CN111515570A

CN111515570A - Pipe welding equipment for thin-wall metal pipe

Info

Publication number: CN111515570A
Application number: CN202010358201.4A
Authority: CN
Inventors: 金栋
Original assignee: 金栋
Current assignee: Dongguan Xinghai Sheng Precision Technology Co.,Ltd.
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-08-11
Anticipated expiration: 2040-04-29
Also published as: CN111515570B

Abstract

The invention relates to a pipe welding device for a thin-wall metal pipe. The welding pipe equipment of the thin-wall metal pipe comprises a tripod, a pressing mechanism and a welding robot, wherein an installation beam is arranged at the top of the tripod, a suspension shaft is arranged in the middle of the tripod and located below the installation beam, the suspension shaft is used for supporting the thin-wall metal pipe, a welding seam of the thin-wall metal pipe faces upwards and extends along the length direction of the thin-wall metal pipe, the pressing mechanism comprises a transverse moving motor, a lifting motor, a pressing assembly and a leveling assembly, and the transverse moving motor is installed on the installation beam. The welding quality of the pipe welding equipment for the thin-wall metal pipe is good.

Description

Pipe welding equipment for thin-wall metal pipe

Technical Field

The invention relates to a pipe welding device for a thin-wall metal pipe.

Background

In the field of welding of thin-wall metal pipes, the weld seam of the thin-wall metal pipe is a slit extending along the axial direction of the thin-wall metal pipe, and a key structure is generally adopted for pressing and positioning. However, the material in the gap between two adjacent key structures is prone to warp, and the subsequent welding quality is affected.

Disclosure of Invention

Based on this, it is necessary to provide a tube welding apparatus for thin-walled metal tubes with good welding quality.

A pipe welding device for thin-wall metal pipes comprises a tripod, a pressing mechanism and a welding robot, wherein the top of the tripod is provided with an installation beam, the middle of the tripod is provided with a suspension shaft which is positioned below the installation beam and is used for supporting the thin-wall metal pipes, welding seams of the thin-wall metal pipes face upwards and extend along the length direction of the thin-wall metal pipes, the pressing mechanism comprises a traverse motor, a lifting motor, a pressing component and a leveling component, the traverse motor is arranged on the installation beam, the lifting motor is slidably arranged on the installation beam and connected to an output shaft of the traverse motor, the pressing component and the leveling component are both connected to an output shaft of the lifting motor and pressed on two opposite side walls of the welding seams, and the leveling component is also used for reciprocating under the driving of the traverse motor, so as to level the opposite side walls of the weld, and the welding robot is used for welding the weld of the thin-wall metal pipe.

In one embodiment, the tripod comprises a triangular bottom plate, a longitudinal beam and two inclined rods, wherein the longitudinal beam is vertically arranged at one end of the triangular bottom plate, and the two inclined rods are respectively arranged at two opposite sides of the other end of the triangular bottom plate.

In one embodiment, the top end of the longitudinal beam is mounted at one end of the mounting beam, the top ends of the two inclined rods are mounted at the other end of the mounting beam, and the distance between the two inclined rods is gradually reduced along the vertical upward direction.

In one embodiment, a rotating motor is installed in the middle of the longitudinal beam, one end of a suspension shaft is installed on an output shaft of the rotating motor, a clamping piece is further arranged on the longitudinal beam and used for clamping and positioning the thin-wall metal pipe, and the suspension shaft is further used for rotating in a reciprocating mode under the driving of the rotating motor so as to polish the bottoms of the two opposite side walls of the welding seam through the peripheral surface of the suspension shaft.

In one embodiment, a cantilever is rotatably arranged at one end, away from the longitudinal beam, of the mounting beam, an insertion column is transversely and convexly arranged at the bottom end of the cantilever, a circular insertion hole is concavely arranged at one end face, away from the rotating motor, of the suspension shaft, and the insertion column is used for being inserted into the insertion hole of the suspension shaft to hang the suspension shaft.

In one embodiment, a free hole is formed in one of the diagonal rods for the insertion of the insertion column, so that the cantilever avoids the thin-wall metal pipe for discharging.

