Dynamic balance regulation and control device for elevator operation

Abstract

The invention relates to the field of elevators, and discloses an elevator operation dynamic balance regulation and control device which comprises an elevator shaft, an elevator machine room, an elevator car and a car frame for bearing the elevator car, the elevator machine room is located at the top of the elevator shaft, and a traction power system and a control cabinet for driving the elevator car and the car frame to ascend and descend are assembled in the elevator machine room; the load monitoring group is mounted at the bottom of the car; the counterweight adjusting structure is arranged at the top end of the lift car; the liquid adjustable balance weight structure is composed of a balance weight liquid containing box, a liquid containing tank and a liquid conveying hose, the balance weight liquid containing box is arranged at the top of the lift car through a balance weight adjusting structure, and the high-performance microprocessor is carried in a control cabinet and based on a PLC or an embedded system. According to the dynamic balance regulation and control device for elevator operation, the unstable phenomena such as shaking and inclination in the elevator operation process are effectively reduced through precise regulation and control, and the riding comfort is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of elevators, and in particular to a dynamic balance control device for elevator operation. Background Art

[0002] As an indispensable means of vertical transportation in modern high-rise buildings, the safety and stability of elevator operation are directly related to passenger safety and user experience. During elevator operation, uneven load distribution within the elevator car can cause a shift in the center of gravity, resulting in eccentric loading. This eccentric loading not only causes car sway and increased noise, but also places additional stress on components such as the traction system and guide rails, accelerating equipment wear. Therefore, precise control of the dynamic balance during elevator operation is a key technical requirement to ensure safe and efficient elevator operation and extend the service life of the equipment.

[0003] At present, traditional elevator balance control methods mainly rely on fixed counterweights or simple mechanical balancing devices. These methods perform a one-time counterweight setting during the elevator installation and commissioning phase, making it difficult to adapt to the dynamically changing load distribution in the car in real time. When passengers or cargo are unevenly distributed in the car, traditional devices are unable to adjust the balance in a timely manner, resulting in increased vibration and energy consumption during elevator operation. Long-term use can also cause problems such as wear of the traction wire rope and deformation of the guide rails, and may even cause safety accidents. In addition, although some elevators are equipped with simple load monitoring systems, they lack effective dynamic balance adjustment methods and cannot fundamentally solve the series of problems caused by unbalanced loading. It is difficult to meet the increasingly high requirements of modern elevators for operation quality and safety. For this reason, we have proposed a dynamic balance control device for elevator operation. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides an elevator operation dynamic balance control device to solve the above-mentioned problems.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: an elevator operation dynamic balance control device, comprising: An elevator shaft, an elevator machine room, a car, and a car frame carrying the car, wherein the elevator machine room is located at the top of the elevator shaft, and the elevator machine room is equipped with a traction power system and a control cabinet for driving the car and car frame to move up and down; The load monitoring group consists of multiple load sensors arranged in a matrix and installed at the bottom of the car; A counterweight adjustment structure is provided at the top of the car, and includes a Y-axis lateral movement component and an X-axis synchronous lateral movement component, which are arranged in a mutually perpendicular cross-type arrangement; The liquid adjustable counterweight structure consists of a counterweight liquid holding tank, a liquid storage tank, and a liquid infusion hose. The liquid storage tank is installed in the elevator machine room and contains counterweight liquid. There are two sets of liquid infusion hoses and they are connected between the liquid storage tank and the counterweight liquid holding tank. The counterweight liquid holding tank is installed on the top of the car through the counterweight adjustment structure and has any degree of freedom of displacement in the horizontal plane of the car top. The liquid adjustable counterweight structure and the counterweight adjustment structure constitute a dynamic counterweight adjustment mechanism; A dynamic balancing controller is mounted in a control cabinet and uses a high-performance microprocessor based on a PLC or embedded system. The dynamic balancing controller is electrically connected to the sensors in the load monitoring group, the liquid adjustable counterweight structure, and the electrical components in the counterweight adjustment structure.

[0006] Preferably, a transverse baffle is fixedly installed on the top of the car near the side, and a bent baffle is fixedly installed on the top of the side outer wall of the car opposite to the transverse baffle; The longitudinal section of the bent baffle is L-shaped, and the horizontal portion of the bottom end is flush with the top of the car, the vertical portion of the side is parallel and aligned with and spaced from the transverse baffle, and the top of the bent baffle is flush with the top of the transverse baffle.

[0007] Preferably, the Y-axis lateral movement assembly includes a lateral movement guide rail seat, a threaded screw rod, a limit cross bar and a servo motor; A threaded screw rod 1 is rotatably installed between the vertical portion of the horizontal baffle and the bending baffle, and a horizontal transverse guide rail seat is threadedly sleeved on the threaded screw rod 1; A limit cross bar is fixedly installed on one side of the threaded screw rod corresponding to the horizontal baffle and the bending baffle, and the limit cross bar is slidably sleeved with the transverse guide rail seat; A servo motor 1 is fixedly mounted on the bending baffle, and an output shaft of the servo motor 1 passes through a side wall of the bending baffle and is fixedly connected to a threaded screw rod 1.

[0008] Preferably, the transverse guide rail seat is parallel to the transverse baffle, and one end side of the transverse guide rail seat is aligned with the side wall of the car, and there is a transverse gap between the other end side and the other side wall of the car; The bottom end of the transverse guide rail seat is slidably fitted with the top end of the car, and the connection between the threaded screw rod 1 and the limiting cross bar and the transverse guide rail seat is close to the bottom end of the transverse guide rail seat.

