Tension detection equipment for bopp film production and method of use thereof

Abstract

The application discloses a tension detection equipment for BOPP film production and a use method thereof, which comprises a lifting plate and a base. A through groove is formed in the middle of the lifting plate. Four telescopic columns are slidably connected in the through groove. The top ends of the four telescopic columns are all welded with fixing plates. The bottom parts of the four telescopic columns are all provided with sleeve columns. The bottom end of the telescopic column and the inner bottom part of the sleeve column are welded with the same spring. The base is provided with four synchronous movement mechanisms for synchronously moving the sleeve columns. The top of the lifting plate is provided with an arc-shaped block. The bottom ends of the arc-shaped block are both welded with stand columns. The middle part of one of the stand columns is provided with a second electric connector. The side of the lifting plate is provided with a first electric connector. The top center of the base is provided with a tension mechanism. The application can fix the two ends of the BOPP film at the same time, saves time and effort, can guarantee that the film is in a tension state, is convenient for subsequent tension detection, does not need manual naked eye judgment of whether the film is stretched, and makes the tension detection more accurate. The tension detection steps are relatively simple.

Description

Technical Field

[0001] This invention relates to the field of film testing, and more particularly to a tensile testing device for BOPP film production and its usage method. Background Technology

[0002] BOPP film, or biaxially oriented polypropylene film, is made by co-extruding polypropylene granules into sheets, followed by stretching in both longitudinal and transverse directions. Due to the oriented molecular structure, this film exhibits good physical stability, mechanical strength, and airtightness, as well as high transparency and gloss. It is also tough and wear-resistant, making it a widely used printing film. The typical thickness is 20–40 μm, with 20 μm being the most common. BOPP film is subjected to external tensile forces during use. To prevent BOPP film failure, it must be designed to withstand these forces without deformation; therefore, tensile testing is necessary.

[0003] Existing tensile testing equipment for BOPP film production cannot simultaneously fix both ends of the film during the fixing process. It requires fixing each end separately, which is time-consuming and labor-intensive. Furthermore, it is difficult to ensure that the film is in a taut state during the fixing process, which is not conducive to subsequent tensile testing. Moreover, existing tensile testing equipment for BOPP film production cannot determine the tensile limit value of the film. It requires manual visual judgment to determine whether the film is stretched, which has a large error and low accuracy of tensile testing. Summary of the Invention

[0004] This invention discloses a tensile testing device for BOPP film production and its usage method, aiming to solve the technical problems in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A tensile testing device for BOPP film production includes a lifting plate and a base. The lifting plate has a through groove in its center, and four telescopic columns are slidably connected within the groove. Each of the four telescopic columns has a fixed plate welded to its top. Each of the four telescopic columns has a sleeve at its bottom. A single spring is vertically welded between the bottom of each telescopic column and the bottom of the sleeve. The base has a synchronous moving mechanism for the four sleeves to move synchronously. An arc-shaped block is horizontally positioned directly above the lifting plate, with columns vertically welded to both ends of its bottom. A second electrical connector is installed in the center of one of the columns. A first electrical connector is installed in the center of one side of the lifting plate. A tensile mechanism is located at the center of the top of the base.

[0007] In a preferred embodiment, the lifting plate is located directly above the base, the four fixed plates are slidably connected to the top of the lifting plate, and the telescopic column is inserted into the sleeve column and slidably connected to the sleeve column.

[0008] In a preferred embodiment, the synchronous movement mechanism includes a forward and reverse motor and lead screws. The forward and reverse motors are horizontally fixedly installed in the middle of one side of the base. There are two lead screws, which are horizontally welded together. The two lead screws are horizontally rotatably connected to the middle of the base. One end of one of the lead screws passes through one side of the base and is fixedly connected to the output shaft of the forward and reverse motor. Each end of the two lead screws is fitted with a moving block. All four moving blocks are connected to the two lead screws by threads. The thread directions at both ends of the two lead screws are opposite. The top ends of the four moving blocks are welded to the bottom ends of four sleeves, respectively. A strip groove is formed in the middle of the base surface, and the top ends of the four moving blocks are slidably connected in the strip groove.

[0009] By incorporating a synchronous moving mechanism, the forward and reverse motors drive two lead screws to rotate, causing two sets of moving blocks to move towards each other on the two lead screws. This, in turn, drives two sets of fixed plates to move towards each other through the sleeve and telescopic columns, until the two sets of fixed plates fix both ends of the BOPP film. This allows for the simultaneous fixing of both ends of the BOPP film, saving time and effort. Furthermore, since the two ends of the BOPP film are fixed while hanging downwards, it ensures that the film is in a taut state, facilitating subsequent tensile testing.

