CN219121086U - Box graphitization furnace feeding device and box graphitization furnace system - Google Patents
Box graphitization furnace feeding device and box graphitization furnace system Download PDFInfo
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- CN219121086U CN219121086U CN202223589099.2U CN202223589099U CN219121086U CN 219121086 U CN219121086 U CN 219121086U CN 202223589099 U CN202223589099 U CN 202223589099U CN 219121086 U CN219121086 U CN 219121086U
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Abstract
The utility model discloses a box-type graphitizing furnace feeding device and a box-type graphitizing furnace system, comprising a feeding platform and a plurality of feeding hoppers, wherein the feeding platform can move in the up-down direction and in the horizontal direction, the upper surface of the feeding platform is used for powder feeding and placement, the upper surface of the feeding platform is provided with a plurality of through holes, the plurality of feeding hoppers are uniformly distributed in the horizontal direction, the top end of each feeding hopper is provided with a feeding port, the bottom end of each feeding hopper is provided with a discharging port, and the feeding ports of the feeding hoppers can be communicated with the corresponding through holes. According to the technical scheme, the plurality of material conveying hoppers of the feeding device are placed in one-to-one correspondence with the hoppers of the material boxes, the negative powder ton bags are hung above the feeding platform, the hanging ropes at the bottoms of the ton bags are loosened, the negative powder is filled into the hoppers, the vibrating bars are used for vibrating the negative powder, the feeding platform moves upwards until the negative powder is filled into the hoppers, the feeding is rapid, the consumption is low, the operation environment is improved, and the service life of the material boxes is prolonged.
Description
Technical Field
The utility model relates to the technical field of box-type graphitizing furnace feeding, in particular to a box-type graphitizing furnace feeding device and a box-type graphitizing furnace system.
Background
When the 0-box furnace is charged, a crane is generally adopted to hoist the ton package filled with the anode material to the furnace body
And a person stands above the box plate to unwind the binding rope at the bottom of the ton bag or scratch the bottom of the ton bag by a cutter, so that the powdery negative electrode material flows into the nine Gong Gexiang bodies.
However, the travelling crane generally can only hoist one ton package to move back and forth to throw materials to the nine-grid box body one by one, the feeding speed is low, the production efficiency is low, and the cathode material is easy to be thrown outside the box body, so that the material loss is caused. 5 because the negative electrode material has small specific gravity, good fluidity and extremely easy drifting, the depth of the box body of the box-type furnace is usually more than 2.5m and is close to 3m, the fall of the material flowing into the box body from the bottom of the ton bag is large, the negative electrode material flies around during actual charging, the loss is large, and the operation environment is poor. In addition, operating personnel directly operate at the box top, cause the box to damage easily, influence box life, and the damaged graphite bits or the graphite powder that produces of box
Can lead to the occurrence of particle foreign matters in the anode material, can also easily lead to the occurrence of cracks at the joint of the box body, and can leak outside the furnace to cause material loss through the cracks of the box body in the graphitization 0 process, and the product is collected
The rate is reduced, and the insulation outside the furnace (particle size of millimeter) can also permeate into the anode material (average particle size of 5-25 um) through the cracks of the box body, so that the anode material is polluted.
Disclosure of Invention
The utility model aims to provide a box-type graphitizing furnace feeding device, and aims to provide a box-type graphitizing furnace feeding device for assisting feeding.
In order to achieve the above purpose, the box-type graphitizing furnace feeding device provided by the utility model comprises:
the feeding platform can move up and down and move in the horizontal direction, and is flat
The upper surface of the table is used for powder placement, and a plurality of through holes are formed in the upper surface of the feeding platform; and 0 plurality of material conveying hoppers are uniformly distributed in the horizontal direction, the top ends of the material conveying hoppers are provided with material feeding ports, the bottom ends of the material conveying hoppers are provided with material discharging ports, and the material feeding ports of the material conveying hoppers can be communicated with the corresponding through holes.
