Anti-rollover device of electric forklift

Abstract

The utility model relates to the field of electric forklifts, in particular to an anti-rollover device of an electric forklift, which comprises a forklift body. The device further comprises a sliding frame, a first motor, a two-way lead screw, a first sliding block, a clamping plate, a balancing weight, a horizontal sensor and a controller. By arranging the first motor, the first motor drives the two-way lead screw to rotate during operation, the two first sliding blocks are driven to move relatively during rotation of the two-way lead screw, the two clamping plates are driven to move relatively during movement of the first sliding blocks, and the two clamping plates can clamp the balancing weights when moving to be close to each other, so that the left side and the right side of the forklift body are each provided with one balancing weight; the horizontal sensor can monitor the horizontal state of the forklift body in real time, and when the forklift body inclines laterally, the horizontal sensor can send a signal to the controller, so that the controller starts the first motor close to the inclined face to enable the inclined side to discard the balancing weight, the weight of the inclined side is lower than that of the lifting side, the lifting side can fall down, and therefore the forklift body is prevented from inclining laterally. Therefore, the purpose of supplementing other rollover prevention devices is achieved.

Description

Technical Field

[0001] This utility model relates to the field of electric forklifts, and in particular to an anti-tipping device for electric forklifts. Background Technology

[0002] The anti-rollover device of electric forklifts is a safety protection device that uses sensors and control systems to monitor the forklift's posture in real time and automatically adjust the center of gravity or limit the speed. It is mainly used to prevent the forklift from rolling over due to loss of balance when it is carrying a load, turning, or working on a slope, so as to ensure the safety of personnel and goods and reduce the risk of equipment damage. It is especially suitable for high-load or complex working conditions.

[0003] The existing anti-rollover device's actuation mechanism has a functional bottleneck under critical conditions. When the vehicle's lateral movement exceeds the dynamic stability margin of the anti-rollover device, the anti-rollover device may be in a state of efficiency saturation. Although it can effectively suppress the continuous increase of the roll angle, it cannot complete the final attitude correction due to insufficient actuation redundancy.

[0004] Therefore, given the functional bottleneck of the existing anti-rollover device's actuation mechanism under critical working conditions—which can effectively suppress the continuous increase of the tilt angle but cannot complete the final attitude correction due to insufficient actuation redundancy—there is an urgent need to design a new type of anti-rollover device for electric forklifts. Utility Model Content

[0005] In order to overcome the functional bottleneck of the existing anti-rollover device's actuation mechanism under critical conditions, although it can effectively suppress the continuous increase of the roll angle, it cannot complete the final attitude correction due to insufficient actuation redundancy.

[0006] The technical solution of this utility model is as follows: an anti-tipping device for an electric forklift, including a forklift body; it also includes a sliding frame, a motor, a double-acting screw, a slider, a clamping plate, a counterweight, a level sensor, and a controller. Sliding frames are provided on the left and right rear sides of the lower surface of the forklift body. A motor is installed on the right side of the front surface of the sliding frame. The output end of the motor passes through the front surface of the sliding frame and is connected to the double-acting screw. The rear surface of the double-acting screw is rotatably connected to the inner rear surface of the sliding frame. The outer surface of the double-acting screw is threaded with symmetrical sliders. A clamping plate is installed on the left surface of each slider. A counterweight is provided between the two clamping plates. A level sensor is provided on the front side of the upper surface of the forklift body. A controller is installed on the rear side of the upper surface of the forklift body.

[0007] Preferably, by setting up a motor, the motor drives a double-acting lead screw to rotate. When the double-acting lead screw rotates, the rotation of two sliders is restricted by a sliding frame, thereby causing the two sliders to move relative to each other. As the sliders move, they cause two clamping plates to move relative to each other. When the two clamping plates move closer together, they can clamp the counterweight, thus ensuring that there is a counterweight on each side of the forklift body. By setting up a level sensor (model SLC3300), the level status of the forklift body can be monitored in real time. When the forklift body tilts, the level sensor... It sends a signal to the controller, causing the controller to activate the motor near the tilting surface, so that the counterweight on the tilting side is discarded. As a result, the weight on the tilting side is lower than that on the lifting side, allowing the lifting side to fall. This is to supplement other anti-rollover devices and solve the problem that the existing anti-rollover device's actuation mechanism has a functional bottleneck under critical conditions. When the vehicle's tilting motion exceeds the dynamic stability margin of the anti-rollover device, the anti-rollover device may be in a state of efficiency saturation. Although it can effectively suppress the continuous increase of the tilt angle, it cannot complete the final attitude correction due to insufficient actuation redundancy.

