An apparatus for detecting aged rice

Abstract

The present invention relates to the technical field of aging degree detection devices, and specifically relates to a device for detecting aged rice, including a detection device, a centrifugation device and an observation device. The detection device and the observation device are both connected to the centrifugation device. The detection device includes an observation tube. It further includes: a titration mechanism connected to the observation tube. The titration mechanism includes a limit track, and arc-shaped fixing rings are fixedly installed at both ends of the limit track. The present invention drops potassium hydroxide solution into the observation tank through the titration mechanism. At the same time, when the experimenter observes the color change of the solution in the observation tank, the consumed volume of potassium hydroxide solution in the observation tube is observed, and this data is compared with the consumed volume of potassium hydroxide solution by aged rice at each stage, so as to judge the freshness of the aged rice, so as to solve the problems of the existing detection means and detection methods, which have high costs, inconvenient operations and are difficult to promote and apply.

Description

Technical Field

[0001] The present invention relates to the technical field of aging degree detection devices, and particularly to a device for detecting aged rice. Background Art

[0002] During the storage process of rice, it will deteriorate due to aging, especially in a humid and warm environment. When the deterioration is severe, its appearance will change, such as discoloration, etc., and thus it can be distinguished by the naked eye. However, for rice in the process of deterioration, since its appearance change is not obvious, it is difficult to directly distinguish. These rice grains are very likely to completely deteriorate under certain environmental conditions, or further mildew during transportation, which is not only extremely unfavorable to its own quality, but also affects other products in contact with it, posing a hazard to consumers. Therefore, a rice detection device is needed to detect rice.

[0003] Currently, to determine the freshness of new and old rice, it is mainly detected by professional technicians using professional instruments and equipment; the usage methods usually adopt quantitative methods such as optical, chemical, gas phase, chromatography and other instruments to analyze the contents of protein SH groups, S-S groups, fatty acids, volatile carbonyl compounds, volatile sulfides, etc. in rice, as well as methods such as analyzing the viscosity of rice, germination rate, and tasting of cooked rice. Using the above detection means and methods, the cost is relatively high, the operation is inconvenient, and it can only be used in scientific research institutions. Therefore, it is difficult to promote and apply; in daily life, ordinary people are difficult to accept.

[0004] Therefore, it is very necessary to invent a device for detecting aged rice. Summary of the Invention

[0005] For this purpose, the present invention provides a device for detecting aged rice. A potassium hydroxide solution is dropped into the observation tank through a titration mechanism. At the same time, when the experimenter observes the color change of the solution in the observation tank, the volume of the potassium hydroxide solution consumed in the observation tube is observed, and this data is compared with the volume of the potassium hydroxide solution consumed by aged rice at each stage, so as to judge the freshness of the aged rice, and solve the problems of the existing detection means and methods, which have high cost, inconvenient operation, and are difficult to promote and apply.

[0006] In order to achieve the above object, the present invention provides the following technical solution: A device for detecting aged rice, including a detection device, a centrifugation device and an observation device. The detection device and the observation device are both connected to the centrifugation device. The detection device includes an observation tube: It further includes: a titration mechanism connected to the observation tube.

[0007] The titration mechanism includes a limit track. Arc-shaped fixing rings are fixedly installed at both ends of the limit track. A bellows is fixedly installed at the bottom of the arc-shaped fixing ring at the top. A hard titration tube is fixedly installed at the bottom of the bellows. A flexible tube is fixedly installed at the bottom of the hard titration tube. A triangular head hard tube is fixedly installed at the bottom of the flexible tube. Thrust components are provided at both ends of the hard titration tube;

[0008] The thrust component includes a sliding seat. The bottom of the sliding seat is slidably connected to the top of the limit track. Slide columns are fixedly installed at both ends of the bottom of the sliding seat. Springs are sleeved on the outer surfaces of the two groups of slide columns. One end of each spring is fixedly connected to the side wall of the bottom of the sliding seat. Limit seats are slidably connected to the outer surfaces of the two groups of slide columns. The two groups of limit seats are respectively fixedly connected to both sides of the limit track. The other end of the spring is fixedly connected to the side wall of the limit seat. The hard titration tube fixedly penetrates through the two groups of sliding seats and is flush with the outer side walls of the two groups of sliding seats at both ends;

[0009] A temperature control component is provided in the middle of the two groups of thrust components. The temperature control component includes a double-ring base. The bottom of the double-ring base is slidably connected to the middle of the limit track. A limit mounting ring is provided in the middle of the double-ring base. The two ends of the limit mounting ring are respectively fixedly connected to both ends of the double-ring base. A heating tube is clamped on the inner side wall of the limit mounting ring. The hard titration tube located inside the limit mounting ring is fixedly connected to the side wall of the heating tube;

[0010] The titration mechanism further includes a rodless cylinder. The output end of the rodless cylinder is fixedly connected to the outer side wall of the double-ring base.

