Powder storage container

Abstract

This powder storage container comprises: a powder storage body having formed therein a storage space for storing powder; and a sweeper spraying gas to the storage space. The sweeper comprises: a housing having formed therein a gas passage, a gas inlet for guiding the gas toward the gas passage, and a gas injection hole through which the gas in the gas passage is sprayed toward the storage gas; a cylinder having formed therein a cylinder space, and a first gas inlet / outlet and a second gas inlet / outlet which are in communication with the cylinder space and formed to be spaced apart from each other; a piston which is arranged in the cylinder space to be advanced and retracted; a spring for urging the piston; and a stem connected to the piston and opening / closing the gas injection hole. At least one of the housing and the cylinder may comprise a partition wall for partitioning the gas passage and the cylinder space. A through-hole through which the stem passes may be formed in the partition wall.

Description

Powder storage container

[0001] The present invention relates to a powder storage container.

[0002] Manufacturers who produce powder by mixing, crushing, and calcining the positive electrode materials and raw materials, which are the main raw materials for secondary batteries, use powder storage containers such as hoppers and pipes to temporarily store and transport the powder between each process (equipment).

[0003] Powders within powder storage containers, such as hoppers and pipes, can bind together due to van der Waals forces and adhere to the inner walls of the powder storage container. If this adherence prevents the powder from being transported normally, production can decrease.

[0004] This sticking phenomenon can be resolved by installing an air sweeper or air blaster that sprays high-pressure air onto a powder storage body such as a hopper or pipe.

[0005] Air sweepers or air blasters may include valves or springs to spray air. However, if an air sweeper or air blaster is used for a long period of time, metal foreign substances separated from the valves or springs may enter the powder, which can increase the defect rate in the secondary battery process, which is vulnerable to metal foreign substances.

[0006] The present embodiment provides a powder storage container that minimizes the penetration of metal foreign substances into a storage space where the main body is stored.

[0007] A powder storage container according to the present embodiment includes a powder storage body having a storage space in which powder is stored; and a sweeper that sprays gas into the storage space.

[0008] The sweeper may include a housing having a gas passage formed therein, a gas inlet formed to guide gas to the gas passage, and a gas injection port formed to inject gas from the gas passage into a storage space; a cylinder having a cylinder space formed therein, and a first gas inlet and a second gas inlet formed spaced apart from each other and communicating with the cylinder space; a piston disposed so as to be retractable in the cylinder space; a spring supporting the piston; and a stem connected to the piston to open and close the gas injection port.

[0009] The housing and at least one of the cylinders may include a baffle partitioning the gas passage and the cylinder space.

[0010] The bulkhead may have a through hole formed through which the stem passes.

[0011] The powder storage tank may further include a position sensor disposed in the cylinder to detect the piston.

[0012] A magnet may be arranged on the piston, and the position sensor may include a Hall sensor arranged on the outer wall of the cylinder.

[0013] The Hall sensor may include a first Hall sensor that detects the forward movement of the piston; and a second Hall sensor that detects the back of the piston.

[0014] The first Hall sensor and the second Hall sensor can be spaced apart from each other on the outer wall of the cylinder.

[0015] A spring may be placed between the bulkhead and the piston.

[0016] The powder storage body may have a sweeper penetration hole formed therein through which the sweeper passes.

[0017] The cylinder can be connected to the housing.

[0018] The cylinder may include a cylinder body having a cylinder space, a first gas inlet and a second gas inlet formed therein; and a stem supporter supporting a stem.

[0019] The cylinder may further include a sealing body disposed between the cylinder body and the stem support.

[0020] The powder storage container may further include a sealing member that seals between the sealing body and the stem.

[0021] The stem may include a forward / reverse shaft connected to the piston and an opening / closing body formed at one end of the forward / reverse shaft to open / close the gas injection port.

[0022] The powder storage tank may further include a reservoir containing gas and connected to the first gas inlet and the second gas inlet.

[0023] The reservoir may be located outside the powder storage body.

[0024] A plurality of sweepers may be placed spaced apart from each other.

[0025] An example of a receiver is one that can have multiple 1:1 correspondence with a sweeper.

[0026] Another example of a receiver could be connected to multiple sweepers.

[0027] According to this embodiment, since no cylinder, spring or piston is positioned in the air passage of the housing, it is possible to minimize the spraying of metal foreign substances into the powder spraying body through the air passage of the housing, minimize the defect rate and increase productivity.

