CN112026894A - Engineering handcart capable of automatically adjusting gravity center - Google Patents

Abstract

The invention discloses an engineering handcart capable of automatically adjusting the gravity center, which comprises a vertical push plate, wherein the lower end surface of the vertical push plate is fixedly connected with a horizontal bearing plate, the upper side of the horizontal bearing plate is provided with a cargo carrying box which is positioned at the left side of the vertical push plate and can slide left and right, the cargo carrying box is internally communicated with a cargo carrying cavity with an upward opening, the upper end of the right end surface of the vertical push plate is fixedly connected with a handle, a plectrum cavity is arranged in the handle, a plectrum rotating shaft is rotatably connected between the front wall and the rear wall of the plectrum cavity, and a first plectrum is fixedly connected to the upper side of the outer circular surface of the plectrum rotating shaft. The service life of the transmission workpiece is reduced.

Description

Engineering handcart capable of automatically adjusting gravity center

Technical Field

The invention relates to the technical field of engineering trolleys, in particular to an engineering trolley capable of automatically adjusting the gravity center.

Background

In our daily life, building projects are always required to be built and developed to carry out civil engineering, construction sites are always disorderly and disorderly, and the engineering handcart is low in manufacturing cost, light in weight, free of working condition limitation and widely used, but the engineering handcart is easily limited by the site in the using process, so that the efficiency of objects in the transportation process is reduced, and manpower is wasted. When the existing engineering handcart is used in a construction site, once the existing engineering handcart meets an obstacle, the existing engineering handcart can only go around the road, time and labor are wasted, and the working efficiency is reduced.

Disclosure of Invention

In order to solve the problems, the engineering handcart capable of automatically adjusting the gravity center is designed, and comprises a vertical push plate, a horizontal bearing plate is fixedly connected to the lower end face of the vertical push plate, a cargo carrying box which is positioned on the left side of the vertical push plate and can slide left and right is arranged on the upper side of the horizontal bearing plate, a cargo carrying cavity with an upward opening is communicated with the cargo carrying box, a handle is fixedly connected to the upper end of the right end face of the vertical push plate, a shifting sheet cavity is arranged in the handle, a shifting sheet rotating shaft is rotatably connected between the front wall and the rear wall of the shifting sheet cavity, a first shifting sheet is fixedly connected to the upper side of the outer circular face of the shifting sheet rotating shaft, a first shifting sheet sliding groove which is positioned on the upper side of the shifting sheet cavity and has an upward opening is arranged in the handle, and the upper end face of the first shifting sheet penetrates through the, a second plectrum is fixedly arranged on the lower side of the outer circular surface of the plectrum rotating shaft, a second slider cavity is arranged on the left side of the plectrum cavity, a second slider connecting rod capable of sliding left and right is arranged between the second slider cavity and the plectrum cavity, the right end surface of the second slider connecting rod extends into the plectrum cavity and is fixedly connected with a first slider, the right end surface of the first slider is abutted against the lower end of the second plectrum, the left end surface of the second slider connecting rod extends into the second slider cavity and is fixedly connected with a second slider, a first spring surrounding the second slider connecting rod is fixedly connected between the right end surface of the second slider and the right wall of the second slider cavity, a first contact switch which is arranged on the left side of the second slider cavity, a second contact switch is fixedly arranged in the left wall of the second slider cavity, a third slider cavity is arranged in the vertical push plate, and a third sliding plate capable of sliding left and right is arranged in the third sliding plate cavity, the cargo carrying box is characterized in that a first connecting rope is fixedly connected to the right end face of the third sliding plate, the right end of the first connecting rope extends to the right side of the vertical push plate and is fixedly connected with a pull ring, a pull ring hole which penetrates through the pull ring from top to bottom is formed in the pull ring, a second connecting rope is fixedly connected to the left end face of the third sliding plate, the left end face of the third sliding plate and the left wall of a cavity of the third sliding plate are fixedly connected with one another and encircle the second spring of the second connecting rope, a translation device is arranged in the horizontal bearing plate and can control the cargo carrying box to move left and right, the gravity center of the cargo carrying box is changed, damping devices are arranged on the front side and the rear side of the lower end.

