Self-balancing type elevator car

Abstract

The invention discloses a self-balancing elevator car, which belongs to the technical field of elevators, and is characterized in that a balancing assembly is arranged in a car body and comprises a central balancing weight, a plurality of balancing units distributed in an annular array, electromagnets matched with the balancing units, and a pressure sensor on an inner chassis; real-time monitoring and dynamic adjustment of weight distribution in the elevator are achieved, when the balance of the elevator is reduced due to uneven distribution of passengers, the controller can control the electromagnet to be started according to signals of the pressure sensor, the balance unit is driven to move to the designated position, and therefore balance adjustment of the weight of the elevator is achieved; the balance and the stability of the elevator are improved, the burden of the mechanical structure of the elevator caused by shaking and inclining is reduced, and the service life of the elevator is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, and more particularly to a self-balancing elevator car. Background Art

[0002] With the acceleration of urbanization, elevators, as an indispensable vertical transportation tool in modern buildings, are increasingly attracting attention for their safety, comfort and energy efficiency. Traditional elevator car design often focuses on load-bearing capacity and operating efficiency, but pays less attention to the balance inside the car, the passenger experience, and the safety warning mechanism during elevator operation. Especially in high-rise buildings, the shaking and tilting of elevator cars caused by uneven distribution of passengers during operation not only affect the comfort of passengers, but also pose a potential threat to the safety of elevator operation.

[0003] First, the problem of elevator balance caused by uneven distribution of passengers is a common phenomenon. During the operation of the elevator, passengers often choose to stand in different positions in the car according to their needs, which may cause uneven weight distribution of the car, resulting in shaking and tilting. This shaking not only affects the passengers' riding experience, but also may cause additional burden on the mechanical structure of the elevator, accelerating its wear and aging.

[0004] Secondly, the safety warning mechanism during elevator operation is not perfect. Traditional elevator safety systems mainly rely on sensors and controllers to monitor the elevator operation status in real time. Once a fault or abnormal situation occurs, the system will immediately initiate protective measures, such as stopping operation and sounding an alarm. However, this post-processing method cannot effectively prevent the occurrence of elevator accidents, especially when it comes to elevator balance problems caused by uneven passenger distribution, and there is a lack of effective warning and intervention mechanisms.

[0005] Therefore, in view of the above-mentioned technical problems, it is necessary to provide a self-balancing elevator car. Summary of the invention

[0006] The object of the present invention is to provide a self-balancing elevator car to solve the above-mentioned problems.

[0007] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0008] A self-balancing elevator car comprises a car body, a balancing assembly and an inner chassis, wherein a balancing cavity is opened at the base of the car body, the balancing assembly is installed in the balancing cavity, the balancing assembly comprises a central counterweight block fixedly installed at the center position of the balancing cavity, a plurality of balancing units distributed in a circular array are slidably installed on the outer side of the central counterweight block, a plurality of electromagnets corresponding to the balancing units are fixedly installed on the side wall of the balancing cavity, the inner chassis is fixedly installed above the inner base of the car body, and the inner chassis comprises a plurality of evenly distributed chassis units.

[0009] As a further improvement of the present invention, the chassis unit includes a docking frame, the inner end of the docking frame is fixedly connected to a core plate, the upper end of the core plate is fixedly installed with a panel, a pressure sensor is installed between the panel and the core plate, the pressure sensor signal is connected to a controller, the controller is electrically connected to the electromagnet, the pressure sensor is used to detect the pressure on the panel in the corresponding area, and send the pressure signal to the controller, and then the controller calculates the balancing mode of the balancing component according to the pressure value and position.

[0010] As a further improvement of the present invention, an extrusion groove is provided at the lower end of the core plate, and a matching pressure block is slidably installed at the opening of the extrusion groove. An elastic liquid bag is fixedly connected between the pressure block and the top wall of the extrusion groove, and the elastic liquid bag is filled with a color-developing liquid. An annular color-developing cavity is provided inside the docking frame, and the elastic liquid bag is connected to the annular color-developing cavity through a plurality of evenly distributed infusion tubes. When the balancing unit in the balancing assembly is driven by the electromagnet and moves to the designated area, the pressure block on the chassis unit in the area will be squeezed, forcing it to push the color-developing liquid in the elastic liquid bag through the infusion tube into the annular color-developing cavity for color development, thereby prompting and guiding other users to stand in this area to balance the pressure. After balancing by the user's weight, the electromagnet can be turned off to save energy.

