A titration assembly and digestion titration device

Abstract

This invention discloses a titration assembly and a digestion titration device, belonging to the field of analytical testing technology. The device mounts the open end of the digestion tube onto a sealing element, and a titration port connecting the digestion tube is formed on the side of the sealing element. The burette can be inserted into the titration port for titration. A rotating cap is rotatably mounted on the side of the sealing element forming the titration port. The rotating cap has a sealing end for sealing the titration port and a driving end for being driven by external force. The rotation axis of the rotating cap is parallel to the side of the sealing element forming the titration port, thereby ensuring that gas in the digestion tube will not escape from the titration port during subsequent experiments, thus ensuring the safety of the test personnel, the integrity of the equipment, and the accuracy of the test results. Simultaneously, the rotating cap is rotatably mounted on the side of the sealing element. When the digestion tube is heated, the thermal expansion of the sealing element and the rotating cap will not affect the normal operation of the rotating cap, preventing the rotating cap from becoming immobile due to thermal expansion, ensuring that the titration port can be opened normally for titration.

Description

Technical Field

[0001] This invention relates to the field of analytical testing technology, specifically to a titration component and a digestion titration apparatus. Background Technology

[0002] A digestion titration apparatus is a system that integrates two independent chemical analysis steps, "digestion" and "titration," and is used to determine the content of certain substances in a sample that are difficult to measure directly. The purpose of digestion is to completely decompose and oxidize the analyte in the sample through strong chemical reagents and high-temperature heating, transforming it into a simple form that is easy to measure; Titration, on the other hand, involves adding a reagent of known precise concentration (titrant) to a digested solution until the chemical reaction is complete. The content of the analyte is then calculated by measuring the volume of titrant consumed.

[0003] Traditionally, during titration, the digestion tube needs to be opened manually. The solution inside the digestion tube is often a dangerous or toxic liquid, and after heating, it can easily cause harm to the experimenters. Chinese invention patent CN118566524B discloses a magnetic automatic opening and closing mixing titration device. It features a sealing cap fixed to the opening of a digestion bottle, with a magnetic switch sliding on the cap. The cap is opened or closed by moving the magnetic switch back and forth. Specifically, the titration assembly's mounting bracket is fixedly connected to the lower end of a moving block, located between the burette and the telescopic cylinder, and contains four magnetic blocks. When the moving block moves downwards, it pulls the burette along with it. The two upper magnetic blocks move downwards and approach the magnetic switch. Since the magnetic poles of the upper magnetic blocks and the magnetic switch are opposite, the magnetic switch and the magnetic blocks attract each other. The magnetic switch moves forward to the blocking block, the sealing cap is opened, and the burette is placed inside the sealing cap, starting the titration operation. After the titration is completed, the moving block moves upwards, the burette leaves the sealing cap, and the two lower magnetic blocks approach the magnetic switch. Since the magnetic poles of the lower magnetic blocks and the magnetic switch are the same, the magnetic switch moves backwards, and the sealing cap is closed. This achieves the opening and closing of the sealing cap by the magnetic switch. However, because the magnetic switch is slidably mounted on the top surface of the sealing cap, a sliding gap is required between the magnetic switch and the top surface of the sealing cap. This means that vapor generated during the heating process of the digestion tube may escape into the environment from between the sealing cap and the magnetic switch. This not only affects the accuracy of the test results but may also pose a health hazard to the test personnel (e.g., inhalation may compromise safety) and shorten the lifespan of the equipment. Furthermore, over long-term use, wear may occur between the magnetic switch and the top surface of the sealing cap, further reducing the sealing effect. Simultaneously, the heating process of the digestion tube may cause the sealing cap or magnetic switch to expand due to heat. This increases the friction between the sealing cap and the magnetic switch, potentially preventing the magnetic block from properly driving the magnetic switch to move, thus hindering the titration process.

[0004] Based on this, the present invention designs a titration component and a digestion titration device to solve the above problems. Summary of the Invention

[0005] This invention provides a titration component and a digestion titration device to solve the technical problems of poor sealing effect of digestion tube and the inability to open the digestion tube after heating in the prior art.

