A safety testing system for retrofitting elevators in old residential communities

Abstract

This application discloses a safety detection system for retrofitted elevators in old residential communities, including a control unit, a wireless communication unit, and a detection unit. The detection unit includes a housing, which comprises a top plate, a bottom plate, a back plate, and a fixing block. An infrared human body sensing unit is installed at the fixing block; a temperature sensor, a humidity sensor, and a vibration sensor are installed at the top plate. This safety detection system can simultaneously detect the safety of elevator use and the elevator's own operational status and safety. The control room can monitor the situation inside the car via video and communicate with users inside. The detection unit can detect abnormal use of the car, thus promptly alerting maintenance personnel in the control room to potential elevator malfunctions or unexpected situations involving users. The detection unit can also detect deformation of the elevator shaft and can perform self-checks, thereby ensuring the normal operation of the elevator shaft and car.

Description

Technical Field

[0001] This invention relates to the field of elevator testing systems, and more specifically, to a safety testing system for elevators retrofitted into older residential communities. Background Technology

[0002] With the accelerating pace of urbanization, elevators have become an indispensable means of transportation in people's lives. Elevator safety detection systems are crucial equipment for ensuring user safety when riding elevators, serving as a vital guarantee for elevator safety, ensuring normal operation and safety, and protecting people's travel safety.

[0003] In the renovation of old residential communities, elevators are often installed in existing buildings to improve residents' quality of life and convenience. However, due to the unique structure of these communities and the limitations of construction in established old neighborhoods, many newly installed elevator shafts are modularly installed. Sections of the elevator shaft are manufactured in a factory and then transported to the site for installation. Because of the limitations of the community structure and construction conditions, newly installed elevators are more prone to safety hazards during use. These hazards mainly exist in two aspects: firstly, how to better monitor the situation inside the elevator and detect misuse; and secondly, the safety of the elevator's own structure, such as whether the elevator shaft deforms after prolonged use. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provide a safety detection system for the retrofitting of elevators in old residential communities.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an elevator detection system, comprising a control unit, a wireless communication unit, and a detection unit. The detection unit includes a housing portion, which includes a top plate, a bottom plate, a back plate connecting the top plate and the bottom plate, and a fixing block fixedly connected to and located below the bottom plate. An infrared human body sensing unit is installed at the fixing block. A temperature sensor, a humidity sensor, and a vibration sensor are installed at the top plate.

[0006] Furthermore, the fixing block has a recess and a mounting groove, the infrared human body sensing unit is installed in the mounting groove, a noise sensor is installed in the recess, a laser ranging unit is installed in the fixing block, and the laser ranging unit and the infrared human body sensing unit are located on both sides of the recess.

[0007] This allows for better detection of temperature, humidity, noise, and whether there are people inside the car.

[0008] Furthermore, the laser ranging unit is capable of detecting the distance from the laser ranging unit to the car door.

[0009] Furthermore, the wireless communication unit can use wireless communication technologies such as 4G / 5G and Wi-Fi to achieve remote transmission.

[0010] Furthermore, the detection system also includes an audible and visual alarm unit.

[0011] Furthermore, the detection system also includes a display screen unit installed inside the car.

[0012] This allows for information display through the display screen unit, enabling better interaction with community residents.

[0013] Furthermore, the display unit integrates a facial recognition unit, a fingerprint recognition unit, and an access card reading unit.

[0014] This allows for the identification of elevator users, making elevator use safer and the community environment safer.

[0015] Furthermore, the detection system also includes a video acquisition unit installed inside the car.

[0016] This allows the remote control room to better monitor the environment inside the car.

[0017] Furthermore, the detection system also includes a microphone unit and a speaker unit installed inside the car.

[0018] This allows the control room to interact with people inside the elevator car in an emergency.

[0019] Furthermore, the detection system also includes a velocity sensor and an acceleration sensor.

[0020] This allows for the monitoring of the car's speed and acceleration.

