Electric heating tube cutting machine

Abstract

The utility model discloses an electric heating tube cutting machine which comprises a machine frame, a machining mechanism and a clamping mechanism, and the machine frame comprises a workbench and a portal frame. The number of the machining mechanisms is two, each machining mechanism comprises an installation frame installed on the portal frame, a grooving assembly and a pipe end cutting assembly, the grooving assembly and the pipe end cutting assembly are arranged on the installation frame, the grooving assembly and the pipe end cutting assembly are arranged front and back, the grooving assembly is used for grooving the double-pipe electric heating pipe, and the pipe end cutting assembly is used for cutting the pipe end of the double-pipe electric heating pipe short; the clamping mechanism comprises a sliding base arranged on the workbench in a front-back sliding mode, a clamp arranged on the sliding base and a first power piece driving the sliding base to move front and back, the clamp is used for clamping the double-tube electric heating tube, and the first power piece drives the sliding base to slide front and back so that the double-tube electric heating tube on the clamp can pass through the grooving assembly and the tube end cutting assembly. According to the electric heating tube cutting machine, grooving and tube end cutting operation can be completed after a double-tube electric heating tube is clamped on the tube cutting machine at a time, and tube cutting efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heating tube production equipment, in particular to an electric heating tube cutting machine. Background Art

[0002] A cutting machine is a device used to cut electric heating tubes. The existing cutting machines can cut both ends of the electric heating tubes.

[0003] In the related art, a double-tube electric heating tube is one type of electric heating tube. The double-tube electric heating tube is formed by gluing two electric heating tubes side by side. When cutting the tube, it is necessary to cut short the tube end of one of the electric heating tubes, and at the same time, it is necessary to cut a groove along the axial direction of the electric heating tube at the glued position between the two electric heating tubes.

[0004] However, the existing cutting operation for double-tube electric heating tubes requires cutting a groove on a grooving machine first and then disassembling and transferring the double-tube electric heating tube to the cutting machine for clamping to cut the tube end, resulting in low cutting efficiency. Summary of the Utility Model

[0005] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides an electric heating tube cutting machine, which can complete the groove cutting and tube end cutting operations on the double-tube electric heating tube after one clamping on the cutting machine, thereby improving the cutting efficiency.

[0006] An electric heating tube cutting machine according to an embodiment of the first aspect of the utility model includes: a frame, including a workbench and a gantry arranged on the workbench; two processing mechanisms, which are symmetrically arranged left and right on the gantry. Each processing mechanism includes a mounting frame mounted on the gantry, a groove cutting assembly and a tube end cutting assembly arranged on the mounting frame. The groove cutting assembly and the tube end cutting assembly are arranged front and back. The groove cutting assembly is used to cut a groove in the double-tube electric heating tube, and the tube end cutting assembly is used to cut short the tube end of the double-tube electric heating tube; a clamping mechanism, including a sliding seat slidably arranged back and forth on the workbench, a clamp arranged on the sliding seat, and a first power member for driving the sliding seat to move back and forth. The clamp is used to clamp the double-tube electric heating tube, and the first power member drives the sliding seat to slide back and forth so that the double-tube electric heating tube on the clamp passes through the groove cutting assembly and the tube end cutting assembly.

[0007] An electric heating tube cutting machine according to an embodiment of the utility model has at least the following beneficial effects:

[0008] 1. By providing two processing mechanisms symmetrically arranged left and right on the gantry, the two processing mechanisms can simultaneously process both ends of the double-tube electric heating tube, thereby improving the processing efficiency.

[0009] 2. The utility model is provided with a mounting frame installed on the gantry in the processing mechanism, a grooving component and a pipe end cutting component arranged on the mounting frame. The grooving component and the pipe end cutting component are arranged in the front and back. The grooving component is used for grooving the double-tube electric heating pipe, and the pipe end cutting component is used for cutting the pipe ends of the double-tube electric heating pipe. It can be understood that when the double-tube electric heating pipe passes through the processing mechanism, the grooving component and the pipe end cutting component can respectively groove and cut the pipe ends of the double-tube electric heating pipe. Thus, the pipe end cutting and grooving operations can be completed after one clamping on the pipe cutting machine, improving the pipe cutting efficiency.

