Hexagonal head reinforced rod bolt and production equipment and production process thereof

Abstract

The application discloses a hexagonal head reinforced rod bolt and a production equipment and a production process thereof, relates to the fastener processing technical field, and aims to solve the technical problem of frequent replacement of equipment and cutters in the processing of internal complex bolts, and comprises a pipeline main body, a drilling mechanism and a limiting cylinder. The application realizes accurate drilling of the straight inner cavity through the motor driving assembly; a plurality of splicing cylinders are sequentially arranged in the axial direction at the output end of the limiting cylinder, the splicing cylinders are limited in the rotating angle through mutual abutment through the abutment surface when deflected, and the plurality of splicing cylinders can form an arc-shaped structure which is accurately matched with the curvature of the arc-shaped inner cavity; at the same time, the adjusting assembly on the side surface of the splicing cylinder controls the hinge deflection direction of the plurality of splicing cylinders through the pneumatic driving mode, the drill bit group is switched between the straight running state and the arc-shaped offset state, and the integrated drilling forming of the straight inner cavity and at least two arc-shaped inner cavities is sequentially completed on the same equipment without replacing the cutter or re-clamping.

Description

Technical Field

[0001] This invention relates to the field of fastener processing technology, and more specifically, to a hexagonal head reinforcing bar bolt and its production equipment and process. Background Technology

[0002] Hexagonal head reinforcing bolts are widely used in critical connection applications in various mechanical equipment, construction projects, and nuclear power facilities due to their high head strength and strong shank load-bearing capacity. As industrial equipment demands increasing connection reliability and assembly precision, the functional requirements for these bolts are constantly expanding. Traditional bolts primarily serve a single locking and fixing function. When faced with dirt and debris on the inner wall of the threaded hole, they lack self-cleaning capabilities. Dirt easily accumulates on the threaded mating surface during screwing, leading to incomplete locking or damage to the thread profile. Furthermore, during long-term service, bolts are susceptible to corrosion and seizing due to vibration, temperature differences, and humid environments, severely impacting subsequent disassembly and maintenance.

[0003] In terms of bolt cavity machining equipment, the small size and large depth-to-diameter ratio of hexagonal head reinforcing bolts, coupled with the evolving internal cavity structure of high-performance bolts from traditional single axial through holes to complex combinations of straight internal cavities and multiple arc-shaped internal cavities, place higher demands on machining equipment. However, most existing drilling equipment can only achieve linear feed cutting. For multi-segment arc-shaped internal cavities arranged in a ring array, electrical discharge machining (EDM), specialized angle heads, or multiple clamping operations on different equipment are typically required to complete the machining segment by segment. EDM is inefficient and costly, making it difficult to meet the needs of mass production. Specialized angle heads are limited by the narrow internal space of the bolt and cannot reach into the slender internal cavity for arc-shaped trajectory machining. Multiple clamping operations are not only cumbersome and time-consuming, but the changes in positioning reference caused by re-clamping significantly affect the relative positional accuracy and angular consistency between the arc-shaped internal cavities, making it difficult to guarantee product quality stability. Furthermore, existing drilling equipment lacks effective means to suppress radial runout of the cutting tool and a chip removal structure in deep hole machining. Slender drill bits are prone to wobble during high-speed rotation and feeding, further affecting the dimensional accuracy and surface quality of the internal cavity, thus hindering the efficient and high-precision manufacturing of this type of high-performance bolt. In view of this, we propose a hexagonal head reinforcing bar bolt and its manufacturing equipment and process. Summary of the Invention

[0004] The purpose of this invention is to provide a hexagonal head reinforcing bar bolt and its production equipment and process, so as to solve the technical problem of frequent equipment and tool changes required when machining bolts with complex internal structures.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hexagonal head reinforcing bar bolt and its production equipment and process, comprising: The main body of the production line is equipped with a clamping mechanism, which is used to clamp and fix the workpiece; A drilling mechanism is arranged on the main body of the production line and corresponds to the position of the clamping mechanism. The drilling mechanism includes a linear feed assembly, a motor drive assembly, and a drill bit shaft connected to the output end of the motor drive assembly. A limiting sleeve is fitted over the outside of the drill bit rod body; A plurality of splicing cylinders are sequentially hinged along the axial direction of the limiting cylinder at the output end of the limiting cylinder. The opposing surfaces of two adjacent splicing cylinders are provided with abutting surfaces. The abutting surfaces are used to abut against each other when the splicing cylinders deflect to limit the rotation angle, so that the plurality of splicing cylinders form an arc-shaped structure that adapts to the arc-shaped inner cavity. An adjustment component, located on the side surface of the splicing cylinder, is used to pneumatically control the hinge deflection direction of several splicing cylinders, thereby enabling the drill bit assembly located at the end of the splicing cylinder to switch between a straight-line state and an arc-shaped offset state. This invention provides a production equipment for hexagonal head reinforcing rod bolts. The workpiece is reliably clamped and fixed by a clamping mechanism on the main body of the production line. Combined with the linear feed component and motor drive component of the drilling mechanism, the linear feed and high-speed rotation of the drill bit shaft are achieved, completing precise drilling of the straight-line inner cavity. By sequentially hinged splicing cylinders along the axial direction at the output end of the limiting cylinder, and with abutment surfaces provided on the opposite faces of adjacent splicing cylinders, the splicing cylinders can deflect... The contact surfaces abut against each other to limit the rotation angle, thereby ensuring that several splicing cylinders can form an arc structure that precisely matches the curvature of the arc-shaped inner cavity. At the same time, by using the adjustment components set on the side surface of the splicing cylinders, the hinge deflection direction of several splicing cylinders is controlled by pneumatic drive, realizing the rapid and stable switching of the drill bit group between the straight state and the arc-shaped offset state. Thus, the integrated drilling and forming of the straight inner cavity and at least two arc-shaped inner cavities can be completed sequentially on the same equipment. The continuous processing of complex inner cavities can be achieved without changing the tool or reclamping, which greatly improves the processing efficiency and the inner cavity forming accuracy, and effectively solves the technical problem of the difficulty in processing multi-directional arc-shaped inner cavities inside bolts in the existing technology.

[0006] Preferably, the drilling mechanism further includes a support frame, which is fixedly connected to the feed slide of the linear feed assembly. The support frame is provided with an annular sleeve, and the surface of the annular sleeve is provided with a plurality of discharge holes. The limiting cylinder is sleeved inside the support frame, and the drill bit rod is rotatably sleeved inside the limiting cylinder.

