Elevator load detection vehicle

Abstract

The utility model relates to the technical field of elevator safety detection, in particular to an elevator load detection vehicle which comprises a chassis, a vehicle frame with three enclosure faces is fixedly arranged on the edge of the upper side of the chassis, driving steering wheels are arranged at the positions, close to the four corners, of the bottom of the chassis, damping mechanisms are arranged between the driving steering wheels and the chassis, and a lifting mechanism is arranged on the chassis. A telescopic mechanism is fixedly arranged on the upper side of the lifting mechanism, a weight tray is fixedly arranged at the output end of the telescopic mechanism, and the problems that an existing elevator load detecting and carrying mode is large in danger, high in cost and low in efficiency are solved through the design. According to the utility model, the counterweight can be accurately placed at a designated position in the elevator car, the detection accuracy is improved, the counterweight can be easily lifted to a required height through the arrangement of the lifting mechanism, the counterweight can enter the elevator car for a load test conveniently, and the automatic carrying mode is adopted, so that the detection efficiency is improved. The weight can be rapidly and accurately carried, and the elevator load detection process is more efficient and convenient.

Description

Technical Field

[0001] This utility model relates to the field of elevator safety inspection technology, specifically to an elevator load testing vehicle, which aims to improve the efficiency, safety and automation of elevator load testing. Background Technology

[0002] Elevators, as indispensable vertical transportation tools in modern buildings, are of paramount importance for safety. Overload testing is crucial in elevator inspection, primarily testing whether the elevator can operate normally under its rated load and whether its overload protection device functions effectively. An elevator should be able to issue a warning signal and stop immediately upon overload, halting the elevator car's movement. When the load inside the elevator car exceeds its rated capacity, the overload protection device is a necessary means to ensure the safety of passengers. According to relevant research, the failure rate of overload protection devices is 45.3%, indicating that the problem is widespread. The main reasons include improper car construction, damaged overload protection devices, misaligned overload protection devices, and deformation of the car structure.

[0003] Currently, the main method for detecting elevator overload protection is the load testing method. This method typically involves manually moving weights of fixed mass and specifications into the elevator car for load testing. Some tests use electric handcarts for load transport. However, these methods are inherently dangerous, costly, and inefficient. Therefore, developing an automated, efficient, and safe elevator load testing vehicle is of great significance. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an elevator load testing vehicle, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An elevator load testing vehicle includes a chassis, a frame with three-sided enclosure fixed to the upper edge of the chassis, drive steering wheels at the four corners of the bottom of the chassis, a shock absorption mechanism between the drive steering wheels and the chassis, a lifting mechanism on the chassis, a telescopic mechanism fixed to the upper side of the lifting mechanism, and a weight tray fixed to the output end of the telescopic mechanism.

[0007] Furthermore, the lifting mechanism includes a lifting platform, a scissor-type telescopic linkage, a hinge seat, a hydraulic cylinder, and a horizontal shaft. Two sets of scissor-type telescopic linkages are provided, both mounted on the chassis. The lower right ends of both sets of scissor-type telescopic linkages are hinged to the chassis via hinge seats. A lifting platform is provided on the upper side of both sets of scissor-type telescopic linkages. The lifting platform is hinged to the upper right ends of the scissor-type telescopic linkages via hinge seats. The two sets of scissor-type telescopic linkages are connected by a horizontal shaft. A hydraulic cylinder is provided on the chassis. The output end of the hydraulic cylinder is hinged to the horizontal shaft, and its other end is hinged to the chassis.

[0008] Furthermore, fork arm rollers are installed at the left ends of both the upper and lower sides of the scissor-type telescopic linkage. The upper fork arm roller is in contact with the lifting platform, and the lower fork arm roller is in contact with the chassis.