[0010] 3. The utility model is provided with a clamping mechanism. The clamping mechanism includes a sliding seat slidably arranged on the workbench in the front and back directions, a clamp arranged on the sliding seat, and a first power component for driving the sliding seat to move back and forth. The clamp is used for clamping the double-tube electric heating pipe. The first power component drives the sliding seat to slide back and forth so that the double-tube electric heating pipe on the clamp passes through the grooving component and the pipe end cutting component. It can be understood that when the first power component drives the sliding seat to slide, the double-tube electric heating pipe on the clamp can pass through the processing mechanism, enabling the grooving component and the pipe end cutting component to respectively groove the end of the electric heating pipe and cut the pipe end when the double-tube electric heating pipe passes by. Thus, the pipe cutting machine can automatically feed and process the double-tube electric heating pipe, and further improve the processing efficiency.

[0011] According to some embodiments of the present utility model, the mounting frame is slidably arranged on the gantry in the left and right directions. A first screw rod extending in the left and right directions is further arranged between the mounting frame and the gantry. The first screw rod is rotatably connected to one of the mounting frame and the gantry, and is threadedly connected to the other of the mounting frame and the gantry. The first screw rod rotates to drive the mounting frame to move left and right.

[0012] According to some embodiments of the present utility model, a first waist-shaped hole is arranged on the mounting frame. The length direction of the first waist-shaped hole is arranged along the left and right directions. A first bolt is arranged in the first waist-shaped hole, and the first bolt is threadedly connected to the gantry.

[0013] According to some embodiments of the present utility model, a second waist-shaped hole is arranged on the mounting frame. The length direction of the second waist-shaped hole is arranged along the up and down directions. A second bolt is arranged in the second waist-shaped hole, and the second bolt is threadedly connected to the grooving component.

[0014] According to some embodiments of the present utility model, a third waist-shaped hole is arranged on the mounting frame. The length direction of the third waist-shaped hole is arranged along the up and down directions. A third bolt is arranged in the third waist-shaped hole, and the third bolt is threadedly connected to the pipe end cutting component.

[0015] According to some embodiments of the present utility model, the processing mechanism further includes a first blanking chute, one end of the first blanking chute is located below the grooving assembly and the pipe cutting end assembly, and the other end of the first blanking chute extends downward and obliquely outward from the workbench. The first blanking chute is used to receive the waste materials that fall after the pipe cutting is output.

[0016] According to some embodiments of the present utility model, the fixture includes a first clamping block, a second clamping block and a first air cylinder. The first clamping block and the first air cylinder are fixed on the sliding seat. The first air cylinder is used to drive the second clamping block to move back and forth to approach and separate from the first clamping block. The first clamping block and the second clamping block cooperate to clamp the double-tube electric heating pipe.

[0017] According to some embodiments of the present utility model, a positioning groove is provided on one side of the second clamping block close to the first clamping block. The positioning groove is used to position the double-tube electric heating pipe.

[0018] According to some embodiments of the present utility model, the clamping mechanism further includes an alignment assembly. The alignment assembly includes a first aligning member, a second aligning member and a second air cylinder. The first aligning member and the second aligning member are respectively located on the left and right sides of the fixture. The second air cylinder is used to drive the second aligning member to approach and separate from the first aligning member. The first aligning member is used to align one end of the double-tube electric heating pipe, and the second aligning member is used to align the other end of the double-tube electric heating pipe.

[0019] According to some embodiments of the present utility model, the alignment assembly further includes two brackets. The two brackets are respectively used to support both ends of the double-tube electric heating pipe. The first aligning member is arranged on one of the brackets, and the second air cylinder is arranged on the other bracket.

