Bridge bending resistant core tube hole tooth processing equipment and method

Abstract

The present application relates to the technical field of winding core pipe processing, and particularly relates to a winding core pipe inner hole tooth shape processing equipment and method capable of resisting bridge bending, which comprises a stable shaft, a fixing mechanism for supporting and limiting the stable shaft and the winding core pipe, and a pressure tooth mechanism for rolling a groove on the inner wall of the winding core pipe; the present application can solve the shortcomings of the existing processing mode: the extrusion molding is prone to cause deformation of the tooth shape, which seriously affects the pressure bearing capacity and bending resistance of the winding core pipe; in addition, the secondary cutting processing mode is prone to cause thinning of the winding core pipe wall, which reduces the bending resistance of the winding core pipe; the present application adopts a heating and rolling processing mode to gradually roll and process the groove on the inner wall of the winding core pipe, which is not molded at one time, can not only prevent the winding core pipe from being deformed due to overheating, but also avoid affecting the hardness of the winding core pipe by cutting, significantly improves the overall strength and bending resistance of the winding core pipe, and can effectively replace the existing extrusion molding and secondary cutting processing.

Description

Technical Field

[0001] This invention relates to the field of core tube processing technology, and in particular to a processing equipment and method for the inner hole tooth profile of a core tube resistant to bridge bending. Background Technology

[0002] In the film, nonwoven fabric, and paper roll processing industries, core tubes are commonly used outside air shafts to complete processes such as raw material winding, finished product slitting, and rewinding. Due to the radial compression of the roll material and the bridge-like bending deformation caused by its own span support, the tube is prone to denting and bending when winding wide and heavy roll materials. This results in uneven winding tightness, end face wrinkles, and uneven surface, leading to finished product scrap. Therefore, in order to improve the bending resistance of the core tube, reduce its weight, and achieve anti-slip locking with the air shaft, several axially extending toothed protrusions are usually made on the inner wall of the core tube. This gives the core tube high bending strength, lightweight, and anti-slip properties. The existing toothed inner wall of the core tube is usually formed by extrusion molding and secondary cutting.

[0003] However, the current processing methods have some shortcomings: 1. Because existing extrusion molding uses one-time integral melting and cooling molding, the mold length is limited and it is difficult to achieve uniform control of the entire length during the cooling process. It is also impossible to guarantee the parallelism between the toothed protrusions and the axis of the core tube, which leads to easy deformation of the toothed protrusions, seriously affecting the pressure-bearing capacity and bending resistance of the core tube.

[0004] 2. In addition, the secondary cutting process uses material removal to process the inner hole tooth shape, which requires cutting and removing the tube wall material layer by layer. This will generate a large amount of plastic waste, reduce the material utilization rate, and after cutting, the tube wall of the core tube will be thinned, which will easily lead to a decrease in the bending strength of the core tube.

[0005] Therefore, based on the above-mentioned viewpoints, there is still room for improvement in the existing methods for machining the tooth profile of the inner hole of the core tube. Summary of the Invention

[0006] To address the problems of existing processing methods, this invention provides a machining device for the inner hole teeth of a core tube resistant to bridge bending, comprising: a stabilizing shaft; a fixing mechanism disposed outside the stabilizing shaft for supporting and limiting the stabilizing shaft and the core tube; and a tooth pressing mechanism including a displacement block slidably sleeved on the outer wall of the stabilizing shaft, the outer wall of the displacement block being provided with a grooving unit for rolling grooves on the inner wall of the core tube. The grooving unit is used to roll multiple annularly distributed grooves on the inner wall of the core tube, the grooves being parallel to the axis of the core tube, such that adjacent grooves form a core. The tube has toothed protrusions; the fixing mechanism includes a limiting unit for supporting the core tube to be processed. The limiting unit has a top support component for supporting and limiting the outer side of the core tube, and a positioning component for blocking the end of the core tube, for positioning the core tube, which is sleeved on the outside of the stabilizing shaft, at the processing station; when the core tube is processed with toothed inner hole, the core tube is sleeved on the outside of the stabilizing shaft, and the stabilizing shaft and the core tube are fixed in multiple directions by the fixing mechanism and the limiting unit. Then, several toothed protrusions are rolled on the inner wall of the core tube by the pressing unit.

[0007] Preferably, the top support assembly includes a fixed platform installed below the stabilizing shaft. Two linkage frames are symmetrically arranged on the upper end of the fixed platform along the axis of the stabilizing shaft. Several rollers are arranged at equal intervals along the axis of the stabilizing shaft through a connecting frame on the upper end of the linkage frame. The rollers roll against the outer wall of the core tube. After the core tube is sleeved outside the stabilizing shaft, the rollers on both sides below the stabilizing shaft abut against the outer wall of the core tube, which is used to push the core tube upward and limit its position, so that the core tube and the axis of the stabilizing shaft are aligned.

[0008] Preferably, the positioning component includes a support frame installed on the side wall of the fixed platform. The upper end of the support frame is provided with a first annular frame that coincides with the axis of the stabilizing shaft. A plurality of push cylinders are installed on the inner wall of the first annular frame. The output end of the push cylinders points to the stabilizing shaft and is equipped with an L-shaped baffle. The horizontal section of the L-shaped baffle is used to abut against the outer wall of the core tube to provide circumferential outward support, and the vertical section of the L-shaped baffle is used to stop the end of the core tube, so that the positioned core tube is located at the preset processing position.

