An airport departure time value quantitative evaluation device

By designing an airport departure time value quantification assessment device, combined with a power system and MATLAB tools, accurate arrival time data collection and automatic calibration were achieved, solving the problem of inaccurate assessment in existing technologies, optimizing flight schedules, and improving airline profitability and passenger satisfaction.

CN120853432BActive Publication Date: 2025-11-21FEIYOU TECH CO LTD
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Patent Information

Application Number
CN202511343967.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-09-19
Publication Date
2025-11-21
Estimated Expiration
2045-09-19

AI Technical Summary

Technical Problem

Existing technologies lack a holistic and scientific assessment of the value of airport departure slots, and the data collection accuracy is insufficient. They also cannot be automatically triggered offline, resulting in inaccurate slot value assessments that affect flight efficiency and airline profitability.

Method used

Design an airport departure time value quantification assessment device, including a support frame, a power system, a stop detection mechanism and calibration components. The power system is automatically triggered when an aircraft arrives or departs, and the device is combined with MATLAB tools to simulate the flight schedule throughout the day, obtain accurate stop time data and update it regularly.

Benefits of technology

It enables the automatic collection of accurate arrival time data even offline, improving the automation of data collection, reducing energy consumption, and scientifically evaluating the value of departure times from a holistic perspective of all-day flight operations. This optimizes flight schedules, maximizes passenger satisfaction, and enhances airline profitability.

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Abstract

The application provides an airport departure time value quantitative evaluation device, and relates to the technical field of air traffic control management. The evaluation device comprises a support frame, a power system, a parking detection mechanism and a calibration assembly. The bottom end of the support frame is integrally formed with a base. The top end of the support frame is welded with a top plate. The bottom of the top plate is provided with a transmission box. One end of the transmission box is screwed on the side of the support frame. A gap is arranged between the transmission box and the top plate. The application more scientifically evaluates the value of the departure time from the global perspective of all-day flight execution, which has an important reference function for maximizing the satisfaction of passenger demand and the improvement of airline profitability. The evaluation device obtains more accurate and reliable parking time data. The historical data used in the evaluation method are regularly updated according to the collected accurate parking time. The evaluation device cooperates with the calibration assembly at the rear end to realize the automatic calibration function, thereby achieving the purpose of air traffic management.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air traffic control management, in particular to an airport departure time value quantitative evaluation device. BACKGROUND

[0002] The departure time is one of the most important resources of the airline, and the departure time has an important influence on the operation efficiency and operation income of the airline. In the busy airport and busy operation period, the supply of time resources is less than the demand, and the imbalance between supply and demand makes the flight time value rise. The strong demand side also shows that such flight time can bring more passenger volume or freight volume, more airline income, and more economic benefits.

[0003] The current method for evaluating the value of the time is basically to measure the income brought by the flight minus the operation cost of the flight, that is, to measure the profit brought by the flight at the time to quantify the value of the time. However, this method lacks consideration of the operation situation of the time, and only isolatedly evaluates the value of the time. On the other hand, the original data collection of the airport departure time mainly relies on the form of directly extracting from historical data, but the accuracy of the actual departure and parking time of the aircraft flight still needs to be improved, and in the long-term data collection process, it is impossible to realize automatic triggering collection in the offline state. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application aims to provide an airport departure time value quantitative evaluation device to solve the problems raised in the background art. The present application more scientifically evaluates the value of the departure time from the global perspective of the whole day flight execution, which has an important reference function for maximizing the passenger demand and improving the airline profit. The evaluation device obtains more accurate and reliable parking time data, and relies on the collected accurate parking time to regularly update the historical data used in the evaluation method. The evaluation device cooperates with the calibration component of the back end to realize the automatic calibration function, and achieves the purpose of air traffic management.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an airport departure time value quantification assessment device, comprising an assessment device body, the assessment device body including a support frame, a power system, a stop detection mechanism, and a calibration component. The bottom end of the support frame is integrally formed with a base, and the top end of the support frame is welded with a top plate. A transmission box is disposed at the bottom of the top plate, one end of the transmission box is screwed to the side of the support frame, and a gap is provided between the transmission box and the top plate. The power system is mounted at the bottom of the transmission box, and the output end of the power system is connected to the stop detection mechanism, which is installed between the transmission box and the top plate. The base is fixed to the airport ground by bolts. A calibration component is disposed at the rear end of the top of the support frame. A sound pickup mechanism is mounted on the surface of the top plate, and a rotating sleeve is disposed in the middle of the sound pickup mechanism, the rotating sleeve being connected to the top end of the power system. The support frame is generally inclined.

