CN212092332U

CN212092332U - Suck-back prevention pipette

Info

Publication number: CN212092332U
Application number: CN202020278684.2U
Authority: CN
Inventors: 黄丹
Original assignee: Yongchuan Hospital of Chongqing Medical University
Current assignee: Yongchuan Hospital of Chongqing Medical University
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2020-12-08
Anticipated expiration: 2030-03-09

Abstract

The utility model relates to an experimental facilities technical field especially relates to a prevent suck-back pipette, including casing, piston, push rod and rifle head, the casing top is equipped with the mounting groove, the mounting groove interpolation is equipped with the mount pad, mount pad bottom integrated into one piece has a solid fixed cylinder, push rod one end is worn to establish in solid fixed cylinder, piston fixed mounting is terminal at the push rod, and the piston is located outside the solid fixed cylinder, gu the fixed cylinder overcoat is equipped with first spring, first spring one end and mount pad fixed connection, the other end and piston fixed connection, rifle head sealing connection is at the end of casing, mount pad upper end integrated into one piece has an installation section of thick bamboo, install a plurality of stop device on the installation section of thick bamboo, it is a plurality of stop device circumference array is at the inner wall of installation section of thick bamboo. Through stop device for the propelling movement pole can't kick-back after pressing down, prevent that the experimenter maloperation from loosening the propelling movement pole, make in liquid suck-back pipette.

Description

Suck-back prevention pipette

Technical Field

The utility model relates to a refuse treatment technical field especially relates to a prevent suck-back pipette.

Background

The pipette is one kind of pipettor, is commonly used in the laboratory to the removal of a small amount of or trace liquid, and the specification is different, and the pipette of different specifications matches and uses the rifle head of different sizes, and the shape of different manufacturers' production is also slightly different, but theory of operation and operating method are unanimous basically.

Most of the prior liquid-transfering guns comprise a shell, a piston assembly, a pushing device and a gun head, wherein the pushing device pushes the piston assembly to move in the shell, so that the air pressure in the shell is changed, and a reagent is sucked or extruded.

In the experimental process, some experiments need to add reagents or solutions for treatment at intervals, and some experiments with large amount (such as sample detection) need to add reagents or solutions one by one. Because be equipped with the spring among the pusher, have the trend of resumeing deformation after the spring compression, the experimenter is in the joining back of accomplishing a reagent, if the maloperation loosens pusher, wait to detect in sample liquid will suck the pipetting gun backward, with pipetting gun internal contamination, influence subsequent other sample liquid's detection.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a prevent suck-back pipette through stop device for the propelling movement pole can't kick-back after pressing down, prevents that the experimenter maloperation from loosening the propelling movement pole, makes in the liquid suck-back pipette.

The utility model discloses an above-mentioned technical problem is solved to following technical means:

the utility model provides a prevent suck-back pipette, includes casing, piston, push rod and rifle head, the casing top is equipped with the mounting groove, the mounting groove interpolation is equipped with the mount pad, mount pad bottom integrated into one piece has a fixed cylinder, push rod one end is worn to establish in the fixed cylinder, piston fixed mounting is terminal at the push rod, and the piston is located outside the fixed cylinder, the fixed cylinder overcoat is equipped with first spring, first spring one end and mount pad fixed connection, the other end and piston fixed connection, rifle head sealing connection is at the end of casing, mount pad upper end integrated into one piece has an installation section of thick bamboo, install a plurality of stop device on the installation section of thick bamboo, it is a plurality of the inner wall of stop device circumference array at the installation section of thick bamboo.

Further, the limiting device comprises a fixing rod, a second spring and a clamp, one end of the fixing rod is fixedly connected with the mounting cylinder, the other end of the fixing rod is clamped in the clamp, the second spring is sleeved on the fixing rod, one end of the second spring is fixedly connected with the clamp, an annular groove is formed in the push rod, the clamp is clamped in the annular groove, the upper end of the clamp is a cambered surface, the lower end of the clamp is a plane, and a plurality of annular grooves are uniformly distributed in the axial direction of the push rod. Stop device makes the propelling movement pole can only move down, and unable resilience prevents the pipette from suck-back.

Further, the cover is equipped with an adjusting cylinder on the push rod, the outer wall of adjusting cylinder and the inner wall laminating of a fixed cylinder, the terminal integrated into one piece of adjusting cylinder has the bulge loop, the notch has been seted up on the bulge loop, the checkpost passes the annular groove block on notch and the push rod, the holding tank has been seted up on the mount pad, install the third spring in the holding tank, the bulge loop is terminal and third spring fixed connection, and the end of bulge loop is inserted and is established in the holding tank. The adjusting cylinder is arranged between the fixed cylinder and the pushing rod in a sliding mode, and after the adjusting cylinder is pressed, the adjusting cylinder can reset automatically under the action of the third spring.

