Device and method for detecting air tightness of injection mold

Abstract

The invention discloses an injection mold air tightness detection device and method, and particularly relates to the technical field of injection mold air tightness detection.The injection mold air tightness detection device comprises a workbench, limiting holes are formed in the two sides of the top of the workbench, a motor is installed on the front surface of the workbench, a two-way lead screw is installed on an output shaft of the motor, and the two-way lead screw penetrates through the limiting holes; two limiting holes are formed in the workbench, the two-way screw rod is arranged in the workbench, the tail end of the two-way screw rod is rotationally connected with the workbench through a bearing, two rod bodies, in different spiral directions, of the two-way screw rod are located in the two limiting holes correspondingly, movable limiting blocks are arranged in the limiting holes, and the two-way screw rod is in threaded connection with the limiting blocks. The outer air cylinder and the inner air cylinder are used for injecting air into the air tank in a staggered manner so as to meet the requirement when the air tightness of the injection mold is tested, and additional air compression equipment does not need to be additionally arranged.

Description

Technical Field

[0001] The invention relates to the field of injection mold air tightness detection, and in particular to an injection mold air tightness detection device and method. Background Art

[0002] Before the injection mold is put into use, it is necessary to conduct an airtightness test on it, such as the airtightness test of the water pipeline of the mold, or the test of the cavity mold surface. During the test, the main methods used are pressure method, gas penetration method, ultrasonic method, immersion method, and dye penetration method;

[0003] Most of the existing methods are pressure methods. The main operating procedures of the pressure method are as follows: after the injection mold is closed, a certain pressure of gas, such as compressed air, is filled into the mold through a specific device. After the gas is filled, it is maintained for a period of time to observe the pressure changes. If the pressure drop is within the allowable range within the specified time, it means that the mold has good air tightness; if the pressure drops too fast and exceeds the allowable range, it indicates that there is a leak in the mold. The pressure method can be further divided into positive pressure method and negative pressure method. The positive pressure method is to fill positive pressure gas for detection, and the negative pressure method is to first pump the mold into negative pressure, and then observe the pressure recovery to judge the air tightness.

[0004] At present, when the positive pressure method in the pressure method is adopted, gas needs to be filled into the injection mold through an air compressor after the injection mold is closed to meet the test needs. After the air tightness test of the injection mold is completed, the mold needs to be separated, and the gas filled in the previous test will be released during the separation. In the subsequent injection mold test, the air compressor will be started again to perform air compression and filling operations, which will lead to a waste of resources. Summary of the invention

[0005] The purpose of the present invention is to provide an injection mold air tightness detection device and method. When the injection mold is "closing" or "opening", the outer gas cylinder and the inner gas cylinder are alternately injected into the interior of the gas tank to meet the needs of testing the air tightness of the injection mold, thereby eliminating the need for additional air compression equipment (i.e., the air compressor in the prior art).

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: an injection mold air tightness detection device, comprising a workbench, both sides of the top of the workbench are provided with limit holes, and a motor is installed on the front surface of the workbench, a bidirectional screw is installed on the output shaft of the motor, the bidirectional screw passes through the limit hole, and the end of the bidirectional screw is rotatably connected to the workbench through a bearing, two rods of the bidirectional screw in different spiral directions are respectively located in two limit holes, a movable limit block is arranged inside the limit hole, and the bidirectional screw is threadedly connected to the limit block;

[0007] Two support frames for placing the upper mold and the lower mold of the mold are symmetrically arranged on the top of the workbench, the support frames are slidably connected to the workbench through a slide rail, and the bottom end of the support frame is connected to the top end of the limit block;

[0008] A component box is fixed to one side of the workbench, and the front surface of the component box is rotatably connected to a box door via a rotating shaft, and a controller is installed on the box door. A gas tank is installed inside the component box, and one side of the gas tank is connected to an injection pipe for injecting high-pressure gas into the mold, and an electromagnetic three-way valve is installed on the injection pipe. A connecting pipe for connecting two molds is provided on one side of the injection pipe, and a pressure gauge for monitoring the air pressure inside the mold is provided on the side of the connecting pipe relative to the injection pipe.

[0009] Preferably, a pressure gauge is installed on one side of the gas tank, and a transparent observation window for observing the pressure gauge is installed on the box door.

