A circular die-cutting device and die-cutting process based on negative pressure adsorption of paperboard

Abstract

The present invention relates to the field of cardboard die-cutting, and specifically to a circular die-cutting device and die-cutting process based on negative pressure adsorption of cardboard, wherein the circular die-cutting device comprises a frame, a negative pressure device and a control mechanism; the frame is provided with a vertical plate and a mounting beam, the vertical plate is provided with a knife roller and a bottom roller, a gap for cardboard to pass through is provided between the knife roller and the bottom roller, and the mounting beam is movably arranged on the vertical plate; the negative pressure device comprises a mounting frame, a transmission belt and a negative pressure component; the mounting frame is movably arranged on the vertical plate, the mounting frame is provided with two support rollers, the transmission belt is sleeved on the two support rollers, and the mounting frame is built with a motor for controlling the rotation of the support rollers; the negative pressure component is arranged on the mounting frame; the control mechanism comprises a lifting component and a linear drive component. The present invention realizes the function of stably conveying cardboard while performing die-cutting processing on the cardboard, and solves the problem that the cardboard is offset during the processing and affects the processing accuracy.

Description

Technical Field

[0001] The invention relates to the field of cardboard die-cutting, and in particular to a round-to-round die-cutting device and a die-cutting process based on negative pressure adsorption of cardboard. Background Art

[0002] When using a die-cutting machine to process cardboard, in order to improve processing accuracy and processing quality, it is necessary to maintain the position accuracy of the cardboard during the processing. In particular, when using a high-efficiency rotary die-cutting device for large-scale continuous processing, it is difficult to ensure the stability of the cardboard's position because the contact between the cardboard and the knife roller is line contact. Once the cardboard is deflected, the die-cutting position will change, affecting the processing quality.

[0003] To this end, Chinese patent CN118061588B discloses a packaging box cardboard die-cutting machine, which performs die-cutting of packaging box cardboard, and the cardboard is subjected to rolling action of a knife roller and a bottom roller, and at the same time, the through hole of the bottom roller generates an adsorption force on the scraps of the cardboard under the action of a negative pressure generating device, so that the cardboard is more stable during the cutting process by the die-cutting knife, which is conducive to ensuring the die-cutting accuracy. Since the adsorbed part of the cardboard is the scrap part, as the die-cutting action proceeds, the part of the cardboard corresponding to the paper box will not adhere to the surface of the bottom roller, so that the cardboard can smoothly leave the bottom roller and the knife roller.

[0004] However, during the processing, in order to prevent the negative pressure suction from affecting the movement of the cardboard, the adsorption position of the negative pressure generating device is the scrap position. After the adsorption position of the scrap is cut, its connection with the cardboard is no longer firm, and it may still deviate during the processing and affect the processing accuracy of the cardboard. Summary of the invention

[0005] In view of the above problems, a circular die-cutting device and a die-cutting process based on negative pressure adsorption of cardboard are provided, which solves the problem of cardboard offset during processing and affecting processing accuracy through a frame, a negative pressure device and a control mechanism.

[0006] In order to solve the problems of the prior art, the present invention provides a circular die-cutting device based on negative pressure adsorption of cardboard, comprising a frame, a negative pressure device and a control mechanism; the frame is provided with a vertical plate and a mounting beam, the vertical plate is provided with a knife roller and a bottom roller, a gap for the cardboard to pass through is provided between the knife roller and the bottom roller, and the mounting beam is movably arranged on the vertical plate; the negative pressure device comprises a mounting frame, a transmission belt and a negative pressure component; the mounting frame is movably arranged on the vertical plate, the mounting frame is provided with two supporting rollers, the transmission belt is sleeved on the two supporting rollers, and the mounting frame is built-in with a motor for controlling the rotation of the supporting rollers; the negative pressure component is arranged on the mounting frame; the control mechanism comprises a lifting component and a linear drive component; the lifting component is used to drive the mounting beam to lift; the linear drive component is used to drive the mounting frame to move along the mounting beam; in the working state, when the transmission belt contacts the cardboard, the negative pressure component adsorbs the cardboard.

[0007] Preferably, the negative pressure component includes a mounting seat, in which a negative pressure chamber for providing negative pressure is provided; at least three adsorption holes are opened on the transmission belt, and the multiple adsorption holes are equidistantly distributed along the extension direction of the transmission belt; in the working state, negative pressure is provided when the adsorption holes on the transmission belt are connected to the negative pressure chamber on the mounting seat.

