CN214532753U

CN214532753U - Electric overhead line system maintenance ladder vehicle

Info

Publication number: CN214532753U
Application number: CN202022518744.6U
Authority: CN
Inventors: 张勇; 鲁子阳; 张盟; 贾英杰; 刘涵斌; 胡馨丹; 曾广胜
Original assignee: Hunan University of Technology
Current assignee: Hefei Longzhi Electromechanical Technology Co ltd
Priority date: 2020-03-31
Filing date: 2020-11-04
Publication date: 2021-10-29
Anticipated expiration: 2030-11-04

Abstract

The utility model discloses an electronic contact net overhauls ladder car, include ladder car chassis, can dismantle ladder frame and work platform and constitute, fixed mounting has drive battery group, transmission system, wheelset and prevent the tongs that topples on the ladder car chassis, can dismantle ladder frame and can divide into upper, middle and lower triplex, just junction between the triplex of dismantling ladder frame all rotates and is connected with a take-up pulley, the beneficial effects of the utility model are that: compared with the prior art, the design of the electric contact net maintenance ladder car can electrically control the running of the car ladder, greatly improves the efficiency of maintenance work of the contact net maintenance ladder car, and simultaneously saves the man-power cost for enterprises because the protection personnel of the ladder car below is not needed; through the design of the overturn-preventing device, the overturn condition of the vehicle ladder can be avoided in the running process, the safety performance of the ladder vehicle is improved, and the safety of maintenance personnel is ensured; through the detachable design of the ladder frame, the vehicle ladder is convenient to transport daily.

Description

Electric overhead line system maintenance ladder vehicle

Technical Field

The utility model belongs to the technical field of relate to electronic railway contact net maintenance ladder, specifically be an electronic contact net maintenance ladder car.

Background

Along with the rapid development of Chinese railway transportation, the mileage of electrified railways, high-speed passenger dedicated lines and the like is greatly increased, the workload of contact network maintenance is correspondingly and rapidly increased, i.e. the contact network maintenance in China faces huge challenges, and the contact network maintenance work process in daily life is required to have higher working efficiency and safety factor.

In the prior art, the following main problems exist:

firstly, 4-6 people are needed to push the ladder to walk when the manual maintenance ladder vehicle works, and the labor cost is high; the vehicle ladder structure is mainly integrally connected, the ladder frame can not be disassembled, the occupied area is large, and the transportation is difficult; the chassis and the ladder frame of the ladder car are made of steel materials generally, so that the weight is large, and the ladder car is difficult to work and transport;

the probability of left and right overturn of the manual ladder car in the moving process is higher and higher, particularly when the overhead line system is overhauled in windy weather, particularly in a bad wind environment, the ladder car which normally advances along the rail or the ladder car which is parked on the rail for overhauling can be impacted by strong transverse wind, and the risk of overturn of the ladder car is greatly increased; in addition, when a worker climbs above the working platform through the detachable ladder frame, the pedaling force of the worker on the chassis of the ladder car below is uneven, so that the working platform is easy to shake, the worker generates panic psychology, and the ladder car is likely to overturn; when the ladder car moves to the railway curve, the heights of the two sides of the rail are different, the inclination measurement of the maintenance platform is very serious, the ladder car can be overturned, the danger can be brought to workers under the condition, the working efficiency can be influenced, and huge economic loss is brought.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electronic contact net overhauls tower wagon in order to solve above-mentioned problem, it is big to have solved current artifical tower wagon weight, and difficult work and remove and meet the problem that windy weather tower wagon probably takes place to topple.

In order to solve the above problem, the utility model provides a technical scheme:

an electric contact net overhauling ladder car comprises a ladder car chassis, a detachable ladder frame and a working platform, wherein a driving battery pack, a transmission system, a wheel set and an anti-overturning hand grip are fixedly installed on the ladder car chassis, the detachable ladder frame can be divided into an upper part, a middle part and a lower part, a tensioning wheel is rotatably connected at the joint between the three parts of the detachable ladder frame, two tensioning ropes are wound on the tensioning wheels together, the two tensioning ropes are nylon fiber tows formed by a plurality of nylon fiber yarns, one end of each of the two tensioning ropes is fixedly connected with the anti-overturning hand grip, one end of each of the two tensioning ropes, which is far away from the anti-overturning hand grip, is fixedly connected with a rope reel, a rotating drum is fixedly connected on the side wall of one side, opposite to each of the two rope reels, and a bearing seat I is fixedly connected at the position between the two rope reels and the rotating drum, two bearing frame a fixed connection is on work platform's upper surface, the center department fixedly connected with of the lateral wall of rotation drum has an operating handle, operating handle's upper end pole wall offsets with work platform's top, work platform's top fixed mounting has a pawl, corresponds the pawl is located one of them rope reel and is fixed the ratchet that has cup jointed, the pawl meshes with the ratchet mutually.

