CN103706667A - Device for removing surface oxide layers of high-temperature blanks in hot extrusion process - Google Patents
Device for removing surface oxide layers of high-temperature blanks in hot extrusion process Download PDFInfo
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- CN103706667A CN103706667A CN201310708918.7A CN201310708918A CN103706667A CN 103706667 A CN103706667 A CN 103706667A CN 201310708918 A CN201310708918 A CN 201310708918A CN 103706667 A CN103706667 A CN 103706667A
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- 238000001192 hot extrusion Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 15
- 239000010959 steel Substances 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000003116 impacting effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The invention discloses a device for removing surface oxide layers of high-temperature blanks in a hot extrusion process. The device comprises a high-temperature blank feeding mechanism and an end face oxide layer removing mechanism, wherein high-temperature blanks to be processed are loaded on the high-temperature blank feeding mechanism; the end face oxide layer removing mechanism is arranged on left and right sides of the high-temperature blank feeding mechanism; the end face oxide layer removing mechanism comprises a transverse sliding pair, a first removing roller, a first hydraulic cylinder, a support plate, a connection plate and a frame; the transverse sliding pair is connected with a piston rod of the first hydraulic cylinder through the connection plate; a first driving motor drives the first removing roller which is supported by the support plate to rotate; a plurality of impacting chains are evenly distributed on a roller surface of the first removing roller at fixed intervals. The device is simple in structure, capable of evenly removing surface oxide layers and effectively improving stability of quality of seamless steel tube products and applicable to any oxide layer removing production line of the seamless steel tube products.
Description
Technical field
The present invention relates to a kind of device of removing oxide layer, particularly a kind of high-temperature metal blank for seamless steel pipe hot extrusion technique is removed the device of surface oxide layer, belongs to metalworking technology field.
Background technology
Growing along with seamless steel pipe technology, its manufacturing machine is also in continuous progress.In known seamless steel pipe hot extrusion technique, blank need be heated to 1200 ℃, then again high temperature blank is carried out to extrusion operation.In this process, after high temperature blank at high temperature contacts with air, its surface can produce rapidly oxide layer (being commonly called as oxide layer in industry for ' scale '), and then can affect the surface quality after product processing and moulding.In existing production technology, the equipment of removing high temperature blank oxide layer mainly adopts machinery drum scraper type removing oxide layer equipment, because limit by its structure, the inside and outside wall removing oxide layer of high temperature blank is inhomogeneous, time-consuming, and, also be not suitable for the removing oxide layer operation of hot extrusion heavy caliber seamless steel pipe high temperature blank, to making, hot extruded seamless tube product quality is unstable, even occurs the underproof result of product.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, the device of high temperature blank removal surface oxide layer in a kind of hot extrusion technique is provided, it have simple in structure, removing oxide layer is even, can remove the oxide layer of seamless steel pipe high temperature blank end face, also can remove the oxide layer of inner and outer wall.
Problem of the present invention is solved by following technical scheme:
In hot extrusion technique, high temperature blank is removed a device for surface oxide layer, and it comprises high temperature blank feed mechanism and end face removing oxide layer mechanism, on described high temperature blank feed mechanism, loads pending high temperature blank; Described end face is removed the left and right sides that oxide layer mechanism is located at high temperature blank feed mechanism; Described end face is removed oxide layer mechanism and is comprised horizontal sliding pair, the first kicker cylinder, the first hydraulic cylinder, gripper shoe, connecting plate and support; Described horizontal sliding pair is fixed on support, and gripper shoe is fixed on horizontal sliding pair; Described horizontal sliding pair comprises again slide plate and slide rail, the affixed connecting plate in described slide plate bottom surface, and described connecting plate is connected with the piston rod of the first hydraulic cylinder; Described gripper shoe and the first drive motors are fixed on slide plate, and described gripper shoe supports the first kicker cylinder, and the first kicker cylinder is driven by the first drive motors by belt pulley, and on the roll surface of the first kicker cylinder, uniform many groups of fixed intervals impact chain.
