Continuous quantitative supply device for electrode material powder

Abstract

The present invention relates to a continuous quantitative supply device for electrode material powder. The device comprises: a hopper which receives electrode material powder supplied from the outside and discharges the powder downward; a grooved roll which is horizontally installed at the lower portion of the hopper and has formed in the outer circumference thereof a plurality of powder transport grooves extending in the circumferential direction; a first driver which rotates the grooved roll; a press roll which is parallel to the grooved roll and compresses the electrode material powder into the powder transport grooves while allowing the electrode material powder to pass through between the press roll and the grooved roll; a scraper which separates the electrode material powder stuck in the powder transport grooves of the grooved roll from the powder transport grooves; and a rolling unit which rolls the electrode material powder separated by the scraper, while allowing the electrode material powder to pass therethrough. The continuous quantitative supply device for electrode material powder of the present invention, configured as described above, can continuously and quantitatively supply electrode material powder, thereby allowing a dry electrode film having a uniform density and thickness to be manufactured. Also, because the amount of electrode material powder supplied can be easily adjusted, the production speed of an electrode film can be easily adjusted.

Description

Continuous quantitative supply device for electrode powder

[0001] The present invention relates to a powder supply device for secondary battery electrode materials, and more specifically, to a continuous quantitative supply device for electrode material powder that enables the manufacture of a dry electrode film having a uniform density and thickness by continuously quantitatively supplying secondary battery electrode material powder.

[0002] Unlike disposable primary batteries, lithium secondary batteries are rechargeable and reusable. They boast higher output and superior charge-discharge performance compared to other secondary batteries. Consequently, they are widely used in a variety of fields, from mobile IT devices like smartphones and laptops to power sources for electric vehicles and storage devices for power generated by wind and solar power.

[0003] As is well known, secondary batteries are composed of a positive electrode, a negative electrode, an electrolyte, and a separator. The positive and negative electrodes are manufactured into a secondary battery cell through an electrode process, which involves dispersing or dissolving active materials, conductive materials, and binders in a solvent to create a slurry, coating the slurry onto a current collector, and then drying it. The process also involves an assembly process and an activation process.

[0004] However, wet electrode manufacturing methods using solvents can sometimes produce defects such as pinholes and cracks during the drying process. Pinholes and cracks occur as the contained solvent evaporates. Furthermore, differences in solvent evaporation rates can cause powder floating, which degrades electrode quality.

[0005] To address the aforementioned issues, a dry manufacturing method for manufacturing electrodes without using solvents is known. This dry manufacturing method involves passing electrode powder containing an active material, a binder, and a conductive material through a calender roll. The electrode powder, having passed through the calender roll, is laminated and fixed to a current collector as a dry electrode film of a certain thickness.

[0006] In this regard, Korean Patent Publication No. 10-2022-0052852 (Electrode powder for manufacturing dry electrode for secondary battery, manufacturing method thereof, manufacturing method of dry electrode using same, dry electrode, secondary battery including same, energy storage device, and dry electrode manufacturing device) has been disclosed.

[0007] The disclosed dry electrode manufacturing device is a dry electrode manufacturing device, and comprises: a blender for mixing raw composite materials including an active material, a conductive material, and a binder; a kneader for kneading the mixture to form a mixture lump to fiberize the binder; a crusher for crushing the mixture lump to form an electrode powder; a calender for forming the electrode powder into a composite film; and a lamination roll for positioning and laminating the composite film on at least one surface of a current collector.

[0008] Meanwhile, the uniformity of thickness and density in the composite film described above is crucial. Thickness and density must be uniform throughout, without any local variations. To achieve this uniformity, a quantitative supply of electrode powder, i.e., electrode material powder, is crucial. However, conventional dry electrode manufacturing equipment lacks the technology to quantitatively supply electrode material powder.

[0009] The present invention was created to solve the above problems, and the purpose is to provide a continuous quantitative supply device for electrode material powder, which enables the production of a dry electrode film with uniform density and thickness by continuously quantitatively supplying electrode material powder, and which can control the production speed of the electrode film.

