CN211107405U - Multifunctional overhead working truck for railway electrification construction - Google Patents

Abstract

The utility model provides a multifunctional overhead working truck for railway electrification construction, which comprises a frame, wherein the frame comprises an underframe; the multifunctional overhead working platform for railway electrification construction is provided with a scissor type lifting platform and a mast type lifting working bucket, and can be used for safely carrying out contact network maintenance operation in all weather. The vehicle can be self-propelled in two modes, namely a railway mode and a highway mode, and the maximum flexibility of the vehicle is kept. When long-distance transportation is needed, trailer traction can be carried out, and the requirement of quick maneuverability is met. The highly flexible radio system controller controls the upper and lower lines of the vehicle, and is simple, convenient and practical. The contact net maintenance vehicle with a wide reaching range is specially used for maintaining contact net wires, carrier cables, supporting arms and cantilevers. Two people are used for overhauing contact net twine and messenger with cutting fork elevating platform, and rotatable mast type lift operation fill is used for reaching marginal zone and overhauls contact net twine annex, including support arm and cantilever etc.. In addition, the contact network can be measured.

Description

A multifunctional aerial work vehicle for railway electrification construction

technical field

The utility model relates to the field of railway construction, in particular to a multifunctional aerial work vehicle for railway electrification construction.

Background technique

Since the State Council approved the implementation of the "Medium and Long-Term Railway Network Planning" in 2004, my country's railways have achieved rapid development. By 2020, a number of major landmark projects will be completed and put into operation, and the scale of the railway network will reach 150,000 kilometers, including 30,000 kilometers of high-speed railways, covering more than 80% of large cities. By 2025, the scale of the railway network will reach about 175,000 kilometers, including about 38,000 kilometers of high-speed railways. Looking forward to 2030, we will basically realize the situation of internal and external interconnection, smooth inter-regional multi-way, high-speed rail connection of provincial capitals, rapid access to cities and counties, and basic coverage of counties. In terms of urban rail transit construction, by the end of 2016, there were 26 cities operating rail transit in my country, with a total operating mileage of 3,748.67 kilometers.

At present, the maintenance of railway catenary mainly relies on traditional manpower carts, which have poor safety, mobility, and low operation efficiency. Obviously, it cannot meet the needs of high-speed railway construction.

Utility model content

The purpose of the utility model is to provide a multi-functional aerial work vehicle for railway electrification construction in view of the above-mentioned shortcomings of the prior art, which can be self-propelled in two modes of railway and road, and shorten the construction period of railway catenary construction and operation and maintenance.

To achieve the above object, the utility model adopts the following technical solutions:

The utility model provides a multifunctional aerial work vehicle for railway electrification construction, which comprises a vehicle frame, and the vehicle frame comprises a bottom frame;

The underframe includes a first longitudinal beam and a first transverse beam, both of the first longitudinal beam and the first transverse beam, the two first longitudinal beams are arranged at intervals, and the two first transverse beams are spaced apart And the cross is connected with the two first longitudinal beams; the two first transverse beams are both provided with supports, and both sides of the two supports are connected with second transverse beams;

The middle part of the bottom frame is provided with a traction wheel, the front part and the rear part of the bottom frame are provided with track wheels, the front end and the rear end of the bottom frame are provided with brackets, and the brackets are provided with running wheels;

The traction wheel is connected with one end of the first hydraulic cylinder through the axle hinge, and the other end of the first hydraulic cylinder is connected with the first hinge on the second beam, and the first hydraulic cylinder is in the electromagnetic ball valve. The lifting and lowering of the traction wheel is realized under control;

The middle part of the bracket is provided with a support plate, the support plate is connected with one end of the second hydraulic cylinder, the other end of the second hydraulic cylinder is connected with the support arm of the running wheel, the second hydraulic cylinder The lifting and lowering of the running wheel is realized under the control of the electromagnetic ball valve.

Further, the two supports are provided with rotating fulcrums, and the two rotating fulcrums are respectively movably connected with both ends of the base, and both ends of the base and the support on the same side are provided with second A hinge, both sides of the support are provided with a third hinge, the second hinge is connected with one end of the third hydraulic cylinder, and the other end of the third hydraulic cylinder is connected with the third hinge; The third hydraulic cylinder is controlled by a gear pump, thereby realizing the leveling of the base.

