Coaxial double-speed efficient heading device

Abstract

The invention provides a coaxial double-speed efficient heading device which comprises a machine base, and the machine base is provided with an even number of heading modules which are arranged in a radial mode. And the driving mechanism drives the head beating module to beat the head of the pipe rod in the beating area. The heading module comprises a knocking mechanism and a reducing mechanism. The driving mechanism comprises a first driving mechanism and a second driving mechanism, the first driving mechanism drives the knocking mechanism to rotate, and the second driving mechanism drives the reducing mechanism to reversely rotate relative to the knocking mechanism. The knocking mechanism is used for reducing the head of the pipe rod by knocking the reducing mechanism. The device can greatly shorten the single-time hole shrinkage action time, improve the heading efficiency, disperse single-time large-energy knocking into high-frequency small impact, reduce noise, reduce the deformation amplitude of the pipe and the bar in single-time knocking, prevent the pipe and the bar from being overpressed and cracked, and adapt to various materials difficult to deform.

Description

Technical Field

[0001] The invention belongs to the technical field of heading devices, and particularly relates to a coaxial two-speed high-efficiency heading device. Background Art

[0002] Heading devices are widely used in the processing of pipe and bar workpieces, especially in the special equipment before the drawing of pipe and bar workpieces. Its main function is to form a narrowed head at one end of the pipe or bar workpiece, the diameter of which is significantly smaller than the diameter of the pipe or bar workpiece body, so that the clamp of the cold drawing machine can perform drawing while clamping the pipe or bar workpiece. The traditional heading device drives the heading die to strike or press the pipe or bar workpiece through a motor or a hydraulic device. The number of strikes of the heading die is directly limited by the motor speed or the pressing speed of the hydraulic device, and it is difficult to improve the efficiency of the heading process. On the other hand, during the striking or pressing process, the running noise of the heading device is relatively large, which causes damage to the hearing of the operator and affects the overall working environment.

[0003] Therefore, the above problems need to be solved urgently. Summary of the Invention

[0004] Object of the Invention: In order to overcome the above deficiencies, the invention provides a coaxial two-speed high-efficiency heading device, which can improve the heading efficiency, reduce the working noise of the coaxial two-speed high-efficiency heading device, and protect the working environment.

[0005] Technical solution: To achieve the above object, the present invention provides a coaxial two-speed high-efficiency heading device, including a machine base, the machine base is provided with a plurality of heading modules arranged radially and in an even number. A driving mechanism, the driving mechanism drives the heading module to strike the head of the tube or rod in the hammering area. The heading module includes a knocking mechanism and a diameter-reducing mechanism. The driving mechanism includes a first driving mechanism and a second driving mechanism, the first driving mechanism drives the knocking mechanism to rotate, and the second driving mechanism drives the diameter-reducing mechanism to rotate reversely relative to the knocking mechanism. The knocking mechanism reduces the diameter of the head of the tube or rod by knocking the diameter-reducing mechanism. The present invention is used to strike the head of the tube or rod to reduce the diameter. During the diameter-reducing process, the tube or rod is placed in the hammering area, and the driving mechanism drives the heading module to strike and reduce the diameter of the head of the tube or rod in the hammering area. Specifically, the first driving mechanism drives the knocking mechanism to rotate, and the second driving mechanism drives the diameter-reducing mechanism to rotate reversely relative to the knocking mechanism. During the rotation process, the knocking mechanism knocks the diameter-reducing mechanism, so that the diameter-reducing mechanism reduces the diameter of the head of the tube or rod. During the knocking process, the rotation directions of the knocking mechanism and the diameter-reducing mechanism are opposite, which improves the hitting frequency of the tube or rod, can greatly shorten the single diameter-reducing action time, improves the heading efficiency, is suitable for mass production, and at the same time disperses a single large-energy knock into high-frequency small impacts, reduces the single impact intensity, reduces the noise peak and sound pressure level, reduces the vibration amplitude, reduces the wear of the device, and improves the service life of the device. At the same time, the coaxial two-speed high-efficiency heading device disperses a single large-energy knock into high-frequency small impacts, which can avoid local stress concentration, reduce the deformation of the tube or rod material, avoid overpressure cracking of the tube or rod material, adapt to a variety of difficult-to-deform materials, ensure that the shape of the shrunk tube is uniform and consistent, improve the aesthetics, indirectly reduce the motor power, and improve the energy-saving performance.

