CN201016959Y

CN201016959Y - Pipe seam checkout gear

Info

Publication number: CN201016959Y
Application number: CNU2007200687512U
Authority: CN
Inventors: 樊天伟; 阮道献
Original assignee: SHANGHAI PANZHIHUA MACHINERY FACTORY
Current assignee: SHANGHAI PANZHIHUA MACHINERY FACTORY
Priority date: 2007-04-09
Filing date: 2007-04-09
Publication date: 2008-02-06
Anticipated expiration: 2017-04-09

Abstract

The utility model discloses a pipe seam detection device used for solving pipe base end vertical seta, crack even mutual insertion phenomena of a double-rotating cold rolling mill during rolling process, which cause thick wall pack rolling, cause the rolling mill to be overloading and even cause accidents in severe cases such as mill parts damages, etc. The pipe seam detection device consists of a coil, an oscillator, an amplification rectifier circuit, a reference circuit, a comparison circuit and a monitoring device. Pipe bases and pipe seams passing through a coil are monitored through electromagnetic field principle to control the speed of a main motor of the rolling mill to avoid pipe base end vertical seta, crack and pack rocking accidents.

Description

Pipe seam detecting device

One, technical field

The utility model relates to a kind of pick-up unit, particularly relates to a kind of pipe seam detecting device.

Two, background technology

Existing cold pilger mill; particularly a kind of action of sending to of high speed two its pipes of roller cold-rolling pilger mill heads on last pipe by a back pipe and moves forward gradually; when after the front end of a pipe and tail end (the pipe seam of last pipe; be commonly called as pipe seam) when all being in the rolling deformation district; because both wall thickness all roll thinner and thinner; usually can produce both end ruff, cracking; even the phenomenon of inserting mutually; at this moment very easily cause wall thickness ply rolling accident; cause the milling train overload, can cause the milling train parts to damage when serious.For fear of the generation of ply rolling accident, guarantee the milling train safe operation, just need be when pipe seam be in the rolling deformation district, the rolling mill speed that slows down reduces the frequency of both end pushing tows, just can avoid end ruff, cracking, elimination ply rolling accident.Realize above-mentioned purpose, must have instrument or equipment to go to detect the residing position of pipe seam could realize, yet present cold pilger mill, particularly high-speed cold Pilger mill all do not have this checkout equipment.

Three, utility model content

In order to address the above problem, the utility model provides a kind of pipe seam detecting device, this device can adopt following technical scheme to implement: it is made up of detecting coil, measurement coil, oscillator, amplification rectification circuit, reference circuit, comparator circuit and supervising device, detecting coil two termination oscillators wherein, measure the coil two ends and connect the amplification rectification circuit, amplify rectification circuit and connect with comparator circuit, supervising device, the output of reference circuit connects the input end of comparator circuit.

The pipe seam detecting device of forming according to technique scheme compared with prior art its advantage is: the position that just can accurately detect it before pipe seam enters the rolling deformation district, the speed of milling train master motor slows down, just can guarantee the milling train safe operation, avoid accidents such as end ruff, cracking, elimination ply rolling to take place.

Four, description of drawings

Fig. 1, pipe seam detecting device principle schematic.

Five, embodiment

Pipe seam detecting device of the present utility model is further elaborated by the following examples again.

As shown in Figure 1, pipe seam detecting device is made up of detecting coil 1, measurement coil 2, oscillator 3, amplification rectification circuit 4, reference circuit 6, comparator circuit 5 and supervising device 7, two termination oscillators 3 of detecting coil 1 wherein, measure two terminations of coil 2 and amplify rectification circuit 4, amplify rectification circuit 4 and connect with comparator circuit 5, supervising device 6, the output of reference circuit 6 connects the input end of comparator circuit 5.When pressing the pipe seam detecting device work of schematic structure composition, pipe passes detecting coil, adds HF voltage in detecting coil, forms a high frequency magnetic field around coil, and this magnetic field can form eddy current on metal pipe surface, the energy in consumption magnetic field.When pipe seam is regional by this, because the existence of pipe seam, the eddy current on metal pipe surface can reduce, the magnetic field energy that is consumed is corresponding also to be reduced, can detect the variation of high frequency magnetic field by measurement coil 2, this variable signal inserts and amplifies reference signal that rectification circuit sends with reference circuit after treatment again relatively, and result relatively send supervising device.When result relatively surpasses certain limit, just can be defined as " pipe seam passes through ", recover the speed of milling train master motor again.

Claims

One kind by detecting coil (1), measure coil (2), oscillator (3), amplify the pipe seam detecting device that rectification circuit (4), reference circuit (6), comparator circuit (5) and supervising device (7) are formed, the two termination oscillators (3) that it is characterized in that detecting coil (1), measure two terminations of coil (2) and amplify rectification circuit (4), amplify rectification circuit (4) and connect with comparator circuit (5), supervising device (6), the output of reference circuit (6) connects the input end of comparator circuit (5).