CN210586373U

CN210586373U - Uniform heating and heat preservation device for magnesium rod before cross piercing process

Info

Publication number: CN210586373U
Application number: CN201822220711.6U
Authority: CN
Inventors: 邹景锋; 马立峰; 朱艳春; 刘光明; 黄志权; 林金保
Original assignee: Taiyuan University of Science and Technology
Current assignee: Taiyuan University of Science and Technology
Priority date: 2018-12-27
Filing date: 2018-12-27
Publication date: 2020-05-22
Anticipated expiration: 2028-12-27

Abstract

The utility model provides a uniform heating and heat preservation device for a magnesium rod before a cross rolling perforation process, wherein a liner tube is welded with a centering liner plate, heat insulation end plates are arranged at the left and right ends of the liner tube, and a sliding fit mode is adopted between the heat insulation end plates and the centering liner plate; heat-resisting guide rails are riveted on the left side and the right side of the furnace body, and the liner tube can roll on the heat-resisting guide rails; the resistance wire is arranged on the inner wall of the furnace body; the front side and the rear side of the furnace body are provided with furnace door guide rails which are arranged at the positions of the front furnace door outlet and the rear furnace door outlet close to the outer wall of the furnace body and ensure the vertical sliding of the furnace door through the furnace door guide rails; the furnace body is integrally arranged on the furnace frame; the automatic check blocking device is arranged on the upper side of the furnace body close to the outlet. The utility model greatly improves the temperature uniformity when the whole bar is discharged, overcomes the defect of eccentricity in the perforation process, and obviously improves the yield of the pipe; the setting of automatic check device has saved the process of artifical unloading, and the heat that has reduced when opening and close the furnace gate runs off, has promoted the efficiency and the security of production.

Description

Uniform heating and heat preservation device for magnesium rod before cross piercing process

Technical Field

The utility model belongs to magnesium alloy bar heating field, concretely relates to special multi-functional heating device who is used for before magnesium alloy pipe material cross rolling perforation technology, collects magnesium alloy bar's even heating function and the heat preservation function in an organic whole after the rod goes out the stove.

Background

As an advanced and efficient magnesium alloy seamless tube production process, the cross-piercing process has extremely strict requirements on the uniformity of the initial rolling temperature and the bar blank temperature in the process of piercing and rolling the magnesium alloy seamless tube. At present, heating furnaces used in the processing process are mostly high-temperature electric furnaces, the temperature measurement mode of thermocouples is adopted, the problem that the technical requirements of the cross rolling perforation process are difficult to meet is generally existed, and the specific contents are as follows:

firstly, in the piercing-rolling process, the initial rolling temperature of the magnesium alloy bar is required to be between 400 ℃ and 520 ℃, and in the operation process, the temperature of a resistance wire is about 50 ℃ to 100 ℃ higher than the tapping temperature of the bar when heating is needed, and the temperature is close to the burning point 600 ℃ to 630 ℃ of the magnesium alloy; the distance between the surface of the bar and the resistance wire is not controlled in the traditional heating mode, the process temperature range is located in an interval with low temperature control precision of the traditional industrial furnace, the temperature rush phenomenon is obvious in the heating process, the temperature fluctuation is large, the combustion of the magnesium bar is easily caused, and the potential safety hazard is generated; meanwhile, the existing heating mode has the phenomenon of uneven temperature when the bar is heated.

Secondly, magnesium alloys dissipate heat very quickly, especially when in contact with metallic rigid bodies. In the cross piercing process, the allowable process temperature range is extremely narrow; the conventional conveying mode causes the temperature of the magnesium alloy bar after being discharged from the furnace and before the punching machine to be lower than the required process temperature range; the bar material is blocked when being pierced and rolled; meanwhile, when the magnesium alloy is used as a thermal stress sensitive material, the difference value of the deformation resistance is large at different temperatures, so that the hot eccentricity phenomenon is easily caused in the piercing-rolling process of the magnesium alloy bar, and the yield of the product is seriously restricted.

In addition, if the heating furnace is integrally modified, the temperature control precision of the heating furnace at medium and low temperature is improved, the modification cost of the existing equipment is high, and the use requirement of large-scale industrial production is difficult to meet.