[0028] Additionally, the stem can close the gas nozzle by a spring, thereby minimizing the infiltration of foreign substances into the powder storage body when the sweeper is not in use.

[0029] Additionally, since no separate solenoid valve is installed within the housing or cylinder, the sweeper can be configured compactly and has less space constraints.

[0030] In addition, gas such as air that collides with the opening and closing body of the stem is sprayed radially, so that powder can be transported over a wide area and the number of sweepers can be minimized.

[0031] Additionally, it can detect the exact position of the stem, allowing for air leakage or malfunction to be detected in advance.

[0032] Figure 1 is a diagram illustrating an example of a powder storage container according to the present embodiment.

[0033] Figure 2 is a cross-sectional view showing an example of a sweeper according to the present embodiment;

[0034] Figure 3 is a cross-sectional view showing another example of a sweeper according to the present embodiment;

[0035] Fig. 4 is a cross-sectional view showing a modified example of a powder storage container according to the present embodiment.

[0036] Hereinafter, specific embodiments of the present invention will be described in detail with drawings.

[0037] FIG. 1 is a diagram illustrating an example of a powder storage container according to the present embodiment, and FIG. 2 is a cross-sectional diagram illustrating an example of a sweeper according to the present embodiment.

[0038] The powder storage container may include a powder storage body (1); and a sweeper (2).

[0039] A storage space (S) in which powder is stored can be formed in the powder storage body (1).

[0040] Examples of the powder storage body (1) may be a hopper, a silo, or a pipe.

[0041] The main storage body (1) may be provided with an extraction port (3) through which powder in the storage space (S) can be extracted. The extraction port (3) may be formed at the bottom of the powder storage body (1).

[0042] The powder storage body (1) may include an upper body (1a) and a lower body (1b) that extends from the upper body (1a) and gradually decreases in size as it gets closer to the discharge port (3).

[0043] A sweeper penetration hole (4) through which a sweeper (2) penetrates can be formed in the powder storage body (1).

[0044] When there are multiple sweepers (2), the number of sweeper penetration holes (4) can be formed as many as the number of sweepers (2). The multiple sweeper penetration holes (4) can include a lower penetration hole (4A) through which the lower sweeper (2A) passes, and an upper penetration hole (4B) through which the upper sweeper (2B) passes.

[0045] A lower penetration hole (4A) can be formed in the lower body (1b).

[0046] An upper through hole (4B) can be formed in the upper body (1a).

[0047] A cover (1c) covering the storage space (S) can be placed on the top of the powder storage body (1).

[0048] A plurality of sweepers (2) may be arranged spaced apart from each other. The plurality of sweepers (2) may include a lower sweeper (2A) close to the outlet (3) among the cover (1c) and the outlet (3), and an upper sweeper (2B) higher than the height of the lower sweeper (2A).

[0049] The powder storage tank may include a plurality of lower sweepers (2A). The plurality of lower sweepers (2A) may be spaced apart horizontally (X) from the lower body (1b).

[0050] The powder storage tank may include a plurality of upper sweepers (2B). The plurality of upper sweepers (2B) may be spaced apart in the horizontal direction (X).

[0051] The lower sweeper (2A) and the upper sweeper (2B) can be spaced apart in the vertical direction (Z).

[0052] Hereinafter, the common configuration of the lower sweeper (2A) and the upper sweeper (2B) will be described by referring to them as sweeper (2).

[0053] The sweeper (2) can spray gas into the storage space (S). An example of the sweeper (2) may be an air spray device capable of spraying high-pressure compressed air into the storage space (S).

[0054] The sweeper (2) can be positioned so as to penetrate the powder storage body (1).

[0055] The sweeper (2) may include multiple members.

[0056] The sweeper (2) may include a housing (5), a stem (6), a piston (7), a spring (8), and a cylinder (9), as shown in FIG. 2.

[0057] The housing (5) may be composed of a combination of multiple members.

[0058] The housing (5) can have a gas passage (P1) formed therein through which a gas (A) such as air passes.

[0059] A gas inlet (51) that guides gas to a gas passage (P1) may be formed in the housing (5), and a gas injection port (52) that injects gas from the gas passage (P1) into a storage space (S, see FIG. 1) may be formed.

