CN118583627A - Plastic packaging bag stretching detection device - Google Patents

Abstract

The invention discloses a plastic packaging bag stretching detection device which comprises a workbench, wherein a bidirectional ball screw is transversely arranged above the workbench, first rotary bearing seats are arranged at two ends of the bidirectional ball screw, a second rotary bearing seat is arranged in the middle of the bidirectional ball screw, the first rotary bearing seat and the second rotary bearing seat are fixedly connected with the top of the workbench, and a rotary motor is arranged outside the first rotary bearing seat at one end of the bidirectional ball screw. The beneficial effects of the invention are as follows: the invention has reasonable design, stable and firm overall structure and strong practicability, and can synchronously stretch and detect two plastic packaging bags at the same time, thereby improving the detection efficiency; meanwhile, the phenomenon that the parts of the plastic packaging bag are easy to collide after being stretched and broken can be avoided, so that the use safety is improved; in addition, can also cut the local region of plastic packaging bag and carry out tensile detection, improve the accuracy of testing result.

Description

A plastic packaging bag stretch detection device

Technical Field

The invention relates to the technical field of plastic packaging bag detection, in particular to a plastic packaging bag stretching detection device.

Background Art

Plastic packaging bags are made of plastic as raw materials and are used to produce various daily necessities. They are essential items in people's daily lives and are often used to hold other items. Since plastic is relatively cheap to produce and extremely light, the plastic packaging bags produced not only have a large capacity but are also easy to store, so plastic packaging bags are widely used in daily life and industrial production. After the plastic packaging bags are manufactured, samples need to be taken for tensile performance testing to ensure the product quality of the plastic packaging bags.

Chinese patent CN218674529U discloses a heavy object lifting safety test device for plastic packaging bags. When clamping and fixing the plastic bag, on the one hand, the contact area between the plastic bag and the plastic bag can be increased to improve the fixing effect of the plastic bag. On the other hand, the fixed plastic bag is bent between the first step and the second step, so that the fixed plastic bag is not easy to slide, further improving the fixing effect of the plastic bag. However, during the tensile test, only a single plastic packaging bag can be tested for tensile performance each time, the detection efficiency is low and the detection result is not accurate enough. At the same time, after the plastic packaging bag is stretched and broken, the hook used to stretch the plastic packaging bag will drive the inertial force of the stretching, collide with the equipment, and cause certain damage. After long-term use, the service life of the equipment will be reduced, and further development and improvement are needed.

Summary of the invention

The purpose of the present invention is to provide a plastic packaging bag stretching detection device to solve the problems that the existing device for testing the tensile properties of plastic packaging bags can only perform tensile properties test on a single plastic packaging bag at a time, the detection efficiency is low and the detection results are not accurate enough. At the same time, after the plastic packaging bag is stretched and broken, collisions are likely to occur between the components of the detection device.

The present invention achieves the above-mentioned purpose through the following technical scheme: a plastic packaging bag stretching detection device, comprising a workbench, a bidirectional ball screw is arranged horizontally above the workbench, a first rotating bearing seat is arranged at both ends of the bidirectional ball screw, a second rotating bearing seat is arranged in the middle of the bidirectional ball screw, the first rotating bearing seat and the second rotating bearing seat are both fixedly connected to the top of the workbench, a rotating motor is arranged on the outside of the first rotating bearing seat at one end of the bidirectional ball screw, the output end of the rotating motor is connected to one end of the bidirectional ball screw, stretching components are symmetrically arranged on the bidirectional ball screw on both sides of the second rotating bearing seat, a fixed limit component is arranged on the top of the workbench corresponding to the position of the first rotating bearing seat, and a control device is arranged on the outer surface of one longitudinal side of the workbench.

Furthermore, the stretching assembly includes a U-shaped movable support frame and a ball nut installed on a bidirectional ball screw, the two ends of the bottom of the U-shaped movable support frame are respectively connected to the two ends of the longitudinal direction of the top of the workbench in a sliding manner in the transverse direction, the ball nut is connected to the inner surface of the bottom of the U-shaped movable support frame, a limiting pressure plate is provided on one side of the U-shaped movable support frame laterally away from the fixed limiting assembly, and a movable support plate is provided on the other side, the limiting pressure plate is provided with a plurality of plug-in support connecting rods equidistantly along the longitudinal direction, the plug-in support connecting rods are all plug-in connected to the U-shaped movable support frame, one end of the plug-in support connecting rod passes through the U-shaped movable support frame and is connected to the movable support plate, a first lifting and lowering plate is provided above the movable support plate, and the first The lifting and lowering pressure plates are provided with first guide plug-in rods at both ends of the bottom, and the first guide plug-in rods are plug-connected with the movable support plate. The bottom of the movable support plate is located inside the first guide plug-in rod and a first lifting device is provided. The top output end of the first lifting device passes through the movable support plate and is connected with the bottom of the first lifting and lowering pressure plate. The top of the movable support plate is provided with a first arc-shaped limiting groove, and the bottom of the first lifting and lowering pressure plate is provided with a first arc-shaped limiting protrusion at the position of the first arc-shaped limiting groove. Buffers are provided at both longitudinal ends of the U-shaped movable support frame corresponding to the positions of the movable support plates, and pressure sensors are provided on the surface of the U-shaped movable support frame that is horizontally close to the limiting pressure plate and is located between the plug-in support connecting rods.

