Telescopic adjustable leg support injection molding mechanism of noon break desk and chair injection mold

Abstract

The utility model provides a telescopic adjustable leg support injection molding mechanism of an injection mold for noon break desks and chairs, and belongs to the technical field of molds. The mold comprises an upper mold plate and a lower mold plate, a first molding cavity used for injection molding of a leg support main body and two second molding cavities used for injection molding of leg support connecting pieces corresponding to the leg support main body are arranged between the upper mold plate and the lower mold plate, and the two second molding cavities are symmetrically arranged on the lower mold plate. An injection molding assembly is further arranged on the upper mold plate. The first forming cavity and the two symmetrical second forming cavities are formed between the upper mold plate and the lower mold plate, the injection molding assembly, the mounting groove forming assembly and the connecting hole forming assembly are matched, synchronous injection molding of a leg support body and a connecting piece in one mold is achieved, the tedious process of multi-mold switching is avoided through the design, the production efficiency is remarkably improved, and the production cost is reduced. And meanwhile, the size matching precision of the two parts is ensured through synchronous injection molding.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to an injection molding mechanism for extendable and adjustable leg supports of a lunch break desk and chair. Background Technology

[0002] The extendable and adjustable leg rests of desks and chairs used during lunch break are generally injection molded. In the production process, the extendable and adjustable leg rests need to be injection molded into two parts: the leg rest body and the leg rest connector. In the existing technology, the leg rest body and the leg rest connector need to be injection molded by two separate molds, which is costly and inefficient. Utility Model Content

[0003] The purpose of this utility model is to address the above-mentioned problems by providing a telescopic adjustable leg support injection molding mechanism for lunch break desks and chairs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A telescopic adjustable leg support injection molding mechanism for a lunch break desk and chair includes an upper mold plate and a lower mold plate. Between the upper and lower mold plates are a first molding cavity for injection molding the leg support body and two second molding cavities for injection molding leg support connectors corresponding to the leg support body. The two second molding cavities are symmetrically arranged on the lower mold plate. The upper mold plate also has an injection molding assembly. The left and right sides of the lower mold plate are symmetrically provided with mounting groove molding assemblies for molding connecting shaft mounting grooves on the leg support body and leg support connectors. The front side of the lower mold plate also has a connecting hole molding assembly for molding side connecting holes on the leg support connectors.

[0006] In the aforementioned injection molding mechanism for telescopic adjustable leg supports of lunch break desks and chairs, the mounting groove forming component includes two mounting groove forming rods that are respectively inserted into the first and second forming cavities. The lower template is also provided with a first side core-pulling component connected to the two mounting groove forming rods.

[0007] In the aforementioned injection molding mechanism for telescopic adjustable leg supports of lunch break desks and chairs, the first side core-pulling assembly includes a first core-pulling slider that is slidably disposed on the lower template, the mounting groove forming rod that is fixedly disposed at the inner end of the first core-pulling slider, and a first drive rod that is inclinedly inserted into the first core-pulling slider is also fixedly connected to the bottom of the upper template.

[0008] In the aforementioned injection molding mechanism for the telescopic adjustable leg support of the lunch break desk and chair, the outer side of the No. 1 core-pulling slider is also provided with a No. 1 limiting block fixed on the lower template, and the outer end of the No. 1 core-pulling slider is also fixedly connected with a No. 1 limiting rod that is slidably connected to the No. 1 limiting block.

[0009] In the aforementioned injection molding mechanism for the telescopic adjustable leg support of the lunch break desk and chair, the connecting hole forming assembly includes two parallel connecting hole forming rods inserted into the second forming cavity, and the lower template is also provided with a second side core-pulling assembly connected to the two connecting hole forming rods.

[0010] In the aforementioned injection molding mechanism for telescopic adjustable leg supports of lunch break desks and chairs, the second side core-pulling assembly includes a second core-pulling slider that is slidably disposed on the lower template, the connecting hole forming rod that is fixedly disposed at the inner end of the second core-pulling slider, and a second drive rod that is inclinedly inserted into the second core-pulling slider is also fixedly connected to the bottom of the upper template.