[0010] Preferably, an air compression mechanism is provided at the bottom of the workbench for injecting air into the gas tank when the upper mold and the lower mold are closed or separated;

[0011] The air compression mechanism comprises an outer air cylinder and an inner air cylinder, both of which are located at the bottom of the workbench, and both of which are provided with a pipeline fixing frame, and the pipeline fixing frame is fixed to the workbench by bolts, and both of which are provided with a piston inside the outer air cylinder and the inner air cylinder, and a push rod is fixed between the two pistons, and the bottom of the limit block is located below the workbench and is fixed with a connecting plate, and the connecting plate is connected to the push rod;

[0012] The ends of the outer air cylinder and the inner air cylinder are both connected with an air suction pipe and an air charging pipe, the air suction pipe is equipped with an air suction one-way valve, the air charging pipe is equipped with an air charging one-way valve, and the end of the air charging pipe is connected with the gas tank through a pipeline.

[0013] Preferably, an air intake box is fixed to the bottom of the workbench, and filter screens for filtering dust are provided at both ends of the air intake box, and the air intake pipe is connected to the air intake box.

[0014] Preferably, a pressure relief pipe is connected to the bottom of the gas tank, and a solenoid valve is installed on the pressure relief pipe.

[0015] Preferably, the end of the pressure relief pipe extends to the interior of the air intake box, and a blow pipe is provided inside the air intake box. Both ends of the blow pipe are close to the filter screen, and nozzles are installed at both ends of the blow pipe.

[0016] When measuring the sealing of the mold parting surface, the following steps are included:

[0017] S1. Place the upper mold and the lower mold of the injection mold on their sides on two support frames through a hanger, and make the cavities of the upper mold and the lower mold face each other;

[0018] S2, start the motor through the controller to drive the bidirectional screw to rotate, so that the two limit blocks and the two support frames move towards each other as a whole, so that the upper mold and the lower mold complete the mold closing operation;

[0019] S3. After the upper and lower molds of the injection mold are closed, the air injection pipe is inserted into the feed port of the upper mold, and then the pressure gauge is installed on the feed port of the lower mold;

[0020] S4. Open the electromagnetic three-way valve through the controller to allow the high-pressure gas inside the gas tank to enter the cavity between the upper mold and the lower mold through the gas injection pipe, observe the pressure value on the pressure gauge, and when the pressure value rises to the normal pressure value of the cavity, close the electromagnetic three-way valve to stop injecting gas into the injection mold;

[0021] S5. Record the pressure value of the pressure gauge when the electromagnetic three-way valve is closed. After a period of time, observe the pressure value of the pressure gauge again. If the pressure value before and after the pressure gauge drops within the estimated range, it means that the sealing performance of the injection mold parting surface is good. On the contrary, if the pressure value before and after the pressure gauge drops beyond the estimated range, it means that the sealing performance of the injection mold parting surface is poor.

[0022] S6. After the test is completed, open the electromagnetic three-way valve to exhaust the gas inside the injection mold, and then separate the mold.

[0023] Preferably, the pressure gauge can be replaced with a pressure sensor.

[0024] When measuring the air tightness of the mold water channel, follow the steps below:

[0025] S1. Place the upper mold and the lower mold of the injection mold on their sides on two support frames through a hanger, and make the cavities of the upper mold and the lower mold face each other;

[0026] S2, start the motor through the controller to drive the bidirectional screw to rotate, so that the two limit blocks and the two support frames move towards each other as a whole, so that the upper mold and the lower mold complete the mold closing operation;

[0027] S3. After the upper and lower molds of the injection mold are closed, the air injection pipe is inserted into the water transport inlet of the lower mold, and then the connecting pipe is respectively connected to the water transport outlet of the lower mold and the water transport inlet of the upper mold, and then the pressure gauge is installed at the water transport outlet of the upper mold;

[0028] S4. Open the electromagnetic three-way valve through the controller to allow the high-pressure gas inside the gas tank to enter the water transport pipeline of the injection mold through the gas injection pipe, observe the pressure value on the pressure gauge, and when the pressure value rises to the designed pressure value of the water transport pipeline, close the electromagnetic three-way valve to stop injecting gas into the water transport pipeline of the injection mold;

[0029] S5. Record the pressure value of the pressure gauge when the electromagnetic three-way valve is closed. After a period of time, observe the pressure value of the pressure gauge again. If the pressure value before and after the pressure gauge drops within the estimated range, it means that the sealing of the water transport pipeline of the injection mold is good. On the contrary, if the pressure value before and after the pressure gauge drops beyond the estimated range, it means that the sealing of the water transport pipeline of the injection mold is poor.