Furthermore, the fixed limiting assembly includes a U-shaped fixed support seat, the U-shaped fixed support seat is arranged on the top of the workbench corresponding to the middle position of the bidirectional ball screw, a fixed support plate is arranged in the middle of the top of the U-shaped fixed support seat, a supporting top plate is arranged on the top of the fixed support plate, a second lifting device is arranged on the top of the supporting top plate at both sides of the horizontal direction of the fixed support plate, the output end of the second lifting device extends to the bottom of the supporting top plate and a second lifting and pressure plate is installed, the top of the second lifting and pressure plate is arranged on both sides of the longitudinal direction of the second lifting device, the second guide plug-in rod is plugged into the supporting top plate, and the bottom of the second lifting and pressure plate A second arc-shaped limiting protrusion is provided on the top of the U-shaped fixed support seat, and a second arc-shaped limiting groove is provided on the top of the U-shaped fixed support seat corresponding to the position of the second arc-shaped limiting protrusion. A U-shaped support mounting frame is provided between the support top plate and the second lifting device. A movable support mounting plate is connected to the top of the U-shaped support mounting frame along the longitudinal sliding connection, and a driving motor is provided on the top of the movable support mounting plate. A walking wheel is installed on the bottom output end of the driving motor through the movable support mounting plate, and the circumferential outer surface of the walking wheel is in contact with the lateral side surface of the U-shaped support mounting frame. CCD cameras are provided at both ends of the bottom of the movable support mounting plate, and a highly transparent protective cover is provided on the outside of the CCD camera.

Furthermore, an auxiliary workbench is provided on the outer surface of one longitudinal side of the workbench away from the control device, a fixed limit seat is provided on the top of the auxiliary workbench, a cutting assembly is provided on the top of the auxiliary workbench at the side of the fixed limit seat longitudinally away from the workbench, the cutting assembly and the auxiliary workbench are slidingly connected along the longitudinal direction, a moving mechanism is provided between the lateral side of the cutting assembly and the auxiliary workbench, a third lifting device is recessed at both lateral ends of the fixed limit seat, and a third lifting and pressing plate is provided between the tops of the third lifting devices.

Furthermore, the cutting assembly includes a U-shaped movable support seat, the U-shaped movable support seat is connected to the top of the auxiliary workbench in a longitudinal sliding manner, the movable mechanism is arranged between a lateral side of the U-shaped movable support seat and the auxiliary workbench, a U-shaped fixed mounting plate is arranged on the top of the U-shaped movable support seat, a fourth lifting device is arranged on the top of the U-shaped fixed mounting plate, the bottom output end of the fourth lifting device extends into the U-shaped fixed mounting plate, and a lifting support mounting plate is installed on the inner side, a cutting knife is installed at the bottom of the lifting support mounting plate, and a third guide plug-in rod is arranged on the top of the lifting support mounting plate on both lateral sides of the fourth lifting device, and the third guide plug-in rod is connected to the U-shaped fixed mounting plate The plates are plug-in connected, and a positioning frame is slidably connected between the inner surfaces on both sides of the U-shaped fixed mounting plate in the vertical direction, and a cutting groove is arranged on the top of the U-shaped movable support seat corresponding to the position of the cutting knife, and a fifth lifting device is recessed on both sides of the cutting groove at the top of the U-shaped movable support seat, and the top output end of the fifth lifting device is connected to the bottom of the positioning frame, and a fixed splint is arranged on the side of the U-shaped movable support seat away from the workbench, and support screws are plug-in installed on both ends of the fixed splint, one end of the support screw is connected to the U-shaped movable support seat, and a limiting nut is threadedly installed on the other end, and a spring is arranged on the support screw between the limiting nut and the fixed splint.

Furthermore, linear bushings are provided between the plug-in support connecting rod and the U-shaped movable support frame, between the first guide plug-in rod and the movable support plate, between the second guide plug-in rod and the support top plate, and between the third guide plug-in rod and the U-shaped fixed mounting plate.

Furthermore, displacement sensors are provided on the bottom inner surface of the U-shaped movable support frame located on one longitudinal side of the ball nut and on the bottom inner surface of the U-shaped movable support seat.

