Injection mold cavity detection device and method

Abstract

The invention discloses an injection mold cavity detection device and method, and relates to the technical field of injection mold cavity detection, the injection mold cavity detection device comprises an injection mold and a detection support, the detection support is provided with a detection assembly, and the detection support is provided with a driving member for driving the detection assembly to rotate; the detection assembly comprises a detection ring and a telescopic ring piece, a gas receiving groove for receiving detection gas is formed in the detection ring, a built-in ring is wrapped in the detection ring, and a switching groove communicated with the gas receiving groove in a switching mode is formed in the built-in ring. Through intelligent switching of a switching groove and a vent groove of a built-in ring, automatic switching of detection modes is achieved, diagnosis can be completed without disassembling a mold, the detection time is greatly shortened, double mechanisms of heating softening and mechanical clearing are integrated, visual detection, air pressure diagnosis and physical dredging are integrated into a single tool, multifunctional integration is achieved, and the detection efficiency is improved. And the detection efficiency is improved, and the post-processing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of injection mold cavity detection, and particularly relates to an injection mold cavity detection device and method. Background Art

[0002] During the injection molding production process, the cleanliness and patency of the mold cavity and injection holes directly affect the product quality and production efficiency. Since the plastic melt repeatedly passes through the injection holes and runners under high temperature and high pressure, the residual plastic is prone to form blockages after cooling, especially when producing high-viscosity materials (such as PC, POM) or frequently changing materials. The blockage problem is more prominent. Manual detection and dredging require shutting down the machine to disassemble the mold, which not only takes a long time but also increases the unplanned downtime of the production line, affecting the overall production capacity. Existing detection devices usually only have the functions of blockage diagnosis or simple dredging, resulting in incomplete dredging or the need for multiple reworks. Summary of the Invention

[0003] The purpose of the present invention is to provide an injection mold cavity detection device and method, which can quickly judge the blockage situation of the injection hole through air pressure changes, realize the automatic conversion of the detection mode through the intelligent switching of the switching groove and the ventilation groove of the built-in ring, complete the diagnosis without disassembling the mold, greatly shorten the detection time, integrate the dual mechanisms of heating softening and mechanical cleaning, integrate visual detection, air pressure diagnosis and physical dredging in a single tooling, achieve multi-functional integration, improve the detection efficiency, and reduce the post-treatment cost at the same time.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An injection mold cavity detection device, including an injection mold and a detection bracket, a detection component is installed on the detection bracket, and a driving member for driving the detection component to rotate is provided on the detection bracket;

[0005] The detection component includes a detection ring and a telescopic ring member. An air intake groove for accessing detection gas is opened in the detection ring. A built-in ring is covered in the detection ring. A switching groove for switching and communicating with the air intake groove is opened in the built-in ring. One end of the detection ring is connected with a telescopic ring member. When the telescopic ring member expands and contracts, one end is butted against the inner cavity wall of the injection mold. The air intake groove and the switching groove are alternately communicated with the inside of the telescopic ring member. A cleaning structure is arranged in the telescopic ring member. The cleaning structure includes a puncture head for inserting into the injection hole and a mounting rod capable of driving the puncture head to expand and contract.

[0006] Further, one end of the telescopic ring member is connected with a sealing gasket that is pressed against the inner cavity wall of the mold. An inner sealing ring plate is arranged in the telescopic ring member in a fitting manner, and one end of the inner sealing ring plate is butted against the built-in ring.

[0007] Further, a first through hole is arranged at one end of the detection ring, and a second through hole that is intermittently communicated with the first through hole is arranged on the inner sealing ring plate.

[0008] Further, one end of the built-in ring is provided with a third through hole. The docking plate is connected to the inner sealing ring plate through a bearing. The docking plate is docked with the detection ring, and a fourth through hole that intermittently communicates with the third through hole is provided on the docking plate.

[0009] Further, a heater is provided inside the built-in ring, an installation rod is provided at the center of the built-in ring, and a plurality of spiral slices are annularly arranged on the surface of the puncture head.

[0010] Further, an air vent groove is provided on the inner sealing ring plate, and notches staggered with the air vent groove are provided on the telescopic ring member.

[0011] Further, a driving component is provided on the detection ring. The driving component includes a swing rod, a first gear and a second gear. The two ends of the swing rod are respectively sleeved with the first gear and the second gear. A double-headed motor is provided at the middle end of the swing rod, and the double-headed motor is hinged to the detection bracket.