[0021] Furthermore, it also includes one or more calibration units, each calibration unit comprising two calibration sections; the top plate has a top groove, the bottom plate has a bottom through groove communicating with the groove, both the top groove and the bottom through groove have horizontal slide rails, the top groove has a top sliding plate, the bottom through groove has a bottom sliding plate, both the top and bottom sliding plates have horizontal grooves that mate with the horizontal slide rails, the top plate is equipped with a top motor and a top lead screw driven by the top motor, the top sliding plate has a top threaded hole that mates with the top lead screw; the bottom plate is equipped with a bottom motor and a bottom lead screw driven by the bottom motor, and so on. The bottom slide plate has a bottom threaded hole that mates with a bottom lead screw; a rotating shaft is installed between the top slide plate and the bottom slide plate, and a drive motor for driving the rotating shaft is installed at the bottom slide plate. A rotating part through which the rotating shaft passes is fixed at the rotating shaft. The rotating part has a first mounting surface, at which a first laser emitter and a light receiver located below the first laser emitter are mounted; the calibration part has a first upper reflecting surface, a first lower reflecting surface, and a first vertical surface connecting the first upper reflecting surface and the first lower reflecting surface. The angle between the first upper reflecting surface and the horizontal plane is 45 degrees, and the first upper reflecting surface and the first lower reflecting surface are perpendicular.

[0022] Furthermore, the light receiver comprises a rectangular photosensitive array.

[0023] This allows for a larger photosensitive area to receive light signals.

[0024] Furthermore, the two calibration sections in the same group are located at the same horizontal level and on opposite sides of the elevator shaft.

[0025] Furthermore, the housing is installed inside the car, and the calibration part is installed on the inner wall of the elevator shaft.

[0026] Furthermore, the car has glass material on both sides; the light from the first laser emitter can pass through the glass material and hit the calibration part.

[0027] Furthermore, the top lead screw is mounted in the top groove via two upper bearings.

[0028] Furthermore, the bottom lead screw is mounted in the bottom through groove via two lower bearings.

[0029] This allows the top and bottom slides to move synchronously, resulting in better translation of the rotating part.

[0030] Furthermore, a first semi-transparent mirror is installed on the first vertical surface, and the angle between the first semi-transparent mirror and the horizontal plane is 45 degrees.

[0031] Furthermore, two columns are connected between the top plate and the bottom plate. Each column has a second upper reflective surface, a second lower reflective surface, and a second vertical surface connecting the second upper reflective surface and the second lower reflective surface. The second upper reflective surface makes an angle of 45 degrees with the horizontal plane, and the second upper reflective surface and the second lower reflective surface are perpendicular.

[0032] Furthermore, a second semi-transparent mirror is installed on the second vertical surface, and the angle between the second semi-transparent mirror and the horizontal plane is 45 degrees.

[0033] Furthermore, the rotating part has a second mounting surface, on which a second laser emitter and a first light intensity sensor are mounted; the back of the back plate has a vertical groove, an upper through hole communicating with the vertical groove, and a lower through hole communicating with the vertical groove. An upper glass plate is mounted at the upper through hole, and a lower glass plate is mounted at the lower through hole. A reflector and a third semi-transparent mirror are mounted in the vertical groove. The angle between the reflector and the horizontal plane is 45 degrees. The reflector and the third semi-transparent mirror are perpendicular. A second light intensity sensor is mounted at the bottom of the vertical groove.

[0034] Furthermore, a surrounding sleeve is installed on the second mounting surface to enclose the first light intensity sensor.

[0035] This minimizes the impact of ambient light.

[0036] Furthermore, the calibration unit has multiple groups, and the multiple groups of calibration units are distributed in a row with equal spacing from top to bottom.

[0037] Furthermore, the top plate has an upper groove, in which the top motor is installed; the bottom plate has a lower groove, in which the bottom motor is installed.

[0038] Furthermore, the rotating shaft is connected to the top slide plate via a top bearing, and the rotating shaft is connected to the bottom slide plate via a bottom bearing; a motor frame is fixed at the bottom slide plate, and the drive motor is mounted on the motor frame.

[0039] Beneficial effects:

[0040] 1. The safety detection system of this application can simultaneously detect the safety of the elevator in use as well as the elevator's own operating condition and safety. It can detect parameters such as temperature, humidity, vibration, and noise inside the car, and can also detect the car's speed and acceleration.

[0041] 2. The safety detection system of this application allows the control room to monitor the situation inside the elevator car via video and communicate with the users inside the car. The detection unit can detect abnormal use of the car, thereby promptly alerting the maintenance personnel in the control room that the elevator may malfunction or that the user may encounter an accident, thus achieving better monitoring of the situation inside the elevator.