[0008] Preferably, an adjusting mechanism for adjusting the distance between the two support rollers is provided on the mounting frame, and the adjusting mechanism includes an extension plate and a tensioning assembly; the extension plate is connected to the mounting frame, and a first support plate and a second support plate are rotatably arranged on the extension plate, and the first support plate is hinged to the second support plate, and the two support rollers are rotatably arranged on the first support plate and the second support plate, respectively, and a third rotating drive for controlling the rotation of the second support plate is provided on the first support plate; the tensioning assembly is arranged on the extension plate, and the tensioning assembly is used to maintain the transmission belt in a taut state.

[0009] Preferably, a transverse plate is provided at the bottom end of the extension plate, and the transverse plate is slidably matched with the extension plate; a first guide rail extending in the horizontal direction is provided on the transverse plate, the support roller is slidably matched with the first guide rail, and a first movable seat is rotatably provided on the support roller, and the two first movable seats are respectively connected to the first support plate and the second support plate.

[0010] Preferably, the tensioning assembly includes a fixed seat, a second movable seat, a first elastic member and a tensioning roller; a second guide rail extending in a vertical direction is provided on the extension plate; the fixed seat is arranged on the extension plate, and the second movable seat is slidably installed on the second guide rail; the two ends of the first elastic member are respectively connected to the fixed seat and the second movable seat; the tensioning roller is rotatably arranged on the second movable seat, and the tensioning roller abuts against the transmission belt under the elastic force of the first elastic member.

[0011] Preferably, a limiting assembly is provided on the mounting frame, and the limiting assembly includes a linear drive, a third movable seat and a limiting plate; the linear drive is arranged on the mounting frame; the third movable seat is slidably matched with the mounting beam; the limiting plate is arranged on the third movable seat, and the driving end of the linear drive is connected to the limiting plate.

[0012] Preferably, a third guide rail is provided on the vertical plate, and a first support seat and a second support seat are slidably mounted on the third guide rail; the knife roller and the bottom roller are rotatably arranged on the first support seat and the second support seat respectively; a clamping assembly for clamping the first support seat is provided on the vertical plate.

[0013] Preferably, the clamping assembly includes a movable plate and a second elastic member; the movable plate is slidably mounted on the vertical plate; the two ends of the second elastic member are respectively connected to the movable plate and the first support seat; and an adjustment assembly for controlling the lifting of the movable plate is provided on the vertical plate.

[0014] Preferably, the adjustment assembly includes a third screw, a guide rod and a rotating handle; the third screw is rotatably set on the vertical plate, and the movable plate is threadedly connected to the third screw; the guide rod is set on the vertical plate, and the first support seat and the movable plate are both slidingly matched with the guide rod; the rotating handle is coaxially connected to the third screw.

[0015] A die-cutting process comprises the following steps:

[0016] S1, move the cardboard to the transmission belt, and the negative pressure component on the transmission belt absorbs the cardboard;

[0017] S2. The cardboard is transported between the knife roller and the bottom roller through a transmission belt, and the cardboard is processed through the cooperation of the knife roller and the bottom roller.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention realizes the function of stably conveying the cardboard while performing die-cutting processing on the cardboard through a frame, a negative pressure device and a control mechanism. The cardboard is conveyed by a transmission belt, and a negative pressure component is used to adsorb the cardboard, thereby further avoiding the offset between the cardboard and the transmission belt. Compared with traditional equipment, the surface contact between the transmission belt and the cardboard replaces the line contact of the traditional equipment, thereby stabilizing the transmission direction of the cardboard, significantly improving the conveying stability of the cardboard, avoiding the offset of the cardboard during the conveying process, and thus ensuring the accurate processing of the cardboard, and solving the problem that the cardboard offsets during the processing and affects the processing accuracy;

[0020] 2. The present invention realizes the function of adsorbing the cardboard through the mounting seat and the negative pressure chamber, and achieves the effect of intermittently providing negative pressure through the connection and separation of multiple adsorption holes evenly distributed on the transmission belt and the negative pressure chamber, so that the cardboard will not bend due to the negative pressure adsorption when it is separated from the transmission belt, and the quality of the cardboard is further stabilized. The adsorption holes will be separated from the negative pressure chamber before separating from the cardboard, thereby avoiding the deformation of the cardboard due to the adsorption force;

[0021] 3. Through the guiding effect of the mounting beam, the transmission belts on the two sets of negative pressure devices remain parallel to each other, and can exert forces in the same direction on the paperboard. The driving direction of the transmission belts is consistent with the driving direction of the knife roller and the bottom roller. The support rollers of the two sets of negative pressure devices are connected by a connecting shaft, and the connecting shaft is supported and limited by a bracket, so that the rotation speeds of the two sets of transmission belts are consistent, avoiding the situation where the paperboard is torn or bent due to unbalanced force;

