Elevator light curtain blind spot detection device and detection method

Abstract

The present invention relates to the technical field of elevator light curtains, and specifically to an elevator light curtain blind spot detection device and detection method, wherein the detection device comprises a frame, a TX end bracket, an RX end bracket, a light curtain TX end, a light curtain RX end, a first moving mechanism, a second moving mechanism, a third moving mechanism, an obstruction, and a control box. The present invention moves the obstruction in the detection area, and measures whether there is no obstruction through the feedback of the light curtain RX end. Compared with the detection method of repeatedly entering the detection area vertically, the detection efficiency is faster, and the position is not missed, and the blind spot reappearance function can be more intuitively displayed. The blind spot position can be repeatedly verified, so the present invention has higher detection efficiency and higher reliability. The sensor is used for regular calibration to improve the reliability of the detection. The present invention can also simulate various errors of the light curtain in actual work due to installation by adjusting the mechanism to improve the authenticity of the detection.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator light curtains, and in particular to an elevator light curtain blind spot detection device and a detection method. Background Art

[0002] Elevator light curtain is an elevator door safety protection device made by photoelectric induction principle, which is used to protect the safety of people and objects entering and leaving the elevator. The door closing protection device generally uses an infrared light curtain, which is composed of a transmitting component and a receiving component. The transmitting end transmits an infrared beam to the receiving end to receive the infrared beam. According to 5.3.6.2.2.1 of GB / T 7588.1-2020:

[0003] 1. The protective device (such as light curtain) can at least cover the area 25mm to 1600mm above the car sill.

[0004] 2. The protection device should be able to detect obstacles with a diameter of not less than 50mm.

[0005] Our company applied for an invention patent CN117092719B in 2023. An elevator light curtain reliability test device and test method utilizes the first moving mechanism and the second moving mechanism to change the position of the obstruction, and the reciprocating moving mechanism controls the extension and retraction of the obstruction, which continuously enters / leaves the detection plane of the light curtain. One reciprocating movement is recorded as one action. Whether the light curtain detects that it is blocked, millions of measurements are performed to detect the reliability of the light curtain.

[0006] In addition to testing the reliability of elevator light curtains, factory sampling tests often also require testing blind spots. Although blind spot tests can be performed in the above patent, each entry and exit of the obstruction is counted as a test, and each entry and exit takes several seconds, so the efficiency in testing blind spots is low and needs to be improved. Summary of the invention

[0007] The problem solved by the invention is that the efficiency of detecting blind spots of light curtains in the prior art is low, and a device and a method for detecting blind spots of elevator light curtains are provided.

[0008] The present invention is implemented through the following technical solution: an elevator light curtain blind spot detection device, comprising a frame;

[0009] The frame is provided with two vertical mounting surfaces, including a first mounting surface and a second mounting surface;

[0010] The first mounting surface is provided with a TX end bracket and an RX end bracket, at least one of the TX end bracket and the RX end bracket is slidably mounted on the first mounting surface and driven to move by a first moving mechanism, and the first moving mechanism is provided with two first horizontal limit sensors for limiting its left and right extreme positions;

[0011] The TX end bracket is mounted with the light curtain TX end through a first clamping mechanism;

[0012] The RX end bracket is mounted with the light curtain RX end through a second clamping mechanism;

[0013] The plane where the light curtain TX end and the light curtain RX end are located is the detection plane, and the rectangular plane area between the light curtain TX end and the light curtain RX end is the detection area;

[0014] The second mounting surface is provided with a second moving mechanism for horizontal movement, a third moving mechanism for vertical movement, and a shielding object. The second moving mechanism is installed on the second plane. The second moving mechanism is provided with two second horizontal limit sensors for limiting its left and right extreme positions. The third moving mechanism is installed at the movable end of the second moving mechanism. The shielding object is installed at the movable end of the third moving mechanism. The length direction of the shielding object is perpendicular to the detection plane, and the shielding object and the detection plane intersect.

[0015] The first moving mechanism, the second moving mechanism and the third moving mechanism all have position control and position feedback functions;

[0016] The third moving mechanism is provided with an upper limit sensor and a lower limit sensor. When the upper limit sensor or the lower limit sensor has a signal, the obstruction is respectively located at the upper edge and the lower edge of the detection area. The third moving mechanism is also provided with at least one of an upper upper limit sensor and a lower lower limit sensor. The upper upper limit sensor and the lower lower limit sensor are located outside the detection area.

[0017] A control box is installed on the frame, a button and a control panel are arranged on the shell of the control box, a control unit is arranged in the control box, and the light curtain TX end, the light curtain RX end, the first moving mechanism, the second moving mechanism, and the sensor uniformity control unit are electrically connected.

[0018] Furthermore, in order to simulate the actual installation state of the light curtain, one or more of the following adjustment mechanisms are installed on the TX end bracket and the RX end bracket:

[0019] A vertical tolerance adjustment mechanism capable of adjusting the up and down position of one end of the light curtain;

[0020] A horizontal tolerance adjustment mechanism capable of adjusting the horizontal position of one end of the light curtain;

[0021] A transverse allowable angle adjustment mechanism capable of adjusting the longitudinal angle of one end of the light curtain;

[0022] A longitudinal allowable angle difference adjustment mechanism capable of adjusting the longitudinal angle of one end of the light curtain;

[0023] When multiple adjustment mechanisms are installed on any one of the TX-end bracket and the RX-end bracket, the structures of the multiple adjustment mechanisms are superimposed in sequence.

[0024] Furthermore, a transverse allowable angle difference adjustment mechanism is installed on the TX end bracket, a longitudinal allowable angle difference adjustment mechanism is installed on the movable end of the transverse allowable angle difference adjustment mechanism, and the first clamping mechanism is installed on the movable end of the longitudinal allowable angle difference adjustment mechanism;

[0025] The RX end bracket is provided with a horizontal tolerance adjustment mechanism, the movable end of the horizontal tolerance adjustment mechanism is provided with a vertical tolerance adjustment mechanism, and the second clamping mechanism is provided with the movable end of the vertical tolerance adjustment mechanism.

[0026] Furthermore, the TX end bracket includes a first upper connecting plate, a first lower connecting plate, and a first connecting column which are fixedly connected in sequence, the first upper connecting plate and the first lower connecting plate are both slidably mounted on the first mounting surface, and the movable end of the first moving mechanism is fixedly connected to the first upper connecting plate.

[0027] The lateral allowable angle difference adjustment mechanism comprises a first upper top plate, a first lower bottom plate, a second connecting column and a first driving mechanism. The first upper top plate and the first lower bottom plate are rotatably connected to the first upper connecting plate and the first lower connecting plate respectively, and are driven to rotate by the first driving mechanism.

[0028] The longitudinal allowable angle difference adjustment mechanism includes a swing column, a horizontal rotating shaft and a second driving mechanism. The swing column is set at the middle position of the second connecting column through the horizontal rotating shaft and is driven to swing by the second driving mechanism. The horizontal rotating shaft is perpendicular to the detection plane. The first clamping mechanism is installed on the swing column.

