Tensile test device for protective film

Abstract

The invention provides a tensile testing device for a protective film, and relates to the technical field of tensile detection.The tensile testing device comprises a base, a conveying assembly is arranged at the top of the front end of the base, the conveying assembly comprises a conveying table, limiting plates are arranged on the two sides of the top of the conveying table, a testing assembly is arranged at the top of the middle of the base, and the testing assembly comprises a first sliding rail; the testing assembly comprises two sets of first sliding rails, a vertical plate is slidably installed at the bottoms of the first sliding rails, a side plate is fixed to the bottom of the vertical plate, an upper clamping plate is slidably installed at the upper end of the inner side of the side plate, and a lower clamping plate is rotatably installed at the lower end of the inner side of the side plate. When the protective film is broken, the upper clamping plate and the lower clamping plate on the two sides withdraw outwards along with the elastic force of the spring telescopic rods and are separated from the bidirectional cylinder for testing, the moving distance of the current cylinder can be measured, the bidirectional cylinder is prevented from further stretching out, and the accuracy of the tensile test of the protective film is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tensile testing, in particular to a tensile testing device for protective film. BACKGROUND

[0002] PE protective film is a protective film with polyethylene (PE) plastic film as the base material, which adds acrylic resin as the adhesive and various special additives. This protective film has excellent performance, such as preventing products from being contaminated, corroded, scratched, etc. during production, processing, transportation, storage and use. Tensile property is an important performance index of PE protective film. PE protective film needs to bear tensile load in some applications, such as packaging, covering, etc. Tensile testing can ensure that the protective film will not break or lose its protective effect due to bearing too much load during use, thereby ensuring safety in use. It belongs to new material related services.

[0003] In the prior art, when the protective film reaches the critical point of rupture, it is difficult for a person to accurately measure the value of the critical point during tensile testing of the protective film. After rupture, it may continue to stretch, affecting the accuracy of the test. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application aims to provide a tensile testing device for protective film to solve the problems raised in the background art. The present application has a novel structure. The test assembly clamps both ends of the protective film. When the protective film breaks, the upper clamping plates and the lower clamping plates on both sides are withdrawn outward with the elastic force of the spring extension rod and are separated from the bidirectional cylinder used for testing. The current cylinder movement distance can be measured to avoid further extension of the bidirectional cylinder, thereby improving the accuracy of tensile testing of the protective film.

[0005] In order to achieve the above object, the application is realized by the following technical scheme: a stretching test device for protective film, comprising a base, the front end top of the base is provided with a conveying assembly, the conveying assembly comprises a conveying table, both sides of the top of the conveying table are provided with limiting plates, the middle top of the base is provided with a test assembly, the test assembly comprises a first sliding rail, the first sliding rail is provided with two groups, the bottom of the first sliding rail is slidably installed with a vertical plate, the bottom of the vertical plate is fixed with a side plate, the inner side upper end of the side plate is slidably installed with an upper clamping plate, and the inner side lower end of the side plate is rotatably installed with a lower clamping plate, the bottom of the two side plates is fixedly installed with a double-way air cylinder, the extension end of the double-way air cylinder is connected with the lower clamping plate, the top of the test assembly is provided with a pushing assembly, the pushing assembly comprises a fixed frame, the fixed frame is fixed on the base, and the top of the fixed frame is provided with a screw seat, the surface of the screw seat is symmetrically fixed with a fifth electric push rod, and the extension end of the fifth electric push rod is fixed with a push frame, the straight line position between the conveying table and the upper clamping plate and the lower clamping plate is provided with an intermediate plate, both sides of the intermediate plate are slidably inserted with extension plates, and the side edges of the extension plates are fixedly connected with the limiting plates, and the tail end of the test assembly of the base is placed with a collection frame.

