CN217895082U - Lifting arm assembly and straight arm type aerial work platform convenient to transport - Google Patents

Abstract

The utility model relates to the field of arm-type aerial work platform trucks, in particular to a lifting arm assembly and a straight arm-type aerial work platform, wherein the lifting arm assembly comprises a big arm body, a small arm body and a variable amplitude connecting device, and the lifting end of the big arm body is rotationally connected with the fulcrum end of the small arm body; the amplitude-variable connecting device comprises a first telescopic push rod and a first transmission rod, the rear end of the first telescopic push rod is rotatably connected to the large arm body, the front end of the first telescopic push rod is rotatably connected to the rear end of the first transmission rod, the first transmission rod is located between the large arm body and the small arm body, the front end of the first transmission rod is rotatably connected to the pivot end of the small arm body, and telescopic motion of the first telescopic push rod can push the small arm body to swing relative to the large arm body by driving the whole direction change and displacement of the first transmission rod. The whole diversion of first transfer lever and the range and the scope of displacement are very big for the range that first transfer lever and forearm body rotate the rear end of being connected and can displace is very big, and then makes the enough wobbling angle range of forearm body great, realizes the wide range of the forearm body and becomes width, reduces the work blind area.

Description

Lifting arm assembly and straight arm type aerial work platform convenient to transport

Technical Field

The utility model relates to an arm-type aerial working platform truck field, concretely relates to lifting arm assembly and straight arm-type aerial working platform of being convenient for transportation.

Background

The aerial work platform is an advanced aerial work machine, can greatly improve the working efficiency, safety and comfort of aerial constructors, reduces the labor intensity, and is widely applied in developed countries. The use of the aerial work platform in China is more and more extensive, such as the initial general municipal street lamp maintenance, garden tree pruning and the like, and along with the rapid development of economy in China, the demand of engineering construction, industrial installation, equipment maintenance, factory building maintenance, shipbuilding, electric power, municipal administration, airports, communication, gardens, traffic and the like on the aerial work platform is continuously increased.

At present, a straight arm type aerial work platform generally comprises a large arm, a small arm and a work platform, wherein amplitude variation is realized through rotation of the small arm relative to the large arm, and leveling is realized through rotation of the work platform relative to the small arm. The crank arm lifting structure of the crank arm type aerial work platform truck disclosed in the patent with the application number of CN202010061274.7 comprises a rotating base arranged above a vehicle chassis, a first crank arm, a first connecting rod, a first connecting block, a second crank arm, a second connecting rod, a second connecting block, a third crank arm, a third connecting block, a fourth crank arm, a fourth connecting rod, a fourth connecting block and a lifting platform, wherein the first crank arm and the first connecting rod are movably connected between the rotating base and the first connecting block, the second crank arm and the second connecting rod are movably connected between the first connecting block and the second connecting block, the third crank arm is movably connected between the second connecting block and the third connecting block, and the fourth crank arm and the fourth connecting rod are movably connected between the third connecting block and the fourth connecting block. This patent adopts the criss-cross two parallelogram of connecting rod to crank the arm structure, makes when guaranteeing stability to crank the arm and packs up highly lower under the state to still be connected with flexible arm and the single parallelogram of cranking on the arm of cranking of two parallelograms and crank the arm, guarantee work platform's lifting height. Compared with the traditional small arm with a parallelogram structure, the small arm has the advantages that the amplitude of the small arm is improved, but the small arm rotates by pushing the third connecting block by the piston rod of the leveling cylinder, and the direction of the piston rod of the leveling cylinder is fixed, so that the rotation range of the small arm is limited, the position to which the small arm can send the working platform is limited, and the use of partial working conditions cannot be met; and the forearm also can't reach the degree roughly parallel with the big arm after withdrawing, and the forearm still wholly is in the outward pendulum state for the big arm, leads to whole car volume great, and the space that needs to occupy when opening the platform truck back factory and park is great.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems of the prior art, namely, the technical problem to be solved by the utility model is to provide a lifting arm assembly, which comprises a big arm body, a small arm body and a variable amplitude connecting device, wherein the lifting end of the big arm body is rotationally connected with the fulcrum end of the small arm body; the variable-amplitude connecting device comprises a first telescopic push rod and a first transmission rod, the rear end of the first telescopic push rod is rotatably connected to the large arm body, the front end of the first telescopic push rod is rotatably connected to the rear end of the first transmission rod, the first transmission rod is located between the large arm body and the small arm body, the front end of the first telescopic push rod is rotatably connected to the pivot end of the small arm body, and telescopic motion of the first telescopic push rod can drive the small arm body to swing relative to the large arm body by driving the whole turning and displacement of the first transmission rod.

As an optimization of the present invention, the variable amplitude connecting device further comprises a guide, the guide is rotatably connected to the first transmission rod, and can restrict the displacement path of the first transmission rod.

As the utility model discloses a preferred, the guide is first direction pendulum rod, first direction pendulum rod upper end is rotated and is connected the lifting end of the forearm body and the lower extreme rotates to be connected the middle part of first transfer link.

As the utility model discloses a preferred, first direction pendulum rod with the rotation tie point of first transfer line arrives the distance of first transfer line rear end is less than to the distance of first transfer line front end.

As the utility model discloses a preferred, hollow first cavity has in the lifting end of the big arm body, first flexible push rod is located can stretch out in the first cavity.

As an optimization of the utility model, the lifting end of the big arm body is provided with a big arm head component for the first guide swing rod to be rotatably connected, the fulcrum end of the small arm body is provided with a small arm head component for the front end of the first transmission rod to be rotatably connected, and the big arm body and the small arm body are rotatably connected through the big arm head component and the small arm head component; a hollow second cavity is formed in the big arm head assembly, a hollow third cavity is formed in the small arm head assembly, the second cavity is communicated with the first cavity, and the third cavity is communicated with the second cavity; the first cavity, the second cavity and the third cavity provide a movable space for the amplitude variation connecting device.

As a preferred aspect of the present invention, the upper arm body points to the upper arm head assembly along the extending direction thereof, and the first cavity points to and communicates with the second cavity along the extending direction of the upper arm body; the small arm head component extends out of one side of the small arm body and is positioned between the small arm body and the large arm body.

The utility model preferably further comprises a working platform, a leveling connecting device and a platform head component, wherein the working platform is arranged on the platform head component, and the platform head component is rotatably connected with the swinging end of the small arm body; leveling connecting device includes flexible push rod of second, second transfer line and second direction pendulum rod, the flexible push rod rear end of second rotates to be connected on the forearm body and the front end rotates to be connected the rear end of second transfer line, second transfer line front end rotates to be connected on the platform head subassembly, second direction pendulum rod rear end rotates to be connected on the forearm body and the front end rotates to be connected the middle part of second transfer line, the flexible push rod of second can be through driving the holistic diversion of second transfer line and displacement promote the platform head subassembly for the forearm body swing.

