CN102730037B

CN102730037B - Power-driven hand-push loading, unloading and transporting vehicle

Info

Publication number: CN102730037B
Application number: CN201110223838.3A
Authority: CN
Inventors: 曹东峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-06-24
Filing date: 2011-08-05
Publication date: 2014-10-01
Anticipated expiration: 2031-08-05
Also published as: CN102730037A

Abstract

The invention provides a power-driven hand-push loading, unloading and transporting vehicle. The power-driven hand-push loading, unloading and transporting vehicle comprises a main vehicle frame, a brake anti-collision push-pull rod, a lifting vehicle frame and a lifting mechanism, wherein a driving wheel and a universal wheel are arranged on the main vehicle frame, the driving wheel is connected with a power device, and the main vehicle frame is provided with a brake mechanism corresponding to the driving wheel; a handlebar is arranged at the back end of the main vehicle frame, the back end of the main vehicle frame is articulated with the brake anti-collision push-pull rod, and the forward rotation of the main vehicle frame can enable the brake mechanism to act; the lifting vehicle frame is arranged on the main vehicle frame and articulated with the front part of the main vehicle frame, a fork is arranged at the front end of the lifting vehicle frame, and the upper surface of the lifting vehicle frame and the fork constitute a cargo carrying part; and the lifting mechanism is arranged between the main vehicle frame and the lifting vehicle frame. The transporting vehicle can enter and exit from a narrow space and linger, and has the advantages of greater transport capacity, safety and reliability.

Description

Power-driven hand-push loading and unloading carrier

Technical Field

The invention relates to a carrier, in particular to a hand-push loading and unloading carrier.

Background

In the prior art, in the process of transporting bagged goods by a train or a motor container freight car, the labor intensity in the loading and unloading process is very high, and the efficiency is very low. The reason is that the space in the train or the wagon is small, and the conventional carrying machinery cannot enter or exit. Therefore, the transportation is often performed by human power. Taking a conventional railroad car carrying 1200 bags of fertilizer, 50kg per bag, 60 tons for a total of 60 tons as an example, a carrier carries one bag at a time, and the two bags need to be moved 1200 times, the length of the conventional railroad car is 12.5 meters, the distance between the railroad car and a platform unloading point is 25 meters, and the distance of one single pass for carrying goods is about 18 meters on average after being reduced. When loading and unloading goods from one wagon, the carrier is about to carry a load and walk for twenty kilometers. It is very labor intensive. The problem to be solved in the field is to find a device which can thoroughly solve the heavy loading and unloading work of the human back and shoulder.

In the prior art, a small-sized carrying tool, i.e. a trolley, is available, which can be two-wheeled or also one-wheeled. The cart can be conveniently moved into a small train or truck bed and swiveled therein. However, the hand cart in the prior art is completely pushed by manpower, and the hand cart only has two or three or hundred kilograms at most when carrying goods at a time. Moreover, the existing trolley is used, the unloading and stacking of goods cannot be completed integrally at one time, and the trolley is troublesome.

The prior art also provides a small carrying tool ground cattle, which has the defects that the requirement on the flatness of the ground is extremely high, and a tray is required to be equipped as an auxiliary tool, so that the loading, unloading and carrying of bagged goods cannot be conveniently completed.

The forklift in the prior art can also be used as a carrying tool, and has the defects of overlarge volume, overweight self and inconvenience in getting in and out of a train wagon or a carriage. In addition, the forklift also needs a tray as an auxiliary tool, and is inconvenient to use. For example, a 60 ton railroad car, carrying bagged goods, typically requires 30 pallets 1.2 meters long and 1.2 meters wide. When carrying goods, the additional tray needs to be moved manually, and extra large manpower and material resources are consumed, and the carrying cost is greatly improved.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a power-driven hand-propelled loading and unloading carrier which can conveniently get in and out a keyboard in a narrow space and has larger transportation capacity.

The purpose of the invention is realized as follows:

the invention provides a power-driven hand-pushed loading and unloading carrier which is characterized by comprising a main frame, a brake anti-collision push-pull rod, a lifting frame and a lifting mechanism, wherein the main frame is provided with a plurality of push-pull rods;

the upper part of the main frame is provided with a supporting surface, the lower part of the main frame is provided with a front wheel and a rear wheel, one of the front wheel and the rear wheel is a driving wheel, the other one is a universal wheel, the number of the driving wheels is two, and one or two universal wheels are provided; the two driving wheels are connected with a power device through a transmission mechanism; the main frame is provided with a brake mechanism corresponding to the two driving wheels;

the brake anti-collision push-pull rod is hinged to the rear end of the main frame and arranged along the width direction of the main frame; two including the brake piece that can reset in the brake mechanism, it respectively through the connecting piece with the body of rod of brake anticollision push-and-pull rod is articulated, and this pin joint is: when the brake anti-collision push-pull rod rotates around the hinge point in two directions, the brake anti-collision push-pull rod drives the brake piece to move in one direction and also acts as a driving wheel to brake;

the lifting frame is provided with a loading surface and is hinged with the main frame, and the hinge structure is as follows: so that the lifting frame rotates around the hinge shaft between the following two positions: the first position is that the lifting frame is arranged on the supporting surface of the main frame, the cargo carrying surface faces upwards, and the second position is that the lifting frame is erected in front of the front end of the main frame and the lower end of the lifting frame is grounded;

the lifting mechanism comprises two parts which are connected with each other and can move relatively, wherein one part is arranged on the main frame, the other part is connected with the lifting frame, so that the lifting frame rotates around the hinge shaft between the two positions, and the lifting mechanism is connected with a lifting power device or a manual mechanism and drives the two parts to move relatively.

The power device comprises an engine and an oil tank connected with the engine, and the engine and the oil tank are all fixedly arranged on the main frame; an output shaft of the engine is connected with the two driving wheels through a transmission mechanism; or,

the power device comprises a motor and a storage battery connected with the motor, and the motor and the storage battery are fixedly arranged on the main frame; and an output shaft of the motor is connected with the two driving wheels through a transmission mechanism.

When the power device is an engine, a clutch is arranged in a transmission mechanism between an output shaft of the engine and the driving wheel, a clutch push rod is hinged at the rear end of the main frame and is connected with a clutch arm on the clutch through a connecting piece, so that the driving wheel is separated from the power device even if the clutch is in a disconnected state by rotating the clutch push rod forwards, the clutch push rod is positioned in front of the brake anti-collision push-pull rod and is positioned on a track of the brake anti-collision push-pull rod forwards, and the brake anti-collision push-pull rod is pressed to generate a braking action and simultaneously rotates to generate a separating action; or,

when the power device is a motor, the power device comprises the motor, a motor controller, a three-state switch, a speed regulation handle and a storage battery, wherein the storage battery, the motor controller and the motor are fixedly arranged on the main frame, the three-state switch is arranged at the rear end of the main frame, and the speed regulation handle is arranged on the handle at the rear end of the main frame; two ends of the three-state switch are connected with a motor state control end of the motor controller through a lead to control the forward rotation, stop and reverse rotation of the motor; and the signal output end of the speed regulating handle is connected with a speed regulating port of the motor controller through a wire to control the rotating speed of the motor.

