Automatic detection and conveying line for injection-molded products

Abstract

The application belongs to the technical field of injection molding part detection, and particularly relates to an automatic detection conveying line for injection molding products. In view of the low efficiency in wall thickness detection of barrel-shaped injection molding parts in the prior art, the following scheme is proposed. The scheme comprises a liquid storage tank in the shape of a cuboid with an upward opening. The left and right sides of the liquid storage tank are respectively provided with an equal-height feeding conveyor frame one and a discharging conveyor frame two. A same conveying belt is arranged between the feeding conveyor frame one and the discharging conveyor frame two. The length and width of the liquid storage tank are both greater than the diameter of the barrel-shaped injection molding part, and the depth of the liquid storage tank is greater than the depth of the barrel-shaped injection molding part. The barrel-shaped injection molding part to be detected can be subjected to uniform extrusion force from outside to inside during detection. Once the thickness of a certain position of the barrel body is substandard, the position will be extruded inward to protrude. At this time, the detection line one will be extruded to contact the detection line two at the protruding position, and then the alarm circuit is connected, indicating that the thickness of the position is substandard.

Description

Technical Field

[0001] This invention relates to the field of injection molded part inspection technology, and in particular to an automatic inspection and conveying line for injection molded products. Background Technology

[0002] Container-shaped injection molded parts are typically large or medium-sized plastic injection molded products, widely used in packaging, storage, and chemical containers. Due to their special geometry and the requirements of their usage environment, quality inspection is particularly important.

[0003] Existing technologies typically require testing the wall thickness and leak-proof performance of injection molded products. However, current testing methods involve sampling samples and using a micrometer to test multiple wall thickness locations. This method is not only slow but also cannot guarantee that every injection molded part in a batch can be tested. To address these shortcomings, we propose a novel automated testing and conveying line for injection molded products. Summary of the Invention

[0004] To overcome the aforementioned shortcomings in the prior art, the present invention aims to provide a novel automatic detection and conveying line capable of distinguishing the thickness of injection molded parts by utilizing the difference in compressive strength resulting from uneven thickness caused by pressure generated from the outside to the inside. This invention provides an automatic inspection and conveying line for injection molded products, comprising a liquid storage tank with an upward-opening rectangular box structure. A feeding conveyor frame one and an unloading conveyor frame two of equal height are respectively arranged on the left and right sides of the liquid storage tank, and a common conveyor belt connects the feeding conveyor frame one and the unloading conveyor frame two. The length and width of the liquid storage tank are both greater than the diameter of the barrel-shaped injection molded part, and the depth of the liquid storage tank is greater than the depth of the barrel-shaped injection molded part. The liquid storage tank contains a high-density detection liquid. An L-shaped main support frame extending vertically upwards from the rear side of the liquid storage tank is fixed, and a vertically downward-extending electric push rod is fixed to the top of the L-shaped main support frame. A movable pressure frame is fixed to the bottom end of the extension rod of the electric push rod, and the movable pressure frame includes an arched main beam fixed to the bottom end of the extension rod of the electric push rod. A folding frame is fixed to the top end of the arched main beam. Furthermore, two cantilever arms extending towards the middle of the upper part of the storage tank are fixed at the top of the folding frame. A thin-walled detection mechanism is fixed between the ends of the two cantilever arms. The thin-walled detection mechanism includes an anti-slip bearing assembly fixed between the ends of the cantilever arms. A vertical transmission tube is rotatably connected in the middle of the anti-slip bearing assembly. A C-shaped fixing ring is fixed near the bottom of the outer circumference of the transmission tube. A herringbone detection frame is set in the notch of the C-shaped fixing ring. A detection line one is fixed between the three ends of the herringbone detection frame and attached to the inner wall of the barrel-shaped injection molded part. When the barrel-shaped injection molded part is not under force, the detection line one does not contact the barrel wall. A detection line two parallel to the detection line one is also set at the three ends of the herringbone detection frame. The detection line one is located between the inner wall to be detected and the detection line two. The detection line one and the detection line two are connected in series in the alarm circuit.

