Sampling device for analytical chemistry

Abstract

The utility model provides a sampling device for analytical chemistry, and belongs to the technical field of liquid extraction. The sampling device mainly comprises a sampling barrel, a sampling head and a fixing structure, the lower end of the sampling barrel is vertically provided with a connecting pipe, the connecting pipe is communicated with the sampling barrel, and the connecting pipe is detachably connected with a sampling head; a piston rod is connected in the sampling barrel, a piston is mounted at one end of the piston rod, the piston is connected in the sampling barrel in a sliding manner, a piston handle is mounted at the other end of the piston rod, and the piston handle extends out of a barrel opening of the sampling barrel; a handle is arranged on the outer side of a barrel opening of the sampling barrel, a fixing structure is detachably mounted on the barrel opening of the sampling barrel, a glass plug is mounted on a sampling head at the lower end of the sampling barrel, and the sampling head at the lower end of the sampling barrel is movably inserted into the base. According to the utility model, the sampled liquid is not easy to drop, and the sampling volume is convenient to control.

Description

Technical Field

[0001] This utility model relates to the field of liquid extraction technology, and in particular to a sampling device for analytical chemistry. Background Technology

[0002] Analytical chemistry is a science that studies the analytical methods and theories related to the chemical information of substances, such as their composition, content, structure, and form. It is an important branch of chemistry. In analytical chemistry, it is often necessary to analyze and test liquids, and operators need to use liquid sampling devices to take samples.

[0003] Most liquid sampling devices on the market are syringe-like devices. These devices need to be handled with care, otherwise, if they are bumped or the push rod is accidentally moved, the liquid in the syringe will drip out, which can easily pollute the environment. If it is a harmful liquid, it may also endanger human health.

[0004] Moreover, the liquid being tested often has very strict requirements on the amount of sample. When using existing liquid sampling devices for each sampling, personnel need to slowly pull the piston to control the liquid level to the required scale. This results in low extraction efficiency when testing the same chemical liquid in large batches multiple times, affecting the efficiency of chemical liquid detection and analysis. Furthermore, the volume error of the extracted liquid is very likely to occur when personnel continuously control the extraction, and the extraction accuracy cannot be stably controlled.

[0005] Therefore, a device is needed that prevents liquid from dripping after sampling and allows for easy control of the sample volume. Utility Model Content

[0006] In order to solve the above problems, the purpose of this utility model is to provide a sampling device for analytical chemistry, which makes it easy to control the volume of the sampled liquid without it dripping.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] An analytical chemistry sampling device mainly includes a sampling cylinder, a sampling head, and a fixing structure. A connecting pipe is vertically mounted at the lower end of the sampling cylinder, communicating with the sampling cylinder. The sampling head is detachably connected to the connecting pipe. A piston rod is connected inside the sampling cylinder, with a piston mounted at one end of the piston rod, the piston slidingly connected within the sampling cylinder. A piston handle is mounted at the other end of the piston rod, extending from the opening of the sampling cylinder. A handle is provided on the outside of the sampling cylinder opening, and the fixing structure is detachably mounted on the opening of the sampling cylinder.

[0009] The fixing structure mainly includes a fixing block, a ruler plate, a baffle, and a clamping plate. The fixing block has a fixing hole, and the sampling cylinder passes through the fixing hole. A connecting hole is formed on the side wall of the fixing hole, communicating with the fixing hole. A connecting stud is threaded into the connecting hole, and the connecting stud abuts against the outer side wall of the sampling cylinder inside the fixing hole. A groove is formed on the upper end face of the fixing block, and the handle is embedded in the groove. A sliding hole is formed on the fixing block, and the axis of the sliding hole is parallel to the axis of the fixing hole. The ruler plate is slidably connected within the sliding hole. A limiting hole is provided on the side, which communicates with the sliding hole. A limiting stud is threaded into the limiting hole, and the limiting stud abuts against a ruler plate inside the sliding hole. A baffle is installed at the upper end of the ruler plate, and the upper end face of the piston handle movably abuts against the lower end face of the baffle. A plate hole is provided on the ruler plate, and the distance between the plate hole and the baffle is equal to the thickness of the piston handle. A locking plate is slidably connected in the plate hole, and locking blocks are provided at both ends of the locking plate. The upper plate surface of the locking plate movably abuts against the lower end face of the piston handle, and a locking slot is provided on the locking plate, which movably locks onto the piston rod.

