Pulling experimental instrument for detecting toughness of preservative film

Abstract

The utility model relates to the technical field of preservative film detection equipment, and particularly discloses a pulling experiment instrument for preservative film toughness detection, which comprises a pulling mechanism, the pulling mechanism comprises a bearing plate, a tension meter and a first telescopic rod, the tension meter is arranged above the bearing plate, and the first telescopic rod is arranged on one side of the tension meter. A pulling mechanism is arranged on the base, a limiting and fixing mechanism is arranged above the pulling mechanism, a shooting mechanism is arranged above the limiting and fixing mechanism, the limiting and fixing mechanism comprises two supporting plates and a pressing plate, and the shooting mechanism comprises two bottom plates and a second telescopic rod. Damage to the preservative film due to manual unfolding is avoided, the preservative film toughness detection efficiency is improved while loss of the preservative film is reduced, the mechanism for adjusting the position of the camera is simple, the height of the camera can be adjusted according to actual requirements, and the camera is prevented from affecting placement of the preservative film.

Description

Technical Field

[0001] The utility model relates to the technical field of cling film testing equipment, and particularly discloses a pulling test instrument for cling film toughness testing. Background Art

[0002] Cling film is a plastic packaging product, typically made through polymerization using ethylene as a masterbatch. It is primarily used for food packaging and preservation. Cling film can be categorized by its material: polyethylene (PE), polyvinyl chloride (PVC), and polyvinylidene chloride (PVDC). During the production process, the film's toughness is tested to ensure the public can select films with appropriate toughness for different applications. This testing also facilitates material improvements.

[0003] The Chinese patent with patent number CN214277709U discloses a pulling test device for testing the toughness of plastic wrap, including a platform, a motor, a chain mechanism, an irradiation head and an electric push rod. A sliding groove is provided above the platform, and a right pillar is fixed above the right side of the platform. A left pillar is placed inside the sliding groove, and threaded rods are borne inside the left and right pillars. A pressure block is threadedly connected through the middle of the threaded rod, and bumps are fixed below the pressure block, above the right pillar and above the left pillar. A tensile testing machine is installed below the right side of the left pillar, and the right side of the tensile testing machine is elastically connected to the platform. A support rod is installed above the right side of the platform. The pulling test device for testing the toughness of plastic wrap is equipped with a threaded rod and a protrusion. The movement of the threaded rod drives the protrusion to move synchronously. The protrusion makes the contact surface of the film uneven, avoiding the phenomenon that the film is pulled when pulling, so that the data of the tensile testing machine is inconsistent with the actual situation and there is a certain error. However, in the process of fixing the plastic wrap by the above-mentioned experimental device, the plastic wrap is prone to wrinkles and sticking together, and the user needs to manually unfold it. During the unfolding process, the plastic wrap is easily damaged, thereby causing waste of the plastic wrap raw material. The mechanism for adjusting the position of the irradiation head in the above-mentioned experimental device is complicated, which is not conducive to installation and maintenance, and the height adjustment of the irradiation head is inconvenient, which is easy to affect the user's operation of placing the plastic wrap, which is relatively inconvenient. Therefore, in order to solve the above-mentioned problems, the utility model proposes a pulling test instrument for testing the toughness of plastic wrap. Utility Model Content

[0004] The utility model aims to provide a pulling test instrument for testing the toughness of plastic wrap, which can prevent the plastic wrap from wrinkling and sticking together during the placement and fixing process, avoid damage to the plastic wrap due to manual unfolding, reduce the loss of plastic wrap and improve the efficiency of plastic wrap toughness testing. The mechanism for adjusting the camera position is simple and easy to install and maintain. The height of the camera can be adjusted according to actual needs to prevent the camera from affecting the placement of the plastic wrap.