[0060] The housing (5) can be arranged to penetrate the powder storage body (1). The housing (5) can be arranged so that the gas inlet (51) is located outside the powder storage body (1) and the gas injection port (52) is located in the storage space (S).

[0061] Gas such as air outside the powder storage body (1) can be injected into the storage space (S) of the powder storage body (1) through the housing (5).

[0062] Air outside the powder storage body (1) can be injected into the storage space (S) of the powder storage body (1) after passing through the air path connecting the gas inlet (51), the gas passage (P1), and the gas injection port (52), and the gas (A) such as air injected into the storage space (S) of the powder storage body (1) can transport the powder contained in the storage space (S) of the powder storage body (1) to the extraction port (3).

[0063] In the housing (5), in particular, a seat body (52a) on which an opening / closing body (62) of a stem (6) is mounted may protrude from the gas injection port (52). A through hole (52b) through which a forward / reverse axis (61) of the stem (6) passes may be formed in the seat body (52a). The cross-sectional area of ​​the through hole (52b) may be smaller than the cross-sectional area of ​​the gas injection port (52). The cross-sectional area of ​​the through hole (52b) may be larger than the cross-sectional area of ​​the forward / reverse axis (61) of the stem (6).

[0064] A partition wall (53) may be formed in the housing (5). The partition wall (53) may be formed on the opposite side of the gas injection port (52) in the housing (5).

[0065] A through hole (54) through which a stem (6) passes may be formed in the housing (5). The through hole (54) may be formed in a partition wall (53) of the housing (5).

[0066] The through hole (54) can be opened in the direction of advancement or retreat of the stem (6) in the bulkhead (53).

[0067] The housing (5) can accommodate a bulkhead sealing member (55, or guide) that seals between the bulkhead (53) and the stem (6).

[0068] The bulkhead sealing member (55) can be placed between the inner circumference of the through hole (53) and the outer circumference of the advance / retreat side (61) of the stem (6).

[0069] Gas (A), such as air, flowing into the gas passage (P1) is blocked by the bulkhead (53) and the bulkhead sealing member (55) and cannot flow into the interior of the cylinder (9). In other words, gas (A), such as air, flowing into the gas passage (P1) does not come into contact with the piston (7) and spring (8) arranged inside the cylinder (9).

[0070] A housing sealing member (56) that seals between the housing (5) and the cylinder (9) may be arranged in the housing (5). The housing sealing member (56) may be arranged on a surface of the bulkhead (53) facing the cylinder (9) and a surface of the cylinder (9) facing the housing (5).

[0071] The stem (6) is connected to the piston (7) and can open and close the gas injection port (52).

[0072] A gas passage (P1) can be formed between the housing (5) and the stem (6). Gas (A), such as air, introduced into the housing (5) can pass between the housing (5) and the stem (6) and then be injected through the gas injection port (52).

[0073] The stem (6) may include an advance / retreat axis (61) that advances / retreats toward the gas injection port (52), and an opening / closing body (62) formed at one end of the advance / retreat axis (61) that opens / closes the gas injection port (52).

[0074] The advance / retreat axis (61) can be arranged across the housing (5).

[0075] The cross-sectional area of ​​the advance / retreat axis (61) may be smaller than the cross-sectional area of ​​the through hole (54).

[0076] The cross-sectional area of ​​the advance / retreat axis (61) may be smaller than the cross-sectional area of ​​the gas injection port (52).

[0077] The cross-sectional area of ​​the advance / retreat axis (61) may be smaller than the cross-sectional area of ​​the hole (52b).

[0078] The cross-sectional area of ​​the opening / closing body (62) may be greater than or equal to the cross-sectional area of ​​the gas injection port (52).

[0079] The opening / closing body (62) can be moved forward and backward from the outside of the housing (5). The opening / closing body (62) can be moved forward from the gas injection port (52) to open the gas injection port (52). The opening / closing body (62) can be moved backward to the gas injection port (52) to block the gas injection port (52).

[0080] The opening / closing body (62) may be an outer opening / closing body located outside the housing (5).

[0081] At least one of the opening / closing body (62) and the seat body (52a) may be installed with an opening / closing body sealing member (63) that seals between the opening / closing body (62) and the seat body (52a) when the gas injection port (52) is closed by the opening / closing body (62).

