A tensile strength testing apparatus for heat transfer films

Abstract

The application relates to the technical field of film tensile strength detection, in particular to a tensile strength detection equipment for heat transfer printing film, which comprises a base, a fixed plate connected to the top of the base, a linear motor installed on the top of the base, a movable plate connected to the linear motor, a tension sensor installed on the movable plate and the fixed plate, an electric clamp installed on the two tension sensors, a U-shaped frame connected to the top of the base, a sample placing table in sliding mode arranged on the upper portion of the U-shaped frame and used for placing samples, a cutting mechanism arranged on the placing table and used for cutting the samples, a pushing mechanism arranged on the U-shaped frame and used for pushing the top plate to move upwards and lifting the samples upwards. The application can automatically cut the heat transfer printing film samples, automatically switch the heat transfer printing film samples, continuously perform the heat transfer printing film tensile strength detection operation, greatly shorten the detection waiting time, greatly reduce the detection period and greatly improve the detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of thin film tensile strength testing technology, and in particular to a tensile strength testing device for heat transfer films. Background Technology

[0002] Heat transfer film is a special thin film used to transfer patterns, text, or images onto surfaces of different materials. This technology is widely used in industries such as textiles, ceramics, and metal processing. Through the action of heat and pressure, the coating on the heat transfer film can be transferred onto the target object.

[0003] To ensure that the film can withstand a certain tension during the heat transfer process without breaking or deforming, and to meet specific application requirements (such as flexibility and tensile strength), tensile strength testing of the heat transfer film is necessary. Currently, a film tensile strength testing machine is commonly used to accomplish this task. This equipment consists of a main unit, electric clamps, sensors, a control system, and a measurement system, and measures the tensile strength of the heat transfer film by applying a longitudinal tensile load. However, in practical applications, existing film tensile strength testing machines have the following shortcomings:

[0004] 1. Lack of automated strip cutting mechanism: To ensure the consistency of the heat transfer film during testing, large pieces of heat transfer film need to be pre-cut into multiple strip samples. However, existing film tensile strength testing machines cannot automate this process. The heat transfer film must be manually processed using a strip cutting instrument before being placed in the testing machine. This requires manual handling of the heat transfer film between two devices, which is not only time-consuming but also reduces overall testing efficiency.

[0005] 2. Lack of an automatic sample switching mechanism: To obtain accurate and reliable test data and comprehensively evaluate the tensile properties of the heat transfer film, a new sample needs to be replaced after each test for multiple tests. Current testing machines do not support automatic sample switching, meaning the entire process requires manual intervention, increasing the testing cycle and reducing efficiency. Furthermore, frequent manual operation may increase the risk of accidental injury, affecting safety. Summary of the Invention

[0006] The purpose of this invention is to provide a tensile strength testing device for heat transfer film of a sample that can automatically cut the sample into strips and automatically switch the sample to solve the above problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a tensile strength testing device for heat transfer film, comprising a base, a fixed plate connected to the top of the base, a linear motor mounted on the top of the base, a movable plate connected to the linear motor, a tension sensor mounted on both the movable plate and the fixed plate, an electric clamp mounted on each of the two tension sensors, a U-shaped frame connected to the top of the base between the two electric clamps, a slidable placement platform for placing a sample on the upper part of the U-shaped frame, a cutting mechanism for cutting the sample on the placement platform, the cutting mechanism including a lifting frame connected above the placement platform via a telescopic rod, cutters spaced at the bottom of the lifting frame, a driving component mounted on the placement platform for driving the lifting frame to move the cutters up and down to cut the sample, a top plate on the placement platform, an opening on the placement platform for lifting the top plate, a pushing mechanism on the U-shaped frame for pushing the top plate up to lift the sample upwards, and a driving component inside the U-shaped frame for driving the placement platform to move horizontally back and forth.