[0030] S6. After the test is completed, open the electromagnetic three-way valve to exhaust the gas inside the injection mold, and then separate the mold.

[0031] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0032] 1. After the upper mold and the lower mold of the injection mold are closed, the present invention inserts the gas injection pipe into the feed port of the upper mold, installs the pressure gauge on the feed port of the lower mold, opens the electromagnetic three-way valve, and allows the high-pressure gas inside the gas tank to enter the cavity between the upper mold and the lower mold through the gas injection pipe. After a period of time, observe whether the pressure value of the pressure gauge drops within the estimated range, and then judge whether the sealing performance of the injection mold parting surface is excellent;

[0033] 2. The present invention inserts the gas injection pipe into the water transport inlet of the lower mold, and then connects the connecting pipe to the water transport outlet of the lower mold and the water transport inlet of the upper mold respectively, and then installs the pressure gauge at the water transport outlet of the upper mold, so that the high-pressure gas inside the gas tank enters the water transport pipeline of the injection mold through the gas injection pipe. After a period of time, observe whether the pressure value of the pressure gauge drops within the estimated range, and then judge whether the sealing quality of the water transport pipeline of the injection mold is excellent;

[0034] 3. In the present invention, when the injection mold is "closing" or "parting", the outer air cylinder and the inner air cylinder will alternately rush gas into the interior of the gas tank to meet the needs of testing the air tightness of the injection mold, without the need to install additional air compression equipment. When the gas pressure inside the gas tank is too high, the solenoid valve can be opened to discharge excess "compressed air". The discharged compressed air will enter the blow pipe through the pressure relief pipe, and the filter can be "back-blown" from the inside of the air inlet box in conjunction with the nozzle, thereby improving the convenience of cleaning the filter and ensuring the cleanliness of the air inhaled by the outer air cylinder and the inner air cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a structural schematic diagram of the present invention;

[0037] Figure 2 A top view of the workbench of the present invention;

[0038] Figure 3 It is a structural schematic diagram of the support frame of the present invention;

[0039] Figure 4 It is a schematic diagram of the internal structure of the component box of the present invention;

[0040] Figure 5 It is a distribution diagram of the entirety of the inflation tube and the pressure relief tube of the present invention;

[0041] Figure 6 A distribution diagram of the first gas cylinder and the second gas cylinder of the present invention;

[0042] Figure 7 is a cross-sectional view of the first gas cylinder and the second gas cylinder of the present invention;

[0043] Figure 8 It is a schematic diagram of the structure of the inflation tube of the present invention;

[0044] Fig. 9 It is a schematic structural diagram of the pressure relief pipe of the present invention;

[0045] Fig.10 It is a schematic diagram of the internal structure of the air intake box of the present invention;

[0046] Fig.11 for Fig.10 Enlarged view of part A in .

[0047] Description of reference numerals:

[0048] 1. Workbench; 2. Piston; 3. Component box; 4. Box door; 5. Controller; 6. Motor; 7. Support frame; 8. Limit hole; 9. Gas injection pipe; 10. Solenoid three-way valve; 11. Pressure gauge; 12. Connecting pipe; 13. Inflating pipe; 14. Pressure relief pipe; 15. Inlet box; 16. Two-way screw rod; 17. Limit block; 18. Gas tank; 19. Pressure gauge; 20. Solenoid valve; 21. Filter; 22. Blowing pipe; 23. Connecting plate; 24. Push rod; 25. Outer air cylinder; 26. Inner air cylinder; 27. Nozzle; 28. Pipe fixing frame; 29. ​​Intake pipe; 30. Intake check valve; 31. Inflating check valve. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0050] Example 1

[0051] Reference Figure 1-Figure 11 When measuring the sealing of the injection mold parting surface, the following steps are included:

[0052] S1, placing the upper mold and the lower mold of the injection mold on their sides on two support frames 7 through hangers, and making the cavities of the upper mold and the lower mold face each other;

[0053] S2, start the motor 6 through the controller 5 to drive the bidirectional screw 16 to rotate, so that the two limit blocks 17 and the two support frames 7 move towards each other as a whole, so that the upper mold and the lower mold complete the mold closing operation;

