Anti-corrosion intelligent liquid preparation device capable of switching solid and liquid reagents

Abstract

The invention relates to the field of liquid preparation equipment, in particular to an anti-corrosion intelligent liquid preparation device capable of switching solid and liquid reagents, which comprises a solid reagent pipeline, two liquid reagent guide heads, a plurality of material guide discs and a positioning frame, the diameter of the middle section of the solid reagent pipeline is smaller than that of the two ends; the two liquid reagent guide heads are symmetrically arranged at the two ends of the solid reagent pipeline, one liquid reagent guide head is used for inputting a liquid reagent, and the other liquid reagent guide head is used for outputting the liquid reagent; the plurality of material guide discs are movably arranged on the middle section of the solid reagent pipeline in a sleeving manner, the end faces of every two adjacent material guide discs are attached to each other, every two adjacent material guide discs can rotate within a set angle, and the output position of a liquid reagent can be changed through rotation of the plurality of material guide discs; and the positioning frame is arranged on the two liquid reagent guide heads and can be fixed at a specified position. The problems that in the prior art, solid-liquid separation conveying is poor in integration and the process is prone to being interrupted are solved.

Description

Technical Field

[0001] This invention relates to the field of liquid preparation equipment, and in particular to an intelligent liquid preparation device with corrosion-resistant and switchable solid-liquid reagents. Background Technology

[0002] In fields such as chemical experiments, biomedicine, and industrial production, reagent preparation is a critical operational step, requiring strict standards for accuracy, efficiency, and equipment corrosion resistance. Currently, most mainstream reagent preparation devices employ a solid-liquid separation delivery structure. Solid reagents are typically transported through independent pipelines, while liquid reagents rely on external conduits or fixed flow channels for supply. This presents the following technical challenges: Existing devices struggle to integrate solid reagent pipelines with liquid reagent flow channels, frequently resulting in issues like solid reagent blockage and liquid reagent spillage, interrupting the solution preparation process and impacting operational continuity. Traditional solution preparation devices often have fixed liquid flow channels; adjusting the type or flow rate requires disassembling and replacing flow channel components, a cumbersome and time-consuming process that fails to meet the need for rapid switching between multiple reagents. While some adjustable flow channel devices use valve control, their sealing structures are susceptible to corrosion from corrosive reagents, leading to leaks after prolonged use and reduced solution preparation accuracy. Most solution preparation devices use ordinary metal or plastic flow channel components, which are prone to aging and leaching when in contact with strong acids or alkalis, shortening equipment lifespan and potentially contaminating reagents, affecting the accuracy of experimental or production results. Existing devices largely rely on manual adjustment of flow channels or monitoring of the solution preparation process, making automated control of liquid channel switching difficult and lacking real-time monitoring of reagent delivery status, increasing the risk of human error leading to deviations in solution ratios.

[0003] In summary, current liquid preparation devices have significant shortcomings in terms of integrated design, channel switching flexibility, corrosion resistance, and intelligent control. Summary of the Invention

[0004] Based on this, it is necessary to provide an intelligent liquid preparation device with corrosion resistance and switchable solid-liquid reagents to address the above-mentioned technical problems. This device solves the problems of poor integration and easy process interruption caused by solid-liquid separation and transportation in the existing technology. It realizes integrated and coordinated transportation of solid and liquid reagents. The liquid output position can be changed by rotating the guide plate without disassembly, which can meet the switching needs of multi-component reagents. The positioning frame ensures operational stability, avoids liquid spillage and solid blockage, and improves the continuity and efficiency of liquid preparation.

[0005] This invention provides an intelligent liquid preparation device with corrosion-resistant and switchable solid-liquid reagents, comprising: A solid reagent tube, the diameter of the middle section being smaller than that between the two ends, and the solid reagent tube being detachable; Two liquid reagent guides are symmetrically arranged at both ends of the solid reagent pipeline. One liquid reagent guide is used to input liquid reagent, and the other liquid reagent guide is used to output liquid reagent. Multiple guide discs are movably sleeved in the middle section of the solid reagent pipeline, and the end faces of two adjacent guide discs are in contact with each other. The two adjacent guide discs can rotate within a set angle. The rotation of the multiple guide discs can change the output position of the liquid reagent. The positioning bracket, mounted on the two liquid reagent guides, can be fixed in a designated position.

