Controllable chemical sampling device

Abstract

The utility model discloses a controllable chemical sampling device and relates to the technical field of sampling. The device comprises an outer cylinder, wherein a liquid taking cylinder is fixedly connected in the outer cylinder; a reset mechanism is movably connected between the inner side of the outer cylinder and the outer side of the liquid taking cylinder, the outer side of the outer cylinder is movably connected with a limiting mechanism, and the length of the limiting mechanism is matched with that of the reset mechanism. A meter is arranged on the outer side of the outer cylinder, and the limiting mechanism is used for limiting the reset position of the reset mechanism. A sampling tube is mounted at the bottom of the outer cylinder. According to the chemical additive sampling device, the liquid taking cylinder is arranged in the outer cylinder, and the reset cylinder with the reset spring is arranged between the liquid taking cylinder and the outer cylinder, so that the chemical additive sampling device can realize single-hand sampling of chemical additives, and the pollution of the reset spring to sampling is avoided after sampling; accurate control over the sampling dosage is achieved, and the stability of the sampling process is maintained.

Description

Technical Field

[0001] This utility model belongs to the field of sampling technology, and specifically relates to a controllable chemical sampling device. Background Technology

[0002] Chemical auxiliaries are excipients and additives used in the production of pharmaceuticals and the preparation of prescriptions. They are the general term for all materials other than the main active pharmaceutical ingredient and are an important component of pharmaceutical preparations. According to their form, auxiliaries can be divided into solid auxiliaries, liquid auxiliaries, and gaseous auxiliaries. Sampling is divided into several stages, including sampling preparation, sampling process, and post-sampling processing. Safety should be taken into account during the sampling process to avoid contamination and loss and to ensure that the sample is representative. When sampling liquid auxiliaries, pipettes are often used for auxiliary sampling.

[0003] The patent specification with publication number CN219694642U discloses a chemical reagent and auxiliary sampler, including a cylinder, a piston is movably disposed inside the cylinder, the piston is fixedly connected to one end of a piston rod, the other end of the piston rod movably passes through the cylinder and is fixedly provided with a pressure handle, a return spring is sleeved on the outer wall of the piston rod and fixed between the piston and the inner wall of the cylinder, and an adjustable metering component is provided on the outer wall of the cylinder;

[0004] The shortcomings of this technical solution are as follows: First, the spring used for piston reset in the sampler is located inside the cylinder. After the spring rebounds, both the sampled liquid chemical additive and the spring are inside the cylinder. However, some chemical additives are prone to oxidation reactions with the spring after contact with metal, leading to contamination of the chemical additives. This is also why sampling tubes are mostly made of high-molecular-weight polymer plastic products. In other words, the spring is easily contaminated with the sampled liquid after sampling. Second, the sampler limits the downward position of the pressure handle through an adjustable metering component, resulting in differences in the piston's rebound distance, thereby controlling the liquid volume. However, the basic principle of liquid sampling is to create an internal negative pressure by venting the air in the tube, and then the piston pulls back to form an attraction force due to the pressure difference between the inside and outside of the cylinder. The adjustable metering component directly blocks the piston from venting the gas inside the cylinder, resulting in a small pressure difference between the inside and outside of the cylinder when the piston resets. In actual use, it is impossible to effectively absorb the additives, and the smaller the required liquid volume, the worse the sampler's liquid sampling ability.

[0005] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0006] The purpose of this utility model is to provide a controllable chemical sampling device, and the technical problem to be solved is as follows: existing chemical auxiliary agent sampling devices have the problems of easy contamination of the sampling liquid and unstable sampling capacity during use.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A controllable chemical sampling device includes an outer cylinder, inside which a liquid sampling tube is fixedly connected; a reset mechanism is movably connected between the inner side of the outer cylinder and the outer side of the liquid sampling tube, and a limit mechanism is movably connected to the outer side of the outer cylinder, the length of which is adapted to the length of the reset mechanism; a meter is provided on the outer side of the outer cylinder, and the limit mechanism is used to limit the reset position of the reset mechanism; a sampling tube is installed at the bottom of the outer cylinder.