[0042] 3. The safety detection system of this application can also detect the deformation of the elevator shaft, and the detection unit can perform self-inspection, thereby ensuring the normal operation of the elevator shaft and car, and thus improving the safety of the elevator structure itself. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the detection system;

[0044] Figure 2 Schematic diagram of testing via calibration unit;

[0045] Figure 3 This is a magnified view of region A;

[0046] Figure 4 This is a magnified view of region B.

[0047] Figure 5 This is a magnified view of region C;

[0048] Figure 6 This is a magnified view of region D;

[0049] Figure 7 A diagram illustrating self-inspection using pillars;

[0050] Figure 8 A first-view diagram illustrating the detection of cleanliness of the upper and lower glass plates using a second laser emitter.

[0051] Figure 9 A second-view diagram illustrating the detection of cleanliness of the upper and lower glass plates using a second laser emitter.

[0052] Figure 2 , 8 In Figure 9, for the sake of simplicity, the distance between the calibration unit and the detection unit is relatively close. In reality, the distance from the detection unit to the calibration unit on one side is slightly greater than half the width of the car.

[0053] Explanation of reference numerals in the attached drawings: 1.1 Top plate; 1.1.1 Temperature sensor; 1.1.2 Humidity sensor; 1.1.3 Vibration sensor; 1.1.4 Upper groove; 1.2 Bottom plate; 1.2.1 Lower groove; 1.3 Back plate; 1.3.1 Vertical groove; 1.4 Fixing block; 1.4.1 Infrared human body sensing unit; 1.4.2 Noise sensor; 1.4.3 Laser ranging unit; 1.5 Column; 1.5.1 Second upper reflecting surface; 1.5.2 Second lower reflecting surface; 1.5.3 Second vertical surface; 1.5.4 Second semi-transparent mirror. 2. Calibration Unit; 2.1 First Upper Reflecting Surface; 2.2 First Lower Reflecting Surface; 2.3 First Vertical Surface; 2.4 First Semi-transparent Semi-reflective Mirror; 3.1 Top Slide Plate; 3.2 Bottom Slide Plate; 3.2.1 Motor Frame; 3.3 Top Lead Screw; 3.4 Bottom Lead Screw; 3.5 Drive Motor; 4. Rotating Unit; 4.1 First Laser Emitter; 4.2 Light Receiver; 4.3 Second Laser Emitter; 4.4 Enclosing Sleeve; 5.1 Reflector; 5.2 Third Semi-transparent Semi-reflective Mirror; 5.3 Second Light Intensity Sensor; 6.1 Upper Glass Plate; 6.2 Lower Glass Plate. Detailed Implementation

[0054] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0055] This invention provides, for example Figure 1-9 The system shown is a safety detection system for retrofitting elevators in old residential communities. It includes a control unit, a wireless communication unit, and a detection unit. The detection unit includes a housing, which includes a top plate 1.1, a bottom plate 1.2, a back plate 1.3 connecting the top plate and the bottom plate, and a fixing block 1.4 fixedly connected to the bottom plate 1.2 and located below the bottom plate 1.2. An infrared human body sensing unit 1.4.1 is installed at the fixing block 1.4. A temperature sensor 1.1.1, a humidity sensor 1.1.2, and a vibration sensor 1.1.3 are installed at the top plate 1.1.

[0056] The detection system also includes an audible and visual alarm unit, a display screen unit, a video acquisition unit, a microphone unit, a speaker unit, a speed sensor, and an acceleration sensor; the fixing block 1.4 has a groove and a mounting slot, the infrared human body sensing unit 1.4.1 is installed in the mounting slot, the noise sensor 1.4.2 is installed in the groove, and the laser ranging unit 1.4.3 is installed on the fixing block 1.4. The laser ranging unit 1.4.3 and the infrared human body sensing unit 1.4.1 are located on both sides of the groove.

