CN216095573U - Core rod breakage detection device for seamless steel tube cold rolling mill - Google Patents

Abstract

The utility model discloses a mandrel breakage detection device for a seamless steel tube cold rolling mill, which comprises a supporting seat, a bracket, a guide sleeve and an electromagnetic coil, wherein the supporting seat is provided with a support seat; the bracket is arranged on the supporting seat; the guide sleeve penetrates through the supporting seat and the bracket and is arranged on the supporting seat and the bracket; the electromagnetic coil is sleeved on the guide sleeve and is fixed on the bracket. The utility model realizes the real-time detection of the horizontal displacement of the magnetic guide rod at the foremost end of the core rod (top) in rolling by the non-contact real-time detection of the magnetic force line of the annular high-magnetic coil.

Description

Core rod breakage detection device for seamless steel tube cold rolling mill

Technical Field

The utility model relates to equipment for producing and processing seamless steel tubes in the industries of metallurgy, machinery and the like, in particular to a mandrel crack detection device for a seamless steel tube cold rolling mill, which is particularly suitable for a two-roller periodic seamless steel tube cold rolling mill with a finished tube diameter of more than 15mm and a rolling speed of not less than 100 times per minute, and an on-line detection device for mandrel crack in cold rolled tube production

Background

The common metallurgical products of the seamless steel pipe can be finished through a plurality of working procedures in the production and processing process of the seamless steel pipe, and the cold rolling deformation processing is a widely adopted seamless steel pipe production mode at present. The seamless steel pipe cold rolling technology has become the main mode of seamless steel pipe production and processing at present due to the characteristics of high rolling precision, high speed, high productivity, high yield, easy production organization and process technology adjustment and the like, and a two-roll periodic cold rolling mill is the most common seamless steel pipe cold rolling processing production equipment.

The two-roller periodic cold pilger mill mainly comprises a rolling mechanism, a feeding and rotating mechanism, a transmission mechanism, a mandrel rotating mechanism, a lathe bed supporting mechanism, a feeding and blanking mechanism, a hydraulic system, a process lubricating system, an electric automatic control system, a pneumatic system, an auxiliary mechanism and the like. The rolling mechanism mainly comprises a machine base, a working machine frame, a roller, a slideway, a rack, a deformation tool and the like, wherein the machine base is of a frame structure and is integrally installed on a reinforced concrete foundation to provide an installation and running station for the whole rolling mechanism. The working frame is a frame structure with an open top, is integrally installed in the machine base and is connected and fixed with the horizontal connecting rod of the transmission mechanism through ear seats on two sides of the machine base, and the contact surfaces (including the upper, the lower, the left and the right) of the machine base and the machine base are provided with slide ways (sliding plates) which are used as wearing parts, and the running clearance generated by the motion abrasion of the machine base in the machine base can be eliminated after the machine base is periodically replaced. The rack is composed of a left auxiliary transmission rack and a right auxiliary transmission rack which are respectively arranged at two sides of the base. The roller consists of an upper roller and a lower roller which are installed in a working frame in pairs, and the reciprocating horizontal motion of the transmission mechanism in the frame through a horizontal connecting rod and a motor frame is converted into the synchronous rotating motion of the upper roller and the lower roller through the meshing motion of a cylindrical gear at the end part of the roller and racks at two sides of the motor frame. The deformation tool consists of a hole pattern and a plug (containing a core rod), wherein the hole pattern is respectively installed in the middle of an upper roller and a lower roller in pairs, rolling deformation grooves are machined on the outer circumferential surface of the hole pattern, the deformation grooves are smooth continuous curved surfaces formed by continuous arcs with different radiuses and concentric diameters, and the hole pattern rolling grooves on the upper roller and the lower roller are spliced to form a concentric diameter-variable conical hole from large to small. The top head is a slender cone, the tail part of the top head is connected with the core rod through threads, threaded holes are machined in the end face of the head part of the top head and used for installing magnetic guide rods, the cone of the top head is inserted into the conical holes formed by the hole patterns to jointly form a continuous smooth circular ring from large to small, and the normal-temperature deformation machining of the tube blank is realized through the circular ring. The technical parameters of the top and the ring hole type can be selected according to the diameters and the wall thicknesses of different tube blanks and finished tubes, so that the using state of the top not only directly influences the quality and the efficiency of the cold-rolled tube, but also is a key factor influencing the running stability of the whole rolling mechanism and the faults of the roller and the ring hole type.