[0011] In the aforementioned injection molding mechanism for the telescopic adjustable leg support of the lunch break desk and chair, a second limiting block is fixed on the lower template on the outer side of the second core-pulling slider, and a second limiting rod is fixedly connected to the outer end of the second core-pulling slider and slidably connected to the second limiting block.

[0012] In the aforementioned injection molding mechanism for telescopic adjustable leg supports of lunch break desks and chairs, the injection component includes an injection tube vertically arranged on the upper template and located between the first molding cavity and the second molding cavity. The lower template is provided with a connecting flow channel connecting the bottom end of the injection tube to the first molding cavity and the second molding cavity.

[0013] In the aforementioned injection molding mechanism for telescopic adjustable leg supports of lunch break desks and chairs, a top plate is provided on the lower side of the lower template. Several straight push rods connected to the first molding cavity and several straight push rods connected to the second molding cavity are vertically arranged on the top plate.

[0014] In the aforementioned injection molding mechanism for the telescopic adjustable leg support of the lunch break desk and chair, the top plate is also vertically provided with several residual material ejector rods connected to the connecting flow channel.

[0015] Compared with existing technologies, the advantages of this utility model are:

[0016] 1. By setting a No. 1 molding cavity and two symmetrical No. 2 molding cavities between the upper and lower mold plates, and in conjunction with the injection molding components, mounting groove molding components and connecting hole molding components, the leg support body and the connecting parts are simultaneously injection molded in one mold. This design avoids the cumbersome process of switching between multiple molds, significantly improves production efficiency, reduces mold manufacturing costs, and ensures the dimensional matching accuracy of the two parts through synchronous injection molding.

[0017] 2. The mounting slot forming assembly uses two mounting slot forming rods inserted into the No. 1 forming cavity and the No. 2 forming cavity respectively, and is driven by the No. 1 side core pulling assembly. This design can simultaneously form the connecting shaft mounting slot on the leg support body and the connector, realizing the automated forming of the side hole structure. Compared with traditional manual processing or additional processes, this structure reduces post-processing steps, shortens the production cycle, and at the same time ensures the positional accuracy of the mounting slot, improving the assembly stability of the leg support assembly.

[0018] 3. The connecting hole forming assembly is inserted into the second forming cavity through two parallel connecting hole forming rods and driven by the second side core pulling assembly. It can simultaneously form side connecting holes on the leg support connector. This structure works in conjunction with the mounting groove forming assembly to achieve one-time forming of multi-directional holes in the leg support connector. This avoids hole position deviations caused by traditional multi-process processing, improves the assembly accuracy of the connector and other components, and reduces mold complexity and processing costs.

[0019] 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

[0020] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0021] Figure 2 This is a partial structural schematic diagram of the present invention;

[0022] Figure 3 This is a structural diagram of the lower template;

[0023] Figure 4 This is a partial structural diagram of the lower template.

[0024] In the diagram, the components are: upper template 1, lower template 2, molding cavity 1 3, molding cavity 2 4, mounting groove molding assembly 5, connecting hole molding assembly 6, mounting groove molding rod 7, core-pulling slider 1 8, drive rod 1 9, limit block 10, limit rod 11, connecting hole molding rod 12, core-pulling slider 2 13, drive rod 2 14, limit block 2 15, limit rod 2 16, injection tube 17, connecting flow channel 18, top plate 19, straight ejector rod 10, straight ejector rod 21, and residual material ejector rod 22. Detailed Implementation

[0025] like Figures 1-4A retractable and adjustable leg support injection molding mechanism for a lunch break desk and chair includes an upper template 1 and a lower template 2. Between the upper template 1 and the lower template 2, there is a first molding cavity 3 for injection molding the leg support body and two second molding cavities 4 for injection molding leg support connectors corresponding to the leg support body. The two second molding cavities 4 are symmetrically arranged on the lower template 2. The upper template 1 is also equipped with an injection molding assembly. On the left and right sides of the lower template 2, there are symmetrically arranged mounting groove molding assemblies 5 for molding connecting shaft mounting grooves on the leg support body and leg support connectors. The front side of the lower template 2 is also equipped with a connecting hole molding assembly 6 for molding side connecting holes on the leg support connectors.