As the utility model discloses a preferred, the swing end of forearm body has the confession the platform head subassembly with the swing head subassembly that the second direction pendulum rod rotated the connection, be formed with hollow fourth cavity in the swing end of the forearm body, the flexible push rod of second is located in the fourth cavity and can stretch out, be formed with the fifth cavity in the swing head subassembly, be formed with the sixth cavity in the platform head subassembly, the fourth cavity the fifth cavity with the sixth cavity does leveling connecting device provides the activity space.

The straight arm type aerial work platform convenient to transport comprises the lifting arm assembly.

Has the advantages that:

the whole diversion of first transfer line and the range and the scope of displacement are very big, just so make first transfer line and forearm body rotate the rear end of being connected and can the scope of displacement very big, and then make the angle scope that the forearm body can be swung great, realize the wide range of change of forearm body for the big arm body, make the lifting arm assembly can be applicable to various complex environment, reduces the work blind area.

Drawings

FIG. 1 is a schematic diagram of the general structure of the straight arm aerial work platform;

fig. 2 is a schematic structural view of the turntable;

FIG. 3 is a schematic structural view of the intermediate support frame;

FIG. 4 is a schematic view of the partition dividing the receiving groove into an upper groove and a lower groove;

FIG. 5 is a schematic view of the components in the receiving groove;

FIG. 6 is a schematic view of the tailgate;

FIG. 7 is a schematic view of the half-bridge arrangement, the first push rod and the wheel assembly in positional relationship;

FIG. 8 is a schematic view of the general construction of the running chassis;

fig. 9 is a schematic diagram of the half-bridge structure;

FIG. 10 is a schematic view of the mounting bracket;

FIG. 11 is a schematic structural view of the wheel assembly;

FIG. 12 is a schematic view of the lift arm assembly as used in the field of aerial work;

FIG. 13 is a schematic view of the overall configuration of the lift arm assembly;

FIG. 14 is a schematic view of the luffing attachment apparatus when the horn is fully retracted;

FIG. 15 is a schematic view of a first chamber, a second chamber, and a third chamber;

FIG. 16 is a schematic view of the lower arm swinging relative to the upper arm from a fully retracted state to a maximum deployed angle;

FIG. 17 is a schematic view of the luffing attachment apparatus as the forearm body is deployed to a maximum swing angle;

FIG. 18 is a schematic view of the connection between the work platform and the forearm body;

FIG. 19 is a schematic view of the fourth, fifth and sixth chambers;

FIG. 20 is a schematic view of the leveling linkage as the second telescoping ram is extended to a maximum travel;

FIG. 21 is a schematic view of the leveling linkage when the second telescoping ram is fully retracted;

in the figure: a. a running chassis, b, a lifting arm assembly, c, a rotary table, 12, a middle supporting frame body, 121, an accommodating groove, 1211, a lower groove, 1212, an upper groove, 122, a bottom plate, 1221, a bearing part, 123, a side plate, 1231, a tail wing part, 124, a partition plate, 1241, an avoidance port, 125, a rear baffle, 126, a reinforcing rib plate, 1261, an avoidance groove, 13, a side mounting frame body, 131, a side mounting plate, 14, a lifting push rod, 151, a first rotating support rod, 152, a second rotating support rod, 1, a main frame, 2, a wheel assembly, 21, a wheel frame, 22, a tire, 23, a hydraulic motor, 3, an axle unit, 4, a half-bridge structure, 41, a supporting swing arm, 42, a mounting bracket, 43, a parallel swing arm, 421 and an inner extension part, 422, a middle connecting part, 423, an outer extending part, 424, a leaning surface, 51, a first push rod, 52, a second push rod, 6, a large arm body, 61, a large arm body component, 7, a small arm body, 71, a small arm body component, 72, a swinging head component, 8, a variable amplitude connecting device, 81, a first telescopic push rod, 82, a first transmission rod, 83, a first guide swing rod, 91, a first cavity, 92, a second cavity, 93, a third cavity, 94, a fourth cavity, 95, a fifth cavity, 96, a sixth cavity, 10, a working platform, 101, a platform head component, 11, a leveling connecting device, 111, a second telescopic push rod, 112, a second transmission rod, 113 and a second guide swing rod.

Detailed Description

The following specific embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws and protection within the scope of the present invention.

The first embodiment is as follows:

the utility model relates to a running chassis that can expand bridge in situ, including main frame 1, wheel subassembly 2 and two axle units 3 around, axle unit 3 sets up and rotates respectively including controlling two symmetries and is connected half-bridge structure 4 on the main frame 1, every keep away from on the half-bridge structure 4 the one end of main frame 1 all rotates and is connected with wheel subassembly 2. In order to realize the axle expansion function, the front and rear axle units 3 need to be capable of respectively expanding the axle, that is, the left and right half-bridge structures 4 in one axle unit 3 can be far away from each other and close to each other. The axle unit 3 therefore also comprises first thrust means capable of pushing the half-bridge structure 4 to oscillate in a horizontal direction with respect to the main frame 1, and second thrust means capable of pushing the wheel unit to rotate in a horizontal direction with respect to the half-bridge structure 4 until the rolling direction of the wheel assembly 2 substantially coincides with the oscillation tangential direction of the half-bridge structure 4; when the axle is expanded, the wheel assembly 2 is pushed by the second pushing device and is rotated until the rolling direction of the wheel assembly is substantially consistent with the swinging tangential direction of the half-bridge structures 4, then the first pushing device is started to push the half-bridge structures 4 to swing outwards relative to the main frame 1, namely, the left half-bridge structure 4 and the right half-bridge structure 4 in one axle unit 3 swing oppositely, and the wheel assembly 2 synchronously rolls and advances in a swinging process, so that the in-situ axle expansion of the running chassis is realized. In the bridge expansion process, the motion form of the wheel assembly 2 is rolling, the friction force between the wheel assembly and the ground is mixed friction, and compared with sliding friction, the rolling friction is easier to overcome, so that the thrust requirement on the first pushing device in the bridge expansion process is lower, and the cost is controlled; the rolling of the wheel assembly 2 also avoids wear and noise generation.

The driving chassis is mainly used in the field of aerial platform trucks, and four-wheel drive is usually selected in the field to ensure the trafficability of the aerial platform truck, so the present embodiment preferably includes the wheel carrier 21, the tire 22 mounted on the wheel carrier 21, and a motor for driving the tire 22, so as to realize four-wheel drive. In the case of the bridge expansion, one embodiment is that the motor drives the tire 22 to roll during the process of the first pushing device pushing the half-bridge structure 4 to swing, so as to further reduce the requirement of the bridge expansion motion for the pushing force of the first pushing device and reduce the cost of the first pushing device. However, the combination of the two different forms of power can cause the total axle expanding power to be difficult to master, the wheel assembly 2 itself runs in a rolling mode, and as long as the resistance of the rotation of the tire 22 in the wheel assembly 2 under the action of external force is small, the axle expanding by means of the thrust of the first thrust device only does not have high requirements on the thrust. Therefore, in the present embodiment, it is preferable that the motor is a hydraulic motor 23, and the hydraulic motor 23 is connected to a bypass valve through a pipeline, and the bypass valve can bypass an oil path of the hydraulic motor 23 after being opened, so that the hydraulic motor 23 can rotate under the action of external force; when expanding the bridge, open the bypass valve makes A hydraulic fluid port and the bypass of B hydraulic fluid port in the hydraulic motor 23, then when hydraulic motor 23 self does not start, its main shaft can rotate under the exogenic action, like this in the swing of half-bridge structure 4, just can promote tire 22 and roll, need not the power with the help of hydraulic motor 23, the cost is reduced, and only the thrust through a thrust of a thrust device carries out the swing of half-bridge structure 4 in addition, also is more convenient for control whole bridge process that expands. Of course, a speed reducer is usually provided between the hydraulic motor 23 and the tire 22, and the brake of the speed reducer must be released during axle expansion.

