A precision cutting machine

Abstract

The loading and unloading device is close to the cutter and comprises a loading mechanism for placing the paper tube, a lifting frame with an inclined upper end surface and used for conveying the paper tube, a limiting frame connected to the lifting frame and used for receiving the limited paper tube, a loading frame located at the outlet of the limiting frame and conveying the paper tube to the main machine, and a conveying mechanism located on the side of the loading frame away from the limiting frame and used for conveying the paper tube, a first lifting mechanism is provided between the lifting frame and the loading mechanism, a second lifting mechanism is provided between the limiting frame and the loading frame, and the loading frame comprises a fixed part and a rotating part provided close to one side of the conveying mechanism and rotatably connected to the fixed part, the rotating part rotates upward and forms a tube groove between the fixed part, a tube pushing plate is movably connected in the tube groove to push the paper tube to the main machine side, and the rotating part conveys the paper tube in the tube groove to the conveying mechanism when it rotates downward.

Description

Technical Field

[0001] The invention relates to pipe processing equipment, in particular to a precision cutting machine. Background Art

[0002] Paper tube cutting machine is a commonly used equipment in the paper tube processing process, which is used to cut paper tubes into required lengths.

[0003] During the paper tube production process, paper tubes need to be cut into small sections. When loading the existing cutting machine, manual loading is required, which is inefficient and easy to hurt the hands. In addition, since the cutting time is relatively fast, if the paper tubes are loaded one by one, there will be time gaps in between, which will waste time and reduce work efficiency. In addition, when unloading, the cut paper tubes need to be sorted, which consumes manpower.

[0004] Patent application number CN201710226052.4 is an automatic loading and unloading paper tube cutting machine, including a machine base, a drive chamber, a rotating shaft and a cutting device. The rotating shaft also includes a loading and unloading device and a conveying device. The loading and unloading device includes a moving mechanism, a lifting mechanism and a clamping mechanism. The conveying device includes a support plate, a third motor, a driving wheel, a driven wheel and a belt. The automatic loading and unloading paper tube cutting machine continuously conveys the paper tube to the bottom of the clamping ring through the conveying device. The lifting mechanism drives the clamping ring to descend to the paper tube. The clamping mechanism drives the clamping ring to clamp the paper tube. Finally, the moving mechanism drives the clamping ring to clamp the paper tube and insert it into the rotating shaft. After cutting is completed, the clamping ring clamps the section of paper tube closest to the drive chamber. The clamping ring is moved to push all the paper tubes out of the rotating shaft. This automatic loading and unloading method uses the moving mechanism to clamp the paper tube for loading and unloading, which greatly prolongs the loading and unloading time of a single paper tube, greatly reduces the cutting efficiency of the paper tube, and can only be used for one cutting, which greatly increases the processing cost and is inefficient. Summary of the Invention

[0005] The present invention aims to solve the problems existing in the above-mentioned prior art and provide a precision cutting machine which is safer to operate and reduces labor intensity, and at the same time has high loading and unloading efficiency, thereby improving processing efficiency and greatly reducing processing costs.

[0006] The present invention solves its technical problem by adopting a technical solution: this precision cutting machine includes a main machine for cutting paper tubes, a loading and unloading device for feeding paper tubes into the main machine, the main machine is provided with a cutter, the loading and unloading device is close to the cutter side, the loading and unloading device includes a loading mechanism for placing paper tubes, a lifting frame with an inclined upper end surface and used for conveying paper tubes, a limiting frame connected to the lifting frame and used for receiving the limited paper tubes, a loading frame located at the outlet of the limiting frame and conveying paper tubes to the main machine, and a conveying mechanism located on the side of the loading frame away from the limiting frame for conveying paper tubes, the lifting frame and the loading mechanism A first lifting mechanism is provided between the mechanisms to lift the paper tube on the loading mechanism to the lifting frame, and a second lifting mechanism is provided between the limit frame and the loading frame to lift the paper tube on the limit frame to the loading frame. The loading frame includes a fixed part arranged near one side of the limit frame and a rotating part arranged near one side of the conveying mechanism and rotatably connected to the fixed part. The rotating part rotates upward and forms a tube groove for supporting the paper tube with the fixed part. A tube pushing plate for pushing the paper tube to the side of the main machine is movably connected in the tube groove. When the rotating part rotates downward, it conveys the paper tube in the tube groove to the conveying mechanism.

