CN214684245U - Hot metal bottle heat preservation lid adds takes off device - Google Patents
Hot metal bottle heat preservation lid adds takes off device Download PDFInfo
- Publication number
- CN214684245U CN214684245U CN202120549113.2U CN202120549113U CN214684245U CN 214684245 U CN214684245 U CN 214684245U CN 202120549113 U CN202120549113 U CN 202120549113U CN 214684245 U CN214684245 U CN 214684245U
- Authority
- CN
- China
- Prior art keywords
- heat
- cover
- hot
- plate
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model belongs to the technical field of metallurgy, and provides a hot metal bottle heat preservation cover adding and uncovering device, which comprises two heat preservation cover bodies, a transmission frame, a sealed heat preservation apron plate and an adjusting device, wherein the two heat preservation cover bodies form a circle and cover on a hot metal bottle mouth; one end of each transmission frame is rotatably arranged on the hot metal ladle frame, and the other end of each transmission frame is respectively connected with the two heat preservation cover bodies to drive the heat preservation cover/body to move; the sealing heat-preservation skirtboard is arranged at the lower end of the heat-preservation cover body and surrounds and covers the outer side of the mouth of the molten iron tank; the adjusting device is arranged at the lower end of the sealed heat-insulating skirtboard. Through the technical scheme, the problems that the structural design of the heat-insulating cover is unreasonable and imperfect and the sealing effect is poor are solved.
Description
Technical Field
The utility model belongs to the technical field of the metallurgy, indicate especially a hot metal bottle heat preservation lid adds takes off device.
Background
The hot metal ladle transport vechicle is used for metallurgical enterprise to transport the molten iron and carries out the pouring iron piece before the pig machine or transports to the workshop of making steel and pour into the hot metal into the metal mixer stove and store, or directly pours into the special vehicle of steelmaking in the steelmaking stove with the molten iron, and the hot metal ladle transport vechicle includes the frame and sets up the hot metal ladle on the frame, in order to keep warm, can set up the heat preservation lid in hot metal ladle tank mouth department.
At present, with the successful application of several domestic large-scale steel enterprises, the production process technology of the steel-iron interface from one tank to the bottom is gradually accepted and adopted, and is more and more popular. The 'one-pot-to-bottom' process cancels a molten iron reladling station in a steel-making workshop, shortens the process flow, has compact overall layout, has lower one-time investment and operation cost compared with the transportation process of a torpedo car, can also reduce consumption and emission, and brings great economic and social benefits to enterprises.
However, the process of "one tank is at the bottom" has the disadvantage that the hot metal tank is always in open operation, smoke is dazzling and smoke dust flies every day, so that the heat loss is huge, and the process also does not accord with the policy of energy conservation and environmental protection. If the temperature difference is larger in rainy days and snowy days especially in northern areas, the heat loss is more serious. The severe heat loss can accelerate the crusting at the edge of the tank, and the service life of the ladle lining in the tank is shortened due to uneven temperature of molten iron in the tank.
Although the rice husk heat preservation method has little effect. Some enterprises are additionally provided with the heat preservation cover, but the heat preservation cover is not perfect enough in aspects of structural design rationality, manufacturing cost, operating cost, service life, convenience in maintenance and repair and the like, and is not widely applied. In order to ensure the temperature required by molten iron steelmaking, the tapping temperature of the molten iron can only be increased at present, and the method is also a huge expense for enterprises producing millions of tons of steel products annually. Therefore, a thermal insulation cover adding and uncovering device with reasonable structure and good sealing effect is needed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main objective lies in providing a hot metal bottle heat preservation lid adds takes off device to solve heat preservation lid structural design unreasonable, imperfect, the poor problem of sealed effect.
