C-shaped non-standard multi-curvature heat exchange tube bending device and method thereof

Abstract

The invention discloses a C-shaped non-standard multi-curvature heat exchange tube bending device and method, and relates to the technical field of heat exchange tube bending. The screw transmission seat is arranged on the rack; the gear driving system is arranged in the rack, and an inching type forward and reverse rotation switch is connected to the gear driving system; the driven pipe bending wheel and the driving pipe bending wheel are arranged on the rack. Through the driven pipe bending wheel and the two driving pipe bending wheels which are distributed triangularly and form the bending area, under the action of the screw transmission assembly, flexible adjustment of the effective radius of the bending area is achieved, limitation of single-curvature pipe bending is broken through, curvature adjustment is achieved through screw transmission, and the bending device is visual and easy to calibrate and has good application prospects. The bending process is controlled by an inching forward and reverse rotation switch, and the action is simple; and meanwhile, the device adopts a cold bending process, so that subsequent heat treatment can be avoided, and the overall production period is remarkably shortened.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger tube bending technology, specifically to a C-type non-standard multi-curvature heat exchanger tube bending device and method. Background Technology

[0002] Heat exchange tubes are the core components of a heat exchanger, housed within the shell, and used for heat exchange between two media. They possess high thermal conductivity and isothermal properties, earning them the title of heat transfer superconductors. Their thermal conductivity is thousands of times that of copper, enabling rapid heat transfer with virtually no heat loss. Common materials include carbon steel, low-alloy steel, stainless steel, and copper-nickel alloys. The most common heat exchange tube shape is C-shaped, necessitating a bending process. There are two common bending methods: First, the roundness deviation of the bent heat exchange tubes is difficult to meet the standard requirements, resulting in a low inspection pass rate. Secondly, during the bending process, it is difficult to compensate for the springback of multiple curvatures, the geometric accuracy is out of control, the tooling adaptability is poor, the batch consistency is poor, and it requires the cooperation of many people, resulting in high labor intensity and low efficiency. In addition, each type of heat exchange tube with curvature needs to design and manufacture a set of tooling. The tooling needs to be made, tested, and adjusted until it meets the size requirements of the drawings before it can be finalized for construction, making it difficult to control costs and time. Therefore, a C-type non-standard multi-curvature heat exchanger tube bending device and method are proposed. Summary of the Invention

[0003] The purpose of this invention is to provide a C-type non-standard multi-curvature heat exchanger tube bending device and method. This device, through a driven bending wheel triangularly distributed to form the bending area and two active bending wheels, under the action of a screw drive assembly, not only achieves flexible adjustment of the effective radius of the bending area, breaking the limitation of single-curvature bending, and greatly improving the equipment's versatility and production flexibility, but also the curvature adjustment is achieved through screw drive, which is intuitive and easy to calibrate. The bending process is controlled by a jog forward and reverse switch, making the operation simple. At the same time, the device adopts a cold bending process, which can eliminate the need for subsequent heat treatment and significantly shorten the overall production cycle.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a C-type non-standard multi-curvature heat exchanger tube bending device, comprising: a frame; a screw drive seat disposed on the frame; and a gear drive system internally disposed in the frame, wherein the gear drive system is connected to a jog-type forward and reverse switch; further comprising a driven bending wheel and a driven bending wheel disposed on the frame, wherein the driven bending wheel is mounted on the screw drive assembly and, under the action of the screw drive assembly, is used to adjust the distance between the driven bending wheel and the driven bending wheel to adjust the curvature radius of the tube; the number of driven bending wheels is two, placed side by side at the execution end of the gear drive system, and the two driven bending wheels and the driven bending wheel are triangularly distributed to form a bending area for the transverse insertion of the tube; under the action of the gear drive system, the reciprocating operation of the gear drive system is controlled by the jog-type forward and reverse switch, so that the tube reciprocates between the driven bending wheel and the driven bending wheel to achieve progressive bending of the tube.

[0005] Preferably, the frame includes a base and a body fixed to the top of the base, wherein the gear drive system is built into the body, and the driven bending wheel, the driving bending wheel, and the screw drive seat are assembled on the upper surface of the body.

