Colorimetric tube fixing device for digesting water sample

Abstract

The utility model belongs to the field of colorimetric tube racks, and particularly relates to a colorimetric tube fixing device for digesting a water sample. The utility model provides a colorimetric tube fixing device for digesting a water sample, which comprises a tube frame for placing a colorimetric tube, two fixing frames arranged on two sides of the tube frame, and a rotary locking structure arranged at the joint of the tube frame and the fixing frames and used for enabling the tube frame to freely switch a vertical state and an inclined state, and the elastic pressing structure is arranged at the top end of the tube frame and is used for pressing the plunger of the colorimetric tube, so that the colorimetric tube does not need to be repeatedly placed in the heating and colorimetric processes, the whole device can be placed in a heating container after the colorimetric tube is fixed, the angle can be adjusted to reduce the impact of airflow in the tube, and the colorimetric tube fixing device is suitable for colorimetric tubes of various specifications.

Description

Technical Field

[0001] The utility model belongs to the field of colorimetric tube racks, in particular to a colorimetric tube fixing device used for digesting water samples. Background Art

[0002] Methods for digesting total phosphorus and total nitrogen in surface water primarily include alkaline potassium persulfate digestion with UV spectrophotometry and potassium persulfate digestion with ammonium molybdate spectrophotometry. Both methods require placing the digested water sample into a colorimetric tube, adding the potassium persulfate solution, tightly capping the tube, and heating it to 120°C in a high-pressure steam sterilizer for 30 minutes. After cooling, the sample is diluted with water to the mark and colorimetric measurement is performed after color development. During the heating process, the plunger of the colorimetric tube often pushes outward, so the upper end of the tube needs to be taped shut with transparent tape or tied with gauze.

[0003] The Chinese utility model patent with patent publication number CN 220345904 U and publication date of January 16, 2024, discloses a colorimetric tube sealing device, including a base, a connecting assembly and a cover assembly. The base is provided with a hollow test cavity, and a colorimetric tube rack is provided in the test cavity. The connecting assembly is arranged on one side of the top of the base, and one end of the cover assembly is detachably arranged on the connecting assembly. A locking mechanism is provided between the end of the cover assembly away from the connecting assembly and the base.

[0004] The general usage and advantages of the colorimetric tube sealing device in this Chinese utility model patent are as follows: the T-shaped connecting block is slidably inserted into the T-shaped groove to achieve parallel installation of the cover assembly and parallel downward pressure sealing with the tube mouth of the colorimetric tube, thereby achieving one-time large-scale rapid sealing of the colorimetric tubes and ensuring balanced force on the colorimetric tubes during sealing, thereby avoiding damage to the colorimetric tubes caused by uneven force. The colorimetric tubes are sealed by inserting a rubber plug into the colorimetric tube, and the reaction force provided by the deformation of the second spring is used to enhance the sealing effect of the rubber plug on the colorimetric tube, resulting in good sealing performance and high sealing safety.

[0005] However, in actual use, the colorimetric tube sealing device still has at least the following shortcomings, in other words, these are the technical problems to be solved by the present invention: the sealing device cannot be adapted to colorimetric tubes of various heights, and is only suitable for use in colorimetric testing, and is not convenient for being placed in a pressure sterilizer for heating and pressurization.

[0006] Therefore, in summary, there is an urgent need for a colorimetric tube fixing device that can adapt to test tubes of various heights and can be used in a pressure heating container to solve the problems of this type. Utility Model Content

[0007] The utility model provides a colorimetric tube fixing device for digesting water samples, comprising a tube rack for placing the colorimetric tube, two fixing frames arranged on both sides of the tube rack, a rotation locking structure arranged at the connection between the tube rack and the fixing frames, which enables the tube rack to freely switch between vertical and tilted states, and an elastic pressing structure arranged at the top end of the tube rack for pressing a plunger of the colorimetric tube. As a result, the utility model does not require repeated placement of the colorimetric tube during heating and colorimetric processes, and the entire device can be placed in a heating container after the colorimetric tube is fixed. The angle can be adjusted to reduce the impact of the airflow in the tube, and the device is suitable for colorimetric tubes of various specifications.

[0008] The technical solution adopted by the utility model to solve the above-mentioned problem is: a colorimetric tube fixing device for digesting water samples, including a tube rack for placing the colorimetric tube, two fixing frames arranged on both sides of the tube rack, a rotation locking structure arranged at the connection between the tube rack and the fixing frames to enable the tube rack to switch between vertical / inclined states, and an elastic pressing structure arranged at the top end of the tube rack for pressing the plunger of the colorimetric tube.

