A synchronous material scraping mechanism of a cutter of a bag making machine

Abstract

The utility model relates to a kind of synchronous material scraping mechanism of bag making machine cutter, by setting scraping device in cutter side, including scraper frame, scraping component, scraping sliding mechanism, scraping drive mechanism and scraping lifting mechanism, scraping component is constituted by mounting rod, scraping mounting plate and multiple scraping blocks, one end of mounting rod linkage drive or lifting mechanism, the other end detachably connected mounting plate, when working, drive mechanism drives scraping component to be close to or away from cutter, lifting mechanism adjusts axial position, sliding mechanism slides along cutter surface, realizes cleaning, multiple scraping blocks overall replacement, simplify maintenance, mechanical drive keeps pressure stable, guarantee cleaning effect, multiple scraping blocks improve scraping efficiency, adapt to production demand.

Description

Technical Field

[0001] This utility model relates to the field of bag making machines, and in particular to a synchronous scraping mechanism for a bag making machine cutter. Background Technology

[0002] Bags are indispensable items in people's daily lives, used for storing and carrying items for convenience. With the development of the petrochemical industry, various types of plastic bags have greatly improved their ease of use due to their lightweight, high strength, and good toughness; at the same time, the rapid growth of the express delivery industry has further driven a surge in demand for packaging products such as express delivery bags. As a key piece of equipment in the production of plastic packaging bags, the efficiency of the cutting blade cleaning of the bag-making machine directly affects product quality and production continuity.

[0003] In the prior art, Chinese Patent Application No. 2024220425427 discloses a scraping mechanism for a bag making machine. The cleaning is achieved by a single scraping block sliding back and forth along the surface of the cutter. However, as the bag size increases and the cutter length increases, the stroke of the single scraping block is significantly extended, resulting in an increase in scraping time and restricting the production speed of the bag making machine.

[0004] To address this issue, patent application number 2024230912388 proposed an improved scheme involving simultaneous operation of multiple scraping blocks. This method shortens the travel distance by using multiple scraping blocks to scrape material in segments, thus improving efficiency to some extent. However, this second-generation scraping mechanism still has the following shortcomings in practical applications: 1. In the existing technology, each scraper block adopts an independent fixed structure. Since the wear of the scraper will be uniform, each scraper needs to be disassembled and replaced after wear. The operation is cumbersome and time-consuming, which increases downtime maintenance time and affects production continuity.

[0005] 2. Insufficient stability of scraping pressure: The contact pressure between the scraper block and the cutter relies on the pre-tension of the mechanical spring. After long-term use, the spring is prone to fatigue and failure, resulting in a decrease in scraping force, a decline in cleaning effect, and even the occurrence of missed scraping. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a synchronous scraping mechanism for the cutting knife of a bag making machine, which addresses the shortcomings of the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a synchronous scraping mechanism for a bag-making machine cutter, comprising a cutting device with a cutter, a scraping device on one side of the cutter, the scraping device comprising a scraper frame, a scraping assembly mounted on the scraper frame, a scraping sliding mechanism for driving the scraping assembly to slide along the outer surface of the cutter, a scraping driving mechanism for driving the scraping assembly to approach or move away from the cutter, and a scraping lifting mechanism for driving the scraping assembly to rise and fall axially, the scraping assembly comprising several mounting rods, a scraping mounting plate, and multiple scraping blocks mounted on the scraping mounting plate, one end of the mounting rod passing through the scraper frame and being linked with the scraping lifting mechanism and / or the scraping driving mechanism, and the other end being detachably connected to the scraping mounting plate.

[0008] The above technical solution involves a scraping device comprising a scraper frame, a scraping assembly, a scraping sliding mechanism, a scraping drive mechanism, and a scraping lifting mechanism, all mounted on one side of the cutter. The scraping assembly consists of a mounting rod, a scraping mounting plate, and multiple scraping blocks. One end of the mounting rod is linked to the scraping lifting mechanism and / or the scraping drive mechanism, while the other end is detachably connected to the scraping mounting plate. During operation, the scraping drive mechanism moves the scraping assembly closer to or further from the cutter, the scraping lifting mechanism adjusts the axial position of the scraping assembly, and the scraping sliding mechanism moves the scraping assembly along the outer surface of the cutter, thus cleaning the cutter. Since multiple scraping blocks are mounted on the same scraping mounting plate, and the mounting plate is detachably connected to the mounting rod, when the scraping blocks wear out, the entire scraping assembly can be replaced by disassembling the connection between the mounting rod and the scraping mounting plate. The frame design avoids the cumbersome operation of individually disassembling each scraper block, which is required for independent fixing in existing technologies. This reduces downtime for maintenance, improves production continuity, lowers equipment costs, and simplifies the structure. Secondly, the scraper assembly's approach / remote movement, axial lifting, and sliding along the cutter surface are all driven by a mechanical structure, replacing the mechanical spring pre-tensioning method used in existing technologies. This avoids the problem of scraping pressure attenuation caused by spring fatigue failure after long-term use, ensuring stable contact pressure between the scraper block and the cutter, guaranteeing cleaning effect, and reducing missed scraping. At the same time, the setting of multiple scraper blocks can simultaneously scrape the cutter surface under the action of the scraper sliding mechanism. Compared with a single scraper block, this shortens the scraping stroke, improves scraping efficiency, and adapts to the production needs of larger bag sizes and longer cutters.