[0006] Preferably, the screw drive seat includes a guide plate disposed on the upper surface of the machine body, the guide plate being fastened to the machine body by a first screw; and a tire bracket installed with the guide plate for limiting, the upper surface of the tire bracket being fitted with a transmission nut by a second screw; it also includes supports mounted on both sides of the upper surface of the machine body, and a transmission rod rotatably installed between the two supports for limiting, wherein the transmission rod includes a transmission screw and a guide rod fixedly connected to each other, and the transmission screw is threadedly connected to the transmission nut, and the end of the guide rod away from the transmission screw passes through the corresponding support and is fixed with a handwheel.

[0007] Preferably, the driven bending wheel includes a first deep groove ball bearing rotatably mounted on the wheel bracket, the first deep groove ball bearing being mounted with a driven wheel via a pin, the driven wheel being made of Q235B material, having a radius of 108mm and a wheel body thickness of 26mm, and its outer circle being machined into an arc-shaped concave surface; and a first spacer sleeve disposed between the first deep groove ball bearing and the wheel bracket for positioning the first deep groove ball bearing.

[0008] Preferably, each of the supports is detachably assembled to the upper surface of the machine body via a third screw, so as to replace transmission rods with different screw diameters.

[0009] Preferably, a scale is also provided on the upper surface of the machine body near the transmission screw, and the scale is horizontally distributed with the transmission screw.

[0010] Preferably, each of the active tube bending wheels includes a drive shaft longitudinally mounted on the machine body, wherein the bottom end of the drive shaft is provided with a fourth deep groove ball bearing and positioned by a fourth spacer sleeve at the bottom of the machine body, the middle part is supported by a second deep groove ball bearing and positioned by a second spacer sleeve at the top of the machine base, the upper part passes through a first through hole opened at the top of the machine body and is provided with a large end cover, and the large end cover is installed on the upper surface of the machine body by a second bolt; and an active wheel is provided at the top of the drive shaft, and the active wheel is connected to the drive shaft by a flat key and fastened by a gasket and a first bolt connected to the drive shaft. The active wheel is made of Q235B material, has a radius of 118mm, a wheel body thickness of 26mm, and an outer circle machined into an arc concave surface; and also includes a blocking plate provided at the bottom of the machine body corresponding to the position of the drive shaft.

[0011] Preferably, the gear transmission system includes transmission gears installed below each of the transmission shafts and built into the machine body; and a drive shaft longitudinally installed at the bottom of the machine body, wherein a fifth deep groove ball bearing and a fifth spacer sleeve are provided at the top end of the drive shaft and the top of the machine base, and its bottom end passes through a second through hole opened at the bottom of the machine base and a small end cap is provided at the position of the second through hole; a third deep groove ball bearing and a third spacer sleeve are provided between the small end cap and the machine base; and a drive gear is provided on the drive shaft and meshes with the two transmission gears, which is used to drive the two transmission gears to rotate synchronously and in the same direction when the drive gear rotates.

[0012] Preferably, the base is further provided with a motor and a reducer connected by a flange, wherein the input shaft of the reducer is connected to the output shaft of the motor by a coupling, the output shaft of the reducer is connected to a connecting bushing, and the end of the connecting bushing away from the reducer is connected to the bottom end of the drive shaft.