Preferably, the translation device comprises an internal gear transmission cavity arranged on the horizontal bearing plate, a power motor is fixedly arranged in the right wall of the gear transmission cavity, the left end face of the power motor is in power connection with a worm rotating shaft, the left end face of the worm rotating shaft extends into the gear transmission cavity, the axis of the worm rotating shaft is fixedly connected with a worm, the upper side of the worm is meshed with a worm wheel rotatably connected to the rear wall of the gear transmission cavity, the upper side of the worm wheel is provided with a first sliding block capable of sliding left and right in the gear transmission cavity, the lower end face of the first sliding block is fixedly connected with a rack, the lower end face of the rack is meshed with the worm wheel, the upper side of the gear transmission cavity is communicated with a first sliding block connecting rod sliding groove with an upward opening, the upper end face of the first sliding block is fixedly connected with a first sliding block connecting rod, the upper end face of the first sliding block, the left side and the right side of the first sliding block connecting rod sliding groove are respectively communicated with two sealing plate sliding grooves which are bilaterally symmetrical, the left side and the right side of the first sliding block connecting rod sliding groove are respectively internally provided with a sealing plate which can slide left and right, and the left side of the sealing plate is fixedly connected with the left end face and the right end face of the sealing plate respectively.

Preferably, when the first contact switch is in contact with the second contact switch, the power is electrically started, so that the cargo box is controlled to move left and right, and the left and right movement of the center of gravity of the whole device is realized.

Preferably, the damping device comprises fixing blocks fixedly connected to the front end and the rear end of the lower end face of the horizontal bearing plate respectively, a fourth sliding plate capable of sliding up and down is arranged in the fixing block, the front end and the rear end of the fourth sliding plate are respectively fixedly connected with telescopic rods, the front end and the rear end of each telescopic rod extend to the lower end faces of the fixed blocks, the lower end faces of the fourth sliding plate and the lower end faces of the fourth sliding plate are respectively connected with damping blocks, and the front end and the rear end of each damping block are respectively connected with the lower end face of the fourth sliding plate and fixedly connected.

Preferably, the braking device comprises a braking box which is fixedly arranged on the lower end face of the horizontal bearing plate and is positioned between the front fixing block and the rear fixing block, a braking cavity is arranged in the braking box, a fifth sliding plate capable of sliding left and right is arranged in the braking cavity, the right end face of the fifth sliding plate is fixedly connected to the second connecting rope, a fifth spring which surrounds the second connecting rope is fixedly connected between the right end face of the fifth sliding plate and the right wall of the braking cavity, a connecting block which is positioned on the left side of the fifth sliding plate is fixedly connected to the lower wall of the braking cavity, a braking piece is hinged to the upper side of the connecting block, and a braking piece connecting rope is fixedly connected between the right end face of the upper braking plate and the fifth sliding.

Preferably, horizontal bearing plate downside is equipped with the initiative wheel pivot, around the initiative wheel pivot both ends face run through respectively around two the snubber block just extends to both sides around the horizontal bearing plate, both ends face is axle center fixedly connected with initiative wheel respectively around the initiative wheel pivot, two driven wheel fixed plates of symmetry around the horizontal bearing plate lower extreme end center fixedly connected with of department rotate between the driven wheel fixed plate and are connected with the driven wheel pivot, the fixed cover of the outer disc of driven wheel pivot is equipped with the driven wheel that the axle center is just right.

Preferably, the lower end of the right end face of the horizontal bearing plate is fixedly connected with a fixed rod, and the pull ring can be fixed on the fixed rod through the pull ring hole, so that the whole device is kept static.

The invention has the beneficial effects that: the device realizes the gravity center movement of the whole device by horizontally moving the space position of the container, is convenient for a user to perform actions such as lifting, pressing and the like required in the process of using the device, saves the physical strength of the user, is provided with the sealing plate to prevent dust from entering the transmission cavity, and reduces the service life of a transmission workpiece.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the structure A-A of FIG. 1;

FIG. 3 is a schematic top view of the tab of the present invention;

FIG. 4 is an enlarged schematic view of B of FIG. 1;

fig. 5 is an enlarged schematic view of C in fig. 1.

