Water quality detection auxiliary device for water quality laboratory

Abstract

The utility model relates to a water quality detection auxiliary device for a water quality laboratory, which comprises a bracket, a mounting ring, a plurality of spiral springs and a first fixing part, and the plurality of spiral springs are uniformly distributed around a ring hole of the mounting ring along the circumferential direction; the upper end of the spiral spring is fixedly connected with the mounting ring, the lower end of the spiral spring is fixedly connected with the support, and the first fixing part is used for detachably fixing the bottle opening end of a conical bottle to the middle of a ring hole of the mounting ring. Due to the adoption of the technical scheme, when the water quality detection auxiliary device for the water quality laboratory is used for titration method detection on the pH value of a water sample, the conical flask does not need to be held by hand to shake, so that the possibility that an acid solution or an alkali solution is dripped on the hand of an experimenter can be reduced; and the possibility that the skin of an experimenter is injured can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of water quality testing technology, specifically to an auxiliary device for water quality testing in a water quality laboratory. Background Technology

[0002] In water quality laboratories, titration is often used to determine the acidity or alkalinity of water samples during pH testing. The steps for titration are as follows: First, a certain amount of indicator is added to the conical flask containing the water sample. The indicator reacts with the acidic or alkaline substances in the water sample, changing color accordingly. Different colors will appear depending on whether the water sample is acidic or alkaline. Based on the color, a preliminary judgment can be made as to whether the water sample is acidic or alkaline. Then, based on the color, a certain amount of acidic solution (such as HCl solution) or alkaline solution (such as NaOH solution) is added to the burette: if the water sample is acidic, an alkaline solution is added for titration; if the water sample is alkaline, an alkaline solution is added for titration. If the sample is alkaline, add an acid solution to the burette for titration. While adding the acid or alkali solution dropwise into the water sample (after adding the indicator) in the conical flask through the burette, shake the flask to mix the acid and alkali, thus neutralizing the solution. The acid or alkali in the water sample will be gradually consumed during the neutralization reaction, and the water sample solution will gradually change to a neutral solution. The color of the water sample in the conical flask will gradually fade until it returns to the color of the water sample before the indicator was added, indicating the titration endpoint has been reached. The pH of the water sample is then determined by the amount of acid or alkali solution consumed during the experiment.

[0003] During the process of mixing the solution in the conical flask, the experimenter usually needs to hold the conical flask and shake it. During the shaking process, the acid or alkali solution that drips down may drip onto the skin of the staff and cause skin damage. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an auxiliary device for water quality testing in water quality laboratories, so as to solve the problem that in the existing technology, when titrating the acidity and alkalinity of water samples, the experimenter usually needs to hold the conical flask and shake it. During the shaking process, the acid or alkaline solution dripping down may drip onto the skin of the staff and cause damage to the staff's skin.

[0005] This utility model is achieved through the following technical solution:

[0006] A water quality laboratory water quality testing auxiliary device includes a bracket, a mounting ring, a helical spring, and a first fixing part. There are multiple helical springs, which are evenly arranged around the annular hole of the mounting ring in a circumferential direction. The upper end of the helical spring is fixedly connected to the mounting ring, and the lower end is fixedly connected to the bracket. The first fixing part is used to detachably fix the mouth end of the conical flask to the middle of the annular hole of the mounting ring.

[0007] Furthermore, it also includes a support member and a motor. The support member is used to abut against the outer side of the lower end of the conical bottle, and the motor is used to drive the support member to make a circular motion around the axis of the mounting ring. The distance from the end face of the support member facing the axis of the mounting ring to the axis of the mounting ring is less than the radius of the lower end of the conical bottle.

[0008] Furthermore, the bracket includes a support base and a support ring, the lower end of the helical spring is fixed to the upper end of the support ring, and the support ring is slidably connected to the support base.

[0009] Furthermore, the support base includes a base, an upright, a crossbar, a slider, and a second fixing part. The upright is vertically arranged, and its lower end is fixed to the base. The crossbar is perpendicular to the upright and has a groove along its vertical direction. One end of the crossbar is fixed to a slider, which slides within the groove. The other end of the crossbar is fixed to the support ring. The second fixing part is used to fix the height position of the slider.

[0010] Furthermore, the crossbar is provided with a second screw hole; the second fixing part includes a threaded rod, the threaded rod is arranged vertically, the lower end of the threaded rod is rotatably connected to the base, and the threaded rod is screwed into the second screw hole.