[0010] As a technical solution for achieving the above object, the continuous quantitative supply device for electrode material powder of the present invention includes: a hopper for receiving electrode material powder supplied from the outside and discharging it downward; a grooved roll horizontally installed at the bottom of the hopper and having a plurality of powder transfer grooves formed on the outer surface thereof in a circumferential direction; a first driving unit for rotating the grooved roll; a press roll parallel to the grooved roll and passing the electrode material powder between the grooved roll and pressing the electrode material powder into the powder transfer groove; a scraper for separating the electrode material powder embedded in the powder transfer groove of the grooved roll from the powder transfer groove; and a rolling unit for passing and rolling the electrode material powder transferred by the grooved roll.

[0011] On the side of the groove roll, a reverse roll is further provided that is in contact with the outer surface of the groove roll and rotates forward or backward or is kept stationary by a second driving unit.

[0012] At the lower part of the groove roll and reverse roll, guide blocks are installed at a certain interval with respect to the outer surface of the groove roll to guide the electrode powder that has escaped from the powder transfer groove to the rolling section.

[0013] Each powder transfer groove is a groove of a certain width and depth defined by a ring-shaped projection, and the scraper is equipped with a fixed plate that is mounted on the lower side of the groove roll and provides support, and a plurality of insert blades that are integral with the fixed plate and extend to the inside of each powder transfer groove and separate the electrode material powder from the powder transfer groove.

[0014] The roll shafts of the groove roll and the press roll are each equipped with a first gear and a second gear that mesh with each other and match the circumferential speeds of the groove roll and the press roll.

[0015] The above rolling section has a first rolling roll and a second rolling roll that are mutually parallel and spaced apart at a certain interval, and pass and press the electrode powder delivered through the grooved roll to reduce the thickness of the electrode powder.

[0016] In addition, a vibrator is further installed on the outer wall of the hopper to apply vibration to the hopper and induce discharge of electrode powder inside the hopper.

[0017] The continuous quantitative supply device for electrode material powder of the present invention, which is constructed as described above, enables the production of a dry electrode film of uniform density and thickness by continuously quantitatively supplying electrode material powder. In addition, since the supply amount of electrode material powder can be easily controlled, the production speed of the electrode film can be easily controlled.

[0018] In addition, since a certain amount of electrode powder can be continuously supplied in the longitudinal direction, an electrode film of a certain thickness in the longitudinal direction can be manufactured.

[0019] FIG. 1 and FIG. 2 are perspective views of a continuous quantitative supply device for electrode material powder according to one embodiment of the present invention.

[0020] FIG. 3 is a drawing for explaining the overall configuration and operation method of a continuous quantitative supply device for electrode material powder according to one embodiment of the present invention.

[0021] Figure 4 is a drawing showing the configuration of the hopper of Figure 3.

[0022] Figure 5 is a drawing for explaining the operation of the hopper of Figure 4.

[0023] Figures 6 and 7 are drawings showing the configuration of the groove roll, press roll, and reverse roll of Figure 3.

[0024] Figure 8 is an exploded perspective view of the support block and scraper shown in Figure 7.

[0025] Figure 9 is a drawing showing the electrode powder being compressed by the press roll of Figure 8.

[0026] Hereinafter, one embodiment according to the present invention will be described in more detail with reference to the attached drawings.

[0027] FIG. 1 and FIG. 2 are perspective views of a continuous quantitative supply device for electrode material powder according to one embodiment of the present invention, and FIG. 3 is a drawing for explaining the overall configuration and operation method of the quantitative supply device. In addition, FIG. 4 is a drawing showing the configuration of the hopper of FIG. 3, and FIG. 5 is a drawing for explaining the operation of the hopper of FIG. 4.

[0028] And, FIG. 6 and FIG. 7 are drawings showing the configuration of the groove roll, press roll, and reverse roll of FIG. 3, FIG. 8 is an exploded perspective view showing the support block and scraper shown in FIG. 7, and FIG. 9 is a drawing showing the electrode powder being compressed by the press roll of FIG. 8.

[0029] As shown, the electrode powder continuous quantitative supply device (10) according to the present embodiment includes a support structure (11), a hopper (15), a groove roll (21), a first driving unit (17), a press roll (25), a reverse roll (29), a second driving unit (19), a scraper (33), a rolling unit (50), and a control unit (47).

[0030] The support structure (11) includes two vertical fixing plates (11a) having a certain thickness. The vertical fixing plates (11a) are spaced apart from each other in parallel and accommodate a hopper (15), a groove roll (21), a press roll (25), and a reverse roll (29) therebetween. The vertical fixing plates (11a) are spaced apart from each other by a hopper (15) and a spacing bar (11c).

