Simple adjustable angle and pipe diameter small pipeline bending device
By designing a simple, adjustable small pipe bending device with adjustable angle and pipe diameter, the device uses a dial and bolts to adjust the angle and pipe diameter, and combines an arc plate and pulleys to achieve pipe bending. This solves the problem of inconvenient adjustment of existing equipment, improves the applicability, and reduces costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA CONSTR EIGHT ENG DIV CORP LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-06-19
AI Technical Summary
Existing small pipe bending equipment has poor adjustment capabilities, making it difficult to adapt to the needs of different pipe diameters and bending angles. It is also cumbersome to operate, costly, and lacks precision.
A simple, adjustable-angle, and adjustable-diameter small pipe bending device was designed, comprising a force-applying lever, a bending die, an angle adjustment mechanism, and a pipe diameter adjustment mechanism. The angle and pipe diameter are flexibly adjusted through a dial and bolts, and the pipe is bent by combining an arc plate and pulleys.
It achieves flexible adaptation to different pipe diameters and bending angles, is easy to operate, has a wide range of applications, reduces manufacturing costs, and is suitable for large-scale promotion and application.
Smart Images
Figure CN224372484U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe processing technology, and particularly to the field of small pipe bending technology, specifically referring to a simple small pipe bending device with adjustable angle and pipe diameter. Background Technology
[0002] Pipe processing refers to a series of processing steps performed on pipes, mainly including cutting, straightening, rounding, bending, threading, and making special-shaped pipe fittings.
[0003] Existing manual or small pipe bending equipment is mostly designed for fixed pipe diameters or single bending angles, with poor adjustability and limited applicability. When processing pipes of different diameters or bending angles, frequent mold changes or equipment structure adjustments are required, which is cumbersome and costly. In addition, angle control of traditional equipment relies on manual experience, resulting in insufficient precision and easy errors in finished products.
[0004] Therefore, it is desirable to provide a small pipe bending device that can adjust the bending angle, adapt to different pipe diameters, is easy to use, and has a wide range of applications. Utility Model Content
[0005] In order to overcome the shortcomings of the prior art, one objective of this utility model is to provide a simple, adjustable small pipe bending device with adjustable angle and pipe diameter. It can adjust the bending angle, adapt to different pipe diameters, is easy to use, has a wide range of applications, and is suitable for large-scale promotion and application.
[0006] Another objective of this utility model is to provide a simple, adjustable-angle, and adjustable-diameter small pipe bending device. It is ingeniously designed, has a simple structure, is easy to manufacture, has low manufacturing cost, and is suitable for large-scale promotion and application.
[0007] To achieve the above objectives, this utility model provides a simple, adjustable-angle, and adjustable-diameter small pipe bending device, characterized by including a force-applying lever, a bending die, an angle adjustment mechanism, a pipe diameter adjustment mechanism, a front rotating support rod, and a rear rotating support rod, wherein:
[0008] The force-applying lever is vertically arranged, and the bending mold includes an arc-shaped plate and a connecting rod. The arc-shaped plate is arranged in the front-to-back direction and extends in an arc shape from right to left and upward to the left. The lower end of the force-applying lever is located on the right end of the arc-shaped plate. The bottom surface of the arc-shaped plate is provided with an arc-shaped groove along the arc direction of the arc-shaped plate. The connecting rod is located on the left side of the lower part of the force-applying lever and the right side of the arc-shaped plate and connects the lower part of the force-applying lever and the arc-shaped plate respectively.
[0009] The angle adjustment mechanism includes a dial, an angle adjustment bolt, and a connecting bolt. The dial is vertically positioned and extends along the left-right direction, inserting into the lower part of the force-applying lever along this direction. The center of the dial is located in the lower part of the force-applying lever and coincides with the center of the circle containing the arc-shaped plate. The front and rear rotating support rods are both inclined upwards and to the right from left to right and are spaced apart from each other. The right ends of the front and rear rotating support rods are located at the front and rear of the lower part of the force-applying lever, respectively, and both abut against the lower part of the lever. The connecting bolt is positioned along the front-back direction and passes through the right end of the front rotating support rod, the lower part of the force-applying lever, the center of the dial, and the right end of the rear rotating support rod. The right end of the front rotating support rod, the lower part of the force-applying lever, the dial, and the right end of the rear rotating support rod are fixed together. A scale line is provided on the front side of the left half of the dial along the radial direction. Multiple scale lines are spaced apart along the circumference of the dial. An observation hole is provided on the front rotating support rod along the front-rear direction, located before at least one scale line. An adjustment groove is provided on the left half of the dial along the front-rear direction, extending in an arc along the circumference of the dial. An angle adjustment bolt passes through the front rotating support rod, the adjustment groove, and the rear rotating support rod along the front-rear direction, thereby fixing the front rotating support rod, the dial, and the rear rotating support rod together.
