Metal strip cutting device

Abstract

The present application relates to the technical field of metal band cutting, and discloses a metal band cutting device, wherein when cutting a mother roll, if the outer diameter of the mother roll is greater than or equal to a preset outer diameter, the detection rod is in a first state and abuts against the metal band of the mother roll along the height direction of the workbench, and the tensioning wheel is always kept above the metal band on the top surface of the workbench along the height direction of the workbench; if the outer diameter of the mother roll is less than the preset outer diameter, the detection rod is switched to a second state, the detection rod stays at a preset height position and does not contact the tail section metal band of the mother roll, the linkage assembly switches the positioning rod to a second limit position, the tensioning wheel moves downward along the height direction of the workbench and keeps applying a preset pressure to the metal band on the top surface of the workbench to tension the metal band, so that the tail section metal band can pass through the circular saw blade smoothly and be cut. Therefore, the metal band cutting device can effectively improve the yield and cutting efficiency when cutting the mother roll.

Description

Technical Field

[0001] This invention relates to the field of metal strip cutting technology, and more particularly to a metal strip cutting device. Background Technology

[0002] Typically, metal strips have a large master roll width and need to be longitudinally cut to a suitable width before processing. Currently, metal strip longitudinal cutting devices in related technologies usually include an unwinding roller structure, a winding roller structure, and a longitudinal cutting structure. The unwinding roller structure is used to output the metal strip, the winding roller structure is used to pull the metal end output by the unwinding roller structure and wind it up, and the longitudinal cutting structure is set between the unwinding roller structure and the winding roller structure to cut the metal strip to a suitable width along the longitudinal direction.

[0003] When the metal strip in the master roll gradually decreases until the tail section detaches from the unwinding roller structure, the end of the metal strip closest to the unwinding roller structure loses its constraint and reverse resistance, and is only pulled by the winding roller structure on one side. The metal strip cannot be tensioned, which causes problems such as slackness and jumping up and down. If the slack and jumping metal strip is cut by the circular saw blade of the longitudinal cutting structure, it is easy to cause problems such as incomplete cutting of the metal strip, curling of the cutting edge, and increased burrs on the cutting edge. Moreover, the slack and wobbling tail section of the metal strip is also easy to scratch and wrap around the circular saw blade, causing the circular saw blade to break teeth or even jamming in the longitudinal cutting structure. At the same time, the unilateral pulling of the tail section of the metal strip by the winding roller structure is also easy to cause the tail section of the metal strip to be stretched and deformed, resulting in a low qualification rate of the tail section of the metal strip. To address this issue, the longitudinal cutting device for metal strip in related technologies is usually equipped with a pressure roller. The pressure roller applies downward pressure to the metal strip throughout the cutting process, allowing the metal strip to remain flat and taut while moving normally. However, the unfolded length of the master roll is usually long, while the tail section of the metal strip accounts for a small proportion. The pressure roller continuously applies downward pressure to the metal strip throughout the cutting process, which can cause severe heat accumulation on the pressure roller itself. In severe cases, this can lead to localized heat deformation of the metal strip, affecting the yield and cutting efficiency of the metal strip. Summary of the Invention

[0004] The purpose of this invention is to provide a metal strip cutting device to solve the above-mentioned problems existing in the longitudinal cutting devices for metal strips in the related art.

[0005] A metal strip cutting device includes a worktable, an unwinding structure, a winding structure, and a longitudinal cutting structure. The unwinding structure includes an unwinding roller rotatably connected to the worktable for outputting the metal strip. The winding structure includes a winding roller rotatably connected to the worktable for winding the cut metal strip. The longitudinal cutting structure includes a circular saw blade rotatably connected to the worktable, the circular saw blade extending partially beyond the top surface of the worktable along its height direction for cutting the metal strip. The metal strip cutting device also includes a tail section tensioning structure, which includes: The detection assembly includes a detection rod that can move along the height direction of the worktable and has a first state and a second state; when the detection rod is in the first state, it abuts against the metal strip wound around the unwinding roller along the height direction of the worktable; when the detection rod is in the second state, it stops at a preset height position along the height direction of the worktable, and the detection rod is spaced above the metal strip wound around the unwinding roller. The system includes a linkage assembly and at least two tensioning assemblies. At least one tensioning assembly is disposed between the unwinding roller and the circular saw blade, and at least one tensioning assembly is disposed between the take-up roller and the circular saw blade, along the length direction of the worktable. Each tensioning assembly includes a positioning rod and a tensioning wheel connected to the positioning rod. The positioning rod is movable along the height direction of the worktable and has a first limit position and a second limit position. When the positioning rod is in the first limit position, the tensioning wheel is positioned above the metal strip on the top surface of the worktable along the height direction of the worktable. When the positioning rod is in the second limit position, the tensioning wheel applies a preset pressure to the metal strip on the top surface of the worktable along the height direction of the worktable to tension the metal strip. The linkage assembly is configured such that when the detection rod switches from the first state to the second state, it can switch the positioning rod from the first limit position to the second limit position.

[0006] As an optional solution for the aforementioned metal strip cutting device, the linkage component includes: The first linkage component is fixedly connected to the detection rod; The second linkage component is slidably connected to the worktable along the length direction of the worktable; When the detection rod is in the first state, the second linkage abuts against the first linkage along the length direction of the worktable, and the positioning rod abuts against the second linkage from top to bottom along the height direction of the worktable and is in the first extreme position; when the detection rod is in the second state, the second linkage passes through the first linkage along the length direction of the worktable, and the positioning rod passes through the second linkage along the height direction of the worktable and moves to the second extreme position.

[0007] As an optional solution for the above-mentioned metal strip cutting device, the linkage component further includes a first elastic element. Along the length direction of the worktable, one end of the first elastic element is fixedly connected to the worktable, and the other end of the first elastic element is fixedly connected to the second linkage element. The elastic restoring force of the first elastic element can drive the second linkage element to pass through the first linkage element along the length direction of the worktable.