[0005] The utility model is realized through the following technical solutions:

[0006] A pulling test instrument for testing the toughness of cling film, comprising a pulling mechanism, the pulling mechanism comprising a carrying plate, a tensile gauge and a first telescopic rod, the tensile gauge is arranged above the carrying plate, the first telescopic rod is arranged on one side of the tensile gauge, a limiting fixing mechanism is arranged above the pulling mechanism, a shooting mechanism is arranged above the limiting fixing mechanism, the limiting fixing mechanism comprises two supporting plates and a pressure plate, a pressure plate is arranged above the two supporting plates, side rods are arranged on both sides of the support plates, a first support rod is connected between the two side rods, the shooting mechanism comprises two bottom plates and a second telescopic rod, a second telescopic rod is connected above the two bottom plates, the telescopic ends of the two second telescopic rods are connected to a support frame, a second slide is arranged on both sides of the support frame, a slider is slidably connected to the inside of the second slide, and a plurality of cameras are arranged between the two sliders.

[0007] As a further arrangement of the above scheme, two first slide grooves are provided above the supporting plate, which can limit the moving direction of the first mounting bracket and its connecting parts. Multiple first anti-slip pads are connected to both sides of the bottom of the supporting plate, which can keep the pulling mechanism stable on the desktop. The outer side of the first telescopic rod is connected to the supporting plate through a support seat, which can provide stable support for the first telescopic rod. The telescopic end of the first telescopic rod is connected to the first mounting bracket, and the bottom of the dynamometer is connected to the first mounting bracket, which facilitates the installation and maintenance of the dynamometer, so that the position of the dynamometer can be adjusted by the extension and retraction of the first telescopic rod to pull the plastic wrap.

[0008] As a further setting of the above scheme, two first protrusions are symmetrically arranged at the bottom of the first mounting bracket, and the first protrusions are slidably connected to the first slide groove, which can provide stable support for the first mounting bracket and its connecting parts, limit the moving direction of the first mounting bracket and the tensile gauge, and ensure that the tensile gauge accurately measures the toughness of the cling film. A plurality of first limiting holes are evenly spaced on both sides above the first mounting bracket, which is convenient for adjusting the spacing between the two support plates and the parts above them in the limiting and fixing mechanism according to different measurement requirements to obtain multiple sets of measurement data and improve the reliability of the measurement data. The tensile gauge is connected to the second mounting bracket at one end away from the first mounting bracket, and two first limiting holes are symmetrically arranged on both sides above the second mounting bracket to facilitate the placement of the limiting and fixing mechanism. The bottom of the second mounting bracket is connected to the supporting plate to facilitate the installation and maintenance of the second mounting bracket.

[0009] As a further arrangement of the above scheme, two first pins are provided at both ends of the lower end of the support plate, and the first pins pass through the interior of the first limiting hole and are plugged into the first limiting hole, which is convenient for disassembling and assembling the limiting fixing mechanism, and two second pins are provided at both ends of the support plate, and the spacing between the centers of the cross-sectional circles of the two second pins is equal to the spacing between the centers of the cross-sectional circles of the two first pins, which is convenient for determining the spacing between the two support plates and the components above them, thereby determining the measured length of the cling-preservative film, and a plurality of second limiting holes are equally spaced inside the side rods, and the spacing between the centers of two adjacent second limiting holes is equal to the spacing between the centers of two adjacent first limiting holes, and the second pins pass through the interior of the second limiting hole and are plugged into the second limiting hole, which is convenient for using the two side rods to keep the two support plates fixed at a certain spacing, so that the limiting fixing mechanism forms a whole, which is convenient for separating the limiting fixing mechanism from the pulling mechanism to fix the cling-preservative film, and then connecting the limiting fixing mechanism to the pulling mechanism after the fixation is completed.

[0010] As a further setting of the above scheme, two threaded columns are provided on both sides of the upper part of the support plate, and the outer side of the threaded columns is threadedly connected with a double-ear nut. A second protrusion is provided in the upper middle part of the support plate, and reserved holes are provided on both sides of the pressure plate. The threaded column passes through the interior of the reserved hole. An arc-shaped pressing groove is provided on the side of the pressure plate close to the support plate, and the arc-shaped pressing groove is crimped with the second protrusion. After the cling film is placed on the two second protrusions, the two pressing plates can be used to press the cling film, and the arc-shaped pressing groove can be tightly fitted with the second protrusion by tightening the double-ear nut to fix the cling film.

