Injection mold with front mold screen cloth positioning function

Abstract

The utility model discloses an injection mold with a front mold screen cloth positioning function, which comprises a front mold plate, a demolding plate and a screen cloth positioning mechanism, the screen cloth positioning mechanism comprises a positioning needle, a first rack, a first spring and a transmission mechanism, the positioning needle is inserted into a front mold core on the front mold plate in a sliding manner, and the first rack is arranged on the front mold core; the first rack is installed on the front mold plate in a sliding mode and connected to the positioning needle through a transmission mechanism, the first spring is arranged between the first rack and the front mold core, and the demolding plate is used for being attached to the first rack in a pressing mode during mold closing and enabling the first spring to obtain compression energy storage; when the mold is opened, the demolding plate is separated from the front mold plate so as to relieve pressing attachment to the first rack, and meanwhile, the first rack pops up under the elastic force of the first spring and drives the positioning needle to move in the opposite direction through the transmission mechanism. According to the utility model, the screen cloth is suspended and positioned through the positioning needle, so that the phenomenon of wrinkles caused by uneven local stress is not easy to occur, the appearance quality of a product is greatly improved, and the mold cost and the maintenance difficulty can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold with a front mold mesh positioning function. Background Technology

[0002] In the field of injection molding, there are many technical challenges when it comes to the production of products with mesh fabric, among which the precise placement of the mesh fabric on the mold is a key problem.

[0003] Due to its inherent material properties, mesh fabric is extremely difficult to place in molds. Because of its soft, thin, and elastic texture, it is prone to movement and twisting during handling, making it difficult to accurately place in the intended position. This severely impacts the final molding precision and quality of the product. Furthermore, mesh fabric is highly susceptible to wrinkling in the mold. Wrinkles not only damage the product's appearance, resulting in an uneven surface and reduced aesthetics, but may also affect the bonding between the plastic and the mesh fabric during injection molding, lowering the overall performance of the product, such as strength and durability.

[0004] Currently, there are existing injection molds capable of positioning mesh fabric. For example, Chinese utility model patent CN216182330U, published on April 5, 2022, discloses a precise positioning injection mold for mesh fabric. Specifically, it employs the following method: an automated arm picks up the cut mesh fabric from the carrier and simultaneously moves it into the mold. Then, the mesh fabric is implanted into the moving mold insert. At the same time, the air suction hole on the mold is opened, and air is sucked in to hold the mesh fabric in place, preventing it from falling off. The air path in the robotic arm stops. After the robotic arm retracts, the cylinder moves, driving the slider to close the mold and press down the implanted mesh fabric. The air path in the mold stops again. The current mesh positioning method has at least the following shortcomings: First, during the automated arm's suction of the mesh, due to its softness, the position and posture of the mesh may not be completely consistent each time, affecting the initial placement accuracy of the mesh in the mold. Second, the suction holes holding the mesh in place only prevent it from falling off to a certain extent; they do not effectively solve the problem of potential wrinkles. Furthermore, because the mesh has a certain degree of air permeability, if an adsorption method is used, a secondary processing step is required to create an adsorption area on the mesh, increasing manufacturing costs and processes. In addition, this positioning method relies on a complex pneumatic system and requires the use of a power unit, i.e., a cylinder, making the mold structure more complex and increasing mold costs and maintenance difficulties. Therefore, it is necessary to improve the existing technology to overcome its shortcomings. Utility Model Content

[0005] The problem to be solved by this utility model is to provide an injection mold with a front mold mesh positioning function, so as to overcome the defects of existing injection molds, such as complex positioning structure, increased manufacturing process and cost, and easy wrinkling of the mesh affecting product quality.

[0006] The technical solution adopted by this utility model to solve its technical problem is: an injection mold with a front mold mesh positioning function, including: a front mold plate and a release mold plate, a mesh positioning mechanism is provided between the front mold plate and the release mold plate, the mesh positioning mechanism includes a positioning pin, a first rack, a first spring and a transmission mechanism, the positioning pin is slidably inserted into the front mold core on the front mold plate, the first rack is slidably mounted on the front mold plate and connected to the positioning pin through the transmission mechanism, the first spring is disposed between the first rack and the front mold core, the release mold plate is used to press against the first rack and compress the first spring to store energy when the mold is closed; when the mold is opened, the release mold plate separates from the front mold plate to release the pressure on the first rack, and at the same time the first rack pops out under the elastic force of the first spring and drives the positioning pin to move in the opposite direction through the transmission mechanism, so that one end of the positioning pin extends outward from the front mold core.

[0007] As a further improvement of this utility model, the transmission mechanism includes a second rack and a gear. The second rack is slidably mounted on the front template. The positioning pin is fixedly connected to the second rack. The gear meshes between the first rack and the second rack.

