Standing electric carrier

Abstract

The invention relates to a freight transport device, and discloses a standing type electric carrier which comprises a rear frame and a front frame mounted on the rear frame, a driving wheel and a driven wheel are mounted at the bottom of the rear frame, and the front frame comprises forks and a bearing shaft mounted on the two forks; the driving wheel is mounted at the front end of the rear frame, and the driven wheel is mounted at the rear end of the rear frame; the bearing shaft is installed on the rear frame and arranged between the driving wheel and the driven wheel, on the bottom surface projection plane, the vertical distance between the driven wheel and the bearing shaft is a, the vertical distance between the driving wheel and the bearing shaft is b, and a is larger than b. Bearing shafts of the front frame and the rear frame are arranged between driving wheels and driven wheels of the rear frame, the rear frame serves as a base of the bearing shafts, the front frame is supported to be lifted, meanwhile, the pressure of the front frame on the rear frame is automatically distributed to the driving wheels and the driven wheels according to a certain proportion, and light steering during no-load is achieved. And the driving wheel is sufficient in pressure and cannot slip during heavy load.

Description

Technical Field

[0001] The present invention relates to a freight handling device, and more particularly to a stand-on electric forklift truck. Background Art

[0002] A stand-on forklift truck is used to handle goods. After the forks of the forklift truck lift the goods, the operator does not need to manually pull the forklift truck. The operator can stand on the forklift truck to move the goods, which is highly flexible and time-saving and labor-saving for the operator. Stand-on forklift trucks are mainly used in large warehouses, factories, supermarkets and other places.

[0003] At present, the structures of stand-on forklift trucks on the market are diverse. The forklift truck basically includes a front frame and a rear frame. The drive source device is installed on the rear frame, and the goods are placed on the front frame. During handling, the operator stands on the rear frame and controls the rear frame to drive the front frame to move. The current rear frame includes drive wheels and auxiliary driven wheels arranged on both sides of the drive wheels. For example, Figure 7 , the drive wheels and the auxiliary driven wheels are installed on the same axis. The synchronous cross bar of the front frame is installed at the front end of the rear frame, and the synchronous cross bar is on the same side as the drive wheels and the auxiliary driven wheels. Due to the uneven pressure distribution of the forklift truck, when encountering uneven ground, the drive wheels are prone to suspension and getting stuck in pits. To solve this problem, the current conventional design is to increase the suspension device and the pressure boosting device, so that the drive wheels can pass through the uneven ground more smoothly, but it also increases the structure and manufacturing cost of the forklift truck. Forklift trucks without a floating device and a pressure boosting device are prone to slipping. The pressure boosting device is also divided into two types: one is hydraulic cylinder pressure boosting. For example, the publication number is CN 108726445 B. When the goods on the forklift truck are heavy, it can distribute the pressure to ensure that the rear part of the vehicle is empty and the vehicle is light, and the heavy vehicle is heavy. However, this pressure boosting method has a complex structure and high cost; the other is spring pressure boosting. This requires the rear frame of the forklift truck to be designed relatively heavy, with the spring pressing on the drive wheels and the pressure on the auxiliary driven wheels being relatively small. The forklift truck is prone to shaking during driving. Summary of the Invention

[0004] In view of the shortcoming that the front frame in the prior art cannot automatically distribute the pressure to the rear frame, the present invention provides a stand-on electric forklift truck.

[0005] To solve the above technical problems, the present invention is solved by the following technical solutions:

[0006] A stand-on electric forklift truck includes a rear frame and a front frame installed on the rear frame. A drive wheel and a driven wheel are installed at the bottom of the rear frame. The front frame includes forks and a bearing shaft installed on the two forks; the drive wheel is installed at the front end of the rear frame, and the driven wheel is installed at the rear end of the rear frame; the bearing shaft is installed on the rear frame and is located between the drive wheel and the driven wheel. In the bottom projection plane, the vertical distance from the driven wheel to the bearing shaft is a, and the vertical distance from the drive wheel to the bearing shaft is b, and a > b.

