Pipe bending apparatus and method

Abstract

The application discloses a pipe bending device and method, and belongs to the technical field of pipe bending. The pipe bending device comprises a rack, a wheel mold assembly, a main mold clamping assembly, an auxiliary mold clamping assembly and a power mechanism. The wheel mold assembly comprises at least one wheel mold, and the wheel mold is provided with a wheel mold pipe groove. The main mold clamping assembly comprises a main mold supporting plate, at least one main mold clamping and a main mold adjusting mechanism. The main mold clamping is provided with a main mold pipe groove. The main mold clamping is matched with the wheel mold to clamp or release the pipe. The wheel mold is arranged on the main mold supporting plate. The auxiliary mold clamping assembly comprises an auxiliary mold supporting plate, at least one auxiliary mold clamping and an auxiliary mold adjusting mechanism. The auxiliary mold clamping is provided with an auxiliary mold pipe groove. The pipe bending device has the advantages of simple and compact structure, small floor space, convenience in carrying and on-site bending of required pipes. The device can select the number of wheel molds according to the pipe bending requirement, solves the problems that only one pipe diameter can be bent at the same time and the mold needs to be frequently replaced, and greatly improves the operation efficiency of on-site automatic pipe bending.

Description

TECHNICAL FIELD

[0001] The present application relates to a pipe bending device and method, belonging to the technical field of pipe bending. BACKGROUND

[0002] In the modern industrial field, the application of pipe is very wide, and pipe bending is a common process in production. In the refrigeration industry, for example, some pipe bending in compressor assembly needs to be made on site. The on-site pipe bending has the characteristics of multiple varieties, small batch size and low standardization. The on-site pipe bending cannot use large pipe bending equipment such as numerical control pipe bending equipment. Although the numerical control pipe bending equipment reduces the labor intensity of workers and has high pipe bending efficiency, such pipe bending equipment is generally complex in structure, large in size and long in debugging time, and is more suitable for processing large batch of single variety of pipe.

[0003] However, the pipe bender used on site for pipe bending is mostly manually bent. For example, a manual pipe bender uses rollers and handles to place the pipe to be processed between the rollers, and then acts on the pipe through the handle to realize pipe bending. Such a pipe bender is inconvenient to operate for metal pipe bending required in the unit, has low production efficiency, is affected by the skill level of the operator and bending technology, and cannot guarantee the quality of pipe bending, and the labor cost is also high.

[0004] In addition, the existing pipe bender needs to replace the mold when bending pipes of different diameters, and is not suitable for single-piece small-batch production mode. SUMMARY

[0005] The present application provides a pipe bending device and method to solve the above technical problems.

[0006] The technical solution of the present application to solve the above technical problems is as follows: a pipe bending device, comprising a rack, a wheel mold assembly arranged on the rack, a main clamp mold assembly cooperating with the wheel mold assembly to clamp the pipe, and a power mechanism for driving the wheel mold assembly and the main clamp mold assembly to rotate, the wheel mold assembly comprises at least one wheel mold, the working surface of the wheel mold is provided with a wheel mold pipe groove, the wheel mold pipe groove comprises an arc pipe groove for bending the pipe and a straight pipe groove for clamping the pipe.

[0007] The main die assembly comprises a main die support plate, a main die fixing frame arranged on the main die support plate, at least one main die arranged on the main die fixing frame, and a main die adjusting mechanism for adjusting the position of the main die fixing frame, the working surface of the main die is provided with a main die pipe groove matched with the straight pipe groove, under the action of the main die adjusting mechanism, the main die is close to the wheel die and matches the pipe to hold or is away from the wheel die to release the pipe, the wheel die is arranged on the main die support plate, and the main die support plate rotates under the action of the power mechanism.

[0008] The auxiliary die assembly for pressing and auxiliary pushing of the pipe comprises an auxiliary die support plate, an auxiliary die pushing fixing frame arranged on the auxiliary die support plate, at least one auxiliary die arranged on the auxiliary die pushing fixing frame, and an auxiliary die adjusting mechanism for adjusting the position of the auxiliary die pushing fixing frame, the auxiliary die support plate is arranged on the rack, and the working surface of the auxiliary die is provided with an auxiliary die pipe groove corresponding to the position of the wheel die pipe groove and used for positioning the pipe.

[0009] The beneficial effects of the present application are that the pipe is held by the main die and the wheel die, the pipe is supported by the auxiliary die, and the pipe is bent under the action of the power mechanism, the wheel die assembly, the main die assembly and the auxiliary die assembly are arranged on the rack, the structure is simple and compact, the space is greatly saved, the floor area is reduced, the pipe required to be bent on site is facilitated, and the device is suitable for operation in a narrow space; the number of the wheel dies can be selected according to the bending requirement of the pipe, the number of the wheel dies and the wheel die pipe grooves are determined, which means that the main die and the auxiliary die matched with the wheel die are determined, the wheel die, the main die and the auxiliary die are convenient and fast to replace, not only the requirement of rapid replacement can be met, but also the problem that only one pipe diameter pipe can be bent and the mold is frequently replaced when different pipe diameters are bent can be solved, and the operation efficiency of on-site pipe bending is greatly improved.

[0010] On the basis of the above technical scheme, the present application can be further improved as follows.

[0011] Further, the auxiliary die is connected with the auxiliary die pushing fixing frame through a follow-up mechanism, the follow-up mechanism comprises a pushing upper baffle, an auxiliary die fixing bolt and a plurality of universal balls, one end of the pushing upper baffle is connected with the auxiliary die pushing fixing frame, the other end of the pushing upper baffle extends to the upper side of the auxiliary die, and the pushing upper baffle is connected with the auxiliary die through the auxiliary die fixing bolt, the pushing upper baffle is provided with a long hole for the rod part of the auxiliary die fixing bolt to move, the plurality of universal balls are arranged on the auxiliary die pushing fixing frame, and the spherical bodies of the universal balls act on the support surface of the auxiliary die.

[0012] The beneficial effect of the further scheme is that the auxiliary clamp mold provides sufficient pressing force for the pipe and plays an auxiliary pushing role in the pipe bending process, reducing the thinning amount of the pipe in the pipe bending process and improving the roundness of the bent pipe part. During the pipe bending process, the bending position will stretch the outside and extrude the inside of the pipe, causing the pipe supported on the auxiliary clamp mold to move due to the stretching. If the auxiliary clamp mold is directly fixed and installed on the auxiliary mold pushing fixed frame and does not move, the pipe will move a certain amount relative to the auxiliary clamp mold during the pipe bending process. The friction between the pipe and the auxiliary clamp mold during the pipe bending process will cause wear on the surface of the pipe and even the auxiliary mold pipe groove of the auxiliary clamp mold, resulting in poor appearance of the bent pipe. If the friction between the pipe and the auxiliary clamp mold is too large, the pipe may not move during the bending process, which will affect the bending effect of the pipe. The design of the follow-up mechanism enables the auxiliary clamp mold to not only support the pipe at all times during the pipe bending process, but also move with the pipe, thereby meeting the requirements of the pipe bending process. The pipe bent with the assistance of the follow-up mechanism has an attractive appearance and no wear, and meets the requirement of smooth surface of the pipe during the pipe bending deformation process. The contact between the spherical surface of the universal ball and the supporting surface of the auxiliary clamp mold provides sufficient pre-tightening force for the auxiliary clamp mold, reduces the friction of the auxiliary clamp mold during movement, improves the movement speed of the auxiliary clamp mold, and reduces the thinning amount of the pipe during bending.

