With the continuous expansion of warehouse transportation, the number of cargo weighing points has also increased. In order to solve the contradiction between the increase of equipment and the relatively small number of personnel, we have drawn on the successful experience of the unattended electric forklift weighing system. After more than three months of efforts, we successfully developed a remote weighing system, and built the first unattended weighing system in China with two electronic scales located in the yard of the Equipment Department as a pilot. Measuring personnel can identify the vehicle number, adjust the position, collect and store data, and print statistics of the electric forklift over the electronic scale at the site from a distance of 1,000 meters. It achieves the design requirements of remote control, no need for guarding and presence, and lays a solid foundation for the realization of highly intelligent on-line measurement. in November 2003, the project successfully passed the technical appraisal organized by Jiangsu Provincial Science and Technology Department, and it is believed that the remote measurement and monitoring technology has reached the advanced level in China. 

First, the proposed project and program to determine 

The development of unattended remote weighing system is mainly to solve the contradiction between the increase of weighing system points and personnel tension, and to make technical preparation for the next step to realize the centralized monitoring of cargo measurement and online measurement. We chose a static electric forklift and an electric forklift located in the Transportation Cargo Plant of the Equipment Department as the pilot, and the two electronic scales are located at the north and south ends of the cargo yard, about 2 kilometers apart. Through repeated visits to the site to understand the two electronic scales of the measurement method, data flow, logistics varieties and other information, determined to be located in the south end of the yard office area of the 3-ton electronic scale room as the main control room, the installation of monitoring and control in the electronic scale room, transmission equipment, the electric forklift site will be sent to the main control room of the audio, video, data signals, measurement of the personnel in the electronic scale room through the receipt of a variety of information on the site of the control of electric forklifts and metering. 

Second, the working principle and technical characteristics 

Utilizing closed-circuit television monitoring, audio and video transmission technology, combined with computer network technology, it establishes a remote weighing and control of electric forklift trucks that integrates image, sound, data and on-site equipment control. Successfully applying TV monitoring, fiber optic communication, sound and light alarm and other advanced technologies to the weighing system, it has completely solved the problem of measurement in remote and dangerous environments, realized unattended measurement on site and localized measurement with remote data transmission, and remotely controlled the whole measurement process (including zero point monitoring and adjustment) without the need for personnel to operate on site. It accommodates weighing, security, monitoring, broadcasting, data acquisition, on-site equipment control, signal transmission, and application of video and audio optical transceivers. It has obvious practicality, safety, reliability and advancement. And it greatly improves the working efficiency and reduces the transportation cost. This electric forklift weighing system is technologically advanced, easy to operate, fast running speed, friendly running interface, and has good versatility.

Overview of weighing system 

The unattended remote measurement and control weighing system mainly consists of four modules: on-site control, safety protection, weighing system control and weighing system software. 

1, the site control part by two TC-623 "night cat" low-light auto iris camera, and configure SSL-033M type ten times the electric three variable lens, two photoelectric sensors, a MP-300P amplifier host and two DSP-108 outdoor type broadcasting speakers and the site measurement instrument, computer components. . Responsible for measuring the electric forklift vehicle number identification, vehicle position control, data, audio, video acquisition. 

2, the security module is an important part of the electric forklift, by a TC-623 "night cat" low-light auto iris camera, a TD-223 dome camera and infrared detection alarms, sound and light alarms, the four with the use of. Located at the door of the far infrared probe in the restricted area to detect the infrared signals emitted by the human body, start the indoor camera, image recording, storage and transmission, as well as sound and light alarms. 

3, electric forklift control module mainly consists of two with four-way video, one audio, two data VADT / R7230-type optical transceiver, a GECDR-04P "Storage King" hard disk recorders, computers, broadcast microphone, communication fiber optic cable. It is responsible for sending, receiving and processing data, audio and video. It adopts ST optical interface, single-mode transmission mode, PAL system for image transmission, and bi-directional RS232 interface for data transmission. Control the on-site camera and optical transmitter to complete the PTZ lens control, wiper control, fan control, alarm monitoring, full screen or frame extraction video recording. 

4, electric forklift software is the core of the entire weighing system. Software design based on WINDOWS98 object-oriented visual programming language VISUAL BASIC 6.0 development, friendly interface, easy to operate, strong human-computer interaction. The program is mainly on the transmission of data with a special design, so that the program can be operated remotely. It is mainly divided into two parts, one part is the software preparation of the sending end, which is mainly responsible for the information collection and sending of the measurement data, and the measurement data will be received from the weighing instrument to the computer and then sent to the fiber optic terminal, and then transmitted to the main control room through the fiber optic cable. The other part is the preparation of software for receiving end. It mainly accomplishes data reception, maintenance, monitoring, uploading, statistics, printing, querying and zero point tracking adjustment of on-site measuring equipment.

Fourth, the measurement process is briefly described 

When the train into the electronic scale platform, installed in the scene of the original duty room at the front end of the two cameras and photoelectric sensors installed at both ends of the electronic scale body began to work, while measuring data collection of electric forklifts automatically start, real-time measurement data and the scene of the audio and video signals from the site of the weighing instruments, computers, industrial control machines and optical transceivers to collect, store and transmit, through the fiber-optic cable remote transmission to the main control room, the main control room of the optical receiver, the main control room, the main control room, the main control room, the main control room of the optical receiver. The optical receiver and video industrial control machine (DVR) in the main control room receives, supervises, records and stores the data and image signals in real time, and automatically carries out the classification and identification of the signals and the statistical printing of the data. When the electric forklift is in a non-normal position, the Division of electronic scales personnel can be recognized in the main control room through the image and photoelectric sensors, with a microphone and speakers located in the field to remind the locomotive personnel to adjust the car position in a timely manner. 

V. Application Effect 

Since the electric forklift weighing system was put into operation on June 20, 2003, the electric forklift weighing system has been running stably, with accurate measurement data, clear and stable audio and video images without jitter, and no false alarms or omissions in the anti-theft alarm test. The staff of the Division of electronic scales has been reduced from 8 to 4, which has improved the working efficiency and achieved better economic and social benefits.