When the power device is an engine, a transmission mechanism arranged between the engine and the driving wheel comprises a gearbox, an output shaft of the engine is directly or indirectly connected with an input shaft of the gearbox through a transmission device, an output shaft on the gearbox is connected with the driving wheel, the clutch is arranged in a transmission chain between the output shaft of the engine and the driving wheel, and a resettable clutch arm arranged on the clutch is connected with a clutch push rod through a flexible wire or a pull rod;

a speed change sliding gear set is arranged on one transmission shaft in a transmission system in the gearbox and is arranged at different positions so that different gears between the input shaft and the output shaft are meshed or not meshed with any gear on the upstream transmission shaft to form different speed gears and a neutral gear, a speed adjusting rod arranged on the speed change sliding gear set is connected with one end of a speed change lever, and the other end of the speed change lever is arranged at the rear end of the main frame;

a reverse sliding gear set is arranged on one transmission shaft in a transmission system in the gearbox and is arranged at different positions so that the rotating speeds of output shafts are opposite, a reverse gear arm arranged on the reverse sliding gear set is connected with a reverse handle through a soft wire or a rod, and the reverse handle is arranged at the rear end of the main frame;

an accelerator pull wire of the engine is connected with an accelerator handle arranged at the rear end of the main frame through a flexible wire or a pull rod; or,

when the power device is a motor, the power device further comprises a brake switch which is arranged at the rear end of the main frame and is positioned in front of or in front of and behind the brake anti-collision push-pull rod, and the brake switch is arranged on the track of the forward or forward and backward rotation of the brake anti-collision push-pull rod, so that the brake switch is pressed and contacted when the brake anti-collision push-pull rod rotates forwards to generate a braking effect, and the brake switch is connected with the motor state control end of the motor controller through a lead wire to stop the motor.

The connecting structure of the driving wheel and the main frame is as follows: the driving axle is arranged on the main frame and comprises an axle frame body, a differential mechanism is arranged on the axle frame body, a transmission shaft is connected with a power input end of the differential mechanism, two half shafts are connected with two power output ends of the differential mechanism, the transmission shaft is connected with the power device, two driving wheels are fixedly arranged on the two half shafts respectively, and the brake piece is arranged between the axle frame body and the driving wheels.

The lifting mechanism is a hydraulic device and comprises a hydraulic cylinder, a hydraulic pump and an oil tank, the hydraulic pump and the oil tank are arranged on the main frame, and the hydraulic pump is connected with a power device arranged on the main frame; the hydraulic cylinder, the hydraulic pump and the oil tank are connected into a loop through pipelines; control parts are arranged on a control valve on an upper liquid inlet and outlet pipe of the hydraulic cylinder and a power device on the hydraulic pump and are connected to the rear end of the main frame;

the two parts of the hydraulic cylinder which can move relatively are a hydraulic cylinder and a piston, and the connecting structure of the hydraulic cylinder, the main frame and the lifting frame is as follows:

one end of the hydraulic cylinder head is hinged to the main frame, and one end of the piston rod is hinged to the lifting frame; or one end of the cylinder head of the hydraulic cylinder is hinged on the main frame, one end of the piston rod is hinged with a lifting arm, one end of the lifting arm is hinged with the main frame, and the other end of the lifting arm is arranged in a longitudinal slide rail arranged on the lifting frame; or one end of the cylinder head of the hydraulic cylinder is hinged on the main frame, one end of the piston rod is hinged with a slide block, and the slide block is arranged in a longitudinal slide rail arranged on the lifting frame; or,

the lifting mechanism is an electric push rod, the two parts capable of moving relatively are a cylinder barrel and a screw rod which are in threaded connection with each other, and the ends of the cylinder barrel and the screw rod are respectively hinged with the main frame and the lifting frame; or one of the two lifting frames is hinged on the main frame, and the other lifting frame is arranged in a longitudinal slide rail arranged on the lifting frame; or,

the lifting mechanism is a folding lever type jack, the two parts capable of moving relatively are a folding piece and a lead screw, the lead screw penetrates through a pair of opposite cross points of the folding piece and is fixedly connected with one of the cross points and is in threaded connection with the other hinge point, two ends of the folding piece are respectively hinged on the main frame and the lifting frame, or one end of the folding piece is hinged on the main frame, and the other end of the folding piece is arranged in a longitudinal slide rail on the lifting frame.

The power device in the hydraulic device is the power device connected with the driving wheel, or is a power device arranged independently.

Specifically, when the power device is a motor, the power device connected with an active part of the two parts in the lifting mechanism is another motor, for example, the power device of a hydraulic pump in the hydraulic device is the same as a storage battery connected with a driving wheel motor, an output shaft of the motor is connected with the hydraulic pump to form a power unit of the hydraulic mechanism, and a loop formed by the motor and the storage battery further comprises electromagnetic distribution valves arranged on two liquid inlet and outlet pipes on the hydraulic cylinder; the two electromagnetic distribution valves are connected with a reset switch through lead wires, and the reset switch is arranged at the rear end of the main frame.

The connecting piece between the brake anticollision push-pull rod and the brake piece in the brake mechanism is a pull rod or a flexible wire, a support rod extending towards the front of the carrier is arranged on the rod body of the brake anticollision push-pull rod, and a hinge joint of the connecting piece and the rod body of the brake anticollision push-pull rod is arranged on the support rod.

The brake anti-collision push-pull rod comprises two push-pull branch rods, the outer ends of the two push-pull branch rods are hinged with the main frame, the hinged joints are arranged on the two push-pull branch rods, a gap is reserved between the two inner ends of the two push-pull branch rods, and a connecting piece is arranged in the gap and fixed on one of the push-pull branch rods and forms a separable connecting structure with the other push-pull branch rod.

The connector is a sleeve which is slidably sleeved and fixed on one of the push-pull branch rods, a return spring is arranged between the sleeve and the push-pull branch rod, the other end of the sleeve is sleeved on the other push-pull branch rod, and the clutch push rod and the push-pull branch rod fixed with the sleeve are arranged on the same side of the main frame in a matching manner; or,

the connector is a half sleeve which is longitudinally split and is buckled on the backward side wall of a push-pull branch rod for fixing, one end of the half sleeve extends out to be buckled and lapped with the other push-pull branch rod, and the clutch push rod and the push-pull branch rod fixed with the half sleeve are arranged on the same side of the main frame in a matching manner.

Under normal operating conditions, the two push-pull rods are integrated through the connecting sleeve, and the braking and anti-collision effects are achieved. When the vehicle turns, particularly when the road conditions are poor, such as uneven road conditions, the connecting sleeve can be pulled to one part of the brake anti-collision push-pull rod, so that the brake anti-collision push-pull rod is disconnected, and the corresponding push-pull rod is pushed to realize steering assistance. After the steering is finished, the connecting sleeve is loosened, and the brake anti-collision push-pull rod is integrated.

