CN201834629U

CN201834629U - Overload protecting device for impact load resisting construction lifter

Info

Publication number: CN201834629U
Application number: CN2010205392247U
Authority: CN
Inventors: 倪建军
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-09-25
Filing date: 2010-09-25
Publication date: 2011-05-18
Anticipated expiration: 2020-09-25

Abstract

The utility model discloses an overload protecting device for an impact load resisting construction lifter, which comprises a force measuring sensor, an acceleration measuring sensor and a signal measuring and controlling circuit. The force measuring sensor is installed on a lifting lug between a transmission plate and a lifting cage or is installed between the transmission plate and a fixed frame of the transmission plate; the acceleration measuring sensor is installed at the position where the running acceleration of the lifting cage can be measured; the signal measuring and controlling circuit is installed in an electric cabinet of the lifter or is independently fixed on the lifting cage of the lifter; the output ends of the force measuring sensor and the acceleration measuring sensor are respectively connected to the signal measuring and controlling circuit, and control contacts in the signal measuring and controlling circuit are connected into a control loop of the lifter. The overload protecting device has the following characteristics: the impact on the overload protecting device by impact load is eliminated; the overload protecting device completely eliminates the problem that the lifter is shut down by mistake due to the impact load and then cannot normally work,; in addition, the comprehensive performance of the overload protecting device is perfected and the running safety is improved.

Description

A kind of construction lifter excess load fender guard of resistance to shock loads

Technical field:

The utility model relates to technical field of engineering machinery, is specifically related to a kind of overload protection device of building hoist.

Background technology:

Building hoist is the large-scale implement of building ground, it mainly acts on is vertical transport build labourer and small-sized material in high building is built, continuous development along with building industry, skyscraper is more and more, the consumption of building hoist is also increasing, but the safety misadventure that is accompanied by also happens occasionally, and the whole nation is annual all to have a lot of particularly serious accidents that have personal injury to take place.From all analysis on accident cause results, the lifter excess load operation is an assignable cause.

Overload protection device for building hoist, domestic had nearly 10 years research and development history, several years ago, the relevant pressure standard of country has emphasized that also all building hoists that dispatch from the factory must dispose overload protection device, because the increase of use amount, manufacturer has developed into family more than 10 at present, the principle of product and version are all similar, force transducer has two kinds of mounting meanss: a kind of is that the pin type sensor is contained between driver plate and the cage, second kind is that force transducer is installed between driver plate and the driver plate fixed frame, except the force transducer with this dual mode detects the overall weight of cage, also through amplifying, signal processing circuit judges whether the load of cage overloads, if overload has taken place, provide acousto-optic hint, provide the control loop power supply that on-off signal cuts off elevator simultaneously; After the load of cage reduced to certain value, the on-off signal of device resetted, and elevator can normally move again.After overload protection device is assembled on the building hoist, improved the safety in operation of China's elevator, reduced the serious accident that causes by overload, shortened gap with the advanced product in the world.

Yet; all also there is the problem on using in present construction lifter excess load fender guard in practice; such as in elevator startup and operational process; cage can produce impact load; this load is superimposed upon and can makes the overload system produce erroneous judgement on the sensor; its phenomenon is: under static state; overload does not appear in cage; elevator can normally start; yet; owing to start in the accelerator and can produce additional impact load; and this increment load acts on the sensor after together with the actual load addition; can make the load value of overload protection device reflection be far longer than the actual load of cage; after numerical value surpasses the overload protection value; system will carry out power-off protection; make elevator stop operation; actual situation is exactly; the lifting function starts; but start-up course does not also finish just outage fully shuts down; and; promptly enable normal startup, but in operational process, can produce some vibrations inevitably; this shakes once in a while and also can make overload protection device erroneous judgement occur; and elevator is stopped in the air, this phenomenon often takes place, in most cases; the operator can normally move in order to make equipment; the protection node of short circuit overload protection device artificially of having to makes it ineffective, and this has brought major hidden danger for safe operation of building hoist.