[0006] Further, the test assembly further comprises a second sliding rail, the bottom of one end of the first sliding rail towards the conveying table is provided with a second sliding rail, and the inside of the second sliding rail is symmetrically slidably connected with a sliding block, the outer end of the sliding block is fixed with a spring telescopic rod, and the extension end of the spring telescopic rod is fixedly connected with the side plate, one end of the first sliding rail is fixedly connected with a connecting plate, and the connecting plate is fixedly connected with the sliding block, and both ends of the second sliding rail are fixedly connected with the base.

[0007] Further, the top of the second sliding rail is fixedly connected with a third sliding rail, the inside of the third sliding rail is symmetrically slidably connected with two supporting plates, and the bottom of the supporting plate is slidably connected with the lower clamping plate, the middle of the third sliding rail is fixedly connected with two second springs, and the other end of the second spring is fixedly connected with the supporting plate.

[0008] Further, the inside of the side plate is slidably inserted with a moving plate, and the top of both sides of the moving plate is fixedly connected with a first spring, the bottom of the first spring is fixedly connected with the side plate, the bottom of the moving plate is rotatably connected with a connecting rod through a rotating shaft, the bottom of the lower clamping plate is provided with a second sliding groove corresponding to the position of the connecting rod, and the other end of the connecting rod is slidably arranged along the inside of the second sliding groove.

[0009] Further, the inside surface of the upper clamping plate is symmetrically provided with two first sliding grooves, and the upper clamping plate is slidably arranged along the inside of the first sliding groove, the top of the first sliding groove is fixedly connected with a third electric push rod, the extension end of the third electric push rod is fixedly connected with the upper clamping plate, the middle position of the double-way air cylinder is fixedly connected with a blocking rod, and the blocking rod is located outside the upper clamping plate and the lower clamping plate.

[0010] Further, the top of the fixed frame at the tail end of the test assembly is fixed with two groups of fourth electric push rods, and the extension end of the fourth electric push rod is fixed with a pressing plate, the pressing plate at the extension end of the fourth electric push rod is in extrusion contact with the top of the moving plate, the inner part of the first sliding rail near one end of the second sliding rail is provided with an electric winding shaft, and the electric winding shaft is provided with a pull rope, and the pull rope is fixedly connected with the vertical plate.

[0011] Further, the bottom of the lower clamping plate is fixed with an insertion block, the extension end of the bidirectional air cylinder is fixed with an insertion frame, the insertion block is slidably inserted into the inner part of the insertion frame, and the inner side surfaces of the insertion frame and the insertion block are provided with induction modules.

[0012] Further, the push assembly further comprises a screw rod, the top of the fixed frame is rotatably provided with a screw rod, and a screw seat is threadedly sleeved on the screw rod, the outer side of the protruding plate is fixedly provided with a connecting frame, and the connecting frame is fixedly connected with the limiting plate.

[0013] Further, the conveying assembly further comprises an electric insertion rod, the surface of the limiting plate corresponding to one side of the connecting plate is fixedly provided with an electric insertion rod, the connecting plate is provided with an insertion hole corresponding to the position of the extension end of the electric insertion rod, and the electric insertion rod is inserted into the connecting plate.

[0014] Further, the conveying table is fixedly provided with two groups of first electric push rods on the outer sides, and the extension end of the first electric push rod is fixedly connected with the limiting plate.

[0015] The beneficial effects of the present application are as follows:

[0016] 1. In the moving process of the side plate, the electric winding shaft synchronously unwinds the pull rope, after moving to the tail end of the first sliding rail, the top of the moving plate corresponds to the pressing plate of the fourth electric push rod, the two moving plate top extrusion plates are extruded by the fourth electric push rod, the moving plate moves downward by sliding along the second sliding groove through the connecting rod, the lower clamping plate is opened downward, the broken protective film is dropped into the collecting frame, and then the pull rope is wound by the electric winding shaft, so that the side plate, the upper clamping plate and the lower clamping plate are reset for the next stretching test.