[0008] As a further improvement of this utility model, the mesh positioning mechanism further includes a gear fixing block, which is fixed on the front template and has an insertion hole between the gear fixing block and the front template. The gear has a gear shaft, and both ends of the gear shaft are rotatably disposed in the insertion hole.

[0009] As a further improvement of this utility model, both the first rack and the second rack are provided with guide grooves, and the gear fixing block is provided with a guide boss that slides in cooperation with the guide groove.

[0010] As a further improvement of this utility model, the mesh positioning mechanism further includes a limiting block fixed on the front template and located on one side of the first rack. The first rack is provided with a stop step, and the limiting block is used to stop the stop step to limit the movement stroke of the first rack.

[0011] As a further improvement of this utility model, a second spring is provided between the front template and the release template.

[0012] As a further improvement of this utility model, four mesh positioning mechanisms are provided, and the positioning pins in the four mesh positioning mechanisms are respectively used to position the four corners of the mesh.

[0013] As a further improvement of this utility model, in the mold-closed state, one end of the positioning pin protrudes from the front mold core to maintain the positioning of the mesh fabric.

[0014] The beneficial effects of this utility model are as follows: This utility model provides an injection mold with a front mold mesh positioning function. By setting a mesh positioning mechanism between the front mold platen and the ejector platen of the injection mold, and utilizing the coordinated work of the positioning pin, the first rack, the first spring, and the transmission mechanism, the positioning pin extends further outward from the front mold core when the mold is open. The operator can easily suspend the mesh on the positioning pin. The mesh is suspended and positioned by the positioning pin. During the placement process, the mesh is subjected to uniform and stable force, and it is not easy to have wrinkles caused by uneven local force. This greatly improves the positioning accuracy of the mesh in the injection mold and greatly improves the appearance quality of the product. At the same time, this positioning method only relies on a simple mechanical structure to achieve mesh positioning, which reduces mold cost and maintenance difficulty, simplifies the operation process, reduces the dependence on the skill level of the operator, improves production efficiency, and further reduces production costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a top view of the injection mold with front mold mesh positioning function according to this utility model;

[0017] Figure 2 This utility model relates to an injection mold with a front mold mesh positioning function. Figure 1 A cross-sectional view along the AA direction;

[0018] Figure 3 This invention relates to an injection mold with a front mold mesh positioning function. Figure 2 Enlarged view of part C in the image;

[0019] Figure 4 This is a perspective view of the mesh positioning mechanism in the injection mold with front mold mesh positioning function according to this utility model;

[0020] Figure 5 This is a perspective view of the mesh positioning mechanism in the injection mold with front mold mesh positioning function according to this utility model.

[0021] Figure 6 This utility model relates to an injection mold with a front mold mesh positioning function. Figure 1 A cross-sectional view along the BB direction;

[0022] Figure 7 This is a bottom view of the front mold core and positioning pin in the injection mold with front mold mesh positioning function of this utility model.

[0023] Referring to the accompanying drawings, the following explanations are provided:

[0024] 1. Front mold plate; 2. Demolding mold plate; 3. Positioning pin; 4. First rack; 401. Guide groove; 402. Stop step; 5. First spring; 6. Front mold core; 7. Second rack; 8. Gear; 9. Gear fixing block; 901. Guide boss; 10. Gear shaft; 11. Limiting block; 12. Second spring; 13. Front mold fixing plate; 100. Mesh fabric; 200. Injection molded product. Detailed Implementation

[0025] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0028] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0029] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0030] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0031] This utility model provides an injection mold with a front mold mesh positioning function, including a front mold part and a rear mold part. The rear mold part adopts existing known technology and does not involve the improvement to be made in this application, so it will not be described in detail.

[0032] See Figure 1 and Figure 2 The front mold part includes a front mold fixing plate 13, a stripping plate 2 and a front plate 1 arranged from top to bottom, and a front mold core 6 is fixedly provided at the bottom of the front plate 1.

[0033] As one of the important improvements in this application, such as Figure 2 and Figure 3 As shown, the present invention provides a mesh positioning mechanism between the front template 1 and the release template 2. The mesh positioning mechanism includes a positioning pin 3, a first rack 4, a first spring 5 and a transmission mechanism. The positioning pin 3 slides and inserts into the front mold core 6 at the bottom of the front template 1 in the vertical direction (i.e. the opening and closing direction of the injection mold). The lower end of the positioning pin 3 is set as the positioning end, which is used to hang the mesh 100.

