CN214321804U - Ladle cover hangers, ladle cover and ladle - Google Patents
Ladle cover hangers, ladle cover and ladle Download PDFInfo
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- CN214321804U CN214321804U CN202120004971.9U CN202120004971U CN214321804U CN 214321804 U CN214321804 U CN 214321804U CN 202120004971 U CN202120004971 U CN 202120004971U CN 214321804 U CN214321804 U CN 214321804U
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- eccentric device
- ladle cover
- groove
- bottom plate
- ladle
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Abstract
The utility model discloses a ladle cover hangers, a ladle cover and a ladle, which relates to the field of metallurgical equipment, wherein the ladle cover hangers comprise a bottom plate, an eccentric device and a lock pin, one end of the bottom plate, which is used for being fixedly connected with a ladle cover body, is a fixed end, the eccentric device is rotationally connected with the bottom plate, and the rotation axis of the eccentric device is far away from the fixed end; a fixed rod hook groove is formed in the bottom plate, the fixed rod hook groove is formed in the bottom plate between the rotating shaft and the fixed end of the eccentric device, and the fixed rod hook groove is used for hooking a fixed rod of the steel ladle cover; the lockpin sets up the one end of keeping away from the eccentric device pivot at eccentric device, and eccentric device is connected with the lockpin, and eccentric device rotation in-process can drive the lockpin and get into and leave dead lever catching groove, can restrict ladle cover dead lever in dead lever catching groove when the lockpin gets into dead lever catching groove. The steel ladle cover hangers, the steel ladle cover and the steel ladle can improve the reliability of locking the steel ladle cover and the steel ladle.
Description
Technical Field
The utility model relates to a metallurgical equipment field, concretely relates to ladle cover hangers, ladle cover and ladle.
Background
The steel ladle used in the smelting process flow of the steel plant has large heat loss at the upper opening in the flowing process, and the smoke causes pollution to the environment. Therefore, a ladle cover is added to a ladle in part of steel plants, the process needs to frequently uncover/buckle the whole ladle cover, and the ladle cover is required to be driven by the ladle body to pour molten iron/molten steel, so that the connection mode between the ladle cover and the ladle body has higher requirements, the ladle cover and the ladle body are frequently separated in a hinged mode, the ladle cover can be reliably hinged and locked in the pouring process and cannot be dropped, the reliability of the locking mode between the existing ladle cover and the ladle is low, and the ladle cover is easy to drop when the ladle cover is driven by the ladle body to pour molten iron/molten steel, so that potential safety hazards exist.
Disclosure of Invention
The utility model aims at providing a ladle cover hangers, ladle cover and ladle to solve the problem that above-mentioned prior art exists, can improve the reliability of ladle cover and ladle locking.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a steel ladle cover hanging lug, which comprises a bottom plate, an eccentric device and a lock pin, wherein one end of the bottom plate, which is fixedly connected with a steel ladle cover body, is a fixed end, the eccentric device is rotatably connected with the bottom plate, and the rotation axis of the eccentric device is far away from the fixed end; a fixed rod hook groove is formed in the bottom plate, is formed in the bottom plate between the rotating shaft of the eccentric device and the fixed end and is used for hooking a fixed rod of the steel ladle cover; the steel ladle cover fixing rod fixing device comprises an eccentric device, a fixing rod hook groove, a locking pin, an eccentric device and a fixing rod hook groove, wherein the locking pin is arranged at one end of the eccentric device, which is far away from a rotating shaft of the eccentric device, the eccentric device is connected with the locking pin, the locking pin can be driven to enter and leave the fixing rod hook groove in the rotating process of the eccentric device, and the steel ladle cover fixing rod can be limited in the fixing rod hook groove when the locking pin enters the fixing rod hook groove.
Preferably, the lock pin is provided with a connecting hole, one end of the eccentric device, which is far away from the rotating axis, is inserted into the connecting hole, the part of the eccentric device, which is in contact with the connecting hole, is arc-shaped, and the eccentric device is in contact with the inner surface of the connecting hole when rotating to drive the lock pin to slide.