[0011] As a further configuration of the above scheme, a third pin is provided at both ends of the first support rod, and the third pin passes through the interior of the second limiting hole and is plugged into the second limiting hole. A knife hole is provided inside the first support rod, and a cutter is provided on the inner side of the knife hole. A handle is connected above the cutter, and the handle is slidably connected to the first support rod, so that the cutter can be used to cut the plastic wrap to keep the incision neat.

[0012] As a further arrangement of the above scheme, second anti-slip pads are provided at both ends of the lower sides of the two base plates, which can keep the shooting mechanism stable on the desktop; one end of the two base plates is connected to a baffle, which is in contact with the supporting plate, and can limit the position of the pulling mechanism, making it convenient for the pulling mechanism to be aligned with the shooting mechanism; a storage box is provided above one of the base plates, which is convenient for placing accessories such as double-ear nuts, cutters and first anti-slip pads in the instrument; a screw rod is provided through the interior of one of the sliders, and one end of the screw rod is connected to a motor, which can provide power for the movement of the slider; a second support rod is connected between the two sliders, which can provide stable support for the camera; multiple cameras are detachably connected to the second support rod, which is convenient for the installation and maintenance of the camera.

[0013] As a further configuration of the above solution, a controller is provided on one side of the photographing mechanism to facilitate the control of the operation of relevant equipment in the instrument.

[0014] The utility model has the following beneficial effects during use:

[0015] The design of multiple first limiting holes above the first mounting bracket and the second mounting bracket in the pulling mechanism can provide support for the limiting fixing mechanism while being suitable for fixing the two support plates and their connecting parts after the distance between them is adjusted, so that users can use the instrument to measure the toughness of cling film of different areas and lengths, obtain multiple sets of data, and improve the accuracy of the measurement of the toughness of the cling film.

[0016] The limiting and fixing mechanism can be removed from the pulling mechanism before fixing the plastic wrap, reducing the influence of the pulling mechanism and shooting mechanism on the fixing of the plastic wrap, adjusting the second limiting hole into which the second pin is inserted, thereby adjusting the distance between the two support plates and the components above them, and then adjusting the length and area of ​​the detected plastic wrap. After the plastic wrap is pulled and placed on the support plate, it is pressed tightly with a pressing plate, and the plastic wrap is cut with a cutter, which can avoid the situation where the plastic wrap folds stick together, and avoid damage to the plastic wrap due to manual unfolding. When the instrument is idle, the limiting and fixing mechanism can be used as a daily plastic wrap cutting mechanism, thereby improving the utilization rate of the limiting and fixing mechanism.

[0017] The combination of the screw and motor in the shooting mechanism can simplify the camera position adjustment method and facilitate the installation and maintenance of the shooting mechanism. The use of two second telescopic rods makes it easy to adjust the height of components such as the support frame, camera and screw, avoiding the above components affecting the placement of the limit fixing mechanism and plastic wrap. The use of the storage box makes it easy to place accessories such as the double-ear nut, cutter and first anti-slip pad in the instrument, making it convenient for users to access and replace the above accessories. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a perspective schematic diagram of the present utility model;

[0020] Figure 2 It is a perspective schematic diagram of the pulling mechanism in the present utility model;

[0021] Figure 3 It is a perspective schematic diagram of the first mounting bracket in the present utility model;

[0022] Figure 4 It is a perspective schematic diagram of the position limiting and fixing mechanism in the present utility model;

[0023] Figure 5 It is a perspective schematic diagram of the medium pressure plate of the utility model;

[0024] Figure 6 This is a perspective diagram of the combination of the first support rod and the cutter in the present invention;

[0025] Figure 7 It is a perspective schematic diagram of the shooting mechanism in the present utility model;

[0026] Figure 8 This is a perspective schematic diagram of the combination of the slider, screw rod, motor and second support rod in the utility model.

