An elevator position measurement system based on master-slave photoelectric detection

Abstract

The utility model discloses a kind of elevator position measurement systems based on master-slave photoelectric detection, including measuring scale and APS detector, at least one code channel is provided on measuring scale, corresponding measuring hole is provided on each code channel, the measuring scale is installed in elevator shaft along elevator movement direction, the APS detector is installed at one end of elevator close to code channel, the APS detector is provided with two groups of detection mechanism corresponding each code channel, each group of detection mechanism includes a light emitting element emitting light beam from the one end of measuring scale to the corresponding code channel of measuring scale and a photosensitive element detecting whether light beam can pass through code channel measuring hole at the other end of measuring scale, and the safety performance is high;If system is restarted after power failure, real-time position can be quickly acquired through APS, immediately automatically restore normal, improve the safety of elevator;Increase the efficiency of elevator installation and debugging;Only need to install position scale and APS detector can self-learning, without layer-by-layer artificial positioning.

Description

Technical Field

[0001] This utility model relates to the field of measurement equipment technology, specifically to an elevator position measurement system based on master-slave photoelectric detection. Background Technology

[0002] Currently, mainstream elevator positioning systems primarily rely on two types of devices: photoelectric encoders and limit switches. Photoelectric encoders are installed on the elevator motor shaft to sense the motor's movement and formulate corresponding operating plans, ensuring precise elevator operation and stopping at designated locations. Limit switches, on the other hand, are installed inside the elevator car or shaft to detect whether the elevator car exceeds its restricted movement range, ensuring safe elevator operation.

[0003] The aforementioned mainstream positioning system technologies have undergone a long period of market testing and possess advantages such as technological maturity and high reliability. However, some problems still exist, such as: (1) high cost, requiring the installation of limit switches and other equipment on each floor; (2) difficult installation and debugging, time-consuming, requiring floor-by-floor positioning during elevator installation; (3) complex system, with a high failure rate; and (4) difficulty in handling emergencies. If the system is restarted after a power outage, the elevator system will not be able to find the car's position. Only after elevator maintenance personnel reset the system, allowing the car to return to the elevator shaft base (such as -1 floor), and re-leveling and positioning it floor by floor, can the elevator resume normal operation. Summary of the Invention

[0004] Purpose of the utility model: To overcome the problems existing in the prior art, this utility model provides an elevator position measurement system based on master-slave photoelectric detection, which has high safety performance. If the system restarts after a power outage, it can quickly obtain the real-time position through the APS (Automatic Positioning System) and immediately and automatically return to normal, thus improving the safety of the elevator. It also increases the efficiency of elevator installation and commissioning. It only requires the installation of a position ruler and an APS detector to learn itself, eliminating the need for manual positioning floor by floor.

[0005] To solve the above problems, the present invention adopts the following technical solution: An elevator position measurement system based on master-slave photoelectric detection includes a measuring ruler and an APS detector. The measuring ruler has at least one code track, and each code track has a corresponding measuring hole. The measuring ruler is installed in the elevator shaft along the elevator's movement direction and away from the elevator's main door. The APS detector is installed at one end of the elevator shaft near the code track. The APS detector has at least one set of detection mechanisms for each code track. Each set of detection mechanisms includes a light-emitting element that emits a light beam from one end of the measuring ruler to the corresponding code track and a photosensitive element that detects whether the light beam can pass through the measuring hole of the code track at the other end of the measuring ruler.

[0006] Preferably, the APS detector is equipped with two sets of detection mechanisms for each code channel.

[0007] Preferably, the APS detector is provided with a mounting slot through which the measuring ruler passes.

[0008] Preferably, the mounting groove is a ring structure or a U-shaped structure with one end open, and the light-emitting element and the photosensitive element are arranged on opposite sides of the mounting groove.

[0009] Preferably, the measuring ruler 1 is provided with spring hooks at both ends, and the elevator shaft is provided with hook fixing seats corresponding to the spring hooks.

[0010] Preferably, the hook fixing seat includes a plurality of hanging holes arranged from the direction closer to the elevator to the direction farther away from the elevator.

[0011] Preferably, the code track is provided with two or more, and the measurement accuracy corresponding to different code tracks is different.