Preferably, the ladder car chassis comprises two longitudinal beams, the two longitudinal beams are fixedly connected to the lower end of the detachable ladder frame, a plurality of transverse beams are fixedly connected to the side wall of one opposite side of the two longitudinal beams together, and a short longitudinal beam is fixedly connected to the two transverse beams together.

As preferred, can dismantle ladder frame includes a plurality of root ladder frames, four wherein sub ladder frame is matrix form fixed connection at two vertical roof beam upper surfaces, a plurality of sub ladder frame all with two-phase pipe expert fixed connection, a plurality of the equal fixedly connected with screw thread fastener of junction between the sub ladder frame, per two adjacent all through screw thread fastener looks joint between the sub ladder frame, per two corresponding all be an oblique pull rod of slope form fixedly connected with on the pole wall of sub ladder frame one side in opposite directions, four wherein four the fixed cover in top of sub ladder frame has four three-phase pipe expert, four the common fixed cup joint in the lower extreme of work platform in top of three-phase pipe expert.

As preferred, transmission system includes a integral key shaft, the wherein one end fixed connection of integral key shaft is at the output of drive battery group, the integral key shaft is kept away from a connecting axle of one end fixedly connected with of drive battery group, a gear commutator of one end fixedly connected with of integral key shaft is kept away from to the connecting axle, bearing frame two of gear commutator's lower fixed surface is connected with, two fixed connection of bearing frame locate at the center of one of them transverse beam upper surface, gear commutator's output is two shaft couplings of symmetry form fixedly connected with, gear commutator is two drive shafts of fixedly connected with respectively through two shaft couplings.

Preferably, the overturn-preventing gripper comprises four baffles, the four baffles are respectively and fixedly connected to the side wall of one side, far away from two longitudinal beams, of the baffle, two movable bolts are rotatably connected between the inner side walls, close to the lower end, of the baffle in the opposite direction through bearings, one copying rail-grabbing claw is fixedly sleeved on each of the two movable bolts, two fixed shaft pins are arranged on the inner side wall of the upper end of each baffle corresponding to the two copying rail-grabbing claws and are respectively clamped with the corresponding copying rail-grabbing claw, one of the two movable bolts is fixedly connected with a piston rod, the upper end of the piston rod penetrates through the upper surface of the baffle and extends upwards to the outside of the baffle and is fixedly connected to a tensioning rope, and the overturn-preventing gripper selects Q235 steel as a manufacturing material.

Preferably, the two longitudinal beams are fixedly connected with four connecting supports in a matrix manner on the side wall far away from one side, the upper surfaces of the four connecting supports are fixedly connected with a driven wheel support, one end of each of the four driven wheel supports is fixedly connected with a wheel group, and the two driven wheel supports are fixedly connected with two corresponding driving shafts respectively.

Preferably, each of the four driven wheel supports includes a fixed shaft support, the four fixed shaft supports are respectively and fixedly connected to the upper surfaces of the four connecting supports, a bearing is fixedly sleeved inside each of the four fixed shaft supports, a fixed shaft is fixedly sleeved inside each of the four bearings, one end of each of the two fixed shafts is respectively and fixedly connected to two corresponding driving shafts, the other end of each of the four fixed shafts is respectively and fixedly connected to a sleeve, one end of each of the four sleeves, which is far away from the fixed shaft, is respectively and fixedly connected to four lock nuts, and the four sleeves are respectively and fixedly mounted on corresponding wheel sets through the four lock nuts.

Preferably, the driving battery pack is fixedly arranged on the upper surface of the short longitudinal beam, the parameter of the driving battery pack is determined as a lithium battery with a model number of SDA10-4850/48V50AH, the output end of the driving battery pack is fixedly provided with a direct current brush motor, and the output end of the direct current brush motor is fixedly connected to one end, close to the direct current brush motor, of the spline shaft.

