A pollution-proof electrolyte sampling cylinder for laboratory use

Abstract

The application discloses a pollution-preventing electrolyte sampling cylinder for laboratories and relates to the technical field of general laboratory equipment. The application comprises a cylinder body, a partition plate installed in the interior of the cylinder body, exhaust pipes installed at the front and rear of the cylinder body respectively, and a sealing mechanism arranged above the cylinder body. The sealing mechanism comprises a sealing cover threadedly connected to the top surface of the cylinder body, flow guide holes respectively formed in the front and rear sides of the top of the sealing cover, and a fixing rod arranged on one side of the flow guide holes. The application sets sealing mechanisms such as a sealing cover, flow guide holes, an elastic reset sealing disc and a liquid inlet pipe on the top of the sampling cylinder to form a new type of cylinder. The cylinder always maintains a closed state during sampling, reversing and liquid discharging in the laboratory, effectively prevents external air from entering the interior of the cylinder body, significantly reduces the risk of moisture absorption or oxidation of the electrolyte during sampling due to contact with air, and thus guarantees the purity of the sample and the accuracy of subsequent liquid preparation experiments.

Description

Technical Field

[0001] This invention belongs to the technical field of general laboratory equipment, and in particular relates to a laboratory-use anti-contamination electrolyte sampling graduated cylinder. Background Technology

[0002] Electrolytes are core functional materials in fields such as lithium-ion batteries, supercapacitors, and electroplating. In electrochemical, new energy battery, and physicochemical analysis laboratories, it is often necessary to sample electrolytes to prepare standard solutions. Graduated cylinders are often used as the most common electrolyte sampling vessels in laboratories.

[0003] Currently, most liquid sampling graduated cylinders commonly used in laboratories are open-top designs, with the top of the cylinder exposed. When sampling, the liquid must be poured directly into the graduated cylinder. This method has obvious drawbacks: for liquid substances that are sensitive to air, such as lithium-ion battery electrolytes, moisture and oxygen in the air can easily mix into the sample during the sampling process, causing the sample to absorb moisture or undergo oxidation and deterioration, affecting the purity of the sample, and thus affecting the liquid preparation experiment.

[0004] To address this issue, we provide a laboratory-grade, pollution-resistant electrolyte sampling graduated cylinder. Summary of the Invention

[0005] The purpose of this invention is to provide a laboratory-use anti-contamination electrolyte sampling graduated cylinder. By setting a sealing mechanism, it solves the problem that samples are easily contaminated during use due to the open design of existing laboratory-use electrolyte sampling graduated cylinders.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution.

[0007] This invention relates to a laboratory-use anti-contamination electrolyte sampling graduated cylinder, comprising a cylinder body, a partition installed inside the cylinder body, exhaust pipes installed at the front and rear of the cylinder body respectively, and a sealing mechanism provided above the cylinder body; the sealing mechanism includes a sealing cap threaded to the top surface of the cylinder body, guide holes respectively opened on the front and rear sides of the top of the sealing cap, a fixing rod provided on one side of the guide holes, a fixing plate installed on the top of the fixing rod, a sealing plate rotatably connected to the bottom surface of the fixing plate, and a torsion spring installed between the sealing plate and the fixing plate and located on the surface of the fixing rod.

[0008] The present invention is further configured such that the sealing mechanism includes an inlet pipe disposed on the top of the sealing cover, a sealing ring installed on the top surface of the inlet pipe, a fixing cylinder installed on the bottom surface of the inlet pipe, a first spring installed on the top of the fixing cylinder, a compression ring installed on the bottom of the first spring, a connecting component disposed on the surface of the sealing ring, and a limiting component disposed on the top of the sealing ring.

[0009] The present invention is further configured such that the top end of the extrusion ring is located inside the fixed cylinder and in close contact with the fixed cylinder.

[0010] The present invention is further configured such that the connecting assembly includes a movable ring rotatably connected to the surface of the sealing ring, a limiting ring threadedly connected to the surface of the movable ring, limiting grooves respectively opened on the top sides of the movable ring and the limiting ring, a connecting frame inserted into the limiting groove, a support frame installed between the two connecting frames, and an adjusting knob threadedly connected to the bottom of the support frame.

