Tension resilience testing device for cold-drawn film

Abstract

The invention belongs to the technical field of tension testing, and particularly relates to a tension resilience testing device for a cold-drawn film, the tension resilience testing device comprises a testing table top and a film body, a linear sliding rail is fixedly mounted on the right side of the top of the testing table top, a moving frame is movably mounted on the linear sliding rail, and a moving roller is rotatably mounted on the moving frame through a rotating shaft; a positioning frame is fixedly mounted on the left side of the top of the test table board, a positioning roller is rotationally mounted on the positioning frame through a rotating shaft, and the film body is connected between the moving roller and the positioning roller. According to the invention, the movable frame is connected through the connecting plate, so that the movable frame can drive the sliding table to slide on the synchronous sliding rod, and then when the movable roller moves and pulls the film body, the Z-axis guide rail synchronously moves, so that the jacking push rod can always jack the mounting plate upwards, and the horizontal movement and the lifting movement of the movable roller can be independently or simultaneously carried out; therefore, the tension resilience test of the cold-drawn film is more diversified.

Description

Technical Field

[0001] The invention relates to a tensile rebound testing device, in particular to a tensile rebound testing device for a cold-stretched film. Background Art

[0002] Films are often used in daily life. If the film is easily damaged, it will directly affect the quality of use, especially cold-stretched film. Therefore, special measuring instruments are needed to test the tensile force of the film to ensure its quality.

[0003] For example, the Chinese utility model patent with application number 202121566444.3 discloses a "film tensile testing device", which also belongs to the technical field of film tensile testing, and the scheme "includes a supporting base, the upper end surface of the supporting base is fixedly connected to the test base, the upper end surface of the test base is slidably connected to a traction plate, and the front end side wall of the traction plate is slidably connected to a clamping plate, and the traction plate is provided with a driving mechanism for driving the clamping plate to clamp the film, and the upper end surface of the test base is provided with a limiting mechanism for limiting the position of the traction plate during the movement of the traction plate. The utility model has a reasonable structure. By setting a driving mechanism and a power mechanism, convenient clamping of the film during the film pulling process and power output during the pulling process are realized, the structure of the testing device is simplified, and by setting a torque meter, the torque change of the motor during the film pulling process is measured and compared, thereby ensuring the diversification of reference data during the film tensile test, ensuring the accuracy of the test data, and improving the accuracy of the tensile test.

[0004] In the above technology, when the film roller is fixed during operation, the film is always in a stretched state and may exceed the stretching limit and break at any time, that is, the stretching length is difficult to control. If the film breaks, the traction mechanism in the above scheme loses the traction force on the film; and the test direction is relatively single, and the performance of the film cannot be tested more perfectly. In view of this, the present invention designs a tensile rebound test device for cold-stretched film. Summary of the invention

[0005] The main purpose of the present disclosure is to provide a tensile rebound testing device for cold-stretched films, so as to effectively solve the problems raised by the inventor in the above-mentioned background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A tensile rebound test device for cold-stretched film, comprising a test table and a film body, a linear slide rail is fixedly installed on the right side of the top of the test table, and a moving frame is movably installed on the linear slide rail, a moving roller is rotatably installed on the moving frame via a rotating shaft, a positioning frame is fixedly installed on the left side of the top of the test table, and a positioning roller is rotatably installed on the positioning frame via a rotating shaft, and the film body is connected between the moving roller and the positioning roller;

[0008] Two side plates are fixedly installed on the top of the mobile frame, and telescopic columns are slidably connected in the top grooves of the two side plates. The tops of the telescopic columns are fixedly connected to mounting plates, and the mobile rollers are movably installed between the two mounting plates. A compression spring is fixedly connected between the mounting plate and the side plates, and the telescopic columns pass through the compression springs.

[0009] A left-right moving mechanism, the left-right moving mechanism is used to drive the moving frame to move left-right;

[0010] A clamping mechanism, wherein the clamping mechanism is used to fix the film body;

[0011] A pushing mechanism, the pushing mechanism is used to drive the installation plate to move;

[0012] A synchronization mechanism is used in conjunction with the left-right moving mechanism and the pushing mechanism.

