Pretreatment device suitable for water bath digestion of mercury in water

Abstract

The utility model relates to the field of environment detection, in particular to a pretreatment device suitable for water bath digestion of mercury in water, which comprises a water bath kettle, a pinch plate arranged on the water bath kettle, a heating hole arranged on the surface of the pinch plate, a colorimetric tube arranged in the heating hole, an external thread arranged on the surface of the top end of the colorimetric tube, and an internal thread arranged on the surface of the top end of the colorimetric tube. The external thread is in threaded connection with a first sealing cover, the first sealing cover is of a U-shaped structure, and an internal thread is arranged on the inner side wall of the bottom end of the first sealing cover and is in threaded connection with the external thread; according to the pretreatment device for water bath digestion of mercury in water, the conical vent hole is formed, the sealing structure and the anti-rebound structure can better seal the vent hole, meanwhile, concentrated exhaust can be achieved through the conical vent hole, mercury loss is reduced, and the colorimetric tube can be rapidly and stably heated through the pinch plate; and the second sealing cover can be directly placed in the heating hole for heating, so that the working efficiency and the detection accuracy are improved, and the scalding condition caused by direct contact with the second sealing cover can be effectively avoided through the buckling block.

Description

Technical Field

[0001] This utility model relates to the field of environmental testing technology, specifically a pretreatment device suitable for mercury water bath digestion in water. Background Technology

[0002] Mercury is silvery-white in appearance and has the lowest melting and boiling points among known metals. It is highly volatile, its vapor is toxic, and it is easily absorbed by the human body, accumulating rapidly and causing significant harm to organisms. Mercury pollution in water bodies may originate from byproducts of metal smelting, laboratory scientific research, electroplating, and coal combustion processes. It is classified as a Class I pollutant. The state has established a series of standards and regulations for the emission and determination of mercury. According to the "Determination of Mercury, Arsenic, Selenium, Bismuth and Antimony in Water by Atomic Fluorescence Method" (HJ694-2014), in the mercury pretreatment process, a certain volume of sample is added to a 10 mL colorimetric tube (4), followed by 1 mL of hydrochloric acid-nitric acid solution. The tube is then stoppered and mixed thoroughly. The tube is placed in a boiling water bath for digestion for 1 hour, shaking 1-2 times and releasing gas during this period. After cooling, the sample is diluted to the mark with water, mixed thoroughly, and ready for analysis. Existing colorimetric tubes lack a removable and easily venting structure. The tube ends are typically sealed with stoppers. When the liquid inside reaches a certain temperature, the stopper easily pops open, potentially breaking upon impact with the glass bottle. Furthermore, removing the stopper completely to vent the gas after the temperature rises can lead to sample loss and inaccurate results. Additionally, the internal steam continuously heats the stopper during removal, posing a risk of burns to the operator's hands due to the high stopper temperature. Moreover, existing water baths (two-hole, double-row four-hole, double-row six-hole, double-row eight-hole) cannot directly place 10mL colorimetric tubes in the water bath. Typically, the top plate of the existing water bath is removed, and a colorimetric tube holder is used to secure the tubes before placing them in the water bath for heating. However, prolonged immersion of the colorimetric tube holder in hot water can damage it and cause uneven heating, affecting the accuracy of the results. Summary of the Invention

[0003] The main purpose of this invention is to solve the above-mentioned existing technical problems and provide a pretreatment device suitable for mercury water bath digestion in water.

[0004] The specific solution of this utility model is: a pretreatment device suitable for water bath digestion of mercury in water, including a water bath, a mounting plate installed on the water bath, heating holes on the surface of the mounting plate, a colorimetric tube placed in the heating holes, the heating holes matching the size of the colorimetric tube, an external thread on the top surface of the colorimetric tube, a first sealing cap threaded to the external thread, the first sealing cap having a U-shaped structure, an internal thread on the inner side wall of the bottom end of the first sealing cap, the internal thread being threaded to the external thread, a vent hole at the top of the first sealing cap, and the lower end of the vent hole communicating with the colorimetric tube. The vent hole has a conical structure. A second sealing cap is hinged to the first sealing cap. The bottom of the second sealing cap has a sealing structure. The sealing structure includes a first sealing plug, which matches the size of the vent hole. The surface of the first sealing plug is covered with a second sealing plug. The interior of the second sealing plug is filled with a soft, elastic filler. When the second sealing plug is squeezed, it moves downward along the vent hole. When the sealing structure is inside the vent hole, the vent hole cannot release air. An anti-rebound structure is installed on the first sealing cap. The anti-rebound structure is used to prevent the sealing structure from being squeezed out due to excessive air pressure inside the colorimetric tube.