[0008] Preferably, a limiting rod is provided on the left side of the inner front surface of the sliding frame, and two symmetrical sliders are slidably connected to the outer surface of the limiting rod. The right surfaces of the two sliders are connected to the left surfaces of their corresponding clamping plates.

[0009] Preferably, each of the two clamping plates has a pin at one of the four corners on the side closest to the counterweight, and slots are provided at the four corners on both the front and back sides of the counterweight, with the pins slidingly connected to the slots.

[0010] Preferably, a movable frame is provided on the front side of the lower surface of the forklift body, a motor is installed on the left surface of the movable frame, the output end of the motor is connected to a screw through the left surface of the movable frame, the right surface of the screw is rotatably connected to the inner right surface of the movable frame, a slider is threadedly connected to the outer surface of the screw, and a counterweight plate is installed on the lower surface of the slider.

[0011] Preferably, the lower surface of counterweight plate one is provided with left and right support plates on both sides, and the opposite surfaces of the two support plates are equipped with symmetrical electric push rods. The telescopic ends of the electric push rods pass through the support plates and are connected to counterweight plate two.

[0012] Preferably, slide rails are provided on both the left and right sides of the lower surface of the first counterweight plate, and slide grooves are provided on the upper surfaces of the two second counterweight plates, with the slide rails and slide grooves being slidably connected.

[0013] Preferably, the forklift body has a support rod on each of the left and right sides of its outer surface, and the other end of the support rod is connected to a rubber wheel.

[0014] The beneficial effects of this utility model are:

[0015] 1. By setting up motor one, when motor one is running, it drives a double-acting lead screw to perform helical motion. During the rotation of the double-acting lead screw, relying on the circumferential degree-of-freedom constraint mechanism of the sliding frame on the two sliders one, the rotational kinetic energy of the double-acting lead screw is converted into symmetrical opposite displacements of the two sliders one. When the two sliders one are displaced, they synchronously pull the corresponding side clamping plates through rigid connection to perform closing and opening actions, forming a bidirectional locking state on the counterweight during the clamping stage, ensuring that the counterweight layout on both sides of the forklift body is always symmetrical. By setting up a level sensor, model SLC3300, the level status of the forklift body can be monitored in real time. When the side tilt angle is detected to exceed the safety threshold, the level sensor sends a signal to the controller, triggering the tilting side motor one. The bidirectional lead screw rotates, driving the corresponding side slider to move outward, which in turn releases the clamp from locking the counterweight on the tilted side, thus achieving the directional unloading of the counterweight on that side. After the counterweight mass is dynamically adjusted, the forklift body, based on the principle of gravity balance where the lighter side lifts and the heavier side sinks, causes the lifted side to naturally fall back to a balanced state due to the increase in relative mass. This serves to supplement other anti-rollover devices and solve the functional bottleneck of the existing anti-rollover device's actuation mechanism under critical conditions. When the vehicle's tilting motion exceeds the dynamic stability margin of the anti-rollover device, the anti-rollover device may be in a state of efficiency saturation. Although it can effectively suppress the continuous increase of the tilt angle, it cannot complete the final attitude correction due to insufficient actuation redundancy. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of the anti-tipping device for the electric forklift of this utility model.

[0017] Figure 2 The diagram shown is a schematic representation of the sliding frame structure of the anti-tipping device for the electric forklift of this utility model.

[0018] Figure 3 The diagram shown is a schematic representation of the movable frame structure of the anti-tipping device for the electric forklift of this utility model.

[0019] Figure 4 The diagram shown is a schematic of the anti-tipping device support plate structure of the electric forklift of this utility model.