The utility model has the advantages that: compared with the prior art, the design of the electric contact net maintenance ladder car can electrically control the running of the car ladder, greatly improves the efficiency of maintenance work of the contact net maintenance ladder car, and simultaneously saves the man-power cost for enterprises because the protection personnel of the ladder car below is not needed; through the design of the overturn-preventing device, the overturn condition of the vehicle ladder can be avoided in the running process, the safety performance of the ladder vehicle is improved, and the safety of maintenance personnel is ensured; through the detachable design of the ladder frame, the vehicle ladder is convenient to transport daily.

Description of the drawings:

for ease of illustration, the invention is described in detail by the following detailed description and accompanying drawings.

Fig. 1 is a front view of an electric contact net maintenance ladder truck of the utility model;

fig. 2 is a side view of an electric contact net maintenance ladder truck of the utility model;

fig. 3 is a structural bottom view of a ladder car chassis of the electric contact net maintenance ladder car of the present invention;

fig. 4 is a structural view of an operation system of an overturn preventing device of an electric contact net maintenance ladder car of the utility model;

fig. 5 is a structural diagram of a rail grabbing system of an anti-overturning device of an electric contact net maintenance ladder truck of the utility model;

fig. 6 is a structural diagram of a detachable ladder frame of the electric contact net maintenance ladder car of the utility model;

fig. 7 is the utility model relates to an electronic contact net overhauls ladder car from the structure chart of driving wheel support.

In the figure: 1. a ladder vehicle chassis; 1.1, longitudinal beams; 1.2, short longitudinal beam; 1.3, transverse beams; 2. the ladder frame can be disassembled; 2.1, a sub-ladder frame; 2.2, a threaded fastener; 2.3, an oblique pull rod; 3. a working platform; 4. Driving the battery pack; 5. a transmission system; 5.1, spline shafts; 5.2, connecting shafts; 5.3, a gear commutator; 5.4, a driving shaft; 5.5, a first bearing seat; 5.6, a coupler; 6. a wheel set; 7. the overturn-preventing gripper; 7.1, a piston rod; 7.2, a baffle plate; 7.3, fixing the shaft pin; 7.4, a movable shaft pin; 7.5, copying rail-grabbing claws; 8. a rope reel; 9. a second bearing seat; 10. a ratchet wheel; 11. tensioning the rope; 12. an operating handle; 13. Three-phase pipe connection; 14. a tension wheel; 15. two-phase pipe communication; 16. connecting a support; 17. rotating the drum; 18. A pawl; 19. a driven wheel bracket; 19.1, fixing the shaft bracket; 19.2, fixing the shaft; 19.3, bearings; 19.4, a sleeve; 19.5 and a locknut.

The specific implementation mode is as follows:

as shown in fig. 1 to 7, the following technical solutions are adopted in the present embodiment:

an electric contact net maintenance ladder car comprises a ladder car chassis 1, a detachable ladder frame 2 and a working platform 3, wherein a driving battery pack 4, a transmission system 5, a wheel set 6 and an anti-overturning hand grip 7 are fixedly installed on the ladder car chassis 1, the detachable ladder frame 2 can be divided into an upper part, a middle part and a lower part, a tension wheel 14 is rotatably connected at the joint between the three parts of the detachable ladder frame 2, two tension ropes 11 are wound on the tension wheels 14 together, the two tension ropes 11 are nylon fiber tows formed by a plurality of nylon fiber yarns, one end of each of the two tension ropes 11 is fixedly connected with the anti-overturning hand grip 7, one end of each of the two tension ropes 11 far away from the anti-overturning hand grip 7 is fixedly connected with a rope reel 8, the side wall of one side, opposite to the two rope reels 8, is fixedly connected with a rotating drum 17 together, a bearing seat 9 is fixedly connected at the position between the two rope reels 8 and the rotating drum 17, the two bearing blocks I9 are fixedly connected to the upper surface of the working platform 3, an operating handle 12 is fixedly connected to the center of the outer side wall of the rotating drum 17, the upper end rod wall of the operating handle 12 abuts against the top end of the working platform 3, a pawl 18 is fixedly installed at the top end of the working platform 3, a ratchet 10 is fixedly sleeved on one of the rope discs 8 corresponding to the pawl 18, and the pawl 18 is meshed with the ratchet 10.

Wherein, terraced car chassis 1 includes two vertical roof beams 1.1, and two vertical roof beam 1.1 fixed connection are at the lower extreme that can dismantle ladder frame 2, and common fixed connection has a plurality of horizontal roof beams 1.3 on the lateral wall of two vertical roof beams 1.1 one side in opposite directions, and wherein two horizontal roof beams 1.3 common fixed connection have a short vertical roof beam 1.2.