In one embodiment, the mounting beam is parallel to the suspension shaft, the bottom surface of the mounting beam is provided with a guide rail, the shell of the lifting motor is concavely provided with a sliding groove, and the guide rail is clamped in the sliding groove to allow the lifting motor to slide along the guide rail.

In one embodiment, a rectangular column is fixed on an output shaft of the lifting motor, a pressing plate is fixed in the middle of the rectangular column, the leveling assembly comprises a transverse rod, two vertical rods and two leveling frames, the middle of the transverse rod is vertically fixed to the bottom end of the rectangular column, the two vertical rods are respectively vertically fixed to two opposite ends of the transverse rod, and the two leveling frames are respectively connected to the bottom ends of the two vertical rods and respectively abut against two opposite side walls of a welding seam.

In one embodiment, each leveling frame comprises an installation rod, a first comb-shaped structure and a plurality of leveling blocks, one end of the installation rod is vertically fixed at the bottom end of the vertical rod, the first comb-shaped structure is installed at the other end of the installation rod, and the leveling blocks are installed on the first comb-shaped structure side by side and abut against the side wall of the welding seam.

In one embodiment, the pressing component comprises a rectangular frame, two L-shaped rods and two second comb structures, the rectangular frame is pressed against the bottom surface of the pressing plate, the rectangular frame is provided with a strip-shaped guide groove, the rectangular column is arranged in the strip-shaped guide groove of the rectangular frame in a penetrating manner, the two L-shaped rods are respectively fixed on two opposite side walls of the rectangular frame, the two second comb structures are respectively arranged on the two L-shaped rods, and the two second comb structures are respectively positioned below the two first comb structures.

When the welding pipe equipment of the thin-wall metal pipe is used for welding, the abutting components are firstly utilized to abut against two opposite side walls of a welding line, then the traversing motor is utilized to reciprocate to level the two opposite side walls of the welding line, namely, the welding line side walls exposed at the interval of the abutting components are leveled, then the traversing motor is utilized to abut against the two opposite side walls of the welding line, and then the machine welding robot is utilized to weld the welding line of the thin-wall metal pipe.

Drawings

Fig. 1 is a perspective view of a thin-walled metal tube welding apparatus according to an embodiment.

Fig. 2 is a side view of the tube welding apparatus for the thin-walled metal tube shown in fig. 1.

Fig. 3 is a perspective view of another perspective view of the apparatus for welding thin-walled metal tubes shown in fig. 1.

Fig. 4 is a partially enlarged view of C in fig. 1.

Fig. 5 is a partial enlarged view of fig. 3 at D.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The invention relates to a pipe welding device for a thin-wall metal pipe. For example, the pipe welding equipment for the thin-wall metal pipe comprises a tripod, a pressing mechanism and a welding robot, wherein a mounting beam is arranged at the top of the tripod, a suspension shaft is arranged in the middle of the tripod, and the suspension shaft is positioned below the mounting beam. For example, the suspension shaft is used for supporting a thin-wall metal pipe, a welding seam of the thin-wall metal pipe faces upwards and extends along the length direction of the thin-wall metal pipe, and the abutting mechanism comprises a transverse moving motor, a lifting motor, an abutting assembly and a leveling assembly. For example, the traverse motor is installed on the installation beam, the lifting motor is installed on the installation beam in a sliding mode and connected to an output shaft of the traverse motor, and the abutting assembly and the leveling assembly are connected to the output shaft of the lifting motor and abutted against two opposite side walls of the welding seam. For example, the leveling assembly is also used for reciprocating under the driving of the traverse motor so as to level two opposite side walls of the welding seam, and the welding robot is used for welding the welding seam of the thin-wall metal pipe.

