CN111097959B

CN111097959B - Tubular product cutting equipment convenient to adjust

Info

Publication number: CN111097959B
Application number: CN202010013131.9A
Authority: CN
Inventors: 李红兵
Original assignee: Suzhou Futeng Intelligent Technology Co ltd
Current assignee: JILIN KAIDA PIPE Co.,Ltd.
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2021-04-09
Anticipated expiration: 2040-01-07
Also published as: CN113145928A; CN111097959A

Abstract

The invention discloses a pipe cutting device convenient to adjust, which structurally comprises a handle, a support plate, a cutting machine, a cutting piece and an adjustable cutting external hanging device, and has the following effects: the adjustable cutting plug-in device is by left spacing alignment jig, remove the measuring seat and adjust and remove the fore-stock and the spacing alignment jig in the right side is constituteed, the cutting machine is under the regulation structure effect that the adjustable cutting plug-in device formed, can be through the structure of holding that handle and extension board formed, handheld cutting machine carries out stable removal at the square pipe top surface of different width, and utilize the cutting piece to accomplish the cutting location to the cutting piece automatically in the square pipe cutting process at the cutting machine, the tangent plane that makes square pipe form after the cutting keeps leveling, simultaneously with square pipe remain parallel scale throughout in the removal, can carry out the fly-cutting to the square pipe of required length, thereby improve the efficiency of the section equidistance cutting one by one of square pipe greatly.

Description

Tubular product cutting equipment convenient to adjust

Technical Field

The invention relates to the field of cutting equipment, in particular to pipe cutting equipment convenient to adjust.

Background

With the development of modern machining industry, the requirements for cutting quality and precision are continuously improved, the requirements for improving production efficiency, reducing production cost and facilitating adjustment of cutting function are also improved, the pipe can be divided into round pipes, square pipes, triangular pipes and the like according to the shapes of sections, in some specific construction sites, a longer square pipe needs to be cut and processed into a plurality of small square pipes with equal distances, the common construction mode is that firstly, the longer square pipe is marked section by section after being measured, then, the marked square pipe is cut section by using a handheld cutting machine, the processing mode of cutting the square pipe section by section with equal distances greatly reduces the cutting efficiency of the square pipe, meanwhile, the stability is poor in the cutting process, the smoothness of the section of the square pipe cannot be guaranteed, and therefore, the pipe cutting equipment facilitating adjustment needs to be developed, the problem of at some specific job sites, a longer square pipe needs to be cut into a plurality of equidistant little square pipes, and the mark is done to the first section one by one after measuring on longer square pipe to the usual construction methods, then utilizes handheld cutting machine to cut the square pipe section by section of doing the mark, and this kind of processing method that the square pipe section by section equidistance cutting is carried out to the square pipe, greatly reduced the cutting efficiency of square pipe, poor stability in the cutting process simultaneously, can not guarantee the tangent plane of square pipe and smooth problem.

Disclosure of Invention

Aiming at the defects of the prior art, the invention is realized by the following technical scheme: the pipe cutting equipment convenient to adjust structurally comprises a handle, a supporting plate, a cutting machine, a cutting blade and an adjustable cutting plug-in device, wherein the supporting plate is arranged at the center of the top of the adjustable cutting plug-in device, the supporting plate is movably connected with the adjustable cutting plug-in device, the handle is arranged at the top of the supporting plate and is welded and fixed on the supporting plate, the cutting machine is arranged at the bottom of the supporting plate, the cutting machine and the supporting plate are in interference fit, the cutting blade is arranged at the bottom of the cutting machine, and the cutting blade is in transmission connection with the cutting machine.

As a further optimization of the technical scheme, the adjustable cutting plug-in device is composed of a left limit adjusting frame, a movable measuring seat, an adjusting movable front frame and a right limit adjusting frame, the adjusting movable front frame is arranged at the front end of the movable measuring seat and is installed on the movable measuring seat, the left limit adjusting frame and the right limit adjusting frame are arranged on two sides of the movable measuring seat, and the left limit adjusting frame and the right limit adjusting frame are vertically installed on the movable measuring seat.

