Ion chromatograph for leather detection

Abstract

The application relates to the technical field of ion chromatographs, and discloses an ion chromatograph for leather detection, which comprises an automatic dilution unit, a flange, an online filtering unit and an ion chromatograph body. The automatic dilution unit and the online filtering unit are connected through the flange thread, the connection mode is relatively stable, the connection reliability between the components during the operation of the instrument can be guaranteed, meanwhile, the threaded connection is convenient to disassemble and maintain, the internal components can be conveniently inspected, cleaned or replaced, the 5-micron stainless steel sintered filter element arranged in the online filtering unit has good corrosion resistance and mechanical strength, is suitable for use in the environment of leather detection which may contact various chemicals, and the 5-micron precision can effectively filter the sample, remove larger particle impurities and guarantee the purity of the sample in the subsequent detection process.

Description

Technical Field

[0001] This application relates to the field of ion chromatography technology, specifically to an ion chromatograph for leather detection. Background Technology

[0002] Ion chromatography, as a highly efficient analytical instrument, has been widely used in environmental monitoring, food testing, chemical production and other fields. In the leather industry, due to the potential presence of harmful ions in the chemical auxiliaries (such as plasticizers and stabilizers) used in the production process, traditional detection methods (such as titration and spectrophotometry) suffer from problems such as long processing time, low sensitivity, and susceptibility to interference.

[0003] In recent years, ion chromatography technology has gradually become the mainstream method for ion detection in leather due to its advantages such as high selectivity, high sensitivity and high degree of automation. However, existing ion chromatographs for leather still have technical bottlenecks such as complex structure, high maintenance cost and cumbersome sample pretreatment, which urgently need to be optimized and improved. In order to solve the above problems, an ion chromatograph for leather detection is proposed. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application provides an ion chromatograph for leather detection, which has advantages such as small size and easy deployment, and solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: an ion chromatograph for leather detection, comprising an automatic dilution unit, a flange, an online filtration unit, and an ion chromatograph body. The bottom of the automatic dilution unit is connected to the online filtration unit via a flange thread. The online filtration unit has a stainless steel sintered filter element inside. The automatic dilution unit is identified as A1, the online filtration unit is identified as A2, and the stainless steel sintered filter element is 5μm thick.

[0006] The above scheme, by setting up an automatic dilution unit, allows the automatic dilution unit and the online filtration unit to be connected via flange threads. This connection method is relatively stable and can ensure the reliability of the connection between various components during instrument operation. At the same time, the threaded connection facilitates disassembly and maintenance, making it convenient to inspect, clean, or replace internal components. By setting up the online filtration unit, a 5μm stainless steel sintered filter element can be installed inside. Stainless steel has good corrosion resistance and mechanical strength, making it suitable for use in environments such as leather testing where it may come into contact with various chemicals. The 5μm precision can effectively filter samples, remove larger particulate impurities, ensure the purity of samples in subsequent testing processes, avoid impurities interfering with test results, and improve the accuracy of testing.

[0007] Furthermore, a high-pressure infusion pump is fixedly installed at the bottom of the online filtration unit, and an ion chromatograph body is fixedly installed on the surface of the high-pressure infusion pump. The high-pressure infusion pump is a ceramic plunger pump with a flow rate range of 0.1-2.0 mL / min and a pressure resistance of 40 MPa.

