An overlength bolt chamfering device

Abstract

This invention discloses a chamfering device for extra-long bolts, specifically a chamfering device for extra-long bolts. It includes a support base and two chain conveyor belts installed within the support base. A conveyor belt mounting seat is also fixedly installed within the support base. Two conveyor belt grooves are symmetrically formed on the outer side of the conveyor belt mounting seat, and the two chain conveyor belts are respectively installed in the two conveyor belt grooves. Several pre-positioning mechanisms for placing the extra-long bolt body are equidistantly installed on the outer sides of the two chain conveyor belts. The beneficial effects of this invention are: the extra-long bolt body is clamped by the cooperation of the upper clamping mechanism and multiple lower clamping seats; multiple lower clamping seats are provided at both ends and the middle of the extra-long bolt body, cooperating with the upper clamping seat, effectively preventing bending deformation or cutting vibration of the extra-long bolt under chamfering force; when the extra-long bolt body is clamped, its axis remains completely coaxial with the chamfering blades on both sides, ensuring the accuracy and consistency of the chamfering.

Description

Technical Field

[0001] This invention relates to the field of chamfering equipment technology, specifically to a chamfering device for ultra-long bolts. Background Technology

[0002] In the field of machining, bolts are basic fasteners, and the chamfering of their ends serves to remove burrs, guide assembly, prevent bumps and scratches, and improve stress distribution. The chamfering of bolts of standard length is a relatively mature process, and can usually be completed on ordinary lathes, special chamfering machines, or Swiss-type CNC machine tools by feeding a cutting tool along the end face contour.

[0003] However, the chamfering process for extra-long bolts presents significant technological challenges. Due to their slender shape and extremely poor rigidity, bolts are highly susceptible to bending deformation and cutting vibration under the influence of cutting forces, clamping forces, and their own weight.

[0004] The existing method for chamfering extra-long bolts uses a conventional horizontal lathe with a clamping and support mechanism. During machining, one end of the extra-long bolt is held by a chuck, and the other end is secured with a center. However, without support in the middle, the centrifugal force and radial cutting force during rotation exacerbate the flexural vibration of the extra-long bolt, leading to chatter marks, uneven dimensions, and even tool breakage on the chamfered surface. While adding a center rest or follow rest as auxiliary support can improve rigidity to some extent, the center rest needs to be mounted on the machined cylindrical surface. For fully threaded bolts or rough round steel blanks, it is difficult to find a suitable support position, and adjusting the support claws is time-consuming. Excessive pressure can scratch the workpiece surface, while insufficient pressure renders the support ineffective.

[0005] Another method involves segmented turning and machining, which involves chamfering one end of the extra-long bolt and then turning it around to machine the other end. This method not only increases the number of clamping operations and auxiliary time, but also makes it difficult to ensure the coaxiality and consistency of the chamfers at both ends during the second clamping, easily resulting in tool marks at the junction of the chamfer and the shank, affecting the overall quality. For bolts of extremely long length, the turning operation itself is also very inconvenient and labor-intensive.

[0006] Furthermore, some specialized chamfering equipment is typically designed for short bars or tubes, and its feeding mechanism and support structure cannot adapt to the length and flexibility of ultra-long workpieces, easily leading to safety hazards such as feeding jams and workpiece bending. Although cyclone milling or grinding processes provide better processing quality, they require significant equipment investment and have high process costs, making them uneconomical for simple bolt end chamfering.

[0007] In summary, existing methods for chamfering ultra-long bolts generally suffer from vibration and deformation problems caused by insufficient workpiece rigidity, resulting in poor chamfering quality, low efficiency, complex clamping and support, limited applicability, and difficulty in balancing machining accuracy and production cost. Summary of the Invention

[0008] The purpose of this invention is to provide an ultra-long bolt chamfering device to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: an ultra-long bolt chamfering device, comprising a support base and two chain plate conveyor belts installed in the support base, wherein a conveyor belt mounting seat is also fixedly installed in the support base, and two conveyor belt grooves are symmetrically opened on the outer side of the conveyor belt mounting seat, and the two chain plate conveyor belts are respectively installed in the two conveyor belt grooves; Several pre-positioning mechanisms for placing extra-long bolt bodies are equidistantly installed on the outer sides of the two chain conveyor belts, and the pre-positioning mechanisms on the two chain conveyor belts are distributed in a one-to-one correspondence. The conveyor belt mounting base is equipped with multiple lower clamping seats, which are alternately distributed with the chain conveyor belt; An upper mounting bracket is fixedly installed on the upper end of the support base. An upper clamping mechanism that cooperates with the lower clamping seat is installed on the upper mounting bracket. A synchronous transmission mechanism is installed at one end of the support base. A rotary transmission mechanism is symmetrically installed above the synchronous transmission mechanism. A chamfering blade is symmetrically installed on the side of the two rotary transmission mechanisms that are close to each other. The chamfering blade is connected to the rotary transmission mechanism by a locking mechanism that is easy to install and remove.

[0010] Preferably, the pre-positioning mechanism includes a support cylinder fixedly installed on the chain conveyor belt, the inner side of the support cylinder is provided with a telescopic groove, the inner side wall of the telescopic groove is provided with a limit groove, a telescopic column is slidably installed in the telescopic groove, and an anti-detachment block adapted to the limit groove is fixedly installed on the side of the telescopic column. A primary positioning seat is fixedly installed at the upper end of the telescopic column, and a support spring is provided around the outside of the support cylinder and the telescopic column. The two ends of the support spring abut against the chain plate and the primary positioning seat, respectively.

[0011] Preferably, the upper clamping mechanism includes a hydraulic cylinder that is fixedly installed through the upper end of the upper mounting frame, a lifting plate is fixedly installed at the lower end of the inner rod of the hydraulic cylinder, a guide sleeve is fixedly connected through the upper end of the upper mounting frame, and a sliding rod adapted to the guide sleeve is fixedly connected to the upper end of the lifting plate. Multiple upper clamping seats are fixedly installed at the lower end of the lifting plate, and two sets of top seats are symmetrically fixedly installed on the side of the lifting plate. The top seats are used to push the primary positioning seat to move downward. Ear plates are symmetrically fixedly connected to both sides of the primary positioning seat.