[0006] Further, in the above coaxial two-speed high-efficiency heading device, the diameter-reducing mechanism includes a pressure block holder, the pressure block holder is connected to the first driving mechanism, the pressure block holder is provided with a pressure block assembly, at least four pressure block assemblies are circumferentially and evenly arranged along the axis of the pressure block holder, the pressure block assembly is slidably connected to the chute of the pressure block holder, and the pressure block assembly slides towards the center of the pressure block holder to form a diameter-reducing channel. One end of the pressure block holder away from the first driving mechanism is connected with a pressure ring, and the pressure ring is slidably connected to the pressure block holder coaxially. One end of the pressure ring away from the pressure block holder is nested with an end cap, and a channel for the tube or rod part to extend into is provided in the center of the end cap. The setting of the pressure ring ensures that the pressure block assembly always slides in the chute provided in the pressure block holder, avoids the movement of the pressure block assembly, affects the surface quality of heading, and at the same time, at least four evenly arranged pressure block assemblies can ensure that the pressure is evenly distributed on the surface of the tube or rod during the tube shrinking process, avoids uneven pressure affecting the diameter-reducing effect, improves the stability and centering of the tube or rod part, avoids the deviation of the tube or rod, and improves the heading quality.

[0007] Further, in the above coaxial two-speed high-efficiency heading device, the knocking mechanism includes a roller cage. The roller cage is coaxially and rotatably connected to the outside of the pressure block cage. The roller cage is provided with cylindrical rollers, and the cylindrical rollers protrude from the inner side wall of the roller cage. The cylindrical rollers knock on the rotating pressure block assembly, so that the pressure block assembly reduces the diameter of the head of the tube or bar. A friction drive cage is sleeved outside the roller cage. The friction drive cage is frictionally driven and connected to the roller cage through friction plates provided on both sides of the roller cage. The machine base is connected with a bushing, and the friction drive cage and the bushing are axially movably connected. The number of cylindrical rollers is set to be a multiple of the pressure block assembly. The roller cage provided in the knocking mechanism is directly connected to the outside of the pressure block cage, with a simple structure, no need for complex shaft connection structures and intermediate connectors, reducing the structural complexity, reducing the equipment cost, reducing the failure rate, and having a high transmission efficiency. And the friction drive cage drives the roller cage to rotate through the friction plates, with a compact structure, high transmission stability, capable of providing overload protection, and improving the equipment reliability.

[0008] Further, in the above coaxial two-speed high-efficiency heading device, the first drive mechanism includes a main belt drive wheel and a first drive motor. The main belt drive wheel and the friction drive cage are coaxially and synchronously connected. The first drive motor is connected to the top of the machine base. The main shaft of the first drive motor is connected with a secondary belt drive wheel. The main belt drive wheel and the secondary belt drive wheel are driven and connected by a belt. The first drive motor drives the friction drive cage to rotate through the belt, and then drives the roller cage to rotate. The entire drive system has a simple structure, is easy to maintain, and can reduce the operating noise of the equipment at the same time.

[0009] Further, in the above coaxial two-speed high-efficiency heading device, the second drive mechanism includes a worm gear, a second drive motor, and a drive main shaft. The drive main shaft is axially movably connected to the machine base through bearings provided at both ends. The drive main shaft and the pressure block cage are coaxially driven and connected. The drive main shaft is coaxially connected to the center of the worm gear. A worm is axially movably connected to the machine base. The worm and the worm gear are meshed. One end of the worm protruding from the machine base is connected with a driven belt wheel. The second drive motor is connected to the lower end of the machine base. The main shaft of the second drive motor is connected with a drive belt wheel. The drive belt wheel and the driven belt wheel are driven and connected by a belt. The worm and the worm gear have a stable transmission, low noise, a large transmission ratio, can increase the rotational speed of the main shaft, improve the diameter reduction efficiency, and at the same time, the worm and the worm gear have a self-locking characteristic, which can prevent the main shaft from rotating in reverse and protect the safety of personnel and equipment.

[0010] Further, in the above coaxial two-speed high-efficiency heading device, the pressing block assembly includes: forming blocks, cushion blocks, and knocking blocks radially arranged along the center of the pressing block holder. An arc-shaped convex portion is provided on the outer side of the knocking block. Each forming block is provided with a tapered groove. When the forming blocks are assembled at the center of the pressing block holder, the tapered grooves form a tapered hole. An arc groove is integrally provided near the driving main shaft on the forming block. When the forming blocks are assembled at the center of the pressing block holder, the arc grooves form a circular hole. The tapered groove provided on the forming block knocks the tube bar, guiding the tube bar to the center of the hammering area, gradually pressing the tube bar, and gradually reducing its diameter, avoiding stress concentration caused by sudden diameter changes and reducing the springback amount. The arc groove forms a circular hole, enabling the tube bar to transition from the taper formed by knocking with the tapered groove to straightness, achieving diameter reduction.