The latter scheme is more convenient to use, when the carrier moves straight, and when the brake is needed, the push-pull branch rod which is not fixedly provided with the half sleeve can be pulled by hand or the push-pull branch rod fixedly provided with the half sleeve can be pushed, so that the two push-pull branch rods rotate integrally. When the steering wheel needs to turn, the push-pull branch rods fixedly provided with the half sleeves are pulled or the push-pull branch rods not fixedly provided with the half sleeves are pushed, so that the two push-pull branch rods can respectively rotate, and the steering assistance is realized.

The front end of the lifting frame is provided with a fork, when the lifting frame is in the second position, the fork is grounded, the upward surface of the fork is vertical to the loading surface of the lifting frame, and the fork and the loading surface of the lifting frame form a loading part of the carrier; or,

and side plates are arranged on the periphery of the loading surface of the lifting frame to form a closed loading space, and the side plate at one grounded end and the lifting frame are in a movable connecting structure when the lifting frame is positioned at the second position.

The upper surface of the fork is perpendicular to the upper surface of the lifting frame. Preferably, the load carrying surface of the lift carriage is slightly forwardly inclined when in the second position. The anteversion angle is preferably 2-10 °

The fork and the lifting frame are of a fixed connecting structure; or,

the truck and the lifting frame are of a detachable fixed connection structure; or,

the fork and the lifting frame are of a movable connection structure, the fork is two movable forks which are respectively arranged at the two transverse side parts of the lifting frame, namely a slide rail is transversely arranged at the front end of the lifting frame, the movable fork is movably arranged in the slide rail, and a driving device is arranged between the movable fork and the lifting frame.

The drive means may be a jack mechanism of various configurations.

A preferred solution for the drive means for moving the forks is a hydraulic device,

for example, the fork comprises two movable forks which are respectively arranged at two transverse sides of the front end of the lifting frame, a sliding rail is transversely arranged at the front end of the lifting frame, the movable forks are movably arranged in the sliding rail, a hydraulic device is arranged between the movable forks and the lifting frame, a control valve is arranged on a liquid inlet pipe and a liquid outlet pipe of a hydraulic cylinder in the hydraulic device, and a lead is arranged on the control valve; the hydraulic device is connected with a hydraulic pump and a power mechanism for driving the hydraulic pump.

For example, a bidirectional hydraulic cylinder device is arranged between the lifting frame and the movable fork, wherein two pistons are arranged in the hydraulic cylinder, liquid inlet and outlet pipes are arranged on the cylinder wall between the two pistons and two ends of the hydraulic cylinder for connecting oil pipes, three liquid inlet and outlet pipes of the bidirectional hydraulic cylinder device are connected with control valves, the control valves are electric or manual, and the control valves are connected with control rods or control wires which are connected to the positions, close to handlebars, of the rear end of the main frame or are arranged on the handlebars.

And a balance wheel or two balance wheels arranged in a transverse row is also arranged between the front end of the lifting frame and the front wheel on the lower bottom surface of the lifting frame.

The balance wheel is a directional damping wheel.

The balance wheel lands when the lift carriage is between the first position and the second position and closer to the second position. The balance wheel has the advantages that when the lifting frame is erected, the gravity center of the vehicle moves forwards, the vehicle body is unstable, the tail part tends to tilt, and at the moment, the balance wheel lands in advance of the lifting frame, so that the risk that the vehicle tilts forwards and turns over can be effectively prevented. The balance wheel may be a shock absorbing directional wheel with no change in direction.

The structure of the gearbox is as follows: wherein a first transmission shaft, a second transmission shaft and a third transmission shaft are arranged in parallel,

the first transmission shaft is divided into two sections, one section is connected with an output shaft of an engine, the clutch is connected between the two sections, an elastic shifting fork is hinged on a box body of the gearbox and pressed against the clutch, a support rod is connected to the elastic shifting fork and extends out of the gearbox, one end of a clutch stay wire is connected to the support rod, and the other end of the clutch stay wire is connected to the clutch push rod; the first transmission shaft is provided with the variable-speed sliding gear set, namely a first gear and a second gear are arranged on the sliding sleeve, a space is reserved between the two gears, and the variable-speed sliding gear set has three positions on the first transmission shaft; the sliding sleeve is connected with the speed regulating rod; the other section of the first transmission shaft extends out of the gearbox to form a second output shaft which is connected with an input shaft of the hydraulic pump;

the second transmission shaft is fixedly provided with a third gear and a fourth gear, one end of the second transmission shaft extends out of the gearbox to form the first output shaft, the first output shaft is connected with the transmission shaft and then connected with the drive axle, and the third gear and the fourth gear are arranged at the following positions: the first transmission shaft and the second transmission shaft are respectively corresponding to two gears at two positions of the variable speed sliding gear set, and at the third position, no gear is meshed between the first transmission shaft and the second transmission shaft;

the reverse sliding gear set arranged on the third transmission shaft is that a fifth gear and a sixth gear are arranged on a sliding sleeve, and a return spring is arranged between the sliding sleeve and a shaft shoulder on the third transmission shaft, so that the reverse sliding gear set has two positions, namely a balance position and a non-balance position, and in the balance position, the third transmission shaft is meshed with other transmission shafts without gears; in the non-equilibrium position, two gears on the first transmission shaft are respectively meshed with one gear on the second transmission shaft; the sliding sleeve is connected with the reverse gear arm.

The gear lever on the first drive shaft has three gears:

the fast gear is that the first gear is meshed with the third gear;

a neutral position, said spacing corresponding to two of said gears on said second drive shaft;

a slow gear, namely the second gear is meshed with the fourth gear;

the reverse arm on the third shaft has two positions:

a first position: two of the gears thereon are in a vacant position;

and position two: the sixth gear is meshed with the second gear; the fifth gear is meshed with the fourth gear, and the return spring leaves the balance position; and/or the like, and/or,

one end of the first transmission shaft extends out of the gearbox and is connected with a power input shaft of a hydraulic pump in a hydraulic device in the lifting mechanism.

The power-driven hand-push loading and unloading carrier has the advantages that the power mechanism is arranged on the trolley which is small in size and can conveniently and flexibly enter and exit a railway wagon or a freight car carriage, so that the load carrying capacity of the power-driven hand-push loading and unloading carrier is increased by several times, the labor intensity of carriers is reduced, and the carrying efficiency is improved. According to the carrier provided by the invention, the lifting frame is structurally designed, a plurality of bagged goods can be orderly stacked on the lifting frame, and then the bagged goods are orderly stacked in a goods yard or a carriage, so that the bagged goods are firstly stacked one by one during multiple carrying, and the stacked goods are integrally moved onto the carrier through the fork and then are integrally put down during the second or multiple carrying. If the lifting frame is designed as a closed cargo space, the truck can also be used for carrying bulk goods. In addition, the trolley provided by the invention has a unique point in the mechanized transformation of the trolley. In a common motor vehicle, the clutch, the gear shifting and the reversing are all carried out by a driver in a cab, and the hands and feet are divided into work. A typical mechanical handling tool, such as a lifting machine, is also operated by a driver sitting in the cockpit to push a button. The operator of the carrier needs to hold the handle bar, so that the design is well designed for operating the running, speed changing, braking, backing and loading and unloading of the carrier. The brake clutch linkage device designed by the carrier and the reasonable arrangement of the accelerator, the speed change device and the direction change device on the handle bar can ensure that the carrier is convenient, free and safe to operate.

