CN115815746A

CN115815746A - Hanging type self-feedback temperature control surfacing equipment and process method

Info

Publication number: CN115815746A
Application number: CN202211550073.9A
Authority: CN
Inventors: 李昌; 刘云鹏; 罗丰华; 孙韩; 韩兴
Original assignee: University of Science and Technology Liaoning USTL
Current assignee: University of Science and Technology Liaoning USTL
Priority date: 2022-12-05
Filing date: 2022-12-05
Publication date: 2023-03-21

Abstract

The invention relates to surfacing equipment and a surfacing process, in particular to hanging type self-feedback temperature control surfacing equipment and a process method. The device comprises a pre-welding preheating and temperature feedback system, a surfacing system, a welding defect detection system, a multi-jaw chuck and a top head; heating wires are uniformly distributed in the pre-welding preheating and temperature feedback system, a thermocouple is configured to test the preheating temperature of the welded workpiece, and the translation speed is controlled by temperature self-feedback to uniformly preheat the welded workpiece; the welding gun head of the surfacing system is fixedly connected with the probe of the welding defect detection system and is arranged in parallel, and the welding gun head is hung above a workpiece to be welded and can move horizontally. The preheating device can accurately preheat the ferrous metallurgy roller products with different sizes before surfacing, is particularly suitable for descaling roller surfacing, can accurately control the temperature before and during welding, and avoids cracking. Meanwhile, welding defects are detected and found in time during welding, micro defects such as microcracks and slag inclusion are effectively reduced, rejection rate is reduced, and welding cost is reduced.

Description

Hanging type self-feedback temperature control surfacing equipment and process method

Technical Field

The invention relates to surfacing equipment and a surfacing process, in particular to hanging type self-feedback temperature control surfacing equipment and a process method.

Background

With the rapid development of modern science and technology, steel materials are widely applied. The failure modes are mainly three: the steel consumption reaches 7 hundred million tons all the year around, and 50 percent of the steel consumption is related to abrasion. According to statistics, the loss of China caused by abrasion reaches 400 hundred million years, and 300 million tons of abrasion-resistant materials are consumed each year.

The surfacing is an important method in the field of surface engineering, can realize that a surfacing layer with the thickness of nearly 30mm resists alternating stress, and has the advantage of higher cost performance. Particularly has wide application prospect in the surface strengthening treatment aspect of roller products such as rough rolling, descaling rolls in finish rolling areas and the like on a steel rolling production line.

And conveying the discharged plate blank to a high-pressure water descaling box through a roller way, and removing the iron scale on the surface of the plate blank by using high-pressure water. Then the plate blank enters a four-roller reversible roughing mill for reciprocating rolling. During rolling, the secondary iron scale can be removed at the inlet or the outlet of the rolling mill by using high-pressure water. After rolling for 3-7 times, rolling into an intermediate strip billet with the thickness of 20-60 mm, and sending the intermediate strip billet into a hot coil box through an intermediate roller way or entering a finishing mill group through hot coils. The intermediate strip blank coiled by the hot coiling box is uncoiled and enters a head cutting flying shear. The strip blank enters a finish rolling descaling box after the head and the tail of the strip blank are cut off by a head cutting flying shear, and regenerated iron scale is removed by high-pressure water. Then the strip steel passes through a vertical rolling mill before a finishing mill F1, the width tolerance of the strip steel is accurately controlled, the edge quality is improved, finally the strip steel is sent into a finishing mill group, and the strip steel passes through the finishing mill group F1-F7 to be rolled into the strip steel with the thickness of 1.2-12.7 mm.

The descaling roller in the descaling box has severe working conditions, bears the action of high-pressure water erosion and the action of dynamic impact caused in the descaling process of high-temperature steel billets for a long time, and is faced with the multi-field strong coupling action of high temperature, strong abrasion and multi-cycle heat, force and flow. Wear and corrosion failure often occur, which affects continuous production operation of steel rolling and needs surface strengthening or repairing treatment. The surface of roller products such as descaling rolls and the like which are in service under severe conditions is strengthened, the wear resistance and corrosion resistance of the roller products are enhanced, and the surfacing welding of the flux-cored wire containing WC hard phases is an important method.

