Novel three-station electric heating tube spiral bending machine

Abstract

The invention relates to the technical field of pipe bending machines, and provides a novel three-station electric heating pipe spiral pipe bending machine which comprises a first supporting seat, a second supporting seat and a third supporting seat which are arranged in parallel, and adjusting blocks are slidably mounted on the first supporting seat, the second supporting seat and the third supporting seat correspondingly. The first supporting seat, the second supporting seat and the third supporting seat are all in threaded connection with first screws, a first pressing wheel is rotationally installed on the adjusting block, a rotating shaft is rotationally installed on the adjusting block, and the rotating shaft is connected with the first screws. A first motor, a second motor and a third motor are installed on the back face of the first supporting base, the back face of the second supporting base and the back face of the third supporting base respectively, and an output shaft of the first motor is connected with the first pressing wheel. By means of the technical scheme, the problems that an existing pipe bending machine cannot produce electric heating pipes of spiral structures with different screw pitches and does not have the auxiliary guiding function are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe bending machines, and in particular to a novel three-station electric heating pipe spiral bending machine. Background Art

[0002] Electric heating tubes are widely used in home appliances, electric water heaters, industrial heating, and automotive battery heating. Their core principle is to convert electrical energy into heat through a resistance wire, transferring the heat to the desired medium through a pipe, thereby achieving heating. To ensure effective heating and a long-lasting pipe life, electric heating tubes require the use of a pipe bending machine during production, but existing pipe bending machines have several drawbacks.

[0003] The invention patent with publication number CN109570289A discloses an automatic electric heating tube bending machine. The feeding module includes a funnel vibration mechanism and a control feeding mechanism. The funnel vibration mechanism includes a linear channel for the electric heating tube, a through-type photoelectric switch, a feeding funnel and an electric push rod. The control feeding mechanism includes a cylinder and a sliding loader; the positioning module includes a lever centering mechanism, and the lever centering mechanism includes a cylinder and a lever centerer; the grasping module includes a horizontal moving mechanism, a longitudinal moving mechanism and a pneumatic grasping mechanism. The horizontal moving mechanism includes a screw slide and a grasping module main frame, and the longitudinal moving mechanism includes a dual-axis cylinder and a grasping module sub-frame; the bending module includes a pipe clamping mechanism and a pipe bending mechanism; the unloading module includes a pipe hanging mechanism. It can improve work efficiency, improve the working environment, reduce labor input, save production costs, and effectively improve the qualified rate of M-type electric heating pipe products. Although the above-mentioned device can produce M-type pipe fittings, it cannot produce spiral structure electric heating pipes with different pitches when used, and its applicability is insufficient. In addition, the existing pipe bending machine does not have a multi-station production function and cannot provide auxiliary guidance when feeding. Summary of the Invention

[0004] The present invention proposes a novel three-station electric heating tube spiral bending machine, which solves the problems that existing bending machines cannot produce electric heating tubes with spiral structures of different pitches and do not have an auxiliary guiding function.

[0005] The technical solutions of the present invention are as follows: The cam is connected with the first supporting plate and the second supporting plate, and the cam is connected with the first supporting plate and the second supporting plate by the screw thread, and the cam is connected with the first supporting plate and the second supporting plate by the screw thread.

[0006] As a preferred solution of the present invention, the first support seat, the second support seat and the third support seat have the same structure but different lengths, the first support seat, the second support seat and the third support seat are all provided with a sliding groove for the adjustment block to slide, and the first support seat, the second support seat and the third support seat are all installed with a support assembly.

[0007] As a preferred solution of the present invention, a connecting ring is fixedly provided on the first screw rod, and a connecting rod is provided inside the connecting ring. The distance between each group of the first pressure wheel, the second pressure wheel and the third pressure wheel and the first support seat, the second support seat and the third support seat decreases from left to right.

