A pipe bending device and a pipe bending method with radial loading, rotation and centering positioning

Abstract

The present invention discloses a pipe bending device and a pipe bending method with radial loading, rotation and centering positioning. The pipe bending device comprises a bending machine and a radial rotation device. The bending machine comprises a frame, a bending device and a centering device. A centering device is respectively provided on baffles on both sides of the frame. A feeding mechanism is provided above the centering device. More than one bending device is provided on the frame between the two baffles and at the mounting groove. A radial rotation device is provided on the platform located at the mounting groove. The structure adopts a radial loading method to clamp the workpiece and realize the rotation of the workpiece so as to perform bending processing on the workpiece in different plane directions. The centering device performs precise centering positioning on the workpiece to facilitate determination of the processing origin. All devices and baffles located on the mounting groove can be moved along the mounting groove so as to perform pipe bending at different positions. Bending processing at different positions and different bending planes can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of pipe bending devices, and in particular to a pipe bending device and a pipe bending method capable of radial loading, rotation and centering positioning. Background Art

[0002] The electric heating tube needs to be bent into complex multi-plane and angle shapes, which can usually only be processed using traditional simple molds. It can only be completed by manually bending and correcting the tube material many times.

[0003] It is difficult to guarantee the processing accuracy by using simple mold bending. Some parts need to be designed and manufactured with special molds to complete the processing. For the cases with different bending planes and multiple bending points, the bending plane needs to be adjusted manually in the bending process, as well as the bending reference. Since it is impossible to achieve accurate standardization, the workpiece processing reference and the rebound after processing cannot be guaranteed. The product needs to be corrected many times, which is difficult to correct. The production efficiency is low and the product quality cannot be guaranteed.

[0004] In the patent document with Chinese patent application number 201810486167.1 and publication date 2018.09.18, an automatic bending device for electric heating pipes is proposed, including a storage box, a lifting mounting seat, a lifting mechanism, a feeding mechanism, a supporting frame, a bending mechanism and a driving unloading mechanism. A storage platform is provided in the storage box, a lifting mounting seat is provided on the side where the low end of the storage platform is located, a lifting mechanism is installed in the lifting mounting seat, a lifting frame is provided on the lifting mechanism, a feeding bracket is provided on the feeding mechanism, the feeding bracket cooperates with the fixed bracket, a walking groove is provided on the workbench, a driving disk is provided on the bending mechanism, a first bending driving roller and a second bending driving roller are installed below the driving disk, a unloading driving seat is provided on the driving unloading mechanism, a fixed clamping block and a movable clamping block are installed on the unloading driving seat, and a single feeding of the material in the storage box can be realized through the lifting mechanism, and the bending mechanism can realize automatic unloading operation after bending the electric heating pipe, thereby improving production efficiency.

[0005] However, if the invention needs to bend the bent tube in different planes, it needs to be completed by multiple sets of equipment. In this way, since the bent tubes in different processes need to be shifted and repositioned, the efficiency and accuracy of the bending will be relatively reduced. Summary of the invention

[0006] The object of the present invention is to provide a pipe bending device and a pipe bending method with radial loading rotation and centering positioning. By using the device and method of the present invention, one-time clamping can be achieved, and multi-plane and multi-position pipe bending can be achieved with high pipe bending accuracy and high pipe bending efficiency.

[0007] To achieve the above-mentioned purpose, the present invention provides a radially loaded, rotated and centering pipe bending device, including a bending machine and a radial rotating device, the bending machine including a frame, a bending device, a centering device and a clamping and fixing device, the frame including a frame body and a platform installed on the frame body, a mounting groove is provided on the platform along the length direction, baffles are provided on both sides of the platform, and a centering device is provided on each of the baffles on the two sides, the centering device is connected to the baffle through a connecting limit seat, a guide hole is provided on the connecting limit seat, and the centering function is realized by synchronously driving the stepper motors of the centering devices on both sides, a feeding mechanism is provided above the centering device, at least one bending device is provided on the frame between the two baffles and at the mounting groove, a radial rotating device is provided on the platform located at the mounting groove, the radial rotating device includes a clamping seat, a clamping module and a rotating module, a clamping and fixing device is provided on the platform located at the mounting groove, all devices and baffles located on the mounting groove can be moved along the mounting groove and fixed at different positions of the mounting groove.