[0011] Preferably, the bottom of the observation tube is located inside the arc-shaped fixing ring and is fixedly connected to the top of the bellows. Potassium hydroxide solution is contained inside the observation tube. The outer side wall of the bottom of the observation tube is fixedly connected to the inner side wall of the arc-shaped fixing ring at the top.

[0012] Preferably, the centrifugal device includes an outer tank body. The limit track and the rodless cylinder are both fixedly connected to the bottom of the outer tank body. A servo motor is fixedly installed at the top of the outer tank body. An inner tank body is fixedly installed on the inner wall of the top of the outer tank body. A centrifugal tank is rotatably connected to the bottom of the inner tank body through a plain bearing. The inner tank body is communicated with the centrifugal tank. A feed pipe is fixedly installed on the side wall of the inner tank body. The bottom of the feed pipe is communicated with the inside of the inner tank body. The top of the feed pipe fixedly penetrates through the top wall of the outer tank body. A first feeding pipe is fixedly installed at the top of the feed pipe. The same triangular limiting rod is fixedly installed on the inner side wall of the centrifugal tank. The triangular limiting rod rotatably penetrates through the inner tank body and is fixedly connected to the output shaft of the servo motor at the top.

[0013] Preferably, the observation device includes an observation tank. A second feeding pipe is fixedly installed at the top of the observation tank, and the second feeding pipe is communicated with the inside of the observation tank. A stepped pipe is fixedly installed at the center of the top of the observation tank. The top of the stepped pipe is rotatably connected to the bottom of the centrifugal tank and is communicated with the inside of the centrifugal tank. A solenoid valve is fixedly installed at the connection between the stepped pipe and the centrifugal tank. A filter screen is fixedly installed on the inner side wall of the stepped pipe at the connection with the observation tank. The output end of the triangular head hard pipe fixedly penetrates through the side wall of the observation tank, and the outlet of the triangular head hard pipe is located inside the observation tank.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. Add aged rice powder and absolute ethanol into the inner tank body, place it in the centrifugal tank for centrifugal motion for 30 minutes, filter it into the observation tank after standing for 2 minutes. At the same time, add distilled water and phenolphthalein into the observation tank. Drop potassium hydroxide solution into the observation tank through the titration mechanism, and record the consumption of potassium hydroxide solution when the solution in the observation tank shows light red and does not fade for 30 seconds, and compare it with the volume of potassium hydroxide solution consumed by the aged rice at each stage, so as to judge the freshness of the aged rice. Since the fatty acid content of rice increases after storage for a period of time, and fatty acid can undergo saponification reaction with potassium hydroxide solution, the longer the storage time of rice, the more potassium hydroxide solution it consumes. Compared with the existing detection means and detection methods, this detection device has the advantages of low cost, simple operation and easy popularization and use;

[0016] 2. Use a rodless cylinder to drive the double-ring base to move up and down, so that the limit installation ring, heating pipe and titration hard pipe fixedly connected to the double-ring base move, so as to generate pressure between the potassium hydroxide solutions inside the titration hard pipe, make the pressure generated by the shaking of the potassium hydroxide solution greater than the tension between the potassium hydroxide solution and the wall of the triangular head hard pipe, and make the potassium hydroxide solution drip out of the triangular head hard pipe. Compared with the method of dripping liquid from a traditional burette, this titration method has the advantages of fully automatic operation, accurate measurement and the same volume of liquid dripped each time per unit time. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the device provided by the present invention;

[0018] Figure 2 It is a partial cross-sectional view of the observation device provided by the present invention;

[0019] Figure 3 It is a schematic internal structure diagram of the outer tank body provided by the present invention;

[0020] Figure 4 It is a schematic internal structure diagram of the centrifugal tank provided by the present invention;

[0021] Figure 5 Schematic structural diagram of the titration mechanism provided by the present invention;

[0022] Figure 6 Schematic installation structure diagram of each component on the limit track provided by the present invention;

[0023] Figure 7 Partial exploded view of the titration mechanism provided by the present invention;

[0024] Figure 8 Schematic structural diagram of the crosstalk component provided by the present invention;

[0025] Figure 9 Schematic structural diagram of the temperature control component provided by the present invention;

[0026] Figure 10 Exploded view of the temperature control component provided by the present invention.