[0009] Preferably, the upper end of the fixed platform has two sliding grooves symmetrically distributed along the stability axis, and a moving block is slidably assembled inside the sliding groove, with the linkage frame installed on the upper end of the moving block; Two double-ended screws are symmetrically and rotatably installed on the fixed platform along the length of the sliding groove. The double-ended screws pass through the moving blocks in the two sliding grooves by means of threaded connection. A drive motor connected to any one of the double-ended screws is provided on the side wall of the fixed platform through a motor base. When the double-headed screw rotates, it drives two moving blocks on its outer wall to move towards each other or away from each other. The moving blocks drive the rollers on both sides of the stabilizing shaft to move synchronously through the linkage frame and connecting frame, which is used to adjust the distance between the two sets of rollers according to the outer diameter of the core tube.

[0010] Preferably, two lifting cylinders are symmetrically arranged at the upper end of the linkage frame along the length direction. The connecting frame is installed on the top of the output end of the lifting cylinder. A guide plate is installed at the upper end of the linkage frame. A through hole is opened on the connecting frame to slide through the guide plate, which is used to provide stable support for the lifting and lowering of the connecting frame.

[0011] Preferably, the fixing mechanism further includes a support unit for supporting and limiting the ends of the core tube and the stabilizing shaft. The support unit includes a positioning frame installed on the side of the fixing platform away from the support frame. A second annular frame is provided on the upper end of the positioning frame. Two fixing sleeves located inside the second annular frame are fixedly sleeved on the outer wall of the stabilizing shaft. The inner wall of the second annular frame and the outer wall of the fixed sleeve are each equipped with a number of annularly distributed and corresponding positioning cylinders. The output end of the positioning cylinder is provided with a top plate. On the side of the top plate away from the positioning cylinder, an abutment block is mounted through a mounting plate. On the side of the abutment block away from the mounting plate, a squeezing roller is rotatably provided.

[0012] Preferably, the pressing mechanism further includes a receiving frame installed on the side wall of the first annular frame, a positioning plate fixedly sleeved on the stabilizing shaft, and two lead screws symmetrically rotated between the positioning plate and the receiving frame along the stabilizing shaft. The lead screws pass through the displacement block through a threaded connection, and a forward and reverse motor connected to any one of the lead screws is installed on the side wall of the receiving frame through a motor cover.

[0013] Preferably, the pressure groove unit is installed on the annular stabilizer on the outer wall of the displacement block, and the outer wall of the annular stabilizer is detachably provided with a plurality of actuators equidistantly distributed along its axial direction; The actuator includes multiple support plates that are circumferentially and evenly installed on the outer wall of the annular stabilizer. The support plates are detachably connected to the annular stabilizer. A bottom support plate is provided between two adjacent support plates. An elastic telescopic plate is installed on the side of the bottom support plate away from the annular stabilizer. A grooving roller for rolling grooves on the inner wall of the core tube is rotatably provided between the two elastic telescopic plates of two adjacent support plates.

[0014] Preferably, an air pump is installed inside the displacement block, and an annular transfer chamber connected to the exhaust end of the air pump is opened inside the displacement block. An electric heating wire is installed inside the annular transfer chamber. Multiple circumferentially uniform exhaust ports are also opened at both ends of the displacement block. The exhaust ports are connected to the annular transfer chamber. An annular air guide cylinder connected to the exhaust port is installed at both ends of the displacement block.

[0015] In addition, this application also provides a method for machining the inner hole teeth of a core tube resistant to bridge bending, including the following steps: S1: Core tube placement: The core tube is lifted by external hoisting equipment and inserted into the outside of the stabilizing shaft; S2: Core tube fixing: The core tube is fixed in multiple directions by a fixing mechanism; S3: Core tube processing: Toothed protrusions are processed on the inner wall of the core tube by a tooth pressing mechanism; S4: Core tube removal: Release the limiting and fixing of the core tube, and then remove the core tube using hoisting equipment.

[0016] In summary, this application includes the following beneficial technical effects: I. This invention employs a heating and rolling process to gradually roll grooves into the inner wall of the core tube, rather than forming them in one step. This not only prevents the core tube from overheating and deforming but also improves processing efficiency. It can effectively replace existing extrusion molding and secondary cutting processes, effectively avoiding the deformation caused by inadequate local cooling in extrusion molding, as well as the time-consuming and labor-intensive problems of secondary cutting processes, thus ensuring the bending strength of the core tube. In addition, there is no need to remove material, avoiding the generation of a large amount of waste, and avoiding the reduction of the core tube's hardness by secondary cutting, significantly improving the overall strength and bending resistance of the core tube, meeting the requirements for winding and using large-width, high-grammage rolls.

[0017] Second, the present invention can adjust the distance between the roller and the stabilizing shaft according to the outer diameter of the core tube, that is, the distance between the axis of the roller and the axis of the stabilizing shaft is equal to the radius of the outer diameter of the core tube, so that the roller after adjustment can support the core tube, so that the axis of the core tube and the axis of the stabilizing shaft coincide, and can be adaptively adjusted according to actual needs, effectively improving the adaptability of the present invention.