[0011] Furthermore, the upper end of the base is recessed downward to form a rotating groove, and the lower part of the inner sidewall of the rotating groove is recessed to form an annular groove; the second fixing part also includes a rotating rod and a limiting ring, the lower end of the threaded rod is fixedly connected to the rotating rod, the rotating rod is rotatably fitted in the rotating groove, the limiting ring protrudes outward from the outer circumference of the lower end of the rotating rod, the limiting ring is located in the annular groove, and the limiting ring cooperates with the annular groove.

[0012] Furthermore, a through hole is formed on the side wall of the mounting ring, the through hole being arranged along a direction perpendicular to the axis of the mounting ring, and the through hole penetrating the inner and outer side walls of the mounting ring; the first fixing part includes a first abutting rod, a first abutting block, a second abutting block, and a locking part, the first abutting rod being slidably fitted in the through hole, the first abutting block being fixedly connected to one end of the first abutting rod located in the ring hole of the mounting ring, the second abutting block being directly opposite the first abutting block, the second abutting block being fixedly connected to the inner side wall of the ring hole of the mounting ring, and the locking part being used to lock the first abutting rod in the through hole.

[0013] Furthermore, a first screw hole is formed on the upper end face of the mounting ring, the first screw hole connecting the upper end face of the mounting ring and the inner side wall of the through hole; the locking part includes a bolt, the bolt is screwed into the first screw hole, and the lower end of the bolt abuts against the first abutting rod.

[0014] Furthermore, the motor output shaft is coaxial with the mounting ring; the supporting member includes a second supporting rod, a first connecting rod, and a second connecting rod. The first connecting rod is perpendicular to the axis of the mounting ring, and the second connecting rod is parallel to the axis of the mounting ring. One end of the first connecting rod is connected to the output shaft of the motor, and the other end of the first connecting rod is fixed to the lower end of the second connecting rod. The second supporting rod is parallel to the first connecting rod, and the end of the second supporting rod facing away from the axis of the mounting ring is connected to the upper end of the second connecting rod. The distance from the end face of the second supporting rod facing the axis of the mounting ring to the axis of the mounting ring is less than the radius of the lower end of the conical bottle.

[0015] Furthermore, the second abutment rod is connected to an arc-shaped plate facing the direction of the motor output shaft, the inner arc surface of the arc plate is arranged facing the direction of the motor output shaft, and the inner arc surface of the arc plate abuts against the outer side of the lower part of the conical bottle.

[0016] The beneficial effects of this utility model are as follows:

[0017] When using the water quality laboratory water quality testing auxiliary device described in this utility model to titrate the acidity and alkalinity of water samples, there is no need to shake the conical flask by hand, which can reduce the possibility of acid or alkaline solutions dripping onto the hands of the experimenter and reduce the possibility of skin damage to the experimenter.

[0018] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the water quality laboratory water quality testing auxiliary device of this utility model;

[0020] Figure 2 This is a top view of the structure of the water quality laboratory water quality testing auxiliary device of this utility model;

[0021] Figure 3 For the present utility model Figure 2 A cross-sectional view of the structure of AA.

[0022] In the diagram: 1. Mounting ring; 2. Helical spring; 3. Motor; 4. Support ring; 5. Base; 6. Upright post; 7. Horizontal bar; 71. Slider; 8. Threaded rod; 81. Rotating rod; 82. Limiting ring; 91. First connecting rod; 92. Second connecting rod; 101. First abutment block; 102. Second abutment block; 111. First abutment rod; 112. Second abutment rod; 12. Bolt; 13. Through hole; 14. Arc plate; 15. Conical flask; Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0028] Please see Figure 1-3 This utility model provides a technical solution: a water quality laboratory water quality testing auxiliary device, including a bracket, a mounting ring 1, a helical spring 2, and a first fixing part. There are multiple helical springs 2, which are evenly arranged around the annular hole of the mounting ring 1 along the circumferential direction. The upper end of the helical spring 2 is fixedly connected to the mounting ring 1, and the lower end is fixedly connected to the bracket. The first fixing part is used to detachably fix the mouth end of the conical flask 15 to the middle of the annular hole of the mounting ring 1.