Further, a scissor lift table is provided on the side away from the base frame, the scissor lift table is arranged on one side of the base, and one side of the scissor lift table is A grounded pantograph is installed, and a mast-type lifting bucket is arranged at one corner of the base;

The scissor lift table includes a lift frame, one side of the lift frame is connected with the base, and the other side of the lift frame is connected with the platform; the lift frame is driven by a scissor lift cylinder .

Further, the grounded pantograph includes a pantograph, one end of the pantograph is connected to the scissor lift platform, the other end of the pantograph is connected to one end of a spring, and the The other end is connected with the network cable contact rod; the pantograph is controlled up and down by the air compressor.

Further, the mast-type lifting bucket includes a bucket lifting device, the bucket lifting device is sequentially connected with the mast lifting device and the chassis rotation, and the chassis rotation device is installed and connected with the base; The lifting action of the bucket lifting device and the mast lifting device is controlled by an electromagnetic reversing valve, and the rotation of the chassis is controlled by an electromagnetic reversing valve to rotate left and right.

Further, each of the first longitudinal beams is provided with four fourth hinges, the two sides of each of the traction wheels are provided with a fourth hinge, and a fourth hinge is installed between each two of the fourth hinges. leaf springs, each of which is mounted above the traction wheel.

Further, one end of the bottom frame is provided with a traction head, and the traction head is connected with the tractor.

Further, the four rail wheels are directly driven by the four first wheel side hydraulic motors, the first wheel side hydraulic motors on the same side are connected in series, and the first wheel side hydraulic motors on both sides are connected in parallel; the first wheel side hydraulic motors are connected in parallel; The side hydraulic motor is controlled by a proportional multi-way valve;

The four running wheels are directly driven by the four second wheel hydraulic motors respectively, the second wheel hydraulic motors on the same side are connected in parallel, and the steering and rotational speed of the second wheel hydraulic motors on both sides are proportional to the two connections. The valves are controlled separately.

Further, an angle sensor is provided on the base, and the angle sensor measures the ultra-high inclination of the base, and transmits the signal to the vehicle controller for PID operation, and adjusts the third hydraulic cylinder through a proportional valve , so as to realize the automatic leveling of the base.

Further, the driving torque of the first wheel side hydraulic motor is: 174.4Nm, and the motor oil supply flow of the first wheel side hydraulic motor is 106.6L/min;

The driving torque of the second wheel side hydraulic motor is: 3451Nm, and the motor oil supply flow of the second wheel side hydraulic motor is 103.2L/min.

The beneficial effects of the utility model are as follows: the multifunctional aerial work platform for railway electrification construction is equipped with a scissor type lifting platform and a mast type lifting operation bucket, which can be used for all-weather (day and night) safe catenary maintenance operations. It can be self-propelled in both rail and road modes, maintaining the maximum flexibility of the vehicle. When long-distance transportation is required, trailer towing can be carried out to meet the requirements of rapid mobility. The highly flexible radio system controller controls the upper and lower lines of the vehicle, which is simple and practical. The work platform is a catenary maintenance vehicle with a wide range of work, which is specially used for the maintenance of catenary wires, load-bearing cables, support arms and cantilevers. The two-person scissor lift table is used for maintenance of catenary cables and bearing cables, and the rotatable mast-type lifting bucket is used to reach the edge area for maintenance of catenary cable accessories, including support arms and cantilevers. In addition, the catenary wire can be measured;

The whole vehicle has three working modes, which can meet the requirements of three working conditions: highway fast motor traction, upper and lower track line running, and track line operation. The traction sheave and the traveling sheave are controlled and retracted by the hydraulic cylinder, which can realize the switching of three working modes. The base has tilting automatic leveling and leveling locking functions, which can achieve the maximum leveling of the base with a super high level (1435mm gauge) of 185mm, ensuring the safety and comfort of aerial work. The base is equipped with an angle sensor, which can be adjusted to be parallel to the frame. In the traction mode and the walking mode, the automatic leveling function of the base is turned off, and the base is adjusted to be parallel to the frame through the angle sensor. The mechanical limit can fix the base to prevent the base from shaking left and right in the traction and walking mode. The mast-type lifting bucket can be rotated and lifted 0-180°, and the scissor-type lifting platform can be lifted vertically. The two are arranged on both sides above the base, with an aisle in the middle. The operator climbs the ladder from the rear of the vehicle to board the base, and enters the lifting equipment from the base aisle for operation. A grounded pantograph is installed in the middle of the rear of the car to prevent electric shocks for operators. The lift is controlled by the air compressor, and the lead height and pull-out value of the catenary cable can be measured.

