Sampling device for chemical raw material production and processing
By designing a telescopic sampling device, which uses compressed gas to control the extension and retraction of the sampling tube and negative pressure absorption, the safety problem of chemical raw material sampling is solved, realizing automated sampling and improved safety.
Patent Information
- Application Number
- CN202520415025.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-11
AI Technical Summary
When sampling chemical raw materials, the raw materials tend to adhere to the sampling tools and fall off when retrieved, causing injury to workers. Existing sampling methods are not safe enough.
A telescopic sampling device was designed, including a telescopic intermediate tube and an inner sleeve, equipped with a sealing cap and a negative pressure suction piston. The telescopic extension and negative pressure suction of the sampling tube are controlled by compressed gas to prevent chemical raw materials from falling out.
It enables automated sampling of chemical raw materials, reduces the labor intensity of workers, improves the safety of the sampling process, and prevents chemical raw materials from coming into contact with the human body.
Smart Images
Figure CN223883259U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to chemical raw material sampling technical field, specifically a sampling device for chemical raw material production and processing. BACKGROUND
[0002] Chemical raw material refers to the substance used in chemical industry production process, as starting material or auxiliary material, after chemical reaction or physical processing, finally converted into various chemical products, chemical raw material in production and processing process, in order to be able to timely understand the degree of chemical reaction and the quality condition of intermediate product, need to sample and analyze the material of each stage, such as in polymerization reaction, regularly sample detects the molecular weight, polymerization degree and other indexes of polymer, can judge whether the reaction is normal, so as to adjust process parameters in time;
[0003] For small or low-risk batch reactor, manual sampling is often used, and some reactors are provided with discharge ports, which are controlled by switches, and this sampling method is easy to splash chemical raw materials on the human body at the moment when the switch is opened, so it is not commonly used, and another kind of sampling hole is opened on the side of the reactor, and then the sampling tool is inserted into the reactor by the probe rod.
[0004] However, in practice, it has been noticed that although some chemical raw materials are less dangerous, they can still cause damage to the human body, and when sampling, one end of the sampling tool needs to be immersed in the chemical raw material, and the part immersed in the chemical raw material will attach some chemical raw material, and when it is withdrawn, the attached chemical raw material will fall down, and the falling chemical raw material is very easy to fall on the worker, causing the worker to be injured. UTILITY MODEL CONTENT
[0005] The utility model aims at providing a sampling device for chemical raw material production and processing, the telescopic probe rod is convenient to carry and use, and the outermost sleeve end is provided with a sealing cover, which can shield the bottom of the sampling tube after sampling, preventing the attached chemical raw material from falling on the worker. To solve the technical problems raised in the above background art.
[0006] To achieve the above object, the utility model provides the following technical scheme:
[0007] A sampling device for chemical raw material production and processing, comprising a handle outer tube, a telescopic intermediate tube and an inner sleeve tube which are sequentially movably connected from top to bottom, and the bottom of the inner sleeve tube is fixedly connected with a sampling tube, and the sampling tube is slidably connected with a negative pressure suction piston;
[0008] The handle outer tube comprises an outer sleeve pipe arranged at the outermost side, and the outer sleeve pipe is movably connected with a protective cover near one end of the telescopic intermediate pipe; the telescopic intermediate pipe comprises a sliding pipe inserted below the outer sleeve pipe; the inner sleeve pipe comprises an extension pipe inserted below the sliding pipe;
[0009] The outer sleeve pipe is fixedly connected with a fixed lug plate in a symmetrical manner on the side surface, the protective cover comprises an extension plate located between the two fixed lug plates, the extension plate is fixedly connected with a fixed shaft movably connected with the fixed lug plate on both sides, and the extension plate is fixedly connected with a conical cap at the end away from the fixed shaft.
[0010] As a further technical scheme of the utility model, the outer side of the fixed shaft is sleeved with a torsion spring, the two torsion springs are located on both sides of the extension plate respectively, and one end of the torsion spring is clamped with the side surface of the outer sleeve pipe, and the other end of the outer sleeve pipe is clamped with the side surface of the conical cap.