Further, the homogeneous shaping in both sides of notch inner wall has the sloping block, the homogeneous shaping in both sides of checkpost has the draw runner, the draw runner laminating is on the sloping block, a shaping has the sand grip on the push rod, the spout has been seted up on adjusting a section of thick bamboo inner wall, the sand grip card is established in the spout. When the adjusting cylinder resets, the clip is driven to return, so that the clip is separated from the clamping with the annular groove.

Further, a limiting groove is formed in the inner wall of the accommodating groove, a limiting plate is installed in the side wall of the limiting groove in a rotating mode, the limiting plate is installed on the side wall of the limiting groove through a torsion spring, an umbrella-shaped protruding block is fixedly installed on the inner wall of the bottom end of the convex ring, and the umbrella-shaped protruding block is clamped in the limiting plate. Make and adjust a section of thick bamboo detachable and install on the fixing base, push away the limiting plate through the sand grip on the push rod for adjust a section of thick bamboo and fixing base disconnection.

Further, the top of casing is equipped with the top cap, the top of an installation section of thick bamboo protrudes the casing top, top cap lock installation section of thick bamboo top, the outer wall threaded connection of top cap bottom and casing, a regulation section of thick bamboo and push rod pass the top cap protrusion outside the casing

The utility model has the advantages that: the utility model discloses an aspect, through the annular groove on checkpost, first spring and the push rod, when the push rod is pressed down, the checkpost backspacing, continue to move and make the checkpost card go into in subsequent annular groove, the checkpost upper end is the cambered surface, the lower extreme is the plane, after the checkpost card goes into the annular groove, prevent the push rod kick-backs, and then prevent that the experimenter maloperation from loosening the push rod, make the liquid suck the condition in the liquid-transfering gun backward; on the other hand, through adjusting the slider on the section of thick bamboo goes up sloping block, third spring and the checkpost, press and adjust a section of thick bamboo, make and adjust a section of thick bamboo and move down, the checkpost pops out from the notch, with the annular groove block, loosens back third spring and makes an adjustment section of thick bamboo rise, and sloping block and the cooperation of slider make the checkpost retract, break away from with the block of annular groove.

Through the umbrella-shaped lug on the bulge loop, limiting plate on the mount pad and the sand grip on the push rod for adjust a section of thick bamboo and can fix on the mount pad, when the push rod propelling movement finishes, the sand grip pushes away the limiting plate, makes the umbrella-shaped lug break away from the block of limiting plate.

Drawings

FIG. 1 is a schematic view of a liquid-transfering gun with anti-suck back function;

FIG. 2 is a schematic view of the cross-sectional structure of a suck-back prevention pipette of the present invention;

FIG. 3 is a schematic view showing a cross-sectional structure of a partial structure in a suck-back prevention pipette of the present invention;

FIG. 4 is an enlarged schematic view of A in FIG. 3;

FIG. 5 is a schematic view showing a disassembled structure of a mounting seat and an adjusting cylinder in the suck-back prevention pipette of the present invention;

FIG. 6 is an enlarged schematic view of B of FIG. 5;

FIG. 7 is a schematic view of a push rod of the pipette with anti-suck back of the present invention;

the gun comprises a shell 1, a top cover 12, a piston 2, a first spring 21, a pushing rod 3, an annular groove 31, a convex strip 32, a gun head 4, a mounting seat 5, a fixed cylinder 51, a mounting cylinder 52, a receiving groove 53, a fixed rod 531, a second spring 532, a clamp 533, a third spring 534, a sliding strip 535, a limiting groove 54, an adjusting cylinder 6, a convex ring 61, a notch 611, an inclined block 612, an umbrella-shaped convex block 62, a sliding groove 63 and a limiting plate 7.

Detailed Description

The invention will be described in detail with reference to the following drawings and specific embodiments:

as shown in fig. 1-7, the utility model discloses a prevent suck-back pipette, including casing 1, piston 2, push rod 3 and rifle head 4, casing 1 top is equipped with the mounting groove, and the mounting groove interpolation is equipped with

mount pad

5, and 5 bottom integrated into one piece of mount pad have solid fixed cylinder 51, and 3 one ends of push rod are worn to establish in solid fixed cylinder 51, and 2 fixed mounting of piston are at push rod 3 terminal, and piston 2 is located outside solid fixed cylinder 51. The fixed cylinder 51 is sleeved with a first spring 21, one end of the first spring 21 is fixedly connected with the mounting seat 5, the other end of the first spring 21 is fixedly connected with the piston 2, and the gun head 4 is hermetically connected at the tail end of the shell 1.