[0007] Preferably, each of the splicing cylinders is rotatably fitted with a chip removal ring, and the chip removal ring is provided with several blades, forming a chip removal channel between two adjacent blades; two adjacent chip removal rings are connected by a universal joint, and the drill bit assembly is fixedly connected to the chip removal ring at the end.

[0008] Preferably, the adjustment component includes two sets of modified atmosphere modules, which are symmetrically arranged on the side surfaces of the plurality of splicing cylinders, and are used to adjust the rotation direction of the plurality of splicing cylinders to deflect to both sides respectively.

[0009] Preferably, the modified atmosphere module includes several fixing frames, receiving cylinders, conduits, gas boxes, plugs, and a first spring; the fixing frames are respectively fixedly connected to the side surface of the splicing cylinder, and the receiving cylinders are fixedly connected to the side of the fixing frames; the conduits communicate between two adjacent receiving cylinders, the gas box slides in a sealed manner inside the receiving cylinder, the plug is slidably sleeved inside the gas box, and the first spring is disposed inside the gas box and elastically adapted to the plug.

[0010] Preferably, the output end of the receiving cylinder is provided with a spherical interface, and the inner wall of the receiving cylinder is fixedly connected to a conical interface, the surface of which is provided with a plurality of air holes; the ball head of the conduit is connected to the inside of the spherical interface, and the output end of the conduit is fixedly connected to the air box; in two adjacent receiving cylinders, the conduit on part of the receiving cylinder is inserted into the inside of the other receiving cylinder, and the conical interface on part of the receiving cylinder is inserted into the inside of the air box on the other receiving cylinder.

[0011] Preferably, the receiving cylinder near the drill bit assembly is fixedly connected to a first pipe, and the receiving cylinder away from the drill bit assembly is fixedly connected to a second pipe. The first pipe and the second pipe are arranged within the wall thickness of the limiting cylinder. Both the first pipe and the second pipe are metal corrugated pipe structures, which are used to bend and deform with the splicing cylinder during its deflection and unfolding process.

[0012] Preferably, the main body of the production line is further provided with a linear conveying mechanism, a driving mechanism, and a gripper mechanism; the gripping mechanism includes a fixed base, a gripping sleeve mounted on the fixed base, and an elastic chuck arranged in the gripping sleeve.

[0013] A hexagonal head reinforcing bar bolt, comprising: The bolt body includes an integrally formed hexagonal head, a smooth reinforcing shank, and an externally threaded shank. The elongated inner cavity is located at the axis of the bolt body. The elongated inner cavity includes a straight inner cavity and at least two arc-shaped inner cavities arranged in a ring array with the straight inner cavity as the center. The input ends of the arc-shaped inner cavity are respectively arranged at the thread groove and thread crest of the external thread rod segment, which are used to scrape off dirt and store it inside the straight inner cavity when screwing into the component to be fastened, and to store liquid media and allow it to seep out during service.

[0014] A manufacturing process for a hexagonal head reinforcing bar bolt includes the following steps: S1. Clamping and positioning: The bolt semi-finished product is placed into the clamping mechanism through the gripper mechanism, and the bolt semi-finished product is clamped and fixed by the clamping sleeve and elastic chuck, and then moved to the processing station; S2, Straight-line inner cavity cutting: The drill bit rod is fed and rotated by the linear feed component and motor drive component of the drilling mechanism, and a straight-line inner cavity is formed at the axis of the bolt body. S2.1, Arc-shaped inner cavity cutting: After the drill bit rod is fed to the predetermined depth, the gas is extracted through the first pipe of the adjustment component, so that several splicing cylinders are hinged and deflected in the first direction under negative pressure to form an arc-shaped structure, which drives the drill bit assembly to offset and cut to form the first arc-shaped inner cavity. S2.2, Arc-shaped inner cavity reversing cutting: By adjusting the second pipe of the component to fill with gas, several splicing cylinders are unfolded, reset and extracted. Then, the gas is extracted again through the first pipe, causing several splicing cylinders to hinge and deflect in the second direction opposite to the first direction, cutting and forming the second arc-shaped inner cavity. S3. Retract the tool: After processing, the drill bit rod and splicing cylinder retract and reset, the clamping mechanism resets and the material is unloaded.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention provides a production equipment for hexagonal head reinforcing rod bolts. The equipment reliably clamps and fixes the workpiece using a clamping mechanism on the main body of the production line. Combined with the linear feed assembly and motor drive assembly of the drilling mechanism, it achieves linear feed and high-speed rotation of the drill bit shaft, completing precise drilling of the straight-line inner cavity. By sequentially hinged several splicing cylinders along the axial direction at the output end of the limiting cylinder, and setting abutment surfaces on the opposite faces of adjacent splicing cylinders, the splicing cylinders deflect by contacting each other through the abutment surfaces to limit the rotation angle. This ensures that the several splicing cylinders can form a shape with precise curvature of the arc-shaped inner cavity. The system features a suitable arc-shaped structure. Simultaneously, by using an adjustment component located on the side surface of the splicing cylinder, the hinge deflection direction of several splicing cylinders is controlled via pneumatic drive. This enables rapid and stable switching of the drill bit assembly between straight and arc-shaped offset states, allowing for the sequential integrated drilling and forming of straight inner cavities and at least two arc-shaped inner cavities on the same equipment. Continuous processing of complex inner cavities can be achieved without changing tools or re-clamping, significantly improving processing efficiency and inner cavity forming accuracy. This effectively solves the technical challenge of processing multi-directional arc-shaped inner cavities within bolts in existing technologies.

[0016] 2. The production equipment for hexagonal head reinforcing rod bolts provided by this invention, through the sequential arrangement of a linear conveying mechanism, a driving mechanism, a gripper mechanism, and a clamping mechanism in the main body of the production line, realizes fully automated continuous production of the bolt body from feeding, clamping and positioning to drilling, significantly improving production efficiency; the clamping mechanism uses a clamping sleeve to circumferentially limit the hexagonal head and cooperates with an elastic chuck to radially clamp the smooth reinforcing rod section, ensuring that the bolt does not shift or deflect during high-speed drilling, thus guaranteeing the machining accuracy of the slender inner cavity; the drilling mechanism adopts a drill bit body with a linear feed component and a motor drive component, and through the synergistic action of the support frame, limiting sleeve, and discharge hole, effectively constrains the radial runout of the drill bit body and achieves smooth discharge of chips and coolant, ensuring drilling stability and machining quality; at the same time, through the hinged deflection of the splicing sleeve and the blade channel design of the chip removal ring, the contour cutting of the arc-shaped inner cavity and the directional conveying of chips are realized, significantly improving the forming accuracy and machining efficiency of the arc-shaped inner cavity.

