Butt-joint adjusting mechanism for condenser pipe and digestion cup of COD (Chemical Oxygen Demand) analysis instrument

Abstract

The utility model discloses a butt joint adjusting mechanism for a condenser pipe and a digestion cup of a COD (Chemical Oxygen Demand) analysis instrument, and relates to the technical field of chemical experiment instruments, the COD analysis instrument comprises an instrument framework, and a first supporting plate, a second supporting plate and a heating plate which are arranged on the instrument framework at intervals from top to bottom; a first limiting step and a second limiting step are arranged on a pipe body of the condensing pipe at intervals; a third limiting step is arranged close to the opening of the digestion cup; the butt joint adjusting mechanism comprises a lifting mechanism arranged on the instrument framework and a limiting mechanism arranged on the second supporting plate, and the first supporting plate is connected with the execution end of the lifting mechanism; the first supporting plate is provided with a fixing mechanism used for fixing the condensation pipe. The fixing mechanism is arranged on the first supporting plate, and the limiting mechanism is arranged on the second supporting plate, so that the butt joint of the condensation pipe and the digestion cup is conveniently realized; after heating, the lifting mechanism controls the first supporting plate to move upwards, so that the condensation pipe is separated from the digestion cup.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical experimental instruments, in particular to a docking adjustment mechanism for a condenser tube and a digestion cup of a COD analysis instrument. Background Art

[0002] Chemical oxygen demand, or COD, is a key indicator in water quality measurement, used to reflect and characterize the degree of water pollution. The "Determination of Chemical Oxygen Demand in Water - Dichromate Method" (HJ 828-2017) is currently the primary method for monitoring COD in water bodies in my country, generating a significant amount of monitoring data nationwide annually. This method, a recognized standard, is widely used in water quality measurement.

[0003] Currently, some domestic laboratory chemical oxygen demand (COD) testing equipment faces the following technical challenges: the condenser tube on the reflux unit cannot automatically rise and fall to connect with the sample digestion cup, resulting in a low degree of automation and poor sealing. Furthermore, after the heating mechanism heats the sample solution in the digestion cup, the condenser tube and the sample digestion cup are difficult to separate. Solving these technical issues is a pressing need in the field of chemical laboratory instrument technology.

[0004] Therefore, a docking adjustment mechanism for a condenser tube and a digestion cup of a COD analyzer is proposed. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a docking adjustment mechanism for a condenser tube and a digestion cup of a COD analyzer.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A docking adjustment mechanism for a condenser tube and a digestion cup of a COD analyzer. The COD analyzer comprises an instrument frame, and a first support plate, a second support plate, and a heating plate spaced apart from top to bottom on the instrument frame; a first limiting step and a second limiting step are spaced apart on the condenser tube body; a third limiting step is provided near the opening of the digestion cup; the docking adjustment mechanism comprises a lifting mechanism provided on the instrument frame and a limiting mechanism provided on the second support plate, the first support plate being connected to the execution end of the lifting mechanism; and a fixing mechanism for fixing the condenser tube is provided on the first support plate.

[0008] Furthermore, in the present invention, the second support plate is provided with a through hole adapted to the digestion cup; the limiting mechanism includes a guide column connected to the second support plate, and a support plate, a first spring and a first limiting plate sequentially arranged on the guide column from top to bottom, and the central axis of the guide column is parallel to the central axis of the through hole; the support plate is slidably connected to the guide column and is located below the second support plate; one end of the first spring is connected to the support plate, and the other end is connected to the first limiting plate; through holes adapted to the digestion cup are provided on the support plate and the first limiting plate, and the central axes of the three through holes are collinear.

[0009] Furthermore, in the present invention, the diameter of the through hole on the supporting plate is smaller than the radial dimension of the third limiting step, and is greater than or equal to the outer diameter of the digestion cup.