[0012] Preferably, a concave base is fixedly installed at one end of the support base, and concave fixing seats are symmetrically fixedly connected to the upper ends of the two side plates of the concave base, and a through groove is opened at the bottom of the two concave fixing seats. The synchronous transmission mechanism includes a bidirectional transmission screw rotatably mounted between two side plates of the concave base. The two ends of the bidirectional transmission screw are symmetrically sleeved with moving blocks. The upper end of the moving block passes upward through the through slot and is fixedly connected to a movable table. The movable table is slidably mounted in the concave fixed seat. The bidirectional transmission screw is driven by the motor shaft of a reduction motor fixedly mounted on the side of the concave base. The rotary transmission mechanism is rotatably mounted on the side of the movable platform.

[0013] Preferably, the rotary transmission mechanism includes a rotary seat rotatably mounted on the side of the movable table. A rotating shaft is fixedly connected to the side of the rotary seat near the movable table. The rotating shaft is rotatably connected to the movable table through a bearing. The rotating shaft is driven by the output shaft of a servo motor fixedly connected to the side of the movable table. A mating groove for installing a chamfering tool is provided on the side of the rotary seat away from the movable table.

[0014] Preferably, a U-shaped baffle is fixedly installed on the side of a lower clamping seat near the top of the extra-long bolt body, and a calibration component is installed in a chamfering tool near the top of the extra-long bolt body. The inner side of the chamfering tool is provided with a polygonal groove for installing a calibration component. The calibration component includes a polygonal rod that is movably inserted into the polygonal groove. One end of the polygonal rod inside the polygonal groove is provided with a spring groove. A retaining spring is installed in the spring groove. The two ends of the retaining spring are fixedly connected to the bottom of the polygonal groove and the bottom of the spring groove, respectively. A ball is embedded in the end of the polygonal rod outside the polygonal groove.

[0015] Preferably, the outer side of the rotating base is provided with a plurality of locking slots in a ring array, and the inner sidewall of each locking slot is symmetrically provided with grooves. Each locking slot is provided with a locking mechanism for fixing the chamfering tool to the rotating base. The outer side of the rotating seat is also provided with a shrinkage groove and a sliding groove. The outer side of the rotating seat is equipped with a pressing mechanism that drives the locking mechanism to lock the chamfering knife. The shrinkage groove is equipped with a locking mechanism for locking the pressing mechanism.

[0016] Preferably, the locking mechanism includes a pressing column that is slidably installed in the locking groove, and a guide groove is provided through the side of the pressing column; A limiting plate is inserted through the inner side of the guide groove. The two ends of the limiting plate extend into two grooves and are fixedly installed in the grooves by screws. A return spring is installed on the side of the limiting plate away from the chamfering blade. The two ends of the return spring abut against the guide groove and the limiting plate, respectively. A locking head is fixedly connected to the end of the pressing column near the chamfering blade. The locking head extends through the locking groove into the mating groove. The outer side of the regular polygonal column of the chamfering blade has multiple positioning grooves in a ring array. One end of the locking head engages with the adjacent positioning groove.

[0017] Preferably, the extrusion mechanism includes an annular extrusion sleeve that is slidably sleeved on the outer side of the rotating seat. The annular extrusion sleeve has a locking groove on its side and a slider adapted to the groove is fixedly installed on the inner side wall of the annular extrusion sleeve.

[0018] Preferably, the locking mechanism includes a transmission block slidably installed in the shrinkage groove, an upper top spring is fixedly installed on the side of the transmission block near the chamfering blade, one side of the upper top spring abuts against the bottom of the shrinkage groove, and a locking block adapted to the locking groove is fixedly connected to one end of the transmission block.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a reasonable structural design and strong functionality, and has the following advantages: 1. The extra-long bolt body is clamped by the upper clamping mechanism and multiple lower clamping seats. Multiple lower clamping seats are set at both ends and the middle of the extra-long bolt body, and cooperate with the upper clamping seats to effectively prevent the extra-long bolt from bending deformation or cutting vibration when subjected to chamfering force. When the extra-long bolt body is clamped, its axis is completely coaxial with the chamfering cutters on both sides, ensuring the accuracy and consistency of chamfering.

[0020] 2. The pre-positioning mechanism uses spring force to lift the extra-long bolt body, ensuring it remains above the lower clamping seat throughout the conveying process. This avoids movement interference and enables smooth automatic feeding. During clamping, the top seat forcibly presses down on the pre-positioning mechanism, causing the extra-long bolt body to first settle smoothly into the clamping groove on the lower clamping seat, and then completely separate from the pre-positioning mechanism for processing. After the extra-long bolt body separates from the pre-positioning mechanism, the calibration component automatically calibrates the extra-long bolt body, achieving high-precision and automated production. After processing is completed, the upper clamping mechanism releases, and the compressed spring automatically lifts the pre-positioning mechanism, re-lifting the finished part for delivery, ready for the next cycle. The process is seamlessly connected.

[0021] 3. The chamfering cutter integrates a flexible calibration component consisting of springs and balls. Before clamping, it can automatically and gently push the bolt head of the extra-long bolt body to fit against the U-shaped baffle, achieving precise axial positioning of the extra-long bolt body and ensuring the consistency of chamfering depth of the entire batch of extra-long bolt bodies. The synchronous transmission mechanism drives the chamfering cutters on both sides to feed simultaneously, processing both ends of the extra-long bolt body synchronously, which significantly improves production efficiency.

[0022] 4. Through the linkage of the annular extrusion sleeve, the lower pressure column, and the locking block, when installing the tool, simply push the annular extrusion sleeve to the outside of the locking mechanism and the locking stop mechanism. When disassembling, simply press the locking block and pull the annular extrusion sleeve back, without the need for tools. After extrusion is in place, the locking block will automatically spring into the locking groove, locking the annular extrusion sleeve and the rotating seat. In this way, even at high speed, the extrusion mechanism will not loosen due to centrifugal force, eliminating the risk of locking failure and ensuring the stability of the chamfering tool. Attached Figure Description

[0023] Figure 1 This is a three-dimensional view of the ultra-long bolt chamfering device of the present invention; Figure 2 This is a side sectional view of the structure of the ultra-long bolt chamfering device of the present invention; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point B; Figure 5 This is an exploded view of the supporting base, conveyor belt mounting seat, and chain conveyor belt structure of the present invention; Figure 6 This is an exploded view of the upper mounting frame, upper clamping mechanism, synchronous transmission mechanism, and chamfering blade structure of the present invention; Figure 7 This is a perspective view of the upper clamping mechanism, lower clamping seat, and pre-positioning mechanism of the present invention. Figure 8 This is a side sectional view of the structure of the upper clamping mechanism, the lower clamping seat, and the pre-positioning mechanism of the present invention; Figure 9 This is an exploded view of the upper clamping mechanism, lower clamping seat, and pre-positioning mechanism of the present invention; Figure 10 This is a side sectional view of the rotating seat, chamfering blade, locking mechanism, and extrusion mechanism of the present invention; Figure 11 This is an exploded view of the rotating seat, chamfering blade, calibration assembly, locking mechanism, extrusion mechanism, and locking mechanism of the present invention.