[0027] In the figure: detection device 100, titration mechanism 110, limit track 111, arc fixing ring 112, bellows 113, titration hard tube 114, hose 115, triangular head hard tube 116, crosstalk component 120, sliding seat 121, sliding column 122, spring 123, limit seat 124, temperature control component 130, double-ring base 131, limit mounting ring 132, heating tube 133, rodless cylinder 140, observation tube 150, centrifugal device 200, outer tank 210, servo motor 211, inner tank 212, centrifugal tank 213, feed pipe 214, first feeding pipe 215, triangular limit rod 216, observation device 300, observation tank 310, second feeding pipe 320, stepped pipe 330, filter screen 340, solenoid valve 350. Detailed implementation manners

[0028] The following is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0029] Referring to the attached Figures 1-10 , a device for detecting aged rice provided by the present invention includes a detection device 100, a centrifugal device 200 and an observation device 300. The detection device 100 and the observation device 300 are both connected to the centrifugal device 200. The detection device 100 includes an observation tube 150: It further includes: a titration mechanism 110 connected to the observation tube 150;

[0030] The titration mechanism 110 includes a limit track 111. Arc-shaped fixing rings 112 are fixedly installed at both ends of the limit track 111. A bellows 113 is fixedly installed at the bottom of the arc-shaped fixing ring 112 at the top. A titration hard tube 114 is fixedly installed at the bottom of the bellows 113. A hose 115 is fixedly installed at the bottom of the titration hard tube 114. A triangular head hard tube 116 is fixedly installed at the bottom of the hose 115. The inner diameter of the triangular head of the triangular head hard tube 116 is smaller, and the potassium hydroxide solution cannot pass through the triangular head of the triangular head hard tube 116 without external force. Thrust components 120 are provided at both ends of the titration hard tube 114;

[0031] The thrust component 120 includes a sliding seat 121. The bottom of the sliding seat 121 is slidably connected to the top of the limit track 111. Slide columns 122 are fixedly installed at both ends of the bottom of the sliding seat 121. Springs 123 are sleeved on the outer surfaces of the two groups of slide columns 122. The springs 123 can play a buffering role. When the rodless cylinder 140 drives the double-ring base 131 to slide on the limit track 111, under the action of the titration hard tube 114, the two groups of sliding seats 121 can be driven to slide. At this time, the springs 123 will move reciprocally under force, so that the potassium hydroxide solution inside the titration hard tube 114 will shake. The force generated by the shaking is greater than the tension of the potassium hydroxide solution at the triangular head of the triangular head hard tube 116. At this time, the potassium hydroxide solution in the triangular head hard tube 116 can drip out smoothly. One end of the spring 123 is fixedly connected to the side wall of the bottom of the sliding seat 121. Limit seats 124 are slidably connected to the outer surfaces of the two groups of slide columns 122. The two groups of limit seats 124 are respectively fixedly connected to both sides of the limit track 111. The other end of the spring 123 is fixedly connected to the side wall of the limit seat 124. The titration hard tube 114 is fixedly penetrated through the two groups of sliding seats 121, and both ends are flush with the outer side walls of the two groups of sliding seats 121;

[0032] A temperature control component 130 is provided in the middle of the two groups of thrust components 120. The temperature control component 130 includes a double-ring base 131. When the rodless cylinder 140 drives the double-ring base 131 to slide on the limit track 111, the double-ring base 131 can drive the limit mounting ring 132 to slide, so as to drive the titration hard tube 114 located inside the limit mounting ring 132 to slide. The bottom of the double-ring base 131 is slidably connected to the middle of the limit track 111. A limit mounting ring 132 is provided in the middle of the double-ring base 131. Both ends of the limit mounting ring 132 are fixedly connected to both ends of the double-ring base 131. A heating tube 133 is clamped on the inner side wall of the limit mounting ring 132. The titration hard tube 114 located inside the limit mounting ring 132 is fixedly connected to the side wall of the heating tube 133. Specifically, the heating tube 133 can heat the potassium hydroxide solution to keep it in a liquid state all the time, preventing it from forming a colloidal state at low temperature and thus blocking the triangular head hard tube 116;

[0033] The titration mechanism 110 further includes a rodless cylinder 140. The output end of the rodless cylinder 140 is fixedly connected to the outer side wall of the double-ring base 131, and the rodless cylinder 140 can drive the double-ring base 131 to slide.

