Pipe bending machine

Abstract

The invention belongs to the technical field of pipe bending machines, and particularly relates to a pipe bending machine. In order to overcome the defect that the distance between the axes of two rotating wheels needs to be adjusted when pipes with different pipe diameters are bent by an existing pipe bending machine, the pipe bending machine adopts the following technical scheme that the pipe bending machine comprises a top wheel; the machine body assembly comprises a driving device for driving the top wheels to linearly move back and forth; the cross beam is fixed on the machine body assembly; the two rotating wheels are arranged on the cross beam at intervals, rotate relative to the cross beam and are provided with shaft holes; the plane formed by the axes of the shaft holes of the two rotating wheels is perpendicular to the back-and-forth direction of the top wheel; a plurality of pipe grooves with different orientations and different pipe diameters are formed in the rotating wheel, and the distance between at least part of the pipe grooves and the axis of the shaft hole is inversely proportional to the pipe diameter of the shaft hole. The device has the beneficial effects that when the device needs to adapt to pipes with different pipe diameters, only the rotating wheels need to be rotated, the distance between the axes of the rotating wheels does not need to be adjusted, the structure is simpler, and operation is more convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe bending machines, and in particular relates to pipe bending machines. Background Art

[0002] In the field of air conditioning cold chain technology, copper tubes are often required to be bent. An existing type of pipe bending machine has a pair of rotating wheels, on which a pipe groove adapted to the pipe to be bent is provided, the pipe to be bent is placed in the pipe groove, and the top wheel is made perpendicular to the pipe to be bent to squeeze the pipe to be bent, and the pipe to be bent is bent. In order to reduce the number of beams and rotating wheels, the rotating wheel is circular or regular polygonal, and multiple pipe grooves in different directions are provided on the rotating wheel. When bending pipes of different diameters, it is necessary to adjust the distance between the two rotating wheel axes (ultimately adjust the distance between the two rotating wheel grooves), which makes the structure and operation more complicated. For this type of pipe bending machine, reference can be made to CN218744143U-a conveniently adjustable pipe bending machine, CN217018110U-a rotating wheel adjustment structure of a pipe bending machine, US5761950A, etc.

[0003] Therefore, providing a pipe bending machine that does not require adjustment of the wheel spacing and can adapt to different pipe diameters can simplify the structure and facilitate operation, which has great practical significance. Summary of the invention

[0004] The present invention aims at the disadvantage that the distance between the two rotating wheel axes needs to be adjusted when bending pipes of different diameters in the existing pipe bending machine, and provides a pipe bending machine that can adapt to different pipe diameters without adjusting the distance between the rotating wheels. The distance between the pipe grooves of the two rotating wheels can be adjusted by rotating the rotating wheel, and the distance between the two rotating wheel axes does not change. Therefore, there is no need to move the rotating wheel along the length direction of the crossbeam, and the structure is simpler and the operation is more convenient. The present invention also provides a rotating wheel for the pipe bending machine.

[0005] To achieve the above object, the present invention adopts the following technical solution: a pipe bending machine, the pipe bending machine comprising:

[0006] Crown Chakra;

[0007] The machine body assembly includes a drive device for driving the top wheel to move back and forth in a straight line;

[0008] a crossbeam fixed to the machine body assembly;

[0009] Two rotating wheels are arranged on the crossbeam at intervals and rotate relative to the crossbeam;

[0010] Wherein, the plane formed by the center lines of the two rotating wheels is perpendicular to the reciprocating direction of the top wheel;

[0011] There are a plurality of tube grooves formed on the rotating wheel, at least some of the tube grooves have different directions and tube diameters, and the distance between some or all of the tube grooves and the center line of the rotating wheel is inversely proportional to the tube diameter.

