CN210206908U - Liquid-transfering gun - Google Patents

Abstract

The utility model discloses a liquid-transfering gun, its sealing performance is better. A liquid-transfering gun comprises a piston assembly capable of moving in the up-down direction and a piston sleeve gun head assembly, wherein the piston assembly is movably arranged in a shell in the up-down direction, and comprises a sliding plate capable of being connected to the shell in a sliding manner in the up-down direction and one or more pistons which are arranged on the sliding plate and extend in the up-down direction; the piston sleeve gun head assembly is arranged at the lower end part of the shell and comprises one or more pipetting units, each pipetting unit comprises a piston sleeve positioned in the shell, the piston sleeve is hollow so that the piston can be inserted and can move up and down, and a sealing ring is arranged between the upper end part of the piston sleeve and the piston.

Description

Liquid-transfering gun

Technical Field

The utility model relates to a medical treatment detection and analysis equipment field, in particular to liquid-transfering gun.

Background

The pipette is a test tool commonly used in biological tests and is commonly used for taking and transferring small or trace liquid. At present, in a commonly used pipette, the air pressure in an inner cavity of a suction head connected to a pipette head is changed by up-and-down reciprocating movement of a piston, so that the purpose of sucking a reagent into the suction head and discharging the reagent from the suction head is achieved. Therefore, the sealing performance of the pipette is required to be higher.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a liquid-transfering gun, its sealing performance is better.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a liquid-transfering gun comprises a piston assembly capable of moving in the up-down direction and a piston sleeve gun head assembly, wherein the piston assembly is movably arranged in a shell in the up-down direction, and comprises a sliding plate capable of being connected to the shell in a sliding manner in the up-down direction and one or more pistons which are arranged on the sliding plate and extend in the up-down direction; the piston sleeve gun head assembly is arranged at the lower end part of the shell and comprises one or more pipetting units, each pipetting unit comprises a piston sleeve positioned in the shell, the piston sleeve is hollow so that the piston can be inserted and can move up and down, and a sealing ring is arranged between the upper end part of the piston sleeve and the piston.

Preferably, the upper end of piston bush has seted up the step hole, inlay on the step hole and be equipped with oil free bush, the piston certainly pass and get into in the oil free bush in the piston bush, the sealing washer inlays to be located the step face of piston bush reaches between the lower terminal surface of oil free bush, and with the side surface sealing contact of piston.

More preferably, the seal ring is a star seal ring.

Preferably, a containing groove matched with the piston sleeve is formed in the sliding plate, the piston is arranged in the containing groove, after the piston assembly slides downwards, the piston sleeve is inserted into the containing groove, and the piston is inserted into the piston sleeve.

More preferably, the upper end of the piston is fixedly connected to the housing through a piston fixing post, and the piston fixing post is clamped at the upper end of the accommodating groove.

More preferably, the piston fixing post is made of plastic and is in sealing contact with the vessel.

Preferably, the piston is a ceramic plunger.

Preferably, the piston sleeve gun head assembly comprises a plurality of pipetting units, and tips of the pipetting units are linearly arranged.

The utility model adopts the above scheme, compare prior art and have following advantage:

a sealing ring is arranged between the piston and the upper end part of the piston sleeve, so that the piston sleeve has better sealing performance, the air tightness of the piston sleeve is ensured, and the liquid suction and discharge of a suction head loaded on the gun head are facilitated.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a front view of a pipette of an embodiment;

FIG. 2a is an exploded view of the pipette of FIG. 1;

FIG. 2b is a cross-sectional view of the pipette of FIG. 1;

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

FIG. 4 is a perspective view of the photo sensor and drive assembly;

FIG. 5 is a cross-sectional view of the photosensor and drive assembly of FIG. 4;

FIG. 6 is a schematic view of the housing;

FIG. 7 is a schematic view of a portion of the housing;

FIG. 8 is a perspective view of the piston assembly;

FIG. 9 is a cross-sectional view of the piston assembly shown in FIG. 8;

fig. 10 is an exploded schematic view of one of the pipetting units of the tip assembly;

FIG. 11 is a cross-sectional view of the pipetting unit of FIG. 10 after assembly;

FIG. 12 is a schematic view of the pipette after concealing a portion of the housing and a portion of the piston sleeve;

fig. 13 is a schematic view of the pipette gun of fig. 12 after further concealing the housing.

