Digestion sample cup and heat source separation mechanism for COD (Chemical Oxygen Demand) analysis instrument

Abstract

The utility model discloses a digestion sample cup and heat source separation mechanism for 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, a supporting plate and a heating plate; a limiting ring is arranged on a cup body of the digestion sample cup; a downward pressing mechanism is arranged on the instrument framework and enables the bottom of the digestion sample cup to be attached to the heating plate during heating; a first through hole matched with the limiting ring is formed in the supporting plate; a separation mechanism detachably connected with the digestion sample cup is positioned between the supporting plate and the heating plate. The pressing mechanism and the separating mechanism are installed on the instrument framework, when sample water in the digestion sample cup needs to be heated, the pressing mechanism controls the digestion sample cup to move towards the heating plate till the bottom of the digestion sample cup is attached to the heating plate, and then heating is conducted. After heating is completed, the pressing mechanism moves upwards, and in the process, the digestion sample cup automatically moves upwards under the action of the separation mechanism, so that the digestion sample cup is separated from the heating plate.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical experimental instruments, in particular to a mechanism for separating a digestion sample cup and a heat source used in 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" (HJ828-2017) 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] When analyzing a water sample, one of the steps is heating the sample. Conventional heating typically involves pouring the sample water into a digestion sample cup, which is then placed on a heating plate for heating. After heating (digestion), the sample water needs to be cooled quickly. Disconnecting the digestion sample cup from the heat source after digestion improves cooling efficiency.

[0004] Some existing devices separate the digestion sample cup from the heat source by moving the heat source (heating module) downward. While this separation method improves the cooling efficiency of the digestion sample water, the heat source is generally large, and designing a dedicated movement mechanism for this purpose would increase manufacturing costs.

[0005] Therefore, a mechanism for separating a digestion sample cup from a heat source for a COD analyzer is proposed. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a mechanism for separating a digestion sample cup from a heat source for a COD analysis instrument.

[0007] The purpose of this utility model is achieved through the following technical solutions:

[0008] A digestion sample cup and heat source separation mechanism for a COD analyzer, the COD analyzer comprising an instrument frame, and a support plate and a heating plate spaced apart from top to bottom on the instrument frame; a limit ring is provided on the body of the digestion sample cup near its opening; a downward pressing mechanism is provided on the instrument frame, and during heating, the downward pressing mechanism causes the bottom of the digestion sample cup to fit against the heating plate; a first through hole is provided on the support plate, which is adapted to the limit ring; and the separation mechanism, which is detachably connected to the digestion sample cup, is located between the support plate and the heating plate.

[0009] Furthermore, in the present invention, the above-mentioned disengagement mechanism includes a guide shaft connected to the above-mentioned support plate, and a support plate, a spring and a limit plate arranged on the above-mentioned guide shaft from top to bottom, and the central axis of the above-mentioned guide shaft is parallel to the central axis of the above-mentioned first through hole; the above-mentioned support plate is slidably connected to the above-mentioned guide shaft and is located below the above-mentioned support plate; one end of the above-mentioned spring is connected to the above-mentioned support plate, and the other end is connected to the above-mentioned limit plate; a second through hole with a diameter smaller than the diameter of the above-mentioned limit ring is provided on the above-mentioned support plate, and the diameter of the above-mentioned second through hole is greater than or equal to the outer diameter of the above-mentioned digestion sample cup; a third through hole adapted to the above-mentioned digestion sample cup is provided on the above-mentioned limit plate.

[0010] Furthermore, in the present invention, the central axis of the second through hole and the central axis of the third through hole are both collinear with the central axis of the first through hole, and the diameter of the second through hole is greater than or equal to the outer diameter of the digestion sample cup.

[0011] Furthermore, in the present invention, the above-mentioned downward pressure mechanism includes a lifting mechanism arranged on the above-mentioned instrument frame, a mounting plate connected to the execution end of the above-mentioned lifting mechanism, and a condenser arranged on the above-mentioned mounting plate; the above-mentioned mounting plate is always located above the above-mentioned support plate; the central axis of the above-mentioned condenser is collinear with the central axis of the above-mentioned first through hole.