[0006] In one embodiment, the solid reagent pipeline includes an intermediate tube, an externally threaded tube, and a first positioning ring; the intermediate tube has internally threaded grooves at both ends and the connection point of its inner surface, one end of the externally threaded tube is installed in the internally threaded groove, and the first positioning ring is connected to the other end of the externally threaded tube.

[0007] In one embodiment, a first slot is provided in the middle of the liquid reagent guide, the first slot passes through the liquid reagent guide, a second slot is provided at the end of the liquid reagent guide away from the center of the intermediate tube, the external threaded tube is inserted into the first slot, the first positioning ring is engaged in the second slot, and the end face of the liquid reagent guide is provided with a plurality of liquid channels in a ring array, the liquid channels passing through both ends of the liquid reagent guide.

[0008] In one embodiment, the connection between the second slot and the first slot is configured as a curved surface, and the first positioning ring is connected to the external threaded tube by an annular connecting plate. The surface of the annular connecting plate is curved away from the center of the intermediate tube, and the surface of the annular connecting plate is in contact with the curved surface.

[0009] In one embodiment, the outer ring of the first positioning ring is provided with a plurality of first positioning blocks arranged in a circular array, the inner ring of the first positioning ring is provided with a plurality of first positioning grooves arranged in a circular array, the outer ring of the second slot is provided with a plurality of second positioning grooves, and the plurality of first positioning blocks are respectively engaged in the plurality of second positioning grooves.

[0010] In one embodiment, the guide plate includes an annular plate and a second positioning block; the annular plate is sleeved on the intermediate tube, and the surface of the annular plate has a plurality of guide holes arranged in an annular array. A third positioning groove is provided at the connection between the bottom surface of the annular plate and the outer ring. The second positioning block is fixed to the upper surface of the annular plate and is engaged in the third positioning groove.

[0011] In one embodiment, the top of the feed inlet is provided with an opening, and the diameter of the opening is larger than the diameter of the liquid channel.

[0012] In one embodiment, the third positioning groove is configured as a fan-shaped annular groove, and the inner diameter of the third positioning groove is greater than the maximum distance from the opening to the central axis of the annular plate.

[0013] In one embodiment, the included angle between the two end faces of the third positioning groove is the same as the array angle between two adjacent guide holes.

[0014] In one embodiment, the positioning frame includes a second positioning ring, an arc-shaped plate, a bent plate, and a flat block; the two positioning rings are respectively sleeved on the two liquid reagent guides, and the positioning rings have mounting holes. By installing fasteners in the mounting holes, the fasteners are inserted into the outer ring of the liquid reagent guides, thereby fixing the second positioning rings. The arc-shaped plate is disposed between two adjacent second positioning rings, and the two ends of the arc-shaped plate are respectively connected to the two second positioning rings through two bent plates. The outer surface of the arc-shaped plate is provided with a flat block, and the flat block has threaded holes.

[0015] The aforementioned intelligent liquid dispensing device for corrosion-resistant, switchable solid-liquid reagents delivers solid reagents through a detachable solid reagent pipeline with a central diameter smaller than that at both ends. Liquid reagents are input from one liquid reagent guide head, pass through multiple guide discs movably fitted in the middle of the solid reagent pipeline with adjacent end faces, and finally output from another liquid reagent guide head. Adjacent guide discs can rotate within a set angle to adjust the liquid flow path. A positioning frame is installed on the two liquid reagent guide heads to fix the device in a designated position. This device solves the problems of poor integration and easy process interruption caused by solid-liquid separation in existing technologies, achieving integrated and coordinated solid-liquid reagent delivery. The liquid output position can be changed by rotating the guide discs without disassembly, meeting the switching needs of multi-component reagents. The positioning frame ensures operational stability, prevents liquid spillage and solid blockage, and improves the continuity and efficiency of liquid dispensing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A three-dimensional structural schematic diagram of the liquid preparation device provided by the present invention; Figure 2 This is a cross-sectional structural diagram of the liquid preparation device provided by the present invention; Figure 3 A schematic diagram of the planar structure of the liquid preparation device provided by the present invention; Figure 4 This is a schematic diagram of the structure of the liquid reagent guide provided by the present invention; Figure 5 This is a schematic diagram of the solid reagent pipeline provided by the present invention; Figure 6 A three-dimensional structural diagram of the guide tray provided by the present invention; Figure 7 A schematic diagram of the planar structure of the guide tray provided by the present invention; Figure 8 This is a schematic diagram of the positioning frame provided by the present invention.

