Standing type forklift with hydraulic power-assisted steering function

Abstract

The utility model relates to the technical field of forklifts, in particular to a standing type forklift with a hydraulic power-assisted steering function, which comprises a forklift body, a steering handlebar is fixedly connected to the top of a handlebar steering shaft, a first steering angle sensor is fixedly connected to the bottom of the handlebar steering shaft, a hydraulic cylinder is fixedly mounted in a frame, and a second steering angle sensor is fixedly mounted in the frame. And a universal shaft is movably installed in the rack, the outer side of the transmission connecting rod is sleeved with a micro-motion spring, and the top of the universal shaft is fixedly connected with a second steering angle sensor. According to the standing type forklift with the hydraulic power-assisted steering function, by rotating the steering handlebar, the steering handlebar drives the handlebar steering shaft, the ECU control panel detects the rotating angle and direction of the handlebar steering shaft and the rotating angle and direction of the universal shaft through the first steering angle sensor and the second steering angle sensor respectively, and then the ECU control panel controls the electric power-assisted pump to feed oil to the hydraulic air cylinder; the universal shaft is pushed to rotate, so that the steering wheel can be adjusted left and right to control the forklift body to turn.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, in particular to a stand-up forklift with hydraulic power steering. Background Art

[0002] Forklifts are industrial handling vehicles, which refer to various wheeled handling vehicles that load and unload, stack and transport palletized goods over short distances. The International Organization for Standardization ISO / TC110 calls them industrial vehicles, which are often used for transporting large objects in warehouses and are usually powered by fuel engines or batteries.

[0003] After searching, it is found that a utility model patent with Chinese patent publication number CN219449220U discloses an electric stand-up counterweight heavy forklift. The forklift in the utility model patent drives the handlebar steering shaft to rotate by the handlebar, and then the connecting piece on the handlebar steering shaft pulls the connecting rod to move, and the connecting rod pulls the connecting piece on the wheel steering shaft to rotate and makes the wheel steering shaft rotate together, and finally realizes the rotation of the steering wheel. However, the steering method of the electric stand-up counterweight heavy forklift is to transmit through a mechanical structure, and at the same time, the forklift cannot realize on-site steering and needs to perform steering operations when the vehicle is started. Therefore, the steering structure of the electric stand-up counterweight heavy forklift needs to be further improved, so a stand-up forklift with hydraulic power steering is proposed. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model provides a stand-up forklift with hydraulic power steering, which has the advantage of controlling the vehicle's on-the-spot steering through hydraulic power steering, and solves the problem that the electric stand-up counterweight forklift in the above-mentioned background technology has a mechanical steering structure and cannot achieve on-the-spot steering of the vehicle.

[0005] To achieve the above object, the utility model provides the following technical solution: a stand-on forklift with hydraulic power steering, comprising a forklift body, the inner side of the forklift body is fixedly connected to a frame, and a steering drive structure is arranged inside the frame;

[0006] The steering drive structure includes a handlebar seat fixedly mounted on the top of a frame, a handlebar steering shaft movably mounted on the bottom of the handlebar seat, a steering handlebar is fixedly connected to the top of the handlebar steering shaft, a first steering angle sensor is fixedly connected to the bottom of the handlebar steering shaft, a hydraulic cylinder is fixedly mounted inside the frame, a universal shaft is movably mounted inside the frame, a transmission connecting rod is rotatably connected to the top rear end of the universal shaft, a micro-spring is sleeved on the outer side of the transmission connecting rod, a second steering angle sensor is fixedly connected to the top of the universal shaft, a reset switch assembly is fixedly mounted inside the frame, and a gas spring is arranged on the top of the handlebar seat.

[0007] Furthermore, the right end of the hydraulic cylinder is movably connected to a hydraulic push rod, the right end of the hydraulic push rod is rotatably connected to the front end of the universal shaft, an oil storage tank is fixedly installed inside the frame, and an electric power steering pump is fixedly installed outside the oil storage tank.

[0008] Furthermore, the reset switch assembly includes a first reset switch and a second reset switch, the first reset switch and the second reset switch are both located on the rear side of the transmission connecting rod, the micro-motion spring is provided with a touch head on the outside, and the first reset switch and the second reset switch are both provided with a sensing module on the side facing the micro-motion spring.