Preferably, the box-type graphitizing furnace feeding device further comprises a plurality of beam brackets, wherein the beam brackets are arranged on two sides of the feeding platform along the length direction and positioned below the feeding platform to support the feeding platform.
Preferably, the beam support comprises a support beam and a base plate connected to the bottom of the support beam, the support beam is arranged on two sides of the feeding platform along the length direction and positioned below the feeding platform, the support beam extends downwards, and the distance between the base plate and the lower surface of the feeding platform is H, wherein H is more than or equal to 10 and less than or equal to 40cm.
Preferably, the end face of each feeding port is flush with the upper surface of the feeding platform; or alternatively, the process may be performed,
the end face of each feeding port is lower than the upper surface of the feeding platform.
Preferably, the box graphitizing furnace feeding device further comprises a plurality of hanging rings, the hanging rings are arranged at intervals along the circumferential direction of the feeding platform and are positioned above the feeding platform, and the hanging rings are used for being connected with lifting equipment.
Preferably, the feeding platform comprises a plurality of cross beams and a plurality of longitudinal beams, and each cross beam and each longitudinal beam overlap each other to jointly define a plurality of through holes.
Preferably, the feeding platform comprises:
a platform body;
the two main coamings are arranged on two sides of the feeding platform along the length direction and above the feeding platform, and each main coaming and the feeding platform form an included angle;
the side coamings are arranged on two sides of the feeding platform in the width direction and above the feeding platform, and each side coaming and the feeding platform form an included angle; the method comprises the steps of,
four joint plates, two ends of each joint plate are connected with the adjacent main coaming plate and the adjacent side coaming plate;
the platform comprises a platform body, two main coamings, two side coamings and four connecting plates, wherein the platform body, the two main coamings, the two side coamings and the four connecting plates jointly enclose to form an accommodating space, and the sectional area of the accommodating space is gradually increased from bottom to top.
Preferably, the box-type graphitizing furnace feeding device comprises a plurality of hopper groups which are arranged at intervals along the length direction of the feeding platform, and each hopper group comprises a plurality of conveying hoppers which are arranged at intervals along the width direction of the feeding platform.
The utility model also provides a box-type graphitizing furnace system, which comprises a box-type graphitizing furnace feeding device and a feed box, wherein the feed box is provided with a plurality of hoppers corresponding to the plurality of conveying hoppers, and each hopper is used for receiving powder conveyed by each conveying hopper;
the feeding device of the box-type graphitizing furnace comprises a feeding platform, wherein the feeding platform can move in the up-down direction and in the horizontal direction, the upper surface of the feeding platform is used for powder placement, and a plurality of through holes are formed in the upper surface of the feeding platform; the method comprises the steps of,
the plurality of conveying hoppers are uniformly distributed in the horizontal direction, the top ends of the conveying hoppers are provided with feeding ports, the bottom ends of the conveying hoppers are provided with discharging ports, and the feeding ports of the conveying hoppers can be communicated with the corresponding through holes.
Preferably, the width of the feeding platform is L1, and the width of the feed box is L2, wherein L1 is more than L2.
According to the technical scheme, the charging platform is arranged above the feed boxes, the plurality of feed hoppers are arranged in one-to-one correspondence with the feed hoppers of the feed boxes, the negative powder ton bags are lifted to the upper portion of the charging platform by the lifting equipment, the lifting ropes at the bottoms of the ton bags are loosened, the negative powder is filled into the feed hoppers of the feed boxes through the plurality of feed hoppers, the negative powder in the feed hoppers is compacted by the vibrating rods, the charging platform is moved upwards until the negative powder is filled into the feed hoppers, the negative powder at the upper portion in the feed boxes is compacted by the vibrating rods continuously, the charging speed is high, the negative powder consumption is reduced, the operation environment is improved, the box body of the feed boxes is prevented from being broken, and the service life of the box body is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of an embodiment of a charging device of a box-type graphitizing furnace according to the present utility model;
FIG. 2 is an enlarged schematic view of a portion of FIG. 1 at A;
FIG. 3 is a schematic plan view of an embodiment of the box-type graphitizing furnace system of the present utility model.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
When the box-type furnace is charged, a crane is generally adopted to hoist the ton package filled with the negative electrode material above the furnace body, a person stands above the box plate to untwist the binding rope at the bottom of the ton package or to scratch the bottom of the ton package by a cutter, so that the powdery negative electrode material flows into the nine Gong Gexiang bodies.