[0029] Before using the water quality laboratory water quality testing auxiliary device of this utility model to assist in the detection of acidity and alkalinity of water samples, position the mouth end of the conical flask 15 directly below the annular hole of the mounting ring 1. Then, move the conical flask 15 upwards so that the mouth end of the conical flask 15 enters the annular hole of the mounting ring 1. Then, fix the mouth end of the conical flask 15 to the middle of the annular hole of the mounting ring 1 using the first fixing part. At this time, the installation of the conical flask 15 on the water quality laboratory water quality testing auxiliary device of this utility model is completed. At this time, the conical flask 15 is connected to the bracket through the mounting ring 1 and multiple helical springs 2. The lower end of the conical flask 15 is located below the mounting ring 1, and the conical flask 15 can swing on the bracket.

[0030] When using the water quality laboratory auxiliary device described in this invention to assist in the detection of acidity and alkalinity of water samples, the water sample to be tested is added to the conical flask 15. Then, while using an auxiliary tool to push the lower end of the conical flask 15 to shake it, an acidic or alkaline solution is dripped into the conical flask 15. For example, the experimenter can use a wooden stick or rubber rod to push the lower end of the conical flask 15 to shake it. In this way, the conical flask 15 can be shaken while simultaneously dripping an acidic or alkaline solution into it. When using the water quality laboratory auxiliary device described in this invention to perform titration detection of acidity and alkalinity of water samples, there is no need to hold the conical flask 15 to shake it, which reduces the possibility of acidic or alkaline solutions dripping onto the experimenter's hands and reduces the possibility of skin injury.

[0031] In this embodiment, a supporting member and a motor 3 are also included. The motor 3 may be an asynchronous motor of model Y80M1-2. The supporting member is used to abut against the outer side of the lower end of the conical bottle 15. The motor 3 is used to drive the supporting member to make circular motion around the axis of the mounting ring 1. The distance from the end face of the supporting member facing the axis of the mounting ring 1 to the axis of the mounting ring 1 is less than the radius of the lower end of the conical bottle 15.

[0032] After the bottle mouth end of the conical bottle 15 is fixed to the middle of the ring hole of the mounting ring 1 by the first fixing part, the end face of the abutment facing the axis of the mounting ring 1 can abut the outer side of the lower end of the conical bottle 15. Since the distance from the end face of the abutment facing the axis of the mounting ring 1 to the axis of the mounting ring 1 is less than the radius of the lower end of the conical bottle 15, the conical bottle 15 can be in an inclined state at this time.

[0033] Then, the motor 3 drives the supporting member to move in a circular motion around the axis of the mounting ring 1. During this circular motion, the supporting member's bearing direction against the lower outer side of the conical bottle 15 continuously changes, causing the tilt direction of the conical bottle 15 to change continuously, thus allowing the conical bottle 15 to shake. Driving the supporting member in a circular motion via the motor 3 makes it easier to shake the conical bottle 15.

[0034] In this embodiment: the bracket includes a support base and a support ring 4, the lower end of the helical spring 2 is fixed to the upper end of the support ring 4, and the support ring 4 is slidably connected to the support base.

[0035] During the installation of the conical flask 15 on the water quality testing auxiliary device for laboratory use described in this utility model, the support ring 4 is first slid upwards, which drives the mounting ring 1 to move upwards until the distance from the support ring 4 to the upper end of the abutment is greater than the height of the conical flask 15. Then, the conical flask 15 is moved between the support ring 4 and the abutment, so that the mouth end of the conical flask 15 is directly below the annular hole of the mounting ring 1. Then, the conical flask 15 is moved upwards, so that the mouth end of the conical flask 15 is moved into the annular hole of the mounting ring 1. Then, the mouth end of the conical flask 15 can be fixed to the middle of the annular hole of the mounting ring 1 by the first fixing part. With this structure, during the installation of the conical flask 15 on the water quality testing auxiliary device for laboratory use described in this utility model, the conical flask 15 is less likely to hit the abutment, so that the abutment is less likely to interfere with the installation of the conical flask 15.

[0036] In this embodiment: the support base includes a base 5, an upright 6, a crossbar 7, a slider 71, and a second fixing part. The upright 6 is vertically arranged, and its lower end is fixed to the base 5. The crossbar 7 is perpendicular to the upright 6 and has a sliding groove along its vertical direction. One end of the crossbar 7 is fixed to the slider 71, which slides within the sliding groove. The other end of the crossbar 7 is fixed to the support ring 4. The second fixing part is used to fix the height position of the slider 71.

