Structure convenient for replacing core on hot pressing die

Abstract

The utility model relates to a structure convenient for replacing a core on a hot-pressing die, and belongs to the technical field of hot-pressing dies. Comprising a lower die base, the top of the lower die base is provided with a forming face and a plurality of cores, the bottoms of the cores are provided with connecting rods, the bottoms of the cores are in threaded connection with the connecting rods, the outer side walls of the tops of the cores are provided with key teeth, the bottoms of the connecting rods penetrate through the lower die base and a push plate, and the bottom ends of the connecting rods are fixedly connected with a bottom plate. A sleeve in sliding connection is arranged on the outer sides of the connecting rod and the core, and the bottom of the sleeve is fixedly connected with the push plate; according to the scheme, after the core in the lower die holder is abraded, the core can be screwed out from the forming surface and then replaced by a new core only by moving the lower die holder to be separated from the upper die set and using a screwdriver corresponding to the key tooth structure on the core, so that the technical problem that the whole die needs to be opened when the core is replaced in the prior art is solved; and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hot-pressing mould technical field relates to a structure that is convenient for replacing the core on hot-pressing mould. BACKGROUND

[0002] Hot-pressing mould is mainly used for producing plastic products, and is composed of an upper die and a lower die. A cavity is arranged between the upper die and the lower die. Powder, granular, pellet, and sheet plastics, or plastics similar to the shape of the product, are placed in the heated cavity of the die. Then, the die is closed and pressurized to make the plastics form and solidify or vulcanize, thereby forming a product corresponding to the structure of the cavity. Then, the die is opened, and the formed product is ejected from the lower die by a demolding mechanism, thereby facilitating the taking of the product.

[0003] In the structure of the hot-pressing mould, a core is arranged inside the die to form a structure on the product. However, the core of the existing die still has some deficiencies. After long-term use of the core inside the die, the core will be worn or damaged. Therefore, the core needs to be replaced. In the existing technology, the entire die needs to be disassembled to replace the core. Since the core is difficult to disassemble and assemble, the production efficiency is reduced. SUMMARY

[0004] The utility model discloses a structure that is convenient for replacing the core on hot-pressing mould, and solves the technical problem of how to conveniently replace the core inside the die.

[0005] The utility model discloses a structure that is convenient for replacing the core on hot-pressing mould, and solves the technical problem of how to conveniently replace the core inside the die.

[0006] In this solution, the lower mold base and the upper mold base are aligned to form a mold, and the plastic raw material is hot-pressed onto the molding surface. After the plastic product cools and solidifies inside the mold, the lower mold base is moved to open the mold. Because multiple cores are set at the top of the lower mold base and the cores are located on the molding surface, holes corresponding to the core structure are formed on the plastic product, facilitating subsequent assembly. During demolding, the push plate is pushed upward, which in turn moves the fixed sleeve upward, causing the sleeve to be pushed upward from the outside of the connecting rod and the core, thereby ejecting the unformed structure of the core and preventing breakage due to uneven force during demolding. When the core inside the lower mold base is worn, simply move the lower mold base to separate from the upper mold assembly, and use a screwdriver corresponding to the key tooth structure on the core to unscrew it from the molding surface, then replace it with a new core. In this way, the core structure can be easily replaced, creating holes with different structures on the plastic product. This solves the technical problem of needing to open the entire mold to replace the core in existing technologies, improving production efficiency.

[0007] In the aforementioned hot-press mold structure that facilitates core replacement, the molding surface is provided with several interconnected molding grooves. The core is disposed inside each molding groove, and the sleeve outside the core can be ejected from the molding groove. The molding grooves cover the entire molding surface. After the plastic raw material is molded in the molding groove, it forms a reinforcing rib structure on the product to improve the structural strength of the product.

[0008] In the aforementioned hot-press mold structure that facilitates core replacement, a portion of the core has an upward-opening annular groove inside. The annular groove on the core can form a columnar structure for forming the product.

[0009] In the aforementioned hot press mold structure that facilitates core replacement, the push plate is provided with several fixed ejector pins. The upper ends of the ejector pins are slidably connected inside the lower mold base, and each ejector pin is located inside a forming groove. The top of each ejector pin can be ejected from the forming groove. As the push plate moves upward, it also drives the ejector pins to move upward, ejecting the product from the forming surface.

