A safety sampling device for chemical wastewater detection

Abstract

The application belongs to the technical field of wastewater detection, and discloses a safe sampling device for chemical wastewater detection, which has the following technical points: a control box is fixedly installed on the side wall through a support, a sampling box is fixedly installed at the bottom end of the control box, a sampling cylinder is fixedly installed at the bottom end of the sampling box, a sampling disc is arranged in the inner cavity of the sampling box, a liquid storage cavity is formed in the annular side wall of the sampling disc, a control mechanism is arranged in the control box, the control mechanism comprises a liquid storage assembly and a liquid taking assembly, the liquid storage assembly comprises a rotating part and a limiting part, the liquid taking assembly comprises a suction part and a lifting part, the liquid storage assembly composed of the rotating part and the limiting part and the liquid taking assembly composed of the suction part and the lifting part are matched with each other, multiple suction sampling can be performed at different positions and different depths in the wastewater pool, multiple groups of wastewater samples can be classified and stored through multiple groups of liquid storage cavities on the surface of the sampling disc, and the sampling effect and the sampling efficiency are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater detection, and particularly relates to a safe sampling device for chemical wastewater detection. BACKGROUND

[0002] Chemical wastewater refers to wastewater such as chemical wastewater, cooling water, waste gas washing water, equipment and site flushing water and the like discharged in chemical production. If the wastewater is discharged without treatment, it will cause different properties and different degrees of pollution to water bodies, thereby endangering human health and affecting industrial and agricultural production.

[0003] A chemical plant usually sets up a wastewater pool to store chemical wastewater. Before treatment, the water quality of the chemical wastewater generally needs to be sampled and detected so as to be treated in a harmless manner.

[0004] At present, the wastewater in the wastewater pool is mainly sucked by a sampling cylinder to be detected. The existing sampling device can only sample once in use. After sampling, the sample liquid needs to be taken down before the next sampling, and the wastewater at different positions and different depths in the wastewater pool cannot be sampled at the same time. The worker needs to sample multiple times, and the use effect is poor. SUMMARY

[0005] The present application aims to provide a safe sampling device for chemical wastewater detection to solve the problems in the background art.

[0006] To achieve the above object, the present application provides the following technical scheme.

[0007] A safe sampling device for chemical wastewater testing includes a control box. A connector is located at the top of the control box. A sampling box is fixedly mounted on the side wall of the control box via a bracket. The sampling box has a disc-shaped structure. A bottom hole is located at the bottom of the sampling box, and a top hole is located at the top. A sealing plug is detachably installed in the top hole. A sampling cylinder is fixedly mounted at the bottom of the sampling box, with its top end communicating with the bottom hole. A sampling hole is formed on the side wall of the sampling cylinder. A motor is fixedly mounted inside the control box, and a sealing shell is located outside the motor. A transmission disc is fixedly mounted on the output shaft of the motor, and an arc-shaped rack is provided on the surface of the transmission disc. A sampling disc is located inside the sampling box, and multiple sets of equally spaced sampling plates are formed on the annular side wall of the sampling disc. The liquid storage chamber is provided with a control mechanism inside the control box. The control mechanism includes a liquid storage component and a liquid extraction component. The liquid storage component includes a rotating part and a limiting part. The rotating part is located inside the control box and connected to the sampling plate. The rotating part is used to control the sampling plate to rotate at a certain angle inside the sampling box. The limiting part is connected to the rotating part and positions the sampling plate by cooperating with the rotating part, thereby aligning the lowest liquid storage chamber with the bottom hole. The liquid extraction component includes a suction part and a lifting part. The suction part is located inside the sampling cylinder, and the lifting part is located on the side wall of the control box and connected to the suction part. The lifting part, in cooperation with the suction part, draws wastewater into the sampling cylinder and pushes the wastewater in the sampling cylinder into the liquid storage chamber.

