Pipetting device and pipetting tip removing device

Abstract

The utility model relates to the field of medical equipment, in particular to a pipetting device and a pipetting suction head taking and removing device. The pipetting suction head taking and removing device comprises a mounting plate, a suction head mounting pipe, a sleeve, a first driving motor, a cam and a transmission assembly; the suction head mounting pipe is connected with the mounting plate, and the sleeve is slidably connected to the periphery of the suction head mounting pipe; the first driving motor is arranged on the mounting plate, the cam is eccentrically connected to an output shaft of the first driving motor, the transmission assembly is in transmission connection between the cam and the sleeve, the cam rotates to a telecentric point to act on the transmission assembly, and when the transmission assembly drives the sleeve to slide towards the tail end of the suction head mounting pipe, the pipetting suction head connected to the tail end of the suction head mounting pipe in a sleeving mode can be removed. According to the pipette tip taking and removing device, it is ensured that the pipette tip is smoothly removed from the tip mounting pipe, meanwhile, the requirement for motion control precision can be lowered, and the equipment cost is lowered.

Description

Technical Field

[0001] The present application relates to the field of medical equipment, and in particular to a liquid transfer device and a liquid transfer tip removal device. Background Art

[0002] A pipette, also called a pipette gun, is a measuring tool that transfers liquid from the original container to another container within a certain range. It is widely used in biochemical and medical fields.

[0003] Due to the harmfulness of the liquid being transferred, the difficulty in cleaning, or the convenience, some pipettes often use disposable tips. This type of tip is generally made of plastic and is inserted into the tip holder of the pipette during use. The tip needs to be removed from the pipette after use. This type of pipette requires frequent replacement of the pipette tip. In order to quickly replace the tip, some pipettes are equipped with a tip removal device, but there may be deviations during operation, causing damage to the pipette and affecting the service life of the pipette. Moreover, the tip removal device usually uses a drive motor and a screw mechanism as the drive mechanism for the tip removal. It is necessary to accurately control the rotation of the drive motor and the displacement and reset of the screw mechanism to ensure that the pipette tip is removed and does not affect the installation of the pipette tip after resetting. The equipment cost is relatively high. Utility Model Content

[0004] The present application provides a pipetting device and a pipetting tip removal device. The pipetting tip removal device ensures that the pipetting tip is smoothly removed from the tip mounting tube while reducing motion control accuracy requirements and equipment costs.

[0005] In a first aspect, the present application provides a device for removing and removing a pipette tip, comprising:

[0006] Mounting plate;

[0007] A suction head mounting tube connected to the mounting plate;

[0008] A sleeve is slidably sleeved on the outer periphery of the tip mounting tube, and when the sleeve slides to the end of the tip mounting tube away from the mounting plate, the pipette tip sleeved on the end of the tip mounting tube can be removed from the end of the tip mounting tube;

[0009] A first driving motor is arranged on the mounting plate;

[0010] a cam eccentrically connected to an output shaft of the first drive motor;

[0011] The transmission assembly is transmission-connected between the cam and the sleeve. When the cam rotates to the distal point and acts on the transmission assembly, the transmission assembly drives the sleeve to slide toward the end of the tip mounting tube and removes the pipette tip.

[0012] In some embodiments, the first drive motor is fixed to the upper end surface of the mounting plate, the suction head mounting tube and the sleeve extend to the lower end surface of the mounting plate; the transmission assembly includes:

[0013] A head removal guide rod, which passes through the mounting plate and abuts against the sleeve;

[0014] A lifting guide rod, fixed to the upper end surface of the mounting plate;

[0015] The head unloading plate is connected to the lifting guide rod by lifting and sliding. When the distal point of the cam abuts against the head unloading plate, the head unloading plate is driven to press down the head unloading guide rod. The head unloading guide rod abuts and drives the sleeve to slide toward the end of the suction head mounting tube.

[0016] In some embodiments, it further comprises a limit block connected to the mounting plate, the limit block is provided with a limit groove facing the mounting plate, and the end of the suction head mounting tube and the sleeve close to the mounting plate extends through and into the limit groove;

[0017] A first limiting boss is provided at one end of the sleeve close to the mounting plate. The first limiting boss is configured to rise and fall and slide in the limiting groove, and the unloading head guide rod abuts against the first limiting boss.

[0018] In some embodiments, the first end of the tip mounting tube passes through the mounting plate, and the tip mounting tube is provided with a second limiting boss, and the second limiting boss is configured to rise and fall and slide in the limiting groove; an elastic return member is abutted between the first limiting boss and the second limiting boss, and the elastic return member is used to drive the second limiting boss to abut against the mounting plate.

[0019] In some embodiments, a magnet is disposed on the cam, and a Hall sensor is further included for sensing the magnet to detect the position of the cam, and the Hall sensor is connected to a motor controller of the first drive motor.

[0020] In some embodiments, the magnet is embedded on a side of the cam close to the distal point.

[0021] In some embodiments, the limiting block is connected to a first position sensor, and the first position sensor is used to detect the position of the first limiting boss.

