Circular bottom bag bottom sheet cutting machine convenient to operate and capable of realizing high-quality cutting

Abstract

The application discloses a kind of round bottom bag bottom piece cutting machine of convenient operation and can realize high-quality cutting, comprising: fixed plate, glass plate and support plate are provided on fixed plate, transmission shaft is movably provided in support plate, fixed shaft is rotationally fixed on transmission shaft, fixed shaft is connected with lifting cylinder, transmission shaft is connected with driving mechanism, cutter head shaft is transversely arranged at the bottom of transmission shaft, spring sleeve, tool rest sleeve and positioning sleeve are sleeved on cutter head shaft, limiting plate is arranged on positioning sleeve, limiting plate is abutted on tool rest sleeve, spring sleeve is located at the other side of tool rest sleeve, torsion spring is arranged between tool rest sleeve and spring sleeve, cutter is clamped in tool rest sleeve, movable shaft is movably arranged in the bottom wall of transmission shaft, screw hole is arranged in movable shaft, round press plate is placed on glass plate, screw rod is welded in the center part of round press plate, screw rod on round press plate is threadedly connected with screw hole in movable shaft.The application has simple structure, convenient operation and can improve cutting quality and efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cutting device, especially to a round-bottom bag bottom sheet cutting machine which is convenient to operate and can realize high-quality cutting. BACKGROUND

[0002] In the production of round-bottom plastic packaging bags, the plastic film needs to be cut into a circle, and then the circular plastic film is sealed by a heat sealing process. The current market equipment for cutting the plastic film into a circle either has a complex structure, high purchase and maintenance costs, or a simple structure but cannot cut a plurality of stacked plastic films at one time, or the edges of the cut circular plastic film are not smooth. SUMMARY

[0003] The purpose of the present application is to provide a round-bottom bag bottom sheet cutting machine which is simple in structure, high in cutting quality, convenient to operate and can realize high-quality cutting.

[0004] To achieve the above purpose, the technical solution adopted by the present application is: a round-bottom bag bottom sheet cutting machine which is convenient to operate and can realize high-quality cutting, comprising: a fixed plate, a glass plate is laid on the top wall of the fixed plate, a plurality of stand columns are uniformly distributed on the outer side of the glass plate, a support plate is connected between the stand columns, a guide sleeve is provided on the support plate in an interference fit, a transmission shaft capable of rotating is movably arranged in the guide sleeve, a fixed shaft is rotatably fixed on the transmission shaft, the fixed shaft is connected with the piston rod of a lifting cylinder, the transmission shaft is connected with a driving mechanism, a cutter shaft is transversely arranged at the bottom of the transmission shaft, a spring sleeve, a cutter holder sleeve and a positioning sleeve are sleeved on the cutter shaft, the positioning sleeve abuts against one side wall of the cutter holder sleeve and is fixed on the cutter shaft by a fifth locking screw, a limiting plate is sleeved on the fifth locking screw, an adjusting screw is threadedly connected on the cutter holder sleeve, the limiting plate abuts against the adjusting screw, the spring sleeve is located on the other side of the cutter holder sleeve and is fixed on the cutter shaft by a fourth locking screw, a torsion spring is arranged between the cutter holder sleeve and the spring sleeve, a cutter is clamped in the cutter holder sleeve, a movable shaft is movably arranged in the bottom wall of the transmission shaft, a screw hole is arranged in the movable shaft, a round pressing plate is placed on the glass plate, a screw rod is welded at the center of the round pressing plate, and the screw rod on the round pressing plate is threadedly connected with the screw hole in the movable shaft.

[0005] Further, the aforementioned round-bottom bag bottom sheet cutting machine which is convenient to operate and can realize high-quality cutting, wherein four guide columns are uniformly distributed on the top wall of the support plate, a lifting plate is slidably arranged between the four guide columns, a through hole coaxially aligned with the guide sleeve and a bearing seat are arranged on the lifting plate, the transmission shaft passes through the through hole and the bearing seat in sequence, a shoulder is arranged on the transmission shaft, the shoulder is located between and abuts against the two bearings in the bearing seat, a mounting plate is fixedly arranged between the four guide columns, and the lifting cylinder is vertically arranged on the mounting plate.

