Boarding bridge lifting driving system

Abstract

The invention provides a boarding bridge lifting driving system. The boarding bridge lifting driving system comprises a lifting stand column, a supporting cross beam and a lifting driving device. The two lifting stand columns each comprise an inner guide pipe and an outer sleeve, and the outer sleeves are arranged on the inner guide pipes in a sleeving mode and can slide along the inner guide pipes. The supporting cross beam is arranged between the two lifting stand columns and connected to the outer sleeves on the two sides. The lifting driving device comprises a dual-output motor assembly, driving structures and a lifting connecting structure, the dual-output motor assembly is installed on the supporting cross beam, the two output ends of the dual-output motor assembly are both connected with the driving structures, and the ends, away from the dual-output motor assembly, of the driving structures are connected to the lifting connecting structure and fixed to the outer sleeve; the lifting connecting structure is positioned in the inner conduit and is in threaded connection with the inner conduit; the double-output motor assembly acts and drives the lifting connecting structure to ascend and descend along the inner guide pipe through the driving structure so as to drive the outer sleeve to ascend and descend along the inner guide pipe.

Description

Technical Field

[0001] The invention relates to the technical field of airport boarding bridges, and in particular to a boarding bridge lifting and driving system. Background Art

[0002] The boarding bridge is a movable and lifting passage used by the airport to connect the terminal hall to the aircraft. Each airport has multiple boarding bridges. One end of the boarding bridge is connected to a boarding gate in the terminal building, and the other end is buckled on the aircraft door. Passengers enter the aircraft from the corresponding boarding gate. The boarding bridge mainly includes lifting columns, rotating platforms, movable passages, receiving gates, and lifting systems. Among them, the lifting system is a driving mechanism that enables the boarding bridge to achieve vertical movement. The lifting column consists of an inner tube and an outer tube. The upper part of the outer tube is equipped with a driving motor, a reducer and a screw. The lower ends of the two inner tubes are fixed on a bottom beam, and a slider is inlaid between the inner tube and the outer tube.

[0003] When the boarding bridge was first created, it was a fully electromechanical bridge, using dual motors to drive two sets of lifting mechanisms. To this day, boarding bridges at home and abroad still use dual motors for lifting and driving. Even for motors of the same brand and model, there will be certain manufacturing errors during the production process, such as the weight distribution of the rotor and the winding accuracy of the stator. These subtle differences will cause a certain deviation in the motor speed. Although the lifting components on both sides are mirror-symmetrical structures, theoretically the loads of the lifting components on both sides are the same, but the lifting components are a set lifting structure composed of two square tubes and sliders. The straightness and distortion of the rolled steel pipes will still have certain errors even after the correction process adjustment. It is also difficult to adjust the gap between the slider and the square tube just right. These factors affect the load on both sides. There will be a certain difference, resulting in different speeds of the two motors. The two sides of the steel structure channel of the boarding bridge are rigidly fixedly connected to the outer sleeve of the lifting system, and the lower end of the inner tube of the lifting system is fixedly connected or welded to a bottom beam. When the speed difference is superimposed to a certain extent, it will cause shear stress to the rectangular channel, thereby causing deformation of the steel structure. Long-term accumulation will cause damage to the steel structure.

[0004] In order to avoid the synchronization error of the lifting system on both sides of the boarding bridge within the allowable range of standard control, the existing synchronous control methods of the boarding bridge are: 1) Limit switch control: There is a gap between the inner guide tube and the outer sleeve of the lifting mechanism of the boarding bridge. Under normal circumstances, the gap is uniform. When the column tilts, the gap between the inner and outer sleeves of the left and right columns changes. By using the tilt detection switch and the correction trigger block, the gap between the inner and outer sleeves of the lifting column is detected, and the synchronization of the lifting column is monitored in real time. When an abnormality occurs, an alarm is issued in time and manual adjustment is performed. The reliability is poor. 2) Monitor the height of the lifting columns on both sides: Use the proximity switch. When a metal object approaches its sensing area, the state of its output signal will change. The proximity switch is installed near the toothed disc. When the disc rotates, the teeth pass through the proximity switch in turn. Every time a tooth passes, the proximity switch will generate a pulse signal. By counting the pulse signal, the number of teeth that the toothed disc has rotated can be known. The lead of the screw is L. When the shaft rotates N circles, the distance the shaft moves is d=N×L. By comparing the distances of the two screws, the asynchronous condition can be detected. The proximity switch is a commonly used non-contact sensor with the advantages of simple structure, high reliability and long life. The combination of the toothed disc and the proximity switch can accurately detect the rotation of the shaft. The cost of the proximity switch and the toothed disc is relatively low, which can reduce the cost of the entire system; however, the process requires the induction toothed disc and the sensor detection element. In addition, the corresponding control program needs to be written and debugged, and the operation process is relatively complicated. 3) Encoder monitoring: Two lifting columns: The encoder outputs various types of signals, including incremental signals, absolute signals, etc. The incremental encoder requires pulse counting and direction judgment; the absolute encoder outputs a digital encoding signal, which needs to be decoded to obtain accurate position information. Signal processing is relatively complex and usually requires a more advanced controller or a dedicated decoding chip to process. The encoder has better protection measures and signal processing mechanisms inside, and has strong adaptability to the environment. Adopt a closed-loop feedback control system: A closed-loop feedback control system can be used to accurately control the rotation of the screw. By using an encoder, the speed of the motor can be monitored in real time and feedback control can be performed to ensure the consistency of the height of the two lifting columns, but the encoder price may be thousands of yuan or even tens of thousands of yuan, which is too expensive. 4) Force the lifting drive systems on both sides to be passively synchronized, connect the independent lifting mechanisms on both sides through a forced synchronization shaft, and force the lifting mechanisms on both sides to perform lifting movements at the same speed. Universal couplings can be installed on the tail output shafts of the motors on both sides, and then connected to a forced synchronization shaft, forcing the lifting drive mechanisms on both sides to be physically integrated to form a forced synchronous lifting system. It is also possible to connect an external commutator output shaft to the low-speed shaft of the reducer, and then assemble a gear coupling on the input shaft of the commutator, and then use a forced synchronization shaft to connect the gear couplings on both sides in series, so that regardless of the difference in the two drive motors and the loads on both sides, the speeds of the two screws are forced to move at the same speed.However, the hard method of mechanical forced synchronization requires adding synchronization components to the mechanical structure.

