Automatic detection device for plastic bottle caps

Abstract

The present invention relates to the field of quality inspection of plastic products, and specifically to an automatic inspection device for plastic bottle caps, comprising an inspection platform and an extrusion mechanism. A torque turntable is rotatably provided on the inspection platform, a driving shaft capable of rotating and moving up and down is provided on the upper portion of the inspection platform through a driving mechanism, a mounting disc is fixedly installed on the lower portion of the driving shaft, and a detection mechanism for performing torque detection on the bottle cap is provided on the mounting disc and the torque turntable. The present invention adopts a connecting assembly to enable the extrusion wheel to squeeze the bottle body, and forms a high-pressure state inside the bottle body by reducing the internal space of the bottle body, thereby realizing torque testing under both high-pressure and normal-pressure scenarios inside the bottle. The present invention adopts a plurality of cap-clamping rollers to clamp the bottle cap, flexibly adjusts the abutting force of the cap-clamping rollers on the bottle cap through the driving assembly, and changes the number of free-rotating cap-clamping rollers through the locking roller assembly, thereby adjusting the number of clamping points on the bottle cap, thereby simulating the complex situation when a person twists the bottle cap by hand.

Description

Technical Field

[0001] The invention relates to the field of plastic product quality inspection, in particular to an automatic inspection device for plastic bottle caps. Background Art

[0002] The opening and closing performance of plastic bottle caps is an important indicator of bottle cap quality. Currently, the opening and closing performance of bottle caps is usually tested by detecting the torque required to open and close the bottle caps. Torque testing is a key link in balancing sealing, user experience and production efficiency, and directly affects product safety, compliance and market reputation.

[0003] At present, the automatic bottle cap torque tester is mainly used to detect the torque required for opening and closing the bottle cap. During the test, the bottle body is fixed on the lower part of the automatic bottle cap torque tester, and the bottle cap is fixed on the upper part of the automatic bottle cap torque tester. The automatic bottle cap torque tester rotates the bottle cap back and forth, driving the bottle cap to repeatedly open and close on the bottle body. At the same time, the torque is detected and recorded by the automatic bottle cap torque tester, and then the recorded torque value is compared with the standard value to determine whether the bottle cap torque test is qualified.

[0004] However, changes in the pressure inside the bottle will affect the torque test results of the bottle cap. The existing automatic bottle cap torque tester cannot adjust the pressure inside the bottle body when performing torque testing on the bottle cap, so that the test environment cannot cover both high pressure and normal pressure scenarios inside the bottle, resulting in a one-sided test result and the accuracy needs to be improved. In addition, the existing automatic bottle cap torque tester cannot flexibly adjust the clamping force and the number of clamping points on the bottle cap, and cannot simulate the complex situation when human hands twist the bottle cap, which makes the detection process deviate from the actual application scenario, and also affects the accuracy of the test results. Summary of the Invention

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an automatic detection device for plastic bottle caps, including a detection platform, a torque turntable is rotatably provided on the detection platform, a driving shaft that can rotate and move up and down is provided on the upper part of the detection platform through a driving mechanism, and a mounting disc is fixedly installed on the lower part of the driving shaft. The mounting disc and the torque turntable are jointly provided with a detection mechanism for torque detection of the bottle caps, and the detection device also includes a squeezing mechanism for squeezing the bottle body.

[0006] The detection mechanism includes sliding members arranged on the mounting disc at equal intervals along the circumference thereof, the sliding members being slidably connected to the mounting disc along the radial direction thereof, the lower portion of the sliding member being a rod-shaped structure, a clamping cover roller being rotatably arranged on the outer side of the rod-shaped structure of the sliding member, a locking roller assembly being provided on the sliding member for locking the rotation angle of the clamping cover roller, and the detection mechanism also including a driving assembly for driving the sliding member to move synchronously.

[0007] The detection mechanism also includes four bottle clamping rollers arranged on the torque turntable at equal intervals through a moving component. One side of the bottle clamping roller is a planar structure, and an adjustment component is provided on the bottle clamping roller to adapt to clamping square bottles.

[0008] The extrusion mechanism includes a sliding ring that is set in the middle between the mounting disc and the torque turntable through a centering component and slides up and down. Four wheel carrier blocks are arranged on the sliding ring at equal intervals along the circumference of the sliding ring through a connecting component. An extrusion wheel is rotatably arranged on one end of the wheel carrier block close to the axis of the sliding ring, and two adjacent wheel carrier blocks are hinged by a connecting plate.

[0009] Preferably, the locking roller assembly includes a No. 1 stud threadedly connected to the lower part of the sliding member, and a connecting locking member connected to the sliding member for sliding up and down is rotatably provided on the outer side of the No. 1 stud, and a locking plug for inserting into the corresponding clamping cover roller is fixedly installed on the connecting locking member.

[0010] Preferably, the driving assembly includes a raised rod fixedly mounted on the upper part of the sliding member, a linkage disc plate is rotatably arranged on the upper part of the mounting disc, and vortex grooves corresponding to the raised rods are opened on the linkage disc plate at equal intervals along its circumference. The raised rod slides inside the vortex grooves at the corresponding positions, and an electric push rod No. 1 is hingedly connected between the linkage disc plate and the driving shaft.