[0006] Furthermore, in the aforementioned round bottom bag bottom sheet cutting machine that is easy to operate and can achieve high-quality cutting, the connection structure between the fixed shaft and the transmission shaft is as follows: a reduced diameter section is provided on the transmission shaft, an angular contact bearing is fitted on the reduced diameter section, a retaining spring is clamped on the reduced diameter section located above the angular contact bearing, a bearing groove is provided on the bottom wall of the fixed shaft, the bearing groove is fitted on the angular contact bearing, and a number of first set bolts are evenly distributed around the side wall of the fixed shaft, the first set bolts abut against the outer ring of the angular contact bearing.

[0007] Furthermore, in the aforementioned round bottom bag bottom sheet cutting machine that is easy to operate and can achieve high-quality cutting, the driving mechanism includes: a chain drive assembly and a servo geared motor. A motor base is provided on the lifting plate, the servo geared motor is fixed on the motor base, the driving sprocket in the chain drive assembly is connected to the servo geared motor, and the driven sprocket in the chain drive assembly is fixed on the drive shaft.

[0008] Furthermore, in the aforementioned round bottom bag bottom sheet cutting machine that is easy to operate and can achieve high-quality cutting, several downward pressure rod cylinders are evenly distributed around the bottom wall of the support plate, and a rubber block is provided on the piston rod of the pressure rod cylinder.

[0009] Furthermore, in the aforementioned round bottom bag bottom sheet cutting machine that is easy to operate and can achieve high-quality cutting, a limiting sleeve is fitted on the drive shaft located below the support plate, and the limiting sleeve is fixed to the drive shaft by a second set bolt.

[0010] Furthermore, the aforementioned round bottom bag bottom sheet cutting machine, which is easy to operate and can achieve high-quality cutting, includes a connecting shaft on the drive shaft, a square block mounted on the drive shaft, a horizontally aligned connecting through hole between the square block and the drive shaft, a reducing screw on the connecting shaft, the reducing screw passing through the aligned connecting through hole and extending out of the square block, the connecting shaft abutting against the square block, a locking nut threaded onto the reducing screw, the locking nut also abutting against the square block, a connecting sleeve fixedly mounted on the connecting shaft, a cutter head shaft passing through and fixedly mounted in the connecting sleeve, and several third set bolts threaded onto the connecting sleeve, the third set bolts on the connecting sleeve abutting against the connecting shaft and the cutter head shaft respectively.

[0011] Further, the aforementioned circular-bottom bag bottom sheet cutting machine convenient to operate and capable of achieving high-quality cutting, wherein the connecting structure between the transmission shaft and the movable shaft is that: a mounting hole is formed through the bottom wall of the transmission shaft and the connecting through hole in the transmission shaft, a U-shaped plate is clamped in the mounting hole, the U-shaped plate abuts against the reduced diameter screw rod of the connecting shaft, a through hole is formed in the U-shaped plate, a plurality of tight fixing screw holes are arranged on the square block, a tight fixing hole is arranged on the transmission shaft and is aligned with the tight fixing screw hole and is connected with the mounting hole, a tight fixing bolt is threadedly connected in the tight fixing screw hole, the tight fixing bolt abuts against the U-shaped plate after passing through the aligned tight fixing hole, the movable shaft is T-shaped, a screw hole is arranged on the small diameter section of the movable shaft, and the small diameter section of the movable shaft is threadedly connected with the screw rod after being movably arranged through the through hole in the U-shaped plate.

[0012] Further, the aforementioned circular-bottom bag bottom sheet cutting machine convenient to operate and capable of achieving high-quality cutting, wherein a plurality of exhaust holes are uniformly distributed on the circumference of the circular pressing plate.