However, in the process of overlaying welding, the flux-cored wire containing the WC hard phase is extremely sensitive to temperature and easy to crack, and accurate temperature control equipment and method need to be designed aiming at the overlaying welding process. Meanwhile, the surfacing process is easy to form micro defects such as slag inclusion, air holes, cracks and the like, and the rejection rate of finished products is high after welding. If the welding micro defects can be found and early warned in time in the welding process, the yield can be greatly improved, and the welding cost is reduced. At present, surfacing equipment and a process method for solving the problems are extremely lacking at home and abroad.

CN 201610647456.6 a build-up welding equipment of restoreing roll, though can realize roll surfacing, improve surface quality, nevertheless lack weld preheating before and welding defect check out test set, on the weldment need preheat the back through the heating furnace and transfer to the welding machine, cause easily to be welded roller surface temperature and run off, increase the temperature gradient between the build-up welding layer, easily produce welding crack. Meanwhile, the welding gun of the welding mechanism has a limited transverse moving range and is not suitable for surfacing operation of over-long roller products.

The application number is CN 201410121067.0 the surfacing equipment only to surfacing, postweld heat treatment and three kinds of technologies of turning combine together to improve the turning performance of postweld roller. However, the method is difficult to apply in actual production, the heat treatment mode adopts a local point heating mode, the surfacing roller is difficult to carry out accurate constant-temperature heat treatment, a large temperature gradient is easy to form, thermal stress is generated, and the cracking phenomenon is easy to cause. Meanwhile, the heating mode is difficult to form effective cooperation with a welding gun, and the temperature control is synchronous. The preheating device has no preheating function before overlaying, is equally important for accurate preheating before welding, and is a main cause of welding cracks. Meanwhile, the welding process defect detection early warning device is lacked in the patent, and the long rod surfacing welding can not be used.

Although the special overlaying device for the foot roller, disclosed in application number CN 201721498357.2, can carry out overlaying on the foot roller with small size, the special overlaying device is lack of universality and cannot carry out overlaying on a long roller. Meanwhile, a welding accurate heat treatment system and a welding defect early warning system are not provided.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a hanging type self-feedback temperature control surfacing welding device and a process method. The roller pre-welding and post-welding accurate preheating and detection and defect early warning in welding can be realized aiming at rollers with different lengths and different diameters, the surfacing quality is improved, the surfacing cost is reduced, and the economic benefit is improved.

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

a suspension type self-feedback temperature control surfacing device comprises a pre-welding preheating and temperature feedback system, a surfacing system, a welding defect detection system, a multi-jaw chuck and a top head; the multi-jaw chuck clamps one end of the welded workpiece, and the top head tightly pushes the other end of the welded workpiece; the pre-welding preheating and temperature feedback system is positioned between the multi-jaw chuck and the top head and can translate, a semi-open-close type structure is adopted, heating wires are uniformly distributed in the semi-open-close type structure, a thermocouple is configured to test the preheating temperature of the workpiece to be welded, and the workpiece to be welded is uniformly preheated by controlling the translation speed through temperature self-feedback; the welding gun head of the surfacing system and the probe of the welding defect detection system are fixedly connected and arranged in parallel, hung above a welded workpiece and capable of translating, and after the welded workpiece is uniformly preheated, welding internal defects are detected while surfacing to display the internal state of a surfacing layer by images.

Further, the pre-welding preheating and temperature feedback system comprises a thermocouple, a temperature display instrument, a preheating system upper barrel cover, a preheating system lower barrel cover, refractory bricks, an electric heating wire and asbestos; the upper barrel cover and the lower barrel cover of the preheating system are transversely arranged and hinged through a rotating shaft, can be opened and closed up and down, and form a barrel body after being closed, and annular asbestos cloth is arranged at two ends of the barrel body to flexibly block the inner cavity of the barrel body; a plurality of thermocouples are uniformly distributed on the barrel body at intervals, and the average value of the preheating temperature is displayed by a display screen; refractory bricks are embedded in the inner walls of the upper barrel cover and the lower barrel cover of the preheating system, and electric heating wires are arranged in the refractory brick separation grooves.