[0008] As an alternative to the aforementioned metal strip cutting device, the tensioning assembly further includes a second elastic element. Along the height direction of the worktable, one end of the second elastic element is fixedly connected to the positioning rod, and the other end of the second elastic element is fixedly connected to the worktable. The elastic restoring force of the second elastic element can drive the positioning rod to move from the first extreme position to the second extreme position.

[0009] As an optional solution of the above-mentioned metal strip cutting device, the metal strip cutting device further includes a first limiting member fixedly connected to the worktable. When the detection rod is in the second state, the second linkage member passes through the first linkage member along the length direction of the worktable and abuts against the first limiting member. And / or, the metal strip cutting device further includes a second limiting member fixedly connected to the worktable, and when the positioning rod is in the second extreme position, the positioning rod passes through the second linkage member along the height direction of the worktable and abuts against the second limiting member.

[0010] As an optional solution for the aforementioned metal strip cutting device, the detection component further includes a third elastic element. Along the height direction of the worktable, one end of the third elastic element is fixedly connected to the detection rod, and the other end of the third elastic element is fixedly connected to the worktable. The elastic restoring force of the third elastic element can drive the detection rod to switch from the first state to the second state.

[0011] As an optional solution for the above-mentioned metal strip cutting device, the metal strip cutting device further includes two third limiting members, which are located on both sides of the worktable in a one-to-one correspondence along the length direction of the worktable, and both third limiting members are located between the unwinding roller and the winding roller. Each of the third limiting members is provided with a limiting hole that extends along the length of the worktable, and the metal strip can pass through the limiting hole and contact the inner top wall of the limiting hole and the top surface of the worktable.

[0012] As an optional embodiment of the aforementioned metal strip cutting device, the tensioning wheel is rotatably connected to the positioning rod around its own central axis; the metal strip cutting device further includes a warning component, which comprises: A warning bell, which is movably connected to the workbench; A cam, which is coaxially arranged with the tension wheel, is used to strike the warning bell.

[0013] As an optional embodiment of the aforementioned metal strip cutting device, the winding structure further includes a first rotary drive component, which is fixedly connected to the worktable and drivenly connected to the winding roller; the metal strip cutting device further includes a safety component, which is located between the circular saw blade and the winding roller along the length direction of the worktable, and the safety component includes: A switch button is fixedly connected to the worktable and is spaced apart along the height direction of the worktable on the top surface of the worktable. The switch button is electrically connected to the first rotary drive component and is used to start and stop the first rotary drive component. The top rod and the fourth elastic element are provided. The top rod slides through the worktable along the height direction of the worktable. The fourth elastic element is configured to drive the top rod to abut against the metal strip on the top surface of the worktable from bottom to top along the height direction of the worktable, and to drive the top rod to abut against the switch button from bottom to top along the height direction of the worktable.

[0014] As an optional solution for the above-mentioned metal strip cutting device, the tensioning component includes two positioning rods, and the number of the detection component and the linkage component are both two, with the two detection components, the two linkage components and the two positioning rods of the tensioning component being set in a one-to-one correspondence; Along the width direction of the worktable, the two positioning rods are located on both sides of the metal strip on the top surface of the worktable, and the tensioning wheel of the tensioning assembly is located between the two positioning rods.

[0015] Beneficial effects: When cutting the master roll using this metal strip cutting device, the master roll is first installed on the unwinding roller. At this time, the detection rod switches to the first state and abuts against the metal strip of the master roll along the height direction of the worktable. Then, the metal strip of the master roll is pulled out to the circular saw blade for cutting. Then, the cut metal strip is wound onto the take-up roller, and then the take-up roller is driven to continuously output the winding traction force, so that the cut metal strip is continuously wound onto the take-up roller. During this process, the outer diameter of the master roll gradually decreases, and the detection rod is always abutting against the metal strip of the master roll along the height direction of the worktable. The positioning rod is always in the first limit position, and the tensioning wheel is always positioned above the metal strip on the top surface of the worktable along the height direction of the worktable. This effectively avoids the serious heat accumulation of the pressure roller itself caused by the pressure roller continuously applying downward pressure to the metal strip during the entire cutting process, which is common in related technologies. This effectively improves the yield and the efficiency of cutting metal strip.

[0016] When the outer diameter of the mother roll decreases to the preset outer diameter, the mother roll enters the tail section. At this time, the detection rod switches from the first state to the second state. The detection rod stops at the preset height position along the height direction of the worktable. The detection rod is positioned above the mother roll and does not contact the tail section metal strip of the mother roll. At the same time, the linkage component switches the positioning rod to the second limit position. The tensioning wheel moves downward along the height direction of the worktable and applies a preset pressure to the metal strip on the top surface of the worktable to make the metal strip taut. This allows the tail section metal strip to pass smoothly through the circular saw blade for cutting. This effectively avoids problems such as incomplete cutting of the metal strip, curling of the cutting edge, increased burrs on the cutting edge, and metal strip scraping and wrapping around the circular saw blade caused by unilateral traction in related technologies, thereby further improving the yield. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the metal strip cutting device from a first perspective in an embodiment of the present invention; Figure 2 This is a schematic diagram of the metal strip cutting device from a second perspective in an embodiment of the present invention; Figure 3 This is a schematic diagram of the first part of the structure of the metal strip cutting device in an embodiment of the present invention; Figure 4 This is a schematic diagram of the second part of the metal strip cutting device in an embodiment of the present invention; Figure 5 for Figure 1 A partial view at point A; Figure 6 for Figure 3 A partial view at point B; Figure 7 for Figure 4 A partial view at point C; Figure 8 for Figure 2 A partial view at point D; Figure 9 This is a partially exploded view of the metal strip cutting device in an embodiment of the present invention.