[0013] Further, the aforementioned circular-bottom bag bottom sheet cutting machine convenient to operate and capable of achieving high-quality cutting, wherein the bottom wall of the fixed plate is connected with a lifting mechanism, the lifting mechanism comprises: an upper guide frame and a lower guide frame, the upper guide frame is fixed on the bottom wall of the fixed plate, two first hinged arms are hinged in the upper guide frame, a first guide wheel is arranged on the first hinged arm, the first guide wheel is rollingly clamped in the lower guide frame, a first synchronization plate is arranged between the two first hinged arms, two second hinged arms are hinged in the lower guide frame, the hinged positions of the second hinged arms are on the same side as the hinged positions of the first hinged arms, a second guide wheel is arranged on the second hinged arm, the second guide wheel is rollingly clamped in the upper guide frame, a second synchronization plate is arranged between the two second hinged arms, the first hinged arm is rotationally connected with the second hinged arm on the same side, a pneumatic cylinder seat is arranged on the second synchronization plate close to the rotationally connected position of the first hinged arm and the second hinged arm, a hinged seat is arranged on the first synchronization plate close to the first guide wheel, a push-up pneumatic cylinder is hinged on the pneumatic cylinder seat, a piston rod on the push-up pneumatic cylinder is hinged with the hinged seat, a locking plate is rotationally arranged on any one of the first hinged arms, a plurality of adjusting holes are arranged on the locking plate at intervals, a groove plate capable of accommodating the locking plate and not interfering with the movement of the first hinged arm and the second hinged arm is arranged on the first hinged arm, and a locking hole is arranged on the second hinged arm on the same side as the first hinged arm provided with the locking plate.

[0014] The advantage of the present application is that: the structure is simple and convenient to operate, when cutting circular plastic films of different diameters, only the corresponding diameter circular pressing plate and the position of the cutter need to be adjusted; the cutter can automatically and slowly descend during cutting, which is convenient for cutting a plurality of stacked plastic films and improves the cutting efficiency; moreover, the cutter is in contact with the glass plate after cutting, the cutter will not cause cutting marks on the glass plate, and the glass plate will not damage the cutter, which affects the sharpness of the cutter, thereby ensuring that the circular plastic film after each cutting has a smooth edge. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the round bottom bag bottom sheet cutting machine described in this invention, which is easy to operate and can achieve high-quality cutting.

[0016] Figure 2 yes Figure 1 A schematic diagram of the structure after removing the lifting mechanism.

[0017] Figure 3 yes Figure 2 A schematic diagram of the connection structure between the cutter head shaft and the spring sleeve, the tool holder sleeve, and the positioning sleeve.