[0009] Furthermore, the telescopic mechanism includes an upper fork plate, an inner plate of the bottom fork plate, an outer plate of the bottom fork plate, a reduction motor, a first gear transmission group, a second gear transmission group, and a rack. The inner plate of the bottom fork plate and the outer plate of the bottom fork plate form the bottom fork plate. Two sets of bottom fork plates are symmetrically fixed on the lifting platform. A slidable middle fork plate is mounted on the upper side of each set of bottom fork plates. A slidable upper fork plate is mounted on the upper side of the middle fork plate. A telescopic groove adapted to the bottom fork plate is opened at the bottom of the middle fork plate. The middle fork plate is sleeved on the bottom fork plate through the telescopic groove. A rack is fixed inside the telescopic groove. A second gear transmission group is provided between the inner plate of the bottom fork plate and the outer plate of the bottom fork plate. The second gear transmission group is meshed and connected to the rack. A reduction motor is provided between the two sets of inner plates of the bottom fork plate. The output end of the reduction motor is connected to the input end of the second gear transmission group through a coupling.

[0010] Furthermore, a set of chains is provided on the upper and lower sides of the middle fork plate. One end of the upper chain is fixedly connected to the upper fork plate and the other end is fixedly connected to the middle fork plate. One end of the lower chain is fixedly connected to the middle fork plate and the other end is fixedly connected to the outer plate of the bottom fork plate.

[0011] Furthermore, multiple sets of second rollers are installed on the outer side of the bottom fork plate inner plate and the bottom fork plate outer plate near the upper edge. The telescopic groove on the middle fork plate is provided with a second sliding groove adapted to the second rollers. The middle fork plate is movably connected to the second rollers through the telescopic groove.

[0012] The middle fork plate has first sliding grooves on both the left and right sides. The upper fork plate has multiple sets of first rollers of the same specifications as the second rollers installed on both the left and right sides of its inner wall. The upper fork plate is movably connected to the first sliding grooves by the first rollers.

[0013] Furthermore, a first gear transmission group is provided between the inner plate and the outer plate of the bottom fork plate on the left side. The input end of the first gear transmission group is connected to a drive motor through a coupling, and the output end of the first gear transmission group is connected to a take-up roller. The take-up roller is located between the two sets of inner plates of the bottom fork plate. A twisted rope is wound on the take-up roller. One end of the twisted rope is fixed to the take-up roller, and the other end is fixed to the weight tray.

[0014] Furthermore, each of the two sets of upper fork plates is fixed with a conical plate with a pointed structure at its front end, and the two sets of conical plates are connected by a fixing rod.

[0015] Furthermore, the shock absorption mechanism consists of an upper connecting plate, a suspension base, a shock absorption spring, and telescopic rods. The upper connecting plate is fixedly connected to the chassis, and the suspension base is fixedly connected to the drive steering wheel. Four sets of telescopic rods are evenly distributed between the upper connecting plate and the suspension base, and each set of telescopic rods is fitted with a shock absorption spring.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This utility model improves the accuracy of testing by ensuring that the weights are accurately placed in the designated position inside the elevator car. Simultaneously, the lifting mechanism allows the weights to be easily raised to the required height for easy entry into the elevator car for load testing. The automated handling method enables rapid and accurate transport of the weights, improving testing efficiency and making the elevator load testing process more efficient and convenient. Furthermore, it enables automatic loading and unloading of weights by the elevator load testing vehicle, improving loading and unloading efficiency and reducing manpower consumption.

[0018] 2. The scissor-type telescopic linkage design in this utility model gives the lifting mechanism high stability and the ability to withstand large loads. The lifting platform can support and fix the telescopic mechanism and weight tray above, and has strong load-bearing capacity. The lifting height and speed of the lifting mechanism can be precisely controlled by the hydraulic system.

[0019] 3. This utility model improves the passability of the inspection vehicle by using drive steering wheels in conjunction with a shock absorption mechanism, and enhances the vehicle's load-bearing capacity and steering ability. When in a confined space, the four drive steering wheels work together to achieve omnidirectional movement. Compared with traditional trolleys, the four-steering-wheel chassis design greatly improves the flexibility of the inspection vehicle. The shock absorption mechanism absorbs vibrations and improves the stability of the inspection vehicle's movement, allowing it to pass smoothly over uneven surfaces. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2This is the right view of the present invention.

[0022] Figure 3 This is a schematic diagram of the telescopic mechanism in this utility model.

