CN104743477B - A kind of scissor type elevating structure - Google Patents

Abstract

The invention discloses a scissor-type lifting structure, which is characterized in that it comprises an upper scissor unit, a lower scissor unit and a lifting oil cylinder, a plurality of upper scissor units are hinged sequentially from bottom to top, and a plurality of lower scissor units automatically It is hinged sequentially from bottom to top, wherein the lower scissor unit includes two first outer scissor tubes, two first inner scissor tubes arranged between the two first outer scissor tubes, and a For the lower scissor shaft of the fork tube and the first inner scissor tube, the present invention not only ensures the lifting height, but also lowers the lifting hydraulic cylinder by reducing the thickness of the upper scissor unit through the upper scissor unit with a narrower width. The weight to be carried improves the efficiency and safety of the equipment, and the stability of the support is ensured by the lower scissor unit with a wider width.

Description

A scissor lift structure

technical field

The invention relates to a scissor lift structure.

Background technique

Aerial work platform is a product that serves mobile high-altitude operations such as aerial work, equipment installation, and maintenance in various industries. The related products of aerial work platforms mainly include: scissor-type aerial work platforms, vehicle-mounted aerial work platforms, articulating-arm aerial work platforms, self-propelled aerial work platforms, aluminum alloy aerial work platforms, and cylinder-type aerial work platforms. The existing scissor-type aerial work platforms have the following problems: the scissor lifting device is assembled by stacking the scissor tubes intersecting and hinged one by one, and the scissor tubes on the bottom layer are hinged on the track wheels. On the upper, the track wheels can slide back and forth on the chassis along the track to match the up and down lift of the scissor tube. Due to the increasing working height of the existing aerial work platforms, the weight of the lifting device is also increasing, resulting in the lifting cylinder needing to withstand greater working pressure. In order to ensure the stability of the work, it is necessary to set up an auxiliary lifting cylinder. Auxiliary support leads to higher equipment costs.

Contents of the invention

The object of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a scissor-type lifting structure with reasonable structural design, low weight of the lifting device, and low working pressure on the lifting cylinder.

The technical solution adopted by the present invention to solve the above problems is:

A scissor lift structure, characterized in that it includes an upper scissor unit, a lower scissor unit and a lifting oil cylinder, a plurality of upper scissor units are hinged sequentially from bottom to top, and a plurality of lower scissor units are sequentially hinged from bottom to top hinged, wherein the lower scissor unit includes two first outer scissor tubes, two first inner scissor tubes arranged between the two first outer scissor tubes, and is used to connect the first outer scissor tube and the second The lower scissor shaft of the first inner scissor tube, the lower end, middle part and upper end of the first outer scissor tube are provided with lower scissor shaft fixing holes for the lower scissor shaft to be inserted into, and the upper end, middle part of the first inner scissor tube The first bearing installation hole is provided at the lower end of the lower scissors, and the first bearing is installed in the first bearing installation hole. In the same lower scissors unit, the shaft hinge of the lower scissors located in the middle of the lifting device passes through one of the first outer scissors in turn. The lower scissor shaft fixing hole in the middle of the fork tube, the inner hole of the first bearing in the middle of one of the first inner scissor tubes, the inner hole of the first bearing in the middle of the other first inner scissor tube, and the other The lower scissor shaft fixing hole in the middle of the first outer scissor tube, among the two lower scissor units adjacent up and down, the lower scissor shaft located in front of the lifting device passes through one of the upper lower scissor units in turn The lower scissor shaft fixing hole at the lower end of the first outer scissor tube, the inner hole of the first bearing at the upper end of one of the first inner scissor tubes of the lower scissor unit located below, the lower scissor unit located below The inner hole of the first bearing at the upper end of the other first inner scissor tube and the lower scissor shaft fixing hole at the lower end of the other first outer scissor tube of the upper lower scissor unit are located at the rear of the lifting device. The lower scissor shaft passes through the lower scissor shaft fixing hole at the lower end of one of the first outer scissor tubes of the lower lower scissor unit and one of the first inner scissor tubes of the upper lower scissor unit The inner hole of the first bearing at the upper end, the inner hole of the first bearing at the upper end of the upper lower scissors unit of the other first inner scissors tube, and the other first outer scissors of the upper lower scissors unit The lower scissors shaft fixing hole at the lower end of the fork tube, the lower scissors shaft is fixed with the first bearing, the lower scissors shaft is pierced with a first screw, the two ends of the first screw are provided with a first locking plate, and the first locking plate passes through The first nut installed on the first screw rod is compressed and fixed on the outer wall of the first outer scissor tube, and the first inner scissor tube of the lower scissor unit located at the bottom is hinged on the chassis, and the chassis is provided with two Tracks, the two first outer scissor tubes of the lower scissor unit at the bottom are all rotatably mounted with track wheels, and the track wheels are arranged on the two tracks, and the two first outer scissor tubes of the lower scissor unit at the top An oil cylinder mount is fixed on the inner scissor tube, and the cylinder body of the lifting cylinder is hinged on the oil cylinder mount. The upper scissor unit includes two second outer scissor tubes, and one is arranged between the two second outer scissor tubes. The second inner scissor pipe between them and the upper scissor shaft used to connect the second outer scissor pipe and the second inner scissor pipe. On the scissor tube, the lower, middle and upper ends of the second outer scissor tube are provided with upper scissor shaft fixing holes for the insertion of the upper scissor shaft, and the upper, middle and lower ends of the second inner scissor tube are provided with the first The second bearing mounting hole, the second bearing mounting hole is equipped with the second bearing , in the same upper scissor unit, the upper scissor shaft hinge located in the middle of the lifting device passes through the upper scissor shaft fixing hole in the middle of one of the second outer scissor tubes, the second inner scissor tube in the middle of the second inner scissor tube. The inner hole of the second bearing and the upper scissor shaft fixing hole in the middle of another second outer scissor tube, among the two upper scissor units adjacent up and down, the upper scissor shaft located in front of the lifting device passes through the The upper scissor shaft fixing hole at the lower end of one of the second outer scissor tubes of the upper upper scissor unit, the inner hole of the second bearing at the upper end of the second inner scissor tube of the lower upper scissor unit, and the upper The upper scissor shaft fixing hole at the lower end of the other second outer scissor tube of the upper scissor unit of the upper scissor unit, the upper scissor shaft at the rear of the lifting device passes through one of the second outer scissor tubes of the lower upper scissor unit in sequence The fixing hole of the upper scissor shaft at the lower end of the outer scissor tube, the inner hole of the second bearing at the upper end of the second inner scissor tube of the upper upper scissor unit located above, and the other second outer root of the upper upper scissor unit located above The upper scissor shaft fixing hole at the lower end of the scissor tube, the upper scissor shaft is fixed with the second bearing, the upper scissor shaft is pierced with a second screw rod, the two ends of the second screw rod are sleeved with a second locking plate, and the second locking plate The second nut installed on the second screw rod is pressed and fixed on the outer wall of the second outer scissors tube, and the second inner scissors tube of the upper scissors unit located at the top is hinged on the bottom of the working platform, and the bottom of the working platform There are two track grooves on the top, and the second outer scissor tube of the upper scissor unit at the top is rotatably equipped with track groove rollers. The track groove rollers are set in the two track grooves, and the upper scissors at the bottom The lower ends of the two second outer scissor tubes of the fork unit are arranged between the upper ends of the two first outer scissor tubes of the uppermost lower scissor unit, and the two second outer scissor tubes of the lowermost upper scissor unit. The lower end of the outer scissor tube and the upper ends of the two first outer scissor tubes of the uppermost lower scissor unit are coaxially hinged through the middle scissor shaft at the front position of the lifting device, and the upper end of the lowermost upper scissor unit The lower end of the second inner scissor tube is arranged at the upper end between the two first inner scissor tubes of the uppermost lower scissor unit, and the lower end of the second inner scissor tube of the lowermost upper scissor unit and The upper end between the two first inner scissor tubes of the uppermost lower scissor unit is hinged linearly and coaxially through the middle scissor shaft located at the rear of the lifting device. With this structure, the upper scissor unit with a narrower width not only ensures the lifting height, but also reduces the weight to be carried by the lifting hydraulic cylinder by reducing the thickness of the upper scissor unit, improving equipment efficiency and safety , and the stability of the support is ensured by the wide lower scissors unit.

