A lifting hatch detection device

Abstract

The application discloses a lifting cabin door detection device, which comprises a swing floor and a casing, the upper end of the casing is fixed on the swing floor, the swing floor is provided with an upper and lower through opening, a detection plate assembly is movably installed at the opening, the detection plate assembly is connected with an elastic device capable of driving the detection plate assembly to rise upward by elastic force, the casing is provided with a limiting piece capable of limiting the maximum height of the upward rising of the detection plate assembly, the casing is further provided with a driving device capable of driving the limiting piece to move to adjust the maximum height of the upward rising of the detection plate assembly, and the casing is provided with a detection element capable of monitoring the height position of the detection plate assembly or the upper surface of the detection plate assembly is provided with a safety boot. The application can convert the original manual operation of the lifting cabin door detection device into an electric control operation mode, and can meet the requirements of the unmanned operation of the boarding bridge.

Description

Technical Field

[0001] This invention relates to the field of boarding bridge technology, and in particular to a lifting cabin door detection device. Background Technology

[0002] When connecting the boarding bridge to the aircraft, the swing floor at the front of the arrival gate needs to be adjusted to be roughly parallel to the aircraft door, with a distance of 15-20 cm. The arrival gate canopy will then automatically align with the fuselage surface, and the automatic leveling mechanism will extend and engage with the aircraft. While the boarding bridge is in automatic leveling mode, the operator places a safety shoe under the open aircraft door to detect any uncontrolled movement between the aircraft and the boarding bridge that could cause the aircraft door to rapidly approach the bridge floor, such as a tire blowout, leading to an unexpected descent of the aircraft fuselage and door. In automatic leveling mode, the aircraft door protection function is activated. If uncontrolled movement occurs and the speed at which the door and safety shoe approach each other exceeds the automatic leveling range, the safety shoe will be triggered, and the boarding bridge will descend rapidly to prevent the aircraft door from colliding with the arrival gate floor, thus preventing damage to the aircraft door from an unexpected descent during arrival.

[0003] With the rise of airport demand for automated boarding bridges, which require fully automated, unmanned boarding bridges, the placement of safety boots can no longer be done manually. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a lifting hatch detection device that can detect the position of the hatch without manual placement.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows:

[0006] A lifting door detection device includes a swing floor and a housing. The upper end of the housing is fixed to the swing floor. The swing floor has a through-hole. A detection plate assembly is movably installed at the through-hole. The detection plate assembly is connected to a spring device that can be driven to rise by elastic force. A limiting member is provided inside the housing to limit the maximum height of the detection plate assembly. A driving device is also installed on the housing to drive the limiting member to move and adjust the maximum height of the detection plate assembly. A detection element is provided inside the housing to monitor the height position of the detection plate assembly, or a safety boot is provided on the upper surface of the detection plate assembly.

[0007] In a preferred embodiment of the present invention, the detection plate assembly includes a top plate and a connecting sleeve fixed to the lower surface of the top plate. The limiting member is located inside the connecting sleeve and can move up and down relative to the connecting sleeve. The lower end of the connecting sleeve has an end plate that can abut against the limiting member.

[0008] In a preferred embodiment of the present invention, a guide post is fixed inside the housing, and a guide sleeve that mates with the guide post is fixed on the lower surface of the top plate. The detection element is used to monitor the positional change of the guide sleeve.

[0009] In a preferred embodiment of the present invention, the elastic device includes a spring sleeved on the guide post, the upper end of the spring abutting against the lower end face of the guide sleeve, and the lower end of the spring abutting against the inner bottom surface of the housing.

[0010] In a preferred embodiment of the present invention, the end plate is provided with a through hole, the limiting member is connected to a pull rod that passes downward through the through hole, the driving device includes a motor disposed in the housing, the motor is connected to a reducer, the output shaft of the reducer is connected to the pull rod through a lead screw pair or a gear rack pair, and the housing is provided with an upper limit switch that can limit the maximum stroke of the pull rod moving upward and a lower limit switch that can limit the maximum stroke of the pull rod moving downward.

