Small U-shaped pipe bending machine without waste materials

Abstract

The utility model provides a waste-free small U-shaped pipe bender, which relates to the technical field of pipe processing equipment, and comprises a mounting plate and a profiling assembly, and the profiling assembly comprises a bearing table for placing a pipe; a pipe bending device is arranged on one side of the profiling assembly, a front core inserting device is arranged on the pipe bending device, a material pushing device is arranged on the other side of the profiling assembly, a pipe bending mold is arranged on the side, close to the material pushing device, of the pipe bending device, and a bending forming groove is formed in the pipe bending mold; the pushing device is used for pushing the pipe on the bearing table forwards to the bending forming groove, and the front end of the pipe is arranged on the front core inserting device in a penetrating and sleeving mode to be bent. According to the pipe bending machine, in the pipe bending process, the bearing table keeps making contact with a pipe all the time, the first servo driving lead screw module drives the bearing table to move backwards, and then sliding friction is formed between the bearing table and the pipe; the pipe orifice is recycled under the action of sliding friction, the problem that a traditional pipe orifice is inclined or is too large in inclined opening is solved, the machining quality of the pipe is improved, and the technological requirement is met.

Description

Technical Field

[0001] This utility model relates to the field of pipe processing equipment technology, and in particular to a small U-bending machine that produces no waste. Background Technology

[0002] Pipe bending machines, as key equipment in metal pipe processing, are widely used in many engineering and manufacturing fields, such as pipeline and pipe fitting fabrication. Their working principle involves placing the metal pipe inside a bending die and applying pressure to cause plastic deformation, thereby bending the pipe to meet diverse needs in different fields.

[0003] Chinese patent CN116140482A discloses a short pipe bending processing device. This device mainly consists of a worktable, a pipe bending processing mechanism mounted on the worktable, and a pipe flaring and shaping mechanism. The pipe bending processing mechanism includes a bending assembly, a positioning groove on one side of the bending assembly, and a pusher rod located on the side of the positioning groove away from the bending assembly. The pusher rod is axially movable; when the pipe is placed in the positioning groove, the pusher rod pushes the pipe to the bending assembly for bending processing.

[0004] However, an excessively small bending radius during pipe bending can lead to a series of problems. Specifically, before bending, the pipe needs to undergo internal mandrel bending. During mandrel bending, the burrs produced during the chipless cutting process need to be smoothed to ensure successful mandrel bending in the subsequent process. Simultaneously, the stretching of the material during bending increases the tensile stress on the outer wall, causing excessive thinning of the outer wall and resulting in uneven stress at the pipe end, leading to a beveled cut. Furthermore, existing technologies lack effective solutions to address the problems caused by an excessively small bending radius during pipe bending, such as increased tensile stress on the outer wall, excessive thinning of the outer wall, and uneven stress at the pipe end leading to a beveled cut. With the continuous development of the manufacturing industry, higher demands are placed on the performance and processing precision of pipe bending machines. For example, in some high-end manufacturing fields, such as aerospace and precision machinery, the bending precision requirements for pipe fittings are extremely high; even minor errors can affect the performance and quality of the entire product. Therefore, developing pipe bending machine technology that can effectively solve various problems during pipe bending, especially those caused by an excessively small bending radius, is of significant practical importance.

[0005] The aforementioned patented devices do not include any mechanism to address this critical issue, meaning that the existing technology still has defects that need to be improved. Utility Model Content

[0006] This invention overcomes the shortcomings of the prior art and provides a waste-free small U-bending pipe machine, which solves the problem of traditional pipe openings having bevels or excessively large bevels, improves the processing quality of pipes, and meets process requirements.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] A waste-free small U-shaped pipe bending machine includes a mounting plate, on which a template assembly is provided. The template assembly includes a support platform for placing pipes, and the support platform is connected to a first servo drive screw module. A pipe bending device is provided on one side of the template assembly, and a front insert device is provided on the pipe bending device. A pusher device is provided on the other side of the template assembly. A pipe bending mold is provided on the side of the pipe bending device near the pusher device, and a bending forming groove is provided on the pipe bending mold.

[0009] The pushing device is used to push the tube on the support platform forward to the bending forming groove, and let the front end of the tube pass through the front insert device. Then the bending device rotates to bend the tube. At the same time, the support platform moves backward under the action of the first servo drive screw module to form sliding friction with the tube.