The invention is explained in detail below with reference to the figures and examples.

Drawings

FIG. 1 is a schematic side view of a power-driven, hand-propelled, loading/unloading truck powered by an engine according to the present invention.

Fig. 2 is a left side view schematic diagram of fig. 1.

Fig. 3 is a schematic structural view of a rear end of a main frame of the truck shown in fig. 1.

FIG. 4 is a schematic side view of the motor-powered hand truck of the present invention.

Fig. 5 is a left side view of the structure of fig. 4.

Fig. 6 is a schematic structural view of a rear end of a main frame of the truck shown in fig. 4.

Figure 7 is a cross-sectional schematic view of one side of a gearbox used in an engine-powered, hand-propelled, handling truck.

Fig. 8 is a left side view of the structure of fig. 7.

Fig. 9 is a partial schematic view of the side gearbox opposite to fig. 7.

FIG. 10 is a schematic sectional view of I-I of FIG. 8.

FIG. 11 is a structural diagram of a cross-section J-J of FIG. 9.

Fig. 12 is a schematic structural view of the break-away brake anti-collision push-pull rod.

Figure 13 is a side elevational schematic view of a power driven hand truck showing an alternative connection configuration of the lifting mechanism between the main frame and the lifting frame.

Fig. 14 is a left side view of the structure of fig. 13.

FIG. 15 is a schematic sectional view A-A of FIG. 14.

Detailed Description

Example 1:

as shown in fig. 1, 2 and 3, the hand truck for loading and unloading is a power-driven hand truck using an engine as power, which includes a main frame 1, a lifting frame 2, a lifting mechanism 3, and a power device 4:

the upper part of the main frame 1 is provided with a supporting surface, the lower part of the main frame is provided with a front wheel 11 and a rear wheel 12, one of the front wheel and the rear wheel is a driving wheel, the other one is a universal wheel, the number of the driving wheels is two, and the number of the universal wheels is one or two; in the present embodiment, the driving wheels are front wheels 11, and the universal wheels 12 are two. The two sides of the rear end of the main frame 1 are respectively provided with a handlebar 13a and a handlebar 13b which are used for being held by a person pushing the bicycle to control and adjust the direction of the bicycle; the drive wheels may also be rear wheels, while the front wheels are universal wheels. The driving wheel is connected with a power device 4 arranged on the main frame 1 through a transmission mechanism. The connecting structure can be as follows:

the power device comprises an engine 4, an oil tank connected with the engine 4 and a gearbox, and is fixedly arranged on the main frame 1; the output shaft of the engine 4 is connected to the input shaft of the gearbox, which has an output shaft. The front part of the main frame is fixedly provided with a drive axle 6, the drive axle 6 is in the prior art and comprises an axle frame body, two half shafts, a transmission shaft and a differential mechanism, the differential mechanism is arranged on the axle frame body, the power input end of the differential mechanism is connected with one end of the transmission shaft through a universal joint, and the other end of the transmission shaft is connected with the output shaft on the gearbox. Two drive wheels 11 are rotatably connected to the two axle shafts of the drive axle.

The main frame 1 is provided with two brake mechanisms corresponding to the driving wheels 11: a brake mechanism is arranged between the hub of the driving wheel and the bridge frame body, for example, a resettable brake pad is arranged on each half shaft, a brake drum is arranged on the hub of the driving wheel, a brake arm is arranged on the brake pad to form a brake piece, and a return spring can be arranged between the brake piece and the main frame.

A hinge shaft 14 is provided at the front ends of the two handlebars at the rear end of the main frame 1, both ends of a brake/collision prevention push-pull rod 15 are hinged to the rear end of the main frame 1 through the hinge shaft 14, the brake/collision prevention push-pull rod 15 extends in the transverse direction of the guided vehicle at the rear end of the main frame 1, and a support arm 15a extending at both ends of the brake/collision prevention push-pull rod 15 is bent toward the front of the guided vehicle, as shown in fig. 2 and 3.

When the brake anti-collision push-pull rod rotates forwards or backwards in two directions around a hinge shaft 14 which is hinged with the main frame 1, the brake anti-collision push-pull rod 15 drives the brake arms to move backwards through the connecting piece, so that the brake of the driving wheels can be implemented by rotating the brake anti-collision push-pull rod 15 forwards or backwards, and the use is very convenient and safe. The connector may be a brake lever 61 or a brake cord.

The lifting frame 2 is provided with a loading surface, is arranged on the main frame 1 and is hinged with the front part of the main frame 1, and the hinge structure is as follows: so that the lifting frame 2 rotates around the articulated shaft 21 between the following two positions: the first position is that the lifting frame 2 is placed on the supporting surface of the main frame 1, the loading surface is upward (as shown by the two-dot chain line in fig. 1), the second position is that the lifting frame 2 is erected in front of the front end of the main frame 1, the loading surface is erected, and the front end of the lifting frame 2 is grounded (as shown by the solid lifting frame in fig. 1).

A fork 22 is provided at the front end of the lifting frame 2, the fork 22 being grounded when the lifting frame 2 is in the second position, the upwardly facing surface of the fork 22 being arranged perpendicular to the upper surface of the lifting frame 2, i.e. the cargo plane, which in the second position is preferably slightly inclined forwards. The anteversion angle is preferably 2-10 °. The surface of the lifting frame 2 adjacent to the forks 22 constitutes the loading portion of the truck.

Side plates can be arranged around the loading surface of the lifting frame to form a closed loading space, and the side plate at one end which is grounded when the lifting frame is positioned at the second position and the lifting frame are in a movable connecting structure. Such lifting carriages may be used to carry bulk materials.

As shown in fig. 1, the lifting mechanism 3 may be a hydraulic device, wherein one end of a cylinder head of a hydraulic cylinder is hinged on the main frame 1, one end of a piston rod is hinged on a lifting arm 31, one end of the lifting arm 31 is hinged with the main frame 1, and the other end is arranged in a longitudinal slide rail 31a arranged at the front part of the lifting frame 2.

The hydraulic device also comprises a hydraulic pump and an oil tank which are arranged on the main frame 1 (not shown in the figure); the control valve on the liquid inlet and outlet pipe of the hydraulic cylinder is provided with a control rod which is connected to the rear end of the main frame 1. The hydraulic pump is connected to a power unit, which may be an engine connected to the drive wheels or another power unit. In the embodiment, the input shaft of the hydraulic pump is connected with the engine, specifically, connected with the transmission case connected with the engine to obtain power, and the specific connection structure is described in the structural description of the transmission case.

