CN217076592U

CN217076592U - Elevator limit switch auxiliary monitoring device

Info

Publication number: CN217076592U
Application number: CN202121239005.1U
Authority: CN
Inventors: 路成龙; 孙勇; 肖昀; 顾雯雯
Original assignee: NANJING SPECIAL EQUIPMENT INSPECTION INSTITUTE
Current assignee: NANJING SPECIAL EQUIPMENT INSPECTION INSTITUTE
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2022-07-29
Anticipated expiration: 2031-06-04

Abstract

The utility model discloses an elevator limit switch assists monitoring devices, including photoelectric sensor and hold-in range, photoelectric sensor sets up at the elevator to heavy last, the photoelectric sensor level sets up, the vertical setting of hold-in range is bottom in the elevator pit, be equipped with the anti-light piece of a plurality of equidistance intervals on the hold-in range, when the elevator to heavy down to the bottom, photoelectric sensor is right the hold-in range is just right. The utility model discloses carry out real-time supervision to the elevator to heavy position, can be within the within range with hitting the position restriction of board under to heavy to make the better performance of limit switch especially upper limit switch.

Description

Elevator limit switch auxiliary monitoring device

Technical Field

The utility model relates to an elevator safety control technical field, in particular to elevator limit switch assists monitoring devices.

Background

The elevator runs up and down in the shaft, and a forced speed reduction switch, a limit switch and a limit switch are sequentially arranged at the end part of the shaft. The limit switch is the last protection switch in the overtravel switch, and can act when the elevator crosses an end station and the limit switch fails, so that the power supply of the elevator is cut off in time, and the elevator stops running. The well pit is provided with the buffer, can cushion the protection to the elevator that dashes the top and squat the end. The electrical switch and the safety component cooperate together to ensure the safety of the device and the passengers.

According to the requirements of 3.10 items in TSG T7001-2009 elevator supervision and inspection and regular inspection rules-traction and forced drive elevators: "the upper and lower ends of the shaft should be provided with limit switches which act before the car or counterweight (if any) contacts the buffer and maintain its state of action while the buffer is compressed". Another 3.15 (5): "a permanent, obvious indication should be placed near the counterweight buffer indicating the maximum allowable vertical distance between the counterweight strike plate and its buffer top surface when the car is in the top-floor end-landing leveling position; and the vertical distance does not exceed the maximum allowed value ". It can be seen that the counterweight down striking plate moves within the permanent identification range of the counterweight buffer, when the elevator continues to move upwards after being at the upper landing level, the elevator meets the upper limit switch, the counterweight moves downwards until the down striking plate is completely pressed on the counterweight buffer, and the limit switch acts before the counterweight down striking plate contacts the buffer. At present, the elevator is mostly dragged by a steel wire rope, the steel wire rope has certain ductility (particularly, the newly-installed elevator is more obvious), and the steel wire rope can be slowly lengthened along with the use of the elevator. The elevator car side is from the flat bed function can guarantee the flat bed precision of car, and this makes the wire rope of extension compensate at heavy side, leads to hitting the board downwards to move to the counter weight. When the downward displacement reaches a certain degree, the counterweight downward collision plate firstly touches the counterweight buffer, and finally the upper limit switch loses the protection significance.

At present, the inspection and judgment operation of a limit switch caused by the extension of a steel wire rope is relatively complicated, an elevator operator cannot judge that the limit switch is qualified by only observing whether a counterweight down-striking plate is in a permanent identification line of a counterweight buffer by naked eyes, whether the pier needs to be disassembled or the steel wire rope is cut, the length change of the steel wire rope can be only regularly observed and recorded, and potential safety hazards can be brought when the operation is not in time. At present, devices for auxiliary monitoring of limit switches in the elevator market do not appear, and inconvenience caused by extension of steel wire ropes is not solved.

