Injection mold pressure testing device

Abstract

The utility model discloses an injection mold pressure testing arrangement belongs to injection mold detection technical field. Including the connecting pipe, the one end of connecting pipe has the cut -off valve, the other end of connecting pipe has the injection piece, and the one end of injection piece is used for and the injection mouth of injection mold is connected, and the lateral surface of connecting pipe is connected with the detection cover, and the top surface of detection cover is installed with the holder, and the inside vertical sliding of holder has the sliding block, and the surface of holder is equipped with the scale, and the inner top surface elasticity of sliding block and holder is connected, and the top surface of detection cover still is installed with the fixed block, and the inside rotation of fixed block is connected with the pivot, and the outside coaxial line of pivot is connected with the turntable, and the outside of turntable is wound with the guy wire, and the inside sliding of detection cover has the disc body, and one end of guy wire and the back of disc body are connected, and the other end of guy wire and the bottom surface of sliding block are connected.

Description

Technical Field

[0001] This utility model relates to the field of injection mold testing technology, specifically to an injection mold pressure testing device. Background Technology

[0002] In injection molding, the sealing performance of the mold after mold closing is a critical prerequisite for ensuring the quality of plastic parts and production safety. If there is a leak in the mold, the molten material will overflow from the leak point during high-pressure injection, which will not only lead to defects such as insufficient material and flash in the plastic parts, but may also cause local overheating of the mold and corrosion of components due to molten material leakage, shortening the mold's service life. In more serious cases, the leakage of high-temperature molten material may burn operators, posing a significant safety hazard. Therefore, verifying the sealing performance of the mold after mold closing through pressure testing has become an indispensable step before injection molding production.

[0003] The current mainstream mold leakage pressure detection logic determines whether there is a leak by simulating the cavity pressure environment during injection molding: that is, a fluid at a specific pressure is injected into the mold cavity after the mold is closed. If the cavity can stably maintain the preset pressure, the sealing performance is considered qualified; if the pressure continuously drops, it indicates a leak, and further investigation of the leak location is required. This detection method can directly reflect the sealing status of the mold after mold closure, avoiding batch production defects or safety accidents caused by leaks.

[0004] However, most existing injection molds do not integrate built-in pressure detection functions, forcing users to rely on external pressure testing instruments for leak detection. This approach has several drawbacks: Firstly, existing pressure testing instruments are mostly general-purpose devices requiring independent pressure sensors. However, the cavity sizes and structures of different molds vary greatly, making it difficult to find suitable installation locations for general-purpose sensors. If the sensor is too large, it cannot be embedded in small cavities; if the sensor is too short, it cannot reach the bottom of deep cavities, resulting in blind spots in pressure detection and overlooking potential local leaks. Secondly, external testing instruments require shielded cables to connect the sensor, signal amplifier, and data acquisition equipment. These cables must be laid along the mold seams, making the wiring process cumbersome and prone to sensor displacement due to cable pulling. Thirdly, the analysis of test data requires professional personnel, which is difficult for ordinary operators to master quickly, leading to low testing efficiency and failing to meet the rapid testing needs of batch molds.

[0005] In summary, existing injection molds lack built-in pressure detection capabilities, necessitating reliance on external instruments and sensors for leak detection. This results in cumbersome, costly, and inefficient testing operations, and carries the risk of damaging mold precision. As the injection molding industry demands higher quality and production efficiency for plastic parts, there is an urgent need to design a highly integrated, easy-to-operate injection mold pressure testing device that requires no secondary mold processing, fundamentally addressing the pain points of existing testing methods. Utility Model Content

[0006] The purpose of this invention is to provide an injection mold pressure testing device to solve the problems mentioned in the background art.