[0011] As a further improvement of the present invention, the balancing unit includes a balancing block, a slider, a magnet block and an extrusion block. The slider is fixedly connected to the lower end of the balancing block. A plurality of slide grooves matching the extrusion block are provided at the bottom of the balancing cavity, and the slider is slidably installed in the slide groove. The magnet block is inlaid and installed on the balancing block. The extrusion block is fixedly connected to the upper end of the balancing block. The magnet block can be moved by being attracted or repelled by the electromagnet. The slider is used to limit the moving trajectory of the balancing block so that it can accurately balance the weight. The extrusion block is used to cooperate with the pressure block to extrude it.

[0012] As a further improvement of the present invention, the ends of the extrusion block and the pressure block that are close to each other are both arc-surface structures, and a spring is fixedly connected between the sliding block and the side wall of the sliding groove.

[0013] As a further improvement of the present invention, a pair of symmetrically distributed annular color-control sheets are fixedly installed inside the annular color-developing cavity, the cross-sectional shape of the pair of annular color-control sheets is trumpet-shaped, and the distance between them gradually decreases from top to bottom, the docking frame is made of transparent material, and the annular color-control sheets are made of non-transparent material. The pair of annular color-control sheets with a trumpet-shaped structure can make the color-developing liquid present a gradually thickening "color-developing ring" as the liquid level rises after entering the cavity, and the prompt effect is more obvious. Even if part of the color-developing liquid enters the annular color-developing cavity due to the shaking of the elevator, the narrow space below the pair of annular color-control sheets can block a certain field of view, and false prompts are less likely to occur.

[0014] As a further improvement of the present invention, a plurality of evenly distributed reflective floats are provided between a pair of the annular color-control sheets, and an elastic pull rope is fixedly connected between the reflective floats and the annular color-control sheets. Under normal conditions, the reflective floats are located at the lower openings of a pair of annular color-control sheets. When the color-developing liquid enters, the reflective floats can rise with the liquid level relying on the buoyancy effect, and cooperate with the original lights in the car body to achieve a reflective effect, thereby further improving the prompting effect for users. When the elevator shakes, the reflective floats will shake synchronously at the liquid surface, and then cooperate with the lights to achieve a flashing effect, thereby prompting users that the elevator is shaking, and the greater the elevator shakes, the more obvious the flashing effect of the reflective floats will be.

[0015] As a further improvement of the present invention, the reflective float includes a core ball, a floating block and a reflective film. The floating block is fixedly connected to the upper end of the core ball and together constitute a spherical structure. The reflective film is coated on the outer surface of the core ball. The reflective film reflects the light and has a special flashing effect when combined with the color-developing liquid. The floating block can ensure that the reflective float as a whole can rise with the liquid level of the color-developing liquid, while the core ball can stabilize the posture of the reflective float to prevent it from moving due to very slight shaking under normal conditions, thereby causing the flashing effect to cause discomfort without prompting the user.

[0016] As a further improvement of the present invention, the diameter of the reflective floating ball is greater than the minimum distance between a pair of annular color control sheets, and the floating block is made of a lightweight buoyancy material.

[0017] As a further improvement of the present invention, the color-developing liquid is a colored translucent oil liquid, and the surfaces of the docking frame and the annular color control film are coated with a nano-oleophobic coating. The colored translucent oil liquid not only has good light transmittance, but can also cooperate with the reflective film to achieve a good reflective and flashing effect. At the same time, it has high fluidity and is not easy to adhere to the docking frame and the annular color control film to cause residual color development.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] (1) The present invention realizes real-time monitoring and dynamic adjustment of the weight distribution inside the elevator by arranging a balancing assembly inside the car body, including a central counterweight block and a plurality of balancing units distributed in a circular array, as well as electromagnets and pressure sensors on the inner chassis that cooperate with the balancing assembly. When the balance of the elevator decreases due to uneven distribution of passengers, the controller will control the electromagnet to start according to the signal of the pressure sensor, and drive the balancing unit to move to the specified position, thereby realizing the balance adjustment of the elevator weight. This not only improves the balance and stability of the elevator, but also reduces the burden on the elevator mechanical structure due to shaking and tilting, thereby extending the service life of the elevator.