However, the travelling crane generally can only hoist one ton package to move back and forth to throw materials to the nine-grid box body one by one, the feeding speed is low, the production efficiency is low, and the cathode material is easy to be thrown outside the box body, so that the material loss is caused. Because the negative electrode material has small specific gravity and good fluidity, the negative electrode material is extremely easy to drift, the depth of the box body of the box-type furnace is usually more than 2.5m and is close to 3m, the fall of the material flowing into the box body from the bottom of the ton bag is large, the negative electrode material flies around during actual charging, the loss is large, and the operation environment is poor. In addition, operating personnel directly work at the box top, cause the box to damage easily, influence box life, and the graphite bits or the graphite powder that the box damage produced can cause the particulate matter to appear in the negative pole material, still cause the box concatenation department to appear the crack easily, the negative pole material can leak to the stove outside through the box crack under high temperature in the graphitization process and cause the material loss, the product yield reduces, and the insulation material (granule particle diameter is at millimeter level) outside the stove also can permeate to the negative pole material (granule average particle diameter is usually between 5-25 um) through the box crack, cause the negative pole material to be polluted.
In order to solve the above problems, the present utility model provides a box-type graphitizing furnace feeding device, which aims to provide a box-type graphitizing furnace feeding device for assisting feeding, fig. 1 to fig. 2 are schematic perspective views of an embodiment provided by the box-type graphitizing furnace feeding device of the present utility model, and fig. 3 is a schematic plan view of an embodiment provided by the box-type graphitizing furnace system of the present utility model.
Referring to fig. 1 to 2, the utility model provides a box-type graphitizing furnace feeding device 100, which comprises a feeding platform 1 and a plurality of feeding hoppers 2, wherein the feeding platform 1 can move up and down and can move in a horizontal direction, the upper surface of the feeding platform 1 is used for powder placement, the upper surface of the feeding platform 1 is provided with a plurality of through holes 12, the feeding hoppers 2 are uniformly distributed in the horizontal direction, the top end of each feeding hopper 2 is provided with a feeding port 22, the bottom end of each feeding hopper 2 is provided with a discharging port 21, and the feeding ports 22 of each feeding hopper 2 can be communicated with the corresponding through holes 12.
In the technical scheme of the utility model, the feeding platform 1 is arranged above the feed box 200, the hoppers 201 of the feed boxes 200 are in one-to-one correspondence with the plurality of feed hoppers 2, the negative powder ton bags are lifted to the upper part of the feeding platform 1 by using lifting equipment, the lifting ropes at the bottoms of the ton bags are loosened, the negative powder is filled into the hoppers 201 of the feed boxes 200 by using the plurality of feed hoppers 2, the negative powder in the hoppers 201 is compacted by using the vibrating bars, the feeding platform 1 is moved upwards until the negative powder is filled into the hoppers 201, and the negative powder at the upper part in the feed boxes 200 is continuously compacted by using the vibrating bars.
In order to improve the stability of the box-type graphitizing furnace feeding device 100 when in use, referring to fig. 1, in an embodiment of the present utility model, the box-type graphitizing furnace feeding device 100 further includes a plurality of beam supports 3, and the plurality of beam supports 3 are disposed on two sides of the feeding platform 1 along the length direction and are located below the feeding platform 1 to support the feeding platform 1. A plurality of beam brackets 3 fall on the heat preservation material layer 300 of the box body circumference side of the material box 200, can support the whole box-type graphitization furnace feeding device 100, and the beam brackets 3 are provided with a plurality of beam brackets so as to improve the stability of the box-type graphitization furnace feeding device 100 falling onto the heat preservation material layer 300.
