CN113860111A - Vertical elevator overload protection device detector - Google Patents
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- 238000005259 measurement Methods 0.000 claims description 13
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/14—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions in case of excessive loads
- B66B5/145—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions in case of excessive loads electrical
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Abstract
The invention discloses a detector for an overload protection device of a vertical elevator, wherein a grating micrometer device is arranged on a telescopic bracket for installing the overload protection device in the elevator, and is used for detecting a central position signal of a car bottom and transmitting the central position signal to a displacement detector; under the no-load condition, the Hall approach switch moves towards the direction approaching the magnetic steel according to the overload central displacement, and whether the overload protection device is qualified or not is judged according to the action condition of the overload protection device, so that the overload protection device is detected. When the detection is carried out by using the invention, the weights do not need to be carried according to the actual weight of the overload load, the detection efficiency is greatly improved, the detection result is reliable, and the safety guarantee is provided for the detection of the elevator overload protection.
Description
Technical Field
The invention relates to the technical field of elevator detection, in particular to a detector for detecting an overload protection device arranged in a vertical elevator.
Background
An elevator overload protection device is an important safety component for preventing the elevator from running in an overload state. The existing detection aiming at the overload protection device of the vertical elevator adopts a loading test method, and the specific method is that the total load during overload, namely the overload load, is calculated according to the rated load capacity of the elevator, and weights are uniformly placed in a lift car until the overload load is reached; if the overload protection device acts when reaching the overload load, the overload protection device meets the standard requirement; if the elevator moves in advance, the adjustment of the overload action value is over small, the elevator is prompted to overload too early, and the use efficiency is reduced; if the elevator is in a lagging action or still does not act after reaching the overload load, the overload action value is adjusted too much or the overload protection device is damaged, and the condition can cause the overload running of the elevator to form serious potential safety hazard. In actual operation, the labor intensity of carrying weights in a mode of loading weights in a lift car is high, and the inspection consumes long time, so that the requirement of carrying out a loading test on an overload protection device cannot be guaranteed, if the overload protection device fails, the overload protection device cannot be found and processed in time, and the normal operation and safety of an elevator are seriously affected.
Patent document No. CN210505130U discloses an elevator overload device tester, which comprises a measuring host, a universal level, a bottom plate, a hydraulic device, a suspension assembly, a displacement measuring device and an adjusting assembly, wherein the hydraulic device is used for applying force to a car, the displacement measuring device and a sensor are used for obtaining measurement data, and the overload load and the compression amount of a spring are synchronously measured, so as to evaluate whether an elevator overload protection device meets the standard or not. However, since the pressure is concentrated in a local area and cannot completely cover the elevator car, the detection of the overload sensor is not accurate, and meanwhile, the tester is complex in equipment, inconvenient for detection personnel to carry, complex in assembly process and inconvenient to use.
Patent document No. CN107043055A discloses an elevator overload switch detection device without load, which includes: decide clamp splice, support, trapezoidal line lead screw, move clamp splice, pressure sensor and drive arrangement, through drive arrangement, with the moment of force on the trapezoidal line lead screw that can reciprocate that has pressure sensor. One end of the connecting piece is fixed on the harmonic speed reducer, and the other end of the connecting piece acts on the trapezoidal thread screw rod. The servo motor is positioned accurately and output stably, the harmonic speed reducer can realize large reduction ratio, and the output torque of the servo motor is amplified. The device does not need weights and is portable, but only the pressure sensor plays a role in detection, and the deformation quantity of the elevator car cannot be measured, so that the complete maintenance of the overload device of the elevator cannot be realized.
Disclosure of Invention
The invention provides the detector and the detection method for the overload protection device of the vertical elevator, aiming at avoiding the defects in the prior art, so that the detection process is more convenient, a large number of weights do not need to be carried, the detection efficiency is improved, the detection cost and the labor intensity are reduced, the regular detection is ensured to be carried out smoothly, and the safe and reliable operation of the elevator is further ensured.