[0022] 4. The present invention realizes the function of adjusting the distance between the two support rollers through the extension plate, the first support plate, the second support plate and the tensioning assembly, thereby achieving the effect of controlling the effective contact area between the transmission belt and the cardboard. Since the length and width of different types of cardboards are different, when conveying some shorter cardboards, if the contact area between the conveyor belt and the cardboard is large, after the cardboard contacts the knife roller and the bottom roller, the friction force of the transmission belt on the cardboard is still large, which will exert a pulling force on the cardboard, which may cause the cardboard to deform or even break. For this reason, an adjustment mechanism is provided to adjust the length of the effective conveying section of the transmission belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a stereoscopic schematic diagram of a round-to-round die-cutting device based on negative pressure adsorption of paperboard from a first-person perspective;

[0024] Figure 2 It is a stereoscopic schematic diagram of a second perspective of a circular die-cutting device based on negative pressure adsorption of paperboard;

[0025] Figure 3 yes Figure 2 A local enlarged schematic diagram of the middle A;

[0026] Figure 4 yes Figure 2 A partial enlarged schematic diagram of point B in the middle;

[0027] Figure 5 It is a three-dimensional schematic diagram of one group of negative pressure devices in a circular die-cutting device based on negative pressure adsorption of paperboard;

[0028] Figure 6 It is a three-dimensional schematic diagram of a negative pressure device and an adjusting mechanism in a circular die-cutting device based on negative pressure adsorption of paperboard;

[0029] Figure 7 It is a three-dimensional schematic diagram of the adjustment mechanism in a circular die-cutting device based on negative pressure adsorption of paperboard;

[0030] Figure 8 It is a three-dimensional schematic diagram of a first side vertical plate in a circular die-cutting device based on negative pressure adsorption of paperboard;

[0031] Fig. 9It is a three-dimensional schematic diagram of the second side vertical plate in a circular die-cutting device based on negative pressure adsorption of paperboard;

[0032] Fig.10 yes Fig. 9 A partial enlarged schematic diagram of point C in the middle;

[0033] Fig.11 The invention is a three-dimensional schematic diagram of the cooperation of two groups of negative pressure devices in a circular die-cutting device based on negative pressure adsorption of paperboard.

[0034] The numbers in the figure are: 1-frame; 11-vertical plate; 111-third guide rail; 112-first support seat; 113-second support seat; 12-knife roller; 13-bottom roller; 14-mounting beam; 15-pressing assembly; 151-movable plate; 152-second elastic member; 16-adjusting assembly; 161-third screw rod; 162-guide rod; 163-rotating handle; 2-negative pressure device; 21-mounting frame; 211-support roller; 22-transmission belt; 221-adsorption hole; 23-negative pressure assembly; 231-mounting seat; 2311-negative pressure chamber; 232-connecting plate; 3-control mechanism; 31-lifting assembly; 311-first rotary drive; 312 -first screw; 313-pulley; 314-synchronous belt; 32-linear drive assembly; 321-second rotary drive; 322-second screw; 323-bevel gear; 33-limiting assembly; 331-linear drive; 332-third movable seat; 333-limiting plate; 4-adjusting mechanism; 41-extension plate; 411-first support plate; 4111-third rotary drive; 412-second support plate; 413-second guide rail; 42-tensioning assembly; 421-fixed seat; 422-second movable seat; 423-first elastic member; 424-tensioning roller; 43-cross plate; 431-first guide rail; 432-first movable seat; 5-cardboard. DETAILED DESCRIPTION

[0035] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] Reference Figure 1-Figure 5 and Fig.11A circular die-cutting device based on negative pressure adsorption of paperboard, comprising a frame 1, a negative pressure device 2 and a control mechanism 3; the frame 1 is provided with a vertical plate 11 and a mounting beam 14, the vertical plate 11 is provided with a knife roller 12 and a bottom roller 13, there is a gap between the knife roller 12 and the bottom roller 13 for paperboard 5 to pass through, the mounting beam 14 is movably arranged on the vertical plate 11; the negative pressure device 2 comprises a mounting frame 21, a transmission belt 22 and a negative pressure assembly 23; the mounting frame 21 is movably arranged on the vertical plate 11, and two supporting Roller 211, transmission belt 22 is sleeved on two supporting rollers 211, and the mounting frame 21 is equipped with a motor for controlling the rotation of the supporting roller 211; the negative pressure component 23 is arranged on the mounting frame 21; the control mechanism 3 includes a lifting component 31 and a linear drive component 32; the lifting component 31 is used to drive the mounting beam 14 to rise and fall; the linear drive component 32 is used to drive the mounting frame 21 to move along the mounting beam 14; in the working state, when the transmission belt 22 contacts the paperboard 5, the negative pressure component 23 adsorbs the paperboard 5.

