Leakage-proof injection molding head for injection molding machine

Abstract

The utility model discloses a leakproof injection molding head for an injection molding machine, which comprises an injection molding head, the injection molding head is provided with a trigger structure, the outer wall of the injection molding head is provided with a blocking structure for blocking an opening of the injection molding head, and the blocking structure is matched with the trigger structure. When the temperature in the injection molding head reaches a proper temperature, the deformation of the memory alloy spring can be recovered, the insertion plate is driven to block the box body, the heat supply carrier is prevented from continuously flowing to supply heat, the intelligent temperature control mechanism can automatically adjust heat supply according to the actual temperature requirement of the injection molding head, unnecessary energy waste is avoided, and the purposes of energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine equipment technology, specifically to a leak-proof injection head for injection molding machines. Background Technology

[0002] Injection molding machines are molding equipment widely used in the plastics processing industry. They are mainly used to heat and melt plastic granules, inject them into the mold cavity under high pressure, and then cool and solidify them to form plastic products of the desired shape. The working principle is to use the thermophysical properties of plastics. The material is added from the hopper into the barrel, heated by the heating coil to melt the material, and then the screw rotates to push the molten material forward and compact it. Finally, the molten plastic is injected into the mold cavity through the nozzle. The structure of an injection molding machine usually includes an injection system, a mold clamping system, a hydraulic system, a heating and cooling system, and a control system.

[0003] However, existing injection molding machines have some problems during use. When the machine is stopped, leakage is likely to occur at the injection port, which not only wastes molten plastic but also pollutes the work area. In addition, when the downtime is long, the molten plastic in the injection port is prone to cool and solidify, which can cause blockage of the injection port and affect subsequent production. These problems not only increase production costs but also reduce production efficiency.

[0004] To address the aforementioned issues, there is an urgent need for innovative design based on the existing injection head. Utility Model Content

[0005] This utility model addresses the problem that existing technical solutions are too simplistic by providing a leak-proof injection head for injection molding machines that is significantly different from existing technologies, thus solving the problems mentioned in the background.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a leak-proof injection head for an injection molding machine, comprising an injection head, wherein the injection head is provided with a triggering structure, and the outer wall of the injection head is provided with a sealing structure for blocking the opening of the injection head, and the sealing structure cooperates with the triggering structure, and the injection head is provided with a temperature control structure for heat preservation.

[0007] Preferably, the triggering structure includes a groove, an inner ring, a baffle, a fixing block, a return spring, an outer ring, and a locking block. The injection head has a groove, and the inner ring is slidably connected and engaged within the groove. A baffle is connected between the inner walls of the inner ring. The injection head is connected to a fixing block, and a return spring is connected to the fixing block. The end of the return spring is connected to an outer ring. The outer ring is slidably fitted onto the outer wall of the injection head, and a locking block is connected to the outer wall of the outer ring.

[0008] Preferably, the inner and outer rings are made of magnetite material with two opposite magnetic poles.

[0009] Preferably, the sealing structure includes an installation block, a rotating rod, a rotating groove, and a sealing plate. The installation block is externally connected to the injection head, and a rotating rod is rotatably connected through the installation block. The upper outer wall of the rotating rod is provided with a rotating rod, which is used to cooperate with the locking block. The lower end of the rotating rod is connected to a sealing plate, and the sealing plate fits against the opening of the injection head.

[0010] Preferably, the rotating groove is curved on the outer wall of the rotating rod.

[0011] Preferably, the temperature control structure includes a heat-conducting rod, a shape memory alloy spring, a insert plate, a housing, a heat-conducting pipe, and an input pipe. The heat-conducting rod is provided inside the injection head, and the end of the heat-conducting rod passes through the outer wall of the injection head and is connected to the shape memory alloy spring. The end of the shape memory alloy spring is connected to the insert plate, which is engaged and slidably connected to the housing. The bottom of the housing is connected to the heat-conducting pipe, which is wrapped around the outer wall of the injection head. The top of the housing is connected to the input pipe.

[0012] Compared with existing technologies, the beneficial effects of this invention are as follows: The leak-proof injection head used in this injection molding machine, through the coordinated action of the triggering structure and the sealing structure, allows the triggering structure to disengage from the injection port during injection, ensuring the normal operation of the injection process. When injection stops, the triggering structure resets, and the sealing structure quickly resets to block the injection port. This design effectively prevents leakage from the injection port when the machine stops, avoiding waste of molten plastic and contamination of the work area, thus improving the cleanliness and safety of the production environment.

[0013] During prolonged downtime, the molten plastic inside the injection port can easily cool and solidify, leading to blockage and affecting subsequent production. This patent addresses this issue by using a temperature control structure with a heat-conducting rod for temperature transfer. When the internal temperature of the injection head decreases, the shape memory alloy spring deforms and contracts due to the temperature change, causing the insert plate to move outward within the housing. This allows the heat supply medium (such as water or gas) in the input pipe to smoothly pass through the housing and enter the heat-conducting pipe to heat the injection head. This automatic temperature control function effectively prevents the molten plastic inside the injection port from cooling and solidifying, avoiding blockage and ensuring the continuity and stability of production.