[0020] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0021] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0022] Figure 1 is a schematic structural diagram of an electric heating pipe cutting machine according to an embodiment of the present utility model;

[0023] Figure 2 is Figure 1 a schematic structural diagram shown from another perspective;

[0024] Figure 3 is Figure 1 a top view shown;

[0025] Figure 4 For Figure 1 the side view shown.

[0026] Reference numerals: 100 - frame, 110 - workbench, 120 - gantry, 130 - mounting bracket, 140 - grooving assembly, 150 - pipe end cutting assembly, 160 - sliding seat, 170 - fixture, 180 - first power member, 190 - first screw, 200 - first waist-shaped hole, 210 - second waist-shaped hole, 220 - third waist-shaped hole, 230 - first blanking chute, 240 - first clamping block, 250 - second clamping block, 260 - first cylinder, 270 - positioning groove, 280 - first alignment member, 290 - second alignment member, 300 - second cylinder, 310 - bracket. Detailed implementation manners

[0027] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0028] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0029] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] The following describes a cutting machine for electric heating tubes according to an embodiment of the present invention in conjunction with the accompanying drawings.

[0032] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , a cutting machine for electric heating tubes according to an embodiment of the present invention includes a frame 100, a processing mechanism, and a clamping mechanism.

[0033] For the frame 100, the frame 100 includes a workbench 110 and a gantry 120 disposed on the workbench 110.

[0034] For the processing mechanism, there are two processing mechanisms, which are symmetrically arranged on the gantry 120 left and right. Thus, the two processing mechanisms can process both ends of the double-tube electric heating tube simultaneously, improving the processing efficiency.

[0035] Specifically, the processing mechanism includes a mounting frame 130 mounted on the gantry 120, a grooving assembly 140 and a tube-end cutting assembly 150 disposed on the mounting frame 130. The grooving assembly 140 and the tube-end cutting assembly 150 are arranged front and back. The grooving assembly 140 is used to groove the double-tube electric heating tube, and the tube-end cutting assembly 150 is used to cut short the tube ends of the double-tube electric heating tube.

[0036] It can be understood that when the double-tube electric heating tube passes through the processing mechanism, the grooving assembly 140 and the tube-end cutting assembly 150 can groove and cut the tube ends of the double-tube electric heating tube respectively. Thus, the tube-end cutting and grooving operations can be completed after one clamping on the cutting machine, improving the cutting efficiency.

[0037] In some specific embodiments, the mounting frame 130 is slidably arranged left and right on the gantry 120. A first screw rod 190 extending left and right is further provided between the mounting frame 130 and the gantry 120. The first screw rod 190 is rotationally connected to one of the mounting frame 130 and the gantry 120, and the first screw rod 190 is threadedly connected to the other of the mounting frame 130 and the gantry 120. The first screw rod 190 rotates to drive the mounting frame 130 to move left and right.

[0038] It can be understood that by rotating the first screw rod 190, the first screw rod 190 can drive the mounting frame 130 to move left and right. Thus, it is convenient to adjust the left and right positions of the mounting frame 130 on the gantry 120. Furthermore, the grooving assembly 140 and the tube-end cutting assembly 150 on the mounting frame 130 can adjust the cutting dimensions to adapt to different cutting length requirements.

[0039] In some specific embodiments, a first elongated hole 200 is provided on the mounting bracket 130. The length direction of the first elongated hole 200 is arranged along the left - right direction. A first bolt is arranged in the first elongated hole 200, and the first bolt is in threaded connection with the gantry 120. Thus, when it is necessary to adjust the left - right position of the mounting bracket 130, the first bolt can be loosened. After adjusting the left - right position of the mounting bracket 130, the first bolt can be tightened so that the first bolt locks the mounting bracket 130 and the gantry 120. Furthermore, the mounting bracket 130 is made more stable and not prone to shaking, ensuring the processing stability of the grooving assembly 140 and the pipe - end cutting assembly 150 mounted on the mounting bracket 130.