For solving the technical problem, the utility model discloses the technical scheme who takes lies in:
a hot metal bottle heat preservation lid adds takes off device includes:
the two heat-preservation cover bodies form a circle and cover the mouth of the hot-metal bottle;
the two transmission frames are provided, one ends of the two transmission frames are rotatably arranged on the hot metal ladle frame, and the other ends of the two transmission frames are respectively connected with the two heat-preservation cover bodies to drive the heat-preservation cover bodies to move;
the sealing heat-preservation skirtboard is arranged at the lower end of the heat-preservation cover body and surrounds and covers the outer side of the mouth of the molten iron tank;
and the adjusting device is arranged at the lower end of the sealed heat-insulation skirtboard and is used for adjusting the contact tightness between the sealed heat-insulation skirtboard and the outer wall of the molten iron tank.
As a further technical solution, the sealing and heat-insulating apron board includes:
the fixing plate is a semi-arc plate and is fixedly arranged on the heat-insulating cover body;
the upper end of the sealing cloth is arranged on the fixing plate;
the clamping plate is a semi-arc plate, is clamped at the lower end of the sealing cloth and is attached to the outer wall of the molten iron tank.
As a further technical solution, the adjusting device is provided in plurality, and is disposed around the fixing plate, and each of the adjusting devices includes:
the angle steel is provided with a mounting hole;
one end of the movable screw rod is arranged on the clamping plate, and the other end of the movable screw rod penetrates through the mounting hole and is locked by a nut;
and the compression spring is sleeved on the movable screw rod, one end of the compression spring acts on the clamping plate, and the other end of the compression spring acts on the angle steel.
As a further technical solution, the thermal insulation cover body includes:
the cover plate is semicircular, and the radius of the cover plate is 150-200 mm larger than that of the hot-metal ladle;
the high-temperature-resistant fiber felt is fixedly arranged on the lower surface of the cover plate;
the coaming is arranged around the arc-shaped edge of the cover plate, and the fixing plate is arranged on the coaming.
As a further technical scheme, the bottom end of the high-temperature resistant fiber felt is higher than the top end of the mouth of the hot-metal bottle in the state that the heat-preservation cover body covers the mouth of the hot-metal bottle.
As a further technical scheme, the heat preservation cover adding and uncovering device further comprises:
an alignment compensation device, the alignment compensation device comprising:
a gusset disposed on one of the cover panels;
an external corner disposed on the gusset;
and the internal corner is arranged on the other cover plate and is matched with the external corner.
As a further technical solution, the transmission frame includes:
the hot metal ladle comprises a hot metal ladle frame, a hot metal ladle frame and a hot metal ladle, wherein the hot metal ladle frame is provided with a hot metal ladle, the hot metal ladle frame is provided with a hot metal ladle frame and a hot metal ladle frame, and the hot metal ladle frame is provided with a hot metal ladle frame and a hot metal ladle frame;
and two ends of the connecting rod are respectively connected with the second rods.
As a further technical scheme, the rod tee is rotationally arranged on the hot metal bottle frame through a driving mechanism, and the driving mechanism comprises:
the mounting seat is arranged on the hot metal ladle frame;
the motor speed reducer is arranged on the mounting seat;
the transmission shaft, the one end of transmission shaft with motor reducer key-type connection, the other end of transmission shaft passes through the rolling bearing and rotates the setting and be in on the mount pad, pole three sets up rotate along with it on the transmission shaft.
As a further technical scheme, the sealing cloth is made of a temperature-resistant elastic material, and the clamping plate is made of a plastic material.
The utility model has the advantages that:
the utility model discloses simple structure increases the design of sealed heat preservation skirtboard, and sealed face is moved the molten iron jar outer wall by the hot metal bottle jar mouth, and adjusting device makes sealed heat preservation skirtboard hug closely the hot metal bottle outer wall, stops the heat convection, and is sealed effectual.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of the closed state of the thermal insulation cover body of the present invention;
FIG. 2 is a schematic structural view of the open state of the heat preservation cover body of the present invention;
FIG. 3 is a schematic view of the three-dimensional structure of the thermal insulation cover body of the present invention;
FIG. 4 is a schematic view of the sealing and heat-insulating structure of the present invention;
FIG. 5 is a schematic view of the three-dimensional structure of the transmission frame of the present invention;
fig. 6 is a schematic perspective view of the alignment compensation device of the present invention.