[0013] Preferably, a pipe bending method is applied to the above-mentioned C-type non-standard multi-curvature heat exchanger tube bending device: the pipe bending method includes: S1: First, manually adjust the center distance between the driven tire and the two driving tires by rotating the handwheel. As the center distance gradually decreases, the curvature of the heat exchange tube will gradually decrease. S2: Then, insert the pipe laterally into the bending area, start the motor, and control the motor to rotate forward and backward using a jog switch. The pipe will reciprocate between the driven wheel and the two driving wheels. S3: Each time the center distance is adjusted, the pipe fitting makes a reciprocating motion, and the curvature radius of the pipe fitting after bending is measured in real time. The center distance is gradually adjusted until the pipe fitting obtains the required curvature. S4: After bending is completed, turn off the motor, rotate the handwheel to adjust the center distance between the driven wheel and the driving wheel, so that the driven wheel and the driving wheel are separated by a sufficient distance, and remove the pipe from the bending area; S5: Subsequently, a quality inspection was conducted using a sample comparison measurement method to ensure that the fitting met the installation requirements of the heat exchanger.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through a triangularly distributed driven bending wheel and two active bending wheels, driven by a screw drive assembly, firstly achieves flexible adjustment of the effective radius of the bending area, breaking the limitation of single-curvature bending and enabling rapid adaptation to the bending requirements of condenser tubes with different curvatures, greatly improving the equipment's versatility and production flexibility. Secondly, curvature adjustment is achieved through screw drive, which is intuitive and easy to calibrate. The bending process is controlled by a jog-type forward and reverse switch, making the operation simple and reducing reliance on operator skills. Thirdly, the pipe performs precise guided reciprocating motion within the bending area, avoiding the problem of difficult-to-control springback in traditional one-time forming bending. Furthermore, the operator can fine-tune the process using the jog-type forward and reverse switch to gradually achieve the designed curvature, resulting in high forming accuracy. Finally, the device adopts a cold bending process, eliminating the need for additional heat treatment equipment and process costs, while shortening the overall production cycle. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a top-view schematic diagram of the working state of the present invention; Figure 4 This is a top-view schematic diagram of the standby state of the present invention; Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure of AA; Figure 6 for Figure 4 Schematic diagram of the cross-sectional structure of BB; Figure 7 for Figure 4 A schematic diagram of the cross-sectional structure of CC; Figure 8 This is a schematic diagram of the bending area formed by the active bending wheel and the driven bending wheel in this invention; Figure 9 This is a cross-sectional and top view schematic diagram of the active tire in this invention; Figure 10 This is a schematic cross-sectional view of the active tire in this invention; Figure 11 This is a schematic cross-sectional view of the driven tire in this invention; Figure 12 This is a schematic diagram of the heat exchange tubes (inner rings) with various curvature radii in this invention; Figure 13 forFigure 12 A schematic diagram of the cross-sectional structure; Figure 14 This is a schematic diagram of the heat exchange tubes (outer ring) with various curvature radii in this invention; Figure 15 for Figure 14 A schematic diagram of the cross-sectional structure.

[0016] In the diagram: 01, machine base; 02, motor; 03, reducer; 04, connecting bushing; 1. Body; 2. Guide plate; 3. Support; 5. Tire bracket; 6. Transmission nut; 7. Transmission screw; 701. Smooth rod; 8. Handwheel; 9. Large end cover; 10. Washer; 11. First bolt; 12. Second bolt; 16. Pin; 17. First spacer sleeve; 18. Drive tire; 19. Transmission shaft; 20. Second spacer sleeve; 21. Second deep groove ball bearing; 23. Blocking plate; 24. Transmission gear; 26. Drive gear; 27. Drive shaft; 28. Small end cover; 29. ​​First deep groove ball bearing; 32. First screw. Detailed Implementation

[0017] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. The various embodiments of this invention are described in detail below with reference to the accompanying drawings. Example 1

[0018] Please see Figures 1 to 14 The present invention preferably provides the following technical solution: a C-type non-standard multi-curvature heat exchanger tube bending device, comprising: a frame; a screw drive seat mounted on the frame; and a gear drive system internally mounted in the frame, wherein the gear drive system is connected to a jog-type forward and reverse switch; further comprising a driven bending wheel and a driven bending wheel mounted on the frame, wherein the driven bending wheel is mounted on the screw drive assembly and, under the action of the screw drive assembly, is used to adjust the distance between the driven bending wheel and the driven bending wheel to adjust the curvature radius of the tube 001; the number of driven bending wheels is two, placed side by side at the execution end of the gear drive system, and the two driven bending wheels and the driven bending wheel are triangularly distributed to form a bending area for the transverse insertion of the tube 001; under the action of the gear drive system, the reciprocating operation of the gear drive system is controlled by the jog-type forward and reverse switch, so that the tube 001 reciprocates between the driven bending wheel and the driven bending wheel to achieve progressive bending of the tube 001.