[0007] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0008] A pressure testing device for injection molds includes a connecting pipe, one end of which is connected to a shut-off valve, and the other end of which is connected to an injection component. One end of the injection component is used to connect to the injection port of the injection mold. A detection sleeve is connected to the side of the connecting pipe. A retainer is mounted on the top surface of the detection sleeve. A slider slides vertically inside the retainer. Scales are provided on both sides of the retainer. The slider and the inner top surface of the retainer are elastically connected. A fixing block is also mounted on the top surface of the detection sleeve. A rotating shaft is rotatably connected inside the fixing block, and the outer side of the rotating shaft is coaxially connected to... A turntable is connected to the device, with a pull wire wound around its outer side. A disc body slides inside the detection sleeve. One end of the pull wire is connected to the back of the disc body, and the other end is connected to the bottom surface of the slider. Connecting pipes are connected to a shut-off valve, an injection component, and the detection sleeve, providing a channel for fluid flow. The injection component is connected to the injection port of the injection mold, enabling docking between the device and the mold. The disc body inside the detection sleeve is slidable and connected to a slider inside a retainer via the pull wire. The slider is elastically connected to the top surface inside the retainer, which has graduations. A rotating shaft inside a fixed block drives the turntable to rotate, adjusting the length of the pull wire. Through the cooperation of these components, changes in mold cavity pressure can be converted into changes in slider position. The pressure status is visually displayed using graduations, eliminating the need for an external pressure sensor. This avoids the problem of universal sensors being difficult to adapt to due to differences in mold cavity size and structure, enabling convenient detection of mold sealing and reducing the difficulty of detection operations while improving detection adaptability.

[0009] Furthermore, a first connector is installed at the center of the top surface of the slider, and a hanging ring is installed at the top of the first connector. A spring is installed at the inner top of the retainer, and a second connector is installed at the free end of the spring. A hook is installed at the bottom of the second connector. The hook and the hanging ring engage. The slider is connected to the hanging ring via the first connector, and the spring at the top of the retainer is connected to the hook via the second connector. The hook and the hanging ring engage to connect the slider and the spring. This detachable connection method facilitates replacement when the spring ages or loses elasticity. It also allows for the replacement of springs with different elastic coefficients according to different detection pressure requirements, ensuring that the slider can slide accurately within the corresponding pressure range, thereby guaranteeing the accuracy of pressure detection and improving the flexibility and detection precision of the device.

[0010] Furthermore, a pair of limiting blocks are installed on the side of the disc, and a limiting groove is formed on the inner wall of the detection sleeve. The limiting blocks slide within the limiting groove. The limiting blocks on the side of the disc cooperate with the limiting groove on the inner wall of the detection sleeve. When the disc slides under fluid pressure within the detection sleeve, the limiting blocks can only move along the trajectory of the limiting groove. This effectively restricts the sliding direction of the disc, preventing the disc from shifting, tilting, or rotating during the sliding process. This ensures that the disc always maintains stable linear sliding, thereby guaranteeing the stability of the pull wire and avoiding inaccurate sliding of the slider due to disc position deviation, thus achieving the purpose of improving the stability and accuracy of pressure detection.

[0011] Furthermore, a first groove is formed on the top surface of the fixing block, and a second groove is formed at the connection between the fixing block and the detection sleeve. The two ends of the pull wire pass through the first and second grooves respectively. The first groove on the top surface of the fixing block and the second groove at the connection between the fixing block and the detection sleeve guide and restrict the direction of the pull wire. After the two ends of the pull wire pass through the first and second grooves respectively, it can prevent the pull wire from deviating, tangling, or rubbing against other components during pulling, ensuring that the pull wire always transmits tension along a fixed trajectory, reducing wear on the pull wire, extending its service life, and ensuring the stability and accuracy of tension transmission. This avoids inaccurate sliding of the slider due to abnormal pull wire position, thereby improving the operational stability of the device and extending the service life of the components.

[0012] Furthermore, one end of the rotating shaft is located outside the fixed block, and the detection sleeve is made of transparent material. The rotating shaft is located outside the fixed block, which makes it convenient for the operator to rotate the rotating shaft outside the device, thereby driving the turntable to wind the pull line that has been lengthened after the last use. This facilitates the calibration of the initial position of the disc before testing, ensuring the accuracy of the test. The detection sleeve is made of transparent material, so the operator can directly observe the position of the disc inside the detection sleeve.