[0008] As a preferred solution of the present invention, the guide assembly includes a first key cylinder fixedly connected to the first pressure wheel, the second pressure wheel and the third pressure wheel, the first key cylinder has a key connected to a first key rod, the first key rod has a fourth pressure wheel fixedly connected, the fourth pressure wheel has a second key cylinder fixedly provided, the second key cylinder has a key connected to a second key rod, and the second key rod has a fifth pressure wheel fixedly provided.

[0009] As a preferred solution of the present invention, the fourth pressure wheel, the fifth pressure wheel, the first pressure wheel, the second pressure wheel and the third pressure wheel have the same size and structure, and the fourth pressure wheel and the fifth pressure wheel form a synchronous rotation structure with the first pressure wheel through the second key rod and the second key cylinder.

[0010] As a preferred solution of the present invention, the connecting assembly includes a connecting sleeve fixedly connected to the second key rod, a connecting ring is installed on the outer side of the connecting sleeve, the connecting ring and the connecting sleeve are rotatably connected, and a fixing plate is welded to the bottom of the connecting ring.

[0011] As a preferred solution of the present invention, the support assembly includes an electric push rod installed on the first support seat, the second support seat and the third support seat, a turntable is rotatably installed on the electric push rod, and balls are rotatably installed on the turntable, and the balls are evenly distributed on the turntable.

[0012] As a preferred solution of the present invention, the second pressing wheel and the third pressing wheel are symmetrically distributed on both sides of the first pressing wheel, and the first pressing wheel forms a lifting structure between the adjusting block, the first screw and the third support seat.

[0013] As a preferred solution of the present invention, the pitch adjustment assembly includes a fourth motor installed on the first support seat, the second support seat and the third support seat, the output shaft of the fourth motor is fixedly connected to the second screw, the outer thread of the second screw is installed with a slide, the first rotating plate is rotatably installed above the slide, the second rotating plate is rotatably installed on the first rotating plate, and a connecting plate is fixedly provided on the bottom of the fixed plate, the connecting plate below the fifth pressure wheel is rotatably connected to the first rotating plate and the fixed plate, and the second rotating plate is rotatably connected to the connecting plate below the fourth pressure wheel.

[0014] As a preferred solution of the present invention, a clamping rod is provided through the second rotating plate, and fixed blocks are fixedly provided on the first support seat, the second support seat and the third support seat, and the clamping rod passes through the fixed blocks.

[0015] The working principle and beneficial effects of the present invention are: 1. The function of adjusting the pitch of the pipe bend is realized by setting the pitch adjustment component, the first pressing wheel, the second pressing wheel and the third pressing wheel. The second screw is driven to rotate by the fourth motor, which drives the slide to move, thereby rotating the first rotating plate and the second rotating plate. At this time, the two adjacent rows of pressing wheels can be driven to move equidistantly while the position of the clamping rod remains unchanged, thereby changing the guide position of the device, so that the device can produce spiral electric heating tubes with different pitches, enhancing the adaptability of the device, and solving the problem that the existing pipe bending device cannot produce spiral structure electric heating tubes with different pitches.

[0016] 2. Three support bases of different lengths are arranged in parallel on the device, and the horizontal spacing between each support base and the first row of pressing wheels on the support base is different. Therefore, the steel pipe can be passed through the support plate and the support plate can be used to guide the three steel pipes during feeding. With the three sets of pressing wheels, the device can provide auxiliary guidance during continuous feeding, thereby processing multiple steel pipes simultaneously and improving the production efficiency of the device.

[0017] 3. The device is provided with a clamping rod and a fixing block. The clamping rod can be removed from the fixing block later, thereby removing the pitch adjustment assembly from the device as a whole. At this time, the electric push rod on the support assembly can be extended or shortened, and the ball bearing on the turntable can be used to push the steel pipe to achieve the guiding function after the shorter steel pipe is fed, so that the shorter steel pipe can be discharged faster after bending, thereby enhancing the convenience of using the device.