Detailed Description

The invention will now be described in detail with reference to fig. 1-5, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The invention relates to an engineering handcart capable of automatically adjusting the gravity center, which comprises a vertical push plate 11, wherein a horizontal bearing plate 12 is fixedly connected to the lower end surface of the vertical push plate 11, a cargo carrying box 13 which is positioned on the left side of the vertical push plate 11 and can slide left and right is arranged on the upper side of the horizontal bearing plate 12, a cargo carrying cavity 14 with an upward opening is communicated in the cargo carrying box 13, a handle 15 is fixedly connected to the upper end of the right end surface of the vertical push plate 11, a plectrum cavity 16 is arranged in the handle 15, a plectrum rotating shaft 17 is rotatably connected between the front wall and the rear wall of the plectrum cavity 16, a first plectrum 18 is fixedly connected to the upper side of the outer circular surface of the plectrum rotating shaft 17, a first plectrum sliding groove 19 which is positioned on the upper side of the plectrum cavity 16 and has an upward opening is arranged in the handle 15, the upper end surface of the first plectrum 18 penetrates through the first plectrum, a second slider cavity 22 is arranged on the left side of the plectrum cavity 16, a second slider connecting rod 23 capable of sliding left and right is arranged between the second slider cavity 22 and the plectrum cavity 16, the right end surface of the second slider connecting rod 23 extends into the plectrum cavity 16 and is fixedly connected with a first slider 21, the right end surface of the first slider 21 is abutted against the lower end of the second plectrum 20, the left end surface of the second slider connecting rod 23 extends into the second slider cavity 22 and is fixedly connected with a second slider 24, a first spring 25 surrounding the second slider connecting rod 23 is fixedly connected between the right end surface of the second slider 24 and the right wall of the second slider cavity 22, a first contact switch 26 arranged on the left side is arranged in the second slider 24, a second contact switch 27 is fixedly arranged in the left wall of the second slider cavity 22, a third slider cavity 28 is arranged in the vertical push plate 11, a third slide plate 29 capable of sliding left and right is arranged in the third slider cavity 28, the utility model discloses a container carrier 13, including first slide board, third slide board, horizontal bearing plate 12, third slide board, horizontal bearing plate 12, third slide board 29 right-hand member fixedly connected with first connecting rope 30, first connecting rope 30 right-hand member extends to vertical push pedal 11 right side and fixedly connected with pull ring 31, be equipped with pull ring hole 32 that runs through from top to bottom in the pull ring 31, third slide board 29 left end face fixedly connected with second connecting rope 34, be equipped with translation device 101 in the horizontal bearing plate 12, translation device 101 can control the container carrier 13 is moved about, and then changes the focus, both sides are equipped with damping device 102 respectively before and after the lower terminal.

Beneficially, the translation device 101 includes an internal gear transmission cavity 36 disposed on the horizontal bearing plate 12, a power motor 37 is fixedly disposed in a right wall of the gear transmission cavity 36, a worm shaft 38 is power-connected to a left end surface of the power motor 37, a worm 39 is fixedly connected to an axis of the worm shaft 38 and extends into the gear transmission cavity 36, a worm wheel 40 rotatably connected to a rear wall of the gear transmission cavity 36 is engaged with an upper side of the worm 39, a first slider 41 capable of sliding left and right in the gear transmission cavity 36 is disposed on an upper side of the worm wheel 40, a rack 42 is fixedly connected to a lower end surface of the first slider 41, a lower end surface of the rack 42 is engaged with the worm wheel 40, a first slider link sliding slot 43 with an upward opening is communicated with an upper side of the gear transmission cavity 36, and a first slider link 44 is fixedly connected to an upper end surface of the first slider 41, the upper end surface of the first slider connecting rod 44 extends to the upper side of the horizontal bearing plate 12 and is fixedly connected to the lower end surface of the cargo carrying box 13, the left side and the right side of the first slider connecting rod sliding groove 43 are respectively communicated with two sealing plate sliding grooves 45 which are bilaterally symmetrical, sealing plates 46 which can slide left and right are arranged in the sealing plate sliding grooves 45, the right end surface and the right side of the sealing plate 46 are respectively and fixedly connected to the left end surface and the right end surface of the first slider connecting rod 44.

Advantageously, when the first contact switch 26 is in contact with the second contact switch 27, the power motor 37 is activated to control the container 13 to move left and right, thus realizing the left and right movement of the center of gravity of the whole device.