[0019] like Figure 3 , 4 As shown, the driven bending wheel and two active bending wheels mounted on the frame in this application are triangularly distributed to form a bending area for the lateral insertion of the pipe fitting 001. Therefore, when the pipe fitting 001 is laterally inserted into the bending area, under the action of the gear drive system, the two active bending wheels in operation can not only drive the pipe fitting 001 to move, but also control the back-and-forth operation of the gear drive system through a jog-type forward and reverse switch. This allows the pipe fitting 001 to reciprocate between the driven and active bending wheels, thereby achieving progressive bending of the pipe fitting 001. This design avoids the problems encountered in traditional one-time forming bending. Due to the difficulty in precisely controlling the rebound, the operator can fine-tune the bending process using a jog-type forward and reverse switch to gradually achieve the designed curvature, resulting in high forming accuracy. At the same time, the progressive bending reduces local stress concentration and cross-sectional distortion (such as flattening) of the tube 001, better maintaining the roundness and wall thickness uniformity of the tube 001. This is crucial for ensuring the fluid performance and pressure resistance of the heat exchange tube. On the other hand, the two active bending wheels and one driven bending wheel are triangularly distributed, which can form a stable and symmetrical clamping and guiding for the tube 001, effectively preventing lateral slippage or twisting of the tube 001 during bending and improving the bending quality. Under the action of the screw drive assembly, the center distance between the driven bending wheel and the two active bending wheels can be precisely adjusted, changing the effective radius of the bending area. This allows for the production of pipe fittings with different curvature radii on the same machine. This design is not only highly adaptable, but also particularly suitable for the production of "non-standard" and "multi-curvature" heat exchanger tubes. It eliminates the need to replace the entire set of molds for each curvature, greatly improving the equipment's versatility and production flexibility. It also reduces tooling costs and preparation time for small-batch, multi-variety orders. Moreover, the curvature adjustment is achieved through screw drive, which is intuitive and easy to calibrate. The bending process is controlled by a jog forward and reverse switch, making the operation simple and reducing reliance on operator skills. In addition, the device adopts a cold bending process, which eliminates the need for stress relief heat treatment of the heat exchange tubes after bending (except for cold work hardening materials). This advantage not only saves on additional heat treatment equipment investment and process costs, but also avoids the impact on the performance of the tubes that may be caused during the heat treatment process, and shortens the overall production cycle. It is worth noting that the inching forward and reverse switch (model DDBEFS-15A-C, rated current 15A) in this application integrates an emergency stop button, which is connected in series with the gear transmission system. During operation, the operator can control the single rotation angle of motor 02 in the gear transmission system through the inching forward and reverse switch (minimum control accuracy ≤0.5°), avoiding excessive bending of the pipe. In addition, the forward and reverse function of the inching forward and reverse switch supports fine adjustment of the pipe position during bending without disassembly and reassembly, improving the pipe bending efficiency by more than 30%.

[0020] Furthermore, the frame includes a base 01 and a body 1 fixed to the top of the base 01. A gear drive system is built into the body 1, and the driven bending wheel, the driving bending wheel, and the screw drive seat are mounted on the upper surface of the body 1. Figure 1 , 2 As shown in Figure 3. Example 2

[0021] In another embodiment of the present invention, the screw drive base includes a guide plate 2 disposed on the upper surface of the machine body 1, the guide plate 2 being fastened to the machine body 1 by a first screw 32; and a tire bracket 5 being limited and installed with the guide plate 2, the upper surface of the tire bracket 5 being fitted with a transmission nut 6 by a second screw; it also includes supports 3 mounted on both sides of the upper surface of the machine body 1, and a transmission rod being limited and rotatably installed between the two supports 3, wherein the transmission rod includes a transmission screw 7 and a guide rod 701 fixedly connected to each other, the transmission screw 7 being threadedly connected to the transmission nut 6, and the end of the guide rod 701 away from the transmission screw 7 passing through the corresponding support 3 and being fixed with a handwheel 13.

[0022] Furthermore, the driven bending wheel includes a first deep groove ball bearing 29 rotatably mounted on the wheel bracket 5, the first deep groove ball bearing 29 being mounted with a driven wheel 8 via a pin 16, the driven wheel 8 being made of Q235B material, having a radius of 108mm and a wheel body thickness of 26mm, and having its outer circle machined into an arc-shaped concave surface; and a first spacer sleeve 17 disposed between the first deep groove ball bearing 29 and the wheel bracket 5 for positioning the first deep groove ball bearing 29.