[0006] Furthermore, the power system includes a support platform, a motor, and a drive shaft. The support platform is mounted on one side of the support frame, and the motor is screwed onto the surface of the support platform. The output end of the motor is connected to the drive shaft. The port detection mechanism is mounted on the surface of the drive shaft, and a sound pickup mechanism is provided at the end of the drive shaft.

[0007] Furthermore, the pickup mechanism includes a rotating sleeve, a rotating arm, and a pickup. The pickup is mounted on the surface of the top plate, and the rotating sleeve is embedded in the middle of the top plate through a bearing and fixed to the end of the drive shaft.

[0008] Furthermore, the rotating sleeve has an integrally formed rotating arm on its side, and a sponge pad is attached to the bottom end of the rotating arm. There are two sponge pads and two microphones, and the sponge pads cover the surface of the microphones after the rotating sleeve rotates.

[0009] Furthermore, the port detection mechanism includes an inner sleeve, an outer sleeve, and a ranging module. The drive shaft passes through the inside of the outer sleeve and the inner sleeve. A gap is provided between the inner sleeve and the outer sleeve. A support rod is welded to the side of the outer sleeve.

[0010] Furthermore, a ranging module is screwed to the end of the support rod, the drive shaft and the inner sleeve are fixedly connected, a groove is formed on the surface of the inner sleeve, a spring rod is inserted into the groove, and a ball bearing is provided at the end of the spring rod.

[0011] Furthermore, a slot is provided on the inner wall of the inner sleeve, and the ball is used to be embedded in the slot. The ball and the spring rod are evenly distributed on the side of the drive shaft. A partition is welded to the bottom of the top plate, and a calibration hole is provided on the side of the partition. The ranging module is rotated and rests against the two sides of the partition.

[0012] Further, the calibration assembly comprises a telescopic sleeve, a telescopic plate, a transmission frame and a reflection channel, the telescopic plate is inserted into the inside of the telescopic sleeve, the reflection channel is integrally formed at the tail end of the telescopic plate, the transmission frame is welded on the side edge of the telescopic plate, the lower hanging plate is integrally formed on the side edge of the telescopic sleeve, the guide channel is arranged at the tail end of the lower hanging plate, the gear rack is arranged at one end of the transmission frame, the gear rack passes through the inside of the guide channel, the gear is further connected to the surface of the driving shaft in the form of a key, and the gear is used for engaging with the gear rack.

[0013] An evaluation method using the above quantitative evaluation device, comprising the following steps:

[0014] S1, using historical data statistical method, analyzing the travel demand of each hour period, building evaluation device, obtaining more accurate departure time data, periodically updating the airport departure time point in the collected historical data through the departure time data obtained by the evaluation device;

[0015] S2, standardizing the demand, K-S test, verifying that the demand data of each hour period conforms to the standard normal distribution after testing the distribution of the standardized demand;

[0016] S3, randomly sampling on the standard normal distribution demand curve of each hour as the demand of the period, generating a random demand curve for the whole day;

[0017] S4, using matlab tool to find the sequence of airport departure time points that meet the time interval constraint;

[0018] S5, based on the demand curve, using matlab tool to perform N times of departure time arrangement simulation, using enumeration method to find the optimal sequence that meets the demand most and the travel demand that can be met by the optimal sequence;

[0019] S6, in multiple simulation runs, the optimal sequence and the demand met under the two situations of available and unavailable for the evaluated time are found by enumeration method each time, and the difference between the two is regarded as the value of the departure hour time.

[0020] Further, in step S4, the first simulation process is started by using the matlab tool, the demand of each hour period is randomly taken as the demand of the period to obtain the demand curve for the whole day, and the optimal all-day flight time arrangement sequence is found on the demand curve by using the enumeration method, and the passenger demand that can be met under the optimal arrangement is calculated.

