An elevator load detection device and an elevator control method using the same

Abstract

The present invention discloses an elevator load detection device and an elevator control method using the same. The device includes an overload device, a termination device, a driving mechanism, a counterweight, and a car; the termination device includes a termination screw, an elastic member, and a socket plate and a resistive strain sensor sequentially arranged from bottom to top. The termination screw sequentially passes through the socket plate, the resistive strain sensor, and the elastic member. A nut is provided at the upper end of the termination screw, and the lower end of the termination screw is fixedly connected to the head end of the steel wire rope. The resistive strain sensor is electrically connected to the upper computer. The method includes an elevator operation step and an original data establishment step. The elevator load detection device and the elevator control method using the same solve the problems that it is difficult for installers or inspectors to accurately obtain the load of each elevator in a control group control or centralized elevator on site, and it is not convenient for installers or inspectors to operate, adjust, and verify relevant data of the elevator.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, and particularly relates to an elevator load detection device and an elevator control method using the same. Background Art

[0002] With the rapid improvement of the levels of artificial intelligence and information digitization technologies, elevators have gradually developed into a very convenient three-dimensional transportation device in people's lives and work.

[0003] For traction-driven elevators, among the safety hazards of many components, the overload problem directly affects the safety of the elevator. In the overload state, the elevator may experience operational failure, resulting in the elevator falling, seriously threatening the lives of passengers. Overload protection devices have various structural forms, all of which utilize the weighing principle, that is, the load weight of the elevator car is reflected to the overload control circuit through a weighing device. The weighing device can be set at the bottom of the car, on the top of the car, and in the machine room. When the load in the car exceeds the rated load weight, a warning signal can be issued, such as a beeping sound from an overweight buzzer or a display on the control panel of the operation box. However, basically all the output signals of various weighing devices of the elevator are switch quantities, making it difficult for installers or inspectors to accurately control the load of each elevator in a group control or centralized elevator on-site, and it is not convenient for installers or inspectors to adjust and verify the data of the elevator. Summary of the Invention

[0004] In order to overcome the defects existing in the prior art, an object of the present invention is to provide an elevator load detection device to solve the above problems.

[0005] In order to overcome the defects existing in the prior art, another object of the present invention is to provide an elevator control method to solve the above problems.

[0006] The technical solution adopted by the present invention to solve its technical problems is: an elevator load detection device, including a termination device, a driving mechanism, a counterweight, and a car provided in an elevator machine room or hoistway;

[0007] The overload device, the termination device, and the driving mechanism are all provided above the car; a fixed pulley is fixedly connected to the output shaft of the driving mechanism, a first movable pulley is connected to the upper side of the counterweight, a second movable pulley is connected to the upper side of the car, a steel wire rope sequentially bypasses the first movable pulley, the fixed pulley, and the second movable pulley, and both the head end and the tail end of the steel wire rope are connected to the termination device, and the termination device connected to the head end of the steel wire rope is provided with an overload device;

[0008] The terminal connection device includes a terminal connection screw, an elastic member, and a rope head plate and a resistive strain sensor arranged in sequence from bottom to top. The terminal connection screw sequentially passes through the rope head plate, the resistive strain sensor, and the elastic member. A nut is provided at the upper end of the terminal connection screw. The upper end of the elastic member abuts against the nut, and the lower end of the elastic member abuts against the resistive strain sensor. The lower end of the terminal connection screw is fixedly connected to the head or end of the steel wire rope. The resistive strain sensor is electrically connected to the upper computer.

[0009] It should be noted that the terminal connection device includes a plurality of terminal connection screws, elastic members, and resistive strain sensors, and the terminal connection screws, the elastic members, the resistive strain sensors, and the steel wire ropes correspond one by one;

[0010] A groove is provided on the upper surface of the rope head plate. A plurality of rows of sensor groups composed of resistive strain sensors are placed in the groove, and the resistive strain sensors in adjacent two rows of sensor groups are arranged staggeredly.

[0011] Optionally, the elevator load detection device further includes an upper computer, a controller, and a display. The input end of the upper computer is electrically connected to the resistive strain sensor. The output end of the upper computer is electrically connected to the controller and the display respectively. The controller is electrically connected to the driving mechanism.