[0010] In the aforementioned hot-press mold structure that facilitates core replacement, the forming groove is further provided with forming holes, which are distributed at the bottom of the forming groove where the core is located. The structure of the forming holes mates with the core to form the structure on the product.

[0011] In the aforementioned hot-pressing mold structure that facilitates core replacement, the bottom of the sleeve is provided with an outwardly protruding snap-fit ​​portion, and the bottom of the sleeve is provided with a threaded sleeve. The threaded sleeve has external threads, and the threaded sleeve is connected to the internal threads of the push plate. The snap-fit ​​portion is located between the threaded sleeve and the push plate, thus fixing the sleeve and the push plate together. The snap-fit ​​portion is clamped between the threaded sleeve and the push plate, fixing the bottom of the sleeve to the push plate, making the structure more stable.

[0012] Compared with the prior art, the utility model has the advantages of:

[0013] In the scheme, when the core in the lower die seat is worn, only need to move the lower die seat and separate from the upper die group, use the screwdriver corresponding to the key tooth structure on the core, can twist out the core from the forming surface, replace the new core, solve the technical problem that the core needs to be opened in the prior art, improve the production efficiency.

[0014] In the scheme, in the demolding process, the push plate is pushed to move upward, the sleeve connected with the push plate is driven to move upward, the sleeve is pushed out from the outside of the connecting rod and the core upward, so that the core is pushed out and demolded, and the uneven stress in the demolding process is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the three-dimensional structure schematic diagram of the utility model;

[0016] Figure 2 is the right view sectional structure schematic diagram of the utility model;

[0017] Figure 3 is Figure 2 the connecting rod top enlarged structure schematic diagram in;

[0018] Figure 4 is Figure 2 the connecting rod bottom enlarged structure schematic diagram in;

[0019] Figure 5 is the three-dimensional structure schematic diagram of two kinds of cores of the utility model.

[0020] In the drawing, 1, lower die seat, 2, forming surface, 2a, forming groove, 2a1, forming hole, 3, foot plate, 3a, push plate, 3b, thimble, 4, bottom plate, 5, core, 5a, key tooth, 5b, annular groove, 6, connecting rod, 7, sleeve, 7a, clamping part, 7b, threaded sleeve, 7b1, external thread. DETAILED DESCRIPTION

[0021] The following is a specific embodiment of the utility model and is further described in combination with the drawings, but the utility model is not limited to these embodiments. EMBODIMENT

[0022] As Figure 1As shown, the structure of the hot press mold that facilitates core replacement includes a lower mold base 1. The top of the lower mold base 1 is provided with a forming surface 2. The bottom of the lower mold base 1 is provided with a fixed foot plate 3. The bottom of the foot plate 3 is provided with a fixed base plate 4. The foot plate 3 is provided with a push plate 3a that can move longitudinally. The forming surface 2 is provided with a plurality of interconnected forming grooves 2a. The forming grooves 2a are provided with a plurality of forming holes 2a1.

[0023] like Figure 2 As shown, the lower mold base 1 is provided with a plurality of slidingly connected ejector pins 3b. The bottom of the ejector pins 3b is fixedly connected to the push plate 3a, and the top of the ejector pins 3b is located at the bottom of the forming surface 2.

[0024] like Figure 3 As shown, a core 5 is provided inside the forming hole 2a1, and a connecting rod 6 with a threaded connection is provided at the bottom of the core 5. A sleeve 7 with a sliding connection is provided on the outside of the core 5 and the connecting rod 6. The outer wall of the sleeve 7 is slidably connected to the lower mold base 1.

[0025] like Figure 4 As shown, the bottom of the connecting rod 6 is fixedly connected to the base plate 4, the bottom of the sleeve 7 is provided with an outwardly protruding snap-fit ​​part 7a, the bottom of the snap-fit ​​part 7a is provided with a threaded sleeve 7b, the outer side wall of the threaded sleeve 7b is provided with an external thread 7b1, and the threaded sleeve 7b is threadedly connected to the push plate 3a.

[0026] like Figure 5 As shown, there are cores 5 with different structures. The top of the core 5 is provided with key teeth 5a, and some of the cores 5 are provided with annular grooves 5b with openings facing upwards.