[0005] Therefore, it is necessary to provide a boarding bridge lifting drive system that can save costs and ensure the synchronization and reliability of the lifting system. Summary of the invention

[0006] The object of the present invention is to provide a boarding bridge lifting drive system which can save costs and ensure the synchronization and reliability of the lifting system.

[0007] To achieve the above object, the present invention provides a boarding bridge lifting drive system, comprising:

[0008] Two lifting columns, each lifting column comprises an inner guide tube and an outer sleeve, the outer sleeve is sleeved on the inner guide tube and can slide along the inner guide tube;

[0009] A supporting beam is arranged between the two lifting columns and connected to the outer sleeves on both sides;

[0010] The lifting drive device includes a dual-output motor assembly, a driving structure and a lifting connection structure. The dual-output motor assembly is installed on a supporting beam and both output ends of the dual-output motor assembly are connected to the driving structure. One end of the driving structure away from the dual-output motor assembly is connected to the lifting connection structure and fixed on an outer sleeve. The lifting connection structure is located in an inner guide tube and is threadedly connected to the inner guide tube. The dual-output motor assembly is actuated and drives the lifting connection structure to move up and down along the inner guide tube through the driving structure to drive the outer sleeve to move up and down along the inner guide tube.

[0011] After adopting the above technical scheme, the boarding bridge lifting drive system of the present invention drives the lifting columns on both sides to lift and lower by a dual-output motor assembly, which can save costs and ensure the synchronization and reliability of the lifting system. The boarding bridge lifting drive system includes two lifting columns and a supporting beam arranged between the two lifting columns. Each lifting column includes an inner guide tube and an outer sleeve, and the outer sleeve is sleeved on the inner guide tube and can slide along the inner guide tube. The lifting drive device is arranged on the supporting beam and can drive the outer sleeve to lift and slide along the inner guide tube. The lifting drive device includes a dual-output motor assembly, a driving structure and a lifting connection structure. The dual-output motor assembly is installed on the supporting beam and the two output ends of the dual-output motor assembly are connected to the driving structure so that the lifting columns at both ends can be lifted and lowered synchronously. One end of the driving structure away from the dual-output motor assembly is connected to the lifting connection structure and fixed on the outer sleeve, the lifting connection structure is located in the inner guide tube and is threadedly connected to the inner guide tube, and the lifting connection structure and the inner guide tube are threadedly movable to drive the outer sleeve to lift and lower relative to the inner guide tube. Specifically, the dual output motor assembly operates and drives the lifting connection structure to move along the inner conduit through the driving structure, so as to drive the outer tube to move along the inner conduit. The boarding bridge lifting drive system of the present invention has a reasonable overall structure, saves costs, and can ensure the synchronization of the lifting system, the connection is firm and reliable, and the lifting is reliable.

[0012] Preferably, the dual-output motor assembly includes a dual-output motor and an electromagnetic brake, the driving structure includes a universal joint shaft and a reducer, the electromagnetic brake is arranged in the dual-output motor, or the electromagnetic brake is arranged at the input end of the reducer; one end of the universal joint shaft is connected to the output end of the dual-output motor, and the other end is connected to the reducer.

[0013] Preferably, the reducer includes a base and a mounting flange, the base is mounted on the mounting flange and an elastic component is arranged between the base and the mounting flange, the reducer is mounted on the outer sleeve via the mounting flange, and an output shaft is arranged at the output end of the reducer, and the output shaft is hollow and forms a connecting cavity.

[0014] Preferably, the lifting connection structure includes a ball screw and a ball nut, the ball nut is installed in the inner guide tube, one end of the ball screw is installed in the connecting cavity and is perpendicular to the universal joint transmission shaft, and the ball screw is threadedly connected to the ball nut in the inner guide tube.

[0015] Preferably, a fixing portion is protrudingly provided at one end of the ball nut, and a plurality of inwardly recessed mounting grooves are provided along the circumference of the fixing portion. The mounting grooves are used to install elastic members. The elastic members are installed in the mounting grooves and protrude from the fixing portion, and the ball nut is elastically pressed against the inner wall of the inner conduit by the elastic members.

[0016] Preferably, a mounting portion cooperating with the fixing portion is provided in the inner conduit, the ball nut is located in the inner conduit and the fixing portion is placed at the mounting portion, and an elastic gasket is further provided between the fixing portion and the mounting portion.