SUMMERY OF THE UTILITY MODEL

In view of the above situation, an object of the utility model is to provide an even heating and heat preservation device for magnesium stick before the cross rolling perforation technology, it can effectively guarantee accurate, the safe high efficiency of accuse temperature of heating process before the magnesium alloy cross rolling perforation technology to and the heat preservation performance of coming out of the stove.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a be used for magnesium stick even heating and heat preservation device before oblique piercing process, includes: the furnace comprises a liner tube, a centering liner plate, a heat insulation end plate, an upper heat-resistant guide rail, a lower heat-resistant guide rail, a resistance wire, a furnace body, a furnace door guide rail, a furnace frame and an automatic blocking device; wherein 6 groups of centering lining plates are uniformly distributed on the inner wall of the liner tube in the circumferential direction, the liner tube and the centering lining plates are connected in a welding mode, and when a magnesium rod is placed in the liner tube, the centering lining plates automatically center the liner tube; the left end and the right end of the liner tube are provided with heat insulation end plates, notches on the heat insulation end plates are in sliding fit with the centering liner plate to ensure the centering property of the heat insulation end plates, a certain gap is reserved between the heat insulation end plates and the inner wall of the liner tube, and the heat insulation end plates and the centering liner plate are in sliding fit; heat-resisting guide rails are riveted on the left side and the right side of the furnace body, and the liner tube can roll on the heat-resisting guide rails; the heating band composed of resistance wires comprises four groups: the upper heating belt, the lower heating belt, the left heating belt and the right heating belt are respectively arranged on the inner walls of the upper side, the lower side, the left side and the right side of the furnace body, and the distance between the resistance wires and the left end, the right end and the outer surface of the liner tube is 50-80 mm; the front side and the rear side of the furnace body are provided with furnace door guide rails which are arranged at the positions of the front furnace door outlet and the rear furnace door outlet close to the outer wall of the furnace body and ensure the vertical sliding of the furnace door through the furnace door guide rails; the furnace body is integrally arranged on the furnace frame; the automatic check blocking device is arranged on the upper side of the furnace body close to the outlet.

The heat-resistant guide rail is provided with a shaft shoulder in the axial direction of the liner tube, so that the liner tube is limited to rotate by taking the radius as the shaft, and the liner tube can only do translation in the length direction of the heat-resistant guide rail.

The shape of centering welt is isosceles trapezoid, six group's baffle that the circumference was evenly distributed form the centering cavity of horn mouth form at the entrance and exit of bushing pipe.

Automatic check keep off device installs on the furnace body upper surface, it includes: the device comprises a left support, a right support, a servo motor, a sliding guide rail platform, a left sliding rack, a right sliding rack, a gear shaft, a steel wire rope group, a steel wire hook and a stop block; wherein, the servo motor is fixed on a left support positioned on the upper surface of the furnace body and drives the gear shaft to rotate; the left end and the right end of the gear shaft are matched through shaft holes and are sleeved on the shaft holes of the left support and the right support; the gear shaft is provided with a gear, and the gear shaft and the gear are connected through a key; the front and back sides of the gear are provided with left and right sliding racks, the gear rotates to drive the sliding racks to move up and down, and the displacements in other directions of the sliding racks are limited by the sliding guide rail platform fixed on the upper surface of the furnace body in a sliding way. The left sliding rack and the right sliding rack are respectively provided with a steel wire hook and a stop block; when gear revolve drove left slip rack upward movement, the steel wire couple passes through wire rope group pulling furnace gate and opens, and meanwhile, the rotation of gear also drove right slip rack downward movement, and the dog keeps off the function with the surface contact of bushing pipe, realizes keeping off the check of bushing pipe, avoids many bars of landing once, influences the production rhythm.

Preferably, the furnace body is arranged in an inclined manner relative to the ground, the inclination angle being between about 10 ° and 15 °.

Preferably, electric opening devices are arranged on the furnace doors of the outlet and the inlet, and the electric opening devices are provided with three stations of simultaneous opening and closing of two ends, left opening and right closing and right opening and left closing.

In addition, according to the technical scheme provided by the application, the liner tube and the heat insulation end plate are provided with a thermal state recovery-recycling-secondary charging device, recycling between the liner tube and the heat insulation end plate can be realized, and meanwhile, a preheating and heat insulation device for the liner tube and the heat insulation end plate can be additionally arranged in the circulating process of the liner tube and the heat insulation end plate.

