Working method of a new roll changing device

Abstract

The present invention discloses a working method of a novel roll-changing device, comprising the following steps: (1) assembling a reeling bar assembly; (2) hoisting an artificial leather product; (3) placing the artificial leather product on a removable reeling rack; (4) reeling the product on the online reeling rack; (5) reeling; (6) pushing out the empty reeling bar assembly; (7) separating the core shaft of the reeling bar assembly from the bar body; (8) pushing the product roll on the removable reeling rack forward onto the online reeling rack; (9) repeating step (1) for standby use. The present invention has a scientific principle, a novel design, and a more coherent and smooth production process. In particular, it improves on the existing reeling bar assembly, and can prevent radial runout and axial movement of the core shaft during reeling, especially during high-speed operation, reduce wear of the core shaft, ensure tension stability, and reduce labor intensity.

Description

Technical Field

[0001] The invention belongs to the technical field of PVC calendered artificial leather production, and particularly relates to a working method of a novel roll changing device. Background Art

[0002] During the production of PVC calendered artificial leather products in different steps, the products are wound around the bar body 1 of the unwinding bar, and when the next step is unwinding, Figure 1 As shown, the core shaft 2 is inserted into the bar body 1 of the unwinding bar, and the upper end of the support frame 3 is rotatably provided with two support rollers 4 spaced apart in front and back. The annular grooves 6 at both ends of the core shaft 2 are rotatably provided between the two support rollers 4. Under the action of the rear power traction, it passively rotates to unfold the artificial leather product. Precision cast steel bar heads 5 are welded at both ends of the inner hole of the bar body 1 of the unwinding bar. The bar head 5 is an outer circle and inner square structure. The outer end of the inner hole of the bar head 5 is a trumpet mouth, which is convenient for the core shaft 2 to penetrate into the inside of the bar head 5. The core shaft 2 penetrates into the bar body 1, and the part corresponding to the bar head 5 is also a square structure. The outer square section of the core shaft 2 is gap-matched with the inner square hole of the bar head 5. During the unwinding process, the core shaft 2 also rotates. The shortcomings of the existing unwinding bar device are as follows:

[0003] 1). The outer side of the core shaft 2 and the inner square hole of the lever head 5 are in a clearance fit. Especially after a period of use, the gap between the inner square hole of the lever head 5 and the outer side of the core shaft 2 becomes larger due to wear. When unwinding at high speed, it will jump (the unwinding lever jumps relative to the core shaft), resulting in unstable unwinding tension. In order to ensure the winding tension in the second half, a manual brake wheel is generally installed on the outside of the core shaft 2 on the support frame 3. After using the brake wheel to increase the tension, the winding can be completed. However, the problem of unstable tension still cannot be solved. If the tension is too small, the winding uniformity is poor, and if the tension is too large, thin and soft products will be narrowed.

[0004] 2) In order to facilitate the extraction of the core shaft 2 from the rod body 1 of the unwinding lever during reel change, no axial limiting mechanism is provided. As a result, there is axial movement between the core shaft 2 and the rod body 1 of the unwinding lever, which further aggravates the wear of the contact section between the outer square section of the core shaft 2 and the inner square hole of the rod head 5.

[0005] 3). The core shaft 2 is supported on two supporting rollers 4, which will also cause axial movement.

[0006] 4). After unwinding, the core shaft 2 and the rod body 1 cannot be lifted by the crane and need to be lifted away from the production line by manpower, which is labor-intensive and unsafe. Summary of the Invention

[0007] In order to solve the deficiencies in the prior art, the present invention provides a working method for a novel roll changing device which avoids radial runout and axial movement during the unwinding process, has low labor intensity, high safety and improved work efficiency.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solution: a working method of a new roll changing device, comprising the following steps:

[0009] (1) The outer surface of the hollow bar body is wrapped with artificial leather, the core shaft is inserted into the bar body, and the core shaft and the bar body are assembled into one body through two sets of radial positioning mechanisms to form an unwinding bar assembly;

[0010] (2) The driving hook is hung at both ends of the core shaft, and the artificial leather product wrapped around the outside of the unwinding bar assembly is hoisted onto the removable unwinding rack, and then the artificial leather product wrapped around the outside of the unwinding bar assembly is moved to the online unwinding rack on the front side;

[0011] (3) The crane hoists the next roll of artificial leather products onto the removable unwinding rack for standby use;

[0012] (4) Unwinding the product on the online unwinding rack;

[0013] (5) After unwinding is completed, the first section of the product roll on the unwinding rack can be moved out and connected to the tail section of the product on the line unwinding rack to perform the roll changing operation;

[0014] (6) The flip-type pushing mechanism automatically pushes the empty unwinding bar assembly to the left and right horizontal bar feeding mechanisms in front of the online unwinding frame, and the left and right horizontal bar feeding mechanisms transport the unwinding bar assembly to the left or right to the bar receiving trolley;

[0015] (7) Separate the core shaft of the unwinding lever assembly from the lever body.

[0016] (8) Push the spare product roll on the removable unwinding rack forward to the two sliding flip roller devices on the online unwinding rack;

[0017] (9) Repeat step (1), and then hoist the product roll of the assembled unwinding bar assembly onto the removable unwinding rack for use.