[0012] Further, a gear meshing with the second gear is sleeved on the detection ring, and a rotating gear meshing with the first gear is provided inside the built-in ring.

[0013] Further, an air intake channel is provided inside the detection bracket. The air intake channel is communicated with the air connection groove. A movable plate is provided inside the air intake channel. A movable rod is covered with a telescopic film inside the air intake channel. One end of the movable rod is arranged outside the air intake channel. The movement of the movable plate drives the telescopic movement of the movable rod. A limit clamping plate is connected to one end of the movable rod, and a support plate for clamping with the limit clamping plate extends from one end of the swing rod.

[0014] This application also provides a method for detecting an injection mold cavity, including the following steps:

[0015] S1: During detection, when the injection mold is opened, the detection component is vertically inserted into the cavity between the injection molds. During the process of the injection mold being completely opened, the detection component rotates into a horizontal state inside the injection mold, and the camera detection system on its surface visually detects the cavity.

[0016] S2: When the detection component rotates into a horizontal state, its detection ring and telescopic ring member are coaxial with the injection hole. The detection component moves along the axis direction of the injection hole, so that the sealing gasket on the surface of the telescopic ring member fits with the inner wall of the cavity and wraps the injection hole inside.

[0017] S3: The air intake channel is connected to a gas, and the gas is injected into the air connection groove, so that the gas enters the telescopic ring member, and the air pressure change inside the telescopic ring member is detected. Whether the injection hole is blocked is judged according to the air pressure value.

[0018] S4: After the injection hole is blocked, first rotate the detection ring to align the ventilation groove with the notch on the telescopic ring part, and while being able to stagger the first through hole and the second through hole, make the third through hole and the fourth through hole communicate with each other, and the air intake groove and the switching groove communicate with each other. The gas is heated by the heater in the switching groove and then transported into the telescopic ring part to heat the blockage in the injection hole and soften it.

[0019] S5: After the blockage is softened, the detection ring rotates in the reverse direction to seal the inside of the telescopic ring part, and at the same time drives the puncture head to pierce into the blockage, and rotates inside it to entangle the blockage with the puncture head. At the same time, the air intake channel sucks air, and drives the mounting rod and the puncture head to move away from the injection hole direction, taking out the puncture head and the blockage entangled on its surface together to achieve the dredging of the injection hole.

[0020] The technical effects and advantages of the present invention:

[0021] 1. The linkage design of the detection ring and the telescopic ring part of the present invention: When the telescopic ring part is pressed against the cavity wall through the sealing gasket, the detection gas is injected into the air intake groove, and the blockage condition of the injection hole is quickly judged through the air pressure change. Through the intelligent switching of the switching groove and the ventilation groove of the inner ring, the automatic conversion of the detection mode is realized, and the diagnosis can be completed without disassembling the mold, greatly shortening the detection time. Integrating the dual mechanisms of heating and softening and mechanical cleaning, integrating visual detection, air pressure diagnosis and physical dredging into a single tooling, realizing multi-functional integration, improving the detection efficiency and reducing the later processing cost at the same time.

[0022] 2. The ventilation groove of the present invention communicates with the inside of the inner ring, and the gas needs to pass through the inside of the inner ring to enter the telescopic ring part to heat and soften the blockage in the injection hole. The heated gas can be discharged from the notch communicating with the outside, realizing the continuous delivery of the heating air flow into the telescopic ring part. When softened, the spiral slicer takes out the softened material through the entanglement effect, and at the same time the air intake channel sucks air to enhance the cleaning effect, greatly improving the dredging success rate.

[0023] 3. The present invention sets a driving component that can utilize the conversion between gas injection and air extraction to change the meshing state of the first gear and the second gear. When in the gas injection state, the second gear is in the meshing state with the gear on the detection ring, and the driving component is used to drive the detection ring to rotate for the air flow diversion. When in the air extraction state, it meshes with the rotating gear, and the driving component is used to drive the rotating gear to rotate, which is used to drive the spiral slicer wound with the blockage to pull back and take out the object from the injection hole. The working mode can be switched by using the pressure change of a single gas source, greatly improving the integration degree and response speed of the device, eliminating the complex electric control switching device, and realizing function conversion only through the positive and negative changes of the air pressure, improving the driving flexibility and reducing the cost problem caused by additional driving. Description of the Drawings

