Edge grinding wastewater treatment equipment for glass product processing

Abstract

The invention relates to the technical field of sewage treatment, in particular to edging wastewater treatment equipment for glass product processing, which comprises a box body, a partition plate is arranged in the box body, the partition plate divides the box body into a separation area and a scum area, the edging wastewater treatment equipment further comprises a scraper movably arranged above the separation area, a follow-up moving unit is movably arranged in the separation area, and the follow-up moving unit is movably arranged in the scum area. According to the edge grinding wastewater treatment equipment for glass product processing, the following type moving unit is composed of the two moving frames, the synchronous reverse moving design is adopted, and the following type moving unit is matched with a scraping plate to form a composite slag scraping structure; when the upper moving frame is pushed towards the scum area along with the scraper blade, the lower moving frame moves in the opposite direction, the one-way push plate is folded to form a water flow channel, and surface scum is guided towards the scum scraping area under the action of pressure difference, so that the scum collecting efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to equipment for treating edge grinding wastewater from glass product processing. Background Technology

[0002] During the processing of glass products, it is necessary to grind the edges to make them smooth. This process generates a large amount of dust, which is discharged along with the rinsing water. If this wastewater is discharged directly into the outside world, it will cause environmental pollution. Therefore, it needs to be treated before discharge. Currently, most of these treatments are done using air flotation scrapers.

[0003] Air flotation equipment uses a dissolved air system to generate a large number of microbubbles in water, causing air to adhere to suspended particles in the form of highly dispersed microbubbles, resulting in a density less than that of water, causing them to float on the water surface, thus achieving solid-liquid separation in water treatment. However, the scrapers of existing air flotation scrapers are fixed. If it rains and the water level cannot be adjusted in time, the scum will overflow from the equipment before the scum is cleaned up. This will not only cause pollution to the outside of the equipment, but may also lead to poor internal water treatment effect due to untimely scum scraping.

[0004] To address the aforementioned issues, Chinese Patent 202311858074.4 discloses an air flotation scraping device, comprising a base frame, the interior of which, from left to right, are arranged a reaction zone, a contact zone, a scraping structure, and a waste sludge tank; the reaction zone includes: an inlet located at one end of the base frame near the reaction zone; and a stirrer rotatably connected inside the reaction zone, used to stir the chemicals and wastewater within the reaction zone; the contact zone includes: an air strip string located inside the contact zone near one end of the reaction zone, and at the bottom of the contact zone; the scraping structure includes: two scraping frames located at the upper end of the base frame.

[0005] However, although the scraper is designed to be telescopic to solve the problem of the scraper not being adjustable, it has internal structures such as threads, grooves, and universal joints. While these structures enable the scraper to move telescopically, in the actual scraping process, some waste residue may remain on the scraper and may enter the scraper's interior. As a result, waste residue accumulates in the internal threaded transmission mechanism and the grooved guide device. After long-term operation, this can cause transmission jamming. The universal joint structure may also be damaged due to particle intrusion, causing the scraper to be unable to extend or retract normally, resulting in unstable use and a short service life.

[0006] Therefore, we propose a wastewater treatment equipment for glass product processing. Summary of the Invention

[0007] To solve the above-mentioned technical problems, this application provides a wastewater treatment device for edging in glass product processing, including a tank, a partition is provided inside the tank, the partition divides the tank into a separation zone and a scum zone, and a scraper is movably disposed above the separation zone. A following moving unit is movably disposed in the separation zone, which includes two moving frames located at opposite ends of the separation zone. A scum removal plate is provided above the partition.

[0008] In some embodiments, rotating shafts are rotatably provided on both sides of the housing, both rotating shafts are located within the separation zone, sprockets are provided on the outer sides of both ends of the rotating shafts, chains are provided on the outer sides of the sprockets, the two rotating shafts are synchronously driven by the chains, and the scraper is provided on the chains and moves synchronously with the chains.

