A type II automated liquid sampling device

Abstract

The present invention belongs to the technical field of sampling equipment, and specifically relates to a type II automated liquid sampling equipment, including a bracket and a measuring cylinder assembly arranged on the bracket, a sampling assembly, a water inlet-stirring-drainage assembly and a control assembly. After the sample liquid is placed in the equipment, the equipment performs water injection and stirring, then performs sampling, and finally performs cleaning of the inner wall of the cylinder and the pipeline. When the equipment provided by the present invention performs sampling, the sampling quality and stability can be improved, while reducing the number of operators and improving efficiency and accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of sampling equipment, and in particular relates to a type II automatic liquid sampling equipment. Background Art

[0002] At present, the detection of various material components and mechanical compositions involves dissolution, sampling and other operations, such as the determination of soil mechanical composition. Small batch sampling is generally done manually, but for large batch sampling, if it is still done manually, there are problems such as inaccurate sampling position and different sampling amounts. In addition, during the mixing process, the uniformity is poor, and a large amount of manpower is required, and the whole process is inefficient and has poor accuracy. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a type II automated liquid sampling device.

[0004] The present invention is implemented in this way, providing a type II automatic liquid sampling device, including a bracket and a measuring cylinder assembly arranged on the bracket, a sampling assembly and a control assembly, the measuring cylinder assembly includes a plurality of measuring cylinder units arranged closely in the transverse direction, and each measuring cylinder unit includes a plurality of measuring cylinders; the sampling assembly includes a transverse moving unit, a sampling unit arranged on the transverse moving unit and a sample box assembly arranged on the bracket, the sampling unit includes a sampling control frame, a pipette lifting control unit, a pipette and a liquid discharge unit, the sampling control frame is arranged on the transverse moving unit on one side of the measuring cylinder assembly, the sampling control frame includes a sampling bracket, a syringe assembly arranged above one side of the sampling bracket and a sampling suction assembly below, each syringe assembly includes a syringe, a syringe plug is installed at the upper end opening of the syringe, and a syringe air connection is provided on the syringe plug The head and syringe liquid connector, the sampling suction assembly includes a pumping pump, a two-position five-way valve, a two-position two-way valve group and a pressure relief valve, the two-position two-way valve group is provided with an inlet and an outlet consistent with the number of measuring cylinders in each measuring cylinder unit, the number of pressure relief valves is also consistent with the number of measuring cylinders in each measuring cylinder unit, the pressure relief valve is connected to the sampling bracket through a pressure relief valve plate, the pipette lifting control unit is arranged on the other side of the sampling bracket, the upper end of the pipette lifting control unit is connected to the pipette consistent with the number of measuring cylinders in each measuring cylinder unit, the discharge unit is arranged on the lateral moving unit on the other side of the measuring cylinder assembly, including a connecting frame, a discharge electric push rod longitudinally and horizontally connected to the connecting frame, and a discharge frame connected to the other end of the discharge electric push rod, and discharge pipes consistent with the number of measuring cylinders in each measuring cylinder unit are arranged on both sides of the discharge frame;

[0005] The air inlet connector of the whipping pump is connected to the A connector of the two-position five-way valve, the air outlet connector of the whipping pump is connected to the B connector of the two-position five-way valve, the P connector of the two-position five-way valve is connected to the inlet of the two-position two-way valve group, each outlet of the two-position two-way valve group is respectively connected to the first interface of a three-way valve, the second interface of the three-way valve is connected to a pressure relief valve, the third interface of the three-way valve is connected to the syringe air connector, the syringe liquid connector is connected to a suction pipe through a second one-way valve, a suction pipe sensor is provided on the pipeline connecting the syringe liquid connector and the suction pipe and above the second one-way valve, and the lower end opening of the syringe is connected to a discharge pipe through the first one-way valve;

[0006] The sample box assembly is provided with at least two groups, each group of sample box assemblies includes a plurality of sample box units arranged closely in a transverse direction, each sample box unit includes sample boxes having the same number as the measuring cylinders in each measuring cylinder unit, the distribution form of the sample boxes is the same as the distribution form of the drainage tubes on the drainage rack, and the sample box assembly is arranged at the rear side of the measuring cylinder assembly;

[0007] The lateral moving unit, the suction tube lifting control unit, the pumping pump, the two-position five-way valve, the two-position two-way valve group, the pressure relief valve, the liquid discharge electric push rod, and the suction tube sensor are all connected to the control component signal.

[0008] Preferably, the transverse moving unit includes two transverse slide rails, a main driving rod assembly, a slave driving rod assembly and a driving motor assembly, which are respectively arranged on the front and rear sides of the bracket, a transverse slider is matched on the transverse slide rail, and two ends of the main driving rod assembly are respectively rotatably connected to the bracket at the same end of the two transverse slide rails. The main driving rod assembly includes a main driving rod, and the main driving rod is fixedly provided with a main driving pulley at the position above the two transverse slide rails. A motor pulley is also fixed on the main driving rod, and the driving motor assembly is connected to the motor pulley through a motor synchronous belt, and the two ends of the slave driving rod assembly are respectively rotatably connected to the bracket at the other end of the two transverse slide rails. The slave driving rod assembly includes a slave driving rod, and the slave driving rod is fixedly provided with a slave driving pulley at the position above the two transverse slide rails. The transverse synchronous belt is connected to the transverse slider on the same side, and a transverse synchronous belt is sleeved between the main driving pulley and the slave driving pulley on the same side. The sampling control frame is fixedly arranged on the transverse slider in front of the measuring cylinder assembly, and the connecting frame is fixedly arranged on another transverse slider.