[0018] The removable unwinding frame includes a support frame with a travel wheel at the bottom, two sliding and flipping roller devices of the same structure and respectively arranged at the upper part of the left and right ends of the support frame, an unwinding bar assembly is arranged horizontally in the left and right directions, the outer circle of the left end of the unwinding bar assembly is rotatably connected to the top of the sliding and flipping roller device on the left side through a left axial positioning structure, and the outer circle of the right end of the unwinding bar assembly is rotatably connected to the top of the sliding and flipping roller device on the right side through a right axial positioning structure, and the left and right horizontal feeding bar mechanisms are arranged at the upper front part of the support frame;

[0019] The sliding and flipping roller device includes a cylinder, a push-pull rod, a horizontal track, a sliding frame, a front support wheel, a rear support wheel, a limit support and a limit push rod. The horizontal track is arranged on the support frame in the left and right directions, and the bottom of the sliding frame is slidably connected to the horizontal track. The front support wheel and the rear support wheel are rotatably connected to the sliding frame. The front support wheel and the rear support wheel have the same height and are arranged at intervals front and back. The cylinder, push-pull rod and limit push rod are all arranged in the front and back directions. The rear end of the cylinder body is arranged on the upper left side of the support frame through a hinge support, the front end of the push-pull rod is fixedly connected to the upper rear side of the sliding frame, and the rear end of the push-pull rod is hinged to the front end of the piston rod of the cylinder. The rear end of the limit push rod is fixedly connected to the lower front part of the sliding frame, and the position of the push-pull rod is higher than the limit push rod in the height direction. The front ends of the limit push rods of the two sliding flip roller devices are connected by a linkage shaft horizontally arranged along the left and right directions. The limit support is fixed on the front side of the support frame, and the rear side of the limit support is provided with a semicircular groove with a rear open side, and the semicircular groove corresponds to the front and rear ends of the linkage shaft; an axial positioning block is provided on the linkage shaft, which contacts the right side of the left limit support and the left side of the right limit support; the top surface of the support frame is tilted with the rear higher and the front lower, and the top surface of the support frame extends from the back to the front to the top of the rear support wheel.

[0020] Hollow bar heads are welded to the left and right ends of the inner hole of the bar body, the core shaft is coaxially installed in the bar body, and an annular groove is provided on the outer circles of the left and right ends of the core shaft respectively. Two sets of radial positioning mechanisms are respectively arranged between the left end of the core shaft and the left bar head and between the right end of the core shaft and the right bar head; the two annular grooves have the same structure and are symmetrically arranged on the left and right sides. The bottom of the left annular groove includes the outer circle of the convex arc surface on the left and the outer circle of the cylindrical surface on the right. The outer diameter of the outer circle of the cylindrical surface is smaller than the minimum outer diameter of the outer circle of the convex arc surface;

[0021] The left axial positioning structure and the right axial positioning structure are identical and symmetrically arranged on the left and right; the left axial positioning structure includes the concave arc outer circle of the front support wheel and the rear support wheel on the left and the convex arc outer circle, and the convex arc outer circle on the core shaft is rollingly connected with the concave arc outer circle of the front support wheel and the rear support wheel.

[0022] The two sets of radial positioning mechanisms have the same structure and are symmetrically arranged on the left and right sides; the left and right ends of the lever heads have the same structure and are symmetrically arranged on the left and right sides; the radial positioning mechanism on the left side includes a bearing, a tightening sleeve, a round nut and a clamp-type retaining ring. The inner hole of the left end lever head is a circular hole section, a conical section with a larger left portion and a smaller right portion, and a square hole section from left to right. The outer square section on the core shaft is clearance-matched with the square hole section. The clamp-type retaining ring is coaxially installed on the outer circle of the cylindrical surface of the left annular groove. The outer circle of the bearing is interference-fitted on the circular hole section of the lever head. The circle is a tapered hole that is larger on the left and smaller on the right. The adapter sleeve is coaxially installed on the outer circle of the core shaft on the right side of the clamp-type retaining ring. The adapter sleeve is provided with an expansion joint along the axial direction. The right side of the outer circle of the adapter sleeve is a conical surface that is larger on the left and smaller on the right. The conical surface of the adapter sleeve is coaxially assembled in the tapered hole of the inner circle of the bearing. The left side of the outer circle of the adapter sleeve is an external thread. The round nut is threadedly connected to the external thread on the left side of the adapter sleeve. The left end of the round nut is press-fitted with the right end face of the clamp-type retaining ring, and the conical surface of the adapter sleeve is press-fitted with the tapered hole of the inner circle of the bearing.

[0023] The left and right horizontal bar mechanisms are roller conveyors, which include a number of rubber rollers spaced apart in the left-right direction. The tops of the rubber rollers are lower than the top of the front side of the support frame. A rubber pad is laid on the upper part of the frame of the roller conveyor. The vertical cross-section of the rubber pad along the front-to-back direction is groove-shaped. The rear edge of the rubber pad is connected to the front edge of the support frame. The bottom of the rubber pad is provided with a through hole corresponding to each rubber roller. The middle top of each rubber roller protrudes upward from the through hole and is located inside the rubber pad.

[0024] The left side of the left sliding frame and the right side of the right sliding frame are both connected to a stop rod through a pin shaft. The distance from the pin shaft to the upper end of the stop rod is smaller than the distance from the pin shaft to the lower end of the stop rod. A counterweight block is provided at the lower end of the stop rod. The stop rod is located in front of the core shaft. A limit block is fixed on the support frame. When the sliding frame slides and contacts, it contacts the front side of the limit block at the rear side of the lower end of the stop rod.

[0025] The specific process of step (1) is as follows: 1) install the two bearings into the circular hole sections of the two ends of the left and right ends of the lever body 1;

[0026] 2) Insert the core shaft into the rod body, and ensure that the outer square section of the core shaft fits the inner square hole of the rod head;

[0027] 3) Put the left end adapter sleeve onto the left end of the mandrel and push it from left to right to the tapered hole on the inner circle of the bearing. Then put the round nut onto the left end of the mandrel and push it from left to right to the external thread on the left side of the adapter sleeve. Turn the round nut clockwise until the round nut approaches the bearing. Then lock the two halves of the clamp-type retaining ring (the two-half structure is connected by a bolt assembly) on the outer circle of the cylindrical surface of the annular groove. Rotate the round nut counterclockwise until the round nut contacts the right end face of the clamp-type retaining ring. Continue to rotate the round nut counterclockwise. The round nut and the clamp-type retaining ring press against each other, the expansion gap of the adapter sleeve is reduced, and the adapter sleeve moves to the right and is pressed into the bearing.