In above-mentioned hot extrusion technique, high temperature blank is removed the device of surface oxide layer, and described high temperature blank feed mechanism comprises roller, turning rolls, power transmission shaft, the second hydraulic cylinder, the second drive motors, joint, road wheel and chute; Described road wheel is located on turning rolls respectively, and each roller is connected by belt transmission with power transmission shaft respectively; One end second drive motors driven rotary of described power transmission shaft; Described road wheel is located at the bottom of turning rolls, the walking of sliding on the chute matching with it; The piston rod of described the second hydraulic cylinder is connected with turning rolls by the joint on turning rolls.
In above-mentioned hot extrusion technique, high temperature blank is removed the device of surface oxide layer, set up inwall and remove oxide layer mechanism, described inwall is removed oxide layer mechanism and is comprised the 3rd drive motors, the 3rd hydraulic cylinder, the 4th hydraulic cylinder, the second kicker cylinder, the second kicker cylinder tail spindle, left guide type shoe, right guide type shoe and horizontal sliding mechanism; Described the 3rd hydraulic cylinder is vertically fixed on left guide type shoe, and its piston rod is fixed with the first guide plate of carrying the 3rd drive motors, and described the second kicker cylinder drives rotation by the 3rd drive motors; Described the second kicker cylinder is hollow structure, and its roller wall is provided with a plurality of hole for water sprayings, and on the roller surface of described the second kicker cylinder, interval is fixed with many groups and impacts chain; On described right guide type shoe, be vertically provided with the 4th hydraulic cylinder, its piston rod is fixed with the second guide plate that carries the second kicker cylinder tail spindle; Described horizontal sliding mechanism is located at the bottom of left guide type shoe, drives left guide type shoe to move left and right.
In above-mentioned hot extrusion technique, high temperature blank is removed the device of surface oxide layer, and described horizontal sliding mechanism comprises the 5th hydraulic cylinder, the horizontal sliding axis of guide, sliding sleeve and limited block; Described left guide type shoe is socketed on the horizontal sliding axis of guide by being fixed on the sliding sleeve of bottom; The piston rod of described the 5th hydraulic cylinder is connected with sliding sleeve; Described limited block is located at two ends, horizontal sliding axis of guide left and right.
In above-mentioned hot extrusion technique, high temperature blank is removed the device of surface oxide layer, sets up outer wall and removes oxide layer mechanism, and described outer wall is removed oxide layer mechanism and comprised the 3rd kicker cylinder, the 4th drive motors, the 6th hydraulic cylinder and the 7th hydraulic cylinder; The two ends of described the 3rd kicker cylinder are fixed on by axle sleeve on the piston rod of the 6th hydraulic cylinder and the 7th hydraulic cylinder, and the 3rd kicker cylinder is driven by the 4th drive motors; On the roll surface of described the 3rd kicker cylinder, interval is fixed many groups and is impacted chain.
In above-mentioned hot extrusion technique, high temperature blank is removed the device of surface oxide layer, sets up spray cooling mechanism, and described spray cooling mechanism comprises water tank and water pump, and described water tank is communicated with the inner chamber of the second kicker cylinder through water pump.
In above-mentioned hot extrusion technique, high temperature blank is removed the device of surface oxide layer, set up and impact chain fixed head, described in to impact chain fixed head be rectangular structure, described in impact chain and be articulated in and impact on chain fixed head.
