Structure for improving filling balance of runner

Abstract

The utility model relates to a structure for improving runner filling balance, which comprises an injection mold body, two opposite sliding chutes are correspondingly arranged on two sides of a sub-runner on the injection mold body, sliding chute notches communicated with the sub-runner are arranged at opposite ends of the two sliding chutes, sliding blocks are arranged in the two sliding chutes in a limited and sliding manner, and the sliding blocks are arranged in the sliding chutes in a sliding manner. The width of each sliding block is matched with the width of the corresponding sliding groove, each sliding block stretches out of or retracts into the corresponding sliding groove through the corresponding sliding groove notch, and the size of the corresponding sub-runner can be changed by moving the two sliding blocks towards the center of the sub-runner in a limited mode or moving the two sliding blocks towards the two sides of the sub-runner in a limited mode. The filling balance of a runner system is improved, no redundant space for filling plastic is reserved, plastic materials are saved, and the production quality of products is better guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, and more specifically to a structure for improving flow channel filling balance. Background Art

[0002] Injection molds are tools for producing plastic products. The balance of the runners is crucial in the process of molding products with injection molds. Allowing the molten plastic to flow into the mold cavity in a balanced manner is a prerequisite for producing high-quality plastic parts. Changing the size and length of the runners can achieve a naturally balanced runner system.

[0003] The existing injection mold adjusts the flow rate of the runner by changing the height of the runner flow adjustment bolt, but the groove on the head of the runner flow adjustment bolt for changing the height increases the clamping force of the plastic in the runner, which can easily cause the plastic in the runner to stick to the film and make demolding difficult. The existing injection mold also balances the runner by using a throttling block. For example, a Chinese utility model patent discloses a runner regulating valve for an injection mold (application number: CN201720055518.4). Its regulating block is provided with a runner groove connected to the runner. The flow rate of the molten plastic in the runner is adjusted by staggering the runner groove with the runner so that the molten plastic can flow into the mold cavity through the runner in a balanced manner, but the size of the runner groove does not change, and the plastic will still fill the runner groove, wasting plastic material. Utility Model Content

[0004] In view of the above-mentioned defects in the prior art, a structure for improving the flow channel filling balance is provided.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a structure for improving the filling balance of a flow channel, comprising an injection mold body, two opposite slide grooves are correspondingly arranged on both sides of the branch flow channel on the injection mold body, and the opposite ends of the two slide grooves are each provided with a slide groove notch connecting the branch flow channel, and sliders are provided in the two slide grooves for limiting sliding, the width of each slider matches the width of its corresponding slide groove, and each slider extends out of or retracts into the corresponding slide groove through the corresponding slide groove notch.

[0006] Preferably, each of the sliders is provided with a waist-shaped slider through hole extending along the sliding direction of the slider, and a fixing screw for fixing the slider is provided in the slider through hole, and the fixing screw is threadedly connected to the bottom of the slide groove.

[0007] Preferably, a step extending around the inner wall of each slider through hole is provided at the lower portion of the inner wall.

[0008] Preferably, each of the slide grooves is provided with a strip-shaped groove at the bottom, each of the grooves is located directly below the corresponding slider through hole, each of the grooves extends in the same direction as the corresponding slider through hole, each of the grooves is provided with a threaded hole for connecting a fixing screw at the bottom, and each of the sliders has an extension portion extending from the bottom end that slides in the corresponding groove, and the slider through hole passes through the extension portion.

[0009] Preferably, one end of each of the sliders away from the branch channel is threadedly connected with an anti-retraction screw for preventing the slider from retreating in a direction away from the branch channel.

[0010] Preferably, a gap between a side wall of each sliding groove along the sliding direction of the slider and a corresponding side wall of the slider is no greater than 0.01 mm.

[0011] Preferably, the opposite end faces on the two sliders are both inclined surfaces, the flow branch channel is a trapezoidal flow channel, and the inclined surfaces on the two sliders correspond to and are parallel to the two side walls of the flow branch channel.

[0012] Preferably, the lengths of the two sliders in the sliding direction are different.

[0013] The beneficial effects of the utility model are as follows: by moving the two sliders to the same distance toward the center of the flow channel, or by moving the two sliders to the two sides of the branch flow channel, the size of the flow channel can be changed, and the balance of filling of the flow channel system can be improved. There is no additional groove to increase the clamping force of the plastic in the flow channel, and the plastic in the flow channel is easy to demold. After the size between the two sliders is reduced, there will be no extra space for filling plastic, which saves plastic materials and better guarantees the production quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0015] Figure 2 This utility model embodiment Figure 1 A magnified schematic diagram of the middle A area;

[0016] Figure 3 This is a schematic diagram of the structure of the injection mold body of the utility model embodiment;

[0017] Figure 4 It is a schematic diagram of the structure of a slider in an embodiment of the utility model.