[0010] Furthermore, the pipe bending device includes a main body, a pipe bending mold is set on the main body, a pressure block is set below the pipe bending mold, the pressure block is connected to a hydraulic cylinder, the hydraulic cylinder controls the pressure block to rise so as to press the pipe tightly; the two ends of the main body are connected to rotating arms, the upper end of the rotating arms is rotatably connected to the support; the upper end of one rotating arm is connected to a rotating mechanism for driving the main body to rotate, thereby realizing the pipe bending operation.

[0011] Furthermore, the front insert device includes a fixing plate, which is fixedly connected to the main board body; a first slide is slidably connected to the main board body, and a second slide is slidably connected to the first slide, with the front insert being disposed on the second slide.

[0012] Furthermore, the pushing device includes a main frame connected to the mounting plate, a first movable frame slidably mounted on the main frame, a rear insert core mounted on the first movable frame, the rear insert core being used to push the tube on the support platform towards the front insert core device and insert it into the rear end of the tube, the front insert core device being inserted into the front end of the tube; a second servo drive screw module is mounted on the main frame, the second servo drive screw module being connected to the first movable frame and controlling the movement of the first movable frame; a second movable frame is slidably mounted on the main frame, the second movable frame being equipped with a pushing rod, a third servo drive screw module is mounted on the main frame, the third servo drive screw module being connected to the second movable frame and controlling the movement of the second movable frame, the rear insert core being slidably sleeved on the second movable frame.

[0013] Furthermore, the surface of the support platform is formed with a groove, and a hardened treatment layer is provided on the surface of the support platform.

[0014] Furthermore, it includes a main unit with an inclined mounting surface, on which a mounting plate is fixed; a guide feed pipe, a straightening mechanism, a pipe feeding mechanism, and a chipless cutting mechanism are sequentially connected along the processing steps on the main unit; the pipe feeding mechanism includes a moving module and a fixed module that cooperate with each other to complete the feeding; the straightening mechanism includes a horizontal straightening roller group and a vertical straightening roller group arranged orthogonally.

[0015] Furthermore, the chipless cutting mechanism includes a main shaft, a bushing rotatably fitted on the main shaft, and a cutter disc fixed to the front end of the bushing. The cutter disc is provided with a first support bearing and a second support bearing. A slider is radially slidably arranged on the cutter disc, and a cutting blade is connected to the slider. The tube is located at the junction of the first support bearing, the second support bearing, and the cutting blade. It also includes a push sleeve, which is slidably fitted on the bushing and driven by a cylinder to move axially along the bushing. The slider is provided with an inclined surface, and the slider cooperates with the push sleeve on the inclined surface to achieve radial feed. A pulley sleeve is provided on the bushing, which is connected to a belt, and the belt is connected to a rotary cutting motor.

[0016] Furthermore, an axial insert-type shaping assembly is also provided next to the chipless cutting mechanism. The axial insert-type shaping assembly is connected to the fourth servo drive screw module. The axial insert-type shaping assembly includes an insert mechanism and a fifth servo drive screw module connected to it. The insert mechanism is provided with a push rod that matches the inner diameter of the tube. The fifth servo drive screw module can drive the push rod to shape the tube opening after cutting. A clearance groove is provided on the circumference of the push rod. It also includes a vertical plate with a limit sleeve. The push rod is movably sleeved on the limit sleeve, and the inner diameter of the limit sleeve is smaller than the outer diameter of the tube. When the push rod is driven back by the fifth servo drive screw module, the tube section cut is forcibly separated from the push rod by the limit sleeve.

[0017] Furthermore, the main unit is equipped with a three-axis motion clamping robot for clamping and conveying the cut pipes to the template assembly.

[0018] Furthermore, the main unit is equipped with a receiving platform, which is located below the pipe bending device.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] In this invention, the bending operation of the pipe is achieved through the coordinated action of the template assembly, the pushing device, the bending device, and the front inserting device. During the bending process, the support platform remains in contact with the pipe, and the first servo drive screw module drives the support platform to move backward, thereby forming sliding friction with the pipe. Under the action of this sliding friction, the pipe end is retracted, which solves the problem of the traditional pipe end having a bevel or an excessively large bevel, improves the processing quality of the pipe, and meets the process requirements. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and, together with the embodiments of the present invention, are used to explain the present invention. They do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a 3D view of a waste-free small U-shaped pipe bending machine;

[0023] Figure 2 This is a side view of a waste-free small U-shaped pipe bending machine;

[0024] Figure 3 This is a schematic diagram of the mold assembly, the tube bending device, the front insert device, and the material pushing device.