[0018] 4. The device is provided with a connecting ring and a connecting rod. By installing the connecting rod into the inside of the connecting ring, it is ensured that the first screw on each support seat can remain fixed after rotating the same number of circles. At the same time, it can ensure that each support seat is aligned so that multiple spiral steel pipes can be processed at the same time, ensuring the stability of the device during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the overall structure of a new three-station electric heating tube spiral bending machine of the present invention; Figure 2 yes Figure 1 A magnified schematic diagram of the structure at center A; Figure 3 This is a schematic diagram of the overall structure of the third support base of the present invention; Figure 4 This is a schematic diagram of the connection structure between the third support seat and the second pressure wheel of the present invention; Figure 5 This is a schematic diagram of the connection structure between the third support base and the support assembly of the present invention; Figure 6 yes Figure 5 A magnified schematic diagram of the structure at B in the middle; Figure 7 This is a schematic diagram of the connection structure between the first pressure wheel and the first key cylinder of the present invention; Figure 8 yes Figure 7 A magnified schematic diagram of the structure at C in the middle; Figure 9 This is a schematic diagram of the bottom structure of the pitch adjustment assembly of the present invention; Figure 10 This is a schematic diagram of the connection structure between the third support base and the fixed block of the present invention; Figure 11 It is a schematic diagram of the connection structure between the second screw and the slide plate of the present invention.

[0021] Reference numerals: 1, first support base; 2, second support base; 3, third support base; 4, adjusting block; 5, first pressure roller; 6, first screw rod; 7, connecting ring; 8, connecting rod; 9, guide assembly; 901, first key cylinder; 902, first key rod; 903, fourth pressure roller; 904, second key cylinder; 905, second key rod; 906, fifth pressure roller; 10, slide groove; 11, connecting assembly; 1101, connecting sleeve; 1102, connecting ring; 1103, fixing plate; 12, support plate; 13. Metal tube; 14. Rotating shaft; 15. First motor; 16. Support assembly; 1601. Electric push rod; 1602. Turntable; 1603. Ball bearing; 17. Second pressure roller; 18. Third pressure roller; 19. Second motor; 20. Third motor; 21. Pitch adjustment assembly; 2101. Fourth motor; 2102. Second screw; 2103. Slide plate; 2104. First rotating plate; 2105. Second rotating plate; 2106. Connecting plate; 2107. Clamping rod; 2108. Fixing block. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention. Example 1

[0023] like Figures 1-11As shown, this embodiment proposes a novel three-station electric heating tube spiral bending machine, including a first support base 1, a second support base 2 and a third support base 3 arranged in parallel, the first support base 1, the second support base 2 and the third support base 3 are all slidably installed with an adjusting block 4, the first support base 1, the second support base 2 and the third support base 3 are all threadedly connected with a first screw 6, a first pressing wheel 5 is rotatably installed on the adjusting block 4, a rotating shaft 14 is rotatably installed on the adjusting block 4, the rotating shaft 14 is connected to the first screw 6, and the initial height of the rotating shaft 14 and the adjusting block 4 is changed by rotating the first screw 6. The degree of bending of the steel pipe is changed by changing the height of the first pressing wheel 5. The first supporting seat 1, the second supporting seat 2 and the third supporting seat 3 are all equipped with a first motor 15, a second motor 19 and a third motor 20 on the back side. The output shaft of the first motor 15 is connected to the first pressing wheel 5. The output shaft of the second motor 19 is fixedly connected to the second pressing wheel 17. The output shaft of the third motor 20 is fixedly connected to the third pressing wheel 18. The first pressing wheel 5, the second pressing wheel 17 and the third pressing wheel 18 are all equipped with a guide assembly 9. The guide assembly 9 is provided with a connecting assembly 11. Figure 3 As shown, the guide assembly 9 and the connecting assembly 11 enable the steel pipe to be guided multiple times, thereby ensuring the production quality of the steel pipe. A pitch adjustment assembly 21 is provided below the connecting assembly 11, and a support plate 12 is installed on the first support seat 1. A metal tube 13 is provided through the support plate 12. The first motor 15, the second motor 19 and the third motor 20 are respectively used to drive the first pressing wheel 5, the second pressing wheel 17 and the third pressing wheel 18 to rotate, thereby driving the guide assemblies 9 at the three positions to work synchronously, so that the spiral structure of the electric heating pipe can be accurately guided to improve the production quality of the spiral steel pipe. The pitch between the two adjacent rows of pressing wheels is changed by the pitch adjustment assembly 21, and the two adjacent rows of pressing wheels can be kept equidistant during adjustment, thereby changing the pitch of the spiral electric heating pipe produced by the device. Example 2