[0011] As a further technical scheme of the utility model, the top end of the sliding pipe and the top end of the inner sleeve pipe are fixedly connected with a top sealing ring respectively, wherein the top sealing ring of the end portion of the sliding pipe is in sliding fit with the inner side of the outer sleeve pipe, and the top sealing ring of the end portion of the inner sleeve pipe is in sliding fit with the inner side of the sliding pipe.
[0012] As a further technical scheme of the utility model, the bottom of the outer sleeve pipe and the bottom of the sliding pipe are integrally provided with a limiting stopper respectively, and the side surface of the sliding pipe and the side surface of the extension pipe are respectively provided with a first limiting sliding groove and a second limiting sliding groove corresponding to the limiting stopper.
[0013] As a further technical scheme of the utility model, the limiting stopper of the end portion of the outer sleeve pipe is inserted into the first limiting sliding groove on the side surface of the sliding pipe, and the limiting stopper of the end portion of the sliding pipe is inserted into the second limiting sliding groove on the side surface of the extension pipe.
[0014] As a further technical scheme of the utility model, the sampling pipe comprises a corrosion-resistant pipe, the top end of the corrosion-resistant pipe is integrally provided with a threaded connector fixedly connected with the extension pipe, and the other end of the corrosion-resistant pipe is integrally provided with a conical sampling head.
[0015] As a further technical scheme of the utility model, the side surface of the conical sampling head is embedded with a transparent observation window, the side surface of the conical sampling head is provided with a third limiting sliding groove corresponding to the second limiting sliding groove, and the third limiting sliding groove corresponding to the second limiting sliding groove is arranged in coincidence.
[0016] As a further technical scheme of the utility model, the negative pressure suction piston comprises a piston rod extending to the inner side of the corrosion-resistant pipe through the threaded connector, wherein one end of the piston rod extending to the inner side of the corrosion-resistant pipe is fixedly connected with a sampling piston head, and the other end of the piston rod is fixedly connected with a negative pressure piston plate.
[0017] As a further technical scheme of the utility model, the negative pressure piston plate is inserted in the inner side of the extension pipe and is in sliding connection with the inner side of the extension pipe, the outer sleeve pipe, the sliding pipe and the inner side of the extension pipe are in mutual communication.
[0018] Compared with the prior art, the utility model has the advantages that:
[0019] 1. The utility model discloses, compressed gas enters the inner side of the outer sleeve pipe through the hole on the connecting cap, pushes the telescopic intermediate pipe to move downwards in the inner side of the outer sleeve pipe, until the first limiting sliding slot on the telescopic intermediate pipe is blocked by the limiting stopper, then pushes the inner sleeve pipe to move downwards in the inner side of the sliding pipe again, until the sampling pipe arranged at the end of the inner sleeve pipe is immersed in the chemical raw material, through the mutual cooperation between the handle outer pipe, the telescopic intermediate pipe and the inner sleeve pipe, the sampling pipe can be automatically telescoped, and the labor intensity of workers is reduced.
[0020] 2. The utility model discloses, the compressed air in the outer sleeve pipe is sucked out through the pipeline, so that the inner side of the outer sleeve pipe forms negative pressure, the negative pressure preferentially pulls the negative pressure suction piston to move upwards in the inner side of the sampling pipe, so that the chemical raw material enters the corrosion -resistant pipe from the opening at the bottom, then along with the increase of the internal negative pressure, the extension pipe is driven to retract in the inner side of the sliding pipe, the sliding pipe retracts in the inner side of the outer sleeve pipe, and the extension pipe drives the corrosion -resistant pipe to move to the inner side of the extension pipe, so that the tool is stored, the volume of the device is reduced while automatic sampling, so that it is more convenient to carry.
[0021] 3. The utility model discloses, after the extension pipe drives the corrosion -resistant pipe to move to the inner side of the extension pipe, the end of the torsional spring pushes the conical cap to rotate, through the rotation cooperation between the fixed shaft and the fixed lug plate, the conical cap is rotated to the lower side of the corrosion -resistant pipe with the fixed shaft as the axis, and the chemical raw material attached to the outer side of the corrosion -resistant pipe falls into the conical cap, so that the chemical raw material is taken, the chemical raw material falling off is prevented from contacting the human body, and the safety of the device when being used is further improved. ACCURACY OF DRAWINGS
[0022] Figure 1 It is the structure schematic diagram of the utility model in use state.