[0012] The pipe bending machine of the present invention comprises a top wheel, a machine body assembly, a crossbeam and a rotating wheel. The machine body assembly comprises a driving device for driving the top wheel to move back and forth in a straight line. The rotating wheel has an axial hole, and a plurality of pipe grooves with different directions and different pipe diameters are formed on the rotating wheel. The distance between at least some of the pipe grooves and the axis of the axial hole is inversely proportional to the pipe diameter. When it is necessary to adapt to pipes with different pipe diameters, it is only necessary to rotate the rotating wheel without adjusting the distance between the axes of the rotating wheel, and of course, there is no need to replace the crossbeam and the rotating wheel. The distance between the axis of the pipe groove and the axis of the axial hole is inversely proportional to the pipe diameter, which can be inversely proportional to all or part of them. For example, when the rotating wheel has three pipe grooves with different directions, the distances between the three pipe grooves and the axis of the axial hole can be different, or the distances between the pipe grooves with two directions and the axis of the axial hole can be the same, and the distance between the pipe groove with the third direction and the axis of the axial hole is greater than the other two. Some or all of these pipe grooves refer to some or all of the pipe grooves with different directions and different pipe diameters.

[0013] As an improvement, two, three or four tube grooves with different orientations are formed on the rotating wheel. When the orientations of the tube grooves are greater than or equal to 5, the volume of the rotating wheel will be too large or the size of the tube grooves will be too small, and too many orientations of the tube grooves will have little practical significance.

[0014] As an improvement, the pipe groove extends in a straight line.

[0015] As an improvement, the rotating wheel has a plurality of slotted surfaces with different orientations, and the tube grooves are formed on the slotted surfaces.

[0016] As an improvement, the rotating wheel is formed with four tube grooves in a first direction, a second direction, a third direction and a fourth direction.

[0017] As an improvement, the diameters of the first-direction tube groove, the second-direction tube groove, the third-direction tube groove, and the fourth-direction tube groove decrease and are distributed in sequence. The number of the first-direction tube groove and the second-direction tube groove is one, the number of the third-direction tube groove is two, and the number of the fourth-direction tube groove is three.

[0018] As an improvement, three tube grooves in the second direction, the third direction and the fourth direction are formed on the rotating wheel. The numbers of the tube grooves in the second direction, the third direction and the fourth direction increase, and the tube diameters decrease. The number of the tube grooves in the fourth direction is three.

[0019] As an improvement, a directional positioning structure is formed between the rotating wheel and the crossbeam, the positioning structure includes a positioning hole in the height direction and a positioning assembly, and the positioning assembly includes a liftable positioning member.

[0020] As an improvement, a plurality of circumferentially distributed positioning holes are provided on the rotating wheel, a positioning assembly is provided on the crossbeam, and the positioning assembly is a ball-end screw; the positioning hole is a semicircular hole; when the number of orientations of the tube groove is an odd number, the number of the positioning holes is twice the number of orientations of the tube groove.

[0021] As an improvement, the wheel assembly also includes a fixed shaft, which is fixed on the cross beam, and the wheel is provided with an axial hole, the axial hole of the wheel is loosely matched with the fixed shaft, a convex portion is formed at the lower part of the fixed shaft, a groove is formed on the lower surface of the wheel, the convex portion is located in the groove, the height of the convex portion is greater than the depth of the groove, an axial gap is provided between the wheel and the cross beam, the middle part of the fixed shaft has an intermediate small diameter section and upper and lower matching sections, the diameter of the intermediate small diameter section is smaller than the upper and lower matching sections, the upper and lower matching sections match with the wheel; an anti-slip component is provided at the upper end of the fixed shaft.

[0022] As an improvement, the top wheel of the pipe bending machine is manually driven or electrically driven.

[0023] The beneficial effects of the pipe bending machine of the present invention are: it includes a top wheel, a body assembly, a crossbeam and a rotating wheel, a plurality of pipe grooves with different directions and different pipe diameters are formed on the rotating wheel, the distance between the pipe groove and the axis of the shaft hole is inversely proportional to the pipe diameter, when it is necessary to adapt to pipes of different diameters, it is only necessary to rotate the rotating wheel without adjusting the distance between the axes of the rotating wheels, and the pipe bending is achieved through the cooperation of the two rotating wheels and the top wheel, the structure is simpler, and the operation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a pipe bending machine according to Embodiment 1 of the present invention.

[0025] Figure 2 It is a structural exploded view of the pipe bending machine according to the first embodiment of the present invention.