[0031] The hopper (15) receives electrode powder (100) supplied from the outside and discharges it downward. A groove roll (21) and a press roll (25) are provided at the bottom of the hopper (15). The groove roll (21) and the press roll (25) rotate in opposite directions and pass the electrode powder (100) between them.

[0032] The space (15a) of the hopper (15) is a space formed by two vertical fixing plates (11a) and two inclined plates (15b). The inclined plates (15b) are plate-shaped members having an angle of approximately 60 degrees and correspond to each other. Ultimately, the hopper (15) is composed of parts of the vertical fixing plates (11a) on both sides and the inclined plates (15b).

[0033] In addition, an observation window (13) is provided in the portion of the vertical fixing plate (11a) on one side that covers the space portion (15a). The observation window (13) is a transparent window that externally shows the remaining amount of electrode powder (100) contained in the space portion (15a). The operator can check the remaining amount of electrode powder (100) at any time through the observation window (13).

[0034] And, one or more level sensors (43) are installed on the inner inclined plate (15b) of the hopper or the modified fixing plate (11a) that forms the space (15a) by forming the hopper. The level sensor (43) senses the remaining amount of electrode powder (100) and transmits the sensing information to the control unit (47) in real time. The control unit (47) receives the remaining amount information transmitted in real time as feedback and transmits a signal to the powder supply unit (not shown) so that the electrode powder (100) is always maintained at a constant amount in the hopper (15) to supply the electrode powder (100). At this time, the worker can also check the remaining amount information of electrode powder (100) provided in real time by the control unit (47) by wirelessly connecting with a smartphone.

[0035] In addition, a vibrator (41) is mounted on the outer side of the two-sided inclined plates (15b) to induce discharge of the electrode powder (100) within the hopper by applying vibration to the hopper (15). The vibrator (41) applies vibration energy to the hopper (15) to allow the electrode powder (100) to slide down more easily. For example, when the electrode powder (100) is clumped together and does not slide down easily, vibration is applied to induce discharge. The vibrator (41) is also controlled by the control unit (47).

[0036] A pressurizing unit (45) is installed on the upper part of the hopper (15). The pressurizing unit (45) is supported on the upper part of the inclined plate (15b) and the vertical fixing plate (11a) and seals the space (15a). The pressurizing unit (45) controls the pressure inside the space (15a) so that the electrode powder (100) is discharged at a constant pressure. To this end, the pressurizing unit (45) seals the space (15a). Of course, the pressurizing unit (45) can be opened from the hopper (15) to supply the electrode powder (100).

[0037] When air is forced into the space (15a) while the space (15a) is sealed with a pressurizing unit (45), the pressure inside the space (15a) increases, and the pressure acts as a force that pushes down the electrode powder (100).

[0038] The electrode powder (100) is pressed downward by the action of gravity. When a large amount of electrode powder (100) is filled in the space (15a), the total weight is heavier (compared to when a small amount of powder is filled), so the grooved roll (21) and the press roll (25) are pressed relatively strongly. There is bound to be a difference in the pressing pressure when a small amount of electrode powder (100) is filled (the pressing force on the grooved roll and the press roll) and when the amount of electrode powder (100) is relatively large. The stronger the pressing force on the grooved roll and the press roll, the greater the density of the electrode powder that is discharged through the powder conveying groove (21a).

[0039] The pressurizing unit (45) serves to reduce the aforementioned pressure difference. That is, it increases the pressure inside the space (15a) in accordance with the gradual decrease in the remaining amount of electrode powder (100) within the space (15a). As the pressure in the space increases, the increased pressure pushes the electrode powder (100) downward, so that the density per unit volume of the electrode powder that ultimately escapes is constant. The pressurizing unit (45) is controlled by the control unit (47).

[0040] The above pressurizing unit (45) can provide pressure to the electrode powder without directly contacting the electrode powder in a non-contact manner. In this case, the pressurizing unit (45) can control the pressure of the electrode powder by supplying air at a certain pressure toward the hopper. By providing pressure to the electrode powder in a non-contact manner, the agglomeration of the electrode powder can be prevented. Meanwhile, the pressurizing unit can also provide pressure by directly contacting the electrode powder.