[0009] The aforementioned synchronous scraping mechanism for a bag-making machine cutter can be further configured as follows: the scraping drive mechanism includes a driven gear and a steering seat at both ends of the mounting rod, a drive gear meshing with the driven gear on the scraper frame, a transmission rack meshing with the drive gear on the scraper frame, and a scraping lateral drive assembly for driving the transmission rack to slide laterally. The number of mounting rods is two, and they are respectively located at both ends of the scraping mounting plate. One end of the steering seat is fixedly connected to the mounting rod, and the other end is hinged to the scraping mounting plate through a hinge shaft. The steering seat and the scraping mounting plate are detachably connected through the hinge shaft.

[0010] The technical principle of the scraper drive mechanism using the above technical solution is that a drive gear meshes with a transmission rack on the scraper frame. The transmission rack is driven to slide laterally by the scraper lateral drive assembly, thereby driving the drive gear to rotate. The drive gear then meshes with the driven gears at both ends of the mounting rod, causing the mounting rod to rotate circumferentially. Since there are two mounting rods, each located at one end of the scraper mounting plate, one end of each rod is fixedly connected to a steering seat, and the other end of the steering seat is hinged to the scraper mounting plate via a hinge shaft, forming a double-link structure. When the mounting rods rotate, the steering seat drives the scraper mounting plate to move closer to or away from the cutter around the hinge shaft as a fulcrum. Simultaneously, the steering seat and the scraper mounting plate are detachably connected via the hinge shaft. Due to the symmetrical structural design of the two mounting rods connecting to both ends of the scraper mounting plate, combined with the steering seat... The articulated drive ensures that the scraper mounting plate remains parallel to the cutter during movement, preventing tilting caused by unilateral force. This ensures uniform contact between multiple scraper blocks and the cutter surface, solving the problem of unstable scraping pressure in existing technologies and guaranteeing consistent scraping results. The detachable connection between the steering seat and the scraper mounting plate via the articulated shaft facilitates quick disassembly of the scraper mounting plate for overall replacement or maintenance after scraper block wear. Compared to the existing structure where each scraper block is independently fixed, this reduces the number of disassembly steps, shortens downtime for maintenance, and improves production continuity. Simultaneously, the lateral sliding of the transmission rack transmits power through the mechanical structure, providing uniform driving force and controllable stroke, adapting to the scraping requirements of cutters of different specifications, and ensuring reliable entry and exit of the scraper assembly from the working position.

[0011] The aforementioned synchronous scraping mechanism for a bag-making machine cutter can be further configured as follows: the hinge shaft is a bolt; the steering seat has clamping connection parts at both ends of the mounting rod and the hinge shaft; the scraping mounting plate has hinge seats at both ends of the mounting rod; the bolt passes through the hinge seats and the clamping connection parts respectively and is threadedly connected to the nut; the scraping mounting plate has a scraping mounting groove; the scraping blocks are arranged side by side in the scraping mounting groove and are fixedly installed in the scraping mounting groove by fasteners.

[0012] Using the above technical solution, the steering seat is equipped with clamping connection parts at both ends of the mounting rod and the hinge shaft. The scraper mounting plate is equipped with hinge seats at both ends corresponding to the mounting rod. Bolts pass through the hinge seats and clamping connection parts respectively and are threaded to the nuts to form a detachable hinge structure. At the same time, a scraper mounting groove is opened in the scraper mounting plate, and the scraper blocks are arranged side by side in the groove and fixed by fasteners, which can easily adjust the relative position of each scraper block (copper brush). Secondly, the clamping connection parts at both ends of the steering seat are fixedly connected to the mounting rod, which can evenly transmit the circumferential rotation torque of the mounting rod to the scraper mounting plate. With the symmetrical arrangement of the double mounting rods, the parallelism of the scraper mounting plate during movement is further ensured, so that the contact pressure between the scraper block and the cutter surface is consistent, reducing local missed scraping caused by uneven force.

[0013] The aforementioned synchronous scraping mechanism for a bag-making machine cutter can be further configured as follows: the scraping transverse drive assembly includes transverse drive cylinders disposed at opposite ends of the scraper frame, a transverse sliding rod disposed between the transverse drive cylinders, and a transverse connecting member connecting the transverse sliding rod to the transmission rack. The transverse drive cylinders drive the transmission rack to move transversely, thereby driving the scraper frame to enter or leave the lower end face of the cutter.