Wherein:

1. a drive assembly; 11. a motor; 12. a lead screw; 13. a first magnet;

2. a piston assembly; 21. a slide plate; 210. a linear bearing; 211. a containing groove; 22. a piston; 23. a push handle; 24. a second magnet; 25. a piston fixing column; 26. a guide bush;

3. a gun head assembly; 31. a piston sleeve; 32. a gun head seat; 33. a gun head; 331. a first flange; 332. a second flange; 34. an oilless bushing; 35. a seal ring; 36. an O-shaped sealing ring; 37. a buffer spring;

4. a housing; 41. a gun head pressing plate; 42. a guide shaft; 43. blind holes;

5. a photosensor;

6. a suction head removing component; 61. pushing the cover; 62. a guide ejector rod; 63. a return spring; 64. a return post;

7. a suction head.

Detailed Description

The following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, enables the advantages and features of the invention to be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Furthermore, the technical features mentioned in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The embodiment provides a pipette, and its cooperation arm is used for automatic pipetting the application of sample. Referring to fig. 1-2, the pipette gun includes: the driving assembly 1, the piston assembly 2 and the gun head assembly 3 are sequentially arranged from top to bottom; wherein, the piston assembly 2 is movably arranged in a substantially closed shell 4 along the up-down direction, the driving assembly 1 is arranged at the upper end part of the shell 4 and is used for driving the piston assembly 2 to move along the up-down direction, and the gun head assembly 3 is arranged at the lower end part of the shell 4.

Referring to fig. 4 to 5, the driving assembly 1 includes a motor 11 and a lead screw 12 driven by the motor 11 to move up and down. In this embodiment, the motor 11 is specifically a stepping motor, and the screw 12 is connected to an output shaft of the motor 11 through a transmission component such as a coupling, so as to convert the rotational motion output by the output shaft of the motor 11 into linear motion. The lower end of the threaded spindle 12 penetrates into the housing 4 and is connected to the piston assembly 2. In this embodiment, the lower end of the lead screw 12 is preferably connected to the piston assembly 2 by magnetic force. The magnetic connection is soft connection, is different from rod-shaped hard connection, and can avoid the problem of connection precision caused by the problem of processing precision.

The pipette further comprises a photoelectric sensor 5 for controlling the actuation of the drive assembly 1. The photoelectric sensor 5 is specifically used for controlling the action of the motor 11, the photoelectric sensor 5 is electrically connected with a controller to send a detection signal to the controller, the controller is electrically connected with the motor 11 to generate an operation control signal for controlling the operation of the motor 11 according to the detection signal sent by the photoelectric sensor 5 and send the operation control signal to the motor 11, and the photoelectric sensor, the motor and the controller can be electrically connected through cables. Specifically, the photoelectric sensor 5 is configured to send a first detection signal when the gun head assembly 3 moves above a sampling region (e.g., a reagent bottle storing a reagent), and send the first detection signal to the controller, the controller generates a first control signal according to the received first detection signal and sends the first control signal to the motor 11 of the driving assembly 1, and in response to the first control signal, the motor 11 rotates to move the lead screw 12 upward, so as to drive the piston assembly 2 upward, so that the reagent is sucked into the suction head 7, and liquid filling is achieved; the photoelectric sensor 5 is further configured to send a second detection signal when the gun head assembly 3 is located above a liquid discharge area (for example, a container to be added with a reagent), and send the second detection signal to the controller, the controller generates a second control signal according to the received second detection signal and sends the second control signal to the motor 11 of the driving assembly 1, and in response to the second control signal, the motor 11 rotates in the reverse direction to move the screw rod 12 downward, so that the piston assembly 2 is driven to move downward, the reagent in the suction head 7 is discharged, and liquid discharge is achieved.