[0017] 2. The present application continuously and slowly pushes the protection film through the bidirectional cylinder, at this time the first sliding rail moves along the inside of the second sliding rail with the slider through the connecting plate, the supporting plate slides along the inside of the third sliding rail and stretches the second spring through the extrusion of the plug, at this time the middle of the bidirectional cylinder has a pull rod, which blocks the outside of the clamped protection film, at this time the elastic force of the spring telescopic rod cannot push the respective side plates to move outward, when the protection film reaches the stretching critical value and breaks, the protection film is divided into two sections and is not blocked by the blocking rod, at this time the elastic force of the spring telescopic rod pushes the side plates outward along the first sliding rail, in this process, the broken protection film clamped by the two sets of upper and lower clamping plates moves, and the plug of the lower clamping plate moves out of the inside of the insertion frame, at this time the bidirectional cylinder stops elongation, and the current length of the bidirectional cylinder elongation is measured.

[0018] 3. The present application moves the screw seat along the horizontal direction by cooperating with the screw rod, when moving to the front end position of the middle plate, the fifth electric push rod drives the push frame to descend, and the push frame pushes the protection film into the upper and lower clamping plates, realizing automatic feeding and discharging of the protection film.

[0019] 4. The present application can adjust the distance of the limiting plate on the conveying table through the first electric push rod, so as to limit the protection film of different lengths, because the outside of the extension plate is connected with the limiting plate through the connecting frame, so the limiting effect on the protection film is still maintained when the protection film enters the middle plate, and in the adjustment process, the elongated end of the electric plug rod is inserted into the insertion hole of the connecting plate, at this time the movement of the limiting plate drives the two sets of upper and lower clamping plates to move and adjust, so that the protection film of different lengths is used, so that when the protection film enters the upper and lower clamping plates from the conveying table, the clamped range of both ends is consistent, avoiding uneven stress, when testing, the elongated end of the electric plug rod is retracted, the connection with the connecting plate is released, and the interference of the connecting plate moving with the stretching test is avoided.

[0020] 5. Compared with the prior art, the present application clamps the two ends of the protection film through the test assembly, when the protection film breaks, the upper and lower clamping plates on both sides are withdrawn outward by the elastic force of the spring telescopic rod and separated from the bidirectional cylinder for testing, the current cylinder movement distance can be measured, further extension of the bidirectional cylinder is avoided, and the accuracy of the protection film stretching test is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the overall structure schematic diagram of the present application for a stretching test device for protection film;

[0022] Figure 2 It is the conveying assembly structure schematic diagram of the present application for a stretching test device for protection film;

[0023] Figure 3The schematic view of the electric inserting rod of the tensile testing device for protecting film is connected with the connecting plate of the present application;

[0024] Figure 4 The schematic view of the testing assembly structure of the tensile testing device for protecting film is connected with the connecting plate of the present application;

[0025] Figure 5 The schematic view of the side plate of the tensile testing device for protecting film is connected with the spring telescopic rod of the present application;

[0026] Figure 6 The schematic view of the upper clamping plate of the tensile testing device for protecting film is connected with the side plate of the present application;

[0027] Figure 7 The schematic view of the lower clamping plate of the tensile testing device for protecting film is connected with the moving plate of the present application;

[0028] Figure 8 The schematic view of the pushing assembly structure of the tensile testing device for protecting film is connected with the connecting plate of the present application.