[0010] Furthermore, the sampling head mainly includes a connecting cylinder, a glass stopper, and a sampling tube; the connecting cylinder is made of glass and is divided into an upper part and a lower part. The inner wall of the upper part of the connecting cylinder is provided with a rubber gasket. The connecting tube is movably inserted into the upper part of the connecting cylinder. The glass stopper is vertically installed on the lower part of the connecting cylinder. The sampling tube is installed at the lower end of the connecting cylinder and is connected to the connecting cylinder.

[0011] Furthermore, the sampling head is movably inserted into the base, which mainly includes a sleeve and a suction cup. The suction cup is detachably installed at the bottom of the sleeve. A clamping platform is provided inside the sleeve, and a tube hole is opened on the clamping platform. The sampling head is movably inserted into the sleeve, and the lower end face of the connecting tube rests against the upper end face of the clamping platform. The sampling tube is inserted into the tube hole.

[0012] Furthermore, the upper end face of the suction cup is provided with an annular disc, the sleeve is inserted into the disc, and absorbent cotton is movably placed on the upper end face of the suction cup.

[0013] Furthermore, the ruler plate has height scale lines along its length.

[0014] Furthermore, the sampling tube is made of a transparent material.

[0015] Furthermore, the sampling tube is provided with depth scale lines.

[0016] Furthermore, the width of the baffle is smaller than the diameter of the piston handle.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This utility model achieves the purpose of controlling the sampling amount of liquid by adjusting the position of the ruler plate on the fixed block of the fixed structure and then using the baffle at the upper end of the ruler plate to limit the piston handle.

[0019] 2. When the piston rod is pulled, the liquid to be tested is drawn into the sampling tube through the sampling head. The sampling head is then closed by the glass stopper on the sampling head, which prevents the liquid in the sampling tube from dripping, thus reducing environmental pollution and harm to the human body.

[0020] 3. After the sampling tube extracts liquid through the sampling head, it can be temporarily placed on the base so that the sampling tube can be kept vertical. The opening of the sampling tube is not easily contaminated, and any liquid that is accidentally dripped is collected in the base, which is less likely to contaminate the external environment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the first orientation of the overall structure provided in this embodiment of the utility model.

[0022] Figure 2 This is a schematic diagram of the overall structure provided in the embodiment of this utility model from a second perspective.

[0023] Figure 3 This is a schematic diagram of the overall structure provided in the embodiment of this utility model from the third position.

[0024] Figure 4 This is a front view of the overall structure provided in the embodiment of this utility model.

[0025] Figure 5 This is a schematic diagram of the unused base provided in an embodiment of this utility model.

[0026] Figure 6 This is a schematic diagram of the sliding of the card plate provided in an embodiment of this utility model.

[0027] Among them, 1 is a suction cup, 2 is a sleeve, 3 is a sampling tube, 4 is a fixing block, 5 is a handle, 6 is a slot, 7 is a connecting stud, 8 is a piston rod, 9 is a piston handle, 10 is a baffle, 11 is a locking block, 12 is a ruler plate, 13 is a limiting stud, 14 is a locking plate, 15 is a sampling tube, 16 is a glass stopper, 17 is a connecting tube, and 18 is a bayonet. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The accompanying drawings are for illustrative purposes only and represent schematic diagrams, not actual pictures. They should not be construed as limiting the present patent. In order to better illustrate the specific implementation of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures, components, and their descriptions may be omitted in the drawings. The terms "upper," "lower," "left," and "right" are used to illustrate the invention and do not represent the actual product's location. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0030] A specific embodiment, as shown in the figure, represents a preferred embodiment of this utility model. An analytical chemistry sampling device mainly includes a sampling cylinder 3, a sampling head, and a fixing structure. A connecting pipe is vertically mounted at the lower end of the sampling cylinder 3, communicating with the sampling cylinder 3. The sampling head is detachably connected to the connecting pipe. A piston rod 8 is connected inside the sampling cylinder 3. A piston is mounted at one end of the piston rod 8, slidingly connected within the sampling cylinder 3. A piston handle 9 is mounted at the other end of the piston rod 8, extending from the opening of the sampling cylinder 3. A handle 5 is provided on the outer side of the opening of the sampling cylinder 3, and the fixing structure is detachably mounted on the opening of the sampling cylinder 3.