[0008] The above-mentioned pipe bending method of a radially loaded rotation and centering positioning pipe bending device comprises the following steps:

[0009] a) According to the shape of the tube to be bent, adjust and move the device on the bending machine, and fix it after adjustment;

[0010] b) Store the pipe in the feeding mechanism, start the bending machine, and push the pipe to the centering device through the pushing mechanism;

[0011] c) The centering device detects the pipe material, and the stepper motors on both sides are driven synchronously to perform the centering operation;

[0012] d) After the alignment is completed, the clamping device is started to clamp the pipe material so that the pipe material does not move;

[0013] e) The bending device is started and a bending operation is completed;

[0014] f) After the radial rotary device detects that the bending is complete, the clamping module is started to clamp the pipe;

[0015] g) After clamping the pipe, start the rotary module to make the pipe rotate radially;

[0016] h) After the rotation is completed, the bending device performs the bending operation again;

[0017] i) During the bending process, the radial rotating device can be moved up and down by the cylinder control, so as to avoid the pipe material and ensure that the bending process will not be hindered;

[0018] j) After bending, the radial rotating device rotates back to its original position, the bending machine finishes working, and waits for the tube to be taken out for the next bending.

[0019] The above-mentioned structure is a radially loaded rotation and centering positioning pipe bending device, which adopts radial loading to clamp the workpiece and realize the rotation of the workpiece so as to perform bending processing on the workpiece along different bending planes. The centering device accurately centers and positions the workpiece to facilitate determination of the processing origin. The centering devices on both sides are synchronously driven to accurately adjust the centering position, and the workpiece is clamped by a clamping and fixing device to keep the processing origin unchanged. All devices and baffles located on the mounting groove can be moved along the mounting groove and fixed at different positions of the mounting groove so as to perform pipe bending at different positions, thereby bending into different shapes.

[0020] Furthermore, at least one feeding mechanism is provided on each of the baffles on both sides of the bending machine, and the feeding mechanism includes a limit module and a guide trough, the guide trough is formed by a square short pressure plate and a support plate installed on the baffle, the long end of the support plate is longer than the square short pressure plate, the end of the guide trough is connected to the limit module, the lower end of the support plate is connected to the limit block of the limit module, the limit module is composed of a limit block and a pushing mechanism, a groove is provided at the connection between the limit block and the guide trough, the limit block is located in front of the groove, and the upper end is a convex arc surface, the limit block is provided with a stopper in front of the feeding direction, and a feeding trough is formed between the stopper and the limit block. Thus, the pipe material to be processed can be stored and loaded through the guide trough of the feeding mechanism, and the pipe material will not slide down due to inertial pushing when entering the guide trough.

[0021] Furthermore, the pushing mechanism is connected and installed on the limit block, and the pushing mechanism includes a pushing cylinder, a pushing upper seat and a pushing block. The pushing cylinder is installed on the pushing upper seat, and the pushing upper seat is installed on the baffle. The pushing upper seat is located above the pushing cylinder, and a slide groove is provided on the pushing upper seat. A pushing block is slidably provided in the slide groove. The piston rod of the pushing cylinder is connected to the pushing block. The pushing cylinder can drive the pushing block to move up and down along the slide groove. The top of the pushing block presents a slope inclined downward along the feeding direction. The pushing mechanism is arranged below the groove, and the top of the pushing mechanism is lower than the groove of the limit block. Therefore, during the bending process, when the pushing mechanism pushes the pipe material, the design of the inclined surface of the pushing block can separate two adjacent pipe materials, thereby ensuring that only one pipe material is pushed each time.

[0022] Furthermore, the centering device includes a stepper motor, a screw rod and a centering slider. The stepper motor is installed on the baffle through a connecting limit seat, the screw rod is connected to the stepper motor, the centering slider is slidably inserted in the guide hole, the centering slider is threadedly connected to the screw rod, and the centering slider is arranged on the lower outside of the feed trough, and the top of the centering slider is lower than the feed trough. Therefore, when the stepper motor is working, the stepper motor drives the screw rod to rotate, and the screw rod drives the centering slider to move linearly along the guide hole to perform centering positioning work.

