阅读说明：本技术 一种管材拉伸设备 (Pipe stretching equipment ) 是由 唐虎君 曾水林 于 2021-07-01 设计创作，主要内容包括：本发明公开了一种管材拉伸设备,包括机架和拉伸单元,一对拉伸单元可相对移动的设置于机架上,二者相邻近一端分别固定管材的两端用于对管材进行拉伸,拉伸单元包括机尾框架、机身框架、上料装置、夹紧装置和内撑装置,机尾框架通过驱动装置驱动在机架上平移,机身框架通过连接其本体和机尾框架的伸缩油缸驱动与机尾框架相对移动,上料装置用于管材上料并对管材定位,夹紧装置夹持经上料装置送料的管材的外壁,内撑装置与夹紧装置内外夹紧管材,本发明可实现管材自动上下料、两端自动固定、以及自动拉伸,减少人工,可以提高加工效率,避免人员受伤；相对于人工操作,管材上料精度高、夹紧动作更加准确到位,可以提高管材拉伸精准度。(The invention discloses a pipe stretching device, which comprises a rack and stretching units, wherein a pair of stretching units can be arranged on the rack in a relatively movable manner, two adjacent ends of the stretching units are respectively used for fixing two ends of a pipe and stretching the pipe, the stretching units comprise a tail frame, a machine body frame, a feeding device, a clamping device and an inner supporting device, the tail frame is driven by a driving device to translate on the rack, the machine body frame is driven by a telescopic oil cylinder which is connected with a body of the machine body and the tail frame to move relatively to the tail frame, the feeding device is used for feeding the pipe and positioning the pipe, the clamping device clamps the outer wall of the pipe fed by the feeding device, and the inner supporting device and the clamping device clamp the pipe inside and outside; compared with manual operation, the pipe feeding precision is high, the clamping action is more accurate and in place, and the pipe stretching precision can be improved.)

1. A pipe stretching device is characterized by comprising a frame,

a pair of stretching units which can be arranged on the frame in a relatively movable way, the adjacent ends of the stretching units are respectively fixed at the two ends of the pipe for stretching the pipe, the stretching units comprise,

a tail frame which is driven to translate on the frame by a driving device arranged on the body of the tail frame,

the machine body frame is arranged on the machine frame in a translation way and is driven to move relative to the machine tail frame through a telescopic oil cylinder which is connected with the machine body and the machine tail frame,

a feeding device used for feeding and positioning the pipe, the feeding device is arranged on one side of the machine body frame far away from the machine tail frame,

the clamping device comprises a first pressing component and a second pressing component which are arranged on the opposite sides of one end of the machine body frame close to the feeding device, the first pressing component and the second pressing component clamp the outer wall of a pipe fed by the feeding device after moving relatively,

the inner supporting device comprises a base arranged on the machine body frame, at least one first oil cylinder arranged on the base and a supporting head assembly arranged on the first oil cylinder and translated by the first oil cylinder, wherein the supporting head assembly stretches into the pipe through the driving of the first oil cylinder and abuts against the inner wall of the pipe, and the supporting head assembly and the clamping device clamp the pipe internally and externally.

2. The pipe stretching device according to claim 1, wherein the driving device comprises a driving motor and a driving gear, a through spur rack meshed with the driving gear is arranged on the rack, and the driving motor drives the driving gear to move along the through spur rack to drive the tail frame of the motor to translate on the rack.

3. The pipe stretching device according to claim 1, wherein the frame body is provided with a driven gear engaged with the through spur rack, and the telescopic cylinder drives the frame body to translate on the frame along the through spur rack through the driven gear.

4. The pipe stretching device according to any one of claims 1 to 3, wherein rollers are arranged on the tail frame and the body frame, and the rollers abut against the machine frame.

5. The pipe stretching device according to claim 1, wherein the tail frame is provided with a positioning cylinder, the frame is provided with a plurality of positioning holes, and the telescopic end of the positioning cylinder is embedded into the positioning holes to position the tail frame on the frame.

6. The pipe stretching device according to claim 1, wherein the feeding device comprises a mounting plate, a lifting cylinder, a lifting plate, a feeding belt, a translation assembly and a pair of clamping assemblies, the mounting plate is fixed on the frame, the lifting cylinder is arranged on the mounting plate, the lifting plate is arranged at the telescopic end of the lifting cylinder, the feeding belt wound around the body is arranged on the outer side of the lifting plate, the feeding belt is driven by a rotating motor to rotate to feed and discharge the pipes, the translation assembly is arranged on the side wall of the lifting plate, and the translation assembly drives the pair of clamping assemblies to clamp the pipes.

