Safety protection system for insufficient braking force of elevator brake

Abstract

The utility model discloses a safety protection system for insufficient braking force of elevator brakes. The safety protection system comprises an elevator control system, an operation contactor, a K5 contactor, a star sealing contactor, a traction machine, a left brake, a right brake, a left brake operation power supply feedback contactor, a right brake operation power supply feedback contactor, a control device and an acceleration sensor. A frequency converter of the elevator control system is in signal connection with a traction machine through an operation contactor and a K5 contactor, and a star sealing contactor is connected between the K5 contactor and the traction machine in parallel. The left brake and the right brake are arranged on the two sides of a brake wheel of the traction machine respectively, the elevator control system is connected with the signal input end of the control device through the left brake operation power source feedback contactor and the right brake operation power source feedback contactor, and the acceleration sensor is connected with the signal input end of the control device. The signal output end of the control device is connected with the left brake and the right brake. According to the utility model, casualty accidents can be prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to elevator safety technical field, concretely relates to a kind of safety protection system of elevator brake brake force deficiency. BACKGROUND

[0002] The brake of elevator is used for a long time, so that brake pad appears material friction loss, leading to brake brake force deficiency, to cause elevator car to appear coasting phenomenon, and speed is faster and faster, because part of static friction of elevator system is converted into kinetic friction, and the influence of moment of inertia, acceleration is also gradually larger, when elevator is squat bottom or rush top, i.e. car or counterweight impact bumper, acceleration is too large to cause personnel casualty accident, to avoid this casualty accident, present design is a kind of safety protection system of elevator brake brake force deficiency. UTILITY MODEL CONTENT

[0003] The utility model aims at providing a kind of safety protection system of elevator brake brake force deficiency, when coasting phenomenon appears, can make elevator car coasting according to preset acceleration, let elevator coasting with very low acceleration even stop coasting, to prevent the occurrence of personnel casualty accident.

[0004] The technical scheme of the utility model is as follows:

[0005] A kind of safety protection system of elevator brake brake force deficiency, including elevator control system, running contactor, K5 contactor, star-sealing contactor, traction machine, left brake, right brake, left brake running power feedback contactor, right brake running power feedback contactor, control device and acceleration sensor;

[0006] The elevator control system is equipped with frequency converter, and the frequency converter of the elevator control system is connected with the traction machine by running contactor and K5 contactor, and the star-sealing contactor is connected in parallel between K5 contactor and traction machine;

[0007] The left brake and right brake are respectively arranged at the brake wheel of traction machine, and the elevator control system is connected with the signal input end of control device by left brake running power feedback contactor and right brake running power feedback contactor respectively, the acceleration sensor is connected with the signal input end of control device, and the signal output end of control device is connected with left brake and right brake respectively.

[0008] Further, the left brake and right brake are all composed of fixed electromagnetic block, spring, brake block and guide shaft, the fixed electromagnetic block is equipped with guide hole slot, the brake block is movably arranged on the guide hole slot of fixed electromagnetic block by guide shaft and faces the brake wheel of traction machine, and the spring is installed in the guide hole slot of fixed electromagnetic block and its outer end is connected with brake block.

[0009] Further, the control device comprises an MCU, a K1 contactor, a K2 contactor, a K3 contactor and a K4 contactor, the MCU is respectively connected with the K1 contactor, the K2 contactor, the K3 contactor, the K4 contactor, the elevator control system and the acceleration sensor, the left brake operating power feedback contactor is connected with the left brake through the K1 contactor, the right brake operating power feedback contactor is connected with the right brake through the K2 contactor, the K3 contactor is connected in parallel between the left brake operating power feedback contactor and the K1 contactor, and the K4 contactor is connected in parallel between the right brake operating power feedback contactor and the K2 contactor.

[0010] Further, the safety protection system further comprises an emergency power supply, and the emergency power supply is connected with the power supply end of the frequency converter of the elevator control system.