The cold rolling deformation (processing) movement process of the seamless steel tube mainly comprises the horizontal movement and the rotary movement of a tube blank (blank tube), wherein in the cold rolling deformation processing, the horizontal movement is the main movement, and the rotary movement is the auxiliary movement. The horizontal movement is the movement of the pipe blank in the horizontal direction under the driving of power, the movement is to drive the pipe blank to pass through a circular ring consisting of a hole pattern and a top head, and the feed amount is taken as a parameter of the equivalent of the horizontal movement; the rotary motion is that the tube blank is driven by power to do synchronous rotary motion along with horizontal motion, the motion is that a top head and the tube blank rotate in an annular ring type rolling groove, the roundness of the tube blank is ensured as a target, and the rotation amount is used as a parameter of the rotary motion. In production practice, faults such as fracture, breakage, axial escape and the like easily occur in the process of rolling the plug, and particularly, the faults are frequent for a high-speed rolling mill with the rolling speed of more than 110 times per minute. Meanwhile, when the finished product of the seamless steel pipe with small specification and the external diameter of phi 15-phi 25mm is rolled, the fault is easy to occur. In the production of cold rolled pipes, once the top is abnormal, if the top cannot be found and judged in time and is stopped for disposal, the damage to seamless steel pipes and the damage to components such as rollers can be caused directly. Because the rolling mechanism adopts a closed box structure, the noise is high during rolling, and operators cannot find the abnormality of the ejector and the mandrel through the traditional modes of visual inspection, ear listening and the like, a mandrel (ejector) breakage detection device is usually arranged on one side of the outlet end of the box body of the rolling mechanism and is used for monitoring the running states of the ejector and the mandrel, and once the abnormality is found, the program logic is set and the machine is automatically stopped.

The whole set of mandrel device consists of four parts, wherein the magnetic guide rod, the top head, the mandrel and the tail cone are sequentially arranged from the front end, the magnetic guide rod is fixed at the foremost end (small-diameter end) of the top head through a thread structure, the top head is connected and fixed with a threaded hole at the front end of the mandrel through a tail thread section, and the tail cone is fixed at the tail end of the mandrel through a thread structure. During rolling, the tail cone of the mandrel is fixed in a machine body under the action of a mandrel chuck element, an inner hole of a tube blank penetrates through the outer diameter of the mandrel and enters a rolling mechanism, and through an infinite number of containing rings formed by a ring hole type and a top head from large to small, cold rolling deformation processing of the seamless steel tube is realized, the outer diameter is controlled by the ring hole type, the inner diameter is controlled by the top head, and the wall thickness is controlled by superposing the ring hole type and the top head. Because the top head bears the important function of rolling deformation, the load borne by the whole set of mandrel components is the largest, and faults are most likely to occur, and the common faults are top head breakage, bending, thread failure and the like, so the running stability of the top head and the mandrel components directly influences the orderly running of equipment, and the effective monitoring of the mandrel fracture detection device is of great importance to the improvement of the running quality of the seamless steel tube cold rolling mill.

The core rod breakage detection device used at present is a third generation of domestic improvement, a high-magnetic probe is adopted to replace an original electromagnetic coil, whether abnormity occurs or not is judged by sensing the axial position displacement of the magnetic guide rod at the front end of the top, and the detection efficiency is high. However, the coverage area and the penetrating power of the magnetic force line of the high-magnetic probe are relatively narrow, so that the requirement on the installation position is high, and in order to improve the sensitivity and the stability of online detection, measures such as processing right-angle sides on copper guide sleeves, arranging L-shaped brackets and the like are improved so as to meet the requirement of monitoring the mandril (top head) in real time when seamless steel pipes of different steel types and specifications are cold rolled.