[0018] In the picture: 100. Master roll; 110. Metal strip; 1. Workbench; 2. Rewinding structure; 21. Rewinding roller; 22. First rotary drive component; 23. Third rotating shaft; 3. Longitudinal cutting structure; 31. Circular saw blade; 32. Second rotary drive component; 4. Detection assembly; 41. Detection rod; 42. Third elastic element; 5. Linkage assembly; 51. First linkage component; 511. First through hole; 52. Second linkage component; 521. Second through hole; 53. First elastic component; 6. Tensioning assembly; 61. Positioning rod; 62. Tensioning wheel; 63. Second elastic element; 64. Connecting element; 65. First rotating shaft; 71. First limiting component; 72. Second limiting component; 721. Clearance hole; 73. Third limiting component; 8. Warning component; 81. Warning bell; 82. Cam; 9. Safety component; 91. Switch button; 92. Push rod; 921. Limiting part; 93. Fourth elastic element; 94. Fourth limiting element; 10. First bracket; 101. Second guide hole; 11. Second support. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] This invention provides a metal strip cutting device, such as... Figures 1 to 3 , Figure 9 As shown, the metal strip cutting device includes a worktable 1, an unwinding structure, a winding structure 2, and a longitudinal cutting structure 3. The unwinding structure includes an unwinding roller rotatably connected to the worktable 1, which is used to output the metal strip 110. The winding structure 2 includes a winding roller 21 rotatably connected to the worktable 1, which is used to wind up the cut metal strip 110. The longitudinal cutting structure 3 includes a circular saw blade 31 rotatably connected to the worktable 1, which extends partially along the height direction of the worktable 1 from the top surface of the worktable 1 for cutting the metal strip 110.

[0024] Among them, such as Figures 1 to 7 , Figure 9As shown, the metal strip cutting device also includes a tail section tensioning structure, which includes a detection component 4, a linkage component 5, and at least two tensioning components 6. The detection component 4 includes a detection rod 41 that can move along the height direction of the worktable 1 and has a first state and a second state. When the detection rod 41 is in the first state, it abuts against the metal strip 110 wound around the unwinding roller along the height direction of the worktable 1. When the detection rod 41 is in the second state, it stops at a preset height position along the height direction of the worktable 1, and the detection rod 41 is spaced above the metal strip 110 wound around the unwinding roller. Along the length direction of the worktable 1, at least one tensioning component 6 is provided between the unwinding roller and the circular saw blade 31, and at least one tensioning component 6 is provided between the take-up roller 21 and the circular saw blade 31. The tensioning assembly 6 includes a positioning rod 61 and a tensioning wheel 62 connected to the positioning rod 61. The positioning rod 61 can move along the height direction of the worktable 1 and has a first limit position and a second limit position. When the positioning rod 61 is in the first limit position, the tensioning wheel 62 is positioned above the metal strip 110 on the top surface of the worktable 1 along the height direction of the worktable 1. When the positioning rod 61 is in the second limit position, the tensioning wheel 62 applies a preset pressure to the metal strip 110 on the top surface of the worktable 1 along the height direction of the worktable 1 to tension the metal strip 110. The linkage assembly 5 is configured to switch the positioning rod 61 from the first limit position to the second limit position when the detection rod 41 switches from the first state to the second state.

[0025] When cutting the master roll 100, the master roll 100 is first fitted onto the unwinding roller. At this time, the detection rod 41 switches to the first state and abuts against the metal strip 110 of the master roll 100 along the height direction of the worktable 1. Then, the metal strip 110 of the master roll 100 is pulled out to the circular saw blade 31 for cutting. Then, the cut metal strip 110 is wound onto the take-up roller 21. Then, the take-up roller 21 is driven to continuously output the take-up traction force, so that the cut metal strip 110 is continuously wound onto the take-up roller 21. It can be understood that during this process, the master roll 100... The outer diameter of the 0 gradually decreases and the detection rod 41 always abuts against the metal strip 110 of the master roll 100 along the height direction of the worktable 1. The positioning rod 61 is always in the first limit position, and the tensioning wheel 62 is always positioned above the metal strip 110 on the top surface of the worktable 1 along the height direction of the worktable 1. This effectively avoids the serious heat accumulation of the pressure roller itself due to the continuous downward pressure applied to the metal strip 110 during the entire cutting process, which is common in related technologies. This effectively improves the yield and the efficiency of cutting the metal strip 110.

[0026] When the outer diameter of the master roll 100 decreases to the preset outer diameter, the master roll 100 enters the tail section. At this time, the detection rod 41 switches from the first state to the second state. The detection rod 41 stops at the preset height position along the height direction of the worktable 1. The detection rod 41 is spaced above the master roll 100. The detection rod 41 does not contact the tail section metal strip 110 of the master roll 100. At the same time, the linkage component 5 switches the positioning rod 61 to the second limit position. The tensioning wheel 62 moves downward along the height direction of the worktable 1 and applies a preset pressure to the metal strip 110 on the top surface of the worktable 1 to make the metal strip 110 taut. This allows the tail section metal strip 110 to pass smoothly through the circular saw blade 31 and be cut. This can effectively avoid the problems of incomplete cutting of the metal strip 110, curling of the cutting edge, increased burrs on the cutting edge, and scraping and wrapping of the metal strip 110 onto the circular saw blade 31 caused by unilateral traction in the related technology. This can further improve the yield.

[0027] In summary, using this metal strip cutting device to cut the master roll 100 can effectively improve the yield and cutting efficiency.

[0028] The preset height position, preset pressure, and preset outer diameter are all empirical values ​​obtained from a large number of previous tests, and their sizes can be adjusted according to actual working conditions.

[0029] Specifically, in this embodiment, as Figure 1 As shown, the exemplary configuration uses three tensioning components 6. It can be understood that the number of tensioning components 6 can be adaptively increased or decreased depending on the length of the worktable 1.

[0030] Optionally, in this embodiment, as Figures 1 to 7 As shown, the linkage assembly 5 includes a first linkage member 51 and a second linkage member 52; the first linkage member 51 is fixedly connected to the detection rod 41; the second linkage member 52 is slidably connected to the worktable 1 along the length direction of the worktable 1; when the detection rod 41 is in the first state, the second linkage member 52 abuts against the first linkage member 51 along the length direction of the worktable 1, and the positioning rod 61 abuts against the second linkage member 52 from top to bottom along the height direction of the worktable 1 and is in the first extreme position; when the detection rod 41 is in the second state, the second linkage member 52 passes through the first linkage member 51 along the length direction of the worktable 1, and the positioning rod 61 passes through the second linkage member 52 along the height direction of the worktable 1 and moves to the second extreme position.