[0009] In some embodiments, the inner walls on both sides of the box are provided with sliding grooves, and mounting blocks are slidably arranged in the sliding grooves. A horizontal plate is fixedly connected to the mounting block. Limiting posts are provided on both sides of the horizontal plate. A traction rope sleeve is sleeved on the outside of the two limiting posts. Two connecting blocks are provided on the outside of the traction rope sleeve. The two connecting blocks divide the traction rope sleeve equally. The two movable frames are respectively connected to the two connecting blocks.

[0010] In some embodiments, the inner wall of the chute is provided with a plurality of threaded holes, and the mounting block is installed in the chute by bolts.

[0011] In some embodiments, the mobile frame includes a frame body on which a plurality of one-way push plates are arranged in a linear array. Two frames are arranged vertically, and the one-way push plates on the two frames are staggered.

[0012] In some embodiments, a rotating seat is fixedly provided on the frame, and the one-way push plate is rotatably provided on the rotating seat. A limit plate is fixedly provided on one side of the rotating seat so that the one-way push plate can remain vertical when the frame moves the one-way push plate in the direction of slag scraping inside the box. A fixing block is fixedly provided on the other side of the rotating seat.

[0013] In some embodiments, an extension plate is slidably disposed inside the scraper, and a spring is disposed at one end of the extension plate inside the scraper, the other end of the spring being connected to the inside of the scraper.

[0014] In some embodiments, a motor is provided on the outside of the housing, and a lead screw is provided at the output end of the motor. The lead screw is rotatably located on the outside of the housing, and a connecting frame is threaded on the outside of the lead screw. The connecting frame is U-shaped in general and its end is telescopic, and its telescopic end is fixedly connected to the connecting block.

[0015] In some embodiments, an electric actuator is provided on the outside of the tank in the scum zone, and a connecting support is provided at the output end of the electric actuator, the connecting support being fixedly connected to the scum removal plate.

[0016] In some embodiments, the sides of the extension plate and the movable frame that are close to each other are made of magnetic material that attracts each other.

[0017] This invention has at least the following beneficial effects:

[0018] 1. The following mobile unit consists of two mobile frames, which adopt a synchronous reverse movement design and form a composite scum scraping structure with the scraper. When the upper mobile frame moves towards the scum area with the scraper, the lower mobile frame moves in the opposite direction. Its one-way push plate retracts to form a water flow channel. The pressure difference is used to guide the surface scum towards the scum scraping area, thereby improving the scum collection efficiency.

[0019] 2. The height of the mobile frame can be adjusted by the chute device to ensure the best slag scraping effect at different water levels. At the same time, each mobile frame is equipped with multiple unidirectional push plates arranged in a linear array to ensure that the push plates are always in effective contact with the scum layer during the slag scraping process, while reducing water flow disturbance during resetting. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of another method structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the side sectional structure of the box body of the present invention;

[0023] Figure 4 This is a schematic diagram of the scraper structure of the present invention;

[0024] Figure 5 This is a schematic cross-sectional view of the scraper structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the slag removal plate structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the following mobile unit structure of the present invention;

[0027] Figure 8 For the present invention Figure 7 Schematic diagram of a partial structure;

[0028] Figure 9 This is a schematic diagram of the structure at the mounting block of the present invention;

[0029] Figure 10 This is a schematic diagram of the structure of the movable frame of the present invention;

[0030] Figure 11 This is a schematic diagram of the unidirectional push plate structure of the present invention;

[0031] Figure 12 For the present invention Figure 11 A schematic diagram of the structure from another angle.