Referring to fig. 1 to 5, a pipe welding apparatus for thin-wall metal pipes includes a tripod 10, a pressing mechanism 20 and a welding robot (not shown), a mounting beam 11 is disposed on the top of the tripod 10, a suspension shaft 12 is disposed in the middle of the tripod 10, the suspension shaft 12 is disposed below the mounting beam 11, the suspension shaft 12 is used for supporting the thin-wall metal pipe 100, a welding seam 108 of the thin-wall metal pipe 100 faces upward and extends along the length direction of the thin-wall metal pipe 100, the pressing mechanism 20 includes a traverse motor 21, a lift motor 22, a pressing assembly 30 and a leveling assembly 40, the traverse motor 21 is mounted on the mounting beam 11, the lift motor 22 is slidably mounted on the mounting beam 11 and connected to an output shaft of the traverse motor 21, the pressing assembly 30 and the leveling assembly 40 are both connected to the output shaft of the lift motor 22 and pressed against opposite side walls of the welding seam 108, the leveling assembly 40 is further used for reciprocating under the driving of the traverse motor, to flatten the opposite sidewalls of the weld 108, the welding robot is used to weld the weld 108 of the thin-walled metal tube 100.

When the welding equipment for the thin-wall metal pipe is used for welding, the abutting assembly 30 is firstly utilized to abut against two opposite side walls of the welding seam 108, then the traversing motor is utilized to reciprocate to level the two opposite side walls of the welding seam 108, namely, the side walls of the welding seam 108 exposed at the interval of the abutting assembly 30 are leveled, then the traversing motor is utilized to abut against the two opposite side walls of the welding seam 108, and then the machine welding robot is utilized to weld the welding seam 108 of the thin-wall metal pipe 100.

For example, in order to smooth a projection which may be generated after welding, the tripod 10 includes a triangular base plate 14, a longitudinal beam 15 and two diagonal rods 16, the longitudinal beam 15 is vertically installed at one end of the triangular base plate 14, and the two diagonal rods 16 are respectively installed at opposite sides of the other end of the triangular base plate 14. The top end of the longitudinal beam 15 is mounted at one end of the mounting beam 11, the top ends of the two inclined rods 16 are mounted at the other end of the mounting beam 11, and the distance between the two inclined rods 16 is gradually reduced along the vertical upward direction. The middle part of the longitudinal beam 15 is provided with a rotating motor 155, one end of the suspension shaft 12 is arranged on an output shaft of the rotating motor 155, a clamping member (not shown) is further arranged on the longitudinal beam 15 and used for clamping and positioning the thin-wall metal pipe 100, and the suspension shaft 12 is further used for reciprocating rotation under the driving of the rotating motor 155 so as to polish the bottoms of the two opposite side walls of the welding seam 108 by utilizing the peripheral surface of the suspension shaft, namely polishing after welding. By arranging the suspension shaft 12, after the thin-wall metal pipe 100 is welded, the end part of the thin-wall metal pipe 100 can be clamped by a clamping piece, so that the thin-wall metal pipe 100 cannot rotate, then the suspension shaft 12 is driven to rotate in a reciprocating manner by the rotating motor 155, the circumferential surface of the suspension shaft 12 is used for polishing the welding seam 108 on the inner wall of the thin-wall metal pipe 100, the bottoms of the two opposite side walls of the welding seam 108 are polished, and the flatness is improved.

For example, in order to support the suspension shaft 12 during welding, when the thin-walled metal tube 100 is unloaded after welding, the end of the mounting beam 11 away from the longitudinal beam 15 is rotatably provided with a cantilever 17, the bottom end of the cantilever 17 is transversely provided with a protruding insertion column 175, the end surface of the suspension shaft 12 away from the rotating motor 155 is concavely provided with a circular insertion hole, and the insertion column 175 is used for being inserted into the insertion hole of the suspension shaft 12 to hang the suspension shaft 12. One of the diagonal rods 16 is provided with a free hole for the insertion of the insertion column 175, so that the cantilever 17 can avoid the thin-wall metal pipe 100 for discharging. The mounting beam 11 is parallel to the suspension shaft 12, a guide rail is arranged on the bottom surface of the mounting beam 11, a sliding groove is concavely arranged on the shell of the lifting motor 22, and the guide rail is clamped in the sliding groove to allow the lifting motor 22 to slide along the guide rail. After the loading is finished, the insertion column 175 of the cantilever 17 is inserted into the insertion hole of the suspension shaft 12 to improve the bearing capacity of the suspension shaft 12. When the material needs to be discharged after the welding is finished, the inserting column 175 is pulled out of the inserting hole and inserted into the idle hole of the inclined rod 16, so that the cantilever 17 avoids the thin-wall metal tube 100, the clamping piece loosens the thin-wall metal tube 100, and the thin-wall metal tube 100 can be pulled out along one end far away from the rotating motor 155, so that the discharging operation is completed.

