Pipettor tightness testing device

Abstract

The utility model discloses a pipettor sealing performance testing device, which belongs to the technical field of instrument metering and comprises a base, a wide-mouth reagent bottle is placed on the upper surface of the base, a bottle plug is inserted at the position of a bottle opening of the wide-mouth reagent bottle, water is contained in the wide-mouth reagent bottle, a vacuum meter, an air suction pipe and a testing pipe are inserted on the bottle plug, and the testing pipe is connected with the wide-mouth reagent bottle. One end, positioned in the wide-mouth reagent bottle, of the test tube extends below the water surface; a wide-mouth reagent bottle is arranged to be matched with a vacuum meter, an air suction pipe and a test pipe for use, a pipettor to be detected is connected with the test pipe, and an operation plate is pulled to drive a sliding column to drive a suction cup to move downwards, so that the purpose that the air suction pipe sucks air in the wide-mouth reagent bottle is achieved, a pressure difference is generated in the wide-mouth reagent bottle, and the vacuum meter is used for displaying the pressure; and if no bubble is generated at one end of the test tube penetrating into the water surface within a period of time, the pipettor is good in tightness, so that an accurate tightness test effect is achieved, and the operation is convenient and fast.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of instrument measurement technology, and specifically relates to a pipette tightness testing device. BACKGROUND

[0002] A pipette is a measuring instrument with a certain range of scales, which can suck liquid from a container and move it into another container, such as a liquid adding device, a sample adding gun, a liquid suction device, etc. The pipette is an air piston-based system, and leakage is a common cause of capacity accuracy decline. The pipette is placed in a hot and humid environment for sterilization, and improper use and bumping can easily cause gun body deformation, aging, suction head cone damage, piston and sealing ring pollution, which can all cause leakage, but most of the leakage cannot be observed by the naked eye. Therefore, before capacity verification, the tightness must be checked according to JJG646-2006 "Pipette Verification Regulation". The existing national standard JJG 646-2006 "Pipette Verification Regulation" has been published for a long time, and the equipment for tightness testing in the verification regulation is not clear, which leads to the fact that the tightness testing is not valued or ignored in the pipette verification work, and the unqualified pipette tightness continues to be used, which has a certain impact on the results of physical and chemical analysis tests. Therefore, we propose a pipette tightness testing device. UTILITY MODEL CONTENTS

[0003] The utility model aims at providing a pipette tightness testing device to solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a pipette tightness testing device, which comprises a base, a wide-mouth reagent bottle is placed on the upper surface of the base, a bottle plug is inserted at the bottle opening position of the wide-mouth reagent bottle, water is contained in the wide-mouth reagent bottle, a vacuum gauge, an air suction pipe and a test tube are inserted on the bottle plug, one end of the test tube located in the wide-mouth reagent bottle extends below the water surface, a fixing frame and a bearing shell are fixedly installed on the upper surface of the base, an air suction cylinder is fixedly installed on the fixing frame, the air suction cylinder is in communication with the air suction pipe, a sliding column is slidingly installed on the lower surface of the air suction cylinder, a piston disc is fixedly installed at the top end of the sliding column, the piston disc is slidingly attached to the inner wall of the air suction cylinder, an operation plate is fixedly installed at the bottom end of the sliding column, a double-way screw rod is rotatably installed on the inner wall of the bearing shell, one end of the double-way screw rod extends out of the bearing shell and is fixedly installed with a hand wheel, threaded plates are threadedly installed on the outer surfaces of the two threads of the double-way screw rod, a connecting plate is fixedly installed on the upper surface of the threaded plate, the connecting plate extends out of the bearing shell through the channel formed in the upper surface of the bearing shell and is fixedly installed with a bearing bottom plate, a bandage is fixedly installed at the two ends of the bearing bottom plate, and the two bandages are used in cooperation.

[0005] Adopting the above scheme, the wide-mouth reagent bottle is used in cooperation with the vacuum gauge, the suction tube and the test tube, the to-be-tested pipette is connected with the test tube, the sliding column is driven to move the suction disc downward by pulling the operation plate, the purpose of the suction tube sucking the gas in the wide-mouth reagent bottle is achieved, the pressure difference in the wide-mouth reagent bottle is generated, the pressure is displayed by the vacuum gauge, and the test tube does not generate bubbles at one end of the test tube under the water surface within a period of time, which indicates that the pipette is tightly sealed, and the precise tightness test effect is achieved, the operation is convenient, when the operation plate moves downward to suck the gas, the lock plate is clamped into the lock hole to lock the operation plate, manual operation is not needed to keep the operation plate stable, the operation convenience is improved, the relative movement of the two bearing bottom plates is realized by using the bearing shell in cooperation with the bidirectional screw, different types of pipettes can be placed and used, and the installation and fixation of the pipette are realized by using the band, so that the pipette is prevented from moving and affecting the smooth test.