[0054] S3, after the upper mold and the lower mold of the injection mold are closed, the air injection pipe 9 is inserted into the feed port of the upper mold, and then the pressure gauge 11 is installed on the feed port of the lower mold;

[0055] S4, open the electromagnetic three-way valve 10 through the controller 5, so that the high-pressure gas inside the gas tank 18 enters the cavity between the upper mold and the lower mold through the gas injection pipe 9, observe the pressure value of the pressure gauge 11, and when the pressure value rises to the normal pressure value of the cavity, close the electromagnetic three-way valve 10 to stop injecting gas into the injection mold;

[0056] S5. Record the pressure value of the pressure gauge 11 when the electromagnetic three-way valve 10 is closed. After a period of time, observe the pressure value of the pressure gauge 11 again. If the pressure value before and after the pressure gauge 11 drops within the estimated range, it means that the sealing performance of the injection mold parting surface is good. On the contrary, if the pressure value before and after the pressure gauge 11 drops beyond the estimated range, it means that the sealing performance of the injection mold parting surface is poor.

[0057] S6. After the test is completed, the electromagnetic three-way valve 10 is opened to discharge the gas inside the injection mold, and then the mold is separated.

[0058] Furthermore, the pressure gauge 11 may be replaced with a pressure sensor.

[0059] Example 2

[0060] Reference Figure 1-Figure 11 When measuring the air tightness of the mold water channel, follow the steps below:

[0061] S1, placing the upper mold and the lower mold of the injection mold on their sides on two support frames 7 through hangers, and making the cavities of the upper mold and the lower mold face each other;

[0062] S2, start the motor 6 through the controller 5 to drive the bidirectional screw 16 to rotate, so that the two limit blocks 17 and the two support frames 7 move towards each other as a whole, so that the upper mold and the lower mold complete the mold closing operation;

[0063] S3, after the upper mold and the lower mold of the injection mold are closed, the air injection pipe 9 is inserted into the water transport inlet of the lower mold, and then the connecting pipe 12 is respectively connected to the water transport outlet of the lower mold and the water transport inlet of the upper mold, and then the pressure gauge 11 is installed at the water transport outlet of the upper mold;

[0064] S4, open the electromagnetic three-way valve 10 through the controller 5, so that the high-pressure gas inside the gas tank 18 enters the water transport pipeline of the injection mold through the gas injection pipe 9, observe the pressure value of the pressure gauge 11, and when the pressure value rises to the pressure value designed for the water transport pipeline, close the electromagnetic three-way valve 10 to stop injecting gas into the water transport pipeline of the injection mold;

[0065] S5. Record the pressure value of the pressure gauge 11 when the electromagnetic three-way valve 10 is closed. After a period of time, observe the pressure value of the pressure gauge 11 again. If the pressure value before and after the pressure gauge 11 drops within the estimated range, it means that the sealing of the water transport pipeline of the injection mold is good. On the contrary, if the pressure value before and after the pressure gauge 11 drops beyond the estimated range, it means that the sealing of the water transport pipeline of the injection mold is poor.

[0066] S6. After the test is completed, the electromagnetic three-way valve 10 is opened to discharge the gas inside the injection mold, and then the mold is separated.

[0067] Example 3

[0068] The present invention provides Figure 1-Figure 11 The injection mold air tightness detection device shown includes a workbench 1, and limit holes 8 are provided on both sides of the top of the workbench 1, and a motor 6 is installed on the front surface of the workbench 1, and a bidirectional screw rod 16 is installed on the output shaft of the motor 6, and the bidirectional screw rod 16 passes through the limit hole 8, and the end of the bidirectional screw rod 16 is rotatably connected to the workbench 1 through a bearing, and the two rods of the bidirectional screw rod 16 with two different spiral directions are respectively located in the two limit holes 8, and a movable limit block 17 is arranged inside the limit hole 8, and the bidirectional screw rod 16 is threadedly connected to the limit block 17;

[0069] Two support frames 7 for placing the upper mold and the lower mold of the mold are symmetrically arranged on the top of the workbench 1. The support frames 7 are slidably connected to the workbench 1 through a slide rail, and the bottom end of the support frame 7 is connected to the top end of the limit block 17;

[0070] A component box 3 is fixed to one side of the workbench 1, and the front surface of the component box 3 is rotatably connected to a box door 4 via a rotating shaft, and a controller 5 is installed on the box door 4. A gas tank 18 is installed inside the component box 3, and one side of the gas tank 18 is connected to an injection pipe 9 for injecting high-pressure gas into the mold, and an electromagnetic three-way valve 10 is installed on the injection pipe 9. A connecting pipe 12 for connecting two molds is provided on one side of the injection pipe 9, and a pressure gauge 11 for monitoring the air pressure inside the mold is provided on the side of the connecting pipe 12 relative to the injection pipe 9.