[0012] Preferably, an elevator control method using the elevator load detection device includes:

[0013] Original data establishment step: Input the load weight into the car and conduct a full-course non-stop running test. Record the upward current value x when the car travels upward to a height of H / 2 and is at the same horizontal plane as the counterweight under different loads, and record the downward current value y when the car travels downward to a height of H / 2 and is at the same horizontal plane as the counterweight under different loads. Then obtain the functional relationship F(x, y) between the load rate and the current and store it in the original database; where H is the elevator hoisting height, the load rate = load / rated load, and the rated load = (counterweight weight - car self-weight) / elevator balance coefficient;

[0014] Elevator operation step: When the resistive strain sensor of the terminal connection device is stressed, the upper computer obtains the average value of the change amounts of all resistive strain sensors and then obtains the current load rate of the car. According to the functional relationship F(x, y) between the load rate and the current, obtain the upward current value x or the downward current value y corresponding to the current load rate of the car. The upper computer controls the car to travel upward or downward according to the upward current value x or the downward current value y.

[0015] Specifically, in the elevator operation step, when the load rate of the car is greater than or equal to 110%, the elevator door corresponding to the car stops closing and refuses to accept floor selection, the driving mechanism pauses to start, and at the same time, overloading is prompted.

[0016] When the load rate of the car is 90% to 100%, the car runs directly and the car does not respond to the hall call signal.

[0017] When the load rate of the car is 10% to 20% and there are registration instructions for all floors on the operation box in the car, cancel the registration instructions for all floors, and pause the start of the driving mechanism and wait for new registration instructions.

[0018] Optionally, it further includes the step of displaying and adjusting the rope socket tension:

[0019] When the resistance strain sensor of the termination device is stressed, the resistance strain sensor forms a voltage signal linearly related to its stress. The voltage signal is amplified by an amplifier and then sent to the upper computer for edge calculation after analog-to-digital conversion to obtain the current load, and then it is displayed through the display on the electric control cabinet, displaying the current load corresponding to each resistance strain sensor.

[0020] It should be noted that it further includes the step of abnormal prompt for the steel wire rope:

[0021] During the operation of the elevator, the upper computer receives the digital signal sent by the resistance strain sensor after amplification and analog-to-digital conversion, and calculates the current load. When the current load is less than the pre-set abnormal threshold, the number of the steel wire rope corresponding to the resistance strain sensor and the corresponding load are displayed through the multi-line display on the electric control cabinet.

[0022] Preferably, it further includes the step of early warning for the traction capacity of the steel wire rope:

[0023] Obtain the functional relationship F(x, y) between the load rate and the current in the original database, and obtain the upward current with a load rate of 0% and the downward current with a load rate of 125%.

[0024] When the car stops at the end station leveling while descending with a load factor of 125%, and the auxiliary encoder of the elevator speed limiter detects that the steel wire rope is in a slipping state, compare the current of the drive mechanism at this time with the descending current with a load factor of 125% in the original database. When the difference between the current of the drive mechanism and the descending current with a load factor of 125% in the original database is greater than the deviation threshold, a fault warning signal is formed; or when the car ascends empty to the end station leveling, and the auxiliary encoder of the elevator speed limiter detects that the steel wire rope is in a slipping state, compare the current of the drive mechanism at this time with the ascending current with a load factor of 0% in the original database. When the difference between the current of the drive mechanism and the ascending current with a load factor of 0% in the original database is less than the deviation threshold, a fault warning signal is formed.

[0025] Specifically, the original data establishment step further includes: when inputting load into the car and performing a full - journey non - stop operation test, obtaining the functional relationship F(x, y) between the load factor and the current corresponding to the load factor from 0% to 125% and storing it in the original database, and then generating a test record form including the elevator balance coefficient K, no - load point K0, interference point K1, non - stop point K2, overload point K3, and traction point K4.

[0026] Among them, the no - load point K0 is the ascending current when the load factor is 0%. The interference point K1 is the interval formed by the ascending current when the load factor is 10% - 20% or the interval formed by the descending current when the load factor is 10% - 20%. The balance point K is the ascending current when the load factor is 40% - 50% and the ascending current is equal to the descending current. The non - stop point K2 is the interval formed by the ascending current when the load factor is 90% - 100% or the interval formed by the descending current when the load factor is 90% - 100%. The overload point K3 is the ascending current or the descending current when the load factor is 110%. The traction point K4 is the descending current when the load factor is 125%.