[0018] Third, the present invention uses multiple sets of rotatable and elastically deformable extrusion rollers to provide multi-directional support to the inner and outer walls of one end of the core tube. As the abutment block presses and deforms the extrusion rollers, when the abutment block comes into contact with the core tube, it is used to cooperate with the L-shaped baffle to limit and fix both ends of the core tube, ensuring the stability of the core tube during the processing. Attached Figure Description

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

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the fixing mechanism of the present invention.

[0022] Figure 3 This is a structural diagram of the positioning component and the supporting unit of the present invention.

[0023] Figure 4This is a schematic diagram of the structure of the support unit of the present invention.

[0024] Figure 5 This is a schematic diagram of the tooth pressing mechanism of the present invention.

[0025] Figure 6 This is the present invention. Figure 5 A magnified view of part A.

[0026] Figure 7 This is a schematic diagram of the structure between the annular stabilizer and the groove roller of the present invention.

[0027] In the diagram, 1 is the stabilizing shaft; 100 is the core tube. 2. Fixing mechanism; 20. Limiting unit; 21. Top support assembly; 211. Fixing platform; 212. Linkage frame; 213. Connecting frame; 214. Roller; 215. Sliding groove; 216. Moving block; 217. Double-ended screw; 218. Drive motor; 219. Lifting cylinder; 210. Guide plate; 22. Positioning assembly; 221. First annular frame; 222. Pushing cylinder; 223. L-shaped baffle; 23. Supporting unit; 231. Second annular frame; 232. Fixing sleeve; 233. Positioning cylinder; 234. Top plate; 235. Mounting plate; 236. Abutment block; 237. Extrusion roller; 3. Gear pressing mechanism; 31. Displacement block; 32. Grooving unit; 321. Annular stabilizer; 322. Support plate; 323. Bottom support plate; 324. Elastic telescopic plate; 325. Grooving roller; 326. Air pump; 327. Annular transfer chamber; 328. Electric heating wire; 329. Exhaust port; 320. Annular air guide tube; 33. Receiving frame; 34. Positioning plate; 35. Lead screw; 36. Forward and reverse motor. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-7 The embodiments of the present invention will be described in detail below.

[0029] This application discloses a toothed processing device for the inner hole of a core tube resistant to bridge bending. It should be noted that this application is mainly used in the process of processing toothed protrusions on the inner wall of the core tube 100. In terms of technical effect, the heating and rolling processing method can gradually roll and process grooves on the inner wall of the core tube 100, which is not a one-time forming. This not only prevents the core tube 100 from overheating and deforming, but also improves processing efficiency. It can effectively replace the defects of existing extrusion molding and secondary cutting processing.

[0030] Reference Figure 1As shown, a machine for machining the inner hole teeth of a core tube 100 resistant to bridge bending includes a stabilizing shaft 1; a fixing mechanism 2, disposed outside the stabilizing shaft 1, for supporting and limiting the stabilizing shaft 1 and the core tube 100; a tooth pressing mechanism 3, including a displacement block 31 slidably sleeved on the outer wall of the stabilizing shaft 1, the outer wall of the displacement block 31 being provided with a pressing unit 32 for rolling grooves on the inner wall of the core tube 100, the pressing unit 32 for rolling multiple annularly distributed grooves on the inner wall of the core tube 100, the grooves being parallel to the axis of the core tube 100, such that adjacent grooves form tooth-shaped protrusions of the core tube 100; the fixing mechanism 2 includes a limiting unit 20 for supporting the core tube 100 to be processed, the limiting unit 20 having a top support assembly 21 for supporting and limiting the outer side of the core tube 100, and a positioning assembly 22 for blocking the end of the core tube 100, for positioning the core tube 100 sleeved outside the stabilizing shaft 1 at the processing station.

[0031] In actual operation, since the diameter and length of the core tube 100 are usually large, it is necessary to use external hoisting equipment to lift the core tube 100 according to the actual situation, and insert it from one end of the stabilizing shaft 1 to the outside of the stabilizing shaft 1. The stabilizing shaft 1 and the core tube 100 are fixed in multiple directions by the fixing mechanism 2 and the limiting unit 20 to ensure the stability of the stabilizing shaft 1 and the core tube 100. Then, the tooth pressing mechanism 3 processes tooth-shaped protrusions on the inner wall of the core tube 100.

[0032] Reference Figure 2 As shown, in order to ensure the stability of the core tube 100 after it is fitted onto the outside of the stabilizing shaft 1, a top support assembly 21 is provided in this embodiment. Specifically, the top support assembly 21 includes a fixed platform 211 installed below the stabilizing shaft 1. Two linkage frames 212 are symmetrically arranged on the upper end of the fixed platform 211 along the axis of the stabilizing shaft 1. Several rollers 214 are evenly distributed along the axis of the stabilizing shaft 1 through a connecting frame 213 on the upper end of the linkage frame 212. The rollers 214 roll against the outer wall of the core tube 100. After the core tube 100 is fitted onto the outside of the stabilizing shaft 1, the rollers 214 on both sides below the stabilizing shaft 1 abut against the outer wall of the core tube 100 to push and limit the core tube 100 upward, so that the core tube 100 and the axis of the stabilizing shaft 1 remain coincident.