[0009] Further preferably, a transverse slider is matched on the transverse slide rail behind the sample box assembly, and the two ends of the transverse synchronous belt on this side are fixedly clamped on the upper surface of the transverse slider through a synchronous belt pressure plate, and two transverse connecting plates are fixedly arranged on the synchronous belt pressure plate, and a hole for the transverse synchronous belt to pass through is formed between the two transverse connecting plates, and the connecting frame is fixedly arranged on the upper surface of one transverse connecting plate;

[0010] Two transverse sliders are matched on the transverse slide rail in front of the measuring cylinder assembly. The lower belt body of the transverse synchronous belt on this side is fixedly clamped on the upper surfaces of the two transverse sliders through a synchronous belt pressure plate. Two transverse connecting plates are fixedly arranged on the synchronous belt pressure plates of the two transverse sliders. A hole is formed between the two transverse connecting plates for the upper belt body of the transverse synchronous belt to pass through. The sampling control frame is fixedly arranged on the upper surfaces of the two transverse connecting plates.

[0011] Further preferably, the pipette lifting control unit comprises a lifting electric push rod and a pipette bracket, the lower end of the lifting electric push rod is fixed on the sampling control frame, and the upper end is connected to the pipette bracket, and the upper end of the pipette is connected to the pipette bracket;

[0012] A lifting sensor assembly is provided on one side of the sampling bracket where the pipette lifting control unit is arranged. The lifting sensor assembly includes a plurality of lifting sensors for sensing metal and a lifting sensor sensing plate. The plurality of lifting sensors are fixed to different heights of the sampling bracket through a lifting sensor connecting plate. The upper end of the lifting sensor sensing plate is connected to the pipette bracket, and the lower end of the lifting sensor sensing plate is provided with a sensing metal head. The lifting sensor is connected to the control assembly.

[0013] Further preferably, a syringe liquid level sensor is provided on the sampling bracket at the position corresponding to each syringe, and a discharge sensor is provided on each discharge tube, and both the syringe liquid level sensor and the discharge sensor are connected to the control component.

[0014] Further preferably, it also includes a water inlet-stirring-drainage component, which includes a water inlet bucket, a drainage bucket, a water inlet-circulation pump rack, a drainage pump rack, and an inlet nozzle arranged on the outer wall of the measuring cylinder, a circulation pipe, and a drainage joint arranged at the bottom of the measuring cylinder. The water inlet-circulation pump rack is provided with a water inlet pump pair and a two-position three-way valve. The number of the water inlet pump pairs is the same as the number of the measuring cylinders, the number of the two-position three-way valves is twice the number of the measuring cylinders, the water outlet joints of the two water inlet pumps in the water inlet pump pair are connected to a first three-way pipe, and the drainage pump rack is provided with a first three-way valve having the same number as the measuring cylinders. The same drainage pump; the water inlet bucket is connected to the normally closed joints of two two-position three-way valves through two water inlet pipes, the water inlet joints of the two water inlet pumps in the water inlet pump pair are respectively connected to the drainage joints of a two-position three-way valve, the remaining connection port of the first three-way pipe is connected to the inlet nozzle, the remaining joints of the two two-position three-way valves are commonly connected to a second three-way pipe, the remaining joints of the second three-way pipe are connected to the circulation pipe, the discharge joint is connected to the drainage pump through the drainage two-position two-way valve, and the drainage pump is connected to the drainage bucket; the water inlet pump pair, the two-position three-way valve, and the drainage pump are all connected to the control component.

[0015] Further preferably, a measuring cylinder liquid level sensor is provided on the measuring cylinder, and the measuring cylinder liquid level sensor is connected to the control component; a waste discharge sensor is provided on the pipeline between the water outlet joint of the drain pump and the drain bucket, and the waste discharge sensor is connected to the control component.

[0016] It is further preferred that a clean water groove is provided on the bracket and on one side of the measuring cylinder assembly, and a drainage groove is provided on the same side of the sample box assembly; in order to identify that the sampling control frame has returned to the origin, as an improvement, a sampling control frame origin sensor that senses metal is provided on the bracket at the origin position of the sampling control frame, the rear side shell of the sampling bracket is a metal shell, and the sampling control frame origin sensor is connected to the control assembly.

[0017] Further preferably, the control component includes a controller and an operation screen, and the controller is connected to the operation screen.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] A type II automated liquid sampling device is provided, in which the sampling process is unmanned, and the stirring action is replaced by machinery instead of manual labor, thereby improving the uniformity of stirring. When sampling, the liquid can be taken strictly at the specified height in the measuring cylinder to avoid inaccurate liquid volume due to simultaneous operation of both hands when manually taking the liquid. The test can be carried out with a large throughput, reducing the operating time of personnel. In summary, when the equipment provided by the present invention is used for sampling, the sampling quality and stability can be improved, while reducing the number of operators and improving efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The overall structure diagram of the type II automated liquid sampling device provided by the present invention;

[0021] Figure 2 This is a diagram of the sampling assembly structure;

[0022] Figure 3 This is the structural diagram of the sampling control frame;

[0023] Figure 4 This is a structural diagram of the sampling control frame from another angle;

[0024] Figure 5 This is an exploded view of the syringe assembly;

[0025] Figure 6 It is a structural diagram of the sampling and suction assembly;

[0026] Figure 7 It is the connection structure diagram of the pressure relief valve and the pressure relief valve plate;

[0027] Figure 8 This is the structure diagram of the pipette lifting control unit;

[0028] Fig. 9It is the structural diagram of the drainage unit;

[0029] Fig.10 This is the connection principle diagram of the suction and discharge pipelines;

[0030] Fig.11 It is the structural diagram of the lateral movement unit;

[0031] Fig.12 This is the structural diagram of the main driving rod close to the measuring cylinder;

[0032] Fig.13 This is the structural diagram of the part close to the measuring cylinder from the driving rod;

[0033] Fig.14 It is a structural diagram of a slider connected to a transverse synchronous belt;

[0034] Fig.15 for Fig.11 A magnified view of position A;

