Elevator brake band-type brake synchronism detection device

Abstract

The utility model discloses an elevator brake band-type brake synchronism detection device which comprises an installation support, two band-type brake detection switches, a band-type brake synchronism detection loop and an alarm unit. The two band-type brake detection switches are mounted on a host housing of the elevator brake through the mounting bracket, respectively face two band-type brakes of the elevator brake, and are connected into the band-type brake synchronism detection loop; and when the triggering interval of the two band-type brake detection switches exceeds a preset value, the alarm unit is controlled to be electrified to work through the band-type brake synchronism detection loop. The device has the advantages that when the brake action time of the two sides of the elevator brake exceeds the set time, an alarm is given through the alarm unit, and related operators are prompted to take measures. The whole detection device is small and attractive, occupies a small space, can accurately detect the synchronism of the band-type brakes on the two sides of the brake, and can better guarantee the use safety of an elevator.

Description

Technical Field

[0001] The present application relates to the technical field of special equipment safety, and in particular to a device for detecting the synchronicity of an elevator brake. Background Art

[0002] The elevator drive main unit is connected to the car through a traction wire rope at one end and the counterweight at the other end, and runs up and down in the shaft. The door lock and safety circuit are closed, and the brake is opened after the floor selection signal is received, and the elevator will automatically run to the selected floor station. When the door lock is disconnected and the safety switch is disconnected, the brake is engaged and the elevator stops running. It can be seen that the brake is an extremely important safety component. It can be opened when the elevator is running, and it should be able to engage and complete braking when the door lock is disconnected, the safety circuit is disconnected, and the safety component is activated.

[0003] According to item 5.9.2.2.2.1 of GB / T 7588.1-2020 "Safety Specifications for Elevator Manufacturing and Installation Part 1: Passenger Elevators and Freight Elevators": All brake mechanical parts involved in applying braking force to the braking surface should be set in at least two groups. The purpose of setting in two groups is to increase the safety factor and reduce the probability of accidents. Therefore, the elevator brake is required to be flexible and the braking on both sides must be synchronized. If the brake is not debugged properly or due to jamming, the braking on both sides of the brake is not synchronized, which will accelerate the wear of the brake lining, reduce the braking ability, and easily cause slipping accidents. However, in reality, the maintenance and inspection of brake synchronization require people to feel through senses such as hearing and touching, which is inefficient and cannot squat on the brake for a long time for observation. Summary of the invention

[0004] The present application provides an elevator brake synchronism detection device, which has the advantage that when the action time of the brakes on both sides of the elevator exceeds the set time, an alarm is issued through the alarm unit, prompting relevant operators to take measures. The overall detection device is small and beautiful, occupies a small space, can more accurately detect the synchronism of the brakes on both sides, and can better ensure the safety of elevator use.

[0005] The above-mentioned object of the present application is achieved through the following technical scheme: an elevator brake synchronism detection device, comprising a mounting bracket, two brake detection switches, a brake synchronism detection circuit and an alarm unit; the two brake detection switches are mounted on the main housing of the elevator brake through the mounting bracket, the two brake detection switches face the two brake arms of the elevator brake respectively, and the installation positions of the two brake detection switches meet the following conditions:

[0006] When the elevator brake is open, the brake detection switch is not triggered and is in the off state;

[0007] When the elevator brake is engaged, the brake detection switch is triggered and is in the open state;

[0008] The two brake detection switches are connected to the brake synchronization detection circuit, and when the triggering interval of the two brake detection switches exceeds a preset value, the brake synchronization detection circuit controls the alarm unit to be energized and operate. The brake synchronization detection circuit includes: a time relay connected to the two brake detection switches respectively, a first intermediate relay connected to the time relay, and a second intermediate relay connected to the first intermediate relay. The second intermediate relay is used to control the alarm unit.

[0009] The present application is further configured such that the brake detection switch is a proximity switch, a micro switch, or a photoelectric switch.

[0010] The present application is further configured such that a scale is connected to the holding brake of the elevator brake, and a pointer pointing to the scale is provided on the mounting bracket.

