Trolley with mechanical interlocking protection function

Abstract

The invention discloses a trolley with mechanical interlocking protection. The trolley comprises a trolley frame, the running mechanism is used for driving the trolley frame to move; the lifting mechanism is used for driving the ladder frame to ascend or descend; the interlocking mechanism comprises butt joint assemblies, inserting and pulling assemblies and an inserting and pulling driving assembly, the butt joint assemblies are used for allowing the ladder assembly shafts to be inserted, the two inserting and pulling assemblies are symmetrically arranged and located between the two adjacent butt joint assemblies respectively, and the inserting and pulling driving assembly is connected with the two inserting and pulling assemblies and used for driving the two inserting and pulling assemblies to synchronously extend or contract; the plugging assembly can extend and penetrate through the butt-joint assembly and the ladder frame shaft, so that the butt-joint assembly and the ladder frame shaft are in a locked state; and the power supply mechanism is arranged at the bottom of the trolley frame body in a manner of being opposite to the power connection mechanism and is used for being in butt joint with the power connection mechanism and supplying power to the ladder assembly. According to the invention, interlocking can be carried out after successful butt joint of the trolley frame and the ladder assembly, hook slipping is prevented, the hoisting safety is improved, and the risk of hook slipping in the hoisting process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of lifting equipment, and in particular to a trolley with mechanical interlocking protection. Background Art

[0002] In an aircraft maintenance workshop, workers need to use a ladder to repair damaged parts of the aircraft. The ladder can be powered by electricity to achieve extension and contraction functions and other electric functions, thereby achieving repairs at any position of the aircraft.

[0003] When the aircraft is large, the ladder structure is also huge. In terms of volume and weight, the staff cannot move the ladder freely. Therefore, it is very important to design a crane that can lift the ladder and realize the power supply docking of the ladder. Aircraft maintenance generally takes several days, and the ladder is in continuous use for a long time. For the lifting mechanism of the crane, it is necessary to lift the ladder for several days without stopping. The motor of the lifting mechanism may cause the hook to slip if it rotates for a long time. Once the hook slips, the ladder will fall. When the ladder falls, it will collide with the aircraft body, which will inevitably cause damage to the aircraft. The aircraft is a high-precision design and expensive. Therefore, if the hook slips, it will inevitably cause irreparable losses. Therefore, in response to the above problems, a trolley with mechanical interlocking protection is designed. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a trolley with mechanical interlocking protection, which interlocks after the trolley frame and the ladder frame are successfully docked to prevent the hook from slipping, thereby improving the safety of lifting and reducing the risk of the hook slipping during lifting.

[0005] The present invention provides a mechanical interlocking protection trolley for hoisting a ladder frame, wherein the top of the ladder frame is provided with a hoisting point, a power connection mechanism and ladder frame shafts distributed in a rectangular shape, comprising:

[0006] Trolley frame;

[0007] A running mechanism is arranged at the four corners of the trolley frame and is used to drive the trolley frame to move;

[0008] A lifting mechanism is arranged at the center of the trolley frame and is used to connect with the lifting point on the ladder frame to drive the ladder frame to rise or fall;

[0009] The interlocking mechanism comprises a docking assembly, a plug-in assembly and a plug-in drive assembly arranged on the trolley frame, the docking assembly is distributed in a rectangular shape and is used for the ladder frame shaft to be inserted, the plug-in assembly is symmetrically arranged in two groups and the two groups of the plug-in assemblies are respectively located between two adjacent groups of the docking assemblies, the plug-in drive assembly is connected to the two groups of the plug-in assemblies and is used to drive the two groups of the plug-in assemblies to extend or retract synchronously, and the plug-in assembly can extend and pass through the docking assembly and the ladder frame shaft to put the docking assembly and the ladder frame shaft in a locked state;

[0010] A power supply mechanism is arranged at the bottom of the trolley frame opposite to the power connection mechanism and is used for docking with the power connection mechanism to supply power to the ladder frame.

[0011] Furthermore, an induction plate is provided on the top of the ladder frame shaft;

[0012] The docking assembly includes a mounting sleeve arranged in a vertical direction, the mounting sleeve is fixedly arranged on the top of the trolley frame through a mounting plate, a laser limit sensor is arranged just above the mounting sleeve, the bottom of the mounting sleeve extends to the bottom of the trolley frame, and a limit hole for the plug-in assembly to pass through is horizontally opened on the mounting sleeve;

[0013] The bottom of the installation sleeve is provided with a bell mouth.