[0029] In the figure: 1, base; 11, collecting frame; 2, conveying assembly; 21, conveying table; 22, limiting plate; 23, first electric push rod; 24, electric inserting rod; 3, testing assembly; 31, first sliding rail; 32, electric winding shaft; 33, vertical plate; 35, connecting plate; 36, side plate; 37, second sliding rail; 38, third sliding rail; 39, sliding block; 310, spring telescopic rod; 311, supporting plate; 312, bidirectional air cylinder; 313, inserting frame; 314, inserting block; 315, moving plate; 316, first spring; 317, first sliding groove; 318, third electric push rod; 319, upper clamping plate; 320, lower clamping plate; 321, second spring; 322, second sliding groove; 323, connecting rod; 324, fourth electric push rod; 325, blocking rod; 4, pushing assembly; 41, middle plate; 42, extending plate; 43, pushing frame; 44, screw rod; 45, screw seat; 46, fifth electric push rod; 47, connecting frame; 48, fixing frame. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0031] Please refer to Figures 1 to 8The application provides a technical scheme: a stretching testing device for protective film, which comprises a base 1, a conveying assembly 2 is arranged on the top of the front end of the base 1, the conveying assembly 2 comprises a conveying table 21, limit plates 22 are arranged on the top of both sides of the conveying table 21, a testing assembly 3 is arranged on the top of the middle of the base 1, the testing assembly 3 comprises first sliding rails 31, the first sliding rails 31 are provided in two groups, vertical plates 33 are slidingly installed at the bottom of the first sliding rails 31, side plates 36 are fixedly installed at the bottom of the vertical plates 33, upper clamping plates 319 are slidingly installed on the inner side of the upper end of the side plates 36, lower clamping plates 320 are rotatably installed on the inner side of the lower end of the side plates 36, a double-way air cylinder 312 is fixedly installed at the bottom of the two groups of side plates 36 of the base 1, the extension end of the double-way air cylinder 312 is connected with the lower clamping plate 320, a pushing assembly 4 is arranged on the top of the testing assembly 3, the pushing assembly 4 comprises a fixing frame 48, the fixing frame 48 is fixed on the base 1, a screw seat 45 is arranged on the top of the fixing frame 48, fifth electric push rods 46 are fixedly arranged on the surface of the screw seat 45 in a symmetrical mode, push frames 43 are fixedly installed at the extension end of the fifth electric push rods 46, an intermediate plate 41 is arranged on the straight line position between the conveying table 21 and the upper clamping plate 319 and the lower clamping plate 320, protruding plates 42 are slidingly inserted into both sides of the intermediate plate 41, and the side edges of the protruding plates 42 are fixedly connected with the limit plates 22, a collecting frame 11 is arranged at the tail end of the testing assembly 3 of the base 1, when the device is used, the protective film is placed on the conveying table 21, the position of the limit plate 22 is adjusted according to the length of the protective film, the two ends of the protective film are limited, the protective film is conveyed to the intermediate plate 41 through the conveying table 21, the two ends of the protective film are clamped by the upper clamping plate 319 and the lower clamping plate 320 of the testing assembly 3 through the pushing assembly 4, the two groups of upper clamping plates 319 and lower clamping plates 320 are moved to both sides under the leading of the double-way air cylinder 312, the protective film is subjected to stretching test, when the protective film is broken, the side plates 36, the upper clamping plates 319 and the lower clamping plates 320 are moved outward and separated from the double-way air cylinder 312, the broken protective film is sent out, and the extension distance of the double-way air cylinder 312 is measured.