[0012] Preferably, the code track is provided with two tracks, including a high-precision code track and a normal code track.

[0013] Preferably, the measurement range of the ordinary code track is the elevator movement height, with an accuracy of L; the measurement range of the high-precision code track is L, with an accuracy of L / 6, where L≥1mm.

[0014] Preferably, L = 6mm.

[0015] Preferably, the measuring hole is a round hole, a polygonal hole, an elliptical hole, a heart-shaped hole, or an irregularly shaped hole.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following advantages: 1. High safety performance; if the system restarts after a power outage, the real-time position can be quickly obtained through the APS, and it will automatically return to normal immediately, improving the safety of the elevator; it increases the efficiency of elevator installation and commissioning; it can learn on its own by simply installing a position ruler and an APS detector, without the need for manual positioning floor by floor.

[0017] 2. Low manufacturing cost: Position rulers and APS measuring rulers are less expensive than traditional positioning systems; strong expandability: the real-time position of the elevator is transmitted via CAN bus, which is conducive to the further development of intelligent elevators; low requirements for the operating environment; long measurement range: it can measure hundreds of meters; long service life and easy maintenance. Attached Figure Description

[0018] Figure 1 This is a perspective view of the first embodiment of the present utility model; Figure 2 This is a schematic diagram of the installation of the measuring ruler according to the first embodiment of this utility model; Figure 3This is a schematic diagram of the detector position in the first embodiment of this utility model; Figure 4 This is a schematic diagram of the detector position according to the second embodiment of this utility model; Figure 5 This is a schematic diagram of the code track of this utility model; Figure 6 This is a flowchart illustrating the principle of the coding of this utility model; Figure 7 This is a schematic diagram of the operation of the two sets of detection mechanisms (master and slave) of this utility model. Figure 1 ; Figure 8 This is a schematic diagram of the operation of the two sets of detection mechanisms (master and slave) of this utility model. Figure 2 ; Explanation of reference numerals in the attached figures: 1. Measuring ruler; 2. Detector; 21. Mounting slot; 3. Code track; 31. Ordinary code track; 32. High-precision code track; 5. Elevator shaft; 6. Spring hook; 7. Hook fixing seat; 8. Hanging hole. Detailed Implementation

[0019] All features disclosed in this specification, or steps in all methods or processes disclosed herein, may be combined in any way, except for mutually exclusive features and / or steps.

[0020] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0022] like Figure 1-3 As shown, in the first embodiment of this utility model, an elevator position measurement system based on master-slave photoelectric detection includes a measuring ruler 1 and an APS detector 2. The measuring ruler 1 is provided with at least one code track 3, and each code track 3 is provided with a corresponding measuring hole. The measuring ruler 1 is installed in the elevator shaft 5 along the elevator movement direction and avoiding the elevator door. The APS detector 2 is installed at one end of the elevator near the code track 3. The APS detector 2 is provided with at least one set of detection mechanisms for each code track 3. Each set of detection mechanisms includes a light-emitting element that emits a light beam from one end of the measuring ruler 1 to the corresponding code track 3 of the measuring ruler 1 and a photosensitive element that detects whether the light beam can pass through the measuring hole of the code track 3 at the other end of the measuring ruler 1.

[0023] In this embodiment, the APS detector 2 is equipped with two sets of detection mechanisms for each code track 3.

[0024] In this embodiment, the APS detector 2 is provided with a mounting slot 21 through which the measuring ruler 1 passes.

[0025] In this embodiment, the mounting groove 21 is an annular structure, and the light-emitting element and the photosensitive element are disposed on opposite sides of the mounting groove 21.

[0026] In this embodiment, spring hooks 6 are provided at both ends of the measuring ruler 1, and hook fixing seats 7 are provided in the elevator shaft 5 corresponding to the spring hooks 6.

[0027] In this embodiment, the hook fixing seat 7 includes a plurality of hanging holes 8 arranged from the direction closer to the elevator to the direction farther away from the elevator.

