A high-speed slitting machine

Abstract

This utility model discloses a high-speed slitting machine, relating to the field of production machinery, which solves the problem of high cost in existing bag-making machines. The key technical points are: it includes a cutting device; the cutting device is used to cut valve bags; the cutting device includes a cutting mechanism, a bag-pressing mechanism, and a driving mechanism; the cutting mechanism includes a reciprocating assembly and a cutting blade; the cutting blade is mounted on the reciprocating assembly; the reciprocating assembly drives the cutting blade to reciprocate vertically; the bag-pressing mechanism includes a pressing assembly and a pressing blade; the pressing blade is mounted on the pressing assembly; the pressing assembly drives the pressing blade to reciprocate vertically; the driving mechanism is connected to the reciprocating assembly and the pressing assembly, driving them to move synchronously; when the cutting blade is at the lowest point of its reciprocating stroke, the pressing blade is also at the lowest point of its reciprocating stroke; when the cutting blade is at the highest point of its reciprocating stroke, the pressing blade is at the highest point of its reciprocating stroke. This achieves the goal of reducing costs.

Description

Technical Field

[0001] This utility model relates to the field of production machinery, and more specifically, it relates to a high-speed slitting machine. Background Technology

[0002] The production of valve bags involves key steps such as unwinding, printing, forming, sealing, and cutting. Among these, the cutting process is crucial for precisely cutting continuously fed materials (such as multi-layered composite paper or film) to the required length for a single valve bag. To ensure accurate forming and sealing of the valve bags later, this process requires not only precise length but also a clean, burr-free cut. In existing technologies, to ensure a flat and stable bag surface during cutting and thus guarantee cut quality, pressure is commonly applied to the bag surface at the moment of cutting. A common implementation involves placing a high-pressure gas nozzle above the working area of ​​the cutting device. At the moment the cutting blade falls, a high-speed airflow is sprayed onto the surface of the valve bag to be cut (especially the area near the cutting blade). This airflow compresses the bag surface, causing it to adhere tightly to the worktable below, effectively suppressing material displacement, wrinkles, or warping during the cutting process, ultimately achieving a uniform cut. However, this technical solution has significant drawbacks: the entire cutting device essentially requires the integration of two independent systems that work together: the "cutting" system and the "high-pressure gas pressurization" system. This means that an additional high-pressure gas source, complex gas supply pipelines, pneumatic valves for precise control of the injection, and one or more nozzle structures are required. Simultaneously, to achieve high-precision synchronization between the cutting action and the pneumatic injection action, the control system must possess precise electrical control capabilities driven by sensor feedback signals. This highly integrated pneumatic, mechanical, and electrical system significantly increases the manufacturing cost, system complexity, and daily maintenance requirements of the cutting device. Therefore, finding a simpler, lower-cost alternative that can still effectively guarantee cutting quality has become a pressing issue for the industry. Utility Model Content

[0003] The purpose of this invention is to provide a high-speed slitting machine that achieves bag pressing and cutting through mechanical linkage. It is low-cost while meeting quality requirements, and the mechanical linkage enables high-speed slitting.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a high-speed slitting machine, including a cutting device; the cutting device is used to cut valve bags; the cutting device includes a cutting mechanism, a bag pressing mechanism, and a driving mechanism; the cutting mechanism includes a reciprocating assembly and a cutting blade; the cutting blade is disposed on the reciprocating assembly; the reciprocating assembly drives the cutting blade to reciprocate in the vertical direction; the bag pressing mechanism includes a pressing assembly and a pressing blade; the pressing blade is disposed on the pressing assembly; the pressing assembly drives the pressing blade to reciprocate in the vertical direction; the driving mechanism is connected to the reciprocating assembly and the pressing assembly, and drives the reciprocating assembly and the pressing assembly to move; when the cutting blade is at the lowest point of the reciprocating stroke, the pressing blade is at the lowest point of the reciprocating stroke; when the cutting blade is at the highest point of the reciprocating stroke, the pressing blade is at the highest point of the reciprocating stroke.