[0013] Further, the follow-up mechanism further comprises an upper positioning block and a lower positioning block for guiding and limiting the movement of the auxiliary clamp mold. The upper positioning block is arranged on the pushing upper baffle, and the lower positioning block is arranged on the auxiliary mold pushing fixed frame through a pushing lower baffle arranged below the auxiliary clamp mold.

[0014] The beneficial effect of the further scheme is that the pushing lower baffle is connected with the auxiliary mold pushing fixed frame, and the lower positioning block is connected with the pushing lower baffle. In order to ensure the direction of the movement of the auxiliary clamp mold and make the supporting surface of the auxiliary clamp mold always act on the universal ball, the upper positioning block and the lower positioning block are added, which act on the working surface side of the auxiliary clamp mold respectively to constrain the movement of the auxiliary clamp mold and avoid the auxiliary clamp mold from being separated from the support of the universal ball during movement.

[0015] Further, the main clamp mold and the main mold fixing frame are provided with a quick mold changing mechanism, the quick mold changing mechanism comprises a dovetail block, a locking block arranged on the dovetail block and a locking bolt, the main clamp mold is provided with a dovetail groove for positioning the dovetail block, the front end of the locking block is threadedly connected with the dovetail block, the rear part of the locking block is in a cylindrical structure, the main mold fixing frame is provided with a round hole for accommodating the cylindrical structure, the surface of the cylindrical structure is provided with a locking ring groove, the rear wall of the locking ring groove is arranged in an inclined manner, the main mold fixing frame is provided with a bolt hole for mounting the locking bolt, the rod end of the locking bolt passes through the bolt hole and acts on the locking ring groove.

[0016] The beneficial effect of the above further scheme is that the main clamp mold is separated from the main mold fixing frame by loosening the locking bolt on the side of the main mold fixing frame, the main clamp mold is removed for replacement, the main clamp mold and the main mold fixing frame are fixedly connected by the way of the locking bolt pressing the locking block, and the replacement of the main clamp mold is convenient and fast.

[0017] Further, the main mold adjusting mechanism comprises a main mold screw rod fixing seat, a main clamp feeding pressing screw rod and a main locking block for assisting locking of the main clamp feeding pressing screw rod, the main mold screw rod fixing seat is provided with a main screw rod through hole through which the main clamp feeding pressing screw rod passes, the rod end of the main clamp feeding pressing screw rod is rotationally connected with the main mold fixing frame through the main screw rod through hole, the main locking block is rotationally arranged on the main mold screw rod fixing seat, the main locking block is provided with a main locking groove matched with the rod part of the main clamp feeding pressing screw rod, and the main locking groove is provided with a screw thread matched with the surface of the main clamp feeding pressing screw rod.

[0018] The beneficial effect of the above further scheme is that the main mold screw rod fixing seat is used for providing support for the main clamp feeding pressing screw rod and limiting shaking of the main clamp feeding pressing screw rod, and is beneficial to rapid feeding of the main clamp feeding pressing screw rod; after the rapid feeding of the main clamp feeding pressing screw rod, the main clamp feeding pressing screw rod is locked by rotating the main locking block. The screw thread in the main locking groove and the screw thread of the main clamp feeding pressing screw rod are matched and engaged to have a self-locking function, so that the situation that the main clamp mold is damaged due to too large bending torque during pipe bending can be avoided. Rotating the main clamp feeding pressing screw rod makes the main clamp mold slowly close to the wheel mold, reduces the gap between the main clamp mold and the wheel mold, increases the clamping force of the main clamp mold and the wheel mold on the pipe, the main clamp mold is rapidly fed and locked through the main mold adjusting mechanism, the main clamp mold can better cooperate with the wheel mold to clamp the pipe, and thus the requirement of high quality pipe bending is met.

[0019] Further, the auxiliary die adjusting mechanism comprises an auxiliary die screw fixing seat, an auxiliary clamp feeding jacking screw, and an auxiliary locking block for locking the auxiliary clamp feeding jacking screw, the auxiliary die screw fixing seat is provided with an auxiliary screw through hole through which the auxiliary clamp feeding jacking screw passes, the rod end of the auxiliary clamp feeding jacking screw is rotationally connected with the auxiliary die pushing fixing frame through the auxiliary screw through hole, the auxiliary locking block is rotationally arranged on the auxiliary die screw fixing seat, the auxiliary locking block is provided with an auxiliary locking groove matched with the rod part of the auxiliary clamp feeding jacking screw, and the auxiliary locking groove is provided with a screw thread matched with the surface of the auxiliary clamp feeding jacking screw.

[0020] The auxiliary die screw fixing seat is used to provide support for the auxiliary clamp feeding jacking screw and limit the shaking of the auxiliary clamp feeding jacking screw, and is beneficial to the rapid feeding of the auxiliary clamp feeding jacking screw; after the rapid feeding of the auxiliary clamp feeding jacking screw, the auxiliary clamp feeding jacking screw is locked by rotating the auxiliary locking block, the screw thread in the auxiliary locking groove is matched and engaged with the screw thread of the auxiliary clamp feeding jacking screw to have a self-locking function, which can avoid the situation that the thread is damaged due to excessive bending torque during the bending process of the pipe.

[0021] Further, the wheel die is two or more, the main clamp die and the auxiliary clamp die are consistent with the number of the wheel die, adjacent wheel dies are arranged up and down along the height direction, and the two or more wheel dies are provided with the wheel die pipe grooves for bending pipes with the same pipe diameter or pipes with different pipe diameters.

[0022] The above further scheme has the beneficial effect that multiple wheel dies can be provided according to the pipe diameter of the pipe to be bent or the number of the pipe, the wheel dies are arranged along the height direction, which not only saves space, but also can process two or more pipes at the same time, further improving the bending efficiency of the pipe, such as arranging three wheel dies along the height direction.

[0023] Further, the contact surfaces between adjacent wheel dies and / or the wheel dies and the main die support plate are connected through keys.

[0024] The above further scheme has the beneficial effect that the keys ensure that each wheel die can rotate synchronously with the power mechanism. For example, the bottom surface of the upper wheel die is provided with an upper wheel die key groove, the top surface of the lower wheel die adjacent to the upper wheel die is provided with a lower wheel die key groove, and the upper and lower wheel dies rotate synchronously through the wheel die keys in the upper and lower wheel die key grooves.

[0025] Further, the power mechanism comprises a driving motor, a speed reducer and a rotating shaft, the rotating shaft is connected with the workbench of the frame through a bearing, the rotating shaft is connected with the main mold support plate, the input end of the rotating shaft is connected with the output end of the speed reducer, and the output end of the driving motor is connected with the input end of the speed reducer.

