Elevator weighing compensation method, device and elevator

Abstract

The present invention provides an elevator weighing compensation method, device and elevator, and relates to the technical field of lifting equipment. The method comprises: obtaining the current car load information from a load weighing device; calculating the weighing compensation weighting coefficient according to the wire rope parameters and the compensation chain parameters, wherein the wire rope parameters include the number of wire ropes and the unit weight of the wire ropes, and the compensation chain parameters include the number of compensation chains, the unit weight of the compensation chain and the elevator traction ratio; obtaining the elevator car position change; calculating the weighing compensation amount according to the weighing compensation weighting coefficient and the car position change; calculating the actual change of the elevator car load according to the simulated weighing amount and the weighing compensation amount; comparing the actual change with the rated load, and generating an overload alarm signal when it exceeds. The device comprises a load weighing device, a position detection device and a weighing compensation calculation unit. The present invention improves the weighing accuracy by calculating the influence of the weight change of the compensation wire rope and the compensation chain in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting equipment, and in particular to an elevator weighing compensation method, device and elevator. Background Art

[0002] In the field of elevator technology, weighing devices are an important component to ensure the safe operation of elevators. There are currently two mainstream elevator weighing solutions: one is to install the weighing device between the lower beam of the car frame and the car bottom. This solution is suitable for the case where there is elastic shock absorption between the car bottom and the car frame. It obtains the elevator load information by detecting the change in the distance between the magnet of the weighing switch and the sensor; the other is to install the weighing device at the rope end combination on the car side. This solution is suitable for the case where the car bottom and the car frame are rigidly connected. It obtains the elevator load information by detecting the change in the length of the spring at the rope end combination.

[0003] For freight elevators, the second weighing scheme is usually adopted because of its special requirements for the rigidity of the car bottom. However, this scheme has the technical problem of weighing error: in addition to the load of the car, the car rope assembly also carries the deadweight of the elevator wire rope below the rope assembly and the weight of the compensation chain on the car and counterweight side, and the deadweight of this section of wire rope and compensation chain will change with the position of the car in the hoistway. For example, when the car is at the bottom floor, the weight of the wire rope below the rope assembly will be more than the weight of the entire lifting height section of the wire rope when the car is at the top floor. This difference is particularly significant in heavy-load elevators using thicker wire ropes.

[0004] With the continuous increase in the design height of industrial plants, the application of large-load and large-lifting-height elevators is becoming more and more widespread. In this type of elevator, since the car bottom and the car frame are rigidly connected, a weighing scheme at the car rope end combination must be used. However, the weighing error caused by the deadweight of the wire rope and the compensation chain also increases accordingly, which may cause overload alarms at different floors of the fully loaded elevator in severe cases. For example, when the elevator is fully loaded at the top floor, the impact on the weighing is small due to the short wire rope at the rope end combination. However, when the fully loaded elevator travels to the bottom floor, the wire rope at the rope end combination is long, and its weight superimposed on the weight of the fully loaded elevator may exceed the weighing switch threshold, causing the elevator to stop.

[0005] Although the elevator compensation chain can compensate the weight of the traction wire rope to a certain extent, the difference between the total weight per unit length of the compensation chain and the total weight per unit length of the traction wire rope will change with the configuration of different wire ropes and compensation chains of the elevator, which may eventually lead to deviations between the actual load and the data obtained by the weighing device. When this deviation exceeds the threshold, it will not only cause elevator failure, but also affect the safety of elevator operation. Summary of the invention

[0006] The object of the present invention is to provide an elevator weighing compensation method, device and elevator, which solves the problem of weighing error caused by the change of the dead weight of the wire rope and the compensation chain when the rope end combination end is used for weighing in a large lifting height elevator by calculating the influence of the weight change of the wire rope and the compensation chain in real time and performing data compensation.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] An elevator weighing compensation method, comprising:

[0009] obtaining current car load information from a load weighing device arranged to weigh the current car load when the elevator car is standing at a landing floor in the elevator shaft;

