CN217747139U - Gun head connecting mechanism and liquid transfer device - Google Patents

Abstract

The application relates to rifle head coupling mechanism and liquid-transfering device, rifle head coupling mechanism includes: a main housing having a receiving cavity; a transfer member having a transfer chamber; one end of the gun head sleeve is hermetically inserted in the transfer cavity, the other end of the gun head sleeve extends out of the accommodating cavity to butt the pipette head, and the gun head sleeve is provided with a transfer channel for communicating the transfer cavity and the pipette head; the joint spare is installed outside the main casing body and stretches out the one end that holds the chamber around the movable sleeve, and the joint spare includes a plurality of jack catchs, and all jack catchs are arranged along circumference interval, with the telescopic outer wall of rifle head defines jointly and forms the joint chamber that is used for joint liquid-transfering gun head. Above-mentioned rifle head coupling mechanism switches between contraction state and opening state through control joint spare, can realize the automation of liquid-transfering gun head and connect and take off, has effectively avoided the size deviation that leads to because of the manufacturing error of rifle head to the influence of connection stability to effectively prevent to break down among the liquid transfer process, showing and improving liquid-transfering efficiency.

Description

Gun head connecting mechanism and liquid transfer device

Technical Field

The application relates to the technical field of biology, in particular to a gun head connecting mechanism and a liquid transfer device.

Background

The liquid transfer mechanism is a metering tool which adopts the air displacement principle to transfer liquid from an original container to another container within a certain range, is widely applied to the technical fields of medicine and health, environmental detection, food safety, fine chemistry industry and the like, and is a common tool for quantitative analysis in various scientific research institutes and laboratories.

The existing pipetting mechanism is clamped with the joint of the gun head through the butt joint part to ensure the space tightness between the inside of the pipetting mechanism and the inner cavity of the gun head, and then the pipetting mechanism is transferred to a sample or reagent tube to drive the suction or injection of related samples or reagents, so that the automatic transfer of the samples or reagents is realized.

However, since the tip of the pipetting gun is usually an injection-molded plastic part, a certain manufacturing deviation exists at the joint of the tip and the butt joint part of the pipetting mechanism, so that when the pipetting mechanism picks up the tip, on one hand, the butt joint part is connected and matched with the tip too tightly, which causes great abrasion to the butt joint part and even damages to the joint part of the tip; on the other hand, the butt joint part is too loose to be connected with the gun head, so that the gun head can not be picked up smoothly by the butt joint part, or the gun head drops in the transferring and liquid absorbing process after the gun head is picked up by the butt joint part. These practical disadvantages can cause the pipetting mechanism to fail during the automatic transfer of the sample or reagent, resulting in high failure rate of the pipetting mechanism in use, increased maintenance cost and lower pipetting efficiency.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a tip connection mechanism and a liquid transfer device which can achieve the technical effects of reducing the failure rate of the liquid transfer mechanism and improving the liquid transfer efficiency, in order to solve the problems of high failure rate of the liquid transfer mechanism and low liquid transfer efficiency.

According to an aspect of the present application, there is provided a tip connection mechanism for connecting pipette tips, comprising:

a main housing having a receiving chamber;

the transfer piece is provided with a transfer cavity and is arranged in the accommodating cavity;

one end of the gun head sleeve is hermetically inserted in the transfer cavity, the other end of the gun head sleeve extends out of the accommodating cavity to be in butt joint with the liquid-transfer gun head, and the gun head sleeve is provided with a transfer channel for communicating the transfer cavity with the liquid-transfer gun head; and

the clamping piece is arranged on the main shell and extends out of one end of the accommodating cavity around the pipette head sleeve, the clamping piece comprises a plurality of clamping jaws, and all the clamping jaws are circumferentially arranged at intervals to define a clamping cavity for clamping the pipette head together with the outer wall of the pipette head sleeve;

the clamping piece can be controlled to switch between a contraction state and an expansion state; when the clamping piece is in the contraction state, all the clamping jaws are mutually gathered to clamp the pipette tips; when the clamping piece is in the open state, all the clamping claws are far away from each other to be separated from the pipette tip.