[0021] The beneficial effects of the present application are:

[0022] The airport departure time value quantitative evaluation device installs and supports the top port detection mechanism by building a support frame, so that it can detect the flight port area within a certain range, and record the aircraft port time and departure time in the area, finally obtain more accurate and reliable port time data, and realize automatic calibration function with the calibration component of the back end, and update the historical data used in the evaluation method regularly through the port time data collected by the quantitative evaluation device.

[0023] The airport departure time value quantitative evaluation device can realize automatic triggering collection in offline state in a long time data collection process, and automatically trigger the power system to run when there is an aircraft in the bottom nearest area, so as to automatically select start and stop state in offline state, reduce energy consumption and improve the utilization rate of the equipment.

[0024] The airport departure time value quantitative evaluation method considers the airport departure time to be evaluated in the flight chain of the day as a whole, can more scientifically evaluate the value of the departure time from the global perspective of the whole day flight execution, and has important reference role for optimizing the whole day flight time arrangement, maximizing the passenger demand and improving the airline profit. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The flowchart of the airport departure time value quantitative evaluation method of the application;

[0026] Figure 2 The external structure diagram of the airport departure time value quantitative evaluation device of the application;

[0027] Figure 3 The structure diagram of the top of the evaluation device of the application;

[0028] Figure 4 The structure diagram of the port detection mechanism part of the application;

[0029] Figure 5 The internal sectional view of the port detection mechanism of the application;

[0030] Figure 6 The Figure 5 The enlarged view of area A;

[0031] Figure 7 The structure diagram of the calibration component part of the application;

[0032] Figure 8 The structure diagram of the pickup mechanism part of the application;

[0033] In the figure: 1, base; 2, support frame; 3, top plate; 4, power system; 5, transmission box; 6, port detection mechanism; 7, calibration assembly; 8, support table; 9, motor; 10, drive shaft; 11, pickup mechanism; 12, telescopic sleeve; 13, outer sleeve; 14, gear; 15, support rod; 16, distance measuring module; 17, inner sleeve; 18, groove; 19, spring rod; 20, clamping groove; 21, ball; 22, lower hanging plate; 23, guide channel; 24, transmission frame; 25, telescopic plate; 26, reflection channel; 27, rack; 28, rotating sleeve; 29, rotating arm; 30, sponge pad; 31, pickup; 32, partition; 33, calibration hole. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in conjunction with specific embodiments.

[0035] Please refer to Figures 1 to 8 The present application provides the following technical solutions: an airport departure time value quantitative evaluation device, comprising an evaluation device body, the evaluation device body comprising a support frame 2, a power system 4, a port detection mechanism 6 and a calibration assembly 7, the bottom end of the support frame 2 is integrally formed with a base 1, the top end of the support frame 2 is welded with a top plate 3, the bottom of the top plate 3 is provided with a transmission box 5, one end of the transmission box 5 is screwed on the side of the support frame 2, and a gap is provided between the transmission box 5 and the top plate 3, the bottom of the transmission box 5 is built with a power system 4, the output end of the power system 4 is connected with a port detection mechanism 6, the port detection mechanism 6 is installed between the transmission box 5 and the top plate 3, the base 1 is fixed on the ground of the airport by bolts, the top rear end of the support frame 2 is provided with a calibration assembly 7, the surface of the top plate 3 is installed with a pickup mechanism 11, the middle of the pickup mechanism 11 is provided with a rotating sleeve 28, and the rotating sleeve 28 is connected to the top end of the power system 4. The support frame 2 is in an inclined state as a whole. The quantitative evaluation device is used for collecting the accurate time points of arrival and departure of flights in the airport, calculating the port time, and can be automatically realized in an offline environment.