[0032] In the diagram: 1. Box body; 2. Baffle plate; 3. Separation zone; 4. Scum zone; 5. Scraper; 6. Follow-up moving unit; 61. Moving frame; 611. Frame body; 612. One-way push plate; 613. Rotating seat; 614. Limiting plate; 615. Fixing block; 7. Scum removal plate; 8. Rotating shaft; 9. Slide chute; 10. Mounting block; 11. Horizontal plate; 12. Limiting column; 13. Traction rope sleeve; 14. Connecting block; 15. Extension plate; 16. Spring; 17. Lead screw; 18. Connecting frame; 19. Electric actuator; 20. Connecting support. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1: Please refer to Figures 1-12 This invention provides a technical solution: a wastewater treatment device for glass edging processing, comprising a tank 1 for holding glass edging wastewater. This wastewater mainly originates from glass cutting, edging, drilling, and other processing steps, as well as the cooling water circulation system of the edging equipment. These processes require a large amount of water for cooling and lubrication of the glass, while also carrying away glass dust and debris generated during grinding. The wastewater has a high suspended solids content and high recyclability, thus requiring treatment. Specifically, the wastewater in the tank 1 is mixed with a coagulant to generate precipitates, which are then carried to the surface by air flotation. The addition and mixing of the coagulant and the specific structure of the air flotation are existing technologies and will not be elaborated here. A partition 2 is installed inside the tank 1, with an inclined top, dividing the tank 1 into a separation zone 3 and a scum zone 4. The wastewater in the separation zone 3 is mixed with a flocculant and then the scum is carried upwards by air flotation. The scum zone 4 collects the scum. The device also includes:

[0035] The scraper 5 is movably positioned above the separation zone 3 and can move above the tank 1 to scrape away the scum inside the tank 1. The scraper 5 moves cyclically on the tank and can continuously scrape away the waste residue on the surface of the wastewater inside the tank 1, thereby moving the waste residue to the partition 2.

[0036] The following moving unit 6 includes two moving frames 61, which are movably arranged inside the housing 1 and located in the separation zone 3. The two moving frames 61 are respectively arranged on both sides of the separation zone 3. Specifically, one moving frame 61 is close to the scum zone 4, and the other moving frame 61 is on the other side of the separation zone 3. When scraping scum, the moving frame 61 away from the scum zone 4 moves synchronously with the scraper 5. During the scraping process, the moving frame 61 is always located directly below the scraper 5 in the scraping state. The two move synchronously to hang scum. The two moving frames 61 are set to move synchronously in opposite directions. That is, when one moving frame 61 follows the scraper 5 to scrape scum, the other moving frame 61 also moves in the opposite direction to the moving frame 61 that is hanging scum, i.e., opposite to the direction of scraping scum. In this way, the moving frame 61 will form a low-pressure zone behind it, which can promote the scum that has not yet been scraped to flow towards the low-pressure zone, thereby improving the scum collection effect.

[0037] It should be noted that the moving speed of the moving frame 61 should not be too fast, that is, the speed of the scraper 5 should be moderate. This ensures the collection of scum while also preventing the flocs from being broken.

[0038] The slag removal plate 7 is movably positioned above the partition plate 2 and its moving direction is consistent with the upward tilting direction of the partition plate 2. It can transfer the slag scraped to the partition plate 2 to the slag area 4. The partition plate 2 is inclined. Thus, through the movement of the scraper 5 and the moving frame 61, the slag is pushed to the top of the inclined section of the partition plate 2, and then the slag removal plate 7 moves to scrape it, scraping the slag along the partition plate 2 to the slag area 4.

[0039] When treating wastewater, the glass edging wastewater is placed in tank 1. After the wastewater and coagulant react to form precipitate, the precipitate and scum rise to the water surface through air flotation. A recirculating scraper 5 is set above the separation zone 3 to scrape the surface scum of the wastewater to the baffle 2. At the same time, two moving frames 61 set on both sides of the separation zone 3 move synchronously in opposite directions. The moving frame 61 away from the scum zone 4 moves synchronously with the scraper 5 and is always located directly below the scraper 5. During the scraping, a low-pressure zone is formed behind the moving frame 61, which causes the scum that is not scraped to flow towards the low-pressure zone, improving the scum collection effect. The moving speed of the moving frame 61 should be moderate to avoid the flocs breaking. Finally, the scum removal plate 7 set above the baffle 2 moves along the inclined direction of the baffle 2 to transfer the scum scraped to the baffle 2 to the scum zone 4.

