CN211110598U

CN211110598U - Secondary clamping and positioning device for peripheral lifting appliance of vehicle body

Info

Publication number: CN211110598U
Application number: CN201921325903.1U
Authority: CN
Inventors: 黄立志
Original assignee: Shanghai Well Ideal Industrial Automation Co ltd
Current assignee: Shanghai Well Ideal Industrial Automation Co ltd
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2020-07-28
Anticipated expiration: 2029-08-15

Abstract

Peripheral for hoist secondary clamp positioner of automobile body includes: the lifting appliance comprises a lifting rod, a lifting lug and a lifting appliance positioning frame fixed with the lifting lug, and the secondary positioning structure comprises a positioning support, a positioning guide block and a clamping device; the lifting appliance positioning frame is formed by placing three supports along a triangular position, the clamping cylinder drives the clamping arms to fix the lifting rods in the positioning guide blocks to realize secondary positioning of the lifting appliance, the positioning accuracy of the lifting appliance is improved, the primary positioning of the friction trolley and the secondary positioning of the lifting appliance can meet the requirements of the positioning accuracy of the upper line and the lower line of the periphery of an automobile body and the positioning accuracy of the grabbing of parts by a robot, the automation degree of an automobile production assembly line is greatly improved, and the production efficiency is improved; moreover, the secondary clamping and positioning device is simple in structure, convenient to install and easy to realize in overhauling operation.

Description

Secondary clamping and positioning device for peripheral lifting appliance of vehicle body

Technical Field

The utility model relates to a car factory automobile body peripheral friction line technical field specifically is peripheral for hoist secondary clamp positioning device of automobile body.

Background

The friction line of an automobile factory is used for conveying workpieces on the periphery of a vehicle body, the periphery of the vehicle body is used for loading and unloading, and a robot is used for grabbing the workpieces, and the workpieces can be applied to the friction line only by accurately positioning the workpieces. During operation, the friction trolley is in place, the clamping device clamps the friction trolley to perform primary positioning, but the positioning of the friction trolley is not enough to meet the requirement of precise positioning, so that a device for performing secondary positioning on the lifting appliance, which is simple in structure, convenient to install and convenient to maintain, is needed, and the precise positioning of the lifting appliance is completed.

SUMMERY OF THE UTILITY MODEL

Peripheral for hoist secondary clamp positioner of automobile body includes: the lifting appliance comprises a lifting appliance structure and a secondary positioning structure, wherein the lifting appliance comprises a lifting rod 1, a lifting lug 2 and a lifting appliance positioning frame fixed with the lifting lug, and the secondary positioning structure comprises a positioning support 3, a positioning guide block 4 and a clamping device 5; the lifting lug 2 is fixedly arranged at the lower end part of the suspension rod 1, the positioning bracket 3 comprises a vertical first bracket 31, a vertical second bracket 32, an inclined third bracket 33 and a transverse bracket, the first bracket 31 and the second bracket 32 are vertically arranged, the upper ends of the two brackets are welded and fixed with the two end parts of the end part transverse bracket 34, one or more auxiliary transverse brackets 35 are welded between the first bracket 31 and the second bracket 32, the third bracket 33 is welded and fixed at the middle part of the end part transverse bracket 34, a horizontal auxiliary bracket 36 is arranged between the third bracket 33 and the auxiliary transverse bracket 35, the lower end parts of the first bracket 31 and the second bracket 32 are welded with a first fixed bottom plate 37, the first fixed bottom plate 37 and a second fixed bottom plate 38 are relatively fixed, wherein threaded holes are respectively processed on the surfaces of the first fixed bottom plate 37 and the second fixed bottom plate 38, bolts pass through the threaded holes in the second fixed bottom plate 38 and are fixedly connected with a working table top, a bolt penetrates through a threaded hole of the first fixing bottom plate 37 and abuts against the upper plate surface of the second fixing bottom plate 38 to fix the two fixing bottom plates relatively, a nut on the bolt is screwed on the upper plate surface of the first fixing bottom plate 38, the lower plate surface of the third support 33 is welded with the third fixing bottom plate 39, the third fixing bottom plate 39 is screwed with the fourth fixing bottom plate 310, side groove positioning holes 3101 are machined at four corners of the fourth fixing bottom plate 310, and the fourth fixing bottom plate 310 and the working table top are positioned through the side groove positioning holes 3101; extension arm brackets 311 are horizontally arranged at two ends of the end part transverse bracket 34, a clamping device mounting plate and a connecting plate are fixed at the end parts of the extension arm brackets 311, the clamping device 5 is fixed on the clamping device mounting plate, and the positioning guide block 4 is fixed with the connecting plate; in the secondary positioning state of the lifting appliance, the clamping device 5 clamps the suspension rod 1 to be clamped and positioned in the positioning guide block 4.

