A strength detection device for composite packaging bag production

Abstract

The present application relates to a kind of strength detection device for composite packaging bag production, it is related to composite plastic strength detection technical field, the present application includes detection machine, detection machine is provided with lifting rod, lifting rod bottom is provided with chuck, the number of chuck is two and symmetrically distributed, cutting mechanism is arranged between two chucks, cutting mechanism is used to be clamped while cutting packaging bag into standard sample, the operation of first clamping standard sample after cutting is realized by cutting mechanism, and production efficiency is improved, the cutting of sample is realized using the step of the distance shortening of clamping block one and clamping block two is synchronous, the merging of production step is realized, the lifting rod of detection machine itself is used simultaneously with the lifting function, driving movable blade linearly rises and realizes the cutting of sample side, after cutting, the cutting knife and the limiting space generated after the embedding of receiving groove in the chuck in clamping state are set, limit the deviation space of film sample in the process of stretching.

Description

Technical Field

[0001] This invention relates to the field of composite plastic strength testing technology, and more specifically to a strength testing device for the production of composite packaging bags. Background Technology

[0002] For composite packaging bags, mechanical properties such as tensile strength, tear strength, and heat seal strength are the core indicators for judging whether their quality meets the standards. The quality of these properties directly affects the structural stability and safety of the packaging bag during transportation, storage, and daily use.

[0003] Mechanical property testing of composite packaging bags is mostly carried out using dedicated tensile testing machines. By applying tensile loads to the samples, parameters such as tensile strength and elongation at break are obtained. However, existing testing equipment still has many shortcomings in practical applications: the film samples are soft and smooth, making it difficult to quickly achieve top-to-bottom centering and symmetrical clamping when manually held, which is cumbersome and inefficient. The clamps are prone to causing sample damage, skewness, or slippage, leading to stress concentration and distorted test results. At the same time, traditional testing methods often require pre-cutting standard samples and then gradually centering and installing the standard samples on the clamps, which involves complex tools and cannot meet the needs of rapid testing on production lines.

[0004] To address the aforementioned technical deficiencies, a solution is proposed. Summary of the Invention

[0005] This invention provides a strength testing device for the production of composite packaging bags, which solves the problem that when cutting standard samples, soft packaging bag samples are gradually aligned and installed on the clamp, and the samples are prone to displacement after clamping, resulting in a decrease in accuracy.

[0006] To achieve convenient operation, rapid centering, and minimal deviation during clamping, the present invention is implemented through the following technical solution: a strength testing device for composite packaging bag production, comprising a testing machine, wherein a lifting rod is provided on the testing machine, and a clamp is provided at the bottom of the lifting rod, the number of clamps being two and symmetrically distributed vertically, and a cutting mechanism is provided between the two clamps, the cutting mechanism being used to cut the packaging bag into standard samples while clamping; The cutting mechanism includes a clamping block one and a clamping block two. The clamping block one is slidably connected to the clamping head, and the clamping block two is fixedly connected to the clamping head. A cutting blade is fixedly connected to the center of the clamping block one near the clamping block two. A receiving groove is provided on the clamping block two. When the clamping block one and the clamping block two are in contact, the cutting blade is engaged with the receiving groove. A guide rail is fixedly connected to the top of the clamping block one located below. An installation rod is slidably connected in the guide rail. Two movable blades are fixedly connected on the installation rod. The two movable blades and the two upper and lower cutting blades are located on the same vertical line. Two movable rods are slidably provided at both the front and rear ends of the bottom of the lifting rod. A rotating joint is provided between the two movable rods. A right-angle piece is fixedly connected to the bottom end of the lower movable rod. The inside corner of the right-angle piece is in contact with the installation rod. The upper clamp is detachably connected to the lifting rod and the testing machine, while the lower clamp is fixedly connected to the testing machine.

[0007] Furthermore, the bottom of the lifting rod is fixedly connected to slide rails at both the front and rear ends, and the slide rails are embedded with and slidably connected to protrusions, which are integrally formed with the top of the upper movable rod.