[0006] According to one aspect of the present invention, a titration assembly is provided, comprising a digestion tube, a cover unit, a burette, and a capping unit; the cover unit includes a sealing element, a rotating cap, and an elastic reset element; the sealing element is installed at the open end of the digestion tube to close the opening of the digestion tube, a titration port is formed on the side of the sealing element, the inner end of the titration port communicates with the inner cavity of the digestion tube, and the rotating cap is rotatably disposed on the side of the sealing element forming the titration port via a rotating shaft, and the rotating shaft of the rotating cap is parallel to the side of the sealing element forming the titration port. The cover includes a sealing end located on the first side of the rotating shaft and a driving end located on the second side of the rotating shaft. The sealing end is used to abut against the side of the sealing element and seal the titration port. The driving end is used to be driven by an external force to rotate the sealing end around the rotating shaft away from the titration port. The elastic reset element is provided on the rotating cover and is used to maintain the sealing state of the sealing end to the titration port. The opening unit is used to push the driving end to rotate so that the sealing end moves away from the titration port. The burette is used to be inserted into the titration port to perform titration when the sealing end of the rotating cover moves away from the titration port.

[0007] As a further aspect of the present invention, the side of the sealing end facing the sealing element is provided with a flexible plug, the flexible plug being no smaller than the opening of the titration port, so as to completely cover the titration port.

[0008] As a further aspect of the present invention, the area of ​​the flexible plug gradually decreases in the direction toward the inside of the titration port, and the side of the flexible plug away from the sealing end is smaller than the opening of the titration port, so that the flexible plug can be inserted into the titration port.

[0009] As a further embodiment of the present invention, the driving end of the rotating cover is tilted away from the seal and / or a clearance groove is provided on the seal for the driving end to enter.

[0010] As a further embodiment of the present invention, the cover plate unit further includes a frame, which is fixed on the sealing element and surrounds the periphery of the titration port. The rotating cover is rotatably disposed within the frame, and a cavity for accommodating the sealing end is formed within the frame. The size of the cavity matches the size of the sealing end.

[0011] As a further embodiment of the present invention, the sealing member has an assembly hole on one side for assembling the digestion tube, and the open end of the digestion tube is inserted into the assembly hole so that the digestion tube and the sealing member are detachably connected, and the assembly hole and the digestion tube are mutually sealed when connected. Alternatively, the sealing member includes a mounting component for mounting a rotating cap and an assembly tube for connecting the digestion tube. The assembly tube is disposed on the mounting component and includes a first end and a second end that are interconnected. The first end of the assembly tube is inserted into the open end of the digestion tube, and the first end of the assembly tube is mutually sealed when connected to the digestion tube. The second end of the assembly tube is a titration port.

[0012] The opening unit includes a push rod and a first driving platform. The push rod is disposed on the first driving platform. The first driving platform is used to drive the push rod to approach and push the driving end to rotate, so that the sealing end of the rotating cover is away from the titration port. The first driving platform is also used to drive the push rod away from the driving end, so that the sealing end of the rotating cover is reset to the sealing state of the titration port.

[0013] As a further embodiment of the present invention, the burette is disposed on the first drive platform for synchronous movement with the push rod, and the distance from the push rod to the seal is less than the distance from the burette to the seal.

[0014] As a further embodiment of the present invention, the push rod is elastically mounted on the first drive platform to remain relatively stationary with the rotating cover after the rotating cover has been rotated into place, or the difference between the depth of the relief groove and the depth of the titration port is not less than the distance between the end of the push rod and the end of the burette in the length direction of the push rod.

[0015] A digestion titration apparatus includes the above-mentioned titration component. The digestion titration apparatus further includes a sample addition component, a heating component, and a condenser. The sample addition component is used to add sample solution into the digestion tube. The heating component is used to heat the digestion tube. The condenser is used to cool the water vapor generated by heating the digestion tube.

[0016] The present invention has the following beneficial effects: This device mounts the open end of the digestion tube onto a sealing element, and a titration port connecting the digestion tube is formed on the side of the sealing element. The burette can be inserted into the titration port to titrate the digestion tube. A rotating cap is rotatably mounted on the side of the sealing element forming the titration port. The rotating cap has a sealing end for sealing the titration port and a driving end for being driven by external force. The axis of rotation of the rotating cap is parallel to the side of the sealing element forming the titration port. When the rotating cap rotates around the axis, causing the sealing end to disengage from the side of the sealing element, the sealing end of the rotating cap rotates directly away from the titration port, preventing wear against the side of the sealing element. When the device elastically returns to its original position... When the sealing end of the rotating cap is pressed against the side of the seal, the pressure of the sealing end acts directly on the side of the seal forming the titration port, ensuring the sealing effect of the sealing end on the titration port. This ensures that the gas in the digestion tube will not escape from the titration port during subsequent tests, ensuring the safety of the test personnel, the integrity of the equipment, and the accuracy of the test results. At the same time, the rotating cap is rotated and positioned on the side of the seal. When the digestion tube is heated, the thermal expansion of the seal and the rotating cap will not affect the normal operation of the rotating cap, and there will be no situation where the rotating cap cannot move due to thermal expansion. This ensures that the titration port can be opened normally for titration.

