Injection mold for indoor fire-fighting spray pipe fitting

Abstract

This utility model provides an injection mold for indoor fire sprinkler pipe fittings, belonging to the field of mold technology. It includes, from top to bottom, a top plate, an upper mold mounting plate, an upper template, a combined lower mold structure, and a base. Two pipe fitting forming mechanisms are arranged between the upper template and the combined lower mold structure. By setting up the combined lower mold structure, the lower template is movably assembled onto the lower mold mounting plate, and an ejector plate and a lifting assembly are set on the lower side of the lower template. The lifting assembly drives the entire lower template to rise and fall to achieve ejection. This design changes the traditional single ejector rod ejection method, transmitting the ejection force through the larger contact area between the lower template and the product, avoiding excessive local stress that could damage the product. Simultaneously, the dual pipe fitting forming mechanism improves production efficiency, and the combined structure provides convenience for subsequent maintenance and adjustment.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to an injection mold for indoor fire sprinkler pipe fittings. Background Technology

[0002] Indoor fire sprinkler pipe fittings, as key components of fire protection systems, have strict requirements for molding precision, structural integrity, and appearance quality, and their production largely relies on injection molding processes. In existing technologies, the ejection mechanism design of indoor fire sprinkler pipe fitting molds has significant flaws: traditional ejection methods often use a single or a small number of ejector rods to directly act on the product surface. Due to the extremely small contact area between the ejector rod and the product, the localized force exerted by the ejector rod on the product during ejection is highly concentrated. This design is prone to multiple problems: Firstly, the localized high pressure during ejection can easily cause indentations and dents on the product surface, and even cracks and deformations in thin-walled sections of the pipe fittings, directly affecting the product qualification rate. This is especially true for spray pipe fittings with complex structures (such as those with threads or interfaces) or brittle materials, where the risk of damage is even higher. Secondly, reducing the ejection force to minimize damage can lead to poor demolding, causing the product to stick to the mold and requiring manual demolding. This not only increases working hours and reduces production efficiency but may also further scratch or deform the product during manual operation. Furthermore, the structural limitations of traditional ejection mechanisms make mold adjustments difficult and maintenance costs high when adapting to the production of spray pipe fittings of different specifications, making it difficult to meet the dual demands of efficiency and quality in mass production.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, Chinese patent discloses a trimming mechanism for spray pipe products [application number: 202122003708.0], which includes a frame. The frame is provided with telescopic component No. 1 and telescopic component No. 2, and the telescopic ends of telescopic component No. 1 and telescopic component No. 2 are provided with trimming mold No. 1. The frame is also provided with a telescopic component No. 4 laterally, and the telescopic end of telescopic component No. 4 is provided with trimming mold No. 2. The frame is provided with a telescopic component No. 5 obliquely, and the telescopic end of telescopic component No. 5 is provided with trimming mold No. 3. Summary of the Invention

[0004] The purpose of this utility model is to address the above-mentioned problems by providing an injection mold for indoor fire sprinkler pipe fittings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An injection mold for indoor fire sprinkler pipe fittings includes, from top to bottom, a top plate, an upper mold mounting plate, an upper template, a combined lower mold structure, and a base. Two pipe fitting forming mechanisms are provided between the upper template and the combined lower mold structure. The combined lower mold structure includes a lower template, a lower mold mounting plate, and a lower mold base plate. The lower mold mounting plate is fixed to the lower mold base plate. The lower template is movably mounted on the lower mold mounting plate. An ejector plate is also provided on the lower side of the lower template. A lifting component capable of driving the lower template to rise and fall is provided on the ejector plate.

[0006] In the aforementioned injection mold for indoor fire sprinkler pipe fittings, the pipe fitting forming mechanism includes an upper core disposed on an upper template and a lower core disposed on a lower template. The inner ends of the lower core and the upper core abut against each other, and the upper template, the upper core, the lower core, and the lower template are combined to form a forming cavity.