The invention adopts the following technical scheme for realizing the purpose of the invention:
the invention relates to a vertical elevator overload protection device detector, which comprises: the car frame is formed by rigidly connecting an upper cross beam, an upright post and a lower cross beam through bolts and is hung below a traction steel wire rope; the car top, the car wall and the car bottom are rigidly connected through bolts to form a car; a shock pad is arranged between the lower cross beam and the car bottom, so that the car is supported on the lower cross beam in the car frame by the shock pad; the overload protection device includes: the car comprises a magnetic steel arranged at the center of a car bottom, a telescopic bracket arranged on a lower cross beam, and a Hall proximity switch arranged on the telescopic bracket, wherein the Hall proximity switch is positioned right below the magnetic steel, and the Hall proximity switch and the magnetic steel form a proximity sensor; the car bearing the load enables the car bottom to be depressed, when the load reaches a set value, the proximity sensor outputs an alarm signal, and overload protection is realized according to the alarm signal; the method is characterized in that: the structure form of the detector for the overload protection device of the vertical elevator is as follows: the system comprises a telescopic bracket, a displacement detector, a grating micrometering device, a grating sensor and a grating sensor, wherein the telescopic bracket is provided with the detachable grating micrometering device, the grating micrometering device is used for detecting to obtain a central position signal of the car bottom, the central position signal of the car bottom is transmitted to the displacement detector through a data transmission line, and the displacement detector carries out data processing on the central position signal of the car bottom under a set load condition and calculates to obtain the overload central displacement of the car bottom; under the no-load condition, the Hall approach switch moves towards the direction approaching the magnetic steel according to the overload central displacement, and whether the overload protection device is qualified or not is judged according to the action condition of the overload protection device, so that the overload protection device is detected.
The detector for the overload protection device of the vertical elevator is also characterized in that: the grating micrometer device takes a magnetic steel support which can be adsorbed and fixed on the upper end face of the telescopic bracket by utilizing magnetic force as a base; the magnetic steel support is provided with a through hole, and the Hall proximity switch protrudes in the through hole; the grating micrometer is characterized in that the support is provided with an upright sleeve, the upright rod is inserted into the upright sleeve and is fixed by a tacking bolt, and the grating micrometer is fixedly installed by utilizing the upright rod.
The detector for the overload protection device of the vertical elevator is also characterized in that: taking 16-20 small weights with the same weight as the loading weight, wherein the weight of each small weight is 3 kg; the detector for the overload protection device of the vertical elevator realizes detection according to the following steps:
step 1: the no-load measurement is carried out by utilizing a grating micrometer device under the no-load state of the lift car and carrying out information processing by a displacement detector to obtain the central position of the no-load car bottom;
step 2: the two side edges are loaded and measured, namely loading weights are placed in the lift car, the loading weights are divided into two groups according to equal weight, and the two groups of loading weights are uniformly arranged in the lift car in a straight line along the side lines of the two side edges of the car bottom to form two parallel side edge loading lines; measuring by using a grating micrometer device, and processing information by using a displacement detector to obtain the central position of the side loading car bottom;
and step 3: the center line loading measurement is to place loading weights in the lift car, wherein all the loading weights are uniformly arranged in the lift car along the center line of the bottom of the lift car in a straight line to form a center line loading line parallel to the side loading line, the measurement is carried out by using a grating micrometer device, and information processing is carried out by a displacement detector to obtain the center position of the center line loading bottom of the lift car;
and 4, step 4: calculating to obtain the car bottom center overload displacement of the car under the overload load according to the no-load car bottom center position, the side loading car bottom center position and the center line loading car bottom center position;
and 5: and setting a no-load lift car, moving the Hall proximity switch towards the direction approaching the magnetic steel according to the overload displacement of the center of the lift car bottom through the telescopic support, and judging whether the overload protection device is normal or not according to the working condition of the overload protection device under the overload displacement to realize the detection of the overload protection device.