[0031] This configuration ensures that when the detection rod 41 switches from the first state to the second state, the linkage component 5 switches the positioning rod 61 from the first extreme position to the second extreme position, so that the tensioning wheel 62 applies a preset pressure to the metal strip 110 on the top surface of the workbench 1 along the height direction of the workbench 1, thus tensioning the metal strip 110. This allows the tail section of the metal strip 110 to pass smoothly through the circular saw blade 31 and be cut, thereby improving the yield rate. Secondly, this configuration avoids additional energy consumption, and the tensioning wheel 62 can respond in time to tension the metal strip 110.

[0032] Specifically, in this embodiment, as Figures 1 to 7 As shown, the first linkage 51 is provided with a first through hole 511, and the second linkage 52 is provided with at least two second through holes 521. The at least two second through holes 521 are provided in a one-to-one correspondence with the positioning rods 61 of the at least two tensioning components 6. When the detection rod 41 is in the second state, the second linkage 52 passes through the first through hole 511 along the length direction of the worktable 1, and the positioning rod 61 moves to the second limit position by passing through the second through hole 521 along the height direction of the worktable 1.

[0033] In other embodiments, the linkage component 5 may include a position sensor and a first lifting drive. The position sensor monitors the movement of the detection rod 41 along the height direction of the worktable 1 to a preset height position. The first lifting drive is connected to the positioning rod 61 for driving the positioning rod 61 to move up and down along the height direction. This also enables the positioning rod 61 to switch from a first extreme position to a second extreme position.

[0034] Further, optionally, in this embodiment, as Figure 5 As shown, the linkage component 5 also includes a first elastic element 53. Along the length direction of the worktable 1, one end of the first elastic element 53 is fixedly connected to the worktable 1, and the other end of the first elastic element 53 is fixedly connected to the second linkage element 52. The elastic restoring force of the first elastic element 53 can drive the second linkage element 52 to pass through the first linkage element 51 along the length direction of the worktable 1.

[0035] This configuration allows the second linkage 52 to directly pass through the first linkage 51 along the length of the worktable 1 under the elastic restoring force of the first elastic member 53 when the detection rod 41 switches from the first state to the second state. This improves the response efficiency of the second linkage 52 and avoids additional energy consumption.

[0036] Specifically, in this embodiment, the first elastic element 53 is a tension spring.

[0037] In other embodiments, the linkage component 5 may also include a horizontal drive member, which is connected to the second linkage member 52 for driving the second linkage member 52 to move along the length of the worktable 1. Alternatively, the second linkage member 52 can be driven to pass through the first linkage member 51 along the length of the worktable 1.

[0038] In other embodiments, a first handle may also be provided on the second linkage 52, and the second linkage 52 may be pushed or pulled by human force along the horizontal direction of the workbench 1.

[0039] Further, optionally, in this embodiment, as Figure 4 and Figure 7 As shown, the tensioning assembly 6 also includes a second elastic element 63. Along the height direction of the worktable 1, one end of the second elastic element 63 is fixedly connected to the positioning rod 61, and the other end of the second elastic element 63 is fixedly connected to the worktable 1. The elastic restoring force of the second elastic element 63 can drive the positioning rod 61 to move from the first limit position to the second limit position.

[0040] With this configuration, the positioning rod 61 can be directly switched from the first extreme position to the second extreme position under the elastic restoring force of the second elastic element 63, which can improve the response efficiency of the positioning rod 61 and avoid causing additional energy consumption.

[0041] Specifically, in this embodiment, the second elastic element 63 is a tension spring.

[0042] Further, optionally, in this embodiment, as Figures 1 to 3 As shown, the metal strip cutting device also includes a first limiting member 71 fixedly connected to the worktable 1. When the detection rod 41 is in the second state, the second linkage member 52 passes through the first linkage member 51 along the length direction of the worktable 1 and abuts against the first limiting member 71. This arrangement is to prevent the second linkage member 52 from moving excessively along the length direction of the worktable 1, which would prevent the positioning rod 61 from passing through the second linkage member 52 to switch to the second limit position, thereby effectively improving the reliability of the metal strip cutting device in cutting the tail section of the metal strip 110.

[0043] Further, optionally, in this embodiment, as Figures 1 to 4 ,picture, Figure 7 As shown, the metal strip cutting device also includes a second limiting member 72 fixedly connected to the worktable 1. When the positioning rod 61 is in the second extreme position, the positioning rod 61 passes through the second linkage member 52 along the height direction of the worktable 1 and abuts against the second limiting member 72. This arrangement ensures that the positioning rod 61 can be effectively maintained in the second extreme position after switching to it, thereby ensuring that the tensioning wheel 62 continuously applies a preset pressure to the metal strip 110 on the top surface of the worktable 1 along the height direction of the worktable 1 to keep the metal strip 110 tensioned.

[0044] Optionally, in this embodiment, the second limiting member 72 is provided with a first guide hole extending along the length direction of the worktable 1, and the second linkage member 52 is slidably disposed in the first guide hole. This allows the second linkage member 52 to be guided to move stably and reliably along the length direction of the worktable 1, thereby further improving the reliability of the metal strip cutting device in cutting the tail section of the metal strip 110; secondly, this arrangement also improves the integration and aesthetics of the metal strip cutting device.

[0045] Further, optionally, in this embodiment, such as Figure 4 and Figure 6 As shown, the tensioning assembly 6 also includes a connector 64, which is slidably connected to the second limiting member 72 along the height direction of the worktable 1 and fixedly connected to the positioning rod 61. The tensioning wheel 62 is connected to the connector 64. This allows the tensioning wheel 62 to be connected to the positioning rod 61 and guides it to move only along the height direction of the worktable 1. This further improves the reliability of the metal strip cutting device in cutting the tail section of the metal strip 110.

[0046] Further, optionally, in this embodiment, such as Figure 4 and Figure 6 As shown, the connector 64 is at least partially housed within the second limiting member 72. The second elastic member 63 is housed within the second limiting member 72, with one end of the second elastic member 63 fixedly connected to the positioning rod 61 and the other end of the second elastic member 63 fixedly connected to the second limiting member 72. This improves the integration and aesthetics of the tensioning assembly 6. It is understood that the positioning rod 61 is partially located within the second limiting member 72.