And a water cooling circulation pipeline is arranged between the upper barrel cover of the preheating system, the inner wall of the lower barrel cover of the preheating system and the refractory bricks, is connected with the water tank, supplies water through the water tank and the circulating pump, and cools the upper barrel cover of the preheating system and the lower barrel cover of the preheating system.

Further, the device also comprises a preheating system walking guide rail, a preheating system walking motor and a preheating system walking lead screw; the lower barrel cover of the preheating system is fixedly connected with a walking screw of the preheating system, the lower barrel cover of the preheating system is supported above the walking guide rail and slides along the walking guide rail, the walking screw of the preheating system is meshed with a walking screw of the preheating system, and a walking motor of the preheating system drives the walking screw of the preheating system to rotate so as to push the walking screw of the preheating system to move back and forth, so that the preheating system moves forward along the axial direction of a welded roller body.

The welding machine vertical support comprises two portal frames which are parallel to each other, and two ends of the middle cross beam are fixedly connected to the tops of the two portal frames respectively; the surfacing system is hung on the middle cross beam through a slide way, the middle cross beam is provided with a lead screw in parallel, and the lead screw is driven by a motor to rotate so as to realize the transverse movement of the surfacing system; four supporting feet of the two portal frames are respectively provided with walking wheels, and the walking motors drive the walking frames to transversely walk.

Further, the surfacing system comprises a welding gun walking mechanism, a welding gun vertical adjusting mechanism and a vertical adjusting mechanism; the welding gun walking mechanism, the welding gun vertical adjusting mechanism and the vertical adjusting mechanism respectively drive the screw rods to rotate through the servo motors, and the three screw rods are vertically arranged in pairs in space, so that the axial, vertical and vertical adjustment of the position of the welding gun head is realized.

Further, the device also comprises a wire feeding mechanism, a flux hopper and a waste material groove; the wire feeding mechanism consists of a wire feeding driving motor and four wire feeding rollers, the wire feeding rollers are arranged in an upper row and a lower row, and the wire feeding rollers are used for holding welding wires pairwise so as to drive the welding wires to feed the welding gun head through rolling friction.

The welding flux hopper is connected with the welding gun head through a welding flux conveying hose to realize submerged arc welding flux distribution; the waste material groove is located on the ground right below the welding gun head and used for collecting residual welding flux falling in the welding process.

Furthermore, the multi-jaw chuck adopts a three-jaw chuck, and a probe of the welding defect detection system adopts a phased array scanning probe.

A suspension type self-feedback temperature control surfacing process mainly aims at surfacing of descaling roll roller workpieces in the field of ferrous metallurgy, particularly aims at surfacing of WC flux-cored wires of descaling rolls, wherein WC hard phases can enhance wear resistance, erosion resistance and dynamic impact resistance, but are sensitive to surfacing preheating temperature and easy to crack;

the method specifically comprises the following steps:

1) Preheating a descaling roller to a required temperature by using a preheating system before welding, wherein the preheating system realizes movement according to temperature self-feedback, and a welding gun head of a surfacing system and a probe of a welding defect detection system which are arranged in parallel follow the preheating system;

2) Performing process detection while surfacing, and immediately alarming if internal defects of surfacing are found to ensure the surfacing quality;

3) After overlaying, the preheating system is used for heat treatment at 500-650 ℃, the descaling roller is annealed, the temperature is kept and the descaling roller is cooled along with the furnace, the structure after welding is improved, the welding stress is eliminated, and the defects after welding are reduced.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention is provided with a pre-welding preheating and temperature feedback system, which can apply accurate preheating to the surface of a welded roller before surfacing, and the temperature feedback system can uniformly control the preheating temperature of a workpiece according to requirements; the welding gun head of the surfacing system and the probe of the welding defect detection system are synchronously and closely surfaced, so that the preheating temperature loss of the roller body can be reduced to the maximum extent, and the welding quality is ensured.