[0037] The present invention realizes the function of stably conveying the cardboard 5 while performing die-cutting processing on the cardboard 5 through the frame 1, the negative pressure device 2 and the control mechanism 3, and conveys the cardboard 5 through the transmission belt 22. At the same time, the negative pressure component 23 is used to adsorb the cardboard 5, further avoiding the offset between the cardboard 5 and the transmission belt 22. Compared with the traditional equipment, the surface contact between the transmission belt 22 and the cardboard 5 replaces the line contact of the traditional equipment, stabilizes the transmission direction of the cardboard 5, and significantly improves the conveying stability of the cardboard 5. Avoiding the offset of the cardboard 5 during the conveying process, thereby ensuring the accurate processing of the cardboard 5, and solving the problem that the cardboard 5 is offset during the processing and affects the processing accuracy. The lifting assembly 31 includes a first rotary driver 311, a first screw 312, a pulley 313 and a synchronous belt 314. The first rotary driver 311 is arranged on the vertical plate 11, the first screw 312 is rotatably arranged on the frame 1, the first screw 312 is threadedly connected to the mounting beam 14, two pulleys 313 are provided, and the two pulleys 313 are respectively arranged on the driving ends of the first screw 312 and the first rotary driver 311, and the synchronous belt 314 connects the two pulleys 313. The linear drive assembly 32 includes a second rotary driver 321, a second screw 322 and a bevel gear 323. The second rotary driver 321 is arranged on the mounting beam 14. The second screw 322 is rotatably arranged on the mounting beam 14. The mounting frame 21 is threadedly connected to the second screw 322. There are two bevel gears 323. The two bevel gears 323 are respectively sleeved on the driving end of the second rotary driver 321 and the second screw 322. The two bevel gears 323 are meshed and connected. The vertical plate 11 is provided with a rotary drive assembly for driving the knife roller 12 and the bottom roller 13 to rotate, and the rotary drive assembly is not shown in the figure. The frame 1 is provided with a support platform for supporting and conveying the cardboard 5, and the support platform is located below the transmission belt 22. There are two groups of negative pressure devices 2. The two groups of negative pressure devices 2 are symmetrically arranged on the mounting beam 14 about the central axis of the mounting beam 14. Through the guiding effect of the mounting beam 14, the transmission belts 22 on the two groups of negative pressure devices 2 remain parallel to each other, and can exert forces in the same direction on the cardboard 5. The driving direction of the transmission belt 22 is consistent with the driving direction of the knife roller 12 and the bottom roller 13. The support rollers 211 of the two groups of negative pressure devices 2 are connected by a connecting shaft, and the connecting shaft is supported and limited by a bracket, so that the rotation speed of the two groups of transmission belts 22 is consistent, avoiding the cardboard 5 from being torn or bent due to unbalanced force. The second screw 322 is provided with two threaded sections with opposite spiral directions, and the mounting frames 21 of the two negative pressure devices 2 are respectively threadedly connected with the two threaded sections on the second screw 322. When processing the cardboard 5, first adjust the position of the mounting frame 21 and the transmission belt 22 according to the width of the cardboard 5, so that the transmission belt 22 can stably transport the cardboard 5.The first rotary driver 311 and the second rotary driver 321 are preferably servo motors. The frame 1 is provided with a controller for human-machine interaction. The first rotary driver 311 and the second rotary driver 321 are both electrically connected to the controller. To this end, the operator sends a signal to the first rotary driver 311 through the controller. The first rotary driver 311 drives the first screw 312 to rotate through the pulley 313 and the synchronous belt 314. The first screw 312 drives the mounting beam 14 threadedly connected thereto to move. The mounting beam 14 drives the mounting frame 21 and the transmission belt 22 to rise and fall, so that the bottom surface of the transmission belt 22 can smoothly contact the cardboard 5. Then, the controller sends a signal to the second rotary driver 321. The second rotary driver 321 drives the second screw 322 to rotate through the bevel gear 323. The second screw 322 drives the two mounting frames 21 threadedly connected thereto to move in opposite directions at the same speed until the two transmission belts 22 can stably contact the two sides of the cardboard 5. During the processing, the cardboard 5 is pushed to the knife roller 12 and the bottom roller 13 for processing through the transmission of the transmission belt 22 and the support of the support platform. After the cardboard 5 contacts the transmission belt 22, the negative pressure component 23 on the transmission belt 22 adsorbs the cardboard 5, thereby increasing the force between the transmission belt 22 and the cardboard 5, and further avoiding relative movement between the cardboard 5 and the transmission belt 22 to affect the processing accuracy of the cardboard 5.

[0038] Reference Figure 5-Figure 7 : The negative pressure component 23 includes a mounting seat 231, in which a negative pressure chamber 2311 for providing negative pressure is provided; at least three adsorption holes 221 are provided on the transmission belt 22, and the plurality of adsorption holes 221 are equidistantly distributed along the extension direction of the transmission belt 22; in the working state, when the adsorption holes 221 on the transmission belt 22 are connected with the negative pressure chamber 2311 on the mounting seat 231, negative pressure is provided.