[0023] Figure 4 This is a partial disassembly diagram of the telescopic mechanism in this utility model.

[0024] Figure 5 This is a partial cross-sectional view of the telescopic mechanism in this utility model.

[0025] Figure 6 This is a schematic diagram of the bottom structure of the upper fork plate in this utility model.

[0026] Figure 7 This is a schematic diagram of the structure of the fork plate in this utility model.

[0027] Figure 8 This is a schematic diagram of the bottom structure of the fork plate in this utility model.

[0028] Figure 9 This is a schematic diagram of the lifting mechanism in this utility model.

[0029] Figure 10 This is a right view of the lifting mechanism in this utility model.

[0030] Figure 11 This is a schematic diagram of the bottom structure of the chassis in this utility model.

[0031] In the diagram: 1. Weight tray; 2. Telescopic mechanism; 21. Upper fork plate; 211. Conical plate; 212. Fixed rod; 213. First roller; 22. Middle fork plate; 221. First slide groove; 222. Telescopic groove; 223. Second slide groove; 224. Chain; 23. Inner plate of bottom fork plate; 24. Outer plate of bottom fork plate; 241. Second roller; 25. Gear motor; 251. Coupling; 26. Drive motor; 27. Take-up roller; 28. First gear transmission group; 29. ​​Second gear transmission group; 210. Rack; 3. Frame; 4. Lifting mechanism; 41. Lifting platform; 42. Scissor-type telescopic linkage; 43. Hinge seat; 44. Hydraulic cylinder; 45. Horizontal shaft; 46. Fork arm roller; 5. Chassis; 6. Drive steering wheel; 61. Shock absorption mechanism. Detailed Implementation

[0032] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0033] Example:

[0034] like Figures 1 to 11 As shown, an elevator load testing vehicle includes a chassis 5. A three-sided enclosed frame 3 is fixed to the upper edge of the chassis 5. The chassis 5 serves as the supporting foundation for the entire testing vehicle, and together with the three-sided enclosed frame 3, it provides a stable working platform and safety protection. Drive steering wheels 6 are provided at the bottom of the chassis 5 near the four corners for flexible movement of the testing vehicle. A shock-absorbing mechanism 61 is provided between the drive steering wheels 6 and the chassis 5 to effectively reduce vibration during driving, allowing the testing vehicle to pass smoothly over uneven roads and improving driving stability. A lifting mechanism 4 is provided on the chassis 5, which hydraulically moves the lifting platform 41 up and down. The lifting mechanism 4 allows the weights to be lifted... It can be easily lifted to the required height, facilitating entry into the elevator car for load testing. A telescopic mechanism 2 is fixedly installed on the upper side of the lifting mechanism 4. The telescopic mechanism 2 allows the weights to be accurately placed in the designated position inside the elevator car, improving the accuracy of the test. A weight tray 1 is fixedly installed on the output end of the telescopic mechanism 2 for carrying and transporting the weights. This design solves the problem that existing elevator load testing usually relies on manual handling of weights. Weights of fixed specifications and mass that have been metrologically verified or calibrated are transported to the elevator car for load testing. Some tests use electric handcarts for load handling. These handling methods are dangerous, costly, and inefficient.

[0035] In this embodiment, the lifting mechanism 4 includes a lifting platform 41, a scissor-type telescopic link 42, a hinge seat 43, a hydraulic cylinder 44, and a horizontal shaft 45. Two sets of scissor-type telescopic links 42 are provided, both mounted on the chassis 5. The lower right ends of both sets of scissor-type telescopic links 42 are hinged to the chassis 5 via the hinge seat 43. A lifting platform 41 is provided on the upper side of the two sets of scissor-type telescopic links 42 to support and fix the telescopic mechanism 2 and the weight tray 1 above. The lifting platform 41 is hinged to the upper right end of the scissor-type telescopic link 42 via the hinge seat 43, enabling vertical movement. The two sets of scissor-type telescopic links 42 are connected by the horizontal shaft 45. A hydraulic cylinder 44 is provided on the chassis 5. The output end of the hydraulic cylinder 44 is hinged to the horizontal shaft 45, and its other end is hinged to the chassis 5. When the hydraulic cylinder 44 drives the horizontal shaft 45 to move, the scissor-type telescopic link 42 will extend or retract, thereby driving the lifting platform 41 to move vertically. The lifting platform 41 is moved up and down by hydraulic pressure. The lifting mechanism 4 is designed so that the weights can be easily lifted to the required height, making it convenient to enter the elevator car for load testing.