[0035] Fig.16 It is a connection structure diagram of the lifting sensor and the lifting sensor connection plate;

[0036] Fig.17 This is the position diagram of the water inlet-circulation pump bracket under the bracket;

[0037] Fig.18 This is a diagram showing the relationship between the drainage pump stand, water inlet bucket, drainage bucket and bracket positions;

[0038] Fig.19 This is the structure diagram of the measuring cylinder;

[0039] Fig. 20 This is the exploded diagram of the measuring cylinder;

[0040] Fig.21 This is the structural diagram of the water inlet-circulation pump frame;

[0041] Fig. 22 This is the structural diagram of the water inlet-circulation pump frame from another angle;

[0042] Fig.23 This is the structural diagram of the first drainage pump frame;

[0043] Fig.24 This is the structural diagram of the second drainage pump frame;

[0044] Fig.25 This is the schematic diagram of the water inlet-mixing-drainage pipeline connection;

[0045] Fig.26 This is the location diagram of the origin sensors of the clean water tank, drainage tank, and sampling control rack on the bracket;

[0046] Fig. 27 A diagram showing the position of the control assembly on the bracket;

[0047] Fig.28 This is a schematic diagram of the location of the first drag chain. DETAILED DESCRIPTION

[0048] The present invention is further described and explained below in conjunction with the accompanying drawings, but does not constitute a limitation of the present invention.

[0049] refer to Figure 1-Figure 28 The present invention provides a type II automatic liquid sampling device, comprising a support 1 and a measuring cylinder assembly, a sampling assembly and a control assembly arranged on the support 1. The measuring cylinder assembly comprises five measuring cylinder units arranged closely in the horizontal direction, each measuring cylinder unit comprises six measuring cylinders 2, and the six measuring cylinders 2 are arranged on the support 1 through a measuring cylinder support 77; the sampling assembly comprises a lateral moving unit, a sampling unit arranged on the lateral moving unit and a sample box assembly arranged on the support 1, the sampling unit comprises a sampling control frame 3, a pipette lifting control unit, a pipette 4 and a liquid discharge unit, the sampling control frame 3 is arranged on the lateral moving unit on one side of the measuring cylinder assembly, the sampling control frame 3 comprises a sampling support 5, a syringe assembly 6 arranged above one side of the sampling support 5 and a sampling suction assembly below, each syringe assembly 6 comprises a syringe 7, a syringe plug 8 is installed on the upper end opening of the syringe 7, a syringe gas joint 9 and a syringe liquid joint 10 are arranged on the syringe plug 8, and the sampling suction assembly 10 is arranged on the syringe plug 8. The suction assembly is arranged on the pneumatic plate 73, including a pumping pump 11, a two-position five-way valve 12, a two-position two-way valve group 13 and a pressure relief valve 15. The two-position two-way valve group 13 is provided with an inlet and six outlets. The number of the pressure relief valves 15 is also consistent with the number of measuring cylinders 2 in each measuring cylinder unit. The pressure relief valve 15 is connected to the pneumatic plate 73 connected to the sampling bracket 5 through the pressure relief valve plate 71. The pipette lifting control unit is arranged on the other side of the sampling bracket 5. The upper end of the pipette lifting control unit is connected to six pipettes 4. The discharge unit is arranged on the lateral moving unit on the other side of the measuring cylinder assembly, including a connecting frame 16, a discharge electric push rod 17 longitudinally and horizontally connected to the connecting frame 16, and a discharge frame 18 connected to the other end of the discharge electric push rod 17. Six discharge pipes 19 are arranged on both sides of the discharge frame 18. In order to facilitate the arrangement, a top cover 72 is provided above the sampling bracket 5, and the syringe air joint 9 and the syringe liquid joint 10 pass through the top cover 72. In order to manage various connecting pipelines, a support rod 74 is provided on the drainage unit, a protection pipe bracket 75 is provided on the support rod 74, a protection pipe 76 is provided between the protection pipe bracket 75 and the top cover 72, and all connecting pipelines pass through the protection pipe 76.

[0050] The air inlet connector of the whipping pump 11 is connected to the A connector of the two-position five-way valve 12, the air outlet connector of the whipping pump 11 is connected to the B connector of the two-position five-way valve 12, the P connector of the two-position five-way valve 12 is connected to the inlet of the two-position two-way valve group 13, each outlet of the two-position two-way valve group 13 is respectively connected to a first interface of a three-way valve 20, the second interface of the three-way valve 20 is connected to a pressure relief valve 15, the third interface of the three-way valve 20 is connected to the syringe air connector 9, the syringe liquid connector 10 is connected to a suction pipe 4 through the second one-way valve 14, a suction pipe sensor 66 is provided on the pipeline connecting the syringe liquid connector 10 and the suction pipe 4 and above the second one-way valve 14, and the lower end opening of the syringe 7 is connected to a discharge pipe 19 through the first one-way valve 43;

[0051] There are at least two groups of sample box assemblies, each group of sample box assemblies includes a plurality of sample box units closely arranged transversely, each sample box unit includes six sample boxes 21, the distribution form of the sample boxes 21 is the same as the distribution form of the drainage tubes 19 on the drainage rack 18, and the sample box assembly is arranged at the rear side of the measuring cylinder assembly;

[0052] The lateral moving unit, the pipette lifting control unit, the pumping pump 11, the two-position five-way valve 12, the two-position two-way valve group 13, the pressure relief valve 15, the liquid discharge electric push rod 17, and the pipette sensor 66 are all connected to the control component signal.