[0008] Furthermore, a connecting cylinder is fixedly connected to the bottom of the lifting rod, an electromagnet is fixedly installed inside the connecting cylinder, and an armature is fixedly connected to the top of the upper clamp. When the electromagnet is energized, the electromagnet and the armature are magnetically connected.

[0009] Furthermore, a positioning slot is fixedly connected to the top of the clamping block two located below. When the cutting blade is engaged with the receiving slot, the positioning slot contacts the movable blade.

[0010] Furthermore, both the lifting rod and the testing machine are equipped with a driving unit. The two driving units are symmetrically distributed vertically. The driving units are used to drive the movable end of the rotary joint to rotate and drive the clamping block to move in one direction toward the clamping block.

[0011] Furthermore, both drive units include motors, one motor is fixedly connected to the lifting rod, and the other motor is fixedly connected to the testing machine. A rotating shaft is fixedly connected to the output end of the motor, and a gear one and a bevel gear two are fixedly connected to the rotating shaft. A central hole and a through hole are opened on the right side of the chuck. A threaded rod is slidably connected in the central hole, and a limiting rod is inserted in the through hole. One end of the threaded rod and the limiting rod located in the chuck are fixedly connected to a clamping block one. A rotating cylinder is threadedly connected to the end of the threaded rod away from the clamping block one. Gear two is fixedly connected to the outer wall of the rotating cylinder, and gear two meshes with gear one. The rotating drum is rotatably connected to the chuck via a mounting component.

[0012] Furthermore, connecting rods are fixedly connected to the movable ends of the two rotating joints at the front and rear, and bevel gear one is fixedly connected to the connecting rods. When clamping block one contacts clamping block two, bevel gear one meshes with bevel gear two.

[0013] Furthermore, a mounting frame is fixedly connected to the testing machine, and two vertically distributed fixing clips are fixedly installed on both the mounting frame and the testing machine.

[0014] The present invention has the following beneficial effects: This strength testing device for composite packaging bag production improves production efficiency by using a cutting mechanism to clamp and cut standard samples simultaneously. The cutting of the sample is achieved by the simultaneous shortening of the distance between clamping blocks one and two, merging production steps. Manual operation only requires stretching the film onto four fixed clamps. The device also utilizes a lifting rod with its own lifting function to drive the movable blade upwards for side cutting of the sample. After cutting, the clamping head has a limiting space created by the engagement of the cutting blade and the receiving groove, restricting the film sample's offset during stretching. This cutting capability is achieved without adding additional drive to the testing machine. Furthermore, the downward trajectory of the lifting rod rotates the movable rod that drives the movable blade, pushing out the remaining material after sample cutting and removing it to prevent it from affecting the strength test results.

[0015] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle; Figure 3 This is a schematic diagram of a clamp structure provided at the bottom of the lifting rod of the present invention; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the structure of the lifting rod with a slide rail fixedly connected to the bottom; Figure 6 for Figure 5 Schematic diagram of the structure at point B; Figure 7 This is a schematic diagram of the structure of the clamping head of the present invention, which includes a clamping block 1 and a clamping block 2. Figure 8 This is a schematic diagram of the structure of the clamping block 2 of the present invention having a receiving groove; Figure 9 This is a schematic diagram of the structure of the movable rod with an integrally formed protrusion at the top; Figure 10 for Figure 9 Enlarged schematic diagram of the structure at point C; Figure 11This is a schematic diagram of the structure of the movable rod of the present invention having a rotating pair; Figure 12 for Figure 11 A magnified schematic diagram of the structure at point D.

[0017] In the diagram: 1. Inspection machine; 2. Lifting rod; 3. Chuck; 4. Clamping block one; 5. Clamping block two; 6. Mounting frame; 7. Fixing clamp; 8. Motor; 9. Rotating shaft; 10. Gear one; 11. Armature; 12. Gear two; 13. Rotating cylinder; 14. Threaded rod; 15. Limiting rod; 16. Slide rail; 17. Protrusion; 18. Movable rod; 19. Rotating pair; 20. Connecting rod; 21. Bevel gear one; 22. Bevel gear two; 23. Connecting cylinder; 24. Electromagnet; 25. Cutting blade; 26. Receiving groove; 27. Movable blade; 28. Mounting rod; 29. ​​Positioning slot; 30. Right-angle piece; 31. Guide rail; 32. Mounting component.

