A plate entry and exit system and method for electrolysis process

Abstract

The present invention discloses a plate entry and exit system and method for an electrolytic process, relating to the field of metallurgical equipment technology. The system comprises: two parallel rail beams arranged along the width of the electrolytic cell; a plate rack fixedly connected to the rail beams, a vacant space provided in the middle of the plate rack, and a first temporary storage rack and a second temporary storage rack provided on either side of the vacant space; a lifting trolley located between the two rail beams and movable along the rail beams, comprising a synchronous movement mechanism that cooperates with the rail beams to achieve synchronous movement, a connecting frame connecting the two synchronous movement mechanisms, a guide sleeve vertically fixed to the connecting frame, a guide column vertically penetrating the guide sleeve, a hanger fixed to the bottom of the guide column, a lifting drive unit that drives the hanger to rise and fall, and multiple groups of independently controlled hangers arranged along the length of the hanger, each group of hangers comprising multiple hooks and a hook drive unit that drives the hooks to rotate. The plate entry and exit system of the present invention can efficiently and stably complete the task of replacing the plate.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical equipment, and in particular to a plate entry and exit slot system and method for an electrolysis process. Background Art

[0002] In the metal electrolytic refining process, the electrode plates, as the core carriers of the electrolytic reaction, need to be periodically extracted from the electrolytic cell to strip off the deposited elemental metal, and the empty plates need to be reinserted to maintain continuous production. The traditional operation mode relies on manual operation, which has inherent defects such as low efficiency and great safety hazards. In order to improve the level of automation, a variety of mechanized extraction and discharge devices have been proposed in the prior art, such as the use of overhead cranes equipped with slings to realize batch transfer of electrode plates. However, such systems still have the following defects: the existing devices mostly adopt an operation mode of extracting the electrode plates of the entire cell at one time, which results in an empty cell state in the electrolytic cell, causing a momentary short circuit in the electrolytic cell, which seriously affects the normal production order. In order to solve the short circuit problem, additional copper plates have to be set for conduction, which increases the equipment cost and operation complexity. Summary of the Invention

[0003] In response to the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a plate entry and exit system and method for electrolysis process, which realizes the replacement of partial plates in batches through independent control of multiple groups of hangers, while reducing the overall movement of the equipment, improving the efficiency of plate replacement and reducing energy consumption.

[0004] The present invention provides a plate entry and exit system for an electrolysis process, comprising:

[0005] Two parallel rail beams arranged along the width of the electrolytic cell;

[0006] A plate rack fixedly connected to the track beam, wherein the middle portion of the plate rack is provided with spaces for upper and lower plates corresponding to the electrolytic cell, and a first temporary storage rack and a second temporary storage rack are provided on both sides of the space for storing empty plates and plates taken out of the electrolytic cell respectively;

[0007] a lifting trolley located between the two rail beams and movable along the rail beams, the lifting trolley running between the first temporary storage rack, the empty space, and the second temporary storage rack, and used to take out the plate from the electrolytic cell through the empty space and transfer it to the second temporary storage rack, and take out the empty plate from the first temporary rack and place it into the electrolytic cell through the empty space;

[0008] The lifting trolley includes: a synchronous moving mechanism that cooperates with the track beams to achieve synchronous movement; a connecting frame connecting the two synchronous moving mechanisms; a guide sleeve vertically fixed on the connecting frame; a guide column vertically passing through the guide sleeve; a hanger fixed at the bottom of the guide column; a lifting drive unit that drives the hanger to rise and fall; a plurality of groups of slings arranged along the length direction of the hanger and independently controlled, each group of slings including a plurality of hooks, the hooks are rotatably connected to both sides of the hanger in groups of two, and a hook drive unit for synchronously driving the hooks to rotate is provided on both sides of each group of slings.

[0009] Furthermore, the hook drive unit includes an electric push rod fixedly mounted on the hanger, the output end of the electric push rod is connected to a linear rack, and the top end of each hook is fixedly connected to a gear meshing with the linear rack.