As a preference, in a pair of upper and lower upper scissor units adjacent to each other, an inspection strut is installed on the second outer scissor tube of the upper upper scissor unit, and one end of the inspection strut is hinged on the second outer scissors. On the tube, the other end of the inspection pole is fixed with a fixed bayonet, and the second outer scissors tube of the upper scissor unit above is fixed with a fixed bayonet for snapping into the fixed bayonet. The second outer scissors tube and the A pin hole for inserting a fixing pin is provided on the maintenance support rod. With this structure, when maintenance is required, pull out the fixing pin, turn the maintenance pole, align the fixed bayonet with the fixed deck, and operate the lifting device to lower the maintenance pole against the fixed deck, thereby preventing the During the maintenance process, the lifting hydraulic cylinder suddenly loses oil pressure and the lifting device continues to descend, which reduces the safety risk.

Compared with the prior art, the present invention has the following advantages and effects: the upper scissors unit with a narrower width not only ensures the lifting height, but also reduces the load capacity of the lifting hydraulic cylinder by reducing the thickness of the upper scissors unit. The weight of the equipment improves the efficiency and safety of the equipment, and the stability of the support is ensured by the wide lower scissors unit.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of a scissor-type aerial work platform according to an embodiment of the present invention.

Fig. 2 is a schematic view of the front structure of the scissor type aerial work platform according to the embodiment of the present invention.

Fig. 3 is a schematic view of the side structure of the scissor-type aerial work platform according to the embodiment of the present invention.

Fig. 4 is a schematic diagram of the installation structure of the upper scissors unit according to the embodiment of the present invention.

Fig. 5 is a schematic diagram of the installation structure of the lower scissors unit according to the embodiment of the present invention.

Fig. 6 is a schematic cross-sectional structure diagram of the lower scissors unit according to the embodiment of the present invention.

Fig. 7 is a schematic view of the front structure of the traveling device according to the embodiment of the present invention in the state of going straight.

Fig. 8 is a three-dimensional structural schematic view of the traveling device of the embodiment of the present invention in a straight-ahead state.

Fig. 9 is a schematic top view of the traveling device of the embodiment of the present invention in a straight-ahead state.

Fig. 10 is a schematic top view of the traveling device in the steering state according to the embodiment of the present invention.

Fig. 11 is a schematic diagram of the installation structure of the maintenance support rod according to the embodiment of the present invention.

Fig. 12 is a structural schematic diagram of a wiring pipeline structure according to an embodiment of the present invention.

Fig. 13 is a schematic diagram of the installation structure of the wiring hose according to the embodiment of the present invention.

Fig. 14 is a schematic structural view of a hard tube fixing frame according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

Referring to Fig. 1-Fig. 14, the scissor-type aerial work platform in this embodiment includes a traveling chassis 1 and a lifting device 2, the traveling chassis 1 includes a chassis 11, a traveling device 12 and a leg structure 14, and the lifting device 2 includes Scissor lift structure 21 and working platform 22.