[0005] Preferably, the feeding conveyor frame one and the discharging conveyor frame two are respectively provided with symmetrical tensioning mechanisms at the ends near the liquid storage tank. One of the tensioning mechanisms includes two parallel and identically sized guide rollers, a first guide roller and a second guide roller, located at the end of the feeding conveyor frame one near the liquid storage tank. The gap between the first guide roller and the second guide roller is equal to three times the thickness of the conveyor belt, and the axis of the first guide roller is perpendicular to the conveying direction of the conveyor belt. The bottom of the liquid storage tank is fitted with a deep box with an upward-opening cuboid box structure near both the left and right ends. Vertical guide slide rods are fixed at the bottom of the deep box at both the front and rear ends. Symmetrical bearing seats are slidably sleeved on both sets of guide slide rods, and the same tensioning roller is provided between the two bearing seats.

[0006] Preferably, a counterweight is fixed to the lower surface of each of the four bearing seats. The movable pressure frame also includes round rods fixed at the two ends of the arched main beam at the same horizontal height and parallel to each other. The distance between the two steering rollers is greater than the distance between the two round rods. The round rods are parallel to the steering rollers. The distance between the two round rods is greater than the diameter of the barrel opening of the barrel-shaped injection molded part. Symmetrical arched pressure rods are fixed above the two ends of the two round rods. The tops of the two arched pressure rods are reserved with arc-shaped parts that bend towards the middle. The distance between the two arc-shaped parts is less than the diameter of the barrel opening of the barrel-shaped injection molded part.

[0007] Preferably, the round rod is made of a wear-resistant material, and the outer wall of the round rod is polished to reduce wear on the surface of the conveyor belt.

[0008] Preferably, a clamping mechanism is provided between the two arched pressure rods, and the clamping mechanism includes T-shaped pieces fixed above the two arc-shaped parts and symmetrically arranged. A driving toothed pulley and a driven toothed pulley are respectively provided above the far ends of the two T-shaped pieces. The same toothed conveyor belt is wound between the driving toothed pulley and the driven toothed pulley. A servo motor is also fixed at the top of the folding frame, and the top of the output shaft of the servo motor is fixed to the axle end of the driving toothed pulley through a coupling. The far ends of the two T-shaped pieces are respectively slidably connected to symmetrical centering clamping blocks, and two parallel anti-torsion inserts are reserved on the opposite side of the two centering clamping blocks. The anti-torsion inserts are slidably inserted into the corresponding T-shaped pieces, and the two centering clamping blocks are respectively fixed on the two sides of the toothed conveyor belt moving in opposite directions.

[0009] Preferably, each of the two centering clamping blocks has a pre-reserved arc-shaped surface on one side, and the size of the arc-shaped surface is adapted to the diameter of the barrel-shaped injection molded part.

[0010] Preferably, a C-shaped sliding ring is slidably connected to the outer wall of the transmission tube near its bottom end, and a connecting rod is hinged in the groove of the C-shaped sliding ring. The other end of the connecting rod is hinged to the support rod of the herringbone detection frame. Symmetrical permanent magnets are fixed to the front and rear sides of the C-shaped sliding ring, and electromagnets are fixed to the front and rear sides of the anti-slip bearing assembly. An L-shaped hanging plate is provided on the side of the anti-slip bearing assembly away from the electromagnet, and a magnetic column is fixed to the bottom end of the L-shaped hanging plate. The bottom end of the magnetic column repels the top end of the permanent magnet. A driven bevel gear is fixed to the top end of the transmission tube, and a reduction motor is fixed to the upper surface of the two cantilever frames near the anti-slip bearing assembly. A driving gear that meshes with the driven bevel gear is fixed to the top end of the output shaft of the reduction motor.