[0018] Figure label: 100. Solid reagent pipeline; 110. Intermediate pipe; 111. Internal threaded groove; 120. External threaded pipe; 130. Annular connecting plate; 140. First positioning ring; 141. First positioning groove; 150. First positioning block; 200. Liquid reagent guide; 210. First slot; 220. Second slot; 230. Curved surface; 240. Second positioning groove; 250. Liquid channel; 300. Guide tray; 310. Annular plate; 311. Opening; 312. Guide hole; 313. Third positioning groove; 320. Second positioning block; 400. Positioning frame; 410. Second positioning ring; 411. Mounting hole; 420. Arc plate; 430. Bend plate; 440. Flat block; 441. Threaded hole. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The following is combined Figures 1 to 8 This invention describes an intelligent liquid preparation device for corrosion-resistant, switchable solid-liquid reagents.

[0021] like Figures 1 to 3As shown, in one embodiment, an intelligent liquid dispensing device for corrosion-resistant, switchable solid-liquid reagents includes a solid reagent pipeline 100, two liquid reagent guides 200, multiple guide trays 300, and a positioning frame 400. The diameter of the middle section of the solid reagent pipeline 100 is smaller than that between its two ends, and the solid reagent pipeline 100 is detachable. The two liquid reagent guides 200 are symmetrically arranged at both ends of the solid reagent pipeline 100, one liquid reagent guide 200 is used for inputting liquid reagent, and the other liquid reagent guide 200 is used for outputting liquid reagent. The multiple guide trays 300 are movably sleeved on the middle section of the solid reagent pipeline 100, and the end faces of two adjacent guide trays 300 are in contact with each other, and two adjacent guide trays 300 can rotate within a set angle. The rotation of the multiple guide trays 300 can change the output position of the liquid reagent. The positioning frame 400 is installed on the two liquid reagent guides 200 and can be fixed in a designated position.

[0022] The aforementioned intelligent liquid dispensing device for corrosion-resistant, switchable solid-liquid reagents delivers solid reagents through a detachable solid reagent pipe 100 with a mid-section diameter smaller than both ends. Liquid reagents are input from one liquid reagent guide head 200, pass through multiple guide discs 300 movably fitted in the mid-section of the solid reagent pipe 100 with adjacent end faces abutting, and finally output from another liquid reagent guide head 200. Adjacent guide discs 300 can rotate within a set angle to adjust the liquid flow path. A positioning frame 400 is mounted on the two liquid reagent guide heads 200 to fix the device in a designated position. This device solves the problems of poor integration and easy process interruption caused by solid-liquid separation in existing technologies, achieving integrated and coordinated solid-liquid reagent delivery. The liquid output position can be changed by rotating the guide discs 300 without disassembly, meeting the switching needs of multi-component reagents. The positioning frame 400 ensures operational stability, prevents liquid spillage and solid blockage, and improves the continuity and efficiency of liquid dispensing.

[0023] like Figure 5 As shown, in one embodiment, the solid reagent pipeline 100 includes an intermediate pipe 110, an externally threaded pipe 120, and a first positioning ring 140; the intermediate pipe 110 has an internally threaded groove 111 at both ends and the connection point of the inner surface, one end of the externally threaded pipe 120 is installed in the internally threaded groove 111, and the first positioning ring 140 is connected to the other end of the externally threaded pipe 120.