[0017] Preferably, a connecting hole for fixing the ball nut is provided through the inner conduit, and the connecting hole is a waist-shaped hole; a first mounting hole is provided through the elastic member, and a second mounting hole is provided in the mounting groove, and the connecting bolt passes through the connecting hole, the first mounting hole and the second mounting hole in sequence to connect the inner conduit, the elastic member and the ball nut together; a spacer is also provided between the elastic member and the connecting bolt, and the spacer is located in the first mounting hole.

[0018] Preferably, the ball screw is key-connected to the output shaft, and a transmission connection assembly is provided between the ball screw and the outer sleeve, by means of which the ball screw can rotate relative to the outer sleeve; the transmission connection assembly includes a thrust spherical roller bearing, a bearing seat, a bearing sleeve, a locking nut and a first seal, the thrust spherical roller bearing and the bearing sleeve are sequentially sleeved on one end of the ball screw that cooperates with the output shaft and are locked by a locking nut, the bearing seat is sleeved on the thrust spherical roller bearing and the bearing sleeve and locked between the mounting flange and the outer sleeve, and the first seal is provided between the bearing sleeve, the thrust spherical roller bearing and the bearing seat.

[0019] Preferably, an oil injection assembly is also installed on the ball screw, and the oil injection assembly includes a pressure injection oil cup, an oil collecting pan and a second seal. The pressure injection oil cup is installed on the outside of the thrust spherical roller bearing and is connected to the thrust spherical roller bearing. The oil collecting pan is arranged below the thrust spherical roller bearing to receive grease. The second seal is installed between the pressure injection oil cup and the oil collecting pan.

[0020] Preferably, the outer sleeve is further provided with a plurality of groups of lower sliding components, which are installed on the outer sleeve and protrude into the sliding space between the outer sleeve and the inner conduit, and the plurality of groups of lower sliding components are distributed at the lower end of the outer sleeve along the circumference of the lifting column; the lower sliding component comprises a bottom plate, a lower slider and an adjusting pad, the lower slider is installed on the outer sleeve by means of the bottom plate, the adjusting pad is arranged between the bottom plate and the lower slider for adjusting the dynamic fit clearance between the lower slider and the inner conduit, so that the lower slider can slide along the inner conduit in the sliding space, and the adjusting pad is provided with a groove body for easy disassembly and assembly; the lifting column also comprises a plurality of groups of upper sliding components, the upper sliding components are also located in the sliding space between the outer sleeve and the inner conduit, and the plurality of groups of upper sliding components are distributed at the upper end of the lifting column along the circumference of the lifting column; the upper sliding component comprises a cover plate, an upper slider and a pad plate, the outer sleeve is provided with a through hole, the upper slider is installed on the inner conduit through the through hole, and the pad plate is installed on the through hole by means of the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0022] Figure 1 It is a structural diagram of a boarding bridge lifting drive system provided in one embodiment of the present invention.

[0023] Figure 2 yes Figure 1 A cross-sectional view of the internal structure.

[0024] Figure 3 yes Figure 2 A partial structural cross-sectional view of the lifting connection structure and the driving structure in the lifting column.

[0025] Figure 4 yes Figure 1 Structural diagram of the middle lifting column.

[0026] Figure 5 yes Figure 4 Exploded view of the structure of the middle outer casing.

[0027] Figure 6 yes Figure 4 The structure of the inner catheter is shown in an exploded view.

[0028] Figure 7 yes Figure 4 Exploded view of the structure of the lifting connection structure.

[0029] Figure 8 yes Figure 7 Exploded view of the structure of the lifting connection structure.

[0030] Fig. 9 yes Figure 7 Structural diagram of the ball nut.

[0031] Fig.10 yes Fig. 9 Partial cross-sectional view of the ball nut.

[0032] Fig.11 yes Figure 1 Exploded view of the dual-output motor assembly and drive structure.

[0033] Fig.12 It is a structural diagram of a dual-output motor assembly and a drive structure provided in one embodiment of the present invention.

[0034] Fig.13 It is a structural diagram of a dual-output motor assembly and a drive structure provided in another embodiment of the present invention.

[0035] Fig.14 It is a structural diagram of a dual-output motor assembly and a drive structure provided in yet another embodiment of the present invention.

[0036] Fig.15 yes Fig.14 Internal structure diagram connected to the lifting connection structure.

[0037] Fig.16 It is a structural diagram of the connection between the driving structure and the lifting connection structure provided by one embodiment of the present invention.

[0038] Fig.17 This is an example diagram of the application of the boarding bridge lifting and driving system of the present invention.