[0020] (2) The present invention arranges a plurality of evenly distributed chassis units on the inner chassis. Each chassis unit is equipped with a pressure sensor and a color display device. The distribution of passengers can be monitored in real time and prompts can be given. When a passenger stands on a chassis unit, the corresponding color display device will light up to guide other passengers to stand in that area to balance their weight. This not only improves the riding experience of the passengers, but also enhances the safety of the elevator. At the same time, when the elevator shakes or tilts, the flashing effect of the color display device and the reflective float will promptly remind passengers to pay attention to safety, thereby avoiding accidents caused by the shaking of the elevator.

[0021] (3) The present invention monitors the operating status of the elevator in real time by installing sensors and monitoring equipment, and sets up safety warning devices such as reflective floats. When the elevator experiences abnormal conditions such as shaking or tilting, these devices will promptly sound an alarm and give prompts, allowing passengers to quickly take countermeasures. At the same time, these warning information can also be transmitted to the elevator maintenance personnel through the network so that they can promptly discover and handle elevator failures, thereby improving the safety and reliability of the elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the balancing component part of the present invention;

[0024] Figure 3 A cross-sectional view of the balance component of the present invention;

[0025] Figure 4 It is an exploded schematic diagram of the chassis unit of the present invention;

[0026] Figure 5 is a cross-sectional view of a chassis unit of the present invention;

[0027] Figure 6 For the present invention Figure 5 The structural diagram at A in the middle;

[0028] Figure 7It is a cross-sectional view of the reflective floating ball of the present invention;

[0029] Figure 8 It is a schematic diagram of the change of the "color ring" before and after tilting of the present invention.

[0030] Description of the numbers in the figure:

[0031] 1. Car body; 2. Chassis unit; 201. Docking frame; 202. Panel; 203. Pressure sensor; 204. Core plate; 205. Pressure block; 206. Infusion tube; 207. Elastic liquid sac; 3. Central counterweight block; 4. Balance unit; 401. Balance block; 402. Sliding block; 403. Magnet block; 404. Extrusion block; 5. Electromagnet; 6. Spring; 7. Ring color control sheet; 8. Reflective float; 801. Core ball; 802. Floating block; 803. Reflective film; 9. Elastic pull rope. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0033] The first implementation method:

[0034] See also Figure 1-8 A self-balancing elevator car includes a car body 1, a balancing component and an inner chassis. A balancing cavity is opened at the base of the car body 1, and the balancing component is installed in the balancing cavity. The balancing component includes a central counterweight block 3 fixedly installed at the center position of the balancing cavity, and a plurality of balancing units 4 distributed in a circular array are slidably installed on the outer side of the central counterweight block 3. A plurality of electromagnets 5 corresponding to the balancing units 4 are fixedly installed on the side wall of the balancing cavity. The inner chassis is fixedly installed above the inner base of the car body 1, and the inner chassis includes a plurality of evenly distributed chassis units 2.

[0035] Since the present invention directly refits the solid base portion of the existing car, the balancing assembly does not cause a significant increase in weight, and has little impact on the load-bearing capacity of the original car.

[0036] The chassis unit 2 includes a docking frame 201, the inner end of which is fixedly connected to a core plate 204, the upper end of which is fixedly installed with a panel 202, a pressure sensor 203 is installed between the panel 202 and the core plate 204, the pressure sensor 203 signal is connected to a controller, the controller is electrically connected to the electromagnet 5, the pressure sensor 203 is used to detect the pressure on the panel 202 in the corresponding area, and send the pressure signal to the controller, which then calculates the balancing mode of the balancing component according to the value and position of the pressure.

[0037] The position of each pressure sensor 203 should be input in advance to facilitate data processing by the controller. Simply put, when a user stands on a chassis unit 2 and the chassis unit 2 is not in the central area covered by the central counterweight block 3, the weight distribution of the car body 1 will be uneven and the balance will be reduced. The controller will control the corresponding electromagnet 5 to start. The electromagnet 5 corresponds to the central symmetrical area of ​​the chassis unit 2 in the standing area about the center point of the central counterweight block 3. The electromagnet 5 in this area is started to adsorb the corresponding balance unit 4 and move it to the bottom of the specified chassis unit 2, thereby balancing the user standing on the other side of this line, which is similar to the balancing action of a seesaw. Depending on the calculation method of the controller, the balancing accuracy and effect are also different. However, after moving the balance unit 4 to the corresponding area, in theory, the balance of the car body 1 can be improved to avoid excessive weight on one side of the car body 1 affecting the balanced operation of the elevator.