Preferably, the eccentric device further comprises a limiting mechanism, the limiting mechanism is arranged on the bottom plate and arranged on two sides of the eccentric device, and the limiting mechanism is used for limiting the rotation angle of the eccentric device.
Preferably, the fixing rod hooking groove is obliquely arranged, the bottom end of the fixing rod hooking groove is close to the fixing end, and the opening end of the fixing rod hooking groove is far away from the fixing end.
Preferably, the fixing rod hook groove is provided with a locking part, the locking part is arranged on one surface of the fixing rod hook groove close to the fixing end, and the locking part protrudes towards the inside of the fixing rod hook groove.
Preferably, the width of the opening end of the fixed rod hook groove is gradually increased from the locking part to the opening of the fixed rod hook groove.
Preferably, the bottom plate is horizontally arranged, and when the fixed rod hooking groove faces downwards, the bottom plate at one side, far away from the fixed end, of the open end of the fixed rod hooking groove is higher than the bottom plate at one side, close to the fixed end, of the fixed rod hooking groove.
Preferably, the fixing device further comprises an eccentric device groove, the eccentric device groove is arranged on the bottom plate, and the eccentric device groove is arranged on one side, far away from the fixing end, of the fixing rod hook groove; the eccentric device is arranged in the eccentric device groove, the limiting mechanism comprises two limiting ribs, the two limiting ribs are positioned in the eccentric device groove and are respectively arranged on two sides of the eccentric device, and the limiting ribs are used for limiting the eccentric device to continuously rotate when contacting with the eccentric device; the eccentric device is characterized in that a lock pin sliding groove is formed in the bottom of the eccentric device groove, the lock pin is arranged in the lock pin sliding groove, the lock pin sliding groove is communicated with the eccentric device groove and the fixed rod hooking groove, the lock pin sliding groove and the fixed rod hooking groove are arranged in an angled mode, and the lock pin sliding groove is used for guiding the lock pin to move.
The utility model also provides a steel ladle cover, including steel ladle cover body and foretell steel ladle cover hangers, the steel ladle cover hangers the stiff end with steel ladle cover body fixed connection.
The utility model also provides a steel ladle, including the ladle body and foretell ladle cover, the ladle cover is used for sealing the open-top of the ladle body.
The utility model discloses for prior art gain following technological effect:
the utility model provides a steel ladle cover hangers, a steel ladle cover and a steel ladle, which can automatically remove the limit of a lock pin on a steel ladle cover fixing rod when the steel ladle cover and the steel ladle need to be separated, so that the steel ladle cover can be smoothly taken down; the locking pin can be automatically used for limiting the steel ladle cover fixing rod in the process of pouring the steel ladle, and the steel ladle cover and the steel ladle are prevented from falling off in the pouring process. In the process of limiting and releasing the limit of the steel ladle cover fixing cover by the lock pin, the eccentric device is connected with the lock pin, so that the eccentric device can provide power for the movement of the lock pin in the process of enabling the lock pin to enter and exit the fixing rod hook groove, the lock pin can work smoothly, the clamping stagnation condition caused by light weight of the lock pin is prevented, the condition of limit failure of the lock pin is prevented, and the reliability of a steel ladle cover hanging lug is improved.
Further, the horn mouth characteristic that dead lever collude groove opening part crescent and the bottom plate length of dead lever collude groove open end both sides are inconsistent, are favorable to the ladle cover dead lever to get into the dead lever collude groove, improve the convenience that the ladle cover covers the ladle, and the slope in dead lever collude groove is provided with and does benefit to the ladle cover dead lever and breaks away from the dead lever collude groove, makes the ladle remove the ladle cover and change in the operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a steel ladle cover hanger in a horizontal arrangement in the first embodiment;
fig. 2 is a schematic structural view of a steel ladle cover hanger in the first embodiment when the steel ladle cover hanger is vertically arranged;
FIG. 3 is a schematic view showing a structure of the second embodiment in which the ladle cover is horizontally placed in cooperation with the ladle;
fig. 4 is a schematic structural view of the ladle cover in the second embodiment in cooperation with the ladle when the ladle cover is vertically placed.