[0082] The opening / closing body sealing member (63) may be made of an elastic material and may absorb shock that may occur when the gas injection port (52) is closed by the opening / closing body (62).

[0083] When the advance / retreat axis (61) advances toward the storage space (S) of the powder storage body (1), the opening / closing body (62) can open the gas injection port (52).

[0084] When the advance / retreat axis (61) is retracted toward the cylinder (9), the opening / closing body (62) can be inserted into the gas injection port (52) and the gas injection port (52) can be closed.

[0085] When the advance / retreat shaft (61) moves forward, gas (A) such as air that has passed through the gas passage (P1) can pass between the inner circumference of the gas injection port (52) and the outer circumference of the advance / retreat shaft (61) and then collide with the opening / closing body (62) located on the outside of the housing (6). The gas (A) such as air that has collided with the opening / closing body (62) can be radiated to the periphery of the opening / closing body (62).

[0086] The piston (7) is connected to the stem (6) and can advance or retract the stem (6).

[0087] The piston (7) can be connected to the other end of the advance / retreat shaft (61).

[0088] The piston (7) can be arranged so as to be retractable in the cylinder space (P2) of the cylinder (9).

[0089] The piston (7) can divide the cylinder space (P2) into a front space (P3) and a rear space (P4). When the pressure in the front space (P3) is higher than the pressure in the rear space (P4), the piston (7) can be retracted. When the pressure in the front space (P3) is lower than the pressure in the rear space (P4), the piston (7) can be advanced.

[0090] The piston (7) may be non-magnetic.

[0091] A magnet (72) for position sensing can be placed on the piston (7).

[0092] The spring (8) can support the piston (7). The spring (8) can limit the piston (7) from moving too rapidly and can help restore the piston (7).

[0093] The spring (8) can urge the piston (7) in the direction of retracting the piston (7) when there is no external force.

[0094] An example of a spring (8) may be a coil spring.

[0095] The cylinder (9) can form a driving unit together with the piston (7) and the spring (8).

[0096] A cylinder space (P2) may be formed inside the cylinder (9). A first gas inlet (91) and a second gas inlet (92) may be formed in the cylinder (9).

[0097] The first gas inlet (91) and the second gas inlet (92) may be connected to the cylinder space (P2). The first gas inlet (91) and the second gas inlet (92) may be formed spaced apart from each other in the cylinder (8).

[0098] The first gas inlet (91) can be connected to the front space (P3).

[0099] The second gas inlet (92) can be connected to the rear space (P4).

[0100] At least one of the housing (5) and the cylinder (9) may include a partition (93) that divides the gas passage (P1) and the cylinder space (P2).

[0101] A through hole (94) through which a stem (6) passes may be formed in the bulkhead (93). The advance / retreat axis (61) of the stem (6) may pass through the through hole (94).

[0102] A spring (8) can be placed between the bulkhead (93) and the piston (7), and the spring (8) can be supported by the bulkhead (93) to support the piston (7).

[0103] The cylinder (9) can be connected to the housing (5).

[0104] The cylinder (9) may be a combination of multiple members.

[0105] The cylinder (9) may include a cylinder body (95); a stem supporter (96) and a sealing body (97).

[0106] A cylinder space (P2), a first gas inlet (91), and a second gas inlet (92) can be formed in the cylinder body (95).

[0107] The stem supporter (96) can support the stem (6). The advance / retreat axis (61) of the stem (6) can be long, and the advance / retreat axis (61) can be supported by the stem supporter (96).

[0108] The stem supporter (96) may have a hollow cylindrical shape and may be elongated in the direction of advancement and retreat of the stem (6). A through hole through which the advancement and retreat axis (61) of the stem (6) passes may be formed in the stem supporter (96).

[0109] A sealing body (97) may be placed between the cylinder body (95) and the stem supporter (96). The sealing body (97) may have a hollow cylindrical shape or a hollow disc shape. A through hole may be formed in the sealing body (97) through which the advance / retreat axis (61) of the stem (6) passes.

[0110] The sweeper (2) may further include a sealing member (98) that seals between the sealing body (97) and the stem (6).

[0111] The sealing member (98) is arranged between the inner circumference of the sealing body (97) and the advance / retreat axis (61) of the stem (6) to seal between the sealing body (97) and the advance / retreat axis (61).