[0040] Rotating shafts 8 are rotatably mounted on both sides of the tank 1. Both rotating shafts 8 are located within the separation zone 3. Sprockets are mounted on the outer sides of both ends of the rotating shafts 8, and chains are mounted on the outer sides of the sprockets. The two rotating shafts 8 are synchronously driven by the chains. The scraper 5 is mounted on the chains and moves synchronously with the chains, thereby realizing the cyclical movement of the scraper 5 above the separation zone 3, thus achieving continuous sludge scraping. The rotating shafts 8 are driven by a motor located on the outer side of the tank 1, which causes the two rotating shafts 8 to rotate synchronously, driving the chain to make the scraper 5 move continuously above the tank 1, achieving the effect of continuous sludge scraping. The moving speed of the scraper 5 is adjusted according to the content of floating sludge in the wastewater. Specifically, a sensor can be installed inside the tank 1 to detect the wastewater concentration, and the motor speed can be adjusted based on the information fed back by the sensor, thereby adjusting the moving speed of the scraper 5.

[0041] Depending on the different glass processing steps, such as coarse grinding and fine grinding, the content of debris in the wastewater varies. Sensors are installed inside the tank 1 to monitor the debris content in the wastewater, thereby adjusting the amount of flocculant to be added and the moving speed of the scraper 5. The speed of scraping off scum can be adjusted for different working conditions to ensure the stable operation of the wastewater treatment system.

[0042] Both sides of the inner wall of the housing 1 are provided with sliding grooves 9. Mounting blocks 10 are slidably mounted within the sliding grooves 9 and can move within them. A horizontal plate 11 is fixedly connected to the mounting block 10. The height of the horizontal plate 11 can be adjusted by adjusting the position of the mounting block 10 within the sliding groove 9. Limiting posts 12 are provided on both sides of the horizontal plate 11. A traction rope sleeve 13 is fitted around the outer side of each limiting post 12, and a limiting block is provided at the end of each limiting post 12. The limiting block is disc-shaped to prevent the traction rope sleeve 13 from detaching from the limiting post 12. Two connecting blocks 14 are provided on the outer side of the traction rope sleeve 13. 14 Divide the traction rope loop 13 into equal parts. When one connecting block 14 is directly below the initial position of a scraper 5, the other connecting block 14 is located in the area close to the scum zone 4. Thus, the two connecting blocks 14 are located on the upper and lower sides of the traction rope loop 13 respectively. When one connecting block 14 moves, it can drive the other connecting block 14 to move through the traction rope loop 13. Since the two connecting blocks 14 are one above the other, the two connecting blocks 14 move synchronously in opposite directions. The two moving frames 61 are connected to the two connecting blocks 14 respectively, thus enabling the two moving frames 61 to move synchronously in opposite directions.

[0043] Multiple threaded holes are provided on the inner wall of the chute 9. The mounting block 10 is installed in the chute 9 by bolts. When the liquid level in the tank 1 changes, the position of the mounting block 10 can be adjusted according to the liquid level. The adjustment method is simple. Just remove the bolts and readjust the installation position of the bolts. Then adjust the position of the horizontal plate 11, the limiting post 12, the traction rope sleeve 13 and the connecting block 14, and thus adjust the height of the moving frame 61.

[0044] The mobile frame 61 includes a frame 611 on which multiple one-way push plates 612 are arranged in a linear array. Two frames 611 are arranged vertically, and the one-way push plates 612 on the two frames 611 are staggered. In the specific arrangement, the distance between adjacent one-way push plates 612 should not be too large. The specific distance can be set according to the size of the flocs that can be formed by the wastewater. When the distance between the one-way push plates 612 is too large, some scum may pass through the gap, resulting in poor scum scraping effect. In addition, although there are gaps between the one-way push plates 612, when the size of the gaps is relatively reasonable, it will not affect the scum scraping effect, because the flocs will also come into contact with each other and generate friction, forming larger flocs, thereby enabling multiple flocs to move synchronously.

