Tensile test device for PE (polyethylene) protective film

Abstract

The invention discloses a tensile test device for a PE protective film, and relates to the technical field of protective film test.The tensile test device comprises a main machine table, a feeding mechanism is fixedly installed on the upper surface of the left end of the main machine table and used for feeding and discharging, and a detection mechanism is fixedly installed on the upper surface of the right end of the main machine table and used for conducting tensile detection on a sample. A recycling box is fixedly connected to the middle position of the upper surface of the main machine table, and a control box is fixedly installed on the right front portion of the lower surface of the main machine table. Firstly, a left air cylinder is controlled to be started to drive a left clamping plate to downwards extrude a PE protective film into an anti-falling groove I, at the moment, clamping of the left ends of a plurality of samples is effectively completed, and then a right air cylinder is controlled to be started to drive a right clamping plate to downwards extrude the samples into an anti-falling groove II; at the moment, clamping of the right ends of a plurality of samples is effectively completed, and the stability of the clamped samples can be effectively improved through cooperative use of the first anti-disengaging groove and the second anti-disengaging groove.

Description

Technical Field

[0001] The invention relates to the technical field related to protective film testing, and in particular to a stretching testing device for PE protective films. Background Art

[0002] PE protective film is a protective film with polyethylene (PE) plastic film as the base material. It is made of acrylic resin as an adhesive and various special additives. This protective film has excellent properties, such as preventing products from being contaminated, corroded, scratched, etc. during production, processing, transportation, storage and use. Tensile performance is an important performance indicator of PE protective film. PE protective film needs to withstand tensile loads in some applications, such as packaging and covering. Tensile testing can ensure that the protective film will not break or lose its protective effect due to excessive load during use, thereby ensuring safe use.

[0003] At present, most of the existing PE protective film tensile testing devices perform single tests on the same type of samples. This testing method requires one test at a time and requires continuous replacement of sample tubes, resulting in low testing efficiency and greatly reducing the user experience. After the existing PE protective film tensile testing device completes the first test of the sample, the staff is required to manually place the protective film on the sample tube into the clamping structure for a second test. Manual operation is time-consuming and labor-intensive, and is also prone to work-related injuries. Summary of the invention

[0004] In order to solve the defects in the prior art, the present invention provides a stretching test device for PE protective film.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The present invention discloses a tensile testing device for PE protective film, comprising a mainframe, a feeding mechanism is fixedly installed on the upper surface of the left end of the mainframe for feeding and unloading, a detection mechanism is fixedly installed on the upper surface of the right end of the mainframe for performing tensile testing on samples, a recovery box is fixedly connected to the middle of the upper surface of the mainframe, and a control box is fixedly installed on the right front of the lower surface of the mainframe;

[0007] The feeding mechanism includes a U-shaped bracket, the bottom of the U-shaped bracket is fixedly connected to the upper surface of the left end of the main machine platform, the middle positions of the front and back sides of the U-shaped bracket are embedded with lower screws through bearings, and the surface of the left end of the lower screw is provided with three groups of reverse threads, two of the U-shaped brackets are located on the top of the inner wall and fixedly connected with an upper fixed rod, the surfaces of the lower screw and the upper fixed rod are sleeved with three groups of two-way sliding blocks, and the number of each group of two-way sliding blocks is two, and every two two-way sliding blocks are respectively threadedly connected with the reverse threads, and the top of each group of the two-way sliding blocks is fixedly connected to two carriers, and the front and back sides of the two carriers are embedded with two inner chucks through bearings.

[0008] As a preferred technical solution of the present invention, a sample tube is sleeved on one end of the two inner chucks close to each other, two return plates are fixedly connected to the bottom of the opposite sides of the two carriers, a motor 1 is fixedly installed on the front side of the lower end of the U-shaped bracket, and the rear end of the motor 1 is fixedly connected to the front end of the lower screw through a coupling, and a material receiving trough is fixedly connected to the left side of the upper end of the U-shaped bracket.