Wherein, can dismantle ladder frame 2 includes a plurality of root ladder frames 2.1, wherein four root ladder frames 2.1 are matrix form fixed connection at two vertical roof beam 1.1 upper surfaces, a plurality of root ladder frames 2.1 all lead to 15 fixed connection with two phases pipe, the equal fixedly connected with screw thread fastener 2.2 of junction between a plurality of root ladder frames 2.1, all block up through screw thread fastener 2.2 between per two adjacent sub ladder frames 2.1, every two corresponding sub ladder frames 2.1 all are a slant pull rod 2.3 of slope form fixedly connected with on the pole wall of one side in opposite directions, wherein the fixed cover in top of four root ladder frames 2.1 has four three-phase pipe to lead to 13, the common fixed cover in top of four three-phase pipe to lead to 13 connects the lower extreme at work platform 3.

The transmission system 5 comprises a spline shaft 5.1, one end of the spline shaft 5.1 is fixedly connected to the output end of the driving battery pack 4, one end of the spline shaft 5.1, far away from the driving battery pack 4, is fixedly connected with a connecting shaft 5.2, one end of the connecting shaft 5.2, far away from the spline shaft 5.1, is fixedly connected with a gear commutator 5.3, the lower surface of the gear commutator 5.3 is fixedly connected with a bearing seat II 5.5, the bearing seat II 5.5 is fixedly connected to the center of the upper surface of one transverse beam 1.3, the output end of the gear commutator 5.3 is fixedly connected with two shaft couplers 5.6 in a symmetrical shape, and the gear commutator 5.3 is fixedly connected with two driving shafts 5.4 through the two shaft couplers 5.6 respectively.

The overturn-preventing hand grip 7 comprises four baffle plates 7.2, the four baffle plates 7.2 are respectively and fixedly connected to the side wall of one side, far away from two longitudinal beams 1.1, of the side wall, the baffle plates 7.2 are close to the lower end, two movable bolts 7.4 are rotatably connected between the inner side walls, facing to each other, of the lower ends of the baffle plates 7.2 through bearings, a copying rail-gripping claw 7.5 is fixedly sleeved on each of the two movable bolts 7.4, two fixed shaft pins 7.3 are arranged on the inner side walls, at the upper ends of the baffle plates 5.1 corresponding to the two copying rail-gripping claws 7.5, the two fixed shaft pins 7.3 are respectively clamped with the corresponding copying rail-gripping claws 7.5, one of the copying rail-gripping claws 7.5 is fixedly connected with one piston rod 7.1, the upper end of the piston rod 7.1 penetrates through the upper surface of the baffle plate 7.2 and extends upwards to the outside of the baffle plate 7.2, and is fixedly connected to the tensioning rope 11, and the overturn-preventing hand grip 7 selects Q235 steel as a manufacturing material.

Wherein, be four connection support 16 of matrix fixedly connected with on the lateral wall of one side is kept away from mutually to two vertical roof beam 1.1, four upper surface of connecting support 16 all fixedly connected with one from driving wheel support 19, four from the equal fixedly connected with wheel group 6 of one of them one end of driving wheel support 19, wherein two from driving wheel support 19 respectively with two drive shaft 5.4 fixed connection that correspond.

The four driven wheel supports 19 respectively comprise a fixed shaft support 19.1, the four fixed shaft supports 19.1 are respectively and fixedly connected to the upper surfaces of the four connecting supports 16, a bearing 19.3 is fixedly sleeved inside each of the four fixed shaft supports 19.1, a fixed shaft 19.2 is fixedly sleeved inside each of the four bearings 19.3, one end of each of the two fixed shafts 19.2 is respectively and fixedly connected with two corresponding driving shafts 5.4, the other end of each of the four fixed shafts 19.2 is respectively and fixedly connected with a sleeve 19.4, one end of each of the four sleeves 19.4 far away from the corresponding fixed shaft 19.2 is respectively and fixedly connected with four locknuts 19.5, and the four sleeves 19.4 are respectively and fixedly mounted with the corresponding wheel sets 6 through the four locknuts 19.5.

The driving battery pack 4 is fixedly arranged on the upper surface of the short longitudinal beam 1.2, the parameter determination model of the driving battery pack 4 is a lithium battery with an SDA10-4850/48V50AH arrangement, the output end of the driving battery pack 4 is fixedly provided with a direct current brush motor, and the output end of the direct current brush motor is fixedly connected to one end, close to the direct current brush motor, of the spline shaft 5.1.