Wherein: 1-an eccentric device shaft; 2-an eccentric device; 3-a lock pin; 4-a bottom plate; 5-a lock pin chute; 6-eccentric center of gravity; 7-covering the fixed rod with the steel ladle; 8-hanging lugs on the steel ladle cover; 9-steel ladle cover body; 10-fixing rod hooking grooves; 11-a locking part; 12-a fixed end; 13-ladle cover; 14-a ladle body; 15-connecting holes; 16 eccentric device slots; 17-limiting ribs.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, 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.
The utility model aims at providing a ladle cover hangers, ladle cover and ladle to solve the problem that above-mentioned prior art exists, can improve the reliability of ladle cover and ladle locking.
Example one
The embodiment provides a steel ladle cover hanging lug 8, which comprises a bottom plate 4, an eccentric device 2 and a lock pin 3, wherein one end of the bottom plate 4, which is fixedly connected with a steel ladle cover body 9, is a fixed end, the eccentric device 2 is rotatably connected with the bottom plate 4, and the rotating axis of the eccentric device 2 is far away from the fixed end; a fixed rod hook groove is formed in the bottom plate 4, a fixed rod hook groove 10 is formed in the bottom plate 4 between the rotating shaft 1 and the fixed end 12 of the eccentric device, and the fixed rod hook groove 10 is used for hooking the steel ladle cover fixed rod 7; the lockpin 3 is arranged at one end, far away from the eccentric device rotating shaft 1, of the eccentric device 2, the eccentric device 2 is connected with the lockpin 3, the lockpin 3 can be driven to enter and leave the fixed rod hooking groove 10 in the rotating process of the eccentric device 2, and the steel ladle cover fixed rod 7 can be limited in the fixed rod hooking groove 10 when the lockpin 3 enters the fixed rod hooking groove 10. In the process of covering the ladle cover 13 on the ladle body 14, the ladle cover fixing rod 7 enters the fixing rod hooking groove 10, and the ladle cover fixing rod 7 limits the ladle cover 13 at the moment, so that the ladle cover 13 cannot move horizontally. When the ladle emptys, ladle cover 13 receives the effect of gravity and begins to slide to the one end of keeping away from ladle cover hangers 8, ladle cover dead lever 7 and dead lever groove 10 keep away from a face contact of stiff end 12 this moment, ladle cover 13 is hung on ladle cover dead lever 7, eccentric device 2 receives the effect of gravity simultaneously, begin to rotate, eccentric device 2 keeps away from the one end of rotation axis and is connected with lockpin 3, eccentric device 2's rotation drives the removal of lockpin 3, lockpin 3 gets into and restricts ladle cover dead lever 7 in the dead lever groove 10, prevent that ladle cover dead lever 7 from deviating from the open end of dead lever groove 10, thereby realize the in-process ladle cover 13 that emptys at the ladle and be connected with the ladle, do not fall the lid. When the ladle cover 13 needs to be taken down when the ladle is horizontally placed, the eccentric device 2 is acted by gravity downwards and tends to rotate, namely the lock pin 3 can be driven by the eccentric device 2 to leave the fixed rod hook groove 10, the limit on the ladle cover fixed rod 7 is removed, the ladle cover fixed rod 7 can be smoothly separated from the fixed rod hook groove 10, and therefore the ladle cover 13 can be smoothly separated from the ladle. In the process that the lock pin 3 limits and relieves the limit on the steel ladle cover fixing rod 7, the movement of the lock pin 3 is driven by the eccentric device 2, the defects that the lock pin 3 is insufficient in self gravity and cannot drive the lock pin 3 to move are avoided, the reliability of the steel ladle cover hanging lug 8 is improved, and meanwhile, the safety is also improved.