[0007] In the aforementioned injection mold for indoor fire sprinkler pipe fittings, the top end of the upper core is fixed to the upper mold mounting plate, and the bottom end of the lower core is fixed to the lower mold mounting plate.

[0008] In the aforementioned injection mold for indoor fire sprinkler pipe fittings, the lifting assembly includes a straight push rod vertically mounted on the ejector plate, the top end of which is detachably fixed to the lower template by screws.

[0009] In the aforementioned injection mold for indoor fire sprinkler pipe fittings, an annular insert is also embedded on the lower template, and the inner ring of the annular insert and the lower core are sealed together.

[0010] In the aforementioned injection mold for indoor fire sprinkler pipe fittings, a lower limit guide post structure is also provided on the bottom plate of the lower mold.

[0011] In the aforementioned injection mold for indoor fire sprinkler pipe fittings, the lower limit guide post structure includes a lower guide post that is vertically fixed on the bottom plate of the lower mold. The top of the lower guide post vertically penetrates the lower mold mounting plate and the lower template and is slidably connected to the lower template.

[0012] In the aforementioned injection mold for indoor fire sprinkler pipe fittings, the top of the lower guide column is inserted into the upper template.

[0013] In the aforementioned injection mold for indoor fire sprinkler pipe fittings, an upper cooling channel is provided inside the upper core.

[0014] In the aforementioned injection mold for indoor fire sprinkler pipe fittings, a lower cooling channel is provided inside the lower core.

[0015] Compared with existing technologies, the advantages of this utility model are: 1. By setting up a combined lower mold structure, the lower mold plate is movably assembled onto the lower mold mounting plate, and an ejector plate and lifting assembly are set on the lower side of the lower mold plate. The lifting assembly drives the entire lower mold plate to rise and fall to achieve ejection. This design changes the traditional single ejector rod ejection method, and transmits the ejection force through the larger contact area between the lower mold plate and the product, avoiding excessive local stress that could damage the product. At the same time, the dual-pipe forming mechanism can improve production efficiency, and the combined structure also provides convenience for subsequent maintenance and adjustment.

[0016] 2. The pipe fitting forming mechanism adopts a design where the inner ends of the upper and lower cores abut against each other, forming a complete forming cavity with the upper and lower templates. This structure allows the molten raw material to be precisely formed within the forming cavity, ensuring the shape and dimensional accuracy of the fire sprinkler pipe fittings and avoiding product defects caused by irregularities in the forming cavity. Simultaneously, the coordinated operation of the core and template provides a foundation for uniform stress on the product during subsequent ejection, further reducing the probability of product damage during ejection and ensuring the stability of the formed product quality.

[0017] 3. The lifting assembly adopts a design where the top of the straight ejector rod is detachably fixed to the lower mold plate with screws, achieving stable transmission of ejection power. The rigid connection between the straight ejector rod and the lower mold plate ensures that the lower mold plate is subjected to uniform force during ejection, avoiding uneven force on the product caused by tilting of the lower mold plate and damage. The detachable connection method facilitates the replacement and maintenance of the ejector rod. When the ejector rod is worn, it can be replaced without disassembling the entire mold, shortening maintenance time, reducing maintenance costs, and ensuring a long-term stable ejection effect of the ejection mechanism.

[0018] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a cross-sectional view of the present invention from another direction; Figure 3 This is a structural diagram of the combined lower mold structure; Figure 4 This is a top view of the combined lower mold structure. Detailed Implementation

[0020] like Figures 1-4As shown, an injection mold for an indoor fire sprinkler pipe fitting includes, from top to bottom, a top plate 1, an upper mold mounting plate 2, an upper template 3, a combined lower mold structure 4, and a base 5. Two pipe fitting forming mechanisms 6 are provided between the upper template 3 and the combined lower mold structure 4. The combined lower mold structure 4 includes a lower template 7, a lower mold mounting plate 8, and a lower mold base plate 9. The lower mold mounting plate 8 is fixed on the lower mold base plate 9. The lower template 7 is movably mounted on the lower mold mounting plate 8. An ejector plate 10 is also provided on the lower side of the lower template 7. A lifting assembly 11 that can drive the lower template 7 to rise and fall is provided on the ejector plate 10.

