A method for controlling the shearing depth of a bag shearing machine

Abstract

The invention discloses a method for controlling the shearing depth of a paper bag shearing machine, and relates to the technical field of paper bag shearing. The method comprises the following steps: step 1: on the shearing depth and time interface on the device display screen, an operator adjusts the shearing depth of an upper knife according to paper bags of different heights, and then a PLC controller controls a servo motor to operate, so that a threaded rod drives a limit plate to slide along a guide rod, thereby limiting the downward travel distance of the upper knife; step 2: when the limit plate reaches the specified upper knife shearing depth, the PLC controller controls a hydraulic cylinder to operate, so that the upper knife shears the paper bag; step 3: when the hydraulic cylinder drives the upper and lower movements, a displacement change of a draw rope on a draw rope encoder is converted into a current signal; the invention can control the shearing depth of the upper knife according to paper bags of different heights by arranging a draw rope position encoder and adding a shearing depth and time interface on the device operation screen.

Description

Technical Field

[0001] The invention relates to the technical field of paper bag shearing, in particular to a method for controlling the shearing depth of a paper bag shearing machine. Background Art

[0002] After searching, an invention patent with Chinese patent application number CN2016100412848 was found, which discloses a fully automatic bag cutting machine, including a loading platform and an operating box. The operating box is equipped with a loading system, a bag cutting system, and a bag cutting conveying system. The loading system, the bag cutting system, and the bag cutting conveying system are connected in sequence. A waste material cart is provided on one side of the operating box, and a cleaning and filtering system is provided in the operating box. The multi-point feedback system ensures that each system operates relatively independently and in coordination with each other, greatly ensuring the bag cutting efficiency and production safety.

[0003] However, in the actual operation of the paper cutting machine, due to the different heights and strengths of the paper bags, if the maximum cutting depth is maintained, the wire will often not be cut normally. If the cutting depth is too large, it is very easy to cause the cutter to deform and the equipment to be damaged. Summary of the Invention

[0004] The object of the present invention is to provide a method for controlling the shearing depth of a bag shearing machine.

[0005] The technical problem solved by the present invention is: during the actual operation of the paper cutting machine, due to the different heights and strengths of the paper bags, if the maximum cutting depth is maintained, the wire will often not be cut normally. If the cutting depth is too large, it is very easy to cause the cutter to deform and the equipment to be damaged.

[0006] The present invention can be implemented by the following technical solution: a method for controlling the shearing depth of a bag shearing machine, the method comprising the following steps:

[0007] Step 1: On the cutting depth and time interface on the equipment display, the operator adjusts the cutting depth of the upper blade according to the different heights of the paper bales. The PLC controller then controls the servo motor to operate, causing the threaded rod to drive the limit plate to slide along the guide rod, thereby limiting the downward travel distance of the upper blade.

[0008] Step 2: When the limit plate reaches the specified upper knife cutting depth, the PLC controller controls the hydraulic cylinder to work, so that the upper knife can cut the paper bag;

[0009] Step 3: When the hydraulic cylinder drives the upper knife to move up and down, the displacement change of the rope on the rope encoder is converted into a current signal. These current signals flow into the PLC controller, and the PLC controller calculates the travel distance of the upper knife to achieve control of the travel distance of the upper knife.

[0010] A further technical improvement of the present invention is that in step one, step two and step three, the bag cutting machine includes a base, two support plates are symmetrically fixed to the top of the base, and support blocks are fixed to the top of the two support plates; a U-shaped frame is fixed to the top of the support block; a hydraulic cylinder is installed on the top of the U-shaped frame, the output rod of the hydraulic rod is fixed to rod No. 1, and the bottom end of rod No. 1 is fixed to the upper knife; a rope encoder is installed on the top inner wall of the U-shaped frame, and the rope of the rope encoder is fixed to the front end of the knife holder of the upper knife.

[0011] A further technical improvement of the present invention is that: a guide rod is fixedly connected between the U-shaped frame and the support block, a fixed plate is sleeved on the outside of the guide rod, and one side of the fixed plate is fixed to the No. 1 rod; a threaded rod is rotatably connected to the lower side of the top of the U-shaped frame, and the threaded rod is driven by a servo motor, and a limit plate is also sleeved on the outside of the threaded rod, and the guide rod passes through and is slidably connected to the limit plate.