[0008] Preferably, the bottom surface of the top plate is flat, the top surface is curved, the middle part of the cutter is curved, and the two sides are horizontal.

[0009] Preferably, the electric clamp includes a fixed clamping block connected to the tension sensor. The fixed clamping block is L-shaped, and a movable clamping block is slidably connected to the inner wall of the L-shaped fixed clamping block. A cylinder for driving the movable clamping block to rise and fall is installed at the bottom of the fixed clamping block.

[0010] Preferably, the pushing mechanism includes a push plate rotatably connected to the inside of the U-shaped frame via a rotating shaft. The push plate is located below the top plate. A lifting plate is connected to the movable clamping block of the electric clamp on the same side as the fixed plate. A cam is connected to one end of the rotating shaft near the lifting plate. A slot is opened at the eccentric position of the cam. A short shaft located in the slot is connected to the lower part of the lifting plate.

[0011] Preferably, a downward pressure rod is connected to the movable clamping block of one of the electric clamps for pressing down the sample so that both ends of the sample enter the two electric clamps respectively.

[0012] Preferably, hollow rods are installed at intervals on the lifting frame, and the hollow rods and the cutter are staggered. A pressing rod for pressing the sample is slidably connected inside the hollow rod, and a spring is connected between the pressing rod and the hollow rod.

[0013] Preferably, the drive assembly includes two drive motors respectively mounted on the inner walls of both sides of the U-shaped frame, with gears connected to the output shafts of the drive motors, and two racks connected to the bottom of the placement platform, with the two racks meshing with the two gears respectively.

[0014] Preferably, baffles are connected to the sides of the fixed plate and the movable plate that are close to each other, to prevent the broken sample from entering the linear motor.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. Through the cooperation of the placement platform, top plate, and cutting mechanism, large heat transfer film samples can be cut into multiple strips, realizing automatic strip cutting of heat transfer film samples. This eliminates the need for manual handling of the samples between the strip cutting instrument and the tensile strength testing equipment, saving time and labor and improving work efficiency. The pushing mechanism lifts the top plate upwards, raising the heat transfer film sample so that both ends of the tested sample can be removed from the two electric clamps. The drive assembly drives the placement platform to move the top plate horizontally, removing the tested sample from the electric clamps and allowing the next sample to be tested to be moved. The sample is aligned with the electric clamps, and the top plate moves down to release the heat transfer film sample. The two ends of the heat transfer film sample aligned with the electric clamps naturally move into the two electric clamps respectively, achieving automatic switching of the heat transfer film sample without manual switching. This saves time and effort, further improving work efficiency, reducing manual intervention, lowering the risk of accidental injury, and improving safety. Therefore, this invention can automatically cut heat transfer film samples into strips and automatically switch between them, enabling continuous heat transfer film tensile strength testing operations, greatly shortening the testing waiting time, significantly reducing the testing cycle, and greatly improving testing efficiency.

[0017] 2. The pressure rod can press down the heat transfer film sample aligned with the electric clamp, so that both ends of the heat transfer film sample enter the two electric clamps respectively, ensuring that the heat transfer film sample can be firmly clamped by the electric clamp, thereby ensuring the smooth completion of the tensile strength test.

[0018] 3. The combination of the hollow rod and the spring not only allows the pressing rod to press and fix the heat transfer film sample to prevent displacement when the heat transfer film sample is cut by the cutter, thus ensuring the accuracy of the heat transfer film sample cutting, but also allows the heat transfer film sample to be pushed off the cutter to prevent it from adhering to the cutter and moving upward with it, thereby ensuring the smooth operation of the heat transfer film sample tensile strength test. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a schematic diagram showing the connection of the electric clamp, U-shaped frame, placement platform, top plate, and drive assembly of the present invention.

[0021] Figure 3 This is a three-dimensional structural diagram of the electric clamp of the present invention.

[0022] Figure 4This is a three-dimensional structural diagram of the platform, top plate, and cutter of the present invention.