[0053] The working process of this equipment includes the following steps:

[0054] 1) Pour the sample liquid into the measuring cylinder 2, and select the measuring cylinder 2 for placing the sample liquid and the relevant experimental operating conditions through the control component;

[0055] 2) Stirring the sample liquid, and when the sample liquid is still, the pipette lifting control unit controls the pipette 4 to rise until the lower end surface of the pipette 4 is higher than the upper end of the measuring cylinder 2;

[0056] 3) The horizontal moving unit starts, driving the sampling control frame 3 to the working origin;

[0057] 4) The lateral moving unit drives the sampling control frame 3 to move to the position corresponding to the measuring cylinder 2, and at this time, the six pipettes 4 are located directly above the six measuring cylinders 2;

[0058] 5) The pipette lifting control unit controls the six pipettes 4 to descend until the lower ends of the pipettes 4 reach the sampling height in the measuring cylinder 2;

[0059] 6) When the two-position five-way valve A and P are connected, in the sampling pipeline, the pumping pump 11, the two-position five-way valve 12, the two-position two-way valve group 13, the three-way valve 20, the pressure relief valve 15, the syringe gas joint 9 and the syringe 7 are connected through pipes to form a pipeline I; the measuring cylinder 2, the pipette 4, the second one-way valve 14, the syringe liquid joint 10 and the syringe 7 are connected through pipes to form a pipeline II; when the two-position five-way valve B and P are connected, in the sampling pipeline, the pumping pump 11, the two-position five-way valve 12, the two-position two-way valve group 13, the three-way valve 20, the syringe gas joint 9 and the syringe 7 form a pipeline III. When the two-position five-way valve A and P are connected, the pipeline I is connected to the suction joint of the pump 11. When the pump 11 is started, the pressure relief valve 15 is closed, the two-position two-way valve group 13 is opened, the pump 11 generates suction, and negative pressure is generated in the pipeline I, and the syringe 7 is also under negative pressure; the pipette 4 is connected to the syringe 7 in the pipeline II, and the pipeline II is also under negative pressure; the pipette 4 is inserted into the sample liquid, and since the syringe 7 is under negative pressure, the sample liquid enters the syringe 7 along the pipeline II. When the sample liquid level in the syringe 7 reaches the target height, the control component controls the valve of the two-position two-way valve group 13 to close, and the pressure relief valve 15 works at the same time to unload the pressure in the syringe 7 and ensure the accuracy of the liquid volume taken in the syringe 7. When the sample liquid is taken from the six syringes 7, that is, when the six pressure relief valves are all working, the pump 11 is closed. After the pump 11 stops working, the pipette lifting control unit controls the pipette 4 to rise and leave the sample liquid surface. The above-mentioned liquid suction work is completed again, the purpose is to suck the liquid in pipeline II into the syringe 7. When there is liquid in the pipeline, the pipette sensor 66 set in the pipeline above the second one-way valve 14 works. When there is no liquid in the pipeline, the pipette sensor 66 stops working and closes the valve of the two-position two-way valve group 13 of this pipeline. When the two-position two-way valve group 13 is completely closed, the pumping pump 11 stops. When the two-position five-way valve B and P are connected, and the pipeline III is connected to the air outlet joint of the pumping pump 11, the pumping pump 11 works, the two-position two-way valve group 13 opens, the pumping pump 11 generates thrust, and positive pressure is generated in the pipeline III, and positive pressure is also generated in the syringe 7. When the pressure is greater than the opening pressure of the spring-type first one-way valve 43, the sample liquid passes through the liquid pipe I 81, the first one-way valve 43 and the liquid pipe II 67, and is discharged from the liquid discharge pipe 19 and enters the sample box 21. When there is no liquid in the liquid pipe II 67, close the valve of the two-position two-way valve group 13. When the sample liquid in the syringe 7 is discharged to the sample box 21, close the pumping pump 11 to complete the sampling; the second one-way valve 14 and the first one-way valve are spring-loaded one-way valves, which need to reach a certain pressure before they can be opened. The second one-way valve 14 can ensure that when the syringe 7 is under positive pressure, the gas will not be discharged from the pipette 4, and the gas can only push the liquid to be discharged. Since the gravity of the liquid in the syringe 7 is less than the opening pressure of the first one-way valve 43, and the connecting tube between the lower end of the syringe 7 and the discharge tube 19 is located at one end of the syringe 7 and is U-shaped, the highest end is higher than the upper end surface of the syringe 7, which can effectively prevent the liquid in the syringe 7 from flowing out due to gravity;

[0060] 7) When it is necessary to sample the same sample twice, repeat steps 3) to 6) to sample all sample liquids for the second time. Before the second sampling, the liquid discharge electric push rod 17 is started to extend the liquid discharge pipe 19 above the second group of sample boxes 21 to discharge liquid into the second group of sample boxes 21;

[0061] 8) Clean the measuring cylinder and related pipelines.

[0062] As a specific implementation method of the lateral movement unit, the lateral movement unit includes two lateral slide rails 22, a main drive rod assembly, a slave drive rod assembly and a drive motor assembly 27, which are respectively arranged on the front and rear sides of the bracket 1. A lateral slider 23 is matched on the lateral slide rail 22. The two ends of the main drive rod assembly are respectively rotatably connected to the bracket 1 at the same end of the two lateral slide rails 22. The main drive rod assembly includes a main drive rod 24. The main drive rod 24 is located above the two lateral slide rails 22 and is fixed with a main drive pulley 25. A motor pulley 26 is also fixed on the main drive rod 24. The drive motor assembly 27 is driven by a motor The synchronous belt 28 is connected to the motor pulley 26, and the two ends of the slave drive rod assembly are respectively rotatably connected to the bracket 1 at the position of the other end of the two transverse slides 22. The slave drive rod assembly includes a slave drive rod 29, and the slave drive pulley 30 is fixedly provided at the position above the two transverse slides 22. The transverse synchronous belt 31 is connected to the transverse slider 23 on the same side, and a transverse synchronous belt 31 is sleeved between the main drive pulley 25 and the slave drive pulley 30 on the same side. The sampling control frame 3 is fixedly set on the transverse slider 23 in front of the measuring cylinder assembly, and the connecting frame 16 is fixedly set on the other transverse slider 23. In order to facilitate installation, the main drive rod 24 and the slave drive rod 29 can be set in the form of two sections, and the two sections are connected by a coupling. The main drive rod 24 and the slave drive rod 29 are supported by a fixed seat.