For a properly installed elevator, the position of the counterweight down-striking plate should be within the line of the maximum permanent identifier (secondary slow identifier) of the counterweight buffer. After the elevator is put into use, the length of the steel wire rope is gradually increased. Under the flat bed and the automatic adjustment effect of car side, the wire rope of lengthening can lead to shifting down to the counter weight side, when hitting down the board and reaching certain degree to the distance of counter weight buffer up end under to, the car is crossed and is continued to go up behind the top end station, and is down to the counter weight, hits the board and can contact the buffer up end earlier to the counter weight down this moment, and the elevator has the potential safety hazard this moment, and limit switch has also lost the protective meaning of itself.

The elevator is in the upper landing level position as shown in fig. 1, when the car moves further upward for a distance h ₀ The limit switch is actuated, and in order to ensure the effectiveness of the limit switch, the distance h between the counterweight lower collision plate and the upper end surface of the counterweight buffer is required _x Within certain limits, namely: h is ₀ <h _x ≤H。

SUMMERY OF THE UTILITY MODEL

The utility model provides an elevator limit switch assists monitoring devices, its advantage is to hitting the board position under to heavy and carry out real-time supervision, can be with hitting the position restriction of board within the scope under to heavy to make the better performance of limit switch.

The above object of the utility model is realized through following technical scheme, an elevator limit switch assists monitoring devices, including photoelectric sensor and hold-in range, photoelectric sensor sets up on the elevator is to heavy installation frame, the photoelectric sensor level sets up, the vertical setting of hold-in range is bottom in the elevator pit, be equipped with the reflector panel of a plurality of equidistance intervals on the hold-in range, when the elevator to heavy down to the bottom time, photoelectric sensor is right the hold-in range is just right.

Through above-mentioned technical scheme, when the elevator is to heavy down to the hold-in range, photoelectric sensor is just right with the hold-in range, if the elevator is to heavy continuation down, photoelectric sensor will pass through a plurality of reflection of light piece, when photoelectric sensor passes through reflection of light piece, photoelectric sensor receives the reflection of light of reflection of light piece, consequently, the reflection of light number of times that accessible photoelectric sensor detected obtains the elevator to heavy continuation descending distance, can calculate from this when elevator car moves to the top layer, the elevator to heavy and to the distance h between the buffer board to heavy _x By judging h _x Whether or not h is satisfied ₀ <h _x H is less than or equal to the length of the steel wire rope, whether the length of the steel wire rope exceeds the allowable range or not can be obtained, then the elevator is overhauled, and the position of a counterweight down-striking plate is limited within the range, so that the limit switch can play a better role.

The utility model discloses further set up to, the both ends of hold-in range are equipped with the mount, and the mount is installed on the counterweight guide rail of elevator, the both ends of hold-in range are connected with the tensioning screw that passes the mount, are connected with the tensioning nut on the tensioning screw.

Through above-mentioned technical scheme, the hold-in range realizes vertical installation in the elevator gallery, sets up tensioning screw and tensioning nut and can make the hold-in range be in the tensioning state, avoids causing measurement accuracy to reduce because of the hold-in range distortion.

The utility model discloses further set up to, the interval of reflector panel is not more than 20mm on the synchronous belt.

Through the technical scheme, the accuracy grade of the distance for moving the elevator counterweight downwards detected by the photoelectric sensor is 20mm, and the requirement is basically met.

The utility model discloses further set up to, the level of reflection of light piece is not less than 50mm to the width.

Through above-mentioned technical scheme, guarantee hold-in range or elevator to heavy when taking place the vibration, photoelectric sensor's light can shine on the hold-in range.

The utility model discloses further set up to, its characterized in that, still including controller and alarm, photoelectric sensor's signal output part and control connection, the alarm is connected with the controller and is controlled by the alarm.

Through above-mentioned technical scheme, the controller receives photoelectric sensor's output signal and carries out the conversion, compares the data of surveying simultaneously, controls the alarm to report to the police when surpassing the scope of predetermineeing and infories elevator maintainer to overhaul.

The utility model discloses further set up to, the controller still is connected with wireless communication module.