[0026] The beneficial effect of the above further scheme is that the driving motor transmits power to the speed reducer to realize speed reduction and torque increase, the lower end of the rotating shaft is connected with the output end of the speed reducer, and the rotating shaft drives the main mold support plate to rotate as the speed reducer rotates, thereby realizing the rotating movement of the wheel mold and the main clamp mold.

[0027] Further, the wheel mold is connected with the rotating shaft through a wheel mold fixing bolt, the wheel mold has a wheel mold through hole through which the rod part of the wheel mold fixing bolt passes, and the rotating shaft is provided with a threaded hole for mounting the wheel mold fixing bolt.

[0028] The beneficial effect of the above further scheme is that the upper end face of the rotating shaft has a threaded hole, the wheel mold fixing bolt is threadedly connected with the threaded hole on the rotating shaft through the wheel mold through hole, so that the wheel mold and the main mold support plate are constrained on the rotating shaft, the wheel mold is axially fixed, and the rotating shaft can drive the wheel mold and the main clamp mold to rotate.

[0029] Further, the rotating shaft is connected with the main mold support plate through a key.

[0030] The beneficial effect of the above further scheme is that the rotating shaft is connected with the main mold support plate through a key, the rotating shaft drives the main mold support plate to rotate, the position of the key groove on the rotating shaft can be appropriately higher, so that there is a certain gap between the main mold support plate and the workbench of the frame, and the friction when the main mold support plate rotates is reduced.

[0031] Further, the frame further comprises a support assembly, the support assembly comprises a support leg plate and a support leg cover plate, the workbench is arranged on the top of the support leg plate, the support leg cover plate is arranged on the support leg plate and is provided with a containing cavity between the support leg plate, and the power mechanism is arranged in the containing cavity.

[0032] The beneficial effect of the above further scheme is that the frame supports the wheel mold assembly, the main clamp mold assembly and the auxiliary clamp mold assembly, simultaneously increases the height of the workbench for pipe bending, and facilitates the installation of the power mechanism in the frame to meet the driving of the rotating movement of the wheel mold and the main clamp mold.

[0033] The present application also relates to a pipe bending method, and the pipe bending device is used.

[0034] 1) The pipe is placed in the wheel mold pipe groove of the wheel mold assembly.

[0035] 2) quickly push the main clamp feeding jack screw of the main mold adjusting mechanism forward, the main clamp mold preliminarily positions the pipe with the wheel mold; quickly push the auxiliary clamp feeding jack screw of the auxiliary mold adjusting mechanism forward, the auxiliary clamp mold preliminarily positions the pipe;

[0036] 3) press the front part of the main locking block of the main mold adjusting mechanism, the main locking groove of the main locking block is threadedly matched with the main clamp feeding jack screw, rotate the main clamp feeding jack screw, so that the main clamp mold continues to move forward, the main clamp mold clamps the pipe with the wheel mold; press the front part of the auxiliary locking block of the auxiliary mold adjusting mechanism, the auxiliary locking groove of the auxiliary locking block is threadedly matched with the auxiliary clamp feeding jack screw, rotate the auxiliary clamp feeding jack screw, so that the auxiliary clamp mold continues to move forward, the auxiliary clamp mold clamps the pipe;

[0037] 4) the driving motor of the power mechanism acts, the rotating shaft of the power mechanism drives the main mold support plate to rotate, the main clamp mold and the wheel mold clamp the pipe to rotate to bend the pipe;

[0038] 5) after the pipe is bent, reverse rotate the main clamp feeding jack screw to loosen the main clamp mold, reverse rotate the auxiliary clamp feeding jack screw to loosen the auxiliary clamp mold;

[0039] 6) press the tail part of the main locking block, the main locking groove of the main locking block is threadedly separated from the main clamp feeding jack screw, quickly pull the main clamp feeding jack screw backward; press the tail part of the auxiliary locking block, the auxiliary locking groove of the auxiliary locking block is threadedly separated from the auxiliary clamp feeding jack screw, quickly pull the auxiliary clamp feeding jack screw backward, take out the bent pipe;

[0040] 7) the driving motor reverses, drives the main clamp mold to reset, waits for the bending of the next pipe.

[0041] The beneficial effects of the present application are that: after the pipe is placed in the wheel mold pipe groove, the main clamp mold and the auxiliary clamp mold are quickly fed to preliminarily position the pipe under the action of the main clamp feeding jack screw of the main mold adjusting mechanism and the auxiliary clamp feeding jack screw of the auxiliary mold adjusting mechanism, then the pipe is locked through the thread cooperation of the main clamp feeding jack screw and the main locking block of the main mold adjusting mechanism and the thread cooperation of the auxiliary clamp feeding jack screw and the auxiliary locking block of the auxiliary mold adjusting mechanism, then the power mechanism rotates, the main clamp mold and the wheel mold clamp the pipe to rotate to bend the pipe, the pipe positioning is fast during the whole bending process, the locking operation is convenient and fast, and the pipe bending is realized under the action of the power mechanism, the pipe bending processing efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of the present application;

[0043] Figure 2 It is a structural schematic diagram of the present application without a support assembly;

[0044] Figure 3 Front view structural schematic diagram of the present application without support assembly;

[0045] Figure 4 Top view structural schematic diagram of the present application without support assembly;

[0046] Figure 5 Left view structural schematic diagram of the present application without support assembly;

[0047] Figure 6 Structural schematic diagram of the wheel mold assembly of the present application;

[0048] Figure 7 Structural schematic diagram of the main clamp mold assembly of the present application;

[0049] Figure 8 Structural schematic diagram of the main clamp mold assembly of the present application from another angle;

[0050] Figure 9 Structural schematic diagram of the wheel mold B of the present application;

[0051] Figure 10 Structural schematic diagram of the main mold fixing frame and main mold support plate of the present application in cooperation state;

[0052] Figure 11 Structural schematic diagram of the present application Figure 10 Structural schematic diagram of the present application along the axial direction of the locking block;

[0053] Figure 12 Structural schematic diagram of the present application of the locking bolt and the locking block in cooperation state;

[0054] Figure 13 Structural schematic diagram of the auxiliary clamp mold assembly of the present application;

[0055] Figure 14 Structural schematic diagram of the present application in the state of bending pipe;

[0056] Figure 15 Structural schematic diagram of the present application in the state of bending pipe;