[0027] The beneficial effect of the present invention is that when the steel wire rope pulls the end - connecting screw rod downward, the nut at the upper end of the end - connecting screw rod will press the upper end of the elastic member downward, so that the elastic member is compressed. The lower end of the elastic member will squeeze the resistance strain sensor, and the resistance strain sensor will generate a voltage signal linearly related to the force when deformed, which can further reflect the current load of the car. When each elevator in a group - controlled elevator is equipped with the end - connecting device, the current load of each elevator can be reflected through the voltage signal generated by the resistance strain sensor, which is convenient for installers or inspectors to adjust and verify the data of the elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of an elevator load detection device in an embodiment of the present invention;

[0029] Figure 2 Schematic structural diagram of the termination device in an embodiment of the present invention;

[0030] Figure 3 Schematic structural diagram of the termination device in another embodiment of the present invention;

[0031] Figure 4 Curve graph of the functional relationship F(x, y) between the load rate and the current in an embodiment of the present invention;

[0032] Figure 5 Correspondence table of current, load and functional points in an embodiment of the present invention;

[0033] Figure 6 Flow chart of the elevator control method in an embodiment of the present invention;

[0034] In the figure: 1 Overload device; 2 Termination device; 21 Termination screw; 23 Socket head plate; 24 Resistance strain sensor; 25 Elastic member; 26 Nut; 31 Fixed pulley; 32 First movable pulley; 33 Second movable pulley; 34 Steel wire rope; 4 Counterweight; 5 Car; 6 Host computer; 7 Controller. Specific embodiments

[0035] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] As Figure 1-6 shown, an elevator load detection device includes a termination device 2, a driving mechanism, a counterweight 4 and a car 5 provided in an elevator machine room or hoistway;

[0037] The overload device 1, the termination device 2 and the driving mechanism are all provided above the car 5; the output shaft of the driving mechanism is fixedly connected with a fixed pulley 31, the upper side of the counterweight 4 is connected with a first movable pulley 32, the upper side of the car 5 is connected with a second movable pulley 33, a steel wire rope 34 sequentially bypasses the first movable pulley 32, the fixed pulley 31 and the second movable pulley 33, and both the head end and the tail end of the steel wire rope 34 are connected with the termination device, and the termination device connected to the head end of the steel wire rope is provided with an overload device; in this embodiment, the overload device 1 is an existing structure, which is a safety device that can issue a warning signal and prevent the car 5 from running when the car 5 exceeds the rated load; the elastic member 25 is a spring;

[0038] The terminal device 2 includes a terminal screw 21, an elastic member 25, and a rope head plate 23 and a resistive strain sensor 24 arranged in sequence from bottom to top. The terminal screw 21 sequentially passes through standard parts such as the rope head plate 23, the resistive strain sensor 24, and the elastic member 25, such as Figure 2 As shown, a square head is provided at the upper end of the terminal screw 21 to prevent the terminal screw 21 from rotating when the elastic member is adjusted. The upper end of the elastic member 25 abuts against the nut 26, and the lower end of the elastic member 25 abuts against the resistive strain sensor 24. The outer diameter of the nut 26 is greater than the diameter of the cross-section of the elastic member 25. The lower end of the terminal screw 21 is fixedly connected to the head or end of the wire rope 34, and the resistive strain sensor 24 is electrically connected to the host computer 6.

[0039] In the elevator load detection device, when the wire rope 34 pulls the terminal screw 21 downward, the nut 26 at the upper end of the terminal screw 21 will press the upper end of the elastic member 25 downward, so that the elastic member 25 is compressed. The lower end of the elastic member 25 will squeeze the resistive strain sensor 24, and the resistive strain sensor 24 will generate a voltage signal linearly related to the force when deformed by the force, and then can reflect the current load of the car. When the terminal device 2 is installed in each elevator in a group control elevator, the current load of each elevator can be reflected by the voltage signal generated by the resistive strain sensor 24, so as to facilitate the installation personnel or inspection personnel to adjust and verify the data of the elevator.

