A pressure-type injection mold sealing test device

Abstract

This invention relates to the field of injection mold testing technology, specifically to a pressure-type injection mold sealing performance testing device. It includes a testing component, which comprises a support mechanism. A sealing element is provided on the outer wall of the contact area between the fixed mold body and the movable mold body. A pressure injection mechanism is sealed and installed at the injection port of the fixed mold body, and the other side of the pressure injection mechanism is installed on the inner wall of the support mechanism. This invention receives a signal from a pressure sensor, causing the gas injection head to stop gas delivery. External force is then used to push the movable mold body to perform a re-closing operation. During the closing process, the connecting rod can exert a squeezing effect on the sealing element. By calculating the total gas delivery volume and the amount of gas remaining in the sealing element, the capacity of the cavity in a sealed state can be determined. In subsequent use, as long as the injected gas volume does not exceed this capacity, the mold body can maintain a sealed state.

Description

Technical Field

[0001] This invention relates to the field of injection mold testing technology, and more specifically, to a pressure-type injection mold sealing testing device. Background Technology

[0002] Injection molds are key process equipment used in the plastics processing industry to mold plastic products. Through a specific cavity structure, they impart the desired shape and dimensional accuracy to the plastic melt during the injection molding process. When injection liquid is injected into the injection mold cavity, the generation of air bubbles is a common problem.

[0003] When injection molding liquid fills the mold cavity, air bubbles can easily form due to various factors, such as the presence of gas in the injection molding liquid itself or air being drawn in due to excessive injection speed. These air bubbles occupy the space inside the mold cavity and interfere with the normal judgment mechanism of the injection molding equipment. The injection molding equipment usually controls the injection process based on set parameters such as pressure, time, or stroke. When air bubbles are present in the cavity, the pressure or other signals fed back to the equipment may cause the equipment to mistakenly believe that the injection process has been completed, thus prematurely terminating the injection process. Ultimately, this results in the molded product containing air bubbles, which seriously affects the appearance integrity of the product.

[0004] To address this prevalent bubble problem, the common practice in injection molding is to continue injecting molten plastic even when the mold encounters resistance due to bubbles or other reasons. This strategy, to some extent, can expel bubbles from the cavity or dissolve them in the molten plastic by increasing injection pressure and continuous melt flow, thereby reducing the amount of bubbles remaining in the cavity and improving product molding quality. Therefore, before using an injection mold, a simple test of its internal capacity is conducted to determine the amount of molten plastic required to maintain a sealed state during injection. However, since injection molds are generally opaque, operators cannot directly observe the actual amount of molten plastic injected into the cavity. During continuous pressurization testing, it is easy to over-inject molten plastic. Once the excess molten plastic exceeds the cavity capacity, it will leak from the parting surface, gate, and other parts of the mold, making it inconvenient to test the amount of air injected into the cavity. Summary of the Invention

[0005] The purpose of this invention is to provide a pressure-type injection mold sealing performance testing device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention aims to provide a pressure-type injection mold sealing performance testing device, including a testing component. The testing component includes a support mechanism, and a mold body is placed inside the support mechanism. The mold body includes a fixed mold body and a movable mold body, and the fixed mold body and the movable mold body are closed to form a cavity.

[0007] A sealing element is adsorbed on the outer wall of the contact area between the fixed mold body and the movable mold body, and a pressure injection mechanism is sealed at the injection port of the fixed mold body. The other side of the pressure injection mechanism is installed on the inner wall of the support mechanism.

[0008] During the process of the pressurized injection mechanism injecting gas into the cavity, the sealing element helps the cavity maintain a sealed state. As the pressurized injection mechanism continues to operate, the cavity becomes overfilled, and the movable mold body slides open. At this time, the sealing element is used to retain the gas that leaks out during mold opening. During the mold opening process of the movable mold body, the pressurized injection mechanism receives the extrusion force and stops. Subsequently, the movable mold body slides in the opposite direction to close the mold. At the same time, the support mechanism can squeeze the sealing element, forcing the gas in the sealing element to flow back into the cavity. By calculating the amount of gas injected by the pressurized injection mechanism and the amount of gas in the sealing element, the capacity value of the cavity under sealed state can be obtained.