[0027] The working principle of this solution is as follows: Figures 1-5 As shown, the lower mold base 1 and the upper mold base are aligned to form the mold, and the plastic raw material is hot-pressed into shape on the forming surface 2. After the plastic product is cooled and shaped inside the mold, the lower mold base 1 is moved to open the mold. The push plate 3a drives the fixed sleeve 7 and ejector pin 3b to move upward. The ejector pin 3b pushes directly upward from the bottom of the forming surface 2 to demold the product. The sleeve 7 pushes upward from the outside of the connecting rod 6 and the core 5, thereby ejecting the unformed structure of the core 5 from the mold and avoiding breakage caused by uneven force during demolding.

[0028] When the core 5 inside the lower mold base 1 is worn, simply move the lower mold base 1 to separate it from the upper mold assembly. Using a screwdriver corresponding to the key tooth 5a structure on the core 5, the core 5 can be unscrewed from the molding surface 2, and a new core 5 can be installed. In this way, the structure of the core 5 can be easily replaced, creating holes with different structures on the plastic product. This solves the technical problem in the existing technology that the entire mold needs to be opened to replace the core 5, thus improving production efficiency.

[0029] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0030] Although the terms such as 1, lower die seat; 2, forming surface; 2a, forming groove; 2a1, forming hole; 3, foot plate; 3a, push plate; 3b, ejector pin; 4, bottom plate; 5, core; 5a, key tooth; 5b, annular groove; 6, connecting rod; 7, sleeve; 7a, clamping part; 7b, threaded sleeve; 7b1, external thread, etc. are used more frequently herein, but the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present application; any kind of additional limitation by interpreting them is contrary to the spirit of the present application.

Claims

1. A structure for facilitating replacement of a core on a hot-pressing mold, comprising a lower mold base (1), a top portion of the lower mold base (1) being provided with a molding surface (2), a bottom portion of the lower mold base (1) being provided with a fixed foot plate (3), a bottom portion of the foot plate (3) being provided with a fixed bottom plate (4), an inside of the foot plate (3) being provided with a push plate (3a) capable of moving longitudinally, characterized in that, The bottom of the lower die seat (1) is provided with several cores (5), the bottom of the core (5) is provided with a connecting rod (6), the bottom of the core (5) is threadedly connected with the connecting rod (6), the top outer side wall of the core (5) is provided with a key tooth (5a), the bottom of the connecting rod (6) penetrates the lower die seat (1) and the push plate (3a), the bottom end of the connecting rod (6) is fixedly connected with the bottom plate (4), the outer side of the connecting rod (6) and the core (5) is provided with a slidingly connected sleeve (7), and the bottom of the sleeve (7) is fixedly connected with the push plate (3a).

2. A structure for facilitating replacement of a core in a hot press mold according to claim 1, characterized by The forming surface (2) is provided with several mutually connected forming grooves (2a), the core (5) is arranged in the forming groove (2a), and the sleeve (7) on the outer side of the core (5) can be pushed out of the forming groove (2a).

3. The structure for facilitating replacement of a core in a hot press mold according to claim 2, wherein Part of the core (5) is internally provided with an upwardly open annular groove (5b).

4. The structure for facilitating replacement of a core in a hot press mold according to claim 2, wherein The push plate (3a) is provided with several fixed ejector pins (3b), the upper end of the ejector pin (3b) is slidingly connected in the lower die seat (1), the ejector pin (3b) is arranged in the forming groove (2a), and the top of the ejector pin (3b) can be pushed out of the forming groove (2a).

5. The structure for facilitating replacement of a core in a hot press mold according to claim 4, wherein The forming groove (2a) is also provided with a forming hole (2a1), and the forming hole (2a1) is arranged at the part of the forming groove (2a) where the core (5) is arranged.

6. The structure for facilitating replacement of a core in a hot press mold according to claim 1, wherein The bottom of the sleeve (7) is provided with an outwardly protruding clamping portion (7a), the bottom of the sleeve (7) is provided with a threaded sleeve (7b), the threaded sleeve (7b) is provided with external threads (7b1), the threaded sleeve (7b) is threadedly connected with the inside of the push plate (3a), the clamping portion (7a) is arranged between the threaded sleeve (7b) and the push plate (3a), and the sleeve (7) is fixedly connected with the push plate (3a).

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