[0009] Furthermore, an operation control system is arranged outside the steering handlebar, and the operation control system includes an ECU control panel fixedly mounted on the top of the steering handlebar, a controller is fixedly mounted on the back of the frame, and the electric power steering pump and the controller are both electrically connected to the ECU control panel.

[0010] Furthermore, a bogie is fixedly connected to the bottom of the universal joint, a steering wheel is fixedly installed on the inner side of the bogie, photoelectric coupling elements are arranged inside the first steering angle sensor and the second steering angle sensor, both of the photoelectric coupling elements are connected to the ECU control panel signal, a brake assembly is arranged outside the frame, the brake assembly includes a brake handle arranged on the top of the rear side of the steering handlebar, and the brake handle is electrically connected to the controller.

[0011] Furthermore, an electric push rod is fixedly installed on the top left side of the frame, a brake line is fixedly connected to the top of the electric push rod, two driving wheels are movably installed on the left bottom of the frame, brake pads are movably connected to the inner sides of the two driving wheels, and one end of the brake line is connected to the two brake pads.

[0012] Furthermore, a lifting assembly is arranged on the left side of the frame, and the lifting assembly includes a gantry movably mounted on the left side of the frame, a landing gear is slidably connected to the left side of the gantry, a first hydraulic cylinder is fixedly mounted inside the frame, and a second hydraulic cylinder is fixedly mounted on the inner side of the gantry.

[0013] Furthermore, a battery is arranged in the frame, and square tubes with grooves are fixedly mounted at both ends of the rear side of the frame, and pedals are mounted on the square tubes.

[0014] Beneficial Effects

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0016] The stand-up forklift with hydraulic power steering drives the handlebar steering shaft by turning the steering handlebar, and the ECU control panel detects the rotation angle and direction of the handlebar steering shaft and the universal shaft through the first steering angle sensor and the second steering angle sensor respectively, and then the ECU control panel controls the electric power pump to send oil to the hydraulic cylinder to push the universal shaft to rotate, so that the steering wheel can be adjusted left and right, and at the same time, when the contact head of the micro-spring contacts the sensing module of the first reset switch and the second reset switch respectively, the ECU control panel controls the hydraulic cylinder to push the universal shaft to rotate, so that the forklift body automatically returns to the straight position after turning, and the effect of hydraulic power steering of the forklift body is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of the forklift body structure of the utility model;

[0018] Figure 2 for Figure 1 Cross-sectional view of perspective;

[0019] Figure 3 for Figure 1 Partial right view of the perspective;

[0020] Figure 4 for Figure 2 Schematic diagram of the handlebar steering shaft structure in perspective;

[0021] Figure 5 for Figure 4 Partial top view from perspective.

[0022] In the figure: 1, forklift body; 2, frame; 3, steering drive structure; 301, handlebar seat; 302, handlebar steering shaft; 303, steering handlebar; 304, first steering angle sensor; 305, hydraulic cylinder; 306, universal shaft; 307, transmission connecting rod; 308, micro spring; 309, second steering angle sensor; 310, reset switch assembly; 3101, first reset switch; 3102, second reset switch; 311, air cylinder Spring; 4. Oil storage tank; 5. Electric power pump; 6. Operation control system; 601. ECU control panel; 602. Controller; 7. Steering wheel; 8. Brake assembly; 801. Brake handle; 802. Electric push rod; 803. Driving wheel; 804. Brake pad; 9. Lifting assembly; 901. Mast; 902. Landing gear; 903. First hydraulic cylinder; 904. Second hydraulic cylinder; 10. Battery; 11. Square tube; 12. Foot pedal. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-5 A stand-up forklift with hydraulic power steering comprises a forklift body 1, a frame 2 is fixedly connected to the inner side of the forklift body 1, and a steering drive structure 3 is arranged inside the frame 2;

[0025] The steering drive structure 3 includes a handlebar seat 301 fixedly mounted on the top of the frame 2, a handlebar steering shaft 302 is movably mounted on the bottom of the handlebar seat 301, a steering handle 303 is fixedly connected to the top of the handlebar steering shaft 302, a first steering angle sensor 304 is fixedly connected to the bottom of the handlebar steering shaft 302, a hydraulic cylinder 305 is fixedly mounted inside the frame 2, a universal shaft 306 is movably mounted inside the frame 2, a transmission connecting rod 307 is rotatably connected to the top rear end of the universal shaft 306, a micro-spring 308 is sleeved on the outer side of the transmission connecting rod 307, a second steering angle sensor 309 is fixedly connected to the top of the universal shaft 306, a reset switch assembly 310 is fixedly mounted inside the frame 2, and a gas spring 311 is arranged on the top of the handlebar seat 301.

