CN108726445B - Simple electric pallet truck - Google Patents
Simple electric pallet truck Download PDFInfo
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- CN108726445B CN108726445B CN201810783494.3A CN201810783494A CN108726445B CN 108726445 B CN108726445 B CN 108726445B CN 201810783494 A CN201810783494 A CN 201810783494A CN 108726445 B CN108726445 B CN 108726445B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07568—Steering arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/0759—Details of operating station, e.g. seats, levers, operator platforms, cabin suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/24—Electrical devices or systems
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Handcart (AREA)
Abstract
The invention discloses a simple electric pallet truck which comprises a truck body system, a driving system, a steering system, a lifting connecting rod assembly, a hydraulic system and an electric system, wherein the driving system comprises a driving wheel arranged at the lower part of the truck body system, the upper end of the steering system is bent and extended above the truck body system, the lower end of the steering system is fixedly connected with the driving system or a hydraulic cylinder, the lifting connecting rod assembly is arranged at the rear side of the truck body system and is rotationally connected with the truck body system, a pedal assembly is connected at the front side of the truck body system in a side-by-side conversion way, a driving element is arranged between a front truck frame of the truck body system and the pedal assembly, the driving element enables the pedal assembly to be positioned in a folded state of being upwards abutted against the front truck frame, and when the pedal is unfolded, a buffer element plays a role in buffering. The invention can effectively reduce the labor load of operators, and the pedal has good buffering and damping effects, thereby improving the comfort level of the operators when the operators stand; the vehicle body is small and can be suitable for operation in narrow space.
Description
Technical Field
The invention relates to the technical field of freight devices, in particular to a simple electric pallet truck.
Background
In storage and logistics places, the pallet truck capable of moving and carrying goods is quite common in application, the pallet truck is divided into manual and electric, the pallet truck generally comprises a front frame and a rear frame, a driving wheel is arranged at the lower part of the front frame, left and right forks are arranged at the rear side of the rear frame, lifting connecting rod assemblies are arranged at the lower sides of the left and right forks, and rollers are arranged at the rear ends of the lifting connecting rod assemblies. The manual carrier has the advantages of simple structure and small size, but has the defects of high working strength and low working efficiency. The electric carrier is driven by the motor, so that the movement of the carrier is realized, the working intensity of operators can be greatly reduced, the improvement of the working efficiency is facilitated, and the electric carrier has a wider market.
Among all electric pallet trucks, there is a light-duty all electric pallet truck, and this kind of motorcycle type compact structure, the automobile body is simplified, and the transport is nimble, and it is convenient to maintain, is evolved from manual carrier, and its cost is especially lower than conventional electric pallet truck very much. Because of small size and low price, the vehicle type is favored by numerous small and medium-sized enterprises and individual operators. However, the conventional light-weight electric pallet trucks are operated by walking, and it is difficult to improve the work efficiency for operators who frequently use the electric pallet trucks for a long time.
Disclosure of Invention
The invention aims to solve the problems that the existing electric pallet truck with pedals is large in external dimension and cannot meet the requirement of narrow space operation, and provides a simple electric pallet truck which is convenient for an operator to stand when standing driving operation is performed, so that the working intensity of the operator is reduced, and the requirement of the operator on the narrow space operation can be met.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a simple and easy electronic tray carrier, includes automobile body system, actuating system, steering system, plays to rise link assembly, hydraulic system and electrical system are arranged in respectively and are connected at automobile body system inside and with actuating system, actuating system is including setting up the drive wheel by motor drive in automobile body system lower part, steering system's upper end crookedly extends in automobile body system's top, steering system's lower extreme and actuating system or hydraulic cylinder fixed connection, it is connected at automobile body system's rear side and with automobile body system rotation to play to rise link assembly setting, turns over at automobile body system's front and is connected with a footboard subassembly, is equipped with driving element between automobile body system's preceding frame and footboard subassembly, driving element makes the footboard subassembly position and upwards rotate to the folded condition of leaning on preceding frame, be equipped with a buffer element in the footboard subassembly.
The existing electric pallet truck is limited by a light structure form, and a pedal is not arranged normally, so that the working strength of operators is high. The invention is characterized in that a pedal assembly is connected to the front side of the vehicle body system in a tilting manner, and the pedal assembly is arranged on the vehicle body system in a vertically rotatable manner, and a driving element is arranged between the front frame of the vehicle body system and the pedal assembly, so that the pedal always maintains the upward tilting force. Thus, when the Chu Diandong pallet truck is stored, the driving element can push the pedal assembly to rotate upwards to a folded state vertically abutting against the front frame, and the overall size of the electric pallet truck can be remarkably reduced. That is, the present invention enables an operator to stand on the pedal assembly to operate the electric pallet jack, thereby remarkably reducing the working strength thereof, and enables the electric pallet jack to operate in a narrow space. In particular, the pedal assembly is provided with the buffer element which can be made of polyurethane and can form elastic support for the pedal assembly in a horizontal state, so that a good elastic shock absorbing effect is formed for operators standing on the pedal.
