A sample lifting device for chemical wastewater detection

Abstract

The utility model relates to chemical sampling technical field proposes a kind of sampling device for chemical wastewater detection, including base, the top of base is fixedly connected with mounting bracket, rotatably connected with pivot between base and mounting bracket, the top of mounting bracket is provided with the drive mechanism for driving pivot intermittent rotation, one end of mounting bracket is fixedly connected with water injection pipe, the import end of water injection pipe is provided with pumping mechanism, the export end of water injection pipe is fixedly connected with butt joint pipe head, pivot is fixedly connected with rotating stand, the outer edge of rotating stand top is provided with several sample storage assemblies that are distributed at equal angles around rotating stand, one end of base is fixedly connected with arc protruding block, and several sample storage assemblies are alternatively contacted with arc protruding block by the rotation of cooperating rotating stand. The utility model solves the problem of discontinuous data by continuous sampling multiple times, improves the efficiency and accuracy of chemical wastewater detection.

Description

Technical Field

[0001] This utility model relates to the field of chemical sampling technology, specifically to a sampling device for chemical wastewater testing. Background Technology

[0002] Chemical wastewater testing is a critical step in chemical production, involving the regular sampling and analysis of wastewater components (such as pollutant concentration, pH value, heavy metal content, etc.) to ensure compliance with environmental standards and production safety. Traditional sampling devices are mainly used to extract samples from wastewater pools or pipelines, but due to limitations in structure and operation, they suffer from numerous efficiency and reliability issues.

[0003] A search revealed a Chinese patent (authorization announcement number: CN221898861U) that discloses "an automatic sampling device for chemical wastewater detection, comprising a mobile flatbed cart, a collection component, a load-bearing platform, a sampling component, a detection device, and a storage tank; the collection component is fixedly mounted on the end face of the mobile flatbed cart, the load-bearing platform is fixedly mounted on the end face of the mobile flatbed cart, the storage tank is fixedly mounted on the end face of the load-bearing platform, the detection device is connected to the front of the storage tank, the sampling component is connected to the side of the storage tank, and the sampling component is located above the collection component."

[0004] However, this type of solution has certain technical defects in the process of implementing the relevant technologies: First, existing sampling devices can only acquire one sample at a time, requiring operators to repeatedly start the equipment or change the sample storage container. This is not only time-consuming and labor-intensive, but may also lead to inconsistent sampling intervals, affecting the continuity and accuracy of the test data.

[0005] Second, existing devices cannot achieve automated intermittent sampling and rely on manual intervention to switch sample storage units or control water flow. For example, during the sampling process, operators need to manually adjust the position of the sample storage bottle or start the pumping equipment, which increases the risk of human error.

[0006] In view of this, the present invention proposes a sampling device for chemical wastewater testing. Utility Model Content

[0007] This invention proposes a sampling device for chemical wastewater testing, which solves the problem in the prior art that it is impossible to achieve continuous multiple sampling to improve the accuracy of test data.

[0008] The technical solution of this utility model is as follows: A sampling device for chemical wastewater testing includes a base, a mounting frame fixedly connected to the top of the base, a rotating shaft rotatably connected between the base and the mounting frame, a driving mechanism for intermittently rotating the rotating shaft provided at the top of the mounting frame, a water injection pipe fixedly connected to one end of the mounting frame, a pumping mechanism for intermittently introducing wastewater into the water injection pipe by cooperating with the activation of the driving mechanism at the inlet end of the water injection pipe, a connecting pipe head fixedly connected to the outlet end of the water injection pipe, a rotating frame fixedly connected to the rotating shaft, a plurality of sample storage components arranged at equal angles around the rotating frame along the outer edge of the top of the rotating frame, an arc-shaped protrusion fixedly connected to one end of the base, the plurality of sample storage components moving upward through contact with the arc-shaped protrusion and connecting to the connecting pipe head, and the plurality of sample storage components alternatingly contacting the arc-shaped protrusion by cooperating with the rotation of the rotating frame.

[0009] Preferably, the sample storage assembly includes a placement seat fixedly connected to the outer edge of the rotating frame, a water storage pipe is placed on the top of the placement seat, a retaining ring is fixedly connected to the top of the water storage pipe, an elastic tube is provided on the top of the water storage pipe, and a lifting member is provided on the outside of the water storage pipe, which drives the elastic tube to slide upward and engage with the connecting pipe head by contacting the arc-shaped protrusion.