Beneficially, the damping device 102 includes fixing blocks 47 respectively fixedly connected to the front and rear ends of the lower end surface of the horizontal bearing plate 12, a fourth sliding plate 49 capable of sliding up and down is disposed in the fixing block 47, telescopic rods 50 are fixedly connected to the lower end surfaces of the front and rear fourth sliding plates 49, the lower end surfaces of the front and rear telescopic rods 50 respectively extend to the lower side of the fixing block 47 and are fixedly connected with damping blocks 52, and a damping spring 51 surrounding the telescopic rods 50 is fixedly connected between the lower end surface of the front and rear fourth sliding plates 49 and the lower wall of the fourth sliding plate cavity 48.

Advantageously, the braking device 103 includes a braking box 55 fixedly disposed on the lower end surface of the horizontal bearing plate 12 and located between the front and rear fixing blocks 47, a braking chamber 56 is disposed in the braking box 55, a fifth sliding plate 57 capable of sliding left and right is disposed in the braking chamber 56, the right end surface of the fifth sliding plate 57 is fixedly connected to the second connecting rope 34, a fifth spring 58 surrounding the second connecting rope 34 is fixedly connected between the right end surface of the fifth sliding plate 57 and the right wall of the braking chamber 56, a connecting block 59 located on the left side of the fifth sliding plate 57 is fixedly connected to the lower wall of the braking chamber 56, a braking piece 60 is hinged to the upper side of the connecting block 59, and a braking piece connecting rope 61 is fixedly connected between the right end surface of the braking piece 60 and the fifth sliding plate 57.

Beneficially, horizontal bearing plate 12 downside is equipped with initiative wheel pivot 53, two around the both ends face runs through respectively around initiative wheel pivot 53 two snubber blocks 52 and extend to both sides around horizontal bearing plate 12, two axle center fixedly connected with initiative wheel 54 respectively around initiative wheel pivot 53, two driven wheel fixed plates 62 of symmetry around the lower extreme face right-hand member center department fixedly connected with of horizontal bearing plate 12, two around the driven wheel fixed plate 62 rotate between the connection has driven wheel pivot 63, the fixed cover in the outer disc of driven wheel pivot 63 is equipped with the dead-end driven wheel 64 in axle center.

Advantageously, a fixing rod 35 is fixedly connected to the lower end of the right end face of the horizontal bearing plate 12, and the pull ring 31 can be fixed to the fixing rod 35 through the pull ring hole 32, so that the whole device is kept still.

The following will describe in detail the use steps of a mobile engineering truck with an automatically adjustable center of gravity with reference to fig. 1 to 5:

in the initial state, the first spring 25 positions the second slider 24 at the right limit position in the second slider chamber 22, the second slider 24 abuts the right end surface of the first slider 21 against the second paddle 20 via the second slider link 23, the second spring 33 positions the third slide plate 29 at the left limit position, the brake piece 60 is positioned at the left limit position by its own weight and stretches the brake piece connecting rope 61, the fifth spring 58 positions the fifth slide plate 57 at the left limit position in the brake chamber 56, and the damper spring 51 is in a compressed state.