[0017] 3. The adjustment component provided by this invention precisely controls the rotation direction of several splicing cylinders through two sets of symmetrically arranged gas-adjustable modules. Each gas-adjustable module adopts a cooperative structure of a receiving cylinder, a conduit, an air box, a plug, and a first spring. Combined with the negative pressure drive of the first pipe and the positive pressure drive of the second pipe, it achieves stable switching between the arc-shaped bending state and the straight-line contraction state of the splicing cylinders. Specifically, by extracting gas through the first pipe to create a negative pressure inside the receiving cylinder, each splicing cylinder is driven to hinge and deflect to one side in sequence, forming an arc-shaped structure adapted to the arc-shaped inner cavity, thus achieving precise offset of the drill bit assembly. The gas is supplied through the second pipe, which causes each splicing cylinder to unfold axially and return to a straight-line arrangement, completing the retraction and reset. This pneumatic adjustment method is responsive and precise. Combined with the first and second pipes of the metal corrugated pipe structure, the pipe walls remain straight and do not dry out under repeated bending and expansion conditions, ensuring the continuity and reliability of the gas supply. This enables at least two arc-shaped inner cavities arranged in a ring array to be processed sequentially with the straight inner cavity as the center inside the same bolt, which greatly improves the processing range and process flexibility of the drilling mechanism, while improving the consistency and dimensional accuracy of the arc-shaped inner cavity processing.

[0018] 4. The present invention provides a hexagonal head reinforcing rod bolt, which, by opening a slender inner cavity at the center of the bolt body consisting of a straight inner cavity and at least two arc-shaped inner cavities arranged in a ring array, and by placing the input ends of the arc-shaped inner cavities at the thread groove and the thread crest respectively, allows the arc-shaped inner cavity opening to simultaneously scrape away dirt from the inner wall of the thread hole and store it inside the straight inner cavity during the bolt's screwing into the threaded hole of the component to be fastened, thus achieving a self-cleaning function and effectively avoiding problems such as incomplete tightening or thread damage caused by the accumulation of debris. At the same time, the slender inner cavity also functions as an oil reservoir. After injecting rust-preventive lubricating oil or extreme pressure anti-wear grease through the central through hole of the hexagonal head, the liquid medium can be slowly seeped out through the input end of the arc-shaped inner cavity during the bolt's service life by means of vibration, temperature difference or external pressure, and uniformly coated on the thread mating surface to form a continuous protective oil film. This not only reduces the screwing friction torque during initial installation and prevents seizing, but also effectively delays the corrosion and wear of the thread pair through a slow-release effect during long-term use, significantly improving the repeated disassembly and assembly performance and service life of the connection pair. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a schematic diagram of the overall structure of the drilling mechanism of the present invention.

[0021] Figure 3 This is a partial cross-sectional structural diagram of the drilling mechanism of the present invention.

[0022] Figure 4 This is a three-dimensional partial structural diagram of the drilling mechanism of the present invention.

[0023] Figure 5 This is a three-dimensional cross-sectional view of the drilling mechanism of the present invention, showing the internal structure of the splicing cylinder.

[0024] Figure 6 This is a three-dimensional enlarged structural diagram of the splicing tube of the present invention.

[0025] Figure 7 This is a schematic cross-sectional view of the overall structure of the adjustment component of the present invention.

[0026] Figure 8 This is a three-dimensional magnified structural diagram of the adjustment component of the present invention.

[0027] Figure 9 This is a schematic cross-sectional view of the adjustment component of the present invention.

[0028] Figure 10 This is a schematic diagram of the bolt body structure of the present invention.

[0029] Figure 11This is a schematic diagram of the cross-sectional structure of the bolt body of the present invention, showing the cross-sectional structure of the slender inner cavity.

[0030] The following are the labels in the diagram: 1. Bolt body; 11. Slender inner cavity; 2. Production line main body; 3. Drilling mechanism; 31. Drill bit shaft; 32. Support frame; 33. Limiting sleeve; 34. Splicing sleeve; 35. Chip removal ring; 36. Universal joint; 37. Drill bit assembly; 4. Adjustment component; 41. Fixing frame; 42. Receiving sleeve; 43. Tapered interface; 44. Conduit; 45. Air box; 46. First spring; 47. Plug; 48. First pipe; 49. Second pipe. Detailed Implementation

[0031] Example 1: like Figures 10-11 As shown, the present invention relates to a hexagonal head reinforcing bar bolt, comprising a bolt body 1.

[0032] Specifically, the bolt body 1 includes an integrally formed hexagonal head, a smooth reinforcing shank, and an externally threaded shank. The hexagonal head is located at the top of the bolt body, and the lower end of the hexagonal head has an annular limiting step end face. A through hole connecting the internal cavity is opened at the center of the hexagonal head. The smooth reinforcing shank is coaxially and integrally connected to the lower part of the hexagonal head, forming a pressure-bearing and reinforcing structure for the bolt body. The lower end of the smooth reinforcing shank is integrally connected to the externally threaded shank, and the outer wall of the externally threaded shank is surrounded by a continuous thread profile. The largest protruding profile of the outer diameter of the thread profile is the thread crest. The depression between two adjacent thread crests is a groove.

[0033] The bolt body 1 has a slender inner cavity 11 along its vertical axis at its center. This slender inner cavity 11 consists of a straight inner cavity and at least two arc-shaped inner cavities arranged in a ring around the straight inner cavity. One arc-shaped inner cavity has its input end located at one of the two grooves, and the other arc-shaped inner cavity has its input end located at the thread crest. The bolt achieves locking by directly screwing its external thread into the threaded hole of the component to be fastened, thus requiring no nut. During use, as the bolt body 1 is screwed into the component, the arc-shaped inner cavity openings located at the grooves and thread crests scrape away debris from the inner wall of the threaded hole of the component. Entering the straight inner cavity allows for the removal of dirt and grime. Simultaneously, a liquid medium (such as rust-preventive lubricating oil or extreme pressure anti-wear grease) is filled into this elongated inner cavity 11. A measured amount of liquid medium is injected into the elongated inner cavity 11 through the central through-hole of the hexagonal head before or during bolt insertion. After the bolt is tightened to the predetermined torque, the liquid medium stored in the elongated inner cavity 11 is slowly expelled through the arc-shaped inner cavity input end located at the groove and thread crest, utilizing the vibration and temperature difference effects during bolt service, or through external auxiliary pressurization. This liquid medium is evenly coated on the mating surfaces of the external thread section and the threaded hole of the component to be tightened, forming a continuous protective oil film. This design reduces thread insertion friction torque and prevents seizing during initial installation, and effectively delays corrosion and wear of the threaded pair during long-term use through the slow-release effect of the built-in oil reservoir, significantly improving the repeated disassembly and assembly performance and service life of the connection pair.