[0012] The further technical improvement of the present invention is that: a sliding groove is provided at the bottom of the support block, a double-headed screw is rotatably connected in the sliding groove, one end of the double-headed screw is sleeved and fixedly connected to the No. 1 bevel gear, and the end of the threaded rod located in the sliding groove is sleeved and fixedly connected to the No. 2 bevel gear, and the No. 1 bevel gear and the No. 2 bevel gear are in a meshing state; sliders are sleeved at both ends of the double-headed screw, and the sliders are slidably connected in the sliding groove; a cleaning block is fixedly connected to the bottom of the slider; a through groove is provided on one side of the cleaning block, and a brush is fixedly connected to the inner wall of the through groove.

[0013] A further technical improvement of the present invention is that a cleaning rod and a collecting groove are fixedly connected to the support plate on one side close to the cleaning block, and the collecting groove is located below the cleaning rod, and the bottom of the cleaning rod is flush with the bottom inner wall of the through groove.

[0014] A further technical improvement of the present invention is that: a straight rod is hinged to the top inner wall of the slide, a spring is fixed to one side of the straight rod, and the other end of the spring is fixed to the top inner wall of the slide; the two sliders are fixed to an L-shaped plate on the side close to each other, and the L-shaped plate is located above the double-headed screw.

[0015] A further technical improvement of the present invention is that a stacked air bag is fixedly connected to the cleaning block on one side close to the support plate, a plurality of air jet holes are opened on the inner wall of the through groove, and the air jet holes are communicated with the stacked air bag.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, by setting a pull rope position encoder and adding an interface for cutting depth and time on the equipment operation screen, the cutting depth of the upper knife can be controlled according to the different heights of paper bags, avoiding the deformation of props and damage to equipment when the hydraulic cylinder is working under full stroke conditions. At the same time, the success rate of cutting the iron wire for binding paper bags is improved and the labor intensity of operators is reduced.

[0018] 2. In the present invention, the threaded rod is driven to rotate by a servo motor, and the threaded rod drives the limit plate to slide along the guide rod, thereby controlling the downward movement distance of the fixed plate, and further controlling the travel distance of the upper knife, thereby achieving double protection for the travel distance of the lower knife and reducing the risk of damage or failure of the rope encoder.

[0019] 3. In the present invention, when the servo motor drives the threaded rod to rotate, the double-headed screw will drive the two sliders to slide in the slide groove, thereby causing the two cleaning blocks to move away from or towards each other. The cleaning blocks can be used to clean the debris on the upper knife surface, avoiding debris remaining on the upper knife surface and affecting the use effect of the tool, which is beneficial to improving the service life of the tool.

[0020] 4. In the present invention, when the cleaning block moves toward the cleaning rod, the top of the slider will hit the straight rod, causing the straight rod to rotate, and then the straight rod will be located at the top of the slider. At the same time, as the slider continues to move, the straight rod will leave the top of the slider. At this time, due to the elastic force of the spring, the straight rod will hit one side of the L-shaped plate, which will have a vibrating effect on the entire slider and the cleaning block, and can make the debris on the inner wall of the through groove fall to the bottom of the through groove. At this time, it is convenient for the cleaning rod to clean the debris at the bottom of the through groove out of the through groove and drop it into the collection groove, reducing the accumulation of debris inside the through groove, which is beneficial to improving the cleaning effect of the brush on the upper knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0022] Figure 1 is a flow chart of the method of the present invention;

[0023] Figure 2 It is a partial cross-sectional structural diagram of the bag cutting machine in the present invention;

[0024] Figure 3 For the present invention Figure 1 A partial enlarged view of point A in the middle.

[0025] In the figure: 1. Wire-pull encoder; 2. Base; 3. Support plate; 4. Support block; 5. U-shaped frame; 7. Rod No. 1; 8. Upper knife; 9. Guide rod; 10. Fixed plate; 11. Threaded rod; 12. Limit plate; 13. Slide groove; 14. Double-headed screw; 15. Bevel gear No. 1; 16. Bevel gear No. 2; 17. Slider; 18. Cleaning block; 19. Through groove; 20. Brush; 21. Cleaning rod; 22. Collecting trough; 23. Straight rod; 24. Spring; 25. L-shaped plate; 26. Stacked airbag; 27. Jet hole. DETAILED DESCRIPTION

[0026] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0027] See also Figure 1-Figure 3 As shown, a method for controlling the shearing depth of a bag cutting machine is provided. The method comprises installing a drawstring encoder 1 on the bag cutting machine. The drawstring for detection is fixed to the front end of the knife holder of the upper knife 8 by welding and screwing. The movement distance of the upper knife 8 is controlled by the displacement change of the drawstring. The displacement change of the drawstring is connected to the AI ​​module of the PLC controller via a 4-20mA current signal. The travel distance of the upper knife 8 is calculated by the program within the PLC controller. In addition, an interface for shearing depth and time is added to the display screen of the on-site equipment. The operator can control the shearing depth of the upper knife 8 according to the height of the paper bag, thereby avoiding deformation of the props and damage to the equipment when the hydraulic cylinder is working under full stroke conditions. At the same time, the success rate of shearing the iron wire binding the paper bag is improved and the labor intensity of the operator is reduced.