In operation, the handle 15 is held by hand, the handle 15 is pushed, the handle 15 drives the vertical push plate 11 to move, the vertical push plate 11 drives the horizontal bearing plate 12 to move, the container carrier 13 is driven to move, the driving wheel 54 and the driven wheel 64 are rotated, the first shifting piece 18 is manually shifted backwards, the first shifting piece 18 drives the shifting piece rotating shaft 17 to rotate clockwise under the circumstances, the shifting piece rotating shaft 17 drives the second shifting piece 20 to move leftwards, the second shifting piece 20 drives the first sliding block 21 to slide leftwards, the second sliding block 24 is further driven to move leftwards through the second sliding block connecting rod 23 and stretches the first spring 25, the second sliding block 24 enables the first contact switch 26 to be communicated with the second contact switch 27, the power motor 37 is started, the power motor 37 drives the worm rotating shaft 38 to rotate so as to drive the worm 39 to rotate, the worm 39 drives the worm wheel 40 to rotate through the gear teeth meshing, the worm wheel 40 drives the rack 42 to move leftwards through, the rack 42 drives the first slider 41 to move leftwards, the first slider 41 drives the first slider link 44 to move leftwards, the first slider link 44 drives the left and right sealing plates 46 to slide leftwards and rightwards in the sealing plate sliding groove 45, so that the gear transmission cavity 36 is always kept in a closed state, meanwhile, the first slider link 44 drives the cargo carrying box 13 to move leftwards, so that the gravity center of the whole device moves leftwards, a worker can more save labor in the carrying process, when encountering an obstacle, the reverse power motor 37 can move the gravity center of the device backwards, the force arm of gravity is shortened, the worker can conveniently press the handle 15 downwards to lift the driving wheel 54 and further stride over the obstacle, when encountering a downhill road section, the pull ring 31 is manually pulled, the pull ring 31 enables the third sliding plate 29 to slide rightwards through the first connecting rope 30, the third sliding plate 29 compresses the second spring 33 and stretches the second connecting rope 34, the second connecting rope 34 in the braking cavity 56 compresses the fifth spring 58 and enables the fifth sliding plate 57 to slide rightwards, the fifth sliding plate 57 enables the brake block 60 to rotate around the connecting block 59 through the brake block connecting rope 61, so that the friction force of the outer circular surface of the driving wheel rotating shaft 53 is increased, the rotating speed of the driving wheel 54 is reduced, the problem that the vehicle speed is difficult to control due to the fact that objects in the cargo carrying cavity 14 are too heavy is solved, when the device is not needed, the pull ring 31 is pulled to the right limit position, the friction force between the brake block 60 and the driving wheel rotating shaft 53 is in the maximum state, and the pull ring 31 is sleeved on the fixing rod 35.

The invention has the beneficial effects that: the device realizes the gravity center movement of the whole device by horizontally moving the space position of the container, is convenient for a user to perform actions such as lifting, pressing and the like required in the process of using the device, saves the physical strength of the user, is provided with the sealing plate to prevent dust from entering the transmission cavity, and reduces the service life of a transmission workpiece.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (7)

1. The utility model provides an engineering handcart that can automatic adjustment focus, includes vertical push pedal, its characterized in that: the lower end surface of the vertical push plate is fixedly connected with a horizontal bearing plate, the upper side of the horizontal bearing plate is provided with a cargo carrying box which is positioned at the left side of the vertical push plate and can slide left and right, the cargo carrying box is internally communicated with a cargo carrying cavity with an upward opening, the upper end of the right end surface of the vertical push plate is fixedly connected with a handle, a shifting sheet cavity is arranged in the handle, a shifting sheet rotating shaft is rotatably connected between the front wall and the rear wall of the shifting sheet cavity, the upper side of the outer circular surface of the shifting sheet rotating shaft is fixedly connected with a first shifting sheet, a first shifting sheet sliding groove which is positioned at the upper side of the shifting sheet cavity and has an upward opening is arranged in the handle, the upper end surface of the first shifting sheet penetrates through the first shifting sheet sliding groove and extends to the upper side of the handle, the lower side of the outer circular surface of the shifting sheet rotating shaft is fixedly provided with a second shifting sheet, the left, the right end face of the connecting rod of the second slide block extends into the plectrum cavity and is fixedly connected with a first slide block, the right end face of the first slide block is abutted against the lower end of the second plectrum, the left end face of the connecting rod of the second slide block extends into the cavity of the second slide block and is fixedly connected with a second slide block, a first spring surrounding the connecting rod of the second slide block is fixedly connected between the right end face of the second slide block and the right wall of the cavity of the second slide block, a first contact switch towards the left is arranged in the second slide block, a second contact switch is fixedly arranged in the left wall of the cavity of the second slide block, a third slide plate cavity is arranged in the vertical push plate, a third slide plate capable of sliding left and right is arranged in the third slide plate cavity, a first connecting rope is fixedly connected to the right end face of the third slide plate, the right end face of the first connecting rope extends to the right side of the vertical push plate and is fixedly, the left end face of the third sliding plate is fixedly connected with a second connecting rope, a second spring surrounding the second connecting rope is fixedly connected between the left end face of the third sliding plate and the left wall of the cavity of the third sliding plate, a translation device is arranged in the horizontal bearing plate and can control the cargo carrying box to move left and right so as to change the center of gravity, damping devices are respectively arranged on the front side and the rear side of the lower end face of the horizontal bearing plate, and a braking device is arranged between the front damping device and the rear damping device.