[0057] In the diagram, 1. Wheel mold assembly; 101. Wheel mold A; 102. Wheel mold B; 103. Wheel mold C; 104. Wheel mold tube groove; 1041. Arc-segment tube groove; 1042. Straight-segment tube groove; 105. Wheel mold fixing bolt; 2. Main clamping mold assembly; 201. Main mold support plate; 202. Main clamping mold A; 203. Main clamping mold B; 204. Main clamping mold C; 205. Main mold tube groove; 206. Main mold fixing frame; 2061. Round hole; 207. Main mold screw fixing seat; 208. Main clamping feed tightening screw; 209. Dovetail block; 210. Main locking block; 211. Locking block; 2110. Locking ring groove; 212. Locking bolt; 3. Auxiliary clamping mold assembly 301. Auxiliary mold support plate; 302. Auxiliary clamping mold A; 303. Auxiliary clamping mold B; 304. Auxiliary clamping mold C; 305. Auxiliary mold tube groove; 306. Auxiliary mold push fixing frame; 307. Push upper baffle; 3071. Long hole; 308. Auxiliary mold fixing bolt; 309. Universal ball; 310. Upper positioning block; 311. Lower positioning block; 312. Push lower baffle; 313. Auxiliary mold screw fixing seat; 314. Auxiliary clamping feed tightening screw; 315. Auxiliary locking block; 4. Frame; 401. Worktable; 402. Support leg plate; 403. Support leg cover plate; 5. Drive motor; 6. Reducer; 7. Rotary shaft; 701. Threaded hole; 8. Pipe. Detailed Implementation

[0058] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0059] like Figures 1-15 As shown, a pipe bending device includes a frame 4, a wheel mold assembly 1 mounted on the frame 4, a main clamping mold assembly 2 that cooperates with the wheel mold assembly 1 to clamp a pipe 8, and a power mechanism for driving the wheel mold assembly 1 and the main clamping mold assembly 2 to rotate. The wheel mold assembly 1 includes at least one wheel mold, and the working surface of the wheel mold is provided with a wheel mold pipe groove 104. The wheel mold pipe groove 104 includes an arc section pipe groove 1041 for bending the pipe 8 and a straight section pipe groove 1042 for clamping the pipe 8.

[0060] The main clamping mold assembly 2 includes a main mold support plate 201, a main mold fixing frame 206 disposed on the main mold support plate 201, at least one main clamping mold disposed on the main mold fixing frame 206, and a main mold adjusting mechanism for adjusting the position of the main mold fixing frame 206. The working surface of the main clamping mold is provided with a main mold tube groove 205 that cooperates with the straight section tube groove 1042. Under the action of the main mold adjusting mechanism, the main clamping mold approaches the wheel mold and cooperates with it to clamp the tube 8 or moves away from the wheel mold to release the bent tube 8. The wheel mold is disposed on the main mold support plate 201, and the main mold support plate 201 rotates under the action of the power mechanism.

[0061] Also included is a secondary clamp module assembly 3 for compacting and assisting in pushing the pipe 8, the secondary clamp module assembly 3 including a secondary mold support plate 301, a secondary mold pushing fixed frame 306 arranged on the secondary mold support plate 301, at least one secondary clamp arranged on the secondary mold pushing fixed frame 306, and a secondary mold adjusting mechanism for adjusting the position of the secondary mold pushing fixed frame 306, the secondary mold support plate 301 being arranged on the frame 4, and the working surface of the secondary clamp being provided with a secondary mold pipe groove 305 corresponding to the position of the wheel mold pipe groove 104 and used for positioning the pipe 8.

[0062] The above Figures 1-5 The pipe 8 is displayed on the pipe bending device.

[0063] The secondary clamp is connected to the secondary mold pushing fixed frame 306 through a follow-up mechanism, the follow-up mechanism including a pushing upper baffle 307, a secondary mold fixed bolt 308, and a plurality of universal balls 309, one end of the pushing upper baffle 307 being connected to the secondary mold pushing fixed frame 306, the other end extending above the secondary clamp, and the pushing upper baffle 307 being connected to the secondary clamp through the secondary mold fixed bolt 308, the pushing upper baffle 307 being provided with a long hole 3071 for the rod part of the secondary mold fixed bolt 308 to move, and the plurality of universal balls 309 being arranged on the secondary mold pushing fixed frame 306, the spherical surface of the universal ball 309 acting on the support surface of the secondary clamp. The function of the secondary clamp is to provide sufficient compacting force for the pipe 8 and to assist in pushing during pipe bending, thereby reducing the thinning amount of the pipe 8 during pipe bending and improving the roundness of the bent part. During the pipe bending process, the bending position will stretch the outside and extrude the inside of the pipe 8, causing the pipe 8 supported on the secondary clamp to move due to the stretching. If the secondary clamp is directly fixed and installed on the secondary mold pushing fixed frame 306 and does not move, the pipe 8 will move a certain amount relative to the secondary clamp during the pipe bending process. The pipe 8 acts on the secondary clamp, and the friction between the pipe 8 and the secondary clamp will cause wear on the surface of the pipe 8 and even the secondary mold pipe groove 305 of the secondary clamp, resulting in poor appearance of the pipe 8 after bending. If the friction between the pipe 8 and the secondary clamp is large, the pipe 8 may not be able to move during the bending process, which will affect the bending effect of the pipe 8. The design of the follow-up mechanism allows the secondary clamp to not only constantly support the pipe 8 during pipe bending, but also easily move along the long hole 3071 with the pipe 8, thereby meeting the requirements of pipe bending. The pipe 8 bent with the assistance of the follow-up mechanism has an attractive appearance without wear and meets the requirement of smooth surface of the pipe 8 during pipe bending deformation. The spherical surface of the universal ball 309 is in contact with the support surface of the secondary clamp, which provides sufficient pre-tightening force for the secondary clamp, reduces the friction when the secondary clamp moves, improves the moving speed of the secondary clamp, and reduces the thinning amount of the pipe 8 during bending.

[0064] The follow-up mechanism further comprises an upper positioning block 310 and a lower positioning block 311 for guiding and limiting the movement of the auxiliary clamp mold, the upper positioning block 310 is arranged on the pushing upper baffle 307, the lower positioning block 311 is arranged on the auxiliary mold pushing fixed frame 306 through a pushing lower baffle 312, and the pushing lower baffle 312 is arranged below the auxiliary clamp mold. In order to ensure the moving direction of the auxiliary clamp mold and make the supporting surface of the auxiliary clamp mold always act on the universal ball 309, the upper positioning block 310 and the lower positioning block 311 are added, and the upper positioning block 310 and the lower positioning block 311 act on the working surface side of the auxiliary clamp mold respectively, so as to constrain the movement of the auxiliary clamp mold and avoid that the auxiliary clamp mold is separated from the support of the universal ball 309 during the movement.