[0057] The detection system further includes one or more calibration units, each calibration unit including two calibration parts 2; the top plate 1.1 has a top groove, the bottom plate 1.2 has a bottom through groove communicating with the groove, both the top groove and the bottom through groove have horizontal slide rails, the top groove has a top sliding plate 3.1, the bottom through groove has a bottom sliding plate 3.2, both the top sliding plate 3.1 and the bottom sliding plate 3.2 have horizontal slide grooves that cooperate with the horizontal slide rails, the top plate 1.1 is equipped with a top motor and a top lead screw 3.3 driven by the top motor, the top sliding plate 3.1 has a top threaded hole that cooperates with the top lead screw 3.3; the bottom plate 1.2 is equipped with a bottom motor and a bottom lead screw 3.4 driven by the bottom motor, the bottom sliding plate 3.2... The calibration part 2 has a bottom threaded hole that mates with the bottom lead screw 3.4; a rotating shaft is installed between the top slide plate 3.1 and the bottom slide plate 3.2, and a drive motor 3.5 for driving the rotating shaft is installed at the bottom slide plate 3.2. A rotating part 4 through which the rotating shaft passes is fixed at the rotating shaft. The rotating part 4 has a first mounting surface, at which a first laser emitter 4.1 and a light receiver 4.2 located below the first laser emitter 4.1 are installed; the calibration part 2 has a first upper reflecting surface 2.1, a first lower reflecting surface 2.2 and a first vertical surface 2.3 connecting the first upper reflecting surface 2.1 and the first lower reflecting surface 2.2. The first upper reflecting surface 2.1 has an angle of 45 degrees with the horizontal plane, and the first upper reflecting surface 2.1 and the first lower reflecting surface 2.2 are perpendicular.

[0058] A first semi-transparent mirror 2.4 is installed on the first vertical surface 2.3, and the angle between the first semi-transparent mirror 2.4 and the horizontal plane is 45 degrees. Two columns 1.5 are connected between the top plate 1.1 and the bottom plate 1.2. Each column 1.5 has a second upper reflective surface 1.5.1, a second lower reflective surface 1.5.2, and a second vertical surface 1.5.3 connecting the second upper reflective surface 1.5.1 and the second lower reflective surface 1.5.2. The angle between the second upper reflective surface 1.5.1 and the horizontal plane is 45 degrees, and the second upper reflective surface 1.5.1 and the second lower reflective surface 1.5.2 are perpendicular. A second semi-transparent mirror 1.5.4 is installed on the second vertical surface 1.5.3, and the angle between the second semi-transparent mirror 1.5.4 and the horizontal plane is 45 degrees.

[0059] The rotating part 4 has a second mounting surface, on which a second laser emitter 4.3 and a first light intensity sensor are mounted. The back of the back plate 1.3 has a vertical groove 1.3.1, an upper through hole communicating with the vertical groove 1.3.1, and a lower through hole communicating with the vertical groove 1.3.1. An upper glass plate 6.1 is mounted at the upper through hole, and a lower glass plate 6.2 is mounted at the lower through hole. A reflector 5.1 and a third semi-transparent mirror 5.2 are mounted inside the vertical groove 1.3.1. The reflector 5.1 has an angle of 45 degrees with the horizontal plane, and the reflector 5.1 and the third semi-transparent mirror 5.2 are perpendicular. A second light intensity sensor 5.3 is mounted at the bottom of the vertical groove 1.3.1.

[0060] A surrounding sleeve 4.4 is installed on the second mounting surface to enclose the first light intensity sensor; the calibration unit has multiple sets, which are distributed in a row at equal intervals from top to bottom; the top plate 1.1 has an upper groove 1.1.4, and the top motor is installed in the upper groove; the bottom plate 1.2 has a lower groove 1.2.1, and the bottom motor is installed in the lower groove; the rotating shaft is connected to the top slide plate 3.1 through a top bearing, and the rotating shaft is connected to the bottom slide plate 3.2 through a bottom bearing; a motor frame 3.2.1 is fixed at the bottom slide plate 3.2, and the drive motor 3.5 is installed at the motor frame 3.2.1.

[0061] Working principle: The safety detection system of this application can simultaneously detect the safety of the elevator in use as well as the elevator's own operating condition and safety. It can detect parameters such as temperature, humidity, vibration, and noise inside the elevator car. Furthermore, it can detect the car's speed and acceleration.