[0007] Preferably, the fixed part includes a first support frame, left and right support seats arranged on the left and right sides of the first support frame, and a first guide plate arranged between the left and right support seats and parallel to the axial direction of the paper tube. The rotating part is provided with a second guide plate, and the second guide plate is rotatably connected between the left and right support seats through a rotating shaft. The lower end of the second guide plate is provided with a telescopic cylinder that drives the second guide plate to rotate around the rotating shaft. When the telescopic cylinder is extended, it drives the second guide plate to rotate, so that the second guide plate and the first guide plate form a "V"-shaped tube groove.

[0008] Preferably, a guide rail located at the lower end of the first guide plate is fixedly connected between the left and right support seats, a first sliding sleeve is slidably connected to the outer side of the guide rail, a pushing cylinder installed in the first support frame is fixedly connected to the first sliding sleeve, the pushing cylinder is used to drive the first sliding sleeve to move, a connecting part is installed on the push tube plate, a sliding cavity for moving the connecting part is provided between the first guide plate and the second guide plate, the connecting part passes through the sliding cavity and is fixedly connected to the first sliding sleeve.

[0009] Preferably, the head and tail ends of the pushing cylinder are respectively equipped with a second sliding sleeve that is slidably connected to the outside of the guide rail, and the outside of the second sliding sleeve is provided with a locking sleeve that is slidably connected to the guide rail. The locking sleeve is provided with a threaded hole that passes through the locking sleeve, and the threaded hole is threaded with a screw that is in extrusion contact with the outer surface of the guide rail.

[0010] Preferably, the lifting frame includes a second supporting frame and an inclined surface arranged at the upper end of the second supporting frame, and the inclined surface is connected to the limiting frame and is arranged to be inclined downward toward the limiting frame.

[0011] Preferably, the first lifting mechanism includes two upper and lower rotating shafts rotatably connected to the second support frame, sprockets are fixedly connected to the outer sides of the upper and lower rotating shafts respectively, and chain belts are provided on the outer sides of the upper and lower sprockets. A material hook for lifting the paper tube on the lifting frame is fixedly connected to the chain belt on the side away from the sprocket, and a process hole for the material hook to pass through is provided on the inclined surface.

[0012] Preferably, the limiting frame includes a guide portion connected to the upper end of the lifting frame, and the guide portion is provided with a plurality of limiting portions inclined toward the fixed portion and used to limit the paper tube. The limiting portion is installed with a guide portion. When the second lifting mechanism lifts the paper tube 2 out of the limiting portion 2-3-2, the guide portion 2-3-3 guides the paper tube 3 into the tube groove.

[0013] Preferably, the second lifting mechanism includes a plurality of lifting cylinders installed at the lower end of the guide portion, and the guide portion is provided with a plurality of passage holes corresponding to the piston ends of the lifting cylinders.

[0014] Preferably, a clamping device is provided on the side of the loading rack close to the main machine to prevent the paper tube from moving up and down. The clamping device includes a second support frame arranged at the upper end of the loading rack, a clamping cylinder installed on the second support frame, and a limiting rotating seat installed at the piston end of the clamping cylinder for limiting the up and down movement of the paper tube. The limiting rotating seat includes a base plate fixedly connected to the piston end of the clamping cylinder, and a roller arranged to contact the outer surface of the paper tube is rotatably connected to the side of the base plate close to the paper tube.

[0015] Preferably, the main machine includes a clamping head that can clamp the paper tube and drive the paper tube to rotate or move horizontally, and a cutting part that cuts the paper tube. The clamping head includes a third support frame arranged along the axial direction of the paper tube and a sliding seat slidably connected to the third support frame through a sliding mechanism. The sliding seat is rotatably connected to the side close to the paper tube to clamp the end of the paper tube and drive the paper tube to rotate. The cutting part is located between the clamping device and the clamping head. The cutting part includes a movable seat installed at the front and rear ends of the paper tube, the cutter is rotatably connected to the movable seat, and the lower end of the movable seat is equipped with a screw transmission mechanism arranged along the radial direction of the paper tube.