[0024] Specifically, when assembling the solid reagent pipeline 100, screw one end of the externally threaded tube 120 into the internally threaded groove 111 at the connection point of the inner surfaces of both ends of the intermediate tube 110. To disassemble, simply unscrew the externally threaded tube 120 in the reverse direction. Addressing the current pain point of difficult maintenance due to blockages in the solid reagent pipeline 100, the detachable threaded connection structure facilitates quick disassembly and cleaning of blockages. Simultaneously, the cooperation between the external thread and the internally threaded groove 111 improves the sealing of the solid transport channel, preventing solid reagent leakage or moisture absorption, extending the pipeline's service life, and reducing maintenance costs.

[0025] like Figure 4 As shown, in one embodiment, a first slot 210 is provided in the middle of the liquid reagent guide 200, the first slot 210 passes through the liquid reagent guide 200, a second slot 220 is provided at the end of the liquid reagent guide 200 away from the center of the intermediate tube 110, an external threaded tube 120 is inserted into the first slot 210, a first positioning ring 140 is engaged in the second slot 220, and a plurality of liquid channels 250 are provided in a ring array on the end face of the liquid reagent guide 200, the liquid channels 250 pass through both ends of the liquid reagent guide 200.

[0026] Specifically, the externally threaded tube 120 of the solid reagent tube 100 is inserted into the first slot 210 of the liquid reagent guide head 200, and the first positioning ring 140 is engaged in the second slot 220 at the end of the liquid reagent guide head 200 away from the center of the intermediate tube 110. The liquid reagent enters and exits through the liquid channels 250 opened in the annular array on the end face of the liquid reagent guide head 200, and the flow path is adjusted in conjunction with the guide tray 300. This solves the problems of unstable solid-liquid connection and easy liquid overflow. The insertion and engagement structure of the slot and the tube improves the sealing of the solid-liquid component connection. The annular array of liquid channels 250 provides a basis for multi-channel switching, reduces the decrease in liquid dispensing accuracy caused by liquid overflow, and simplifies the assembly process, improving the ease of operation.

[0027] In one embodiment, the connection between the second slot 220 and the first slot 210 is set as a curved surface 230, and the first positioning ring 140 is connected to the external threaded tube 120 by an annular connecting plate 130. The surface of the annular connecting plate 130 is curved away from the center of the intermediate tube 110, and the surface of the annular connecting plate 130 is in contact with the curved surface 230.

[0028] Specifically, during assembly, the annular connecting plate 130 between the first positioning ring 140 and the external threaded tube 120 is inserted into the slot along with the external threaded tube 120. Its curved surface is tightly fitted with the curved surface 230 at the connection between the second slot 220 and the first slot 210, forming a sealed contact. Addressing the problem of corrosion and leakage in existing sealing structures, the fitting design of the curved surface 230 with the curved connecting plate increases the sealing contact area, reduces the probability of corrosive reagents penetrating into gaps, improves the device's corrosion resistance and sealing reliability, avoids reagent leakage and contamination, prevents deviations in solution preparation accuracy, and extends the service life of the sealing structure.

[0029] In one embodiment, the outer ring of the first positioning ring 140 is provided with a plurality of first positioning blocks 150, which are arranged in a ring array. The inner ring of the first positioning ring 140 is provided with a plurality of first positioning grooves 141, which are arranged in a ring array. The outer ring of the second slot 220 is provided with a plurality of second positioning grooves 240, and the plurality of first positioning blocks 150 are respectively engaged in the plurality of second positioning grooves 240.

[0030] Specifically, the problem of misalignment of the liquid channel 250 caused by circumferential rotation is solved. The snap-fit ​​structure between the positioning block and the positioning groove restricts the circumferential rotation of the first positioning ring 140, ensuring that the liquid channel 250 of the liquid reagent guide head 200 is always precisely aligned with the guide plate 300, avoiding the deviation of the liquid ratio caused by misalignment, and improving the structural stability and liquid ratio accuracy.

[0031] like Figure 6 and Figure 7 As shown, in one embodiment, the guide plate 300 includes an annular plate 310 and a second positioning block 320; the annular plate 310 is sleeved on the intermediate tube 110, and a plurality of guide holes 312 are opened in an annular array on the surface of the annular plate 310. A third positioning groove 313 is opened at the connection between the bottom surface of the annular plate 310 and the outer ring. The second positioning block 320 is fixed on the upper surface of the annular plate 310 and is engaged in the third positioning groove 313.