[0027] In the figure: 1, pulling mechanism; 2, limiting and fixing mechanism; 3, shooting mechanism; 4, controller; 11, carrying plate; 111, first slide groove; 112, first anti-slip pad; 12, first mounting bracket; 121, first limiting hole; 122, first protrusion; 13, second mounting bracket; 14, dynamometer; 15, first telescopic rod; 151, support base; 21, support plate; 211, first pin rod; 212, second pin rod; 213, threaded column; 214, double-ear nut; 215, second protrusion Block; 22, pressing plate; 221, reserved hole; 222, arc-shaped pressing groove; 23, side rod; 231, second limiting hole; 24, first support rod; 241, knife hole; 242, third pin; 25, cutter; 251, handle; 31, bottom plate; 311, second anti-slip pad; 312, baffle; 32, storage box; 33, second telescopic rod; 34, support frame; 341, second slide groove; 35, slider; 36, screw rod; 37, motor; 38, second support rod; 39, camera. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings 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 in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Figures 1 to 8 , and describes the application in detail with reference to embodiments.

[0030] The embodiment discloses a pulling test instrument for testing the toughness of a cling film, comprising a pulling mechanism 1, the pulling mechanism 1 comprising a supporting plate 11, a tensile gauge 14 and a first telescopic rod 15, the tensile gauge 14 being provided above the supporting plate 11, the first telescopic rod 15 being provided on one side of the tensile gauge 14, a limiting fixing mechanism 2 being provided above the limiting fixing mechanism 2, a photographing mechanism 3 being provided above the limiting fixing mechanism 2, the limiting fixing mechanism 2 comprising two supporting plates 21 and a pressing plate 22, both of which are provided above the supporting plates 21 There is a pressure plate 22, and side rods 23 are provided on both sides of the support plate 21. A first support rod 24 is connected between the two side rods 23. The shooting mechanism 3 includes two base plates 31 and a second telescopic rod 33. The top of the two base plates 31 is connected to the second telescopic rod 33, and the telescopic ends of the two second telescopic rods 33 are connected to a support frame 34. Second slide grooves 341 are provided on both sides of the support frame 34, and a slider 35 is slidably connected inside the second slide groove 341. A plurality of cameras 39 are provided between the two sliders 35.

[0031] like Figure 1 and Figure 2 As shown, two first slide grooves 111 are provided above the supporting plate 11, which can limit the moving direction of the first mounting frame 12 and its connecting parts. A plurality of first anti-slip pads 112 are connected to both sides of the bottom of the supporting plate 11, which can keep the pulling mechanism 1 stable on the desktop. The outer side of the first telescopic rod 15 is connected to the supporting plate 11 through a support seat 151, which can provide stable support for the first telescopic rod 15. The telescopic end of the first telescopic rod 15 is connected to the first mounting frame 12, and the bottom of the dynamometer 14 is connected to the first mounting frame 12, which facilitates the installation and maintenance of the dynamometer 14, so that the position of the dynamometer 14 can be adjusted by the extension and retraction of the first telescopic rod 15 to pull the plastic wrap.

[0032] like Figure 1 、 Figure 2 and Figure 3As shown, two first protrusions 122 are symmetrically provided at the bottom of the first mounting bracket 12, and the first protrusions 122 are slidably connected to the first slide groove 111, which can provide stable support for the first mounting bracket 12 and its connecting parts, limit the movement direction of the first mounting bracket 12 and the dynamometer 14, and ensure that the dynamometer 14 accurately measures the toughness of the cling film. A plurality of first limiting holes 121 are evenly spaced on both sides above the first mounting bracket 12, so as to facilitate adjustment of the spacing between the two support plates 21 and the parts above them in the limiting and fixing mechanism 2 according to different measurement requirements, so as to obtain multiple sets of measurement data and improve the reliability of the measurement data. The end of the dynamometer 14 away from the first mounting bracket 12 is connected to the second mounting bracket 13, and two first limiting holes 121 are symmetrically provided on both sides above the second mounting bracket 13, which is convenient for placing the limiting and fixing mechanism 2. The bottom of the second mounting bracket 13 is connected to the supporting plate 11, which is convenient for the installation and maintenance of the second mounting bracket 13.