[0009] Preferably, the X-axis synchronous traverse assembly includes a second threaded screw and a displacement seat; A transverse groove is provided on the top of the transverse guide rail seat, and a second threaded screw is rotatably installed in the transverse groove corresponding to the transverse guide rail seat, and the second threaded screw is vertically distributed with the first threaded screw; The lateral guide rail seat is slidably mounted with a displacement seat corresponding to the second threaded screw rod, and the displacement seat is threadedly sleeved with the second threaded screw rod; The top of the displacement seat protrudes from the top of the transverse guide rail seat and the two sides extend outwards. The extended areas on both sides of the corresponding top of the displacement seat are slidably fitted with the top of the transverse guide rail seat.

[0010] Preferably, the counterweight liquid holding tank is fixedly mounted on the top end of the displacement seat, and the centers of gravity of the car, the counterweight liquid holding tank and the displacement seat are all located on the vertical axis of the car.

[0011] Preferably, the X-axis synchronous displacement assembly further includes a transmission horizontal shaft, a second servo motor, a first helical gear, a second helical gear and a transmission structure; Two sets of vertical plates are fixedly mounted on the outer wall of the transverse guide rail seat corresponding to the end side that is not aligned with the car side wall, and the end side of the vertical plate facing away from the transverse guide rail seat is aligned with the car side wall; One end of the second threaded screw rod passes through the end side of the transverse guide rail seat and extends between the two sets of vertical plates, and a second helical gear is fixedly installed on the end of the second threaded screw rod located between the two sets of vertical plates; A transmission horizontal shaft is rotatably installed between the horizontal baffle and the bending baffle and passes through the two sets of vertical plates, and the transmission horizontal shaft is parallel to and spaced from the screw rod 1. A servo motor 2 is fixedly installed on one side of the bending baffle corresponding to the servo motor 1, and the output shaft of the servo motor 2 passes through the side wall of the bending baffle and is fixedly connected to the transmission horizontal shaft. The servo motor 1 and the servo motor 2 are both electrically connected to the dynamic balance controller; The helical gear 1 is connected to the transmission horizontal shaft through the transmission structure, and the helical gear 1 is located between the two sets of vertical plates and corresponds to the bottom of the helical gear 2. The helical gear 2 is vertically meshed with the helical gear 1.

[0012] Preferably, the transmission structure includes a rotating cylinder, a round groove, a transmission slot and a transmission protrusion strip; A rotating drum member located below the second helical gear is rotatably mounted between the two sets of vertical plates, and the first helical gear is fixedly sleeved on the rotating drum member, with both ends of the rotating drum member being flush with the side walls of the two sets of vertical plates facing away from each other. A through-type circular groove with two ends open is provided in the rotating cylinder, and the rotating cylinder is slidably sleeved on the transmission horizontal shaft through the circular groove; An integrated transmission protrusion strip is fixed on the top and bottom outer walls corresponding to the transmission horizontal axis, and a transmission card slot that fits and is connected to the transmission protrusion strip is opened on the top and bottom inner walls corresponding to the round groove of the rotating cylinder.

[0013] Preferably, the counterweight liquid contained in the liquid holding tank is a sodium polytungstate aqueous solution.

[0014] Preferably, the liquid storage tank is fixed with a metering pump electrically connected to the dynamic balance controller, and the output end of the metering pump is connected to two sets of liquid infusion hoses located in the elevator shaft; The car frame has a vertical through-tube groove at the bottom center corresponding to the top horizontal beam, and two symmetrical groups of bent through-tube grooves are opened at the top of the car frame corresponding to the bottom horizontal beam, and the two groups of bent through-tube grooves are L-shaped and connected to the vertical through-tube groove; The inner diameter of the bending conduit groove is the same as the outer diameter of the infusion hose, and the inner diameter of the vertical conduit groove is greater than twice the outer diameter of the infusion hose. The connection between the bending conduit groove and the vertical conduit groove and the sides of the bottom end of the opening of the vertical conduit groove are all designed with arc chamfers; The bottom ends of the two groups of infusion hoses are bent in sequence to pass through the bent through-pipe groove and the vertical through-pipe groove provided on the top of the car frame and then fixedly connected with the top end of the counterweight liquid-bearing box.

[0015] Preferably, the infusion hose is spiral-shaped as a whole and has the deformability of extending or contracting.

[0016] Compared with the prior art, the present invention provides an elevator operation dynamic balance control device, which has the following beneficial effects: Improve operational stability Precisely balanced car load: The load monitoring unit monitors pressure changes at the bottom of the car in real time. The dynamic balancing controller quickly calculates center-of-gravity deviations and controls the dynamic counterweight adjustment mechanism to adjust the position and weight of the counterweight tank, ensuring the car's center of gravity remains in the ideally balanced position. This precise control effectively reduces instabilities such as sway and tilt during elevator operation, significantly improving ride comfort. For example, in high-rise buildings, where elevators frequently start and stop, this device can adjust even if passengers or cargo are unevenly distributed within the car, ensuring smooth operation.

[0017] Reduced vibration and noise: Dynamic balancing reduces abnormal friction and collisions between the car and components such as guide rails and traction systems caused by unbalanced loading, thereby reducing vibration and noise during elevator operation. This not only improves the riding environment but also reduces noise interference to other areas within the building.

[0018] Enhanced security Preventing safety hazards caused by unbalanced loading: Severe unbalanced loading in traditional elevators can lead to uneven force distribution in the traction system, increasing safety risks such as wire rope breakage and car derailment. This device monitors and adjusts unbalanced loading in real time, effectively avoiding these safety hazards and ensuring the safety of passengers and cargo. For example, if cargo on one side of the car becomes overloaded, the device quickly activates and adjusts the position and weight of the counterweight tank to offset the unbalanced load, preventing the car from tilting out of control.