[0034] This invention provides a hexagonal head reinforcing bolt, which, by opening a slender inner cavity 11 at the center of the bolt body 1, consisting of a straight inner cavity and at least two arc-shaped inner cavities arranged in a ring array, and positioning the input ends of the arc-shaped inner cavities at the thread groove and thread crest positions respectively, allows the arc-shaped inner cavity openings to simultaneously scrape away dirt from the inner wall of the threaded hole and store it inside the straight inner cavity during the bolt's insertion into the threaded hole of the component to be fastened, achieving a self-cleaning function and effectively avoiding problems such as incomplete tightening or thread damage caused by the accumulation of debris; simultaneously The slender inner cavity 11 also functions as an oil reservoir. After injecting rust-preventive lubricating oil or extreme pressure anti-wear grease through the central through hole of the hexagonal head, the liquid medium can be slowly seeped out through the arc-shaped inner cavity input end during the bolt's service life by means of vibration, temperature difference or external pressure, and evenly coated on the thread mating surface to form a continuous protective oil film. This can reduce the screwing friction torque during initial installation and prevent seizing, and can also effectively delay the corrosion and wear of the thread pair through the slow release effect during long-term use, significantly improving the repeated disassembly and assembly performance and service life of the connection pair.

[0035] Example 2: like Figures 1-2 As shown, the present invention relates to a production equipment for hexagonal head reinforcing rod bolts, comprising a production line body 2.

[0036] Specifically, the main body 2 of the production line is an automated continuous production line, with a linear conveying mechanism, a driving mechanism, a gripper mechanism, and a clamping mechanism arranged sequentially along its conveying direction. The driving mechanism drives the clamping mechanism to reciprocate along a linear direction, allowing it to clamp and fix the bolt body 1. The gripper mechanism, after the clamping mechanism has moved and reset, clamps the bolt body 1 onto the gripper mechanism. At least one drilling mechanism 3 is arranged on the main body 2, and the drilling mechanism 3 corresponds to the position of the clamping mechanism. The linear conveying mechanism includes components along the main body of the production line. 2. A linear guide rail is fixedly installed along its length, and a slide table is slidably fitted onto the linear guide rail. A clamping mechanism is fixedly installed above the slide table. The drive mechanism is a cylinder drive assembly or a servo motor driven screw and nut assembly, the power output end of which is connected to the slide table transmission to drive the clamping mechanism to reciprocate between the unloading station and the processing station. The gripper mechanism is arranged at the unloading station of the main body 2 of the production line, and includes a fixed bracket, a pneumatic gripper mounted on the fixed bracket, and an auxiliary cylinder for driving the pneumatic gripper to lift or rotate. The clamping end of the pneumatic gripper is provided with a shape adapted to the bolt body 1. The conformal clamp is used to pick up the bolt body 1 from the upstream feeding device and accurately place the bolt body 1 into the clamping mechanism after the clamping mechanism moves and resets to the unloading position. The clamping mechanism includes a fixed base, a clamping sleeve mounted on the fixed base, and an elastic chuck arranged inside the clamping sleeve. The inner cavity of the clamping sleeve is adapted to the shape of the hexagonal head of the bolt body 1 to circumferentially limit the hexagonal head of the bolt body 1. The elastic chuck is fitted outside the smooth reinforcing rod section of the bolt body 1 and axially fixes the bolt body 1 through radial clamping force to ensure its stability during subsequent processing or inspection. No displacement or deflection occurs during the process; the clamping mechanism is also equipped with a position sensor. When the clamping mechanism moves to the processing station under the drive of the linear conveyor mechanism, the position sensor sends a positioning signal, triggering the subsequent processing equipment to process the bolt body 1 fixed on the clamping mechanism; after the processing is completed, the drive mechanism drives the clamping mechanism to reset to the unloading station, and the gripper mechanism moves again to take the processed bolt body 1 out of the clamping mechanism and transfer it to the unloading channel. At the same time, a new bolt body 1 to be processed is placed into the clamping mechanism, thus realizing automated continuous production in this cycle.

[0037] like Figures 2-3As shown, the drilling mechanism 3 in this embodiment includes a linear feed assembly, a motor drive assembly, and a drill bit body 31 arranged at the output end of the motor drive assembly. The linear feed assembly includes a feed bracket fixedly mounted on the main body 2 of the production line, a linear guide rail fixedly arranged on the feed bracket along the feed direction, and a feed slide slidably fitted on the linear guide rail. A feed drive cylinder or servo feed motor is driven to one side of the feed slide to drive the feed slide to reciprocate along the linear guide rail toward or away from the clamping mechanism, thereby realizing the axial feed and retraction action of the bolt body 1. The motor drive assembly is fixedly mounted on the feed slide and includes a drive motor and a transmission spindle connected to the output end of the drive motor. The drive motor is a high-speed servo motor. A variable frequency speed-regulating motor is used to provide the rotational power required for drilling; the transmission spindle is connected to the output shaft of the drive motor via a coupling; the drill bit body 31 is detachably installed in the tool chuck, and its axial centerline coincides with the axial centerline of the bolt body 1 held by the clamping mechanism, and the surface of the drill bit body 31 is provided with spiral grooves to discharge debris, etc.; the end of the drill bit body 31 is provided with a cutting edge, the diameter of which matches the diameter of the slender inner cavity 11 to be processed; driven by the linear feed assembly, the drill bit body 31 feeds along the axial direction of the bolt body 1, cuts in from the central through hole of the hexagonal head, and drills in sequence inside the bolt body 1 to form a straight inner cavity and at least two arc-shaped inner cavities arranged in a ring array with the straight inner cavity as the center.