[0009] As a further embodiment of this utility model: the reset mechanism includes a reset spring fixedly connected to the top of the inner cavity of the outer cylinder, a bottom ring fixedly connected to the bottom of the reset spring, a reset cylinder fixedly connected to the top of the inner side of the bottom ring, and the top of the reset cylinder extending to the outer side of the top of the outer cylinder.

[0010] As a further embodiment of this utility model: a push rod is fixedly connected to the middle of the inner side of the top of the reset cylinder, a piston is fixedly connected to the bottom end of the push rod, the circumferential side of the piston is in contact with the inner wall of the liquid collection cylinder, and the bottom surface of the piston is flush with the bottom surface of the bottom ring.

[0011] As a further embodiment of this utility model: the top of the reset cylinder is provided with a plurality of air passage holes along the circumferential direction, the side wall of the reset cylinder is separated from the adjacent sides of the outer cylinder and the liquid collection cylinder, and the horizontal cross section of the push rod is cross-shaped.

[0012] As a further embodiment of this utility model: the limiting mechanism includes a hoop sleeved on the outer wall of the outer cylinder, a wing nut installed on one side of the hoop, and a limiting frame fixedly connected to the top of the hoop.

[0013] As a further embodiment of this utility model: the vertical distance between the bottom surface of the hoop and the top surface of the limiting frame is equal to the vertical distance between the bottom ring and the top surface of the reset cylinder.

[0014] The beneficial effects of this utility model are:

[0015] By setting a liquid-collecting cylinder inside the outer cylinder and installing a return spring between the outer cylinder and the liquid-collecting cylinder, and fixing the return cylinder above the bottom ring fixedly connected to the bottom end of the return spring, the return cylinder extends through the top of the outer cylinder to the outside of the top of the outer cylinder. A push rod with a piston is set in the middle of the inner side of the top of the return cylinder. The piston is installed inside the liquid-collecting cylinder. When the user presses the return cylinder to the lowest position with one hand, the piston empties the air inside the liquid-collecting cylinder. The return spring is stretched and the bottom ring is in contact with the bottom surface inside the outer cylinder. When the return cylinder is released, the return spring rebounds and drives the return cylinder to move upward. The upward movement of the return cylinder drives the piston to return to its original position. This realizes the function of one-handed suction of chemical auxiliaries. Furthermore, the spring used to assist automatic suction is located on the outside of the liquid-collecting cylinder, which avoids contamination of chemical auxiliaries after liquid collection and improves the safety of liquid collection.

[0016] By installing a metering gauge on the outside of the outer cylinder, and clamping a ring with a wing nut on the outside of the outer cylinder, with a limiting frame fixedly connected to the top of the clamping gauge, and setting the reset mechanism inside the limiting mechanism with the height of the limiting mechanism and the reset mechanism adapted to each other, after clamping the ring at the predetermined liquid level of the metering gauge, when the reset cylinder rebounds to the point where it abuts the top of the limiting frame, the bottom of the piston resets to be flush with the bottom surface of the clamping gauge. The position limited by the bottom surface of the clamping gauge is the predetermined metering gauge position. This enables accurate sampling of any dosage of chemical auxiliary liquid. Furthermore, since the piston expels the air inside the sampling cylinder each time it takes a sample, the negative pressure suction environment inside the sampling cylinder can be maintained to ensure stability when sampling any dosage of chemical auxiliary liquid, thus achieving accurate and stable sampling of any dosage of chemical auxiliary liquid. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a utility model Figure 1 Enlarged detail view of point A in the middle;

[0020] Figure 3 This is a partial cross-sectional view of the present invention after the limiting mechanism has been removed;

[0021] Figure 4 This is a utility model Figure 3 Enlarged detail view of point B in the middle;

[0022] Figure 5 This is a utility model Figure 3 A magnified view of the details at point C.