[0018] Figure 4 yes Figure 2 A schematic diagram of the cross-sectional structure. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0020] like Figures 1-4As shown, the bottom sheet cutting machine for round-bottom bag convenient to operate and capable of realizing high-quality cutting comprises a fixed plate 1, a glass plate 2 is laid on the top wall of the fixed plate 1, a plurality of stand columns 11 are circumferentially distributed on the fixed plate 1 outside the glass plate 2, the stand columns 11 can limit the glass plate 2 and prevent the glass plate 2 from moving out of the fixed plate 1, a supporting plate 12 is connected between the stand columns 11, a plurality of downward pressure rod air cylinders 13 are circumferentially distributed on the bottom wall of the supporting plate 12, a rubber block 131 is arranged on the piston rod of the pressure rod air cylinder 13, a guide sleeve 121 is interference-fitted on the supporting plate 12, four guide columns 14 are circumferentially distributed on the top wall of the supporting plate 12, a lifting plate 3 is slidingly arranged between the four guide columns 14, a through hole coaxially aligned with the guide sleeve 121 and a bearing seat 31 are arranged on the lifting plate 3, a mounting plate 15 is fixedly arranged between the four guide columns 14, a lifting air cylinder 151 is vertically arranged on the mounting plate 15, a fixed shaft 16 is connected to the piston rod of the lifting air cylinder 151, a transmission shaft 4 is rotatably fixed in the fixed shaft 16, the connecting structure between the fixed shaft 16 and the transmission shaft 4 is that a reduced-diameter section is arranged on the transmission shaft 4, an angular contact bearing 41 is sleeved on the reduced-diameter section, a snap spring is clamped on the reduced-diameter section above the angular contact bearing 41, a bearing groove is arranged on the bottom wall of the fixed shaft 16, the bearing groove is sleeved on the angular contact bearing 41, a plurality of first set screws 161 are circumferentially distributed on the side wall of the fixed shaft 16, the first set screws 161 abut against the outer ring of the angular contact bearing 41, the fixed shaft 16 is fixedly connected with the angular contact bearing 41 through the first set screws 161, the transmission shaft 4 is slidingly connected with the guide sleeve 121 on the supporting plate 12 after sequentially penetrating through the bearing seat 31 on the lifting plate 3 and the through hole on the lifting plate 3, a shoulder is arranged on the transmission shaft 4, the shoulder is located between the two bearings in the bearing seat 31 and abuts against the inner rings of the two bearings in the bearing seat 31, when the transmission shaft 4 rotates, only the inner rings of the two bearings in the bearing seat 31 are driven to rotate, and the bearing seat 31 is not affected, the transmission shaft 4 is connected with a driving mechanism, the driving mechanism comprises a chain transmission assembly and a servo reduction motor 32, a motor seat 33 is arranged on the lifting plate 3, the servo reduction motor 32 is fixed on the motor seat 33, a driving sprocket 34 in the chain transmission assembly is connected with the servo reduction motor 32, and a driven sprocket 35 in the chain transmission assembly is fixed on the transmission shaft 4.The servo deceleration motor 32 can drive the transmission shaft 4 to rotate through the chain transmission assembly. Since the transmission shaft 4 is connected to the fixed shaft 16 through the angular contact bearing 41, the rotation of the transmission shaft 4 will not affect the fixed shaft 16. When the lifting cylinder 151 drives the fixed shaft 16 to lift, the fixed shaft 16 can drive the transmission shaft 4 to lift together. When the transmission shaft 4 lifts, it can drive the bearing seat 31 to lift through the connecting structure between the shoulder and the bearing in the bearing seat 31. Since the bearing seat 31 is fixed on the lifting plate 3, the lifting plate 3 can lift along with the bearing seat 31 and the four guide columns 14. The servo deceleration motor 32 on the lifting plate 3 can also lift together, so that the servo deceleration motor 32, the driving sprocket 34 on the servo deceleration motor 32, and the driven sprocket 35 on the transmission shaft 4 can lift together. The servo deceleration motor 32 and the transmission shaft 4 are always connected through the chain transmission assembly. During the lifting process, the guide sleeve 121 on the support plate 12 plays a guiding role for the transmission shaft 4, and the four guide columns 14 play a guiding role for the lifting plate 3, preventing deviation during the lifting process.