In this embodiment, the photoelectric sensor 5 is specifically a zero photoelectric sensor, and is disposed on the driving assembly 1.

Referring to fig. 6 and 7, the housing 4 has an inner cavity therein, the piston assembly 2 is movably disposed in the housing 4 along the vertical direction, and a through hole for the lead screw 12 of the driving assembly 1 to pass through is opened at the upper end of the housing 4. A gun head pressing plate 41 is fixedly embedded on the lower end part of the shell 4, and a plurality of through holes matched with the gun head assembly 3 are correspondingly formed in the lower end part of the shell 4 and the gun head pressing plate 41 and used for installing the gun head assembly 3.

Referring to fig. 8 and 9, the piston assembly 2 includes a slide plate 21 connected to the housing 4 slidably in the up-down direction, and a plurality of pistons 22 attached to the slide plate 21 and extending in the up-down direction. As shown in fig. 5 and 9, the sliding plate 21 has a push handle 23 extending upward on the top, and the push handle 23 is magnetically connected with the lower end of the screw rod 12; wherein, the lower end of the screw 12 is fixedly provided with a first magnet 13, the push handle 23 is embedded with a second magnet 24, and the first magnet 13 and the second magnet 24 attract each other to realize the connection of the screw 12 and the sliding plate 21. In this embodiment, the first magnet 13 is disposed in a hollow manner, and the first magnet 13 is sleeved outside the second magnet 24. As shown in fig. 6 and 8, guide shafts 42 extending in the vertical direction are fixedly provided on the left and right sides of the housing 4, respectively, and the left and right sides of the slide plate 21 are slidably fitted over the guide shafts 42. Preferably, linear bearings 210 are fixedly disposed on the left and right sides of the slide plate 21, and the linear bearings 210 are slidably sleeved on the guide shaft 42. The linear bearing 210 is fixedly arranged on the sliding plate 21 through a clamp spring.

As shown in fig. 9, the slide plate 21 has a plurality of accommodating grooves 211 formed therein in the vertical direction, and each accommodating groove 211 corresponds to one piston 22. Specifically, in the present embodiment, the number of the pistons 22 is eight and the pistons are equally spaced in the slide plate 21 in the left-right direction, and the number of the accommodating grooves 211 is eight accordingly. Each of the receiving grooves 211 has a piston 22 disposed therein, and the piston 22 is preferably inserted into a central portion of the receiving groove 211. The upper end of each piston 22 is fixed to the slide plate 21 by a piston fixing post 25, the piston fixing post 25 is fixedly engaged with the upper end of the corresponding receiving groove 211, and the upper end of the piston 22 is fixedly inserted into the piston fixing post 25. Guide bushes 26 are also fixedly provided at the lower end portions of the respective pockets 211. In this embodiment, the piston 22 is specifically a ceramic plunger; the piston fixing column 25 is made of plastic and is in sealing contact with the containing groove, on one hand, the piston fixing column 25 fixes the piston 22 to increase stability, and on the other hand, the piston fixing column 25 seals the upper end of the piston 22 and the upper end of the containing groove 211 to ensure good air tightness.