[0018] The specific implementation methods, features, and effects are detailed below.

[0019] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0020] Please see Figures 1-12 This invention provides a technical solution: a strength testing device for composite packaging bag production, comprising a testing machine 1, a mounting frame 6 fixedly connected to the testing machine 1, two vertically distributed clamps 7 fixedly installed on both the mounting frame 6 and the testing machine 1, a lifting rod 2 provided on the testing machine 1, and a clamp 3 provided at the bottom of the lifting rod 2, the number of clamps 3 being two and symmetrically distributed vertically, the upper clamp 3 being detachably connected to the lifting rod 2 and the testing machine 1, and the lower clamp 3 being fixedly connected to the testing machine 1, a cutting mechanism being provided between the two clamps 3, the cutting mechanism being used to cut the packaging bag into standard samples while clamping.

[0021] The specific structure and working principle of the testing machine 1 are all existing technologies. The lower clamp 3, the lower motor 8, and the mounting bracket 6 are all fixedly installed on the base of the testing machine 1. The testing machine 1 is fixedly installed with a control host. The motor 8 is a servo motor, and its encoder is fixed on the motor 8. The controller is installed in the control host. The fixed clamp 7 is existing technology. One end is a fixed end, and the other end is a movable end. After the fixed clamp 7 is closed, its clamping surface is on the same plane as the plane where the sample is tested. The rear end of the testing machine 1 is equipped with a movable frame that can be temporarily stopped. The movable frame is part of the testing machine 1 and is also existing technology. The movable end of the movable frame is detachably connected to the upper clamp 3 by bolts. When the lifting rod 2 moves the upper clamp 3 upward, the movable end of the movable frame moves upward. When the lifting rod 2 separates from the upper clamp 3, the movable end of the movable frame remains stationary, and the upper clamp 3 remains at the same height as the movable end of the movable frame at the moment of separation.

[0022] The cutting mechanism includes clamping block 4 and clamping block 5. Clamping block 4 is slidably connected to clamping head 3, and clamping block 5 is fixedly connected to clamping head 3. A cutting blade 25 is fixedly connected to the center of clamping block 4 near clamping block 5. A receiving groove 26 is provided on clamping block 5. When clamping block 4 and clamping block 5 are in contact, the cutting blade 25 is engaged with the receiving groove 26. A guide rail 31 is fixedly connected to the top of clamping block 4 located below. An installation rod 28 is slidably connected in the guide rail 31. Two movable blades 27 are fixedly connected to the installation rod 28. The two movable blades 27 and the two cutting blades 25 are located on the same vertical line. Two movable rods 18 are slidably provided at the front and rear ends of the bottom of the lifting rod 2. A rotating joint 19 is provided between the two movable rods 18. A right-angle piece 30 is fixedly connected to the bottom end of the lower movable rod 18. The inside corner of the right-angle piece 30 is in contact with the installation rod 28.

[0023] The cutting blade has the same specifications as the test sample.

[0024] During operation, the four corners of the packaging bag to be inspected are clamped and fixed by the mounting bracket 6 and the four fixing clamps 7 on the inspection machine 1, so that the packaging bag is kept in a straight and flat initial state. The motors 8 of the upper and lower drive units are started simultaneously. The motors 8 drive the corresponding rotating shafts 9 to rotate. The rotating shafts 9 drive the gear 10 and the bevel gear 22 fixed on them to rotate synchronously. The gear 10 meshes with the corresponding gear 2 12. The gear 2 12 drives the rotating drum 13 to rotate stably relative to the corresponding chuck 3 through the mounting part 32. The threaded rod 14 and the rotating drum 13 form a threaded transmission engagement. Under the guidance and constraint of the limit rod 15, the clamping block 1 4 is pushed to move smoothly towards the clamping block 2 5. The vertical guide rail 31, the mounting rod 28 and the movable blade 27 located on the lower clamping block 1 4 move synchronously with the lower clamping block 1 4. The end of 28 pushes the right-angle piece 30 to move synchronously. The right-angle piece 30 drives the lower movable rod 18 to move horizontally. The static damping torque of the damping shaft in the rotating pair 19 is greater than the deflection torque generated by the movable rod 18 during the translation process, so that the movable end of the rotating pair 19 remains locked and does not rotate. It only moves horizontally with the movable rod 18 as a whole. The protrusion 17, which is integrally formed with the upper movable rod 18, slides smoothly along the slide rail 16 at the bottom of the lifting rod 2. That is, both movable rods 18 move horizontally to the left. The rotating pair 19, the connecting rod 20 and the bevel gear 21 fixed on the connecting rod 20 move horizontally synchronously until the clamping block 4 and the clamping block 5 are in complete contact and fit together. The cutting blade 25, which is fixed in the center on the clamping block 4, penetrates the packaging bag and is embedded in the receiving groove 26 on the clamping block 5, completing the center cutting and shaping of the sample end.