Description of the reference numerals
1. The heat preservation cover comprises a heat preservation cover body, 11, a cover plate, 12, a high-temperature resistant fiber felt, 13, a surrounding plate, 2, a transmission frame, 21, a rotating rod, 211, a first rod, 212, a second rod, 213, a third rod, 22, a connecting rod, 3, a sealed heat preservation skirt board, 31, a fixing plate, 32, sealing cloth, 33, a clamping plate, 4, an adjusting device, 41, angle steel, 42, a movable screw, 43, a compression spring, 5, an alignment compensation device, 51, an angle plate, 52, an external corner, 53, an internal corner, 6, a driving mechanism, 61, a mounting seat, 62 and a motor reducer.
Detailed Description
The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the drawings in the embodiment of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1-6, the utility model provides a hot metal bottle heat preservation cover adds takes off device, including heat preservation cover body 1, driving frame 2, sealed heat preservation skirtboard 3, adjusting device 4, adjust compensation arrangement 5 and actuating mechanism 6 well.
The two heat preservation cover bodies 1 form a circle to cover the mouth of the hot metal ladle, each heat preservation cover body 1 comprises a cover plate 11, a high-temperature resistant fiber felt 12 and a surrounding plate 13, each cover plate 11 is semicircular, the radius of each cover plate 11 is 150-200 mm larger than the radius of the hot metal ladle, a reinforcing rib plate is arranged on the upper surface of each cover plate 11 to enhance the strength of each cover plate 11, the high-temperature resistant fiber felt 12 is fixedly arranged on the lower surface of each cover plate 11 to enhance the heat preservation effect, the height of each high-temperature resistant fiber felt 12 is higher than that of the mouth of the hot metal ladle in the state that each heat preservation cover body 1 covers the mouth of the hot metal ladle, namely the bottom end of each high-temperature resistant fiber felt 12 is higher than the top end of the mouth of the hot metal ladle, the high-temperature resistant material is prevented from falling off due to the fact that the high-temperature resistant fiber felts 12 and the mouth of the hot metal ladle are cut mutually, one end of each surrounding plate 13 is arranged on the arc-shaped edge of each cover plate 11 and extends downwards, and a plurality of bolt holes are arranged on each surrounding plate 13, used for installing the sealed heat-preservation skirtboard 3.
The two transmission frames 2 respectively drive the two heat-preservation cover bodies 1 to move, each transmission frame 2 comprises two rotating rods 21 and two connecting rods 22, each rotating rod 21 comprises a first rod 211, a second rod 212 and a third rod 213 which are vertically connected in sequence, one end, away from the second rod 212, of the first rod 211 is connected with the heat-preservation cover body 1, one end, away from the second rod 212, of the third rod 213 is rotatably arranged on the hot metal ladle frame, and two ends of each connecting rod 22 are respectively connected with the two second rods 212; the third rod 213 is rotatably arranged on the hot metal ladle frame through the driving mechanism 6, the driving mechanism 6 comprises an installation seat 61, a motor speed reducer 62 and a transmission shaft, the installation seat 61 is arranged on the hot metal ladle frame, the motor speed reducer 62 is arranged on the installation seat 61, the transmission shaft is arranged on the installation seat 61, the motor speed reducer 62 is in key connection with one end of the transmission shaft, the other end of the transmission shaft is rotatably arranged on the installation seat 61 through a bearing with a seat, and the third rod 213 is arranged on the transmission shaft and rotates along with the transmission shaft; the motor reducer 62 drives the transmission frame 2 to rotate through the transmission shaft, and the outer side of the motor reducer 62 is provided with a protective cover to protect the motor reducer 62 and prolong the service life of the motor reducer. The common thermal insulation cover adding and uncovering device adopts a hydraulic system as power to control the movement of the cover plate 11, but the hydraulic system as power has potential safety hazard, and the motor reducer 62 is safe and reliable.