[0112] The bulkhead (93) and the through hole (94) can be formed in at least one of the cylinder body (95), the stem supporter (96), and the sealing body (97).

[0113] Gas in the cylinder space (P2) may be blocked by the bulkhead (93) and may not flow into the housing (5), and metal foreign matter separated from the piston (7) or spring (8) may not flow into the inside of the housing (5), i.e., into the air passage of the housing (5).

[0114] An example of a powder storage tank is a case in which a bulkhead (93) and a penetration hole (94) are formed in a cylinder body (95), and the bulkhead (93) formed in the cylinder body (95) can partition a gas passage (P1) and a cylinder space (P2).

[0115] Another example of a powder storage tank is one in which the sealing body (97) itself includes a partition (93) that divides the gas passage (P1) and the cylinder space (P2), and the sealing body (97) supports a spring (7).

[0116] Another example of a powder storage tank is one in which the stem supporter (96) itself includes a partition (93) that divides the gas passage (P1) and the cylinder space (P2), and the stem supporter (96) also supports a spring (7).

[0117] The powder storage tank may further include a reservoir (10), as shown in Fig. 1.

[0118] The receiver (10) can be connected to the first gas inlet (91) and the second gas inlet (92) of the cylinder (9), respectively, and gas can be stored therein. The receiver (10) can have a space formed therein in which gas is stored.

[0119] A hose (101) for supplying gas such as air from the outside can be connected to the receiver (10).

[0120] Gas in the space of the receiver (10) can flow into the cylinder space (P1), particularly the front space (S3), through the first gas inlet (91) to retract the piston (7), and gas in the cylinder space (P1), particularly the front space (S3), can flow into the receiver (10) through the first gas inlet (91).

[0121] Gas within the space of the receiver (10) can be introduced into the cylinder space (P2), particularly the rear space (S4), through the second gas inlet (92) to advance the piston (7), and gas in the cylinder space (P1), particularly the rear space (S4), can flow into the receiver (10) through the second gas inlet (92).

[0122] The receiver (10) can be located outside the powder storage body (1).

[0123] As shown in Fig. 1, a plurality of receivers (10) may be provided, such as a sweeper (2), and the receivers (10) may correspond 1:1 with the sweepers (2).

[0124] The receiver (10) can be directly connected to the first gas inlet (91) and the second gas inlet (92), or can be connected through a tube (not shown, or a channel).

[0125] A plurality of tubes may be connected to the cylinder (9), and the plurality of tubes may include a first tube connected to the first gas inlet (91) and a second tube connected to the second gas inlet (92).

[0126] The powder storage tank may further comprise at least a solenoid valve for controlling gas inflow and outflow. The solenoid valve may be located outside the housing (5) and the cylinder (9).

[0127] The solenoid valve may include a first solenoid valve that opens and closes to allow gas to flow in and out through the first tube, and a second solenoid valve that opens and closes to allow gas to flow in and out through the second tube.

[0128] Meanwhile, the sweeper (2) may further include a position sensor (11) disposed in the cylinder (9) to detect the piston (7).

[0129] An example of a position sensor (11) may be a magnetic sensor such as a Hall sensor, and the operation of the stem (6) can be monitored.

[0130] The position sensor (11) may include a Hall sensor arranged on the outer wall of the cylinder (9). The position sensor (11) may sense a magnet (72) mounted on the piston (7).

[0131] A plurality of Hall sensors may be provided. The plurality of Hall sensors may include a first Hall sensor (11A) that detects the forward movement of the piston (7); and a second Hall sensor (11B) that detects the backward movement of the piston (7).

[0132] The first hall sensor (11A) and the second hall sensor (11B) can be placed spaced apart from each other on the outer wall of the cylinder (9).

[0133] The sensing results of the position sensor (11) can be output through a display or speaker, etc.

[0134]

[0135] Fig. 3 is a cross-sectional view illustrating another example of a sweeper according to the present embodiment.

[0136] The sweeper (2') illustrated in Fig. 3 may have a single cylinder (9'). The cylinder (9') may have a configuration corresponding to the cylinder (9) illustrated in Fig. 2.

[0137] A cylinder space (P2), a first gas outlet (91) and a second gas outlet (92) can be formed in the cylinder (9').

[0138] The cylinder (9') may include a cover body (9A) surrounding a portion of the housing (5).