[0009] As a preferred technical solution of the present invention, the detection mechanism includes a main frame plate, the lower end of the main frame plate is fixedly connected to the upper surface of the right end of the main platform, an upper screw is embedded in the middle position of the right side of the main frame plate through a bearing, two outer stabilizing columns are fixedly connected to the left sides of the front and rear ends of the main frame plate, a motor 2 is fixedly installed in the middle position of the right side of the main frame plate, and the left end of the motor 2 is fixedly connected to the right end of the upper screw, the surfaces of the two outer stabilizing columns and the left end of the upper screw are both sleeved with an upper slave plate, and the hole wall in the middle position of the upper slave plate is threadedly connected to the surface of the upper screw, and the two hole walls in the front and rear of the upper slave plate are slidably connected to the surfaces of the two outer stabilizing columns.

[0010] As a preferred technical solution of the present invention, three left mounting tubes are fixedly connected to the top of the upper slave plate, a left cylinder is fixedly installed at the middle position of the upper surface of each left mounting tube, a left clamping plate is fixedly installed at the lower end of each left cylinder, an anti-slip groove is provided on the bottom surface of the inner cavity of each left mounting tube, and an external tube is sleeved on the outside of the right end of each left mounting tube.

[0011] As a preferred technical solution of the present invention, a left solid block is fixedly connected to the middle position of the upper surface of the left end of each left installed tube, a right solid block is fixedly connected to the middle position of the upper surface of the left end of each external tube, a positioning spring is fixedly connected to the opposite sides of the left solid block and the right solid block, and a curved blade is fixedly connected to the curved surface of the right side surface of the lower end of the external tube.

[0012] As a preferred technical solution of the present invention, a stretching cylinder is fixedly installed at the middle position of the right side of the upper end of the main frame plate, and the left end of the stretching cylinder is fixedly connected to the upper loading plate.

[0013] As a preferred technical solution of the present invention, three tension sensors are fixedly installed on the left side of the upper loading plate.

[0014] As a preferred technical solution of the present invention, the left end of each tension sensor is fixedly connected to a right housing sleeve.

[0015] As a preferred technical solution of the present invention, a right cylinder is fixedly installed at the middle position of the upper surface of each right housing sleeve, and a right clamping plate is fixedly connected to the lower end of each right cylinder.

[0016] As a preferred technical solution of the present invention, a second anti-slip groove is provided on the lower surface of the inner cavity of the right housing.

[0017] The beneficial effects of the present invention are:

[0018] 1. The tensile testing device for PE protective film, through the feeding mechanism set up, firstly controls the motor to rotate forward to drive the lower screw to rotate forward, and the lower screw can drive the two bidirectional sliders in each group to move in opposite directions, and the two bidirectional sliders move in opposite directions to drive the two carriers and the two inner chucks to move in opposite directions at the same time. When the two inner chucks are fully inserted into the interior of the sample barrel, the installation of multiple sample barrels is quickly completed at this time, so that it is convenient for the staff to quickly complete the feeding of multiple samples, and effectively improves the detection efficiency of the device, and then controls the motor to reverse to drive the lower screw to reverse, and the reversal of the lower screw can drive the two inner chucks in each group to move in opposite directions. When the two inner chucks are fully separated from the inner cavity of the sample barrel, the disassembly of the sample barrel is quickly completed at this time, and finally the return plate can transfer the dropped sample barrel to the left to the interior of the receiving trough, so that the automatic discharging of the sample is completed, thereby effectively reducing the labor intensity of the staff and further improving the user experience.

[0019] 2. The tensile testing device for PE protective film, through the set left cylinder, right cylinder, tension sensor and stretching cylinder, firstly controls the left cylinder to start, which can drive the left clamping plate downward to squeeze the PE protective film into the anti-slip groove one, and then effectively completes the clamping of the left ends of multiple samples, and then controls the right cylinder to start, which can drive the right clamping plate downward to squeeze the samples into the anti-slip groove two, and then effectively completes the clamping of the right ends of multiple samples, and through the coordinated use of the anti-slip groove one and the anti-slip groove two, the stability of the samples after clamping can be effectively improved, and finally controls the stretching cylinder to start, which can drive the three tension sensors to move to the right, and the three tension sensors to move to the right can drive the three right containing sleeves and the right ends of the samples to move to the right at the same time, and when the three samples are broken, the tension sensor can detect the tension value in time, thereby quickly completing the synchronous detection of multiple samples, and the detection results of multiple samples can speed up the analysis of the samples by the detection personnel, so as to greatly improve the detection rate of the PE protective film.