[0008] As a further embodiment of the present invention: the rotating part includes a bearing column rotatably mounted inside the control box cavity, one end of the bearing column extends into the sampling box, the sampling disk is fixedly mounted on the surface of the bearing column, and a fixed toothed disc is fixedly mounted on the surface of the bearing column, the fixed toothed disc meshing with the rack.

[0009] As a further aspect of the present invention: the limiting part includes multiple sets of positioning plates that are arranged in a ring and are equally spaced and fixedly installed on the side wall of the fixed gear plate. The positioning plates are made of magnetic material. A connecting rod is fixedly installed on the top wall of the control box. A magnetic block that cooperates with the positioning plates is fixedly installed at the bottom end of the connecting rod.

[0010] As a further aspect of the present invention: the suction unit includes a piston that is slidably mounted in the vertical direction within the sampling cylinder cavity; a control bar is slidably mounted in the vertical direction on the outer side of the control box; a synchronizing rod is fixedly mounted at the bottom end of the piston; the synchronizing rod is a U-shaped mechanism; and the end of the synchronizing rod away from the piston extends to the outer side of the sampling cylinder and is connected to the control bar.

[0011] As a further embodiment of the present invention: the lifting part includes a rotating shaft rotatably mounted inside the control box cavity, one end of the rotating shaft extends to the outside of the control box and a disc is fixedly mounted thereon, a guide groove is opened on the surface of the control bar, a guide post is provided on the surface of the disc at a position off-center, the guide post is inserted into the guide groove, a control gear plate is fixedly mounted on the surface of the rotating shaft, and the control gear plate meshes with the rack.

[0012] As a further aspect of the present invention: the annular sidewall of the sampling plate is provided with a sealing gasket located outside the liquid storage chamber.

[0013] As a further embodiment of the present invention: the inner wall of the sampling cylinder is provided with a fixing groove located outside the sampling hole, a sealing plate that cooperates with the sampling hole is rotatably installed in the fixing groove, and a stop bar that cooperates with the sealing plate is fixedly installed in the fixing groove.

[0014] Compared with existing technologies, the beneficial effects of this invention are: by setting up a liquid storage assembly composed of a rotating part and a limiting part, and a liquid collection assembly composed of a suction part and a lifting part to cooperate with each other, multiple samplings can be performed at different positions and depths in the wastewater tank. Furthermore, multiple sets of liquid storage chambers on the surface of the sampling plate can be used to classify and preserve multiple wastewater samples, effectively improving sampling effect and efficiency. This solves the problem that current methods can only perform single sampling, requiring multiple sampling operations by staff, resulting in poor performance. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a safe sampling device for chemical wastewater testing provided in an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the internal structure of the control box in a safe sampling device for chemical wastewater testing provided in an embodiment of the present invention.

[0017] Figure 3 This is a front view schematic diagram of a safe sampling device for chemical wastewater testing provided in an embodiment of the present invention.

[0018] Figure 4 This is a left-side view of the control box and its connection structure in a safe sampling device for detecting chemical wastewater provided in an embodiment of the present invention.

[0019] Figure 5 for Figure 1 A magnified structural diagram of A in the diagram.

[0020] Figure 6 for Figure 3 A magnified structural diagram of B in the diagram.

[0021] Figure 7This is a schematic diagram of the sampling plate and its connection structure in a safe sampling device for chemical wastewater testing provided in an embodiment of the present invention.