[0065] The quick mold changing mechanism is arranged between the main clamp mold and the main mold fixed frame 206, the quick mold changing mechanism comprises a dovetail block 209, a locking block 211 arranged on the dovetail block 209 and a locking bolt 212, the main clamp mold is provided with a dovetail groove for positioning the dovetail block 209, the front end of the locking block 211 is threadedly connected with the dovetail block 209, the rear part of the locking block 211 is in a cylindrical structure, the main mold fixed frame 206 is provided with a circular hole 2061 for accommodating the cylindrical structure, the surface of the cylindrical structure is provided with a locking ring groove 2110, the rear wall of the locking ring groove 2110 is arranged in an inclined manner, the main mold fixed frame 206 is provided with a bolt hole for mounting the locking bolt 212, and the rod end of the locking bolt 212 passes through the bolt hole and acts on the locking ring groove 2110. By loosening the locking bolt 212 on the side of the main mold fixed frame 206, the main clamp mold is separated from the main mold fixed frame 206, so that the main clamp mold can be removed and replaced, and the main clamp mold and the main mold fixed frame 206 are fixedly connected in a mode that the locking bolt 212 tightly presses the locking block 211, so that the main clamp mold is convenient and fast to replace. Specifically, the dovetail block 209 is provided with a screw hole, the main mold fixed frame 206 is provided with a circular hole 2061, the front end of the locking block 211 is provided with a thread, the locking block 211 is threadedly connected with the dovetail block 209 through cooperation with the screw hole, the rear end is inserted into the circular hole 2061 of the main mold fixed frame 206, the side of the main mold fixed frame 206 is provided with a bolt hole, the locking bolt 212 is screwed into the bolt hole from the side to tightly press the locking block 211, and cooperation between the locking bolt 212 and the locking block 211 can ensure that the main clamp mold is tightly fastened on the main mold fixed frame 206. The rear wall arranged in an inclined manner on the locking ring groove 2110 is beneficial to tightly locking the main clamp mold on the main mold fixed frame 206 by the locking bolt 212.

[0066] The main mold adjusting mechanism comprises a main mold screw fixing seat 207, a main clamp feeding jacking screw 208, and a main locking block 210 for assisting in locking the main clamp feeding jacking screw 208. The main mold screw fixing seat 207 is provided with a main screw through hole through which the main clamp feeding jacking screw 208 passes. The rod end of the main clamp feeding jacking screw 208 is rotationally connected to the main mold fixing frame 206 through the main screw through hole. The main locking block 210 is rotationally arranged on the main mold screw fixing seat 207 through a pin shaft. The main locking block 210 is provided with a main locking groove matched with the rod part of the main clamp feeding jacking screw 208. The main locking groove is provided with a thread matched with the surface of the main clamp feeding jacking screw 208. The thread is a trapezoidal thread.

[0067] The main mold screw fixing seat 207 is used to support the main clamp feeding and clamping screw 208 and limit the shaking of the main clamp feeding and clamping screw 208, and is beneficial to the rapid feeding of the main clamp feeding and clamping screw 208. After the rapid feeding of the main clamp feeding and clamping screw 208, the main clamp feeding and clamping screw 208 can be locked by rotating the main locking block 210. When the threads in the main locking groove are engaged with the threads of the main clamp feeding and clamping screw 208, the self-locking function is achieved, which avoids the damage of the main clamp feeding and clamping screw 208 caused by the excessive bending torque of the pipe during the bending process. The main locking groove is a groove matched with the surface of the main clamp feeding and clamping screw 208, and the surface of the groove has threads with the same pitch as the threads of the main clamp feeding and clamping screw 208, which can be trapezoidal threads. Before placing the pipe 8, the threads on the main locking block 210 are separated from the threads of the main clamp feeding and clamping screw 208, the main clamp feeding and clamping screw 208 can be pulled to quickly move the main clamp away from the wheel mold, then the pipe 8 is placed, and then the main clamp feeding and clamping screw 208 is quickly pushed forward to realize the preliminary clamping of the main clamp mold and the wheel mold on the pipe to be processed 8. Then the front part of the main locking block 210 is pressed down, so that the threads of the main locking groove are engaged with the threads of the main clamp feeding and clamping screw 208, and the main clamp feeding and clamping screw 208 is rotated, so that the main clamp mold and the wheel mold are engaged and the pipe to be processed 8 is clamped tightly. Then the power mechanism is actuated, the main clamp mold and the wheel mold clamp the pipe 8 to rotate, and the pipe 8 is bent. After bending, the main clamp feeding and clamping screw 208 is rotated in the opposite direction, the main clamp mold and the wheel mold are separated, the tail of the main locking block 210 is pressed down, the threads on the main locking block 210 are separated from the threads of the main clamp feeding and clamping screw 208, and the main clamp feeding and clamping screw 208 is pulled to quickly move the main clamp away from the wheel mold, and the pipe 8 is discharged. In order to meet the thread cooperation between the main locking block 210 and the main clamp feeding and clamping screw 208, the two sides of the main locking block 210 are tightly fitted with the installation groove of the main mold screw fixing seat 207, the main locking block 210 has a restraining force through the tight fit, so that the front part of the main locking block 210 can maintain the thread cooperation state with the main clamp feeding and clamping screw 208. When the front part of the main locking block 210 is pressed down, the main locking block 210 is not subjected to a radial force and can maintain the thread engagement state with the main clamp feeding and clamping screw 208. At the same time, the thread cooperation between the two can rotate the main clamp feeding and clamping screw 208 when the pipe 8 needs to be clamped, so as to realize the purpose of locking the main clamp mold and the wheel mold to clamp the pipe to be bent 8.

[0068] The rotation connection between the main clamp feeding and clamping screw 208 and the main mold fixed frame 206 can be achieved in the following way: the front end of the main clamp feeding and clamping screw 208 is provided with a main clamp disc, the main clamp disc is located in the groove of the main mold fixed frame 206, and the main clamp disc has the following functions: on the one hand, when the main clamp feeding and clamping screw 208 is quickly pushed and pulled, the main clamp disc can drive the main mold fixed frame 206 to move quickly; on the other hand, the main clamp feeding and clamping screw 208 is rotated in cooperation with the main locking block 210 to rotate the main clamp feeding and clamping screw 208, and the main clamp disc can push the main mold fixed frame 206 to move forward slowly.

[0069] The auxiliary mold adjusting mechanism comprises an auxiliary mold screw fixed seat 313, an auxiliary clamp feeding and clamping screw 314, and an auxiliary locking block 315 for locking the auxiliary clamp feeding and clamping screw 314, the auxiliary mold screw fixed seat 313 is provided with an auxiliary screw through hole through which the auxiliary clamp feeding and clamping screw 314 passes, the rod end of the auxiliary clamp feeding and clamping screw 314 is rotationally connected with the auxiliary mold pushing fixed frame 306 through the auxiliary screw through hole, the auxiliary locking block 315 is rotationally arranged on the auxiliary mold screw fixed seat 313 through a pin shaft, the auxiliary locking block 315 is provided with an auxiliary locking groove matched with the rod part of the auxiliary clamp feeding and clamping screw 314, and the auxiliary locking groove is provided with a thread matched with the surface of the auxiliary clamp feeding and clamping screw 314. The thread is a trapezoidal thread.