[0014] The technical principle of the scraper lateral drive assembly using the above technical solution is to set opposing lateral drive cylinders at both ends of the scraper frame, with a lateral sliding rod connected between the two cylinders. The lateral sliding rod is fixed to the transmission rack via a lateral connecting piece. When the lateral drive cylinders extend or retract, they drive the lateral sliding rod to move laterally, which in turn drives the transmission rack to slide laterally synchronously via the lateral connecting piece. This achieves the switching of the scraper frame's working position from entering or leaving the lower end face of the cutter. The opposing dual lateral drive cylinders provide symmetrical driving force, and the rigid connection with the lateral sliding rod avoids the need for single-cylinder drive. This design addresses potential lateral misalignment or jamming of the transmission rack, ensuring smooth movement of the scraper frame and improving the alignment accuracy between the scraping assembly and the lower end face of the cutter. It solves the problem of scraping position deviation caused by unstable lateral movement of the scraping mechanism in existing technologies. The transmission rack is fixed to the lateral sliding rod through a lateral connecting piece, forming a multi-point support structure. This enhances the rack's anti-torsion capability during lateral movement, avoids transmission lag caused by increased rack meshing clearance due to deformation, and ensures that the scraping assembly can accurately follow the cutter's movement rhythm to achieve synchronous scraping, reducing missed scraping or secondary material sticking caused by movement delay.

[0015] The aforementioned synchronous scraping mechanism for a bag-making machine cutter can be further configured as follows: both ends of the transverse sliding rod are connected to the output ends of the corresponding transverse drive cylinders via couplings; both ends of the transmission rack are provided with transverse guide grooves; the end of the scraper frame corresponding to the drive gear facing the transmission rack is provided with a positioning guide installed in the transverse guide groove; both ends of the scraper frame are provided with limit blocks, and the limit blocks are set on the travel path of the transmission rack.

[0016] The technical principle of the scraper lateral drive assembly using the above technical solution is to connect the two ends of the lateral sliding rod to the output ends of the corresponding lateral drive cylinders through a coupling, so that the driving force of the two cylinders is directly transmitted to the lateral sliding rod. At the same time, lateral guide grooves are opened at both ends of the transmission rack, and the positioning guides on the scraper frame are embedded in the grooves to form sliding constraints. The limit blocks at both ends of the scraper frame are set on the travel path of the transmission rack. During operation, the lateral drive cylinder drives the lateral sliding rod to move laterally through the coupling, and drives the transmission rack to slide along the mating direction of the positioning guides and the lateral guide grooves through the lateral connecting piece. The rigid connection of the coupling avoids the accumulation of clearance in the traditional pin connection, reduces the concentricity requirement, eliminates the lateral off-center load caused by single-end drive, solves the jamming problem when the transmission rack moves laterally, and improves the smooth operation of the mechanism. The smooth operation of the transverse guide groove and the positioning guide form a double guiding constraint, limiting the vertical and horizontal offset of the transmission rack during lateral movement. This ensures stable meshing clearance between the rack and the drive gear, avoiding transmission impact caused by changes in tooth backlash, and reducing gear meshing noise and wear. The limit stop precisely controls the maximum stroke of the transmission rack through mechanical hard limiting, replacing the method of relying on sensors or cylinder stroke control. This avoids the risk of overtravel caused by electrical component failure. At the same time, the position of the stop can be adjusted according to the cutter length to adapt to the scraping stroke requirements of different cutter specifications. The coupling connection facilitates disassembly and maintenance. When the transverse drive cylinder or transverse sliding rod fails, the corresponding end coupling can be disassembled and the component replaced without disassembling the entire drive assembly, thus shortening maintenance time.

[0017] The aforementioned synchronous scraping mechanism for a bag-making machine cutter can be further configured as follows: the scraping lifting mechanism includes a scraping lifting cylinder mounted on the scraper frame, the driven gears are all sleeved on the outer circumferential surface of the mounting rod, and the driven gears are loosely connected to the mounting rod, so that the scraping cylinder can drive the mounting rod to axially lift relative to the driven gear, thereby causing the scraping mounting plate to axially move closer to or further away from the cutter.

[0018] The technical principle of the scraper lifting mechanism using the above-mentioned technical solution is to install a scraper lifting cylinder on the scraper frame, with the driven gear loosely keyed to the outer circumference of the mounting rod. When the scraper lifting cylinder extends or retracts, it drives the mounting rod to rise or fall axially relative to the driven gear, thereby causing the scraper mounting plate, along with the scraper block, to move closer to or away from the lower end face of the cutter. The loose keyed connection allows the mounting rod to slide axially within the driven gear while maintaining circumferential transmission. This does not affect the scraping action of the drive gear driving the mounting rod to rotate through the driven gear, and it can also independently achieve lifting and adjustment, solving the problem of traditional fixed connections. The structural conflict between rotation and lifting cannot be resolved simultaneously. The axial driving force provided by the lifting cylinder can precisely control the contact pressure between the scraper block and the cutter. Pressure grading is achieved by adjusting the air pressure to avoid cutter damage caused by rigid contact. At the same time, it can adapt to scraping needs of cutters with different thicknesses or degrees of material adhesion. The axial lifting of the mounting rod allows the scraper block to be completely detached from the cutter surface when not in operation, reducing unnecessary contact wear and extending the service life of the scraper block. Moreover, the keyed connection structure is simple, and when the mounting rod or driven gear is worn, it can be disassembled and replaced separately, reducing maintenance costs.

