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EP-4361046-B1 - AUTOMATIC LEVELING DEVICE FOR CONVEYING PLATFORM, AND LOADER

EP4361046B1EP 4361046 B1EP4361046 B1EP 4361046B1EP-4361046-B1

Inventors

  • ZANG, YOUJUN
  • YU, Junbo
  • LI, YUEHUA
  • LIU, HAITAO
  • LIU, YUJUN
  • ZHENG, FEI

Dates

Publication Date
20260506
Application Date
20220907

Claims (16)

  1. A loader, comprising: a chassis (12); and a vehicle PLC controller, wherein the chassis (12) is provided with an automatic leveling device for a conveying platform, and wherein the automatic leveling device for the conveying platform comprises a main platform (1) and a bridge platform (2), wherein there is arranged an automatic leveling mechanism (3) between the main platform (1) and the bridge platform (2); wherein the automatic leveling mechanism (3) comprises at least one baffle (4), a supporting plate (5), a low-level sensor (6), and an aligning sensor (7); wherein the at least one baffle (4) is arranged between the main platform (1) and the bridge platform (2); wherein the supporting plate (5) is arranged on the main platform (1), wherein one end of the supporting plate (5) is fixedly connected with the main platform (1), and wherein another end of the supporting plate (5) is exposed from the main platform (1) and disposed below the baffle (4), wherein the baffle (4) is hinged with the bridge platform (2), wherein two ends of the baffle (4) are free ends, wherein one end of the baffle (4) faces towards the supporting plate (5) and is fixedly provided with the low-level sensor (6); wherein the aligning sensor (7) is arranged between the other end of the baffle (4) and the bridge platform (2), wherein one end of the aligning sensor (7) is fixedly connected with the bridge platform (2), and another end of the aligning sensor (7) is spaced apart from the baffle (4); wherein the main platform (1) and the bridge platform (2) are each connected with the chassis (12) through a lifting mechanism (14); wherein the low-level sensor (6), the aligning sensor (7), and the lifting mechanism (14) are each coupled with the vehicle PLC controller; wherein there is arranged a main platform-bridge platform connecting mechanism (60) between the main platform (1) and the bridge platform (2); wherein the main platform-bridge platform connecting mechanism (60) comprises two connecting frames (61), two connecting plates (62), two connecting rollers (63), and two connecting shafts; wherein two sides of a rear end of the bridge platform (2) each comprise a connecting frame (61); wherein each connecting frame (61) is fixedly connected with the bridge platform (2); wherein each connecting frame (61) comprises a connecting open slot (64), wherein the connecting open slot (64) is arranged to be oriented towards an outside of the bridge platform (2); wherein two sides of a front end of the main platform (1) are each provided with a connecting plate (62), wherein opposite faces of the two connecting plates (62) are each provided with a connecting roller (63); wherein one end of each connecting plate (62) is fixedly connected with the main platform (1), and another end of the connecting plate (62) is provided with a connecting shaft; wherein each connecting shaft is fixedly connected with the corresponding connecting plate (62); wherein the connecting rollers (63) are movably installed on the respective connecting shafts, and wherein in response to the main platform (1) rising to be flush with the bridge platform (2), the connecting rollers (63) are configured to enter the respective connecting open slots (64), and wherein an outer surface of each connecting roller (63) is in an interference connection with a side wall of the respective connecting open slot (64).
  2. The loader according to claim 1, wherein there is arranged a following sensor (9) on one side of the aligning sensor (7), wherein one end of the following sensor (9) is fixedly connected with the bridge platform (2), and wherein another end of the following sensor (9) is arranged to face towards the baffle (4), wherein a height of the following sensor (9) is greater than a height of the aligning sensor (7).
  3. The loader according to claim 1 or 2, wherein there is arranged a high-level sensor (8) on one side of the aligning sensor (7), wherein one end of the high-level sensor (8) is fixedly connected with the bridge platform (2), and another end of the high-level sensor (8) is arranged to face towards the baffle (4), and wherein a height of the high-level sensor (8) is less than the height of the aligning sensor (7).
  4. The loader according to claim 3, wherein there is arranged an ultra-high shutdown protection sensor (10) on one side of the aligning sensor (7), wherein one end of the ultra-high shutdown protection sensor (10) is fixedly connected with the bridge platform (2), and wherein another end of the ultra-high shutdown protection sensor (10) is arranged to face towards the baffle (4), wherein a height of the ultra-high shutdown protection sensor (10) is less than the height of the aligning sensor (7).