Preferably, the pedal assembly comprises a pedal seat connected to the front frame and a pedal connected to the pedal seat, a left hinge rod and a right hinge rod are arranged on the lower side of the pedal, the end parts of the hinge rods are hinged to a hinge bracket in the pedal seat, one end of the driving element is rotationally connected with the front frame, the other end of the driving element is rotationally connected with the pedal, and the buffering element is fixed on the pedal seat and supported below the hinge rods.
When the pedal rotates up and down, the hinging rod can rotate up and down in the rotating groove of the pedal seat. In particular, the buffer element is fixed on the pedal seat and supported below the hinging rod, so that a good shock absorbing effect can be formed on the pedal.
Preferably, the buffer element is an elastic limiting block which is arranged at the bottom of the pedal seat and corresponds to the position of the hinge rod and can provide elastic restoring force, the elastic limiting block is made of polyurethane, and when the pedal assembly is turned forwards to a horizontal state, the hinge rod abuts against the corresponding elastic limiting block.
The elastic limiting block made of polyurethane has good pressure resistance, and can still keep good resilience force when the pedal is repeatedly extruded, so that elastic support is formed for the pedal assembly in a horizontal state.
Preferably, the driving element is a gas spring, one end of the gas spring is hinged on the pedal seat, the other end of the gas spring is hinged on the lower side of the pedal, and the gas spring enables the pedal to be kept in an upward overturning state against gravity.
When the electric pallet truck is required to be operated, the pedal can be rotated downwards to a horizontal state by overcoming the elasticity of the gas spring by the self weight of an operator; when the electric pallet truck is required to be stored, the gas spring can automatically push the pedals to rotate upwards, so that the pedal group can be automatically reset to a folded state.
Preferably, the rear end of the lifting connecting rod assembly is provided with a follow-up roller assembly, and the rear end of the lifting connecting rod assembly is rotationally connected with the middle part of the connecting plate in the follow-up roller assembly, so that the follow-up roller of the follow-up roller assembly can swing up and down.
The follow-up roller assemblies form a teeterboard structure, so that the front follow-up roller and the rear follow-up roller in the follow-up roller assemblies can automatically adapt to the inclination and the unevenness of the bottom surface, the two follow-up rollers are ensured to be always in uniform contact with the ground, and the bearing pressure of each follow-up roller is further reduced.
Preferably, the vehicle body system comprises a front frame and a rear frame, a lifting oil cylinder is vertically arranged in the front frame, the hydraulic system comprises a power unit which is arranged in the rear frame and used for driving the lifting oil cylinder, the lower end of a cylinder barrel of the lifting oil cylinder is fixedly connected with the upper end of the driving system, so that the cylinder barrel can rotate along with the driving system, the upper end of a piston rod of the lifting oil cylinder is rotationally connected with the upper end of the rear frame, and the steering system is connected to the side surface of the cylinder barrel at the lower part of the lifting oil cylinder.
The power unit can drive the lifting oil cylinder to drive the rear frame to ascend, and meanwhile, the steering system can conveniently drive the driving wheel to rotate through the lifting oil cylinder, so that the steering of the electric pallet truck is realized. Because the lifting oil cylinder is directly connected to the upper part of the driving connecting seat, the rotation axes of the driving connecting seat and the driving wheel are coaxial with the axis of the lifting oil cylinder, and further, arc-shaped swing friction between the driving wheel and the ground during steering can be avoided.
Preferably, a rotating shaft is arranged at the upper end of the driving system, a rotating hole is arranged on the front frame, and the rotating shaft is rotatably connected with the rotating hole.
Preferably, the steering system comprises a steering handle and a connecting bracket, wherein the lower end of the connecting bracket is fixedly connected with the driving system or the hydraulic cylinder, the upper end of the connecting bracket is bent and extends to the upper part of the vehicle body system, the lower end of the steering handle is rotatably connected with the upper end of the connecting bracket, and the rotating connecting point is positioned above the vehicle body system.