[0029] Further, the RX end bracket includes a second upper connecting plate and a second lower connecting plate, and the second upper connecting plate and the second lower connecting plate are respectively fixedly mounted on the upper and lower ends of the first mounting surface.

[0030] The horizontal tolerance adjustment mechanism includes a horizontal moving column and a third driving mechanism. The upper and lower ends of the horizontal moving column are slidably connected to the second upper connecting plate and the second lower connecting plate through a track and a slider, and are driven to slide by the second driving mechanism. The sliding direction is perpendicular to the detection plane.

[0031] The vertical tolerance adjustment mechanism comprises a vertical movable column and a fourth driving mechanism. The vertical movable column is slidably arranged on the horizontal movable column and driven to slide by the fourth driving mechanism. The second clamping mechanism is installed on the vertical movable column.

[0032] Furthermore, the first moving mechanism, the second moving mechanism, and the third moving mechanism are one of a ball screw linear module, a synchronous belt linear module, a belt linear module, and a gear transmission linear module.

[0033] Another aspect of the present invention provides an elevator light curtain blind spot detection method, comprising the following contents:

[0034] 1. Parameter input: input the test parameters through the buttons on the control box and the control panel;

[0035] 2. Initialization: The first moving mechanism drives the TX end of the light curtain to move backward to the first horizontal limit sensor, and records the initial position coordinates of the TX end of the light curtain. The second moving mechanism moves the obstruction to the second horizontal limit sensor close to the RX end of the light curtain, and records the initial horizontal position coordinates of the obstruction. The third moving mechanism moves the obstruction to the lower limit sensor, and records the initial vertical position coordinates of the obstruction.

[0036] 3. Action of the blocking object: before the action of the blocking object, open the TX end and the RX end of the light curtain, the third moving mechanism drives the blocking object to move from bottom to top through the lower limit sensor to the upper limit sensor, the second moving mechanism drives the blocking object to move the first set distance d1 in the direction away from the RX end, the third moving mechanism drives the blocking object to move from top to bottom through the lower limit sensor to the lower-lower limit sensor, the second moving mechanism drives the blocking object to move the first set distance d1 in the direction away from the RX end, repeat the above movements until the blocking object is close to the TX end of the light curtain; then the blocking object moves to the initialization position, the first moving mechanism drives the TX end of the light curtain to move the second set distance d2 in the direction of the RX end of the light curtain, repeat the above steps until the spacing of the light curtains is less than the set distance; the above actions are one action cycle, and the blocking object action executes one or more action cycles according to the settings;

[0037] 4. Blind spot coordinate recording: During this period, when the obstruction moves between the lower limit sensor and the upper limit sensor, the RX end of the light curtain should output an obstruction signal. If the RX end of the light curtain does not output an obstruction signal, it is recorded as a blind spot, and the following parameters are recorded at the same time: the horizontal position of the first moving mechanism; the horizontal position of the second moving mechanism; the vertical position of the third moving mechanism; and the cumulative number of blind spots that occur;

[0038] 5. Blind spot reproduction: The position information of the blind spot is recorded in the control unit. The operator selects the blind spot to be reproduced by pressing the buttons and operating the control panel. The first moving mechanism, the second moving mechanism, and the third moving mechanism automatically move to the recorded position information of the blind spot. At this time, there should be no blocking signal at the RX end of the light curtain;

[0039] 6. Fault detection: During the detection process, when the obstruction moves to the lower limit sensor, the obstruction is outside the detection area at this time, and there should be no obstruction signal. If there is an obstruction signal at this time, it may be that other obstructions accidentally enter the detection area, or the light curtain fails. At this time, an error alarm is issued through one or more methods of sound, light, and electricity, and the detection is stopped.

[0040] Furthermore, in order to improve the probability of blind spot finding, the light curtain performs a single-line scan in one action cycle, which is one of the following five scans:

[0041] One send, one receive; two send, two receive… until thirty-six send, thirty-six receive;

[0042] One send, two receive; two send, three receive… until thirty-five send, thirty-six receive;

[0043] One send and three receive, two send and four receive… until thirty-four send and thirty-six receive;

[0044] Two launches and one retract, three launches and two retracts… until thirty-six launches and thirty-five retracts;

[0045] Three launches and one retract, four launches and two retracts… until thirty-six launches and thirty-four retracts;

[0046] Five scans are performed cyclically in multiple action cycles in no particular order.

[0047] Furthermore, in order to reproduce the position of the blind spot more accurately, if when the blind spot is reproduced, after the obstruction moves to the recorded coordinates, there is no obstruction signal at the RX end of the light curtain, then slowly move the obstruction up and down until the blind spot is found. If the light curtain is still in an obstructed state after repeated up and down movements, then move the obstruction horizontally left and right, and repeat this action multiple times until the light curtain outputs a normal state signal.

[0048] Furthermore, in order to simulate the actual installation state of the light curtain, the blind spot detection device is provided with a vertical tolerance adjustment mechanism, a horizontal tolerance adjustment mechanism, a lateral tolerance adjustment mechanism, and a longitudinal tolerance adjustment mechanism. After completing one or several action cycles, one or more of the following parameters are adjusted before the next action cycle is performed:

[0049] The relative vertical tolerance between the TX end of the light curtain and the RX end of the light curtain is adjusted by the vertical tolerance adjustment mechanism;

[0050] The relative horizontal tolerance between the TX end of the light curtain and the RX end of the light curtain is adjusted by the horizontal tolerance adjustment mechanism;

[0051] The relative lateral allowable angle difference between the light curtain TX end and the light curtain RX end is adjusted by the lateral allowable angle difference adjustment mechanism;

[0052] The relative longitudinal permissible angle difference between the TX end of the light curtain and the RX end of the light curtain is adjusted by the longitudinal permissible angle difference adjustment mechanism.

[0053] The beneficial effects of the present invention are:

[0054] 1. The blind spot detection device of the present invention moves in the detection area through the obstruction, and measures whether there is no obstruction through the feedback of the light curtain RX end. Compared with the detection method of repeatedly entering the detection area vertically, the detection efficiency is faster and the position is not missed. It also has a blind spot reproduction function, which can display the blind spot position more intuitively and repeatedly verify the blind spot. Therefore, the present invention has higher detection efficiency and higher reliability.

[0055] 2. The blind spot detection device described in the present invention can adjust the spacing of the light curtains through the first moving mechanism to simulate the distance of the actual light curtains, thereby achieving a better detection effect.

[0056] 3. The blind spot detection device described in the present invention uses an upper limit sensor, a lower limit sensor, and a lower-lower limit sensor to allow the obstruction to leave / enter the detection area in stages, detect whether the light curtain is in a normal state, and whether there are other objects entering the detection area, thereby avoiding the invalidity of the overall detection data. Therefore, the present invention has higher reliability.