[0019] The aforementioned synchronous scraping mechanism for a bag-making machine cutter can be further configured as follows: the mounting rod has a square shaft portion at one end facing the driven gear, the driven gear has a linkage hole that mates with the square shaft portion, the square shaft portion passes through the linkage hole and drives the driven gear to rotate circumferentially, the square shaft portion can be raised and lowered axially along the linkage hole, the scraper frame has a gear limiting plate at one end corresponding to the driven gear, the gear limiting plate presses against the end of the driven gear away from the scraper block, and has a clearance groove in the middle for axial displacement of the square shaft portion.

[0020] By adopting the above technical solution, a square shaft is provided at the end of the mounting rod facing the driven gear, and a linkage hole is provided on the driven gear to cooperate with the square shaft. The square shaft passes through the linkage hole, so that when the mounting rod rotates, the driven gear is driven to rotate circumferentially through the square shaft. At the same time, the square shaft can be raised and lowered axially along the linkage hole. A gear limiting plate is provided at the end of the scraper frame corresponding to the driven gear. The gear limiting plate presses on the end of the driven gear away from the scraper block, and a relief groove is provided in the middle to allow axial displacement of the square shaft. This forms an axial limit on the driven gear, ensuring the stable meshing position of the driven gear and the driving gear, and avoiding poor meshing or tooth dislodgement caused by axial displacement of the gear.

[0021] The aforementioned synchronous scraping mechanism for a bag-making machine cutter can be further configured as follows: the scraping sliding mechanism includes a scraping base, a scraping drive source disposed on the scraping base, and a linear slide rail disposed between the scraping base and the scraper frame. The linear slide rail is arranged parallel to the cutter, the scraper frame is mounted on the linear slide rail, and the output end of the scraping drive source is connected to the scraper frame, thereby driving the scraping assembly to reciprocate along the linear slide rail.

[0022] By adopting the above technical solution, a scraper base is set as the installation foundation, a scraper drive source is installed on the scraper base, and a linear slide rail parallel to the cutter is set between the scraper base and the scraper frame. The scraper frame is mounted on the linear slide rail, and the output end of the scraper drive source is connected to the scraper frame. This ensures that the scraper assembly always maintains a preset relative position with the cutter during movement, avoiding incomplete scraping or collision between the scraper block and the cutter edge due to deviation of the movement path. The guiding effect of the linear slide rail makes the movement of the scraper frame more stable and reduces the jamming phenomenon during movement.

[0023] The aforementioned synchronous scraping mechanism for a bag-making machine cutter can be further configured as follows: the scraping drive source is a rodless cylinder, the rodless cylinder is arranged parallel to the cutter, the sliding block of the rodless cylinder is provided with a positioning clamping block, the scraper frame is connected to the positioning clamping block through a connecting seat, and drives the scraper frame to move back and forth along a linear slide rail, and the scraping base is provided with hydraulic buffers at both ends of the linear slide rail.

[0024] By adopting the above technical solution, a rodless cylinder is used as the scraping drive source and is set parallel to the cutter. The positioning clamp on the sliding block of the rodless cylinder is fixed to the connecting seat of the scraper frame, which drives the scraper frame to reciprocate along the linear slide rail. This reduces the space occupied by the mechanism in the length direction of the cutter. At the same time, hydraulic buffers are installed at both ends of the linear slide rail of the scraper base. These buffers can absorb impact energy when the scraper frame moves to the end of its stroke, reduce the inertial impact force during reciprocating motion, avoid rigid collision between the scraper frame and the end of the base, and reduce fatigue damage to the parts. Meanwhile, the damping effect of the buffers makes the scraper frame move more smoothly when changing direction, prevents the scraper block and the cutter surface from bouncing due to instantaneous impact, and ensures the stability of the scraping pressure.

[0025] The aforementioned synchronous scraping mechanism for a bag-making machine cutter can be further configured such that the scraping device also includes an oiling mechanism, which includes an oil supply valve mounted on the scraping base and several oil dripping interfaces mounted on the scraping plate, wherein the oil dripping interfaces are connected to the oil supply valve via hoses.

[0026] Using the above technical solution, the oil supply valve can control the supply of lubricating oil, allowing the drip interface to accurately drip lubricating oil onto the contact area between the scraper and the cutter. The lubricating oil reduces friction between the scraper and the cutter, preventing increased wear caused by dry friction. The multiple drip interfaces can be distributed according to the length of the scraper to ensure that all contact points between the scraper and the cutter are adequately lubricated. The oil supply valve is installed on the scraper base, allowing operators to adjust the oil supply according to actual working conditions, avoiding waste due to excessive lubricating oil or affecting the lubrication effect due to insufficient lubricating oil.