[0022] The components are: 1-control box, 11-connector, 2-sampling box, 21-bottom hole, 22-sealing plug, 3-sampling cylinder, 31-sampling hole, 4-motor, 41-transmission disc, 42-rack, 5-sampling disc, 51-liquid storage chamber, 6-control mechanism, 61-liquid storage assembly, 611-rotating part, 6111-bearing column, 6112-fixed gear disc, 612-limiting part, 6121-positioning plate. 6122-Connecting rod, 6123-Magnetic block, 62-Liquid extraction assembly, 621-Suction section, 6211-Piston, 6212-Synchronizing rod, 6213-Control bar, 622-Lifting section, 6221-Rotating shaft, 6222-Control gear plate, 6223-Disc, 6224-Guide groove, 6225-Guide column, 7-Sealing gasket, 8-Fixing groove, 9-Sealing plate, 10-Stop bar. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0024] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0025] like Figure 1 , Figure 2 , Figure 4 , Figure 6The diagram shows a structural diagram of a safe sampling device for chemical wastewater testing according to an embodiment of the present invention. It includes a control box 1, with a connector 11 at the top. A sampling box 2 is fixedly mounted on the side wall of the control box 1 via a bracket. The sampling box 2 has a disc-shaped structure, a bottom hole 21 at the bottom, and a top hole at the top. A sealing plug 22 is detachably installed in the top hole. A sampling cylinder 3 is fixedly mounted at the bottom of the sampling box 2, with its top end communicating with the bottom hole 21. A sampling hole 31 is opened on the side wall of the sampling cylinder 31. A motor 4 is fixedly mounted inside the control box 1, with a sealing shell on the outside of the motor 4. A transmission disc 41 is fixedly mounted on the output shaft of the motor 4, and an arc-shaped rack 42 is provided on the surface of the transmission disc 41. A sampling disc 5 is provided inside the sampling box 2, and multiple sets of equally spaced liquid storage chambers 51 are opened on the annular side wall of the sampling disc 5. A control mechanism 6 is provided inside the control box 1. The control mechanism 6 includes a liquid storage component 61 and a liquid dispensing component 62. The liquid storage component 61 includes a rotating part 611 and a limiting part 612. The rotating part 611 is located inside the control box 1 and is connected to the sampling tray 5. The rotating part 611 is used to control the sampling tray 5 to rotate a certain angle within the sampling box 2. The limiting part 612 is connected to the rotating part 611 and cooperates with the rotating part 611. The sampling plate 5 is positioned in a manner that aligns the lowest liquid storage chamber 51 with the bottom hole 21. The liquid sampling assembly 62 includes a suction part 621 and a lifting part 622. The suction part 621 is located inside the sampling cylinder 3, and the lifting part 622 is located on the side wall of the control box 1 and connected to the suction part 621. The lifting part 622, in cooperation with the suction part 621, draws wastewater into the sampling cylinder 3 and pushes the wastewater in the sampling cylinder 3 into the liquid storage chamber 51.

[0026] In use, the operator connects the external positioning rod to the connector 11. The operator then moves the control box 1 and the sampling box 2 together into the wastewater tank by holding the positioning rod. When the sampling box 2 is moved to the appropriate sampling position, the motor 4 drives the transmission disc 41 to rotate, which in turn drives the rack 42 to rotate. When the rack 42 rotates, it cooperates with the rotating part 611 to drive the sampling disc 5 to rotate a certain angle in the inner cavity of the sampling box 2. After the sampling disc 5 rotates a certain angle, the limiting part 612 controls the sampling disc 5 to stop rotating in the sampling box 2, so that the liquid storage chamber 51 at the lowest point of the sampling disc 5 is aligned with the bottom hole 21. The rack 42 continues to rotate, and the lifting part 622 and the suction part 621 cooperate to draw the wastewater in the wastewater tank through the sampling hole 31 into the sampling cylinder 3. The lifting part 622 and the suction part 621 further apply a pushing force to the wastewater in the sampling cylinder 3, so that the wastewater in the sampling cylinder 3 flows through the bottom hole 21 into the liquid storage chamber 51.