In the installation process of the positioning support 3 and the working table, the relative heights between the first fixing bottom plate 37 and the second fixing bottom plate 38 are adjusted through the rotary bolts, the heights of the first support 31 and the second support 32 in the positioning support 3 can be finely adjusted according to the requirement of the working height, then the fixing requirement after the height is finely adjusted is met through the side groove positioning holes 3101 in the fixing bottom plates (the third fixing bottom plate 39 and the fourth fixing bottom plate 310) at the bottom of the third support 33, the stability of the positioning support 3 is ensured in a triangular frame form enclosed by the first support 31, the second support 32 and the third support 33, the structure of the positioning support 3 is simple, and the installation and the positioning are convenient.

Preferably, in the secondary clamping and positioning device for the vehicle body peripheral lifting appliance, a limiting plate 3102 is fixed on the upper plate surface of the fourth fixed bottom plate 310, and the inner side plate surface of the limiting plate 3102 is abutted against four edges of the third fixed bottom plate 39.

The limiting plate 3102 can further prevent the relative movement between the third and fourth fixed bottom plates 39, 310.

Preferably, in the secondary clamping and positioning device for the vehicle body peripheral lifting appliance, the inclined included angle formed by the third support 33 and the plane where the first support 31 and the second support 32 are located is 15-40 degrees. The angle of inclination is too big, and when first support 31, second support 32 fine setting height, third support 33 is difficult to be stable and table surface location installation, and the contained angle of inclination undersize is unfavorable for triangular frame's support stability.

Preferably, the clamping device 5 comprises a clamping cylinder 51 and a clamping arm 52, the clamping arm 52 is fixed at the end of the power output shaft of the clamping cylinder 51, and the cylinder body of the clamping cylinder 51 is fixed with the clamping device mounting plate.

Preferably, the suspender 1 comprises a suspender body 11, the suspender body 11 is of an internal hollow structure, the outer wall of the suspender body 11 is provided with a plurality of threaded holes 111, the suspender body 11 is of a regular N-edge structure, the lifting lug 2 comprises a lifting lug body 21 and a lifting lug mounting plate 22, the inner side of the lifting lug mounting plate 22 is provided with a polygonal clamping groove 221 for positioning the regular polygonal suspender body 11 in a buckling manner, the bolt penetrates through a threaded hole in the surface of the lifting lug body 21, a threaded hole in the surface of the lifting lug mounting plate 22 and a threaded hole in the surface of the suspender body 11 to fix the lifting lug 2 at the end of the suspender 1 in a screwing manner, wherein N is 5, 6, 8 or 10.

The inside face of the lifting lug mounting plate 22 can partially buckle the suspender body 11 in the polygonal clamping groove 221, so as to improve the mounting stability of the lifting lug 2 and the suspender 1, and secondly, the mounting position of the lifting lug 2 can be changed through a plurality of threaded holes 111 on the suspender body 11, so as to change the position of a lifting appliance positioning frame fixed with the lifting lug 2.