[0040] In some specific embodiments, a second elongated hole 210 is provided on the mounting bracket 130. The length direction of the second elongated hole 210 is arranged along the up - down direction. A second bolt is arranged in the second elongated hole 210, and the second bolt is in threaded connection with the grooving assembly 140. Thus, by adjusting the position of the second bolt along the length direction of the second elongated hole 210 in the second elongated hole 210, the height position of the grooving assembly 140 relative to the mounting bracket 130 can be adjusted. Furthermore, it is convenient to adjust the height of the grooving assembly 140 so that the grooving assembly 140 can adapt to grooving double - tube electric heating pipes with different diameter sizes.

[0041] In some specific embodiments, a third elongated hole 220 is provided on the mounting bracket 130. The length direction of the third elongated hole 220 is arranged along the up - down direction. A third bolt is arranged in the third elongated hole 220, and the third bolt is in threaded connection with the pipe - end cutting assembly 150. Thus, by adjusting the position of the third bolt along the length direction of the second elongated hole 210 in the third elongated hole 220, the height position of the pipe - end cutting assembly 150 relative to the mounting bracket 130 can be adjusted. Furthermore, it is convenient to adjust the height of the pipe - end cutting assembly 150 so that the pipe - end cutting assembly 150 can adapt to cutting the pipe ends of double - tube electric heating pipes with different diameter sizes.

[0042] In some specific embodiments, the processing mechanism further includes a first discharge chute 230. One end of the first discharge chute 230 is located below the grooving assembly 140 and the pipe - end cutting assembly 150, and the other end of the first discharge chute 230 extends downward and obliquely outside the workbench 110. The first discharge chute 230 is used to receive the waste materials that fall after pipe cutting and output. Thus, the waste materials cut off by the processing mechanism can be guided and output by the first discharge chute 230. Furthermore, it is convenient to collect the waste materials uniformly.

[0043] In some specific embodiments, the grooving assembly 140 includes a first circular cutter and a second motor that drives the first circular cutter to rotate. The pipe - end cutting assembly 150 includes a second circular cutter and a third motor that drives the second circular cutter to rotate.

[0044] For the clamping mechanism, it includes a sliding seat 160 slidably arranged back and forth on the workbench 110, a fixture 170 arranged on the sliding seat 160, and a first power member 180 for driving the sliding seat 160 to move back and forth. The fixture 170 is used for clamping the double-tube electric heating tube, and the first power member 180 drives the sliding seat 160 to slide back and forth so that the double-tube electric heating tube on the fixture 170 passes through the grooving assembly 140 and the tube-end cutting assembly 150.

[0045] It can be understood that when the first power member 180 drives the sliding seat 160 to slide, the double-tube electric heating tube on the fixture 170 can pass through the processing mechanism, enabling the grooving assembly 140 and the tube-end cutting assembly 150 to respectively cut the grooves at the ends of the electric heating tube and cut the tube ends when the double-tube electric heating tube passes through. Thus, the tube cutting machine can automatically feed and process the double-tube electric heating tube, and further improve the processing efficiency.

[0046] In some specific embodiments, the fixture 170 includes a first clamping block 240, a second clamping block 250, and a first cylinder 260. The first clamping block 240 and the first cylinder 260 are fixed on the sliding seat 160. The first cylinder 260 is used for driving the second clamping block 250 to move back and forth to approach and separate from the first clamping block 240. The first clamping block 240 and the second clamping block 250 cooperate to clamp the double-tube electric heating tube. Thus, the first clamping block 240 and the second clamping block 250 can cooperate to quickly clamp and release the double-tube electric heating tube, and further improve the clamping efficiency of the double-tube electric heating tube.