[0031] The fixing structure mainly includes a fixing block 4, a ruler plate 12, a baffle 10, and a clamping plate 14. The fixing block 4 has a fixing hole, through which the sampling cylinder 3 passes. A connecting hole is provided on the side wall of the fixing hole, communicating with it. A connecting stud 7 is threaded into the connecting hole, abutting against the outer side wall of the sampling cylinder 3 within the fixing hole. A slot 6 is provided on the upper end face of the fixing block 4, into which the handle 5 is embedded. A sliding hole is provided on the fixing block 4, with its axis parallel to the axis of the fixing hole. The ruler plate 12 is slidably connected within the sliding hole. A limit switch is provided on the side of the fixing block 4. The limiting hole communicates with the sliding hole. A limiting stud 13 is threaded into the limiting hole and abuts against the ruler plate 12 inside the sliding hole. A baffle 10 is installed at the upper end of the ruler plate 12. The upper end face of the piston handle 9 movably abuts against the lower end face of the baffle 10. A plate hole is opened on the ruler plate 12. The distance between the plate hole and the baffle 10 is equal to the thickness of the piston handle 9. A locking plate 14 is slidably connected in the plate hole. Locking blocks 11 are provided at both ends of the locking plate 14. The upper plate surface of the locking plate 14 movably abuts against the lower end face of the piston handle 9. A locking slot 18 is opened on the locking plate 14 and movably locks against the piston rod 8.

[0032] In practical use, the fixing block 4 of the fixed structure is first sleeved onto the sampling cylinder 3, and a connecting stud 7 is threaded into the connecting hole. The end of the connecting stud 7 abuts against the outer wall of the sampling cylinder 3, thereby fixing the fixing block 4 to the sampling cylinder 3. At the same time, the handle 5 at the upper end of the sampling cylinder 3 is embedded in the slot 6 at the upper end of the fixing block 4. The slot 6 limits the handle 5, preventing the sampling cylinder 3 from rotating relative to the fixing block 4. Because the fixing block 4 is fixed to the sampling cylinder 3 and cannot rotate, the horizontal position of the ruler plate 12 slidably connected in the sliding hole of the fixing block 4 remains fixed. Then, based on the required sample volume for testing, the ruler 12 is not fixed at this point. Pulling the piston rod 8 so that the lower end of the piston is at the desired liquid volume mark, the piston handle 9 is placed against the lower end of the baffle 10. Then, a limiting stud 13 is threaded into the limiting hole, causing the limiting stud 13 to abut against the ruler 12, thus fixing the ruler 12 to the fixing block 4 and fixing the height of the baffle 10 at the upper end of the ruler 12. When multiple samples need to be drawn, only the piston rod 8 needs to be pulled each time. As long as the piston handle 9 abuts against the lower end of the baffle 10, it means the required sample volume has been reached. This eliminates the need to slowly pull the piston rod 8 and constantly monitor the depth scale on the sampling cylinder 3 each time a sample is drawn, saving time. After sampling, if the piston rod 8 or piston handle 9 is accidentally bumped, the liquid in the sampling cylinder 3 can easily drip. Therefore, a retaining plate 14 is further slidably connected within the plate hole on the ruler 12. After sample extraction, the piston handle 9 abuts against the lower end face of the baffle 10, and the sliding clamping plate 14 engages with the piston rod 8 through its locking slot 18, with the lower end face of the clamping plate 14 abutting against the lower end face of the piston handle 9. The baffle 10 and clamping plate 14 limit the piston handle 9, preventing it from moving and thus preventing the piston from sliding within the sampling cylinder 3, reducing the likelihood of liquid leakage from the sampling cylinder 3 due to piston handle 9 movement. The clamping plate 14 slides within the hole of the ruler plate 12. When not in use, the clamping plate 14 slides outwards, not obstructing the sliding of the piston handle 9 and preventing it from engaging with the piston rod 8. When in use, the clamping plate 14 slides inwards, engaging with the piston rod 8 and limiting the piston handle 9. To prevent the clamping plate 14 from falling off the ruler plate 12, clamping blocks 11 are provided at both ends of the clamping plate 14, so that the clamping plate 14 will not fall out of the plate hole when it slides outward or inward.