[0070] The auxiliary die screw fixing seat 313 is used to support the auxiliary clamp feeding and clamping screw 314 and limit the shaking of the auxiliary clamp feeding and clamping screw 314. Meanwhile, it is beneficial to the rapid feeding of the auxiliary clamp feeding and clamping screw 314. After the rapid feeding of the auxiliary clamp feeding and clamping screw 314, the auxiliary clamp feeding and clamping screw 314 can be locked by rotating the auxiliary locking block 315. The thread in the auxiliary locking groove and the thread of the auxiliary clamp feeding and clamping screw 314 are engaged with each other and have a self-locking function, which can avoid the damage of the thread caused by the backward movement of the auxiliary clamp die due to the excessive bending torque of the pipe during the pipe bending process. The auxiliary locking groove is a groove matched with the surface of the rod of the auxiliary clamp feeding and clamping screw 314, and the surface of the groove has the same thread as the pitch of the auxiliary clamp feeding and clamping screw 314, which can be trapezoidal thread. Before placing the pipe 8, the thread of the auxiliary locking block 315 is separated from the thread of the auxiliary clamp feeding and clamping screw 314. The auxiliary clamp die can be moved backward by pulling the auxiliary clamp feeding and clamping screw 314. Then the pipe 8 is placed, and then the auxiliary clamp feeding and clamping screw 314 is quickly pushed forward to preliminarily position the auxiliary clamp die for the pipe 8 to be processed. Then the front part of the auxiliary locking block 315 is pressed down so that the thread of the auxiliary locking groove is engaged with the thread of the auxiliary clamp feeding and clamping screw 314. The auxiliary clamp feeding and clamping screw 314 is rotated to make the auxiliary clamp die provide sufficient clamping force for the pipe 8 to be processed. Then the power mechanism is actuated, the main clamp die and the wheel die clamp the pipe 8 to rotate, the auxiliary clamp die clamps and pushes the pipe 8, so as to realize the bending of the pipe 8. After the bending is completed, the auxiliary clamp feeding and clamping screw 314 is rotated in the opposite direction, the auxiliary clamp die is separated from the pipe 8, the tail part of the auxiliary locking block 315 is pressed down, the thread on the auxiliary locking block 315 is separated from the thread of the auxiliary clamp feeding and clamping screw 314, the auxiliary clamp feeding and clamping screw 314 is pulled to make the auxiliary clamp die quickly move away from the pipe 8, and the pipe 8 is discharged. In order to meet the thread cooperation between the auxiliary locking block 315 and the auxiliary clamp feeding and clamping screw 314, the two sides of the auxiliary locking block 315 are tightly matched with the installation groove of the auxiliary clamp feeding and clamping screw 314. The tight fit has a restraining force on the auxiliary locking block 315, so that the auxiliary locking block 315 can maintain the thread cooperation state with the auxiliary clamp feeding and clamping screw 314 when the front part of the auxiliary locking block 315 is pressed down. The front part of the auxiliary locking block 315 is pressed down, the auxiliary locking block 315 is not subjected to the radial force, so it can maintain the thread engagement state with the auxiliary clamp feeding and clamping screw 314. Meanwhile, due to the thread cooperation between the two, the auxiliary clamp feeding and clamping screw 314 can be rotated to provide sufficient clamping force for the pipe 8 when the pipe 8 needs to be clamped. The auxiliary die adjusting mechanism can make the pipe 8 be in a suitable position and provide sufficient clamping force for the pipe 8 during the bending of the pipe 8, so as to meet the requirement of high-quality bending of the pipe 8.

[0071] The rotary connection between the auxiliary clamp feeding jacking screw 314 and the auxiliary die pushing fixed frame 306 can be achieved in the following way: the front end of the auxiliary clamp feeding jacking screw 314 is provided with an auxiliary clamp disc, the auxiliary clamp disc is located in the groove opened in the auxiliary die pushing fixed frame 306, and the auxiliary clamp disc has the following functions: on the one hand, when the auxiliary clamp feeding jacking screw 314 is quickly pushed and pulled, the auxiliary clamp disc can drive the auxiliary die pushing fixed frame 306 to move quickly; on the other hand, the auxiliary clamp feeding jacking screw 314 cooperates with the auxiliary locking block 315, and when the auxiliary clamp feeding jacking screw 314 is rotated, the auxiliary clamp disc can push the auxiliary die pushing fixed frame 306 to move forward slowly.

[0072] The two or more wheel dies are arranged in the height direction, and the wheel die pipe groove 104 for bending the pipe 8 with the same pipe diameter or the pipe 8 with different pipe diameters is arranged on the two or more wheel dies. According to the pipe diameter of the pipe 8 to be bent or the number of the pipe 8, a plurality of wheel dies can be provided, and the wheel dies are arranged in the height direction, which not only saves space, but also can simultaneously process two or more pipes 8, and further improves the bending efficiency of the pipe 8.

[0073] The contact surfaces between the adjacent wheel dies and / or the wheel dies and the main die support plate 201 are connected by keys. The key connection ensures that each wheel die can rotate synchronously with the power mechanism. For example, the bottom surface of the upper wheel die is provided with an upper wheel die key groove, and the top surface of the lower wheel die adjacent to the upper wheel die is provided with a lower wheel die key groove, and the upper and lower wheel dies rotate synchronously through the wheel die keys in the upper and lower wheel die key grooves. The main die support plate 201 and the wheel die are connected by keys to fix the wheel dies in the circumferential direction and prevent the wheel dies from being deflected due to collision.

[0074] The power mechanism includes a driving motor 5, a speed reducer 6 and a rotating shaft 7. The rotating shaft 7 is connected to the workbench 401 of the rack 4 through a bearing, the rotating shaft 7 is connected to the main die support plate 201, the input end of the rotating shaft 7 is connected to the output end of the speed reducer 6, and the output end of the driving motor 5 is connected to the input end of the speed reducer 6. The driving motor 5 transmits power to the speed reducer 6 to achieve speed reduction and torque increase. The lower end of the rotating shaft 7 is connected to the output end of the speed reducer 6, and as the speed reducer 6 rotates, the rotating shaft 7 drives the main die support plate 201 to rotate, thereby realizing the rotary motion of the wheel die and the main clamp die.

[0075] The wheel mold is connected with the rotating shaft 7 through a wheel mold fixing bolt 105, a wheel mold through hole through which a rod of the wheel mold fixing bolt 105 passes, and a threaded hole 701 provided on the rotating shaft 7 for mounting the wheel mold fixing bolt 105. The upper end surface of the rotating shaft 7 is provided with the threaded hole 701, the wheel mold fixing bolt 105 passes through the wheel mold through hole and is threadedly connected with the threaded hole 701 on the rotating shaft 7, so as to constrain the wheel mold and the main mold supporting plate 201 on the rotating shaft 7, axially fix the wheel mold, and drive the rotating shaft 7 to rotate to drive the wheel mold and the main mold to rotate.

[0076] The rotating shaft 7 is connected with the main mold supporting plate 201 through a key. The key connection drives the main mold supporting plate 201 to rotate through the rotating shaft 7. The flat key on the rotating shaft 7 can be appropriately higher, so that there is a gap between the main mold supporting plate 201 and the workbench 401 of the rack 4, and the friction when the main mold supporting plate 201 rotates is reduced.

[0077] The rack 4 further comprises a supporting assembly, which comprises a supporting leg plate 402 and a supporting leg cover plate 403. The workbench 401 is arranged on the top of the supporting leg plate 402, and the supporting leg cover plate 403 is arranged on the supporting leg plate 402 and is provided with a containing cavity between the supporting leg plate 402 and the supporting leg cover plate 403. The power mechanism is arranged in the containing cavity. The rack 4 supports the wheel mold assembly 1, the main mold assembly 2 and the auxiliary mold assembly 3, and increases the height of the workbench 401 for pipe bending, which facilitates the installation of the power mechanism in the rack 4 to drive the rotation of the wheel mold and the main mold.