[0011] Further, in the above coaxial two-speed high-efficiency heading device, the tapered groove is provided with a plurality of biting grooves, which are arranged in an array along the axis of the tapered hole. Each biting groove is composed of a vertical surface and an inclined surface. The vertical surface is perpendicular to the axis of the tapered hole, the inclined surface is arranged at an angle with the axis of the tapered hole, and the vertical surface is provided on the side of the tapered groove away from the driving main shaft. During the process of the forming block hitting the tube bar, the diameter of the tube bar becomes smaller due to the extrusion of the tapered groove. Since the diameter of the biting groove is larger than that of the tapered groove, part of the material of the tube bar flows into the biting groove, biting the tube bar, preventing the tube bar from retracting, guiding the tube bar part to move along the predetermined direction, avoiding the deviation or skew of the tube bar, and improving the diameter reduction efficiency and quality.

[0012] Further, in the above coaxial two-speed high-efficiency heading device, a through hole is provided along the axis of the driving main shaft. A blanking detection mechanism is connected inside the through hole. The blanking detection mechanism includes a hollow sleeve coaxially connected inside the through hole. A countersunk through hole is provided at one end of the sleeve close to the diameter reduction mechanism. A thimble is connected inside the countersunk through hole. The thimble includes a head and a neck. The head is arranged at the end close to the diameter reduction mechanism, and the neck passes through the countersunk through hole provided on the sleeve. A spring is provided at the countersunk part of the countersunk through hole, and the spring is sleeved outside the neck and abuts against the head. A nut is connected to the end of the neck away from the head. When the tube bar pushes the thimble, the spring outside the neck is compressed, and the spring pushes the head to retract. When the diameter reduction of the tube bar is completed, the spring restores and releases elastic force to push the tube bar part out, improving the diameter reduction efficiency.

[0013] Furthermore, in the above coaxial two-speed high-efficiency heading device, an overrunning clutch is connected to one end of the driving main shaft away from the heading module. The overrunning clutch includes a star wheel and an outer ring sleeved outside the star wheel. The outer ring is connected to the side wall of the machine base, and the star wheel is coaxially connected to the driving main shaft. A number of inclined grooves are provided at intervals on the outside of the star wheel. The inclined grooves and the outer ring form a number of raceways, and rollers are respectively arranged in the raceways. The rollers are kept connected in the raceways through elastic members. The outer ring is connected with a rear end cover. The bottom of the inclined groove is a double arc surface with different radii. The overrunning clutch includes an initial state, an engaged state, and a disengaged state. In the initial state, the elastic member applies an elastic force to the roller, so that the roller contacts the intersection position of the double arc surface at the bottom of the inclined groove. In the disengaged state, when the main shaft provides power clockwise to drive the star wheel to rotate, the roller is affected by the frictional forces of the star wheel and the outer ring, and the roller rolls to the arc surface on the side of the bottom of the inclined groove close to the elastic member, and the star wheel and the outer ring are disengaged. In the engaged state, when the star wheel rotates in the reverse direction, the roller is affected by the frictional forces of the star wheel and the outer ring and rolls towards the arc surface on the side of the bottom of the inclined groove away from the elastic member. The roller is squeezed by the star wheel and the outer ring, transmits torque, brakes the star wheel, avoids the reverse rotation of the main shaft, and ensures the stability and safety of the production process.

[0014] Furthermore, in the above coaxial two-speed high-efficiency heading device, the rotational speed of the diameter-reducing mechanism is set to -rpm, and the rotational speed of the knocking mechanism is set to 0 - 0 rpm. The rotational speed of the diameter-reducing mechanism needs to be within the -rpm range so that the pressing block assembly can receive a strong enough centrifugal force to perform centrifugal motion and collide with the cylindrical rollers provided in the knocking mechanism. The pressing block assembly moves towards the hammering area after being impacted, strikes the pipe or rod in the hammering area, and under the combined action of the reaction force and centrifugal force of the pipe or rod, the pressing block assembly moves outward and collides with the cylindrical rollers again, and so on in sequence. Setting the rotational speed of the knocking mechanism to.-. times that of the diameter-reducing mechanism can increase the knocking frequency, reduce the single-impact intensity, reduce the noise peak and sound pressure level, reduce the deformation amplitude of the pipe or rod under single force, avoid overpressure cracking of the pipe or rod, be able to adapt to various difficult-to-deform materials, and improve the quality of pipe shrinking.