For example, the detection device for detecting the cracking of the seamless steel tube high-speed cold rolling mill core rod disclosed in chinese patent No. ZL201620328063.4 can meet the technical requirement of online real-time detection of the high-speed cold rolling mill core rod (plug) with the rolling speed of 110-170 times per minute, but still has certain disadvantages, namely:

1) the installation and correction requirements of the high magnetic probe are high: the utility model discloses a two high magnetic probes that the design adopted are 90 degrees right angle systems, draw the stick through the magnetism of two bundles of crossing magnetic force lines perpendicularly to the top front end and detect, consequently, require higher to the installation accuracy of two high magnetic probes, need experienced high skill staff just can suffice.

2) The high magnetic probe has a detection blind area: because the two high-magnetic probes are intersected at a right angle of 90 degrees, and the magnetic lines of force of the high-magnetic probes penetrate linearly, the detection sensitivity in the mutually perpendicular intersection area of the magnetic lines of force is higher, the detection precision is obviously reduced once the high-magnetic probes are far away from the perpendicular intersection area, a certain blind area exists, and the detection precision is obviously reduced especially for novel steel types such as high-temperature alloy, nickel-based alloy and the like.

3) The whole device structure is complicated relatively, and the uide bushing needs the processing of cutting edge, and the power consumption is taken time: due to the installation and positioning of the L-shaped bracket and the penetrating requirement of magnetic lines of force, the copper guide sleeve needs to be trimmed by 90 degrees and needs to be matched with the L-shaped bracket and other elements of the high-magnetic probe, the processing period is long, and the requirement of quickly guaranteeing field operation and maintenance is not facilitated.

In summary, the existing seamless steel tube cold rolling mill core rod (plug) breakage online detection device has certain defects in field application, and needs to eliminate detection blind spots through corresponding technical improvement, further improves the detection precision, is convenient for field installation, use and maintenance, and creates conditions for improving the orderly operation of equipment. With the continuous progress of electrical detection technology and materials, electromagnetic coils, particularly high-magnetic coil technology, have been developed, and annular hollow high-magnetic coils are made available, so that the penetration of magnetic lines of force with 360 degrees and no dead angle can be realized. Therefore, aiming at the problem of the existing third-generation cold rolling mill core rod (top head) online detection device, the characteristics of the high-magnetic-coil technology are combined, corresponding technical improvement is carried out, the advantages and the disadvantages are made up to meet the production requirements of novel steel seamless steel pipes such as high-temperature alloy, nickel-based alloy and the like, and the online real-time detection precision and efficiency of the core rod (top head) are improved.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned drawbacks in the prior art, an object of the present invention is to provide a mandrel bar breakage detection apparatus for a seamless steel tube cold rolling mill, which realizes real-time detection of horizontal displacement of a magnetic guide bar at the foremost end of a mandrel bar (plug) during rolling by non-contact real-time detection of magnetic lines of force of an annular high-magnetic coil.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a mandrel breakage detection device for a seamless steel tube cold rolling mill comprises a supporting seat, a support, a guide sleeve and an electromagnetic coil;

the bracket is arranged on the supporting seat;

the guide sleeve penetrates through the supporting seat and the bracket and is arranged on the supporting seat and the bracket;

the electromagnetic coil is sleeved on the guide sleeve and is fixed on the bracket.

Preferably, the supporting seat comprises a bottom plate, and a front vertical plate and a rear vertical plate which are respectively welded at two end parts of the bottom plate;

the bottom flat plate is provided with two rectangular plates, and the bottom flat plate is provided with first threaded through holes;

the front vertical plate is arranged in a convex shape, a first threaded hole is formed in a step of the front vertical plate, and a concentric different-diameter step hole is formed in the front vertical plate;

the large-diameter end of the concentric different-diameter step hole is positioned on the outer side of the front vertical plate, and the small-diameter end of the concentric different-diameter step hole is positioned on the inner side of the front vertical plate;

the rear vertical plate is arranged in a convex shape, a second bolt hole is formed in the step of the rear vertical plate, a third bolt hole is formed in the top surface of the rear vertical plate, and a first circular through hole concentric with the concentric step hole with the different diameter is formed in the rear vertical plate.