[0010] Furthermore, in the present invention, the above-mentioned fixing mechanism includes a second spring and a second limiting plate located above the above-mentioned first support plate, and the above-mentioned second limiting plate is connected to the above-mentioned first support plate through a connecting rod; the above-mentioned first support plate and the above-mentioned second limiting plate are both provided with through holes adapted to the above-mentioned condenser tube, and the central axes of the two above-mentioned through holes are collinear with the central axes of the through holes on the above-mentioned second support plate; one end of the above-mentioned second spring is connected to the above-mentioned second limiting plate, and the other end abuts against the above-mentioned first limiting step; the above-mentioned second limiting step abuts against the above-mentioned first support plate.

[0011] Furthermore, in the present invention, the spring constant of the second spring is greater than the spring constant of the first spring.

[0012] Furthermore, in the present invention, the opening of the digestion cup is a spherical frosted opening; the opening of the condenser tube close to the digestion cup is a spherical smooth opening adapted to the spherical frosted opening.

[0013] Furthermore, in the present invention, a sealing ring is provided on the spherical smooth opening.

[0014] Furthermore, in the present invention, the lifting mechanism is a screw-nut mechanism.

[0015] The beneficial effects of the utility model are:

[0016] The utility model provides a docking adjustment mechanism for a condenser tube and a digestion cup of a COD analyzer. By installing a fixing mechanism on a first support plate and a limiting mechanism on a second support plate, the docking of the condenser tube and the digestion cup is facilitated. After heating, the lifting mechanism controls the first support plate to move upward, thereby separating the condenser tube from the digestion cup. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic structural diagram of an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 Left view of;

[0019] Figure 3 This is a schematic structural diagram of a digestion cup according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic structural diagram of a condenser according to an embodiment of the present utility model.

[0021] In the figure: 101-instrument frame; 201-first support plate; 301-second support plate; 401-heating plate; 501-condenser; 5011-first limiting step; 5012-second limiting step; 5013-water inlet; 5014-water outlet; 601-digestion cup; 6011-third limiting step; 701-lifting mechanism; 801-guide column; 802-support plate; 803-first spring; 804-first limiting plate; 901-second spring; 902-second limiting plate; 903-connecting rod; 1001-sealing ring. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0023] See also Figure 1-4 , the utility model provides a technical solution:

[0024] A docking adjustment mechanism for the condenser and digestion cup of a COD analyzer, the COD analyzer comprising an instrument frame 101, and a first support plate 201, a second support plate 301, and a heating plate 401 spaced apart from top to bottom on the instrument frame 101. The first support plate 201 is used to mount the condenser 501; the second support plate 301 is used to mount the digestion cup 601; and the heating plate 401 is used to heat the sample liquid in the digestion cup 601. In this embodiment, four condenser tubes 501 are mounted on the first support plate 201, corresponding to four digestion cups 601 mounted on the second support plate 301. In order to facilitate the lifting mechanism 701 to control the movement of the condenser tube 501 toward the digestion cup 601, a first limiting step 5011 and a second limiting step 5012 are spaced apart on the body of the condenser tube 501. The docking adjustment mechanism includes a lifting mechanism 701 mounted on the instrument frame 101 and a limiting mechanism mounted on the second support plate 301. The first support plate 201 is connected to the actuator end of the lifting mechanism 701. The first support plate 201 is equipped with a fixing mechanism for securing the condenser tube 501. To facilitate mounting the digestion cup 601 on the fixing mechanism, a third limiting step 6011 is provided near the cup's opening.

[0025] In this embodiment, a through hole adapted to the digestion cup 601 is provided on the second support plate 301; the limiting mechanism includes a guide column 801 connected to the second support plate 301, and a support plate 802, a first spring 803 and a first limiting plate 804 arranged on the guide column 801 from top to bottom, and the central axis of the guide column 801 is parallel to the central axis of the through hole; the support plate 802 is slidably connected to the guide column 801 and is located below the second support plate 301; one end of the first spring 803 is connected to the support plate 802, and the other end is connected to the first limiting plate 804; a through hole adapted to the digestion cup 601 is provided on both the support plate 802 and the first limiting plate 804, and the central axes of the three through holes are collinear.