When the connecting bracket is rotated through the control handle, the driving system or the hydraulic oil cylinder can be driven to rotate, and then the driving wheel is driven to rotate so as to control the driving direction. The upper end of the connecting bracket is bent and extends to the upper part of the vehicle body system, and the rotary connecting point of the lower end of the control handle and the upper end of the connecting bracket is positioned above the vehicle body system, so that the structure is further compact, and the control by a user is facilitated.
As an alternative scheme of the scheme, the upper side of the pedal is provided with a left control pedal and a right control pedal, the rear side of the control pedal is provided with a transverse spline sleeve, the rear side of the pedal is provided with a hydraulic cylinder sleeve which is transversely arranged and has a working cavity communicated with two ends, two ends of the working cavity of the hydraulic cylinder sleeve are respectively provided with extrusion plungers, the left and right ends of the pedal, which are respectively provided with screw sleeves, the inner threads of the screw sleeves at the left and right ends are opposite in rotation direction, the screw sleeves are internally threaded with driving screws, one end of each driving screw is coaxially connected with the extrusion plungers at the corresponding side, the other end of each driving screw is in spline connection with the spline sleeve of the control pedal at the corresponding side, a reset spring is arranged between the control pedal and the pedal, the middle outer side of the hydraulic cylinder sleeve is provided with an oil outlet and an oil inlet, the oil outlet is communicated with the working cavity of a lifting cylinder through a pipeline provided with a one-way valve, the oil inlet is communicated with the oil tank through a pipeline provided with the one-way valve, and the working cavity of the lifting cylinder is communicated with the oil tank through a pipeline provided with the control valve, when an operator treads the control pedal downwards, the pedal is connected with the screw sleeve at the left and right end, one end of the screw sleeve is coaxially connected with the extrusion plungers at the corresponding side, one end of the screw sleeve, one end of the driving screw is correspondingly to the corresponding driving screw and the lifting cylinder, the lifting cylinder is driven to move forwards through the hydraulic oil through the lifting cylinder, and the lifting cylinder; when the feet of an operator lift up, the return spring drives the control pedal to rotate upwards, so that the drive screw is driven to rotate reversely, the drive screw pulls the extrusion plunger to move backwards axially, the hydraulic cylinder sleeve working cavity forms negative pressure, and hydraulic oil in the oil tank enters the hydraulic cylinder sleeve working cavity through the oil inlet.
Preferably, the front side of the rear frame is provided with a hinging block, a spherical cavity is arranged in the hinging block, the lower side surface of the hinging block is provided with an insertion round hole which vertically extends upwards and penetrates through the spherical cavity, the center of the spherical cavity is positioned on the axis of the insertion round hole, a hinging disc is arranged in the spherical cavity, the circumferential surface of the hinging disc is a spherical surface which is matched in the spherical cavity, the upper end of a piston rod of the lifting cylinder is inserted into an inserting hole in the center of the hinging disc, the lower side surface of the hinging block is provided with a rectangular mounting hole with the width larger than the height of the hinging disc, the side walls of the rectangular mounting hole extending upwards to the two width directions are tangent with the spherical cavity, and the axis of the rectangular mounting hole is coaxial with the axis of the insertion round hole.
The invention has the following beneficial effects: compared with the existing light electric pallet truck, the invention can effectively reduce the labor load of operators, and the pedals have good buffering and damping effects, thereby improving the comfort level of the operators when standing; the vehicle body is small, and can be suitable for operation in a narrow space; in addition, the invention is improved on the basis of the light electric pallet truck, and compared with the existing standing driving type electric pallet truck, the invention has the advantages of low cost and suitability for low-cost market popularization.
Drawings
Fig. 1 is a schematic view of a pedal assembly of the present invention in a horizontal position.
Fig. 2 is a schematic view of an exploded construction of the present invention.
Fig. 3 is a side view of the pedal assembly.
FIG. 4 is a schematic diagram of the connection structure of the pedal assembly to the control pedal.
Fig. 5 is a schematic diagram of a connection structure of a lifting cylinder and a rear frame.