7. The pipe stretching device according to claim 6, wherein the translation assembly comprises a translation motor, a screw nut pair, a translation plate and a translation guide rail pair, the translation plate is slidably arranged on the lifting plate through the translation guide rail pair and is in transmission connection with the translation motor through the screw nut pair; the clamping assembly comprises a clamping cylinder and clamping plates arranged on the clamping cylinder, and the clamping plates are driven to move relatively to clamp the pipe on the feeding belt.

8. The pipe stretching device according to claim 1, wherein the first pressing assembly comprises a pressing cylinder and a pressing toothed belt arranged at the telescopic end of the pressing cylinder, the second pressing assembly comprises a lifting cylinder and a lifting toothed belt arranged at the telescopic end of the lifting cylinder, and the pressing toothed belt and the lifting toothed belt are driven to abut against the upper end and the lower end of the pipe respectively; the lower end surface of the lower pressing toothed belt is arranged in an arc surface shape, and the upper end surface of the lifting toothed belt is arranged in a horizontal shape; the rack is provided with a guide block, the lifting toothed belt can be arranged on the guide block in a vertically sliding mode, and the upper end face of the lifting toothed belt is kept horizontal.

9. The pipe stretching device according to claim 1, wherein the base comprises a translation cylinder and a lower guide rail pair fixed on the frame, the lower guide rail pair is provided with a lower translation plate connected with the translation cylinder in a transmission manner, the lower translation plate is provided with an upper guide rail pair and a translation spur rack, the upper guide rail pair is provided with an upper translation plate, the upper translation plate is provided with a first oil cylinder and a transmission motor, and the transmission motor penetrates through the upper translation plate and then is meshed with the translation spur rack through a rotating gear.

10. The pipe stretching equipment according to claim 1 or 9, wherein the bracing head assembly comprises a second oil cylinder and a bracing head arranged on the second oil cylinder, the bracing head comprises an installation part and an expansion part, the installation part is fixed on a second oil cylinder body, a through hole is arranged on the installation part, a hydraulic rod of the second oil cylinder passes through the through hole and then is connected with the expansion part, the expansion part sequentially comprises a bottom plate, a drive plate and a top plate from bottom to top, the bottom plate is fixed on the installation part, the top plate can be arranged on the installation part in a manner of moving up and down relative to the installation part, the lower end of the top plate is provided with a first inclined surface, the drive plate is connected with the hydraulic rod of the second oil cylinder, the upper end of the drive plate is provided with a second inclined surface, and the drive plate is driven to move by the second oil cylinder and is jacked by the abutting movement of the second inclined surface and the first inclined surface.

Technical Field

The invention relates to the technical field of pipe processing devices, in particular to pipe stretching equipment.

Background

When the pipe is used, the pipe needs to be stretched, adjusted and shaped according to the performance of the pipe in order to adapt to the use working condition. Present pipe stretcher when carrying out the stretching action, needs the operating personnel more than two to install the both ends location of tubular product on tensile equipment, especially to hollow structure's tubular product, like the aluminium alloy, still need install the filler in its cavity to prevent that the stretcher from flattening tubular product when pressing from both sides tight to both ends, this has just resulted in following two aspects problem: when two people operate, the labor intensity is high, the distance is long, and good communication cannot be kept; the filler is arranged in the pipe, so that people are easily injured, and the working efficiency is reduced.

Disclosure of Invention

The invention aims to provide a pipe stretching device which can realize automatic feeding and discharging, automatic fixing of two ends and automatic stretching of pipes, reduce labor, improve processing efficiency and avoid personnel injury; compared with manual operation, the pipe feeding precision is high, the clamping action is more accurate and in place, and the pipe stretching precision can be improved.