Preferably, the top surface of the front vertical plate is provided with a rectangular groove, and the rectangular groove is communicated with the large-diameter end of the concentric different-diameter step hole.

Preferably, the bracket comprises a bottom plate, upright posts welded on two end parts of the bottom plate and upright post covers arranged on the tops of the upright posts;

the bottom plate is arranged into a rectangular plate, and a second threaded through hole is formed in the rectangular plate;

the top of the upright post is provided with a first semicircular groove and a fourth threaded hole;

and a second semicircular groove matched with the first semicircular groove and a fifth threaded hole matched with the fourth threaded hole are formed in the bottom of the upright post cover.

Preferably, the guide sleeve is provided with a concentric step-shaped cylinder with different diameters, and an axial second circular through hole is formed in the center of the cylinder.

Preferably, a guide chamfer is arranged at the end part of the second round through hole.

Preferably, the load current of the electromagnetic coil is 100mA, and the power voltage is 20-36V DC.

Preferably, the supporting seat and the bracket are made of Q-235A steel.

Preferably, the guide sleeve is made of red copper.

The mandrel breakage detection device for the seamless steel pipe cold rolling mill provided by the utility model has the following beneficial effects:

1) the cold rolled seamless steel tube has the advantages of reasonable design, simple and compact structure, convenient use, convenient maintenance, safety and reliability, and meets the technical requirements of cold rolled seamless steel tubes of high-temperature alloys, nickel-based alloys and other novel steel grades;

2) the electromagnetic coil with relatively mature quality is adopted to replace a high-magnetic probe, the advanced electrical detection technology is applied to the field of seamless steel pipe cold rolling, the improvement cost is low, the field implementation is easy, and the cost performance is relatively high;

3) the annular structure of the electromagnetic coil is convenient and fast to install, does not need to adjust stations, saves labor and time, reduces dependence on high-skill personnel, and creates conditions for realizing standardized operation;

4) the supporting seat is fixed on the front end lathe bed of the rolling mechanism through threads, the support is fixed in the supporting seat through threads, the mounting stability of the supporting seat, the support and the lathe bed is good, and a stable carrier is provided for precision detection;

5) the guide sleeve passes through the circular holes formed by the support seat, the support and the electromagnetic coil, so that a reliable station is provided for the precision detection of the annular magnetic force line without blind areas, the positioning is reasonable, the vibration resistance stability is good, and the faults of the electromagnetic coil are reduced;

6) the non-contact real-time detection of the magnetic force line of the annular high-magnetic coil is adopted, so that the real-time detection of the horizontal displacement of the magnetic guide rod at the foremost end of the core rod (top) in rolling is realized, the field application effect is good, and the device is practical and efficient;

7) the abnormal working condition of the core rod (top) is found and judged by the rod guiding horizontal displacement technology, the machine is stopped in time for troubleshooting and disposal, the damage to a rolling mechanism and a seamless steel pipe is reduced, the equipment maintenance and disposal cost is reduced, the functional precision construction of equipment is promoted, and the fault elimination and cost reduction effects are obvious;

8) the device has strong universality, and has certain reference and application values for the corresponding improvement of other two-roller periodic seamless steel tube cold rolling mills.