[0023] Figure 5 This is a schematic diagram showing the installation of the cutting mechanism, pushing mechanism, and driving components of the present invention.

[0024] Figure 6 This is a three-dimensional structural diagram of the actuation mechanism and drive components of the present invention.

[0025] Figure 7 This is a schematic diagram showing the installation of the pressure rod, hollow rod, pressing rod, and spring of the present invention.

[0026] Figure 8 This is a schematic diagram of the installation of the baffle of the present invention.

[0027] In the diagram: 1-Base, 2-Fixed plate, 3-Linear motor, 4-Moving plate, 5-Tension sensor, 6-Electric clamp, 61-Fixed clamping block, 62-Cylinder, 63-Moving clamping block, 7-U-shaped frame, 71-Guide block, 8-Placement platform, 80-Opening, 81-U-shaped platform, 82-Slotted slide plate, 83-Guide rod, 90-Telescopic rod, 91-Drive component, 92-Lifting frame, 921-Horizontal plate, 922-Inverted U-shaped plate, 93-Cutter, 10-Top plate, 111-Rotating shaft, 112-Push plate, 113-Cam, 114-Slot, 115-Lifting plate, 116-Short shaft, 121-Drive motor, 122-Gear, 123-Rack, 13-Pressing rod, 14-Hollow rod, 15-Pressing rod, 16-Spring, 17-Baffle, 18-Sample. Detailed Implementation

[0028] See Figures 1-3A tensile strength testing device for heat transfer film includes a base 1, a fixed plate 2 connected to the top right side of the base 1, a linear motor 3 mounted on the top of the base 1 on the left side of the fixed plate 2, a movable plate 4 connected to the slider of the linear motor 3, and tension sensors 5 mounted on the upper parts of the movable plate 4 and the fixed plate 2 on their adjacent sides. Electric clamps 6 are mounted on both tension sensors 5, and each electric clamp 6 includes a fixed clamping block 61 connected to the tension sensor 5. The fixed clamping block 61 is L-shaped. A movable clamping block 63 is slidably connected to the inner wall of the fixed clamping block 61 via a sliding groove. A cylinder 62 is installed at the bottom of the fixed clamping block 61, and the piston rod of the cylinder 62 passes through the fixed clamping block 61 and is connected to the movable clamping block 63 to drive the movable clamping block 63 to rise and fall. A U-shaped frame 7 located between the two electric clamps 6 is connected to the top of the base 1. The lower part of the U-shaped frame 7 has a receiving groove for accommodating the linear motor 3. L-shaped guide blocks 71 are connected to the upper part of the inner walls on both the left and right sides of the U-shaped frame 7. A placement platform 8 for placing the heat transfer film sample 18 is slidably provided on the upper part of the U-shaped frame 7. The placement platform 8 includes a U-shaped platform 81, slotted slide plates 82, and guide rods 83. The U-shaped platform 81 is slidably mounted on the top of the U-shaped frame 7. Two slotted slide plates 82 located inside the U-shaped frame 7 are connected to the bottom of the U-shaped platform 81. The two slotted slide plates 82 are slidably connected to two L-shaped guide blocks 71 via slots. The L-shaped guide blocks 71 guide the forward and backward movement of the slotted slide plates 82, ensuring the smooth back-and-forth movement of the entire placement platform 8. Two sets of guide rods 83 are connected to the bottom of the U-shaped platform 81, and the two sets of guide rods 83 are located on the two slotted slide plates. Between the plates 82, there are two guide rods 83 in each group, and the two guide rods 83 in each group are symmetrically arranged front and back. The two groups of guide rods 83 are slidably connected to a top plate 10 for lifting the heat transfer film sample 18 upward. The U-shaped stage 81 has an opening 80 for lifting the top plate 10. The U-shaped stage 81 is equipped with a cutting mechanism for cutting the heat transfer film sample 18. The U-shaped frame 7 is equipped with a pushing mechanism for pushing the top plate 10 upward to lift the heat transfer film sample 18 upward. The U-shaped frame 7 is equipped with a driving component for driving the slotted slide plate 82 to move back and forth.