[0011] In a preferred embodiment of the present invention, the detection element is mounted on the end plate and is used to monitor the distance change between the limiting member and the end plate, and a spring is provided between the limiting member and the end plate that can drive them to move away from each other by elastic force.

[0012] In a preferred embodiment of the present invention, a fixed bracket is provided inside the housing, and the elastic device is a nitrogen spring connected between the top plate and the fixed bracket.

[0013] In a preferred embodiment of the present invention, the end plate is provided with a through hole, the limiting member is connected to a chain passing downward through the through hole, a sprocket meshing with the chain is rotatably installed inside the housing, the driving device includes a motor disposed inside the housing, the motor is connected to a reducer, and the output shaft of the reducer is connected to the sprocket through a worm gear pair.

[0014] In a preferred embodiment of the present invention, the chain is a unidirectional bending chain, a horizontal guide groove is provided inside the housing, the lower part of the chain is slidably installed in the guide groove, and a compression spring capable of driving the tail end of the chain to move left and right in the guide groove is installed in the guide groove.

[0015] In a preferred embodiment of the present invention, the detection plate assembly includes a top plate and a lifting frame fixed to the lower surface of the top plate. A motor bracket and a scissor arm are disposed inside the housing. The lifting frame is provided with a horizontal second guide groove, and the motor bracket is provided with a horizontal first guide groove. The scissor arm includes a first connecting rod and a second connecting rod. The middle part of the first connecting rod and the middle part of the second connecting rod are hinged to form an X-shaped structure. The upper end of the first connecting rod is hinged to the lifting frame. The lower end of the first connecting rod is connected to a first movable member that can move along the first guide groove. The lower end of the second connecting rod is hinged to the motor bracket. The upper end of the second connecting rod is connected to a second movable member that can move along the second guide groove. The elastic device is connected to the second movable member to drive it to move toward the upper end of the first connecting rod. The limiting member is movably mounted on the motor bracket and can abut against the first movable member to limit the minimum distance between the first movable member and the lower end of the second connecting rod. The driving device can drive the limiting member to move left and right to adjust the maximum height of the detection plate assembly.

[0016] In a preferred embodiment of the invention, the elastic device is a tension spring capable of driving the second movable member to move toward the upper end of the first connecting rod.

[0017] In a preferred embodiment of the present invention, both the first movable member and the second movable member are rollers.

[0018] In a preferred embodiment of the present invention, the driving device is a geared motor, the output shaft of the geared motor is connected to a horizontally arranged lead screw, and the limiting member is a translational nut that meshes with the lead screw.

[0019] In a preferred embodiment of the present invention, the upper surface of the swing floor is provided with an anti-slip rubber pad.

[0020] In a preferred embodiment of the present invention, the upper surface of the top plate is provided with a cushioning anti-slip pad.

[0021] The beneficial effects of this invention are:

[0022] 1. The main body of the lifting door detection device is installed under the swing floor, which is the same as the normal receiving state and does not hinder the receiving of the aircraft.

[0023] 2. Using an electric method, the detection plate assembly is raised and released from the swing floor, and the lifting door detection device can then switch to the door monitoring working state. The lifting door detection device is kept in the monitoring working state by the elastic force of the spring. When the door is pressed down, the door presses the detection plate assembly down, the spring is compressed, and at the same time the detection element sends an emergency descent command, so that the boarding bridge floor can descend in an emergency to avoid the aircraft door.

[0024] 3. This invention can convert the original manual operation of the lifting door detection device into an electronically controlled operation mode, which can meet the requirements of unmanned operation of the boarding bridge.