[0024] like Figures 1-11 As shown, based on the same concept as the above-mentioned embodiment 1, this embodiment also proposes a new three-station electric heating tube spiral bending machine.

[0025] In this embodiment, the first support base 1, the second support base 2 and the third support base 3 have the same structure but different lengths. The first support base 1, the second support base 2 and the third support base 3 are all provided with a slide groove 10 for the adjustment block 4 to slide, so as to ensure that the adjustment block 4 moves vertically up and down (combined with Figure 2 As shown), the first support seat 1, the second support seat 2 and the third support seat 3 are each equipped with a support assembly 16, which can change the degree of bending when the steel pipe is fed, thereby realizing an auxiliary guiding function.

[0026] In this embodiment, a connecting ring 7 is fixedly provided on the first screw 6, and a connecting rod 8 is provided in the connecting ring 7. The distances between each group of the first pressing wheel 5, the second pressing wheel 17 and the third pressing wheel 18 and the first support seat 1, the second support seat 2 and the third support seat 3 decrease from left to right, as shown in FIG. Figure 1 As shown, the distances between each group of the first pressing wheel 5, the second pressing wheel 17 and the third pressing wheel 18 and the corresponding support seat are different. Therefore, multiple steel pipes can be processed at the same time, thereby improving the processing efficiency of the device.

[0027] In this embodiment, the guide assembly 9 includes a first key cylinder 901 fixedly connected to the first pressure wheel 5, the second pressure wheel 17 and the third pressure wheel 18, the first key cylinder 901 is keyed with a first key rod 902, the first key rod 902 is fixedly connected to the fourth pressure wheel 903, the fourth pressure wheel 903 is fixedly provided with a second key cylinder 904, the second key cylinder 904 is keyed with a second key rod 905, and the second key rod 905 is fixedly provided with a fifth pressure wheel 906. When the first pressure wheel 5, the second pressure wheel 17 and the third pressure wheel 18 rotate, the fourth pressure wheel 903 and the fifth pressure wheel 906 keyed on the first pressure wheel 5, the second pressure wheel 17 and the third pressure wheel 18 will rotate synchronously, thereby utilizing multiple groups of pressure wheels to guide the spirally bent steel pipe.

[0028] In this embodiment, the sizes and structures of the fourth pressing wheel 903, the fifth pressing wheel 906, the first pressing wheel 5, the second pressing wheel 17 and the third pressing wheel 18 are all the same. The fourth pressing wheel 903 and the fifth pressing wheel 906 form a synchronous rotation structure with the first pressing wheel 5 through the second key rod 905 and the second key cylinder 904. Through the synchronous rotation structure on the device, the bent steel pipe can continue to move forward in a spiral trajectory, thereby ensuring the production quality of the device.

[0029] In this embodiment, the connecting assembly 11 includes a connecting sleeve 1101 fixedly connected to the second key rod 905, and a connecting ring 1102 is installed on the outer side of the connecting sleeve 1101. The connecting ring 1102 and the connecting sleeve 1101 are rotatably connected. A fixing plate 1103 is welded to the bottom of the connecting ring 1102. The second key rod 905 will rotate on the connecting ring 1102 through the connecting sleeve 1101. The fixing plate 1103 is used to support the connecting ring 1102 and each group of pressure wheels to facilitate subsequent adjustment of the pitch of the spiral bending.