[0045] A rotating seat 613 is fixedly mounted on the frame 611. A one-way push plate 612 is rotatably mounted on the rotating seat 613. A limit plate 614 is fixedly mounted on one side of the rotating seat 613 to ensure that the one-way push plate 612 remains vertical when the frame 611 moves in the direction of slag scraping within the box 1, thus ensuring smooth slag scraping. When the frame 611 resets, the one-way push plate 612 rotates due to water resistance to prevent it from carrying scum back. A fixing block 615 is fixedly mounted on the other side of the rotating seat 613 to prevent the one-way push plate 612 from rotating to a horizontal position, which would prevent it from being unable to operate under resistance. To return to a vertical position, the one-way push plate 612 and the frame 611 cannot be parallel; they must form a certain angle, which must be acute. When the frame 611 resets, the one-way push plate 612 is tilted. As the frame 611 moves along the slag scraping direction, its tilted surface comes into contact with the water flow, generating resistance. This resistance causes the one-way push plate 612 to return to a vertical position. The combination design of the limiting plate 614 and the fixing block 615 mechanically limits the swing angle of the push plate, ensuring the rigid support of the push plate during slag scraping while allowing the push plate to naturally fold due to fluid resistance during reset, reducing the amount of slag carried back.

[0046] An extension plate 15 is slidably disposed inside the scraper 5. A spring 16 is disposed at one end of the extension plate 15 inside the scraper 5, and the other end of the spring 16 is connected to the inside of the scraper 5. Since this application adopts a design in which the upper scraper 5 and the moving frame 61 cooperate to scrape slag, there is a gap between the scraper 5 and the moving frame 61. The extension plate 15 can compensate for the gap between the two and prevent slag from flowing away from the gap. Although this application also adopts a telescopic structure at the end of the scraper 5, that is, an extension plate 15 is provided, the connection between the extension plate 15 and the scraper 5 is very simple, that is, it is connected by the spring 16. The two do not require precise transmission and cooperation, which can greatly reduce the impact of slag on it.

[0047] A motor is installed on the outside of the housing 1, and a lead screw 17 is installed at the output end of the motor. The lead screw 17 is rotatably installed on the outside of the housing 1, and a connecting frame 18 is threaded on the outside of the lead screw 17. When the motor drives the lead screw 17 to rotate, the lead screw 17 drives the connecting frame 18 to move. The connecting frame 18 is U-shaped and its end is telescopic. Its telescopic end is fixedly connected to the connecting block 14. Since the mounting block 10 can drive the position of the crossbar 11, the connecting frame 18 needs to be set to telescopic to match the movement adjustment of the mounting block 10. The lead screw 17 drives the connecting frame 18 to move, and the connecting frame 18 drives the connecting block 14 to move. The two connecting blocks 14 move synchronously in opposite directions.

[0048] When scraping scum, when scraper 5 starts scraping scum, moving frame 61 also starts from its initial position. By controlling the motor, scraper 5 and moving frame 61 can be kept in contact during scraping. In this way, when scraper 5 moves, one of the moving frames 61 moves synchronously with it to scrape scum. In actual use, the moving frame 61 is located on the upper surface of the water surface and can follow the movement of scraper 5 to move the scum. When this moving frame 61 moves towards the scum area 4, the other moving frame 61 will also move in the opposite direction to the scraper 5. However, at this time, the one-way push plate 612 on this moving frame 61 is retracted, so it will not bring back too much scum. And because the moving plate can form a low-pressure area behind it when it moves, the water in the tank 1 will flow towards the low-pressure area under the action of pressure difference, which can drive the scum on the surface towards the scum area 4. The two moving frames 61 moving in opposite directions can maintain the balance of shear force and avoid the shearing effect of one-way movement on the flocs.

[0049] An electric actuator 19 is installed on the outside of the housing 1 at the scum zone 4. A connecting support 20 is installed at the output end of the electric actuator 19. The connecting support 20 is fixedly connected to the scum removal plate 7. When the scum is pushed close to the partition 2, the electric actuator 19 is activated to drive the scum removal plate 7 to move and push the scum along the inclined section above the partition 2 to the scum zone 4.