The present invention removes oxide layer mechanism, outer wall removing oxide layer mechanism and inwall by end face and removes oxide layer mechanism, can effectively remove seamless steel pipe high temperature blank in hot extrusion process, because contact the oxide layer producing with air.The present invention relies on high temperature blank feed mechanism that high temperature blank is progressively transported to each and removes in oxide layer mechanism, rely on end face to remove oxide layer mechanism and remove the oxide layer on two end faces of high temperature blank, rely on inwall to remove the oxide layer that high temperature blank inwall is removed by oxide layer mechanism, rely on outer wall to remove the oxide layer that high temperature blank outer surface is removed by oxide layer mechanism.In addition, uniform many groups of the present invention's fixed intervals on the first kicker cylinder, the second kicker cylinder and the 3rd kicker cylinder impact chain, when impacting chain and rotate and knock on seamless steel pipe high temperature blank, utilization impacts the rigid impact of chain and the flexibility that chain has concurrently, can reach the effect of scale removal comprehensively and up hill and dale.That the present invention has is simple in structure, simple operation, the uniform feature of removing oxide layer, and can effectively improve the stability of seamless steel pipe product quality, is applicable to remove in any hot extrusion technique the production occasion of high temperature blank oxide layer.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is top view of the present invention;
Fig. 3 is that K is to view;
Fig. 4 is the left view of high temperature blank feed mechanism.
In figure, each list of reference numerals is: 1. inwall is removed oxide layer mechanism, 2. outer wall is removed oxide layer mechanism, 3. end face is removed oxide layer mechanism, 4. high temperature blank feed mechanism, 5. support, 6. gripper shoe, 7. connecting plate, 8-1. the first kicker cylinder, 8-2. the second kicker cylinder, 8-3. the 3rd kicker cylinder, 9-1～9-7. the first hydraulic cylinder～seven hydraulic cylinder, 10. impact chain fixed head, 11. impact chain, 12. slide plates, 13. slide rails, 14-1～14-4. the first drive motors～four drive motors, 15. rollers, 16. turning rolls, 17. power transmission shafts, 18. road wheels, 19. chutes, 20. left guide type shoes, 21. right guide type shoes, 22, the horizontal sliding axis of guide, 23. sliding sleeves, 24. limited blocks, 25. balancing pull rods, 26. second kicker cylinder tail spindles, 27-1. the first guide plate, 27-2. the second guide plate, 28. water tanks, 29. water pumps, 30. joints, 31. conveyer belts, 32. high temperature blanks, 33. hole for water sprayings.
The specific embodiment
Referring to Fig. 1,2,3 and Fig. 4, the present invention removes oxide layer mechanism 3, outer wall by end face and removes oxide layer mechanism 2 and inwall and remove oxide layer mechanism 1 and form; Wherein, end face removing oxide layer mechanism 3 comprises horizontal sliding pair, the first kicker cylinder, the first drive motors, gripper shoe and support; Described support 5 is provided with horizontal sliding pair, the first kicker cylinder and gripper shoe; Described horizontal sliding pair utilizes the first hydraulic cylinder 9-1, making end face remove oxide layer winding machine moves left and right, reach the effect of the seamless steel pipe high temperature blank of any length of coupling, described the first hydraulic cylinder 9-1 and slide rail 13 are all fixed on support 5, the piston rod of described the first hydraulic cylinder 9-1 is connected with slide plate 12 by connecting plate 7, and the both sides of described slide rail and slide plate both sides are that dovetail type is slidably connected.Described slide plate upper end is fixed with gripper shoe, and described gripper shoe supports the first kicker cylinder 8-1, and the first kicker cylinder 8-1 drives 14-1 by the first drive motors, and on the roll surface of the first kicker cylinder, uniform many groups of fixed intervals impact chain.The first kicker cylinder, under the driving of the first drive motors, makes to impact chain and rotates and knock on the surface of seamless steel pipe high temperature blank, utilizes the rigidity while impacting chain shock end face and impacts the flexibility that chain has concurrently, thereby improving the effect of removing oxide layer.