[0005] Furthermore, the cutting device includes a frame; the reciprocating assembly includes an eccentric wheel, a drive linkage, and a blade holder; the eccentric wheel is mounted on the frame; a drive handle is mounted on the eccentric wheel; one end of the drive linkage is hinged to the drive handle, and the other end is hinged to the blade holder; a limit block is fixedly mounted on the frame; the blade holder includes a vertical rod; the limit block is sleeved on the vertical rod; the drive linkage drives the vertical rod to reciprocate relative to the limit block; and the cutter is connected to the vertical rod.

[0006] Furthermore, the tool holder includes a crossbar; the vertical bar includes a first vertical bar and a second vertical bar; the limiting block includes a first limiting block and a second limiting block; the first limiting block and the second limiting block are respectively sleeved on the first vertical bar and the second vertical bar; the upper ends of the first vertical bar and the second vertical bar are connected to the crossbar; the lower ends of the first vertical bar and the second vertical bar are connected to the cutting blade; the drive linkage is hinged to the crossbar.

[0007] Furthermore, the pressing assembly includes a cam, a connecting rod, and a spring-loaded component; a small wheel is mounted above the connecting rod and hinged to the pressing knife below; a positioning block is also fitted on the connecting rod; the connecting rod and the positioning block are slidably connected; the positioning block is fixedly connected to the frame; the cam is mounted on the frame; the cam abuts against the small wheel; the spring-loaded component includes a spring-loaded rod with a spring-loaded flange; a support panel is mounted on the frame; the support panel has a through hole for the spring-loaded rod to pass through; a spring is fitted on the spring-loaded rod; the upper and lower ends of the spring respectively cooperate with the spring-loaded flange and the support panel; the lower end of the spring-loaded rod is connected to the pressing knife.

[0008] Furthermore, the cam includes a pressing portion and a rising portion; the pressing portion and the rising portion are arranged opposite to each other; there is a smooth transition between the pressing portion and the rising portion; the radius of the rising portion is smaller than the radius of the pressing portion.

[0009] Furthermore, the springback component includes a first springback component and a second springback component; the springback rods of the first springback component and the second springback component are respectively connected to both ends of the pressure knife.

[0010] Furthermore, a rubber strip is provided at the lower end of the pressure knife.

[0011] Furthermore, the drive mechanism includes a driving wheel, a first driven wheel, and a second driven wheel; the first driven wheel is coaxially connected to an eccentric wheel; the second driven wheel is coaxially connected to a cam; the driving wheel drives the first driven wheel and the second driven wheel to rotate synchronously.

[0012] In summary, this utility model has at least one of the following beneficial effects: 1. By synchronously controlling the reciprocating motion of the cutting mechanism and the bag-pressing mechanism through a single drive mechanism, the pressing and cutting blades are strictly synchronized at their lowest and highest points. This design replaces the traditional independent pneumatic / electric control system with pure mechanical linkage, eliminating the need for high-pressure air sources, solenoid valves, multiple sensors, and complex circuits. This directly reduces equipment manufacturing costs and subsequent maintenance complexity, ensuring quality while achieving high-speed slitting.

[0013] 2. When the cutter is lowered to the lowest point for cutting, the pressure blade presses down simultaneously and tightly against the bag surface, effectively suppressing material displacement, wrinkles or lifting, ensuring a smooth cut without burrs, avoiding cutting deviations caused by uneven pressure in traditional airflow pressing methods, and significantly improving the finished product qualification rate.