[0010] The pipe diameter adjustment mechanism includes a pulley and a pipe diameter adjustment bolt. The left ends of the front rotating support rod and the rear rotating support rod are respectively provided with a front adjustment hole and a rear adjustment hole along the front-rear direction. The front adjustment holes and the rear adjustment holes are spaced apart from each other. There are multiple front adjustment holes, which are spaced apart along the length of the front rotating support rod. The number of rear adjustment holes is the same as the number of front adjustment holes, and the rear adjustment holes correspond one-to-one with the front adjustment holes. The pipe diameter adjustment bolt is positioned along the front-rear direction and passes through one of the front adjustment holes and the corresponding rear adjustment hole, thereby connecting the left ends of the front rotating support rod and the rear rotating support rod. The pulley is vertically positioned along the left-right direction, located between the left ends of the front and rear rotating support rods and below the left side of the arc-shaped plate, and rotatably mounted on the pipe diameter adjustment bolt around the front-rear direction.
[0011] Preferably, the angle adjusting bolt is a wing bolt.
[0012] Preferably, the adjustment groove is located to the left of the scale line.
[0013] Preferably, the pipe diameter adjusting bolt is a necking bolt.
[0014] Preferably, the number of front adjustment holes is 6.
[0015] More preferably, the spacing between two adjacent front adjustment holes among the four front adjustment holes near the arc plate is less than the spacing between two adjacent front adjustment holes among the three front adjustment holes away from the arc plate.
[0016] Preferably, there are multiple connecting rods, which are arranged at intervals between each other.
[0017] More preferably, the number of connecting rods is three.
[0018] Furthermore, both the upper and lower connecting rods are inclined upwards and to the right in a left-to-right direction, with the upper connecting rod having a smaller inclination angle than the lower connecting rod, and the middle connecting rod being arranged in a left-to-right direction.
[0019] Preferably, the simple adjustable-angle and adjustable-diameter small pipe bending device further includes a left stiffening rod and a right stiffening rod. The left stiffening rod and the right stiffening rod are both inclined along the left and right directions and are arranged in a figure-eight shape with each other along the left and right directions. The left stiffening rod and the right stiffening rod are respectively located on the left and right sides of the lower end of the force-applying lever and are respectively connected to the lower end of the force-applying lever and the right end of the arc plate.
[0020] The main beneficial effects of this utility model are as follows:
[0021] 1. When using the simple adjustable angle and pipe diameter small pipe bending device of this utility model, loosen the connecting bolts and the angle adjusting bolts. Then, according to the bending angle, rotate the front and rear rotating support rods in the front-back direction. Observe the scale line through the observation hole until the desired angle is reached. Tighten the connecting bolts and the angle adjusting bolts to complete the adjustment of the bending angle. Determine the desired positions of the front and rear adjusting holes according to the pipe diameter. Loosen and remove the pipe diameter adjusting bolts. Move the pulley between the desired front and rear adjusting holes. Insert the pipe diameter adjusting bolts in the front-back direction. Position and tighten the desired front adjustment hole, pulley, and rear adjustment hole. Place the device on the ground, grasp the upper end of the force-applying lever, and rotate it to the left to make the front and rear rotating support rods vertical. Insert the pipe between the arc-shaped plate and the pulley. The arc-shaped groove of the arc-shaped plate and the groove of the pulley abut against the upper and lower walls of the pipe, respectively. Apply force to the upper end of the force-applying lever to the right. The pipe is bent by the arc-shaped plate and the pulley, achieving the purpose of bending the pipe at a set angle. Therefore, it can adjust the bending angle, adapt to different pipe diameters, is easy to use, has a wide range of applications, and is suitable for large-scale promotion and application.