[0037] As the slider 71 slides up and down within the groove, the crossbar 7 and the support ring 4 can slide up and down together with the slider 71. With this structure, the support ring 4 can be slidably connected to the support base. The second fixing part can fix the height of the slider 71, thereby fixing the height of the support ring 4.

[0038] In this embodiment: the crossbar 7 is provided with a second screw hole; the second fixing part includes a threaded rod 8, the threaded rod 8 is arranged vertically, the lower end of the threaded rod 8 is rotatably connected to the base 5, and the threaded rod 8 is screwed into the second screw hole.

[0039] When the threaded rod 8 is rotated, the crossbar 7 can move upward or downward relative to the upright rod 6 under the cooperation of the threaded rod 8 and the second threaded hole, causing the slider 71 to slide upward or downward in the groove. After the threaded rod 8 stops rotating, the height position of the crossbar 7 can be fixed, and the height position of the slider 71 in the groove can be fixed. With this structure, the second fixing part can fix the height position of the slider 71.

[0040] In this embodiment: the upper end of the base 5 is recessed downward to form a rotating groove, and the lower part of the inner sidewall of the rotating groove is recessed to form an annular groove; the second fixing part also includes a rotating rod 81 and a limiting ring 82. The lower end of the threaded rod 8 is fixedly connected to the rotating rod 81, and the rotating rod 81 is rotatably fitted in the rotating groove. The limiting ring 82 protrudes outward from the outer circumference of the lower end of the rotating rod 81, and the limiting ring 82 is located in the annular groove. The limiting ring 82 cooperates with the annular groove.

[0041] Since the lower end of the threaded rod 8 is fixedly connected to the rotating rod 81, and the rotating rod 81 is rotatably fitted into the rotating groove, the lower end of the threaded rod 8 can be rotatably connected to the base 5. Since the limiting ring 82 protrudes outward from the outer circumference of the lower end of the rotating rod 81, and the limiting ring 82 is located within the annular groove, the limiting ring 82 engages with the annular groove. The upper end face of the limiting ring 82 is supported by the inner sidewall of the upper end of the annular groove, preventing the limiting ring 82 from disengaging from the annular groove. That is, when the rotating rod 81 rotates within the rotating groove, the rotating rod 81 will not disengage from the rotating groove, and the threaded rod 8 will not disengage from the base 5 during rotation.

[0042] In this embodiment: a through hole 13 is formed on the side wall of the mounting ring 1. The through hole 13 is arranged along the direction perpendicular to the axis of the mounting ring 1 and penetrates the inner side wall and the outer side wall of the mounting ring 1. The first fixing part includes a first abutting rod 111, a first abutting block 101, a second abutting block 102 and a locking part. The first abutting rod 111 is slidably fitted in the through hole 13. The first abutting block 101 is fixedly connected to one end of the first abutting rod 111 located in the annular hole of the mounting ring 1. The second abutting block 102 is directly opposite to the first abutting block 101 and is fixedly connected to the inner side wall of the annular hole of the mounting ring 1. The locking part is used to lock the first abutting rod 111 in the through hole 13.

[0043] Before fixing the conical bottle 15 in the middle of the ring hole of the mounting ring 1, firstly slide the first abutting rod 111 away from the axis of the mounting ring 1, thereby causing the first abutting block 101 to slide away from the axis of the mounting ring 1, increasing the distance between the first abutting block 101 and the second abutting block 102, so that the bottle mouth end of the conical bottle 15 can be placed between the first clamping block and the second clamping block. Then, slide the first abutting rod 111 towards the axis of the mounting ring 1, thereby causing the first abutting block 101 to slide towards the axis of the mounting ring 1, until the clamping surfaces of the first abutting block 101 and the second abutting block 102 respectively abut against the two opposite side surfaces of the bottle mouth end of the conical bottle 15. Then, use the locking part to lock the position of the first abutting rod 111, and the first fixing part can fix the conical bottle 15.

[0044] When it is necessary to remove the conical flask 15, the locking part is released from the first abutment rod 111, and the first abutment rod 111 is slid in a direction away from the axis of the mounting ring 1. This causes the first abutment block 101 to slide in a direction away from the axis of the mounting ring 1, thereby increasing the distance between the first abutment block 101 and the second abutment block 102, allowing the conical flask 15 to be removed. In this way, the first fixing part can detachably fix the mouth end of the conical flask 15 to the center of the annular hole of the mounting ring 1.