[0010] Preferably, the lifting component includes a sliding rod that passes through the rotating frame, the sliding rod being slidably connected to the rotating frame, a retaining seat being fixedly connected to the top end of the sliding rod, the water storage pipe being inserted into the retaining seat, an arc-shaped top block being fixedly connected to the bottom end of the sliding rod, and a spring being sleeved on the sliding rod, with both ends of the spring abutting against the arc-shaped top block and the rotating frame, respectively.

[0011] Preferably, the elastic fitting includes a sleeve fixedly connected to the top of the water storage pipe, the sleeve being in communication with the inside of the water storage pipe, an insert being slidably connected to the top of the sleeve, a metal flexible tube being fixedly connected to the top of the insert, a retaining ring being fixedly connected to the top of the insert, and a spring piece being sleeved on the outside of the insert, with both ends of the spring piece abutting against the retaining ring and the sleeve, respectively.

[0012] Preferably, the inner wall of the connector is an arc-shaped structure, and the inner diameter of the connector is larger than the diameter of the metal hose.

[0013] Preferably, the driving mechanism includes a rotating seat fixedly connected to the top of the rotating shaft. The outer side of the rotating seat has several docking slots that correspond one-to-one with the water storage pipes. A motor is fixedly installed on the inner side of the mounting frame. A sector-shaped wheel is fixedly connected to the output shaft of the motor. A mounting plate is fixedly connected to the notch of the sector-shaped wheel. A driving block is fixedly connected to one end of the mounting plate. The driving block intermittently slides in cooperation with any one of the docking slots by cooperating with the rotation of the mounting plate.

[0014] Preferably, the pumping mechanism includes a cylinder fixedly connected to the top of the mounting frame. A push-pull rod is slidably connected to one end of the cylinder, penetrating the side wall of the cylinder. A piston is fixedly connected to one end of the push-pull rod, and the piston is slidably connected to the inner wall of the cylinder. A water inlet check valve is fixedly connected to the inlet end of the cylinder, and a pumping pipe is fixedly connected to the inlet end of the water inlet check valve. A water outlet check valve is fixedly connected to the outlet end of the cylinder, and the outlet end of the water outlet check valve is connected to the water injection pipe. The other end of the push-pull rod is provided with a linkage component that drives the push-pull rod to slide back and forth by cooperating with the start of a motor.

[0015] Preferably, the linkage includes an eccentric wheel fixedly connected to the motor output shaft, a connecting rod rotatably connected to the outer edge of the eccentric wheel, a connecting seat hinged to one end of the connecting rod, and a push-pull rod fixedly connected to one side of the connecting seat.

[0016] The working principle and beneficial effects of this utility model are as follows: 1. A drive mechanism intermittently rotates the shaft, causing multiple sample storage components on the rotating frame to move circumferentially. The sample storage components alternately abut against the arc-shaped protrusions on the base, automatically moving upwards and connecting to the connecting pipe. In conjunction with the pumping mechanism, wastewater is intermittently introduced into different sample storage components; this design allows for automatic completion of multiple sampling sets after a single setup, ensuring consistent sampling intervals and avoiding errors caused by manual intervention.

[0017] 2. The fully automated operation is achieved by linking the motor-driven drive mechanism and the pumping mechanism. The drive mechanism includes a fan-shaped rotating wheel and a drive block, which controls the intermittent rotation of the rotating seat. The pumping mechanism drives the push-pull rod to reciprocate through the eccentric wheel and connecting rod, and simultaneously completes the extraction and injection of wastewater. This design eliminates manual intervention, and the sampling process is completely mechanically controlled, ensuring the accuracy of each pumping and injection.

[0018] 3. Enhanced structural stability through integrated design, suitable for corrosive environments such as chemical wastewater ponds. The one-way valve of the pumping mechanism ensures unidirectional flow of wastewater and prevents backflow pollution; the fan-shaped rotor and docking groove of the drive mechanism provide precise intermittent control to avoid over-rotation or misalignment. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of a sampling device for chemical wastewater testing according to the present invention; Figure 2 This is a schematic diagram of the sample storage component of this utility model; Figure 3 This is a structural schematic diagram of the elastic tube fitting of this utility model; Figure 4This is a schematic diagram of the structure of the connector of this utility model; Figure 5 This is a schematic diagram of the drive mechanism of this utility model; Figure 6 This is a schematic diagram of the pumping mechanism of this utility model.