[0011] The present invention is further configured such that the size of the limiting groove is adapted to the size of the top of the connecting frame, and the top of the adjusting knob extends to the top of the support frame.

[0012] The present invention is further configured such that the limiting component includes a housing installed on the top of the sealing ring, a movable plate disposed inside the housing, an insert rod installed on the bottom of the movable plate and extending through to the bottom of the housing, an insert hole disposed below the insert rod, a pull rod rotatably connected to the top of the movable plate and extending through to the top of the housing, a pull plate installed on the top of the pull rod, a second spring installed between the movable plate and the top of the housing and located on the surface of the pull rod, a vertical plate installed on the top of the housing, and a slot formed on the top of the vertical plate.

[0013] The invention is further configured such that the movable plate is in close contact with the housing, the plug rod is inserted into the plug hole, and the size of the plug hole is adapted to the plug rod.

[0014] The present invention is further configured such that the bottom of the fixing rod is fixedly connected to the sealing cover, the sealing disc is located directly above the guide hole, and the cross-sectional area of ​​the sealing disc is larger than the cross-sectional area of ​​the guide hole.

[0015] The present invention is further configured such that a three-way valve is provided above the sealing cover, a conduit is connected to one side of the three-way valve, and a drain pipe is connected to the top of the three-way valve.

[0016] The present invention is further configured such that a support plate is installed in front of the conduit, and an installation hole is provided in front of the support plate.

[0017] The beneficial effects of this invention are as follows: By setting a sealing cap, a guide hole, an elastic reset sealing disc, and an inlet pipe on the top of the sampling graduated cylinder, a novel graduated cylinder is formed. This ensures that the graduated cylinder remains sealed throughout the laboratory sampling, reversing, and draining processes, effectively preventing external air from entering the cylinder. This significantly reduces the risk of the electrolyte absorbing moisture or oxidizing and deteriorating due to contact with air during sampling, thereby ensuring sample purity and the accuracy of subsequent solution preparation experiments. Simultaneously, the cooperation between the connecting and limiting components enables rapid alignment and sealing of the inlet pipe and the guide hole, while also ensuring the stability of the cylinder during rotation and positioning. The design ensures the safety of the sample, preventing leakage due to misalignment or loosening. Furthermore, the integrated design of the three-way valve, conduit, and drain pipe allows for pre-draining of residual liquid and air from the pipeline before sampling, reducing cross-contamination and facilitating quick docking with external storage containers in the laboratory, thus improving operational convenience and experimental efficiency. In addition, the internal partition separates the sampling chamber from the collection chamber, and the exhaust pipe recovers the replacement gas, balancing sample pretreatment with environmental protection requirements. While maintaining the basic functions of the graduated cylinder, this system systematically improves the sealing, anti-contamination capability, and operational reliability of electrolyte sampling, making it suitable for laboratory sampling scenarios involving air-sensitive liquids. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0019] Figure 1 This is a three-dimensional diagram of a laboratory-use anti-contamination electrolyte sampling graduated cylinder.

[0020] Figure 2 This diagram shows the connection status of the inlet pipe and the three-way valve in a laboratory-use anti-contamination electrolyte sampling graduated cylinder.

[0021] Figure 3 This is a rear view of the support plate in a laboratory-use anti-contamination electrolyte sampling graduated cylinder.

[0022] Figure 4 This is a cross-sectional view of the inlet end of the tubing in a laboratory-use anti-contamination electrolyte sampling graduated cylinder.

[0023] Figure 5 This is a cross-sectional view of the sealing ring in a laboratory-use anti-contamination electrolyte sampling graduated cylinder.

[0024] Figure 6 This is a cross-sectional view of the cylinder of a laboratory-use anti-contamination electrolyte sampling graduated cylinder.

[0025] Figure 7 This is a cross-sectional view of the fixed cylinder in a laboratory-use anti-contamination electrolyte sampling graduated cylinder.

[0026] Figure 8This is a diagram showing the state of the flow guide hole being open in a laboratory-grade anti-contamination electrolyte sampling graduated cylinder.

[0027] Figure 9 This is a top view of the sealing ring in a laboratory-grade anti-contamination electrolyte sampling graduated cylinder.

[0028] Figure 10 This is a cross-sectional view of a limiting ring in a laboratory-use anti-contamination electrolyte sampling graduated cylinder.