[0011] Preferably, a sliding contact is slidably connected to the inner wall of the bottom end of the transmission tube, and a return spring is fixed to the top of the sliding contact. A C-shaped retaining ring is fixed to the top of the return spring. A metal sheet and a plastic sheet are fixed to the inner circumference of the transmission tube near the notch of the C-shaped retaining ring. An elastic contact sheet is fixed to the top of the sliding contact and pressed on the plastic sheet. The elastic contact sheet and the metal sheet are connected in series in the bottom contact circuit.

[0012] Preferably, the feeding conveyor frame includes a front side plate and a rear side plate, and symmetrical centering guard plates are fixed between the front side plate and the rear side plate respectively. The two centering guard plates form a trumpet shape, which can center the incoming material.

[0013] Preferably, a base is fixed to the rear side of the liquid storage tank, and the bottom end of the L-shaped main support frame is fixed above the base.

[0014] The beneficial effects of this invention are as follows: 1. By setting up a detection line that adheres to the inner wall of the barrel-shaped injection molded part during testing without contacting the barrel wall under normal conditions, and in conjunction with a high-density detection liquid, the barrel-shaped injection molded part to be tested can be subjected to uniform extrusion pressure from the outside to the inside during testing. If the thickness of a certain position of the barrel is not up to standard, that position will be squeezed inward and bulge. At that time, as the herringbone detection frame rotates along the wall, when it reaches the bulging position, the detection line one will be squeezed by the bulging position to contact the detection line two, thereby activating the alarm circuit, indicating that the thickness at that position is not up to standard.

[0015] 2. By setting a tensioning roller that slides between the deepening box and the roll gap, it can be ensured that the conveyor belt on the working section of the platform is always taut during use. Moreover, when the section of the conveyor belt above the liquid storage tank is raised to a horizontal state, the liquid that does not have time to slide off its surface will not immediately flow to the feed end or the discharge end, but will flow back into the liquid storage tank from the roll gap between the first and second steering rollers.

[0016] 3. By using the electromagnet and magnetic column 2, the herringbone inspection frame can be erected as a whole when the barrel-shaped injection molded part is not centered, thus protecting inspection line 1 and inspection line 2. Moreover, after the inspection stops, the two permanent magnets 1 stop exactly below the electromagnet under the action of repulsive force, ensuring that the herringbone inspection frame can be properly retracted and extended. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an automatic inspection and conveying line for injection molded products during inspection, as proposed in this invention. Figure 2 This is a top view of an automatic inspection and conveying line for injection molded products during inspection, as proposed in this invention. Figure 3 This invention proposes an automatic inspection and conveying line for injection molded products. Figure 2Schematic diagram of the cross-sectional structure along line AA; Figure 4 This invention proposes an automatic inspection and conveying line for injection molded products. Figure 3 Enlarged structural diagram at point B; Figure 5 This is a schematic diagram of the structure of an automatic inspection and conveying line for injection molded products before inspection, as proposed in this invention. Figure 6 This is a cross-sectional structural diagram of an automatic inspection and conveying line for injection molded products proposed in this invention before inspection; Figure 7 This is a schematic diagram of the clamping mechanism in an automatic inspection and conveying line for injection molded products proposed in this invention; Figure 8 This is a schematic diagram of the thin-walled detection mechanism in an automatic inspection and conveying line for injection molded products proposed in this invention.