[0062] Furthermore, the control room can monitor the situation inside the elevator car via video and communicate with users inside. It can also detect abnormal car usage. For example, if it senses someone inside the car but the car hasn't moved for an extended period, it can automatically send an alarm to the remote control room, allowing maintenance personnel to review the monitoring footage and prevent elderly or sick people from fainting inside. Additionally, the laser ranging unit can detect whether the car doors are open. When the car doors are closed, the laser rangefinder's light signal is reflected by the car door, resulting in a smaller measurement value. When the car doors are open, the laser rangefinder's light signal passes through the opening, resulting in a larger measurement value. When the laser rangefinder detects the car doors opening repeatedly within a short period, it can alert maintenance personnel in the control room that the elevator may be malfunctioning. This judgment of abnormal car door opening is independent of the car door drive system, making the judgment more accurate and providing better independence.

[0063] In addition to the above-mentioned detection, the detection unit can also detect the deformation of the elevator shaft (using a car with glass sidewalls). During installation, the detection unit of this application is installed on the inner sidewall of the car facing the car door (preferably in a higher position). Then, for each floor, a set of calibration units is installed at the elevator shaft. After installation, a test is performed. By rotating and translating the rotating part, the rotating part is ensured to be in a certain position (the control unit stores this position information). The light from the first laser emitter passes through the car, is reflected by the first reflective surface, then reflected by the second reflective surface, and then receives the light from the light receiver after passing through the car (by marking the surface calibration part; otherwise, the position of the calibration part is adjusted until the standard is met). After installation, in subsequent elevator shaft inspections, when the elevator reaches a floor, the control unit controls the rotating part to move to the above-mentioned position information. If the light receiver can receive the light signal normally, and the position deviation of the light signal on the light receiver is within a predetermined range, it indicates that the elevator shaft and car are operating normally; otherwise, it indicates that there is excessive deformation, which may be abnormal. The purpose of setting up the first semi-transparent and semi-reflective mirror is that, when light passes through it, part of it is reflected by the first lower reflecting surface and strikes the lower area of ​​the light receiver, while the other part is directly reflected by the mirror and strikes the upper area of ​​the receiver, thus obtaining two light spots. By comparing the two light spots, the judgment result is more accurate. This detection can be performed periodically.

[0064] In addition, to ensure that the detection unit itself is functioning correctly during testing, two columns are installed. The rotating part can rotate, allowing the light from the first laser emitter to be reflected by the second upper reflective surface. Part of the light passes through the second semi-transparent mirror and is reflected by the second lower reflective surface, striking the light receiver. The other part is reflected by the second semi-transparent mirror and strikes the light receiver, thus determining that the detection unit itself is not abnormal. Since this self-test step is only related to the detection unit itself and is unrelated to the car and elevator shaft, it is used for self-checking. A self-test is performed before each elevator shaft test. After the self-test shows no abnormalities (indicating that the control accuracy of each motor and the mechanism of the detection unit itself are normal), the elevator shaft test is then performed.

[0065] Furthermore, with elevator use, dust accumulates on the glass surfaces (some communities maintain them well and wipe the glass regularly, while others maintain them poorly, and because the detection unit is located at a high position, cleaning staff may not wipe the higher areas of the car frequently, and the outer walls of the car are cleaned even less frequently), which may affect the detection. Therefore, the detection unit is equipped with upper and lower glass panels (the upper and lower glass panels will not be wiped) to simulate the extreme case of no wiping, and the dust adhesion on the glass side walls inside the car (mainly floating dust, with the dust adhesion on the upper and lower glass panels representing the dust adhesion on the car side walls). The light from the second laser generator is reflected by the reflector on the upper glass panel and then passes through the third semi-transparent mirror. Part of the light is directly detected by the second light intensity sensor, and the other part passes through the lower glass panel and is detected by the first light intensity sensor. The degree of light loss by the upper and lower glass panels is used to determine the dust adhesion. Since the first light intensity sensor is located inside the enclosure and the second light intensity sensor is located at the bottom of the vertical groove, the influence of ambient light can be minimized. If the test results indicate that there is a lot of dust adhering to the glass, notify the personnel in the control room to forcibly clean the glass panel of the car to avoid affecting the subsequent testing operations of the testing system.

[0066] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.

