CN212447461U

CN212447461U - Work vehicle support device and work vehicle

Info

Publication number: CN212447461U
Application number: CN202020840122.2U
Authority: CN
Inventors: 谢世惠
Original assignee: Sany Automobile Manufacturing Co Ltd
Current assignee: Sany Automobile Manufacturing Co Ltd
Priority date: 2020-05-19
Filing date: 2020-05-19
Publication date: 2021-02-02
Anticipated expiration: 2030-05-19

Abstract

The utility model provides a support arrangement and work vehicle of work vehicle. The support device for a work vehicle includes: the supporting arm comprises a fixed supporting arm and a movable supporting arm arranged in the fixed supporting arm in a sliding manner; the electric drive assembly comprises a power assembly and a transmission assembly, the power assembly is fixed on the fixed support arm, the transmission assembly is arranged on the movable support arm, and the power assembly is matched with the transmission assembly and is suitable for driving the movable support arm to extend or contract relative to the fixed support arm. The utility model discloses strutting arrangement's volume and weight can be effectively reduced to improve strutting arrangement's flexible degree of work and response sensitivity degree from this.

Description

Work vehicle support device and work vehicle

Technical Field

The utility model relates to a technical field of work vehicle particularly, relates to work vehicle's strutting arrangement and work vehicle.

Background

Work vehicles such as concrete pump trucks, fire trucks, cranes, etc. are provided with support means, such as outriggers, which can be extended from above the work vehicle and support the work vehicle above the ground.

One of the disadvantages of the related art is that the supporting device is slow in response, resulting in a low degree of operational flexibility and response speed.

SUMMERY OF THE UTILITY MODEL

The present invention aims to solve at least one of the above technical problems.

Therefore, a first object of the present invention is to provide a support device for a work vehicle.

A second object of the present invention is to provide a working vehicle.

For realizing the utility model discloses a first purpose, the embodiment of the utility model provides an operation vehicle's strutting arrangement is provided, include: the supporting arm comprises a fixed supporting arm and a movable supporting arm arranged in the fixed supporting arm in a sliding manner; the electric drive assembly comprises a power assembly and a transmission assembly, the power assembly is fixed on the fixed support arm, the transmission assembly is arranged on the movable support arm, and the power assembly is matched with the transmission assembly and is suitable for driving the movable support arm to extend or contract relative to the fixed support arm.

The oil cylinder in the related art is replaced by the electric driving assembly, and the electric driving assembly is used for accurately and sensitively controlling the supporting arm under the driving of the electric driving assembly. The driving action of the oil cylinder is delayed, and the response is slow. Besides, the contraction and extension of the oil cylinder need to be supported by a large amount of hydraulic oil, and the oil return amount is large, so that the oil cylinder in the related technology needs to be matched with an oil storage tank with a large volume. The oil cylinder is made of a plurality of components with large volumes and complex structures, such as an oil storage tank, an oil return device, hydraulic oil, an oil pump, a multi-way valve, a balance valve, a sealing element, a hydraulic oil filter element and the like, so that the oil cylinder is complex in overall structure, large in volume and high in weight, the failure rate of the oil cylinder is high, and the maintenance and replacement costs are high. In contrast, the electric driving assembly of the embodiment is not only sensitive in response and accurate in stroke, but also does not need a complex oil return route and structure, and is small in size, simple in structure, light in weight and low in production and maintenance cost. Therefore, the present embodiment can improve the low degree of flexibility and response sensitivity of the work vehicle support device, and save production and maintenance costs. In particular, the support arm of the present embodiment includes a fixed support arm and a movable support arm. Wherein, the electric drive assembly that matches with the activity support arm drives the activity support arm and stretches out or shrink for fixed support arm, and the activity support arm is through stretching gradually with following the vehicle body of keeping away from in the transverse direction to through contracting gradually with following the vehicle body of being close to in the transverse direction. For the supporting device with the telescopic arm structure, the total length of the supporting arm is longer, the gravity center of the supporting arm is gradually far away from the vehicle body along with the gradual increase of the telescopic length of the movable supporting arm, and the force arm of the supporting arm is gradually increased. The technical solution of driving the support arm with the oil cylinder becomes increasingly unreliable. First, the more slender the cylinder is, the greater its falling force is, the poorer the stability is. Secondly, when driving and controlling a longer or more sections of telescopic boom, more hydraulic oil supply and more complicated oil inlet and return routes are required, thereby further increasing the total volume and the complexity of the components of the oil cylinder. Therefore, the embodiment adopts the electric drive assembly to control the stroke of the movable supporting arm so as to increase the flexibility, stability and reliability of the movable supporting arm in the telescopic process and reduce the volume of the supporting device.