Further, in an embodiment of the utility model, referring to fig. 2, the beam support 3 includes a support beam 31 and a pad plate 32 connected to the bottom of the support beam 31, the support beam 31 is disposed on two sides of the feeding platform 1 along the length direction and is located below the feeding platform 1, the support beam 31 extends downward, and the distance between the pad plate 32 and the lower surface of the feeding platform 1 is H, where H is greater than or equal to 10 and less than or equal to 40cm. The supporting beam 31 supports the box-type graphitizing furnace feeding device 100, the backing plate 32 is used for enlarging the contact area with the heat preservation material layer 300, so that the gravity of the box-type graphitizing furnace feeding device 100 is dispersed, and a distance is reserved between the backing plate 32 and the lower surface of the feeding platform 1, so that the box body is prevented from being crushed due to direct contact between the box-type graphitizing furnace feeding device 100 and the box body of the material box 200, and the service life of the material box 200 is prolonged.
In order to enable the powder to more smoothly enter the hopper 2 during feeding, in an embodiment of the present utility model, the end surface of each feeding port 22 is flush with the upper surface of the feeding platform 1, so that the powder can smoothly flow into each hopper 2, if the end surface of each feeding port 22 is higher than the upper surface of the feeding platform 1, resistance is generated to the powder flow, and the powder is easy to remain on the upper surface of the feeding platform; in another embodiment of the present utility model, the end surface of each feeding port 22 is lower than the upper surface of the feeding platform 1, so that the powder flows to each feeding hopper 2 more quickly and the resistance of the powder flowing can be reduced; it should be noted that the two technical features may be alternatively set, or may be set simultaneously; specifically, in this embodiment, the end surface of each feeding port 22 is lower than the upper surface of the feeding platform 1, so that powder can flow to the feeding hopper 2 quickly, and feeding efficiency is improved.
In order to facilitate moving the feeding device 100 of the box-type graphitizing furnace, referring to fig. 1, in an embodiment of the present utility model, the feeding device 100 of the box-type graphitizing furnace further includes a plurality of hanging rings 4, wherein the plurality of hanging rings 4 are disposed at intervals along the circumferential direction of the feeding platform 1 and are located above the feeding platform 1, and the plurality of hanging rings 4 are used for being connected with a lifting device. In the feeding process or when the feeding is completed, the lifting equipment can be connected with a plurality of lifting rings 4 to lift the box-type graphitizing furnace feeding device 100 to move up and down or in the horizontal direction, so that the convenience of the box-type graphitizing furnace feeding device 100 in use is improved.
In order to enhance the support of the feeding platform 1, referring to fig. 1, in an embodiment of the present utility model, the feeding platform 1 includes a plurality of cross beams 13 and a plurality of stringers 14, and each of the cross beams 13 and each of the stringers 14 overlap with each other to define a plurality of through holes 12. The cross beams 13 and the longitudinal beams 14 are overlapped with each other, so that the support stability of the feeding platform 1 period is enhanced, the bearing capacity is stronger, and the case body of the material box 200 is prevented from being damaged when the feeding platform 1 is manually stepped on for operation.
In order to facilitate the placement of the excessive powder above the feeding platform 1, in an embodiment of the present utility model, referring to fig. 1, the feeding platform 1 includes a platform body 11, two main coamings 15, two side coamings 16 and four connecting plates 17, the two main coamings 15 are disposed on two sides of the feeding platform 1 along the length direction and above the feeding platform 1, each main coamings 15 is disposed at an angle with the feeding platform 1, the two side coamings 16 are disposed on two sides of the feeding platform 1 along the width direction and above the feeding platform 1, each side coamings 16 is disposed at an angle with the feeding platform 1, and two ends of each connecting plate 17 are connected to the adjacent main coamings 15 and side coamings 16, wherein the platform body 11, the two main coamings 15, the two side coamings 16 and the four connecting plates 17 jointly enclose a receiving space, and the cross-sectional area of the receiving space is gradually increased from bottom to top. In the feeding process, the containing space is used for containing redundant powder, the sectional area of the containing space is gradually increased from bottom to top, so that not only can redundant powder be contained, but also powder ton bags can be contained, the powder ton bags are close to the feeding platform 1 and are lowered into the conveying hoppers 2, and the consumption of the powder is reduced.