[0039] Description of reference numerals:

[0040] 100. Boarding bridge lifting drive system;

[0041] 10. Lifting column; 11. Outer sleeve; 110. Sliding space; 111. Fixed seat; 112. Through hole; 12. Inner guide tube; 121. Connecting hole; 122. Lower limit block; 123. Upper limit block; 13. Lower sliding assembly; 131. Bottom plate; 132. Adjusting pad; 1321. Groove; 133. Lower sliding block; 14. Upper sliding assembly; 141. Cover plate; 142. Pad; 143. Upper sliding block; 15. Limit switch;

[0042] 20. Support beam; 201. Install support;

[0043] 101. lifting drive device; 102. protective cover;

[0044] 30. Dual output motor assembly; 31. Dual output motor; 32. Electromagnetic brake;

[0045] 40. driving structure; 41. universal transmission shaft; 42. reducer; 421. base; 422. mounting flange; 423. output shaft; 424. extension shaft; 425. coupling; 426. elastic component; 4261. rubber sleeve; 4262. rubber gasket; 4263. flat gasket;

[0046] 50. lifting connection structure; 51. ball screw; 511. keyway; 512. connecting key; 52. ball nut; 520. fixing part; 5201. mounting groove; 5202. second mounting hole; 5203. oil filling hole; 521. connecting bolt; 522. elastic member; 5221. first mounting hole; 523. elastic gasket; 524. spacer; 525. support plate; 526. funnel type grease fitting; 53. transmission connection assembly; 531. thrust spherical roller bearing; 532. bearing sleeve; 533. locking nut; 534. bearing seat; 535. first sealing member; 54. oil filling assembly; 541. oil filling cup; 542. oil collecting tray; 543. second sealing member. DETAILED DESCRIPTION

[0047] In order to explain the technical content and structural features of the present invention in detail, further description will be given below in combination with the implementation modes and the accompanying drawings.

[0048] See also Figure 1 , Figure 2 and Fig.17 The present invention provides a boarding bridge lifting drive system 100, comprising two lifting columns 10 and a supporting beam 20 arranged between the two lifting columns 10, and also comprising a lifting drive device 101 for driving the lifting columns 10. The lifting column 10 comprises an inner guide tube 12 and an outer sleeve 11, and the outer sleeve 11 is sleeved on the inner guide tube 12 and can slide along the inner guide tube 12. A support seat for support is arranged at the bottom of the inner guide tube 12. The supporting beam 20 is arranged between the two lifting columns 10 and connected to the outer sleeve 11 on both sides through a mounting support 201. The lifting drive device 101 comprises a dual-output motor assembly 30, a driving structure 40 and a lifting connection structure 50. The dual-output motor assembly 30 is installed on the supporting beam 20 and both output ends of the dual-output motor assembly 30 are connected to the driving structure 40. The motor adopts a double-output shaft design to ensure the synchronous lifting and lowering activities of the lifting columns 10 on both sides. One end of the driving structure 40 away from the dual-output motor assembly 30 is connected to the lifting connection structure 50 and fixed to the outer sleeve 11. The lifting connection structure 50 is located in the inner guide tube 12 and is threadedly connected to the inner guide tube 12. The dual-output motor assembly 30 is actuated and drives the lifting connection structure 50 to move up and down along the inner guide tube 12 through the driving structure 40, so as to drive the outer sleeve 11 to move up and down along the inner guide tube 12. It can be understood that the dual-output motor assembly 30 drives the lifting connection structure 50 threadedly connected to the inner guide tube 12 through the driving structure 40, and the lifting connection structure 50 and the inner guide tube 12 move in a spiral manner to move up and down relative to the inner guide tube 12, and the driving structure 40 is fixed to the outer sleeve 11, so that the lifting connection structure 50 drives the driving structure 40 and the outer sleeve 11 to move up and down relative to the inner guide tube 12.

[0049] After adopting the above technical scheme, the boarding bridge lifting drive system 100 of the present invention drives the lifting columns 10 on both sides to lift and lower synchronously through a dual-output motor assembly 30, which can save costs and ensure the synchronization and reliability of the lifting system. The boarding bridge lifting drive system 100 includes two lifting columns 10 and a support beam 20 arranged between the two lifting columns 10. Each lifting column 10 includes an inner guide tube 12 and an outer sleeve 11, and the outer sleeve 11 is sleeved on the inner guide tube 12 and can slide along the inner guide tube 12. The lifting drive device 101 is arranged on the support beam 20 and can drive the outer sleeve 11 to lift and slide along the inner guide tube 12. The lifting drive device 101 includes a dual-output motor assembly 30, a drive structure 40 and a lifting connection structure 50. The dual-output motor assembly 30 is installed on the support beam 20 and the two output ends of the dual-output motor assembly 30 are connected to the drive structure 40, so that the lifting columns 10 at both ends can be lifted and lowered synchronously. One end of the driving structure 40 away from the dual-output motor assembly 30 is connected to the lifting connection structure 50 and fixed on the outer tube 11. The lifting connection structure 50 is located in the inner tube 12 and is threadedly connected to the inner tube 12. The lifting connection structure 50 and the inner tube 12 are threadedly movable to drive the outer tube 11 to move relative to the inner tube 12. Specifically, the dual-output motor assembly 30 moves and drives the lifting connection structure 50 to move along the inner tube 12 through the driving structure 40, so as to drive the outer tube 11 to move along the inner tube 12. The boarding bridge lifting drive system 100 of the present invention has a reasonable overall structure, saves costs, and can ensure the synchronization of the lifting system, and the connection is firm and reliable, and the lifting is reliable.