[0057] 4. The blind spot detection device of the present invention can be installed with a vertical tolerance adjustment mechanism, a horizontal tolerance adjustment mechanism, a lateral angular difference adjustment mechanism, and a longitudinal angular difference adjustment mechanism according to actual needs, and can drive the TX end or the RX end of the light curtain to make corresponding adjustment actions according to the needs of system settings. It can simulate various installation errors of the light curtain in actual work to check whether it has blind spots, which has higher practical significance than the detection under the installation with zero error.

[0058] 5. The blind spot detection method described in the present invention realizes the detection and reproduction of blind spots and can repeatedly verify blind spots. The present invention has higher detection efficiency and higher reliability.

[0059] 6. In the blind spot detection method described in the present invention, the light curtain performs single-line scanning within one action cycle, and only one scanning mode is detected in a single cycle. As long as there is a single scanning mode without obstruction, it can be identified as a blind spot. Compared with the conventional scanning method, the present invention can more easily detect the blind spot position.

[0060] 7. When the blind spot detection method of the present invention reproduces the blind spot, after the obstruction moves to the recorded coordinates, there is no obstruction signal at the RX end of the light curtain, then the obstruction is slowly moved up and down until the blind spot is found. If the light curtain is still in an obstruction state after repeated up and down movements, the obstruction is moved horizontally left and right, and this action is repeated multiple times until the light curtain outputs a normal state signal. The present invention can be used to find the exact position of the blind spot by slightly moving near the recorded blind spot coordinates, thereby improving the accuracy of the blind spot.

[0061] 8. The blind spot detection method described in the present invention can adjust the horizontal tolerance, vertical tolerance, lateral angular tolerance, and longitudinal angular tolerance of the light curtain as needed, simulate the actual installation conditions of the light curtain, and improve the authenticity of the detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 This is a schematic diagram of the structure of the elevator light curtain blind spot detection device in Example 1;

[0063] Figure 2 This is a schematic diagram of the structure of a second moving mechanism, a third moving mechanism, and a shielding object on a second mounting surface in an embodiment;

[0064] Figure 3 This is a schematic diagram of the structure of the elevator light curtain blind spot detection device in Example 2;

[0065] Figure 4 This is a schematic diagram of the structure of a TX end bracket, an RX end bracket, etc. on a first mounting surface in an embodiment;

[0066] Figure 5 for Figure 4 The local enlarged view of point I in the middle;

[0067] Figure 6 for Figure 4 A partial enlarged view of position II in the middle;

[0068] Figure 7 for Figure 4 A partial enlarged view of point III in the middle;

[0069] Figure 8 It is the rear axonometric drawing of the vertical tolerance adjustment mechanism and the lateral tolerance adjustment mechanism;

[0070] Fig. 9 for Figure 8 A partial enlarged view of the IV position;

[0071] Fig.10 is the occluder motion trajectory 1;

[0072] Fig.11 is the second trajectory of the occluder action;

[0073] Fig.12 Five forms of single line scanning for light curtains.

[0074] In the figure:

[0075] 1 frame;

[0076] 2TX end bracket; 201 first upper connecting plate; 202 first lower connecting plate; 203 first connecting column;

[0077] 3RX end bracket; 301 second upper connecting plate; 302 second lower connecting plate;

[0078] 4 light curtain TX end;

[0079] 5 light curtain RX end;

[0080] 6. Obstructions;

[0081] 7. Control box;

[0082] 11 vertical tolerance adjustment mechanism; 1101 vertical movable column; 1102 fourth driving mechanism;

[0083] 12 horizontal tolerance adjustment mechanism; 1201 second upper top plate; 1202 second lower bottom plate; 1203 horizontal movable column; 1204 third driving mechanism; 1205 third connecting block;

[0084] 13 lateral allowable angle difference adjustment mechanism; 1301 first upper top plate; 1302 first lower bottom plate; 1303 second connecting column; 1304 first driving mechanism; 1305 first short column; 1306 first limit block;

[0085] 14 longitudinal allowable angle difference adjustment mechanism; 1401 swing column; 1402 horizontal rotation axis; 1403 second driving mechanism; 1404 second short column; 1405 second limit block;

[0086] 21 first moving mechanism; 22 second moving mechanism; 23 third moving mechanism;

[0087] 31 first clamping mechanism; 32 second clamping mechanism;

[0088] 41 upper limit sensor; 42 lower limit sensor; 43 upper upper limit sensor; 44 lower lower limit sensor. DETAILED DESCRIPTION

[0089] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0090] Embodiment 1, as Figure 1-2 As shown, an elevator light curtain blind spot detection device includes a frame 1; the frame 1 is constructed with aluminum alloy profiles, and the joints are installed with angle brackets. A roller with a brake is provided at the bottom of the frame 1 to facilitate assembly and movement; the frame 1 has at least two vertical mounting surfaces, including a first mounting surface and a second mounting surface; the first mounting surface is used to install the light curtain, and the second mounting surface is used to install a shielding object 6.

[0091] Specifically: a sliding TX end bracket 2 and a fixed RX end bracket 3 are installed on the first mounting surface, and the TX end bracket 2 is driven to move by a first moving mechanism 21. The first moving mechanism 21 adopts a synchronous belt linear module, and the synchronous belt linear module is horizontally fixed on the frame 1. The slider on the module and the TX end bracket 2 are fixed. Two first horizontal limit sensors are arranged on the synchronous belt linear module, and their positions are determined according to the detection distance of the light curtain. If the effective distance of the light curtain is 4m, one of the first horizontal limit sensors is located 4m away from the light curtain, and the other horizontal limit sensor is located at a position where the light curtain is closer or close to each other.

[0092] The TX end bracket 2 is mounted with the light curtain TX end 4 through the first clamping mechanism 31; the RX end bracket 3 is mounted with the light curtain RX end 5 through the second clamping mechanism 32; the first clamping mechanism 31 and the second clamping mechanism 32 adopt finger cylinders; after clamping, the light curtain TX end 4 and the light curtain RX end 5 are arranged face to face and at the same height.

[0093] The plane where the light curtain TX end 4 and the light curtain RX end 5 are located is the detection plane, and the rectangular plane area between the light curtain TX end 4 and the light curtain RX end 5 is the detection area, which is an area 25mm to 1600mm above the simulated car sill.

[0094] The second mounting surface is installed with a second moving mechanism 22 for horizontal movement, a third moving mechanism 23 for vertical movement, and a shielding object 6. The second moving mechanism 22 adopts a synchronous belt linear module, and its two ends are fixed on the crossbeam at the middle height of the frame 1 through brackets. The second moving mechanism 22 is provided with two second horizontal limit sensors for limiting its left and right extreme positions. The second horizontal limit sensors respectively send signals when the shielding object 6 is close to the light curtain TX end 4 and the light curtain RX end 5.