[0011] The present application is further configured as follows: in the brake synchronization detection circuit, a brake detection switch and a time relay are connected in series and then connected to both ends of the synchronization detection circuit, the normally closed contact of a time relay is connected in series with the normally open contact of another time relay to form a two-way relay starting circuit, the two-way relay starting circuit is connected in parallel and then connected in series with the first intermediate relay to both ends of the synchronization detection circuit, the normally open contact of the first intermediate relay and the second intermediate relay are connected in series and then connected to both ends of the synchronization detection circuit, and the normally open contact of the second intermediate relay and the alarm unit are connected in series and then connected to both ends of the synchronization detection circuit.

[0012] The present application is further configured such that the power supply side of the second intermediate relay is also connected in series with the normally open contact of the second intermediate relay to form a self-locking circuit.

[0013] The present application is further configured such that a reset button SB1 is provided at the power supply end of the synchronization detection circuit, and the reset button SB1 is normally closed.

[0014] In summary, the beneficial effects of this application are:

[0015] 1. This application sets two brake detection switches and a brake synchronization detection circuit. When the action time of the brakes on both sides of the elevator exceeds the set time, an alarm is issued through the alarm unit to prompt relevant operators to take measures;

[0016] 2. The overall detection device is small and beautiful, takes up little space, and can accurately detect the synchronicity of the brakes on both sides, which can better ensure the safety of elevator use;

[0017] 3. When the action time of the elevator brake on both sides exceeds the set time, the alarm unit will give an alarm. The preset time is realized by the time relay, which does not require software implementation and has high reliability.

[0018] 4. This application can alarm when the brake synchronization deviation exceeds the set threshold, and the elevator can only run normally after stopping for inspection and resetting, thus saving a lot of manpower costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the installation position of an elevator brake synchronism detection device in a specific implementation mode of the present application;

[0020] Figure 2 yes Figure 1 A partial enlarged view of

[0021] Figure 3 is a schematic diagram of a brake synchronization detection circuit in a specific implementation mode of the present application;

[0022] Figure 4 It is a logic judgment flow chart of a brake synchronization detection circuit in a specific implementation manner of the present application.

[0023] In the figure, 1. manual brake release wrench; 2. push rod; 3. brake detection switch; 4. pointer; 5. ruler; 6. compression spring; 7. pull rod; 8. pull rod locking nut; 9. brake shoe; 10. brake shoe adjustment screw; 11. adjustment nut; 12. mounting bracket. DETAILED DESCRIPTION

[0024] The specific implementation of the present application is described in detail below with reference to the accompanying drawings.

[0025] Embodiment: An elevator brake synchronism detection device comprises a mounting bracket, two brake detection switches, a brake synchronism detection circuit and an alarm unit.

[0026] In this embodiment, a typical elevator brake is used for illustration. Figure 1-2 As shown, the elevator brake includes a manual brake release wrench 1, a push rod 2, a compression spring 6, a pull rod 7, a pull rod locking nut 8, a brake shoe 9, a brake shoe adjustment screw 10 and an adjustment nut 11.

[0027] The working process of the elevator brake is as follows: when the elevator stops, the electromagnet loses power, and the brake, under the action of the compression spring, causes the brake to clamp the brake wheel to complete the holding brake; when the elevator is running, the electromagnet is energized to release the brake and the top rod is pushed to both sides. At this time, the electromagnetic force overcomes the spring force of the brake spring to complete the opening of the brake.

[0028] When the brake is opened, the gap between the brake lining and the brake wheel surface is between 0.2 and 0.7 mm. The thickness of the brake lining is about 6 mm, and it should be replaced in time when the wear exceeds 2 mm.

[0029] Under the compression force of the compression spring, the brake arm is pressed against the brake wheel surface. The brake wheel surface should be smooth and free of oil stains, and the brake should be tightly engaged.

[0030] When the brake electromagnet is powered on or off, it will be attracted and disconnected, driving the brake release wrench to rotate to complete the opening and holding of the brake. At this time, the push rod moves left and right.