[0078] The main mold supporting plate 201 is provided with a main mold supporting sliding groove for the movement of the main mold fixing frame 206. The auxiliary mold supporting plate 301 is provided with an auxiliary mold supporting sliding groove for the movement of the auxiliary mold pushing fixing frame 306. The movement of the main mold fixing frame 206 and the auxiliary mold pushing fixing frame 306 can be guided and limited, and the height of the main mold and the auxiliary mold can also be limited.

[0079] A pipe bending method, the steps are as follows:

[0080] 1) Place the pipe 8 in the wheel mold pipe groove 104 of the wheel mold assembly 1;

[0081] 2) quickly push the main mold feeding jacking screw 208 forward, and the main mold is preliminarily positioned with the pipe 8; quickly push the auxiliary mold feeding jacking screw 314 forward, and the auxiliary mold is preliminarily positioned with the pipe 8;

[0082] 3) press the front part of the main locking block 210, the main locking groove of the main locking block 210 is in threaded cooperation with the main clamp feeding jack screw 208, rotate the main clamp feeding jack screw 208, so that the main clamp mold continues to move forward, the main clamp mold is in cooperation with the wheel mold to clamp the pipe 8; press the front part of the auxiliary locking block 315, the auxiliary locking groove of the auxiliary locking block 315 is in threaded cooperation with the auxiliary clamp feeding jack screw 314, rotate the auxiliary clamp feeding jack screw 314, so that the auxiliary clamp mold continues to move forward, the auxiliary clamp mold is pressed to the pipe 8;

[0083] 4) drive the motor 5 to act, the rotating shaft 7 drives the main mold support plate 201 to rotate, the main clamp mold and the wheel mold clamp the pipe 8 to rotate and bend;

[0084] 5) after the pipe 8 is bent, reverse rotate the main clamp feeding jack screw 208 to loosen the main clamp mold, reverse rotate the auxiliary clamp feeding jack screw 314 to loosen the auxiliary clamp mold;

[0085] 6) press the tail part of the main locking block 210, the main locking groove of the main locking block 210 is in threaded cooperation with the main clamp feeding jack screw 208, quickly pull the main clamp feeding jack screw 208 backward; press the tail part of the auxiliary locking block 315, the auxiliary locking groove of the auxiliary locking block 315 is in threaded cooperation with the auxiliary clamp feeding jack screw 314, quickly pull the auxiliary clamp feeding jack screw 314 backward, take out the bent pipe 8;

[0086] 7) reverse drive the motor 5, drive the main clamp mold to reset, wait for the next pipe 8 to bend.

[0087] As Figure 1As shown, the wheel module assembly 1 includes three kinds of pipe 8 specifications of bending wheel mold A101, wheel mold B102, wheel mold C103, three wheel molds are arranged from top to bottom, three wheel molds are wheel mold through hole in the middle, wheel mold fixing bolt 105 through three wheel molds and the threaded hole 701 of the top of the rotating shaft 7 is connected; the contact surface between the three wheel molds is provided with a wheel mold key groove. The main clamp module assembly 2 includes main clamp mold A202, main clamp mold B203, main clamp mold C204, the main mold support plate 201 is provided with a key groove structure, and the top key of the rotating shaft 7 is connected; the working surface of the main clamp mold has a main mold pipe groove 205 corresponding to the pipe 8, and the connecting surface has a dovetail groove structure matched with the dovetail block 209 on the main mold fixing frame 206; the rod end of the main clamp feeding jacking screw 208 is rotationally connected with the main mold fixing frame 206, and a rotating hand wheel is installed at the head position. The main clamp screw fixing baffle on the main mold fixing frame 206 has a through hole in the middle, the rod end of the main clamp feeding jacking screw 208 passes through the through hole and is provided with an anti-falling limiting piece, so as to realize the rotational connection between the main clamp feeding jacking screw 208 and the main mold fixing frame 206. The auxiliary clamp module assembly 3 includes auxiliary clamp mold A302, auxiliary clamp mold B303, auxiliary clamp mold C304, the working surface of the auxiliary clamp mold has an auxiliary mold pipe groove 305, the universal ball 309 can adopt a screw universal ball, the universal ball 309 is installed on the auxiliary mold pushing fixing frame 306, and the spherical surface of the screw universal ball is in contact with the supporting surface of the auxiliary clamp mold; the rod end of the auxiliary clamp feeding jacking screw 314 is rotationally connected with the auxiliary mold pushing fixing frame 306, and a rotating hand wheel is connected at the head; the auxiliary mold pushing fixing frame 306 has an auxiliary clamp screw fixing baffle with a through hole in the middle, the auxiliary clamp feeding jacking screw 314 passes through the through hole and is provided with an anti-falling limiting piece, so as to realize the rotational connection between the auxiliary clamp feeding jacking screw 314 and the auxiliary mold pushing fixing frame 306.

[0088] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pipe bending apparatus comprising a frame (4), a wheel die assembly (1) provided on the frame (4), a main die assembly (2) for clamping a pipe (8) in cooperation with the wheel die assembly (1), and a power mechanism for driving the wheel die assembly (1) and the main die assembly (2) to rotate, characterized in that, The wheel module assembly (1) comprises at least one wheel module, the working surface of the wheel module is provided with a wheel module pipe groove (104), the wheel module pipe groove (104) comprises an arc segment pipe groove (1041) for bending a pipe (8) and a straight segment pipe groove (1042) for clamping the pipe (8); The main die assembly (2) comprises a main die support plate (201), a main die fixing frame (206) arranged on the main die support plate (201), at least one main die arranged on the main die fixing frame (206), and a main die adjusting mechanism for adjusting the position of the main die fixing frame (206), the working surface of the main die is provided with a main die pipe groove (205) matched with the straight segment pipe groove (1042), under the action of the main die adjusting mechanism, the main die approaches the wheel module and clamps the pipe (8) in cooperation with the wheel module or moves away from the wheel module to release the pipe (8) after bending, the wheel module is arranged on the main die support plate (201), and the main die support plate (201) rotates under the action of the power mechanism; The auxiliary die assembly (3) for pressing and auxiliary pushing the pipe (8) is further included, the auxiliary die assembly (3) comprises an auxiliary die support plate (301), an auxiliary die pushing fixing frame (306) arranged on the auxiliary die support plate (301), at least one auxiliary die arranged on the auxiliary die pushing fixing frame (306), and an auxiliary die adjusting mechanism for adjusting the position of the auxiliary die pushing fixing frame (306), the auxiliary die support plate (301) is arranged on the rack (4), and the working surface of the auxiliary die is provided with an auxiliary die pipe groove (305) for positioning the pipe (8); The auxiliary die is connected with the auxiliary die pushing fixing frame (306) through a follow-up mechanism, the follow-up mechanism comprises a pushing upper baffle (307), an auxiliary die fixing bolt (308) and a plurality of universal balls (309), one end of the pushing upper baffle (307) is connected with the auxiliary die pushing fixing frame (306), the other end extends to the upper side of the auxiliary die and is connected with the auxiliary die through the auxiliary die fixing bolt (308), the pushing upper baffle (307) is provided with a long hole (3071) for allowing the rod part of the auxiliary die fixing bolt (308) to move, and the plurality of universal balls (309) are arranged on the auxiliary die pushing fixing frame (306), and the spherical body of the universal ball (309) acts on the supporting surface of the auxiliary die; The main mold adjusting mechanism comprises a main mold screw fixing seat (207), a main clamp feeding jacking screw (208), and a main locking block (210) for assisting locking of the main clamp feeding jacking screw (208), the main mold screw fixing seat (207) is provided with a main screw through hole through which the main clamp feeding jacking screw (208) passes, the rod end of the main clamp feeding jacking screw (208) is rotationally connected with the main mold fixing frame (206) through the main screw through hole, the main locking block (210) is rotationally arranged on the main mold screw fixing seat (207), the main locking block (210) is provided with a main locking groove matched with the rod part of the main clamp feeding jacking screw (208), and the main locking groove is provided with a thread matched with the surface of the main clamp feeding jacking screw (208).