[0020] 3. This kind of tensile testing device for PE protective film is provided with an external cylinder, a suitable spring, a curved blade and a second motor. First, the curved blade can cut the broken sample, and then the right cylinder is controlled to start to drive the right clamping plate to separate from the surface of the sample. At this time, the broken sample on the right side will automatically fall downward into the inside of the recycling box with its own gravity, thereby effectively completing the automatic collection of waste materials. Then, the motor second is controlled to rotate forward to drive the ends of the three samples to move to the right. When the external cylinder contacts the left end face of the right containing sleeve to the right, the left cylinder continues to move to the right, which will cause the external cylinder to shrink. At this time, the sample in the external cylinder The sample end will be automatically pushed into the right containing sleeve. At this time, controlling the right cylinder to start can drive the right clamping plate downward to clamp the sample again, so that the automatic feeding of the sample is completed quickly, which greatly reduces the labor intensity of the staff. Finally, controlling the left cylinder to start can drive the left clamping plate to separate from the sample, and then controlling the motor to reverse can drive the left loading barrel to move to the left to the initial position. At this time, controlling the left cylinder to start can drive the left clamping plate downward to clamp the sample again, so that the detection device can have the function of continuous detection, which greatly improves the detection efficiency of the sample and further improves the practicality of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a structural schematic diagram of a tensile testing device for PE protective film of the present invention;

[0023] Figure 2It is a front view of a tensile testing device for PE protective film of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a stretching test device for PE protective film from the right side perspective of the present invention;

[0025] Figure 4 It is a top view of a tensile testing device for PE protective film of the present invention;

[0026] Figure 5 It is a side cross-sectional view of a feeding mechanism of a tensile testing device for PE protective film of the present invention;

[0027] Figure 6 It is an exploded view of the structure of a feeding mechanism part of a tensile testing device for PE protective film of the present invention;

[0028] Figure 7 It is a front cross-sectional view of a tensile testing device for PE protective film of the present invention;

[0029] Figure 8 The present invention is a tensile testing device for PE protective film Figure 7 Stereoscopic image of

[0030] Fig. 9 The present invention is a tensile testing device for PE protective film Figure 8 Structural diagram from the right side perspective;

[0031] Fig.10 The present invention is a tensile testing device for PE protective film Figure 5 The enlarged view of point A in the middle;

[0032] Fig.11 The present invention is a tensile testing device for PE protective film Figure 6 The enlarged view of point B in the middle;

[0033] Fig.12 The present invention is a tensile testing device for PE protective film Figure 7 Enlarged view of point C in the middle;

[0034] Fig.13 The present invention is a tensile testing device for PE protective film Figure 7 The enlarged view of point D in the middle;

[0035] Fig.14 The present invention is a tensile testing device for PE protective film Figure 8 Enlarged view of point E in the middle.