[0095] The third moving mechanism 23 also uses a synchronous belt linear module. The housing of the synchronous belt linear module is fixedly connected to the movable end of the second moving mechanism 22. The upper and lower ends of the housing are respectively slidably connected to the upper beam and the lower beam of the frame 1. The shield 6 is installed at the movable end of the third moving mechanism 23. The length direction of the shield 6 is perpendicular to the detection plane, and the shield 6 and the detection plane intersect. The shield 6 is a 50mm diameter cylindrical wooden shield 6, which is light in weight and has a good shielding effect. The second moving mechanism 22 controls the horizontal position of the shield 6, and the third moving mechanism 23 controls the vertical position of the shield 6.

[0096] The third moving mechanism 23 is provided with an upper limit sensor 41 and a lower limit sensor 42. When the upper limit sensor 41 or the lower limit sensor 42 has a signal, the obstruction 6 is respectively located at the upper edge and the lower edge of the detection area. The third moving mechanism 23 is also provided with at least one of the upper upper limit sensor 43 and the lower lower limit sensor 44. The upper upper limit sensor 43 and the lower lower limit sensor 44 are located outside the detection area.

[0097] The upper limit sensor 41 and the lower limit sensor 42 are used to calibrate the position of the detection area. During detection, the third moving mechanism 23 drives the obstruction 6 from the lower limit sensor 44 upward through the lower limit sensor 42 to the upper limit sensor 41, and then the obstruction 6 moves horizontally and then descends to the lower limit sensor 44. The obstruction 6 has a process of entering the detection area and finally exiting the detection area, so it must be a no-obstruction signal-an obstruction signal-no-obstruction signal change. If the obstruction 6 is always moving in the detection area, it will be impossible to determine whether the obstruction signal is always present because there is no blind spot or the light curtain is faulty. It will only output a signal of obstruction, or other objects have invaded the detection area, resulting in inaccurate detection. Therefore, the lower limit sensor 44 is required for verification. When the obstruction 6 moves to the lower limit sensor 44, it indicates that the obstruction 6 has left the detection area. At this time, the light curtain RX end 5 should output a signal of no obstruction. It can be determined that there is no fault during the up and down period of the light curtain, and no other objects have invaded the detection area, thereby avoiding the invalidity of the overall detection data.

[0098] A control box 7 is installed on the frame 1. The shell of the control box 7 is provided with buttons and a control panel. A control unit is provided in the control box 7. The light curtain TX end 4, the light curtain RX end 5, the first moving mechanism 21, the second moving mechanism 22, and the sensor uniform control unit are electrically connected. The control panel can display the number of blind spots, the coordinates of the blind spots, and the number of action cycles. The initial spacing of the light curtain, the distance d1 of each lateral movement of the shielding object 6, and other items can also be set through the control box 7.

[0099] In the above process, the first moving mechanism 21, the second moving mechanism 22, and the third moving mechanism 23 all use synchronous belt linear modules. In other embodiments, linear slides with position control and position feedback functions such as ball screw linear modules, belt linear modules, and gear transmission linear modules can also be used.

[0100] In this solution, the first moving mechanism 21 controls the spacing of the light curtains, the second moving mechanism 22 controls the horizontal position of the shielding object 6, and the third moving mechanism 23 controls the height of the shielding object 6. Fig.10As shown, during detection, the third moving mechanism 23 drives the obstruction 6 to move at a low speed between the upper limit sensor 41 and the lower limit sensor 44, and the moving speed is 1mm / s-5mm / s. After reaching the upper limit sensor 41 and the lower limit sensor 44 each time, the second moving mechanism 22 drives the obstruction 6 to move horizontally by d1, d1 is generally 50mm, until the obstruction 6 passes through the entire detection area in an S shape, and then the spacing of the light curtain is changed, and the measurement is performed again until the light curtain detection can only accommodate one obstruction 6. If the obstruction 6 moves between the upper limit sensor 41 and the lower limit sensor 42, the light curtain RX end 5 feedbacks a no-blocking signal, and at this time, the horizontal position of the first moving mechanism 21, the horizontal position of the second moving mechanism 22, and the vertical position of the third moving mechanism 23 are recorded; because the synchronous belt linear module is used and driven by a servo motor, the sensor can be used as a calibration point position, and the distance position can be known by recording the number of pulses of the servo motor between the blind spot position and the calibration point position. When the detection is completed, the number of blind spots and the coordinates of the blind spots are displayed on the control panel. By selecting the blind spot, the position of the blind spot can be reproduced, and it can be moved to the corresponding sensor, and then moved according to the recorded number of pulses of the servo motor to return to the position of the blind spot. This solution can also use the lower limit sensor 44 to allow the obstruction 6 to leave / enter the detection area in stages, detect whether the light curtain is in a normal state, and whether there are other objects entering the detection area, thereby avoiding the invalidity of the overall detection data. Therefore, this solution has higher reliability. Compared with an elevator light curtain reliability test device and test method applied by our company, the obstruction 6 does not need to move repeatedly perpendicular to the detection plane. This solution is specifically used for the detection of blind spots, with faster detection efficiency and no omissions in the position. It also has a blind spot reproduction function, which can more intuitively display the position of the blind spot and repeatedly verify the blind spot. Therefore, this solution has higher detection efficiency and higher reliability.

[0101] In the above scheme, the upper limit sensor 43 is not installed. If the upper limit sensor 43 is installed, during detection, the third moving mechanism 23 drives the shielding object 6 to move at a low speed between the upper limit sensor 43 and the lower limit sensor 44. Fig.11 As shown, the upper limit sensor 43 and the lower limit sensor 44 respectively detect whether the light curtain is in a normal state.

[0102] Embodiment 2, as Figure 3-9 As shown, the blind spot detection device is provided with a vertical tolerance adjustment mechanism 11, a horizontal tolerance adjustment mechanism 12, a lateral tolerance angle adjustment mechanism 13, and a longitudinal tolerance angle adjustment mechanism 14.

[0103] like Figure 4As shown, the TX end bracket 2 is installed with a transverse allowable angle difference adjustment mechanism 13, the movable end of the transverse allowable angle difference adjustment mechanism 13 is installed with a longitudinal allowable angle difference adjustment mechanism 14, and the first clamping mechanism 31 is installed at the movable end of the longitudinal allowable angle difference adjustment mechanism 14; the TX end bracket 2 includes a first upper connecting plate 201, a first lower connecting plate 202, and a first connecting column 203 which are fixedly connected in sequence, the first upper connecting plate 201 and the first lower connecting plate 202 are both slidably installed on the first mounting surface, the movable end of the first moving mechanism 21 is fixedly connected to the first upper connecting plate 201,

[0104] like Figure 7-9 As shown, the lateral allowable angle difference adjustment mechanism 13 includes a first upper top plate 1301, a first lower bottom plate 1302, a second connecting column 1303 and a first driving mechanism 1304, wherein the first upper top plate 1301 is rotatably connected to the first upper connecting plate 201, the first lower bottom plate 1302 is rotatably connected to the first lower connecting plate 202, the first driving mechanism 1304 is a ball screw linear module, the ball screw linear module is fixed on the first lower connecting plate 202, and a first short column 1305 is fixed on its slider; the first lower bottom plate 1302 is connected to a first limit block 1306, the first limit block 1306 is provided with a waist hole, and the first short column 1305 is arranged in the above waist hole. Therefore, the ball screw linear module can drive the first short column 1305 to move, and the first short column 1305 pushes the first limit block 1306, thereby driving the first lower base plate 1302 to rotate. The existence of the waist hole can ensure that the first short column 1305 has enough space for movement to avoid getting stuck.