[0032] The test assembly 3 further comprises a second sliding rail 37, the first sliding rail 31 is provided with the second sliding rail 37 at the bottom of one end of the conveying table 21, and the inside of the second sliding rail 37 is symmetrically and slidingly connected with a sliding block 39, and the outer end of the sliding block 39 is fixedly connected with a spring telescopic rod 310, and the elongated end of the spring telescopic rod 310 is fixedly connected with the side plate 36, one end of the first sliding rail 31 located at the second sliding rail 37 is fixedly connected with a connecting plate 35, and the connecting plate 35 is fixedly connected with the sliding block 39, and the two ends of the second sliding rail 37 are fixedly connected with the base 1, and the top of the second sliding rail 37 is fixedly connected with a third sliding rail 38, the inside of the third sliding rail 38 is symmetrically and slidingly connected with two supporting plates 311, and the supporting plates 311 are in sliding contact with the bottom of the lower clamping plate 320, two second springs 321 are fixedly connected with the middle of the third sliding rail 38, and the other end of the second spring 321 is fixedly connected with the supporting plate 311, the inside of the side plate 36 is slidingly connected with a moving plate 315, the top of the moving plate 315 is fixedly connected with a first spring 316 on both sides, the bottom of the first spring 316 is fixedly connected with the side plate 36, the bottom of the moving plate 315 is rotatably connected with a connecting rod 323 through a rotating shaft, the bottom of the lower clamping plate 320 is provided with a second sliding groove 322 corresponding to the position of the connecting rod 323, the other end of the connecting rod 323 is slidingly arranged along the inside of the second sliding groove 322, two first sliding grooves 317 are symmetrically formed on the inner side surface of the upper clamping plate 319, and the upper clamping plate 319 is slidingly arranged along the inside of the first sliding groove 317, a third electric push rod 318 is fixedly arranged at the top of the first sliding groove 317, the elongated end of the third electric push rod 318 is fixedly connected with the upper clamping plate 319, a blocking rod 325 is fixedly arranged at the middle position of the two-way air cylinder 312, the blocking rod 325 is located outside the upper clamping plate 319 and the lower clamping plate 320, two groups of fourth electric push rods 324 are fixedly arranged at the top of one side of the tail end of the test assembly 3, and the elongated end of the fourth electric push rod 324 is fixedly connected with a pressing plate, the pressing plate of the elongated end of the fourth electric push rod 324 is in pressing contact with the top of the moving plate 315, an electric winding shaft 32 is internally arranged at one end of the first sliding rail 31 close to the second sliding rail 37, and a pull rope is wound on the electric winding shaft 32, the pull rope is fixedly connected with the vertical plate 33, an insertion block 314 is fixedly arranged at the bottom of the lower clamping plate 320, an insertion frame 313 is fixedly arranged at the elongated end of the two-way air cylinder 312, the insertion block 314 is slidingly inserted into the inside of the insertion frame 313, and an induction module is arranged on the inner side surface of the insertion block 314 and the insertion frame 313, when the side plate 36, the upper clamping plate 319 and the lower clamping plate 320 are located at the top of the two-way air cylinder 312, it is the test mode, the insertion block 314 of the lower clamping plate 320 is inserted into the insertion frame 313 of the two-way air cylinder 312, and the induction module in the insertion block 314 and the insertion frame 313 can be understood as a contact switch, under the insertion state of the two, the two-way air cylinder 312 can be continuously and slowly pushed, and the protective film is stretched for testing, at this time, the first sliding rail 31 moves along the inside of the second sliding rail 37 together with the sliding block 39 through the connecting plate 35,The push plate 311 slides along the third slide rail 38 inside and stretches the second spring 321, at this time, because the middle of the double-way cylinder 312 has a pull rod, the outer side of the clamped protective film is blocked, at this time, the elastic force of the spring telescopic rod 310 cannot push the respective side plates 36 to move outward, when the protective film reaches the stretching critical value and breaks, the protective film is divided into two sections and is not blocked by the blocking rod 325, at this time, the elastic force of the spring telescopic rod 310 pushes the side plates 36 outward along the first slide rail 31, in the process, the two groups of upper clamping plates 319 and lower clamping plates 320 respectively clamped broken protective films move, at the same time, the plug block 314 of the lower clamping plate 320 moves out of the plug frame 313 inside, at this time, the double-way cylinder 312 stops stretching, the current length of the double-way cylinder 312 is measured, in the process of moving the side plates 36, the electric winding shaft 32 synchronously unwinds the pull rope, after moving to the tail end of the first slide rail 31, the top of the moving plate 315 corresponds to the pressing plate of the fourth electric push rod 324, the top of the two moving plates 315 is extruded by the fourth electric push rod 324, in the process of moving downward, the moving plate 315 slides along the second slide groove 322 through the connecting rod 323, and the lower clamping plate 320 is turned downward to open, the clamped broken protective film falls into the collecting frame 11, then the pull rope is wound by the electric winding shaft 32, so that the side plates 36, the upper clamping plates 319 and the lower clamping plates 320 are reset for the next stretching test.