The detector for the overload protection device of the vertical elevator is also characterized in that: in the step 4, the car bottom center overload displacement Y under the overload load M is calculated and obtained according to the formula (1):
Y＝[(A1-A2)+((A2-A3)×5/8)]×M/G (1)
wherein:
A1is the center position of the empty car bottom; a. the2Loading the center position of the car bottom for the side edge;
A3loading the central position of the car bottom for the central line; g is the total weight of the loading weight.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention has simple structure, low cost, safety and reliability, and can not damage related equipment; the operation process is convenient and quick, and the detection of the elevator overload protection device can be independently completed by one person;
2. the detection process implemented by the detector does not need to carry weights according to the actual weight of the overload load, so that the detection process is greatly simplified, the detection efficiency is improved, and the working strength of detection personnel is greatly reduced;
3. the invention has reliable detection result and provides safety guarantee for the detection of the elevator overload protection.
Drawings
Fig. 1 is a schematic view of a simple beam structure in a vertical elevator with a bottom plate supported on shock pads;
FIG. 2 is a schematic view of a structure of a vertical elevator with a car frame suspended below a traction wire rope;
FIG. 3 is a schematic view of the installation of the grating micrometer device of the present invention;
FIG. 4 is a schematic diagram of centerline loading during a detection process implemented in accordance with the present invention;
FIG. 5 is a schematic view of the loading of two sides during the detection process of the present invention;
reference numbers in the figures: the device comprises a traction steel wire rope 1, an upper cross beam 2, a car roof 3, a car wall 4, a vertical column 5, a car bottom 6, a shock pad 7, a lower cross beam 8, magnetic steel 9, a telescopic bracket 10, a Hall proximity switch 11, a grating micrometer 12, a magnetic steel support 12a, a through hole 12b, a clinch bolt 12c, a vertical rod 12d, a bolt 12e, a grating micrometer 12f, a data transmission line 13, a displacement detector 14 and a loading weight 15.
Detailed Description
Referring to fig. 1, 2 and 3, the vertical elevator according to the present embodiment includes: the car frame is formed by rigidly connecting an upper cross beam 2, an upright post 5 and a lower cross beam 8 through bolts and is hung below a traction steel wire rope 1; the car top 3, the car wall 4 and the car bottom 6 are rigidly connected through bolts to form a car; a cushion 7 is installed between the lower cross member 8 and the platform 6, so that the car is supported on the lower cross member 8 in the car frame by the cushion 7.
As shown in fig. 2 and 3, the overload protection apparatus installed in the vertical elevator according to the present embodiment includes: the car comprises a magnetic steel 9 arranged at the center of a car bottom 6, a telescopic bracket 10 arranged on a lower cross beam 8, and a Hall proximity switch 11 arranged on the telescopic bracket 10, wherein the Hall proximity switch 11 is positioned right below the magnetic steel 9, and the Hall proximity switch 11 and the magnetic steel 9 form a proximity sensor; the car bottom 6 is depressed by the load bearing car, when the load reaches a set value, the proximity sensor outputs an alarm signal, and overload protection is realized according to the alarm signal.
As shown in fig. 2 and 3, the vertical elevator overload protection device detector provided in this embodiment has the following structural form:
the telescopic bracket 10 is provided with a detachable grating micrometer device 12, the grating micrometer device 12 is used for detecting to obtain a central position signal of the car bottom 6, the central position signal of the car bottom 6 is transmitted to a displacement detector 14 through a data transmission line 13, and the displacement detector 14 carries out data processing on the central position signal of the car bottom 6 under a set load condition and calculates to obtain the overload central displacement of the car bottom 6; under the no-load condition, the Hall proximity switch 11 moves towards the direction approaching the magnetic steel 9 according to the overload central displacement, and whether the overload protection device is qualified or not is judged according to the action condition of the overload protection device, so that the overload protection device is detected.
As shown in fig. 2 and 3, in a specific implementation, the grating micrometer device 12 is based on a magnetic steel support 12a that can be attracted and fixed on the upper end face of the telescopic bracket 10 by using magnetic force; a through hole 12b is arranged on the magnetic steel support 12a, and the Hall proximity switch 11 protrudes in the through hole 12 b; a vertical sleeve is arranged on the support 12a, the vertical rod 12d is inserted into the vertical sleeve and fixed by a tacking bolt 12c, and the grating micrometer 12f is fixedly installed by the vertical rod 12d and a bolt 12 e; the grating micrometer 12f can set the height and angle on the vertical rod 12c, the resolution of the grating micrometer 12f is 0.5 μm, namely, the grating micrometer 12f sends out a pulse every time the measuring head generates 0.5 μm of axial movement, therefore, the precision can reach 10-3mm, and the detection accuracy is ensured.