[0008] The above scheme involves a high-pressure infusion pump fixedly installed at the bottom of the online filtration unit, with the ion chromatograph body fixedly mounted on the surface of the pump. This layout results in a compact instrument structure, saving space and facilitating overall instrument placement and operation. It also reduces the length of connecting pipes between components, minimizing losses and interference during sample transfer. The use of a ceramic plunger pump as the high-pressure infusion pump offers the following significant advantages: a flow rate range of 0.1... With a flow rate of -2.0 mL / min, this wide flow range can meet the diverse liquid flow rate requirements of different detection projects. The flow rate can be flexibly adjusted according to specific detection requirements to ensure the accuracy and reliability of the detection. The pressure resistance of 40 MPa indicates that the pump can withstand high pressure and adapt to the high-pressure environment requirements of ion chromatography analysis. It can stably deliver liquid, ensure the smooth progress of the separation process, and improve the performance and applicability of the instrument. The ceramic plunger pump has good wear resistance, corrosion resistance and chemical stability. In the process of leather detection, it may come into contact with various chemical reagents. The ceramic plunger pump can effectively resist the corrosion of these chemical substances, extend the service life of the pump, reduce maintenance costs, and at the same time ensure the accuracy and stability of liquid delivery, thereby improving the accuracy and repeatability of ion chromatography detection results.

[0009] Furthermore, a corrosion-resistant separation column is fixedly connected to the bottom of the high-pressure infusion pump. A micro conductivity cell is fixedly installed at the bottom of the corrosion-resistant separation column via a snap-fit ​​sleeve. A temperature sensor is installed at the bottom of the micro conductivity cell. The corrosion-resistant separation column has a PEEK shell. The packing material of the corrosion-resistant separation column is sulfonated divinylbenzene copolymer with a particle size of 5μm. The electrode of the micro conductivity cell is made of platinum-iridium alloy. The corrosion-resistant separation column is marked B1, the micro conductivity cell is marked B2, and the temperature sensor is marked B3.

[0010] The above scheme utilizes a PEEK shell for the corrosion-resistant separation column. PEEK possesses excellent chemical stability, resisting strong acids, strong alkalis, and various organic solvents. In the complex chemical environment of leather testing, it effectively resists chemical corrosion, extends the column's lifespan, and ensures long-term stable operation of the instrument. The column packing material is sulfonated divinylbenzene copolymer with a particle size of 5μm. This suitable particle size helps improve ion exchange efficiency, enabling precise separation of different ionic components in leather samples and ensuring the accuracy and reliability of the test results. The micro conductivity cell electrode uses a platinum-iridium alloy, which has excellent conductivity and chemical stability, greatly enhancing the sensitivity and accuracy of conductivity detection. It accurately captures changes in ion concentration, providing accurate data support for leather testing. A temperature sensor is installed at the bottom of the micro conductivity cell to monitor temperature changes in real time during the testing process. Since solution conductivity is greatly affected by temperature, the data feedback from the temperature sensor allows for temperature compensation of the test results, eliminating temperature interference and ensuring the authenticity and validity of the test data. The corrosion-resistant separation column and the micro conductivity cell are fixedly installed using a snap-fit ​​connector. This connection method is convenient for operation, disassembly, and maintenance.

[0011] Furthermore, a touch screen and a PLC controller are fixedly installed on the side of the ion chromatograph body. The PLC controller communicates with each module via an RS485 bus. The touch screen is labeled C1, and the PLC controller is labeled C2.

[0012] With the above solution, a touch screen is fixedly installed on the side of the ion chromatograph, allowing users to perform various settings and controls on the instrument via touch operation. Compared to traditional button operation, this is more intuitive and convenient, reducing the learning cost and operational difficulty for operators, and improving work efficiency. Equipped with a PLC (Programmable Logic Controller), it can realize automated control and management of various modules of the ion chromatograph. Through pre-written programs, the PLC controller can accurately control the instrument's operating parameters and workflow, ensuring the stability and accuracy of the detection process and reducing human error. The PLC controller communicates with each module via an RS485 bus. The RS485 bus has advantages such as long communication distance, strong anti-interference ability, and fast data transmission rate, which enables the PLC controller to stably and reliably interact with each module and transmit commands, ensuring coordinated operation between various parts of the instrument and improving the stability and reliability of the entire system.

[0013] Furthermore, a sealing cap is snapped onto the top of the automatic dilution unit, and a fixing post is fixedly connected to the top of the sealing cap.