[0063] When the lateral moving unit controls the lateral movement of the sampling control frame 3, the driving motor assembly 27 drives the main driving rod 24 to rotate through the motor synchronous belt 28 and the motor pulley 26. The main driving rod 24 drives the lateral slider 23 to move along the two lateral slide rails 22 through two lateral synchronous belts 31, thereby driving the sampling control frame 3 and the discharge unit to move lateral.

[0064] In order to make the connection of the sampling control frame 3 more stable, as an improvement of the technical solution, a transverse slider 23 is matched on the transverse slide rail 22 behind the sample box assembly, and the two ends of the transverse synchronous belt 31 on this side are fixedly clamped on the upper surface of the transverse slider 23 through a synchronous belt pressing plate 64, and two transverse connecting plates 65 are fixedly arranged on the synchronous belt pressing plate 64, and a hole for the transverse synchronous belt 31 to pass through is formed between the two transverse connecting plates 65, and the connecting frame 16 is fixedly arranged on the upper surface of a transverse connecting plate 65;

[0065] Two transverse sliders 23 are matched on the transverse slide rail 22 in front of the measuring cylinder assembly. The lower belt body of the transverse synchronous belt 31 on this side is fixedly clamped on the upper surfaces of the two transverse sliders 23 through the synchronous belt pressure plate 64. Two transverse connecting plates 65 are fixedly set on the synchronous belt pressure plates 64 of the two transverse sliders 23. A hole is formed between the two transverse connecting plates 65 for the upper belt body of the transverse synchronous belt 31 to pass through. The sampling control frame 3 is fixedly set on the upper surfaces of the two transverse connecting plates 65.

[0066] As a specific implementation method of the pipette lifting control unit, the pipette lifting control unit includes a lifting electric push rod 32 and a pipette bracket 33. The lower end of the lifting electric push rod 32 is fixed on the sampling control frame 3, and the upper end is connected to the pipette bracket 33, and the upper end of the pipette 4 is connected to the pipette bracket 33; when lifting is required, the height of the pipette bracket 33 is controlled by lifting the lifting electric push rod 32, thereby controlling the height of the pipette 4.

[0067] A lifting sensor assembly is provided on one side of the sampling bracket 5 where the pipette lifting control unit is provided. The lifting sensor assembly includes a plurality of lifting sensors 45 sensing metals and a lifting sensor sensing plate 46. The plurality of lifting sensors 45 are fixed to different heights of the sampling bracket 5 via a lifting sensor connecting plate 47. The upper end of the lifting sensor sensing plate 46 is connected to the pipette bracket 33. The lower end of the lifting sensor sensing plate 46 is provided with a sensing metal head 48. The lifting sensor 45 is connected to the control assembly.

[0068] When the lifting electric push rod 32 drives the pipette 4 to rise, it also drives the lifting sensor induction plate 46 to rise. The sensing metal head 48 senses the lifting sensor 45 at different positions. After receiving the signal through the control component, the lifting electric push rod 32 is controlled to stop at the target height.

[0069] In order to realize the automatic control of the liquid level in the syringe 7 and the action after the completion of the discharge, a syringe liquid level sensor 49 is provided on the sampling bracket 5 at the corresponding position of each syringe 7, and a discharge sensor 44 is provided on each discharge pipe 19. The syringe liquid level sensor 49 and the discharge sensor 44 are both connected to the control component. During the sampling process, the discharge sensor 44 detects whether there is sample liquid in the discharge pipe 19. When the sample liquid completely flows into the sample box 21, the discharge sensor 44 transmits a signal to the control component, and the control component controls to close the pumping pump 11.

[0070] In order to dissolve the diluted sample liquid, and at the same time to discharge waste and clean the pipeline, as an improvement of the technical solution, it also includes a water inlet-stirring-drainage component, which includes a water inlet bucket 34, a drainage bucket 35, a water inlet-circulation pump rack 36, a drainage pump rack 68 and an inlet nozzle pipe 37 and a circulation pipe 38 arranged on the outer wall of the measuring cylinder 2, and a drainage joint 39 arranged at the bottom of the measuring cylinder 2. The inlet nozzle pipe 37 passes through the measuring cylinder 2 and is connected to the nozzle 80 through the nozzle joint 79. The circulation pipe 38 is connected to the circulation joint 78, and the circulation joint 78 passes through the measuring cylinder 2. There are a water inlet pump pair 40 and a two-position three-way valve 42 on the water inlet-circulation pump rack 36. The number of the water inlet pump pair 40 is the same as the number of the measuring cylinder 2, and the number of the two-position three-way valves 42 is twice the number of the measuring cylinder 2. Two of the water inlet pump pairs 40 The outlet joint of the water inlet pump is connected to a first three-way pipe 69, and the drainage pump frame 68 is provided with drainage pumps 41 of the same number as the measuring cylinder 2; the water inlet barrel 34 is connected to the normally closed joints of the two two-position three-way valves 42 through two water inlet pipes, and the water inlet joints of the two water inlet pumps in the water inlet pump pair 40 are respectively connected to the drainage joints of a two-position three-way valve 42, the remaining connection port of the first three-way pipe 69 is connected to the inlet nozzle 37, and the remaining joints of the two two-position three-way valves 42 are jointly connected to a second three-way pipe 70, and the remaining joints of the second three-way pipe 70 are connected to the circulation pipe 38, and the drainage joint 39 is connected to the drainage pump 41 through the drainage two-position two-way valve 58, and the drainage pump 41 is connected to the drainage barrel 35; the water inlet pump pair 40, the two-position three-way valve pair 42, and the drainage pump 41 are all connected to the control assembly. The water inlet-circulation pump frame 36, the first drainage pump frame, the second drainage pump frame, the water inlet barrel 34, and the drainage barrel 35 are all arranged below the measuring cylinder assembly and the sample box assembly.