[0033] In the embodiment, the push assembly 4 further comprises a screw rod 44, the screw rod 44 is rotatably installed on the top of the fixing frame 48, a screw seat 45 is threadedly sleeved on the screw rod 44, the outer side of the extending plate 42 is fixedly connected with a connecting frame 47, the connecting frame 47 is fixedly connected with the limiting plate 22, the screw rod 44 is driven by a motor outside the fixing frame 48, the screw rod 44 rotates, the screw seat 45 moves along the horizontal direction in cooperation with the screw rod 44, when moving to the front end position of the middle plate 41, the push frame 43 is driven to descend by the fifth electric push rod 46, the protective film is pushed into the upper clamping plate 319 and the lower clamping plate 320 by the push frame 43, and automatic feeding and discharging of the protective film are realized.

[0034] The conveying assembly 2 further comprises an electric push rod 24, the surface on one side of the limiting plate 22 corresponding to the connecting plate 35 is fixed with the electric push rod 24, the connecting plate 35 is provided with a insertion hole corresponding to the position of the elongated end of the electric push rod 24, and the electric push rod is inserted with the connecting plate 35, two groups of first electric push rods 23 are fixed on the two outer sides of the conveying table 21, and the elongated end of the first electric push rod 23 is fixedly connected with the limiting plate 22, the distance of the limiting plate 22 on the conveying table 21 can be adjusted through the first electric push rod 23, so as to limit the conveying of the protective film with different lengths, because the outer side of the extending plate 42 is connected with the limiting plate 22 through the connecting frame 47, the limiting effect on the protective film is still maintained when the protective film enters the middle plate 41, and in the adjusting process, the elongated end of the electric push rod 24 is inserted into the insertion hole of the connecting plate 35, at this time, the movement of the limiting plate 22 drives the movement of the two groups of upper clamping plates 319 and lower clamping plates 320 for adjustment, the use of the protective film with different lengths makes the range of the two ends of the protective film clamped consistent when the protective film enters between the upper clamping plates 319 and the lower clamping plates 320 from the conveying table 21, and the uneven stress is avoided, in the test, the elongated end of the electric push rod 24 is retracted, the connection with the connecting plate 35 is released, and the interference with the connecting plate 35 moving with the tensile test is avoided.