[0024] Figure 1 Schematic diagram of the overall structure of the present invention;

[0025] Figure 2 Schematic diagram of the rotating structure of the detection component of the present invention;

[0026] Figure 3 Schematic diagram of the detection bracket and the detection component of the present invention;

[0027] Figure 4 For the present invention Figure 3 Enlarged view of part A;

[0028] Figure 5 Half-sectional view of the detection component of the present invention;

[0029] Figure 6 For the present invention Figure 5 Enlarged view of part B;

[0030] Figure 7 Exploded sectional view of the detection component of the present invention;

[0031] Figure 8 Schematic diagram of the driving component of the present invention;

[0032] Figure 9 Half-sectional view of the internal structure of the detection bracket of the present invention.

[0033] In the figure:

[0034] 1. Detection bracket; 11. Air inlet channel; 12. Movable plate; 13. Movable rod; 131. Limit clamping plate; 2. Detection component; 21. Detection ring; 211. Air connection groove; 212. First through hole; 22. Telescopic ring member; 221. Sealing gasket; 222. Inner sealing ring plate; 2221. Second through hole; 2222. Ventilation groove; 23. Built-in ring; 231. Third through hole; 232. Rotating gear; 233. Switching groove; 24. Cleaning structure; 241. Piercing head; 242. Mounting rod; 25. Docking plate; 251. Fourth through hole; 3. Driving component; 31. Rocking rod; 32. First gear; 33. Second gear. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0036] To better understand an injection mold cavity detection device provided in this embodiment, the following first briefly introduces the existing treatment for blockages in injection mold cavities. Most of them are mechanically dredged, such as with drills, which are prone to scratching the inner wall of the mold cavity or injection holes. Prolonged use will cause an increase in the surface roughness of the runner, thereby leading to defective problems such as flash and burrs. The air pressure detection device is often separated from the dredging module, and manual tooling switching is required, making it impossible to achieve closed-loop processing. This solution aims to solve the above technical problems. The embodiment of this application provides an injection mold cavity detection device with an interlocking design between the detection ring 21 and the telescopic ring member 22: when the telescopic ring member 22 is pressed against the cavity wall through the gasket 221, the detection gas is injected into the air intake groove 211, and the blockage condition of the injection hole is quickly judged by the air pressure change. Through the intelligent switching between the switching groove 233 of the built-in ring 23 and the ventilation groove 2222, the automatic conversion of the detection mode is realized, and the diagnosis can be completed without disassembling the mold. The detection time is greatly shortened. The dual mechanisms of heating and softening and mechanical cleaning are integrated, and visual detection, air pressure diagnosis, and physical dredging are integrated into a single tooling, achieving multi-functional integration. While improving the detection efficiency, the post-treatment cost is reduced.

[0037] Embodiment 1: Refer to Figure 1 - Figure 7 , which is the first embodiment of the present invention, provides an injection mold cavity detection device, including an injection mold and a detection bracket 1. The detection bracket 1 is configured on a three-axis moving mechanism for adjusting the movement of the detection component 2 to facilitate the precise alignment of the detection component 2 with the injection mold. A detection component 2 is installed on the detection bracket 1, and a driving member for driving the detection component 2 to rotate is provided on the detection bracket 1;

[0038] The detection component 2 includes a detection ring 21 and a telescopic ring member 22. An air intake groove 211 for accessing the detection gas is formed in the detection ring 21. An inner ring 23 is covered inside the detection ring 21. A switching groove 233 that is switched and communicated with the air intake groove 211 is formed in the inner ring 23. A positioning notch is provided on the outer wall of the inner ring 23, and an inner groove corresponding to the positioning notch is formed on the inner wall of the inner ring of the detection ring 21. When the detection ring 21 rotates, the positioning notch and the inner groove can be aligned and communicated with each other, and are closed when staggered. One end of the detection ring 21 is connected to the telescopic ring member 22. When the telescopic ring member 22 expands and contracts, one end is butted against the inner cavity wall of the injection mold. The air intake groove 211 and the switching groove 233 are staggered and communicated with the inside of the telescopic ring member 22. A cleaning structure 24 is provided inside the telescopic ring member 22. The cleaning structure 24 includes a puncture head 241 for inserting into the injection hole and a mounting rod 242 capable of driving the puncture head 241 to expand and contract. When a blockage is detected, the heater of the inner ring 23 heats the gas to the melting point of the plastic, and the hot air is introduced into the telescopic ring member 22 through the switching groove 233 to soften the blockage. Subsequently, the puncture head 241 pierces into the blockage, and its spiral slicing 2411 takes out the softened material through the entanglement effect. At the same time, the air extraction of the air intake passage 11 enhances the cleaning effect and avoids the risk of secondary blockage. By rotating the detection ring 21 and the telescopic ring member 22, the air intake groove 211 is communicated with the inside of the telescopic ring member 22, and rotation can also make the inside of the telescopic ring member 22 in a sealed state when it is pressed, providing a sealed environment for air pressure detection, and the inside of the telescopic ring member 22 can be closed while rotating and ventilating.