[0036] When the hydraulic system is activated, the hydraulic cylinder 44 generates pressure, driving the horizontal shaft 45 to move. The movement of the horizontal shaft 45 causes the two sets of scissor-type telescopic linkages 42 to extend or retract synchronously. Since the scissor-type telescopic linkages 42 are connected to the lifting platform 41 via hinge seats 43, the extension or retraction of the scissor-type telescopic linkages 42 causes the lifting platform 41 to move up and down. By controlling the pressure and direction of the hydraulic system, the lifting height and speed of the lifting platform 41 can be precisely controlled.

[0037] The design of the scissor-type telescopic linkage 42 gives the lifting mechanism 4 high stability and the ability to withstand large loads. The lifting platform 41 can support and fix the telescopic mechanism 2 and the weight tray 1 above, and has a strong load-bearing capacity. The lifting height and speed of the lifting mechanism 4 can be precisely controlled by the hydraulic system.

[0038] In this embodiment, fork arm rollers 46 are installed at the left ends of both the upper and lower sides of the scissor-type telescopic link 42. The upper fork arm roller 46 is in contact with the lifting platform 41, and the lower fork arm roller 46 is in contact with the chassis 5. As a rolling element, the fork arm roller 46 can significantly reduce the friction between the scissor-type telescopic link 42 and the lifting platform 41 and chassis 5, which helps to reduce frictional resistance during the lifting process and improve lifting efficiency. The contact connection between the fork arm roller 46 and the lifting platform 41 and chassis 5 forms a stable support point. At the same time, during the lifting process, the fork arm roller 46 can maintain the relative position stability between the scissor-type telescopic link 42 and the lifting platform 41 and chassis 5, preventing displacement due to friction or external force.

[0039] During the lifting process, the hydraulic cylinder 44 drives the horizontal shaft 45 to move, which in turn extends or retracts the scissor-type telescopic linkage 42. The fork arm rollers 46 roll on the lifting platform 41 and the chassis 5, providing stable support and guidance to ensure the smooth lifting of the lifting platform 41. At the same time, the design of the fork arm rollers 46 reduces friction and wear, improving the durability and efficiency of the lifting mechanism 4.

[0040] In this embodiment, the telescopic mechanism 2 includes an upper fork plate 21, a bottom fork plate inner plate 23, a bottom fork plate outer plate 24, a reduction motor 25, a first gear transmission group 28, a second gear transmission group 29, and a rack 210. The bottom fork plate inner plate 23 and the bottom fork plate outer plate 24 form the bottom fork plate. Two sets of bottom fork plates are symmetrically fixed on the lifting platform 41 to provide stable support for the telescopic mechanism 2. Each set of bottom fork plates is equipped with a slidable middle fork plate 22 on its upper side, which serves to connect and transmit motion and drive the upper fork plate 21 to move. The middle fork plate 22 is equipped with a slidable upper fork plate 21 on its upper side for supporting and fixing the weight tray 1. The bottom of the middle fork plate 22 has an opening. A telescopic groove 222 is adapted to the bottom fork plate. The middle fork plate 22 is fitted onto the bottom fork plate through the telescopic groove 222. The upper fork plate 21 can slide on the middle fork plate 22 to achieve telescopic movement. A rack 210 is fixed inside the telescopic groove 222. A second gear transmission group 29 is provided between the inner plate 23 and the outer plate 24 of the bottom fork plate. The second gear transmission group 29 is meshed with the rack 210 for transmission. The rack 210 converts the rotational motion of the gear transmission group into the linear telescopic motion of the middle fork plate 22. A reduction motor 25 is provided between the two sets of inner plates 23 of the bottom fork plate. The output end of the reduction motor 25 is connected to the input end of the second gear transmission group 29 through a coupling 251. The telescopic mechanism 2 enables the weight to be accurately placed in the designated position in the elevator car, improving the accuracy of detection and realizing automatic loading and unloading of the weight.