[0071] Furthermore, a pressure gauge 19 is installed on one side of the gas tank 18 , and a transparent observation window for observing the pressure gauge 19 is installed on the box door 4 . Through the observation window, the pressure gauge 11 on the gas tank 18 can be directly observed without opening the box door 4 .

[0072] Furthermore, an air compression mechanism is provided at the bottom of the workbench 1 for injecting air into the air tank 18 when the upper mold and the lower mold are closed or separated;

[0073] The air compression mechanism includes an outer air cylinder 25 and an inner air cylinder 26, both of which are located at the bottom of the workbench 1, and a pipe fixing frame 28 is provided on the outer air cylinder 25 and the inner air cylinder 26, and the pipe fixing frame 28 is fixed to the workbench 1 by bolts, and a piston 2 is provided inside the outer air cylinder 25 and the inner air cylinder 26, and a push rod 24 is fixed between the two pistons 2, and the bottom of the limit block 17 is located below the workbench 1 and fixed with a connecting plate 23, and the connecting plate 23 is connected to the push rod 24;

[0074] The ends of the outer air cylinder 25 and the inner air cylinder 26 are both connected to the suction pipe 29 and the inflation pipe 13. The suction pipe 29 is installed with an suction check valve 30, and the inflation pipe 13 is installed with an inflation check valve 31. The end of the inflation pipe 13 is connected to the gas tank 18 through a pipeline. In order to reduce the reverse pressure of the gas tank 18 on the inflation pipe 13, the inflation check valve 31 can be "re-installed" at a position of the inflation pipe 13 close to the gas tank 18.

[0075] Furthermore, an air intake box 15 is fixed to the bottom of the workbench 1 , and filters 21 for filtering dust are provided at both ends of the air intake box 15 . The air intake pipe 29 is connected to the air intake box 15 to filter the gas sucked in by the air intake pipe 29 .

[0076] Furthermore, a pressure relief pipe 14 is connected to the bottom of the gas tank 18 , and a solenoid valve 20 is installed on the pressure relief pipe 14 .

[0077] Furthermore, the end of the pressure relief pipe 14 extends to the interior of the air intake box 15 , and a blow pipe 22 is disposed inside the air intake box 15 . Both ends of the blow pipe 22 are close to the filter screen 21 , and nozzles 27 are installed at both ends of the blow pipe 22 .

[0078] Through the above technical solution:

[0079] When in use, during the "closing" process of the upper and lower molds of the injection mold, the limit block 17 will drive the connecting plate 23 to move toward the center of the workbench. During this process, the connecting plate 23 will drive the push rod 24 to move toward the direction of the inner gas cylinder 26, so that the piston 2 will forcibly press the air in the inner gas cylinder 26 into the inflation tube 13, and then the air will enter the interior of the gas tank 18. Under the action of the inflation check valve 31, the gas inside the gas tank 18 cannot return to the inner gas cylinder 26, and in the process of the gas being pressed into the inflation tube 13, the suction check valve 30 can be used to prevent the gas in the inner gas cylinder 26 from overflowing, so as to ensure that during the closing process of the injection mold, the inner gas cylinder 26 can always stably inject air into the interior of the gas tank 18 through the inflation tube 13;

[0080] At the same time, during the "closing" process of the upper and lower molds of the injection mold, while the connecting plate 23 drives the push rod 24 to move toward the inner cylinder 26, the piston inside the outer cylinder 25 will inhale air through the suction pipe 29. Since the suction pipe 29 is connected to the air inlet box 15, the inhaled gas will be filtered by the filter screens 21 at both ends of the air inlet box 15, so that clean air enters the outer cylinder 25.