[0006] As a preferred implementation form, the upper surface of the base is fixedly installed with a limiting ring, and the wide-mouth reagent bottle is inserted into the limiting ring.

[0007] Adopting the above scheme, the wide-mouth reagent bottle is inserted into the limiting ring, the limiting ring can play a bearing limiting effect, and the shaking of the wide-mouth reagent bottle is prevented, so that the use stability is improved.

[0008] As a preferred implementation form, the upper surface of the base is slidably installed with an installation plate, the side surface of the installation plate is fixedly installed with a lock plate, and a lock hole into which the lock plate is inserted is formed in the operation plate.

[0009] Adopting the above scheme, when the operation plate moves downward to suck the gas, the lock plate is inserted into the lock hole, the position of the operation plate can be locked, the locking structure is simple, and the operation is convenient.

[0010] As a preferred implementation form, the lower surface of the installation plate is fixedly installed with a plurality of trapezoidal blocks, the upper surface of the base is formed with a plurality of trapezoidal grooves, and the trapezoidal blocks are slidably installed on the inner walls of the trapezoidal grooves.

[0011] Adopting the above scheme, the trapezoidal blocks slide in the trapezoidal grooves, the movement of the installation plate can be supported and guided, the movement stability of the lock plate can be ensured to be good, and the installation plate can be prevented from sliding off the base, thereby playing a limiting effect.

[0012] As a preferred implementation form, the side surface of the trapezoidal block is fixedly installed with a spring, and the spring is located in the trapezoidal groove and is fixedly installed on the inner wall of the trapezoidal groove at the end away from the trapezoidal block.

[0013] With the above scheme, when the lock plate moves to be staggered with the operation plate, the spring will be deformed, so that the elastic force of the spring can drive the lock plate to quickly reset and insert into the lock hole, improving the convenience of locking.

[0014] As a preferred implementation, the inner wall of the bearing shell is fixedly installed with a plurality of guide rods, and the threaded plate is slidingly installed on the outer surfaces of the guide rods.

[0015] With the above scheme, when the bidirectional screw drives the threaded plate to move, the threaded plate will slide on the surface of the guide rod, so that the setting of the guide rod can have a limiting support effect, improving the movement stability of the threaded plate and preventing shaking.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] The liquid transfer device tightness testing device is used in cooperation with the wide-mouth reagent bottle, the vacuum gauge, the air suction pipe and the test tube, the liquid transfer device to be tested is connected with the test tube, the sliding column is driven to move downward by pulling the operation plate to drive the suction cup, the air suction pipe sucks the gas in the wide-mouth reagent bottle, the pressure difference is generated in the wide-mouth reagent bottle, the vacuum gauge displays the pressure, and if no bubbles are generated at the end of the test tube that is submerged in the water surface within a period of time, it indicates that the liquid transfer device is good in tightness, thereby achieving the precise tightness testing effect and convenient operation.

[0018] The liquid transfer device tightness testing device is used in cooperation with the wide-mouth reagent bottle, the vacuum gauge, the air suction pipe and the test tube, the liquid transfer device to be tested is connected with the test tube, the sliding column is driven to move downward by pulling the operation plate to drive the suction cup, the air suction pipe sucks the gas in the wide-mouth reagent bottle, the pressure difference is generated in the wide-mouth reagent bottle, the vacuum gauge displays the pressure, and if no bubbles are generated at the end of the test tube that is submerged in the water surface within a period of time, it indicates that the liquid transfer device is good in tightness, thereby achieving the precise tightness testing effect and convenient operation. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the utility model;

[0020] Figure 2 It is a structural schematic view of the air suction cylinder section of the utility model;

[0021] Figure 3 It is a structural schematic view of the mounting plate of the utility model;

[0022] Figure 4 It is a structural schematic view of the bearing shell section of the utility model.

[0023] In the figure: 1, base; 2, wide-mouth reagent bottle; 3, bottle plug; 4, vacuum gauge; 5, air suction pipe; 6, test tube; 7, fixing frame; 8, air suction cylinder; 9, sliding column; 10, piston disc; 11, operation plate; 12, mounting plate; 13, locking plate; 14, bearing housing; 15, bidirectional screw; 16, threaded plate; 17, connecting plate; 18, bearing bottom plate; 19, bandage; 20, limiting ring; 21, trapezoidal block; 22, spring; 23, guide rod. DETAILED DESCRIPTION