[0019] Improved system reliability: Dynamic balancing reduces wear on elevator components, extending the service life of key components such as the traction machine, wire rope, and guide rails. This reduces the probability of equipment failure and improves the reliability and safety of elevator operation. It also reduces the frequency of accidents such as elevator entrapment caused by component failure.

[0020] Improve energy saving effect Optimizing the force applied to the traction system: When the car is in a balanced state, the driving force required by the traction power system is reduced, thereby reducing energy consumption during elevator operation. Compared to traditional elevators, this device can effectively reduce electricity consumption, in line with the trend of energy conservation and emission reduction. For example, over long-term operation, it can significantly reduce the elevator's electricity bill.

[0021] Reduce ineffective energy consumption: Avoid extra energy consumption caused by eccentric loading, such as the energy required to overcome unbalanced torque. Through precise dynamic balancing control, elevator operation becomes more efficient, further improving energy efficiency.

[0022] Increase applicable scenarios and flexibility Adapts to diverse load distribution: Whether passengers are evenly distributed, standing in clusters, or cargo is irregularly stacked, the device can quickly respond and achieve dynamic balance control. This allows the elevator to adapt to a variety of complex usage scenarios and expands its application range.

[0023] Flexible Counterweight Adjustment: The counterweight adjustment mechanism and the liquid-adjustable counterweight structure work together to flexibly adjust the position and weight of the counterweight tank to suit varying eccentric loads. For example, for small eccentric loads, balance can be achieved simply by fine-tuning the position of the counterweight tank. For larger eccentric loads, both the position and weight can be adjusted simultaneously to ensure optimal balance.

[0024] Extend equipment life Reduced component wear: Dynamic balancing ensures even force distribution across elevator components, preventing localized excessive wear due to eccentric loading. For example, a balanced traction wire rope experiences more even force, slowing wear. Stable car operation also reduces wear between the guide rails and guide shoes, extending the replacement cycle and service life of these components.

[0025] Reduced maintenance costs: Extended component life means less frequent maintenance and replacement, reducing maintenance workload and costs. Furthermore, fewer equipment failures reduce indirect economic losses caused by downtime for repairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the dynamic counterweight adjustment mechanism of the present invention; Figure 3 This is a schematic diagram of the counterweight adjustment structure of the present invention; Figure 4 This is a schematic diagram of the decomposition of the transmission structure in the X-axis synchronous traverse assembly of the present invention; Figure 5 This is an exploded schematic diagram of the counterweight liquid-bearing box and the displacement seat of the present invention; Figure 6 This is a schematic cross-sectional view of the top of the car frame of the present invention; Figure 7 for Figure 6 A local enlarged schematic diagram of point A in FIG; Figure 8 This is a schematic diagram of the liquid adjustable weight structure of the present invention.

[0027] In the figure: 1. Elevator shaft; 2. Elevator machine room; 3. Car; 4. Car frame; 5. Control cabinet; 6. Counterweight liquid tank; 7. Liquid tank; 8. Infusion hose; 9. Horizontal baffle; 10. Bending baffle; 11. Transverse guide rail seat; 12. Threaded screw 1; 13. Limiting cross bar; 14. Servo motor 1; 15. Transverse groove; 16. Threaded screw 2; 17. Displacement seat; 18. Vertical plate; 19. Transmission horizontal shaft; 20. Servo motor 2; 21. Rotating drum; 22. Helical gear 1; 23. Helical gear 2; 24. Circular groove; 25. Transmission slot; 26. Transmission raised strip; 27. Bending pipe groove; 28. Vertical pipe groove. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1-8 , an elevator operation dynamic balance control device, comprising: An elevator shaft 1, an elevator machine room 2, a car 3, and a car frame 4 supporting the car 3. The elevator machine room 2 is located at the top of the elevator shaft 1. The elevator machine room 2 is equipped with a traction power system and a control cabinet 5 for driving the car 3 and the car frame 4 to move up and down. The load monitoring group consists of multiple load sensors arranged in a matrix and installed at the bottom of the car; The counterweight adjustment structure is arranged at the top of the car 3 and includes a Y-axis lateral movement component and an X-axis synchronous lateral movement component, which are arranged in a mutually perpendicular cross-type arrangement; The liquid adjustable counterweight structure consists of a counterweight liquid holding tank 6, a liquid storage tank 7, and a liquid infusion hose 8. The liquid storage tank 7 is installed in the elevator machine room 2 and contains counterweight liquid. There are two sets of liquid infusion hoses 8 and they are connected between the liquid storage tank 7 and the counterweight liquid holding tank 6. The counterweight liquid holding tank 6 is set on the top of the car 3 through the counterweight adjustment structure and has any degree of freedom of displacement in the horizontal plane of the top of the car 3. The liquid adjustable counterweight structure and the counterweight adjustment structure constitute a dynamic counterweight adjustment mechanism; The dynamic balance controller is mounted in the control cabinet 5 and adopts a high-performance microprocessor based on a PLC or embedded system. The dynamic balance controller is electrically connected to the sensors in the load monitoring group, the liquid adjustable counterweight structure and the electrical components in the counterweight adjustment structure.