[0017] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the titration component structure of the present invention; Figure 2 This is a schematic diagram showing the state of the burette inserted into the burette port according to the present invention; Figure 3 This is a schematic diagram of the closed structure of the rotating cover in this invention; Figure 4 This is a schematic diagram of the opening structure of the rotating cover in this invention; Figure 5 This is a schematic diagram of the first example of a seal in this invention; Figure 6 This is a second example schematic diagram of the seal in this invention; Figure 7 This is a schematic diagram of the digestion titration apparatus in this invention.

[0019] Legend: 1. Digestion tube; 21. Sealing element; 211. Mounting component; 212. Assembly tube; 22. Rotating cap; 221. Sealing end; 222. Driving end; 223. Flexible plug; 23. Elastic reset element; 24. Titration port; 25. Relief groove; 26. Frame; 27. Second driving stage; 3. Burette; 41. Top rod; 42. First driving stage; 5. Condenser; 61. Third driving stage; 62. Sample dispensing dropper. Detailed Implementation

[0020] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0021] Please see Figure 1-7 The present invention provides a technical solution: a titration assembly, comprising a digestion tube 1, a cover plate unit, a burette 3, and a cover opening unit; The cover unit includes a sealing element 21, a rotating cover 22, and an elastic reset element 23. The sealing element 21 is installed at the open end of the digestion tube 1 to close the opening of the digestion tube 1. A titration port 24 is formed on the side of the sealing element 21, and the inner end of the titration port 24 communicates with the inner cavity of the digestion tube 1. The rotating cover 22 is rotatably disposed on the side of the sealing element 21 where the titration port 24 is formed by a rotating shaft, and the rotating shaft of the rotating cover 22 is parallel to the side of the sealing element 21 where the titration port 24 is formed. The rotating cover 22 includes a sealing end 221 located on the first side of the rotating shaft and a drive end located on the second side of the rotating shaft. The rotating cover 22 has a sealing end 221 that abuts against the side of the sealing member 21 and seals the titration port 24. The driving end 222 is driven by an external force to rotate the sealing end 221 around the rotating shaft to move away from the titration port 24. The elastic reset member 23 is provided on the rotating cover 22 and is used to maintain the sealing state of the sealing end 221 to the titration port 24. The opening unit is used to push the driving end 222 to rotate so that the sealing end 221 moves away from the titration port 24. The burette 3 is used to be inserted into the titration port 24 when the sealing end 221 of the rotating cover 22 moves away from the titration port 24 to perform titration. like Figure 1-4As shown, this assembly connects the open end of the digestion tube 1 to the sealing element 21, and seals the opening of the digestion tube 1 through the sealing element 21. A titration port 24 is formed on the side of the sealing element 21, and the inner end of the titration port 24 is connected to the inner cavity of the digestion tube 1. Thus, the burette 3 can be inserted into the titration port 24 to titrate the digestion tube 1. To prevent gas in the digestion tube 1 from escaping from the titration port 24 during subsequent experiments, a rotating cover 22 is installed on the side of the sealing element 21 where the titration port 24 is formed. The rotating cover 22 is rotatably mounted on the sealing element 21 via a rotating shaft. The rotating cover 22 is divided into two parts from the position of the rotating shaft: the sealing end 221 is located on the first side of the rotating shaft, and the driving end 222 is located on the second side of the rotating shaft. The sealing end 221 is used to adhere tightly to the surface of the sealing element 21 and seal the titration port 24, while the driving end 222 is used to drive the sealing end 221 under external force. The rotating cover 22 rotates around the axis to move away from the titration port 24. An elastic reset member 23 is also installed on the rotating cover 22. The elastic reset member 23 is used to maintain the sealing state of the sealing end 221 to the