Elevator load test method

Abstract

The present invention provides a load test method for an elevator that can obtain a load test graph without using a test weight. [Solution] The load test method for an elevator (10) of the present invention involves connecting a car (20) and a counterweight (30) with a rope (40), winding up the rope with a motor (50), driving the motor at a rated voltage and rated frequency, and performing ascending and descending operations to measure the motor current value relative to the load, and creating a load test graph from the measured load and motor current value, including the balance point where the car and counterweight are in equilibrium.The motor is driven in the ascending direction at the rated voltage and rated frequency with no maintenance worker (60) on the car and with the maintenance worker on the car, and the load test graph is created from the obtained motor current value.

Description

[Technical Field]

[0001] The present invention relates to load testing of elevators, and more particularly to a method by which load testing can be performed without the use of test weights. [Background technology]

[0002] When an elevator is installed, a construction completion inspection test is conducted as specified by the Japan Elevator Association. The construction completion inspection test includes a load test, and the results of the load test, such as load test graphs, are recorded in a construction completion inspection test report and submitted to government agencies.

[0003] The load test, specified in JIS A4302:2006, determines whether the weight balance between the car and counterweight is appropriate. In the load test, a test weight equal to 110% of the car's rated load is brought in, and a maintenance technician (tester) loads test weights equal to 0%, 25%, 50% (or 45%), 75%, 100%, and 110% of the rated load onto the car. The motor is rotated at the rated voltage and rated frequency, and the car is driven. The motor current is measured at the midpoint of the entire lift distance, i.e., the point where the car and counterweight pass each other. The load and motor current are then measured during both ascending and descending operations. The measurement points are plotted on a coordinate system with the load on the horizontal axis and the motor current on the vertical axis, and a load test graph is created by connecting these measurement points with an approximate curve.

[0004] Based on the load test graph, the counterweight is adjusted to obtain the load test graph that will ultimately be submitted to government agencies.The balance point at which powering and regenerative operation switch over is also derived. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 1-321278 [Patent Document 2] Japanese Patent Application Publication No. 7-285751 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] As described above, the load test is performed by transferring a test weight corresponding to the rated load onto the car each time, and a load test graph is obtained with the motor current value on the vertical axis and the load on the horizontal axis. For example, if the rated load of the car is 1000 kg, a load of 0% to 110% is applied during the load test. Therefore, in this case, it is necessary to prepare a test weight of at least 1100 kg. The load test is then performed by transferring the test weight so that the load is 0%, 25%, 45%, or 50%, 75%, 100%, or 110%. Then, as described above, the load test graph is obtained by connecting the measurement points with an approximate curve.

[0007] In this way, the reason why each setting and adjustment cannot be made during initial setup or maintenance without applying an actual load is because of uncertainties involved, such as mechanical loss, electrical loss, and displacement of mechanical parts.

[0008] However, because the load test graph is an approximate curve, the load and motor current values ​​will differ from the values ​​on the graph, especially around 50% of the rated load. Also, if the load test is normal, the load test graph will be symmetrical on both the rising and falling sides, but even in normal cases the approximate curve will be distorted.

[0009] Therefore, in Patent Application No. 2023-214451, the applicant has made it possible to easily derive the balance point by adopting a load test graph in which the measurement points obtained by the load test using the above-mentioned test weight are connected by straight lines on the ascending and descending sides, without approximating the load test graph.

[0010] However, even with the applicant's method, it is still necessary to prepare a test weight corresponding to the rated load each time a load test is conducted, and to transfer the weight and perform measurements.

[0011] An object of the present invention is to provide a load test method for an elevator that can obtain a load test graph without using a test weight. [Means for solving the problem]

[0012] The load test method for an elevator of the present invention comprises: An elevator load test method includes: connecting a car and a counterweight with a rope, and winding up the rope with a motor; driving the motor at a rated voltage and a rated frequency; performing ascending and descending operations; measuring motor current values ​​relative to loads; and creating a load test graph including a balance point where the car and the counterweight are in equilibrium with each other from the measured load and motor current values; The motor is driven in an ascending direction at the rated voltage and the rated frequency with no maintenance personnel on the car and with the maintenance personnel on the car, and the load test graph is created from the obtained motor current values.