[0026] from Figure 2 From the perspective of FIG, in this embodiment, the diameter of the through hole on the supporting plate 802 is smaller than the radial dimension of the third limiting step 6011 and is greater than or equal to the outer diameter of the digestion cup 601. Thus, when the digestion cup 601 is placed on the supporting plate 802, the presence of the third limiting step 6011 prevents the digestion cup 601 from falling.

[0027] In this embodiment, the fixing mechanism includes a second spring 901 and a second limiting plate 902 positioned above the first support plate 201. The second limiting plate 902 is connected to the first support plate 201 via a connecting rod 903. Both the first support plate 201 and the second limiting plate 902 are provided with through holes adapted for the condenser tube 501. The central axes of the two through holes are collinear with the central axis of the through hole in the second support plate 301. When the condenser tube 501 is vertically mounted on the first support plate 201, one end of the second spring 901 is connected to the second limiting plate 902, while the other end abuts the first limiting step 5011. The second limiting step 5012 abuts the first support plate 201.

[0028] In this embodiment, the spring constant of the second spring 901 is greater than that of the first spring 803. During condensation reflux, the condenser 501 is driven downward by the lifting mechanism 701. The sealing ring 1001 seals the spherical frosted opening. Continued downward movement indirectly compresses the first spring 803 until the digestion cup 601 and the heating plate 401 are in contact. As the downward movement continues, the second spring 901 is further compressed. The spring force corresponding to the compression of the second spring 901 minus the spring force corresponding to the compression of the first spring 803 equals the pressing force between the sealing ring 1001 and the spherical frosted opening (and also the pressing force between the digestion cup 601 and the heating plate 401). The second spring 901 not only ensures a seal between the sealing ring 1001 and the spherical frosted opening, but also acts as a buffer, preventing damage to the digestion sample cup and condenser 501.

[0029] In order to facilitate the sealed connection between the digestion cup 601 and the condenser 501, and to facilitate the separation of the two after the heating is completed, the opening of the digestion cup 601 in this embodiment is designed as a spherical frosted opening; the opening of the condenser 501 near the digestion cup 601 is designed as a spherical smooth opening adapted to the spherical frosted opening, and a sealing ring 1001 is provided on the spherical smooth opening. When the condensation reflux is completed, the condenser 501 is driven by the lifting mechanism 701 to move upward, and the compressed first spring 803 and second spring 901 are released. Since the sealing ring 1001 and the spherical frosted opening of the digestion cup 601 are sealed together and will not stick together (the frosted surface and the smooth surface will not stick together when the frosted surface and the frosted surface are sealed together; the frosted surface and the smooth surface will stick together when the smooth surface and the smooth surface are sealed together), when the upward movement continues, the condenser 501 and the digestion cup 601 are automatically separated.

[0030] After the condenser 501 is separated from the digestion cup 601, the support plate 802 moves upward for a distance under the elastic force of the first spring 803, thereby driving the bottom surface of the digestion cup 601 to separate from the heating plate 401, thereby accelerating the cooling of the sample solution in the digestion cup 601.

[0031] Condenser 501 is also provided with a water inlet 5013 and a water outlet 5014. The water inlet 5013 is located near the smooth spherical end, while the water outlet 5014 is located at the end away from the smooth spherical end. The water inlet 5013 and the water outlet 5014 are connected by a pipeline. A chiller is connected in series to the pipeline. The water inlet 5013 is connected to the chiller's water outlet 5014, and the water outlet 5014 is connected to the chiller's water inlet 5013. When multiple condensers 501 are running at the same time (applicable when the number is ≥2), connect the water outlet 5014 of the first condenser 501 to the water inlet 5013 of the second condenser 501, connect the water outlet 5014 of the second condenser 501 to the water inlet 5013 of the third condenser 501... connect all the condensers 501 in sequence, then connect the water inlet 5013 of the first condenser 501 to the water outlet 5014 of the chiller, and connect the water outlet 5014 of the last condenser 501 to the water inlet 5013 of the chiller.