[0011] Compared with the prior art, the utility model has the advantages that the system is composed of an emergency power supply, an elevator control system, an operating contactor, a K5 contactor, a star blocking contactor, a hoisting machine, a left brake, a right brake, a left brake operating power feedback contactor, a right brake operating power feedback contactor, a control device and an acceleration sensor, the frequency converter of the elevator control system is connected with the hoisting machine through the operating contactor and the K5 contactor, the star blocking contactor is connected in parallel between the K5 contactor and the hoisting machine, the elevator control system is connected with the signal input end of the control device through the left brake operating power feedback contactor and the right brake operating power feedback contactor, the signal output end of the control device is connected with the left brake and the right brake, the control device comprises an MCU, a K1 contactor, a K2 contactor, a K3 contactor and a K4 contactor, the MCU is respectively connected with the K1 contactor, the K2 contactor, the K3 contactor, the K4 contactor, the elevator control system and the acceleration sensor, the left brake operating power feedback contactor is connected with the left brake through the K1 contactor, the right brake operating power feedback contactor is connected with the right brake through the K2 contactor, the K3 contactor is connected in parallel between the left brake operating power feedback contactor and the K1 contactor, and the K4 contactor is connected in parallel between the right brake operating power feedback contactor and the K2 contactor. When the elevator is normally operated or fails, the elevator control system can transmit the acceleration of the elevator operation to the MCU of the control device in real time through can communication, if the control device finds that the acceleration of the elevator operation exceeds the set range, the K1 contactor, the K2 contactor and the K5 contactor are simultaneously disconnected, then the K3 contactor and the K4 contactor are connected, the power supply of the hoisting machine is removed, the power supply of the left brake and the right brake is reversely connected, and then the brake block can increase the friction between the brake wheel of the hoisting machine under the joint action of the spring thrust and the electromagnetic thrust, so that the elevator car can slide at the preset acceleration, the elevator can slide at a very low acceleration or even stop sliding, and the personnel casualty accident can be prevented. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Fig. 1 A system block diagram of a safety protection system for insufficient braking force of an elevator brake provided by this utility model;

[0014] Fig. 2 A circuit diagram of a safety protection system for insufficient braking force of an elevator brake provided by this utility model;

[0015] Fig. 3 A schematic diagram of a safety protection system for insufficient braking force of an elevator brake provided by this utility model;

[0016] Fig. 4 This is a schematic diagram showing the state of the left and right brakes of the present invention when the elevator is waiting;

[0017] Fig. 5 This is a schematic diagram showing the state of the left and right brakes described in this utility model during elevator operation.

[0018] Fig. 6 This is a schematic diagram showing the state of the left and right brakes of the present invention when the elevator is slipping. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] To illustrate the technical solution described in this utility model, specific embodiments are described below.

[0021] Example

[0022] Please see Figs. 1-3The embodiment provides a safety protection system for insufficient braking force of an elevator brake, which comprises an emergency power supply 10, an elevator control system 20, a running contactor 30, a K5 contactor 40, a star blocking contactor 50, a hoisting machine 60, a left brake 70, a right brake 80, a left brake running power supply feedback contactor 90, a right brake running power supply feedback contactor 100, a control device 110 and an acceleration sensor 120.

[0023] Wherein:

[0024] The elevator control system 20 is provided with a frequency converter 21, and the emergency power supply 10 is connected with a power supply end of the frequency converter 21 of the elevator control system 20.

[0025] The frequency converter 21 of the elevator control system 20 is connected with the hoisting machine 60 in signal mode through the running contactor 30 and the K5 contactor 40, and the star blocking contactor 50 is connected in parallel between the K5 contactor 40 and the hoisting machine 60.

[0026] The left brake 70 and the right brake 80 are arranged on both sides of a brake wheel 61 of the hoisting machine 60 respectively, the elevator control system 20 is connected with a signal input end of the control device 110 through the left brake running power supply feedback contactor 90 and the right brake running power supply feedback contactor 100 respectively, the acceleration sensor 120 is connected with the signal input end of the control device 110, and a signal output end of the control device 110 is connected with the left brake 70 and the right brake 80 respectively.

[0027] Specifically, the control device 110 comprises an MCU 111, a K1 contactor 112, a K2 contactor 113, a K3 contactor 114 and a K4 contactor 115, the MCU 111 is connected with the K1 contactor 112, the K2 contactor 113, the K3 contactor 114, the K4 contactor 115, the elevator control system 20 and the acceleration sensor 120 in signal mode, the left brake running power supply feedback contactor 90 is connected with the left brake 70 in signal mode through the K1 contactor 112, the right brake running power supply feedback contactor 100 is connected with the right brake 80 in signal mode through the K2 contactor 113, the K3 contactor 114 is connected in parallel on the left brake running power supply feedback contactor 90 and the K1 contactor 112, and the K4 contactor 115 is connected in parallel on the right brake running power supply feedback contactor 100 and the K2 contactor 113.