[0025] The bottom of the lifting rod 2 is fixedly connected to the front and rear ends of the slide rail 16. The slide rail 16 is embedded and slidably connected to the protrusion 17. The protrusion 17 is integrally formed with the top of the upper movable rod 18. The bottom of the lifting rod 2 is fixedly connected to the connecting cylinder 23. The electromagnet 24 is fixedly installed inside the connecting cylinder 23. The top of the upper clamp 3 is fixedly connected to the armature 11. When the electromagnet 24 is energized, the electromagnet 24 and the armature 11 are magnetically connected. The top of the lower clamping block 2 5 is fixedly connected to the positioning slot 29. When the cutting blade 25 is engaged with the receiving slot 26, the positioning slot 29 contacts the movable blade 27.

[0026] Electromagnet 24 is existing technology, and the attraction force of electromagnet 24 is greater than the maximum tensile force of testing machine 1.

[0027] Both the lifting rod 2 and the testing machine 1 are equipped with a drive unit. The two drive units are symmetrically distributed vertically. The drive units are used to drive the movable end of the rotating pair 19 to rotate and drive the clamping block 1 4 to move closer to the clamping block 2 5. Both drive units include a motor 8. One motor 8 is fixedly connected to the lifting rod 2, and the other motor 8 is fixedly connected to the testing machine 1. The output end of the motor 8 is fixedly connected to a rotating shaft 9. Gear 1 10 and bevel gear 2 22 are fixedly connected to the rotating shaft 9. The right side of the chuck 3 has a central hole and a through hole. A threaded rod 14 is slidably connected in the central hole, and a limiting rod 15 passes through the through hole. The ends of the threaded rod 14 and the limiting rod 15 located in the chuck 3 are fixedly connected to the clamping block 1 4. The end of the threaded rod 14 away from the clamping block 1 4 is threadedly connected to a rotating cylinder 13. Gear 2 12 is fixedly connected to the outer wall of the rotating cylinder 13. Gear 2 12 meshes with gear 1 10.

[0028] The movable blade 27 penetrates the packaging bag and engages with the positioning slot 29 on the lower clamping block 2 5. The first bevel gear 21 precisely meshes with the corresponding second bevel gear 22. The upper and lower motors 8 stop operating synchronously, disconnecting the power supply to the electromagnet 24 in the connecting cylinder 23, causing the electromagnet 24 to magnetically separate from the armature 11 at the top of the upper chuck 3. The lifting rod 2 disengages from the upper chuck 3. The upper chuck 3 is held at the vertical height position at the moment of separation by the movable frame with temporary stop self-locking at the rear end of the testing machine 1. The testing machine 1 drives the lifting rod 2 to move vertically upward. The slide rail 16, movable rod 18, protrusion 17, rotating joint 19, connecting rod 20, and first bevel gear 21 are all involved. The motor 8, rotating shaft 9, and bevel gear 22 fixed on the lifting rod 2 move upward synchronously with the lifting rod 2. The meshing center distance between bevel gear 1 21 and bevel gear 22 remains unchanged throughout the entire process and maintains a stable meshing state. Gear 1 10 and gear 2 12 disengage due to the fixed position of the upper clamp 3 and the upward movement of the lifting rod 2. The right-angle piece 30 rises synchronously with the movable rod 18 and pulls the mounting rod 28 to slide vertically upward along the vertical guide rail 31. The movable blade 27 moves upward synchronously with the mounting rod 28 to continuously cut the packaging bag vertically on the side until the movable blade 27 moves upward to the position where a safety gap is reserved at the bottom of the upper cutting blade 25. The inspection machine 1 then stops driving the lifting rod 2 upward.