The connection structure of the lifting mechanism to the main frame 1 and the lifting frame 2 may also be a relatively simple structure. The hydraulic pump and the oil tank are also arranged on the main frame 1 in the same way, as shown in fig. 13 to 15, two V-shaped branches 20 are fixedly arranged on the lower part of the lifting frame 2 in the transverse direction, two separated ends of one side of each branch 20 are fixedly connected to the lifting frame 2, and one converged end of the other side of each branch 20 is hinged on the main frame 1. The hinge structure may be such that the two half shafts of the transaxle are used as hinge shafts, and the converging end of the sub-frame 20 is hinged to the half shafts (as shown in fig. 13). As shown in fig. 15, a connecting member 201 may be connected to each half shaft, the connecting member 201 is fixedly connected to the half shaft, and the sub-frame 20 is hinged to the connecting member 201 through a hinge shaft 202. The cylinder head of the hydraulic cylinder in the lifting mechanism 3 is hinged on the main frame 1, and the end of the piston rod is hinged on the lifting frame 2. The piston in the hydraulic cylinder moves linearly to push the lifting frame 2 to rotate around the hinge shaft 202 relative to the main frame. The connecting structure does not need to be provided with a longitudinal slide rail on the lifting frame, and the structure is simpler. In addition, compared with the structure shown in fig. 1, the hinge point of the hinge structure between the lifting frame and the main frame shown in fig. 13 and 15 is relatively closer to the back of the main frame, and the hinge point moves backwards, so that the lifting frame can be more stable in the rotating process relative to the main frame, and particularly when the lifting frame is filled with goods and is located at the vertical position, the rear part of the carrier is not easy to tilt, and the carrier is safer.

The lifting mechanism may also be a non-hydraulic device, for example, an electric screw lifting push rod, instead of the aforementioned hydraulic device. One end of the cylinder is hinged on the main frame 1, and one end of the screw rod is hinged on the lifting frame. For example, various mechanisms such as a rack jack and a screw (mechanical) jack may be used.

The hydraulic cylinder and the piston can be applied to various jacks with various connecting structures of the main frame and the lifting frame.

The power of the electric spiral lifting push rod and various jacks can be manual, namely a handle can be connected to the rotating piece, the lifting frame can be lifted manually, and the rotating piece can be directly connected with a motor or connected with an engine for driving the carrying vehicle to travel through a transmission mechanism. For example, a transmission shaft is provided on a transmission case connected to an engine and connected to the transmission case to obtain power.

The following are two examples of non-hydraulic lifting mechanisms:

the lifting mechanism is an electric push rod, the two parts capable of moving relatively are a cylinder barrel and a screw rod which are in threaded connection with each other, and the ends of the cylinder barrel and the screw rod are respectively hinged with the main frame and the lifting frame; or one of the two is hinged on the main frame, and the other is arranged in a longitudinal slide rail arranged on the lifting frame.

Fig. 7 to 11 and 3 show the structure of the transmission connected to the engine in the power device for driving the truck to travel in the present embodiment, and the transmission is further provided with a structure connected to the lifting mechanism for driving the lifting mechanism. The concrete structure is as follows:

a first transmission shaft 110, a second transmission shaft 120 and a third transmission shaft 130 are disposed in parallel in a case 100 of the transmission,

(1) the structure of the first transmission shaft 110:

the first transmission shaft 110 has two sections, one of which is connected to the output shaft of the engine. The clutch 111 is connected between the two sections, an elastic clutch fork 112 is hinged in the gearbox casing 100 and is pressed against the clutch 111 under the action of elastic force, a hinged shaft of the clutch fork 112 extends out of the gearbox casing 100, a clutch rocker 113 is connected on the hinged shaft, one end of a clutch pull wire 111a is connected on the clutch rocker 113, the other end of the clutch pull wire is connected with a clutch push rod 111b (shown in figure 3), and the clutch push rod 111b is hinged on the rear end of the main frame 1 and is close to the front end of the right handlebar 13 a. By moving the clutch push rod 111b, the first transmission shaft 110 is separated from the output shaft of the engine, the clutch rocker 111b is released, and the clutch 111 is engaged to transmit power by elastic force. The clutch push rod 111b is located in front of the brake anti-collision push-pull rod 15 on a locus where the brake anti-collision push-pull rod 15 rotates forward. When the brake anti-collision push-pull rod 15 is pushed forwards to brake, the clutch push rod 111b can be pushed and pushed to rotate around the hinge shaft, so that the clutch 111 can be disconnected by overcoming elastic resistance, and when the brake anti-collision push-pull rod 15 is released, the clutch push rod rotates around the hinge shaft under the action of elastic force, so that the clutch is combined again.

The clutch push rod and the brake anti-collision push-pull rod are in linkage design, so that the use safety of the carrier can be fully guaranteed. When the vehicle is braked, the clutch is simultaneously disconnected, according to the control structure of a common motor vehicle, when the vehicle is parked, the brake and the clutch handle are simultaneously stepped, and the hands and the feet are used for cooperative action, however, in the carrier, an operator holds the handle bars with two hands, if the vehicle runs into the reverse direction, the hands and the feet are used for two actions of immediately stopping the vehicle, and the carrier is difficult to realize under the condition that the carrier is basically operated by only two hands. The clutch push rod and the brake anti-collision push-pull rod linkage structure enables the brake anti-collision push-pull rod extending along the width direction of the main frame 1 to contact an operator firstly to enable the operator to rotate forwards, the brake arm is pulled to brake, meanwhile, the clutch push rod rotates due to the forward rotation of the brake anti-collision push-pull rod, the clutch can be disconnected, and the vehicle can stop immediately. During this process, the operator's hands may still hold the handlebars unreleased to hold the handlebar in place. After the vehicle stops, hands can be vacated, or the engine is stopped, or the brake anti-collision push-pull rod is opened and the clutch push rod is pushed to keep the vehicle in a stop state; the gear can also be adjusted so that the vehicle is in a neutral state.

One end of the first transmission shaft 110 extends out of the transmission case 100 to form a second output shaft, which is connected to an input shaft of the hydraulic pump to power the hydraulic pump in the lifting mechanism.

A variable-speed sliding gear set is arranged on the first transmission shaft 110, namely, a smaller first gear 110a and a larger second gear 110b are arranged on the sliding sleeve, a space is reserved between the two gears, and the variable-speed sliding gear set has three positions on the first transmission shaft; a speed adjusting lever 115 is connected to the sliding sleeve. The speed adjusting lever 115 is connected to a pull rod 115a, and the pull rod 115a extends to the rear end of the main frame 1 and is connected to a speed changing push-pull rod 115b provided in the middle of the rear end of the main frame 1. By operating the shift push-pull rod 115b, the shift slide gear set, which may be, is shifted between the three positions.