Through the technical scheme, the wireless communication module is arranged for wireless communication and is used for notifying a maintainer or an elevator manager after a fault is detected.

To sum up, the beneficial effects of the utility model are that:

1. the safety performance of the elevator is improved, when the steel wire rope extends to a certain degree, the elevator can give an early warning, so that the protection function of the limit switch can be better exerted, potential safety hazards are avoided, and the safety performance is improved;

2. the device can effectively help maintenance personnel to manage the length of the steel wire rope, and can conveniently and timely cut the steel wire rope or disassemble a counter-weight down-striking plate, so that the maintenance personnel can conveniently monitor the change of the steel wire rope;

3. simple structure detects reliably, and this monitoring devices simple structure is reliable, and the debugging is simple easy, and simultaneously when the elevator inspection, only need pull out monitoring plug-in components, can just like normal inspection, safety, convenience, reliable.

Drawings

FIG. 1 is a schematic diagram of the position of the upper limit switch of the present invention;

FIG. 2 is a schematic diagram of a timing belt in the present invention;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is an enlarged view at B in FIG. 2;

FIG. 5 is a schematic diagram of a control relationship according to an embodiment of the present invention.

In the figure, 1, a steel wire rope; 2. a counterweight guide rail; 3. an upper limit switch; 4. An elevator counterweight; 5. a counterweight buffer; 6. a synchronous belt; 61. a light-reflecting sheet; 7. a photosensor; 8. an elevator car; 9. a fixed mount; 10. tensioning the screw; 11. and tensioning the nut.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

Example (b): referring to fig. 1-5, an auxiliary monitoring device for an elevator limit switch is used for auxiliary monitoring of the elevator limit switch, especially the upper limit switch 3, to ensure the protection function of the limit switch. The device includes photoelectric sensor 7 and hold-in range 6, photoelectric sensor 7 sets up on the elevator is to heavy 4 installation frame, photoelectric sensor 7 level sets up, the vertical setting of hold-in range 6 is bottom in the elevator pit, be equipped with a plurality of equidistance spaced reflection of light piece 61 on the hold-in range 6, when the elevator to down to the bottom to heavily, photoelectric sensor 7 is right hold-in range 6 is just right.

When the elevator is to heavy 4 down to hold-in range 6, photoelectric sensor 7 is just right with hold-in range 6, if the elevator continues down to heavy 4, photoelectric sensor 7 will pass through a plurality of reflection of light piece 61, photoelectric sensor 7 is when reflection of light piece 61, photoelectric sensor 7 receives the reflection of light of reflection of light piece 61, therefore, the number of times of reflecting light that accessible photoelectric sensor 7 detected reachs the elevator and continues down distance to heavy 4, the elevator is to heavy 4 and is going on down distance behind the position that enters into hold-in range 6 and be equal to the number of times of reflecting light that interval between the reflection of light piece 61 detected by photoelectric sensor 7. And can calculate the distance h between the elevator counterweight 4 and the counterweight buffer plate when the elevator car 8 runs to the topmost floor _x Assuming that the distance between the top end of the timing belt 6 and the counterweight buffer plate is H1, the distance for the elevator counterweight 4 to descend after entering the position of the timing belt 6 is H _y Then the distance h between the elevator counterweight 4 and the counterweight buffer plate _x = H ₁ -h _y . By judging whether hx satisfies h ₀ <h _x H is less than or equal to H, whether the length of the steel wire rope 1 exceeds the allowable range or not can be obtained, then the elevator is overhauled, and the position of a counterweight down-striking plate is limited within the range, so that the limit switch can better play a role. Particularly when the elevator is drivenThe service time increases, the steel wire rope 1 extends and becomes longer and longer, and when the elevator car 8 runs to the topmost floor, the distance h between the elevator counterweight 4 and the counterweight buffer plate _x Will get smaller and smaller until h _x ≤h ₀ At the moment, the upper limit switch 3 cannot play a safety protection role, the elevator should be overhauled, and the overhauling method mainly comprises two types of cutting the steel wire rope 1 or disassembling the counterweight lower collision plate. When the method of cutting the steel wire rope 1 is adopted for maintenance, the method can still be used for auxiliary monitoring after the elevator recovers to run. When the method for detaching the counterweight lower collision plate is adopted for maintenance, the position of the photoelectric sensor 7 is not changed at the moment, but the distance between the elevator counterweight 4 and the upper end face of the counterweight buffer 5 is increased, at the moment, a compensation quantity can be added to the distance hx between the elevator counterweight 4 and the counterweight buffer plate for processing, the compensation quantity is the thickness of the detached counterweight lower collision plate, the sign is negative, and then the method is continuously adopted for auxiliary monitoring.