[0026] Figure 3 It is a schematic structural diagram of the pipe bending machine of the first embodiment of the present invention when bending a relatively large copper pipe.

[0027] Figure 4 Schematic diagram of the structure of the pipe bender of the first embodiment of the present invention when bending a small copper pipe (using the same Figure 3 different crown chakras).

[0028] Figure 5 It is a schematic structural diagram of a pipe bending machine wheel assembly according to Embodiment 1 of the present invention.

[0029] Figure 6 It is a cross-sectional view of the pipe bending machine wheel assembly according to the first embodiment of the present invention.

[0030] Figure 7It is a structural exploded view of the pipe bending machine wheel assembly of the first embodiment of the present invention.

[0031] Figure 8 It is a schematic structural diagram of a rotating wheel of a pipe bending machine according to the first embodiment of the present invention.

[0032] Fig. 9 It is a schematic structural diagram of a rotating wheel assembly of a pipe bending machine according to a second embodiment of the present invention.

[0033] Fig.10 It is a schematic structural diagram of a rotating wheel of a pipe bending machine according to a second embodiment of the present invention.

[0034] Fig.11 It is a schematic diagram of the principle of adjusting the rotating wheel of the pipe bending machine according to the second embodiment of the present invention.

[0035] Fig.12 It is a schematic structural diagram of a pipe bending machine according to Embodiment 3 of the present invention.

[0036] Fig.13 It is a schematic structural diagram of a rotating wheel assembly of a pipe bending machine according to a third embodiment of the present invention.

[0037] Fig.14 It is a schematic structural diagram of a rotating wheel of a pipe bending machine according to a third embodiment of the present invention.

[0038] In the figure, 01, body assembly; 02, top wheel; 03, rotating wheel assembly;

[0039] 1. Beam;

[0040] 2. Rotating wheel; 21. Shaft hole; 22. Pipe groove; 221. Pipe groove in the first direction; 222. Pipe groove in the second direction; 223. Pipe groove in the third direction; 224. Pipe groove in the fourth direction; 23. Positioning hole; 24. Groove; 25. Hollow groove; 26. Reinforcement rib;

[0041] 3. Fixed shaft; 31. Protrusion; 32. Middle small diameter section; 33. Upper and lower matching sections;

[0042] 4. Positioning components;

[0043] 5. Anti-drop parts;

[0044] 6. Labels;

[0045] P, copper tube;

[0046] L1, the distance between the axis of the tube groove and the axial hole in the first direction; L2, the distance between the axis of the tube groove and the axial hole in the second direction; L3, the distance between the axis of the tube groove and the axial hole in the third direction; L4, the distance between the axis of the tube groove and the axial hole in the fourth direction. DETAILED DESCRIPTION

[0047] The technical solutions of the embodiments of the present invention are explained and described below, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0048] See also Figures 1 to 8 The pipe bending machine of the first embodiment of the present invention comprises a machine body assembly 01, a top wheel 02, and a rotating wheel assembly 03. The machine body assembly comprises a manual driving device for driving the top wheel to move back and forth in a straight line. The rotating wheel assembly 03 comprises:

[0049] A beam 1;

[0050] Two rotating wheels 2 are arranged on the beam 1 at intervals, rotate relative to the beam 1, and have shaft holes 21;

[0051] A plurality of tube grooves 22 with different directions and diameters are formed on the rotating wheel 2, and the distance between at least some of the tube grooves 22 and the axis of the shaft hole 21 is inversely proportional to the diameter thereof.

[0052] In this embodiment, the left and right wheels 2 are different, the left and right wheels 2 are symmetrical, and the pipe bending machine is more beautiful as a whole. In other embodiments, the two wheels can also be the same.

[0053] In this embodiment, the pipe bender is a manual pipe bender. The improvement of this embodiment lies in the structures of the rotating wheel assembly 03, the body assembly 01 and the top wheel 02, which can refer to the drawings and the prior art.

[0054] In this embodiment, 7 / 8 and 3 / 4 copper tubes (with a smaller difference in tube diameter) can use the second orientation tube groove 222 , and there are four types of top wheels 02 .