[0025] Figure 4 This is a schematic diagram showing the material pusher separated from the mounting plate;

[0026] Figure 5 This is a schematic diagram of the bottom structure of the mounting plate;

[0027] Figure 6 This is a side view of the feeding device;

[0028] Figure 7 It is a 3D view of the front insert device and the bending device in a separated state;

[0029] Figure 8 This is a side view of the front insert assembly;

[0030] Figure 9 It is a three-dimensional chipless cutting mechanism and an axial insert-type shaping assembly. Figure 1 ;

[0031] Figure 10 It is a three-dimensional chipless cutting mechanism and an axial insert-type shaping assembly. Figure 2 ;

[0032] Figure 11 This is a 3D diagram of a chipless cutting mechanism;

[0033] Figure 12 This is an exploded view of a chipless cutting mechanism;

[0034] Figure 13 This is a cross-sectional view of the chipless cutting mechanism;

[0035] Figure 14 yes Figure 13 Enlarged view of the circled area A in the middle;

[0036] Figure 15 This is a diagram showing the positional relationship between the pipe and the push rod.

[0037] In the picture:

[0038] 1. Mounting plate; 2. Template assembly; 201. Support platform; 2011. Pipe groove; 3. First servo drive screw module; 4. Pipe bending device; 401. Main body; 402. Pressure block; 403. Hydraulic cylinder; 404. Rotating arm; 405. Support; 406. Rotating mechanism; 5. Front insert device; 501. Fixing plate; 502. First slide; 503. Second slide; 504. Front insert; 6. Push Material feeding device; 601, main frame; 602, rear insert; 603, second servo drive screw module; 604, first moving frame; 605, second moving frame; 606, push rod; 607, third servo drive screw module; 7, pipe bending mold; 701, bending forming groove; 8, main machine platform; 801, inclined mounting surface; 802, receiving platform; 9, guide feed pipe; 10, straightening mechanism; 1001. 1002. Horizontal straightening roller assembly; 11. Vertical straightening roller assembly; 11. Pipe feeding mechanism; 1101. Moving mold assembly; 1102. Fixed mold assembly; 12. Chipless cutting mechanism; 1201. Main shaft; 1202. Bushing; 1203. Cutter head; 1204. First support bearing; 1205. Second support bearing; 1206. Slider; 12061. Inclined surface; 1207. Cutting blade; 1208. Pusher 1209. Pulley sleeve; 1210. Belt; 1211. Rotary cutting motor; 1212. Cylinder; 13. Clamping robot; 14. Axial insert-type forming assembly; 1401. Insert mechanism; 1402. Fifth servo drive screw module; 1403. Top rod; 14031. Alternating groove; 1404. Vertical plate; 1405. Limit sleeve; 15. Fourth servo drive screw module; 16. Pipe. Detailed Implementation

[0039] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0040] like Figures 1 to 15 As shown, this utility model claims protection for a waste-free small U-shaped pipe bending machine, including a mounting plate 1, on which a template assembly 2 is provided. The template assembly 2 includes a support platform 201 for placing pipes. The cut pipes are placed on the support platform 201 to await the pipe bending process. This small U-shaped pipe bending machine also includes a main unit 8, which is provided with an inclined mounting surface 801. The mounting plate 1 is fixed on the inclined mounting surface 801. Figure 1 as well as Figure 2 As can be seen, the processing components of the entire small U-shaped pipe bending machine are set at an angle, which facilitates the pushing and dropping of the bent U-shaped pipe for collection.