[0139] A cover sealing member (9B) that seals between the cover body (9A) and the housing (5) can be placed between the two.

[0140] The sweeper (2') illustrated in Fig. 3 may further include a spring (8') supported on the housing (5) and supporting the piston (7).

[0141] The sweeper (2') illustrated in Fig. 3 may have the same configuration as the sweeper example illustrated in Fig. 2 except for the spring (8') and cylinder (9'), and the same symbols are used and a detailed description thereof is omitted.

[0142]

[0143] Fig. 4 is a cross-sectional view showing a modified example of a powder storage container according to the present embodiment.

[0144] According to the modified example, the powder storage container may have a different number of receivers (10') than the number of sweepers (2). The number of receivers (10') may be less than the number of sweepers (2).

[0145] The receiver (10') may be a single common receiver or a central receiver, and multiple sweepers (2) may be connected to the common receiver (10').

[0146] A common receiver (10') can be connected to a common pipe (102), and a plurality of branch pipes (103, 104) can be connected to the common pipe (102).

[0147] A plurality of sweepers (2) can be distributed and connected to a plurality of branch pipes ((103, 104).

[0148] The powder storage container according to the modified example may have the same configuration of the sweeper (2) as the sweeper (2) illustrated in FIG. 2 or the sweeper (2') illustrated in FIG. 3, and the same symbols are used, and a detailed description thereof is omitted.

[0149] The above description is merely an example of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential characteristics of the present invention.

[0150] Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of ​​the present invention but to explain it, and the scope of the technical idea of ​​the present invention is not limited by these embodiments.

[0151] The scope of protection of the present invention should be interpreted by the claims below, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

Claims

1. A powder storage body having a storage space for storing powder; and Includes a sweeper that sprays gas into the above storage space, The above sweeper A housing having a gas passage formed therein, a gas inlet formed to guide gas into the gas passage, and a gas injection port formed to inject gas from the gas passage into the storage space; A cylinder having a cylinder space formed inside and a first gas inlet and a second gas inlet formed spaced apart from each other and communicating with the cylinder space; A piston arranged so as to be retractable in the above cylinder space; a spring that supports the piston; and It includes a stem connected to the piston and opening and closing the gas injection port, At least one of the above housing and the cylinder includes a bulkhead dividing the gas passage and the cylinder space, A powder storage container having a through hole formed in the above bulkhead through which the above stem passes.

2. In paragraph 1, A powder storage tank further comprising a position sensor disposed in the cylinder and detecting the piston.

3. In paragraph 2, A magnet is placed on the above piston, The above position sensor is a powder storage container including a hall sensor arranged on the outer wall of the cylinder.

4. In paragraph 3, The above Hall sensor A first hall sensor that detects the advancement of the piston; and Including a second hall sensor that detects the foot of the piston, The first and second hall sensors are a powder storage container spaced apart from each other on the outer wall of the cylinder.

5. In paragraph 1, The above spring is a powder storage tank arranged between the bulkhead and the piston.

6. In paragraph 1, A powder storage container having a sweeper penetration hole formed in the above powder storage body through which the sweeper penetrates.

7. In paragraph 1, The above cylinder is a powder storage container connected to the above housing.

8. In paragraph 1, The above cylinder A cylinder body having the above cylinder space, the first gas inlet and the second gas inlet formed therein; and A powder storage container including a stem supporter supporting the above stem.

9. In paragraph 8, The above cylinder A powder storage container further comprising a sealing body disposed between the cylinder body and the stem supporter.

10. In paragraph 9, A powder storage container further comprising a sealing member for sealing between the sealing body and the stem.

11. In paragraph 1, The above stem has a forward / reverse shaft connected to the above piston, A powder storage container including an opening / closing body formed at one end of the above-mentioned advance / retreat axis and opening / closing the gas injection port.

12. In paragraph 1, A powder storage tank further comprising a reservoir containing gas and connected to the first gas inlet and the second gas inlet.

13. In paragraph 12, The above reservoir is a powder storage container located outside the powder storage body.

14. In paragraph 12, The above sweepers are arranged in multiple numbers spaced apart from each other, The plurality of the above reservoirs are powder storage containers corresponding 1:1 to the above sweepers.

15. In paragraph 12, The above sweepers are arranged in multiple numbers spaced apart from each other, The above reservoir is a powder storage tank connected to multiple sweepers.

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