[0021] A limiting sleeve 42 is sleeved on the transmission shaft 4 below the supporting plate 12, the limiting sleeve 42 is fixed on the transmission shaft 4 through the second fixing bolt, the limiting sleeve 42 can limit the rising height of the transmission shaft 4, a square block 43 is sleeved on the transmission shaft 4, a horizontally aligned connecting through hole is arranged between the square block 43 and the transmission shaft 4, a connecting shaft 5 is transversely arranged at the bottom of the transmission shaft 4, a reduced diameter screw rod is arranged on the connecting shaft 5, the reduced diameter screw rod extends out of the square block 43 after being arranged in the connecting through hole, the connecting shaft 5 abuts against the square block 43, a locking nut 44 is threadedly connected on the reduced diameter screw rod, the locking nut 44 also abuts against the square block 43, the stability of the connecting shaft 5 is improved, a shaft sleeve 51 is fixedly sleeved on the connecting shaft 5, a tool bit shaft 6 is sleeved in the shaft sleeve 51, a plurality of third fixing bolts are threadedly connected on the shaft sleeve 51, the third fixing bolts on the shaft sleeve 51 abut against the connecting shaft 5 and the tool bit shaft 6 respectively, so that the connecting shaft 5 and the tool bit shaft 6 are fixed, a spring sleeve 61, a tool holder sleeve 62 and a positioning sleeve 63 are sleeved on the tool bit shaft 6, a fourth fixing bolt is threadedly connected on the spring sleeve 61, an adjusting bolt 622 is threadedly connected on the tool holder sleeve 62, a fifth fixing bolt is threadedly connected on the positioning sleeve 63, the fourth fixing bolt and the fifth fixing bolt both abut against the tool bit shaft 6, the positioning sleeve 63 abuts against one side wall of the tool holder sleeve 62, a limiting plate 631 is sleeved on any one fifth fixing bolt of the positioning sleeve 63, the limiting plate 631 abuts against the adjusting bolt 622 on the tool holder sleeve 62, the spring sleeve 61 is located at the other side of the tool holder sleeve 62, a torsion spring 64 is arranged between the tool holder sleeve 62 and the spring sleeve 61, a cutter 621 is clamped in the tool holder sleeve 62. When the transmission shaft 4 rotates, the connecting shaft 5 and the tool bit shaft 6 can be driven to perform circumferential motion along the axis of the transmission shaft 4, the cutter 621 can perform circumferential cutting, when the cutter 621 performs circumferential cutting, the cutter 621 is slowly lowered under the torsion of the torsion spring 64, when the adjusting bolt 622 on the tool holder sleeve 62 abuts against the limiting plate 631, the cutter 621 abuts against the glass plate 2.

[0022] The glass plate 2 is placed on the round pressing plate 7, the round pressing plate 7 is circumferentially provided with a plurality of air holes 71, which can reduce the weight of the round pressing plate 7 and prevent strong air flow during pressing, and the screw rod 72 is welded at the center of the round pressing plate 7; the bottom wall of the transmission shaft 4 is movably provided with the movable shaft 45, and the connection structure between the transmission shaft 4 and the movable shaft 45 is that: the mounting hole is formed in the bottom wall of the transmission shaft 4 and penetrates the connecting hole in the transmission shaft 4, the U-shaped plate 46 is clamped in the mounting hole, the U-shaped plate 46 abuts against the reduced screw rod of the connecting shaft 5 to tighten the connecting shaft 5, further improving the stability of the connecting shaft 5, the through hole is formed in the U-shaped plate 46, a plurality of tightening screw holes are arranged on the square block 43, the tightening hole is arranged on the transmission shaft 4 and aligned with the tightening screw hole on the square block 43 and connected with the mounting hole, the sixth tightening bolt is threadedly connected in the tightening screw hole and abuts against the U-shaped plate 46 after penetrating the aligned tightening hole, so as to fix the U-shaped plate 46 in the mounting hole of the transmission shaft 4, the movable shaft 45 is T-shaped, the screw hole is arranged on the small-diameter section of the movable shaft 45, and the small-diameter section of the movable shaft 45 is movably penetrated through the through hole in the U-shaped plate 46 and threadedly connected with the screw rod 71 on the round pressing plate 7. When the transmission shaft 4 is lifted, the round pressing plate 7 can be lifted at the same time through the clamping structure between the U-shaped plate 46 and the movable shaft 45, especially when it is lowered, the round pressing plate 7 is pressed against the object to be cut, and since the movable shaft 45 still has a movement gap between the U-shaped plate 46, the transmission shaft 4 can continue to be lowered until it abuts against the round pressing plate 7, at this time, the cutter 621 abuts against the outer wall of the round pressing plate 7, and when the cutter 621 needs to be replaced, the round pressing plate 7 with the same cutting radius is threadedly connected with the screw hole on the movable shaft 45 through the screw rod 72.