[0032] Specifically, the annular plate 310 of the guide plate 300 is fitted onto the intermediate tube 110 of the solid reagent pipeline 100. Adjacent guide plates 300 are connected by a second positioning block 320 on the upper surface of one guide plate 300 engaging with a third positioning groove 313 on the outer ring of the bottom surface of the other guide plate 300. When the guide plate 300 is rotated, the second positioning block 320 moves within the third positioning groove 313 to limit the rotation angle, and the liquid flows through the guide holes 312 in an annular array on the surface of the annular plate 310. Addressing the cumbersome switching of the liquid channel 250 in existing technologies, the snap-fit ​​connection of adjacent guide plates 300 allows for controllable rotation angle, enabling adjustment of the connection between the guide holes 312 and the liquid channel 250 without disassembly, improving the flexibility and efficiency of channel switching. Simultaneously, the annular plate 310 fitting structure ensures the coaxiality of the guide plate 300 and the solid pipeline, preventing liquid transport deviation.

[0033] In one embodiment, the top of the feed hole 312 is provided with an opening 311, and the diameter of the opening 311 is larger than the diameter of the liquid channel 250.

[0034] Specifically, after the liquid reagent flows out of the liquid channel 250 of the liquid reagent guide head 200, it enters the guide hole 312 through an opening 311 at the top of the guide hole 312 with a diameter larger than that of the liquid channel 250, and is then conveyed to the designated output position through the guide hole 312. This solves the problem of easy blockage of liquid at the channel connection. The large-diameter opening 311 increases the inlet area of ​​the liquid entering the guide hole 312, reduces the stagnation and blockage caused by the mismatch of the channel diameter, ensures smooth liquid delivery, reduces the probability of interruption in the liquid preparation process, and improves the efficiency and stability of liquid preparation.

[0035] In one embodiment, the third positioning groove 313 is configured as a fan-shaped annular shape, and the inner diameter of the third positioning groove 313 is greater than the maximum distance from the opening 311 to the central axis of the annular plate 310.

[0036] Specifically, when the adjacent guide plate 300 rotates, the second positioning block 320 moves in the third positioning groove 313 of the fan-shaped annulus. Because the inner diameter of the third positioning groove 313 is greater than the maximum distance from the opening 311 to the central axis of the annular plate 310, the positioning groove will not block the opening 311 of the guide hole 312.

[0037] In one embodiment, the included angle between the two end faces of the third positioning groove 313 is the same as the array angle between two adjacent guide holes 312.

[0038] Specifically, when the guide plate 300 is rotated, when the second positioning block 320 moves to both ends of the groove in the third positioning groove 313, the guide plate 300 rotates by an array angle between two adjacent guide holes 312, so that the current guide hole 312 is precisely aligned with the liquid channel 250.

[0039] like Figure 8 As shown, in one embodiment, the positioning frame 400 includes a second positioning ring 410, an arc plate 420, a bent plate 430, and a flat block 440. The two positioning rings are respectively sleeved on the two liquid reagent guides 200. The positioning rings are provided with mounting holes 411. By installing fasteners in the mounting holes 411, the fasteners are inserted into the outer ring of the liquid reagent guides 200, which can fix the second positioning rings 410. The arc plate 420 is disposed between two adjacent second positioning rings 410, and the two ends of the arc plate 420 are respectively connected to the two second positioning rings 410 through two bent plates 430. The outer surface of the arc plate 420 is provided with a flat block 440, and the flat block 440 is provided with a threaded hole 441.

[0040] Specifically, the two second positioning rings 410 of the positioning frame 400 are respectively fitted onto the two liquid reagent guides 200. The second positioning rings 410 are fixed by fasteners inserted into the mounting holes 411 on the positioning rings and then into the outer ring of the liquid reagent guides 200. The arc plate 420 connects the two second positioning rings 410 through the bending plate 430 to form a support. The device is then fixed in the designated position by the threaded holes 441 on the outer surface flat block 440 of the arc plate 420.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A smart liquid preparation device with corrosion-resistant and switchable solid-liquid reagents, characterized in that, include: A solid reagent tube, the diameter of the middle section being smaller than that between the two ends, and the solid reagent tube being detachable; Two liquid reagent guides are symmetrically arranged at both ends of the solid reagent pipeline. One liquid reagent guide is used to input liquid reagent, and the other liquid reagent guide is used to output liquid reagent. Multiple guide discs are movably sleeved in the middle section of the solid reagent pipeline, and the end faces of two adjacent guide discs are in contact with each other. The two adjacent guide discs can rotate within a set angle. The rotation of the multiple guide discs can change the output position of the liquid reagent. The positioning bracket, mounted on the two liquid reagent guides, can be fixed in a designated position.