In the figure: 1. the front frame 11, the driving wheel 12, the elastic limiting block 13, the rotating groove 14, the driving connecting seat 15, the steering system 2, the rear frame 21, the fork 211, the reinforcing rib 22, the hinging block 221, the spherical cavity 222, the inserting round hole 223, the rectangular mounting hole 3, the lifting connecting rod assembly 31, the L-shaped connecting rod 32, the lifting connecting rod 33, the follower wheel fork 34, the synchronous cross rod 4, the follower roller assembly 41, the follower roller 42, the fork 5, the pedal assembly 51, the hinging rod 511, the straight rod 512, the bent rod 52, the control pedal 521, the spline housing 53, the hydraulic cylinder sleeve 531, the oil inlet 532, the oil outlet 54, the screw housing 55, the extrusion plunger 56, the driving screw 6, the gas spring 7, the lifting cylinder 8, the hinging disc 9 and the storage battery.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
As shown in fig. 1 and 2, a simple electric pallet truck comprises a body system consisting of a front frame 1 and a rear frame 2, a driving system, a steering system 15, a lifting connecting rod assembly 3, a hydraulic system and an electric system comprising a storage battery 9, wherein the hydraulic system and the electric system are respectively arranged in the body system and connected with the driving system so as to provide power for the driving system and control the action of the driving system. The driving system comprises a driving wheel 11 which is arranged at the lower part of the front frame and driven by a motor, the lower end of the steering system is fixedly connected with the driving system or the hydraulic system, and the lifting connecting rod assembly is arranged at the rear side of the rear frame of the vehicle body system and is rotationally connected with the rear frame. The rear frame comprises a left fork 21 and a right fork 21 which are arranged at the rear side of the rear frame, lifting connecting rod assemblies are arranged at the lower side of each fork, and a follow-up roller assembly 4 comprising a follow-up roller is arranged at the rear end of each lifting connecting rod assembly. Like this, when lifting the link assembly jack-up fork to jack-up carries the tray of goods, the motor makes the drive wheel rotate, and the follow-up gyro wheel in the follow-up gyro wheel subassembly is driven roll promptly, and whole electronic tray carrier can advance or retreat under electric drive. In the present embodiment, the driving wheel side is referred to as a front side, the follower roller side is referred to as a rear side, and the left side and the right side are defined accordingly.
In order to lighten the working strength of operators, a pedal assembly 5 is arranged at the lower part of the front side of the front frame, and the pedal assembly comprises a pedal seat connected with the front frame and a pedal rotatably connected with the pedal seat. In order to facilitate the rotation of the pedal, as shown in fig. 3, a driving element consisting of a gas spring 6 is arranged between the pedal seat and the pedal, one end of the gas spring is hinged at the lower part of the pedal seat, and the other end of the gas spring is hinged at the lower side of the pedal. The basic structure of the gas spring is similar to that of a cylinder, and when the piston rod is pressed, the piston rod is retracted into the cylinder sleeve, so that the gas spring is shortened; when the force of the piston rod is removed, the piston rod is extended forward under the sub-action. Thus, when the operator stands on the pedal rotated downward to the horizontal state, the gas spring is in a compressed state; when the operator leaves the pedal, the gas spring expands to an extended state, thereby driving the pedal to rotate upward to a folded state vertically against the front frame.
As a preferred scheme, the underside of the pedal is provided with left and right hinge rods 51, each hinge rod comprises a straight rod 511 connected to the underside of the pedal and extending towards one side of the pedal seat, and a bent rod 512 formed by bending the rear end of the straight rod upwards, so that the hinge rod is L-shaped, the pedal seat is provided with left and right hinge brackets, and the end part of the bent rod of the hinge rod is hinged on the hinge bracket on the corresponding side of the pedal seat, so that the pedal can rotate up and down. In addition, a rotation groove 13 extending upwards is arranged at the front side of the pedal seat corresponding to the hinge rod, so that the hinge rod passes through the rotation groove and then is hinged on a hinge bracket in the pedal seat. When the pedal rotates upwards to a vertical folding state, the vertical straight rod of the hinging rod can be close to the pedal seat as much as possible, so that the overall dimension of the electric pallet truck is reduced to the greatest extent.
Furthermore, an elastic limiting block 12 made of polyurethane can be arranged in the pedal seat corresponding to the position of the hinging rod. When the pedal assembly is in a horizontal state, the straight rod of the hinging rod abuts against the corresponding limiting block, so that the pedal in the horizontal state has reliable positioning and good elastic support, and a good elastic shock absorbing effect can be formed for an operator standing on the pedal.
In order to lift the fork, a lifting cylinder 7 capable of lifting the rear frame is arranged in the front frame, the lifting connecting rod assembly comprises an L-shaped connecting rod 31 and a lifting connecting rod 32 extending along the front-rear direction, one end of the L-shaped connecting rod is hinged to the side wall of the front frame, the other end of the L-shaped connecting rod is hinged to the front end of the lifting connecting rod, and a turning part in the middle of the L-shaped connecting rod is connected to the side wall of the rear frame in a rotating way through a rotating pin shaft. In addition, the rear end of the lifting link is hinged to a follower fork 33, and the follower roller assembly is disposed within the opening of the follower fork. The front end of the fork is connected with the rear frame, and the middle part of the follow-up wheel fork is rotationally connected with the rear side of the fork through a pin shaft. Therefore, when the lifting oil cylinder drives the rear frame to ascend along with the front end of the fork, as one end of the L-shaped connecting rod is hinged to the front frame, the rear frame drives the L-shaped connecting rod to rotate, so that the lifting connecting rod is driven to move backwards, the lifting connecting rod drives the follow-up fork to rotate around the pin shaft arranged in the middle, and further drives the rear end of the fork hinged to the follow-up fork to ascend, and the fork at the moment pushes a pallet carrying goods away from the ground.