[0041] When the geared motor 25 starts, its output end transmits rotational power to the second gear transmission group 29 through the coupling 251. The second gear transmission group 29 is meshed with the rack 210, converting the rotational power into linear motion of the rack 210. The rack 210 is fixed inside the telescopic groove 222 at the bottom of the middle fork plate 22, so the linear motion of the rack 210 causes the middle fork plate 22 to slide on the bottom fork. At the same time, since the upper fork is mounted on the upper side of the middle fork plate 22 and can slide, the telescopic movement of the middle fork plate 22 will also drive the upper fork plate 21 to move together. By controlling the rotational speed of the geared motor 25, the telescopic speed of the telescopic mechanism 2 can be precisely controlled, and the weight tray 1 can be accurately extended or retracted according to the detection requirements.

[0042] In this embodiment, a set of chains 224 is provided on the upper and lower sides of the middle fork plate 22. One end of the upper chain 224 is fixedly connected to the upper fork plate 21, and the other end is fixedly connected to the middle fork plate 22. One end of the lower chain 224 is fixedly connected to the middle fork plate 22, and the other end is fixedly connected to the outer plate 24 of the bottom fork plate. The upper fork plate 21 is extended through the chain drive of the two sets of chains 224, which can drive the upper fork plate 21 to extend and retract at the same time as the middle fork plate 22 extends and retracts.

[0043] In this embodiment, multiple sets of second rollers 241 are installed on the outer side of the bottom fork plate inner plate 23 and the bottom fork plate outer plate 24 near the upper edge. The telescopic groove 222 on the middle fork plate 22 is provided with a second sliding groove 223 that is adapted to the second rollers 241. The middle fork plate 22 is movably connected to the second rollers 241 through the telescopic groove 222.

[0044] In this embodiment, the middle fork plate 22 has first sliding grooves 221 on both its left and right sides. The upper fork plate 21 has multiple sets of first rollers 213 of the same specifications as the second rollers 241 installed on both its left and right inner walls. The upper fork plate 21 is movably connected to the first fork plate by engaging the first rollers 213 into the first sliding grooves 221. During the extension and retraction process, when the reduction motor 25 drives the gear transmission group and rack 210, the middle fork plate 22 slides on the bottom fork plate through the cooperation of the second rollers 241 and the second sliding grooves 223. Simultaneously, the upper fork plate 21 slides on the middle fork plate 22 through the cooperation of the first rollers 213 and the first sliding grooves 221. This design makes the movement of the extension mechanism 2 smoother and more stable, reduces friction and wear, and improves the durability and efficiency of the mechanism.

[0045] In this embodiment, a first gear transmission group 28 is provided between the inner plate 23 and the outer plate 24 of the left bottom fork plate. The input end of the first gear transmission group 28 is connected to a drive motor 26 via a coupling 251, and the output end of the first gear transmission group 28 is connected to a take-up roller 27. The take-up roller 27 is located between the two sets of inner plates 23 of the bottom fork plate, and a twisted rope is wound on the take-up roller 27. One end of the twisted rope is fixed to the take-up roller 27, and the other end is fixed to the weight tray 1. This design enables the drive motor 26 to drive the take-up roller 27 to rotate, thereby winding up the twisted rope on the take-up roller 27. The twisted rope then drags the weight tray 1 onto the telescopic fork, realizing the automatic loading and unloading of the weight tray 1. When the drive motor 26 starts, its output end transmits rotational power to the first gear transmission group 28 through the coupling 251. The first gear transmission group 28 transmits rotational power to the take-up roller 27, causing the take-up roller 27 to start rotating. Depending on the rotation direction of the take-up roller 27, the rope can be wound up or unwound, realizing automatic loading and unloading of the weight tray 1.