[0040] It should be noted that, as Figure 3 As shown, the terminal device 2 includes a plurality of terminal screws 21, elastic members 25, and resistive strain sensors 24, and the terminal screws 21, the elastic members 25, the resistive strain sensors 24, and the wire ropes 34 all correspond one by one; a groove is provided on the upper surface of the rope head plate 23, and a plurality of rows of sensor groups composed of resistive strain sensors 24 are placed in the groove, and the resistive strain sensors 24 in adjacent two rows of sensor groups are arranged staggeredly. In this way, the force on each resistive strain sensor 24 can tend to be equal. Specifically, at least one end of the wire rope 34 is provided with an adjusting device, and the adjusting device is an existing structure, and the adjusting device is used to balance the tensions of the wire ropes 34 and balance the tensions of the wire ropes 34.

[0041] Optionally, the elevator load detection device further includes a host computer 6, a controller 7, and a display. The input end of the host computer 6 is electrically connected to the resistive strain sensor 24. The output end of the host computer 6 is electrically connected to the controller 7 and the display respectively. The controller 7 is electrically connected to the driving mechanism. The suspension ratio of the elevator in this embodiment (referring to the ratio of the total number of wire ropes 34 on the car 5 side to the number of wire ropes 34 on the traction sheave) is 2:1. As Figure 2 shown, when a single resistive strain sensor 24 is stressed, it outputs a voltage signal linearly related to the stress (the full scale is about 2MV). The output voltage signal is amplified by an amplifier and sent to the controller 7. After passing through an analog-to-digital converter (A / D), the analog signal is converted into a digital signal and sent to the host computer 6 for edge computing or logical processing. Then, the controller 7 transmits the digital quantity to the display in the electric control cabinet to display relevant comprehensive processing data. Then, according to this digital quantity, each termination device 2 is adjusted respectively. On the other hand, the digital quantity is transmitted to the operating system, and each function of the elevator operation is allocated by a microprocessor. To meet the requirements of the provisions in the national standard and achieve overload protection for the elevator. In addition, relevant data is also sent to the elevator car 5 to display the actual weight or overload weight in the car 5 and push the alarm bell to ring. In this embodiment, edge computing is a prior art, which refers to an open platform integrating network, computing, storage, and application core capabilities on the side close to the object or data source to provide the nearest-end service nearby.

[0042] As Figure 6 shown, specifically, an elevator control method using the above-mentioned elevator load detection device includes:

[0043] Step of establishing original data: Input load weight into the car 5 and conduct a straight-through operation test throughout the whole journey. Record the upward current value x when the car 5 travels upward to the height of H / 2 and is at the same horizontal plane as the counterweight 4 under different loads, and record the downward current value y when the car 5 travels downward to the height of H / 2 and is at the same horizontal plane as the counterweight 4 under different loads. Then obtain the functional relationship F(x, y) between the load rate and the current and store it in the original database; where H is the elevator lifting height, the load rate = load / rated load, and the rated load = (weight of the counterweight 4 - self-weight of the car 5) / elevator balance coefficient; specifically, a curve graph of the load rate and the current will also be drawn according to the functional relationship F(x, y) between the load rate and the current and stored in the original database; in this embodiment, using the detection method of the elevator balance coefficient, simulate the load and current during the detection process, according to Figure 4 and Figure 5 through 、 、 and Create charts in the original database for automatically generating data such as balance coefficient curves and K0 values on the remote detection terminal; and establish an original database for the corresponding points of current and load during start-up and operation, facilitating the optimal scheduling of passenger flow operation data in the group control operation of several elevators. Among them, F(x,y) is the functional relationship between load and current, F(Q) is the relational expression of load, G is the weight of the counterweight, W is the self-weight of the car 5, K is the balance point, K(x,y) is the functional relationship between the functional point and current, and S(x,y) is the functional relationship between the upward or downward moving distance and current. For example Figure 5 As shown, the corresponding functional points are: the no-load point K0 corresponds to the load F0, the interference point K1 corresponds to the loads F1 to F2, the balance point K corresponds to the loads F4 to F5, the non-stop point K2 corresponds to the loads F9 to F10, the overload point K3 corresponds to the load F11; the traction point K4 corresponds to the load F12; the load rate corresponding to the load F0 is 0%, the upward current is X0, and the downward current is Y0; the load rate corresponding to the load F1 is 10%, the upward current is X1, and the downward current is Y1; the load rate corresponding to the load F2 is 20%, the upward current is X2, and the downward current is Y2; the load rate corresponding to the load F4 is 40%, the upward current is X4, and the downward current is Y4; the load rate corresponding to the load F5 is 50%, the upward current is X5, and the downward current is Y5; the load rate corresponding to the load F9 is 90%, the upward current is X9, and the downward current is Y9; the load rate corresponding to the load F10 is 100%, the upward current is X10, and the downward current is Y10; the load rate corresponding to the load F11 is 110%, the upward current is X11, and the downward current is Y11; the load rate corresponding to the load F12 is 125%, the upward current is X12, and the downward current is Y12. According to 、 、 and Create charts, see details in Figure 4 and Figure 5 : During the whole-machine function test, the car 5 is respectively loaded with 0%, 10%, 20%, 30%, 40%, 50%, 60%, 80%, 90%, 100%, 110% and 125% of the rated load (i.e., the load rate) and run straight along the whole journey. Record the current values (x, y) when the car 5 moves upward and downward to the same horizontal plane as the counterweight 4 at H / 2 respectively. That is, measure the overcurrent of the drive mechanism and combine it with the speed measurement to make Figure 4 's current-load curve graph, and determine the balance point K and other corresponding functional points based on the intersection points and nodes of the upward and downward operation curves. And through experiments, store the charts according to 、 、 and and the functional points into the virtual host database to establish the original data.