2. The accurate temperature control system before, during and after welding is unified with the welding defect detection system, so that the working performance and the application range of the surfacing machine are effectively improved. The method is particularly suitable for scale removing roller surfacing WC flux-cored wire submerged arc surfacing long roller products and easy-cracking weld beads. Through the design of an opening-closing type structure preheating system, the accurate temperature control of the welding roller is realized by combining the temperature self-feedback function. The welding defect detection system realizes instantaneous detection and synchronous early warning on a welding channel, effectively avoids welding waste products and solves the industry bottleneck.

3. The welding defect detection system is arranged, flaw detection can be carried out on a welding line in the welding process, and early warning treatment is carried out immediately when micro-defects of internal welding are found, so that the rejection rate is effectively reduced.

4. The invention can be suitable for surfacing welding of rollers with different diameters and lengths, precise preheating of the rollers before welding and dynamic detection and early warning of microscopic defects in the welding process, and effectively fills the industrial blank.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a front view of the present invention in a schematic configuration;

FIG. 3 is an enlarged view taken at I of FIG. 1;

FIG. 4 is an enlarged view taken at point II of FIG. 1;

FIG. 5 is an enlarged view of a portion of the welding system of the present invention;

FIG. 6 is a schematic perspective view of another embodiment of the present invention;

FIG. 7 is a perspective view of a wire feeder of the welding system of the present invention;

FIG. 8 is a schematic view of another perspective view of a wire feeder of the welding system of the present invention;

FIG. 9 is a schematic perspective view of a pre-weld preheating and temperature feedback system according to the present invention;

FIG. 10 is an enlarged view of a portion of the pre-weld preheating and temperature feedback system of the present invention;

FIG. 11 is a structural view of a circulating water tank of a lower barrel cover of the preheating system of the present invention;

FIG. 12 is an assembly view of refractory bricks and heating wires of the present invention;

FIG. 13 is a schematic view of the structure of the lower barrel cover of the preheating system of the present invention;

FIG. 14 is an assembled view of the interior of the lower drum lid of the preheating system of the present invention;

FIG. 15 is an assembly view of the upper drum cover and refractory bricks of the preheating system of the present invention;

FIG. 16 is a cross-sectional view of the upper drum lid of the preheating system of the present invention;

FIG. 17 is a schematic view of an asbestos stopper of the present invention;

FIG. 18 is a view showing the construction of an asbestos briquette of the present invention;

FIG. 19 is a PLC ladder diagram of the welding system of the present invention.

In the figure: 1-electric control cabinet, 2-welding roller rotary driving motor, 3-gear reduction box, 4-roller clamping three-jaw chuck, 5-welding flux hopper, 6-welding gun walking screw, 7-pre-welding preheating and temperature feedback system, 8-welding gun walking motor, 9-movable tailstock ejector, 10-ejector base, 11-preheating system walking guide rail, 12-preheating system walking motor, 13-welded part supporting platform, 14-welding machine vertical support walking guide rail, 15-circulating water tank, 16-waste material tank, 17-welding machine vertical support, 18-welding machine vertical support walking motor, 19-welding machine vertical support anchor roller, 20-welding gun vertical adjusting motor, 21-welding gun head, 3-gear reduction box, 4-roller clamping three-jaw chuck, 5-welding flux hopper, 6-welding gun walking screw, 7-pre-welding preheating and temperature feedback system, 8-welding machine walking guide rail, 15-circulating water tank, 16-waste material tank, 17-welding machine vertical support, 18-welding machine vertical support walking motor, 19-welding machine vertical support anchor roller, 20-welding gun vertical adjusting motor, 21-welding gun head, welding machine vertical adjusting motor, welding machine and welding machine 22-welded roller, 23-protective baffle, 24-phased array scanning probe, 25-welding gun vertical adjusting motor, 26-welding gun vertical adjusting screw rod, 27-wire feeding driving motor, 28-wire feeding inlet, 29-welding gun vertical adjusting screw rod, 30-welding flux conveying hose, 31-wire feeding roller, 32-preheating system walking screw rod, 33-water inlet pipe, 34-water outlet pipe, 35-preheating system upper barrel cover, 36-preheating system lower barrel cover, 37-thermocouple, 38-temperature display instrument, 39-refractory brick, 40-heating wire, 41-asbestos press block, 42-asbestos plug, 43-preheating system circulating water inlet, 44-preheating system circulating water outlet, 45-water circulating channel