[0023] like Figure 3 , 4 As shown in Figure 5, the tire bracket 5 is limited and installed with the guide plate 2, while the driven tire 8 is assembled on the tire bracket 5. The tire bracket 5 is threadedly connected to the transmission screw 7 through the transmission nut 6. At the same time, the transmission screw 7, where the transmission rod is located, and the light rod 701 fixed to it are assembled on two supports 3. Therefore, when the handwheel 13 fixed to the light rod 701 is rotated, the transmission nut 6 can drive the tire bracket 5 to move on the guide plate 2, so as to move the driven tire 8 closer to or away from the direction of the active bending wheel, thus realizing the flexible adjustment of the effective radius of the bending area. This application uses a first deep groove ball bearing 29 as a support, which can reduce rotational resistance.

[0024] Furthermore, each support 3 is detachably assembled to the upper surface of the body 1 via a third screw, so as to replace the transmission rod with a different screw diameter, thereby adjusting the bending accuracy of the bending area. For example, it is set that for each rotation of the handwheel 13, the transmission nut 6 advances one standard unit in the direction of the active bending wheel, that is, the number of rotations of the handwheel 13 is equal to the number of times the driven wheel 8 advances. Through this single superposition of precise values, until a C-shaped heat exchange tube with the required curvature is obtained, as shown in Figures 12, 13, 14 and 15.

[0025] Furthermore, a scale 101 is also provided on the upper surface of the machine body 1 near the transmission lead screw 7, and the scale 101 is horizontally distributed with the transmission lead screw 7, such as... Figure 3 As shown, it is used to accurately and intuitively reflect the movement distance of the driven tire 8 in real time, so as to adjust the curvature of the tube 001. Example 3

[0026] In another embodiment of the present invention, each active tube bending wheel includes a drive shaft 19 longitudinally mounted on the machine body 1. The bottom end of the drive shaft 19 is provided with a fourth deep groove ball bearing and positioned by a fourth spacer sleeve. The middle part is supported by a second deep groove ball bearing 21 and positioned by a second spacer sleeve 20. The upper part passes through a first through hole opened at the top of the machine body 1 and is provided with a large end cover 9. The large end cover 9 is installed on the upper surface of the machine body 1 by a second bolt 12. An active wheel 18 is provided at the top of the drive shaft 19. The active wheel 18 is connected to the drive shaft 19 by a flat key and is fastened by a gasket 10 connected to the drive shaft 19 and a first bolt 11. The active wheel 18 is made of Q235B material, has a radius of 118mm, a wheel body thickness of 26mm, and an outer circle machined into an arc concave surface. A blocking plate 23 is also provided at the bottom of the machine body 1 corresponding to the position of the drive shaft 19.

[0027] like Figure 3 , 4 As shown in Figure 6, the drive shaft 19 is internally installed in the machine body 1. Its top end extends out of the machine body 1 and is fastened to the drive wheel 18 through the gasket 10 and the first bolt 11. Both the drive wheel 18 and the driven wheel 8 are made of Q235B material. The driven wheel 8 has a radius of 108mm and a wheel thickness of 26mm, while the drive wheel 18 has a radius of 118mm and a wheel thickness of 26mm. The outer circles of both are machined into arc-shaped concave surfaces, and the radius of the concave surface is equal to the outer diameter of the pipe + 0.05mm. The gap control accuracy is ±0.01mm. Since the outer circles of the driven wheel 8 and the two driving wheels 18 are all machined into arc-shaped concave surfaces, such as Figure 8 , 9As shown in Figures 10 and 11, the size can be combined to accommodate the bending range of small-sized heat exchange tubes. With a stable transmission system, extremely high bending efficiency is achieved—the single bending stroke of the tube with the maximum curvature only takes 10 seconds, which is a significant improvement in efficiency compared to the minutes-level time taken by manual bending. The 0.1mm gap between the concave radius of the active roller 18 and the passive roller 8 and the outer diameter of the pipe is a key feature of the pipe quality design. This design provides a stable clamping force to the pipe, ensuring that the pipe does not deviate during bending. On the other hand, it effectively avoids direct hard contact between the passive roller 8 and the active roller 18 and the pipe surface, preventing damage such as tearing and flattening, and eliminating the need for subsequent repair procedures.