titration port 24. That is, when the driving end 222 of the rotating cover 22 is not subjected to other external forces, the sealing end 221 of the rotating cover 22 will remain pressed against the side of the sealing member 21, so that the titration port 24 opened on the side of the sealing member 21 is in a sealed state, thereby preventing the gas in the digestion tube 1 from escaping during the test. When it is necessary to separate the sealing end 221 of the rotating cover 22 from the side of the sealing member 21, it is only necessary to apply a force opposite to the direction of the elastic reset member 23 to the driving end 222 of the rotating cover 22, so that the rotating cover 22 rotates around the axis to move away from the titration port 24, thereby separating the sealing end 221 of the rotating cover 22 from the side of the sealing member 21. Since the rotating shaft of the rotating cover 22 is parallel to the side of the sealing element 21 forming the titration port 24, when the rotating cover 22 rotates around the rotating shaft and the sealing end 221 disengages from the side of the sealing element 21, the sealing end 221 of the rotating cover 22 rotates directly away from the titration port 24 and will not wear against the side of the sealing element 21. When the elastic reset element 23 drives the sealing end 221 of the rotating cover 22 to press against the side of the sealing element 21, the pressure of the sealing end 221 acts directly on the side of the sealing element 21 forming the titration port 24, which can ensure the sealing effect of the sealing end 221 on the titration port 24, thereby ensuring that the gas in the digestion tube 1 will not escape from the titration port 24 during subsequent tests, ensuring the safety of the test personnel, the integrity of the equipment, and the accuracy of the test results. To enable automatic opening of the rotating cap 22, this assembly also includes a cap opening unit, which includes a push rod 41 and a first drive platform 42. The push rod 41 is mounted on the first drive platform 42. The first drive platform 42 is used to drive the push rod 41 to approach and push the drive end 222 to rotate, so that the sealing end 221 of the rotating cap 22 moves away from the titration port 24. The first drive platform 42 is also used to drive the push rod 41 away from the drive end 222, so that the sealing end 221 of the rotating cap 22 returns to the sealing state of the titration port 24. This device mounts the open end of the digestion tube 1 onto a sealing member 21, and provides a titration port 24 on the side of the sealing member 21 to connect the digestion tube 1. The burette 3 can be inserted into the titration port 24 to titrate the digestion tube 1. A rotating cover 22 is rotatably mounted on the side of the sealing member 21 forming the titration port 24. The rotating cover 22 has a sealing end 221 for sealing the titration port 24 and a driving end 222 for being driven by external force. The axis of rotation of the rotating cover 22 is parallel to the side of the sealing member 21 forming the titration port 24. When the rotating cover 22 rotates around the axis, causing the sealing end 221 to disengage from the side of the sealing member 21, the sealing end 221 of the rotating cover 22 rotates directly away from the titration port 24, preventing wear on the side of the sealing member 21. When the elastic reset member 23 drives the sealing end 221 of the rotating cover 22 to press against the side of the sealing member 21, the pressure of the sealing end 221 acts directly on the side of the sealing member 21 that forms the titration port 24. This ensures the sealing effect of the sealing end 221 on the titration port 24, thereby ensuring that the gas in the digestion tube 1 will not escape from the titration port 24 during subsequent tests. This ensures the safety of the test personnel, the integrity of the equipment, and the accuracy of the test results. At the same time, the rotating cover 22 is rotated and set on the side of the sealing member 21. When the digestion tube 1 is heated, the thermal expansion of the sealing member 21 and the rotating cover 22 will not affect the normal operation of the rotating cover 22. There will be no situation where the rotating cover 22 cannot move due to thermal expansion, ensuring that the titration port 24 can be opened normally for titration.