[0050] See also Figures 11 to 14 and Fig.17In some optional embodiments, the dual-output motor assembly 30 includes a dual-output motor 31 and an electromagnetic brake 32, and the drive structure 40 includes a universal transmission shaft 41 and a reducer 42. Among them, the electromagnetic brake 32 is arranged in the dual-output motor 31, or the electromagnetic brake 32 is arranged at the input end of the reducer 42. The motor is equipped with an electromagnetic brake 32, and the braking torque is more than twice the rated torque of the load to ensure rapid and reliable braking in an emergency. Since the boarding bridge has a heavy load and a large inertia, emergency braking is required in special occasions to ensure the safety of the aircraft. The braking torque of the brake needs to be larger. For this reason, more than twice the load torque is selected to ensure rapid and reliable braking in an emergency to avoid accidents. In addition, the brake motor can also adopt a dual brake motor with a structure of two customized electromagnetic brakes 32 to improve the safety of the lifting system. One end of the universal transmission shaft 41 is connected to the output end of the dual-output motor 31, and the other end is connected to the reducer 42. The reducer 42 can be a braking and deceleration composite transmission structure with a protective function. The universal transmission shaft 41 can better adapt to the change of the angle between the motor and the reducer 42 and transmit power. The two output ends of the dual-output motor 31 are connected to the universal transmission shaft 41, and the universal transmission shaft 41 is connected to the braking and deceleration composite transmission structure with a protective function. The reducer 42 has a dynamic and static sealing structure to avoid the intrusion of moisture and oil, and can be used directly in the open air. The dual-output motor 31 adopts a dustproof and waterproof motor with IP55 or above, and the entire lifting power source can be directly arranged on the top surface of the channel in the open air. In extremely cold areas, a protective cover 102 can also be set on the dual-output motor assembly 30 and the drive structure 40 to prevent icing.

[0051] See also Figures 1 to 4 , Figure 7 and Figures 11 to 15In some optional embodiments, the reducer 42 includes a base 421 and a mounting flange 422. The base 421 is mounted on the mounting flange 422 and an elastic component 426 may be provided between the base 421 and the mounting flange 422. The elastic component 426 includes a rubber gasket 4262 and a rubber sleeve 4261. The mounting surface of the base 421 of the reducer 42 is padded with a rubber gasket 4262, and a rubber sleeve 4261 is used for connecting the fixing bolt jacket and the flat gasket 4263. The number of rubber gaskets 4262 may be more than one, and the thickness and shape of the multiple rubber gaskets 4262 may be different. The elastic component 426 can effectively reduce shock and buffer. The rubber gasket 4262 has good elasticity and can absorb the vibration energy generated when the reducer 42 is running, reduce the impact of vibration on the equipment and surrounding structures, extend the service life of the equipment, and reduce noise. The elastic component 426 can also compensate for errors. It is difficult for the machined mounting surface to be completely flat. The elastic component 426 can also prevent loosening. The friction of the rubber gasket 4262 is relatively large, which can increase the friction between the mounting surfaces and help prevent the components from loosening due to vibration and other reasons. In other embodiments, the reducer 42 uses a reducer 42 with an extended shaft 424 (such as Fig.14 and 15 As shown in the figure, the output torque of the reducer 42 is connected to the ball screw 51 through a coupling 425 with a certain error compensation capability, thereby eliminating the transmission and influence of verticality, coaxiality, motor vibration, etc. caused by the manufacturing accuracy above the coupling 425. The fixing seat 111 on the outer sleeve 11 of the lifting system is directly welded to the pipe. Even if the radial and angular deviations of the installation reference of the reducer 42 caused by welding deformation and positioning errors are certain, they can be compensated by the coupling 425. The coupling 425 is selected from flexible couplings with certain compensation capabilities, low requirements for installation accuracy, and reliable operation, such as elastic couplings, chain couplings, etc. In this embodiment, the reducer 42 is installed on the outer sleeve 11 by means of a mounting flange 422, and an output shaft 423 is provided at the output end of the reducer 42. The output shaft 423 is hollow and forms a connecting cavity.

[0052] See also Figure 2 , Figure 3 and Figure 7 and Figure 8In some optional embodiments, the lifting connection structure 50 includes a ball screw 51 and a ball nut 52. The ball nut 52 is installed in the inner guide tube 12, and one end of the ball screw 51 is installed in the connection cavity. The ball screw 51 is approximately perpendicular to the universal transmission shaft 41. On the other hand, the ball screw 51 is threadedly connected to the ball nut 52 in the inner guide tube 12. The output shaft 423 of the reducer 42 is a hollow shaft, and the ball screw 51 is directly placed in the hollow connection cavity of the output shaft 423, so that the motive force of the dual output motor 31, after being amplified by the reducer 42, directly drives the ball screw 51 to rotate. The overall structure is compact and simple, with fewer parts and small manufacturing errors. Preferably, a fixing portion 520 is protrudingly provided at one end of the ball nut 52, and the fixing portion 520 is provided with a plurality of inwardly recessed mounting grooves 5201 along its circumference, and the mounting grooves 5201 are used to install an elastic member 522, and the elastic member 522 is installed in the mounting groove 5201 and protrudes out of the fixing portion 520, and the ball nut 52 is elastically pressed against the inner wall of the inner conduit 12 by the elastic member 522.