In general, the axle expanding movement of the axle unit 3 is that the left and right half-bridge structures 4 swing away from each other at the same time, and one embodiment of the first pushing device may push the left and right half-bridge structures 4 to swing at the same time, and another embodiment may push the left and right half-bridge structures 4 to swing separately. However, in the present embodiment, the left and right half-bridge structures 4 are highly independent and have less structural relationship with each other, so that the second embodiment is preferable, and the individual swing of the half-bridge structures 4 can be satisfied. Specifically, it is preferable that the half-bridge structure 4 includes a supporting swing arm 41, the first pushing device includes a left push rod 51 and a right push rod 51 acting on the same side of the half-bridge structure 4, one end of the first push rod 51 is rotatably connected to the main frame 1, and the other end of the first push rod 51 is rotatably connected to a swing end of the supporting swing arm 41, the swing end is away from one end of the main frame 1, and the first push rod 51, the supporting swing arm 41 and the main frame 1 form a triangular structure, so that the first push rod 51 is extended and retracted to push the supporting swing arm 41 to swing, and the first push rod 51 itself also swings in the process. Therefore, the swing angle range of the supporting swing arm 41 is large, the structural stability is high, the stability of the bridge is improved, and the supporting strength of the supporting swing arm 41 to the whole running chassis is improved.

Before axle expansion, a second pushing device is needed to push the wheel assembly 2 to rotate until the rolling direction of the wheel assembly 2 is approximately consistent with the swing tangential direction of the half-bridge structure 4, the wheel assembly 2 on the left side in the axle unit 3 is installed on the half-bridge structure 4 on the left side, and the wheel assembly 2 on the right side is installed on the half-bridge structure 4 on the right side. The driving chassis of the embodiment has two use states before and after the axle expansion, one is a normal driving posture before the axle expansion, and at this time, the driving chassis is made as narrow as possible in order to ensure trafficability, so in this embodiment, the whole half-bridge structures 4 are approximately in a front-back extension state, one ends of the two half-bridge structures 4 far away from the main frame 1 are close to each other, the two wheel assemblies 2 are also close to each other, and the whole driving chassis is in a narrowest state; the other is a stop state after axle expansion, at this time, the left half-bridge structure 4 and the right half-bridge structure 4 in the axle unit 3 deviate from each other by a large swing angle, and the left wheel assembly 2 and the right wheel assembly 2 are far away from each other. If the second pushing device adopts a set of structure to act on the left wheel assembly 2 and the right wheel assembly 2 simultaneously, when the axle is expanded under the normal driving posture, the left half-bridge structure and the right half-bridge structure 4 are too close to each other, and interference may occur in the process that the left half-bridge structure and the right half-bridge structure rotate to the state that the rolling direction of the left half-bridge structure and the right half-bridge structure are basically consistent with the swinging tangential direction, so that the left half-bridge structure and the right half-bridge structure cannot rotate in place; in the above-described attitude after axle expansion, the distance between the left and right wheel assemblies 2 is large, and the second pushing device itself needs a large stroke, resulting in an increase in cost. Therefore, in this embodiment, it is preferable that the half-bridge structure 4 further includes a mounting bracket 42 mounted at the swing end of the supporting swing arm 41, and the wheel assembly 2 is rotatably connected to the mounting bracket 42 through the wheel carrier 21; the second pushing device comprises a left second pushing rod 52 and a right second pushing rod 52 which respectively act on the wheel assembly 2 on the same side, one end of the second pushing rod 52 is rotatably mounted on the mounting bracket 42, the other end of the second pushing rod 52 is rotatably connected with the wheel frame 21, and the second pushing rod 52 can push the wheel assembly 2 to rotate through extension and retraction. The mounting bracket 42 is used for mounting the second push rods 52, so that the left and right second push rods 52 can independently operate respectively, the range of the rotatable angle of the wheel assembly 2 can be ensured to meet the requirement only by ensuring the stroke of the second push rods, and the cost is low; and the wheel assemblies 2 are arranged, so that a certain distance is kept between the left wheel assembly 2 and the right wheel assembly 2 when the left wheel assembly and the right wheel assembly are close to each other, and the interference between the left wheel assembly and the right wheel assembly is avoided when the left wheel assembly and the right wheel assembly rotate.

In a further improvement, preferably, the mounting bracket 42 includes an inner protruding portion 421, an outer protruding portion 423 and an intermediate connecting portion 422 therebetween, the swing end of the supporting swing arm 41 is rotatably connected to the intermediate connecting portion 422, the wheel assembly 2 is mounted on the outer protruding portion 423, one end of the second push rod 52 is rotatably connected to the inner protruding portion 421, and the other end of the second push rod 52 is rotatably connected to the wheel carrier 21 of the wheel assembly 2. The mounting bracket 42 not only ensures stable mounting of the second push rod 52, but also the second push rod 52 straddles the mounting bracket 42, and the length of the mounting bracket 42 in the horizontal direction is utilized to effectively ensure the extension and contraction stroke of the second push rod 52. And when two wheel assembly 2 on the left and right sides are close to each other before expanding the bridge, have two installing support 42 between the two at the interval, further guarantee that two wheel assembly 2 can not take place to interfere each other when rotating.