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

[ examples ] A method for producing a compound

As shown in fig. 1 to 6, a suspension type self-feedback temperature control surfacing welding device comprises a pre-welding preheating and temperature feedback system, a surfacing welding system, a welding defect detection system, a roller clamping three-jaw chuck 4, a movable tailstock top 9, an electric control cabinet 1 and a main body frame. The welded part supporting platform 13, the welding machine vertical support walking guide rail 14 and the welding machine vertical support 17 are main body frames for supporting the whole welding device.

Roller centre gripping three-jaw chuck 4 rigid coupling is in by weldment supporting platform 13, welding roller rotary driving motor 2 and gear reduction box 3 cooperate mutually and provide rotation power for roller centre gripping three-jaw chuck 4, the left end of roller 22 is welded in the centre gripping of roller centre gripping three-jaw chuck 4, top base 10 parallel is arranged in by weldment supporting platform 13, movable tailstock top 9 rigid coupling is on top base 10 for the right-hand member of roller 22 is welded in the tight top of movable tailstock top 9 top makes its axial fixity.

The pre-welding preheating and temperature feedback system 7 is used for accurately preheating the welded roller 22, the preheating system walking motor 12 is triggered after the preset temperature is reached, the preheating system walking screw 32 is driven to rotate, the preheating and temperature feedback system 7 moves axially along the preheating system walking guide rail 11, another self-feedback response is triggered, and accurate preheating of the welded roller 22 is guaranteed.

The vertical support 17 of the welding machine comprises two portal frames which are parallel to each other, and two ends of the middle cross beam are respectively and fixedly connected to the tops of the two portal frames. The welding gun walking motor 8 and the welding gun walking screw 6 are arranged on the middle cross beam, the welding gun walking screw nut is meshed with the welding gun walking screw 6, and the welding flux hopper 5 is fixedly connected to the welding gun walking screw nut. The welding gun vertical adjusting screw rod 26 is installed on a welding gun walking screw nut, the welding gun vertical adjusting motor 25 is connected with the welding gun vertical adjusting screw rod 26 and drives the welding gun vertical adjusting screw rod to rotate, the welding gun vertical adjusting screw rod is meshed with the welding gun vertical adjusting screw rod 26, the welding gun vertical adjusting screw rod 29 is installed on the welding gun vertical adjusting screw nut, the welding gun vertical adjusting motor 20 is connected with the welding gun vertical adjusting motor and drives the welding gun vertical adjusting screw rod to rotate, the welding gun vertical adjusting screw nut is meshed with the welding gun vertical adjusting screw rod 29, the welding gun head 21 is fixedly connected to the welding gun vertical adjusting screw nut, and the phased array scanning probe 24 is fixedly connected to the welding gun head 21.

The welding gun walking motor 8 provides rotation power for the welding gun walking screw 6, and the axial transverse movement of the welding gun head 21 and the phased array scanning probe 24 is realized.

The bottom parts of four supporting legs of the welding machine vertical support 17 are provided with welding machine vertical support ground rollers 19, and the welding machine vertical support ground rollers 19 can slide on the welding machine vertical support walking guide rail 14 under the driving of a welding machine vertical support walking motor 18 so as to adapt to the surfacing operation of rollers with different lengths.

The protective baffle 23 is fixedly connected to the front end of the lower barrel cover 36 of the preheating system, so that any splashing of welding flux during welding can be prevented, the surfaces of the parts such as the welded part supporting platform 13, the preheating system walking guide rail 11, the welding machine vertical support walking guide rail 14 and the preheating system walking screw 32 are protected to be clean, the welding flux blocked by the protective baffle 23 can slide into the waste trough 16 along with the arc-shaped baffle, and the recovery of the welding flux is completed.

