CN203330134U - Tube seam detecting and controlling system of cold pilger mill - Google Patents

Abstract

The utility model relates to a tube seam detecting and controlling system of a cold pilger mill. The system comprises a PLC, a human machine interface (HMI), a main motor speed regulating device, a solenoid valve relay, an inlet chuck and outlet chunk hydraulic device, an eddy annular tube seam detecting instrument (1), a feed-in motor driving device and a mainframe encoder, wherein the HMI, the eddy annular tube seam detecting instrument (1) and the feed-in motor driving device are connected with the input end of the PLC respectively, the output end of the PLC is connected with the main motor speed regulating device and is connected with the inlet chuck and outlet chunk hydraulic device through the solenoid valve relay respectively, and the mainframe encoder is connected with the input end of the feed-in motor driving device. The tube seam detecting and controlling system of the cold pilger mill can avoid errors of manual observations, improve production efficiency comprehensively, and can also enable the cold pilger mill to achieve high-speed full automatic production.

Description

A kind of cold pilger mill pipe seam detects control system

Technical field

The utility model relates to a kind of cold pilger mill pipe seam and detects control system.

Background technology

Along with China's expanding economy, in recent years at a large amount of cold rolling seamless steels of domain requirement such as nuclear power, thermoelectricity, chemical fertilizer, chemical industry, chemical fibre, medical and health, food, oil drilling, bearing manufacturing, coal mining, space flight and aviation and war industrys, the steel pipe that simultaneously China every year also will be a large amount of to state's outer vent, so market wilderness demand high-speed full-automatic cold pilger mill.In the high-speed cold Pilger mill production process, when the pipe seam of two tubing in front and back enters main engine bed, due to speed, the operator can't observe the particular location of pipe seam in time.Due to the uncertainty of pipe seam position, the operator also can't accomplish the coordination to each parts of milling train accordingly, easily causes following fault: 1, the entrance chuck is not opened in time, and pipe end breaks the entrance chuck; 2, the outlet chuck is not opened in time, and pipe end breaks the outlet chuck, and causes the plug pass to damage, the vexed car of milling train; 3, pulling off device is not worked in time fast, causes two tubing to pitch mutually or squeeze simultaneously in the hollow shaft of outlet chuck, can't take out; When 4, pipe seam enters the rolling district, the timely reduction of speed of main frame, before and after causing, two pipes are pitched mutually, cause production accident.

The utility model content

The purpose of this utility model is to provide a kind of cold pilger mill pipe seam and detects control system and method, to overcome the defect existed in prior art.

The technical solution of the utility model is: a kind of cold pilger mill pipe seam detects control system, it is characterized in that:

Comprise PLC controller, Human machine interface, main motor speed control device, solenoid relay valve, gateway chuck hydraulic means, eddy current annular pipe seam detecting instrument, send motor driver and host code device to; Wherein,

PLC controller input connects respectively Human machine interface, eddy current annular pipe seam detecting instrument and sends motor driver to, the PLC controller output end connects respectively main motor speed control device and is connected gateway chuck hydraulic means by solenoid relay valve, sends the motor driver input to and is connected with the host code device.

Described Human machine interface is connected with the PLC controller by Ethernet;

Described pipe seam eddy current testing device is connected with the PLC controller by cable;

The described motor driver of sending to is connected with the PLC controller by optical fiber;

Described PLC controller is connected with main motor speed control device by the Profibus_DP net;

The output of described PLC controller is connected with solenoid relay valve by cable;

Described solenoid relay valve is connected with entrance chuck hydraulic means by control cables;

Described host code device by the encoder cable with send motor driver to and be connected.

Technical result of the present utility model is:

The each several part action of cold pilger mill is also adjusted in the pipe seam position of the cold pilger mill of existing low speed production during by artificial observation rolling, the cold pilger mill of high-speed production is because speed (nearly 200 beats/mins) can not rely on the manual observation pipe seam fully, the uncertain meeting of pipe seam position brings many production accidents, the assurance that the quality of product also can't obtain, also can't realize the full-automation production of cold pilger mill simultaneously.The utility model can be avoided artificial error of observing, and enhances productivity comprehensively, also can realize the high-speed full-automatic production of pipe mill.