[0029] The rotating drum 13 is rotatably connected to the chuck 3 via the mounting part 32. The two rotating pairs 19 at the front and rear are fixedly connected to the movable ends of the connecting rods 20. A bevel gear 21 is fixedly connected to the connecting rods 20. When the clamping block 4 contacts the clamping block 5, the bevel gear 21 meshes with the bevel gear 22.

[0030] The mounting member 32 is a "C"-shaped workpiece. One end of the mounting member 32 is fixedly connected to the chuck 3, and the other end of the mounting member 32 is rotatably connected to the rotating cylinder 13. The connecting rod 20 and the rotating shaft of the rotating pair 19 are located on the same straight line, and the connecting rod 20 is fixedly connected to the rotating shaft of the rotating pair 19. The rotating shaft of the rotating pair 19 is a damping rotating shaft, and the damping rotating shaft enables the movable end of the rotating pair 19 to remain stationary when the mounting rod 28 pushes the movable rod 18 through the right-angle member 30.

[0031] Subsequently, the testing machine 1 drives the lifting rod 2 to move vertically downward, so that the electromagnet 24 and the armature 11 come into contact and fit again, and the first gear 10 and the second gear 12 resume meshing. During the downward movement of the lifting rod 2, the upper motor 8 located on the lifting rod 2 is started. The upper motor 8 drives the corresponding rotating shaft 9 and the bevel gear 22 to rotate. The bevel gear 22 meshes and drives the bevel gear 21 to rotate. The driving torque of the bevel gear 21 is greater than the static damping torque of the damping rotating shaft in the rotating pair 19, driving the connecting rod 20 and the movable end of the rotating pair 19 to rotate synchronously. The lower movable rod 18 deflects to the left along with the rotating pair 19, pushing away the excess packaging bag waste generated after cutting. After the waste is cleared, the upper motor 8 stops running, the power supply of the electromagnet 24 is turned on, and the electromagnet 24 and the armature 11 are stably attracted, realizing the rigid connection and fixation of the upper chuck 3 and the lifting rod 2. The testing machine 1 drives the lifting rod 2 to move vertically upward, conducts a tensile strength test on the cut standard specimen and collects the corresponding mechanical property data. After the test is completed, the upper and lower groups of motors 8 are driven to rotate synchronously in the reverse direction, and the threaded rod 14 drives the first clamping block 4 to move back in the direction away from the second clamping block 5. The movable rod 18, the mounting rod 28 and the movable blade 27 return to their initial positions synchronously.