[0014] With the above scheme, the top of the automatic dilution unit adopts a snap-fit ​​sealing cap. The snap-fit ​​design can fit tightly to the top opening of the automatic dilution unit, effectively preventing external dust, impurities and volatile substances from entering the automatic dilution unit. This ensures the purity and accuracy of the sample during the dilution process, avoids interference from external factors on the sample dilution, and thus improves the reliability of the test results. The fixing column can also be used to remove the sealing cap.

[0015] Furthermore, a dust shield is fixedly connected to the side of the ion chromatograph body.

[0016] The above solutions can effectively prevent dust and debris from entering the instrument, reduce the contamination and corrosion of precision components such as circuit boards and sensors by dust, lower the probability of equipment failure caused by dust accumulation, protect the normal operation of the instrument, and extend the service life of the instrument.

[0017] Furthermore, a door is movably connected to the side of the ion chromatograph body via a hinge, and a handle is fixedly connected to the side of the door. Magnetic blocks are provided on both the side of the door and the side of the ion chromatograph body, and there are four magnetic blocks in total.

[0018] The above-described design uses hinges to connect the cabinet door to the side of the ion chromatograph. This connection allows the door to be easily opened and closed, facilitating operation, maintenance, repair, and component replacement within the instrument. The operation is simple and smooth, improving work efficiency. A handle is fixedly connected to the side of the door, providing operators with a convenient point of force application, making opening and closing the door easier and more effortless, enhancing operational comfort and convenience. Four magnetic blocks are installed on the side of the door and the ion chromatograph. The magnetic force of these blocks ensures that the door fits tightly against the instrument body when closed, effectively preventing dust and debris from entering the instrument. This also reduces interference from the external environment, ensuring the stability of the instrument's operating environment and improving the accuracy of detection results.

[0019] Furthermore, the bottom of the ion chromatograph body is fixedly connected with four support legs, and the bottom of each of the four support legs is fixedly connected with a rubber round pad.

[0020] The above design incorporates four support legs at the bottom of the ion chromatograph, forming a stable quadrilateral support structure. This structure evenly distributes the instrument's weight, effectively enhancing its stability during placement and preventing tilting or tipping due to an unstable center of gravity. This ensures smooth operation during detection, guaranteeing accurate results. Each support leg has a fixed rubber pad at its bottom. The rubber material provides excellent elasticity and shock absorption, absorbing and buffering external vibrations during operation. This reduces the impact of vibrations on the instrument's internal precision components, lowering the risk of loosening or damage due to vibration, extending the instrument's lifespan, and improving detection accuracy.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial effects: This ion chromatograph for leather testing features an automatic dilution unit that connects to an online filtration unit via a flange thread. This connection method ensures robustness and reliability of the components during instrument operation. The threaded connection also facilitates disassembly and maintenance, allowing for easy inspection, cleaning, or replacement of internal components. The online filtration unit utilizes a 5μm stainless steel sintered filter element. Stainless steel offers excellent corrosion resistance and mechanical strength, making it suitable for use in environments like leather testing where samples may come into contact with various chemicals. The 5μm precision effectively filters samples, removing larger particles and ensuring sample purity during subsequent testing. This prevents impurities from interfering with test results and improves accuracy. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall front view structure of this application; Figure 2 This is a top view of the online filtering unit in this application. Figure 3 This is a schematic diagram of the overall frontal sectional structure in this application; Figure 4 This is a schematic diagram of the sample introduction module system structure in this application; Figure 5 This is a schematic diagram of the separation and detection module system structure in this application; Figure 6 This is a schematic diagram of the control module system structure in this application.