[0023] Furthermore, the bending device is fixedly mounted on the platform by screws, and the bending device includes a bending seat, a bending drive mechanism and a bending mechanism. The bending seat is fixed on the platform by screws, and the bending drive mechanism includes a bending tube drive cylinder, a rack, a gear and a rotating shaft. The bending tube drive cylinder is mounted on the bending seat, and the rack is laterally slidably arranged on the bending seat, and the output shaft of the bending tube drive cylinder is connected to the rack; the rotating shaft is axially and vertically mounted on the bending seat through a bearing; the gear is mounted on the rotating shaft, and the rack is meshed with the gear. The bending mechanism includes a swing arm, a fixed shaft and a bending wheel; one end of the swing arm is mounted on the rotating shaft, and the rotating shaft protrudes upward from the swing arm, and the other end of the swing arm is a free end; the fixed shaft is fixed to the other end of the swing arm, and the bending wheel is mounted on the fixed shaft through a bearing, and a bending groove is formed between the upper end of the swing arm and the bending wheel. Therefore, when the pipe falls into the bending groove, the pipe bending drive cylinder is started, and the pipe bending drive cylinder drives the rack to move linearly, thereby driving the gear to rotate, the gear drives the rotating shaft to rotate, and the rotating shaft drives the swing arm to swing, thereby driving the bending wheel to swing. Under the action of the bending wheel and the rotating shaft, the pipe is bent.

[0024] Furthermore, the radial rotation device includes a clamping seat, a rotation module, a clamping module, a clamping device and a cylinder. The clamping seat is connected to the frame through the clamping device. The clamping device includes a bottom plate, a cylinder is provided on the bottom plate, the bracket bottom plate of the clamping seat is connected to the cylinder, and the clamping seat is supported by the front bracket plate and the rear bracket plate and connected to the bracket bottom plate. The radial rotation device can be moved up and down by controlling the cylinder, so that the radial rotation device can be separated from the workpiece during the bending process, eliminating the possible obstruction of the device to the bending process.

[0025] Furthermore, the rotary module includes a rotary motor, a rotary driving gear, and a rotary driven gear. The rotary motor is fixedly installed inside the clamp seat through a rotary motor fixing plate. The rotary driving gear is connected to the rotary motor and cooperates with the rotary driven gear connected to the top of the clamp seat to achieve radial rotation. A clamping module is provided on the rotary driven gear. An arc groove is provided at the position where the rotary driven wheel is located at the top of the clamp seat. A zeroing positioning rod fixed to the clamp seat is placed on the arc groove. The rotary driven gear can be rotated to its original position through the zeroing positioning rod.

[0026] Furthermore, the clamping module includes a clamping cylinder, a rotary core seat and a clamping block, the rotary core seat is connected to a rotary driven gear, a clamping block is provided in the rotary core seat, and the clamping block is connected to a clamping cylinder fixed on the rotary core seat. Thus, during bending, the clamping module is controlled to clamp the pipe material, and the rotary motor drives the rotary driving gear to control the rotary driven gear to make the clamping module rotate radially, so that the pipe material changes the bending plane.

[0027] Furthermore, the clamping device is installed on the platform by fixing screws, the clamping device includes a clamping seat and a clamping mechanism, the clamping seat spans the mounting groove and is fixed on the platform by fixing screws, the clamping mechanism includes a driving cylinder, a push rod, a fixing clamp and a rotating shaft, the driving cylinder is installed on the clamping seat, the driving cylinder is connected to the fixing clamp by the push rod, and the fixing clamp is connected to the clamping seat by the rotating shaft. After the pipe is clamped by the clamping device, the processing origin of the pipe remains unchanged during the bending process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional structural schematic diagram of the bending machine of the present invention;

[0029] Figure 2 A schematic diagram of a baffle of the right side view of the bending machine of the present invention;

[0030] Figure 3 It is an exploded schematic diagram of the centering device of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the bending device of the present invention;

