CN201250070Y

CN201250070Y - Overload warning device of lorry-mounted crane

Info

Publication number: CN201250070Y
Application number: CNU2008200773546U
Authority: CN
Inventors: 郭金龙; 汤志远; 张志平; 杜宏斌; 石联军; 许燕强; 李志青; 孙晓峰
Original assignee: Changzhi Qinghua Machinery Factory
Current assignee: Changzhi Qinghua Machinery Factory
Priority date: 2008-05-21
Filing date: 2008-05-21
Publication date: 2009-06-03
Anticipated expiration: 2018-05-21

Abstract

The utility model relates to an overload warning device of lorry-mounted crane, in particular to a device for the detection of a straight-arm type crane and the overload warning of movable arms thereof, which mainly solves the problem by providing a device which uses the movable arm oil cylinder of the straight-arm crane as power and can send out signals, when the torque generated by the heavy objects hoisted by the lorry-mounted crane is larger than the required range of the design requirement, namely, the pressure of the movable arm oil cylinder is higher than the preset value. The scheme adopted is that the mechanical structure of the overload warning device comprises: the pressure collecting end of a pressure relay is connected in series on the oil inlet pipeline of the movable arm oil cylinder. The circuit structure of the warning device comprises: the input end of the pressure relay is connected with a positive electrode of a power supply, the output end of the pressure relay is connected in series in an acoustic alarm, and the output end of the acoustic alarm is connected with the negative electrode of the power supply. The overload warning device can be widely applied in various cranes, and is especially suitable for lorry-mounted cranes.

Description

The overload alarm of lorry-mounted crane

Technical field

The overload alarm of the utility model lorry-mounted crane is specifically related to its swing arm overload of detection of a kind of straight arm type lorry-mounted crane and the device of reporting to the police.

Background technology

The straight arm type lorry-mounted crane is the well accepted product in market, because the behavior of structure of product, do not installing under the overload protection situation, very easily produce the moment overload, the moment overload problems is perplexing each manufacturer all the time, and the method that the producer that has strengthens safety factor by when design solves overload, causes the product dead weight to increase, in fact form big ton small tenon, reduced the loading mass of truck with loading crane simultaneously; The producer that has the then method of the limiter of moment by increasing car hosit solves overload, and is feasible on this method and technology, but because this cover system expense costliness, and increased many additional structures, increase the cost of lorry-mounted crane greatly.

The utility model content

Problem to be solved in the utility model is to overcome the deficiencies in the prior art, a kind of overload alarm of lorry-mounted crane is provided, specifically be that boom cylinder with the straight arm type lorry-mounted crane is a power, the moment that the weight that lifts by crane when lorry-mounted crane produces is greater than the scope of designing requirement regulation, be the pressure of boom cylinder when being higher than setting value, send the device of alerting signal.

For solving the problems of the technologies described above, the scheme that the utility model adopts is: the overload alarm of lorry-mounted crane, be made up of the physical construction of overload alarm and the circuit structure of warning device, the physical construction of described overload alarm is: the pressure acquisition end polyphone of pressure relay is connected on the oil inlet pipeline of boom cylinder.

The circuit structure of described warning device is: the input end of pressure relay links to each other with positive source, and the mouth polyphone of pressure relay inserts combined aural and visual alarm, and the mouth of combined aural and visual alarm links to each other with power cathode.

In the circuit structure of above-mentioned warning device with the two ends of indicator lamp and be connected in the input end of pressure relay and the mouth of combined aural and visual alarm.

Above-mentioned combined aural and visual alarm also can be replaced by the buzzer phone and the flasher relay of parallel connection.

The overload alarm of the utility model lorry-mounted crane compared with prior art has following beneficial effect:

The utility model only need get final product with corresponding warning circuit by the pressure boost relay in original lorry-mounted crane; and organically utilization machinery, hydraulic pressure and electric combination; reach the purpose of overload alarm; on lorry-mounted crane, use; play the better protect effect, only increased productive costs seldom.