[0018] Figure numerals: 1 injection mold body, 2 branch channel, 3 slide groove, 4 slider, 40 first slider, 400 first slider through hole, 401 first fixing screw, 402 first anti-retraction screw, 41 second slider, 410 second slider through hole, 411 second fixing screw, 412 second anti-retraction screw. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the following will be clearly and completely described in combination with the technical solution in the embodiments of the utility model. Obviously, the described embodiments are partial embodiments of the utility model, rather than all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model. In addition, the directional terms mentioned in the utility model, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc., are only referenced to the directions of the attached diagrams. The directional terms used are for better and clearer explanation and understanding of the utility model, rather than indicating or implying the orientation that the utility model must have, and therefore cannot be understood as a limitation on the utility model.

[0020] The utility model is implemented as follows Figures 1 to 4As shown in, a structure for improving the balance of flow channel filling includes an injection mold body 1, for example, a branch channel 2 of the injection mold body 1 includes a first branch channel extending in the front-to-back direction branched from the main channel and two second branch channels correspondingly located on both sides of the first branch channel, and the two second branch channels are symmetrical with the first branch channel as the center line. The first branch channel and the two second branch channels can be provided with a structure for improving the balance of flow channel filling. In this embodiment, the first branch channel is provided with a structure for improving the balance of flow channel filling, and two opposite chutes 3 are correspondingly provided on the left and right sides of the front end of the first branch channel on the injection mold body 1, and a chute notch connecting the first branch channel is provided at opposite ends of the two chutes 3, and the extension direction of the two chutes 3 is perpendicular to the extension direction of the first branch channel, that is, the two chutes 3 extend in the left and right directions, and the two chutes The bottom of the groove 3 is coplanar with the bottom end of the first branch channel, and sliders 4 are provided in the two slide grooves 3 to limit the sliding movement. The width of each slider 4 matches the width of the corresponding slide groove 3. The gap between the side wall of each slide groove 3 along the sliding direction of the slider 4 and the side wall of the corresponding slider 4 is not greater than 0.01mm. Each slider 4 extends out of or retracts the corresponding slide groove 3 through the corresponding slide groove notch. The two sliders 4 are respectively the first slider 40 and the second slider 41, that is, the first slider 40 is limitedly slid in the slide groove 3 on the left side of the first flow channel, and the second slider 41 is limitedly slid in the slide groove 3 on the right side of the first flow channel. The length of the first slider 40 in the left-right direction is greater than the length of the second slider 41 in the left-right direction. Each slider 4 is provided with a waist-shaped slider through hole; a fixing screw for fixing the slider is provided in the slider through hole;The fixing screw is threadedly connected to the bottom of the groove of the slide groove 3, that is, the first slider 40 is provided with a first slider through hole 400 in the left and right direction, and the second slider 41 is provided with a second slider through hole 410 in the left and right direction. The first slider through hole 400 is provided with a first fixing screw 401 for fixing the first slider 40, and the second slider through hole 410 is provided with a second fixing screw 411 for fixing the second slider 41. The first fixing screw 401 and the second fixing screw 411 are both cup head screws, and the lower part of the inner side wall of each slider through hole extends a step around its inner side wall, that is, the inner side wall of the first slider through hole 400 is provided with a first fixing screw 401 for fixing the first slider 40, and the second fixing screw 411 is provided with a second fixing screw 411 for fixing the second slider 41. The first fixing screw 401 and the second fixing screw 411 are both cup head screws. The lower part of the inner side wall of each slider through hole extends a step around its inner side wall, that is, the inner side wall of the first slider through hole 400 is provided with a first fixing screw 401 for fixing the first slider 40. A first step extends from the lower part of the side wall, and a second step extends from the lower part of the inner wall of the second slider through hole 410, so that the first fixing screw 401 and the second fixing screw 411 will not interfere with other parts on the mold when they are located in the corresponding first slider through hole 400 and the second slider through hole 410, and there is no need to open a avoidance hole on the mold to avoid the first fixing screw 401 and the second fixing screw 411. The first fixing screw 401 and the second fixing screw 411 are both threadedly connected to the bottom of the slide groove 3, and a strip-shaped groove in the left and right direction is provided at the bottom of each slide groove 3 away from the diverter 2, and the bottom of each groove is A threaded hole for connecting a fixing screw is provided, each of the threaded holes is located on the side of the bottom of the corresponding groove close to the first diverter, and the bottom end of each slider 4 extends an extension portion sliding in the corresponding groove, and the slider through hole passes through the extension portion, that is, a first groove is provided on the left side of the bottom of the slide groove 3 on the left, and a first threaded hole for connecting a first fixing screw 401 is provided at the bottom of the first groove, and a second groove is provided on the right side of the bottom of the slide groove 3 on the right, and a second threaded hole for connecting a second fixing screw 411 is provided at the bottom of the second groove, and the left side of the bottom end of the first slider 40 extends out of the first groove. The second extension part 41 extends from the right side of the bottom end of the second slider 41 to slide in the second groove. When the size of the first branch flow channel needs to be adjusted to balance the flow channel system, the first fixing screw 401 and the second fixing screw 411 are loosened, and then the first slider 40 and the second slider 41 are moved to the center of the first flow channel, or the first slider 40 and the second slider 41 in the first flow channel are moved to both sides of the first flow channel, and then the first fixing screw 401 and the second fixing screw 411 are tightened to limit and fix the first slider 40 and the second slider 41, and the size adjustment of the first branch flow channel is completed, so that the flow channel system is filled and balanced, which is very convenient. ;