[0038] Combination Figures 3-6As shown, in this embodiment, the drilling mechanism 3 further includes a support frame 32. A rod arranged on the support frame 32 is fixedly connected to one side of the feed slide, meaning the support frame 32 moves synchronously with the feed slide. A ring-shaped sleeve arranged on the support frame 32 has several discharge holes arranged in a ring array on its surface. These discharge holes penetrate the sleeve wall of the ring sleeve and are used to discharge metal chips and cooling lubricant generated during drilling from inside the ring sleeve to the outside, preventing chip accumulation from affecting drilling accuracy. A limiting cylinder 33 is sleeved inside the support frame 32, and the drill bit body 31 is rotatably sleeved inside the limiting cylinder 33. The limiting cylinder 33 has a hollow cylindrical structure, and its inner diameter is clearance-fitted with the outer diameter of the drill bit body 31, used to constrain the radial runout of the drill bit body 31, ensuring the running stability and coaxiality of the drill bit body 31 during drilling. Several splicing cylinders 34 are arranged along the axis of the output end of the limiting cylinder 33. Each pair of adjacent splicing cylinders 34 is hinged together, meaning that adjacent splicing cylinders 34 are connected by... A hinge or pin enables a rotatable connection. One of the splicing cylinders 34 is fixedly connected to the output end of the limiting cylinder 33. The outer diameter of the splicing cylinder 34 is smaller than that of the limiting cylinder 33. Two splicing cylinders 34 have abutting surfaces on their opposing faces, causing any two splicing cylinders 34 to abut against each other during rotation, thus restricting the rotation of any two splicing cylinders 34. This allows several splicing cylinders 34 to form an arc-shaped structure that fits the arc-shaped inner cavity during rotation. Each splicing cylinder 34 has... A chip removal ring 35 is rotatably sleeved, with one end of the chip removal ring 35 fixedly connected to the output end of the drill bit body 31. The chip removal ring 35 has several blades arranged on it, and a channel is formed between each two adjacent blades. During the rotation of the chip removal ring 35, chips can be discharged from the channel. Two adjacent chip removal rings 35 are connected by a universal joint 36. A drill bit assembly 37 is fixedly connected to one side of the other end of the chip removal ring 35. The outer diameter of the drill bit assembly 37 is the same as the outer diameter of the limiting cylinder 33.

[0039] It is worth noting that the drill bit assembly 37 is existing technology and will not be described in detail here. It has an arc-shaped cutting edge and a chip guide slope. The types of drill bits that are compatible with the drill bit assembly 37 include: arc-shaped drill bits, whose cutting edges are arc-shaped and are specially used for machining arc-shaped internal cavities. During the cutting process, the chips enter several chip removal rings 35 in sequence with the cutting fluid and are finally discharged from the spiral groove on the surface of the drill bit shaft 31.

[0040] Specifically, when cutting the straight inner cavity, the drill bit 31 rotates at high speed under the drive of the motor drive assembly. The feed drive cylinder or servo feed motor drives the feed slide to feed the drill bit 31 at a constant speed towards the bolt body 1. At this time, several splicing cylinders 34 are arranged in a linear array along the axis of the drill bit 31, and the drill bit assembly 37 cuts along the axis of the bolt body 1. When cutting the arc-shaped inner cavity, the drill bit 31 feeds to a predetermined depth and then pauses axial feed. The feed slide continues to advance forward, and several splicing cylinders 34 extend out of the limiting cylinder 33 and advance. As the drill bit assembly 37 enters the straight inner cavity, the splicing cylinders 34 near the drill bit assembly 37 begin to hinge sequentially to one side, with their contact surfaces abutting each other. This causes several splicing cylinders 34 to form an arc-shaped structure that fits the arc-shaped inner cavity. The drill bit assembly 37 deflects along with the ends of the splicing cylinders 34, gradually drilling into the wall thickness of the bolt body 1. In the combined motion of rotation and arc feed, it cuts the side wall of the straight inner cavity, forming the first arc-shaped inner cavity. After the first arc-shaped inner cavity is formed, the feed slide is driven by a feed drive cylinder or servo feed motor to move several splicing cylinders 34 and the drill bit assembly 37 from... The bolt body 1 is removed from the interior. During this removal process, the two splicing cylinders 34 closest to the drill bit shaft 31 are preferentially hinged and deflected, allowing these splicing cylinders 34 to be pulled out of the machined arc-shaped inner cavity first. The remaining splicing cylinders 34 are then hinged and deflected sequentially and gradually pulled out of the arc-shaped inner cavity until several splicing cylinders 34 completely exit the arc-shaped inner cavity and return to a straight state arranged in a linear array along the axis of the drill bit shaft 31, entering the straight inner cavity. Subsequently, the feed slide advances forward again, and several splicing cylinders 34 extend out again and enter the straight inner cavity. The splicing cylinders 34 near the drill bit assembly 37 begin to hinge sequentially to the opposite side of the first hinge direction, with each contact surface abutting against the other, causing several splicing cylinders 34 to form an arc-shaped structure that fits the arc-shaped inner cavity. The drill bit assembly 37 deflects to the other side as the end of the splicing cylinders 34 deflects, gradually drilling into the wall thickness of the bolt body 1. In the combined motion of rotation and arc feed, it cuts the side wall of the straight inner cavity on the opposite side, forming the second arc-shaped inner cavity. In this way, the drilling and forming of at least two arc-shaped inner cavities arranged in a ring array with the straight inner cavity as the center is completed.

[0041] This invention provides a production equipment for hexagonal head reinforcing rod bolts. The main body 2 of the production line sequentially arranges a linear conveying mechanism, a driving mechanism, a gripper mechanism, and a clamping mechanism, achieving fully automated continuous production of the bolt body 1 from material feeding, clamping and positioning to drilling, significantly improving production efficiency. The clamping mechanism uses a clamping sleeve to circumferentially limit the hexagonal head and, in conjunction with an elastic chuck, radially clamps the smooth reinforcing rod section, ensuring that the bolt does not shift or deflect during high-speed drilling, thus guaranteeing the machining accuracy of the slender inner cavity 11. The drilling mechanism 3 uses a drill bit body 31 with a linear feed assembly and a motor drive assembly. Through the synergistic action of the support frame 32, the limiting sleeve 33, and the discharge hole, the radial runout of the drill bit body 31 is effectively constrained, and the smooth discharge of chips and coolant is achieved, ensuring drilling stability and machining quality. Simultaneously, through the hinged deflection of the splicing sleeve 34 and the blade channel design of the chip removal ring 35, contour cutting of the arc-shaped inner cavity and directional chip conveying are achieved, significantly improving the forming accuracy and machining efficiency of the arc-shaped inner cavity.