Claims

1. A safety detection system for retrofitting elevators in old residential communities, characterized in that, The system includes a control unit, a wireless communication unit, a detection unit, and one or more calibration units. Each detection unit includes a housing, which comprises a top plate, a bottom plate, a back plate connecting the top and bottom plates, and a fixing block fixedly connected to and located below the bottom plate. An infrared human body sensing unit is installed at the fixing block. A temperature sensor, a humidity sensor, and a vibration sensor are installed at the top plate. Each calibration unit includes two calibration sections. The top plate has a top groove, and the bottom plate has a bottom through groove communicating with the groove. Both the top groove and the bottom through groove have horizontal slide rails. The top groove has a top sliding plate, and the bottom through groove has a bottom sliding plate. Both the top and bottom sliding plates have horizontal grooves that mate with horizontal slide rails. A top motor and a top lead screw driven by the top motor are mounted on the top plate, and the top sliding plate has a top threaded hole that mates with the top lead screw. A bottom motor and a bottom lead screw driven by the bottom motor are mounted on the bottom plate, and the bottom sliding plate has a bottom threaded hole that mates with the bottom lead screw. A rotating shaft is installed between the top and bottom sliding plates, and a drive motor for driving the rotating shaft is mounted on the bottom sliding plate. A rotating part through which the rotating shaft passes is fixed at the rotating shaft, and the rotating part has a first mounting surface. A first laser emitter and a part located below the first laser emitter are mounted on the first mounting surface. A square light receiver; the calibration unit has a first upper reflective surface, a first lower reflective surface, and a first vertical surface connecting the first upper reflective surface and the first lower reflective surface. The first upper reflective surface makes an angle of 45 degrees with the horizontal plane, and the first upper reflective surface and the first lower reflective surface are perpendicular. A first semi-transparent mirror is installed on the first vertical surface, and the first semi-transparent mirror makes an angle of 45 degrees with the horizontal plane. Two columns are connected between the top plate and the bottom plate. Each column has a second upper reflective surface, a second lower reflective surface, and a second vertical surface connecting the second upper reflective surface and the second lower reflective surface. The second upper reflective surface makes an angle of 45 degrees with the horizontal plane, and the second upper reflective surface and the second lower reflective surface... The lower reflective surface is vertical; a second semi-transparent mirror is installed on the second vertical surface, and the angle between the second semi-transparent mirror and the horizontal plane is 45 degrees; the rotating part has a second mounting surface, and a second laser emitter and a first light intensity sensor are installed on the second mounting surface; the back of the back plate has a vertical groove, an upper through hole communicating with the vertical groove, and a lower through hole communicating with the vertical groove, an upper glass plate is installed at the upper through hole, a lower glass plate is installed at the lower through hole, a reflector and a third semi-transparent mirror are installed in the vertical groove, the angle between the reflector and the horizontal plane is 45 degrees, the reflector and the third semi-transparent mirror are perpendicular, and a second light intensity sensor is installed at the bottom of the vertical groove.

2. The safety detection system for retrofitting elevators in old residential communities according to claim 1, characterized in that, It also includes an audible and visual alarm unit, a display screen unit, a video acquisition unit, a microphone unit, a speaker unit, a speed sensor, and an acceleration sensor.

3. The safety detection system for retrofitting elevators in old residential communities according to claim 1, characterized in that, The fixing block has a recessed portion and a mounting groove. The infrared human body sensing unit is installed in the mounting groove. A noise sensor is installed in the recessed portion. A laser ranging unit is installed at the fixing block. The laser ranging unit and the infrared human body sensing unit are located on both sides of the recessed portion.

4. The safety detection system for retrofitting elevators in old residential communities according to claim 1, characterized in that, A surrounding sleeve is installed on the second mounting surface to enclose the first light intensity sensor; the calibration unit has multiple sets, and the multiple sets of calibration units are distributed in a row with equal spacing from top to bottom.

5. The safety detection system for retrofitting elevators in old residential communities according to claim 1, characterized in that, The top plate has an upper groove, in which the top motor is installed; the bottom plate has a lower groove, in which the bottom motor is installed.

6. The safety detection system for retrofitting elevators in old residential communities according to claim 1, characterized in that, The rotating shaft is connected to the top slide plate via a top bearing, and the rotating shaft is connected to the bottom slide plate via a bottom bearing; a motor frame is fixed at the bottom slide plate, and the drive motor is mounted on the motor frame.

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