[0030] Furthermore, a transverse baffle 9 is fixedly installed on the top of the car 3 near the side, and a bent baffle 10 is fixedly installed on the top of the side outer wall of the car 3 opposite to the transverse baffle 9; the longitudinal section of the bent baffle 10 is L-shaped, and the horizontal part of the bottom end is flush with the top of the car 3, the vertical part of the side is parallel and aligned with the transverse baffle 9 and separated, and the top of the bent baffle 10 is flush with the top of the transverse baffle 9, providing an installation foundation and structural support for the Y-axis transverse movement component and the X-axis synchronous transverse movement component in the counterweight adjustment structure.

[0031] Furthermore, the Y-axis transverse movement assembly includes a transverse guide rail seat 11, a threaded screw 12, a limiting cross bar 13 and a servo motor 14; a threaded screw 12 is rotatably installed between the vertical parts of the transverse baffle 9 and the bending baffle 10, and a horizontal transverse guide rail seat 11 is threadedly sleeved on the threaded screw 12; a limiting cross bar 13 is fixedly installed on one side of the transverse baffle 9 and the bending baffle 10 corresponding to the threaded screw 12, and the limiting cross bar 13 is slidably sleeved on the transverse guide rail seat 11; a servo motor 14 is fixedly installed on the bending baffle 10, and the output shaft of the servo motor 14 passes through the side wall of the bending baffle 10 and is fixedly connected to the threaded screw 12. When the servo motor 14 is started, its output shaft drives the threaded screw 12 to rotate. Since the transverse guide rail seat 11 is threadedly connected to the threaded screw 12, under the action of the threaded transmission, the transverse guide rail seat 11 moves axially along the threaded screw 12; at the same time, the limiting cross bar 13 is slidingly connected to the transverse guide rail seat 11, limiting the rotation of the transverse guide rail seat 11, so that it can only perform linear transverse movement along the Y-axis direction.

[0032] Furthermore, the transverse guide rail seat 11 is parallel to the transverse baffle 9, and one end side of the transverse guide rail seat 11 is aligned with the side wall of the car 3, and there is a transverse gap between the other end side and the other side wall of the car 3, which provides space for the installation and operation of the X-axis synchronous transverse movement component, while ensuring that it does not interfere with the side wall of the car when moving in the Y-axis direction; the bottom end of the transverse guide rail seat 11 slides in contact with the top end of the car 3, and the connection between the threaded screw 12 and the limiting cross bar 13 and the transverse guide rail seat 11 is close to the bottom end of the transverse guide rail seat 11, reserving space for opening the following transverse groove 15.

[0033] Furthermore, the X-axis synchronous transverse movement assembly includes a threaded screw 2 16 and a displacement seat 17; a transverse movement groove 15 is opened at the top of the transverse movement guide rail seat 11, and a threaded screw 2 16 is rotatably installed in the transverse movement groove 15 corresponding to the transverse movement guide rail seat 11, and the threaded screw 2 16 is vertically distributed with the threaded screw 1 12; a displacement seat 17 is slidably installed in the threaded screw 2 16 corresponding to the transverse movement guide rail seat 11, and the displacement seat 17 is threadedly sleeved with the threaded screw 2 16; the top of the displacement seat 17 protrudes from the top of the transverse movement guide rail seat 11 and extends outward on both sides, and the extended areas on both sides of the top corresponding to the displacement seat 17 slide in fit with the top of the transverse movement guide rail seat 11.

[0034] Furthermore, the counterweight liquid holding tank 6 is fixedly mounted on the top of the displacement seat 17 , and the centers of gravity of the car 3 , the counterweight liquid holding tank 6 , and the displacement seat 17 are all located on the vertical axis of the car 3 .

[0035] Furthermore, the X-axis synchronous displacement assembly also includes a transmission transverse shaft 19, a servo motor 20, a helical gear 1 22, a helical gear 2 23 and a transmission structure; two sets of vertical plates 18 are fixedly installed on the outer wall of the end side of the transverse guide rail seat 11 that is not aligned with the side wall of the car 3, and the vertical plates 18 are aligned with the side wall of the car 3 from the end side of the transverse guide rail seat 11; one end of the threaded screw 2 16 passes through the end side of the transverse guide rail seat 11 and extends between the two sets of vertical plates 18, and the threaded screw 2 16 is fixed on the end head between the two sets of vertical plates 18. A vertically penetrating plate is rotatably installed between the transverse baffle 9 and the bending baffle 10. The two groups of vertical plates 18 have a transmission horizontal axis 19, and the transmission horizontal axis 19 is parallel to and spaced from the screw rod 12. A servo motor 20 is fixedly installed on the side of the bending baffle 10 corresponding to the servo motor 14, and the output shaft of the servo motor 20 passes through the side wall of the bending baffle 10 and is fixedly connected to the transmission horizontal axis 19; the servo motor 14 and the servo motor 20 are both electrically connected to the dynamic balance controller; the helical gear 1 22 is connected to the transmission horizontal axis 19 through the transmission structure, and the helical gear 1 22 is located between the two groups of vertical plates 18 and corresponds to the bottom of the helical gear 2 23, and the helical gear 2 23 is vertically meshed with the helical gear 1 22 up and down.