[0046] In this embodiment, each of the two sets of upper fork plates 21 is fixedly provided with a conical plate 211 with a pointed structure at its front end, and the two sets of conical plates 211 are connected by a fixing rod 212. The conical plate 211 helps to reduce the contact area with the weight tray 1 when the telescopic mechanism 2 extends or retracts, thereby reducing frictional resistance and improving automatic loading and unloading efficiency.

[0047] In this embodiment, the shock absorption mechanism 61 consists of an upper connecting plate, a suspension base, shock-absorbing springs, and telescopic rods. The upper connecting plate is fixedly connected to the chassis 5, and the suspension base is fixedly connected to the drive steering wheel 6. Four sets of telescopic rods are evenly distributed between the upper connecting plate and the suspension base, and each set of telescopic rods is fitted with a shock-absorbing spring. The shock absorption mechanism 61 absorbs vibrations, improving the stability of the inspection vehicle and allowing it to pass smoothly over uneven surfaces. When the chassis 5 or the drive steering wheel 6 is subjected to vibration or impact, this force is transmitted to the telescopic rods and shock-absorbing springs through the upper connecting plate and the suspension base. The shock-absorbing springs compress or stretch to absorb and buffer this force, thereby reducing the impact of vibration on the drive steering wheel 6 and the chassis 5. At the same time, the telescopic rods extend and retract within a certain range to adapt to the relative movement between the chassis 5 and the drive steering wheel 6, maintaining the stability of the shock absorption mechanism 61.

[0048] It should be noted that the elevator load testing vehicle is controlled by an electronic control system, which mainly includes a main control unit, sensor modules, safety protection modules, and motion control modules. The main control unit is the core module of the testing vehicle control system, controlling the vehicle's operation through communication with other units. The mode selection module allows on-site personnel to choose a convenient control mode for different usage scenarios. The sensor modules are responsible for feeding back environmental information, speed signals, and deviation information from the testing vehicle to the control system. The safety protection module is mainly used to alarm for vehicle malfunctions, and the emergency stop switch immediately cuts off power and stops operation in case of a malfunction. The motion control module controls the vehicle's movement by controlling the steering and travel motors. The power supply module provides continuous power to all the above modules.

[0049] The main control unit primarily handles data reception, logic processing, and command issuance to ensure the safe and stable operation of the entire heavy object transportation process. After program startup, it automatically initializes the clock system, input / output interfaces, various communication interfaces, and related peripherals. Upon initialization, the control system automatically performs vehicle status detection. If the vehicle is in an abnormal state, an alarm command is sent to the safety protection module; otherwise, the program continues execution. Once the control system is confirmed to be operating normally, it begins reading hardware information, determines the target path based on the operating commands issued under different control modes, and simultaneously receives error data feedback from the sensor units. This data is then processed by the path tracking controller to obtain vehicle motion control commands. These vehicle control commands are decoupled through a kinematic model to obtain motor control commands, which are then sent to the motion control module.

[0050] The main controller used in this invention is an STM32F103ZET6 chip from STMicroelectronics.

[0051] The sensor module includes an obstacle avoidance sensor and an RFID landmark sensor. The RFID landmark sensor is installed on the chassis 5 of the vehicle and is used in conjunction with the RFID card. The obstacle avoidance sensor is used to detect the external environment. When an obstacle is detected, the vehicle executes an automatic stopping or deceleration procedure based on the distance to the obstacle. The vehicle's running status information is fed back by the RFID landmark sensor, which is used to read path node information.

[0052] The motion control module is the execution module for the detection vehicle to achieve various motion states. Based on the pose error obtained by the sensor, the control quantity of the vehicle center point is calculated. After being decoupled to each drive wheel 6 by the motion model of the detection vehicle, the control quantity of each drive wheel 6 motor is finally obtained. The main control unit sends these control quantities to the drive wheel 6 to complete the execution of the received task.

[0053] The safety protection module is primarily used for handling faults during vehicle operation. After system initialization, the control system automatically detects the vehicle's status, categorizing it into normal operation, warning, and error states. When problems such as derailment, obstacle proximity, or motor failure occur during vehicle operation, the system enters an error state, the vehicle automatically stops, and a voice broadcast announces the error; the indicator light turns red. When the vehicle is low on battery or detects an obstacle, it reacts accordingly and issues a warning via voice broadcast; the indicator light turns yellow in this state. During normal operation, the three-color alarm light is green. Voice database entries need to be pre-set. Corresponding prompts are provided for different detection states to remind on-site personnel to handle them promptly. In case of unpredictable emergencies during operation, the emergency stop switch can be pressed, immediately de-energizing the vehicle and stopping operation.