[0010] Calculate the weighing compensation weighting coefficient according to the wire rope parameters and the compensation chain parameters, wherein the wire rope parameters include the number of wire ropes and the unit weight of the wire ropes, which are used to calculate the dead weight of the wire rope per unit length; the compensation chain parameters include the number of compensation chains, the unit weight of the compensation chain and the elevator traction ratio, which are used to calculate the dead weight of the compensation chain per unit length;

[0011] Get the change in the elevator car position;

[0012] Calculating a weighing compensation amount according to the weighing compensation weighting coefficient and the elevator car position change;

[0013] Calculating the actual change in the elevator car load based on the simulated weighing weight obtained by the load weighing device and the weighing compensation amount;

[0014] The actual change in the elevator car load is compared with a preset rated load, and when the actual change in the elevator car load exceeds the rated load, an overload alarm signal is generated.

[0015] Furthermore: the deadweight of the steel wire rope per unit length is calculated according to the following formula:

[0016] A 1 =n 1 ×q 1

[0017] in, A 1 is the weight of the wire rope per unit length, n 1 is the number of wire ropes, q 1 is the unit weight of the wire rope;

[0018] The deadweight of the compensation chain per unit length is calculated according to the following formula:

[0019] A 2 =n 2×

[0020] in, A 2 is the weight of the compensation chain per unit length, n 2 is the number of compensation chains, q 2 is the unit weight of the compensation chain, C is the elevator traction ratio.

[0021] Furthermore: the weighing compensation weighting coefficient is calculated according to the following formula:

[0022] B=A 1 -A 2

[0023] in, B is the weighing compensation weighting coefficient, A 1 is the weight of the wire rope per unit length, A 2 is the deadweight of the compensation chain per unit length.

[0024] Furthermore: the change in the elevator car position is represented by a change in the number of pulses obtained by a rotary encoder.

[0025] Furthermore: the weighing compensation amount is calculated according to the following formula:

[0026] K=Δ×E×B

[0027] in, K is the weighing compensation amount, D is the change in the number of pulses, B is the weighing compensation weighting coefficient, E is the elevator height difference corresponding to the unit pulse;

[0028] in E Calculated according to the following formula:

[0029] E=πD / (2048×C)

[0030] in, D is the traction sheave diameter, C is the elevator traction ratio.

[0031] Furthermore, the actual change in the elevator car load is calculated according to the following formula:

[0032] M=GK

[0033] in, M is the actual change in elevator car load, G To simulate weighing, K is the weighing compensation amount.

[0034] The present invention also provides an elevator weighing compensation device, which applies any of the above methods and comprises: a load weighing device, which is preferably arranged at the elevator car rope end assembly;

[0035] A position detection device, including a rotary encoder connected to the traction wheel;

[0036] A weighing compensation calculation unit is electrically connected to the load weighing device and the position detection device, and is used to: obtain the simulated weighing weight information of the load weighing device and the position change information of the position detection device; calculate the weighing compensation weighting coefficient according to preset wire rope parameters and compensation chain parameters; calculate the weighing compensation amount according to the weighing compensation weighting coefficient and the position change; calculate the actual change of the elevator car load according to the simulated weighing weight and the weighing compensation amount.

[0037] Further: the load weighing device comprises:

[0038] A load sensor, arranged at the rope head assembly, for detecting the spring deformation caused by the car load;

[0039] The signal conversion unit is electrically connected to the load sensor and is used to convert the spring deformation into an electrical signal.

[0040] The present invention also includes an elevator, comprising:

[0041] Elevator car;

[0042] A steel wire rope for suspending the elevator car;

[0043] A compensating chain, used to balance the weight of the steel wire rope;

[0044] Such as the elevator weighing compensation device mentioned above.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. The present invention solves the problem of weighing error caused by the weight change of the wire rope and the compensation chain when the rope end combination end is used to weigh the elevator with a large lifting height by calculating the influence of the weight change of the wire rope and the compensation chain in real time and performing data compensation. Specifically, by obtaining the change in the position of the elevator car, and combining the wire rope parameters and the compensation chain parameters to calculate the weighing compensation weighting coefficient, and then calculating the accurate weighing compensation amount, the actual change in the elevator car load is finally obtained, thereby avoiding the situation where the elevator falsely reports overload at different floors.