[0011] Preferably, the moving assembly includes moving blocks arranged at equal intervals along the circumference of the torque turntable, a swing block is rotatably arranged inside the moving block, an adjusting rod is connected inside the swing block, the upper part of the adjusting rod is slidably connected to the bottle clamping roller at the corresponding position up and down, and the torque turntable is rotatably provided with No. 3 studs threadedly connected to the moving blocks at the corresponding positions along its circumference, and two adjacent No. 3 studs are connected to each other for transmission by means of bevel gear connection.

[0012] Preferably, the lower part of the swing block is a semicircular arc structure, and an incomplete gear in the shape of a semicircular ring is fixedly installed on the lower part of the swing block. A rack meshing with the incomplete gear is slidably connected inside the moving block, and a driven plate is fixedly installed on the side of the rack close to the axis of the torque turntable, and the upper side of the driven plate is located between the upper side of the torque turntable and the lower side of the bottle clamping roller.

[0013] Preferably, four limiting support plates are fixedly installed on the outer side of the middle part of the adjustment rod at equal intervals along its circumference, and a cross slot for inserting the limiting support plates is opened on the swing block.

[0014] Preferably, the adjustment assembly includes two symmetrically arranged extended abutment plates slidably arranged on the bottle clamping roller plane structure, a triangular plate is slidably arranged in the middle of the bottle clamping roller plane structure, and the two inclined surfaces of the triangular plate are slidably connected to the two extended abutment plates at corresponding positions respectively.

[0015] Preferably, a No. 2 stud is rotatably connected inside the bottle clamping roller, the No. 2 stud is threadedly connected to the adjusting rod at the corresponding position, and the triangular plate is fixedly connected to the adjusting rod at the corresponding position.

[0016] Preferably, the centering component includes a linkage ring rotatably arranged on the outside of the mounting disc, and two guide columns connected to the linkage ring for sliding up and down are fixedly installed on the outside of the torque turntable through a support plate, and the sliding rings are connected to the middle of the guide columns for sliding up and down together, and a synchronous connecting plate is rotatably arranged in the middle of the right side of the sliding ring, and the two ends of the synchronous connecting plate are respectively hinged to the support plate and the linkage ring of the torque turntable through hinge plates.

[0017] Preferably, the connecting assembly includes a rotating ring plate rotatably arranged on a sliding ring, the wheel frame block is slidingly connected to the rotating ring plate along the radial direction of the rotating ring plate, an execution motor is fixedly installed at the rear of the sliding ring to drive the rotating ring plate to rotate by gear transmission, and a No. 2 electric push rod is arranged between the rotating ring plate and one of the wheel frame blocks.

[0018] The beneficial effects of the present invention are as follows: 1. The present invention adopts a connecting component to enable the extrusion wheel to squeeze the bottle body, thereby forming a high-pressure state inside the bottle body by reducing the internal space of the bottle body, thereby realizing torque testing under both high-pressure and normal-pressure scenarios inside the bottle, thereby improving the comprehensiveness of the test results.

[0019] Second, the present invention adopts a connecting plate to hinge two adjacent wheel frame blocks, so that the two adjacent wheel frame blocks move alternately and the two opposite wheel frame blocks move symmetrically, so that the wheel frame blocks can drive the extrusion wheels to extrude the square bottle body in two directions, and the connecting assembly can also rotate the wheel frame blocks to enable the extrusion wheels to perform circumferential surrounding extrusion on the cylindrical bottle body. Then, through multi-directional extrusion testing, it can more realistically simulate the complex mechanical environment of the bottle cap during transportation, storage and use, and further improve the comprehensiveness of the test results.

[0020] 3. The present invention adopts multiple cap-gripping rollers to clamp the bottle caps, flexibly adjusts the abutting force of the cap-gripping rollers on the bottle caps through the driving assembly, and changes the number of free rotations of the cap-gripping rollers through the locking roller assembly, thereby adjusting the number of clamping points on the bottle caps, thereby simulating the complex situation of human hands when twisting the bottle caps, making the detection process more suitable for actual application scenarios, and further improving the comprehensiveness of the detection results.

[0021] Fourth, the present invention adopts a moving component to drive the bottle clamping roller to stably clamp the bottle body, and the bottle clamping roller is tilted in advance, so that when the bottle body is squeezed and deformed, the tilted bottle clamping roller compensates for the deformation of the bottom of the bottle body, making the bottle clamping roller clamping the bottle body more stable. In addition, the centering component can enable the squeezing wheel to automatically squeeze the middle part of the bottle body, further increasing the stability of clamping the bottle body and ensuring the accuracy of torque detection.

[0022] 5. The present invention adopts an adjustment component to increase the abutment area of ​​the square bottle when the bottle clamping roller clamps the square bottle, further preventing the square bottle from rotating relative to the torque turntable, thereby increasing the clamping stability of the bottle clamping roller on the square bottle and improving the overall applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and examples.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a structural schematic diagram of the torque turntable, moving assembly, bottle clamping roller and adjustment assembly in the present invention.

[0026] Figure 3 It is a partial cross-sectional view of the moving assembly, the bottle clamping roller and the adjusting assembly in the present invention.