[0010] In a preferred embodiment, the inner walls of the opposite sides of the through groove are provided with sliding grooves, and the top ends of the four telescopic columns are horizontally connected with sliding rods, with the two ends of the sliding rods slidably connected to the inside of the two sliding grooves respectively.

[0011] The sliding rod slides in the sliding groove, allowing the telescopic column to slide left and right, but the telescopic column cannot move up and down relative to the lifting plate. When the lifting plate moves down, the telescopic column moves downward and retracts into the sleeve column.

[0012] In a preferred embodiment, the bottom ends of both columns are welded to the top of the base, the second electrical connector is located above the first electrical connector, a controller and a buzzer are installed at one corner of the top of the base, and the second electrical connector and the first electrical connector are electrically connected to the controller.

[0013] Equipped with a controller and a buzzer, the controller detects when the first and second electrical connectors separate and activates the buzzer to alert staff that the BOPP film has deformed, eliminating the need for manual visual inspection to determine if the film is stretched. Simultaneously, the controller stops the hydraulic telescopic rod, at which point the count on the tension gauge is the limit tension value at the moment of deformation, making tension detection more accurate.

[0014] In a preferred embodiment, the tension mechanism includes a hydraulic telescopic rod and a tension gauge. The hydraulic telescopic rod is vertically fixed at the center of the top of the base. A pulling plate is horizontally fixed at the top of the telescopic end of the hydraulic telescopic rod. A hanging ring is welded to the top of the pulling plate. A horizontal bar is horizontally welded to the middle of the through groove. The top of the tension gauge is hung on the horizontal bar, and the bottom of the tension gauge is hung on the hanging ring. A limiting plate is welded on the horizontal bar. Two limiting plates are provided and are located on both sides of the top of the tension gauge.

[0015] By incorporating a tension mechanism, activating the hydraulic telescopic rod causes its telescopic end to move downwards, generating a downward pulling force on the pulling plate, which in turn generates a downward pulling force on the lifting plate. This, in turn, generates a downward pulling force on the end of the BOPP film through the fixed plate. The tension gauge counts the combined tension force on both ends of the BOPP film, making the tension testing process for the BOPP film relatively simple.

[0016] A method for using a tensile testing device for BOPP film production includes the following specific steps:

[0017] S1: Lay the BOPP film to be tested flat in the middle on the top of the arc-shaped block, with both ends hanging down;

[0018] S2: Start the forward and reverse motors to drive the two lead screws to rotate, so that the two sets of moving blocks move towards each other on the two lead screws. Then, through the sleeve column and telescopic column, the two sets of fixed plates move towards each other until the two sets of fixed plates fix the two ends of the BOPP film respectively.

[0019] S3: After the end is fixed, start the hydraulic telescopic rod to move its telescopic end downward, which will generate a downward pulling force on the pulling plate, and then a downward pulling force on the lifting plate, which in turn generates a downward pulling force on the end of the BOPP film through the fixing plate.

[0020] S4: The tensile tester counts the tensile force exerted on both ends of the BOPP film.

[0021] S5: When the end of the BOPP film is subjected to tension and does not deform, the lifting plate does not move. When deformation occurs, the lifting plate moves downward, which in turn drives the first electrical connector to move downward and separate from the second electrical connector.

[0022] S6: When the controller detects that the first electrical connector and the second electrical connector are separated, the controller controls the hydraulic telescopic rod to stop working and controls the buzzer to sound.

[0023] S7: Set the count on the tensile tester to the limit tensile force value at the moment of deformation. The staff reads the value, and half of the reading is the limit tensile force that the BOPP film can withstand.

[0024] As can be seen from the above, the tensile testing equipment and its method for BOPP film production provided by the present invention can simultaneously fix both ends of the BOPP film, saving time and effort. Moreover, since the two ends of the BOPP film are fixed in a downward hanging state, it can ensure that the film is in a taut state, which is convenient for subsequent tensile testing. It can also remind the staff that the BOPP film has been deformed, eliminating the need for manual visual judgment of whether the film is stretched. At this time, the count on the tensile tester is the limit tensile value when the deformation just occurred, making the tensile testing more accurate. The tensile testing steps are also relatively simple. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the tensile testing equipment for BOPP film production and its usage method proposed in this invention.

[0026] Figure 2 This is a bottom view of a tensile testing device for BOPP film production and its usage method proposed in this invention.

[0027] Figure 3 This is a schematic diagram of the top of the lifting plate of a tensile testing device for BOPP film production and its usage method proposed in this invention.