[0105] like Figure 8-9 As shown, the longitudinal allowable angle difference adjustment mechanism 14 includes a swing column 1401, a horizontal rotation shaft 1402 and a second driving mechanism 1403. The swing column 1401 is rotatably arranged at the middle position of the second connecting column 1303 through the horizontal rotation shaft 1402. The first clamping mechanism 31 is installed on the swing column 1401. The side surface of the lower end of the swing column 1401 is provided with an angle iron for limiting the light curtain TX end 4 in the up and down directions. The second driving mechanism 1403 also adopts a ball screw linear module, and a second limit block 1405 is installed on its slider. A second short column 1404 is arranged on the side of the swing column 1401, and the second short column 1404 is located in the waist hole of the second limit block 1405. Therefore, the second driving mechanism 1403 drives its slider to move, and the second limit block 1405 on the slider drives the second short column 1404, so as to realize the rotation of the swing column 1401. The existence of the waist hole can ensure that the second short column 1404 has sufficient space for movement to avoid getting stuck.

[0106] In addition, the central axis of the light curtain TX end 4 is coaxial with the rotation axis of the lateral angular tolerance adjustment mechanism 13, so that when the lateral angular tolerance is adjusted, no additional horizontal tolerance will occur.

[0107] like Figure 4 As shown, the RX end bracket 3 includes a second upper connecting plate 301 and a second lower connecting plate 302, and the second upper connecting plate 301 and the second lower connecting plate 302 are fixedly mounted on the upper and lower ends of the first mounting surface respectively.

[0108] like Figure 5-6 As shown, the horizontal tolerance adjustment mechanism 12 includes a second upper top plate 1201, a second lower bottom plate 1202, a horizontal moving column and a third driving mechanism 1204. The upper and lower ends of the horizontal moving column 1203 are respectively connected to the second upper connecting plate 301 and the second lower connecting plate 302 through a connecting plate, a track, and a slider, and are driven to slide by the second driving mechanism 1403. The sliding direction is perpendicular to the detection plane. The third driving mechanism 1204 adopts a ball screw linear module. The third driving mechanism 1204 is provided with two groups. The sliders of the two groups of the third driving mechanism 1204 are respectively fixedly connected to the second upper top plate 1201 and the second lower bottom plate 1202 through the third connecting block 1205. Therefore, the third driving mechanism 1204 can directly drive the light curtain RX end 5 to move perpendicular to the detection plane to adjust the horizontal tolerance.

[0109] like Figure 5-6 As shown, the vertical tolerance adjustment mechanism 11 includes a vertical moving column 1101 and a fourth driving mechanism 1102. The vertical moving column 1101 is slidably arranged on the horizontal moving column 1203 through a guide rail and a slider, and is driven to slide by the fourth driving mechanism 1102. The fourth driving mechanism 1102 adopts a ball screw linear module, and its slider is connected to the upper end of the vertical moving column 1101. The second clamping mechanism 32 is installed on the vertical moving column 1101. Therefore, the fourth driving mechanism 1102 can directly drive the light curtain RX end 5 to move up and down to adjust the vertical tolerance.

[0110] In this embodiment, the first drive mechanism 1304, the second drive mechanism 1403, the third drive mechanism 1204, and the fourth drive mechanism 1102 all use ball screw linear modules for easy control. A slotted photoelectric switch can be installed next to the ball screw linear module to calibrate the origin position. When the four drive mechanisms are all at the origin, the horizontal tolerance, vertical tolerance, lateral tolerance angle, and longitudinal tolerance angle are all 0. In the actual detection process, according to the needs of the system settings, adaptive movement is performed to drive the light curtain TX end 4 or RX end to make corresponding adjustment actions. It can simulate various installation errors of the light curtain in real work to check whether it has blind spots, which has higher practical significance than the detection under the installation of 0 error.

[0111] In other embodiments, the first driving mechanism 1304 and the second driving mechanism 1403 can be implemented by using an electric turntable, but the cost is relatively expensive compared to the second embodiment.

[0112] In other embodiments, the second driving mechanism 1403 and the third driving mechanism 1204 can be implemented by other linear motion mechanisms such as a synchronous belt linear module, a belt linear module, and a gear transmission linear module.

[0113] In other embodiments, the vertical tolerance adjustment mechanism 11, the horizontal tolerance adjustment mechanism 12, the lateral tolerance adjustment mechanism 13, and the longitudinal tolerance adjustment mechanism 14 can also be provided with only one or more according to the needs to meet the corresponding needs.

[0114] In other embodiments, the light curtain TX end 4 and the light curtain RX end 5 may swap positions.

[0115] In other embodiments, the vertical tolerance adjustment mechanism 11, the horizontal tolerance adjustment mechanism 12, the transverse angular difference adjustment mechanism 13, and the longitudinal angular difference adjustment mechanism 14 can be superimposed in other ways. The vertical tolerance adjustment mechanism 11 and the horizontal tolerance adjustment mechanism 12 are installed on one side, wherein the vertical tolerance adjustment mechanism 11 is installed on the TX end bracket 2, the horizontal tolerance adjustment mechanism 12 is installed on the movable end of the vertical tolerance adjustment mechanism 11, the first clamping mechanism 31 is installed on the horizontal tolerance adjustment mechanism 12, the transverse angular difference adjustment mechanism 13 and the longitudinal angular difference adjustment mechanism 14 are installed on the other side, wherein the longitudinal angular difference adjustment mechanism is installed on the RX end bracket 3, the transverse angular difference adjustment mechanism 13 is installed on the movable end of the longitudinal angular difference adjustment mechanism, and the second clamping mechanism 32 is installed on the transverse angular difference adjustment mechanism 13. For another example, the vertical tolerance adjustment mechanism 11, the horizontal tolerance adjustment mechanism 12, and the transverse angular difference adjustment mechanism 13 are installed on one side and are superimposed using reasonable results, and the longitudinal angular difference adjustment mechanism 14 is installed separately on the other side. For another example, the vertical tolerance adjustment mechanism 11, the horizontal tolerance adjustment mechanism 12, the transverse angular difference adjustment mechanism 13, and the longitudinal angular difference adjustment mechanism 14 are all installed on the TX end bracket 2. The above only needs to adopt a reasonable structure for superposition, and the four tolerance adjustment functions can be achieved, and all fall within the protection scope of the present invention.