[0036] Furthermore, the transmission structure includes a rotating drum member 21, a circular groove 24, a transmission card groove 25 and a transmission protrusion strip 26; a rotating drum member 21 located below the helical gear 23 is rotatably installed between the two groups of vertical plates 18, and the helical gear 1 22 is fixedly sleeved on the rotating drum member 21, and the two ends of the rotating drum member 21 are respectively flush with the side walls of the two groups of vertical plates 18 that are opposite to each other; a through-type circular groove 24 with openings at both ends is opened in the rotating drum member 21, and the rotating drum member 21 is slidably sleeved on the transmission horizontal shaft 19 through the circular groove 24; an integrated transmission protrusion strip 26 is fixedly provided on the corresponding top and bottom outer walls of the transmission horizontal shaft 19, and a transmission card groove 25 that fits and is clamped on the transmission protrusion strip 26 is opened on the top and bottom inner walls of the rotating drum member 21 corresponding to the circular groove 24; when the dynamic balancing controller detects that the car 3 has an overload in the X-axis direction, it sends a control instruction to the servo motor 2 20. Servo motor 20 is activated, and its output shaft drives the transmission shaft 19 to rotate. The transmission protrusion 26 on the transmission shaft 19 engages with the transmission slot 25 in the circular groove 24 within the rotating drum 21, driving the rotating drum 21 to rotate. Helical gear 1 22, fixedly mounted on the rotating drum 21, rotates accordingly. Helical gear 1 22 meshes perpendicularly with helical gear 2 23 fixed to the end of threaded screw 16, driving the latter. The displacement seat 17 is threadedly mounted on threaded screw 16. Driven by the screw, the displacement seat 17 performs linear transverse motion along the X-axis within the transverse groove 15 of the transverse guide rail seat 11. Through the transmission structure, the rotating drum 21 and helical gear 1 22 can move laterally in sync with helical gear 2 23 while also rotating with the transmission shaft 19. This ensures power transmission between the two, while ensuring transmission accuracy and allowing the rotating drum 21 a certain degree of sliding freedom on the transmission shaft 19.

[0037] Furthermore, the counterweight liquid contained in the liquid tank 7 is a sodium polytungstate aqueous solution. As a counterweight liquid, the sodium polytungstate aqueous solution has a large density and can provide a large weight change in a small volume, which is convenient for accurately adjusting the weight of the counterweight liquid tank 6, and then more accurately adjusting the unbalanced force caused by the overload of the car. It is non-toxic and odorless, and is harmless to the environment and human body.

[0038] Furthermore, a metering pump electrically connected to the dynamic balance controller is fixed on the liquid storage tank 7, and the output end of the metering pump is connected to two sets of liquid infusion hoses 8 located in the elevator shaft 1; a vertical through-tube groove 28 is opened at the bottom center of the car frame 4 corresponding to the top horizontal beam, and two symmetrical sets of bent through-tube grooves 27 are opened at the top of the car frame 4 corresponding to the bottom horizontal beam, and the two sets of bent through-tube grooves 27 are L-shaped and connected to the vertical through-tube groove 28; the inner diameter of the bent through-tube groove 27 is the same as the outer diameter of the liquid infusion hose 8, and the inner diameter of the vertical through-tube groove 28 is larger than twice the infusion hose 8 The outer diameter of the infusion hose 8 is 2.5mm, and the connection between the bending through-tube groove 27 and the vertical through-tube groove 28 and the bottom edge of the opening of the vertical through-tube groove 28 are all designed with arc chamfers; the bottom ends of the two sets of infusion hoses 8 are bent in sequence to pass through the bending through-tube groove 27 and the vertical through-tube groove 28 opened on the top of the car frame 4 and then fixedly connected to the top of the counterweight liquid holding tank 6; the infusion hose 8 is spiral in shape as a whole and has the deformability of extending or contracting; the metering pump accurately controls the delivery amount of the counterweight liquid, realizes the precise adjustment of the weight of the counterweight liquid holding tank 6, and cooperates with the counterweight adjustment structure to form a dynamic counterweight adjustment mechanism; The present invention is based on the dynamic balance control of liquid counterweight + moving mechanism Liquid balancing weight tank 6: stores liquid with adjustable weight, controls liquid injection / discharge through a metering pump or valve, and changes the balancing weight mass (M balancing weight).

[0039] Counterweight adjustment structure: The Y-axis lateral movement component and the X-axis synchronous lateral movement component are driven by a motor to move the liquid counterweight box 6 on the guide rail to change the position of the counterweight (equivalent to the center of mass offset L).

[0040] Dynamic balancing controller: uses sensors to monitor elevator load, speed, position and other data in real time, calculates the required counterweight mass and position, and drives the actuator (metering pump, servo motor) to adjust the balance.

[0041] It can offset the unbalanced torque between the elevator car (including load) and the counterweight in real time, reduce the load on the traction machine, reduce energy consumption and improve operation stability.

[0042] Unbalanced moment calculation: Assume that the total mass of the elevator car (including the load) is Mcar, the mass of the counterweight is Mcounterweight, and the distance between the suspension points of the car and the counterweight is D (i.e., the distance between the elevator guide rails), then the static unbalanced moment is: T static imbalance = (M car − M counterweight) * g * 2D When the elevator is running, the dynamic unbalanced torque caused by the inertial force must also be considered (such as M*a*h during acceleration / deceleration, where h is the center of mass height).

[0043] Counterweight adjustment principle: Through the combination of liquid counterweight (mass M counterweight) and counterweight adjustment structure (position L), a reverse torque is generated to offset the unbalanced torque: T counterweight = M counterweight * g * L + M moving counterweight * g * L′ Where L′ is the center of mass offset distance of the mobile counterweight, and the optimal combination of M counterweight and L (or L′) needs to be calculated in real time by the controller.

[0044] Calculation model of liquid counterweight mass Mweight 1. Derivation of basic formula (ignoring moving weight) The present invention uses liquid counterweight to adjust the balance (i.e. the counterweight adjustment structure is an auxiliary positioning or fixed structure), so the M counterweight must satisfy: M counterweight * g * L = | M car − M counterweight | * g * 2D Simplified: M counterweight = 2L | M car − M counterweight | * D Parameter Description: L: horizontal distance from the center of mass of the liquid counterweight box to the center of the elevator suspension).