[0009] As a further improvement to this technical solution, the support mechanism includes a folding frame, which has an "L"-shaped structure. A central ring plate is fixedly installed at one end of the folding frame, and a sliding cavity is formed between the central ring plate and the folding frame. A fixed support plate is movably engaged at the end of the central ring plate away from the sliding cavity. The fixed support plate has a hollow structure and is used to support the fixed mold body. Four sets of connecting rods are slidably arranged on the inner wall of the central ring plate. The four sets of connecting rods cooperate with each other to support the movable mold body. The ends of the four sets of connecting rods away from the central ring plate are all located inside the sliding cavity.

[0010] As a further improvement to this technical solution, all four sets of connecting rods include an extension plate. The end of the extension plate near the sliding cavity is bent. Multiple elastic elements are fixedly installed on the end of the extension plate near the middle of the central ring plate. The side of the multiple elastic elements away from the extension plate is connected to the surface of the pressure plate.

[0011] As a further improvement to this technical solution, the pressurized injection mechanism includes an injection pipe installed in the injection port of the fixed mold body. The injection pipe and the injection port are connected in a movable sealed manner. A gas injection head is fixedly connected to the side of the injection pipe away from the injection port. A pressure sensor body is installed on the inner wall of the folding frame. The pressure sensor body is located inside the sliding cavity.

[0012] As a further improvement to this technical solution, the sealing element includes two adsorption and fixing rings, which are respectively installed on the outer walls of the fixed mold body and the movable mold body, and a spring-loaded pad is fixedly installed between the two adsorption and fixing rings. The spring-loaded pad is made of elastic material.

[0013] As a further improvement to this technical solution, both of the adsorption and fixing rings are suction cup structures, used to adsorb and fix them on the surfaces of the fixed mold and the movable mold.

[0014] As a further improvement to this technical solution, the inner wall of the middle ring plate is provided with four limiting cavities, and each of the four extension plates is fixedly connected to a sliding rod on the side surface near the middle ring plate. The sliding rod is in the shape of a cross, and the surface of the sliding rod is in contact with the inner wall of the limiting cavity. The surface of the sliding rod and the inner wall of the limiting cavity are connected by an elastic rod.

[0015] As a further improvement to this technical solution, each of the four pressure plates has a cutting surface at one end near the middle ring plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] In this pressurized injection mold sealing test device, the fixed support plate provides stable support for the fixed mold body. At the same time, the folding frame and connecting rod work together to provide stable support for the movable mold body. In this case, with the use of the sealing element, a good sealing environment can be achieved inside the cavity. During the continuous operation of the pressurized injection mechanism, once the amount of gas delivered exceeds the cavity's capacity limit, the movable mold body will automatically slide open because the movable mold body and the fixed mold body are connected by a movable connection. At this time, the excess gas will be effectively stored by the sealing element.

[0018] With the help of external force, the movable mold body is pushed to perform a second mold closing operation. During the mold closing process, the connecting rod can ensure the accuracy of the sliding mold closing of the movable mold body, and at the same time, it can exert a squeezing effect on the seal, so that the gas in the seal can flow back into the cavity as much as possible. After the mold closing is completed, the total amount of gas delivered and the amount of gas remaining in the seal are calculated to obtain the capacity of the cavity in the sealed state. During the subsequent use of the mold body, as long as the amount of gas injected does not exceed this capacity, the mold body can be guaranteed to maintain a sealed state. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall disassembled structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the gas delivery structure inside the mold body of the present invention;

[0021] Figure 3This is a schematic diagram of the mold body in the open state after gas delivery according to the present invention;

[0022] Figure 4 This is a schematic diagram of the gas flow structure during the sliding mold closing of the movable mold body according to the present invention;

[0023] Figure 5 This is a schematic diagram of the support mechanism structure of the present invention;

[0024] Figure 6 This is a side view of the mold body during the testing process of the present invention;

[0025] Figure 7 For the present invention Figure 2 A schematic diagram of the structure at point A;

[0026] Figure 8 For the present invention Figure 4 A schematic diagram of the structure at point B.