[0022] Furthermore, a flexible plug 223 is provided on the side of the sealing end 221 facing the sealing member 21. The flexible plug 223 is not smaller than the opening of the titration port 24 so as to completely cover the titration port 24. like Figure 4 As shown, in order to increase the sealing effect of the sealing end 221 of the rotating cap 22 on the titration port 24, a flexible plug 223 is provided on the side of the sealing end 221 facing the sealing member 21. The flexible plug 223 is not smaller than the opening of the titration port 24. When the titration port 24 is sealed by the sealing end 221, the flexible plug 223 of the sealing end 221 can completely cover the opening of the titration port 24. Under the pressure of the elastic reset member 23, the flexible plug 223 can be tightly attached to the side of the sealing member 21 to form the titration port 24, thereby further increasing the sealing effect of the sealing end 221 of the rotating cap 22 on the titration port 24. Furthermore, the area of ​​the flexible plug 223 gradually decreases in the direction toward the inside of the tibbing port 24, and the side of the flexible plug 223 away from the sealing end 221 is smaller than the opening of the tibbing port 24, so that the flexible plug 223 can be inserted into the tibbing port 24. like Figure 4 As shown, in order to further enhance the sealing effect of the sealing end 221 of the rotating cap 22 on the tibbing port 24, the flexible plug 223 is designed as a variable-size structure. The flexible plug 223 gradually shrinks from the side close to the sealing end 221 to the side away from the sealing end 221, and the side of the flexible plug 223 away from the sealing end 221 is smaller than the opening of the tibbing port 24. Thus, the side of the flexible plug 223 away from the sealing end 221 can be inserted into the tibbing port 24. The flexible plug 223 can achieve a seal by contacting the inner surface of the tibbing port 24 with its side, forming a ring seal between the flexible plug 223 and the inner surface of the tibbing port 24, thereby further enhancing the sealing effect of the sealing end 221 on the tibbing port 24.

[0023] Specifically, such as Figure 1 As shown, the drive end 222 of the rotating cover 22 is tilted away from the seal 21 and / or the seal 21 is provided with a clearance groove 25 for the drive end 222 to enter. When the sealing end 221 of the rotating cover 22 is pressed against the titration port 24, in order to allow the driving end 222 of the rotating cover 22 to have rotation space, the driving end 222 of the rotating cover 22 can be tilted away from the seal 21, so that a gap is formed between the driving end 222 of the rotating cover 22 and the seal 21. When the push rod 41 pushes the driving end 222 closer to the seal 21, it can drive the sealing end 221 away from the side of the seal 21. In addition to tilting the drive end 222 away from the seal 21, a clearance groove 25 can be opened on the side of the seal 21. When the push rod 41 pushes the drive end 222 to move toward the seal 21, the drive end 222 can enter the clearance groove 25, so that the rotating cover 22 can rotate around the rotating shaft as a whole, so that the sealing end 221 moves away from the side away from the seal 21. Of course, the drive end 222 can be tilted away from the seal 21 while a clearance groove 25 is opened on the side of the seal 21. This can further increase the rotatable space of the drive end 222, allowing the rotating cover 22 to rotate more.

[0024] Furthermore, the cover plate unit also includes a frame 26, which is fixed on the seal 21 and surrounds the burette 24. The rotating cover 22 is rotatably disposed within the frame 26, and a cavity is formed within the frame 26 to accommodate the sealing end 221. The size of the cavity matches the size of the sealing end 221. like Figure 1As shown, a frame 26 is fixedly installed on the side of the sealing member 21 where the titration port 24 is provided, and the frame 26 surrounds the periphery of the titration port 24. A cavity is formed inside the frame 26 to accommodate the sealing end 221, and the size of the cavity matches the size of the sealing end 221. When the sealing end 221 enters the cavity formed inside the frame 26, the cavity will restrict the movement of the sealing end 221 except for its rotation direction, thereby preventing the sealing end 221 from deviating and ensuring that the sealing end 221 can accurately seal the titration port 24.

[0025] Specifically, the elastic reset element 23 is a conventional technical means in this field, such as... Figure 3-4 As shown, in this example, the elastic reset member 23 includes a torsion spring. The two ends of the torsion spring abut against the rotating cover 22 and the sealing member 21, respectively. The sealing end 221 of the rotating cover 22 is pressed against the side of the sealing member 21 by the elastic force of the torsion spring. When an external force is applied to the driving end 222 and the magnitude of the force exceeds the elastic force of the torsion spring, the rotating cover 22 can be rotated against the elastic force of the torsion spring. When the external force is removed or the magnitude of the force is less than the elastic force of the torsion spring, the torsion spring will drive the rotating cover 22 to rotate and reset, so that the sealing end 221 approaches and seals the titration port 24.