Furthermore, the rotating motor, the third lifting device, the displacement sensor, the first lifting device, the pressure sensor, the second lifting device, the driving motor, the CCD camera, the fourth lifting device and the fifth lifting device are all electrically connected to the control device.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention has a reasonable design, a stable and firm overall structure, and strong practicability. It can not only perform synchronous stretching tests on two plastic packaging bags at the same time, thereby improving the detection efficiency; it can also avoid the phenomenon that the components of the plastic packaging bags are prone to collision after being stretched and broken, and monitor the shape changes of the plastic packaging bags themselves during the stretching test in real time, thereby improving the safety of use; in addition, it can also cut a local area of the plastic packaging bag for stretching testing, and after comprehensive comparison, improve the accuracy of the test results;

2. Specifically, by symmetrically arranging the stretching components on the two-way ball screws on both sides of the second rotating bearing seat, when the two-way ball screws rotate, the two stretching components can move in opposite directions relative to each other, and cooperate with the fixed limit component, so as to realize synchronous stretching detection of the two plastic packaging bags, thereby improving the detection efficiency; by the cooperation of the ball nut and the two-way ball screw, the U-shaped movable support frame is driven to move, so as to realize stable and accurate application of tension to one end of the plastic packaging bag, avoiding excessive or insufficient increase of tension to affect the detection result, and improving the accuracy of the detection result; with the cooperation of the movable support plate, the plug-in support connecting rod and the limit pressure plate, the tension applied to the plastic packaging bag can be applied on the principle that the action of force is mutual, and the limit pressure plate is used with the pressure sensor to monitor the tension of the plastic packaging bag in real time. In addition, by setting the buffer, it is possible to avoid the phenomenon that the movable support plate will collide with the U-shaped movable support frame after the plastic packaging bag breaks, so as to improve the service life of the device;

3. Specifically, the fixed limit assembly cooperates with the second lifting device and the second lifting and compressing plate to realize fixed limit of one end of the plastic packaging bags on both sides. At the same time, the second arc-shaped limit groove and the second arc-shaped limit protrusion cooperate with each other, and the first arc-shaped limit groove and the first arc-shaped limit protrusion in the stretching assembly cooperate with each other, so as to avoid the phenomenon that one end of the plastic packaging bag falls off during the stretching test process, so as to improve the stability of the stretching test process. In cooperation with the stretching assemblies arranged on both sides, when the bidirectional ball screw rotates, the two plastic packaging bags are synchronously stretched and tested to improve the test efficiency. At the same time, the movable support mounting plate, the drive motor, the walking wheel and the CCD camera structure are arranged, and the data monitored by the pressure sensor arranged in the stretching assembly are coordinated to monitor the shape change of the plastic packaging bag itself when it is subjected to different tensile forces in real time.

4. Specifically, the cutting component can cut a local area of the plastic packaging bag for tensile testing by cooperating with the fixed limit seat, the third lifting device and the third lifting and compressing plate, and comprehensively analyze the tensile properties of the local area of the plastic packaging bag to improve the accuracy of the overall tensile performance test results of the plastic packaging bag; the U-shaped mobile support seat can move to different longitudinal positions to cut out local areas of the plastic packaging bag of different sizes for tensile testing; it can ensure the stability of the cutting position of the plastic packaging bag during the cutting process to avoid displacement that affects the cutting accuracy; it can make the plastic packaging bag produce a certain tension to avoid wrinkles that affect the cutting effect during cutting and sagging that affects the cutting size error.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a three-dimensional structure of the present invention;

FIG2 is a schematic diagram of the three-dimensional structure of the stretching assembly in the present invention;

FIG3 is a schematic diagram of the three-dimensional structure of the stretching assembly in the present invention from another perspective;

FIG4 is a left side view of the stretching assembly of the present invention;

FIG5 is a schematic diagram of the three-dimensional structure of the fixed limiting assembly in the present invention;

FIG6 is a front view of the fixed limit assembly of the present invention;

FIG7 is a schematic diagram of the three-dimensional structure of the cutting assembly in the present invention;

FIG. 8 is an enlarged view of portion A in FIG. 7 .

In the figure: 1-working table, 2-bidirectional ball screw, 3-first rotating bearing seat, 4-second rotating bearing seat, 5-rotating motor, 6-stretching assembly, 7-fixed limit assembly, 8-control device, 9-auxiliary working table, 10-fixed limit seat, 11-cutting assembly, 12-moving mechanism, 13-third lifting device, 14-third lifting and pressing plate, 15-displacement sensor;

601-U-shaped movable support frame, 602-ball nut, 603-limiting pressure plate, 604-movable support plate, 605-plug-in support connecting rod, 606-first lifting and lowering pressure plate, 607-first guide plug-in rod, 608-first lifting device, 609-first arc-shaped limiting groove, 610-first arc-shaped limiting protrusion, 611-buffer, 612-pressure sensor;

701-U-shaped fixed support seat, 702-fixed support plate, 703-support top plate, 704-second lifting device, 705-second lifting and lowering plate, 706-second guide plug-in rod, 707-second arc-shaped limiting protrusion, 708-second arc-shaped limiting groove, 709-U-shaped support mounting frame, 710-movable support mounting plate, 711-driving motor, 712-travel wheel, 713-CCD camera;