[0013] Preferably, the left and right moving mechanism includes a rail groove, an X-axis adjusting screw, a first control servo motor and a limit rod. A rail groove is opened on the top of the linear slide rail, and an X-axis adjusting screw is rotatably installed in the rail groove. A moving frame is threadedly installed on the X-axis adjusting screw, and the upper end of the moving frame extends out of the rail groove. A limit rod parallel to the X-axis adjusting screw is fixedly installed in the rail groove, and the moving frame is slidably installed on the limit rod. The first control servo motor is fixedly installed on the side of the linear slide rail, and one end of the X-axis adjusting screw is fixedly connected to the output end of the first control servo motor.

[0014] Preferably, a clamping mechanism is provided in both the moving roller and the positioning roller, and the clamping mechanism includes a positioning rail, a push rod, an extrusion plate, and a sleeve spring. Three positioning rails distributed in a ring array are fixedly installed in the moving roller and the positioning roller, a push rod is slidably installed on one of the positioning rails, one end of the push rod is fixedly connected to the extrusion plate, and the positioning rollers of the moving roller are provided with retraction and release arc openings, and the two sides of the film body respectively extend into the two retraction and release arc openings, the extrusion plate faces the retraction and release arc openings, the other end of the push rod is fixedly connected to the arc-shaped protrusion, a sleeve spring is fixedly connected between the extrusion plate and the positioning rail, and the push rod passes through the sleeve spring.

[0015] Preferably, the moving roller and the positioning roller are both rotatably installed with an inner screw, and a conical moving block is threadedly installed on the inner screw. Two sliding blocks are fixedly connected to the side of the conical moving block, and the two sliding blocks are respectively slidably connected to the other two positioning rails, and the end of the push rod away from the extrusion plate is toward the conical moving block.

[0016] Preferably, one end of the inner screw movably passes through the rotating shaft and is fixedly connected to an external handle, and a winding motor is fixedly installed on one of the mounting plates, and the output end of the winding motor is fixedly connected to the rotating shaft on the movable roller.

[0017] Preferably, the pushing mechanism includes a Z-axis guide rail, a lifting push rod, a docking plate, a second servo control motor, and a pushing gear. The Z-axis guide rail is installed below the test table, and the lifting push rod is slidably connected in the Z-axis guide rail. The lower end between the two mounting plates is fixedly connected to the docking plate. An operating hole is opened in the middle of the movable frame, and a through-long hole is opened on the test table, and the through-long hole corresponds to the rail groove. The top of the lifting push rod passes through the through-long hole, the rail groove and the operating hole in sequence and is fixedly connected to the docking plate. A motor seat is fixedly installed on the outer side of the Z-axis guide rail, and a second control servo motor is fixedly installed on the motor seat. The output end of the second control servo motor is fixedly connected to the pushing gear. The lower end of the lifting push rod is divided into a rack, and the pushing gear is meshed with the rack.

[0018] Preferably, the synchronization mechanism includes support frame legs, synchronization slide bars, a slide table and a connecting plate, a plurality of support frame legs are fixedly installed on the bottom of the test table, a synchronization slide bar is fixedly connected between the support frame legs on both sides, a slide table is slidably installed on the synchronization slide bar, and a connecting plate is fixedly connected to the top of the slide table, the top of the connecting plate passes through a through-long hole and is fixedly connected to the movable frame, and the Z-axis guide rail is fixedly installed on the slide table.

[0019] Preferably, the length of the through hole is smaller than the length of the rail groove.

[0020] Preferably, when the lifting push rod is located at the lowest end, the positioning roller and the moving roller are at the same height.

[0021] Preferably, the film body is a cold-stretched film.

[0022] In view of this, compared with the prior art, the beneficial effects of the present invention are:

[0023] (III) In the present application, the two sides of the cold-stretched film that needs the tensile rebound test are respectively slid into the arc openings of the positioning roller and the moving roller, and then the external handle is turned to rotate the inner screw, that is, the frustum-shaped moving block moves forward, and the slider slides on the positioning rail to limit the movement of the frustum-shaped moving block. The side of the frustum-shaped moving block will push the arc-shaped raised end of the push rod, so that the push rod drives the extrusion plate to move, and the extrusion plate fixes the side of the cold-stretched film, and the sleeve spring is stretched, thereby making the film body fixed before the test. When releasing the fixation, the external handle can be turned in the opposite direction to make the frustum-shaped moving block release the pressure on the push rod, thereby releasing the fixation of the film body, and the loading and unloading operations for testing are very convenient.