[0021] In this invention, a combined lower mold structure is used, in which the lower mold plate is movably assembled onto the lower mold mounting plate. An ejector plate and a lifting assembly are installed on the lower side of the lower mold plate, and the lifting assembly drives the entire lower mold plate to rise and fall, achieving ejection. This design changes the traditional single ejector rod method, transmitting ejection force through a larger contact area between the lower mold plate and the product, avoiding excessive localized stress that could damage the product. Simultaneously, the dual-pipe forming mechanism improves production efficiency, and the combined structure facilitates subsequent maintenance and adjustments.

[0022] Specifically, the pipe fitting forming mechanism 6 includes an upper core 12 mounted on the upper template 3 and a lower core 13 mounted on the lower template 7. The inner ends of the lower core 13 and the upper core 12 abut against each other. The upper template 3, upper core 12, lower core 13, and lower template 7 are combined to form a forming cavity 14. The pipe fitting forming mechanism employs a design where the inner ends of the upper and lower cores abut against each other, forming a complete forming cavity with the upper and lower templates. This structure allows the molten raw material to be precisely formed within the forming cavity, ensuring the shape and dimensional accuracy of the fire sprinkler pipe fittings and avoiding product defects caused by irregularities in the forming cavity. Simultaneously, the coordinated cooperation between the core and the template provides a foundation for uniform stress on the product during subsequent ejection, further reducing the probability of product damage during ejection and ensuring the stability of the formed product quality.

[0023] Specifically, the top end of the upper core 12 is fixed to the upper mold mounting plate 2, and the bottom end of the lower core 13 is fixed to the lower mold mounting plate 8. This design, where the top end of the upper core is fixed to the upper mold mounting plate and the bottom end of the lower core is fixed to the lower mold mounting plate, ensures the core remains in a stable position during mold opening and closing and molding processes. This prevents core displacement that could lead to deformation of the molding cavity, ensuring product consistency with each injection molding. The fixed mounting method also enhances the core's load-bearing capacity, enabling it to withstand the pressure during injection molding, reducing the risk of core damage, extending mold life, and providing structural support for the stable operation of subsequent cooling and ejection processes.

[0024] Specifically, the lifting assembly 11 includes a straight push rod 15 vertically mounted on the ejector plate 10, the top end of which is detachably fixed to the lower template 7 by screws. The design of the straight push rod being detachably fixed to the lower template by screws ensures stable transmission of ejection power. The rigid connection between the straight push rod and the lower template ensures uniform force distribution on the lower template during ejection, preventing uneven force distribution on the product due to template tilting and subsequent damage. The detachable connection facilitates the replacement and maintenance of the push rod. When the push rod wears out, it can be replaced without disassembling the entire mold, shortening maintenance time, reducing maintenance costs, and ensuring a long-term stable ejection effect.

[0025] Specifically, the lower mold plate 7 is also fitted with an annular insert 16, the inner ring of which is sealed to the lower core 13. This design, with the annular insert embedded in the lower mold plate and its inner ring sealed to the lower core, serves two purposes: firstly, it enhances the local structural strength of the lower mold plate, preventing wear and deformation at the connection between the lower mold plate and the core after long-term use; secondly, the sealed connection prevents molten material from overflowing from the gap between the core and the mold plate during injection molding, avoiding product defects such as flash and ensuring product appearance quality. Furthermore, the insert structure facilitates the replacement of suitable inserts for different product specifications, improving mold versatility.