[0021] Further improvements, such as Figure 2 and Figure 4As shown in, one end of each of the sliders 4 away from the branch channel 2 is threadedly connected with an anti-retreat screw for preventing the slider 4 from retreating in the direction away from the branch channel 2, that is, the left end of the first slider 40 is provided with a first anti-retreat screw 402 preventing the first slider 40 from retreating to the left side, and the right end of the second slider 41 is provided with a second anti-retreat screw 412 preventing the second slider 41 from retreating to the right side. The first anti-retreat screw 402 and the second anti-retreat screw 412 are rotated to make the first anti-retreat screw 402 and the second anti-retreat screw 412 abut against the left and right groove walls corresponding to the slide groove 3, effectively preventing the first slider 40 and the second slider 41 from being pushed back by the pressure of the sol in the first branch channel during injection molding. The first anti-retreat screw 402 and the second anti-retreat screw 412 are both headless screws, and the headless screws occupy less space in the slide groove 3, making the slider 4 and the slide groove 3 more compact, saving mold space.

[0022] Further improvements, such as Figure 1 and Figure 2 As shown in the figure, the opposite end faces of the first slider 40 and the second slider 41 are both inclined surfaces, the first branch channel is a trapezoidal channel, and the opposite end faces of the first slider 40 and the second slider 41 are parallel to the two side walls of the first branch channel, that is, the right end face of the first slider 40 is parallel to the left side wall of the first branch channel, and the left end face of the second slider 41 is parallel to the right side wall of the first branch channel. The slider 4 has the same demoulding slope as the first branch channel, which will not increase the clamping force of the plastic in the first branch channel, thereby avoiding the difficulty of demoulding the plastic in the branch channel 2.

[0023] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the utility model.

Claims

1. A structure for improving flow channel filling balance, comprising an injection mold body; characterized in that: Two opposite slide grooves are correspondingly arranged on both sides of the branch channel on the injection mold body; a slide groove notch connecting the branch channel is arranged at the opposite ends of the two slide grooves; a slider is provided in the two slide grooves for limiting sliding; the width of each slider matches the width of its corresponding slide groove; each slider extends out of or retracts into the corresponding slide groove through the corresponding slide groove notch.

2. A structure for improving flow channel filling balance according to claim 1, characterized in that: Each of the sliders is provided with a waist-shaped slider through hole extending along the sliding direction of the slider; a fixing screw for fixing the slider is provided in the slider through hole; and the fixing screw is threadedly connected to the bottom of the slide groove.

3. A structure for improving flow channel filling balance according to claim 2, characterized in that: A step extending around the inner side wall of each slider through hole is formed at the lower part of the inner side wall.

4. A structure for improving flow channel filling balance according to claim 2, characterized in that: The bottom of each slide groove is provided with a strip-shaped groove; each groove is located directly below the corresponding slider through hole; each groove extends in the same direction as the corresponding slider through hole; the bottom of each groove is provided with a threaded hole for connecting a fixing screw; the bottom end of each slider extends an extension portion that slides in the corresponding groove; the slider through hole passes through the extension portion.

5. The structure for improving flow channel filling balance according to claim 1, characterized in that: One end of each of the sliding blocks away from the flow diversion channel is threadedly connected with an anti-retraction screw for preventing the sliding block from retreating in a direction away from the flow diversion channel.

6. The structure for improving flow channel filling balance according to claim 1, characterized in that: The gap between the side wall of each sliding groove along the sliding direction of the slider and the corresponding side wall of the slider is no more than 0.01 mm.

7. The structure for improving flow channel filling balance according to claim 1, characterized in that: The flow branch channel is a trapezoidal flow channel; the opposite end faces on the two sliders are both inclined surfaces; the inclined surfaces on the two sliders correspond to and are parallel to the two side walls of the flow branch channel.

8. The structure for improving flow channel filling balance according to claim 1, characterized in that: The lengths of the two sliding blocks in the sliding direction are different.

Images