[0028] In combination Figs. 4-6As shown, the left brake 70 and the right brake 80 are each composed of a fixed electromagnetic block 71, a spring 72, a brake block 73 and a guide shaft 74, the fixed electromagnetic block 71 is provided with a guide hole groove, the brake block 73 is movably arranged on the guide hole groove of the fixed electromagnetic block 71 through the guide shaft 74 and faces the brake wheel 61 of the hoisting machine 60, and the spring 72 is installed in the guide hole groove of the fixed electromagnetic block 71 and its outer end is connected with the brake block 73. Fig. 4 It is a schematic diagram of the state of the left brake 70 and the right brake 80 when the elevator is waiting, at this time, the left brake 70 and the right brake 80 are not connected with power supply, and the brake block 73 forms a d1 gap under the pure pushing force of the spring 72; Fig. 5 It is a schematic diagram of the state of the left brake 70 and the right brake 80 when the elevator is running, the left brake 70 and the right brake 80 are connected with power supply, and the brake block 73 overcomes the pushing force of the spring 72 under the action of electromagnetic force, so that the brake block 73 is away from the brake wheel 61 of the hoisting machine 60 and forms a d2 gap; Fig. 6 It is a schematic diagram of the state of the left brake 70 and the right brake 80 when the elevator is coasting, after the left brake 70 and the right brake 80 are reversely connected with power supply, electromagnetic thrust appears, at this time, the spring thrust and the electromagnetic thrust jointly make the pushing force of the brake block 73 larger, a d3 gap (d3>d1>d2) is formed, so that the friction force between the brake block 73 and the brake wheel 61 of the hoisting machine 60 is greatly increased, and the braking force of the left brake 70 and the right brake 80 is enhanced.

[0029] When the elevator is normally running or is in failure, the elevator control system 20 transmits the acceleration of the elevator running to the MCU 111 of the control device 110 in real time through can communication, if the control device 110 finds that the acceleration of the elevator running exceeds the set range, firstly, the K1 contactor 112, the K2 contactor 113 and the K5 contactor 40 are simultaneously disconnected, then the K3 contactor 114 and the K4 contactor 115 are connected, the power supply of the hoisting machine 60 is removed, the brake block 73 of the left brake 70 and the right brake 80 is under the pushing force of the spring 72 and is in action, and after the power supply of the left brake 70 and the right brake 80 is reversely connected, the electromagnetic thrust is further used. The coasting acceleration can be preset in the control device 110, the size of the electromagnetic thrust is adjusted by adjusting the current of the brake, so that the size of the coasting acceleration is adjusted.

[0030] The above is only a preferred embodiment of the utility model, and is not used for limiting the utility model, any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection range of the utility model.

Claims

1. A safety system for protecting against inadequate braking force of an elevator brake, characterized in that The elevator control system, operation contactor, K5 contactor, star-sealing contactor, hoisting machine, left brake, right brake, left brake operation power feedback contactor, right brake operation power feedback contactor, control device and acceleration sensor are included. The elevator control system is provided with a frequency converter, the frequency converter of the elevator control system is connected with the hoisting machine through an operation contactor and a K5 contactor, and the star-sealing contactor is connected in parallel between the K5 contactor and the hoisting machine. The left brake and the right brake are arranged on the two sides of the brake wheel of the hoisting machine, the left brake operation power feedback contactor and the right brake operation power feedback contactor of the elevator control system are connected with the signal input end of the control device, the acceleration sensor is connected with the signal input end of the control device, and the signal output end of the control device is connected with the left brake and the right brake.

2. A safety system for protecting against inadequate braking of an elevator brake as defined in claim 1, characterized in that The left brake and the right brake are both composed of a fixed electromagnetic block, a spring, a brake block and a guide shaft, the fixed electromagnetic block is provided with a guide hole groove, the brake block is movably arranged on the guide hole groove of the fixed electromagnetic block through the guide shaft and faces the brake wheel of the hoisting machine, and the spring is arranged in the guide hole groove of the fixed electromagnetic block and connected with the brake block at the outer end.

3. The elevator brake under-run safety protection system of claim 1, wherein: The control device includes an MCU, a K1 contactor, a K2 contactor, a K3 contactor and a K4 contactor, the MCU is connected with the K1 contactor, the K2 contactor, the K3 contactor, the K4 contactor, the elevator control system and the acceleration sensor, the left brake operation power feedback contactor is connected with the left brake through the K1 contactor, the right brake operation power feedback contactor is connected with the right brake through the K2 contactor, the K3 contactor is connected in parallel between the left brake operation power feedback contactor and the K1 contactor, and the K4 contactor is connected in parallel between the right brake operation power feedback contactor and the K2 contactor.

4. The elevator brake under-run safety protection system of claim 1, wherein: The safety protection system further includes an emergency power supply, and the emergency power supply is connected with the power supply end of the frequency converter of the elevator control system.

Images