[0081] After the air tightness test of the injection mold is completed, the upper mold and the lower mold of the injection mold will be "separated". At this time, the gas sucked by the outer cylinder 25 during the "mold closing" process will be forcibly pushed into the inflation tube 13 by the piston 2 inside it, and then will also be merged into the gas tank 18. Similarly, under the action of the inflation check valve 31, it can also ensure that the gas filled in the inflation tube 13 cannot escape. At the same time, the inner cylinder 26 will repeat the working process of the outer cylinder 25 during the "mold closing";

[0082] Therefore, no matter when the injection mold is "closing" or "parting", the outer air cylinder 25 and the inner air cylinder 26 will alternately rush gas into the interior of the gas tank 18. Due to the large number of the outer air cylinder 25 and the inner air cylinder 26, the amount of gas rushing into the gas tank 18 can be increased, and the air is compressed inside the gas tank 18 for the injection mold to test the air tightness, without the need to install additional air compression equipment. The gas pressure inside the gas tank 18 can be seen in real time through the pressure gauge 19. When the gas pressure inside the gas tank 18 is too high, the solenoid valve 20 can be opened to discharge the excess "compressed air". The discharged compressed air will enter the blow pipe 22 through the pressure relief pipe 14, and the nozzle 27 can be used to "back-blow" the filter 21 from the inside of the air inlet box 15, thereby improving the convenience of cleaning the filter 21 and ensuring the cleanliness of the air when the outer air cylinder 25 and the inner air cylinder 26 inhale.

[0083] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. Injection mold air tightness detection device, characterized in that: The invention comprises a workbench (1), wherein both sides of the top of the workbench (1) are provided with limit holes (8), and a motor (6) is installed on the front surface of the workbench (1), and a bidirectional screw rod (16) is installed on the output shaft of the motor (6), the bidirectional screw rod (16) passes through the limit hole (8), and the end of the bidirectional screw rod (16) is rotatably connected to the workbench (1) through a bearing, and the two rod bodies of the bidirectional screw rod (16) with two different spiral directions are respectively located in two limit holes (8), and a movable limit block (17) is arranged inside the limit hole (8), and the bidirectional screw rod (16) is threadedly connected to the limit block (17); Two support frames (7) for placing an upper mold and a lower mold are symmetrically arranged on the top of the workbench (1); the support frames (7) are slidably connected to the workbench (1) via a slide rail, and the bottom end of the support frame (7) is connected to the top end of the limit block (17); A component box (3) is fixed on one side of the workbench (1), and a box door (4) is rotatably connected to the front surface of the component box (3) via a rotating shaft, and a controller (5) is installed on the box door (4). A gas tank (18) is installed inside the component box (3), and a gas injection pipe (9) for injecting high-pressure gas into the mold is connected to one side of the gas tank (18), and an electromagnetic three-way valve (10) is installed on the gas injection pipe (9). A connecting pipe (12) for connecting two molds is provided on one side of the gas injection pipe (9), and a pressure gauge (11) for monitoring the internal air pressure of the mold is provided on the connecting pipe (12) relative to the gas injection pipe (9).

2. The injection mold airtightness detection device according to claim 1, characterized in that: A pressure gauge (19) is installed on one side of the gas tank (18), and a transparent observation window for observing the pressure gauge (19) is installed on the box door (4).

3. The injection mold airtightness detection device according to claim 1, characterized in that: The bottom of the workbench (1) is provided with an air compression mechanism for injecting air into the air tank (18) when the upper mold and the lower mold are closed or separated; The air compression mechanism comprises an outer air cylinder (25) and an inner air cylinder (26), the outer air cylinder (25) and the inner air cylinder (26) are both located at the bottom of the workbench (1), the outer air cylinder (25) and the inner air cylinder (26) are both provided with a pipeline fixing frame (28), the pipeline fixing frame (28) and the workbench (1) are fixed by bolts, the outer air cylinder (25) and the inner air cylinder (26) are both provided with a piston (2), a push rod (24) is fixed between the two pistons (2), the bottom of the limit block (17) is located below the workbench (1) and is fixed with a connecting plate (23), the connecting plate (23) is connected to the push rod (24); The ends of the outer air cylinder (25) and the inner air cylinder (26) are both connected to an air intake pipe (29) and an air charging pipe (13); an air intake check valve (30) is installed on the air intake pipe (29); an air charging check valve (31) is installed on the air charging pipe (13); and the end of the air charging pipe (13) is connected to the gas tank (18) through a pipeline.