[0027] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model on a bag-making machine.

[0029] Figure 2 This is a cross-sectional schematic diagram of an embodiment of the present utility model.

[0030] Figure 3 This is a schematic diagram of the structure of an embodiment of the present invention in its initial state.

[0031] Figure 4 This is a schematic diagram of the scraping drive mechanism after it has been in operation, according to an embodiment of this utility model.

[0032] Figure 5 This is a schematic diagram of the scraper lifting mechanism after it has been in operation, according to an embodiment of this utility model.

[0033] Figure 6 This is a schematic diagram of the scraping and sliding mechanism after it has been in operation, according to an embodiment of the present invention.

[0034] Figure 7 This is a perspective view of the scraping device according to an embodiment of the present utility model.

[0035] Figure 8 This is an exploded view of the scraping device according to an embodiment of the present invention.

[0036] Figure 9 This is a partial schematic diagram of the scraping device according to an embodiment of the present utility model.

[0037] Figure 10 This is a schematic diagram of the scraper lifting mechanism in an embodiment of the present invention.

[0038] Figure 11 This is a schematic diagram of the mounting rod and driven gear in an embodiment of the present invention. Detailed Implementation

[0039] like Figures 1-11 As shown, a synchronous scraping mechanism for a bag making machine cutter includes a cutting device with a cutter 2 mounted on a frame 1, a scraping device disposed on the cutter 2, and a traction component 11 for feeding material to the cutter 2 for cutting. The scraping device includes a scraper frame 3, a scraping component 4 disposed on the scraper frame 3, a scraping sliding mechanism 5 for driving the scraping component 4 to slide along the outer surface of the cutter 2, a scraping driving mechanism 6 for driving the scraping component 4 to approach or move away from the cutter 2, and a scraping lifting mechanism 7 for driving the scraping component 4 to rise and fall axially. like Figures 7-11As shown, the scraping assembly 4 includes two mounting rods 41, a scraping mounting plate 42, and multiple scraping blocks 43 mounted on the scraping mounting plate 42. The scraping mounting plate 42 has a scraping mounting groove 421. The scraping blocks 43 are arranged side by side in the scraping mounting groove 421 and are fixedly installed in the scraping mounting groove 421 by fasteners 422, so that the scraping blocks 43 can be easily installed and removed from the scraping mounting plate 42. One end of the mounting rod 41 passes through the scraper frame 3 and is linked with the scraping lifting mechanism 7 and the scraping drive mechanism 6. The other end is detachably connected to the scraping mounting plate 42. like Figures 7-11 As shown, the scraper drive mechanism 6 includes a driven gear 61 and a steering seat 62 at both ends of the mounting rod 41, a driving gear 63 on the scraper frame 3 meshing with the driven gear 61, a transmission rack 64 on the scraper frame 3 meshing with the driving gear 63, and a scraper lateral drive assembly for driving the transmission rack 64 to slide laterally. Two mounting rods 41 are respectively located at both ends of the scraper mounting plate 42. One end of the steering seat 62 is fixedly connected to the mounting rod 41, and the other end is hinged to the scraper mounting plate 42 via a hinge shaft 621. The steering seat 62 and the scraper mounting plate 42 are detachably connected via the hinge shaft 621, wherein the hinge shaft 621 is preferably a bolt. The steering seat 62 has clamping connection parts 622 at both ends corresponding to the mounting rod 41 and the hinge shaft 621. The scraper mounting plate 42 has hinges at both ends corresponding to the mounting rod 41. The seat 44 and bolt 621 pass through the hinge seat 44 and clamping connection part 622 respectively and are threaded to the nut 622. By setting the clamping connection part 622, the mounting rod 41 or the hinge shaft 521 can be easily inserted into the steering seat 62, and the tightness can be easily adjusted through the clamping connection part 622 to adjust the fixed state or the hinged state. At the same time, since the mounting rod 41 is hinged to both ends of the scraper mounting plate 42 through the steering seat 62, and the mounting rod 41 achieves a double linkage structure of synchronous steering through the scraper drive mechanism 6, the scraper mounting plate 42 can rotate with the mounting rod 41, so that the scraper mounting plate 42 can always move parallel to the side towards or away from the cutter 2, so that the scraper can achieve stable scraper steering movement in the narrow frame 1 installation space, avoiding affecting the normal operation of the cutter 2.