[0047] Optionally, in this embodiment, as Figure 4 and Figure 6 As shown, the detection assembly 4 also includes a third elastic element 42. Along the height direction of the worktable 1, one end of the third elastic element 42 is fixedly connected to the detection rod 41, and the other end of the third elastic element 42 is fixedly connected to the worktable 1. The elastic restoring force of the third elastic element 42 can drive the detection rod 41 to switch from the first state to the second state.

[0048] With this configuration, when the detection rod 41 is in the first state, it can reliably abut against the metal strip 110 of the master roll 100 along the height direction of the workbench 1; secondly, the elastic restoring force of the third elastic member 42 can switch the detection rod 41 from the first state to the second state and keep it in the second state, so that the second linkage member 52 can effectively pass through the first linkage member 51.

[0049] Specifically, in this embodiment, the third elastic element 42 is a tension spring.

[0050] In other embodiments, the detection assembly 4 may also include a second lifting drive component, which is connected to the detection rod 41 for driving the detection rod 41 to move along the height direction of the worktable 1. This also enables the detection rod 41 to reliably abut against the metal strip 110 of the master roll 100 along the height direction of the worktable 1, and allows the detection rod 41 to be switched from the first state to the second state and then held in the second state.

[0051] In other embodiments, a second handle may be provided on the detection rod 41. When the detection rod 41 moves to a preset height position along the height direction of the workbench 1, a downward pressure is applied to the detection rod 41 by human force along the height direction of the workbench 1 so that the detection rod 41 is kept in the second state.

[0052] Further optional, such as Figures 1 to 3 As shown, the metal strip cutting device also includes two first supports 10, which are located on both sides of the worktable 1 along the width direction of the worktable 1. The unwinding roller is rotatably connected to the two first supports 10 around its own central axis. At least one first support 10 is detachably connected to the worktable 1. At least one first support 10 is equipped with a detection component 4; a detection rod 41 is slidably connected to the first support 10 along the height direction of the worktable 1. A first limiting member 71 is fixedly connected to the first support 10.

[0053] This configuration allows the unwinding roller to be rotatably connected to the worktable 1, and the detection rod 41 to be slidably connected to the worktable 1 along its height direction. Furthermore, at least one first bracket 10 is detachably connected to the worktable 1 to facilitate the installation of the mother roll 100 onto the unwinding roller. The detachable connection methods include, but are not limited to, screw connections and bolt connections.

[0054] Alternatively, in this embodiment, a damping layer is provided at the rotatable connection between the unwinding roller and the first support 10, so as to provide unwinding resistance to the master roll 100.

[0055] Further, optionally, in this embodiment, as Figure 3 As shown, the first support 10 is also provided with a second guide hole 101 extending along the width direction of the worktable 1, and the length direction of the second guide hole 101 is parallel to the height direction of the worktable 1. The first linkage 51 passes through the second guide hole 101 and is fixedly connected to the detection rod 41. This arrangement can limit the stable lifting and lowering of the first linkage 51 along the height direction of the worktable 1, thereby further improving the reliability of the lifting and lowering of the detection rod 41 along the height direction of the worktable 1.

[0056] Further, optionally, in this embodiment, as Figures 1 to 3As shown, there are two detection components 4 and two linkage components 5, with each of the two detection components 4, two linkage components 5, and two first supports 10 arranged in a one-to-one correspondence. This further improves the reliability of the metal strip cutting device in cutting the tail section of the metal strip 110.

[0057] Further, optionally, in this embodiment, as Figures 1 to 3 As shown, the tensioning assembly 6 includes two positioning rods 61, two detection assemblies 4, two linkage assemblies 5, and the two positioning rods 61 of the tensioning assembly 6 are arranged in a one-to-one correspondence; along the width direction of the worktable 1, the two positioning rods 61 are located on both sides of the metal strip 110 on the top surface of the worktable 1, and the tensioning wheel 62 of the tensioning assembly 6 is located between the two positioning rods 61. This further improves the reliability of the metal strip cutting device in cutting the tail section of the metal strip 110.

[0058] In other embodiments, the number of detection component 4 and / or linkage component 5 may be set to one, depending on the actual working conditions.

[0059] Further optional, such as Figure 3 and Figure 4 As shown, the tensioning assembly 6 has at least two tensioning wheels 62, which are spaced apart along the width direction of the worktable 1. This further improves the reliability of the metal strip cutting device in cutting the tail section of the metal strip 110.

[0060] Optionally, in this embodiment, as Figures 1 to 3 As shown, the metal strip cutting device also includes two third limiting members 73. The two third limiting members 73 are located on both sides of the worktable 1 along the length direction of the worktable 1, and both third limiting members 73 are located between the unwinding roller and the take-up roller 21. Each third limiting member 73 is provided with a limiting hole that runs through the length direction of the worktable 1. The metal strip 110 can pass through the limiting hole and contact the inner top wall of the limiting hole and the top surface of the worktable 1.

[0061] This configuration ensures that the metal strip 110 conveyed to the worktable 1 remains flat on the top surface of the worktable 1 and in contact with the top surface of the worktable 1, thereby further improving the yield rate. It is understood that along the length of the worktable 1, all tensioning components 6 are located between the two third limiting members 73.

[0062] Alternatively, in this embodiment, the metal strip 110 passing through the limiting hole does not contact any of the inner walls of the limiting hole except for the inner top wall, in order to avoid the metal strip 110 being scratched or even grazed.

[0063] Optionally, in this embodiment, as Figure 4 , Figure 6 and Figure 7 As shown, the tensioning wheel 62 is rotatably connected to the positioning rod 61 around its own central axis.

[0064] Further, optionally, in this embodiment, as Figures 1 to 4 , Figure 6 and Figure 7 As shown, the metal strip cutting device also includes a warning component 8, which includes a warning bell 81 and a cam 82; the warning bell 81 is movably connected to the worktable 1; the cam 82 is coaxially arranged with the tension wheel 62 and is used to strike the warning bell 81.