It will be appreciated that the height of the hinge point between the rear frame and the L-shaped link may be substantially equal to the height of the hinge point between the front frame and the L-shaped link, and the height of the hinge point between the L-shaped link and the lifting link should be lower than the height of the hinge point between the rear frame and the L-shaped link, and the hinge point between the L-shaped link and the lifting link should be located at the lower rear side of the hinge point between the front frame and the L-shaped link, so that when the rear frame is lifted, the hinge point between the rear frame and the L-shaped link does not substantially move rearward, and rotation of the hinge point between the L-shaped link and the lifting link may be decomposed into an upward movement and a rearward movement, at which time a displacement difference in the front-rear direction is formed between the lifting link and the fork, and the lifting link forms an axial rearward movement with respect to the fork. In addition, since the follower roller in the follower roller assembly is in contact with the ground, the hinge point of the lifting link and the follower fork should be disposed at the front upper side of the hinge point of the fork and the follower fork, so that when the lifting link moves backward relative to the fork, the follower fork rotates about the follower roller as a supporting point, and thus the hinge point of the fork and the follower fork also moves upward and backward. Of course, we can set up a synchronous horizontal pole 34 in the back frame, and the left end of synchronous horizontal pole is connected with the L-shaped connecting rod in the left side play to rise the connecting rod subassembly, and the right-hand member of synchronous horizontal pole is connected with the L-shaped connecting rod in the play to rise the connecting rod subassembly on right side to the L-shaped connecting rod in the connecting rod subassembly, and then can make two play to rise the connecting rod subassembly about realizing synchronous action.
In order to avoid adverse effect of unevenness of the ground on stress of the follower roller, the follower roller assembly can comprise a left synchronizing plate 42 and a right synchronizing plate which are arranged in parallel, a front follower roller 41 and a rear follower roller 41 which are arranged between the two synchronizing plates and are arranged side by side, the left end and the right end of the front follower roller are respectively connected with the front end of the synchronizing plate on the corresponding side, the left end and the right end of the rear follower roller are respectively connected with the rear end of the synchronizing plate on the corresponding side, the left end and the right end of the opening side of the follower roller fork are respectively connected with the middle part of the synchronizing plate on the corresponding side of the follower roller assembly in a rotating way, so that the two follower rollers can automatically adapt to inclination and unevenness of the ground, the two follower rollers are ensured to be always in uniform contact with the ground, and the bearing pressure of each follower roller is further reduced.
For easy handling, the lifting cylinder is vertically disposed in the front frame, and a power unit (not shown) for driving the lifting cylinder is disposed in the rear frame. The lower end of the cylinder barrel of the lifting oil cylinder is connected with a driving connecting seat, the driving wheel is arranged below the driving connecting seat, the upper end of a piston rod of the lifting oil cylinder is rotationally connected with the front end of the rear frame, and the front side mounting surface of the cylinder barrel of the lifting oil cylinder is fixedly connected with the lower end of the steering system. The power unit can drive the lifting oil cylinder to drive the rear frame to ascend, and meanwhile, the steering system can conveniently drive the driving wheel arranged under the driving connecting seat to rotate through the cylinder barrel of the lifting oil cylinder, so that the steering of the electric pallet truck is realized. It will be appreciated that a tank for storing hydraulic oil needs to be provided in the rear frame. When the rear frame needs to be lifted, the power unit inputs hydraulic oil in the oil tank into a working cavity of the lifting oil cylinder; when an operator opens an oil return pipeline of the lifting oil cylinder through operating the steering system, hydraulic oil in a working cavity of the lifting oil cylinder flows back into the oil tank, and the rear frame and the fork at the moment descend, so that the fork of the electric pallet truck can be conveniently pulled away from the lower surface of the pallet.