[0034] Furthermore, the bottom of the observation tube 150 is located inside the arc-shaped fixed ring 112 and is fixedly connected to the top end of the corrugated pipe 113. When the titration hard tube 114 slides, both the corrugated pipe 113 and the flexible tube 115 will deform, thereby providing a moving range for the titration hard tube 114. The observation tube 150 is filled with potassium hydroxide solution. After storing for a period of time, the fatty acid content of the rice increases. The fatty acid can undergo a saponification reaction with the potassium hydroxide solution, thereby consuming the potassium hydroxide solution. Therefore, more potassium hydroxide is required to turn the phenolphthalein solution red. The outer side wall of the bottom of the observation tube 150 is fixedly connected to the inner side wall of the arc-shaped fixed ring 112 located at the top. Specifically, by starting the rodless cylinder 140, the output end of the rodless cylinder 140 drives the double-ring base 131 to move up and down, so that the limit mounting ring 132, the heating tube 133 and the titration hard tube 114 fixedly connected to the double-ring base 131 move. At this time, the two sets of sliding seats 121 fixedly connected to the titration hard tube 114 move, so that the springs 123 at both ends of the titration hard tube 114 deform. Under the action of the elastic force of the springs 123, the two sets of sliding seats 121 can drive the titration hard tube 114 to reciprocate, causing the potassium hydroxide solution inside the titration hard tube 114 to shake. When the pressure generated by the shaking of the potassium hydroxide solution is greater than the tension between the potassium hydroxide solution at the triangular head of the triangular head hard tube 116 and the wall of the triangular head hard tube 116, the potassium hydroxide solution inside the triangular head hard tube 116 can be smoothly dripped out and reach the inside of the observation tank 310. The volume of the dripped solution is the reduction volume of the potassium hydroxide solution in the observation tube 150. The user can obtain the volume of the dripped potassium hydroxide solution by observing the change amount of the liquid level scale on the observation tube 150.

[0035] Further, the centrifugal device 200 includes an outer tank body 210. The limit track 111 and the rodless cylinder 140 are both fixedly connected to the bottom of the outer tank body 210. The outer tank body 210 provides support for the limit track 111 and the rodless cylinder 140. A servo motor 211 is fixedly installed at the top of the outer tank body 210. An inner tank body 212 is fixedly installed on the inner wall of the top of the outer tank body 210. The bottom of the inner tank body 212 is rotationally connected to a centrifugal tank 213 through a flat bearing. The inner tank body 212 is communicated with the centrifugal tank 213. A feed pipe 214 is fixedly installed on the side wall of the inner tank body 212. The bottom of the feed pipe 214 is communicated with the inside of the inner tank body 212. The top of the feed pipe 214 fixedly penetrates the top wall of the outer tank body 210. A first feeding pipe 215 is fixedly installed at the top of the feed pipe 214. The same triangular limit rod 216 is fixedly installed on the inner side wall of the centrifugal tank 213. The triangular limit rod 216 rotatably penetrates the inner tank body 212 and is fixedly connected to the output shaft of the servo motor 211 at the top. Specifically, the user adds the aged rice powder to be detected into the inner tank body 212 through the first feeding pipe 215, and at the same time adds absolute ethanol. Then, by starting the servo motor 211, the output shaft of the servo motor 211 drives the triangular limit rod 216 to rotate, forcing the centrifugal tank 213 fixedly connected to the triangular limit rod 216 to rotate, so that the aged rice powder and absolute ethanol located inside the centrifugal tank 213 perform centrifugal motion. After centrifuging for 30 minutes, it is left standing for 2 minutes.