[0016] The beneficial effect of the present invention is that: the present invention is provided with a loading mechanism for storing and placing multiple paper tubes, and the paper tubes can be lifted into the lifting rack in turn by the first lifting mechanism, and the paper tubes in the lifting rack roll into the limiting rack under the action of gravity, and the paper tubes on the limiting rack are lifted into the loading rack in turn by the second lifting mechanism to realize fast and sustainable loading, and the paper tubes in the loading rack are quickly pushed to the side of the main machine and cut by the tube pushing plate, and the cut paper tubes are quickly rolled out of the loading rack under the action of the second guide plate of the loading rack to realize fast unloading, and finally sent out through the conveying mechanism. During the loading and unloading process, when the main machine completes cutting the paper tube, it can immediately cut the next paper tube rolled into the loading rack, and the loading and unloading efficiency is high, thereby ensuring the high cutting efficiency of the paper tubes, and correspondingly greatly reducing the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 for Figure 1 Enlarged view of part D in the middle;

[0019] Figure 3 It is a structural diagram of the loading mechanism, lifting frame, limiting frame and loading frame;

[0020] Figure 4 for Figure 3 Enlarged view of part A;

[0021] Figure 5 This is the right side view of the loading mechanism, lifting frame, limiting frame and loading frame;

[0022] Figure 6 It is a structural diagram of the fixed part;

[0023] Figure 7 for Figure 6 Enlarged view of part B;

[0024] Figure 8 It is a structural diagram of the lifting frame and the limiting frame;

[0025] Figure 9 It is an enlarged view of part C;

[0026] Figure 10 This is a schematic diagram of the host structure.

[0027] Explanation of the accompanying symbols: 1. Cutter, 2. Paper tube, 3. Main machine, 2-1. Loading mechanism, 2-2. Lifting frame, 2-3. Limiting frame, 2-4. Loading frame, 2-5. Conveying mechanism, 2-6. Fixed part, 2-7. Rotating part, 4. Push tube plate, 2-6-1. First support frame, 2-6-2. Left and right support seats, 2-6-3. First guide plate, 2-7-1. Second guide plate, 2-7-2. Telescopic cylinder, 2-8. Guide rail, 2-9. First sliding sleeve, 2-10. Push cylinder, 6. Sliding chamber, 7. Second sliding sleeve, 8. Locking Sleeve, 9. threaded hole, 10. screw, 2-2-1. second support frame, 2-2-2. inclined surface, 11. rotating shaft, 12. sprocket, 13. chain belt, 14. material hook, 15. process hole, 2-3-1. guide part, 2-3-2. limit part, 2-3-3. guide part, 15. lifting cylinder, 16. channel hole, 17. second support frame, 18. clamping cylinder, 19. bottom plate, 20. roller, 21. third support frame, 22. sliding seat, 23. three-jaw chuck, 24. movable seat, 25. screw transmission mechanism, 26. center support tube. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings:

[0029] Refer to the attached Figure 1 and 3 : In this embodiment, a precision cutting machine includes a main machine 3 for cutting a paper tube 2, a loading and unloading device for feeding the paper tube 2 into the main machine 3, the main machine 3 is provided with a cutter 1, the loading and unloading device is close to the cutter 1 side, the loading and unloading device includes a loading mechanism 2-1 for placing the paper tube 2, a lifting frame 2-2 with an inclined upper end surface and used for conveying the paper tube 2, a limiting frame 2-3 connected to the lifting frame 2-2 and used for receiving the limited paper tube, a loading frame 2-4 located at the outlet of the limiting frame 2-3 and conveying the paper tube 2 to the main machine 3, and a conveying mechanism 2-5 located on the side of the loading frame 2-4 away from the limiting frame 2-3 for conveying the paper tube 2, and the conveying mechanism 2-5 can be a conveyor belt driven by a motor;

[0030] Refer to the attached Figure 3 As shown, the lifting frame 2-2 includes a second support frame 2-2-1 and an inclined surface 2-2-2 arranged at the upper end of the second support frame 2-2-1, connected to the limit frame 2-3 and inclined toward the limit frame 2-3. The second support frame 2-2-1 is used to support the fixed inclined surface 2-2-2. A first lifting mechanism is provided between the lifting frame 2-2 and the loading mechanism 2-1 to lift the paper tube 2 on the loading mechanism 2-1 to the lifting frame 2-2. The loading mechanism 2-1 can be a "U"-shaped frame assembled by multiple profiles, and in order to facilitate the first lifting mechanism to lift the paper tube 2, the bottom of the "U"-shaped frame can be inclined toward the first lifting mechanism.