Preferably, the secondary clamping and positioning device for the vehicle body peripheral lifting appliance, wherein the clamping arm 52 comprises a clamping arm mounting plate 521 and a clamping head 522, the clamping arm mounting plate 521 is in threaded connection with a power output shaft of the clamping cylinder 51, the clamping head 522 is in threaded connection with the clamping arm mounting plate 521, an inclined plate surface and a flat plate surface are processed on an inner side clamping surface of the clamping head 522, and an included angle between the inclined plate surface and the flat plate surface is the same as that of the regular N-edge-shaped lifting lug body 21. Being convenient for in the centre gripping operation process, the inboard clamping face of chuck 522 can improve the hoist and mount precision on the jib 1 by the hoist and mount equipment hoist and mount with the outside face block of jib 1.

preferably, the positioning guide block 4 is an L-shaped plate, an outer inclined plate surface 41 with the same inclination angle is processed on the inner side surface of the upper portion of the L-shaped plate, and a vertical straight plate surface integrally connected with the outer inclined plate surface 41 is arranged on the lower portion of the L-shaped plate, the lifting appliance positioning frame enters the positioning guide block through the outer inclined plate surface 41 for positioning, and the inclined surface extending outwards from the upper portion facilitates entering of a lifting appliance and positioning in the positioning guide block 41 by using the clamping device 5.

Description of the drawings:

The embodiments are further described with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of a secondary clamping and positioning device for a peripheral hanger of a vehicle body according to the present invention;

FIG. 2 is a view of FIG. 1 from the same angle as A;

FIG. 3 is a view of FIG. 1 at the same angle as B;

FIG. 4 is a view of the structure at a different angle C in FIG. 1 (the structure is rotated by a certain angle for clarity of the structure);

FIG. 5 is a partial structural view at a different angle C in FIG. 1;

The specific structure corresponding to the number is as follows:

The suspension rod 1, the suspension rod body 11, the lifting lug 2, the lifting lug body 21, the lifting lug mounting plate 22, the polygonal clamping groove 221, the positioning bracket 3, the first bracket 31, the second bracket 32, the third bracket 33, the end transverse bracket 34, the auxiliary transverse bracket 35, the horizontal auxiliary bracket 36, the first fixing bottom plate 37, the second fixing bottom plate 38, the third fixing bottom plate 39, the fourth fixing bottom plate 310, the side groove positioning hole 3101, the limiting plate 3102, the extension arm bracket 311, the positioning guide block 4, the outer inclined plate surface 41, the clamping device 5, the clamping cylinder 51, the clamping arm 52, the clamping arm mounting plate 521 and the clamping head 522,

The following detailed description of the invention will be further described in conjunction with the above-identified drawings.

Detailed Description

Specific embodiment example 1:

Peripheral for hoist secondary clamp positioner of automobile body includes: the lifting appliance comprises a lifting appliance structure and a secondary positioning structure, wherein the lifting appliance comprises a lifting rod 1, a lifting lug 2 and a lifting appliance positioning frame fixed with the lifting lug, and the secondary positioning structure comprises a positioning support 3, a positioning guide block 4 and a clamping device 5; the lifting lug 2 is fixedly arranged at the lower end part of the suspension rod 1, the positioning bracket 3 comprises a vertical first bracket 31, a vertical second bracket 32, an inclined third bracket 33 and a transverse bracket, the first bracket 31 and the second bracket 32 are vertically arranged, the upper ends of the two brackets are welded and fixed with the two end parts of the end part transverse bracket 34, one or more auxiliary transverse brackets 35 are welded between the first bracket 31 and the second bracket 32, the third bracket 33 is welded and fixed at the middle part of the end part transverse bracket 34, a horizontal auxiliary bracket 36 is arranged between the third bracket 33 and the auxiliary transverse bracket 35, the lower end parts of the first bracket 31 and the second bracket 32 are welded with a first fixed bottom plate 37, the first fixed bottom plate 37 and a second fixed bottom plate 38 are relatively fixed, wherein threaded holes are respectively processed on the surfaces of the first fixed bottom plate 37 and the second fixed bottom plate 38, bolts pass through the threaded holes in the second fixed bottom plate 38 and are fixedly connected with a working table top, a bolt penetrates through a threaded hole of the first fixing bottom plate 37 and abuts against the upper plate surface of the second fixing bottom plate 38 to fix the two fixing bottom plates relatively, a nut on the bolt is screwed on the upper plate surface of the first fixing bottom plate 38, the lower plate surface of the third support 33 is welded with the third fixing bottom plate 39, the third fixing bottom plate 39 is screwed with the fourth fixing bottom plate 310, side groove positioning holes 3101 are formed in four corners of the fourth fixing bottom plate 310, the fourth fixing bottom plate 310 is positioned with the working table top through the side groove positioning holes 3101, and an inclined included angle formed by the third support 33, the first support 31 and the plane formed by the second support 32 is 18 degrees; extension arm brackets 311 are horizontally arranged at two ends of the end part transverse bracket 34, a clamping device mounting plate and a connecting plate are fixed at the end parts of the extension arm brackets 311, the clamping device 5 is fixed on the clamping device mounting plate, and the positioning guide block 4 is fixed with the connecting plate; in the secondary positioning state of the lifting appliance, the clamping device 5 clamps the suspension rod 1 to be clamped and positioned in the positioning guide block 4.