[0026] Specifically, by rotating the steering handlebar 303, the steering handlebar 303 rotates an angle and transmits the rotation amplitude to the handlebar steering shaft 302 connected at the bottom, and the first steering angle sensor 304 connected to the handlebar steering shaft 302 detects the rotation direction and rotation angle thereof, and transmits the data information of the rotation of the handlebar steering shaft 302 to the ECU control panel 601, and the ECU control panel 601 controls the electric power pump 5 to deliver oil, so that the hydraulic cylinder 305 pushes the universal shaft 306 to rotate, and the second steering angle sensor 309 detects the rotation direction and rotation angle of the universal shaft 306, and transmits them to the ECU control panel 601, thereby controlling the rotation direction and rotation angle of the universal shaft 306;

[0027] A gas spring 311 is installed between the steering handlebar 303 and the handlebar seat 301 so that the height of the steering handlebar 303 can be adjusted by the gas spring 311 according to the height of the operator.

[0028] Furthermore, the right end of the hydraulic cylinder 305 is movably connected to a hydraulic push rod, the right end of the hydraulic push rod is rotatably connected to the front end of the universal shaft 306, an oil storage tank 4 is fixedly installed inside the frame 2, and an electric power steering pump 5 is fixedly installed outside the oil storage tank 4.

[0029] Specifically, the electric power pump 5 delivers the hydraulic oil into the hydraulic cylinder 305 through the oil extraction pipe, and after the hydraulic cylinder 305 drives the hydraulic push rod, the hydraulic oil is returned to the oil storage tank 4, and the universal shaft 306 is driven to rotate by the hydraulic push rod, so that the universal shaft 306 drives the transmission connecting rod 307 to move.

[0030] Furthermore, the reset switch assembly 310 includes a first reset switch 3101 and a second reset switch 3102, both of which are located on the rear side of the transmission connecting rod 307, and the micro-spring 308 is provided with a touch head on the outside, and the first reset switch 3101 and the second reset switch 3102 are provided with a sensing module on the side facing the micro-spring 308.

[0031] Specifically, the transmission connecting rod 307 drives the micro spring 308 to move. When the contact head of the micro spring 308 contacts the sensing module of the first reset switch 3101, the steering wheel 7 deflects to the right, and the forklift body 1 turns to the right. After receiving the contact signal, the sensing module of the first reset switch 3101 transmits the signal to the ECU control panel 601, and after judging that the forklift body 1 has completed the right turn, the hydraulic cylinder 305 is controlled to push the universal shaft 306 to rotate, so that the forklift body 1 automatically returns to the right position after turning.

[0032] When the contact head of the micro-spring 308 contacts the sensing module of the second reset switch 3102, the steering wheel 7 deflects to the left, and the forklift body 1 turns left. After receiving the contact signal, the sensing module of the second reset switch 3102 transmits the signal to the ECU control panel 601, and after determining that the forklift body 1 has completed the left turn, the hydraulic cylinder 305 is controlled to push the universal shaft 306 to rotate, so that the forklift body 1 automatically returns to the straight position after turning.

[0033] Furthermore, an operation control system 6 is provided on the outside of the steering handlebar 303, and the operation control system 6 includes an ECU control panel 601 fixedly installed on the top of the steering handlebar 303, and a controller 602 is fixedly installed on the back of the frame 2, and the electric power pump 5 and the controller 602 are both electrically connected to the ECU control panel 601.

[0034] Specifically, the ECU control panel 601 is also provided with lights, low, medium and high speed, forward, reverse, up, down, forward and backward buttons, and also has a power display function. The steering handlebar 303 is also provided with a horn button, a brake handle and a speed handle. Turning the speed handle realizes the rotation of the two driving wheels 803.

[0035] Furthermore, a bogie is fixedly connected to the bottom of the universal joint 306, a steering wheel 7 is fixedly installed on the inner side of the bogie, photoelectric coupling elements are arranged inside the first steering angle sensor 304 and the second steering angle sensor 309, both photoelectric coupling elements are connected to the ECU control panel 601 signal, a brake assembly 8 is arranged outside the frame 2, the brake assembly 8 includes a brake handle 801 arranged on the top of the rear side of the steering handlebar 303, and the brake handle 801 is electrically connected to the controller 602.