[0025] 4. Increased safety distance: The distance an aircraft can sink due to an accident is limited, theoretically calculated as the radius of the aircraft tire minus 32%–35% of the tire's deformation under pressure, minus the radius of the wheel hub. Currently, the safety boots used on boarding bridges are placed directly between the swing floor and the cabin door in a 15–20 cm gap. The safety boots themselves have a certain rigidity and height h. Whether the aircraft experiences an accidental tire blowout or the boarding bridge rises unexpectedly, the cabin door and the floor can eventually come together. The distance at which the cabin door is not damaged by compression is (15–20) – h. The detection plate assembly of the lift-type cabin door detection device or the safety boots on it can sink to a position no higher than the upper surface of the swing floor, greatly increasing the safety distance. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention when the detection board assembly is in the raised state;

[0027] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention when the detection board assembly is in the retracted state;

[0028] Figure 3 This is an exploded view of Embodiment 1 of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention when the detection board assembly is in the retracted state;

[0030] Figure 5 This is a schematic diagram of the structure of Embodiment 3 of the present invention when the detection board assembly is in the raised state;

[0031] Figure 6 This is a schematic diagram of the structure of Embodiment 3 of the present invention when the detection plate assembly is pressed down by the hatch;

[0032] Figure 7 This is a schematic diagram of the chain installation structure in Embodiment 4 of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of Embodiment 5 of the present invention when the detection board assembly is in the raised state;

[0034] Figure 9 This is a schematic diagram of the structure of Embodiment 5 of the present invention when the detection board assembly is in the retracted state. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described in conjunction with the accompanying drawings.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in this invention are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. Furthermore, descriptions involving "preferred," "second-best," etc., in this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "preferred" or "second-best" may explicitly or implicitly include at least one of those features.

[0037] Reference Figures 1 to 9 This invention proposes a lifting door detection device, including a swing floor 1 and a housing 2. The upper end of the housing 2 is fixed to the swing floor 1. The swing floor 1 is provided with a vertically penetrating opening 11. A detection plate assembly 3 is movably installed at the opening 11. The detection plate assembly 3 is connected to a spring device that can drive it to rise upwards by elastic force. A limiting member 41 is provided inside the housing 2 to limit the maximum height of the detection plate assembly 3. A driving device is also installed on the housing 2 to drive the limiting member 41 to move and adjust the maximum height of the detection plate assembly 3. A detection element 5 is provided inside the housing 2 to monitor the height position of the detection plate assembly 3, or a safety boot 6 is provided on the upper surface of the detection plate assembly 3.

[0038] Example 1

[0039] Figures 1 to 3 Embodiment 1 of the present invention is shown. In this embodiment, a detection element 5 capable of monitoring the height position of the detection plate assembly 3 is provided inside the housing 2. The detection plate assembly 3 includes a top plate 31 and a connecting sleeve 32 fixed to the lower surface of the top plate 31. A limiting member 41 is located inside the connecting sleeve 32 and can move up and down relative to the connecting sleeve 32. The lower end of the connecting sleeve 32 has an end plate 321 that can abut against the limiting member 41.

[0040] A guide post 21 is fixed inside the housing 2, and a guide sleeve 33 that cooperates with the guide post 21 is fixed on the lower surface of the top plate 31. The two are in sliding or rolling fit. The elastic device includes a spring 101 sleeved on the guide post 21. The upper end of the spring 101 abuts against the lower end face of the guide sleeve 33, and the lower end of the spring 101 abuts against the inner bottom surface of the housing 2.

[0041] The end plate 321 is provided with a through hole, and the limiting member 41 is connected to a pull rod 42 that passes downward through the through hole. The driving device includes a motor 43 installed in the housing 2. The motor 43 is connected to a reducer 44. The output shaft of the reducer 44 is connected to the pull rod 42 through a ball screw pair, a trapezoidal screw pair, or a gear rack pair. The housing 2 is provided with an upper limit switch 201 that can limit the maximum upward movement of the pull rod 42 and a lower limit switch 202 that can limit the maximum downward movement of the pull rod 42.

[0042] The lift-type cabin door detection device is installed on the swing floor 1 at the boarding bridge. A suitable position that can cover the cabin doors of various aircraft types is selected, and the chassis 2, detection plate assembly 3, and related components are all installed at this position. During the automatic boarding bridge boarding process, the detection plate assembly 3 is initially in position... Figure 2 As shown in the retracted state, the swing floor 1, with the cooperation of the horizontal sensor, automatically adjusts to be basically parallel to the bottom edge of the opened aircraft door, and the detection plate assembly 3 is located below the door. Then, the drive device drives the limiting member 41 to move a certain distance, so that the detection plate assembly 3 rises under the action of the spring 101. At this time, the lifting door detection device switches to the aircraft door monitoring and protection working state.