As the further optimization of this technical scheme, the spacing alignment jig in a left side constitute by locating pin, slider, grooved bar, activity knee, branch, spacing sliding sleeve, location cushion, the grooved bar on be equipped with the slider, slider and grooved bar adopt sliding fit, grooved bar top be equipped with the locating pin, locating pin and grooved bar adopt interference fit, grooved bar one side be equipped with the activity knee, the activity knee be connected with the slider, activity knee bottom be equipped with branch, branch and activity knee adopt sliding fit, branch middle section position be equipped with spacing sliding sleeve, spacing sliding sleeve and branch outer lane adopt sliding fit, the branch bottom be equipped with the location cushion, location cushion and branch connect.

As the further optimization of this technical scheme, the removal measure seat constitute by support, back gyro wheel, cut groove, scale, support rear end central point put and be equipped with the back gyro wheel, back gyro wheel and support pass through the wheel carrier and connect, support top central point put and be equipped with and cut the groove, cut groove and support structure as an organic whole, the support front end be equipped with the scale.

As a further optimization of the technical scheme, the adjusting and moving front frame consists of an adjusting rod, a sliding rail, a left corner wheel and a right corner wheel, the sliding rail is arranged above the adjusting rod, the adjusting rod is matched with the sliding rail, the left corner wheel and the right corner wheel are arranged below the adjusting rod, and the left corner wheel and the right corner wheel are matched with the adjusting rod.

As the further optimization of the technical scheme, the adjusting rod consists of a left ball nut, a left screw rod, a turntable, a right screw rod, a right ball nut and a bearing seat, the two ends of the turntable are provided with the left screw rod and the right screw rod, the left screw rod and the right screw rod are fixedly connected with the turntable, the bearing seat is arranged at one end of the left screw rod and one end of the right screw rod, the left screw rod is provided with the left ball nut, the left ball nut is matched with the left screw rod, the right screw rod is provided with the right ball nut, and the right ball nut is matched with the right screw rod.

As a further optimization of the technical scheme, the left limiting adjusting frame and the right limiting adjusting frame are in an axisymmetrical structure by the symmetry axis of the support plate.

As a further optimization of the technical scheme, the left screw and the right screw are in an axisymmetric structure by using a symmetry axis of the turntable.

Advantageous effects

The pipe cutting equipment convenient to adjust is reasonable in design and strong in functionality, and has the following beneficial effects:

the adjustable cutting plug-in device comprises a left limit adjusting frame, a movable measuring seat, an adjustable movable front frame and a right limit adjusting frame, wherein the cutting machine can be held by a holding structure formed by a handle and a support plate under the action of an adjusting structure formed by the adjustable cutting plug-in device to stably move the top surfaces of square pipes with different widths, and can automatically complete cutting and positioning of cutting pieces in the cutting process of the square pipes by the cutting machine by utilizing the cutting pieces, so that cut surfaces formed after the square pipes are cut are kept flat, and meanwhile, the square pipes with required lengths can be quickly cut by a graduated scale which is always parallel to the square pipes in the moving process, so that the efficiency of equidistant cutting of the square pipes section by section is greatly improved;

according to the invention, a holding structure consisting of a handle and a support plate is in sliding fit with a left limit adjusting frame and a right limit adjusting frame, a sliding block is matched with a positioning pin, and a rubber layer surrounded by an outer ring of the positioning pin and a matching structure formed by a circular notch at the top of the sliding block are utilized;

because the slide block is connected with the movable bent rod, and the movable bent rod is connected with the supporting rod in a sliding manner, a force is vertically applied to the handle downwards, so that the cutting machine slides downwards along the groove rod through the supporting plate, when the cutting machine moves to two thirds of the groove rod, the movable bent rod goes deep into the limiting end at the bottom of the supporting rod and pushes the supporting rod to move downwards along the limiting sliding sleeve, so that the positioning rubber pad is contacted with the ground or the wall surface to finish positioning, and at the moment, the cutting machine drives the cutting piece to slide downwards along the supporting plate under the action of the continuously generated downward force to cut the square pipe, so that the stability in cutting the square pipe is improved, and;

according to the invention, the left corner wheel and the right corner wheel position adjusting structure formed by the left ball nut, the left screw rod, the rotary disc, the right screw rod and the right ball nut rotate along the lead of the rotary disc in a clockwise manner, and respectively drive the left ball nut and the right ball nut to slide along the slide rail and approach the rotary disc, at the moment, the distance between the left corner wheel and the right corner wheel is shortened, the rotary disc rotates anticlockwise, the distance between the left corner wheel and the right corner wheel is lengthened, the left corner wheel and the right corner wheel can respectively realize sliding fit with two right angles at the top of the square pipe through the moving structure formed by the left corner wheel and the right corner wheel, the square pipe moving structure is formed by the left corner wheel, the right corner wheel and the rear roller, and stable movement on the top surfaces of the square pipes with different widths can be realized after the rotary disc is used for rotation adjustment.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic front view of a tube cutting apparatus of the present invention that is easily adjustable;