[0033] Reference Figure 3As shown, in order to facilitate the positioning of the core tube 100 at the designated processing station and to facilitate the precise processing of its inner hole tooth shape, a positioning component 22 is also provided in this embodiment. Specifically, the positioning component 22 includes a support frame installed on the side wall of the fixed table 211. The upper end of the support frame is provided with a first annular frame 221 that coincides with the axis of the stabilizing shaft 1. Several pushing cylinders 222 are installed on the inner wall of the first annular frame 221. The output end of the pushing cylinder 222 points to the stabilizing shaft 1 and is equipped with an L-shaped baffle 223. The horizontal section of the L-shaped baffle 223 is used to abut against the outer wall of the core tube 100 to provide circumferential outward support. The vertical section of the L-shaped baffle 223 is used to stop the end of the core tube 100, so that the positioned core tube 100 is located at the preset processing station. The side of the vertical section of the L-shaped baffle 223 away from the pushing cylinder 222 does not extend to the groove of the core tube 100, thereby avoiding interference with the rolling processing of the groove of the inner wall of the core tube 100.

[0034] Reference Figure 2 As shown, to accommodate core tubes 100 of different diameters, the rollers 214 on both sides of the stabilizing shaft 1 can be adjusted accordingly. Specifically, the upper end of the fixed platform 211 has two sliding grooves 215 symmetrically distributed along the stabilizing shaft 1. Moving blocks 216 are slidably fitted inside the sliding grooves 215, and a linkage frame 212 is installed on the upper end of the moving blocks 216. Two double-ended screws 217 are symmetrically rotatably mounted on the fixed platform 211 along the length of the sliding grooves 215. The double-ended screws 217 pass through the moving blocks 216 in the two sliding grooves 215 via threaded connections, moving... When block 216 is subjected to the rotation of double-headed screw 217, it can only slide along sliding groove 215. The two double-headed screws 217 are connected by belt drive. The side wall of fixed platform 211 is equipped with a drive motor 218 connected to any one of the double-headed screws 217 via motor base. When the double-headed screw 217 rotates, it drives the two moving blocks 216 on its outer wall to move towards each other or away from each other. The moving blocks 216 drive the rollers 214 on both sides of the stabilizing shaft 1 to move synchronously through linkage frame 212 and connecting frame 213, which is used to adjust the distance between the two sets of rollers 214 according to the outer diameter of core tube 100.

[0035] Furthermore, in this embodiment, two lifting cylinders 219 are symmetrically arranged on the upper end of the linkage frame 212 along the length direction. The connecting frame 213 is installed on the top of the output end of the lifting cylinder 219. A guide plate 210 is installed on the upper end of the linkage frame 212. A through hole is opened on the connecting frame 213 to slide through the guide plate 210, which is used to provide stable support for the lifting and lowering of the connecting frame 213.

[0036] In actual operation, the lifting cylinder 219 is activated, which drives the connecting frame 213 and rollers 214 to move up and down as a whole. This is used to adjust the height of the rollers 214 according to the outer diameter of the core tube 100. At the same time, the drive motor 218 is activated, which drives the double-headed screw 217 to rotate. The double-headed screw 217 drives the moving block 216, the linkage frame 212, the connecting frame 213, and the rollers 214 to move as a whole. This causes the rollers 214 on both sides of the stabilizing shaft 1 to move relative to each other or move away from each other. This allows the distance between the rollers 214 and the stabilizing shaft 1 to be adjusted according to the outer diameter of the core tube 100. That is, the distance between the axis of the rollers 214 and the stabilizing shaft 1 is equal to the radius of the outer diameter of the core tube 100. This allows for adaptive adjustment according to actual needs, effectively improving the applicability of the invention.

[0037] During this period, the push cylinder 222 is activated, which drives the L-shaped baffle 223 to move closer to the stabilizing shaft 1, so that the horizontal section of the L-shaped baffle 223 fits against the outer wall of the core tube 100 that is about to be inserted into the outside of the stabilizing shaft 1.

[0038] Subsequently, the hoisting equipment inserts the core tube 100 into one end of the stabilizing shaft 1. The bottom sides of the core tube 100 are supported by rollers 214, allowing it to be smoothly and stably inserted into the outside of the stabilizing shaft 1. Then, the end of the core tube 100 abuts against and is positioned by multiple L-shaped baffles 223, placing the core tube 100 in a preset processing position. The hoisting equipment then withdraws from the core tube 100, and the other end of the core tube 100 is limited by the fixing mechanism 2, so that the core tube 100 is fixed in multiple directions. Then, the toothed protrusions are processed on the inner wall of the core tube 100 by the tooth pressing mechanism 3. After processing is completed, the limitation on the end of the core tube 100 away from the L-shaped baffle 223 is released, and the core tube 100 is then removed from the outside of the stabilizing shaft 1 by the hoisting equipment.