[0029] See Figures 4-5The cutting mechanism includes two telescopic rods 90 connected to the rear side of the U-shaped platform 81. A lifting frame 92 located above the U-shaped platform 81 is connected between the two telescopic rods 90. The lifting frame 92 includes two horizontal plates 921 and three inverted U-shaped plates 922. The two horizontal plates 921 are respectively connected to the two telescopic rods 90. The three inverted U-shaped plates 922 are evenly spaced between the two horizontal plates 921 from front to back. A cutter 93 for cutting the heat transfer film sample 18 is connected to the bottom of each of the three inverted U-shaped plates 922. Two driving components 91 are connected to the front side of the U-shaped platform 81. The two driving components 91 are respectively connected to the two horizontal plates 921 on the lifting frame 92 to drive the lifting frame 92 to move the cutter 93 up and down to cut the heat transfer film sample 18. In a specific implementation, the driving component 91 is an electric push rod, and the bottom surface of the top plate 10 is a plane. The top surface of the top plate 10 is curved, and the middle section of the cutter 93 is curved, while the left and right sides are horizontal. The top surface of the top plate 10 is designed to be curved, which works in conjunction with the cutter 93, which has a curved middle section and horizontal left and right sides. This allows the heat transfer film sample 18 to be completely cut during the cutting process without the need for manual secondary cutting. The curved design of the top surface of the top plate 10 allows the heat transfer film sample 18 to form an arc arch when it is lifted upward, providing a large space for falling. In this way, after the top plate 10 moves down to release the heat transfer film sample 18, the two ends of the heat transfer film sample 18 can naturally move into the fixed clamping block 61 and the movable clamping block 63 of the two electric clamps 6, respectively, without the need for additional position adjustment. This design ensures that the heat transfer film sample 18 can be accurately and securely clamped, which is conducive to the smooth progress of subsequent tensile strength testing operations.

[0030] See Figures 5-6 The pushing mechanism includes a rotating shaft 111 rotatably connected to the U-shaped frame 7. A push plate 112 located inside the U-shaped frame 7 is connected to the rotating shaft 111. The push plate 112 is located below the top plate 10. A cam 113 is connected to the right end of the rotating shaft 111. A slot 114 is opened on the eccentric position of the cam 113. An L-shaped lifting plate 115 is connected to the top of the movable clamping block 63 of the right electric clamp 6. A short shaft 116 located in the slot 114 is connected to the lower part of the lifting plate 115.

[0031] See Figures 5-6 The drive assembly includes two drive motors 121 respectively installed on the inner walls of the left and right sides of the U-shaped frame 7. The output shaft of the drive motor 121 is connected to a gear 122. The bottom of the placement platform 8 is connected to two racks 123. The bottom of the two slotted slide plates 82 on the placement platform 8 is connected to racks 123. The two racks 123 mesh with the two gears 122 respectively.

