Dropping pipette capable of accurately and quantitatively adding solvent

Abstract

The utility model relates to a dropping pipette, in particular to a dropping pipette capable of accurately and quantitatively adding a solvent. The dropping pipette capable of accurately and quantitatively adding the solvent comprises a capillary tube, a fixing plug, a rubber cap, a first supporting block, a second supporting block, a guide rod, a control rod and the like, the top of the capillary tube is fixedly sleeved with the fixing plug, the rubber cap is arranged in the fixing plug, the lower portion of the rubber cap is inserted into the fixing plug, and the first supporting block and the second supporting block are arranged in the guide rod. A first supporting block is fixedly connected to one side of the upper portion of the capillary tube, a guide rod is fixedly connected to the inner side of the upper portion of the first supporting block in a penetrating mode, a second supporting block is fixedly connected to the other side of the upper portion of the capillary tube, and a control rod is fixedly connected to the inner side of the upper portion of the second supporting block in a penetrating mode. By arranging the rubber cap, the control rod, the pressing sheet, the baffle plate, the bidirectional screw rod and the like, the rubber cap extruded by the baffle plate on the pressing sheet is regulated, so that the amount of discharged solvent is controlled, the dropping error is controlled, and the accuracy of experimental data is effectively improved.

Description

Technical Field

[0001] The utility model relates to a dropper, in particular to a dropper capable of adding a solvent precisely and quantitatively. Background Art

[0002] A dropper is a commonly used instrument in laboratories for precisely measuring and transferring liquids. It is mainly used in chemical experimental operations such as titration analysis. The concept of a dropper involves many aspects such as its structure, type, usage principles, and calibration methods.

[0003] However, the existing dripping devices are mainly divided into hand-operated rubber-tipped droppers and manually opened valve droppers. Due to the influence of two factors, the structure of these two types of droppers and human operation, people cannot accurately control the amount of dripping liquid they need to add, resulting in a large dripping error deviation, which has a certain impact on the experimental data. Utility Model Content

[0004] In order to overcome the shortcoming of being unable to accurately and quantitatively add solvents, the purpose of the utility model is to provide a dropper that can accurately and quantitatively add solvents.

[0005] A dropper for accurately and quantitatively adding a solvent comprises a capillary, a fixed plug, a rubber cap, a first support block, a second support block, a guide rod, a control rod, a pressing piece, an elastic member and a control assembly. The top fixed sleeve of the capillary is provided with a fixed plug, the interior of the fixed plug is provided with a rubber cap, the lower portion of the rubber cap is inserted into the interior of the fixed plug, one side of the upper portion of the capillary is fixedly connected to the first support block, the inner side of the upper portion of the first support block is fixedly connected in an interpenetrating manner, the other side of the upper portion of the capillary is fixedly connected to the second support block, the inner side of the upper portion of the second support block is fixedly connected in an interpenetrating manner, a pressing piece is symmetrically slidably connected between the guide rod and the control rod, an elastic member is fixedly connected between the sides of the two pressing pieces that are close to each other, the elastic member is wrapped around the guide rod, and a control assembly for accurately and quantitatively adding a solvent is provided on the front side of the middle portion of the second support block.

[0006] Optionally, the control component includes a third support block, a baffle, a bidirectional screw and a knob. The third support block is fixedly connected to the front side of the middle of the second support block. The baffle is symmetrically slidably connected to the inside of the third support block. The two baffles are clamped with the inside of the third support block. A bidirectional screw is threadedly connected between the lower parts of the two baffles. Two baffles are inserted through the left and right ends of the bidirectional screw, and the right end of the bidirectional screw is fixedly connected to the knob.

[0007] Optionally, a liquid counter is also included, and the fixed sleeve at the lower part of the capillary is provided with a liquid counter for detecting the amount of solvent falling.

[0008] Optionally, a rubber sleeve is further included, and a rubber sleeve is fixedly provided on the middle part of the pressing piece for protecting fingers.

[0009] Optionally, a rubber pad is provided inside the third support block to facilitate the sliding of the baffle in the third support block.

[0010] Optionally, the control rod is provided with scale lines for accurately controlling the blocking position of the baffle.

[0011] The beneficial effects are: 1. The utility model is provided with components such as a rubber cap, a control rod, a pressing piece, a baffle and a bidirectional screw, so that the baffle is regulated to squeeze the rubber cap on the pressing piece, so that the amount of discharged solvent is controlled, and the dripping error is controlled, which effectively improves the accuracy of the experimental data.