[0024] In the diagram: 1. Support base; 11. Conveyor belt mounting seat; 12. Conveyor belt trough; 13. Chain conveyor belt; 14. Lower clamping seat; 15. U-shaped baffle; 16. Upper mounting frame; 17. Concave base; 18. Concave fixing seat; 19. Through groove; 2. Support cylinder; 21. Telescopic groove; 22. Limiting groove; 23. Support spring; 24. Telescopic column; 25. Anti-detachment block; 26. Primary positioning seat; 27. Ear plate; 28. Extra-long bolt body; 3. Hydraulic cylinder; 31. Lifting plate; 32. Slide rod; 33. Upper clamping seat; 34. Top 4. Seat; 4. Two-way transmission screw; 41. Moving block; 42. Movable table; 43. Rotating seat; 44. Docking groove; 45. Shrinkage groove; 46. Locking groove; 47. Groove; 48. Slide groove; 5. Chamfering cutter; 51. Positioning groove; 52. Polygonal groove; 53. Polygonal rod; 54. Ball bearing; 55. Pressing spring; 6. Lower pressure column; 61. Guide groove; 62. Limiting plate; 63. Return spring; 64. Locking head; 7. Annular extrusion sleeve; 71. Locking groove; 72. Slider; 73. Transmission block; 74. Upper top spring; 75. Locking block. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1 to 11 The present invention provides a technical solution: an ultra-long bolt chamfering device, comprising a support base 1 and two chain plate conveyor belts 13 installed in the support base 1. A conveyor belt mounting seat 11 is also fixedly installed in the support base 1. Two conveyor belt grooves 12 are symmetrically opened on the outer side of the conveyor belt mounting seat 11, and the two chain plate conveyor belts 13 are respectively installed in the two conveyor belt grooves 12. Transmission sprockets are installed at both ends of the inner side of the chain plate conveyor belts 13. The transmission sprockets mesh with the chain on the chain plate conveyor belts 13 to provide power. The transmission sprockets are rotatably connected to the conveyor belt mounting seat 11 through a main shaft. The main shaft is driven by the motor shaft of a stepper motor fixedly installed on the side of the support base 1. Several pre-positioning mechanisms for placing extra-long bolt bodies 28 are equidistantly installed on the outer sides of the two chain conveyor belts 13. The pre-positioning mechanisms on the two chain conveyor belts 13 are distributed one-to-one. The two corresponding pre-positioning mechanisms form a group to support and position the extra-long bolt bodies 28, so that the extra-long bolt bodies 28 can span across the two chain conveyor belts 13. The chain conveyor belts 13 drive the extra-long bolt bodies 28 to move through the pre-positioning mechanisms, thereby loading materials. Multiple lower clamping seats 14 are installed on the conveyor belt mounting seat 11. Preferably, there are three lower clamping seats 14. The lower clamping seats 14 are alternately distributed with the chain conveyor belt 13. The multiple lower clamping seats 14 support the two ends and the middle part of the extra-long bolt body 28 respectively, so as to prevent the extra-long bolt body 28 from bending, deforming and cutting vibration during the chamfering process. An upper mounting bracket 16 is fixedly installed on the upper end of the support base 1. The upper mounting bracket 16 spans above multiple lower clamping seats 14. An upper clamping mechanism that cooperates with the lower clamping seats 14 is installed on the upper mounting bracket 16. The multiple lower clamping seats 14 cooperate through the upper clamping mechanism to clamp the extra-long bolt body 28. A synchronous transmission mechanism is installed at one end of the support base 1. A rotary transmission mechanism is symmetrically installed above the synchronous transmission mechanism. A chamfering blade 5 is symmetrically installed on the side of the two rotary transmission mechanisms that are close to each other. The chamfering blade 5 is connected to the rotary transmission mechanism through a locking mechanism that is easy to install and remove.

[0027] Please see Figures 7 to 9 The pre-positioning mechanism includes a support cylinder 2 fixedly installed on the chain conveyor belt 13. The support cylinder 2 is fixedly connected to the chain plate of the chain conveyor belt 13. An extension groove 21 is opened on the inner side of the support cylinder 2. A limit groove 22 is opened on the inner side wall of the extension groove 21. An extension column 24 is slidably installed in the extension groove 21. An anti-detachment block 25 adapted to the limit groove 22 is fixedly installed on the side of the extension column 24. The anti-detachment block 25 is slidably connected to the limit groove 22 to ensure that the extension column 24 slides stably up and down along the support cylinder 2, and at the same time limits the upward extension stroke of the extension column 24 to prevent the extension column 24 from separating from the support cylinder 2. A primary positioning seat 26 is fixedly installed on the upper end of the telescopic column 24. The upper end of the primary positioning seat 26 has a placement groove for placing the extra-long bolt body 28. The placement groove is preferably set as a V-shaped groove so that the extra-long bolt body 28 will not shake or misalign after being placed. A support spring 23 is arranged around the outside of the support cylinder 2 and the telescopic column 24. The two ends of the support spring 23 abut against the chain plate and the primary positioning seat 26 respectively. The support spring 23 applies elastic force to the primary positioning seat 26, so that the primary positioning seat 26 keeps moving away from the chain plate, thereby stably supporting the extra-long bolt body 28.

[0028] The two chain conveyor belts 13 drive the pre-positioning mechanism to move, and the pre-positioning mechanism drives the extra-long bolt body 28 to move, thereby conveying and feeding the extra-long bolt body 28. When the upper clamping mechanism does not clamp the extra-long bolt body 28, the extra-long bolt body 28 is higher than the top of the lower clamping seat 14, that is, the lower clamping seat 14 will not obstruct the movement of the extra-long bolt body 28.