[0023] In the picture: 1. Automatic dilution unit; 2. Flange; 3. Online filtration unit; 4. High-pressure infusion pump; 5. Touch screen; 6. PLC controller; 7. Sealing cover; 8. Fixing column; 9. Dust shield; 10. Door; 11. Handle; 12. Magnetic block; 13. Support leg; 14. Rubber round pad; 15. Stainless steel sintered filter element; 16. Corrosion-resistant separation column; 17. Snap-fit ​​sleeve; 18. Miniature conductivity cell; 19. Temperature sensor; 20. Ion chromatograph body. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Please see Figure 1 , Figure 2 and Figure 4 This embodiment of an ion chromatograph for leather detection includes an auto-dilution unit 1, a flange 2, an online filtration unit 3, and an ion chromatograph body 20. The bottom of the auto-dilution unit 1 is threadedly connected to the online filtration unit 3 via the flange 2. The online filtration unit 3 contains a sintered stainless steel filter element 15. The auto-dilution unit 1 is labeled A1, and the online filtration unit 3 is labeled A2. The sintered stainless steel filter element 15 is 5μm thick. The auto-dilution unit 1 and the online filtration unit 3 are connected via the flange 2, providing a stable connection that ensures reliable connection between components during instrument operation. The threaded connection also facilitates disassembly and maintenance, allowing for easy inspection, cleaning, or replacement of internal components. The online filtration unit 3 contains a 5μm thick sintered stainless steel filter element 15. Stainless steel has good corrosion resistance and mechanical strength, making it suitable for use in environments like leather detection where exposure to various chemicals is possible. The high precision allows for effective filtration of samples, removing larger particulate impurities, ensuring sample purity during subsequent testing, preventing impurities from interfering with test results, and improving test accuracy.

[0026] Please see Figure 1 , Figure 3 and Figure 5A high-pressure infusion pump 4 is fixedly installed at the bottom of the online filtration unit 3. The ion chromatograph body 20 is fixedly installed on the surface of the high-pressure infusion pump 4. The high-pressure infusion pump 4 is a ceramic plunger pump with a flow rate range of 0.1-2.0 mL / min and a pressure resistance of 40 MPa. The layout of the high-pressure infusion pump 4 at the bottom of the online filtration unit 3 and the ion chromatograph body 20 on its surface makes the instrument structure more compact, saves space, facilitates the overall placement and operation of the instrument, and also reduces the length of the connecting pipelines between the components to a certain extent, reducing loss and interference during sample transfer. The ceramic plunger pump is chosen as the high-pressure infusion pump 4 because it has the following outstanding advantages: a flow rate range of 0.1-2.0 mL / min.With a flow rate of 0 mL / min, this wide flow range can meet the diverse liquid flow rate requirements of different detection projects. The flow rate can be flexibly adjusted according to specific detection requirements to ensure the accuracy and reliability of the detection. The 40 MPa pressure resistance indicates that the pump can withstand high pressure, adapting to the high-pressure environment requirements of ion chromatography analysis. It can stably deliver liquid, ensuring the smooth progress of the separation process, thus improving the performance and applicability of the instrument. The ceramic plunger pump has good wear resistance, corrosion resistance, and chemical stability. In leather detection, it may come into contact with various chemical reagents, and the ceramic plunger pump can effectively resist the corrosive effects of these chemicals. This design extends the pump's lifespan, reduces maintenance costs, and ensures the accuracy and stability of the infusion, thereby improving the accuracy and repeatability of ion chromatograph detection results. A corrosion-resistant separation column 16 is fixedly connected to the bottom of the high-pressure infusion pump 4. A micro conductivity cell 18 is fixedly installed at the bottom of the corrosion-resistant separation column 16 via a snap-fit ​​sleeve 17. A temperature sensor 19 is located at the bottom of the micro conductivity cell 18. The corrosion-resistant separation column 16 has a PEEK shell, and its packing material is sulfonated divinylbenzene copolymer with a particle size of 5μm. The electrode of the micro conductivity cell 18 is made of platinum-iridium alloy. The corrosion-resistant separation column 16 is marked with "B". 1. The micro conductivity cell 18 is marked B2, the temperature sensor 19 is marked B3, and the corrosion-resistant separation column 16 uses a PEEK shell. PEEK has excellent chemical stability, resisting strong acids, strong alkalis, and various organic solvents. In the complex chemical environment of leather testing, it can effectively resist chemical corrosion, extend the service life of the separation column, and ensure long-term stable operation of the instrument. The packing material of the corrosion-resistant separation column 16 is sulfonated divinylbenzene copolymer with a particle size of 5μm. The appropriate particle size helps to improve ion exchange efficiency, achieve precise separation of different ionic components in leather test samples, and ensure the accuracy and reliability of the test results. The micro conductivity cell 18 electrode... A platinum-iridium alloy is used, which possesses excellent electrical conductivity and chemical stability, greatly improving the sensitivity and accuracy of conductivity detection. This allows for precise capture of ion concentration changes, providing accurate data support for leather testing. A temperature sensor 19 is installed at the bottom of the miniature conductivity cell 18 to monitor temperature changes in real time during the detection process. Since the conductivity of the solution is significantly affected by temperature, the data feedback from the temperature sensor 19 enables temperature compensation of the detection results, eliminating temperature interference and ensuring the authenticity and validity of the detection data. The corrosion-resistant separation column 16 is fixedly installed to the miniature conductivity cell 18 via a snap-fit ​​connector 17. This connection method is convenient for operation, disassembly, and maintenance.