For example, in order to facilitate the installation of the pressing component 30 and the leveling component 40, a rectangular column 221 is fixed on the output shaft of the lifting motor 22, a pressing plate 225 is fixed in the middle of the rectangular column 221, the leveling component 40 includes a cross bar 41, two vertical bars 42 and two leveling frames 45, the middle of the cross bar 41 is vertically fixed at the bottom end of the rectangular column 221, the two vertical bars 42 are respectively vertically fixed at the two opposite ends of the cross bar 41, and the two leveling frames 45 are respectively connected to the bottom ends of the two vertical bars 42 and respectively press against the two opposite side walls of the welding seam 108. Each leveling frame 45 comprises a mounting rod 451, a first comb-shaped structure 453 and a plurality of leveling blocks 455, wherein one end of the mounting rod 451 is vertically fixed at the bottom end of the vertical rod 42, the first comb-shaped structure 453 is mounted at the other end of the mounting rod 451, and the plurality of leveling blocks 455 are respectively mounted on the first comb-shaped structure 453 and abut against the side wall of the welding seam 108. The pressing component 30 includes a rectangular frame 31, two L-shaped rods 32 and two second comb structures 33, the rectangular frame 31 is pressed against the bottom surface of the pressing plate 225, the rectangular frame 31 is provided with strip-shaped guide grooves 315, the rectangular columns 221 are disposed in the strip-shaped guide grooves 315 of the rectangular frame 31, the two L-shaped rods 32 are respectively fixed on two opposite side walls of the rectangular frame 31, the two second comb structures 33 are respectively mounted on the two L-shaped rods 32, and the two second comb structures 33 are respectively located below the two first comb structures 453. The cross bar 41 is fixed at the bottom end of the rectangular column 221, and the rectangular column 221 is inserted into the strip-shaped guide groove 315, so that the traversing motor 21 can be used to drive the rectangular column 221 and the leveling component 40 to move transversely and reciprocally to perform the leveling operation, while the pressing component 30 fixed on the rectangular frame 31 cannot move reciprocally because the rectangular column 221 is bright in the strip-shaped guide groove in the rectangular frame 31 to move horizontally, and cannot drive the rectangular frame 31 to move horizontally, so that after the pressing component 30 presses and positions the thin-walled metal tube 100, the leveling component 40 is used to perform the leveling operation on the two opposite side walls of the welding seam 108.

For example, it is particularly important that the longitudinal direction of the bar-shaped guide groove 315 is parallel to the longitudinal direction of the guide rail, the first comb structure 453 is formed with a plurality of first branches 4531, each of the first branches 4531 is mounted with a leveling block 455, and the upper surface of the leveling block 455 is fixed to the bottom surface of the end of the first branch 4531. A plurality of second branches 331 are formed on the second comb-like structure 33, a pressing block 335 is mounted on the second branches 331, and the side surface of the pressing block 335 is fixed on the end surface of the second branches 331. A leveling interval is formed between every two adjacent pressing blocks 335, and each leveling block 455 is located in the corresponding leveling interval. The size of the leveling block 455 in the axial direction of the suspension shaft 12 is defined as the length of the leveling block 455, and the length of the leveling block 455 is smaller than the width of the leveling interval, so that the leveling block 455 can be reciprocated by the first comb structure 453 to level the side walls of the weld 108 in the leveling interval.