FIG. 2 is a front view of the adjustable cutting plug-in device of the present invention;

FIG. 3 is a schematic side sectional view of the left limiting adjustment bracket of the present invention;

FIG. 4 is a schematic top view of the movable measuring stand of the present invention;

FIG. 5 is a front view of the adjustable front mount according to the present invention;

fig. 6 is a front view of the adjusting rod of the present invention.

In the figure: a handle-1, a support plate-2, a cutting machine-3, a cutting blade-4, an adjustable cutting plug-in device-5, a left limit adjusting frame-51, a positioning pin-51 a, a slide block-51 b, a groove rod-51 c, a movable bent rod-51 d, a support rod-51 e, a limit sliding sleeve-51 f, a positioning rubber pad-51 g, a movable measuring seat-52, a support seat-52 a, a rear roller-52 b, a cutting groove-52 c, a graduated scale-52 d, an adjusting movable front frame-53, an adjusting rod-53 a, a left ball nut-53 a1, a left screw rod-53 a2, a turntable-53 a3, a right screw rod-53 a4, a right ball nut-53 a5, a bearing seat-53 a6, a slide rail-53 b, a left angle wheel-53 c, a rear roller-53 b, a rear roller, A right angle wheel-53 d and a right limit adjusting bracket-54.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the following description and the accompanying drawings further illustrate the preferred embodiments of the invention.

Example 1

Referring to fig. 1-4, the present invention provides an embodiment of a tube cutting apparatus that is easy to adjust:

referring to fig. 1, the pipe cutting equipment convenient to adjust structurally comprises a handle 1, a support plate 2, a cutting machine 3, a cutting blade 4 and an adjustable cutting plug-in device 5, wherein the support plate 2 is arranged at the center of the top of the adjustable cutting plug-in device 5, the support plate 2 is movably connected with the adjustable cutting plug-in device 5, the handle 1 is arranged at the top of the support plate 2, the handle 1 is fixedly welded on the support plate 2, the cutting machine 3 is arranged at the bottom of the support plate 2, the cutting machine 3 and the support plate 2 are in interference fit, the cutting blade 4 is arranged at the bottom of the cutting machine 3, and the cutting blade 4 is in transmission connection with the cutting machine 3.

Referring to fig. 2, the adjustable cutting plug-in device 5 is composed of a left limit adjusting frame 51, a movable measuring seat 52, an adjusting movable front frame 53 and a right limit adjusting frame 54, the adjusting movable front frame 53 is arranged at the front end of the movable measuring seat 52, the adjusting movable front frame 53 is installed on the movable measuring seat 52, the left limit adjusting frame 51 and the right limit adjusting frame 54 are arranged on two sides of the movable measuring seat 52, the left limit adjusting frame 51 and the right limit adjusting frame 54 are vertically installed on the movable measuring seat 52, and the left limit adjusting frame 51 and the right limit adjusting frame 54 are in an axial symmetry structure with the symmetry axis of the support plate 2.

Referring to fig. 3, the left limit adjusting bracket 51 is composed of a positioning pin 51a, a slider 51b, a slot rod 51c, a movable bent rod 51d, a supporting rod 51e, a limit sliding sleeve 51f and a positioning rubber pad 51g, the slot rod 51c is provided with the slider 51b, the slider 51b and the slot rod 51c are in sliding fit, the top end of the slot rod 51c is provided with the positioning pin 51a, the positioning pin 51a and the slot rod 51c are in interference fit, one side of the slot rod 51c is provided with the movable bent rod 51d, the movable bent rod 51d is in an L-shaped structure, the top end of the movable bent rod 51b is connected with the slider 51b, the bottom end of the movable bent rod 51d is provided with the supporting rod 51e, the supporting rod 51e is in a hollow cylindrical structure and is in sliding fit with the movable bent rod 51d, the middle section of the supporting rod 51e is provided with the limit sliding sleeve 51f, the outer ring of the limit sliding sleeve 51f is, the bottom end of the supporting rod 51e is provided with a positioning rubber pad 51g, and the positioning rubber pad 51g is connected with the supporting rod 51 e.