  5. The loader according to claim 1 or 2 or 4, wherein there is arranged a baffle lowering sensor (11) on one side of the aligning sensor (7), wherein one end of the baffle lowering sensor (11) is fixedly connected with the bridge platform (2), and wherein another end of the baffle lowering sensor (11) is arranged to face towards the baffle (4), wherein a height of the baffle lowering sensor (11) is higher than the height of the aligning sensor (7).
  6. The loader according to claim 1, wherein the main platform (1) is provided with a conveying motor, a chain, a chain wheel, a conveying roller, a roller shaft, and a motor controller; wherein the bridge platform (2) is provided with a conveying motor, a chain, a chain wheel, a conveying roller, a roller shaft, and a motor controller; wherein the main platform (1) and the bridge platform (2) are each provided with a roller shaft arranged at intervals, wherein two ends of each roller shaft are fixedly connected with the main platform (1) or the bridge platform (2) through a bearing, wherein the conveying roller is mounted on the roller shafts, wherein an output shaft of the conveying motor is connected with respective roller shaft through the chain and the chain wheel, wherein the conveying motor is connected with the motor controller, wherein the conveying motor and the motor controller are fixed on the main platform (1) or the bridge platform (2), and the motor controller is connected with the vehicle PLC controller.
  7. The loader according to claim 1, wherein one side of the bridge platform (2) is provided with an operating board (13), another side of the bridge platform (2) is provided with a bridge platform side-tilting prevention mechanism (16), the bridge platform side-tilting prevention mechanism (16) comprises a hook (17) and a guide supporting plate, the hook (17) is arranged below the other side of the bridge platform (2), a lower end of the hook (17) is hinged with a roller shaft of the lifting mechanism (14) at a lower end of the bridge platform (2), an upper part of the hook (17) is provided with a guide supporting plate facing the roller shaft, an upper end of the guide supporting plate is butted against and slidably connected with the hook (17), and the guide supporting plate is fixedly connected with the bridge platform (2).
  8. The loader according to claim 7, wherein the hook (17) comprises a connecting block (20) and a sliding pole (21), an upper end of the connecting block (20) is provided with the sliding pole (21), a lower end of the connecting block (20) is hinged with the roller shaft, one end of the sliding pole (21) is fixedly connected with the connecting block (20), the other end of the sliding pole (21) is draped on an upper end face of the guide supporting plate (18), and the sliding pole (21) is slidably connected with the guide supporting plate (18).
  9. The loader according to claim 1, wherein one side of the bridge platform (2) is provided with an elevator (22), the elevator (22) comprises an upper ladder (23), a floating ladder (24) and a lower ladder (25), the upper ladder (23) is fixedly connected with the bridge platform (2), two sides of a lower part of the upper ladder (23) are respectively provided with a hanging plate (26), the hanging plate (26) is fixedly connected with the upper ladder (23), and a hanging groove (27) with an upward opening is formed between the hanging plate (26) and the upper ladder (23), two sides of a lower end of the upper ladder (23) are respectively provided with a pressing block (28), the pressing block (28) is located below the hanging plate (26), one end of the pressing block (28) is fixedly connected with the upper ladder (23), the other end of the pressing block (28) is arranged outside the upper ladder (23) to form a pressing end, one side of the upper ladder (23) far from the bridge platform (2) is provided with the floating ladder (24) and the lower ladder (25) at intervals, the lower ladder (25) is fixedly connected with the chassis (12), ladder slideways (29) are fixedly arranged on both sides of an upper part of the lower ladder (25), the floating ladder (24) is located between the upper ladder (23) and the lower ladder (25), the floating ladder (24) is slidably connected with the lower ladder (25) through the ladder slideways (29), two sides of an upper end of the floating ladder (24) are respectively provided with a clamping hook plate (30), two sides of a lower end of the floating ladder (24) are respectively provided with a stopping block (31), one end of the clamping hook plate (30) is fixedly connected with the floating ladder (24), the other end of the clamping hook plate (30) extends to a direction of the upper ladder (23) to form a hanging end, the clamping hook plate (30) is clamped into the hanging groove (27) to connect the floating ladder (24) with the upper ladder (23), one end of the stopping block (31) is fixedly connected with the floating ladder (24), the other end of the stopping block (31) extends to the direction of the upper ladder (23) to form a bearing end, the upper ladder (23) is downward, and the pressing block (28) is pressed on the stopping block (31) to drive the floating ladder (24) to descend.