[0007] The load-bearing shaft of the front and rear frames is arranged between the drive wheel and the driven wheels of the rear frame. With the rear frame as the base, while supporting the lifting of the front frame, the pressure of the front frame on the rear frame is automatically distributed to the drive wheel and the driven wheels in a certain proportion, achieving light steering during no-load operation and sufficient pressure on the drive wheels without slipping during heavy-load operation.

[0008] Preferably, the number of driven wheels is at least two. The driven wheels include a base and driven rollers mounted on the base. The central axes of all bases are in the same plane, and a is the perpendicular distance from the central axis of the load-bearing shaft to the plane; the drive wheel includes a wheel seat and drive rollers mounted on the wheel seat, and b is the perpendicular distance from the central axis of the load-bearing shaft to the central axis of the wheel seat. Multiple driven wheels are provided on the forklift truck, so that the forklift truck has good stability during driving.

[0009] Preferably, the rear frame includes a housing and a bearing plate for the operator to stand on. The bearing plate is fixed on the housing. The driven wheels are universal wheels, and the bases of all driven wheels are fixed on the bearing plate; both ends of the load-bearing shaft are fixed on the housing. With universal wheels as the driven wheels, the forklift truck rotates flexibly; with the rear frame as the support point, it is convenient for the front frame to lift.

[0010] Preferably, the rear frame includes a baffle. The lower end of the baffle is fixedly connected to the bearing plate, and both sides of the baffle are connected to the housing. Through holes for components in the front frame to pass through are provided on both sides of the lower end of the baffle; a pedal for the operator to stand on is installed on the bearing plate, and the pedal covers the through holes when installed on the bearing plate. The through holes on the baffle can allow components in the front frame to pass through, thereby reducing the overall length of the forklift truck and making the structure of the forklift truck more compact. On the one hand, the pedal is used to cover the bearing plate to provide a standing space for the operator; on the other hand, it is used to block the through holes to prevent foreign objects from passing through the holes and affecting the front frame, and at the same time improve the overall aesthetics of the forklift truck.

[0011] Preferably, the front frame includes rocker arms, a lifting driver, and a connecting rod roller assembly installed on the forklift forks. The two rocker arms are respectively arranged on both sides of the load-bearing shaft. One end of the rocker arm is hinged to the connecting rod roller assembly, and one end of the lifting driver is installed on the forklift forks, and the other end of the lifting driver is connected to the other end of the rocker arm and drives it to swing. The front frame is equipped with its own lifting driver, and the lifting driver can drive the rollers on the front frame to leave the ground. Traditional lifting drivers are all installed on the rear frame, and there are multiple connections between the front frame and the rear frame. Since the lifting driver of this forklift truck is directly designed on the front frame, there is only one-axis connection between the front frame and the rear frame, and the connection structure is simple. Except for the steering structure, there are fewer other auxiliary structures in the rear frame, so that the rear frame has a large space and few structures, and the layout is flexible, and it can be adapted to various configurations such as high-end and low-end drive units, lead-acid batteries / lithium batteries / maintenance-free batteries.

[0012] Preferably, the front frame further includes a shaft tube for mounting the load-bearing shaft, and two rocker arms are respectively fixed at both ends of the shaft tube. The shaft tube and the rocker arms are fixed to form an integral body, which is convenient for disassembly and assembly. The two rocker arms can swing synchronously, so as to facilitate the lifting of the rollers under the fork of the front support.

[0013] Preferably, a support seat is fixed on the inner wall of the housing, and the load-bearing shaft is fixedly connected to the housing through the support seat (117). The support seat is used to support the load-bearing shaft to ensure the stability of the load-bearing shaft on the housing.