[0028] 4) Follow the same steps as in step 3) to press the right adapter sleeve into the right bearing to complete the assembly of the core shaft and lever body.

[0029] The specific process of step (2) is as follows: the unwinding bar assembly and the artificial leather product wrapped around the outer circle of the bar are hoisted onto the left sliding frame and the right sliding frame, the convex arc outer circle of the annular groove at the end of the core shaft is rollingly connected with the concave arc outer circle of the front support wheel and the rear support wheel, and then the brake wheels are mounted on both ends of the core shaft outside the support frame.

[0030] The specific processes of step (3) and step (8) are: the top surface of the removable unwinding frame is connected with the top surface of the online unwinding frame, and is inclined with the rear higher and the front lower. The annular grooves at both ends of the core shaft on the removable unwinding frame are manually rolled forward slowly along the top surface of the removable unwinding frame and the top surface of the online unwinding frame until the convex arc outer circle of the bottom of the annular groove at the end of the core shaft is rolled and connected with the concave arc outer circle of the front support wheel and the rear support wheel on the online unwinding frame and then stop.

[0031] The specific process of step (6) is as follows: the two cylinders on the front and rear sides are started at the same time, the piston rods of the two cylinders extend synchronously, and the sliding frame is driven to move forward along the horizontal slide through the push-pull rod until the linkage shaft at the front end of the limit push rod moves into the semicircular groove of the limit support. The piston rod of the cylinder continues to extend. Since the height of the push-pull rod is higher than the limit push rod, the driving frame rotates upward with the center line of the linkage shaft as the axis, and the sliding frame moves upward and leaves the horizontal slide. As the rear end of the sliding frame rises, the height of the rear support wheel gradually becomes higher than the height of the front support wheel. The roller conveyor is activated, and all rubber rollers rotate synchronously, transporting the shaft and bar to the designated position. The cylinder's piston rod then retracts, and the carriage pivots downward and backward, pivoting on the linkage shaft until it lands on the horizontal slideway. The piston rod then retracts, pulling the carriage backward until the vertical bar, which holds the carriage in place, contacts the stopper.

[0032] The specific process of step (7) is as follows: 1) remove the brake wheel (this step is a routine operation); 2) remove the two clamp-type retaining rings; 3) turn the round nut clockwise to push the adapter sleeve out of the bearing for a while. There is a gap between the conical hole of the inner circle of the bearing and the conical surface of the outer circle of the adapter sleeve. Take out the round nut and the adapter sleeve along the axial direction of the core shaft; 4) pull out the core shaft from the rod body and send the core shaft to the next roll of product for reuse.

[0033] By adopting the above technical solution, the outer circle of the bar head in the present invention is turned, holes are dug at the left and right ends of the bar body based on the outer circle of the bar head, the two bar heads are installed and welded on the rear end face, and then the circular hole section of the inner circle of the bar head is turned out on a lathe (shortening the length of the original bell mouth), ensuring the concentricity of the circular hole section relative to the core shaft.

[0034] A round nut is used to press the adapter sleeve into the bearing. The conical surface of the outer circle of the adapter sleeve is tightly fixed to the conical hole of the inner circle of the bearing, which fundamentally eliminates the gap between the square hole section of the lever body and the outer square section of the core shaft, ensuring that the lever body does not jump or move relative to the core shaft during unwinding, and ensuring stability and tension stability during high-speed unwinding.

[0035] The convex arc outer circle on the core shaft of the axial positioning structure is rollingly connected with the concave arc outer circle of the front support wheel and the rear support wheel, which has good axial positioning and prevents the core shaft from axially moving relative to the support wheel.

[0036] As the product roll is released, its weight becomes lighter and lighter, while the spindle's speed increases. To prevent the spindle from being pulled forward by the product and moving forward away from the front and rear support wheels, a stop bar is provided. The rear side of the lower end of the stop bar is restricted by a limit block, which prevents the spindle from moving forward and maintains good stability. A counterweight is placed at the lower end of the stop bar. When the sliding frame returns to its original position from top to bottom, the stop bar can always remain in a vertical position, ensuring that the lower end of the stop bar is always in front of the limit block and does not touch the limit block.

[0037] The specific process of step (5) in the present invention is as follows: about one minute before the roll on the online unwinding stand is finished, a section of the roll to be unwound on the movable unwinding stand is manually unwound and led to the flattening roller. When only about two meters of the roll on the online unwinding stand is left, the manually unwound section is sent over the flattening roller. In this way, the tail of the roll on the online unwinding stand will bring the head of the roll on the movable unwinding stand into the laminating area of ​​the laminating device, and then the PVC film peeled off from the lower roller will also enter the laminating area, realizing the lamination of the next roll. After the lamination is completed, a layer of PVC film is applied to the semi-finished product of the previous process, and the semi-finished product enters the cooling machine for cooling and shaping. After cooling and shaping, the semi-finished product is wound into a large roll with a diameter of about 1 meter by the winder and transferred to the next process. Step (5) is a conventional operation in this field.