[0044] Elevator operation steps: When the resistance strain sensor 24 of the termination device 2 is stressed, the host computer 6 obtains the mean value of the change amounts of all the resistance strain sensors 24 and then gets the current load rate of the car 5. According to the functional relationship F(x, y) between the load rate and the current, the upward current value x or the downward current value y corresponding to the current load rate of the car 5 is obtained. The host computer 6 controls the car 5 to move upward or downward according to the upward current value x or the downward current value y. The elevator weighs and loads the actual load, gives the corresponding starting current, and transmits the digital quantity of the starting current to the elevator control system. After the operating system compares the relevant data with the original database in the host computer 6, it outputs; on the other hand, the relevant data is input into the call allocation module in the data acquisition layer of the group control system to optimize the centralized operation and dispatching of several (3 or more) elevators. When the resistance strain sensor 24 is stressed by the load force, the output current quantity is sent to the controller 7 and passes through the analog-to-digital converter (A / D) to convert the analog signal into a digital signal, which is sent to the host computer 6 for edge calculation or logical processing. Then, its digital quantity is compared and processed with the corresponding starting current digital quantity in the original database. Then it is transmitted to the control systems of several elevators, and the operating system conducts centralized comparison and comprehensive processing of the whole machine digital quantity; and the relevant data processed is input into the call module in the data acquisition of the group control system, making the elevator control smooth, and the comfort of its operation reaches the best state. In addition, the present invention includes software programs such as the application of the above-mentioned various mechanisms, electronic components and digital sensors during the elevator operation process and functions. At the same time, its operating program uses technologies such as 5G (including land-based enhanced systems) communication to link the relevant data during the elevator operation into the cluster-type Internet of Things interactive operation and ecological monitoring management system.

[0045] It should be noted that in the elevator operation steps, when the load rate of the car 5 is greater than or equal to 110%, the elevator door corresponding to the car 5 stops closing and refuses to accept floor selection, the driving mechanism pauses to start, and at the same time, overloading is prompted; when the load reaches 110% of the rated load of the elevator, after being processed by the elevator control system, the elevator door cannot be closed and floor selection is not allowed; its power supply circuit is cut off, so that the elevator cannot start; at the same time, the operation panel of the car 5 displays overloading, and the alarm bell of the hall call box rings; when the load rate of the car 5 is 90% to 100%, the car 5 runs straight and the car 5 does not respond to the hall call signal; when the load rate of the car 5 is 10% to 20%, and all floors in the operation box in the car 5 have registration instructions, all the registration instructions on all floors are cancelled, and the driving mechanism is paused to start and waits for new registration instructions; in this way, it can be avoided that when there is only one person in the car, playing pranks and registering all floors, resulting in the elevator stopping at each floor.