[0013] The motor current is a no-maintenance-person ascending motor current value obtained by driving the motor in an ascending direction at the rated voltage and the rated frequency without a maintenance person on the car and measuring the motor current; an ascending motor current value with a maintenance worker present, the motor being driven in an ascending direction at the rated voltage and the rated frequency with the maintenance worker on the car, and the motor current being measured; a descent motor current value without a maintenance worker, which is obtained by driving the motor in a descent direction at the rated voltage and the rated frequency without the maintenance worker on the car, and measuring the motor current; a descent motor current value with a maintenance worker present, the value being obtained by driving the motor in a descent direction at the rated voltage and the rated frequency with the maintenance worker on the car, and measuring the motor current; and The load without a maintenance person is set to 0%, and the load with a maintenance person is set to the ratio (%) of the weight of the maintenance person to the rated load capacity of the car. From the measured ascent motor current value without a maintenance person, ascent motor current value with a maintenance person, descent motor current value without a maintenance person, and descent motor current value with a maintenance person, the ascent motor current value without a maintenance person for the load can be obtained as the ascent measurement point without a maintenance person, the ascent motor current value with a maintenance person as the ascent measurement point with a maintenance person, the descent motor current value without a maintenance person as the descent measurement point without a maintenance person, and the descent motor current value with a maintenance person as the descent measurement point with a maintenance person, respectively, thereby creating the load test graph.

[0014] The load test graph is created by plotting the motor current value on the vertical axis and the load on the horizontal axis in a coordinate system as follows: Plotting the ascending measurement points without a maintenance person, the ascending measurement points with a maintenance person, the descending measurement points without a maintenance person, and the descending measurement points with a maintenance person; an ascent graph comprising a first ascent line connecting the ascent measurement point without a maintenance worker and the ascent measurement point with a maintenance worker with a straight line; a first ascent slope that is the slope of the first ascent line calculated, and a second ascent line with a second ascent slope that is a positive value from the ascent-side balance point where the intersection of the first ascent line and a point where the motor current is zero is set as an ascent-side balance point; a descending graph comprising a first descending line connecting the no-maintenance-person descending measurement point and the maintenance-person descending measurement point with a straight line, a first descending slope that is the slope of the first descending line calculated, and a second descending line with a second descending slope that is a positive value of the first descending slope from the descending-side balance point, with the intersection of the first descending line and a point where the motor current is zero set as the descending-side balance point; This can be done by obtaining [Effects of the Invention]

[0015] According to the elevator load testing method of the present invention, the elevator car is raised and lowered with and without a maintenance worker in the car, and the current values ​​of the ascending motor without a maintenance worker, the descending motor without a maintenance worker, the ascending motor current with a maintenance worker, and the descending motor current with a maintenance worker are obtained, and a load test graph including the balance point can be created from these measurements. Creating the load test graph does not require the effort of carrying in or transferring test weights corresponding to the rated load, making it extremely easy to create the load test graph. [Brief explanation of the drawings]

[0016] [Figure 1] Figure 1 is a schematic diagram of an elevator. [Figure 2] FIG. 2 is a block diagram of the load testing device. [Figure 3] Figure 3 shows an explanatory diagram of an elevator undergoing a load test (a) without a maintenance worker and (b) with a maintenance worker. [Figure 4] Figure 4 shows a coordinate system where the horizontal axis represents the load and the vertical axis represents the motor current value, plotting the measurement points U0, U1, D0, and D1. [Figure 5] FIG. 5 shows load test graphs (ascending graph UG, descending graph DG) obtained by the method of the present invention. [Figure 6] FIG. 6 is a graph in which measurement points obtained in a load test specified by JIS are plotted on a load test graph obtained by the method of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of the present invention will be described with reference to the drawings.

[0018] 1 is a schematic diagram of an elevator 10 according to one embodiment of the present invention. The elevator 10 is configured by connecting a car 20 in which passengers board and a counterweight 30 that balances the car 20 with a rope 40, and the rope 40 is hung between a sheave 51 and a deflector pulley 52. ​​A motor 50 that functions as a hoist is connected to the sheave 51, and by rotating the motor 50, the car 20 is raised and lowered.