In the embodiment, the lock pin 3 is provided with a connecting hole 15, one end of the eccentric device 2, which is far away from the rotation axis, is inserted into the connecting hole 15, the part of the eccentric device 2, which is contacted with the connecting hole 15, is arc-shaped, and the eccentric device 2 is contacted with the inner surface of the connecting hole 15 when rotating to drive the lock pin 3 to slide. The eccentric device 2 is directly matched with the lock pin 3, the arc surface structure of the eccentric device 2 can slide and rotate in the connecting hole 15 of the lock pin 3, the lock pin 3 is driven by the gravity of the eccentric device 2 and the gravity of the lock pin 3 in the process of pouring the ladle body 14, the eccentric device 2 rotates, an additional mechanism and an additional driving device are not needed, the structure of the steel ladle cover hanging lug 8 is simplified, and the reliability is further improved.
The center of gravity of the eccentric 2 is disposed between the eccentric shaft 1 and the fixed end 12. The eccentric device 2 is directly inserted into the connecting hole 15, the part of the eccentric device 2 inserted into the connecting hole 15 comprises an arc-shaped surface, the arc-shaped surface is matched with the inner surface of the connecting hole 15, the gravity borne by the eccentric device 2 is transferred to the lock pin 3 through the contact of the eccentric device 2 and the connecting hole 15, and the lock pin 3 is driven to enable the lock pin 3 to enter or leave the fixed rod hook groove 10. The eccentric device 2 is directly connected with the connecting hole 15 of the lock pin 3, so that the lock pin 3 enters the process that the fixed rod hook groove 10 limits the steel ladle cover fixed rod 7 and the lock pin 3 exits the fixed rod hook groove 10 to relieve the limitation on the steel ladle cover fixed rod 7, the eccentric device 2 is inserted into the connecting hole 15 of the lock pin 3, the eccentric device 2 can provide power for the movement of the lock pin 3 in the process that the lock pin 3 enters and exits the fixed rod hook groove 10, the lock pin 3 can be effectively prevented from being blocked due to insufficient gravity, the failure condition is realized, and the reliability of the steel ladle cover hanging lug 8 is further improved.
The embodiment also comprises a limiting mechanism, the limiting mechanism is arranged on the bottom plate 4 and arranged on two sides of the eccentric device 2, and the limiting mechanism is used for limiting the rotation angle of the eccentric device 2. The limiting mechanism can effectively prevent the eccentric device 2 from impacting the lock pin 3 when the rotation is stopped when the rotation angle is too large, so that the lock pin 3 is prevented from being damaged due to the impact, and the reliability of the steel ladle cover hanging lug 8 is improved.
In this embodiment, the fixing rod hooking groove 10 is obliquely disposed, the bottom end of the fixing rod hooking groove 10 is close to the fixing end 12, and the opening end of the fixing rod hooking groove 10 is far away from the fixing end 12. The moving direction of the ladle cover 13 is consistent in the process that the obliquely arranged fixed rod hook groove 10 and the interdigital fork pick and place the ladle cover 13, and the ladle cover 13 and a ladle can be opened and buckled conveniently.
When the ladle cover hangers 8 are horizontally placed and the fixing rod hook grooves 10 are downward opened, the inclination angle of the fixing rod hook grooves 10 can be set to be an included angle of 3-9 degrees with the vertical direction.
The embodiment further comprises a locking part 11, the locking part 11 is arranged on one surface of the fixed rod hooking groove 10 close to the fixed end 12, and the locking part 11 protrudes towards the inside of the fixed rod hooking groove 10. Due to the arrangement, the width of the groove body at the position of the locking part 11 in the fixed rod hooking groove 10 is narrow, when the ladle body 14 is inclined, the angle deflection is small, and the limit on the ladle cover fixed rod 7 can be realized when the size of the lock pin 3 entering the fixed rod hooking groove 10 is short. At the moment, the ladle cover fixing rod 7 is not separated, the ladle cover fixing rod 7 is pushed in advance for limitation, and the reliability and the safety of the ladle cover hanging lug 8 can be improved.
The size of the opposite surface of the locking part 11 and the fixed rod hooking groove 10 can be set according to the diameter of the ladle cover fixed rod 7, and the size is 5 mm-15 mm larger than the diameter of the ladle cover fixed rod 7.