1. it is low to increase cost, the system architecture compactness;

2. when lorry-mounted crane when overload lifting, can report to the police timely automatically, judge whether the defective of transshipping by experience before changing;

3. need not change the original structure of lorry-mounted crane, only need on original basis, this cover system to be installed and get final product;

4. report to the police timely automatically, more embody the design of hommization.

Description of drawings

Below in conjunction with accompanying drawing the utility model is described in further detail:

Fig. 1 is the physical construction scheme drawing of the overload alarm of the utility model lorry-mounted crane;

Fig. 2 is first kind of electrical block diagram of the overload alarm of the utility model lorry-mounted crane;

Fig. 3 is second kind of electrical block diagram of the overload alarm of the utility model lorry-mounted crane.

The specific embodiment

Fig. 1, Fig. 2 and Fig. 3 are the application of the utility model at the straight arm type lorry-mounted crane, among Fig. 1, the pressure acquisition end of polyphone cut-in pressure relay 2 on the oil inlet pipeline of boom cylinder 1, because boom cylinder 1 adopts board-like the connection with balance cock 7, only need the mouth of the pressure acquisition end of pressure relay 1 polyphone access balance cock 7 and the input end of boom cylinder 1 to be got final product by crossover sub, other physical constructions need not to change, hydraulic oil flows according to the diagram direction of arrow, and the model of pressure relay 2 can be JCS-02H; Among Fig. 2, the input end of pressure relay 2 links to each other with positive source, the mouth polyphone of pressure relay 2 inserts combined aural and visual alarm 3, the mouth of combined aural and visual alarm 3 links to each other with power cathode, and with the input end of indicator lamp 4 cut-in pressure relays 2 in parallel and the mouth of combined aural and visual alarm 3, between the positive pole of power supply and this circuit structure successively series connection insure the silk and switch, this power supply is supplied with by car chassis, can be the 24V direct supply; Among Fig. 3, buzzer phone 5 and the flasher relay 6 of the described combined aural and visual alarm 3 of Fig. 2 by parallel connection replaced, this power supply is supplied with by car chassis, adopts the 220V source of AC, and other structures are identical.

The utility model is according to the specified hoisting moment of lorry-mounted crane, determine the maximum working pressure (MWP) of boom cylinder 1, set thus and regulate the maximum working pressure (MWP) on the pressure sensor in the pressure relay 2, when the pressure of boom cylinder 1 input end meets or exceeds in the pressure relay 2 maximum working pressure (MWP) on the pressure sensor, pressure relay 2 mouths are connected, thereby combined aural and visual alarm 3 or buzzer phone 5 and flasher relay 6 are communicated with, reach the function of warning, remind this hoisting crane of operator to overload; Insert indicator lamp 4 in the circuit, can judge the whether connection of this warning according to the switching of indicator lamp 4.

Claims

1. the overload alarm of lorry-mounted crane is made up of the physical construction of overload alarm and the circuit structure of warning device, it is characterized in that:

The physical construction of described overload alarm is: the pressure acquisition end polyphone of pressure relay (2) is connected on the oil inlet pipeline of boom cylinder (1);

The circuit structure of described warning device is: the input end of pressure relay (2) links to each other with positive source, and the mouth polyphone of pressure relay (2) inserts combined aural and visual alarm (3), and the mouth of combined aural and visual alarm (3) links to each other with power cathode.

2. the overload alarm of lorry-mounted crane according to claim 1 is characterized in that: in the circuit structure of warning device with the two ends of indicator lamp (4) and be connected in the input end of pressure relay (2) and the mouth of combined aural and visual alarm (3).

3. the overload alarm of lorry-mounted crane according to claim 1 and 2 is characterized in that: above-mentioned combined aural and visual alarm (3) also can be replaced by the buzzer phone (5) and the flasher relay (6) of parallel connection.