[0039] Reference Figure 3 and Figure 4As shown, since the core tube 100 needs to be fitted onto the outside of the stabilizing shaft 1, there must be no obstructions around the fitting end of the stabilizing shaft 1 when the core tube 100 is fitted. Therefore, in this embodiment, the fixing mechanism 2 also includes a support unit 23 for supporting and limiting the ends of the core tube 100 and the stabilizing shaft 1. The support unit 23 includes a positioning frame installed on the side of the fixing platform 211 away from the support frame. A second annular frame 231 is provided on the upper end of the positioning frame. Two fixing sleeves 232 located inside the second annular frame 231 are fixedly fitted on the outer wall of the stabilizing shaft 1. Several annularly distributed and correspondingly positioned positioning cylinders 233 are installed on the inner wall of the second annular frame 231 and the outer wall of the fixing sleeves 232. A top plate 234 is provided at the output end of the positioning cylinder 233. The top plate 234 is located away from the positioning cylinder. A contact block 236 is mounted on one side of cylinder 233 via mounting plate 235. A squeeze roller 237 is rotatably mounted on the side of contact block 236 away from mounting plate 235. The squeeze roller 237 has an arc-shaped structure. The squeeze roller 237 mounted on the second annular frame 231 abuts against the outer wall of the core tube 100, and the squeeze roller 237 mounted on the fixed sleeve 232 abuts against the inner wall of the core tube 100. That is, the axis of the squeeze roller 237 is arc-shaped. The squeeze roller 237 is made of flexible rubber, preferably high wear resistance, high elasticity and tear resistance polyurethane. It can not only undergo elastic deformation under external force, but also adapt to fit the inner and outer walls of the core tube 100 to achieve uniform contact and ensure that there is rolling friction between the squeeze roller 237 and the core tube 100 without slippage, thereby avoiding scratching the core tube 100.

[0040] In the initial state, a set of extrusion rollers 237 near the first annular frame 221 abut against each other, providing main support for the stabilizing shaft 1, while a set of extrusion rollers 237 away from the first annular frame 221 are in an open state, facilitating the insertion of the core tube 100. When it is necessary to insert the core tube 100 outside the stabilizing shaft 1, the positioning cylinder 233 on the side away from the first annular frame 221 is activated first. This positioning cylinder 233 drives the abutment block 236 and the extrusion rollers 237 to move as a whole, and the two sets of extrusion rollers 237 on the second annular frame 231 and the fixed sleeve 232... 7. Adjust the two sets of extrusion rollers 237 according to the diameter of the core tube 100 to be processed, so that the two sets of extrusion rollers 237 not only separate to form a gap that facilitates the passage of the core tube 100, but also match the gap with the core tube 100, so that the core tube 100 can smoothly pass through the gap between the multiple sets of extrusion rollers 237 and be fitted onto the stabilizing shaft 1. An inclined guide plate is installed on the side wall of the abutment block 236 to guide the core tube 100 to be smoothly inserted into the gap between the two sets of extrusion rollers 237. During this period, the stabilizing shaft 1 is supported by another set of mutually abutting extrusion rollers 237.

[0041] After the core tube 100 is inserted into the gap, the positioning cylinder 233 on the side away from the first annular frame 221 drives the extrusion roller 237 to abut against the inner and outer walls of the core tube 100, so that the extrusion roller 237 and the core tube 100 form rolling friction, and the support function for the stabilizing shaft 1 is restored through the rolling contact between the extrusion roller 237 and the core tube 100.

[0042] Next, the core tube 100 continues to be inserted, and the positioning cylinder 233 near the first annular frame 221 is activated. The positioning cylinder 233 drives the extrusion roller 237 to separate and form a gap that matches the core tube 100, so that the core tube 100 is inserted into the gap. Then, the positioning cylinder 233 controls the extrusion roller 237 to roll and abut against the core tube 100. During this period, the stabilizing shaft 1 is supported by another set of mutually abutting extrusion rollers 237. After the core tube 100 is completely inserted, the output end of the positioning cylinder 233 applies pressure to the abutting block 236. The abutting block 236 presses and deforms the extrusion roller 237, so that the abutting block 236 abuts against the core tube 100. This is used to limit and fix the two ends of the core tube 100 in conjunction with the L-shaped baffle 223 to ensure the stability of the core tube 100 during the processing.

[0043] Furthermore, by alternately supporting the stabilizing shaft 1 with two sets of extrusion rollers 237, there is no interference with the insertion and removal of the core tube 100, and a seamless switch between movable support and fixed support can be achieved during the processing of the core tube 100. At the same time, continuous support for the stabilizing shaft 1 and multi-directional limiting of the core tube 100 are completed.

[0044] After the core tube 100 is processed, the positioning cylinder 233 drives the abutment block 236 to reset, so that the extrusion roller 237 resumes rolling contact with the core tube 100, which is used to release the contact limit on the core tube 100. Then, the core tube 100 is removed from the outside of the stabilizing shaft 1 by external hoisting equipment. During this period, the two sets of extrusion rollers 237 alternately provide support to the stabilizing shaft 1 in the same way.

[0045] Reference Figure 5 , Figure 6 and Figure 7 As shown, in order to facilitate the rapid processing of toothed protrusions on the inner wall of the core tube 100, in this embodiment, the pressing mechanism 3 also includes a receiving frame 33 installed on the side wall of the first annular frame 221. A positioning plate 34 is fixedly sleeved on the stabilizing shaft 1. Two lead screws 35 are symmetrically rotated between the positioning plate 34 and the receiving frame 33 along the stabilizing shaft 1. The two lead screws 35 are connected by belt drive, and the lead screws 35 pass through the displacement block 31 by threaded connection. A forward and reverse motor 36 connected to any one of the lead screws 35 is installed on the side wall of the receiving frame 33 through a motor cover.