[0041] The main unit 8 is sequentially connected along the processing steps: a guide feed pipe 9, a straightening mechanism 10, a pipe feeding mechanism 11, and a chipless cutting mechanism 12. The straightening mechanism 10 includes orthogonally arranged horizontal straightening roller group 1001 and vertical straightening roller group 1002. After the pipe enters from the guide feed pipe 9, it is straightened under the action of the horizontal straightening roller group 1001 and the vertical straightening roller group 1002. The pipe feeding mechanism 11 includes a moving mold group 1101 and a fixed mold that cooperate with each other to complete the feeding. Group 1102 and moving module 1101 are slidably arranged along the conveying direction of the pipe. Both moving module 1101 and fixed module 1102 are equipped with corresponding hydraulic cylinders for pressing. When the hydraulic cylinder of fixed module 1102 is released, the hydraulic cylinder of moving module 1101 presses the pipe and conveys it forward. When the hydraulic cylinder of moving module 1101 releases the pressure on the pipe and moves back, the hydraulic cylinder of fixed module 1102 presses the pipe to fix it. The pipe is continuously conveyed forward in this manner. Moving module 1101 can be a lead screw module driven by a servo motor that moves back and forth and is cut into the required pipe segments under the action of chipless cutting mechanism 12.

[0042] The chipless cutting mechanism 12 includes a main shaft 1201 and a bushing 1202 rotatably mounted on the main shaft 1201. The bushing 1202 is rotatably connected to the main shaft 1201 via bearings. The front end of the bushing 1202 is fixed to the cutter head 1203 by bolts. A pulley sleeve 1209 is provided on the bushing 1202. The pulley sleeve 1209 is connected to a belt 1210. The belt 1210 is connected to a rotary cutting motor 1211. That is, when the rotary cutting motor 1211 is started, the bushing 1202 and the cutter head 1203 are finally driven to rotate through the belt 1210 and the pulley sleeve 1209. The cutter head 1203 is equipped with a first support bearing 1204 and a second support bearing 1205. A slider 1206 is radially slidably mounted on the cutter head 1203, and a cutting blade 1207 is connected to the slider 1206. The tube is located within the enclosure of the first support bearing 1204, the second support bearing 1205, and the cutting blade 1207. The first support bearing 1204 and the second support bearing 1205 provide support for the tube. The cutter head 1203 also includes a push sleeve 1208, which is slidably fitted onto a bushing 1202 and driven by a cylinder 1212 to move axially along the bushing 1202. Block 1206 is provided with an inclined surface 12061. The slider 1206 cooperates with the push sleeve 1208 on the inclined surface 12061 to achieve radial feed. As can be seen from the above structural description, the rotary cutting motor 1211 drives the cutter head 1203 to rotate, which ultimately causes the cutting blade 1207, the first support bearing 1204, and the second support bearing 1205 to rotate around the pipe. Combined with the cylinder, the push sleeve 1208 is pushed forward. The push sleeve 1208 and the inclined surface 12061 act to cause the slider 1206 to feed radially, that is, to cause the cutting blade 1207 to move towards the pipe, thus completing the cutting of the pipe.

[0043] Next to the chipless cutting mechanism 12, an axial insert-type shaping assembly 14 is also provided, which is connected to the fourth servo drive screw module 15. The axial insert-type shaping assembly 14 includes an insert mechanism 1401 and a fifth servo drive screw module 1402 connected thereto. The insert mechanism 1401 is provided with a push rod 1403 that fits with the inner diameter of the tube. The fifth servo drive screw module 1402 can drive the push rod 1403 to shape the tube end after cutting. During the cutting process, the fifth servo drive screw module 1402 drives the push rod 1403 as follows: Figure 13 As shown, the push rod 1403 inserted into the pipe 9 has a relief groove 14031 on its circumference. At this time, the relief groove 14031 corresponds to the cutting blade 1207. Therefore, when the cutting blade 1207 cuts the pipe 9 deeply, it corresponds to the relief groove 14031 and will not damage the push rod 1403.

[0044] After cutting, the pipe segment remaining on the spindle 1201 has a certain degree of narrowing. At this time, the fourth servo drive screw module 15 drives the push rod 1403 forward a small distance, causing the front end of the push rod 1403 to impact the end of the pipe segment remaining on the spindle 1201 to make it round. Then, the fifth servo drive screw module 1402 independently controls the push rod 1403 to retract (at this time, the cut pipe segment is sleeved on the push rod 1403). It also includes a vertical plate 1404, which is provided with a limit sleeve 1405. The push rod 1403 is movably sleeved on the limit sleeve 1405, and the inner diameter of the limit sleeve 1405 is smaller than the outer diameter of the pipe 9. Therefore, when the push rod 1403 is driven to retract by the fifth servo drive screw module 1402, the cut pipe segment is blocked by the limit sleeve 1405 and forcibly separated from the push rod 1403.