The utility model has the advantages that: the magnesium rod is sleeved in the liner tube, and the left end and the right end of the liner tube are provided with heat insulation end plates; in the bar heating process, the direct heat radiation of the resistance wire is isolated by the liner tube and the heat insulation end plate, a circumferential uniform heating cavity is rapidly formed by utilizing the characteristic of excellent heat conductivity of metal, after the liner tube and the heat insulation end are soaked, heat is indirectly transferred to the magnesium bar, the generation of a local overheating phenomenon in the heating process of directly heating the magnesium bar by the resistance wire is avoided, so that the integral allowable heating temperature of the bar is improved, and the discharge temperature of the magnesium bar at 550 ℃ can be realized; in the process of discharging the bar, the steel materials of the lining and the heat insulation end plate play the role of a heat insulation cover in the air; meanwhile, the use of the bushing and the heat insulation end plate avoids the direct contact between the magnesium rod and a guide rail (metal rigid body) of the perforating machine, and plays a good role in heat insulation; when the whole consisting of the bushing, the heat insulation end plate and the magnesium rod is conveyed to the front of the perforating machine, the feeding push rod on the perforating machine pushes the rear heat insulation end plate to drive the magnesium rod and the front heat insulation end plate to move forwards (at the moment, the liner pipe is stopped in the original position by the guide ring on the perforating machine), the heat insulation end plate at the front end slides out of the liner pipe and falls into the recovery device under the action of gravity, the magnesium rod and the rear heat insulation end plate continue to move forwards to complete the feeding process of the magnesium rod, the whole process is completed without interruption, the feeding time of the magnesium rod is greatly shortened, and the heat dissipation capacity is further controlled.

Drawings

FIG. 1 is a general assembly diagram of a uniform heating and heat-insulating device for magnesium alloy bars;

FIG. 2 is a schematic view of an oven cavity apparatus;

FIG. 3 is a schematic diagram of the arrangement of resistance wires in the furnace body;

FIG. 4 is a schematic view of an insulation unit;

FIG. 5 is a schematic cross-sectional view of an insulation assembly;

FIG. 6 illustrates a first automatic catch device component;

FIG. 7 automatic catch device part two;

FIG. 8 is a schematic diagram of a blocking station of the automatic blocking device;

in the figure: 1. a furnace body; 2. a furnace door guide rail; 3. a furnace frame; 4. a furnace door; 5. a wire rope set; 6. lifting lugs; 7. a resistance wire; 8. a liner tube; 9 centering the lining board; 10. a heat insulating end plate; 11. A magnesium rod; 12. a heat-resistant guide rail; 13. a servo motor; 14. a left sliding rack; 15. a right sliding rack; 16. a steel wire hook; 17. a sliding guide rail platform; 18. a gear; 19. a gear shaft; 20. and a stop block.

Detailed Description

The following will combine the drawings of the present invention to clearly and completely describe the technical solution in the present invention, based on the solution in the present invention, all other solutions obtained by the ordinary skilled person in the art without creative work all belong to the protection scope of the present invention.

The utility model discloses the utility model is explained in the following with the accompanying drawings, as shown in fig. 1-8, the utility model provides a special multi-functional heating device that is used for before magnesium alloy tubular product cross rolling perforation technology, collects magnesium alloy rod's even heating function and the heat preservation function in an organic whole after the rod goes out of the stove, it mainly includes, furnace body 1, furnace gate guide rail 2, furnace frame 3, furnace gate 4, wire rope group 5, lug 6, resistance wire 7, bushing pipe 8, centering welt 9, thermal-insulated end plate 10, magnesium stick 11, heat-resisting guide rail 12 and automatic check device. The automatic blocking device comprises a servo motor 13, a left sliding rack 14, a right sliding rack 15, a steel wire hook 16, a sliding guide rail platform 17, a gear 18, a gear shaft 19, a stop block 20, a left support 21 and a right support 22.

As shown in fig. 1, a furnace body 1 is arranged on a furnace frame 3, a furnace door guide rail 2 is arranged at an entrance and an exit of the furnace body 1, and the furnace door guide rail 2 and the furnace body 1 are fixed by screws; the rail groove of the furnace door guide rail 2 is in sliding fit with the furnace door 4, the furnace door 4 is provided with a lifting lug, and the lifting lug is connected in series with an automatic check device arranged on the upper side of the furnace body 1 through a steel wire rope group 5.

As shown in figures 2 and 3, resistance wires 7 are arranged around the inner cavity of the furnace body 1, heat-resistant guide rails 12 are arranged on the left side and the right side, and the lining pipes 8 can slide on the heat-resistant guide rails 12. It is emphasized that the heat-resistant guide rail is provided with a shaft shoulder in the axial direction of the liner tube 8, so that the rotational motion of the liner tube 8 with the radius as the shaft is limited, and the liner tube 8 can only do the translational motion along the length direction of the heat-resistant guide rail 12.