Described traveling device 12 comprises left steering wheel 121, right steering wheel 122, left wheel frame 123, right wheel frame 124, linkage frame 125, steering oil cylinder 126 and steering bending plate 127, and described left steering wheel 121, right steering wheel 122 respectively Rotation is installed on the left wheel frame 123, the right wheel frame 124, and the left steering wheel 121, the right steering wheel 122 are realized driving by the left drive motor that is fixed on the left wheel frame 123, the right drive motor that is fixed on the right wheel frame 124 respectively, and the left wheel Frame 123 and right wheel frame 124 are installed on the chassis 11 through wheel frame shaft 128 rotation, and the axis of wheel frame shaft 128 is vertically arranged, and linkage frame 125 is respectively fixed on the two linkages of linkage frame main body 1251 two ends by linkage frame main body 1251. The steering cylinder 126 is located between the two linkage frame connecting sections 1252. The steering cylinder 126 adopts a double-rod hydraulic cylinder. The two movable rods of the steering cylinder 126 are respectively connected to the two linkage frame connecting sections 1252. One end of each steering bend 127 is respectively hinged on the left wheel frame 123 and the right wheel frame 124, and the other ends of the two steering bends 127 are respectively hinged on the two ends of the linkage frame main body 1251, and the steering oil cylinder 126 is fixed on the chassis 11. A recess 1271 is provided on the side of the bent plate 127 facing the wheel frame shaft 128 . With this structure, the steering cylinder 126 drives the linkage frame 125 to move linearly, thereby driving the steering bend 127, so that the steering bend 127 pulls the left wheel frame 123 and the right wheel frame 124 to rotate to realize steering. In this structure, the steering oil cylinder 126 uses a double-rod hydraulic cylinder not only to simplify the linkage structure, but also to improve the stability and synchronization of the steering process; by setting the recess 1271 on the steering bend 127, the steering bend 127 can be closer to the wheel frame shaft 128, thereby The angle limit of the steering can be increased, and the use performance is enhanced. The main body 1251 of the linkage frame and the two connecting sections 1252 of the linkage frame form an integral structure.