[0024] Please refer to Figures 1-4 The utility model provides a pipette adhesion test device, including base 1, the upper surface of base 1 places wide-mouth reagent bottle 2, and the bottle mouth position of wide-mouth reagent bottle 2 inserts bottle plug 3, and wide-mouth reagent bottle 2 is filled with water, and bottle plug 3 is inserted with vacuum gauge 4, air suction pipe 5 and test tube 6, and one end of test tube 6 below water surface in wide-mouth reagent bottle 2 extends, and the upper surface of base 1 is fixedly installed with fixing frame 7 and bearing housing 14, and fixing frame 7 is fixedly installed with air suction cylinder 8 on, and air suction cylinder 8 is linked with air suction pipe 5, and the lower surface of air suction cylinder 8 is slidably installed with sliding column 9, and the top end of sliding column 9 is fixedly installed with piston disc 10, and piston disc 10 is slidably attached to the inner wall of air suction cylinder 8, and the bottom end of sliding column 9 is fixedly installed with operation plate 11, and the inner wall of bearing housing 14 is rotatably installed with bidirectional screw 15, and one end of bidirectional screw 15 extends out of bearing housing 14 and is fixedly installed with hand wheel, and the outer surface of the two threads of bidirectional screw 15 is all threadedly installed with threaded plate 16, and the upper surface of threaded plate 16 is fixedly installed with connecting plate 17, and connecting plate 17 extends out of bearing housing 14 through the passage of bearing housing 14 upper surface and is fixedly installed with bearing bottom plate 18, and the both ends of bearing bottom plate 18 are all fixedly installed with bandage 19, and two bandages 19 are used in cooperation.

[0025] The wide-mouth reagent bottle 2 is matched with the vacuum gauge 4, the suction tube 5 and the test tube 6, the pipette to be tested is connected with the test tube 6, the sliding column 9 drives the suction plate to move downward by pulling the operation plate 11, the purpose of the suction tube 5 sucking the gas in the wide-mouth reagent bottle 2 is achieved, the pressure difference in the wide-mouth reagent bottle 2 is generated, the pressure is displayed by the vacuum gauge 4, and the test tube 6 does not generate bubbles at one end of the test tube 6 immersed in the water within a period of time, which indicates that the pipette is tightly sealed, and the precise tightness test effect is achieved, the operation is convenient, when the operation plate 11 moves downward to suck the gas, the lock plate 13 is clamped into the lock hole to lock the operation plate 11, the operation plate 11 does not need to be manually kept stable, the operation convenience is improved, the bidirectional screw 15 is used with the bearing shell 14, the relative movement of the two bearing bottom plates 18 is realized, different types of pipettes can be placed and used, and the installation and fixation of the pipette are realized by the bandage 19, so that the movement of the pipette does not affect the smooth test.

[0026] The upper surface of the base 1 is fixedly installed with a limiting ring 20, the wide-mouth reagent bottle 2 is inserted into the limiting ring 20, the wide-mouth reagent bottle 2 is inserted into the limiting ring 20, the limiting ring 20 can play a bearing limiting effect, preventing the wide-mouth reagent bottle 2 from shaking and improving the stability of use.

[0027] The upper surface of the base 1 is slidably installed with the mounting plate 12, the side surface of the mounting plate 12 is fixedly installed with the lock plate 13, the operation plate 11 is provided with the lock hole for inserting the lock plate 13, the mounting plate 12 is used with the lock plate 13, when the operation plate 11 moves downward to suck the gas, the lock plate 13 is inserted into the lock hole to lock the position of the operation plate 11, the locking structure is simple and convenient to operate.

[0028] The lower surface of the mounting plate 12 is fixedly installed with a plurality of trapezoidal blocks 21, the upper surface of the base 1 is provided with a plurality of trapezoidal grooves, the trapezoidal blocks 21 are slidably installed on the inner walls of the trapezoidal grooves, the trapezoidal blocks 21 slide in the trapezoidal grooves to support and guide the movement of the mounting plate 12, the movement stability of the lock plate 13 is good, and the mounting plate 12 can be prevented from sliding off the base 1, thereby playing a limiting effect.

[0029] The side surface of the trapezoidal block 21 is fixedly installed with the spring 22, the spring 22 is located in the trapezoidal groove and the end of the spring 22 away from the trapezoidal block 21 is fixedly installed on the inner wall of the trapezoidal groove, when the lock plate 13 moves to be staggered with the operation plate 11, the spring 22 will be deformed, therefore the elastic force of the spring 22 can drive the lock plate 13 to quickly reset and be inserted into the lock hole, and the locking convenience is improved.

[0030] The inner wall of the bearing shell 14 is fixedly provided with a plurality of guide rods 23, and the threaded plate 16 is slidingly installed on the outer surface of the guide rods 23. When the bidirectional screw rod 15 rotates to drive the threaded plate 16 to move, the threaded plate 16 will slide on the surface of the guide rod 23. Therefore, the setting of the guide rod 23 can play a limiting support effect, improve the movement stability of the threaded plate 16, and prevent the phenomenon of shaking.