[0046] Furthermore, in this embodiment, the pressure groove unit 32 is installed on the annular stabilizer 321 on the outer wall of the displacement block 31. The outer wall of the annular stabilizer 321 is detachably provided with a plurality of actuators equidistantly distributed along its axial direction. Each actuator includes a plurality of support plates 322 circumferentially and uniformly installed on the outer wall of the annular stabilizer 321. The support plates 322 are detachably connected to the annular stabilizer 321. A bottom support plate 323 is provided between two adjacent support plates 322. The side of the bottom support plate 323 furthest from the annular stabilizer 321 is... The elastic telescopic plate 324 is provided, and a grooving roller 325 for rolling grooves on the inner wall of the core tube 100 is rotatably arranged between the two elastic telescopic plates 324 of the two adjacent support plates 322. The elastic telescopic plate 324 always has a supporting force on the grooving roller 325 away from the annular stabilizer 321, so that the grooving roller 325 pushes outward in the initial state, but does not push out to the inner wall of the core tube 100. That is, when the core tube 100 is sleeved on the outside of the stabilizing shaft 1, the grooving roller 325 can be pressed smoothly to the inner wall of the core tube 100.

[0047] Furthermore, in this embodiment, an air pump 326 is installed inside the displacement block 31, and an annular transfer chamber 327 connected to the exhaust end of the air pump 326 is opened inside the displacement block 31. An electric heating wire 328 is installed inside the annular transfer chamber 327. Multiple circumferentially uniform exhaust ports 329 are also opened at both ends of the displacement block 31. The exhaust ports 329 are connected to the annular transfer chamber 327. An annular air guide cylinder 320 connected to the exhaust port 329 is installed at both ends of the displacement block 31.

[0048] In actual operation, the air pump 326 is started, and the air pump 326 delivers air into the annular transfer chamber 327. The air in the annular transfer chamber 327 is discharged through the exhaust port 329. At the same time, the electric heating wire 328 is started, and the electric heating wire 328 heats the air passing through the exhaust port 329, so that the hot air is blown through the annular air guide tube 320 to the inner wall of the core tube 100 for heating and softening the inner wall of the core tube 100.

[0049] At the same time, the forward and reverse motor 36 is started, which drives the lead screw 35 to rotate back and forth. While the lead screw 35 rotates, it drives the displacement block 31 to move back and forth along the axis of the stabilizing shaft 1. This is used to heat and soften the inner wall of the core tube 100 as a whole. During this period, the grooving roller 325 is always pressed against the inner wall of the core tube 100 under the action of the elastic telescopic plate 324. When the hardness of the inner wall of the core tube 100 is not enough to resist the pressing force of the grooving roller 325, the inner wall of the core tube 100 is rolled into a groove by the grooving roller 325. With the repeated heating, softening and rolling, the groove can be gradually rolled into the inner wall of the core tube 100, thereby completing the processing of the toothed protrusion. When it is necessary to process core tubes 100 of different diameters, the actuator can be removed and replaced with an actuator corresponding to the core tube 100. The position of the grooving roller 325 in the replaced actuator matches the diameter of the core tube 100.

[0050] The heating and rolling process allows for the gradual rolling of grooves into the inner wall of the core tube 100, rather than a one-time forming process. This not only prevents the core tube 100 from overheating and deforming but also improves processing efficiency. It can effectively replace existing extrusion molding and secondary cutting processes, effectively avoiding the deformation of tooth protrusions caused by insufficient local cooling in extrusion molding, and preventing the time-consuming and labor-intensive problems of secondary cutting processes, thereby ensuring the bending strength of the core tube 100.

[0051] In addition, this application also provides a method for machining the inner hole tooth shape of a core tube 100 resistant to bridge bending, including the following steps: S1. Core tube placement: The core tube 100 is lifted by external hoisting equipment and inserted into the outside of the stabilizing shaft 1 from the end of the stabilizing shaft 1 near the second ring frame 231.

[0052] S2. Core tube fixing: Before inserting the core tube 100, start the lifting cylinder 219. The lifting cylinder 219 drives the connecting frame 213 and rollers 214 to move up and down as a whole. Start the drive motor 218. The drive motor 218 drives the double-headed screw 217 to rotate. The double-headed screw 217 drives the moving block 216, the linkage frame 212, the connecting frame 213 and the rollers 214 to move as a whole. This makes the spacing between the rollers 214 on both sides of the stabilizing shaft 1 adjusted according to the outer diameter of the core tube 100. That is, the distance between the axis of the rollers 214 and the stabilizing shaft 1 is equal to the radius of the outer diameter of the core tube 100.

[0053] During this period, the push cylinder 222 is activated, which drives the L-shaped baffle 223 to move closer to the stabilizing shaft 1, so that the horizontal section of the L-shaped baffle 223 fits against the outer wall of the core tube 100 that is about to be fitted onto the outside of the stabilizing shaft 1.