[0030] In this embodiment, the support assembly 16 includes an electric push rod 1601 installed on the first support seat 1, the second support seat 2 and the third support seat 3. A turntable 1602 is rotatably installed on the electric push rod 1601, and a ball 1603 is rotatably installed on the turntable 1602. The ball 1603 is evenly distributed on the turntable 1602. After the steel pipe passes through the first set of pressure wheels, the electric push rod 1601 can be extended so that the ball 1603 on the turntable 1602 abuts against the steel pipe, allowing the steel pipe to move along a spiral trajectory.

[0031] In this embodiment, the second pressing wheel 17 and the third pressing wheel 18 are symmetrically distributed on both sides of the first pressing wheel 5. The first pressing wheel 5 forms a lifting structure with the third support seat 3 through the adjusting block 4 and the first screw 6. When the first screw 6 rotates, it will drive the adjusting block 4 to move up and down on the corresponding support seat, changing the pressing effect of the first pressing wheel 5, thereby changing the radius of the steel pipe during spiral movement.

[0032] In this embodiment, the pitch adjustment assembly 21 includes a fourth motor 2101 installed on the first support base 1, the second support base 2 and the third support base 3, the output shaft of the fourth motor 2101 is fixedly connected to the second screw 2102, the outer thread of the second screw 2102 is threadedly installed with a slide 2103, the upper part of the slide 2103 is rotatably installed with a first rotating plate 2104, the first rotating plate 2104 is rotatably installed with a second rotating plate 2105, the bottom of the fixed plate 1103 is fixedly provided with a connecting plate 2106, and the connecting plate 2106 below the fifth pressure wheel 906 is fixedly provided with a connecting plate 2107. 6 is rotationally connected to the first rotating plate 2104 and the fixed plate 1103, and the second rotating plate 2105 is rotationally connected to the connecting plate 2106 below the fourth pressure wheel 903. The second screw 2102 is driven to rotate by the fourth motor 2101, driving the slide plate 2103 to slide in the corresponding support seat. At this time, the slide plate 2103 drives the connecting plate 2106 to move, and the first rotating plate 2104 and the second rotating plate 2105 rotate in opposite directions, thereby changing the distance between the two adjacent connecting plates 2106 to facilitate the subsequent adjustment of the steel pipe bending pitch.

[0033] In this embodiment, a clamping rod 2107 is provided through the second rotating plate 2105, and a fixed block 2108 is fixedly provided on the first support seat 1, the second support seat 2 and the third support seat 3. The clamping rod 2107 passes through the fixed block 2108, and the position of one end of the second rotating plate 2105 remains unchanged through the clamping rod 2107. The clamping rod 2107 can be removed later, so that the device can adapt to the use of steel pipes with shorter lengths.

[0034] Specifically, the present invention is a novel three-station electric heating tube spiral bending machine, first, as Figures 1-6 As shown, the distances between each group of the first pressing wheel 5, the second pressing wheel 17 and the third pressing wheel 18 and the first supporting seat 1, the second supporting seat 2 and the third supporting seat 3 decrease from left to right ( Figure 1 As can be seen in the figure), the gap between the first support seat 1 and the first pressing wheel 5, the second pressing wheel 17 and the third pressing wheel 18 on the support seat can allow the steel pipes to be processed on the second support seat 2 and the third support seat 3 to pass through, and the gap between the second support seat 2 and the first pressing wheel 5, the second pressing wheel 17 and the third pressing wheel 18 on the support seat can allow the steel pipes to be processed on the third support seat 3 to pass through. The metal pipe 13 is guided by the support plate 12, so that multiple steel pipes can be processed at the same time. Figure 2 As shown, when processing spiral steel pipes, the device can change the radius and pitch of the spiral bending. When the spiral radius needs to be adjusted, the connecting rod 8 in the connecting ring 7 is removed, and the connecting ring 7 and the first screw 6 are rotated. Since the first screw 6 and the support seat are threadedly connected, and the rotating shaft 14 and the adjusting block 4 are rotatably connected, the first screw 6 will drive the adjusting block 4 and the first pressing wheel 5 to rise and fall, thereby changing the bending effect of the device. After the adjustment is completed, the connecting rod 8 is installed in the connecting ring 7 to ensure that the first support seat 1, the second support seat 2 and the third support seat 3 are aligned, and the corresponding first screws 6 on the first support seat 1, the second support seat 2 and the third support seat 3 are screwed in to the same degree, so that when the metal tube 13 is fed, the degree to which the metal tube 13 is pressed down changes, thereby changing the spiral radius of the subsequently formed spiral steel pipe.