As shown in fig. 1, 2, 3, 6, 7 and 8, the welding gun vertical adjustment motor 20 and the welding gun vertical adjustment motor 25 respectively provide rotation power for the welding gun vertical adjustment screw 29 and the welding gun vertical adjustment screw 26, drive the welding gun head 21 and the phased array scanning probe 24 to perform mobile welding according to the size requirement of the roller 22 to be welded, and can detect the welding defects of the roller 22 to be welded in real time during the build-up welding.

The flux is poured into the flux hopper 5, transported to the side of the gun head 21 via the flux delivery hose 30, and finally delivered from the gun head 21 to the surface of the roller 22 to be welded. The welding wire is fed from the wire feeding inlet 28, and the wire feeding driving motor 27 provides the rotating power for the wire feeding roller 31, so that the welding wire is extruded through the wire feeding roller 31 and is conveyed to the surface of the welded roller 22 through the welding gun head 21, and the surfacing work is completed.

As shown in fig. 9 to 18, the pre-welding preheating and temperature self-feedback system 7 includes a preheating system upper barrel cover 35, a preheating system lower barrel cover 36, a temperature display instrument 38, refractory bricks 39, an electric heating wire 40, asbestos briquettes 41, and an asbestos plug 42. The upper and lower barrel covers of the preheating system adopt an open-close type design to realize encircling heating on the welded rollers 22. The refractory bricks 39 and the heating wires 40 are arranged on the inner wall surfaces of the upper barrel cover and the lower barrel cover of the preheating system, so that the welded rollers 22 are uniformly heated, and the temperature gradient is reduced. The asbestos pressing block 41 and the asbestos plug 42 can effectively prevent the temperature from losing, so that the preheating and temperature self-feedback system 7 has the heat preservation function. The upper barrel cover and the lower barrel cover of the preheating system are provided with a preheating system circulating water inlet 43 and a preheating system circulating water outlet 44, water circulating channels 45 are arranged inside the upper barrel cover metal shell and the lower barrel cover metal shell of the preheating system, water in the circulating water tank 15 is extracted by a water pump, is conveyed into the water circulating channels 45 of the upper barrel cover and the lower barrel cover of the preheating system through the preheating system circulating water inlet 43 through a water inlet pipe 33 and flows back to the water tank through a water outlet pipe 34, cooling of the upper barrel cover metal shell and the lower barrel cover metal shell of the preheating system is achieved, and it is guaranteed that the upper barrel cover and the lower barrel cover of the preheating system cannot be damaged due to high temperature. The preheating system lower cover 36 is fixedly connected to the preheating system walking screw, the preheating system walking screw is in sliding connection with the preheating system walking guide rail 11, the preheating system walking screw is meshed with the preheating system walking screw 32, and the preheating system walking motor 12 drives the preheating system walking screw 32 to rotate so as to push the preheating system walking screw to move back and forth.

A suspension type self-feedback temperature control surfacing welding process method comprises the following process principles and process steps:

1. firstly, a welding machine vertical support walking motor 18 is started to drive a welding machine vertical support ground roller 19 to enable a welding machine vertical support 17 to move along a welding machine vertical support walking guide rail 14. When the surfacing system hung on the vertical support 17 of the welding machine moves to the initial welding position, the upper barrel cover 35 of the preheating system is opened, the welded roller 22 is hoisted between the roller clamping three-jaw chuck 4 and the movable tailstock 9, the roller clamping three-jaw chuck 4 clamps the left end of the welded roller 22, and the top base 10 supports the movable tailstock top 9 to tightly push the right end of the welded roller 22. And closing the upper barrel cover 35 of the preheating system, sealing the gap between the pre-welding preheating and temperature self-feedback system 7 and the welded roller 22 through asbestos plugs 42 at two ends of the preheating system, and completing the clamping.

