CN212237350U

CN212237350U - Liquid transfer device

Info

Publication number: CN212237350U
Application number: CN202020973463.7U
Authority: CN
Inventors: 郭雷; 王宪华; 吴永杰
Original assignee: Dalong Xingchuang Experimental Instrument Beijing Co ltd
Current assignee: Dalong Xingchuang Experimental Instrument Beijing Co ltd
Priority date: 2020-06-01
Filing date: 2020-06-01
Publication date: 2020-12-29
Anticipated expiration: 2030-06-01

Abstract

The utility model relates to the technical field of liquid transfer, in particular to a pipette, which comprises a ring pipe, a driving rod arranged inside the ring pipe, an operating button fixedly connected with the driving rod and used for enabling the pipette to realize liquid suction or liquid discharge, an adjusting component capable of driving the driving rod to reciprocate along the axis of the adjusting component to realize range adjustment and a counter component used for displaying the range of the pipette, wherein the counter component comprises a mechanical counter, the input end of the mechanical counter is provided with a first driven gear, the adjusting component comprises a linkage part and an adjusting knob capable of driving the first driven gear to rotate, the adjusting knob is sleeved on the operating button and rotatably connected with the adjusting knob, the adjusting knob is arranged inside the ring pipe and can reciprocate along the axis direction of the driving rod to realize connection and disconnection with the linkage part, and the ring pipe is provided with a limiting part for fixing the position of the adjusting knob, the effect of improving pipettor precision has been reached.

Description

Liquid transfer device

Technical Field

The utility model belongs to the technical field of the liquid transfer technique and specifically relates to a pipettor is related to.

Background

At present, a liquid transfer device, also called a liquid transfer gun, is a metering tool for transferring liquid from an original container to another container within a certain range.

The prior utility model publication No. CN103447104B discloses a pipette, comprising a housing having a rod-like shape formed as 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 upper part, the operating element being screwed on a cylindrical lifting rod with a screw thread in a cover plate. The lifting rod passes through a passage in the upper part of the threaded spindle in the housing upper part. The spindle is screwed into the internal thread of a spindle nut which is held in a defined position in the housing upper part, which is fixedly connected to a lifting body fixed in the housing upper part, and the operating element is provided in the lower part with two radial projections which are diametrically opposite one another and project outwards, which engage in axially extending grooves on the inside of the hollow cylindrical transmission part.

When the range of the pipette is to be adjusted, the operating element is rotated, the screw is rotated by the screw driver and is axially displaced by the threaded connection with the screw nut fixed in the housing upper part. In this case, the spindle driver slides into the internal hexagon of the operating element. At the same time, the transmission member is rotated and the counter is adjusted by means of the further radial projection.

The above prior art solutions have the following drawbacks: when the pipettor in the prior art is used, the operation element is moved along the axial direction of the screw rod to realize the action of sucking or discharging liquid by the pipettor, and meanwhile, the operation element possibly rotates in the upper part of the shell, so that the measuring range of the pipettor is changed, and the precision of the pipettor is further influenced and reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a pipettor has reached the effect that improves the pipettor precision.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a pipettor, including the ring canal and set up the actuating lever inside the ring canal, with actuating lever fixed connection and make the pipettor realize the operating button of imbibition or flowing back, can drive the actuating lever along self axis reciprocating motion realize the adjusting part of range regulation and be used for showing the counter subassembly of pipettor range, the counter subassembly includes mechanical counter, mechanical counter's input is provided with first driven gear, adjusting part is including driving first driven gear pivoted link member and adjust knob, adjust knob cover establish on operating button and be connected with adjust knob rotation, adjust knob sets up inside the ring canal and can realize the connection and the disconnection with the link member along the axis direction reciprocating motion of actuating lever, be provided with on the ring canal and carry out fixed locating part to adjust knob's position.

By adopting the technical scheme, when the range of the liquid transfer device needs to be adjusted before the liquid transfer device is used, the adjusting knob is moved along the axial direction of the driving rod until the adjusting knob is connected with the linkage piece; the adjusting knob is rotated, and the adjusting knob can drive the first driven gear to rotate through the linkage piece, so that the number on the mechanical counter can be driven to change when the measuring range of the pipettor is adjusted; if when the range of not needing to pipettor is adjusted, can remove adjust knob to initial position, adjust knob can separate with the linkage this moment, and adjust knob rotates and can not drive first driven gear and rotate, and when people pressed operating button like this, even adjust knob takes place to rotate the range that can not influence the pipettor yet, the digit that shows on the counter can not change yet, has reached the effect that improves the pipettor precision.

The utility model discloses can further configure to in a preferred example, the linkage establishes the adjustable ring on the actuating lever including the cover, and the cover is equipped with the second driven gear and can drives first driven gear pivoted first driving gear on the global of adjustable ring, and the adjustable ring rotates and sets up inside the ring canal, the inside second driving gear that can mesh with second driven gear that is provided with of adjust knob.