[0027] The rack 42 rotates continuously. When the rack 42 rotates, it cooperates with the rotating part 611 to drive the sampling disc 5 to rotate again at a certain angle within the sampling box 2. This causes another set of unused storage chambers 51 to align with the bottom hole 21 again. The storage chambers 51, after collecting wastewater, rotate into the sampling box 2. The inner wall of the sampling box 2 seals the ports of the storage chambers 51, effectively preventing the sample wastewater from flowing out. The operator uses a positioning rod to adjust the position of the control box 1 and the sampling box 2 within the wastewater pool. After the sampling box 2 moves to another sampling position, the rack 42 continues to rotate. The lifting part 622 and the suction part 621 cooperate to draw the wastewater from the wastewater pool through the sampling hole 31 back into the sampling cylinder 3. The lifting part 622 and the suction part 621 further apply a pushing force to the wastewater in the sampling cylinder 3, causing the wastewater in the sampling cylinder 3 to flow again through the bottom hole 21 into this set of storage chambers 51. By repeating the above operation, multiple samples can be taken at different locations and depths within the wastewater tank. The multiple liquid storage chambers 51 on the surface of the sampling tray 5 can store and process multiple sets of wastewater samples respectively. After the equipment is removed from the wastewater tank, the sampling box 2 is inverted, the sealing plug 22 is opened, and the sampling tray 5 rotates at equal intervals within the sampling box 2. The sample wastewater in the liquid storage chambers 51 can then automatically flow out from the top hole, thus enabling safe testing of the wastewater.

[0028] like Figure 2 , Figure 4 , Figure 7 As shown, in a preferred embodiment of the present invention, the rotating part 611 includes a support column 6111 rotatably mounted inside the control box 1. One end of the support column 6111 extends into the sampling box 2. The sampling disk 5 is fixedly mounted on the surface of the support column 6111. A fixed toothed disk 6112 is fixedly mounted on the surface of the support column 6111. The fixed toothed disk 6112 meshes with the rack 42.

[0029] In use, the motor 4 drives the transmission disk 41 to rotate, which in turn drives the rack 42 to rotate synchronously. When the rack 42 contacts the fixed gear disk 6112, the rack 42 meshes with the fixed gear disk 6112, which can drive the fixed gear disk 6112 to rotate. The fixed gear disk 6112 drives the bearing column 6111 to rotate, which in turn drives the sampling disk 5 to rotate synchronously in the sampling box 2. When the rack 42 separates from the fixed gear disk 6112, the rack 42 releases the driving force on the fixed gear disk 6112. The limiting part 612 controls the fixed gear disk 6112 to stop rotating in time in the control box 1. The fixed gear disk 6112 and the bearing column 6111 cooperate with each other to control the sampling disk 5 to stop rotating synchronously in the sampling box 2. At this time, the liquid storage cavity 51 at the lowest point of the sampling disk 5 surface is aligned with the bottom hole 21.

[0030] like Figure 2 , Figure 4 ,Figure 7 As shown, in a preferred embodiment of the present invention, the limiting part 612 includes a plurality of positioning plates 6121 arranged in a ring with equal spacing and fixedly installed on the side wall of the fixed toothed disc 6112. The positioning plates 6121 are made of magnetic material. A connecting rod 6122 is fixedly installed on the top wall of the control box 1. A magnetic block 6123 that cooperates with the positioning plates 6121 is fixedly installed at the bottom end of the connecting rod 6122.

[0031] Initially, a set of positioning plates 6121 on the surface of the fixed gear disk 6112 are in contact with the magnetic block 6123. The magnetic block 6123 is connected to the positioning plates 6121 by magnetic attraction, forming a whole. At this time, the fixed gear disk 6112 remains stationary in the control box 1. When the rack 42 contacts the fixed gear disk 6112, the rack 42 meshes with the fixed gear disk 6112, causing the fixed gear disk 6112 to rotate and thus causing the positioning plates 6121 and the magnetic block 6123 to separate. When the rack 42 separates from the fixed gear disk 6112, the driving force on the fixed gear disk 6112 is released, and another set of positioning plates 6121 on the surface of the fixed gear disk 6112 contacts the magnetic block 6123. The magnetic block 6123 is connected to this set of positioning plates 6121 by magnetic attraction, forming a whole. At this time, the fixed gear disk 6112 again remains stationary in the control box 1.