For example, in use, the lifting motor 22 drives the cross bar 41 to move down through the rectangular column 221, so that the two first comb structures 453 drive the leveling blocks 455 to abut against two opposite sidewalls of the welding seam 108, and the pressing plate 225 presses the rectangular frame 31 to move down, so that the two second comb structures 33 drive the pressing blocks to abut against two opposite sidewalls of the welding seam 108. Then the traverse motor 21 drives the lifting motor 22 to move back and forth, and further moves back and forth in the bar-shaped guide groove of the rectangular frame 31 through the rectangular column 221, so that the two first comb structures 453 drive the leveling blocks 455 to move back and forth in the leveling interval to level the two opposite side walls of the welding seam 108, after leveling is completed, the lifting motor 22 further moves down to realize final positioning by using the pressing blocks and the leveling width, that is, to tightly abut the two opposite side walls of the positioning welding seam 108. For example, in order to prevent the two second comb structures 33 from moving along with the leveling action, the lower surface of the pressing plate 225 and the upper surface of the rectangular frame 31 are both smooth surfaces, and the friction force therebetween is insufficient to drive the two second comb structures 33 to move. For example, the thickness of the second comb structure 33 is smaller than the thickness of the first comb structure 453. Because the upper surface of the leveling block 455 is mounted on the lower portion of the end surface of the first comb structure 453, the side surface of the pressing block is mounted on the end portion of the second comb structure 33, and the leveling block 455 and the pressing block are substantially in the same horizontal plane, the second comb structure 33 can be located below the first comb structure 453, so that the installation is convenient, and interference is not easily generated.

For example, in a typical product, before welding, after being pressed by the first comb structure 453, the opposite side walls of the weld 108 are easily pressed against the hanging shaft 12, deformed by the low pressure and thus moved away from each other, and in order to eliminate this condition and to close the weld 108, an inverted U-shaped frame 421 is fixed to the lower portion of each vertical rod 42. A connecting plate 334 is protruded from one end of the second comb-like structure 33, and the connecting plate 334 is inserted into the U-shaped frame 421 and vertically fixed to the bottom end of the L-shaped rod 32. The bottom of the U-shaped frame 421 is provided with a flexible holding plate 422. The flexible abutting plates 422 comprise strip plates 423 and arc-shaped plate bodies 424, the strip plates 423 are fixed at the bottom ends of the U-shaped frames 421, the arc-shaped plate bodies 424 extend downwards from the lower edges of the strip plates 423 in an arc shape, the distance between the arc-shaped plate bodies 424 of the two flexible abutting plates 422 is gradually reduced far from the vertical downward direction, the two flexible plate bodies abut against two opposite side walls of the thin-wall metal pipe 100 to force the thin-wall metal pipe 100 to be tightened, so that the welding seam 108 is closed to wait for subsequent welding, and the welding seam 108 is closed before welding, so that the welding quality is improved.

For example, when loading, firstly, the thin-walled metal tube 100 is sleeved on the suspension shaft 12, then the lifting motor 22 drives the leveling component 40 and the pressing component 30 to move downward, so that the two flexible pressing plates 422 are pressed against the side wall of the thin-walled metal tube 100 and are opened until the two flexible pressing plates 422 pass through the maximum outer diameter of the thin-walled metal tube 100 and descend, and finally, the two flexible pressing plates 422 are pressed against the two opposite sides of the lower portion of the thin-walled metal tube 100, so that the welding seam 108 of the thin-walled metal tube 100 is closed by applying force. When the leveling component 40 is used for leveling the side wall of the welding seam 108 at the leveling interval, the two flexible abutting plates 422 are also used for moving axially in a reciprocating manner relative to the thin-wall metal pipe 100 under the driving of the two U-shaped frames 421, so that the thin-wall metal pipe 100 can move adaptively under the force applied by the two flexible abutting plates 422, the height consistency of the thin-wall metal pipe 100 in the horizontal direction is improved, namely, the position of one end of the lower part of the thin-wall metal pipe 100 higher than the ground is adjusted/corrected, namely, the whole thin-wall metal pipe extends along the horizontal direction without height difference after adjustment, and further, the subsequent welding quality is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A pipe welding device for thin-wall metal pipes is characterized by comprising a tripod, a pressing mechanism and a welding robot, wherein the top of the tripod is provided with an installation beam, the middle part of the tripod is provided with a suspension shaft which is positioned below the installation beam and is used for supporting the thin-wall metal pipes, welding seams of the thin-wall metal pipes face upwards and extend along the length direction of the thin-wall metal pipes, the pressing mechanism comprises a transverse moving motor, a lifting motor, a pressing component and a leveling component, the transverse moving motor is arranged on the installation beam, the lifting motor is slidably arranged on the installation beam and connected to an output shaft of the transverse moving motor, the pressing component and the leveling component are both connected to the output shaft of the lifting motor and pressed on two opposite side walls of the welding seams, and the leveling component is also used for reciprocating under the driving of the transverse moving motor, so as to level the opposite side walls of the weld, and the welding robot is used for welding the weld of the thin-wall metal pipe.