[0039] The present invention realizes the function of adsorbing the cardboard 5 through the mounting seat 231 and the negative pressure chamber 2311, and achieves the effect of intermittently providing negative pressure through the connection and separation of multiple adsorption holes 221 evenly distributed on the transmission belt 22 and the negative pressure chamber 2311, so that the cardboard 5 will not bend due to the negative pressure adsorption when it is separated from the transmission belt 22, and the quality of the cardboard 5 is further stabilized. Since the negative pressure component 23 provides negative pressure adsorption to the cardboard 5 during operation. When the cardboard 5 is separated from the transmission belt 22, if it is still affected by negative pressure, the edge of the cardboard 5 will be lifted. The cardboard 5 will then contact the knife roller 12 and the bottom roller 13. Once the edge of the cardboard 5 is lifted, it is likely to be offset when it is in line contact with the knife roller 12 and the bottom roller 13 and is pushed. To this end, adsorption holes 221 are arranged at intervals on the transmission belt 22. During the conveying process, the adsorption holes 221 move with the movement of the transmission belt 22, and after the transmission belt 22 contacts the cardboard 5, it will also drive the cardboard 5 to move synchronously. When the adsorption holes 221 move to the bottom of the negative pressure cavity 2311 of the mounting seat 231, they are connected with the negative pressure cavity 2311, and then negative pressure attraction is provided through the negative pressure cavity 2311. At this time, the adsorption holes 221 and the cardboard 5 remain relatively still until the adsorption holes 221 are separated from the negative pressure cavity 2311 as the transmission belt 22 moves, and then they are no longer connected with the negative pressure cavity 2311, and then no longer provide adsorption force. Subsequent adsorption holes 221 also continue to move to the area of ​​the negative pressure cavity 2311 to continue to adsorb the cardboard 5. Before the adsorption holes 221 are separated from the cardboard 5, they will first be separated from the negative pressure cavity 2311, thereby avoiding the cardboard 5 from being deformed by the adsorption force.

[0040] Reference Figure 1 , Figure 6 and Figure 7 : The mounting frame 21 is provided with an adjusting mechanism 4 for adjusting the distance between the two support rollers 211, and the adjusting mechanism 4 includes an extension plate 41 and a tensioning assembly 42; the extension plate 41 is connected to the mounting frame 21, and a first support plate 411 and a second support plate 412 are rotatably arranged on the extension plate 41, and the first support plate 411 is hinged to the second support plate 412, and the two support rollers 211 are rotatably arranged on the first support plate 411 and the second support plate 412, and the first support plate 411 is provided with a third rotating driver 4111 for controlling the rotation of the second support plate 412; the tensioning assembly 42 is arranged on the extension plate 41, and the tensioning assembly 42 is used to maintain the transmission belt 22 in a taut state.

[0041] The present invention realizes the function of adjusting the distance between the two support rollers 211 through the extension plate 41, the first support plate 411, the second support plate 412 and the tensioning assembly 42, thereby achieving the effect of controlling the effective contact area between the transmission belt 22 and the cardboard 5. Since the length and width of different types of cardboards 5 are different, when conveying some shorter cardboards 5, if the contact area between the conveyor belt and the cardboard 5 is large, after the cardboard 5 contacts the knife roller 12 and the bottom roller 13, the friction force of the transmission belt 22 on the cardboard 5 is still large, which will apply a pulling force to the cardboard 5, which may cause the cardboard 5 to deform or even break. For this reason, an adjustment mechanism 4 is provided to adjust the length of the effective conveying section of the transmission belt 22. The third rotary driver 4111 is preferably a micro servo motor, and the third rotary driver 4111 is electrically connected to the controller. The two support rollers 211 are respectively located at the ends of the first support plate 411 and the second support plate 412 away from the third rotary driver 4111; when adjusting, the operator sends a signal to the third rotary driver 4111 through the controller, and after receiving the signal, the third rotary driver 4111 drives the second support plate 412 to rotate relative to the first support plate 411, thereby providing a rotational torque. When the angle between the first support plate 411 and the second support plate 412 changes, the spacing between the two support rollers 211 changes accordingly, and then the deformation of the transmission belt 22 is controlled by the two support rollers 211, and during the deformation process, the transmission belt 22 is kept taut by the tensioning assembly 42, so that the transmission belt 22 provides a stable conveying effect for the cardboard 5.

[0042] Reference Figure 5 and Figure 7 : A horizontal plate 43 is provided at the bottom end of the extension plate 41, and the horizontal plate 43 is slidably matched with the extension plate 41; a first guide rail 431 extending in the horizontal direction is provided on the horizontal plate 43, the support roller 211 is slidably matched with the first guide rail 431, and a first movable seat 432 is rotatably provided on the support roller 211, and the two first movable seats 432 are respectively connected to the first support plate 411 and the second support plate 412.