[0019] The load test of the present invention can be carried out, for example, when the elevator 10 is installed, that is, when the installation work is completed, or during maintenance.

[0020] 2 shows one embodiment of a load test device 70 that measures the results of a load test. The load test device 70 includes an ammeter 72 that measures the current value of the motor 50, an input unit 73 that inputs the weight (body weight) of the maintenance worker 60 riding on the car 20, and a processing unit 71. The processing unit 71 calculates measurement points as follows based on the current value from the ammeter 72 and the weight ratio of the maintenance worker 60 (converted to load W%) from the input unit 73, creates a load test graph, and displays it on a display unit 74 such as an LCD so that the maintenance worker can see it.

[0021] The load test is carried out in two states: one in which the maintenance person 60 is included in the car 20 but no other heavy objects such as weights are loaded (hereinafter referred to as "without a maintenance person"), as shown in Figure 3(a), and one in which the maintenance person 60 is loaded in the car 20 (hereinafter referred to as "with a maintenance person"), as shown in Figure 3(b). With no maintenance person, the ratio of heavy objects to the rated load capacity is 0%.

[0022] On the other hand, when a maintenance person is present, the maintenance person 60 himself plays the role of the test weight in the conventional load test. Therefore, the present invention completely eliminates the need to bring in heavy objects such as test weights, which were previously necessary for load tests. When a maintenance person is present, the maintenance person 60's exact weight must be measured in advance, and the processing unit 71 must calculate what percentage of the rated load capacity of the car 20 that weight corresponds to. For example, if the maintenance person 60 weighs 65 kg and the rated load capacity of the car 20 is 1000 kg, the proportion of the maintenance person 60's weight to the rated load capacity of the car is 6.5%.

[0023] In the load test, under the above conditions of no maintenance personnel and with a maintenance personnel present, motor 50 is rotated at the rated voltage and rated frequency to run car 20, and ammeter 72 is used to measure the current value of motor 50 at the midpoint of the total lifting distance, i.e., the position where car 20 and counterweight 30 pass each other. The motor current value in the upward operating direction without a maintenance personnel is referred to as upward motor current value IU0 without a maintenance personnel, the motor current value in the upward operating direction with a maintenance personnel is referred to as upward motor current value IU1 with a maintenance personnel, the motor current value in the downward operating direction without a maintenance personnel is referred to as downward motor current value ID0 without a maintenance personnel, and the motor current value in the downward operating direction with a maintenance personnel is referred to as downward motor current value ID1 with a maintenance personnel.

[0024] The measured motor current values ​​are input to the processing unit 71, which obtains measurement points U0, U1, D0, and D1 consisting of the load and motor current value relative to the driving direction. Specifically, the measurement points are the following four points, with the load on the X coordinate and the motor current value on the Y coordinate.

[0025] No maintenance personnel required. Rise measurement point U0 (0, IU0) Maintenance staff present, rising measurement point U1 (W, IU1) No maintenance personnel descending measurement point D0(0,ID0) Maintenance personnel present, descending measurement point D1 (W, ID1)

[0026] Next, as shown in FIG. 4, the processing unit 71 plots the measurement points U0, U1, D0, and D1 on a coordinate system with the load on the horizontal axis (X axis) and the motor current value on the vertical axis (Y axis).

[0027] The processing unit 71 then derives a load test graph from the plotted measurement points U0, U1, D0, and D1. There are two types of load test graphs: an ascending graph UG and a descending graph DG.

[0028] The ascending graph UG is derived as follows. First, as shown in FIG. 5, the processing unit 71 calculates a first ascending line UP1 connecting the ascending measurement point U0 (0, IU0) without a maintenance worker and the ascending measurement point U1 (W, IU1) with a maintenance worker, and calculates a first ascending slope SUP1 of this first ascending line UP1. Next, the processing unit 71 calculates the intersection of the first ascending line UP1 with the zero motor current in the coordinate system as the ascending-side balance point UPB. Furthermore, the processing unit 71 calculates a second ascending slope SUP2 by taking the slope of the first ascending slope SUP1 as a positive value, and derives a second ascending line UP2 of the second ascending slope SUP2 (however, the motor current value is in the positive range) from the ascending-side balance point UPB. This allows the ascending graph UG, which is the ascending-side load test graph.