In order to achieve the purpose, the invention adopts the technical scheme that: a pipe stretching device comprises a rack and a stretching unit, wherein a pair of stretching units can be arranged on the rack in a relatively movable manner, two adjacent ends of the stretching units are respectively used for fixing two ends of a pipe and stretching the pipe, the stretching unit comprises a tail frame, a machine body frame, a feeding device, a clamping device and an inner support device, the tail frame is driven by a driving device arranged on a body of the tail frame to translate on the rack, the machine body frame is arranged on the rack in a translating manner and is driven by a telescopic oil cylinder connecting the machine body and the tail frame to move relatively to the tail frame, the feeding device is used for feeding the pipe and positioning the pipe, the feeding device is arranged on one side of the machine body frame far away from the tail frame, and the clamping device comprises a first pressing assembly and a second pressing assembly which are arranged on the machine body frame and are close to two opposite sides of one end of the feeding device, the outer wall of the pipe fed by the feeding device is clamped after the pipe and the feeding device move relatively, the internal supporting device comprises a base arranged on the frame of the machine body, at least one first oil cylinder arranged on the base and a supporting head assembly arranged on the first oil cylinder and translated by the first oil cylinder, the supporting head assembly stretches into the pipe through the driving of the first oil cylinder and is abutted against the inner wall of the pipe, and the pipe is clamped between the inside and the outside of the supporting head assembly and the clamping device.

As a further optimization, the driving device comprises a driving motor and a driving gear, a through spur rack meshed with the driving gear is arranged on the rack, and the driving motor drives the driving gear to move along the through spur rack to drive the tail frame to move horizontally on the rack.

As a further optimization, the machine body frame is provided with a driven gear meshed with the through spur rack, and the telescopic oil cylinder drives the machine body frame to translate on the rack along the through spur rack through the driven gear.

As a further optimization, rollers are arranged on the tail frame and the body frame and abut against the rack.

As a further optimization, a positioning cylinder is arranged on the machine tail frame, a plurality of positioning holes are formed in the rack, and the telescopic end of the positioning cylinder is embedded into the positioning holes to position the machine tail frame on the rack.

As a further optimization, the feeding device comprises a mounting plate, a lifting cylinder, a lifting plate, a feeding belt, a translation assembly and a pair of clamping assemblies, wherein the mounting plate is fixed on the rack, the lifting cylinder is arranged on the mounting plate, the lifting plate is arranged at the telescopic end of the lifting cylinder, the feeding belt wound around the body is arranged on the outer side of the lifting plate, the feeding belt is used for driving the rotating motor to rotate to feed and discharge a pipe material, the translation assembly is arranged on the side wall of the lifting plate, and the translation assembly drives the clamping assemblies to clamp the pipe material.

As a further optimization, the translation assembly comprises a translation motor, a screw nut pair, a translation plate and a translation guide rail pair, wherein the translation plate is arranged on the lifting plate in a sliding manner through the translation guide rail pair and is in transmission connection with the translation motor through the screw nut pair; the clamping assembly comprises a clamping cylinder and clamping plates arranged on the clamping cylinder, and the clamping plates are driven to move relatively to clamp the pipe located on the feeding belt.

As a further optimization, the first pressing assembly and the second pressing assembly are respectively arranged at the upper end and the lower end of the machine body frame to form a pressing assembly and a lifting assembly, the pressing assembly comprises a pressing cylinder and a pressing toothed belt arranged at the telescopic end of the pressing cylinder, the lifting assembly comprises a lifting cylinder and a lifting toothed belt arranged at the telescopic end of the lifting cylinder, and the pressing toothed belt and the lifting toothed belt are driven to respectively abut against the upper end and the lower end of the pipe; the lower end surface of the lower pressing toothed belt is arranged in an arc surface shape, and the upper end surface of the lifting toothed belt is arranged in a horizontal shape; the rack is provided with a guide block, the lifting toothed belt can be arranged on the guide block in a vertically sliding mode, and the upper end face of the lifting toothed belt is kept horizontal.

As a further optimization, the base is including being fixed in the translation cylinder in the frame and the lower rail is vice, be equipped with the lower translation board that links to each other with the translation cylinder transmission on the lower rail is vice, be equipped with the vice and the straight rack that translates of upper guide rail on the lower translation board, be equipped with the upper translation board on the upper guide rail is vice, be equipped with first hydro-cylinder and drive motor on the upper translation board, drive motor passes through behind the upper translation board and meshes with the straight rack that translates mutually through rotatory gear.

As further optimization, prop the first subassembly and include the second hydro-cylinder and install the first that props on the second hydro-cylinder, prop the first including installation department and inflation portion, on the installation department was fixed in the second hydro-cylinder body, be equipped with the through-hole on this installation department, the hydraulic stem of second hydro-cylinder passed the through-hole after link to each other with the inflation portion, the inflation portion includes bottom plate, drive plate and roof from bottom to top in proper order, the bottom plate is fixed in on the installation department, what the installation department reciprocated relatively of roof set up on the installation department, the lower extreme of this roof has first inclined plane, the drive plate links to each other with second hydro-cylinder hydraulic stem, and this drive plate upper end has the second inclined plane, and it moves and moves the roof jacking through the butt of second inclined plane and first inclined plane through the drive of second hydro-cylinder.