[0055] In this embodiment, the pipe bending machine is usually arranged horizontally, and the top wheel 02 moves back and forth horizontally and linearly. The plane formed by the axes of the shaft holes 21 of the two rotating wheels 2 is vertical.

[0056] In this embodiment, the two rotating wheels 2 are symmetrically arranged.

[0057] In this embodiment, the tube groove 22 extends horizontally and linearly.

[0058] In this embodiment, the rotating wheel 2 is formed with a second direction tube groove 222, a third direction tube groove 223 and a fourth direction tube groove 224. The horizontal projection of the rotating wheel 2 is roughly 9-sided, which saves materials and is more beautiful than a hexagonal or arc surface connected slotted surface.

[0059] In this embodiment, the number of the second-direction tube groove 222, the third-direction tube groove 223, and the fourth-direction tube groove 224 increases, and the tube diameter decreases. The distances between the second-direction tube groove 222, the third-direction tube groove 223, and the fourth-direction tube groove 224 and the axis of the axial hole 21 increase, and the number of the fourth-direction tube groove 224 is three.

[0060] In this embodiment, a positioning structure is formed between the rotating wheel 2 and the crossbeam 1 , and the positioning structure includes a positioning hole 23 in the height direction and a positioning assembly 4 , and the positioning assembly 4 includes a liftable positioning member.

[0061] In this embodiment, the rotating wheel 2 is provided with a plurality of semicircular positioning holes 23 distributed in the circumferential direction, and the cross beam 1 is provided with a positioning assembly 4, and the positioning assembly 4 is a ball screw. The ball screw is composed of a spring, a steel ball, and a shell, and can be purchased from the market. The number of positioning holes 23 is consistent with the number of directions of the pipe grooves 22 and is distributed in a circumferential manner. There are three positioning holes 23.

[0062] In this embodiment, the wheel assembly also includes a fixed shaft 3, which is fixed on the crossbeam 1, and the wheel 2 is loosely matched with the fixed shaft 3. A convex portion 31 is formed at the lower part of the fixed shaft 3, and a groove 24 is formed on the lower surface of the wheel 2. The convex portion 31 is located in the groove 24, and the height of the convex portion 31 is greater than the depth of the groove 24. An axial gap is provided between the wheel 2 and the crossbeam 1, and the middle part of the fixed shaft 3 has an intermediate small diameter section 32 and upper and lower matching sections 33. The diameter of the intermediate small diameter section 32 is smaller than the upper and lower matching sections 33, and the upper and lower matching sections 33 are matched with the wheel 2; an anti-slip component 5 is provided at the upper end of the fixed shaft 3.

[0063] In this embodiment, the fixing shaft 3 and the crossbeam 1 can be fixed by threaded connection, welding, bonding, interference fit, etc.

[0064] In this embodiment, the fixing of the fixed shaft 3 and the anti-slip member 5 can be achieved by threaded connection, welding, bonding, clamping, etc. Specifically, the anti-slip member 5 is a bearing clamping ring with a cover.

[0065] In this embodiment, the pipe diameter indication numbers can be marked on the upper surface of the rotating wheel 2 .

[0066] See also Figure 3 In this embodiment, when a larger copper tube P is bent, a top wheel 02 adapted to the second direction tube groove 222 is selected, the top wheel 02 is installed on the body assembly 01, and then the second direction tube groove 222 of the rotating wheel 2 is parallel to the crossbeam 1. At this time, the copper tube P can be placed in the second direction tube groove 222, and the body assembly 01 is operated to bend the tube. Figure 3 shown.

[0067] See also Figure 4When bending a smaller copper tube P, select the top wheel 02 that matches the bottom groove in the fourth direction tube groove 224, install the top wheel 02 on the body assembly 01, and then make the fourth direction tube groove 224 of the rotating wheel 2 parallel to the crossbeam 1. At this time, the copper tube P can be placed in the bottom groove of the second direction tube groove 222, and the body assembly 01 is operated to bend the tube. Figure 4 shown.