[0029] An auxiliary side plate is fixedly installed at the end of the support base 1 away from the upper mounting bracket 16. When the extra-long bolt body 28 is placed on the primary positioning seat 26, one end of the extra-long bolt body 28 contacts the side of the auxiliary side plate to perform pre-positioning, thereby preventing the position of the extra-long bolt body 28 from being too far off, which would make subsequent calibration impossible.

[0030] Please see Figure 1 , Figure 2 , Figures 6 to 9 The upper clamping mechanism includes a hydraulic cylinder 3 that is fixedly installed through the upper end of the upper mounting frame 16. A lifting plate 31 is fixedly installed at the lower end of the inner rod of the hydraulic cylinder 3. A guide sleeve is fixedly connected through the upper end of the upper mounting frame 16. A sliding rod 32 that is adapted to the guide sleeve is fixedly connected to the upper end of the lifting plate 31. The sliding rod 32 is inserted through and slidably inserted into the guide sleeve, thereby providing guidance for the up and down movement of the sliding rod 32, so that the inner rod of the hydraulic cylinder 3 can stably drive the lifting plate 31 to move up and down. Multiple upper clamping seats 33 are fixedly installed at the lower end of the lifting plate 31. The number of upper clamping seats 33 is the same as the number of lower clamping seats 14. The multiple upper clamping seats 33 are distributed one-to-one above the multiple lower clamping seats 14. It should be noted that the upper clamping seat 33 and the lower clamping seat 14 are symmetrically provided with clamping grooves on their corresponding sides, and anti-slip textures are provided in the clamping grooves, so as to stably clamp the extra-long bolt body 28. Two sets of top seats 34 are symmetrically fixedly installed on the side of the lifting plate 31. The top seats 34 are used to push the primary positioning seat 26 to move downward. The primary positioning seat 26 is symmetrically fixedly connected to ear plates 27 on both sides. There are two top seats 34 in each set. When the chain conveyor belt 13 transports the extra-long bolt body 28 to the lower part of the upper clamping seat 33, multiple top seats 34 are distributed one-to-one above the ear plates 27.

[0031] The following details the process of the upper clamping mechanism and the lower clamping seat 14 clamping the extra-long bolt body 28, and how to separate the extra-long bolt body 28 from the primary positioning seat 26. Specifically, the chain conveyor belt 13 drives intermittently, and the chain conveyor belt 13 drives the extra-long bolt body 28 to move intermittently through the pre-positioning mechanism. When an extra-long bolt body 28 moves to the top of the lower clamping seat 14, the chain conveyor belt 13 stops running. Start the hydraulic cylinder 3, so that the lifting plate 31 drives the upper clamping seat 33 and the top seat 34 to move downward. The top seat 34 first contacts the ear plate 27, and drives the primary positioning seat 26 to move downward through the ear plate 27. At this time, under the action of the weight of the extra-long bolt body 28, the extra-long bolt body 28 moves downward synchronously with the primary positioning seat 26. After the extra-long bolt body 28 moves downward a certain distance, it rests on the upper end of multiple lower clamping seats 14. The multiple lower clamping seats 14 cooperate to support the extra-long bolt body 28, preventing it from moving further downward. At this time, the top seat 34 continues to push the primary positioning seat 26 downward, causing the primary positioning seat 26 to separate from the extra-long bolt body 28. Before the upper clamping seat 33 contacts the extra-long bolt body 28, the hydraulic cylinder 3 is stopped and the position of the extra-long bolt body 28 is calibrated. Specifically, the extra-long bolt body 28 is pushed so that the bolt head of the extra-long bolt body 28 abuts against the side wall of the U-shaped baffle 15. At this time, the calibration of the extra-long bolt body 28 is completed. Restart the hydraulic cylinder 3 to make the lifting plate 31 continue to drive the upper clamping seat 33 to move downward, so that the upper clamping seat 33 is locked at the upper end of the extra-long bolt body 28. The extra-long bolt body 28 is firmly clamped by the cooperation of the upper clamping seat 33 and the lower clamping seat 14. Since there are support components at both ends and the middle of the extra-long bolt body 28, the stability of the extra-long bolt body 28 is guaranteed.

[0032] When the primary positioning seat 26 moves, it drives the telescopic column 24 to insert into the support cylinder 2, and at the same time, the primary positioning seat 26 compresses the support spring 23.

[0033] After the chamfering of the extra-long bolt body 28 is completed, the hydraulic cylinder 3 drives the lifting plate 31 to move upward and reset. The lifting plate 31 drives the upper clamping seat 33 and the top seat 34 to move upward and reset. At this time, the top seat 34 releases the downward push of the ear plate 27, and the upper clamping seat 33 releases the clamping of the extra-long bolt body 28. At this time, under the action of the supporting spring 23, the primary positioning seat 26 is pushed to move upward. The primary positioning seat 26 drives the extra-long bolt body 28 to move upward, so that the extra-long bolt body 28 is separated from the lower clamping seat 14. Then, through the cooperation of the chain conveyor belt 13 and the pre-positioning mechanism, the chamfered extra-long bolt body 28 is moved away from below the upper clamping mechanism. At the same time, the next extra-long bolt body 28 to be chamfered is transported to the top of the lower clamping seat 14, and so on.

[0034] Furthermore, when the extra-long bolt body 28 separates from the primary positioning seat 26 and is clamped by the upper clamping seat 33 and the lower clamping seat 14, the extra-long bolt body 28 is coaxial with the two chamfering blades 5. Through the cooperation of the upper clamping mechanism and the lower clamping seat 14, the extra-long bolt body 28 can be accurately positioned to ensure the accuracy of subsequent chamfering. The chamfering blade 5 is integrally formed by a chamfering head and a regular polygonal column.