[0042] like Figures 7-9 As shown, the drilling mechanism 3 in this embodiment also includes an adjustment component 4, which is located at the output end of the limiting cylinder 33.

[0043] As shown in the figure, in this embodiment, the adjustment component 4 includes two sets of modified atmosphere modules; the two sets of modified atmosphere modules are symmetrically arranged on the side surfaces of several splicing cylinders 34, wherein the two sets of modified atmosphere modules adjust the rotation direction of the several splicing cylinders 34; the two sets of modified atmosphere modules are completely identical in structure and function, therefore, any one of the modified atmosphere modules will now be described: The modified atmosphere module includes several mounting brackets 41, each corresponding to a position on a splicing cylinder 34 and fixedly connected to the side surface of the splicing cylinder 34. Each mounting bracket 41 has a receiving cylinder 42 fixedly connected to one side. The output end of the receiving cylinder 42 has a spherical interface, and a conical interface 43 is fixedly connected to the inner wall of one side of the receiving cylinder 42. The surface of the conical interface 43 has several air holes arranged in a circular array. A conduit 44 is arranged between two adjacent receiving cylinders 42, with its ball head connected to the inside of the spherical interface. The output end of the conduit 44 is fixedly connected to an air box 45. On two adjacent receiving cylinders 42, the conduit 44 on one receiving cylinder 42 is inserted into the inside of the other receiving cylinder 42. 45 is sealed and slides inside the receiving cylinder 42. The conical interface 43 on one of the receiving cylinders 42 is inserted into the air box 45 on the other receiving cylinder 42. Several insert rods are fixedly connected in a ring array on both sides of the inner wall of the air box 45. A first spring 46 is sleeved on the surface of each insert rod. A plug 47 is slidably sleeved inside the air box 45. The ends of several insert rods pass through the plug 47. The plug 47 is elastically adapted to the first spring 46. The receiving cylinder 42 near the drill bit assembly 37 is fixedly connected to the first pipe 48, and the first pipe 48 passes through several fixing brackets 41. The receiving cylinder 42 away from the drill bit assembly 37 is fixedly connected to the second pipe 49. The first pipe 48 and the second pipe 49 are arranged within the wall thickness of the limiting cylinder 33.

[0044] It is worth noting that the first pipe 48 and the second pipe 49 are metal corrugated pipe structures made of stainless steel strip through spiral folding and seaming or annular corrugation forming processes. They possess axial expansion and contraction capabilities and good bending performance, allowing them to bend and deform along with the splicing cylinder 34 during its deflection and unfolding. Furthermore, the pipe wall has sufficient circumferential stiffness and compressive strength, ensuring that the pipe wall remains straight and does not shrivele or buckle under a gas supply pressure of 0.4MPa to 0.8MPa. Simultaneously, the pipe exterior can be covered with a metal braided layer or a spiral spring sheath to further enhance tensile and compressive strength, preventing damage to the pipe under repeated bending and expansion conditions and ensuring the continuity of gas delivery. This metal corrugated pipe is a well-known existing technology in the field of pneumatic piping and is widely used in pipe connection applications requiring repeated bending, expansion, and vibration. Here, its selection and application are only discussed in the specific application environment of this embodiment and will not be elaborated further.

[0045] Specifically, when gas is extracted through the first pipe 48, the inside of the receiving cylinder 42 near the drill bit assembly 37 is under negative pressure. Due to the pressure difference on both sides, the plug 47 arranged inside the receiving cylinder 42 moves towards the conical interface 43, compressing the first spring 46. This causes the central through-hole of the plug 47 to misalign with the small-diameter end of the conical interface 43, resulting in a connecting air passage between two adjacent receiving cylinders 42 via the air box 45 and the conduit 44. As the negative pressure continues, the receiving cylinder 42 near the drill bit assembly 37 is pushed towards the adjacent receiving cylinder 42 by the air pressure. The receiving cylinders 42 move in the direction of convergence, thereby bringing two adjacent receiving cylinders 42 together. This convergence action is transmitted step by step through the ball joint of the conduit 44 and the ball joint of the spherical interface, starting from the splicing cylinder 34 near the drill bit assembly 37 and proceeding in sequence away from the drill bit assembly 37. This causes several splicing cylinders 34 to deflect relative to each other at each hinge point, forming an arc-shaped structure that matches the arc-shaped inner cavity. This allows the drill bit assembly 37 to shift to one side and gradually drill into the wall thickness of the bolt body 1, completing the cutting and shaping of the arc-shaped inner cavity in that direction. This is achieved through the second conduit 49. During gas filling, compressed air enters the receiving cylinder 42, which is away from the drill bit assembly 37, through the second pipe 49. This pushes the conduit 44 and the air box 45 inside the receiving cylinder 42 towards the drill bit assembly 37. Simultaneously, the first spring 46 releases its elastic potential energy to exert a force on the plug 47, causing the plug 47 to move away from the conical interface 43 and fit against the inner wall of one side of the air box 45. The outer peripheral wall of the plug 47 seals against the inner wall of the air box 45, forming a closed sealed cavity between the air box 45 and the receiving cylinder 42. As the compressed air continues to flow... As filling continues, the pressure inside the sealed cavity increases. Under the pressure of air, the guide tube 44 pushes the adjacent receiving tube 42 through its ball end to move towards the drill bit assembly 37. This pushing force is transmitted step by step along the guide tube 44, causing several receiving tubes 42 from near the limiting tube 33 to far away from the limiting tube 33 to unfold axially in sequence. During the unfolding process, each splicing tube 34 is restored to a linear array arrangement along the axis of the drill bit shaft 31 in sequence, so that the splicing tube 34 and the drill bit assembly 37 can be smoothly pulled out from the processed arc-shaped inner cavity, completing the retraction action.

