Acid gas protection device

Abstract

The utility model discloses an acid gas protection device, which relates to the technical field of chemical equipment, and comprises a first cover body, the first cover body is rotatably connected with a second cover body through a hinge, and the two ends inside the first cover body and the second cover body are respectively provided with an absorption device. End covers are arranged on the outer sides, in the axial extension direction of the first cover body and the second cover body, of the absorption device, and first fixing parts are arranged on the inner sides, in the axial extension direction of the first cover body and the second cover body, of the absorption device; a plurality of second fixing parts are arranged on the inner sides, in the axial extending direction of the first cover body and the second cover body, of the first fixing part, a lock catch is fixed to the outer end, away from the hinge direction, of the first cover body, and a lock pin connected with the lock catch in a clamped mode is fixed to the outer end, away from the hinge direction, of the second cover body; the acid gas absorption device is simple in structure, reasonable in design, firm in fixation, good in absorption effect and capable of effectively preventing acid gas from corroding equipment objects, and the service life of the equipment objects is remarkably prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical equipment, in particular to an acid gas protection device. BACKGROUND

[0002] Chlorinated paraffin as an important industrial chemicals, in plastics, rubber, paint, coating and many other fields have a wide range of applications, chlorinated paraffin production is mainly through the liquid paraffin and chlorine in the presence of catalyst chlorination reaction to realize, in the process, chlorine molecule and hydrogen atom in paraffin molecule replacement reaction, generate chlorinated paraffin and hydrogen chloride, at the same time, due to the different reaction conditions (such as temperature, pressure, catalyst type, etc.), it is also possible to produce a small amount of unreacted chlorine and other by-products;

[0003] However, in the chlorinated paraffin production workshop, production equipment is in acid gas environment for a long time, these acid gases are mainly from the reaction process of hydrogen chloride, chlorine and other harmful gases, long-term exposure to acid gas environment, will cause serious corrosion to the pipeline, motor and other production equipment components, shorten the service life of related equipment, not only affect the normal operation of the equipment, but also may lead to production safety accidents, the existing protection device is plastic bag or circular plastic shell cover on the equipment components that need to be protected, time long due to not firm also can cause acid gas intrusion to produce corrosion to the equipment components, at the same time, also affect the appearance, therefore, it is very necessary to provide an acid gas protection device which is reasonable in design, firm in fixation, avoids acid gas intrusion, good in adsorption effect and long in service life. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses in order to overcome prior art's insufficient, and provide an acid gas protection device which is reasonable in design, firm in fixation, avoids acid gas intrusion, good in adsorption effect and long in service life.

[0005] The utility model discloses a kind of acid gas protection devices, it includes first cover body, the first cover body is rotatably connected with second cover body by hinge, the first cover body and second cover body inside both ends are provided with absorption device, the absorption device is along the outside of first cover body and second cover body axial extension direction and is provided with end cap, the absorption device is along the inside of first cover body and second cover body axial extension direction and is provided with first fixed part, the first fixed part is along the inside of first cover body and second cover body axial extension direction and is provided with a plurality of second fixed parts, the outer end portion of the first cover body away from hinge direction is fixed with lock catch, the outer end portion of the second cover body away from hinge direction is fixed with lock pin of the lock catch is engaged, the end cap, absorption device and first cover body, second cover body between are fixedly connected.

[0006] Preferably, a through hole is arranged at the joint of the first cover body, the second cover body and the first fixing part, a first circular groove concentric with the through hole is arranged at the lower part of the through hole, the diameter of the first circular groove is larger than that of the through hole, the bottom end of the first fixing part extends through the through hole to the first circular groove and can move back and forth in the first circular groove along the axial direction of the first circular groove, and a compression spring is fixedly connected between the bottom end of the first fixing part and the bottom end of the first circular groove.

[0007] Preferably, the first fixing part comprises a first fixing shaft and a first baffle fixedly connected to the bottom end of the first fixing shaft, and a leather pad is arranged at the top end of the first fixing shaft, and the top end of the compression spring is fixedly connected to the first baffle.

[0008] Preferably, a ladder is arranged at the joint of the first circular groove and the through hole, so as to limit the movement of the first baffle along the movement direction of the first fixing shaft.

[0009] Preferably, a second circular groove is arranged at the joint of the first cover body, the second cover body and the second fixing part, a clamping ring is fixedly arranged on the inner wall of the second circular groove, the bottom end of the second fixing part passes through the clamping ring and can move back and forth in the second circular groove along the axial direction of the second circular groove, a second baffle is arranged at the bottom end of the second fixing part, and a compression spring is fixedly connected between the second baffle and the bottom end of the second circular groove.