Inwall is removed oxide layer mechanism 1 and is comprised the 3rd drive motors 14-3, the 3rd hydraulic cylinder 9-3, the 4th hydraulic cylinder 9-4, the second kicker cylinder 8-2, the second kicker cylinder tail spindle 26, left guide type shoe 20, right guide type shoe 21He horizontal sliding mechanism; Inwall is removed oxide layer mechanism 1 by the 3rd hydraulic cylinder 9-3 and the 4th hydraulic cylinder 9-4, realize inwall and remove the height adjusting of oxide layer mechanism 1, can after adjusting, be applicable to the seamless steel pipe high temperature blank inwall removing oxide layer work of multiple diameter, horizontal sliding mechanism, for regulating inwall to remove the position, left and right of oxide layer mechanism 1, is convenient to connect with the second kicker cylinder tail spindle 26 from the annulus of high temperature blank passes.Identical with the first kicker cylinder on described the second kicker cylinder outer wall, all irregular spacing is provided with many groups and impacts chain 11, is convenient to the oxide layer of the removal inwall of efficient quick.Described horizontal sliding mechanism is located at the bottom of left guide type shoe 20, and described the second kicker cylinder 8-2 outer surface is provided with and impacts chain fixed head 10.Described sliding motion unit comprises the 5th hydraulic cylinder 9-5, the horizontal sliding axis of guide 22, sliding sleeve 23 and limited block 24; Described sliding sleeve 23 is fixed on the bottom of left guide type shoe 20, and is socketed on the horizontal sliding axis of guide 22; The piston rod of described the 5th hydraulic cylinder 9-5 is connected with sliding sleeve 23; Described limited block 24 is located at the two ends, left and right of the horizontal sliding axis of guide 22, and anti-anti-skid sheath 23 exceeds sliding scale.
Outer wall is removed oxide layer mechanism and is comprised the 3rd kicker cylinder 8-3, balancing pull rod 25, the 4th drive motors 14-4, the 6th hydraulic cylinder 9-6 and the 7th hydraulic cylinder 9-7; Described outer wall is removed oxide layer mechanism and is comprised the 3rd kicker cylinder, balancing pull rod, the 4th drive motors, the 6th hydraulic cylinder and the 7th hydraulic cylinder; The two ends of described the 3rd kicker cylinder by axle sleeve be fixed on the 6th, on the piston rod of the 7th hydraulic pressure, and one end is connected with the moving motor-driven of 4 wheel driven; On the roll surface of described the 3rd kicker cylinder, uniform many groups of fixed intervals impact chain; Described balancing pull rod 25 two ends are connected with the 7th hydraulic cylinder 9-7 with the 6th hydraulic cylinder 9-6 respectively, prevent that the situation of dislocation from occurring.
High temperature blank feed mechanism 4 comprises roller 15, turning rolls 16, power transmission shaft 17, the second hydraulic cylinder 9-2, the second drive motors 14-2, joint 30, road wheel 18 and chute 19; Described road wheel 18 is located at respectively on turning rolls 16, and each roller 15 is in transmission connection with power transmission shaft 17 respectively; One end of described power transmission shaft 17 is by the second drive motors 14-2 driven rotary; When high temperature blank 32 is placed on after roller 15, along with the rotation of roller 15, rotate, make the outer surface removing oxide layer of high temperature blank 32 more even.Described road wheel 18 is located at the bottom of turning rolls 16, is to slide on its chute matching 19, and the piston rod of described the second hydraulic cylinder 9-2 is connected with turning rolls 16 by joint 30, makes it that high temperature blank 32 is transported to each mechanism, carries out removing oxide layer work.
The present invention in use, first the high temperature blank of seamless steel pipe is positioned on high temperature blank 32 feed mechanisms by manipulator, in the transporting of high temperature blank feed mechanism, by end face, remove oxide layer mechanism 3, outer wall removing oxide layer mechanism 2 and inwall successively and remove oxide layer mechanism 1, carry out removing oxide layer work, each mechanism of the present invention can regulate according to the size of high temperature blank, makes it applied widely, nowadays facilitation more, met the theory of production and construction fast.In addition, the present invention has also set up spray cooling mechanism, by utilizing water tank and water pump, water is injected in the second kicker cylinder, at the hole for water spraying by the second kicker cylinder, be ejected in the inwall of high temperature blank, by low temperature Quench oxide skin, the impulsive force of water is removed oxide skin simultaneously.The removing oxide layer of steel billet inwall impacts than the simple High Rotation Speed chain that uses like this, removes more thorough.