[0026] Specifically, the lower mold base plate 9 is also equipped with a lower limit guide post structure. The lower limit guide post structure on the lower mold base plate provides guidance for the lifting and lowering movement of the lower mold plate, preventing the lower mold plate from deviating or tilting during the lifting or lowering process, and ensuring that the lower mold plate always moves along the preset trajectory. This design makes the product more evenly stressed during the ejection process, further reducing the probability of product damage. At the same time, the limiting function can prevent the lower mold plate from excessively lifting and lowering, which may cause collision damage to mold components, protect the overall mold structure, and extend the equipment operating cycle.

[0027] Specifically, the lower limit guide post structure includes a lower guide post 17 vertically fixed on the lower mold base plate 9. The top end of the lower guide post 17 vertically penetrates the lower mold mounting plate 8 and the lower template 7 and is slidably connected to the lower template 7. The lower limit guide post structure, with its design of the top end of the lower guide post penetrating the lower mold mounting plate and slidingly connecting to the lower template, enhances guiding accuracy, making the movement of the lower template more stable during lifting and lowering, avoiding wobbling of the lower template due to insufficient guidance. The through-type structure also enhances the connection stability between the guide post and various mold components, improves the overall structural rigidity of the mold, can withstand larger forces during injection and ejection, reduces the risk of mold deformation, and ensures product molding accuracy and ejection reliability.

[0028] Specifically, the top of the lower guide pillar 17 is inserted into the upper mold plate 3. This design, where the top of the lower guide pillar is inserted into the upper mold plate, ensures more precise positioning of the upper and lower mold plates during mold closing, guaranteeing accurate alignment of the upper and lower cores to form a complete molding cavity. This prevents core collision damage or cavity deviation due to misalignment during mold closing. Simultaneously, the structure of the guide pillar penetrating the lower mold plate and inserting into the upper mold plate further enhances the overall connection stability of the mold, allowing it to withstand greater clamping force during mold closing, reducing mold deformation, ensuring stable injection molding, and improving product quality consistency.

[0029] Specifically, the upper core 12 is equipped with an upper cooling channel 18, and the lower core 13 is equipped with a lower cooling channel 19. This design, with upper and lower cooling channels in the upper and lower cores, quickly removes heat from the product within the molding cavity after injection molding, accelerating product cooling and solidification, shortening the molding cycle, and improving production efficiency. Simultaneously, uniform cooling prevents internal stress caused by uneven cooling, reducing defects such as cracking and deformation, and ensuring the product's structural strength and dimensional accuracy. This is particularly suitable for products with high structural stability requirements, such as fire sprinkler pipe fittings, ensuring that the product meets performance requirements. The working principle of this utility model is as follows: By setting a combined lower mold structure, the lower mold plate is movably assembled onto the lower mold mounting plate, and an ejector plate and a lifting component are set on the lower side of the lower mold plate. The lifting component drives the lower mold plate to rise and fall as a whole to achieve ejection. This design changes the traditional single ejector rod ejection method, and transmits the ejection force through the larger contact area between the lower mold plate and the product, avoiding excessive local stress that could damage the product. At the same time, the dual-pipe forming mechanism can improve production efficiency, and the combined structure also provides convenience for subsequent maintenance and adjustment. The pipe forming mechanism adopts a design where the inner ends of the upper and lower cores abut against each other, forming a complete forming cavity with the upper and lower templates. This structure allows the molten raw material to be precisely formed within the forming cavity, ensuring the shape and dimensional accuracy of the fire sprinkler pipe fittings and avoiding product defects caused by irregularities in the forming cavity. Simultaneously, the coordinated operation of the core and template provides a foundation for uniform force distribution during subsequent ejection, further reducing the probability of product damage during ejection and ensuring the stability of the formed product quality. The lifting component uses a straight ejector rod with its top end detachably fixed to the lower template via screws, achieving stable transmission of ejection power. The rigid connection between the straight ejector rod and the lower template ensures uniform force distribution on the lower template during ejection, preventing uneven force distribution and damage caused by template tilting. The detachable connection facilitates the replacement and maintenance of the ejector rod. When the ejector rod wears, it can be replaced without disassembling the entire mold, shortening maintenance time, reducing maintenance costs, and ensuring a long-term stable ejection effect. The design of the lower mold plate with an embedded annular insert and a sealed connection between the inner ring and the lower core serves two purposes. First, the annular insert enhances the local structural strength of the lower mold plate, preventing wear and deformation at the connection between the lower mold plate and the core after long-term use. Second, the sealed connection prevents molten material from overflowing from the gap between the core and the mold plate during injection molding, avoiding product defects such as flash and ensuring product appearance quality. Simultaneously, the insert structure facilitates the replacement of compatible inserts for different product specifications, improving mold versatility. A lower limit guide post structure is set on the lower mold base plate to guide the lifting and lowering movement of the lower mold plate, preventing deviation or tilting during lifting or lowering, ensuring that the lower mold plate always moves along the preset trajectory. This design makes the product more evenly stressed during ejection, further reducing the probability of product damage. At the same time, the limit function prevents excessive lifting and lowering of the lower mold plate from causing collision damage to mold components, protecting the overall mold structure and extending the equipment's operating cycle.