Referring to fig. 4, the movable measuring seat 52 is composed of a support 52a, a rear roller 52b, a cutting groove 52c and a graduated scale 52d, the rear roller 52b is arranged at the center of the rear end of the support 52a, the rear roller 52b is connected with the support 52a through a wheel carrier, the cutting groove 52c is arranged at the center of the top of the support 52a, the cutting groove 52c and the support 52a are of an integrated structure, two graduated scales 52d are arranged at the front end of the support 52a in parallel and at equal intervals, the graduated scale 52d is horizontally arranged on the support 52a, and the support 52a is connected with a support rod 51e through a limiting sliding sleeve 51 f.

The positioning pin 51a is of a cylindrical structure, the rubber layer is surrounded by the outer ring of the positioning pin 51a, a circular notch is formed in the center of the top of the sliding block 51b, and the diameter of the circumference formed by the circular notch is slightly smaller than that of the circumference formed by the positioning pin 51 a.

When the cutting machine is used, a holding structure consisting of the handle 1 and the support plate 2 is in sliding fit with the left limiting adjusting frame 51 and the right limiting adjusting frame 54, the sliding block 51b is matched with the positioning pin 51a, the rubber layer surrounded by the outer ring of the positioning pin 51a and the matching structure formed by the circular notch at the top of the sliding block 51b are utilized, the characteristic that the rubber layer can generate large deformation under the action of external force is utilized, the positioning pin 51a enters the circular notch by upward force application, the positioning effect on the cutting machine 3 can be achieved, the situation that the cutting machine 3 drives the cutting blade 4 to slide downwards under the action of gravity when not used is avoided, because the sliding block 51b is connected with the movable bent rod 51d, the movable bent rod 51d is in sliding connection with the support rod 51e, the force is vertically downwards applied to the handle 1, the cutting machine 3 slides downwards along the grooved rod 51c through the support plate 2, when the cutting, the movable bent rod 51d goes deep into the bottom limiting end of the supporting rod 51e, and pushes the supporting rod 51e to move downwards along the limiting sliding sleeve 51f, so that the positioning rubber pad 51g is in contact with the ground or the wall surface to complete positioning, and the cutting machine 3 drives the cutting sheet 4 to slide downwards along the supporting plate 2 under the action of the downward pressure generated continuously at the moment to cut the square pipe, so that the stability in cutting the square pipe is improved, and the flatness of the cut surface is improved.

Example 2

Referring to fig. 1-6, the present invention provides an embodiment of a tube cutting apparatus that is easy to adjust:

Referring to fig. 5, the adjusting movable front frame 53 is composed of an adjusting rod 53a, a sliding rail 53b, a left corner wheel 53c and a right corner wheel 53d, the sliding rail 53b is arranged above the adjusting rod 53a, the sliding rail 53b and the adjusting rod 53a are parallel to each other, the adjusting rod 53a is matched with the sliding rail 53b, the left corner wheel 53c and the right corner wheel 53d are arranged below the adjusting rod 53a, and the left corner wheel 53c and the right corner wheel 53d are matched with the adjusting rod 53 a.

Referring to fig. 6, the adjusting rod 53a is composed of a left ball nut 53a1, a left screw 53a2, a turntable 53a3, a right screw 53a4, a right ball nut 53a5 and a bearing seat 53a6, two ends of the turntable 53a3 are provided with a left screw 53a2 and a right screw 53a4, the left screw 53a2 and the right screw 53a4 are fixedly connected with the turntable 53a3, one ends of the left screw 53a2 and the right screw 53a4 are provided with the bearing seat 53a6, the left screw 53a2 and the right screw 53a4 are mounted at the front end of the support 52a through the bearing seat 53a6, the left screw 53a2 is provided with a left ball nut 53a1, the left ball nut 53a1 is matched with the left screw 53a2, the right screw 53a4 is provided with a right ball nut 53a5, and the right ball nut 3953 a5 is matched with the right screw 3953 a 4.