[0116] Another aspect of the present invention provides an elevator light curtain blind spot detection method. It should be noted that the elevator light curtain blind spot detection method provided by an embodiment of the present invention and the elevator light curtain blind spot detection device provided by an embodiment of the present invention are based on the same inventive concept. Therefore, the specific implementation of this embodiment can refer to the implementation of the aforementioned elevator light curtain blind spot detection device, and the repeated parts will not be repeated.

[0117] The detection methods include the following:

[0118] 1. Parameter input: input the detection parameters through the buttons on the control box 7 and the control panel; including the moving speed of the obstruction 6, the width of the light curtain, the first set distance d1, the second set distance d2, the number of cycles, etc.;

[0119] 2. Initialization: The first moving mechanism 21 drives the light curtain TX end 4 to move backward to the first horizontal limit sensor, and records the initial position coordinates of the light curtain TX end 4; the second moving mechanism 22 moves the shielding object 6 to the second horizontal limit sensor close to the light curtain RX end 5, and records the initial horizontal position coordinates of the shielding object 6; the third moving mechanism 23 moves the shielding object 6 to the lower limit sensor 44, and records the initial vertical position coordinates of the shielding object 6;

[0120] 3. Blocking Object 6 Action: Fig.10 As shown, before the shielding object 6 moves, the light curtain TX end 4 and the light curtain RX end 5 are turned on, the third moving mechanism 23 drives the shielding object 6 to move from bottom to top through the lower limit sensor 42 to the upper limit sensor 41, the second moving mechanism 22 drives the shielding object 6 to move the first set distance d1 in the direction away from the RX end, the third moving mechanism 23 drives the shielding object 6 to move from top to bottom through the lower limit sensor 42 to the lower limit sensor 44, the second moving mechanism 22 drives the shielding object 6 to move the first set distance d1 in the direction away from the RX end, and repeat the above movements until the shielding object 6 is close to the light curtain TX end 4; then the shielding object 6 moves to the initialization position, the first moving mechanism 21 drives the light curtain TX end 4 to move the second set distance d2 in the direction of the light curtain RX end 5, and repeat the above steps until the spacing of the light curtains is less than the set distance; the above movements are one action cycle, and the shielding object 6 moves to perform one or more action cycles according to the settings;

[0121] 4. Blind spot coordinate recording: During this period, when the obstruction 6 moves between the lower limit sensor 42 and the upper limit sensor 41, the light curtain RX end 5 should output an obstruction signal. If the light curtain RX end 5 does not output an obstruction signal, it is recorded as a blind spot, and the following parameters are recorded at the same time: the horizontal position of the first moving mechanism 21; the horizontal position of the second moving mechanism 22; the vertical position of the third moving mechanism 23; and the cumulative number of blind spots that occur;

[0122] 5. Blind spot reproduction: The position information of the blind spot is recorded in the control unit. The operator selects the blind spot to be reproduced by pressing the buttons and operating the control panel. The first moving mechanism 21, the second moving mechanism 22, and the third moving mechanism 23 automatically move to the recorded position information of the blind spot. At this time, the light curtain RX end 5 should have no blocking signal;

[0123] 6. Fault detection: During the detection process, when the obstruction 6 moves to the lower limit sensor 44, the obstruction 6 is outside the detection area at this time, and there should be no obstruction signal. If there is an obstruction signal at this time, it may be that other obstructions 6 accidentally enter the detection area, or the light curtain fails. At this time, an error alarm is issued through one or more methods of sound, light, and electricity, and the detection is stopped.

[0124] In this solution, the first moving mechanism 21 controls the spacing of the light curtains, the second moving mechanism 22 controls the horizontal position of the shielding object 6, and the third moving mechanism 23 controls the height of the shielding object 6. Fig.10 As shown, during detection, the third moving mechanism 23 drives the obstruction 6 to move between the upper limit sensor 41 and the lower limit sensor 44. Each time after reaching the upper limit sensor 41 and the lower limit sensor 44, the second moving mechanism 22 drives the obstruction 6 to move horizontally by d1, d1 is generally 50 mm, until the obstruction 6 passes through the entire detection area in an S shape, and then the spacing of the light curtain is changed, and measurement is performed again until the light curtain detection can only accommodate one obstruction 6. If the obstruction 6 moves between the upper limit sensor 41 and the lower limit sensor 42, the light curtain RX end 5 feedbacks a no-obstruction signal, and at this time, the horizontal position of the first moving mechanism 21, the horizontal position of the second moving mechanism 22, and the vertical position of the third moving mechanism 23 are recorded; because the synchronous belt linear module is used and driven by a servo motor, the sensor can be used as a calibration point position, and the distance position can be known by recording the number of pulses of the servo motor between the blind spot position and the calibration point position. When the detection is completed, the number of blind spots and the coordinates of the blind spots are displayed on the control panel. By selecting the blind spot, the position of the blind spot can be reproduced, and the position can be moved to the corresponding sensor, and then moved according to the recorded number of pulses of the servo motor to return to the position of the blind spot. This solution can also use the lower limit sensor 44 to allow the obstruction 6 to leave / enter the detection area in stages, detect whether the light curtain is in a normal state, and whether there are other objects entering the detection area, thereby avoiding the invalidation of the overall detection data. Therefore, this solution has higher reliability. Compared with an elevator light curtain reliability test device and test method applied by our company, the obstruction 6 does not need to move repeatedly perpendicular to the detection plane. This solution is specifically used for the detection of blind spots, has a faster detection efficiency, and has a blind spot reproduction function, which can more intuitively display the position of the blind spot and repeatedly verify the blind spot. Therefore, this solution has higher detection efficiency and higher reliability.

[0125] In the above scheme, the upper limit sensor 43 is not installed. If the upper limit sensor 43 is installed, during detection, the third moving mechanism 23 drives the shielding object 6 to move at a low speed between the upper limit sensor 43 and the lower limit sensor 44. Fig.11 As shown, the upper limit sensor 43 and the lower limit sensor 44 respectively detect whether the light curtain is in a normal state.

[0126] In practical applications, such as Fig.12 As shown in the figure, in one action cycle, the light curtain performs a single-line scan, which is one of the following five scans:

[0127] One send, one receive; two send, two receive… until thirty-six send, thirty-six receive;

[0128] One send, two receive; two send, three receive… until thirty-five send, thirty-six receive;

[0129] One send and three receive, two send and four receive… until thirty-four send and thirty-six receive;

[0130] Two launches and one retract, three launches and two retracts… until thirty-six launches and thirty-five retracts;

[0131] Three launches and one retract, four launches and two retracts… until thirty-six launches and thirty-four retracts;

[0132] Five scans are performed cyclically in multiple action cycles in no particular order.