[0038] In summary, the present invention has a scientific principle, a novel design, and a more coherent and smooth production process. In particular, it improves on the basis of the existing unwinding bar assembly. During unwinding, especially at high speeds, it can prevent the core shaft from radially jumping and axially moving, which not only reduces the wear of the core shaft, but also ensures the stability of the tension and improves the quality of artificial leather products. After unwinding is completed, the empty bar can be automatically pushed forward (pushed out) onto the roller conveyor and transported to the designated position by the roller conveyor, thereby reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural diagram of the unwinding lever assembly in the prior art;

[0040] Figure 2 It is a left side view of the present invention in the unwinding state;

[0041] Figure 3 It is a left side view of the present invention when an empty bar is pressed;

[0042] Figure 4 yes Figure 2 Right side view of the middle unwinding lever assembly;

[0043] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0044] Figure 6 yes Figure 4 An enlarged view of the middle bar head;

[0045] Figure 7 yes Figure 6 Left view of;

[0046] Figure 8 yes Figure 4 Schematic diagram of loosening the round nut;

[0047] Figure 9 This is a disassembled structural diagram of the unwinding lever assembly. DETAILED DESCRIPTION

[0048] like Figures 1-9 As shown, a working method of a novel roll changing device of the present invention comprises the following steps:

[0049] (1) The outer surface of the hollow rod body 1 is wrapped with artificial leather, the core shaft 2 is inserted into the rod body 1, and the core shaft 2 and the rod body 1 are assembled into one body through two sets of radial positioning mechanisms to form an unwinding rod assembly 8;

[0050] (2) The driving hook is hung at both ends of the core shaft 2, and the artificial leather products wrapped around the outside of the two sets of unwinding bar assemblies 8 are hoisted onto the two sliding flip roller devices of the online unwinding rack and the removable unwinding rack (not shown), and the online unwinding rack is located in front of the removable unwinding rack;

[0051] (3) Place the artificial leather product on the unwinding rack that can be removed;

[0052] (4) Unwinding the product on the online unwinding rack;

[0053] (5) After unwinding is completed, the first section of the product roll on the unwinding rack can be moved out and connected to the tail section of the product on the line unwinding rack to perform the roll changing operation;

[0054] (6) The flip-type pushing mechanism automatically pushes the empty unwinding bar assembly 8 to the left and right horizontal bar feeding mechanisms 9 on the front side of the online unwinding frame, and the left and right horizontal bar feeding mechanisms 9 transport the unwinding bar assembly 8 to the left or right to the bar receiving trolley;

[0055] (7) Separate the core shaft 2 of the unwinding lever assembly 8 from the lever body 1.

[0056] (8) Push the product roll on the removable unwinding rack forward to the two sliding flip roller devices on the online unwinding rack;

[0057] (9) Repeat step (1), and then hoist the product roll of the assembled unwinding bar assembly 8 onto a removable unwinding rack for standby use.

[0058] The removable unwinding frame includes a support frame 7 with a bottom portion 41, two sliding flip roller devices having the same structure and being respectively provided at the upper portion of the left and right ends of the support frame 7, an unwinding bar assembly 8 being arranged horizontally in the left and right directions, the outer circle of the left end portion of the unwinding bar assembly 8 being rotatably connected to the top of the sliding flip roller device on the left side via a left axial positioning structure, and the outer circle of the right end portion of the unwinding bar assembly 8 being rotatably connected to the top of the sliding flip roller device on the right side via a right axial positioning structure, and left and right horizontal feed bar mechanisms 9 being provided at the upper front portion of the support frame 7;

[0059] The sliding and flipping roller device includes a cylinder 10, a push-pull rod 24, a horizontal rail 25, a sliding frame 26, a front support wheel 27, a rear support wheel 28, a limit support 29 and a limit push rod 30. The horizontal rail 25 is arranged on the support frame 7 in the left and right directions, and the bottom of the sliding frame 26 is slidably connected to the horizontal rail 25. The front support wheel 27 and the rear support wheel 28 are rotatably connected to the sliding frame 26. The front support wheel 27 and the rear support wheel 28 have the same height and are arranged at intervals in front and back. The cylinder 10, the push-pull rod 24 and the limit push rod 30 are all arranged in the front and back directions. The rear end of the cylinder body of the cylinder 10 is arranged on the upper left side of the support frame 7 through a hinge support 31. The front end of the push-pull rod 24 is fixedly connected to the upper rear side of the sliding frame 26, the rear end of the push-pull rod 24 is hinged to the front end of the piston rod of the cylinder 10, and the rear end of the limit push rod 30 is fixedly connected to the lower front side of the sliding frame 26 The push-pull rod 24 is positioned higher in height than the limit rod 30. The front ends of the limit rods 30 of the two sliding and flipping roller devices are connected by a linkage shaft 32 arranged horizontally in the left and right directions. The limit support 29 is fixed to the front side of the support frame 7. The rear side of the limit support 29 is provided with a semicircular groove 33 with a rear opening. The semicircular groove 33 corresponds to the front and rear ends of the linkage shaft 32. The linkage shaft 32 is provided with axial positioning blocks (not shown) that contact the right side of the left limit support 29 and the left side of the right limit support 29. The axial positioning blocks can limit the axial position of the linkage shaft 32, preventing the two sliding frames 26 from causing left and right displacement, ensuring a good sliding connection with the horizontal track 25. The top surface of the support frame 7 is tilted, with the rear surface higher than the front surface, and the top surface of the support frame 7 extends from the back to the front to the top of the rear support wheel 28. The bottom of the support frame 7 is provided with a running wheel 41 to facilitate movement to adjust the position of the unwinding bar assembly 8.