[0014] Preferably, the load-bearing shaft is a split pin shaft. The load-bearing shaft includes a left shaft and a right shaft. One end of the left shaft is fixed on one side of the housing, and the other end is inserted into one end of the shaft tube; one end of the right shaft is fixed on the other side of the housing, and the other end is inserted into the other end of the shaft tube. The split load-bearing shaft is convenient for processing and not easy to bend, so that the shaft tube can rotate stably on the load-bearing shaft.

[0015] Preferably, a baffle frame is installed between the two forks, and the lifting drive is installed on the baffle frame. A passage for the drive wheel to pass through is formed among the baffle frame, the load-bearing shaft and the two rocker arms. The baffle frame plays a role of shielding on the one hand, preventing the lifting drive from being exposed on the side, on the other hand, serving as a support for the lifting drive and facilitating its installation, and on the third hand, the baffle frame can connect the two forks together.

[0016] Preferably, the connecting rod roller assembly includes a connecting rod and a follower roller assembly. The connecting rod is hinged to the follower roller assembly through a pin shaft. The pin shaft is installed on the fork, and the other end of the connecting rod is hinged to the rocker arm.

[0017] Due to the adoption of the above technical solutions, the present invention has remarkable technical effects:

[0018] 1. The front frame is equipped with a lifting drive by itself, so that only the connection at the load-bearing shaft is required between the front frame and the rear frame, and the disassembly and assembly of the front frame and the rear frame are convenient;

[0019] 2. The three-wheeled rear frame structure has no internal moving structure except the steering structure. It has a large space but few structures and a flexible layout, and can be adapted to various configurations such as high-configured and low-configured drive units, lead-acid batteries / lithium batteries / maintenance-free batteries, etc.;

[0020] 3. The combination of the front and rear frames is through the load-bearing shaft. The load-bearing shaft is arranged between the drive wheel and the driven wheel of the rear frame. With the rear frame as the base, while supporting the lifting of the front frame, the pressure of the front frame on the rear frame is automatically distributed to the drive wheel and the driven wheel in a certain proportion, realizing light steering during no-load and sufficient pressure on the drive wheel without slipping during heavy load. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present invention from the first perspective.

[0022] Figure 2 It is a schematic structural diagram from the second perspective of the present invention.

[0023] Figure 3 It is a schematic structural diagram from the third perspective of the present invention.

[0024] Figure 4 It is a schematic structural diagram of the front frame and the support seat.

[0025] Figure 5 It is a schematic structural diagram from the fourth perspective of the present invention.

[0026] Figure 6 It is a schematic structural diagram of the present invention without the housing and the carrier plate installed.

[0027] Figure 7 It is a schematic structural diagram of a traditional forklift truck.

[0028] The names of the parts referred to by the respective numerical labels in the above drawings are as follows:

[0029] 10 - Rear frame, 101 - Housing, 102 - Carrier plate, 103 - Baffle, 1031 - Through hole

[0030] 11 - Front frame, 111 - Fork, 112 - Bearing shaft, 113 - Rocker arm, 114 - Lifting driver, 115 - Link roller assembly, 116 - Axle tube, 117 - Support seat, 118 - Fixed plate, 119 - Reinforcing rib plate, 1121 - Left shaft, 1122 - Right shaft, 1151 - Link, 1152 - Follow-up roller assembly, 1153 - Pin shaft

[0031] 12 - Driving wheel, 121 - Wheel seat, 122 - Driving roller

[0032] 13 - Driven wheel, 131 - Base, 132 - Driven roller

[0033] 14 - Pedal

[0034] 15 - Baffle frame

[0035] 100 - Plane

[0036] 200 - Channel

[0037] 12a - Traditional driven wheel

[0038] 13a - Driven driving wheel Specific embodiments

[0039] The following will further describe the present invention in detail with reference to the Figure 1-7 accompanying drawings and embodiments.

