockages in the toilet drain. It is a relatively traditional, inexpensive, and practical household tool.

[0003] Considering the characteristics of toilet plungers: 1. The toilet plunger belt is made entirely of TPR soft rubber; 2. The smooth rubber of the toilet plunger mold makes it extremely easy to stretch during the molding process; This creates a local vacuum in the plastic and the cavity, pulling the product and causing it to deform and stretch, resulting in a high product defect rate.

[0004] Therefore, how to solve the product quality problems caused by the vacuum negative pressure state during the injection molding process of toilet plungers is one of the technical problems that need to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to provide a toilet plunger injection mold.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A toilet plunger injection mold includes an upper mold assembly, a lower mold assembly, and a mold core. The upper mold assembly has a glue injection nozzle connected to an injection machine. The glue injection nozzle is connected to the product molding cavity of the mold core for introducing injection molding liquid.

[0008] The upper mold core of the mold core is equipped with a sprue sleeve, and the sprue sleeve is equipped with a sprue spring; after the glue is injected, the sprue spring drives the sprue sleeve to move away from the upper mold core, and the air guide groove of the sprue sleeve introduces air to release the vacuum negative pressure state of the upper mold core.

[0009] The lower mold core of the mold core is provided with an air guide sleeve, which is fitted with the ejector sleeve of the lower mold assembly. The ejector sleeve is provided with an air guide groove, which is connected to the air guide hole of the air guide sleeve. The ejector sleeve, which is displaced by ejection, introduces air through the air guide groove and the air guide hole to release the vacuum negative pressure state of the lower mold core.

[0010] More preferably, the ejector sleeve includes an ejector sleeve and an inner ejector needle that fit together;

[0011] The air guide groove is formed on the outer wall of the sleeve, and the air guide groove is correspondingly arranged with the air guide hole.

[0012] More preferably, the two air guide grooves are symmetrically distributed.

[0013] More preferably, the air guide groove is a strip-shaped groove and is opened along the ejector sleeve's ejection displacement direction.

[0014] More preferably, the lower module includes a lower template, a square iron, a base plate, and an ejection mechanism, wherein:

[0015] The lower template is fixedly connected to the base plate by square iron and encloses a protruding cavity;

[0016] The inner needle of the ejector sleeve is connected to the base plate;

[0017] The ejection mechanism includes an ejection plate assembly and the ejector sleeve. The ejection plate assembly is inserted into the ejection cavity. The outer sleeve of the ejector sleeve is connected to the ejection plate assembly and is driven by the ejection plate assembly to perform ejection displacement along the guide of the inner needle of the ejector sleeve.

[0018] More preferably, the upper mold core is provided with an inlet hole, which connects the injection nozzle and the product molding cavity;

[0019] The sprue sleeve is inserted into the inlet hole, and the sprue spring is fitted onto the sprue sleeve;

[0020] The two ends of the sprue spring abut against the inner wall of the sprue sleeve and the inlet hole, respectively.

[0021] By adopting the above technical solution, this utility model has the following advantages compared with the prior art:

[0022] 1. This utility model adopts a floating sprue sleeve structure, which can drive the sprue sleeve away from the upper mold core after the glue is injected. The air guide groove of the sprue sleeve introduces air and releases the vacuum negative pressure state of the upper mold core.

[0023] 2. In addition, this utility model also adopts the cooperation of ejector sleeve and air guide sleeve. When the ejector sleeve is driven to perform ejection displacement, air is introduced through air guide groove and air guide hole to release the vacuum negative pressure state of the lower mold core, ensuring that the product is intact and quickly formed, achieving the purpose of high product qualification rate and continuous processing, thereby effectively improving processing efficiency and reducing processing costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the product structure;

[0025] Figure 2 This is a three-dimensional structural diagram illustrating the meaning of the toilet plunger injection mold described in this embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the internal structure of the toilet plunger injection mold in the mold-closed state according to an embodiment of the present invention;

[0027] Figure 4This is a schematic diagram of the internal structure of the toilet plug injection mold in the embodiment of this utility model, in the state after product molding and before mold opening;

[0028] Figure 5 This is a schematic diagram of the internal structure of the toilet plug injection mold in the product ejection and demolding state according to the embodiment of this utility model;

[0029] Figure 6 yes Figure 5 Enlarged view of the structure at point Q in the diagram;

[0030] Figure 7 This is a schematic diagram of the sleeve structure described in the embodiment of this utility model;

[0031] Figure 8 yes Figure 7 A cross-sectional schematic diagram of the structure shown.