[0009] A further preferred technical solution is that the pipe rack includes a frame body, two outer plates arranged on both sides of the frame body, a sliding groove arranged on the outer plates, an inner plate slidably connected to the sliding groove, a top plate arranged at the upper end of the inner plate and used to install the elastic pressing structure, and a fixing member arranged on the outer plates and used to lock the position of the inner plate.

[0010] A further preferred technical solution is that the fixing member includes a plurality of through holes provided on the outer plate, a plurality of first threaded holes provided on the inner plate, and first bolts passing through the through holes and threadedly connected to the first threaded holes.

[0011] A further preferred technical solution is that the fixing member includes a threaded rod rotatably connected to the bottom of the sliding groove, and a threaded ring provided at the side end of the inner plate and screwed to the threaded rod.

[0012] A further preferred technical solution is that the rotation locking structure includes a rotation rod provided on the outer plate and rotatably connected to the fixing frame, a convex ring provided on the end of the rotation rod away from the outer plate, and a locking member provided on the fixing frame for adjusting and locking the rotation angle of the pipe rack.

[0013] A further preferred technical solution is that the locking member includes a second threaded hole provided on the outer plate, a first connecting hole and a second connecting hole provided on the fixing frame and matching the second threaded hole in the vertical state and the inclined state of the pipe rack, respectively, and a second bolt passing through the first connecting hole or the second connecting hole for threaded connection with the second threaded hole.

[0014] A further preferred technical solution is that the fixing member further includes a limiting ring arranged on the side end of the inner plate away from the threaded ring, and a guide rod arranged at the bottom of the sliding groove for passing through the limiting ring.

[0015] A further preferred technical solution is that the elastic pressing structure includes a movable groove arranged on the top plate and opening toward the colorimetric tube, a pressing sleeve arranged in the movable groove and sleeved on the outer side of the plunger of the colorimetric tube, and a spring arranged in the movable groove and connected to the pressing sleeve.

[0016] A further preferred technical solution is that an anti-slip layer is provided at the connection between the pressing sleeve and the plunger of the colorimetric tube.

[0017] A further preferred technical solution is that the fixing member further includes a handle provided on the outer end portion of the threaded rod located on the outer side of the outer plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the utility model;

[0019] Figure 2 This is a partial schematic diagram of the first embodiment of the present utility model;

[0020] Figure 3 This is a side view of the pipe rack of Example 1 of the present utility model;

[0021] Figure 4 This is a side view of the vertical state of the first embodiment of the present utility model;

[0022] Figure 5 This is a side view of the inclined state of the first embodiment of the present invention;

[0023] Figure 6 This is a partial top view of the pipe rack of Example 2 of the present utility model;

[0024] Figure 7 This is a partial front view of the pipe rack of Example 2 of the present utility model;

[0025] Figure 8 It is a partial front view of the utility model.

[0026] In the figures, the meanings of the reference numerals are as follows:

[0027] Colorimetric tube a;

[0028] Pipe rack 1, fixed frame 2, rotation locking structure 3, elastic pressing structure 4;

[0029] Frame 11, outer plate 12, sliding groove 13, inner plate 14, top plate 15, fixing member 16, rotating rod 31, protruding ring 32, locking member 33, movable groove 41, pressing sleeve 42, spring 43;

[0030] Through hole 161 , second threaded hole 162 , second bolt 163 , threaded rod 164 , threaded ring 165 , limiting ring 166 , guide rod 167 , handle 168 , first threaded hole 331 , first connecting hole 332 , second connecting hole 333 , first bolt 334 . DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings. The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

[0032] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. They are relative concepts and may therefore change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0033] Example 1

[0034] As attached Figures 1 to 5 , Attachment Figure 8 As shown, a colorimetric tube fixing device for digesting water samples includes a tube rack 1 for placing colorimetric tube a, two fixing frames 2 arranged on both sides of the tube rack 1, a rotation locking structure 3 arranged at the connection between the tube rack 1 and the fixing frames 2 to enable the tube rack 1 to switch between vertical / inclined states, and an elastic pressing structure 4 arranged at the top end of the tube rack 1 for pressing the plunger of the colorimetric tube a.