[0023] Figure 2 It is the local enlarged schematic diagram of the utility model Figure 1 .
[0024] Figure 3 It is the three-dimensional structure schematic diagram of the handle outer pipe in the utility model.
[0025] Figure 4 It is the local enlarged schematic diagram of the utility model Figure 3 .
[0026] Figure 5 is a part structure schematic view of the utility model Figure 1 .
[0027] Figure 6 is a bottom structure schematic view of the utility model Figure 5 .
[0028] Figure 7 is a position structure schematic view of the sampling pipe and negative pressure suction piston in the utility model.
[0029] Figure 8 is a three-dimensional structure schematic view of the sampling pipe in the utility model.
[0030] Figure 9 is a three-dimensional structure schematic view of the negative pressure suction piston in the utility model.
[0031] In the drawing:
[0032] Connecting cap-1, handle outer pipe-2, outer sleeve pipe-21, limit stopper-22, sealing clamping groove-23, telescopic intermediate pipe-3, sliding pipe-31, first limit protrusion-32, top sealing ring-33, first limit sliding groove-34, inner sleeve pipe-4, extension pipe-41, second limit protrusion-42, second limit sliding groove-43, sampling pipe-5, corrosion-resistant pipe-51, transparent observation window-52, third limit sliding groove-53, conical sampling head-54, threaded connecting head-55, protective cover-6, conical cap-61, extension plate-62, fixed shaft-63, torsional spring-64, fixed ear plate-7, negative pressure suction piston-8, piston rod-81, negative pressure piston plate-82, sampling piston head-83. DETAILED DESCRIPTION
[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the utility model.
[0034] Please refer to Figures 1-9 , the utility model embodiment provides a kind of sampling device for chemical raw material production and processing, including handle outer pipe 2, telescopic intermediate pipe 3 and inner sleeve pipe 4 by upper and lower sequentially movable connection, and the bottom of inner sleeve pipe 4 is fixedly connected with sampling pipe 5, and negative pressure suction piston 8 is slidably fitted in sampling pipe 5;
[0035] The handle outer tube 2 comprises an outer sleeve 21 arranged at the outermost side, and the outer sleeve 21 is movably connected with a protective cover 6 near one end of the telescopic intermediate tube 3.
[0036] The outer sleeve 21 is fixedly connected with a fixed lug plate 7 in a symmetrical manner on the side, and the protective cover 6 comprises an extension plate 62 located between the two fixed lug plates 7, and the extension plate 62 is fixedly connected with a fixed shaft 63 movably connected with the fixed lug plate 7 on both sides, and one end of the extension plate 62 away from the fixed shaft 63 is fixedly connected with a conical cap 61.
[0037] In the embodiment, the outer side of the fixed shaft 63 is sleeved with a torsion spring 64, and the two torsion springs 64 are located on both sides of the extension plate 62, and one end of the torsion spring 64 is clamped with the side of the outer sleeve 21, and the other end of the outer sleeve 21 is clamped with the side of the conical cap 61.
[0038] By adopting the above technical scheme, after the sampling tube 5 moves to the inside of the extension tube 41, the end of the torsion spring 64 pushes the conical cap 61 to rotate, and through the rotation cooperation between the fixed shaft 63 and the fixed lug plate 7, the conical cap 61 rotates to below the corrosion-resistant tube 51 with the fixed shaft 63 as the axis, and the chemical raw materials attached to the outside of the corrosion-resistant tube 51 will fall into the conical cap 61, so as to take the chemical raw materials, prevent the fallen chemical raw materials from contacting the human body, and further improve the safety of the device in use.
[0039] Further, the top end of the sliding tube 31 and the top end of the inner sleeve 4 are fixedly connected with a top sealing ring 33 respectively, wherein the top sealing ring 33 at the end of the sliding tube 31 is in sliding cooperation with the inside of the outer sleeve 21, and the top sealing ring 33 at the end of the inner sleeve 4 is in sliding cooperation with the inside of the sliding tube 31.