[0043] The upper surface of the swing floor 1 is covered with anti-slip rubber pads 91, and the upper surface of the top plate 31 is covered with cushioning anti-slip rubber pads 92. The flexible rubber pads can avoid the risk of metal scraping against the aircraft.

[0044] When the aircraft is not docked, the lift-type cabin door detection device is in the lowered and retracted state. When the boarding bridge docks the aircraft, the canopy automatically moves up to the fuselage after the front edge of the docking gate floor is aligned with the aircraft, and the flight attendant manually opens the cabin door.

[0045] Under the action of spring 101, the bottom end of the connecting sleeve 32 of the detection plate assembly 3 always remains in contact with the limiting member 41. When the motor 43 drives the pull rod 42 and the limiting member 41 to rise slowly together, the detection plate assembly 3 will also rise under the elastic force of spring 101. When the upper limit switch 201 of the pull rod 42 sends a signal, the motor 43 stops rotating, the detection plate assembly 3 reaches the working position and enters the working state.

[0046] At this time, the position of the detection board assembly 3 will be monitored by the detection element 5, which can be a proximity sensor, photoelectric sensor, micro switch, or limit switch.

[0047] When the cabin door descends unexpectedly, the lifting speed controlled by the automatic leveling mechanism can no longer keep the distance between the cabin door and the swing floor 1 relatively stable. At this time, the cabin door will hit the detection plate assembly 3, which will compress the spring 101 and sink. The detection element 5 will send a triggered signal, and then the boarding bridge control system will send a rapid descent command to the boarding bridge lifting system to drive the boarding bridge to descend urgently to avoid the cabin door hitting the boarding bridge floor and being damaged.

[0048] After the boarding bridge completes the aircraft docking task, the motor 43 drives the pull rod 42 to move down. The limit piece 41 at the top of the pull rod 42 will pull the connecting sleeve 32 and the top plate 31 down, overcoming the force of the spring 101, so that the detection plate assembly 3 descends. When the pull rod 42 reaches the lower limit switch 202, the detection plate assembly 3 is retracted into place, and the motor 43 is de-energized and stops working.

[0049] In this embodiment, the detection element 5 is located next to the guide sleeve 33 and is used to detect changes in the position of the guide sleeve 33.

[0050] The sensitivity of the sensing can be increased by using a self-lubricating bushing or a linear bearing to match the guide post 21 and the guide sleeve 33.

[0051] Example 2

[0052] Figure 4 Embodiment 2 of the present invention is shown. This embodiment has a similar structure to Embodiment 1, but differs from Embodiment 1 in the following two aspects.

[0053] 1. In this embodiment, the size of the connecting sleeve 32 is increased, and the detection element 5 is set on the end plate 321 at the lower end of the connecting sleeve 32. Under normal circumstances, the limiting member 41 is always in contact with the end plate 321 under the force of the spring 101, and the detection plate assembly 3 is in the working state when it is raised. If it is pressed down by the hatch, it will be pressed down, and the limiting member 41 will disengage from the end plate 321 of the connecting sleeve 32. The detection element 5 can be installed here to detect the occurrence of unexpected situations. 2. In this embodiment, a linear guide rail can be used to replace the guide post 21 and the guide sleeve 33. The linear guide rail is fixed on both sides of the housing 2, and the detection plate assembly 3 is connected to the slider.

[0054] The advantages of this embodiment and Embodiment 1 are:

[0055] 1. The main body of the lifting door detection device is installed under the swing floor 1, which is the same as the normal receiving state and does not hinder the receiving of the aircraft.