[0027] Figure 4 It is a separated cross-sectional view of the swing block, the adjustment rod, the bottle clamping roller and the adjustment component in the present invention.

[0028] Figure 5 It is a partial cross-sectional view of the driving shaft, mounting disc, sliding member, clamping cover roller, driving assembly and locking roller assembly in the present invention.

[0029] Figure 6 It is a structural schematic diagram of the driving shaft, mounting disc and driving assembly in the present invention.

[0030] Figure 7 It is a structural schematic diagram of the torque turntable and the extrusion mechanism in the present invention.

[0031] Figure 8 This is a state change diagram of the present invention where the extrusion wheel extrudes the bottle body from left to right to extrudes the bottle body from front to back.

[0032] In the figure: 1. Testing table; 2. Torque turntable; 3. Driving mechanism; 4. Driving shaft; 5. Mounting disc; 6. Testing mechanism; 7. Extrusion mechanism; 61. Sliding member; 62. Cap clamping roller; 63. Locking roller assembly; 64. Driving assembly; 65. Moving assembly; 66. Bottle clamping roller; 67. Adjusting assembly; 71. Centering assembly; 72. Sliding ring; 73. Connecting assembly; 74. Wheel frame block; 75. Extrusion wheel; 76. Connecting plate; 631. No. 1 stud; 632. Connecting locking member; 633. Locking plug; 641. Raised rod; 642. Linkage Disc plate; 643, vortex groove; 644, No. 1 electric push rod; 651, moving block; 652, swing block; 653, adjusting rod; 654, No. 3 stud; 671, extension support plate; 672, triangle plate; 673, No. 2 stud; 711, linkage ring; 712, guide column; 713, synchronous connecting plate; 714, hinged plate; 731, rotating ring plate; 732, executive motor; 733, No. 2 electric push rod; 6521, incomplete gear; 6522, rack; 6523, driven plate; 6531, limit support plate; 6532, cross slot. DETAILED DESCRIPTION

[0033] The following embodiments of the present invention are described in detail. The embodiments described below are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in the art or in the product specifications shall be followed.

[0034] See Figure 1 and Figure 5 A plastic bottle cap automatic detection device includes a detection platform 1 and a squeezing mechanism 7 for squeezing the bottle body. A torque turntable 2 is rotatably provided on the detection platform 1. A driving shaft 4 that can rotate and move up and down is provided on the upper part of the detection platform 1 through a driving mechanism 3. A mounting disc 5 is fixedly installed on the lower part of the driving shaft 4. A detection mechanism 6 for torque detection of the bottle cap is jointly provided on the mounting disc 5 and the torque turntable 2. The detection device also includes a squeezing mechanism 7 for squeezing the bottle body.

[0035] When it is necessary to inspect the plastic bottle cap, the bottle body is first placed on the inspection table 1, and the bottle body and the bottle cap are clamped and fixed by the inspection mechanism 6, so that the bottle body and the torque turntable 2 are locked into a whole, and the bottle cap and the mounting disc 5 are locked into a whole.

[0036] Then, according to the detection requirements, the bottle body is squeezed by the squeezing mechanism 7, so that the pressure inside the bottle body increases and the bottle body is deformed. Then, the driving shaft 4 is rotated by the driving mechanism 3, so that the driving shaft 4 twists the bottle cap through the detection mechanism 6. At the same time, the torque applied to the bottle body is detected by the torque turntable 2. Then, according to the detection requirements, the number of clamping points and the clamping force of the bottle cap are changed by the detection mechanism 6, and then the bottle cap is twisted and tested again.

[0037] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The detection mechanism 6 includes a moving assembly 65, which includes four moving blocks 651 arranged at equal intervals along the circumference of the torque turntable 2. A swing block 652 is provided inside the moving block 651 through a torsion spring rod. An adjusting rod 653 is connected to the inside of the swing block 652. The upper part of the adjusting rod 653 is connected to a bottle clamping roller 66 that slides up and down. One side of the bottle clamping roller 66 is a flat structure. Four limiting support plates 6531 are fixedly installed on the outer side of the middle part of the adjusting rod 653 at equal intervals along its circumference. A cross slot 6532 is provided on the swing block 652 for inserting the limiting support plate 6531.

[0038] When it is necessary to clamp and fix the bottle body on the torque turntable 2, the operator places the bottle body on the upper middle side of the torque turntable 2, and then adjusts the orientation of the plane structure of the bottle clamping roller 66 according to the shape of the bottle; when the bottle is cylindrical, the cylindrical surface of the bottle clamping roller 66 is directed toward the axis of the torque turntable 2, so that the cylindrical bottle body is clamped by the cylindrical surface of the bottle clamping roller 66.

[0039] When the bottle is of a square structure, the operator manually pulls the adjustment rod 653 upwards so that the limit support plate 6531 on the adjustment rod 653 moves completely above the swing block 652, and then the operator manually rotates the adjustment rod 653 half a circle so that the adjustment rod 653 drives the bottle clamping roller 66 to rotate synchronously, so that one side of the planar structure of the bottle clamping roller 66 faces the axis position of the torque turntable 2, and then the planar structure of the bottle clamping roller 66 is pressed against the planar side of the square bottle.