  10. The loader according to claim 9, wherein a fixed mounting frame (32) is arranged between the upper ladder (23) and the bridge platform (2), one end of the fixed mounting frame (32) is fixedly connected with the upper ladder (23), the other end of the fixed mounting frame (32) is fixedly connected with the bridge platform (2), two sides of the lower ladder (25) are respectively provided with a fixed supporting frame (33), one end of the fixed supporting frame (33) is fixedly connected with the lower ladder (25) and the other end of the fixed supporting frame (33) is fixedly connected with the chassis (12).
  11. The loader according to claim 1, wherein the bridge platform (2) is provided with a rotary guardrail (39), the rotary guardrail (39) is rotatably connected with the bridge platform (2), a guardrail rotation detection mechanism (45) is arranged between the rotary guardrail (39) and the bridge platform (2), the guardrail rotation detection mechanism (45) comprises an inductor (46) and a sensing plate (47), the inductor (46) is arranged below the rotary guardrail (39), the sensing plate (47) is arranged on the rotary guardrail (39), a lower end of the inductor (46) is fixedly connected with the bridge platform (2), the inductor (46) is connected with the vehicle PLC controller, the sensing plate (47) is fixedly connected with the rotary guardrail (39), and when the rotary guardrail (39) rotates to a rear part of the bridge platform (2), the sensing plate (47) is located above the inductor (46) and induced by the inductor (46).
  12. The loader according to claim 11, wherein the rotary guardrail (39) is provided with a movable guardrail (50), the movable guardrail (50) is slidably connected with the rotary guardrail (39), and the movable guardrail (50) is limited and fixed with the rotary guardrail (39) through a positioning pin (52).
  13. The loader according to claim 12, wherein a movable guardrail support guide sliding mechanism (53) is arranged below the movable guardrail (50), and the movable guardrail support guide sliding mechanism (53) comprises a supporting roller (54), a supporting roller shaft (55) and a supporting roller seat (56), an upper end face of the supporting roller (54) butts against a lower end face of the movable guardrail (50), the supporting roller (54) is movably mounted on the supporting roller shaft (55), the supporting roller shaft (55) is installed on the supporting roller seat (56), and the supporting roller seat (56) is fixedly connected with the rotary guardrail (39) through a bracket.
  14. The loader according to claim 12 or 13, wherein the rotary guardrail (39) is provided with a movable guardrail downward-pressing guide mechanism (57), the movable guardrail downward-pressing guide mechanism (57) comprises a guide roller (58) and a guide roller shaft, the rotary guardrail (39) is fixedly provided with a guardrail slideway, the movable guardrail (50) comprises a guardrail rod (59), the guardrail rod (59) is arranged in the guardrail slideway and slidably connected with the rotary guardrail (39), the guide roller shaft is arranged above the guardrail rod (59), the guide roller (58) is movably mounted on the guide roller shaft, a lower end face of the guide roller (58) butts against an upper end face of the guardrail rod (59), and the guide roller (58) shaft is fixedly connected with the rotary guardrail (39).
  15. The loader according to claim 11 or 12 or 13, wherein the rotary guardrail (39) comprises a guardrail frame (42), a rotating rod (43) and a supporting rod (44), a front side of the guardrail frame (42) is provided with the supporting rod (44), a rear side of the guardrail frame (42) is provided with the rotating rod (43), an upper part of the rotating rod (43) is fixedly connected with the guardrail frame (42), a lower end of the rotating rod (43) is rotatably connected with the bridge platform (2), an upper end of the supporting rod (44) is fixedly connected with the guardrail frame (42), a lower end of the supporting rod (44) is arranged below the guardrail frame (42), a bolt (41) is arranged on the supporting rod (44), a side edge of the bridge platform (2) is provided with a first rod hole, the rear end of the bridge platform (2) is provided with a second rod hole, the bolt (41) cooperates with the first rod hole to fix the guardrail frame (42) at the side edge of the bridge platform (2), and the bolt (41) cooperates with the second rod hole to fix the guardrail frame (42) at a rear end of the bridge platform (2).
  16. The loader according to claim 15, wherein the bridge platform (2) is provided with a rotating rod jack, and a lower end of the rotating rod (43) is arranged in the rotating rod jack and movably connected with the bridge platform (2).