[0028] Furthermore, the gear transmission system includes transmission gears 24 installed below each transmission shaft 19 and built into the body 1; and a drive shaft 27 longitudinally installed at the bottom of the body 1, with a fifth deep groove ball bearing and a fifth spacer sleeve provided at the top of the drive shaft 27 and the top of the base 01, and its bottom end passing through a second through hole opened at the bottom of the base 01 and a small end cover 28 provided at the second through hole position; a third deep groove ball bearing and a third spacer sleeve provided between the small end cover 28 and the base 01; and a drive gear 26 provided on the drive shaft 27 and meshing with the two transmission gears 24, which, when the drive gear 26 rotates, drives the two transmission gears 24 to rotate synchronously and in the same direction.

[0029] like Figure 6 , 7 As shown, each drive shaft 19 of the active pipe bending wheel is connected to a drive gear 24. The drive shaft 27, which is installed longitudinally at the bottom of the machine body 1, has a drive gear 26 that meshes with the two drive gears 24. Therefore, when the drive shaft 27 rotates, the two drive gears 24 can rotate synchronously and in the same direction, thereby realizing the same-direction rotation of the two active rollers 18 (module M3, number of teeth 31, tooth width 30mm, pressure angle second spacer 20°). Combined with the freely rotating driven roller 8 (module M3, number of teeth 47, tooth width 30mm), the transmission motion of symmetrical gears can be realized, ensuring the balance of power output on both sides of the pipe fitting 001 and avoiding pipe bending deviation caused by uneven force on one side. Furthermore, when the jog-type forward and reverse switch is running, the two transmission gears 24 move in both directions, thereby realizing the reciprocating motion of the pipe fitting 001.

[0030] Furthermore, the base 01 is also equipped with a motor 02 and a reducer 03 connected by a flange. The input shaft of the reducer 03 is connected to the output shaft of the motor 02 by a coupling. The output shaft of the reducer 03 is connected to a connecting sleeve 04, and the end of the connecting sleeve 04 away from the reducer 03 is connected to the bottom end of the drive shaft 27.

[0031] The base 01 here is welded from ordinary carbon steel materials such as angle steel, pads, and connecting plates. Its function is to provide a stable installation foundation for the various structures on it and to transmit and bear the load; the surface is coated with anti-rust primer and epoxy topcoat. The preferred motor 02 is a three-phase asynchronous motor with a power of 0.75kw and a rated speed of 1500r / min, which is suitable for small-sized heat exchange tubes (the tube diameter is usually ≤20mm). According to calculations, this power can provide an output torque of ≥5N・m to meet the plastic deformation force when the tube is bent, while avoiding energy waste caused by excessive power). The function of the reducer 03 is to reduce the speed of the motor 02, increase the torque, and change the direction of power transmission. It is preferably a worm gear reducer (model WPD0-70, reduction ratio 1:50). The input shaft is connected to the motor 02 through a flexible coupling, and the output shaft (speed = 1500r / min ÷ 50 = 30r / min) is connected to the drive shaft 27 through the connecting bushing 04. When the motor 02 and the reducer 03 are running, they can drive the drive shaft 27 to rotate. This application uses a 0.75kW motor 02 as the drive core, which completely eliminates the dependence on manual labor compared to traditional manual bending, greatly reducing the labor intensity of operators. At the same time, the power output is stable and can meet the load requirements of continuous bending of small-sized heat exchange tubes. It is also equipped with a momentary forward and reverse switch, which allows operators to flexibly control the forward and reverse rotation of motor 02 according to the bending progress, without the need to frequently start and stop the equipment to adjust the position of the tubes. This not only improves the bending efficiency but also lowers the operating threshold, making it suitable for operators of different skill levels. In addition, the motor 02 is connected to a reducer 03, which can prevent the bending forming from getting out of control due to excessive speed of motor 02, thus improving the stability of the processing. Example 4