[0045] The main unit 8 is equipped with a three-axis motion clamping robot 13. The clamping robot 13 is a clamping cylinder that can achieve three-dimensional XYZ motion by installing multiple cylinders / hydraulic cylinders or lead screw modules on the gantry. That is, it can perform lifting, lowering, left and right, forward and backward movements. Before clamping, the clamping robot 13 is located in front of the limit sleeve 1405. It is used to clamp the pipe when it is separated from the push rod 1403, thereby clamping and transporting the cut pipe to the template assembly 2 to wait for bending.

[0046] The support platform 201 is connected to the first servo drive screw module 3; a pipe bending device 4 is provided on one side of the template assembly 2, and a front insert device 5 is provided on the pipe bending device 4; a pushing device 6 is provided on the other side of the template assembly 2; a pipe bending mold 7 is provided on the side of the pipe bending device 4 near the pushing device 6, and a bending forming groove 701 is provided on the pipe bending mold 7; the pushing device 6 includes a main frame 601 connected to the mounting plate 1; a first movable frame 604 is slidably provided on the main frame 601; a rear insert 602 is provided on the first movable frame 604; the rear insert 602 is used to push the pipe on the support platform 201 toward the front insert device 5 and insert it into the rear end of the pipe; a second servo drive screw module 603 is provided on the main frame 601; the second servo drive screw module 603 is connected to the first movable frame 604 and controls the movement of the first movable frame 604. A second movable frame 605 is slidably mounted on the main frame 601. A pusher rod 606 is mounted on the second movable frame 605. The pusher rod 606 is used to push the bent tube out of the bending die 7. The pusher rod 606 corresponds to the upper end of the bent U-shaped tube. A third servo drive screw module 607 is mounted on the main frame 601. The third servo drive screw module 607 is connected to the second movable frame 605 and controls the movement of the second movable frame 605. The rear insert 602 is slidably sleeved on the second movable frame 605. Therefore, the movement between the second movable frame 605 and the rear insert 602 does not affect each other.

[0047] The pipe bending device 4 includes a main body 401, a pipe bending mold 7 mounted on the main body 401, and a pressure block 402 positioned below the pipe bending mold 7. The pressure block 402 corresponds vertically to the pipe bending mold 7 and is connected to a hydraulic cylinder 403. The hydraulic cylinder 403 controls the pressure block 402 to rise, thereby pressing the pipe between the pressure block 402 and the pipe bending mold 7. By pressing the pipe before bending, the stability of the bending is enhanced. Two rotating arms 404 are connected to both ends of the main body 401, and the upper ends of the rotating arms 404 are rotatably connected to a support 405. A rotating mechanism 406 is connected to the upper end of one rotating arm 404. In this embodiment, the rotating mechanism 406 consists of a servo motor and a reducer connected to it. The output end of the reducer is connected to the rotating arm 404 to drive the main body 401 to rotate, thereby realizing the pipe bending operation.

[0048] The front insert device 5 includes a fixing plate 501, which is fixedly connected to the main body 401. A first slide 502 is slidably connected to the main body 401. A hydraulic cylinder is provided on the main body 401 to control the lifting and lowering of the first slide 502. A second slide 503 is slidably connected to the first slide 502. A hydraulic cylinder is also provided on the first slide 502 to control the movement of the second slide 503, thereby controlling the front insert 504 on the second slide 503 to be inserted into the front end of the pipe to be bent.

[0049] The working principle of this utility model is as follows: the position of the front insert 504 is controlled by the front insert device 5 so that the front insert 504 is aligned with the front end of the tube. Then, the rear insert 602 in the pushing device 6 pushes the tube on the support platform 201 forward to the bending forming groove 701, and the front end of the tube is fitted onto the front insert 504 of the front insert device 5. That is, the rear insert 602 and the front insert 504 are respectively inserted into the two ends of the tube. In this embodiment, the rear insert 602 and the front insert 504 are in contact at this time. This provides support to the inner wall of the entire pipe. Then, the hydraulic cylinder 403 controls the pressure block 402 to rise, pressing the pipe firmly between the pressure block 402 and the bending die 7. Next, the bending device 4 rotates (along with the front insert device 5) to bend the pipe. As the bending device 4 rotates, the support platform 201 moves backward under the action of the first servo drive screw module 3 to create sliding friction with the pipe. This sliding friction causes the pipe opening to be retracted, solving the problem of traditional pipe openings having an oblique or excessively large oblique angle. In this embodiment, a pipe groove 2011 is formed on the surface of the support platform 201, and the pipe is placed in the pipe groove 2011 for processing. A hardened treatment layer is provided on the surface of the support platform 201 to enhance wear resistance.