[0028] The structure of the spring hook 6 is combined with the ring structure of the mounting groove 21. The measuring ruler 1 is first installed at the top of the shaft through the hanging hole 8, so that it hangs down naturally. The bottom of the shaft is equipped with a spring. The elasticity of the spring makes it easier to install the measuring ruler 1, increases the fault tolerance of the installation, and prevents the measuring ruler 1 from curling.

[0029] The structure with multiple hanging holes 8 makes it easy to adjust the position of the measuring ruler 1 during installation, so that the measuring ruler 1 can be installed in the optimal position to work with the APS detector 2.

[0030] like Figure 5 As shown, in this embodiment, the code track 3 is provided with two tracks, including a high-precision code track 32 and a normal code track 31. The normal code track 31 is composed of continuous displacement codes, and the high-precision code track 32 is composed of small holes with equal spacing of L. The specific working principle of the high-precision code track 32 and the normal code track 31 will be described in detail later. The specific spacing of the channels can be adjusted according to the accuracy requirements of different measurement systems.

[0031] In this embodiment, the measurement range of the ordinary code track 31 is the elevator movement height, and the accuracy is L; the measurement range of the high-precision code track 32 is L, and the accuracy is L / 6, where L = 6mm. The accuracy refers to the distance that the APS detector 2 moves within the time interval between two adjacent measurements.

[0032] In this embodiment, the APS detector 2 is fixed to the top of the elevator car with screws and an iron plate. The measuring ruler is positioned to avoid the elevator door and can be installed on the back or sides depending on the actual situation. The APS detector is set to correspond to the position of the measuring ruler.

[0033] Working Principle: The APS detector 2 is designed with a mounting slot 21 through which the measuring scale 1 passes. The APS detector 2 uses multiple light-emitting elements and photosensitive elements to scan the measuring scale 1. Depending on whether the light beam can pass through the aperture of the measuring scale 1, the photosensitive elements will return different level signals. These level signals are combined and compared with the code track 3 data stored in the APS detector 2 to obtain the current position information. This position information is then processed by the code logic in the chip and fed back via the CAN bus. The APS detector 2 is fixed to the side of the elevator car top with screws and a metal plate, and is powered by the elevator control cabinet on the top of the car, feeding back the detected position information to the control cabinet. As the elevator car moves up and down, the APS detector 2 also moves vertically up and down, detecting the code track 3 information of the measuring scale 1.

[0034] By using two code tracks 3 in combination, a wide measurement range and high measurement accuracy can be achieved simultaneously. For example, in an elevator system, if the bottom of the car is taken as the zero position, when the elevator is going up, the approximate position S1 of the car is obtained by scanning the ordinary code track 31. The actual position of the car is between S1 and S1+6mm. Then, the distance S2 of the car's deviation from the standard code track is obtained by scanning the high-precision code track 32 (S2 is positive when the elevator is going up and negative when it is going down). Therefore, the precise position of the car is S1+S2. When the elevator is going down, the same scanning method is used. The approximate position S1 of the car is obtained by scanning the ordinary code track 31. The actual position of the car is between S1-6mm and S1. Then, the distance S2 of the car's deviation from the standard code track 3 is obtained by scanning the high-precision code track 32. Therefore, the precise position of the car is S1+S2 (S2 is negative at this time). The measurement range of hundreds of meters and the measurement accuracy of 1mm can meet the requirements of most elevators.

[0035] like Figure 4 As shown, in the second embodiment of this utility model, the U-shaped structure with one end of the mounting groove 21 is open, and the light-emitting element and the photosensitive element are set on two opposite plates of the mounting groove 21. With this structure, when installing the measuring ruler 1, the measuring ruler 1 can be fixedly installed at a position outside the mounting groove 21, for example, directly fixed on the side wall of the elevator shaft 5 by a screw.

[0036] In the above embodiments, the measuring hole can be a round hole, a polygonal hole, an elliptical hole, a heart-shaped hole, or an irregularly shaped hole.

[0037] The generation scheme and principle of measuring track 3 of scale 1 are as follows: Ordinary code channel 31 consists of shift-continuous codes, a special encoding method where each subsequent code can be considered as its predecessor shifted one bit and then padded with a "1" or "0". This encoding method consists of 0 and 1 bits, and the code length is n bits. The principle of shift-continuous codes is that, through this specific encoding rule, continuous changes between codes can be achieved; that is, any code can be converted into the next code through simple shift and padding operations, and vice versa. An n-bit code can generate 2^n shift-continuous codes, which can be expanded according to different measurement distance requirements. Its specific generation rules are as follows... Figure 6 As shown.