[0023] In the diagram: 1. Outer cylinder; 2. Liquid sampling cylinder; 3. Reset mechanism; 31. Reset spring; 32. Bottom ring; 33. Reset cylinder; 34. Air passage hole; 4. Limiting mechanism; 41. Hoop ring; 42. Wing nut; 43. Limiting frame; 5. Measuring gauge; 6. Sampling tube; 7. Push rod; 8. Piston. Detailed Implementation

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

[0025] like Figures 1 to 5 As shown, a controllable chemical sampling device includes an outer cylinder 1, a liquid sampling cylinder 2 fixedly connected to the middle of the inner side of the outer cylinder 1, a reset mechanism 3 movably connected between the inner side of the outer cylinder 1 and the outer side of the liquid sampling cylinder 2, a limiting mechanism 4 movably connected to the outer side of the outer cylinder 1, the length of the limiting mechanism 4 being adapted to the length of the reset mechanism 3, a meter 5 being provided on the outer side of the outer cylinder 1, the limiting mechanism 4 being used to limit the reset position of the reset mechanism 3, and a sampling tube 6 being installed at the bottom of the outer cylinder 1.

[0026] It should be noted that both the outer cylinder 1 and the liquid sampling cylinder 2 are transparent polymer plastic products to avoid contamination of the sampling liquid when sampling chemical additives; the sampling tube 6 is connected to the bottom of the liquid sampling cylinder 2, so that when the reset mechanism 3 is reset, the additives can enter the interior of the liquid sampling cylinder 2 through the sampling tube 6.

[0027] like Figures 3 to 5 As shown, the reset mechanism 3 includes a reset spring 31 fixedly connected to the top of the inner cavity of the outer cylinder 1. The bottom of the reset spring 31 is fixedly connected to a bottom ring 32. The inner side of the top of the bottom ring 32 is fixedly connected to a reset cylinder 33. The reset cylinder 33 passes through the top of the outer cylinder 1 and extends to the outer side of the top of the outer cylinder 1.

[0028] A push rod 7 is fixedly connected to the middle of the inner side of the top of the reset cylinder 33, and a piston 8 is fixedly connected to the bottom of the push rod 7. The circumferential side of the piston 8 is in contact with the inner wall of the liquid collection cylinder 2, and the bottom surface of the piston 8 is flush with the bottom surface of the bottom ring 32.

[0029] Multiple vent holes 34 are provided circumferentially at the top of the reset cylinder 33. The sidewall of the reset cylinder 33 is separated from the adjacent sides of the outer cylinder 1 and the liquid taking cylinder 2. The push rod 7 is a cross-shaped straight rod (see...). Figure 5 );

[0030] It should be noted that when the user presses the top of the reset cylinder 33, the reset cylinder 33 moves down until the bottom ring 32 is in contact with the bottom surface inside the liquid dispensing cylinder 2, and the bottom surface of the piston 8 is simultaneously in contact with the bottom surface of the liquid dispensing cylinder 2. The bottom surfaces of the outer cylinder 1 and the inside of the liquid dispensing cylinder 2 are the same. When the user stops pressing the top of the reset cylinder 33, the stretched reset spring 31 rebounds, and the bottom ring 32 moves up. The reset cylinder 33, which is fixedly connected to the inner side of the top of the bottom ring 32, moves up simultaneously. The push rod 7, which is fixedly connected to the inner side of the top of the reset cylinder 33, drives the piston 8 to move up.

[0031] Specifically, during the downward movement of the reset cylinder 33, the air pressure in the space inside the liquid sampling cylinder 2 located at the top of the piston 8 is balanced by the air passage 34, and the cross-shaped push rod 7 facilitates airflow. When the reset cylinder 33 is reset, the air in the liquid sampling cylinder 2 located at the top of the piston 8 is vented sequentially through the side of the push rod 7 and the air passage 34, thereby ensuring the air pressure balance during the use of the sampler, so as to facilitate normal use of pressing and resetting.