[0035] When the device is used, the protective film is put on the conveying table 21, the distance of the limiting plate 22 on the conveying table 21 can be adjusted through the first electric push rod 23, so as to limit the conveying of the protective film with different lengths, because the outer side of the extending plate 42 is connected with the limiting plate 22 through the connecting frame 47, so the limiting effect on the protective film is still maintained when the protective film enters the middle plate 41, and in the adjusting process, the extension end of the electric inserting rod 24 is inserted into the insertion hole of the connecting plate 35, at this time, the movement of the limiting plate 22 drives the movement of the two sets of upper clamping plates 319 and lower clamping plates 320 for adjustment, so as to make the clamping range of the two ends of the protective film consistent when the protective film enters between the upper clamping plates 319 and the lower clamping plates 320 from the conveying table 21, and avoid uneven stress, in the test, the extension end of the electric inserting rod 24 is retracted, the connection with the connecting plate 35 is released, the interference of the connecting plate 35 with the stretching test is avoided, the screw rod 44 rotates, the screw seat 45 cooperates with the screw rod 44 to move in the horizontal direction, when the screw seat 45 moves to the front end position of the middle plate 41, the fifth electric push rod 46 drives the push frame 43 to descend, the push frame 43 pushes the protective film into the upper clamping plates 319 and the lower clamping plates 320, the automatic feeding and discharging of the protective film are realized, the bidirectional air cylinder 312 continuously and slowly pushes, the protective film is tested, at this time, the first sliding rail 31 moves along the second sliding rail 37 inside together with the sliding block 39 through the connecting plate 35, the supporting plate 311 slides along the third sliding rail 38 inside and stretches the second spring 321 through the extrusion of the insertion block 314, at this time, because there is a pull rod in the middle of the bidirectional air cylinder 312, the outer side of the clamped protective film is blocked, at this time, the elastic force of the spring telescopic rod 310 cannot push the respective side plates 36 to move outward, when the protective film reaches the stretching critical value and breaks, the protective film is divided into two sections and is not blocked by the blocking rod 325, at this time, the elastic force of the spring telescopic rod 310 pushes the side plates 36 outward along the first sliding rail 31, in this process, the two sets of upper clamping plates 319 and lower clamping plates 320 move respectively clamped broken protective film, at the same time, the insertion block 314 of the lower clamping plate 320 moves out of the insertion frame 313, at this time, the bidirectional air cylinder 312 stops elongation, the current length of the bidirectional air cylinder 312 is measured, in the movement process of the side plates 36, the electric winding shaft 32 synchronously unwinds the pull rope, after moving to the tail end of the first sliding rail 31, the top of the moving plate 315 corresponds to the pressing plate of the fourth electric push rod 324, the two moving plates 315 are extruded by the fourth electric push rod 324, in the downward movement process of the moving plate 315, the moving plate 315 slides along the second sliding groove 322 through the connecting rod 323, the lower clamping plate 320 is turned downward and opened, the clamped broken protective film falls into the collection frame 11, then the pull rope is wound by the electric winding shaft 32, so that the side plates 36, the upper clamping plates 319 and the lower clamping plates 320 are reset for the next stretching test.

[0036] The foregoing merely illustrates the principles of the application and various embodiments are now described with reference to the drawings. This application is not limited to the embodiments described but is intended to encompass any and all changes and modifications within the spirit and scope of the underlying principles thereof. Thus, to those skilled in the art, it will be apparent from this disclosure that various modifications and changes can be made in the implementation without departing from the true spirit and scope of the application.

[0037] In addition, it should be understood that although the description herein is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description herein is made only for the sake of clarity, and those skilled in the art should understand the description as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A tensile testing device for a protective film, comprising a base (1), characterized in that: The base (1) has a conveying assembly (2) at the top front end. The conveying assembly (2) includes a conveying platform (21). Limiting plates (22) are provided on both sides of the top of the conveying platform (21). The base (1) has a testing assembly (3) at the top middle. The testing assembly (3) includes a first slide rail (31). The first slide rail (31) has two sets. A vertical plate (33) is slidably installed at the bottom of the first slide rail (31). A side plate (36) is fixed at the bottom of the vertical plate (33). An upper clamping plate (319) is slidably installed on the upper inner side of the side plate (36). A lower clamping plate (320) is rotatably installed on the lower inner side of the side plate (36). A bidirectional cylinder (312) is fixedly installed at the bottom of the two sets of side plates (36) on the base (1). The extended end of the bidirectional cylinder (312) is connected to... The lower clamping plate (320) is connected, and the top of the test assembly (3) is provided with a push assembly (4). The push assembly (4) includes a fixing frame (48), which is fixed on the base (1). The top of the fixing frame (48) is provided with a screw seat (45). A fifth electric push rod (46) is symmetrically fixed on the surface of the screw seat (45), and a push frame (43) is fixed at the extended end of the fifth electric push rod (46). An intermediate plate (41) is provided on the straight line between the conveying table (21) and the upper clamping plate (319) and the lower clamping plate (320). An extension plate (42) is slidably inserted on both sides of the intermediate plate (41), and the side of the extension plate (42) is fixedly connected to the limiting plate (22). A collection frame (11) is placed at the tail end of the test assembly (3) on the base (1).