[0035] In this embodiment, the colorimetric tube fixing device for digesting water samples is generally used as follows:

[0036] The tube rack 1 is used to carry and fix multiple colorimetric tubes a. A plurality of spaced placement slots are provided on the tube rack 1 for fixing the multiple colorimetric tubes a at fixed intervals. A rubber layer is provided in the placement slot to prevent the tube wall from being broken due to impact and contact. The fixing frame 2 is maintained in a vertical state, and the bottom end is preferably provided with a gripping support foot to provide stability. The tube rack 1 can be switched to a vertical or inclined state relative to the fixing frame 2 according to actual conditions, and is fixed by rotating the locking structure 3. The number and position of the elastic pressing structure 4 correspond to the arrangement of the colorimetric tubes a, which is used to provide resistance to the outward impact of the colorimetric tube plunger during the heating process, and allow a certain range of movement to avoid the test tube from being broken due to excessive compression.

[0037] As a preferred embodiment of this embodiment, the pipe rack 1 includes a frame body 11, two outer plates 12 arranged on both sides of the frame body 11, a sliding groove 13 arranged on the outer plates 12, an inner plate 14 slidably connected to the sliding groove 13, a top plate 15 arranged at the upper end of the inner plate 14 and used to install the elastic pressing structure 4, and a fixing member 16 arranged on the outer plate 12 and used to lock the position of the inner plate 14.

[0038] In this embodiment, the height of the tube rack 1 can be adjusted to accommodate colorimetric tubes a of various heights. The rack body 11 mainly includes a multi-layer partition plate arranged between two outer plates 12 for fixing the colorimetric tubes and a bottom plate for carrying the colorimetric tubes. The placement groove is arranged on the bottom plate, and the partition plate is provided with a limiting hole for the colorimetric tube to pass through. The number and position of the limiting holes and the placement grooves correspond to each other. A detachable label is provided on the partition plate to mark and distinguish the samples in the colorimetric tube. The outer plate 12 is connected to the inner plate 14 in a relatively sliding manner, and the two ends of the top plate 15 are respectively connected to the two inner plates 14, so By changing the relative position of the outer plate 12 and the inner plate 14, the height of the top plate 15 relative to the fixing frame can be changed, which is sufficient to accommodate colorimetric tubes of higher heights; the fixing piece 16 is used to fix the relative position of the outer plate 12 and the inner plate 14 to avoid instability during the experiment; the sliding groove 13 can be a vertical through groove provided on the outer plate 12 and opening upward, or it can be provided on the surface of the outer plate 12 close to the inner plate 14, and a vertical groove can be provided on the side wall of the sliding groove 13, and protrusions can be provided on both sides of the inner plate 14 to connect with the grooves on the sliding groove 13 to further enhance stability.

[0039] As a preference of this embodiment, the fixing member 16 includes a plurality of through holes 161 arranged on the outer plate 12, a plurality of first threaded holes 162 arranged on the inner plate 14, and a first bolt 163 passing through the through holes 161 and screwed to the first threaded holes 162.

[0040] In this embodiment, a fixing method by screwing is disclosed. After the inner plate 14 is pulled out to a suitable height, the screw portion of the first bolt 163 is passed through the through hole 161 on the outer plate 12, and the screw portion continues to extend into the inner plate 14 and is screwed to the first threaded hole 162. Finally, the nut of the first bolt 163 is tightened to complete the fixation. Multiple first bolts 163 can be provided to improve the stability of the connection.

[0041] As a preferred embodiment of this embodiment, the rotation locking structure 3 includes a rotation rod 31 provided on the outer plate 12 and rotatably connected to the fixing frame 2, a protruding ring 32 provided on the end of the rotation rod 31 away from the outer plate 12, and a locking member 33 provided on the fixing frame 2 for adjusting and locking the rotation angle of the pipe rack 1.

[0042] In this embodiment, during the heating process, tilting the tube rack can drive the colorimetric tube to tilt, thereby lowering the liquid level. The pressure at the bottom of the colorimetric tube will also decrease, which is beneficial to avoid the problem of colorimetric tube rupture caused by excessive pressure. At the same time, when the contact area between the liquid and the tube wall is reduced, the possibility of liquid splashing is simultaneously reduced, thereby improving the safety of the experimental process. In addition, tilting the colorimetric tube can expand the liquid surface, thereby making it easier to observe the reaction conditions in the colorimetric tube and making comparison easier. The rotating rod 31 is rotatably connected to the side plate of the fixed frame 2, preferably extending through the fixed frame 2 and provided with a protruding ring 32 at the end of the extension to prevent the rotating rod 31 from falling off the fixed frame. When the tube rack needs to be adjusted to the tilted angle, a corner of the tube rack is manually pulled to rotate the rotating rod 31. At this time, the tube rack and the fixed frame are misaligned. Then, the relative position of the tube rack and the fixed frame is fixed by the locking member 33, so that the tube rack can be stably maintained in a tilted state with respect to the bottom surface. After heating and observation are completed, the locking member is opened to return to the natural vertical state and locked again.