2. The apparatus for welding thin-walled metal pipes according to claim 1, wherein the tripod comprises a triangular base plate, a longitudinal beam vertically installed at one end of the triangular base plate, and two diagonal rods installed at opposite sides of the other end of the triangular base plate, respectively.

3. A tube welding apparatus for thin-walled metal tubes as claimed in claim 2, wherein the top ends of the longitudinal beams are mounted to one end of the mounting beam, the top ends of the two diagonal members are mounted to the other end of the mounting beam, and the distance between the two diagonal members is gradually decreased in a vertically upward direction.

4. The pipe welding apparatus for the thin-walled metal pipe according to claim 3, wherein a rotary motor is installed in the middle of the longitudinal beam, one end of the suspension shaft is installed on an output shaft of the rotary motor, a clamping member is further installed on the longitudinal beam for clamping and positioning the thin-walled metal pipe, and the suspension shaft is further adapted to be reciprocally rotated by the rotary motor to grind the bottom portions of the opposite side walls of the weld by using the peripheral surface thereof.

5. The apparatus for welding thin-walled metal tubes according to claim 4, wherein the mounting beam is rotatably provided with a cantilever at an end thereof remote from the longitudinal beam, the bottom end of the cantilever is laterally provided with a protruding post, the end surface of the suspension shaft remote from the rotating motor is concavely provided with a circular insertion hole, and the protruding post is used for being inserted into the insertion hole of the suspension shaft to hang the suspension shaft.

6. The apparatus for welding thin-walled metal tubes according to claim 5, wherein one of the diagonal members is formed with a free hole for insertion of the stud so that the cantilever arm is kept clear of the thin-walled metal tube for discharge.

7. The apparatus for welding thin-walled metal tubes according to claim 6, wherein the mounting beam is parallel to the suspension shaft, a guide rail is provided on a bottom surface of the mounting beam, a sliding groove is concavely provided on a housing of the elevator motor, and the guide rail is engaged in the sliding groove to allow the elevator motor to slide along the guide rail.

8. The apparatus for welding thin-walled metal tubes according to claim 7, wherein the output shaft of the elevator motor is fixed with a rectangular column, the middle portion of the rectangular column is fixed with a pressing plate, the leveling assembly comprises a cross bar, two vertical bars and two leveling frames, the middle portion of the cross bar is vertically fixed to the bottom end of the rectangular column, the two vertical bars are respectively vertically fixed to the two opposite ends of the cross bar, and the two leveling frames are respectively connected to the bottom ends of the two vertical bars and respectively press against the two opposite side walls of the weld.

9. The apparatus for welding thin-walled metal tubes according to claim 8, wherein each leveling frame comprises a mounting rod, a first comb structure and a plurality of leveling blocks, one end of the mounting rod is vertically fixed to the bottom end of the vertical rod, the first comb structure is mounted to the other end of the mounting rod, and the plurality of leveling blocks are mounted side by side on the first comb structure and abut against the side wall of the weld.

10. The tube welding device for the thin-wall metal tube according to claim 9, wherein the pressing component comprises a rectangular frame, two L-shaped rods and two second comb-shaped structures, the rectangular frame is pressed against the bottom surface of the pressing plate, the rectangular frame is provided with strip-shaped guide grooves, the rectangular columns are inserted into the strip-shaped guide grooves of the rectangular frame, the two L-shaped rods are respectively fixed on two opposite side walls of the rectangular frame, the two second comb-shaped structures are respectively mounted on the two L-shaped rods, and the two second comb-shaped structures are respectively located below the two first comb-shaped structures.