In one embodiment, the gun head connecting mechanism further comprises a movable sleeve sleeved outside the gun head sleeve, one end of the movable sleeve is located in the accommodating cavity, and the other end of the movable sleeve is inserted into the clamping cavity;

the movable sleeve can be controlled to reciprocate relative to the clamping piece along the axial direction of the gun head sleeve, so that the clamping piece can be switched between the contraction state and the expansion state.

In one embodiment, the lance head connecting mechanism further comprises a driving assembly, and the driving assembly is accommodated in the accommodating cavity and used for driving the movable sleeve to move relative to the clamping piece towards a direction away from the transfer piece, so that the clamping piece is switched from the contraction state to the expansion state.

In one embodiment, the drive assembly comprises:

a drive member;

the movable piece is in transmission connection with the driving piece and can reciprocate along the axial direction of the gun head sleeve under the driving of the driving piece; and

one end of the guide shaft is matched and connected with the movable sleeve, and the other end of the guide shaft penetrates through and extends out of the transfer piece;

the guide shaft can drive the movable sleeve to move towards the direction away from the transfer piece under the propping of the movable piece.

In one embodiment, the driving assembly further includes a piston rod, one end of the piston rod is fixedly connected to the movable member, the other end of the piston rod is inserted into the transfer cavity in a sealing manner, and the piston rod can reciprocate along the axial direction of the gun head sleeve along with the movable member, so that positive pressure or negative pressure is generated in the transfer cavity.

In one embodiment, the gun head connecting mechanism further comprises a resetting piece, the resetting piece abuts against between the clamping piece and the movable sleeve, and when the resetting piece is in a compressed state, an acting force for enabling the movable sleeve to move towards the transfer piece can be applied to the movable sleeve, so that the clamping jaws are switched from the expanded state to the contracted state.

In one embodiment, a bulge part is convexly arranged on the cavity wall of the clamping cavity;

when the movable sleeve is far away from the bulge part, the clamping piece is in the contraction state;

when the movable sleeve is abutted against the bulge part, the clamping piece is in the opening state.

In one embodiment, a clamping portion extending into the clamping cavity is convexly arranged at one end, far away from the transfer cavity, of the clamping jaw, and the clamping portion is used for clamping the pipette head.

In one embodiment, the lance head connecting mechanism further comprises a lance head sealing element, the lance head sealing element is sleeved at one end, far away from the transfer element, of the lance head sleeve, and the lance head sealing element can elastically deform under the action of external force;

when the pipette tip is clamped in the clamping piece, the tip sealing piece is in a compressed state under the support of the pipette tip.

According to one aspect of the application, a liquid transfer device is provided, and the liquid transfer device comprises the gun head connecting mechanism, and further comprises a driving device, wherein the driving device is in transmission connection with the gun head connecting mechanism and is used for driving the gun head connecting mechanism to move.

Above-mentioned rifle head coupling mechanism switches between the shrink state and the state of opening through control joint spare, can realize the automation of liquid-transfering gun head and connect and take off, and the interconnect between them is realized through the direct joint of liquid-transfering mechanism and liquid-transfering gun head in prior art relatively, and the connected mode of this application has effectively avoided the size deviation because of the manufacturing error of liquid-transfering gun head leads to the influence of connection stability to effectively prevent to break down among the liquid transfer process, showing and improving liquid-transfering efficiency.