[0018] In the diagram: 1. Storage tank; 2. Deepened tank; 3. Discharge conveyor frame two; 4. Conveyor belt; 5. Moving pressure frame; 501. Arched pressure bar; 502. Round bar; 6. Folding frame; 7. Servo motor; 8. Anti-slip bearing assembly; 9. Cantilever frame; 10. L-shaped main support frame; 1001. Base; 11. Electric push rod; 12. Barrel-shaped injection molded part; 13. Centered guard plate; 14. Feeding conveyor frame one; 15. Directional roller one; 16. Directional roller two; 17. Guide slide bar; 18. 181. Transmission pipe; 182. C-shaped fixing ring; 183. Sliding contact block; 19. Herringbone detection frame; 20. Tensioning roller; 21. Detection line one; 22. Detection line two; 23. Metal sheet; 24. Elastic contact sheet; 25. Bearing seat; 26. Counterweight block; 27. Driven toothed pulley; 28. Centering clamping block; 29. ​​Anti-torsion rod; 30. Toothed conveyor belt; 31. Gear motor; 32. Electromagnet; 33. L-shaped hanging plate; 34. Permanent magnet one; 35. C-shaped sliding ring. Detailed Implementation

[0019] The technical solutions 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.

[0020] In this embodiment, refer to Figures 1-8An automatic inspection and conveying line for injection molded products includes a liquid storage tank 1 with an upward-opening rectangular box structure. A feeding conveyor frame 14 and an unloading conveyor frame 3 of equal height are respectively installed on the left and right sides of the liquid storage tank 1. A common conveyor belt 4 is installed between the feeding conveyor frame 14 and the unloading conveyor frame 3. The conveyor belt 4 itself can filter high-density inspection liquid. The length and width of the liquid storage tank 1 are both greater than the diameter of the barrel-shaped injection molded part 12, and the depth of the liquid storage tank 1 is greater than the depth of the barrel-shaped injection molded part 12. The liquid storage tank 1 contains high-density inspection liquid. An L-shaped main support frame 10 extending vertically upwards from the rear side of the liquid storage tank 1 is fixed. A vertically downward-extending electric push rod 11 is fixed to the top of the L-shaped main support frame 10. A movable pressure frame 5 is fixed to the bottom end of the extension rod of the electric push rod 11. The movable pressure frame 5 includes an arched main beam fixed to the bottom end of the extension rod of the electric push rod 11. A folding frame 6 is fixed to the top of the arched main beam. Two cantilever frames 9 are fixed at the top of the folding frame 6, extending to the middle position above the liquid storage tank 1. A thin-walled detection mechanism is fixed between the ends of the two cantilever frames 9. The thin-walled detection mechanism includes an anti-slip bearing assembly 8 fixed between the ends of the cantilever frames 9. A vertical transmission tube 18 is rotatably connected in the middle of the anti-slip bearing assembly 8. A C-shaped fixing ring 181 is fixed near the bottom of the outer circumference of the transmission tube 18. A herringbone detection frame 19 is provided in the notch of the C-shaped fixing ring 181. A detection line 11 is fixed between the three ends of the herringbone detection frame 19 and is attached to the inner wall of the barrel-shaped injection molded part 12. When the barrel-shaped injection molded part 12 is not under force, the detection line 11 does not contact the barrel wall. A detection line 22 parallel to the detection line 11 is also provided at the three ends of the herringbone detection frame 19. The detection line 121 is located between the inner wall to be detected and the detection line 22. The detection line 121 and the detection line 22 are connected in series in the alarm circuit. Specifically, by setting up a detection line 21 that adheres to the inner wall of the barrel-shaped injection molded part 12 during testing but does not contact the barrel wall under normal conditions, and in conjunction with the setting of a high-density detection liquid, the barrel-shaped injection molded part 12 to be tested can be subjected to uniform extrusion pressure from the outside to the inside during testing. If the thickness of a certain position of the barrel is not up to standard, that position will be squeezed inward and bulge. At that time, as the herringbone detection frame 19 rotates along the wall, when it reaches the bulging position, the detection line 21 will be squeezed by the bulging position to contact the detection line 22, thereby activating the alarm circuit, which indicates that the thickness at that position is not up to standard.