[0043] As a preferred embodiment of this embodiment, the locking member 33 includes a second threaded hole 331 provided on the outer plate 12, a first connecting hole 332 and a second connecting hole 333 provided on the fixing frame 2 and matching with the second threaded hole 331 in the vertical state and the inclined state of the pipe rack 1, respectively, and a second bolt 334 passing through the first connecting hole 332 or the second connecting hole 333 for being threadedly connected to the second threaded hole 331.

[0044] In this embodiment, the locking member 33 fixes the relative positions of the pipe rack and the fixing frame by screwing, wherein the first connecting hole 332 and the second connecting hole 333 correspond to the connection points between the pipe rack and the fixing frame in the vertical state and the inclined state respectively, and locking in different states is achieved by extending the second bolt 334 into different connecting holes.

[0045] As a preferred embodiment of this embodiment, the elastic pressing structure 4 includes a movable groove 41 arranged on the top plate 15 and opening toward the colorimetric tube a, a pressing sleeve 42 arranged in the movable groove 41 and sleeved on the outer side of the plunger of the colorimetric tube a, a spring 43 arranged in the movable groove 41 and connected to the pressing sleeve 42, and an anti-slip layer is provided at the connection between the pressing sleeve 42 and the plunger of the colorimetric tube a.

[0046] In this embodiment, in order to avoid the influence of the completely rigid tube rack on the colorimetric tube causing rupture, an elastic pressing structure 4 is provided to limit the movement of the colorimetric tube plunger while providing a certain movement space. The top plate 15 is provided with a plurality of movable grooves 41 on the surface close to the colorimetric tube. The depth of the movable groove is less than the length of the plunger extending into the colorimetric tube to prevent the plunger from completely separating from the colorimetric tube. The spring 43 provides progressive resistance. The upper end of the pressing sleeve 42 slides up and down in the movable groove 41, fitting the shape of the movable groove 41. The lower end is sleeve-shaped and is sleeved on the plunger at the upper end of the colorimetric tube. The inner surface of the sleeve is provided with an anti-slip layer to increase the friction between the two to prevent falling off. The pressing sleeve is preferably a rubber sleeve with stronger adaptability.

[0047] Compared with the existing technology, the technical solution described in this embodiment has the following advantages: the angle of the colorimetric tube can be adjusted according to the experimental status to avoid experimental accidents. There is no need for manual operation to take out the colorimetric tubes, rearrange them, and compare them, which ensures safety while avoiding contamination and dislocation caused by operation. It can also adapt to colorimetric tubes of more heights and has a wider range of applications.

[0048] Example 2

[0049] As attached Figures 6 and 7 As shown, the difference between this embodiment and the first embodiment is that the height of the pipe rack can be adjusted steplessly, as follows:

[0050] The fixing member 16 includes a threaded rod 164 rotatably connected to the bottom of the sliding groove 13 , and a threaded ring 165 disposed at a side end of the inner plate 14 and screwed to the threaded rod 164 .

[0051] In this embodiment, the threaded rod 164 is vertically rotatably installed on the inner bottom surface of the sliding groove 13, and its end extends out of the sliding groove 13 of the outer plate 14 for easy operation. Rotating the threaded rod 164 can drive the threaded ring 165 to move up and down along the length direction of the threaded rod 164. The threaded ring 165 is connected to the side end of the inner plate 14, thereby driving the height of the inner plate 14 to rise or fall. The maximum height of the threaded rod 164 is the sum of the total heights of the outer plate 12 and the inner plate 14, to avoid the inner plate falling off from the sliding groove due to being too high, which is not conducive to returning to the initial state; the threaded ring 165 is preferably arranged at the side end of the central axis of the inner plate to enhance stability during the lifting process.

[0052] As a preference of this embodiment, the fixing member 16 also includes a limiting ring 166 arranged on the side end of the inner plate 14 away from the threaded ring 165, a guide rod 167 arranged at the bottom of the sliding groove 13 and used to pass through the limiting ring 166, and a handle 168 arranged on the outer end of the threaded rod 164 located on the outer side of the outer plate 12.

