Mold for verifying sealing performance of non-return ring of injection molding machine

Abstract

The utility model provides a mold for verifying the sealing performance of a non-return ring of an injection molding machine, and belongs to the technical field of testing devices. The problem that the sealing reliability of the non-return ring cannot be judged in the prior art is solved. The mold for verifying the sealing performance of the non-return ring of the injection molding machine comprises a fixed mold and a movable mold with a pouring inlet, and the fixed mold is provided with a block-shaped filling groove and a long-strip-shaped pressure maintaining groove which are arranged in a concave mode. The fixed mold is further provided with a first exhaust groove and a second exhaust groove which penetrate through the side wall and are communicated with the filling groove and the pressure maintaining groove respectively, the filling groove is communicated with the pouring inlet and the pressure maintaining groove, and the filling groove and the pressure maintaining groove are distributed in a T shape. Therefore, the problem that the sealing reliability of the non-return ring cannot be judged is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to test device technical field relates to a kind of mould for verifying injection molding machine check ring sealing performance. BACKGROUND

[0002] Check ring is the movable component of the screw head of injection molding machine, and the function of check ring of injection molding machine is to control the flow of material and avoid the backflow of molten material at the front end of screw. First, at the beginning of injection cycle, when the thermoplastic melt is injected into the mold cavity, the check ring is closed to avoid the backflow of molten material at the front end. Secondly, when the screw retreats and the polymer has been plasticized and is ready for the next injection, the check ring is opened to provide a channel for the polymer. When the screw rotates and plasticizes, the molten material transported to the screw head by the screw groove has a certain pressure, which pushes the check ring forward. During injection, the screw moves forward to apply pressure to the molten material at the front end, while the check ring moves backward under the pressure of the molten material at the front end. The closed sealing of check ring avoids the backflow of molten material at the front end of screw head, and the opening and closing ability of check ring directly affects the quality of products.

[0003] Check ring controls the opening and closing of the channel by moving forward and backward. During the movement, check ring may wear out, resulting in poor sealing, causing melt backflow, affecting product quality, and causing defective products. However, there is currently no good test device to determine whether check ring is failed. SUMMARY

[0004] The utility model aims at the above-mentioned problems existing in the prior art and proposes a kind of mould for verifying injection molding machine check ring sealing performance. The technical problem to be solved by the utility model is to solve the problem of unable to judge the sealing reliability of check ring.

[0005] The purpose of the utility model can be realized by the following technical solutions:

[0006] A kind of mould for verifying injection molding machine check ring sealing performance, including fixed mould and movable mould with gate, characterized by, the fixed mould is provided with respectively recessed block-shaped filling groove and long strip-shaped pressure maintaining groove, the fixed mould is further provided with first exhaust groove and second exhaust groove, which penetrate through side wall and are respectively communicated with the filling groove and the pressure maintaining groove, the filling groove is respectively communicated with the gate and the pressure maintaining groove, and the filling groove and pressure maintaining groove are arranged in "T" shape.

[0007] In use, the block-shaped filling groove on the fixed mold and the block-shaped filling cavity between the movable mold form a block-shaped filling cavity, and the long strip-shaped pressure maintaining groove on the fixed mold and the long strip-shaped pressure maintaining cavity between the movable mold form a long strip-shaped pressure maintaining cavity. The injection molding machine injects melt into the sprue to simulate the injection molding process. In the filling cavity, the pressure required to overcome the melt backflow is greater than the pressure required to overcome the flow to the pressure maintaining cavity, so the melt will preferentially enter the pressure maintaining cavity. In the long strip-shaped pressure maintaining cavity, the pressure required to overcome the melt backflow is less than the pressure required to overcome the further flow to the pressure maintaining cavity, so the melt will preferentially backflow. If the resistance of the melt to further flow in the pressure maintaining cavity is greater than the resistance of the melt to backflow to the gap between the non-return ring and the screw, then backflow will immediately occur. After backflow, the melt will not further flow in the pressure maintaining cavity, so the length of the melt in the pressure maintaining cavity can be used to determine the sealing performance of the non-return ring. The first exhaust groove and the second exhaust groove can reduce the influence of exhaust resistance on the test results, ensure the accuracy of the test results, and thus solve the problem of being unable to determine the sealing reliability of the non-return ring.

[0008] Specifically, the smaller the length of the melt in the pressure maintaining cavity, the less melt enters the pressure maintaining cavity, the earlier the melt backflow, and the more severe the wear of the non-return ring. The larger the length of the melt in the pressure maintaining cavity, the more melt enters the pressure maintaining cavity, the later the melt backflow, and the less severe the wear of the non-return ring. Thus, the sealing reliability of the non-return ring can be determined by the mold, and the user can replace unqualified non-return rings in advance to avoid the occurrence of defective products.