The vehicle adopts Cummins QSF2.8T3NA46 (naturally aspirated) diesel engine, which drives the variable flow pump and gear pump as the hydraulic power source. The rail wheel and the running wheel are driven by the wheel side hydraulic motor. The rail wheel hydraulic motor has its own running and parking brakes, and the running wheel hydraulic motor has its own parking brake. The whole vehicle is unpowered traction, the leaf spring is suspended for shock absorption, and the traction braking adopts inertia hydraulic braking, which has stable braking and high sensitivity.

Description of drawings

1 is a schematic structural diagram of a multi-functional aerial work vehicle for railway electrification construction of the present utility model;

Fig. 2 is the structural representation of the frame;

Figure 3 is a schematic diagram of the structure of the base leveling force analysis;

Figure 4 is a schematic diagram of the structure of the grounded pantograph;

Figure 5 is a schematic diagram of the principle of the running pump source part;

Fig. 6 is the principle schematic diagram of the running part of the track wheel;

Fig. 7 is a schematic diagram of the running part of the running wheel;

Figure 8 Schematic diagram of the oil source principle of the working part of the base.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

As shown in FIG. 1 and FIG. 2 , a multifunctional aerial work vehicle for railway electrification construction includes a frame 1, and the frame 1 includes a bottom frame 2;

The bottom frame 2 includes a first longitudinal beam 201 and a first transverse beam 206, both of the first longitudinal beam 201 and the first transverse beam 206, the two first longitudinal beams 201 are arranged at intervals, and the two The first cross beams 206 are connected to the two first longitudinal beams 201 at intervals and spanning; the two first cross beams 206 are provided with supports 207 on both sides of the two supports 207 are connected with a second beam 208;

The middle part of the bottom frame 2 is provided with a traction wheel 202 , the front part and the rear part of the bottom frame 2 are provided with track wheels 203 , and the front end and the rear end of the bottom frame 2 are provided with brackets 205 . There are walking wheels 209;

The traction sheave 202 is connected to one end of the first hydraulic cylinder 501 through an axle hinge, and the other end of the first hydraulic cylinder 501 is connected to the first hinge 301 on the second beam 208 . The cylinder 501 realizes the lifting and lowering of the traction wheel 202 under the control of the electromagnetic ball valve;

A support plate 2010 is provided in the middle of the bracket 205 , the support plate 2010 is connected with one end of the second hydraulic cylinder 502 , and the other end of the second hydraulic cylinder 502 is connected with the support arm 2011 of the traveling wheel 209 , the second hydraulic cylinder 502 realizes the lifting and lowering of the running wheel 209 under the control of the electromagnetic ball valve.

The two supports 207 are provided with rotating fulcrums 2012, and the two rotating supports 2012 are respectively movably connected to both ends of the base 6, and both ends of the base 6 and the support 207 are on the same side. A second hinge 302 is provided, both sides of the support 207 are provided with a third hinge 303, the second hinge 302 is connected with one end of the third hydraulic cylinder 503, and the other end of the third hydraulic cylinder 503 Connected with the third hinge 303 ; the third hydraulic cylinder 503 is controlled by a gear pump, so as to achieve the leveling of the base 6 .

The side of the base 6 away from the bottom frame 2 is provided with a scissor lift table 7, and the scissor lift table 7 is arranged on one side of the base 6. The scissor lift table A grounded pantograph 8 is installed on one side of 7, and a mast-type lifting bucket 9 is arranged at one corner of the base 6;

The scissor lift table 7 includes a lift frame 701, one side of the lift frame 701 is connected to the base 6, and the other side of the lift frame 701 is connected to a platform 702; the lift frame The 701 is driven by a scissor lift cylinder.

As shown in FIG. 4 , the grounded pantograph 8 includes a pantograph 801 , one end of the pantograph 801 is connected to the scissor lift platform 7 , and the other end of the pantograph 801 is connected to a spring One end of the spring 803 is connected, and the other end of the spring 803 is connected with the network cable contact rod 802; the pantograph 801 is controlled up and down by an air compressor.