[0028] Figure 4 This is a schematic diagram of the top of the base of a tensile testing device for BOPP film production and its usage method proposed in this invention.

[0029] Figure 5 This is a schematic diagram of the internal structure of the base of a tensile testing device for BOPP film production and its usage method proposed in this invention.

[0030] In the attached diagram: 1. Lifting plate; 2. Base; 3. Forward and reverse motor; 4. Controller; 5. Buzzer; 6. Column; 7. Fixing plate; 8. Arc-shaped block; 9. Force gauge; 10. Telescopic column; 11. Sleeve column; 12. Hydraulic telescopic rod; 13. Pulling plate; 14. First electrical connector; 15. Second electrical connector; 16. Through groove; 17. Sliding groove; 18. Crossbar; 19. Sliding rod; 20. Strip groove; 21. Limiting plate; 22. Hanging ring; 23. Moving block; 24. Lead screw; 25. Spring. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Reference Figure 1-5A tensile testing device for BOPP film production includes a lifting plate 1 and a base 2. The lifting plate 1 has a through groove 16 in the middle, and four telescopic columns 10 are slidably connected in the through groove 16. The telescopic columns 10 are provided and are vertically arranged. The top of each of the four telescopic columns 10 is welded with a fixing plate 7. The bottom of each of the four telescopic columns 10 is provided with a sleeve column 11. The bottom of the telescopic column 10 and the bottom of the sleeve column 11 are vertically welded together with the same spring 25. The spring 25 provides a rebound force to the telescopic column 10 so that it cannot continue to move into the sleeve column 11 without the action of external force. The base 2 is provided with a synchronous moving mechanism for the four sleeve columns 11 to move synchronously. An arc-shaped block 8 is horizontally arranged directly above the lifting plate 1. The bottom ends of the arc-shaped block 8 are vertically welded with columns 6. A second electrical connector 15 is installed in the middle of one of the columns 6. A first electrical connector 14 is installed in the middle of one side of the lifting plate 1. A tensile mechanism is provided at the center of the top of the base 2.

[0033] Reference Figure 1 and Figure 2 In a preferred embodiment, the lifting plate 1 is located directly above the base 2, and the four fixed plates 7 are slidably connected to the top of the lifting plate 1. The telescopic column 10 is inserted into the sleeve column 11 and slidably connected to the sleeve column 11.

[0034] Reference Figure 1 and Figure 5 In a preferred embodiment, the synchronous movement mechanism includes a forward and reverse motor 3 and a lead screw 24. The forward and reverse motor 3 is horizontally fixedly installed in the middle of one side of the outer side of the base 2. There are two lead screws 24, and the two lead screws 24 are horizontally welded together. The two lead screws 24 are horizontally rotatably connected to the middle of the interior of the base 2. One end of one of the lead screws 24 passes through one side of the base 2 and is fixedly connected to the output shaft of the forward and reverse motor 3.

[0035] Reference Figure 1 and Figure 5 In a preferred embodiment, each end of the two lead screws 24 is fitted with a movable block 23, and the four movable blocks 23 are connected to the two lead screws 24 by threads. The threads at both ends of the two lead screws 24 are in opposite directions. The top ends of the four movable blocks 23 are welded to the bottom ends of the four sleeves 11 respectively. A strip groove 20 is provided in the middle of the surface of the base 2, and the top ends of the four movable blocks 23 are slidably connected in the strip groove 20.

[0036] The forward and reverse motor 3 is started, which drives the two lead screws 24 to rotate. This causes the two sets of moving blocks 23 to move towards each other on the two lead screws 24. Then, through the sleeve column 11 and the telescopic column 10, the two sets of fixing plates 7 move towards each other until the two sets of fixing plates 7 fix the two ends of the BOPP film respectively. This allows the two ends of the BOPP film to be fixed at the same time, saving time and effort. Moreover, the two ends of the BOPP film are fixed in a downward hanging state, which can ensure that the film is in a taut state, which is convenient for subsequent tensile testing.

[0037] Reference Figure 3 In a preferred embodiment, the inner walls of the through groove 16 on both opposite sides are provided with sliding grooves 17, and the top ends of the four telescopic columns 10 are horizontally penetrated by sliding rods 19, with the two ends of the sliding rods 19 slidably connected to the interiors of the two sliding grooves 17 respectively. The sliding rods 19 slide within the sliding grooves 17, allowing the telescopic columns 10 to slide left and right, but the telescopic columns 10 cannot move up and down relative to the lifting plate 1. When the lifting plate 1 moves down, the telescopic columns 10 move downward and retract into the sleeve column 11.