[0071] After adding the sample liquid to the vector cylinder 2, first add pure water to the vector cylinder 2, then stir, then take samples, discharge waste after sampling, and wash after discharge. Since the sampling process has been explained clearly, the process of adding pure water, stirring, discharging waste, and washing after discharge is explained here. Adding pure water and stirring include the following steps:

[0072] a) The water inlet pump pair 40 and the two two-position three-way valves 42 connected thereto are started, and the purified water is respectively injected from the water inlet barrel 34 through the normally closed joints of the two two-position three-way valves 42, the water inlet pump 40, the first three-way pipe 69, the inlet nozzle 37, the nozzle 80, and finally into the measuring cylinder 2. When the water level in the measuring cylinder 2 reaches the target height, the two two-position three-way valves 42 are stopped, the internal pipelines are switched, and the water inlet function is stopped;

[0073] b) At this time, the measuring cylinder 2, the circulation pipe 38, the second three-way pipe 70, the two two-position three-way valves 42 are normally open, the water inlet pump pair 40, the first three-way pipe 69, the inlet nozzle 37 and the nozzle 80 form a circulation pipeline. Since the liquid level is higher than the circulation joint position, the water inlet pump pair 40 is still in operation. At this time, the liquid in the measuring cylinder 2 is sucked into the circulation pipeline through the circulation pipe 38, and the liquid passes through the circulation pipe 38, the second three-way pipe 70, the two two-position three-way valves 42 are normally open, the water inlet pump pair 40, the first three-way pipe 69, the inlet nozzle 37, and finally sprayed out from the nozzle 80 and returned to the measuring cylinder 2. The water jet sprayed out by the nozzle 80 rolls up the precipitated sample liquid at the bottom of the measuring cylinder 2, and the circulation pipe 38 on the upper part of the measuring cylinder 2 has suction at this time, sucking the sample liquid, and through the cooperation of the bottom and the upper part, the phenomenon of rolling up the sample liquid is achieved, and the phenomenon of the sample liquid moving upward is generated, and stirring is achieved. When the stirring is completed, the water inlet pump pair 40 is closed.

[0074] The waste discharge and post-waste cleaning process includes the following steps:

[0075] 1) The drainage pump 41 is turned on to drain the sample liquid in the measuring cylinder 2 into the drainage bucket 35 through the drainage two-position two-way valve 58, and the drainage pump 41 is turned off after the drainage is completed;

[0076] b) Repeat steps a) and b);

[0077] 3) Simultaneously open the water inlet pump pair 40, the drain pump 41 and the two-position three-way valve 42. After the cleaning is completed, close the water inlet pump pair 40, the drain pump 41 and the two-position three-way valve 42 at the same time; repeat the cleaning process according to regulations.

[0078] In order to sense the liquid level in the measuring cylinder 2 and control the waste discharge process, a measuring cylinder level sensor 57 is provided on the measuring cylinder 2, and the measuring cylinder level sensor 57 is connected to the control component; a waste discharge sensor 61 is provided on the water outlet joint of the drain pump 41 and the pipeline of the drain bucket 35, and the waste discharge sensor 61 is connected to the control component.

[0079] Preferably, in order to clean the sample liquid in the pipeline and to be able to clean the liquid collection pipeline separately, a clean water tank 53 is provided on the bracket 1 and on one side of the measuring cylinder assembly, and a drainage tank 54 is provided on the same side of the sample box assembly, and a clean water inlet pump 82, a clean water drain pump 83 and a waste pump 84 are provided on the water inlet-circulation pump rack 36. The clean water tank 53 is connected to the clean water inlet pump 82 and the clean water drain pump 83 through a pipeline, and the drainage tank 54 is connected to the waste pump 84 through a pipeline.

[0080] During the experiment, water is pumped into the clean water tank 53 through the clean water inlet pump 82. After the experiment, the water in the clean water tank 53 is discharged through the clean water discharge pump 83.

[0081] When the suction pipeline needs to be cleaned, water is injected into the clean water tank 53 through the clean water inlet pump 82. After the suction pipeline is cleaned, the clean water discharge pump 83 discharges the liquid in the clean water tank 53, and the liquid in the drainage tank 54 is discharged through the waste discharge pump 84.

[0082] After the first sampling, some sample liquid still remains on the pipe wall. The lateral moving unit drives the sampling control frame 3 to the working origin, and then moves to the clean water tank 53. Step 5)-step 6) are performed to determine the number of repetitions according to the experimental requirements to ensure that all the sample liquid is discharged and the pipe is clean for the next use.

[0083] When the liquid extraction pipeline needs to be cleaned separately:

[0084] ① The lifting electric push rod 32 rises and reaches the high lifting sensor 45, the lifting sensor 45 works, and the lifting electric push rod 32 stops. At this time, the lower end of the pipette 4 is higher than the upper end of the measuring cylinder 2;

[0085] ② The driving motor assembly 27 is started, and the horizontal slider 23 moves to the origin position, and then moves to the clean water tank 53 position;

[0086] ③ When the lifting electric push rod 32 descends and reaches the middle lifting sensor 45, the lifting sensor 45 works and the lifting electric push rod 32 stops. At this time, the liquid suction tube 4 is located in the clean water tank 53;

[0087] ④Repeat step 6) to complete the cleaning of the liquid extraction pipeline.