1101-U-shaped movable support seat, 1102-U-shaped fixed mounting plate, 1103-fourth lifting device, 1104-lifting support mounting plate, 1105-cutting knife, 1106-third guide plug-in rod, 1107-positioning frame, 1108-cutting groove, 1109-fifth lifting device, 1110-fixed splint, 1111-support screw, 1112-limiting nut, 1113-spring.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

A plastic packaging bag stretching detection device shown in Figure 1 includes a workbench 1, a bidirectional ball screw 2 is arranged horizontally above the workbench 1, first rotating bearing seats 3 are arranged at both ends of the bidirectional ball screw 2, and a second rotating bearing seat 4 is arranged in the middle of the bidirectional ball screw 2. The first rotating bearing seat 3 and the second rotating bearing seat 4 are fixedly connected to the top of the workbench 1, a rotating motor 5 is arranged on the outside of the first rotating bearing seat 3 at one end of the bidirectional ball screw 2, and the output end of the rotating motor 5 is connected to one end of the bidirectional ball screw 2. Stretching components 6 are symmetrically arranged on the bidirectional ball screw 2 on both sides of the second rotating bearing seat 4, so that the stretching components 6 on both sides of the second rotating bearing seat 4 can move in opposite directions relative to each other when the bidirectional ball screw 2 rotates. A fixed limit component 7 is arranged at the position of the first rotating bearing seat 3 on the top of the workbench 1, and a control device 8 is arranged on the outer surface of one longitudinal side of the workbench 1.

As shown in Figures 2 to 4, the stretching component 6 includes a U-shaped movable support frame 601 and a ball nut 602 installed on the bidirectional ball screw 2. The two ends of the bottom of the U-shaped movable support frame 601 are respectively connected to the two ends of the top of the workbench 1 in a horizontal sliding manner. The ball nut 602 is connected to the inner surface of the bottom of the U-shaped movable support frame 601. The U-shaped movable support frame 601 is driven to move by the transmission method coordinated by the ball nut 602 and the bidirectional ball screw 2, which can make the U-shaped movable support frame 601 move more stably, thereby stably and continuously increasing the tension on the plastic packaging bag, avoiding excessive or insufficient increase in tension to affect the detection result, so as to improve the accuracy of the detection result; a limited pressure is set on the side of the U-shaped movable support frame 601 that is laterally away from the fixed limit assembly 7 The limiting pressure plate 603 is provided with a plurality of plug-in support connecting rods 605 equidistantly arranged along the longitudinal direction, and the plug-in support connecting rods 605 are all plug-in connected with the U-shaped movable support frame 601, and one end of the plug-in support connecting rod 605 passes through the U-shaped movable support frame 601 and is connected with the movable support plate 604, and a first lifting and pressing plate 606 is arranged above the movable support plate 604, and first guide plug-in rods 607 are arranged at both ends of the bottom of the first lifting and pressing plate 606, and the first guide plug-in rod 607 is plug-in connected with the movable support plate 604, and a first lifting device 608 is arranged on the inner side of the first guide plug-in rod 607 at the bottom of the movable support plate 604, and the top output end of the first lifting device 608 passes through the movable support plate 604 and the first lifting and pressing plate 606. The bottom of a lifting and pressing plate 606 is connected, a first arc-shaped limiting groove 609 is arranged on the top of the movable support plate 604, a first arc-shaped limiting protrusion 610 is arranged at the bottom of the first lifting and pressing plate 606 corresponding to the first arc-shaped limiting groove 609, and a pressure sensor 612 is arranged between the plug-in support connecting rod 605 and the surface of the U-shaped movable support frame 601 which is horizontally close to the side of the limiting pressure plate 603. The first lifting and pressing plate 606 is driven to descend by the first lifting device 608 to fix and clamp one end of the plastic packaging bag, and the first arc-shaped limiting groove 609 and the first arc-shaped limiting protrusion 610 are arranged in cooperation to improve the fixing and clamping effect on one end of the plastic packaging bag. At the same time, the pulling force applied to the plastic packaging bag by the movement of the U-shaped movable support frame 601 will be inserted through the plug The support connecting rod 605 is transmitted to the limit pressure plate 603, and the limit pressure plate 603 will press against the pressure sensor 612, so as to monitor the size data of the tension applied to the plastic packaging bag in real time; buffers 611 are set at the positions of the movable support plates 604 at both longitudinal ends of the U-shaped movable support frame 601 to avoid the collision between the movable support plate 604 and the U-shaped movable support frame 601 after the plastic packaging bag breaks, so as to improve the service life of the device; the bidirectional ball screw 2 on both sides of the second rotating bearing seat 4 is symmetrically provided with a stretching assembly 6, and when the bidirectional ball screw 2 rotates, the two stretching assemblies will move in opposite directions relative to each other, that is, to realize the simultaneous measurement of the tensile properties of the two plastic packaging bags, which can improve the detection efficiency and the accuracy of the detection results.