Drawings

Fig. 1 is a perspective view of a lance tip attachment mechanism according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of the lance tip attachment mechanism shown in FIG. 1, taken perpendicular to the Y-direction;

fig. 3 is a cross-sectional view of the lance tip attachment mechanism shown in fig. 1 at another angle perpendicular to the Y-direction;

FIG. 4 is a cross-sectional view of the lance tip attachment mechanism of FIG. 1 taken perpendicular to the X-direction;

FIG. 5 is an enlarged view of a portion A shown in FIG. 4;

the reference numbers indicate:

100. a gun head connecting mechanism; 110. a main housing; 112. an accommodating chamber; 120. a transfer member; 121. a transfer chamber; 130. a gun head sleeve; 132. a transfer channel; 140. a drive assembly; 141. a driving member mounting plate; 143. a drive member; 1432. a motor; 1434. a transmission screw rod; 145. a movable member; 147. a guide shaft; 150. a guide assembly; 152. a slide rail; 154. a slider; 160. a piston rod; 161. a piston rod sealing sleeve; 163. a piston rod seal ring; 170. a clamping piece; 172. a claw; 1721. a boss portion; 1723. a clamping part; 180. moving the sleeve; 183. a reset member; 190. a gun head sealing element;

200. a pipette tip; 210. a mating portion.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Referring to fig. 1, an embodiment of the present application provides a pipette device, including a driving device (not shown in the drawings) and a pipette tip connecting mechanism 100, where the driving device is in transmission connection with the pipette tip connecting mechanism 100, the pipette tip connecting mechanism 100 is used to connect a pipette tip 200, and the driving device can drive the pipette tip connecting mechanism 100 to drive the pipette tip 200 to move between different positions to implement liquid transfer.

As shown in fig. 2 to 4, the lance tip attachment mechanism 100 comprises a main housing 110, a transfer member 120, a lance tip sleeve 130, a drive assembly 140, and a piston rod 160. The transfer member 120 is accommodated in the main housing 110, one end of the tip sleeve 130 is hermetically inserted into the transfer member 120, the other end of the tip sleeve 130 extends out of the main housing 110 to be abutted to the pipette tip 200, one end of the piston rod 160 is hermetically inserted into the transfer member 120, the other end of the piston rod 160 is in transmission connection with the driving assembly 140, and the piston rod 160 can reciprocate up and down under the driving of the driving assembly 140 to generate pressure change in the pipette tip 200, so that liquid suction and discharge of the pipette tip 200 are realized.

Specifically, the main housing 110 is a substantially hollow cubic structure, and a receiving cavity 112 for receiving other components is formed in the main housing 110. It is understood that the shape of the main housing 110 is not limited and may be set as needed to meet various requirements.

In the following embodiments, the height direction of the main housing 110 is a first direction (i.e., Z direction in fig. 1), the length direction of the main housing 110 is a second direction (i.e., X direction in fig. 1), and the width direction of the main housing 110 is a third direction (i.e., Y direction in fig. 1).

The driving assembly 140 includes a driving member mounting plate 141, a driving member 143, and a movable member 145. The driving member mounting plate 141 is a rectangular plate-shaped structure, and the driving member mounting plate 141 is fixedly connected to the middle of the main housing 110 and is perpendicular to the first direction. The driving member 143 includes a motor 1432 and a transmission screw 1434, the motor 1432 is fixedly connected to the lower surface of one end of the driving member mounting plate 141 in the second direction, one end of the transmission screw 1434 is mounted at the output end of the motor, and the other end extends out of the motor 1432 and extends upward along the first direction. The movable member 145 has a cubic block structure, and one end of the movable member 145 in the second direction is coupled to one end of the transmission screw 1434 extending out of the motor 1432.

Further, the lance tip connection mechanism 100 further comprises a guide assembly 150, and the guide assembly 150 comprises a slide rail 152 and a slide block 154. The sliding rail 152 is fixedly installed in the main housing 110 and located on one side of the motor 1432 in the second direction, and the sliding rail 152 extends lengthwise along the first direction. The slider 154 is coupled to the slide rail 152 and can reciprocate along the slide rail 152 in a first direction.

In this way, the movable member 145 of the driving element 140 is coupled to one end of the driving screw 1434 and is limited on the sliding block 154. When the motor 1432 drives the transmission screw 1434 to rotate, the movable piece 145 moves back and forth along the first direction under the limit action of the sliding block 154.