[0065] Specifically, in this embodiment, as Figure 4 , Figure 6 and Figure 7 As shown, the tensioning wheel 62 is rotatably connected to the connector 64 via the first rotating shaft 65.

[0066] During the conveying of the metal strip 110, the tension wheel 62 is driven to rotate around its own central axis, which in turn drives the first rotating shaft 65 to rotate around its own central axis, thereby driving the cam 82 to rotate and strike the warning bell 81 to remind the staff that the master roll 100 has been cut to the end, so that the staff can prepare to disassemble the finished metal strip 110 on the take-up roller 21 and install the next master roll 100 on the unwinding roller.

[0067] Specifically, in this embodiment, as Figure 7 As shown, the second limiting member 72 is provided with a clearance hole 721 that runs through the width direction of the worktable 1. The length direction of the clearance hole 721 is parallel to the height direction of the worktable 1. The first rotating shaft 65 passes through the clearance hole 721 along the width direction of the worktable 1 and is fixedly connected to the cam 82 to ensure that the positioning rod 61 can smoothly switch between the first limit position and the second limit position.

[0068] Among them, such as Figure 1 , Figure 2 and Figure 9 As shown, the winding structure 2 also includes a first rotary drive component 22, which is fixedly connected to the worktable 1 and driven by the winding roller 21. This drives the winding roller 21 to rotate around its own central axis, outputting winding traction force.

[0069] Optionally, in this embodiment, as Figure 2 and Figure 8As shown, the metal strip cutting device also includes a safety component 9, which is located between the circular saw blade 31 and the take-up roller 21 along the length of the workbench 1. The safety component 9 includes a switch button 91, a push rod 92, and a fourth elastic element 93. The switch button 91 is fixedly connected to the workbench 1 and is spaced apart on the top surface of the workbench 1 along the height direction of the workbench 1. The switch button 91 is electrically connected to the first rotary drive 22 and is used to start and stop the first rotary drive 22. The push rod 92 slides through the workbench 1 along the height direction of the workbench 1. The fourth elastic element 93 is configured to drive the push rod 92 to abut against the metal strip 110 on the top surface of the workbench 1 from bottom to top along the height direction of the workbench 1, and to drive the push rod 92 to abut against the switch button 91 from bottom to top along the height direction of the workbench 1.

[0070] When there is a metal strip 110 above the push rod 92, the metal strip 110 restricts the top of the push rod 92 to be flush with the top surface of the worktable 1. During this process, the fourth elastic element 93 is in a compressed state. When there is no metal strip 110 above the push rod 92, it indicates that the tail section of the metal strip 110 is about to be cut to the end. The elastic restoring force of the fourth elastic element 93 drives the push rod 92 to abut against the switch button 91 from bottom to top along the height direction of the worktable 1 and press the switch to control the first rotary drive 22 to stop working. At this time, the take-up roller 21 no longer outputs take-up traction force, thereby avoiding the circular saw blade 31 from continuously cutting the metal strip 110 and causing the end part of the metal strip 110 to be completely cut off. The take-up roller 21 continues to rotate around its own central axis, causing the metal strip 110 wound on the take-up roller 21 to unwind, thereby further improving the reliability of the metal strip cutting device. After the first rotary drive 22 stops working, the uncut portion of the tail metal strip 110 is cut off, and then the finished metal strip 110 on the take-up roller 21 is removed.

[0071] Specifically, in this embodiment, as Figure 8 As shown, the switch button 91 is fixedly connected to the second limiting member 72. This ensures that the switch button 91 is fixedly connected to the worktable 1.

[0072] Specifically, in this embodiment, as Figure 8 As shown, the safety component 9 also includes a fourth limiting member 94 fixedly connected to the worktable 1; the push rod 92 is provided with a limiting part 921, which can abut against the fourth limiting member 94 from top to bottom along the height direction of the worktable 1. This is to prevent the push rod 92 from detaching from the worktable 1 and to improve the reliability of the safety component 9.

[0073] Specifically, in this embodiment, as Figure 8As shown, along the height direction of the worktable 1, one end of the fourth elastic element 93 is fixedly connected to the bottom surface of the worktable 1, and the other end of the fourth elastic element 93 is connected to the limiting part 921, with the fourth elastic element 93 located between the worktable 1 and the limiting part 921. The fourth elastic element 93 is a tension spring.

[0074] Optionally, in this embodiment, as Figure 1 and Figure 2 As shown, the metal strip cutting device also includes two second supports 11, which are located on both sides of the worktable 1 in a one-to-one correspondence along the width direction of the worktable 1. The take-up roller 21 is rotatably connected to the two second supports 11 around its own central axis. At least one second support 11 is detachably connected to the worktable 1. One third limiting member 73 is fixedly connected to the first support 10, and the other third limiting member 73 is fixedly connected to the second support 11.

[0075] This configuration allows the take-up roller 21 to be rotatably connected to the worktable 1. Furthermore, at least one second bracket 11 is detachably connected to the worktable 1 to facilitate the removal of the finished metal strip 110 from the take-up roller 21. The detachable connection methods include, but are not limited to, screw connections and bolt connections.

[0076] Specifically, in this embodiment, the unwinding roller is fitted with a second rotating shaft to prevent self-rotation, and the second rotating shaft is rotatably connected to two first supports 10. The portion of the second rotating shaft that mates with the unwinding roller has a rectangular cross-section along its own axial direction, so that the second rotating shaft limits the rotation of the take-up roller 21. It can be understood that, according to actual working conditions, the cross-sectional shape of the portion of the second rotating shaft that mates with the unwinding roller along its own axial direction can also be adjusted to a non-circular shape such as a square, to ensure that the second rotating shaft limits the rotation of the take-up roller 21 and also allows for easy detachment of the unwinding roller from the second rotating shaft.