[0133] If a conventional scanning method is used, the above five scanning methods will be executed sequentially within a scanning cycle. If one of the scanning methods is blocked, an occlusion signal will be output. Therefore, if there is no occlusion in some scanning methods, no unobstructed signal will be output. In this scheme, only one scanning method is detected in a single cycle. As long as there is no occlusion in a single scanning method, it can be identified as a blind spot. Compared with the conventional scanning method, this scheme can more easily detect the blind spot position.

[0134] In actual application, if the blind spot reappears, after the shielding object 6 moves to the recorded coordinates, and there is no shielding signal at the light curtain RX end 5, the shielding object 6 is slowly moved up and down until the blind spot is found. If the light curtain is still in a shielding state after repeated up and down movements, the shielding object 6 is moved horizontally left and right, and this action is repeated many times until the light curtain outputs a normal state signal. This solution can be used to find the exact position of the blind spot by slightly moving near the recorded blind spot coordinates, thereby improving the accuracy of the blind spot.

[0135] In practical applications, the blind spot detection device is provided with a vertical tolerance adjustment mechanism 11, a horizontal tolerance adjustment mechanism 12, a lateral tolerance adjustment mechanism 13, and a longitudinal tolerance adjustment mechanism 14. After completing one or several action cycles, one or more of the following parameters are adjusted before the next action cycle is performed:

[0136] The relative vertical tolerance between the light curtain TX end 4 and the light curtain RX end 5 is adjusted by the vertical tolerance adjustment mechanism 11;

[0137] The relative horizontal tolerance between the light curtain TX end 4 and the light curtain RX end 5 is adjusted by the horizontal tolerance adjustment mechanism 12;

[0138] The relative lateral permissible angle difference between the light curtain TX end 4 and the light curtain RX end 5 is adjusted by the lateral permissible angle difference adjustment mechanism 13;

[0139] The relative longitudinal permissible angle difference between the light curtain TX end 4 and the light curtain RX end 5 is adjusted by the longitudinal permissible angle difference adjustment mechanism 14 .

[0140] In this solution, according to the needs of system settings, the light curtain TX end 4 or RX end is driven to make corresponding adjustments. It can simulate various installation errors of the light curtain in real work and check whether it has blind spots. Compared with the detection under zero error installation, it has higher practical significance.

[0141] In summary, the elevator light curtain blind spot detection device described in the present invention can measure blind spots more efficiently and accurately, and can reproduce the positions of blind spots. It can also simulate the errors of actual installation through various adjustment mechanisms to improve the authenticity of detection.

[0142] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above implementation is only to illustrate the technical concept and features of the present invention, and its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An elevator light curtain blind spot detection device, characterized in that: Includes framework (1); The frame (1) is provided with two vertical mounting surfaces, including a first mounting surface and a second mounting surface; The first mounting surface is mounted with a TX end bracket (2) and an RX end bracket (3); at least one of the TX end bracket (2) and the RX end bracket (3) is slidably mounted on the first mounting surface and is driven to move by a first moving mechanism (21); the first moving mechanism (21) is provided with two first horizontal limit sensors for limiting its left and right extreme positions; The TX end bracket (2) is mounted with a light curtain TX end (4) via a first clamping mechanism (31); The RX end bracket (3) is mounted with a light curtain RX end (5) via a second clamping mechanism (32); The plane where the light curtain TX end (4) and the light curtain RX end (5) are located is the detection plane, and the rectangular plane area between the light curtain TX end (4) and the light curtain RX end (5) is the detection area; The second mounting surface is mounted with a second moving mechanism (22) capable of horizontal movement, a third moving mechanism (23) capable of vertical movement, and a shielding object (6); the second moving mechanism (22) is mounted on the second plane; the second moving mechanism (22) is provided with two second horizontal limit sensors for limiting its left and right extreme positions; the third moving mechanism (23) is mounted on the movable end of the second moving mechanism (22); the shielding object (6) is mounted on the movable end of the third moving mechanism (23); the length direction of the shielding object (6) is perpendicular to the detection plane, and the shielding object (6) and the detection plane intersect; The first moving mechanism (21), the second moving mechanism (22), and the third moving mechanism (23) all have position control and position feedback functions; The third moving mechanism (23) is provided with an upper limit sensor (41) and a lower limit sensor (42). When the upper limit sensor (41) or the lower limit sensor (42) has a signal, the obstruction (6) is located at the upper edge and the lower edge of the detection area respectively. The third moving mechanism (23) is also provided with at least one of an upper upper limit sensor (43) and a lower lower limit sensor (44). The upper upper limit sensor (43) and the lower lower limit sensor (44) are located outside the detection area. A control box (7) is mounted on the frame (1); a button and a control panel are arranged on a shell of the control box (7); a control unit is arranged in the control box (7); the light curtain TX end (4), the light curtain RX end (5), the first moving mechanism (21), the second moving mechanism (22), and the sensor uniformity control unit are electrically connected; The TX end bracket (2) and the RX end bracket (3) are installed with one or more of the following adjustment mechanisms: A vertical tolerance adjustment mechanism (11) capable of adjusting the upper and lower positions of one end of the light curtain; A horizontal tolerance adjustment mechanism (12) capable of adjusting the horizontal position of one end of the light curtain; A transverse allowable angle difference adjustment mechanism (13) capable of adjusting the longitudinal angle of one end of the light curtain; A longitudinal allowable angle difference adjustment mechanism (14) capable of adjusting the longitudinal angle of one end of the light curtain; When multiple adjustment mechanisms are installed on any one of the TX end bracket (2) and the RX end bracket (3), the structures of the multiple adjustment mechanisms are superimposed in sequence; The TX end bracket (2) is provided with a transverse allowable angle difference adjustment mechanism (13), a movable end of the transverse allowable angle difference adjustment mechanism (13) is provided with a longitudinal allowable angle difference adjustment mechanism (14), and the first clamping mechanism (31) is provided at the movable end of the longitudinal allowable angle difference adjustment mechanism (14); The RX end bracket (3) is provided with a horizontal tolerance adjustment mechanism (12), a movable end of the horizontal tolerance adjustment mechanism (12) is provided with a vertical tolerance adjustment mechanism (11), and the second clamping mechanism (32) is provided at the movable end of the vertical tolerance adjustment mechanism (11); The TX end bracket (2) comprises a first upper connecting plate (201), a first lower connecting plate (202), and a first connecting column (203) which are fixedly connected in sequence; the first upper connecting plate (201) and the first lower connecting plate (202) are both slidably mounted on a first mounting surface; a movable end of the first moving mechanism (21) is fixedly connected to the first upper connecting plate (201); The lateral allowable angle difference adjustment mechanism (13) comprises a first upper top plate (1301), a first lower bottom plate (1302), a second connecting column (1303) and a first driving mechanism (1304); the first upper top plate (1301) and the first lower bottom plate (1302) are rotatably connected to the first upper connecting plate (201) and the first lower connecting plate (202), respectively, and are driven to rotate by the first driving mechanism (1304); The longitudinal allowable angle difference adjustment mechanism (14) comprises a swing column (1401), a horizontal rotation shaft (1402) and a second driving mechanism (1403); the swing column (1401) is rotatably arranged at the middle position of the second connecting column (1303) via the horizontal rotation shaft (1402) and driven to swing by the second driving mechanism (1403); the horizontal rotation shaft (1402) is perpendicular to the detection plane; and a first clamping mechanism (31) is installed on the swing column (1401).