Referring to fig. 2 to 4, the transfer member 120 is a cubic block structure, and the transfer member 120 is fixedly mounted on a lower surface of an end of the driving member mounting plate 141 away from the driving member 143 in the second direction. The transferring member 120 is opened with a transferring cavity 121, and the transferring cavity 121 penetrates through two opposite ends of the transferring member 120 in the first direction along the first direction.

The piston rod 160 is a circular rod-shaped structure, one end of the piston rod 160 penetrates through the driving member mounting plate 141 and is hermetically inserted into the transfer chamber 121, and the other end of the piston rod 160 is inserted into the movable member 145 of the driving member 140 and is fixed relative to the movable member 145.

In this way, the piston rod 160 is drivingly connected to the driving assembly 140, and the piston rod 160 can be driven by the driving assembly 140 to move back and forth along the first direction. When the piston rod 160 moves downward under the driving of the driving assembly 140, the volume of the transfer chamber 121 decreases to generate positive pressure; when the piston rod 160 moves upward under the driving of the driving assembly 140, the volume of the transfer chamber 121 increases to generate a negative pressure.

In a preferred embodiment, the piston rod 160 is formed of a ceramic material, and the outer circumferential surface of the piston rod 160 is smooth to reduce frictional loss between itself and other components. It will be appreciated that the material forming the piston rod 160 is not limited, and in other embodiments, the piston rod 160 may be formed of other materials, such as a metallic material.

Further, the lance tip connection mechanism 100 further comprises a piston rod gland 161 and a piston rod sealing ring 163. The piston rod sealing sleeve 161 is a hollow rotating body, and the piston rod sealing sleeve 161 is accommodated in one end of the transfer chamber 121 close to the driver mounting plate 141 and is sleeved outside the piston rod 160. The piston rod sealing ring 163 is of a ring structure and is sleeved outside the piston rod sealing sleeve 161. In this way, the entry of outside air into the transfer chamber 121 from the gap between the chamber wall of the transfer chamber 121 and the piston rod 160 can be avoided.

The lance tip sleeve 130 is of a solid-liquid structure, and the central axis of the lance tip sleeve 130 extends in a first direction. One end of the tip sleeve 130 is hermetically inserted into one end of the transfer cavity 121 far away from the driving member mounting plate 141, the other end of the tip sleeve 130 extends out of the accommodating cavity 112 to butt the pipette tip 200, and the tip sleeve 130 is provided with a transfer channel 132 extending along the first direction to communicate the transfer cavity 121 and the pipette tip 200.

In this way, when the piston rod 160 is driven by the driving assembly 140 to reciprocate in the first direction to change the air pressure in the transfer chamber 121, the air pressure in the pipette tip 200 communicating with the transfer chamber 121 through the transfer channel 132 is changed, thereby achieving the liquid transfer.

With reference to fig. 2 to 4, in order to automatically remove the pipette tip 200, the tip connection mechanism 100 of the present application further includes a clip 170.

The clamping member 170 is mounted on the main housing 110 and extends out of one end of the accommodating cavity 112 around the movable sleeve 180, the clamping member 170 comprises a plurality of claws 172, all the claws 172 are arranged at intervals along the circumference of the movable sleeve 180 to define a clamping cavity together with the outer wall of the tip sleeve 130 for clamping the pipette tip 200, and the clamping member 170 can be controllably switched between a contracted state and an expanded state. When the snap-in member 170 is in the contracted state, all the claws 172 are gathered to each other, and the inner diameter of the snap-in chamber is reduced to snap-in the pipette tip 200. When the catch 170 is in the open position, all the jaws 172 move away from each other and the inside diameter of the catch chamber increases to disengage the pipette tip 200.

So, switch between the shrink state and the state of opening through control joint spare 170, can realize the automation of pipetting gun head 200 and connect and take off, realize interconnect between them through pipetting mechanism and pipetting gun head 200's direct joint in prior art relatively, the connected mode of this application has effectively avoided because of the size deviation that the manufacturing error of pipetting gun head leads to the influence of connection stability to effectively prevent to break down among the liquid transfer process, showing and improving pipetting efficiency.