[0014] Furthermore, the plug-in assembly includes a connecting shaft, a coupling, a plug-in pin and a limiting cylinder, the connecting shaft is rotatably arranged on the top of the trolley frame through a bearing seat, and both ends of the connecting shaft are fixedly connected with the plug-in pin through the coupling;

[0015] The limiting cylinder is fixedly arranged on the mounting plate and passes through the limiting hole, and a avoidance hole for the ladder frame shaft to pass through is provided in the longitudinal direction of the limiting cylinder;

[0016] The plug-in pin comprises a pin body, a ball screw shaft and a ball screw nut. The pin body is hollow inside and the ball screw nut is fixedly arranged at its opening. One end of the ball screw shaft is fixedly connected to the coupling by a bolt, and the other end is sleeved in the pin body. The ball screw nut is threadedly sleeved on the outside of the ball screw shaft. One end of the pin body away from the coupling is inserted into the limiting cylinder and can be extended or contracted along the axial direction thereof.

[0017] The cross sections of the limiting cylinder and the pin body are both rectangular.

[0018] Furthermore, a protective cover is provided on the top of the trolley frame, and the plug-in drive assembly is arranged in the protective cover.

[0019] Furthermore, the plug-in drive assembly includes a double sprocket, a single sprocket, a transmission chain and a drive motor. The double sprocket is located between the two groups of connecting shafts. The single sprocket is fixedly sleeved on the two groups of connecting shafts. The single sprocket and the double sprocket are connected to each other through the transmission chain. The center of the double sprocket is fixedly connected to the drive motor that drives it to rotate.

[0020] Furthermore, a locking hole for the pin shaft to pass through is transversely opened on the ladder frame shaft, and a first limit switch is arranged on the mounting plate on one side of the mounting sleeve. When the locking hole on the ladder frame shaft is aligned with the limit hole on the mounting sleeve, the ladder frame shaft triggers the first limit switch to stop the lifting mechanism from rising.

[0021] Furthermore, a second limit switch is provided on the mounting plate on one side of the limit cylinder. When one end of the pin body passing through the limit cylinder passes through the locking hole on the ladder frame shaft, the pin body triggers the second limit switch to stop the pin shaft from extending.

[0022] Furthermore, a third limit switch is provided on the top of the trolley frame on one side of the ball screw shaft. When one end of the pin body passing through the limit cylinder is pulled out from the locking hole of the ladder frame shaft, the ball screw nut triggers the third limit switch to stop the pin shaft from contracting.

[0023] Furthermore, the power connection mechanism comprises a power connection docking plate arranged on the top of the ladder frame, and the top of the power connection docking plate is provided with a power connection male plug and at least two sets of cone shafts for positioning;

[0024] The power supply mechanism includes a mounting frame, an adjustment plate and a power supply docking plate, wherein the mounting frame is fixedly arranged at the bottom of the trolley frame, the adjustment plate is arranged below the mounting frame through an adjustment screw and an adjustment nut, the power supply docking plate is arranged below the adjustment plate through a guide shaft, and a power supply female plug matching the power supply male plug and at least two groups of docking shaft holes corresponding to the tapered shafts are arranged at the bottom of the power supply docking plate;

[0025] A spring is sleeved on the outside of the guide shaft, one end of the spring is fixedly connected to the adjustment plate, and the other end of the spring is fixedly connected to the power supply docking plate.

[0026] Furthermore, the mounting frame is fixedly provided with a fourth limit switch through a bracket, and the fourth limit switch is opposite to the frame body of the ladder frame. When the male power plug is docked with the female power plug, the frame body of the ladder frame triggers the fourth limit switch to stop the lifting mechanism from rising.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] (1) The present invention includes a trolley frame, a running mechanism, a lifting mechanism, an interlocking mechanism and a power supply mechanism. The lifting mechanism drives the ladder frame to rise, so that the ladder frame shaft on the ladder frame is inserted into the docking assembly on the trolley frame to achieve docking between the ladder frame and the trolley frame. After the ladder frame is docked with the trolley frame, the plug-in drive assembly drives the plug-in assembly to extend, so that the plug-in assembly passes through the ladder frame shaft and the docking assembly, so that the ladder frame shaft and the docking assembly are locked; the ladder frame is locked on the trolley frame through the interlocking mechanism to avoid the ladder frame falling due to the hook slipping of the lifting mechanism, and to prevent the ladder frame from accidentally falling, thereby improving the safety of the trolley lifting ladder frame and reducing the risk of the ladder frame accidentally falling. The mechanical structure realizes locking, and the structure is compact, simple to manufacture, easy to install, and safer.

[0029] (2) In the present invention, after the ladder frame is docked with the trolley frame, the power supply mechanism at the bottom of the trolley frame is docked with the power receiving mechanism on the ladder frame to realize power supply to the ladder frame. After power supply, the ladder frame can be extended or retracted or perform other electric actions; and the ladder frame and the trolley frame are locked by an interlocking mechanism. When the lifting mechanism slips, the ladder frame remains stable to prevent the ladder frame from accidentally falling and causing the power receiving mechanism to be separated from the power supply mechanism, so that the ladder frame can maintain a stable power supply state to prevent accidental power failure of the ladder frame.