[0028] The method comprises the following steps:

[0029] Step 1: On the cutting depth and time interface on the equipment display, the operator adjusts the cutting depth of the upper blade 8 according to the different heights of the paper bales. The PLC controller then controls the servo motor to operate, causing the threaded rod 11 to drive the limit plate 12 to slide along the guide rod 9, thereby limiting the downward travel distance of the upper blade 8.

[0030] Step 2: When the limit plate 12 reaches the specified cutting depth of the upper knife 8, the PLC controller controls the hydraulic cylinder to work, so that the upper knife 8 can cut the paper bag;

[0031] Step 3: When the hydraulic cylinder drives the upper and lower movements, the displacement change of the rope on the rope encoder 1 is converted into a current signal. These current signals flow into the PLC controller, and the PLC controller calculates the travel distance of the upper knife 8 to realize the control of the travel distance of the upper knife 8.

[0032] The frame of the bag shearing machine is mainly composed of a base 2, a support plate 3, a support block 4 and a U-shaped frame 5. The two support plates 3 are symmetrically fixed to the top of the base 2, and the support block 4 is fixed to the top of the support plate 3; the U-shaped frame 5 is in an inverted state, and the U-shaped frame 5 is fixed to the top of the support block 4; a hydraulic cylinder is installed on the top of the U-shaped frame 5, and the output rod of the hydraulic cylinder is fixed to the No. 1 rod 7, the bottom end of the No. 1 rod 7 passes through and is slidably connected to the support plate 3, and the bottom end of the No. 1 rod 7 is fixed with an upper knife 8, and the rope encoder 1 is installed on the top inner wall of the U-shaped frame 5; in order to guide the No. 1 rod 7, a guide rod 9 is fixed between the U-shaped frame 5 and the support plate 3, and the outer sleeve of the guide rod 9 is provided with a fixing plate 10, and one side of the fixing plate 10 is fixed to the No. 1 rod 7;

[0033] In order to further control the travel distance of the upper knife 8, a threaded rod 11 is rotatably connected to the lower side of the top of the U-shaped frame 5. The bottom end of the threaded rod 11 is located in the cavity inside the support block 4. A limit plate 12 is also sleeved on the outside of the threaded rod 11. The guide rod 9 also passes through the limit plate 12, and the guide rod 9 and the limit plate 12 are in a sliding fit state; a servo motor is installed on the top of the U-shaped frame 5, and the output shaft of the servo motor is connected to the top of the threaded rod 11; the servo motor is also controlled by a PLC controller, which controls the operation of the servo motor so that the servo motor drives The movable threaded rod 11 rotates, and the threaded rod 11 drives the limit plate 12 to slide along the guide rod 9, thereby controlling the downward movement distance of the fixed plate 10, and further controlling the travel distance of the upper knife 8. The shearing depth of the upper knife 8 can be controlled according to the paper bags of different heights, thereby avoiding the deformation of the props and damage to the equipment when the hydraulic cylinder is working under the full stroke working condition, and at the same time improving the shearing success rate of the paper bag binding wire and reducing the labor intensity of the operator; a knife-out position is provided on the guide rod 9, and the hydraulic cylinder drives the upper knife 8 to move downward only when the limit plate 12 is above the knife-out position;