[0050] After the pipe is bent, the front insert 504 of the control front insert device 5 is pulled out of the pipe and removed, and the push rod 606 pushes out and pushes the bent pipe down; the main unit 8 is equipped with a receiving platform 802, which is located below the pipe bending device 4, so the pushed-down pipe falls directly into the receiving platform 802 for collection, which is very convenient.

[0051] In this invention, the bending operation of the pipe is achieved through the coordinated action of the template assembly 2, the pusher device 6, the pipe bending device 4, and the front insert device 5. During the bending process, the support platform 201 always maintains contact with the pipe. The first servo drive screw module 3 drives the support platform 201 to move backward, thereby forming sliding friction with the pipe. Under the action of this sliding friction, the pipe end is retracted, which solves the problem of the traditional pipe end having a bevel or an excessively large bevel, improves the processing quality of the pipe, and meets the process requirements.

[0052] The aforementioned servo-driven lead screw modules are all lead screw modules driven by servo motors. Taking the connection between the support platform 201 and the first servo-driven lead screw module 3 as an example, the first servo-driven lead screw module 3 includes a servo motor, a lead screw, and a lead screw nut. The support platform 201 is connected to the lead screw nut, which is threaded onto the lead screw. The lead screw is connected to the servo motor. Therefore, according to the working principle of the lead screw module, the servo motor ultimately drives the support platform 201 to move. The structural principles of the other second servo-driven lead screw modules 603, third servo-driven lead screw modules 607, fourth servo-driven lead screw modules 15, and fifth servo-driven lead screw modules 1402 are similar to those described above and will not be elaborated here. By using servo motor drive, the accuracy and stability of the motion can be improved.

[0053] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A no scrap small U-bend tube machine characterized by: The utility model provides a pipe bending device, including mounting plate (1), be provided with the die assembly (2) on mounting plate (1), and the die assembly (2) includes the bearing platform (201) for placing pipe material, and the bearing platform (201) is connected with first servo drive screw rod module (3), one side of die assembly (2) is provided with pipe bending device (4), and the front plug core device (5) is provided on pipe bending device (4), and the other side of die assembly (2) is provided with pusher device (6), and the bending die (7) is provided on the side of pipe bending device (4) close to pusher device (6), and the bending die (7) is provided with bending forming groove (701). The pusher device (6) is used to push the pipe material on the bearing platform (201) to the bending forming groove (701) and make the front end of the pipe material pass through the front plug core device (5), and then the pipe bending device (4) is rotated to realize the bending of the pipe material; at the same time, the bearing platform (201) is moved backward under the action of the first servo drive screw rod module (3) to form sliding friction with the pipe material.

2. The no scrap small U-bend tube bender of claim 1, wherein: The pipe bending device (4) includes a main plate body (401), the bending die (7) is arranged on the main plate body (401), a pressing block (402) is arranged below the bending die (7), the pressing block (402) is connected with an oil cylinder (403), the oil cylinder (403) controls the pressing block (402) to rise so as to press the pipe material tightly, both ends of the main plate body (401) are connected with rotating arms (404), the upper ends of the rotating arms (404) are rotatably connected to a support (405), the upper end of one of the rotating arms (404) is connected with a rotating mechanism (406) for driving the main plate body (401) to rotate and realizing the bending operation of the pipe material.

3. The no scrap small U-bend tube machine according to claim 2, characterized in that: The front plug core device (5) includes a fixed plate (501) fixedly connected to the main plate body (401), a first sliding frame (502) is slidably connected to the main plate body (401), a second sliding frame (503) is transversely slidably connected to the first sliding frame (502), and a front plug core (504) is arranged on the second sliding frame (503).