[0015] As can be seen from the above technical solutions, the present invention has the following beneficial effects: The coaxial two-speed high-efficiency heading device of the present invention has the knocking mechanism and the necking mechanism rotating in opposite directions, which improves the hitting frequency of the tube or rod, can greatly shorten the single necking action time, improves the heading efficiency, is suitable for mass production, disperses the single large-energy knocking into high-frequency small impacts, reduces the single impact intensity, reduces the noise peak value and sound pressure level, reduces the vibration amplitude, reduces the wear of the device, and improves the service life of the device. At the same time, the coaxial two-speed high-efficiency heading device disperses the single large-energy knocking into high-frequency small impacts, which can avoid local stress concentration, reduce the deformation of the tube or rod, avoid overpressure cracking of the tube or rod, adapt to a variety of difficult-to-deform materials, ensure the uniform shape of the necked tube, improve the aesthetics, indirectly reduce the motor power, and improve the energy saving. The at least four evenly distributed pressure block assemblies can ensure that the pressure is evenly distributed on the surface of the tube or rod during the necking process, avoid the influence of uneven pressure on the necking effect, improve the stability and centering of the tube or rod parts, avoid the deviation of the tube or rod, and improve the heading quality. The roller cage provided in the knocking mechanism is directly connected to the outside of the pressure block cage, with a simple structure, no need for complex shaft socket structures and intermediate connectors, reducing the structural complexity, reducing the equipment cost, reducing the failure rate, and having a high transmission efficiency. And the friction drive frame drives the roller cage to rotate through friction plates, with a compact structure, high transmission stability, capable of providing overload protection, and improving the equipment reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the coaxial two-speed high-efficiency heading device of the present invention; Figure 2 is a cross-sectional view of the coaxial two-speed high-efficiency heading device of the present invention; Figure 3 is an exploded view of the heading module; Figure 4 is Figure 3 a partial enlarged view of; Figure 5 is a schematic structural diagram of the forming block; Figure 6 is Figure 1 a partial enlarged view of; Figure 7 is Figure 6 a partial enlarged view of; Figure 8 is an internal schematic diagram of the overrunning clutch.

[0017] In the figure: 1. Machine base; 2. Head-forming module; 21. Knocking mechanism; 211. Roller cage; 212. Cylindrical roller; 213. Friction drive frame; 22. Diameter-reducing mechanism; 221. Pressure block cage; 222. Pressure block assembly; 2221. Forming block; 2222. Spacer block; 2223. Knocking block; 2224. Tapered groove; 22241. Biting groove; 2225. Arc groove; 223. Pressure ring; 224. End cover; 31. First drive mechanism; 311. Main belt drive pulley; 312. First drive motor; 313. Auxiliary belt drive pulley; 32. Second drive mechanism; 321. Worm gear; 322. Second drive motor; 323. Drive main shaft; 324. Worm; 3241. Hollow sleeve; 3242. Thimble; 32421. Head; 32422. Neck; 4. Overrunning clutch; 41. Star wheel; 42. Outer ring; 411. Tapered groove; 43. Roller; 44. Elastic member; 45. Rear end cover. Detailed implementation manner

[0018] Embodiment 1 As Figure 1-2 A coaxial two-speed high-efficiency head-forming device as shown, including a machine base 1, and the machine base 1 is provided with a radially arranged and even-numbered head-forming module 2. A drive mechanism drives the head-forming module 2 to knock the head of the tube or rod in the hammering area. The head-forming module 2 includes a knocking mechanism 21 and a diameter-reducing mechanism 22. The drive mechanism includes a first drive mechanism 31 and a second drive mechanism 32. The first drive mechanism 31 drives the knocking mechanism 21 to rotate, and the second drive mechanism 32 drives the diameter-reducing mechanism 22 to rotate reversely relative to the knocking mechanism 21. The knocking mechanism 21 reduces the diameter of the head of the tube or rod by knocking the diameter-reducing mechanism 22.

[0019] In this embodiment, the first drive mechanism 31 includes a main belt drive pulley 311 and a first drive motor 312. The main belt drive pulley 311 and the friction drive frame 223 are coaxially and synchronously connected. The first drive motor 312 is connected to the top of the machine base 1. The main shaft of the first drive motor 312 is connected with an auxiliary belt drive pulley 313. The main belt drive pulley 311 and the auxiliary belt drive pulley 313 are connected by belt drive.