[0046] The adjustment component 4 provided by this invention precisely controls the rotation direction of several splicing cylinders 34 through two sets of symmetrically arranged gas-adjustable modules. Each gas-adjustable module adopts a cooperative structure of receiving cylinder 42, conduit 44, air box 45, plug 47 and first spring 46. With the negative pressure drive of the first pipe 48 and the positive pressure drive of the second pipe 49, the splicing cylinder 34 can be stably switched between an arc-shaped bending state and a straight retracted state. Specifically, by drawing gas out of the first pipe 48, the receiving cylinder 42 is made to have a negative pressure, which drives each splicing cylinder 34 to hinge and deflect to one side in sequence and form an arc-shaped structure that matches the arc-shaped inner cavity, thus realizing the drill bit The precise offset feed of group 37; the gas filling through the second pipe 49 causes each splicing cylinder 34 to unfold axially in sequence and return to a straight-line arrangement, completing the tool retraction and reset; this pneumatic adjustment method is responsive and precise, and together with the first pipe 48 and the second pipe 49 of the metal corrugated pipe structure, the pipe wall remains straight and does not dry out under repeated bending and expansion conditions, ensuring the continuity and reliability of the air supply. Thus, at least two arc-shaped inner cavities arranged in a ring array are sequentially processed inside the same bolt with the straight inner cavity as the center, which greatly improves the processing range and process flexibility of the drilling mechanism, while improving the consistency and dimensional accuracy of the arc-shaped inner cavity processing.

[0047] Example 3: The manufacturing process of a production equipment for hexagonal head reinforcing bar bolts is as follows: S1. Clamping and Positioning: The gripper mechanism picks up the semi-finished bolts that have completed thread rolling from the upstream feeding device. After the clamping mechanism moves and resets to the unloading station, the semi-finished bolts are accurately placed into the clamping mechanism. The clamping sleeve circumferentially limits the hexagonal head of the semi-finished bolts. The elastic chuck is fitted onto the outside of the smooth reinforcing rod section and the semi-finished bolts are axially fixed by radial clamping force. The clamping mechanism moves to the processing station under the drive of the linear conveyor mechanism. The position sensor sends an arrival signal, triggering the drilling mechanism 3 to start.

[0048] S2. Straight-line internal cavity cutting: Driven by the feed drive cylinder or servo feed motor, the feed slide of the drilling mechanism 3 drives the high-speed rotating drill bit 31 to feed towards the bolt semi-finished product. The cutting edge at the end of the drill bit 31 cuts into the central through hole of the hexagonal head and advances in a straight line along the axial direction of the bolt body 1. In the combined motion of rotation and axial feed, the material at the axial center is gradually removed, and a straight-line internal cavity is formed by drilling. During this process, several splicing cylinders 34 are kept in a straight-line arrangement inside the limiting cylinder 33, and the spiral groove on the surface of the drill bit 31 discharges the chips generated by cutting outward.

[0049] S2.1, Arc-shaped inner cavity cutting: After the drill bit shaft 31 is fed to the predetermined depth, the axial feed is paused, and the feed slide continues to advance. Several splicing cylinders 34 extend out of the limiting cylinder 33 and enter the already processed straight inner cavity. Gas is extracted through the first pipe 48, so that the inside of the receiving cylinder 42 near the drill bit assembly 37 is under negative pressure. Each splicing cylinder 34 is driven by air pressure to hinge and deflect in the first direction until the abutting surfaces on adjacent splicing cylinders 34 abut against each other. Several splicing cylinders 34 form an arc-shaped structure that matches the first arc-shaped inner cavity. The drill bit assembly 37 shifts to the first processing trajectory with the end of the splicing cylinder 34. The feed slide continues to advance, and the drill bit assembly 37 rotates at high speed while making arc-shaped feed motion along the arc trajectory to cut and form the first arc-shaped inner cavity.

[0050] S2.2, Arc-shaped inner cavity cutting: After the drill bit shaft 31 is fed to the predetermined depth, the axial feed is paused, and the feed slide continues to advance. Several splicing cylinders 34 extend out of the limiting cylinder 33 and enter the machined straight inner cavity. Gas is extracted through the first pipe 48, so that the inside of the receiving cylinder 42 near the drill bit assembly 37 is under negative pressure. Each splicing cylinder 34 is driven by air pressure to hinge and deflect in the first direction until the abutting surfaces on adjacent splicing cylinders 34 abut against each other. Several splicing cylinders 34 form an arc-shaped structure that matches the first arc-shaped inner cavity. The drill bit assembly 37 shifts to the first machining trajectory with the end of the splicing cylinder 34. The feed slide continues to advance, and the drill bit assembly 37 rotates at high speed while making arc-shaped feed motion along the arc trajectory to cut and shape the first arc-shaped inner cavity.

[0051] S2.3, Arc-shaped inner cavity reversal cutting: After the first arc-shaped inner cavity is formed, gas is filled through the second pipe 49. Compressed air pushes the conduit 44 and air box 45 in each receiving cylinder 42 to move, so that each splicing cylinder 34 unfolds in sequence under the action of air pressure and the return torsion spring, and returns to the linear array arrangement along the axis of the drill bit body 31. The splicing cylinder 34 and the drill bit assembly 37 are pulled out from the first arc-shaped inner cavity. Then the feed slide moves forward again, and the gas is extracted again through the first pipe 48. Each splicing cylinder 34 is driven by air pressure to hinge and deflect in the second direction opposite to the first hinge direction in sequence, forming an arc structure that matches the second arc-shaped inner cavity. The drill bit assembly 37 is offset in the second direction, cutting and forming the second arc-shaped inner cavity. The operation is repeated in this way to form at least two arc-shaped inner cavities arranged in a ring array with the straight inner cavity as the center.

[0052] S3. Retraction: After the entire arc-shaped inner cavity is machined, the feed drive cylinder or servo feed motor drives the feed slide to move in the opposite direction. The drill bit body 31 and splicing cylinder 34 gradually retract and reset. During the retraction of the limiting cylinder 33, the splicing cylinder 34 is constrained by the inner wall of the limiting cylinder 33 and retracts and resets. The drill bit assembly 37 retracts into the limiting cylinder 33 along with the splicing cylinder 34, completing the drilling operation. The clamping mechanism is reset to the unloading position under the drive of the linear conveying mechanism. The gripper mechanism takes out the finished bolt with completed drilling from the clamping mechanism and transfers it to the unloading channel.