The displacement detector 14 selects a high-performance singlechip AT89S52 as a CPU, and an EEPROM memory with 8KB multiplied by 8bit is used for storing a bottom-layer program of the system to calculate the overload center displacement Y; in order to store data in the detection process, the displacement detector 14 can also extend an 8KB x 8bit SRAM chip 6264; in order to facilitate the user to input and read data, the LED digital display can be externally connected with a matrix keyboard and an LED digital display; the displacement detector 14 is externally connected with a rechargeable lithium battery through a USB interface, the output voltage is +5V, the maximum working current of the displacement detector 14 is 190mA, and the displacement detector can continuously work for 105 hours after the lithium battery is fully charged, so that the endurance is guaranteed.
Taking 16-20 small weights with the same weight as the loading weight 15, wherein the weight of each small weight is 3kg, and detecting the overload protection device of the vertical elevator according to the following steps:
step 1: in the no-load measurement, under the no-load state of the lift car, the grating micrometer device 12 is used for measuring, and the displacement detector 14 is used for processing information to obtain the center position of the no-load car bottom;
step 2: the loading measurement of the two side edges is to place loading weights 15 in the lift car, as shown in fig. 5, the loading weights 15 are divided into two groups according to equal weight, and the two groups of loading weights are uniformly arranged in the lift car in a straight line along the side lines of the two side edges of the car bottom 6 to form two parallel side loading lines; measuring by using a grating micrometer 12, and processing information by using a displacement detector 14 to obtain the central position of the side loading car bottom;
and step 3: the center line loading measurement is to place loading weights 15 in the car, as shown in fig. 4, all the loading weights 15 are uniformly arranged in the car in a straight line along the center line of the car bottom 6 to form a center line loading line parallel to the side loading line, the grating micrometer 12 is used for measurement, and information processing is carried out through the displacement detector 14 to obtain the center position of the center line loading car bottom;
and 4, step 4: calculating to obtain the car bottom center overload displacement of the car under the overload load according to the center position of the no-load car bottom, the center positions of the side-loading car bottoms and the center position of the center line loading car bottom;
and 5: and setting an unloaded lift car, moving the Hall proximity switch 11 towards the direction approaching the magnetic steel 9 according to the overload displacement of the center of the lift car bottom through the telescopic support 10, and judging whether the overload protection device is normal or not according to the working condition of the overload protection device under the overload displacement to realize the detection of the overload protection device.
In the specific implementation, in step 4, the car bottom center overload displacement Y under the overload load M is calculated and obtained according to the formula (1):
Y＝[(A1-A2)+((A2-A3)×5/8)]×M/G (1)
wherein:
A1is the center position of the empty car bottom; a. the2Loading the center position of the car bottom for the side edge;
A3loading the central position of the car bottom for the central line; g is the total weight of the loading weight 15.
The detection working principle is as follows:
when the car bottom is loaded by a load G, the central displacement X of the car bottom can be decomposed into a damping pad deformation X1And the central deformation X of the car bottom2Namely:
X＝X1+X2 (2)
the elevator car bottom is equivalent to a simple beam on a linear shock pad, as shown in figure 1; according to the principle of material mechanics, the deformation quantity X of the linear shock pad1Downward deflection of the simply supported beam (namely the self central deformation X of the car bottom)2) The displacement of the car bottom center is in direct proportion to the load when the car is loaded; based on this, the platform center overload displacement Y under the overload load M is represented by formula (3):
Y＝X×M/G＝(X1+X2)×M/G (3)
about the deformation X of the shock pad1: theoretically, the damping cushion deformation quantity can be measured by loading the car bottom and then directly using a measuring tool, but the damping cushion deformation quantity X can be measured in actual operation1Direct measurement is not convenient, and for this reason, it is equivalent within an error allowance range.