[0023] In use, according to the required cutting radius, the corresponding circular pressing plate 7 is replaced and the position of the cutter 621 is adjusted, then the driving shaft 4 and the circular pressing plate 7 are driven to rise by the lifting cylinder 151, a plurality of plastic films to be cut are stacked and laid flat on the glass plate 2, then the driving shaft 4 and the circular pressing plate 7 are driven to descend by the lifting cylinder 151, the circular pressing plate 7 is pressed on the plastic film, since there are air holes 71 on the circular pressing plate 7, strong air flow will not blow on the plastic film during the pressing process to cause the plastic film to wrinkle and the film to be blown away, after the circular pressing plate 7 is pressed on the plastic film, the rubber block 131 is driven to press on the periphery of the plastic film by the pressing rod cylinder 13, then the servo deceleration motor 32 drives the driving shaft 4 to rotate through the chain transmission assembly, the driving shaft 4 drives the connecting shaft 5 and the cutter shaft 6 to rotate in a circle, the cutter 621 cuts the plastic film along the edge of the circular pressing plate 7 to make the plastic film into a circular shape, since the periphery of the plastic film is pressed by the rubber block 131, the waste cut off from the periphery during the cutting process will not affect the cutting efficiency of the cutter 621 with the rotation of the cutter 621. After the cutting is completed, the driving shaft 4, the circular pressing plate 7, the cutter 621 and the rubber block 131 are lifted to take out the waste and the circular plastic film.

[0024] In order to facilitate the staff of different height to load, the loading height needs to be adjusted according to the height of the staff, namely the height of the fixed plate 1 and the glass plate 2. In the embodiment, a lifting mechanism 8 is connected to the bottom wall of the fixed plate 1. The lifting mechanism 8 comprises an upper guide frame 81 and a lower guide frame 82. The upper guide frame 81 is fixed to the bottom wall of the fixed plate 1. Two first hinged arms 811 are hinged in the upper guide frame 81. A first guide wheel 812 is arranged on the first hinged arm 811. The first guide wheel 812 is rollingly clamped in the lower guide frame 82. A first synchronization plate 813 is arranged between the two first hinged arms 811. Two second hinged arms 821 are hinged in the lower guide frame 82. The hinged positions of the second hinged arms 821 are on the same side as the hinged positions of the first hinged arms 811. A second guide wheel 822 is arranged on the second hinged arm 821. The second guide wheel 822 is rollingly clamped in the upper guide frame 81. A second synchronization plate 823 is arranged between the two second hinged arms 821. The first hinged arm 811 is rotationally connected with the second hinged arm 821 on the same side. A cylinder seat 83 is arranged on the second synchronization plate 823 close to the rotationally connected position of the first hinged arm 811 and the second hinged arm 821. A hinged seat 84 is arranged on the first synchronization plate 813 close to the first guide wheel 812. A push cylinder 85 is hinged on the cylinder seat 83. The piston rod of the push cylinder 85 is hinged with the hinged seat 84. A locking plate 86 is rotationally arranged on any one of the first hinged arms 811. A plurality of adjusting holes 861 are arranged on the locking plate 86 at intervals. A groove plate 87 is arranged on the first hinged arm 811 and can accommodate the locking plate 86 without interfering with the movement of the first hinged arm 811 and the second hinged arm 821. A locking hole 824 is arranged on the second hinged arm 821 on the same side as the first hinged arm 811 provided with the locking plate 86. The push cylinder 85 drives the piston rod to extend, the first hinged arm 811 and the second hinged arm 821 tend to be flat and folded, and the fixed plate 1 will gradually lower the height. The push cylinder 85 drives the piston rod to retract, the first hinged arm 811 and the second hinged arm 821 tend to be unfolded and folded, and the fixed plate 1 will gradually increase the height. In this way, the height of the fixed plate 1 can be adjusted, so as to adjust the loading height. Then, any one of the adjusting holes 861 on the locking plate 86 is aligned with the locking hole 824 on the second hinged arm 821. A locking pin is arranged between the aligned adjusting hole 861 and the locking hole 824. In this way, the lifting mechanism 8 can be locked to prevent sudden drop accidents during cutting and ensure the safety of the staff.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application. Any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A round bottom bag bottom panel cutting machine that is easy to operate and can achieve high-quality cutting, including: A fixed plate, characterized in that: a glass plate is laid on the top wall of the fixed plate; several columns are evenly distributed around the circumference of the fixed plate located outside the glass plate; a support plate is connected between the columns; a guide sleeve is interference-fitted onto the support plate; a rotatable transmission shaft is movably mounted in the guide sleeve; a fixed shaft is rotatably fixed on the transmission shaft; the fixed shaft is connected to the piston rod of a lifting cylinder; the transmission shaft is connected to a drive mechanism; a cutter head shaft is horizontally placed at the bottom of the transmission shaft; a spring sleeve, a cutter holder sleeve, and a positioning sleeve are fitted on the cutter head shaft; the positioning sleeve abuts against one side wall of the cutter holder sleeve and passes through a fifth... The set bolt is fixed to the cutter head shaft. A limit plate is fitted on the fifth set bolt. An adjusting bolt is threaded onto the cutter holder sleeve. The limit plate abuts against the adjusting bolt. The spring sleeve is located on the other side of the cutter holder sleeve and is fixed to the cutter head shaft by the fourth set bolt. A torsion spring is provided between the cutter holder sleeve and the spring sleeve. A cutter is engaged in the cutter holder sleeve. A movable shaft is movably installed in the bottom wall of the drive shaft. A screw hole is provided in the movable shaft. A circular pressure plate is placed on the glass plate. A screw is welded to the center of the circular pressure plate. The screw on the circular pressure plate is threadedly connected to the screw hole in the movable shaft.