[0032] The markings on the accompanying drawings in the above specification are explained as follows:

[0033] 110. Top plate; 120. Upper template; 130. Glue injection nozzle;

[0034] 210. Lower template; 220. Square iron; 230. Base plate; 240. Ejector mechanism; 241. Ejector plate assembly; 242. Sleeve sleeve; 243. Sleeve inner needle; 244. Air guide groove;

[0035] 310. Upper mold core; 320. Lower mold core;

[0036] 410. Sprue bushing; 420. Sprue spring;

[0037] 500, air guide sleeve; 510, air guide hole;

[0038] A. Products. Detailed Implementation

[0039] Product A (i.e., toilet plunger) Figure 1 As shown, the toilet seat is bowl-shaped and made of soft rubber. It uses negative pressure to unclog toilet drains, effectively preventing blockages. It is a relatively traditional, inexpensive, and practical household tool. Because the toilet seat is made entirely of TPR soft rubber, the smooth surface makes it easily stretched during molding. This creates a localized vacuum in the plastic and mold cavity, pulling and stretching product A, resulting in a high defect rate.

[0040] like Figures 2 to 8As shown, this utility model discloses a toilet plug injection mold, which uses a floating sprue sleeve 410 to solve the problem of vacuum negative pressure forming of product A before the mold opens, and also uses an ejection mechanism 240 to solve the problem of vacuum negative pressure forming of product A after the mold opens and during the ejection operation, ensuring that product A is intact and quickly formed, achieving a high product A qualification rate and realizing continuous processing, thereby effectively improving processing efficiency and reducing processing costs.

[0041] like Figure 1 and Figure 2 As shown, the toilet plunger injection mold includes a mold frame and a mold core. The mold core is installed in the mold frame. Specifically, the mold core includes an upper mold core 310 and a lower mold core 320 that are interlocked with each other. The mold frame includes an upper mold assembly and a lower mold assembly. The upper mold core 310 is installed in the upper mold assembly, and the lower mold core 320 is installed in the lower mold assembly. The mold core is provided with a product molding cavity that is compatible with product A.

[0042] like Figure 1 and Figure 2 As shown, the upper mold assembly includes a top plate 110 and an upper template 120. The top plate 110 and the upper template 120 are fixedly connected and move synchronously. The upper template 120 has an upper mold core groove on the side facing the lower mold assembly. The upper mold core 310 is embedded in the upper mold core groove, that is, the upper mold core 310 is installed in the upper mold assembly and moves with the upper mold assembly. The upper mold assembly is equipped with a glue injection nozzle 130. The glue injection nozzle 130 is externally connected to the injection molding machine and internally communicates with the product molding cavity of the mold core, for injecting the injection molding liquid for product A into the product molding cavity of the mold core.

[0043] It is important to note that: (combination) Figure 2 , Figure 3 As shown, the upper mold core 310 has an inlet hole corresponding to the injection nozzle 130, and a floating sprue sleeve 410 is installed in the inlet hole. The inlet hole passes through the upper mold core 310 and connects the injection nozzle 130 and the product molding cavity. Specifically, the floating sprue sleeve 410 includes a sprue sleeve 410 and a sprue spring 420. The inlet hole is a circular hole with a stepped inner diameter. Its maximum diameter section connects to the injection nozzle 130, and its minimum diameter section connects to the product molding cavity. The axial cross-section of the sprue sleeve 410 is T-shaped and is installed in the inlet hole. The sprue spring 420 is fitted inside the sprue sleeve 410. The sprue spring 420 can lift the sprue sleeve 410, thereby forming a gap between the sprue sleeve 410 and the upper mold core 310. Air is introduced into the product molding cavity from the gap, thereby relieving the vacuum state of product A in the product molding cavity.