[0031] refer to Figure 1-2 The two brake detection switches 3 are installed on the main housing of the elevator brake through the mounting bracket 12. The two brake detection switches 3 face the two brake arms of the elevator brake respectively. The installation positions of the two brake detection switches meet the following conditions:

[0032] When the elevator brake is open, the brake detection switch is not triggered and is in the off state;

[0033] When the elevator brake is engaged, the brake detection switch is triggered and is in the open state.

[0034] The brake detection switch is a proximity switch, a micro switch or a photoelectric switch.

[0035] In a preferred embodiment, the gap between the brake detection switch and the brake arm is about 15 to 25 mm. In order to facilitate the adjustment of the gap between the brake detection switch and the brake arm, Figure 2 As shown in the figure, a scale is connected to the brake arm of the elevator brake, and a pointer pointing to the scale is provided on the mounting bracket. The pointer and the scale cooperate to adjust the gap of the brake detection switch, and the gap between the detection switches and the brake arm on the left and right sides is adjusted by the position of the pointer on the scale.

[0036] The brake should be adjusted first. After the brake clearance and action are consistent, adjust the clearance between the brake detection switch and the brake arm using the pointer and ruler.

[0037] The brake detection switch is a safety contact, which is connected to the safety circuit and the brake synchronization detection circuit. The wire connection is an electrical connection. In order to ensure mechanical strength, the wire cross-sectional area should not be less than 0.75mm 2 .

[0038] The two brake detection switches are connected to a brake synchronization detection circuit, and when the triggering interval of the two brake detection switches exceeds a preset value, the alarm unit is powered on and operated through the brake synchronization detection circuit.

[0039] like Figure 3As shown, the brake synchronization detection circuit includes two brake detection switches, two time relays, a first intermediate relay KA1 and a second intermediate relay KA2. A brake detection switch and a time relay are connected in series and connected to both ends of the synchronization detection circuit. The normally closed contact of a time relay is connected in series with the normally open contact of another time relay to form a two-way relay starting circuit. The two-way relay starting circuit is connected in parallel and then connected in series with the first intermediate relay to both ends of the synchronization detection circuit. The normally open contact of the first intermediate relay and the second intermediate relay are connected in series and then connected to both ends of the synchronization detection circuit. The normally open contact of the second intermediate relay and the alarm unit are connected in series and then connected to both ends of the synchronization detection circuit.

[0040] The power supply side of the second intermediate relay is also connected in series with the normally open contact of the second intermediate relay to form a self-locking circuit. A reset button SB1 is provided at the power supply end of the synchronization detection circuit, and the reset button SB1 is normally closed.

[0041] Figure 3 It also includes an elevator stop signal switch SB0, an elevator start signal switch SB2, an elevator motor KM1, and a brake coil YB.

[0042] ①When the elevator is running, the brake is open. The elevator runs up and down. The brake detection switches SQ1 and SQ2 are disconnected, and the corresponding relays are disconnected. (The start signal in the figure is SB2)

[0043] ②When the elevator reaches the floor and the door opens or the safety circuit is disconnected, the brake is closed and the elevator is locked. (The stop signal is SB0)

[0044] ③ The left and right brakes are in action. When the elevator brakes are applied, the brake detection switches on the left and right sides are activated. The normally open points of the brake detection switches SQ1 / SQ2 on the left and right sides are closed, and the time relay KT1 / KT2 is turned on. The time relay starts timing.

[0045] ④ The time for the other brake to reach the brake is calculated from the time point of the brake that reaches the brake first. Figure 4 , within the set time threshold, the second brake holds the brake, and the equipment operates normally. If it exceeds the set range, the time relay that reaches the brake first excites the first intermediate relay KA1, and the first intermediate relay KA1 starts the second intermediate relay KA2. The second intermediate relay KA2 is normally open and closed to self-lock, and the alarm unit is turned on at the same time. The alarm unit uses an audible and visual alarm to give an audible and visual alarm.

[0046] ⑤ After the second intermediate relay KA2 is turned on, the alarm continues. If a reset is required, it is necessary to manually confirm that there is no safety hazard in the brake, then press the reset button SB1 to release the alarm and restore.