Among them, a grounded pantograph is installed in the middle of the rear of the car, which can measure the conductance and pull-out value of the catenary cable. The pantograph is controlled by the air compressor to lift, and the lifting height from the track surface meets the requirements of the catenary operation (4.1m ~ 6.5m). The top section of the pantograph has a spring, which ensures that the pantograph is always in contact with the catenary wire when the height fluctuates.

The mast-type lifting bucket 9 includes a bucket lifting device 901, which is sequentially connected to a mast lifting device 902 and a chassis swivel 903, and the chassis swivel device 903 is connected to the base 6 Installation is connected; the bucket lifting device 901 and the mast lifting device 902 are controlled by the electromagnetic reversing valve to control the lifting action, and the rotation of the chassis is controlled by the electromagnetic reversing valve to control the left and right rotation.

Each of the first longitudinal beams 201 is provided with four fourth hinges 304 , each of the traction wheels 202 is provided with one of the fourth hinges 304 on both sides, and each of the two fourth hinges 304 is A leaf spring 2013 is installed between the two, and each leaf spring 2013 is installed above the traction wheel 202 .

One end of the chassis 2 is provided with a traction head 308, and the traction head 308 is connected to the tractor.

Among them, the working principle of the inertial hydraulic braking system is to use the thrust generated by the braking of the tractor to drive the brake main pump of the hydraulic braking system through the inertial power take-off device, so that the brake fluid in the main pump enters the brake system under a certain pressure. The dynamic wheel cylinder generates pressure through the wheel cylinder to push the brake shoes to open, and presses the inner circular surface of the brake drum with its friction plate to realize braking. The structure principle of the parking brake is based on the parking brake operating mechanism. The input of braking force, the hydraulic principle is consistent with inertia braking. The principle of emergency braking is to connect with the tractor through the insurance wire rope. When the decoupling occurs, the main vehicle drives the insurance wire rope to form the input of braking force. The hydraulic principle is consistent with the inertia braking.

The three brakes are all driven by the adjusting arm bracket to pull the link mechanism to drive the hydraulic device to achieve hydraulic braking. The three braking methods are unified and relatively independent.

When the tractor is reversing (low speed), because the spring designed on the inertial power take-off device has a certain initial pressure, the reversing force at this time is much smaller than the braking force of the trailer inertia acting on the inertial power take-off device when the tractor is braking, so as to achieve smooth operation. Back up.

The four rail wheels 203 are directly driven by four first wheel side hydraulic motors, the first wheel side hydraulic motors on the same side are connected in series, and the first wheel side hydraulic motors on both sides are connected in parallel; the first wheel side hydraulic motors are connected in parallel; The hydraulic motor is controlled by a proportional multi-way valve;

The four running wheels 209 are directly driven by the four second wheel hydraulic motors respectively, the second wheel hydraulic motors on the same side are connected in parallel, and the steering and rotational speed of the second wheel hydraulic motors on both sides are proportional to the two The multi-way valves are controlled separately.

As shown in Figures 5 to 7, the main pump B02 is an open load-sensitive pump. By adjusting the opening of the main spool, the corresponding flow is provided to the running system. The pump can be automatically adjusted according to the highest pressure-flow required by the running system. The displacement of the main pump;

The travel control valve B08 is a triple electric proportional load-sensing valve, which can control multiple actuators independently and work at different speeds and pressures independently of each other. One of them is used to control the running direction and speed of the track wheel, and the other is used to control The running direction and speed of the left running wheel are used to control the running direction and speed of the right running wheel.

The manual ball valve B12 is the towing control valve of the running wheel. When the vehicle fails, open the manual ball valve in the running wheel mode to carry out towing, and the towing speed cannot exceed the running speed of the running wheel.

The electromagnetic ball valve B15 is the track wheel travel control valve. When the vehicle system is braked, the two ends of the motor are connected through the travel control valve to realize the precise position control of the vehicle sliding under the braking state. At the same time, the vehicle can be towed in a non-working state, and the towing speed cannot exceed the running speed of the track wheels.

Hydraulic motors B16 and B17 are track wheel running motors, among which the B16 hydraulic motor does not have a parking brake and a service brake, and the B17 hydraulic motor has a parking brake and a service brake. The running part of the track wheel adopts 4 wheel side motors to directly drive the 4 track wheels, and the hydraulic motor adopts the drive scheme of the hydraulic motor on the same side in series and the hydraulic motors on both sides in parallel.