The scissor lift structure 21 includes an upper scissor unit 211, a lower scissor unit 212, and a lifting cylinder 213. A plurality of upper scissor units 211 are hinged sequentially from bottom to top, and a plurality of lower scissor units 212 are connected from bottom to top. The lower scissors unit 212 includes two first outer scissor tubes 2121, two first inner scissor tubes 2122 arranged between the two first outer scissor tubes 2121, and the first outer scissor tube 2122 for connecting the first outer scissor tubes. The lower scissor shaft 2123 of the scissor tube 2121 and the first inner scissor tube 2122, the lower end, the middle part and the upper end of the first outer scissor tube 2121 are provided with a lower scissor shaft fixing hole 2124 for inserting the lower scissor shaft 2123 , the upper end, the middle part and the lower end of the first inner scissor tube 2122 are provided with a first bearing installation hole 2125, and the first bearing installation hole 2125 is equipped with a first bearing 2126, which is located in the middle of the lifting device 2 in the same lower scissor unit 212 The lower scissor shaft 2123 of the position passes through the lower scissor shaft fixing hole 2124 in the middle part of one of the first outer scissor tubes 2121 and the inner part of the first bearing 2126 in the middle part of one of the first inner scissor tubes 2122. hole, the inner hole of the first bearing 2126 in the middle part of the other first inner scissor tube 2122 and the lower scissor shaft fixing hole 2124 in the middle part of the other first outer scissor tube 2121, the two lower scissors adjacent up and down In the unit 212, the lower scissor shaft 2123 located in front of the lifting device 2 sequentially passes through the lower scissor shaft fixing hole 2124 at the lower end of one of the first outer scissor tubes 2121 of the upper lower scissor unit 212, and is located below The inner hole of the first bearing 2126 at the upper end of one of the first inner scissor tubes 2122 of the lower scissor unit 212, the first inner hole at the upper end of the other first inner scissor tube 2122 of the lower scissor unit 212 below. The inner hole of the bearing 2126 and the lower scissor shaft fixing hole 2124 at the lower end of the other first outer scissor tube 2121 of the upper lower scissor unit 212 pass through the lower scissor shaft 2123 located at the rear of the lifting device 2 in sequence The lower scissor shaft fixing hole 2124 at the lower end of one of the first outer scissor tubes 2121 of the lower scissor unit 212 located below, the upper end of one of the first inner scissor tubes 2122 of the upper lower scissor unit 212 The inner hole of the first bearing 2126, the inner hole of the first bearing 2126 at the upper end of the other first inner scissor tube 2122 of the upper lower scissor unit 212 and the other first inner hole of the upper lower scissor unit 212 of the upper scissor unit 212 The lower scissor shaft fixing hole 2124 at the lower end of an outer scissor tube 2121, the lower scissor shaft 2123 is fixed to the first bearing 2126, the lower scissor shaft 2123 is pierced with a first screw 2128, and the two ends of the first screw 2128 are sleeved with The first locking plate 2127, the first locking plate 2127 is compressed and fixed on the outer wall of the first outer scissor tube 2121 through the first nut 2129 installed on the first screw rod 2128, and the first locking plate 2127 is located at the bottom of the lower scissor unit 212. An inner scissor pipe 2122 is hinged on the chassis 11, and the chassis 11 is provided with two rails 214, the position The two first outer scissor tubes 2121 of the lower scissor unit 212 at the bottom are all rotatably equipped with track wheels 215, and the track wheels 215 are arranged on two tracks 214, and the lower scissor unit 212 at the top The two first inner scissor tubes 2122 are fixed with oil cylinder mounting bases 216, the cylinder body of the lifting cylinder 213 is hinged on the oil cylinder mounting bases 216, and the upper scissor unit 211 includes two second outer scissor tubes 2111, one set The first inner scissor tube 2122 between the two second outer scissor tubes 2111 and the upper scissor shaft for connecting the second outer scissor tube 2111 and