[0040] Embodiment 1

[0041] Stand-on electric forklift truck, including a rear frame 10 and a front frame 11 mounted on the rear frame 10. Driving wheels 12 and driven wheels 13 are mounted at the bottom of the rear frame 10. The driving wheels 12 are rotated under the drive of a motor, and the driven wheels 13 play a balancing role and move in a following manner. The front frame 11 includes forks 111 and a bearing shaft 112 mounted on the two forks. The driving wheels 12 are mounted at the front end of the rear frame 10, and the driven wheels 13 are mounted at the rear end of the rear frame 10. The driving wheels 12 and the driven wheels 13 are not on the same axis; the bearing shaft 112 is mounted on the rear frame 10 and is arranged between the driving wheels 12 and the driven wheels 13. Fixing plates 118 are mounted at the ends of the bearing shaft 112, and the fixing plates 118 are fastened to the rear frame 10 by bolts. In the bottom projection plane, the vertical distance from the driven wheel 13 to the bearing shaft 112 is a, and the vertical distance from the driving wheel 12 to the bearing shaft 112 is b, where a > b. The bearing shaft 112 is not arranged on the same side of the driving wheel 12 and the driven wheel 13. The front frame 11 and the rear frame 10 are combined through the bearing shaft 112. The bearing shaft 112 is arranged between the front driving wheels 12 (front wheels) and the driven wheels 13 (rear wheels) of the rear frame 10. With the rear frame 10 as the base, while supporting the lifting of the front frame 11, the pressure of the front frame 11 on the rear frame 10 is automatically distributed to the driving wheels 12 and the driven wheels 13 in a certain proportion, achieving light steering during no-load and sufficient pressure on the driving wheels 12 without slipping during heavy load. The traditional driven wheels 12a and driving wheels 13a are arranged on the same axis, as Figure 7 shown. For the forklift truck with this structure, when encountering uneven ground, the driving wheels are easily stuck in the pits and cannot move.

[0042] The number of the driven wheels 13 is at least two. In this embodiment, the number of the driven wheels 13 is two. The two driven wheels 13 are arranged on both sides at the rear end of the rear frame 10, and the two driven wheels 13 form a triangular relationship with the driving wheels 12. The driven wheel 13 includes a base 131 and a driven roller 132 mounted on the base 131. The central axes of all the bases 131 are in the same plane 100, and a is the vertical distance from the central axis of the bearing shaft 112 to the plane 100; the driving wheel 12 includes a wheel seat 121 and a driving roller 122 mounted on the wheel seat 121, and b is the vertical distance from the central axis of the bearing shaft 112 to the central axis of the wheel seat 121.

[0043] The rear frame 10 includes a housing 101 and a bearing plate 102 for the operator to stand on. The bearing plate 102 is used to mount the driven wheels 13. The bearing plate 102 is horizontally welded on the housing 101. The operator stands above the bearing plate 102. The driven wheels 13 are universal wheels and are flexible in turning. The bases 131 of all the driven wheels 13 are fastened to the bearing plate 102 by bolts; both ends of the bearing shaft 112 are fixed to the housing 101 through fixing plates 118.

[0044] A support seat 117 is welded to the inner wall of the outer shell 101. The support seat 117 is a U-shaped seat. The two side plates of the support seat 117 are welded to the outer shell 101. A shaft hole is provided on the end face plate of the support seat 117. The load-bearing shaft 112 is fixedly connected to the outer shell 101 through the shaft hole.

[0045] The rear frame 10 includes a baffle 103. The lower end of the baffle 103 is welded to the bearing plate 102. The two sides of the baffle 103 are welded to the outer shell 101. Through holes 1031 for the components in the front frame 11 to pass through are provided on both sides of the lower end of the baffle 103. The components of the front frame 11 extend into the through holes 1031, so that the connection between the rear frame 10 and the front frame 11 is more compact and the overall length is shorter. A pedal 14 for the operator to stand on is installed on the bearing plate 102. In this embodiment, the pedal 14 is snap-fitted on the bearing plate 102, and the through holes 1031 are blocked when the pedal 14 is installed on the bearing plate 102.