[0039] One end of the telescopic ring member 22 is connected with a sealing gasket 221 which is pressed against the inner cavity wall of the mold. An inner sealing ring plate 222 is arranged inside the telescopic ring member 22 in a fitting manner. One end of the inner sealing ring plate 222 is butted against the built-in ring 23. One end of the detection ring 21 is provided with a first through hole 212. The inner sealing ring plate 222 is provided with a second through hole 2221 which is intermittently communicated with the first through hole 212. One end of the built-in ring 23 is provided with a third through hole 231. The inner sealing ring plate 222 is connected with a docking plate 25 through a bearing. The docking plate 25 is butted against the detection ring 21. The docking plate 25 is provided with a fourth through hole 251 which is intermittently communicated with the third through hole 231. A heater is arranged inside the built-in ring 23. A mounting rod 242 is arranged at the center of the built-in ring 23. A plurality of spiral slices 2411 are arranged in a circumferential array on the surface of the puncture head 241. An air vent groove 2222 is formed on the inner sealing ring plate 222. The telescopic ring member 22 is provided with notches which are arranged in a staggered manner with the air vent groove 2222. The cleaning state can be adjusted according to the detection result. When cleaning is required, the detection ring 21 and the telescopic ring member 22 rotate reversely, so that the inside and the outside of the telescopic ring member 22 are connected. At the same time of connection, the air vent groove 2222 is communicated with the inside of the built-in ring 23. The gas needs to pass through the inside of the built-in ring 23 to enter the telescopic ring member 22, so as to heat and soften the blockage in the injection hole. The heated gas can be discharged from the notches communicated with the outside, so as to realize continuous delivery of the heated air flow into the telescopic ring member 22. After softening, the spiral slices 2411 take out the softened material through the entanglement effect. At the same time, the air intake channel 11 sucks air to enhance the cleaning effect, greatly improving the dredging success rate.

[0040] The present application provides a detection method for an injection mold cavity, including the following steps:

[0041] S1: During detection, when the injection mold is opened, the detection assembly 2 is vertically inserted into the cavity between the injection molds. During the process of the injection mold being completely opened, the detection assembly 2 rotates into a horizontal state inside the injection mold, and the camera detection system on its surface visually detects the cavity.

[0042] S2: When the detection assembly 2 rotates into a horizontal state, its detection ring 21 and telescopic ring member 22 are coaxial with the injection hole. The detection assembly 2 moves along the axis direction of the injection hole, so that the sealing gasket 221 on the surface of the telescopic ring member 22 fits against the inner wall of the cavity and wraps the injection hole inside.

[0043] S3: The air intake channel 11 accesses gas, injects gas into the docking air groove 211, so that the gas enters the telescopic ring member 22, and detects the air pressure change inside the telescopic ring member 22, and judges whether the injection hole is blocked according to the air pressure value.

[0044] S4: After the injection hole is blocked, first rotate the detection ring 21 to align the ventilation groove 2222 with the notch on the telescopic ring member 22. While enabling the first through hole 212 and the second through hole 2221 to be staggered, the third through hole 231 and the fourth through hole 251 communicate with each other, and the air intake groove 211 and the switching groove 233 communicate with each other. The gas is heated by the heater in the switching groove 233 and then transported into the telescopic ring member 22 to heat the blockage in the injection hole and soften it.

[0045] S5: After the blockage is softened, the detection ring 21 rotates in the reverse direction to seal the inside of the telescopic ring member 22, and at the same time drives the puncture head 241 to pierce into the blockage. It rotates inside the blockage to entangle the blockage with the puncture head 241. At the same time, the air intake passage 11 sucks air, and drives the mounting rod 242 and the puncture head 241 to move away from the injection hole direction, taking out the puncture head 241 and the blockage entangled on its surface together to achieve the dredging of the injection hole.