[0021] The feeding conveyor frame 14 and the discharging conveyor frame 2 are respectively equipped with symmetrical tensioning mechanisms at their ends near the liquid storage tank 1. One of the tensioning mechanisms includes two parallel and identically heighted guide rollers 15 and 16 located at the end of the feeding conveyor frame 14 near the liquid storage tank 1. The gap between guide rollers 15 and 16 is equal to three times the thickness of the conveyor belt 4, and the axis of guide roller 15 is perpendicular to the conveying direction of the conveyor belt 4. The bottom of the liquid storage tank 1 is fitted with a deep box 2 with an upward-opening rectangular box structure near both the left and right ends, and the bottom of the deep box 2 is located at the front. Both ends are fixed with vertical guide slide rods 17. Each of the front and rear guide slide rods 17 is slidably sleeved with a symmetrical bearing seat 25. The same tension roller 20 is set between the two bearing seats 25. By setting the tension roller 20 which is slidably connected to the deepening box 2 and the bottom of the roller gap, it can be ensured that the conveyor belt 4 on the working section of the table is always taut during use. Moreover, when the section of conveyor belt 4 above the liquid storage tank 1 is raised to a horizontal state, the liquid that does not have time to slide off its surface will not immediately flow to the feed end or the discharge end, but will flow back into the liquid storage tank 1 from the roller gap of the first guide roller 15 and the second guide roller 16.

[0022] Reference Figure 3 and Figure 6 The lower surfaces of the four bearing seats 25 are all fixed with counterweights 26. The movable pressure frame 5 also includes round rods 502 that are horizontally level and parallel to each other at both ends of the arched main beam. The distance between the two steering rollers 16 is greater than the distance between the two round rods 502. The round rods 502 are parallel to the steering rollers 15. The distance between the two round rods 502 is greater than the diameter of the barrel opening of the barrel-shaped injection molded part 12. The upper ends of the two round rods 502 are respectively fixed with symmetrical arched pressure rods 501. The top of the two arched pressure rods 501 are reserved with arc-shaped parts that bend towards the middle. The distance between the two arc-shaped parts is less than the diameter of the barrel opening of the barrel-shaped injection molded part 12. In this way, when the movable pressure frame 5 is pressed down as a whole, the two arc-shaped parts will press the barrel opening of the barrel-shaped injection molded part 12 tightly until the barrel body is pressed into the high-density detection liquid.

[0023] In this invention, the round rod 502 is made of wear-resistant material, and the outer wall of the round rod 502 is polished, which can reduce the wear on the surface of the conveyor belt 4.

[0024] Reference Figure 7A clamping mechanism is also provided between the two arched pressure rods 501, and the clamping mechanism includes T-shaped pieces fixed above the two arc-shaped parts symmetrically. A driving toothed pulley and a driven toothed pulley 27 are respectively provided above the far ends of the two T-shaped pieces. The same toothed conveyor belt 30 is wound between the driving toothed pulley and the driven toothed pulley 27. A servo motor 7 is also fixed to the top of the folding frame 6, and the top of the output shaft of the servo motor 7 is fixed to the axle end of the driving toothed pulley via a coupling. The far ends of the two T-shaped pieces slide... The moving connection has symmetrical centering clamping blocks 28, and two parallel anti-torsion rods 29 are reserved on each side of the two centering clamping blocks 28. The anti-torsion rods 29 are slidably inserted into the corresponding T-shaped parts, and the two centering clamping blocks 28 are respectively fixed on the two sides of the toothed conveyor belt 30 moving in opposite directions. By setting two centering clamping blocks 28 moving in opposite directions, the barrel-shaped injection molded part 12 can be centered and fixed before wall thickness detection, and then the herringbone detection frame 19 can be controlled to rotate, which can improve the detection accuracy.

[0025] Reference Figure 7 Both of the two centering clamping blocks 28 have a pre-reserved arc-shaped surface on their opposite sides, and the size of the arc-shaped surface is adapted to the diameter of the barrel-shaped injection molded part 12, so that it can be firmly fixed when clamped.