[0035] Please see Figure 1 , Figure 2 , Figure 5 and Figure 6A concave base 17 is fixedly installed at one end of the support base 1. Concave fixing seats 18 are symmetrically fixed to the upper ends of the two side plates of the concave base 17. A through groove 19 is opened at the bottom of each of the two concave fixing seats 18. The synchronous transmission mechanism includes a bidirectional transmission screw 4 rotatably mounted between two side plates of the concave base 17. A circular through slot is provided on the side of the conveyor belt mounting seat 11 for the bidirectional transmission screw 4 to pass through. The bidirectional transmission screw 4 passes through the support base 1 and is rotatably connected to the support base 1 through a bearing. The bidirectional transmission screw 4 is a round rod with left-hand threads and right-hand threads symmetrically opened at both ends. Moving blocks 41 are symmetrically sleeved at both ends of the bidirectional transmission screw 4. The bidirectional transmission screw 4 is threadedly connected to the moving blocks 41. The upper end of the moving blocks 41 passes upward through the through slot 19 and is fixedly connected to a movable platform 42. The movable platform 42 is slidably mounted in the concave fixed seat 18. The bidirectional transmission screw 4 is driven by the motor shaft of the reduction motor fixedly mounted on the side of the concave base 17. To ensure the stability of the sliding of the movable platform 42, stabilizing grooves are symmetrically provided on the inner side of the concave fixed base 18, and stabilizing plates that are compatible with the stabilizing grooves are symmetrically fixed on both sides of the movable platform 42. The stabilizing plates are slidably connected to the adjacent stabilizing grooves, thereby providing guidance for the movable platform 42 and preventing the movable platform 42 from wobbling up and down during the chamfering process. The rotary transmission mechanism is rotatably mounted on the side of the movable platform 42. The two moving blocks 41 are driven to move closer or further apart by the rotation of the bidirectional transmission screw 4. The moving blocks 41 slide along the through groove 19. The two moving blocks 41 drive the two movable platforms 42 to move closer or further apart, and the movable platforms 42 drive the two rotary transmission mechanisms to move closer or further apart. The synchronous transmission mechanism enables two rotary transmission mechanisms to drive two chamfering cutters 5 to move synchronously closer to or further away from the extra-long bolt body 28, ensuring the efficiency of chamfering. The two chamfering cutters 5 approach the extra-long bolt body 28 to chamfer it. After the chamfering is completed, the two chamfering cutters 5 move away from each other and will not hinder the movement of the extra-long bolt body 28.

[0036] To prevent chamfering debris and impurities from falling off at will, a debris collection box is symmetrically fixedly installed on the upper end of the support base 1. The debris collection box is located below the chamfering cutter 5. During the chamfering process of the chamfering cutter 5 on the extra-long bolt body 28, debris and impurities can fall into the debris collection box.

[0037] Please see Figure 1 , Figure 2 and Figure 6The rotary transmission mechanism includes a rotary seat 43 rotatably mounted on the side of the movable platform 42. A rotating shaft is fixedly connected to the side of the rotary seat 43 near the movable platform 42. The rotating shaft is rotatably connected to the movable platform 42 through a bearing. The rotating shaft is driven by the output shaft of a servo motor fixedly connected to the side of the movable platform 42. A docking groove 44 for mounting a chamfering tool 5 is provided on the side of the rotary seat 43 away from the movable platform 42.

[0038] When installing the chamfering tool 5, simply insert the regular polygonal column of the chamfering tool 5 into the mating groove 44; During chamfering, the output shaft of the servo motor drives the rotating shaft to rotate, and the rotating shaft drives the chamfering cutter 5 to rotate through the rotating seat 43. The chamfering cutter 5 is used to chamfer the extra-long bolt body 28.

[0039] Please see Figure 2 , Figure 4 and Figure 11 In order to calibrate the position of the extra-long bolt body 28, a U-shaped baffle 15 is fixedly installed on the side of a lower clamping seat 14 near the top of the extra-long bolt body 28. The top of the extra-long bolt body 28 refers to the bolt head. The U-shaped baffle 15 is installed on the side of the lower clamping seat 14 near the bolt head. A calibration component is installed in a chamfering tool 5 near the top of the extra-long bolt body 28. The extra-long bolt body 28 is accurately positioned by the cooperation of the calibration component and the U-shaped baffle 15. The inner side of the chamfering tool 5 is provided with a polygonal groove 52 for installing a calibration component. The calibration component includes a polygonal rod 53 that is movably inserted into the polygonal groove 52. One end of the polygonal rod 53 in the polygonal groove 52 is provided with a spring groove. A retaining spring 55 is installed in the spring groove. The two ends of the retaining spring 55 are fixedly connected to the bottom of the polygonal groove 52 and the bottom of the spring groove, respectively. The retaining spring 55 applies a spring force to the polygonal rod 53, so that the polygonal rod 53 always maintains the tendency to slide outward along the polygonal groove 52. A ball bearing 54 is embedded in the end of the polygonal rod 53 outside the polygonal groove 52.

[0040] When the synchronous transmission mechanism drives the two chamfering blades 5 to approach the two ends of the extra-long bolt body 28, the ball bearings 54 in the calibration assembly first contact the bolt head of the extra-long bolt body 28. At this time, under the action of the spring force of the clamping spring 55, the ball bearings 54 push the extra-long bolt body 28 to move until the bolt head of the extra-long bolt body 28 contacts the side of the U-shaped baffle 15, so that the extra-long bolt body 28 can no longer move, thus completing the calibration and positioning of the extra-long bolt body 28. The specific operation is as follows: when the lower clamping mechanism pushes the primary positioning seat 26 downward to separate the extra-long bolt body 28 from the primary positioning seat 26, the hydraulic cylinder 3 is stopped. At this time, the two chamfering blades 5 move close to the extra-long bolt body 28. After the calibration mechanism completes the calibration and positioning of the extra-long bolt body 28, the chamfering blades 5 stop moving or move slowly. During this process, the hydraulic cylinder 3 is activated, so that the upper clamping seat 33 and the lower clamping seat 14 cooperate to clamp the extra-long bolt body 28. After that, the chamfering cutter 5 will contact the extra-long bolt body 28 to perform chamfering.

[0041] Specifically, after clamping the extra-long bolt body 28, the chamfering cutter 5 continues to move closer to the extra-long bolt body 28. Since the ball 54 is pressed against the bolt head of the extra-long bolt body 28, the ball 54 and the polygonal rod 53 cannot continue to move. However, the chamfering cutter 5 continues to move, so that the polygonal groove 52 of the chamfering cutter 5 fits on the outside of the polygonal rod 53. At the same time, the clamping spring 55 is compressed. Under the action of the elastic force of the clamping spring 55, the ball 54 is firmly pressed against one end of the extra-long bolt body 28.

[0042] During the chamfering process, the chamfering tool 5 uses ball bearings 54 to create a rolling connection between the calibration component and the end of the extra-long bolt body 28, which does not hinder the normal chamfering process.