[0032] Figure 5 It is a schematic diagram of the radial rotating device of the present invention on the bending machine;

[0033] Figure 6 It is a schematic structural diagram of the radial rotating device of the present invention;

[0034] Figure 7 for Figure 1 A magnified view of middle;

[0035] Figure 8 for Figure 1 Enlarged view of middle B;

[0036] Fig. 9 for Figure 1 Enlarged view of middle C;

[0037] Fig.10 for Figure 1 Enlarged view of middle D;

[0038] Fig.11 It is a cross-sectional view of the clamping and fixing device of the present invention. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figures 1 to 11 As shown, a radially loaded, rotating and centering pipe bending device of the present invention comprises a bending machine 1 and a radial rotating device 2.

[0041] like Figures 1 to 11 As shown, the bending machine 1 includes a frame 11 , a bending device 3 , a centering device 4 and a clamping and fixing device 6 .

[0042] The frame 11 comprises a frame body 111 and a platform 112 mounted on the frame body 111 , and a mounting groove 113 is provided on the platform 112 along the length direction.

[0043] Baffles 5 are provided on both sides of the platform 112, and a centering device 4 is provided on each baffle 5. The centering device 4 is connected to the baffle 5 through a connecting limit seat 41, and a guide hole 411 is provided on the connecting limit seat. The stepping motors 42 of the centering devices 4 on both sides are synchronously driven to realize the centering function. A feeding mechanism 51 is provided above the centering device 4. One or more bending devices 3 are provided on the frame 11 between the two baffles and at the installation groove 113. A radial rotating device 2 is provided on the platform located at the installation groove 113, and the radial rotating device includes a clamping seat 21, a clamping module 24 and a rotating module 23.

[0044] like Figure 1 and Figure 2 As shown, one or more feeding mechanisms 51 are respectively provided on the baffles 5 on both sides of the bending machine 1. The feeding mechanisms 51 are installed above the centering device 4 and cooperate with the centering device to perform pipe bending. The feeding mechanism 51 includes a limit module 52 and a guide trough 53. The guide trough 53 is formed by a square short pressure plate 531 and a supporting plate installed on the baffle 5. The long end of the supporting plate 532 is longer than the square short pressure plate 531. The limit module 52 is connected to the end of the guide trough 53. The lower end of the supporting plate 532 is connected to the limit block 521 of the limit module 52. The limit module 52 is composed of a limit block 521 and a pushing mechanism 54. A groove 5211 is provided at the connection between the limit block 521 and the guide trough 53. The limit block 521 is located in front of the groove 5211 and the upper end is a convex arc surface. A stop block 55 (at the front of the limit block 521) is provided in front of the limit block 521 along the feeding direction. Figure 1 and Figure 7 As shown in the figure, a feeding trough 57 is formed between the stopper 55 and the limit block 521. The pushing mechanism 54 is connected and installed on the limit block 521, and the pushing mechanism 54 includes a pushing cylinder 541, a pushing upper seat 542 and a pushing block 540. The pushing cylinder 541 is installed on the baffle 5, and the pushing upper seat 542 is located above the pushing cylinder. The pushing upper seat 542 is provided with a slide groove 5421, and the pushing block 540 (in the slide groove) is slidably provided. Figure 1 and Figure 7As shown in the figure, the piston rod of the pushing cylinder is connected to the pushing block 540, and the pushing cylinder can drive the pushing block 540 to move up and down along the slide groove. The top of the pushing block is an inclined surface inclined downward along the feeding direction. The pushing mechanism 54 is arranged below the groove 5211, and the top of the pushing mechanism 54 is lower than the groove 5211 of the limit block 521.

[0045] like Figure 3 As shown, the centering device 4 includes a stepper motor 42, a screw rod 43 and a centering slider 44. The stepper motor 42 is connected and installed on the baffle 5 by a connection limit seat 41, the screw rod 43 is connected to the stepper motor 42, the centering slider 44 is slidably inserted in the guide hole 411, the centering slider 44 is threadedly connected to the screw rod 43, and the centering slider 44 is arranged below and outside the feed trough 57, and the top of the centering slider 44 is lower than the feed trough 57. When the stepper motor 42 is working, the stepper motor 42 drives the screw rod 43 to rotate, and the screw rod 43 drives the centering slider 44 to move linearly along the guide hole 441.