Hydraulic motors B19 and B20 are traveling wheels traveling motors, among which the B19 hydraulic motor has a parking brake, and the B20 hydraulic motor does not have a parking brake. The traveling part of the traveling wheel also uses 4 wheel motors to directly drive the 4 traveling wheels. The traveling hydraulic motor is arranged in parallel with the hydraulic motors on the same side. Two proportional multi-way valves are used to control the steering and speed of the motors on both sides respectively. The multi-way valve controls the different speeds of the motors on both sides to realize the vehicle slip steering.

When the track is uneven and the four wheels do not touch the ground at the same time, at least three wheels are kept in contact with the track. Since the work platform adopts the structure of the motors on the same side in series, the speed of the front and rear motors in the series remains the same, thus ensuring the speed of the motors on both sides. It is basically the same, so in the case of using this motor arrangement, it is not necessary to consider the situation of the vehicle wheels hanging in the air.

When the vehicle is operating in the running mode of the running wheel, it will inevitably encounter the situation that the turning is restricted by the site. The multi-way valve controls the wheels on both sides to rotate in opposite directions, so as to realize the steering of different diameters and even the in-situ steering.

The base 6 is provided with an angle sensor, the angle sensor measures the ultra-high inclination of the base 6, and transmits the signal to the vehicle controller for PID operation, and adjusts the third hydraulic cylinder through a proportional valve 503, so as to realize the automatic leveling of the base 6.

As shown in Figures 3 and 8, the working part of the base platform uses a gear pump C02 to supply oil to the entire base leveling and working part. The outlet of the gear pump is connected to a 10L accumulator C07 and a discharger. Load relief valve C04, when the oil pressure of the working circuit reaches the set value, the pressure is maintained by the accumulator, and the gear pump is unloaded through the unload relief valve to reduce the power loss and heat generation of the system.

At the same time, a manual pump C11 and an electric pump C09 are connected in parallel as the emergency oil source. When the vehicle fails to provide the oil source, the electric pump can be driven by the vehicle battery or the manual pump can be manually operated to supply oil to the working circuit. Emergency lowering of the work platform and emergency release of the parking brake so that the vehicle is towable.

The driving torque of the first wheel side hydraulic motor is 174.4Nm, and the motor oil supply flow of the first wheel side hydraulic motor is 106.6L/min.

The track wheel travel motor is driven independently by four wheels, so the number of track wheel travel motors n_g is 4 sets. Because the wheel-side motor is used to directly drive the wheels, the maximum speed v_g of the vehicle track is 20Km/h, and the direct D_g of the track wheel is 0.36m, so the maximum rotation speed of the track wheel n_g is 294.8Rpm. The reference vehicle weight M is 6t, so the radial load of a single travel motor is 14.7kN. Considering the eccentric load and impact of the vehicle, the dynamic load factor is taken as 1.5, so the radial load of each wheel is 22.05kN.

The maximum driving force required by the rail wheel when running is 3.876kN, and the required driving force F_g of a single motor is 0.969kN, so the calculation of the driving torque Tm_g of a single motor is:

Tm_g=F_g*D_g/2=174.4Nm

According to the radial load of the motor and the motor torque, the motor displacement q_g of the first wheel side hydraulic motor is 172ml/r.

The total efficiency ηm of the motor is 90%, so the calculated working pressure difference ΔP_g of the motor is:

ΔP_g=20*Tm_g*π/q_g/ηm=70.8Bar

The motor volumetric efficiency ηv is 0.95, and the maximum working flow Qm_g of a single motor is calculated as:

Qm_g=q_g*n_g/1000/ηv=53.3L/min

Since the four traveling motors are arranged in series on the same side and parallel on both sides, the oil supply pressure required by the four traveling motors is P_g=2*ΔP_g+10=151.6Bar, and the oil supply flow required by the motors is Q_g=2*Qm_g =106.6L/min.

The driving torque of the second wheel side hydraulic motor is: 3451Nm, and the motor oil supply flow of the second wheel side hydraulic motor is 103.2L/min.