FIG. 5 shows the loading of the platform on both sides, where the central displacement X of the platform is equal to the deformation X of the cushion1The amount of central deformation X of the car bottom2Summing; meanwhile, the central deformation X of the car bottom is changed when the side is loaded2Very small, with respect to the damping pad deformation X1Negligible, from this it follows: x is approximately equal to X1Namely: when side loading is carried out, the deformation quantity X of the shock pad1Is considered to be equal to the displacement X of the center of the platform.
Meanwhile, because of having: x is A1-A2Thereby obtaining a damping pad deformation amount X1Comprises the following steps:
X1＝A1-A2 (4)
about the central deformation X of the platform2: the elevator is actually used for uniformly loading the car bottom, and the invention adopts a way of loading the car bottom by a central line for facilitating detection; the following results are obtained by material mechanics analysis: generated in the centre of the platform itself during uniform loading of the platformThe amount of deformation is 5/8 of the amount of deformation generated at the center of the platform itself when the platform neutral line is loaded, so there are:
X2＝(A2-A3)×5/8 (5)
the formula (1) is obtained according to the formulae (3), (4) and (5).
In the detection process, firstly, the grating micrometer device 12 is used for measuring A1、A2And A3And stored in the displacement detector 14; calculating by the displacement detector 14 according to the formula (1) to obtain the car bottom center overload displacement Y under the overload load M; then setting the lift car to be in an idle load condition, moving the Hall proximity switch 11 upwards by a distance Y through the telescopic bracket 10, and when the moving distance reaches a value Y, sending an alarm by an overload protection device in the elevator to obtain a qualified result; if the overload protection device in the elevator gives an alarm when the moving distance does not reach the Y value, or the overload protection device in the elevator does not give an alarm when the moving distance exceeds the Y value, the overload protection device is judged to be unqualified, and therefore the detection work is finished.
Claims (4)
1. A vertical elevator overload protection device detector, the vertical elevator comprising: the car frame is formed by rigidly connecting an upper cross beam (2), an upright post (5) and a lower cross beam (8) through bolts, and is hung below a traction steel wire rope (1); the car top (3), the car wall (4) and the car bottom (6) are rigidly connected through bolts to form a car; a shock pad (7) is arranged between the lower cross beam (8) and the car bottom (6), so that the car is supported on the lower cross beam (8) in the car frame by the shock pad (7); the overload protection device includes: the car comprises magnetic steel (9) arranged at the center of a car bottom (6), a telescopic bracket (10) arranged on a lower cross beam (8), and a Hall proximity switch (11) arranged on the telescopic bracket (10), wherein the Hall proximity switch (11) is positioned right below the magnetic steel (9), and the Hall proximity switch (11) and the magnetic steel (9) form a proximity sensor; the car bottom (6) is pressed and recessed by the car bearing the load, when the load reaches a set value, the proximity sensor outputs an alarm signal, and overload protection is realized according to the alarm signal; the method is characterized in that: the structure form of the detector for the overload protection device of the vertical elevator is as follows: the telescopic support (10) is provided with a detachable grating micrometer device (12), the grating micrometer device (12) is used for detecting and obtaining a central position signal of the car bottom (6), the central position signal of the car bottom (6) is transmitted to a displacement detector (14) through a data transmission line (13), the displacement detector (14) carries out data processing on the central position signal of the car bottom (6) under a set load condition, and the overload central displacement of the car bottom (6) is obtained through calculation; under the no-load condition, the Hall proximity switch (11) moves towards the direction approaching the magnetic steel (9) according to the overload center displacement, and whether the overload protection device is qualified or not is judged according to the action condition of the overload protection device, so that the overload protection device is detected.
2. The vertical elevator overload protection device detector of claim 1, wherein: the grating micrometer device (12) takes a magnetic steel support (12a) which can be adsorbed and fixed on the upper end surface of the telescopic bracket (10) by utilizing magnetic force as a base; a through hole (12b) is formed in the magnetic steel support (12a), and the Hall proximity switch (11) protrudes in the through hole (12 b); the support (12a) is provided with an upright sleeve, an upright rod (12d) is inserted into the upright sleeve and is fixed by a tacking bolt (12c), and the grating micrometer (12f) is fixedly installed by the upright rod (12 d).