In addition, the invention can also adjust the up-down relative arrangement of the first compressing component and the second compressing component to be arranged at the horizontal two sides of the frame of the machine body, namely, the left side and the right side are arranged oppositely, and the supporting head is adjusted to be vertical from the horizontal.

Compared with the prior art, the invention has the following beneficial effects:

1. the automatic feeding and discharging device can realize automatic feeding and discharging, automatic fixing of two ends and automatic stretching of the pipe, reduce labor, improve processing efficiency and avoid personnel injury; compared with manual operation, the pipe feeding precision is high, the clamping action is more accurate and in place, and the pipe stretching precision can be improved;

2. the internal supporting device can comprise a plurality of first oil cylinders and supporting head assemblies matched with the first oil cylinders, and is suitable for stretching pipes of different models.

Drawings

FIG. 1 is a block diagram of the present invention.

Fig. 2 is a structural view of the drawing unit of the present invention.

Fig. 3 is a structural diagram of the feeding device of the present invention.

Fig. 4 is a structural view of the clamping device of the present invention.

Fig. 5 is a structural view of the internal stay device of the present invention.

FIG. 6 is a block diagram of the present invention for mounting the spreader bar assembly to the first cylinder.

FIG. 7 is a structural view of the chaplet of the present invention.

FIG. 8 is a structural view of an inflation portion of the present invention.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 to 8, a pipe stretching apparatus comprises a frame 1 and a stretching unit 2, wherein a pair of stretching units 2 is movably arranged on the frame 1, adjacent ends of the stretching units are respectively used for fixing two ends of a pipe 100 for stretching the pipe, the stretching unit 2 comprises a tail frame 31, a body frame 40, a feeding device 41, a clamping device 42 and an inner supporting device 43, the tail frame 31 is driven by a driving device 32 arranged on a body of the tail frame 31 to translate on the frame 1, the body frame 40 is movably arranged on the frame 1, the body frame 40 is driven by a telescopic oil cylinder 33 connected with the body of the body frame and the tail frame 31 to move relative to the tail frame 31, the feeding device 41 is used for feeding and positioning the pipe, the feeding device 41 is arranged on one side of the body frame 40 far away from the tail frame 31, the clamping device 42 comprises a pressing component 421 and a lifting component 422 arranged on an upper end and a lower end of the body frame 40, the inner supporting device 43 comprises a base 431 arranged on the machine body frame 40, at least one first oil cylinder 432 arranged on the base 431, and a supporting head component 433 which is arranged on the first oil cylinder 432 and is translated by the first oil cylinder 432, the supporting head component 433 is driven by the first oil cylinder 432 to extend into the pipe and abut against the inner wall of the pipe, and the supporting head component 433 and the clamping device 42 clamp the pipe inside and outside.

The machine tail frame moves to a designated position, the machine body frame is driven by the telescopic oil cylinder to drive the feeding device to move to the designated position towards one side of the other feeding device, so that the pipe 100 is fed to the position by the pair of feeding devices, then the two ends of the pipe are respectively fixed by two clamping devices, specifically, a lower pressing component is abutted against the outer wall of the upper end of the pipe, a lifting component is abutted against the outer wall of the lower end of the pipe, meanwhile, the first oil cylinder translation supporting head component is abutted against the inner wall of the pipe through the supporting head component, one end of the pipe is firmly fixed through the clamping device and the inner support device, after the action is completed, the telescopic oil cylinder drives the machine body frame to move towards the machine tail frame, the pipe is stretched, after the machine body frame moves to a specified position, the clamping device and the inner support device reset, the stretched pipe is loaded again through the feeding device, and then the blanking of the pipe is completed; be equipped with location cylinder 34 on tail frame 31, be equipped with a plurality of locating holes 14 on the frame 1, the flexible end embedding locating hole 14 of location cylinder 34 is fixed a position tail frame 31 in the frame 1, after tail frame removes the assigned position, before realizing tensile action, can be fixed tail frame in the frame through the locating hole, avoids tail frame to produce the displacement when carrying out tensile action, can improve the tensile precision of tubular product.