[0010] Preferably, the second fixing part comprises a second fixing shaft, a leather pad is arranged at the top end of the second fixing shaft, two protrusions are fixedly arranged at the bottom end of the second fixing shaft, grooves corresponding to the protrusions are arranged on the clamping ring, and the protrusions of the second fixing part can pass through the grooves and enter the second circular groove.

[0011] Preferably, the first cover body and the second cover body are both semicircular structures with the same size, the first fixing part and the second fixing part are both perpendicularly connected to the inner walls of the first cover body and the second cover body, and the first fixing part and the second fixing part are both arranged in multiple rows in the first cover body and the second cover body, with the two ends of each row being provided with the first fixing part and the middle position being provided with a plurality of second fixing parts.

[0012] Preferably, the absorption device comprises a first absorption box and a second absorption box, the first absorption box and the second absorption box are both circular arc structures concentric with the first cover body and the second cover body, the bottom end of the second absorption box is fixedly connected to the first cover body and the second cover body, the bottom end of the first absorption box is fixedly connected to the top end of the second absorption box, arc cavities are arranged in the first absorption box and the second absorption box, activated carbon is filled in the arc cavity of the first absorption box, alkali solution absorption cotton is filled in the arc cavity of the second absorption box, a plurality of adsorption holes are arranged on the outer side of the first absorption box and the second absorption box, and sealing covers are arranged on the top parts of the arc cavities of the first absorption box and the second absorption box.

[0013] Preferably, the outer surfaces of the first cover body and the second cover body are each sprayed with a phenolic acid-resistant paint.

[0014] Preferably, the end cover is provided with an arc-shaped transparent observation window.

[0015] The utility model has the advantages that:

[0016] 1. The utility model discloses a first fixed part and a second fixed part are designed, when protecting the protected object, the first cover body and the second cover body surround the object and fold, the first fixed part first contacts the protected object, the protected object is extruded the first fixed part and then extrudes the compression spring connected with the first fixed part, then the lock catch of the first cover body and the lock pin of the second cover body are connected and locked, through the extrusion force of the compression spring, the position of the first cover body and the second cover body can be fixed, the movement or falling of the protection device is avoided, when the structure of the protected object is uneven, such as narrow in the middle and wide on both sides, or the diameter of the protected object is large and long, a certain number of second fixed parts can be manually added, the second fixed part can be extruded and contacted with the middle part of the protected object, the fixing effect of the protection device is further enhanced, and the use range of the protection device is also expanded.

[0017] 2. The utility model discloses an absorption device, the lye absorption cotton in the absorption device can absorb the acidic gas permeating into the inside of the protection device and carry out neutralization reaction, the activated carbon in the absorption device can also adsorb the residual acidic gas, the adsorption effect is further improved, the corrosion and damage of the acidic gas to the protected object are effectively avoided, and the service life is prolonged.

[0018] 3. The utility model discloses the combination mode of the lock catch and the lock pin, which facilitates the locking and opening of the protection device, improves the installation efficiency of the protection device, and facilitates the timely replacement of the activated carbon and the lye absorption cotton and equipment maintenance.

[0019] 4. The design of the upper end cover of the first cover body and the second cover body can further avoid the entry of acidic gas from the outside, and significantly improve the protection effect.

[0020] Overall, the utility model has the advantages of simple structure, reasonable design, firm fixation, good adsorption effect, effective avoidance of the corrosion of acidic gas to equipment objects, and significant improvement of the service life of equipment objects. DRAWINGS

[0021] Figure 1 It is the three-dimensional structure schematic diagram of the utility model.

[0022] Figure 2 It is the three-dimensional structure schematic diagram of the lower half of the utility model.

[0023] Figure 3 is the three-dimensional structure schematic view of the second cover body of the utility model.

[0024] Figure 4 is the three-dimensional structure schematic view of the absorption device of the utility model.

[0025] Figure 5 is the structure schematic view of the internal connection of the first fixed part of the utility model.

[0026] Figure 6 is the structure schematic view of the internal connection of the second fixed part of the utility model.

[0027] Figure 7 is the structure schematic view of the second fixed part of the utility model.

[0028] Figure 8 is the explosion schematic view of the internal connection of the second fixed part of the utility model.

[0029] Figure 9 is the cross section schematic view of the utility model.

[0030] Figure 10 is the structure schematic view of the observation window of the utility model.

