CN2620863Y

CN2620863Y - Oil pressure detecting system for starting jack

Info

Publication number: CN2620863Y
Application number: CN 03244335
Authority: CN
Inventors: 谢建军; 卢剑峰; 韦冬梅
Original assignee: Ouweimu Machinery Co ltd Liuzhou City
Current assignee: Liuzhou OVM Machinery Co Ltd
Priority date: 2003-05-01
Filing date: 2003-05-01
Publication date: 2004-06-16
Anticipated expiration: 2013-05-01

Abstract

A lifting jack startup oil-pressure testing system, consisting of an oil pump, a connecting oil circuit, a displacement sensor, a displacement display instrument, a data communication module, a pressure transmitter, a pressure surveymeter, a direct current supply for the communication module, an industrial control computer loaded with software of a lifting jack startup oil-pressure testing, a monitor, and a printer. A stop valve, an inverted valve, a throttle and an overflow valve are arranged in turn in the connecting oil circuit. One end of the connecting oil circuit is connected with the lifting jack to be tested. The displacement sensor arranged on the lifting jack is provided with a pull-rod that can stretch with the piston of the lifting jack simultaneously. The pressure transmitter is arranged on the feeding loop of the lifting jack. The displacement display instrument and the pressure surveymeter are arranged with RS 485 interfaces and respectively connected with the RS 232 interfaces of the industrial control computer through the data communication module. The signal wire of the data-collecting module is connected with the serial port of the computer, and the printer is connected with the lpt of the computer. The testing system is in a high automatization and testing efficiency and accurate and reliable in data.

Description

Lifting jack starts the oil pressure detection system

Technical field

The utility model relates to a kind of pick-up unit, and particularly a kind of lifting jack starts the oil pressure detection system.

Background technology

All need start the detection of oil pressure before lifting jack dispatches from the factory, present detection means is the motion conditions of artificial visual inspection jack piston, as long as the manometric reading of read pointer formula is removed in piston one action then, has the following disadvantages:

1, the motion conditions that needs the special messenger to observe jack piston, it is many to drop into manpower;

2, detection means falls behind, and testing tool is simple and crude, measures with pointer pressure, manually sees table, the naked eyes reading, and accuracy of detection is low;

3, detection depends on manually and carries out, and manually sees table, artificial reading, and the manual record test figure, whether artificial judgment starts oil pressure overproof, manually fills in test report, and testing staff's labour intensity is big, and it is low to detect automatization level and detection efficiency;

4, this detection means has a fatal shortcoming: owing to start oil pressure is the oil pressure of moment, jack piston one starts, oil pressure rises rapidly, the variation that is reflected on the pointer pressure is exactly that the gauge hand swing is very fast, thereby human eye is difficult to capture lifting jack and starts at that moment oil pressure, causes the startup oil pressure of lifting jack to measure inaccurate.

Technology contents

The technical problems to be solved in the utility model is: existing manual type detection means is backward, testing tool is simple and crude, accuracy of detection is low even measured value inaccurate; Testing staff's labour intensity is big, the problem that detection efficiency is low, a kind of automatization level and testing efficiency that modern microelectric technique, infotech and The present computer technology improve test of using is provided, guarantee that lifting jack starts the accuracy and the reliability of oil test data, improve measuring accuracy, the lifting jack that alleviates reviewer's labour intensity starts the oil pressure detection system.

The technical scheme that solves its above-mentioned technical matters is: a kind of lifting jack starts the oil pressure detection system, by oil pump and connection oil circuit, displacement transducer, the displacement Displaying Meter, the data communication module, pressure unit, pressure detecting instrument, the communication module direct supply, the band lifting jack starts the industrial control computer that oil pressure detects software, display, printer is formed, charged magnet of described displacement transducer and gauge tap, and be installed on the tested lifting jack by electromagnet, it has a pull bar that can move freely, this pull bar and jack piston are flexible simultaneously, the displacement data that displacement transducer can be transmitted carries out analog-to-digital displacement Displaying Meter and has the RS485 interface, and be connected with the RS232 interface of industrial control computer by the data communication module, pressure unit is installed on the oil-feed loop of lifting jack, the pressure data that pressure unit can be transmitted carries out analog-to-digital pressure detecting instrument and has the RS485 interface, and be connected with industrial control computer RS232 interface by the data communication module, the signal wire of data communication module connects with the serial port of computing machine, and printer connects with the parallel port of computing machine.