[0020] In this embodiment, the second driving mechanism 32 includes a worm gear 321, a second driving motor 322, and a driving main shaft 323. The driving main shaft 323 is movably connected to the machine base 1 through bearings provided at both ends. The driving main shaft 323 is coaxially and drivingly connected to the pressing block holder 221. The driving main shaft 323 is coaxially connected to the center of the worm gear 321. A worm 324 is movably connected to the machine base 1. The worm 324 and the worm gear 321 are meshed. One end of the worm 324 extending out of the machine base 1 is connected with a driven pulley. The second driving motor 322 is connected to the lower end of the machine base 1. The main shaft of the second driving motor 322 is connected with a driving pulley. The driving pulley and the driven pulley are drivingly connected by a belt. The worm and the worm gear have stable transmission, low noise, and a large transmission ratio, which can increase the rotation speed of the main shaft and improve the necking efficiency. At the same time, the worm and the worm gear have a self-locking characteristic, which can prevent the main shaft from rotating in reverse and protect the safety of personnel and equipment.

[0021] As Figure 3 shown in the coaxial two-speed high-efficiency heading device, the necking mechanism 22 includes a pressing block holder 221. The pressing block holder 221 is connected to the first driving mechanism 31. The pressing block holder 221 is provided with a pressing block assembly 222. At least four pressing block assemblies 222 are circumferentially and uniformly arranged along the axis of the pressing block holder 221. The pressing block assemblies 222 are slidably connected in the sliding grooves of the pressing block holder 221. The pressing block assemblies 222 slide towards the center of the pressing block holder 221 and are assembled to form a necking channel. One end of the pressing block holder 221 away from the first driving mechanism 31 is connected with a pressing ring 223. The pressing ring 223 is coaxially and slidably connected to the pressing block holder 221. A end cover 224 is nested at one end of the pressing ring 223 away from the pressing block holder 221. A channel for the pipe or rod to extend into is provided at the center of the end cover 224. The setting of the pressing ring 223 ensures that the pressing block assemblies 222 always slide in the sliding grooves provided in the pressing block holder 221, avoiding the movement of the pressing block assemblies 222 and affecting the heading surface quality. At the same time, at least four pressing block assemblies 222 arranged uniformly can ensure that the pressure is evenly distributed on the surface of the pipe or rod during the pipe shrinking process, avoiding the influence of uneven pressure on the necking effect, improving the stability and centering of the pipe or rod, avoiding the deviation of the pipe or rod, and improving the heading quality.

[0022] In this embodiment, the knocking mechanism 21 includes a roller cage 211. The roller cage 211 is coaxially and rotatably connected to the outside of the pressure block cage 221. The roller cage 211 is provided with cylindrical rollers 212, and the cylindrical rollers 212 protrude from the inner side wall of the roller cage 211. The cylindrical rollers 212 knock on the rotating pressure block assembly 222, so that the pressure block assembly 222 reduces the diameter of the head of the tube or bar. A friction drive frame 213 is sleeved on the outside of the roller cage 211. The friction drive frame 213 is frictionally driven and connected to the roller cage 211 through friction plates provided on both sides of the roller cage 211. The machine base 1 is connected with a bushing 214, and the friction drive frame 223 is axially movably connected to the bushing 214. The number of the cylindrical rollers 212 is set to be a multiple of the pressure block assembly 222. The roller cage 211 provided in the knocking mechanism 21 is directly connected to the outside of the pressure block cage 221, with a simple structure, without a complex shaft connection structure and intermediate connectors, reducing the structural complexity, reducing the equipment cost, reducing the failure rate, and having a high transmission efficiency. And the friction drive frame 223 drives the roller cage 211 to rotate through the friction plate, with a compact structure, high transmission stability, capable of providing overload protection, and improving the equipment reliability.

[0023] As Figure 4-5 shown in the coaxial two-speed high-efficiency heading device, the pressure block assembly 222 includes: forming blocks 2221, spacer blocks 2222 and knocking blocks 2223 radially arranged along the center of the pressure block cage 221. An arc-shaped convex part is provided on the outside of the knocking block 2223. Each forming block 2221 is provided with a tapered groove 2224. When the forming blocks 2221 are assembled at the center of the pressure block cage 221, the tapered grooves 2224 form a tapered hole. An arc groove 2225 is integrally provided near the driving main shaft 323 on the tapered groove 2224. When the forming blocks 2221 are assembled at the center of the pressure block cage 221, the arc grooves 2225 form a round hole. The tapered grooves 2224 provided on the forming blocks 2221 knock on the tube or bar, guiding the tube or bar to be at the center of the hammering area, so that the tube or bar is gradually compressed and the diameter gradually becomes smaller, avoiding stress concentration caused by sudden diameter change and reducing the springback amount. The arc grooves form a round hole, enabling the tube or bar to change from the taper formed by the knocking of the tapered groove 2224 to straightness, realizing diameter reduction.