The traveling wheel traveling motor is independently driven by four wheels, so the number n_g of traveling wheel traveling motor is 4 sets. Since the wheel-side motor is used to directly drive the wheels, the maximum speed v_j of the vehicle track is 2.5Km/h, and the diameter D_j of the running wheel is 0.68m, so the maximum rotation speed of the running wheel n_j is 19.5Rpm. The reference vehicle weight M is 6t, so the radial load on a single travel motor is 14.7kN. Considering the eccentric load and impact of the vehicle, the dynamic load factor is taken as 1.5, so the radial load of each wheel is 22.05kN.

The maximum driving force required by the running wheels is 40.6kN, and the required driving force F_j of a single motor is 10.15kN, so the calculation of the driving torque Tm_j of a single motor is:

Tm_j=F_j*D_j/2=3451Nm

The total efficiency ηm of the motor is 90%, so the calculated working pressure difference ΔP_j of the motor is:

ΔP_j=20*Tm_j*π/q_j/ηm=191.4Bar

The motor volumetric efficiency ηv is 0.95, and the maximum working flow Qm_j of a single motor is calculated as:

Qm_j=q_j*n_j/1000/ηv=25.8L/min

Since the four traveling motors are connected in parallel on the same side, and the two sides are controlled by two multi-way valves, the oil supply pressure required by the four traveling motors is P_j=ΔP_j+10=201.4Bar, and the oil supply flow required by the motors is Q_j= 2*Qm_j=103.2L/min.

A working mode of a multifunctional aerial work vehicle for railway electrification construction is:

1) Traction mode

When long-distance transportation by road is required, the work platform can be towed by the tractor to meet the requirements of road towing. In the traction driving mode, the hydraulic cylinder acts on the axle hinge to lower the traction wheel and touch the ground, and the running wheel is in a retracted state. The traction wheel adopts leaf spring suspension to meet the shock absorption requirements of the vehicle on the road;

2) Travel mode

When the work platform reaches the designated place and needs to get on the track, switch the traction mode to the running mode. Under the action of the hydraulic cylinder, the running wheel is lowered to touch the ground, the whole vehicle is jacked up, and then the traction wheel is retracted. The four running wheels are driven by four wheel-side hydraulic motors, which can meet the requirements of horizontal up and down tracks. There is a limit hole on the travel wheel bracket, and the limit rod can be inserted. When the front running wheel crosses the second track, the rear limit rod just contacts the first track to realize the limit, so that the accurate centering of the track wheel and the track can be realized.

3) Orbit Mode

When the track wheels of the work platform are centered on the track, the traveling wheels are slowly retracted, and the whole vehicle is slowly lowered. After ensuring that the track wheels are in contact with the track, the traveling wheels are completely retracted. The four track wheels are driven by four wheel-side hydraulic motors to meet the power requirements of the track gradient of 60‰.

The above-mentioned embodiments only represent the embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the present invention. It should be pointed out that for those of ordinary skill in the art, some modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for this utility model shall be subject to the appended claims.

Claims (8)

1. The utility model provides a multi-functional high altitude construction car of railway electrification construction, includes frame (1), its characterized in that: the frame (1) comprises an underframe (2);

the underframe (2) comprises two first longitudinal beams (201) and two first cross beams (206), the two first longitudinal beams (201) and the two first cross beams (206) are arranged at intervals, and the two first cross beams (206) are connected with the two first longitudinal beams (201) at intervals and cross; two first cross beams (206) are respectively provided with a support (207), and two sides of the two supports (207) are respectively connected with a second cross beam (208);

the middle part of the chassis (2) is provided with a traction wheel (202), the front part and the rear part of the chassis (2) are provided with track wheels (203), the front end and the rear end of the chassis (2) are provided with brackets (205), and the brackets (205) are provided with walking wheels (209);

the traction wheel (202) is connected with one end of a first hydraulic cylinder (501) through a wheel axle hinge, the other end of the first hydraulic cylinder (501) is connected with a first hinge (301) on the second cross beam (208), and the first hydraulic cylinder (501) achieves lifting of the traction wheel (202) under the control of an electromagnetic ball valve;

a supporting plate (2010) is arranged in the middle of the support (205), the supporting plate (2010) is connected with one end of a second hydraulic cylinder (502), the other end of the second hydraulic cylinder (502) is connected with a supporting arm (2011) of the traveling wheel (209), and the second hydraulic cylinder (502) is controlled by an electromagnetic ball valve to realize the lifting of the traveling wheel (209);