[0036] In the figure: 1. Mainframe; 2. Feeding mechanism; 201. U-shaped bracket; 202. Lower screw rod; 203. Upper fixing rod; 204. Bidirectional slider; 205. Carrier; 206. Inner chuck; 207. Sample cylinder; 208. Return plate; 209. Motor 1; 210. Material receiving trough; 3. Detection mechanism; 301. Main frame plate; 302. Upper screw rod; 303. External stabilizing column; 304. Motor 2; 305. Upper slave plate; 3 06. Left loading cylinder; 307. Left cylinder; 308. Left clamping plate; 309. Anti-slip groove one; 310. External cylinder; 311. Left fixing block; 312. Right fixing block; 313. Positioning spring; 314. Arc blade; 315. Stretching cylinder; 316. Upper loading plate; 317. Tension sensor; 318. Right containing sleeve; 319. Right cylinder; 320. Right clamping plate; 321. Anti-slip groove two; 4. Recovery box; 5. Control box. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0038] Example: Figure 1-14 As shown, a tensile testing device for PE protective film of the present invention comprises a mainframe 1, a feeding mechanism 2 is fixedly installed on the upper surface of the left end of the mainframe 1 for feeding and unloading, a detection mechanism 3 is fixedly installed on the upper surface of the right end of the mainframe 1 for performing tensile testing on samples, a recovery box 4 is fixedly connected to the middle position of the upper surface of the mainframe 1, and a control box 5 is fixedly installed at the right front of the lower surface of the mainframe 1; the feeding mechanism 2 comprises a U-shaped bracket 201, the bottom of the U-shaped bracket 201 is fixedly connected to the upper surface of the left end of the mainframe 1, lower screws 202 are embedded in the middle positions of the front and back of the U-shaped bracket 201 through bearings, and the surface of the left end of the lower screw 202 is provided with three sets of reverse threads, and two U-shaped brackets 201 are fixedly connected to upper fixing rods 203 at the top of their inner walls The surfaces of the lower screw 202 and the upper fixed rod 203 are sleeved with three groups of two-way sliding blocks 204, and the number of each group of two-way sliding blocks 204 is two, and every two two-way sliding blocks 204 are respectively threadedly connected with reverse threads, and the top of each group of two-way sliding blocks 204 is fixedly connected to two carriers 205, and the front and back sides of the two carriers 205 are embedded with two inner chucks 206 through bearings; a sample cylinder 207 is sleeved on the ends of the two inner chucks 206 close to each other, and two return plates 208 are fixedly connected to the bottoms of the opposite sides of the two carriers 205, and a U-shaped bracket 201 is located at the front of the lower end thereof. A motor 209 is fixedly installed, and the rear end of the motor 209 is fixedly connected to the front end of the lower screw 202 through a coupling, and the left side of the upper end of the U-shaped bracket 201 is fixedly connected to a receiving trough 210.

[0039] Among them, through the feeding mechanism 2, firstly, the forward rotation of the motor 1 209 can drive the lower screw 202 to rotate forward, and the forward rotation of the lower screw 202 can drive the two bidirectional sliders 204 in each group to move in opposite directions, and the movement of the two bidirectional sliders 204 in opposite directions can drive the two carriers 205 and the two inner chucks 206 to move in opposite directions at the same time. When the two inner chucks 206 are fully inserted into the interior of the sample barrel 207, the installation of multiple sample barrels 207 is quickly completed, so that it is convenient for the staff to quickly complete the feeding of multiple samples, which effectively improves The detection efficiency of the device can be improved by controlling the motor 209 to reverse, which can drive the lower screw 202 to reverse. The reverse rotation of the lower screw 202 can drive the two inner chucks 206 in each group to move in opposite directions. When the two inner chucks 206 are fully separated from the inner cavity of the sample tube 207, the sample tube 207 is quickly disassembled. Finally, the return plate 208 can transfer the fallen sample tube 207 to the left to the inside of the receiving trough 210, thereby completing the automatic discharge of the sample, thereby effectively reducing the labor intensity of the staff and further improving the user experience.