[0043] The present invention realizes the function of guiding the movement of the support roller 211 through the transverse plate 43, the first guide rail 431 and the first movable seat 432. The mounting seat 231 is of split design, and a connecting plate 232 is provided on the mounting seat 231, the connecting plate 232 is slidably matched with the first guide rail 431, and the connecting plate 232 is rotatably connected with the support roller 211; the support roller 211 is supported and connected by the first movable seat 432, and the movement of the support roller 211 is guided by the first guide rail 431, so that the line between the axes of the two support rollers 211 always extends along the first guide rail 431, and then the first guide rail 431 is horizontally set to keep the effective conveying surface of the transmission belt 22 extending in the horizontal direction, so as to avoid the transmission belt 22 affecting the negative pressure attraction and conveying force due to the inclination, and maintain the stable conveying of the cardboard 5. When the third rotation driver 4111 controls the first support plate 411 and the second support plate 412 to unfold, since the support rollers 211 at the ends of the first support plate 411 and the second support plate 412 are guided by the first guide rail 431, the two support rollers 211 move along the first guide rail 431, and the connecting plate 232 on the mounting seat 231 also moves with the movement of the support rollers 211, thereby making the first support plate 411 and the second support plate 412 move toward each other with respect to the extension plate 41, thereby controlling the extension and retraction of the split-design mounting seat 231, adjusting the capacity of the negative pressure chamber 2311, and controlling the distribution area of ​​the negative pressure chamber 2311.

[0044] Reference Figure 6 and Figure 7 : The tensioning assembly 42 includes a fixed seat 421, a second movable seat 422, a first elastic member 423 and a tensioning roller 424; a second guide rail 413 extending in the vertical direction is provided on the extension plate 41; the fixed seat 421 is arranged on the extension plate 41, and the second movable seat 422 is slidably installed on the second guide rail 413; the two ends of the first elastic member 423 are respectively connected to the fixed seat 421 and the second movable seat 422; the tensioning roller 424 is rotatably arranged on the second movable seat 422, and the tensioning roller 424 abuts against the transmission belt 22 under the elastic force of the first elastic member 423.

[0045] The present invention realizes the function of keeping the transmission belt 22 taut through the fixed seat 421, the second movable seat 422, the first elastic member 423 and the tensioning roller 424. When the first support plate 411 and the second support plate 412 are controlled to rotate by the third rotary driver 4111, the tension of the transmission belt 22 changes accordingly, and the second movable seat 422 expands and contracts under the elastic force of the first elastic member 423 until the pressure of the transmission belt 22 on the tensioning roller 424, the gravity on the tensioning roller 424 and the elastic force provided by the first elastic member 423 are balanced, the tensioning roller 424 maintains a stable state, and applies tension to the transmission belt 22, keeps the transmission belt 22 in a taut state, and then provides a stable conveying effect through the transmission belt 22.

[0046] Reference Figure 1 and Figure 5 : A limiting assembly 33 is provided on the mounting frame 21, and the limiting assembly 33 includes a linear driver 331, a third movable seat 332 and a limiting plate 333; the linear driver 331 is arranged on the mounting frame 21; the third movable seat 332 is slidably matched with the mounting beam 14; the limiting plate 333 is arranged on the third movable seat 332, and the driving end of the linear driver 331 is connected to the limiting plate 333.

[0047] The present invention realizes the function of guiding and limiting the two sides of the cardboard 5 through the linear driver 331, the third movable seat 332 and the limiting plate 333, further improving the stability of the cardboard 5 conveying. The limiting plate 333 is preferably an acrylic plate with a certain elasticity, and a piezoelectric ceramic for sensing tension is provided at the connection between the driving end of the linear driver 331 and the limiting plate 333. After the transmission belt 22 is adjusted to a suitable position, the cardboard 5 is conveyed to the transmission belt 22, and then the third movable seat 332 is controlled by the linear driver 331 to approach the transmission belt 22. When the limiting plate 333 contacts the edge of the cardboard 5 and is subjected to resistance, the piezoelectric ceramic feedback signal is sent to the controller, and the controller stops the driving of the linear driver 331. Then the cardboard 5 is processed. During the processing, the limiting plates 333 located on the outer sides of the two transmission belts 22 guide and limit the two sides of the cardboard 5, further avoiding the deviation of the cardboard 5.

[0048] Reference Figure 8 and Fig. 9 : A third guide rail 111 is provided on the vertical plate 11, and a first support seat 112 and a second support seat 113 are slidably mounted on the third guide rail 111; the knife roller 12 and the bottom roller 13 are rotatably arranged on the first support seat 112 and the second support seat 113 respectively; a clamping assembly 15 for clamping the first support seat 112 is provided on the vertical plate 11.