[0046] Embodiment 2: Refer to Figure 8 - Figure 9 , which is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that a driving component 3 is provided on the detection ring 21. The driving component 3 includes a swing rod 31, a first gear 32 and a second gear 33. The two ends of the swing rod 31 are respectively sleeved with the first gear 32 and the second gear 33. A double-headed motor is arranged at the middle end of the swing rod 31. The double-headed motor is hinged on the detection bracket 1. A gear meshing with the second gear 33 is sleeved on the detection ring 21. A rotating gear 232 meshing with the first gear 32 is arranged inside the built-in ring 23. An air intake passage 11 is opened in the detection bracket 1. The air intake passage 11 communicates with the air intake groove 211. A movable plate 12 is arranged in the air intake passage 11. A movable rod 13 is arranged in the air intake passage 11 through a telescopic film. One end of the movable rod 13 is arranged outside the air intake passage 11. The movement of the movable plate 12 drives the telescopic movement of the movable rod 13. One end of the movable rod 13 is connected with a limit clamping plate 131. A support plate for clamping with the limit clamping plate 131 extends from one end of the swing rod 31. By setting the driving component 3, the conversion between gas injection and air extraction can be utilized to change the meshing state of the first gear 32 and the second gear 33. When in the gas injection state, the second gear 33 is in a meshing state with the gear on the detection ring 21, and the driving component 3 is used to drive the detection ring 21 to rotate for air flow diversion. When in the air extraction state, it meshes with the rotating gear 232, and the driving component 3 is used to drive the rotating gear 232 to rotate, for driving the spiral slice 2411 wound with the blockage to be pulled back and taking out the object from the injection hole. The working mode can be switched only by the pressure change of a single air source, greatly improving the integration and response speed of the device, eliminating the complex electric control switching device, and realizing function conversion only through the positive and negative changes of air pressure, improving the driving flexibility and also reducing the cost problem caused by additional driving.

[0047] Specifically, the rotating gear 232 is movably installed with the built-in ring 23 and is threadedly connected to the mounting rod 242. The mounting rod 242 is limited by the inner plate of the built-in ring 23 and can only move but not rotate. When the rotating gear 232 rotates and the system is in the gas injection state, the gas pushes the movable plate 12 to move, causing the movable rod 13 to drive the limit clamping plate 131 to push the swing rod 31 to rotate. At this time, the double-headed motor drives the second gear 33 to mesh with the gear of the detection ring 21, driving the detection ring to rotate to achieve the switching of the air flow channel, such as aligning the air receiving groove 211 with the switching groove 211. When switched to the air extraction state, the negative pressure causes the movable plate 12 to reset and pull back, and the limit clamping plate 131 drives the swing rod 31 to incline in the reverse direction. The first gear 32 then meshes with the rotating gear 232. Under the action of the thread, the rotation of the rotating gear 232 is converted into a linear motion of the mounting rod 242 through the thread drive, driving the puncture head 241 to accurately withdraw from the injection hole.

[0048] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An injection mold cavity detection device, comprising an injection mold and a detection bracket (1), characterized in that: The detection bracket (1) is provided with a detection component (2), and the detection bracket (1) is provided with a driving member for driving the detection component (2) to rotate; The detection assembly (2) comprises a detection ring (21) and a telescopic ring member (22); a gas receiving groove (211) for receiving detection gas is provided in the detection ring (21); a built-in ring (23) is covered in the detection ring (21); a switching groove (233) is provided in the built-in ring (23) for switching and communicating with the gas receiving groove (211); one end of the detection ring (21) is connected to the telescopic ring member (22); when the telescopic ring member (22) is telescoped, one end of the telescopic ring member (22) is butted against the inner cavity wall of the injection mold; the gas receiving groove (211) and the switching groove (233) are staggered and communicate with the inside of the telescopic ring member (22); a cleaning structure (24) is provided in the telescopic ring member (22); the cleaning structure (24) comprises a puncture head (241) for inserting into the injection hole, and a mounting rod (242) capable of driving the puncture head (241) to telescope.

2. The injection mold cavity detection device according to claim 1, characterized in that: One end of the telescopic ring (22) is connected to a sealing pad (221) pressed against the inner wall of the mold cavity, and an inner sealing ring plate (222) is provided inside the telescopic ring (22) by bonding, and one end of the inner sealing ring plate (222) is butt-jointed with the built-in ring (23).