[0021] In the diagram: 1. Base; 2. Mounting bracket; 3. Rotating shaft; 4. Rotating frame; 6. Sample storage assembly; 61. Placement seat; 62. Water storage pipe; 63. Clamping ring; 64. Elastic fitting; 641. Sleeve; 642. Insertion tube; 643. Retaining ring; 644. Metal flexible hose; 645. Spring; 65. Slide rod; 66. Clamping seat; 67. Arc-shaped top block; 68. Spring; 7. Water injection pipe; 8. Connecting pipe end; 10. Arc 11. Shaped protrusion; 12. Drive mechanism; 13. Rotating seat; 14. Connecting groove; 15. Motor; 16. Sector-shaped wheel; 17. Mounting plate; 18. Drive block; 19. Pumping mechanism; 10. Cylinder; 112. Push-pull rod; 123. Piston; 124. Pumping pipe; 125. Inlet check valve; 126. Outlet check valve; 127. Eccentric wheel; 128. Connecting rod; 129. Connecting seat. Detailed Implementation

[0022] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0023] like Figures 1 to 6 As shown, this embodiment proposes a sampling device for chemical wastewater testing, including a base 1, a mounting frame 2 fixedly connected to the top of the base 1, a rotating shaft 3 rotatably connected between the base 1 and the mounting frame 2, a drive mechanism 11 for intermittently rotating the rotating shaft 3 provided at the top of the mounting frame 2, a water injection pipe 7 fixedly connected to one end of the mounting frame 2, a pumping mechanism 12 provided at the inlet end of the water injection pipe 7 for intermittently introducing wastewater into the water injection pipe 7 in conjunction with the start of the drive mechanism 11, a connecting pipe 8 fixedly connected to the outlet end of the water injection pipe 7, a rotating frame 4 fixedly connected to the rotating shaft 3, a plurality of sample storage components 6 arranged at equal angles around the rotating frame 4 along the outer edge of the top of the rotating frame 4, an arc-shaped protrusion 10 fixedly connected to one end of the base 1, the plurality of sample storage components 6 move upwards by contacting the arc-shaped protrusion 10 and connecting to the connecting pipe 8, and the plurality of sample storage components 6 alternately contact the arc-shaped protrusion 10 in conjunction with the rotation of the rotating frame 4.

[0024] By activating the drive mechanism 11, the rotating shaft 3 is driven to rotate intermittently, causing the rotating frame 4 to rotate. This allows all the sample storage components 6 to rotate intermittently in a circumferential direction. When the sample storage component 6 contacts the arc-shaped protrusion 10, the sample storage component 6 moves upward to connect with the connector 8. Then, the pumping mechanism 12 extracts a certain amount of wastewater and introduces it into the connector 8 through the water injection pipe 7. The wastewater is then introduced into the sample storage component 6 for storage through the connector 8. Similarly, when the next sample storage component 6 contacts the arc-shaped protrusion 10, it moves upward to connect with the connector 8. Then, the pumping mechanism 12 introduces a certain amount of wastewater into the sample storage component 6. This cycle continues, and the pumping mechanism 12 can introduce wastewater into each sample storage component 6 sequentially. This allows for continuous multi-group sampling, greatly improving sampling efficiency.

[0025] Furthermore, the sample storage assembly 6 includes a placement seat 61 fixedly connected to the outer edge of the rotating frame 4. A water storage pipe 62 is placed on the top of the placement seat 61. A retaining ring 63 is fixedly connected to the top of the water storage pipe 62. An elastic tube 64 is provided on the top of the water storage pipe 62. A lifting member is provided on the outside of the water storage pipe 62, which drives the elastic tube 64 upward to slide and cooperate with the connecting pipe head 8 by contacting the arc-shaped protrusion 10. The lifting member includes a slide rod 65 that passes through the rotating frame 4. The slide rod 65 is slidably connected to the rotating frame 4. A retaining seat 66 is fixedly connected to the top of the slide rod 65. The water storage pipe 62 is inserted into the retaining seat 66. An arc-shaped top block 67 is fixedly connected to the bottom of the slide rod 65. A spring 68 is sleeved on the slide rod 65. The two ends of the spring 68 contact the arc-shaped top block 67 and the rotating frame 4, respectively.