[0029] Figure 11 This is a diagram showing the disassembled state of the connecting frame in a laboratory-use anti-contamination electrolyte sampling graduated cylinder.

[0030] Figure 12 This is a cross-sectional view of the housing in a laboratory-use anti-contamination electrolyte sampling graduated cylinder.

[0031] Figure 13 A laboratory-grade anti-contamination electrolyte sampling graduated cylinder Figure 6 A magnified view of A in the middle.

[0032] Figure 14 A laboratory-grade anti-contamination electrolyte sampling graduated cylinder Figure 7 A magnified view of B in the middle.

[0033] In the attached diagram: 1. Cylinder body; 2. Baffle plate; 3. Exhaust pipe; 4. Sealing mechanism; 41. Sealing cover; 42. Guide hole; 43. Fixing rod; 44. Fixing plate; 45. Sealing plate; 46. Torsion spring; 47. Liquid inlet pipe; 48. Sealing ring; 49. Fixing cylinder; 410. First spring; 411. Compression ring; 412. Connecting assembly; 4121. Movable ring; 4122. Limiting ring; 4123. Limiting groove ; 4124, Connecting frame; 4125, Support frame; 4126, Adjusting knob; 413, Limiting assembly; 4131, Housing; 4132, Movable plate; 4133, Insert rod; 4134, Insertion hole; 4135, Pull rod; 4136, Pull plate; 4137, Second spring; 4138, Vertical plate; 4139, Slot; 5, Three-way valve; 6, Conduit; 7, Drain pipe; 8, Support plate; 9, Mounting hole. Detailed Implementation

[0034] The technical solutions of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] Example 1: Please refer to Figures 1-14This invention relates to a laboratory-use anti-contamination electrolyte sampling graduated cylinder, comprising a cylinder body 1, a partition 2 installed inside the cylinder body 1, exhaust pipes 3 installed at the front and rear of the cylinder body 1 respectively, and a sealing mechanism 4 provided above the cylinder body 1; the sealing mechanism 4 includes a sealing cap 41 threaded to the top surface of the cylinder body 1, guide holes 42 respectively opened on the front and rear sides of the top of the sealing cap 41, a fixing rod 43 provided on one side of the guide hole 42, a fixing plate 44 installed on the top of the fixing rod 43, a sealing plate 45 rotatably connected to the bottom surface of the fixing plate 44, and a torsion spring 46 installed between the sealing plate 45 and the fixing plate 44 and located on the surface of the fixing rod 43; the sealing mechanism 4 also includes The device includes an inlet pipe 47 disposed on the top of the sealing cover 41, a sealing ring 48 installed on the top surface of the inlet pipe 47, a fixing cylinder 49 installed on the bottom surface of the inlet pipe 47, a first spring 410 installed on the top of the inside of the fixing cylinder 49, a compression ring 411 installed on the bottom of the first spring 410, a connecting component 412 disposed on the surface of the sealing ring 48, and a limiting component 413 disposed on the top of the sealing ring 48. The top of the compression ring 411 is located inside the fixing cylinder 49 and is in close contact with the fixing cylinder 49. The bottom of the fixing rod 43 is fixedly connected to the sealing cover 41. The sealing plate 45 is located directly above the guide hole 42, and the cross-sectional area of ​​the sealing plate 45 is larger than the cross-sectional area of ​​the guide hole 42.

[0036] Cylinder 1 is a sampling graduated cylinder, a standard and commonly used sampling vessel in laboratories. Its interior is divided into two chambers by a partition 2, with graduations on the front. The chamber with graduations is the sampling chamber, and the chamber without graduations is the collection chamber. The graduations are only visible on the front. Figure 1 As shown in the figure (not shown in the following), the cylinder 1 is made of a transparent material. Before sampling, inert gas can be filled into the two chambers of the cylinder 1 to replace the air inside. A one-way valve is fitted on the surface of the exhaust pipe 3. The sealing disc 45 is rotatably connected to the fixed rod 43 through a bearing. The sealing ring 48 is in close contact with the cylinder 1. Slider blocks are installed on both sides of the squeezing ring 411 and in front and behind the movable plate 4132. Sliding grooves that match the sliders are opened on both sides of the inside of the fixed cylinder 49 and the front and rear sides of the inside of the box 4131. The bottom of the squeezing ring 411 and the liquid inlet pipe 47 are in close contact with the sealing cover 41.