Wherein, the suspender 1 comprises a suspender body 11, the suspender body 11 is of an internal hollow structure, a plurality of threaded holes are processed on the outer wall of the suspender body 11, the suspender body 11 is of a regular hexagon structure, the lifting lug 2 comprises a lifting lug body 21 and a lifting lug mounting plate 22, a polygonal clamping groove 221 for clamping and positioning part of the regular polygon suspender body 11 is processed on the inner side plate surface of the lifting lug mounting plate 22, the bolt passes through a threaded hole on the plate surface of the lifting lug body 21, a threaded hole on the plate surface of the lifting lug mounting plate 22 and a threaded hole on the plate surface of the suspender body 11 to fix the lifting lug 2 on the end part of the suspender 1 in a screwing way, the clamping arm 52 comprises a clamping arm mounting plate 521 and a clamping head 522, the clamping arm mounting plate 521 is connected with a power output shaft of a clamping cylinder 51 in a screwing way, the clamping head 522, the included angle between the inclined plate surface and the straight plate surface is the same as the included angle of the regular hexagon lifting lug body 21. The inner clamping surface of the clamp 522 can be engaged with the outer plate surface of the suspension rod 1 during the clamping operation.

Furthermore, a limiting plate 3102 is fixed on the upper plate surface of the fourth fixed bottom plate 310, and the inner plate surface of the limiting plate 3102 is abutted against and connected with the four edges of the third fixed bottom plate 39.

Further, the clamping device 5 comprises a clamping cylinder 51 and a clamping arm 52, the clamping arm 52 is fixed at the end of the power output shaft of the clamping cylinder 51, and the cylinder body of the clamping cylinder 51 is fixed with the clamping device mounting plate.

furthermore, the positioning guide block 4 is an L-shaped plate, the inner side surface of the upper part of the L-shaped plate is provided with an outer inclined plate surface 41 with the same inclination angle, and the lower part of the L-shaped plate is a vertical straight plate surface integrally connected with the outer inclined plate surface 41. the lifting appliance positioning frame enters the positioning guide block through the outer inclined plate surface 41 for positioning, and the inclined surface with the upper part expanded outwards is convenient for the lifting appliance to enter and completes positioning in the positioning guide block 41 by using the clamping device 5.

Specific embodiment example 2:

Peripheral for hoist secondary clamp positioner of automobile body includes: the lifting appliance comprises a lifting appliance structure and a secondary positioning structure, wherein the lifting appliance comprises a lifting rod 1, a lifting lug 2 and a lifting appliance positioning frame fixed with the lifting lug, and the secondary positioning structure comprises a positioning support 3, a positioning guide block 4 and a clamping device 5; the lifting lug 2 is fixedly arranged at the lower end part of the suspension rod 1, the positioning bracket 3 comprises a vertical first bracket 31, a vertical second bracket 32, an inclined third bracket 33 and a transverse bracket, the first bracket 31 and the second bracket 32 are vertically arranged, the upper ends of the two brackets are welded and fixed with the two end parts of the end part transverse bracket 34, one or more auxiliary transverse brackets 35 are welded between the first bracket 31 and the second bracket 32, the third bracket 33 is welded and fixed at the middle part of the end part transverse bracket 34, a horizontal auxiliary bracket 36 is arranged between the third bracket 33 and the auxiliary transverse bracket 35, the lower end parts of the first bracket 31 and the second bracket 32 are welded with a first fixed bottom plate 37, the first fixed bottom plate 37 and a second fixed bottom plate 38 are relatively fixed, wherein threaded holes are respectively processed on the surfaces of the first fixed bottom plate 37 and the second fixed bottom plate 38, bolts pass through the threaded holes in the second fixed bottom plate 38 and are fixedly connected with a working table top, a bolt penetrates through a threaded hole of the first fixing bottom plate 37 and abuts against the upper plate surface of the second fixing bottom plate 38 to fix the two fixing bottom plates relatively, a nut on the bolt is screwed on the upper plate surface of the first fixing bottom plate 38, the lower plate surface of the third support 33 is welded with the third fixing bottom plate 39, the third fixing bottom plate 39 is screwed with the fourth fixing bottom plate 310, side groove positioning holes 3101 are formed in four corners of the fourth fixing bottom plate 310, the fourth fixing bottom plate 310 is positioned with the working table top through the side groove positioning holes 3101, and an inclined included angle formed by the third support 33, the first support 31 and the plane formed by the second support 32 is 25 degrees; extension arm brackets 311 are horizontally arranged at two ends of the end part transverse bracket 34, a clamping device mounting plate and a connecting plate are fixed at the end parts of the extension arm brackets 311, the clamping device 5 is fixed on the clamping device mounting plate, and the positioning guide block 4 is fixed with the connecting plate; in the secondary positioning state of the lifting appliance, the clamping device 5 clamps the suspension rod 1 to be clamped and positioned in the positioning guide block 4.

Wherein, the suspender 1 comprises a suspender body 11, the suspender body 11 is of an internal hollow structure, a plurality of threaded holes are processed on the outer wall of the suspender body 11, the suspender body 11 is of a regular octagon structure, the lifting lug 2 comprises a lifting lug body 21 and a lifting lug mounting plate 22, a polygonal clamping groove 221 for clamping and positioning part of the regular polygonal suspender body 11 is processed on the inner side plate surface of the lifting lug mounting plate 22, the bolt passes through a threaded hole on the plate surface of the lifting lug body 21, a threaded hole on the plate surface of the lifting lug mounting plate 22 and a threaded hole on the plate surface of the suspender body 11 to fix the lifting lug 2 on the end part of the suspender 1 in a screwing way, the clamping arm 52 comprises a clamping arm mounting plate 521 and a clamping head 522, the clamping arm mounting plate 521 is connected with a power output shaft of a clamping cylinder 51 in a screwing way, the clamping head, the included angle between the inclined plate surface and the flat plate surface is the same as the included angle of the regular octagonal lifting lug body 21. The inner clamping surface of the clamp 522 can be engaged with the outer plate surface of the suspension rod 1 during the clamping operation.