[0054] The working principle of this type of elevator load testing vehicle:

[0055] In actual use, first check whether all parts of the testing vehicle are intact, ensuring that the hydraulic system, electrical control system, drive wheel 6, etc. are working properly. Select appropriate weights according to the testing requirements and place them on the weight tray 1. Start the testing vehicle through the control panel of the electrical control system and select the appropriate control mode. The testing vehicle performs a self-check to ensure that all systems are operating normally. Use the drive wheel 6 to control the testing vehicle to move near the elevator car. Obstacle avoidance sensors detect the surrounding environment to ensure safe movement. Drive the lifting mechanism 4 through the hydraulic cylinder 44 to raise the weights to the same height as the elevator car. The scissor-type telescopic linkage 42 and the fork roller 46 ensure the smoothness of the lifting process. Use the telescopic mechanism 2 to accurately extend the weight tray 1 into the designated position inside the elevator car. The gear transmission group and rack 210 ensure precise control of the telescopic process. Conduct a load test inside the elevator car and record relevant data. If the weight position needs to be adjusted, the telescopic mechanism 2 can be used again for adjustment. After completing the test, use the telescopic mechanism 2 to retract the weight tray 1. Use the lifting mechanism 4 to lower the weights back to the initial position.

[0056] During loading, the drive motor 26 drives the second gear transmission group 29 to rotate, which in turn drives the rack 210 to move, causing the middle fork plate 22 in the telescopic mechanism 2 to extend. At this time, the chain 224 causes the upper fork plate 21 to extend through chain drive. Because the upper fork is faster than the middle fork, it extends a longer distance. The three-stage telescopic structure allows the telescopic mechanism 2 to extend a longer distance while ensuring operational safety. Simultaneously, the target object is dragged onto the telescopic fork by the winch rope, and the telescopic mechanism 2 retracts. Then, the hydraulic cylinder 44 in the lifting mechanism 4 is activated. The reciprocating motion of the hydraulic cylinder 44 is converted into the movement of the horizontal shaft 45, which is further converted into the lifting motion of the scissor-type telescopic linkage 42, thereby realizing the lifting of the lifting platform 41 and the automatic loading and unloading of the weight tray 1.

[0057] In summary, this elevator load testing vehicle can automatically load and unload weights, efficiently and accurately complete load tests on elevator cars, improve loading and unloading efficiency, reduce manpower consumption, enhance the safety and efficiency of testing, thereby reducing labor costs and improving economic benefits.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. An elevator load testing vehicle, comprising a chassis (5), characterized in that: The chassis (5) is fixed with a three-sided enclosure frame (3) at the upper edge. The chassis (5) is provided with drive steering wheels (6) at the four corners near the bottom. A shock absorption mechanism (61) is provided between the drive steering wheels (6) and the chassis (5). The chassis (5) is provided with a lifting mechanism (4). A telescopic mechanism (2) is fixed on the upper side of the lifting mechanism (4). A weight tray (1) is fixed on the output end of the telescopic mechanism (2).

2. The elevator load testing vehicle according to claim 1, characterized in that: The lifting mechanism (4) includes a lifting platform (41), a scissor telescopic link (42), a hinge seat (43), a hydraulic cylinder (44), and a horizontal shaft (45). The scissor telescopic link (42) is provided in two sets and is set on the chassis (5). The lower right end of the two sets of scissor telescopic links (42) is hinged to the chassis (5) through the hinge seat (43). The upper side of the two sets of scissor telescopic links (42) is provided with a lifting platform (41). The lifting platform (41) is hinged to the upper right end of the scissor telescopic link (42) through the hinge seat (43). The two sets of scissor telescopic links (42) are connected by a horizontal shaft (45). The chassis (5) is provided with a hydraulic cylinder (44). The output end of the hydraulic cylinder (44) is hinged to the horizontal shaft (45), and its other end is hinged to the chassis (5).