[0014] Once the temperature inside the injection head reaches the appropriate level, the shape memory alloy spring recovers its original shape, causing the insert plate to seal the housing and prevent the heating medium from continuing to flow and provide heat. This intelligent temperature control mechanism can automatically adjust the heating supply according to the actual temperature requirements of the injection head, avoiding unnecessary energy waste and achieving the goal of energy conservation and environmental protection. At the same time, by precisely controlling the heating process, it reduces changes in the properties of the molten plastic caused by excessively high or low temperatures, further improving product quality.

[0015] The entire temperature control and sealing process is automated, requiring no manual intervention. The coordinated operation of the triggering and sealing structures, along with the intelligent adjustment of the temperature control structure, enables the injection molding machine to automatically seal and unseal the injection port and regulate the temperature during shutdown and startup. This automated design not only improves production efficiency but also reduces the labor intensity of operators and minimizes the possibility of human error. Attached Figure Description

[0016] Figure 1 This is a frontal cross-sectional view of the inner ring of this utility model when it is away from the heat-conducting rod.

[0017] Figure 2 This is a frontal cross-sectional view of the inner ring of this utility model when it is close to the heat-conducting rod.

[0018] Figure 3 This is a front view structural diagram of the present invention;

[0019] Figure 4 This is a top view schematic diagram of the inner ring structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the rotating groove structure of this utility model.

[0021] In the diagram: 1. Injection head; 2. Triggering structure; 201. Slide groove; 202. Inner ring; 203. Baffle; 204. Fixing block; 205. Return spring; 206. Outer ring; 207. Locking block; 3. Sealing structure; 301. Mounting block; 302. Rotating rod; 303. Rotating groove; 304. Sealing plate; 4. Temperature control structure; 401. Heat-conducting rod; 402. Memory alloy spring; 403. Insert plate; 404. Box body; 405. Heat-conducting pipe; 406. Input pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-5This utility model provides a technical solution: a leak-proof injection head for an injection molding machine, including an injection head 1, a trigger structure 2, a slide 201, an inner ring 202, a baffle 203, a fixing block 204, a reset spring 205, an outer ring 206, a locking block 207, a sealing structure 3, a mounting block 301, a rotating rod 302, a rotating groove 303, a sealing plate 304, a temperature control structure 4, a heat-conducting rod 401, a shape memory alloy spring 402, an insert plate 403, a box body 404, a heat-conducting pipe 405, and an input pipe 406. The injection head 1 is provided with a trigger structure 2, and the outer wall of the injection head 1 is equipped with a sealing structure 3 for blocking the opening of the injection head 1. The sealing structure 3 and the trigger structure 2 cooperate with each other. The injection head 1 is equipped with a temperature control structure 4 for heat preservation.

[0024] The trigger structure 2 includes a slide groove 201, an inner ring 202, a baffle 203, a fixing block 204, a return spring 205, an outer ring 206, and a locking block 207. The injection head 1 has a slide groove 201 inside, and the inner ring 202 is slidably connected and engaged in the slide groove 201. The baffle 203 is connected between the inner walls of the inner ring 202. The fixing block 204 is connected to the outside of the injection head 1, and the return spring 205 is connected to the fixing block 204. The end of the return spring 205 is connected to the outer ring 206. The outer ring 206 is slidably connected to the outer wall of the injection head 1, and the locking block 207 is connected to the outer wall of the outer ring 206.

[0025] The inner ring 202 and the outer ring 206 are made of magnetite with opposite magnetic poles.

[0026] The sealing structure 3 includes a mounting block 301, a rotating rod 302, a rotating groove 303, and a sealing plate 304. The mounting block 301 is externally connected to the injection head 1, and the rotating rod 302 is rotatably connected through the mounting block 301. The upper outer wall of the rotating rod 302 is provided with a rotating rod 302, which is used to cooperate with the locking block 207. The lower end of the rotating rod 302 is connected to the sealing plate 304, and the sealing plate 304 fits against the opening of the injection head 1.

[0027] The rotating groove 303 is curved on the outer wall of the rotating rod 302.

[0028] The temperature control structure 4 includes a heat-conducting rod 401, a shape memory alloy spring 402, a plate 403, a box 404, a heat-conducting pipe 405, and an input pipe 406. The heat-conducting rod 401 is provided inside the injection head 1, and the end of the heat-conducting rod 401 passes through the outer wall of the injection head 1 and is connected to the shape memory alloy spring 402. The end of the shape memory alloy spring 402 is connected to the plate 403. The plate 403 is engaged and slidably connected inside the box 404. The bottom of the box 404 is connected to the heat-conducting pipe 405, and the heat-conducting pipe 405 is wrapped around the outer wall of the injection head 1. The top of the box 404 is connected to the input pipe 406.