[0032] like Figure 1 and Figure 2 As shown, the limiting mechanism 4 includes a hoop 41 sleeved on the outer wall of the outer cylinder 1, a wing nut 42 installed on one side of the hoop 41, and a limiting frame 43 fixedly connected to the top of the hoop 41.

[0033] The distance between the bottom surface of the hoop 41 and the top surface of the limiting frame 43 is equal to the distance between the bottom ring 32 and the top surface of the reset cylinder 33, that is, the height of the reset mechanism 3 is adapted to the height of the limiting mechanism 4.

[0034] It should be noted that when it is necessary to control the amount of chemical additives taken, the user can loosen the wing nut 42 and adjust the position of the hoop 41 along the outer wall of the outer cylinder 1. Since the meter 5 is set on the outer side of the outer cylinder 1, the bottom surface of the hoop 41 can be hooped to the target scale and the wing nut 42 can be locked. Since the height of the reset mechanism 3 and the height of the limiting mechanism 4 are matched, after the reset cylinder 33 is pressed to reset, the top of the reset cylinder 33 abuts against the top of the limiting frame 43, and the bottom ring 32 is flush with the bottom surface of the outer hoop 41. The bottom surface of the bottom ring 32 is also flush with the bottom surface of the piston 8. Thus, the level of additive liquid drawn by the piston 8 is level with the meter 5 of the predetermined amount of liquid taken on the outside, realizing the accurate control function of the amount of additives taken. During the suction process, the air inside the liquid taking cylinder 2 is pushed to the bottom piston 8 to be emptied. After the piston 8 is reset, it can effectively perform negative pressure suction of liquid additives, regardless of its final reset position, thus realizing the accurate liquid taking function at any scale of the meter 5.

[0035] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A controllable chemical sampling device, comprising an outer cylinder (1), characterized in that, The outer cylinder (1) is fixedly connected to a liquid sampling cylinder (2); a reset mechanism (3) is movably connected between the inner side of the outer cylinder (1) and the outer side of the liquid sampling cylinder (2); a limit mechanism (4) is movably connected to the outer side of the outer cylinder (1); the length of the limit mechanism (4) is adapted to the length of the reset mechanism (3); a meter (5) is provided on the outer side of the outer cylinder (1); the limit mechanism (4) is used to limit the reset position of the reset mechanism (3); a sampling tube (6) is installed at the bottom of the outer cylinder (1).

2. The controllable chemical sampling device according to claim 1, characterized in that, The reset mechanism (3) includes a reset spring (31) fixedly connected to the top of the inner end of the outer cylinder (1). The bottom of the reset spring (31) is fixedly connected to a bottom ring (32). The top of the inner side of the bottom ring (32) is fixedly connected to a reset cylinder (33). The top of the reset cylinder (33) extends to the outer side of the top of the outer cylinder (1).

3. The controllable chemical sampling device according to claim 2, characterized in that, A push rod (7) is fixedly connected to the middle of the inner side of the top of the reset cylinder (33), and a piston (8) is fixedly connected to the bottom of the push rod (7). The peripheral side of the piston (8) is in contact with the inner wall of the liquid collection cylinder (2), and the bottom surface of the piston (8) is flush with the bottom surface of the bottom ring (32).

4. A controllable chemical sampling device according to claim 3, characterized in that, The top of the reset cylinder (33) is provided with multiple air passages (34) along the circumferential direction. The side wall of the reset cylinder (33) is separated from the adjacent sides of the outer cylinder (1) and the liquid collection cylinder (2). The horizontal cross section of the push rod (7) is cross-shaped.

5. A controllable chemical sampling device according to claim 2, characterized in that, The limiting mechanism (4) includes a hoop (41) sleeved on the outer wall of the outer cylinder (1), a wing nut (42) is installed on one side of the hoop (41), and a limiting frame (43) is fixedly connected to the top of the hoop (41).

6. A controllable chemical sampling device according to claim 5, characterized in that, The vertical distance between the bottom surface of the hoop (41) and the top surface of the limiting frame (43) is equal to the vertical distance between the bottom ring (32) and the top surface of the reset cylinder (33).

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