[0045] D: The center distance between the car and the counterweight (usually equal to the distance between the elevator guide rails).

[0046] 2. Joint Adjustment Model with Moving Counterweight In the present invention, the liquid counterweight and the moving mechanism work together, so a two-variable optimization equation needs to be established: MCounterweight*L+MMovement*L′=2|MCar−MCounterweight|*D The controller solves the combination of M counterweight and L′ through the optimal control algorithm (such as PID, model predictive control MPC), and gives priority to using liquid counterweight (continuous adjustment) or mobile counterweight (fast response), depending on the dynamic characteristics of the elevator system.

[0047] The bent through-tube groove 27 and the vertical through-tube groove 28 on the car frame 4 provide a reasonable routing channel for the infusion hose 8 to avoid interference; the infusion hose 8 is spiral and deformable, ensuring that the counterweight liquid can be normally transported during the movement of the car and the position adjustment of the counterweight liquid tank 6 without affecting the normal operation of the system.

[0048] Working Principle: Whether the elevator is stationary or operating, the multiple load sensors in the load monitoring group are always in operation. When passengers or cargo enter car 3, their weight acts on the bottom of car 3, causing pressure changes at different locations on the bottom of car 3. These pressure changes are precisely sensed by the load sensors, which convert the pressure signals into electrical signals and transmit them in real time to the dynamic balance controller installed in the control cabinet 5. After receiving the pressure data from the load monitoring group, the dynamic balance controller uses its internal high-performance microprocessor, based on a PLC or embedded system, to rapidly analyze and process them. It calculates the current actual center of gravity position of car 3. Simultaneously, it compares this center of gravity position with a pre-set ideal equilibrium position to determine the deviation between the two, including the direction and degree of deviation, such as to the left, right, front, or rear of car 3. If the dynamic balance controller detects an unbalanced load in car 3, it responds quickly. Based on the direction and degree of the unbalanced load, it issues precise control instructions to the corresponding drive motors in the dynamic counterweight adjustment mechanism.

[0049] The dynamic balancing controller controls the operation of servo motors 14 and 20 in the counterweight adjustment mechanism, either simultaneously or separately, depending on the specific offset load conditions in the Y and X axes. For example, if the offset load detection results indicate that car 3 is overweight in the Y-axis direction, the dynamic balancing controller will activate servo motor 14, causing its output shaft to rotate screw rod 12. This causes the traverse guide rail base 11 to perform linear traverse motion along the Y-axis (the axial direction of screw rod 12), guided by the limit bar 13. Similarly, if an offset load is present in the X-axis direction, servo motor 20 will be activated, and its output shaft will rotate the transmission shaft 19. Transmission shaft 19, through transmission protrusions 26 and transmission slots 25, drives rotating drum 21. Helical gear 1 (22), fixedly mounted on rotating drum 21, rotates accordingly. Helical gear 1 (22) meshes vertically with helical gear 2 (23), fixedly mounted at the end of threaded screw 2 (16) between two sets of vertical plates 18, thereby driving threaded screw 2 (16). Driven by the screw principle, displacement seat 17 performs linear transverse motion along the X-axis (the axial direction of threaded screw 2 (16)) within transverse groove 15 of transverse guide rail seat 11. Counterweight liquid tank 6, fixedly mounted on top of displacement seat 17, moves along the X-axis to the appropriate position within the horizontal plane at the top of car 3. Simultaneously, the dynamic balancing controller calculates the required counterweight liquid weight difference based on the degree of eccentricity and issues a command to the metering pump on liquid tank 7. The metering pump accurately controls the delivery volume of the sodium polytungstate aqueous solution according to the instructions, and inputs or extracts the corresponding weight of the counterweight liquid into or out of the counterweight liquid tank 6 through the infusion hose 8, thereby changing the overall weight of the counterweight liquid tank 6.

[0050] After the position and weight of the counterweight tank 6 are adjusted, the balancing force it generates begins to act on the car 3. This balancing force acts in the opposite direction to the unbalanced force caused by the eccentric loading of the car 3, gradually offsetting it. As the unbalanced force decreases, the center of gravity of the car 3 gradually moves toward the ideal equilibrium position.

[0051] During the entire adjustment process, the load monitoring group continuously monitors the pressure changes at the bottom of the car 3 in real time, and continuously feeds back new data to the dynamic balance controller. The dynamic balance controller makes real-time corrections to the control instructions previously issued based on these feedback data. For example, if it is found that the counterweight liquid tank 6 moves too fast or too slow, resulting in excessive or insufficient adjustment of the center of gravity, the dynamic balance controller will promptly adjust the operating speed of the servo motor 14 and the servo motor 2 20, as well as the flow rate and time of the metering pump delivering the counterweight liquid. Through this continuous monitoring-feedback-adjustment mechanism, the moving distance and weight change of the counterweight liquid tank 6 are accurately controlled, and dynamic and precise regulation of the balance state of the car 3 is achieved, ensuring that the elevator remains stable throughout the entire operation process, avoiding problems such as unstable operation and increased component wear caused by unbalanced loading.

[0052] When the center of gravity of car 3 returns to near its ideal equilibrium position, the dynamic balance controller stops all components of the dynamic counterweight adjustment mechanism to maintain the current equilibrium state. However, the load monitoring unit continues to monitor the pressure at the bottom of car 3 in real time. If unbalanced loading is detected again, the entire process described above will be repeated to promptly adjust the balance of car 3 and ensure the stability and safety of elevator operation.