[0009] In the mold for verifying the sealing performance of the non-return ring of the injection molding machine, the depth of the filling groove is 2-3 mm, and the depth of the pressure maintaining groove is 1-3 mm. The test accuracy is ensured while reducing the time required for the test.

[0010] In the mold for verifying the sealing performance of the non-return ring of the injection molding machine, the pressure maintaining groove is a long strip-shaped rectangle, the fixed mold has a scale mark arranged along the length direction of the pressure maintaining groove, and the scale mark is located on the edge of one side of the pressure maintaining groove. The length of the melt entering the pressure maintaining groove during the test can be more intuitively observed, so the sealing performance of the non-return ring can be determined by the value of the scale mark.

[0011] In the mold for verifying the sealing performance of the non-return ring of the injection molding machine, the depth of the first exhaust groove on at least one side communicating with the filling groove is less than the depth of the filling groove, and the depth of the second exhaust groove on at least one side communicating with the pressure maintaining groove is less than the depth of the pressure maintaining groove. While exhausting, the melt is prevented from entering the first exhaust groove or the second exhaust groove.

[0012] In the mold for verifying sealing performance of the check ring of the injection molding machine, the first exhaust groove comprises a first air inlet section, a first communication section and a first exhaust section arranged in sequence, and depths of the three sections increase in sequence; the second exhaust groove comprises a second air inlet section, a second communication section and a second exhaust section arranged in sequence, and depths of the three sections increase in sequence. On the one hand, the melt can avoid entering the first exhaust groove or the second exhaust groove, and on the other hand, the narrow tube effect can be formed to better promote the gas in the mold to flow to the outside of the mold through the first exhaust groove or the second exhaust groove, so that the influence of the exhaust resistance on the test result can be reduced, thereby ensuring the accuracy of the test result.

[0013] In the mold for verifying sealing performance of the check ring of the injection molding machine, the first air inlet section is in a capillary tube shape and has a plurality of first air inlet sections, the first exhaust groove has two first exhaust grooves and is symmetrically arranged on both sides of the filling groove, the second air inlet section is in a capillary tube shape and has a plurality of second air inlet sections, and the second exhaust groove has two second exhaust grooves and is symmetrically arranged on both sides of the holding groove. The first air inlet section is in a capillary tube shape and has a plurality of first air inlet sections, and the second air inlet section is in a capillary tube shape and has a plurality of second air inlet sections, so that the melt can avoid entering the first exhaust groove and the second exhaust groove, the influence of the exhaust resistance on the test result can be better reduced, and the accuracy of the test result can be better ensured.

[0014] In the mold for verifying sealing performance of the check ring of the injection molding machine, the fixed mold further has a third exhaust groove penetrating through the side wall and communicating with the holding groove, the third exhaust groove is connected to an end of the holding groove away from the filling groove, the third exhaust groove comprises a third air inlet section and a third exhaust section arranged in sequence and having depths increasing in sequence, and the third air inlet section is in a capillary tube shape and has a plurality of third air inlet sections. By additionally arranging the third exhaust groove, uniform exhaust along the circumference of the mold can be realized by cooperation of the third exhaust groove, the first exhaust groove and the second exhaust groove, so that the influence of the exhaust resistance on the test result can be reduced to the minimum, and the test result can be more accurate.

[0015] In the mold for verifying sealing performance of the check ring of the injection molding machine, the fixed mold is connected to a mold temperature controller with a flow meter through a water pipe. By arranging the mold temperature controller, the test temperature of the fixed mold can be consistent in each test, so that the accuracy and repeatability of the verification result can be ensured.

[0016] Compared with the prior art, the mold for verifying sealing performance of the check ring of the injection molding machine has the advantages that when the mold is connected to the injection molding machine, the injection molding process can be simulated and the sealing reliability of the check ring can be judged, so that the seriously worn unqualified check ring can be replaced in advance, the appearance of defective products can be avoided, and the problem that the sealing reliability of the check ring cannot be judged can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is a three-dimensional structural schematic diagram of the mold for verifying the sealing performance of the check ring of the injection molding machine.

[0018] Fig. 2 is a three-dimensional structural schematic diagram of the mold for verifying the sealing performance of the check ring of the injection molding machine after the moving of the movable mold.

[0019] Fig. 3 is a three-dimensional structural schematic diagram of the fixed mold of the mold for verifying the sealing performance of the check ring of the injection molding machine.

[0020] Fig. 4 is a top view structural schematic diagram of the fixed mold of the mold for verifying the sealing performance of the check ring of the injection molding machine.

[0021] Fig. 5 is a sectional view of the mold for verifying the sealing performance of the check ring of the injection molding machine in use.

