SU708140A1 - Device for measuring the length of moving objects - Google Patents

Description

I

The invention relates to a measurement technique and can be used to measure the length of moving articles, such as rolled products.

A device for measuring the length of distant objects is known, comprising a measuring roller with a pulsator and a pulse counter 1. However, this device has large dimensions, determined by the fact that the measuring site must be at least two maximum lengths of the measured object.

The closest in technical essence to the proposed is a device for measuring the length of moving objects, for example, rolled products, containing a measuring roller with a puller, a sensor for the leading edge of an object, sensors for the trailing edge of an object, a pulse counter, an information processing circuit and a recorder 2.

However, this device also has large dimensions.

The purpose of the invention is to reduce the size of the device.

This is achieved by the fact that, in the proposed device, the information processing circuit is made in the form of initial length setpoints, controlled pulse keys, the information inputs of which are connected to the outputs of the corresponding initial length setting devices, and the control inputs to the outputs of the corresponding rear edge sensors of the object, two logic elements a ban, the control inputs of which are connected to the sensor output of the leading edge of the object, the information inputs of the first element of the ban are connected to the corresponding outputs of the controlled the impulse keys, and its output to the input of the pulse counter numbers, the information input of the second element is locked to the output of the pulsator, and the output to the subtracting input of the pulse counter and the control key, the control input of which is connected to the output of the sensor of the leading edge of the object, information input - to the output of the pulse counter, and output - to the input of the recorder.

Claims (2)

The drawing shows the $ 1 rational layout of the device. The device contains a drive roller conveyor 1, the sensor 2 leading edge of the object, sensors 3 6 of the rear edge of the object, measuring roller 7, puller 8, controlled impulse keys 9-12, setpoint 13-16 initial lengths, logic elements 17, 18, prohibition, counter 19 pulses, controlled key 20 and recorder 21. The dimensions indicated on the drawing are related to the following relations: ab lminL lmax, where Imin and Imax, respectively, are the smallest of the possible lengths of the object. The device works as follows. The object is fed to a drive roller 1, which moves it in the direction indicated by the arrow in the drawing. The object moves along a set of trailing edge sensors 3-6. When the rear edge of the object passes the sensor 3, the latter signals the signal to the control input of the controlled pulse key 9, which opens briefly and through the open element 17, the inhibitor connects the setting device 13 to the input of the input of the numbers of the pulse counter 19. In the counter enters with a number equal to LI. If at this point the object is already in contact with the measuring roller 7, the latter rotates and the associated puller 8 produces pulses, the number of which corresponds to the angle of rotation of the measuring roller 7, and consequently, the amount of movement of the object. From the pulser 8 through the open element 18, the prohibition of the pulses goes to the counter 19 and subtracts from the setting device 13 the number L. When the front edge of the object reaches the sensor 2, the latter generates a signal that goes to the control input of the element 18 prohibition and stops the flow of pulses into the counter 19 from the pulser 8. In the counter there remains a number equal to the measured length of the object. Through the signal 2 from the sensor 2 opened by the sensor 2, the controlled key 20 goes to the recorder 21. If at the moment when the rear edge of the object passes If the object is not in contact with the measuring roller 7, then before the front edge of the object reaches the sensor 2, the rear edge of the object passes the sensor 4 (since a b) and the contents of counter 19 become equal to the number La If at this moment the object enters contact with the measuring roller 7, the pulses coming from the pulser 8 are subtracted in the counter 19 from the number Lj. Otherwise, the rear speaker will pass the sensor 5, and then the sensor 6, with the contents of the counter 19 becoming equal to LS, then C, and so on. In any case, the length of the object is determined as follows: I LJ - PD1 where LJ is the distance between the leading edge sensor and the trailing edge sensor that received the signal last before sending the signal, the leading edge sensor; n is the number of pulses entered into the counter from the pulser from the moment the signal was issued by the last trailing edge sensor and up to the moment the signal was received by the leading edge sensor; L1 is the impulse impulse price in units of object length. Before the end of the measurement, the contents of the counter 19 are not transferred to the recorder 21, since the control key 20 is open. The measurement ends when the front edge of the sensor 2 object is reached. This opens the key 20 and the measurement result goes to the recorder 21. The proposed device has small dimensions, since the length of the section on which the rum is being measured may be tically equal to the maximum possible length of the object. Apparatus for measuring the length of moving objects, such as rolled products, containing a measuring roller with a puller, an object front edge sensor, an object rear edge sensors, a pulse counter, an information processing circuit and a recorder, characterized in The information processing circuit is designed as initial length setters, controlled by impulse keys, the information inputs of which are connected to the outputs of the corresponding initial length setters, and the control inputs are the outputs of the corresponding sensors of the rear edge of the object, two logical prohibition elements, the control inputs of which are connected to the sensor output of the front edge of the object, the information inputs of the first element of the prohibition are connected the input of the second element is prohibited from being connected to the output of the pulsator, and the output to the subtracting input of the pulse counter, and a control key whose control input is connected to the output of the sensor ik the front edge of the object, the information input to the output of the pulse counter, and the output to the input of the recorder. Sources of information taken into account in the examination 1. US patent number 3899831, cl. 33-141B, 1975. 2. Japanese Patent No. 48-6983, cl. 106 00 1973 (prototype). / i-t 4 O; L and; A O; A U; CJ