the second inner scissor tube, and the telescopic rod of the lifting cylinder 213 Hinged on the first inner scissor tube 2122 of the lowermost upper scissor unit 211, the lower, middle and upper ends of the second outer scissor tube 2111 are provided with upper scissor shaft fixing holes for insertion of the upper scissor shaft , the upper end, the middle part and the lower end of the second inner scissor pipe are provided with a second bearing installation hole, the second bearing installation hole is equipped with a second bearing, and the upper scissor located in the middle position of the lifting device 2 in the same upper scissor unit 211 The fork shaft hinge passes through the upper scissor shaft fixing hole in the middle part of one of the second outer scissor tubes 2111, the inner hole of the second bearing on the middle part of the second inner scissor tube and the other second outer scissor tube The upper scissor shaft fixing hole in the middle of 2111, among the two upper scissor units 211 adjacent up and down, the upper scissor shaft located in front of the lifting device 2 passes through one of the upper scissor units 211 located above in turn. The upper scissor shaft fixing hole at the lower end of the two outer scissor tubes 2111, the inner hole of the second bearing at the upper end of the second inner scissor tube of the upper scissor unit 211 located below, and the other end of the upper scissor unit 211 located above. The upper scissor shaft fixing hole at the lower end of the second outer scissor tube 2111, the upper scissor shaft located at the rear of the lifting device 2 sequentially passes through one of the second outer scissor tubes 2111 of the lower upper scissor unit 211 The fixing hole of the upper scissor shaft at the lower end, the inner hole of the second bearing at the upper end of the second inner scissor tube of the upper upper scissor unit 211 and the other second outer scissor of the upper upper scissor unit 211 The upper scissor shaft fixing hole at the lower end of the tube 2111, the upper scissor shaft is fixed with the second bearing, the upper scissor shaft is pierced with a second screw 2114, and the two ends of the second screw 2114 are sleeved with a second locking plate 2116, the second The locking plate 2116 is compressed and fixed on the outer wall of the second outer scissor tube 2111 by the second nut 2115 installed on the second screw rod 2114, and the second inner scissor tube of the upper scissor unit 211 located at the top is hinged in the working On the bottom of the platform 22, two track grooves are arranged on the bottom of the working platform 22, and the second outer scissor tube 2111 of the upper scissor unit 211 positioned at the top is all rotatably equipped with track groove rollers, and the track groove rollers are arranged on both sides. in the track groove. The lower ends of the two second outer scissor tubes 2111 of the lowermost upper scissor unit 211 are arranged between the upper ends of the two first outer scissor tubes 2121 of the uppermost lower scissor unit 212, at the bottom The lower ends of the two second outer scissor tubes 2111 of the upper scissor unit 211 and the upper ends of the two first outer scissor tubes 2121 of the uppermost lower scissor unit 212 pass through the middle scissor at the front position of the lifting device 2 The shaft 2117 realizes the coaxial hinge, and the lower end of the second inner scissor tube of the lowermost upper scissor unit 211 is arranged at the upper end between the two first inner scissor tubes 2122 of the uppermost lower scissor unit 212 , the lower end of the second inner scissor tube of the lowermost upper scissor unit 211 and the upper end between the two first inner scissor tubes 2122 of the uppermost lower scissor unit 212 pass through the position behind the lifting device 2 The intermediate scissors shaft 2117 is hinged on a straight line and coaxially. With this structure, the upper scissor unit 211 with a narrower width not only ensures the lifting height, but also reduces the weight to be carried by the lifting hydraulic cylinder by reducing the thickness of the upper scissor unit 211, thereby improving equipment efficiency and Safety, and the stability of the support is guaranteed by the lower scissor unit 212 with a wider width.