[0060] A hollow lever head 5 is welded to both ends of the inner hole of the lever body 1, and the core shaft 2 is coaxially installed in the lever body 1. An annular groove 6 is provided on the outer circle of the left and right ends of the core shaft 2, and two sets of radial positioning mechanisms are respectively arranged between the left end of the core shaft 2 and the left lever head 5 and between the right end of the core shaft 2 and the right lever head 5; the two annular grooves 6 have the same structure and are symmetrically arranged on the left and right. The bottom of the left annular groove 6 includes a convex arc surface outer circle 11 on the left and a cylindrical surface outer circle 12 on the right. The outer diameter of the cylindrical surface outer circle 12 is smaller than the minimum outer diameter of the convex arc surface outer circle 11;

[0061] The left axial positioning structure and the right axial positioning structure are identical and symmetrically arranged on the left and right; the left axial positioning structure includes the concave arc outer circle 13 of the front support wheel 27 and the rear support wheel 28 on the left side and the convex arc outer circle 11, and the convex arc outer circle 11 on the core shaft 2 is rollingly connected with the concave arc outer circle 13 of the front support wheel 27 and the rear support wheel 28.

[0062] The two sets of radial positioning mechanisms have the same structure and are symmetrically arranged on the left and right; the lever heads 5 at the left and right ends have the same structure and are symmetrically arranged on the left and right; the radial positioning mechanism on the left side includes a bearing 14, a tightening sleeve 15, a round nut 16 and a clamp-type retaining ring 17. The inner hole of the lever head 5 at the left end is, from left to right, a circular hole section 18, a conical section 19 that is larger on the left and smaller on the right, and a square hole section 20. The outer square section on the core shaft 2 is clearance-matched with the square hole section 20. The clamp-type retaining ring 17 is coaxially installed on the outer circle 12 of the cylindrical surface of the left annular groove 6. The outer circle of the bearing 14 is interference fitted in the circular hole section 18 of the lever head 5. The inner circle of the bearing 14 is larger on the left and smaller on the right. The adapter sleeve 15 has a small tapered hole 21, and the adapter sleeve 15 is coaxially installed on the outer circle of the core shaft 2 on the right side of the clamp-type retaining ring 17. The adapter sleeve 15 has an expansion joint 22 along the axial direction. The right side of the outer circle of the adapter sleeve 15 is a conical surface 23 that is larger on the left and smaller on the right. The conical surface 23 of the adapter sleeve 15 is coaxially assembled in the conical hole 21 of the inner circle of the bearing 14. The left side of the outer circle of the adapter sleeve 15 is an external thread. The round nut 16 is threadedly connected to the external thread on the left side of the adapter sleeve 15. The left end of the round nut 16 is press-fitted with the right end face of the clamp-type retaining ring 17, and the conical surface 23 of the adapter sleeve 15 is press-fitted with the tapered hole 21 of the inner circle of the bearing 14.

[0063] The left and right horizontal feeding bar mechanisms 9 are roller conveyors, which include a number of rubber rollers 38 spaced apart in the left-right direction. The tops of the rubber rollers 38 are lower than the top of the front side of the support frame 7. A rubber pad 39 is laid on the upper part of the frame of the roller conveyor. The vertical cross-section of the rubber pad 39 along the front-to-back direction is groove-shaped. The rear edge of the rubber pad 39 is connected to the front edge of the support frame 7. The bottom of the rubber pad 39 is provided with a through hole corresponding to each rubber roller 38. The middle top of each rubber roller 38 protrudes upward from the through hole and is located inside the rubber pad 39.

[0064] The left side of the left sliding frame 26 and the right side of the right sliding frame 26 are both connected to a baffle rod 36 through a pin shaft. The distance from the pin shaft to the upper end of the baffle rod 36 is smaller than the distance from the pin shaft to the lower end of the baffle rod 36. A counterweight block 40 is provided at the lower end of the baffle rod 36. The baffle rod 36 is located on the front side of the core shaft 2, and a limit block 37 is fixed on the support frame 7. When the sliding frame 26 slides and contacts, the rear side of the lower end of the baffle rod 36 contacts the front side of the limit block 37.

[0065] The specific process of step (1) is as follows: 1) installing the two bearings 14 into the circular hole sections 18 at the two ends of the left and right ends of the lever body 11;

[0066] 2) Insert the core shaft 2 into the lever body 1, and ensure that the outer square section of the core shaft 2 is in clearance with the inner square hole of the lever head 5;

[0067] 3) Put the left end adapter sleeve 15 onto the left end of the core shaft 2 and push it from left to right to the tapered hole 21 on the inner circle of the bearing 14. Then put the round nut 16 onto the left end of the core shaft 2 and push it from left to right to the external thread on the left side of the adapter sleeve 15. Turn the round nut 16 clockwise until the round nut 16 approaches the bearing 14. Then lock the two halves of the clamp-type retaining ring 17 (the two-half structure is connected by a bolt assembly) on the cylindrical outer circle 12 of the annular groove. Rotate the round nut 16 counterclockwise until the round nut 16 contacts the right end face of the clamp-type retaining ring 17. Continue to rotate the round nut 16 counterclockwise. The round nut 16 and the clamp-type retaining ring 17 press against each other, shrinking the expansion gap 22 of the adapter sleeve 15. The adapter sleeve 15 moves to the right and is pressed into the bearing 14.

[0068] 4) Follow the same steps as in step 3) to press the right adapter sleeve 15 into the right bearing 14 to complete the assembly of the core shaft 2 and the lever body 1.

[0069] The specific process of step (2) is as follows: the unwinding bar assembly 8 and the artificial leather product wrapped around the outer circle of the bar body 1 are hoisted onto the left sliding frame 26 and the right sliding frame 26 together, the convex arc outer circle 11 of the bottom of the annular groove 6 at the end of the core shaft 2 is rollingly connected with the concave arc outer circle 13 of the front support wheel 27 and the rear support wheel 28, and then the brake wheels are mounted on both ends of the core shaft 2 outside the support frame 7.