In addition, the technical solution provided by the above embodiment of the present invention can also have the following additional technical features:

in the above technical solution, the power assembly includes: the motor is fixedly arranged on the fixed supporting arm; the gear or the chain wheel is connected to the output shaft of the motor; wherein, the fixed supporting arm is provided with a notch, and the gear or the chain wheel extends into the fixed supporting arm through the notch and is matched with the transmission component.

The rotary motion of the power assembly is converted into linear motion through the transmission assembly, and therefore the transmission assembly pushes or drives the movable supporting arm to move. The structure that above-mentioned motor and gear mutually supported is easily controlled, and its control accuracy and control sensitivity are high, and the reaction is rapid, and the flexible degree of work that can further improve the strutting arrangement of work vehicle is low and the sensitive degree of response.

In any of the above technical solutions, the transmission assembly includes at least one of the following or a combination thereof: rack drive assembly, chain drive assembly.

The rack transmission assembly in the embodiment has the advantages of simple structure and stable performance, and can ensure stable output of the torque of the power assembly. The chain transmission assembly has higher transmission efficiency, and is very convenient to install, assemble, maintain and replace.

In any of the above technical solutions, the power assembly includes: the gear extends into the fixed supporting arm from a notch on the side surface of the fixed supporting arm; the transmission assembly includes: and the rack is arranged on the movable supporting arm along the horizontal direction and is meshed with the gear. The transmission assembly includes: a gear; the rack is arranged on the movable supporting arm and is meshed with the gear; wherein, power component includes the motor, and on the fixed support arm was located to the motor, the gear sleeve was located on the motor output shaft of motor.

Because the motor is arranged on the fixed supporting arm, and the rack is arranged on the movable supporting arm, the movable supporting arm of the embodiment can be stably moved along the linear direction under the driving of the motor.

In any of the above technical solutions, the movable support arm includes: a top wall; a bottom wall disposed opposite the top wall; the side walls, the number of which is two, are arranged between the top wall and the bottom wall in pairs; wherein, the rack is fixedly arranged on at least one of the top wall, the bottom wall and the side wall.

The present embodiment cuts the splines directly onto at least one of the top, bottom and side walls, such as by laser blanking. The structure can further simplify the component structure of the supporting device, is more convenient to maintain and simplifies the process of installation and assembly.

In any of the above technical solutions, the motor is fixed above or below the fixed support arm, and the rack is formed on the top wall or the bottom wall by cutting.

This implementation makes the motor can drive the stable walking of rack to stability when guaranteeing the strutting arrangement activity.

In any of the above technical solutions, the power assembly further includes: and the speed reducer is arranged between the motor and the gear or between the motor and the chain wheel.

The speed reducer is used for adjusting the rotating speed of the power assembly so as to improve the output torque of the power assembly. Therefore, the speed reducer of the embodiment is matched with the power assembly and the transmission assembly to ensure the stability and the sensitivity of the electric driving assembly.

Among any one of the above-mentioned technical scheme, the activity support arm including first activity support arm and second activity support arm, first activity support arm sets up in fixed support arm, second activity support arm sets up in first activity support arm, the electric drive subassembly includes first electric drive subassembly and second electric drive subassembly, the power component of first electric drive subassembly is fixed in on the fixed support arm, the transmission assembly of first electric drive subassembly sets up on first activity support arm, the power component of second electric drive subassembly is fixed in on first activity support arm, the transmission assembly of second electric drive subassembly sets up on second activity support arm.

The number of the movable supporting arms of the embodiment can be two or more, wherein any movable supporting arm is respectively provided with an electric driving assembly corresponding to and matched with the movable supporting arm. The electric drive assembly drives the corresponding movable supporting arm to generate corresponding action so that the supporting device realizes the supporting function.

For realizing the utility model discloses a second purpose, the embodiment of the utility model provides an operating vehicle, include: a vehicle body; the utility model discloses strutting arrangement of any embodiment is located on the vehicle body, is suitable for the vehicle body.