[0022] Fig. 6 is a three-dimensional structural schematic diagram of the mold for verifying the sealing performance of the check ring of the injection molding machine connected with the mold temperature machine.

[0023] In the figure, 1 is the fixed mold; 1a is the filling groove; 1b is the pressure maintaining groove; 1c is the first exhaust groove; 1c1 is the first air inlet section; 1c2 is the first communication section; 1c3 is the first exhaust section; 1d is the second exhaust groove; 1d1 is the second air inlet section; 1d2 is the second communication section; 1d3 is the second exhaust section; 1e is the third exhaust groove; 1e1 is the third air inlet section; 1e2 is the third exhaust section; 1f is the water channel; 2 is the movable mold; 2a is the injection gate; 3 is the mold temperature machine; 3a is the flow meter; 4 is the injection molding machine; 4a is the screw rod; and 5 is the check ring. DETAILED DESCRIPTION

[0024] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0025] A mold for verifying the sealing performance of the check ring of the injection molding machine, referring to Figs. 1-6 , comprises a fixed mold 1 and a movable mold 2 with an injection gate 2a, the fixed mold 1 is provided with a block-shaped filling groove 1a and a long strip-shaped pressure maintaining groove 1b which are recessed respectively, the fixed mold 1 is further provided with a first exhaust groove 1c and a second exhaust groove 1d which penetrate through the side wall and communicate with the filling groove 1a and the pressure maintaining groove 1b respectively, the filling groove 1a communicates with the injection gate 2a and the pressure maintaining groove 1b respectively, and the filling groove 1a and the pressure maintaining groove 1b are arranged in a "T" shape.

[0026] Specifically, referring to Figs. 1-6, the depth of the filling groove 1a is 2-3mm, the depth of the pressure maintaining groove 1b is 1-3mm; the pressure maintaining groove 1b is long strip rectangular shape, the fixed mold 1 has scale marks arranged along the length direction of the pressure maintaining groove 1b, and the scale marks are located on the edge of one side of the pressure maintaining groove 1b; the fixed mold 1 is connected with the mold temperature controller 3 with flow meter 3a through water pipe.

[0027] More specifically, referring to Figs. 1-6 , the depth of the first exhaust groove 1c at least on the side communicating with the filling groove 1a is less than the depth of the filling groove 1a, and the depth of the second exhaust groove 1d at least on the side communicating with the pressure maintaining groove 1b is less than the depth of the pressure maintaining groove 1b; the first exhaust groove 1c comprises first air inlet section 1c1, first communication section 1c2 and first exhaust section 1c3 arranged in sequence, and the depth of the three sections increases in sequence; the second exhaust groove 1d comprises second air inlet section 1d1, second communication section 1d2 and second exhaust section 1d3 arranged in sequence, and the depth of the three sections increases in sequence.

[0028] More specifically, referring to Figs. 1-6 , the first air inlet section 1c1 is capillary tube shape and has multiple, the first exhaust groove 1c has two and is symmetrically arranged on both sides of the filling groove 1a, the second air inlet section 1d1 is capillary tube shape and has multiple, and the second exhaust groove 1d has two and is symmetrically arranged on both sides of the pressure maintaining groove 1b; the fixed mold 1 further has third exhaust groove 1e penetrating the side wall and communicating with the pressure maintaining groove 1b, the third exhaust groove 1e is connected on the end of the pressure maintaining groove 1b away from the filling groove 1a, the third exhaust groove 1e comprises third air inlet section 1e1 and third exhaust section 1e2 arranged in sequence and increasing in depth in sequence, and the third air inlet section 1e1 is capillary tube shape and has multiple.

[0029] The working principle of the mold for verifying the sealing performance of the injection molding machine check ring is set forth below: in use, the movable mold 2 and the fixed mold 1 are closed, the injection molding machine is connected with the injection port 2a of the movable mold 2, the block-shaped filling groove 1a on the fixed mold 1 and the movable mold 2 form a block-shaped filling cavity, the long strip-shaped pressure maintaining groove 1b on the fixed mold 1 and the movable mold 2 form a long strip-shaped pressure maintaining cavity, and the water channel 1f on the fixed mold 1 is connected with the mold temperature controller 3 with flow meter 3a; by setting the mold temperature controller 3, the test temperature of the fixed mold 1 can be consistent each time, thereby ensuring the accuracy and repeatability of the verification results; meanwhile, the setting of the first exhaust groove 1c, the second exhaust groove 1d and the third exhaust groove 1e can realize uniform exhaust along the circumference of the mold, thereby reducing the influence of exhaust resistance on the test results to the minimum, and further making the test results more accurate.