[0045] In this embodiment: a first screw hole is formed on the upper end face of the mounting ring 1, the first screw hole is connected to the upper end face of the mounting ring 1 and the inner side wall of the through hole 13; the locking part includes a bolt 12, the bolt 12 is screwed into the first screw hole, and the lower end of the bolt 12 abuts against the first abutting rod 111.

[0046] When the bolt 12 is rotated, under the cooperation of the bolt 12 and the first screw hole, the bolt 12 can move upward or downward relative to the first abutment rod 111. When the bolt 12 moves downward, the lower end of the bolt 12 can move downward until it abuts the side of the first abutment rod 111, and the bolt 12 can lock the position of the first abutment rod 111. When the bolt 12 moves upward, the lower end of the bolt 12 disengages from the side of the first abutment rod 111, and the bolt 12 can release the position lock of the first abutment rod 111. With this structure, the locking part can lock the first abutment rod 111 in the through hole 13.

[0047] In this embodiment: the output shaft of the motor 3 is coaxial with the mounting ring 1; the supporting member includes a second supporting rod 112, a first connecting rod 91, and a second connecting rod 92. The first connecting rod 91 is perpendicular to the axis of the mounting ring 1, and the second connecting rod 92 is parallel to the axis of the mounting ring 1. One end of the first connecting rod 91 is connected to the output shaft of the motor 3, and the other end of the first connecting rod 91 is fixed to the lower end of the second connecting rod 92. The second supporting rod 112 is parallel to the first connecting rod 91. One end of the second supporting rod 112 away from the axis of the mounting ring 1 is connected to the upper end of the second connecting rod 92. The distance from the end face of the second supporting rod 112 facing the axis of the mounting ring 1 to the axis of the mounting ring 1 is less than the radius of the lower end of the conical bottle 15.

[0048] After the conical flask 15 is installed on the mounting ring 1, the end face of the second abutment rod 112 facing the axis of the mounting ring 1 abuts against the outer side of the lower end of the conical flask 15. Since the distance from the end face of the second abutment rod 112 facing the axis of the mounting ring 1 to the axis of the mounting ring 1 is less than the radius of the lower end of the conical flask 15, the end face of the second abutment rod 112 facing the axis of the mounting ring 1 can push the conical flask 15 so that the conical flask 15 can be in an inclined state. The motor 3 is started, and the motor 3 drives the first connecting rod 91, the second connecting rod 92 and the second abutment rod 112 to rotate, so that the abutment point between the end face of the second abutment rod 112 facing the axis of the mounting ring 1 and the lower end of the conical flask 15 changes continuously, so that the tilting direction of the conical flask 15 changes continuously, so that the conical flask 15 can shake. With this structure, the motor 3 and the supporting member can drive the supporting member to push the conical bottle 15 to shake.

[0049] In this embodiment: the second abutment rod 112 is connected to an arc plate 14 in the direction of the output shaft of the motor 3. The inner arc surface of the arc plate 14 is arranged in the direction of the output shaft of the motor 3, and the inner arc surface of the arc plate 14 abuts against the outer side of the lower part of the conical bottle 15.

[0050] With this structure, the inner arc surface of the arc plate 14 is the end face of the abutment facing the axis of the mounting ring 1. During the circular motion of the abutment, the conical bottle 15 is not easily separated from the arc plate 14, and the conical bottle 15 is not easily separated from the end face of the abutment used to abut the outer side of the lower part of the conical bottle 15.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A water quality laboratory auxiliary device for water quality testing, characterized in that: The device includes a bracket, a mounting ring (1), a helical spring (2), and a first fixing part. There are multiple helical springs (2), which are evenly arranged around the annular hole of the mounting ring (1) along the circumferential direction. The upper end of the helical spring (2) is fixedly connected to the mounting ring (1), and the lower end is fixedly connected to the bracket. The first fixing part is used to detachably fix the bottle mouth end of the conical bottle (15) to the middle of the annular hole of the mounting ring (1). It also includes a support member and a motor (3). The support member is used to support the outer side of the lower end of the conical bottle (15). The motor (3) is used to drive the support member to make a circular motion around the axis of the mounting ring (1). The distance from the end face of the support member facing the axis of the mounting ring (1) to the axis of the mounting ring (1) is less than the radius of the lower end of the conical bottle (15). The bracket includes a support base and a support ring (4). The lower end of the helical spring (2) is fixed to the upper end of the support ring (4). The support ring (4) can slide up and down to connect to the support base.