[0047] Furthermore, a positioning groove 270 is arranged on the side of the second clamping block 250 close to the first clamping block 240. The positioning groove 270 is used for positioning the double-tube electric heating tube. Thus, the positioning groove 270 can position the double-tube electric heating tube, and further make the clamping position of the double-tube electric heating tube more accurate.

[0048] In some specific embodiments, the clamping mechanism further includes an alignment assembly. The alignment assembly includes a first aligning member 280, a second aligning member 290, and a second cylinder 300. The first aligning member 280 and the second aligning member 290 are respectively located on the left and right sides of the fixture 170. The second cylinder 300 is used for driving the second aligning member 290 to approach and separate from the first aligning member 280. The first aligning member 280 is used for aligning one end of the double-tube electric heating tube, and the second aligning member 290 is used for aligning the other end of the double-tube electric heating tube.

[0049] It can be understood that when clamping the double-tube electric heating tube, the second cylinder 300 drives the second aligning member 290 to approach the first aligning member 280, so that the first aligning member 280 and the second aligning member 290 cooperate to align the two ends of the double-tube electric heating tube, and further make the clamping position of the double-tube electric heating tube more accurate.

[0050] Further, the alignment component further includes two brackets 310, which are respectively used to support both ends of the double-tube electric heating tube. The first alignment member 280 is disposed on one of the brackets 310, and the second cylinder 300 is disposed on the other bracket 310. Thus, when the two ends of the double-tube electric heating tube are aligned by the first alignment member 280 and the second alignment member 290, the two brackets 310 can support the double-tube electric heating tube to prevent it from falling.

[0051] In some specific embodiments, the bracket 310 is fixed to the workbench 110, and the bracket 310 is located on the front side of the processing mechanism. Thus, the alignment component can align both ends of the double-tube electric heating tube on the fixture 170 before processing.

[0052] In some specific embodiments, the slide base 160 has a first blanking port that penetrates up and down. The first blanking port is located below the fixture 170. The workbench 110 is provided with a second blanking port that penetrates up and down. The second blanking port is located on the rear side of the processing mechanism. When the slide base 160 slides to the rear side of the processing mechanism, the first blanking port can be aligned with the second blanking port. A second blanking groove is further provided at the bottom of the workbench 110. One end of the second blanking groove is located below the second blanking port, and the other end of the second blanking groove extends downward. Thus, after the double-tube electric heating tube on the fixture 170 is processed, the fixture 170 releases the double-tube electric heating tube, and the double-tube electric heating tube falls into the second blanking groove through the first blanking port and the second blanking port, and the second blanking groove guides the double-tube electric heating tube for discharging.

[0053] In some specific embodiments, the first power member 180 includes a second screw rod and a first motor that drives the second screw rod to rotate. The first motor is fixed to the workbench 110, and the second screw rod is threadedly connected to the slide base 160. The second screw rod rotates to drive the slide base 160 to slide back and forth. Thus, the driving of the slide base 160 by the first power member 180 is more flexible.

[0054] In other embodiments, the first power member 180 can also be set as a cylinder, and the telescopic rod of the cylinder expands and contracts to drive the slide base 160 to slide back and forth.

[0055] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the gist of the present utility model within the scope of knowledge possessed by those of ordinary skill in the relevant art.

Claims

1. An electric heating tube cutting machine, characterized in that: include: A frame (100) comprises a workbench (110) and a gantry (120) arranged on the workbench (110); Two processing mechanisms are provided, and the two processing mechanisms are symmetrically arranged on the gantry (120). The processing mechanisms include a mounting frame (130) mounted on the gantry (120), a grooving assembly (140) and a pipe cutting end assembly (150) arranged on the mounting frame (130). The grooving assembly (140) and the pipe cutting end assembly (150) are arranged in a front-to-back arrangement. The grooving assembly (140) is used for grooving a double-tube electric heating pipe, and the pipe cutting end assembly (150) is used for shortening the pipe ends of the double-tube electric heating pipe. The clamping mechanism comprises a slide seat (160) which is slidably arranged on the workbench (110) forward and backward, a clamp (170) which is arranged on the slide seat (160), and a first power member (180) which drives the slide seat (160) to move forward and backward, wherein the clamp (170) is used to clamp the double-tube electric heating pipe, and the first power member (180) drives the slide seat (160) to slide forward and backward so that the double-tube electric heating pipe on the clamp (170) passes through the grooving assembly (140) and the pipe cutting end assembly (150).