During the axle expansion process, it is required to ensure that the rolling direction of the tire 22 in the wheel assembly 2 is substantially consistent with the swing tangential direction of the swing end of the support swing arm 41, which is realized by controlling the angular relationship between the wheel assembly 2 and the support swing arm 41, but the existence of the mounting bracket 42 can affect the angular relationship between the wheel assembly 2 and the support swing arm 41; there are two embodiments, the first is that the mounting bracket 42 is fixedly connected with the supporting swing arm 41, so that the mounting bracket 42 does not affect the angle relationship between the wheel assembly 2 and the supporting swing arm during the axle expanding process, but the mounting bracket 42 is only fixed on the supporting swing arm 41, and the stability is low; the second is that the mounting bracket 42 is rotatably connected with the supporting swing arm 41, so that the mounting bracket 42 may rotate relative to the supporting swing arm 41 in the axle expanding process, which causes the angle relationship between the wheel assembly 2 and the supporting swing arm 41 to be affected, and certainly, the influence of the mounting bracket 42 can still be eliminated by setting an angle sensor, a controller and the like to control the rotation angle of the wheel assembly 2, but too many variables may cause the algorithm to be complicated, the cost is increased, and the accuracy of actual angle matching is reduced, which may cause adverse effect on axle expanding. In consideration of the problems faced by the above two embodiments, this embodiment is further improved, preferably, the half-bridge structure 4 further includes a parallel swing arm 43 with one end rotatably connected to the main frame 1 and the other end rotatably connected to the inner extension 421 of the mounting bracket 42, the parallel swing arm 43 is parallel to the supporting swing arm 41, the parallel swing arm 43, the mounting bracket 42 and the main frame 1 form a parallelogram structure, and the mounting bracket 42 and the swing end of the supporting swing arm 41 are rotatably connected. Like this half-bridge structure 4 is a whole by supporting swing arm 41, parallel swing arm 43 and installing support 42 are constituteed, wherein support swing arm 41 is the major function structure, parallel swing arm 43 with support swing arm 41 synchronous oscillation, parallel swing arm 43's existence not only can share and support swing arm 41 to the holistic supporting role in driving the chassis, improve the holistic intensity of half-bridge structure 4 and bearing capacity, and improved the firm degree of installation of installing support 42 in half-bridge structure 4, also make the steadiness of installing support 42 in the 4 motion processes of half-bridge structure simultaneously, and then guarantee that wheel subassembly 2 and the accurate of supporting the position relation between swing arm 41 can be surveyed. Because of the parallelogram structure of the half-bridge structure 4 and the four rotary connecting parts, the supporting swing arm 41 and the parallel swing arm 43 keep parallel synchronous swing in the bridge expansion process, the mounting bracket 42 is always parallel to the connecting line of the half-bridge structure 4 between the two rotary connecting parts on the main frame 1, and the two rotary connecting parts, namely the rotary connecting parts of the supporting swing arm 41, the parallel swing arm 43 and the main frame 1, in a word, the whole position direction of the mounting bracket 42 is determined, and the mounting bracket 42 is wholly translated in the bridge expansion process, so the mounting bracket 42 does not influence the position precision of the wheel assembly 2. Therefore, in the axle expanding process, as long as two variables, namely the swing angle of the supporting swing arm 41 and the rotation angle of the wheel assembly 2, are controlled, the rolling direction of the wheel assembly 2 is basically consistent with the swing tangential direction of the half-bridge structure 4, and smooth axle expanding is further realized.

For the control of the swing angle of the support swing arm 41 and the rotation angle of the wheel assembly 2, real-time accurate monitoring and feedback are required, and therefore need to be achieved by a control system. Specifically, it is preferable in this embodiment that the axle unit 3 further includes a first angle sensor, a second angle sensor, and a bridge expansion controller, the first angle sensor can detect the swing angle of the supporting swing arm 41 and transmit the swing angle to the bridge expansion controller, the second angle sensor can detect the rotation angle of the wheel assembly 2 and transmit the rotation angle to the bridge expansion controller, the bridge expansion controller is connected to the first push rod 51 and the second push rod 52 by wires, and a first module that matches the swing angle of the supporting swing arm 41 with the rotation angle of the wheel assembly 2 by controlling the first push rod 51 and the second push rod 52 is provided in the bridge expansion controller. In practical experiments, it can be known that, under the condition that the rolling direction of the wheel assembly 2 is always kept substantially consistent with the swing tangential direction of the half-bridge structure 4, the rotation angle of the wheel assembly 2 corresponding to each swing angle of the support swing arm 41 needs to be written into the first module, and by taking the rotation angle as a reference, the first module controls the two angles to always keep corresponding in real time in the actual axle expanding process, so that smooth axle expanding is realized.

In the embodiment, the driving chassis is as narrow as possible in a normal driving posture to ensure the trafficability characteristic, so that the left half-bridge structure and the right half-bridge structure 4 are close to each other in the normal driving posture to reduce the width of the driving chassis, and the width of the driving chassis can meet the requirements of transportation carriers such as common freight cabinets, flat cars and the like on width dimension for loading, thereby facilitating transportation and reducing transportation cost; when the running chassis is used on an aerial work platform to form a whole vehicle, the two half-bridge structures 4 are close to each other, so that the width of the whole vehicle can be reduced, the width size requirement of transportation carriers such as common freight cabinets, flat cars and the like can be met, the transportation is convenient, and the transportation cost is reduced.

After being close to each other, the two half-bridge structures 4 can leave a little distance between the two, also can lean on each other to reduce the width as much as possible, and not only make the width about driving chassis narrower under the condition of leaning on each other, still make two half-bridge structures 4 support each other, and then guarantee the holistic stability of axle unit 3. When the chassis is changed from the axle-expanding posture to the normal driving posture, the left and right half-bridge structures 4 swing in opposite directions until abutting against each other, so in this embodiment, it is preferable that the inner protruding portion 421 of the mounting bracket 42 has an abutting surface 424 facing away from the wheel assembly 2, the left and right half-bridge structures 4 in the axle unit 3 can abut against each other through the abutting surface 424, and a cushion pad is disposed on the abutting surface 424, so as to reduce damage and noise caused by collision. Further, preferably, the first pushing device further comprises a swing oil cylinder, and the swing oil cylinder provides power for the first push rod 51; the second pushing device further comprises a steering oil cylinder, and the steering oil cylinder provides power for the second push rod 52. The power form of the oil cylinder is adopted, so that enough driving force is provided for the first push rod 51 and the second push rod 52, and smooth realization of bridge expansion operation is ensured.

The travelling chassis can be used in existing aerial platform trucks, but also in aerial platform trucks according to the second and third embodiments below. The utility model relates to an aerial working platform, include the chassis of traveling.

The second embodiment:

the utility model relates to a lifting arm assembly, including the big arm body 6, the forearm body 7 and become width of cloth connecting device 8, big arm body 6 self also can swing, and consequently its wobbling one end is the lifting end, and the one end that the forearm body 7 was installed on big arm body 6 then is the fulcrum end, the lifting end of big arm body 6 with the fulcrum end of the forearm body 7 rotates the connection. The variable-amplitude connecting device 8 comprises a first telescopic push rod 81 and a first transmission rod 82, the rear end of the first telescopic push rod 81 is rotatably connected to the large arm body 6, the front end of the first telescopic push rod 81 is rotatably connected to the rear end of the first transmission rod 82, the first transmission rod 82 is positioned between the large arm body 6 and the small arm body 7, and the front end of the first transmission rod is rotatably connected to the pivot end of the small arm body 7; the amplitude-variable connecting device 8 drives the small arm body 7 to rotate relative to the large arm body 6, so that the large arm body 6 can be regarded as a static reference during motion analysis, and the front end and the rear end of the first transmission rod 82 are movable relative to the large arm body 6 in the process of being pushed to move, so that the first transmission rod 82 changes direction and moves integrally, and the small arm body 7 swings along with the movement of the front end of the first transmission rod 82; specifically, the first telescopic push rod 81 performs telescopic motion to drive the rear end of the first transmission rod 82 to generate synchronous same-path displacement, and meanwhile, the first transmission rod 82 generates direction change to pull or push the small arm body 7 to generate swing relative to the large arm body 6, and because the first transmission rod 82 is not limited by other parts on the whole, the amplitude and range of the whole direction change and displacement are very large, so that the range of the rear end of the rotary connection between the first transmission rod 82 and the small arm body 7, which can be displaced, is very large, the angle range of the small arm body 7, which can swing, is relatively large, the wide amplitude of the small arm body 7 relative to the large arm body 6 is realized, the lifting arm assembly can be suitable for various complex environments, and the work blind area is reduced. When the lifting arm assembly is not used, the large arm body 6 and the small arm body 7 can be completely pulled back, the state that the small arm body 7 is approximately parallel to the large arm body 6 is achieved, as shown in the state of fig. 1, the compactness is improved, the occupied space of the lifting arm assembly is reduced, the storage space cost is reduced, and particularly when common transport vehicles such as freight cabinets and the like are used for transporting, the total length and the height of the lifting arm assembly in the retraction state of fig. 1 can meet the requirements of cabinet loading, the transportation is convenient, and the transportation cost is reduced; simultaneously the lifting arm assembly is mainly used for being installed on the high-altitude operation car for use, the improvement of compactness under the state that the lifting arm assembly is wholly withdrawn is also favorable for guaranteeing the trafficability characteristic of the high-altitude operation car, and the length of the high-altitude operation car is reduced, so that the total length and the total height of the high-altitude operation car can meet the loading requirements of common transport carriers such as freight cabinets and the like, the transportation is convenient, and the transportation cost is reduced. In the process of the movement of the first driving rod 82, the front end of the first telescopic push rod 81 can displace in the up-down direction along with the displacement of the rear end of the first driving rod 82 in the self telescopic path, so that the rear end of the first telescopic push rod 81 is rotatably connected to the boom body 6, and the first telescopic push rod 81 can swing relative to the boom body 6 in the up-down direction.

Because the motion track of the first transmission rod 82 is difficult to determine, in the above-mentioned solution, some conditions can smoothly realize the pushing of the small arm body 7, but some conditions cannot realize the pushing, which results in insufficient reliability. Therefore, in the embodiment, it is preferable that the variable-amplitude connecting device 8 further includes a guide member, the guide member is rotatably connected to the first transmission rod 82, and can limit a displacement path of the first transmission rod 82, and in a process that the first transmission rod 82 is pushed by the first telescopic push rod 81, a path of a rotatably connected portion of the first transmission rod 82 and the guide member is limited and determined by the guide member, so that a running track of the whole first transmission rod 82 is determined, and the first transmission rod 82 still rotates relative to the guide member, so that the first transmission rod 82 changes direction, and the displacement of the front end of the first transmission rod 82 is still superimposed on two forms of displacement and direction change of the whole first transmission rod 82, and the variable-amplitude swing of the small arm 7 relative to the large arm 6 can still be realized. Specifically, preferably, the guide member is a first guide swing rod 83, the upper end of the first guide swing rod 83 is rotatably connected to the lifting end of the upper arm body 6, the lower end of the first guide swing rod 83 is rotatably connected to the middle of the first transmission rod 82, the first guide swing rod 83 swings relative to the upper arm body 6, the lower end of the first guide swing rod 83 is a swinging end, and the trajectory is determined, so that the running trajectory of the part of the first transmission rod 82 rotatably connected with the first guide swing rod 83 is determined, under the condition that the first transmission rod 82 is not considered to change direction and rotates relative to the first guide swing rod 83, the overall displacement trajectory of the first transmission rod 82 is determined, and it is ensured that the first transmission rod 82 can always drive the lower arm body 7 to swing in the process that the first telescopic push rod 81 pushes the first transmission rod 82. Specifically, fig. 4 shows an initial state in which the small arm body 7 is completely retracted below the large arm body 6, the small arm body 7 is rotatably connected to the large arm body 6 through the extreme end, the first transmission rod 82 is located in a space between the large arm body 6 and the small arm body 7 and is obliquely supported between the small arm body 7 and the large arm body 6, the first guide swing rod 83 pulls the first transmission rod 82 to limit the track of the first transmission rod 82, as long as the first telescopic push rod 81 extends outwards, the rear end of the first transmission rod 82 can only move obliquely downwards, the front end of the first transmission rod 82 tilts obliquely upwards, and the first transmission rod 82 changes direction with the rotating connection portion with the guide swing rod as a fulcrum, so as to push the small arm body 7 to swing away from the large arm body 6; meanwhile, the first transmission rod 82 is displaced as a whole by taking the swing track of the rotation connection part with the first guide swing rod 83 as a whole displacement track, and pushes the small arm body 7 to swing away from the large arm body 6 in cooperation with the self direction-changing motion. In summary, in the process that the first transmission rod 82 is pushed outwards by the first telescopic push rod 81, the first transmission rod 82 simultaneously generates the overall displacement swinging outwards along with the first guide swing rod 83 and the movement that the front end continuously tilts upwards relative to the rotation of the first guide swing rod 83, so that the two movement forms are superposed and then act on the small arm body 7, and the small arm body 7 can generate the wide amplitude swing relative to the large arm body 6. FIG. 5 shows the state of the small arm 7 after swinging to the maximum angle from the initial state of complete retraction, and compared with FIG. 4, the maximum swinging angle can reach 230 to 240 degrees, which greatly improves the working angle range of the lifting arm assembly, is suitable for various complex working conditions, and reduces the working blind area; and the amplitude-variable connecting device 8 can retract the small arm body 7 to be in a state of being approximately parallel to the large arm body 6, so that the total length of the lifting arm assembly is greatly reduced when the lifting arm assembly is not used, the space cost is reduced, and the trafficability characteristic is improved.