[0037] The sealing cap 41 completely seals the opening of the cylinder 1, preventing air from entering during sampling. The guide holes 42 correspond to the sampling chamber and collection chamber of the cylinder 1, respectively, serving as liquid inlet and outlet channels. The fixing rod 43 and the fixing plate 44 provide rotational support for the sealing plate 45, ensuring its stable rotation. Under normal conditions, the sealing plate 45 relies on the torsion spring 46 to block the guide holes 42, preventing gas or liquid leakage. When squeezed, the guide holes 42 can be rotated open, and the torsion spring 46 provides elastic restoring force, ensuring that the sealing plate 45 automatically closes the guide holes 42 when there is no external force, maintaining a sealed state. The liquid inlet pipe 47 serves as the channel for the sample to enter the cylinder 1, connecting with the top of the sealing cap 41 to guide the electrolyte into the guide holes 42. The sealing ring 48 enhances the sealing performance with external connectors. The fixed cylinder 49 houses the first spring 410 and the compression ring 411. The first spring 410 applies a downward elastic force to the compression ring 411, ensuring that the compression ring 411 always keeps in close contact with the sealing cap 41, guaranteeing no leakage at the interface.

[0038] During operation, the sealing cover 41 and the top sealing plate 45 are designed to seal the opening of the cylinder 1, making the top of the cylinder 1 a sealed design.

[0039] When using cylinder 1, rotate cylinder 1 to rotate the guide hole 42 above the collection chamber to the squeezing ring 411. The squeezing ring 411 squeezes the sealing plate 45 to open the guide hole 42 at the top of the collection chamber, and quickly aligns the liquid inlet pipe 47 with the guide hole 42. The entire process is in a sealed state. The electrolyte sample can flow into the collection chamber through the liquid inlet pipe 47 and the guide hole 42 to remove the accumulated liquid and air inside the liquid inlet pipe 47. Then, rotate the guide hole 42 of the sampling chamber to the liquid inlet pipe 47 to perform the sampling operation. During both collection and sampling, as the electrolyte enters, the one-way valve at the exhaust pipe 3 can be opened, and the existing mature collector in the laboratory can be connected to it to collect and recycle the inert gas.

[0040] Example 2: Please refer to Figures 1-11 Based on Embodiment 1, the connecting assembly 412 includes a movable ring 4121 rotatably connected to the surface of the sealing ring 48, a limiting ring 4122 threadedly connected to the surface of the movable ring 4121, limiting grooves 4123 respectively opened on the top sides of the movable ring 4121 and the limiting ring 4122, a connecting frame 4124 inserted into the limiting groove 4123, a support frame 4125 installed between the two connecting frames 4124, and an adjusting knob 4126 threadedly connected to the bottom of the support frame 4125. The size of the limiting groove 4123 is adapted to the top size of the connecting frame 4124, and the top of the adjusting knob 4126 extends to the top of the support frame 4125.

[0041] The movable ring 4121 is rotatably connected to the sealing ring 48 via a bearing. The movable ring 4121 and the limiting groove 4123 on the limiting ring 4122 are connected. The top of the adjusting knob 4126 is rotatably connected to the cylinder 1 via a bearing. Movable blocks are installed on both sides of the cylinder 1. The inner side of the support frame 4125 is provided with a movable groove that matches the movable blocks.

[0042] During operation, align the limiting grooves 4123 of the movable ring 4121 and the limiting ring 4122. Then, insert the connecting frame 4124 into the limiting groove 4123 and rotate the limiting ring 4122 to misalign the limiting grooves 4123 on the limiting ring 4122 and the movable ring 4121. This allows the cylinder 1 on the support frame 4125 to be installed and fixed, establishing a connection with the sealing ring 48 to form a complete measuring cylinder. When the connecting frame 4124 is inserted into the limiting groove 4123 and cannot be moved upwards, the top of the sealing cover 41 is in close contact with the squeezing ring 411 and the liquid inlet pipe 47.