[0040] Further, the bottom of the outer sleeve 21 and the bottom of the sliding tube 31 are integrally provided with a limiting stop 22 respectively, and the side of the sliding tube 31 and the side of the extension tube 41 are respectively provided with a first limiting sliding groove 34 and a second limiting sliding groove 43 corresponding to the limiting stop 22.
[0041] Specifically, the limiting stop 22 at the end of the outer sleeve 21 is inserted into the first limiting sliding groove 34 on the side of the sliding tube 31, and the limiting stop 22 at the end of the sliding tube 31 is inserted into the second limiting sliding groove 43 on the side of the extension tube 41.
[0042] Further, the sampling tube 5 comprises a corrosion-resistant tube 51, and the top end of the corrosion-resistant tube 51 is integrally provided with a threaded connector 55 fixedly connected with the extension tube 41, and the other end of the corrosion-resistant tube 51 is integrally provided with a conical sampling head 54.
[0043] Specifically, the side surface of the conical sampling head 54 is embedded with a transparent observation window 52, and the side surface of the conical sampling head 54 is provided with a third limiting sliding groove 53 corresponding to the second limiting sliding groove 43, and the third limiting sliding groove 53 corresponding to the second limiting sliding groove 43 is arranged in coincidence.
[0044] By adopting the above technical scheme, the compressed gas enters the inside of the outer sleeve 21 through the hole on the connecting cap 1, pushes the telescopic intermediate pipe 3 to move downward in the inside of the outer sleeve 21, until the first limiting sliding groove 34 on the telescopic intermediate pipe 3 is blocked by the limiting block 22, then the inner sleeve 4 is pushed to move downward in the inside of the sliding pipe 31 again, until the sampling pipe 5 arranged at the end of the inner sleeve 4 is immersed in the chemical raw material, through the mutual cooperation between the receivable handle outer pipe 2, the telescopic intermediate pipe 3 and the inner sleeve 4, the automatic telescoping of the sampling pipe 5 is facilitated, and the labor intensity of workers is reduced.
[0045] Further, the negative pressure suction piston 8 comprises a piston rod 81 extending to the inside of the corrosion-resistant pipe 51 through the threaded connecting head 55, wherein one end of the piston rod 81 extending to the inside of the corrosion-resistant pipe 51 is fixedly connected with a sampling piston head 83, and the other end of the piston rod 81 is fixedly connected with a negative pressure piston plate 82.
[0046] Further, the negative pressure piston plate 82 is inserted into and slidably connected with the inside of the extension pipe 41, and the inside of the outer sleeve 21, the sliding pipe 31 and the extension pipe 41 are in communication with each other.
[0047] By adopting the above technical scheme, the compressed air in the inside of the outer sleeve 21 is sucked out through the pipeline, so that the inside of the outer sleeve 21 forms a negative pressure, the negative pressure preferentially drives the negative pressure suction piston 8 to move upward in the inside of the sampling pipe 5, so that the chemical raw material enters the corrosion-resistant pipe 51 from the opening at the bottom, then with the increase of the internal negative pressure, the extension pipe 41 is driven to retract into the inside of the sliding pipe 31, the sliding pipe 31 retracts into the inside of the outer sleeve 21, and the extension pipe 41 drives the corrosion-resistant pipe 51 to move to the inside of the extension pipe 41, so that the tool is stored, the automatic sampling is realized, and the volume of the device is reduced, so that it is more convenient to carry.
[0048] Further, the side of the sliding pipe 31 away from the first limiting sliding groove 34 is integrally provided with a first limiting protrusion 32, and the outer sleeve 21 is provided with a groove corresponding to the first limiting protrusion 32, when the sliding pipe 31 moves in the inside of the outer sleeve 21, the first limiting protrusion 32 slides in the corresponding groove, and plays a positioning role.
[0049] Further, the extension pipe 41 is integrally provided with a second limiting protrusion 42 on one side away from the second limiting sliding groove 43, and a corresponding groove is formed in the sliding pipe 31, and the second limiting sliding groove 43 is in sliding fit with the corresponding groove when moving in the inside of the sliding pipe 31.