[0031] Refer to the attached Figure 8 and 9 As shown, the first lifting mechanism includes two upper and lower rotating shafts 11 rotatably connected to the second support frame 2-2-1, and both ends of the rotating shaft 11 are rotatably connected to the second support frame 2-2-1 through bearings and bearing seats. Sprockets 12 are fixedly connected to the outer sides of the upper and lower rotating shafts 11 respectively, and chain belts 13 are provided on the outer sides of the upper and lower sprockets 12. A material hook 14 for lifting the paper tube 2 on the lifting frame 2-2 is fixedly connected to the chain belt 13 on the side away from the sprocket 12. One of the rotating shafts 11 is connected to the motor through a transmission mechanism, so that the rotating shaft 11 is driven to rotate by the motor. The transmission mechanism can be a chain drive or a belt drive. When in use, the corresponding rotating shaft 11 is driven to rotate by the motor, and then the chain belt 13 drives the outer material hook 14 to roll cyclically, as shown in FIG. Figure 9 As shown, the material hook 14 can be a square tube. The side of the square tube close to the chain belt 13 can be fixed to the chain belt 13 by welding. The square tube is tilted on the outside of the chain belt 13. When the chain belt 13 drives the square tube to move upward, the square tube is tilted upward relative to the chain belt 13. An angle for limiting the paper tube is formed between the square tube and the chain belt 13, so that the paper tube 2 on the loading mechanism 2-1 is stuck in the angle and is lifted up by the square tube to move upward. In order to avoid interference between the inclined surface 2-2-2 and the material hook 14, a process hole 15 for the material hook 14 to pass through is provided on the inclined surface 2-2-2.

[0032] Refer to the attached Figure 8As shown, a second lifting mechanism is provided between the limiting frame 2-3 and the loading frame 2-4 to lift the paper tube 2 on the limiting frame 2-3 to the loading frame 2-4. The limiting frame 2-3 includes a guide portion 2-3-1 connected to the upper end of the lifting frame 2-2. The second lifting mechanism includes several lifting cylinders 15 installed at the lower end of the guide portion 2-3-1. The guide portion 2-3-1 is provided with several channel holes 16 corresponding to the piston ends of the lifting cylinders 15. The guide portion 2-3-1 is provided with several limiting portions 2-3-2 inclined toward the upper material frame 2-4 and used to limit the paper tube 2. The limiting portion 2-3-2 is provided with a guide portion 2-3-3. The limiting portion 2-3-2 is provided with a guide portion 2-3-3. When the second lifting mechanism lifts the paper tube 2 out of the limiting portion 2-3-2, the guide portion 2-3-3 guides the paper tube 3 into the tube groove. The paper tube 2 passes through the inclined surface 2-2- 2 The rear guide part 2-3-1 rolls on one side and is limited to the right side of the limiting part 2-3-2. In order to facilitate the adjustment of the inclination angle of the guide part 2-3-1, the guide part 2-3-1 can be connected to the inclined surface 2-2-2 by a hinge. The lower end of the guide part 2-3-1 is connected with a height adjustment mechanism installed on the second support frame 2-3-1. In this embodiment, the limiting part 2-3-2 is a first tube body welded on the guide part 2-3-1 and tilted from bottom to top toward the upper material rack 2-4. The guide part 2-3-3 is a second tube body welded on the tube body and extended to the upper material rack 2-4. The second tube body is tilted toward the upper material rack 2-4. The paper tube 2 limited to the right side of the first tube body is lifted upward by the lifting cylinder 15 until the paper tube 2 is lifted above the first tube body. Then, the paper tube 2 separates from the first tube body and rolls to the upper end of the second tube body, and rolls to the upper material rack 2-4 under the guidance of the second tube body.