[0043] When using the guide hole 42 of the cylinder 1, rotating the adjustment knob 4126 can move the cylinder 1 as a whole upward, so that the liquid inlet pipe 47 is inserted into the guide hole 42, ensuring the sealing of the sample throughout the process of entering the guide hole 42 from the liquid inlet pipe 47.

[0044] Example 3: Please refer to Figures 9-12 Based on Embodiments 1 and 2, the limiting assembly 413 includes a housing 4131 mounted on the top of the sealing ring 48, a movable plate 4132 disposed inside the housing 4131, an insert rod 4133 mounted on the bottom of the movable plate 4132 with its bottom end extending to the bottom of the housing 4131, an insert hole 4134 disposed below the insert rod 4133, a pull rod 4135 rotatably connected to the top of the movable plate 4132 with its top end extending to the top of the housing 4131, and mounted on... The top of the pull rod 4135 has a pull plate 4136, a second spring 4137 is installed between the movable plate 4132 and the top of the box 4131 and located on the surface of the pull rod 4135, a vertical plate 4138 is installed on the top of the box 4131, a slot 4139 is opened on the top of the vertical plate 4138, the movable plate 4132 and the box 4131 are in close contact, the plug rod 4133 is inserted into the socket 4134, and the size of the socket 4134 is adapted to the plug rod 4133.

[0045] The insertion hole 4134 is located at the top of the movable ring 4121, and the pull rod 4135 is rotatably connected to the movable plate 4132 through a bearing.

[0046] When the connecting bracket 4124 is inserted into the limiting groove 4123 for installation, the insert rod 4133 is inserted into the insertion hole 4134 to fix the movable ring 4121, ensuring the smooth and stable rotation of the limiting ring 4122.

[0047] When it is necessary to rotate the cylinder 1, the pull rod 4135 is pulled by the pull plate 4136, and the insertion rod 4133 is moved out of the insertion hole 4134 by the movable plate 4132. When the insertion rod 4133 is moved out of the insertion hole 4134, the pull plate 4136 is rotated to make it lock into the slot 4139, which can fix the removed insertion rod 4133, making it convenient for the user to rotate the cylinder 1. When the guide hole 42 at the top of the cylinder 1 is aligned with the liquid inlet pipe 47 and inserted, the insertion rod 4133 is reset and inserted into the corresponding insertion hole 4134, thereby ensuring the stability of the cylinder 1 when sampling.

[0048] Example 4: Please refer to Figures 2-4 Based on Examples 1 to 3, a three-way valve 5 is provided above the sealing cover 41, a conduit 6 is connected to one side of the three-way valve 5, a drain pipe 7 is connected to the top of the three-way valve 5, a support plate 8 is installed in front of the conduit 6, and an installation hole 9 is opened in front of the support plate 8.

[0049] The drain pipe 7 is installed behind the support plate 8. A bearing plate is installed on one side of the support plate 8. One-way valves are fitted on the surfaces of both the conduit 6 and the drain pipe 7 away from the three-way valve 5. A moving ring is slidably connected to the surface of the inlet end of the conduit 6. A connecting pipe is rotatably connected to the surface of the moving ring through a bearing. A sealing ring is installed on the end of the conduit 6 away from the three-way valve 5. Moving blocks are installed at the top and bottom of the moving ring. Moving grooves that match the moving blocks are opened at the top and bottom of the conduit 6. The inlet pipe 47 and the three-way valve 5 can be quickly connected using an existing and mature quick-connect structure. Since this connection structure and technology are conventional and mature technologies in the laboratory, they are not shown in the figure and will not be described in detail here.

[0050] The movable ring, connecting pipe, and sealing ring enable the conduit 6 to be installed and connected to the storage dish to be sampled in the laboratory, and it is fixed to the existing support in the laboratory by the support plate 8. When using the cylinder 1, the inlet pipe 47 can be quickly connected to the three-way valve 5 for sampling, which increases the convenience of operation. Before sampling, the sample liquid is discharged through the conduit 6 and the drain pipe 7, which can remove the air and accumulated liquid inside the pipe and avoid contamination of the sampling. Laboratory instruments such as graduated cylinders can be placed on the support plate to collect the discharged liquid.