As shown in Figures 5 and 6, the fixed limiting assembly 7 includes a U-shaped fixed support seat 701, which is arranged on the top of the workbench 1 at a middle position corresponding to the bidirectional ball screw 2, a fixed support plate 702 is arranged in the middle of the top of the U-shaped fixed support seat 701, a supporting top plate 703 is arranged on the top of the fixed support plate 702, and a second lifting device 704 is arranged on both sides of the fixed support plate 702 on the top of the supporting top plate 703, and the output end of the second lifting device 704 extends to the bottom of the supporting top plate 703 and is installed A second lifting and compressing plate 705 is provided, and the top of the second lifting and compressing plate 705 is provided with second guide plug rods 706 on both sides of the longitudinal direction of the second lifting device 704. The second guide plug rods 706 are plugged and connected with the support top plate 703. A second arc-shaped limiting protrusion 707 is provided at the bottom of the second lifting and compressing plate 705. A second arc-shaped limiting groove 708 is provided at the top of the U-shaped fixed support seat 701 corresponding to the second arc-shaped limiting protrusion 707, which is used to fix and limit one end of the plastic packaging bag on both sides in the horizontal direction, so as to cooperate with the two sides. The set stretching component 6 is used to test the stretching performance of the plastic packaging bag; the support top plate 703 is provided with a U-shaped support mounting frame 709 between the second lifting device 704, and the top of the U-shaped support mounting frame 709 is connected to a movable support mounting plate 710 in a longitudinal sliding manner, and a driving motor 711 is provided on the top of the movable support mounting plate 710, and the bottom output end of the driving motor 711 passes through the movable support mounting plate 710 and is provided with a walking wheel 712, and the circumferential outer surface of the walking wheel 712 is in contact with the lateral side surface of the U-shaped support mounting frame 709, and CCD cameras 713 are provided at both ends of the bottom of the movable support mounting plate 710, and a highly transparent protective cover is provided on the outside of the CCD camera 713. Through the cooperation of the driving motor 711 and the walking wheel 712, the movable support mounting plate 710 is driven to reciprocate longitudinally on the top of the U-shaped support mounting frame 709, and then the CCD cameras 713 provided at both ends of the bottom of the movable support mounting plate 710 are used to monitor the shape changes of the plastic packaging bags on both sides of the fixed limit assembly 7 during the stretching detection process in real time.

An auxiliary workbench 9 is arranged on the outer surface of the longitudinal side of the end of the workbench 1 away from the control device 8, and a fixed limit seat 10 is arranged on the top of the auxiliary workbench 9. A cutting component 11 is arranged on the top of the auxiliary workbench 9 on the side of the fixed limit seat 10 longitudinally away from the workbench 1. The cutting component 11 is slidably connected to the auxiliary workbench 9 along the longitudinal direction, and a moving mechanism 12 is arranged between the lateral side of the cutting component 11 and the auxiliary workbench 9. A third lifting device 13 is recessed at both lateral ends of the fixed limit seat 10, and a third lifting and pressing plate 14 is arranged between the tops of the third lifting device 13 for positioning and cutting the plastic packaging bag. A stretching test is performed between the fixed limit assembly 7 and the stretching assembly 6 through a local area of the plastic packaging bag, and the overall stretching performance of the plastic packaging bag is comprehensively judged to improve the accuracy of the stretching performance test results of the plastic packaging bag.

As shown in FIGS. 7 and 8 , the cutting assembly 11 includes a U-shaped movable support seat 1101, which is slidably connected to the top of the auxiliary workbench 9 in the longitudinal direction, and a movable mechanism 12 is arranged between a lateral side of the U-shaped movable support seat 1101 and the auxiliary workbench 9 so as to drive the U-shaped movable support seat 1101 to move to different longitudinal positions so as to cut out local areas of plastic packaging bags of different sizes for tensile testing; a U-shaped fixed mounting plate 1102 is arranged on the top of the U-shaped movable support seat 1101, and a fourth lifting device 1 is arranged on the top of the U-shaped fixed mounting plate 1102 103, the output end at the bottom of the fourth lifting device 1103 extends into the U-shaped fixed mounting plate 1102, and a lifting support mounting plate 1104 is installed on the inner side. A cutting knife 1105 is installed at the bottom of the lifting support mounting plate 1104. The top of the lifting support mounting plate 1104 is located on both sides of the fourth lifting device 1103. A third guide plug rod 1106 is arranged on both sides of the fourth lifting device 1103. The third guide plug rod 1106 is plug-connected with the U-shaped fixed mounting plate 1102. A positioning frame 1107 is slidably connected between the inner surfaces of the two sides of the U-shaped fixed mounting plate 1102 in the vertical direction. The U-shaped movable support seat 110 A cutting groove 1108 is arranged at the top corresponding to the position of the cutting knife 1105. A fifth lifting device 1109 is recessed and arranged on both sides of the cutting groove 1108 at the top of the U-shaped movable support seat 1101. The top output end of the fifth lifting device 1109 is connected to the bottom of the positioning frame 1107 to ensure the stability of the cutting position of the plastic packaging bag during the cutting process of the plastic packaging bag, so as to avoid displacement and affect the cutting accuracy. A fixed clamping plate 1110 is arranged on the side of the U-shaped movable support seat 1101 away from the workbench 1, and support screws are installed at both ends of the fixed clamping plate 1110. Rod 1111, one end of the support screw 1111 is connected to the U-shaped movable support seat 1101, and the other end is threadedly installed with a limiting nut 1112. The support screw 1111 is located between the limiting nut 1112 and the fixed clamp 1110, and a spring 1113 is arranged, which can pass one end of the plastic packaging bag through between the fixed clamp 1110 and the U-shaped movable support seat 1101, so that during the movement of the U-shaped movable support seat 1101, a certain tension can be generated in the plastic packaging bag to avoid wrinkles that are easy to appear during cutting and affect the cutting effect, and drooping that affects the cutting size error.