[0043] Please see Figures 2 to 4 , Figure 10 and Figure 11 The outer side of the rotating base 43 is provided with a plurality of locking slots 46 in a ring array. The inner sidewall of each locking slot 46 is symmetrically provided with grooves 47. Each locking slot 46 is provided with a locking mechanism for fixing the chamfering tool 5 to the rotating base 43. The outer side of the rotating seat 43 is also provided with a shrinkage groove 45 and a sliding groove 48. The outer side of the rotating seat 43 is equipped with a pressing mechanism that drives the locking mechanism to lock the chamfering knife 5. The shrinkage groove 45 is equipped with a locking mechanism for locking the pressing mechanism to prevent the pressing mechanism from loosening during the rotation of the rotating seat 43.

[0044] Please see Figures 2 to 4 , Figure 10 and Figure 11 The locking mechanism includes a pressing column 6 that is slidably installed in the locking groove 46. A guide groove 61 is provided through the side of the pressing column 6. The end of the pressing column 6 near the opening of the locking groove 46 is set as a spherical surface or an inclined surface to facilitate the pressing mechanism to press the pressing column 6. The inner side of the guide groove 61 is movably inserted into the limiting plate 62. Both ends of the limiting plate 62 extend into the two grooves 47, and the limiting plate 62 is fixedly installed in the grooves 47 by screws. A return spring 63 is installed on the side of the limiting plate 62 away from the chamfering blade 5. Both ends of the return spring 63 abut against the guide groove 61 and the limiting plate 62 respectively. The return spring 63 applies elastic force to the pressing column 6, so that the pressing column 6 maintains the tendency to slide outward along the locking groove 46. A locking head 64 is fixedly connected to the end of the pressing column 6 near the chamfering blade 5. The locking head 64 extends through the locking groove 46 into the mating groove 44. The outer side of the regular polygonal column of the chamfering blade 5 is provided with multiple positioning grooves 51 in a ring array. The number of positioning grooves 51 is the same as the number of locking mechanisms. One end of the locking head 64 is engaged with the adjacent positioning groove 51.

[0045] The following details how the extrusion mechanism drives the locking mechanism to lock the chamfering blade 5, thus fixing the chamfering blade 5 relative to the rotating seat 43. Initially, the pressing mechanism does not contact the locking mechanism, and at this time the locking head 64 does not extend into the mating groove 44; Specifically, when installing the chamfering tool 5, first insert the regular polygonal column of the chamfering tool 5 into the mating groove 44, so that the positioning groove 51 is aligned with the locking head 64, and then push the pressing mechanism to press the pressing column 6 into the locking groove 46, so that the pressing column 6 retracts and moves into the locking groove 46. At this time, the guide groove 61 of the pressing column 6 slides along the limiting plate 62, the pressing column 6 squeezes the reset spring 63, and the pressing column 6 drives the locking head 64 to be inserted into the positioning groove 51, thereby locking the chamfering knife 5. When disassembling the chamfering tool 5, the pressing mechanism is moved away from the outside of the locking mechanism. At this time, the pressing mechanism is separated from the lower pressing column 6, and the pressing on the lower pressing column 6 is released. At this time, under the action of the return spring 63, the pressing column 6 is pushed to slide outward along the locking groove 46. The pressing column 6 drives the locking head 64 to move out of the positioning groove 51, and the locking of the chamfering knife 5 is released, so that the chamfering knife 5 can be pulled out from the mating groove 44. When fixing the chamfering cutter 5, simply insert the chamfering cutter 5 into the mating groove 44 and push the pressing mechanism to automatically lock the chamfering cutter 5. When disassembling, simply remove the pressing mechanism to automatically release the locking mechanism from the chamfering cutter 5. The disassembly and installation of the chamfering cutter 5 are simple and convenient, greatly improving the efficiency of the installation and disassembly of the chamfering cutter 5.

[0046] Please see Figures 2 to 4 , Figure 10 and Figure 11The extrusion mechanism includes an annular extrusion sleeve 7 that is slidably sleeved on the outer side of the rotating seat 43. A locking groove 71 is provided on the side of the annular extrusion sleeve 7. A slider 72 that is adapted to the slide groove 48 is fixedly installed on the inner side wall of the annular extrusion sleeve 7. The slider 72 is slidably connected to the slide groove 48. The annular extrusion sleeve 7 is guided by the slider 72 and the slide groove 48, so that the annular extrusion sleeve 7 can slide stably along the rotating seat 43. At the same time, the rotating seat 43 can drive the annular extrusion sleeve 7 to rotate synchronously.

[0047] Please see Figures 2 to 4 , Figure 10 and Figure 11 The locking mechanism includes a transmission block 73 that is slidably installed in the shrinkage groove 45. An upper spring 74 is fixedly installed on the side of the transmission block 73 near the chamfering blade 5. One side of the upper spring 74 abuts against the bottom of the shrinkage groove 45. The upper spring 74 applies a spring force to the transmission block 73. One end of the transmission block 73 is fixedly connected to a locking block 75 that is adapted to the locking groove 71. The locking block 75 passes through the rotating seat 43 and is slidably connected to the rotating seat 43.

[0048] The following details how the extrusion mechanism drives the locking mechanism, and how the locking mechanism locks the extrusion mechanism.

[0049] Specifically, when installing and fixing the chamfering blade 5, manually push the annular compression sleeve 7 so that the annular compression sleeve 7 gradually fits onto the outside of multiple locking mechanisms. During this process, the annular compression sleeve 7 first contacts the lower pressure column 6, and pushes the lower pressure column 6 into the locking groove 46 through the annular compression sleeve 7, thereby locking the chamfering blade 5 by the locking mechanism. When the annular extrusion sleeve 7 is pushed, the transmission block 73 is pressed into the shrinkage groove 45. The transmission block 73 presses the upper spring 74, and the transmission block 73 drives the locking block 75 to shrink into the shrinkage groove 45. When the annular extrusion sleeve 7 is sleeved on the outside of the locking block 75, and the locking groove 71 on the annular extrusion sleeve 7 is aligned with the locking block 75, the pressure on the transmission block 73 is released. Under the action of the elastic force of the upper spring 74, the transmission block 73 drives the locking block 75 to slide outward along the shrinkage groove 45, so that the locking block 75 is inserted into the locking groove 71, thereby locking the annular extrusion sleeve 7 and fixing the annular extrusion sleeve 7 and the rotating seat 43 relative to each other.