[0024] (ii) In the present application, after both sides of the film body are fixed, the first control servo motor is operated to drive the X-axis adjusting screw to rotate, and then the moving frame slides on the limit rod in the direction away from the positioning frame and stops, that is, the moving roller moves together and stretches the film body, so that the film body can be tested for tensile rebound, and because the distance between the positioning roller and the moving roller changes, different external forces can be applied during the test, and it can also be applied to test films of different lengths.

[0025] (III) In the present application, the tensile rebound test can be performed in different directions. During the test, the second servo control motor works, which will drive the push gear to rotate. The push gear will drive the lifting push rod to move upward, so that the docking plate drives the mounting plate to move, and then the moving roller realizes the upward movement, so that the film body can be tilted and stretched, and the test can be performed at multiple angles to more comprehensively test the performance of the film body.

[0026] (IV) In the present application, the movable frame is connected by a connecting plate so that it can drive the slide to slide on the synchronous slide rod. Then, when the movable roller moves and pulls the film body, the Z-axis guide rail moves synchronously, so that the lifting push rod can always lift the mounting plate upward. The horizontal movement and the upward movement of the movable roller can be performed separately or simultaneously, thereby making the tensile rebound test of the cold-stretched film more diverse. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Shown is a schematic structural diagram of a tensile rebound testing device for cold-stretched films provided by the present invention;

[0028] Figure 2 Shown Figure 1 Schematic diagram of the local structure in;

[0029] Figure 3 The figure shows a cross-sectional view of the structure of the tensile rebound testing device for cold-stretched film provided by the present invention;

[0030] Figure 4 Shown Figure 3Schematic diagram of the local structure in;

[0031] Figure 5 Shown Figure 4 Schematic diagram of the local structure in;

[0032] Figure 6 Shown is a side cross-sectional view of the connection between the moving frame and the linear slide rail;

[0033] Figure 7 Shown Figure 3 The enlarged schematic diagram of point A in the middle;

[0034] Figure 8 Shown is a top view of the linear slide;

[0035] Fig. 9 The frustum type shift block is shown.

[0036] icon:

[0037] 1-test table; 100-through long hole; 101-support frame leg; 102-synchronous slide bar; 103-slide table; 104-connecting plate;

[0038] 2-linear slide rail; 201-rail groove; 202-X-axis adjustment screw rod; 203-first control servo motor; 204-limit rod;

[0039] 3-mobile frame; 3a-mobile roller; 301-side plate; 302-telescopic column; 303-mounting plate; 304-compression spring;

[0040] 4-positioning frame; 4a-positioning roller;

[0041] 5-Z-axis guide rail; 501-lifting push rod; 502-docking plate; 503-second servo control motor; 504-driving gear;

[0042] 6-film body; 601-winding motor; 602-positioning rail; 603-push rod; 604-extrusion plate; 605-sleeve spring; 606-inner screw; 607-cone-shaped moving block; 608-sliding block; 609-external handle. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figure 1-9 , the present invention provides the following embodiments:

[0045] A tensile rebound test device for cold-stretched film, comprising a test table 1 and a film body 6, a linear slide rail 2 is fixedly installed on the right side of the top of the test table 1, and a moving frame 3 is movably installed on the linear slide rail 2, a moving roller 3a is rotatably installed on the moving frame 3 through a rotating shaft, a positioning frame 4 is fixedly installed on the left side of the top of the test table 1, and a positioning roller 4a is rotatably installed on the positioning frame 4 through a rotating shaft, and the film body 6 is connected between the moving roller 3a and the positioning roller 4a;

[0046] Two side plates 301 are fixedly installed on the top of the mobile frame 3, and telescopic columns 302 are slidably connected in the top grooves of the two side plates 301. The top of the telescopic columns 302 is fixedly connected to a mounting plate 303. The mobile roller 3a is movably installed between the two mounting plates 303. A compression spring 304 is fixedly connected between the mounting plate 303 and the side plate 301, and the telescopic column 302 passes through the compression spring 304.

[0047] A left-right moving mechanism, which is used to drive the moving frame 3 to move left-right;

[0048] A clamping mechanism, the clamping mechanism is used to fix the film body 6;

[0049] A pushing mechanism, which is used to drive the mounting plate 303 to move;

[0050] The synchronous mechanism is used in conjunction with the left and right moving mechanism and the pushing mechanism.