[0050] Further, when the sliding pipe 31 moves downward to the limit position, the limiting block 22 in the outer sleeve pipe 21 is in contact with the end of the first limiting sliding groove 34, and at this time, the top sealing ring 33 at the top of the extension pipe 41 is just clamped in the sealing clamping groove 23 at the bottom of the handle outer pipe 2, thereby playing a locking role.
[0051] In detail, similarly, when the extension pipe 41 reaches the limit position, the top sealing ring 33 at the top end of the extension pipe 41 is in clamping fit with the sealing clamping groove 23 at the bottom of the sliding pipe 31, and when air is sucked outwards, due to the mutual fit of the top sealing ring 33 and the sealing clamping groove 23, the outer sleeve pipe 21, the sliding pipe 31 and the extension pipe 41 will not act first, but the negative pressure suction piston 8 will move upward first, and when the negative pressure suction piston 8 reaches the limit position at the top end, the top sealing ring 33 will be separated from the inside of the sealing clamping groove 23 with the increase of the negative pressure, so that the extension pipe 41 is retracted into the inside of the sliding pipe 31 or the sliding pipe 31 is retracted into the inside of the outer sleeve pipe 21.
[0052] The working principle of the utility model is: when in use, firstly, the gas outlet of the external compressor is fixedly connected with the connecting cap 1 through a pipeline, then the compressed gas enters the inside of the outer sleeve pipe 21 through the connecting cap 1, the compressed gas pushes the negative pressure piston plate 82 to move downward in the inside of the extension pipe 41, and the negative pressure piston plate 82 pushes the sampling piston head 83 to move in the inside of the corrosion-resistant pipe 51 through the piston rod 81, so that the gas in the inside of the corrosion-resistant pipe 51 is discharged, when the negative pressure suction piston 8 reaches the limit position, the compressed gas pushes the extension pipe 41 to slide downward in the inside of the sliding pipe 31, until the top sealing ring 33 at the top end of the extension pipe 41 is in clamping fit with the sealing clamping groove 23 at the bottom of the sliding pipe 31, then the sliding pipe 31 moves downward in the inside of the outer sleeve pipe 21, until the handle outer pipe 2, the telescopic intermediate pipe 3 and the inner sleeve pipe 4 are all unfolded, so that the end of the sampling pipe 5 is ensured to be immersed in the chemical raw material to be sampled.
[0053] Then the pipeline is removed from the outlet of the external compressor and replaced to the inlet, the air inside the sleeve pipe 21 is extracted, the inside of the sleeve pipe 21, the sliding pipe 31 and the extension pipe 41 gradually form negative pressure, due to the cooperation of the top sealing ring 33 and the sealing clamping groove 23, the sleeve pipe 21, the sliding pipe 31 and the extension pipe 41 do not act first, but the negative pressure suction piston 8 moves upward first, the negative pressure piston plate 82 moves the sampling piston head 83 inside the corrosion-resistant pipe 51 through the piston rod 81, since the opening at the bottom of the conical sampling head 54 is immersed in the chemical raw materials, the negative pressure inside the corrosion-resistant pipe 51 can suck the chemical raw materials, when the negative pressure suction piston 8 reaches the limit position of the top end, the top sealing ring 33 can be separated inside the sealing clamping groove 23 only when the negative pressure increases, so that the extension pipe 41 is retracted inside the sliding pipe 31 or the sliding pipe 31 is retracted inside the sleeve pipe 21;
[0054] When the sampling pipe 5 moves to the inside of the extension pipe 41, the end of the torsion spring 64 pushes the conical cap 61 to rotate, through the rotation cooperation between the fixed shaft 63 and the fixed lug plate 7, the conical cap 61 rotates below the corrosion-resistant pipe 51 with the fixed shaft 63 as the axis, and the chemical raw materials attached to the outside of the corrosion-resistant pipe 51 will fall into the conical cap 61, so as to take the chemical raw materials and prevent the fallen chemical raw materials from contacting the human body, which is simple in structure, convenient to operate and effectively reduces the labor intensity.
[0055] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims instead of the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.
[0056] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.