[0050] When disassembling the chamfering cutter 5, first press the transmission block 73 into the shrinkage groove 45 to move the locking block 75 out of the locking groove 71, release the lock on the annular compression sleeve 7, then move the annular compression sleeve 7 away from the outside of the locking block 75 and the locking mechanism, release the press on the transmission block 73, and under the action of the elastic force of the upper spring 74, the transmission block 73 and the locking block 75 are reset, and the locking mechanism is reset at the same time.

[0051] Working principle: First, the extra-long bolt body 28 is placed on the pre-positioning mechanism of the two chain conveyor belts 13. The extra-long bolt body 28 is initially positioned by the cooperation of the V-groove at the upper end of the primary positioning seat 26 and the auxiliary side plate.

[0052] The chain conveyor belt 13 is driven by a stepper motor to make intermittent movements, and the prepositioning mechanism carrying the extra-long bolt body 28 is precisely delivered to the processing station, that is, directly above the lower clamping seat 14. After the extra-long bolt body 28 reaches the work station, the hydraulic cylinder 3 drives the lifting plate 31 to descend. The top seat 34 first presses down the ear plate 27 of the primary positioning seat 26, so that the extra-long bolt body 28 descends together with the primary positioning seat 26 until the bottom of the extra-long bolt body 28 lands smoothly on multiple lower clamping seats 14. At this time, the extra-long bolt body 28 is rigidly supported to prevent bending. At this time, the top seat 34 continues to press down, forcibly separating the primary positioning seat 26 from the extra-long bolt body 28. At this time, the hydraulic cylinder 3 stops. Subsequently, the two chamfering cutters 5 on both sides are driven to approach the two ends of the extra-long bolt body 28 through the synchronous transmission mechanism. The calibration component inside the chamfering cutter 5 near the bolt head will push the extra-long bolt body 28 until the bolt head is in close contact with the U-shaped baffle 15, thus completing the axial precise positioning of the extra-long bolt body 28. After the calibration of the extra-long bolt body 28 is completed, the hydraulic cylinder 3 is started again, so that the upper clamping seat 33 is clamped on the upper end of the extra-long bolt body 28. The upper clamping seat 33 and the lower clamping seat 14 cooperate to firmly clamp the two ends and the middle part of the extra-long bolt body 28. At this time, the extra-long bolt body 28 and the chamfering knife 5 are in a completely coaxial state.

[0053] The rotary transmission mechanism is activated, which drives the chamfering cutter 5 to chamfer both ends of the extra-long bolt body 28. After the chamfering is completed, the hydraulic cylinder 3 is reset, and the upper clamping seat 33 and the top seat 34 are raised. Under the elastic force of the support spring 23, the primary positioning seat 26 is raised again and lifts the processed extra-long bolt body 28, so that the extra-long bolt body 28 is separated from the lower clamping seat 14 and sent out by the chain conveyor belt 13. At the same time, the next set of extra-long bolt bodies 28 to be processed enters the work station.

[0054] The geared motor drives the bidirectional transmission screw 4 to rotate, which in turn drives the two moving blocks 41 and their movable table 42 and rotary transmission mechanism to move towards each other, so as to realize the synchronous processing of the two ends of the bolt by the chamfering cutter 5 on both sides; the servo motor drives the rotating seat 43 to drive the chamfering cutter 5 to rotate at high speed, perform chamfering cutting, and the generated chips fall into the chip collection box below.

[0055] During the feed process, the ball bearings 54 of the calibration assembly elastically hold the bolt end against the clamping spring 55. As the chamfering cutter 5 continues to feed, the polygonal rod 53 compresses the spring and retracts into the polygonal groove 52. This ensures positioning before machining and prevents rotation from being hindered during chamfering through the rolling contact of the ball bearings 54.

[0056] Insert the regular polygonal column of the chamfering blade 5 into the mating groove 44 of the rotating seat 43, and then press down the transmission block 73 in the locking mechanism while pushing the annular compression sleeve 7 towards the locking mechanism; the annular compression sleeve 7 will press down the pressing column 6, causing it to overcome the elastic force of the return spring 63 and retract inward, thereby pushing the locking head 64 into the positioning groove 51 of the chamfering blade 5, thus completing the locking of the chamfering blade 5.

[0057] When the annular extrusion sleeve 7 is pushed into place, the transmission block 73 is released, and the upper spring 74 will spring the locking block 75 into the locking groove 71 of the annular extrusion sleeve 7 to fix the annular extrusion sleeve 7 and ensure that the tool will never loosen when rotating at high speed.

[0058] When disassembly and replacement are required, simply press the transmission block 73 again to disengage the locking block 75 from the locking groove 71, and then pull the annular compression sleeve 7 back to its original position. At this time, the lower pressing column 6 of the locking mechanism will automatically spring back under the action of the return spring 63, and the locking head 64 will be pulled out from the positioning groove 51, allowing the chamfering blade 5 to be removed directly.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ultra-long bolt chamfering device, comprising a support base (1) and two chain plate conveyor belts (13) installed in the support base (1), wherein a conveyor belt mounting seat (11) is also fixedly installed in the support base (1), and two conveyor belt grooves (12) are symmetrically opened on the outer side of the conveyor belt mounting seat (11), and the two chain plate conveyor belts (13) are respectively installed in the two conveyor belt grooves (12); Its features are: Several pre-positioning mechanisms for placing extra-long bolt bodies (28) are equidistantly installed on the outer sides of the two chain conveyor belts (13), and the pre-positioning mechanisms on the two chain conveyor belts (13) are distributed one-to-one. Multiple lower clamping seats (14) are installed on the conveyor belt mounting base (11), and the lower clamping seats (14) and the chain plate conveyor belt (13) are alternately distributed; The upper end of the support base (1) is fixedly installed with an upper mounting bracket (16). The upper mounting bracket (16) is equipped with an upper clamping mechanism that cooperates with the lower clamping seat (14). One end of the support base (1) is equipped with a synchronous transmission mechanism. A rotary transmission mechanism is symmetrically installed above the synchronous transmission mechanism. A chamfering blade (5) is symmetrically installed on the side of the two rotary transmission mechanisms that are close to each other. The chamfering blade (5) is connected to the rotary transmission mechanism through a locking mechanism that is easy to install and remove.