(2) Structure on the second drive shaft 120:

one end of the secondary drive shaft 120 extends out of the gearbox 100 to form said first output shaft which is connected to said drive shaft and in turn to said drive axle 6. A third gear 120a with a larger size and a fourth gear 120b with a smaller size are fixedly arranged on the second transmission shaft 120, and the positions of the third gear 120a and the fourth gear 120b are as follows: and at the third position of the variable-speed sliding gear, no gear is meshed between the first transmission shaft and the second transmission shaft to form a neutral position. By pushing and pulling the shift push-pull rod 115b, the second transmission shaft 120, i.e., the first output shaft, can be placed in the following three gear positions:

slow gear, i.e. the first gear meshes with the third gear;

the fast gear is that the second gear is meshed with the fourth gear;

thus, the traveling speed of the truck can be adjusted.

The second transmission shaft, i.e. the first output shaft, is connected to the drive axle via a transmission mechanism, i.e. a drive transmission shaft, i.e. a bevel gear 120c is arranged at the shaft end of the second transmission shaft extending out of the gearbox 100, which is engaged with a bevel gear (not shown) on a shaft on which two bevel gears are fixedly arranged, and another bevel gear on the shaft is engaged with a bevel gear (not shown) arranged on the drive transmission shaft, which then transmits the power to the drive axle and can provide a suitable transmission direction.

(3) Structure on the third drive shaft 130:

as shown in fig. 10, the reverse sliding gear set disposed on the third transmission shaft 130 includes a sliding sleeve, which is sleeved on the third transmission shaft 130, the sliding sleeve is disposed with a fifth gear 130a and a sixth gear 130b, and a return spring 130c is disposed between the sliding sleeve and a shoulder on the third transmission shaft, so that the reverse sliding gear set has two positions, a balance position and a non-balance position, and in the balance position, the third transmission shaft 130 is engaged with other transmission shafts without gears; in the non-equilibrium position, the two gears on the first transmission shaft are respectively meshed with one gear on the second transmission shaft, namely: the sixth gear 130b engages the second gear 110b on the first drive shaft 110, the fifth gear 130a engages the fourth gear 120b on the second drive shaft 120 and the return spring is out of balance 130 c. Therefore, the second transmission shaft, namely the first output shaft, can be reversely rotated, and reverse running can be implemented.

As shown in fig. 11, in the transmission case, a shaft 130d-1 is provided corresponding to the third transmission shaft 130, i.e. the reverse sliding gear set on the reverse shaft, to form a reverse rocker arm, a reverse shift fork 132 is provided on the reverse rocker arm, a reverse push plate 130d is provided on the third transmission shaft 130 to abut against the reverse sliding gear set, and the reverse shift fork abuts against the reverse push plate 130 d. The reverse arm is connected to one end of a reverse cable 130e, and the other end thereof is fixed to a reverse lever 130f (see fig. 3), and the reverse lever 130f is hinged to the left handle bar 13 b. When the vehicle is to be reversed, the shift push-pull rod 115b is first placed in the neutral position, and then the reverse wrench 130f is operated.

As shown in fig. 3, the throttle cable of the engine 4 is connected to a throttle grip 41a provided at the rear end of the main frame via a cord 41.

An ignition switch is arranged on the engine and connected with a starting motor, the starting motor is connected with a storage battery arranged on the main frame, or the engine is connected with a starting rocker arm and is started by hand cranking.

The first transmission shaft 110, i.e. the second output shaft, is connected to an input shaft of the hydraulic pump in the lifting mechanism, the hydraulic pump is connected to a hydraulic cylinder, liquid inlet and outlet pipes on the hydraulic cylinder are connected to an oil pipe, the liquid inlet and outlet pipes are respectively connected to a control valve, and a control part of the control valve is connected to a control rod 31. In a specific example, a hydraulic distribution valve may be provided in the output oil line of the hydraulic pump, wherein the distribution rod is connected to the control rod 31. As shown in fig. 3, the control rod 31 extends to the frame at the rear end of the main frame and is connected to a driving member, which may be in a manual or foot-operated driving manner, and as a specific example, as shown in fig. 3, the driving member is two pedals 31a and 31b arranged on the control rod 31, and by pressing the pedals in different directions, the control rod 31 can be rotated in different directions, so as to realize the actions of two hydraulic distribution valves, and thus realize the lifting, stopping and falling of the lifting frame. The driving piece can also be a button, and the action of lifting the vehicle frame is implemented by adjusting the button.

The brake anti-collision push-pull rod 15 can also be divided into two push-pull sub-rods 151 and 152, the outer ends of the two push-pull sub-rods are hinged with the main frame 1 as described above, a gap is left between the two inner ends, and a connecting piece is arranged in the gap and fixed on one of the push-pull sub-rods and forms a separable connecting structure with the other push-pull sub-rod.

The combining part can be a sleeve, one end of the combining part can be slidably sleeved and fixed on one push-pull branch rod, and a return spring is arranged between the combining part and the push-pull branch rod, so that the sleeve can slide on the push-pull branch rod and can reset. The other end of the pipe sleeve is sleeved on the other push-pull branch rod. The sleeve pipe resists the sliding of the return spring and can be separated from the other push-pull branch rod.

Under the normal working condition, the two push-pull rods are integrated through the sleeve, and the braking and anti-collision effects are achieved. When the vehicle turns, particularly when the road conditions are poor, such as uneven road conditions, the sleeve can be pulled to one of the push-pull branch rods against the return spring and is separated from the other push-pull branch rod, so that the brake anti-collision push-pull rod is disconnected from the middle, the corresponding push-pull branch rod is pushed to brake the side driving wheel, and the vehicle can be steered and assisted to realize easy steering. After the steering is finished, the push-pull separation rod is loosened, the single-side brake is released, then the sleeve is loosened, the sleeve is sleeved with the push-pull rod on the separated side again, and the brake anti-collision push-pull rod is integrated. And correspondingly, the clutch push rod and the push-pull branch rod fixed with the sleeve are arranged on the same side of the main frame.

The connecting member may also be a half sleeve 153 which is longitudinally cut, as shown in fig. 12, and is fastened to the push-pull branch rod on the same side as the clutch push rod, in this embodiment, it is fastened to the rearward side wall of one push-pull branch rod 151 on the right side, and one end of the half sleeve extends out to be fastened and overlapped with the other push-pull branch rod 152. The length of the right push-pull branch 151 is preferably longer than the left push-pull branch.

In use, if the driver is going forward and backward normally, he holds the handlebar, and when he wants to brake and stop, he pushes the right push-pull rod 151 forward and drives the clutch push rod 111b to stop the vehicle. When the vehicle runs into a reverse direction and touches an operator, the right push-pull branch rod 151 is longer, so that the vehicle can touch the right push-pull branch rod 151 generally, brake clutch linkage is realized, and the vehicle can also stop. If the brake is required to decelerate during travel without disengaging the clutch, the left push-pull separator bar 152 is pulled backwards. When the vehicle is going to turn to the right, the right push-pull branch rod 151 is pulled, and when the vehicle is going to turn to the left, the left push-pull branch rod 152 is pushed, so that the power-assisted steering is realized.