2. The tensile testing device for a protective film according to claim 1, characterized in that: The test assembly (3) further includes a second slide rail (37). The bottom of the first slide rail (31) facing the conveyor table (21) is provided with the second slide rail (37), and the second slide rail (37) is symmetrically connected to a slider (39). The outer end of the slider (39) is fixed with a spring telescopic rod (310), and the extended end of the spring telescopic rod (310) is fixedly connected to the side plate (36). The first slide rail (31) is located at one end of the second slide rail (37) and a connecting plate (35) is fixedly connected to the slider (39). The two ends of the second slide rail (37) are fixedly connected to the base (1).

3. The tensile testing device for a protective film according to claim 2, characterized in that: The top of the second slide rail (37) is fixed with a third slide rail (38). The third slide rail (38) has two symmetrical sliding plates (311) inside, and the plates (311) slide in contact with the bottom of the lower clamping plate (320). The middle of the third slide rail (38) has two second springs (321), and the other end of the second springs (321) is fixedly connected to the plates (311).

4. The tensile testing device for a protective film according to claim 3, characterized in that: A movable plate (315) is slidably inserted into the side plate (36), and a first spring (316) is fixed on both sides of the top of the movable plate (315). The bottom of the first spring (316) is fixedly connected to the side plate (36). A connecting rod (323) is rotatably connected to the bottom of the movable plate (315) through a rotating shaft. A second sliding groove (322) is opened at the bottom of the lower clamping plate (320) corresponding to the position of the connecting rod (323). The other end of the connecting rod (323) slides along the inside of the second sliding groove (322).

5. A tensile testing device for a protective film according to claim 4, characterized in that: Two first sliding grooves (317) are symmetrically opened on the inner surface of the upper clamping plate (319), and the upper clamping plate (319) slides along the inside of the first sliding groove (317). A third electric push rod (318) is fixed at the top of the first sliding groove (317). The extended end of the third electric push rod (318) is fixedly connected to the upper clamping plate (319). A stop bar (325) is fixed at the middle position of the bidirectional cylinder (312). The stop bar (325) is located outside the upper clamping plate (319) and the lower clamping plate (320).

6. A tensile testing device for a protective film according to claim 5, characterized in that: The fixing frame (48) is located on the top of the test assembly (3) with two sets of fourth electric push rods (324) fixed on one side. The extended end of the fourth electric push rod (324) is fixed with a pressure plate. The pressure plate at the extended end of the fourth electric push rod (324) is pressed against the top of the moving plate (315). The first slide rail (31) is equipped with an electric winding shaft (32) at one end near the second slide rail (37). A pull rope is wound on the electric winding shaft (32). The pull rope is fixedly connected to the vertical plate (33).

7. A tensile testing device for a protective film according to claim 6, characterized in that: The bottom of the lower clamping plate (320) is fixed with a plug block (314), the extended end of the bidirectional cylinder (312) is fixed with a plug frame (313), the plug block (314) is slidably inserted into the plug frame (313), and a sensing module is provided on the inner surface of the plug frame (313) and the plug block (314).

8. A tensile testing device for a protective film according to claim 7, characterized in that: The pushing component (4) also includes a screw (44), the top of the fixing frame (48) is rotatably mounted with the screw (44), and the screw seat (45) is threaded onto the screw (44). The outer side of the protruding plate (42) is fixed with a connecting frame (47), and the connecting frame (47) is fixedly connected to the limiting plate (22).

9. A tensile testing device for a protective film according to claim 2, characterized in that: The conveying assembly (2) also includes an electric insertion rod (24). The electric insertion rod (24) is fixed on the surface of the limiting plate (22) on the side corresponding to the connecting plate (35). The connecting plate (35) has an insertion hole at the position corresponding to the extended end of the electric insertion rod (24), and the electric push rod is inserted into the connecting plate (35).

10. A tensile testing device for a protective film according to claim 9, characterized in that: Two sets of first electric push rods (23) are fixed on the two outer sides of the conveyor table (21), and the extended ends of the first electric push rods (23) are fixedly connected to the limiting plate (22).

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