[0029] Working principle: According to Figure 1As shown, when injection molding is required, the molten plastic contacts the baffle 203, causing the inner ring 202 to move downward in the slide groove 201. The magnetic poles attract each other, causing the outer ring 206 to move downward on the outer wall of the injection head 1. The return spring 205 is stretched by force. As the outer ring 206 moves downward, it is engaged in the rotating groove 303 on the rotating rod 302 by the locking block 207 connected to it. As the outer ring 206 and the locking block 207 continue to move downward, the locking block 207 and the rotating groove 303 drive the rotating rod 302 to rotate. The sealing plate 304 at the lower end of the rotating rod 302 is released from the obstruction of the injection port at the bottom of the injection head 1, allowing it to perform normal injection molding.

[0030] When the operation stops, there is no further molten plastic pushing the baffle 203. The return spring 205 drives the outer ring 206 to reset. Under the action of magnetic pole attraction, the outer ring 206 moves and drives the inner ring 202 to move and reset in the slide groove 201. At the same time, the upward reset of the outer ring 206, through the cooperation of the locking block 207 and the rotating groove 303, drives the rotating rod 302 to reset and rotate, so that the sealing plate 304 connected to the lower end of the rotating rod 302 blocks the injection port at the bottom of the injection head 1 to prevent leakage.

[0031] The heat transfer through the heat-conducting rod 401 transfers the temperature of the molten plastic inside the injection head 1 to the shape memory alloy spring 402. When the temperature is high, the shape memory alloy spring 402 will remain in a deformed and elongated state. When the temperature of the molten plastic drops, the shape memory alloy spring 402 will contract when the temperature drops, causing the insert plate 403 to move outward from the box 404. The insert plate 403 is released from the blockage inside the box 404, allowing the heat carrier provided by the heating equipment connected to the input pipe 406 to pass through the box 404 and flow into the heat-conducting pipe 405. Through the heat transfer through the heat-conducting pipe 405, the injection head 1 is heated, raising the temperature of the molten plastic inside and preventing it from cooling and solidifying, which would affect subsequent injection molding processes. This is the working principle of the leak-proof injection head used in this injection molding machine.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. Leak-tight injection head for an injection molding machine, comprising an injection head (1), characterized in that: The injection head (1) is provided with a trigger structure (2), and the outer wall of the injection head (1) is provided with a plugging structure (3) for shielding the opening of the injection head (1), and the plugging structure (3) and the trigger structure (2) are matched with each other, and the injection head (1) is provided with a temperature control structure (4) for heat preservation. The temperature control structure (4) comprises a heat conduction rod (401), a memory alloy spring (402), a plug plate (403), a box body (404), a heat conduction pipe (405) and an input pipe (406), the heat conduction rod (401) is arranged in the injection head (1), the end of the heat conduction rod (401) is connected with the memory alloy spring (402) penetrating through the outer wall of the injection head (1), the end of the memory alloy spring (402) is connected with the plug plate (403), the plug plate (403) is clamped and slidably connected in the box body (404), the bottom of the box body (404) is connected with the heat conduction pipe (405), and the heat conduction pipe (405) is wound around the outer wall of the injection head (1), and the top of the box body (404) is connected with the input pipe (406).

2. A leakproof injection head for an injection molding machine as defined in claim 1, wherein: The trigger structure (2) comprises a sliding groove (201), an inner ring (202), a baffle (203), a fixed block (204), a reset spring (205), an outer ring (206) and a clamping block (207), the sliding groove (201) is arranged in the injection head (1), the inner ring (202) is clamped and slidably connected in the sliding groove (201), the baffles (203) are connected between the inner walls of the inner ring (202), the fixed block (204) is connected to the outer wall of the injection head (1), the reset spring (205) is connected to the fixed block (204), the end of the reset spring (205) is connected with the outer ring (206), the outer ring (206) is sleeved and slidably connected to the outer wall of the injection head (1), and the clamping block (207) is connected to the outer wall of the outer ring (206).

3. A leakproof injection head for an injection molding machine as defined in claim 2, wherein: The inner ring (202) and the outer ring (206) are magnetic stones with opposite magnetic poles.

4. The leakproof injection head for an injection molding machine according to claim 2, characterized in that: The plugging structure (3) comprises a mounting block (301), a rotating rod (302), a rotating groove (303) and a sealing plate (304), the mounting block (301) is connected to the outer wall of the injection head (1), the rotating rod (302) is rotatably connected to the mounting block (301), the rotating groove (303) is arranged on the outer wall of the rotating rod (302), and the rotating rod (302) is used for cooperating with the clamping block (207), and the sealing plate (304) is connected to the lower end of the rotating rod (302) and is attached to the opening of the injection head (1).

5. A leakproof injection head for an injection molding machine as defined in claim 4, wherein: The rotating groove (303) is arranged in a curved shape on the outer wall of the rotating rod (302).

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