[0030] The injection molding machine injects the melt into the sprue 2a to simulate the injection molding process, the melt first enters the block-shaped filling cavity, the wide filling cavity allows the pressure to increase slowly when the melt enters the area, preventing high speed and pressure from causing the melt to burn, and then the melt enters the long strip-shaped holding cavity, in the filling cavity, the pressure required to overcome the melt backflow is greater than the pressure required to flow to the holding cavity, so the melt will preferentially enter the holding cavity, and in the long strip-shaped holding cavity, the pressure required to overcome the melt backflow is less than the pressure required to further flow to the holding cavity, so the melt will preferentially backflow, that is, if the resistance of the melt to further flow in the holding cavity is greater than the resistance of the melt to backflow to the gap between the non-return ring and the screw, then backflow will immediately occur, and after backflow, the melt will not further flow in the holding cavity, so that the value of the scale mark (not shown in the figure) corresponding to the melt along the length direction of the holding groove 1b will no longer increase, so that the value of the scale mark can be used to judge the sealing performance of the non-return ring, specifically, if the value of the scale mark is smaller, it means that less melt enters the holding cavity, the melt backflows earlier, and the non-return ring wears more severely, if the value of the scale mark is larger, it means that more melt enters the holding cavity, the melt backflows later, and the non-return ring wears less severely. The mold can be used to judge the sealing reliability of the non-return ring, so that unqualified non-return rings can be replaced in advance, and the appearance of defective products can be avoided.

[0031] The specific embodiments described herein are merely illustrative 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 use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A mold for verifying the sealing performance of a non-return ring of an injection molding machine, comprising a fixed mold (1) and a movable mold (2) having a sprue (2a), characterized in that, The fixed mold (1) has a block-shaped filling groove (1a) and a long strip-shaped pressure maintaining groove (1b) recessed respectively, and further has a first exhaust groove (1c) and a second exhaust groove (1d) penetrating the side wall and communicating with the filling groove (1a) and the pressure maintaining groove (1b) respectively, the filling groove (1a) communicates with the pouring gate (2a) and the pressure maintaining groove (1b) respectively, and the filling groove (1a) and the pressure maintaining groove (1b) are arranged in a "T" shape.

2. A mold for verifying the sealing performance of a non-return ring of an injection molding machine according to claim 1, characterized in that, The depth of the filling groove (1a) is 2-3 mm, and the depth of the pressure maintaining groove (1b) is 1-3 mm.

3. A mold for verifying the sealing performance of a non-return ring of an injection molding machine according to claim 1 or 2, characterized in that, The pressure maintaining groove (1b) is a long strip-shaped rectangle, the fixed mold (1) has a scale mark arranged along the length direction of the pressure maintaining groove (1b), and the scale mark is located on the edge of one side of the pressure maintaining groove (1b).

4. The mold for verifying the sealing performance of a check ring of an injection molding machine according to claim 1 or 2, characterized in that, The depth of the first exhaust groove (1c) on at least one side communicating with the filling groove (1a) is less than the depth of the filling groove (1a), and the depth of the second exhaust groove (1d) on at least one side communicating with the pressure maintaining groove (1b) is less than the depth of the pressure maintaining groove (1b).

5. A mold for verifying the sealing performance of a non-return ring of an injection molding machine according to claim 4, characterized in that, The first exhaust groove (1c) comprises a first air inlet section (1c1), a first communication section (1c2) and a first exhaust section (1c3) arranged in sequence, and the depths of the three sections increase in sequence; the second exhaust groove (1d) comprises a second air inlet section (1d1), a second communication section (1d2) and a second exhaust section (1d3) arranged in sequence, and the depths of the three sections increase in sequence.

6. A mold for verifying the sealing performance of a check ring of an injection molding machine according to claim 5, characterized in that, The first air inlet section (1c1) is in a capillary tube shape and has a plurality of, the first exhaust groove (1c) has two and is symmetrically arranged on both sides of the filling groove (1a), the second air inlet section (1d1) is in a capillary tube shape and has a plurality of, and the second exhaust groove (1d) has two and is symmetrically arranged on both sides of the pressure maintaining groove (1b).

7. A mold for verifying the sealing performance of a non-return ring of an injection molding machine according to claim 6, characterized in that, The fixed mold (1) further has a third exhaust groove (1e) penetrating the side wall and communicating with the pressure maintaining groove (1b), the third exhaust groove (1e) is connected to the end of the pressure maintaining groove (1b) away from the filling groove (1a), the third exhaust groove (1e) comprises a third air inlet section (1e1) and a third exhaust section (1e2) arranged in sequence and increasing in depth in sequence, and the third air inlet section (1e1) is in a capillary tube shape and has a plurality of.

8. The mold for verifying the sealing performance of a check ring of an injection molding machine according to claim 1 or 2, wherein The fixed mold (1) is connected with a mold temperature controller (3) with a flow meter (3a) through a water pipe.

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