[0040] The detection mechanism 3 includes a main frame plate 301, the lower end of the main frame plate 301 is fixedly connected to the upper surface of the right end of the main platform 1, the middle position of the right side of the main frame plate 301 is embedded with an upper screw 302 through a bearing, and the left sides of the front and rear ends of the main frame plate 301 are fixedly connected with two external stabilizing columns 303, and the middle position of the right side of the main frame plate 301 is fixedly installed with a motor 2 304, and the left end of the motor 2 304 is fixedly connected to the right end of the upper screw 302, and the surfaces of the two external stabilizing columns 303 and the left end of the upper screw 302 are sleeved The upper slave plate 305 is connected, and the hole wall in the middle of the upper slave plate 305 is threadedly connected to the surface of the upper screw rod 302, and the two hole walls in front and behind the upper slave plate 305 are slidably connected to the surfaces of the two outer stabilizing columns 303; three left mounting barrels 306 are fixedly connected to the top of the upper slave plate 305, and a left cylinder 307 is fixedly installed in the middle position of the upper surface of each left mounting barrel 306, and a left clamping plate 308 is fixedly installed at the lower end of each left cylinder 307, and an anti-slip groove 308 is opened on the bottom surface of the inner cavity of each left mounting barrel 306. 9. The right end of each left mounting tube 306 is sleeved with an external tube 310; the middle position of the upper surface of the left end of each left mounting tube 306 is fixedly connected with a left fixed block 311, and the middle position of the upper surface of the left end of each external tube 310 is fixedly connected with a right fixed block 312. The opposite sides of the left fixed block 311 and the right fixed block 312 are fixedly connected with a positioning spring 313, and the arc surface of the right side of the lower end of the external tube 310 is fixedly connected with an arc blade 314; the middle position of the right side of the upper end of the main frame plate 301 is fixedly connected with a left fixed block 311; the left fixed block 311 is fixedly connected with a right fixed block 312; the right side of the lower end of the main frame plate 301 is fixedly connected with a left fixed block 312; the left fixed block 311 is fixedly connected with a right fixed block 312; the right side of the lower end of the main frame plate 301 is fixedly connected with a right fixed block 312; the left fixed block 311 is fixedly connected with a right fixed block 312; the right side of the lower end of the main frame plate 301 is fixedly connected with a left fixed block 311; the left fixed block 311 is fixedly connected with a right fixed block 312; the right side of the lower end of the main frame plate 301 is fixedly connected with a right fixed block 312 ... right side A stretching cylinder 315 is fixedly installed in a position, and the left end of the stretching cylinder 315 is fixedly connected to an upper loading plate 316; three tension sensors 317 are fixedly installed on the left side of the upper loading plate 316; the left end of each tension sensor 317 is fixedly connected to a right containing sleeve 318; a right cylinder 319 is fixedly installed in the middle position of the upper surface of each right containing sleeve 318, and a right clamping plate 320 is fixedly connected to the lower end of each right cylinder 319; an anti-slip groove 321 is provided on the lower surface of the inner cavity of the right containing sleeve 318.

[0041] Among them, through the detection mechanism 3, first the curved blade 314 can cut the broken sample, and then the right cylinder 319 is controlled to start to drive the right clamping plate 320 to separate from the surface of the sample. At this time, the broken sample on the right side will automatically fall downward to the inside of the recycling box 4 with its own gravity, thereby effectively completing the automatic collection of waste materials, and then the motor 2 304 is controlled to rotate forward to drive the upper screw 302 to rotate forward, and the upper screw 302 can drive the upper slave plate 305 to move to the right, and the upper slave plate 305 can move to the right to drive the three left loading barrels 306 and the three external barrels 310 to move to the right at the same time, and the three left loading barrels 306 can move to the right to drive the ends of the three samples to move to the right, and when the external barrel 310 contacts the left end surface of the right sleeve 318 to the right, the left loading barrel 3 06 continues to move to the right and the external cylinder 310 will shrink. At this time, the sample end in the external cylinder 310 will be automatically pushed into the right housing 318. At this time, starting the right cylinder 319 can drive the right clamping plate 320 to clamp the sample downward again, thereby quickly completing the automatic feeding of the sample and greatly reducing the labor of the staff. Finally, starting the left cylinder 307 can drive the left clamping plate 308 to separate from the sample, and then reversing the motor 2 304 can drive the left cylinder 306 to move to the left to the initial position. At this time, starting the left cylinder 307 can drive the left clamping plate 308 to clamp the sample downward again, thereby enabling the detection device to have the function of continuous detection, thereby greatly improving the detection efficiency of the sample and further improving the practicality of the entire device.

[0042] When working, first, the end of the PE protective film on the sample tube 207 is passed through the inner cavity of the left mounting tube 306 and the outer tube 310 respectively, and is placed to the right into the right housing 318. At this time, the left cylinder 307 and the right cylinder 319 are controlled to start at the same time. The start of the left cylinder 307 can drive the left clamping plate 308 to move downward. When the left clamping plate 308 presses the PE protective film downward into the anti-slip groove 1 309, the clamping of the left ends of multiple samples is effectively completed. Then, the start of the right cylinder 319 can drive the right clamping plate 320 to move downward. When the right clamping plate 320 presses the sample downward into the anti-slip groove 2 321 At this time, the clamping of the right ends of multiple samples is effectively completed. The coordination of the anti-slip groove 1 309 and the anti-slip groove 2 321 can effectively improve the stability of the sample after clamping. Finally, the control of the stretching cylinder 315 to start can drive the three tension sensors 317 to move to the right. The three tension sensors 317 moving to the right can drive the three right containment sleeves 318 and the right ends of the samples to move to the right at the same time. When the three samples are broken, the tension sensor 317 can detect the tension value in time, thereby quickly completing the synchronous detection of multiple samples, and the detection results of multiple samples can speed up the analysis and recording of the samples by the detection personnel.