Fig. 6 shows a state that the small arm body 7 swings to a maximum angle relative to the large arm body 6, at this time, the first telescopic push rod 81 is substantially parallel to the first guide swing rod 83, the first guide swing rod 83 blocks the first telescopic push rod 81 from the rotary connection part of the large arm body 6, and reaches an extreme state, and cannot be pushed further, and the first guide swing rod 83 reaches the maximum swing angle, that is, the overall displacement generated by the first transmission rod 82 following the swing of the first guide swing rod 83 reaches a maximum degree; on the other hand, at this time, the rotation of the first transmission rod 82 relative to the first guide swing rod 83 also reaches the maximum angle, the front end of the first transmission rod 82 turns over backward and upward to be close to the rotation connection part of the first guide swing rod 83 and the large arm body 6, and the fulcrum end of the small arm body 7 abuts against the lifting end of the large arm body 6 to reach the limit state. Analyzing that the two motion forms of the first transmission rod 82 reach the limit state, determining that the first guide swing rod 83 reaches the limit state, and determining that the first transmission rod 82 rotates to the limit state relative to the first guide swing rod 83 is also related to the selection of the part of the first transmission rod 82, which is rotatably connected with the first guide swing rod 83; the first transmission lever 82 is shaped like a lever and divided into a force transmission arm portion acting on the forearm body 7 and a power arm portion pushed by the first telescopic push rod 81 by using the rotation connection portion of the first transmission lever 83 and the first guide swing rod 83 as a boundary, wherein the rotation of the force transmission arm portion is considered to be effective work acting on the forearm body 7, the closer the rotation connection point of the first guide swing rod 83 and the first transmission lever 82 is to the front end of the first transmission lever 82, the shorter the length of the force transmission arm portion is, and the longer the length of the power arm portion is, the longer the maximum stroke of the first telescopic push rod 81 is required to be extended when the first transmission lever 82 is rotated to the same limit state relative to the first guide swing rod 83, and at this time, the ratio of the length of the power arm portion in the first transmission lever 82 to the entire length is also large, and the portion is extended to the outside as the first telescopic push rod 81, which lowers the structural stability and compactness, and the increase of the maximum stroke of the first telescopic push rod 81 also causes the increase of the cost thereof. Therefore, in the present embodiment, it is preferable that the distance from the pivotal connection point of the first guiding swing link 83 and the first transmission link 82 to the rear end of the first transmission link 82 is smaller than the distance to the front end of the first transmission link 82, so as to reduce the requirement for the maximum stroke of the first telescopic push rod 81, increase the length ratio of the force transmission arm portion acting on the small arm body 7 in the first transmission link 82, obtain more effective work on the small arm body 7, reduce the length ratio of the power arm portion in the first transmission link 82, and improve the structural stability and compactness.

The first telescopic push rod 81 has a length change in the telescopic process, and a moving space needs to be provided for the first telescopic push rod 81, in this embodiment, it is preferable that a hollow first cavity 91 is provided in the lifting end of the upper arm body 6, and the first telescopic push rod 81 is located in the first cavity 91 and can extend out; under the state that the forearm body 7 withdraws, the forearm body 7 is close to the big arm body 6, and the whole withdrawal of first telescopic push rod 81 is in first cavity 91 this moment, realizes dodging to the forearm body 7, can not influence the complete withdrawal of the forearm body 7, when needs push out the forearm body 7, then first telescopic push rod 81 stretches out from first cavity 91, outwards promotes first transfer link 82.

The body of the large arm body 6 and the body of the small arm body 7 are both long-strip-shaped support arms, and in order to facilitate the rotational connection between the two and the arrangement of the variable amplitude connecting device 8, in this embodiment, it is preferable that the lifting end of the large arm body 6 is provided with a large arm head assembly 61 for rotationally connecting the first guide swing rod 83, the fulcrum end of the small arm body 7 is provided with a small arm head assembly 71 for rotationally connecting the front end of the first transmission rod 82, and the large arm body 6 and the small arm body 7 are rotationally connected through the large arm head assembly 61 and the small arm head assembly 71; a hollow second cavity 92 is formed in the big arm head assembly 61, a hollow third cavity 93 is formed in the small arm head assembly 71, the second cavity 92 is communicated with the first cavity 91, and the third cavity 93 is communicated with the second cavity 92; the first cavity 91, the second cavity 92 and the third cavity 93 provide a movable space for the amplitude-variable connecting device 8. Specifically, the forearm head assembly 61 includes two left and right first support plates, the second cavity 92 is a space clamped between the two first support plates, the forearm head assembly 71 includes two left and right second support plates, and the third cavity 93 is a space clamped between the two second support plates, so that the variable-amplitude connecting device 8 can realize planar motion in a plane perpendicular to the left and right directions in the second cavity 92 and the third cavity 93, and thereby the forearm body 7 is pushed to swing relative to the forearm body 6 in the same plane. Of course, during the actual movement of the luffing attachment 8, there will be portions that extend outside the first, second and third chambers 91, 92, 93, the presence of the first, second and third chambers 91, 92, 93 being primarily intended to avoid movement of the luffing attachment 8. In a further improvement, preferably, the upper arm body 6 points to the upper arm head assembly 61 along the extending direction thereof, and the first cavity 91 points to and communicates with the second cavity 92 along the extending direction of the upper arm body 6; the small arm head assembly 71 extends out of one side of the small arm body 7 and is positioned between the small arm body 7 and the large arm body 6. The boom head assembly 61 is thus integrated with the body of the boom 6, so that the entire boom 6 is still in the form of a long bar, and the boom head assembly 61 serves as a reference for motion analysis of the luffing attachment device 8 and the boom 7, which can represent the rest of the body of the boom 6. The small arm head assembly 71 extends out of one side of the small arm body 7 to facilitate the rotary connection with the large arm head assembly 61, the small arm body 7 is also of an elongated support arm structure, the body of the small arm body 7 is approximately parallel to the large arm body 6 under the condition that the small arm body 7 is completely retracted, and in the state, the small arm head assembly 71 must extend out of one side of the body of the small arm body 7 to be connected with the large arm head assembly 61 in a rotary mode.

The lifting arm assembly is mainly the same as the field of aerial work platforms, a working platform 10 is usually required to be installed at the swinging end of a small arm body 7, the large arm body 6 and the small arm body 7 jointly lift the working platform 10 in the working process, but the working platform 10 can meet the use requirement only by always keeping a horizontal state, and therefore a leveling mechanism for leveling the working platform 10 is usually required to be equipped; in the above scheme, the variable amplitude connecting device 8 realizes the wide amplitude of the swing of the small arm body 7 relative to the large arm body 6, which requires that the leveling angle range of the leveling mechanism is also large enough to correspondingly satisfy the wide amplitude of the small arm body 7, i.e. the matching of the leveling mechanism and the variable amplitude connecting mechanism needs to be realized, and obviously, the existing leveling mechanism cannot satisfy the requirements. The lifting arm assembly of the embodiment further comprises a working platform 10, a leveling connecting device 11 and a platform head assembly 101, wherein the working platform 10 is installed on the platform head assembly 101, and the platform head assembly 101 is rotatably connected with the swinging end of the small arm body 7; leveling connecting device 11 includes second telescopic push rod 111, second transfer line 112 and second direction pendulum rod 113, second telescopic push rod 111 rear end rotates to be connected on the forearm body 7 and the front end rotates to be connected the rear end of second transfer line 112, second transfer line 112 front end rotates to be connected on the platform head subassembly 101, second direction pendulum rod 113 rear end rotates to be connected on the forearm body 7 and the front end rotates to be connected the middle part of second transfer line 112, second telescopic push rod 111 can drive the holistic diversion of second transfer line 112 and displacement promote platform head subassembly 101 for the swing of forearm body 7. Fig. 9 shows the above specific structure, the structural principle of the leveling connection device 11 is consistent with that of the luffing connection device 8, the second guide swing rod 113 limits the motion track of the second transmission rod 112 as a whole, the second transmission rod 112 can rotate relative to the second guide swing rod 113, and the superposition of the two motion forms enables the front end of the second transmission rod 112, which is rotatably connected with the platform head assembly 101, to generate a wide luffing displacement, so that the range of the rotation angle of the platform head assembly 101 relative to the forearm 7 is large, compared with the position of the platform head assembly 101 in two extreme states of complete extension and complete retraction of the second telescopic push rod 111, the range of the rotation angle of the platform head assembly 101 is also approximately 230 ° -240 °, so that the matching between the range of the luffing of the platform head assembly 101 and the range of the forearm 7 is realized, and the leveling connection device 11 can rotate the platform head assembly 101 to a certain angle to keep the working platform 10 horizontal no matter the rotation of the forearm body 7 to any angle.