3. The vertical elevator overload protection device detector of claim 1, wherein:
taking 16-20 small weights with the same weight as the loading weight (15), wherein the weight of each small weight is 3 kg; the detector for the overload protection device of the vertical elevator realizes detection according to the following steps:
step 1: in the no-load measurement, under the no-load state of the lift car, a grating micrometer device (12) is used for measuring, and information processing is carried out by a displacement detector (14) to obtain the center position of the bottom of the no-load lift car;
step 2: the loading measurement of the two side edges is realized by placing loading weights (15) in the lift car, dividing the loading weights (15) into two groups according to equal weight, and arranging the two groups of loading weights in the lift car in a straight line and uniformly along the side lines of the two side edges of the car bottom (6) to form two parallel side loading lines; measuring by using a grating micrometer device (12), and processing information by using a displacement detector (14) to obtain the central position of the side loading car bottom;
and step 3: the center line loading measurement is that loading weights (15) are placed in a lift car, all the loading weights (15) are uniformly arranged in the lift car along the center line of a car bottom (6) in a straight line to form a center line loading line parallel to the side loading line, the measurement is carried out by using a grating micrometer (12), and information processing is carried out by using a displacement detector (14), so that the center position of the center line loading car bottom is obtained;
and 4, step 4: calculating to obtain the car bottom center overload displacement of the car under the overload load according to the no-load car bottom center position, the side loading car bottom center position and the center line loading car bottom center position;
and 5: and setting an unloaded lift car, moving the Hall proximity switch (11) towards the direction approaching the magnetic steel (9) through the telescopic bracket (10) according to the overload displacement of the center of the lift car bottom, and judging whether the overload protection device is normal or not according to the working condition of the overload protection device under the overload displacement to realize the detection of the overload protection device.
4. The vertical elevator overload protection device detector of claim 3, wherein:
in the step 4, the car bottom center overload displacement Y under the overload load M is calculated and obtained according to the formula (1):
Y＝[(A1-A2)+((A2-A3)×5/8)]×M/G(1)
wherein:
A1is the center position of the empty car bottom; a. the2Loading the center position of the car bottom for the side edge;
A3loading the central position of the car bottom for the central line; g is the total weight of the loading weight (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111356119.9A CN113860111A (en) | 2021-11-16 | 2021-11-16 | Vertical elevator overload protection device detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111356119.9A CN113860111A (en) | 2021-11-16 | 2021-11-16 | Vertical elevator overload protection device detector |
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| CN113860111A true CN113860111A (en) | 2021-12-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114655808A (en) * | 2022-05-25 | 2022-06-24 | 河南省矿山起重机有限公司 | Method for calibrating elevator overload protection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105253738A (en) * | 2015-10-23 | 2016-01-20 | 嘉兴市特种设备检验检测院 | Detection method for elevator overload protection device |
| CN109775496A (en) * | 2019-02-22 | 2019-05-21 | 深圳市特种设备安全检验研究院 | No-load detects the device of lift car overload switch state |
| CN208916536U (en) * | 2018-10-09 | 2019-05-31 | 北京通力亿鑫电梯有限公司 | A kind of elevator overload protection detection device |
-
2021
- 2021-11-16 CN CN202111356119.9A patent/CN113860111A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105253738A (en) * | 2015-10-23 | 2016-01-20 | 嘉兴市特种设备检验检测院 | Detection method for elevator overload protection device |
| CN208916536U (en) * | 2018-10-09 | 2019-05-31 | 北京通力亿鑫电梯有限公司 | A kind of elevator overload protection detection device |
| CN109775496A (en) * | 2019-02-22 | 2019-05-21 | 深圳市特种设备安全检验研究院 | No-load detects the device of lift car overload switch state |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114655808A (en) * | 2022-05-25 | 2022-06-24 | 河南省矿山起重机有限公司 | Method for calibrating elevator overload protection device |
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Application publication date: 20211231 |