[0030] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 It is a front view of the present invention;

[0034] Figure 3 It is a schematic diagram of the structure of the interlocking mechanism and the protective cover of the present invention;

[0035] Figure 4 It is a structural schematic diagram of the interlocking mechanism of the present invention;

[0036] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0037] Figure 6 It is a schematic diagram of the structure of the plug pin;

[0038] Figure 7for Figure 6 Middle AA section view;

[0039] Figure 8 It is a schematic diagram of the structure of the power supply mechanism;

[0040] Fig. 9 It is a structural schematic diagram of the top of the ladder frame;

[0041] Numbers in the figure: 1. Trolley frame; 2. Running mechanism; 3. Lifting mechanism; 4. Interlocking mechanism; 5. Power supply mechanism; 6. Protective cover; 7. Ladder frame; 8. Electric control box; 9. Four-color light;

[0042] 31. Hook set;

[0043] 41. Docking assembly; 42. Plug-in assembly; 43. Plug-in drive assembly;

[0044] 51. Mounting frame; 52. Adjustment plate; 53. Power supply docking plate; 54. Adjustment screw; 55. Guide shaft; 56. Power female plug; 57. Docking shaft hole; 58. Spring; 59. Fourth limit switch;

[0045] 71. Hoisting point; 72. Power connection mechanism; 73. Ladder frame shaft;

[0046] 411, mounting sleeve; 412, mounting plate; 413, laser limit sensor; 414, first limit switch;

[0047] 421, connecting shaft; 422, coupling; 423, plug pin; 424, limit cylinder; 425, bearing seat; 426, second limit switch; 427, third limit switch;

[0048] 431, double sprocket; 432, single sprocket; 433, transmission chain; 434, drive motor;

[0049] 721, electrical connection board; 722, electrical connection male plug; 723, tapered shaft;

[0050] 731, locking hole;

[0051] 4231, pin body; 4232, ball screw shaft; 4233, ball screw nut. DETAILED DESCRIPTION

[0052] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] Please refer to Figures 1 to 9 , an embodiment of the present invention provides a mechanical interlocking protection trolley, the trolley of the present application is a crane trolley, which is arranged on the main beam and is used to lift the ladder frame 7 used for aircraft maintenance; Fig. 9 As shown, the top of the ladder frame 7 is built into a rectangle by a beam body, and ladder frame shafts 73 are vertically arranged at the four corners of the ladder frame 7, and the four ladder frame shafts 73 are distributed in a rectangular shape. A hoisting point 71 and a power connection mechanism 72 are also arranged on the top of the ladder frame 7, wherein the hoisting point 71 is located at the center of the ladder frame 7, so that the ladder frame 7 can maintain balance during the hoisting process;

[0055] The mechanical interlocking protection trolley of the present application includes a trolley frame 1, on which a running mechanism 2, a lifting mechanism 3, an interlocking mechanism 4, a power supply mechanism 5 and an electric control box 8 are arranged. The electric control box 8 is provided with electrical components and a controller for controlling the trolley. The lifting mechanism 3, the interlocking mechanism 4 and the power supply mechanism 5 are all connected to the controller, wherein the running mechanism 2 is arranged at the four corners of the trolley frame 1, and the running mechanism 2 can adopt an existing conventional structure that can drive the trolley frame 1 to move, including wheels and a driving device for driving the wheels to rotate, the wheels are pressed on the main beam, and the wheels can be driven to rotate by the driving device, so that the trolley frame 1 moves along the main beam, thereby adjusting the position of the ladder frame 7 in the horizontal plane, and the position of the ladder frame 7 can be flexibly adjusted according to the maintenance position required by the aircraft;

[0056] The lifting mechanism 3 is arranged at the top center of the trolley frame 1. The lifting mechanism 3 adopts an existing conventional structure that can realize lifting and lowering, including a drum, a steel wire rope wound on the drum, a driving motor for driving the drum to rotate, and a hook group 31 wound on the steel wire rope. The hook group 31 is located below the trolley frame 1 and connected to the lifting point 71 on the ladder frame 7. The driving motor drives the drum to rotate, thereby driving the steel wire rope to be wound or unwound, and driving the ladder frame 7 to rise or fall during the process of winding or unwinding the steel wire rope;

[0057] The interlocking mechanism 4 includes a docking assembly 41, a plug-in assembly 42 and a plug-in drive assembly 43 arranged on the trolley frame 1. The docking assembly 41 is distributed in a rectangular shape and is used for the ladder frame shaft 73 to be inserted. Specifically, the docking assembly 41 is provided with four groups and corresponds to the four groups of ladder frame shafts 73 one by one, so that the ladder frame shaft 73 can be aligned and inserted; preferably, the plug-in assembly 42 is symmetrically provided with two groups and the two groups of plug-in assemblies 42 are respectively located between two adjacent groups of docking assemblies 41, and the plug-in drive assembly 43 is connected to the two groups of plug-in assemblies 42 to drive the two groups of plug-in assemblies 42 to extend or retract synchronously. The plug-in assembly 42 can extend and penetrate the docking assembly 41 and the ladder frame shaft 73, so that the docking assembly 41 and the ladder frame shaft 73 are in a locked state;

[0058] The power supply mechanism 5 is directly connected to the power connection mechanism 72 and is arranged at the bottom of the trolley frame 1 for connecting with the power connection mechanism 72 to supply power to the ladder frame 7.