[0032] As another embodiment of the present invention, a pipe bending method is applied to the aforementioned C-type non-standard multi-curvature heat exchanger pipe bending device: Pipe bending methods include: S1: First, manually adjust the center distance between the driven wheel 8 and the two driving wheels 18 by rotating the handwheel 13. As the center distance gradually decreases, the curvature of the heat exchange tube will gradually decrease. S2: Then, insert the pipe fitting 001 laterally into the bending area, start the motor 02, and control the motor 02 to rotate forward and reverse through the jog forward and reverse switch. The pipe fitting 001 reciprocates between the driven wheel 8 and the two driving wheels 18. S3: Each time the center distance is adjusted, the pipe fitting 001 makes a reciprocating motion, and the curvature radius of the bent pipe fitting 001 is measured in real time. The center distance is gradually adjusted until the pipe fitting 001 obtains the required curvature. S4: After bending is completed, turn off motor 02, rotate handwheel 13 to adjust the center distance between driven wheel 8 and driving wheel 18, so as to pull the driven wheel 8 and driving wheel 18 apart by a sufficient distance, and remove pipe 001 from the bending area; S5: Subsequently, a quality inspection was conducted using a sample comparison measurement method to ensure that the fitting 001 meets the installation requirements of the heat exchanger.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms “installation,” “connection,” “linking,” “fixing,” etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part. There are various ways to install detachably, such as by using a plug-in and snap-fit ​​method, or by using a bolt connection, etc.

[0034] The above embodiments, which describe the specific features of the present invention, are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above description of the invention shall fall within the scope of protection of the present invention.

Claims

1. A C-type non-standard multi-curvature heat exchanger tube bending device, characterized in that... ,include: frame; A screw drive seat is mounted on the frame; and a gear drive system is internally disposed in the frame, wherein a jog-type forward and reverse switch is connected to the gear drive system; It also includes a driven pipe bending wheel and a driven pipe bending wheel mounted on the frame, wherein the driven pipe bending wheel is mounted on a screw drive assembly and, under the action of the screw drive assembly, is used to adjust the distance between the driven pipe bending wheel and the driven pipe bending wheel in order to adjust the curvature radius of the pipe fitting (001); The number of active bending wheels is two, which are placed side by side at the execution end of the gear drive system. The two active bending wheels and the driven bending wheels are triangularly distributed to form a bending area for the pipe (001) to be inserted laterally. Under the action of the gear drive system, the back-and-forth operation of the gear drive system is controlled by a jog forward and reverse switch, so that the pipe (001) reciprocates between the driven bending wheel and the active bending wheel to achieve the progressive bending of the pipe (001).

2. The C-type non-standard multi-curvature heat exchanger tube bending device according to claim 1, characterized in that: The frame includes a base (01) and a body (1) fixed on the top of the base (01). The gear drive system is built into the body (1), and the driven bending wheel, the active bending wheel and the screw drive seat are assembled on the upper surface of the body (1).

3. The C-type non-standard multi-curvature heat exchanger tube bending device according to claim 2, characterized in that: The screw drive seat includes a guide plate (2) disposed on the upper surface of the machine body (1), and the guide plate (2) is fastened to the machine body (1) by a first screw (32); And a tire bracket (5) that is limited and installed with the guide plate (2), wherein a transmission nut (6) is assembled on the upper surface of the tire bracket (5) by a second screw. It also includes supports (3) mounted on both sides of the upper surface of the body (1), and transmission rods that are rotatably mounted between the two supports (3). The transmission rods include a transmission screw (7) and a guide rod (701) that are fixedly connected to each other. The transmission screw (7) is threadedly connected to the transmission nut (6). The end of the guide rod (701) away from the transmission screw (7) passes through the corresponding support (3) and is fixed with a handwheel (13).

4. The C-type non-standard multi-curvature heat exchanger tube bending device according to claim 3, characterized in that: The driven bending wheel includes a first deep groove ball bearing (29) rotatably mounted on the wheel bracket (5). The first deep groove ball bearing (29) is mounted with a driven wheel (8) via a pin (16). The driven wheel (8) is made of Q235B material, has a radius of 108mm, a wheel body thickness of 26mm, and its outer circle is machined into an arc concave surface. And a first spacer sleeve (17) disposed between the first deep groove ball bearing (29) and the tire bracket (5) for positioning the first deep groove ball bearing (29).