[0013] Furthermore, the slider has grooves on both sides, and the retainer has both sides located within the grooves. The grooves on both sides of the slider cooperate with the sides of the retainer. When the slider slides within the retainer, the sides of the retainer are always located within the grooves of the slider, which guides the slider's movement and prevents it from shifting left or right or wobbling during the sliding process. This ensures that the slider always slides along the vertical direction of the retainer, so that the position of the slider accurately corresponds to the scale on both sides of the retainer. This avoids scale reading errors caused by slider offset, thereby improving the slider's sliding stability and scale reading accuracy.

[0014] Furthermore, the injection component includes a conical sleeve, one end of which is connected to a connecting pipe, and the other end of which is connected to an injection nozzle. A sealing ring is installed on the surface of the injection nozzle. The conical sleeve in the injection component is connected to the connecting pipe at one end and to the injection nozzle at the other end. The conical structure facilitates the smooth flow of fluid from the connecting pipe to the injection nozzle, reducing fluid flow resistance. The injection nozzle is used to dock with the injection port of the injection mold. The sealing ring on its surface can fill the gap between the injection nozzle and the injection port, enhancing the sealing performance of the connection between the two, preventing fluid leakage from the connection during injection, avoiding inaccurate detection pressure due to leakage, ensuring the reliability of the detection results, and also preventing environmental pollution or component damage caused by fluid leakage. This achieves the purpose of improving the sealing performance of the connection between the device and the mold and the accuracy of detection.

[0015] Furthermore, a flange is installed on the side of the connecting pipe, and a screw is connected between one end of the gate valve and the flange. The flange on the side of the connecting pipe is connected to one end of the gate valve by the screw. The flange can increase the connection area between the connecting pipe and the gate valve, making the connection more stable. The screw connection method facilitates disassembly and installation. When the gate valve malfunctions and needs to be repaired or replaced, the gate valve can be removed from the connecting pipe simply by unscrewing the screw, which is convenient. At the same time, the tight connection between the flange and the gate valve can also enhance the sealing performance, prevent fluid leakage from the connection, and ensure that the gate valve can effectively control the flow of fluid, thereby improving connection stability, facilitating maintenance, and ensuring sealing performance.

[0016] Compared with existing technologies, the beneficial effects of this utility model are as follows: This injection mold pressure testing device achieves convenient docking between the device and the mold through the cooperation of connecting pipe, shut-off valve, and injection component, eliminating the need for secondary processing of the mold and avoiding damage to the mold precision; the cooperation of detection sleeve, disc, pull wire, slider, retainer, and spring converts pressure changes into slider position changes, allowing for intuitive pressure reading through scale, eliminating the need for external pressure sensors and solving the problem of difficult adaptation of general sensors; the cooperation of fixed block, rotating shaft, and turntable facilitates adjustment of pull wire length and calibration of the slider's initial position, simplifying operation, requiring no professional personnel, and improving testing efficiency; the cooperation of components such as limit block and limit groove, first groove and second groove, sealing ring, flange, and screws ensures the sealing and stability of the device, preventing fluid leakage from affecting the test results. Simultaneously, the transparent detection sleeve facilitates observation of the internal state, further enhancing operational convenience. Overall, this device achieves high integration, simple operation, and pressure testing without the need for secondary mold processing, solving the pain points of existing testing methods. Attached Figure Description

[0017] Figure 1 This is a first three-dimensional structural schematic diagram of the injection mold pressure testing device disclosed in an embodiment of the present utility model;

[0018] Figure 2This is an exploded structural diagram of the injection mold pressure testing device disclosed in an embodiment of the present utility model;

[0019] Figure 3 This is a second three-dimensional structural schematic diagram of the injection mold pressure testing device disclosed in an embodiment of this utility model;

[0020] Figure 4 for Figure 3 Enlarged schematic diagram of structure A in the middle;

[0021] Figure 5 This is a cross-sectional structural schematic diagram of the injection mold pressure testing device disclosed in an embodiment of this utility model.