[0059] When docking, the ladder frame 7 is driven to rise by the lifting mechanism 3, so that the ladder frame shafts 73 at the four corners of the ladder frame 7 are inserted into the docking assembly 41, and then the plug-in drive assembly 43 drives the plug-in assembly 42 to extend in the direction close to the docking assembly 41, so that the plug-in assembly 42 sequentially penetrates the docking assembly 41 and the ladder frame shafts 73, so that the four ladder frame shafts 73 are locked, and the ladder frame 7 is locked on the trolley frame 1, so as to avoid the ladder frame 7 from falling due to the slipping hook of the lifting mechanism 3, and prevent the ladder frame 7 from accidentally falling, thereby improving the safety of the trolley lifting ladder frame 7 and reducing the risk of accidental falling of the ladder frame 7; and in the process of docking the ladder frame shaft 73 with the docking assembly 41, the power supply mechanism 5 on the trolley frame 1 and the power connection mechanism 72 on the ladder frame 7 are also docked. When the ladder frame 7 is successfully docked with the trolley frame 1, the power supply mechanism 5 and the power connection mechanism 72 are successfully docked, so that the ladder frame 7 is powered. After the ladder frame 7 is powered, it can be extended or retracted or other electric actions are performed to assist in aircraft maintenance work;

[0060] In a preferred embodiment, if Figure 4 , Figure 5 and Fig. 9 As shown, a sensing plate is provided at the top of the ladder frame shaft 73; the docking assembly 41 includes a mounting sleeve 411 arranged in the vertical direction, the mounting sleeve 411 is fixedly arranged on the top of the trolley frame 1 through a mounting plate 412, a laser limit sensor 413 is arranged just above the mounting sleeve 411, the bottom of the mounting sleeve 411 extends to the bottom of the trolley frame 1, and a limit hole is horizontally opened on the mounting sleeve 411 for the plug-in assembly 42 to penetrate;

[0061] The bottom of the mounting sleeve 411 is provided with a bell mouth.

[0062] In this embodiment, a total of four mounting sleeves 411 are provided, and the four mounting sleeves 411 are provided one by one with the four ladder frame shafts 73, and the bottoms of the four mounting sleeves 411 are provided with bell mouths, and the ladder frame shafts 73 are guided to be inserted into the mounting sleeves 411 through the setting direction of the bell mouths;

[0063] During docking, the lifting mechanism 3 lifts the ladder frame 7 upward, and the laser limit sensor 413 emits light downward toward the axis of the mounting sleeve 411. The light penetrates the mounting sleeve 411 and shines on the sensing plate at the top of the ladder frame shaft 73. The sensing plate reflects the received light, and the laser limit sensor 413 receives the light reflected by the sensing plate. If the laser limit sensor 413 can receive the light reflected by the sensing plate, it means that the positions of the mounting sleeve 411 and the ladder frame shaft 73 are relatively aligned, and the lifting mechanism 3 continues to rise to perform the docking action. If the laser limit sensor 413 cannot receive the light reflected by the sensing plate, it means that the position of the ladder frame 7 is deviated, and the lifting mechanism 3 stops rising. The position of the ladder frame 7 needs to be adjusted before the docking action can be continued. The model of the laser limit sensor 413 is DT35, and the correctness of the docking of the ladder frame 7 is ensured by the setting of the laser limit sensor 413.

[0064] In a preferred embodiment, if Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the plug-in assembly 42 includes a connecting shaft 421, a coupling 422, a plug-in pin 423 and a limiting cylinder 424. The connecting shaft 421 is rotatably arranged on the top of the trolley frame 1 through a bearing seat 425. The bearing seat 425 is fixedly arranged on the top of the trolley frame 1 by bolts. The connecting shaft 421 is rotatably sleeved in the bearing seat 425, and both ends of the connecting shaft 421 are fixedly connected with the plug-in pin 423 through the coupling 422.

[0065] The limiting cylinder 424 is fixedly arranged on the mounting plate 412 and passes through the limiting hole, and a avoiding hole for the ladder frame shaft 73 to pass through is opened in the longitudinal direction on the limiting cylinder 424;

[0066] The plug-in pin 423 includes a pin body 4231, a ball screw shaft 4232 and a ball screw nut 4233. The pin body 4231 is hollow inside and a ball screw nut 4233 is fixedly arranged at its opening. One end of the ball screw shaft 4232 is fixedly connected to the coupling 422 by bolts, and the other end is sleeved in the pin body 4231. The ball screw nut 4233 is threadedly sleeved on the outside of the ball screw shaft 4232. The end of the pin body 4231 away from the coupling 422 is inserted into the limiting cylinder 424 and can be extended or contracted along the axial direction thereof. Specifically, the connecting shaft 421 and the ball screw shaft 4231 of the plug-in pin 423 are coaxially fixedly arranged through the coupling 422, so that the connecting shaft 421 and the ball screw shaft 4231 can rotate synchronously.