[0040] like Figure 9 , Figure 10As shown, the scraper lateral drive assembly includes lateral drive cylinders 65 arranged facing each other at both ends of the scraper frame 3, a lateral sliding rod 66 arranged between the lateral drive cylinders 65, and a lateral movement connector 641 connecting the lateral sliding rod 66 to the transmission rack 64. The lateral drive cylinders 65 drive the transmission rack 64 to move laterally, causing the scraper frame 3 to enter or disengage from the lower end face of the cutter 2. Both ends of the lateral sliding rod 66 are connected to the output ends of the corresponding lateral drive cylinders 65 via couplings 67. Both ends of the moving rack 64 are provided with transverse guide grooves 642. The scraper frame 3, corresponding to the drive gear 63 facing the rack 64, is provided with a positioning guide 31 installed in the transverse guide groove 642. Both ends of the scraper frame 3 are provided with limit blocks 30, which are set on the travel path of the rack 64. The positioning guide 31 is preferably a screw, which passes through the transverse guide groove 642 with a waist-shaped groove structure and connects to the scraper frame 3. In this way, the rack 64 can be installed on the scraper frame 3. The rack 64 is guided laterally by the positioning guide 31 to prevent deviation and ensure constant engagement with the drive gear 63. The limit stop 30 limits the lateral displacement range of the transmission rack 64 to prevent excessive movement. One end of the lateral sliding connector 641 is connected to the transmission rack 64, and the other end is connected to the lateral sliding rod 66. The lateral sliding rod 66 is provided with two positioning clamps 661, which can be detachably installed at any position on the lateral sliding rod 66, so that the positioning clamps 661 form a groove for the lateral sliding connector 641 to connect. This allows for convenient adjustment of the movement stroke of the scraper mounting plate 42. At the same time, the opposing arrangement of the two lateral drive cylinders 65 can provide symmetrical and balanced driving force to ensure smooth movement of the transmission rack 64. This makes the rotation of the drive gear 63, driven gear 61 and mounting rod 41 synchronous and precise, ultimately driving the scraper mounting plate 42 and the scraper block 43 on it to move parallel to or away from the cutter 2, realizing the stable application or release of scraping pressure.

[0041] like Figures 2-11As shown, the scraper lifting mechanism 7 includes a scraper lifting cylinder 71 mounted on the scraper frame 3. Driven gears 61 are all sleeved on the outer circumferential surface of the mounting rod 41, and the driven gears 61 and the mounting rod 41 are loosely connected, allowing the scraper cylinder 71 to drive the mounting rod 41 to axially rise and fall relative to the driven gears 61, thereby causing the scraper mounting plate 42 to axially move closer to or away from the cutter 2. One end of the mounting rod 41 facing the driven gear 61 has a square shaft portion 411, and the driven gear 61 has a linkage hole 611 that mates with the square shaft portion 411. The square shaft portion 41 passes through the linkage hole 611. The driven gear 61 rotates circumferentially in the 11th position, and the square shaft 41 can rise and fall axially along the linkage hole 611. The scraper frame 3 is provided with a gear limiting plate 32 at one end corresponding to the driven gear 61. The gear limiting plate 32 presses against the end of the driven gear 61 away from the scraper block 42, and has a relief groove 321 in the middle for axial displacement of the square shaft 41. This ensures that the scraper lifting cylinder 71 is always linked with the driven gear 61 during the lifting and lowering of the mounting rod 41, and can rotate circumferentially. Moreover, the driven gear 61 is prevented from being moved upward by the gear limiting plate 32 after being pressed against it, thus improving the transmission efficiency. To improve dynamic efficiency, the gear limiting plate 32 and the driven gear 61 are also equipped with shims to avoid affecting the rotation of the driven gear 61. Preferably, the square shaft portion 411 is only provided on the section of the mounting rod 41 facing the driven gear 61, so that the rest of the mounting rod 41 cannot pass through the linkage hole 611 in the driven gear 61 when it is raised or lowered, thus limiting the axial raising and lowering of the mounting rod 41. At the same time, to avoid affecting the meshing transmission between the driven gear 61 and the driving gear 63, a lifting connecting seat 72 is also provided between the scraper lifting cylinder 71 and the mounting rod 41, with a guide shaft 721 at one end of the lifting connecting seat 72. The other end is connected to the mounting rod 41, and the tightness is adjusted through the clamping connection. One end of the guide shaft 721 passes through the scraper frame 3, and the other end is connected to the output end of the scraper lifting cylinder 71 through the lifting coupling 722, thereby stably driving the scraper block 42 to move axially closer to or away from the cutter 2. At the same time, by controlling the lifting stroke height of the scraper lifting cylinder 71, the degree of contact between the scraper block 42 and the cutter 2 can be precisely controlled. This not only stably controls the scraping accuracy to avoid damage to the cutter 2, but also reduces the wear of the scraper block 42, controls the stroke height, and compensates for the wear stroke.

[0042] like Figures 3-10As shown, the scraping sliding mechanism 5 includes a scraping base 51, a rodless cylinder 52 mounted on the scraping base 51, and a linear slide rail 53 mounted between the scraping base 51 and the scraper frame 3. The linear slide rail 53 is parallel to the cutter 2. The scraper frame 3 is mounted on the linear slide rail 53. The output end of the rodless cylinder 52 is connected to the scraper frame 3 and drives the scraping assembly 4 to move back and forth along the linear slide rail 53. The rodless cylinder 52 is parallel to the cutter 2. A positioning clamp 522 is provided on the sliding block 521 of the rodless cylinder 52. The scraper frame 3 is connected to the positioning clamp 522 through the connecting seat 33 and drives the scraper frame 3 to move back and forth along the linear slide rail 53. Hydraulic buffers 511 are provided at both ends of the scraping base 51 corresponding to the linear slide rail 53.