[0049] The present invention realizes the function of providing downward pressure to the knife roller 12 through the first support seat 112, the second support seat 113 and the clamping assembly 15. During the processing, in order to ensure that the knife roller 12 can provide a stable cutting force to the paperboard 5, it is necessary to apply downward pressure to the knife roller 12. For this purpose, the clamping assembly 15 is provided to control the first support seat 112 to move toward the second support seat 113. After the paperboard 5 contacts the knife roller 12, the knife roller 12 and the bottom roller 13 cooperate to cut the paperboard 5.

[0050] Reference Figure 8-Figure 10 : The clamping assembly 15 includes a movable plate 151 and a second elastic member 152; the movable plate 151 is slidably mounted on the vertical plate 11; the two ends of the second elastic member 152 are respectively connected to the movable plate 151 and the first support seat 112; the vertical plate 11 is provided with an adjustment assembly 16 for controlling the lifting of the movable plate 151.

[0051] The present invention realizes the function of adjusting the downward pressure through the movable plate 151, the second elastic member 152 and the adjustment component 16. The second elastic member 152 is preferably a compression spring. When processing cardboards 5 of different thicknesses, it is necessary to adjust the downward pressure required for processing. For this purpose, the adjustment component 16 is provided, and the spacing between the movable plate 151 and the second support seat 113 is adjusted by the adjustment component 16, thereby controlling the extension and contraction of the second elastic member 152, controlling the initial compression state of the second elastic member 152, and thereby adjusting the elastic force provided by the second elastic member 152, and providing downward pressure to the first support seat 112 through the elastic force provided by the second elastic member 152.

[0052] Reference Figure 8-Figure 10 : The adjustment assembly 16 includes a third screw 161, a guide rod 162 and a rotating handle 163; the third screw 161 is rotatably set on the vertical plate 11, and the movable plate 151 is threadedly connected to the third screw 161; the guide rod 162 is set on the vertical plate 11, and the first support seat 112 and the movable plate 151 are both slidably matched with the guide rod 162; the rotating handle 163 is coaxially connected to the third screw 161.

[0053] The present invention realizes the function of adjusting the position of the movable plate 151 through the third screw 161, the guide rod 162 and the rotating handle 163. When adjusting the downward force, the operator rotates the rotating handle 163, and the rotating handle 163 drives the third screw 161 to rotate, and then drives the movable plate 151 threadedly connected thereto to move through the third screw 161, adjusts the distance between the movable plate 151 and the second support seat 113, and then adjusts the initial compression amount of the second elastic member 152.

[0054] Reference Figure 1-Figure 5 :A die-cutting process, comprising the following steps:

[0055] S1, moving the paperboard 5 to the conveyor belt 22, and the negative pressure component 23 on the conveyor belt 22 adsorbs the paperboard 5;

[0056] S2, conveying the paperboard 5 to between the knife roller 12 and the bottom roller 13 through the transmission belt 22, and processing the paperboard 5 through the cooperation of the knife roller 12 and the bottom roller 13.

[0057] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A circular die-cutting device based on negative pressure adsorption of cardboard, characterized in that: It comprises a frame (1), a negative pressure device (2) and a control mechanism (3); A vertical plate (11) and a mounting beam (14) are provided on the frame (1); a knife roller (12) and a bottom roller (13) are provided on the vertical plate (11); a gap is provided between the knife roller (12) and the bottom roller (13) for paperboard (5) to pass through; and the mounting beam (14) is movably arranged on the vertical plate (11); The negative pressure device (2) comprises a mounting frame (21), a transmission belt (22) and a negative pressure assembly (23); The mounting frame (21) is movably arranged on the vertical plate (11), two supporting rollers (211) are arranged on the mounting frame (21), the transmission belt (22) is sleeved on the two supporting rollers (211), and a motor for controlling the rotation of the supporting rollers (211) is built into the mounting frame (21); The negative pressure assembly (23) is arranged on the mounting frame (21); The control mechanism (3) comprises a lifting component (31) and a linear drive component (32); The lifting assembly (31) is used to drive the mounting beam (14) to move up and down; The linear drive assembly (32) is used to drive the mounting frame (21) to move along the mounting beam (14); In a working state, when the transmission belt (22) contacts the paperboard (5), the negative pressure component (23) adsorbs the paperboard (5); The negative pressure assembly (23) comprises a mounting seat (231), wherein a negative pressure chamber (2311) for providing negative pressure is provided in the mounting seat (231); At least three adsorption holes (221) are provided on the transmission belt (22), and the plurality of adsorption holes (221) are distributed at equal distances along the extension direction of the transmission belt (22); In a working state, when the adsorption hole (221) on the transmission belt (22) is connected to the negative pressure chamber (2311) on the mounting seat (231), the negative pressure chamber (2311) provides negative pressure to the paperboard (5) through the adsorption hole (221); An adjusting mechanism (4) for adjusting the distance between the two supporting rollers (211) is provided on the mounting frame (21), and the adjusting mechanism (4) comprises an extension plate (41) and a tensioning assembly (42); The extension plate (41) is connected to the mounting frame (21); a first support plate (411) and a second support plate (412) are rotatably arranged on the extension plate (41); the first support plate (411) and the second support plate (412) are hingedly connected; two support rollers (211) are rotatably arranged on the first support plate (411) and the second support plate (412), respectively; and a third rotation driver (4111) for controlling the rotation of the second support plate (412) is provided on the first support plate (411); The tensioning assembly (42) is arranged on the extension plate (41), and the tensioning assembly (42) is used to maintain the transmission belt (22) in a tensioned state.