Hydraulic cylinder of the present invention is the hydraulic cylinder of UY type hydraulic cylinder or CD250 series.
Claims (7)
1. in a hot extrusion technique, high temperature blank is removed the device of surface oxide layer, it is characterized in that: it comprises high temperature blank feed mechanism (4) and end face removing oxide layer mechanism (3), on described high temperature blank feed mechanism, loads pending high temperature blank (32); Described end face is removed the left and right sides that oxide layer mechanism (3) is located at high temperature blank feed mechanism (4); Described end face is removed oxide layer mechanism (3) and is comprised horizontal sliding pair, the first kicker cylinder (8-1), the first hydraulic cylinder (9-1), gripper shoe (6), connecting plate (7) and support (5); It is upper that described horizontal sliding pair is fixed on support (5), and gripper shoe (6) is fixed on horizontal sliding pair; Described horizontal sliding pair comprises again slide plate (12) and slide rail (13), the affixed connecting plate in described slide plate (12) bottom surface (7), and described connecting plate (7) is connected with the piston rod of the first hydraulic cylinder (9-1); Described gripper shoe (6) and the first drive motors (14-1) are fixed on slide plate (12), described gripper shoe (6) supporting the first kicker cylinder (8-1), the first kicker cylinder (8-1) is driven by the first drive motors (14-1) by belt pulley, and on the roll surface of the first kicker cylinder (8-1), uniform many groups of fixed intervals impact chain (11).
2. high temperature blank is removed the device of surface oxide layer in hot extrusion technique according to claim 1, it is characterized in that: described high temperature blank feed mechanism (4) comprises roller (15), turning rolls (16), power transmission shaft (17), the second hydraulic cylinder (9-2), the second drive motors (14-2), joint (30), road wheel (18) and chute (19); It is upper that described road wheel (18) is located at respectively turning rolls (16), and each roller (15) is in transmission connection by belt (31) with power transmission shaft (17) respectively; One end the second drive motors (14-2) driven rotary of described power transmission shaft (17); Described road wheel (18) is located at the bottom of turning rolls (16), in the upper walking of sliding of the chute matching with it (19); The piston rod of described the second hydraulic cylinder (9-2) is connected with turning rolls (16) by the joint (30) on turning rolls (16).
3. according to high temperature blank in hot extrusion technique described in claim 1 or 2, remove the device of surface oxide layer, it is characterized in that: set up inwall and remove oxide layer mechanism (1), described inwall is removed oxide layer mechanism (1) and comprised the 3rd drive motors (14-3), the 3rd hydraulic cylinder (9-3), the 4th hydraulic cylinder (9-4), the second kicker cylinder (8-2), the second kicker cylinder tail spindle (26), left guide type shoe (20), right guide type shoe (21) and horizontal sliding mechanism; Described the 3rd hydraulic cylinder (9-3) is vertically fixed on left guide type shoe (20), its piston rod is fixing with first guide plate (27-1) of carrying the 3rd drive motors (14-3), and described the second kicker cylinder (8-2) drives rotation by the 3rd drive motors (14-3); Described the second kicker cylinder (8-2) is hollow structure, and its roller wall is provided with a plurality of hole for water sprayings (33), and on the roller surface of described the second kicker cylinder (8-2), interval is fixed with many groups and impacts chain (11); On described right guide type shoe (21), be vertically provided with the 4th hydraulic cylinder (9-4), its piston rod is fixing with the second guide plate (27-2) that carries the second kicker cylinder tail spindle (26); Described horizontal sliding mechanism is located at the bottom of left guide type shoe (20), drives left guide type shoe (20) to move left and right.