The automatic feeding and discharging device can realize automatic feeding and discharging, automatic fixing of two ends and automatic stretching of the pipe, reduce labor, improve processing efficiency and avoid personnel injury; compared with manual operation, the pipe feeding precision is high, the clamping action is more accurate and in place, and the pipe stretching precision can be improved.

The driving device 32 comprises a driving motor 321 and a driving gear 322, and also can be provided with a plurality of driven gears 12, a through spur rack 11 meshed with the driving gear 322 and/or the driven gears 12 is arranged on the rack 1, the driving motor 321 drives the driving gear 322 and/or the driven gears 12 to move along the through spur rack 11 to drive the tail frame 31 of the driving machine to move horizontally on the rack 1, the driven gears 12 meshed with the through spur rack 11 are arranged on the machine frame 40, the telescopic oil cylinder 33 drives the machine frame 40 to move horizontally on the rack 1 along the through spur rack 11 through the driven gears 12, and through the meshing of gears and racks, the moving accuracy of the tail frame and the machine frame can be ensured, so that the pipe stretching accuracy is improved; all be equipped with gyro wheel 13 on tail frame 31 and the fuselage frame 40, gyro wheel 13 butt is in frame 1, can be favorable to tail frame and fuselage frame comparatively smooth and easy the translation of carrying on in the frame.

The feeding device 41 comprises a mounting plate 411, a lifting cylinder 412, a lifting plate 413, a feeding belt 4142, a translation assembly and a pair of clamping assemblies, the mounting plate 411 is fixed on the rack 1, the lifting cylinder 412 is arranged on the mounting plate 411, the lifting plate 413 is arranged at the telescopic end of the lifting cylinder 412, meanwhile, a guide rail pair is arranged on the mounting plate to realize smooth and accurate movement of the lifting plate, the feeding belt 4142 which winds up the body is arranged on the outer side of the lifting plate 413, the feeding belt 4142 drives the feeding and discharging pipe 100 to rotate through a rotating motor 4141, the translation assembly is arranged on the side wall of the lifting plate, and the translation assembly drives the pair of clamping assemblies to clamp the pipe; the translation assembly comprises a translation motor 4151, a screw nut pair 4152, a translation plate 4161 and a translation guide rail pair 4162, wherein the translation plate 4161 is arranged on the lifting plate 413 in a sliding manner through the translation guide rail pair 4162 and is in transmission connection with the translation motor 4151 through the screw nut pair 4152; the clamping assembly comprises a clamping cylinder 4171 and a clamping plate 4172 arranged on the clamping cylinder 4171, and the pair of clamping plates 4172 are driven to move relatively to clamp the pipe on the feeding belt 4142.

The tubular product carries out the material loading through the pay-off of material loading area, after response tubular product targets in place, translation motor drive translation board adjustment targets in place, the die clamping cylinder that is located on the translation board drives die clamping plate and presss from both sides tight tubular product and fix its position, the one end of tubular product is located between pushing down subassembly and the lifting subassembly this moment, rise to the assigned position through lift cylinder drive lifter plate, can make and push down the subassembly and the action back clamp pipe material outer wall of lifting subassembly, and make interior strutting arrangement action back butt in the tubular product inner wall, then, loading attachment can reset, carry out the unloading after waiting for the tensile completion of tubular product.

A feeding guide plate 49 and a discharging guide plate (located on the opposite side of the feeding guide plate) may be respectively disposed on both sides of the body frame 40 to assist the pipes in feeding and discharging.

The pressing component 421 comprises a pressing cylinder 4211 and a pressing toothed belt 4212 arranged at the telescopic end of the pressing cylinder 4211, the lifting component 422 comprises a lifting cylinder 4221 and a lifting toothed belt 4222 arranged at the telescopic end of the lifting cylinder 4221, and the pressing toothed belt 4212 and the lifting toothed belt 4222 are driven to respectively abut against the upper end and the lower end of the pipe; the lower end surface of the lower pressing toothed belt 4212 is arc-surface-shaped, and the upper end surface of the lifting toothed belt 4222 is horizontal; the rack 1 is provided with a guide block 4223, the lifting toothed belt 4222 is provided with an inclined sliding groove 42221, the guide block is embedded into the inclined sliding groove, the lifting toothed belt can be arranged on the guide block in a vertically sliding mode, and the upper end face of the lifting toothed belt is kept horizontal.