[0041] Meanwhile, the groove roll (21) is a member installed horizontally at the bottom of the hopper (15), as illustrated in Fig. 6. A roll shaft (21e) is provided at the central axis of the groove roll (21). The roll shaft (21e) is rotatably supported on the vertical fixing plates (11a) on both sides.

[0042] And, a powder transfer groove (21a) and a ring-shaped protrusion (21a) are formed on the outer surface of the groove roll (21). The powder transfer groove (21a) is a groove having a certain width and depth and extends in the circumferential direction of the groove roll (21). The powder transfer groove (21a) is formed by cutting the outer surface of a cylindrical member having a certain diameter.

[0043] In addition, the ring-shaped protrusion (21a) is a ring-shaped protrusion left on the side of the powder transfer groove (21a). The ring-shaped protrusion (21a) is a part that is automatically created by forming the powder transfer groove (21a) and divides the neighboring powder transfer groove (21a).

[0044] And, a first gear (23) is fixed to one end of the roll shaft (21e), and a driven pulley (17f in Fig. 2) is fixed to the other end on the opposite side. A description related to this will be provided later.

[0045] The first driving unit (17) serves to rotate the groove roller (21). The first driving unit (17) has a fixed bracket (17d), a servo motor (17a), a reducer (17b), a driving pulley (17e), a belt (17g), and a driven pulley (17f).

[0046] The fixed bracket (17d) is a support structure fixed to a vertical fixed plate (11a) on one side and supports a reducer (17b). The reducer (17b) is coupled to the fixed bracket (17d) and receives the rotational force of the servo motor (17a) to rotate the driving pulley (17e).

[0047] In addition, the driving pulley (17e) is connected to the driven pulley (17f) via a belt (17g). The belt (17g) acts as a timing belt and transmits the rotational force of the driving pulley (17e) to the driven pulley (17f). As the driven pulley (17f) rotates, the groove roller (21) also rotates.

[0048] The press roll (25) is parallel to the groove roll (21), and passes the electrode powder (100) between the press roll and the groove roll, thereby pressing the electrode powder into the powder transfer groove (21a).

[0049] A roll shaft (25b) is provided on the central axis of the press roll (25). The roll shaft (25b) is rotatably supported on both vertical fixing plates (11a). A second gear (27) is mounted on one end of the roll shaft (25b). The second gear (27) meshes with the first gear (23). In this way, since the groove roll (21) and the press roll (25) are connected by the first and second gears (23, 27), the groove roll (21) and the press roll (25) rotate simultaneously in opposite directions at the same circumferential speed. Since the groove roll (21) and the press roll (25) rotate in the direction of arrow a and the direction of arrow b, the electrode material powder (100) flows into the space between the groove roll (21) and the press roll (25) and is then guided downward.

[0050] As shown in Fig. 9, the press roll (25) and the groove roll (21) are in linear contact. That is, the outer surface of the press roll (25) is in contact with the outer surface of the ring-shaped projection (21b). In addition, among the electrode powder (100) introduced between the press roll (25) and the groove roll (21), the electrode powder (100) located at the periphery of the powder transfer groove (21a) is pressed by the press roll (25) and pressed in the direction of arrow F. The electrode powder (100) is compacted into the inside of the powder transfer groove (21a) and strongly clumped together.

[0051] The reverse roll (29) is installed on the side of the groove roll (21) and is operated by the second driving unit (19). The reverse roll (29) is a flat roller, like the press roll (25), and is in linear contact with the outer surface of the groove roll (21). The roll shaft (29a) of the reverse roll (29) is rotatably supported on a vertical fixing plate (11a). In addition, a driven pulley (19f) is mounted on one end of the roll shaft (29a). The driven pulley (19f) receives rotational force from the second driving unit (19) and rotates.

[0052] The second driving unit (19) has a fixed bracket (19d), a servo motor (19a), a reducer (19b), a driving pulley (19e), a belt (19g), and a driven pulley (19f).

[0053] The fixed bracket (19d) is a support structure fixed to one side of the vertical fixed plate (11a) and supports the reducer (19b). The reducer (19b) is coupled to the fixed bracket (19d) and receives the rotational force of the servo motor (19a) to rotate the driving pulley (19e). The driving pulley (19e) is connected to the driven pulley (19f) via a belt (19g). The belt (17g) serves as a timing belt and transmits the rotational force of the driving pulley (19e) to the driven pulley (19f). As the driven pulley (17f) rotates, the reverse roll (29) rotates.

