CN2131844Y

CN2131844Y - Alarm device for crane mounted on vehicle

Info

Publication number: CN2131844Y
Application number: CN 92219914
Authority: CN
Inventors: 范林涛
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-29
Filing date: 1992-09-29
Publication date: 1993-05-05
Anticipated expiration: 2002-09-29

Abstract

The utility model relates to an overturn prevention accident alarm device for a crane mounted on a vehicle, which is composed of a starting circuit which is connected with a logical recognition circuit, a shutting down circuit, a time delay circuit and an executive element. The alarm device for a crane mounted on a vehicle is characterized in that a sensor is installed on a support leg of the crane mounted on a vehicle, and the sensor is connected with the logical recognition circuit. The utility model has reliable performance, simple installation and low cost. The alarm device for a crane mounted on a vehicle can not only effectively avoid the accident that the crane mounted on a vehicle tips over while overloading, but also alarm under the conditions that a hung object is oblique, the support leg retracts, the support leg sinks, an accessional moment is generated because of strong wind, etc. The alarm device for a crane mounted on a vehicle is an imperative device for a current crane mounted on a vehicle.

Description

Alarm device for crane mounted on vehicle

The utility model relates to a kind of warning device that can prevent that the car hosit overthrow accident from taking place.

Elevator machinery is dangerous bigger production facilities, and accident rate is higher.And the car hosit accident rate accounts for first of all kinds of weight-lifting equipment accidents.The major cause that car hosit has an accident is exactly the weight under estimate of operating personal to hoisting heavy, surpasses that the rated moment lifting causes, and tends to make car load to tumble, and causes the serious consequence of car crash.At present, the external limiter of moment that on the car hosit more than 16 tons, all is equipped with, its principle is: sensor is installed on the arm, or on the amplitude oil cylinder, by measuring length or the angle that armed lever stretches out, and hoisting weight, data are sent into computer, by analog quantity or analogue to digital conversion, carry out computing and comparison, last control actuating component is carried out.Homemade large-tonnage car hosit has only a few part to be equipped with this device.This installation cost height can only prevent owing to the overthrow accident that causes of lifting, and home products quality instability at present, is difficult to large tracts of land and promotes, and particularly is difficult to especially realize on the car hosit below 16 tons.Therefore, in production reality, overthrow accident takes place again and again.

The purpose of this utility model provides a kind of dependable performance, cost is low, simple installation, overthrow accident in the time of preventing to overload lifting effectively, but also can prevent to cause the anti-warning device that turns over of the car hosit of tumbling tiltedly hanging, supporting leg retraction, supporting leg sink, strong wind produces additional overturning moment etc. under the situations.

The utility model is made up of the boot-strap circuit, shutdown circuit, time delay circuit and the power element that are connected with the logic identification circuit, it is characterized in that sensor is installed on the car hosit supporting leg, and is connected with the logic identification circuit.

The logic identification circuit be by or gate logic and AND gate be formed in parallel; Time delay circuit is by aerotron V ₃With with V ₃Base stage bonded assembly capacitor C ₁Form; Power element is a buzzer phone; Boot-strap circuit is by S ₁-S ₄VS forms with the triggering silicon control; Shutdown circuit is by diode VD ₅, aerotron V ₁And relay K ₁And silicon control VS forms.

The utility model compared with prior art has:

1, dependable performance, cost are low, are 1/tens of existing limiter of moment costs, and simple installation is adapted at using on various types of car hosits.

2, can prevent from effectively to cause overthrow accident to take place tiltedly hanging, supporting leg retraction, supporting leg sink, strong wind produces additional overturning moment etc. under the situations.

3, the utility model can be worked automatically, does not need artificial intervention fully, and carries out self check automatically before each work, does not exist in the use because of tumbling that cause wrong gear selecting position.

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is the utility model sensor installation site scheme drawing;

Fig. 2 is the utility model schematic circuit diagram;

Fig. 3 is a block scheme of the present utility model;

Among the figure: S₁－S ₄Be installed in respectively on four supporting legs of autocrane. When normal lifting, load is born by each supporting leg. When the overload lifting, because center of gravity is offset to the lift heavy aspect, the supporting leg of its offside will become flexible, and produces the gap. Be just to produce the gap between the end face of movable supporting legs 1 and the fixed supporting leg 2, the contact in the sensor 3 disconnects, and control circuit will send chimes of doom.