[0046] Preferably, it further includes the step of displaying and adjusting the rope head tension:

[0047] When the resistive strain sensor 24 of the termination device 2 is stressed, the resistive strain sensor 24 forms a voltage signal linearly related to the stress. The voltage signal is amplified by an amplifier and then converted by an analog-to-digital converter and sent to the host computer 6 for edge computing to obtain the current load, and then displayed on the display of the electric control cabinet, displaying the current load corresponding to each resistive strain sensor 24.

[0048] In this way, the installer or inspector can adjust the compression distance of the elastic member 25 according to the current load displayed on the display, so that the deviation between the current load corresponding to each resistive strain sensor 24 and the load average value is not greater than 5%. When the resistive strain sensor 24 is under tension, the resistive strain sensor 24 outputs a voltage signal linearly related to the tension. The voltage signal output by the resistive strain sensor 24 is amplified by an amplifier and sent to the controller 7 through an analog-to-digital converter (A / D) to convert the analog signal into a digital signal, and then sent to the host computer 6 for edge computing or logical processing, and then its digital quantity is transmitted to the display of the electric control cabinet to display the relevant digital data of each resistive strain sensor 24, and on-site manual adjustment is made according to this data to make the average tension of each rope end meet the requirement of 5%.

[0049] Optionally, it further includes a steel wire rope abnormality prompt step:

[0050] During the operation of the elevator, the host computer 6 receives the digital signal after amplification and analog-to-digital conversion sent by the resistive strain sensor 24, and calculates the current load. When the current load is less than the preset abnormality threshold, it means that the stress on one resistive strain sensor 24 is greatly reduced compared to the stress on other resistive strain sensors 24. The number of the steel wire rope 34 corresponding to this resistive strain sensor 24 and the corresponding load are displayed on the multi-line display of the electric control cabinet; in addition, the number of the steel wire rope 34 corresponding to this resistive strain sensor 24 and the corresponding load are also sent to the remote monitoring terminal and the mobile phone to notify the inspector to go to the site for elevator maintenance. When a certain steel wire rope 34 breaks or elongates beyond the threshold, the digital quantity of the corresponding resistive strain sensor 24 is displayed on the display of the electric control cabinet and transmitted to the remote monitoring terminal or the mobile phone. During the operation of the elevator, when it is detected that the stress on the resistive strain sensor 24 corresponding to a certain steel wire rope 34 decreases, the output voltage signal is amplified by an amplifier and sent to the controller 7 through an analog-to-digital converter (A / D) to convert the analog signal into a digital signal, and then sent to the host computer 6 for edge computing. After comparison and processing with the original data, the digital quantity exceeding the abnormality threshold is transmitted to the display of the electric control cabinet for display and transmitted to the remote monitoring terminal or the mobile phone through the operating system of the controller 7.

[0051] Specifically, it further includes a traction capacity warning step for the steel wire rope 34:

[0052] Obtain the functional relationship F(x, y) between the load rate and the current in the original database, and obtain the upward current with a load rate of 0% and the downward current with a load rate of 125%. When the car 5 stops at the end station leveling with a load rate of 125% downward and the auxiliary encoder of the elevator speed limiter detects that the wire rope 34 is in a slipping state, compare the current of the driving mechanism at this time with the downward current with a load rate of 125% in the original database. When the difference between the current of the driving mechanism and the downward current with a load rate of 125% in the original database is greater than the deviation threshold, a fault warning signal is formed; or when the empty car 5 travels upward to the end station leveling and the auxiliary encoder of the elevator speed limiter detects that the wire rope 34 is in a slipping state, compare the current of the driving mechanism at this time with the upward current with a load rate of 0% in the original database. When the difference between the current of the driving mechanism and the upward current with a load rate of 0% in the original database is less than the deviation threshold, a fault warning signal is formed.