2. The intelligent liquid preparation device with switchable solid-liquid reagents for corrosion resistance according to claim 1, characterized in that, The solid reagent pipeline includes an intermediate tube, an externally threaded tube, and a first positioning ring; the intermediate tube has internally threaded grooves at both ends and the connection point of its inner surface, one end of the externally threaded tube is installed in the internally threaded groove, and the first positioning ring is connected to the other end of the externally threaded tube.

3. The intelligent liquid preparation device with switchable solid-liquid reagents for corrosion resistance according to claim 2, characterized in that, The liquid reagent guide has a first slot in the middle, which passes through the liquid reagent guide. The liquid reagent guide has a second slot at the end away from the center of the intermediate tube. The external threaded tube is inserted into the first slot, and the first positioning ring is engaged in the second slot. The end face of the liquid reagent guide has multiple liquid channels in a ring array, which pass through both ends of the liquid reagent guide.

4. The intelligent liquid preparation device with switchable solid-liquid reagents for corrosion resistance according to claim 3, characterized in that, The connection between the second slot and the first slot is set as a curved surface. The first positioning ring is connected to the external threaded tube by an annular connecting plate. The surface of the annular connecting plate is curved away from the center of the intermediate tube, and the surface of the annular connecting plate fits the curved surface.

5. The intelligent liquid preparation device with switchable solid-liquid reagents for corrosion resistance according to claim 4, characterized in that, The outer ring of the first positioning ring is provided with a plurality of first positioning blocks, which are arranged in a ring array. The inner ring of the first positioning ring is provided with a plurality of first positioning slots, which are arranged in a ring array. The outer ring of the second slot is provided with a plurality of second positioning slots, and the plurality of first positioning blocks are respectively engaged in the plurality of second positioning slots.

6. The intelligent liquid preparation device with switchable solid-liquid reagents for corrosion resistance according to claim 5, characterized in that, The guide plate includes an annular plate and a second positioning block; the annular plate is sleeved on the intermediate tube, and the surface of the annular plate has a plurality of guide holes arranged in an annular array. A third positioning groove is provided at the connection between the bottom surface of the annular plate and the outer ring. The second positioning block is fixed on the upper surface of the annular plate and is engaged in the third positioning groove.

7. The intelligent liquid preparation device with switchable solid-liquid reagents for corrosion resistance according to claim 6, characterized in that, The top of the feed inlet is open, and the diameter of the open is larger than the diameter of the liquid channel.

8. The intelligent liquid preparation device with switchable solid-liquid reagents for corrosion resistance according to claim 7, characterized in that, The third positioning groove is configured as a fan-shaped ring, and the inner diameter of the third positioning groove is greater than the maximum distance from the opening to the central axis of the ring plate.

9. The intelligent liquid preparation device for corrosion-resistant switchable solid-liquid reagents according to claim 8, characterized in that, The included angle between the two end faces of the third positioning groove is the same as the array angle between the two adjacent guide holes.

10. The intelligent liquid preparation device for corrosion-resistant switchable solid-liquid reagents according to claim 9, characterized in that, The positioning frame includes a second positioning ring, an arc-shaped plate, a bent plate, and a flat block. The two positioning rings are respectively sleeved on the two liquid reagent guides. The positioning rings have mounting holes. By installing fasteners in the mounting holes, the fasteners are inserted into the outer ring of the liquid reagent guides, which can fix the second positioning rings. The arc-shaped plate is disposed between two adjacent second positioning rings, and the two ends of the arc-shaped plate are respectively connected to the two second positioning rings through two bent plates. The outer surface of the arc-shaped plate is provided with a flat block, and the flat block has threaded holes.

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