[0026] In this invention, by setting a first molding cavity 3 and two symmetrical second molding cavities 4 between the upper mold plate 1 and the lower mold plate 2, and cooperating with the injection molding assembly, the mounting groove molding assembly 5 and the connecting hole molding assembly 6, the leg support body and the connecting parts are synchronously injection molded in one mold. This design avoids the cumbersome process of switching between multiple molds, significantly improves production efficiency, reduces mold manufacturing costs, and ensures the dimensional matching accuracy of the two parts through synchronous injection molding.

[0027] Specifically, the mounting groove forming assembly 5 includes two mounting groove forming rods 7 that are respectively inserted into the first forming cavity 3 and the second forming cavity 4. The lower template 2 is also provided with a first side core-pulling assembly connected to the two mounting groove forming rods 7. The mounting groove forming assembly 5 uses two mounting groove forming rods 7 that are respectively inserted into the first forming cavity 3 and the second forming cavity 4 and driven by the first side core-pulling assembly. This design can simultaneously form the connecting shaft mounting groove on the leg support body and the connector, realizing the automated forming of the side hole structure. Compared with traditional manual processing or additional processes, this structure reduces post-processing steps, shortens the production cycle, and ensures the positional accuracy of the mounting groove, thereby improving the assembly stability of the leg support assembly.

[0028] Specifically, the first side core-pulling assembly includes a first core-pulling slider 8 slidably mounted on the lower template 2, and the mounting groove forming rod 7 fixedly mounted inside the first core-pulling slider 8. The bottom of the upper template 1 is also fixedly connected to a first drive rod 9 inclined and inserted into the first core-pulling slider 8. The first side core-pulling assembly utilizes the cooperation between the first core-pulling slider 8 and the inclined first drive rod 9. When the upper template 1 descends to close the mold, the drive rod pushes the slider inward through the inclined surface, allowing the mounting groove forming rod 7 to accurately enter the forming position. When the mold opens, the drive rod is pulled out, and the slider automatically retracts. This design utilizes the mold opening and closing action to achieve automatic drive of the core-pulling mechanism, eliminating the need for an additional power source, simplifying the mold structure, reducing energy consumption, and ensuring the synchronization and stability of the core-pulling action through mechanical linkage, avoiding human error.

[0029] Specifically, the outer side of the first core-pulling slider 8 is also provided with a first limiting block 10 fixed on the lower template 2, and the outer end of the first core-pulling slider 8 is also fixedly connected to a first limiting rod 11 that is slidably connected to the first limiting block 10. The limiting structure formed by the first limiting block 10 and the first limiting rod 11 restricts the movement range of the first core-pulling slider 8, ensuring the positional accuracy of the mounting groove forming rod 7 during the core-pulling process. This design avoids the molding size deviation caused by the slider shifting due to inertia or external force. Especially in high-speed injection molding cycles, it effectively improves the molding consistency of the mounting groove, reduces the scrap rate, and extends the service life of the mold.

[0030] Specifically, the connecting hole forming assembly 6 includes two parallel connecting hole forming rods 12 inserted into the second forming cavity 4. The lower template 2 is also provided with a second side core-pulling assembly connected to the two connecting hole forming rods 12. The connecting hole forming assembly 6 is inserted into the second forming cavity 4 through the two parallel connecting hole forming rods 12 and is driven by the second side core-pulling assembly. It can simultaneously form side connecting holes on the leg support connector. This structure works in conjunction with the mounting groove forming assembly 5 to achieve one-time forming of multi-directional holes on the leg support connector, avoiding hole position deviations caused by traditional multi-process processing, improving the assembly accuracy of the connector and other components, and reducing mold complexity and processing costs.