As an alternative to the foregoing, the lifting cylinders may also be manually driven, thereby eliminating the need for a corresponding power unit in the rear frame. Specifically, as shown in fig. 4, two control pedals 52 are arranged on the upper side of the pedals, a transverse spline sleeve 521 is arranged on the left rear side of the left control pedal, a transverse spline sleeve is arranged on the right rear side of the right control pedal, a hydraulic cylinder sleeve 53 which is transversely arranged on the left side and the right side is fixedly arranged in the middle position of the rear side of the pedal, screw sleeves 54 fixedly connected to the pedals are respectively arranged at the left end and the right end of the hydraulic cylinder sleeve on the rear side of the pedal, and the internal threads of the left screw sleeve and the right screw sleeve are opposite in rotation direction and coaxially arranged with the middle hydraulic cylinder sleeve. The working chamber of the hydraulic cylinder sleeve penetrates through two ends of the hydraulic cylinder sleeve, two extrusion plungers 55 are respectively matched with two ends of the working chamber of the hydraulic cylinder sleeve, a driving screw 56 is connected in each screw sleeve in a threaded mode, one end, close to the hydraulic cylinder sleeve, of the driving screw is coaxially connected with the extrusion plunger on the corresponding side, the other end of the driving screw is in spline connection with a spline sleeve of a control pedal on the corresponding side, and a reset spring (not shown in the figure) is arranged between the lower side of the control pedal and the upper side of the pedal assembly.
In addition, an oil outlet 532 and an oil inlet 531 which are communicated with the working cavity are arranged on the outer side of the middle part of the hydraulic cylinder sleeve, the oil outlet is communicated with the working cavity of the lifting cylinder through a pipeline, and a one-way valve which is communicated unidirectionally from the oil outlet to the lifting cylinder is arranged on the pipeline; the oil inlet is communicated with the oil tank through a pipeline, and a one-way valve which is communicated from the oil tank to the oil inlet in a one-way is arranged on the pipeline; the working cavity of the lifting oil cylinder is communicated with the oil tank through a pipeline provided with a control valve.
When an operator downwards treads the control pedal by the foot, the control pedal drives the driving screw rod to rotate forwards, at the moment, the driving screw rod axially moves under the action of the screw sleeve, so that the extrusion plunger connected with the driving screw rod is pushed to axially move forwards, the hydraulic oil pressure in the working cavity of the hydraulic cylinder sleeve is increased and enters the lifting cylinder through the oil outlet, the lifting cylinder drives the rear frame to rise, and at the moment, the one-way valve arranged on the pipeline between the oil inlet and the oil tank prevents the hydraulic oil from entering the oil tank through the oil inlet; when the feet of an operator lift up, the return spring drives the control pedal to rotate upwards, so that the drive screw is driven to rotate reversely, the drive screw pulls the extrusion plunger to move backwards axially, the hydraulic cylinder sleeve working cavity forms negative pressure, at the moment, the one-way valve arranged on the pipeline connecting the oil outlet and the lifting cylinder prevents hydraulic oil in the lifting cylinder from flowing back, and hydraulic oil in the oil tank enters the hydraulic cylinder sleeve working cavity through the oil inlet. And by analogy, the left foot and the right foot of an operator sequentially tread the control pedal, so that the manual hydraulic driving of the rear frame and the fork can be realized.
It should be noted that, one supporting seat may be respectively disposed on the left and right sides of the rear side of the pedal, so that the end portion of the driving screw connected with the spline housing may be supported on the supporting seat on the corresponding side.
Finally, as shown in fig. 5, a cuboid-shaped hinge block 22 is arranged in the middle of the front side of the rear frame, a spherical cavity 221 is arranged in the center of the hinge block, an insertion round hole 222 which vertically extends upwards and penetrates through the spherical cavity is arranged on the lower side surface of the hinge block, the center of the spherical cavity is positioned on the axis of the insertion round hole, a hinge disc 8 is arranged in the spherical cavity, and the circumferential surface of the hinge disc is a spherical surface which is matched in the spherical cavity. That is, the hinge disc is a drum-shaped disc obtained by cutting a sphere from two parallel planes symmetrically located at both sides of the center of the sphere, and an insertion through hole is provided at the center of the hinge disc. The upper end of a piston rod of the lifting oil cylinder is inserted into an insertion hole in the center of the hinged disc.
Because the spherical cavity of articulated disc and articulated piece is spherical connection, consequently, make on the one hand to rise the ascending axial thrust of articulated piece transmission that the hydro-cylinder accessible articulated disc to the back frame, can make simultaneously to rise between the upper end of the piston rod of hydro-cylinder and the articulated piece and can form 360 degrees articulations around the center of spherical cavity, can avoid rising the hydro-cylinder and appear the dead phenomenon of card between piston rod upper end and the back frame when the back frame rises of drive. Of course, a shaft shoulder can be arranged at the upper end of a piston rod of the lifting oil cylinder, so that the depth of the piston rod inserted into the inserting hole can be limited.