[0020] Explanation of reference numerals in the attached diagram: 1. Forklift body; 2. Sliding frame; 3. Motor 1; 4. Double-acting lead screw; 5. Slider 1; 6. Clamping plate; 7. Counterweight; 8. Limiting rod; 9. Slider 2; 10. Pin; 11. Slot; 12. Moving frame; 13. Motor 2; 14. Screw; 15. Slider 3; 16. Counterweight plate 1; 17. Support plate; 18. Electric push rod; 19. Counterweight plate 2; 20. Slide rail; 21. Slide groove; 22. Support rod; 23. Rubber wheel; 24. Level sensor; 25. Controller. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please see Figures 1-4 This utility model provides an embodiment of an anti-tipping device for an electric forklift, including a forklift body 1; it also includes a sliding frame 2, a motor 3, a double-acting screw 4, a slider 5, a clamping plate 6, a counterweight 7, a level sensor 24, and a controller 25. Sliding frames 2 are located on the rear left and right sides of the lower surface of the forklift body 1. A motor 3 is mounted on the right side of the front surface of the sliding frame 2. The output end of the motor 3 passes through the front surface of the sliding frame 2 and is connected to the double-acting screw 4. The rear surface of the double-acting screw 4 is rotatably connected to the inner rear surface of the sliding frame 2. A symmetrical slider 5 is threaded onto the outer surface of the double-acting screw 4. A clamping plate 6 is mounted on the left surface of each slider 5, and a counterweight 7 is located between the two clamping plates 6. A level sensor 24 is located on the front side of the upper surface of the forklift body 1, and a controller 25 is mounted on the rear side of the upper surface of the forklift body 1. The controller 25 is activated by setting a level sensor 24 on the upper surface of the forklift body 1. When the motor 3 is running, it drives the double-acting lead screw 4 to rotate. When the double-acting lead screw 4 rotates, it restricts the rotation of the two sliders 5 through the sliding frame 2, thereby causing the two sliders 5 to move relative to each other. When the sliders 5 move, they drive the two clamping plates 6 to move relative to each other. When the two clamping plates 6 move closer to each other, they can clamp the counterweight 7, so that there is always a counterweight 7 on both sides of the forklift body 1. By setting up a level sensor 24, the level sensor 24 model is SLC3300, which can monitor the level status of the forklift body 1 in real time. When the forklift body 1 tilts, the level sensor 24 will send a signal to the controller 25, causing the controller 25 to start the motor 3 close to the tilting surface to drop the counterweight 7 on the tilting side. Thus, the weight on the tilting side is lower than that on the lifting side, allowing the lifting side to fall, thereby achieving the purpose of supplementing other anti-tipping devices.

[0023] Please see Figures 1-3In this embodiment, a limiting rod 8 is provided on the left side of the inner front surface of the sliding frame 2. Two symmetrical sliders 9 are slidably connected to the outer surface of the limiting rod 8. The right surfaces of the two sliders 9 are connected to the left surfaces of their corresponding clamping plates 6. By setting the sliders 9, and since the sliders 9 are connected to the clamping plates 6, the clamping plates 6 move, causing the two sliders 9 to move relative to each other. The limiting rod 8 restricts the degrees of freedom of the two sliders 9, thus providing support for the other side of the two clamping plates 6, thereby enabling the two clamping plates 6 to move more stably. Pins 10 are provided at the four corners of the side of the two clamping plates 6 closest to the counterweight 7. Slots 11 are provided at the four corners of both the front and rear sides of the counterweight 7. The pins 10 are slidably connected to the slots 11. By setting the pins 10, and since the pins 10 are connected to the clamping plates 6, when the two clamping plates 6 clamp the counterweight 7, the pins 10 will insert into the slots 11 on the counterweight 7, thereby achieving stable clamping of the counterweight 7. The purpose is to provide a movable frame 12 on the front side of the lower surface of the forklift body 1. A motor 2 13 is installed on the left surface of the movable frame 12. The output end of the motor 2 13 passes through the left surface of the movable frame 12 and is connected to a screw 14. The right surface of the screw 14 is rotatably connected to the inner right surface of the movable frame 12. A slider 3 15 is threadedly connected to the outer surface of the screw 14. A counterweight plate 16 is installed on the lower surface of the slider 3 15. By setting the motor 2 13, the motor 2 13 drives the screw 14 to rotate when it runs. When the screw 14 rotates, the rotation of the slider 3 15 is restricted by the movable frame 12, thereby driving the slider 3 15 to move. When the slider 3 15 moves, it drives the counterweight plate 16 and its connected parts to move together. When the vehicle tilts, the level sensor 24 will start the motor 2 13 through the controller 25, so that the counterweight plate 16 and its connected parts move together to the lifting side, thereby using the lever principle to adjust the posture of the forklift body 1, thereby achieving the purpose of dynamically adjusting the counterweight.