As shown in fig. 4 and 5, 6 groups of centering liner plates 9 are uniformly distributed on the inner wall of the liner tube 8 in the circumferential direction, the liner tube 8 and the centering liner plates 9 are connected in a welding manner, and when a magnesium rod 11 is placed in the liner tube 8, the centering liner plates 8 automatically center; and the two ends of the magnesium rod 11 are provided with heat insulation end plates 10; the heat insulation end plate 10 and the centering lining plate 9 are matched in a sliding mode. It is emphasized that the centering lining plate 9 is shaped like an isosceles trapezoid, and six groups of guide plates which are uniformly distributed on the circumferential direction form a horn mouth-shaped centering cavity at the inlet and the outlet of the liner tube.

As shown in fig. 6 to 8, the automatic blocking device mainly includes a wire rope set 5, a servo motor 13, a left sliding rack 14, a right sliding rack 15, a wire hook 16, a sliding guide platform 17, a gear 18, a gear shaft 19, a stopper 20, a right support 22, and a left support 21. The servo motor 13 is fixed on the left support 21 and drives the gear shaft 19 to rotate; the left end and the right end of the gear shaft 19 are matched through shaft holes and sleeved on the shaft holes of the left support 21 and the right support 22; the gear shaft 19 is provided with a gear 18, and the gear shaft 19 and the gear 18 are connected through keys; and a left sliding rack 14 and a right sliding rack 15 are arranged on two sides of the gear 18, so that the sliding racks translate up and down, and displacements of the sliding racks in other directions are restricted by the sliding guide rail platform. The left sliding rack 14 and the right sliding rack 15 are respectively provided with a steel wire hook 16 and a stop dog 20; when the gear 18 rotates to drive the left sliding rack 14 to move upwards, the steel wire hook 16 pulls the furnace door to be opened through the steel wire rope group 5, meanwhile, the gear 18 rotates to drive the right sliding rack 15 to move downwards, the blocking function of the liner tube 8 is completed, and the phenomenon that a plurality of bars slide down at a time to influence the production rhythm is avoided.

The utility model discloses a concrete theory of operation: the magnesium rod 11 is sent into the liner tube 8 through a pushing device, automatic centering is completed through the centering liner plate 9, and heat insulation end plates 10 are covered at two ends; then the rear side furnace door 4 is opened, a plurality of processed magnesium rods 11 are loaded at one time, and the liner tubes 8 sleeved outside the magnesium rods slide on the tracks of the heat-resistant guide rails 12 under the action of gravity and are sequentially arranged in a step shape from bottom to top; after the magnesium rod 11 is charged, the rear side furnace door 4 is closed; the resistance wires 7 on the four walls of the furnace body 1 start to work, and heat generated by the resistance wires 7 is radiated to the outer sides of the liner tube 8 and the heat insulation end plate 10 to form a soaking annular heating cavity to uniformly transfer the heat to the magnesium rod 11. When the temperature reaches the required temperature and is kept for a certain time, the servo motor 13 is started, the gear 18 is driven to rotate through the gear shaft 19, the left sliding rack 14 moves upwards and drives the steel wire hook 16 to move upwards, the front side furnace door 4 is pulled to be opened by the steel wire rope group 5, and the first magnesium rod 11 close to the outlet of the furnace body 1 begins to fall; meanwhile, the gear 18 drives the right sliding rack 15 to move downwards, so that the stopper 20 is inserted into the furnace body 1 to block the falling tendency of the second magnesium rod 11 close to the outlet of the furnace body under the action of gravity (as shown in fig. 8); after the first magnesium rod 11 falls, the servo motor 13 rotates reversely, the left sliding rack 14 moves downwards and drives the steel wire hook 16 to move downwards, and the front side furnace door 4 is closed under the action of gravity; meanwhile, the gear 18 drives the right sliding rack 15 to move upwards, the stop dog 20 retracts, and the second magnesium rod 11 close to the outlet of the furnace body falls to the outlet of the furnace body 1 under the action of gravity.

After the first magnesium rod 11 falls down, the first magnesium rod slides into a guide groove of the perforating machine through a guide rail on the perforating machine, a cylinder on the perforating machine is started to push the heat insulation end plate 10 and the magnesium rod 11 to move forwards, and the liner pipe 8 is clamped by the guide ring and falls on the original place. After the magnesium rod is pushed for a certain distance, the heat insulation end plate 10 positioned on the front side in the pushing direction slides into the recovery tank, and the heat insulation end plate 10 on the rear side continuously pushes the magnesium rod 11 to move forwards, so that the one-time biting procedure of the magnesium rod during the oblique rolling perforation is completed.