Sealed heat preservation skirtboard 3 sets up the lower extreme at heat preservation lid body 1, around the cladding in the outside of hot metal bottle jar mouth, sealed heat preservation skirtboard 3 includes fixed plate 31, sealed cloth 32 and splint 33, fixed plate 31 is the semi-arc board, the setting is on bounding wall 13, the upper end of sealed cloth 32 sets up on fixed plate 31, splint 33 is the semi-arc board, press from both sides the lower extreme of establishing sealed cloth 32, and paste and establish on the hot metal bottle outer wall, sealed cloth 32 is flexible temperature resistant elastic material, like the fibre cloth, splint 33 are the plastic material that the sheet steel made, be convenient for adjust its form, splint 33's cross-section is the U type, press from both sides tightly sealed cloth 32.
Adjusting device 4 sets up the lower extreme at sealed heat preservation skirtboard 3, adjust the compactness of sealed heat preservation skirtboard 3 and molten iron jar outer wall contact, adjusting device 4 is a plurality of, set up around fixed plate 31, every adjusting device 4 includes angle steel 41, activity screw rod 42 and compression spring 43, the mounting hole has been seted up on the angle steel 41, the one end setting of activity screw rod 42 is on splint 33, the other end passes the mounting hole, and through nut locking, compression spring 43 cover is established on activity screw rod 42, and one end acts on splint 33, the other end acts on angle steel 41.
The alignment compensation device 5 comprises a corner plate 51, an external corner 52 and an internal corner 53, wherein the corner plate 51 is arranged on one cover plate 11 and is positioned at the straight edge of the semicircular cover plate 11, the external corner 52 is arranged on the corner plate 51, the internal corner 53 is arranged on the other cover plate 11 and is matched with the external corner 52, the internal corner 53 and the external corner 52 are similar to the internal corner and the external corner in the building industry, the external corner 52 refers to a protruded corner and is a triangular piece, the internal corner 53 refers to a recessed corner and is an L-shaped piece containing a recessed corner, the internal corner 53 and the external corner 52 are respectively arranged near the straight edges of the two semicircular cover plates 11, when the two semicircular cover plates 11 are combined to form a circle, the external corner 52 is matched with the internal corner 53, namely the external corner 52 of the triangle extends into the L-shaped internal corner 53 of the recessed corner, the positions of the two cover plates 11 are limited, so that the two semicircular cover plates 11 are aligned, the deformation of the transmission frame 2 is avoided, and meanwhile, the angle plate 51 can cover gaps which cannot be generated due to the folding of the heat-insulating cover plates 11 on the two sides, so that the heat-insulating effect is improved.
The embodiment comprises two semicircular heat-preservation cover bodies 1, a sealed heat-preservation apron board 3, a transmission frame 2, a driving mechanism 6 and an adjusting device 4 which are symmetrically designed, and the semicircular heat-preservation cover bodies, the sealed heat-preservation apron board, the transmission frame, the driving mechanism 6 and the adjusting device are respectively arranged on two sides of the central line of the hot metal ladle transport vehicle. In the cover opening process, the motor reducer 62 drives one end of the rod III 213 to rotate, so that the transmission frame 2 rotates to drive the two heat-insulation cover bodies 1 and the sealed heat-insulation skirt plate 3 arranged below the heat-insulation cover bodies to move towards the two sides of the hot-metal ladle, so that the mouth of the hot-metal ladle is opened, and the normal operation of hoisting the hot-metal ladle and the hook of the tank car is not influenced. In the capping process, the motor reducer 62 drives one end of the third driving rod 213 to rotate reversely, so that the transmission frame 2 rotates reversely to drive the two heat-insulating cap bodies 1 and the sealed heat-insulating apron plate 3 arranged below the two heat-insulating cap bodies to fold from the two sides to the middle of the molten iron tank, so that the clamping plate 33 is tightly attached to the outer wall of the molten iron tank, an inverted cone cavity is formed to cover the molten iron tank, and the functions of heat insulation, dust fall and rain and snow prevention are achieved. The sealed face of this embodiment is moved the molten iron jar outer wall by the hot metal bottle jar mouth, and the regulation of being convenient for stops the heat convection, and is sealed effectual. The adjusting device 4 is used for adjusting the tightness between the clamping plate 33 and the outer wall of the molten iron tank after the parts are installed or replaced, and the specific adjusting steps are as follows: the nut is rotated, adjusts the length that movable screw 42 is located splint 33 and angle steel 41 centre to control movable screw 42 and adjust splint 33's diameter in the radial position of splint 33, compression spring 43 keeps a thrust to splint 33 all the time simultaneously, guarantees the compactness of splint 33 and hot-metal bottle outer wall contact, strengthens sealed effect and the heat preservation effect of sealed heat preservation skirtboard 3, and the good reliability.