The utility model discloses the working vehicle includes the utility model discloses the strutting arrangement of arbitrary embodiment, therefore it has the utility model discloses the strutting arrangement's of arbitrary embodiment whole beneficial effect, no longer give unnecessary details here.

In the above-described aspect, the work vehicle includes any one of: concrete pump truck, fire truck or crane.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a support device for a work vehicle in the related art;

fig. 2 is a first schematic structural view of a support arm according to some embodiments of the present invention in a front view;

fig. 3 is a second structural schematic view of a support arm of some embodiments of the present invention in a front view direction;

fig. 4 is a schematic top view of a support arm according to some embodiments of the present invention;

fig. 5 is a schematic diagram of a system configuration of a work vehicle according to some embodiments of the present invention.

Wherein, the corresponding relation between the reference numbers and the part names in fig. 1 is:

310': support arm, 320': support leg, 330': and an oil cylinder.

The correspondence between the reference numerals and the names of the components in fig. 2 to 5 is:

100: work vehicle, 200: vehicle body, 300: supporting means, 310: support arm, 312: fixed support arm, 314: movable support arm, 320: support leg, 330: electric drive assembly, 332: motor, 334: gear, 336: a rack.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A work vehicle supporting apparatus 300 and a work vehicle 100 of some embodiments of the present invention are described below with reference to fig. 1 to 5.

A work vehicle such as a concrete pump truck, a fire truck, or a crane needs to be supported by a support device such as a leg in order to ensure stability and safety of the work vehicle during work.

The support device is typically provided on the body of the work vehicle, which in use extends out of the body of the work vehicle and supports the work vehicle above the ground. For example, as shown in fig. 1, the support device may include a support arm 310 ' and a support leg 320 ' disposed at the bottom of the support arm 310 '. In use, the cylinder 330 'engaged with the support arm 310' drives the support arm 310 'to extend out of the body of the work vehicle, and the cylinder 330' engaged with the support leg 320 'drives the support leg 320' to extend downward, so that the body of the work vehicle is stably supported above the ground.

However, as shown in fig. 1, the supporting device of the work vehicle in the related art is generally driven by the oil cylinder 330 ', and the driving of the oil cylinder 330' results in a large volume and a high weight of the supporting device. In particular, the support device of the work vehicle in the related art has a low degree of operational flexibility and a low degree of response sensitivity.

In view of the above, the present invention provides the following embodiments in order to improve the flexibility of operation of the support device of the work vehicle and the sensitivity of the response.

Example 1:

as shown in fig. 2, the present embodiment provides a support device 300 of a work vehicle 100, including: a support arm 310 and an electric drive assembly 330, the support arm 310 including a fixed support arm 312 and a movable support arm 314 slidably disposed within the fixed support arm 312. The electric driving assembly 330 includes a power assembly fixed to the fixed support arm 312 and a transmission assembly disposed on the movable support arm 314, and the power assembly is adapted to drive the movable support arm 314 to extend or retract relative to the fixed support arm 312.

The support device 300 of the present embodiment is adapted to support the work vehicle 100 to ensure stability and safety of the work vehicle 100 in operation. In order to achieve the above-described effects, the supporting device 300 of the present embodiment includes a supporting arm 310 and a supporting leg 320. The work vehicle 100 includes a vehicle body 200, and a support arm 310 is provided on the vehicle body 200, connected to the vehicle body 200, and extends outward in a lateral direction from above the vehicle body 200 by an extending motion or a swinging motion in an operating state. The support leg 320 is provided at a lower position of the support arm 310. When the support arm 310 is extended, the support leg 320 is disposed in the longitudinal direction so that the vehicle body 200 can be stably supported above the ground.

The support arm 310 has an elongated column-like or rod-like structure, and the number thereof may be plural. For example, four support arms 310 are distributed around the vehicle body 200 in the transverse direction, and support legs 320 are respectively provided on each support arm 310. The support leg 320 has a structure in a cylindrical or circular truncated cone shape, which abuts against the ground in an operating state and exerts a vertically downward acting force to the ground to support the vehicle body 200.