[0043] Secondary feeding of samples: first, the curved blade 314 can cut the broken samples, and then the right cylinder 319 is controlled to start to drive the right clamping plate 320 to separate from the surface of the sample. At this time, the broken sample on the right side will automatically fall downward to the inside of the recycling box 4 with its own gravity, thereby effectively completing the automatic collection of waste materials. Then, the motor 2 304 is controlled to rotate forward to drive the upper screw 302 to rotate forward, and the upper screw 302 can drive the upper slave plate 305 to move to the right. The upper slave plate 305 moves to the right and can drive the three left loading barrels 306 and the three external barrels 310 to move to the right at the same time. The three left loading barrels 306 move to the right and can drive the ends of the three samples to move to the right. When the external barrel 310 moves to the right and aligns with the right containing sleeve When the left end surface of 318 contacts, the left loading cylinder 306 continues to move to the right, which will cause the external cylinder 310 to shrink. At this time, the sample end in the external cylinder 310 will be automatically pushed into the inside of the right housing 318. At this time, the right cylinder 319 is controlled to start to drive the right clamping plate 320 to clamp the sample again downward, so that the automatic feeding of the sample is completed quickly, which greatly reduces the labor of the staff. Finally, the left cylinder 307 is controlled to start to drive the left clamping plate 308 to separate from the sample, and then the motor 2 304 is controlled to reverse to drive the left loading cylinder 306 to move to the left to the initial position. At this time, the left cylinder 307 is controlled to start to drive the left clamping plate 308 to clamp the sample again downward, so that the detection device can have the function of continuous detection.

[0044] Installation and replacement of sample barrel 207: First, control motor 1 209 to rotate forward to drive lower screw 202 to rotate forward, and lower screw 202 to rotate forward to drive two bidirectional sliders 204 in each group to move in opposite directions, and the two bidirectional sliders 204 to move in opposite directions can drive two carriers 205 and two inner chucks 206 to move in opposite directions at the same time. When the two inner chucks 206 are fully inserted into the interior of sample barrel 207, the installation of multiple sample barrels 207 is quickly completed, so that it is convenient for staff to quickly complete the feeding of multiple samples, effectively improving the detection efficiency of the device, and then control motor 1 209 to reverse to drive The lower screw 202 is reversed, and the reverse rotation of the lower screw 202 can drive the two inner chucks 206 in each group to move in opposite directions. When the two inner chucks 206 are fully separated from the inner cavity of the sample tube 207, the sample tube 207 is quickly disassembled. Finally, the return plate 208 can transfer the dropped sample tube 207 to the left to the inside of the receiving trough 210, thus completing the automatic discharge of the sample. At this time, another sample tube 207 is placed between the two inner chucks 206, and then controlling the motor 1 209 to rotate forward can drive the two inner chucks 206 to clamp three new samples to be tested respectively, thereby facilitating the detection mechanism 3 to detect the new samples to be tested.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tensile testing device for PE protective film, comprising a main unit (1), characterized in that: A feeding mechanism (2) is fixedly mounted on the upper surface of the left end of the main platform (1) for feeding and unloading, a detection mechanism (3) is fixedly mounted on the upper surface of the right end of the main platform (1) for performing tensile testing on samples, a recovery box (4) is fixedly connected to the middle of the upper surface of the main platform (1), and a control box (5) is fixedly mounted on the right front of the lower surface of the main platform (1); The feeding mechanism (2) comprises a U-shaped bracket (201), the bottom of the U-shaped bracket (201) is fixedly connected to the upper surface of the left end of the main machine platform (1), the middle position of the front and back of the U-shaped bracket (201) is embedded with a lower screw rod (202) through a bearing, and the surface of the left end of the lower screw rod (202) is provided with three groups of reverse threads, the top of the inner wall of the two U-shaped brackets (201) is fixedly connected with an upper fixed rod (203), the surface of the lower screw rod (202) and the upper fixed rod (203) is sleeved with three groups of bidirectional sliding blocks (204), and the number of each group of bidirectional sliding blocks (204) is two, and every two bidirectional sliding blocks (204) are respectively threadedly connected with the reverse threads, and the top of each group of bidirectional sliding blocks (204) is fixedly connected with two carriers (205), and the front and back of the two carriers (205) are embedded with two inner chucks (206) through bearings.