[0032] Working principle: During operation, the four corners of the packaging bag to be inspected are clamped and fixed by the mounting frame 6 and the four fixing clamps 7 on the inspection machine 1, so that the packaging bag is kept in a straight and flat initial state. The motors 8 of the upper and lower drive units are started simultaneously. The motors 8 drive the corresponding rotating shafts 9 to rotate. The rotating shafts 9 drive the gear 10 and the bevel gear 22 fixed on them to rotate synchronously. The gear 10 meshes with the corresponding gear 2 12. The gear 2 12 drives the rotating drum 13 to rotate stably relative to the corresponding clamp 3 through the mounting part 32. The threaded rod 14 and the rotating drum 13 form a threaded transmission engagement. Under the guidance and constraint of the limit rod 15, the clamping block 4 is pushed to move smoothly towards the clamping block 5. The vertical guide rail 31, the mounting rod 28 and the movable blade on the lower clamping block 4 are connected. The piece 27 moves synchronously with the lower clamping block 4. The end of the mounting rod 28 pushes the right-angle piece 30 to move synchronously. The right-angle piece 30 drives the lower movable rod 18 to move horizontally. The static damping torque of the damping shaft in the rotating joint 19 is greater than the deflection torque generated by the movable rod 18 during the translation process, so that the movable end of the rotating joint 19 remains locked and does not rotate, but only moves horizontally with the movable rod 18 as a whole. The protrusion 17, which is integrally formed with the upper movable rod 18, slides smoothly along the slide rail 16 at the bottom of the lifting rod 2. That is, both movable rods 18 move horizontally to the left. The rotating joint 19, the connecting rod 20, and the bevel gear 21 fixed on the connecting rod 20 move horizontally synchronously until the clamping block 4 and the clamping block 5 are in complete contact and fit together. The cutting blade 25, which is fixed in the center on the clamping block 4, penetrates. The packaging bag is embedded in the receiving groove 26 on the clamping block 25, completing the centering and shaping of the sample end. The movable blade 27 penetrates the packaging bag and engages with the positioning slot 29 on the lower clamping block 25 for positioning. The bevel gear 1 21 precisely meshes with the corresponding bevel gear 22. The upper and lower motors 8 stop operating synchronously, disconnecting the power supply to the electromagnet 24 in the connecting cylinder 23, causing the electromagnet 24 to magnetically separate from the armature 11 at the top of the upper clamp 3. The lifting rod 2 disengages from the upper clamp 3. The upper clamp 3 is held at the vertical height position at the moment of separation by the movable frame with temporary stop self-locking at the rear end of the testing machine 1. The testing machine 1 drives the lifting rod 2 to move vertically upward. Slide rail 16, movable rod 18, protrusion 17, rotating pair 19, connecting rod 20 The bevel gear 21, motor 8, shaft 9, and bevel gear 22, all fixed to the lifting rod 2, move upwards synchronously with the lifting rod 2. The meshing center distance between bevel gear 21 and bevel gear 22 remains constant throughout the entire movement, maintaining a stable meshing state. Gear 10 and gear 212 disengage due to the fixed position of the upper clamp 3 and the upward movement of the lifting rod 2. The right-angle piece 30 rises synchronously with the movable rod 18, pulling the mounting rod 28 to slide vertically upwards along the vertical guide rail 31. The movable blade 27 moves upwards synchronously with the mounting rod 28, continuously cutting the packaging bag vertically along the side until the movable blade 27 reaches the position where a safety gap is reserved at the bottom of the upper cutting blade 25. At this point, the inspection machine 1 stops driving the lifting rod 2 upwards, and then drives the lifting rod 2 to move vertically downwards.The electromagnet 24 and armature 11 are brought back into contact and engaged, and gear 10 and gear 2 are re-engaged. During the downward movement of the lifting rod 2, the upper motor 8 located on the lifting rod 2 is activated. The upper motor 8 drives the corresponding rotating shaft 9 and bevel gear 22 to rotate. Bevel gear 22 engages and drives bevel gear 1 to rotate. The driving torque of bevel gear 1 is greater than the static damping torque of the damping shaft inside the rotating pair 19, causing the connecting rod 20 and the movable end of the rotating pair 19 to rotate synchronously. The lower movable rod 18 deflects to the left with the rotating pair 19, pushing away the excess bag generated after the cutting is completed. After the bagged waste is cleaned, the upper motor 8 stops running, and the power supply to the electromagnet 24 is turned on, causing the electromagnet 24 to stably engage with the armature 11, achieving a rigid connection and fixation between the upper clamp 3 and the lifting rod 2. The testing machine 1 drives the lifting rod 2 to move vertically upward, performing tensile strength testing on the cut standard sample and collecting the corresponding mechanical property data. After the test is completed, the upper and lower motors 8 are driven to rotate synchronously in opposite directions. The threaded rod 14 drives the clamping block 4 to move away from the clamping block 5 and reset. The movable rod 18, the mounting rod 28, and the movable blade 27 synchronously return to their initial positions.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A strength testing device for composite packaging bag production, comprising a testing machine (1), characterized in that: The testing machine (1) is equipped with a lifting rod (2), and a clamp (3) is provided at the bottom of the lifting rod (2). There are two clamps (3) and they are symmetrically distributed up and down. A cutting mechanism is provided between the two clamps (3). The cutting mechanism is used to cut the packaging bag into standard samples while clamping. The cutting mechanism includes a clamping block one (4) and a clamping block two (5). The clamping block one (4) is slidably connected to the clamp (3), and the clamping block two (5) is fixedly connected to the clamp (3). A cutting blade (25) is fixedly connected to the center of the clamping block one (4) near the clamping block two (5). A receiving groove (26) is provided on the clamping block two (5). When the clamping block one (4) and the clamping block two (5) are in contact, the cutting blade (25) is engaged with the receiving groove (26). A guide rail is fixedly connected to the top of the clamping block one (4) located below. 31), a mounting rod (28) is slidably connected inside the guide rail (31). Two movable blades (27) are fixedly connected on the mounting rod (28). The two movable blades (27) and the upper and lower cutting blades (25) are located on the same vertical line. Two movable rods (18) are slidably set at the front and rear ends of the bottom of the lifting rod (2). A rotating pair (19) is set between the two movable rods (18). A right-angle piece (30) is fixedly connected to the bottom end of the lower movable rod (18). The inside corner of the right-angle piece (30) contacts the mounting rod (28). The upper clamp (3) is detachably connected to the lifting rod (2) and the testing machine (1), while the lower clamp (3) is fixedly connected to the testing machine (1).