As shown in fig. 1 and 2a, the tip assembly 3 comprises a plurality of pipetting units, one for each piston 22. In this embodiment, the number of the pistons 22 is eight, and the number of the pipetting units is also eight, and the pipetting units are linearly arranged at equal intervals in the left-right direction. Referring to fig. 10 and 11, each pipetting unit comprises a piston sleeve 31 located in the housing 4, a gun head seat 32 arranged at the lower end of the housing 4, and a gun head 33 located outside the housing 4 and used for loading the pipette tip 7, the piston 22 is slidably inserted into the corresponding piston sleeve 31 in the up-down direction, the piston sleeve 31 and the gun head 33 are respectively arranged on the gun head seat 32, the gun head 33 and the piston sleeve 31 are hollow and are mutually communicated to form a cavity for the piston 22 to be inserted and move up and down, and the gun head 33 is provided with a through hole for communicating the cavity with the inner cavity of the pipette tip 7. Specifically, the piston sleeve 31 is inserted into the corresponding receiving groove 211 of the slide plate 21, and the slide plate 21 can slide up and down relative to the piston sleeve 31. The gun head seat 32 is arranged at the lower end part of the shell 4 through a gun head pressing plate 41, the upper end part of the gun head seat 32 is inserted into a corresponding through hole on the gun head pressing plate 41, and the other part of the gun head seat 32 is positioned below the gun head pressing plate 41; the lower end part of the piston sleeve 31 is sleeved on the upper end part of the gun head seat 32, sequentially penetrates through the gun head pressing plate 41 and the lower end part of the shell 4 to enter the shell 4 until being inserted into the accommodating groove 211 of the sliding plate 21, the gun head 33 is inserted into the lower end part of the gun head seat 32, and the gun head seat 32 is hollow, so that the piston sleeve 31 and the gun head 33 are communicated with each other to form the cavity. After the suction head 7 is loaded on the gun head 33, the pressure in the cavity is reduced along with the upward movement of the piston 22, so that negative pressure is generated, and the through hole on the gun head 33 is communicated with the cavity of the suction head 7, so that the cavity of the suction head 7 is in a negative pressure environment, and a reagent can be sucked; and as the piston 22 moves downwards, the pressure in the cavity increases, so that the reagent in the inner cavity of the suction head 7 can be discharged.

In this embodiment, the piston sleeve 31 passes through the guide bush 26 at the lower end of the receiving groove 211 and enters the receiving groove 211. A sealing ring 35 is provided between the piston 22 and the upper end of the piston sleeve 31 to ensure the airtightness of the chamber. Specifically, as shown in fig. 11, a stepped hole is formed at an upper end portion of the piston sleeve 31, an oilless bush 34 is fitted in the stepped hole, the piston 22 passes through the oilless bush 34 and enters the piston sleeve 31, the seal ring 35 is specifically fitted between a stepped surface of the piston sleeve 31 and a lower end surface of the oilless bush 34 and is in sealing contact with a side surface of the piston 22, and the seal ring 35 is preferably a star-shaped seal ring. An O-shaped sealing ring 36 is arranged between the gun head 33 and the gun head seat 32, so that the air tightness is further ensured.

As shown in fig. 10 and 11 in combination, the lance tip 33 includes a body in the form of a hollow cylinder, a first flange 331 and a second flange 332 extending outwardly from an outer circumferential surface of the body, the first flange 331 having a larger outer diameter than the second flange 332, the first flange 331 being located above the second flange 332 with a space between the first flange 331 and the second flange 332. The outer edge of the cross section in the vertical direction of the first flange 331 is curved, and the outer edge of the cross section in the vertical direction of the second flange 332 is curved. When loading the suction head 7, the lance tip 33 is inserted into the suction head 7 from top to bottom, and the suction head 7 is caught on the first flange 331 and the second flange 332. That is, the gun head 33 is substantially gourd-shaped, the lower arc is slightly smaller, and the upper arc is slightly larger, so that the suction head 7 is clamped on the gun more tightly by matching with the shape of the suction head 7, and the suction head 7 is prevented from sliding and falling off.

Further, a buffer spring 37 is provided between each of the barrel bases 32 and the housing 4. Referring to fig. 7 and 12, the gun head pressing plate 41 is provided with a plurality of through holes for the buffer springs 37 to pass through, the lower end portion of the housing 4 is provided with a plurality of blind holes 43 matching with the buffer springs 37, each blind hole 43 of the housing 4 is aligned with one through hole of the gun head pressing plate 41, and the buffer springs 37 are located in the corresponding blind holes 43 and through holes and are supported between the gun head base 32 and the lower end portion of the housing 4. The buffer spring 37 is used for buffering and protecting the gun head 33 from a transient collision when the suction head 7 is loaded and the like, and precision loss caused by damage to other parts of the cavity is avoided.