[0044] More detailed: such as Figure 2As shown, the guide hole has three types of through holes with different inner diameters: the largest inner diameter section, the middle section, and the smallest inner diameter section. The sprue spring 420 is located at the middle section, with one end abutting against the end face of the middle section and the other end abutting against the sprue sleeve 410. With the above structure, after the injection machine completes injection through the injection nozzle 130, the sprue sleeve 410 is lifted up by the spring. An venting groove is provided on the side of the sprue sleeve 410, which allows air to enter the product molding cavity, eliminating the technical problem of the upper mold core 310 being affected by vacuum, thus affecting the quality of product A.

[0045] In this embodiment, the venting groove of the sprue sleeve 410 is formed on the side of the sprue sleeve 410. The venting groove is connected to the gap formed between the sprue sleeve 410 and the inlet hole due to the return force of the sprue spring, so as to introduce air and thereby release the vacuum state.

[0046] like Figure 2 , Figure 5 As shown, the lower mold assembly includes a lower mold plate 210, square iron blocks 220, a base plate 230, and an ejection mechanism 240. Two square iron blocks 220 are symmetrically distributed and fixed to the base plate 230. The lower mold plate 210 is fixed to the two square iron blocks 220. The base plate 230, lower mold plate 210, and two square iron blocks 220 enclose an ejection cavity, and the ejection mechanism 240 is assembled within the ejection cavity. It should be noted that the lower mold plate 210 is equipped with an air guide sleeve 500. An air guide hole 510 is provided on one side of the air guide sleeve 500. An inlet channel is opened on the lower mold plate 210 along the inlet direction of the air guide hole 510. This inlet channel communicates with the outside of the mold to guide air into the air guide sleeve 500 through the air guide hole 510.

[0047] Specifically: the air guide sleeve 500 is made of metal, such as... Figure 5 As shown, the air guide sleeve 500 is generally in an inverted T-shape, with a through hole in its center for mounting with the ejector mechanism 240. An air guide hole 510 is provided on one side, connecting the inside and outside of the air guide sleeve 500. More specifically: the inner diameter of the air guide hole 510 decreases along the air introduction direction, comprising a small diameter section and a large diameter section. The small diameter section communicates with the through hole of the air guide sleeve 500, and its inner diameter is less than half that of the large diameter section, thereby effectively accelerating air introduction and enabling rapid breaking of the vacuum negative pressure state within the lower mold core 320.

[0048] Combination Figure 5 and Figure 6As shown, the ejection mechanism 240 includes an ejection plate assembly 241 and an ejector sleeve. The ejection plate assembly 241 is placed in the ejection cavity and is driven by an ejection cylinder to eject upwards towards the mold assembly. The ejection plate assembly 241 includes an ejection base plate and an ejection panel. The ejection base plate is positioned close to the base plate 230. The ejection cylinder passes through the base plate 230 and connects to the ejection base plate, thereby driving the ejection plate assembly 241 to move synchronously. The ejector sleeve is connected to the ejection plate assembly 241 and extends through the air guide sleeve 500 into the product forming cavity of the mold core, thereby enabling the formed product A to be ejected and demolded using the ejection displacement motion.

[0049] Specifically: Combining Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the ejector sleeve includes an ejector sleeve 242 and an inner ejector needle 243 that fit together. The inner ejector needle 243 is fixed to the base plate 230 by screws. That is, the inner ejector needle 243 is a relatively stationary component. In other words, when the top plate 110 is driven, the inner ejector needle 243 is stationary and will not perform ejection operation synchronously with the ejector plate assembly 241. The outer ejector sleeve is fitted over the inner ejector needle 243. The outer ejector sleeve is fixedly connected to the ejector plate assembly 241. The outer ejector sleeve is driven by the ejector plate assembly 241 to perform ejection displacement along the axial direction of the inner ejector needle 243.

[0050] It is important to note that: (combination) Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the outer surface of the ejector sleeve is provided with an air guide groove 244. There is at least one air guide groove 244, which is corresponding to the air guide hole 510 to which air is guided. The air guide groove 244 is a strip-shaped groove opened along the ejection displacement direction and is located close to the product molding cavity. Combined with the above structure, when the ejector sleeve is driven to eject, the displaced ejector sleeve causes the air guide groove 244 to connect with the air guide hole 510 of the air guide sleeve 500. At this time, air from outside the mold frame is introduced into the molding cavity of the lower mold core 320 through the air guide channel, air guide hole 510, and air guide groove 244 of the lower mold plate 210, thereby effectively breaking the vacuum negative pressure state of the lower mold core 320 and solving the technical problems existing in the prior art.