[0051] Specifically, the left and right moving mechanism includes a rail groove 201, an X-axis adjusting screw rod 202, a first control servo motor 203 and a limit rod 204. A rail groove 201 is opened on the top of the linear slide rail 2, and the X-axis adjusting screw rod 202 is rotatably installed in the rail groove 201. A moving frame 3 is threadedly installed on the X-axis adjusting screw rod 202. The upper end of the moving frame 3 extends out of the rail groove 201. A limit rod 204 arranged parallel to the X-axis adjusting screw rod 202 is fixedly installed in the rail groove 201, and the moving frame 3 is slidably installed on the limit rod 204. The first control servo motor 203 is fixedly installed on the side of the linear slide rail 2, and one end of the X-axis adjusting screw rod 202 is fixedly connected to the output end of the first control servo motor 203.

[0052] Specifically, a clamping mechanism is provided in the moving roller 3a and the positioning roller 4a, and the clamping mechanism includes a positioning rail 602, a push rod 603, an extrusion plate 604, and a sleeve spring 605. Three positioning rails 602 distributed in a ring array are fixedly installed in the moving roller 3a and the positioning roller 4a, a push rod 603 is slidably installed on one of the positioning rails 602, and one end of the push rod 603 is fixedly connected to the extrusion plate 604. The positioning roller 4a of the moving roller 3a is provided with a retractable arc opening, and both sides of the film body 6 extend into the two retractable arc openings respectively, and the extrusion plate 604 faces the retractable arc opening. The other end of the push rod 603 is fixedly connected to form an arc-shaped protrusion, and a sleeve spring 605 is fixedly connected between the extrusion plate 604 and the positioning rail 602, and the push rod 603 passes through the sleeve spring 605.

[0053] Specifically, an inner screw 606 is rotatably installed in the moving roller 3a and the positioning roller 4a, and a conical moving block 607 is threadedly installed on the inner screw 606. Two sliders 608 are fixedly connected to the side of the conical moving block 607, and the two sliders 608 are respectively slidably connected to the other two positioning rails 602, and the end of the push rod 603 away from the extrusion plate 604 is toward the conical moving block 607.

[0054] Specifically, one end of the inner screw 606 movably passes through the rotating shaft and is fixedly connected to an external handle 609, and a winding motor 601 is fixedly installed on one of the mounting plates 303, and the output end of the winding motor 601 is fixedly connected to the rotating shaft on the moving roller 3a.

[0055] Specifically, the pushing mechanism includes a Z-axis guide rail 5, a lifting push rod 603501, a docking plate 502, a second servo control motor 503, and a pushing gear 504. The Z-axis guide rail 5 is installed below the test table 1, and the lifting push rod 603501 is slidably connected in the Z-axis guide rail 5. The lower end between the two mounting plates 303 is fixedly connected with the docking plate 502. An operation hole is opened in the middle of the movable frame 3. A through-long hole 100 is opened on the test table 1, and the through-long hole 100 corresponds to the rail groove 201. The top end of the lifting push rod 603501 passes through the through-long hole 100, the rail groove 201 and the operation hole in sequence and is fixedly connected to the docking plate 502. A motor seat is fixedly installed on the outer side of the Z-axis guide rail 5, and a second control servo motor is fixedly installed on the motor seat. The output end of the second control servo motor is fixedly connected with the pushing gear 504. The lower end of the lifting push rod 603501 is divided into a rack, and the pushing gear 504 is meshed with the rack.

[0056] Specifically, the synchronization mechanism includes support legs 101, synchronization slide bars 102, slide tables 103 and connecting plates 104. A plurality of support legs 101 are fixedly installed at the bottom of the test table 1. Synchronization slide bars 102 are fixedly connected between the support legs 101 on both sides. A slide table 103 is slidably installed on the synchronization slide bars 102, and a connecting plate 104 is fixedly connected to the top of the slide table 103. The top of the connecting plate 104 passes through the through-long hole 100 and is fixedly connected to the movable frame 3. The Z-axis guide rail 5 is fixedly installed on the slide table 103.

[0057] Specifically, the length of the through hole 100 is smaller than the length of the rail groove 201 .

[0058] Specifically, when the lifting push rod 603501 is located at the lowest end, the positioning roller 4a and the moving roller 3a are at the same height. Specifically, the film body 6 is a cold-stretched film.