[0010] Furthermore, there are lifting rings on the four corners of the hanger, and the lifting drive unit includes a driving motor fixedly installed on a connecting frame. The output end of the driving motor is connected to a horizontally arranged rotating shaft, and the rotating shaft is installed on the connecting frame through a bearing seat. The two ends of the rotating shaft are fixedly connected to pulleys, and two connecting belts are wound around the pulleys. The free ends of the two connecting belts are led out from the pulleys and are respectively connected to the lifting rings on the same side.

[0011] Furthermore, a plate limiting mechanism is respectively installed at the bottom of the first temporary storage rack and the second temporary storage rack, and the plate limiting mechanism includes a slide rail set at the bottom of the first temporary storage rack / the second temporary storage rack, a mobile frame slidingly matched with the slide rail, and a driving electric cylinder driving the mobile frame to move along the slide rail. A plurality of positioning blocks are provided on the side close to the two mobile frames, and a clamping gap adapted to the thickness of the plate is provided between the positioning blocks.

[0012] Furthermore, the cross section of the positioning block is triangular, and two sides thereof are provided with guiding inclined surfaces that contact the bottom of the electrode plate.

[0013] Furthermore, the first temporary storage rack and the second temporary storage rack are provided with a plurality of positioning grooves for positioning and placing the electrode plates.

[0014] Furthermore, both ends of the track beam are connected to a longitudinal moving mechanism, and the longitudinal moving mechanism includes a longitudinal guide rail arranged along the length direction of the electrolytic cell, and a traveling component connected to the track beam and moving along the longitudinal guide rail.

[0015] Furthermore, the longitudinal guide rail is erected above the electrolytic cell via a supporting mechanism.

[0016] Furthermore, the support mechanism includes support columns connected to the longitudinal guide rails and reinforcement rods connected to the support columns, and the bottom plate of the support mechanism is provided with a walking chassis.

[0017] The present invention also provides a method for inserting and removing a plate into and out of a tank for an electrolysis process, using the above-mentioned system for inserting and removing a plate into and out of a tank, the method comprising the following steps:

[0018] S1. At the plate loading and unloading station, all the lifting devices on the lifting trolley act synchronously to hook the empty plates and transport them to the first temporary storage rack for storage through the empty space.

[0019] S2. Transfer the entire plate inlet and outlet system to the top of the electrolytic cell, and make the empty space correspond to the electrolytic cell;

[0020] S3, the lifting drive unit drives the hanger to descend to the plate taking station, and then the hook drive unit of the first group of spreaders drives the hook to rotate and hook the plate in the electrolytic cell. After the lifting drive unit drives the hanger to rise to the position, the synchronous moving mechanism drives the lifting trolley to move horizontally to the top of the second temporary storage rack, and places the hoisted plate on the second temporary storage rack;

[0021] S4, the synchronous movement mechanism drives the lifting trolley to move horizontally to above the first temporary storage rack, the hanger is lowered, the first group of lifting tools hooks a corresponding number of empty plates from the first temporary storage rack, and then the lifting trolley moves to above the empty space;

[0022] S5, the plate limiting mechanism extends, the lifting drive unit drives the hanger to descend, and the plate limiting mechanism positions each plate, and the plate is placed in the electrolytic cell, completing a plate replacement;

[0023] S6, the second set of hoists moves to hook the second set of plates in the electrolytic cell, and then repeat steps S3-S5; after multiple sets of hoists complete the plate replacement in sequence, the track beam and the lifting trolley move as a whole along the length direction of the electrolytic cell to the next plate replacement station for plate replacement until all empty plates are replaced or all plates in the electrolytic cell are replaced, and then the entry and exit system returns to the plate loading and unloading station as a whole, and all hoists on the lifting trolley move synchronously to hook the plates on the second temporary storage rack and transport them out, and then transport the empty plates to the first temporary storage rack.

[0024] The beneficial effects of the present invention are:

[0025] (1) Through the independent control of multiple groups of hoists and the dynamic batch extraction strategy, the number of plate replacements can be adjusted on demand, completely avoiding the empty state of the electrolytic cell, so that the electrolytic cell always keeps some plates working normally. There is no need to set up additional devices such as conductive copper plates, which greatly maintains the continuity of production and saves production and maintenance costs.

