CN1126116A

CN1126116A - Detecting device for roller clearance of 4-roller rolling mills

Info

Publication number: CN1126116A
Application number: CN 95113614
Authority: CN
Inventors: 杨仁霖
Original assignee: Xi'an Heavy-Duty Machinery Inst Ministry Of Machine Building
Current assignee: Xi'an Heavy-Duty Machinery Inst Ministry Of Machine Building
Priority date: 1995-11-30
Filing date: 1995-11-30
Publication date: 1996-07-10
Anticipated expiration: 2015-11-30
Also published as: CN1044577C

Abstract

The roller gap detector for 4-roller rolling mill is composed of top and bottom test stands sleeve-installed to necks of working rollers, dual-piston test cylinder between two stands, and differential pressure-change type displacement sensor in piston. On working, two pistons are extended to contact with top and bottom stands. When displacement of central line of working roller occurs, a displacement signal is transferred to sensor, so indirectly detecting the displacement with high dynamic response and reliability.

Description

The roll gap checkout gear of four-high mill

The present invention relates to a kind of displacement detector, specifically a kind of roll gap checkout gear of four-high mill.

In strip-rolling, particularly need the breaker roll roll gap to detect in real time in the operation of rolling of high accuracy band, so that guarantee the thickness and precision of rolled strip.Existing milling train adopts the method for measuring the roll relative position to come the indirect detection roller gap mostly.Just adopted above-mentioned detection method as the German Fo Luolin company that China introduced and the band finishing mill of De Make company.Its roll gap checkout gear has two test rods that contact with roller neck respectively, and they link to each other with displacement transducer by a leverage.The structure of this checkout gear is complicated, and outside measuring stick is exposed to, so relatively harsher to environment requirement.In addition, the machine driving link of this checkout gear is many, and dynamic response is relatively poor, has not only influenced accuracy of detection, and has influenced the real-time control to roll gap.

The roll gap checkout gear that the purpose of this invention is to provide the four-high mill that a kind of accuracy of detection is higher, dynamic response is good.

The solution that realizes the object of the invention is: the roll gap checkout gear of the four-high mill that is provided is by upper and lower detection bearing, two both sides that are symmetrically placed in the operation roll of mill center of being set in operation roll of mill roll neck part, and the double-piston hydraulic detection cylinder that is positioned between upper and lower detection bearing is formed with the differential transformer displace that is contained in detection cylinder piston.Wherein detect cylinder and connect firmly on rolling-mill housing, the upper and lower piston rod that detects cylinder closely contacts with upper and lower detection bearing, and the body part of above-mentioned differential transformer displace and core bar part are packed in respectively in the upper and lower piston that detects cylinder.When the operation roll of mill position of center line changes, be that roll gap is when changing, the position of upper and lower detection bearing also produces relatively thereupon and changes, closely two piston rods of the detection cylinder of contact are passed to sensor body and core bar with this movable signal with it, make it produce relative displacement, and be transformed into electric signal and output to signal processor, so that carry out the closed-loop control of roll gap.

Owing to detect on the bearing and be provided with two detection cylinders that are symmetrical in the working roll center, in the piston of each detection cylinder a displacement transducer is housed all, connect firmly on rolling-mill housing and detect cylinder, so with the algebraical sum of the signal of these two sensors during as feedback loop output signal, get final product elimination by the swing or the caused interference of translation that detect bearing, and can not bring influence control signal.In addition, the present invention has adopted the higher differential transformer displace of dynamic response frequency, and directly is contained in the roll neck part of working roll, and the transmission link of displacement signal is few, so not only accuracy of detection is higher, and dynamic response is better.

Above said working roll roll neck partly mean and smaller diameter portion except that the working roll working portion comprise bearings mounted section and the section adjacent with the working roll working portion.

Compared with prior art, of the present invention simple in structure, convenient for installation and maintenance.Because sensor is encapsulated in the piston that detects cylinder, thus safety, reliable, and can be used for the relatively poor occasion of environmental condition, as can be used for the roll gap detection of blooming mill, hot-rolling mill.

Below in conjunction with accompanying drawing content of the present invention is described in detail.

Fig. 1 is the structure chart of first embodiment of the invention.

Fig. 2 is the structure chart of second embodiment of the invention.

Fig. 3 is the position view that detects bearing among Fig. 2.

As shown in Figure 1: in the present embodiment that the bearing block 3,4 of the upper and lower working roll 1,2 of milling train is direct as detecting bearing.Upper and lower bearing block 3,4 is a T shape, is provided with the guiding that connects firmly on rolling-mill housing 5 (claiming mill housing again) between its ear and inserts 6, and this guiding inserts 6 again as the cylinder body that detects cylinder 7.Detect the piston that cylinder 7 has two hollows, wherein the inner chamber of lower piston 9 is inserted in the lower end of upper piston 8, thereby the inner chamber of upper and lower piston and the oil pocket A of cylinder body are isolated.The body 10 of differential transformer displace is packed in the inner chamber of upper piston 8, and cell winding is contained in the body 10, and its lead-out wire is drawn by the outlet 11 on upper piston rod top; The core bar 12 and the iron core thereof of sensor then are packed in the inner chamber of lower piston 9.During work, fill the constant voltage oil with suitable pressure in the oil pocket A that detects cylinder, upper and lower piston 8,9 is stretched out, and holds out against upper and lower bearing block 3,4; If oppositely logical oil, then piston-retraction.When working roll 1,2 stressed bendings or other factors change roll gap, also will there be corresponding variation the position of working roll roll neck part, and then the position of bearing block 3,4 changes thereupon, and this change in displacement is reached sensor.Because it is less to detect the piston effective area of cylinder, and the impulse stroke of piston is very little, so as long as impose enough oil pressure, can obtain the better dynamic response characteristic.Number among the figure: 13-top backing up roll, 14-lower support roller.

Fig. 2 is a most preferred embodiment of the present invention.Two T shapes are detected bearings 21,22 and are set in the roll neck section adjacent with the working portion of working roll 1,2, promptly detect bearing between the working portion 23 of working roll and bearing block 26 (referring to Fig. 3).Detect between bearing 21,22 and the roll neck 24 and be provided with supporting roller 25, detection bearing 21, roller 25 and roll neck 24 are abutted against together.Other structure of this example is identical with a last example.Owing to detect the working portion of bearing, so accuracy of detection is higher near working roll.

This device is used for the band finishing mill, and rolling thickness is 0.2～0.5MM, and its precision can be controlled in ± 0.003MM～± 0.005MM.

Claims

1, the roll gap checkout gear of four-high mill, it is characterized in that by be set in operation roll of mill roll neck part on, following detection bearing (3,4,21,22), two both sides that are symmetrically placed in the operation roll of mill center, and be positioned at, double-piston hydraulic between following detection bearing detects cylinder (7) and is contained in and detects cylinder piston (8,9) differential transformer displace in is formed, wherein detecting cylinder (7) connects firmly on rolling-mill housing, on the detection cylinder (7), lower piston rod and last, following detection bearing closely contacts, the body part of above-mentioned differential transformer displace (10) and core bar part (12) be packed in respectively detect cylinder on, lower piston (8,9) in.

2, roll gap checkout gear as claimed in claim 1, it is characterized in that said detection bearing (21,22) is set in the roll neck section adjacent with the working portion (23) of working roll, detect between bearing (21,22) and the roll neck (24) and be provided with supporting roller (25).

3, roll gap checkout gear as claimed in claim 1 is characterized in that said detection bearing is the bearing block of working roll.