[0036] When the application is used, the base 1 is fixed in the range of the airport to be measured, the top assembly is supported and lifted by the inclined support frame 2, and the top port detection mechanism 6 can be ensured to be able to probe several aircraft parking areas obliquely downward. After installation, whether there is a large change in noise in the current environment is judged by the top pickup mechanism 11. When the aircraft arrives and departs, the pickup mechanism 11 judges that the scene of arrival and departure will be generated, so as to start the power system 4 at the bottom, control the operation of the top port detection mechanism 6 through the power system 4, measure the distance of the obliquely downward area by the port detection mechanism 6, judge whether the aircraft arrives and departs in the corresponding area parking position, and record the specific arrival and departure time, so as to collect the required actual data of the port, and in the long-term use process, the calibration assembly 7 at the back end automatically realizes the verification and calibration function of the distance measuring module 16 in the port detection mechanism 6.

[0037] In the embodiment, the power system 4 includes a support table 8, a motor 9 and a drive shaft 10. The support table 8 is installed on one side of the support frame 2. The surface of the support table 8 is screwed with the motor 9. The output end of the motor 9 is connected with the drive shaft 10. The port detection mechanism 6 is installed on the surface of the drive shaft 10. The end of the drive shaft 10 is provided with a pickup mechanism 11. The pickup mechanism 11 includes a rotating sleeve 28, a rotating arm 29 and a pickup 31. The pickup 31 is installed on the surface of the top plate 3. The rotating sleeve 28 is embedded in the middle position of the top plate 3 through a bearing, and the rotating sleeve 28 is fixed at the end of the drive shaft 10. The side of the rotating sleeve 28 is integrally formed with the rotating arm 29. The end of the rotating arm 29 is attached with a sponge pad 30. The number of the sponge pad 30 and the pickup 31 is two. The sponge pad 30 covers the surface of the pickup 31 after rotating movement through the rotating sleeve 28.

[0038] Specifically, after starting the motor 9, the port detection mechanism 6 on the output end is driven to operate by the motor 9. At the same time, the rotating sleeve 28 on the top plate 3 can also drive the rotating arm 29 on the side to rotate. The motor 9 is started regularly, the rotating arm 29 at the top is driven to reciprocate periodically by the drive shaft 10, so that the surface of the pickup 31 can be scraped and cleaned by the sponge pad 30 on the side. When not used for a long time, the pickup 31 part can be directly covered and shielded, which plays a dustproof role.

[0039] The port detection mechanism 6 comprises an inner sleeve 17, an outer sleeve 13 and a distance measuring module 16. The driving shaft 10 passes through the inside of the outer sleeve 13 and the inner sleeve 17. A gap is arranged between the inner sleeve 17 and the outer sleeve 13. The side of the outer sleeve 13 is welded with a support rod 15. The end of the support rod 15 is screwed with the distance measuring module 16. The driving shaft 10 and the inner sleeve 17 are partially fixedly connected. The surface of the inner sleeve 17 is provided with a groove 18. The inside of the groove 18 is inserted with a spring rod 19. The end of the spring rod 19 is provided with a ball 21. In the long-term data collection process, the automatic triggering collection purpose in the offline state can be realized. Through the pickup mechanism 11 at the top, the power system 4 can be automatically triggered to run when the aircraft docks or departs in the nearest area at the bottom. Thus, the start-stop state in the offline state can be automatically selected. The energy consumption is reduced, and the utilization rate of the equipment is improved.

[0040] Specifically, after the starting motor 9 is started, the inner sleeve 17 is driven to rotate by the driving shaft 10. The inner sleeve 17 drives each ball 21 to rotate through the spring rod 19 at the side. The ball 21 is clamped in the inside of the clamping groove 20. Thus, the entire outer sleeve 13 can be directly driven to rotate. Thus, the distance measuring module 16 at the end is indirectly controlled to rotate. The distance measuring module 16 scans and irradiates the port area in the coverage range at the bottom. When the aircraft docks or departs, the distance measuring module 16 generates a change in the measured distance after irradiating the aircraft docking area. Each time the change occurs, the current time point is recorded and marked as docking or departing.