[0038] The following is an example of a balancing algorithm for the controller:

[0039] 1. Initialization:

[0040] Read the position information of each pressure sensor.

[0041] The initial balance state of the car is the central area covered by the central counterweight 3.

[0042] 2. Read pressure data:

[0043] Get the current pressure reading from each pressure sensor.

[0044] The chassis unit 2 on which the user is standing is identified (ie, the sensor with a pressure reading greater than a certain threshold).

[0045] 3. Calculate the unbalance:

[0046] For each chassis unit 2 on which a user stands, its unbalanced moment relative to the central counterweight 3 is calculated.

[0047] Sum up all the unbalanced moments to get the current total unbalance of the car.

[0048] 4. Determine the balance strategy:

[0049] According to the total unbalance, the number and position of the balancing units 4 that need to be moved are calculated.

[0050] The magnitude and direction of the adsorption force of each electromagnet 5 are determined to drive the balancing unit 4 to move to a specified position.

[0051] 5. Perform balancing actions:

[0052] A control signal is sent to the electromagnet 5 to start the adsorption or repulsion action.

[0053] The movement of the balancing units 4 is monitored to ensure that they reach the designated positions.

[0054] 6. Update the balance status:

[0055] According to the new position of the balancing unit 4, the balancing state of the car is updated.

[0056] If necessary, steps 2-5 are repeated until the car reaches equilibrium or a certain limit on the number of iterations is reached.

[0057] It is worth noting that a timer can be set to control the delayed start of the electromagnet 5, that is, the pressure sensor 203 continuously detects a continuous pressure signal to determine that the user is indeed standing in the area, and then the controller starts the pressure sensor 203 to initiate the balancing action, thereby reducing the energy consumption problem caused by frequent triggering of the balancing action by the instantaneous pressure signal detected when the user enters and exits the elevator or when the car body 1 moves frequently.

[0058] An extrusion groove is provided at the lower end of the core plate 204, and a matching pressure block 205 is slidably installed at the opening of the extrusion groove. An elastic liquid sac 207 is fixedly connected between the pressure block 205 and the top wall of the extrusion groove. The elastic liquid sac 207 is filled with a color-developing liquid. An annular color-developing cavity is provided inside the docking frame 201. The elastic liquid sac 207 is connected to the annular color-developing cavity through a plurality of evenly distributed infusion tubes 206. When the balancing unit 4 in the balancing assembly is driven by the electromagnet 5 and moves to the designated area, the pressure block 205 on the chassis unit 2 in the area will be squeezed, forcing it to push the color-developing liquid in the elastic liquid sac 207 through the infusion tube 206 into the annular color-developing cavity for color development, thereby prompting and guiding other users to stand in this area to balance the pressure. After balancing by the user's weight, the electromagnet 5 can be turned off to save energy.

[0059] The balancing unit 4 includes a balancing block 401, a slider 402, a magnet block 403 and an extrusion block 404. The slider 402 is fixedly connected to the lower end of the balancing block 401. A plurality of slide grooves matching the extrusion block 404 are provided at the bottom of the balancing cavity, and the slider 402 is slidably installed in the slide groove. The magnet block 403 is embedded and installed on the balancing block 401. The extrusion block 404 is fixedly connected to the upper end of the balancing block 401. The magnet block 403 can be moved by being attracted or repelled by the electromagnet 5. The slider 402 is used to limit the moving trajectory of the balancing block 401 so that it can accurately balance the weight. The extrusion block 404 is used to cooperate with the pressure block 205 to extrude it.

[0060] The ends of the extrusion block 404 and the pressure block 205 that are close to each other are both arc-surface structures, and a spring 6 is fixedly connected between the slider 402 and the side wall of the slide groove.

[0061] A pair of symmetrically distributed annular color-control sheets 7 are fixedly installed inside the annular color-developing cavity. The cross-sectional shape of the pair of annular color-control sheets 7 is trumpet-shaped, and the distance between them gradually decreases from top to bottom. The docking frame 201 is made of transparent material, such as high-strength glass, and the annular color-control sheets 7 are made of non-transparent material, such as opaque plastic. The pair of annular color-control sheets 7 with a trumpet-shaped structure can make the color-developing liquid present a gradually thickening "color-developing ring" as the liquid level rises after entering the cavity, and the prompt effect is more obvious. Even if part of the color-developing liquid enters the annular color-developing cavity due to the shaking of the elevator, the narrow space below the pair of annular color-control sheets 7 can block a certain field of vision, and it is not easy to have false prompts.