[0053] The load of the car 5 travels downward at 125% of the rated load (i.e., Figure 5 K4), and the empty car 5 travels upward (i.e., Figure 5 K0). When the load of the car 5 travels downward at 125% of the rated load or the empty car 5 travels upward, and when the car 5 runs to the lower end station or the upper end station leveling respectively, when the motor stops and is in a stationary state, the elevator should level accurately and there should be no slipping of the wire rope 34 on the traction sheave. Otherwise, the corresponding fault code is displayed on the display of the electric control cabinet, and the fault code is transmitted to the remote monitoring terminal or the mobile phone. Store the data when the load of the car 5 travels downward at 125% of the elevator rated load or the empty car 5 travels upward and stops at each end station leveling, and the relevant data without the slipping state of the wire rope 34 into the original database, as Figure 5 shown, that is, the data corresponding to point K0 and point K4. When the above two working conditions occur during the normal operation of the elevator and the slipping state of the elevator running wire rope 34 is detected by the auxiliary encoder of the speed limiter, the relevant data obtained by the overload device 1 is compared with the corresponding data in the original database. When the relevant data deviates from the standard value, the corresponding fault code is displayed on the display of the electric control cabinet, and the corresponding fault code is transmitted to the remote monitoring terminal or the mobile phone. In this embodiment, when the car 5 stops, that is, when the driving mechanism stops rotating, at this time, if the auxiliary encoder of the speed limiter has a moving signal, it means that the wire rope 34 slides on the fixed pulley 31, the first movable pulley 32 or the second movable pulley 33.

[0054] Specifically, the step of establishing the original data further includes: when inputting a load into the car for a full-course non-stop operation test, obtaining the functional relationship F(x, y) between the load rate and the current corresponding to a load rate of 0% to 125% and storing it in the original database, and then generating a test record form including the elevator balance coefficient K, no-load point K0, interference point K1, non-stop point K2, overload point K3, and traction point K4;

[0055] Among them, the no-load point K0 is the upward current at a load rate of 0%, the interference point K1 is the interval composed of the upward currents at a load rate of 10% - 20% or the interval composed of the downward currents at a load rate of 10% - 20%, the balance point K is the upward current when the load rate is 40% - 50% and the upward current is equal to the downward current, the non-stop point K2 is the interval composed of the upward currents at a load rate of 90% - 100% or the interval composed of the downward currents at a load rate of 90% - 100%, the overload point K3 is the upward current or the downward current at a load rate of 110%; the traction point K4 is the downward current at a load rate of 125%.

[0056] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. An elevator control method using an elevator load detection device, characterized in that: The device includes a termination device, a driving mechanism, a counterweight and a car, which are arranged in the elevator machine room or hoistway; The termination device and the driving mechanism are both arranged above the car; a fixed pulley is fixedly connected to the output shaft of the driving mechanism, a first movable pulley is connected to the upper side of the counterweight, a second movable pulley is connected to the upper side of the car, a steel wire rope sequentially bypasses the first movable pulley, the fixed pulley and the second movable pulley, and both the head end and the tail end of the steel wire rope are connected with the termination device, wherein the termination device connected to the head end of the steel wire rope is provided with an overload device; The termination device includes a termination screw, an elastic member, and a rope socket plate and a resistance strain sensor sequentially arranged from bottom to top. The termination screw sequentially passes through the rope socket plate, the resistance strain sensor and the elastic member. A nut is arranged at the upper end of the termination screw. The upper end of the elastic member abuts against the nut, the lower end of the elastic member abuts against the resistance strain sensor, the lower end of the termination screw is fixedly connected with the head end or the tail end of the steel wire rope, and the resistance strain sensor is electrically connected to the upper computer; Its method includes: Step of establishing original data: Input loads into the car and conduct a full-course non-stop operation test. Record the upward current value x when the car ascends to a height of H / 2 and is at the same horizontal plane as the counterweight under different loads, and record the downward current value y when the car descends to a height of H / 2 and is at the same horizontal plane as the counterweight under different loads. Then obtain the functional relationship F(x, y) between the load rate and the current and store it in the original database; where H is the elevator lifting height, load rate = load / rated load, and rated load = (counterweight weight - car self-weight) / elevator balance coefficient; Step of elevator operation: When the resistance strain sensor of the termination device is stressed, the upper computer obtains the average value of the change amounts of all resistance strain sensors to obtain the current load rate of the car. According to the functional relationship F(x, y) between the load rate and the current, obtain the upward current value x or the downward current value y corresponding to the current load rate of the car. The upper computer controls the car to ascend or descend according to the upward current value x or the downward current value y; Step of early warning for the traction capacity of the steel wire rope: Obtain the functional relationship F(x, y) between the load rate and the current in the original database to obtain the upward current when the load rate is 0% and the downward current when the load rate is 125%; When the car descends and stops at the terminal floor leveling at a load rate of 125%, and the auxiliary encoder of the elevator speed limiter detects that the steel wire rope is in a slipping state, compare the current of the driving mechanism at this time with the downward current when the load rate is 125% in the original database. When the difference between the current of the driving mechanism and the downward current when the load rate is 125% in the original database is greater than the deviation threshold, a fault warning signal is formed; or when the car ascends with no load and stops at the terminal floor leveling, and the auxiliary encoder of the elevator speed limiter detects that the steel wire rope is in a slipping state, compare the current of the driving mechanism at this time with the upward current when the load rate is 0% in the original database. When the difference between the current of the driving mechanism and the upward current when the load rate is 0% in the original database is less than the deviation threshold, a fault warning signal is formed.