The upper part of the conveying hopper 2 can be a cylinder or a cuboid, the lower part of the conveying hopper 2 can be a cuboid or an inverted trapezoid, the utility model is not limited to this, in the novel embodiment of the utility model, the upper part of the conveying hopper 2 is a cuboid, the lower part of the conveying hopper 2 is an inverted trapezoid, the feeding port 22 is communicated with the upper end part of the cuboid at the upper part of the conveying hopper 2, the discharging port 21 is communicated with the lower end part of the inverted trapezoid at the lower part of the discharging port, and because the powder has good fluidity and is easy to drift, the lower part of the conveying hopper 2 is arranged as the inverted trapezoid, the powder is not easy to tumble in the process of flowing to the hopper 201 of the material box 200, and the stirred powder can be blocked from rising to the upper plane of the feeding platform 1, so that the working environment of the feeding platform is improved.
In order to improve the feeding efficiency, referring to fig. 1, the feeding device 100 of the box-type graphitizing furnace includes a plurality of hopper groups spaced along the length direction of the feeding platform 1, and each of the hopper groups includes a plurality of feeding hoppers 2 spaced along the width direction of the feeding platform 1. The feeding platform 1 is provided with a plurality of feeding hoppers 2 in the length direction and the width direction, and powder flows into the hopper 201 of the feed box 200 through the plurality of feeding hoppers 2, so that the feeding speed is high, and the efficiency is high.
The utility model also provides a box-type graphitizing furnace system, which comprises a feed box 200 and a box-type graphitizing furnace feeding device 100, wherein the specific structure of the box-type graphitizing furnace feeding device 100 refers to the embodiment, and as the box-type graphitizing furnace system adopts all the technical schemes of all the embodiments, at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted.
In an embodiment of the present utility model, referring to fig. 1 and 3, the box-type graphitizing furnace system includes a box-type graphitizing furnace feeding device 100 and a material box 200, the box-type graphitizing furnace feeding device 100 includes a feeding platform 1 and a plurality of material sending hoppers 2, the feeding platform 1 can move up and down and can move in a horizontal direction, the upper surface of the feeding platform 1 is used for powder placement, the upper surface of the feeding platform 1 is provided with a plurality of through holes 12, the material sending hoppers 2 are uniformly distributed in the horizontal direction, the top end of each material sending hopper 2 is provided with a feeding hole 22, the bottom end of each material sending hopper 2 is provided with a discharging hole 21, the feeding hole 22 of each material sending hopper 2 can be connected with the corresponding through hole 12, the material box 200 is provided with a plurality of material sending hoppers 201 corresponding to the plurality of material sending hoppers 2, and each material sending hopper 201 is used for receiving the powder sent by each material sending hopper 2. The charging platform 1 is arranged above the material box 200, the material conveying hoppers 2 are in one-to-one correspondence, the material hoppers 201 are arranged, the lifting equipment for the negative powder ton bags is hung above the material conveying platform 1, the lifting ropes at the bottoms of the ton bags are loosened, the negative powder is filled into the material hoppers 201 through the material conveying hoppers 2, the negative powder in the material hoppers 201 is tamped by the vibrating rods, the material conveying platform 1 is moved upwards until the negative powder is filled into the material hoppers 201, the negative powder at the upper part in the material hoppers 201 is tamped by the vibrating rods continuously, the charging speed is high, the consumption of the negative powder is reduced, the operation environment is improved, the breakage of the box body of the material hoppers 200 is avoided, and the service life of the box body is prolonged.