[0024] In this embodiment, the tapered groove 2224 is provided with a plurality of biting grooves 22241, and the biting grooves 22241 are arranged in an array along the axis of the tapered hole. The biting groove 22241 is composed of a vertical surface and an inclined surface. The vertical surface is perpendicular to the axis of the tapered hole, the inclined surface is arranged at an angle with the axis of the tapered hole, and the vertical surface is arranged on the side of the tapered groove 2224 away from the driving main shaft 323. During the process of the forming block 2221 hitting the tube or bar, the tube or bar is extruded by the tapered groove 2224 and the diameter becomes smaller. Since the diameter of the biting groove 22241 is larger than that of the tapered groove 2224, part of the material of the tube or bar flows into the biting groove 22241, biting on the tube or bar, avoiding the backward movement of the tube or bar, guiding the tube or bar part to move along the predetermined direction, avoiding the deviation or skew of the tube or bar, and improving the diameter reduction efficiency and quality.

[0025] As shown in Figure 6-7 the coaxial two-speed high-efficiency heading device, a through hole is provided along the axis of the driving main shaft 323. A blanking detection mechanism is connected inside the through hole. The blanking detection mechanism includes a hollow sleeve 3241 coaxially connected inside the through hole. A counterbore through hole is provided at one end of the sleeve 3241 close to the necking mechanism 22. A thimble 3242 is connected inside the counterbore through hole. The thimble 3242 includes a head 32421 and a neck 32422. The head 32421 is arranged at one end close to the necking mechanism 22. The neck 32422 passes through the counterbore through hole provided in the sleeve 3241. A spring is provided at the counterbore part of the counterbore through hole. The spring is sleeved outside the neck 222 and abuts against the head 32421. A nut is connected to the end of the neck 222 away from the head 221. When the pipe or rod pushes the thimble, the spring outside the neck 222 is compressed, and the spring pushes the head back. When the pipe or rod necking is completed, the spring restores and releases elastic force to push out the pipe or rod part, improving the necking efficiency.

[0026] The present invention is used to realize necking by knocking the head of a pipe or rod. During the necking process, the pipe or rod is placed in the hammering area. The driving mechanism drives the heading module 2 to knock and neck the head of the pipe or rod in the hammering area. Specifically, the first driving motor 312 drives the friction driving frame 223 to rotate through a belt, and then drives the roller cage 211 to rotate, and further drives the cylindrical roller 212 to rotate around the necking mechanism 22. At the same time, the second driving motor 322 drives the worm 324 to drive the worm gear 321 to rotate. The driving main shaft 323 connected to the worm gear 321 drives the pressure block cage 221 to rotate, and the rotation direction is opposite to the rotation direction of the cylindrical roller 212. The pressure block assembly 222 connected to the pressure block cage 221 moves outward under the action of centrifugal force due to rotation, and collides with the cylindrical roller 212. The cylindrical roller 212 knocks the forming block 2221, and the forming block 2221 moves in the reverse direction and hits the pipe or rod in the hammering area. The pressure block assembly 222 is jointly affected by the reaction force of the pipe or rod and the centrifugal force, moves outward, and collides with the cylindrical roller 212 again, and so on in sequence to neck the head of the pipe or rod.

[0027] Embodiment 2 The difference between this embodiment and Embodiment 1 is that, as shown in Figure 8The coaxial two-speed high-efficiency heading device shown has an overrunning clutch 4 connected to one end of the driving main shaft 323 away from the heading module 2. The overrunning clutch 4 includes a star wheel 41 and an outer ring 42 sleeved outside the star wheel 41. The outer ring 42 is connected to the side wall of the machine base 1, and the star wheel 41 is coaxially connected to the driving main shaft 323. A number of inclined grooves 411 are provided at intervals outside the star wheel 41. The inclined grooves 411 and the outer ring 42 form a number of raceways, and roller 43 are respectively provided in the raceways. The roller 43 is kept connected in the raceway by an elastic member 44. The outer ring 42 is connected with a rear end cover 45. The bottom of the inclined groove 411 is a double arc surface with different radii. The overrunning clutch includes an initial state, an engaged state, and a disengaged state. In the initial state, the elastic member applies an elastic force to the roller so that the roller contacts the intersection position of the double arc surface at the bottom of the inclined groove. In the disengaged state, when the main shaft provides power clockwise to drive the star wheel to rotate, the roller is subjected to the frictional forces of the star wheel and the outer ring, and the roller rolls to the arc surface on the side of the inclined groove bottom close to the elastic member, and the star wheel and the outer ring are disengaged. In the engaged state, when the star wheel rotates in the reverse direction, the roller is subjected to the frictional forces of the star wheel and the outer ring and rolls towards the arc surface on the side of the inclined groove bottom away from the elastic member. The roller is squeezed by the star wheel and the outer ring to transmit torque and brake the star wheel to prevent the main shaft from reversing, ensuring the stability and safety of the production process.