Referring to fig. 12 and 13, the pipette tip removing assembly 6 further includes a push cover 61 slidably connected to the lower end of the housing 4 in the up-down direction, and the pipette tip holder 31 is clamped between the pipette tip pressure plate 41 and the push cover 61 and cannot be separated from the pipette tip pressure plate 41. The push cover 61 has a plurality of guide pins 62, six in this embodiment, extending upward. The gun head pressing plate 41 is positioned between the push cover 61 and the shell 4, through holes for the guide ejector rods 62 to pass through are respectively arranged on the gun head pressing plate 41 and the lower end part of the shell 4, the guide ejector rods 62 pass through the gun head pressing plate 41 and the lower end part of the shell 4 to enter the shell 4, and the guide ejector rods 62 are positioned under the sliding plate 21. The push cover 61 is provided with a plurality of gun head holes for the gun heads 33 to pass through, the gun heads 33 pass through the corresponding gun head holes and then are connected to the gun head seat 32, and the aperture of the gun head holes is smaller than the outer diameter of the suction head 7; in this embodiment, the lance head hole and the lance head 33 are tightly fitted. When the piston assembly 2 slides downwards for a certain distance, the lower surface of the sliding plate 21 contacts the guide mandril 62, the sliding plate 21 abuts against the guide mandril 62 to push the guide mandril 62 to move downwards, and the push cover 61 moves downwards relative to the gun head 33, so that the sucker 7 on the gun head 33 is faded away.

The suction head removing assembly 6 further comprises a return spring 63 for returning the push cover 61, wherein the return spring 63 is specifically arranged between the push cover 61 and the shell 4 or the gun head pressing plate 41 and is used for moving the push cover 61 upwards for returning after the suction head 7 is removed. The return spring 63 is sleeved on the return column 64, the lower end of the return column 64 is connected to the push cover 61, holes for the return column 64 to pass through are correspondingly formed in the lower end portions of the gun head pressure plate 41 and the shell 4, the hole in the gun head pressure plate 41 is a step hole, the hole diameter of the upper portion of the gun head pressure plate is larger than that of the lower portion of the gun head pressure plate, a step surface is formed, a protrusion is formed in the upper portion of the return column 64, and the return spring 63 is specifically arranged between the protrusion of the return column 64 and the step surface of the gun head. In this embodiment, the number of the return springs 63 and the return posts 64 is four.

The pipette has at least the following three working states: liquid feeding state, liquid discharging state and suction head removing state. When the liquid-transfering gun is in a liquid-adding state, the photoelectric sensor 5 is triggered to send out a first detection signal and send the first detection signal to the controller, the controller generates a first operation control signal according to the received first detection signal and sends the first operation control signal to the motor 11, the motor 11 operates in the forward direction in response to the first operation control signal, the screw 12 is driven to move upwards, the piston 22 moves upwards along with the screw, and a reagent to be moved is sucked into the suction head 7; when the pipette is in a liquid discharge state, the photoelectric sensor 5 is triggered to send a second detection signal to the controller, the controller generates a second operation control signal according to the received second detection signal and sends the second operation control signal to the motor 11, the motor 11 reversely operates in response to the second control signal to drive the screw 12 to move downwards, the piston assembly 2 moves downwards to the first position, and in the process, the piston 22 moves downwards in the cavity to discharge the reagent in the suction head 7; when the pipette is in a pipette head removing state, the photoelectric sensor 5 is triggered to send a third detection signal to the controller, the controller generates a third control signal according to the received third detection signal and sends the third control signal to the motor 11, the motor 11 continues to run in a reverse direction in response to the third control signal, the screw rod 12 is driven to continue to move downwards, the piston assembly 2 continues to move downwards to a second position, the height of the second position is smaller than that of the first position, the sliding plate 21 is in contact with the guide ejector rod 62, the sliding plate 21 pushes the push cover 61 to move downwards against the guide ejector rod 62, and the pipette head 7 is removed from the pipette head 33.