4. The no scrap small U-bend tube bender of claim 1, wherein: The pusher device (6) includes a main frame body (601) connected to the mounting plate (1), a first moving frame (604) is slidably arranged on the main frame body (601), a rear plug core (602) is arranged on the first moving frame (604), the rear plug core (602) is used to push the pipe material on the bearing platform (201) to the front plug core device (5) and insert into the rear end of the pipe material, a second servo drive screw rod module (603) is arranged on the main frame body (601), the second servo drive screw rod module (603) is connected with the first moving frame (604) to control the movement of the first moving frame (604), a second moving frame (605) is slidably arranged on the main frame body (601), a pusher rod (606) is arranged on the second moving frame (605), a third servo drive screw rod module (607) is arranged on the main frame body (601), the third servo drive screw rod module (607) is connected with the second moving frame (605) to control the movement of the second moving frame (605), and the rear plug core (602) is slidably arranged on the second moving frame (605).

5. The no scrap small U-bend tube bender of claim 1, wherein: The surface of the bearing table (201) is formed with a pipe groove (2011), and the surface of the bearing table (201) is provided with a hardening treatment layer.

6. The no scrap small U-bend tube bender of claim 1, wherein: The main machine table (8) is provided with an inclined installation surface (801), and the installation plate (1) is fixed on the inclined installation surface (801); the main machine table (8) is sequentially provided with a guide feeding pipe (9), a straightening mechanism (10), a pipe feeding mechanism (11), and a chipless cutting mechanism (12) along the machining process; the pipe feeding mechanism (11) comprises a movable die set (1101) and a fixed die set (1102) which cooperate with each other to complete feeding; and the straightening mechanism (10) comprises a horizontal correction roller group (1001) and a vertical correction roller group (1002) which are arranged orthogonally.

7. The no scrap, small U-bend tube bender of claim 6 wherein: The chipless cutting mechanism (12) comprises a main shaft (1201), a shaft sleeve (1202) rotatably sleeved on the main shaft (1201), and a cutter head (1203) fixed to the front end of the shaft sleeve (1202); the cutter head (1203) is arranged with a first supporting bearing (1204) and a second supporting bearing (1205); the cutter head (1203) is radially slidably provided with a sliding block (1206); a cutting knife (1207) is connected to the sliding block (1206); the pipe is located in the surrounding of the first supporting bearing (1204), the second supporting bearing (1205), and the cutting knife (1207); the chipless cutting mechanism (12) further comprises a pushing sleeve (1208) which is slidably sleeved on the shaft sleeve (1202) and is driven by a gas cylinder (1212) to move axially along the shaft sleeve (1202); the sliding block (1206) is provided with an inclined surface (12061); the sliding block (1206) is radially fed by cooperating with the pushing sleeve (1208) on the inclined surface (12061); the shaft sleeve (1202) is provided with a belt wheel sleeve (1209); the belt wheel sleeve (1209) is connected with a belt (1210); and the belt (1210) is connected with a rotary cutting motor (1211).

8. The no scrap small U-bend tube bender of claim 7, wherein: The chipless cutting mechanism (12) is further provided with an axial plug core type shaping assembly (14) connected with a fourth servo driven screw rod module (15); the axial plug core type shaping assembly (14) comprises a plug core mechanism (1401) and a fifth servo driven screw rod module (1402) connected therewith; the plug core mechanism (1401) is provided with a jack (1403) matched with the inner diameter of the pipe; the fifth servo driven screw rod module (1402) can drive the jack (1403) to perform shaping on the pipe opening of the pipe after cutting is completed; the jack (1403) is circumferentially provided with an avoiding groove (14031); the axial plug core type shaping assembly (14) further comprises a vertical plate (1404) provided with a limiting sleeve (1405); the jack (1403) is movably sleeved on the limiting sleeve (1405); the inner hole diameter of the limiting sleeve (1405) is smaller than the outer diameter of the pipe; and when the jack (1403) is driven to retreat by the fifth servo driven screw rod module (1402), the pipe of the cutting section is blocked by the limiting sleeve (1405) and the jack (1403) to achieve forced separation.

9. The no scrap, small U-bend tube bender of claim 8, wherein: The main machine table (8) is provided with a three-axis motion clamping manipulator (13) for clamping and conveying the cut pipe to the die assembly (2).

10. The no scrap small U-bend tube machine of claim 9, wherein: The main machine table (8) is provided with a material collecting table (802), and the material collecting table (802) is located below the pipe bending device (4).

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