[0028] Embodiment 3 The difference between this embodiment and Embodiment 1 is that the rotation speed of the reducing mechanism 22 is set to 25 - 35 rpm, and the rotation speed of the knocking mechanism 21 is set to 160 - 220 rpm. The rotation speed of the reducing mechanism 22 needs to be within the range of 25 - 35 rpm so that the pressing block assembly 222 can receive a strong enough centrifugal force to perform centrifugal motion and collide with the cylindrical roller 212 provided in the knocking mechanism 21. The pressing block assembly 222 moves towards the hammering area after being impacted, strikes the pipe or rod in the hammering area. The pressing block assembly 222 moves outward under the combined action of the reaction force and centrifugal force of the pipe or rod, and collides with the cylindrical roller 212 again, and so on in sequence. Setting the rotation speed of the knocking mechanism 21 to 5.5 - 6.5 times that of the reducing mechanism 22 can increase the knocking frequency, reduce the single impact intensity, reduce the noise peak value and sound pressure level, reduce the deformation amplitude of the pipe or rod under single force, avoid overpressure cracking of the pipe or rod, be able to adapt to a variety of difficult-to-deform materials, and improve the quality of pipe shrinking.

[0029] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and characteristics of the present invention so that those skilled in this field can understand the content of the present invention and implement it accordingly, and the protection scope of the present invention cannot be limited thereby. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A coaxial two-speed high-efficiency heading device, characterized in that: It includes a machine base (1), and the machine base (1) is provided with radially arranged and even number of heading modules (2). A driving mechanism that drives the heading module (2) to strike the head of the pipe or rod in the hammering area; the heading module (2) includes a knocking mechanism (21) and a diameter reduction mechanism (22); the driving mechanism includes a first driving mechanism (31) and a second driving mechanism (32), the first driving mechanism (31) drives the knocking mechanism (21) to rotate, and the second driving mechanism (32) drives the diameter reduction mechanism (22) to rotate reversely relative to the knocking mechanism (21); the knocking mechanism (21) reduces the diameter of the head of the pipe or rod by knocking the diameter reduction mechanism (22).

2. The coaxial two-speed high-efficiency heading device according to claim 1, characterized in that: The diameter reduction mechanism (22) includes a pressure block holder (221), the pressure block holder (221) is connected to the first driving mechanism (31), the pressure block holder (221) is provided with a pressure block assembly (222), at least four pressure block assemblies (222) are circumferentially and evenly distributed along the axis of the pressure block holder (221), the pressure block assembly (222) is slidably connected to the chute of the pressure block holder (221), and the pressure block assemblies (222) slide towards the center of the pressure block holder (221) to form a diameter reduction channel; one end of the pressure block holder (221) far from the first driving mechanism (31) is connected with a pressure ring (223), and the pressure ring (223) is slidably connected to the pressure block holder (221) coaxially; one end of the pressure ring (223) far from the pressure block holder (221) is nested with an end cover (224), and a channel for the pipe or rod part to extend into is provided in the center of the end cover (224).

3. The coaxial two-speed high-efficiency heading device according to claim 2, wherein: The knocking mechanism (21) includes a roller holder (211), the roller holder (211) is coaxially and rotatably connected to the outside of the pressure block holder (221), the roller holder (211) is provided with cylindrical rollers (212), and the cylindrical rollers (212) protrude from the inner side wall of the roller holder (211); the cylindrical rollers (212) knock the rotating pressure block assembly (222) to reduce the diameter of the head of the pipe or rod by the pressure block assembly (222); a friction drive frame (213) is sleeved outside the roller holder (211), the friction drive frame (213) is frictionally driven and connected to the roller holder (211) through friction plates provided on both sides of the roller holder (211), and the machine base (1) is connected with a bushing (214), and the friction drive frame (223) is axially movably connected to the bushing (214).