[0024] Please see Figures 1-4In this embodiment, left and right support plates 17 are provided on the left and right sides of the lower surface of the counterweight plate 16. Symmetrical electric push rods 18 are installed on the opposite surfaces of the two support plates 17. The telescopic ends of the electric push rods 18 pass through the support plates 17 and are connected to the counterweight plate 19. By setting the electric push rods 18, the electric push rods 18 drive the counterweight plate 19 to move, thereby further strengthening the leverage effect and achieving the purpose of assisting the counterweight plate 16 in its work. Slide rails 20 are provided on the left and right sides of the lower surface of the counterweight plate 16, and grooves 21 are opened on the upper surfaces of the two counterweight plates 19. The slide rails 20 and the grooves 21 are slidably connected. By setting the slide rails 20 and the grooves 21, the counterweight plate 19... The counterweight plate 19 is mounted on the slide rail 20 via the slide groove 21, so that the weight of the counterweight plate 19 is borne by the slide rail 20, avoiding the situation where the telescopic end will break due to the weight being applied to the electric push rod 18. This reduces the load on the electric push rod 18. Support rods 22 are provided on both the left and right sides of the outer surface of the forklift body 1. The other end of the support rods 22 is connected to rubber wheels 23. By setting the support rods 22, the support rods 22 use the rubber wheels 23 as the fulcrum, thus providing support for the forklift body 1 on both sides. Furthermore, by setting the rubber wheels 23, the normal movement of the forklift body 1 will not be affected during normal operation, thereby preventing the forklift body 1 from tipping over.

[0025] During operation, slider 29 is connected to clamping plate 6, so the movement of clamping plate 6 causes relative movement of the two sliders 29. Limiting rod 8 restricts the freedom of the two sliders 29, providing support for the other side of clamping plate 6, thus enabling more stable movement of the two clamping plates 6. Pin 10, connected to clamping plate 6, inserts into slot 11 on counterweight 7 when clamping the counterweight 7, thus stably holding the counterweight 7. Motor 213 drives screw 14 to rotate. The rotation of screw 14 restricts the rotation of slider 315 via moving frame 12, causing slider 315 to move. The movement of slider 315 causes counterweight plate 16 and its connected parts to move together. When the vehicle tilts, level sensor 24 activates motor 213 via controller 25. The counterweight plate 16 and its connected parts move together towards the lifting side, thereby using the lever principle to adjust the posture of the forklift body 1, thus achieving the purpose of dynamically adjusting the counterweight. By setting an electric push rod 18, the electric push rod 18 drives the counterweight plate 19 to move when it runs, thereby further strengthening the lever effect, thus achieving the purpose of assisting the counterweight plate 16 in working. By setting a slide rail 20 and a slide groove 21, since the counterweight plate 19 is hung on the slide rail 20 through the slide groove 21, the weight of the counterweight plate 19 is borne by the slide rail 20, avoiding the situation where the telescopic end will break due to the weight being applied to the electric push rod 18, thus achieving the purpose of reducing the load on the electric push rod 18. By setting a support rod 22, the support rod 22 uses rubber wheels 23 as the force point, thus providing support for the forklift body 1 on both sides. Furthermore, by setting rubber wheels 23, the normal walking of the forklift body 1 is not affected during normal operation, thereby preventing the forklift body 1 from tipping over.