[0031] Specifically, the second side core-pulling assembly includes a second core-pulling slider 13 slidably mounted on the lower template 2. The connecting hole forming rod 12 is fixed to the inner end of the second core-pulling slider 13. The bottom of the upper template 1 is also fixedly connected to a second driving rod 14 that is inclined and inserted into the second core-pulling slider 13. The second side core-pulling assembly uses the second core-pulling slider 13 in conjunction with the inclined second driving rod 14. Its working principle is the same as that of the first side core-pulling assembly. The core is automatically driven by the mold opening and closing action. This design ensures the high efficiency and stability of the side connecting hole forming process. At the same time, it is independent of and coordinated with the core-pulling action of the mounting groove, so that the mold can complete the forming of complex structures in multiple parts in one injection cycle, further improving production efficiency and product quality.

[0032] Specifically, the outer side of the second core-pulling slider 13 is also provided with a second limiting block 15 fixed on the lower template 2, and the outer end of the second core-pulling slider 13 is also fixedly connected to a second limiting rod 16 that is slidably connected to the second limiting block 15. The limiting structure formed by the second limiting block 15 and the second limiting rod 16 restricts the movement range of the second core-pulling slider 13, ensuring the core-pulling accuracy of the connecting hole forming rod 12. This design works together with the first limiting structure to ensure that the mold can maintain the repeatability of the core-pulling position after multiple mold opening and closing cycles, effectively avoiding hole deformation or dimensional deviation caused by core-pulling deviation, and improving the consistency and reliability of the product.

[0033] Specifically, the injection molding assembly includes an injection tube 17 vertically mounted on the upper mold plate 1 and located between the first molding cavity 3 and the second molding cavity 4. The lower mold plate 2 is provided with a connecting flow channel 18 connecting the bottom end of the injection tube 17 to the first molding cavity 3 and the second molding cavity 4. The injection molding assembly utilizes the injection tube 17 located between the first molding cavity 3 and the second molding cavity 4, in conjunction with the connecting flow channel 18 within the lower mold plate 2, to allow molten plastic to be injected synchronously into each molding cavity from the center. This design shortens the melt flow path, reduces pressure loss, ensures uniform filling of each cavity with plastic, reduces defects such as shrinkage marks and porosity caused by uneven flow, and improves the product's appearance quality and internal performance. Simultaneously, the center-feed method simplifies the flow channel design, reduces waste generation, and lowers material costs.

[0034] Specifically, a top plate 19 is also provided on the lower side of the lower mold plate 2. Several first-stage ejector rods 20 connected to the first molding cavity 3 and several second-stage ejector rods 21 connected to the second molding cavity 4 are vertically arranged on the top plate 19. Several residual material ejector rods 22 connected to the connecting flow channel 18 are also vertically arranged on the top plate 19. The first-stage ejector rods 20 and second-stage ejector rods 21 on the top plate 19 correspond to the first molding cavity 3 and the second molding cavity 4, respectively, and simultaneously eject the leg support body and connecting parts when the mold opens. This design ensures smooth demolding of molded parts, avoiding deformation or damage caused by uneven ejection force. It is especially suitable for thin-walled, complex-structured leg support components. At the same time, the ejection mechanism and the core-pulling mechanism work together to realize a fully automated process of injection molding, core pulling, and demolding, further improving production efficiency. The residual material ejector pin 22 is connected to the connecting runner 18, and simultaneously ejects the residual molten material in the runner during demolding. This design avoids residual material sticking to the mold in the runner, reduces manual cleaning procedures, and shortens the production cycle. In addition, the residual material can be recycled and reused after ejection, improving material utilization and reducing production costs. Furthermore, timely cleaning of the runner can prevent residual material from solidifying and clogging the runner, ensuring smooth flow of molten material during the next injection, improving production stability and product quality.