[0036] Further, the observation device 300 includes an observation tank 310. A second feeding pipe 320 is fixedly installed at the top of the observation tank 310. The second feeding pipe 320 is communicated with the inside of the observation tank 310. A stepped pipe 330 is fixedly installed at the center of the top of the observation tank 310. The top of the stepped pipe 330 is rotationally connected to the bottom of the centrifugal tank 213 and is communicated with the inside of the centrifugal tank 213. A solenoid valve 350 is fixedly installed at the connection between the stepped pipe 330 and the centrifugal tank 213. A filter screen 340 is fixedly installed on the inner side wall of the stepped pipe 330 at the connection with the observation tank 310. The filter screen 340 can filter the aged rice powder and only allow the ethanol solution containing fatty acids to pass through. The output pipe of the triangular head hard pipe 116 fixedly penetrates the side wall of the observation tank 310, and the outlet of the triangular head hard pipe 116 is located inside the observation tank 310. Specifically, after the centrifugation and standing of the aged rice powder and absolute ethanol in the centrifugal tank 213 are completed, the solenoid valve 350 is opened. When the aged rice powder and absolute ethanol pass through the filter screen 340, the ethanol containing fatty acids passes through the filter screen 340 and enters the observation tank 310. After the filtration is completed, distilled water and phenolphthalein are added into the observation tank 310 through the second feeding pipe 320, and then the titration operation is performed through the titration mechanism 110.

[0037] The usage process of the present invention is as follows: Those skilled in the art add the aged rice powder to be detected into the inner tank 212 through the first feeding pipe 215, and at the same time add absolute ethanol. Then, by starting the servo motor 211, the output shaft of the servo motor 211 drives the triangular limiting rod 216 to rotate, forcing the centrifuge tank 213 fixedly connected to the triangular limiting rod 216 to rotate, so that the aged rice powder and absolute ethanol inside the centrifuge tank 213 perform centrifugal motion. After centrifuging for 30 minutes and standing still for 2 minutes, at this time, the absolute ethanol can extract the fatty acids inside the aged rice powder. The longer the storage time of the rice, the higher the fatty acid content. After the centrifuging and standing still are completed, the solenoid valve 350 is opened. When the aged rice powder and absolute ethanol pass through the filter screen 340, the ethanol containing fatty acids passes through the filter screen 340 and enters the observation tank 310. After the filtration is completed, distilled water and phenolphthalein are added to the observation tank 310 through the second feeding pipe 320. At the same time, by starting the rodless cylinder 140, the output end of the rodless cylinder 140 drives the double-ring base 131 to move up and down, so that the limiting mounting ring 132, the heating pipe 133 and the titration hard tube 114 fixedly connected to the double-ring base 131 move. At this time, the two sliding seats 121 fixedly connected to the titration hard tube 114 move, so that the springs 123 at both ends of the titration hard tube 114 are deformed. Under the action of the elastic force of the springs 123, the two sliding seats 121 can drive the titration hard tube 114 to perform reciprocating motion, so that the potassium hydroxide solution inside the titration hard tube 114 shakes. When the pressure generated by the shaking of the potassium hydroxide solution is greater than the tension between the potassium hydroxide solution at the triangular head of the triangular head hard tube 116 and the tube wall of the triangular head hard tube 116, the potassium hydroxide solution inside the triangular head hard tube 116 can be smoothly dripped out and reach the inside of the observation tank 310. The dripped volume is the reduction volume of the potassium hydroxide solution in the observation tube 150. The user can obtain the volume of the dripped potassium hydroxide solution by observing the change of the liquid level scale on the observation tube 150. When the phenolphthalein solution in the observation tank 310 shows a light red color and does not fade for 30 seconds, the rodless cylinder 140 is opened again to make the double-ring base 131 drive the titration hard tube 114 to stop moving. At this time, observe the consumption of the potassium hydroxide solution in the observation tube 150, and compare this data with the volume of the potassium hydroxide solution consumed by the aged rice at each stage, so as to judge the freshness of the aged rice.

[0038] The above are only the preferred embodiments of the present invention. Any person skilled in the art may modify the present invention by using the technical solutions described above or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement made according to the technical solutions of the present invention falls within the scope of the present invention's protection.