Drawings

FIG. 1 is a schematic front view of a core rod breakage detection apparatus of the present invention;

FIG. 2 is a schematic side view of the core rod breakage detection apparatus of the present invention;

FIG. 3 is a schematic top view of the core rod breakage detection apparatus of the present invention;

FIG. 4 is a schematic view of a backup pad in the apparatus for detecting a rupture of a mandrel bar according to the present invention, wherein (a) is a right side view, (b) is a front view, (c) is a left side view, and (d) is a top view;

FIG. 5 is a schematic view of a holder in the core rod breakage detecting apparatus of the present invention, wherein (a) is a front view, (b) is a left side view, and (c) is a top view;

FIG. 6 is a schematic view of a guide sleeve in the core rod breakage detecting apparatus of the present invention, wherein (a) is a sectional view and (b) is a front view;

FIG. 7 is a schematic view of an electromagnetic coil in the mandrel crack detection apparatus of the present invention;

FIG. 8 is a schematic view showing a state of use of the mandrel bar breakage detecting apparatus according to the present invention.

Detailed Description

In order to better understand the technical solutions of the present invention, the following further describes the technical solutions of the present invention with reference to the accompanying drawings and examples.

Referring to fig. 1 to 3, the mandrel bar breakage detection device for a seamless steel tube cold rolling mill provided by the utility model comprises a supporting seat 1, a bracket 2, a guide sleeve 3 and an electromagnetic coil 4.

The support base 1 is a support member of the mandrel bar breakage detection device of the present invention, and is mounted and fixed to a cold rolling mill housing.

The bracket 2 is arranged on the supporting seat 1 and used for fixing the electromagnetic coil 4 and the guide sleeve 3.

The guide sleeve 3 penetrates through round holes in the supporting seat 1, the support 2 and the electromagnetic coil 4 and is an installation station of a leading rod at the front end of the top and a magnetic line detection area.

The electromagnetic coil 4 is a high-magnetic coil, is arranged on the bottom plate of the bracket 2 in the middle, and realizes the function of real-time detection through magnetic lines of force.

Referring to fig. 4, the supporting seat 1 includes a bottom plate 101, and a front vertical plate 102 and a rear vertical plate 103 welded to two ends of the bottom plate 101, respectively, and are made of Q-235A steel material, and are welded to form a protruding frame structure.

The bottom plate 101 is provided with two rectangular plates, a first threaded through hole 104 at the position 2 is vertically processed on the plane of each rectangular plate, the circle center connecting line of the first threaded through hole 104 is parallel to the central line of the rectangular body in the length direction, and a group of corresponding hole distances between the two rectangular plates are equivalent to the second threaded through hole 204 on the bottom plate 201 of the support 2.

The front vertical plate 102 is in a convex shape, a concentric different-diameter step hole 106 is formed in the front vertical plate, the length of the large-diameter end step hole is 2/3 of the thickness of the front vertical plate 102, the aperture of the large-diameter end step hole is equal to that of the large-diameter side of the guide sleeve 3, the aperture of the small-diameter end step hole is equal to that of the small-diameter side of the guide sleeve 3, and the diameters of the concentric different-diameter step holes 106 are 0.15-0.25 mm smaller than the outer diameter of the guide sleeve 3.

The top surface of the front vertical plate 102 is provided with a rectangular groove 107, and the rectangular groove 107 is communicated with the large-diameter end of the concentric different-diameter step hole 106, so that the concentric different-diameter step hole 106 and the top of the front vertical plate 102 are opened.

One side of each of two ends of the front vertical plate 102 is of a vertical structure, the other side of each of the two ends of the front vertical plate 102 is of a circular arc shape and a connecting line of the circular arc shape, the width of each of the two sides of the front vertical plate 102 is smaller than that of a vertical side (for avoiding other elements), first threaded holes 105 are machined in the center of the step surfaces on the two sides of the front vertical plate 102 at equal intervals, and the center lines of the first threaded holes 105 are parallel to the end surfaces of the front vertical plate 102.

The rear vertical plate 103 is arranged in a convex shape, and is further provided with a first circular through hole 108 concentric with the concentric different-diameter step hole 106, and the diameter of the first circular through hole is equal to the diameter of the small-diameter end step hole of the concentric different-diameter step hole 106.