[0035] When the spiral pitch of the metal tube 13 needs to be adjusted, Figure 1 、 Figure 2 and Figure 7-11 As shown, the second screw 2102 is driven to rotate by the fourth motor 2101, driving the slide 2103 to slide in the corresponding support seat. At this time, the slide 2103 drives the connecting plate 2106 to move, and the first rotating plate 2104 and the second rotating plate 2105 rotate in opposite directions. The second rotating plate 2105 rotates on the fixed block 2108 with the clamping rod 2107 as the axis. The positions of the first pressure wheel 5, the second pressure wheel 17 and the third pressure wheel 18 remain unchanged. The three fourth pressure wheels 903 will slide as the center position of the second rotating plate 2105 changes. The three fifth pressure wheels 906 will move as the first rotating plate 2104 rotates. The distance between adjacent connecting plates 2106 changes, the first key rod 902 slides in the first key cylinder 901, the second key rod 905 slides in the second key cylinder 904, and the distance between the three groups of pressure wheels changes. At this time, by extending the electric push rod 1601, the ball bearing 1603 on the turntable 1602 abuts the steel pipe, allowing the steel pipe to move along a spiral trajectory of different pitches. Then, the three sets of fourth pressing rollers 903 and fifth pressing rollers 906 on the three support seats guide the three steel pipes, allowing the device to simultaneously produce multiple spiral steel pipes with different pitches and different radii. The first motor 15 drives the first pressing roller 5 to rotate in the forward direction, and the second motor 19 and the third motor 20 drive the second pressing roller 17 and the third pressing roller 18 to rotate in the reverse direction, so that the steel pipe can continue to move after being bent, thereby producing spiral steel pipes. The second key rod 905 rotates on the connecting ring 1102 through the connecting sleeve 1101. The fixed plate 1103 is used to support the connecting ring 1102 and each set of pressing rollers.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A novel three-station electric heating tube spiral bending machine, comprising a first support base (1), a second support base (2) and a third support base (3) arranged in parallel, characterized in that: An adjusting block (4) is slidably mounted on each of the first supporting seat (1), the second supporting seat (2) and the third supporting seat (3); each of the first supporting seat (1), the second supporting seat (2) and the third supporting seat (3) is threadedly connected to a first screw rod (6); a first pressing wheel (5) is rotatably mounted on the adjusting block (4); a rotating shaft (14) is rotatably mounted on the adjusting block (4); the rotating shaft (14) is connected to the first screw rod (6); a first motor (15), a second motor (19) and a third motor (20) are mounted on the backs of each of the first supporting seat (1), the second supporting seat (2) and the third supporting seat (3); The output shaft of the first motor (15) is connected to the first pressure wheel (5), the output shaft of the second motor (19) is fixedly connected to the second pressure wheel (17), and the output shaft of the third motor (20) is fixedly connected to the third pressure wheel (18). The first pressure wheel (5), the second pressure wheel (17) and the third pressure wheel (18) are all installed with a guide assembly (9), a connecting assembly (11) is provided on the guide assembly (9), and a pitch adjustment assembly (21) is provided below the connecting assembly (11). A support plate (12) is installed on the first support seat (1), and a metal tube (13) is provided through the support plate (12).

2. A novel three-station electric heating tube spiral bending machine according to claim 1, characterized in that: The first support seat (1), the second support seat (2) and the third support seat (3) have the same structure but different lengths. The first support seat (1), the second support seat (2) and the third support seat (3) are all provided with a sliding groove (10) for the adjustment block (4) to slide. The first support seat (1), the second support seat (2) and the third support seat (3) are all installed with a support assembly (16).