Claims

1. An apparatus for detecting aged rice, comprising a detection device (100), a centrifugation device (200) and an observation device (300), wherein the detection device (100) and the observation device (300) are both connected to the centrifugation device (200), and characterized in that: The detection device (100) includes an observation tube (150), and further includes: a titration mechanism (110) connected to the observation tube (150); The titration mechanism (110) includes a limit track (111), arc-shaped fixing rings (112) are fixedly installed at both ends of the limit track (111), a corrugated pipe (113) is fixedly installed at the bottom of the arc-shaped fixing ring (112) located at the top, a titration hard pipe (114) is fixedly installed at the bottom of the corrugated pipe (113), a hose (115) is fixedly installed at the bottom of the titration hard pipe (114), a triangular-head hard pipe (116) is fixedly installed at the bottom of the hose (115), and crosstalk components (120) are provided at both ends of the titration hard pipe (114); The crosstalk component (120) includes a sliding seat (121), the bottom of the sliding seat (121) is slidably connected to the top of the limit track (111), sliding columns (122) are fixedly installed at both ends of the bottom of the sliding seat (121), springs (123) are sleeved on the outer surfaces of the two groups of sliding columns (122), one end of each spring (123) is fixedly connected to the side wall of the bottom of the sliding seat (121), limit seats (124) are slidably connected to the outer surfaces of the two groups of sliding columns (122), the two groups of limit seats (124) are respectively fixedly connected to both sides of the limit track (111), the other end of each spring (123) is fixedly connected to the side wall of the limit seat (124), and the titration hard pipe (114) fixedly penetrates through the two groups of sliding seats (121), and both ends are flush with the outer side walls of the two groups of sliding seats (121); A temperature control component (130) is provided in the middle of the two groups of crosstalk components (120), the temperature control component (130) includes a double-ring base (131), the bottom of the double-ring base (131) is slidably connected to the middle of the limit track (111), a limit installation ring (132) is provided in the middle of the double-ring base (131), both ends of the limit installation ring (132) are fixedly connected to both ends of the double-ring base (131), a heating pipe (133) is clamped on the inner side wall of the limit installation ring (132), and the titration hard pipe (114) located inside the limit installation ring (132) is fixedly connected to the side wall of the heating pipe (133); The titration mechanism (110) further includes a rodless cylinder (140), and the output end of the rodless cylinder (140) is fixedly connected to the outer side wall of the double-ring base (131); The bottom of the observation tube (150) is located inside the arc-shaped fixing ring (112) and is fixedly connected to the top end of the corrugated pipe (113). The observation tube (150) is filled with potassium hydroxide solution, and the outer side wall of the bottom of the observation tube (150) is fixedly connected to the inner side wall of the arc-shaped fixing ring (112) located at the top.

2. The device for detecting aged rice according to claim 1, characterized in that: The centrifugal device (200) includes an outer tank body (210). The limiting track (111) and the rodless cylinder (140) are both fixedly connected to the bottom of the outer tank body (210). A servo motor (211) is fixedly installed at the top of the outer tank body (210). An inner tank body (212) is fixedly installed on the inner wall of the top of the outer tank body (210). The bottom of the inner tank body (212) is rotatably connected to a centrifugal tank (213) through a plain bearing. The inner tank body (212) is communicated with the centrifugal tank (213). A feed pipe (214) is fixedly installed on the side wall of the inner tank body (212). The bottom of the feed pipe (214) is communicated with the inside of the inner tank body (212). The top of the feed pipe (214) fixedly penetrates through the top wall of the outer tank body (210). A first feeding pipe (215) is fixedly installed at the top of the feed pipe (214). The same triangular limiting rod (216) is fixedly installed on the inner side wall of the centrifugal tank (213). The triangular limiting rod (216) rotatably penetrates through the inner tank body (212) and is fixedly connected to the output shaft of the servo motor (211) at the top.

3. The device for detecting aged rice according to claim 2, characterized in that: The observation device (300) includes an observation tank (310). A second feeding pipe (320) is fixedly installed at the top of the observation tank (310). The second feeding pipe (320) is communicated with the inside of the observation tank (310). A stepped pipe (330) is fixedly installed at the center of the top of the observation tank (310). The top of the stepped pipe (330) is rotatably connected to the bottom of the centrifugal tank (213) and is communicated with the inside of the centrifugal tank (213). A solenoid valve (350) is fixedly installed at the connection between the stepped pipe (330) and the centrifugal tank (213). A filter screen (340) is fixedly installed on the inner side wall of the stepped pipe (330) at the connection with the observation tank (310). The output end of the triangular head hard pipe (116) fixedly penetrates through the side wall of the observation tank (310), and the outlet of the triangular head hard pipe (116) is located inside the observation tank (310).

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