[0033] Refer to the attached Figure 3-6As shown, the loading rack 2-4 includes a fixed part 2-6 arranged near one side of the limiting rack 2-3 and a rotating part 2-7 arranged near one side of the conveying mechanism 2-5 and rotatably connected to the fixed part 2-6, wherein the fixed part 2-6 includes a first support frame 2-6-1, left and right support seats 2-6-2 arranged on the left and right sides of the first support frame 2-6-1, and a first guide plate 2-6-3 arranged between the left and right support seats 2-6-2 and parallel to the axial direction of the paper tube 2. The first support frame 2-6-1 is a rectangular support frame assembled by profiles, and the left and right support seats 2-6-2 are installed at both ends of the long side of the rectangular support frame. The rotating part 2-7 is provided with a second guide plate 2-7-1, and the second guide plate 2-7-1 is rotatably connected to the left and right support seats through a rotating shaft. Between the seats 2-6-2, a telescopic cylinder 2-7-2 is provided at the lower end of the second guide plate 2-7-1, which drives the second guide plate 2-7-1 to rotate around the rotating shaft. The piston end of the telescopic cylinder 2-7-2 is rotatably connected to the lower end surface of the second guide plate 2-7-1. The lower end of the telescopic cylinder 2-7-2 is fixedly installed and can be installed on the first support frame 2-6-1. When the piston end of the telescopic cylinder 2-7-2 is extended, it drives the second guide plate 2-7-1 to rotate upward, so that the second guide plate 2-7-1 and the first guide plate 2-6-3 form a "V"-shaped pipe groove. When the piston end of the telescopic cylinder 2-7-2 is shortened, it drives the second guide plate 2-7-1 to rotate toward the side of the transport mechanism 2-5, and the paper tube dropped from the second tube body falls into the "V"-shaped pipe groove;

[0034] Refer to the attached Figure 6 As shown, a tube push plate 4 is movably connected in the tube groove for pushing the paper tube 2 toward one side of the main machine 3. A guide rail 2-8 located at the lower end of the first guide plate 2-6-3 is fixedly connected between the left and right support seats 2-6-2. A first sliding sleeve 2-9 is slidably connected to the outer side of the guide rail 2-8. A pushing cylinder 2-10 installed in the first support frame 2-6-1 is fixedly connected to the first sliding sleeve 2-9. The pushing cylinder 2-10 is used to drive the first sliding sleeve 2-9 to move. In this embodiment, the guide rail 2-8 is a cylindrical guide rod, and in order to make the tube push plate 4 movable It is more stable. There are two guide rods. The first sliding sleeve 2-9 is a slide located on the outside of the guide rod. The slides are fixedly connected with plates by screws. The piston end of the push cylinder 2-10 is fixed on the plate. The push cylinder 2-10 is fixedly connected to the slide through the plate. A connecting part 5 is installed on the push tube plate 4. A sliding cavity 6 for moving the connecting part is provided between the first guide plate 2-6-3 and the second guide plate 2-7-1. The connecting part 5 passes through the sliding cavity 6 and is fixedly connected to the first sliding sleeve 2-9. The connecting part 5 is also connected to the slide through the above-mentioned plate.

[0035] Preferably, refer to the attached Figure 7As shown, the head and tail ends of the pushing cylinder are respectively equipped with a second sliding sleeve 7 that is slidably connected to the outside of the guide rail 2-8, and the outside of the second sliding sleeve 7 is provided with a locking sleeve 8 that is slidably connected to the guide rail 2-8. In this embodiment, the second sliding sleeve 7 is also a slide, and two corresponding slides are also provided. A plate is also fixedly connected between the slides by screws. The head and tail ends of the pushing cylinder 2-10 are fixed to the plate, and the locking sleeve 8 can be a sleeve that is slidably connected to the outside of the guide rail 2-8. In order to make the pushing cylinder 2-10 lockable and secure A threaded hole 9 is provided on the locking sleeve 8 and passes through the locking sleeve 8. The threaded hole 9 is internally threaded with a screw 10 that is in squeeze contact with the outer surface of the guide rail 2-8. When processing paper tubes of different lengths, the screw 10 can be loosened first to adjust the pushing cylinder 2-10 and the corresponding pushing tube plate 4 to a position close to the main machine 3, and then the screw 10 can be tightened to make the screw 10 squeeze contact and fix with the guide rod, thereby locking and fixing the position of the pushing cylinder 2-10 so that the pushing cylinder 2-10 itself will not move when working.