[0040] The operator then moves the adjustment rod 653 downward, so that the adjustment rod 653 drives the limit support plate 6531 on it to be inserted into the cross groove 6532 of the swing block 652 again, thereby connecting the adjustment rod 653 and the swing block 652 into a whole, preventing the adjustment rod 653 from rotating without external force.

[0041] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4The bottle clamping roller 66 is provided with an adjustment component 67 that is adapted to clamping square bottles. The adjustment component 67 includes two symmetrically arranged extended abutment plates 671 that are slidably set on the plane structure of the bottle clamping roller 66. A triangular plate 672 is slidably set up in the middle of the plane structure of the bottle clamping roller 66. The two inclined surfaces of the triangular plate 672 are respectively slidably connected to the two extended abutment plates 671 at the corresponding positions. A No. 2 stud 673 is rotatably connected inside the bottle clamping roller 66. The No. 2 stud 673 is threadedly connected to the adjustment rod 653 at the corresponding position, and the triangular plate 672 is fixedly connected to the adjustment rod 653 at the corresponding position.

[0042] When it is necessary to clamp the other bottle, the operator manually rotates the second stud 673, causing the second stud 673 to drive the bottle clamping roller 66 to move upward relative to the adjustment rod 653. The bottle clamping roller 66 then drives the two extended abutment plates 671 thereon to move upward synchronously relative to the triangular plate 672, thereby causing the triangular plate 672 to push the two extended abutment plates 671 away from each other, thereby causing the two extended abutment plates 671 to expand the clamping range of the bottle clamping roller 66 on the other bottle, thereby increasing the clamping stability of the other bottle. It should be noted that the center of gravity of the entire structure of the bottle clamping roller 66 and the adjustment assembly 67 is distributed on the axis of the adjustment rod 653, and the swing block 652 is symmetrically distributed about the axis of the adjustment rod 653. This arrangement is intended to ensure that the bottle clamping roller 66 and the adjustment assembly 67 as a whole remain in a substantially vertical state before squeezing the bottle body.

[0043] See Figure 2 、 Figure 3 and Figure 4 The torque turntable 2 is provided with three studs 654 that are threadedly connected to the moving block 651 at the corresponding position and are rotated at equal intervals along its circumference. Two adjacent three studs 654 are connected to each other through a bevel gear connection. The lower part of the swing block 652 is a semicircular arc structure. The lower part of the swing block 652 is fixedly installed with an incomplete gear 6521 in the shape of a semicircular ring. The interior of the moving block 651 is slidably connected with a rack 6522 that meshes with the incomplete gear 6521. A driven plate 6523 is fixedly installed on the side of the rack 6522 close to the axis of the torque turntable 2. The upper side of the driven plate 6523 is located between the upper side of the torque turntable 2 and the lower side of the bottle clamping roller 66.

[0044] After the direction adjustment of the bottle clamping roller 66 is completed, the operator manually rotates one of the No. 3 studs 654, and the No. 3 stud 654 drives the adjacent No. 3 studs 654 to rotate synchronously through the bevel gear connection, so that all the No. 3 studs 654 rotate synchronously, and then the No. 3 stud 654 drives the four moving blocks 651 to move synchronously toward the axis of the torque turntable 2. The moving block 651 drives the driven plate 6523 to move synchronously through the rack 6522. At the same time, the moving block 651 drives the bottle clamping roller 66 to move synchronously through the swing block 652.

[0045] Then the driven plate 6523 comes into contact with the bottle body before the bottle clamping roller 66, and then the No. 3 stud 654 continues to rotate, so that the reaction force of the bottle body on the driven plate 6523 pushes the driven plate 6523 in the direction away from the axis of the torque turntable 2. The driven plate 6523 drives the incomplete gear 6521 to rotate through the rack 6522. The incomplete gear 6521 drives the upper part of the bottle clamping roller 66 to tilt in the direction close to the axis of the torque turntable 2 through the swing block 652, so that the bottle clamping roller 66 comes into contact with the bottle body in a pre-tilted posture, so that it can adapt to the deformed bottle body and ensure the stability of clamping.

[0046] It should be noted that if Figure 2 、 Figure 3 As shown, a stop rod for blocking the swing block 652 is provided on one side of the moving block 651 close to the axis of the torque turntable 2. The stop rod can prevent the swing block 652 from driving the bottle clamping roller 66 to swing to a horizontal state in the initial state, thereby ensuring that the bottle clamping roller 66 can rest against the bottle body.

[0047] See Figure 1 、 Figure 5 and Figure 6 The detection mechanism 6 also includes sliding members 61 arranged on the mounting disc 5 at equal intervals along the circumference thereof. The sliding members 61 are slidably connected to the mounting disc 5 along the radial direction thereof. The lower part of the sliding member 61 is a rod-shaped structure, and a clamping cover roller 62 is rotatably arranged on the outer side of the rod-shaped structure of the sliding member 61.

[0048] See Figure 1 、 Figure 5 and Figure 6 The sliding member 61 is provided with a locking roller assembly 63 for locking the rotation angle of the clamping cover roller 62. The locking roller assembly 63 includes a No. 1 stud 631 threadedly connected to the lower part of the sliding member 61. The outer side of the No. 1 stud 631 is rotatably provided with a connecting locking member 632 connected to the sliding member 61 for sliding up and down. A locking plug 633 for inserting into the corresponding clamping cover roller 62 is fixedly installed on the connecting locking member 632.