Detailed description of the preferred embodiment 3

Peripheral for hoist secondary clamp positioner of automobile body includes: the lifting appliance comprises a lifting appliance structure and a secondary positioning structure, wherein the lifting appliance comprises a lifting rod 1, a lifting lug 2 and a lifting appliance positioning frame fixed with the lifting lug, and the secondary positioning structure comprises a positioning support 3, a positioning guide block 4 and a clamping device 5; the lifting lug 2 is fixedly arranged at the lower end part of the suspension rod 1, the positioning bracket 3 comprises a vertical first bracket 31, a vertical second bracket 32, an inclined third bracket 33 and a transverse bracket, the first bracket 31 and the second bracket 32 are vertically arranged, the upper ends of the two brackets are welded and fixed with the two end parts of the end part transverse bracket 34, one or more auxiliary transverse brackets 35 are welded between the first bracket 31 and the second bracket 32, the third bracket 33 is welded and fixed at the middle part of the end part transverse bracket 34, a horizontal auxiliary bracket 36 is arranged between the third bracket 33 and the auxiliary transverse bracket 35, the lower end parts of the first bracket 31 and the second bracket 32 are welded with a first fixed bottom plate 37, the first fixed bottom plate 37 and a second fixed bottom plate 38 are relatively fixed, wherein threaded holes are respectively processed on the surfaces of the first fixed bottom plate 37 and the second fixed bottom plate 38, bolts pass through the threaded holes in the second fixed bottom plate 38 and are fixedly connected with a working table top, a bolt penetrates through a threaded hole of the first fixing bottom plate 37 and abuts against the upper plate surface of the second fixing bottom plate 38 to fix the two fixing bottom plates relatively, a nut on the bolt is screwed on the upper plate surface of the first fixing bottom plate 38, the lower plate surface of the third support 33 is welded with the third fixing bottom plate 39, the third fixing bottom plate 39 is screwed with the fourth fixing bottom plate 310, side groove positioning holes 3101 are formed in four corners of the fourth fixing bottom plate 310, the fourth fixing bottom plate 310 is positioned with the working table top through the side groove positioning holes 3101, and an inclined included angle formed by the third support 33, the first support 31 and the plane formed by the second support 32 is 35 degrees; extension arm brackets 311 are horizontally arranged at two ends of the end part transverse bracket 34, a clamping device mounting plate and a connecting plate are fixed at the end parts of the extension arm brackets 311, the clamping device 5 is fixed on the clamping device mounting plate, and the positioning guide block 4 is fixed with the connecting plate; in the secondary positioning state of the lifting appliance, the clamping device 5 clamps the suspension rod 1 to be clamped and positioned in the positioning guide block 4.

Wherein, the suspender 1 comprises a suspender body 11, the suspender body 11 is of an internal hollow structure, a plurality of threaded holes are processed on the outer wall of the suspender body 11, the suspender body 11 is of a regular decagon structure, the lifting lug 2 comprises a lifting lug body 21 and a lifting lug mounting plate 22, a polygonal clamping groove 221 for clamping and positioning part of the regular polygonal suspender body 11 is processed on the inner side plate surface of the lifting lug mounting plate 22, the bolt passes through a threaded hole on the plate surface of the lifting lug body 21, a threaded hole on the plate surface of the lifting lug mounting plate 22 and a threaded hole on the plate surface of the suspender body 11 to fix the lifting lug 2 on the end part of the suspender 1 in a screwing way, the clamping arm 52 comprises a clamping arm mounting plate 521 and a clamping head 522, the clamping arm mounting plate 521 is connected with a power output shaft of a clamping cylinder 51 in a screwing way, the clamping head 522, the included angle between the inclined plate surface and the straight plate surface is the same as the included angle of the regular decagon lifting lug body 21. The inner clamping surface of the clamp 522 can be engaged with the outer plate surface of the suspension rod 1 during the clamping operation.