The width self-locking part 11 of dead lever collude groove 10 open end is crescent to dead lever collude groove 10 opening part in this embodiment, forms a horn mouth, is favorable to ladle cover dead lever 7 to enter into dead lever collude groove 10 in, is favorable to the lock of ladle cover 13 and ladle.
In this embodiment, the bottom plate 4 is horizontally disposed, and when the fixing rod hooking groove 10 faces downward, the bottom plate 4 at the side of the opening end of the fixing rod hooking groove 10 far away from the fixing end 12 is higher than the bottom plate 4 at the side close to the fixing end 12. One side that bottom plate 4 of ladle cover hangers 8 is short is close to with ladle cover dead lever 7 earlier, then ladle cover 13 continues to move, and ladle cover dead lever 7 is blocked to the long one end of bottom plate 4 of ladle cover hangers 8, makes ladle cover dead lever 7 slide into dead lever catching groove 10 along bottom plate 4, is favorable to ladle cover dead lever 7 to enter into dead lever catching groove 10 in, is favorable to the lock of ladle cover 13 and ladle, improves the operation convenience of ladle cover 13 and ladle lock.
The height difference of the bottom plate 4 at the opening end of the fixed rod hook groove 10 is set between 50mm and 125 mm.
The embodiment also comprises an eccentric device groove 16, wherein the eccentric device groove 16 is arranged on the bottom plate 4, and the eccentric device groove 16 is arranged on one side of the fixed rod hook groove 10 far away from the fixed end 12; the eccentric device 2 is arranged in the eccentric device groove 16, the limiting mechanism comprises two limiting ribs 17, the two limiting ribs 17 are positioned in the eccentric device groove 16, the limiting ribs 17 are arranged on two sides of the eccentric device 2, and the limiting ribs 17 are used for limiting the rotating range of the eccentric device 2; the bottom of the eccentric device groove 16 is provided with a lock pin sliding groove 5, the lock pin 3 is arranged in the lock pin sliding groove 5, the lock pin sliding groove 5 is communicated with the eccentric device groove 16 and the fixed rod hooking groove 10, the lock pin sliding groove 5 and the fixed rod hooking groove 10 are arranged in an angled mode, and the lock pin sliding groove 5 is used for guiding the lock pin 3 to move. The eccentric device groove 16 is arranged to reduce the weight of the bottom plate 4, the eccentric device 2 is limited by the shape of the eccentric device groove 16, the lock pin sliding groove 5 is also directly arranged at the bottom of the eccentric device groove 16, the limiting device and the lock pin sliding groove 5 do not need to be additionally arranged, and the weight of the bottom plate 4 is further reduced.
Example two
This embodiment provides a ladle cover 13, including ladle cover body 9 and ladle cover hangers 8 in the embodiment one, ladle cover hangers 8 and ladle cover body 9 fixed connection. The ladle cover 13 can automatically prevent the ladle cover 13 from falling off from the ladle body 14 according to the rotating inclination angle of the ladle body 14, and the ladle cover 13 can be automatically released from the ladle body 14, so that the ladle cover 13 can be easily opened.
EXAMPLE III
The embodiment provides a ladle, which comprises a ladle body 14 and a ladle cover 13 in the third embodiment, wherein the ladle cover 13 is used for closing the ladle body 14. The ladle cover 13 and the ladle body 14 can be automatically prevented from falling off according to the rotating and tilting angle of the ladle, and the ladle cover 13 can be automatically released from the ladle body 14, so that the ladle cover 13 can be easily uncovered.