[0047] For example: If the allowed synchronization error of the brake is set to 0.5 seconds. When the left brake arrives first, the brake detection switch SQ1 is normally open and closed, and the time relay KT1 is started. The time relay KT1 starts timing. If the second brake arrives within 0.5 seconds, the brake detection switch SQ2 is stimulated, SQ2 is normally open and closed, and the time relay KT2 is started. The time relay KT2 starts timing. When the KT2 timing ends, KT2 acts, and the KT2 normally closed in series in the KT1 circuit is disconnected, cutting off the power supply of the first intermediate relay KA1 that KT1 stimulates. The brake operates normally. If KT2 arrives more than 0.5 seconds later and the power supply of KT1 cannot be cut off in time, KT1 will connect the first intermediate relay KA1. The first intermediate relay KA1 will connect the sound and light alarm to keep the second intermediate relay KA2, and send out an alarm signal.

[0048] In addition: The time relay can be accurate to 0.36 seconds, and the existing time relay can achieve a timing time of 0.36 seconds.

[0049] Combined with the action principle of the elevator brake, it can be known that the factors of the elevator brake asynchronism detected by the elevator brake synchronization detection device mentioned in this embodiment mainly come from three aspects: one is the travel distance of the brake detection switch contacts, the second is the distance between the brake detection switch and the brake arm, and the third is the mechanical debugging factor of the brake. In fact, the brake detection switches on both sides use the same specifications and models, and the travel distance of the brake detection switch contacts can be approximately regarded as consistent; when we control the distance between the brake detection switch and the brake arm through the pointer and ruler, the detection effect caused by the different distances between the brake detection switch and the brake arm can be reduced. Therefore, in summary, the elevator brake synchronization detection device mentioned in this embodiment detects that the brake asynchronism mainly comes from mechanical debugging problems. At this time, relevant personnel are required to debug the brake synchronization on both sides of the brake.

[0050] The above is only a preferred implementation of the present application. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present application, and these all fall within the scope of protection of the present application.

Claims

1. An elevator brake holding brake synchronization detection device, characterized in that: It includes a mounting bracket, two brake detection switches, a brake synchronization detection circuit and an alarm unit; the two brake detection switches are mounted on the main housing of the elevator brake through the mounting bracket, the two brake detection switches face the two brake arms of the elevator brake respectively, and the installation positions of the two brake detection switches meet the following conditions: When the elevator brake is open, the brake detection switch is not triggered and is in the off state; When the elevator brake is engaged, the brake detection switch is triggered and is in the open state; The two brake detection switches are connected to the brake synchronization detection circuit, and when the triggering interval of the two brake detection switches exceeds a preset value, the brake synchronization detection circuit controls the alarm unit to be energized and operate. The brake synchronization detection circuit includes: a time relay connected to the two brake detection switches respectively, a first intermediate relay connected to the time relay, and a second intermediate relay connected to the first intermediate relay. The second intermediate relay is used to control the alarm unit.

2. The elevator brake holding synchronization detection device according to claim 1, characterized in that: The brake detection switch is a proximity switch, a micro switch or a photoelectric switch.

3. The elevator brake holding synchronization detection device according to claim 1, characterized in that: A scale is connected to the holding brake of the elevator brake, and a pointer pointing to the scale is provided on the mounting bracket.

4. The elevator brake holding synchronization detection device according to claim 1, characterized in that: In the brake synchronization detection circuit, a brake detection switch and a time relay are connected in series and connected to both ends of the synchronization detection circuit, the normally closed contact of a time relay is connected in series with the normally open contact of another time relay to form a two-way relay starting circuit, the two-way relay starting circuit is connected in parallel and connected in series with the first intermediate relay to both ends of the synchronization detection circuit, the normally open contact of the first intermediate relay and the second intermediate relay are connected in series and connected to both ends of the synchronization detection circuit, and the normally open contact of the second intermediate relay and the alarm unit are connected in series and connected to both ends of the synchronization detection circuit.

5. The elevator brake holding synchronization detection device according to claim 4, characterized in that: The power supply side of the second intermediate relay is also connected in series with the normally open contact of the second intermediate relay to form a self-locking loop.

6. The elevator brake holding synchronization detection device according to claim 5, characterized in that: A reset button SB1 is provided at the power supply end of the synchronization detection circuit, and the reset button SB1 is normally closed.

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