2. The circular die-cutting device based on negative pressure adsorption of cardboard according to claim 1, characterized in that: A transverse plate (43) is provided at the bottom end of the extension plate (41), and the transverse plate (43) is slidably matched with the extension plate (41); A first guide rail (431) extending in the horizontal direction is provided on the transverse plate (43), the support roller (211) is slidably matched with the first guide rail (431), and a first movable seat (432) is rotatably provided on the support roller (211), and the two first movable seats (432) are respectively connected to the first support plate (411) and the second support plate (412).

3. The circular die-cutting device based on negative pressure adsorption of cardboard according to claim 1, characterized in that: The tensioning assembly (42) comprises a fixed seat (421), a second movable seat (422), a first elastic member (423) and a tensioning roller (424); The extension plate (41) is provided with a second guide rail (413) extending in the vertical direction; The fixed seat (421) is arranged on the extension plate (41), and the second movable seat (422) is slidably mounted on the second guide rail (413); Two ends of the first elastic member (423) are respectively connected to the fixed seat (421) and the second movable seat (422); The tensioning roller (424) is rotatably disposed on the second movable seat (422), and the tensioning roller (424) abuts against the transmission belt (22) under the elastic force of the first elastic member (423).

4. The circular die-cutting device based on negative pressure adsorption of cardboard according to claim 1, characterized in that: A limiting assembly (33) is provided on the mounting frame (21), and the limiting assembly (33) comprises a linear drive (331), a third movable seat (332) and a limiting plate (333); The linear drive (331) is arranged on the mounting frame (21); The third movable seat (332) is slidably matched with the mounting beam (14); The limiting plate (333) is arranged on the third movable seat (332), and the driving end of the linear driver (331) is connected to the limiting plate (333).

5. The circular die-cutting device based on negative pressure adsorption of cardboard according to claim 1, characterized in that: A third guide rail (111) is provided on the vertical plate (11), and a first support seat (112) and a second support seat (113) are slidably mounted on the third guide rail (111); The knife roller (12) and the bottom roller (13) are rotatably arranged on the first support seat (112) and the second support seat (113) respectively; A clamping assembly (15) for clamping the first support seat (112) is provided on the vertical plate (11).

6. The circular die-cutting device based on negative pressure adsorption of cardboard according to claim 5, characterized in that: The pressing assembly (15) comprises a movable plate (151) and a second elastic member (152); The movable plate (151) is slidably mounted on the vertical plate (11); Two ends of the second elastic member (152) are respectively connected to the movable plate (151) and the first support seat (112); An adjustment component (16) for controlling the lifting and lowering of the movable plate (151) is provided on the vertical plate (11).

7. The circular die-cutting device based on negative pressure adsorption of paperboard according to claim 6, characterized in that: The adjustment assembly (16) comprises a third screw rod (161), a guide rod (162) and a rotating handle (163); The third screw rod (161) is rotatably disposed on the vertical plate (11), and the movable plate (151) is threadably connected to the third screw rod (161); The guide rod (162) is arranged on the vertical plate (11), and the first support seat (112) and the movable plate (151) are both slidably matched with the guide rod (162); The rotating handle (163) is coaxially connected to the third screw rod (161).

8. A die-cutting process, using a circular die-cutting device based on negative pressure adsorption of paperboard as described in any one of claims 1 to 7, characterized in that: The following steps are involved: S1, moving the cardboard (5) to the transmission belt (22), and the negative pressure component (23) on the transmission belt (22) adsorbs the cardboard (5); S2. The paperboard (5) is transported to between the knife roller (12) and the bottom roller (13) by means of a transmission belt (22), and the paperboard (5) is processed by means of the cooperation between the knife roller (12) and the bottom roller (13).

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