[0041] The inner wall of the inner sleeve 17 is provided with a clamping groove 20, the ball 21 is used for embedding in the inner part of the clamping groove 20, the ball 21 and the spring rod 19 are uniformly distributed on the side of the driving shaft 10, the bottom of the top plate 3 is welded with a partition plate 32, the side of the partition plate 32 is provided with a calibration hole 33, and the distance measuring module 16 is abutted on both sides of the partition plate 32 by rotating. The calibration assembly 7 comprises a telescopic sleeve 12, a telescopic plate 25, a transmission frame 24 and a reflection channel 26, the inner side of the telescopic sleeve 12 is provided with the telescopic plate 25, the end of the telescopic plate 25 is integrally formed with the reflection channel 26, the side of the telescopic plate 25 is welded with the transmission frame 24, the side of the telescopic sleeve 12 is integrally formed with a hanging plate 22, the end of the hanging plate 22 is provided with a guide channel 23, one end of the transmission frame 24 is provided with a rack 27, the rack 27 passes through the inside of the guide channel 23, and the surface of the driving shaft 10 is further provided with a gear 14 in a key connection mode, and the gear 14 is used for being engaged with the rack 27. The support frame 2 is used for installing and supporting the top port detection mechanism 6, so that the port detection mechanism 6 can detect the flight port area within a certain range, and the flight port time and the departure time in the area can be recorded, so that more accurate and reliable port time data can be obtained, and the automatic calibration function can be realized in cooperation with the calibration assembly 7 at the rear end.

[0042] Specifically, the motor 9 is started regularly to control the driving shaft 10 to rotate continuously until the support rod 15 drives the distance measuring module 16 to rotate to one side of the partition plate 32, at this time, the distance measuring module 16 is blocked by the partition plate 32, in this state, the driving shaft 10 drives the inner sleeve 17 to rotate, and the outer sleeve 13 is also blocked, so that the ball 21 drives the spring rod 19 to be dislocated with the outer sleeve 13, the spring rod 19 is compressed, therefore, the distance measuring module 16 is always stopped at one side of the partition plate 32, and the driving shaft 10 still rotates, at this time, the gear 14 is driven to rotate, the gear 14 controls the rack 27 to drive the transmission frame 24 to move translationally, the transmission frame 24 continuously controls the telescopic plate 25 at the end to move, so as to change the position of the reflection channel 26, at this time, the reflection channel 26 at the end moving continuously and uniformly can be measured by the distance measuring module 16, and whether the distance measuring module 16 is normal can be judged finally by comparing the change of the measured data with the speed of the transmission frame 24 driving the reflection channel 26 to extend.

[0043] The embodiment also provides an evaluation method using the quantitative evaluation device, comprising the following steps:

[0044] S1, using a historical data statistical method, analyzing the travel demand of each hour period, building an evaluation device, obtaining more accurate departure time data, and periodically updating the airport departure time point in the collected historical data by using the departure time data obtained by the evaluation device;

[0045] S2, standardize the demand, perform K-S test, and verify that the demand data of each hour period conforms to the standard normal distribution after testing the distribution of the standardized demand;

[0046] S3, randomly sample on the standard normal distribution demand curve of each hour as the demand of the period to generate a random demand curve for the whole day;

[0047] S4, find the sequence of airport departure time points that meet the time interval constraints by using the matlab tool, start the first simulation process by using the matlab tool, randomly take the value of the demand curve of each hour period as the demand of the period to obtain the demand curve for the whole day, and find the optimal sequence of the whole day flight time arrangement by using the enumeration method, and calculate the passenger demand that can be met under the optimal arrangement;

[0048] S5, based on the demand curve, use the matlab tool to perform N times of departure time arrangement simulation, and find the optimal sequence that meets the demand most and the travel demand that can be met by using the enumeration method;

[0049] In the multiple simulation runs, the optimal sequence and the demand met under the two situations of available and unavailable to be evaluated time are found by using the enumeration method each time, and the difference between the two can be regarded as the value of the departure hour time.

[0050] The above quantitative evaluation method considers the airport departure time to be evaluated in the flight chain of the day as a whole, can more scientifically evaluate the value of the departure time from the global perspective of the whole day flight execution, and has an important reference role for optimizing the whole day flight time arrangement, maximizing the satisfaction of passenger demand and improving the airline profit.

[0051] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application.