[0022] 2. When using the simple adjustable angle and pipe diameter small pipe bending device of this utility model, loosen the connecting bolts and the angle adjusting bolts. Then, according to the bending angle, rotate the front and rear rotating support rods in the front-back direction. Observe the scale line through the observation hole until the desired angle is reached. Tighten the connecting bolts and the angle adjusting bolts to complete the adjustment of the bending angle. Determine the desired positions of the front and rear adjusting holes according to the pipe diameter. Loosen and remove the pipe diameter adjusting bolts. Move the pulley between the desired front and rear adjusting holes. Move the pipe diameter adjusting bolts in the front-back direction... Insert the desired front adjustment hole, pulley, and rear adjustment hole into their positions and tighten them. Place the utility model on the ground, hold the upper end of the force-applying lever and rotate it to the left, making the front and rear rotating support rods vertical. Insert the pipe between the arc-shaped plate and the pulley. The arc-shaped groove of the arc-shaped plate and the groove of the pulley abut against the upper and lower walls of the pipe, respectively. Apply force to the upper end of the force-applying lever to the right. The pipe is bent by the arc-shaped plate and the pulley, achieving the purpose of bending the pipe at a set angle. Therefore, its design is ingenious, its structure is simple, its manufacturing is convenient, its manufacturing cost is low, and it is suitable for large-scale promotion and application.
[0023] These and other objects, features and advantages of this utility model will be fully apparent from the following detailed description and drawings, and can be achieved by the means, devices and combinations thereof specifically pointed out in the description of the utility model. Attached Figure Description
[0024] Figure 1 This is a front view schematic diagram of a specific embodiment of the simple adjustable angle and diameter small pipe bending device of this utility model during use.
[0025] Figure 2 yes Figure 1 A partially enlarged schematic diagram of the structure shown. Figure 1 .
[0026] Figure 3 yes Figure 1 A partially enlarged schematic diagram of the structure shown. Figure 2 .
[0027] (Explanation of reference numerals in the attached diagram)
[0028] 1. Force-applying lever;
[0029] 2. Bending mold; 21. Arc plate; 22. Connecting rod;
[0030] 3. Angle adjustment mechanism; 31. Dial; 311. Scale line; 312. Adjustment groove; 32. Angle adjustment bolt; 33. Connecting bolt;
[0031] 4. Pipe diameter adjustment mechanism; 41. Pulley; 42. Pipe diameter adjustment bolt;
[0032] 5. Front rotating support rod; 51. Observation hole; 52. Front adjustment hole;
[0033] 6. Left stiffening rod; 7. Right stiffening rod; 8. Pipe. Detailed Implementation
[0034] In order to better understand the technical content of this utility model, the following embodiments are provided for detailed description.
[0035] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.
[0036] Please see Figures 1-3 As shown, in a specific embodiment of this utility model, the simple adjustable angle and pipe diameter small pipe bending device of this utility model includes a force-applying lever 1, a bending die 2, an angle adjustment mechanism 3, a pipe diameter adjustment mechanism 4, a front rotating support rod 5, and a rear rotating support rod (not shown in the figure), wherein:
[0037] The force-applying lever 1 is vertically arranged, and the bending mold 2 includes an arc-shaped plate 21 and a connecting rod 22. The arc-shaped plate 21 is arranged in the front-back direction and extends in an arc shape from right to left and upward to the left. The lower end of the force-applying lever 1 is located on the right end of the arc-shaped plate 21. The bottom surface of the arc-shaped plate 21 is provided with an arc-shaped groove along the arc direction of the arc-shaped plate 21. The connecting rod 22 is located on the left side of the lower part of the force-applying lever 1 and the right side of the arc-shaped plate 21 and connects the lower part of the force-applying lever 1 and the arc-shaped plate 21 respectively.