[0038] Taking a 4-bit shifted consecutive code as an example, the unique consecutive codes generated according to the above algorithm are shown in the table below: The high-precision code track 32 of the measuring ruler 1 is composed of small holes with equal spacing of L.

[0039] APS detector 2 has a total of 4 detectors, forming two detection mechanisms: master and slave.

[0040] The four detector groups are A1, A2, B1, and B2. Among them, A1 and A2 are the master detectors, and B1 and B2 are the slave detectors.

[0041] Groups A1 and B1 detect the ordinary code track 31 to obtain the approximate position S1, while groups A2 and B2 detect the high-precision code track 32 to obtain the precise deviation value S2. The precise distance S1+S2 can then be obtained.

[0042] The master and slave devices work together to increase the system's fault tolerance and obtain the most accurate location.

[0043] Because the APS detector 2 moves continuously, the aperture and photodetector may not be perfectly aligned. When the photodetector moves to a certain position, the result obtained by the photodetector is not very accurate. Therefore, the master and slave units need to cooperate with each other, and the detection result of the ordinary code channel 31 of the master / slave unit should be adopted based on the detection result of the high-precision code channel 32. An example is given below: like Figure 7 As shown: the large hole at the bottom is the standard code track 31, and the small hole at the top is the high-precision code track 32. The rectangle represents the photodetector of the master unit, and the ellipse represents the photodetector of the slave unit. The rectangle and ellipse in the figure are only for easy distinction. In practice, the same detection mode is generally used, for example, both are rectangles.

[0044] Taking the host (rectangular) as an example, the APS detector 2 moves a distance of L / 6 each time, which is exactly 6 cycles for the high-precision code track 32. When the A2 group detector 2 detects such... Figure 7In the three positions shown, detector A1 is precisely aligned with the large aperture channel, and the position information obtained from detecting the large aperture is the most accurate and is adopted. However, detector B1 (elliptical) of the slave device will detect part of the aperture edge, and most of the beam cannot pass through the aperture, so the position information obtained is not adopted.

[0045] When APS detector 2 moves again, as Figure 8 As shown: At this point, the B1 group detector of the slave device (elliptical) is precisely aligned with the large aperture channel, and the position information obtained from detecting the large aperture is the most accurate and is adopted. However, the A1 group detector of the master device (rectangular) will detect part of the aperture edge, and most of the beam cannot pass through the aperture channel, so the position information obtained is not adopted.

[0046] The six states form a cycle. The information of ordinary code track 31 is obtained by detecting the master or slave device in sequence. Then, the position data of high-precision code track 32 is used to obtain the most accurate position information.

[0047] The method of using two code tracks 3 in combination is superior to the traditional single-code track measurement method. Using a single code track 3 results in densely packed perforations on the measuring scale 1, increasing perforation costs and reducing the strength of the measuring scale 1, making it prone to breakage. Furthermore, the dense perforations on a single code track 3 require a reduced distance between the corresponding photoelectric emitters, leading to closer beam distances. Adjacent beams may interfere with each other, affecting the accuracy of the code track 3 detection results and significantly increasing the probability of errors during detection.

[0048] In the dual-channel 3-way detection method, the high-precision channel 32 has a simple and regular drilling pattern, which greatly saves drilling costs. Furthermore, due to the large distance between adjacent channels, the impact on the strength of the measuring ruler 1 is minimal, and adjacent photoelectric detectors do not interfere with each other. This is far superior to the traditional single-channel 3-way detection method.

[0049] The light-emitting unit in APS detector 2 periodically sends signals. If the light-emitting signal can pass through the hole in measuring scale 1, the photosensitive unit receives the signal and feeds back a level signal of 1. If the light-emitting signal cannot pass through the hole in measuring scale 1, the photosensitive unit does not receive the signal and feeds back a level signal of 2. Different level signals represent 1 and 0. After multiple sets of level signals are combined, APS detector 2 processes them to obtain the position. The specific processing logic is as follows: First, detect the high-precision code channel 32. If the information detected by the high-precision code channel 32 is 101, convert it to hexadecimal to get 0x05. At this time, it means that the position offset value is 1, and the detection data of the ordinary code channel 31 is valid.