In order to prevent the lift truck from being unbalanced when the lift truck is lifted, as shown in fig. 1, a balance wheel 23 is further provided between the front end of the lift truck 2 and the front wheel 11 on the lower bottom surface thereof. And a damping spring is arranged between the balance wheel 23 and the lifting frame. Which is a fixed direction fixed wheel that lands when the lifting frame 2 is erected near the vertical position and that floats above the ground when the front end of the lifting frame 2 lands.

The fork and the lifting frame may be a fixed connection structure. Or a detachable fixed connecting structure.

An optimized scheme of the pallet fork is as follows: the fork is two movable forks respectively arranged at the two lateral sides of the lifting frame, namely a slide rail is transversely arranged at the front end of the lifting frame, the movable forks are movably arranged in the slide rail, and a driving device is arranged between the movable forks and the lifting frame.

The drive means may be a jack mechanism of various configurations.

One preferable scheme of the driving device for driving the movable fork is a hydraulic device, wherein one end of a hydraulic cylinder is connected to the lifting frame, the other end of the hydraulic cylinder is connected to the movable fork, and the two movable forks can be separated or folded by the action of the hydraulic cylinder; the hydraulic pump in the hydraulic device is connected with the power mechanism 4, or is connected with an independent power mechanism to form an independent hydraulic system, and preferably, the hydraulic device is connected with a hydraulic loop of a hydraulic device of the lifting mechanism 3 driven by the power mechanism 4. A control valve is arranged in a hydraulic system of the movable fork, and a lead is arranged on the control valve and connected to the rear end of the main frame. The control valve may also be a solenoid dispensing valve.

The hydraulic device arranged between the lifting frame and the movable fork can be a bidirectional hydraulic cylinder device, wherein two pistons are arranged in the hydraulic cylinder, liquid inlet and outlet pipes are arranged on the cylinder wall between the two pistons and at the two ends of the hydraulic cylinder and are connected with oil pipes, a control valve is arranged on the liquid inlet and outlet pipes of the bidirectional hydraulic cylinder device, the control valve is electric or manual, and is connected with a control rod or a control wire which is connected to the position, close to a handlebar, of the rear end of the main frame.

The power mechanism of the driving device can be a motor connected with the driving device or connected with the power device driving the carrier to move through a transmission mechanism.

The transversely movable telescopic fork can enable the fork to be inserted under the goods from two sides of the bagged goods, so that the goods can be effectively protected from being damaged by the fork in the loading and unloading process and the breakage rate of the goods can be reduced compared with the fork inserted under the goods from the middle. The goods stacking device can directly fork stacked goods placed in a goods yard through the telescopic fork at one time, so that the labor force is reduced, and the labor efficiency is improved.

Example 2:

in this embodiment, most of the structure is the same as that of embodiment 1, except that the power plant uses a motor instead of the engine.

As shown in fig. 4, 5 and 6, the power device includes a motor 7, a motor controller 71, a three-state switch 71b, a speed-regulating handle 71a and a battery 70, the motor controller 71 and the motor 7 are fixedly arranged on the main frame 1, the three-state switch 71b is arranged at the rear end of the main frame 1 near the right-side handle 13a, and the speed-regulating handle 71a is arranged on the handle 13a at the rear end of the main frame 1; two ends of the three-state switch 71b are connected with a motor state control end of the motor controller 71 through a lead 71 b' to control the forward rotation, stop and reverse rotation of the motor; the signal output end of the speed regulating handle 71a is connected with the speed regulating port of the motor controller 71 through a wire 71 a' to control the rotating speed of the motor.

A brake switch may be provided at the rear end of the main frame 1 on the forward rotation trajectory of the brake anti-collision push-pull rod 15 (not shown in the figure), so that the forward rotation of the brake anti-collision push-pull rod 15 can knock down the brake switch. The two ends of the brake switch are connected with the brake switch port on the motor controller 71 through wires. The carrier is backed to the pusher, and the brake switch is pressed by the brake anti-collision push-pull rod, so that the motor 7 connected with the driving wheel stops rotating, and the vehicle is braked. If the brake switch is not provided, when the bicycle backs, the speed regulating handle is loosened, and the motor can also be stopped. For safety reasons, the brake switch can also be arranged on the main frame 1 in front of and behind the brake anti-collision push-pull rod 15, so that the brake switch can be touched by the brake anti-collision push-pull rod when the brake anti-collision push-pull rod rotates forwards or backwards.

The brake switch is connected with a motor state control end of the motor controller through a lead.

The controller 71 and the motor 7 are, in this embodiment, a Datai third-generation brushless motor, a brushless differential motor and a controller thereof, which are manufactured by Datai electromechanical company, Inc. of Taizhou city, and for the existing mature technology, the detailed control circuit is not described again. The main switch 71c of the circuit is provided on the frame at the rear end of the main frame 1.

The connection structure of the motor 70 and the drive axle may be that a chain wheel is respectively arranged on the output shaft of the motor 70 and the transmission shaft connected with the drive axle, and a chain is arranged on the two chain wheels.

In this embodiment, the lifting mechanism between the lifting frame 2 and the main frame 1 is a hydraulic device 3 as shown in fig. 4, wherein the hydraulic pump is connected with an independent motor, the independent motor has the same connected battery jar as the battery jar connected with the driving wheel motor, the output shaft of the motor is connected with the hydraulic pump to form a power unit of the hydraulic mechanism, and the loop formed by the motor and the battery jar further comprises electromagnetic distributing valves arranged on two liquid inlet and outlet pipes on the hydraulic cylinder; the two electromagnetic distribution valves are connected with a reset switch through lead wires, and the reset switch is arranged at the rear end of the main frame. Specifically, the motor is connected to the battery 70. The hydraulic device 3 is connected with an electromagnetic distribution valve, a connecting line 74a of the electromagnetic distribution valve is connected with a control switch 74 also called a forward and reverse switch 74, and the forward and reverse switch 74 is fixed at the rear end of the main frame 1.

The hydraulic device of the lifting mechanism can be replaced by other linear motion mechanisms, such as various jacks and the like, as in embodiment 1.

The power device connected with the lifting mechanism can be independently provided with a motor and can also be shared with a motor for driving the carrier to move. A transmission mechanism is connected between the two.

A specific example common to the motor connected to the transaxle may be: the output shaft of the motor 7 is provided with a sliding gear set, in addition, the main frame is provided with two shafts, the two shafts are respectively provided with a gear, the sliding gear set is moved to be respectively meshed with the gears on the two shafts, and the two shafts are respectively connected with a transmission shaft connected with a drive axle and a transmission mechanism connected with a lifting mechanism. The sliding gear set is provided with an operating lever which is connected to the rear end of the main frame through a connecting wire or a connecting rod so as to be convenient to operate. Thus, two functions of driving the carrier to walk and lifting the frame by using one motor are realized. During driving, the sliding gear set moves to a position where it is engaged with the drive shaft. The lifting mechanism does not act at this moment. When the lifting frame is lifted, the sliding gear set moves to the position combined with the lifting mechanism, and the vehicle does not move.