[0022] In the diagram: 1. Gate valve; 2. Connecting pipe; 3. Conical sleeve; 4. Injection nozzle; 5. Sealing ring; 6. Fixing block; 7. Retainer; 8. Screw; 9. Flange; 10. Detection sleeve; 11. Disc; 12. Limiting groove; 13. First groove; 14. First connector; 15. Hanging ring; 16. Second connector; 17. Hook; 18. Spring; 19. Slider; 20. Turntable; 21. Pull wire; 22. Limiting block. Detailed Implementation

[0023] 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.

[0024] Please see Figures 1-5This utility model provides a technical solution: an injection mold pressure testing device, including a connecting pipe 2, one end of which is connected to a shut-off valve 1, and the other end of which is connected to an injection component. One end of the injection component is used to connect to the injection port of the injection mold. A detection sleeve 10 is connected to the side of the connecting pipe 2. A retainer 7 is installed on the top surface of the detection sleeve 10. A slider 19 slides vertically inside the retainer 7. Scales are provided on both sides of the retainer 7. The slider 19 and the inner top surface of the retainer 7 are elastically connected. A fixing block 6 is also installed on the top surface of the detection sleeve 10. A rotating shaft is rotatably connected inside the fixing block 6. A turntable 20 is coaxially connected to the outside of the rotating shaft. A pull wire 21 is wound around the outside of the turntable 20. A disc body 11 slides inside the detection sleeve 10. One end of the pull wire 21 is connected to the back of the disc body 11, and the other end of the pull wire 21 is connected to the bottom surface of the slider 19. The injection component is connected to the injection mold. The injection port of the device is connected to ensure that the device is connected to the mold cavity. Then, the shut-off valve 1 is opened, and the pre-calculated amount of liquid is injected into the mold cavity and the detection sleeve 10 through the connecting pipe 2 until the liquid fills the cavity and the plate 11 is driven by the pull wire 21 to keep the slider 19 stable. Then, the shut-off valve 1 is closed to cut off the liquid injection channel, so that the mold cavity and the detection sleeve 10 form a closed space. If there is no leakage in the mold, the liquid volume in the closed space remains unchanged and the pressure is stable. The plate 11 is balanced by the force, the pull wire 21 remains unchanged, and the slider 19 remains at the initial scale position. If there is leakage in the mold, the amount of liquid inside the cavity decreases and the pressure drops. The liquid pressure in the detection sleeve 10 decreases accordingly. The slider 19 slides under the pull of the elastic component on the top surface of the retainer 7 and deviates from the scale position. By observing the scale on both sides of the retainer 7, it can be determined whether the injection mold is leaking.

[0025] As an embodiment of this utility model, a first connector 14 is installed at the center of the top surface of the slider 19, a hanging ring 15 is installed at the top of the first connector 14, a spring 18 is installed at the inner top of the retainer 7, a second connector 16 is installed at the free end of the spring 18, and a hook 17 is installed at the bottom end of the second connector 16. The hook 17 and the hanging ring 15 are engaged. When it is necessary to assemble the slider 19 and the spring 18, the first connector 14 is first fixedly installed at the center of the top surface of the slider 19, and then the hanging ring 15 is installed at the top of the first connector 14; then the spring 18 is installed at the inner top of the retainer 7, the second connector 16 is fixed at the free end of the spring 18, and then the hook 17 is installed at the bottom end of the second connector 16; finally, the hook 17 and the hanging ring 15 are engaged to complete the connection between the slider 19 and the spring 18. During the testing process, if the mold leaks and the pressure inside the testing sleeve 10 drops, the spring 18 will recover its deformation and generate tension, which is transmitted to the slider 19 through the second connector 16, hook 17, hanging ring 15, and first connector 14, causing the slider 19 to slide within the retainer 7. When the spring 18 needs to be replaced, simply separate the hook 17 from the hanging ring 15, remove the old spring 18, and install the new spring 18 according to the above steps.