[0026] By activating the drive mechanism 11, the rotating shaft 3 is driven to rotate intermittently, causing the rotating frame 4 to rotate. This causes all the sliding rods 65 to drive the corresponding arc-shaped top blocks 67 to rotate intermittently in the circumferential direction. When the arc-shaped top block 67 abuts against the arc-shaped protrusion 10, the arc-shaped top block 67 is squeezed upward by the arc-shaped protrusion 10, causing the sliding rod 65 to slide upward. At this time, the spring 68 is compressed and stores potential energy, causing the card seat 66 to drive the water storage pipe 62 to move upward, causing the elastic pipe 64 to slide upward and engage with the connecting pipe 8. This allows the connecting pipe 8 to... The pumping mechanism 12 connects to the flexible pipe 64, then pumps out a certain amount of wastewater and introduces it into the connecting pipe 8 through the water injection pipe 7. The wastewater is then introduced into the storage pipe 62 through the flexible pipe 64 for storage. When the arc-shaped top block 67 disengages from the arc-shaped protrusion 10, the spring 68 releases potential energy, causing the sliding rod 65 to move downward. This causes the storage pipe 62 to drive the flexible pipe 64 to move downward and disengage from the connecting pipe 8. This cycle repeats, and the pumping mechanism 12 can introduce wastewater into each storage pipe 62 in turn, thereby achieving continuous multi-group sampling.

[0027] Furthermore, the flexible pipe fitting 64 includes a sleeve 641 fixedly connected to the top of the water storage pipe 62. The sleeve 641 is connected to the inside of the water storage pipe 62. The top end of the sleeve 641 is slidably connected to an insert 642. The top end of the insert 642 is fixedly connected to a metal flexible hose 644. The top end of the insert 642 is fixedly connected to a retaining ring 643. A spring piece 645 is sleeved on the outside of the insert 642. The two ends of the spring piece 645 abut against the retaining ring 643 and the sleeve 641, respectively. The inner wall of the pipe opening of the connecting pipe head 8 has an arc surface structure, and the inner diameter of the connecting pipe head 8 is larger than the diameter of the metal flexible hose 644.

[0028] As the water storage pipe 62 moves upward, the metal hose 644 connects with the connecting head 8 to form a pipe passage. At the same time, under the elastic action of the spring 645, the retaining ring 643 and the pipe opening of the connecting head 8 are in close contact to increase the sealing performance. The arc-shaped design of the inner wall of the pipe opening of the connecting head 8 can ensure that the metal hose 644 can smoothly disengage from the connecting head 8 when it rotates circumferentially with the water storage pipe 62.

[0029] Furthermore, the drive mechanism 11 includes a rotating seat 111 fixedly connected to the top of the rotating shaft 3. The outer side of the rotating seat 111 is provided with several docking slots 112 corresponding to the water storage pipes 62. A motor 113 is fixedly installed on the inner side of the mounting frame 2. A fan-shaped rotating wheel 114 is fixedly connected to the output shaft of the motor 113. A mounting plate 115 is fixedly connected to the notch of the fan-shaped rotating wheel 114. A drive block 116 is fixedly connected to one end of the mounting plate 115. The drive block 116 intermittently slides in cooperation with any docking slot 112 by cooperating with the rotation of the mounting plate 115.

[0030] The motor 113 drives the fan-shaped wheel 114 to rotate, which causes the mounting plate 115 to drive the drive block 116 to rotate circumferentially. When the drive block 116 slides with one of the docking slots 112, the rotating seat 111 rotates a certain angle under the drive of the drive block 116. When the drive block 116 disengages from the docking slot 112, the rotating seat 111 stops rotating. When the drive block 116 slides with the next docking slot 112, the rotating seat 111 rotates the same angle again. This cycle repeats, and the rotating seat 111 rotates intermittently.

[0031] Furthermore, the pumping mechanism 12 includes a cylinder 121 fixedly connected to the top of the mounting bracket 2. A push-pull rod 122, penetrating the side wall of the cylinder 121, is slidably connected to one end of the cylinder 121. A piston 123 is fixedly connected to one end of the push-pull rod 122, and the piston 123 is slidably connected to the inner wall of the cylinder 121. An inlet check valve 125 is fixedly connected to the inlet end of the cylinder 121, and a pumping pipe 124 is fixedly connected to the inlet end of the inlet check valve 125. An outlet check valve 126 is fixedly connected to the outlet end of the cylinder 121. The outlet end is connected to the water injection pipe 7. The other end of the push-pull rod 122 is provided with a linkage component that drives the push-pull rod 122 to slide back and forth by cooperating with the start of the motor 113. The linkage component includes an eccentric wheel 127 fixedly connected to the output shaft of the motor 113. The angle between the center line of the eccentric wheel 127 and the center line of the mounting plate 115 is the same as the angle between the two adjacent docking slots 112. The outer edge of the eccentric wheel 127 is rotatably connected to a connecting rod 128. One end of the connecting rod 128 is hinged to a connecting seat 129. One side of the connecting seat 129 is fixedly connected to the push-pull rod 122.