The utility model is simple in structure, perfect in shape and function, reliability control system are high, different tube diameters safety, the continuous production requirement of high-speed full-automatic can be met, and the production accident brought due to pipe seam situs ambiguus and each position exercise not harmony of milling train can be greatly reduced.

The utility model utilizes encoder and EDDY CURRENT element to change into the problem of rolling number of times the real-time test problems of original pipe seam, and the formula simultaneously theory analysis obtained, be compiled into software by PLC, and this is two keys of this design.Because enter in the operation of rolling of main engine bed 10 at pipe seam, the relative distance of pipe seam is because metal rolled distortion is not linear change, it is the real-time change that occurs in along with flow of metal, and after the replacing production specification, also different variations can occur, if detect its relative position, checkout equipment is huge, expensive, and implements difficult.The utility model is the detection of relative position and control, convert statistics and the control of rolling number of times to, make the hardware design of whole system simple, only need detecting element seldom, utilize dexterously the calculating sum counter function of PLC, realized that full automatic cold pilger mill pipe seam detects control system simultaneously.

The accompanying drawing explanation

Fig. 1 is pipe mill main engine bed part overall structure schematic diagram;

Fig. 2 is the utility model hardware configuration structure schematic diagram;

Fig. 3 is that deformation section is sent schematic diagram to;

Fig. 4 is the control system flow chart.

Reference numeral is:

1-eddy current annular pipe seam detecting instrument, 2-entrance chuck, the metal pipe material that 3-rolling is sent to, rolling the first point in 4-rolling district, 5-rolling groove, 6-just metal pipe materials at rolling deformation, rolling on 7-plug completes a little, 8-complete tubing after rolling, 9-outlet chuck, 10-main engine bed, L ₁the distance of-eddy current annular pipe seam detecting instrument and entrance chuck jaws front end, L ₂the distance of-entrance chuck jaws front end and claw end, L ₃the distance of first of rolling in the rolling district in-entrance chuck jaws end and main engine bed, L ₄in-rolling district, first of rolling completes distance a little, L to rolling on plug ₅-rolling completes a little to the distance that exports the chuck jaws end, D ₀-pipe external diameter, t ₀-pipe wall thickness, 11-tubing, 12-plug, t ₁-production tube wall thickness, D ₁-Cheng Pingguan external diameter, S-feed, L _b-deformation section length.

The specific embodiment

The utility model belongs to metallurgical equipment, definitely says the pipe seam detection computations control system of fully automatic high-speed cold pilger mill.It can effectively guarantee that cold pilger mill is in the high-speed rolling process, and all parts of pipe mill is made corresponding adjustment according to the physical location of pipe seam, to meet the demand of high-speed production.

Referring to Fig. 1 to Fig. 3, the concrete structure that a kind of cold pilger mill pipe seam that the utility model relates to detects control system is:

Comprise PLC controller, Human machine interface, main motor speed control device, solenoid relay valve, gateway chuck hydraulic means, eddy current annular pipe seam detecting instrument 1, send motor driver and host code device to; Wherein,

PLC controller input connects respectively Human machine interface, eddy current annular pipe seam detecting instrument 1 and sends motor driver to, the PLC controller output end connects respectively main motor speed control device and is connected gateway chuck hydraulic means by solenoid relay valve, sends the motor driver input to and is connected with the host code device.

The PLC controller is the organ of this control system,

Human machine interface is as the input information output mechanism of this control system,

Main motor speed control device is controlled main motor lifting speed,

Gateway chuck solenoid relay valve and hydraulic means thereof move for the opening and closing of controlling the gateway chuck,

Eddy current annular pipe seam detecting instrument 1 is for detection of pipe seam arrival signal,

Send motor driver to and be used for controlling the action drives blank tubing of sending to send servomotor to and advance,

The host code device is for reacting mainframe real-time speed and position.