[0027] The meanings of the labels in the diagram are as follows:

[0028] 1. Mold body; 11. Fixed mold body; 12. Movable mold body; 13. Cavity;

[0029] 2. Detection components; 21. Support mechanism; 22. Pressurization injection mechanism; 23. Seals;

[0030] 211. Folding frame; 212. Fixed support plate; 213. Middle ring plate; 214. Connecting rod; 2141. Extension plate; 2142. Elastic element; 2143. Pressure plate; 215. Sliding cavity;

[0031] 221. Gas injection head; 222. Pressure sensor body; 223. Injection tube;

[0032] 231. Adsorption fixing ring; 232. Medium elastic pad;

[0033] 3. Limiting cavity; 31. Slide rod;

[0034] 4. Draw the cutting surface. Detailed Implementation

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0036] Please see Figure 1 and Figure 2As shown, the purpose of this embodiment is to provide a pressure-type injection mold sealing test device, including a test component 2. The test component 2 includes a support mechanism 21. The mold body 1 is placed inside the support mechanism 21. The mold body 1 includes a fixed mold body 11 and a movable mold body 12. The fixed mold body 11 and the movable mold body 12 are closed to form a cavity 13.

[0037] A sealing element 23 is adsorbed on the outer wall of the contact point between the fixed mold body 11 and the movable mold body 12. A pressure injection mechanism 22 is sealed at the injection port of the fixed mold body 11. The other side of the pressure injection mechanism 22 is installed on the inner wall of the support mechanism 21. During the process of the pressure injection mechanism 22 injecting gas into the cavity 13, the sealing element 23 is used to help the cavity 13 maintain a sealed state. As the pressure injection mechanism 22 continues to operate, the cavity 13 becomes overfilled, and the movable mold body 12 slides open. At this time, the sealing element 23 is used to retain the gas that leaks out during the mold opening. During the mold opening process of the movable mold body 12, the pressure injection mechanism 22 receives the extrusion force and stops. Subsequently, the movable mold body 12 slides in the opposite direction to close the mold. At the same time, the support mechanism 21 can squeeze the sealing element 23, forcing the gas in the sealing element 23 to flow back into the cavity 13. By calculating the amount of gas injected by the pressure injection mechanism 22 and the amount of gas in the sealing element 23, the capacity value of the cavity 13 in the sealed state can be obtained.

[0038] Before testing the sealing performance of the mold body 1, the fixed mold body 11 and the movable mold body 12 need to be supported by the support mechanism 21 and kept in a closed state. The specific structure of the support mechanism 21 is disclosed below. The support mechanism 21 includes a folding frame 211, which is an "L" shaped structure. A middle ring plate 213 is fixedly installed at one end of the folding frame 211. A sliding cavity 215 is formed between the middle ring plate 213 and the folding frame 211. A fixed support plate 212 is movably engaged at the end of the middle ring plate 213 away from the sliding cavity 215. The fixed support plate 212 is a hollow structure used to support the fixed mold body 11. Four sets of connecting rods 214 are slidably arranged on the inner wall of the middle ring plate 213. The four sets of connecting rods 214 cooperate with each other to support the movable mold body 12. The ends of the four sets of connecting rods 214 away from the middle ring plate 213 are all located inside the sliding cavity 215.

[0039] All four sets of connecting rods 214 include an extension plate 2141. The end of the extension plate 2141 near the slide cavity 215 is bent. Multiple elastic elements 2142 are fixedly installed on the end of the extension plate 2141 near the middle of the middle ring plate 213. The side of the multiple elastic elements 2142 away from the extension plate 2141 is connected to the surface of the pressure plate 2143.

[0040] See Figure 2 and combined Figure 5As shown, the fixed support plate 212 has a hollow structure, and its inner wall is fitted with an anti-slip fixing pad (made of elastic material, such as rubber), which can provide stable support for the fixed mold body 11. Then, the movable mold body 12 is clamped and supported by four sets of connecting rods 214. After the extension plate 2141 of the connecting rod 214 is tightly attached to the surface of the movable mold body 12, the support effect of the movable mold body 12 can be effectively improved. After that, the fixed support plate 212 and the middle ring plate 213 are snapped together, so that the mold closing operation of the movable mold body 12 and the fixed mold body 11 can be realized, thereby making the inside of the cavity 13 in a sealed state.