[0026] (2) The process of plates entering and exiting the tank is optimized by rationally partitioning the first temporary rack, the second temporary rack, and the empty space. The lifting trolley operates efficiently between the first temporary rack, the empty space, and the second temporary rack, and the plates are quickly transferred. Multiple groups of lifting tools operate in batches. During the plate changing process, the lifting trolley mainly moves horizontally, without the need to frequently move along the length of the electrolytic cell. This reduces the plate changing time, greatly improves the plate changing efficiency, and reduces the energy consumption of the equipment.

[0027] (3) By replacing the plates in batches, the number of plates involved in each operation is small. During the lifting and placement process, the posture and force of the plates can be better controlled, reducing the risk of plate deformation due to improper operation and ensuring that the plates can be smoothly placed in the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a plate entry and exit slot system for an electrolysis process according to the present invention.

[0029] Figure 2 It is a structural schematic diagram of the lifting trolley of the present invention.

[0030] Figure 3 It is a structural schematic diagram of the spreader of the present invention.

[0031] Figure 4 It is a structural schematic diagram of the plate limiting mechanism of the present invention.

[0032] Figure 5 It is a schematic diagram of the overall structure including the longitudinal moving mechanism and the supporting structure.

[0033] In the figure: track beam 100, plate rack 200, empty space 201, first temporary storage rack 202, second temporary storage rack 203, plate limiting mechanism 204, slide rail 2041, mobile frame 2042, driving electric cylinder 2043, positioning block 2044, lifting trolley 300, synchronous moving mechanism 301, connecting frame 302, guide sleeve 303, guide column 304, lifting drive unit 305, drive motor 3051, rotating shaft 3052, pulley 3053, connecting belt 3054, hanger 306, hanger 307, hook 3071, hook drive unit 3072, electric push rod 3073, linear rack 3074, gear 3075, longitudinal moving mechanism 400, walking assembly 401, longitudinal guide rail 402, support mechanism 500, support column 501, walking chassis 502. DETAILED DESCRIPTION

[0034] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0035] like Figure 1 As shown, this embodiment provides a plate entry and exit system for an electrolytic process, comprising a track beam 100, a plate rack 200, and a lifting trolley 300. The two track beams 100 are arranged in parallel and extend along the width direction of the electrolytic cell. The plate rack 200 is fixedly installed below the track beam 100. The middle part of the plate rack 200 is provided with an empty space 201 for the upper and lower plates corresponding to the electrolytic cell. The width of the empty space 201 is adapted to the width of the plate. A first temporary storage rack 202 and a second temporary storage rack 203 for storing empty plates and plates removed from the electrolytic cell are respectively provided on both sides of the empty space 201. Optionally, in order to achieve the positioning and placement of the plates placed on the first temporary storage rack 202 and the second temporary storage rack 203, a plurality of positioning grooves for positioning the plates are provided on the first temporary storage rack 202 and the second temporary storage rack 203. The lifting trolley 300 is located between the two rail beams 100 and can move along the rail beams 100. The lifting trolley 300 runs between the first temporary storage rack 202, the empty space 201, and the second temporary storage rack 203. It is used to take out the electrode plate from the electrolytic cell through the empty space 201 and transfer it to the second temporary storage rack 203, and take out the empty electrode plate from the first temporary storage rack 202 and place it into the electrolytic cell through the empty space 201.

[0036] like Figure 2 、 Figure 3 As shown, the lifting trolley 300 of this embodiment includes a synchronous movement mechanism 301, a connecting frame 302, a guide sleeve 303, a guide column 304, a lifting drive unit 305, a hanger 306, and a sling 307. The synchronous movement mechanism 301 cooperates with the track beam 100 to achieve synchronous movement, ensuring synchronization of the lifting trolley 300 during lateral movement. The connecting frame 302 connects the synchronous movement mechanism 301 into a whole, enhancing structural stability.

[0037] The guide sleeve 303 is vertically fixed to the connecting frame 302, the guide column 304 vertically passes through the guide sleeve 303, and the hanger 306 is fixed to the bottom of the guide column 304. The guide sleeve 303 and the guide column 304 cooperate to provide precise guidance for the lifting and lowering of the hanger 306, ensuring the stability of the hanger during the lifting process, minimizing the shaking of the plate, and improving the accuracy of the plate placement.