[0033] like Figure 1 and Figure 4 As shown, two first pins 211 are provided at both ends of the lower side of the support plate 21. The first pins 211 pass through the interior of the first limiting hole 121 and are plugged into the first limiting hole 121, which is convenient for disassembling and assembling the limiting fixing mechanism 2. Two second pins 212 are provided at both ends of the support plate 21. The distance between the centers of the cross-sectional circles of the two second pins 212 is equal to the distance between the centers of the cross-sectional circles of the two first pins 211, which is convenient for determining the distance between the two support plates 21 and the components above them, thereby determining the length of the measured cling film. A plurality of second limiting holes 231 are arranged at equal intervals inside 23, and the distance between the centers of two adjacent second limiting holes 231 is equal to the distance between the centers of two adjacent first limiting holes 121. The second pin rod 212 passes through the interior of the second limiting hole 231 and is plugged into the second limiting hole 231, so that the two side rods 23 can be used to keep the two support plates 21 fixed at a certain distance, so that the limiting and fixing mechanism 2 forms a whole, which is convenient for separating the limiting and fixing mechanism 2 from the pulling mechanism 1 to fix the plastic wrap, and then connecting the limiting and fixing mechanism 2 to the pulling mechanism 1 after the fixation is completed.

[0034] like Figure 1 、 Figure 4 and Figure 5As shown, two threaded columns 213 are provided on both sides of the upper part of the support plate 21, and the outer side of the threaded column 213 is threadedly connected with a double-ear nut 214. A second protrusion 215 is provided on the upper middle part of the support plate 21, and reserved holes 221 are provided on both sides of the pressure plate 22. The threaded column 213 passes through the interior of the reserved hole 221. An arc-shaped pressing groove 222 is provided on the side of the pressure plate 22 close to the support plate 21, and the arc-shaped pressing groove 222 is crimped with the second protrusion 215. After the cling film is placed on the two second protrusions 215, the two pressing plates 22 can be used to press the cling film, and the arc-shaped pressing groove 222 can be tightly fitted with the second protrusion 215 by tightening the double-ear nut 214 to fix the cling film.

[0035] like Figure 1 、 Figure 4 and Figure 6 As shown, both ends of the first support rod 24 are provided with a third pin rod 242, and the third pin rod 242 passes through the interior of the second limiting hole 231 and is plugged into the second limiting hole 231. A knife hole 241 is provided inside the first support rod 24, and a cutter 25 is provided on the inner side of the knife hole 241. A handle 251 is connected above the cutter 25, and the handle 251 is slidably connected to the first support rod 24. The cutter 25 can be used to cut the plastic wrap to keep the incision neat.

[0036] like Figure 1 、 Figure 7 and Figure 8 As shown, second anti-slip pads 311 are provided at both ends of the lower part of the two base plates 31, which can keep the shooting mechanism 3 stable on the desktop, and a baffle 312 is connected to one end of the two base plates 31, which is in contact with the supporting plate 11, and can limit the position of the pulling mechanism 1, so as to facilitate the alignment of the pulling mechanism 1 and the shooting mechanism 3. A storage box 32 is provided above one of the base plates 31, which is convenient for placing accessories such as the double-ear nut 214, the cutter 25 and the first anti-slip pad 112 in the instrument. A screw rod 36 is provided inside one of the sliders 35, and one end of the screw rod 36 is connected to a motor 37, which can provide power for the movement of the slider 35. A second support rod 38 is connected between the two sliders 35, which can provide stable support for the camera 39. Multiple cameras 39 are detachably connected to the second support rod 38, which is convenient for the installation and maintenance of the camera 39.

[0037] like Figure 1 and Figure 6 As shown, a controller 4 is provided on one side of the shooting mechanism 3 to facilitate the control of the operation of related equipment in the instrument.

[0038] The present embodiment discloses a pulling test instrument for testing the toughness of cling film. Before use, measure the distance between two adjacent first limiting holes 121 or second limiting holes 231, remove the limiting fixing mechanism 2 from the pulling mechanism 1 and place it aside, remove the multiple double-ear nuts 214 from the threaded column 213 in sequence, and after the threaded column 213 is pulled out from the reserved hole 221, remove the pressing plate 22 from the support plate 21, remove the side rod 23 on one side of the support plate 21, and pull the second pin 212 out of the second limiting hole 231. According to the design In the experiment of detecting the cling film, replace the two second pins 212 at one end of a support plate 21 and insert them into the second limiting hole 231 to adjust the distance between the two support plates 21. After the adjustment is completed, insert the third pin 242 at one end of the first support rod 24 into the second limiting hole 231 close to the side of the support plate 21, and then restore the connection between the removed side rod 23 and the second pin 212 to fix the position of the support plate 21 and the first support rod 24. At this time, the first pin 211 under the support plate 21 provides support for the limiting and fixing mechanism 2.