The left corner wheel 53c is obliquely arranged on the left ball nut 53a1 through a wheel frame, the right corner wheel 53d is obliquely arranged on the right ball nut 53a5 through the wheel frame, the left corner wheel 53c and the right corner wheel 53d are in an axisymmetric structure with the symmetric axis of the turntable 53a3, and the wheel body and the wheel rim structures of the left corner wheel 53c and the right corner wheel 53d are in a V shape.

The left screw 53a2, the right screw 53a4 and the turntable 53a3 are arranged on the same straight line, the top of the left ball nut 53a1 is in sliding fit with the slide rail 53b, and the top of the right ball nut 53a5 is in sliding fit with the slide rail 53 b.

In use, in combination with the first embodiment, the left and right

angular wheels

53c and 53d formed by the left ball nut 53a1, the left and right screws 53a2, the turntable 53a3, the right screw 53a4, and the right ball nut 53a5 are configured to adjust the position thereof, the turntable 53a3 is rotated clockwise, the left and right screws 53a2 and 53a4 rotate with the lead of the rotation of the turntable 53a3, and the left and right ball nuts 53a1 and 53a5 are respectively driven to slide along the slide rail 53b toward the turntable 53a3, the distance between the left and right

angular wheels

53c and 53d is shortened, the turntable 53a3 is rotated counterclockwise, the distance between the left and right

angular wheels

53c and 53d is lengthened, the left and right

angular wheels

53c and 53d are configured to be slidably engaged with the two right angular wheels at the top of the square tube, and the left and right

angular wheels

53c and 53d are configured to be moved by the left and right

angular wheels

53c and 53b, after the rotation adjustment by the turntable 53a3, stable movement on the top surfaces of square pipes of different widths can be realized.

The specific realization principle is as follows:

under the action of an adjusting structure formed by the adjustable cutting plug-in device 5, the cutting machine 3 can stably move on the top surfaces of square pipes with different widths through a holding structure formed by the handle 1 and the support plate 2, and the cutting machine 3 can automatically complete cutting and positioning of the cutting sheet 4 in the process of cutting the square pipes by using the cutting sheet 4, so that the cut surfaces formed after the square pipes are cut are kept flat, meanwhile, the scale 52d which is always parallel to the square pipes in movement can quickly cut the square pipes with required length, thereby greatly improving the efficiency of the section-by-section equidistant cutting of the square pipes, because the left ball nut 53a1, the left screw 53a2, the turntable 53a3, the right screw 53a4 and the left angle wheel 53c and the right angle wheel 53d position adjusting structure formed by the right ball nut 53a5 rotate the turntable 53a3 clockwise, the left screw 53a2 and the right screw 53a4 rotate along with the rotation of the turntable 53a3, and respectively drive the left ball nut 53a1 and the right ball nut 53a5 to slide along the slide rail 53b to approach the turntable 53a3, at this time, the distance between the left corner wheel 53c and the right corner wheel 53d is shortened, the turntable 53a3 is rotated counterclockwise, the distance between the left corner wheel 53c and the right corner wheel 53d is lengthened, the left corner wheel 53c and the right corner wheel 53d can respectively realize sliding fit with two right angles at the top of the square tube through the moving structure formed by the left corner wheel 53c and the right corner wheel 53d, the square tube moving structure is formed by the left corner wheel 53c, the right corner wheel 53d and the rear roller 52b, stable movement on the top of the square tubes with different widths can be realized after the rotation adjustment by the turntable 53a3, because the holding structure formed by the handle 1 and the support plate 2 is in sliding fit with the left limit adjusting bracket 51 and the right limit adjusting bracket 54, and the slide block 51b is matched with the positioning pin 51a, by means of a matching structure formed by a rubber layer surrounded by the outer ring of the positioning pin 51a and a circular notch at the top of the sliding block 51b, the characteristic that the rubber layer can generate large deformation under the action of external force is utilized, the positioning pin 51a can play a positioning role for the cutting machine 3 after entering the circular notch by applying force upwards, the cutting machine 3 is prevented from driving the cutting blade 4 to slide downwards under the action of gravity when the cutting machine 3 is not used, because the sliding block 51b is connected with the movable bent rod 51d, and the movable bent rod 51d is connected with the supporting rod 51e in a sliding manner, the force is vertically applied to the handle 1 downwards to enable the cutting machine 3 to slide downwards along the grooved rod 51c through the supporting plate 2, when the cutting machine 3 moves to two thirds of the grooved rod 51c, the movable bent rod 51d goes deep into the limiting end at the bottom of the supporting rod 51e and pushes the supporting rod 51e to move downwards along the, cutting machine 3 is under the effect of the lower pressure that continues to produce this moment, drive cutting piece 4 and slide downwards along extension board 2, the square pipe is cut, solve at some specific job sites with this, a longer square pipe need be cut into a plurality of equidistance little square pipes, the mark is done to the segmentation after at first measuring on longer square pipe to the usual construction methods, then utilize handheld cutting machine will be done the square pipe of mark and cut segment by segment, this kind of processing method that the square pipe is cut segment by segment equidistance, greatly reduced the cutting efficiency of square pipe, poor stability in the cutting process simultaneously, can not guarantee the smooth problem of the tangent plane of square pipe.

