Extrusion molding die for processing plastic products

Abstract

The utility model relates to the technical field of dies, and discloses an extrusion forming die for processing plastic products, which comprises a lower fixing plate and an upper fixing plate, a fixed die is fixedly arranged on the lower end face of the upper fixing plate, a movable die is fixedly connected to the upper end face of the lower fixing plate through a plurality of connecting columns, the movable die comprises a die holder, and the die holder is fixedly connected with the fixed die. A mold core is fixedly arranged at the center of the upper end face of the mold base, sliding grooves are formed in the upper side and the lower side of the upper end face of the mold base correspondingly, check blocks are arranged in the two sliding grooves in a sliding mode correspondingly, hydraulic cylinders are fixedly arranged at the upper end and the lower end of the mold base correspondingly, and the extending ends of the two hydraulic cylinders are fixedly connected with the two check blocks correspondingly. During demolding, the hydraulic cylinders on the two sides can be started to drive the stop blocks to move, so that the stop blocks are separated from a workpiece, the contact area between the mold and the workpiece is reduced, the situation of adhesion of the workpiece during demolding is reduced, the demolding efficiency is improved, and defective products are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to an extrusion molding mold for processing plastic products. Background Technique

[0002] Plastic product molding molds are important tools for manufacturing plastic products. They can inject, extrude, blow mold, or press molten plastic materials into the required shapes. During the extrusion molding process, plastic raw materials are heated and melted by an extruder and then extruded from the extrusion head to form plastic parts of the required shapes. The molding cavity of the mold keeps the plastic parts in the required shapes and sizes and conducts preliminary cooling. Cooling can help the plastic parts further cool and solidify to obtain the final shapes and properties.

[0003] After the workpiece is formed in an injection mold, demolding is required. Currently, the demolding method is mostly to eject by ejector pins. This ejection form will cause friction between the workpiece and the mold. Due to the large contact area, if the plastic part is not fully formed and adheres to the mold surface, directly ejecting for demolding is likely to result in defective products. Therefore, those skilled in the art have provided an extrusion molding mold for processing plastic products to solve the problems raised in the above background technique. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art, and to propose an extrusion molding mold for processing plastic products. When this mold is demolded, the hydraulic cylinders on both sides can be started to drive the movement of the blocks, so that the blocks are separated from the workpiece, reducing the contact area between the mold and the workpiece, reducing the occurrence of adhesion of the workpiece during demolding, improving the demolding efficiency, and reducing defective products.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An extrusion molding mold for processing plastic products, including a lower fixing plate and an upper fixing plate. A fixed mold is fixedly arranged on the lower end surface of the upper fixing plate, and a moving mold is fixedly connected to the upper end surface of the lower fixing plate through a plurality of connecting columns;

[0007] The moving mold includes a mold base. A core is fixedly arranged at the center of the upper end surface of the mold base. Sliding grooves are formed on both the upper and lower sides of the upper end surface of the mold base. Blocks are slidably arranged inside the two sliding grooves. Hydraulic cylinders are fixedly arranged at both the upper and lower ends of the mold base. The extending ends of the two hydraulic cylinders are respectively fixedly connected to the two blocks;

[0008] A cooling pipe is fixedly arranged inside the moving mold. The cooling pipe includes a curved pipe body, and liquid passing pipes are fixedly connected to both ends of the curved pipe body;

[0009] Through the above technical solution, when demolding, the hydraulic cylinders on the upper and lower sides can be activated to drive the stoppers to move, so that the stoppers are separated from the workpiece, reducing the contact area between the mold and the workpiece, thereby reducing the resistance between the workpiece and the mold during demolding, reducing the occurrence of the workpiece sticking during demolding, improving the demolding efficiency, and at the same time, it can also reduce the probability of defective products during processing and improve the processing quality. The inside of the cooling pipe can be filled with circulating cooling liquid, thereby effectively improving the workpiece forming rate. At the same time, the cooling pipe adopts a curved pipe body structure, and the curved pipe body structure enables the cooling liquid to fully surround the core, with high cooling efficiency and fast forming rate.

[0010] Further, a top plate is arranged between the lower fixed plate and the moving mold, and a plurality of ejector pins are fixedly arranged on the surface of the top plate, and the plurality of ejector pins all penetrate into the core;

[0011] Through the above technical solution, the arranged ejector pins can be pushed by the top plate, so as to eject the core and demold the plastic part.

[0012] Further, a spring damper rod is fixedly arranged at the center of the top plate, and the extending end of the spring damper rod is fixedly connected to the moving mold;

[0013] Through the above technical solution, the arranged spring damper rod can play a damping and buffering role when the top plate ejects and resets, reducing the impact, preventing mechanical collision, and also ensuring that the top plate can be reset smoothly.