3. A novel three-station electric heating tube spiral bending machine according to claim 1, characterized in that: A connecting ring (7) is fixedly provided on the first screw rod (6), and a connecting rod (8) is provided in the connecting ring (7). The distances between each group of the first pressing wheel (5), the second pressing wheel (17) and the third pressing wheel (18) and the first support seat (1), the second support seat (2) and the third support seat (3) decrease from left to right.

4. A novel three-station electric heating tube spiral bending machine according to claim 1, characterized in that: The guide assembly (9) comprises a first key cylinder (901) fixedly connected to the first pressure wheel (5), the second pressure wheel (17) and the third pressure wheel (18); a first key rod (902) is connected to the first key cylinder (901); a fourth pressure wheel (903) is fixedly connected to the first key rod (902); a second key cylinder (904) is fixedly provided on the fourth pressure wheel (903); a second key cylinder (904) is connected to the second key rod (905) by a key; and a fifth pressure wheel (906) is fixedly provided on the second key rod (905).

5. A novel three-station electric heating tube spiral bending machine according to claim 4, characterized in that: The fourth pressure wheel (903), the fifth pressure wheel (906), the first pressure wheel (5), the second pressure wheel (17) and the third pressure wheel (18) are all of the same size and structure. The fourth pressure wheel (903) and the fifth pressure wheel (906) form a synchronous rotation structure with the first pressure wheel (5) through the second key rod (905) and the second key cylinder (904).

6. A novel three-station electric heating tube spiral bending machine according to claim 4, characterized in that: The connecting assembly (11) comprises a connecting sleeve (1101) fixedly connected to the second key rod (905), a connecting ring (1102) is installed on the outer side of the connecting sleeve (1101), the connecting ring (1102) and the connecting sleeve (1101) are rotatably connected, and a fixing plate (1103) is welded to the bottom of the connecting ring (1102).

7. The novel three-station electric heating tube spiral bending machine according to claim 2 is characterized in that: The support assembly (16) comprises an electric push rod (1601) mounted on the first support seat (1), the second support seat (2) and the third support seat (3); a turntable (1602) is rotatably mounted on the electric push rod (1601); balls (1603) are rotatably mounted on the turntable (1602); and the balls (1603) are evenly distributed on the turntable (1602).

8. The novel three-station electric heating tube spiral bending machine according to claim 1 is characterized in that: The second pressing wheel (17) and the third pressing wheel (18) are symmetrically distributed on both sides of the first pressing wheel (5), and the first pressing wheel (5) forms a lifting structure with the third support seat (3) through the adjusting block (4) and the first screw (6).

9. The novel three-station electric heating tube spiral bending machine according to claim 6 is characterized in that: The pitch adjustment assembly (21) comprises a fourth motor (2101) mounted on the first support seat (1), the second support seat (2) and the third support seat (3); a second screw rod (2102) is fixedly connected to the output shaft of the fourth motor (2101); a slide plate (2103) is threadedly mounted on the outer side of the second screw rod (2102); a first rotating plate (2104) is rotatably mounted above the slide plate (2103); a second rotating plate (2105) is rotatably mounted on the first rotating plate (2104); a connecting plate (2106) is fixedly arranged at the bottom of the fixed plate (1103); the connecting plate (2106) below the fifth pressure wheel (906) is rotatably connected to the first rotating plate (2104) and the fixed plate (1103); and the second rotating plate (2105) is rotatably connected to the connecting plate (2106) below the fourth pressure wheel (903).

10. A novel three-station electric heating tube spiral bending machine according to claim 9, characterized in that: A clamping rod (2107) is provided through the second rotating plate (2105), and a fixing block (2108) is fixedly provided on each of the first supporting seat (1), the second supporting seat (2) and the third supporting seat (3), and the clamping rod (2107) is provided through the fixing block (2108).

Images