4. The injection mold airtightness detection device according to claim 3, characterized in that: An air intake box (15) is fixed at the bottom of the workbench (1), and filters (21) for filtering dust are arranged at both ends of the air intake box (15), and the air intake pipe (29) is connected to the air intake box (15).

5. The injection mold airtightness detection device according to claim 4, characterized in that: The bottom of the gas tank (18) is connected to a pressure relief pipe (14), and a solenoid valve (20) is installed on the pressure relief pipe (14).

6. The injection mold airtightness detection device according to claim 5, characterized in that: The end of the pressure relief pipe (14) extends to the interior of the air intake box (15), and a blow pipe (22) is provided inside the air intake box (15). Both ends of the blow pipe (22) are close to the filter screen (21), and nozzles (27) are installed at both ends of the blow pipe (22).

7. The method for detecting air tightness of an injection mold according to claim 6, characterized in that: The following steps are involved: S1, placing the upper mold and the lower mold of the injection mold on their sides on two support frames (7) respectively through a hanger, and making the cavities of the upper mold and the lower mold face each other; S2, starting the motor (6) through the controller (5) to drive the bidirectional screw rod (16) to rotate, so that the two limit blocks (17) and the two support frames (7) move towards each other as a whole, thereby completing the mold closing operation of the upper mold and the lower mold; S3, after the upper mold and the lower mold of the injection mold are closed, the air injection pipe (9) is inserted into the feed port of the upper mold, and then the pressure gauge (11) is installed on the feed port of the lower mold; S4, opening the electromagnetic three-way valve (10) through the controller (5), allowing the high-pressure gas inside the gas tank (18) to enter the cavity between the upper mold and the lower mold through the gas injection pipe (9), observing the pressure value of the pressure gauge (11), and when the pressure value rises to the normal pressure value of the cavity, closing the electromagnetic three-way valve (10) to stop injecting gas into the injection mold; S5. Record the pressure value of the pressure gauge (11) when the electromagnetic three-way valve (10) is closed. After a period of time, observe the pressure value of the pressure gauge (11) again. If the pressure value before and after the pressure gauge (11) drops within the estimated range, it means that the sealing performance of the injection mold parting surface is good. On the contrary, if the pressure value before and after the pressure gauge (11) drops beyond the estimated range, it means that the sealing performance of the injection mold parting surface is poor. S6. After the test is completed, the electromagnetic three-way valve (10) is opened to discharge the gas inside the injection mold, and then the mold is separated.

8. The method for detecting air tightness of an injection mold according to claim 7, characterized in that: The pressure gauge (11) can be replaced by a pressure sensor.

9. The method for detecting air tightness of an injection mold according to claim 6, characterized in that: When measuring the air tightness of the mold water channel, follow the steps below: S1, placing the upper mold and the lower mold of the injection mold on their sides on two support frames (7) respectively through a hanger, and making the cavities of the upper mold and the lower mold face each other; S2, starting the motor (6) through the controller (5) to drive the bidirectional screw rod (16) to rotate, so that the two limit blocks (17) and the two support frames (7) move towards each other as a whole, thereby completing the mold closing operation of the upper mold and the lower mold; S3, after the upper mold and the lower mold of the injection mold are closed, the air injection pipe (9) is inserted into the water transport inlet of the lower mold, and then the connecting pipe (12) is respectively connected to the water transport outlet of the lower mold and the water transport inlet of the upper mold, and then the pressure gauge (11) is installed at the water transport outlet of the upper mold; S4, opening the electromagnetic three-way valve (10) through the controller (5) to allow the high-pressure gas in the gas tank (18) to enter the water transport pipeline of the injection mold through the gas injection pipe (9), observing the pressure value of the pressure gauge (11), and when the pressure value rises to the designed pressure value of the water transport pipeline, closing the electromagnetic three-way valve (10) to stop injecting gas into the water transport pipeline of the injection mold; S5. Record the pressure value of the pressure gauge (11) when the electromagnetic three-way valve (10) is closed. After a period of time, observe the pressure value of the pressure gauge (11) again. If the pressure value before and after the pressure gauge (11) drops within the estimated range, it means that the sealing performance of the water transport pipeline of the injection mold is good. On the contrary, if the pressure value before and after the pressure gauge (11) drops beyond the estimated range, it means that the sealing performance of the water transport pipeline of the injection mold is poor. S6. After the test is completed, the electromagnetic three-way valve (10) is opened to discharge the gas inside the injection mold, and then the mold is separated.

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