[0062] A plurality of evenly distributed reflective floats 8 are provided between a pair of annular color-control sheets 7, and an elastic pull rope 9 is fixedly connected between the reflective float 8 and the annular color-control sheet 7. Under normal conditions, the reflective float 8 is located at the lower opening of the pair of annular color-control sheets 7. When the color-developing liquid enters, it can rely on the buoyancy effect to rise with the liquid level, and cooperate with the original lights in the car body 1 to achieve a reflective effect, thereby further improving the prompting effect for users. When the elevator shakes, the reflective float 8 will shake synchronously at the liquid surface, and then cooperate with the lights to achieve a flashing effect, which can remind users that the elevator is shaking, and the greater the elevator shakes, the more obvious the flashing effect of the reflective float 8 is.

[0063] The reflective float 8 includes a core ball 801, a floating block 802 and a reflective film 803. The floating block 802 is fixedly connected to the upper end of the core ball 801 and together they constitute a spherical structure. The reflective film 803 is coated on the outer surface of the core ball 801. The reflective film 803 reflects the light and has a special flashing effect when combined with the color-developing liquid. The floating block 802 can ensure that the reflective float 8 as a whole can rise with the liquid level of the color-developing liquid, while the core ball 801 can stabilize the posture of the reflective float 8 to prevent it from moving due to very slight shaking under normal conditions, thereby causing the flashing effect to cause discomfort without prompting the user.

[0064] The diameter of the reflective float 8 is greater than the minimum distance between a pair of annular color control sheets 7 , and the float block 802 is made of a light buoyancy material with a density lower than that of the color developing liquid, such as a foam material.

[0065] The color-developing liquid is a colored translucent oil-like liquid, and the surfaces of the docking frame 201 and the annular color-control film 7 are coated with a nano-oleophobic coating. The colored translucent oil-like liquid not only has good light transmittance, but can also cooperate with the reflective film 803 to achieve a good reflective and flashing effect. At the same time, it has high fluidity and is not easy to adhere to the docking frame 201 and the annular color-control film 7 to cause residual color development.

[0066] Working principle:

[0067] In normal state, the car body 1 is in a balanced state with relatively even weight distribution. When a user enters the car body 1 and does not stand in the central area covered by the central counterweight block 3, please refer to Figure 8 When the user stands at a corner on one side, the weight of this area will increase, affecting the overall balance of the car body 1. At this time, the pressure sensor 203 on the chassis unit 2 in the corresponding area detects a continuous pressure signal and sends it to the controller, which then controls the electromagnet 5 to start adsorbing the corresponding balancing unit 4 and move it to the central symmetrical area of ​​the user's standing area, thereby balancing the user's weight to a certain extent about the center point, avoiding all the weight from being concentrated in one area, and improving the balance of the car body 1. Although the central counterweight block 3 area has some weight loss due to the movement of the balancing unit 4, since it is close to the central area of ​​the car body 1, the impact of the weight loss on the balance is much lower than that of the outer area.

[0068] Secondly, when the balancing unit 4 moves, the magnet block 403 will squeeze the pressure block 205 in the passing area when reaching the specified position, thereby forcing it to push the color-developing liquid in the elastic liquid capsule 207 into the docking frame 201 to form a color-developing ring. If it passes through multiple chassis units 2 on the way, the multiple chassis units 2 will be colored in turn until the last chassis unit 2 to arrive maintains the color-developing state, presenting a guiding path for the standing user, and the chassis unit 2 that finally maintains the color-developing state can prompt subsequent users to stand in that area to balance, so the electromagnet 5 can be closed to allow the balancing unit 4 to reset under the elastic force of the spring 6, thereby reducing the energy consumption of the electromagnet 5 that is always turned on.