An installation cylinder 52 is integrally formed at the upper end of the installation seat 5, a plurality of limiting devices are installed on the installation cylinder 52, and the limiting devices are circumferentially arrayed on the inner wall of the installation cylinder 52. The limiting device comprises a fixing rod 531, a second spring 532 and a clamp 533, one end of the fixing rod 531 is fixedly connected with the installation cylinder 52, the other end of the fixing rod 531 is clamped in the clamp 533, the second spring 532 is sleeved on the fixing rod 531, and one end of the second spring is fixedly connected with the clamp 533, so that the clamp 533 can slide on the fixing rod 531.

The push rod 3 is provided with an annular groove 31, the clamp 533 is clamped in the annular groove 31, and the annular groove 31 is uniformly distributed with a plurality of parts along the axial direction of the push rod 3. When push rod 3 is pushed down by the experimenter, push rod 3 extrudes clip 533, makes second spring 532 compress, and clip 533 withdraws from annular groove 31, continues to promote push rod 3, and when next annular groove 31 moved to clip 533 position, second spring 532 recovered deformation, made clip 533 block again and establish in annular groove 31. Checkpost 533 upper end is the cambered surface, and the lower extreme is the plane for propelling movement pole 3 can only push down, can't roll back, prevents that the experimenter from when the maloperation, and the condition of suck-back appears in the liquid-transfering gun.

The cover is equipped with an adjusting cylinder 6 on the propelling movement pole 3, the outer wall of an adjusting cylinder 6 and the inner wall laminating of a fixed cylinder 51, the terminal integrated into one piece of an adjusting cylinder 6 has bulge loop 61, notch 611 has been seted up on bulge loop 61, checkpost 533 passes the annular groove 31 block on notch 611 and the propelling movement pole 3, holding tank 53 has been seted up on mount pad 5, install third spring 534 in the holding tank 53, bulge loop 61 is terminal with third spring 534 fixed connection, and the end of bulge loop 61 is inserted and is established in holding tank 53, the equal integrated into one piece in both sides of notch 611 inner wall has sloping block 612, the equal integrated into one piece in both sides of checkpost 533 has draw runner 535, the draw runner 535 laminates on sloping block 612. When pressing down the regulation section of thick bamboo 6, make the regulation section of thick bamboo 6 move down, checkpost 533 pops out from notch 611, with annular groove 31 block, unclamp behind the regulation section of thick bamboo 6, when the regulation section of thick bamboo 6 shifts up, sloping block 612 extrudes draw runner 535, makes checkpost 533 compress second spring 532, and checkpost 533 withdraws from annular groove 31, and first spring 21 makes push rod 3 shift up.

An umbrella-shaped lug 62 is fixedly mounted on the inner wall of the bottom end of the convex ring 61, a limiting groove 54 is formed in the inner wall of the accommodating groove 53, a limiting plate 7 is rotatably mounted in the side wall of the limiting groove 54, the limiting plate 7 is arranged obliquely downwards, and the limiting plate 7 is mounted on the side wall of the limiting groove 54 through a torsion spring. The adjusting cylinder 6 moves downwards, the third spring 534 is compressed, the umbrella-shaped lug 62 at the bottom end of the convex ring 61 is clamped into the limiting plate 7, after the umbrella-shaped lug 62 is clamped into the limiting plate 7, the limiting plate 7 rebounds through the torsion spring, the umbrella-shaped lug 62 is clamped, and the adjusting cylinder 6 is fixed.

The convex strip 32 is formed on the push rod 3, when the push rod 3 presses the lowest end, the convex strip 32 is clamped into the limiting groove 54, the limiting plate 7 is pushed, the limiting plate 7 moves towards two sides, the umbrella-shaped convex block 62 is separated from the limiting position of the limiting plate 7, and the adjusting cylinder 6 moves upwards through the second spring 532.

The inner wall of the adjusting cylinder 6 is provided with a sliding groove 63, and the convex strip 32 is clamped in the sliding groove 63 to prevent the push rod 3 from rotating relative to the adjusting cylinder 6.

The top of casing 1 is equipped with top cap 12, and the top of an installation section of thick bamboo 52 protrudes casing 1 top, and top cap 12 lock installation section of thick bamboo 52 top, top cap 12 bottom and casing 1's outer wall threaded connection, and a regulation section of thick bamboo 6 and push rod 3 pass the top cap, and the protrusion is outside casing 1.

The utility model discloses a when preventing suck-back pipette use, press push rod 3 earlier, extrude the gas in the pipette, put into the reagent of waiting to draw with rifle head 4, loosen push rod 3, under the effect of first spring 21 again, push rod 3 rises, draws the pipette with the reagent in, then will adjust a section of thick bamboo 6 and press down, make the 62 blocks of umbrella-shaped lug at the 7 lower extremes of limiting plate, checkpost 533 pops out from notch 611, with the 31 blocks of annular groove. When extruding liquid, the pushing rod 3 can only be pushed downwards under the limit of the clamp 533, and cannot be retracted, so that the situation that the pipetting gun sucks backwards when an experimenter operates by mistake is prevented.