[0050] Example 2: The present invention provides a technical solution: Based on Example 1, the sides of the extension plate 15 and the movable frame 61 that are close to each other are both made of magnetic material that attracts each other. When the scraper 5 and the movable frame 61 move synchronously to scrape slag, the magnetic attraction between the two can make the extension plate 15 abut against the movable frame 61, thereby compensating for the gap between the two, preventing the slag from passing through the gap between the two, and ensuring the slag scraping effect.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A wastewater treatment device for edging in glass product processing, comprising a tank (1), wherein a partition (2) is provided inside the tank (1), the partition (2) dividing the tank (1) into a separation zone (3) and a scum zone (4), characterized in that: It also includes a scraper (5) that is movably disposed above the separation zone (3), and a following moving unit (6) that is movably disposed in the separation zone (3), which includes two moving frames (61) and the two moving frames (61) are respectively located at both ends of the separation zone (3), and a slag removal plate (7) is disposed above the partition (2).

2. The wastewater treatment equipment for glass product processing according to claim 1, characterized in that: The box (1) has rotating shafts (8) on both sides. Both rotating shafts (8) are located in the separation zone (3). Both ends of the rotating shafts (8) are equipped with sprockets, and chains are provided on the outside of the sprockets. The two rotating shafts (8) are driven synchronously by the chains. The scraper (5) is set on the chain and moves synchronously with the chain.

3. The wastewater treatment equipment for glass product processing edge grinding according to claim 1, characterized in that: The inner walls of both sides of the box (1) are provided with sliding grooves (9), and mounting blocks (10) are slidably arranged in the sliding grooves (9). A horizontal plate (11) is fixedly connected to the mounting block (10). Limiting posts (12) are provided on both sides of the horizontal plate (11). A traction rope sleeve (13) is sleeved on the outside of the two limiting posts (12). Two connecting blocks (14) are provided on the outside of the traction rope sleeve (13). The two connecting blocks (14) divide the traction rope sleeve (13) equally. The two moving frames (61) are respectively connected to the two connecting blocks (14).

4. The wastewater treatment equipment for glass product processing according to claim 3, characterized in that: The inner wall of the slide (9) is provided with multiple threaded holes, and the mounting block (10) is installed in the slide (9) by bolts.

5. The wastewater treatment equipment for glass product processing edge grinding according to claim 1, characterized in that: The mobile frame (61) includes a frame (611) on which a plurality of one-way push plates (612) are provided. The plurality of one-way push plates (612) are arranged in a linear array on the frame (611). Two frames (611) are arranged vertically, and the one-way push plates (612) on the two frames (611) are staggered.

6. The wastewater treatment equipment for glass product processing according to claim 5, characterized in that: A rotating seat (613) is fixedly installed on the frame (611), and the one-way push plate (612) is rotatably installed on the rotating seat (613). A limit plate (614) is fixedly installed on one side of the rotating seat (613) so that the one-way push plate (612) can remain vertical when the frame (611) drives the one-way push plate (612) to move in the direction of slag scraping in the box (1). A fixing block (615) is fixedly installed on the other side of the rotating seat (613).

7. The wastewater treatment equipment for glass product processing edge grinding according to claim 1, characterized in that: An extension plate (15) is slidably disposed inside the scraper (5). A spring (16) is disposed at one end of the extension plate (15) inside the scraper (5), and the other end of the spring (16) is connected to the inside of the scraper (5).

8. The wastewater treatment equipment for glass product processing according to claim 3, characterized in that: A motor is provided on the outside of the box (1), and a lead screw (17) is provided at the output end of the motor. The lead screw (17) is rotatably provided on the outside of the box (1), and a connecting frame (18) is threaded on the outside of the lead screw (17). The connecting frame (18) is U-shaped and its end is telescopic, and its telescopic end is fixedly connected to the connecting block (14).

9. The wastewater treatment equipment for glass product processing edge grinding according to claim 1, characterized in that: An electric actuator (19) is provided on the outside of the box (1) at the scum area (4). A connecting support (20) is provided at the output end of the electric actuator (19). The connecting support (20) is fixedly connected to the scum removal plate (7).

10. The wastewater treatment equipment for glass product processing according to claim 7, characterized in that: The sides of the extension plate (15) and the movable frame (61) that are close to each other are both made of magnetic material that attracts each other.

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