[0046] The front frame 11 includes a rocker arm 113, a lifting driver 114, and a connecting rod roller assembly 115 installed on the forklift forks 111. The connecting rod roller assembly 115 is arranged directly below the forklift forks 111. In this embodiment, the load-bearing shaft 112 is a single shaft. The two rocker arms 113 are respectively sleeved on both sides of the load-bearing shaft 112. One end of the rocker arm 113 is hinged to the connecting rod roller assembly 115. One end of the lifting driver 114 is installed on the forklift forks 111, and the other end of the lifting driver 114 is connected to the other end of the rocker arm 113 and drives it to swing. The lifting driver 114 is of an oil cylinder structure. During handling, the lifting driver 114 can drive the connecting rod roller assembly 115 to lift, so as to lift the forklift forks 111.

[0047] A baffle frame 15 is installed between the two forklift forks 111. The lifting driver 114 is installed on the baffle frame 15. The baffle frame 15 is welded to the two forklift forks 111. The baffle frame 15 connects the two forklift forks 111 together to form a whole. A channel 200 for the driving wheel 12 to pass through is formed among the baffle frame 15, the load-bearing shaft 112, and the two rocker arms 113, further limiting the position of the driving wheel 12.

[0048] The connecting rod roller assembly 115 includes a connecting rod 1151 and a follower roller assembly 1152. The connecting rod 1151 is hinged to the follower roller assembly 1152 through a pin shaft 1153. The pin shaft 1153 is installed on the fork 111, and the other end of the connecting rod 1151 is hinged to the rocker arm 113. When the fork is lifted, the lifting driver 114 pushes the rocker arm 113 to swing. The rocker arm 113 will push the connecting rod 1151, and the connecting rod 1151 will push the follower roller assembly 1152 to rotate around the pin shaft 1153, so that the follower roller assembly 1152 will support the fork 111; when the fork descends, the lifting driver 114 pulls the rocker arm 113 to swing. The rocker arm 113 will pull the connecting rod 1151, and the connecting rod 1151 will pull the follower roller assembly 1152 to rotate around the pin shaft 1153, so that the fork 111 descends.

[0049] Embodiment 2

[0050] Embodiment 2 is basically the same as Embodiment 1, except that the front frame 11 further includes a shaft tube 116 for installing the bearing shaft 112. Two rocker arms 113 are respectively welded to both ends of the shaft tube 116, and the rocker arms 113 rotate synchronously with the shaft tube 116. A reinforcing rib plate 119 is also welded between the rocker arm 113 and the shaft tube 116, so that the connection between the rocker arm 113 and the shaft tube 116 is more reliable. When the front bracket 11 is installed on the rear bracket 10, the support seat 117 is arranged between the housing 101 and the shaft tube 116.

[0051] The bearing shaft 112 is a split pin shaft, that is, the bearing shaft 112 includes a left shaft 1121 and a right shaft 1122. One end of the left shaft 1121 is fixed to one side of the housing 101 through a fixing plate 118 thereon, and the other end thereof is inserted into one end of the shaft tube 116; one end of the right shaft 1122 is fixed to the other side of the housing 101 through a fixing plate 118 thereon, and the other end thereof is inserted into the other end of the shaft tube 116.

[0052] Embodiment 3

[0053] Embodiment 3 is basically the same as Embodiment 1 or 2, except that the lifting driver 114 can also be a cylinder.

[0054] Embodiment 4

[0055] Embodiment 4 is basically the same as Embodiment 1 or 2, except that the lifting driver 114 can also be a motor screw rod slider structure. The motor is installed on the fork 111. The motor drives the screw rod to rotate. The slider is hinged to the rocker arm 113. The screw rod rotates and drives the slider to slide thereon, so as to drive the rocker arm 113 to swing.