The present embodiment replaces the oil cylinder 330' in the related art with the electric driving assembly 330, and the electric driving assembly 330 performs precise and sensitive control on the support arm 310 under electric driving. The driving motion of the cylinder 330' is delayed and the response is slow. Moreover, the contraction and extension of the oil cylinder 330 'require a large amount of hydraulic oil for support, and the large amount of oil return causes the oil cylinder 330' in the related art to be adapted with a large-sized oil storage tank. The oil storage tank, the oil return device, the hydraulic oil, the oil pump, the multi-way valve, the balance valve, the sealing element, the hydraulic oil filter element and other parts with large volumes and complex structures enable the oil cylinder 330 'to have complex and large overall structure and high weight, and the oil cylinder 330' has high failure rate and high maintenance and replacement cost. In contrast, the electric driving assembly 330 of the present embodiment is not only sensitive in response, precise in stroke, and does not require a complicated oil return route and structure, but also is small in size, simple in structure, light in weight, and low in production and maintenance costs. Therefore, the present embodiment can improve the low degree of flexibility and response sensitivity of the work of the support device 300 of the work vehicle 100, and save production and maintenance costs.

In particular, the support arm 310 of the present embodiment includes a fixed support arm 312 and a movable support arm 314. Wherein the electric driving assembly 330 fitted with the movable support arm 314 drives the movable support arm 314 to extend or retract relative to the fixed support arm 312, the movable support arm 314 being gradually extended to be distant from the vehicle body 200 in the lateral direction and gradually contracted to be close to the vehicle body 200 in the lateral direction. For the supporting device 300 with a telescopic arm structure, the total length of the supporting arm 310 is longer, and as the telescopic length of the movable supporting arm 314 is gradually increased, the gravity center of the supporting arm 310 is gradually far away from the vehicle body 200, and the moment arm thereof is gradually increased. The solution of using the cylinder 330' to drive the support arm 310 becomes increasingly unreliable. First, the longer and the thinner the cylinder 330', the greater the falling force, and the poorer the stability. Second, when longer or more sections of the telescopic boom are to be drive controlled, more hydraulic oil supply and more complicated oil inlet and return routes are required, thereby further increasing the overall volume and component complexity of the cylinder 330'. Therefore, the present embodiment employs the electric driving assembly 330 to control the stroke of the movable supporting arm 314, so as to increase the stability and reliability of the movable supporting arm 314 during the extension and retraction process and reduce the volume of the supporting device 300.

Example 2:

the present embodiment provides a support device 300 of a work vehicle 100, and in addition to the technical features of embodiment 1 described above, further includes the following technical features.

The power assembly includes: the motor 332 and gear 334, or power assembly, includes: a motor 332 and a sprocket. The motor 332 is fixedly disposed on the fixed support arm 312. A gear 334 or sprocket is connected to the output shaft of the motor 332. Wherein, the fixed support arm 312 is provided with a notch, and the gear 334 or the chain wheel extends into the fixed support arm 312 through the notch and is matched with the transmission component.

In this embodiment, the rotational motion of the power assembly is converted into a linear motion via the transmission assembly, so that the transmission assembly pushes or drives the movable supporting arm 314 to move. The structure of the motor 332 and the gear 334 is easy to control, the control accuracy and the control sensitivity are high, the response is rapid, and the flexibility and the response sensitivity of the operation of the support device 300 of the work vehicle 100 can be further improved.

Example 3:

the present embodiment provides a support device 300 of a work vehicle 100, and in addition to the technical features of any of the above embodiments, further includes the following technical features.

The transmission assembly comprises at least one of the following or a combination thereof: rack drive assembly, chain drive assembly.

Example 4:

as shown in fig. 3 and 4, the present embodiment provides a support device 300 of a work vehicle 100, and in addition to the technical features of any of the above embodiments, further includes the following technical features.

The power assembly includes: and the gear 334 extends into the fixed supporting arm 312 from a notch on the side surface of the fixed supporting arm 312. The transmission assembly includes: the rack 336 is horizontally disposed on the movable support arm 314 and engaged with the gear 334.

In other words, the present embodiment employs a rack and pinion gear assembly as the transmission assembly. Wherein, the rack 336 is disposed on the movable supporting arm 314 and extends longitudinally along the extending or contracting direction of the movable supporting arm 314. The motor 332 includes a motor output shaft, and the gear 334 is disposed on the outer periphery of the motor output shaft and rotates along with the motor output shaft. Since the gear 334 and the rack 336 are engaged with each other, the rack 336 can be driven to move in a linear direction by the rotating gear 334 when the motor 332 is in an operating state. Since the motor 332 is disposed on the fixed support arm 312 and the rack gear 336 is disposed on the movable support arm 314, the movable support arm 314 of the present embodiment can be stably moved in a linear direction by the driving of the motor 332.