[0053] See also Figure 2 , Figure 3 and Figures 7 to 10 In some optional embodiments, a mounting portion cooperating with the fixing portion 520 is provided in the inner conduit 12, the ball nut 52 is located in the inner conduit 12 and the fixing portion 520 is placed at the mounting portion, and the mounting portion may be a support plate 525 for supporting the ball nut 52. An elastic gasket 523 is also provided between the fixing portion 520 and the support plate 525. Among them, a connecting hole 121 for fixing the ball nut 52 is provided through the inner conduit 12, and the connecting hole 121 is a waist-shaped hole. A first mounting hole 5221 is provided through the elastic member 522, and a second mounting hole 5202 is provided in the mounting groove 5201. The connecting bolt 521 passes through the connecting hole 121, the first mounting hole 5221 and the second mounting hole 5202 in sequence, so that the inner conduit 12, the elastic member 522 and the ball nut 52 are connected together. The connecting bolt 521 cooperates with the connecting hole 121 so that the ball nut 52 is fixed in the inner guide tube 12, and the connecting hole 121 is a waist-shaped hole, so that the ball nut 52 can float in the waist-shaped hole and can compensate for the activity error within a certain range. In addition, a funnel-type grease fitting 526 is installed on the ball nut 52, and an oil injection hole 5203 for installing the funnel-type grease fitting 526 is opened on the ball nut 52. The funnel-type grease fitting 526 is installed to ensure the smooth operation between the ball screw 51 and the ball nut 52.

[0054] On the other hand, a spacer 524 is also provided between the elastic member 522 and the connecting bolt 521, and the spacer 524 is located in the first mounting hole 5221. The spacer 524 can increase the connection strength, wear resistance, anti-dropping, and shock resistance. During operation, the angular deviation of the ball screw 51 is mainly absorbed and compensated by the deformation of the elastic member 522 of the ball nut 52. The installation of the ball nut 52 adopts a flexible connection. The ball nut 52 is located on the support plate 525. An elastic gasket 523 is lined between the fixed part 520 of the ball nut 52 and the support plate 525. The fixed part 520 is the nut flange. Four elastic members 522 are inlaid on each side of the fixed part 520 of the ball nut 52. With the help of the spacer 524, they are positioned on the fixed part 520 of the ball nut 52 with the connecting bolt 521. The ball nut 52 is wrapped by an elastic gasket 523 and four elastic parts 522. The elastic gasket 523 and the elastic parts 522 are made of elastic materials such as rubber or polyurethane, have good elasticity and shock absorption properties, and have certain radial and angular compensation capabilities. They can compensate for the slight displacement of the lifting mechanism caused by manufacturing errors, installation errors, etc., and can absorb the vibration and impact caused by the load of the boarding bridge, the operation of the motor, etc., improve the smoothness of the transmission, thereby improving the durability and reliability of the lifting drive device 101, so as to ensure the stability and normal operation of the lifting drive device 101 of the boarding bridge.

[0055] In some embodiments, the installation of the ball nut 52 adopts a rigid connection, and the flange of the ball nut 52 is directly fixed to the flange support plate of the inner guide tube 12 with screws. In this way, the errors generated during the manufacturing, installation, and operation process will generate additional stress, which is detrimental to the service life of the ball screw 51 and the nut, and is also prone to vibration during the transmission process. There are also methods of lining the ball nut 52 with a ball joint or adding a thrust joint bearing. Due to the contact spherical surface, it can swing around the center of the ball to a certain extent, which can adapt to the slight flexural deformation of the ball screw 51, but only compensate relative to the center of the ball. The installation structure of the ball nut 52 in the present invention has good elastic shock absorption performance and a certain radial and angular compensation ability, making the overall transmission more stable and reliable.

[0056] See also Figure 2 , Figure 3 and Figure 7 and Figure 8In some optional embodiments, the ball screw 51 is key-connected with the output shaft 423, and a keyway 511 is provided on the ball screw 51. The ball screw 51 is connected with the output shaft 423 through a connecting key 512, and the connecting key 512 can be a flat key or a spline. The ball screw 51 is placed on the fixing seat 111 at the top of the column outer sleeve 11 with the help of the bearing seat 534 on its shaft, and the mounting flange 422 is docked with the fixing seat 111 at the top of the outer sleeve 11, and the connecting bolts are screwed on, and the reducer 42 is aligned with the ball screw 51 and assembled on the mounting flange 422. The outer sleeve 11 and the fixing seat 111 thereon are preferably processed after welding to ensure the size and shape and position accuracy of the fixing seat 111. Specifically, a transmission connection assembly 53 is provided between the ball screw 51 and the outer sleeve 11, and the transmission connection assembly 53 is used to enable the ball screw 51 to rotate relative to the outer sleeve 11 when driving the outer sleeve 11 to rise and fall. The transmission connection assembly 53 includes a thrust spherical roller bearing 531, a bearing seat 534, a bearing sleeve 532, a locking nut 533 and a first sealing member 535. The thrust spherical roller bearing 531 and the bearing sleeve 532 are sequentially sleeved on one end of the ball screw 51 that matches the output shaft 423 and are locked by the locking nut 533. The bearing seat 534 is sleeved on the thrust spherical roller bearing 531 and the bearing sleeve 532 and locked between the mounting flange 422 and the outer sleeve 11. The first sealing member 535 is arranged between the bearing sleeve 532, the thrust spherical roller bearing 531 and the bearing seat 534. The thrust spherical roller bearing 531 has a very large axial load capacity and can withstand a number of radial loads while bearing an axial load.