4. high temperature blank is removed the device of surface oxide layer in hot extrusion technique according to claim 3, it is characterized in that: described horizontal sliding mechanism comprises the 5th hydraulic cylinder (9-5), the horizontal sliding axis of guide (22), sliding sleeve (23) and limited block (24); Described left guide type shoe (20) is socketed on the horizontal sliding axis of guide (22) by being fixed on the sliding sleeve (23) of bottom; The piston rod of described the 5th hydraulic cylinder (9-5) is connected with sliding sleeve (23); Described limited block (24) is located at the horizontal sliding axis of guide (22) two ends, left and right.
5. high temperature blank is removed the device of surface oxide layer in hot extrusion technique according to claim 4, it is characterized in that: set up outer wall and remove oxide layer mechanism (1), described outer wall is removed oxide layer mechanism (1) and comprised the 3rd kicker cylinder (8-3), the 4th drive motors (14-4), the 6th hydraulic cylinder (9-6) and the 7th hydraulic cylinder (9-7); The two ends of described the 3rd kicker cylinder (8-3) are fixed on by axle sleeve on the piston rod of the 6th hydraulic cylinder (9-6) and the 7th hydraulic cylinder (9-7), and the 3rd kicker cylinder is driven by the 4th drive motors (14-4); On the roll surface of described the 3rd kicker cylinder (8-3), interval is fixed many groups and is impacted chain (11).
6. high temperature blank is removed the device of surface oxide layer in hot extrusion technique according to claim 5, it is characterized in that: set up spray cooling mechanism, described spray cooling mechanism comprises water tank (28) and water pump (29), and described water tank (28) is communicated with the inner chamber of the second kicker cylinder (8-2) through water pump (29).
7. high temperature blank is removed the device of surface oxide layer in hot extrusion technique according to claim 6, it is characterized in that: set up and impact chain fixed head, the described chain fixed head that impacts is rectangular structure, described in impact chain (11) and be articulated in and impact on chain fixed head (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310708918.7A CN103706667B (en) | 2013-12-20 | 2013-12-20 | In a kind of hot extrusion technique, high temperature blank removes the device of surface oxide layer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310708918.7A CN103706667B (en) | 2013-12-20 | 2013-12-20 | In a kind of hot extrusion technique, high temperature blank removes the device of surface oxide layer |
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| CN103706667A true CN103706667A (en) | 2014-04-09 |
| CN103706667B CN103706667B (en) | 2016-02-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4004374A (en) * | 1974-08-07 | 1977-01-25 | Joseph Johannes Maria Annegarn | Descaling bent rod with separated cleaning particles |
| US4218800A (en) * | 1979-03-16 | 1980-08-26 | Acme Manufacturing Company | Planetary grinder and polisher |
| CN2312775Y (en) * | 1996-07-31 | 1999-04-07 | 镇海炼油化工股份有限公司 | Rust-removing machine for pipe |
| CN102039329A (en) * | 2011-01-04 | 2011-05-04 | 马鞍山钢铁股份有限公司 | Mechanical descaler |
| CN102921766A (en) * | 2012-11-13 | 2013-02-13 | 河北宏润重工股份有限公司 | Scale removing equipment of high temperature preform body in seamless steel tube hot extrusion process |
-
2013
- 2013-12-20 CN CN201310708918.7A patent/CN103706667B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4004374A (en) * | 1974-08-07 | 1977-01-25 | Joseph Johannes Maria Annegarn | Descaling bent rod with separated cleaning particles |
| US4218800A (en) * | 1979-03-16 | 1980-08-26 | Acme Manufacturing Company | Planetary grinder and polisher |
| CN2312775Y (en) * | 1996-07-31 | 1999-04-07 | 镇海炼油化工股份有限公司 | Rust-removing machine for pipe |
| CN102039329A (en) * | 2011-01-04 | 2011-05-04 | 马鞍山钢铁股份有限公司 | Mechanical descaler |
| CN102921766A (en) * | 2012-11-13 | 2013-02-13 | 河北宏润重工股份有限公司 | Scale removing equipment of high temperature preform body in seamless steel tube hot extrusion process |
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