[0033] Even after the piston handle 9 is fixed, liquid may still drip from the sampling cylinder 3 during movement. Therefore, the sampling head further includes a connecting cylinder 17, a glass stopper 16, and a sampling tube 15. The connecting cylinder 17 is made of glass and is divided into an upper and lower part. The inner wall of the upper part of the connecting cylinder 17 is provided with a rubber gasket. The connecting tube is movably inserted into the upper part of the connecting cylinder 17. The glass stopper 16 is vertically installed on the lower part of the connecting cylinder 17, and the sampling tube 15 is installed at the lower end of the connecting cylinder 17, communicating with the connecting cylinder 17. Before sampling, the upper part of the connecting cylinder 17 is inserted into the connecting tube of the sampling cylinder 3. The internal rubber gasket improves the sealing, preventing liquid leakage and facilitating liquid extraction. After sampling is completed, the connecting tube 17 is closed using the glass stopper 16 at the lower part of the connecting tube 17, so that the liquid in the sampling tube 3 will not drip from the sampling tube 15 at the lower end of the connecting tube 17. The glass stopper 16 is used for closure, similar to the glass stopper 16 at the lower end of the separatory funnel. This is existing technology and will not be described in detail here.

[0034] After sampling, it may be necessary to temporarily place the sampling device. To reduce liquid leakage from the sampling cylinder 3 and to prevent it from rolling around, the sampling cylinder 3 is placed vertically. Furthermore, the sampling head is movably inserted into the base, which mainly includes a sleeve 2 and a suction cup 1. The suction cup 1 is detachably installed at the bottom of the sleeve 2. A retaining platform is provided inside the sleeve 2, and a tube hole is opened on the retaining platform. The sampling head is movably inserted into the sleeve 2, and the lower end of the connecting cylinder 17 rests against the upper end of the retaining platform. The sampling tube 15 is inserted into the tube hole. When temporary placement of the sampling cylinder 3 is required, the base is placed in the desired location. The suction cup 1 can be used to fix the base on a horizontal surface, preventing it from tipping over. Then, the sampling head at the lower end of the sampling cylinder 3 is inserted into the tube hole in the retaining platform of the sleeve 2. The sleeve 2 provides a limiting position, preventing the sampling cylinder 3 from tipping over.

[0035] Furthermore, the upper end face of the suction cup 1 is provided with an annular disc, the sleeve 2 is inserted into the disc, and absorbent cotton is movably placed on the upper end face of the suction cup 1. If liquid drips from the sampling cylinder 3, it is absorbed by the absorbent cotton. When it is necessary to clean the base, the sleeve 2 and the disc are disassembled, the absorbent cotton is discarded, and then it can be cleaned.

[0036] Furthermore, the ruler plate 12 has height scale lines along its length to facilitate adjustment of the height of the ruler plate 12.

[0037] Furthermore, the sampling tube 3 is made of a transparent material, making it easy to view the volume of the liquid inside.

[0038] Furthermore, the sampling cylinder 3 is provided with depth scale lines to facilitate viewing the amount of liquid inside the sampling cylinder 3.