In order to facilitate the installation of the platform head assembly 101 and the leveling connecting device 11 and provide a movable space for the leveling connecting device 11, it is further preferable that the swing end of the forearm body 7 is provided with a swing head assembly 72 for rotationally connecting the platform head assembly 101 and the second guide swing rod 113, a hollow fourth cavity 94 is formed in the swing end of the forearm body 7, the second telescopic push rod 111 is located in the fourth cavity 94 and can extend out, a fifth cavity 95 is formed in the swing head assembly 72, a sixth cavity 96 is formed in the platform head assembly 101, and the fourth cavity 94, the fifth cavity 95 and the sixth cavity 96 provide a movable space for the leveling connecting device 11. In this embodiment, the first telescopic push rod 81 and the second telescopic push rod 111 are preferably powered by oil cylinders.

The lifting arm assembly can be used in the existing aerial platform vehicle, and can also be used in the aerial platform in the first embodiment and the third embodiment of the specification. The utility model relates to a straight arm-type aerial working platform convenient to transportation, include lifting arm assembly.

Example three:

the utility model relates to a straight arm-type aerial working platform convenient to transportation, including the chassis a that traveles, install revolving stage c on the chassis a that traveles and installing lifting arm assembly b on the revolving stage c, revolving stage c can wind a vertical axis produce for the rotation on the chassis a that traveles, lifting arm assembly b then can produce for revolving stage c's swing is realized lifting. The lifting arm assembly b comprises a large arm body 6, a small arm body 7 and a variable amplitude connecting device 8, wherein the variable amplitude connecting device 8 can push the small arm body 7 to perform wide variable amplitude swing relative to the large arm body 6, the moving range of the whole gravity center of the lifting arm assembly b is large, and the requirement on the stability of the whole operation platform is high. Therefore, the travelling chassis a can expand the bridge in situ, the supporting capability of the travelling chassis a on the turntable c and the lifting arm assembly b is improved, and the stability of the whole operation platform is also improved. The turntable c comprises a middle supporting frame body 12 and side mounting frame bodies 13 fixed on the left side and the right side of the middle supporting frame body 12, wherein the middle supporting frame body 12 is used for mounting the lifting arm assembly b, and the side mounting frame bodies 13 are used for mounting various driving systems, control systems and the like; be formed with in the middle support frame body 12 and extend and open up the groove 121 of accomodating along the fore-and-aft direction, the rotation end of the big arm body 6 stretches into accomodate in the groove 121 and rotate and install middle support frame body 12 rear portion, it is located to accomodate being provided with in the groove 121 the lifting push rod 14 of big arm body 6 below, the rotation of lifting push rod 14 front end is connected and is stretched into in big arm body 6 below rear end accomodate in the groove 121 and rotate and install on middle support frame body 12, lifting push rod 14 promotes through flexible big arm body 6 for the swing of middle support frame body 12. The accommodating groove 121 is defined by the solid structure of the middle support frame 12, and the rotating end of the large arm body 6 and the rear end of the lifting push rod 14 extend into the accommodating groove 121 and are mounted on the solid structure of the middle support frame 12, so that the whole middle support frame 12 can be stably supported, and the middle support frame can be stably maintained in the process of wide-amplitude movement of the small arm body 7. Preferably the lifting ram 14 is driven by a hydraulic ram.

In this embodiment, the middle supporting frame 12 includes a bottom plate 122 and a left side plate 123 and a right side plate 123, the bottom plate 122 and the left side plate 123 enclose the storage groove 121, a first rotating support rod 151 for the lifting push rod 14 to rotate and mount and a second rotating support rod 152 for the upper arm 6 to rotate and mount are disposed in the storage groove 121, and the first rotating support rod 151 and the second rotating support rod 152 are horizontally erected between the left side plate 123 and the right side plate in a left-right direction. First rotation branch 151 and second rotation branch 152 are fixed on middle braced frame body 12, and its structural strength and stability are higher, and then middle braced frame body 12 is to the intensity and the stability of the supporting role of forearm body 6 and lifting push rod 14, and first rotation branch 151 wears to establish in the rotation end of forearm body 6, makes the forearm body 6 rotate, second rotation branch 152 wears to establish in the rear end of lifting push rod 14, makes lifting push rod 14 can rotate. Further improve, preferably middle support frame 12 still includes transversely erects two about baffle 124 between the curb plate 123, baffle 124 will accomodate groove 121 and divide into upper groove 1212 and lower groove 1211, first rotation branch 151 is located in lower groove 1211, second rotation branch 152 is located in upper groove 1212, the last mouth 1241 of dodging that link up from top to bottom that has of baffle 124, lifting push rod 14 can pass through dodge mouth 1241 and swing to in the upper groove 1212, guarantee lifting push rod 14 to the lift effect of forearm body 6. The partition plate 124 not only strengthens the structural strength of the middle support frame body 12, but also separates the first rotating support rod 151 and the second rotating support rod 152 into the upper groove 1212 and the lower groove 1211, so that the middle support frame body 12 is stressed uniformly, the stress concentration degree at a certain position of the middle support frame body 12 is reduced, and the service life is prolonged; the partition 124 can also support the boom 6 to a certain extent in a state where the entire boom 6 is laid down in the lateral direction.

The large arm body 6 moves in the upper groove 1212 and the space above the upper groove 1212, and the rotating end of the large arm body 6 mainly extends into the upper groove 1212, so that it is preferable that the left and right side plates 123 have tail wing portions 1231 which are located at the rear and protrude upward, the tail wing portions 1231 are located above the partition plate 124, and the upper groove 1212 is defined by the left and right tail wing portions 1231 and the partition plate 124. Thus, the upper groove 1212 is used only to receive the pivoting end of the upper arm 6, reducing the material cost of the side plate 123. Thus, the upper groove 1212 is only a small portion located at the rear of the middle support frame 12, and the lower groove 1211 is still an elongated cavity extending in the front-rear direction and formed by sandwiching the main body portion of the side plate 123 except the tail portion 1231. Further improve, preferably middle braced frame 12 still includes backplate 125, backplate 125 sets up two about between the curb plate 123 and from the rear shutoff accomodate the groove 121, backplate 125 has both improved middle braced frame 12's structural strength and stability, can cover first rotation branch 151 and second rotation branch 152 position again, avoids the foreign matter to get into the influence and rotates, plays the guard action.