[0032] Working principle: First, the inlet end of the pumping pipe 124 is placed into the wastewater area to be sampled. Then, each water storage pipe 62 is installed on its corresponding mounting bracket 66. The starting motor 113 drives the fan-shaped rotating wheel 114 to rotate, causing the mounting plate 115 to drive the drive block 116 to rotate circumferentially. When the drive block 116 slides into one of the docking slots 112, the rotating seat 111 rotates a certain angle under the drive of the drive block 116. When the drive block 116 disengages from the docking slot 112, the rotating seat 111 stops rotating. When the drive block 116 slides into the next docking slot 112, the rotating seat 111... 11. Rotate the same angle again, and repeat this cycle. The rotating seat 111 rotates intermittently, causing the rotating shaft 3 to rotate intermittently, causing the rotating frame 4 to rotate, causing all the sliding rods 65 to drive the corresponding arc-shaped top blocks 67 to rotate intermittently in the circumferential direction. When the arc-shaped top block 67 abuts against the arc-shaped protrusion 10, the arc-shaped top block 67 is squeezed upward by the arc-shaped protrusion 10, causing the sliding rod 65 to slide upward. At this time, the spring 68 is compressed and stores potential energy, causing the card seat 66 to drive the water storage pipe 62 to move upward, causing the elastic pipe 64 to slide upward and cooperate with the connecting pipe 8, which makes the connecting pipe 8 and the elastic pipe 64 connected. When the motor 113 starts, the eccentric wheel 127 rotates synchronously, causing the connecting rod 128 to drive the connecting seat 129 and the push-pull rod 122 to slide back and forth, causing the piston 123 to slide back and forth inside the cylinder 121. When the eccentric wheel 127 rotates for half a cycle, the piston 123 slides away from the water pumping pipe 124, causing the pressure inside the cylinder 121 to decrease. This causes the water pumping pipe 124 to introduce wastewater. Since the angle between the center line of the eccentric wheel 127 and the center line of the mounting plate 115 is the same as the angle between the two adjacent docking slots 112, the drive block 116 is in a disengaged state from the docking slot 112, and the docking pipe head 8 and the elastic pipe 64 remain stationary. When the eccentric wheel 127 rotates in the second half cycle, the piston 123 slides close to the water pumping pipe 124, which increases the pressure inside the cylinder 121. This causes the wastewater inside the cylinder 121 to be introduced into the water injection pipe 7 through the outlet check valve 126, and then into the water storage pipe 62 through the elastic pipe 64 for storage. When the eccentric wheel 127 rotates for the next cycle, the sector wheel 114 rotates synchronously for the next cycle, causing the rotating seat 111 to rotate by an angle, which in turn causes the rotating frame 4 to rotate. When the next arc-shaped top block 67 abuts against the arc-shaped protrusion 10, the elastic pipe 64 of the next water storage pipe 62 is connected to the connecting pipe 8. Then, wastewater is introduced into the elastic pipe 64 through the water injection pipe 7 and the connecting pipe 8, so that the wastewater is introduced into the next water storage pipe 62 for sample storage. This cycle continues, and the water injection pipe 7 can intermittently introduce wastewater into different water storage pipes 62, which can realize continuous multi-group sampling and greatly improve sampling efficiency.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A sampling device for chemical wastewater testing, comprising a base (1), wherein a mounting frame (2) is fixedly connected to the top of the base (1), characterized in that, A rotating shaft (3) is rotatably connected between the base (1) and the mounting frame (2). A drive mechanism (11) for intermittently rotating the rotating shaft (3) is provided at the top of the mounting frame (2). A water injection pipe (7) is fixedly connected to one end of the mounting frame (2). A pumping mechanism (12) is provided at the inlet end of the water injection pipe (7) to intermittently introduce wastewater into the water injection pipe (7) in conjunction with the activation of the drive mechanism (11). A connecting pipe is fixedly connected to the outlet end of the water injection pipe (7). (8) A rotating frame (4) is fixedly connected to the rotating shaft (3). Several sample storage components (6) are arranged around the rotating frame (4) at equal angles along the outer edge of the top of the rotating frame (4). An arc-shaped protrusion (10) is fixedly connected to one end of the base (1). Several sample storage components (6) move upward and connect to the connecting pipe (8) by contacting the arc-shaped protrusion (10). Several sample storage components (6) contact the arc-shaped protrusion (10) alternately by cooperating with the rotation of the rotating frame (4).