[0051] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A laboratory-grade anti-contamination electrolyte sampling graduated cylinder, comprising a cylinder body (1), a partition (2) installed inside the cylinder body (1), and exhaust pipes (3) respectively installed at the front and rear of the cylinder body (1), characterized in that: A sealing mechanism (4) is provided above the cylinder (1); The sealing mechanism (4) includes a sealing cap (41) threaded to the top surface of the cylinder (1), a guide hole (42) opened on the front and rear sides of the top of the sealing cap (41), a fixing rod (43) set on one side of the guide hole (42), a fixing plate (44) installed on the top of the fixing rod (43), a sealing plate (45) rotatably connected to the bottom surface of the fixing plate (44), and a torsion spring (46) installed between the sealing plate (45) and the fixing plate (44) and located on the surface of the fixing rod (43).

2. The laboratory-use anti-contamination electrolyte sampling graduated cylinder according to claim 1, characterized in that: The sealing mechanism (4) further includes an inlet pipe (47) disposed on the top of the sealing cover (41), a sealing ring (48) installed on the top surface of the inlet pipe (47), a fixing cylinder (49) installed on the bottom surface of the inlet pipe (47), a first spring (410) installed on the top of the fixing cylinder (49), a compression ring (411) installed on the bottom of the first spring (410), a connecting component (412) disposed on the surface of the sealing ring (48), and a limiting component (413) disposed on the top of the sealing ring (48).

3. A laboratory-grade anti-contamination electrolyte sampling graduated cylinder according to claim 2, characterized in that: The top of the compression ring (411) is located inside the fixed cylinder (49) and is in close contact with the fixed cylinder (49).

4. A laboratory-grade anti-contamination electrolyte sampling graduated cylinder according to claim 2, characterized in that: The connecting assembly (412) includes a movable ring (4121) rotatably connected to the surface of the sealing ring (48), a limiting ring (4122) threadedly connected to the surface of the movable ring (4121), limiting grooves (4123) respectively opened on the top sides of the movable ring (4121) and the limiting ring (4122), a connecting frame (4124) inserted into the limiting groove (4123), a support frame (4125) installed between the two connecting frames (4124), and an adjusting knob (4126) threadedly connected to the bottom of the support frame (4125).

5. A laboratory-grade anti-contamination electrolyte sampling graduated cylinder according to claim 4, characterized in that: The size of the limiting groove (4123) is adapted to the top size of the connecting frame (4124), and the top of the adjusting knob (4126) extends above the support frame (4125).

6. A laboratory-grade anti-contamination electrolyte sampling graduated cylinder according to claim 2, characterized in that: The limiting component (413) includes a housing (4131) installed on top of the sealing ring (48), a movable plate (4132) disposed inside the housing (4131), a plug rod (4133) installed on the bottom of the movable plate (4132) and extending to the bottom of the housing (4131), a plug hole (4134) disposed below the plug rod (4133), a pull rod (4135) rotatably connected to the top of the movable plate (4132) and extending to the top of the housing (4131), a pull plate (4136) installed on the top of the pull rod (4135), a second spring (4137) installed between the movable plate (4132) and the top of the housing (4131) and located on the surface of the pull rod (4135), a vertical plate (4138) installed on the top of the housing (4131), and a slot (4139) opened on the top of the vertical plate (4138).

7. A laboratory-grade anti-contamination electrolyte sampling graduated cylinder according to claim 6, characterized in that: The movable plate (4132) is in close contact with the box (4131), the plug rod (4133) is inserted into the socket (4134), and the size of the socket (4134) is adapted to the plug rod (4133).

8. A laboratory-grade anti-contamination electrolyte sampling graduated cylinder according to claim 1, characterized in that: The bottom of the fixing rod (43) is fixedly connected to the sealing cover (41), the sealing plate (45) is located directly above the guide hole (42), and the cross-sectional area of ​​the sealing plate (45) is larger than the cross-sectional area of ​​the guide hole (42).

9. A laboratory-grade anti-contamination electrolyte sampling graduated cylinder according to claim 1, characterized in that: A three-way valve (5) is provided above the sealing cap (41), a conduit (6) is connected to one side of the three-way valve (5), and a drain pipe (7) is connected to the top of the three-way valve (5).

10. A laboratory-grade anti-contamination electrolyte sampling graduated cylinder according to claim 9, characterized in that: A support plate (8) is installed in front of the conduit (6), and an installation hole (9) is provided in front of the support plate (8).

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