[0053] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A production equipment for hexagonal head reinforcing rod bolts, characterized in that, include: The main body of the production line (2) is provided with a clamping mechanism, which is used to clamp and fix the workpiece; The drilling mechanism (3) is arranged on the main body of the production line (2) and corresponds to the position of the clamping mechanism. The drilling mechanism (3) includes a linear feed assembly, a motor drive assembly, and a drill bit rod (31) connected to the output end of the motor drive assembly. A limiting sleeve (33) is fitted onto the outside of the drill bit rod body (31); A plurality of splicing cylinders (34) are sequentially hinged along the axial direction of the limiting cylinder (33) at the output end of the limiting cylinder (33). The opposing surfaces of two adjacent splicing cylinders (34) are provided with abutting surfaces. The abutting surfaces are used to abut against each other when the splicing cylinders (34) deflect to limit the rotation angle, so that the plurality of splicing cylinders (34) form an arc-shaped structure that adapts to the arc-shaped inner cavity. Adjustment component (4), which is located on the side surface of the splicing cylinder (34), is used to control the hinge deflection direction of several splicing cylinders (34) by pneumatic drive, so as to realize the switching of the drill bit group (37) located at the end of the splicing cylinder (34) between the straight state and the arc offset state.

2. The production equipment for a hexagonal head reinforcing rod bolt according to claim 1, characterized in that, The drilling mechanism (3) also includes a support frame (32), which is fixedly connected to the feed slide of the linear feed assembly. The support frame (32) is provided with an annular sleeve, and the surface of the annular sleeve is provided with several discharge holes. The limiting cylinder (33) is sleeved inside the support frame (32), and the drill bit rod (31) is rotatably sleeved inside the limiting cylinder (33).

3. The production equipment for a hexagonal head reinforcing rod bolt according to claim 2, characterized in that, Each of the splicing cylinders (34) is rotatably fitted with a chip removal ring (35), and a number of blades are arranged on the chip removal ring (35), forming a chip removal channel between two adjacent blades; two adjacent chip removal rings (35) are connected by a universal joint (36), and the drill bit assembly (37) is fixedly connected to the chip removal ring (35) at the end.

4. The production equipment for a hexagonal head reinforcing rod bolt according to claim 1, characterized in that, The adjustment component (4) includes two sets of modified atmosphere modules, which are symmetrically arranged on the side surfaces of several splicing cylinders (34) to adjust the rotation direction of several splicing cylinders (34) to deflect to both sides respectively.

5. The production equipment for a hexagonal head reinforcing rod bolt according to claim 4, characterized in that, The modified atmosphere module includes several fixed frames (41), receiving cylinders (42), conduits (44), air boxes (45), plugs (47), and a first spring (46); several fixed frames (41) are respectively fixedly connected to the side surface of the splicing cylinder (34), and the receiving cylinders (42) are fixedly connected to the side of the fixed frames (41); the conduits (44) are connected between two adjacent receiving cylinders (42), the air boxes (45) are sealed and slid inside the receiving cylinders (42), the plugs (47) are slidably sleeved inside the air boxes (45), and the first spring (46) is located inside the air boxes (45) and elastically adapted to the plugs (47).

6. The production equipment for a hexagonal head reinforcing rod bolt according to claim 5, characterized in that, The receiving cylinder (42) has a spherical interface at its output end, and a conical interface (43) is fixedly connected to the inner wall of the receiving cylinder (42). The surface of the conical interface (43) is provided with several air holes. The ball head of the conduit (44) is connected to the inside of the spherical interface, and the output end of the conduit (44) is fixedly connected to the air box (45). In two adjacent receiving cylinders (42), the conduit (44) on a portion of the receiving cylinder (42) is inserted into the inside of the other receiving cylinder (42), and the conical interface (43) on a portion of the receiving cylinder (42) is inserted into the inside of the air box (45) on the other receiving cylinder (42).

7. The production equipment for a hexagonal head reinforcing rod bolt according to claim 5, characterized in that, The receiving cylinder (42) near the drill bit assembly (37) is fixedly connected to a first pipe (48), and the receiving cylinder (42) away from the drill bit assembly (37) is fixedly connected to a second pipe (49). The first pipe (48) and the second pipe (49) are arranged within the wall thickness of the limiting cylinder (33). The first pipe (48) and the second pipe (49) are both metal corrugated pipe structures, which are used to bend and deform with the splicing cylinder (34) during its deflection and unfolding process.

8. The production equipment for a hexagonal head reinforcing rod bolt according to claim 1, characterized in that, The main body of the production line (2) is also provided with a linear conveying mechanism, a driving mechanism and a gripper mechanism; the gripping mechanism includes a fixed base, a gripping sleeve installed on the fixed base and an elastic chuck arranged in the gripping sleeve.

9. A hexagonal head reinforcing rod bolt, characterized in that, include: Bolt body (1), which includes an integrally formed hexagonal head, a smooth reinforcing shank, and an externally threaded shank; An elongated inner cavity (11) is formed at the axis of the bolt body (1). The elongated inner cavity (11) includes a straight inner cavity and at least two arc-shaped inner cavities arranged in a ring array with the straight inner cavity as the center. The input ends of the arc-shaped inner cavity are respectively arranged at the thread groove and thread crest of the external thread rod segment, which are used to scrape off dirt and store it inside the straight inner cavity when screwing into the component to be fastened, and to store liquid media and allow it to seep out during service.

10. A manufacturing process for a hexagonal head reinforcing rod bolt, characterized in that, Using the production equipment as described in any one of claims 1 to 8, the process includes the following steps: S1. Clamping and positioning: The bolt semi-finished product is placed into the clamping mechanism through the gripper mechanism, and the bolt semi-finished product is clamped and fixed by the clamping sleeve and elastic chuck, and then moved to the processing station; S2, Straight inner cavity cutting: The drill rod (31) is fed and rotated by the linear feed assembly and motor drive assembly of the drilling mechanism (3) to drill and form a straight inner cavity at the axis of the bolt body (1); S2.1, Arc-shaped inner cavity cutting: After the drill rod (31) is fed to the predetermined depth, the gas is extracted through the first pipe (48) of the adjustment component (4), so that several splicing cylinders (34) are hinged and deflected in the first direction under negative pressure to form an arc structure, which drives the drill assembly (37) to offset and cut to form the first arc-shaped inner cavity. S2.2, Arc-shaped inner cavity reversing cutting: By filling gas through the second pipe (49) of the adjusting component (4), several splicing cylinders (34) are unfolded, reset and extracted. Then, the gas is extracted again through the first pipe (48), causing several splicing cylinders (34) to hinge and deflect in the second direction opposite to the first direction, and the second arc-shaped inner cavity is cut and formed. S3, Retraction: After processing, the drill bit rod (31) and splicing cylinder (34) retract and reset, the clamping mechanism resets and unloads the material.

Images