[0014] Further, buffer springs are sleeved on the outer ends of the plurality of ejector pins;

[0015] Through the above technical solution, the arranged buffer springs are used to play a buffering role through their own elastic force.

[0016] Further, guide rods are fixedly arranged on both sides inside the sliding groove, and both ends of the stopper are slidably sleeved on the guide rods;

[0017] Through the above technical solution, the arranged guide rods can make the stopper slide stably and are not prone to deviation.

[0018] Further, the ends of the two liquid supply pipes both extend out of the outer end of the mold base;

[0019] Through the above technical solution, the cooling liquid is circulated through the two liquid supply pipes.

[0020] Further, guide rods are fixedly connected to the four corners of the upper fixed plate, and the lower fixed plate is slidably sleeved on the guide rods;

[0021] Through the above technical solution, the arranged guide rods are used to make the lower fixed plate move stably.

[0022] Furthermore, a cavity is formed at the center of the lower end face of the fixed mold, and a feeding port communicating with the cavity is formed at the center of the upper fixing plate;

[0023] Through the above technical solution, the injection molding machine injects molten plastic through the feeding port.

[0024] The utility model has the following beneficial effects:

[0025] 1. An extrusion molding die for processing plastic products proposed by the utility model, through the arranged hydraulic cylinders, chutes and stoppers, enables the die to drive the stoppers to move when demolding, so that the stoppers are separated from the workpiece, reducing the contact area between the die and the workpiece, thereby reducing the resistance between the workpiece and the die during demolding, reducing the occurrence of workpiece adhesion during demolding, improving the demolding efficiency, and at the same time, reducing the probability of defective products during processing and improving the processing quality.

[0026] 2. An extrusion molding die for processing plastic products proposed by the utility model, a cooling pipe is arranged inside the moving mold of the die, and circulating cooling liquid can be introduced into the cooling pipe, thereby effectively improving the workpiece forming rate. At the same time, the cooling pipe adopts a curved pipe body structure, and the curved pipe body structure enables the cooling liquid to fully surround the core, with high cooling efficiency and fast forming rate. Description of the Drawings

[0027] Figure 1 is the overall structure of an extrusion molding die for processing plastic products proposed by the utility model Figure 1 ;

[0028] Figure 2 is the overall structure of an extrusion molding die for processing plastic products proposed by the utility model Figure 2 ;

[0029] Figure 3 is the front view of an extrusion molding die for processing plastic products proposed by the utility model;

[0030] Figure 4 is the structural diagram of the moving mold of an extrusion molding die for processing plastic products proposed by the utility model;

[0031] Figure 5 is the structural diagram of the cooling pipe of an extrusion molding die for processing plastic products proposed by the utility model.

[0032] Legend Explanation:

[0033] 1. Lower fixing plate; 2. Top plate; 3. Movable mold; 31. Mold base; 32. Cooling pipe; 321. Curved pipe body; 322. Liquid passing pipe; 33. Core; 34. Slide groove; 35. Stopper; 36. Guide rod; 37. Hydraulic cylinder; 4. Connecting column; 5. Guide rod; 6. Upper fixing plate; 7. Feeding port; 8. Spring damper rod; 9. Fixed mold; 10. Cavity; 11. Ejector pin; 12. Buffer spring. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] Refer to Figures 1-5 , an embodiment provided by the present invention: an extrusion molding die for processing plastic products, including a lower fixing plate 1 and an upper fixing plate 6. A fixed mold 9 is fixedly arranged on the lower end surface of the upper fixing plate 6, and a movable mold 3 is fixedly connected to the upper end surface of the lower fixing plate 1 through a plurality of connecting columns 4.

[0036] The movable mold 3 includes a mold base 31. A core 33 is fixedly arranged at the center of the upper end surface of the mold base 31. Slide grooves 34 are formed on both the upper and lower sides of the upper end surface of the mold base 31. Stoppers 35 are slidably arranged inside the two slide grooves 34. Hydraulic cylinders 37 are fixedly arranged at both the upper and lower ends of the mold base 31. The extending ends of the two hydraulic cylinders 37 are respectively fixedly connected to the two stoppers 35.

[0037] A cooling pipe 32 is fixedly arranged inside the movable mold 3. The cooling pipe 32 includes a curved pipe body 321, and liquid passing pipes 322 are fixedly connected to both ends of the curved pipe body 321.

[0038] A top plate 2 is arranged between the lower fixing plate 1 and the movable mold 3. A plurality of ejector pins 11 are fixedly arranged on the surface of the top plate 2. The plurality of ejector pins 11 all penetrate into the core 33. The arranged ejector pins 11 can be pushed by the top plate 2, so as to eject the core 33 and demold the plastic part.