[0032] like Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, in a preferred embodiment of the present invention, the suction part 621 includes a piston 6211 that is slidably mounted vertically in the inner cavity of the sampling cylinder 3, a control bar 6213 that is slidably mounted vertically on the outer side of the control box 1, and a synchronizing rod 6212 that is fixedly mounted at the bottom end of the piston 6211. The synchronizing rod 6212 is a U-shaped mechanism, and the end of the synchronizing rod 6212 away from the piston 6211 extends to the outer side of the sampling cylinder 3 and is connected to the control bar 6213.

[0033] Initially, piston 6211 is located at the top of sampling cylinder 3. At this time, the side wall of piston 6211 seals the sampling hole 31 to prevent wastewater in the wastewater pool from flowing into the sampling cylinder 3 through the sampling hole 31 when the sampling cylinder 3 has not been moved to the appropriate sampling position. The rack 42 rotates continuously. When the rack 42 separates from the fixed gear plate 6112, the lifting part 622 drives the control bar 6213 to move back and forth vertically on the outside of the control box 1. When the control bar 6213 moves downward, it cooperates with the synchronizing rod 6212 to drive the piston 6211 to move downward synchronously in the sampling cylinder 3. At this time, the piston 6211 generates suction force to draw the wastewater in the wastewater pool into the sampling cylinder 3 through the sampling hole 31. When the control bar 6213 moves upward, it cooperates with the synchronizing rod 6212 to drive the piston 6211 to move upward synchronously in the sampling cylinder 3. The piston 6211 generates thrust on the wastewater and pushes the wastewater into the liquid storage chamber 51 through the bottom hole 21.

[0034] like Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, in a preferred embodiment of the present invention, the lifting part 622 includes a rotating shaft 6221 rotatably mounted inside the control box 1. One end of the rotating shaft 6221 extends to the outside of the control box 1 and is fixedly mounted on a disc 6223. A guide groove 6224 is provided on the surface of the control bar 6213. A guide post 6225 is provided on the surface of the disc 6223 at a position off-center. The guide post 6225 is inserted into the guide groove 6224. A control gear 6222 is fixedly mounted on the surface of the rotating shaft 6221. The control gear 6222 meshes with the rack 42.

[0035] The rack 42 rotates continuously. When the rack 42 separates from the fixed gear disk 6112, the rack 42 comes into contact with the control gear disk 6222. The rack 42 meshes with the control gear disk 6222, which in turn drives the control gear disk 6222 to rotate 360 ​​degrees. The control gear disk 6222 drives the rotating shaft 6221 to rotate 360 ​​degrees, which in turn drives the disc 6223 to rotate 360 ​​degrees synchronously outside the control box 1. The disc 6223 drives the guide column 6225 to rotate synchronously. The guide column 6225 and the guide groove 6224 cooperate with each other, which can drive the control bar 6213 to move back and forth in the vertical direction outside the control box 1.

[0036] like Figure 1 , Figure 3 , Figure 7 As shown, in a preferred embodiment of the present invention, the annular sidewall of the sampling plate 5 is provided with a sealing gasket 7 located outside the liquid storage chamber 51. The sealing gasket 7 can further improve the sealing effect at the port of the liquid storage chamber 51, effectively preventing the wastewater sample in the liquid storage chamber 51 from flowing out from the gap between the sampling plate 5 and the sampling box 2.

[0037] like Figure 3 , Figure 6 As shown, in a preferred embodiment of the present invention, the inner wall of the sampling cylinder 3 is provided with a fixing groove 8 located outside the sampling hole 31. A sealing plate 9 that cooperates with the sampling hole 31 is rotatably installed in the fixing groove 8, and a stop bar 10 that cooperates with the sealing plate 9 is fixedly installed in the fixing groove 8.