Linear bushings are arranged between the plug-in support connecting rod 605 and the U-shaped movable support frame 601, between the first guide plug-in rod 607 and the movable support plate 604, between the second guide plug-in rod 706 and the support top plate 703, and between the third guide plug-in rod 1106 and the U-shaped fixed mounting plate 1102, which can improve the smoothness of the horizontal reciprocating motion of the limit pressure plate 603 and the movable support plate 604, so as to improve the accuracy of the pressure sensor 612 in detecting the tensile force of the plastic packaging bag, and at the same time ensure the first lifting and lowering pressure. The bottom inner surface of the U-shaped movable support frame 601 on the longitudinal side of the ball nut 602 and the bottom inner surface of the U-shaped movable support seat 1101 are both provided with displacement sensors 15, so as to facilitate real-time monitoring of the positions of the U-shaped movable support frame 601 and the U-shaped movable support seat 1101, thereby facilitating monitoring of the length change of the plastic packaging bag stretching and controlling the size of the local area of the plastic packaging bag cut; the rotating motor 5, the third The lifting device 13, the displacement sensor 15, the first lifting device 608, the pressure sensor 612, the second lifting device 704, the drive motor 711, the CCD camera 713, the fourth lifting device 1103 and the fifth lifting device 1109 are all electrically connected to the control device 8, so as to receive the data transmitted in real time by the displacement sensor 15, the CCD camera 713 and the pressure sensor 612 through the control device 8, and control the working state of the rotating motor 5, the third lifting device 13, the first lifting device 608, the second lifting device 704, the drive motor 711, the fourth lifting device 1103 and the fifth lifting device 1109, wherein the first lifting device 608, the second lifting device 704, the third lifting device 13, the fourth lifting device 1103 and the fifth lifting device 1109 are one of servo electric cylinders or electric telescopic rods; in addition, the moving mechanism 12 is a rotating motor equipped with a transmission gear, and a transmission structure with a transmission rack is meshed through the transmission gear, wherein the rotating motor is also electrically connected to the control device 8.

Working principle: two plastic packaging bags to be tested are respectively fixed between the stretching assembly and the fixed limiting assembly on both sides of the second rotating bearing seat, and the first lifting and compressing plate is driven to descend by controlling the first lifting device in the stretching assembly, so that one end of the plastic packaging bag is clamped between the movable support plate and the first lifting and compressing plate, and the second lifting and compressing plate is driven to descend by controlling the second lifting device in the fixed limiting assembly, so that the other end of the plastic packaging bag is clamped between the U-shaped fixed support seat and the second lifting and compressing plate, and at the same time, the second arc-shaped limiting groove and the second arc-shaped limiting protrusion are matched, and the first arc-shaped limiting groove and the first arc-shaped limiting protrusion in the stretching assembly are matched, so as to prevent the plastic packaging bag from being stuck in the U-shaped fixed support seat and the second lifting and compressing plate. One end falls off during the stretching test; then the rotating motor can be controlled to drive the bidirectional ball screw to rotate, driving the two stretching components to move away from the fixed limit component as a whole, that is, to achieve simultaneous stretching test of the two plastic packaging bags. During the stretching test, the tension applied to the plastic packaging bag in the stretching component will act on the limit pressure plate through the plug-in support connecting rod, so that the limit pressure plate is pressed against the pressure sensor, that is, the pressure sensor is used to monitor the magnitude of the tension applied to the plastic packaging bag in real time. At the same time, the driving motor in the fixed limit component is controlled to drive the walking wheel to move, so that the movable support mounting plate can move back and forth longitudinally on the top of the U-shaped support mounting frame. The CCD cameras installed at both ends of the bottom of the support mounting plate monitor in real time the shape changes of the plastic packaging bags on both sides of the fixed limit assembly during the stretching test. In combination with the installed displacement sensor, the shape changes and deformation sizes of the plastic packaging bags when subjected to different stretching forces can be detected. When the plastic packaging bag breaks after being stretched, the installed buffer will act on the mobile support plate to avoid collision between the mobile support plate and the U-shaped mobile support frame. In addition, the control moving mechanism drives the U-shaped mobile support seat to move to a specified longitudinal position, cuts a specified local area of the plastic packaging bag, and cuts the plastic packaging bag during the movement of the U-shaped mobile support seat. In the method, the fixed splint, the supporting screw, the limiting nut and the spring are matched with each other, so that the plastic packaging bag located at the point of the U-shaped movable supporting seat and the fixed limiting seat generates a certain tension, and then the fifth lifting device can be controlled to drive the positioning frame to descend, press the designated cutting part of the plastic packaging bag, and then the fourth lifting device can be controlled to drive the cutting knife to descend, and the designated local area of the plastic packaging bag is cut, and finally the cut local area of the plastic packaging bag is placed between the fixed limiting component and the stretching component for stretching detection, and then the tensile properties of the local area of the plastic packaging bag are comprehensively analyzed to improve the accuracy of the overall tensile performance test results of the plastic packaging bag, which is suitable for popularization and use.