The utility model content:

Technical problem to be solved in the utility model is: solve the problem that above-mentioned prior art exists, and provide a kind of impact load of eliminating to the influence of overload protection device, stop owing to the phenomenon of the elevator mistakenly stop machine that impact load is brought, cisco unity malfunction, improve the overload protection device Combination property, improve the construction lifter excess load fender guard of the resistance to shock loads of safety in operation fully;

The technical solution adopted in the utility model is: the construction lifter excess load fender guard of this resistance to shock loads, comprise force transducer, acceleration analysis sensor, signal telemetry circuit, force transducer is installed on the hanger between driver plate and the cage, perhaps is installed between driver plate and its fixed frame; The acceleration analysis sensor is installed in the place of energy measurement cage operation acceleration/accel, the signal telemetry circuit be installed in the electric cabinet of elevator or independent stationary on elevator craning cage; The output of force transducer and acceleration analysis sensor all is connected to the signal telemetry circuit.

In the technique scheme, the control contact in the signal telemetry circuit is connected in the control loop of elevator, and the display part in the signal telemetry circuit can be installed on this machine, also can externally show.

In the technique scheme, the acceleration analysis sensor can be the fixing acceleration pick-up of mechanical system, can also be the acceleration analysis element of welded and installed on printed circuit board (PCB).

In the technique scheme, the signal telemetry circuit comprises bonded assembly signal conditioning circuit, arithmetic control circuit, relay circuit, control contact and display unit and uninterrupted power supply (UPS) successively.

In the technique scheme, force transducer is 3 tons of force transducers of pin type that Ningbo Ke Li company produces, and acceleration pick-up is the MMA7455 type acceleration pick-up that U.S.'s Freescale (FREESCLE) company produces.

Acceleration pick-up is integrated circuit form encapsulation, and directly welded and installed is on printed circuit board (PCB), and the utility model embodiment is exactly that welded and installed is on the printed circuit board (PCB) of telemetry circuit.

In the technique scheme, the output of arithmetic control circuit or connection host side wireless receiving Power Generation Road, host side wireless transceiver circuit and display end wireless transceiver circuit carry out radio communication, and the output of display end wireless transceiver circuit connects display unit.

Working process of the present utility model is such:

When cage remains static, just acceleration/accel is under zero the situation, the output of acceleration analysis sensor also is null value, force transducer will obtain and cage actual weight electric signal one to one, this signal is sent in the signal telemetry circuit, at first finish the amplification of signal condition, filtering and corresponding level translation function, then after the numerical value peeling of arithmetic control circuit heavily waits computing, send telltale to show current actual load on the one hand, compare with the overload storing threshold on the one hand,, show that this moment, cage did not overload if do not surpass threshold values, keep the control contact closure, light corresponding state indication; If the data that this moment, sensor recorded surpass the overload threshold values, show that then cage overloads this moment, telemetry circuit will disconnect control contact, cut off the elevator control circuit, stop elevator to start operation, and provide corresponding sound and light alarm prompting, demonstrate cooresponding demonstration and acousto-optic hint under the overload condition this moment, reduce in the normal range up to cage load, elevator could normally start operation.

When cage is in startup and the operational process; cage is bound to be attended by acceleration/accel and produces; the acceleration analysis sensor will have value corresponding output; simultaneously; the numerical value that force transducer obtains also will be the increment load sum that cage static weight and acceleration/accel produce; accekeration is big more; the increment load that acts on the sensor will be big more; the signal that degree of will speed up survey sensor is sent here is made suitable transformation of coefficient; make the increment load signal amplitude basically identical in its size and the force transducer signal; after the digitalisation conversion, be sent in the telemetry circuit CPU again with the signal subtraction of force transducer; at this moment; the incoming signal of telemetry circuit is exactly to have eliminated the acceleration/accel increment load and the basic signal value consistent with the cage static weight; can carry out with the cage quiescence under same process; realize the overload protection function of elevator in motion process, avoided making overload protection device misoperation occur owing to the vibrations of generation in service.

Outstanding feature of the present utility model and technique effect:

Compare with the construction lifter excess load fender guard of present employing, the utility model can increase substantially the resistance to shock loads ability of overload protection device in elevator startup and operational process, has improved the safety of elevator operation.Present construction lifter excess load fender guard in actual use; for fear of the influence of impact load to normal operation; be the artificial short circuit of control contact in most cases; make overload protection device be in entirely ineffective state; this is very dangerous, has major safety risks, after the utility model adopts the shock resistance measure; just stop the generation of this kind situation fully, improved elevator reliability of operation and safety.