The friction force can be increased through the contact of the toothed belt and the outer wall of the pipe, and the clamping firmness is ensured; the upper end surface of the lifting toothed belt is always kept in a horizontal state, a large area of the lifting toothed belt can be contacted with the outer wall of the lower end of the pipe, and the lower pressing toothed belt is abutted against the outer wall of the upper end of the pipe after rotating in an arc shape; when the pressing assembly and the lifting assembly perform clamping action, the inner supporting device synchronously acts.

The base 431 comprises a translation cylinder 4311 and a lower guide rail pair 4313 which are fixed on the frame 1, the lower guide rail pair 4313 is provided with a lower translation plate 4312 which is in transmission connection with the translation cylinder 4311, the lower translation plate 4312 is provided with an upper guide rail pair 4314 and a translation spur rack 4317, the upper guide rail pair 4314 is provided with an upper translation plate 4315, the upper translation plate 4315 is provided with a first oil cylinder 432 and a transmission motor 4316, and the transmission motor 4316 penetrates through the upper translation plate 4315 and then is meshed with the translation spur rack 4317 through a rotating gear; the support head assembly 433 comprises a second oil cylinder 434 and a support head 435 mounted on the second oil cylinder 434, the support head 435 comprises a mounting part 436 and an expansion part 437, the mounting part 436 is fixed on the body of the second oil cylinder 434, a through hole 4360 is arranged on the mounting part 436, the hydraulic rod of the second oil cylinder 434 passes through the through hole 4360 and then is connected with the expansion part 437, the expansion part 437 sequentially comprises a bottom plate 4371, a drive plate 4372 and a top plate 4373 from bottom to top, the bottom plate 4371 is fixed on the mounting part 436, the top plate 4373 is arranged on the mounting part 436 and can move up and down relative to the mounting part 436, the lower end of the top plate 4373 is provided with a first inclined surface, the drive plate 4372 is connected with the hydraulic rod of the second oil cylinder 434, and the upper end of the drive plate 4372 is provided with a second inclined surface which is driven by the second oil cylinder 434 to move and pushes up the top plate 4373 by the abutting movement of the second inclined surface and the first inclined surface.

According to the pipe inner wall bracing device, the number of the first oil cylinders can be at least two, the number of the second oil cylinders is matched with that of the first oil cylinders, the output ends of the first oil cylinders are respectively provided with two bracing heads with the same structure and different sizes, when the inner wall of a pipe is braced, the translation air cylinders drive the lower translation plate to move in place, the driving motor acts according to the type of an upper pipe, the bracing heads matched with the type of the pipe are aligned to the inner cavity of the pipe through the movement of the upper translation plate, the first oil cylinders drive the second oil cylinders to drive the bracing heads to extend into the pipe, after the first oil cylinders move in place, the bottom plate or the second oil cylinders abut against the inner wall of the lower end of the pipe, the second oil cylinders drive the driving plate to move forwards through the hydraulic cylinders of the second oil cylinders, the second inclined planes of the driving plate push the first inclined planes of the top plate, and the top plate is lifted and abutted against the inner wall of the upper end of the pipe by utilizing the movement between the inclined planes to generate a height difference, and the bracing heads to brace the inner wall of the pipe.

The specific structure of the support head is as follows: the mounting part 436 comprises a mounting block 4361 and a pair of side plates 4362 arranged at two opposite sides of the mounting block 4361, and the through hole 4360 is arranged on the mounting block 4361; the lower part of the side plate 4362 is provided with a locking hole 4381, and the bottom plate 4371 is fixed on the side plate by a first bolt 4382 passing through the body and the locking hole 4381; the upper portion of the side plate 4362 is provided with a positioning hole 4383, the top plate 4373 is provided with at least two vertical waist holes 43731, the top plate 4373 is arranged on the side plate 4362 to be capable of moving up and down through a second bolt 4384 penetrating through the waist holes 43731 and the positioning hole 4383, and the top plate is lifted up through the inclined plane due to the movement of the driving plate, namely, the lifting of the position of the top plate is realized by the height of the waist holes.

The height of the drive plate 4372 gradually decreases in a direction away from the mounting portion 436; the top plate 4373 has a guide inclined surface 43732 on the side far from the mounting part 436, so that the support head can easily extend into the tube.

The upper end surface of the lifting toothed belt and the upper end surface of the top plate are planar, so the lifting toothed belt is particularly suitable for the pipe with the upper end surface and the lower end surface being planar, such as the pipe with the rectangular or square cross section.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.