The liquid transfer gun is used in an automatic liquid transfer system, and the automatic liquid transfer system further comprises a mechanical arm. The specific working process is as follows: the liquid-transfering gun moves to a working site, the mechanical arm controls the whole liquid-transfering gun to move downwards, so that 8 gun heads 33 synchronously enter a storage area of a suction head 7 below until the gun heads 33 are all inserted into the suction head 7, the suction head 7 is loaded on the gun heads 33, and the liquid-transfering gun resets; the liquid-transferring gun moves above the sample-adding area, the photoelectric sensor 5 is triggered to send out a first detection signal, so that the motor 11 is controlled to operate to drive the piston 22 to move upwards, and a reagent to be transferred is sucked into the suction head 7; the liquid transferring gun moves above the liquid discharging area, the photoelectric sensor 5 is triggered to send out a second detection signal, so that the motor 11 is controlled to run reversely to drive the piston assembly 2 to move downwards to a first position, in the process, the piston 22 moves downwards in the cavity to discharge the reagent sucked in the suction head 7, and the reagent transfer is completed; the mechanical arm enables the pipette to move to a waste area, the photoelectric sensor 5 is triggered to send a third control signal, so that the motor 11 is controlled to continuously run reversely to drive the piston assembly 2 to move downwards to a second position, the height of the second position is lower than that of the first position, in the process, the sliding plate 21 is connected with the guide ejector rod 62 and pushes the guide ejector rod 62 to move downwards, the push cover 61 moves downwards along with the sliding plate to remove the suction head 7 from the gun head 33, and the gun head 33 is prepared to load a new suction head 7 next time.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are preferred embodiments, which are intended to enable persons skilled in the art to understand the contents of the present invention and to implement the present invention, and thus, the protection scope of the present invention cannot be limited thereby. All equivalent changes or modifications made according to the principles of the present invention are intended to be covered by the scope of the present invention.

Claims (8)

1. The utility model provides a liquid-transfering gun, includes piston assembly and piston sleeve rifle head assembly that can follow the upper and lower direction and remove, its characterized in that: the piston assembly is movably arranged in the shell along the up-down direction, and comprises a sliding plate which can be connected to the shell in a sliding way along the up-down direction and one or more pistons which are arranged on the sliding plate and extend along the up-down direction; the piston sleeve gun head assembly is arranged at the lower end part of the shell and comprises one or more pipetting units, each pipetting unit comprises a piston sleeve positioned in the shell, the piston sleeve is hollow so that the piston can be inserted and can move up and down, and a sealing ring is arranged between the upper end part of the piston sleeve and the piston.

2. The pipette gun of claim 1 wherein: the upper end of piston sleeve has seted up the step hole, inlay on the step hole and be equipped with oil-free bush, the piston certainly pass and get into in the oil-free bush in the piston sleeve, the sealing washer inlays to be located the step face of piston sleeve reaches between oil-free bush's the lower terminal surface, and with the side surface sealing contact of piston.

3. The pipette gun of claim 2 wherein: the sealing ring is a star-shaped sealing ring.

4. The pipette gun of claim 1 wherein: the sliding plate is provided with a containing groove matched with the piston sleeve, the containing groove is internally provided with one piston, when the piston assembly slides downwards, the piston sleeve is inserted into the containing groove, and the piston is inserted into the piston sleeve.

5. The pipette gun of claim 4 wherein: the upper end of the piston is fixedly connected with the shell through a piston fixing column, and the piston fixing column is clamped at the upper end of the containing groove.

6. The pipette gun of claim 5, wherein: the piston fixing column is made of plastic and is in sealing contact with the containing groove.

7. The pipette gun of claim 1 wherein: the piston is a ceramic plunger.

8. The pipette gun of claim 1 wherein: the piston sleeve gun head assembly comprises a plurality of pipetting units, and the gun heads of the pipetting units are linearly arranged.

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