Claims
1. A sampling device for chemical raw material production and processing, characterized in that: It includes handle outer tube (2), telescopic intermediate tube (3) and inner sleeve (4) which are connected in turn from top to bottom, and the bottom of inner sleeve (4) is fixedly connected with sampling tube (5), and the sampling tube (5) is slidably connected with negative pressure suction piston (8); Wherein, the handle outer tube (2) includes outer sleeve (21) arranged at the outermost side, and the outer sleeve (21) is movably connected with protective cover (6) near one end of telescopic intermediate tube (3), the telescopic intermediate tube (3) includes sliding tube (31) inserted below the outer sleeve (21), and the inner sleeve (4) includes extension tube (41) inserted below the sliding tube (31); The side surface of the outer sleeve (21) is fixedly connected with fixed ear plate (7) in a symmetrical manner, and the protective cover (6) includes extension plate (62) located between the two fixed ear plates (7), the two sides of the extension plate (62) are fixedly connected with fixed shaft (63) movably connected with the fixed ear plate (7), and one end of the extension plate (62) away from the fixed shaft (63) is fixedly connected with conical cap (61).
2. The sampling device for the production and processing of chemical raw materials according to claim 1, characterized in that: The outer side of the fixed shaft (63) is sleeved with torsional spring (64), and the two torsional springs (64) are located on the two sides of the extension plate (62) respectively, and one end of the torsional spring (64) is clamped with the side surface of the outer sleeve (21), and the other end of the outer sleeve (21) is clamped with the side surface of the conical cap (61).
3. The sampling device for the production and processing of chemical raw materials according to claim 1, characterized in that: The top end of the sliding tube (31) and the top end of the inner sleeve (4) are fixedly connected with top sealing ring (33) respectively, wherein the top sealing ring (33) at the end of the sliding tube (31) is slidably connected with the inner side of the outer sleeve (21), and the top sealing ring (33) at the end of the inner sleeve (4) is slidably connected with the inner side of the sliding tube (31).
4. The sampling device for the production and processing of chemical raw materials according to claim 1, characterized in that: The bottom of the outer sleeve (21) and the bottom of the sliding tube (31) are integrally provided with limiting stopper (22) respectively, and the side surface of the sliding tube (31) and the side surface of the extension tube (41) are respectively provided with first limiting sliding groove (34) and second limiting sliding groove (43) corresponding to the limiting stopper (22).
5. The sampling device for chemical raw material production and processing according to claim 1, characterized in that, The limiting stopper (22) at the end of the outer sleeve (21) is inserted into the first limiting sliding groove (34) in the side surface of the sliding tube (31), and the limiting stopper (22) at the end of the sliding tube (31) is inserted into the second limiting sliding groove (43) in the side surface of the extension tube (41).
6. The sampling device for the production and processing of chemical raw materials according to claim 1, characterized in that: The sampling tube (5) includes corrosion-resistant tube (51), and the top end of the corrosion-resistant tube (51) is integrally provided with threaded connector (55) fixedly connected with the extension tube (41), and the other end of the corrosion-resistant tube (51) is integrally provided with conical sampling head (54).
7. The sampling device for the production and processing of chemical raw materials according to claim 1, characterized in that: The side surface of the conical sampling head (54) is embedded with transparent observation window (52), and the side surface of the conical sampling head (54) is provided with third limiting sliding groove (53) corresponding to the second limiting sliding groove (43), and the third limiting sliding groove (53) corresponding to the second limiting sliding groove (43) is arranged in coincidence.
8. The sampling device for the production and processing of chemical raw materials according to claim 1, characterized in that: The negative pressure suction piston (8) comprises a piston rod (81) extending to the inside of a corrosion-resistant pipe (51) through a threaded connector (55), wherein one end of the piston rod (81) extending to the inside of the corrosion-resistant pipe (51) is fixedly connected with a sampling piston head (83), and the other end of the piston rod (81) is fixedly connected with a negative pressure piston plate (82).
9. The sampling device for the production of chemical raw materials according to claim 8, characterized in that: The negative pressure piston plate (82) is inserted into and in sliding connection with the inside of the extension pipe (41), and the inside of the outer sleeve pipe (21), the sliding pipe (31) and the extension pipe (41) are in communication with each other.