[0070] The specific processes of step (3) and step (8) are: the top surface of the removable unwinding frame is connected with the top surface of the online unwinding frame, and is inclined with the rear higher and the front lower. The annular grooves 6 at both ends of the core shaft 2 on the removable unwinding frame are manually rolled forward slowly along the top surface of the removable unwinding frame and the top surface of the online unwinding frame until the convex arc outer circle 11 of the bottom of the annular groove 6 at the end of the core shaft 2 is rolled and connected with the concave arc outer circle 13 of the front support wheel 27 and the rear support wheel 28 on the online unwinding frame and then stop.

[0071] The specific process of step (6) is as follows: the two cylinders 10 on the front and rear sides are started at the same time, the piston rods of the two cylinders 10 are extended synchronously, and the sliding frame 26 is driven to move forward along the horizontal slide through the push-pull rod 24 until the linkage shaft 32 at the front end of the limit push rod 30 moves into the semicircular groove 33 of the limit support 29, and the piston rod of the cylinder 10 continues to extend. Since the height of the push-pull rod 24 is higher than the limit push rod 30, the driving frame rotates upward with the center line of the linkage shaft 32 as the axis, and the sliding frame 26 moves upward and leaves the horizontal slide. As the rear end of the sliding frame 26 rises, the height of the rear support wheel 28 gradually becomes higher than the front support wheel 27, until the convex arc surface on the core shaft 2 is pressed against the highest point of the concave arc surface outer circle 13 of the front support wheel 27, the slide 26 rotates upward again, and the core shaft 2 and the bar body 1, under the action of their own gravity, break through the obstruction of the barrier rod 36, roll forward along the top surface of the slide 26, roll forward to the rubber pad 39 of the left and right horizontal bar feeding mechanism 9, until it rolls onto the rubber roller 38. Due to the effect of inertia, it will continue to roll forward, blocked and cushioned by the front slope of the rubber pad 39, and then roll backward, blocked and cushioned by the rear slope of the rubber pad 39, until it comes to a steady rest on the rubber roller 38. Start the roller conveyor, and all the rubber rollers 38 rotate synchronously, transporting the core shaft 2 and the bar body 1 to the left or right to the designated position. Then the piston rod of the cylinder 10 retracts, and the sliding frame 26 first rotates backward and downward with the linkage shaft 32 as the fulcrum until the sliding frame 26 falls onto the horizontal slide. The piston rod of the cylinder 10 continues to retract, pulling the sliding frame 26 backward until the blocking rod 36 maintained in the vertical state contacts the limit block 37, and the cylinder 10 stops working.

[0072] The specific process of step (7) is as follows: 1) remove the brake wheel (this step is a routine operation); 2) remove the two clamp-type retaining rings 17; 3) turn the round nut 16 clockwise to push the adapter sleeve 15 out of the bearing 14 for a distance, so that there is a gap between the conical hole 21 of the inner circle of the bearing 14 and the conical surface 23 of the outer circle of the adapter sleeve 15, and take out the round nut 16 and the adapter sleeve 15 along the axial direction of the core shaft 2; 4) pull out the core shaft 2 from the lever body 1, and send the core shaft 2 to the next product roll for reuse.

[0073] By adopting the above technical solution, the outer circle of the lever head 5 in the present invention is turned, holes are dug at the left and right ends of the lever body 1 based on the outer circle of the lever head 5, the two lever heads 5 are installed and welded on the rear end face, and then the circular hole section 18 of the inner circle of the lever head 5 is turned on a lathe (shortening the length of the original bell mouth), ensuring the concentricity of the circular hole section 18 relative to the core shaft 2.

[0074] A round nut 16 is used to press the adapter sleeve 15 into the bearing 14. The conical surface 23 of the outer circle of the adapter sleeve 15 is tightly fixed to the conical hole 21 of the inner circle of the bearing 14, fundamentally eliminating the gap between the square hole section 20 of the lever body 1 and the outer square section of the core shaft 2, ensuring that the lever body 1 does not jump or move relative to the core shaft 2 during the unwinding process, and ensuring stability and tension stability during high-speed unwinding.

[0075] The convex arc outer circle 11 on the core shaft 2 of the axial positioning structure is rollingly connected with the concave arc outer circle 13 of the front support wheel 27 and the rear support wheel 28, which has good axial positioning performance and prevents the core shaft 2 from axially moving relative to the support wheels.

[0076] As the product roll is released, its weight decreases, and the spindle 2 rotates at an increasing speed. To prevent the spindle 2 from being pulled forward by the product and thus disengaging from the front and rear support wheels 27 and 28, a stopper 36 is provided. The rear side of the lower end of the stopper 36 is restricted by a stopper 37, which prevents the spindle 2 from moving forward and maintains good stability. A counterweight 40 is provided at the lower end of the stopper 36. When the slide 26 is reset from top to bottom, the stopper 36 can always remain in a vertical position, ensuring that the lower end of the stopper 36 is always located in front of the stopper 37 and does not contact the stopper 37.

[0077] The specific process of step (5) in the present invention is as follows: about one minute before the roll on the online unwinding stand is finished, a section of the roll to be unwound on the movable unwinding stand is manually unwound and led to the flattening roller. When only about two meters of the roll on the online unwinding stand is left, the manually unwound section is sent over the flattening roller. In this way, the tail of the roll on the online unwinding stand will bring the head of the roll on the movable unwinding stand into the laminating area of ​​the laminating device, and then the PVC film peeled off from the lower roller will also enter the laminating area, realizing the lamination of the next roll. After the lamination is completed, a layer of PVC film is applied to the semi-finished product of the previous process, and the semi-finished product enters the cooling machine for cooling and shaping. After cooling and shaping, the semi-finished product is wound into a large roll with a diameter of about 1 meter by the winder and transferred to the next process. Step (5) is a conventional operation in this field.