Description

TECHNICAL FIELD The present invention relates to the technical field of airport ground equipment, and particularly to an automatic leveling device for the conveying platform and a loader. BACKGROUND OF THE PRESENT INVENTION Container cargo loaders are widely used in major airports. The existing loader generally comprises a chassis, a vehicle PLC controller, a lithium battery power device and a drive motor. The vehicle PLC controller is used to control operation of an electric airport container cargo loader. The chassis is connected with a front axle and a conveying platform which comprises a main platform and a bridge platform. The main platform is provided with a conveying motor, a chain, a conveying roller and a motor controller. The bridge platform is provided with a conveying motor, a chain, a conveying roller and a motor controller. The main platform is docked with the bridge platform to complete cargo conveying. China patent CN214059744U discloses an electric aircraft container lifting platform vehicle, which comprises a frame, an operating board, a main platform, a bridge platform and a power part. The power part comprises a battery compartment, a main motor, a regenerative motor, a drive motor, a first hydraulic pump, a second auxiliary hydraulic pump, a hydraulic motor and an inverter; the main platform and the bridge platform are respectively provided with a crawler belt and a universal wheel; the bridge platform is fixedly provided with the operating board; the frame is connected with the main platform through a first lifting mechanism; the frame is connected with the bridge platform through a second lifting mechanism; the first lifting mechanism drives the bridge platform to move up and down; and the second lifting mechanism drives the bridge platform to move up and down. When in use, the first lifting mechanism of the main platform lifts the main platform to the same height as the bridge platform, and docks the main platform with the bridge platform, thus realizing cargo conveying. The above patent has the following shortcomings compared with the prior art. 1. The main platform and the bridge platform may be docked only after being lifted to the same height through the lifting mechanism, but the heights of the main platform and the bridge platform needs to be adjusted many times to be the same, which is time-consuming and laborious, and indirectly leads to the low cargo conveying velocity. 2. When the heights of the main platform and the bridge platform are inconsistent, the cargo conveying will be easily stuck, which will affect the conveying efficiency and may even throw the cargo out. 3. If there is no limit during the lifting of the main platform, the rising velocity is too fast, and the main platform may overturn the bridge platform and hit a plane. 4. The operating board in the above patent is arranged on one side of the bridge platform, which causes a center of gravity of the bridge platform to shift, and is easy to tilt to the operating board side, and even has the risk of rollover. 5. There is no elevator in the above-mentioned patent; when the bridge platform rises, an operator cannot get off the operating board or enter the bridge platform, and the operator can only get in and out of the operating board or the bridge platform when the bridge platform falls completely, but there may be problems when the cargoes are docked, which requires the operator to check in time, and is very inconvenient. 6. A fixed guardrail is usually installed on the bridge platform to prevent the cargo from slipping out from the side far away from the operating board; however, the existing fixed guardrail lacks a detection mechanism, and the operator occasionally forgets that the guardrail does not rotate to a rear of the bridge platform, and the loader starts to run; when the loader is docked with a plane or other equipment, the guardrail is easy to hit the plane or other equipment, which is unsafe to operate. 7. When the bridge platform is docked with the main platform for cargo conveying, the bridge platform may swing left and right, resulting in unstable cargo conveying, and it may be necessary to adjust the cargo several times. D1 (US 4 886 413 A) discloses interface control for controlling the altitude of two roll planes (14,18) of a deck surface relative to each other and providing cooperation with a stop (46,48) that precludes the lowering of one of the roll planes when a load is in position on the deck surface. D2 (US 3 666 127 A) discloses an aircraft cargo-handling vehicle has an elevatable platform adapted to be raised approximately to the level of the sill of the aircraft cargo door, said platform being provided with a transfer bridge so connected to the platform that it can be extended from the platform to the aircraft sill for supporting the forward end of the platform during the loading and unloading operation. D3 (US4 304 518 A) discloses an aircraft loader having bridge and main elevators is