[0049] When it is necessary to lock the bottle cap and the mounting disc 5 into a whole, the operator manually rotates the No. 1 stud 631 in advance according to the requirements of the inspection, and rotates the corresponding number and position of the No. 1 stud 631 according to the number and position of the bottle cap clamping points required during the inspection. The No. 1 stud 631 drives the connecting locking member 632 on it to move upward relative to the cap clamping roller 62, so that the locking pin 633 on the connecting locking member 632 is inserted into the interior of the cap clamping roller 62 at the corresponding position, and then the connecting locking member 632 is simultaneously connected to the cap clamping roller 62 and the sliding member 61 in an upward and downward sliding manner, so as to lock the rotation angle of the cap clamping roller 62. In the case where the cap clamping roller 62 is detachably mounted relative to the sliding member 61, when the number of bottle cap clamping points needs to be increased, the number of cap clamping rollers 62 is increased.

[0050] When the rotation angle of the cap clamping roller 62 is locked, the mounting disc 5 can apply static friction to the bottle cap through the cap clamping roller 62 with locked rotation angle, while the freely rotating cap clamping roller 62 applies rolling friction to the bottle cap. Thus, by changing the number of cap clamping rollers 62 with locked rotation angle (i.e., rotation angle), the number of static friction clamping points on the bottle cap can be changed, and by selecting the position of the cap clamping roller 62 with locked rotation angle, the position of the clamping point on the bottle cap can be changed.

[0051] See Figure 1 、 Figure 5 and Figure 6 The detection mechanism 6 also includes a driving assembly 64 that drives the sliding member 61 to move synchronously. The driving assembly 64 includes a raised rod 641 fixedly mounted on the upper part of the sliding member 61, and a linkage disk plate 642 is rotatably provided on the upper part of the mounting disk 5. The linkage disk plate 642 is provided with vortex grooves 643 corresponding to the raised rods 641 at equal intervals along its circumference. The raised rod 641 slides inside the vortex grooves 643 at the corresponding position. An electric push rod 644 is hingedly connected between the linkage disk plate 642 and the driving shaft 4.

[0052] After the rotation angle of the cap clamping roller 62 is locked, the driving shaft 4 is moved downward by the driving mechanism 3, and the driving shaft 4 drives the mounting disc 5 to move downward to the position of the bottle cap, so that the mounting disc 5 drives the cap clamping roller 62 to move downward to the vicinity of the bottle cap, and at this time the mounting disc 5 does not contact the bottle cap, and then the protruding section of the No. 1 electric push rod 644 is extended according to the requirement of detecting the clamping force, so that the No. 1 electric push rod 644 drives the interlocking disc plate 642 to rotate relative to the driving shaft 4, and the interlocking disc plate 642 makes the raised rod 641 move along the radial direction of the mounting disc 5 through the vortex groove 643 thereon, so that the raised rod 641 drives the cap clamping roller 62 to move and clamp on the outer surface of the bottle cap through the sliding member 61.

[0053] See Figure 1 、 Figure 5 、 Figure 7 and Figure 8 The extrusion mechanism 7 includes a centering component 71, which includes a linkage ring 711 rotatably arranged on the outside of the mounting disc 5. Two guide columns 712 are fixedly installed on the outside of the torque turntable 2 through a support plate and are connected to the linkage ring 711 for vertical sliding. The middle parts of the two guide columns 712 are connected to the sliding ring 72 for vertical sliding. A synchronous connecting plate 713 is rotatably arranged in the middle part of the right side of the sliding ring 72. The two ends of the synchronous connecting plate 713 are respectively hinged to the support plate and the linkage ring 711 of the torque turntable 2 through hinge plates 714.

[0054] When the mounting disc 5 moves downward to the position of the bottle cap, the mounting disc 5 drives the linkage ring 711 to move downward synchronously, and the linkage ring 711 drives the synchronization connecting plate 713 to rotate through the upper hinge plate 714, and the synchronization connecting plate 713 simultaneously drives the torque turntable 2 through the lower hinge plate 714. Since the torque turntable 2 cannot move, the synchronization connecting plate 713 drives the sliding ring 72 to slide downward to the middle position between the mounting disc 5 and the torque turntable 2, so that the sliding ring 72 is located in the middle position of the bottle body, thereby facilitating the squeezing of the easily deformed area in the middle of the bottle body, and avoiding the squeezing point being located at the position of the bottle body close to the bottle cap, which affects the stability of the clamping and locking of the bottle body and the bottle cap. It should be noted that Figure 1 Although only one side of the hinge plate 714 and the synchronous connecting plate 713 is shown, the synchronous connecting plate 713 can also be symmetrically arranged on the left and right to improve the structural stability as required.

[0055] See Figure 7 and Figure 8 A connecting assembly 73 is provided on the sliding ring 72, and the connecting assembly 73 includes a rotating ring plate 731 rotatably provided on the sliding ring 72. Four wheel carrier blocks 74 that slide radially along the rotating ring plate 731 are provided on the rotating ring plate 731 at equal intervals along its circumference. An extrusion wheel 75 is rotatably provided on one end of the wheel carrier block 74 close to the axis of the sliding ring 72, and two adjacent wheel carrier blocks 74 are hinged by a connecting plate 76.