[0068] The beneficial effects of the pipe bending machine of the first embodiment of the present invention are as follows: a plurality of pipe grooves 22 with different directions and different pipe diameters are formed on the rotating wheel 2, and the distance between the axis of at least some of the pipe grooves 22 and the axis of the shaft hole 21 is inversely proportional to the pipe diameter. When it is necessary to adapt to pipes of different diameters, it is only necessary to rotate the rotating wheel 2 without adjusting the distance between the axes of the rotating wheel 2. The adjustment structure of the rotating wheel 2 is simpler and the operation is more convenient. A positioning structure is formed between the rotating wheel 2 and the crossbeam 1, so that the rotating wheel 2 can be kept in the desired position when the copper pipe P is placed, which is convenient for placing the copper pipe P and ensuring the bending accuracy. The rotating wheel 2 adopts a hollow reinforcement structure to save materials while ensuring structural strength.

[0069] Embodiment 2

[0070] See also Figures 9 to 11 , the rotating wheel assembly of the pipe bending machine of the second embodiment of the present invention, the rotating wheel assembly comprises:

[0071] Beam 1;

[0072] The number of the rotating wheels 2 is two and they are arranged on the cross beam 1 at intervals, rotate relative to the cross beam 1, and have an axial hole 21;

[0073] A plurality of tube grooves 22 with different directions are formed on the rotating wheel 2 , and the distance between some of the tube grooves 22 and the axis of the shaft hole 21 is inversely proportional to the tube diameter.

[0074] In this embodiment, the rotating wheel 2 has four surfaces facing different directions, and a tube groove 22 is provided on the plane.

[0075] In this embodiment, the rotating wheel 2 is formed with a first-direction tube groove 221, a second-direction tube groove 222, a third-direction tube groove 223, and a fourth-direction tube groove 224. The horizontal projection of the rotating wheel 2 is roughly a dodecagon, which saves materials and is more beautiful than an octagon or a circular arc surface connecting the slotted surface.

[0076] In this embodiment, the tube diameters of the first-direction tube groove 221, the second-direction tube groove 222, the third-direction tube groove 223, and the fourth-direction tube groove 224 decrease gradually. The number of the first-direction tube groove 221 and the second-direction tube groove 222 is one, the number of the third-direction tube groove 223 is two, and the number of the fourth-direction tube groove 224 is three.

[0077] In this embodiment, the tube diameters of the two third-direction tube grooves 223 are different, and the tube diameters of the three fourth-direction tube grooves 224 are different.

[0078] In this embodiment, a positioning structure is formed between the rotating wheel 2 and the cross beam 1, and the positioning structure includes positioning holes 23 in the height direction and a positioning assembly 4, and the positioning assembly 4 includes a lifting and lowering positioning member. There are four positioning holes 23.

[0079] In this embodiment, there are four types of top wheels 02, which are respectively adapted to four pipe grooves 22 with different orientations.

[0080] See also Fig. 9 In this embodiment, the distance L1 between the first-direction tube groove 221 and the axis of the shaft hole 21 is equal to the distance L2 between the second-direction tube groove 222 and the axis of the shaft hole 21. The distance L3 between the third-direction tube groove 223 and the axis of the shaft hole 21 is greater than the distance L1 between the first-direction tube groove 221 and the axis of the shaft hole 21, and the distance L4 between the fourth-direction tube groove 224 and the axis of the shaft hole 21 is greater than the distance L3 between the third-direction tube groove 223 and the axis of the shaft hole 21. In this embodiment, L1=L2<L3<L4. In other embodiments, the distance L1 between the first-direction tube groove 221 and the axis of the shaft hole 21 may also be less than the distance L2 between the second-direction tube groove 222 and the axis of the shaft hole 21, that is, L1<L2<L3<L4.