2. The round bottom bag bottom piece cutting machine according to claim 1, which is easy to operate and can achieve high-quality cutting, is characterized in that: Four guide pillars are evenly distributed around the top wall of the support plate. A lifting plate is slidably installed between the four guide pillars. The lifting plate has a through hole and a bearing seat that are coaxially aligned with the guide sleeve. The drive shaft passes through the through hole and the bearing seat in sequence. A shoulder is provided on the drive shaft. The shoulder is located between the two bearings in the bearing seat and abuts against the two bearings in the bearing seat. An mounting plate is fixedly installed between the four guide pillars. The lifting cylinder is vertically installed on the mounting plate.

3. The round bottom bag bottom piece cutting machine according to claim 2, which is easy to operate and can achieve high-quality cutting, is characterized in that: The connection structure between the fixed shaft and the transmission shaft is as follows: a reduced diameter section is provided on the transmission shaft, an angular contact bearing is fitted on the reduced diameter section, a retaining spring is clamped on the reduced diameter section located above the angular contact bearing, a bearing groove is provided on the bottom wall of the fixed shaft, the bearing groove is fitted on the angular contact bearing, and several first set bolts are evenly distributed around the side wall of the fixed shaft, the first set bolts abut against the outer ring of the angular contact bearing.

4. The round bottom bag bottom piece cutting machine according to claim 2, which is easy to operate and can achieve high-quality cutting, is characterized in that: The drive mechanism includes a chain drive assembly and a servo geared motor. A motor base is provided on the lifting plate, the servo geared motor is fixed on the motor base, the driving sprocket in the chain drive assembly is connected to the servo geared motor, and the driven sprocket in the chain drive assembly is fixed on the drive shaft.