[0027] Please see Figure 1 and Figure 6A touchscreen 5 and a PLC controller 6 are fixedly mounted on the side of the ion chromatograph body 20. The PLC controller 6 communicates with each module via an RS485 bus. The touchscreen 5 is labeled C1, and the PLC controller 6 is labeled C2. The touchscreen 5 allows users to perform various settings and controls on the instrument via touch operation, which is more intuitive and convenient than traditional button operation, reducing the learning cost and operational difficulty for operators and improving work efficiency. Equipped with a PLC (Programmable Logic Controller), it can achieve automated control and management of each module of the ion chromatograph. Through pre-written programs, the PLC controller 6 can accurately control the instrument's operating parameters and workflow, ensuring the stability and accuracy of the detection process and reducing human error. The PLC controller communicates with each module via an RS485 bus. The bus has advantages such as long communication distance, strong anti-interference ability, and fast data transmission rate. This enables the PLC controller 6 to stably and reliably interact with various modules and transmit instructions, ensuring coordinated operation between different parts of the instrument and improving the stability and reliability of the entire system. The top of the automatic dilution unit 1 is snapped with a sealing cover 7, and the top of the sealing cover 7 is fixedly connected with a fixing post 8. The automatic dilution unit 1 adopts a snap-fit ​​sealing cover 7 design, which can fit tightly against the top opening of the automatic dilution unit 1, effectively preventing external dust, impurities, and volatile substances from entering the automatic dilution unit 1. This ensures the purity and accuracy of the sample during the dilution process, avoids interference from external factors on the sample dilution, and thus improves the reliability of the test results. The fixing post 8 can be used to remove the sealing cover 7.