[0067] The cross sections of the limiting cylinder 424 and the pin body 4231 are both rectangular; specifically, the limiting cylinder 424 and the pin body 4231 are both rectangular parallelepiped structures, the pin body 4231 is inserted into the limiting cylinder 424, and the pin body 4231 is limited by the limiting cylinder 434 so that the pin body 4231 does not rotate with the rotation of the ball screw shaft 4232. When the ball screw shaft 4232 rotates, the pin body 4231 can extend or contract along the axial direction inside the limiting cylinder 434;

[0068] In this embodiment, when it is necessary to lock the ladder frame 7, the ball screw shaft 4232 rotates forward, and the end of the pin body 4231 passing through the limiting cylinder 424 extends toward the direction close to the mounting sleeve 411, and laterally penetrates the mounting sleeve 411 and the ladder frame shaft 73, thereby locking the ladder frame 7; when it is necessary to unlock the ladder frame 7, the ball screw shaft 7232 rotates reversely, and the end of the pin body 4231 passing through the limiting cylinder 424 contracts toward the direction away from the mounting sleeve 411, and the pin body 4231 is pulled out from the mounting sleeve 411 and the ladder frame shaft 73, thereby unlocking the ladder frame 7.

[0069] In a preferred embodiment, if Figure 1 and Figure 4 As shown, the plug-in drive assembly 43 includes a double sprocket 431, a single sprocket 432, a transmission chain 433 and a drive motor 434. The double sprocket 431 is located between the two sets of connecting shafts 421. The two sets of connecting shafts 421 are fixedly sleeved with a single sprocket 432. The single sprocket 432 and the double sprocket 431 are connected to each other through a transmission chain 433. The center of the double sprocket 431 is fixedly connected to a drive motor 434 for driving it to rotate.

[0070] In this embodiment, starting the driving motor 434 can drive the double sprocket 431 to rotate, and the single sprocket 432 can be rotated in the same direction through the transmission of the transmission chain 433. The rotation of the single sprocket 432 can drive the connecting shaft 421 fixedly connected to it to rotate synchronously, and then drive the coupling 422 and the ball screw shaft 4232 to rotate synchronously. The rotation of the ball screw shaft 4232 drives the pin body 4231 to extend or contract, thereby realizing the plug-in and pull-out action; the sprocket chain transmission structure is simple, easy to implement, safe and reliable.

[0071] In addition, tensioners are installed on both transmission chains 433 , and the tensioners enable the transmission chains 433 to maintain appropriate tension during the transmission process, thereby preventing the transmission chains 433 from loosening or falling off and reducing chain wear.

[0072] In a preferred embodiment, if Figure 1 and Figure 3As shown, a protective cover 6 is provided on the top of the trolley frame 1, and the plug-in drive assembly 43 is provided in the protective cover 6. Specifically, the double sprocket, the single sprocket and the transmission chain are protected by the protective cover 6 to prevent people from touching them.

[0073] In a preferred embodiment, if Figure 4 , Figure 5 and Fig. 9 As shown, a locking hole 731 is horizontally opened on the ladder frame shaft 73 for the pin shaft 4231 to pass through, and a first limit switch 414 is provided on the mounting plate 412 on one side of the mounting sleeve 411. When the locking hole 731 on the ladder frame shaft 73 is aligned with the limit hole on the mounting sleeve 411, the ladder frame shaft 73 triggers the first limit switch 414 to stop the lifting mechanism 3 from rising.

[0074] In this embodiment, the first limit switch 414 is a contact limit switch of model X145. A slot is provided longitudinally on the mounting sleeve 411, and the contact of the first limit switch 414 extends through the slot into the mounting sleeve 411. During the rising process of the frame 7, when the top of the ladder frame shaft 73 touches the contact of the first limit switch 414, the first limit switch 414 sends a control signal to the controller, and the controller stops the lifting mechanism 3 from rising to prevent the ladder frame 7 from rising excessively.

[0075] In a preferred embodiment, if Figure 4 , Figure 5 and Fig. 9 As shown, a second limit switch 426 is provided on one side of the limit cylinder 424 on the mounting plate 412. When one end of the pin body 4231 passing through the limit cylinder 424 passes through the locking hole 731 on the ladder frame shaft 73, the pin body 4231 triggers the second limit switch 426 to stop the pin shaft 4231 from extending.