[0038] The angle adjustment mechanism 3 includes a dial 31, an angle adjustment bolt 32, and a connecting bolt 33. The dial 31 is vertically arranged and positioned along the left-right direction, and is inserted into the lower part of the force-applying lever 1 along the left-right direction. The center of the dial 31 is located in the lower part of the force-applying lever 1 and coincides with the center of the circle containing the arc plate 21. The front rotating support rod 5 and the rear rotating support rod are both inclined upwards and to the right from left to right and are spaced apart from each other. The right ends of the front rotating support rod 5 and the rear rotating support rod are located at the front and rear of the lower part of the force-applying lever 1, respectively, and both abut against the lower part of the force-applying lever 1. The connecting bolt 33 is arranged along the front-back direction and passes through the right end of the front rotating support rod 5, the lower part of the force-applying lever 1, the center of the dial 31, and the right end of the rear rotating support rod, thereby securing the right end of the front rotating support rod 5. The lower part of the force-applying lever 1, the scale 31, and the right end of the rear rotating support rod are fixed together. The front side of the left half of the scale 31 is provided with scale lines 311 along the radial direction of the scale 31. There are multiple scale lines 311, which are spaced apart from each other along the circumference of the scale 31. The front rotating support rod 5 is provided with an observation hole 51 along the front-back direction. The observation hole 51 is located in front of at least one scale line 311 (e.g., 5). The left half of the scale 31 is provided with an adjustment groove 312 along the front-back direction. The adjustment groove 312 extends arcuately along the circumference of the scale 31. The angle adjustment bolt 32 passes through the front rotating support rod 5, the adjustment groove 312, and the rear rotating support rod along the front-back direction to fix the front rotating support rod 5, the scale 31, and the rear rotating support rod together.
[0039] The pipe diameter adjustment mechanism 4 includes a pulley 41 and a pipe diameter adjustment bolt 42. The left ends of the front rotating support rod 5 and the rear rotating support rod are respectively provided with a front adjustment hole 52 and a rear adjustment hole along the front-rear direction. The front adjustment holes 52 and the rear adjustment holes are spaced apart from each other. There are multiple front adjustment holes 52, which are spaced apart along the length of the front rotating support rod 5. The number of rear adjustment holes is the same as the number of front adjustment holes 52, and the rear adjustment holes and front adjustment holes 52 are arranged in a one-to-one correspondence. The diameter adjusting bolt 42 is arranged along the front-back direction and passes through one of the front adjusting holes 52 and the corresponding rear adjusting hole along the front-back direction, thereby connecting the left end of the front rotating support rod 5 and the left end of the rear rotating support rod together. The pulley 41 is arranged vertically along the left-right direction. The pulley 41 is located between the left end of the front rotating support rod 5 and the left end of the rear rotating support rod and is located to the lower left of the arc plate 21 and is rotatably sleeved on the diameter adjusting bolt 42 around the front-back direction.
[0040] The angle adjusting bolt 32 can be any suitable bolt. In a specific embodiment of this utility model, the angle adjusting bolt 32 is a wing bolt.
[0041] The adjustment groove 312 can be located to the left or to the right of the scale line 311. Please refer to [link / reference]. Figure 2 As shown, in a specific embodiment of this utility model, the adjustment groove 312 is located to the left of the scale line 311.
[0042] The number of scale lines 311 can be determined as needed. The term "multiple" refers to two or more. In a specific embodiment of this utility model, the number of scale lines 311 is 181. The central angle between two adjacent scale lines 311 is 1°, and the central angle between the first scale line 311 and the last scale line 311 is 180°.
[0043] The pipe diameter adjusting bolt 42 can be any suitable bolt. In a specific embodiment of this utility model, the pipe diameter adjusting bolt 42 is a necking bolt.
[0044] The number of the aforementioned front adjustment holes 52 can be determined as needed; the term "multiple" refers to two or more. Please refer to [link to relevant documentation]. Figure 3 As shown, in a specific embodiment of this utility model, the number of front adjustment holes 52 is 6.
[0045] The spacing between two adjacent front adjustment holes 52 can be the same or different; please refer to [link / reference]. Figure 3As shown, in a specific embodiment of this utility model, the distance between two adjacent front adjustment holes 52 among the four front adjustment holes 52 near the arc plate 21 is less than the distance between two adjacent front adjustment holes 52 among the three front adjustment holes 52 far from the arc plate 21.
[0046] The number of connecting rods 22 can be determined as needed. Preferably, there are multiple connecting rods 22, which are arranged vertically at intervals. Please refer to [link to relevant documentation]. Figure 1 As shown, in a specific embodiment of this utility model, the number of connecting rods 22 is 3.
[0047] The three connecting rods 22 can be arranged in any suitable direction; please refer to [link / reference]. Figure 1 As shown, in a specific embodiment of this utility model, the upper connecting rod 22 and the lower connecting rod 22 are both inclined upwards and to the right in the direction from left to right. The inclination angle of the upper connecting rod 22 is smaller than that of the lower connecting rod 22, and the middle connecting rod 22 is arranged in the left-right direction.