[0051] In this embodiment, as Figure 7 and Figure 8 As shown, there are two air guide grooves 244, which are symmetrically distributed, and one of the two air guide grooves 244 corresponds to the air guide hole 510.

[0052] Based on the above structural design and the appendix to the instruction manual Figures 2 to 8As shown, to solve the vacuum negative pressure problem existing in the prior art, the working principle of the toilet plunger injection mold is explained as follows:

[0053] First, the design of the floating sprue sleeve 410 is used to solve the problem of vacuum negative pressure in the upper mold core 310.

[0054] After the injection machine completes the injection through the injection nozzle 130, the sprue sleeve 410 is lifted up by the spring. An venting groove is provided on the side of the sprue sleeve 410. The venting groove is used to allow air to enter the product molding cavity, eliminating the technical problem that the upper mold core 310 is affected by vacuum, which affects the quality of product A.

[0055] Secondly, the vacuum negative pressure problem of the lower mold core 320 is solved by utilizing the structural design of the ejector sleeve and the air guide sleeve 500.

[0056] During the ejector sleeve displacement process, the displacement of the ejector sleeve causes the air guide groove 244 to connect with the air guide hole 510 of the air guide sleeve 500. At this time, the air outside the mold frame is introduced into the molding cavity of the lower mold core 320 through the air guide channel, air guide hole 510 and air guide groove 244 of the lower mold plate 210, thereby effectively breaking the vacuum negative pressure state of the lower mold core 320 and solving the problem of vacuum negative pressure in the lower mold core 320.

[0057] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A toilet plunger injection mold, comprising an upper mold assembly, a lower mold assembly, and a mold core, characterized in that: The upper module has a glue injection nozzle connected to the injection machine, which is connected to the product molding cavity of the mold core for introducing injection molding liquid; The upper mold core of the mold core is equipped with a sprue sleeve, and the sprue sleeve is equipped with a sprue spring; after the glue is injected, the sprue spring drives the sprue sleeve to move away from the upper mold core, and the air guide groove of the sprue sleeve introduces air to release the vacuum negative pressure state of the upper mold core. The lower mold core of the mold core is provided with an air guide sleeve, which is fitted with the ejector sleeve of the lower mold assembly. The ejector sleeve is provided with an air guide groove, which is connected to the air guide hole of the air guide sleeve. The ejector sleeve, which is displaced by ejection, introduces air through the air guide groove and the air guide hole to release the vacuum negative pressure state of the lower mold core.

2. The toilet plunger injection mold according to claim 1, characterized in that: The ejector sleeve includes an ejector sleeve and an inner ejector needle that fit together; The air guide groove is formed on the outer wall of the sleeve, and the air guide groove is correspondingly arranged with the air guide hole.

3. The toilet plunger injection mold according to claim 2, characterized in that: The two air guide slots are symmetrically distributed.

4. The toilet plunger injection mold according to claim 1, characterized in that: The air guide groove is a strip-shaped groove, and it is opened along the ejector sleeve's ejection displacement direction.

5. The toilet plunger injection mold according to claim 2, characterized in that: The lower module includes a lower template, square iron, a base plate, and an ejection mechanism, wherein: The lower template is fixedly connected to the base plate by square iron and encloses a protruding cavity; The inner needle of the ejector sleeve is connected to the base plate; The ejection mechanism includes an ejection plate assembly and the ejector sleeve. The ejection plate assembly is inserted into the ejection cavity. The outer sleeve of the ejector sleeve is connected to the ejection plate assembly and is driven by the ejection plate assembly to perform ejection displacement along the guide of the inner needle of the ejector sleeve.

6. The toilet plunger injection mold according to claim 1, characterized in that: The upper mold core is provided with an inlet hole, which connects to the injection nozzle and the product molding cavity; The sprue sleeve is inserted into the inlet hole, and the sprue spring is fitted onto the sprue sleeve; The two ends of the sprue spring abut against the inner wall of the sprue sleeve and the inlet hole, respectively.

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