[0039] Furthermore, the width of the baffle 10 is smaller than the diameter of the piston handle 9, so that the baffle 10 will not obstruct the movement of the piston handle 9.

[0040] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. A sampling device for analytical chemistry, characterized by: Mainly include sampling cylinder, sampling head, fixed structure, the lower end of the sampling cylinder is provided with a vertical installation of connecting pipe, the connecting pipe is communicated with the sampling cylinder, the connecting pipe is detachably connected with the sampling head, the piston rod is connected in the sampling cylinder, one end of the piston rod is provided with a piston, the piston is slidably connected in the sampling cylinder, the other end of the piston rod is provided with a piston handle, the piston handle extends out of the cylinder port of the sampling cylinder, the outside of the cylinder port of the sampling cylinder is provided with a handle, the cylinder port of the sampling cylinder is detachably provided with a fixed structure. The fixed structure mainly comprises a fixed block, a ruler plate, a baffle and a clamping plate, a fixed hole is formed in the fixed block, the sampling cylinder is arranged in the fixed hole, a connecting hole is formed in the side wall of the fixed hole, the connecting hole is communicated with the fixed hole, a connecting stud is screwed in the connecting hole, the connecting stud abuts against the outer side wall of the sampling cylinder in the fixed hole, a clamping groove is formed in the upper end surface of the fixed block, the handle is embedded in the clamping groove, a sliding hole is formed in the fixed block, the axis of the sliding hole is parallel to the axis of the fixed hole, the ruler plate is slidably connected in the sliding hole, a limiting hole is formed in the side surface of the fixed block, the limiting hole is communicated with the sliding hole, a limiting stud is screwed in the limiting hole, the limiting stud abuts against the ruler plate in the sliding hole, the upper end of the ruler plate is provided with a baffle, the upper end surface of the piston handle movably abuts against the lower end surface of the baffle, a plate hole is formed in the ruler plate, the distance between the plate hole and the baffle is equal to the thickness of the piston handle, the clamping plate is slidably connected in the plate hole, clamping blocks are arranged at the two ends of the clamping plate, the upper plate surface of the clamping plate movably abuts against the lower end surface of the piston handle, a clamping hole is formed in the clamping plate, the clamping hole movably clamps the piston rod.

2. A sampling device for analytical chemistry as claimed in claim 1, characterized in that The sampling head mainly comprises a connecting cylinder, a glass plug and a sampling pipe, the connecting cylinder is made of glass, the connecting cylinder is divided into an upper part and a lower part, a rubber pad is arranged around the inner wall of the upper part of the connecting cylinder, the connecting pipe is movably inserted into the upper part of the connecting cylinder, the lower part of the connecting cylinder is vertically provided with a glass plug, the lower end of the connecting cylinder is provided with a sampling pipe, and the sampling pipe is communicated with the connecting cylinder.

3. A sampling device for analytical chemistry as claimed in claim 2, characterized in that: The sampling head is movably inserted into the base, the base mainly comprises a sleeve and a suction disc, the suction disc is movably arranged on the bottom of the sleeve, a clamping table is arranged in the sleeve, a pipe hole is formed in the clamping table, the sampling head is movably inserted into the sleeve, the lower end surface of the connecting cylinder is placed on the upper end surface of the clamping table, and the sampling pipe is inserted into the pipe hole.

4. A sampling device for analytical chemistry as claimed in claim 3, characterized in that: The upper end surface of the suction disc is provided with an annular disc cylinder, the sleeve is inserted into the disc cylinder, and the upper end surface of the suction disc movably places a water-absorbing cotton.

5. A sampling device for analytical chemistry as claimed in claim 1, characterized in that: The ruler plate is provided with a height scale along the length direction.

6. A sampling device for analytical chemistry as defined in claim 1, characterized in that The sampling cylinder is made of transparent material.

7. A sampling device for analytical chemistry as claimed in claim 1, characterized in that: Depth scale is arranged on the sampling cylinder.

8. A sampling device for analytical chemistry as defined in claim 1, characterized in that The width of the baffle is smaller than the diameter of the piston handle.

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