[0005] According to the above technical solution, the conical vent hole makes the steam discharge direction more concentrated, and the small-diameter exhaust also reduces the loss of internal mercury. The vent hole port is sealed by the first sealing plug, and the second sealing plug expands inside the vent hole to further seal it. The anti-rebound structure can continuously apply pressure to the second sealing plug, making its seal more stable.

[0006] Furthermore, the anti-rebound structure includes a relief groove at one end of the first sealing cover, a fixed shaft installed in the relief groove, a movable plate rotatably mounted on the surface of the fixed shaft, and the other end of the movable plate connected to the end of the second sealing cover, so that the second sealing cover can be flipped over by the movable plate. A torsion spring is fitted on the surface of the fixed shaft, one end of the torsion spring is connected to the movable plate, and the other end of the torsion spring is connected to the bottom end of the relief groove. When the second sealing cover flips outward, it drives the movable plate to compress the torsion spring to perform an elastic storage motion.

[0007] According to the above technical solution, the second sealing cover can be flipped by rotating the movable plate on the fixed shaft, and the torsion spring is squeezed at the same time, so that pressure can be applied to the second sealing cover during sealing to improve the sealing effect.

[0008] Furthermore, the soft filler is made of sponge, the first and second sealing plugs are made of elastic rubber, and the buckle is made of stainless steel.

[0009] According to the above technical solution, the sponge material allows the second sealing plug to reduce its diameter when squeezed so that it can pass through the vent hole smoothly, and the stainless steel material of the buckle plate prevents corrosion.

[0010] Furthermore, the second sealing plug is elliptical in shape, and the maximum diameter of the second sealing plug is larger than the diameter of the vent hole.

[0011] According to the above technical solution, the elliptical shape allows it to be better inserted into the vent hole, and the expansion at its maximum diameter can better seal the vent hole.

[0012] Furthermore, the second sealing cover is provided with a buckle at the top, and the end of the buckle away from the movable end of the second sealing cover is inclined upward.

[0013] According to the above technical solution, by tilting one end of the buckle upward, the heat transfer of the second sealing cover is avoided, which reduces the temperature of one end of the buckle. At the same time, the upward tilt makes it easier to open and does not burn the hand.

[0014] Furthermore, the buckle is made of heat-insulating material.

[0015] According to the above technical solution, the impact of steam heat on the buckle is further reduced by the use of heat insulation materials, making it more comfortable to open the second sealing cover.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The pretreatment device for mercury water bath digestion in water is equipped with a conical vent, a sealing structure and an anti-rebound structure. The conical vent can centrally discharge the internal steam, and the small hole design can effectively reduce mercury loss, thereby improving the accuracy of the detection data. At the same time, the sealing structure can better double seal the vent, reducing the possibility of leakage during heating. Furthermore, the anti-rebound structure can continuously apply pressure to the second sealing cap, so that the sealing structure will not be pushed out when the internal temperature continues to rise, further improving the sealing effect, thereby avoiding the situation where the traditional stopper breaks the colorimetric tube.

[0017] 2. This pretreatment device for mercury digestion in water improves work efficiency by replacing the cover plate of the water bath with a heating hole that matches the diameter of the colorimetric tubes. This avoids the need to place the entire colorimetric tube rack into the water bath for heating, thus ensuring the accuracy of the sample pretreatment process. 3. The pretreatment device for mercury digestion in water is equipped with a cover plate made of heat-insulating material, which can effectively prevent burns to the hands when opening the second sealing cover, thus improving work safety. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0019] Figure 2 This is a plan view of the buckle plate structure of this utility model;

[0020] Figure 3This is a schematic diagram of the second sealing cover of this utility model in its unfolded state;

[0021] Figure 4 This is a front view of the overall structure of the colorimetric tube of this utility model;

[0022] Figure 5 yes Figure 4 View at AA;

[0023] Figure 6 yes Figure 5 Enlarged view of the structure at point B;

[0024] Figure 7 This is a schematic diagram of the colorimetric tube of this utility model with the first sealing cap removed;

[0025] Figure 8 yes Figure 5 The right view;

[0026] Figure 9 yes Figure 8 Enlarged view of the structure at point C;