[0077] Specifically, such as Figure 9 As shown, the take-up roller 21 is anti-rotationally mounted on the third rotating shaft 23, which is rotatably connected to two second supports 11. In this embodiment, the portion of the third rotating shaft 23 that mates with the take-up roller 21 has a rectangular cross-section along its own axial direction to prevent the take-up roller 21 from rotating. It is understood that the cross-sectional shape of the portion of the third rotating shaft 23 that mates with the take-up roller 21 along its own axial direction can also be adaptively adjusted to a non-circular shape such as a square, depending on the actual working conditions, to ensure that the third rotating shaft 23 prevents the take-up roller 21 from rotating and also allows for easy detachment of the take-up roller 21 from the third rotating shaft 23.

[0078] Among them, such as Figure 2 As shown, the longitudinal cutting structure 3 also includes a second rotary drive 32, which is fixedly connected to the worktable 1 and driven by the circular saw blade 31. This drives the circular saw blade 31 to rotate around its central axis to cut the metal strip 110.

[0079] Optionally, the longitudinal cutting structure 3 has at least two circular saw blades 31, which are spaced apart along the width direction of the worktable 1 and are both connected to the second rotary drive 32. This allows the metal strip 110 to be adaptively cut into at least two pieces along the width direction according to actual working conditions. In this embodiment, as shown... Figure 1 and Figure 2 As shown, the exemplary configuration sets the number of circular saw blades 31 to one.

[0080] Optionally, the take-up roller 21 is divided into at least two take-up roller segments along its own axial direction. Specifically, if the number of circular saw blades 31 is set to M, then the number of take-up roller segments of the take-up roller 21 is (M+1), where M is a positive integer greater than or equal to 1.

[0081] like Figures 1 to 9 As shown, the working principle of this metal strip cutting device is as follows: When cutting the master roll 100, the master roll 100 is first installed on the unwinding roller. The detection rod 41 is pulled up along the height direction of the workbench 1 to switch to the first state and abut against the metal strip 110 of the master roll 100. Then, the metal strip 110 of the master roll 100 is passed through the limiting hole of one of its third limiting members 73, the gap between the tensioning wheel 62 upstream of the circular saw blade 31 and the top surface of the workbench 1, so that the starting end of the metal strip 110 is pulled to the circular saw blade 31 for cutting. Then, the cut metal strip 110 is passed through the gap between the tensioning wheel 62 downstream of the circular saw blade 31 and the top surface of the workbench 1, the limiting hole of another third limiting member 73, and wound up to the take-up roller 21. Then, the first rotary drive member 22 is controlled to drive the take-up roller 21 to continuously output the winding traction force, so that the cut metal strip 110 is continuously wound up to the take-up roller 21. During this process, the outer diameter of the master roll 100 gradually decreases, the detection rod 41 moves downward along the height direction of the workbench 1 and always abuts against the metal strip 110 of the master roll 100, the positioning rod 61 is always in the first limit position, and the tensioning wheel 62 is always positioned above the metal strip 110 on the top surface of the workbench 1 along the height direction of the workbench 1.

[0082] When the outer diameter of the master roll 100 decreases to a preset outer diameter, the master roll 100 enters the tail section. At this time, the detection rod 41 switches from the first state to the second state. Under the elastic restoring force of the third elastic element 42, the detection rod 41 stops at a preset height position along the height direction of the worktable 1. The detection rod 41 is spaced above the master roll 100 and does not contact the tail section metal strip 110 of the master roll 100. At the same time, the second linkage 52 passes through the first linkage 53 along the length direction of the worktable 1 under the elastic restoring force of the first elastic element 53. The first through hole 511 of the moving part 51 abuts against the first limiting part 71. Under the action of the elastic restoring force of the second elastic part 63, the positioning rod 61 passes through the second through hole 521 of the second linkage part 52 along the height direction of the workbench 1 and abuts against the second limiting part 72 to be in the second limit position, so that the tensioning wheel 62 moves downward along the height direction of the workbench 1 and maintains applying a preset pressure to the metal strip 110 on the top surface of the workbench 1 to make the metal strip 110 taut, so that the tail section of the metal strip 110 can be cut flat by the circular saw blade 31.

[0083] After the detection rod 41 switches from the first state to the second state, the metal strip 110 synchronously drives the tension wheel 62 to rotate around its own central axis, so that the first rotating shaft 65 synchronously drives the cam 82 to rotate and strike the warning bell 81, reminding the staff to cut the mother roll 100 to the end, so that the staff can prepare to disassemble the finished metal strip 110 on the take-up roller 21 and install the next mother roll 100 on the unwinding roller.

[0084] During the above process, the metal strip 110 always restricts the top of the push rod 92 to be flush with the top surface of the worktable 1, and the fourth elastic element 93 is in a compressed state. When the tail section of the metal strip 110 is cut to the end so that there is no metal strip 110 above the push rod 92, the elastic restoring force of the fourth elastic element 93 drives the push rod 92 to abut against the switch button 91 from bottom to top along the height direction of the worktable 1 and press the switch to stop the first rotary drive 22 from working. At this time, the take-up roller 21 no longer outputs take-up traction force. After the first rotary drive 22 stops working, the uncut part on the tail section of the metal strip 110 is cut off, and then the finished metal strip 110 on the take-up roller 21 is removed.