In order to facilitate the installation of the hinged disc, a rectangular mounting hole 223 with a width larger than the height of the hinged disc can be arranged on the lower side surface of the hinged block, two side walls of the rectangular mounting hole extending upwards to the width direction are tangential to the spherical cavity, the axis of the rectangular mounting hole is coaxial with the axis of the inserted circular hole, that is, the intersection point of the diagonal lines of the cross sections of the rectangular mounting hole is positioned on the axis of the inserted circular hole, so that the two side walls of the rectangular mounting hole in the length direction are symmetrically positioned on two sides of the axis of the inserted circular hole, and the length of the rectangular mounting hole is equal to the diameter of the spherical cavity. Therefore, the hinge disc can be rotated by 90 degrees firstly, the axis of the hinge disc is perpendicular to the axis of the insertion round hole, then the hinge disc is placed into the rectangular mounting hole at the height of the hinge disc, when the hinge disc is placed into the rectangular mounting hole, the hinge disc is attached to the spherical cavity and concentric, the hinge disc is rotated by 90 degrees at the moment, the axis of the hinge disc is overlapped with the axis of the insertion round hole, a piston rod of the lifting oil cylinder can be inserted into the insertion hole in the center of the hinge disc, the hinge disc can be reliably connected into the spherical cavity in a rotating mode, and the hinge disc is prevented from falling out of the spherical cavity. It will be appreciated that the bore diameter of the insertion bore should be greater than the diameter of the piston rod.
When the simple standing-driving type electric pallet truck is operated, the pedal assembly is unfolded, an operator stands on the pedal, so that the pedal extrudes the polyurethane limiting block to achieve the limiting effect, and the pedal assembly has a certain buffering and damping effect due to the elasticity of the polyurethane limiting block; when the pedal is retracted, the gas spring provides supporting force, so that the pedal is prevented from automatically overturning. The operator rotates the operating handle left and right to drive the cylinder barrel of the lifting oil cylinder to rotate, and simultaneously drives the driving system to rotate to finish steering movement.
In addition to the above preferred embodiments, the present invention has other embodiments, and various changes and modifications may be made by those skilled in the art without departing from the spirit of the invention, which is defined in the appended claims.
Claims (9)
1. The simple electric pallet truck comprises a truck body system, a driving system, a steering system, a lifting connecting rod assembly, a hydraulic system and an electric system, wherein the hydraulic system and the electric system are respectively arranged in the truck body system and are connected with the driving system, the simple electric pallet truck is characterized in that the driving system comprises a driving wheel which is arranged at the lower part of the truck body system and is driven by a motor, the upper end of the steering system is bent and extended above the truck body system, the lower end of the steering system is fixedly connected with the driving system or a hydraulic cylinder, the lifting connecting rod assembly is arranged at the rear side of the truck body system and is rotationally connected with the truck body system, a pedal assembly is connected with the front side of the truck body system, a driving element is arranged between the front truck frame of the truck body system and the pedal assembly, the driving element enables the pedal assembly to be positioned in a folded state of being abutted against the front truck frame, a buffer element is arranged in the pedal assembly, two control pedals are arranged at the upper sides of the pedal, transverse spline sleeves are arranged at the rear sides of the control pedals, hydraulic cylinder sleeves which are transversely arranged, a working cavity penetrates through the cylinder sleeves, hydraulic screw sleeves which are arranged at the rear sides of the pedal sleeves, and are respectively connected with corresponding screw bolts which are arranged at the two ends of the driving screw sleeves, and are respectively arranged at the two ends of the corresponding screw bolts which are in the opposite sides of the driving screw sleeves, and are in the screw sleeves which are in extrusion screw sleeves, and are coaxially connected with the screw bolts respectively, the oil outlet is communicated with a working cavity of the lifting oil cylinder through a pipeline provided with a one-way valve, the oil inlet is communicated with the oil tank through a pipeline provided with a one-way valve, the working cavity of the lifting oil cylinder is communicated with the oil tank through a pipeline provided with a control valve, when an operator steps down on a control pedal, the control pedal drives a driving screw to rotate forward, the driving screw pushes an extrusion plunger to move forward axially, and hydraulic oil in the working cavity of the hydraulic cylinder sleeve enters the lifting oil cylinder through the oil outlet, so that the lifting oil cylinder drives a rear frame to rise; when the feet of an operator lift up, the return spring drives the control pedal to rotate upwards, so that the drive screw is driven to rotate reversely, the drive screw pulls the extrusion plunger to move backwards axially, the hydraulic cylinder sleeve working cavity forms negative pressure, and hydraulic oil in the oil tank enters the hydraulic cylinder sleeve working cavity through the oil inlet.