[0012] 2. The utility model provides a rubber sleeve and a pressing sheet, so that fingers can be better protected when people squeeze the pressing sheet. Because the contact area is increased, people can also squeeze the rubber cap through the pressing sheet with less effort.

[0013] 3. The utility model is provided with a liquid recorder, which can better detect errors caused by incorrect operations, thereby further improving the accuracy of the experiment and further enhancing people's user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0015] Figure 2 It is a three-dimensional structural diagram of the capillary tube, fixed plug, rubber cap and other components of the utility model.

[0016] Figure 3 It is a schematic diagram of the three-dimensional structure of the first support block, guide rod, elastic member and other components of the utility model.

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the third support block, baffle, bidirectional screw and other components of the utility model.

[0018] Explanation of the reference numerals: 1: capillary, 2: fixing plug, 3: rubber cap, 4: first support block, 5: second support block, 6: guide rod, 7: control rod, 8: pressing piece, 9: rubber sleeve, 10: elastic part, 11: third support block, 12: baffle, 13: bidirectional screw rod, 14: knob, 15: liquid recorder. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear in this document are based solely on the accompanying drawings and are not intended to limit the present invention.

[0020] Example: A dropper capable of accurately and quantitatively adding a solvent, such as Figures 1-4 As shown, it includes a capillary 1, a fixed plug 2, a rubber cap 3, a first support block 4, a second support block 5, a guide rod 6, a control rod 7, a pressing piece 8 and an elastic member 10. The top of the capillary 1 is fixedly sleeved with a fixed plug 2, and a rubber cap 3 is provided inside the fixed plug 2. The lower part of the rubber cap 3 is inserted into the interior of the fixed plug 2. The first support block 4 is fixedly connected to the rear side of the upper part of the capillary 1, and the guide rod 6 is fixedly connected to the inner side of the upper part of the first support block 4. The second support block 5 is fixedly connected to the front side of the upper part of the capillary 1, and the control rod 7 is fixedly connected to the inner side of the upper part of the second support block 5. The control rod 7 is provided with a scale line for accurately controlling the blocking position of the baffle 12, so that people can accurately control the amount of solvent added. The pressing piece 8 is symmetrically slidably connected between the guide rod 6 and the control rod 7. The elastic member 10 is fixedly connected between the sides of the two pressing pieces 8 that are close to each other. The elastic member 10 surrounds the guide rod 6. The front side of the middle of the second support block 5 is provided with a control component that can accurately control the quantitative addition of solvent.

[0021] like Figure 4 As shown, the control component includes a third support block 11, a baffle 12, a bidirectional screw rod 13 and a knob 14. The third support block 11 is fixedly connected to the front side of the middle of the second support block 5. A rubber pad is provided inside the third support block 11 to facilitate the sliding of the baffle 12 in the third support block 11. The baffle 12 is symmetrically slidably connected to the inside of the third support block 11. The two baffles 12 are clamped with the inside of the third support block 11. A bidirectional screw rod 13 is threadedly connected between the lower parts of the two baffles 12. Two baffles 12 are inserted through the left and right ends of the bidirectional screw rod 13. The right end of the bidirectional screw rod 13 is fixedly connected to the knob 14. Because the two baffles 12 are threadedly connected to the bidirectional screw rod 13 in a symmetrical direction, the two baffles 12 can be moved closer to or away from each other by rotating the knob 14 clockwise or counterclockwise.

[0022] like Figure 1 、 Figure 3 and Figure 4 As shown, a liquid counter 15 is also included. The lower fixed sleeve of the capillary 1 is provided with a liquid counter 15 for detecting the amount of solvent falling. When the solvent falls in the capillary 1, the liquid counter 15 can better detect the error caused by incorrect operation, thereby further improving the accuracy of the experiment.

[0023] like Figure 4 As shown, a rubber sleeve 9 is also included, and a rubber sleeve 9 for protecting fingers is fixedly provided in the middle of the pressing piece 8.