[0057] See also Figure 2 , Figure 3 and Figures 7 to 10 In some optional embodiments, an oil injection assembly 54 is also installed on the ball screw 51, and the oil injection assembly 54 includes a pressure injection oil cup 541, an oil collecting pan 542, and a second sealing member 543. The pressure injection oil cup 541 is installed on the outside of the thrust spherical roller bearing 531 and is connected to the thrust spherical roller bearing 531, the oil collecting pan 542 is arranged below the thrust spherical roller bearing 531 to receive grease, and the second sealing member 543 is installed between the pressure injection oil cup 541 and the oil collecting pan 542.

[0058] See also Figures 2 to 6In some optional embodiments, the lifting column 10 is further provided with multiple groups of lower sliding components 13 and multiple groups of upper sliding components 14, so that the outer tube 11 can be lifted and slid relative to the inner tube 12 better. Specifically, multiple groups of lower sliding components 13 are provided on the outer tube 11, and the lower sliding components 13 are installed on the outer tube 11 and protrude into the sliding space 110 between the outer tube 11 and the inner tube 12. The multiple groups of lower sliding components 13 are distributed at the lower end of the outer tube 11 along the circumference of the lifting column 10. The lower sliding component 13 includes a bottom plate 131, a lower slider 133 and an adjustment pad 132. The lower slider 133 is installed on the outer tube 11 by means of the bottom plate 131, and the adjustment pad 132 is arranged between the bottom plate 131 and the lower slider 133 to adjust the dynamic fit clearance between the lower slider 133 and the inner tube 12, so that the lower slider 133 can slide along the inner tube 12 in the sliding space 110, and the adjustment pad 132 is provided with a groove 1321 for easy disassembly and assembly. It can be understood that the adjustment pad 132 is used to adjust the gap between the lower slider 133 and the inner conduit 12 during relative motion. On the other hand, the upper sliding assembly 14 is also located in the sliding space 110 between the outer sleeve 11 and the inner conduit 12, and multiple groups of upper sliding assemblies 14 are distributed at the upper end of the lifting column 10 along the circumference of the lifting column 10. The upper sliding assembly 14 includes a cover plate 141, an upper slider 143 and a pad 142. The outer sleeve 11 is provided with a through hole 112, and the upper slider 143 is installed on the inner conduit 12 through the through hole 112, and the pad 142 is installed on the through hole 112 by means of the cover plate 141. The upper slider 143 and the upper slider 143 are arranged between the outer sleeve 11 and the inner conduit 12, which can reduce the friction coefficient, so that the outer sleeve 11 can better move up and down in a straight line along the inner conduit 12. A lower limit block 123 and an upper limit block 122 are also provided on the inner guide tube 12 , and a limit switch 15 is provided on the outer sleeve 11 . The limit switch 15 senses the lower limit block 123 and the upper limit block 122 to determine the upper and lower sliding limits of the outer sleeve 11 .

[0059] like Figures 1 to 17As shown, the boarding bridge lifting drive system 100 of the present invention drives the lifting columns 10 on both sides to lift and lower synchronously through a dual-output motor assembly 30, which can save costs and ensure the synchronization and reliability of the lifting system. The boarding bridge lifting drive system 100 includes two lifting columns 10 and a support beam 20 arranged between the two lifting columns 10. Each lifting column 10 includes an inner guide tube 12 and an outer sleeve 11, and the outer sleeve 11 is sleeved on the inner guide tube 12 and can slide along the inner guide tube 12. The lifting drive device 101 is arranged on the support beam 20 and can drive the outer sleeve 11 to lift and slide along the inner guide tube 12. The lifting drive device 101 includes a dual-output motor assembly 30, a drive structure 40 and a lifting connection structure 50. The dual-output motor assembly 30 is installed on the support beam 20 and the two output ends of the dual-output motor assembly 30 are connected to the drive structure 40, so that the lifting columns 10 at both ends can be lifted and lowered synchronously. One end of the driving structure 40 away from the dual-output motor assembly 30 is connected to the lifting connection structure 50 and fixed on the outer sleeve 11. The driving structure 40 includes a reducer 42 with a hollow output shaft 423, and the lifting connection structure 50 includes a ball screw 51 and a ball nut 52. The ball nut 52 is installed in the inner guide tube 12, one end of the ball screw 51 is installed in the output shaft 423 of the reducer 42, and the ball screw 51 is located in the inner guide tube 12 and is threadedly connected with the ball nut 52. Among them, the ball nut 52 is flexibly installed in the inner guide tube 12, which can not only reduce shock, but also compensate for errors, and absorb vibration and impact, greatly improving the stability of the transmission, and can also reduce the installation accuracy requirements, and improve the durability and reliability of the system. The dual-output motor assembly 30 moves and drives the lifting connection structure 50 to move up and down along the inner guide tube 12 through the driving structure 40, thereby driving the outer sleeve 11 to move up and down along the inner guide tube 12. The boarding bridge lifting drive system 100 of the present invention can be applied to large lifting equipment such as boarding bridges. The overall structure is reasonably arranged, which saves costs and can ensure the synchronization of lifting on both sides of the lifting system. The connection is firm and reliable, and the lifting is reliable.

[0060] The above disclosure is only a preferred embodiment of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are all within the scope of the present invention.