[0043] like Figures 3-10 As shown, the scraping device also includes an oiling mechanism, which includes an oil supply valve 8 mounted on the scraper base 51 and multiple oil drip ports 81 mounted on the scraper plate 3. The oil drip ports 81 are connected to the oil supply valve 8 via hoses. The scraper frame 3 is provided with hose clamps for fixing the hoses. Thus, the oil supply valve 8 is connected to the oil cup, and then the lubricating oil is delivered to the oil drip ports 81 through the hoses via the oil supply valve 8. In the initial state, the scraper lateral drive assembly is reset. At this time, at least one scraper block 42 on the scraper mounting plate 41 is placed under the oil drip port 81. The oil supply valve 8 pours the lubricating oil onto the scraper block 42 below. As the scraper block 42 scrapes the cutter 2, the lubricating oil is also applied to the scraper block 42 passing through the area, realizing the application and maintenance of lubricating oil on all scraper blocks 42. The optimal number of scraper blocks 42 and oil drip ports 81 is selected so that the scraper block 42 only needs to scrape the cutter area in the corresponding profile, thereby improving the overall efficiency.

[0044] like Figures 3-6 As shown, the working steps of the synchronous scraping mechanism of this utility model are as follows: S1: As Figure 3 As shown, at this time, the oil supply valve 8 is opened, and the lubricating oil is delivered to the drip interface through the hose and dripped into the surface of the scraper block 43 at the initial position. The scraper frame 3 is located in the non-working area outside the cutter 2, and the scraper block 43 is not in contact with the cutter 2. S2: As Figure 4 As shown, the output end of the transverse drive cylinder 65 pushes the transverse sliding rod 66 to extend and retract through the coupling 67. The transverse sliding rod 66 drives the transmission rack 64 to move laterally along the transverse guide groove 642 through the transverse connecting piece 641. The positioning guide piece 31 ensures that the rack has no offset. The transmission rack 64 meshes with the drive gear 63. The drive gear 63 drives the driven gear 61 to rotate, which drives the mounting rod 41 to rotate circumferentially. The mounting rod 41 drives the scraper mounting plate 42 to move through the steering seat 62, so that the scraper block 43 enters the lower / side working area of ​​the cutter 2. S3: The scraper lifting cylinder 71 pushes the mounting rod 41 to rise axially through the lifting connecting seat 72. The square shaft part 411 slides along the linkage hole 611 of the driven gear 61. The gear limiting plate 32 presses against the driven gear 61 to prevent it from moving up with the mounting rod 41. The clearance groove 321 provides lifting space for the square shaft part 411. The scraper block 43 rises with the mounting rod 41 and fits against the surface of the cutter 2. S4: The sliding block 521 of the rodless cylinder 52 drives the scraper frame 3 to move back and forth along the linear slide rail 53 through the positioning clamp 522. The scraper block 43 scrapes the residue laterally along the surface of the cutter 2. The hydraulic buffers 511 at both ends of the linear slide rail absorb the sliding inertia and prevent the scraper frame 3 from rigidly colliding with the frame. S5: The scraper lifting cylinder 71 retracts in the opposite direction, and the mounting rod 41 drives the scraper block 43 to descend axially and separate from the surface of the cutter 2; S6: The transverse drive cylinder 65 pulls the transverse sliding rod 66 in the opposite direction, the transmission rack 64 is reset, and the mounting rod 41 drives the scraping assembly 4 to rotate to the initial position through gear transmission, waiting for the next scraping cycle.

[0045] When the worn scraper block 43 needs to be replaced in this synchronous scraping mechanism, disassembly can be completed simply by separating the scraper mounting plate 42 from the hinge shaft 621. Specifically, use a wrench to loosen the nut 622, pull the bolt 621 out from the hinge seat 44 and the clamping connection part 622, so that the scraper mounting plate 42 is separated from the steering seat 62. Then, remove the scraper mounting plate 42 to be replaced as a whole and directly replace it with a spare scraper mounting plate 42 (with the scraper block 43 loaded), reducing downtime. At the same time, on the replaced scraper mounting plate 42, simply loosen the fastener 422, take out the worn scraper block 43 from the scraper mounting groove 421, insert the new scraper block 43 into the scraper mounting groove 421, and re-tighten the fastener 422 at the set distance for later use.