[0041] The multiple connecting rods fixedly installed on the surface of the fixed support plate 212 cooperate with the buckles set on the surface of the middle ring plate 213 to achieve snap-fit ​​installation. Specifically, during the installation operation, the connecting rods on the fixed support plate 212 are aligned with the corresponding buckle positions on the surface of the middle ring plate 213, and then a certain force is applied to insert the connecting rods into the buckles. The shape of the connecting rods matches the internal structure of the buckles, thereby forming a stable snap-fit ​​connection. In this way, the fixed support plate 212 and the middle ring plate 213 are firmly connected together, thereby ensuring the stability and reliability of the sealing state in the cavity 13 after the movable mold body 12 and the fixed mold body 11 are closed. It should be noted that when inspecting different mold bodies 1, the appropriate size of the support mechanism 21 can be selected according to the size of the mold body 1 to be inspected.

[0042] After the mold body 1 to be tested is installed, the test gas is injected into the cavity 13 through the pressurized injection mechanism 22 to test the sealing performance of the cavity 13. The specific structure of the pressurized injection mechanism 22 is disclosed below. The pressurized injection mechanism 22 includes an injection pipe 223 installed in the injection port of the fixed mold body 11. The injection pipe 223 and the injection port are connected by a movable sealing type. A gas injection head 221 is fixedly connected to the side of the injection pipe 223 away from the injection port. A pressure sensor body 222 is installed on the inner wall of the folding frame 211. The pressure sensor body 222 is located inside the slide cavity 215.

[0043] Combination Figure 3It can be seen that the injection tube 223 is installed in the injection port of the fixed mold body 11 by plugging in, and the two are sealed together, so as to ensure that the gas delivered by the gas injection head 221 can smoothly enter the cavity 13 in a sealed state. Since the extension plate 2141 can slide on the inner wall of the middle ring plate 213, and the movable mold body 12 and the fixed mold body 11 are connected in a movable fit, once the gas delivered by the gas injection head 221 is excessive and exceeds the bearing capacity of the cavity 13, the movable mold body 12 will slide inside the slide cavity 215, thereby realizing the sliding mold opening operation. When the movable mold body 12 slides open, its position changes, and the outer wall of the movable mold body 12 will squeeze the pressure sensor body 222 installed inside the slide cavity 215. Then, the pressure sensor body 222 transmits the signal to the gas injection head 221, and the gas injection head 221 immediately stops delivering gas and calculates the total amount of gas delivered.

[0044] The working principle of the aforementioned pressure sensor body 222 is as well known to those skilled in the art. Based on the characteristics of the pressure-sensitive element, when the movable mold 12 slides open and presses against the pressure sensor body 222, the pressure-sensitive element will deform. This deformation will cause changes in its electrical characteristics (such as resistance, capacitance, inductance, etc.). These changes in electrical characteristics have a certain functional relationship with the applied pressure. Through the internal signal conversion circuit, the pressure sensor body 222 converts this change in electrical characteristics into a recognizable electrical signal, and then transmits this electrical signal to the gas injection head 221, thereby enabling the gas injection head 221 to receive a command to stop the gas delivery, so as to control the gas delivery process. It should be noted that after the pressure sensor body 222 deforms and transmits an electrical signal once, it will not automatically return to the working state when the movable mold 12 moves away from the pressure sensor body 222. Only when the gas injection head 221 is reopened will the pressure sensor body 222 be reactivated, so that it can respond to the pressure change of the movable mold 12 and transmit signals again.

[0045] When conducting sealing tests on the mold body 1, liquid testing was abandoned in favor of gas testing. The key reason for this is that gas does not generate air bubbles during the delivery process, thus effectively avoiding testing errors caused by air bubbles. On the other hand, the large spacing between gas molecules and their strong fluidity allow them to better penetrate into the tiny gaps and complex structures of the mold, more comprehensively detecting potential leaks. This ensures that the test results have higher accuracy and reliability, and is more conducive to accurately judging the sealing condition of the mold body 1.

[0046] When the amount of gas exceeds the capacity of the cavity 13, the movable mold 12 will slide open, and the gas will leak out from the parting surface. Therefore, the gas can be retained by the sealing element 23. The specific structure of the sealing element 23 is disclosed below. The sealing element 23 includes two adsorption fixing rings 231. The two adsorption fixing rings 231 are respectively installed on the outer walls of the fixed mold 11 and the movable mold 12. A spring pad 232 is fixedly installed between the two adsorption fixing rings 231. The spring pad 232 is made of elastic material (preferably airbag material). Both adsorption fixing rings 231 are suction cup structures used to adsorb and fix them on the surfaces of the fixed mold 11 and the movable mold 12.