In Fig. 2, S₁－S ₄Be respectively the sensing switch of 4 supporting legs, S₁－S ₄Be connected with the logic identification circuit that " with door " composes in parallel with disjunction gate respectively, namely by R₁－R ₈And VD₁－VD ₄The logic identification circuit that forms is connected. When autocrane was opened supporting leg, after supporting leg had landed and had earlier, the sensing switch of the supporting leg that lands earlier was at first closed, triggered controllable silicon VS conducting by the switch common port, made the complete machine energising, and circuit is started working. At this moment high electricity The flat VD that passes through₁－VD ₄Form or gate logic makes V₂、V ₃Conducting, relay K₂Adhesive, executive component buzzer HA sends the sound, proves that circuit working is normal. When 4 supporting legs of autocrane all prop up S₁－S ₄All closed, VD₁－VD ₄Anodal high-fall be low level, V₂、V ₃Cut-off, buzzer HA stops to ring, and self check all finishes, and circuit enters duty.

In autocrane work, no matter be that the supporting leg that overload causes becomes flexible, or the arbitrary supporting leg that causes because of situations such as supporting leg sink, strong wind produces additional tilting moment becomes flexible corresponding S₁－S ₄Switch just disconnect VD₁－VD ₄Middle certain corresponding positive pole will become high level, makes V₂、V ₃Conducting, relay K_2－1Adhesive, buzzer HA reports to the police, thereby reminds operating personnel to safe direction operation, as put down weight, contracting arm, the luffing etc. that makes progress, avoid the generation of tipping car accident. Interrupted warning for the shake of eliminating the supporting leg sensing switch and temporary impact cause has increased C in circuit₁With V₃The delay circuit that forms. After autocrane was got back to safe condition, the supporting leg sensing switch was once more closed, thereby makes K_2－1Disconnect the buzzer stop alarm.

When autocrane work is complete pack up supporting leg after, S₁－S ₄All disconnect, pass through R₅－R ₈And VD₁－VD ₄The ANDgate that forms makes triode V₁Base stage obtain high level, thereby make V₁And K₁Relay K in the shutdown circuit that forms₁Adhesive, K₁Normally-closed contact K_1－1Disconnect controllable silicon VS cut-off, complete machine outage, end-of-job.

In circuit, IC and C₂And C₃Form voltage-stabilizing system, for circuit provides burning voltage; Capacitor C₄Be used for preventing the interference of outer bound pair circuit; Diode VD₆And VD₇Respectively and K₁、K ₂Parallel connection is for the protection of V₁And V₃, making it can be by K₁And K₂The induced electromotive force that produces punctures.

Embodiment:

Sensing switch S ₁-S ₄Be micro-switch, resistance R ₁-R ₄Be 22K Ω, R ₅-R ₈Be 4.7K Ω, R ₉Be 19K Ω, diode VD ₁-VD ₇Be IN4001, aerotron V ₁, V ₃Be 3DG12, V ₂Be 3DG6, K ₁, K ₂Be JRC type relay, R ₁₀Be 22K Ω, R ₁₁Be 360 Ω, capacitor C ₂Be 0.47 μ, C ₃Be 470 μ, C ₁Be 33 μ, C ₄Be 0.047 μ, IC is W7812, and diac VS is 1A600V, and LED is 30mA, and HA is the 12V buzzer phone.

Claims

1, a kind of car hosit is anti-turns over warning device, comprises the boot-strap circuit, shutdown circuit, time delay circuit and the power element that are connected with the logic identification circuit, it is characterized in that sensor is installed on the car hosit supporting leg, and is connected with the logic identification circuit.

2, car hosit according to claim 1 is anti-turns over warning device, it is characterized in that the logic identification circuit be by or gate logic and AND gate be formed in parallel.

3, car hosit according to claim 1 is anti-turns over warning device, it is characterized in that time delay circuit is by aerotron V ₃And and V ₃Base stage bonded assembly capacitor C ₁Form.

4, car hosit according to claim 1 is anti-turns over warning device, it is characterized in that described power element is a buzzer phone.

5, car hosit according to claim 1 is anti-turns over warning device, it is characterized in that sensor 3 is installed on the fixed supporting leg 2.