[0039] Place the cling film to be tested on one side of the first support rod 24, pull one end of the cling film to the support plate 21 away from one end of the first support rod 24, so that the bottom of the cling film is attached to the second protrusion 215, put the pressing plate 22 back on the support plate 21, pass the threaded column 213 through the reserved hole 221, put the double-ear nut 214 on the threaded column 213 and tighten it, so that the arc-shaped pressing groove 222 and the second protrusion 215 squeeze the cling film to fix the cling film on the support plate 21 away from the first support rod 24, and fix the other pressing plate 22 on the support plate 21 close to the first support rod 24 in the same way. Tighten it, then buckle the handle 251, move the cutter 25 from one end of the knife hole 241 to the other end, cut the plastic wrap, and then place the limiting and fixing mechanism 2 together with the plastic wrap instrument on top of the pulling mechanism 1, so that the two first pins 211 on both sides of the bottom of one support plate 21 pass through the two first limiting holes 121 on both sides above the second mounting frame 13 respectively, and the first pin 211 under the other support plate 21 passes through the appropriate first limiting holes 121 on the first mounting frame 12, and remove the two side rods 23 from both sides of the support plate 21 in turn to release the limit on the two support plates 21 and the parts above them.

[0040] Use the controller 4 to simultaneously control the extension and retraction of the two second telescopic rods 33. When the support frame 34 and the camera 39 are adjusted to the appropriate position, close the second telescopic rod 33, fix the camera 39 vertically to the plastic wrap, use the controller 4 to start the motor 37, so that the motor 37 drives the screw rod 36 to rotate, adjust the slider 35 and the camera 39 to one end of the plastic wrap, use the controller 4 to start the camera 39 and adjust the focal length of the camera 39 so that the camera 39 can clearly capture the plastic wrap, and use the controller 4 to start the dynamometer 14, the first telescopic rod 15 and the motor 37 in sequence to slowly retract the first telescopic rod 15. The first mounting frame 12 and the support plate 21 above it are driven to move, and the detection head of the tensile gauge 14 is pulled to gradually move the first mounting frame 12 away from the second mounting frame 13. During this process, the camera 39 moves at a constant speed toward the other end of the plastic wrap, records the changes of the plastic wrap in real time, and transmits the picture back to the controller 4. The tensile gauge 14 transmits the tensile force data received back to the controller 4 in real time, so that the user can compare the tensile force data with the real-time situation of the plastic wrap on the controller 4, and intuitively judge the toughness of the plastic wrap according to the changes in the tensile force data until the plastic wrap breaks, providing convenience for subsequent users to dynamically analyze the detection data.

[0041] Repeat the above operation and replace the first limiting hole 121 and the second limiting hole 231 in which the first pin 211 and the second pin 212 are inserted, so as to adjust the distance between the two support plates 21 in the limiting fixing mechanism 2 and the connecting parts above them, thereby adjusting the length and area of ​​the cling film used for detection, so that the user can obtain multiple sets of data and improve the reliability of the cling film toughness detection data.