The top surface of the rear vertical plate 103 is provided with 2 third bolt holes 109 at the center at equal intervals, the lower half parts of the third bolt holes 109 are provided with triangular threads, and the center lines of the third bolt holes 109 are parallel to the end surface of the rear vertical plate 103.

Second bolt holes 110 at positions 2 are machined in the middle of the step of the rear vertical plate 103 at equal intervals, and the center line of each second bolt hole 110 is parallel to the end face of the rear vertical plate 103.

Referring to fig. 5, the bracket 2 includes a bottom plate 201, columns 202 welded to two ends of the bottom plate 201, and column covers 203 arranged on tops of the columns 202, and is made of Q-235A steel material, and is welded to form a square structure with a closed upper portion.

The setting of bottom plate 201 is the rectangular plate, processes 6 second screw through-holes 204 (three groups altogether) perpendicularly according to 2 lines 3 rows on the plane of cuboid, wherein 1 group second screw through-hole 204 processing triangle screw thread placed in the middle, and the pitch-row matches with round hole aperture, the aperture of solenoid 4 bottom, and 2 groups second screw through-holes 204's aperture, pitch-row and the dull and stereotyped 101 of both sides go up 2 groups first screw through-hole 104 phase-matchs.

The column 202 has 2 pieces, the top of which is provided with a first semicircular groove 205 and a fourth threaded hole 206, the circle center of the first semicircular groove 205 is coincident with the top surface of the column 202, the diameter of the first semicircular groove is equivalent to that of the small-diameter-end stepped hole of the concentric different-diameter stepped hole 106, and the positions of the fourth threaded hole 206 which are processed 2 are respectively positioned at two sides of the first semicircular groove 205.

The bottom of the column cover 203 is provided with a second semicircular groove 208 matched with the first semicircular groove 206 and a fifth threaded hole 209 matched with the fourth threaded hole 207, and the aperture of the second semicircular groove 208 is equivalent to that of the small-diameter end stepped hole of the concentric different-diameter stepped hole 106.

Referring to fig. 6, the guiding sleeve 3 is a concentric step-shaped cylinder with different diameters, made of red copper, and has an axial second circular through hole 301 formed at the center of the circle, the axis of the second circular through hole 301 coincides with the axis of the guiding sleeve 3, and a guiding chamfer 302 is formed at the end of the second circular through hole 301 (feeding guiding function).

Referring to fig. 7, the maximum load current of the electromagnetic coil 4 is 100mA, the power voltage is 20-36V DC, and the maximum load current and the power voltage are output by two groups of PNP levels, namely a normally open function and a normally closed function, wherein the normally open function indicates that the high level output by the core rod is not detected, and the normally closed function indicates that the high level output by the core rod is detected (the core rod is in an abnormal working condition of rupture).

Referring again to fig. 1 to 3, the fastener is composed of 4 sets of hexagon socket head cap screws 5 (screws) and spring washers, which are standard parts; the support base 1 is provided with 6 hexagon socket head cap bolts 5 and spring washers, 4 hexagon socket head cap bolts 5 and spring washers for the column 202 of the bracket 2, 4 hexagon socket head cap bolts 5 and spring washers for the bottom plate 201 of the bracket 2, and 2 hexagon socket head cap bolts 5 and spring washers for the electromagnetic coil 4.

When the core rod breakage detection device is used, the core rod breakage detection device needs to be assembled in advance, namely:

1) assembling the support seat 1: firstly, horizontally placing 2 bottom plates 101 on a welding operation platform, then vertically placing the front vertical plate 102 and the rear vertical plate 103 on two sides of the 2 bottom plates 101 respectively, directionally assembling the guide sleeve 3 in the concentric reducing step holes 106 and the first circular through hole 108 of the front vertical plate 102 and the rear vertical plate 103 (aiming at correcting concentricity), fixing by spot welding, verifying the concentricity, the perpendicularity and the parallelism of the bottom plates 101 and the front vertical plate 102 and the rear vertical plate 103, then firmly welding, and finally cleaning welding slag and burrs;