[0026] Through the above steps, by setting up motor 3, when motor 3 is running, it drives the bidirectional lead screw 4 to perform helical motion. During the rotation of the bidirectional lead screw 4, relying on the circumferential degree-of-freedom constraint mechanism of the sliding frame 2 on the two sliders 5, the rotational kinetic energy of the bidirectional lead screw 4 is converted into symmetrical opposite displacements of the two sliders 5. When the two sliders 5 are displaced, they synchronously pull the corresponding side clamping plates 6 through rigid connection to perform closing and opening actions, forming a bidirectional locking state on the counterweight 7 during the clamping stage, ensuring that the two sides of the forklift body 1 always maintain a symmetrical counterweight layout. By setting up a level sensor 24, model SLC3300, the level status of the forklift body 1 can be monitored in real time. When the side tilt angle is detected to exceed the safety threshold, the level sensor 24 sends a signal to the controller 25. The tilting motor 3 is triggered, causing the bidirectional lead screw 4 to rotate and drive the corresponding side slider 5 to move outward. This causes the clamping plate 6 to release the lock on the tilting counterweight 7, realizing the directional unloading of the counterweight 7 on that side. After the counterweight mass is dynamically adjusted, the forklift body 1, based on the gravity balance principle of lifting the lighter side and sinking the heavier side, causes the lifted side to naturally fall back to the equilibrium state due to the increase in relative mass. This achieves the purpose of supplementing other anti-rollover devices, solving the functional bottleneck of the existing anti-rollover device's actuation mechanism under critical working conditions. When the vehicle's tilting motion exceeds the dynamic stability margin of the anti-rollover device, the anti-rollover device may be in a state of efficiency saturation. Although it can effectively suppress the continuous increase of the tilt angle, it cannot complete the final attitude correction due to insufficient actuation redundancy.

Claims

1. A roll-over prevention device for an electric fork truck, comprising a fork truck body (1); characterized in that: Also include sliding frame (2), motor one (3), bidirectional screw rod (4), sliding block one (5), clamping plate (6), counterweight (7), horizontal sensor (24) and controller (25), the lower surface of the forklift body (1) left and right sides back are provided with sliding frame (2), the front surface right side of sliding frame (2) is installed with motor one (3), the output end of motor one (3) is connected with bidirectional screw rod (4) penetrating the front surface of sliding frame (2), the rear surface of bidirectional screw rod (4) is rotatably connected with the inside rear surface of sliding frame (2), the outer surface of bidirectional screw rod (4) is screw connected with the front and back symmetry sliding block one (5), the left surface of two sliding block one (5) is installed with clamping plate (6), two clamping plates (6) are provided with counterweight (7) between them, the upper surface front side of forklift body (1) is provided with horizontal sensor (24), the upper surface rear side of forklift body (1) is installed with controller (25).

2. The roll-over prevention device for an electric fork truck according to claim 1, characterized by: The inside front surface left side of sliding frame (2) is provided with limit rod (8), the outer surface of limit rod (8) is slidably connected with front and back symmetry sliding block two (9), the right surface of two sliding block two (9) is connected with the left surface of its corresponding clamping plate (6).

3. The roll-over prevention device for an electric fork truck according to claim 1, characterized by: The side near counterweight (7) of two clamping plates (6) is provided with bolt (10) at four corners, the front and back two sides of counterweight (7) are provided with slot (11) at four corners, bolt (10) is slidably connected with slot (11).

4. The roll-over prevention device for an electric fork truck according to claim 1, characterized by: The lower surface front side of forklift body (1) is provided with moving frame (12), the left surface of moving frame (12) is installed with motor two (13), the output end of motor two (13) is connected with screw rod (14) penetrating the left surface of moving frame (12), the right surface of screw rod (14) is rotatably connected with the inside right surface of moving frame (12), the outer surface of screw rod (14) is screw connected with sliding block three (15), the lower surface of sliding block three (15) is installed with counterweight plate one (16).

5. The roll-over prevention device for an electric fork truck according to claim 4, characterized by: The left and right sides of the lower surface of counterweight plate one (16) are provided with left and right support plates (17), the opposite surfaces of two support plates (17) are installed with front and back symmetry electric push rod (18), the telescopic end of electric push rod (18) is connected with counterweight plate two (19) penetrating support plate (17).

6. The roll-over prevention device for an electric fork truck according to claim 5, characterized by: The left and right sides of the lower surface of counterweight plate one (16) are provided with sliding rail (20), the upper surface of two counterweight plate two (19) is provided with sliding groove (21), sliding rail (20) is slidably connected with sliding groove (21).

7. The roll-over prevention device for an electric fork truck according to claim 1, characterized by: The left and right sides of the outer surface of forklift body (1) are provided with one end of support rod (22), the other end of support rod (22) is connected with rubber wheel (23).

Images