[0042] The controller 4, the slide groove 341111, the first anti-slip pad 112, the first limiting hole 121, the tensile gauge 14, the first telescopic rod 15, the support seat 151, the first pin rod 211, the second pin rod 212, the threaded column 213, the double-ear nut 214, the second pin rod 212, the second limiting hole 231, the first support rod 24, the knife hole 241, the third pin rod 242, the cutter 25, the bottom plate 31, the second anti-slip pad 311, the storage box 32, the second telescopic rod 33, the slide groove 341111, the slider 35, the screw rod 36, the motor 37, the camera 39 and other components in the pulling test instrument for detecting the toughness of plastic wrap disclosed by the utility model are all universal standard parts or parts known to those skilled in the art. The structure and principle of the pulling test instrument can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pulling test instrument for testing the toughness of plastic wrap, comprising a pulling mechanism, the pulling mechanism comprising a supporting plate, a tensile gauge, and a first telescopic rod, wherein the tensile gauge is provided above the supporting plate, and the first telescopic rod is provided on one side of the tensile gauge, characterized in that: A limiting fixing mechanism is provided above the pulling mechanism, and a shooting mechanism is provided above the limiting fixing mechanism, and the limiting fixing mechanism includes two support plates and a pressure plate, a pressure plate is provided above the two support plates, side rods are provided on both sides of the support plates, and a first support rod is connected between the two side rods, and the shooting mechanism includes two bottom plates and a second telescopic rod, a second telescopic rod is connected above the two bottom plates, and the telescopic ends of the two second telescopic rods are connected to a support frame, and second slide grooves are provided on both sides of the support frame, and a slider is slidably connected inside the second slide groove, and a plurality of cameras are provided between the two sliders.

2. A pulling test instrument for testing the toughness of cling film according to claim 1, characterized in that: Two first slide grooves are provided above the supporting plate, and multiple first anti-slip pads are connected to both sides of the bottom of the supporting plate. The outer side of the first telescopic rod is connected to the supporting plate through a support seat, and the telescopic end of the first telescopic rod is connected to the first mounting bracket, and the bottom of the dynamometer is connected to the first mounting bracket.

3. A pulling test instrument for testing the toughness of cling film according to claim 2, characterized in that: Two first protrusions are symmetrically arranged at the bottom of the first mounting bracket, and the first protrusions are slidably connected to the first slide groove. A plurality of first limiting holes are evenly spaced on both sides above the first mounting bracket. The end of the dynamometer away from the first mounting bracket is connected to the second mounting bracket, and two first limiting holes are symmetrically arranged on both sides above the second mounting bracket. The bottom of the second mounting bracket is connected to the supporting plate.

4. A pulling test instrument for testing the toughness of cling film according to claim 1, characterized in that: Two first pins are provided at both ends of the lower side of the support plate, and the first pins pass through the interior of the first limiting hole and are plugged into the first limiting hole. Two second pins are provided at both ends of the support plate, and the spacing between the centers of the two second pin cross-sectional circles is equal to the spacing between the centers of the two first pin cross-sectional circles. A plurality of second limiting holes are provided at equal intervals inside the side rod, and the spacing between the centers of two adjacent second limiting holes is equal to the spacing between the centers of two adjacent first limiting holes. The second pins pass through the interior of the second limiting hole and are plugged into the second limiting hole.

5. A pulling test instrument for testing the toughness of cling film according to claim 1, characterized in that: Two threaded columns are provided on both sides of the upper part of the support plate, and the outer sides of the threaded columns are threadedly connected with double-ear nuts. A second protrusion is provided in the middle part of the upper part of the support plate, and reserved holes are provided on both sides of the pressure plate. The threaded columns pass through the inside of the reserved holes. An arc-shaped pressing groove is provided on the side of the pressure plate close to the support plate, and the arc-shaped pressing groove is press-connected with the second protrusion.

6. A pulling test instrument for testing the toughness of cling film according to claim 1, characterized in that: A third pin is provided at both ends of the first support rod, and the third pin passes through the interior of the second limiting hole and is plugged into the second limiting hole. A knife hole is provided inside the first support rod, and a cutter is provided on the inner side of the knife hole. A handle is connected above the cutter, and the handle is slidably connected to the first support rod.

7. A pulling test instrument for testing the toughness of cling film according to claim 1, characterized in that: A second anti-slip pad is provided at both ends of the lower part of the two base plates, a baffle is connected to one end of the two base plates, and the baffle is in contact with the supporting plate. A storage box is provided above one of the base plates, and a screw rod is provided through the interior of one of the sliders, and one end of the screw rod is connected to a motor. A second support rod is connected between the two sliders, and multiple cameras are detachably connected to the second support rod.

8. A pulling test instrument for testing the toughness of cling film according to claim 1, characterized in that: A controller is provided on one side of the shooting mechanism.

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