[0052] In addition, it should be understood that although the present application is described in the form of embodiments, each embodiment does not contain only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. An airport departure time slot value quantification assessment device, comprising an assessment device body, characterized in that: The evaluation device body includes a support frame (2), a power system (4), a port detection mechanism (6), and a calibration component (7). The bottom end of the support frame (2) is integrally formed with a base (1), and the top end of the support frame (2) is welded with a top plate (3). A transmission box (5) is provided at the bottom of the top plate (3). One end of the transmission box (5) is screwed to the side of the support frame (2), and a gap is provided between the transmission box (5) and the top plate (3). The power system (4) is built at the bottom of the transmission box (5). The output end of 4) is connected to a port detection mechanism (6), which is installed between the transmission box (5) and the top plate (3). The base (1) is fixed to the ground of the airport by bolts. A calibration component (7) is provided at the top rear end of the support frame (2). A pickup mechanism (11) is installed on the surface of the top plate (3). A rotating sleeve (28) is provided in the middle of the pickup mechanism (11). The rotating sleeve (28) is connected to the top of the power system (4). The support frame (2) is tilted as a whole.

2. The airport departure time value quantification assessment device according to claim 1, characterized in that: The power system (4) includes a support platform (8), a motor (9) and a drive shaft (10). The support platform (8) is installed on one side of the support frame (2). The motor (9) is screwed onto the surface of the support platform (8). The output end of the motor (9) is connected to the drive shaft (10). The port detection mechanism (6) is installed on the surface of the drive shaft (10). The end of the drive shaft (10) is provided with a pickup mechanism (11).

3. The airport departure time value quantification assessment device according to claim 2, characterized in that: The pickup mechanism (11) includes a rotating sleeve (28), a rotating arm (29) and a pickup (31). The pickup (31) is mounted on the surface of the top plate (3). The rotating sleeve (28) is embedded in the middle position of the top plate (3) through a bearing, and the rotating sleeve (28) is fixed to the end of the drive shaft (10).

4. The airport departure time value quantification assessment device according to claim 3, characterized in that: The rotating sleeve (28) has an integrally formed rotating arm (29) on its side. A sponge pad (30) is attached to the bottom end of the rotating arm (29). There are two sponge pads (30) and two microphones (31). The sponge pads (30) cover the surface of the microphones (31) after the rotating sleeve (28) rotates.

5. The airport departure time value quantification assessment device according to claim 2, characterized in that: The port detection mechanism (6) includes an inner sleeve (17), an outer sleeve (13) and a ranging module (16). The drive shaft (10) passes through the interior of the outer sleeve (13) and the inner sleeve (17). A gap is provided between the inner sleeve (17) and the outer sleeve (13). A support rod (15) is welded to the side of the outer sleeve (13).

6. The airport departure time value quantification assessment device according to claim 5, characterized in that: The end of the support rod (15) is screwed with a ranging module (16). The drive shaft (10) and the inner sleeve (17) are partially fixedly connected. The surface of the inner sleeve (17) is provided with a groove (18). A spring rod (19) is inserted into the groove (18). A ball bearing (21) is provided at the end of the spring rod (19).

7. The airport departure time value quantification assessment device according to claim 6, characterized in that: The inner sleeve (17) has a slot (20) on its inner wall. The ball (21) is used to be embedded in the slot (20). The ball (21) and the spring rod (19) are evenly distributed on the side of the drive shaft (10). The bottom of the top plate (3) is welded with a partition (32). The side of the partition (32) has a calibration hole (33). The ranging module (16) is rotated and rests against the two sides of the partition (32).

8. The airport departure time value quantification assessment device according to claim 6, characterized in that: The calibration assembly (7) includes a telescopic sleeve (12), a telescopic plate (25), a transmission frame (24), and a reflection channel (26). The telescopic plate (25) is inserted into the inner side of the telescopic sleeve (12). The reflection channel (26) is integrally formed at the end of the telescopic plate (25). The transmission frame (24) is welded to the side of the telescopic plate (25). The lower hanging plate (22) is integrally formed on the side of the telescopic sleeve (12). The guide channel (23) is opened at the end of the lower hanging plate (22). A rack (27) is provided at one end of the transmission frame (24). The rack (27) passes through the inside of the guide channel (23). A gear (14) is also keyed to the surface of the drive shaft (10). The gear (14) is used to mesh with the rack (27).

Citation Information

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