[0053] In this embodiment, the threaded ring 165 can be set on either side of the inner plate 14, and a guide rod 167 is set on the end away from the threaded ring 165 to cooperate with the limiting ring 165 on the other side of the inner plate 14 to guide the lifting of the inner plate.

[0054] Compared with the existing technology, the technical solution described in this embodiment has the following advantages: the height of the tube rack can adapt to a wider range of colorimetric tube sizes, and the relative distance between the colorimetric tube and the tube rack can be adjusted to the optimal value, which can avoid test tube rupture and prevent liquid splashing caused by plunger detachment, and the application accuracy is higher.

[0055] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications are possible within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. These modifications are non-inventive and are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A colorimetric tube fixing device for digesting water samples, characterized by: The invention comprises a tube rack (1) for placing a colorimetric tube (a), two fixing frames (2) arranged on both sides of the tube rack (1), a rotation locking structure (3) arranged at the connection between the tube rack (1) and the fixing frames (2) so as to enable the tube rack (1) to switch between a vertical state and an inclined state, and an elastic pressing structure (4) arranged at the top end of the tube rack (1) for pressing the plunger of the colorimetric tube (a).

2. A colorimetric tube fixing device for digesting water samples according to claim 1, characterized in that: The pipe rack (1) includes a frame body (11), two outer plates (12) arranged on both sides of the frame body (11), a sliding groove (13) arranged on the outer plates (12), an inner plate (14) slidably connected to the sliding groove (13), a top plate (15) arranged at the upper end of the inner plate (14) and used for mounting the elastic pressing structure (4), and a fixing member (16) arranged on the outer plates (12) and used for locking the position of the inner plate (14).

3. The colorimetric tube fixing device for digesting water samples according to claim 2, characterized in that: The fixing member (16) comprises a plurality of through holes (161) provided on the outer plate (12), a plurality of first threaded holes (162) provided on the inner plate (14), and first bolts (163) passing through the through holes (161) and being screwed to the first threaded holes (162).

4. The colorimetric tube fixing device for digesting water samples according to claim 2, characterized in that: The fixing member (16) comprises a threaded rod (164) rotatably connected to the bottom of the sliding groove (13), and a threaded ring (165) disposed at the side end of the inner plate (14) and screwed to the threaded rod (164).

5. The colorimetric tube fixing device for digesting water samples according to claim 2, characterized in that: The rotation locking structure (3) comprises a rotation rod (31) provided on the outer plate (12) and rotatably connected to the fixing frame (2), a convex ring (32) provided on the end of the rotation rod (31) away from the outer plate (12), and a locking member (33) provided on the fixing frame (2) for adjusting and locking the rotation angle of the pipe rack (1).

6. The colorimetric tube fixing device for digesting water samples according to claim 5, characterized in that: The locking member (33) includes a second threaded hole (331) provided on the outer plate (12), a first connecting hole (332) and a second connecting hole (333) provided on the fixing frame (2) and matching with the second threaded hole (331) in the vertical state and the inclined state of the pipe frame (1), and a second bolt (334) passing through the first connecting hole (332) or the second connecting hole (333) for being threadedly connected with the second threaded hole (331).

7. The colorimetric tube fixing device for digesting water samples according to claim 4, characterized in that: The fixing member (16) further includes a limiting ring (166) provided on the side end of the inner plate (14) away from the threaded ring (165), and a guide rod (167) provided at the bottom of the sliding groove (13) for passing through the limiting ring (166).

8. The colorimetric tube fixing device for digesting water samples according to claim 2, characterized in that: The elastic pressing structure (4) includes a movable groove (41) arranged on the top plate (15) and opening toward the colorimetric tube (a), a pressing sleeve (42) arranged in the movable groove (41) and sleeved on the outer side of the plunger of the colorimetric tube (a), and a spring (43) arranged in the movable groove (41) and connected to the pressing sleeve (42).

9. The colorimetric tube fixing device for digesting water samples according to claim 8, characterized in that: An anti-slip layer is provided at the connection between the pressing sleeve (42) and the plunger of the colorimetric tube (a).

10. The colorimetric tube fixing device for digesting water samples according to claim 4, characterized in that: The fixing member (16) further includes a handle (168) provided on the outer end of the threaded rod (164) located on the outer side of the outer plate (12).

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