Description of drawings

Fig. 1 is the utility model embodiment 1 structure principle chart

Fig. 2 is the utility model embodiment 2 structure principle charts

Fig. 3 is the utility model embodiment 3 structure principle charts

Figure labeling description:

1---force transducer 2---signal conditioning circuit

3---arithmetic control circuit 4---host side wireless transceiver circuit

5---display end wireless transceiver circuit 6---display unit

7---uninterrupted power supply (UPS) loop 8---telemetry circuit

9---acceleration analysis sensor 10---relay circuit

11---control contact

Fig. 4 is the utility model signal conditioning circuit electrical schematic diagram

Fig. 5 is the utility model signal acceleration analysis sensor electrical schematic diagram

Fig. 6 is the utility model arithmetic control circuit schematic diagram

Fig. 7 is the utility model host side wireless transceiver circuit schematic diagram

Fig. 8 is the utility model display end wireless transceiver circuit schematic diagram

Fig. 9 is the utility model display unit circuit schematic diagram

Figure 10 is the utility model uninterrupted power supply circuit schematic diagram

The specific embodiment:

Referring to Fig. 1, Fig. 2, Fig. 3, the utility model includes force transducer 1, acceleration analysis sensor 9 and telemetry circuit 9 etc. and partly constitutes, and telemetry circuit 9 partly is made of signal conditioning circuit 2, arithmetic control circuit 3, host side wireless transceiver circuit 4, display end wireless transceiver circuit 5, display unit 6, uninterrupted power supply (UPS) loop 7 etc.Force transducer 1 is installed on the hanger between building hoist driver plate and the cage, perhaps is installed between driver plate and its fixed frame, and acceleration analysis sensor 9 can be installed in can measure cage operation acceleration/accel Anywhere, on cage.

When cage is static, acceleration analysis sensor 9 is output as initial zero, force transducer 1 is used to measure the actual load of cage and obtains and cage weight electric signal one to one, the signal that signal condition loop 2 is just sent here sensor is through amplifying, output to s operation control loop 3 after filtering and the level conversion, the threshold values that overloads is judged, when data surpass the overload threshold values, open control contact, make elevator stop operation, send cooresponding alert data to give Tip element 6, provide suitable acousto-optic hint, simultaneously alert data is sent to host side wireless receiving and dispatching loop 4; When data do not surpass the overload threshold values, control contact is kept closure state, simultaneously send main frame wireless receiving and dispatching loop 4 data, display unit 6 from the data of coming in display end wireless receiving and dispatching loop 5 after the conversion of necessity, offer display unit 6 and show corresponding datas.

When cage is in startup and the operational process; cage is bound to be attended by acceleration/accel and produces; acceleration measurement unit 9 will have value corresponding output; simultaneously; the numerical value that force transducer 1 obtains also will be the increment load sum that cage static weight and acceleration/accel produce; accekeration is big more; the increment load of effect will be big more on the force transducer 1; the signal that degree of will speed up measuring unit 9 is sent here is made suitable transformation of coefficient; make the increment load signal amplitude basically identical in its size and force transducer 1 signal; after the digitalisation conversion, be sent in the telemetry circuit 8 CPU again with the signal subtraction of force transducer 1; at this moment; telemetry circuit 8 is exactly to have eliminated the acceleration/accel increment load and the basic signal value consistent with the cage static weight with the incoming signal that gets; can carry out with the cage quiescence under same process; realize the overload protection function of elevator in motion process, avoided making the maloperation of overload protection device appearance owing to the vibrations of generation in service.

Uninterrupted power supply (UPS) loop 7 is made of battery and control circuit, and when civil power, control circuit directly offers device to the required direct supply of civil power alternative cost device and uses, and judges also that simultaneously whether battery needs charging, as needs, must charge to it; When no civil power, control circuit will be powered to device after certain conversion by battery.