[0035] The working principle of this utility model is as follows: by setting a first molding cavity 3 and two symmetrical second molding cavities 4 between the upper mold plate 1 and the lower mold plate 2, and cooperating with the injection molding assembly, the mounting groove molding assembly 5 and the connecting hole molding assembly 6, the leg support body and the connecting parts are synchronously injection molded in one mold. This design avoids the cumbersome process of switching between multiple molds, significantly improves production efficiency, reduces mold manufacturing costs, and ensures the dimensional matching accuracy of the two parts through synchronous injection molding.

[0036] The mounting slot forming assembly 5 uses two mounting slot forming rods 7, which are respectively inserted into the first forming cavity 3 and the second forming cavity 4, and are driven by the first side core-pulling assembly. This design can simultaneously form the connecting shaft mounting slot on the leg support body and the connector, realizing the automated forming of the side hole structure. Compared with traditional manual processing or additional processes, this structure reduces post-processing steps, shortens the production cycle, and ensures the positional accuracy of the mounting slot, improving the assembly stability of the leg support assembly. The first side core-pulling assembly uses a first core-pulling slider 8 in cooperation with an inclined first drive rod 9. When the upper template 1 descends and closes the mold, the drive rod pushes the slider inward through the inclined surface, so that the mounting slot forming rod 7 accurately enters the forming position. When the mold opens, the drive rod is pulled out and the slider automatically retracts. This design utilizes the mold opening and closing action to realize the automatic drive of the core pulling mechanism, eliminating the need for an additional power source, simplifying the mold structure, and reducing energy consumption. At the same time, the mechanical linkage ensures the synchronization and stability of the core pulling action, avoiding human operation errors. The limiting structure formed by the first limiting block 10 and the first limiting rod 11 restricts the movement range of the first core pulling slider 8, ensuring the positional accuracy of the mounting groove forming rod 7 during the core pulling process. This design avoids the molding size deviation caused by the slider shifting due to inertia or external force. Especially in high-speed injection molding cycles, it effectively improves the molding consistency of the mounting groove, reduces the scrap rate, and extends the mold service life.

[0037] The connecting hole forming assembly 6 is inserted into the second forming cavity 4 through two parallel connecting hole forming rods 12 and is driven by the second side core-pulling assembly. It can simultaneously form side connecting holes on the leg support connector. This structure works in conjunction with the mounting groove forming assembly 5 to achieve one-time forming of multi-directional holes on the leg support connector, avoiding hole position deviations caused by traditional multi-process machining, improving the assembly accuracy of the connector and other components, and reducing mold complexity and processing costs. The second side core-pulling assembly uses a second core-pulling slider 13 in conjunction with an inclined second drive rod 14. Its working principle is the same as the first side core-pulling assembly, automatically driving the core-pulling through mold opening and closing. The design ensures the high efficiency and stability of the side connecting hole forming process. At the same time, it is independent of and coordinated with the core pulling action of the mounting groove, enabling the mold to complete the forming of complex structures of multiple parts in one injection cycle, further improving production efficiency and product quality. The limiting structure formed by the second limiting block 15 and the second limiting rod 16 restricts the movement range of the second core pulling slider 13, ensuring the core pulling accuracy of the connecting hole forming rod 12. This design works together with the first limiting structure to ensure that the mold can maintain the repeatability of the core pulling position after multiple mold opening and closing cycles, effectively avoiding hole deformation or dimensional deviation caused by core pulling deviation, and improving the consistency and reliability of the product.

[0038] 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.

[0039] Although this article frequently uses terms such as upper template 1, lower template 2, first molding cavity 3, second molding cavity 4, mounting groove molding assembly 5, connecting hole molding assembly 6, mounting groove molding rod 7, first core-pulling slider 8, first driving rod 9, first limiting block 10, first limiting rod 11, connecting hole molding rod 12, second core-pulling slider 13, second driving rod 14, second limiting block 15, second limiting rod 16, injection tube 17, connecting flow channel 18, top plate 19, first straight ejector rod 20, second straight ejector rod 21, and excess material ejector rod 22, these terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. A telescopic adjustable leg support injection molding mechanism for a lunch break desk and chair, comprising an upper mold plate (1) and a lower mold plate (2), characterized in that, Between the upper template (1) and the lower template (2), there is a first molding cavity (3) for injection molding the leg support body and two second molding cavities (4) for injection molding the leg support connector corresponding to the leg support body. The two second molding cavities (4) are symmetrically arranged on the lower template (2). The upper template (1) is also provided with an injection molding assembly. The left and right sides of the lower template (2) are also symmetrically provided with mounting groove molding assemblies (5) for molding the connecting shaft mounting groove on the leg support body and the leg support connector. The front side of the lower template (2) is also provided with a connecting hole molding assembly (6) for molding the side connecting hole on the leg support connector.