[0053] In actual application: Load sensor: Germany's HBM's 1-SPL / 300G-1 single-point load cell is commonly used in the weighing field. For elevator load measurement, there are various types, such as car floor pressure sensors and CLCZ-P1 weighing switches. Suzhou Hengda's HD-MV01A and FUYIDE's FYD-CZ02A are commonly used sensor models in elevator load detection. In addition, the CXD-800kg elevator load measurement sensor is suitable for weighing some mechanical equipment.

[0054] Dynamic balancing controllers: TA brand, for example, offer dynamic balancing electric control valves with both balancing and control functions. Models like the TBV-C (DN15-DN25) are suitable for FCU terminal equipment, integrating static balancing and on / off control. The COMPACT-P (DN10-DN32) is commonly used in FCUs, AHUs / MAUs, and other terminals, enabling both differential pressure control and on / off / regulating control. The TA-Modulator (DN15-150) is used in large terminal equipment like AHUs / MAUs and FCU branches, providing both differential pressure control and regulating control.

[0055] High-performance microprocessors based on PLCs or embedded systems: In the field of industrial automation, Siemens' S7-1200 series PLC is a commonly used high-performance microprocessor based on PLCs. It has a rich instruction set, high computing speed, and powerful communication capabilities, and can well meet the needs of various industrial control scenarios. In terms of embedded systems, Renesas Electronics' RZ / T2M microprocessor is designed for industrial automation, with real-time processing capabilities and rich interface resources, suitable for applications with high requirements for system performance and reliability.

[0056] Metering pumps: Milton Roy's ProMinent electromagnetic diaphragm metering pumps are widely used in the chemical, water treatment and other industries. This series of metering pumps has high-precision and stable flow control capabilities; Pulsfeeder's ULTRA series mechanical diaphragm metering pumps are also commonly used models that can achieve accurate fluid transportation and metering.

[0057] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An elevator operation dynamic balance control device, characterized in that: include: An elevator shaft (1), an elevator machine room (2), a car (3), and a car frame (4) carrying the car (3), wherein the elevator machine room (2) is located at the top of the elevator shaft (1), and a traction power system and a control cabinet (5) for driving the car (3) and the car frame (4) to move up and down are assembled in the elevator machine room (2); The load monitoring group consists of multiple load sensors arranged in a matrix and installed at the bottom of the car; A counterweight adjustment structure is provided at the top of the car (3), the counterweight adjustment structure comprising a Y-axis transverse movement component and an X-axis synchronous transverse movement component, and the components are arranged in a mutually perpendicular cross-distribution manner; A liquid adjustable counterweight structure is composed of a counterweight liquid holding tank (6), a liquid storage tank (7) and a liquid infusion hose (8), wherein the liquid storage tank (7) is installed in the elevator room (2) and contains counterweight liquid, and the liquid infusion hose (8) has two groups and is connected between the liquid storage tank (7) and the counterweight liquid holding tank (6), and the counterweight liquid holding tank (6) is arranged on the top of the car (3) through the counterweight adjustment structure, and the counterweight liquid holding tank (6) has any displacement freedom in the horizontal plane of the top of the car (3); The liquid adjustable counterweight structure and the counterweight adjustment structure constitute a dynamic counterweight adjustment mechanism; A dynamic balance controller is mounted in a control cabinet (5) and uses a high-performance microprocessor based on a PLC or embedded system. The dynamic balance controller is electrically connected to the sensors in the load monitoring group, the liquid adjustable counterweight structure, and the electrical components in the counterweight adjustment structure.

2. The elevator operation dynamic balance control device according to claim 1, characterized in that: A transverse baffle (9) is fixedly installed at the top of the car (3) near the side, and a bent baffle (10) is fixedly installed at the top of the side outer wall of the car (3) on the side opposite to the transverse baffle (9); The longitudinal section of the bent baffle (10) is L-shaped, and the horizontal portion of the bottom end is flush with the top end of the car (3), the vertical portion of the side is parallel and aligned with the transverse baffle (9) and spaced apart, and the top end of the bent baffle (10) is flush with the top end of the transverse baffle (9).

3. The elevator operation dynamic balance control device according to claim 2, characterized in that: The Y-axis transverse movement assembly includes a transverse movement guide rail seat (11), a threaded screw rod (12), a limit cross bar (13) and a servo motor (14); A threaded screw rod (12) is rotatably mounted between the vertical portions of the horizontal baffle (9) and the bending baffle (10), and a horizontal transverse guide rail seat (11) is threadedly sleeved on the threaded screw rod (12); A limiting cross bar (13) is fixedly installed on one side of the threaded screw rod (12) between the transverse baffle (9) and the bending baffle (10), and the limiting cross bar (13) is slidably sleeved with the transverse guide rail seat (11); A servo motor 1 (14) is fixedly mounted on the bending baffle (10), and an output shaft of the servo motor 1 (14) passes through the side wall of the bending baffle (10) and is fixedly connected to the threaded screw 1 (12).

4. The elevator operation dynamic balance control device according to claim 3, characterized in that: The transverse guide rail seat (11) is parallel to the transverse baffle (9), and one end side of the transverse guide rail seat (11) is aligned vertically with the side wall of the car (3), and a transverse gap exists between the other end side and the other side wall of the car (3); The bottom end of the transverse guide rail seat (11) is slidably fitted with the top end of the car (3), and the connection between the threaded screw rod 1 (12) and the limiting cross bar (13) and the transverse guide rail seat (11) is close to the bottom end of the transverse guide rail seat (11).