[0026] Furthermore, the burette 3 is mounted on the first drive stage 42 to move synchronously with the push rod 41, and the distance from the push rod 41 to the seal 21 is less than the distance from the burette 3 to the seal 21. like Figure 1 As shown, since the rotating cover 22 seals the burette port 24 through the sealing end 221, and the burette 3 must be inserted into the burette port 24 when titrating, the burette 3 can be mounted on the first drive stage 42 and moved synchronously with the push rod 41. When titration needs to be performed through the burette 3 into the digestion tube 1, the first drive stage 42 drives the push rod 41 and the burette 3 to approach the sealing element 21. In order for the push rod 41 to contact the drive end 222 of the rotating cover 22 first, the push rod needs to be... The distance from the push rod 41 to the seal 21 is less than the distance from the burette 3 to the seal 21. Thus, during the synchronous movement of the push rod 41 and the burette 3, the push rod 41 will first contact the drive end 222 of the rotating cover 22. The push rod 41 will push the rotating cover 22 to rotate, so that the sealing end 221 of the rotating cover 22 moves away from the titration port 24. Before the burette 3 is inserted into the titration port 24, the titration port 24 will be opened, so that the burette 3 can be smoothly inserted into the titration port 24 to complete the titration. When the burette needs to be withdrawn from the burette port 24 after titration, the first drive stage 42 drives the burette 3 and the push rod 41 away from the seal 21. The burette 3 will withdraw from the burette port 24 first, and then the push rod 41 will slowly disengage from the rotating cover 22. The rotating cover 22 will return to the sealing state of the sealing end 221 against the burette port 24 under the drive of the elastic reset member 23. The movement of the burette 3 and the push rod 41 is integrated into the first drive stage 42, eliminating the need to control the movement of the burette 3 and the push rod 41 separately. This saves costs and also prevents the burette 3 from contacting the rotating cover 22 first, ensuring the safety of the burette 3 in use.

[0027] Furthermore, the push rod 41 is elastically mounted on the first drive stage 42, so as to keep it relatively stationary with the rotating cover 22 after the rotating cover 22 is rotated into place, or to ensure that the difference between the depth of the positioning groove 25 and the depth of the burette 24 is not less than the distance from the end of the push rod 41 to the end of the burette 3 in the length direction of the push rod 41. Since the push rod 41 and the burette 3 move synchronously under the drive of the first drive stage 42, and the burette 3 needs the rotating cover 22 to be rotated into place before it can enter the burette port 24, the push rod 41 needs to maintain synchronous movement with the burette 3 while keeping the rotating cover 22 in its current state after driving the rotating cover 22 to be rotated into place, so that the burette 3 can be smoothly inserted into the burette port 24. The following two solutions can be adopted: The push rod 41 is elastically mounted on the first drive stage 42. When the rotating cover 22 is rotated into place, the rotating cover 22 will no longer be able to rotate. Since the push rod 41 is elastically mounted on the first drive stage 42, the push rod 41 will no longer move at this time and can remain relatively stationary with the rotating cover 22. The burette 3 will continue to move into the burette port 24 under the drive of the first drive stage 42. The depth of the relief groove 25 opened on the surface of the seal 21 is controlled. When the push rod 41 pushes the rotating cover 22 to rotate into place, the end of the push rod 41 will disengage from the rotating cover 22 and contact the drive end 222 of the rotating cover 22 through the side of the push rod 41. The push rod 41 will then continue to go deeper into the relief groove 25. However, the relief groove 25 needs to have sufficient depth to allow the push rod 41 to continue to move, leaving a stroke for the burette 3 to be inserted into the burette port 24.

[0028] Figure 5 The first example of the seal is shown. In this example, the side of the seal 21 used for assembling the digestion tube 1 has an assembly hole that communicates with the titration port 24. The open end of the digestion tube 1 is inserted into the assembly hole so that the digestion tube 1 and the seal 21 can be detachably connected. The assembly hole and the digestion tube 1 are sealed to each other when connected. When it is necessary to clean and replace the digestion tube 1, the digestion tube 1 can be pulled out from the assembly hole, thereby separating the digestion tube 1 from the seal 21. Figure 6A second example of a seal is shown. In this example, the seal 21 includes a mounting component 211 for mounting a rotating cap 22 and an assembly tube 212 for connecting a digestion tube 1. The assembly tube 212 is disposed on the mounting component 211 and includes a first end and a second end that are interconnected. The first end of the assembly tube 212 is inserted into the open end of the digestion tube 1 and is sealed to the digestion tube 1 when connected. The second end of the assembly tube 212 is a titration port 24, through which a burette 3 can enter the assembly tube 212 to titrate the digestion tube 1. At the same time, the sealing end 221 of the rotating cap 22 can abut against the second end of the assembly tube 212 to seal the titration port 24. The mounting component 211 is used to mount the rotating cap 22 and the assembly tube 212 and connect to the external structure. There are fewer restrictions on the material used for the mounting component 211; only the material used for the assembly tube 212 needs to be controlled. The cap unit is also simpler to manufacture.