Claims

1. A boarding bridge lifting drive system, characterized in that: include: Two lifting columns, each of which comprises an inner guide tube and an outer sleeve, wherein the outer sleeve is sleeved on the inner guide tube and can slide along the inner guide tube; A supporting beam, disposed between the two lifting columns and connected to the outer sleeves on both sides; A lifting drive device comprises a dual-output motor assembly, a driving structure and a lifting connection structure, wherein the dual-output motor assembly is mounted on the supporting crossbeam and both output ends of the dual-output motor assembly are connected to the driving structure, one end of the driving structure away from the dual-output motor assembly is connected to the lifting connection structure and fixed to the outer sleeve, and the lifting connection structure is located in the inner guide tube and is threadedly connected to the inner guide tube; the dual-output motor assembly is actuated and drives the lifting connection structure to move up and down along the inner guide tube through the driving structure to drive the outer sleeve to move up and down along the inner guide tube.

2. The boarding bridge lifting drive system according to claim 1, characterized in that: The dual-output motor assembly includes a dual-output motor and an electromagnetic brake, the driving structure includes a universal joint transmission shaft and a reducer, the electromagnetic brake is arranged in the dual-output motor, or the electromagnetic brake is arranged at the input end of the reducer; one end of the universal joint transmission shaft is connected to the output end of the dual-output motor, and the other end is connected to the reducer.

3. The boarding bridge lifting drive system according to claim 2, characterized in that: The reducer includes a base and a mounting flange, wherein the base is mounted on the mounting flange and an elastic component is arranged between the base and the mounting flange, and the reducer is mounted on the outer sleeve via the mounting flange. An output shaft is arranged at the output end of the reducer, and the output shaft is hollow and forms a connecting cavity.

4. The boarding bridge lifting drive system according to claim 3, characterized in that: The lifting connection structure includes a ball screw and a ball nut, the ball nut is installed in the inner guide tube, one end of the ball screw is installed in the connecting cavity and is perpendicular to the universal joint transmission shaft, and the ball screw is threadedly connected with the ball nut in the inner guide tube.

5. The boarding bridge lifting and driving system according to claim 4, characterized in that: A fixing portion is protrudingly provided at one end of the ball nut, and a plurality of inwardly recessed mounting grooves are provided along the circumference of the fixing portion. The mounting grooves are used to install elastic members, and the elastic members are installed in the mounting grooves and protrude from the fixing portion. The ball nut is elastically pressed against the inner wall of the inner conduit by the elastic members.

6. The boarding bridge lifting and driving system according to claim 5, characterized in that: A mounting portion cooperating with the fixing portion is arranged in the inner conduit, the ball nut is located in the inner conduit and the fixing portion is placed at the mounting portion, and an elastic gasket is also arranged between the fixing portion and the mounting portion.

7. The boarding bridge lifting and driving system according to claim 5, characterized in that: A connecting hole for fixing the ball nut is provided through the inner conduit, and the connecting hole is a waist-shaped hole; a first mounting hole is provided through the elastic member, and a second mounting hole is provided in the mounting groove, and a connecting bolt passes through the connecting hole, the first mounting hole, and the second mounting hole in sequence to connect the inner conduit, the elastic member, and the ball nut together; a spacer is also provided between the elastic member and the connecting bolt, and the spacer is located in the first mounting hole.

8. The boarding bridge lifting and driving system according to claim 4, characterized in that: The ball screw is key-connected to the output shaft, and a transmission connection assembly is provided between the ball screw and the outer sleeve, by means of which the ball screw can rotate relative to the outer sleeve; the transmission connection assembly comprises a thrust spherical roller bearing, a bearing seat, a bearing sleeve, a locking nut and a first seal, the thrust spherical roller bearing and the bearing sleeve are sequentially sleeved on one end of the ball screw that cooperates with the output shaft and are locked by the locking nut, the bearing seat is sleeved on the thrust spherical roller bearing and the bearing sleeve and locked between the mounting flange and the outer sleeve, and the first seal is provided between the bearing sleeve, the thrust spherical roller bearing and the bearing seat.

9. The boarding bridge lifting and driving system according to claim 8, characterized in that: The ball screw is also equipped with an oil injection assembly, which includes an oil pressure cup, an oil collecting pan and a second seal. The oil pressure cup is installed on the outside of the thrust spherical roller bearing and is connected to the thrust spherical roller bearing. The oil collecting pan is arranged below the thrust spherical roller bearing to receive grease. The second seal is installed between the oil pressure cup and the oil collecting pan.

10. The boarding bridge lifting and driving system according to claim 1, characterized in that: The outer tube is also provided with a plurality of lower sliding components, which are installed on the outer tube and protrude into the sliding space between the outer tube and the inner tube, and the plurality of lower sliding components are distributed at the lower end of the outer tube along the circumference of the lifting column; the lower sliding component includes a bottom plate, a lower slider and an adjustment pad, the lower slider is installed on the outer tube by means of the bottom plate, and the adjustment pad is arranged between the bottom plate and the lower slider to adjust the dynamic fit clearance between the lower slider and the inner tube so that the lower slider can The lifting column slides along the inner conduit in the sliding space, and a groove body is provided on the adjustment pad for easy disassembly and assembly; the lifting column also includes a plurality of groups of upper sliding components, and the upper sliding components are also located in the sliding space between the outer sleeve and the inner conduit, and the plurality of groups of upper sliding components are distributed at the upper end of the lifting column along the circumference of the lifting column; the upper sliding component includes a cover plate, an upper slider and a pad plate, a through hole is provided on the outer sleeve, the upper slider passes through the through hole and is installed on the inner conduit, and the pad plate is installed on the through hole by means of the cover plate.

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