[0048] The simple, adjustable-angle, and adjustable-diameter small pipe bending device described above may also include any other suitable components; please refer to [link / reference needed]. Figure 1 As shown, in a specific embodiment of this utility model, the simple adjustable angle and pipe diameter small pipe bending device further includes a left stiffening rod 6 and a right stiffening rod 7. The left stiffening rod 6 and the right stiffening rod 7 are both inclined along the left and right directions and are arranged in a figure-eight shape with each other along the left and right directions. The left stiffening rod 6 and the right stiffening rod 7 are respectively located on the left and right sides of the lower end of the force-applying lever 1 and are respectively connected to the lower end of the force-applying lever 1 and the right end of the arc plate 21.
[0049] In use, loosen the connecting bolt 33 and the angle adjusting bolt 32. Then, according to the bending angle, rotate the front rotating support rod 5 and the rear rotating support rod in the front-back direction. Observe the scale line 311 through the observation hole 51 until the desired angle is reached. Tighten the connecting bolt 33 and the angle adjusting bolt 32 to complete the adjustment of the bending angle. Determine the desired positions of the front adjusting hole 52 and the desired rear adjusting hole according to the pipe diameter. Loosen and remove the pipe diameter adjusting bolt 42. Move the pulley 41 between the desired front adjusting hole 52 and the desired rear adjusting hole. Insert the pipe diameter adjusting bolt 42 in the front-back direction. Set the desired front adjustment hole 52, pulley 41, and desired rear adjustment hole and tighten them. Place the utility model on the ground, hold the upper end of the force-applying lever 1 and rotate it to the left, so that the front rotating support rod 5 and the rear rotating support rod are vertical. Insert the pipe 8, which is set on the ground in the left and right direction, between the arc plate 21 and the pulley 41 in the left and right direction. The arc groove of the arc plate 21 and the groove of the pulley 41 abut against the upper and lower walls of the pipe 8, respectively. Apply force to the upper end of the force-applying lever 1 to the right, and bend the pipe 8 through the arc plate 21 and the pulley 41 to achieve the purpose of bending the pipe 8 at a set angle.
[0050] Therefore, this utility model provides a simple, adjustable small pipe bending device with adjustable angle and pipe diameter. It can be adjusted according to the bending angle and pipe diameter, and can flexibly adjust the bending angle and adapt to different pipe diameters. It can quickly meet the needs of small pipe bending with different pipe diameters and angles, with high bending efficiency. It is suitable for bending DN20-DN80 pipes at different angles, reducing the difficulties caused by non-standard pipe fittings connection, solving the problems of inconvenient adjustment and narrow applicability in the prior art, and is easy to operate, compact and flexible, easy to transport, and low in cost.
[0051] In summary, this utility model's simple, adjustable-angle, and adjustable-diameter small pipe bending device can adjust the bending angle to adapt to different pipe diameters. It is easy to use, has a wide range of applications, is ingeniously designed, has a simple structure, is easy to manufacture, and has low manufacturing costs, making it suitable for large-scale promotion and application.
[0052] Therefore, it is evident that the objective of this utility model has been fully and effectively achieved. The function and structural principles of this utility model have been demonstrated and explained in the embodiments. Without departing from the stated principles, any modifications can be made to the implementation methods. Therefore, this utility model includes all modified embodiments based on the spirit and scope of the claims.