[0036] Refer to the attached Figure 1 and 2 As shown, a clamping device for preventing the paper tube 2 from moving up and down is provided on the side of the loading rack 2-4 close to the main machine 3. The clamping device includes a second support frame 17 arranged at the upper end of the loading rack 2-4, a clamping cylinder 18 installed on the second support frame 17, and a limit rotating seat installed at the piston end of the clamping cylinder 18 for limiting the up and down movement of the paper tube 2. In this embodiment, the second support frame 17 is a gantry bracket assembled by profiles, and the gantry bracket is fixedly connected to a mounting seat plate by screws, and the clamping cylinder 18 is installed on the gantry bracket through the mounting seat plate; the limit rotating seat includes a base plate 19 fixedly connected to the piston end of the clamping cylinder 18, and the side of the bottom plate 19 close to the paper tube 2 is rotatably connected to a roller 20 that is arranged in contact with the outer surface of the paper tube 2. In this embodiment, two rollers 20 are provided, which are respectively arranged on the front and rear sides of the upper end of the paper tube 2 and are arranged in contact with the outer surface of the paper tube 2, thereby cooperating with the "V"-shaped tube groove to clamp the paper tube 2, and at the same time can reduce the friction between the paper tube 2 and the paper tube 2.

[0037] Refer to the attached Figure 1 and 10As shown, the main machine 3 includes a clamping head that can clamp the paper tube 2 and drive the paper tube 2 to rotate or move horizontally, and a cutting part for cutting the paper tube 2. The clamping head includes a third support frame 21 arranged along the axial direction of the paper tube 2 and a sliding seat 22 slidably connected to the third support frame 21 through a sliding mechanism. In this embodiment, the third support frame 21 can also be a rectangular bracket assembled by profiles, and a guide rail is installed on the upper end of the rectangular bracket. The sliding seat 22 is slidably connected to the guide rail through a slider. The sliding seat 22 is rotatably connected to the side close to the paper tube with a three-jaw chuck 23 that clamps the end of the paper tube 2 and drives the paper tube to rotate; preferably, a central support tube 26 for supporting the paper tube 2 is provided at the center position of the inner side of the three-jaw chuck 23. The three-jaw chuck 23 can be a pneumatic rotary three-jaw chuck, and a pulley is fixedly connected to the outer side of the three-jaw chuck 23. A rotating motor is installed on the upper end surface of the sliding seat 22. The output end of the rotating motor drives the pulley on the outer side of the three-jaw chuck 23 to rotate through a belt, thereby rotating the three-jaw chuck 23;

[0038] The cutting part is located between the clamping device and the clamping head. The cutting part includes a movable seat 24 installed at the front and rear ends of the paper tube 2. The cutter 1 is rotatably connected to the movable seat 24. A screw transmission mechanism 25 arranged along the radial direction of the paper tube 2 is installed at the lower end of the movable seat 24. In this embodiment, the screw transmission mechanism 25 is installed perpendicular to the paper tube 2 on the third bracket 21, and the movable seats 24 at the front and rear ends are installed on the outside of the screw of the same screw transmission mechanism 25. A screw nut installed outside the screw is fixed in the movable seat 24. The threads at the front and rear ends of the corresponding screw are set in opposite directions, so that when the screw rotates, the front and rear movable seats 24 can drive the cutter 1 to move closer to or away from the paper tube 2. When in use, the paper tubes 2 on the loading rack 2-4 are all pushed toward the side of the main machine 3 by the tube pushing plate 4, so that the paper tube 2 is close to the main machine 3. One end near the main machine 3 is sleeved on the outside of the central support tube 26 and is clamped and fixed by the claws on the three-jaw chuck 23. At the same time, the sliding seat 22 drives the paper tube 2 to move to the left on the third support frame 21 until part of the paper tube 2 remains on the loading rack 2-4. The front and rear two movable seats 24 drive the cutter 1 to move toward the middle paper tube 2 to cut the paper tube 2, cut off the uneven part of the tail end of the paper tube 2, and then move the sliding seat 22 to the right so that the paper tube 2 of the corresponding size is located at the upper end of the loading rack 2-4. The cutting operation is repeated to cut the paper tube 2 of the corresponding size. At this time, the second guide plate 2-7-1 rotates downward under the action of the telescopic cylinder 2-7-2, and the cut paper tube 2 rolls along the second guide plate 2-7-1 to the conveying mechanism 2-5 under the action of gravity, and is transported to the next workstation along the conveying mechanism 2-5.