2) assembling the bracket 2: firstly, horizontally arranging a base plate 201 on a welding operation platform, then vertically arranging 2 upright posts 202 on two sides of the plane of the base plate 101 respectively, then directionally assembling guide sleeves 3 dismantled from a supporting seat 1 in round holes of the 2 upright posts 202 (a first semicircular groove 206 and a second semicircular groove 208 are combined to correct concentricity for purposes), fixing by spot welding, verifying concentricity, perpendicularity and parallelism of the upright posts 202 on the base plate 201, then firmly welding, and finally cleaning welding slag and burrs;

3) assembling the support seat 1 and the support 2: firstly, horizontally placing a welded and formed supporting seat 1 on an operation platform, then vertically placing a bracket 2 on a bottom plate of the supporting seat 1, loosening the front and rear vertical plates 102 and 103 and the hexagon socket head cap screws 5 (screws) of the upright posts 202, directionally assembling a guide sleeve 3 (aiming at correcting concentricity), and then pre-tightening; at this time, after aligning the 4 second threaded through holes 204 on the bottom plate 201 with the 4 first threaded through holes 104 on the bottom plate 101, fastening by using 4 hexagon socket head bolts 5 and locking by using 4 spring washers;

4) the electromagnetic coil 4 is assembled with the guide sleeve 3: firstly, the hexagon socket head cap bolts 5 (screws) of the front and rear vertical plates 102 and 103 and the upright posts 202 are loosened, the guide sleeve 3 is removed, then the electromagnetic coil 4 is directionally installed on the bottom plate 201, the round hole at the bottom of the electromagnetic coil 4 is aligned with the first threaded through hole 104 at the position 2 on the bottom plate 201 and then is pre-tightened, at the moment, the guide sleeve 3 is installed in the concentric reducing step hole 106 and the first circular through hole 108 again, and after the concentricity is corrected, all the hexagon socket head cap bolts 5 (screws) of all the components are fastened.

The assembly of the components of the mandrel bar fracture detection device is completed, the mandrel bar fracture detection device can be used for being put into production and use after being installed on site, and the mandrel bar assembly in the production process of the seamless steel pipe cold-rolled pipe is subjected to online detection operation at all times. As shown in fig. 8, when the mandrel bar breakage detection device 400 of the present invention is used on site, it is installed at a setting station of a front end body 401 (bed) of a rolling mechanism, fixed by a fastening member, and connected to a power line and a signal line, and is used by a production side after debugging. When the electromagnetic coil 4 indicator lamp is normally open during use, the high level output by the core rod is not detected, and the core rod assembly 402 works normally; when the electromagnetic coil 4 indicator lamp is in a normally closed state, the high level output by the core rod is detected, and the core rod assembly 402 has a rupture abnormal working condition and needs to be immediately stopped for disposal.

The core rod breakage detection device provided by the utility model applies an advanced electrical detection technology to the field of seamless steel pipe cold rolling, and has the advantages of low improvement cost, easiness in field implementation and higher cost performance. Reasonable in design, the succinct compactness of structure, the location is reasonable, high durability and convenient use, it is convenient to maintain, magnetic line of force non-contact through annular high magnetic coil surveys often, realize drawing the measuring often of the horizontal direction displacement of stick to the most front end magnetism of plug (top) in rolling, through drawing the discovery of stick horizontal displacement technique and judging plug (top) emergence abnormal operating mode, in time shut down the investigation and deal with, thereby reduce the damage to rolling mechanism and seamless steel pipe, reduce the equipment maintenance of enterprise and deal with the cost, high temperature alloy has been satisfied, the technical requirement of novel steel grade seamless steel pipe cold rolling pipe such as nickel base alloy, the field application is effectual, and is practical high-efficient. The electromagnetic coil with the high magnetic probe is replaced by the mature electromagnetic coil, the annular structure of the electromagnetic coil is convenient and fast to install, the station adjustment is avoided, labor and time are saved, the dependence on high-skill personnel is reduced, and conditions are created for realizing standardized operation. The supporting seat is fixed on the front end lathe bed of the rolling mechanism through threads, the support is fixed in the supporting seat through threads, the mounting stability of the supporting seat, the support and the lathe bed is good, and a stable carrier is provided for precision detection; the guide sleeve passes through the circular holes formed by the supporting seat, the bracket and the electromagnetic coil, so that a reliable station is provided for the precision detection of the annular magnetic force line without a blind area, the positioning is reasonable, the vibration resistance stability is good, the electromagnetic coil faults are reduced, the functional precision construction of equipment is promoted, the field fault elimination and cost reduction effects are obvious, and the economic benefit can be created by more than 50 ten thousand yuan each year. The device has strong universality, and has certain reference and application values for the corresponding improvement of other two-roller periodic seamless steel tube cold rolling mills.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims (9)