[0028] Please see Figure 1A dust shield 9 is fixedly connected to the side of the ion chromatograph body 20, which can effectively prevent dust and debris from entering the instrument, reduce dust contamination and corrosion of internal precision components such as circuit boards and sensors, reduce the probability of equipment failure caused by dust accumulation, protect the normal operation of the instrument, and extend the service life of the instrument. A door 10 is movably connected to the side of the ion chromatograph body 20 via a hinge. A handle 11 is fixedly connected to the side of the door 10. Magnetic blocks 12 are provided on the side of both the door 10 and the side of the ion chromatograph body 20. There are four magnetic blocks 12. The hinges movably connect the cabinet door 10 to the side of the ion chromatograph body 20. This connection method allows the cabinet door 10 to be easily opened and closed, facilitating operation, maintenance, repair, and component replacement by the operator. The operation process is simple and smooth, improving work efficiency. A handle 11 is fixedly connected to the side of the cabinet door 10, providing the operator with a convenient point of force application, making opening and closing the cabinet door 10 easier and less strenuous, enhancing operational comfort and convenience. Four magnetic blocks 12 are provided on the side of the cabinet door 10 and the ion chromatograph body 20. The magnetic force of the magnetic block 12 ensures that the door 10 fits tightly against the instrument body after closing, effectively preventing dust and debris from entering the instrument. It also reduces external environmental interference, ensuring the stability of the instrument's operating environment and improving the accuracy of detection results. Four support legs 13 are fixedly connected to the bottom of the ion chromatograph body 20. Each of the four support legs 13 has a rubber round pad 14 fixedly connected to its bottom end. These four support legs 13 form a stable quadrilateral support structure at the bottom of the ion chromatograph body 20, which can evenly distribute the weight of the instrument. The weight distribution effectively enhances the stability of the instrument when it is placed, preventing it from tilting or tipping over due to an unstable center of gravity. This ensures that the instrument operates smoothly during the testing process, thereby guaranteeing the accuracy of the test results. Each support leg 13 has a rubber round pad 14 fixedly connected to its bottom end. The rubber material has good elasticity and shock absorption properties. During the operation of the instrument, the rubber round pad 14 can absorb and buffer the vibrations transmitted from the outside, reducing the impact of vibration on the precision components inside the instrument, reducing the risk of loosening or damage to components caused by vibration, extending the service life of the instrument, and also helping to improve the accuracy of the test.

[0029] In this embodiment, an ion chromatograph for leather detection is described. It should be noted that by setting up an automatic dilution unit 1, the automatic dilution unit 1 and the online filtration unit 3 can be connected via a flange 2 threaded connection. This connection method is relatively stable, ensuring the reliability of the connection between various components during instrument operation. Simultaneously, the threaded connection facilitates disassembly and maintenance, making it convenient to inspect, clean, or replace internal components. The online filtration unit 3 contains a 5μm stainless steel sintered filter element 15. Stainless steel has good corrosion resistance and mechanical strength, making it suitable for use in environments such as leather detection where it may come into contact with various chemicals. The 5μm precision can effectively filter the sample, removing larger particulate impurities, ensuring the purity of the sample during subsequent detection, avoiding interference from impurities with the detection results, and improving the accuracy of the detection.

[0030] The working principle of the above embodiment is as follows: First, in the leather testing process, the leather sample is prepared into a test solution and placed in the automatic dilution unit 1 (marked A1). The automatic dilution unit 1 accurately dilutes the leather sample solution according to a preset program to ensure that the sample concentration meets the testing requirements, laying the foundation for subsequent testing procedures. Then, the diluted sample solution flows into the online filtration unit 3 (marked A2) through the threaded connection channel of the flange 2 at the bottom of the automatic dilution unit 1. The 5μm stainless steel sintered filter element 15 inside the online filtration unit 3 plays a key role in efficiently filtering out particulate matter and other impurities in the solution, avoiding interference from these impurities in subsequent testing steps, and ensuring the accuracy of the test results. After that, the filtered solution enters the high-pressure infusion pump 4 fixedly installed at the bottom of the online filtration unit 3. This pump is a ceramic plunger pump with a flow range of 0.1-2.0 mL / min and a pressure resistance of 40 MPa. The high-pressure infusion pump 4 delivers the sample solution to the corrosion-resistant separation column 16 (marked B1) fixedly connected to the bottom of the high-pressure infusion pump 4 with stable and controllable pressure and flow. The corrosion-resistant separation column 16 is made of PEEK. The outer shell is made of a material with excellent chemical stability. Its interior is filled with sulfonated divinylbenzene copolymer with a particle size of 5 μm. When the sample solution flows through the corrosion-resistant separation column 16, the different ions in the solution have different affinities for the column packing material. Based on this, different ions move at different speeds within the separation column, thus achieving the separation of each ionic component. Afterward, the separated ions sequentially enter a micro conductivity cell 18 (marked B2) fixed to the bottom of the corrosion-resistant separation column 16 via a snap-fit ​​sleeve 17. The electrodes of the micro conductivity cell 18 are made of platinum-iridium alloy, which has good conductivity. Due to its chemical stability, the ions entering the micro conductivity cell 18 cause a change in the solution's conductivity. The micro conductivity cell 18 converts this conductivity change into an electrical signal. Simultaneously, a temperature sensor 19 (labeled B3) at the bottom of the micro conductivity cell 18 monitors the solution temperature in real time, used for temperature compensation of the detection results, eliminating the influence of temperature factors on conductivity detection. Finally, the electrical signal output by the micro conductivity cell 18 is amplified and transmitted to the PLC controller 6 (labeled C2) fixedly mounted on the side of the ion chromatograph body 20. The PLC controller 6 communicates with each module via an RS485 bus, analyzes and calculates the electrical signal according to a pre-set algorithm and standard curve, and thus accurately determines the concentration of each ion in the leather sample. The operator can intuitively view the detection results, set instrument parameters, and monitor the detection process through the touch screen 5 (labeled C1) fixedly mounted on the side of the ion chromatograph body 20.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ion chromatograph for leather detection, comprising an automatic dilution unit (1), a flange (2), an online filtration unit (3) and an ion chromatograph body (20), characterized in that: The bottom of the automatic dilution unit (1) is connected to an online filtration unit (3) via a flange (2) threaded connection. The online filtration unit (3) is equipped with a stainless steel sintered filter element (15). The automatic dilution unit (1) is marked as A1, the online filtration unit (3) is marked as A2, and the stainless steel sintered filter element (15) is 5μm.