[0026] Reference Figure 1 and Figure 8 Near the bottom of the outer wall of the transmission tube 18, a C-shaped sliding ring 35 is slidably connected, and a connecting rod is hinged in the groove of the C-shaped sliding ring 35. The other end of the connecting rod is hinged to the support rod of the herringbone detection frame 19. Symmetrical permanent magnets 34 are fixed to the front and rear sides of the C-shaped sliding ring 35, and electromagnets 32 are fixed to the front and rear sides of the anti-slip bearing assembly 8. An L-shaped hanging plate 33 is provided on the side of the anti-slip bearing assembly 8 away from the electromagnet 32, and a magnetic column 2 is fixed to the bottom of the L-shaped hanging plate 33. The bottom of the magnetic column 2 repels the top of the permanent magnet 34. A driven cone is fixed to the top of the transmission tube 18. The gears and the upper surface of the two cantilever frames 9 are fixed with a reduction motor 31 near the anti-slip bearing assembly 8. The output shaft of the reduction motor 31 is fixed with a driving gear that meshes with the driven bevel gear. Through the electromagnet 32 ​​and the second magnetic column, the herringbone detection frame 19 can be erected as a whole when the barrel-shaped injection molded part 12 is not centered, which can protect the detection line 1 21 and the detection line 2 22. Moreover, after the detection stops, under the action of the repulsive force, the two permanent magnets 34 stop exactly below the electromagnet 32, ensuring that the herringbone detection frame 19 can be retracted and extended normally.

[0027] Reference Figures 3-4A sliding contact 182 is slidably connected to the inner wall of the bottom end of the transmission tube 18, and a return spring is fixed to the top of the sliding contact 182. A C-shaped retaining ring is fixed to the top of the return spring. A metal sheet 23 and a plastic sheet are fixed to the notch of the C-shaped retaining ring on the inner circumference of the transmission tube 18. An elastic contact piece 24 is fixed to the top of the sliding contact 182 and pressed on the plastic sheet. The elastic contact piece 24 and the metal sheet 23 are connected in series in the bottom contact circuit. When the bottom center bulges through the elastic contact piece 24, the bottom contact circuit will be connected, and then the wall thickness at the bottom center of the surface will not meet the standard.

[0028] Reference Figure 1 and Figure 2 The feeding conveyor frame 14 includes a front side plate and a rear side plate, and symmetrical centering guard plates 13 are fixed between the front side plate and the rear side plate respectively. The two centering guard plates 13 form a trumpet shape, which can center the incoming material.

[0029] Reference Figure 6 A base 1001 is fixed to the rear side of the liquid storage tank 1, and the bottom end of the L-shaped main support frame 10 is fixed above the base 1001.