[0014] 3. Mechanical linkage eliminates the need for multi-system coordinated control, avoiding risks such as air path blockage and sensor failure, resulting in stronger operational stability. It also reduces vulnerable parts (such as pneumatic nozzles and precision valves), extending equipment lifespan and lowering downtime for maintenance. Synchronous motion is achieved through rigid mechanical connections, offering a faster response than pneumatic / electrical signal transmission, making it compatible with high-speed bag-making production lines and meeting the efficiency requirements of industrial mass production. Attached Figure Description

[0015] Figure 1 This is a front view of the cutting device in Embodiment 2. Figure 2 This is a schematic diagram of the back of the cutting device in Embodiment 2. Figure 3 This is a schematic diagram of the cutting mechanism in Embodiment 3. Figure 4 This is a schematic diagram of the bag-pressing mechanism in Example 4. Figure 5 This is a schematic diagram of the springback component in Example 2. In the diagram: 11. Frame; 12. Worktable; 121. Blade pad; 2. Cutting mechanism; 21. First vertical rod; 22. Second vertical rod; 23. First limiting block; 24. Second limiting block; 25. Cutting blade; 26. Horizontal bar; 27. Drive linkage; 28. Eccentric wheel; 29. ​​Drive handle; 3. Bag pressing mechanism; 301. Lower pressing part; 302. Rising part; 31. Linkage rod; 311. Small wheel; 312. Positioning block; 321. First spring-loaded component; 322. Second spring-loaded component; 33. Pressing blade; 341. Spring-loaded rod; 342. Spring; 343. Spring-loaded flange; 344. Support panel; 41. First driven wheel; 42. Second driven wheel; 431. Transmission wheel; 432. Drive wheel. Detailed Implementation

[0016] To make the technical problems, technical solutions and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component. This "connection" is not limited to a fixed connection or a movable connection; the specific connection method should be determined based on the specific technical problem to be solved.

[0018] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] Example 1: This example describes a valve bag making machine that adopts a fully automated production line design, integrating five major process steps: unwinding, printing, cutting, folding, and sealing. Each step is synchronously linked through a servo system. The raw material roll (such as coated polypropylene woven fabric or composite kraft paper) is drawn into the printing device by the unwinding device. After the pattern is printed, it is conveyed to a high-speed slitting machine through a correction and length setting process. The cut single pieces of material are mechanically folded to form a valve structure, and finally, the valve bag is formed by hot pressing and sealing.

[0021] The high-speed slitting machine includes a cutting device comprising a frame 11, with a worktable 12 positioned below the frame 11. The frame 11 is used to mount a cutting blade mechanism 25, a bag-pressing mechanism 3, and a drive mechanism. The cutting blade mechanism 25 includes a reciprocating assembly and a cutting blade 25; the cutting blade 25 is mounted on the reciprocating assembly; the reciprocating assembly drives the cutting blade 25 to reciprocate vertically. The bag-pressing mechanism 3 includes a pressing assembly and a pressing blade 33; the pressing blade 33 is mounted on the pressing assembly; the pressing assembly drives the pressing blade 33 to reciprocate vertically. The drive mechanism is connected to the reciprocating assembly and the pressing assembly, driving them to move synchronously. When the cutting blade 25 is at the lowest point of its reciprocating stroke, the pressing blade 33 is also at the lowest point of its reciprocating stroke; when the cutting blade 25 is at the highest point of its reciprocating stroke, the pressing blade 33 is also at the highest point of its reciprocating stroke. A blade pad 121 is positioned on the worktable 12 corresponding to the position of the cutting blade 25. The blade pad 121 serves to cushion and reduce blade wear. Material is fed to the worktable 12, and the cutter 25 and pressure blade 33 descend synchronously from their highest point. The pressure blade 33 first contacts the material surface, applying pressure to suppress material displacement. The cutter 25 continues to descend to complete the cut, while the blade pad 121 (polyurethane / engineering plastic) cushions the impact and protects the cutting edge. The cutter 25 and pressure blade 33 synchronously rise back to their highest point, and the finished product is removed.

[0022] The cutting device in this embodiment of a high-speed slitting machine has the following beneficial technical effects: the pressure blade 33 pre-fixes the material to avoid wrinkles, and the cut is flat and burr-free; the mechanical linkage eliminates the need for a pneumatic / hydraulic system, reducing equipment costs and maintenance requirements; the response speed is fast and supports high-speed cutting; there is no risk of high-pressure gas leakage, and the blade pad strip 121 extends the blade life.