5. The round bottom bag bottom piece cutting machine according to claim 1, which is easy to operate and can achieve high-quality cutting, is characterized in that: Several downward-facing pressure rod cylinders are evenly distributed around the bottom wall of the support plate, and rubber blocks are installed on the piston rods of the pressure rod cylinders.

6. The round bottom bag bottom panel cutting machine according to claim 1, which is easy to operate and can achieve high-quality cutting, is characterized in that: A limiting sleeve is fitted onto the drive shaft located below the support plate, and the limiting sleeve is fixed to the drive shaft by a second set bolt.

7. The round bottom bag bottom piece cutting machine according to claim 1, which is easy to operate and can achieve high-quality cutting, is characterized in that: A connecting shaft is provided on the drive shaft, and a square block is fitted on the drive shaft. A horizontally aligned connecting through hole is provided between the square block and the drive shaft. A reducing screw is provided on the connecting shaft. The reducing screw passes through the aligned connecting through hole and extends out of the square block. The connecting shaft abuts against the square block. A locking nut is threaded onto the reducing screw. The locking nut also abuts against the square block. A coupling sleeve is fitted and fixed on the connecting shaft. The cutter head shaft passes through and is fixed in the coupling sleeve. Several third set bolts are threaded onto the coupling sleeve. The third set bolts on the coupling sleeve abut against the connecting shaft and the cutter head shaft respectively.

8. The round bottom bag bottom piece cutting machine according to claim 7, which is easy to operate and can achieve high-quality cutting, is characterized in that: The connection structure between the drive shaft and the movable shaft is as follows: a mounting hole is provided on the bottom wall of the drive shaft, which is connected to the connecting through hole in the drive shaft. A C-shaped plate is installed in the mounting hole. The C-shaped plate abuts against the reduced diameter screw of the connecting shaft. A through hole is provided in the C-shaped plate. Several set screw holes are provided on the square block. A set hole is provided on the drive shaft, which is aligned with the set screw holes and connected to the mounting hole. A set bolt is threaded into the set screw hole. The set bolt passes through the aligned set hole and abuts against the C-shaped plate. The movable shaft is T-shaped. The screw hole is provided on the small diameter section of the movable shaft. The small diameter section of the movable shaft moves through the through hole in the C-shaped plate and is threadedly connected to the screw.

9. The round bottom bag bottom piece cutting machine according to claim 1, which is easy to operate and can achieve high-quality cutting, is characterized in that: Several vent holes are evenly distributed around the circumference of the circular pressure plate.

10. The round bottom bag bottom panel cutting machine according to any one of claims 1 to 9, which is easy to operate and can achieve high-quality cutting, is characterized in that: A lifting mechanism is connected to the bottom wall of the fixed plate. The lifting mechanism includes an upper guide frame and a lower guide frame. The upper guide frame is fixed to the bottom wall of the fixed plate. Two first hinged arms are hinged to the upper guide frame. A first guide wheel is provided on the first hinged arm and is tactilely engaged with the lower guide frame. A first synchronization plate is provided between the two first hinged arms. Two second hinged arms are hinged to the lower guide frame. The hinge positions of the second hinged arms are on the same side as the hinge positions of the first hinged arms. A second guide wheel is provided on the second hinged arm and is tactilely engaged with the upper guide frame. A second synchronization plate is provided between the two second hinged arms. The first articulated arm is rotatably connected to the second articulated arm on the same side. A cylinder seat is provided on the second synchronous plate near the rotatable connection between the first articulated arm and the second articulated arm. A hinge seat is provided on the first synchronous plate near the first guide wheel. A push cylinder is hinged to the cylinder seat. The piston rod of the push cylinder is hinged to the hinge seat. A locking plate is rotatably provided on any one of the first articulated arms. Several adjustment holes are provided at intervals on the locking plate. A groove plate is provided on the first articulated arm that can accommodate the locking plate and does not interfere with the movement of the first articulated arm and the second articulated arm. A locking hole is provided on the second articulated arm on the same side as the first articulated arm with the locking plate.

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