[0038] In this embodiment, the four corners of the hanger 306 are provided with lifting rings. The lifting drive unit 305 includes a drive motor 3051 fixedly mounted on the connecting frame 302. The output end of the drive motor 3051 is drivingly connected to a horizontally arranged rotating shaft 3052, which is mounted on the connecting frame 302 via a bearing seat. The ends of the rotating shaft 3052 are fixedly connected to pulleys 3053. Two connecting belts 3054 are wound around the pulleys 3053. The free ends of the two connecting belts 3054 are extended from the pulleys 3053 and connected to the lifting rings on the same side. This design transmission method has a simple structure and reliable operation, and can achieve smooth lifting and lowering of the hanger and accurately control the lifting height of the hanger.

[0039] like Figure 3 As shown, multiple groups of spreaders 307 are arranged along the length of the hanger 306, and each group of spreaders 307 is independently controlled. Each group of spreaders 307 includes multiple hooks 3071, which are connected to the two sides of the hanger 306 in pairs. The hook drive units 3072 are respectively provided on both sides of each group of spreaders 307 to synchronously drive the hooks 3071 to rotate.

[0040] The hook drive unit 3072 includes an electric push rod 3073 fixedly mounted on the hanger 306, the output end of the electric push rod 3073 is connected to a linear rack 3074, and the top of each hook 3071 is fixedly connected to a gear 3075 meshing with the linear rack 3074. The synchronous rotation of the hook 3071 is achieved through the cooperation of the electric push rod 3073, the linear rack 3074 and the gear 3075.

[0041] like Figure 1 、 Figure 4 As shown, in this embodiment, a plate limiting mechanism 204 is installed at the bottom of each of the first temporary storage rack 202 and the second temporary storage rack 203. The plate limiting mechanism 204 includes a slide rail 2041 provided at the bottom of the first temporary storage rack 202 / second temporary storage rack 203, a mobile frame 2042 that slides with the slide rail 2041, and a driving electric cylinder 2043 that drives the mobile frame 2042 along the slide rail 2041. A plurality of positioning blocks 2044 are provided on the side adjacent to the two mobile frames 2042. A clamping gap adapted to the thickness of the plate is defined between the positioning blocks 2044. The positioning blocks 2044 have a triangular cross-section, with guiding slopes on both sides that contact the bottom of the plate. This design facilitates the plate's entry into the clamping gap between the positioning blocks while accurately positioning the plate, ensuring accurate placement during placement.

[0042] like Figure 5As shown, in this embodiment, both ends of the track beam 100 are connected to a longitudinal moving mechanism 400, and the longitudinal moving mechanism 400 includes a longitudinal guide rail 402 arranged along the length direction of the electrolytic cell, and a walking component 401 connected to the track beam 100 and moving along the longitudinal guide rail 402. The longitudinal guide rail 402 is erected above the electrolytic cell through a supporting mechanism 500, so that the plate entry and exit system can be flexibly moved in the length direction of the electrolytic cell to adapt to the plate replacement needs at different positions.

[0043] To facilitate the overall movement of the plate entry and exit system and realize the loading and unloading of the plates, the support mechanism 500 includes a support column 501 connected to the longitudinal guide rail 402 and a reinforcement rod connected to the support column 501. The bottom plate of the support mechanism 500 is provided with a walking chassis 502.

[0044] The method for inserting and removing a plate from a tank for an electrolysis process provided by the present invention comprises the following steps:

[0045] S1. At the plate loading and unloading station, all the lifting devices 307 on the lifting trolley 300 move synchronously to pick up the empty plates and transport them to the first temporary storage rack 202 through the empty space 201 for storage, in preparation for the subsequent plate replacement operation.