[0023] Example 2: Based on Example 1, this example provides a specific synchronization structure to achieve synchronous movement between the cutter 25 mechanism 2 and the pressing mechanism.

[0024] The reciprocating assembly includes an eccentric wheel 28, a drive linkage 27, and a tool holder. The eccentric wheel 28 is mounted on the frame 11. A drive handle 29 is mounted on the eccentric wheel 28. The eccentric wheel 28 is circular, with its center coaxially connected to the drive mechanism, and is driven to rotate by the drive mechanism. The drive handle 29 is located on the disc away from the center. A first bearing is fitted onto the drive handle 29. One end of the drive linkage 27 is hinged to the drive handle 29, and the other end is hinged to the tool holder. Specifically, one end of the drive linkage 27 is connected to the first bearing; a second bearing is mounted on the tool holder, and the other end of the drive linkage 27 is connected to the second bearing. A limit block is fixedly mounted on the frame 11. The tool holder includes a vertical rod; the limit block is fitted onto the vertical rod; the drive linkage 27 drives the vertical rod to reciprocate relative to the limit block; the cutter 25 is connected to the vertical rod. The reciprocating assembly works by converting the rotational motion of the eccentric wheel 28 into the linear reciprocating motion of the cutter 25: when the drive mechanism drives the eccentric wheel 28 to rotate, its eccentrically positioned drive handle 29 performs a circular motion, which pushes the vertical rod of the cutter holder through the drive linkage 27; the vertical rod performs a vertical reciprocating motion along a fixed trajectory under the guidance and constraint of the limit block, thereby driving the cutter 25 to achieve precise cutting. The pressing assembly includes a cam, a connecting rod 31, and a spring-loaded component. A small wheel 311 is mounted on the upper part of the connecting rod 31 and connected to the pressing knife 33 at the lower part. A positioning block 312 is also fitted on the connecting rod 31. The connecting rod 31 and the positioning block 312 are slidably connected. The positioning block 312 is fixedly connected to the frame 11. The cam is mounted on the frame 11 and abuts against the small wheel 311. The spring-loaded component includes a spring-loaded rod 341 with a spring-loaded flange 343. A support panel 344 is mounted on the frame 11. A through hole is provided on the support panel 344 for the spring-loaded rod 341 to pass through. A spring 342 is fitted on the spring-loaded rod 341. The upper and lower ends of the spring 342 cooperate with the spring-loaded flange 343 and the support panel 344, respectively. The lower end of the spring-loaded rod 341 is connected to the pressing knife 33. When the cam rotates, its profile pushes the small wheel at the top of the connecting rod 31 to move down, causing the connecting rod 31 to slide vertically downward along the positioning block 312, so that the pressure knife 33 is pressed down; when the cam rotates to the lowest point, the spring 342 releases the stored elastic potential energy, pushing the return rod 341 and the pressure knife 33 to return upward, completing one pressing-returning cycle.

[0025] Optionally, it includes a return chamber, which is fixedly connected to the frame 11, and the spring 342 is disposed inside the return chamber; the bottom surface of the return chamber is a support panel 344.

[0026] The cutting device is initially configured such that the drive handle 29 of the eccentric wheel 28 is located at the highest point of the eccentric wheel 28, and the return rod 341 is also at its highest point under the action of the spring 342. Alternatively, the drive handle 29 of the eccentric wheel 28 is located at the lowest point of the eccentric wheel 28, and the return rod 341 is also at its lowest point under the action of the spring 342.

[0027] The drive mechanism includes a driving wheel, a first driven wheel 41, and a second driven wheel 42. The first driven wheel 41 is coaxially connected to the eccentric wheel 28; the second driven wheel 42 is coaxially connected to the cam. The driving wheel drives the first driven wheel 41 and the second driven wheel 42 to rotate synchronously. The driving wheel drives the first driven wheel 41 (connected to the eccentric wheel 28) and the second driven wheel 42 (connected to the cam) to rotate synchronously. When the eccentric wheel 28 rotates, its drive handle 29 drives the cutter 25 to perform a vertical reciprocating motion through the connecting rod 31; the cam pushes the pressure knife 33 down to press down the material through its contour and resets under the action of the spring 342. In the initial state (e.g., the high point of the eccentric wheel 28 corresponds to the highest point of the pressure knife 33), it ensures that the two are strictly synchronized during cutting. When the cutter 25 descends to the lowest point, the pressure knife 33 synchronously presses down the material; during reset, the two synchronously rise to the highest point to release the material, achieving precise cutting. A rubber strip is provided at the lower end of the pressure knife 33. This serves to prevent slippage and provide pressure.