Further, in order to switch the clamping member 170 between the contracted state and the expanded state, the gun head connecting mechanism 100 further includes a movable sleeve 180 sleeved outside the gun head sleeve 130, one end of the movable sleeve 180 is located in the accommodating cavity 112, and the other end of the movable sleeve 180 is inserted into the clamping cavity. The moving sleeve 180 is controllably reciprocally movable in a first direction relative to the snap member 170 to switch between a first position and a second position, thereby switching the snap member 170 between a contracted state and an expanded state.

As shown in fig. 5, specifically, a protrusion 1721 is protruded on a surface of the clamping member 170 forming a cavity wall of the clamping cavity. When the moving sleeve 180 is at the first position, the moving sleeve 180 is away from the protrusion 1721, and the snap-in member 170 is in a contracted state. When the movable sleeve 180 is located at the second position, the outer sidewall of the movable sleeve 180 abuts against the protrusion 1721, and the locking member 170 is in an open state.

To drive the traveling sleeve 180 from the first position to the second position in the first direction, the driving assembly 140 further includes two guide shafts 147, one end of each guide shaft 147 is inserted into one end of the traveling sleeve 180 located in the receiving cavity 112, and the other end of each guide shaft 147 passes through and extends out of the transfer member 120 in the first direction.

Thus, when the driving element 143 drives the moving element 145 to move downward, the moving element 145 moves to a certain position and can be abutted against the guide shaft 147, and along with the continuous movement of the moving element 145, the guide shaft 147 can drive the moving sleeve 180 to move in the direction away from the transfer element 120 under the abutment of the moving element 145 until the outer side wall of the moving sleeve 180 abuts against the protrusion 1721 in the clamping element 170, so that the clamping element 170 is switched from the contracted state to the expanded state.

To drive the traveling sleeve 180 from the second position to the first position in the first direction, the lance tip attachment mechanism 100 further comprises a reset member 183. The reset unit 183 is abutted between the clip 170 and the movable sleeve 180, and when the reset unit 183 is in a compressed state, a force for moving the movable sleeve 180 toward the transfer unit 120 can be applied to the movable sleeve 180. When the movable member 145 moves downward against the guide shaft 147, the reset member 183 is in a compressed state and stores elastic potential energy. When the movable member 145 moves upward along the first direction and leaves the guide shaft 147, the reset member 183 releases the elastic potential energy to drive the movable sleeve 180 to move upward along the first direction until the movable sleeve 180 disengages from the protrusion 1721 in the engaging member 170, so that the engaging member 170 is switched from the expanded state to the contracted state.

Specifically, in one embodiment, the reset element 183 is a compression spring, and the compression spring is sleeved outside one end of the movable sleeve 180 located in the accommodating cavity 112. It will be appreciated that in other embodiments, the reset element 183 may be an elastic rubber or other elastically deformable member.

Further, in some embodiments, a hook-shaped clamping portion 1723 protruding into the clamping chamber is protruded from an end of each of the claws 172 away from the transfer chamber 121, a matching portion 210 matching with the clamping portion 1723 is protruded from an end of the pipette tip 200 connected to the clamping member 170, and an end wall of the clamping portion 1723 close to the transfer chamber 121 can be abutted against the matching portion 210 in the third direction to clamp the pipette tip 200. In a preferred embodiment, the latch 1723 extends obliquely towards the inner surface of the latch cavity in the direction of the central axis of the latch cavity in the direction of the movement of the movable sleeve 180 from the second position to the first position, so as to guide the movement of the pipette tip 200.

In some embodiments, the lance tip connection mechanism 100 further includes a lance tip sealing element 190, the lance tip sealing element 190 is an annular sealing ring, a circumferentially extending limiting groove is formed in an end of the lance tip sleeve 130 away from the transfer member 120, the lance tip sealing element 190 is sleeved on an end of the lance tip sleeve 130 away from the transfer member 120 and is limited in the limiting groove, and the lance tip sealing element 190 can elastically deform under an external force. The inside diameter of the fitting portion 210 of the pipette tip 200 is provided with a sealing surface extending obliquely, and the inside diameter of the fitting portion 210 gradually increases from the bottom to the top of the pipette tip 200.