Human machine interface in the utility model can be connected with the PLC controller by Ethernet;

Described pipe seam eddy current testing device can be connected with the PLC controller by cable;

The described motor driver of sending to can be connected with the PLC controller by optical fiber;

Described PLC controller can be connected with main motor speed control device by the Profibus_DP net;

The output of described PLC controller can be connected with solenoid relay valve by cable;

Described solenoid relay valve can be connected with entrance chuck hydraulic means by control cables;

Described host code device can by the encoder cable with send motor driver to and be connected.

A kind of cold pilger mill pipe seam that the utility model relates to detects control method, comprises following steps:

1] distance L with entrance chuck jaws front end by the good eddy current of Human machine interface input measurement annular pipe seam detecting instrument 1 ₁, entrance chuck jaws front end and claw end distance L ₂, the distance L of first of rolling in the rolling district in entrance chuck jaws end and main engine bed ₃, first of rolling completes distance L a little to rolling on plug in the rolling district ₄, rolling completes some the distance L of outlet chuck jaws end ₅;

2] calculate by the program in input PLC the distance L that pipe seam is covered respectively eddy current annular pipe seam detecting instrument and entrance chuck jaws front end ₁, entrance chuck jaws front end and claw end distance L ₂, the distance L of first of rolling in the rolling district in entrance chuck jaws end and main engine bed ₃, first of rolling completes distance L a little to rolling on plug in the rolling district ₄, rolling completes some the distance L of outlet chuck jaws end ₅different rolling number of times;

3] arrive the distance L of eddy current annular pipe seam detecting instrument and entrance chuck jaws front end when pipe seam ₁the time, program is exported automatically, by the output of PLC controller, connects solenoid relay valve and gateway chuck hydraulic means, opens entrance chuck 2;

4] reach L to the distance of entrance chuck jaws front end and claw end when pipe seam ₂the time, program is exported automatically, by the output of PLC controller, connects solenoid relay valve and gateway chuck hydraulic means, closes entrance chuck 2;

5] distance L of first of rolling in the rolling district in pipe seam arrives entrance chuck jaws end and main engine bed ₃the time, program is exported automatically, and the PLC controller is down to 80% of original speed by main motor speed control device by main frame speed, and the main frame reduction of speed reacts to the host code device, reduces and to send motor to and send frequency to by sending motor driver to simultaneously.

6] in pipe seam arrives the rolling district, first of rolling completes distance L a little to rolling on plug ₄the time, program is exported automatically, and the output by the PLC controller is connected outlet chuck 9 and opened solenoid relay valve and open outlet chuck 9, after outlet chuck 9 being detected and opening, pull out fast the roller-way machine operation, the last tubing that rolling is good is pulled out from plug 12 fast;

7] when arriving rolling, pipe seam completes a little to the distance L that exports the chuck jaws end ₅the time, program is exported automatically, connect outlet chuck 9 shut electromagnetic valve cut-off outlet chucks 9 by the output of PLC controller, the PLC controller by main motor speed control device by the main frame raising speed to normal operation speed, after the main frame raising speed, reaction is to the host code device, raising is simultaneously sent motor to and is sent frequency to, and program recovery is to original duty.

Step 4 in the utility model] in, the PLC controller is netted and is connected main motor speed control device and main frame speed is down to 80% of original speed by Profibus_DP;

Described step 6] in, the PLC controller by Profibus_DP net connect main motor speed control device and by the main frame raising speed to normal operation speed, program recovery is to original duty.