[0059] The specific implementation of this embodiment is as follows: the two sides of the cold-stretched film that needs to be tested for tensile rebound are respectively slid into the arc openings of the positioning roller 4a and the moving roller 3a, and then the external handle 609 is turned to rotate the internal screw 606, that is, the frustum-shaped moving block 607 moves forward, and the slider 608 slides on the positioning rail 602 to limit the movement of the frustum-shaped moving block 607. The side of the frustum-shaped moving block 607 will push the arc-shaped protruding end of the push rod 603, so that the push rod 603 drives the extrusion plate 604 to move, and the extrusion plate 604 fixes the side of the cold-stretched film, and the sleeve spring 605 is stretched, so that the film body 6 is fixed before the test. When releasing the fixation, the external handle 609 can be reversed to make the frustum-shaped moving block 607 release the pressure on the push rod 603, thereby releasing the fixation of the film body 6, and the test loading and unloading operations are very convenient;

[0060] After both sides of the film body 6 are fixed, the first control servo motor 203 works to drive the X-axis adjusting screw 202 to rotate, and then the moving frame 3 slides on the limit rod 204 in the direction away from the positioning frame 4 and stops, that is, the moving roller 3a moves together and stretches the film body 6, so that the film body 6 can be tested for tensile rebound, and because the distance between the positioning roller 4a and the moving roller 3a changes, different external forces can be applied during the test, and it can also be applied to test films of different lengths;

[0061] The above is a horizontal stretching test, and a tensile rebound test can also be performed in different directions. During the test, the second servo control motor 503 works, which drives the push gear 504 to rotate, and the push gear 504 drives the jacking push rod 501 to move upward, so that the docking plate 502 drives the mounting plate 303 to move upward, and then the moving roller 3a realizes the upward movement, so that the film body 6 can be tilted and stretched, and the test can be performed at multiple angles to more comprehensively test the performance of the film body;

[0062] The movable frame 3 is connected through the connecting plate 104, so that it can drive the slide 103 to slide on the synchronous slide bar 102, and then when the movable roller 3a moves and pulls the film body 6, the Z-axis guide rail 5 moves synchronously, so that the lifting push rod 501 can always lift the mounting plate 303 upwards, and the horizontal movement and upward movement of the movable roller 3a can be carried out separately or simultaneously, thereby making the tensile rebound test of the cold-stretched film more diverse.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0064] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A tensile rebound test device for cold-stretched film, characterized in that: The invention comprises a test table (1) and a film body (6); a linear slide rail (2) is fixedly installed on the right side of the top of the test table (1); a moving frame (3) is movably installed on the linear slide rail (2); a moving roller (3a) is rotatably installed on the moving frame (3) via a rotating shaft; a positioning frame (4) is fixedly installed on the left side of the top of the test table (1); a positioning roller (4a) is rotatably installed on the positioning frame (4) via a rotating shaft; and the film body (6) is connected between the moving roller (3a) and the positioning roller (4a); Two side plates (301) are fixedly installed on the top of the mobile frame (3), and telescopic columns (302) are slidably connected in the grooves on the tops of the two side plates (301). The tops of the telescopic columns (302) are fixedly connected with mounting plates (303), and the mobile rollers (3a) are movably installed between the two mounting plates (303). A compression spring (304) is fixedly connected between the mounting plates (303) and the side plates (301), and the telescopic columns (302) pass through the compression springs (304); A left-right moving mechanism, the left-right moving mechanism is used to drive the moving frame (3) to move left-right; A clamping mechanism, the clamping mechanism being used to fix the film body (6); A pushing mechanism, the pushing mechanism being used to drive the mounting plate (303) to move; A synchronization mechanism is used in conjunction with the left-right moving mechanism and the pushing mechanism.

2. A tensile rebound testing device for cold-stretched film according to claim 1, characterized in that: The left-right moving mechanism comprises a rail groove (201), an X-axis adjusting screw rod (202), a first control servo motor (203) and a limit rod (204); the top of the linear slide rail (2) is provided with a rail groove (201), and the X-axis adjusting screw rod (202) is rotatably installed in the rail groove (201); a moving frame (3) is threadedly installed on the X-axis adjusting screw rod (202), and the upper end of the moving frame (3) extends out of the rail groove (201); a limit rod (204) arranged parallel to the X-axis adjusting screw rod (202) is fixedly installed in the rail groove (201), and the moving frame (3) is slidably installed on the limit rod (204); the first control servo motor (203) is fixedly installed on the side of the linear slide rail (2), and one end of the X-axis adjusting screw rod (202) is fixedly connected to the output end of the first control servo motor (203).