[0026] As an embodiment of this utility model, a pair of limiting blocks 22 are further installed on the side of the disc 11, and a limiting groove 12 is opened on the inner wall of the detection sleeve 10. The limiting blocks 22 slide in the limiting groove 12. During device assembly, the limiting blocks 22 are installed on the side of the disc 11, while ensuring that the limiting groove 12 on the inner wall of the detection sleeve 10 corresponds to the position of the limiting blocks 22, so that the limiting blocks 22 can be embedded in the limiting groove 12. When a pre-calculated amount of liquid is injected, the liquid exerts pressure on the disc 11, pushing the disc 11 to slide in the detection sleeve 10. At this time, the limiting blocks 22 slide synchronously along the trajectory of the limiting groove 12. The inner wall of the limiting groove 12 acts as a block for the limiting blocks 22, preventing the disc 11 from shifting radially or rotating, ensuring the stability of the sliding direction of the disc 11, and thus ensuring that the sliding state of the slider 19 can accurately reflect the mold leakage situation.

[0027] As an embodiment of this utility model, the top surface of the fixing block 6 is provided with a first groove 13, and the connection between the fixing block 6 and the detection sleeve 10 is provided with a second groove. The two ends of the pull wire 21 pass through the first groove 13 and the second groove respectively. When assembling the pull wire 21, one end of the pull wire 21 is first fixedly connected to the back of the disc body 11, and then the pull wire 21 at that end passes through the second groove at the connection between the fixing block 6 and the detection sleeve 10. Then the other end of the pull wire 21 is wrapped around the outside of the turntable 20, and then passes through the first groove 13 on the top surface of the fixing block 6 and is fixedly connected to the bottom surface of the slider 19. When adjusting the initial position of the slider, the rotating shaft drives the turntable 20 to rotate, and the pull wire 21 moves in the first groove 13 and the second groove. The groove restricts the offset of the pull wire 21. When injecting a quantitative liquid, the disc body 11 slides and pulls the pull wire 21. The pull wire 21 moves along the groove trajectory and drives the slider 19 to the initial scale. After closing the shut-off valve, if the mold leaks, the disc body 11 slides in the opposite direction, and the pull wire 21 moves in the opposite direction along the groove, driving the slider 19 to slide.

[0028] As an embodiment of this utility model, one end of the rotating shaft is located outside the fixed block 6, and the detection sleeve 10 is made of transparent material. After the last measurement, due to the movement of the turntable 20, some of the pull wires 21 became loose and unwound from the turntable 20. Before this measurement, the operator uses his hand or a tool to rotate one end of the rotating shaft located outside the fixed block 6. The rotating shaft drives the turntable 20 to rotate clockwise, and the turntable 20 gradually wraps the loose pull wires 21 around its outside. During this process, the operator observes the movement of the inner disc 11 through the transparent detection sleeve 10. When the disc 11 no longer moves towards the fixed block 6, it indicates that the pull wires 21 have been tensioned and retracted into place, and the rotating shaft is stopped.

[0029] As an embodiment of the present invention, the slider 19 is provided with grooves on both sides, and the two sides of the retainer 7 are located in the grooves.

[0030] As an embodiment of this utility model, the injection component further includes a conical sleeve 3, one end of which is connected to the connecting pipe 2, and the other end of the conical sleeve 3 is connected to an injection nozzle 4. A sealing ring 5 is installed on the surface of the injection nozzle 4. When the device is connected to the mold, the injection nozzle 4 is inserted into the injection port of the injection mold. The sealing ring 5 on the surface of the injection nozzle 4 is deformed by compression, filling the gap between the injection nozzle 4 and the inner wall of the injection port, thereby achieving a seal. Before this measurement, if it is necessary to retrieve the loose pull wire, rotate the shaft to drive the turntable 20 to wind the pull wire 21. During this process, the sealing ring 5 remains sealed to prevent external impurities from entering or internal liquid from leaking if there is any residue after the last measurement. Then, open the shut-off valve 1, and the pre-calculated amount of liquid flows from the connecting pipe 2 into the conical sleeve 3. The conical channel of the conical sleeve 3 makes the liquid flow cross section gradually transition, reducing flow resistance. The liquid smoothly passes through the conical sleeve 3 into the injection nozzle 4, and then into the mold cavity through the injection nozzle 4 until the liquid fills the cavity and enters the detection sleeve 10, pushing the disc 11 to stabilize the slider 19 at the corresponding scale. After closing the shut-off valve 1, the sealing ring 5 continues to keep sealed, ensuring that the pressure change in the closed space is only determined by whether the mold cavity leaks, and then the leakage of the mold is judged by whether the slider slides.