Through adopting above-mentioned technical scheme, when removing adjust knob along the axis direction of actuating lever, the last second driving gear of adjust knob can with second driven gear meshing or separation, when meshing mutually, rotatory adjust knob, adjust knob can drive the adjustable ring and rotate, the adjustable ring will drive first driven gear through first driving gear and rotate.

The utility model discloses can further configure to in a preferred example, the cover is equipped with the drive cover on the actuating lever, the drive cover is close to operating button's one end fixedly connected with fixed head, the surface of fixed head has a plane at least, the surface of fixed head and the inner wall looks butt of adjustable ring and can be at the inside axis reciprocating motion along the actuating lever of adjustable ring, be provided with the butt piece with actuating lever fixed connection on the terminal surface of keeping away from operating button of drive cover, the inside coaxial rotation of adjustable ring is provided with the auxiliary ring, auxiliary ring and ring pipe position relatively fixed, auxiliary ring and drive cover threaded connection, the one end that operating button was kept away from to the actuating lever is provided with piston assembly and the actuating lever can be under piston assembly's effect to the direction removal of keeping away from.

Through adopting above-mentioned technical scheme, when adjusting knob adjusts the range of pipettor, adjusting knob can drive the adjustable ring and rotate together, the surface of fixed head has a plane at least, and the surface of fixed head and the inner wall looks butt of adjustable ring, so the adjustable ring can drive the fixed head and rotate together, fixed head and drive cover fixed connection, so the fixed head can drive the driving sleeve and rotate together, driving sleeve and supplementary ring threaded connection, the position relatively fixed of supplementary ring and ring pipe, so the driving sleeve can drive the direction that the actuating lever is close to piston assembly through the butt piece and remove, if the driving sleeve when removing to the direction of keeping away from piston assembly, piston assembly can drive the actuating lever and remove to the direction of keeping away from piston assembly, piston assembly can make the butt piece keep the butt with the driving sleeve all the time promptly.

The utility model discloses can further configure to in a preferred example, piston assembly includes the cylinder body and sets up inside the cylinder body and with the piston rod of the coaxial butt of actuating lever, be provided with the second elastic component that drives the piston rod and remove to the direction of keeping away from the cylinder body between piston rod and the cylinder body, be provided with two butt rings along the axis direction of actuating lever, the butt ring sets up inside supplementary ring, be close to the butt ring and the supplementary ring fixed connection of cylinder body, keep away from the butt ring and the supplementary ring sliding connection of cylinder body, be provided with the third elastic component between two butt rings.

By adopting the technical scheme, when a certain amount of liquid is sucked by using the liquid transfer device, firstly, the operating button is pressed to drive the driving rod and the piston rod to move towards the direction close to the cylinder body until the abutting block on the driving rod abuts against the abutting ring far away from the cylinder body, and the piston rod can discharge air in the cylinder body to the outer side of the liquid transfer device; then, a liquid inlet of the liquid transfer device is immersed into liquid, the operating button is loosened, the driving rod and the piston rod can move towards the direction far away from the cylinder body under the action of the elastic force of the second elastic piece, and therefore the liquid can enter the liquid transfer device under the action of the external atmospheric pressure; when need discharge the pipettor outside with the inside liquid of pipettor, press operating button, butt piece ground on the actuating lever connects when keeping away from the butt ring of cylinder body on, the inside liquid of pipettor probably can't the evacuation, continue to press operating button hard this moment, butt piece on the actuating lever can drive the butt ring of keeping away from the cylinder body and move to the direction that is close to the cylinder body, the dynamics of pressing operating button this moment can obviously be greater than the dynamics that begins to press operating button, when two butt ring mutual butts, liquid can be discharged in the pipettor completely.

The utility model discloses can further configure to in a preferred example, the locating part including set up between adjust knob and ring pipe and with ring pipe fixed connection's spacing ring, the cover is equipped with and has elastic spacing collar on adjust knob's global, be provided with the opening on the spacing collar, the spacing collar is embedded into adjust knob inside and the external diameter of spacing collar is greater than adjust knob's external diameter, set up two spacing grooves that supply the spacing collar to get into on the inner wall of spacing ring along the axis direction of actuating lever, when the spacing collar is located two spacing inslot portions, second driving gear and second driven gear meshing or separation.

Through adopting above-mentioned technical scheme, when removing adjust knob along the axis direction of actuating lever, the spacing collar can be impressed adjust knob inside under the effect of spacing ring, adjust knob removes one end distance after, the spacing collar can enter into spacing inslot portion again under the effect of self elasticity, can give feedback of people's palm simultaneously, and people just so can confirm that second driving gear and second driven gear are in meshing or separation state this moment.

The utility model discloses can further configure to in a preferred example, be provided with the driving medium between first driving gear and the first driven gear, the driving medium includes coaxial fixed connection's third gear and fourth gear, the fourth gear meshes with first driven gear mutually and upper surface and first driving gear looks butt, the third gear meshes with first driving gear mutually, one side that first driving gear was kept away from to the fourth gear is provided with the fixed plate with supplementary ring fixed connection, be provided with first elastic component between fixed plate and the fourth gear.

By adopting the technical scheme, in the using process of the liquid transfer device, the number displayed by the mechanical counter corresponds to the amount of liquid sucked by the liquid transfer device; however, after the pipettor is used for a period of time, errors can occur between the numbers displayed by the mechanical counter and the amount of liquid sucked by the pipettor, and at the moment, the third gear and the fourth gear can be pressed in the direction close to the fixing plate to separate the third gear from the first driving gear, so that the numbers on the mechanical counter cannot be changed when the measuring range of the pipettor is adjusted; when the measuring range of the liquid transfer device needs to be calibrated, the number on the mechanical counter is used as a fixed value, the measuring range of the liquid transfer device is gradually changed, and the amount of liquid sucked by the liquid transfer device corresponds to the number on the mechanical counter.

The utility model discloses can further configure to in a preferred example, the center of fourth gear rotates and is connected with the connecting rod, and the cover is equipped with the fixture block with the terminal surface looks butt of third gear on the connecting rod, and the one end that the fourth gear was kept away from to the direction of keeping away from the fourth gear to the connecting rod extend and be connected with the pressing block in the ring canal outside.

Through adopting above-mentioned technical scheme, when the range of need to pipettor was calibrated, through pressing the pressing block to the direction that is close to the fixed plate, can make third gear and first driving gear alternate segregation, can make things convenient for people to calibrate the range of pipettor like this.

The utility model discloses can further configure to in a preferred example, evenly seted up a plurality of breachs on the second driving gear along the circumference of second driving gear.

Through adopting above-mentioned technical scheme, when the axis direction along the actuating lever removed adjust knob, the breach on the second driving gear can make things convenient for second driving gear and second driven gear to turn into the engaged state.

The utility model discloses can further configure to in a preferred example, the ring canal includes mutual threaded connection's handle and lower part, and the spacing ring can dismantle fixed connection with the handle in the position that the lower part was kept away from to the handle, and the auxiliary ring is provided with the installation tenon on being close to the terminal surface of lower part, and the inside position that is close to the lower part of handle is provided with the installation piece that is used for the fixed mounting tenon.

Through adopting above-mentioned technical scheme, after accomplishing with a plurality of subassemblies interconnect of ring inside, at first establish the piston assembly outside with the lower part cover, then install inside the handle with other, the tenon on the supplementary ring can make supplementary ring can dismantle and fix inside the handle this moment, is at last can accomplish the installation of pipettor with handle and lower part threaded connection together.

The utility model discloses can further configure to in a preferred example, the ring canal includes mutual threaded connection's handle and lower part, and the one end that the handle was kept away from to the lower part is provided with the installation pipe that is used for installing the Tip head, and the outside cover of lower part is equipped with the ejector sleeve, and the ejector sleeve is close to the terminal surface and the Tip head looks butt of Tip head, is provided with the propelling movement piece that drives the lower part and remove to the direction that is close to or keeps away from the Tip head on the handle.

Through adopting above-mentioned technical scheme, install inside handle and the lower part with a plurality of subassemblies of pipettor to when needing to use the pipettor to absorb liquid, with the Tip head install the installation on the pipe can, after the Tip head is used and ends, can drive the lower part and remove to the direction that is close to the Tip head through the ejecting piece of handle, the lower part can make Tip head and installation pipe separation like this, just so accomplished the dismantlement process of Tip head, later the rethread impeller with the lower part remove initial position can.

To sum up, the utility model discloses following technological effect has:

1. the adjusting knob which can be connected or disconnected with the linkage piece is arranged, so that the adjusting knob is connected with the linkage piece when the range of the liquid transfer device is adjusted, and the adjusting knob is separated from the linkage piece after the range of the liquid transfer device is adjusted, so that the range of the liquid transfer device is not changed even if the adjusting knob rotates when the liquid transfer device is used for transferring liquid, and the effect of improving the precision of the liquid transfer device is achieved;

2. the transmission part is arranged between the first driving gear and the first driven gear, and when the measuring range of the pipettor and the number displayed by the counter have errors, the first driving gear cannot drive the first driven gear to rotate through the transmission part, so that people can conveniently calibrate the pipettor;

3. through having set up the second driving gear who has the breach, when the axis direction along the actuating lever removed adjust knob, breach on the second driving gear can make things convenient for second driving gear and second driven gear to turn into the engaged state, can make things convenient for people to adjust the range of pipettor like this.

Drawings

FIG. 1 is an overall view of the present invention;

fig. 2 is a front sectional view of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a partial exploded view of the present invention after the grommet is hidden;

fig. 5 is an overall exploded view of the pipette of the present invention (the arrow direction in the figure is the mounting direction of the pipette when assembled);

fig. 6 is a top view of the handle of the present invention.

In the figure, 1, a ring pipe; 11. a lower portion; 111. a connecting portion; 112. installing a pipe; 12. a handle; 13. a snap ring; 14. mounting a sheet; 15. installing a tenon; 16. an O-shaped ring; 17. pushing the tube; 18. pushing out the piece; 181. pushing out the rod; 182. a sixth elastic member; 183. a connecting frame; 184. a pressing seat; 185. a containing groove; 2. a counter assembly; 21. a mechanical counter; 22. a first driven gear; 3. an operation button; 4. a screw assembly; 41. a drive rod; 42. a butting block; 43. a butting ring; 44. a third elastic member; 5. a piston assembly; 51. a cylinder body; 52. a piston rod; 53. a second elastic member; 54. a Y-shaped seal ring; 6. an adjustment assembly; 61. adjusting a knob; 611. mounting grooves; 62. a limiting member; 621. a limiting ring; 622. a limiting ring; 623. a limiting groove; 63. a linkage member; 631. an adjusting ring; 632. a transmission member; 6321. a third gear; 6322. a fourth gear; 6323. a first elastic member; 6324. a fixing plate; 633. a first drive gear; 634. a second driven gear; 635. a second driving gear; 636. a drive sleeve; 637. a fixed head; 638. an auxiliary ring; 64. a clamping block; 65. a fifth elastic member; 7. a connecting rod; 71. a clamping block; 72. a pressing plate; 73. a pressing block; 74. an auxiliary lever; 8. a Tip head; 9. and (7) installing a ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, the utility model provides a pipettor, including ring pipe 1, counter subassembly 2, operating button 3, screw rod subassembly 4, piston assembly 5 and adjusting part 6, ring pipe 1 is vertical to be set up and inside cavity, operating button 3, screw rod subassembly 4 and piston assembly 5 set gradually inside ring pipe 1 from the top down, press operating button 3, screw rod subassembly 4 can make the inside atmospheric pressure of piston assembly 5 change and then accomplish the process of imbibition and flowing back, counter subassembly 2 sets up in one side of screw rod subassembly 4 and can show with the range of pipettor with the form of figure, adjusting part 6 sets up inside ring pipe 1 and can adjust the range of pipettor, and in the range adjustment process of pipettor, the figure that counter subassembly 2 shows can change.

Referring to fig. 2, the piston assembly 5 includes a cylinder 51, a piston rod 52, a second elastic member 53 and a Y-shaped sealing ring 54, the cylinder 51 is detachably fixed inside the loop pipe 1, an inlet and an outlet of the cylinder 51 face downward, the piston rod 52 is disposed above the cylinder 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 disposed between an upper end of the piston rod 52 and the cylinder 51, and the Y-shaped sealing ring 54 is disposed between the piston of the piston rod 52 and the cylinder 51. When the liquid is required to be sucked by using the pipette, the piston rod 52 is driven to move downwards by the operating button 3 and the screw assembly 4, at this time, the second elastic piece 53 is in a compressed state, and air in the cylinder 51 is discharged; then, the interior of the cylinder body 51 is communicated with the interior of a container for containing liquid, the operation button 3 is loosened, the piston rod 52 moves upwards under the action of the elastic force of the second elastic piece 53, the pressure intensity in the cylinder body 51 is reduced, and the liquid is pressed into the liquid transfer device by the external atmospheric pressure, so that the liquid suction process is completed; when the liquid needs to be discharged to the outside of the pipette, the operation button 3 may be pressed again.

Referring to fig. 2 and 3, the screw assembly 4 includes a driving rod 41, a butting block 42, a butting ring 43 and a third elastic member 44, the driving rod 41 is vertically disposed inside the collar 1, a lower end of the driving rod 41 abuts against an upper end of the piston rod 52, the lower end is fixedly connected to the operating button 3, the butting block 42 is sleeved on the driving rod 41 and is fixedly connected to the driving rod 41, two butting rings 43 are disposed, the two butting rings 43 are sequentially disposed below the butting block 42 along the vertical direction, the butting ring 43 below is relatively fixed to the collar 1, the butting ring 43 above is in clearance fit with the driving rod 41, the third elastic member 44 is disposed between the two butting rings 43, and an insertion groove for the third elastic member 44 to enter is formed on a side surface of the two butting rings 43 close to each other.

When a liquid is sucked by using a pipette, the operating button 3 is pressed downwards, the operating button 3 drives the driving rod 41 and the piston rod 52 to move downwards together until the abutting block 42 abuts against the upper abutting ring 43, the distance between the abutting block 42 and the abutting ring 43 far away from the cylinder body 51 is the range of the pipette, and the counter assembly 2 displays that the abutting block 42 moves the range of the liquid which can be sucked by the pipette; when the liquid in the pipette needs to be completely discharged, the operating button 3 is pressed downwards, when the abutting block 42 abuts on the abutting ring 43 far away from the cylinder body 51, the liquid in the pipette may not be completely discharged, at this time, people continue to press the operating button 3 downwards, the abutting block 42 drives the abutting ring 43 far away from the cylinder body 51 to continue moving downwards, and the force required for pressing the operating button 3 at this time is greater than the force for initially pressing the operating button 3 until the liquid in the pipette is completely discharged.

Referring to fig. 2 and 3, the counter assembly 2 includes a mechanical counter 21 disposed inside the loop pipe 1 and fixed in position relative to the loop pipe 1, and a first driven gear 22 disposed below the mechanical counter 21 with an axis of the first driven gear 22 vertical. When the adjusting assembly 6 is used for adjusting the measuring range of the pipette, the adjusting assembly 6 drives the first driven gear 22 to rotate, so that the number displayed on the mechanical counter 21 always corresponds to the volume of liquid which can be sucked by the pipette.

In the present invention, the internal structure of the mechanical counter 21 can refer to chinese patent with publication number CN 201017342Y.

Referring to fig. 2 and 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 outside the operating button 3 and is rotatably connected with the operating button 3, the adjusting knob 61 is disposed inside the collar 1 and can move up and down along the vertical direction, the linkage member 63 is disposed between the adjusting knob 61 and the first driven gear 22, when the adjusting knob 61 moves up 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, the range of the pipette can be changed by rotating the adjusting knob 61, and the value displayed by the counter assembly 2 can be changed in response; when the adjusting knob 61 moves downwards to a certain position, the adjusting knob 61 is separated from the linkage part 63, and when the adjusting knob 61 is rotated, the range of the pipettor and the number displayed by the counter assembly 2 are not changed; the stop element 62 is arranged on the collar 1 and can stop the adjusting knob 61 in two different positions.

Referring to fig. 3 and 4, the 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 fixing 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 abutting block 42 and abuts against the abutting block 42, the fixing head 637 is sleeved on an upper end of the driving sleeve 636 and is fixedly connected with the driving sleeve 636, the fixing head 637 is shaped as a hexagonal prism vertically arranged, and an outer surface of the fixing head 637 abuts against an inner wall of the adjusting ring 631 and can move up and down inside the adjusting ring 631; the auxiliary ring 638 is sleeved outside the driving sleeve 636 and is in threaded connection with the driving sleeve 636, the positions of the auxiliary ring 638 and the collar 1 are relatively fixed, the two abutting rings 43 on the driving rod 41 are both positioned inside the auxiliary ring 638, and the lower end surface of the abutting 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 outside the auxiliary ring 638 and is rotatably connected with the auxiliary ring 638, the first driving gear 633 is disposed at a position close to the lower end face of the adjusting ring 631, and the transmission member 632 is disposed between the first driving gear 633 and the first driven gear 22, and enables the first driven gear 22 to rotate together with the first driving gear 633; the upper end of the adjusting ring 631 extends upward inside the adjusting knob 61, the adjusting ring 631 is coaxial with the adjusting knob 61, the second driving gear 635 is coaxially fixed to the inner wall of the adjusting knob 61, the second driven gear 634 is coaxially fixed to the outer wall of the adjusting ring 631, and the second driving gear 635 and the second driven gear 634 are engaged with or separated from each other when the adjusting knob 61 moves up and down.

When the range of the pipettor needs to be adjusted, the adjusting knob 61 is moved up and down in the collar 1 until the second driving gear 635 is meshed with the second driven gear 634; the adjusting knob 61 is rotated, the adjusting knob 61 can drive the adjusting ring 631 to rotate together, the fixed head 637 is hexagonal, the adjusting ring 631 can drive the fixed head 637 to rotate together, the fixed head 637 is fixedly connected with the driving sleeve 636, the fixed head 637 can drive the driving sleeve 636 to rotate together, the driving sleeve 636 is in threaded connection with the auxiliary ring 638, the auxiliary ring 638 and the ring pipe 1 are relatively fixed in position, and if the measuring range of the pipettor is adjusted, the driving sleeve 636 can drive the driving rod 41 to move downwards through the abutting block 42; if the range of the pipette is adjusted to be large, the driving sleeve 636 will move upward, and the driving rod 41 and the abutting block 42 will move upward under the action of the piston rod 52 and the second elastic member 53, so as to complete the adjustment process of the pipette range.

Referring to fig. 3 and 4, the position-limiting member 62 includes a position-limiting ring 621 and a position-limiting ring 622 having elasticity, the position-limiting ring 621 is sleeved on the outer side of the adjusting knob 61, the position-limiting ring 621 is rotatably connected with the adjusting knob 61 and the adjusting knob 61 can move up and down inside the position-limiting ring 621, the position-limiting ring 621 is disposed inside the ring pipe 1 and detachably and fixedly connected with the ring pipe 1 through a mounting ring 9, an opening is disposed on the position-limiting ring 622, a mounting groove 611 for the position-limiting ring 622 to enter is disposed on the outer surface of the adjusting knob 61, the inner diameter of the position-limiting ring 622 is smaller than the outer diameter of the adjusting knob 61, the outer diameter of the position-limiting ring 622 is larger than the outer diameter of the adjusting knob 61, two position-limiting grooves 623 for the position-limiting ring 622 to enter are disposed on the inner wall of the position-limiting ring 621, when the retainer ring 622 is located in the upper retainer groove 623, the second driving gear 635 and the second driven gear 634 are engaged with each other.

When the adjusting knob 61 is moved in the vertical direction, in order to facilitate the engagement between the second driving gear 635 and the second driven gear 634, three notches are uniformly formed in the second driving gear 635 along the circumferential direction of the second driving gear 635.

Referring to fig. 3 and 4, the 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 to the fourth gear 6322, the third gear 6321 is located above the fourth gear 6322, the third gear 6321 has a radius smaller than that of the fourth gear 6322, the fourth gear 6322 is engaged with the first driven gear 22 and has an upper surface contacting the first driving gear 633, the third gear 6321 is engaged with the first driving gear 633, the fixing plate 6324 is horizontally disposed below the fourth gear 6322 and is fixedly connected to the auxiliary ring 638, and the first elastic member 6323 is disposed between the fixing plate 6324 and the fourth gear 6322. When the range of the pipettor is adjusted, the first driving gear 633 can drive the third gear 6321 to rotate, the third gear 6321 can drive the fourth gear 6322 to rotate, and the fourth gear 6322 can drive the first driven gear 22 to rotate, so that when the range of the pipettor is changed, the displayed reading of the counter assembly 2 can be correspondingly changed; if the actual volume of liquid that can be sucked inside the pipette and the number indicated on the counter assembly 2 have errors, that is, when people need to calibrate the pipette, the fourth gear 6322 is pressed downward to separate the third gear 6321 from the first driving gear 633, so that when the range of the pipette is adjusted, the number on the mechanical counter 21 is not changed, and then the range of the pipette is gradually changed by taking the number on the mechanical counter 21 as a fixed value, so that the amount of liquid sucked by the pipette corresponds to the number on the mechanical counter 21.

Referring to fig. 3 and 4, in order to facilitate separation of the third gear 6321 from the first driving gear 633, a vertical connecting rod 7 is disposed at the center of the third gear 6321, a lower end of the connecting rod 7 extends below the fourth gear 6322, the connecting rod 7 is slidably connected to the third gear 6321 and the fourth gear 6322, a latch 71 is disposed on the connecting rod 7, a lower surface of the latch 71 abuts against an upper end surface of the third gear 6321, an upper end of the connecting rod 7 extends upward above the mechanical counter 21, a pressing plate 72 capable of moving up and down above the mechanical counter 21 is disposed on a spindle 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 disposed above the collar 1, and an auxiliary rod 74 is connected between the pressing block 73 and the pressing plate 72.

When the pipettor needs to be calibrated, the pressing block 73 is moved downwards, the pressing block 73 drives the connecting rod 7 to move downwards through the auxiliary rod 74 and the pressing plate 72, and in the process that the connecting rod 7 moves downwards, the connecting rod 7 drives the third gear 6321 and the fourth gear 6322 to move downwards through the fixture block 71, so that the third gear 6321 can be separated from the first driving gear 633.

Referring to fig. 5 and 6, the collar 1 includes a lower portion 11, a handle 12 and a clamping ring 13, which are sequentially arranged from bottom to top, the clamping ring 13 is arranged at a position close to an upper end of the handle 12, the clamping ring 13 extends in a direction away from the handle 12, and a longitudinal section of the clamping ring 13 is in an upward convex arc shape, so that when an operation button 3 on the pipette is pressed downwards, the clamping ring 13 can be clamped on a palm; the installation sheet 14 is arranged in the handle 12, the installation sheet 14 is arranged at a position close to the lower end face of the handle 12, the lower end face of the auxiliary ring 638 is provided with an installation tenon 15, the installation sheet 14 is provided with an installation hole matched with the installation tenon 15, when the pipette needs to be assembled, parts above the auxiliary ring 638 are downwards installed in the handle 12 from the upper end head of the handle 12, and the installation tenon 15 is inserted into the installation hole; the lower portion 11 further comprises a connecting portion 111 and an installation pipe 112, the cylinder body 51 inside the piston assembly 5 is arranged inside the connecting portion 111, an O-ring 16 is arranged between the lower end head of the cylinder body 51 and the side wall of the connecting portion 111, the upper end head of the connecting portion 111 is upwards inserted into the handle 12 and is in threaded connection with the handle 12, the installation pipe 112 is vertically fixed on the lower end head of the connecting portion 111, in the using process of a pipette, people can install the Tip head 8 on the installation pipe 112, and the Tip head 8 can conveniently suck liquid inside the container.

Referring back to fig. 3, in order to make the connection between the handle 12 and the connecting portion 111 inside the lower portion 11 more stable, and in order to make the auxiliary ring 638 more stably mounted on the mounting plate 14, a clamping block 64 is disposed outside the auxiliary ring 638, a compressed fifth elastic member 65 is disposed between the clamping block 64 and the upper end of the connecting portion 111, and the fifth elastic member 65 can make the end inside the mounting tenon 15 abut against the lower surface of the mounting plate 14.

Referring to fig. 2, after the Tip head 8 is used, in order to conveniently take the Tip head 8 off the mounting tube 112, a push tube 17 is sleeved outside the lower portion 11, the push tube 17 is slidably connected with the lower portion 11, the lower end surface of the push tube 17 abuts against the Tip head 8, and a push-out member 18 for driving the push tube 17 to reciprocate in the vertical direction is arranged on the handle 12.

Referring to fig. 4 and 5, the ejector 18 includes an ejector rod 181, a sixth elastic member 182, the push-out rod 181 is vertically arranged below the mechanical counter 21, the upper end of the push-out rod 181 is relatively fixed to a fixing plate 6324 on the auxiliary ring 638, the lower end of the push-out rod 181 is fixedly connected to the push pipe 17, the sixth elastic member 182 is sleeved on the push-out rod 181 and is in a stretched state, the connecting frame 183 is arranged inside the handle 12 and extends upward above the snap ring 13, one side of the connecting frame 183 close to the push-out rod 181 is fixedly connected to the upper end of the push-out rod 181, the push seat 184 is arranged above the snap ring 13 and can move up and down inside the snap ring 13, the push block 73 is arranged above the push seat 184, an accommodating groove 185 matched with the push block 73 is formed in the upper end face of the push seat 184, and the push seat 184 is fixedly connected to the upper end of the connecting frame 183.

When the Tip head 8 is separated from the mounting tube 112 by the pushing-out member 18, the handle 12 is gripped, the pressing seat 184 is moved downward, the pressing seat 184 drives the connecting frame 183 to move downward together, the connecting frame 183 is fixedly connected with the pushing-out rod 181, and the positions of the pushing-out rod 181 and the fixing plate 6324 on the auxiliary ring 638 are relatively fixed, so that the pushing-out rod 181 drives the pushing-out tube 17 to move downward, so that the pushing-out tube 17 can separate the Tip head 8 from the mounting tube 112, and in the process of downward movement of the pushing-out rod 181, the pushing-out rod 181 drives the auxiliary ring 638 to move upward and downward inside the handle 12 by the fixing plate 6324; the push pipe 17 is then restored to the original position by the fifth elastic member 65, the push rod 181, and the sixth elastic member 182.

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 suitable.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides a pipette, includes ring pipe (1) and sets up at inside actuating lever (41) of ring pipe (1), with actuating lever (41) fixed connection and make the pipette realize imbibition or operating button (3) of flowing back, can drive actuating lever (41) along self axis reciprocating motion realize range regulation's adjusting part (6) and be used for showing counter subassembly (2) of pipette range, its characterized in that: counter subassembly (2) are including mechanical counter (21), the input of mechanical counter (21) is provided with first driven gear (22), adjusting part (6) are including driving first driven gear (22) pivoted linkage piece (63) and adjust knob (61), adjust knob (61) cover is established on operating button (3) and is rotated with adjust knob (61) and be connected, adjust knob (61) set up in ring pipe (1) inside and can realize being connected and breaking away the ring pipe with linkage piece (63) along the axis direction reciprocating motion of actuating lever (41), be provided with on ring pipe (1) and carry out fixed locating part (62) to the position of adjust knob (61).

2. A pipette as defined in claim 1, wherein: linkage (63) are established including the cover and are established adjusting ring (631) on actuating lever (41), and the cover is equipped with second driven gear (634) and can drives first driven gear (22) pivoted first driving gear (633) on the global of adjusting ring (631), and adjusting ring (631) rotates and sets up inside ring pipe (1), and adjust knob (61) inside is provided with second driving gear (635) that can mesh with second driven gear (634).

3. A pipette as defined in claim 2, wherein: the driving rod (41) is sleeved with a driving sleeve (636), one end of the driving sleeve (636) close to the operating button (3) is fixedly connected with a fixing head (637), the outer surface of the fixing head (637) is provided with at least one plane, the outer surface of the fixing head (637) is abutted against the inner wall of an adjusting ring (631) and can reciprocate inside the adjusting ring (631) along the axis of the driving rod (41), the end surface of the driving sleeve (636) far away from the operating button (3) is provided with an abutting block (42) fixedly connected with the driving rod (41), an auxiliary ring (638) is coaxially and rotatably arranged inside the adjusting ring (631), the position of the auxiliary ring (638) is relatively fixed with the position of the ring pipe (1), and the auxiliary ring (638) is in threaded connection with the driving sleeve (636), one end of the driving rod (41) far away from the operation button (3) is provided with a piston assembly (5) and the driving rod (41) can move towards the direction far away from the piston assembly (5) under the action of the piston assembly (5).

4. A pipette as defined in claim 3, wherein: the piston assembly (5) comprises a cylinder body (51) and a piston rod (52) which is arranged in the cylinder body (51) and is in coaxial abutting contact with the driving rod (41), a second elastic piece (53) which drives the piston rod (52) to move towards the direction far away from the cylinder body (51) is arranged between the piston rod (52) and the cylinder body (51), two abutting rings (43) are arranged along the axis direction of the driving rod (41), the abutting rings (43) are arranged in the auxiliary rings (638), the abutting rings (43) close to the cylinder body (51) are fixedly connected with the auxiliary rings (638), the abutting rings (43) far away from the cylinder body (51) are in sliding connection with the auxiliary rings (638), and a third elastic piece (44) is arranged between the two abutting rings (43).

5. A pipette as defined in claim 1, wherein: locating part (62) including set up between adjust knob (61) and ring pipe (1) and with ring pipe (1) fixed connection's spacing ring (621), the cover is equipped with on adjust knob (61) global and has elastic spacing collar (622), be provided with the opening on spacing collar (622), spacing collar (622) are embedded into adjust knob (61) inside and the external diameter of spacing collar (622) is greater than the external diameter of adjust knob (61), set up two spacing grooves (623) that supply spacing collar (622) to get into on the inner wall of spacing ring (621) along the axis direction of actuating lever (41), when spacing collar (622) are located inside two spacing grooves (623), second driving gear (635) and second driven gear (634) meshing or separation.

6. A pipette as defined in claim 2, wherein: be provided with driving medium (632) between first driving gear (633) and first driven gear (22), driving medium (632) are including coaxial fixed connection's third gear (6321) and fourth gear (6322), fourth gear (6322) meshes with first driven gear (22) and upper surface and first driving gear (633) looks butt, third gear (6321) meshes with first driving gear (633) mutually, one side that fourth gear (6322) kept away from first driving gear (633) is provided with fixed plate (6324) with supplementary ring (638) fixed connection, be provided with first elastic component (6323) between fixed plate (6324) and fourth gear (6322).

7. A pipette as defined in claim 6, wherein: the center of the fourth gear (6322) is rotatably connected with a connecting rod (7), the connecting rod (7) is sleeved with a clamping block (71) which is abutted to the end face of the third gear (6321), and one end, far away from the fourth gear (6322), of the connecting rod (7) extends towards the direction far away from the fourth gear (6322) and is connected with a pressing block (73) on the outer side of the ring pipe (1).

8. A pipette as defined in claim 2, wherein: a plurality of notches are uniformly formed on the second driving gear (635) along the circumferential direction of the second driving gear (635).

9. A pipette as defined in claim 5, characterised in that: ring pipe (1) including mutual threaded connection's handle (12) and lower part (11), fixed connection can be dismantled with handle (12) in the position that lower part (11) was kept away from in handle (12) spacing ring (621), and auxiliary ring (638) are provided with installation tenon (15) on being close to the terminal surface of lower part (11), and the position that handle (12) inside is close to lower part (11) is provided with installation piece (14) that are used for fixed mounting tenon (15).

10. A pipette as defined in claim 1, wherein: ring pipe (1) is including handle (12) and lower part (11) of mutual threaded connection, the one end that handle (12) were kept away from in lower part (11) is provided with installation pipe (112) that are used for installing Tip head (8), the outside cover of lower part (11) is equipped with ejector sleeve (17), ejector sleeve (17) are close to the terminal surface and the Tip head (8) looks butt of Tip head (8), be provided with on handle (12) and drive lower part (11) to being close to or keep away from ejector part (18) that the direction of Tip head (8) removed.