Thus, when the pipette tip 200 is engaged with the engaging member 170 in the retracted state, the tip sealing member 190 is compressed by the sealing surface of the engaging portion 210 of the pipette tip 200 to close the gap between the pipette tip 200 and the tip sleeve 130. When the clamping member 170 is switched to the open state, the tip sealing member 190 releases the elastic potential energy to push the pipette tip 200 to disengage from the clamping member 170.

The application also provides a pipetting method using the gun head connecting structure 100, which comprises the following steps:

s1: the control clamping member 170 is in an open state, and the pipette tip 200 extends into the clamping cavity to be in butt joint with the tip sleeve 130.

Specifically, when the pipette head 200 needs to be connected, the guide shaft 147 presses the resetting part 183 downwards by abutting against the movable part 145, at this time, the movable sleeve 180 is located at the second position, and the outer side wall of the movable sleeve 180 abuts against the protruding part 1721 of the clamping part 170, so that the clamping part 170 is located in an open state, and the driving device can drive the pipette head connecting mechanism 100 to move above the pipette head 200 and enable the pipette head 200 to extend into the clamping cavity to be abutted against the pipette head sleeve 130.

S2: the control clip 170 is switched to the retracted state to snap-fit the pipette tip 200.

Specifically, the motor 1432 drives the transmission screw 1434 to rotate to drive the movable element 145 to move upward along the third direction and leave the guide shaft 147, the reset element 183 releases the elastic potential energy to drive the movable sleeve 180 to move upward along the first direction, and the outer side wall of the movable sleeve 180 leaves the protrusion 1721 of the catching member 170, so that the catching member 170 is switched to the retracted state to catch the pipette tip 200. At this time, the end surface of the pipette tip 200 abuts against the tip sealing member 190 and causes the tip sealing member 190 to be in a compressed state, thereby fixing and sealing the pipette tip 200.

S3: the drive piston rod 160 reciprocates in the axial direction of the tip sleeve 130, and a positive pressure or a negative pressure is generated in the transfer chamber 121 to suck or discharge the pipette tip 200.

The driving assembly 140 can drive the piston rod 160 to reciprocate along the first direction to generate positive pressure or negative pressure in the transfer chamber 121, so as to change the pressure inside the pipette tip 200, and finally realize liquid suction and discharge of the pipette tip 200.

S4: the control clip 170 switches to the open state.

Specifically, when the pipette tip 200 needs to be separated from the pipette head, the motor 1432 drives the transmission screw 1434 to rotate so as to drive the movable member 145 to move downward along the third direction until the movable member 145 abuts against the guide shaft 147, and the guide shaft 147 continues to move downward under the pushing of the movable member 145, so as to drive the movable sleeve 180 to move downward and abut against the protruding portion 1721 of the clamping member 170, so that the clamping member 170 is switched from the retracted state to the extended state.

S5: the pipette tip 200 disengages the catch 170.

Specifically, the tip seal 190 releases the elastic potential energy to push the pipette tip 200 out of engagement with the catch 170.

According to the pipette head connecting mechanism 100 and the pipetting device, the pipetting gun head 200 can be automatically taken off through the arrangement of the driving assembly 140, the movable sleeve 180, the clamping piece 170 and other components, the pipetting gun head 200 can be limited through the clamping piece 170 and the pipette head sealing piece 190 after being connected, and the pipetting gun head 200 is effectively prevented from falling off in the pipetting operation process under the condition that the internal sealing performance of the pipetting gun head 200 and the pipette head sleeve 130 is ensured. After the pipette tip 200 is used, the state of the clamping piece 170 is switched and the pipette tip 200 is separated from the pipette tip connecting mechanism 100 under the action of the elastic potential energy of the pipette tip sealing piece 190, so that the workload of manual operation is reduced on the premise of ensuring the operation stability, the pipette efficiency is improved, the maintenance cost of the pipette device is reduced, and the pipette automation degree in the field of molecular diagnosis is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.