[0046] like Figure 1 and Figure 4 As shown, the bending device 3 is connected by screws 30 (in Figure 1 ) is fixedly mounted on the platform 112, such as Figure 1 , 4 and Figure 8As shown, the bending device 3 includes a bending seat 31, a bending drive mechanism and a bending mechanism. The bending seat 31 spans across the mounting groove, and the bending seat 31 is fixed to the platform 112 by screws 30. The bending drive mechanism includes a bending tube drive cylinder 32, a rack 33, a gear 34 and a rotating shaft 35. The bending tube drive cylinder 32 is installed on the bending seat 31. In another embodiment, the bending tube drive mechanism can also be driven by a stepper motor or a servo motor (if a stepper motor or a servo motor is used, the gear rack structure should be changed to a worm gear structure). The rack 33 is arranged on the bending seat 31 to slide horizontally, and the output shaft of the bending tube drive cylinder 32 is connected to the rack 33; the rotating shaft 35 is axially and vertically installed on the bending seat 31 through a bearing; the gear 34 is installed on the rotating shaft 35, and the rack 33 is meshed with the gear 34. The bending mechanism includes a swing arm 36, a fixed shaft 37 and a bending wheel 38; one end of the swing arm 36 is mounted on the rotating shaft 35, the rotating shaft 35 protrudes upward from the swing arm 36, and the other end of the swing arm 36 is a free end; the fixed shaft 37 is fixed to the other end of the swing arm 36, the bending wheel 38 is mounted on the fixed shaft 37 through a bearing, and a bending groove 39 is formed between the upper end of the swing arm 36 and the bending wheel 38. When the pipe material 100 falls into the bending groove 39, the pipe bending drive cylinder 32 is started, the pipe bending drive cylinder 32 drives the rack 33 to move linearly, thereby driving the gear 34 to rotate, the gear 34 drives the rotating shaft 35 to rotate, the rotating shaft 35 drives the swing arm 36 to swing, thereby driving the bending wheel 38 to swing, and under the action of the bending wheel 38 and the rotating shaft 35, the pipe material 100 is axially bent.

[0047] like Figure 1 , Figure 5 and Figure 6 and Fig. 9 As shown, the radial rotation device 2 includes a clamping seat 21, a rotation module 23, a clamping module 24, a clamping fixture 6 and a cylinder 7. The clamping seat 21 is connected to the frame 11 through the clamping fixture 6, and the clamping fixture 6 includes a bottom plate 60, on which the cylinder 7 is arranged, and the support bottom plate 211 of the clamping seat 21 is connected to the cylinder 7, and the clamping seat 21 is supported by the front support plate 212 and the rear support plate 213 and connected to the support bottom plate 211.

[0048] like Figure 1 and Figure 6 and Fig. 9As shown, the rotary module 23 includes a rotary motor 231, a rotary driving gear 232, and a rotary driven gear 233. The rotary motor 231 is fixedly installed inside the clamp seat 21 through a rotary motor fixing plate 2311. The rotary driving gear 232 is connected to the rotary motor 231 and cooperates with the rotary driven gear 233 connected to the top of the clamp seat 21 to achieve radial rotation. A clamping module 24 is provided on the rotary driven gear 233. A zeroing positioning rod 2331 is provided at the position where the rotary driven gear 233 is located at the top of the clamp seat 21. The clamping module 24 includes a clamping cylinder 241, a rotary core seat 242 and a clamping pressure block 243 (at Fig. 9 As shown in the figure, the rotary core seat 242 is connected to the rotary driven wheel 233, and a clamping pressure block 243 is provided in the rotary core seat 242, and the clamping pressure block 243 is connected to the clamping cylinder 241 fixed on the rotary core seat 242.