2. The electric heating tube cutting machine according to claim 1, characterized in that: The mounting frame (130) is slidably arranged on the gantry (120) left and right, and a first screw rod (190) extending left and right is further arranged between the mounting frame (130) and the gantry (120). The first screw rod (190) is rotatably connected to one of the mounting frame (130) and the gantry (120), and the first screw rod (190) is threadedly connected to the other of the mounting frame (130) and the gantry (120). The first screw rod (190) rotates to drive the mounting frame (130) to move left and right.

3. The electric heating tube cutting machine according to claim 2, characterized in that: The mounting frame (130) is provided with a first waist hole (200), the length direction of the first waist hole (200) is arranged along the left-right direction, a first bolt is arranged in the first waist hole (200), and the first bolt is threadedly connected to the gantry frame (120).

4. The electric heating tube cutting machine according to claim 1, characterized in that: The mounting frame (130) is provided with a second waist hole (210), the length direction of the second waist hole (210) is arranged along the up-down direction, a second bolt is arranged in the second waist hole (210), and the second bolt is threadedly connected to the slotting assembly (140).

5. The electric heating tube cutting machine according to claim 1, characterized in that: The mounting frame (130) is provided with a third waist hole (220), the length direction of the third waist hole (220) is arranged along the up-down direction, a third bolt is arranged in the third waist hole (220), and the third bolt is threadedly connected to the pipe cutting end assembly (150).

6. The electric heating tube cutting machine according to claim 1, characterized in that: The processing mechanism also includes a first material discharge chute (230), one end of which is located below the grooving assembly (140) and the pipe cutting end assembly (150), and the other end of the first material discharge chute (230) extends downwardly and obliquely outside the workbench (110), and the first material discharge chute (230) is used to receive waste materials that fall after pipe cutting.

7. The electric heating tube cutting machine according to claim 1, characterized in that: The clamp (170) comprises a first clamp block (240), a second clamp block (250) and a first cylinder (260); the first clamp block (240) and the first cylinder (260) are fixed on the slide seat (160); the first cylinder (260) is used to drive the second clamp block (250) to move forward and backward to approach and move away from the first clamp block (240); the first clamp block (240) and the second clamp block (250) cooperate to clamp the double-tube electric heating tube.

8. The electric heating tube cutting machine according to claim 7, characterized in that: A positioning groove (270) is provided on one side of the second clamping block (250) close to the first clamping block (240), and the positioning groove (270) is used to position the double-tube electric heating tube.

9. The electric heating tube cutting machine according to claim 1, characterized in that: The clamping mechanism also includes an alignment component, which includes a first alignment member (280), a second alignment member (290) and a second cylinder (300). The first alignment member (280) and the second alignment member (290) are respectively located on the left and right sides of the clamp (170). The second cylinder (300) is used to drive the second alignment member (290) to move closer to and away from the first alignment member (280). The first alignment member (280) is used to align one end of the double-tube electric heating tube, and the second alignment member (290) is used to align the other end of the double-tube electric heating tube.

10. The electric heating tube cutting machine according to claim 9, characterized in that: The alignment assembly further comprises two brackets (310), the two brackets (310) being used to support the two ends of the double-tube electric heating tube respectively, the first alignment member (280) being arranged on one of the brackets (310), and the second cylinder (300) being arranged on the other bracket (310).

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