[0047] Before installing the fixed mold 11 and the movable mold 12 inside the fixed support plate 212 and the middle ring plate 213, the two adsorption fixing rings 231 are adsorbed and fixed to the outer walls of the fixed mold 11 and the movable mold 12 near the parting surface, respectively. Thus, the spring pad 232 between the two adsorption fixing rings 231 (the surfaces of the fixed mold 11 and the movable mold 12 near the parting surface are designed without holes, therefore, the adsorption fixing rings 231 can achieve stable adsorption) is positioned between the mating surfaces of the fixed mold 11 and the movable mold 12, thereby achieving a preliminary fixing effect on the fixed mold 11 and the movable mold 12, and achieving a preliminary seal for the cavity 13. Figure 2 As shown, after the fixed mold body 11 and the movable mold body 12 are installed inside the support mechanism 21, the air in the cavity 13 is evacuated by means of the injection port. At the same time, the surface of the spring pad 232 is squeezed and fixed by the pressure plate 2143 (at this time, the spring pad 232 is in a flat state and there is no gas inside it).

[0048] See Figure 3 As shown, after the gas injection head 221 delivers gas, causing the gas volume to exceed the capacity of the cavity 13, the movable mold body 12 will slide open. At this moment, the gas in the cavity 13 will flow out from the parting surface. Since one of the adsorption fixing rings 231 and the pressure plate 2143 will be displaced as the movable mold body 12 slides, the spring pad 232 will enter a stretched state. At the same time, combined with the gas flowing out of the cavity 13, the spring pad 232 will expand, thereby collecting the excess gas. During this process, the fixed mold body 11 and the movable mold body 12 can always maintain a sealed state.

[0049] When the movable mold body 12 slides open and touches the pressure sensor body 222, the gas injection head 221 stops the gas injection operation. Then, the movable mold body 12 is pushed by an external force (selecting an appropriate force based on the size of the mold body 1, such as using a cylinder or manual operation) to slide towards the fixed mold body 11, thus performing the mold closing operation again. During the mold closing process of the movable mold body 12, the pressure plate 2143, with the help of the elastic element 2142, can compress the expanded spring pad 232. Figure 6 As shown, four pressure plates 2143 are respectively placed on the surface of the spring pad 232. With the squeezing action of the pressure plates 2143, some of the gas inside the spring pad 232 can flow into the cavity 13. When the fixed mold body 11 and the movable mold body 12 are closed again, the gas inside the cavity 13 can reach a relatively saturated state.

[0050] After the mold closing operation is completed, the gas stored inside the spring pad 232 is discharged through the output port (not shown in the figure), and the gas volume is accurately calculated. By combining this calculation result with the total gas delivery obtained from the previous test, the gas content of the cavity 13 under a relatively saturated state can be estimated. By repeating this test process multiple times, more reliable data results can be obtained. In this way, during the actual use of the mold body 1, as long as the gas injection amount does not exceed this determined value, it can be ensured that the cavity 13 achieves a good sealing effect without affecting the mold forming, thus ensuring the normal use of the mold and the quality stability of the molded product.

[0051] Since the movement of the movable mold body 12 needs to be precisely guided and limited during the opening and closing process of the mold body 1, four limiting cavities 3 are provided on the inner wall of the middle ring plate 213. Each of the four extension plates 2141 is fixedly connected to a sliding rod 31 on the side surface near the middle ring plate 213. The sliding rod 31 is in the shape of a cross, and the surface of the sliding rod 31 is in contact with the inner wall of the limiting cavity 3. The surface of the sliding rod 31 and the inner wall of the limiting cavity 3 are connected by an elastic rod.