[0078] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of protection of the technical solution of the present invention.

Claims

1. A working method of a roll changing device, characterized in that: The following steps are involved: (1) The outer surface of the hollow bar body is wrapped with artificial leather, the core shaft is inserted into the bar body, and the core shaft and the bar body are assembled into one body through two sets of radial positioning mechanisms to form an unwinding bar assembly; (2) The driving hook is hung at both ends of the core shaft, and the artificial leather product wrapped around the outside of the unwinding bar assembly is hoisted onto the removable unwinding rack, and then the artificial leather product wrapped around the outside of the unwinding bar assembly is moved to the online unwinding rack on the front side; (3) The crane hoists the next roll of artificial leather products onto the removable unwinding rack for standby use; (4) Unwinding the product on the online unwinding rack; (5) After unwinding is completed, the first section of the product roll on the unwinding rack can be moved out and connected to the tail section of the product on the line unwinding rack to perform the roll changing operation; (6) The flip-type pushing mechanism automatically pushes the empty unwinding bar assembly to the left and right horizontal bar feeding mechanisms in front of the online unwinding frame, and the left and right horizontal bar feeding mechanisms transport the unwinding bar assembly to the left or right to the bar receiving trolley; (7) Separate the core shaft of the unwinding lever assembly from the lever body; (8) Push the spare product roll on the removable unwinding rack forward to the two sliding flip roller devices on the online unwinding rack; (9) Repeat step (1), and then hoist the product roll of the assembled unwinding bar assembly onto a removable unwinding rack for standby use; The removable unwinding frame includes a support frame with a travel wheel at the bottom, two sliding and flipping roller devices of the same structure and respectively arranged at the upper part of the left and right ends of the support frame, an unwinding bar assembly is arranged horizontally in the left and right directions, the outer circle of the left end of the unwinding bar assembly is rotatably connected to the top of the sliding and flipping roller device on the left side through a left axial positioning structure, and the outer circle of the right end of the unwinding bar assembly is rotatably connected to the top of the sliding and flipping roller device on the right side through a right axial positioning structure, and the left and right horizontal feeding bar mechanisms are arranged at the upper front part of the support frame; The sliding and flipping roller device includes a cylinder, a push-pull rod, a horizontal track, a sliding frame, a front support wheel, a rear support wheel, a limit support and a limit push rod. The horizontal track is arranged on the support frame in the left and right directions, and the bottom of the sliding frame is slidably connected to the horizontal track. The front support wheel and the rear support wheel are rotatably connected to the sliding frame. The front support wheel and the rear support wheel have the same height and are arranged at intervals front and back. The cylinder, push-pull rod and limit push rod are all arranged in the front and back directions. The rear end of the cylinder body is arranged on the upper left side of the support frame through a hinge support, the front end of the push-pull rod is fixedly connected to the upper rear side of the sliding frame, and the rear end of the push-pull rod is hinged to the front end of the piston rod of the cylinder. The rear end of the limit push rod is fixedly connected to the lower front part of the sliding frame, and the position of the push-pull rod is higher than the limit push rod in the height direction. The front ends of the limit push rods of the two sliding flip roller devices are connected by a linkage shaft horizontally arranged along the left and right directions. The limit support is fixedly arranged on the front side of the support frame, and the rear side of the limit support is provided with a semicircular groove with a rear open side, and the semicircular groove corresponds to the front and rear ends of the linkage shaft; an axial positioning block is provided on the linkage shaft, which contacts the right side of the left limit support and the left side of the right limit support; the top surface of the support frame is tilted to be higher at the rear and lower at the front, and the top surface of the support frame extends from the rear to the front to the top of the rear support wheel; Hollow bar heads are welded to the left and right ends of the inner hole of the bar body, the core shaft is coaxially installed in the bar body, and an annular groove is provided on the outer circles of the left and right ends of the core shaft respectively. Two sets of radial positioning mechanisms are respectively arranged between the left end of the core shaft and the left bar head and between the right end of the core shaft and the right bar head; the two annular grooves have the same structure and are symmetrically arranged on the left and right sides. The bottom of the left annular groove includes the outer circle of the convex arc surface on the left and the outer circle of the cylindrical surface on the right. The outer diameter of the outer circle of the cylindrical surface is smaller than the minimum outer diameter of the outer circle of the convex arc surface; The left axial positioning structure and the right axial positioning structure are identical and symmetrically arranged on both sides; the left axial positioning structure includes the concave arc outer circle of the front support wheel and the rear support wheel on the left side and the convex arc outer circle, and the convex arc outer circle on the core shaft is in rolling connection with the concave arc outer circle of the front support wheel and the rear support wheel; The two sets of radial positioning mechanisms have the same structure and are symmetrically arranged on the left and right sides; the left and right ends of the lever heads have the same structure and are symmetrically arranged on the left and right sides; the radial positioning mechanism on the left side includes a bearing, a tightening sleeve, a round nut and a clamp-type retaining ring. The inner hole of the left end lever head is a circular hole section, a conical section with a larger left portion and a smaller right portion, and a square hole section from left to right. The outer square section on the core shaft is clearance-matched with the square hole section. The clamp-type retaining ring is coaxially installed on the outer circle of the cylindrical surface of the left annular groove. The outer circle of the bearing is interference-fitted on the circular hole section of the lever head. The circle is a tapered hole that is larger on the left and smaller on the right. The adapter sleeve is coaxially installed on the outer circle of the core shaft on the right side of the clamp-type retaining ring. The adapter sleeve is provided with an expansion joint along the axial direction. The right side of the outer circle of the adapter sleeve is a conical surface that is larger on the left and smaller on the right. The conical surface of the adapter sleeve is coaxially assembled in the tapered hole of the inner circle of the bearing. The left side of the outer circle of the adapter sleeve is an external thread. The round nut is threadedly connected to the external thread on the left side of the adapter sleeve. The left end of the round nut is press-fitted with the right end face of the clamp-type retaining ring, and the conical surface of the adapter sleeve is press-fitted with the tapered hole of the inner circle of the bearing.