[0012] Furthermore, in the present invention, the lifting mechanism is a screw-nut mechanism.

[0013] The beneficial effects of the utility model are:

[0014] The utility model provides a mechanism for separating a digestion sample cup from a heat source for a COD analyzer. A pressing mechanism and a separating mechanism are installed on the instrument frame. When the sample water in the digestion sample cup needs to be heated, the pressing mechanism controls the digestion sample cup to move toward a heating plate until the bottom of the digestion sample cup abuts against the heating plate, and then heating is performed. After heating is completed, the pressing mechanism moves upward. During this process, the digestion sample cup automatically moves upward under the action of the separating mechanism, and is separated from the heating plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0016] Figure 2 This is a cross-sectional view of the disengagement mechanism according to an embodiment of the present invention.

[0017] In the figure: 101 - instrument frame; 201 - support plate; 301 - heating plate; 401 - digestion sample cup; 4011 - limiting ring; 501 - guide shaft; 502 - support plate; 503 - spring; 504 - limiting plate; 601 - lifting mechanism; 602 - mounting plate; 603 - condenser. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1 and Figure 2 , the utility model provides a technical solution:

[0020] A mechanism for separating a digestion sample cup from a heat source for a COD analyzer is disclosed. The COD analyzer comprises an instrument frame 101, a support plate 201, and a heating plate 301 spaced apart from top to bottom on the frame 101. A limit ring 4011 is provided on the body of the digestion sample cup 401 near its opening. The digestion sample cup 401 contains a certain volume of sample liquid. When the sample liquid is heated using the heating plate 301, the bottom of the digestion sample cup 401 must always be in contact with the heating plate 301. Therefore, a downward pressure mechanism is installed on the instrument frame 101 to keep the bottom of the digestion sample cup 401 in contact with the heating plate 301 during heating.

[0021] To facilitate placement of the digestion sample cup 401, the support plate 201 is provided with a first through-hole adapted to fit within the retaining ring 4011. The diameter of the first through-hole may be slightly larger than that of the retaining ring 4011. A detachable mechanism for detachably connecting the digestion sample cup 401 is located between the support plate 201 and the heating plate 301.

[0022] Specifically, in this embodiment, the disengagement mechanism includes a guide shaft 501 connected to the support plate 201, and a support plate 502, a spring 503, and a stop plate 504 arranged on the guide shaft 501 from top to bottom. The central axis of the guide shaft 501 is parallel to the central axis of the first through hole. The support plate 502 is slidably connected to the guide shaft 501 and is located below the support plate 201. One end of the spring 503 is connected to the support plate 502 and the other end is connected to the stop plate 504. The support plate 502 has a second through hole with a diameter smaller than the diameter of the stop ring 4011, and the diameter of the second through hole is greater than or equal to the outer diameter of the digestion sample cup 401. The stop plate 504 has a third through hole adapted to the digestion sample cup 401. Thus, when the digestion sample cup 401 is placed on the support plate 502, the stop ring 4011 on the digestion sample cup 401 prevents it from falling. Sample water is then injected into the digestion sample cup 401.

[0023] from Figure 1From a 3D perspective, after the sample water is added, the downward pressure mechanism is operated to move the digestion sample cup 401 toward the heating plate 301 until the bottom of the digestion sample cup 401 contacts the heating plate 301. During this process, the spring 503 is gradually compressed. When heating is complete, the downward pressure mechanism moves upward. During this process, the digestion sample cup 401 automatically moves upward under the action of the spring 503, and then disengages from the heating plate 301.

[0024] In this embodiment, the central axis of the second through hole and the central axis of the third through hole are both collinear with the central axis of the first through hole, and the diameter of the second through hole is greater than or equal to the outer diameter of the digestion sample cup 401. When the diameter of the second through hole is the same as the outer diameter of the digestion sample cup 401, when the digestion sample cup 401 is placed in the second through hole, the second through hole can limit the radial displacement of the digestion sample cup 401 and prevent it from tilting.