[0030] Working Principle: When using this device, first ensure that the telescopic rod of the electric push rod 11 returns to its initial position. At this time, the moving pressure frame 5 is raised to the highest point above the liquid storage tank 1. At this point, the position of the two round rods 502 is higher than the height of the barrel opening of the barrel-shaped injection molded part 12 moving on the production line. Due to the presence of the four counterweights 26, the conveyor belt 4 above the liquid storage tank 1 is also in a horizontally taut state until the barrel-shaped injection molded part 12 to be tested moves to the center. Then, control the extension rod of the electric push rod 11 to extend. The two round rods 502 first contact the surface of the conveyor belt 4. Then, the arc-shaped parts of the two arched pressure rods 501 of the moving pressure frame 5 contact the opening of the barrel-shaped injection molded part 12 and generate downward pressure. Then, control the clamping machine. The mechanism is activated to clamp the barrel-shaped injection molded part 12 in the center. Then, the electromagnet 32 ​​is energized in reverse to generate a repulsive force at the top of the permanent magnet 34 below it, which drives the C-shaped sliding ring 35 to slide down, so as to unfold the herringbone detection frame 19 into the detection state. Then, the moving pressure frame 5 is continuously controlled to press down as a whole until the high-density detection liquid is close to the barrel opening. At this time, the barrel-shaped injection molded part 12 to be tested is subjected to uniform extrusion force from the outside to the inside. If the thickness of a certain position of the barrel is not up to standard, that position will be squeezed inward and bulge. At that time, as the herringbone detection frame 19 rotates along the wall, when it reaches the bulging position, the detection line 21 will be squeezed by the bulging position to contact the detection line 22, and then the alarm circuit will be activated, indicating that the thickness at that position is not up to standard.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic inspection and conveying line for injection molded products, comprising a liquid storage tank (1), wherein a feeding conveyor frame one (14) and a discharging conveyor frame two (3) are respectively arranged on the left and right sides of the liquid storage tank (1), and a common conveyor belt (4) is arranged between the feeding conveyor frame one (14) and the discharging conveyor frame two (3), characterized in that, The storage tank (1) contains a high-density detection liquid. An L-shaped main support frame (10) extending vertically upwards from the rear of the storage tank (1) is fixed. An electric push rod (11) extending vertically downwards is fixed to the top of the L-shaped main support frame (10). A movable pressure frame (5) is fixed to the bottom of the extension rod of the electric push rod (11). The movable pressure frame (5) includes an arched main beam fixed to the bottom of the extension rod of the electric push rod (11). A folded frame (6) is fixed to the top of the arched main beam. Two cantilever frames (9) extending towards the middle of the top of the folded frame (6) are fixed to the top of the folded frame (6). A thin-walled detection mechanism is fixed between the ends of the two cantilever frames (9). The thin-walled detection mechanism includes a protective layer. The anti-slip bearing assembly (8) is rotatably connected to a vertical transmission tube (18) in the middle, and a C-shaped fixing ring (181) is fixed near the bottom of the outer circumference of the transmission tube (18). A herringbone detection frame (19) is set in the notch of the C-shaped fixing ring (181). The same detection line (21) attached to the inner wall of the barrel-shaped injection molded part (12) is fixed between the three ends of the herringbone detection frame (19). A detection line (22) parallel to the detection line (21) is also set at the three ends of the herringbone detection frame (19). The detection line (21) is located between the inner wall to be detected and the detection line (22). The detection line (21) and the detection line (22) are connected in series in the alarm circuit.

2. The automatic inspection and conveying line for injection molded products according to claim 1, characterized in that, The feeding conveyor frame 1 (14) and the discharging conveyor frame 2 (3) are respectively provided with symmetrical tensioning mechanisms at the end near the liquid storage tank (1). One of the tensioning mechanisms includes two parallel rollers, a first roller (15) and a second roller (16), which are parallel to each other and of the same height at the end of the feeding conveyor frame 1 (14) near the liquid storage tank (1). The gap between the first roller (15) and the second roller (16) is equal to 3 times the thickness of the conveyor belt (4), and the axis of the first roller (15) is perpendicular to the conveying direction of the conveyor belt (4). The bottom end of the liquid storage tank (1) is fitted with a deep box (2) with an upward-opening rectangular box structure near the left and right ends. The bottom of the deep box (2) is fixed with vertical guide slide rods (17) at both the front and rear ends. Symmetrical bearing seats (25) are slidably sleeved on the two sets of guide slide rods (17), and the same tensioning roller (20) is provided between the two bearing seats (25).

3. The automatic inspection and conveying line for injection molded products according to claim 22, characterized in that, The lower surfaces of the four bearing seats (25) are all fixed with counterweights (26). The movable pressure frame (5) also includes round rods (502) fixed at the two ends of the arched main beam, which are horizontally equal in height and parallel to each other. The distance between the two steering rollers (16) is greater than the distance between the two round rods (502). The round rods (502) are parallel to the steering rollers (15). The distance between the two round rods (502) is greater than the diameter of the barrel opening of the barrel-shaped injection molded part (12). The two ends of the two round rods (502) are respectively fixed with symmetrical arched pressure rods (501). The top of the two arched pressure rods (501) is reserved with an arc-shaped part that bends towards the middle. The distance between the two arc-shaped parts is less than the diameter of the barrel opening of the barrel-shaped injection molded part (12).