2. The sampling device for chemical wastewater testing according to claim 1, characterized in that, The sample storage assembly (6) includes a placement seat (61) fixedly connected to the outer edge of the rotating frame (4). A water storage pipe (62) is placed on the top of the placement seat (61). A retaining ring (63) is fixedly connected to the top of the water storage pipe (62). An elastic tube (64) is provided on the top of the water storage pipe (62). A lifting member is provided on the outside of the water storage pipe (62) to drive the elastic tube (64) upward to slide and engage with the connecting pipe head (8) by abutting against the arc-shaped protrusion (10).

3. The sampling device for chemical wastewater testing according to claim 2, characterized in that, The lifting component includes a slide rod (65) that passes through the rotating frame (4). The slide rod (65) is slidably connected to the rotating frame (4). A retainer (66) is fixedly connected to the top of the slide rod (65). The water storage pipe (62) is inserted into the retainer (66). An arc-shaped top block (67) is fixedly connected to the bottom of the slide rod (65). A spring (68) is sleeved on the slide rod (65). The two ends of the spring (68) abut against the arc-shaped top block (67) and the rotating frame (4) respectively.

4. The sampling device for chemical wastewater testing according to claim 3, characterized in that, The elastic fitting (64) includes a sleeve (641) fixedly connected to the top of the water storage pipe (62). The sleeve (641) is connected to the inside of the water storage pipe (62). A tube (642) is slidably connected to the top of the sleeve (641). A metal flexible tube (644) is fixedly connected to the top of the tube (642). A retaining ring (643) is fixedly connected to the top of the tube (642). A spring piece (645) is sleeved on the outside of the tube (642). The two ends of the spring piece (645) abut against the retaining ring (643) and the sleeve (641) respectively.

5. The sampling device for chemical wastewater testing according to claim 4, characterized in that, The inner wall of the connector (8) is an arc-shaped structure, and the inner diameter of the connector (8) is larger than the diameter of the metal hose (644).

6. The sampling device for chemical wastewater testing according to claim 4, characterized in that, The drive mechanism (11) includes a rotating seat (111) fixedly connected to the top of the rotating shaft (3). The outer side of the rotating seat (111) is provided with several docking slots (112) corresponding to the water storage pipe (62). The inner side of the mounting frame (2) is fixedly installed with a motor (113). The output shaft of the motor (113) is fixedly connected with a fan-shaped wheel (114). The notch of the fan-shaped wheel (114) is fixedly connected with a mounting plate (115). One end of the mounting plate (115) is fixedly connected with a drive block (116). The drive block (116) intermittently slides with any docking slot (112) by cooperating with the rotation of the mounting plate (115).

7. A sampling device for chemical wastewater testing according to claim 6, characterized in that, The pumping mechanism (12) includes a cylinder (121) fixedly connected to the top of the mounting frame (2). One end of the cylinder (121) is slidably connected to a push-pull rod (122) that passes through the side wall of the cylinder (121). One end of the push-pull rod (122) is fixedly connected to a piston (123). The piston (123) is slidably connected to the inner wall of the cylinder (121). The inlet end of the cylinder (121) is fixedly connected to an inlet check valve (125). The inlet end of the inlet check valve (125) is fixedly connected to a pumping pipe (124). The outlet end of the cylinder (121) is fixedly connected to an outlet check valve (126). The outlet end of the outlet check valve (126) is connected to a water injection pipe (7). The other end of the push-pull rod (122) is provided with a linkage component that drives the push-pull rod (122) to slide back and forth by cooperating with the start of the motor (113).

8. The sampling device for chemical wastewater testing according to claim 7, characterized in that, The linkage includes an eccentric wheel (127) fixedly connected to the output shaft of the motor (113). A connecting rod (128) is rotatably connected to the outer edge of the eccentric wheel (127). A connecting seat (129) is hinged to one end of the connecting rod (128). One side of the connecting seat (129) is fixedly connected to the push-pull rod (122).

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