[0046] S2. Move the entire plate inlet and outlet system to the top of the electrolytic cell, and make the empty space 201 correspond to the electrolytic cell;

[0047] S3, the lifting drive unit 305 drives the hanger 306 to descend to the plate taking station, and then the hook drive unit 3072 of the first group of lifting devices 307 drives the hook 3071 to rotate and hook the plate in the electrolytic cell. After the lifting drive unit 305 drives the hanger 306 to rise to the position, the synchronous moving mechanism 301 drives the lifting trolley 300 to move horizontally above the second temporary storage rack 203 and place the lifted plate on the second temporary storage rack 203;

[0048] S4, the synchronous moving mechanism 301 drives the lifting trolley 300 to move horizontally to above the first temporary storage rack 202, the hanger 306 descends, the first group of lifting tools 307 hooks a corresponding number of empty plates from the first temporary storage rack 202, and then the lifting trolley 300 moves to above the empty space 201;

[0049] S5, the plate limiting mechanism 204 extends, the lifting drive unit 305 drives the hanger 306 to descend, and the plate limiting mechanism 204 positions each plate, and the plate is placed in the electrolytic cell, completing a plate replacement;

[0050] S6, the second set of hoists 307 moves to hook the second set of plates in the electrolytic cell, and then repeat steps S3-S5; after multiple sets of hoists 307 complete the plate replacement in sequence, the track beam 100 and the lifting trolley 300 move as a whole along the length direction of the electrolytic cell to the next plate replacement station for plate replacement, until all the empty plates are replaced or all the plates in the electrolytic cell are replaced, and then the entry and exit system returns to the plate loading and unloading station as a whole, and all the hoists 307 on the lifting trolley 300 move synchronously to hook the plates on the second temporary storage rack 203 and transport them out, and then transport the empty plates to the first temporary storage rack 202.

[0051] Through the above steps, the automated and efficient replacement of the entire electrolytic cell plate is achieved.

[0052] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A plate inlet and outlet system for an electrolysis process, characterized in that: include: Two parallel track beams (100) arranged along the width direction of the electrolytic cell; A plate rack (200) fixedly connected to the track beam (100), wherein a space (201) for upper and lower plates corresponding to the electrolytic cell is provided in the middle of the plate rack (200), and a first temporary storage rack (202) and a second temporary storage rack (203) for storing empty plates and plates taken out of the electrolytic cell are provided on both sides of the space (201), and a plurality of positioning grooves for positioning and placing the plates are provided on the first temporary storage rack (202) and the second temporary storage rack (203); a lifting trolley (300) located between the two track beams (100) and movable along the track beams (100), the lifting trolley (300) running between the first temporary storage rack (202), the empty space (201), and the second temporary storage rack (203), and used for taking out the electrode plate from the electrolytic cell through the empty space (201) and transferring it to the second temporary storage rack (203), and taking out the empty electrode plate from the first temporary storage rack (202) and placing it into the electrolytic cell through the empty space (201); The hoisting trolley (300) comprises: synchronous movement mechanisms (301) respectively cooperating with the track beams (100) to achieve synchronous movement; a connecting frame (302) connecting the two synchronous movement mechanisms (301); a guide sleeve (303) vertically fixed on the connecting frame (302); a guide column (304) vertically penetrating the guide sleeve (303); a hanger (306) fixed at the bottom of the guide column (304); a lifting drive unit (305) for driving the hanger (306) to rise and fall; and a plurality of groups of independently controlled hangers (307) arranged along the length direction of the hanger (306), each group of hangers (307) comprising a plurality of hooks (3071), the hooks (3071) being rotatably connected to both sides of the hanger (306) in pairs, and a hook drive unit (3072) for synchronously driving the hooks (3071) to rotate is respectively provided on both sides of each group of hangers (307).

2. The plate entry and exit system for electrolysis process according to claim 1, characterized in that: The hook drive unit (3072) comprises an electric push rod (3073) fixedly mounted on the hanger (306); the output end of the electric push rod (3073) is connected to a linear rack (3074); and the top end of each hook (3071) is fixedly connected to a gear (3075) meshing with the linear rack (3074).

3. The plate entry and exit system for electrolysis process according to claim 1, characterized in that: The four corners of the hanger (306) are respectively provided with lifting rings. The lifting drive unit (305) comprises a driving motor (3051) fixedly mounted on a connecting frame (302). The output end of the driving motor (3051) is transmission-connected to a horizontally arranged rotating shaft (3052). The rotating shaft (3052) is mounted on the connecting frame (302) via a bearing seat. Both ends of the rotating shaft (3052) are respectively fixedly connected to pulleys (3053). Two connecting belts (3054) are wound around the pulleys (3053). The free ends of the two connecting belts (3054) are drawn out from the pulleys (3053) and are respectively connected to the lifting rings on the same side.