Test philosophy: displacement transducer is installed on the lifting jack, it has a pull bar that can move freely, this pull bar and jack piston are flexible simultaneously, thereby displacement transducer can detect the travel position signal of lifting jack, pressure unit is installed on the oil-feed loop of lifting jack, the oil pressure that can detect lifting jack in real time changes, displacement transducer and pressure unit convert detected travel position signal and fuel injection pressure signal to the current signal of 4～20mA respectively, respectively the current signal of 4～20mA is delivered to displacement Displaying Meter and pressure detecting instrument again then, in instrument, carry out becoming binary signal after the A/D conversion, deliver to industrial control computer at last, under the effect of testing software, can detect jack piston startup oil pressure at that moment just, realize that lifting jack starts the collection that oil pressure detects test figure, preserve, analyze, generation and the printing handling and test form.

Owing to adopt said structure, the lifting jack of the utility model starts the oil pressure detection system and has following good effect:

1, need not the motion conditions that the special messenger observes jack piston, detect and carry out automatically, saved manpower.

2, adopt high accuracy displacement sensor and pressure sensing transmitter to detect, need not manually to see table, need not the naked eyes reading, need not the manual record test figure, the measuring accuracy height.

3, charged magnet and gauge tap and the magnetic force by electromagnet are installed on the tested lifting jack on the displacement transducer, by its electromagnet of switch controls whether ferromagnetism are arranged, thus the installation of displacement transducer with remove extremely convenient.

4, because the cooperatively interacting of displacement transducer and pressure unit, thereby can accurately capture lifting jack and start at that moment oil pressure, accurately measure the startup oil pressure of lifting jack.

5, applicable industry control computer and special test figure collection analysis process software are gathered, analyze, are handled test figure, computer acquisition is after test figure, automatically rated oil pressure and the building industry industry standard JG/T 5028-93 according to lifting jack judges whether the startup oil pressure of lifting jack is overproof, and generate and printing test form, improve testing efficiency and test automation level greatly, alleviated reviewer's labour intensity.

6, utilize computer testing system, the test figure of every lifting jack can be kept in the computing machine, convenient inquiry and retrieval.

Description of drawings:

Fig. 1: the lifting jack of the utility model starts oil pressure detection system hydraulic schematic diagram;

Fig. 2: the lifting jack of the utility model starts oil pressure detection system electricity principle schematic.

Embodiment:

Below, the technical characterictic to the utility model lifting jack startup oil pressure detection system is further described in conjunction with the accompanying drawings and embodiments.

Embodiment:

A kind of lifting jack starts the oil pressure detection system, by oil pump 9 and connection oil circuit, displacement transducer 1, displacement Displaying Meter 12, data communication module 17, pressure unit 4, pressure detecting instrument 16, communication module direct supply 13, the band lifting jack starts the industrial control computer 18 that oil pressure detects software, display 14, printer 15 is formed, connect in the oil circuit and be connected with stop valve 5 successively, retaining valve 6, throttling valve 7, surplus valve 8, oil pump 9, connecting oil circuit one end links to each other with tested lifting jack oil circuit, one end communicates with oil pump 9, described displacement transducer 1 charged magnet and gauge tap, and be installed on the tested lifting jack 2 by electromagnet, it has a pull bar that can move freely, this pull bar and jack piston are flexible simultaneously, the displacement data that displacement transducer 1 can be transmitted carries out analog-to-digital displacement Displaying Meter 12 and has the RS485 interface, and be connected with the RS232 interface of industrial control computer 18 by data communication module 17, pressure unit 4 is installed on the oil-feed loop of tested lifting jack, the pressure data that pressure unit 4 can be transmitted carries out analog-to-digital pressure detecting instrument 16 and has the RS485 interface, and be connected with the RS232 interface of industrial control computer 18 by data communication module 17, the signal wire of data communication module 17 connects with the serial port of computing machine, and printer 15 connects with the parallel port of computing machine.

Oil pump 9 is power sources of lifting jack action, regulates the throttling valve 7 on the oil pump oil circuit, and oil pressure is slowly risen, and just can measure the startup oil pressure of lifting jack.

Displacement transducer 1 charged magnet and gauge tap and the magnetic force by electromagnet are installed on the tested lifting jack 2, and it has a pull bar that can move freely, and this pull bar and jack piston are flexible simultaneously, thereby detect the action situation of jack piston; Stir on the displacement transducer switch controls its whether band ferromagnetism is arranged, thereby the installation of displacement transducer with remove extremely convenient.