[0052] The improvements are: See Figure 8 As shown, the inner wall of the central ring plate 213 is provided with four limiting cavities 3, and the cross-shaped sliding rods 31 fixed on the four extension plates 2141 are in close contact with the inner wall of the limiting cavity 3. When the mold is closed, the connecting rod 214 can play a better role through the cooperation of the sliding rod 31 and the limiting cavity 3. On the one hand, it can improve the squeezing effect on the central spring pad 232, so that the gas in the central spring pad 232 can flow back smoothly. On the other hand, it can drive the movable mold body 12 and the fixed mold body 11 to close the mold accurately, ensuring the accuracy and sealing of the mold body 1. Among them, the elastic support of the elastic rod can ensure the stability of the installation position of the movable mold body 12.

[0053] Since it is necessary to ensure that the pressure plate 2143 can accurately and efficiently squeeze the spring pad 232 during the mold closing process, so that the gas in the spring pad 232 can flow back smoothly into the cavity 13, so as to achieve reasonable gas distribution in the cavity 13 and good sealing effect of the mold, the four pressure plates 2143 are all provided with a guide cutting surface 4 at one end near the middle ring plate 213.

[0054] The improvements are as follows: Figure 7 As shown, the guide surface 4 can guide and position the pressure plate 2143 as it moves closer to the spring pad 232 along with the movable mold body 12, so that the pressure plate 2143 can contact the spring pad 232 more accurately and gradually apply uniform extrusion pressure, reducing problems such as poor gas return or poor sealing caused by inaccurate extrusion position or uneven force, thereby effectively improving the stability and reliability of the mold in the mold opening and closing and gas treatment process.

[0055] In summary, the working principle of this scheme is as follows: Before installing the fixed mold 11 and the movable mold 12 inside the fixed support plate 212 and the middle ring plate 213, the two adsorption fixing rings 231 are adsorbed and fixed to the outer walls of the fixed mold 11 and the movable mold 12 near the parting surface. In this way, the spring pad 232 between the two adsorption fixing rings 231 can be placed between the mating surfaces of the fixed mold 11 and the movable mold 12, thereby achieving a preliminary fixing effect on the fixed mold 11 and the movable mold 12 and achieving a preliminary seal for the cavity 13. Then, using four sets of connecting rods 21 4. The movable mold 12 is clamped and supported. After the extension plate 2141 of the connecting rod 214 is tightly attached to the surface of the movable mold 12, the support effect of the movable mold 12 can be effectively improved. Then, the fixed support plate 212 and the middle ring plate 213 are snapped together, so that the mold closing operation of the movable mold 12 and the fixed mold 11 can be realized. After the fixed mold 11 and the movable mold 12 are installed inside the support mechanism 21, the air in the cavity 13 is evacuated by the injection port. At the same time, the surface of the spring pad 232 will be fixed by the pressure plate 2143.

[0056] After the gas injection head 221 delivers gas, causing the gas volume to exceed the capacity of the cavity 13, the movable mold body 12 will slide open. At this moment, the gas in the cavity 13 will flow out from the parting surface. Since one of the adsorption fixing rings 231 and the pressure plate 2143 will be displaced as the movable mold body 12 slides, the spring pad 232 will enter a stretched state. At the same time, combined with the gas flowing out of the cavity 13, the spring pad 232 will expand, thereby collecting the excess gas.

[0057] When the movable mold body 12 slides open and touches the pressure sensor body 222, the gas injection head 221 stops the gas injection operation. Then, the movable mold body 12 is pushed by external force to slide towards the fixed mold body 11, thereby performing the mold closing operation again. During the mold closing process of the movable mold body 12, the pressure plate 2143 can squeeze the spring pad 232 in the expanded state with the help of the elastic element 2142. With the squeezing action of the pressure plate 2143, some of the gas inside the spring pad 232 can flow into the cavity 13. When the fixed mold body 11 and the movable mold body 12 are closed again, the gas inside the cavity 13 can reach a relatively saturated state.