3. The injection mold cavity detection device according to claim 2, characterized in that: A first through hole (212) is provided at one end of the detection ring (21), and a second through hole (2221) intermittently communicating with the first through hole (212) is provided on the inner sealing ring plate (222).

4. The injection mold cavity detection device according to claim 3, characterized in that: A third through hole (231) is provided at one end of the built-in ring (23); the inner sealing ring plate (222) is connected to a docking plate (25) via a bearing; the docking plate (25) is docked with the detection ring (21); and a fourth through hole (251) intermittently communicates with the third through hole (231) is provided on the docking plate (25).

5. The injection mold cavity detection device according to claim 4, characterized in that: A heater is arranged inside the built-in ring (23), a mounting rod (242) is arranged at the center of the built-in ring (23), and a plurality of spiral slices (2411) are arranged in an annular array on the surface of the puncture head (241).

6. The injection mold cavity detection device according to claim 5, characterized in that: The inner sealing ring plate (222) is provided with a ventilation groove (2222), and the telescopic ring member (22) is provided with a notch arranged in an alternating manner with the ventilation groove (2222).

7. The injection mold cavity detection device according to claim 6, characterized in that: The detection ring (21) is provided with a driving assembly (3), the driving assembly (3) comprising a rocking arm (31), a first gear (32) and a second gear (33), the two ends of the rocking arm (31) are respectively sleeved with the first gear (32) and the second gear (33), the middle end of the rocking arm (31) is provided with a double-headed motor, and the double-headed motor is hingedly arranged on the detection bracket (1).

8. The injection mold cavity detection device according to claim 7, characterized in that: The detection ring (21) is sleeved with a gear meshing with the second gear (33), and the built-in ring (23) is provided with a rotating gear (232) meshing with the first gear (32).

9. The injection mold cavity detection device according to claim 8, characterized in that: The detection bracket (1) is provided with an air intake channel (11), the air intake channel (11) is communicated with the air receiving groove (211), a movable plate (12) is provided in the air intake channel (11), a movable rod (13) is provided in the air intake channel (11) through a telescopic film, one end of the movable rod (13) is provided outside the air intake channel (11), the movable plate (12) moves to drive the movable rod (13) to extend and retract, one end of the movable rod (13) is connected to a limit clamping plate (131), and one end of the rocking rod (31) is extended with a support plate that is clamped with the limit clamping plate (131).

10. The method for detecting the cavity of an injection mold according to claim 9, characterized in that: The steps include: S1: During the inspection, the inspection component (2) is vertically inserted into the cavity between the injection molds during the process of opening the injection molds. During the process of fully opening the injection molds, the inspection component (2) is rotated into a horizontal state in the injection molds, and a camera inspection system on its surface performs visual inspection of the cavity. S2: When the detection component (2) rotates to a horizontal state, its detection ring (21) and the telescopic ring (22) are coaxial with the injection hole, and the detection component (2) moves along the axis of the injection hole, so that the sealing gasket (221) on the surface of the telescopic ring (22) fits with the inner wall of the cavity and covers the injection hole inside; S3: connecting the gas to the air inlet channel (11), injecting gas into the air groove (211), allowing the gas to enter the telescopic ring (22), detecting the change in the air pressure in the telescopic ring (22), and judging whether the injection hole is blocked according to the air pressure value; S4: When the injection hole is clogged, the detection ring (21) is first rotated to align the vent groove (2222) with the notch on the telescopic ring (22), and the first through hole (212) and the second through hole (2221) are staggered, while the third through hole (231) and the fourth through hole (251) are interconnected, and the air receiving groove (211) and the switching groove (233) are interconnected. The gas is heated by the heater in the switching groove (233) and then transported to the telescopic ring (22), thereby heating the blockage in the injection hole and softening it. S5: After the obstruction softens, the detection ring (21) reverses to seal the inside of the telescopic ring (22) and drives the puncture head (241) to penetrate into the obstruction and rotate inside the detection ring (21) so that the obstruction and the puncture head (241) are entangled together. At the same time, the air inlet channel (11) is evacuated and the mounting rod (242) and the puncture head (241) are driven to move away from the injection hole, so that the puncture head (241) and the obstruction entangled on its surface are taken out together, thereby clearing the injection hole.

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