Displacement Displaying Meter 12 models are XJM/A-H2B2S2, also adopt advanced special-purpose singlechip chip IC9504, and the function of amplifier section digital displaying meter is compiled in this chip software, make every performance level of instrument have one significantly to improve and break through.Instrument hardware reduces in a large number, and assembly volume dwindles, and technology is significantly improved, and function has higher stability and reliability by the panel and keypad setting.

The displacement data that displacement Displaying Meter 12 is used for displacement transducer is transmitted carries out analog to digital conversion, show then, and can provide displacement transducer 24V direct supply, have the RS485 interface simultaneously, can be connected with the RS232 interface of industrial control computer 18 by the data communication module, thereby can send displacement data industrial control computer further to handle.

Pressure unit 4 is selected the import high precision for use, the high stability sensitive element, adopt aluminum alloy casing and stress isolation technology to encapsulate, sensitive chip is combined by the silicon diaphragm of doing the diffuse si resistance bridge and the ceramic substrate with resistance trimming performance, have good long term stability and temperature stability, signal compensates through precision temperature, processing and amplifying converts 4～20mA standard signal to, thereby can with DDZ-III, DDZS series instrument and industrial computer or distributing system interface, it is installed in the oil-feed loop of lifting jack, the oil pressure that can detect lifting jack in real time changes, and realizes measuring automatically.

Pressure detecting instrument 16 adopts dsp chip---a kind of microprocessor with special construction, the Harvard structure that the inside of dsp chip adopts program and data to separate, has special hardware multiplier, this pressure detecting instrument carries out analog to digital conversion to the pressure data that pressure unit 4 transmits, show then, and can provide pressure unit 24V direct supply, have the RS485 interface simultaneously, and be connected with the RS232 interface of industrial control computer 18 by data communication module 17, thereby can send pressure data industrial control computer 18 further to handle.

Data communication module 17 is the RS-485/RS-232 interface convertor; be used for half-duplex RS-485 is converted to the differential signal of RS-232, the RS-232 of compatible EIA and RS-485 standard, built-in flow control chip; anti-thunderbolt and ESD antistatic protection have the zero propagation auto-conversion function.Support multi computer communication, can connect 128 nodes at most, adopt a DB9 hole shape connector to link to each other with RS-232 interface; The other end adopts DB9 aciculiform connector or connection terminal to link to each other with the RS-485 interface, realizes the RS485/232 conversion, and displacement Displaying Meter 12, pressure detecting instrument 16 can be connected with the RS232 serial port of industrial control computer 18.

Communication module provides data communication module 24V direct supply with direct supply 13.

The test analysis process software is that the lifting jack of developing on the MCGS configuration platform that is specifically designed to starts the software that oil pressure detects.

The industrial control computer 18 that the band lifting jack starts oil pressure detection test analysis process software can carry out the setting of test parameters, the setting of systematic parameter, test figure preservation, analysis, statistics and report generation and printing function.Among Fig. 1,10 is filter screen, and 11 is fuel tank.

Claims

1, a kind of lifting jack starts the oil pressure detection system, it is characterized in that: this detection system is by oil pump (9) and connect oil circuit, displacement transducer (1), displacement Displaying Meter (12), data communication module (17), pressure unit (4), pressure detecting instrument (16), communication module direct supply (13), the band lifting jack starts the industrial control computer (18) that oil pressure detects software, display (14), printer (15) is formed, connect in the oil circuit and be connected with stop valve (5) successively, retaining valve (6), throttling valve (7), surplus valve (8), connecting oil circuit one end links to each other with tested lifting jack oil circuit, one end communicates with oil pump (9), charged magnet of described displacement transducer (1) and gauge tap, and be installed on the tested lifting jack (2) by electromagnet, it has a pull bar that can move freely, this pull bar and jack piston are flexible simultaneously, the displacement data that displacement transducer (4) can be transmitted carries out analog-to-digital displacement Displaying Meter (12) and has the RS485 interface, and be connected with the RS232 interface of industrial control computer (18) by data communication module (17), pressure unit (4) is installed on the oil-feed loop of tested lifting jack, the pressure data that pressure unit (4) can be transmitted carries out analog-to-digital pressure detecting instrument (16) and has the RS485 interface, and be connected with the RS232 interface of industrial control computer (18) by data communication module (17), the signal wire of data communication module (17) connects with the serial port of computing machine, display (14), printer (15) connects with the parallel port of industrial control computer (18).