[0081] The working principle of the pipe bending machine of this embodiment is: firstly, the direction of the rotating wheel 2 is adjusted to adapt to the copper pipes P of different diameters: Assuming the initial state is as follows Fig.11 As shown in the figure above, the first tube groove 221 with the largest tube diameter faces the direction of the top wheel 02 (the line connecting the first tube grooves 221 of the two rotating wheels 2 is perpendicular to the movement direction of the top wheel 02), and the positioning component 4 fixes the direction of the rotating wheel 2. At this time, the copper tube P with the largest tube diameter can be bent; when the copper tube P with the smallest tube diameter needs to be bent, the elastic force of the positioning component 4 is overcome to rotate the rotating wheel 2. After the rotating wheel 2 rotates 90°, the fourth tube groove 224 with the smallest tube diameter faces the direction of the top wheel 02 (the line connecting the fourth tube grooves 224 of the two rotating wheels 2 is perpendicular to the movement direction of the top wheel 02), and the positioning component 4 fixes the direction of the rotating wheel 2 again, and the rotating wheel assembly of the pipe bending machine changes to Fig.11 Before bending the pipe, place the copper pipe P of the corresponding diameter in the corresponding fourth direction pipe groove 224, and then make the corresponding top wheel 02 move perpendicular to the crossbeam 1. When the copper pipe P contacts the rotating wheel 2, since the force from the top wheel 02 is much greater than the elastic force of the positioning component 4 and the rotating wheel 2 is connected with the fixed shaft 3, the rotating wheel 2 will rotate around the fixed shaft 3. When the top wheel 02 moves the required stroke, the copper pipe P is bent into the required angle.

[0082] Embodiment 3

[0083] See also Figure 12 to Figure 14 The pipe bending machine of the third embodiment of the present invention is different from the pipe bending machine of the first embodiment in that the rotating wheel 2 is provided.

[0084] In this embodiment, the rotating wheel 2 is a plastic rotating wheel 2, and the rotating wheel 2 is further provided with a hollow groove 25, and a reinforcing rib 26 is formed in the hollow groove 25. The hollow groove 25 and the reinforcing rib 26 are distributed in multiple parts of the rotating wheel 2. Some of the hollow grooves 25 are opened at positions corresponding to the third-direction tube groove 223 and the fourth-direction tube groove 224. When observed from above, a hollow groove 25 is opened at the location of the third-direction tube groove 223 and the fourth-direction tube groove 224, and a straight reinforcing rib 26 is formed in the hollow groove 25 at the third-direction tube groove 223, and a cross-shaped reinforcing rib 26 is formed in the hollow groove 25 at the fourth-direction tube groove 224. When observed from below, a hollow groove 25 is opened at the location of the third-direction tube groove 223 and the fourth-direction tube groove 224, and a straight reinforcing rib 26 is formed in the hollow groove 25 at the third-direction tube groove 223 and the fourth-direction tube groove 224. The second oriented pipe groove 222 does not need to be hollowed out because it is close to the shaft hole 21. When viewed from below, part of the hollowed-out groove 25 is opened in the central area of ​​the wheel 2, and the hollowed-out groove 25 there is annular, and the reinforcing ribs 26 there are distributed circumferentially and radiate radially.

[0085] In this embodiment, the rotating wheel 2 has six circumferentially evenly distributed positioning holes 23, so that when the rotating wheel assembly 03 is installed on the body assembly 01, there is no need to distinguish the direction. When only three circumferentially evenly distributed positioning holes 23 are provided on the rotating wheel 2, it is necessary to install it in a specific direction of one of the left and right directions, otherwise the rotating wheel 2 cannot be positioned circumferentially.

[0086] In this embodiment, a label slot is formed on the upper surface of the rotating wheel 2, and a label 6 such as a nameplate is attached to the label slot. The label 6 makes the rotating wheel 2 more beautiful and can also prevent dust and debris from entering the hollow slot 25.

[0087] In other embodiments, the rotating wheel may also be made of other materials such as aluminum.

[0088] The above is only a specific implementation of the invention, but the protection scope of the invention is not limited thereto. Those skilled in the art should understand that the invention includes but is not limited to the contents described in the above specific implementation. Any modification that does not deviate from the functional and structural principles of the invention will be included in the scope of the claims.