In a further improvement, preferably, the middle supporting frame 12 further includes a reinforcing rib plate 126 disposed in the lower groove 1211, the reinforcing rib plate 126 is upright and is simultaneously fixedly connected to the side plate 123 and the bottom plate 122, so as to support and reinforce the middle supporting frame 12, and the reinforcing rib plate 126 is provided with an avoiding groove 1261 with an upward opening, so as to avoid interference between the lifting push rod 14 and the reinforcing rib plate 126 during the swinging process. Preferably, the bottom plate 122 has a bearing portion 1221 extending below the side mounting frame 13, and the side mounting frame 13 is located on the bearing portion 1221 and fixedly connected to the bearing portion 1221, so that the side mounting frame 13 and the intermediate support frame 12 are more compact and more integrated, and the mounting stability of the side mounting frame 13 is also improved. Further, it is preferable that the side attachment frame 13 includes a side attachment plate 131 which is fixed to the side plate 123 of the intermediate support frame 12 in a abutting manner, so that the side attachment frame 13 clamps the intermediate support frame 12 from both the left and right sides, thereby further improving the structural strength and stability of the intermediate support frame 12, and further improving the attachment strength and stability of the boom body 6 and the lift push rod 14 to the intermediate support frame 12.

The running chassis a adopts the specific implementation mode in the first embodiment in the specification.

The lift arm assembly b adopts the specific implementation mode in the second embodiment in the specification.

Straight arm type aerial work platform convenient to transportation is large-scale aerial work equipment, the length of big arm body 6 is very long in the lifting arm assembly b, in addition little arm body 7's length, just make the length and the height of straight arm type aerial work platform whole car very big, it is very big to go its width after chassis a expands the bridge, when using transport carrier commonly used like freight transportation cabinet, flatbed etc. to transport it, need straight arm type aerial work platform at length, the width all withdraws the shortest state with highly, make self can satisfy at transport carrier, especially the loading requirement in the freight transportation cabinet, the transportation of being convenient for, and transportation cost is reduced. Specifically, the lifting arm assembly b is integrally retracted to the state shown in fig. 1, and the traveling chassis a is integrally retracted to the state shown in fig. 1, so that the total length, the total width and the total height of the straight arm type aerial work platform convenient to transport can meet the container loading requirements of the freight container. Further, if the straight-arm type aerial work platform convenient to transport cannot meet the loading requirement of the freight cabinet after adjustment, tires in the running chassis a are replaced by special tires only used for loading and transporting, such as iron tires, the axial thickness and the radial width of the tires are smaller than those of original tires, and the width and the height of the straight-arm type aerial work platform convenient to transport are reduced by reducing the size of the tires, so that the straight-arm type aerial work platform convenient to transport can meet the loading requirement. The special tires are only used when being assembled in a cabinet, and after the straight arm type aerial work platform is conveyed to a destination, the special tires need to be replaced by original tires for actual use.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A lifting arm assembly is characterized by comprising a large arm body (6), a small arm body (7) and a variable-amplitude connecting device (8), wherein the lifting end of the large arm body (6) is rotatably connected with the fulcrum end of the small arm body (7); become width of cloth connecting device (8) and include first telescopic push rod (81) and first transfer line (82), first telescopic push rod (81) rear end rotates to be connected on the big arm body (6) and the front end rotates to be connected first transfer line (82) rear end, first transfer line (82) are located big arm body (6) with between the forearm body (7) and the front end rotates to be connected the fulcrum of forearm body (7) is served, the concertina movement of first telescopic push rod (81) can be through driving the holistic diversion of first transfer line (82) and displacement promote forearm body (7) for big arm body (6) swing.

2. A lift arm assembly in accordance with claim 1 wherein the luffing attachment (8) further comprises a guide member that is rotationally coupled to the first drive rod (82) and that limits the displacement path of the first drive rod (82).

3. A lift arm assembly according to claim 2 wherein said guide means is a first guide rocker (83), said first guide rocker (83) being pivotally connected at its upper end to the lift end of said boom body (6) and pivotally connected at its lower end to the middle of said first transfer link (82).

4. A lift arm assembly according to claim 3 wherein the pivotal connection of the first leading rocker (83) to the first transfer lever (82) is spaced from the rear end of the first transfer lever (82) by a distance less than the front end of the first transfer lever (82).

5. A lift arm assembly according to claim 3 wherein the lift end of the boom body (6) has a hollow first chamber (91) therein, the first telescopic ram (81) being located within the first chamber (91) and being extendable.

6. A lift arm assembly according to claim 5 wherein the lift end of the upper arm body (6) has an upper arm head assembly for pivotally connecting the first guide rocker (83), the fulcrum end of the lower arm body has a lower arm head assembly (71) for pivotally connecting the front end of the first transmission rod (82), and the upper arm body (6) and the lower arm body (7) are pivotally connected through the upper arm head assembly (61) and the lower arm head assembly (71); a hollow second cavity (92) is formed in the large arm head assembly (61), a hollow third cavity (93) is formed in the small arm head assembly (71), the second cavity (92) is communicated with the first cavity (91), and the third cavity (93) is communicated with the second cavity (92); the first cavity (91), the second cavity (92) and the third cavity (93) provide a movable space for the amplitude variation connecting device (8).

7. A lift arm assembly according to claim 6 wherein the upper arm body (6) is directed in its direction of extension towards the upper arm head assembly (61), the first cavity (91) being directed in the direction of extension of the upper arm body (6) and communicating with the second cavity (92); the small arm head assembly (71) extends out of one side of the small arm body (7) and is positioned between the small arm body (7) and the large arm body (6).

8. A lift arm assembly according to claim 7, further comprising a work platform (10), leveling attachment means (11) and a platform head assembly (101), said work platform (10) being mounted on said platform head assembly (101), said platform head assembly (101) being pivotally attached to said swing end of said forearm body (7); leveling connecting device (11) include second telescopic push rod (111), second transfer line (112) and second direction pendulum rod (113), second telescopic push rod (111) rear end rotates to be connected on forearm body (7) and the front end rotates to be connected the rear end of second transfer line (112), second transfer line (112) front end rotates to be connected on platform head subassembly (101), second direction pendulum rod (113) rear end rotates to be connected on forearm body (7) and the front end rotates to be connected the middle part of second transfer line (112), second telescopic push rod (111) can be through driving the holistic diversion of second transfer line (112) and displacement promote platform head subassembly (101) for forearm body (7) swing.

9. The lift arm assembly of claim 8, wherein the swing end of the small arm body (7) is provided with a swing head assembly (72) for rotatably connecting the platform head assembly (101) and the second guide swing rod (113), a hollow fourth cavity (94) is formed in the swing end of the small arm body (7), the second telescopic push rod (111) is located in the fourth cavity (94) and can extend out, a fifth cavity (95) is formed in the swing head assembly (72), a sixth cavity (96) is formed in the platform head assembly (101), and the fourth cavity (94), the fifth cavity (95) and the sixth cavity (96) provide a movable space for the leveling connecting device (11).

10. A transportable, straight arm aerial work platform comprising a lift arm assembly as claimed in any one of claims 1 to 9.

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