2. The simple electric pallet truck according to claim 1, wherein the pedal assembly comprises a pedal seat connected to the front frame and a pedal connected to the pedal seat, a left hinge rod and a right hinge rod are arranged on the lower side of the pedal, the end parts of the hinge rods are hinged to a hinge bracket in the pedal seat, one end of the driving element is rotatably connected with the front frame, the other end of the driving element is rotatably connected with the pedal, and the buffer element is fixed on the pedal seat and supported below the hinge rods.
3. The simple electric pallet truck according to claim 2, wherein the buffer element is an elastic limiting block which is arranged at the bottom of the pedal seat and corresponds to the position of the hinge rod and can provide elastic restoring force, the elastic limiting block is made of polyurethane, and when the pedal assembly is turned forwards to a horizontal state, the hinge rod abuts against the corresponding elastic limiting block.
4. The simple and easy electric pallet jack of claim 1, wherein the driving member is a gas spring, one end of the gas spring is hinged to the pedal seat, the other end of the gas spring is hinged to the underside of the pedal, and the gas spring keeps the pedal in an upturned state against gravity.
5. The simple electric pallet truck according to claim 1, wherein the rear end of the lifting connecting rod assembly is provided with a follow-up roller assembly, and the rear end of the lifting connecting rod assembly is rotationally connected with the middle part of the connecting plate in the follow-up roller assembly, so that the follow-up roller of the follow-up roller assembly can swing up and down.
6. The simple electric pallet truck according to claim 1, wherein the truck body system comprises a front truck frame and a rear truck frame, a lifting oil cylinder is vertically arranged in the front truck frame, the hydraulic system comprises a power unit which is arranged in the rear truck frame and is used for driving the lifting oil cylinder, the lower end of a cylinder barrel of the lifting oil cylinder is fixedly connected with the upper end of a driving system, so that the cylinder barrel can rotate along with the driving system, the upper end of a piston rod of the lifting oil cylinder is rotationally connected with the upper end of the front truck frame, and the steering system is connected to the side surface of the cylinder barrel at the lower part of the lifting oil cylinder.
7. The simple electric pallet truck according to claim 1, wherein a rotating shaft is arranged at the upper end of the driving system, a rotating hole is arranged on the front frame, and the rotating shaft is rotatably connected with the rotating hole.
8. The simple electric pallet truck according to claim 1, wherein the steering system comprises a steering handle and a connecting bracket, the lower end of the connecting bracket is fixedly connected with the driving system or the hydraulic cylinder, the upper end of the connecting bracket is bent and extends to the upper part of the car body system, the lower end of the steering handle is rotatably connected with the upper end of the connecting bracket, and the rotary connecting point is positioned above the car body system.
9. The simple electric pallet truck according to claim 1, wherein the front side of the rear frame is provided with a hinging block, a spherical cavity is arranged in the hinging block, the lower side surface of the hinging block is provided with an insertion round hole which vertically extends upwards and penetrates through the spherical cavity, the center of the spherical cavity is positioned on the axis of the insertion round hole, a hinging disc is arranged in the spherical cavity, the circumferential surface of the hinging disc is a spherical surface which is matched in the spherical cavity, the upper end of a piston rod of the lifting oil cylinder is inserted into an inserting hole in the center of the hinging disc, the lower side surface of the hinging block is provided with a rectangular mounting hole with the width larger than the height of the hinging disc, the side walls of the rectangular mounting hole extending upwards to the two width directions are tangent with the spherical cavity, and the axis of the rectangular mounting hole is coaxial with the axis of the insertion round hole.
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| CN201810783494.3A CN108726445B (en) | 2018-07-17 | 2018-07-17 | Simple electric pallet truck |
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| CN108726445B true CN108726445B (en) | 2023-07-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110028023A (en) * | 2019-05-17 | 2019-07-19 | 谢瑞同 | A kind of electrocar and its working method |
| CN113845065B (en) * | 2021-08-23 | 2023-04-11 | 杭叉集团(天津)新能源叉车有限公司 | Lifting structure for pallet truck for improving lifting stability and lifting height |
| CN114394557A (en) * | 2021-12-31 | 2022-04-26 | 浙江西车智能物流装备有限责任公司 | Electric carrying forklift |
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