Claims

1. A synchronous scraping mechanism for a bag-making machine cutter, comprising a cutting device with a cutter, wherein a scraping device is provided on one side of the cutter, characterized in that: The scraping device includes a scraper frame, a scraping assembly mounted on the scraper frame, a scraping sliding mechanism that drives the scraping assembly to slide along the outer surface of the cutter, a scraping driving mechanism that drives the scraping assembly to approach or move away from the cutter, and a scraping lifting mechanism that drives the scraping assembly to rise and fall axially. The scraping assembly includes several mounting rods, a scraping mounting plate, and multiple scraping blocks mounted on the scraping mounting plate. One end of each mounting rod passes through the scraper frame and is linked to the scraping lifting mechanism and / or the scraping driving mechanism, while the other end is detachably connected to the scraping mounting plate.

2. The synchronous scraping mechanism for a bag-making machine cutter according to claim 1, characterized in that: The scraper drive mechanism includes a driven gear and a steering seat at both ends of the mounting rod, a driving gear meshing with the driven gear on the scraper frame, a transmission rack meshing with the driving gear on the scraper frame, and a scraper lateral drive assembly for driving the transmission rack to slide laterally. There are two mounting rods, which are respectively located at both ends of the scraper mounting plate. One end of the steering seat is fixedly connected to the mounting rod, and the other end is hinged to the scraper mounting plate through a hinge shaft. The steering seat and the scraper mounting plate are detachably connected through the hinge shaft.

3. The synchronous scraping mechanism for a bag-making machine cutter according to claim 2, characterized in that: The hinge shaft is a bolt. The steering seat has clamping connection parts at both ends of the mounting rod and the hinge shaft. The scraper mounting plate has hinge seats at both ends of the mounting rod. The bolt passes through the hinge seats and the clamping connection parts and is threaded to the nut. The scraper mounting plate has a scraper mounting groove. The scraper blocks are arranged side by side in the scraper mounting groove and are fixedly installed in the scraper mounting groove by fasteners.

4. The synchronous scraping mechanism for a bag-making machine cutter according to claim 2 or 3, characterized in that: The scraper lateral drive assembly includes lateral drive cylinders arranged facing each other at both ends of the scraper frame, a lateral sliding rod arranged between the lateral drive cylinders, and a lateral movement connector connecting the lateral sliding rod to the transmission rack. The lateral drive cylinders drive the transmission rack to move laterally, causing the scraper frame to enter or leave the lower end face of the cutter.

5. The synchronous scraping mechanism for a bag-making machine cutter according to claim 4, characterized in that: Both ends of the transverse sliding rod are connected to the output end of the corresponding transverse drive cylinder via couplings. Both ends of the transmission rack are provided with transverse guide grooves. The end of the scraper frame corresponding to the drive gear facing the transmission rack is provided with a positioning guide installed in the transverse guide groove. Both ends of the scraper frame are provided with limit blocks, which are set on the travel path of the transmission rack.

6. The synchronous scraping mechanism for a bag-making machine cutter according to claim 2, characterized in that: The scraper lifting mechanism includes a scraper lifting cylinder mounted on the scraper frame. The driven gears are all sleeved on the outer circumferential surface of the mounting rod, and the driven gears are loosely connected to the mounting rod, so that the scraper cylinder can drive the mounting rod to move axially up and down relative to the driven gear, thereby causing the scraper mounting plate to move axially closer to or away from the cutter.

7. The synchronous scraping mechanism for a bag-making machine cutter according to claim 6, characterized in that: The mounting rod has a square shaft portion at one end facing the driven gear. The driven gear has a linkage hole that mates with the square shaft portion. The square shaft portion passes through the linkage hole and drives the driven gear to rotate circumferentially. The square shaft portion can be raised and lowered axially along the linkage hole. The scraper frame has a gear limiting plate at one end corresponding to the driven gear. The gear limiting plate presses against the end of the driven gear away from the scraper block and has a clearance groove in the middle for axial displacement of the square shaft portion.

8. The synchronous scraping mechanism for a bag-making machine cutter according to claim 7, characterized in that: The scraping sliding mechanism includes a scraping base, a scraping drive source mounted on the scraping base, and a linear slide rail mounted between the scraping base and the scraper frame. The linear slide rail is parallel to the cutter, the scraper frame is mounted on the linear slide rail, and the output end of the scraping drive source is connected to the scraper frame, driving the scraping assembly to move back and forth along the linear slide rail.

9. The synchronous scraping mechanism for a bag-making machine cutter according to claim 8, characterized in that: The scraper drive source is a rodless cylinder, which is arranged parallel to the cutter. The sliding block of the rodless cylinder is equipped with a positioning clamp. The scraper frame is connected to the positioning clamp via a connecting seat and drives the scraper frame to move back and forth along the linear slide rail. The scraper base is equipped with hydraulic buffers at both ends of the linear slide rail.

10. The synchronous scraping mechanism for a bag-making machine cutter according to claim 8, characterized in that: The scraping device also includes an oiling mechanism, which includes an oil supply valve mounted on the scraper base and several drip ports mounted on the scraper plate. The drip ports are connected to the oil supply valve via hoses.

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