2. As shown in fig. 19, the preheating system walking motor 12 is started to drive the preheating system walking screw 32 to rotate, so as to drive the pre-welding preheating and temperature self-feedback system 7 to move to the leftmost end of the welded roller 22, and the left end surface of the welded roller 22 coincides with the left end surface of the pre-welding preheating and temperature self-feedback system 7.

3. The preheating system walking motor 12 stops working, and meanwhile, the pre-welding preheating and temperature self-feedback device 7 starts preheating and heating the welded roller 22. The preheating temperature is accurately displayed on a temperature display instrument 38 through a thermocouple 37, after the expected temperature is reached, the preheating system walking motor 12 is started through temperature self-feedback, and the preheating and temperature self-feedback system 7 before welding starts to move rightwards along the preheating system walking track 11 at a certain speed.

4. Meanwhile, the welding gun walking motor 8, the welding gun vertical adjusting motor 20 and the welding gun vertical adjusting motor 25 are started to drive the welding gun head 21 and the phased array scanning probe 24 to move along with the pre-welding preheating and temperature self-feedback system 7, and submerged arc surfacing is synchronously realized.

5. After surfacing starts, the welding rotating motor 2 drives the roller holding three-jaw chuck 4 to drive the welded roller 22 to rotate through the gear reduction box 3. The wire feed drive motor 27 drives the wire feed roller 31, and the welding wire enters from the wire feed inlet 28 and is fed by the wire feed roller 31 to the torch head 21 to the surface of the roller 22 to be welded. The flux is delivered from the hopper 5 to the welding gun head 21 through the flux delivery hose 30, reaches the surface of the roller 22 to be welded, and covers and buries the contact point between the welding wire and the roller body.

6. The roller 22 to be welded is preheated before welding and accurately preheated by the temperature feedback system 7, then surfacing is started, the phased array scanning probe 24 and the welding gun head 21 synchronously travel to detect the formed welding bead in real time, the welding microdefect is found, an alarm is immediately given, and repair welding is stopped in time. If no abnormity exists, the unprocessed part of the welded roller 22 is continuously preheated, and the vertical bracket walking motor 18 of the welding machine is started at any time according to the length of the welded roller 22 so as to adapt to the requirements of different roller lengths.

7. In the surfacing process, circulating water flows into the water circulating channel 45 from the circulating water inlet 43 of the preheating system through the water inlet pipe 33 and flows back to the circulating water tank 15 from the circulating water outlet 44 of the preheating system through the water outlet pipe 34, so that the overhigh temperature is prevented.

The invention combines the pre-welding preheating and the post-welding dynamic early warning detection, synchronizes the preheating and the surfacing welding process, effectively reduces the interlayer temperature gradient in the surfacing welding process and reduces the micro defects in the welding process. The working range of the welding machine is effectively increased through the optimized design.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a suspension type self feedback temperature control surfacing equipment which characterized in that: the device comprises a pre-welding preheating and temperature feedback system, a surfacing system, a welding defect detection system, a multi-jaw chuck and a top head; the multi-jaw chuck clamps one end of the welded workpiece, and the top head tightly pushes the other end of the welded workpiece; the pre-welding preheating and temperature feedback system is positioned between the multi-jaw chuck and the top head and can translate, a semi-open-close type structure is adopted, heating wires are uniformly distributed in the semi-open-close type structure, a thermocouple is configured to test the preheating temperature of the workpiece to be welded, and the workpiece to be welded is uniformly preheated by controlling the translation speed through temperature self-feedback; the welding gun head of the surfacing system and the probe of the welding defect detection system are fixedly connected and arranged in parallel, hung above a welded workpiece and capable of translating, and after the welded workpiece is uniformly preheated, welding internal defects are detected while surfacing to display the internal state of a surfacing layer by images.