[0038] The sealing plate 9 and the baffle 10 cooperate with each other to control the unidirectional flow of wastewater in the sampling hole 31. When the piston 6211 moves downward, the wastewater in the wastewater pool flows through the sampling hole 31 into the sampling cylinder 3. When the piston 6211 moves upward, the sealing plate 9 and the sampling hole 31 fit together, which can effectively prevent the wastewater in the sampling cylinder 3 from flowing out of the sampling hole 31, so that the wastewater can flow fully into the liquid storage chamber 51.

[0039] The working principle of this invention is as follows: When in use, the operator connects the external positioning rod to the connector 11, and then moves the control box 1 and the sampling box 2 as a whole into the wastewater pool by holding the positioning rod. Initially, the piston 6211 is at the top of the sampling cylinder 3. At this time, the side wall of the piston 6211 seals the sampling hole 31 to prevent wastewater in the wastewater pool from flowing into the sampling cylinder 3 through the sampling hole 31 when the sampling cylinder 3 is not moved to the appropriate sampling position.

[0040] When the sampling box 2 moves to the appropriate sampling position, the motor 4 drives the transmission disk 41 to rotate, which in turn drives the rack 42 to rotate. When the rack 42 contacts the fixed gear disk 6112, the rack 42 meshes with the fixed gear disk 6112, which can drive the fixed gear disk 6112 to rotate. The fixed gear disk 6112 drives the bearing column 6111 to rotate, which in turn drives the sampling disk 5 to rotate synchronously in the sampling box 2. When the rack 42 separates from the fixed gear disk 6112, the rack 42 releases the driving force on the fixed gear disk 6112. The positioning piece 6121 on the surface of the fixed gear disk 6112 contacts the magnetic block 6123. The magnetic block 6123 is connected to this set of positioning pieces 6121 as a whole by magnetic attraction. At this time, the fixed gear disk 6112 remains stationary in the control box 1. At this time, the liquid storage cavity 51 at the lowest point of the sampling disk 5 surface is aligned with the bottom hole 21.

[0041] The rack 42 rotates continuously. When the rack 42 separates from the fixed gear disk 6112, the rack 42 comes into contact with the control gear disk 6222. The rack 42 meshes with the control gear disk 6222, which in turn drives the control gear disk 6222 to rotate 360 ​​degrees. The control gear disk 6222 drives the rotating shaft 6221 to rotate 360 ​​degrees, which in turn drives the disc 6223 to rotate 360 ​​degrees synchronously outside the control box 1. The disc 6223 drives the guide column 6225 to rotate synchronously. The guide column 6225 and the guide groove 6224 cooperate with each other, which can drive the control bar 6213 to move back and forth in the vertical direction outside the control box 1. When the control bar 6213 moves downward, it cooperates with the synchronizing rod 6212 to drive the piston 6211 to move downward synchronously in the sampling cylinder 3. At this time, the piston 6211 generates suction force to draw the wastewater in the wastewater tank into the sampling cylinder 3 through the sampling hole 31. When the control bar 6213 moves upward, it cooperates with the synchronizing rod 6212 to drive the piston 6211 to move upward synchronously in the sampling cylinder 3. The piston 6211 generates thrust on the wastewater and pushes the wastewater into the liquid storage chamber 51 through the bottom hole 21.

[0042] The rack 42 continues to rotate, causing the sampling disc 5 to rotate again at a certain angle within the sampling box 2. This allows another set of unused storage chambers 51 to align with the bottom hole 21 again. The storage chambers 51, after collecting wastewater, rotate into the sampling box 2. The inner wall of the sampling box 2 seals the ports of the storage chambers 51, effectively preventing the sample wastewater from flowing out. The operator uses a positioning rod to adjust the positions of the control box 1 and the sampling box 2 within the wastewater pool. After the sampling box 2 moves to another sampling position, the rack 42 continues to rotate, drawing the wastewater from the wastewater pool through the sampling hole 31 back into the sampling cylinder 3. This further applies a pushing force to the wastewater in the sampling cylinder 3, causing it to flow again through the bottom hole 21 into this set of storage chambers 51. By repeating the above operation, multiple samples can be taken at different locations and depths within the wastewater tank. The multiple liquid storage chambers 51 on the surface of the sampling tray 5 can store and process multiple sets of wastewater samples respectively. After the equipment is removed from the wastewater tank, the sampling box 2 is inverted, the sealing plug 22 is opened, and the sampling tray 5 rotates at equal intervals within the sampling box 2. The sample wastewater in the liquid storage chambers 51 can then automatically flow out from the top hole, thus enabling safe testing of the wastewater.

