Rigidity-variable passenger and freight car platform

Abstract

The invention discloses a variable-rigidity passenger and freight car platform which is composed of an upper-layer car platform body, a lower-layer car platform body and a connecting piece layer between the upper-layer car platform body and the lower-layer car platform body, and the connecting piece layer between the upper-layer car platform body and the lower-layer car platform body is a variable-rigidity switching layer. In the passenger state, sufficient rigidity and damping are provided, the passenger carrying requirement is met, meanwhile, vibration and noise are reduced, and the riding comfort is better. And in the freight state, higher rigidity is provided, and the passenger and freight dual-purpose requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of elevators, and in particular to a passenger and cargo elevator platform with variable rigidity. Background Art

[0002] Elevators can be divided into passenger elevators and freight elevators according to their uses. Passenger elevators need to consider the passenger comfort and have strict requirements on the damping of the car bottom, while freight elevators require the car bottom to provide greater rigidity, so the riding comfort of freight elevators is relatively poor. However, many projects such as industrial upstairs require elevators to meet the needs of both passenger and freight transportation, and existing passenger or freight elevators cannot meet the needs. Based on this, it is of great significance to develop a car bottom for both passengers and freight.

[0003] The corresponding public document numbers of the prior art are: CN106938818A, CN2286741Y, CN2041310U. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a car platform with variable rigidity, the rigidity of which can be changed according to different uses of carrying passengers and cargo.

[0005] To solve the above technical problems, the present invention provides a variable stiffness passenger and cargo car platform, which is composed of an upper car platform, a lower car platform and a connecting member layer between the upper and lower car platforms, and the connecting member layer between the upper and lower car platforms is a variable stiffness switching layer.

[0006] Preferably, the variable stiffness switching layer is composed of a hydraulic damper, a compression spring or an air chamber, and the hydraulic damper or the air chamber is controlled and adjusted by an electrical control system.

[0007] Preferably, the variable stiffness switching layer is of oil-gas spring connection type, comprising:

[0008] The oil-gas separation type oil-gas spring is composed of a cylinder body and a piston rod. The cylinder body is composed of an air chamber and an upper oil chamber and a lower oil chamber, which are separated by a rubber oil-gas chamber diaphragm in the middle. The lower end of the cylinder body and the piston rod base are fixedly connected to the lower car platform and the upper car platform respectively. The load in the car acts on the piston rod of the oil-gas spring through the upper car platform.

[0009] The inflation valve is opened by an electrical control system to charge air into the air chamber, adjust the pressure in the air chamber in real time, and switch the stiffness of the oil-gas spring.

[0010] Preferably, the variable stiffness switching layer further comprises a height control valve, which is controlled by an electrical control system to automatically adjust the inflation pressure of the air chamber of the oil-gas spring.

[0011] Preferably, the variable stiffness switching layer further comprises a damping valve, which is arranged between the upper oil chamber and the lower oil chamber, and the valve opening size is controlled by an electrical control system to achieve real-time adjustment of the car bottom damping.

[0012] Preferably, the gas filled into the air chamber by the inflation valve is nitrogen.

[0013] Preferably, the variable stiffness switching layer is composed of a combination of a compression spring and a hydraulic damper.

[0014] Preferably, the hydraulic damper includes a hydraulic piston, a hydraulic oil chamber, hydraulic oil, a throttle valve and a damping port. The hydraulic oil flows between the hydraulic oil chambers through the damping port, and the throttle valve controls the closing of the damping port. When the elevator is in a passenger-carrying state, the compression spring can provide sufficient support stiffness, and the hydraulic damper can provide damping. In the freight state, the throttle valve can be closed to prevent the hydraulic piston from moving downward, thereby improving the stiffness of the car bottom.

[0015] Preferably, the variable stiffness switching layer is composed of a compression spring and a magnetorheological fluid damper.

[0016] Preferably, the magnetorheological fluid damper includes a hydraulic piston, a hydraulic oil chamber, a magnetorheological fluid, a magnetorheological fluid channel and an excitation coil. The hydraulic oil chamber is filled with magnetorheological fluid, and the magnetorheological fluid channel in the piston flows in the oil chamber. The excitation coil is arranged in the piston. When power is turned on, the magnetorheological fluid in the piston can be controlled to achieve a rapid transition from liquid to solid, and the damping in the magnetorheological fluid oil chamber increases rapidly. The magnetic field strength of the excitation coil is adjusted by adjusting the current.

[0017] This patent invents a variable rigidity car platform, which can be switched between passenger and freight states by an electrical system. In the passenger state, it provides sufficient rigidity and damping to meet the passenger demand while reducing vibration and noise, providing better riding comfort. In the freight state, it provides greater rigidity to meet the needs of both passenger and freight use.