[0056] 2. Using an electric method, the detection plate assembly 3 is raised and released from the swing floor 1, and the lifting door detection device can be switched to the door monitoring working state. The lifting door detection device is kept in the monitoring working state by the elastic force of the spring 101. When the door is pressed down, the door presses the detection plate assembly 3 down, the spring 101 is compressed, and at the same time the detection element 5 issues an emergency descent command, so that the boarding bridge floor can descend in an emergency to avoid the aircraft door.

[0057] 3. This invention can convert the original manual operation of the lifting door detection device into an electronically controlled operation mode, which can meet the requirements of unmanned operation of the boarding bridge.

[0058] 4. Increased safety distance: The distance an aircraft can sink due to an accident is limited, theoretically calculated as the radius of the aircraft tire minus 32%–35% of the tire's deformation under pressure, minus the radius of the wheel hub. Currently, the safety boot 6 used on the boarding bridge is placed directly between the swing floor 1 and the cabin door in a 15–20 cm gap. The safety boot 6 itself has a certain rigidity height h. Whether the aircraft experiences an accidental tire blowout or the boarding bridge rises unexpectedly, the cabin door and the floor can eventually come together. The distance at which the cabin door is not damaged by compression is (15–20)–h. The detection plate assembly 3 of the lifting cabin door detection device can sink to the same height as the swing floor 1, greatly increasing the safety distance.

[0059] Example 3

[0060] Figure 5 and Figure 6 Embodiment 3 of the present invention is shown. This embodiment has a similar structure to Embodiment 2, but differs from Embodiment 2 in the following two aspects.

[0061] 1. A fixed bracket 22 is installed inside the housing 2. The elastic device is a nitrogen spring 102 connected between the top plate 31 and the fixed bracket 22. The gas spring 101 provides the force for the upward movement of the detection plate assembly 3, and its cylinder and piston cylinder also have a guiding function. 2. A through hole is provided on the end plate 321. A chain 71 passing downward through the through hole is connected to the limiting member 41. A sprocket 72 that meshes with the chain 71 is rotatably installed inside the housing 2. The drive device includes a motor 43 installed inside the housing 2. The motor 43 is connected to a reducer 44. The output shaft of the reducer 44 is connected to the sprocket 72 through a worm gear pair 45. The release of the detection plate assembly 3 is achieved through a motor 43, a reducer 44, and a worm gear drive. The sprocket 72 is coaxial with the worm gear. The self-locking property of the worm gear drive is used to maintain the state of the chain 71. The motor 43 rotates, which is reduced in speed by the reducer 44, driving the worm to rotate. The worm drives the worm gear and the coaxial sprocket 72 to rotate, which in turn pulls the limiting member 41 up and down through the chain 71, thus realizing the lifting and retraction reset of the detection plate assembly 3.

[0062] In this embodiment, if the detection plate assembly 3 is squeezed downward by the cabin door, the guide block will separate from the detection element 5, and the limiting member 41 will disengage from the end plate 321 of the connecting sleeve 32. At this time, the detection element 5 sends an emergency bridge lowering command to the boarding bridge control system.

[0063] If the chain 71 is a unidirectional bending chain, the chain 71 is restricted by the chain outlet and the guide sleeve 33, and the section of the chain 71 between the guide block and the chain outlet will always remain in a vertical state.

[0064] Chain 71 can also be a regular bidirectional chain 71 or a wire rope to complete the raising and lowering of the hatch detection plate, and sprocket 72 can be replaced with a wire rope roller.

[0065] To ensure that the detection element 5 can accurately and instantly detect the function of the hatch, a spring 101 for separation can be added between the limiting member 41 and the end. The detection element 5 can also be a non-contact distance detection photoelectric sensor mounted under the hatch detection plate to directly monitor whether the position of the hatch detection plate changes.

[0066] Example 4

[0067] Figure 7 Embodiment 4 of the present invention is shown. This embodiment has a similar structure to Embodiment 3, but differs from Embodiment 3 in the following point.

[0068] In this embodiment, the chain 71 is a unidirectional bending chain, and a horizontal guide groove 23 is provided inside the housing 2. The lower part of the chain 71 is slidably installed in the guide groove 23, and a compression spring 73 is installed in the guide groove 23 to drive the tail end of the chain 71 to move left and right in the guide groove 23.