According to the secondary clamping and positioning device for the vehicle body peripheral lifting appliance, the lifting rod is fixed in the positioning guide block through the clamping cylinder in the clamping device, secondary positioning operation of the lifting appliance is achieved, positioning accuracy of the lifting appliance is improved, primary positioning of the friction trolley and secondary positioning of the lifting appliance can meet positioning accuracy of getting parts on and off the vehicle body peripheral line and grabbing parts by a robot, automation degree of an automobile production assembly line is greatly improved, and production efficiency is improved; moreover, the secondary clamping and positioning device is simple in structure, convenient to install and easy to realize in overhauling operation.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. Peripheral for hoist secondary clamp positioner of automobile body includes: the lifting appliance comprises a lifting rod, a lifting lug and a lifting appliance positioning frame fixed with the lifting lug, and the secondary positioning structure comprises a positioning support, a positioning guide block and a clamping device; the lug fixed mounting is at the lower tip of jib, its characterized in that: the positioning support comprises a vertical first support, a vertical second support, an inclined third support and a transverse support, the first support and the second support are vertically arranged, the upper ends of the two supports are welded and fixed with the two end parts of the end part transverse support, one or more auxiliary transverse supports are welded between the first support and the second support, the third support is welded and fixed in the middle of the end part transverse support, a horizontal auxiliary support is arranged between the third support and the auxiliary transverse support, a first fixing bottom plate is welded at the lower end parts of the first support and the second support, the first fixing bottom plate and the second fixing bottom plate are relatively fixed, threaded holes are formed in the plate surfaces of the first fixing bottom plate and the second fixing bottom plate, bolts penetrate through threaded holes in the second fixing bottom plate and are fixedly connected with the working table top, the bolts penetrate through threaded holes of the first fixing bottom plate and abut against the upper plate surface of the second fixing bottom plate to relatively fix the two fixing bottom plates, the screw cap on the bolt is screwed on the upper plate surface of the first fixing bottom plate, the lower plate surface of the third support is welded with the third fixing bottom plate, the third fixing bottom plate is screwed with the fourth fixing bottom plate, side groove positioning holes are processed at four corners of the fourth fixing bottom plate, and the fourth fixing bottom plate and the working table surface are positioned through the side groove positioning holes; the two ends of the end part transverse support are horizontally provided with extension arm supports, the end part of each extension arm support is fixedly provided with a clamping device mounting plate and a connecting plate, the clamping device is fixedly arranged on the clamping device mounting plate, and the positioning guide block is fixedly arranged on the connecting plate; and in the secondary positioning state of the lifting appliance, the clamping device clamps the lifting rod to enable the lifting rod to be clamped and positioned in the positioning guide block.

2. The secondary clamping and positioning device for the vehicle body peripheral lifting appliance according to claim 1, characterized in that: and a limiting plate is fixed on the upper plate surface of the fourth fixed bottom plate, and the inner side plate surface of the limiting plate is butted and connected with four edges of the third fixed bottom plate.

3. The secondary clamping and positioning device for the vehicle body peripheral lifting appliance according to claim 1, characterized in that: the inclined included angle formed by the third support and the plane where the first support and the second support are located is 15-40 degrees.

4. The secondary clamping and positioning device for the vehicle body peripheral lifting appliance according to claim 1, characterized in that: the clamping device comprises a clamping cylinder and a clamping arm, the clamping arm is fixed at the end part of a power output shaft of the clamping cylinder, and a cylinder body of the clamping cylinder is fixed with the clamping device mounting plate.

5. The secondary clamping and positioning device for the vehicle body peripheral lifting appliance according to claim 1, characterized in that: the jib includes the jib body, it has a plurality of screw holes to process on the outer wall of jib body and jib body for inside hollow structure, the jib body is regular N limit shape structure, and the lug includes lug body, lug mounting panel, the inboard face processing of lug mounting panel has the polygon draw-in groove with regular polygon jib body part buckle location, the bolt passes the screw hole of lug body face, the screw hole of lug mounting panel face, the screw hole of jib body face with the lug spiral shell solid at the tip of jib, wherein N is 5, 6, 8 or 10.

6. The secondary clamping and positioning device for the vehicle body peripheral lifting appliance according to claim 4, wherein: the arm lock includes arm lock mounting panel, chuck, the arm lock mounting panel is connected with die clamping cylinder's power take off axle spiro union, the chuck is connected with the arm lock mounting panel spiro union admittedly, the inboard clamping face processing of chuck has slope face and straight face, and the contained angle between slope face and the straight face is the same with the contained angle of positive N limit shape lug body, is convenient for in centre gripping operation process, and the inboard clamping face of chuck can with the outside face block of jib.

7. the secondary clamping and positioning device for the peripheral lifting appliance of the vehicle body as claimed in claim 1, wherein the positioning guide block is an L-shaped plate, the inner side surface of the upper part of the L-shaped plate is provided with an outer inclined plate surface with the same inclination angle, and the lower part of the L-shaped plate is a vertical straight plate surface integrally connected with the outer inclined plate surface.