The utility model discloses a user state does: the utility model relates to an electric contact net maintenance ladder car, when in use, the direct current brush motor is provided with power supply by a driving battery pack 4, the direct current brush motor drives a connecting shaft 5.2 to rotate by a spline shaft 5.1, the connecting shaft 5.2 drives two driving shafts 5.4 to synchronously rotate by a gear commutator 5.3, the driving shaft 5.4 drives a wheel set 6 to rotate by a driven wheel bracket 19, and then the ladder car is driven to move by rolling the wheel set 6 on a railway track, when the ladder car moves to a required position, a rotating drum 17 can be rotated by an operating handle 12, the rotating drum 17 drives a rope reel 8 to rotate, the rope reel 8 further recovers and winds the tensioning rope 11 on the rope reel, so that one section of the tensioning rope 11 positioned outside the rope reel 8 is tight, and the detachable ladder frame 2 is wholly stabilized by a tensioning wheel 14, and the tensioning rope 11 can upwards pull a piston rod 7.1 when tightened, the piston rod 7.1 upwards pulls the copying rail grabbing claws 7.5, so that the two copying rail grabbing claws 7.5 move in opposite directions, the rail of the railway is clamped and fixed, after the stabilization and positioning operation of the frame is completed, the pawl 18 is pressed to be meshed with the ratchet wheel 10, the rotation of the rotating drum 17 and the rope reel 8 can be avoided, the frame is prevented from loosening and moving randomly, meanwhile, the whole frame is spliced with the two-phase pipe through the sub-ladder frame 1.1 and the two-phase pipe through 15, the mounting and fixing are carried out through the threaded fastener 2.2, the structure is stably supported through the inclined pull rod 1.3, the copying rail grabbing claws are detached when the frame is not used or in the moving process, and the conveying is facilitated.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above, and it should be understood by those skilled in the art that the present invention is not limited by the above embodiments, which are only illustrative, but also various changes and modifications may be made without departing from the spirit and scope of the present invention, which fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. An electric contact net overhaul ladder car is characterized by comprising a ladder car chassis (1), a detachable ladder frame (2) and a working platform (3), wherein a driving battery pack (4), a transmission system (5), a wheel set (6) and an overturn-preventing grab handle (7) are fixedly mounted on the ladder car chassis (1), the detachable ladder frame (2) can be divided into an upper part, a middle part and a lower part, a tension wheel (14) is rotatably connected at a joint between the three parts of the detachable ladder frame (2), two tension ropes (11) are wound on the tension wheels (14) together, the two tension ropes (11) are nylon fiber tows formed by a plurality of overturn-preventing fibers, one end of each tension rope (11) is fixedly connected with the overturn-preventing grab handle (7), one end of each tension rope (11) far away from the overturn-preventing grab handle (7) is fixedly connected with a rope reel (8), two on the lateral wall of rope dish (8) one side in opposite directions common fixedly connected with one rotate drum (17), be located two equal fixedly connected with one bearing frame (9), two on rope dish (8) and the position of rotating between drum (17) bearing frame (9) fixed connection is at the upper surface of work platform (3), center department fixedly connected with one operating handle (12) of the lateral wall of rotation drum (17), the upper end pole wall of operating handle (12) offsets with the top of work platform (3), the top fixed mounting of work platform (3) has one pawl (18), corresponds pawl (18) are located one of them rope dish (8) and have fixedly cup jointed a ratchet (10), pawl (18) mesh with ratchet (10).

2. The electric overhead line system maintenance ladder truck as claimed in claim 1, characterized in that: ladder car chassis (1) includes two vertical roof beams (1.1), two vertical roof beam (1.1) fixed connection is at the lower extreme that can dismantle ladder frame (2), two common fixedly connected with a plurality of horizontal roof beams (1.3) on the lateral wall of vertical roof beam (1.1) one side in opposite directions, wherein two the common fixedly connected with of horizontal roof beam (1.3) is short vertical roof beam (1.2).