Step 1 in the utility model] in, pipe seam is in the distance L of eddy current annular pipe seam detecting instrument and entrance chuck jaws front end ₁interior rolling frequency n ₁for: n ₁=L ₁/ S;

Pipe seam is in the distance L of entrance chuck jaws front end and claw end ₂interior rolling frequency n ₂for: n ₂=L ₂/ S;

Pipe seam distance L of first of rolling in the rolling district in entrance chuck jaws end and main engine bed ₃interior rolling frequency n ₃for: n ₃=V _b/ V _a, wherein, V _a=π st ₀(D ₀-t ₀),

$V_b=\frac{{\mathrm{\&pi;L}}_b}{6}[D_0({2\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA00003461301000022.png"\; state="\{\{state\}\}">t</figure-callout>}}_0+t_1)+D_1({2\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA00003461301000011.png,HDA00003461301000022.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+t_0)-{2\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA00003461301000022.png"\; state="\{\{state\}\}">t</figure-callout>}}_0^2-{2\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA00003461301000011.png,HDA00003461301000022.png"\; state="\{\{state\}\}">t</figure-callout>}}_1^2-{2t}_0{t}_1],$ S is feed, t ₀for pipe wall thickness, D ₀for pipe external diameter, t ₁for production tube wall thickness, L _bfor deformation section length;

Pipe seam first of rolling in the rolling district completes distance L a little to rolling on plug ₄interior rolling frequency n ₄for: n ₄=L ₄/ S ₁, wherein, S ₁=λ S, λ=(D ₀-t ₀) t ₀/ (D ₁-t ₁) t ₁, λ is lengthening coefficient, D ₀for pipe external diameter, t ₀for pipe wall thickness, D ₁for production tube external diameter, t ₁for production tube wall thickness, S ₁for distortion completes the each actual feed of production tube;

Pipe seam completes a little to the distance L that exports the chuck jaws end in rolling ₅interior rolling frequency n ₅for: n ₅=L ₅/ S ₁, S ₁for distortion completes the each actual feed of production tube.

As depicted in figs. 1 and 2, before pipe mill main engine bed 10, the afterbody of lathe bed is installed an eddy current annular pipe seam detecting instrument 1.Measure respectively the distance L of eddy current annular pipe seam detecting instrument and entrance chuck jaws front end ₁, the distance L of entrance chuck jaws front end and claw end ₂, the distance L of first of rolling in the rolling district in entrance chuck jaws end and main engine bed ₃, in the rolling district, first of rolling completes distance L a little to rolling on plug ₄, rolling completes a little to the distance L that exports the chuck jaws end ₅.These values are input in the middle of man-machine interface (HMI) to the program that enters PLC by man-machine interface.

At the front end of main engine bed 10, an eddy current annular pipe seam detecting instrument 1 is installed, after pipe seam enters eddy current annular pipe seam detecting instrument 1, eddy current annular pipe seam detecting instrument 1 sends the signal that can receive to PLC, and now PLC calls the pipe seam trace routine of having finished.In conjunction with angle and the speed for the recording rolling that are loaded on the main spindle box side, can change out thus the encoder of the rolling number of times in LAP, complete the control work of pipe seam at position each parts of pipe mill.The main thought of this control system is exactly known length to be converted into to the rolling number of times of every section by calculating.

Before entering eddy current annular checkout gear, pipe seam do not belong to the normal operation of rolling of milling train.Now the gateway chuck is all in closed condition, and the milling train main frame runs up to guarantee quality and the production efficiency of production tube.After pipe seam enters annular surveyed area, the first step calculates by program the distance L that pipe seam is covered respectively eddy current annular pipe seam detecting instrument and entrance chuck jaws front end ₁, entrance chuck jaws front end and claw end distance L ₂, the distance L of first of rolling in the rolling district in entrance chuck jaws end and main engine bed ₃, first of rolling completes distance L a little to rolling on plug in the rolling district ₄, rolling completes some the distance L of outlet chuck jaws end ₅different rolling number of times; Second step is when the distance L of pipe seam arrival eddy current annular pipe seam detecting instrument and entrance chuck jaws front end ₁during initiating terminal, program output is automatically opened the entrance chuck; The 3rd step is when the distance L of pipe seam arrival entrance chuck jaws front end and claw end ₂during initiating terminal, program output is automatically closed the entrance chuck; The 4th step arrives the distance L of first of rolling in entrance chuck jaws end and the interior rolling of main engine bed district when pipe seam ₃during initiating terminal, program is exported the main frame reduction of speed automatically to 80% of original speed; The 5th step completes distance L a little when pipe seam arrives in the rolling district first of rolling to rolling on plug ₄during initiating terminal, program output is automatically opened the outlet chuck, pulling off device work fast subsequently, and the last tubing that rolling is good is pulled out fast; The 6th step completes a little to the distance L that exports the chuck jaws end when pipe seam arrives rolling ₅during initiating terminal, program output is automatically closed the outlet chuck, the main frame automatic raising speed, and program recovery is to original duty.