[0031] In the drawing: 1. first cover body 2. second cover body 3. absorption device 301. sealing cover 302. first absorption box 303. second absorption box 304. arc cavity 305. adsorption hole 4. first fixed part 401. first fixed shaft 402. first baffle 5. second fixed part 501. second fixed shaft 502. protrusion 6. end cover 7. lock catch 8. lock pin 9. hinge 10. through hole 11. second circular groove 12. clamping ring 1201. recess 13. leather pad 14. compression spring 15. second baffle 16. first circular groove 17. ladder 18. observation window. DETAILED DESCRIPTION

[0032] The following is the specific embodiment of the utility model, and the technical scheme of the utility model is further described in combination with the drawings, but the utility model is not limited to these embodiments.

[0033] Embodiment one:

[0034] As Figures 1-9As shown, an acid gas protection device, it includes the first cover body 1, the second cover body 2 is rotatably connected by the hinge 9, the first cover body 1 and the second cover body 2 inside both ends are provided with the absorption device 3, the absorption device 3 along the outside of the first cover body 1 and the second cover body 2 axial extension direction is provided with the end cap 6, the absorption device 3 along the inside of the first cover body 1 and the second cover body 2 axial extension direction is provided with the first fixed part 4, the first fixed part 4 along the inside of the first cover body 1 and the second cover body 2 axial extension direction is provided with several second fixed parts 5, the outer end of the first cover body 1 away from the hinge 9 direction is fixed with the lock catch 7, the outer end of the second cover body 2 away from the hinge 9 direction is fixed with the lock pin 8 that is engaged with the lock catch 7, the end cap 6, absorption device 3 and the first cover body 1, second cover body 2 between are all fixedly connected.

[0035] The end cap 6 is fixedly connected with the first cover body 1 and the second cover body 2, the hole in the middle of the end cap 6 can just fit the diameter of the object, which can effectively isolate the acidic gas in the external environment, improve the protection effect, the absorption device 3 is fixedly connected with the first cover body 1 and the second cover body 2, which can avoid loosening or falling off of the absorption device 3 due to vibration during the work of the object, and improve the fixing effect of the protection device; the first cover body 1 and the second cover body 2 are provided with several second fixed parts 5 inside, which can increase the specific number of second fixed parts 5 according to the actual need of the size of the protected object to further fix the inside of the cover, further improve the protection effect of the protection device, and avoid loosening or falling off; the snap connection mode of the lock pin 8 and the lock catch 7 is a common connection mode, which will not be described here. When pressed down, the lock catch 7 is locked in the lock pin 8, and when opened, the first cover body 1 and the second cover body 2 can be easily separated by force.

[0036] Among them, the first cover body 1, the second cover body 2 and the first fixed part 4 connection place are provided with through hole 10, the lower part of the through hole 10 is provided with the first circular groove 16 concentric with it, the diameter of the first circular groove 16 is greater than the diameter of the through hole 10, the bottom end of the first fixed part 4 extends to the first circular groove 16 through the through hole 10 and can move back and forth in the first circular groove 16 along the axial direction of the first circular groove 16, the bottom end of the first fixed part 4 and the bottom end of the first circular groove 16 are fixedly connected with the compression spring 14.

[0037] The diameter of the first circular groove 16 is greater than the diameter of the through hole 10, which can ensure that the bottom end of the first fixed part 4 always moves in the first circular groove 16. The compression spring 14 can prevent the first fixed part 4 from detaching from the cover, and on the other hand, the compression spring 14 can extrude the first fixed part 4 through its elastic force, thereby improving the close contact of the first fixed part 4 with the object and avoiding loosening of the protection device.

[0038] The first fixed part 4 comprises a first fixed shaft 401 and a first baffle plate 402 fixedly connected with the bottom end of the first fixed shaft 401, the top end of the first fixed shaft 401 is provided with a leather pad 13, the top end of the compression spring 14 is fixedly connected with the first baffle plate 402, and the first circular groove 16 is provided with a ladder 17 at the joint of the through hole 10, so that the movement direction of the first baffle plate 402 along the first fixed shaft 401 can be limited.

[0039] The ladder 17 and the first baffle plate 402 are arranged to limit the first fixed part 4, prevent the first fixed part 4 from being separated from the first cover body 1, the top end of the first fixed shaft 401 is provided with a leather pad 13, when the object is protected, the top end of the first fixed shaft 401 will first contact the object and extrude the object, the leather pad 13 can avoid damaging the object during extrusion, and the leather pad 13 can also increase the friction force of the contact with the object, so that the fixing effect can be significantly improved.

[0040] The first cover body 1, the second cover body 2 and the second fixed part 5 are provided with a second circular groove 11 at the connection position, the inner wall of the second circular groove 11 is fixedly provided with a clamping ring 12, the bottom end of the second fixed part 5 penetrates through the clamping ring 12 and can move back and forth in the second circular groove 11 along the axial direction of the second circular groove 11, the bottom end of the second fixed part 5 is provided with a second baffle plate 15, and the second baffle plate 15 is fixedly connected with the compression spring 14.

[0041] The clamping ring 12 is arranged to limit the second fixed part 5 and prevent the second fixed part 5 from falling off, the second baffle plate 15 is fixedly connected with the compression spring 14, the second baffle plate 15 has a certain thickness and can only move axially in the second circular groove 11, the second baffle plate 15 can limit the compression spring 14 on one side and avoid the compression spring 14 from being deviated on the other side when being extruded.

[0042] The second fixed part 5 comprises a second fixed shaft 501, the top end of the second fixed shaft 501 is provided with a leather pad 13, the bottom end of the second fixed shaft 501 is fixedly provided with two protrusions 502, the clamping ring 12 is provided with a groove 1201 corresponding to the protrusions 502, and the protrusions 502 of the second fixed part 5 can pass through the groove 1201 and enter the second circular groove 11.

[0043] In use, the two protrusions 502 on the second fixing part 5 are aligned with the grooves 1201 on the clamping ring 12 and pushed towards the compression spring 14, and when the protrusions 502 enter the grooves 1201, the second fixing shaft 501 is continued to be pushed, at this time, the bottom end of the second fixing shaft 501 is in contact with the second baffle 15 to form extrusion, until the protrusions 502 pass through the grooves 1201, the second fixing shaft 501 is rotated by 90°, at this time, the protrusions 502 on the second fixing part 5 are misaligned with the grooves 1201 and clamped on the bottom side of the clamping ring 12, and the second fixing part 5 is axially limited by the extrusion force of the compression spring 14, at this time, the installation of the second fixing part 5 is completed, when the second fixing part 5 is extruded by external objects, the second fixing shaft 501 continues to be pushed inwards to extrude the compression spring 14, forming an extrusion force, which is reacted to the objects, extruding the objects together with the second fixing shaft 501, the leather pad 13 at the top end of the second fixing shaft 501 can avoid damaging the objects during extrusion, and the leather pad 13 can also increase the friction force with the objects, which can significantly improve the fixing effect, when the second fixing part 5 is not needed, the second fixing shaft 501 is first pushed inwards, the second baffle 15 is pushed inwards by a distance, at this time, the second fixing shaft 501 is rotated, when the protrusions 502 on the second fixing shaft 501 are aligned with the grooves 1201 on the clamping ring 12, the second fixing part 5 can be pulled outwards, which is convenient and fast to install, improves the working efficiency, increases the fixing effect, and expands the use range of the protection device.

[0044] The first cover body 1 and the second cover body 2 are both half-circular structures with the same size, the first fixing part 4 and the second fixing part 5 are both vertically connected with the inner walls of the first cover body 1 and the second cover body 2, and the first fixing part 4 and the second fixing part 5 are both arranged in multiple rows inside the first cover body 1 and the second cover body 2.

[0045] The first cover body 1 and the second cover body 2 are both half-circular structures with the same size, which ensures the sealing performance when the protection device is folded, reduces the porosity, and effectively avoids the invasion of acidic gas, the first fixing part 4 and the second fixing part 5 are both vertically connected with the inner walls of the first cover body 1 and the second cover body 2, which ensures the stress concentration of the first fixing part 4 and the second fixing part 5 during use, significantly enhances the stability of the protection device during use, the first fixing part 4 and the second fixing part 5 are arranged in a whole row, which ensures the appearance of the protection device and further ensures the uniformity of the stress of the protection device, the first fixing part 4 is arranged at both ends, and a plurality of second fixing parts 5 are arranged at the middle position, which expands the use range of the protection device.

[0046] The absorption device 3 comprises a first absorption box 302 and a second absorption box 303, the first absorption box 302 and the second absorption box 303 are both circular arc structures concentric with the first cover body 1 and the second cover body 2, the bottom end of the second absorption box 303 is fixedly connected with the first cover body 1 and the second cover body 2, the bottom end of the first absorption box 302 is fixedly connected with the top end of the second absorption box 303, the arc-shaped cavities 304 are arranged in the first absorption box 302 and the second absorption box 303, the arc-shaped cavity 304 in the first absorption box 302 is filled with activated carbon, the arc-shaped cavity 304 in the second absorption box 303 is filled with alkali absorption cotton, a plurality of adsorption holes 305 are arranged on the outer side of the first absorption box 302 and the second absorption box 303, and a sealing cover 301 is arranged on the top of the arc-shaped cavities 304 of the first absorption box 302 and the second absorption box 303.

[0047] The first absorption box 302 and the second absorption box 303 adopt the circular arc structures concentric with the first cover body 1 and the second cover body 2, so that the fixing effect is better, the stability is higher, the loosening or falling of the absorption device 3 caused by vibration during the working process of the object can be avoided, the alkali absorption cotton in the absorption device 3 can absorb the acidic gas permeating into the inside of the protection device through the adsorption holes 305 and cause a neutralization reaction, the activated carbon in the absorption device 3 can also adsorb residual acidic gas, the alkali in the alkali absorption cotton can be sodium hydroxide solution, the alkali is injected in the middle of the adsorption cotton in advance, the injection of the alkali is stopped when the adsorption cotton is wetted by 90%, the overflow of the alkali due to too much alkali can be effectively prevented, the sealing cover 301 is sealingly arranged on the top of the arc-shaped cavities 304, the overflow of the activated carbon and the alkali absorption cotton can be avoided, and the best adsorption effect is ensured.

[0048] The outer surfaces of the first cover body 1 and the second cover body 2 are both sprayed with phenolic acid-resistant paint.

[0049] The phenolic acid-resistant paint is a kind of corrosion-resistant paint, which is sprayed on the outer surfaces of the first cover body 1 and the second cover body 2, so that the corrosion effect of the acidic gas on the protection device can be further avoided, and the service life of the protection device is significantly improved.

[0050] The working principle of the utility model is as follows:

[0051] In use, this invention covers the object to be protected by a first cover 1 and a second cover 2. The top ends of the first fixing shafts 401 on the first fixing parts 4 at both ends of the first cover 1 and the second cover 2 contact the surface of the object. When the first cover 1 and the second cover 2 are closed, the object exerts a squeezing force on the first fixing shafts 401. The squeezing force is transmitted to the compression spring 14 through the first fixing shafts 401. The compression spring 14 is compressed. When the latch 7 on the first cover 1 and the locking pin 8 on the second cover 2 are locked, the compression spring 14 squeezes the first fixing shaft 401, which in turn squeezes the surface of the object. Through the squeezing force... The protective device can be fixed to the protected object for a long time. When acidic gases from the outside invade the protective device over time, the acidic gases will be absorbed by the alkaline absorbent cotton in the absorbent device 3 through the adsorption holes 305, or by the activated carbon, effectively preventing the acidic gases from corroding and damaging the object. When the structure of the protected object is uneven, such as being narrow in the middle and wide at both sides, or when the diameter of the protected object is large and long, a certain number of second fixing parts 5 can be manually added. The second fixing parts 5 can make squeezing contact with the middle part of the protected object, further enhancing the fixing effect of the protective device and expanding the scope of application of the protective device.

[0052] Example 2:

[0053] like Figure 1 and Figure 10 As shown, this embodiment provides a technical solution based on embodiment one: the end cap 6 is provided with an arc-shaped transparent observation window 18.

[0054] An arc-shaped transparent observation window 18 is provided on the end cap 6. During use, the staff can periodically observe the adsorption status inside the absorption device 3 through the observation window 18. When a small amount of liquid is seen to overflow from the adsorption hole 305, or when a small amount of the adsorption hole 305 is blocked, the staff can promptly replace the alkaline absorbent cotton and activated carbon inside the absorption device 3 and clean the adsorption hole 305 in a timely manner to ensure a good adsorption effect of the absorption device 3.

[0055] In summary, this utility model has a simple structure, reasonable design, firm fixation, and good adsorption effect, which can effectively prevent acidic gases from corroding equipment components and significantly improve the service life of equipment components.

[0056] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application have been described in detail, for the skilled in the art, it still can be modified, or for the equivalent replacement of part of the technical features of the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included within the scope of the present application.

Claims

1. An acid gas protection device, comprising a first enclosure (1), characterized in that: The first cover (1) is rotatably connected to the second cover (2) via a hinge (9). Both ends of the first cover (1) and the second cover (2) are provided with absorption devices (3). The absorption devices (3) are provided with end caps (6) on the outer side of the axial extension direction of the first cover (1) and the second cover (2). The absorption devices (3) are provided with first fixing parts (4) on the inner side of the axial extension direction of the first cover (1) and the second cover (2). The first fixing parts (4) are provided with several second fixing parts (5) on the inner side of the axial extension direction of the first cover (1) and the second cover (2). The outer end of the first cover (1) away from the hinge (9) is fixed with a buckle (7). The outer end of the second cover (2) away from the hinge (9) is fixed with a locking pin (8) that engages with the buckle (7). The end caps (6), the absorption devices (3), the first cover (1), and the second cover (2) are all fixedly connected.

2. The acid gas protection device according to claim 1, characterized in that: A through hole (10) is provided at the connection between the first cover (1), the second cover (2) and the first fixing part (4). A first circular groove (16) concentric with the through hole (10) is provided at the lower part of the through hole (10). The diameter of the first circular groove (16) is larger than the diameter of the through hole (10). The bottom end of the first fixing part (4) extends through the through hole (10) to the first circular groove (16) and can move back and forth in the first circular groove (16) along the axial direction of the first circular groove (16). A compression spring (14) is fixedly connected between the bottom end of the first fixing part (4) and the bottom end of the first circular groove (16).

3. The acid gas protection device according to claim 2, characterized in that: The first fixing part (4) includes a first fixing shaft (401) and a first baffle (402) fixedly connected to the bottom end of the first fixing shaft (401). A leather pad (13) is provided at the top end of the first fixing shaft (401), and the top end of the compression spring (14) is fixedly connected to the first baffle (402).

4. The acid gas protection device according to claim 3, characterized in that: A ladder (17) is provided at the junction of the first circular groove (16) and the through hole (10), which can limit the movement of the first baffle (402) along the first fixed axis (401).

5. The acid gas protection device according to claim 4, characterized in that: A second circular groove (11) is provided at the connection between the first cover (1), the second cover (2) and the second fixing part (5). A snap ring (12) is fixed on the inner wall of the second circular groove (11). The bottom end of the second fixing part (5) passes through the snap ring (12) and can move back and forth in the second circular groove (11) along the axial direction of the second circular groove (11). A second baffle (15) is provided at the lower part of the bottom end of the second fixing part (5). A compression spring (14) is fixedly connected between the second baffle (15) and the bottom end of the second circular groove (11).

6. The acid gas protection device according to claim 5, characterized in that: The second fixing part (5) includes a second fixing shaft (501). A leather pad (13) is provided at the top of the second fixing shaft (501). Two protrusions (502) are fixedly provided at the bottom of the second fixing shaft (501). A groove (1201) corresponding to the protrusion (502) is provided on the snap ring (12). The protrusion (502) of the second fixing part (5) can just pass through the groove (1201) and enter the second circular groove (11).

7. The acid gas protection device according to claim 6, characterized in that: The first cover (1) and the second cover (2) are both semi-circular structures of the same size. The first fixing part (4) and the second fixing part (5) are both vertically connected to the inner walls of the first cover (1) and the second cover (2). The first fixing part (4) and the second fixing part (5) are arranged in multiple rows inside the first cover (1) and the second cover (2). The two ends of each row are set as the first fixing part (4), and several second fixing parts (5) are set in the middle position.

8. The acid gas protection device according to claim 1, characterized in that: The absorption device (3) includes a first absorption box (302) and a second absorption box (303). Both the first absorption box (302) and the second absorption box (303) are arc-shaped structures concentric with the first cover (1) and the second cover (2). The bottom end of the second absorption box (303) is fixedly connected to the first cover (1) and the second cover (2), and the bottom end of the first absorption box (302) is fixedly connected to the top end of the second absorption box (303). Each of the first and second absorption boxes (302 and 303) has an arc-shaped cavity (304) inside. The arc-shaped cavity (304) of the first absorption box (302) is filled with activated carbon, and the arc-shaped cavity (304) of the second absorption box (303) is filled with alkali absorbent cotton. The outer surfaces of the first absorption box (302) and the second absorption box (303) are provided with a plurality of adsorption holes (305). The top of the arc-shaped cavity (304) of the first absorption box (302) and the second absorption box (303) is provided with a sealing cap (301).

9. The acid gas protection device according to claim 1, characterized in that: The outer surfaces of the first cover (1) and the second cover (2) are both coated with phenolic acid-resistant paint.

10. An acid gas protection device according to claim 1, characterized in that: The end cap (6) is provided with an arc-shaped transparent observation window (18).

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