[0049] like Figure 1 and Fig.10 and Fig.11 As shown, the clamping device 6 is fixed by a screw 61 ( Figure 1 ) is installed on the platform 112, the clamping and fixing device 6 includes a clamping and fixing seat 62 and a clamping mechanism 63, the clamping and fixing seat 62 spans the mounting groove 113 and is fixed to the platform 112 by a fixing screw 61, the clamping mechanism 63 includes a driving cylinder 631, a push rod 632, a fixing clamp 64 and a rotating shaft 641, the driving cylinder 631 is installed on the clamping and fixing seat 62, the output shaft of the driving cylinder 631 is connected to the fixing clamp 64 through the push rod 632, and the fixing clamp 64 is connected to the clamping and fixing seat 62 through the rotating shaft 641.

[0050] The above-mentioned structure is a radially loaded rotation and centering positioning bending device, which adopts radial loading to clamp the workpiece and realize the rotation of the workpiece so as to perform bending processing on the workpiece along different bending planes. The centering device accurately centers and positions the workpiece to facilitate the determination of the processing origin. The centering devices on both sides are synchronously driven to accurately adjust the centering position, and the workpiece is clamped by a clamping and fixing device to keep the processing origin unchanged. All devices and baffles located on the mounting groove can be moved along the mounting groove and fixed at different positions of the mounting groove so as to perform bending at different positions, thereby realizing bending processing at different positions and different bending planes.

Claims

1. A pipe bending device with radial loading, rotation and centering positioning, comprising a bending machine and a radial rotation device, characterized in that: The bending machine comprises a frame, a bending device, a centering device and a clamping and fixing device, the frame comprises a frame body and a platform installed on the frame body, a mounting groove is provided on the platform along the length direction, baffles are provided on both sides of the platform, and a centering device is provided on each of the baffles on both sides, the centering device is connected to the baffle through a connecting limit seat, a guide hole is provided on the connecting limit seat, and the stepping motors of the centering devices on both sides are synchronously driven to realize the centering function, a feeding mechanism is provided above the centering device, and more than one bending device is provided on the frame between the two baffles and at the mounting groove, a radial rotating device is provided on the platform located at the mounting groove, the radial rotating device comprises a clamping seat, a clamping module and a rotating module, a clamping and fixing device is provided on the platform located at the mounting groove, and all devices and baffles located on the mounting groove can move along the mounting groove and be fixed at different positions of the mounting groove; The bending device is fixedly mounted on the platform by screws, and the bending device comprises a bending seat, a bending drive mechanism and a bending mechanism. The bending seat is fixed to the platform by screws, and the bending drive mechanism comprises a bending drive cylinder, a rack, a gear and a rotating shaft. The bending drive cylinder is mounted on the bending seat, and the rack is laterally slidably arranged on the bending seat, and the output shaft of the bending drive cylinder is connected to the rack; the rotating shaft is axially and vertically mounted on the bending seat through a bearing; the gear is mounted on the rotating shaft, and the rack is meshed with the gear; the bending mechanism comprises a swing arm, a fixed shaft and a bending wheel; one end of the swing arm is mounted on the rotating shaft, the rotating shaft protrudes upward from the swing arm, and the other end of the swing arm is a free end; the fixed shaft is fixed to the other end of the swing arm, and the bending wheel is mounted on the fixed shaft through a bearing, and a bending groove is formed between the upper end of the swing arm and the bending wheel; The clamping and fixing device is installed on the platform by fixing screws. The clamping and fixing device includes a clamping and fixing seat and a clamping mechanism. The clamping and fixing seat spans the mounting groove and is fixed to the platform by fixing screws. The clamping mechanism includes a driving cylinder, a push rod, a fixing clamp and a rotating shaft. The driving cylinder is installed on the clamping and fixing seat. The driving cylinder is connected to the fixing clamp by a push rod, and the fixing clamp is connected to the clamping and fixing seat by a rotating shaft.

2. A radially loaded, rotating and centering pipe bending device according to claim 1, characterized in that: There is one or more feeding mechanisms on the baffles on both sides of the bending machine, and the feeding mechanisms include a limit module and a material guide trough. The material guide trough is formed by a square short pressure plate and a supporting plate installed on the baffle. The upper end of the supporting plate is longer than the square short pressure plate. The limit module is connected to the end of the material guide trough, and the lower end of the supporting plate is connected to the limit block of the limit module. The limit module is composed of a limit block and a pushing mechanism. A groove is opened at the connection between the limit block and the material guide trough. The limit block is located in front of the groove and the upper end is a convex arc surface. A stop block is provided in front of the limit block along the feeding direction, and a feeding trough is formed between the stop block and the limit block.