5. The elevator operation dynamic balance control device according to claim 4, characterized in that: The X-axis synchronous transverse movement assembly includes a second threaded screw (16) and a displacement seat (17); A transverse groove (15) is provided at the top of the transverse guide rail seat (11), and a second threaded screw rod (16) is rotatably installed in the transverse groove (15) corresponding to the transverse guide rail seat (11), and the second threaded screw rod (16) is vertically distributed with the first threaded screw rod (12); The transverse guide rail seat (11) is slidably mounted with a displacement seat (17) corresponding to the second threaded screw rod (16), and the displacement seat (17) is threadedly sleeved with the second threaded screw rod (16); The top of the displacement seat (17) protrudes from the top of the transverse guide rail seat (11) and the two sides extend outwards, and the extended areas on both sides of the corresponding top of the displacement seat (17) are slidably fitted with the top of the transverse guide rail seat (11).

6. The elevator operation dynamic balance control device according to claim 5, characterized in that: The counterweight liquid-bearing tank (6) is fixedly mounted on the top of the displacement seat (17), and the centers of gravity of the car (3), the counterweight liquid-bearing tank (6), and the displacement seat (17) are all located on the vertical axis of the car (3).

7. The elevator operation dynamic balance control device according to claim 6, characterized in that: The X-axis synchronous displacement assembly further includes a transmission transverse shaft (19), a second servo motor (20), a first helical gear (22), a second helical gear (23) and a transmission structure; Two sets of vertical plates (18) are fixedly mounted on the outer wall of the transverse guide rail seat (11) that is not aligned with the side wall of the car (3) in the vertical direction, and the end side of the vertical plates (18) facing away from the transverse guide rail seat (11) is aligned with the side wall of the car (3) in the vertical direction; One end of the second threaded screw rod (16) passes through the end side of the transverse guide rail seat (11) and extends between the two sets of vertical plates (18), and a second helical gear (23) is fixedly installed on the end of the second threaded screw rod (16) located between the two sets of vertical plates (18); A transmission horizontal shaft (19) is rotatably installed between the horizontal baffle (9) and the bending baffle (10) and vertically penetrates the two sets of vertical plates (18), and the transmission horizontal shaft (19) is parallel to and spaced from the screw rod 1 (12). A servo motor 2 (20) is fixedly installed on one side of the bending baffle (10) corresponding to the servo motor 1 (14), and the output shaft of the servo motor 2 (20) penetrates the side wall of the bending baffle (10) and is fixedly connected to the transmission horizontal shaft (19); The servo motor 1 (14) and the servo motor 2 (20) are both electrically connected to the dynamic balance controller; The helical gear 1 (22) is connected to the transmission horizontal shaft (19) through a transmission structure, and the helical gear 1 (22) is located between the two sets of vertical plates (18) and corresponds to the bottom of the helical gear 2 (23). The helical gear 2 (23) is vertically meshed with the helical gear 1 (22) in an upper and lower direction.

8. The elevator operation dynamic balance control device according to claim 7, characterized in that: The transmission structure comprises a rotating cylinder (21), a round groove (24), a transmission slot (25) and a transmission protrusion strip (26); A rotating cylinder (21) located below the second helical gear (23) is rotatably mounted between the two sets of vertical plates (18), and the first helical gear (22) is fixedly sleeved on the rotating cylinder (21), with both ends of the rotating cylinder (21) being flush with the side walls of the two sets of vertical plates (18) facing away from each other. A through-type circular groove (24) with openings at both ends is provided in the rotating cylinder (21), and the rotating cylinder (21) is slidably sleeved on the transmission horizontal shaft (19) through the circular groove (24); An integrated transmission protrusion strip (26) is fixedly provided on the top and bottom outer walls corresponding to the transmission transverse shaft (19), and a transmission clamping groove (25) is provided on the top and bottom inner walls corresponding to the round groove (24) of the rotating cylinder (21) and is fitted and clamped on the transmission protrusion strip (26).

9. The elevator operation dynamic balance control device according to claim 6, characterized in that: The counterweight liquid contained in the liquid holding tank (7) is a sodium polytungstate aqueous solution.

10. The elevator operation dynamic balance control device according to claim 9, characterized in that: The liquid storage tank (7) is fixedly provided with a metering pump electrically connected to the dynamic balance controller, and the output end of the metering pump is connected to two groups of liquid infusion hoses (8) located in the elevator shaft (1); The car frame (4) is provided with a vertical through-tube groove (28) at the bottom center corresponding to the top horizontal beam, and the car frame (4) is provided with two symmetrical groups of bent through-tube grooves (27) at the top end corresponding to the bottom horizontal beam, and the two groups of bent through-tube grooves (27) are L-shaped and communicate with the vertical through-tube groove (28); The inner diameter of the bending through-tube groove (27) is the same as the outer diameter of the infusion hose (8), the inner diameter of the vertical through-tube groove (28) is greater than twice the outer diameter of the infusion hose (8), and the connection between the bending through-tube groove (27) and the vertical through-tube groove (28) and the side of the bottom end of the opening of the vertical through-tube groove (28) are all designed with arc chamfers; The bottom ends of the two groups of infusion hoses (8) are bent in sequence and passed through the bent pipe groove (27) and the vertical pipe groove (28) opened on the top of the car frame (4) and then fixedly connected to the top of the counterweight liquid tank (6); The infusion hose (8) is spiral in shape as a whole and has the deformability of extending or contracting.

Images