Claims
1. A simple angle and pipe diameter adjustable small pipe bending apparatus, characterized by, It includes a force-applying lever, a bending die, an angle adjustment mechanism, a pipe diameter adjustment mechanism, a front rotating support rod, and a rear rotating support rod, wherein: The force-applying lever is vertically arranged, and the bending mold includes an arc-shaped plate and a connecting rod. The arc-shaped plate is arranged in the front-to-back direction and extends in an arc shape from right to left and upward to the left. The lower end of the force-applying lever is located on the right end of the arc-shaped plate. The bottom surface of the arc-shaped plate is provided with an arc-shaped groove along the arc direction of the arc-shaped plate. The connecting rod is located on the left side of the lower part of the force-applying lever and the right side of the arc-shaped plate and connects the lower part of the force-applying lever and the arc-shaped plate respectively. The angle adjustment mechanism includes a dial, an angle adjustment bolt, and a connecting bolt. The dial is vertically positioned and extends along the left-right direction, inserting into the lower part of the force-applying lever along this direction. The center of the dial is located in the lower part of the force-applying lever and coincides with the center of the circle containing the arc-shaped plate. The front and rear rotating support rods are both inclined upwards and to the right from left to right and are spaced apart from each other. The right ends of the front and rear rotating support rods are located at the front and rear of the lower part of the force-applying lever, respectively, and both abut against the lower part of the lever. The connecting bolt is positioned along the front-back direction and passes through the right end of the front rotating support rod, the lower part of the force-applying lever, the center of the dial, and the right end of the rear rotating support rod. The right end of the front rotating support rod, the lower part of the force-applying lever, the dial, and the right end of the rear rotating support rod are fixed together. A scale line is provided on the front side of the left half of the dial along the radial direction. Multiple scale lines are spaced apart along the circumference of the dial. An observation hole is provided on the front rotating support rod along the front-rear direction, located before at least one scale line. An adjustment groove is provided on the left half of the dial along the front-rear direction, extending in an arc along the circumference of the dial. An angle adjustment bolt passes through the front rotating support rod, the adjustment groove, and the rear rotating support rod along the front-rear direction, thereby fixing the front rotating support rod, the dial, and the rear rotating support rod together. The pipe diameter adjustment mechanism includes a pulley and a pipe diameter adjustment bolt. The left ends of the front rotating support rod and the rear rotating support rod are respectively provided with a front adjustment hole and a rear adjustment hole along the front-rear direction. The front adjustment holes and the rear adjustment holes are spaced apart from each other. There are multiple front adjustment holes, which are spaced apart along the length of the front rotating support rod. The number of rear adjustment holes is the same as the number of front adjustment holes, and the rear adjustment holes correspond one-to-one with the front adjustment holes. The pipe diameter adjustment bolt is positioned along the front-rear direction and passes through one of the front adjustment holes and the corresponding rear adjustment hole, thereby connecting the left ends of the front rotating support rod and the rear rotating support rod. The pulley is vertically positioned along the left-right direction, located between the left ends of the front and rear rotating support rods and below the left side of the arc-shaped plate, and rotatably mounted on the pipe diameter adjustment bolt around the front-rear direction.
2. The simple angle and pipe diameter adjustable small pipe bending apparatus according to claim 1, wherein The angle adjusting bolt is a wing bolt.
3. The simple angle and pipe diameter adjustable small pipe bending apparatus according to claim 1, wherein The adjustment groove is located to the left of the scale line.
4. The simple angle and pipe diameter adjustable small pipe bending apparatus according to claim 1, wherein The pipe diameter adjusting bolt is a necking bolt.
5. The simple, adjustable-angle, and adjustable-diameter small pipe bending device as described in claim 1, characterized in that, The number of front adjustment holes is 6.
6. The simple, adjustable-angle, and adjustable-diameter small pipe bending device as described in claim 5, characterized in that, The spacing between two adjacent front adjustment holes among the four front adjustment holes near the arc plate is smaller than the spacing between two adjacent front adjustment holes among the three front adjustment holes away from the arc plate.
7. The simple angle and pipe diameter adjustable small pipe bend apparatus according to claim 1, wherein The number of connecting rods is multiple, and the multiple connecting rods are arranged at intervals between each other.
8. The simple angle and pipe diameter adjustable small pipe bend apparatus according to claim 7, wherein The number of connecting rods is 3.
9. The simple angle and pipe diameter adjustable small pipe bend apparatus according to claim 8, wherein, The upper connecting rod and the lower connecting rod are both inclined upwards and to the right in a left-to-right direction. The inclination angle of the upper connecting rod is smaller than that of the lower connecting rod, and the middle connecting rod is arranged in a left-to-right direction.
10. The simple angle and pipe diameter adjustable small pipe bend apparatus according to claim 1, wherein, The simple, adjustable-angle, and adjustable-diameter small pipe bending device also includes a left stiffening rod and a right stiffening rod. The left stiffening rod and the right stiffening rod are both inclined along the left and right directions and are arranged in a figure-eight shape with each other along the left and right directions. The left stiffening rod and the right stiffening rod are respectively located on the left and right sides of the lower end of the force-applying lever and are respectively connected to the lower end of the force-applying lever and the right end of the arc plate.