The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. The utility model provides a ladle cover hangers which characterized in that: the steel ladle cover comprises a bottom plate, an eccentric device and a lock pin, wherein one end of the bottom plate, which is fixedly connected with a steel ladle cover body, is a fixed end, the eccentric device is rotatably connected with the bottom plate, and a rotating axis of the eccentric device is far away from the fixed end; a fixed rod hook groove is formed in the bottom plate, is formed in the bottom plate between the rotating shaft of the eccentric device and the fixed end and is used for hooking a fixed rod of the steel ladle cover; the steel ladle cover fixing rod fixing device comprises an eccentric device, a fixing rod hook groove, a locking pin, an eccentric device and a fixing rod hook groove, wherein the locking pin is arranged at one end of the eccentric device, which is far away from a rotating shaft of the eccentric device, the eccentric device is connected with the locking pin, the locking pin can be driven to enter and leave the fixing rod hook groove in the rotating process of the eccentric device, and the steel ladle cover fixing rod can be limited in the fixing rod hook groove when the locking pin enters the fixing rod hook groove.
2. The ladle cover lug as recited in claim 1, characterized in that: the locking pin is provided with a connecting hole, one end of the eccentric device, which is far away from the rotating axis, is inserted into the connecting hole, the part of the eccentric device, which is contacted with the connecting hole, is arc-shaped, and the eccentric device is contacted with the inner surface of the connecting hole when rotating to drive the locking pin to slide.
3. The ladle cover lug as recited in claim 1, characterized in that: the eccentric device is characterized by further comprising a limiting mechanism, the limiting mechanism is arranged on the bottom plate, the limiting mechanism is arranged on two sides of the eccentric device, and the limiting mechanism is used for limiting the rotating angle of the eccentric device.
4. The ladle cover lug as recited in claim 1, characterized in that: the fixed rod hook groove is obliquely arranged, the bottom end of the fixed rod hook groove is close to the fixed end, and the open end of the fixed rod hook groove is far away from the fixed end.
5. The ladle cover lug as recited in claim 1, characterized in that: the fixing rod hook groove is arranged on the fixed end, and the fixing rod hook groove is arranged on the fixed end.
6. The ladle cover lug as recited in claim 5, characterized in that: the width of the opening end of the fixed rod hook groove is gradually increased from the locking part to the opening of the fixed rod hook groove.
7. The ladle cover lug as recited in claim 1, characterized in that: the bottom plate is horizontally placed, when the fixed rod hook groove faces downwards, the open end of the fixed rod hook groove is far away from the bottom plate on one side of the fixed end and is higher than the bottom plate on one side of the fixed end.
8. The ladle cover lug as recited in claim 3, characterized in that: the eccentric device groove is arranged on the bottom plate and is arranged on one side, away from the fixed end, of the fixed rod hook groove; the eccentric device is arranged in the eccentric device groove, the limiting mechanism comprises two limiting ribs, the two limiting ribs are positioned in the eccentric device groove and are respectively arranged on two sides of the eccentric device, and the limiting ribs are used for limiting the eccentric device to continuously rotate when contacting with the eccentric device; the eccentric device is characterized in that a lock pin sliding groove is formed in the bottom of the eccentric device groove, the lock pin is arranged in the lock pin sliding groove, the lock pin sliding groove is communicated with the eccentric device groove and the fixed rod hooking groove, the lock pin sliding groove and the fixed rod hooking groove are arranged in an angled mode, and the lock pin sliding groove is used for guiding the lock pin to move.
9. A ladle cover is characterized in that: the steel ladle cover hanging lug comprises a steel ladle cover body and the steel ladle cover hanging lug as claimed in any one of claims 1 to 8, wherein the fixed end of the steel ladle cover hanging lug is fixedly connected with the steel ladle cover body.
10. A ladle, characterized by: comprising a ladle body and a ladle cover according to claim 9 for closing a top opening of the ladle body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120004971.9U CN214321804U (en) | 2021-01-04 | 2021-01-04 | Ladle cover hangers, ladle cover and ladle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120004971.9U CN214321804U (en) | 2021-01-04 | 2021-01-04 | Ladle cover hangers, ladle cover and ladle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214321804U true CN214321804U (en) | 2021-10-01 |
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ID=77904798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120004971.9U Active CN214321804U (en) | 2021-01-04 | 2021-01-04 | Ladle cover hangers, ladle cover and ladle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214321804U (en) |
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2021
- 2021-01-04 CN CN202120004971.9U patent/CN214321804U/en active Active
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