[0038] Reference Figure 3 In a preferred embodiment, the bottom ends of both columns 6 are welded to the top of the base 2. The second electrical connector 15 is located above the first electrical connector 14. A controller 4 and a buzzer 5 are installed at one corner of the top of the base 2. The second electrical connector 15 and the first electrical connector 14 are electrically connected to the controller 4. When the controller 4 detects that the first electrical connector 14 and the second electrical connector 15 have separated, the controller 4 controls the buzzer 5 to sound, thereby reminding the staff that the BOPP film has deformed, eliminating the need for manual visual judgment of whether the film has stretched. At the same time, the controller 4 controls the hydraulic telescopic rod 12 to stop working. At this time, the count on the tension gauge 9 is the limit tension value when the deformation just occurred, making the tension detection more accurate.

[0039] Reference Figure 4 In a preferred embodiment, the tension mechanism includes a hydraulic telescopic rod 12 and a tension gauge 9. The hydraulic telescopic rod 12 is vertically fixed at the top center of the base 2, and a pulling plate 13 is horizontally fixed at the top of the telescopic end of the hydraulic telescopic rod 12.

[0040] Reference Figure 4 In a preferred embodiment, a hanging ring 22 is welded to the top of the pull plate 13, a horizontal bar 18 is horizontally welded to the middle of the through groove 16, the top of the tension gauge 9 is hung on the horizontal bar 18, and the bottom of the tension gauge 9 is hung on the hanging ring 22.

[0041] Reference Figure 4 In a preferred embodiment, a limiting plate 21 is welded onto the crossbar 18. Two limiting plates 21 are provided and are located on both sides of the top of the tension gauge 9, respectively.

[0042] When the hydraulic telescopic rod 12 is activated and its telescopic end moves downward, a downward pulling force is generated on the pulling plate 13, which in turn generates a downward pulling force on the lifting plate 1. This, in turn, generates a downward pulling force on the end of the BOPP film through the fixing plate 7. The tension gauge 9 counts the tension force that is applied to both ends of the BOPP film. The tension detection procedure for the BOPP film is relatively simple.

[0043] A method for using a tensile testing device for BOPP film production includes the following specific steps:

[0044] S1: Lay the BOPP film to be tested flat in the middle on the top of the arc-shaped block, with both ends hanging down;

[0045] S2: Start the forward and reverse motors to drive the two lead screws to rotate, so that the two sets of moving blocks move towards each other on the two lead screws. Then, through the sleeve column and telescopic column, the two sets of fixed plates move towards each other until the two sets of fixed plates fix the two ends of the BOPP film respectively.

[0046] S3: After the end is fixed, start the hydraulic telescopic rod to move its telescopic end downward, which will generate a downward pulling force on the pulling plate, and then a downward pulling force on the lifting plate, which in turn generates a downward pulling force on the end of the BOPP film through the fixing plate.

[0047] S4: The tensile tester counts the tensile force exerted on both ends of the BOPP film.

[0048] S5: When the end of the BOPP film is subjected to tension and does not deform, the lifting plate does not move. When deformation occurs, the lifting plate moves downward, which in turn drives the first electrical connector to move downward and separate from the second electrical connector.

[0049] S6: When the controller detects that the first electrical connector and the second electrical connector are separated, the controller controls the hydraulic telescopic rod to stop working and controls the buzzer to sound.

[0050] S7: Set the count on the tensile tester to the limit tensile force value at the moment of deformation. The staff reads the value, and half of the reading is the limit tensile force that the BOPP film can withstand.

[0051] It can fix both ends of the BOPP film at the same time, saving time and effort. Since the two ends of the BOPP film are fixed while hanging downwards, it can ensure that the film is in a taut state, which is convenient for subsequent tensile testing. It can also remind the staff that the BOPP film has been deformed, eliminating the need for manual visual judgment of whether the film is stretched. At this time, the count on the tensile tester 9 is the limit tensile value when the deformation just occurred, making the tensile testing more accurate. The tensile testing steps are also relatively simple.

[0052] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A tensile testing device for BOPP film production, comprising a lifting plate (1) and a base (2), characterized in that, The lifting plate (1) has a through groove (16) in the middle, and a telescopic column (10) is slidably connected in the through groove (16). There are four telescopic columns (10) arranged vertically, and a fixing plate (7) is welded to the top of each of the four telescopic columns (10). A sleeve column (11) is provided at the bottom of each of the four telescopic columns (10). The same spring (25) is vertically welded between the bottom of the telescopic column (10) and the bottom of the sleeve column (11). The base (2) has four sleeve columns (11) that move synchronously. The synchronous moving mechanism has an arc-shaped block (8) horizontally arranged directly above the lifting plate (1). The bottom ends of the arc-shaped block (8) are vertically welded with columns (6), and a second electrical connector (15) is installed in the middle of one of the columns (6). A first electrical connector (14) is installed in the middle of one side of the lifting plate (1). The second electrical connector (15) is located above the first electrical connector (14). The second electrical connector (15) and the first electrical connector (14) are electrically connected to the controller (4). The base (2) is provided with a tension mechanism at the top center. The tension mechanism includes a hydraulic telescopic rod (12) and a tension gauge (9). The hydraulic telescopic rod (12) is vertically fixed at the top center of the base (2). A pulling plate (13) is horizontally fixed at the top of the telescopic end of the hydraulic telescopic rod (12). A hanging ring (22) is welded to the top of the pulling plate (13). A horizontal bar (18) is horizontally welded to the middle of the through groove (16). The top of the tension gauge (9) is hung on the horizontal bar (18), and the bottom of the tension gauge (9) is hung on the hanging ring (22). The synchronous moving mechanism includes a forward and reverse motor (3) and a lead screw (24). The forward and reverse motor (3) is horizontally fixedly installed in the middle of one side of the base (2). There are two lead screws (24), and the two lead screws (24) are horizontally welded together. The two lead screws (24) are horizontally rotatably connected to the middle of the inside of the base (2). One end of one of the lead screws (24) passes through one side of the base (2) and is fixedly connected to the output shaft of the forward and reverse motor (3). Both ends of the two lead screws (24) are fitted with moving blocks (23). The four moving blocks (23) are connected to the two lead screws (24) by threads. The thread directions of the two ends of the two lead screws (24) are opposite. The tops of the four moving blocks (23) are respectively welded to the bottoms of the four sleeves (11). A strip groove (20) is opened in the middle of the surface of the base (2). The tops of the four moving blocks (23) are slidably connected in the strip groove (20).

2. The tensile testing equipment for BOPP film production according to claim 1, characterized in that, The lifting plate (1) is located directly above the base (2), and the four fixed plates (7) are slidably connected to the top of the lifting plate (1). The telescopic column (10) is inserted into the sleeve column (11) and slidably connected to the sleeve column (11).

3. The tensile testing equipment for BOPP film production according to claim 1, characterized in that, The through groove (16) has sliding grooves (17) on both sides of its inner wall. The top of each of the four telescopic columns (10) has a sliding rod (19) that runs horizontally through it. The two ends of the sliding rod (19) are slidably connected to the inside of the two sliding grooves (17).

4. The tensile testing equipment for BOPP film production according to claim 1, characterized in that, The bottom ends of the two columns (6) are welded to the top of the base (2), and a controller (4) and a buzzer (5) are installed at one corner of the top of the base (2).

5. The tensile testing equipment for BOPP film production according to claim 1, characterized in that, Limiting discs (21) are welded onto the crossbar (18), and there are two limiting discs (21) located on the top two sides of the tension gauge (9).

6. A method of using a tensile testing device for BOPP film production, characterized in that, The operation of the tensile testing equipment for BOPP film production as described in any one of claims 1-5 includes the following specific steps: S1: Lay the BOPP film to be tested flat in the middle on the top of the arc-shaped block, with both ends hanging down; S2: Start the forward and reverse motors to drive the two lead screws to rotate, so that the two sets of moving blocks move towards each other on the two lead screws. Then, through the sleeve column and telescopic column, the two sets of fixed plates move towards each other until the two sets of fixed plates fix the two ends of the BOPP film respectively. S3: After the end is fixed, start the hydraulic telescopic rod to move its telescopic end downward, which will generate a downward pulling force on the pulling plate, and then a downward pulling force on the lifting plate, which in turn generates a downward pulling force on the end of the BOPP film through the fixing plate. S4: The tensile tester counts the tensile force exerted on both ends of the BOPP film. S5: When the end of the BOPP film is subjected to tension and does not deform, the lifting plate does not move. When deformation occurs, the lifting plate moves downward, which in turn drives the first electrical connector to move downward and separate from the second electrical connector. S6: When the controller detects that the first electrical connector and the second electrical connector are separated, the controller controls the hydraulic telescopic rod to stop working and controls the buzzer to sound. S7: Set the count on the tensile tester to the limit tensile force value at the moment of deformation. The staff reads the value, and half of the reading is the limit tensile force that the BOPP film can withstand.

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