[0039] A spring damper rod 8 is fixedly arranged at the center of the top plate 2. The extending end of the spring damper rod 8 is fixedly connected to the movable mold 3. The arranged spring damper rod 8 can play a damping and buffering role when the top plate 2 ejects and resets, reduce impact, prevent mechanical collision, and also ensure that the top plate 2 can be reset smoothly.

[0040] Buffer springs 12 are sleeved on the outer ends of the plurality of ejector pins 11. The arranged buffer springs 12 are used to play a buffering role through their own elastic force.

[0041] On both inner sides of the sliding groove 34, guide rods 36 are fixedly arranged. Both ends of the stopper 35 are slidably sleeved on the guide rods 36. The arranged guide rods 36 can enable the stopper 35 to slide stably and are not prone to skew.

[0042] The ends of the two liquid supply pipes 322 both extend out of the outer end of the mold base 31, and the coolant is circulated through the two liquid supply pipes 322.

[0043] Guide rods 5 are fixedly connected to the four corners of the upper fixing plate 6, and the lower fixing plate 1 is slidably sleeved on the guide rods 5. The arranged guide rods 5 are used to make the lower fixing plate 1 move stably.

[0044] A cavity 10 is opened at the center of the lower end surface of the fixed mold 9, and a material injection port 7 communicating with the cavity 10 is opened at the center of the upper fixing plate 6. The injection molding machine injects molten plastic through the material injection port 7.

[0045] Working principle: During demolding, coolant is introduced into the cooling pipe 32. The coolant exchanges heat with the mold, thereby reducing the temperature of the workpiece and enabling the workpiece to be quickly formed. Then, the moving mold 3 is separated from the fixed mold 9, and the hydraulic cylinder 37 of the moving mold 3 is started to drive the two stoppers 35 to open, thereby separating from the workpiece. After the stoppers 35 are opened, the contact area between the mold and the workpiece can be reduced, thereby reducing the resistance between the workpiece and the mold during demolding, reducing the occurrence of the workpiece sticking during demolding, reducing the probability of defective products during processing, and improving the processing quality. Then, the moving mold 3 continues to move. After reaching the limited position, the spring damping rod 8 contacts the fixed structure and pushes the top plate 2. Then, the top plate 2 drives each ejector pin 11 to eject, thereby demolding the workpiece.

[0046] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An extrusion molding die for processing plastic products, comprising a lower fixing plate (1) and an upper fixing plate (6), characterized in that: The lower end surface of the upper fixed plate (6) is fixedly provided with a fixed mold (9), and the upper end surface of the lower fixed plate (1) is fixedly connected to a movable mold (3) via a plurality of connecting columns (4); The movable mold (3) comprises a mold base (31), a core (33) is fixedly arranged at the center of the upper end surface of the mold base (31), sliding grooves (34) are provided on both upper and lower sides of the upper end surface of the mold base (31), and stoppers (35) are slidably arranged inside the two sliding grooves (34), and hydraulic cylinders (37) are fixedly arranged at both upper and lower ends of the mold base (31), and the protruding ends of the two hydraulic cylinders (37) are respectively fixedly connected to the two stoppers (35); A cooling pipe (32) is fixedly arranged inside the movable mold (3), and the cooling pipe (32) comprises a curved tube body (321), and both ends of the curved tube body (321) are fixedly connected to liquid passage pipes (322).

2. The extrusion molding die for processing plastic products according to claim 1, characterized in that: A top plate (2) is arranged between the lower fixed plate (1) and the movable mold (3), and a plurality of ejector pins (11) are fixedly arranged on the surface of the top plate (2), and the plurality of ejector pins (11) are all passed into the interior of the core (33).

3. The extrusion molding die for processing plastic products according to claim 2, characterized in that: A spring damping rod (8) is fixedly arranged at the center of the top plate (2), and the protruding end of the spring damping rod (8) is fixedly connected to the movable mold (3).

4. The extrusion molding die for processing plastic products according to claim 2, characterized in that: The outer ends of the plurality of ejector pins (11) are all sleeved with buffer springs (12).

5. The extrusion molding die for processing plastic products according to claim 1, characterized in that: Guide rods (36) are fixedly arranged on both sides of the interior of the slide groove (34), and both ends of the stopper (35) are slidably sleeved with the guide rods (36).

6. The extrusion molding die for processing plastic products according to claim 1, characterized in that: The ends of the two liquid passages (322) both extend out of the outer end of the mold base (31).

7. The extrusion molding die for processing plastic products according to claim 1, characterized in that: The four corners of the upper fixed plate (6) are fixedly connected with guide rods (5), and the lower fixed plate (1) is slidably sleeved with the guide rods (5).

8. The extrusion molding die for processing plastic products according to claim 1, characterized in that: A cavity (10) is provided at the center of the lower end surface of the fixed mold (9), and an injection port (7) communicating with the cavity (10) is provided at the center of the upper fixed plate (6).

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