In order to place the feeding platform 1 on the thermal insulation layer 300 on the peripheral side of the bin 200, in an embodiment of the present utility model, referring to fig. 3, the width of the feeding platform 1 is L1, and the width of the bin 200 is L2, where L1 > L2. The width of the feeding platform 1 is larger than that of the material box 200, so that the material box 200 is prevented from being damaged by the feeding platform 1, and the service life of the material box 200 is prolonged.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (10)
1. A box graphitizing furnace feeding device, comprising:
the feeding platform can move up and down and move in the horizontal direction, the upper surface of the feeding platform is used for powder placement, and a plurality of through holes are formed in the upper surface of the feeding platform; the method comprises the steps of,
the plurality of conveying hoppers are uniformly distributed in the horizontal direction, the top ends of the conveying hoppers are provided with feeding ports, the bottom ends of the conveying hoppers are provided with discharging ports, and the feeding ports of the conveying hoppers can be communicated with the corresponding through holes.
2. The box-type graphitizing furnace feeding device according to claim 1, further comprising a plurality of beam brackets, wherein the plurality of beam brackets are arranged on two sides of the feeding platform along the length direction and are positioned below the feeding platform for supporting the feeding platform.
3. The box-type graphitizing furnace feeding device according to claim 2, wherein the beam support comprises a supporting beam and a backing plate connected to the bottom of the supporting beam, the supporting beam is arranged on two sides of the feeding platform along the length direction and is positioned below the feeding platform, the supporting beam extends downwards, and the distance between the backing plate and the lower surface of the feeding platform is H, wherein H is more than or equal to 10 and less than or equal to 40cm.
4. The box-type graphitizing furnace feeding device according to claim 1, wherein the end face of each feeding port is flush with the upper surface of the feeding platform; or alternatively, the process may be performed,
the end face of each feeding port is lower than the upper surface of the feeding platform.
5. The box-type graphitizing furnace feeding device according to claim 1, further comprising a plurality of hanging rings, wherein the hanging rings are arranged at intervals along the circumferential direction of the feeding platform and are positioned above the feeding platform, and the hanging rings are used for being connected with lifting equipment.
6. The box-type graphitizing furnace charging apparatus of claim 1, wherein the charging platform comprises a plurality of cross beams and a plurality of stringers, each of the cross beams and each of the stringers overlapping one another to collectively define a plurality of the vias.
7. The box-type graphitizing furnace charging device according to claim 1, wherein the charging platform comprises:
a platform body;
the two main coamings are arranged on two sides of the feeding platform along the length direction and above the feeding platform, and each main coaming and the feeding platform form an included angle;
the side coamings are arranged on two sides of the feeding platform in the width direction and above the feeding platform, and each side coaming and the feeding platform form an included angle; the method comprises the steps of,
four joint plates, two ends of each joint plate are connected with the adjacent main coaming plate and the adjacent side coaming plate;
the platform comprises a platform body, two main coamings, two side coamings and four connecting plates, wherein the platform body, the two main coamings, the two side coamings and the four connecting plates jointly enclose to form an accommodating space, and the sectional area of the accommodating space is gradually increased from bottom to top.
8. The box-type graphitizing furnace charging device according to claim 1, wherein the box-type graphitizing furnace charging device comprises a plurality of hopper groups arranged at intervals along the length direction of the charging platform, and each hopper group comprises a plurality of conveying hoppers arranged at intervals along the width direction of the charging platform.
9. A box graphitization furnace system comprising:
a box graphitizing furnace charging apparatus according to any one of claims 1 to 8; the method comprises the steps of,
the hopper is provided with a plurality of hoppers corresponding to the plurality of conveying hoppers, and each hopper is used for receiving powder conveyed by each conveying hopper.
10. The box-type graphitization furnace system of claim 9, wherein the feed deck has a width L1 and the headbox has a width L2, wherein L1 > L2.
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| CN202223589099.2U CN219121086U (en) | 2022-12-28 | 2022-12-28 | Box graphitization furnace feeding device and box graphitization furnace system |
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