2. The elevator control method using an elevator load detection device according to claim 1, characterized in that: The termination device includes a plurality of termination screws, elastic members, and resistance strain sensors, and the termination screws, the elastic members, the resistance strain sensors, and the wire ropes correspond one by one; The upper surface of the rope head plate is provided with a groove, and a plurality of rows of sensor groups composed of resistance strain sensors are placed in the groove, and the resistance strain sensors in adjacent two rows of sensor groups are arranged staggeredly.

3. The elevator control method using an elevator load detection device according to claim 1, characterized in that: The elevator load detection device further includes a host computer, a controller, and a display. The input end of the host computer is electrically connected to the resistance strain sensor, the output end of the host computer is electrically connected to the controller and the display respectively, and the controller is electrically connected to the drive mechanism.

4. The elevator control method using an elevator load detection device according to claim 1, characterized in that: In the elevator operation step, when the load rate of the car is greater than or equal to 110%, the elevator door corresponding to the car stops closing and refuses to accept floor selection, the drive mechanism pauses to start, and at the same time, overloading is prompted; When the load rate of the car is 90% to 100%, the car runs directly and the car does not respond to the hall call signal; When the load rate of the car is 10% to 20%, and there are registration instructions for all floors in the operation box in the car, cancel the registration instructions for all floors, and pause the start of the drive mechanism and wait for new registration instructions.

5. The elevator control method using an elevator load detection device according to claim 1, characterized in that, It further includes a rope head tension display and adjustment step: When the resistance strain sensor of the termination device is stressed, the resistance strain sensor forms a voltage signal linearly related to its stress. The voltage signal is amplified by an amplifier and then converted by analog-to-digital conversion and sent to the host computer for edge calculation to obtain the current load, and then it is displayed through the display on the electric control cabinet, and the current load corresponding to each resistance strain sensor is displayed.

6. A method for controlling an elevator using an elevator load detection device according to claim 5, characterized in that, It further includes a wire rope abnormality prompt step: During the operation of the elevator, the host computer receives the digital signal sent by the resistance strain sensor after amplification and analog-to-digital conversion, and calculates the current load. When the current load is less than the preset abnormality threshold, the number of the wire rope corresponding to the resistance strain sensor and the corresponding load are displayed through the multi-row display on the electric control cabinet.

7. An elevator control method using an elevator load detection device according to claim 1, characterized in that, The original data establishment step further includes: when inputting load into the car for a full-course direct running test, obtaining the functional relationship F(x, y) between the load rate and the current corresponding to the load rate of 0% to 125% and storing it in the original database, and then generating a test record form including the elevator balance coefficient K, no-load point K0, interference point K1, direct running point K2, overload point K3, and traction point K4; Among them, the no-load point K0 is the upward current when the load rate is 0%, the interference point K1 is the interval composed of the upward current when the load rate is 10% - 20% or the interval composed of the downward current when the load rate is 10% - 20%, the balance point K is the upward current when the load rate is 40% - 50% and the upward current is equal to the downward current, the direct running point K2 is the interval composed of the upward current when the load rate is 90% - 100% or the interval composed of the downward current when the load rate is 90% - 100%, the overload point K3 is the upward current or the downward current when the load rate is 110%; the traction point K4 is the downward current when the load rate is 125%.

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