The foregoing description is only of the preferred embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Claims (9)
1. The utility model provides a hot metal bottle keeps warm and covers and takes off device which characterized in that includes:
the hot metal ladle comprises two heat preservation cover bodies (1), wherein the two heat preservation cover bodies (1) form a circle to cover the mouth of the hot metal ladle;
the two transmission frames (2) are arranged, one end of each transmission frame (2) is rotatably arranged on the hot metal ladle frame, and the other end of each transmission frame is respectively connected with the two heat-preservation cover bodies (1) to drive the heat-preservation cover bodies (1) to move;
the sealing heat-preservation skirtboard (3) is arranged at the lower end of the heat-preservation cover body (1) and surrounds and covers the outer side of the mouth of the molten iron tank;
and the adjusting device (4) is arranged at the lower end of the sealed heat-insulating skirtboard (3) and is used for adjusting the contact tightness between the sealed heat-insulating skirtboard (3) and the outer wall of the molten iron tank.
2. The hot-metal ladle thermal cover uncovering device as claimed in claim 1, wherein the sealed thermal skirt (3) comprises:
the fixing plate (31), the said fixing plate (31) is a semi-arc plate, fix and set up on the said insulation cover body (1);
a sealing cloth (32), the upper end of the sealing cloth (32) is arranged on the fixing plate (31);
splint (33), splint (33) are half arc plate, press from both sides and establish the lower extreme of sealed cloth (32), and paste and establish on the molten iron jar outer wall.
3. The hot-metal bottle insulation cover uncovering device according to claim 2, wherein the number of the adjusting devices (4) is multiple, and the adjusting devices (4) are arranged around the fixing plate (31), and each adjusting device (4) comprises:
the angle steel (41), wherein the angle steel (41) is provided with a mounting hole;
one end of the movable screw rod (42) is arranged on the clamping plate (33), and the other end of the movable screw rod (42) penetrates through the mounting hole and is locked through a nut;
compression spring (43), compression spring (43) cover is established movable screw rod (42) are last, and one end acts on splint (33), the other end acts on angle steel (41).
4. The hot-metal bottle heat-insulating cover uncovering device as claimed in claim 2, wherein the heat-insulating cover body (1) comprises:
the cover plate (11), the cover plate (11) is semicircular, and the radius of the cover plate (11) is 150-200 mm larger than that of the hot-metal ladle;
the high-temperature-resistant fiber felt (12) is fixedly arranged on the lower surface of the cover plate (11);
the enclosing plate (13) surrounds the arc-shaped edge of the cover plate (11), and the fixing plate (31) is arranged on the enclosing plate (13).
5. The hot-metal bottle insulation cover uncovering device according to claim 4, wherein the bottom end of the high-temperature-resistant fiber felt (12) is higher than the top end of the hot-metal bottle opening in a state that the insulation cover body (1) covers the hot-metal bottle opening.
6. The hot-metal bottle insulation cover tamper device according to claim 4, wherein the insulation cover tamper device further comprises:
an alignment compensation device (5), the alignment compensation device (5) comprising:
a corner plate (51), wherein the corner plate (51) is arranged on one cover plate (11);
an external corner (52), the external corner (52) being provided on the gusset (51);
an internal corner (53), the internal corner (53) being provided on the other cover plate (11) to be engaged with the external corner (52).