[0036] Specifically, the bogie is driven to rotate by the universal shaft 306, so that the steering wheel 7 is deflected. The first steering angle sensor 304 and the second steering angle sensor 309 are both composed of a coil group, a coil support and a coupler element. The coil group includes a transmitter coil and at least one receiver coil. The coupler element has a coupler angular position related to the angular position of the shaft, and can accurately detect the rotation angle and rotation direction of the handlebar steering shaft 302 and the universal shaft 306;

[0037] When the sensor is working, the inductive coupling between the transmitter coil and the receiver coil in the coil group will change due to the movement of the coupler element. The signal processing circuit receives the coil signal and the reference signal from the coil group and determines the angular position and direction of the shaft by analyzing these signals.

[0038] Furthermore, an electric push rod 802 is fixedly installed on the top left side of the frame 2, and a brake line is fixedly connected to the top of the electric push rod 802. Two driving wheels 803 are movably installed on the left bottom of the frame 2. Brake pads 804 are movably connected to the inner sides of the two driving wheels 803, and one end of the brake line is connected to the two brake pads 804.

[0039] Specifically, a switch is provided in the brake handle 801. When the brake handle 801 is squeezed, the controller 602 controls the movement of the electric push rod 802. The electric push rod 802 eventually pulls the brake line and controls the two brake pads 804 to clamp the two driving wheels 803 respectively to achieve the braking effect on the driving wheels 803. The electric push rod 802 is used to achieve the braking effect, so that the braking process is relatively smooth, avoiding the forklift from tipping over due to sudden braking.

[0040] Furthermore, a lifting assembly 9 is provided on the left side of the frame 2, and the lifting assembly 9 includes a gantry 901 movably mounted on the left side of the frame 2, a landing gear 902 is slidably connected to the left side of the gantry 901, a first hydraulic cylinder 903 is fixedly mounted inside the frame 2, and a second hydraulic cylinder 904 is fixedly mounted on the inner side of the gantry 901.

[0041] Specifically, the bottom of the first hydraulic cylinder 903 is arranged inside the frame 2, and the top of the first hydraulic cylinder 903 is connected to the front and rear sides of the gantry 901. When the first hydraulic cylinder 903 drives the push rod to rise, the gantry 901 is tilted forward; the first hydraulic cylinder 903 drives the push rod to descend, and the gantry 901 is tilted backward. When the second hydraulic cylinder 904 drives the push rod to rise, the landing gear 902 is raised, and the second hydraulic cylinder 904 drives the push rod to descend, and the landing gear 902 is lowered.

[0042] Furthermore, a battery 10 is provided in the frame 2 , and square tubes 11 with grooves are fixedly mounted at both ends of the rear side of the frame 2 , and pedals 12 are mounted on the square tubes 11 .

[0043] Specifically, the steering wheel 7 and the driving wheel 803 both adopt a solid wheel structure. Compared with traditional tires, the solid wheel allows the forklift to adapt to more scenarios and has stronger durability. In addition, one or two steering wheels 7 can be installed according to the weight of the forklift. The battery 10 is used to power the entire forklift. A groove is opened on each square tube 11, and a foot pedal 12 is installed in the groove. When the foot pedal 12 is in use, it is stuck by the bottom of the groove; the operator stands on the foot pedal 12 to operate the forklift. A counterweight iron is arranged in the frame 2. The counterweight iron ensures that the forklift can lift the corresponding load and maintain sufficient adhesion between the forklift and the ground to ensure that the forklift can travel and turn normally.