Example 5:

The movable support arm 314 includes: top, bottom and side walls. The bottom wall is arranged opposite to the top wall. A number of two side walls are arranged in pairs between the top and bottom walls. Wherein the rack 336 is fixedly disposed on at least one of the top wall, the bottom wall and the side wall.

In this embodiment, the outer wall has an elongated tubular configuration defined by a top wall, a bottom wall, and side walls collectively. In the present embodiment, the rack is directly cut on at least one of the top wall, the bottom wall and the side wall by laser blanking cutting. The above structure can further simplify the component structure of the supporting device 300, make it more convenient for maintenance, and simplify the process of installation and assembly.

Example 6:

The motor 332 is fixed above or below the fixed support arm 312, and the rack gear 336 is formed on the top or bottom wall by cutting.

Example 7:

The power assembly further includes: and the speed reducer is arranged between the motor 332 and the gear 334 or between the motor 332 and the chain wheel.

The speed reducer is used for adjusting the rotating speed of the power assembly so as to improve the output torque of the power assembly. Thus, the speed reducer of the present embodiment cooperates with the power assembly and the transmission assembly to ensure stability and sensitivity of the electric drive assembly 330.

Example 8:

The movable support arm 314 comprises a first movable support arm and a second movable support arm, the first movable support arm is arranged in the fixed support arm 312, the second movable support arm is arranged in the first movable support arm, the electric drive assembly 330 comprises a first electric drive assembly and a second electric drive assembly, the power assembly of the first electric drive assembly is fixed on the fixed support arm 312, the transmission assembly of the first electric drive assembly is arranged on the first movable support arm, the power assembly of the second electric drive assembly is fixed on the first movable support arm, and the transmission assembly of the second electric drive assembly is arranged on the second movable support arm.

In other words, the number of the movable supporting arms 314 of the present embodiment may be two or more, wherein any one of the movable supporting arms 314 has the corresponding and adapted electric driving assembly 330. The electric driving component 330 drives the corresponding movable supporting arm 314 to perform corresponding actions, so that the supporting device 300 realizes the supporting function.

Example 9:

as shown in fig. 5, the present embodiment provides a work vehicle 100 including: the vehicle body 200 and the supporting device 300 according to any embodiment of the present invention are disposed on the vehicle body 200 and adapted to support the vehicle body 200.

The work vehicle includes any one of: concrete pump truck, fire truck or crane.

For example, the working vehicle includes a concrete pump truck provided with a stirring device and a conveying device, which can mix and stir fluid or powdery building materials such as concrete and convey the building materials. Work vehicle 100 is being supported through support device 300 like any embodiment of the present invention to guarantee work vehicle's stability and security performance.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The present embodiment provides a support device 300 and a work vehicle 100 having the support device 300.

The supporting legs of the operation vehicle in the related art adopt an oil cylinder driving structure when being stretched and unfolded. The oil cylinder driving structure has the following disadvantages: the oil cylinder driving action is delayed and the response is slow; the oil return amount is large due to the expansion of the oil cylinder, and a large oil tank is needed for storing large oil, so that the weight of the oil tank and the oil and the replacement cost of the oil, the sealing element and the filter element are increased; the oil cylinder is matched with oil pumps, multi-way valves, balance valves and other hydraulic components, and the oil cylinder has the advantages of precise structure, high purchasing and maintenance cost, high failure rate and heavy weight.

To address at least one of the above disadvantages, the supporting device 300 of the present embodiment includes a supporting arm 310 and a supporting leg 320. Among other things, support arm 310 includes a fixed support arm 312 and a movable support arm 314. The electric drive assembly 330 powers the movable support arm 314 to cause the movable support arm 314 to extend or retract relative to the fixed support arm 312.