Claims

1. A uniform heating and heat preservation device for a magnesium rod before an oblique rolling perforation process mainly comprises a liner tube, a centering liner plate, a heat insulation end plate, an upper heat-resistant guide rail, a lower heat-resistant guide rail, a resistance wire, a furnace body, a furnace door guide rail, a furnace frame and an automatic blocking device; wherein 6 groups of centering lining plates are uniformly distributed on the inner wall of the liner tube in the circumferential direction, the liner tube and the centering lining plates are connected in a welding mode, and when a magnesium rod is placed in the liner tube, the centering lining plates automatically center the liner tube; the left end and the right end of the liner tube are provided with heat insulation end plates, notches of the heat insulation end plates are in sliding fit with the centering liner plate to ensure the centering property of the heat insulation end plates, a certain gap is reserved between the heat insulation end plates and the inner wall of the liner tube, and the heat insulation end plates and the centering liner plate are in sliding fit; heat-resisting guide rails are riveted on the left side and the right side of the furnace body, and the liner tube can roll on the heat-resisting guide rails; the heating belt is composed of resistance wires, and the total number of the heating belt is four: the upper heating belt, the lower heating belt, the left heating belt and the right heating belt are respectively arranged on the inner walls of the upper side, the lower side, the left side and the right side of the furnace body; the front side and the rear side of the furnace body are provided with furnace door guide rails which are arranged at the positions of the front and rear furnace door outlets close to the outer wall of the furnace body and ensure the vertical sliding of the furnace doors through the furnace door guide rails; the furnace body is integrally arranged on the furnace frame; the automatic grid blocking device is arranged at the upper side of the furnace body close to the outlet;

automatic check keep off device installs on the furnace body upper surface, and its structure includes: the device comprises a left support, a right support, a servo motor, a sliding guide rail platform, a left sliding rack, a right sliding rack, a gear shaft, a steel wire rope group, a steel wire hook and a stop block; wherein, the servo motor is fixed on a left support positioned on the upper surface of the furnace body and drives the gear shaft to rotate; the left end and the right end of the gear shaft are matched through shaft holes and are sleeved on the shaft holes of the left support and the right support; the gear shaft is provided with a gear, and the gear shaft and the gear are connected through a key; the front side and the rear side of the gear are respectively provided with a left-right sliding rack, the gear rotates to drive the sliding racks to translate up and down, and the displacement of the sliding racks in other directions is slidably restricted by a sliding guide rail platform fixed on the upper surface of the furnace body; the left sliding rack and the right sliding rack are respectively provided with a steel wire hook and a stop block; when the gear rotates to drive the left sliding rack to move upwards, the steel wire hook pulls the furnace door to be opened through the steel wire rope group, meanwhile, the rotation of the gear also drives the right sliding rack to move downwards, and the check block is in contact with the outer surface of the liner tube.

2. The device for uniformly heating and insulating the magnesium rod before the cross piercing process as claimed in claim 1, wherein the distance between the resistance wires of the upper wall and the lower wall in the furnace body and the left end, the right end and the outer surface of the liner tube is 50 mm-80 mm.

3. The apparatus for uniformly heating and maintaining the temperature of a magnesium rod before a cross piercing process according to claim 1, wherein a centering liner, a liner tube and an insulating end plate are sleeved outside the magnesium rod during the heating and tapping process of the magnesium rod.

4. The apparatus for uniformly heating and maintaining the temperature of a magnesium rod before a cross piercing process according to claim 1, wherein the heat-resistant guide rail is formed with a shoulder in an axial direction of the lining tube, and a length direction of the shoulder is perpendicular to the axial direction of the lining tube.

5. The device for uniformly heating and insulating the magnesium rod before the cross piercing process according to claim 1, wherein the centering lining plate is shaped like an isosceles trapezoid, and six groups of guide plates are uniformly distributed on the circumference at the inlet and the outlet of the liner pipe to form a flared centering cavity.

6. The apparatus for uniformly heating and maintaining the temperature of a magnesium rod before a cross piercing process according to claim 1, wherein the furnace body is disposed in an inclined manner with respect to the ground at an angle of about 10 ° to 15 °.

7. The device for uniformly heating and insulating the magnesium rod before the cross piercing process according to claim 1, wherein the furnace doors of the outlet and the inlet are respectively provided with an electric opening device, and the device has three stations of simultaneous opening and closing of two ends, left opening and right closing, and right opening and left closing.