[0018] By adding a height control valve, the initial inflation pressure of the oil-gas spring air chamber or the damping of the hydraulic cylinder can be adjusted through the height control valve, so the height of the car bottom can be flexibly adjusted to ensure that the car bottom plane and the landing side remain level.

[0019] The hydraulic damper adds a throttle valve, and the valve opening size is electrically controlled to achieve real-time adjustment of the damping of the car bottom. The elevator is more comfortable when used for passengers, and actively reduces vibration and noise when used for freight. With the electrical control system, it can easily switch between passenger and freight states, and the load is monitored in real time through sensors, which can adjust the car bottom stiffness and damping to prevent the car bottom from tilting when the load is uneven. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0021] Figure 1 This is a schematic diagram of the oil-gas spring connected car platform.

[0022] Figure 2 This is a schematic diagram of a hydraulic spring-connected car platform.

[0023] Figure 3 This is a schematic diagram of the magnetorheological fluid hydraulic connection type car platform.

[0024] Description of Reference Numerals

[0025] 1 Oil-gas separation type oil-gas spring 2 Upper car floor 3 Lower deck 11 Cylinder 12 Piston rod 13 Inflatable valve 14 Air Chamber 15 Height control valve 16 Damping valve 17 Oiling chamber 18 Lower oil chamber 19 Rubber oil and gas chamber diaphragm 4 Compression spring 5 Hydraulic damper 51 Hydraulic oil 52 Hydraulic damping port 53 Throttle valve 54 Hydraulic oil chamber 55 Hydraulic piston 6 Magnetorheological fluid damper 61 Magnetorheological fluid 62 Magnetorheological fluid channel 63 Excitation coil DETAILED DESCRIPTION

[0026] The following describes the implementation methods of the present invention through specific specific embodiments, and those skilled in the art can fully understand other advantages and technical effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through different specific implementation methods, and the details in this specification can also be applied based on different viewpoints, and various modifications or changes can be made without deviating from the overall design concept of the invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other in the absence of conflict. The following exemplary embodiments of the present invention can be implemented in a variety of different forms and should not be interpreted as being limited to the specific embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary specific embodiments to those skilled in the art.

[0027] Figure 1The figure is a schematic diagram of a car bottom connected with an oil-gas spring. The present invention designs an oil-gas separation type oil-gas spring 1 for a car bottom, which is cylindrical in shape and consists of a cylinder body 11 and a piston rod 12. The cylinder body 11 consists of an air chamber 14, an upper oil chamber 17, a lower oil chamber 18, etc., separated by a rubber oil-gas chamber diaphragm 19 in the middle. The lower end of the cylinder body 11 and the base of the piston rod 12 are respectively fixed to the lower car bottom 3 and the upper car bottom 2 by bolts, and the load in the car acts on the piston rod 12 of the oil-gas spring through the upper car bottom 2. When the elevator switches from a passenger-carrying state to a cargo-carrying state, the electric control system controls the opening of the inflation valve 13 to rush high-pressure nitrogen into the air chamber 14. The pressure in the air chamber 14 increases, which can quickly increase the stiffness of the oil-gas spring 1. When the external load is balanced with the nitrogen pressure in the air chamber 14, the piston 12 stops moving. The height control valve 15 is controlled by the electrical system to automatically adjust the inflation pressure of the oil-gas spring chamber 14, and then the height of the car bottom can be flexibly adjusted to keep the car bottom plane and the floor station plane flush. A damping valve 16 is added between the upper oil chamber 17 and the lower oil chamber 18, and the valve opening size is controlled by the electrical control system to achieve real-time adjustment of the car bottom damping. The elevator is more comfortable when used for passengers, and it plays a role in actively reducing vibration and noise when used for freight.

[0028] Figure 2 This is a schematic diagram of a hydraulic spring-connected car platform, in which the upper car platform 2 and the lower car platform 3 are connected in the form of a combination of a compression spring 4 and a hydraulic damper 5. The hydraulic oil 51 flows between the hydraulic oil chamber 54 through the damping port 52, and the damping port 52 is closed by the throttle valve 53. In the passenger state, the elevator can provide sufficient support stiffness through the compression spring 4 and provide damping through the hydraulic damper 5. In the freight state, the throttle valve 53 can be closed to prevent the hydraulic piston 55 from moving downward, thereby improving the stiffness of the car platform and meeting the needs of both passenger and freight use. The hydraulic spring-connected car platform has a simple structure and is more convenient to control.