Specifically, the electric drive assembly 330 of the present embodiment includes a power assembly and a transmission assembly. The power component of the present embodiment is embodied as a motor 332. The transmission assembly specifically includes a gear 334 and a rack 336. The motor 332 is disposed on the fixed support arm 312, and the gear 334 is sleeved on the motor output shaft of the motor 332. The rack 336 is disposed on the movable support arm 314 and is engaged with the gear 334. Thus, when the motor 332 rotates in the forward direction, the rotating gear 334 drives the rack 336 to move in a linear direction. Since the motor 332 is disposed on the fixed support arm 312 and the rack gear 336 is disposed on the movable support arm 314, the movable support arm 314 of the present embodiment can stably extend out of the fixed support arm 312 in a linear direction under the driving of the motor 332. Similarly, when the motor 332 rotates reversely, the movable support arm 314 of the present embodiment can stably retract the fixed support arm 312 in a linear direction under the driving of the motor 332. In some embodiments of the present embodiment, the structure of the gear 334 and the rack 336 cooperating with each other may be a pin-tooth structure. Further, in some embodiments of the present embodiment, the structure in which the gear 334 and the rack 336 are engaged with each other may be replaced with a structure in which a sprocket and a chain are engaged with each other.

To sum up, the utility model discloses beneficial effect does:

1. the present embodiment replaces the oil cylinder 330' in the related art with the electric driving assembly 330, and the electric driving assembly 330 performs precise and sensitive control on the support arm 310 under electric driving.

2. The electric driving assembly 330 of the present embodiment converts the revolution of the motor into a linear motion and thus pushes the support arm 310 to move. The electric driving assembly 330 of the present embodiment is not only sensitive in response, precise in stroke, and does not require a complicated oil return route and structure, but also has a small volume, a simple structure, a light weight, and low production and maintenance costs. Therefore, the present embodiment can improve the low degree of flexibility and response sensitivity of the work of the support device 300 of the work vehicle 100, and save production and maintenance costs.

In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A support device for a work vehicle, comprising:

the supporting arm comprises a fixed supporting arm and a movable supporting arm arranged in the fixed supporting arm in a sliding manner;

the electric drive assembly comprises a power assembly and a transmission assembly, the power assembly is fixed on the fixed supporting arm, the transmission assembly is arranged on the movable supporting arm, the power assembly is matched with the transmission assembly and is suitable for driving the movable supporting arm to extend or retract relative to the fixed supporting arm.

2. The work vehicle support device of claim 1, wherein the power assembly comprises:

the motor is fixedly arranged on the fixed supporting arm;

the gear or the chain wheel is connected to the output shaft of the motor;

the fixed support arm is provided with a notch, and the gear or the chain wheel extends into the fixed support arm through the notch and is matched with the transmission assembly.

3. The work vehicle support arrangement of claim 2, wherein the transmission assembly comprises at least one or a combination of:

rack drive assembly, chain drive assembly.

4. The work vehicle support device of claim 2, wherein the power assembly comprises:

the gear extends into the fixed supporting arm from a notch on the side surface of the fixed supporting arm;

the transmission assembly includes:

and the rack is arranged on the movable supporting arm along the horizontal direction and is meshed with the gear.

5. The work vehicle support apparatus of claim 4, wherein the movable support arm comprises:

a top wall;

a bottom wall disposed opposite the top wall;

two side walls arranged in pairs between the top wall and the bottom wall;

wherein the rack is fixedly disposed on at least one of the top wall, the bottom wall, and the side wall.

6. The work vehicle support device according to claim 5,

the motor is fixed in the top or below of fixed support arm, the rack is formed on the roof through the cutting or on the diapire.

7. The support device of a work vehicle according to any one of claims 2 to 6, characterized in that the power assembly further comprises:

and the speed reducer is arranged between the motor and the gear or between the motor and the chain wheel.

8. The support device for a work vehicle according to any one of claims 1 to 6,

the activity support arm including first activity support arm and second activity support arm, first activity support arm set up in the fixed support arm, second activity support arm set up in the first activity support arm, the electric drive subassembly includes first electric drive subassembly and second electric drive subassembly, the power component of first electric drive subassembly is fixed in on the fixed support arm, the transmission assembly of first electric drive subassembly set up in on the first activity support arm, the power component of second electric drive subassembly is fixed in on the first activity support arm, the transmission assembly of second electric drive subassembly set up in on the second activity support arm.

9. A work vehicle, characterized by comprising:

a vehicle body;

the support device of any one of claims 1 to 8, provided on the vehicle body, adapted to support the vehicle body.

10. The work vehicle according to claim 9, characterized in that the work vehicle comprises any one of:

concrete pump truck, fire truck or crane.