In a pair of two upper scissor units 211 that are adjacent up and down, the second outer scissor tube 2111 of the upper upper scissor unit 211 is equipped with an inspection support rod 2118, and one end of the inspection support rod 2118 is hinged on the second outer scissor tube. On the scissor tube 2111, the other end of the maintenance pole 2118 is fixed with a fixed bayonet 21181, and the second outer scissor tube 2111 of the upper scissor unit 211 above is fixed with a fixed bayonet for clamping the fixed bayonet 21181 2119, the second outer scissor tube 2111 and the inspection support rod 2118 are provided with a pin hole 21110 for inserting a fixing pin. With this structure, when maintenance is required, the fixing pin is pulled out, the maintenance pole 2118 is turned, the fixed bayonet 21181 is aligned with the fixed bay 2119, and the lifting device 2 is operated to descend, and the maintenance pole 2118 is placed on the fixed bay 2119, thereby preventing the situation that the lifting device 2 continues to descend due to the sudden loss of oil pressure of the lifting hydraulic cylinder during the maintenance process, reducing safety risks.

The scissor lift structure 21 is provided with a wiring pipeline structure, and the wiring pipeline structure includes a wiring hard pipe 2171, a wiring hose 2172 and a control line for controlling the work of the working platform 22. The wiring hard pipe 2171 is fixed on On the scissor lift structure 21, the adjacent wiring hard tubes 2171 are connected by the wiring hard tubes 2171, the wiring pipeline formed by the wiring hard tubes 2171 and the wiring hoses 2172 is set from the chassis 11 to the working platform 22, and the control line is set In the wiring pipeline composed of the wiring hard tube 2171 and the wiring hose 2172, the wiring hard tube 2171 is fixed on the scissor lift structure 21 through the hard tube fixing frame 2173, wherein the hard tube fixing frame 2173 includes an Ω-shaped fixing piece 2174 and the mounting piece 2175, the wiring hard tube 2171 passes through the Ω-shaped fixing piece 2174, and the two ends of the Ω-shaped fixing piece 2174 are fixed on the mounting piece 2175 by screws, so that the wiring hard tube 2171 is fixed on the hard tube On the fixing frame 2173 , the mounting piece 2175 is fixed on the scissor lift structure 21 . With this structure, the wiring pipeline formed by the wiring hard tube 2171 and the wiring hose 2172 not only enables the control line to be better protected in the wiring hard tube 2171, but also passes the wiring hard tube between adjacent wiring hard tubes 2171. The connection of 2171 makes it possible for the adjacent wiring hard tubes 2171 to rotate in accordance with the movement of the scissor lift structure 21 during the up and down process of the scissor lift structure 21 .