[0029] Figure 3 It is a schematic diagram of a magnetorheological fluid hydraulic connection type car bottom, which is mainly composed of a compression spring 4 and a magnetorheological fluid damper 6. Different from the hydraulic cylinder of Example 2, the magnetorheological fluid 61 filled in the hydraulic cylinder of the magnetorheological fluid damper 6 can flow in the oil chamber through the magnetorheological fluid channel 62 in the piston. There is an excitation coil 63 in the piston. When powered on, the magnetorheological fluid in the piston can be controlled to achieve a rapid transition from liquid to solid, and the damping in the magnetorheological hydraulic cylinder increases rapidly. By increasing the current, the magnetic field strength of the excitation coil 63 can be enhanced, thereby improving the stiffness of the entire magnetorheological fluid hydraulic cylinder to meet the needs of cargo loading. The difference from Example 2 is that the magnetorheological fluid damper has a faster response speed and a larger damping change, which can achieve instantaneous and accurate control of the damping force, good reversibility, wide rheological characteristics and easy control. The overall structure is simple, low power consumption, almost no collision, and low noise.

[0030] The present invention has been described in detail above through specific implementation modes and embodiments, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may also make many variations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. A variable stiffness passenger and cargo platform, characterized in that: It consists of an upper car platform, a lower car platform and a connecting member layer between the upper and lower car platforms. The connecting member layer between the upper and lower car platforms is a variable stiffness switching layer.

2. The variable stiffness passenger and cargo platform according to claim 1, characterized in that: The variable stiffness switching layer is composed of a hydraulic damper, a compression spring or an air chamber, and the hydraulic damper or the air chamber is controlled and adjusted by an electrical control system.

3. The variable stiffness passenger and cargo platform according to claim 2, characterized in that: The variable stiffness switching layer is of oil-gas spring connection type, comprising: The oil-gas separation type oil-gas spring is composed of a cylinder body and a piston rod. The cylinder body is composed of an air chamber and an upper oil chamber and a lower oil chamber, which are separated by a rubber oil-gas chamber diaphragm in the middle. The lower end of the cylinder body and the piston rod base are fixedly connected to the lower car platform and the upper car platform respectively. The load in the car acts on the piston rod of the oil-gas spring through the upper car platform. The inflation valve is opened by an electrical control system to charge air into the air chamber, adjust the pressure in the air chamber in real time, and switch the stiffness of the oil-gas spring.

4. The variable stiffness passenger and cargo platform according to claim 3, characterized in that: The variable stiffness switching layer also includes a height control valve, which is controlled by an electrical control system to automatically adjust the inflation pressure of the air chamber of the oil-gas spring.

5. The variable rigidity passenger and cargo platform according to claim 3, characterized in that: The variable stiffness switching layer also includes a damping valve, which is arranged between the upper oil chamber and the lower oil chamber. The valve opening size is controlled by an electrical control system to achieve real-time adjustment of the car bottom damping.

6. The variable rigidity passenger and cargo platform according to any one of claims 3 to 5, characterized in that: The gas filled into the air chamber by the inflation valve is nitrogen.

7. The variable rigidity passenger and cargo platform according to claim 2, characterized in that: The variable stiffness switching layer is composed of a compression spring and a hydraulic damper.

8. The variable rigidity passenger and cargo platform according to claim 7, characterized in that: The hydraulic damper includes a hydraulic piston, a hydraulic oil chamber, hydraulic oil, a throttle valve and a damping port. The hydraulic oil flows between the hydraulic oil chambers through the damping port, and the throttle valve controls the closing of the damping port. When the elevator is in a passenger-carrying state, the compression spring can provide sufficient support stiffness, and the hydraulic damper can provide damping. In a freight-carrying state, the throttle valve can be closed to prevent the hydraulic piston from moving downward, thereby improving the stiffness of the car bottom.

9. The variable rigidity passenger and cargo platform according to claim 2, characterized in that: The variable stiffness switching layer is composed of a compression spring and a magnetorheological fluid damper.

10. The variable rigidity passenger and cargo platform according to claim 9, characterized in that: The magnetorheological fluid damper includes a hydraulic piston, a hydraulic oil chamber, a magnetorheological fluid, a magnetorheological fluid channel and an excitation coil. The hydraulic oil chamber is filled with magnetorheological fluid, and the magnetorheological fluid channel in the piston flows in the oil chamber. The excitation coil is arranged in the piston. When power is turned on, the magnetorheological fluid in the piston can be controlled to achieve a rapid transition from liquid to solid, and the damping in the magnetorheological fluid oil chamber increases rapidly. The magnetic field strength of the excitation coil is adjusted by adjusting the current.

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