2. The water quality testing aid for water quality laboratories according to claim 1, characterized in that: The support base includes a base (5), an upright (6), a crossbar (7), a slider (71), and a second fixing part. The upright (6) is vertically arranged, and the lower end of the upright (6) is fixed to the base (5). The crossbar (7) is perpendicular to the upright (6). The upright (6) has a sliding groove along the vertical direction. One end of the crossbar (7) is fixed to the slider (71), and the slider (71) slides in the sliding groove. The other end of the crossbar (7) is fixed to the support ring (4). The second fixing part is used to fix the height position of the slider (71).

3. The water quality testing aid for use in water quality laboratories according to claim 2, characterized in that The crossbar (7) is provided with a second screw hole; the second fixing part includes a threaded rod (8), the threaded rod (8) is arranged vertically, the lower end of the threaded rod (8) is rotatably connected to the base (5), and the threaded rod (8) is screwed into the second screw hole.

4. The auxiliary device for water quality testing in a water quality laboratory according to claim 3, characterized in that: The upper end of the base (5) is recessed downward to form a rotating groove, and the lower part of the inner sidewall of the rotating groove is recessed to form an annular groove; the second fixing part also includes a rotating rod (81) and a limiting ring (82). The lower end of the threaded rod (8) is fixed to the rotating rod (81). The rotating rod (81) is rotatably fitted in the rotating groove. The limiting ring (82) protrudes outward from the outer circumference of the lower end of the rotating rod (81). The limiting ring (82) is located in the annular groove and cooperates with the annular groove.

5. The auxiliary device for water quality testing in a water quality laboratory according to claim 1, characterized in that: The mounting ring (1) has a through hole (13) formed on its side wall. The through hole (13) is arranged along the direction perpendicular to the axis of the mounting ring (1) and penetrates the inner side wall and the outer side wall of the mounting ring (1). The first fixing part includes a first abutting rod (111), a first abutting block (101), a second abutting block (102) and a locking part. The first abutting rod (111) is slidably fitted in the through hole (13). The first abutting block (101) is fixedly connected to one end of the first abutting rod (111) located in the annular hole of the mounting ring (1). The second abutting block (102) is directly opposite to the first abutting block (101) and is fixedly connected to the inner side wall of the annular hole of the mounting ring (1). The locking part is used to lock the first abutting rod (111) in the through hole (13).

6. The water quality testing aid for use in water quality laboratories according to claim 5, characterized in that The mounting ring (1) has a first screw hole on its upper end face, which connects the upper end face of the mounting ring (1) and the inner wall of the through hole (13); the locking part includes a bolt (12), which is screwed into the first screw hole, and the lower end of the bolt (12) abuts against the first abutting rod (111).

7. The auxiliary device for water quality testing in a water quality laboratory according to claim 1, characterized in that: The output shaft of the motor (3) is coaxial with the mounting ring (1); the abutment includes a second abutment rod (112), a first connecting rod (91) and a second connecting rod (92). The first connecting rod (91) is perpendicular to the axis of the mounting ring (1), and the second connecting rod (92) is parallel to the axis of the mounting ring (1). One end of the first connecting rod (91) is connected to the output shaft of the motor (3), and the other end of the first connecting rod (91) is fixed to the lower end of the second connecting rod (92). The second abutment rod (112) is parallel to the first connecting rod (91). The end of the second abutment rod (112) facing away from the axis of the mounting ring (1) is connected to the upper end of the second connecting rod (92). The distance from the end face of the second abutment rod (112) facing the axis of the mounting ring (1) to the axis of the mounting ring (1) is less than the radius of the lower end of the conical bottle (15).

8. The auxiliary device for water quality testing in a water quality laboratory according to claim 7, characterized in that: The second abutment rod (112) is connected to an arc plate (14) facing the output shaft of the motor (3). The inner arc surface of the arc plate (14) is set facing the output shaft of the motor (3), and the inner arc surface of the arc plate (14) abuts against the outer side of the lower part of the conical bottle (15).

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