[0043] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A safe sampling device for chemical wastewater testing, comprising a control box, a connector at the top of the control box, a sampling box fixedly mounted on the side wall of the control box via a bracket, the sampling box having a disc-shaped structure, a bottom hole at the bottom of the sampling box, a top hole at the top of the sampling box, a sealing plug removably installed in the top hole, a sampling cylinder fixedly mounted at the bottom of the sampling box, the top of the sampling cylinder communicating with the bottom hole, and a sampling hole formed on the side wall of the sampling cylinder, characterized in that… A motor is fixedly installed inside the control box, and a sealing shell is provided on the outside of the motor. A transmission disk is fixedly installed on the output shaft of the motor, and an arc-shaped rack is provided on the surface of the transmission disk. A sampling disk is provided inside the sampling box, and multiple sets of equally spaced liquid storage chambers are opened on the annular sidewall of the sampling disk. The control box is equipped with a control mechanism, which includes a liquid storage component and a liquid dispensing component; The liquid storage assembly includes a rotating part and a limiting part. The rotating part is located inside the control box and connected to the sampling plate. The rotating part is used to control the sampling plate to rotate a certain angle inside the sampling box. The rotating part includes a support column rotatably installed inside the control box cavity. One end of the support column extends into the sampling box. The sampling plate is fixedly installed on the surface of the support column. A fixed toothed disc is fixedly installed on the surface of the support column. The fixed toothed disc meshes with a rack. The limiting part is connected to the rotating part. The limiting part positions the sampling plate by cooperating with the rotating part, thereby aligning the lowest liquid storage chamber with the bottom hole. The limiting part includes multiple sets of positioning plates that are evenly distributed in a ring and are fixedly installed on the side wall of the fixed toothed disc. The positioning plates are made of magnetic material. A connecting rod is fixedly installed on the top wall of the control box. A magnetic block that cooperates with the positioning plates is fixedly installed at the bottom end of the connecting rod. The liquid sampling assembly includes a suction section and a lifting section. The suction section is located inside the sampling cylinder, and the lifting section is located on the side wall of the control box and connected to the suction section. The lifting section, in cooperation with the suction section, draws wastewater into the sampling cylinder and pushes the wastewater in the sampling cylinder into the storage chamber. The suction section includes a piston that is slidably mounted vertically inside the sampling cylinder. A control bar is slidably mounted vertically on the outside of the control box. A synchronizing rod is fixedly mounted at the bottom of the piston. The synchronizing rod is a U-shaped mechanism. The end of the synchronizing rod away from the piston extends to the outside of the sampling cylinder and is connected to the control bar. The lifting section includes a rotating shaft that is rotatably mounted inside the control box. One end of the rotating shaft extends to the outside of the control box and is fixedly mounted on a disc. A guide groove is formed on the surface of the control bar. A guide post is set on the surface of the disc off-center and inserted into the guide groove. A control gear plate is fixedly mounted on the surface of the rotating shaft. The control gear plate meshes with the rack.

2. The safe sampling device for chemical wastewater testing according to claim 1, characterized in that, The sampling plate has a sealing gasket located outside the liquid storage chamber on its annular sidewall.

3. The safe sampling device for chemical wastewater testing according to claim 1, characterized in that, The inner wall of the sampling cylinder is provided with a fixing groove located outside the sampling hole. A sealing plate that cooperates with the sampling hole is rotatably installed in the fixing groove, and a stop bar that cooperates with the sealing plate is fixedly installed in the fixing groove.

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