[0039] Certain terms are used throughout the specification and claims of this invention to refer to specific products. Those skilled in the art will understand that manufacturers may refer to the same component by different names. This document does not intend to distinguish between components that have the same function but are named differently. In the following description and claims, the words "comprising," "having," and "including" are open-ended and should be interpreted as meaning "including, but not limited to..."

[0040] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A precision cutting machine, comprising a main machine (3) for cutting a paper tube (2), a loading and unloading device for feeding the paper tube (2) into the main machine (3), the main machine (3) being provided with a cutter (1), the loading and unloading device being close to the cutter (1), the loading and unloading device comprising a loading mechanism (2-1) for placing the paper tube (2), a lifting frame (2-2) with an upper end face inclined and used for conveying the paper tube (2), a limiting frame (2-3) connected to the lifting frame (2-2) and used for receiving the limited paper tube, a loading frame (2-4) located at an outlet of the limiting frame (2-3) and conveying the paper tube (2) to the main machine (3), and a conveying mechanism (2-5) located on a side of the loading frame (2-4) away from the limiting frame (2-3) and used for conveying the paper tube (2), wherein the machine is characterized in that: A first lifting mechanism is provided between the lifting frame (2-2) and the loading mechanism (2-1) for lifting the paper tube (2) on the loading mechanism (2-1) onto the lifting frame (2-2); a second lifting mechanism is provided between the limiting frame (2-3) and the loading frame (2-4) for lifting the paper tube (2) on the limiting frame onto the loading frame (2-4); the loading frame (2-4) comprises a fixed portion (2-6) arranged near one side of the limiting frame (2-3) and a rotating portion (2-7) arranged near one side of the conveying mechanism (2-5) and rotatably connected to the fixed portion (2-6); the rotating portion (2-7) rotates upward and forms a tube groove for supporting the paper tube (2) between the rotating portion (2-7) and the fixed portion (2-6); a tube pushing plate (4) is movably connected in the tube groove for pushing the paper tube (2) toward one side of the main machine (3); and when the rotating portion (2-7) rotates downward, it conveys the paper tube (2) in the tube groove to the conveying mechanism (2-5).

2. A precision cutting machine according to claim 1, characterized in that: The fixed portion (2-6) comprises a first support frame (2-6-1), left and right support seats (2-6-2) arranged on the left and right sides of the first support frame (2-6-1), and a first guide plate (2-6-3) arranged between the left and right support seats (2-6-2) and parallel to the axial direction of the paper tube (2); the rotating portion (2-7) is provided with a second guide plate (2-7-1); the second guide plate (2-7-1) is rotatably connected between the left and right support seats (2-6-2) via a rotating shaft; a telescopic cylinder (2-7-2) is provided at the lower end of the second guide plate (2-7-1) for driving the second guide plate (2-7-1) to rotate around the rotating shaft; when the telescopic cylinder (2-7-2) is extended, it drives the second guide plate (2-7-1) to rotate, so that the second guide plate (2-7-1) and the first guide plate (2-6-3) form a "V"-shaped tube groove.

3. A precision cutting machine according to claim 2, characterized in that: A guide rail (2-8) located at the lower end of the first guide plate (2-6-3) is fixedly connected between the left and right support seats (2-6-2), a first sliding sleeve (2-9) is slidably connected to the outer side of the guide rail (2-8), a pushing cylinder (2-10) installed in the first support frame (2-6-1) is fixedly connected to the first sliding sleeve (2-9), and the pushing cylinder (2-10) is used to drive the first sliding sleeve (2-9) to move. A connecting portion (5) is installed on the push tube plate (4), and a sliding cavity (6) for moving the connecting portion is provided between the first guide plate (2-6-3) and the second guide plate (2-7-1), and the connecting portion (5) passes through the sliding cavity (6) and is fixedly connected to the first sliding sleeve (2-9).