After liquid in the liquid transferring gun is squeezed, the pushing rod 3 is pressed downwards to the lowest end, the convex strip 32 pushes the limiting plate 7 away, the umbrella-shaped convex block 62 is separated from the clamping of the limiting plate 7, the adjusting cylinder 6 is separated from the clamping to be dead, the clamp 533 is retracted, the pushing rod 3 can move freely at the moment, liquid is sucked again, the adjusting cylinder 6 is pressed downwards after the liquid is sucked, the clamp 533 is popped out, and one-way limiting is carried out on the pushing rod 3.

The utility model discloses for prior art, through stop device for the propelling movement pole can't kick-back after pressing down, prevents that the experimenter maloperation from loosening the propelling movement pole, makes in liquid suck-back pipette.

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will understand that the present invention can be modified or replaced with other embodiments without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims. The technology, shape and construction parts which are not described in detail in the present invention are all known technology.

Claims

1. The utility model provides a prevent suck-back pipette which characterized in that: the automatic feeding device comprises a shell (1), a piston (2), a push rod (3) and a gun head (4), wherein a mounting groove is formed in the top of the shell (1), a mounting seat (5) is inserted in the mounting groove, a fixed cylinder (51) is integrally formed at the bottom end of the mounting seat (5), one end of the push rod (3) is arranged in the fixed cylinder (51) in a penetrating manner, the piston (2) is fixedly arranged at the tail end of the push rod (3), the piston (2) is positioned outside the fixed cylinder (51), a first spring (21) is sleeved outside the fixed cylinder (51), one end of the first spring (21) is fixedly connected with the mounting seat (5), the other end of the first spring is fixedly connected with the piston (2), the gun head (4) is connected to the tail end of the shell (1) in a sealing manner, a mounting cylinder (52) is integrally formed at the upper end of the mounting seat (5), and a plurality of, and a plurality of limiting devices are circumferentially arrayed on the inner wall of the mounting cylinder (52).

2. The suck-back prevention pipette as defined in claim 1, characterized in that: stop device includes dead lever (531), second spring (532) and checkpost (533), the one end and the installation section of thick bamboo (52) fixed connection of dead lever (531), the other end card is established in checkpost (533), second spring (532) cover is established on dead lever (531), and one end and checkpost (533) fixed connection, be equipped with annular groove (31) on push rod (3), checkpost (533) card is established in annular groove (31), checkpost (533) upper end is the cambered surface, and the lower extreme is the plane, annular groove (31) have a plurality of along push rod (3) axial evenly distributed.

3. An anti-suck back pipette as defined in claim 2, further comprising: the cover is equipped with an adjusting cylinder (6) on push rod (3), the outer wall of adjusting cylinder (6) is laminated with the inner wall of a fixed cylinder (51), the terminal integrated into one piece of adjusting cylinder (6) has bulge loop (61), notch (611) have been seted up on bulge loop (61), checkpost (533) pass annular groove (31) block on notch (611) and push rod (3), holding tank (53) have been seted up on mount pad (5), install third spring (534) in holding tank (53), bulge loop (61) end and third spring (534) fixed connection, and the end of bulge loop (61) is inserted and is established in holding tank (53).

4. A suck-back prevention pipette as defined in claim 3, further comprising: the equal integrated into one piece in both sides of notch (611) inner wall has sloping block (612), the equal integrated into one piece in both sides of checkpost (533) has draw runner (535), draw runner (535) laminating is on sloping block (612), the last shaping of push rod (3) has sand grip (32), spout (63) have been seted up on adjusting a section of thick bamboo (6) inner wall, sand grip (32) card is established in spout (63).

5. An anti-suck back pipette as defined in claim 4, further comprising: spacing groove (54) have been seted up on the inner wall of holding tank (53), limiting plate (7) are installed to the lateral wall internal rotation of spacing groove (54), limiting plate (7) are installed on the lateral wall of spacing groove (54) through the torsional spring, fixed mounting has umbrella-shaped lug (62) on the inner wall of bulge loop (61) bottom, umbrella-shaped lug (62) card is established in limiting plate (7).

6. An anti-suck back pipette as defined in claim 5, in which: the top of casing (1) is equipped with top cap (12), the top of installation section of thick bamboo (52) protrudes casing (1) top, a top cap (12) lock installation section of thick bamboo (52) top, the outer wall threaded connection of top cap (12) bottom and casing (1), it passes top cap (12) protrusion outside casing (1) to adjust a section of thick bamboo (6) and push rod (3).