4. The coaxial two-speed high-efficiency heading device according to claim 3, characterized in that: The first driving mechanism (31) includes a main belt driving wheel (311) and a first driving motor (312), the main belt driving wheel (311) is coaxially and synchronously connected to the friction drive frame (223), the first driving motor (312) is connected to the top of the machine base (1), the main shaft of the first driving motor (312) is connected with a secondary belt driving wheel (313), and the main belt driving wheel (311) and the secondary belt driving wheel (313) are driven and connected by a belt.

5. The coaxial two-speed high-efficiency heading device according to claim 2, characterized in that: The second driving mechanism (32) includes a worm gear (321), a second driving motor (322), and a driving main shaft (323); the driving main shaft (323) is movably connected to the machine base (1) through bearings provided at both ends; the driving main shaft (323) is coaxially drivingly connected to the pressing block holder (221), the driving main shaft (323) is coaxially connected to the center of the worm gear (321), a worm (324) is movably connected to the machine base (1) in an axial manner, the worm (324) and the worm gear (321) are meshed, one end of the worm (324) extending out of the machine base (1) is connected with a driven pulley, the second driving motor (322) is connected to the lower end of the machine base (1), the main shaft of the second driving motor (322) is connected with a driving pulley, and the driving pulley and the driven pulley are drivingly connected through a belt.

6. The coaxial two-speed high-efficiency heading device according to claim 1, wherein: The pressing block assembly (222) includes: forming blocks (2221), cushion blocks (2222), and knocking blocks (2223) radially arranged along the center of the pressing block holder (221); an arc-shaped convex part is provided on the outer side of the knocking block (2223); a tapered groove (2224) is provided on each of the forming blocks (2221); when the forming blocks (2221) are assembled at the center of the pressing block holder (221), the tapered grooves (2224) form a tapered hole; an arc groove (2225) is integrally provided on the tapered groove (2224) close to the driving main shaft (323), and when the forming blocks (2221) are assembled at the center of the pressing block holder (221), the arc grooves (2225) form a circular hole.

7. The coaxial two-speed high-efficiency heading device according to claim 6, characterized in that: The tapered groove (2224) is provided with a plurality of biting grooves (22241), and the biting grooves (22241) are arranged in an array along the axis of the tapered hole; each biting groove (22241) is composed of a vertical surface and an inclined surface; the vertical surface is perpendicular to the axis of the tapered hole, the inclined surface is arranged at an angle with the axis of the tapered hole, and the vertical surface is arranged on the side of the tapered groove (2224) away from the driving main shaft (323).

8. The coaxial two-speed high-efficiency heading device according to claim 1, characterized in that: A through hole is provided along the axis of the driving main shaft (323); a blanking detection mechanism is connected in the through hole, and the blanking detection mechanism includes a hollow sleeve (3241) coaxially connected in the through hole, a countersunk through hole is provided at one end of the sleeve (3241) close to the reducing mechanism (22), a thimble (3242) is connected in the countersunk through hole, the thimble (3242) includes a head (32421) and a neck (32422), the head (32421) is arranged at one end close to the reducing mechanism (22), the neck (32422) passes through the countersunk through hole provided in the sleeve (3241), a spring is provided at the countersunk part of the countersunk through hole, the spring is sleeved outside the neck (222), and the spring abuts against the head (32421); a nut is connected to the end of the neck (222) away from the head (221).

9. The coaxial two-speed high-efficiency heading device according to claim 5, characterized in that: One end of the driving main shaft (323) away from the heading module (2) is connected with an overrunning clutch (4); the overrunning clutch (4) includes a star wheel (41) and an outer ring (42) sleeved outside the star wheel (41); the outer ring (42) is connected to the side wall of the machine base (1), and the star wheel (41) is coaxially connected to the driving main shaft (323); a plurality of inclined grooves (411) are arranged at intervals outside the star wheel (41), and the inclined grooves (411) and the outer ring (42) form a plurality of raceways, and rollers (43) are respectively arranged in the raceways, and the rollers (43) are kept connected in the raceways through elastic members (44); the outer ring (42) is connected with a rear end cover (45).

10. The coaxial two-speed high-efficiency heading device according to claim 1, characterized in that: The rotational speed of the diameter reducing mechanism (22) is set to 25 - 35 rpm, and the rotational speed of the knocking mechanism (21) is set to 160 - 220 rpm.

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