[0028] Example 3: Based on Example 2, this example provides a specific structure for a cutter holder that enables synchronous movement of the cutter 25 on both sides. The cutter holder includes a horizontal bar 26; vertical bars include a first vertical bar 21 and a second vertical bar 22; limiting blocks include a first limiting block 23 and a second limiting block 24; the first limiting block 23 and the second limiting block 24 are respectively sleeved on the first vertical bar 21 and the second vertical bar 22; the upper ends of the first vertical bar 21 and the second vertical bar 22 are connected to the horizontal bar 26; the lower ends of the first vertical bar 21 and the second vertical bar 22 are connected to the cutter 25; and a driving link 27 is hinged to the horizontal bar 26. In this example, the driving link 27, driven by the eccentric wheel 28, presses down on the horizontal bar 26; the horizontal bar 26 applies downward pressure to the first vertical bar 21 and the second vertical bar 22, and under the restriction of the first limiting block 23 and the second limiting block 24, the first vertical bar 21 and the second vertical bar 22 can only move in the vertical direction. The lower ends of the first vertical rod 21 and the second vertical rod 22 are respectively connected to the two ends of the cutter 25 to achieve the technical effect of synchronous downward pressure.

[0029] Example 4: This example provides a specific structure for the cam based on Example 2. The cam includes a pressing part 301 and a rising part 302; the pressing part 301 and the rising part 302 are arranged opposite to each other; there is a smooth transition between the pressing part 301 and the rising part 302; the radius of the rising part 302 is smaller than the radius of the pressing part 301. This cam adopts an asymmetrical double-contour design. The pressing part 301 has a larger radius, and during rotation, it pushes the follower (such as a roller or flat bottom) downward through the contour to achieve the working stroke; the rising part 302 has a smaller radius, providing space for the follower to return, and the follower can be quickly reset by the force of the spring 342 or gravity. The smooth transition between the two contours can eliminate abrupt motion changes and reduce impact noise.

[0030] Example 5: This example optimizes the springback component based on Example 2. The springback component includes a first springback component 321 and a second springback component 322; the springback rods 341 of the first springback component 321 and the second springback component 322 are respectively connected to both ends of the pressure knife 33. A spring 342 energy storage-double-end synchronous reset mechanism is used: when the pressure knife 33 is pressed down, the springs 342 of the first and second springback components are simultaneously compressed and stored; after cutting, the springs 342 release their elastic potential energy, which pushes the pressure knife 33 to quickly and synchronously reset through the springback rods 341 at both ends, forming a bidirectional balanced springback.

[0031] Example 6: This example provides a specific implementation of the drive mechanism based on Example 2. The driving wheel includes a drive wheel 432 and a transmission wheel 431; the drive wheel 432 and the transmission wheel 431 are coaxially mounted on the frame 11; the drive wheel 432 is connected to a motor, and the motor can drive the drive wheel 432, thereby driving the transmission wheel 431 to rotate.

[0032] Optionally, the drive wheel 432, transmission wheel 431, first driven wheel 41, and second driven wheel 42 are all sprockets. The drive wheel 432 is connected to the motor via a chain; the transmission wheel 431, first driven wheel 41, and second driven wheel 42 are driven by a chain.

[0033] Optionally, the drive wheel 432, transmission wheel 431, first driven wheel 41, and second driven wheel 42 are all synchronous pulleys. The drive wheel 432 is connected to the motor via a synchronous belt; the transmission wheel 431, first driven wheel 41, and second driven wheel 42 are driven by a synchronous belt.