Claims

1. Pipe bending machine, characterized by: The pipe bending machine comprises: Crown Chakra (02); The machine body assembly (01) includes a driving device for driving the top wheel (02) to move back and forth in a straight line; A crossbeam (1) fixed on the machine body assembly (01); Two rotating wheels (2) are arranged on the crossbeam (1) at an interval and rotate relative to the crossbeam (1); Wherein, the plane formed by the center lines of the two rotating wheels (2) is perpendicular to the reciprocating direction of the top wheel (02); A plurality of tube grooves (22) are formed on the rotating wheel (2), at least some of the tube grooves (22) have different orientations and tube diameters, and the distance between some or all of the tube grooves (22) and the center line of the rotating wheel (2) is inversely proportional to the tube diameter.

2. The pipe bending machine according to claim 1, characterized in that: Two, three or four tube grooves (22) with different orientations are formed on the rotating wheel (2).

3. The pipe bending machine according to claim 1, characterized in that: The tube groove (22) extends in a straight line; the rotating wheel (2) has a plurality of slotted surfaces with different orientations, and the tube groove (22) is formed on the slotted surfaces; the rotating wheel (2) also has a hollow groove (25), and a reinforcing rib (26) is formed in the hollow groove (25).

4. The pipe bending machine according to claim 1, characterized in that: The rotating wheel (2) is formed with a first-direction tube groove (221), a second-direction tube groove (222), a third-direction tube groove (223) and a fourth-direction tube groove (224); the tube diameters of the first-direction tube groove (221), the second-direction tube groove (222), the third-direction tube groove (223) and the fourth-direction tube groove (224) decrease gradually and are distributed in sequence.

5. The pipe bending machine according to claim 4, characterized in that: The number of the first-direction tube groove (221) and the second-direction tube groove (222) is one, the number of the third-direction tube groove (223) is two, and the number of the fourth-direction tube groove (224) is three.

6. The pipe bending machine according to claim 1, characterized in that: The rotating wheel (2) is formed with a second-direction tube groove (222), a third-direction tube groove (223) and a fourth-direction tube groove (224); the number of the second-direction tube groove (222), the third-direction tube groove (223) and the fourth-direction tube groove (224) increases gradually, and the tube diameter decreases gradually; the distances between the second-direction tube groove (222), the third-direction tube groove (223) and the fourth-direction tube groove (224) and the center line of the rotating wheel (2) increase gradually; and the number of the fourth-direction tube groove (224) is three.

7. The pipe bending machine according to claim 1, characterized in that: A directional positioning structure is formed between the rotating wheel (2) and the crossbeam (1), wherein the positioning structure comprises a positioning hole (23) in the height direction and a positioning assembly (4), wherein the positioning assembly (4) comprises a lifting and lowering positioning member.

8. The pipe bending machine according to claim 7, characterized in that: The rotating wheel (2) is provided with a plurality of circumferentially distributed positioning holes (23); the crossbeam (1) is provided with a positioning assembly (4), and the positioning assembly (4) is a ball screw; the positioning holes (23) are semicircular holes; when the number of orientations of the tube groove (22) is an odd number, the number of the positioning holes (23) is twice the number of orientations of the tube groove (22).

9. The pipe bending machine according to claim 1, characterized in that: The pipe bending machine also includes a fixed shaft (3), the fixed shaft (3) is fixed on the cross beam (1), the rotating wheel (2) is provided with an axial hole (21), the axial hole (21) of the rotating wheel (2) and the fixed shaft (3) are clearance-matched, a convex portion (31) is formed at the lower part of the fixed shaft (3), a groove (24) is formed on the lower surface of the rotating wheel (2), the convex portion (31) is located in the groove (24), the height of the convex portion (31) is greater than the depth of the groove (24), an axial gap is provided between the rotating wheel (2) and the cross beam (1), the middle part of the fixed shaft (3) is provided with a middle small diameter section (32) and upper and lower matching sections (33), the diameter of the middle small diameter section (32) is smaller than that of the upper and lower matching sections (33), and the upper and lower matching sections (33) are matched with the rotating wheel (2); and an anti-slip component (5) is provided at the upper end of the fixed shaft (3).

10. The pipe bending machine according to claim 1, characterized in that: The top wheel (02) of the pipe bending machine is manually driven or electrically driven.

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