[0047] Second, the present invention quantifies the influence of the wire rope and the compensation chain into a specific mathematical model, uses an encoder to monitor the position change in real time, and dynamically calculates the compensation value, making the weighing result more accurate and reliable. This method only needs to set relevant parameters in the program to achieve weighing compensation, without increasing hardware costs, and has strong practicality.

[0048] 3. The present invention can be applied to elevator systems of various configurations. By introducing the traction ratio parameter into the calculation formula, the weighing compensation amount of the elevator system containing compensation chains of different specifications and different traction ratios can be accurately calculated, and it has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the structure of the elevator in the present invention;

[0050] Figure 2 It is a structural schematic diagram of an elevator weighing compensation device in the present invention;

[0051] Figure 3 A schematic diagram of a flow chart of an elevator weighing compensation method of the present invention;

[0052] In the figure:

[0053] 101. Car; 102. Counterweight; 103. Wire rope; 104. Compensation chain; 105. Traction wheel; 106. Rope end assembly; 201. Weighing compensation calculation unit; 202. Load weighing device; 203: Rotary encoder. DETAILED DESCRIPTION

[0054] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0056] like Figure 1As shown, a layout structure of a large lifting height elevator includes a car 101 arranged in the elevator shaft, a steel wire rope 103 for supporting the car 101, and a compensation chain 104 for balancing the weight of the steel wire rope 103. One end of the steel wire rope 103 is connected to the rope end assembly 106 of the car 101, and the other end is connected to the counterweight 102 after passing through a traction wheel 105 arranged in the machine room. One end of the compensation chain 104 is connected to the bottom of the car 101, and the other end is connected to the bottom of the counterweight 102, which is used to compensate for the weight imbalance caused by the difference in length of the steel wire rope 103 on the car 101 side and the counterweight 102 side when the car 101 is in different positions.

[0057] like Figure 2 As shown, in another embodiment, the elevator weighing compensation device of the present invention further includes a load weighing device 202 arranged at the rope end assembly 106 of the car 101, a rotary encoder 203 connected to the traction wheel 105, and a weighing compensation calculation unit 201 electrically connected to the load weighing device 202 and the rotary encoder 203. The load weighing device 202 includes a load sensor and a signal conversion unit, wherein the load sensor is used to detect the spring deformation caused by the load of the car 101, and the signal conversion unit converts the detected spring deformation into an electrical signal, that is, an analog weighing weight signal, and outputs it to the weighing compensation calculation unit 201.

[0058] Preferably, the load sensor can adopt a magnetic induction switch to obtain load information by detecting the change in the compressed length of the spring at the rope end assembly 106. When the load in the car 101 changes, the force acting on the rope end assembly 106 changes, causing the spring length to change accordingly, which in turn causes the distance between the magnet and the sensor to change, thereby obtaining load change information.

[0059] In another specific embodiment of the present invention, the present invention also includes an elevator weighing compensation method applied to the above elevator weighing compensation device, comprising the following steps:

[0060] S301: Obtaining the current load information of the car 101 from the load weighing device 202;

[0061] Therein, the load weighing device 202 is arranged to weigh the current load of the elevator car 101 preferably when the elevator car 101 is standing at a landing floor in the elevator shaft;

[0062] S302: Calculate the weighing compensation weighting coefficient according to the parameters of the wire rope 103 and the compensation chain 104.