The fork on the lifting frame can be fixed or movable, and the control valve on the liquid inlet and outlet pipe on the hydraulic device between the fork and the lifting frame can also be an electromagnetic distribution valve, and the control switch of the electromagnetic distribution valve is connected to the rear end of the main frame (not shown in the figure).

The fork 22' of the lift carriage 2 is of a fixed construction in this embodiment.

As the carrier taking the motor as power, the operation is more convenient and safer, the speed change and the power failure are arranged on one speed change handle, and the vehicle can be parked by only loosening the speed change handle. The brake can be pulled or pushed by a hand which loosens one handlebar, and the brake anti-collision push-pull rod can also be pushed by a body, so that the brake is very convenient.

In a word, the invention is suitable for the carrier used in the loading and unloading field of the van-type train or the container freight car, because of the power drive, the labor intensity is lightened, because of the hand control, the flexibility of the manpower carrier is kept. The main frame is a structural member which is connected with the whole vehicle and bears various forces, and a drive axle on the main frame and a drive wheel and a universal wheel which are connected with the drive axle support the weight of the carrier and enable the carrier to walk. The lifting frame can directly load goods and has the functions of stacking, turning and adjusting the gravity center. Which fulfill its function by means of a lifting mechanism. The fork on the lifting frame can be a transversely movable structure besides a fixed structure. If the fixed side plates are attached to the lifting frame to form a closed space, bulk goods can be transported.

Claims

1. A power-driven hand-push loading and unloading carrier is characterized by comprising a main frame, a brake anti-collision push-pull rod, a lifting frame and a lifting mechanism;

the connecting structure of the driving wheel and the main frame is as follows: the main frame is provided with a driving axle which comprises an axle frame body, the axle frame body is provided with a differential mechanism, a transmission shaft is connected with a power input end of the differential mechanism, two half shafts are connected with two power output ends of the differential mechanism, the transmission shaft is connected with the power device, two driving wheels are fixedly arranged on the two half shafts respectively, and a brake piece is arranged between the axle frame body and the driving wheels;

the lifting mechanism comprises two parts which are connected with each other and can move relatively, wherein one part is arranged on the main frame, the other part is connected with the lifting frame to enable the lifting frame to rotate between the two positions around the hinge shaft, and the lifting mechanism is connected with a lifting power device or a manual mechanism to drive the two parts to move relatively;

the power device comprises a motor and a storage battery connected with the motor, and the motor and the storage battery are fixedly arranged on the main frame; an output shaft of the motor is connected with the two driving wheels through a transmission mechanism;

when the power device is a motor, the power device comprises the motor, a motor controller, a three-state switch, a speed regulation handle and a storage battery, wherein the storage battery, the motor controller and the motor are fixedly arranged on the main frame, the three-state switch is arranged at the rear end of the main frame, and the speed regulation handle is arranged on the handle at the rear end of the main frame; two ends of the three-state switch are connected with a motor state control end of the motor controller through a lead to control the forward rotation, stop and reverse rotation of the motor; the signal output end of the speed regulating handle is connected with a speed regulating port of the motor controller through a wire to control the rotating speed of the motor;

2. The powered, hand truck of claim 1, wherein the lifting mechanism is a hydraulic device including a hydraulic cylinder, a hydraulic pump and an oil tank, the hydraulic pump and oil tank being disposed on the main frame, the hydraulic pump being connected to a power unit disposed on the main frame; the hydraulic cylinder, the hydraulic pump and the oil tank are connected into a loop through pipelines; control parts are arranged on a control valve on an upper liquid inlet and outlet pipe of the hydraulic cylinder and a power device on the hydraulic pump and are connected to the rear end of the main frame;

the two parts of the hydraulic cylinder which can move relatively are a cylinder head and a piston of the hydraulic cylinder, and the connecting structure of the hydraulic cylinder, the main frame and the lifting frame is as follows:

one end of the cylinder head of the hydraulic cylinder is hinged to the main frame, and one end of a piston rod on the piston is hinged to the lifting frame; or one end of the cylinder head of the hydraulic cylinder is hinged on the main frame, one end of a piston rod on the piston is hinged with a lifting arm, one end of the lifting arm is hinged with the main frame, and the other end of the lifting arm is arranged in a longitudinal slide rail arranged on the lifting frame; or one end of the cylinder head of the hydraulic cylinder is hinged on the main frame, one end of a piston rod on the piston is hinged with a slide block, and the slide block is arranged in a longitudinal slide rail arranged on the lifting frame; or,

the lifting mechanism is a folding lever type jack, the two parts capable of moving relatively are a folding piece and a lead screw, the lead screw penetrates through a pair of opposite hinged points of the folding piece and is fixedly connected with one hinged point and is in screwed connection with the other hinged point, two ends of the folding piece are respectively hinged on the main frame and the lifting frame, or one end of the folding piece is hinged on the main frame, and the other end of the folding piece is arranged in a longitudinal slide rail on the lifting frame.

3. The powered hand truck of claim 1, wherein the connection between the brake bump prevention push-pull rod and the brake member of the brake mechanism is a pull rod or a flexible wire, a rod body of the brake bump prevention push-pull rod is provided with a support rod extending forward of the truck, and a hinge point of the connection with the rod body of the brake bump prevention push-pull rod is provided on the support rod.

4. The power-driven hand truck according to claim 1 or 3, wherein said brake crash-proof push-pull rod comprises two push-pull sub-rods, the outer ends of the two push-pull sub-rods are hinged to said main frame, and each of the two push-pull sub-rods is provided with said hinge point, a gap is left between the two inner ends of the two push-pull sub-rods, and a joint member is provided at the gap and fixed to one of the push-pull sub-rods and forms a separable connection structure with the other push-pull sub-rod.

5. The power-driven hand-propelled loading and unloading truck as claimed in claim 4, wherein the engaging member is a sleeve slidably fitted and fixed to one of the push-pull branch rods, and a return spring is provided between the sleeve and the push-pull branch rod, and the other end of the sleeve is fitted and fixed to the other push-pull branch rod, and in cooperation therewith, when the power unit is an engine, a clutch is provided in a transmission mechanism between an output shaft of the engine and the driving wheel, a clutch push rod is hinged to a rear end of the main frame, and is connected to a clutch arm on the clutch through a connecting member, and the clutch push rod and the push-pull branch rod to which the sleeve is fixed are on the same side of the main frame; or,

6. The powered hand truck of claim 1, wherein a fork is provided at the front end of the lift frame, the fork resting on the ground when the lift frame is in the second position, the upwardly facing surface of the fork being perpendicular to the loading surface of the lift frame, the fork and the loading surface of the lift frame forming the loading portion of the truck; or,

and side plates are arranged around the loading surface of the lifting frame to form a closed loading space, and the side plate at one end, which is landed when the lifting frame is positioned at the second position, and the lifting frame are in a movable connecting structure.

7. The powered, hand truck of claim 6, wherein the fork and the lift frame are a fixed connection; or,

the fork and the lifting frame are of a detachable fixed connection structure; or,