2. The chamfering device for ultra-long bolts according to claim 1, characterized in that: The pre-positioning mechanism includes a support cylinder (2) fixedly installed on the chain conveyor belt (13). The inner side of the support cylinder (2) is provided with a telescopic groove (21). The inner side wall of the telescopic groove (21) is provided with a limiting groove (22). A telescopic column (24) is slidably installed in the telescopic groove (21). An anti-detachment block (25) adapted to the limiting groove (22) is fixedly installed on the side of the telescopic column (24). A primary positioning seat (26) is fixedly installed at the upper end of the telescopic column (24), and a support spring (23) is provided around the outside of the support cylinder (2) and the telescopic column (24). The two ends of the support spring (23) abut against the chain plate and the primary positioning seat (26) respectively.

3. The chamfering device for ultra-long bolts according to claim 2, characterized in that: The upper clamping mechanism includes a hydraulic cylinder (3) that is fixedly installed through the upper end of the upper mounting frame (16). A lifting plate (31) is fixedly installed at the lower end of the inner rod of the hydraulic cylinder (3). A guide sleeve is fixedly connected through the upper end of the upper mounting frame (16). A sliding rod (32) that is adapted to the guide sleeve is fixedly connected to the upper end of the lifting plate (31). Multiple upper clamping seats (33) are fixedly installed at the lower end of the lifting plate (31), and two sets of top seats (34) are symmetrically fixedly installed on the side of the lifting plate (31). The top seats (34) are used to push the primary positioning seat (26) to move downward. Ear plates (27) are symmetrically fixedly connected to both sides of the primary positioning seat (26).

4. The chamfering device for ultra-long bolts according to claim 1, characterized in that: A concave base (17) is fixedly installed at one end of the support base (1). Concave fixing seats (18) are symmetrically fixed at the upper ends of the two side plates of the concave base (17). A through groove (19) is opened at the bottom of the two concave fixing seats (18). The synchronous transmission mechanism includes a bidirectional transmission screw (4) rotatably mounted between two side plates of the concave base (17). The two ends of the bidirectional transmission screw (4) are symmetrically sleeved with moving blocks (41). The upper end of the moving block (41) passes through the through groove (19) and is fixedly connected to a movable table (42). The movable table (42) is slidably mounted in the concave fixed seat (18). The bidirectional transmission screw (4) is driven by the motor shaft of the reduction motor fixedly mounted on the side of the concave base (17). The rotary transmission mechanism is rotatably mounted on the side of the movable platform (42).

5. The chamfering device for ultra-long bolts according to claim 4, characterized in that: The rotary transmission mechanism includes a rotary seat (43) rotatably mounted on the side of the movable platform (42). A rotating shaft is fixedly connected to the side of the rotary seat (43) near the movable platform (42). The rotating shaft is rotatably connected to the movable platform (42) through a bearing. The rotating shaft is driven by the output shaft of a servo motor fixedly connected to the side of the movable platform (42). A docking groove (44) for installing a chamfering tool (5) is provided on the side of the rotary seat (43) away from the movable platform (42).

6. The chamfering device for ultra-long bolts according to claim 5, characterized in that: A U-shaped baffle (15) is fixedly installed on the side of a lower clamping seat (14) near the top of the ultra-long bolt body (28), and a calibration component is installed in a chamfering tool (5) near the top of the ultra-long bolt body (28). The chamfering tool (5) has a polygonal groove (52) for installing a calibration component on its inner side. The calibration component includes a polygonal rod (53) that is movably inserted into the polygonal groove (52). One end of the polygonal rod (53) inside the polygonal groove (52) has a spring groove. A retaining spring (55) is installed in the spring groove. The two ends of the retaining spring (55) are fixedly connected to the bottom of the polygonal groove (52) and the bottom of the spring groove, respectively. A ball bearing (54) is embedded in the end of the polygonal rod (53) outside the polygonal groove (52).

7. The chamfering device for ultra-long bolts according to claim 5, characterized in that: The outer side of the rotating base (43) is provided with a plurality of locking slots (46) in a ring array. Each locking slot (46) has a groove (47) symmetrically provided on its inner sidewall. Each locking slot (46) is provided with a locking mechanism for fixing the chamfering tool (5) on the rotating base (43). The outer side of the rotating seat (43) is also provided with a shrinkage groove (45) and a sliding groove (48). The outer side of the rotating seat (43) is equipped with a pressing mechanism that drives the locking mechanism to lock the chamfering knife (5). The shrinkage groove (45) is equipped with a locking mechanism for locking the pressing mechanism.

8. The chamfering device for ultra-long bolts according to claim 7, characterized in that: The locking mechanism includes a pressing post (6) that is slidably installed in the locking groove (46), and a guide groove (61) is provided through the side of the pressing post (6). The inner side of the guide groove (61) is movably inserted into the limiting plate (62). The two ends of the limiting plate (62) extend into the two grooves (47), and the limiting plate (62) is fixedly installed in the grooves (47) by screws. A return spring (63) is installed on the side of the limiting plate (62) away from the chamfering knife (5). The two ends of the return spring (63) abut against the guide groove (61) and the limiting plate (62) respectively. A locking head (64) is fixedly connected to one end of the pressing column (6) near the chamfering knife (5). The locking head (64) extends through the locking groove (46) into the docking groove (44). The outer side of the regular polygonal column of the chamfering knife (5) is provided with multiple positioning grooves (51) in a ring array. One end of the locking head (64) is engaged with the adjacent positioning groove (51).

9. A chamfering device for ultra-long bolts according to claim 8, characterized in that: The extrusion mechanism includes an annular extrusion sleeve (7) that is slidably sleeved on the outer side of the rotating seat (43). The annular extrusion sleeve (7) has a locking groove (71) on its side and a slider (72) that is adapted to the sliding groove (48) is fixedly installed on the inner side wall of the annular extrusion sleeve (7).

10. A chamfering device for ultra-long bolts according to claim 9, characterized in that: The locking mechanism includes a transmission block (73) that is slidably installed in the shrinkage groove (45). An upper spring (74) is fixedly installed on the side of the transmission block (73) near the chamfering knife (5). One side of the upper spring (74) abuts against the bottom of the shrinkage groove (45). A locking block (75) that is compatible with the locking groove (71) is fixedly connected to one end of the transmission block (73).

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