[0088] In order to identify that the sampling control rack 3 has returned to the origin, as an improvement, a sampling control rack origin sensor 55 that senses metal is provided on the bracket 1 at the origin position of the sampling control rack 3, the rear shell of the sampling rack 5 is a metal shell, and the sampling control rack origin sensor 55 is connected to the control component. When the sampling rack 5 returns to the origin, the sampling control rack origin sensor 55 senses the rear shell of the sampling rack 5 and sends a signal to the control component.

[0089] Preferably, the control assembly includes a controller 59 and an operation screen 60 , and the controller is connected to the operation screen 60 . Each automation component is connected to the controller 59 .

[0090] In order to manage various wires and signal lines, a first drag chain 85 is provided above the liquid discharge electric push rod 17. One end of the first drag chain 85 is connected to the liquid discharge frame 18 through the first drag chain plate 86, and the other end is connected to the support rod 74. A second drag chain 87 is provided on the front side of the bracket 1, and a third drag chain 88 is provided on the rear side. One end of the second drag chain 87 is connected to the side edge of the measuring cylinder assembly on the bracket 1, and the other end is connected to the sampling bracket. One end of the third drag chain 88 is connected to the side edge of the sample box assembly on the bracket 1, and the other end is connected to the liquid discharge assembly.

Claims

1. A type II automated liquid sampling device, characterized in that: The invention comprises a support (1) and a measuring cylinder assembly, a sampling assembly and a control assembly arranged on the support (1). The measuring cylinder assembly comprises a plurality of measuring cylinder units arranged closely in the transverse direction, and each measuring cylinder unit comprises a plurality of measuring cylinders (2). The sampling assembly comprises a transverse moving unit, a sampling unit arranged on the transverse moving unit and a sample box assembly arranged on the support (1). The sampling unit comprises a sampling control frame (3), a pipette lifting control unit, a pipette (4) and a liquid discharge unit. The sampling control frame (3) is arranged on the transverse moving unit on one side of the measuring cylinder assembly. The sampling control frame (3) comprises a sampling support (5), a syringe assembly (6) arranged above one side of the sampling support (5) and a sampling suction assembly below. Each syringe assembly (6) comprises a syringe (7). A syringe plug (8) is installed at the upper end opening of the syringe (7). A syringe gas joint (9) and a syringe liquid joint (10) are arranged on the syringe plug (8). The sampling suction assembly comprises a pumping pump (11), a two-position pump (12) and a two-position pump (13). A five-way valve (12), a two-position two-way valve group (13) and a pressure relief valve (15), wherein the two-position two-way valve group (13) is provided with an inlet and an outlet whose number is the same as the number of measuring cylinders (2) in each measuring cylinder unit, and the number of pressure relief valves (15) is also the same as the number of measuring cylinders (2) in each measuring cylinder unit. The pressure relief valve (15) is connected to the sampling bracket (5) through a pressure relief valve plate (71), and a pipette lifting control unit is arranged on the other side of the sampling bracket (5). The upper end of the pipette lifting control unit is connected to pipettes (4) whose number is the same as the number of measuring cylinders (2) in each measuring cylinder unit. The liquid discharge unit is arranged on the lateral moving unit on the other side of the measuring cylinder assembly, and comprises a connecting frame (16), a liquid discharge electric push rod (17) connected to the connecting frame (16) in a longitudinal and horizontal manner, and a liquid discharge frame (18) connected to the other end of the liquid discharge electric push rod (17), and liquid discharge pipes (19) whose number is the same as the number of measuring cylinders (2) in each measuring cylinder unit are arranged on both sides of the liquid discharge frame (18); The air inlet connector of the pumping pump (11) is connected to the A connector of the two-position five-way valve (12), the air outlet connector of the pumping pump (11) is connected to the B connector of the two-position five-way valve (12), the P connector of the two-position five-way valve (12) is connected to the inlet of the two-position two-way valve group (13), each outlet of the two-position two-way valve group (13) is respectively connected to the first interface of a three-way valve (20), the second interface of the three-way valve (20) is connected to a pressure relief valve (15), the third interface of the three-way valve (20) is connected to the syringe air connector (9), the syringe liquid connector (10) is connected to a suction pipe (4) through a second one-way valve (14), a suction pipe sensor (66) is provided on the pipeline connecting the syringe liquid connector (10) and the suction pipe (4) and above the second one-way valve (14), and the lower end opening of the syringe (7) is connected to a discharge pipe (19) through a first one-way valve (43); At least two groups of sample box assemblies are provided, each group of sample box assemblies includes a plurality of sample box units that are closely arranged laterally, each sample box unit includes sample boxes (21) whose number is the same as the number of measuring cylinders (2) in each measuring cylinder unit, the distribution form of the sample boxes (21) is the same as the distribution form of the drainage tubes (19) on the drainage rack (18), and the sample box assembly is arranged at the rear side of the measuring cylinder assembly; The lateral movement unit, the suction tube lifting control unit, the pumping pump (11), the two-position five-way valve (12), the two-position two-way valve group (13), the pressure relief valve (15), the liquid discharge electric push rod (17), and the suction tube sensor (66) are all connected to the control component signal.

2. The type II automated liquid sampling device according to claim 1, characterized in that: The transverse moving unit comprises two transverse slide rails (22) respectively arranged on the front and rear sides of the bracket (1), a main drive rod assembly, a slave drive rod assembly and a drive motor assembly (27); a transverse slider (23) is matched on the transverse slide rail (22); two ends of the main drive rod assembly are respectively rotatably connected to the bracket (1) at the same end of the two transverse slide rails (22); the main drive rod assembly comprises a main drive rod (24); a main drive pulley (25) is fixedly provided at the position of the main drive rod (24) above the two transverse slide rails (22); a motor pulley (26) is also fixedly provided on the main drive rod (24); the drive motor assembly (27) is connected to the motor pulley via a motor synchronous belt (28). The two ends of the slave drive rod assembly are respectively rotatably connected to the bracket (1) at the position where the other ends of the two transverse slide rails (22) are located. The slave drive rod assembly includes a slave drive rod (29). The slave drive rod (29) is fixedly provided with a slave drive pulley (30) at a position above the two transverse slide rails (22). The transverse synchronous belt (31) is connected to the transverse slider (23) on the same side. A transverse synchronous belt (31) is sleeved between the main drive pulley (25) and the slave drive pulley (30) on the same side. The sampling control frame (3) is fixedly arranged on the transverse slider (23) in front of the measuring cylinder assembly, and the connecting frame (16) is fixedly arranged on the other transverse slider (23).