the two supports (207) are provided with rotating fulcrums (2012), the two rotating fulcrums (2012) are respectively movably connected with two ends of a base (6), two ends of the base (6) on the same side with the supports (207) are respectively provided with a second hinge (302), two sides of the supports (207) are respectively provided with a third hinge (303), the second hinges (302) are connected with one end of a third hydraulic cylinder (503), and the other end of the third hydraulic cylinder (503) is connected with the third hinge (303); the third hydraulic cylinder (503) is controlled by a gear pump, so that the leveling of the base (6) is realized;

an angle sensor is arranged on the base (6), the angle sensor measures the ultrahigh inclination of the base (6), transmits a signal to a vehicle controller to perform PID operation, and adjusts the third hydraulic cylinder (503) through a proportional valve, so that the automatic leveling of the base (6) is realized;

a gear pump C02 is adopted by the platform operation part of the base (6) to level the whole base and supply oil to the operation part, the outlet of the gear pump is connected with a 10L energy accumulator C07 and an unloading overflow valve C04, and a manual pump C11 and an electric pump C09 are connected in parallel to serve as emergency oil sources.

2. The multifunctional overhead working truck for railway electrification construction according to claim 1, characterized in that: a scissor-type lifting platform (7) is arranged on one surface, away from the underframe (2), of the base (6), the scissor-type lifting platform (7) is arranged on one side of the base (6), a grounding pantograph (8) is arranged on one side of the scissor-type lifting platform (7), and a mast-type lifting operation bucket (9) is arranged at one corner of the base (6);

the scissor type lifting platform (7) comprises a lifting frame (701), one side of the lifting frame (701) is connected with the base (6), and the other side of the lifting frame (701) is connected with a platform frame (702); the lifting frame (701) is driven by a scissor lifting cylinder.

3. The multifunctional overhead working truck for railway electrification construction according to claim 2, characterized in that: the grounding pantograph (8) comprises a pantograph (801), one end of the pantograph (801) is connected with the scissor-type lifting platform (7), the other end of the pantograph (801) is connected with one end of a spring (803), and the other end of the spring (803) is connected with a cable contact rod (802); the pantograph (801) is controlled to ascend and descend by an air compressor.

4. The multifunctional overhead working truck for railway electrification construction according to claim 3, wherein: the mast type lifting operation bucket (9) comprises an operation bucket lifting device (901), the operation bucket lifting device (901) is sequentially connected with a mast lifting device (902) and a chassis revolving device (903), and the chassis revolving device (903) is connected with the base (6) in an installing way; the working bucket lifting device (901) and the mast lifting device (902) are controlled by an electromagnetic directional valve to lift, and the chassis rotates left and right through the electromagnetic directional valve.

5. The multifunctional overhead working truck for railway electrification construction according to claim 1, characterized in that: four fourth hinges (304) are arranged on each first longitudinal beam (201), one fourth hinge (304) is arranged on each of two sides of each traction wheel (202), a plate spring (2013) is installed between every two fourth hinges (304), and each plate spring (2013) is installed above the traction wheel (202).

6. The multifunctional overhead working truck for railway electrification construction according to claim 1, characterized in that: one end of the underframe (2) is provided with a traction head (308), and the traction head (308) is connected with a tractor.

7. The multifunctional overhead working truck for railway electrification construction according to claim 1, characterized in that: the four rail wheels (203) are directly driven by four first wheel hydraulic motors respectively, the first wheel hydraulic motors on the same side are connected in series, and the first wheel hydraulic motors on two sides are connected in parallel; the first wheel hydraulic motor is controlled by a series of proportional multi-way valves;

the four traveling wheels (209) are directly driven by four second wheel hydraulic motors respectively, the second wheel hydraulic motors on the same side are connected in parallel, and the steering and the rotating speed of the second wheel hydraulic motors on two sides are controlled by two-in-one proportional multi-way valves respectively.

8. The multifunctional overhead working truck for railway electrification construction as claimed in claim 7, wherein the driving torque of the first wheel-side hydraulic motor is 174.4Nm, and the oil supply flow rate of the motor of the first wheel-side hydraulic motor is 106.6L/min;

the driving torque of the second wheel side hydraulic motor is 3451Nm, and the oil supply flow of the motor of the second wheel side hydraulic motor is 103.2L/min.

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