[0029] like Figure 1 As shown, in some examples, the seal 21 is long and narrow, and multiple titration ports 24 are formed on the seal 21 along its length direction and multiple digestion tubes 1 and rotating caps 22 are installed. The titration ports 24, digestion tubes 1 and rotating caps 22 correspond to each other. The cap opening unit also includes a second drive stage 27, which is used to drive the first drive stage 42 to move along the length direction of the seal 21. like Figure 7 As shown, by driving the first drive stage 42 along the length of the seal 21 through the second drive stage 27, the burette 3 can be aligned with the burette port 24 at different positions on the seal 21, and the push rod 41 can be aligned with the rotating cover 22 at different positions on the seal 21, thereby realizing the titration of the digestion tube 1 at different positions. Specifically, the first drive stage 42 and the second drive stage 27 are both conventional technologies in the field, and can be linear actuators such as cylinders, linear motors, hydraulic cylinders and lead screws and nuts. This application does not limit them.

[0030] like Figure 7 As shown, a digestion titration apparatus includes the above-mentioned titration components. The digestion titration apparatus also includes a heating component for heating the digestion tube 1, a condenser tube 5, and a sample addition component. The heating assembly includes a temperature sensing element and a heating element. The heating element and the temperature sensing element are disposed on the digestion tube 1 and are used to heat the digestion tube 1 and control the temperature of the digestion tube 1. Furthermore, the digestion titration apparatus also includes a mixing component for mixing the sample solution in the digestion tube 1.

[0031] The mixing assembly includes a valve located at the bottom of the digestion tube 1. The valve is connected to a gas source, and the sample liquid in the digestion tube 1 is mixed by gas entering the digestion tube 1. The condenser 5 is connected to the digestion tube 1 and is located above the digestion tube 1. There is circulating water in the middle layer of the condenser 5. When the digestion tube 1 is heated, water vapor will enter the condenser 5 and eventually be cooled in the condenser 5 to form water droplets that flow back into the digestion tube 1. The installation of the condenser tube is the same as that of digestion tube 1, as follows: Figure 5 As shown, the top surface of the seal 21 has an assembly hole, and the condenser tube 5 is inserted into the assembly hole on the top surface of the seal 21 to realize the detachable connection between the condenser tube 5 and the seal 21, which facilitates cleaning and replacement of the condenser tube 5. like Figure 6 As shown, the assembly tube 212 also includes a third end, which is inserted into the condenser tube 5 and is sealed to each other when connected to the condenser tube 5. Furthermore, the end of the assembly tube furthest from the digestion tube 1 is inserted into the condenser tube 5, and the digestion tube 1 and the condenser tube 5 are detachably installed on the seal 21 through the assembly tube.

[0032] The condenser tube 5 corresponds one-to-one with the digestion tube 1. The digestion titration device includes at least one digestion tube 1 and one condenser tube 5. When the digestion titration device includes multiple digestion tubes 1 and condenser tubes 5, batch digestion and alternating detection, or batch digestion and batch detection can be realized.

[0033] The sample addition assembly includes a third drive stage 61 and a sample addition dropper 62. The sample addition dropper 62 is located above the condenser tube 5 and is used to add reagents into the condenser tube 5 through the top opening of the condenser tube 5. After the reagents are discharged from the bottom opening of the condenser tube 5, they pass through the seal 21 and enter the digestion tube 3 below. The third drive stage 61 is used to drive the sample addition dropper 62 to move along the length of the seal 21 to add reagents to the digestion tubes 3 at different positions on the seal 21.

[0034] Furthermore, a sample inlet is provided on one side of the seal 21, which is connected to the sample inlet tube. The water sample to be tested enters the digestion tube 3 from the sample inlet tube through the seal 21.