[0069] In addition, when the car body 1 shakes, the reflective float 8 on the inside of the docking frame 201 will flash due to its reflective characteristics to prompt the user. The more obvious the flashing state is, the more violent the elevator shakes. It can prompt some shakes that are not strongly felt. The user can give feedback to the elevator maintenance personnel, so as to discover some hidden dangers in time. Even if the user stands in the center area, even if the color-developing liquid has not entered the corresponding chassis unit 2, the reflective float 8 itself has a certain flashing effect due to its reflective characteristics, but the prompt effect is worse than that of the color-developing liquid. When the car body 1 tilts, the level of the color-developing liquid entering the docking frame 201 changes relatively, and the "color-developing ring" in some areas becomes thinner or even disappears, and the "color-developing ring" in some other areas becomes thicker, indicating that the elevator is in a tilted state. The change in the level of the color-developing liquid and the horn-shaped structure design of a pair of annular color control plates 7 can be used to amplify the prompt of slight tilts. The greater the tilt, the more obvious the change of the "color-developing ring".

[0070] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and range of equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0071] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A self-balancing elevator car, characterized in that: include: A car body (1), wherein a balancing cavity is provided at the base of the car body (1); A balancing assembly is installed in the balancing cavity, the balancing assembly comprising a central counterweight (3) fixedly installed at the center of the balancing cavity, a plurality of balancing units (4) distributed in a circular array are slidably installed outside the central counterweight (3), and a plurality of electromagnets (5) corresponding to the balancing units (4) are fixedly installed on the side wall of the balancing cavity; The inner chassis is fixedly mounted above the inner base of the car body (1), and comprises a plurality of evenly distributed chassis units (2).

2. A self-balancing elevator car according to claim 1, characterized in that: The chassis unit (2) comprises a docking frame (201), the inner end of the docking frame (201) is fixedly connected to a core plate (204), the upper end of the core plate (204) is fixedly mounted with a panel (202), a pressure sensor (203) is mounted between the panel (202) and the core plate (204), the pressure sensor (203) is signal-connected to a controller, and the controller is electrically connected to the electromagnet (5).

3. A self-balancing elevator car according to claim 2, characterized in that: An extrusion groove is provided at the lower end of the core plate (204), a matching pressure block (205) is slidably mounted at the opening of the extrusion groove, an elastic liquid sac (207) is fixedly connected between the pressure block (205) and the top wall of the extrusion groove, the elastic liquid sac (207) is filled with a color-developing liquid, an annular color-developing cavity is provided inside the docking frame (201), and the elastic liquid sac (207) is connected to the annular color-developing cavity through a plurality of evenly distributed infusion tubes (206).

4. A self-balancing elevator car according to claim 3, characterized in that: The balancing unit (4) comprises a balancing block (401), a slider (402), a magnet block (403) and an extrusion block (404); the slider (402) is fixedly connected to the lower end of the balancing block (401); a plurality of slide grooves matching the extrusion block (404) are provided at the bottom of the balancing cavity, and the slider (402) is slidably installed in the slide grooves; the magnet block (403) is embedded and installed on the balancing block (401); and the extrusion block (404) is fixedly connected to the upper end of the balancing block (401).

5. A self-balancing elevator car according to claim 4, characterized in that: The ends of the extrusion block (404) and the pressure block (205) that are close to each other are both arc-surface structures, and a spring (6) is fixedly connected between the slider (402) and the side wall of the slide groove.

6. A self-balancing elevator car according to claim 4, characterized in that: A pair of symmetrically distributed annular color control sheets (7) are fixedly installed inside the annular color developing cavity, the cross-sectional shape of the pair of annular color control sheets (7) is trumpet-shaped, and the distance between them gradually decreases from top to bottom, the docking frame (201) is made of transparent material, and the annular color control sheets (7) are made of non-transparent material.

7. A self-balancing elevator car according to claim 6, characterized in that: A plurality of evenly distributed reflective floating balls (8) are arranged between a pair of the annular color control sheets (7), and an elastic drawstring (9) is fixedly connected between the reflective floating balls (8) and the annular color control sheets (7).

8. A self-balancing elevator car according to claim 7, characterized in that: The reflective floating ball (8) comprises a core ball (801), a floating block (802) and a reflective film (803), wherein the floating block (802) is fixedly connected to the upper end of the core ball (801) and together they form a spherical structure, and the reflective film (803) is coated on the outer surface of the core ball (801).

9. A self-balancing elevator car according to claim 8, characterized in that: The diameter of the reflective floating ball (8) is greater than the minimum distance between a pair of annular color control sheets (7), and the floating block (802) is made of a light buoyancy material.

10. A self-balancing elevator car according to claim 6, characterized in that: The color developing liquid is a colored light-transmitting oil-type liquid, and the surfaces of the docking frame (201) and the annular color control sheet (7) are coated with a nano-oleophobic coating.

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