The end of the hard wiring pipe 2171 is provided with an external thread, and the end of the wiring hose 2172 is fixed with a chuck 2176. The chuck 2176 is fixed on the installation pipe, and the installation pipe is provided with an internal thread, so that the installation pipe is tightened and fixed on the wiring. The end of the hard tube 2171. With this structure, the wiring hard tube 2171 and the wiring hose 2172 can be easily disengaged, thereby facilitating the installation and maintenance of the control line.

The above content described in this specification is only an illustration of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, as long as they do not deviate from the content of the description of the present invention or exceed the scope defined in the claims , should belong to the protection scope of the present invention.

Claims (2)

1. A scissor lift structure, characterized in that it includes an upper scissor unit, a lower scissor unit and a lift cylinder, a plurality of upper scissor units are hinged from bottom to top, and a plurality of lower scissor units are from bottom to top The upper part is hinged sequentially, wherein the lower scissor unit includes two first outer scissor tubes, two first inner scissor tubes arranged between the two first outer scissor tubes, and a and the lower scissor shaft of the first inner scissor tube, the lower, middle and upper ends of the first outer scissor tube are provided with lower scissor shaft fixing holes for the insertion of the lower scissor shaft, and the upper end of the first inner scissor tube , the middle part and the lower end are provided with the first bearing mounting hole, the first bearing mounting hole is equipped with the first bearing, and in the same lower scissors unit, the lower scissors shaft hinge located in the middle of the lifting device passes through one of the first The lower scissor shaft fixing hole in the middle of the outer scissor tube, the inner hole of the first bearing in the middle of one of the first inner scissor tubes, the inner hole of the first bearing in the middle of the other first inner scissor tube, and the other The lower scissor shaft fixing hole in the middle of a first outer scissor tube, among the two lower scissor units adjacent up and down, the lower scissor shaft located in front of the lifting device passes through the lower scissor unit located above in turn The lower scissor shaft fixing hole at the lower end of one of the first outer scissor tubes, the inner hole of the first bearing at the upper end of one of the first inner scissor tubes of the lower scissor unit located below, and the lower scissors located below The inner hole of the first bearing at the upper end of the other first inner scissor tube of the unit and the lower scissor shaft fixing hole at the lower end of the other first outer scissor tube of the upper lower scissor unit are located behind the lifting device The lower scissor shaft at the lower position passes through the lower scissor shaft fixing hole at the lower end of one of the first outer scissor tubes of the lower lower scissor unit, and one of the first inner scissors of the upper lower scissor unit. The inner hole of the first bearing at the upper end of the fork tube, the inner hole of the first bearing at the upper end of the upper lower scissors unit of the upper lower scissors unit, and the other first inner hole of the upper lower scissors unit. The lower scissor shaft fixing hole at the lower end of the outer scissor tube, the lower scissor shaft is fixed to the first bearing, the lower scissor shaft is pierced with a first screw, the two ends of the first screw are sleeved with a first locking plate, and the first locking The plate is compressed and fixed on the outer wall of the first outer scissor tube by the first nut installed on the first screw rod, and the first inner scissor tube of the lower scissor unit located at the bottom is hinged on the chassis, and the chassis is provided with Two tracks, the two first outer scissor tubes of the lower scissor unit at the bottom are all rotatably equipped with track wheels, and the track wheels are arranged on the two tracks, and the two outer scissor tubes of the lower scissor unit at the top An oil cylinder mount is fixed on the first inner scissor tube, and the cylinder body of the lifting cylinder is hinged on the oil cylinder mount. The upper scissor unit includes two second outer scissor tubes, one set on the two second outer scissor The second inner scissor pipe between the pipes and the upper scissor shaft used to connect the second outer scissor pipe and the second inner scissor pipe. The telescopic rod of the lifting cylinder is hinged on the first On the first inner scissor tube, the lower end, middle part and upper end of the second outer scissor tube are provided with upper scissor shaft fixing holes for the upper scissor shaft to be inserted into, and the upper end, middle part and lower end of the second inner scissor tube are provided with There is a second bearing mounting hole, the second bearing mounting hole is equipped with a second Bearings, in the same upper scissor unit, the upper scissor shaft hinge located in the middle of the lifting device passes through the upper scissor shaft fixing hole in the middle of one of the second outer scissor tubes, and the upper scissor shaft hinge in the middle of the second inner scissor tube The inner hole of the second bearing and the fixing hole of the upper scissor shaft in the middle of another second outer scissor tube, among the two upper scissor units adjacent up and down, the upper scissor shaft located in front of the lifting device passes through in sequence The upper scissor shaft fixing hole at the lower end of one of the second outer scissor tubes of the upper upper scissor unit, the inner hole of the second bearing at the upper end of the second inner scissor tube of the lower upper scissor unit, and the The upper scissor shaft fixing hole at the lower end of the other second outer scissor tube of the upper upper scissor unit, the upper scissor shaft at the rear of the lifting device passes through one of the first outer scissor tubes of the lower upper scissor unit in turn. The fixing hole of the upper scissor shaft at the lower end of the two outer scissor tubes, the inner hole of the second bearing at the upper end of the second inner scissor tube of the upper upper scissor unit and the other second shaft of the upper upper scissor unit The upper scissor shaft fixing hole at the lower end of the outer scissor tube, the upper scissor shaft is fixed with the second bearing, the upper scissor shaft is pierced with a second screw, the two ends of the second screw are sleeved with a second locking plate, and the second locking The plate is compressed and fixed on the outer wall of the second outer scissor tube through the second nut installed on the second screw rod, and the second inner scissor tube of the upper scissor unit located at the top is hinged on the bottom of the working platform, and the working platform There are two track grooves on the bottom, and the second outer scissor tube of the upper scissor unit located at the top is rotatably equipped with track groove rollers, and the track groove rollers are arranged in the two track grooves, The lower ends of the two second outer scissor tubes of the scissor unit are arranged between the upper ends of the two first outer scissor tubes of the uppermost lower scissor unit, and the two second outer scissor tubes of the lowermost upper scissor unit The lower ends of the second outer scissor tubes and the upper ends of the two first outer scissor tubes of the uppermost lower scissor unit are coaxially hinged through the middle scissor shaft in front of the lifting device, and the lowermost upper scissor unit The lower end of the second inner scissor tube is set at the upper end between the two first inner scissor tubes of the uppermost lower scissor unit, and the lower end of the second inner scissor tube of the lowermost upper scissor unit The upper end between the two first inner scissor tubes of the uppermost lower scissor unit is hinged linearly and coaxially through the middle scissor shaft located at the rear of the lifting device. 2. The scissor lift structure according to claim 1, characterized in that: in a pair of two upper scissor units adjacent up and down, the second outer scissor tube of the upper upper scissor unit is installed with Inspection support rod, one end of the inspection support rod is hinged on the second outer scissor tube, the other end of the inspection support rod is fixed with a fixed bayonet, and the second outer scissor tube of the upper upper scissor unit is fixed with a The fixed bayonet that is connected to the fixed bayonet, the second outer scissors tube and the inspection pole are provided with pin holes for inserting the fixed pin.