[0031] In use, the bottle plug 3 is pulled out, water is added to the wide-mouth reagent bottle 2, the bottle plug 3 is closed, the wide-mouth reagent bottle 2 is inserted into the limiting ring 20, the air suction pipe 5 is connected with the air suction cylinder 8, the pipette nozzle of the pipette to be tested is connected with the test tube 6, then the position of the bearing bottom plate 18 is adjusted according to the type and length of the pipette, when adjusting, the hand wheel is rotated to drive the bidirectional screw rod 15 to rotate, and then the threaded plate 16 drives the bearing bottom plate 18 to move through the connecting plate 17, and the rotation of the hand wheel is stopped when the pipette is just placed on the two bearing bottom plates 18 at both ends, then the pipette is fixed on the bearing bottom plate 18 by using the bandage 19, then the operating plate 11 is pulled down, the operating plate 11 drives the piston disc 10 to move downward through the sliding column 9, and then the gas in the wide-mouth reagent bottle 2 is extracted through the air suction pipe 5, so that the negative pressure in the wide-mouth reagent bottle 2 is generated and displayed through the vacuum gauge 4. When the operating plate 11 is pulled down, the mounting plate 12 is pulled, the mounting plate 12 drives the lock plate 13 to move to be staggered with the operating plate 11, the mounting plate 12 is released when the operating plate 11 is pulled to the maximum position, the lock plate 13 is driven to insert into the lock hole on the operating plate 11 by the elastic force of the spring 22, the fixation of the operating plate 11 is realized, then a period of time is waited, whether the gas bubble appears at the end of the test tube 6 immersed in the water surface is observed, and if no gas bubble appears, it means that the tightness of the pipette is qualified.

Claims

1. A pipette tightness testing device, characterized by: The utility model provides a kind of water quality testing device, including base (1), the upper surface of base (1) is placed with wide-mouth reagent bottle (2), the bottle mouth position of wide-mouth reagent bottle (2) is inserted with stopper (3), wide-mouth reagent bottle (2) is filled with water, vacuum gauge (4), air suction pipe (5) and test tube (6) are inserted on stopper (3), test tube (6) is extended to below water surface at one end inside wide-mouth reagent bottle (2), the upper surface of base (1) is fixedly installed with fixed rack (7) and bearing shell (14), fixed rack (7) is fixedly installed with air suction cylinder (8), air suction cylinder (8) is communicated with air suction pipe (5), the lower surface of air suction cylinder (8) is slidably installed with sliding column (9), the top of sliding column (9) is fixedly installed with piston disc (10), piston disc (10) is slidably attached to the inner wall of air suction cylinder (8), the bottom of sliding column (9) is fixedly installed with operating plate (11), the inner wall of bearing shell (14) is rotatably installed with two-way screw rod (15), one end of two-way screw rod (15) extends out of bearing shell (14) and is fixedly installed with hand wheel, the outer surface of two threads of two-way screw rod (15) is threadedly installed with threaded plate (16), the upper surface of threaded plate (16) is fixedly installed with connecting plate (17), connecting plate (17) extends out of bearing shell (14) and is fixedly installed with bearing bottom plate (18) by passing the passage of bearing shell (14) upper surface, the both ends of bearing bottom plate (18) are fixedly installed with bandage (19), two bandages (19) are used cooperatively.

2. The pipette adherence test device of claim 1, wherein: The upper surface of base (1) is fixedly installed with limiting ring (20), and wide-mouth reagent bottle (2) is inserted into the inside of limiting ring (20).

3. The pipette adherence verification device of claim 1, wherein: The upper surface of base (1) is slidably installed with mounting plate (12), and the side surface of mounting plate (12) is fixedly installed with lock plate (13); a lock hole is formed in operating plate (11) for the insertion of lock plate (13).

4. The pipette adherence test device of claim 3, wherein: The lower surface of mounting plate (12) is fixedly installed with a plurality of trapezoidal blocks (21), and the upper surface of base (1) is provided with a plurality of trapezoidal grooves; the trapezoidal blocks (21) are slidably installed on the inner walls of the trapezoidal grooves.

5. The pipette adherence test device of claim 4, wherein: The side surface of trapezoidal block (21) is fixedly installed with spring (22), and spring (22) is located inside trapezoidal groove, and one end of spring (22) away from trapezoidal block (21) is fixedly installed on the inner wall of trapezoidal groove.

6. The pipette adherence verification device of claim 1, wherein: The inner wall of bearing shell (14) is fixedly installed with a plurality of guide rods (23), and threaded plate (16) is slidably installed on the outer surfaces of the plurality of guide rods (23).

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