[0085] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art should understand that the scope of disclosure involved in the present invention is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalent features without departing from the above-disclosed concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A metal strip cutting device, comprising a worktable (1), an unwinding structure, a winding structure (2), and a longitudinal cutting structure (3), wherein the unwinding structure includes an unwinding roller rotatably connected to the worktable (1) for outputting a metal strip (110), the winding structure (2) includes a winding roller (21) rotatably connected to the worktable (1) for winding the cut metal strip (110), and the longitudinal cutting structure (3) includes a circular saw blade (31) rotatably connected to the worktable (1), wherein the circular saw blade (31) extends partially out of the top surface of the worktable (1) along the height direction for cutting the metal strip (110), characterized in that, The metal strip cutting device further includes a tail section tensioning structure, which includes: The detection assembly (4) includes a detection rod (41) that can move along the height direction of the worktable (1) and has a first state and a second state; when the detection rod (41) is in the first state, it abuts against the metal strip (110) wound around the unwinding roller along the height direction of the worktable (1); when the detection rod (41) is in the second state, it stops at a preset height position along the height direction of the worktable (1), and the detection rod (41) is spaced above the metal strip (110) wound around the unwinding roller; A linkage assembly (5) and at least two tensioning assemblies (6) are provided along the length direction of the worktable (1). At least one tensioning assembly (6) is provided between the unwinding roller and the circular saw blade (31), and at least one tensioning assembly (6) is provided between the winding roller (21) and the circular saw blade (31). The tensioning assembly (6) includes a positioning rod (61) and a tensioning wheel (62) connected to the positioning rod (61). The positioning rod (61) can move along the height direction of the worktable (1) and has a first limit position and a second limit position. The positioning rod (61) is in the first limit position. When the tensioning wheel (62) is positioned above the metal strip (110) on the top surface of the worktable (1) along the height direction of the worktable (1); when the positioning rod (61) is in the second extreme position, the tensioning wheel (62) applies a preset pressure to the metal strip (110) on the top surface of the worktable (1) along the height direction of the worktable (1) to make the metal strip (110) tensioned; the linkage component (5) is configured such that when the detection rod (41) switches from the first state to the second state, the positioning rod (61) can switch from the first extreme position to the second extreme position.

2. The metal strip cutting device according to claim 1, characterized in that, The linkage component (5) includes: The first linkage component (51) is fixedly connected to the detection rod (41). The second linkage (52) is slidably connected to the worktable (1) along the length direction of the worktable (1); When the detection rod (41) is in the first state, the second linkage (52) abuts against the first linkage (51) along the length direction of the worktable (1), and the positioning rod (61) abuts against the second linkage (52) from top to bottom along the height direction of the worktable (1) and is in the first extreme position; when the detection rod (41) is in the second state, the second linkage (52) passes through the first linkage (51) along the length direction of the worktable (1), and the positioning rod (61) passes through the second linkage (52) along the height direction of the worktable (1) and moves to the second extreme position.

3. The metal strip cutting device according to claim 2, characterized in that, The linkage component (5) further includes a first elastic element (53). Along the length direction of the worktable (1), one end of the first elastic element (53) is fixedly connected to the worktable (1), and the other end of the first elastic element (53) is fixedly connected to the second linkage element (52). The elastic restoring force of the first elastic element (53) can drive the second linkage element (52) to pass through the first linkage element (51) along the length direction of the worktable (1).

4. The metal strip cutting device according to claim 2, characterized in that, The tensioning assembly (6) further includes a second elastic element (63). Along the height direction of the worktable (1), one end of the second elastic element (63) is fixedly connected to the positioning rod (61), and the other end of the second elastic element (63) is fixedly connected to the worktable (1). The elastic restoring force of the second elastic element (63) can drive the positioning rod (61) to move from the first extreme position to the second extreme position.

5. The metal strip cutting device according to claim 2, characterized in that: The metal strip cutting device also includes a first limiting member (71) fixedly connected to the workbench (1). When the detection rod (41) is in the second state, the second linkage member (52) passes through the first linkage member (51) along the length direction of the workbench (1) and abuts against the first limiting member (71). And / or, the metal strip cutting device further includes a second limiting member (72) fixedly connected to the worktable (1). When the positioning rod (61) is in the second extreme position, the positioning rod (61) passes through the second linkage member (52) along the height direction of the worktable (1) and abuts against the second limiting member (72).

6. The metal strip cutting device according to any one of claims 1-3, characterized in that, The detection component (4) further includes a third elastic element (42). Along the height direction of the worktable (1), one end of the third elastic element (42) is fixedly connected to the detection rod (41), and the other end of the third elastic element (42) is fixedly connected to the worktable (1). The elastic restoring force of the third elastic element (42) can drive the detection rod (41) to switch from the first state to the second state.

7. The metal strip cutting device according to any one of claims 1-3, characterized in that, The metal strip cutting device also includes two third limiting members (73), which are located on both sides of the worktable (1) in a corresponding manner along the length of the worktable (1), and both third limiting members (73) are located between the unwinding roller and the winding roller (21). Each of the third limiting members (73) is provided with a limiting hole that extends along the length of the worktable (1), and the metal strip (110) can pass through the limiting hole and contact the inner top wall of the limiting hole and the top surface of the worktable (1).

8. The metal strip cutting device according to any one of claims 1-3, characterized in that, The tensioning wheel (62) is rotatably connected to the positioning rod (61) around its own central axis; the metal strip cutting device also includes a warning component (8), which includes: Warning bell (81), the warning bell (81) is movably connected to the workbench (1); Cam (82), which is coaxially arranged with tension wheel (62), is used to strike the warning bell (81).

9. The metal strip cutting device according to any one of claims 1-3, characterized in that, The winding structure (2) further includes a first rotary drive (22), which is fixedly connected to the workbench (1) and drivenly connected to the winding roller (21); the metal strip cutting device further includes a safety component (9), which is located between the circular saw blade (31) and the winding roller (21) along the length of the workbench (1), and the safety component (9) includes: A switch button (91) is fixedly connected to the workbench (1) and is spaced apart on the top surface of the workbench (1) along the height direction of the workbench (1). The switch button (91) is electrically connected to the first rotary drive (22). The switch button (91) is used to start and stop the first rotary drive (22). A push rod (92) and a fourth elastic element (93) are provided. The push rod (92) slides through the worktable (1) along the height direction of the worktable (1). The fourth elastic element (93) is configured to drive the push rod (92) to abut against the metal strip (110) on the top surface of the worktable (1) from bottom to top along the height direction of the worktable (1), and to drive the push rod (92) to abut against the switch button (91) from bottom to top along the height direction of the worktable (1).

10. The metal strip cutting apparatus according to any one of claims 1-3, characterized in that, The tensioning component (6) includes two positioning rods (61), and the number of the detection component (4) and the linkage component (5) are both two. The two detection components (4), the two linkage components (5) and the two positioning rods (61) of the tensioning component (6) are set in a one-to-one correspondence. Along the width direction of the worktable (1), the two positioning rods (61) are located on both sides of the metal strip (110) on the top surface of the worktable (1), and the tensioning wheel (62) of the tensioning assembly (6) is located between the two positioning rods (61).

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