[0034] Furthermore, the first rack 4 is slidably mounted on the front mold plate 1 in a vertical direction and connected to the positioning pin 3 through a transmission mechanism. The first spring 5 is disposed between the first rack 4 and the front mold core 6, and the first spring 5 applies an upward elastic force to the first rack 4. The ejector plate 2 is used to press against the first rack 4 during mold closing and to compress and store energy in the first spring 5. During mold opening, the ejector plate 2 separates from the front mold plate 1 to release the pressure on the first rack 4. At the same time, the first rack 4 pops upward under the elastic force of the first spring 5 and drives the positioning pin 3 to move in the opposite direction, i.e., downward, through the transmission mechanism, so that the positioning end of the positioning pin 3 extends further outward from the front mold core 6, thereby facilitating the hanging of the mesh fabric 100 on the positioning end of the positioning pin 3.

[0035] This invention establishes a mesh positioning mechanism between the front mold plate 1 and the ejector plate 2 of an injection mold. Utilizing the coordinated operation of the positioning pin 3, the first rack 4, the first spring 5, and the transmission mechanism, the positioning pin 3 extends further outward from the front mold core 6 when the mold is open. Operators can easily suspend the mesh 100 on the positioning pin 3, ensuring that the mesh 100 is accurately placed in the preset position each time. This significantly improves the positioning accuracy of the mesh 100 in the injection mold, providing a good foundation for subsequent injection molding and effectively avoiding product defects caused by positional deviations of the mesh 100.

[0036] Meanwhile, the positioning method adopted in this invention fundamentally reduces the possibility of wrinkles caused by improper placement of the mesh fabric 100 in the mold. By suspending and positioning the mesh fabric 100 with positioning pins 3, the mesh fabric 100 is subjected to uniform and stable force during placement, reducing the likelihood of wrinkles caused by uneven localized force. This significantly improves the product's appearance quality, making the surface of the injection-molded product 200 with the mesh fabric 100 smoother and more even, enhancing the product's aesthetics and market competitiveness. Furthermore, this positioning method eliminates the complex pneumatic system of existing technologies, relying solely on a simple mechanical structure to position the mesh fabric 100. This reduces mold costs and maintenance difficulty, simplifies the operation process, reduces reliance on operator skill levels, improves production efficiency, and further reduces production costs.

[0037] It is worth mentioning that, in the mold-closed state, the positioning pin 3 has at least a partial protrusion extending from the front mold core 6, ensuring that the positioning pin 3 maintains the positioning of the mesh fabric 100 throughout the injection molding process, preventing wrinkles from forming in the mesh fabric 100. Since the length of the positioning end protruding from the front mold core 6 in the mold-closed state is less than the wall thickness of the injection-molded product 200, it does not affect the appearance of the injection-molded product 200.

[0038] like Figure 7 As shown, in this embodiment, four mesh positioning mechanisms are specifically provided. The positioning pins 3 in the four mesh positioning mechanisms are used to position the four corners of the mesh, so that the mesh 100 is subjected to uniform and stable force during placement, and wrinkles caused by uneven local force are not likely to occur.

[0039] See Figures 3 to 5The transmission mechanism includes a second rack 7 and a gear 8. The second rack 7 is slidably mounted on the front template 1 in a vertical direction, and the teeth on the second rack 7 are aligned with the teeth on the first rack 4. The positioning pin 3 is fixedly connected to the second rack 7 by screws, and the gear 8 meshes between the first rack 4 and the second rack 7. Thus, when the first rack 4 is ejected upward under the elastic force of the first spring 5, the second rack 7 and the positioning pin 3 slide downward under the transmission of the gear 8; when the first rack 4 moves downward under the pressure of the release template 2, the second rack 7 and the positioning pin 3 slide upward under the transmission of the gear 8.

[0040] In addition, the mesh positioning mechanism also includes two gear fixing blocks 9 and a limiting block 11. Both gear fixing blocks 9 are fixed to the front template 1, and each gear fixing block 9 has an insertion hole between itself and the front template 1. A gear shaft 10 is mounted on the gear 8, with both ends of the gear shaft 10 rotatably positioned in their respective insertion holes. The limiting block 11 is fixed to the front template 1 and located on one side of the first rack 4. The first rack 4 has a stop step 402. During mold opening, when the first rack 4 springs upward under the force of the first spring 5, the limiting block 11 stops the stop step 402 to limit the travel of the first rack 4.

[0041] See Figure 5 The first rack 4 and the second rack 7 each have guide grooves 401 on their front and rear sides in the vertical direction. The two gear fixing blocks 9 each have guide bosses 901 that slide in cooperation with the guide grooves 401. With the cooperation of the guide bosses 901 and the guide grooves 401, the first rack 4 and the second rack 7 can only slide in the vertical direction, and the stability of the sliding of the first rack 4 and the second rack 7 can also be improved.

[0042] See Figure 6 A second spring 12 is also provided between the front template 1 and the stripping template 2.