A specific embodiment of the present utility model arrives Figure 10 referring to Fig. 4:

Fig. 4 is the specific embodiment of signal conditioning circuit 2, the millivolt signal that sensor signal is come is after IC1 amplifies, by IC2 filtering, adjust level by IC3 again and send IC4 to carry out the A/D conversion, by IC4 output and sensor signal digital signal one to one to suitable level state.That acceleration measurement unit of the present utility model 9 shown in Figure 5 is selected is the IC16 that can be welded on the printed circuit board (PCB), and its output is and the corresponding digital signal of cage acceleration/accel.

Fig. 6 is the specific embodiment of arithmetic control circuit 3, nurse one's health cage load and the acceleration/accel digital signal that the loop is sent here by micro controller system IC5 received signal, constitute center processing unit by IC5, IC6, IC7, IC7, IC8, finish tare weight, overload threshold values comparison, send demonstrations, parameter to store and the work of driving switch amount.

When cage is in when static, the acceleration signal that micro controller system IC5 receives is an initial zero, when in the operational process acceleration/accel being arranged, the acceleration signal that micro controller system IC5 receives is with non-vanishing, in micro controller system IC5, at first the numerical value that force transducer 1 is sent here deducts the value of acceleration measurement unit 9, and then the overload threshold values compares together, if do not surpass threshold values, show that this moment, cage did not overload, keep control contact K closure, light the corresponding state indicator lamp in the L loop, and the data of current data with the last time are compared, when the data variation amount reaches preset value, just preserve this secondary data and current time, simultaneously these data and other work condition state are mail to host side wireless receiving and dispatching loop 4 by IC8 together by IC9;

After if the data that this moment, sensor recorded surpass the overload threshold values, show that then cage overloads this moment, to store current time and overload condition by IC9, disconnect control contact K simultaneously, cut off the elevator control circuit, stop elevator to start operation, and provide corresponding sound and light alarm prompting, and deliver to host side wireless receiving and dispatching loop 4 through the IC8 alert display data of delivering newspaper by the L loop.

Fig. 7 is the embodiment of host side wireless transceiver circuit 4, Fig. 8 is the embodiment of display end wireless transceiver circuit 5, its wireless communication mode is an infrared-ray communication, two circuit diagrams are just the same, produce the modulating frequency of the infrared emission of 38K by IC10, when incoming signal is high level, the infrared pulse signal of 38K will externally be launched, when signal is low level, no infrared signal output, IC11 is infrared receiving unit, when receiving the infrared signal of accepting 38K, being output as high level, is low level during no signal.This embodiment is the bidirectional transmit-receive function, and display end wireless receiving and dispatching telegram in reply road 5 is except the data that can accept host side wireless transceiver circuit 4 and send, and host side wireless receiving and dispatching loop 4 also can receive the data that send in display end wireless receiving and dispatching loop 5.

Fig. 9 is the specific embodiment of display unit 6, and the data that IC13 acceptance is sent here by display end wireless receiving and dispatching loop 5 among the figure after conversion process, send display device to show the current load condition of elevator through IC12.

Figure 10 is the specific embodiment in uninterrupted power supply (UPS) loop 7, when having civil power to insert, is powered to device by civil power, and is when no civil power, battery-powered.Wherein the process of charging of IC14 management battery arrives certain value when cell pressure is low, and the IC14 output low level is charged the battery by civil power, and IC14 exports high level to certain value when cell pressure is high, and charging finishes; IC15 is the powered battery control circuit, when no civil power, and the IC15 output low level, the relay J action is installed battery-powered; When cell pressure hanged down to certain value, IC15 exported high level, and relay J disconnects, and stopped the device power supply, and its purpose is protected battery; Behind civil power, IC15 exports high level, and relay J disconnects, and directly to device powered by civil power this moment.

Claims

1. the construction lifter excess load fender guard of a resistance to shock loads comprises force transducer, telemetry circuit, it is characterized in that having additional the acceleration analysis sensor, and the measurement signal of force transducer and the output of acceleration analysis sensor all is connected to telemetry circuit.

2. the construction lifter excess load fender guard of resistance to shock loads according to claim 1 is characterized in that: the acceleration analysis sensor is fixing acceleration pick-up or the acceleration analysis element of welded and installed on printed circuit board (PCB) of mechanical system.