Electrolytic bath end side wall temperature measuring device

Abstract

The utility model discloses a temperature measuring device for the side wall of an end of an electrolytic bath, and relates to the technical field of electrolytic baths. The temperature measuring mechanism is fixed to the top of the electrolytic bath and comprises a moving assembly fixed to the top of the electrolytic bath, an adjusting assembly is fixed to the moving assembly, a fixing plate is fixed to the adjusting assembly, a temperature sensor is installed on the fixing plate, a driving part is installed on the fixing plate and the adjusting assembly, and a brush frame is fixed to the lower end of the driving part; a rail is arranged on one side of the moving assembly and matched with the driving part, and a stirring paddle is fixed to the outer surface of the brush frame. Under the cooperation of the moving assembly, the adjusting assembly, the fixing plate, the driving piece, the brush frame and the track, multi-point temperature capture of the sensor can be achieved, the overall temperature field distribution of the side wall can be better reflected, the sensor can be cleaned, the situation that impurities which are soaked in electrolyte for a long time deposit and cover the surface of the sensor is reduced, and the service life of the sensor is prolonged. And the temperature response sensitivity is ensured.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic cell technology, and in particular to a temperature measuring device for the end wall of an electrolytic cell. Background Technology

[0002] Electrolytic cells are core electrochemical devices that convert electrical energy into chemical energy. They achieve the decomposition or synthesis of substances through oxidation-reduction reactions driven by direct current. Temperature measurement of the sidewalls at the ends of electrolytic cells is a crucial link in ensuring safe production. Early warning of melt leakage: Abnormally high temperatures on the sidewalls of electrolytic cells are usually a precursor to leakage (molten electrolyte or metal penetrating the cell shell). Real-time monitoring can detect the risk of cell lining damage, lining corrosion, or sidewall burn-through in advance, avoiding catastrophic accidents such as explosions and fires caused by high-temperature melt leakage. Avoiding short-circuit risks: Uneven distance between anode and cathode or anode granulation can lead to local current concentration, causing sidewall short circuits and generating high temperatures. Temperature measurement systems can quickly locate abnormal heating points, preventing electrode burn-out or equipment damage.

[0003] However, in practical applications, there are still some unresolved problems. The following are some common problems of the temperature measurement device on the side wall of the electrolytic cell end: In most cases, the sensor used to monitor the temperature is fixed in one position. The fixed sensor can only capture the temperature at a local point and cannot reflect the overall temperature field distribution of the side wall, which leads to the failure to detect abnormal hot spots. Moreover, after being immersed in the electrolyte for a long time, the deposits of impurities will cover the sensor surface, forming a heat insulation layer, which significantly reduces the temperature response sensitivity and produces errors. Utility Model Content

[0004] In view of the problems existing in the above-mentioned temperature measuring devices for the end wall of electrolytic cells, this utility model is proposed.

[0005] Therefore, the problem to be solved by this utility model is how to solve the problem that in most cases, temperature sensors used for monitoring are fixed in one position, and fixed-position sensors can only capture the temperature of local points and cannot reflect the overall temperature field distribution of the side wall. Furthermore, when immersed in electrolyte for a long time, impurities will accumulate and cover the sensor surface, forming a heat insulation layer.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a temperature measuring device for the side wall of an electrolytic cell end, comprising,

[0007] Electrolytic cell; and,

[0008] A temperature measuring mechanism, fixed to the top of an electrolytic cell, includes a movable component fixed to the top of the electrolytic cell, an adjustment component fixed on the movable component, a fixed plate fixed on the adjustment component, a temperature sensor mounted on the fixed plate, a driving component mounted on the fixed plate and the adjustment component, a brush frame fixed to the lower end of the driving component, a track opened on one side of the movable component and cooperating with the driving component, and a stirring paddle fixed to the outer surface of the brush frame.

[0009] As a preferred embodiment of the electrolytic cell end wall temperature measuring device of this utility model, the moving component includes a housing fixed to the top of the electrolytic cell, a servo motor fixed to one side of the housing, a lead screw rotating on the inner wall of the housing, one end of which is fixed to the output shaft of the servo motor, a moving block sliding on the housing and threadedly connected to the lead screw, an adjusting component fixed to one side of the moving block, and a track opened on one side of the housing.

[0010] As a preferred embodiment of the electrolytic cell end sidewall temperature measuring device of the present invention, the adjusting component includes a connecting plate fixed to one side of the moving block, a vertical plate sliding on the connecting plate, a limit hole and a slot respectively opened on the surface of the vertical plate, and a fixing member installed at one end of the connecting plate, which cooperates with the slot.

[0011] In a preferred embodiment of the electrolytic cell end wall temperature measuring device of this utility model, a pull ring is fixed at the upper end of the vertical plate.

[0012] As a preferred embodiment of the electrolytic cell end sidewall temperature measuring device of the present invention, the fixing member includes a clamping rod that slides on the connecting plate and cooperates with the clamping groove. One end of the clamping rod is fixed with a pull plate, and a spring is sleeved on the surface of the clamping rod. Both ends of the clamping rod are fixed to the surface of the connecting plate and the surface of the pull plate, respectively.

[0013] As a preferred embodiment of the electrolytic cell end sidewall temperature measuring device of this utility model, a limiting groove is provided in the connecting plate, a limiting block is fixed on the clamping rod, and the limiting block slides in the limiting groove.

[0014] As a preferred embodiment of the electrolytic cell end sidewall temperature measuring device of this utility model, the driving component includes a slider that slides in a limiting hole, a circular frame fixed at one end of the slider, a rotating ring rotating on the inner wall of the circular frame, a vertical rod sliding on the fixed plate, and its two ends being fixed to the bottom of the rotating ring and the top of the brush frame, respectively, a short block fixed on the outer surface of the circular frame, a movable block sliding on the short block, a short column fixed on the upper surface of the movable block, and one end of the column sliding in a track.

[0015] As a preferred embodiment of the electrolytic cell end sidewall temperature measuring device of this utility model, wherein: a fixing bolt is threadedly connected to one side of the short block, and one end of the bolt is in contact with the surface of the movable block.

[0016] As a preferred embodiment of the electrolytic cell end sidewall temperature measuring device of the present invention, wherein: a collar is fixed on the outer surface of the vertical rod, a guide groove is opened on the outer surface of the collar, a fixing block is fixed on the top of the fixing plate, a guide post is fixed on the upper surface of the fixing block, and one end of the guide post slides in the guide groove.

[0017] In a preferred embodiment of the electrolytic cell end wall temperature measuring device of this utility model, an alarm and a controller are respectively fixed on the top of the housing.

[0018] The beneficial effects of this utility model are as follows: by cooperating with the moving component, adjusting component, fixing plate, driving component, brush frame and track, it is possible to achieve multi-point temperature capture of the sensor, better reflect the overall temperature field distribution of the side wall, and clean the sensor, reducing the situation where impurities are deposited and cover the sensor surface after long-term immersion in electrolyte, thus ensuring temperature response sensitivity. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the temperature measuring device on the side wall of the electrolytic cell end.

[0021] Figure 2 Temperature measuring device for the side wall of the electrolytic cell end Figure 1 Enlarged view of region A in the middle.

[0022] Figure 3 A sectional perspective view of the moving component of the temperature measuring device on the side wall of the electrolytic cell end.

[0023] Figure 4 This is a sectional plan view of the connecting plate and vertical plate of the temperature measuring device on the side wall of the electrolytic cell end.

[0024] Figure 5 A three-dimensional view showing the separation of the vertical rod and fixing plate of the temperature measuring device on the side wall of the electrolytic cell end.

[0025] Figure 6 Temperature measuring device for the side wall of the electrolytic cell end Figure 4 Enlarged view of region B in the middle.

[0026] In the diagram: 1. Electrolytic cell; 2. Temperature measuring mechanism; 21. Moving component; 22. Adjusting component; 23. Fixing plate; 24. Temperature sensor; 25. Driving component; 26. Brush frame; 27. Track; 28. Stirring paddle; 29. ​​Alarm; 210. Controller; 21-1. Housing; 21-2. Servo motor; 21-3. Lead screw; 21-4. Moving block; 22-1. Connecting plate; 22-2. Vertical plate; 22-3. Limiting hole; 22-4. Slot; 22-5 22-56. Fixing component; 22-57. Pull ring; 22-58. Locking rod; 22-59. Pull plate; 22-50. Spring; 22-51. Limiting groove; 22-52. Limiting block; 25-1. Sliding block; 25-2. Circular frame; 25-3. Rotary ring; 25-4. Vertical rod; 25-5. Short block; 25-6. Movable block; 25-7. Short column; 25-8. Fixing bolt; 25-9. Collar; 25-10. Guide groove; 25-11. Fixing block; 25-12. Guide post. Detailed Implementation

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0030] Example 1

[0031] Reference Figure 1 and Figure 2 This is the first embodiment of the present invention. This embodiment provides a temperature measuring device for the end wall of an electrolytic cell. The temperature measuring device for the end wall of an electrolytic cell includes an electrolytic cell 1 and a temperature measuring mechanism 2. The temperature measuring mechanism 2 can realize multi-point temperature capture of the sensor and can clean the sensor, reducing the situation where impurities are deposited and cover the sensor surface after long-term immersion in electrolyte.

[0032] Specifically, electrolytic cell 1 is existing technology, and the working principle of this part is also existing technology, which can be clearly understood by those skilled in the art, and will not be described in detail here.

[0033] Specifically, the temperature measuring mechanism 2 is fixed to the top of the electrolytic cell 1, including a movable component 21 fixed to the top of the electrolytic cell 1. The movable component 21 enables the movement of the adjustment component 22, the fixing plate 23, and the temperature sensor 24, thereby allowing the temperature sensor 24 to measure the temperature of the side wall area at the end. The movable component 21 is fixed with the adjustment component 22, which allows the height of the fixing plate 23 to be adjusted, thereby adjusting the depth of the temperature sensor 24 inserted into the electrolyte in the electrolytic cell 1 to meet different usage requirements.

[0034] A fixing plate 23 is fixed on the adjusting assembly 22, and a temperature sensor 24 is installed on the fixing plate 23. A driving component 25 is installed on the fixing plate 23 and the adjusting assembly 22. With the setting of the driving component 25, under the action of moving with the fixing plate 23 and the adjusting assembly 22, and with the cooperation of the track 27, the brush frame 26 rotates during the up and down movement, thereby making the bristles on the brush frame 26 clean the lower end of the temperature sensor 24, so as to prevent particles in the electrolyte from adhering to its surface and affecting normal temperature monitoring.

[0035] A brush frame 26 is fixed at the lower end of the drive component 25. A track 27 is provided on one side of the moving component 21 and it cooperates with the drive component 25. An agitator 28 is fixed on the outer surface of the brush frame 26. Multiple agitators 28 are provided on one brush frame 26. The agitators 28 move up and down and rotate with the brush frame 26 to stir the electrolyte around the temperature sensor 24, ensuring that the temperature in the vicinity is uniform during monitoring and improving the accuracy of temperature monitoring.

[0036] Example 2

[0037] Reference Figures 1-6 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0038] Specifically, the moving component 21 includes a housing 21-1 fixed to the top of the electrolytic cell 1, a servo motor 21-2 fixed to one side of the housing 21-1, a lead screw 21-3 rotating on the inner wall of the housing 21-1, one end of which is fixed to the output shaft of the servo motor 21-2, and one end of the lead screw 21-3 is rotatably connected to the housing 21-1 through a bearing. A moving block 21-4 slides on the housing 21-1 and is threadedly connected to the lead screw 21-3. An adjustment component 22 is fixed to one side of the moving block 21-4. A track 27 is opened on one side of the housing 21-1. The servo motor 21-2 drives the lead screw 21-3 to rotate forward and backward, thereby driving the moving block 21-4 to move laterally back and forth, thereby causing the adjustment component 22, the fixed plate 23 and the temperature sensor 24 to move laterally back and forth.

[0039] The adjustment assembly 22 includes a connecting plate 22-1 fixed to one side of the moving block 21-4. A vertical plate 22-2 slides on the connecting plate 22-1, passing through the connecting plate 22-1 and slidably connected to it. Limiting holes 22-3 and slots 22-4 are respectively opened on the surface of the vertical plate 22-2. A fixing member 22-5 is installed at one end of the connecting plate 22-1 and cooperates with the slot 22-4. Multiple slots 22-4 are provided on the connecting plate 22-1. By inserting the locking rod 22-51 on the fixing member 22-5 into different slots 22-4, the height position of the adjusted vertical plate 22-2 and the fixing plate 23 is limited, thereby adjusting the depth of the temperature sensor 24 inserted into the electrolyte. Through the setting of the limiting hole 22-3, the slider 25-1 is limited on the vertical plate 22-2, and the slider 25-1 can move on the vertical plate 22-2.

[0040] A pull ring 22-6 is fixed to the upper end of the vertical plate 22-2. By pulling the pull ring 22-6, it is easy to move the vertical plate 22-2 on the connecting plate 22-1, which is more labor-saving and convenient to operate.

[0041] The fixing component 22-5 includes a locking rod 22-51 that slides on the connecting plate 22-1 and cooperates with the locking groove 22-4. One end of the locking rod 22-51 is chamfered. By setting it, the locking rod 22-51 can be inserted into the locking groove 22-4 more smoothly. One end of the locking rod 22-51 is fixed with a pull plate 22-52. A spring 22-53 is sleeved on the surface of the locking rod 22-51, and its two ends are fixed to the surface of the connecting plate 22-1 and the surface of the pull plate 22-52, respectively.

[0042] When it is necessary to adjust the height of the vertical plate 22-2, the fixed plate 23, and the temperature sensor 24, first release the fixing bolt 25-8 from the movable block 25-6 so that the height adjustment of the vertical plate 22-2 and the fixed plate 23 is not affected. Pull the pull plate 22-52 to move the locking rod 22-51 away from the original slot 22-4, so that the spring 22-53 is stretched, and the vertical plate 22-2 and the fixed plate 23 are moved up and down. After the adjustment is completed, after the locking rod 22-51 is aligned with the slot 22-4, release the pull plate 22-52. Under the action of the spring 22-53, the locking rod 22-51 is inserted into the slot 22-4, thereby limiting and fixing the vertical plate 22-2 and the fixed plate 23.

[0043] A limiting groove 22-54 is provided in the connecting plate 22-1, and a limiting block 22-55 is fixed on the clamping rod 22-51 and slides in the limiting groove 22-54. The limiting groove 22-54 and the limiting block 22-55 guide and limit the clamping rod 22-51 so that the clamping rod 22-51 will not detach from the connecting plate 22-1 when it moves.

[0044] The driving component 25 includes a slider 25-1 that slides within the limiting hole 22-3. A circular frame 25-2 is fixed to one end of the slider 25-1. A rotating ring 25-3 rotates on the inner wall of the circular frame 25-2. The rotating ring 25-3 is rotatably connected to the circular frame 25-2 via a bearing. A vertical rod 25-4 slides on the fixed plate 23, and its two ends are fixed to the bottom of the rotating ring 25-3 and the top of the brush frame 26, respectively. A short block 25-5 is fixed to the outer surface of the circular frame 25-2. A movable block 25-6 slides on the short block 25-5. A short column 25-7 is fixed to the upper surface of the movable block 25-6, and one end of the column slides within the track 27.

[0045] The circular frame 25-2 is guided and limited by the limiting block 22-55 and the limiting hole 22-3. The rotating ring 25-3 and the brush frame 26 are indirectly connected by the vertical rod 25-4, so that when the rotating ring 25-3 moves up and down, it can drive the brush frame 26 to move up and down. At the same time, when the vertical rod 25-4 rotates, it can drive the rotating ring 25-3 and the brush frame 26 to rotate. The movable block 25-6 passes through the short block 25-5 and is slidably connected to it.

[0046] The movable block 25-6 and the short block 25-5 can be fixed together by fixing bolt 25-8. After unlocking and fixing, the position of the movable block 25-6 on the short block 25-5 can be adjusted so that the adjustment component 22 is not affected during adjustment. With the setting of track 27, when the short column 25-7 moves in it, the movable block 25-6, the short block 25-5 and the circular frame 25-2 can move up and down, thereby causing the rotating ring 25-3, the vertical rod 25-4 and the brush frame 26 to move up and down.

[0047] The short block 25-5 has a threaded connection to a fixing bolt 25-8 on one side, and one end of the bolt is in contact with the surface of the movable block 25-6.

[0048] A collar 25-9 is fixed to the outer surface of the vertical rod 25-4. A guide groove 25-10 is provided on the outer surface of the collar 25-9. A fixing block 25-11 is fixed to the top of the fixing plate 23. A guide post 25-12 is fixed to the upper surface of the fixing block 25-11, and one end of the guide post 25-12 slides in the guide groove 25-10. With the setting of the guide groove 25-10, when the collar 25-9 moves up and down with the vertical rod 25-4, the guide post 25-12 moves in the guide groove 25-10, thereby causing the collar 25-9 to reciprocate when it moves up and down. This causes the vertical rod 25-4, the rotating ring 25-3, and the brush frame 26 to reciprocate when they move up and down, so that the brush frame 26 cleans the lower end of the temperature sensor 24 and prevents particles in the electrolyte from adhering to its surface.

[0049] An alarm 29 and a controller 210 are fixed to the top of the housing 21-1. The controller 210 is electrically connected to the alarm 29 and the temperature sensor 24. The data monitored by the temperature sensor 24 is transmitted to the controller 210. The controller 210 processes the data and compares it with the pre-set temperature range. Based on the value, it controls whether the alarm 29 is activated. This is existing technology. The working principle of this part is also existing technology and can be clearly understood by those skilled in the art. It will not be described in detail here.

[0050] In use, the servo motor 21-2 drives the lead screw 21-3 to rotate in both directions, which in turn drives the moving block 21-4 to move laterally back and forth. This causes the adjustment component 22, the fixed plate 23, the temperature sensor 24, and the drive component 25 to move laterally back and forth. When the short column 25-7 on the drive component 25 moves within the track 27, it can cause the movable block 25-6, the short block 25-5, and the circular frame 25-2 to move up and down, which in turn causes the rotating ring 25-3, the vertical rod 25-4, the collar 25-9, and the brush frame 26 to move up and down.

[0051] As the collar 25-9 moves up and down with the vertical rod 25-4, the guide post 25-12 moves within the guide groove 25-10, causing the collar 25-9 to reciprocate as it moves up and down. This, in turn, causes the vertical rod 25-4, the rotating ring 25-3, and the brush frame 26 to reciprocate as they move up and down. This allows the brush frame 26 to clean the lower end of the temperature sensor 24, preventing particles in the electrolyte from adhering to its surface. The stirring paddle 28 on the brush frame 26 moves up and down and rotates with it, agitating the electrolyte around the temperature sensor 24 to ensure uniform temperature in the vicinity during monitoring and improve the accuracy of temperature monitoring.

[0052] In summary, through the cooperation of the moving component 21, the adjusting component 22, the fixing plate 23, the driving component 25, the brush frame 26 and the track 27, multi-point temperature capture of the sensor can be achieved, better reflecting the overall temperature field distribution of the side wall, and the sensor can be cleaned, reducing the situation where impurities are deposited and cover the sensor surface after long-term immersion in electrolyte, thus ensuring temperature response sensitivity.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A temperature measuring device for the side wall of an electrolytic cell end, characterized in that: include, Electrolytic cell (1); as well as, The temperature measuring mechanism (2) is fixed to the top of the electrolytic cell (1) and includes a moving component (21) fixed to the top of the electrolytic cell (1). An adjusting component (22) is fixed on the moving component (21). A fixing plate (23) is fixed on the adjusting component (22). A temperature sensor (24) is installed on the fixing plate (23). A driving component (25) is installed on the fixing plate (23) and the adjusting component (22). A brush frame (26) is fixed at the lower end of the driving component (25). A track (27) is opened on one side of the moving component (21) and it cooperates with the driving component (25). A stirring paddle (28) is fixed on the outer surface of the brush frame (26).

2. The electrolytic cell end wall temperature measuring device as described in claim 1, characterized in that: The moving component (21) includes a housing (21-1) fixed to the top of the electrolytic cell (1), a servo motor (21-2) fixed to one side of the housing (21-1), a lead screw (21-3) rotating on the inner wall of the housing (21-1), one end of which is fixed to the output shaft of the servo motor (21-2), a moving block (21-4) sliding on the housing (21-1), and a threaded connection between the moving block (21-3) and the adjusting component (22) fixed to one side of the moving block (21-4), and a track (27) opened on one side of the housing (21-1).

3. The electrolytic cell end wall temperature measuring device as described in claim 2, characterized in that: The adjustment assembly (22) includes a connecting plate (22-1) fixed to one side of the moving block (21-4). A vertical plate (22-2) slides on the connecting plate (22-1). Limiting holes (22-3) and slots (22-4) are respectively opened on the surface of the vertical plate (22-2). A fixing member (22-5) is installed at one end of the connecting plate (22-1) and it cooperates with the slot (22-4).

4. The electrolytic cell end wall temperature measuring device as described in claim 3, characterized in that: A pull ring (22-6) is fixed to the upper end of the vertical plate (22-2).

5. The electrolytic cell end wall temperature measuring device as described in claim 3, characterized in that: The fixing component (22-5) includes a locking rod (22-51) that slides on the connecting plate (22-1) and cooperates with the locking groove (22-4). One end of the locking rod (22-51) is fixed with a pull plate (22-52). A spring (22-53) is sleeved on the surface of the locking rod (22-51), and its two ends are fixed to the surface of the connecting plate (22-1) and the surface of the pull plate (22-52) respectively.

6. The electrolytic cell end wall temperature measuring device as described in claim 5, characterized in that: A limiting groove (22-54) is provided in the connecting plate (22-1), and a limiting block (22-55) is fixed on the clamping rod (22-51) and slides in the limiting groove (22-54).

7. The electrolytic cell end wall temperature measuring device as described in claim 3, characterized in that: The driving component (25) includes a slider (25-1) that slides within a limiting hole (22-3). A circular frame (25-2) is fixed to one end of the slider (25-1). A rotating ring (25-3) rotates on the inner wall of the circular frame (25-2). A vertical rod (25-4) slides on the fixing plate (23), and its two ends are fixed to the bottom of the rotating ring (25-3) and the top of the brush frame (26), respectively. A short block (25-5) is fixed to the outer surface of the circular frame (25-2). A movable block (25-6) slides on the short block (25-5). A short column (25-7) is fixed to the upper surface of the movable block (25-6), and one end of the column slides within the track (27).

8. The electrolytic cell end wall temperature measuring device as described in claim 7, characterized in that: The short block (25-5) is threaded with a fixing bolt (25-8) on one side, and one end of the bolt is in contact with the surface of the movable block (25-6).

9. The electrolytic cell end wall temperature measuring device as described in claim 7, characterized in that: A collar (25-9) is fixed to the outer surface of the vertical rod (25-4). A guide groove (25-10) is provided on the outer surface of the collar (25-9). A fixing block (25-11) is fixed to the top of the fixing plate (23). A guide post (25-12) is fixed to the upper surface of the fixing block (25-11), and one end of the guide post slides in the guide groove (25-10).

10. The electrolytic cell end wall temperature measuring device as described in claim 2, characterized in that: An alarm (29) and a controller (210) are respectively fixed on the top of the housing (21-1).

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