Claims (10)

1. The utility model provides a rifle head coupling mechanism for connect the liquid-transfering gun head, its characterized in that includes:

a main housing having a receiving chamber;

the transfer piece is provided with a transfer cavity and is arranged in the accommodating cavity;

one end of the gun head sleeve is hermetically inserted in the transfer cavity, the other end of the gun head sleeve extends out of the accommodating cavity to be in butt joint with the liquid-transfering gun head, and the gun head sleeve is provided with a transfer channel for communicating the transfer cavity and the liquid-transfering gun head; and

the clamping piece is arranged on the main shell and extends out of one end of the accommodating cavity around the pipette head sleeve, the clamping piece comprises a plurality of clamping jaws, and all the clamping jaws are circumferentially arranged at intervals to define a clamping cavity for clamping the pipette head together with the outer wall of the pipette head sleeve;

the clamping piece can be controlled to switch between a contraction state and an expansion state; when the clamping piece is in the contraction state, all the clamping jaws are mutually gathered to clamp the pipette tips; when the clamping piece is in the opening state, all the clamping claws are far away from each other to be separated from the pipette head.

2. The lance tip connecting mechanism according to claim 1, further comprising a movable sleeve sleeved outside the lance tip sleeve, wherein one end of the movable sleeve is located in the accommodating cavity, and the other end of the movable sleeve is inserted into the clamping cavity;

the movable sleeve can be controlled to reciprocate relative to the clamping piece along the axial direction of the gun head sleeve, so that the clamping piece can be switched between the contraction state and the expansion state.

3. The lance head connecting mechanism according to claim 2, further comprising a driving assembly, wherein the driving assembly is accommodated in the accommodating cavity and is configured to drive the movable sleeve to move relative to the clamping member in a direction away from the transfer member, so that the clamping member is switched from the contracted state to the expanded state.

4. The lance tip attachment mechanism of claim 3, wherein the drive assembly comprises:

a drive member;

the movable piece is connected to the driving piece in a transmission mode and can reciprocate along the axial direction of the gun head sleeve under the driving of the driving piece; and

one end of the guide shaft is matched and connected with the movable sleeve, and the other end of the guide shaft penetrates through and extends out of the transfer piece;

the guide shaft can drive the movable sleeve to move towards the direction far away from the transfer piece under the propping of the movable piece.

5. The lance head connecting mechanism according to claim 4, wherein the drive assembly further comprises a piston rod, one end of the piston rod is fixedly connected to the movable member, the other end of the piston rod is sealingly inserted into the transfer chamber, and the piston rod can reciprocate along the axial direction of the lance head sleeve along with the movable member to generate positive pressure or negative pressure in the transfer chamber.

6. The lance tip connection mechanism of claim 2, further comprising a reset member, wherein the reset member abuts between the clamping member and the movable sleeve, and when the reset member is in a compressed state, an acting force for moving the movable sleeve towards the transfer member is applied to the movable sleeve, so that the jaws are switched from the expanded state to the contracted state.

7. The lance head connecting mechanism according to claim 2, wherein a convex part is convexly arranged on the wall of the clamping cavity;

when the movable sleeve is far away from the bulge part, the clamping piece is in the contraction state;

when the movable sleeve is abutted against the bulge part, the clamping piece is in the opening state.

8. The gun head connecting mechanism according to claim 1, wherein a clamping portion extending into the clamping chamber is convexly arranged at one end of the clamping jaw away from the transfer chamber, and the clamping portion is used for clamping the pipette head.

9. The lance head connecting mechanism according to claim 1, further comprising a lance head sealing element, wherein the lance head sealing element is sleeved at one end of the lance head sleeve away from the transfer element, and can elastically deform under the action of external force;

when the pipette tip is clamped in the clamping piece, the tip sealing piece is in a compressed state under the support of the pipette tip.

10. A pipetting device comprising a tip connection mechanism according to any one of claims 1 to 9 and further comprising a drive device drivingly connected to the tip connection mechanism for driving movement of the tip connection mechanism.

Images