2. A working method of a roll changing device according to claim 1, characterized in that: The left and right horizontal bar mechanisms are roller conveyors, which include a number of rubber rollers spaced apart in the left-right direction. The tops of the rubber rollers are lower than the top of the front side of the support frame. A rubber pad is laid on the upper part of the frame of the roller conveyor. The vertical cross-section of the rubber pad along the front-to-back direction is groove-shaped. The rear edge of the rubber pad is connected to the front edge of the support frame. The bottom of the rubber pad is provided with a through hole corresponding to each rubber roller. The middle top of each rubber roller protrudes upward from the through hole and is located inside the rubber pad. The left side of the left sliding frame and the right side of the right sliding frame are both connected to a stop rod through a pin shaft. The distance from the pin shaft to the upper end of the stop rod is smaller than the distance from the pin shaft to the lower end of the stop rod. A counterweight block is provided at the lower end of the stop rod. The stop rod is located in front of the core shaft. A limit block is fixed on the support frame. When the sliding frame slides and contacts, it contacts the front side of the limit block at the rear side of the lower end of the stop rod.

3. A working method of a roll changing device according to claim 2, characterized in that: The specific process of step (1) is as follows: 1) install the two bearings into the circular hole sections of the two ends of the left and right ends of the lever body; 2) Insert the core shaft into the rod body, and ensure that the outer square section of the core shaft fits the inner square hole of the rod head; 3) Put the left end adapter sleeve onto the left end of the mandrel and push it from left to right to the tapered hole on the inner circle of the bearing. Then put the round nut onto the left end of the mandrel and push it from left to right to the external thread on the left side of the adapter sleeve. Turn the round nut clockwise until the round nut approaches the bearing. Then lock the two halves of the clamp-type retaining ring on the cylindrical outer circle of the ring groove. Rotate the round nut counterclockwise until the round nut contacts the right end face of the clamp-type retaining ring. Continue to rotate the round nut counterclockwise. The round nut and the clamp-type retaining ring press against each other, the expansion gap of the adapter sleeve is reduced, and the adapter sleeve moves to the right and is pressed into the bearing. 4) Follow the same steps as in step 3) to press the right adapter sleeve into the right bearing to complete the assembly of the core shaft and lever body.

4. A working method of a roll changing device according to claim 3, characterized in that: The specific process of step (2) is as follows: the unwinding bar assembly and the artificial leather product wrapped around the outer circle of the bar are hoisted onto the left sliding frame and the right sliding frame, the convex arc outer circle of the annular groove at the end of the core shaft is rollingly connected with the concave arc outer circle of the front support wheel and the rear support wheel, and then the brake wheels are mounted on both ends of the core shaft outside the support frame.

5. A working method of a roll changing device according to claim 4, characterized in that: The specific processes of step (3) and step (8) are: the top surface of the removable unwinding frame is connected with the top surface of the online unwinding frame, and is inclined with the rear higher and the front lower. The annular grooves at both ends of the core shaft on the removable unwinding frame are manually rolled forward slowly along the top surface of the removable unwinding frame and the top surface of the online unwinding frame until the convex arc outer circle of the bottom of the annular groove at the end of the core shaft is rolled and connected with the concave arc outer circle of the front support wheel and the rear support wheel on the online unwinding frame and then stop.

6. A working method of a roll changing device according to claim 5, characterized in that: The specific process of step (6) is as follows: the two cylinders on the front and rear sides are started at the same time, the piston rods of the two cylinders extend synchronously, and the sliding frame is driven to move forward along the horizontal slide through the push-pull rod until the linkage shaft at the front end of the limit push rod moves into the semicircular groove of the limit support. The piston rod of the cylinder continues to extend. Since the height of the push-pull rod is higher than the limit push rod, the driving frame rotates upward with the center line of the linkage shaft as the axis, and the sliding frame moves upward and leaves the horizontal slide. As the rear end of the sliding frame rises, the height of the rear support wheel gradually becomes higher than the height of the front support wheel. The wheel is then pushed back and the roller is moved along the top of the slide frame, ... Start the roller conveyor, and all rubber rollers rotate synchronously, transporting the core shaft and the bar body to the left or right to the designated position; Then the piston rod of the cylinder retracts, and the sliding frame first rotates backward and downward with the linkage shaft as the fulcrum until the sliding frame falls onto the horizontal slide. The piston rod of the cylinder continues to retract, pulling the sliding frame backward until the cylinder stops working when the stop rod maintained in the vertical state contacts the limit block.

7. A working method of a roll changing device according to claim 6, characterized in that: The specific process of step (7) is as follows: 1) remove the brake wheel; 2) remove the two clamp-type retaining rings; 3) turn the round nut clockwise to push the adapter sleeve out of the bearing for a while, so that there is a gap between the conical hole of the inner circle of the bearing and the conical surface of the outer circle of the adapter sleeve. Take out the round nut and the adapter sleeve along the axial direction of the core shaft; 4) pull out the core shaft from the rod body and send the core shaft to the next roll of products for reuse.

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