[0035] Furthermore, such as Figure 6 As shown, the assembly tube 212 also includes a fourth end, which is connected to the sample inlet tube. The water sample to be tested enters the digestion tube 3 from the sample inlet tube through the assembly tube 212.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A titration assembly characterized by: It includes a digestion tube (1), a cover plate unit, a burette (3), and a cap opening unit; The cover unit includes a sealing element (21), a rotating cover (22), and an elastic reset element (23). The sealing element (21) is installed at the open end of the digestion tube (1) to close the opening of the digestion tube (1). A titration port (24) is formed on the side of the sealing element (21). The inner end of the titration port (24) is connected to the inner cavity of the digestion tube (1). The rotating cover (22) is rotatably disposed on the side of the sealing element (21) forming the titration port (24) via a rotating shaft, and the rotating shaft of the rotating cover (22) is parallel to the titration port formed by the sealing element (21). On the side of the diaphragm (24), the rotating cover (22) includes a sealing end (221) located on the first side of the rotating shaft and a driving end (222) located on the second side of the rotating shaft. The sealing end (221) is used to abut against the side of the sealing member (21) and seal the diaphragm (24). The driving end (222) is used to drive the sealing end (221) to rotate around the rotating shaft away from the diaphragm (24) by external force. The elastic reset member (23) is provided on the rotating cover (22) and is used to maintain the sealing state of the sealing end (221) to the diaphragm (24). The opening unit is used to drive the drive end (222) to rotate so that the sealing end (221) moves away from the titration port (24). The burette (3) is used to titrate into the burette (3) when the sealing end (221) of the rotating cap (22) is far away from the burette (24).

2. A titration assembly according to claim 1, characterized in that: The sealing end (221) is provided with a flexible plug (223) on the side facing the seal (21), the flexible plug (223) being no smaller than the opening of the titration port (24) to completely cover the titration port (24).

3. A titration assembly according to claim 2, characterized in that: The area of ​​the flexible plug (223) gradually decreases in the direction toward the inside of the titration port (24), and the side of the flexible plug (223) away from the sealing end (221) is smaller than the opening of the titration port (24) so ​​that the flexible plug (223) can be inserted into the titration port (24).

4. A titration assembly according to claim 1, characterized in that: The drive end (222) of the rotating cover (22) is tilted away from the seal (21) or / and the seal (21) has a clearance groove (25) for the drive end (222) to enter.

5. A titration assembly according to claim 1, characterized in that: The cover plate unit also includes a frame (26), which is fixed on the seal (21) and surrounds the puncture port (24). The rotating cover (22) is rotatably disposed in the frame (26). A cavity for accommodating the sealing end (221) is formed in the frame (26), and the size of the cavity matches the size of the sealing end (221).

6. A titration assembly according to claim 1, characterized in that: The sealing element (21) has an assembly hole on one side for assembling the digestion tube (1). The open end of the digestion tube (1) is inserted into the assembly hole so that the digestion tube (1) and the sealing element (21) can be detachably connected, and the assembly hole and the digestion tube (1) are sealed to each other when connected. Alternatively, the sealing element (21) includes a mounting component (211) for mounting the rotating cap (22) and an assembly tube (212) for connecting the digestion tube (1). The assembly tube (212) is provided on the mounting component (211) and includes a first end and a second end that are interconnected. The first end of the assembly tube (212) is inserted into the open end of the digestion tube (1) and the first end of the assembly tube (212) is sealed to the digestion tube (1) when connected. The second end of the assembly tube (212) is a titration port (24).

7. A titration assembly according to claim 1, characterized in that: The opening unit includes a push rod (41) and a first drive platform (42). The push rod (41) is mounted on the first drive platform (42). The first drive platform (42) is used to drive the push rod (41) to approach and push the drive end (222) to rotate so that the sealing end (221) of the rotating cover (22) moves away from the titration port (24). The first drive platform (42) is also used to drive the push rod (41) away from the drive end (222) so that the sealing end (221) of the rotating cover (22) is reset to the sealing state of the titration port (24).

8. A titration assembly according to claim 4, characterized in that: The burette (3) is mounted on the first drive stage (42) and is used to move synchronously with the push rod (41), and the distance from the push rod (41) to the seal (21) is less than the distance from the burette (3) to the seal (21).

9. A titration assembly according to claim 8, characterized in that: The push rod (41) is elastically mounted on the first drive platform (42) to keep relatively stationary with the rotating cover (22) after the rotating cover (22) is rotated into place, or the difference between the depth of the relief groove (25) and the depth of the burette (24) is not less than the distance from the end of the push rod (41) to the end of the burette (3) in the length direction of the push rod (41).

10. A digestion titration apparatus, characterized in that: The digestion titration device includes the titration assembly described in any one of claims 1-9, and further includes a sample addition assembly, a heating assembly, and a condenser (5). The sample addition assembly is used to add sample liquid into the digestion tube (1), the heating assembly is used to heat the digestion tube (1), and the condenser (5) is used to cool the water vapor generated by heating the digestion tube (1).

Images