3. A radially loaded, rotating and centering pipe bending device according to claim 2, characterized in that: The pushing mechanism is connected and installed on the limit block. The pushing mechanism includes a pushing cylinder, a pushing upper seat and a pushing block. The pushing cylinder is installed on the pushing upper seat. The pushing upper seat is installed on the baffle. The pushing upper seat is located above the pushing cylinder. A slide groove is provided on the pushing upper seat. A pushing block is slidably provided in the slide groove. The piston rod of the pushing cylinder is connected to the pushing block. The pushing cylinder can drive the pushing block to move up and down along the slide groove. The top end of the pushing block presents an inclined surface inclined downward along the feeding direction. The pushing mechanism is arranged below the groove, and the top end of the pushing mechanism is lower than the groove of the limit block.

4. A radially loaded, rotating and centering pipe bending device according to claim 2, characterized in that: The centering device includes a stepper motor, a screw rod and a centering slider. The stepper motor is installed on the baffle through a connecting limit seat. The screw rod is connected to the stepper motor. The centering slider is slidably inserted in the guide hole. The centering slider is threadedly connected to the screw rod. The centering slider is arranged below and outside the feed trough, and the top of the centering slider is lower than the feed trough.

5. A radially loaded, rotating and centering pipe bending device according to claim 1, characterized in that: The radial rotating device includes a clamping seat, a rotating module, a clamping module, a clamping fixing device and a cylinder. The clamping seat is connected to the frame through the clamping fixing device. The clamping fixing device includes a base plate, and a cylinder is provided on the base plate. The bracket base plate of the clamping seat is connected to the cylinder. The clamping seat is supported by a front bracket plate and a rear bracket plate and is connected to the bracket base plate.

6. A radially loaded, rotating and centering pipe bending device according to claim 5, characterized in that: The rotary module includes a rotary motor, a rotary driving gear, and a rotary driven gear. The rotary motor is fixedly installed inside the clamp seat through a rotary motor fixing plate. The rotary driving gear is connected to the rotary motor and cooperates with the rotary driven gear connected to the top of the clamp seat to achieve radial rotation. A clamping module is provided on the rotary driven gear. An arc groove is provided at the position of the rotary driven gear located at the top of the clamp seat, and a zeroing positioning rod fixed to the clamp seat is placed on the arc groove.

7. A radially loaded, rotating and centering pipe bending device according to claim 6, characterized in that: The clamping module comprises a clamping cylinder, a rotary core seat and a clamping pressure block. The rotary core seat is connected to the rotary driven gear. A clamping pressure block is arranged inside the rotary core seat. The clamping pressure block is connected to the clamping cylinder fixed on the rotary core seat.

8. A pipe bending method using a radially loaded, swiveling and centering pipe bending device according to claim 1, characterized in that: The following steps are involved: a) According to the shape of the tube to be bent, adjust and move the device on the bending machine, and fix it after adjustment; b) Store the pipe in the feeding mechanism, start the bending machine, and push the pipe to the centering device through the pushing mechanism; c) The centering device detects the pipe material, and the stepper motors on both sides are driven synchronously to perform the centering operation; d) After the alignment is completed, the clamping device is started to clamp the pipe material so that the pipe material does not move; e) The bending device is started and a bending operation is completed; f) After the radial rotary device detects that the bending is complete, the clamping module is started to clamp the pipe; g) After clamping the pipe, start the rotary module to make the pipe rotate radially; h) After the rotation is completed, the bending device performs the bending operation again; i) During the bending process, the radial rotating device is controlled by the cylinder to move up and down, so as to avoid the pipe material and ensure that the bending process will not be hindered; j) After bending, the radial rotating device rotates back to its original position, the bending machine finishes working, and waits for the tube to be taken out for the next bending.

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