[0076] In this embodiment, the second limit switch 426 is a contact limit switch of model X145. A slot is provided on one side of the limit cylinder 424. The contact of the second limit switch 426 extends through the slot into the limit cylinder 424. When the end of the pin body 4231 passes through the mounting sleeve 411 and the ladder frame shaft 73, the contact on the second limit switch 426 is triggered. The second limit switch 426 sends a control signal to the controller, and the controller stops the drive motor 434 in the plug-in drive mechanism 43 from rotating, thereby stopping the pin body 4231 from extending.

[0077] In a preferred embodiment, if Figure 4 As shown, a third limit switch 427 is provided on one side of the ball screw shaft 4232 at the top of the trolley frame 1. When one end of the pin body 4231 passing through the limit cylinder 424 is pulled out from the locking hole 731 of the ladder frame shaft 73, the ball screw nut 4233 triggers the third limit switch 427 to stop the pin shaft 4231 from contracting.

[0078] In this embodiment, the third limit switch 427 also uses a contact limit switch, model X145, and its working principle is the same as that of the second limit switch 426. When the end of the pin body 4231 is pulled out from the mounting sleeve 411, the ball screw nut 4233 touches the contact of the third limit switch 427, and the third limit switch 427 sends a control signal to the controller, and the controller stops the drive motor 434 in the plug-in drive mechanism 43 from rotating, thereby stopping the pin body 4231 from contracting.

[0079] In a preferred embodiment, if Figure 8 and Fig. 9 As shown, the power connection mechanism 72 includes a power connection docking plate 721 disposed on the top of the ladder frame 7, and a power connection male plug 722 and at least two sets of tapered shafts 723 for positioning are disposed on the top of the power connection docking plate 721;

[0080] The power supply mechanism 5 includes a mounting frame 51, an adjustment plate 52 and a power supply docking plate 53. The mounting frame 51 is fixedly arranged at the bottom of the trolley frame 1. The adjustment plate 52 is arranged below the mounting frame 51 through an adjustment screw 54 and an adjustment nut. The power supply docking plate 53 is arranged below the adjustment plate 52 through a guide shaft 55. The bottom of the power supply docking plate 53 is provided with a power supply female plug 56 matching the power supply male plug 722, and at least two groups of docking shaft holes 57 corresponding to the tapered shaft 723.

[0081] A spring 58 is sleeved on the outer portion of the guide shaft 55 . One end of the spring 58 is fixedly connected to the adjustment plate 52 , and the other end of the spring 58 is fixedly connected to the power supply docking plate 53 .

[0082] In this embodiment, the bottom of the adjustment plate 52 is rectangular and fixed with four groups of threaded rods. The power supply docking plate 53 is provided with four openings for the threaded rods to pass through. The power supply docking plate 53 is fixed below the adjustment plate 52 by adjusting nuts. By adjusting the position of the adjusting nuts on the threaded rods, the height of the power supply docking plate 53 can be adjusted to adapt to ladder shafts 73 of different lengths, thereby improving its application range.

[0083] When the ladder frame 7 is docked with the trolley frame 1, the ladder frame 7 moves upward, and when the power supply docking plate 53 and the power connection docking plate 721, the tapered shaft 723 is aligned with the docking shaft hole 57 and inserted into the docking shaft hole 57 for fixation, the power supply docking plate 53 is positioned, so that the power connection female plug 56 is aligned with the power connection male plug 722, and the power connection male plug 722 is inserted into the power connection female plug 56; and when the power connection docking plate 721 contacts the power supply docking plate 53, it provides an upward impact force to the power supply docking plate 53, and the spring 58 plays a buffering role to avoid the stop position of the ladder frame 7 exceeding the stroke and damaging the docking male plug 722 during docking.

[0084] In a preferred embodiment, if Figure 8 and Fig. 9 As shown, the mounting frame 51 is fixed with a fourth limit switch 59 through a bracket, and the fourth limit switch 59 is opposite to the frame body of the ladder frame 7. When the male power plug 722 is connected to the female power plug 56, the frame body of the ladder frame 1 triggers the fourth limit switch 59 to stop the lifting mechanism 3 from rising.

[0085] In this embodiment, the fourth limit switch 59 also uses a contact limit switch with model number X145. The contact of the fourth limit switch 59 is opposite to the frame of the ladder frame 1. When the male power plug 722 is connected to the female power plug 56, the frame at the top of the ladder frame 1 touches the contact of the fourth limit switch 59. The fourth limit switch 59 sends a control signal to the controller, and the controller stops the lifting mechanism 3 from rising to avoid the ladder frame 7 stopping position exceeding the stroke and damaging the docking male plug 722.