[0030] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An injection mold for indoor fire sprinkler pipe fittings, comprising, from top to bottom, a top plate (1), an upper mold mounting plate (2), an upper template (3), a combined lower mold structure (4), and a base (5), characterized in that, Two pipe forming mechanisms (6) are provided between the upper template (3) and the combined lower mold structure (4). The combined lower mold structure (4) includes a lower template (7), a lower mold mounting plate (8) and a lower mold base plate (9). The lower mold mounting plate (8) is fixed on the lower mold base plate (9). The lower template (7) is movably mounted on the lower mold mounting plate (8). An ejector plate (10) is also provided on the lower side of the lower template (7). A lifting component (11) that can drive the lower template (7) to rise and fall is provided on the ejector plate (10).

2. The injection mold for indoor fire sprinkler pipe fittings according to claim 1, characterized in that, The pipe forming mechanism (6) includes an upper core (12) set on the upper template (3) and a lower core (13) set on the lower template (7). The inner ends of the lower core (13) and the upper core (12) abut against each other. The upper template (3), the upper core (12), the lower core (13) and the lower template (7) are combined to form a forming cavity (14).

3. The injection mold for indoor fire sprinkler pipe fittings according to claim 2, characterized in that, The top end of the upper core (12) is fixed on the upper mold mounting plate (2), and the bottom end of the lower core (13) is fixed on the lower mold mounting plate (8).

4. The injection mold for indoor fire sprinkler pipe fittings according to claim 3, characterized in that, The lifting assembly (11) includes a straight push rod (15) vertically mounted on the ejector plate (10), the top end of which is detachably fixed to the lower template (7) by screws.

5. The injection mold for indoor fire sprinkler pipe fittings according to claim 4, characterized in that, The lower template (7) is also fitted with an annular insert (16), and the inner ring of the annular insert (16) and the lower core (13) are sealed together.

6. The injection mold for indoor fire sprinkler pipe fittings according to claim 5, characterized in that, The lower mold base plate (9) is also provided with a lower limit guide post structure.

7. The injection mold for indoor fire sprinkler pipe fittings according to claim 6, characterized in that, The lower limit guide post structure includes a lower guide post (17) that is vertically fixed on the lower mold base plate (9). The top of the lower guide post (17) vertically penetrates the lower mold mounting plate (8) and the lower template (7) and is slidably connected to the lower template (7).

8. The injection mold for indoor fire sprinkler pipe fittings according to claim 7, characterized in that, The top of the lower guide post (17) is inserted into the upper template (3).

9. The injection mold for indoor fire sprinkler pipe fittings according to claim 8, characterized in that, The upper core (12) is provided with an upper cooling channel (18).

10. The injection mold for indoor fire sprinkler pipe fittings according to claim 9, characterized in that, The lower core (13) is provided with a lower cooling channel (19).

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