4. A precision cutting machine according to claim 3, characterized in that: The first and second ends of the push cylinder (2-10) are respectively provided with a second sliding sleeve (7) slidably connected to the outside of the guide rail (2-8); the outside of the second sliding sleeve (7) is provided with a locking sleeve (8) slidably connected to the guide rail (2-8); the locking sleeve (8) is provided with a threaded hole (9) penetrating the locking sleeve (8); the threaded hole (9) is internally threadedly connected to a screw (10) that is in extrusion contact with the outer surface of the guide rail (2-8).

5. A precision cutting machine according to claim 1, characterized in that: The lifting frame (2-2) comprises a second supporting frame (2-2-1) and an inclined surface (2-2-2) arranged at the upper end of the second supporting frame (2-2-1); the inclined surface (2-2-2) is connected to the limiting frame (2-3) and is arranged to be inclined downward toward the limiting frame (2-3).

6. A precision cutting machine according to claim 5, characterized in that: The first lifting mechanism comprises two upper and lower rotating shafts (11) rotatably connected to the second support frame (2-2-1), sprockets (12) are fixedly connected to the outer sides of the upper and lower rotating shafts (11), and chain belts (13) are provided on the outer sides of the upper and lower sprockets (12). A material hook (14) for lifting the paper tube (2) on the lifting frame (2-2) is fixedly connected to the chain belt (13) on the side away from the sprocket (12), and a process hole for the material feed hook (14) to pass through is provided on the inclined surface (2-2-2).

7. A precision cutting machine according to any one of claims 1 to 6, characterized in that: The limiting frame (2-3) includes a guide portion (2-3-1) connected to the upper end of the lifting frame (2-2); the guide portion (2-3-1) is provided with a plurality of limiting portions (2-3-2) inclined toward the upward material frame (2-4) and used to limit the paper tube (2); the limiting portion (2-3-2) is installed with a guide portion (2-3-3); when the second lifting mechanism lifts the paper tube (2) away from the limiting portion (2-3-2), the guide portion (2-3-3) guides the paper tube (2) into the tube groove.

8. A precision cutting machine according to claim 7, characterized in that: The second lifting mechanism comprises a plurality of lifting cylinders (15) mounted on the lower end of the guide portion (2-3-1), and the guide portion (2-3-1) is provided with a plurality of channel holes (16) corresponding to the piston ends of the lifting cylinders (15).

9. A precision cutting machine according to claim 1, characterized in that: The side of the loading rack (2-4) close to the main machine (3) is provided with a clamping device for preventing the paper tube (2) from moving up and down, the clamping device comprising a second support frame (17) arranged at the upper end of the loading rack (2-4), a clamping cylinder (18) installed on the second support frame (17), and a limiting rotating seat installed at the piston end of the clamping cylinder (18) for limiting the upward and downward movement of the paper tube (2), the limiting rotating seat comprising a bottom plate (19) fixedly connected to the piston end of the clamping cylinder (18), and a roller (20) arranged to contact the outer surface of the paper tube (2) being rotatably connected to the side of the bottom plate (19) close to the paper tube (2).

10. A precision cutting machine according to claim 9, characterized in that: The main machine (3) comprises a clamping head capable of clamping the paper tube (2) and driving the paper tube (2) to rotate or move horizontally, and a cutting portion for cutting the paper tube (2). The clamping head comprises a third support frame (21) arranged along the axial direction of the paper tube (2) and a sliding seat (22) slidably connected to the third support frame (21) through a sliding mechanism. The sliding seat (22) is rotatably connected to a three-jaw chuck (23) on a side close to the paper tube for clamping and fixing the end of the paper tube (2) and driving the paper tube to rotate. The cutting portion is located between the clamping device and the clamping head. The cutting portion comprises a movable seat (24) installed at the front and rear ends of the paper tube (2). The cutter (1) is rotatably connected to the movable seat (24). The lower end of the movable seat (24) is equipped with a screw transmission mechanism (25) arranged along the radial direction of the paper tube (2).

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