[0034] A chute 13 is provided at the bottom of the support block 4, in which a double-headed screw 14 is rotatably connected. The double-headed screw 14 is sleeved on the end close to the threaded rod 11 and fixedly connected to a first bevel gear 15. The end of the threaded rod 11 located in the chute 13 is sleeved on and fixedly connected to a second bevel gear 16. The first bevel gear 15 and the second bevel gear 16 are in a meshing state. Slide blocks 17 are sleeved on both ends of the double-headed screw 14, and the slide blocks 17 are also slidably connected to the chute 13. A cleaning block 18 is fixedly connected to the bottom of the slide block 17. When the threaded rod 11 drives the second bevel gear 16 to rotate, the second bevel gear 16 will drive the first bevel gear 15 to rotate, which will drive the double-headed screw 14 to rotate, and the double-headed screw 14 will drive the two sliders 17 to slide in the slide groove 13, thereby causing the two cleaning blocks 18 to move in opposite directions or towards each other, and the cleaning blocks 18 can clean the debris on the surface of the upper knife 8, avoiding debris remaining on the surface of the upper knife 8 and affecting the use effect of the knife, which is beneficial to improving the service life of the knife;

[0035] A through slot 19 is formed on one side of the cleaning block 18, and a brush 20 is fixedly connected to the inner wall of the through slot 19. The area of ​​the brush 20 is smaller than the surface area of ​​the through slot 19, and the brush 20 is used to clean the debris on the surface of the upper knife 8.

[0036] A cleaning rod 21 and a collecting groove 22 are fixedly connected to the support plate 3 on one side close to the cleaning block 18, and the collecting groove 22 is located below the cleaning rod 21. The bottom of the cleaning rod 21 is flush with the bottom inner wall of the through groove 19. When the cleaning block 18 moves toward the cleaning rod 21, the cleaning rod 21 will clean the debris at the bottom of the through groove 19 out of the through groove 19 and drop it into the collecting groove 22, thereby reducing the accumulation of debris inside the through groove 19 and improving the cleaning effect of the brush 20 on the upper knife 8.

[0037] The spring 24 is coupled to the top of the slider 17 so that the slider 17 can move in a direction opposite to the top of the slider 17. The spring 24 is coupled to the top of the slider 17 so that the slider 17 can move in a direction opposite to the top of the slider 17. The spring 24 is coupled to the top of the slider 17 so that the slider 17 can move in a direction opposite to the top of the slider 17.

[0038] The cleaning block 18 is further fixed with a stacked airbag 26 on one side close to the support plate 3. An air jet hole 27 is formed on the inner wall of the through groove 19, and the air jet hole 27 is in communication with the stacked airbag 26. When the cleaning block 18 moves toward the support plate 3, the stacked airbag 26 is compressed, and the gas inside the stacked airbag 26 is ejected from the air jet hole 27, thereby preventing the gas from being adsorbed on the inner wall of the through groove 19 and improving the cleaning effect of the debris on the inner wall of the through groove 19.

[0039] When the present invention is in use, after the operator adjusts the shearing depth of the upper knife 8, the PLC controller controls the servo motor to work, so that the servo motor drives the threaded rod 11 to rotate, and the threaded rod 11 drives the limit plate 12 to slide along the guide rod 9, so that the limit plate 12 moves upward from the bottom end of the guide rod 9 to the knife-out position on the surface of the guide rod 9. In this process, the threaded rod 11 drives the second bevel gear 16 to rotate, which will cause the second bevel gear 16 to drive the first bevel gear 15 to rotate, so that the first bevel gear 15 drives the double-headed screw 14 to rotate, so that the double-headed screw The screw 14 drives the two sliders 17 to slide in the slide groove 13, thereby causing the two cleaning blocks 18 to move in opposite directions, and the two cleaning blocks 18 will separate from the upper knife 8. When the two cleaning blocks 18 move in opposite directions, the cleaning blocks 18 can clean the debris on the surface of the upper knife 8 to avoid debris remaining on the surface of the upper knife 8 and affecting the use effect of the tool; as the servo motor continues to drive the threaded rod 11 to rotate, the limit plate 12 will continue to move upward along the guide rod 9 and reach a position to limit the downward travel distance of the upper knife 8, thereby achieving the upper The distance traveled by the knife 8 is further controlled; and in this process, the double-headed screw 14 continues to drive the two sliders 17 to move in opposite directions, causing the top of the slider 17 to hit the straight rod 23, causing the straight rod 23 to rotate, and then the straight rod 23 will be located at the top of the slider 17. At the same time, as the slider 17 continues to move, the straight rod 23 will leave the top of the slider 17. At this time, due to the elastic force of the spring 24, the straight rod 23 will hit one side of the L-shaped plate 25, which will vibrate the entire slider 17 and the cleaning block 18, which can make The debris on the inner wall of the through groove 19 falls to the bottom of the through groove 19. At this time, the cleaning rod 21 is convenient to clean the debris at the bottom of the through groove 19 out of the through groove 19 and drop it into the collecting trough 22, reducing the accumulation of debris inside the through groove 19, which is conducive to improving the cleaning effect of the brush 20 on the upper knife 8; and when the cleaning block 18 moves toward the support plate 3, the stacked air bag 26 will be compressed, and then the gas inside the stacked air bag 26 will be ejected from the jet hole 27, avoiding adsorption on the inner wall of the through groove 19, thereby improving the cleaning effect of the debris on the inner wall of the through groove 19.