While there have been shown and described what are at present considered the fundamental principles of the invention, the essential features and advantages thereof, it will be understood by those skilled in the art that the present invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but rather, is capable of numerous changes and modifications in various forms without departing from the spirit or essential characteristics thereof, and it is intended that the invention be limited not by the foregoing descriptions, but rather by the appended claims and their equivalents.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a tubular product cutting equipment convenient to adjust, its structure includes handle (1), extension board (2), cutting machine (3), cutting piece (4), adjustable cutting plug-in device (5), its characterized in that:

a support plate (2) is arranged at the top of the adjustable cutting plug-in device (5), a handle (1) is arranged at the top of the support plate (2), a cutting machine (3) is arranged at the bottom of the support plate (2), and a cutting blade (4) is arranged at the bottom of the cutting machine (3);

the adjustable cutting plug-in device (5) consists of a left limit adjusting frame (51), a movable measuring seat (52), an adjusting movable front frame (53) and a right limit adjusting frame (54), wherein the adjusting movable front frame (53) is arranged at the front end of the movable measuring seat (52), and the left limit adjusting frame (51) and the right limit adjusting frame (54) are arranged on two sides of the movable measuring seat (52);

the left limiting adjusting frame (51) consists of a positioning pin (51a), a sliding block (51b), a groove rod (51c), a movable bent rod (51d), a support rod (51e), a limiting sliding sleeve (51f) and a positioning rubber pad (51g), the sliding block (51b) is arranged on the groove rod (51c), the positioning pin (51a) is arranged at the top end of the groove rod (51c), the movable bent rod (51d) is arranged on one side of the groove rod (51c), the support rod (51e) is arranged at the bottom end of the movable bent rod (51d), the limiting sliding sleeve (51f) is arranged at the middle section of the support rod (51e), and the positioning rubber pad (51g) is arranged at the bottom end of the support rod (51 e);

the movable measuring seat (52) consists of a support (52a), a rear roller (52b), a cutting groove (52c) and a graduated scale (52d), the rear end of the support (52a) is provided with the rear roller (52b), the top of the support (52a) is provided with the cutting groove (52c), and the front end of the support (52a) is provided with the graduated scale (52 d);

the adjusting movable front frame (53) consists of an adjusting rod (53a), a sliding rail (53b), a left corner wheel (53c) and a right corner wheel (53d), the sliding rail (53b) is arranged above the adjusting rod (53a), and the left corner wheel (53c) and the right corner wheel (53d) are arranged below the adjusting rod (53 a);

the adjusting rod (53a) is composed of a left ball nut (53a1), a left screw rod (53a2), a turntable (53a3), a right screw rod (53a4), a right ball nut (53a5) and a bearing seat (53a6), the two ends of the turntable (53a3) are provided with a left screw rod (53a2) and a right screw rod (53a4), one ends of the left screw rod (53a2) and the right screw rod (53a4) are provided with a bearing seat (53a6), the left screw rod (53a2) is provided with a left ball nut (53a1), the right screw rod (53a4) is provided with a right ball nut (53a5), the left limiting adjusting frame (51) and the right limiting adjusting frame (54) are in an axial symmetry structure with the symmetry axis of the support plate (2), and the left screw rod (53a2) and the right screw rod (53a4) are in an axial symmetry structure with the symmetry axis of the turntable (53a 3).