The two ends of the synchronous belt 6 are provided with fixing frames 9, the fixing frames 9 are installed on a counterweight guide rail 2 of the elevator, the two ends of the synchronous belt 6 are connected with tensioning screws 10 penetrating through the fixing frames 9, and tensioning nuts 11 are connected to the tensioning screws 10. The synchronous belt 6 is vertically installed in an elevator tunnel, and the tensioning screw 10 and the tensioning nut 11 are arranged, so that the synchronous belt 6 is in a tensioning state, and the reduction of measurement precision caused by the distortion of the synchronous belt 6 is avoided.

The distance between the reflective sheets 61 on the synchronous belt 6 is not more than 20mm, and the accuracy grade of the distance of the downward movement of the elevator counterweight 4 detected by the photoelectric sensor 7 is 20mm, so that the requirement is basically met. The horizontal width of the reflector 61 is not less than 50mm, so that the light of the photoelectric sensor 7 can irradiate the synchronous belt 6 when the synchronous belt 6 or the elevator counterweight 4 vibrates.

The photoelectric sensor is characterized by further comprising a controller and an alarm, wherein the signal output end of the photoelectric sensor 7 is connected with the controller, and the alarm is connected with the controller and controlled by the alarm. The controller receives the output signal of photoelectric sensor 7 and carries out the conversion, compares the data of surveying simultaneously, and control the alarm to report to the police when surpassing preset range and inform elevator maintainer to overhaul, and the alarm selects the reputation alarm, and the controller selects 8 singlechips machines. The controller is also connected with a wireless communication module, and the wireless communication module is arranged for wireless communication and is used for notifying a maintainer or an elevator manager after a fault is detected.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and improvements can be made without departing from the inventive concept, and all of them belong to the protection scope of the present invention.

Claims

1. The utility model provides an elevator limit switch assists monitoring devices, its characterized in that, includes photoelectric sensor and hold-in range, photoelectric sensor sets up on the elevator is to heavy installation frame, the photoelectric sensor level sets up, the vertical setting of hold-in range is bottom in the elevator pit, be equipped with a plurality of equidistant spaced reflection of light pieces on the hold-in range, when the elevator to down to the bottom to the heavy, photoelectric sensor is right the hold-in range is just right.

2. The auxiliary monitoring device for the limit switch of the elevator as claimed in claim 1, wherein the two ends of the synchronous belt are provided with fixing frames, the fixing frames are installed on a counterweight guide rail of the elevator, the two ends of the synchronous belt are connected with tensioning screws penetrating through the fixing frames, and the tensioning screws are connected with tensioning nuts.

3. The elevator limit switch auxiliary monitoring device of claim 2, wherein the spacing of the reflectors on the synchronization belt is no greater than 20 mm.

4. The elevator limit switch auxiliary monitoring device according to claim 3, wherein the horizontal width of the reflector is not less than 50 mm.

5. The elevator limit switch auxiliary monitoring device according to any one of claims 1-4, characterized in that the device further comprises a controller and an alarm, the signal output end of the photoelectric sensor is connected with the controller, and the alarm is connected with the controller and controlled by the alarm.

6. The elevator limit switch auxiliary monitoring device of claim 5, wherein a wireless communication module is further connected to the controller.