[0056] See Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 、 Figure 7 and Figure 8 An executive motor 732 is fixedly installed at the rear of the sliding ring 72 , and the executive motor 732 drives the rotating ring plate 731 to rotate through gear transmission. A second electric push rod 733 is provided between the rotating ring plate 731 and one of the wheel frame blocks 74 .

[0057] When the cap clamping roller 62 is clamped on the outer side of the bottle cap, the telescopic section of the No. 2 electric push rod 733 is extended to drive the wheel frame block 74 at the corresponding position to move toward the axial direction of the rotating ring plate 731, and the wheel frame block 74 connected to the No. 2 electric push rod 733 drives the extrusion wheel 75 thereon to squeeze the middle part of the bottle body. At the same time, the wheel frame block 74 connected to the No. 2 electric push rod 733 pushes the two adjacent wheel frame blocks 74 synchronously away from the axis of the rotating ring plate 731 through the connecting plate 76 thereon, and makes the wheel frame block 74 connected opposite to the No. 2 electric push rod 733 drive the extrusion wheel 75 thereon to also squeeze the middle part of the bottle body, thereby symmetrically squeezing the bottle body in two opposite directions.

[0058] The bottle body is squeezed and deformed, causing the pressure inside the bottle to increase. Subsequently, the driving mechanism 3 rotates the driving shaft 4, and the driving shaft 4 twists the bottle cap through the clamping roller 62. The torsional force exerted on the bottle cap is transmitted to the torque turntable 2 through the bottle body and the bottle clamping roller 66, so that the torque turntable 2 detects and records the torsional force exerted on the bottle cap.

[0059] When the torque detected by the torque turntable 2 suddenly decreases, if the bottle cap is opened smoothly, that is, there is no slippage between the clamping roller 62 and the bottle cap; if the bottle cap is not opened smoothly, that is, there is slippage between the clamping roller 62 and the bottle cap, then increase the clamping force or the number of clamping points, twist the bottle cap again until the bottle cap is opened smoothly, and the anti-slip performance of the bottle cap is detected by the clamping force and the number of clamping points acting on the bottle cap when the bottle cap is opened smoothly, and by recording the maximum torque applied to the bottle body when the bottle cap is opened smoothly, the torque applied to the bottle cap when opening when the bottle body is in a high-pressure state is detected.

[0060] It should be noted that the purpose of increasing the clamping force or the number of clamping points is to prevent relative slippage between the bottle body and the bottle clamping roller 66 so that the bottle body can rotate relative to the torque turntable 2 to ensure smooth opening of the bottle cap. The specific process is as follows:

[0061] Increase the clamping force: the operator manually rotates one of the No. 3 studs 654, and the No. 3 stud 654 drives the adjacent No. 3 studs 654 to rotate synchronously through the bevel gear connection, so that all the No. 3 studs 654 rotate synchronously, thereby causing the No. 3 stud 654 to drive the four moving blocks 651 to move synchronously toward the axis of the torque turntable 2, thereby causing the bottle clamping roller 66 to move further toward the bottle body, thereby increasing the clamping force of the bottle clamping roller 66 on the side of the bottle body near the bottom (the clamping position of the bottle clamping roller 66 is increased from Figure 1 As can be clearly seen in the figure), increasing the clamping force will increase the positive pressure between the bottle body and the bottle clamping roller 66. According to the friction formula F (friction) = μ × F (positive pressure), friction increases accordingly. Greater friction counteracts the torque generated when twisting the bottle cap, preventing the bottle from slipping. The friction formula is common knowledge. The above method for increasing clamping force applies to both square and cylindrical bottles, and the amount of clamping force can be adjusted during the inspection process until the appropriate level is achieved. Inspection is not a single process, but rather involves repeated operations, dynamic adjustments, real-time feedback, analysis, and optimization.

[0062] For cylindrical bottle bodies, the clamping force of the bottle clamping roller 66 can be increased to cause the portion of the bottle body within the clamping range of the bottle clamping roller 66 to undergo a slight and appropriate concave deformation. When the bottle body undergoes concave deformation, the contact surface between the bottle clamping roller 66 and the bottle body changes from a tangent clamping surface to a concave clamping arc surface, significantly increasing the clamping contact area. A larger contact area can distribute more clamping force, thereby increasing the overall friction force. A local high-pressure area is formed at the concave deformation site, further enhancing the friction force. It is common knowledge that an increase in clamping force can cause an object with deformation ability to deform or not deform. At the same time, Figure 1 It can be clearly seen that the height difference between the bottle clamping roller 66 and the bottle body is very large. The clamping range of the bottle clamping roller 66 is only at the side of the bottle body near the bottom. The slight appropriate concave deformation caused by the bottle clamping roller 66 is also concentrated only at the side of the bottle body near the bottom. Other parts of the bottle body side are not directly affected by the clamping force of the bottle clamping roller 66 and will not be deformed. Therefore, it will not affect the subsequent inspection operation under the squeezing of the squeezing wheel 75.