[0050] For example, if the information for code channel 3 obtained from ordinary code channel 31 is 1011 0000 0000 0001, converting it to hexadecimal gives 0xB001. Comparing this with the code channel 3 data in the Flash memory of APS detector 2, the position information corresponding to 0xB001 can be found to be 534. This means that the approximate position of APS detector 2 is 534 * 6 = 3204 mm. Furthermore, combined with the information from ordinary code channel 31, we can determine that the precise position of APS detector 2 at this time is 534 * 6 + 1 = 3205 mm.

[0051] After obtaining the location information, the code logic of the APS detector 2 chip processes the location information and sends it back via the CAN bus.

[0052] The purpose of the above embodiments is to reproduce and derive the technical solution of this utility model by way of example, and to fully describe the technical solution, purpose and effect of this utility model. The purpose is to enable the public to have a more thorough and comprehensive understanding of the disclosed content of this utility model, and it is not intended to limit the protection scope of this utility model.

[0053] The above embodiments are not an exhaustive list based on the present invention, and there may be other embodiments not listed. Any substitutions and improvements made without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. An elevator position measurement system based on master-slave photoelectric detection, characterized in that: The system includes a measuring ruler (1) and an APS detector (2). The measuring ruler (1) has at least one code track (3), and each code track (3) has a corresponding measuring hole. The measuring ruler (1) is installed in the elevator shaft (5) along the direction of elevator movement and away from the elevator door. The APS detector (2) is installed at one end of the elevator near the code track (3). The APS detector (2) has at least one set of detection mechanisms for each code track (3). Each set of detection mechanisms includes a light-emitting element that emits a light beam from one end of the measuring ruler (1) to the corresponding code track (3) of the measuring ruler (1) and a photosensitive element that detects whether the light beam can pass through the measuring hole of the code track (3) at the other end of the measuring ruler (1).

2. The elevator position measurement system based on master-slave photoelectric detection according to claim 1, characterized in that: The APS detector (2) is equipped with two sets of detection mechanisms for each code channel (3).

3. The elevator position measurement system based on master-slave photoelectric detection according to claim 1, characterized in that: The APS detector (2) is provided with a mounting slot (21) through which the measuring ruler (1) passes.

4. The elevator position measurement system based on master-slave photoelectric detection according to claim 3, characterized in that: The mounting groove (21) is a ring structure or a U-shaped structure with one end open, and the light-emitting element and the photosensitive element are arranged on opposite sides of the mounting groove (21).

5. The elevator position measurement system based on master-slave photoelectric detection according to claim 1, characterized in that: The measuring ruler (1) is provided with spring hooks (6) at both ends, and the elevator shaft (5) is provided with hook fixing seats (7) corresponding to the spring hooks (6).

6. The elevator position measurement system based on master-slave photoelectric detection according to claim 5, characterized in that: The hook fixing seat (7) includes multiple hanging holes (8) arranged from the direction closer to the elevator to the direction farther away from the elevator.

7. The elevator position measurement system based on master-slave photoelectric detection according to claim 1, characterized in that: The code track (3) has two or more tracks, and the measurement accuracy is different for different code tracks (3).

8. An elevator position measurement system based on master-slave photoelectric detection according to claim 1 or 6, characterized in that: The code track (3) has two tracks, including a high-precision code track (32) and a normal code track (31).

9. The elevator position measurement system based on master-slave photoelectric detection according to claim 8, characterized in that: The measurement range of the ordinary code track (31) is the elevator movement height, and the accuracy is L; the measurement range of the high-precision code track (32) is L, and the accuracy is L / 6, where L≥1mm.

10. The elevator position measurement system based on master-slave photoelectric detection according to claim 1, characterized in that: The measuring hole can be a round hole, a polygonal hole, an elliptical hole, a heart-shaped hole, or an irregularly shaped hole.

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