It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims (8)

1. A stretching detection device for a plastic packaging bag, comprising a workbench (1), characterized in that: a bidirectional ball screw (2) is arranged horizontally above the workbench (1), first rotating bearing seats (3) are arranged at both ends of the bidirectional ball screw (2), a second rotating bearing seat (4) is arranged in the middle of the bidirectional ball screw (2), the first rotating bearing seat (3) and the second rotating bearing seat (4) are both fixedly connected to the top of the workbench (1), a rotating motor (5) is arranged outside the first rotating bearing seat (3) at one end of the bidirectional ball screw (2), the output end of the rotating motor (5) is connected to one end of the bidirectional ball screw (2), stretching components (6) are symmetrically arranged on the bidirectional ball screw (2) on both sides of the second rotating bearing seat (4), a fixed limit component (7) is arranged on the top of the workbench (1) corresponding to the position of the first rotating bearing seat (3), and a control device (8) is arranged on the outer surface of one longitudinal side of the workbench (1). 2. A plastic packaging bag stretching detection device according to claim 1, characterized in that: the stretching component (6) comprises a U-shaped movable support frame (601) and a ball nut (602) installed on a bidirectional ball screw (2), the two ends of the bottom of the U-shaped movable support frame (601) are respectively connected to the two ends of the top longitudinal direction of the workbench (1) in a slidable manner in the transverse direction, the ball nut (602) is connected to the inner surface of the bottom of the U-shaped movable support frame (601), and the U-shaped movable support frame (601) is laterally away from the fixed limit A limiting pressure plate (603) is provided on one side of the positioning assembly (7), and a movable support plate (604) is provided on the other side. The limiting pressure plate (603) is provided with a plurality of plug-in support connecting rods (605) equidistantly arranged along the longitudinal direction. The plug-in support connecting rods (605) are plug-in connected to the U-shaped movable support frame (601). One end of the plug-in support connecting rod (605) passes through the U-shaped movable support frame (601) and is connected to the movable support plate (604). A first lifting and lowering plate (604) is provided above the movable support plate (604). 6), first guide plug-in rods (607) are provided at both ends of the bottom of the first lifting and compressing plate (606), and the first guide plug-in rods (607) are plug-connected with the movable support plate (604), and a first lifting device (608) is provided at the bottom of the movable support plate (604) and inside the first guide plug-in rod (607), and the top output end of the first lifting device (608) passes through the movable support plate (604) and is connected to the bottom of the first lifting and compressing plate (606), and the top of the movable support plate (604) A first arc-shaped limiting groove (609) is provided at the bottom of the first lifting and pressing plate (606) at a position corresponding to the first arc-shaped limiting groove (609), buffers (611) are provided at both longitudinal ends of the U-shaped movable support frame (601) corresponding to the positions of the movable support plate (604), and a pressure sensor (612) is provided on the surface of the U-shaped movable support frame (601) on the side close to the limiting pressing plate (603) and located between the plug-in support connecting rods (605). 3. A plastic packaging bag stretching detection device according to claim 2, characterized in that: the fixed limiting component (7) comprises a U-shaped fixed support seat (701), the U-shaped fixed support seat (701) is arranged on the top of the workbench (1) corresponding to the middle position of the bidirectional ball screw (2), a fixed support plate (702) is arranged in the middle of the top of the U-shaped fixed support seat (701), a supporting top plate (703) is arranged on the top of the fixed support plate (702), the top of the supporting top plate (703) is located on both sides of the horizontal direction of the fixed support plate (702) and a second lifting device (704) is arranged, the output end of the second lifting device (704) extends into the bottom of the supporting top plate (703) and a second lifting and compressing plate (705) is installed, the top of the second lifting and compressing plate (705) is located on both sides of the longitudinal direction of the second lifting device (704) and a second guide plug rod (706) is arranged, and the second guide plug rod (706) is plug-connected with the supporting top plate (703). The second lifting and compressing plate (705) is provided with a second arc-shaped limiting protrusion (707) at the bottom, and the top of the U-shaped fixed support seat (701) is provided with a second arc-shaped limiting groove (708) at a position corresponding to the second arc-shaped limiting protrusion (707). The support top plate (703) is provided with a U-shaped support mounting frame (709) between the second lifting device (704). The top of the U-shaped support mounting frame (709) is connected to a movable support mounting plate (710) in a longitudinal sliding manner. A driving motor (711) is arranged at the top of the movable support mounting plate (710), and a walking wheel (712) is installed at the bottom output end of the driving motor (711) through the movable support mounting plate (710), and the circumferential outer surface of the walking wheel (712) is in contact with a lateral side surface of the U-shaped support mounting frame (709), and CCD cameras (713) are arranged at both ends of the bottom of the movable support mounting plate (710), and a highly transparent protective cover is arranged on the outer side of the CCD camera (713). 