7. The hot-metal bottle heat-insulating cover uncovering device as claimed in claim 1, wherein the transmission frame (2) comprises:
the hot metal ladle car comprises two rotating rods (21), wherein each of the two rotating rods (21) comprises a first rod (211), a second rod (212) and a third rod (213) which are vertically connected in sequence, one end, far away from the second rod (212), of the first rod (211) is connected with the heat-insulating cover body (1), and one end, far away from the second rod (212), of the third rod (213) is rotatably arranged on a hot metal ladle car frame;
and two ends of the connecting rod (22) are respectively connected with the two second rods (212).
8. The hot-metal bottle insulation cover uncovering device according to claim 7, wherein the third rod (213) is rotatably arranged on the hot-metal bottle frame through a driving mechanism (6), and the driving mechanism (6) comprises:
the mounting seat (61), the mounting seat (61) is arranged on the hot metal ladle frame;
the motor speed reducer (62), the motor speed reducer (62) is arranged on the mounting seat (61);
the transmission shaft, the one end of transmission shaft with motor reducer (62) key-type connection, the other end of transmission shaft passes through the rolling bearing and rotates the setting and be in on mount pad (61), pole three (213) set up rotate along with it on the transmission shaft.
9. The hot-metal bottle heat-insulating cover uncovering device as claimed in claim 2, wherein the sealing cloth (32) is made of a temperature-resistant elastic material, and the clamping plate (33) is made of a plastic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120549113.2U CN214684245U (en) | 2021-03-17 | 2021-03-17 | Hot metal bottle heat preservation lid adds takes off device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120549113.2U CN214684245U (en) | 2021-03-17 | 2021-03-17 | Hot metal bottle heat preservation lid adds takes off device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214684245U true CN214684245U (en) | 2021-11-12 |
Family
ID=78570502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120549113.2U Active CN214684245U (en) | 2021-03-17 | 2021-03-17 | Hot metal bottle heat preservation lid adds takes off device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214684245U (en) |
-
2021
- 2021-03-17 CN CN202120549113.2U patent/CN214684245U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201361707Y (en) | Counter-thrusting type vessel automatic capping device and vessel cap and tightening device thereof | |
| CN103949626B (en) | Opposite opened hot-metal bottle cover device and method for opening and closing thereof | |
| CN101486088A (en) | Hot-metal bottle combined cover and method thereof for adding and lifting cover | |
| CN214684245U (en) | Hot metal bottle heat preservation lid adds takes off device | |
| CN202479488U (en) | Molten iron heat insulation vehicle | |
| CN215144653U (en) | Ladle covering and uncovering device | |
| CN207057610U (en) | A kind of tundish exit port control device | |
| CN201760587U (en) | Ladle covering technique suitable for various refining outside furnace | |
| CN108746576A (en) | Molten iron bassinet structure | |
| CN214735880U (en) | Converter slag stopping composite sliding plate device | |
| CN203778752U (en) | Bi-opening type molten iron tank cover device | |
| CN213350793U (en) | Hot metal bottle capping device convenient to disassemble | |
| CN218362057U (en) | Lifting structure type multi-stage sealing device for ladle capping | |
| CN208929204U (en) | A kind of molten iron bassinet structure | |
| CN2218043Y (en) | Covering machine for revolving platform ladle of continuous caster | |
| CN218693840U (en) | Insulating cover of molten iron tank car | |
| CN216540818U (en) | Automatic cover turning device for ladle | |
| CN202527697U (en) | Stokehole ladle-casting transferring device used for dual induction furnaces | |
| CN220515410U (en) | Hot-metal bottle lid structure capable of reducing heat dissipation | |
| CN211304761U (en) | Rotary cover opening device | |
| CN209112308U (en) | A kind of steel billet heat insulating transport vehicle | |
| CN110849158A (en) | Energy-saving induction furnace body | |
| CN2141548Y (en) | Gate mechanism for industry furnace | |
| CN210458286U (en) | Trolley furnace for heat treatment | |
| CN219233938U (en) | Kiln car for mould shell roasting furnace in precision casting industry |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |