Radioactive waste liquid decay tank with buffer structure

Abstract

The utility model discloses a radioactive waste liquid decay pool with a buffer structure, which belongs to the technical field of decay pools and comprises an equipment main body, and a connecting mechanism and a buffer damping mechanism are mounted on the equipment main body. The connecting mechanism comprises a first connecting mechanism and a second connecting assembly, the first connecting mechanism is connected with the second connecting assembly, and the first connecting mechanism and the second connecting assembly are both connected with the equipment body. Through the mode, the equipment main body is connected together through the first connecting mechanism and the second connecting assembly, the buffering and damping mechanism buffers the bottom of the equipment main body, and when medical wastewater to be treated is injected into the equipment main body, the medical wastewater to be treated is injected into the equipment main body due to the buffering effect of the first connecting mechanism, the second connecting assembly and the buffering and damping mechanism; the equipment main body cannot be impacted by wastewater, the decay tanks are connected, the stability of the decay tanks is enhanced, and the equipment main body plays a role in buffering and damping when water enters the decay tanks.

Description

Technical Field

[0001] The utility model relates to the technical field of decay pools, in particular to a radioactive waste liquid decay pool with a buffer structure. Background Art

[0002] At present, when traditional nuclear medicine decay pools are treating wastewater decay, when medical wastewater is injected into the decay pool, a large amount of medical wastewater impacts the nuclear medicine decay pool. If this continues for a long time, it will cause certain damage to the decay pool.

[0003] For example, Chinese patent CN218729923U discloses a nuclear medicine decay pool structure, including a primary decay box, a motor is fixedly connected to the top outer wall of the primary decay box, a cleaning and stirring device is arranged inside the primary decay box, an inlet pipe is arranged on the top of the primary decay box, a liquid outlet is opened on the side wall of the primary decay box, a slag discharge port is arranged at the bottom of the primary decay box, and the liquid outlet is connected to a secondary decay box through a circulation pipe.

[0004] However, the technology has the following problems: it cannot buffer the impact force when medical wastewater is injected into the decay pool, and cannot ensure the stability of the decay pool during operation.

[0005] Based on this, the utility model designs a radioactive waste liquid decay pool with a buffer structure to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a radioactive waste liquid decay pool with a buffer structure.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A radioactive waste liquid decay pool with a buffer structure comprises an equipment body, on which a connecting mechanism and a buffer shock absorbing mechanism are installed;

[0009] The device body comprises a first connecting mechanism and a second connecting assembly, wherein the first connecting mechanism is connected to the second connecting assembly, and both the first connecting mechanism and the second connecting assembly are connected to the device body.

[0010] Furthermore, the connecting mechanism includes a first decay pool, a second decay pool, a third decay pool, a fourth decay pool, an inlet pipe and a drain pipe. The first decay pool, the second decay pool, the third decay pool and the fourth decay pool are all connected by a first connecting mechanism and a second connecting assembly. Four inlet pipes are provided and are respectively fixedly connected and communicated with the tops of the first decay pool, the second decay pool, the third decay pool and the fourth decay pool. Four drain pipes are provided and are respectively fixedly connected and communicated with the lower end side walls of the first decay pool, the second decay pool, the third decay pool and the fourth decay pool.

[0011] Furthermore, the first decay pool, the second decay pool, the third decay pool, and the fourth decay pool all include a shielding layer and a radioactive waste storage pool, the inner walls of the first decay pool, the second decay pool, the third decay pool, and the fourth decay pool are fixedly connected to the shielding layer, water is passed between the radioactive waste storage pool and the shielding layer, the radioactive waste storage pool is fixedly installed on the inner top of the first decay pool, the second decay pool, the third decay pool, and the fourth decay pool, and the radioactive waste storage pool is connected to the water inlet pipe and the drainage pipe.

[0012] Furthermore, the first decay pool, the second decay pool, the third decay pool, and the fourth decay pool are all connected to the buffer shock absorbing mechanism.

[0013] Furthermore, the first connecting mechanism includes a first suction cup, a fixing rod, a fixing ring, a mounting sleeve, a first spring and a positioning ball. The first suction cup is provided with four and the suction ends are detachably connected to the middle side walls of the first decay pool, the second decay pool, the third decay pool and the fourth decay pool, respectively. The four first suction cups are fixedly connected to the four fixing rods, respectively. The fixing ring is fixedly installed on the side walls of the fixing rod. The mounting sleeve is slidably connected to the fixing ring and the fixing rod. One end of the first spring is fixedly connected to the fixing ring, and the other end of the first spring is fixedly connected to the mounting sleeve. A first annular groove is provided on the mounting sleeve. The fixing rod is also provided with multiple groups of notches at equal intervals at a position matching with the first annular groove. The positioning ball is mounted in the multiple groups of notches and slides in contact with the first annular groove. The positioning ball is contacted and connected with the notch.

[0014] Furthermore, the inner wall of the fixing rod is connected to the second connecting component, and the positioning ball is connected to the second connecting component.

[0015] Furthermore, the second connecting component includes a second suction cup and a connecting rod, the second suction cup is provided with four and the suction ends are detachably connected to the middle side walls of the first decay pool, the second decay pool, the third decay pool and the fourth decay pool respectively, the second suction cup is arranged opposite to the first suction cup, the connecting rod is fixedly connected to the second suction cup, the inner wall of the fixed rod is slidably connected to the outer wall of the connecting rod, the connecting rod is provided with second annular grooves at equal intervals at a position matching the notch, and the positioning ball is clamped in the second annular groove.

[0016] Furthermore, the buffer shock absorbing mechanism includes a spring shock absorber, a bottom suction cup, a second spring, a connecting rod and a support block; the spring shock absorbers are provided with four and are respectively fixedly installed on the bottom of the first decay pool, the second decay pool, the third decay pool and the fourth decay pool; the connecting rods are provided with three at equal intervals and are arranged in a circle at the lower end of the support block; the lower end of the support block is hinged to one end of the connecting rod; the second springs are provided with three, and one end of the three second springs is respectively fixedly connected to the other end of the three connecting rods; the bottom suction cups are provided with three, and one end of the three bottom suction cups is respectively fixedly connected to the other end of the three second springs; the suction ends of the three bottom suction cups are respectively detachably connected to the bottom of the first decay pool, the second decay pool and the fourth decay pool.

[0017] Furthermore, the bottom suction cup, the second spring, the connecting rod and the support block are each provided with two groups, the one group of bottom suction cup, the second spring, the connecting rod and the support block are located at the lower ends of the first decay pool, the second decay pool and the fourth decay pool, the other group of bottom suction cup, the second spring, the connecting rod and the support block are located at the lower ends of the second decay pool, the third decay pool and the fourth decay pool, the suction ends of the one group of bottom suction cups are respectively detachably connected to the bottoms of the first decay pool, the second decay pool and the fourth decay pool, and the suction ends of the other group of bottom suction cups are respectively detachably connected to the bottoms of the second decay pool, the third decay pool and the fourth decay pool.

[0018] The utility model has the following technical effects:

[0019] When the utility model is in use, the device body is connected together by the first connecting mechanism and the second connecting assembly, and the buffering and shock-absorbing mechanism buffers the bottom of the device body. When medical wastewater to be treated is injected into the device body, due to the buffering effect of the first connecting mechanism, the second connecting assembly and the buffering and shock-absorbing mechanism, the device body will not be impacted by the wastewater, and the connection effect on the decay pool is realized, the stability of the decay pool is enhanced, and the buffering and shock-absorbing effect is played at the same time when multiple decay pools are filled with water. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 The utility model is a three-dimensional radioactive waste liquid decay pool with a buffer structure Figure 1 ;

[0022] Figure 2It is a front view of a radioactive waste liquid decay pool with a buffer structure according to the utility model;

[0023] Figure 3 The utility model is a three-dimensional radioactive waste liquid decay pool with a buffer structure Figure 2 ;

[0024] Figure 4 The utility model is a three-dimensional radioactive waste liquid decay pool with a buffer structure Figure 3 ;

[0025] Figure 5 For along Figure 2 AA direction cross-sectional view;

[0026] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0027] The numbers in the figure represent:

[0028] 1. Equipment body; 11. First decay pool; 12. Second decay pool; 13. Third decay pool; 14. Fourth decay pool; 15. Water inlet pipe; 16. Drain pipe; 17. Shielding layer; 18. Radioactive waste storage pool; 2. Connecting mechanism; 21. First connecting mechanism; 211. First suction cup; 212. Fixing rod; 213. Fixing ring; 214. Mounting sleeve; 215. First spring; 216. Positioning ball; 217. First ring groove; 218. Notch; 22. Second connecting assembly; 221. Second suction cup; 222. Connecting rod; 223. Second ring groove; 3. Buffering and shock absorbing mechanism; 31. Spring shock absorber; 32. Bottom suction cup; 33. Second spring; 34. Connecting rod; 35. Support block. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] The utility model is further described below in conjunction with embodiments.

[0031] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0032] Example 1

[0033] Please refer to the instruction manual Figure 1-6 , a radioactive waste liquid decay pool with a buffer structure, comprising a device body 1, on which a connecting mechanism 2 and a buffer shock absorbing mechanism 3 are installed;

[0034] The connecting mechanism 2 includes a first connecting mechanism 21 and a second connecting assembly 22 . The first connecting mechanism 21 is connected to the second connecting assembly 22 . Both the first connecting mechanism 21 and the second connecting assembly 22 are connected to the device body 1 .

[0035] When the utility model is in use, the equipment body 1 is connected together by the first connecting mechanism 21 and the second connecting assembly 22, and the buffering and shock-absorbing mechanism 3 buffers the bottom of the equipment body 1. When medical wastewater to be treated is injected into the equipment body 1, due to the buffering effect of the first connecting mechanism 21, the second connecting assembly 22 and the buffering and shock-absorbing mechanism 3, the equipment body 1 will not be impacted by the wastewater.

[0036] Example 2

[0037] like Figure 1-6 As shown, as a preferred embodiment of the utility model, the equipment body 1 includes a first decay pool 11, a second decay pool 12, a third decay pool 13, a fourth decay pool 14, an inlet pipe 15 and a drain pipe 16. The first decay pool 11, the second decay pool 12, the third decay pool 13, and the fourth decay pool 14 are all connected by a first connecting mechanism 21 and a second connecting assembly 22. The inlet pipe 15 is provided with four and is respectively fixedly connected and communicated with the top of the first decay pool 11, the second decay pool 12, the third decay pool 13, and the fourth decay pool 14. The drain pipe 16 is provided with four and is respectively fixedly connected and communicated with the lower end side walls of the first decay pool 11, the second decay pool 12, the third decay pool 13, and the fourth decay pool 14.

[0038] The first decay pool 11, the second decay pool 12, the third decay pool 13, and the fourth decay pool 14 all include a shielding layer 17 and a radioactive waste storage pool 18. The inner walls of the first decay pool 11, the second decay pool 12, the third decay pool 13, and the fourth decay pool 14 are fixedly connected to the shielding layer 17. Water is communicated between the radioactive waste storage pool 18 and the shielding layer 17. The radioactive waste storage pool 18 is fixedly installed on the inner top of the first decay pool 11, the second decay pool 12, the third decay pool 13, and the fourth decay pool 14, and the radioactive waste storage pool 18 is communicated with the water inlet pipe 15 and the drain pipe 16. The radioactive waste storage pool 18 is used to store radioactive waste, and the water is used to isolate and control the release of radioactive particles. The shielding layer 17 plays a role in shielding radioactive radiation, which can effectively isolate and control the radiation of radioactive waste and ensure the safety of the surrounding environment.

[0039] The first decay pool 11 , the second decay pool 12 , the third decay pool 13 , and the fourth decay pool 14 are all connected to the buffering and shock absorbing mechanism 3 .

[0040] The first connecting mechanism 21 includes a first suction cup 211, a fixing rod 212, a fixing ring 213, a mounting sleeve 214, a first spring 215 and a positioning ball 216. The first suction cup 211 is provided with four and the suction ends are detachably connected to the middle side walls of the first decay pool 11, the second decay pool 12, the third decay pool 13 and the fourth decay pool 14, respectively. The four first suction cups 211 are fixedly connected to the four fixing rods 212, respectively, the fixing ring 213 is fixedly installed on the side wall of the fixing rod 212, and the mounting sleeve 214 is provided with a first spring 215 and a positioning ball 216. 4 is slidably connected to the fixing ring 213 and the fixing rod 212, one end of the first spring 215 is fixedly connected to the fixing ring 213, and the other end of the first spring 215 is fixedly connected to the mounting sleeve 214, the mounting sleeve 214 is provided with a first annular groove 217, the fixing rod 212 is provided with a plurality of groups of notches 218 at equal intervals at the position matching with the first annular groove 217, the positioning ball 216 is matched and installed in the plurality of groups of notches 218 and slides in contact with the first annular groove 217, and the positioning ball 216 is in contact with the notch 218.

[0041] The inner wall of the fixing rod 212 is connected to the second connecting component 22 , and the positioning ball 216 is connected to the second connecting component 22 .

[0042] The second connecting component 22 includes a second suction cup 221 and a connecting rod 222. The second suction cup 221 is provided with four and the suction ends are detachably connected to the middle side walls of the first decay pool 11, the second decay pool 12, the third decay pool 13, and the fourth decay pool 14, respectively. The second suction cup 221 is arranged opposite to the first suction cup 211. The connecting rod 222 is fixedly connected to the second suction cup 221. The inner wall of the fixed rod 212 is slidably connected to the outer wall of the connecting rod 222. The connecting rod 222 is provided with second annular grooves 223 at equal intervals at a position matching the notch 218, and the positioning ball 216 is clamped in the second annular groove 223.

[0043] When the utility model is used, the four first suction cups 211 are respectively adsorbed on the side walls of the first decay pool 11, the second decay pool 12, the third decay pool 13 and the fourth decay pool 14, and then the four second suction cups 221 are respectively adsorbed on the side walls of the first decay pool 11, the second decay pool 12, the third decay pool 13 and the fourth decay pool 14, the four first suction cups 211 are opposite to the four second suction cups 221, the installation sleeve 214 is slid to one side, the installation sleeve 214 squeezes the first spring 215, so that the notch 218 and the first annular groove 217 are located on the same center line, the connecting rod 222 is pushed, so that the connecting rod 222 slides in the fixing rod 212, and the connecting rod 222 squeezes the positioning ball 216, so that the positioning ball 216 moves upward. Move to the first annular groove 217, continue to push the connecting rod 222, so that the second annular groove 223 moves to the same center line as the notch 218, then stop moving, the positioning ball 216 falls into the second annular groove 223, the positioning ball 216 is engaged with the second annular groove 223, and the mounting sleeve 214 is released at this time. Under the action of the first spring 215, the mounting sleeve 214 is reset, and the mounting sleeve 214 locks the positioning ball 216 in the second annular groove 223, thereby connecting the fixing rod 212 and the connecting rod 222 together, and the first decay pool 11, the second decay pool 12, the third decay pool 13, and the fourth decay pool 14 are thus connected together, realizing the connection of the decay pools, and at the same time playing a buffering and shock-absorbing role when water enters multiple decay pools.

[0044] Example 3

[0045] like Figure 1-6 As shown, as a preferred embodiment of the utility model, the buffer shock absorbing mechanism 3 includes a spring shock absorber 31, a bottom suction cup 32, a second spring 33, a connecting rod 34 and a support block 35; the spring shock absorber 31 is provided with four and is respectively fixedly installed on the bottom of the first decay pool 11, the second decay pool 12, the third decay pool 13, and the fourth decay pool 14, the connecting rod 34 is provided with three at equal intervals and is arranged in a circle at the lower end of the support block 35, the lower end of the support block 35 is hinged to one end of the connecting rod 34, the second spring 33 is provided with three, and one end of the three second springs 33 is respectively fixedly connected to the other end of the three connecting rods 34, the bottom suction cup 32 is provided with three, and one end of the three bottom suction cups 32 is respectively fixedly connected to the other end of the three second springs 33, and the suction ends of the three bottom suction cups 32 are detachably connected to the bottom of the first decay pool 11, the second decay pool 12, and the fourth decay pool 14.

[0046] The bottom suction cup 32, the second spring 33, the connecting rod 34 and the supporting block 35 are each provided with two groups, the one group of bottom suction cup 32, the second spring 33, the connecting rod 34 and the supporting block 35 are located at the lower ends of the first decay pool 11, the second decay pool 12 and the fourth decay pool 14, and the other group of bottom suction cup 32, the second spring 33, the connecting rod 34 and the supporting block 35 are located at the lower ends of the second decay pool 12, the third decay pool 13 and the fourth decay pool 14, the suction ends of the one group of bottom suction cups 32 are detachably connected to the bottoms of the first decay pool 11, the second decay pool 12 and the fourth decay pool 14, respectively, and the suction ends of the other group of bottom suction cups 32 are detachably connected to the bottoms of the second decay pool 12, the third decay pool 13 and the fourth decay pool 14, respectively.

[0047] When the utility model is in use, the medical waste water is injected into the first decay pool 11, the second decay pool 12, the third decay pool 13, and the fourth decay pool 14. The impact force of the medical waste water on the decay pool is buffered by the spring shock absorber 31, thereby reducing the damage of the medical waste water to the decay pool. In addition, multiple decay pools are connected together through the bottom suction cup 32, thereby enhancing the stability of the decay pool. The second spring 33 connected to the bottom suction cup 32 also plays a buffering and shock-absorbing role on the decay pool.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A radioactive waste liquid decay pool with a buffer structure, comprising a device body (1), characterized in that: The device body (1) is provided with a connecting mechanism (2) and a buffering and shock absorbing mechanism (3); The connecting mechanism (2) comprises a first connecting mechanism (21) and a second connecting component (22); the first connecting mechanism (21) is connected to the second connecting component (22); and both the first connecting mechanism (21) and the second connecting component (22) are connected to the device body (1).

2. The radioactive waste liquid decay pool with a buffer structure according to claim 1, characterized in that: The equipment body (1) comprises a first decay pool (11), a second decay pool (12), a third decay pool (13), a fourth decay pool (14), a water inlet pipe (15) and a drain pipe (16); the first decay pool (11), the second decay pool (12), the third decay pool (13) and the fourth decay pool (14) are connected via a first connection mechanism (21) and a second connection assembly (22); four water inlet pipes (15) are provided and are respectively fixedly connected to and communicated with the tops of the first decay pool (11), the second decay pool (12), the third decay pool (13) and the fourth decay pool (14); four drain pipes (16) are provided and are respectively fixedly connected to and communicated with the lower end side walls of the first decay pool (11), the second decay pool (12), the third decay pool (13) and the fourth decay pool (14).

3. The radioactive waste liquid decay pool with a buffer structure according to claim 2, characterized in that: The first decay pool (11), the second decay pool (12), the third decay pool (13), and the fourth decay pool (14) all comprise a shielding layer (17) and a radioactive waste storage pool (18); the inner walls of the first decay pool (11), the second decay pool (12), the third decay pool (13), and the fourth decay pool (14) are all fixedly connected to the shielding layer (17); water is communicated between the radioactive waste storage pool (18) and the shielding layer (17); the radioactive waste storage pool (18) is fixedly installed on the inner top of the first decay pool (11), the second decay pool (12), the third decay pool (13), and the fourth decay pool (14); and the radioactive waste storage pool (18) is communicated with a water inlet pipe (15) and a drain pipe (16).

4. The radioactive waste liquid decay pool with a buffer structure according to claim 3, characterized in that: The first decay pool (11), the second decay pool (12), the third decay pool (13), and the fourth decay pool (14) are all connected to the buffer shock absorbing mechanism (3).

5. The radioactive waste liquid decay pool with a buffer structure according to claim 4, characterized in that: The first connection mechanism (21) comprises a first suction cup (211), a fixing rod (212), a fixing ring (213), a mounting sleeve (214), a first spring (215) and a positioning ball (216); the first suction cup (211) is provided with four suction ends which are detachably connected to the middle side walls of the first decay pool (11), the second decay pool (12), the third decay pool (13) and the fourth decay pool (14); the four first suction cups (211) are respectively fixedly connected to the four fixing rods (212); the fixing ring (213) is fixedly mounted on the side walls of the fixing rods (212); the mounting sleeve (214) is provided with a first spring (215) and a positioning ball (216); 4) is slidably connected to the fixing ring (213) and the fixing rod (212), one end of the first spring (215) is fixedly connected to the fixing ring (213), and the other end of the first spring (215) is fixedly connected to the mounting sleeve (214), the mounting sleeve (214) is provided with a first annular groove (217), the fixing rod (212) is also provided with a plurality of groups of notches (218) at equal intervals at a position matching with the first annular groove (217), the positioning ball (216) is matched and installed in the plurality of groups of notches (218) and slides in contact with the first annular groove (217), and the positioning ball (216) is contacted and connected with the notch (218).

6. The radioactive waste liquid decay pool with a buffer structure according to claim 5, characterized in that: The inner wall of the fixing rod (212) is connected to the second connecting component (22), and the positioning ball (216) is connected to the second connecting component (22).

7. The radioactive waste liquid decay pool with a buffer structure according to claim 6, characterized in that: The second connection component (22) comprises a second suction cup (221) and a connecting rod (222); the second suction cup (221) is provided with four suction ends which are detachably connected to the middle side walls of the first decay pool (11), the second decay pool (12), the third decay pool (13) and the fourth decay pool (14); the second suction cup (221) is arranged opposite to the first suction cup (211); the connecting rod (222) is fixedly connected to the second suction cup (221); the inner wall of the fixing rod (212) is slidably connected to the outer wall of the connecting rod (222); the connecting rod (222) is provided with second annular grooves (223) at equal intervals at positions matching the notches (218); the positioning balls (216) are snap-fitted to the second annular grooves (223).

8. The radioactive waste liquid decay pool with a buffer structure according to claim 7, characterized in that: The buffer shock absorbing mechanism (3) comprises a spring shock absorber (31), a bottom suction cup (32), a second spring (33), a connecting rod (34) and a support block (35); the spring shock absorbers (31) are provided with four and are respectively fixedly installed at the bottom of the first decay pool (11), the second decay pool (12), the third decay pool (13) and the fourth decay pool (14); the connecting rods (34) are provided with three at equal intervals and are arranged in a circle at the lower end of the support block (35); the lower end of the support block (35) The bottom suction cups (32) are hinged to one end of the connecting rod (34), three second springs (33) are provided, and one end of the three second springs (33) are respectively fixedly connected to the other end of the three connecting rods (34), three bottom suction cups (32) are provided, and one end of the three bottom suction cups (32) are respectively fixedly connected to the other end of the three second springs (33), and the suction ends of the three bottom suction cups (32) are respectively detachably connected to the bottom of the first decay pool (11), the second decay pool (12), and the fourth decay pool (14).

9. The radioactive waste liquid decay pool with a buffer structure according to claim 8, characterized in that: The bottom suction cup (32), the second spring (33), the connecting rod (34) and the supporting block (35) are each provided with two groups. The bottom suction cup (32), the second spring (33), the connecting rod (34) and the supporting block (35) of the first group are located at the lower ends of the first decay pool (11), the second decay pool (12) and the fourth decay pool (14). The bottom suction cup (32), the second spring (33), the connecting rod (34) and the supporting block (35) of the second group are located at the lower ends of the second decay pool (12), the third decay pool (13) and the fourth decay pool (14). The suction ends of the bottom suction cup (32) of the first group are detachably connected to the bottoms of the first decay pool (11), the second decay pool (12) and the fourth decay pool (14), respectively. The suction ends of the bottom suction cup (32) of the other group are detachably connected to the bottoms of the second decay pool (12), the third decay pool (13) and the fourth decay pool (14), respectively.

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