3. The type II automated liquid sampling device according to claim 2, characterized in that: A transverse slider (23) is matched on the transverse slide rail (22) behind the sample box assembly, and the two ends of the transverse synchronous belt (31) on this side are fixedly clamped on the upper surface of the transverse slider (23) through a synchronous belt pressure plate (64), and two transverse connecting plates (65) are fixedly arranged on the synchronous belt pressure plate (64), and a hole for the transverse synchronous belt (31) to pass through is formed between the two transverse connecting plates (65), and the connecting frame (16) is fixedly arranged on the upper surface of a transverse connecting plate (65); Two transverse sliders (23) are matched on the transverse slide rail (22) in front of the measuring cylinder assembly. The lower belt body of the transverse synchronous belt (31) on this side is fixedly clamped on the upper surfaces of the two transverse sliders (23) through a synchronous belt pressure plate (64). Two transverse connecting plates (65) are fixedly arranged on the synchronous belt pressure plates (64) of the two transverse sliders (23). A hole is formed between the two transverse connecting plates (65) for the upper belt body of the transverse synchronous belt (31) to pass through. The sampling control frame (3) is fixedly arranged on the upper surfaces of the two transverse connecting plates (65).

4. The type II automated liquid sampling device according to claim 1, characterized in that: The pipette lifting control unit comprises a lifting electric push rod (32) and a pipette support (33); the lower end of the lifting electric push rod (32) is fixed to the sampling control frame (3), and the upper end is connected to the pipette support (33); the upper end of the pipette (4) is connected to the pipette support (33); A lifting sensor assembly is provided on one side of the sampling support (5) where the pipette lifting control unit is provided. The lifting sensor assembly includes a plurality of lifting sensors (45) sensing metals and a lifting sensor sensing plate (46). The plurality of lifting sensors (45) are fixed to different heights of the sampling support (5) via a lifting sensor connecting plate (47). The upper end of the lifting sensor sensing plate (46) is connected to the pipette support (33). The lower end of the lifting sensor sensing plate (46) is provided with a sensing metal head (48). The lifting sensor (45) is connected to the control assembly.

5. The type II automated liquid sampling device according to claim 1, characterized in that: A syringe liquid level sensor (49) is provided on the sampling bracket (5) at a position corresponding to each syringe (7), and a liquid discharge sensor (44) is provided on each liquid discharge pipe (19). Both the syringe liquid level sensor (49) and the liquid discharge sensor (44) are connected to the control component.

6. The type II automated liquid sampling device according to claim 1, characterized in that: The invention also comprises a water inlet-stirring-drainage assembly, which comprises a water inlet bucket (34), a drainage bucket (35), a water inlet-circulation pump frame (36), a drainage pump frame (68), an inlet spray pipe (37) arranged on the outer wall of the measuring cylinder (2), a circulation pipe (38), and a drainage joint (39) arranged at the bottom of the measuring cylinder (2); a water inlet pump pair (40) and a two-position three-way valve (42) are arranged on the water inlet-circulation pump frame (36); the number of the water inlet pump pair (40) is the same as the number of the measuring cylinder (2); the number of the two-position three-way valve (42) is twice the number of the measuring cylinder (2); the water outlet joints of the two water inlet pumps in the water inlet pump pair (40) are connected to a first three-way pipe (69); the drainage pump frame (68) is provided with a first three-way valve (42) which is the same as the number of the measuring cylinder (2); A drainage pump (41); the water inlet bucket (34) is connected to the normally closed joints of two two-position three-way valves (42) through two water inlet pipes; the water inlet joints of the two water inlet pumps in the water inlet pump pair (40) are respectively connected to the drainage joints of a two-position three-way valve (42); the remaining connection port of the first three-way pipe (69) is connected to the inlet spray pipe (37); the remaining joints of the two two-position three-way valves (42) are commonly connected to a second three-way pipe (70); the remaining joint of the second three-way pipe (70) is connected to the circulation pipe (38); the drainage joint (39) is connected to the drainage pump (41) through the drainage two-position two-way valve (58); and the drainage pump (41) is connected to the drainage bucket (35); the water inlet pump pair (40), the two-position three-way valve (42), and the drainage pump (41) are all connected to the control component.

7. The type II automated liquid sampling device according to claim 6, characterized in that: A measuring cylinder liquid level sensor (57) is provided on the measuring cylinder (2), and the measuring cylinder liquid level sensor (57) is connected to the control component; a waste discharge sensor (61) is provided on the pipeline between the water outlet joint of the drainage pump (41) and the drainage bucket (35), and the waste discharge sensor (61) is connected to the control component.

8. The type II automated liquid sampling device according to claim 6, characterized in that: A clean water groove (53) is provided on the bracket (1) and on one side of the measuring cylinder assembly, and a drainage groove (54) is provided on the same side of the sample box assembly; a sampling control frame origin sensor (55) inductive to metal is provided on the bracket (1) at the origin position of the sampling control frame (3); the rear shell of the sampling bracket (5) is a metal shell, and the sampling control frame origin sensor (55) is connected to the control assembly.

9. The type II automated liquid sampling device according to claim 1, characterized in that: The control component comprises a controller (59) and an operating screen (60), and the controller is connected to the operating screen (60).

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