4. A plastic packaging bag stretching detection device according to claim 3, characterized in that: an auxiliary workbench (9) is arranged on the outer surface of one longitudinal side of the workbench (1) away from one end of the control device (8), a fixed limit seat (10) is arranged on the top of the auxiliary workbench (9), a cutting component (11) is arranged on the top of the auxiliary workbench (9) on the side of the fixed limit seat (10) away from the workbench (1) in the longitudinal direction, the cutting component (11) and the auxiliary workbench (9) are slidably connected in the longitudinal direction, a moving mechanism (12) is arranged between the lateral side of the cutting component (11) and the auxiliary workbench (9), a third lifting device (13) is recessed at both lateral ends of the fixed limit seat (10), and a third lifting and pressing plate (14) is arranged between the tops of the third lifting device (13). 5. A plastic packaging bag stretching detection device according to claim 4, characterized in that: the cutting component (11) comprises a U-shaped movable support seat (1101), the U-shaped movable support seat (1101) is connected to the top of the auxiliary workbench (9) in a longitudinal sliding manner, the moving mechanism (12) is arranged between one lateral side of the U-shaped movable support seat (1101) and the auxiliary workbench (9), a U-shaped fixed mounting plate (1102) is arranged on the top of the U-shaped movable support seat (1101), and the U-shaped fixed mounting plate (1102) is arranged on the top of the U-shaped movable support seat (1101). 02) is provided with a fourth lifting device (1103) at the top, the bottom output end of the fourth lifting device (1103) extends into the U-shaped fixed mounting plate (1102), the inner side of which is provided with a lifting support mounting plate (1104), the bottom of which is provided with a cutting knife (1105), the top of the lifting support mounting plate (1104) is located on both sides of the fourth lifting device (1103), and the third guide plug-in rod (1106) is connected to the U-shaped fixed mounting plate The mounting plate (1102) is plug-connected, a positioning frame (1107) is slidably connected between the inner surfaces of the two lateral sides of the U-shaped fixed mounting plate (1102) along the vertical direction, a cutting groove (1108) is arranged at the top of the U-shaped movable support seat (1101) corresponding to the position of the cutting knife (1105), and a fifth lifting device (1109) is recessed and arranged on both lateral sides of the cutting groove (1108) at the top of the U-shaped movable support seat (1101), and the top output end of the fifth lifting device (1109) is connected to the positioning frame (1107). ) is connected to the bottom of the U-shaped movable support seat (1101), a fixed clamp (1110) is arranged on the side away from the workbench (1), and support screws (1111) are inserted and installed at both ends of the fixed clamp (1110), one end of the support screw (1111) is connected to the U-shaped movable support seat (1101), and the other end is threadedly installed with a limit nut (1112), and the support screw (1111) is located between the limit nut (1112) and the fixed clamp (1110) and a spring (1113) is arranged. 6. A plastic packaging bag stretching detection device according to claim 5, characterized in that linear bushings are arranged between the plug-in support connecting rod (605) and the U-shaped movable support frame (601), between the first guide plug-in rod (607) and the movable support plate (604), between the second guide plug-in rod (706) and the support top plate (703), and between the third guide plug-in rod (1106) and the U-shaped fixed mounting plate (1102). 7. A plastic packaging bag stretching detection device according to claim 5, characterized in that: a displacement sensor (15) is provided on the bottom inner surface of the U-shaped movable support frame (601) located on the longitudinal side of the ball nut (602) and the bottom inner surface of the U-shaped movable support seat (1101). 8. A plastic packaging bag stretching detection device according to claim 7, characterized in that: the rotating motor (5), the third lifting device (13), the displacement sensor (15), the first lifting device (608), the pressure sensor (612), the second lifting device (704), the driving motor (711), the CCD camera (713), the fourth lifting device (1103) and the fifth lifting device (1109) are all electrically connected to the control device (8).