[0029] A descending graph DG is obtained using a similar procedure. Specifically, as shown in FIG. 5, the processing unit 71 calculates a first descending line DN1 connecting the no-maintenance-personnel descending measurement point D0(0,ID0) and the maintenance-personnel-present descending measurement point D1(W,ID1) and a first descending slope SDN1 of this first descending line DN1. Next, the processing unit 71 calculates the intersection of the first descending line DN1 with the zero motor current in the coordinate system as the descending-side balance point DNB. Furthermore, a second descending slope SDN2 is calculated by setting the slope of the first descending slope SDN1 to a positive value, and the second descending line DN2 (where the motor current value is in the positive range) of the second descending slope SDN2 is derived from the descending-side balance point DNB. This allows the processing unit 71 to obtain a descending graph DN, which is a load test graph on the descending side.

[0030] The obtained load test graphs (ascending graph UG and descending graph DG) can be displayed on the display unit 14. FIG. 5 shows an example of such a display. Referring to the figure, it can be seen that the ascending graph UP and descending graph DN are both V-shaped graphs. Then, the counterweight can be adjusted based on the obtained load test graphs (ascending graph UP and descending graph DN). Furthermore, after adjusting the counterweight, a load test can be performed again, and by referring to the load test graphs, it can be confirmed whether the counterweight has been adjusted correctly. A test weight is not required for this confirmation load test either.

[0031] According to the present invention, there is no need to prepare multiple test weights, repeatedly raise and lower them, and obtain motor current values ​​in order to obtain a load test graph. In other words, since test weights are not required, there is also no need to transport or reload them. Furthermore, motor current values ​​can be obtained by raising and lowering the motor in two patterns: without a maintenance worker 60 on the load and with a maintenance worker 60 on the load. The load test graph can be derived from these obtained motor current values. This has the advantage of significantly reducing the effort and time required for load testing.

[0032] For example, in a conventional load test in which multiple test weights are prepared and transferred, it takes 20 minutes x 3 people for adjustment work and 220 minutes x 3 people for preparation and cleanup work, for a total of 720 minutes. However, in the load test of the present invention, the adjustment work takes only 20 minutes x 2 people, for a total of 40 minutes, achieving a significant reduction not only in time but also in labor costs.

[0033] In order to confirm the reliability of the load test graphs (rising graph UP and falling graph DN) obtained by the present invention, measurement points were calculated by an actual load test using the method specified in JIS and plotted on the coordinate system of the present invention.

[0034] The load test specified by JIS was conducted using the load test device 70 shown in Figure 2 in the following manner. First, based on the load test specified in JIS A4302:2006, weights of 0%, 25%, 50%, 75%, 100%, and 110% of the rated load capacity were prepared on the car 20. Then, with each weight loaded, the motor 50 was rotated at the rated voltage and rated frequency to run the car 20, and the motor current value was measured at the midpoint of the entire lifting distance, i.e., the position where the car 20 and counterweight 30 passed each other. Measurements were conducted during both ascending and descending operation, and measurement points were obtained using the load and motor current value as coordinates.

[0035] FIG. 6 plots measurement points obtained in a load test specified by JIS on the load test graph of the present invention (rising graph UP and falling graph DN). Note that the measurement points at 50% load are plotted with the rising and falling sides overlapping. Referring to the figure, it can be seen that the measurement points measured according to JIS are present on the load test graph of the present invention (rising graph UP and falling graph DN). In other words, it can be seen that the load test graphs (rising graph UP and falling graph DN) obtained by the method of the present invention are reliable.

[0036] The above description is for the purpose of explaining the present invention, and should not be construed as limiting the invention described in the claims or narrowing its scope. Furthermore, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications are possible within the technical scope described in the claims.

[0037] For example, in the above embodiment, one maintenance worker is exemplified as the maintenance worker 60, but the load test may be performed in a situation where two or more maintenance workers are simultaneously riding on the car 20. In this case, the weight of the maintenance worker 60 is the total weight of all the maintenance workers.