[0069] Example 5

[0070] Figure 8 and Figure 9 Embodiment 5 of the present invention is shown.

[0071] In this embodiment, the detection plate assembly 3 includes a top plate 31 and a lifting frame 35 fixed to the lower surface of the top plate 31. A motor bracket 26 and a scissor arm are disposed within the housing 2. The lifting frame 35 has a horizontal second guide groove 351, and the motor bracket 26 has a horizontal first guide groove 261. The scissor arm includes a first connecting rod 81 and a second connecting rod 82. The middle portion of the first connecting rod 81 is hinged to the middle portion of the second connecting rod 82 to form an X-shaped structure. The upper end of the first connecting rod 81 is hinged to the lifting frame 35, and the lower end of the first connecting rod 81 is connected to a first movable member 83 capable of moving along the first guide groove 261. The lower end of the second connecting rod 82 is hinged to the motor bracket 26, and the upper end of the second connecting rod 82 is connected to a second movable member 84 capable of moving along the second guide groove 351. The elastic device is connected to the second movable member 84 to drive it to move toward the upper end of the first link 81. The limiting member 41 is movably mounted on the motor bracket 26 and can abut against the first movable member 83 to limit the minimum distance between the lower end of the first movable member 83 and the second link 82. The driving device can drive the limiting member 41 to move left and right to adjust the maximum height of the detection plate assembly 3 rising.

[0072] Specifically, the elastic device is a tension spring 105 that can drive the second movable part 84 to move toward the upper end of the first connecting rod 81, the driving device is a geared motor 48, the output shaft of the geared motor 48 is connected to a horizontally arranged lead screw 93, and the limiting member 41 is a translational nut that meshes with the lead screw 93.

[0073] The first movable part 83 and the second movable part 84 are preferably rollers, but sliders can also be used.

[0074] Under the elastic force of the tension spring 105, the safety shoe 6 is raised, protruding above the swing floor 1 of the boarding bridge, and directly monitored by the safety edge of the safety shoe 6. When the aircraft door descends, it will press against the safety edge 61 of the safety shoe 6. The safety shoe 6 then sends this signal to the boarding bridge control system, which in turn sends a rapid descent command to the boarding bridge lifting system, driving the boarding bridge to descend urgently to avoid damage to the door from hitting the boarding bridge floor.

[0075] The retraction of the safety boot 6 is achieved by the translation nut and lead screw 93 driven by the geared motor 48. The translation nut moves to the left, pushing the first movable part 83 to the left, which lowers the scissor arm and retracts the safety boot 6 below the upper surface of the floor.

[0076] Compared with Examples 1-4, this example also uses the traditional safety boot 6 as the detection element, requiring almost no changes to the original emergency avoidance procedure of the boarding bridge. At the same time, the overall structure is simpler and more reliable.

[0077] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct or indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A lifting hatch inspection device, characterized in that, The utility model provides a swing floor (1) and the shell (2), the upper end of shell (2) is fixed on swing floor (1), swing floor (1) is provided with the through hole (11) that goes up and down, the movable mounting of detection plate assembly (3) is arranged at through hole (11), detection plate assembly (3) is connected with the elastic force device that can drive it to rise up by elastic force, the limiting piece (41) that can limit the maximum height of detection plate assembly (3) rises up is arranged in shell (2), the driving device that can drive limiting piece (41) moves to adjust the maximum height of detection plate assembly (3) rises up is also installed on shell (2), the detection element (5) that can monitor the height position of detection plate assembly (3) is arranged in shell (2) or the upper surface of detection plate assembly (3) is provided with safety boot (6); Detection plate assembly (3) includes top plate (31), connecting sleeve (32) is fixed on the lower surface of top plate (31), limiting piece (41) is located inside connecting sleeve (32) and can move up and down relative to connecting sleeve (32), the lower end of connecting sleeve (32) has end plate (321) that can abut with limiting piece (41); The guide column (21) is fixed in the shell (2), the lower surface of the top plate (31) is fixed with the guide sleeve (33) matched with the guide column (21), the detection element (5) is used for monitoring the position change of the guide sleeve (33), the elastic force device includes the spring (101) sleeved on the guide column (21), the upper end of the spring (101) abuts with the lower end surface of the guide sleeve (33), the lower end of the spring (101) abuts with the inner bottom surface of the shell (2).