[0025] Specifically, in this embodiment, the downward pressure mechanism includes a lifting mechanism 601 arranged on the instrument frame 101, a mounting plate 602 connected to the execution end of the lifting mechanism 601, and a condenser 603 arranged on the mounting plate 602; the mounting plate 602 is always located above the support plate 201; the central axis of the condenser 603 is collinear with the central axis of the first through hole.

[0026] from Figure 1 From a 3D perspective, the lifting mechanism 601 controls the downward movement of the mounting plate 602, driving the condenser 603 downward in tandem. When the lower end of the condenser 603 contacts the opening of the digestion sample cup 401, it continues to move downward until the bottom of the digestion sample cup 401 rests against the heating plate 301.

[0027] After the sample water in digestion sample cup 401 is heated by heating plate 301, it generates water vapor at a certain temperature. Another function of condenser 603 is to remove the heat from this water vapor. After cooling through condenser 603, the water vapor liquefies and flows back into digestion sample cup 401. This ensures that the volume of the sample water in digestion sample cup 401 does not decrease after being heated and boiled for a period of time. The operating principle of condenser 603 is conventional and will not be elaborated on here.

[0028] In this embodiment, the lifting mechanism 601 is a screw-nut mechanism. In other implementations of this embodiment, the lifting mechanism 601 can also use a linear motion mechanism such as a linear motor and a hydraulic rod to control the lifting of the mounting plate 602.

[0029] 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 digestion sample cup and heat source separation mechanism for a COD analysis instrument, the COD analysis instrument comprising an instrument frame (101), and a support plate (201) and a heating plate (301) spaced apart from top to bottom on the instrument frame (101); a limiting ring (4011) is provided on the body of the digestion sample cup (401) near its opening; the characteristics include: The instrument frame (101) is provided with a downward pressing mechanism, which makes the bottom of the digestion sample cup (401) fit against the heating plate (301) during heating; The support plate (201) is provided with a first through hole adapted to the limiting ring (4011); the detachment mechanism detachably connected to the digestion sample cup (401) is located between the support plate (201) and the heating plate (301).

2. The mechanism for separating a digestion sample cup from a heat source for a COD analyzer according to claim 1, characterized in that: The disengagement mechanism comprises a guide shaft (501) connected to the support plate (201), and a support plate (502), a spring (503) and a limit plate (504) sequentially arranged on the guide shaft (501) from top to bottom, wherein the central axis of the guide shaft (501) is parallel to the central axis of the first through hole; the support plate (502) is slidably connected to the guide shaft (501) and is located below the support plate (201); one end of the spring (503) is connected to the support plate (502), and the other end is connected to the limit plate (504); a second through hole having a diameter smaller than that of the limit ring (4011) is provided on the support plate (502), and the diameter of the second through hole is greater than or equal to the outer diameter of the digestion sample cup (401); and a third through hole adapted to the digestion sample cup (401) is provided on the limit plate (504).

3. The mechanism for separating the digestion sample cup from the heat source for a COD analyzer according to claim 2, characterized in that: The central axis of the second through hole and the central axis of the third through hole are both collinear with the central axis of the first through hole, and the diameter of the second through hole is greater than or equal to the outer diameter of the digestion sample cup (401).

4. The mechanism for separating the digestion sample cup from the heat source for a COD analyzer according to claim 2, characterized in that: The pressing mechanism includes a lifting mechanism (601) arranged on the instrument frame (101), a mounting plate (602) connected to the execution end of the lifting mechanism (601), and a condensing tube (603) arranged on the mounting plate (602); the mounting plate (602) is always located above the supporting plate (201); the central axis of the condensing tube (603) is collinear with the central axis of the first through hole.

5. The mechanism for separating the digestion sample cup from the heat source for a COD analyzer according to claim 4, characterized in that: The lifting mechanism (601) is a screw-nut mechanism.

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