2. The ion chromatograph for leather detection according to claim 1, characterized in that: A high-pressure infusion pump (4) is fixedly installed at the bottom of the online filtration unit (3). An ion chromatograph body (20) is fixedly installed on the surface of the high-pressure infusion pump (4). The high-pressure infusion pump (4) is a ceramic plunger pump with a flow rate range of 0.1-2.0 mL / min and a pressure resistance of 40 MPa.

3. An ion chromatograph for leather detection according to claim 2, characterized in that: The bottom end of the high-pressure infusion pump (4) is fixedly connected to a corrosion-resistant separation column (16). The bottom end of the corrosion-resistant separation column (16) is fixedly installed with a micro conductivity cell (18) through a snap-fit ​​sleeve (17). A temperature sensor (19) is set at the bottom of the micro conductivity cell (18). The corrosion-resistant separation column (16) is made of PEEK material. The filler of the corrosion-resistant separation column (16) is sulfonated divinylbenzene copolymer with a particle size of 5μm. The electrode of the micro conductivity cell (18) is made of platinum-iridium alloy. The corrosion-resistant separation column (16) is marked as B1, the micro conductivity cell (18) is marked as B2, and the temperature sensor (19) is marked as B3.

4. An ion chromatograph for leather detection according to claim 1, characterized in that: A touch screen (5) and a PLC controller (6) are fixedly installed on the side of the ion chromatograph body (20). The PLC controller (6) communicates with each module through an RS485 bus. The touch screen (5) is labeled C1 and the PLC controller (6) is labeled C2.

5. An ion chromatograph for leather detection according to claim 1, characterized in that: The top of the automatic dilution unit (1) is fitted with a sealing cap (7), and the top of the sealing cap (7) is fixedly connected with a fixing post (8).

6. An ion chromatograph for leather detection according to claim 1, characterized in that: A dust cover plate (9) is fixedly connected to the side of the ion chromatograph body (20).

7. An ion chromatograph for leather detection according to claim 1, characterized in that: The side of the ion chromatograph body (20) is connected to a door (10) via a hinge. A handle (11) is fixedly connected to the side of the door (10). Magnetic blocks (12) are provided on both the side of the door (10) and the side of the ion chromatograph body (20). There are four magnetic blocks (12).

8. An ion chromatograph for leather detection according to claim 1, characterized in that: The bottom of the ion chromatograph body (20) is fixedly connected to a support leg (13), and there are four support legs (13). The bottom ends of the four support legs (13) are all fixedly connected to a rubber round pad (14).

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