[0054] In particular, the servo motor (19a) can rotate in both the forward and reverse directions and can also remain stationary. Accordingly, the reverse roll (29) can rotate in the direction indicated by arrow e in Fig. 3 or in the opposite direction, and can remain stationary. The rotational speed ratio of the reverse roll (29) to the groove roll (21) can be adjusted almost infinitely.

[0055] The reverse roll (29) supports the electrode powder (100) accommodated in the powder transfer groove (21a). For example, while moving from the press roll (25) to the reverse roll (29), the electrode powder (100) lifted from the powder transfer groove (21a) is pressed again.

[0056] According to an embodiment, a ring-shaped protrusion (not shown) that can press and compact the electrode powder (100) (by entering the inside of the powder transfer groove (21a)) may be applied to the outer surface of the reverse roll (29).

[0057] Meanwhile, a guide block (31) is mounted below the connecting portion of the groove roll (21) and the reverse roll (29). The guide block (31) is a block-shaped member made of Teflon, and both ends are fixed to a vertical fixing plate (11a).

[0058] The guide block (31) receives the electrode powder (100) that has passed between the groove roll (21) and the reverse roll (29) and has fallen out of the powder transfer groove (21a) and guides it in the direction of arrow s in Fig. 4. The electrode powder (100) that has fallen out of the powder transfer groove (21a) slides downward along the slide curve (31b) and reaches the upper portion of the first rolling roll (51).

[0059] The guide block (31) is formed with an upper blade portion (31a) and a slide curved surface (31b). The upper blade portion (31a) extends to the portion where the groove roll (21) and the reverse hole (29) are in contact, and prevents the electrode powder (100) that has fallen out of the powder transfer groove (21a) from falling toward the reverse roll (29). In other words, it prevents it from falling in the direction of arrow t in Fig. 4.

[0060] The slide surface (31b) is a surface that forms a constant interval with respect to the outer surface of the groove roll (21). The curvature of the outer surface of the groove roll (21) and the curvature of the slide surface (31b) are the same. Therefore, the interval between the outer surface of the ring-shaped projection (21b) and the slide surface (31b) is the same.

[0061] As mentioned above, the slide surface (31b) guides the electrode powder detached from the powder transfer groove (21a) in the direction of arrow s to the first rolling roll (51) of the rolling section (50). However, the electrode powder (100) that has not detached from the powder transfer groove (21a) moves to the scraper (33) without contacting the guide block (31), and is then separated from the powder transfer groove (21a) by the scraper (33).

[0062] The scraper (33) serves to separate the electrode powder (100) embedded in the powder transfer groove (21a) of the groove roll (21) from the powder transfer groove (21a). The scraper (33) includes a fixed plate (33e) and a plurality of insert blades (33a).

[0063] The fixed plate (33e) is a plate-shaped member having a certain thickness and is supported by the mounting plate (34a) and the connecting plate (34b). The mounting plate (34a) is a square plate having a certain thickness and both ends are fixed to the vertical fixing plates (11a) on both sides. In addition, the connecting plate (34b) is a member that connects the mounting plate (34a) and the scraper (33). The connecting plate (34b) is simultaneously bolted to the scraper (33) and the mounting plate (34a).

[0064] The fixed plate (33e) is fixed to the lower side of the groove roller (21) and has the above-described insert blade (33a) at the tip end. The insert blade (33a) is integrally formed with the fixed plate (33e) and extends toward the inside of each powder transfer groove (21a), separating the electrode material powder (100) from the powder transfer groove (21a). The tip end of the insert blade (33a) is in contact with the bottom surface of the powder transfer groove (21a).

[0065] In addition, a protrusion-receiving slit (33d) is formed between each insert blade (33a). As shown in an enlarged manner in Fig. 7, a ring-shaped protrusion (21b) is received in the protrusion-receiving slit (33d). Since the protrusion-receiving slit (33d) is formed, the insert blade (33a) can contact the bottom of the powder-receiving groove (21a).

[0066] Meanwhile, the rolling unit (50) has a calendaring function that presses and forms the electrode powder (100) into a thinner shape by passing it through. The rolling unit (50) includes a first rolling roll (51) and a second rolling roll (53). The first rolling roll (51) and the second rolling roll (53) are independently driven by respective roll driving units (51a, 53a). The rotation speeds of the first and second rolling rolls (51, 53) are independently controlled.