Due to pipe seam real time position checkout equipment more complicated, costliness and can't install in main engine bed, therefore need to the real time position of pipe seam be detected by program to the detection that is converted into the rolling number of times, the difficult point of software programming and key point, be exactly how known length numerical value to be converted to the rolling numerical value that real number calculates, and, in conjunction with the PLC output signal, complete accurately and timely control procedure.At first need to calculate L by program ₁the number of times of interior rolling, pipe is at L ₁inside send in process and change due to rolling not occurring, pipe does not deform, and the each feed of definable is S, and the rolling number of times that pipe seam enters after the EDDY CURRENT element is n.Therefore at L ₁interior rolling frequency n ₁just directly formula can be arranged:

n ₁=L ₁/S ①

Obtain at L by that analogy ₂interior rolling frequency n ₂formula be:

n ₂=L ₂/S ②

Tubing 11 is entering L ₃rear generation rolling deformation, as shown in Figure 3.Volume after tubing is sent S to when not entering deformed area at every turn is a hollow round table, and the volume that defines this hollow round table is V _a, release formula according to Fig. 3:

V _a=πst ₀(D ₀-t ₀) ③

, send S at every turn to and just have certain extension after by rolling through groove rolling generation flow of metal due to the tubing in the rolling district.As shown in Figure 3, tubing can be equivalent to one section hollow frustum of a cone at the volume of whole rolling deformation section.Defining this hollow frustum of a cone volume is V _b, release formula according to Fig. 3:

$V_b=\frac{{\mathrm{\&pi;L}}_b}{6}[D_0({2\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA00003461301000022.png"\; state="\{\{state\}\}">t</figure-callout>}}_0+t_1)+D_1({2\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA00003461301000011.png,HDA00003461301000022.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+t_0)-{2\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA00003461301000022.png"\; state="\{\{state\}\}">t</figure-callout>}}_0^2-{2\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA00003461301000011.png,HDA00003461301000022.png"\; state="\{\{state\}\}">t</figure-callout>}}_1^2-{2t}_0{t}_1]$ ④

According to the principle of constancy of volume after flow of metal, L ₃deformed area send frequency n to ₃should be for the tubing cumulative volume of deformed area divided by the volume of sending at every turn, that is:

n ₃=V _b/V _a ⑤

When tubing enters L ₄the time flow of metal complete, the lengthening coefficient of each feed is defined as to λ.Lengthening coefficient is exactly the ratio of pipe cross-sectional area and production tube cross-sectional area.By the known quantity of technological parameter, the pipe D outer diameter ₀, pipe wall thickness t ₀, the production tube D outer diameter ₁, production tube wall thickness t ₁, can calculate λ, that is:

λ=(D ₀-t ₀)t ₀/(D ₁-t ₁)t ₁ ⑥

Because metal volume after flow of metal is unchanged, the variation of cross-sectional area causes the actual feed of production tube to change, and according to lengthening coefficient λ, can extrapolate and be out of shape the each actual feed of production tube, and defining this feed is S ₁that is:

S ₁=λS ⑦

At L ₄interior total rolling number of times:

n ₄=L ₄/S ₁ ⑧

Tubing enters L ₅the time be to complete district in distortion equally, according to L ₄the formula of section can be extrapolated L ₅the rolling number of times of section, that is:

n ₅=L ₅/S ₁ ⑨

Utilize encoder and EDDY CURRENT element to change into the problem of rolling number of times the real-time test problems of original pipe seam, the formula simultaneously theory analysis obtained, be compiled into software by PLC, and this is two keys of this design.Because enter in the operation of rolling of main engine bed 10 at pipe seam, the relative distance of pipe seam is because metal rolled distortion is not linear change, it is the real-time change that occurs in along with flow of metal, and after the replacing production specification, also different variations can occur, if detect its relative position, checkout equipment is huge, expensive, and implements difficult.The utility model is the detection of relative position and control, convert statistics and the control of rolling number of times to, make the hardware design of whole system simple, only need detecting element seldom, utilize dexterously the calculating sum counter function of PLC, realized that full automatic cold pilger mill pipe seam detects control system simultaneously.In order to calculate and to control and showing, be designed with CPU, the Human machine interface of control able to programme, and set up the network connection of whole system, as shown in Figure 2.

The flow chart that Fig. 4 is this control system, when eddy current testing device detects pipe seam and enters, this device sends signal to PLC as shown in the figure, and PLC calls the pipe seam trace routine write.

At first record the interior rolling number of times of distance L 1 of eddy current annular pipe seam detecting instrument and entrance chuck jaws front end.We can reflect real-time rolling angle by the encoder that is arranged on crankcase side, because pipe mill is a reciprocating duty, can reciprocating motion be converted into to a circular motion by a reduction box.Encoder can be learnt pipe mill mainframe position by the reaction circular motion, and every bit or each scope in the middle of circular motion are different, therefore only need to record the number of times that the unspecified angle scope is passed by, and can obtain corresponding rolling number of times.Numerical value comparison module and counter module by PLC just can complete this task.Connect an intermediate variable during angular range when encoder by setting, allow the input that this intermediate variable is counter module CU1 simultaneously, 1. formula transfers the data presetting amount of this counter to simultaneously.When the rolling number of times arrives n ₁the time, an intermediate variable of counter module output.Open the entrance chuck by this intermediate variable, connect the input of the counter CU2 in the L2 zone simultaneously.Analogize the process of follow-up each section according to the process of L1, when the rolling number of times reaches corresponding rolling frequency n successively ₂, n ₃, n ₄, n ₅the time, counter module CU2, CU3, CU4, CU5 exports respectively an intermediate variable, and these intermediate variables are connected the interior action of flow process separately accordingly.N ₂close the entrance chuck during arrival, n ₃engine reduced power during arrival (according to the speed of technological requirement), n ₄open the outlet chuck during arrival, simultaneously fast drawing device starts the good steel pipe by rolling pulls out rapidly, n ₅close the outlet chuck during arrival, the main frame raising speed is to normal mill speed simultaneously.

The parts that the present embodiment does not describe in detail and structure belong to well-known components and common structure or the conventional means of the industry, here not narration one by one.

Claims (2)

1. a cold pilger mill pipe seam detects control system, it is characterized in that: comprise PLC controller, Human machine interface, main motor speed control device, solenoid relay valve, gateway chuck hydraulic means, eddy current annular pipe seam detecting instrument (1), send motor driver and host code device to; Wherein, PLC controller input connects respectively Human machine interface, eddy current annular pipe seam detecting instrument (1) and sends motor driver to, the PLC controller output end connects respectively main motor speed control device and is connected gateway chuck hydraulic means by solenoid relay valve, sends the motor driver input to and is connected with the host code device.

2. the cold pilger mill pipe seam detects control system according to claim 1, it is characterized in that:

Described Human machine interface is connected with the PLC controller by Ethernet;

Described pipe seam eddy current testing device is connected with the PLC controller by cable;

The described motor driver of sending to is connected with the PLC controller by optical fiber;

Described PLC controller is connected with main motor speed control device by the Profibus_DP net;

The output of described PLC controller is connected with solenoid relay valve by cable;

Described solenoid relay valve is connected with entrance chuck hydraulic means by control cables;

Described host code device by the encoder cable with send motor driver to and be connected.

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