[0063] Increase the number of clamping points: When ensuring that there is no relative slippage between the bottle body and the bottle clamping roller 66, if the bottle cap is not opened smoothly, the number of the clamping rollers 62 is increased accordingly to increase the number of clamping points of the bottle cap, thereby increasing the clamping force of the bottle cap. The process of adding the clamping rollers 62 has been clearly stated in the previous article and will not be repeated here.

[0064] When the bottle body is square, the telescopic section of the second electric push rod 733 is retracted, so that the two squeezing wheels 75 that originally squeezed the bottle body are away from the bottle body, and at the same time, the two squeezing wheels 75 that were originally away from the bottle body are squeezed on the bottle body, so that the square bottle body is displaced and squeezed, that is, the force position and force direction of the square bottle body are changed, and the detection operation under the action of forces in different directions and positions is realized; when the bottle body is cylindrical, the execution motor 732 is started to drive the rotating ring plate 731 to rotate, and the rotating ring plate 731 drives the two squeezing wheels 75 that originally squeezed the bottle body to rotate, thereby displaced and squeezed, which is also to change the force position and force direction of the bottle body, and then the bottle cap is twisted again to detect the bottle cap opening torque when the bottle body is in different deformation positions.

[0065] It should be noted that if Figure 7 As shown, the difference between the number of teeth of the gear installed on the execution motor 732 and the number of teeth of the gear installed on the rotating ring plate 731 is relatively large. The purpose of this arrangement is to drive the rotating ring plate 731 to rotate by driving the large gear with the small gear. According to the conversion formula of the gear tooth ratio and the transmission ratio of the gear transmission system, the high-speed rotation of the small gear can be converted into the low-speed rotation of the rotating ring plate 731, and then the extrusion wheel 75 can be easily driven to roll on the bottle body with a large torque.

[0066] The telescopic section of the No. 2 electric push rod 733 is then restored to its initial state so that the bottle body is not squeezed. The operator then manually restores the bottle body to its original state so that the inside of the bottle body returns to normal pressure. The bottle cap is then twisted again to detect the opening torque of the bottle cap under normal pressure.

[0067] It should be noted that, in this embodiment, by directly rotating the mounting disc 5 without placing the bottle body and the bottle cap, the mounting disc 5 transmits torque to the torque turntable 2 through the friction force on the linkage ring 711, thereby detecting the no-load torque data that will be generated in the absence of the bottle body of the present invention, and then the detection reading of the torque of the torque turntable 2 by the detection platform 1 is reset to zero. When the bottle cap torque is subsequently detected, the final data obtained is subtracted from the no-load torque data to avoid additional errors.

[0068] When inspecting bottle caps, the present invention specifically performs the following steps: First, the operator places the bottle body on the upper middle side of the torque turntable 2, and then adjusts the orientation of the planar structure of the bottle clamping roller 66 according to the shape of the bottle. The operator manually rotates the No. 3 stud 654 to drive the bottle clamping roller 66 to rest against the bottle body in a pre-tilted posture.

[0069] In the second step, the operator manually rotates the No. 1 stud 631 in advance according to the detection requirements, so that the connecting locking piece 632 locks the rotation angle of the corresponding number and position of the clamping rollers 62, and moves the mounting disc 5 downward to the position of the bottle cap through the driving mechanism 3, and extends the extended section of the No. 1 electric push rod 644, so that the clamping rollers 62 are clamped on the outer surface of the bottle cap with the clamping force required for detection.

[0070] In the third step, the telescopic section of the second electric push rod 733 is extended to drive the two oppositely arranged squeezing wheels 75 to squeeze the middle part of the bottle body. Then the driving mechanism 3 rotates the driving shaft 4, so that the clamping roller 62 twists the bottle cap, and the torque applied to the bottle cap is detected and recorded by the torque turntable 2.

[0071] In the fourth step, when the torque detected by the torque turntable 2 suddenly decreases, observe whether the bottle cap is opened smoothly to detect the anti-slip performance of the bottle cap. When the bottle cap is opened smoothly, by recording the maximum torque applied to the bottle body when the bottle cap is opened smoothly, the torque applied to the bottle cap when it is opened under high pressure inside the bottle body is detected.

[0072] The fifth step is to retract the telescopic section of the second electric push rod 733 when the bottle body is square. When the bottle body is cylindrical, start the execution motor 732 to drive the extrusion wheel 75 to rotate around the bottle body, thereby changing the position of the extrusion, and then twist the bottle cap again to detect the bottle cap opening torque when the bottle body is in different deformation positions.

[0073] Step 6: Return the telescopic section of the second electric push rod 733 to its initial state so that the bottle body is not squeezed and the interior of the bottle body returns to normal pressure. Then twist the bottle cap again to detect the opening torque of the bottle cap under normal pressure of the bottle body.

[0074] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention, which are still covered by the scope of protection of the present invention.