[0043] The mold opening sequence of this utility model injection mold with front mold mesh positioning function is the same as that of the three-plate mold commonly found in the market. During the mold opening process, under the elastic force of the second spring 12, the ejector plate 2 and the front plate 1 open, the ejector plate 2 releases the pressure on the first rack 4, and the first rack 4 pops upward under the elastic force of the first spring 5 until the stop step 402 stops on the limit block 11. At the same time, the first rack 4 drives the positioning pin 3 to move downward relative to the front mold core 6 through the gear 8 and the second rack 7, so that the positioning end of the positioning pin 3 extends further downward from the front mold core 6. In the fully open mold state, the operator suspends the mesh fabric 100 on the four positioning pins 3. Then the injection mold begins to close. The ejector plate 2 presses the first rack 4 downward. At the same time, the first rack 4 drives the positioning pins 3 to move upward relative to the front mold core 6 through the gear 8 and the second rack 7 until the mold is fully closed. In this state, the positioning end of the positioning pin 3 has at least a partial protrusion from the front mold core 6, so that the mesh fabric 100 will not detach from the positioning pin 3 and prevent the mesh fabric 100 from wrinkling.

[0044] Therefore, this utility model of an injection mold with a front mold mesh positioning function, by setting a mesh positioning mechanism between the front mold platen 1 and the ejector platen 2 of the injection mold, utilizes the coordinated work of the positioning pin 3, the first rack 4, the first spring 5 and the transmission mechanism. In the mold-opening state, the positioning pin 3 extends further outward from the front mold core 6, allowing the operator to easily suspend the mesh 100 on the positioning pin 3. The positioning pin 3 suspends and positions the mesh 100, ensuring that the mesh 100 is evenly and reliably stressed during placement, preventing wrinkles caused by uneven local stress. This greatly improves the positioning accuracy of the mesh 100 in the injection mold and significantly improves the product's appearance quality. At the same time, this positioning method relies on a simple mechanical structure to achieve the positioning of the mesh 100, reducing mold costs and maintenance difficulty, simplifying the operation process, reducing reliance on the operator's skill level, improving production efficiency, and further reducing production costs.

[0045] The above description is merely a specific embodiment of this application, but the scope of protection of this application 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 application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An injection mold with a front mold mesh positioning function, comprising a front mold plate (1) and a release mold plate (2), characterized in that: A mesh positioning mechanism is provided between the front template (1) and the release template (2). The mesh positioning mechanism includes a positioning pin (3), a first rack (4), a first spring (5), and a transmission mechanism. The positioning pin (3) is slidably inserted into the front mold core (6) on the front template (1). The first rack (4) is slidably mounted on the front template (1) and connected to the positioning pin (3) through the transmission mechanism. The first spring (5) is disposed between the first rack (4) and the front mold core (6). The release template (2) is used to press against the first rack (4) when the mold is closed and to compress and store energy in the first spring (5). When the mold is opened, the release template (2) separates from the front template (1) to release the pressure on the first rack (4). At the same time, the first rack (4) pops out under the elastic force of the first spring (5) and drives the positioning pin (3) to move in the opposite direction through the transmission mechanism, so that one end of the positioning pin (3) extends outward from the front mold core (6).

2. The injection mold with front mold mesh positioning function according to claim 1, characterized in that: The transmission mechanism includes a second rack (7) and a gear (8). The second rack (7) is slidably mounted on the front template (1). The positioning pin (3) is fixedly connected to the second rack (7). The gear (8) meshes between the first rack (4) and the second rack (7).

3. The injection mold with front mold mesh positioning function according to claim 2, characterized in that: The mesh positioning mechanism also includes a gear fixing block (9), which is fixed on the front template (1). An insertion hole is provided between the gear fixing block (9) and the front template (1). A gear shaft (10) is provided on the gear (8), and both ends of the gear shaft (10) are rotatably disposed in the insertion hole.

4. The injection mold with front mold mesh positioning function according to claim 3, characterized in that: The first rack (4) and the second rack (7) are both provided with guide grooves (401), and the gear fixing block (9) is provided with a guide boss (901) that slides with the guide grooves (401).

5. The injection mold with front mold mesh positioning function according to claim 1, characterized in that: The mesh positioning mechanism further includes a limiting block (11) fixed on the front template (1) and located on one side of the first rack (4). The first rack (4) is provided with a stop step (402). The limiting block (11) is used to stop the stop step (402) to limit the movement stroke of the first rack (4).

6. The injection mold with front mold mesh positioning function according to claim 1, characterized in that: A second spring (12) is provided between the front template (1) and the release template (2).

7. The injection mold with front mold mesh positioning function according to claim 1, characterized in that: The mesh positioning mechanism is provided in four parts, and the positioning pins (3) in the four mesh positioning mechanisms are respectively used to position the four corners of the mesh.

8. The injection mold with front mold mesh positioning function according to claim 7, characterized in that: In the mold-closed state, one end of the positioning pin (3) protrudes from the front mold core (6) to maintain the positioning of the mesh fabric (100).

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