5. A C-type non-standard multi-curvature heat exchanger tube bending device according to claim 3, characterized in that: Each of the supports (3) is detachably assembled to the upper surface of the body (1) by a third screw, so as to replace the transmission rod with a different screw diameter.

6. A C-type non-standard multi-curvature heat exchanger tube bending device according to claim 3, characterized in that: The upper surface of the body (1) near the transmission screw (7) is also provided with a scale (101), and the scale (101) and the transmission screw (7) are horizontally distributed.

7. A C-type non-standard multi-curvature heat exchanger tube bending device according to claim 2, characterized in that: Each of the active tube bending wheels includes a drive shaft (19) mounted longitudinally on the machine body (1), wherein the bottom end of the drive shaft (19) is provided with a fourth deep groove ball bearing and positioned by a fourth spacer sleeve, the middle part is supported by a second deep groove ball bearing (21) and positioned by a second spacer sleeve (20), the upper part passes through a first through hole opened at the top of the machine body (1) and is provided with a large end cover (9), and the large end cover (9) is installed on the upper surface of the machine body (1) by a second bolt (12); And an active tire (18) is provided at the top of the drive shaft (19), and the active tire (18) is connected to the drive shaft (19) by a flat key and fastened with a washer (10) and a first bolt (11) connected to the drive shaft (19); The active tire (18) is made of Q235B material, with a radius of 118mm and a wheel body thickness of 26mm. The outer circle is machined into an arc-shaped concave surface. It also includes a blocking plate (23) located at the bottom of the body (1) corresponding to the position of the drive shaft (19).

8. A C-type non-standard multi-curvature heat exchanger tube bending device according to claim 7, characterized in that: The gear transmission system includes a transmission gear (24) mounted below each of the transmission shafts (19) and built into the body (1). And a drive shaft (27) is installed longitudinally at the bottom of the body (1), and the top of the drive shaft (27) and the top of the base (01) are provided with a fifth deep groove ball bearing and a fifth spacer sleeve, and the bottom end of the drive shaft (27) passes through the second through hole opened at the bottom of the base (01) and a small end cap (28) is provided at the second through hole position. A third deep groove ball bearing and a third spacer sleeve are provided between the small end cap (28) and the base (01); It also includes a drive gear (26) disposed on the drive shaft (27) and meshing with two transmission gears (24), which, when the drive gear (26) rotates, drives the two transmission gears (24) to rotate synchronously and in the same direction.

9. A C-type non-standard multi-curvature heat exchanger tube bending device according to claim 2, characterized in that: The base (01) is also provided with a motor (02) and a reducer (03) connected by a flange. The input shaft of the reducer (03) is connected to the output shaft of the motor (02) by a coupling. The output shaft of the reducer (03) is connected to a connecting bushing (04), and the end of the connecting bushing (04) away from the reducer (03) is connected to the bottom end of the drive shaft (27).

10. A pipe bending method, applied to the C-type non-standard multi-curvature heat exchanger tube bending device according to any one of claims 1-9, characterized in that: The pipe bending method includes: S1: First, manually adjust the center distance between the driven tire (8) and the two driving tires (18) by rotating the handwheel (13). As the center distance gradually decreases, the curvature of the heat exchange tube will gradually decrease. S2: Then, insert the pipe fitting (001) laterally into the bending area, start the motor (02), and control the motor (02) to rotate forward and backward by using a jog forward and reverse switch. The pipe fitting (001) reciprocates between the driven wheel (8) and the two driving wheels (18). S3: Each time the center distance is adjusted, the fitting (001) makes a reciprocating motion, and the radius of curvature of the bent fitting (001) is measured in real time. The center distance is gradually adjusted until the fitting (001) obtains the required curvature. S4: After bending is completed, turn off the motor (02), rotate the handwheel (13) to adjust the center distance between the driven wheel (8) and the driving wheel (18) so that the driven wheel (8) and the driving wheel (18) are pulled apart by a sufficient distance, and the pipe (001) is taken out from the bending area; S5: Subsequently, a quality inspection was carried out by using a sample comparison measurement method to ensure that the fitting (001) meets the installation requirements of the heat exchanger.

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