2. The hanging type self-feedback temperature control surfacing equipment according to claim 1, characterized in that: the pre-welding preheating and temperature feedback system comprises a thermocouple, a temperature display instrument, a preheating system upper barrel cover, a preheating system lower barrel cover, refractory bricks, an electric heating wire and asbestos; the upper barrel cover and the lower barrel cover of the preheating system are transversely arranged and hinged through a rotating shaft, can be opened and closed up and down, and form a barrel body after being closed, and annular asbestos cloth is arranged at two ends of the barrel body to flexibly block the inner cavity of the barrel body; a plurality of thermocouples are uniformly distributed on the barrel body at intervals, and the average value of the preheating temperature is displayed by a display screen; refractory bricks are embedded in the inner walls of the upper barrel cover and the lower barrel cover of the preheating system, and electric heating wires are arranged in the refractory brick separation grooves.

3. The hanging type self-feedback temperature control surfacing equipment according to claim 2, characterized in that: the preheating system is characterized by further comprising a water cooling system, a water cooling circulation pipeline is arranged between the upper barrel cover of the preheating system, the inner wall of the lower barrel cover of the preheating system and the refractory bricks, the water cooling circulation pipeline is connected with the water tank, water is supplied through the water tank and the circulating pump, and the upper barrel cover of the preheating system and the lower barrel cover of the preheating system are cooled.

4. The hanging type self-feedback temperature control surfacing equipment according to claim 1, characterized in that: the device also comprises a preheating system walking guide rail, a preheating system walking motor and a preheating system walking lead screw; the lower barrel cover of the preheating system is fixedly connected with a walking screw of the preheating system, the lower barrel cover of the preheating system is supported above the walking guide rail and slides along the walking guide rail, the walking screw of the preheating system is meshed with a walking screw of the preheating system, and a walking motor of the preheating system drives the walking screw of the preheating system to rotate so as to push the walking screw of the preheating system to move back and forth, so that the preheating system moves forward along the axial direction of a welded roller body.

5. The hanging type self-feedback temperature control surfacing equipment according to claim 1, characterized in that: the welding machine vertical support comprises two portal frames which are parallel to each other, and two ends of the middle cross beam are fixedly connected to the tops of the two portal frames respectively; the surfacing system is hung on the middle cross beam through a slide way, the middle cross beam is provided with a lead screw in parallel, and the lead screw is driven by a motor to rotate so as to realize the transverse movement of the surfacing system; four supporting feet of the two portal frames are respectively provided with walking wheels, and the walking motors drive the walking frames to transversely walk.

6. The suspended self-feedback temperature control surfacing equipment according to claim 1, characterized in that: the surfacing system comprises a welding gun walking mechanism, a welding gun vertical adjusting mechanism and a vertical adjusting mechanism; the welding gun walking mechanism, the welding gun vertical adjusting mechanism and the vertical adjusting mechanism respectively drive the screw rods to rotate through the servo motors, and the three screw rods are vertically arranged in pairs in space, so that the axial, vertical and vertical adjustment of the position of the welding gun head is realized.

7. The hanging type self-feedback temperature control surfacing equipment according to claim 6, characterized in that: the welding wire feeding device also comprises a wire feeding mechanism, a welding flux hopper and a waste material groove; the wire feeding mechanism consists of a wire feeding driving motor and four wire feeding rollers, the wire feeding rollers are arranged in an upper row and a lower row, and the wire feeding rollers are used for holding welding wires pairwise and driving the welding wires to feed the welding gun head through rolling friction;

8. The hanging type self-feedback temperature control surfacing equipment according to claim 1, characterized in that: the multi-jaw chuck adopts a three-jaw chuck, and a probe of the welding defect detection system adopts a phased array scanning probe.

9. A process of hanging type self-feedback temperature control surfacing equipment based on claim 1 is characterized in that the process mainly aims at surfacing of descaling roll roller workpieces in the field of ferrous metallurgy, especially aims at submerged arc surfacing of a WC flux-cored wire of a descaling roll, a WC hard phase can enhance wear resistance, erosion resistance and dynamic impact resistance, but is sensitive to surfacing preheating temperature and easy to crack, and the invention mainly designs a pre-welding preheating and temperature self-feedback system aiming at the processes, and specifically comprises the following steps: