A pipette

Abstract

The invention relates to the technical field of liquid transfer, and in particular to a pipette, comprising a ring tube and a driving rod arranged inside the ring tube, an operating button fixedly connected to the driving rod and enabling the pipette to aspirate or discharge liquid, an adjusting component capable of driving the driving rod to reciprocate along its own axis to achieve range adjustment, and a counter component for displaying the range of the pipette, wherein the counter component comprises a mechanical counter, a first driven gear is arranged at the input end of the mechanical counter, the adjusting component comprises a linkage member capable of driving the first driven gear to rotate and an adjusting knob, the adjusting knob is sleeved on the operating button and rotatably connected to the adjusting knob, the adjusting knob is arranged inside the ring tube and can reciprocate along the axial direction of the driving rod to achieve connection and disconnection with the linkage member, and a limiting member for fixing the position of the adjusting knob is arranged on the ring tube, thereby achieving the effect of improving the accuracy of the pipette.

Description

Technical Field

[0001] The invention relates to the technical field of liquid transfer, in particular to a pipette. Background Art

[0002] Currently, a pipette, also called a pipette gun, is a measuring tool that transfers liquid from an original container to another container within a certain range.

[0003] The existing invention patent with the announcement number CN103447104B discloses a pipette, including a rod-shaped housing formed into a handle, the housing having an upper housing part and a lower housing part, an operating element in the form of a cylindrical button extending from the upper housing part at the top, and the operating element is fixedly screwed on the cylindrical lifting rod with a thread in a cover plate. The lifting rod passes through the upper channel of the lead screw in the upper housing part. The lead screw is screwed into the internal thread of the lead screw nut, and the lead screw nut is maintained at a defined position in the upper housing part, and the lead screw nut is fixedly connected to the lifting body fixed in the upper housing part, and the operating element is provided with two radial protrusions radially opposite to each other at the bottom, which protrude outwards and are embedded in the axially extending groove on the inner side of the hollow cylindrical transmission part.

[0004] When the pipette volume is to be adjusted, the operating element is rotated, the spindle is rotated via the spindle driver and the spindle is moved axially due to the threaded connection with the spindle nut fixed in the housing upper part. Here, the spindle driver slides into the hexagonal socket of the operating element. At the same time, the transmission element is rotated via the further radial projection and the counter is adjusted.

[0005] The above-mentioned prior art solution has the following defects: when using the prior art pipette, while moving the operating element along the axial direction of the screw to achieve the action of the pipette sucking or discharging liquid, the operating element may rotate inside the upper part of the shell, which will cause the range of the pipette to change, thereby affecting and reducing the accuracy of the pipette. Summary of the invention

[0006] The purpose of the present invention is to provide a pipette, which achieves the effect of improving the precision of the pipette.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions:

[0008] A pipette comprises a ring tube and a driving rod arranged inside the ring tube, an operating button fixedly connected to the driving rod and enabling the pipette to aspirate or discharge liquid, an adjusting component capable of driving the driving rod to reciprocate along its own axis to achieve range adjustment, and a counter component for displaying the range of the pipette, wherein the counter component comprises a mechanical counter, a first driven gear is arranged at the input end of the mechanical counter, the adjusting component comprises a linkage member capable of driving the first driven gear to rotate and an adjusting knob, the adjusting knob is sleeved on the operating button and rotatably connected to the adjusting knob, the adjusting knob is arranged inside the ring tube and can reciprocate along the axis direction of the driving rod to achieve connection and disconnection with the linkage member, and a limiting member for fixing the position of the adjusting knob is arranged on the ring tube.

[0009] By adopting the above technical solution, when the range of the pipette needs to be adjusted before using the pipette, the adjusting knob is moved along the axial direction of the driving rod until the adjusting knob is connected to the linkage piece; when the adjusting knob is turned, the adjusting knob will drive the first driven gear to rotate through the linkage piece, so that when the range of the pipette is adjusted, the number on the mechanical counter will change; if the range of the pipette does not need to be adjusted, the adjusting knob can be moved to the initial position, at which time the adjusting knob will be separated from the linkage piece, and the rotation of the adjusting knob will not drive the first driven gear to rotate, so that when people press the operation button, even if the adjusting knob is rotated, it will not affect the range of the pipette, and the number displayed on the counter will not change, thereby achieving the effect of improving the accuracy of the pipette.

[0010] In a preferred example, the present invention can be further configured as follows: the linkage member includes an adjusting ring sleeved on the driving rod, a second driven gear and a first driving gear capable of driving the first driven gear to rotate are sleeved on the circumferential surface of the adjusting ring, the adjusting ring is rotatably arranged inside the ring tube, and a second driving gear capable of meshing with the second driven gear is arranged inside the adjusting knob.

[0011] By adopting the above technical solution, when the adjusting knob is moved along the axial direction of the driving rod, the second driving gear on the adjusting knob will engage or disengage with the second driven gear. When engaged, the adjusting knob is rotated, the adjusting knob will drive the adjusting ring to rotate, and the adjusting ring will drive the first driven gear to rotate through the first driving gear.

[0012] In a preferred example, the present invention can be further configured as follows: a driving sleeve is sleeved on the driving rod, and a fixed head is fixedly connected to the end of the driving sleeve close to the operating button, the outer surface of the fixed head has at least one plane, the outer surface of the fixed head abuts against the inner wall of the adjusting ring and can reciprocate along the axis of the driving rod inside the adjusting ring, an abutment block fixedly connected to the driving rod is arranged on the end surface of the driving sleeve away from the operating button, an auxiliary ring is coaxially arranged inside the adjusting ring, the position of the auxiliary ring and the ring tube are relatively fixed, the auxiliary ring is threadedly connected to the driving sleeve, a piston assembly is arranged at the end of the driving rod away from the operating button, and the driving rod can move in a direction away from the piston assembly under the action of the piston assembly.

[0013] By adopting the above technical solution, when the range of the pipette is adjusted by the adjusting knob, the adjusting knob will drive the adjusting ring to rotate together, the outer surface of the fixed head has at least one plane, and the outer surface of the fixed head abuts against the inner wall of the adjusting ring, so the adjusting ring will drive the fixed head to rotate together, the fixed head is fixedly connected to the driving sleeve, so the fixed head will drive the driving sleeve to rotate together, the driving sleeve is threadedly connected to the auxiliary ring, and the positions of the auxiliary ring and the ring tube are relatively fixed, so the driving sleeve will drive the driving rod to move in the direction close to the piston assembly through the abutment block. If the driving sleeve moves in the direction away from the piston assembly, the piston assembly will drive the driving rod to move in the direction away from the piston assembly, that is, the piston assembly will keep the abutment block in abutment with the driving sleeve at all times.

[0014] In a preferred example, the present invention can be further configured as follows: the piston assembly includes a cylinder body and a piston rod arranged inside the cylinder body and coaxially abutting the drive rod, a second elastic member is arranged between the piston rod and the cylinder body to drive the piston rod to move in a direction away from the cylinder body, two abutment rings are arranged along the axial direction of the drive rod, the abutment rings are arranged inside the auxiliary ring, the abutment ring close to the cylinder body is fixedly connected to the auxiliary ring, and the abutment ring away from the cylinder body is slidably connected to the auxiliary ring, and a third elastic member is arranged between the two abutment rings.

[0015] By adopting the above technical solution, when a certain amount of liquid is sucked by the pipette, the operation button is first pressed, and the operation button drives the driving rod and the piston rod to move in the direction close to the cylinder body until the abutment block on the driving rod abuts on the abutment ring away from the cylinder body, and the piston rod discharges the air inside the cylinder body to the outside of the pipette; then the liquid inlet of the pipette is immersed in the liquid, and the operation button is released, and the driving rod and the piston rod move in the direction away from the cylinder body under the elastic force of the second elastic member, so that the liquid enters the inside of the pipette under the action of the external atmospheric pressure; when it is necessary to discharge the liquid inside the pipette to the outside of the pipette, the operation button is pressed, and when the abutment block on the driving rod is grounded on the abutment ring away from the cylinder body, the liquid inside the pipette may not be emptied, and at this time, the operation button is continued to be pressed hard, and the abutment block on the driving rod drives the abutment ring away from the cylinder body to move in the direction close to the cylinder body, and the force of pressing the operation button at this time will be significantly greater than the force of pressing the operation button at the beginning, and when the two abutment rings abut each other, the liquid will be completely discharged from the pipette.

[0016] In a preferred example, the present invention can be further configured as follows: the limit member includes a limit ring arranged between the adjusting knob and the ring tube and fixedly connected to the ring tube, an elastic limit ring is sleeved on the circumferential surface of the adjusting knob, an opening is arranged on the limit ring, the limit ring is embedded in the adjusting knob and the outer diameter of the limit ring is larger than the outer diameter of the adjusting knob, two limit grooves for the limit ring to enter are opened on the inner wall of the limit ring along the axial direction of the driving rod, and when the limit ring is located in the two limit grooves, the second driving gear is meshed or disengaged with the second driven gear.

[0017] By adopting the above technical solution, when the adjusting knob is moved along the axial direction of the driving rod, the limit ring will be pressed into the adjusting knob under the action of the limit ring. After the adjusting knob moves a certain distance, the limit ring will enter the limit groove again under the action of its own elastic force, and at the same time give people's palms a feedback, so that people can determine whether the second driving gear and the second driven gear are in a meshing or disengagement state at this time.

[0018] In a preferred example, the present invention can be further configured as follows: a transmission member is provided between the first driving gear and the first driven gear, the transmission member includes a third gear and a fourth gear that are coaxially fixedly connected, the fourth gear is meshed with the first driven gear and the upper surface abuts against the first driving gear, the third gear is meshed with the first driving gear, a fixing plate fixedly connected to an auxiliary ring is provided on the side of the fourth gear away from the first driving gear, and a first elastic member is provided between the fixing plate and the fourth gear.

[0019] By adopting the above technical solution, during the use of the pipette, the number displayed on the mechanical counter should correspond to the amount of liquid absorbed by the pipette; however, after the pipette has been used for a period of time, there will be an error between the number displayed on the mechanical counter and the amount of liquid absorbed by the pipette. At this time, the third gear and the fourth gear can be pressed in the direction close to the fixed plate to separate the third gear from the first driving gear, so that when the range of the pipette is adjusted, the number on the mechanical counter will not change; when the range of the pipette needs to be calibrated, the number on the mechanical counter is used as a fixed value, and the range of the pipette is gradually changed so that the amount of liquid absorbed by the pipette corresponds to the number on the mechanical counter.

[0020] In a preferred example, the present invention can be further configured as follows: the central rotation of the fourth gear is connected to a connecting rod, and a block abutting the end face of the third gear is sleeved on the connecting rod; one end of the connecting rod away from the fourth gear extends in a direction away from the fourth gear and is connected to a pressing block on the outside of the ring tube.

[0021] By adopting the above technical solution, when the range of the pipette needs to be calibrated, the third gear and the first driving gear can be separated from each other by pressing the pressing block in the direction close to the fixed plate, which makes it convenient for people to calibrate the range of the pipette.

[0022] In a preferred example, the present invention may be further configured as follows: a plurality of notches are evenly provided on the second driving gear along the circumference of the second driving gear.

[0023] By adopting the above technical solution, when the adjusting knob is moved along the axial direction of the driving rod, the notch on the second driving gear can facilitate the second driving gear and the second driven gear to be transformed into a meshing state.

[0024] In a preferred example, the present invention can be further configured as follows: the ring tube includes a handle and a lower part that are threadedly connected to each other, the limit ring is detachably fixedly connected to the handle at a position of the handle away from the lower part, the auxiliary ring is provided with a mounting tenon on the end face close to the lower part, and a mounting plate for fixing the mounting tenon is provided inside the handle near the lower part.

[0025] By adopting the above technical solution, after the multiple components inside the ring tube are connected to each other, the lower part is first sleeved onto the outside of the piston assembly, and then the others are installed inside the handle. At this time, the tenon on the auxiliary ring can make the auxiliary ring detachable and fixed inside the handle. Finally, the handle and the lower part are threaded together to complete the installation of the pipette.

[0026] In a preferred example, the present invention can be further configured as follows: the ring tube includes a handle and a lower part that are threadedly connected to each other, a mounting tube for mounting the Tip head is provided at one end of the lower part away from the handle, a push tube is sleeved on the outer side of the lower part, the end face of the push tube close to the Tip head is in contact with the Tip head, and a push piece is provided on the handle to drive the lower part to move toward or away from the Tip head.

[0027] By adopting the above technical solution, multiple components inside the pipette are installed inside the handle and the lower part, and when the pipette needs to be used to absorb liquid, the Tip head can be installed on the mounting tube. After the Tip head is used, the lower part can be driven by the push-out piece of the handle to move in the direction close to the Tip head, so that the lower part will separate the Tip head from the mounting tube, thus completing the disassembly process of the Tip head, and then the lower part can be moved to the initial position by the pushing piece.

[0028] In summary, the present invention has the following technical effects:

[0029] 1. By providing an adjustment knob that can be connected or disconnected with a linkage, when adjusting the range of the pipette, the adjustment knob is connected to the linkage. After the range adjustment of the pipette is completed, the adjustment knob is separated from the linkage. In this way, when the pipette is used to transfer liquid, even if the adjustment knob is rotated, the range of the pipette will not change, thereby achieving the effect of improving the accuracy of the pipette;

[0030] 2. By setting a transmission member, which is arranged between the first driving gear and the first driven gear, when there is an error between the range of the pipette and the number displayed by the counter, the transmission member can prevent the first driving gear from driving the first driven gear to rotate, so that people can easily calibrate the pipette;

[0031] 3. By providing a second driving gear with a notch, when the adjusting knob is moved along the axial direction of the driving rod, the notch on the second driving gear can facilitate the second driving gear and the second driven gear to be transformed into a meshing state, which makes it convenient for people to adjust the range of the pipette. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is the overall appearance diagram of the present invention;

[0033] Figure 2 is a front cross-sectional view of the present invention;

[0034] Figure 3 yes Figure 2 A partial enlarged view of the middle part;

[0035] Figure 4 It is a partial exploded view of the present invention after the ring tube is hidden;

[0036] Figure 5 is an overall exploded view of the pipette of the present invention (the direction of the arrow in the figure is the installation direction of the pipette when it is assembled);

[0037] Figure 6 It is a top view of the handle of the present invention.

[0038] In the figure, 1, annular tube; 11, lower part; 111, connecting part; 112, mounting tube; 12, handle; 13, snap ring; 14, mounting plate; 15, mounting tenon; 16, O-ring; 17, push tube; 18, ejection member; 181, ejection rod; 182, sixth elastic member; 183, connecting frame; 184, pressing seat; 185, accommodating groove; 2, counter assembly; 21, mechanical counter; 22, first driven gear; 3, operating button; 4, screw assembly; 41, driving rod; 42, abutment block; 43, abutment ring; 44, third elastic member; 5, piston assembly; 51, cylinder body; 52, piston rod; 53, second elastic member; 54, Y-type sealing ring; 6, adjustment Components; 61, adjusting knob; 611, mounting groove; 62, limiting member; 621, limiting ring; 622, limiting ring; 623, limiting groove; 63, linkage member; 631, adjusting ring; 632, transmission member; 6321, third gear; 6322, fourth gear; 6323, first elastic member; 6324, fixing plate; 633, first driving gear; 634, second driven gear; 635, second driving gear; 636, driving sleeve; 637, fixing head; 638, auxiliary ring; 64, clamping block; 65, fifth elastic member; 7, connecting rod; 71, clamping block; 72, pressing plate; 73, pressing block; 74, auxiliary rod; 8, Tip head; 9, mounting ring. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0040] Reference Figure 1 and Figure 2 The present invention provides a pipette, including a ring tube 1, a counter component 2, an operating button 3, a screw component 4, a piston component 5 and an adjusting component 6. The ring tube 1 is vertically arranged and hollow inside. The operating button 3, the screw component 4 and the piston component 5 are arranged inside the ring tube 1 from top to bottom. When the operating button 3 is pressed, the screw component 4 will change the air pressure inside the piston component 5 to complete the process of aspirating and discharging liquid. The counter component 2 is arranged on one side of the screw component 4 and can display the range of the pipette in digital form. The adjusting component 6 is arranged inside the ring tube 1 and can adjust the range of the pipette. During the range adjustment process of the pipette, the numbers displayed by the counter component 2 will change.

[0041] Reference Figure 2 The piston assembly 5 includes a cylinder body 51, a piston rod 52, a second elastic member 53 and a Y-shaped sealing ring 54. The cylinder body 51 is detachably fixed inside the annular tube 1, and the air inlet and outlet of the cylinder body 51 face downward. The piston rod 52 is arranged above the cylinder body 51 and moves up and down in the vertical direction. The piston rod 52 is connected to the screw assembly 4. The second elastic member 53 is arranged between the upper end of the piston rod 52 and the cylinder body 51. The Y-shaped sealing ring 54 is arranged between the piston of the piston rod 52 and the cylinder body 51. When it is necessary to use the pipette to absorb liquid, the piston rod 52 is driven downward by the operating button 3 and the screw assembly 4. At this time, the second elastic member 53 is in a compressed state, and the air inside the cylinder body 51 will be discharged; then the interior of the cylinder body 51 is connected to the interior of the container containing the liquid, and the operating button 3 is released. The piston rod 52 will move upward under the elastic force of the second elastic member 53, the pressure inside the cylinder body 51 will decrease, and the external atmospheric pressure will press the liquid into the pipette, thus completing the liquid absorption process; when the liquid needs to be discharged to the outside of the pipette, press the operating button 3 again.

[0042] Reference Figure 2 and Figure 3 The screw assembly 4 includes a driving rod 41, an abutment block 42, an abutment ring 43 and a third elastic member 44. The driving rod 41 is vertically arranged inside the ring tube 1. The lower end of the driving rod 41 abuts against the upper end of the piston rod 52, and the lower end is fixedly connected to the operation button 3. The abutment block 42 is sleeved on the driving rod 41 and fixedly connected to the driving rod 41. There are two abutment rings 43, which are arranged successively below the abutment block 42 in the vertical direction. The lower abutment ring 43 is relatively fixed to the position of the ring tube 1, and the upper abutment ring 43 is clearance-matched with the driving rod 41. The third elastic member 44 is arranged between the two abutment rings 43, and an embedding groove for the third elastic member 44 to enter is opened on the sides of the two abutment rings 43 close to each other.

[0043] When using the pipette to absorb liquid, press the operating button 3 downward, and the operating button 3 will drive the driving rod 41 and the piston rod 52 to move downward together until the abutment block 42 abuts against the abutment ring 43 above, at which time the distance between the abutment block 42 and the abutment ring 43 away from the cylinder body 51 is the measuring range of the pipette, and the counter assembly 2 displays the volume of liquid that the pipette can absorb when the abutment block 42 moves this distance; when the liquid inside the pipette needs to be completely discharged, press the operating button 3 downward, and when the abutment block 42 abuts against the abutment ring 43 away from the cylinder body 51, the liquid inside the pipette may not be completely discharged, and at this time people continue to press the operating button 3 downward, and the abutment block 42 will drive the abutment ring 43 away from the cylinder body 51 to continue to move downward, and the force required to press the operating button 3 at this time will be greater than the force initially pressed the operating button 3, until the liquid inside the pipette is completely discharged.

[0044] Reference Figure 2 and Figure 3 The counter assembly 2 includes a mechanical counter 21 and a first driven gear 22. The counter is arranged inside the annular tube 1 and is relatively fixed to the annular tube 1. The first driven gear 22 is arranged below the mechanical counter 21 and the axis of the first driven gear 22 is vertical. When the adjustment assembly 6 is used to adjust the range of the pipette, the adjustment assembly 6 will drive the first driven gear 22 to rotate, so that the number displayed on the mechanical counter 21 always corresponds to the volume of liquid that can be absorbed by the pipette.

[0045] In the present invention, the internal structure of the mechanical counter 21 can refer to the Chinese patent publication number CN201017342Y.

[0046] Reference Figure 2 and Figure 3 The adjusting assembly 6 includes an adjusting knob 61, a limiting member 62 and a linkage member 63. The adjusting knob 61 is sleeved on the outside of the operating button 3 and is rotatably connected to the operating button 3. The adjusting knob 61 is arranged inside the ring tube 1 and can move up and down in the vertical direction. The linkage member 63 is arranged between the adjusting knob 61 and the first driven gear 22. When the adjusting knob 61 moves upward to a certain position, the adjusting knob 61 can drive the first driven gear 22 to rotate through the linkage member 63. At this time, when the adjusting knob 61 is rotated, the range of the pipette will change, and the value displayed by the counter assembly 2 will change accordingly; when the adjusting knob 61 moves downward to a certain position, the adjusting knob 61 and the linkage member 63 are separated from each other. When the adjusting knob 61 is rotated, the range of the pipette and the number displayed by the counter assembly 2 will not change; the limiting member 62 is arranged on the ring tube 1 and can limit the two different states of the adjusting knob 61.

[0047] Reference Figure 3 and Figure 4The linkage member 63 includes an adjusting ring 631, a transmission member 632, a first driving gear 633, a second driven gear 634, a second driving gear 635, a driving sleeve 636, a fixed head 637 and an auxiliary ring 638. The driving sleeve 636 is sleeved on the driving rod 41. The driving sleeve 636 is located above the abutment block 42 and abuts against the abutment block 42. The fixed head 637 is sleeved on the upper end of the driving sleeve 636 and is fixedly connected to the driving sleeve 636. The shape of the fixed head 637 is a vertically arranged hexagonal prism. The outer surface of the fixed head 637 abuts against the inner wall of the adjusting ring 631 and can move up and down inside the adjusting ring 631; the auxiliary ring 638 is sleeved on the outer side of the driving sleeve 636 and is threadedly connected to the driving sleeve 636. The position of the auxiliary ring 638 and the ring tube 1 is relatively fixed. The two abutment rings 43 on the driving rod 41 are both located inside the auxiliary ring 638 The lower end surface of the abutment block 42 close to the cylinder body 51 is flush with the lower end surface of the auxiliary ring 638; the adjusting ring 631 is sleeved on the outer side of the auxiliary ring 638 and is rotatably connected with the auxiliary ring 638, the first driving gear 633 is arranged at a position close to the lower end surface of the adjusting ring 631, the transmission member 632 is arranged between the first driving gear 633 and the first driven gear 22, and enables the first driven gear 22 to rotate with the first driving gear 633; ​​the upper end of the adjusting ring 631 extends upward to the inside of the adjusting knob 61, the adjusting ring 631 and the adjusting knob 61 remain coaxial, the second driving gear 635 is coaxially fixed on the inner wall of the adjusting knob 61, and the second driven gear 634 is coaxially fixed on the outer wall of the adjusting ring 631, when the adjusting knob 61 moves up and down, the second driving gear 635 and the second driven gear 634 are meshed or separated with each other.

[0048] When it is necessary to adjust the range of the pipette, the adjusting knob 61 is moved up and down inside the ring tube 1 until the second driving gear 635 and the second driven gear 634 are meshed with each other; the adjusting knob 61 is rotated, and the adjusting knob 61 will drive the adjusting ring 631 to rotate together. The shape of the fixed head 637 is a hexagonal prism, so the adjusting ring 631 will drive the fixed head 637 to rotate together. The fixed head 637 is fixedly connected to the driving sleeve 636, so the fixed head 637 will drive the driving sleeve 636 to rotate together. The driving sleeve 636 is threadedly connected to the auxiliary ring 638, and the auxiliary ring 638 is relatively fixed to the ring tube 1. If the range of the pipette is adjusted to a small size, the driving sleeve 636 will drive the driving rod 41 to move downward through the abutment block 42; if the range of the pipette is adjusted to a large size, the driving sleeve 636 will move upward, and the driving rod 41 and the abutment block 42 will move upward under the action of the piston rod 52 and the second elastic member 53, thus completing the process of adjusting the range of the pipette.

[0049] Reference Figure 3 and Figure 4The limiting member 62 includes a limiting ring 621 and an elastic limiting ring 622. The limiting ring 621 is sleeved on the outer side of the adjusting knob 61. The limiting ring 621 is rotatably connected to the adjusting knob 61 and the adjusting knob 61 can move up and down inside the limiting ring 621. The limiting ring 621 is arranged inside the ring tube 1 and is detachably fixedly connected to the ring tube 1 through the mounting ring 9. An opening is arranged on the limiting ring 622. A mounting groove 611 for the limiting ring 622 to enter is opened on the outer surface of the adjusting knob 61. The limiting ring 622 The inner diameter of the limiting ring 621 is smaller than the outer diameter of the adjusting knob 61, the outer diameter of the limiting ring 622 is larger than the outer diameter of the adjusting knob 61, and a limiting groove 623 for the limiting ring 622 to enter is provided on the inner wall of the limiting ring 621, and there are two limiting grooves 623 in the vertical direction. When the limiting ring 622 is located in the lower limiting groove 623, the second driving gear 635 is separated from the second driven gear 634, and when the limiting ring 622 is located in the upper limiting groove 623, the second driving gear 635 is meshed with the second driven gear 634.

[0050] When the adjusting knob 61 is moved in the vertical direction, in order to facilitate the meshing of the second driving gear 635 and the second driven gear 634 , three notches are evenly formed on the second driving gear 635 along the circumference of the second driving gear 635 .

[0051] Reference Figure 3 and Figure 4The transmission member 632 includes a third gear 6321, a fourth gear 6322, a first elastic member 6323 and a fixing plate 6324. The third gear 6321 is coaxially fixed with the fourth gear 6322. The third gear 6321 is located above the fourth gear 6322. The radius of the third gear 6321 is smaller than the radius of the fourth gear 6322. The fourth gear 6322 is meshed with the first driven gear 22 and the upper surface is in contact with the first driving gear 633. The third gear 6321 is meshed with the first driving gear 633. The fixing plate 6324 is horizontally arranged below the fourth gear 6322 and fixedly connected to the auxiliary ring 638. The first elastic member 6323 is arranged between the fixing plate 6324 and the fourth gear 6322. When the range of the pipette is adjusted, the first active gear 633 will drive the third gear 6321 to rotate, the third gear 6321 will drive the fourth gear 6322 to rotate, and the fourth gear 6322 will drive the first driven gear 22 to rotate, so that when the range of the pipette changes, the indication displayed by the counter component 2 will also change accordingly; if there is an error between the actual volume of liquid that can be absorbed inside the pipette and the indication on the counter component 2, that is, when people need to calibrate the pipette, press the fourth gear 6322 downward to separate the third gear 6321 from the first active gear 633, so that when the range of the pipette is adjusted, the number on the mechanical counter 21 will not change, and then the number on the mechanical counter 21 is used as a fixed value to gradually change the range of the pipette so that the amount of liquid absorbed by the pipette corresponds to the number on the mechanical counter 21.

[0052] Reference Figure 3 and Figure 4 In order to facilitate people to separate the third gear 6321 from the first driving gear 633, a vertical connecting rod 7 is arranged at the center of the third gear 6321, and the lower end of the connecting rod 7 extends to the bottom of the fourth gear 6322. The connecting rod 7 is slidably connected with the third gear 6321 and the fourth gear 6322. A clamping block 71 is arranged on the connecting rod 7, and the lower surface of the clamping block 71 abuts against the upper end surface of the third gear 6321. The upper end of the connecting rod 7 extends upward above the mechanical counter 21. A pressing plate 72 that can move up and down above the mechanical counter 21 is arranged on the main shaft of the mechanical counter 21. The pressing plate 72 is fixedly connected to the upper end of the connecting rod 7. A pressing block 73 is arranged above the ring tube 1, and an auxiliary rod 74 is connected between the pressing block 73 and the pressing plate 72.

[0053] When the pipette needs to be calibrated, the pressing block 73 is moved downward, and the pressing block 73 drives the connecting rod 7 to move downward through the auxiliary rod 74 and the pressing plate 72. During the downward movement of the connecting rod 7, the connecting rod 7 drives the third gear 6321 and the fourth gear 6322 to move downward through the blocking block 71, so that the third gear 6321 can be separated from the first driving gear 633.

[0054] Reference Figure 5 and Figure 6 The ring tube 1 includes a lower part 11, a handle 12 and a clamping ring 13 which are arranged in sequence from bottom to top. The clamping ring 13 is arranged at a position close to the upper end of the handle 12, and the clamping ring 13 extends in a direction away from the handle 12. The longitudinal section of the clamping ring 13 is an arc shape that bulges upward, so that when the operating button 3 on the pipette is pressed downward, the clamping ring 13 can be clamped on the palm; a mounting piece 14 is arranged inside the handle 12, and the mounting piece 14 is arranged at a position close to the lower end surface of the handle 12. A mounting tenon 15 is arranged on the lower end surface of the auxiliary ring 638, and a mounting hole matching the mounting tenon 15 is opened on the mounting piece 14. When the pipette needs to be assembled, the auxiliary ring 638 is assembled. The parts are installed from the upper end of the handle 12 downward into the inside of the handle 12, and the mounting tenon 15 is inserted into the inside of the mounting hole; the lower part 11 also includes a connecting part 111 and a mounting tube 112, the cylinder body 51 inside the piston assembly 5 is arranged inside the connecting part 111, and an O-ring 16 is arranged between the lower end of the cylinder body 51 and the side wall of the connecting part 111, the upper end of the connecting part 111 is inserted upward into the inside of the handle 12 and is threadedly connected to the handle 12, and the mounting tube 112 is vertically fixed on the lower end of the connecting part 111. During the use of the pipette, people can install the Tip head 8 on the mounting tube 112, and the Tip head 8 can facilitate the suction of liquid inside the container.

[0055] Replay Figure 3 In order to make the connection between the handle 12 and the connecting part 111 inside the lower part 11 more stably, and to make the auxiliary ring 638 more stably installed on the mounting plate 14, a clamping block 64 is provided on the outer side of the auxiliary ring 638, and a compressed fifth elastic member 65 is provided between the clamping block 64 and the upper end of the connecting part 111. The fifth elastic member 65 can make the inner end of the mounting tenon 15 press against the lower surface of the mounting plate 14.

[0056] Reference Figure 2 After the Tip head 8 is used, in order to facilitate the removal of the Tip head 8 from the mounting tube 112, a push tube 17 is sleeved on the outer side of the lower part 11, and the push tube 17 is slidably connected to the lower part 11. The lower end surface of the push tube 17 abuts against the Tip head 8, and the handle 12 is provided with a push piece 18 that drives the push tube 17 to reciprocate in the vertical direction.

[0057] Reference Figure 4 and Figure 5 The ejection member 18 includes an ejection rod 181, a sixth elastic member 182, a connecting frame 183 and a pressing seat 184. The ejection rod 181 is vertically arranged below the mechanical counter 21. The upper end of the ejection rod 181 is relatively fixed to the fixing plate 6324 on the auxiliary ring 638. The lower end of the ejection rod 181 is fixedly connected to the push tube 17. The sixth elastic member 182 is sleeved on the ejection rod 181 and is in a stretched state. The connecting frame 183 is arranged inside the handle 12 and extends upward to the top of the snap ring 13. The side of the connecting frame 183 close to the ejection rod 181 is fixedly connected to the upper end of the ejection rod 181. The pressing seat 184 is arranged above the snap ring 13 and can move up and down inside the snap ring 13. The pressing block 73 is located above the pressing seat 184. The upper end surface of the pressing seat 184 is provided with a accommodating groove 185 adapted to the pressing block 73. The pressing seat 184 is fixedly connected to the upper end of the connecting frame 183.

[0058] When it is necessary to separate the Tip head 8 from the mounting tube 112 through the ejection member 18, hold the handle 12 tightly and move the pressing seat 184 downward. The pressing seat 184 will drive the connecting frame 183 to move downward together. The connecting frame 183 is fixedly connected to the ejection rod 181. The ejection rod 181 and the fixing plate 6324 on the auxiliary ring 638 are relatively fixed in position. Therefore, the ejection rod 181 will drive the push tube 17 to move downward, so that the push tube 17 can separate the Tip head 8 from the mounting tube 112. In the process of the ejection rod 181 moving downward, the ejection rod 181 will drive the auxiliary ring 638 to move up and down inside the handle 12 through the fixing plate 6324; then the push tube 17 will return to its initial position under the action of the fifth elastic member 65, the ejection rod 181 and the sixth elastic member 182.

[0059] In the present invention, the first elastic member 6323, the second elastic member 53, the third elastic member 44, the fourth elastic member, the fifth elastic member 65 and the sixth elastic member 182 are preferably springs, and other elastic members having the same effect are still applicable.

[0060] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A pipette, comprising a ring tube (1) and a driving rod (41) arranged inside the ring tube (1), an operating button (3) fixedly connected to the driving rod (41) and enabling the pipette to aspirate or discharge liquid, an adjusting component (6) capable of driving the driving rod (41) to reciprocate along its axis to achieve range adjustment, and a counter component (2) for displaying the range of the pipette, characterized in that: The counter assembly (2) comprises a mechanical counter (21), the input end of the mechanical counter (21) is provided with a first driven gear (22), and the adjustment assembly (6) comprises a linkage member (63) capable of driving the first driven gear (22) to rotate and an adjustment knob (61); The linkage member (63) comprises an adjusting ring (631) sleeved on the driving rod (41); a second driven gear (634) and a first driving gear (633) capable of driving the first driven gear (22) to rotate are sleeved on the circumferential surface of the adjusting ring (631); the adjusting ring (631) is rotatably arranged inside the ring tube (1); a second driving gear (635) capable of meshing with the second driven gear (634) is arranged inside the adjusting knob (61); and a plurality of notches are evenly arranged on the second driving gear (635) along the circumference of the second driving gear (635); The adjusting knob (61) is sleeved on the operating button (3) and is rotatably connected to the linkage member (63). The adjusting knob (61) is arranged inside the ring tube (1) and can reciprocate along the axial direction of the driving rod (41) to achieve connection and disconnection with the linkage member (63). A stopper (62) is arranged on the ring tube (1) to fix the position of the adjusting knob (61). The limiting member (62) comprises a limiting ring (621) arranged between the adjusting knob (61) and the annular tube (1) and fixedly connected to the annular tube (1); a limiting ring (622) having elasticity is sleeved on the circumferential surface of the adjusting knob (61); an opening is arranged on the limiting ring (622); the limiting ring (622) is embedded in the adjusting knob (61) and the outer diameter of the limiting ring (622) is larger than the outer diameter of the adjusting knob (61); two limiting grooves (623) for the limiting ring (622) to enter are arranged on the inner wall of the limiting ring (621) along the axial direction of the driving rod (41); when the limiting ring (622) is located in the two limiting grooves (623), the second driving gear (635) is meshed with or separated from the second driven gear (634).

2. A pipette according to claim 1, characterized in that: The driving rod (41) is sleeved with a driving sleeve (636). The end of the driving sleeve (636) close to the operating button (3) is fixedly connected to a fixing head (637). The outer surface of the fixing head (637) has at least one plane. The outer surface of the fixing head (637) abuts against the inner wall of the adjusting ring (631) and can reciprocate along the axis of the driving rod (41) inside the adjusting ring (631). An abutting block (42) fixedly connected to the driving rod (41) is arranged on the end surface of the driving sleeve (636) away from the operating button (3). An auxiliary ring (638) is coaxially rotatably arranged inside the adjusting ring (631). The auxiliary ring (638) and the ring tube (1) are relatively fixed in position. The auxiliary ring (638) is threadedly connected to the driving sleeve (636). The end of the driving rod (41) away from the operating button (3) is provided with a piston assembly (5). Under the action of the piston assembly (5), the driving rod (41) can move in a direction away from the piston assembly (5).

3. A pipette according to claim 2, characterized in that: The piston assembly (5) comprises a cylinder body (51) and a piston rod (52) arranged inside the cylinder body (51) and coaxially abutting against the drive rod (41); a second elastic member (53) is arranged between the piston rod (52) and the cylinder body (51) for driving the piston rod (52) to move in a direction away from the cylinder body (51); two abutment rings (43) are arranged along the axial direction of the drive rod (41); the abutment rings (43) are arranged inside the auxiliary ring (638); the abutment ring (43) close to the cylinder body (51) is fixedly connected to the auxiliary ring (638); the abutment ring (43) away from the cylinder body (51) is slidably connected to the auxiliary ring (638); and a third elastic member (44) is arranged between the two abutment rings (43).

4. A pipette according to claim 1, characterized in that: A transmission member (632) is provided between the first driving gear (633) and the first driven gear (22). The transmission member (632) comprises a third gear (6321) and a fourth gear (6322) which are coaxially fixedly connected. The fourth gear (6322) is meshed with the first driven gear (22) and its upper surface is in contact with the first driving gear (633). The third gear (6321) is meshed with the first driving gear (633). A fixing plate (6324) fixedly connected to an auxiliary ring (638) is provided on a side of the fourth gear (6322) away from the first driving gear (633). A first elastic member (6323) is provided between the fixing plate (6324) and the fourth gear (6322).

5. A pipette according to claim 4, characterized in that: The fourth gear (6322) is centrally rotatably connected to a connecting rod (7), on which a clamping block (71) is sleeved and abuts against the end surface of the third gear (6321). One end of the connecting rod (7) away from the fourth gear (6322) extends in a direction away from the fourth gear (6322) and is connected to a pressing block (73) on the outside of the ring tube (1).

6. A pipette according to claim 1, characterized in that: The ring tube (1) comprises a handle (12) and a lower part (11) which are threadedly connected to each other, a limiting ring (621) is detachably fixedly connected to the handle (12) at a position where the handle (12) is away from the lower part (11), a mounting tenon (15) is arranged on the end surface of the auxiliary ring (638) close to the lower part (11), and a mounting plate (14) for fixing the mounting tenon (15) is arranged inside the handle (12) at a position close to the lower part (11).

7. A pipette according to claim 1, characterized in that: The ring tube (1) comprises a handle (12) and a lower part (11) which are threadedly connected to each other. An end of the lower part (11) away from the handle (12) is provided with a mounting tube (112) for mounting a tip head (8). A push tube (17) is sleeved on the outer side of the lower part (11). The end surface of the push tube (17) close to the tip head (8) abuts against the tip head (8). The handle (12) is provided with a push piece (18) for driving the lower part (11) to move toward or away from the tip head (8).

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