[0032] Initially, the top plate 10 is lifted upwards by the push plate 112, and the arc surface of the top surface of the top plate 10 is higher than the U-shaped platform 81 on the placement table 8. A large heat transfer film sample 18 is first placed on the top plate 10. The middle part of the heat transfer film sample 18 is then lifted upwards by the top plate 10, forming an arc-shaped arch. The two ends of the heat transfer film sample 18 are respectively attached to the inner bottom surface of the U-shaped platform 81 on the placement table 8. The two ends of the heat transfer film sample 18 are not located between the fixed clamping block 61 and the movable clamping block 63 of the electric clamp 6 to ensure that the heat transfer film sample 18 is completely cut during the subsequent strip cutting process. Next, the control drive 91 drives the lifting frame 92 to move the cutter 93 reciprocally downwards and upwards. The three cutters 93 move downwards to cooperate with the top plate 10 and the U-shaped platform 81, cutting the large heat transfer film sample 18 into four strip samples. Then, the control cylinder 62 drives the movable clamping block 63 to move downward. The downward movement of the movable clamping block 63 on the right side causes the lifting plate 115 to move downward. The downward movement of the lifting plate 115 pushes the cam 113 to rotate backward and downward through the short shaft 116. The short shaft 116 then slides in the slot 114 of the cam 113, thereby driving the rotating shaft 111 to drive the push plate 112 to rotate backward and downward to release the top plate 10. Under the action of its own gravity, the top plate 10 moves downward to release the heat transfer film sample 18. The heat transfer film sample 18 moves downward under the action of its own gravity, so that the two ends of the heat transfer film sample 18 at the front end (the heat transfer film sample 18 aligned with the electric clamp 6) can naturally move into the fixed clamping block 61 and the movable clamping block 63 of the two electric clamps 6 respectively. After the end of the heat transfer film sample 18 is moved between the fixed clamping block 61 and the movable clamping block 63, the movable clamping block 63 continues to move down to clamp and fix the end of the heat transfer film sample 18 on the fixed clamping block 61.

[0033] Subsequently, the linear motor 3 drives the movable plate 4 to move to the left, which in turn drives the left electric clamp 6 to move to the left via the left tension sensor 5, applying tension to the heat transfer film sample 18 to stretch it and thus achieve tensile strength testing. The tension sensor 5 can detect the magnitude of the tension in real time. By electrically connecting the tension sensor 5 to the display screen, the tension value can be transmitted to the display screen for display, so that the testing personnel can know the magnitude of the tension applied to the heat transfer film sample 18. After completing a tensile strength test, the cylinder 62 is first controlled to drive the movable clamp 63 to move upward and release the heat transfer film sample 18. The movable clamp 63 on the right side moves upward and drives the lifting plate 115 to move upward. The upward movement of the lifting plate 115 pushes the cam 113 to rotate forward and upward through the short shaft 116, thereby driving the rotating shaft 111 to drive the push plate 112 to rotate forward and upward and lift the top plate 10 upward. The upward movement of the top plate 10 lifts the heat transfer film sample 18 upward, so that the two ends of the heat transfer film sample 18 after the test are removed from the two electric clamps 6.

[0034] Then, the drive motor 121 is controlled to drive the gear 122 to rotate. The rotation of the gear 122 pushes the rack 123, which in turn moves the slotted slide plate 82 forward, thereby moving the entire placement stage 8 forward. This, in turn, moves the cutting mechanism, the top plate 10, and the heat transfer film sample 18 forward. This allows the tested heat transfer film sample 18 to be moved away from the electric clamp 6, while the next heat transfer film sample 18 to be tested is moved forward until it is aligned with the electric clamp 6. Then, the cylinder 62 is controlled to drive the movable clamp block 63 to move downward, causing the top plate 10 to move downward and release the heat transfer film sample 18. The two ends of the heat transfer film sample 18 aligned with the electric clamp 6 then naturally move into the two electric clamps 6 respectively, realizing the automatic switching of the heat transfer film sample 18. When the last heat transfer film sample 18 is tested, the drive motor 121 is controlled to drive the gear 122 to reverse. The reverse rotation of the gear 122 pushes the rack 123, which in turn moves the slotted slide plate 82 backward to reset, thereby moving the entire placement stage 8 and its components backward to reset.