4. The automatic inspection and conveying line for injection molded products according to claim 3, characterized in that, The round rod (502) is made of wear-resistant material, and the outer wall of the round rod (502) is polished.

5. The automatic inspection and conveying line for injection molded products according to claim 1, characterized in that, A clamping mechanism is also provided between the two arched pressure rods (501), and the clamping mechanism includes T-shaped pieces fixed above the two arc-shaped parts and symmetrically arranged. A drive toothed pulley and a driven toothed pulley (27) are respectively provided above the two T-shaped pieces at their far ends. The same toothed conveyor belt (30) is wound between the drive toothed pulley and the driven toothed pulley (27). A servo motor (7) is also fixed at the top of the folding frame (6), and the top of the output shaft of the servo motor (7) is fixed to the axle end of the drive toothed pulley through a coupling. The two T-shaped pieces are respectively slidably connected to symmetrical centering clamping blocks (28) at their far ends. Two parallel anti-torsion inserts (29) are reserved on the opposite side of the two centering clamping blocks (28). The anti-torsion inserts (29) are slidably inserted into the corresponding T-shaped pieces, and the two centering clamping blocks (28) are respectively fixed on the two sides of the toothed conveyor belt (30) moving towards each other.

6. The automatic inspection and conveying line for injection molded products according to claim 5, characterized in that, Both of the two centering clamping blocks (28) have a curved surface reserved on their opposite sides, and the size of the curved surface is adapted to the diameter of the barrel-shaped injection molded part (12).

7. The automatic inspection and conveying line for injection molded products according to claim 1, characterized in that, The outer wall of the transmission tube (18) is slidably connected to a C-shaped sliding ring (35) near the bottom end, and a connecting rod is hinged in the groove of the C-shaped sliding ring (35). The other end of the connecting rod is hinged to the support rod of the herringbone detection frame (19). The front and rear sides of the C-shaped sliding ring (35) are respectively fixed with mutually symmetrical permanent magnets (34), and the front and rear sides of the anti-slip bearing assembly (8) are fixed with electromagnets (32). The side of the anti-slip bearing assembly (8) away from the electromagnets (32) is provided with an L-shaped hanging plate (33), and the bottom end of the L-shaped hanging plate (33) is fixed with a magnetic column. The bottom end of the magnetic column repulses the top end of the permanent magnet (34). The top end of the transmission tube (18) is fixed with a driven bevel gear, and the upper surface of the two cantilever frames (9) is fixed with a reduction motor (31) near the anti-slip bearing assembly (8). The top end of the output shaft of the reduction motor (31) is fixed with a driving gear that meshes with the driven bevel gear.

8. An automatic inspection and conveying line for injection molded products according to claim 7, characterized in that, The bottom inner wall of the transmission tube (18) is slidably connected to a sliding contact (182), and a return spring is fixed at the top of the sliding contact (182). A C-shaped retaining ring is fixed at the top of the return spring. A metal sheet (23) and a plastic sheet are fixed at the notch of the C-shaped retaining ring on the circumferential inner wall of the transmission tube (18). An elastic contact sheet (24) is fixed at the top of the sliding contact (182) and pressed on the plastic sheet. The elastic contact sheet (24) and the metal sheet (23) are connected in series in the bottom contact circuit.

9. An automatic inspection and conveying line for injection molded products according to claim 1, characterized in that, The feeding conveyor frame (14) includes a front side plate and a rear side plate, and a symmetrical center guard plate (13) is fixed between the front side plate and the rear side plate respectively. The two center guard plates (13) form a trumpet shape.

10. An automatic inspection and conveying line for injection molded products according to claim 1, characterized in that, The liquid storage tank (1) is fixed to a base (1001) on the rear side, and the bottom end of the L-shaped main support frame (10) is fixed above the base (1001).

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