[0040] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for controlling the shearing depth of a bag shearing machine, characterized in that: The method comprises the following steps: Step 1: On the cutting depth and time interface on the device display, the operator adjusts the cutting depth of the upper knife (8) according to the different heights of the paper bags, and then the PLC controller controls the servo motor to operate, so that the threaded rod (11) drives the limit plate (12) to slide along the guide rod (9), thereby limiting the downward travel distance of the upper knife (8); Step 2: When the limit plate (12) reaches the specified cutting depth of the upper knife (8), the PLC controller controls the hydraulic cylinder to operate so that the upper knife (8) can cut the paper bag; Step 3: When the hydraulic cylinder drives the upper and lower movements, the displacement change of the rope on the rope encoder (1) is converted into a current signal, and these current signals flow into the PLC controller, which calculates the travel distance of the upper knife (8) and realizes the control of the travel distance of the upper knife (8); In step 1, step 2 and step 3, the bag cutting machine includes a base (2), two support plates (3) are symmetrically fixed to the top of the base (2), and the tops of the two support plates (3) are fixed to support blocks (4); the tops of the support blocks (4) are fixed to a U-shaped frame (5); a hydraulic cylinder is installed on the top of the U-shaped frame (5), the output rod of the hydraulic cylinder is fixed to a No. 1 rod (7), and the bottom end of the No. 1 rod (7) is fixed to an upper knife (8); the drawstring encoder (1) is installed on the top inner wall of the U-shaped frame (5), and the drawstring of the drawstring encoder (1) is fixed to the front end of the knife holder of the upper knife (8); A guide rod (9) is fixedly connected between the U-shaped frame (5) and the support block (4); a fixed plate (10) is sleeved on the outside of the guide rod (9); one side of the fixed plate (10) is fixedly connected to the No. 1 rod (7); a threaded rod (11) is rotatably connected to the lower side of the top of the U-shaped frame (5), and the threaded rod (11) is driven by a servo motor. A limit plate (12) is also sleeved on the outside of the threaded rod (11), and the guide rod (9) passes through and is slidably connected to the limit plate (12).

2. A method for controlling the shearing depth of a bag shearing machine according to claim 1, characterized in that: The bottom of the support block (4) is provided with a slide groove (13), a double-headed screw (14) is rotatably connected in the slide groove (13), one end of the double-headed screw (14) is sleeved and fixedly connected to a first bevel gear (15), one end of the threaded rod (11) located in the slide groove (13) is sleeved and fixedly connected to a second bevel gear (16), and the first bevel gear (15) and the second bevel gear (16) are in a meshing state; sliders (17) are sleeved at both ends of the double-headed screw (14), and the sliders (17) are slidably connected in the slide groove (13); a cleaning block (18) is fixedly connected to the bottom of the slider (17); a through groove (19) is provided on one side of the cleaning block (18), and a brush (20) is fixedly connected to the inner wall of the through groove (19).

3. The method for controlling the shearing depth of a bag shearing machine according to claim 1, wherein: The support plate (3) is fixedly connected to a cleaning rod (21) and a collecting groove (22) on one side close to the cleaning block (18), and the collecting groove (22) is located below the cleaning rod (21). The bottom of the cleaning rod (21) is flush with the bottom inner wall of the through groove (19).

4. A method for controlling the shearing depth of a bag shearing machine according to claim 2, characterized in that: The top inner wall of the slide groove (13) is hinged with a straight rod (23), one side of the straight rod (23) is fixed with a spring (24), and the other end of the spring (24) is fixed to the top inner wall of the slide groove (13); the two sliders (17) are fixed with an L-shaped plate (25) on the side close to each other, and the L-shaped plate (25) is located above the double-headed screw (14).

5. The method for controlling the shearing depth of a bag shearing machine according to claim 2, wherein: The cleaning block (18) is also fixedly connected to a stacked air bag (26) on one side close to the support plate (3); the inner wall of the through groove (19) is provided with a plurality of air jet holes (27), and the air jet holes (27) are communicated with the stacked air bag (26).

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