[0024] First, make sure that there is no residual solvent left over from the previous experiment in the device and that it has been cleaned after the last experiment. Then, pinch the rubber sleeve 9 on the pressing piece 8 with one hand and place the bottom of the capillary 1 in the device into the solvent to be added. Be careful to avoid contact with the container when placing it. Then rotate the knob 14 clockwise. Because the baffle 12 and the bidirectional screw 13 are threaded together, rotating the knob 14 clockwise can make the baffles 12 approach each other so that the position of the baffle 12 does not affect the position of people squeezing the pressing piece 8. Then gently squeeze the pressing piece 8 to make it approach each other. The elastic member 10 is compressed and the rubber cap 3 is squeezed, so that the air in the capillary 1 is squeezed out, causing the pressure in the tube to decrease. Then release your hand. Under the action of the pressure difference and surface tension, the larger external atmospheric pressure presses the solvent into the tube to fill the part of the volume that has lost gas. The elastic member 10 is stretched, and the pressing piece 8 is also reset under the action of the elastic member 10. At this point, the capillary 1 is filled with solvent.

[0025] Then, rotate the knob 14 counterclockwise again, and the baffles 12 move away from each other. Then, according to the amount of solvent that people want to discharge, move the position of the baffle 12 to the discharge volume described on the scale line on the control rod 7, and then press the pressing piece 8 so that the pressing pieces 8 are close to each other and squeeze the rubber cap 3. When the pressing pieces 8 are close to each other, the baffle 12 just blocks the pressing piece 8, so that the size of the deformation of the rubber cap 3 is artificially specified, so that the size of the solvent discharged from the capillary 1 is fixed. When the solvent in the capillary 1 is discharged, the liquid recorder 15 can detect how much solvent in the capillary 1 is discharged, so as to prevent errors caused by inaccurate position of the baffle 12 and incorrect operation. When the solvent in the capillary 1 is pipetted, the rubber cap 3 on the fixed plug 2 can be pulled out, so that the fixed plug 2 loses the fixation of the rubber cap 3, and then a certain amount of sterile water is added to the capillary 1 for cleaning to prevent affecting the next experiment. When the cleaning is completed, the rubber cap 3 is aligned with the card slot on the fixed plug 2 and the rubber cap 3 is re-fixed.

[0026] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dropper capable of accurately and quantitatively adding a solvent, characterized by: The capillary tube (1) comprises a capillary tube (1), a fixing plug (2), a rubber cap (3), a first supporting block (4), a second supporting block (5), a guide rod (6), a control rod (7), a pressing piece (8) and an elastic member (10). The fixing plug (2) is fixedly sleeved on the top of the capillary tube (1). A rubber cap (3) is provided inside the fixed plug (2), and the lower part of the rubber cap (3) is inserted into the interior of the fixed plug (2); a first support block (4) is fixedly connected to one side of the upper part of the capillary (1); a guide rod (6) is fixedly connected to the inner side of the upper part of the first support block (4); a second support block (5) is fixedly connected to the other side of the upper part of the capillary (1); a control rod (7) is fixedly connected to the inner side of the upper part of the second support block (5); a pressing plate (8) is symmetrically slidably connected between the guide rod (6) and the control rod (7); an elastic member (10) is fixedly connected between the sides of the two pressing plates (8) that are close to each other; the elastic member (10) is surrounded on the guide rod (6); and a control component for precisely controlling the quantitative addition of solvent is provided on the front side of the middle part of the second support block (5).

2. A dropper capable of accurately and quantitatively adding a solvent according to claim 1, characterized in that: The control component comprises a third support block (11), a baffle (12), a bidirectional screw rod (13) and a knob (14); the front side of the middle portion of the second support block (5) is fixedly connected to the third support block (11); the baffle (12) is symmetrically slidably connected inside the third support block (11); the two baffles (12) are clamped inside the third support block (11); the lower portions of the two baffles (12) are connected to the bidirectional screw rod (13) by threads; the left and right ends of the bidirectional screw rod (13) are both inserted through the two baffles (12); and the right end of the bidirectional screw rod (13) is fixedly connected to the knob (14).

3. A dropper capable of accurately and quantitatively adding a solvent according to claim 2, characterized in that: The invention also comprises a liquid recorder (15). The lower part of the capillary tube (1) is fixedly covered with the liquid recorder (15) for detecting the amount of solvent falling.

4. A dropper capable of accurately and quantitatively adding a solvent according to claim 3, characterized in that: It also includes a rubber sleeve (9), and the middle part of the pressing piece (8) is fixedly provided with a rubber sleeve (9) for protecting fingers.

5. The dropper capable of accurately and quantitatively adding a solvent according to claim 4, characterized in that: A rubber pad is provided inside the third support block (11) to facilitate the sliding of the baffle (12) inside the third support block (11).

6. The dropper capable of accurately and quantitatively adding a solvent according to claim 5, characterized in that: The control rod (7) is provided with scale lines for accurately controlling the blocking position of the baffle (12).

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