[0031] As an embodiment of this utility model, a flange 9 is further installed on the side of the connecting pipe 2, and a screw 8 is connected between one end of the stop valve 1 and the flange 9. When installing the stop valve 1, one end of the stop valve 1 is aligned with the flange 9 on the side of the connecting pipe 2 so that the mounting holes of the two correspond one-to-one. The screw 8 is passed through the mounting holes of the stop valve 1 and the flange 9, and the nut is tightened at the other end of the screw 8. The tightening force is generated by the thread engagement between the nut and the screw 8, so that the stop valve 1 and the flange 9 fit tightly together and the fixed connection is completed.

[0032] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a control cabinet. The control circuit can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit connection in detail.

Claims

1. A pressure testing device for injection molds, characterized in that, The system includes a connecting pipe (2), one end of which is connected to a shut-off valve (1), and the other end of which is connected to an injection component. One end of the injection component is used to connect to the injection port of the injection mold. A detection sleeve (10) is connected to the side of the connecting pipe (2). A retainer (7) is installed on the top surface of the detection sleeve (10). A slider (19) slides vertically inside the retainer (7). Scales are provided on both sides of the retainer (7). The slider (19) and the retainer... The inner top surface of the frame (7) is elastically connected, and a fixing block (6) is also installed on the top surface of the detection sleeve (10). The fixing block (6) is rotatably connected to the inside of the fixing block (6). A turntable (20) is coaxially connected to the outside of the turntable (20). A pull wire (21) is wound around the outside of the turntable (20). A disc body (11) slides inside the detection sleeve (10). One end of the pull wire (21) is connected to the back of the disc body (11), and the other end of the pull wire (21) is connected to the bottom surface of the slider (19).

2. The injection mold pressure testing device according to claim 1, characterized in that, A first connector (14) is installed at the center of the top surface of the slider (19). A hanging ring (15) is installed at the top of the first connector (14). A spring (18) is installed at the inner top of the retainer (7). A second connector (16) is installed at the free end of the spring (18). A hook (17) is installed at the bottom end of the second connector (16). The hook (17) and the hanging ring (15) are engaged.

3. The injection mold pressure testing device according to claim 1, characterized in that, A pair of limiting blocks (22) are installed on the side of the disc (11), and a limiting groove (12) is opened on the inner wall of the detection sleeve (10), and the limiting block (22) slides in the limiting groove (12).

4. The injection mold pressure testing device according to claim 1, characterized in that, The top surface of the fixing block (6) is provided with a first groove (13), and the connection between the fixing block (6) and the detection sleeve (10) is provided with a second groove. The two ends of the pull wire (21) pass through the first groove (13) and the second groove respectively.

5. The injection mold pressure testing device according to claim 1, characterized in that, One end of the rotating shaft is located outside the fixed block (6), and the detection sleeve (10) is made of transparent material.

6. The injection mold pressure testing device according to claim 1, characterized in that, The slider (19) has grooves on both sides, and the retainer (7) has grooves on both sides.

7. The injection mold pressure testing device according to claim 1, characterized in that, The injection component includes a conical sleeve (3), one end of which is connected to a connecting pipe (2), and the other end of which is connected to an injection nozzle (4). A sealing ring (5) is installed on the surface of the injection nozzle (4).

8. The injection mold pressure testing device according to claim 1, characterized in that, A flange (9) is installed on the side of the connecting pipe (2), and a screw (8) is connected between one end of the shut-off valve (1) and the flange (9).

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