[0058] After the mold closing operation is completed, the gas stored inside the spring pad 232 is discharged through the output port, and the gas volume is accurately calculated. By combining this calculation result with the total gas delivery obtained from previous tests, the gas content of cavity 13 under relatively saturated conditions can be estimated. By repeating this testing process multiple times, more reliable data results can be obtained. In this way, during the actual use of the mold body 1, as long as the gas injection amount does not exceed this determined value, it can be ensured that cavity 13 achieves a good sealing effect without affecting mold forming, thus ensuring the normal use of the mold and the quality stability of the molded product.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure-type injection mold sealing performance testing device, comprising a testing component (2), characterized in that: The detection component (2) includes a support mechanism (21), and a mold body (1) is placed inside the support mechanism (21). The mold body (1) includes a fixed mold body (11) and a movable mold body (12). The fixed mold body (11) and the movable mold body (12) are closed to form a cavity (13). A sealing element (23) is adsorbed on the outer wall of the contact point between the fixed mold (11) and the movable mold (12). A pressure injection mechanism (22) is sealed at the injection port of the fixed mold (11). The other side of the pressure injection mechanism (22) is installed on the inner wall of the support mechanism (21). During the process of the pressurized injection mechanism (22) injecting gas into the cavity (13), the sealing element (23) is used to help the cavity (13) maintain a sealed state. As the pressurized injection mechanism (22) continues to operate, the cavity (13) becomes excessive, and the movable mold body (12) slides open. At this time, the sealing element (23) is used to retain the gas leaked during the mold opening. During the mold opening process of the movable mold body (12), the pressurized injection mechanism (22) receives the extrusion force and stops. Subsequently, the movable mold body (12) slides in the opposite direction to close the mold. At the same time, the support mechanism (21) can squeeze the sealing element (23) to force the gas in the sealing element (23) to flow back into the cavity (13). By calculating the amount of gas injected by the pressurized injection mechanism (22) and the amount of gas in the sealing element (23), the capacity value of the cavity (13) in the sealed state can be obtained. The support mechanism (21) includes a folding frame (211), one end of which is fixedly mounted with a central ring plate (213). A sliding cavity (215) is formed between the central ring plate (213) and the folding frame (211). Four sets of connecting rods (214) are slidably arranged on the inner wall of the central ring plate (213). Each of the four sets of connecting rods (214) includes an extension plate (2141). The end of the extension plate (2141) near the sliding cavity (215) is bent. The end of the extension plate (2141) near the central ring plate (215) is bent. Multiple elastic elements (2142) are fixedly installed at one end of the middle of the ring plate (213). The side of the multiple elastic elements (2142) away from the extension plate (2141) is connected to the surface of the pressure plate (2143). The sealing element (23) includes two adsorption fixing rings (231). The two adsorption fixing rings (231) are respectively installed on the outer wall of the fixed mold body (11) and the movable mold body (12). A medium spring pad (232) is fixedly installed between the two adsorption fixing rings (231). The medium spring pad (232) is made of elastic material. Each of the four pressure plates (2143) has a cutting surface (4) at one end near the middle ring plate (213).

2. The pressure-type injection mold sealing performance testing device according to claim 1, characterized in that: The folding frame (211) has an "L" shaped structure. The end of the middle ring plate (213) away from the sliding cavity (215) is movably connected to a fixed support plate (212). The fixed support plate (212) has a hollow structure and is used to support the fixed mold (11). The four sets of connecting rods (214) cooperate with each other to support the movable mold (12). The ends of the four sets of connecting rods (214) away from the middle ring plate (213) are all located inside the sliding cavity (215).

3. The pressure-type injection mold sealing performance testing device according to claim 2, characterized in that: The pressurized injection mechanism (22) includes an injection pipe (223) installed in the injection port of the fixed mold body (11). The injection pipe (223) and the injection port are connected in a movable sealed manner. A gas injection head (221) is fixedly connected to the side of the injection pipe (223) away from the injection port. A pressure sensor body (222) is installed on the inner wall of the folding frame (211). The pressure sensor body (222) is located inside the slide cavity (215).

4. The pressure-type injection mold sealing performance testing device according to claim 1, characterized in that: Both of the aforementioned adsorption fixing rings (231) are suction cup structures used to adsorb and fix on the surfaces of the fixed mold (11) and the movable mold (12).

5. The pressure-type injection mold sealing performance testing device according to claim 1, characterized in that: The inner wall of the middle ring plate (213) is provided with four limiting cavities (3). Each of the four extension plates (2141) is fixedly connected to a sliding rod (31) on the side surface near the middle ring plate (213). The sliding rod (31) is in the shape of a cross. The surface of the sliding rod (31) is in contact with the inner wall of the limiting cavity (3). The surface of the sliding rod (31) and the inner wall of the limiting cavity (3) are connected by an elastic rod.

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