[0054] Subsequently, the hoisting equipment inserts the core tube 100 into one end of the stabilizing shaft 1. The bottom sides of the core tube 100 are supported by rollers 214, allowing it to be smoothly and stably inserted into the outside of the stabilizing shaft 1. Then, the end of the core tube 100 abuts against and is positioned by multiple L-shaped baffles 223, so that the core tube 100 is located in the preset processing position. The core tube 100 is inserted into the gap between two sets of extrusion rollers 237. Then, the output end of the positioning cylinder 233 applies pressure to the abutment block 236, which presses and deforms the extrusion rollers 237, so that the abutment block 236 abuts against the core tube 100, which is used to limit and fix the two ends of the core tube 100 in conjunction with the L-shaped baffles 223. Then, the hoisting equipment is removed from the core tube 100.

[0055] S3. Core tube processing: Start the air pump 326. The air pump 326 delivers air into the annular transfer chamber 327. The air in the annular transfer chamber 327 is heated by the electric heating wire 328 and then blown out onto the inner wall of the core tube 100 to heat and soften the inner wall of the core tube 100.

[0056] The forward and reverse motor 36 is started, which drives the lead screw 35 to rotate back and forth. While the lead screw 35 rotates, it drives the displacement block 31 to move back and forth along the axis of the stabilizing shaft 1. This is used to heat and soften the inner wall of the core tube 100 as a whole. During this process, the grooving roller 325 presses against the inner wall of the core tube 100. When the hardness of the inner wall of the core tube 100 is insufficient to resist the pressing force of the grooving roller 325, the inner wall of the core tube 100 is rolled into a groove by the grooving roller 325. With repeated heating, softening and rolling, grooves can be gradually rolled into the inner wall of the core tube 100, thereby completing the processing of the tooth-shaped protrusion.

[0057] S4. Core tube removal: After the core tube 100 is processed, the positioning cylinder 233 drives the abutment block 236 to reset, so that the extrusion roller 237 resumes rolling contact with the core tube 100, which is used to release the contact limit of the core tube 100. Then, the core tube 100 is removed from the outside of the stabilizing shaft 1 by external hoisting equipment.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0059] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A machining equipment for the inner hole teeth of a core tube resistant to bridge bending, characterized in that, include: Stabilizing shaft (1); The fixing mechanism (2) is set outside the stabilizing shaft (1) and is used to support and limit the stabilizing shaft (1) and the core tube (100). The tooth pressing mechanism (3) includes a displacement block (31) slidably sleeved on the outer wall of the stabilizing shaft (1). The outer wall of the displacement block (31) is provided with a groove pressing unit (32) for rolling grooves on the inner wall of the core tube (100). The groove pressing unit (32) is used to roll multiple annularly distributed grooves on the inner wall of the core tube (100). The grooves are parallel to the axis of the core tube (100), so that adjacent grooves form tooth-shaped protrusions of the core tube (100). The fixing mechanism (2) includes a limiting unit (20) for supporting the core tube (100) to be processed. The limiting unit (20) has a top support assembly (21) for supporting and limiting the core tube (100) externally, and a positioning assembly (22) for blocking the end of the core tube (100). It is used to position the core tube (100) sleeved on the outside of the stabilizing shaft (1) at the processing station. When the core tube (100) is processed with internal tooth shape, the core tube (100) is sleeved on the outside of the stabilizing shaft (1), and the stabilizing shaft (1) and the core tube (100) are fixed in multiple directions by the fixing mechanism (2) and the limiting unit (20). Then, several tooth-shaped protrusions are rolled on the inner wall of the core tube (100) by the pressing unit (32).

2. The equipment for machining the inner hole teeth of a core tube resistant to bridge bending according to claim 1, characterized in that: The top support assembly (21) includes a fixed platform (211) installed below the stabilizing shaft (1). Two linkage frames (212) are symmetrically arranged on the upper end of the fixed platform (211) along the axis of the stabilizing shaft (1). Several rollers (214) are evenly distributed along the axis of the stabilizing shaft (1) through a connecting frame (213) on the upper end of the linkage frame (212). The rollers (214) roll against the outer wall of the core tube (100). After the core tube (100) is sleeved on the outside of the stabilizing shaft (1), the rollers (214) on both sides below the stabilizing shaft (1) abut against the outer wall of the core tube (100) to push the core tube (100) upward and limit its position, so that the core tube (100) and the axis of the stabilizing shaft (1) remain coincident.

3. The equipment for machining the inner hole teeth of a core tube resistant to bridge bending according to claim 1, characterized in that: The positioning component (22) includes a support frame installed on the side wall of the fixed platform (211). The upper end of the support frame is provided with a first annular frame (221) that coincides with the axis of the stabilizing shaft (1). A plurality of push cylinders (222) are installed on the inner wall of the first annular frame (221). The output end of the push cylinder (222) points to the stabilizing shaft (1) and is equipped with an L-shaped baffle (223). The horizontal section of the L-shaped baffle (223) is used to abut against the outer wall of the core tube (100) to provide circumferential external support, and the vertical section of the L-shaped baffle (223) is used to stop the end of the core tube (100) so that the positioned core tube (100) is located at the preset processing position.