3. The electric overhead line system maintenance ladder truck as claimed in claim 1, characterized in that: can dismantle ladder frame (2) including a plurality of root ladder frame (2.1), wherein four sub ladder frame (2.1) is matrix form fixed connection at two vertical roof beams (1.1) upper surfaces, a plurality of sub ladder frame (2.1) all with two-phase pipe expert (15) fixed connection, a plurality of equal fixedly connected with screw thread fastener (2.2) of junction between sub ladder frame (2.1), every two adjacent all through screw thread fastener (2.2) looks joint between sub ladder frame (2.1), every two are corresponding sub ladder frame (2.1) all are an oblique pull rod (2.3) of slope form fixedly connected with on the pole wall of one side in opposite directions, wherein four the fixed cover in top of sub ladder frame (2.1) has four three-phase pipe expert (13), four the top of three-phase pipe expert (13) is fixed cup joint the lower extreme in work platform (3) jointly.

4. The electric overhead line system maintenance ladder truck as claimed in claim 1, characterized in that: drive system (5) include a integral key shaft (5.1), the wherein one end fixed connection of integral key shaft (5.1) is at the output of drive battery group (4), integral key shaft (5.1) is kept away from one end fixedly connected with connecting axle (5.2) of drive battery group (4), the one end fixedly connected with gear commutator (5.3) of integral key shaft (5.1) is kept away from in connecting axle (5.2), the lower fixed surface of gear commutator (5.3) is connected with a bearing frame two (5.5), bearing frame two (5.5) fixed connection is located at the center of one of them transverse beam (1.3) upper surface, the output of gear commutator (5.3) is two shaft couplings of symmetry form fixedly connected with (5.6), gear commutator (5.3) are two drive shafts (5.4) of fixedly connected with respectively through two shaft couplings (5.6).

5. The electric overhead line system maintenance ladder truck as claimed in claim 1, characterized in that: the overturn-preventing gripper (7) comprises four baffles (7.2), the four baffles (7.2) are respectively and fixedly connected to the side wall of one side, which is far away from two longitudinal beams (1.1), two movable bolts (7.4) are rotatably connected between the opposite inner side walls of the baffles (7.2) close to the lower end through bearings, two movable bolts (7.4) are fixedly sleeved with one copying rail-grabbing claw (7.5), two corresponding fixed shaft pins (7.3) are arranged on the inner side wall of the upper end of the baffle (7.2) of the copying rail-grabbing claw (7.5), the two fixed shaft pins (7.3) are respectively and correspondingly clamped with the copying rail-grabbing claw (7.5), one of the two fixed shaft pins is fixedly connected with one piston rod (7.1) on the copying rail-grabbing claw (7.5), the upper end of the piston rod (7.1) penetrates through the upper surface of the baffle (7.2) and upwards extends to the outside of the baffle (7.2), and is fixedly connected to the rope (11), and the overturn-preventing gripper (7) selects Q235 steel as a manufacturing material.

6. The electric overhead line system maintenance ladder truck as claimed in claim 2, characterized in that: two be four connection support (16) of matrix fixedly connected with on the lateral wall of one side is kept away from mutually to vertical roof beam (1.1), four the equal fixedly connected with of upper surface of connection support (16) follows driving wheel support (19), four follow driving wheel support (19) wherein one end equal fixedly connected with one wheel group (6), wherein two follow driving wheel support (19) respectively with two drive shaft (5.4) fixed connection that correspond.

7. The electric overhead line system maintenance ladder truck as claimed in claim 6, characterized in that: the four driven wheel supports (19) respectively comprise a fixed shaft support (19.1), the four fixed shaft supports (19.1) are respectively and fixedly connected to the upper surfaces of the four connecting supports (16), a bearing (19.3) is respectively and fixedly sleeved inside the four fixed shaft supports (19.1), a fixed shaft (19.2) is respectively and fixedly sleeved inside the four bearings (19.3), one end of each of the two fixed shafts (19.2) is respectively and fixedly connected with the two corresponding driving shafts (5.4), the other end of each of the four fixed shafts (19.2) is respectively and fixedly connected with a sleeve (19.4), one end, far away from the fixed shaft (19.2), of each of the four sleeves (19.4) is respectively and fixedly connected with the corresponding wheel set (6) through the four anti-loosening nuts (19.5).

8. The electric overhead line system maintenance ladder truck as claimed in claim 4, characterized in that: drive battery pack (4) fixed mounting is at the upper surface of short longitudinal beam (1.2), drive battery pack (4) parameter determination model is the lithium cell that SDA10-4850/48V50AH set up, the output fixed mounting of drive battery pack (4) has the brush motor of direct current, the output fixed connection of direct current brush motor has the one end that the brush motor is close to direct current in integral key shaft (5.1).