2. A tensile testing device for PE protective film according to claim 1, characterized in that: A sample tube (207) is sleeved on one end of the two inner chucks (206) close to each other, and two return plates (208) are fixedly connected to the bottom of the opposite sides of the two carriers (205). A motor 1 (209) is fixedly installed on the front side of the lower end of the U-shaped bracket (201), and the rear end of the motor 1 (209) is fixedly connected to the front end of the lower screw (202) through a coupling. A material receiving trough (210) is fixedly connected to the left side of the upper end of the U-shaped bracket (201).

3. A tensile testing device for PE protective film according to claim 1, characterized in that: The detection mechanism (3) comprises a main frame plate (301), the lower end of the main frame plate (301) is fixedly connected to the upper surface of the right end of the main platform (1), an upper screw rod (302) is embedded in the middle of the right side of the main frame plate (301) through a bearing, two outer stabilizing columns (303) are fixedly connected to the left sides of the front and rear ends of the main frame plate (301), a second motor (304) is fixedly installed in the middle of the right side of the main frame plate (301), and the left end of the second motor (304) is fixedly connected to the right end of the upper screw rod (302), the surfaces of the two outer stabilizing columns (303) and the left end of the upper screw rod (302) are both sleeved with an upper slave plate (305), and the hole wall in the middle of the upper slave plate (305) is threadedly connected to the surface of the upper screw rod (302), and the two hole walls in front and rear of the upper slave plate (305) are slidably connected to the surfaces of the two outer stabilizing columns (303).

4. A tensile testing device for PE protective film according to claim 3, characterized in that: Three left mounting tubes (306) are fixedly connected to the top of the upper sub-plate (305), a left cylinder (307) is fixedly installed at the middle position of the upper surface of each left mounting tube (306), a left clamping plate (308) is fixedly installed at the lower end of each left cylinder (307), an anti-slip groove (309) is provided on the bottom surface of the inner cavity of each left mounting tube (306), and an external tube (310) is sleeved on the outside of the right end of each left mounting tube (306).

5. A tensile testing device for PE protective film according to claim 4, characterized in that: A left fixed block (311) is fixedly connected to the middle position of the upper surface of the left end of each left mounted tube (306), a right fixed block (312) is fixedly connected to the middle position of the upper surface of the left end of each external tube (310), a positioning spring (313) is fixedly connected to the opposite side of the left fixed block (311) and the right fixed block (312), and a curved blade (314) is fixedly connected to the curved surface of the right side surface of the lower end of the external tube (310).

6. A tensile testing device for PE protective film according to claim 5, characterized in that: A stretching cylinder (315) is fixedly installed at the middle position of the right side of the upper end of the main frame plate (301), and the left end of the stretching cylinder (315) is fixedly connected to an upper loading plate (316).

7. A tensile testing device for PE protective film according to claim 6, characterized in that: Three tension sensors (317) are fixedly mounted on the left side of the upper loading plate (316).

8. A tensile testing device for PE protective film according to claim 7, characterized in that: The left end of each tension sensor (317) is fixedly connected to a right housing sleeve (318).

9. A tensile testing device for PE protective film according to claim 8, characterized in that: A right cylinder (319) is fixedly installed at the middle position of the upper surface of each right housing sleeve (318), and a right clamping plate (320) is fixedly connected to the lower end of each right cylinder (319).

10. A tensile testing device for PE protective film according to claim 9, characterized in that: The lower surface of the inner cavity of the right housing sleeve (318) is provided with a second anti-slip groove (321).

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