[0027] In the diagram: 1. Water bath; 2. Cover plate; 3. Heating hole; 4. Colorimetric tube; 5. First sealing cover; 6. Vent hole; 7. Second sealing cover; 8. First sealing plug; 9. Second sealing plug; 10. Soft elastic filler; 11. Relief groove; 12. Fixed shaft; 13. Movable plate; 14. Torsion spring; 15. Fastener block. Detailed Implementation

[0028] See Figure 1-9This embodiment describes a pretreatment device suitable for mercury water bath digestion in water. It should be noted that the water bath 1 is a readily available and mature product that can be purchased directly. The water bath 1 is rectangular with an open top and a hollow center. A mounting plate 2 is placed on the top of the water bath 1, with a heating hole 3 perforated on its surface. A colorimetric tube 4 passes through the heating hole 3. The heating hole 3 and the colorimetric tube 4 are sized to match; the diameter of the heating hole 3 is 17mm, while the colorimetric tube 4 is 10ml, ensuring that the colorimetric tube 4 fits snugly within the heating hole 3 without easily shifting. The top surface of the colorimetric tube 4 has external threads, which are threaded to a first sealing cap 5. The first sealing cap 5 has a U-shaped structure, and its bottom inner wall has internal threads. The threaded connection between the internal and external threads improves the ease of use by connecting the first sealing cap 5 to the colorimetric tube 4. The top of the first sealing cap 5 has a vent hole 6, and the lower end of the vent hole 6 is connected to the colorimetric tube 4, allowing air to pass through. The conical structure of the hole 6 ensures stable and concentrated steam discharge. A second sealing cover 7 is hinged to the first sealing cover 5. The bottom of the second sealing cover 7 has a sealing structure for sealing the vent hole 6. The sealing structure includes a first sealing plug 8, which matches the size of the vent hole 6. The surface of the first sealing plug 8 is covered with a second sealing plug 9, which is elliptical in shape to facilitate insertion into the vent hole 6. The maximum diameter of the second sealing plug 9 is larger than the diameter of the vent hole 6, while the diameters at both ends are smaller than the diameter of the vent hole 6, making it easier to insert into the vent hole 6. The second sealing plug 9 is filled with a soft, elastic filler 10. When the second sealing plug 9 is squeezed, it moves downward along the vent hole 6. When the sealing structure is inside the vent hole 6, the vent hole 6 cannot release air. An anti-rebound structure is installed on the first sealing cover 5 to prevent excessive air pressure in the colorimetric tube 4 from squeezing out the sealing structure and causing leakage.

[0029] Furthermore, the anti-rebound structure includes a relief groove 11 located at one end of the first sealing cover 5. A fixed shaft 12 is fixedly installed in the relief groove 11. A movable plate 13 is rotatably installed on the surface of the fixed shaft 12. The other end of the movable plate 13 is connected to the end of the second sealing cover 7, so that the second sealing cover 7 can be flipped through the movable plate 13. A torsion spring 14 is fitted on the surface of the fixed shaft 12. One end of the torsion spring 14 is connected to the movable plate 13, and the other end of the torsion spring 14 is connected to the bottom end of the relief groove 11. When the second sealing cover 7 flips outward, it drives the movable plate 13 to rotate. The movable plate 13 presses the torsion spring 14 to one side to make it perform an elastic storage movement. When the exhaust is completed, the second sealing cover 7 can be released. The torsion spring 14 then performs an elastic movement to continuously apply pressure to the movable plate 13, so that the second sealing cover 7 continuously applies downward pressure, improving the sealing effect of the vent hole 6.

[0030] Furthermore, the soft filler is made of sponge, the first sealing plug 8 and the second sealing plug 9 are made of elastic rubber, and the buckle plate 2 is made of stainless steel. The sponge material has plasticity and elasticity, which allows it to deform and enter smoothly when it enters the vent hole 6. Then, it expands elastically to block the vent hole 6. The elastic rubber material has elasticity and plasticity, which allows it to better seal the vent hole 6. The stainless steel material increases the service life and avoids corrosion.

[0031] Furthermore, the second sealing plug 9 is elliptical in shape, and its maximum diameter is larger than that of the vent hole 6, so that it can better seal the vent hole 6 when it expands after entering the vent hole 6.

[0032] Furthermore, a latch 15 is fixedly installed on the top of the second sealing cover 7. The end of the latch 15 away from the movable end of the second sealing cover 7 is tilted upward, that is, away from the fixed shaft 12. This improves the convenience for the operator to pry open the second sealing cover 7 and also reduces the temperature of the latch 15 end, thus improving the comfort of use.