4. The equipment for machining the inner hole teeth of a core tube resistant to bridge bending according to claim 1, characterized in that: The fixed platform (211) has two sliding grooves (215) symmetrically distributed along the stabilizing axis (1) at its upper end. A moving block (216) is slidably assembled inside the sliding groove (215), and the linkage frame (212) is installed on the upper end of the moving block (216). Two double-headed screws (217) are symmetrically rotatably mounted on the fixed platform (211) along the length direction of the sliding groove (215). The double-headed screws (217) pass through the moving blocks (216) in the two sliding grooves (215) by means of threaded connection. A drive motor (218) connected to any one of the double-headed screws (217) is provided on the side wall of the fixed platform (211) through a motor base. When the double-headed screw (217) rotates, it drives two moving blocks (216) on its outer wall to move towards each other or away from each other. The moving blocks (216) drive the rollers (214) on both sides of the stabilizing shaft (1) to move synchronously through the linkage frame (212) and the connecting frame (213), which is used to adjust the distance between the two sets of rollers (214) according to the outer diameter of the core tube (100).

5. The equipment for machining the inner hole teeth of a core tube resistant to bridge bending according to claim 1, characterized in that: The linkage frame (212) has two lifting cylinders (219) symmetrically arranged along the length direction at the upper end. The connecting frame (213) is installed on the top of the output end of the lifting cylinder (219). The linkage frame (212) has a guide plate (210) installed at the upper end. The connecting frame (213) has a through hole that slides through the guide plate (210) to provide stable support for the lifting of the connecting frame (213).

6. The equipment for machining the inner hole teeth of a core tube resistant to bridge bending according to claim 1, characterized in that: The fixing mechanism (2) further includes a support unit (23) for supporting and limiting the ends of the core tube (100) and the stabilizing shaft (1). The support unit (23) includes a positioning frame installed on the side of the fixing platform (211) away from the support frame. A second ring frame (231) is provided on the upper end of the positioning frame. Two fixing sleeves (232) located inside the second ring frame (231) are fixedly sleeved on the outer wall of the stabilizing shaft (1). The inner wall of the second ring frame (231) and the outer wall of the fixed sleeve (232) are each equipped with a number of ring-shaped positioning cylinders (233) that are corresponding in position. The output end of the positioning cylinder (233) is provided with a top plate (234). On the side of the top plate (234) away from the positioning cylinder (233), an abutment block (236) is assembled through a mounting plate (235). On the side of the abutment block (236) away from the mounting plate (235), a squeezing roller (237) is rotatably provided.

7. The equipment for machining the inner hole teeth of a core tube resistant to bridge bending according to claim 1, characterized in that: The pressing mechanism (3) also includes a receiving frame (33) installed on the side wall of the first ring frame (221). A positioning plate (34) is fixedly sleeved on the stabilizing shaft (1). Two lead screws (35) are symmetrically rotated between the positioning plate (34) and the receiving frame (33) along the stabilizing shaft (1). The lead screws (35) pass through the displacement block (31) by means of threaded connection. A forward and reverse motor (36) connected to any one of the lead screws (35) is installed on the side wall of the receiving frame (33) through a motor cover.

8. The equipment for machining the inner hole teeth of a core tube resistant to bridge bending according to claim 1, characterized in that: The pressure groove unit (32) is installed on the annular stabilizer (321) on the outer wall of the displacement block (31). The outer wall of the annular stabilizer (321) is detachably provided with a number of actuators that are equidistantly distributed along its axial direction. The actuator includes multiple support plates (322) that are circumferentially and uniformly installed on the outer wall of the annular stabilizer (321). The support plates (322) are detachably connected to the annular stabilizer (321). A bottom support plate (323) is provided between two adjacent support plates (322). An elastic telescopic plate (324) is installed on the side of the bottom support plate (323) away from the annular stabilizer (321). A groove roller (325) for rolling grooves on the inner wall of the core tube (100) is rotatably provided between the two elastic telescopic plates (324) of two adjacent support plates (322).

9. The equipment for machining the inner hole teeth of a core tube resistant to bridge bending according to claim 1, characterized in that: An air pump (326) is installed inside the displacement block (31), and an annular transfer chamber (327) connected to the exhaust end of the air pump (326) is opened inside the displacement block (31). An electric heating wire (328) is installed inside the annular transfer chamber (327). Multiple circumferentially uniform exhaust ports (329) are also opened at both ends of the displacement block (31). The exhaust ports (329) are connected to the annular transfer chamber (327). An annular air guide cylinder (320) connected to the exhaust port (329) is installed at both ends of the displacement block (31).

10. A method for machining the inner hole teeth of a core tube resistant to bridge bending, comprising using the machining equipment for machining the inner hole teeth of a core tube resistant to bridge bending as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Core tube placement: The core tube (100) is lifted by external hoisting equipment and inserted into the outside of the stabilizing shaft (1); S2, Core tube fixing: The core tube (100) is fixed in multiple directions by the fixing mechanism (2); S3, Core tube processing: Tooth-shaped protrusions are processed on the inner wall of the core tube (100) by means of a tooth pressing mechanism (3); S4. Core tube removal: Release the limiting fixation of the core tube (100) and then remove the core tube (100) using hoisting equipment.

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