[0038] The weight of the maintenance man 60 is preferably heavy, but is preferably limited to 30% of the maximum load capacity of the car 20. This is because the ascending balance point UPB is between 30% and 50% of the load, and if the load ratio of the maintenance man 60 to the maximum load capacity exceeds 30%, the ascending balance point UPB cannot be derived.

[0039] Furthermore, in the above embodiment, the maintenance personnel 60 is used as a heavy object in place of the test weight, but a load test can also be performed by placing a test weight on the car 20 instead of the maintenance personnel 60. Even in this case, measurements can be performed using one type of test weight up to 30% of the maximum load capacity of the car 20.

[0040] Furthermore, in the above embodiment, the car 20 is made to make one round trip to measure the motor current value for each condition, with and without a maintenance worker, but the car 20 may be made to make multiple round trips, for example, three round trips, and when the variation in the measured motor current values ​​is less than a predetermined value, the average value may be used as the motor current value. [Explanation of symbols]

[0041] 10. Elevator 20 baskets 30 Counterweight 50 motor 60 Maintenance staff

Claims

[Claim 1] An elevator load test method includes: connecting a car and a counterweight with a rope, and winding up the rope with a motor; driving the motor at a rated voltage and a rated frequency; performing ascending and descending operations; measuring motor current values ​​relative to loads; and creating a load test graph including a balance point where the car and the counterweight are in equilibrium with each other from the measured load and motor current values; driving the motor in an ascending direction at the rated voltage and the rated frequency with a state in which a maintenance worker is not on the car and with the maintenance worker on the car, and creating the load test graph from the obtained motor current values; A load test method for an elevator, comprising: The motor current is a no-maintenance-person ascending motor current value obtained by driving the motor in an ascending direction at the rated voltage and the rated frequency without a maintenance person on the car and measuring the motor current; a maintenance worker-present ascending motor current value obtained by driving the motor in an ascending direction at the rated voltage and the rated frequency with the maintenance worker on the car, and measuring the motor current; a descent motor current value without a maintenance worker, which is obtained by driving the motor in a descent direction at the rated voltage and the rated frequency without the maintenance worker on the car, and measuring the motor current; a descent motor current value with a maintenance worker present, which is obtained by driving the motor in a descent direction at the rated voltage and the rated frequency with the maintenance worker on the car, and measuring the motor current; and The load without a maintenance person is set to 0%, and the load with a maintenance person is set to the ratio (%) of the weight of the maintenance person to the rated load capacity of the car, and from the measured ascent motor current value without a maintenance person, ascent motor current value with a maintenance person, ascent motor current value without a maintenance person, and as descent motor current value with a maintenance person, the ascent motor current value without a maintenance person is obtained as an ascent measurement point without a maintenance person, the ascent motor current value with a maintenance person is obtained as an ascent measurement point with a maintenance person, the descent motor current value without a maintenance person is obtained as a descent measurement point without a maintenance person, and the descent motor current value with a maintenance person is obtained as a descent measurement point with a maintenance person, respectively, to create the load test graph; The load test graph is created by plotting the motor current value on the vertical axis and the load on the horizontal axis in a coordinate system as follows: Plotting the ascending measurement points without a maintenance person, the ascending measurement points with a maintenance person, the descending measurement points without a maintenance person, and the descending measurement points with a maintenance person; an ascent graph comprising a first ascent line connecting the ascent measurement point without a maintenance worker and the ascent measurement point with a maintenance worker with a straight line; a first ascent slope that is the slope of the first ascent line calculated, a point of intersection of the first ascent line and a point where the motor current is zero set as an ascent-side balance point, and a second ascent line with a second ascent slope that makes the first ascent slope a positive value from the ascent-side balance point; a descending graph comprising a first descending line connecting the no-maintenance-person descending measurement point and the maintenance-person descending measurement point with a straight line, a first descending slope that is the slope of the first descending line calculated, a second descending line with a second descending slope that is a positive value of the first descending slope from the descending-side balance point where the intersection of the first descending line and a point where the motor current is zero is set as a descending-side balance point; This is done by obtaining Elevator load testing methods.

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