[0033] Furthermore, the buckle 15 is made of heat-insulating material, which further reduces the temperature of the buckle 15 and prevents operators from burning their hands when opening the second sealing cover 7.

[0034] The working principle of this embodiment is as follows: In use, first place the buckle plate 2 on the water bath 1, then place the colorimetric tube 4 to be heated into the heating hole 3 for fixed heating. When opening the cover to release gas, manually hold the buckle block 15 upwards, causing the second sealing cover 7 to rotate on the fixed shaft 12 via the movable plate 13, thus flipping the second sealing cover 7. When the movable plate 13 rotates, it squeezes the torsion spring 14 to one side, causing it to perform an elastic storage movement. When the sealing structure disengages from the vent hole 6, the internal steam can be concentrated and discharged through the vent hole 6. After the gas release is complete, press the buckle plate 2 downwards to separate the first sealing plug 8 from the second sealing plug 14. The second sealing plug 9 enters the vent hole 6 to complete the seal. When the second sealing plug 9 is squeezed by the vent hole 6, the internal sponge elastically deforms and smoothly enters the vent hole 6. When the second sealing plug 9 is in the vent hole 6, as the diameter of the conical vent hole 6 gradually increases, the sponge elastically deforms again and expands to both sides, causing the second sealing plug 9 to block the vent hole 6, further improving the sealing effect. At the same time, the torsion spring 14 continuously squeezes the movable plate 13 inward, so that the second sealing cover 7 is subjected to continuous downward pressure, preventing the internal steam from opening the second sealing cover 7 and causing leakage, thus reducing the occurrence of mercury leakage.

Claims

1. A pretreatment device suitable for water bath digestion of mercury in water, comprising a water bath, wherein a mounting plate is installed on the water bath, the surface of the mounting plate is provided with heating holes, and a colorimetric tube is placed in the heating holes, characterized in that: The heating hole is matched to the size of the colorimetric tube. The top surface of the colorimetric tube is provided with an external thread, which is threaded to a first sealing cap. The first sealing cap has a U-shaped structure. The inner side wall of the bottom end of the first sealing cap is provided with an internal thread, which is threaded to the external thread. The top of the first sealing cap is provided with a vent hole, and the lower end of the vent hole is connected to the colorimetric tube. The vent hole has a conical structure. A second sealing cap is hinged to the first sealing cap. The bottom of the second sealing cap is provided with a sealing structure. The sealing structure includes a first sealing plug, which is matched to the size of the vent hole. The surface of the first sealing plug is covered with a second sealing plug. The interior of the second sealing plug is filled with a soft elastic filler. When the second sealing plug is squeezed, it moves downward along the vent hole. When the sealing structure is inside the vent hole, the vent hole cannot release air. An anti-rebound structure is installed on the first sealing cap. The anti-rebound structure is used to prevent the sealing structure from being squeezed out due to excessive air pressure inside the colorimetric tube.

2. The pretreatment device for mercury water bath digestion in water according to claim 1, characterized in that: The anti-rebound structure includes a relief groove at one end of the first sealing cover, a fixed shaft installed in the relief groove, a movable plate rotatably mounted on the surface of the fixed shaft, and the other end of the movable plate connected to the end of the second sealing cover, so that the second sealing cover can be flipped over by the movable plate. A torsion spring is fitted on the surface of the fixed shaft, one end of the torsion spring is connected to the movable plate, and the other end of the torsion spring is connected to the bottom end of the relief groove. When the second sealing cover flips outward, it drives the movable plate to compress the torsion spring to perform an elastic storage motion.

3. A pretreatment device suitable for mercury water bath digestion in water according to claim 1 or 2, characterized in that: The soft, elastic filler is made of sponge, the first and second sealing plugs are made of elastic rubber, and the buckle is made of stainless steel.

4. A pretreatment apparatus suitable for mercury water bath digestion in water according to claim 1 or 2, characterized in that: The second sealing plug is elliptical in shape, and the maximum diameter of the second sealing plug is larger than the diameter of the vent hole.

5. A pretreatment apparatus suitable for mercury water bath digestion in water according to claim 1 or 2, characterized in that: The second sealing cover has a latching block on top, and the end of the latching block away from the movable end of the second sealing cover is inclined upward.

6. A pretreatment device for mercury water bath digestion in water according to claim 5, characterized in that: The buckle is made of heat-insulating material.

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