2. The telescopic adjustable leg support injection molding mechanism for the lunch break desk and chair injection mold according to claim 1, characterized in that, The mounting groove forming assembly (5) includes two mounting groove forming rods (7) that are respectively inserted into the first forming cavity (3) and the second forming cavity (4). The lower template (2) is also provided with a first side core-pulling assembly connected to the two mounting groove forming rods (7).

3. The telescopic adjustable leg support injection molding mechanism for the lunch break desk and chair injection mold according to claim 2, characterized in that, The first side core-pulling assembly includes a first core-pulling slider (8) slidably disposed on the lower template (2), the mounting groove forming rod (7) is fixedly disposed at the inner end of the first core-pulling slider (8), and the bottom of the upper template (1) is also fixedly connected to a first driving rod (9) that is inclinedly inserted into the first core-pulling slider (8).

4. The telescopic adjustable leg support injection molding mechanism for the lunch break desk and chair injection mold according to claim 3, characterized in that, The first core-pulling slider (8) is also provided with a first limiting block (10) fixed on the lower template (2) on the outside, and the first limiting rod (11) which is slidably connected to the first limiting block (10) is also fixed at the outer end of the first core-pulling slider (8).

5. The telescopic adjustable leg support injection molding mechanism for the lunch break desk and chair injection mold according to claim 2, characterized in that, The connecting hole forming assembly (6) includes two connecting hole forming rods (12) inserted parallel to each other into the second forming cavity (4). The lower template (2) is also provided with a second side core-pulling assembly connected to the two connecting hole forming rods (12).

6. The telescopic adjustable leg support injection molding mechanism for the lunch break desk and chair injection mold according to claim 5, characterized in that, The second side core-pulling assembly includes a second core-pulling slider (13) that is slidably disposed on the lower template (2), the connecting hole forming rod (12) is fixedly disposed at the inner end of the second core-pulling slider (13), and the bottom of the upper template (1) is also fixedly connected to a second drive rod (14) that is inclinedly inserted into the second core-pulling slider (13).

7. The telescopic adjustable leg support injection molding mechanism for the lunch break desk and chair injection mold according to claim 6, characterized in that, The outer side of the second core-pulling slider (13) is also provided with a second limiting block (15) fixed on the lower template (2), and the outer end of the second core-pulling slider (13) is also fixed with a second limiting rod (16) that is slidably connected to the second limiting block (15).

8. The telescopic adjustable leg support injection molding mechanism for the lunch break desk and chair injection mold according to claim 1, characterized in that, The injection molding assembly includes an injection tube (17) vertically arranged on the upper template (1) and located between the first molding cavity (3) and the second molding cavity (4). The lower template (2) is provided with a connecting channel (18) connecting the bottom end of the injection tube (17) to the first molding cavity (3) and the second molding cavity (4).

9. The telescopic adjustable leg support injection molding mechanism for the lunch break desk and chair injection mold according to claim 8, characterized in that, The lower template (2) is also provided with a top plate (19) on the lower side. The top plate (19) is provided with several first straight push rods (20) connected to the first forming cavity (3) and several second straight push rods (21) connected to the second forming cavity (4).

10. The telescopic adjustable leg support injection molding mechanism for the lunch break desk and chair injection mold according to claim 9, characterized in that, The top plate (19) is also vertically provided with several residual material push rods (22) connected to the connecting flow channel (18).

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