Claims

1. An automatic testing device for plastic bottle caps, comprising a testing platform, a torque turntable rotatably provided on the testing platform, and a driving shaft capable of rotating and moving up and down provided on the upper portion of the testing platform through a driving mechanism, characterized in that: A mounting disc is fixedly mounted on the lower part of the driving shaft, and a detection mechanism for detecting torque on the bottle cap is provided on the mounting disc and the torque turntable; The detection mechanism includes a sliding member arranged on the mounting disc at equal intervals along the circumference thereof, a cap clamping roller rotatably arranged on the sliding member, and a locking roller assembly for locking the rotation angle of the cap clamping roller. The locking roller assembly changes the number of free-rotating cap clamping rollers to change the amount of static friction exerted by the cap clamping roller on the bottle cap, thereby changing the number of clamping points on the bottle cap; The detection mechanism also includes a driving assembly for driving the sliding member to move synchronously, and the detection mechanism also includes four bottle clamping rollers arranged on the torque turntable at equal intervals through the moving assembly; The extrusion mechanism is used to extrude the bottle body; the extrusion mechanism includes a sliding ring arranged in the middle between the mounting disc and the torque turntable through a centering component, and four wheel bracket blocks are arranged on the sliding ring at equal intervals along the circumference of the sliding ring through a connecting component. An extrusion wheel is rotatably arranged on one end of the wheel bracket block close to the axis of the sliding ring, and two adjacent wheel bracket blocks are hinged by a connecting plate. The bottle body is squeezed by the extrusion wheel to reduce the internal space of the bottle body, thereby increasing the internal pressure of the bottle body.

2. The automatic detection device for plastic bottle caps according to claim 1, characterized in that: The locking roller assembly includes a No. 1 stud threadedly connected to the lower part of the sliding member, and a connecting locking member that is rotatably provided on the outer side of the No. 1 stud and connected to the sliding member for sliding up and down is fixedly installed on the connecting locking member. A locking plug for inserting into the corresponding clamping cover roller is fixedly installed on the connecting locking member.

3. The automatic detection device for plastic bottle caps according to claim 1, characterized in that: The driving assembly includes a raised rod fixedly mounted on the upper part of the sliding member, the sliding member is slidably connected to the mounting disc along the radial direction, a linkage disc plate is rotatably arranged on the upper part of the mounting disc, and vortex grooves corresponding to the raised rods are opened at equal intervals along the circumference of the linkage disc plate, the raised rod slides inside the vortex grooves at the corresponding positions, and a No. 1 electric push rod is hinged between the linkage disc plate and the driving shaft.

4. The automatic detection device for plastic bottle caps according to claim 1, characterized in that: The moving assembly includes moving blocks arranged at equal intervals along the circumference of the torque turntable, a swing block is rotatably arranged inside the moving block, an adjusting rod is connected inside the swing block, the upper part of the adjusting rod is slidably connected to the bottle clamping roller at the corresponding position up and down, and three studs threadedly connected to the moving blocks at the corresponding position are rotatably arranged on the torque turntable at equal intervals along its circumference, and two adjacent No. 3 studs are connected to each other for transmission by means of bevel gear connection.

5. The automatic detection device for plastic bottle caps according to claim 4, characterized in that: The lower part of the swing block is a semicircular arc structure, and an incomplete gear in the shape of a semicircular ring is fixedly installed on the lower part of the swing block. A rack meshing with the incomplete gear is slidably connected inside the moving block, and a driven plate is fixedly installed on the side of the rack close to the axis of the torque turntable, and the upper side of the driven plate is located between the upper side of the torque turntable and the lower side of the bottle clamping roller.

6. The automatic detection device for plastic bottle caps according to claim 4, characterized in that: Four limiting support plates are fixedly installed on the outer side of the middle part of the adjusting rod at equal intervals along the circumference thereof, and a cross slot for inserting the limiting support plates is opened on the swing block.

7. The automatic detection device for plastic bottle caps according to claim 4, characterized in that: The bottle clamping roller is provided with an adjustment component adapted to clamping square bottles. One side of the bottle clamping roller is a planar structure. The adjustment component includes two symmetrically arranged extended abutment plates slidably arranged on the plane structure of the bottle clamping roller. A triangular plate is provided in the middle of the plane structure of the bottle clamping roller for sliding up and down. The two inclined surfaces of the triangular plate are respectively slidably connected to the two extended abutment plates at corresponding positions.

8. The automatic detection device for plastic bottle caps according to claim 7, characterized in that: A No. 2 stud is rotatably connected inside the bottle clamping roller. The No. 2 stud is threadedly connected to an adjusting rod at a corresponding position, and a triangular plate is fixedly connected to the adjusting rod at a corresponding position.

9. The automatic detection device for plastic bottle caps according to claim 1, characterized in that: The centering component includes a linkage ring rotatably arranged on the outside of the mounting disc, and two guide columns connected to the linkage ring for sliding up and down are fixedly installed on the outside of the torque turntable through a support plate. The sliding rings are connected to the middle of the guide columns for sliding up and down together, and a synchronous connecting plate is rotatably arranged in the middle of the right side of the sliding ring. The two ends of the synchronous connecting plate are respectively hinged to the support plate and the linkage ring of the torque turntable through hinge plates.

10. The automatic detection device for plastic bottle caps according to claim 1, characterized in that: The connecting assembly includes a rotating ring plate rotatably arranged on a sliding ring, a wheel frame block slidingly connected to the rotating ring plate along the radial direction of the rotating ring plate, an executive motor that drives the rotating ring plate to rotate through gear transmission is fixedly installed at the rear of the sliding ring, and a No. 2 electric push rod is arranged between the rotating ring plate and one of the wheel frame blocks.

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