[0063] The parameters of the steel wire rope 103 include the number of steel wire ropes 103 and the unit weight of the steel wire rope 103, which are used to calculate the self-weight of the steel wire rope 103 per unit length;

[0064] Specifically, the deadweight of the steel wire rope 103 per unit length is calculated according to the following formula:

[0065] A 1 =n 1 ×q 1

[0066] in, A 1 is the weight of the wire rope per unit length 103, n 1 is the number of wire ropes 103, q 1 is the unit weight of the wire rope 103;

[0067] The parameters of the compensation chain 104 include the number of compensation chains 104, the unit weight of the compensation chain 104 and the elevator traction ratio, which are used to calculate the deadweight of the compensation chain 104 per unit length;

[0068] Specifically, the deadweight of the compensation chain 104 per unit length is calculated according to the following formula:

[0069] A 2 =n 2×

[0070] in, A 2 is the weight of the compensation chain 104 per unit length, n 2 is the number of compensation chains 104, q 2 is the unit weight of the compensation chain 104, C is the elevator traction ratio.

[0071] The weighing compensation weighting coefficient is calculated according to the following formula:

[0072] B=A 1 -A 2

[0073] in, B is the weighing compensation weighting coefficient, A 1 is the weight of the wire rope per unit length 103, A 2 is the deadweight of the compensation chain 104 per unit length.

[0074] S303: Obtaining the position change of the elevator car 101;

[0075] The change in position of the elevator car 101 is represented by the change in the number of pulses obtained by the rotary encoder 203.

[0076] S304: Calculating a weighing compensation amount according to the weighing compensation weighting coefficient and the position change of the elevator car 101;

[0077] Specifically, the weighing compensation amount is calculated according to the following formula:

[0078] K=Δ×E×B

[0079] in, K is the weighing compensation amount, D is the change in the number of pulses, B is the weighing compensation weighting coefficient, E is the elevator height difference corresponding to the unit pulse;

[0080] in E Calculated according to the following formula:

[0081] E=πD / (2048×C)

[0082] in, D is the diameter of the traction sheave 105, C is the elevator traction ratio.

[0083] S305: Calculating the actual load change of the elevator car 101 according to the simulated weighing weight obtained by the load weighing device 202 and the weighing compensation amount;

[0084] The actual change in the load of the elevator car 101 is calculated according to the following formula:

[0085] M=GK

[0086] in, M is the actual change in the load of the elevator car 101, G To simulate weighing, K is the weighing compensation amount.

[0087] S306: Compare the actual load change of the elevator car 101 with the preset rated load, and generate an overload alarm signal when the actual load change of the elevator car 101 exceeds the rated load.

[0088] In another embodiment, a large lifting height elevator with a traction ratio of 4:1 is taken as an example to illustrate the specific implementation of the elevator weighing compensation method of the present invention.

[0089] First, the parameters of the steel wire rope 103 of the elevator are input into the weighing compensation calculation unit 201, including the number of steel wire ropes 103 n 1 and wire rope 103 unit weight q 1. Calculate the weight of the wire rope per unit length 103 A 1 =n 1 ×q 1. Input the compensation chain 104 parameters, including the number of compensation chains 104 n 2. Compensation chain 104 unit weight q 2 and the elevator traction ratio C=4, the weight of the compensation chain per unit length is calculated to be 104 A 2 =n2 ×q 2 / C ; Then calculate the weighing compensation weighting coefficient B=A 1 -A 2.

[0090] Secondly, the position change of the elevator car 101 is monitored by the rotary encoder 203. Specifically, according to the diameter of the traction sheave 105 D Calculate the circumference of the traction wheel 105 L=πD Since the rotary encoder 203 sends out 2048 pulses per rotation, the elevator height difference corresponding to the unit pulse can be obtained. E=πD / (2048×C) When the system detects the change in the number of pulses Δ, the weighing compensation amount can be calculated K=Δ×E×B .

[0091] Finally, combined with the simulated weighing weight output by the load weighing device 202 G , calculate the actual change in the load of the elevator car 101 M=GK The actual change M The influence of the weight change of the wire rope 103 and the compensation chain 104 has been eliminated, and the actual load change in the car 101 can be more accurately reflected. The weighing compensation calculation unit 201 compares the actual change with the preset rated load, and generates an overload alarm signal when the rated load is exceeded.