[0035] Thus, this device, through the cooperation of the placement platform 8, the top plate 10, and the cutting mechanism, can cut a large heat transfer film sample 18 into four strips, achieving automatic strip cutting of the heat transfer film sample 18. This eliminates the need for manual handling of the sample between the strip cutting instrument and the tensile strength testing equipment, saving time and effort and improving work efficiency. The pushing mechanism lifts the top plate 10 upwards, raising the heat transfer film sample 18 so that both ends of the tested sample 18 are removed from the two electric clamps 6. The drive assembly then drives the placement platform 8 to move the top plate 10 horizontally, removing the tested sample 18 from the electric clamps 6, allowing the next sample to be tested to be placed in the next clamp. Sample 18 is moved to be aligned with the electric clamp 6, and the top plate 10 moves down to release the heat transfer film sample 18. The two ends of the heat transfer film sample 18 aligned with the electric clamp 6 naturally move into the two electric clamps 6 respectively, realizing automatic switching of the heat transfer film sample 18 without manual switching, thus saving time and effort, further improving work efficiency, reducing manual intervention, reducing the risk of accidental injury, and improving safety. Thus, this device can automatically cut the heat transfer film sample 18 into strips and automatically switch the heat transfer film sample 18, thereby enabling continuous heat transfer film tensile strength testing operations, greatly shortening the testing waiting time, greatly reducing the testing cycle, and greatly improving testing efficiency.

[0036] See Figures 5-6The top of the movable clamping block 63 of the right electric clamp 6 is connected to a pressing rod 13. The pressing rod 13 is located to the left of the lifting plate 115. The pressing rod 13 is U-shaped. When the movable clamping block 63 of the right electric clamp 6 moves down, it drives the pressing rod 13 to move down, thereby pressing down the heat transfer film sample 18 aligned with the electric clamp 6. This allows both ends of the heat transfer film sample 18 to enter between the fixed clamping block 61 and the movable clamping block 63 of the two electric clamps 6, ensuring that the heat transfer film sample 18 can be firmly clamped by the electric clamp 6, thereby ensuring the smooth completion of the tensile strength test.

[0037] See Figure 7 The bottom of the two horizontal plates 921 on the lifting frame 92 are each connected with four hollow rods 14 evenly spaced from front to back. The hollow rods 14, the inverted U-shaped plate 922 and the cutter 93 are staggered. The hollow rods 14 are slidably connected with pressing rods 15 for pressing the heat transfer film sample 18. The bottom of the pressing rods 15 is lower than the cutter 93. The pressing rods 15 are inverted T-shaped. Springs 16 are sleeved on the inverted T-shaped pressing rods 15. The two ends of the springs 16 are connected to the pressing rods 15 and the hollow rods 14 respectively.

[0038] The lifting frame 92 moves downward, causing the hollow rod 14, pressing rod 15, and spring 16 to move downward as well. Supported by the U-shaped platform 81 on the placement platform 8, when the pressing rod 15 moves down to contact the heat transfer film sample 18, it can no longer move downward. Thus, the lifting frame 92 drives the hollow rod 14 to continue moving downward, compressing the spring 16. Through the elastic force of the spring 16, the pressing rod 15 presses and fixes the heat transfer film sample 18, preventing displacement of the heat transfer film sample 18 when the cutter 93 cuts it subsequently, thereby ensuring the accuracy of the cutting of the heat transfer film sample 18. Because spring 16 is compressed, when the lifting frame 92 moves the hollow rod 14 and the cutter 93 upward, the pressing rod 15 will not move upward synchronously with the cutter 93. This allows the heat transfer film sample 18 to be pushed off the cutter 93, preventing it from adhering to the cutter 93 and moving upward with it. This ensures the smooth operation of the tensile strength test of the heat transfer film sample 18. When spring 16 returns to its original state, the hollow rod 14 continues to move upward, pulling the pressing rod 15 upward through spring 16 to detach it from the heat transfer film sample 18.

[0039] See Figure 8 Both the fixed plate 2 and the movable plate 4 are connected to a baffle 17 on their lower sides that are close to each other. The baffle 17 on the fixed plate 2 is located above the baffle 17 on the movable plate 4. The baffle 17 is located in the receiving groove at the bottom of the U-shaped frame 7 and above the linear motor 3. The baffle 17 can block the broken heat transfer film sample 18 to prevent it from entering the linear motor 3 and affecting the normal operation of the linear motor 3.