[0032] After the sample liquid in digestion cup 601 is heated by heating plate 401, it generates water vapor at a certain temperature. The function of condenser 501 is to remove the heat from this water vapor. After the water vapor cools down in condenser 501, it liquefies and flows back into digestion cup 601. In this way, the volume of the sample liquid in digestion cup 601 does not decrease after being heated and boiled for a period of time.

[0033] In this embodiment, the lifting mechanism 701 is a screw-nut mechanism. In other implementations of this embodiment, the lifting mechanism 701 can also use a linear motion mechanism such as a linear motor and a hydraulic rod to control the lifting of the first support plate 201.

[0034] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A docking adjustment mechanism for a condenser tube and a digestion cup of a COD analyzer, the COD analyzer comprising an instrument frame (101), and a first support plate (201), a second support plate (301), and a heating plate (401) spaced apart from top to bottom on the instrument frame (101); a first limiting step (5011) and a second limiting step (5012) are spaced apart on the tube body of the condenser tube (501); a third limiting step (6011) is provided near the opening of the digestion cup (601); and the invention is characterized in that: include: A lifting mechanism (701) is provided on the instrument frame (101), and the first support plate (201) is connected to the execution end of the lifting mechanism (701); a fixing mechanism for fixing the condenser tube (501) is provided on the first support plate (201); A limiting mechanism is provided on the second supporting plate (301).

2. The docking adjustment mechanism for the condenser tube and the digestion cup of a COD analyzer according to claim 1, characterized in that: The second support plate (301) is provided with a through hole adapted to the digestion cup (601); and the limiting mechanism is arranged below the second support plate (301).

3. The docking adjustment mechanism for the condenser tube and the digestion cup of a COD analyzer according to claim 2, characterized in that: The limiting mechanism includes a guide column (801) connected to the second support plate (301), and a support plate (802), a first spring (803) and a first limiting plate (804) arranged on the guide column (801) from top to bottom, the central axis of the guide column (801) is parallel to the central axis of the through hole; the support plate (802) is slidably connected to the guide column (801) and is located below the second support plate (301); one end of the first spring (803) is connected to the support plate (802), and the other end is connected to the first limiting plate (804); a through hole adapted to the digestion cup (601) is provided on the support plate (802) and the first limiting plate (804), and the central axes of the three through holes are collinear.

4. The docking adjustment mechanism for the condenser tube and the digestion cup of a COD analyzer according to claim 3, characterized in that: The diameter of the through hole on the supporting plate (802) is smaller than the radial dimension of the third limiting step (6011), and is greater than or equal to the outer diameter of the digestion cup (601).

5. The docking adjustment mechanism for the condenser tube and the digestion cup of a COD analyzer according to claim 3, characterized in that: The fixing mechanism comprises a second spring (901) and a second limiting plate (902) located above the first support plate (201), the second limiting plate (902) being connected to the first support plate (201) via a connecting rod (903); a through hole adapted to the condenser tube (501) is provided on both the first support plate (201) and the second limiting plate (902), the central axes of the two through holes being collinear with the central axis of the through hole on the second support plate (301); one end of the second spring (901) is connected to the second limiting plate (902), and the other end abuts against the first limiting step (5011); the second limiting step (5012) abuts against the first support plate (201).

6. The docking adjustment mechanism for the condenser tube and the digestion cup of the COD analyzer according to claim 5, characterized in that: The spring constant of the second spring (901) is greater than the spring constant of the first spring (803).

7. The docking adjustment mechanism for the condenser tube and the digestion cup of a COD analyzer according to claim 5, characterized in that: The opening of the digestion cup (601) is a spherical frosted opening; the opening of the condenser (501) close to the digestion cup (601) is a spherical smooth opening adapted to the spherical frosted opening.

8. The docking adjustment mechanism for the condenser tube and the digestion cup of a COD analyzer according to claim 7, characterized in that: A sealing ring (1001) is provided on the spherical smooth opening.

9. The docking adjustment mechanism for the condenser tube and the digestion cup of a COD analyzer according to claim 1, characterized in that: The lifting mechanism (701) is a screw-nut mechanism.

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