[0044] In summary, the stand-up forklift with hydraulic power steering drives the handlebar steering shaft 302 by rotating the steering handlebar 303, and the ECU control panel 601 detects the rotation angle and direction of the handlebar steering shaft 302 and the universal shaft 306 through the first steering angle sensor 304 and the second steering angle sensor 309 respectively, and then the ECU control panel 601 controls the electric power pump 5 to deliver oil to the hydraulic cylinder 305, pushing the universal shaft 306 to rotate, so that the steering wheel 7 can be adjusted left and right. At the same time, when the touch head of the micro-spring 308 contacts the touch modules of the first reset switch 3101 and the second reset switch 3102 respectively, the ECU control panel 601 controls the hydraulic cylinder 305 to push the universal shaft 306 to rotate, so that the forklift body 1 automatically returns to the straight position after turning, thereby achieving the effect of hydraulic power turning of the forklift body 1.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stand-on forklift with hydraulic power steering, comprising a forklift body (1), characterized in that: The inner side of the forklift body (1) is fixedly connected to a frame (2), and a steering drive structure (3) is arranged inside the frame (2); The steering drive structure (3) comprises a handlebar seat (301) fixedly mounted on the top of a frame (2); a handlebar steering shaft (302) is movably mounted on the bottom of the handlebar seat (301); a steering handlebar (303) is fixedly connected to the top of the handlebar steering shaft (302); a first steering angle sensor (304) is fixedly connected to the bottom of the handlebar steering shaft (302); a hydraulic cylinder (305) is fixedly mounted inside the frame (2); and the frame (2 ) is movably installed inside the frame (2), a universal shaft (306) is rotatably connected to a transmission connecting rod (307) at the top rear end of the universal shaft (306), a micro spring (308) is sleeved on the outer side of the transmission connecting rod (307), a second steering angle sensor (309) is fixedly connected to the top of the universal shaft (306), a reset switch assembly (310) is fixedly installed inside the frame (2), and a gas spring (311) is arranged on the top of the handlebar seat (301).

2. A stand-on forklift with hydraulic power steering according to claim 1, characterized in that: The right end of the hydraulic cylinder (305) is movably connected to a hydraulic push rod, and the right end of the hydraulic push rod is rotatably connected to the front end of the universal shaft (306). An oil storage tank (4) is fixedly installed inside the frame (2), and an electric power booster pump (5) is fixedly installed outside the oil storage tank (4).

3. A stand-on forklift with hydraulic power steering according to claim 1, characterized in that: The reset switch assembly (310) comprises a first reset switch (3101) and a second reset switch (3102), wherein the first reset switch (3101) and the second reset switch (3102) are both located at the rear side of the transmission connecting rod (307), the micro-motion spring (308) is provided with a touch head on the outside, and the first reset switch (3101) and the second reset switch (3102) are both provided with a touch module on the side facing the micro-motion spring (308).

4. A stand-on forklift with hydraulic power steering according to claim 2, characterized in that: An operation control system (6) is arranged outside the steering handlebar (303), and the operation control system (6) comprises an ECU control panel (601) fixedly mounted on the top of the steering handlebar (303). A controller (602) is fixedly mounted on the back of the frame (2), and the electric power steering pump (5) and the controller (602) are both electrically connected to the ECU control panel (601).

5. A stand-on forklift with hydraulic power steering according to claim 4, characterized in that: The bottom of the universal joint (306) is fixedly connected to a bogie, and a steering wheel (7) is fixedly installed on the inner side of the bogie. The first steering angle sensor (304) and the second steering angle sensor (309) are both provided with photoelectric coupling elements inside, and the two photoelectric coupling elements are both connected to the ECU control panel (601) signal. A brake assembly (8) is provided on the outside of the frame (2), and the brake assembly (8) includes a brake handle (801) arranged on the top of the rear side of the steering handlebar (303), and the brake handle (801) is electrically connected to the controller (602).

6. A stand-on forklift with hydraulic power steering according to claim 5, characterized in that: An electric push rod (802) is fixedly installed on the left side of the top of the frame (2), and a brake line is fixedly connected to the top of the electric push rod (802). Two driving wheels (803) are movably installed on the bottom of the left side of the frame (2), and brake pads (804) are movably connected to the inner sides of the two driving wheels (803), and one end of the brake line is connected to the two brake pads (804).

7. A stand-on forklift with hydraulic power steering according to claim 1, characterized in that: A lifting assembly (9) is arranged on the left side of the frame (2), and the lifting assembly (9) comprises a gantry (901) movably mounted on the left side of the frame (2), a landing gear (902) is slidably connected to the left side of the gantry (901), a first hydraulic cylinder (903) is fixedly mounted inside the frame (2), and a second hydraulic cylinder (904) is fixedly mounted on the inner side of the gantry (901).

8. A stand-on forklift with hydraulic power steering according to claim 1, characterized in that: A battery (10) is arranged in the frame (2), and square tubes (11) with grooves are fixedly mounted at both ends of the rear side of the frame (2), and a foot pedal (12) is mounted on the square tube (11).

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