Claims

1. A stand-on electric transport vehicle, comprising a rear frame (10) and a front frame (11) mounted on the rear frame (10), a driving wheel (12) and a driven wheel (13) being mounted on the bottom of the rear frame (10), and the front frame (11) comprising a fork (111) and a load-bearing shaft (112) mounted on the two forks; characterized in that: The driving wheel (12) is mounted on the front end of the rear frame (10), and the driven wheel (13) is mounted on the rear end of the rear frame (10); the load-bearing shaft (112) is mounted on the rear frame (10) and is arranged between the driving wheel (12) and the driven wheel (13); on the bottom projection plane, the vertical distance from the driven wheel (13) to the load-bearing shaft (112) is a, and the vertical distance from the driving wheel (12) to the load-bearing shaft (112) is b, and a>b.

2. The stand-on electric transport vehicle according to claim 1, characterized in that: The number of driven wheels (13) is at least two, and the driven wheels (13) include a base (131) and a driven roller (132) mounted on the base (131), the central axes of all the bases (131) are on the same plane (100), and a is the vertical distance from the central axis of the bearing shaft (112) to the plane (100); the driving wheel (12) includes a wheel seat (121) and a driving roller (122) mounted on the wheel seat (121), and b is the vertical distance from the central axis of the bearing shaft (112) to the central axis of the wheel seat (121).

3. The stand-on electric transport vehicle according to claim 1, characterized in that: The rear frame (10) comprises a housing (101) and a bearing plate (102) for an operator to stand on, the bearing plate (102) being fixed on the housing (101), the driven wheels (13) being universal wheels, and the bases (131) of all the driven wheels (13) being fixed on the bearing plate (102); and both ends of a bearing shaft (112) being fixed on the housing (101).

4. The stand-on electric transport vehicle according to claim 3, characterized in that: A support seat (117) is fixed on the inner wall of the outer shell (101), and the bearing shaft (112) is fixedly connected to the outer shell (101) via the support seat (117).

5. The stand-on electric transport vehicle according to claim 1, characterized in that: The front frame (11) comprises a rocker arm (113), a lifting driver (114) and a connecting rod roller assembly (115) mounted on a fork (111); two rockers (113) are respectively arranged on both sides of a bearing shaft (112); one end of the rocker arm (113) is hinged to the connecting rod roller assembly (115); one end of the lifting driver (114) is mounted on the fork (111); and the other end of the lifting driver (114) is connected to the other end of the rocker arm (113) and drives the rocker arm (113) to swing.

6. The stand-on electric transport vehicle according to claim 5, characterized in that: The front frame (11) also includes an axle tube (116) for mounting the load-bearing axle (112), and two rocker arms (113) are respectively fixed at two ends of the axle tube (116).

7. The stand-on electric transport vehicle according to claim 6, characterized in that: The load-bearing shaft (112) is a split pin shaft, and the load-bearing shaft (112) comprises a left shaft (1121) and a right shaft (1122), wherein one end of the left shaft (1121) is fixed on one side of the housing (101), and the other end thereof is inserted into one end of the shaft tube (116); and one end of the right shaft (1122) is fixed on the other side of the housing (101), and the other end thereof is inserted into the other end of the shaft tube (116).

8. The stand-on electric transport vehicle according to claim 5, characterized in that: A baffle frame (15) is installed between the two forks (111), and a lifting driver (114) is installed on the baffle frame (15). A passage (200) for the driving wheel (12) to pass through is formed between the baffle frame (15), the bearing shaft (112) and the two rocker arms (113).

9. The stand-on electric transport vehicle according to claim 5, characterized in that: The connecting rod roller assembly (115) comprises a connecting rod (1151) and a follower roller assembly (1152). The connecting rod (1151) is hinged to the follower roller assembly (1152) via a pin shaft (1153). The pin shaft (1153) is mounted on the fork (111). The other end of the connecting rod (1151) is hinged to the rocker arm (113).

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