[0086] In some other preferred embodiments, Figure 2 As shown, a four-color lamp 9 is arranged on the trolley frame 1, and the four-color lamp 9 is connected to the controller. The four-color lamp 9 is composed of four LED lamps, which respectively correspond to the normal operation state of the trolley, the deceleration state before docking, the docking process state and the docking completion state. When the lifting mechanism 3 of the trolley does not lift the ladder frame, the LED lamp corresponding to the normal operation state of the trolley in the four-color lamp is on, and the other three lamps are off. When the trolley lifts the ladder frame 7 and rises slowly, the LED lamp corresponding to the deceleration state before docking is on, and the other three lamps are off. When the ladder frame 7 is docked with the trolley ladder frame 1, the laser limit sensor 413 receives the light reflected by the sensor plate and sends a signal to the controller, corresponding to the LED lamp of the docking process state, and the other three lamps are off. When the interlocking mechanism 4 locks the ladder frame 7, the second limit switch 426 sends a signal to the controller, corresponding to the LED lamp of the docking completion state is on, and the other three lamps are off. The operator can intuitively understand the docking state of the ladder frame 7 through the on and off of the four-color lamp 9 to warn the operator to pay attention to the docking condition of the ladder frame.

[0087] Working process:

[0088] During docking, the lifting mechanism 3 drives the ladder frame 7 to rise, so that the ladder frame shafts 73 at the four corners of the ladder frame 7 are inserted into the docking sleeve 411. When the top of the ladder frame shaft 73 triggers the first limit switch 414, the lifting mechanism 3 stops rising. At this time, the locking hole 731 on the ladder frame shaft 73 is aligned with the limiting hole on the mounting sleeve 411, and the driving motor 434 is started, driving the connecting shaft 421, the coupling 422 and the ball screw shaft 4232 to rotate forward synchronously. The forward rotation of the ball screw shaft 4232 drives the pin body 4231 to extend, and the pin body 4231 sequentially penetrates the limiting hole and the locking hole 731, so that the four ladder frame shafts 73 are locked, so that the ladder frame 7 is locked on the trolley frame 1, and the lifting mechanism 3 is prevented from slipping. The hook causes the ladder frame 7 to fall, thereby preventing the ladder frame 7 from accidentally falling, improving the safety of the trolley lifting the ladder frame 7, and reducing the risk of the ladder frame 7 accidentally falling; and in the process of docking the ladder frame 7 with the trolley frame 1, the power supply mechanism 5 on the trolley frame 1 is also docked with the power connection mechanism 72 on the ladder frame 7. When the ladder frame 7 is successfully docked with the trolley frame 1, the power supply mechanism 5 is successfully docked with the power connection mechanism 72 to realize power supply to the ladder frame 7. After power is supplied to the ladder frame 7, the ladder frame 7 can be telescoped or other electric actions can be performed to assist in aircraft maintenance work; when the lifting mechanism 3 slips, the ladder frame 7 remains stable, avoiding the ladder frame 7 from accidentally falling and causing the power connection mechanism 72 to be separated from the power supply mechanism 5, so that the ladder frame 7 can maintain a stable power supply state.

[0089] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0090] In the description of this specification, the description of the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0091] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A mechanically interlocked trolley for hoisting a ladder frame (7), wherein the top of the ladder frame (7) is provided with a hoisting point (71), a power connection mechanism (72) and ladder frame shafts (73) distributed in a rectangular shape, characterized in that: include: Trolley frame (1); A running mechanism (2) is arranged at four corners of the trolley frame (1) and is used to drive the trolley frame (1) to move; A lifting mechanism (3) is arranged at the center of the trolley frame (1) and is used to connect with a lifting point (71) on the ladder frame (7) to drive the ladder frame (7) to rise or fall; The interlocking mechanism (4) comprises a docking assembly (41), a plug-in assembly (42) and a plug-in drive assembly (43) arranged on the trolley frame (1); the docking assembly (41) is arranged in a rectangular shape and is used for the ladder frame shaft (73) to be inserted; the plug-in assembly (42) is symmetrically arranged in two groups and the two groups of plug-in assemblies (42) are respectively located between two adjacent groups of the docking assemblies (41); the plug-in drive assembly (43) is connected to the two groups of plug-in assemblies (42) and is used to drive the two groups of plug-in assemblies (42) to extend or retract synchronously; the plug-in assembly (42) can extend and penetrate the docking assembly (41) and the ladder frame shaft (73) so that the docking assembly (41) and the ladder frame shaft (73) are in a locked state; A power supply mechanism (5) is arranged at the bottom of the trolley frame (1) opposite to the power connection mechanism (72) and is used for docking with the power connection mechanism (72) to supply power to the ladder frame (7).

2. A mechanical interlocking protected trolley according to claim 1, characterized in that: An induction plate is arranged on the top of the ladder frame shaft (73); The docking assembly (41) comprises a mounting sleeve (411) arranged in a vertical direction, the mounting sleeve (411) being fixedly arranged on the top of the trolley frame (1) via a mounting plate (412), a laser limit sensor (413) being arranged directly above the mounting sleeve (411), the bottom of the mounting sleeve (411) extending to the bottom of the trolley frame (1), and a limit hole for the plug-in assembly (42) to pass through being opened transversely on the mounting sleeve (411); The bottom of the installation sleeve (411) is provided with a bell mouth.