3. The elevator load testing vehicle according to claim 2, characterized in that: The upper and lower left ends of the scissor-type telescopic linkage (42) are equipped with fork arm rollers (46). The upper fork arm roller (46) is in contact with the lifting platform (41), and the lower fork arm roller (46) is in contact with the chassis (5).

4. The elevator load testing vehicle according to claim 3, characterized in that: The telescopic mechanism (2) includes an upper fork plate (21), a bottom fork plate inner plate (23), a bottom fork plate outer plate (24), a reduction motor (25), a first gear transmission group (28), a second gear transmission group (29), and a rack (210). The bottom fork plate inner plate (23) and the bottom fork plate outer plate (24) form the bottom fork plate. The bottom fork plate has two sets and is symmetrically fixed on the lifting platform (41). Each set of bottom fork plates is equipped with a slidable middle fork plate (22) on its upper side. The middle fork plate (22) is equipped with a slidable upper fork plate (21) on its upper side. The bottom of the middle fork plate (22) is provided with a telescopic groove (222) that matches the bottom fork plate. The fork plate is fitted with a telescopic groove (222), and a rack (210) is fixed inside the telescopic groove (222). A second gear transmission group (29) is provided between the inner plate (23) and the outer plate (24) of the fork plate. The second gear transmission group (29) is meshed with the rack (210) for transmission. A reduction motor (25) is provided between the two sets of inner plates (23) of the fork plate. The output end of the reduction motor (25) is connected to the input end of the second gear transmission group (29) through a coupling (251).

5. The elevator load testing vehicle according to claim 4, characterized in that: A set of chains (224) is provided on the upper and lower sides of the middle fork plate (22). One end of the upper chain (224) is fixedly connected to the upper fork plate (21), and the other end is fixedly connected to the middle fork plate (22). One end of the lower chain (224) is fixedly connected to the middle fork plate (22), and the other end is fixedly connected to the outer plate (24) of the bottom fork plate.

6. The elevator load testing vehicle according to claim 4, characterized in that: Multiple sets of second rollers (241) are installed on the outer side of the bottom fork plate inner plate (23) and the bottom fork plate outer plate (24) near the upper edge. The telescopic groove (222) on the middle fork plate (22) is provided with a second sliding groove (223) that is adapted to the second rollers (241). The middle fork plate (22) is movably connected to the second rollers (241) through the telescopic groove (222). The middle fork plate (22) has first sliding grooves (221) on both the left and right sides. The upper fork plate (21) has multiple sets of first rollers (213) of the same specifications as the second roller (241) installed on both the left and right sides of its inner wall. The upper fork plate (21) is movably connected to the first sliding groove (221) by the first rollers (213).

7. The elevator load testing vehicle according to claim 4, characterized in that: A first gear transmission group (28) is provided between the inner plate (23) and the outer plate (24) of the bottom fork plate on the left side. The input end of the first gear transmission group (28) is connected to a drive motor (26) through a coupling (251). The output end of the first gear transmission group (28) is connected to a take-up roller (27). The take-up roller (27) is located between the two sets of inner plates (23) of the bottom fork plate. A twisted rope is wound on the take-up roller (27). One end of the twisted rope is fixed on the take-up roller (27), and the other end is fixed on the weight tray (1).

8. The elevator load testing vehicle according to claim 4, characterized in that: Both sets of upper fork plates (21) are fixed with a cone plate (211) with a pointed structure at their front ends, and the two sets of cone plates (211) are connected by a fixing rod (212).

9. The elevator load testing vehicle according to claim 1, characterized in that: The shock absorption mechanism (61) consists of an upper connecting plate, a suspension base, a shock absorption spring, and a telescopic rod. The upper connecting plate is fixedly connected to the chassis (5), and the suspension base is fixedly connected to the drive steering wheel (6). Four sets of telescopic rods are evenly distributed between the upper connecting plate and the suspension base, and each set of telescopic rods is fitted with a shock absorption spring.

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