Claims

1. A tensile strength testing device for heat transfer film, comprising a base (1), a fixed plate (2) connected to the top of the base (1), a linear motor (3) mounted on the top of the base (1), a movable plate (4) connected to the linear motor (3), a tension sensor (5) mounted on both the movable plate (4) and the fixed plate (2), and an electric clamp (6) mounted on each of the two tension sensors (5), characterized in that, The base (1) is connected to a U-shaped frame (7) between two electric clamps (6) at the top. The upper part of the U-shaped frame (7) is provided with a placement platform (8) for placing the sample (18). The placement platform (8) is provided with a cutting mechanism for cutting the sample (18). The cutting mechanism includes a lifting frame (92) connected above the placement platform (8) by a telescopic rod (90). The bottom of the lifting frame (92) is connected with cutters (93) at intervals. The placement platform (8) is equipped with a device for driving the lifting frame (92) to drive the cutters (93). The driving component (91) for lifting and cutting the sample (18) is provided. The placement platform (8) is provided with a top plate (10). The placement platform (8) has an opening (80) for lifting the top plate (10). The U-shaped frame (7) is provided with a pushing mechanism for pushing the top plate (10) to move upward and lift the sample (18) upward. The U-shaped frame (7) is provided with a driving component for driving the placement platform (8) to move horizontally back and forth. The bottom surface of the top plate (10) is a plane, the top surface is an arc surface, the middle part of the cutter (93) is an arc segment, and the two sides are horizontal segments.

2. The tensile strength testing device for heat transfer film according to claim 1, characterized in that, The electric clamp (6) includes a fixed clamp (61) connected to the tension sensor (5). The fixed clamp (61) is L-shaped. A movable clamp (63) is slidably connected to the inner wall of the L-shaped fixed clamp (61). A cylinder (62) for driving the movable clamp (63) to rise and fall is installed at the bottom of the fixed clamp (61).

3. The tensile strength testing device for heat transfer film according to claim 2, characterized in that, The pushing mechanism includes a push plate (112) rotatably connected to the inside of the U-shaped frame (7) via a rotating shaft (111). The push plate (112) is located on the lower side of the top plate (10). A lifting plate (115) is connected to the movable clamping block (63) of the electric clamp (6) on the same side as the fixed plate (2). A cam (113) is connected to one end of the rotating shaft (111) near the lifting plate (115). A slot (114) is opened on the eccentric position of the cam (113). A short shaft (116) located in the slot (114) is connected to the lower part of the lifting plate (115).

4. The tensile strength testing device for heat transfer film according to claim 3, characterized in that, One of the electric clamps (6) has a pressing rod (13) connected to the movable clamp (63) for pressing down the sample (18) so that both ends of the sample (18) enter the two electric clamps (6) respectively.

5. The tensile strength testing device for heat transfer film according to claim 1, characterized in that, Hollow rods (14) are installed at intervals on the lifting frame (92). The hollow rods (14) and the cutter (93) are staggered. A pressing rod (15) for pressing the sample (18) is slidably connected inside the hollow rod (14). A spring (16) is connected between the pressing rod (15) and the hollow rod (14).

6. The tensile strength testing device for heat transfer film according to claim 1, characterized in that, The drive assembly includes two drive motors (121) installed on the inner walls of both sides of the U-shaped frame (7). The output shaft of the drive motor (121) is connected to a gear (122). The bottom of the placement platform (8) is connected to two racks (123), which mesh with the two gears (122) respectively.

7. The tensile strength testing device for heat transfer film according to claim 1, characterized in that, Both the fixed plate (2) and the movable plate (4) are connected to baffles (17) on the side that are close to each other, which are used to prevent the broken sample (18) from entering the linear motor (3).

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