[0067] The first rolling roll (51) and the second rolling roll (53) are parallel to each other and spaced apart from each other by a certain distance. The first rolling roll (51) and the second rolling roll (53) rotate in opposite directions. The electrode powder (100) delivered through the grooved roll (21) is reduced in thickness as it passes through the first rolling roll (51) and the second rolling roll (53). The electrode powder, which is formed into a sheet shape as it passes through the first and second rolling rolls (51, 53), is pressed and processed into a thinner thickness through a subsequent process.

[0068] The ratio of the rotation speeds of the first and second rolling rolls (51, 55) can be combined in various ways. In this case, when the speed of the first rolling roll (51) is 1, it is preferable to adjust the speed of the second rolling roll (55) to 1 or higher, for example, 1.2 to 2. When the speed of the second rolling roll is faster than that of the first rolling roll, the electrode powder (100) is separated from the first rolling roll and adheres to the second rolling roll, allowing it to move along the second rolling roll.

[0069] The first rolling roll and the second rolling roll may each be made of a special steel material with chrome plating on the surface.

[0070] Above, the present invention has been described in detail through specific examples, but the present invention is not limited to the above examples, and various modifications are possible by a person of ordinary skill within the scope of the technical idea of ​​the present invention.

[0071] It is industrially applicable because it enables the production of a dry electrode film with uniform density and thickness by continuously and quantitatively supplying secondary battery electrode material powder.

Claims

1. A hopper that receives electrode powder supplied from the outside and discharges it downward; A grooved roll installed horizontally at the bottom of a hopper and having a plurality of powder transfer grooves extending in a circumferential direction formed on the outer surface; A first driving unit that rotates the groove roller; A press roll that is parallel to the groove roll, passes the electrode powder between the groove roll and presses the electrode powder into the powder transfer groove; A scraper that separates electrode powder embedded in the powder transfer groove of the groove roll from the powder transfer groove; A rolling section that includes a rolling section that passes and rolls electrode powder transported by a groove roll. Continuous quantitative supply device for electrode material powder.

2. In paragraph 1, On the side of the above groove roll, A reverse roll is further provided that is in contact with the outer surface of the groove roll and rotates forward or backward or remains stationary by a second driving unit. Continuous quantitative supply device for electrode material powder.

3. In paragraph 2, At the bottom of the above groove roll and reverse roll, Equipped with a guide block that forms a certain interval on the outer surface of the groove roll and guides the electrode powder that has escaped from the powder transfer groove to the rolling section. Continuous quantitative supply device for electrode material powder.

4. In paragraph 1, Each powder transfer groove is a groove of a certain width and depth divided by a ring-shaped projection. The above scraper; A fixed plate that is mounted on the lower side of the groove roll and provides support, It is formed integrally with the fixed plate and has a plurality of insert blades extending inside each powder transfer groove and separating electrode powder from the powder transfer groove. Continuous quantitative supply device for electrode material powder.

5. In paragraph 1, For the roll shafts of the groove roll and press roll, Equipped with first and second gears that mesh with each other and match the circumferential speeds of the groove roll and the press roll, respectively. Continuous quantitative supply device for electrode material powder.

6. In paragraph 1, The above rolling part, A first rolling roll and a second rolling roll are provided that are parallel to each other and spaced apart at a certain interval, and pass and pressurize electrode powder delivered through grooved rolls to reduce the thickness of the electrode powder. Continuous quantitative supply device for electrode material powder.

7. In paragraph 6, The second rolling roll rotates at a faster speed than the first rolling roll, so that the sheet-shaped electrode powder that has passed through the first rolling roll and the second rolling roll is moved while attached to the second rolling roll. Electrode material powder quantitative supply device.

8. In paragraph 1, In the above hopper, A vibrator is further installed to induce discharge of electrode powder within the hopper by applying vibration to the hopper. Continuous quantitative supply device for electrode material powder.

9. In paragraph 1, Further comprising a pressurizing unit that applies a constant pressure to the electrode powder accommodated in the above hopper. Electrode powder quantitative supply device..

10. In paragraph 1, The above hopper is characterized in that it is composed of an inclined plate and a vertical fixing plate having a downwardly inclined shape in the shape of a funnel, and a level sensor for sensing the height of the electrode powder filled in the hopper is arranged on the inclined plate or the vertical fixing plate inside the hopper. Electrode material powder quantitative supply device.

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