2. An elevator light curtain blind spot detection device according to claim 1, characterized in that: The RX end bracket (3) comprises a second upper connecting plate (301) and a second lower connecting plate (302), wherein the second upper connecting plate (301) and the second lower connecting plate (302) are fixedly mounted at the upper and lower ends of the first mounting surface, respectively. The horizontal tolerance adjustment mechanism (12) comprises a horizontal movable column (1203) and a third driving mechanism (1204); the upper and lower ends of the horizontal movable column (1203) are slidably connected to the second upper connecting plate (301) and the second lower connecting plate (302) via a track and a slider, respectively, and are driven to slide by the second driving mechanism (1403); the sliding direction is perpendicular to the detection plane. The vertical tolerance adjustment mechanism (11) comprises a vertical movable column (1101) and a fourth driving mechanism (1102); the vertical movable column (1101) is slidably arranged on a horizontal movable column (1203) and driven to slide by the fourth driving mechanism (1102); and a second clamping mechanism (32) is installed on the vertical movable column (1101).

3. An elevator light curtain blind spot detection device according to claim 1 or 2, characterized in that: The first moving mechanism (21), the second moving mechanism (22), and the third moving mechanism (23) are one of a ball screw linear module, a synchronous belt linear module, a belt linear module, and a gear transmission linear module.

4. The detection method of the elevator light curtain blind spot detection device according to claim 1, characterized in that: Includes the following:

1. Parameter input: input the test parameters through the buttons on the control box (7) and the control panel; 2. Initialization: the first moving mechanism (21) drives the light curtain TX end (4) to move backward to the first horizontal limit sensor, and records the initial position coordinates of the light curtain TX end (4); the second moving mechanism (22) moves the obstruction (6) to the second horizontal limit sensor close to the light curtain RX end (5), and records the initial horizontal position coordinates of the obstruction (6); the third moving mechanism (23) moves the obstruction (6) to the lower limit sensor (44), and records the initial vertical position coordinates of the obstruction (6); 3. Movement of the obstruction (6): Before the movement of the obstruction (6), the light curtain TX end (4) and the light curtain RX end (5) are opened, the third moving mechanism (23) drives the obstruction (6) from bottom to top, passes through the lower limit sensor (42), and then moves to the upper limit sensor (41), the second moving mechanism (22) drives the obstruction (6) to move a first set distance d1 in a direction away from the RX end, and the third moving mechanism (23) drives the obstruction (6) from top to bottom, passes through the lower limit sensor (42), and then moves to the lower lower limit sensor (44). , the second moving mechanism (22) drives the shielding object (6) to move a first set distance d1 in a direction away from the RX end, and the above movement is repeated until the shielding object (6) is close to the TX end (4) of the light curtain; then the shielding object (6) moves to the initialization position, and the first moving mechanism (21) drives the TX end (4) of the light curtain to move a second set distance d2 in the direction of the RX end (5) of the light curtain, and the above steps are repeated until the spacing of the light curtains is less than the set distance; the above actions are one action cycle, and the action of the shielding object (6) executes one or more action cycles according to the setting; 4. Recording of blind spot coordinates: During this period, when the obstruction (6) moves between the lower limit sensor (42) and the upper limit sensor (41), the light curtain RX end (5) should output an obstruction signal. If the light curtain RX end (5) does not output an obstruction signal, it is recorded as a blind spot, and the following parameters are recorded at the same time: the horizontal position of the first moving mechanism (21); the horizontal position of the second moving mechanism (22); the vertical position of the third moving mechanism (23); and the cumulative number of blind spots that occur; 5. Blind spot reproduction: The position information of the blind spot is recorded in the control unit. The operator selects the blind spot to be reproduced by pressing the buttons and operating the control panel. The first moving mechanism (21), the second moving mechanism (22), and the third moving mechanism (23) automatically move to the recorded position information of the blind spot. At this time, there should be no blocking signal at the RX end (5) of the light curtain; 6. Fault detection: During the detection process, when the obstruction (6) moves to the lower limit sensor (44), the obstruction (6) is outside the detection area at this time, and there should be no obstruction signal. If there is an obstruction signal at this time, it means that other obstructions (6) have accidentally entered the detection area, or the light curtain has a fault. At this time, an error alarm is issued through one or more of sound, light, and electricity, and the detection is stopped.

5. The detection method of the elevator light curtain blind spot detection device according to claim 4, characterized in that: In one action cycle, the light curtain performs a single line scan, which is one of the following five scans: One send, one receive; two send, two receive… until thirty-six send, thirty-six receive; One send, two receive; two send, three receive… until thirty-five send, thirty-six receive; One send and three receive, two send and four receive… until thirty-four send and thirty-six receive; Two launches and one retract, three launches and two retracts… until thirty-six launches and thirty-five retracts; Three launches and one retract, four launches and two retracts… until thirty-six launches and thirty-four retracts; Five scans are performed cyclically in multiple action cycles in no particular order.

6. The detection method of the elevator light curtain blind spot detection device according to claim 4, characterized in that: If the blind spot reappears, after the obstruction (6) moves to the recorded coordinates, there is no obstruction signal at the RX end (5) of the light curtain, then the obstruction (6) is slowly moved up and down until the blind spot is found. If the light curtain is still in an obstruction state after repeated up and down movements, then the obstruction (6) is moved horizontally to the left and right, and this action is repeated multiple times until the light curtain outputs a normal state signal.

7. A detection method for an elevator light curtain blind spot detection device according to any one of claims 4 to 6, characterized in that: The blind spot detection device is provided with a vertical tolerance adjustment mechanism (11), a horizontal tolerance adjustment mechanism (12), a lateral tolerance angle adjustment mechanism (13), and a longitudinal tolerance angle adjustment mechanism (14). After completing one or more action cycles, one or more of the following parameters are adjusted before the next action cycle is performed: The relative vertical tolerance between the light curtain TX end (4) and the light curtain RX end (5) is adjusted by a vertical tolerance adjustment mechanism (11); The relative horizontal tolerance between the light curtain TX end (4) and the light curtain RX end (5) is adjusted by means of a horizontal tolerance adjustment mechanism (12); The relative lateral permissible angle difference between the light curtain TX end (4) and the light curtain RX end (5) is adjusted by a lateral permissible angle difference adjustment mechanism (13); The relative longitudinal permissible angle difference between the light curtain TX end (4) and the light curtain RX end (5) is adjusted by a longitudinal permissible angle difference adjustment mechanism (14).

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