3. A tensile rebound testing device for cold-stretched film according to claim 2, characterized in that: The moving roller (3a) and the positioning roller (4a) are both provided with a clamping mechanism, and the clamping mechanism comprises a positioning rail (602), a push rod (603), an extrusion plate (604), and a sleeve spring (605). The moving roller (3a) and the positioning roller (4a) are both fixedly installed with three positioning rails (602) distributed in a ring array, and a push rod (603) is slidably installed on one of the positioning rails (602), and one end of the push rod (603) is fixedly connected to There is an extrusion plate (604), and the positioning roller (4a) of the movable roller (3a) is provided with a retractable arc opening. The two sides of the film body (6) extend into the two retractable arc openings respectively. The extrusion plate (604) faces the retractable arc opening, and the other end of the push rod (603) is fixedly connected to form an arc-shaped protrusion. A sleeve spring (605) is fixedly connected between the extrusion plate (604) and the positioning rail (602), and the push rod (603) passes through the sleeve spring (605).

4. A tensile rebound testing device for cold-stretched film according to claim 3, characterized in that: An inner screw (606) is rotatably installed inside the moving roller (3a) and the positioning roller (4a), and a conical moving block (607) is threadedly installed on the inner screw (606). Two sliders (608) are fixedly connected to the side of the conical moving block (607), and the two sliders (608) are respectively slidably connected to the other two positioning rails (602), and the end of the push rod (603) away from the extrusion plate (604) is oriented toward the conical moving block (607).

5. A tensile rebound testing device for cold-stretched film according to claim 4, characterized in that: One end of the inner screw (606) movably passes through the rotating shaft and is fixedly connected to an external handle (609); a winding motor (601) is fixedly installed on one of the mounting plates (303); and the output end of the winding motor (601) is fixedly connected to the rotating shaft on the moving roller (3a).

6. A tensile rebound testing device for cold-stretched film according to claim 5, characterized in that: The pushing mechanism comprises a Z-axis guide rail (5), a lifting push rod (603) (501), a docking plate (502), a second servo control motor (503), and a pushing gear (504); the Z-axis guide rail (5) is installed below the test table (1), and the lifting push rod (603) (501) is slidably connected inside the Z-axis guide rail (5); the lower end between the two mounting plates (303) is fixedly connected with the docking plate (502); an operating hole is opened in the middle of the moving frame (3), and a through-length hole (100) is opened on the test table (1); The through-hole (100) corresponds to the rail groove (201), the top end of the lifting push rod (603) (501) passes through the through-hole (100), the rail groove (201) and the operation hole in sequence and is fixedly connected to the docking plate (502), the outer side of the Z-axis guide rail (5) is fixedly installed with a motor seat, and a second control servo motor is fixedly installed on the motor seat, the output end of the second control servo motor is fixedly connected with a pushing gear (504), the lower end of the lifting push rod (603) (501) is divided into a rack, and the pushing gear (504) is meshed with the rack.

7. A tensile rebound testing device for cold-stretched film according to claim 6, characterized in that: The synchronization mechanism comprises a support frame leg (101), a synchronization slide bar (102), a slide table (103) and a connecting plate (104); a plurality of support frame legs (101) are fixedly installed at the bottom of the test table (1); a synchronization slide bar (102) is fixedly connected between the support frame legs (101) on both sides; a slide table (103) is slidably installed on the synchronization slide bar (102); and a connecting plate (104) is fixedly connected to the top of the slide table (103); the top of the connecting plate (104) passes through the through-long hole (100) and is fixedly connected to the moving frame (3); and the Z-axis guide rail (5) is fixedly installed on the slide table (103).

8. The tensile rebound testing device for cold-stretched film according to claim 6, characterized in that: The length of the through-hole (100) is smaller than the length of the rail groove (201).

9. The tensile rebound testing device for cold-stretched film according to claim 7, characterized in that: When the lifting push rod (603) (501) is located at the lowest end, the positioning roller (4a) and the moving roller (3a) are at the same height.

10. The tensile rebound testing device for cold-stretched film according to claim 1, characterized in that: The film body (6) is a cold-stretched film.

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