2. The lift hatch inspection device of claim 1, wherein, The end plate (321) is provided with a through hole, the pull rod (42) connected with the limiting piece (41) passes through the through hole downward, the driving device includes the motor (43) arranged in the shell (2), the motor (43) is connected with the speed reducer (44), the output shaft of the speed reducer (44) is connected with the pull rod (42) through a screw pair or a gear pair, the upper limit switch (201) that can limit the maximum stroke of the pull rod (42) moves upward and the lower limit switch (202) that can limit the maximum stroke of the pull rod (42) moves downward are arranged in the shell (2).

3. The lift hatch inspection device of claim 1, wherein, The detection element (5) is installed on the end plate (321) and is used for monitoring the distance change between the limiting piece (41) and the end plate (321), the spring (101) that can drive the two away from each other by elastic force is arranged between the limiting piece (41) and the end plate (321).

4. The lift hatch inspection device of claim 1, wherein, The shell (2) is provided with a fixed support (22), and the elastic force device is a nitrogen spring (102) connected between the top plate (31) and the fixed support (22).

5. The lift hatch inspection device of claim 1, wherein, The end plate (321) is provided with a through hole, the limiting piece (41) is connected with a chain (71) which passes through the through hole downward, a sprocket (72) which is engaged with the chain (71) is rotatably installed in the casing (2), and the driving device comprises a motor (43) arranged in the casing (2), the motor (43) is connected with a speed reducer (44), and the output shaft of the speed reducer (44) is connected with the sprocket (72) through a worm and worm gear pair (45).

6. The lift hatch inspection device of claim 5, wherein, The chain (71) is a one-way curved chain, the inside of the casing (2) is provided with a horizontal guide groove (23), the lower part of the chain (71) is slidingly installed in the guide groove (23), and the guide groove (23) is provided with a compression spring (73) which can drive the tail end of the chain (71) to move left and right in the guide groove (23).

7. The lift hatch inspection device of claim 1, wherein, The detection plate assembly (3) comprises a top plate (31) and a lifting frame (35) fixed to the lower surface of the top plate (31), the casing (2) is provided with a motor support (26) and a scissor arm, the lifting frame (35) is provided with a horizontal second guide groove (351), the motor support (26) is provided with a horizontal first guide groove (261), the scissor arm comprises a first connecting rod (81) and a second connecting rod (82), the middle part of the first connecting rod (81) is hinged to the middle part of the second connecting rod (82) to form an X-shaped structure, the upper end of the first connecting rod (81) is hinged to the lifting frame (35), the lower end of the first connecting rod (81) is connected with a first movable piece (83) which can move along the first guide groove (261), the lower end of the second connecting rod (82) is hinged to the motor support (26), and the upper end of the second connecting rod (82) is connected with a second movable piece (84) which can move along the second guide groove (351); the elastic device is connected with the second movable piece (84) to drive it to move towards the upper end of the first connecting rod (81), the limiting piece (41) is movably installed on the motor support (26) and can abut against the first movable piece (83) to limit the minimum distance between the first movable piece (83) and the lower end of the second connecting rod (82), and the driving device can drive the limiting piece (41) to move left and right to adjust the maximum height at which the detection plate assembly (3) rises upward.

8. The lift hatch inspection device of claim 7, wherein, The elastic device is a tension spring (105) which can drive the second movable piece (84) to move towards the upper end of the first connecting rod (81), the first movable piece (83) and the second movable piece (84) are both rollers, the driving device is a speed reduction motor (48), the output shaft of the speed reduction motor (48) is connected with a horizontally arranged lead screw (93), and the limiting piece (41) is a translational nut which is engaged with the lead screw (93).

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