[0034] The coordinated movement of the pressure knife 33 and the cutting knife 25 can be well guaranteed by using synchronous belt or chain drive.

[0035] Optionally, drive wheel 432 is a belt pulley. Driven by a belt.

[0036] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A high-speed slitting machine, characterized in that: Includes a cutting device; the cutting device is used to cut valve bags; the cutting device includes a cutting mechanism, a bag-pressing mechanism, and a drive mechanism; The cutting mechanism includes a reciprocating assembly and a cutting blade; The cutter is mounted on the reciprocating assembly; the reciprocating assembly drives the cutter to reciprocate in the vertical direction; the bag pressing mechanism includes a pressing assembly and a pressing knife; the pressing knife is mounted on the pressing assembly; the pressing assembly drives the pressing knife to reciprocate in the vertical direction; the drive mechanism is connected to the reciprocating assembly and the pressing assembly, and drives the reciprocating assembly and the pressing assembly to move synchronously. When the cutter is at the lowest point of its reciprocating stroke, the pressure cutter is also at the lowest point of its reciprocating stroke; when the cutter is at the highest point of its reciprocating stroke, the pressure cutter is also at the highest point of its reciprocating stroke.

2. The high-speed slitting machine according to claim 1, characterized in that: The cutting device includes a frame; the reciprocating assembly includes an eccentric wheel, a drive linkage, and a blade holder; the eccentric wheel is mounted on the frame; a drive handle is mounted on the eccentric wheel; one end of the drive linkage is hinged to the drive handle, and the other end is hinged to the blade holder; a limit block is fixedly mounted on the frame; the blade holder includes a vertical rod; the limit block is sleeved on the vertical rod; the drive linkage drives the vertical rod to reciprocate relative to the limit block; the cutter is connected to the vertical rod.

3. A high-speed slitting machine according to claim 2, characterized in that: The blade holder includes a horizontal bar; the vertical bar includes a first vertical bar and a second vertical bar; the limiting block includes a first limiting block and a second limiting block; the first limiting block and the second limiting block are respectively sleeved on the first vertical bar and the second vertical bar; the upper ends of the first vertical bar and the second vertical bar are connected to the horizontal bar; the lower ends of the first vertical bar and the second vertical bar are connected to the cutting blade; the drive linkage is hinged to the horizontal bar.

4. A high-speed slitting machine according to claim 3, characterized in that: The pressing assembly includes a cam, a connecting rod, and a spring-loaded component; a small wheel is mounted above the connecting rod and hinged to the pressing blade below; a positioning block is also fitted on the connecting rod; the connecting rod and the positioning block are slidably connected; the positioning block is fixedly connected to the frame; the cam is mounted on the frame; the cam abuts against the small wheel; The springback component includes a springback rod with a springback flange; a support panel is provided on the frame; the support panel has a through hole for the springback rod to pass through; a spring is sleeved on the springback rod; the upper and lower ends of the spring respectively cooperate with the springback flange and the support panel; the lower end of the springback rod is connected to the pressure knife.

5. A high-speed slitting machine according to claim 4, characterized in that: The cam includes a pressing part and a rising part; the pressing part and the rising part are arranged opposite to each other; there is a smooth transition between the pressing part and the rising part; the radius of the rising part is smaller than the radius of the pressing part.

6. A high-speed slitting machine according to claim 4, characterized in that: The springback component includes a first springback component and a second springback component; the springback rods of the first springback component and the second springback component are respectively connected to both ends of the pressure knife.

7. A high-speed slitting machine according to claim 6, characterized in that: A rubber strip is provided at the lower end of the pressure knife.

8. A high-speed slitting machine according to claim 4, characterized in that: The drive mechanism includes a driving wheel, a first driven wheel, and a second driven wheel; the first driven wheel is coaxially connected to an eccentric wheel; the second driven wheel is coaxially connected to a cam; the driving wheel drives the first driven wheel and the second driven wheel to rotate synchronously.

Images