1. The utility model provides a plug detection device that breaks for seamless steel pipe cold rolling mill which characterized in that: comprises a supporting seat, a bracket, a guide sleeve and an electromagnetic coil;

the bracket is arranged on the supporting seat;

the guide sleeve penetrates through the supporting seat and the bracket and is arranged on the supporting seat and the bracket;

the electromagnetic coil is sleeved on the guide sleeve and is fixed on the bracket.

2. The mandrel bar breakage detection apparatus for a seamless steel tube cold rolling mill according to claim 1, characterized in that: the supporting seat comprises a bottom plate, a front vertical plate and a rear vertical plate which are respectively welded at two end parts of the bottom plate;

the bottom flat plate is provided with two rectangular plates, and the bottom flat plate is provided with first threaded through holes;

the front vertical plate is arranged in a convex shape, a first threaded hole is formed in a step of the front vertical plate, and a concentric different-diameter step hole is formed in the front vertical plate;

the large-diameter end of the concentric different-diameter step hole is positioned on the outer side of the front vertical plate, and the small-diameter end of the concentric different-diameter step hole is positioned on the inner side of the front vertical plate;

the rear vertical plate is arranged in a convex shape, a second bolt hole is formed in the step of the rear vertical plate, a third bolt hole is formed in the top surface of the rear vertical plate, and a first circular through hole concentric with the concentric step hole with the different diameter is formed in the rear vertical plate.

3. The mandrel bar breakage detection apparatus for a seamless steel tube cold rolling mill according to claim 2, characterized in that: and a rectangular groove is formed in the top surface of the front vertical plate and is communicated with the large-diameter end of the concentric different-diameter step hole.

4. The mandrel bar breakage detection apparatus for a seamless steel tube cold rolling mill according to claim 1, characterized in that: the bracket comprises a bottom plate, upright posts welded on two end parts of the bottom plate and upright post covers arranged on the tops of the upright posts;

the bottom plate is arranged into a rectangular plate, and a second threaded through hole is formed in the rectangular plate;

the top of the upright post is provided with a first semicircular groove and a fourth threaded hole;

and a second semicircular groove matched with the first semicircular groove and a fifth threaded hole matched with the fourth threaded hole are formed in the bottom of the upright post cover.

5. The mandrel bar breakage detection apparatus for a seamless steel tube cold rolling mill according to claim 1, characterized in that: the guide sleeve is provided with a concentric different-diameter step-shaped cylinder, and an axial second circular through hole is formed in the circle center position of the guide sleeve.

6. The mandrel bar breakage detection apparatus for a seamless steel tube cold rolling mill according to claim 5, characterized in that: and a guide chamfer is arranged at the end part of the second round through hole.

7. The mandrel bar breakage detection apparatus for a seamless steel tube cold rolling mill according to claim 1, characterized in that: the load current of the electromagnetic coil is 100mA, and the power voltage is 20-36V DC.

8. The mandrel bar breakage detection apparatus for a seamless steel tube cold rolling mill according to claim 1, characterized in that: the supporting seat and the bracket are both made of Q-235A steel.

9. The mandrel bar breakage detection apparatus for a seamless steel tube cold rolling mill according to claim 1, characterized in that: the guide sleeve is made of red copper.

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