3. A mechanical interlocking protected trolley according to claim 2, characterized in that: The plug-in assembly (42) comprises a connecting shaft (421), a coupling (422), a plug-in pin (423) and a limiting cylinder (424); the connecting shaft (421) is rotatably arranged on the top of the trolley frame (1) via a bearing seat (425), and both ends of the connecting shaft (421) are fixedly connected to the plug-in pin (423) via the coupling (422); The limiting cylinder (424) is fixedly arranged on the mounting plate (412) and passes through the limiting hole, and a avoidance hole for the ladder frame shaft (73) to pass through is provided in the longitudinal direction of the limiting cylinder (424); The plug-in pin (423) comprises a pin body (4231), a ball screw shaft (4232) and a ball screw nut (4233); the pin body (4231) is hollow inside and the ball screw nut (4233) is fixedly arranged at its opening; one end of the ball screw shaft (4232) is fixedly connected to the coupling (422) by bolts, and the other end is sleeved in the pin body (4231); the ball screw nut (4233) is threadedly sleeved on the outside of the ball screw shaft (4232); one end of the pin body (4231) away from the coupling (422) is inserted into the limiting cylinder (424) and can extend or shrink along the axial direction thereof; The cross sections of the limiting cylinder (424) and the pin body (4231) are both rectangular.

4. A mechanically interlocked protected trolley according to claim 3, characterized in that: A protective cover (6) is provided on the top of the trolley frame (1), and the plug-in drive assembly (43) is arranged inside the protective cover (6).

5. A mechanical interlocking protected trolley according to claim 4, characterized in that: The plug-in drive assembly (43) comprises a double sprocket (431), a single sprocket (432), a transmission chain (433) and a drive motor (434); the double sprocket (431) is located between the two groups of connecting shafts (421); the single sprocket (432) is fixedly sleeved on the two groups of connecting shafts (421); the single sprocket (432) and the double sprocket (431) are transmission-connected via the transmission chain (433); the center of the double sprocket (431) is fixedly connected to the drive motor (434) for driving the double sprocket (431) to rotate.

6. A mechanically interlocked protected trolley according to claim 5, characterized in that: A locking hole (731) for the pin shaft (4231) to pass through is provided in the horizontal direction on the ladder frame shaft (73), and a first limit switch (414) is provided on the mounting plate (412) on one side of the mounting sleeve (411). When the locking hole (731) on the ladder frame shaft (73) is aligned with the limit hole on the mounting sleeve (414), the ladder frame shaft (73) triggers the first limit switch (414) to stop the lifting mechanism (3) from rising.

7. A mechanically interlocked protected trolley according to claim 6, characterized in that: A second limit switch (426) is provided on the mounting plate (412) at one side of the limit cylinder (424); when one end of the pin body (4231) passing through the limit cylinder (424) passes through the locking hole (731) on the ladder frame shaft (73), the pin body (4231) triggers the second limit switch (426) to stop the pin shaft (4231) from extending.

8. A mechanically interlocked protected trolley according to claim 7, characterized in that: A third limit switch (427) is provided at the top of the trolley frame (1) on one side of the ball screw shaft (4232); when one end of the pin body (4231) passing through the limit cylinder (424) is pulled out of the locking hole (731) of the ladder frame shaft (73), the ball screw nut (4233) triggers the third limit switch (427) to stop the pin shaft (4231) from contracting.

9. A mechanically interlocked protected trolley according to claim 1, characterized in that: The power connection mechanism (72) comprises a power connection docking plate (721) arranged on the top of the ladder frame (7), and a power connection male plug (722) and at least two groups of cone shafts (723) for positioning are arranged on the top of the power connection docking plate (721); The power supply mechanism (5) comprises a mounting frame (51), an adjustment plate (52) and a power supply docking plate (53); the mounting frame (51) is fixedly arranged at the bottom of the trolley frame (1); the adjustment plate (52) is arranged below the mounting frame (51) through an adjustment screw (54) and an adjustment nut; the power supply docking plate (53) is arranged below the adjustment plate (52) through a guide shaft (55); and a power supply female plug (56) matching the power supply male plug (722) and at least two groups of docking shaft holes (57) corresponding to the tapered shaft (423) are arranged at the bottom of the power supply docking plate (53); The guide shaft (55) is sleeved with a spring (58) on its exterior, one end of the spring (58) being fixedly connected to the adjustment plate (52) and the other end of the spring (58) being fixedly connected to the power supply docking plate (53).

10. A mechanically interlocked protected trolley according to claim 9, characterized in that: The mounting frame (51) is fixedly provided with a fourth limit switch (59) through a bracket, and the fourth limit switch (59) is directly opposite to the frame body of the ladder frame (7). When the power male plug (722) is connected to the power female plug (56), the frame body of the ladder frame (7) triggers the fourth limit switch (59) to stop the lifting mechanism (3) from rising.

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