2. An engineering truck capable of automatically adjusting the center of gravity as claimed in claim 1, wherein: the translation device comprises an internal gear transmission cavity arranged on the horizontal bearing plate, a power motor is fixedly arranged in the right wall of the gear transmission cavity, the left end face of the power motor is in power connection with a worm rotating shaft, the left end face of the worm rotating shaft extends into the gear transmission cavity, the axis of the worm rotating shaft is fixedly connected with a worm, the upper side of the worm is meshed with a worm wheel rotatably connected to the rear wall of the gear transmission cavity, the upper side of the worm wheel is provided with a first sliding block capable of sliding left and right in the gear transmission cavity, the lower end face of the first sliding block is fixedly connected with a rack, the lower end face of the rack is meshed with the worm wheel, the upper side of the gear transmission cavity is communicated with a first sliding block connecting rod sliding groove with an upward opening, the upper end face of the first sliding block is fixedly connected with a first sliding block connecting rod, the upper end face of the first, the left side and the right side of the first sliding block connecting rod sliding groove are respectively communicated with two sealing plate sliding grooves which are bilaterally symmetrical, the left side and the right side of the first sliding block connecting rod sliding groove are respectively internally provided with a sealing plate which can slide left and right, and the left side of the sealing plate is fixedly connected with the left end face and the right end face of the sealing plate respectively.

3. An engineering truck capable of automatically adjusting the center of gravity as claimed in claim 2, wherein: when the first contact switch is in contact with the second contact switch, the power is electrically started, so that the cargo box is controlled to move left and right, and the left and right movement of the center of gravity of the whole device is realized.

4. An engineering truck capable of automatically adjusting the center of gravity as claimed in claim 3, wherein: damping device including respectively fixed connection in the fixed block at both ends around the terminal surface under the horizontal bearing plate, be equipped with gliding fourth slide from top to bottom in the fixed block, two around, the equal fixedly connected with telescopic link of terminal surface under the fourth slide, two around the telescopic link the terminal surface extends to respectively under the telescopic link fixed block downside and fixedly connected with snubber block, two around the fourth slide terminal surface under with fixedly connected with encircle between the fourth slide chamber lower wall in the damping spring of telescopic link.

5. An engineering truck capable of automatically adjusting the center of gravity as claimed in claim 4, wherein: the braking device comprises a braking box which is fixedly arranged on the lower end face of the horizontal bearing plate and is positioned between the front fixing block and the rear fixing block, a braking cavity is arranged in the braking box, a fifth sliding plate capable of sliding left and right is arranged in the braking cavity, the right end face of the fifth sliding plate is fixedly connected to the second connecting rope, a fifth spring surrounding the second connecting rope is fixedly connected between the right end face of the fifth sliding plate and the right wall of the braking cavity, a connecting block positioned on the left side of the fifth sliding plate is fixedly connected to the lower wall of the braking cavity, a braking piece is hinged to the upper side of the connecting block, and a braking piece connecting rope is fixedly connected between the right end face of the upper braking piece and the fifth sliding plate.

6. An engineering truck capable of automatically adjusting the center of gravity as claimed in claim 5, wherein: horizontal bearing plate downside is equipped with the initiative wheel pivot, two around both ends face runs through respectively around the initiative wheel pivot the snubber block just extends to both sides around the horizontal bearing plate, both ends face is axle center fixedly connected with initiative wheel respectively around the initiative wheel pivot, two driven wheel fixed plates of symmetry around the fixed connection of terminal surface right-hand member center department under the horizontal bearing plate, two around the driven wheel fixed plate rotate between the driven wheel fixed plate and be connected with the driven wheel pivot, the fixed cover of outer disc in driven wheel pivot is equipped with the just right driven wheel in axle center.

7. An engineering truck capable of automatically adjusting the center of gravity as claimed in claim 6, wherein: the lower end of the right end face of the horizontal bearing plate is fixedly connected with a fixed rod, and the pull ring can be fixed to the fixed rod through the pull ring hole, so that the whole device is kept static.

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