2. The strength testing device for composite packaging bag production according to claim 1, characterized in that: The lifting rod (2) has slide rails (16) fixedly connected to both the front and rear ends of the bottom. The slide rails (16) are embedded and slidably connected to protrusions (17). The protrusions (17) are integrally formed with the top of the upper movable rod (18).

3. The strength testing device for composite packaging bag production according to claim 1, characterized in that: The bottom of the lifting rod (2) is fixedly connected to a connecting cylinder (23), and an electromagnet (24) is fixedly installed inside the connecting cylinder (23). The top of the clamp (3) located above is fixedly connected to an armature (11). When the electromagnet (24) is energized, the electromagnet (24) and the armature (11) are magnetically connected.

4. The strength testing device for composite packaging bag production according to claim 1, characterized in that: The clamping block 2 (5) located below is fixedly connected to a positioning slot (29) at its top. When the cutting blade (25) is engaged with the receiving groove (26), the positioning slot (29) contacts the movable blade (27).

5. The strength testing device for composite packaging bag production according to claim 1, characterized in that: Both the lifting rod (2) and the testing machine (1) are equipped with driving units. The two driving units are symmetrically distributed vertically. The driving units are used to drive the moving end of the rotating pair (19) to rotate and drive the clamping block one (4) to move closer to the clamping block two (5).

6. The strength testing device for composite packaging bag production according to claim 5, characterized in that: Both drive units include motors (8), one motor (8) is fixedly connected to the lifting rod (2), and the other motor (8) is fixedly connected to the testing machine (1). The output end of the motor (8) is fixedly connected to a rotating shaft (9). A gear one (10) and a bevel gear two (22) are fixedly connected on the rotating shaft (9). A central hole and a through hole are provided on the right side of the chuck (3). A threaded rod (14) is slidably connected in the central hole. A limiting rod (15) is passed through the through hole. One end of the threaded rod (14) and the limiting rod (15) located in the chuck (3) are fixedly connected to the clamping block one (4). A rotating cylinder (13) is threadedly connected to the end of the threaded rod (14) away from the clamping block one (4). A gear two (12) is fixedly connected to the outer wall of the rotating cylinder (13). The gear two (12) meshes with the gear one (10). The rotating drum (13) is rotatably connected to the chuck (3) via the mounting component (32).

7. A strength testing device for composite packaging bag production according to claim 6, characterized in that: A connecting rod (20) is fixedly connected to the movable end of the two rotating joints (19) at the front and rear. A bevel gear (21) is fixedly connected to the connecting rod (20). When the clamping block (4) contacts the clamping block (5), the bevel gear (21) meshes with the bevel gear (22).

8. The strength testing device for composite packaging bag production according to claim 1, characterized in that: The testing machine (1) is fixedly connected to a mounting frame (6), and two vertically distributed fixing clips (7) are fixedly installed on both the mounting frame (6) and the testing machine (1).

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