[0092] It should be noted that the above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and improvements to the present invention without departing from the concept and principle of the present invention, and these changes and improvements should fall within the protection scope of the present invention. For example, the load sensor may use other types of sensors as long as it can detect the change caused by the car load; the weighing compensation calculation unit may also use other methods to obtain the car position change information, not limited to the use of a rotary encoder, etc.

Claims

1. An elevator weighing compensation method, characterized in that: include: obtaining current car load information from a load weighing device arranged to weigh the current car load when the elevator car is standing at a landing floor in the elevator shaft; Calculate the weighing compensation weighting coefficient according to the wire rope parameters and the compensation chain parameters, wherein the wire rope parameters include the number of wire ropes and the unit weight of the wire ropes, which are used to calculate the dead weight of the wire rope per unit length; the compensation chain parameters include the number of compensation chains, the unit weight of the compensation chain and the elevator traction ratio, which are used to calculate the dead weight of the compensation chain per unit length; Get the change in the elevator car position; Calculating a weighing compensation amount according to the weighing compensation weighting coefficient and the elevator car position change; Calculating the actual change in the elevator car load based on the simulated weighing weight obtained by the load weighing device and the weighing compensation amount; Comparing the actual change in the elevator car load with a preset rated load, and generating an overload alarm signal when the actual change in the elevator car load exceeds the rated load; The deadweight of the steel wire rope per unit length is calculated according to the following formula: A 1 =n 1 ×q 1 in, A 1 is the weight of the wire rope per unit length, n 1 is the number of wire ropes, q 1 is the unit weight of the wire rope; The deadweight of the compensation chain per unit length is calculated according to the following formula: A 2 =n 2 × in, A 2 is the weight of the compensation chain per unit length, n 2 is the number of compensation chains, q 2 is the unit weight of the compensation chain, C is the elevator traction ratio; The weighing compensation weighting coefficient is calculated according to the following formula: B=A 1 -A 2 in, B is the weighing compensation weighting coefficient, A 1 is the weight of the wire rope per unit length, A 2 is the deadweight of the compensation chain per unit length.

2. An elevator weighing compensation method according to claim 1, characterized in that: The change in the elevator car position is represented by the change in the number of pulses obtained by the rotary encoder.

3. An elevator weighing compensation method according to claim 2, characterized in that: The weighing compensation amount is calculated according to the following formula: K = Δ × E × B in, K is the weighing compensation amount, Δ is the change in the number of pulses, B is the weighing compensation weighting coefficient, E is the elevator height difference corresponding to the unit pulse; in E Calculated according to the following formula: E = πD / (2048 × C) in, D is the traction sheave diameter, C is the elevator traction ratio.

4. The elevator weighing compensation method according to claim 1, characterized in that: The actual change in the elevator car load is calculated according to the following formula: M=GK in, M is the actual change in elevator car load, G To simulate weighing, K is the weighing compensation amount.

5. An elevator weighing compensation device, characterized in that: The method according to any one of claims 1 to 4, comprising: A load weighing device, which is preferably arranged at the elevator car rope end assembly; A position detection device, including a rotary encoder connected to the traction wheel; A weighing compensation calculation unit is electrically connected to the load weighing device and the position detection device, and is used to: obtain the simulated weighing weight information of the load weighing device and the position change information of the position detection device; calculate the weighing compensation weighting coefficient according to preset wire rope parameters and compensation chain parameters; calculate the weighing compensation amount according to the weighing compensation weighting coefficient and the position change; calculate the actual change of the elevator car load according to the simulated weighing weight and the weighing compensation amount.

6. An elevator weighing compensation device according to claim 5, characterized in that: The load weighing device comprises: A load sensor, arranged at the rope head assembly, for detecting the spring deformation caused by the car load; The signal conversion unit is electrically connected to the load sensor and is used to convert the spring deformation into an electrical signal.

7. An elevator, characterized in that: include: Elevator car; A steel wire rope for suspending the elevator car; Compensation chain, which compensates for the weight imbalance caused by the difference in wire rope length between the car side and the counterweight side when the car is in different positions; An elevator weighing compensation device as described in any one of claims 5 or 6.

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