4. The plate entry and exit system for electrolysis process according to claim 1, characterized in that: A plate limiting mechanism (204) is respectively installed at the bottom of the first temporary storage rack (202) and the second temporary storage rack (203). The plate limiting mechanism (204) comprises a slide rail (2041) provided at the bottom of the first temporary storage rack (202) / the second temporary storage rack (203), a movable frame (2042) slidingly engaged with the slide rail (2041), and a driving electric cylinder (2043) driving the movable frame (2042) to move along the slide rail (2041). A plurality of positioning blocks (2044) are provided on a side adjacent to the two movable frames (2042), and a clamping gap adapted to the thickness of the plate is provided between the positioning blocks (2044).

5. The plate entry and exit system for electrolysis process according to claim 4, characterized in that: The positioning block (2044) has a triangular cross-section, with guiding inclined surfaces on both sides thereof in contact with the bottom of the electrode plate.

6. A plate inlet and outlet system for electrolysis process according to any one of claims 1 to 5, characterized in that: Both ends of the track beam (100) are connected to a longitudinal movement mechanism (400), and the longitudinal movement mechanism (400) comprises a longitudinal guide rail (402) arranged along the length direction of the electrolytic cell, and a traveling assembly (401) connected to the track beam (100) and moving along the longitudinal guide rail (402).

7. The plate entry and exit system for electrolysis process according to claim 6, characterized in that: The longitudinal guide rail (402) is mounted above the electrolytic cell via a support mechanism (500).

8. The plate entry and exit system for electrolysis process according to claim 7, characterized in that: The support mechanism (500) comprises a support column (501) connected to the longitudinal guide rail (402) and a reinforcement rod connected to the support column (501); the bottom plate of the support mechanism (500) is provided with a walking chassis (502).

9. A method for inserting and removing a plate from a tank for an electrolysis process, characterized in that: The method of applying the plate entry and exit system for an electrolysis process according to any one of claims 1 to 8 comprises the following steps: S1. At the plate loading and unloading station, all the lifting devices (307) on the lifting trolley (300) move synchronously to hook the empty plates and transport them to the first temporary storage rack (202) for storage through the empty space (201); S2, transferring the entire plate inlet and outlet system to the top of the electrolytic cell, and making the empty space (201) correspond to the electrolytic cell; S3, the lifting drive unit (305) drives the hanger (306) to descend to the plate taking station, and then the hook drive unit (3072) of the first group of hangers (307) drives the hook (3071) to rotate and hook the plate in the electrolytic cell, and then the lifting drive unit (305) drives the hanger (306) to rise to the position, and the synchronous moving mechanism (301) drives the lifting trolley (300) to move horizontally to the top of the second temporary storage rack (203), and places the hoisted plate on the second temporary storage rack (203); S4, the synchronous moving mechanism (301) drives the lifting trolley (300) to move horizontally to above the first temporary storage rack (202), the hanging rack (306) descends, the first group of lifting tools (307) hooks a corresponding number of empty plates from the first temporary storage rack (202), and then the lifting trolley (300) moves to above the empty space (201); S5, the plate limiting mechanism (204) extends, the lifting drive unit (305) drives the hanger (306) to descend, and the plate limiting mechanism (204) positions each plate, and the plate is placed in the electrolytic cell, completing a plate replacement; S6, the second set of hoists (307) moves to hook the second set of plates in the electrolytic cell, and then repeats steps S3-S5; after multiple sets of hoists (307) complete the plate replacement in sequence, the track beam (100) and the lifting trolley (300) move as a whole along the length direction of the electrolytic cell to the next plate replacement station to replace the plates until all the empty plates are replaced or all the plates in the electrolytic cell are replaced, and then the in-and-out tank system returns as a whole to the plate loading and unloading station, and all the hoists (307) on the lifting trolley (300) move synchronously to hook the plates on the second temporary storage rack (203) and transport them out, and then transport the empty plates to the first temporary storage rack (202).

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