2. The pipe bending apparatus of claim 1, wherein The follow-up mechanism further comprises an upper positioning block (310) and a lower positioning block (311) for guiding and limiting the movement of the auxiliary clamp mold, the upper positioning block (310) is arranged on the pushing upper baffle (307), the lower positioning block (311) is arranged on the auxiliary mold pushing fixing frame (306) through a pushing lower baffle (312), and the pushing lower baffle (312) is arranged below the auxiliary clamp mold.

3. The pipe bending apparatus of claim 1, wherein The main clamp mold and the main mold fixing frame (206) are provided with a quick mold changing mechanism, the quick mold changing mechanism comprises a dovetail block (209), a locking block (211) arranged on the dovetail block (209), and a locking bolt (212), the main clamp mold is provided with a dovetail groove for positioning the dovetail block (209), the front end of the locking block (211) is threadedly connected with the dovetail block (209), the rear part of the locking block (211) is in a cylindrical structure, the main mold fixing frame (206) is provided with a circular hole (2061) for accommodating the cylindrical structure, the surface of the cylindrical structure is provided with a locking ring groove (2110), the rear wall of the locking ring groove (2110) is arranged in an inclined manner, the main mold fixing frame (206) is provided with a bolt hole for mounting the locking bolt (212), and the rod end of the locking bolt (212) acts on the locking ring groove (2110) through the bolt hole.

4. The pipe bending apparatus of claim 1 wherein, The auxiliary mold adjusting mechanism comprises an auxiliary mold screw fixing seat (313), an auxiliary clamp feeding jacking screw (314), and an auxiliary locking block (315) for assisting locking of the auxiliary clamp feeding jacking screw (314), the auxiliary mold screw fixing seat (313) is provided with an auxiliary screw through hole through which the auxiliary clamp feeding jacking screw (314) passes, the rod end of the auxiliary clamp feeding jacking screw (314) is rotationally connected with the auxiliary mold pushing fixing frame (306) through the auxiliary screw through hole, the auxiliary locking block (315) is rotationally arranged on the auxiliary mold screw fixing seat (313), the auxiliary locking block (315) is provided with an auxiliary locking groove matched with the rod part of the auxiliary clamp feeding jacking screw (314), and the auxiliary locking groove is provided with a thread matched with the surface of the auxiliary clamp feeding jacking screw (314).

5. The pipe bending apparatus of claim 1 wherein, The wheel mold is two or more, the main clamp mold and the auxiliary clamp mold are consistent with the number of the wheel mold, the adjacent wheel mold is arranged up and down along the height direction, and the two or more wheel molds are provided with the wheel mold pipe groove (104) for bending the pipe material (8) with the same pipe diameter or the pipe material (8) with different pipe diameters.

6. The pipe bending apparatus according to any one of claims 1 to 5, characterized in that, The power mechanism comprises a driving motor (5), a speed reducer (6) and a rotating shaft (7), the rotating shaft (7) is connected with the workbench (401) of the rack (4) through a bearing, the rotating shaft (7) is connected with the main mold support plate (201), the input end of the rotating shaft (7) is connected with the output end of the speed reducer (6), and the output end of the driving motor (5) is connected with the input end of the speed reducer (6).

7. The pipe bending apparatus of claim 6, wherein The wheel mold is connected with the rotating shaft (7) through a wheel mold fixing bolt (105), a wheel mold through hole is formed in the wheel mold and used for the rod part of the wheel mold fixing bolt (105) to pass through, and a threaded hole (701) is arranged on the rotating shaft (7) and used for mounting the wheel mold fixing bolt (105).

8. A method of bending a tube, characterized by, The pipe bending device is used, and the steps are as follows: 1) the pipe material (8) is placed in the wheel mold pipe groove (104) of the wheel mold assembly (1); 2) the main clamp feeding jacking screw (208) of the main mold adjusting mechanism is quickly pushed forward, the main clamp mold is preliminarily positioned with the pipe material (8) in cooperation with the wheel mold, the auxiliary clamp feeding jacking screw (314) of the auxiliary mold adjusting mechanism is quickly pushed forward, and the auxiliary clamp mold preliminarily positions the pipe material (8); 3) the front part of the main locking block (210) of the main mold adjusting mechanism is pressed down, the main locking groove of the main locking block (210) is threadedly connected with the main clamp feeding jacking screw (208), the main clamp feeding jacking screw (208) is rotated, the main clamp mold continues to move forward, the main clamp mold is clamped to the pipe material (8) in cooperation with the wheel mold, the front part of the auxiliary locking block (315) of the auxiliary mold adjusting mechanism is pressed down, the auxiliary locking groove of the auxiliary locking block (315) is threadedly connected with the auxiliary clamp feeding jacking screw (314), the auxiliary clamp feeding jacking screw (314) is rotated, the auxiliary clamp mold continues to move forward, and the auxiliary clamp mold is pressed to the pipe material (8); 4) the driving motor (5) of the power mechanism is actuated, the rotating shaft (7) of the power mechanism drives the main mold support plate (201) to rotate, the main clamp mold and the wheel mold clamp the pipe material (8) to rotate and bend; 5) after the pipe material (8) is bent, the main clamp feeding jacking screw (208) is reversely rotated to release the main clamp mold, and the auxiliary clamp feeding jacking screw (314) is reversely rotated to release the auxiliary clamp mold; 6) the tail part of the main locking block (210) is pressed down, the main locking groove of the main locking block (210) is threadedly separated from the main clamp feeding jacking screw (208), the main clamp feeding jacking screw (208) is quickly pulled back, the tail part of the auxiliary locking block (315) is pressed down, the auxiliary locking groove of the auxiliary locking block (315) is threadedly separated from the auxiliary clamp feeding jacking screw (314), the auxiliary clamp feeding jacking screw (314) is quickly pulled back, and the bent pipe material (8) is taken out; 7) The drive motor (5) is reversed to reset the main clamp mold and wait for the next pipe (8) to be bent.

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