[0022] In some embodiments, it also includes:

[0023] frame;

[0024] A second driving motor is mounted on the frame;

[0025] A screw mechanism connects the second drive motor and the mounting plate, and is used to drive the mounting plate to move up and down relative to the frame between a first position and a second position. When the mounting plate moves from the first position to the second position, it drives the tip mounting tube to be inserted into the pipette tip to achieve the installation of the pipette tip.

[0026] In some embodiments, the frame is provided with a second position sensor, and the second position sensor is used to detect whether the mounting plate reaches the first position.

[0027] In a second aspect, the present application provides a pipetting device, comprising a plunger pump, a connecting hose, a connecting head and the above-mentioned pipetting tip removal device, wherein the plunger pump is connected to the connecting hose, and the connecting head connects the connecting hose and the tip mounting tube.

[0028] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art: the first drive motor installed on the mounting plate drives the cam to rotate when rotating, as long as the movement stroke generated by the distal point of the cam acting on the transmission component is greater than or equal to the movement stroke of the sleeve sliding toward the end of the tip mounting tube to remove the pipette tip, the number of circles driven by the first drive motor to rotate the cam is greater than or equal to one circle to ensure that the distal point of the cam abuts the transmission component at least once, that is, the pipette tip sleeved at the end of the tip mounting tube can be removed; at the same time, the appropriate distance between the proximal point of the cam and the transmission component is maintained to ensure that when the area near the proximal point of the cam corresponds to the transmission component, it does not affect the reset of the transmission component, so that the pipette tip can push the sleeve away from the end of the tip mounting tube to achieve the installation sleeve relative to the end of the tip mounting tube. The above-mentioned pipette tip removal device does not need to be driven by a high-precision motor and a screw mechanism, nor does it need to use a high-precision sensor to detect the displacement of the screw mechanism or the rotation angle of the high-precision motor, which significantly reduces the equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0032] Figure 1 A direct view of a pipetting device using a pipetting tip removal device provided in an embodiment of the present application;

[0033] Figure 2 for Figure 1 Rear view of

[0034] Figure 3 for Figure 1 AA section view.

[0035] in:

[0036] 1-first drive motor; 2-second drive motor; 3-plunger pump; 4-Hall sensor; 5-cam; 6-lifting guide rod; 7-head removal plate; 8-pipette tip; 9-head removal guide rod; 10-sleeve; 101-first limit boss; 11-pipette tip mounting tube; 111-second limit boss; 12-elastic reset member; 13-first position sensor; 14-second position sensor; 15-connecting hose; 16-connecting head; 17-mounting plate; 171-optical coupling baffle; 18-frame. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0039] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0040] In order to solve the technical problem in the prior art that the motion accuracy detection and control requirements of the driving mechanism of the tip ejection device are high, resulting in high equipment cost, the present application provides a device for removing and removing the pipette tip 8, which can reduce the motion control accuracy and detection accuracy of the driving mechanism while ensuring that the pipette tip 8 can be removed from the tip mounting tube 11, thereby reducing the equipment cost.

[0041] The present application embodiment provides a suction head removal device, such as Figures 1 to 3 As shown, the tip removal device mainly includes a mounting plate 17, a tip mounting tube 11, a sleeve 10, a first drive motor 1, a cam 5 and a transmission assembly. The first end of the tip mounting tube 11 is connected to the mounting plate 17, and the second end or the end of the tip mounting tube 11, that is, the lower end as shown in the figure, is used for the pipette tip 8 to be sleeved for installation. The sleeve 10 is slidably connected to the outer periphery of the tip mounting tube 11, and can slide from the first end of the tip mounting tube 11 to the second end, that is, the end of the tip mounting tube 11. When the sleeve 10 slides to the second end of the tip mounting tube 11, the pipette tip 8 sleeved at the end of the tip mounting tube 11 can be withdrawn from the end of the tip mounting tube 11.

[0042] The first drive motor 1 is fixed on the mounting plate 17, the cam 5 is eccentrically connected to the output shaft of the first drive motor 1, and the transmission assembly is installed through the mounting plate 17 to realize the transmission connection between the cam 5 and the sleeve 10. The cam 5 has a distal end and a proximal end, the distal end refers to the point on the periphery of the cam 5 that is farthest from its rotation axis, and the proximal point refers to the point on the periphery of the cam 5 that is closest to its rotation axis. When the cam 5 rotates to the distal point to act on the transmission assembly, the transmission assembly drives the sleeve 10 to slide toward the end of the tip mounting tube 11, so that the pipette tip 8 sleeved on the end of the tip mounting tube 11 can be taken off.

[0043] The first drive motor 1 installed on the mounting plate 17 drives the cam 5 to rotate when rotating. As long as the movement stroke generated by the distal point of the cam 5 acting on the transmission component is greater than or equal to the movement stroke of the sleeve 10 sliding toward the end of the tip mounting tube 11 to remove the pipette tip 8, the first drive motor 1 drives the cam 5 to rotate for a number of turns greater than or equal to one turn, ensuring that the distal point of the cam 5 abuts the transmission component at least once, that is, the pipette tip 8 sleeved at the end of the tip mounting tube 11 can be removed; at the same time, the proximal point of the cam 5 and the transmission component are kept at a suitable distance to ensure that when the proximal point of the cam 5 and its vicinity correspond to the transmission component, the reset of the transmission component is not affected, so that the pipette tip 8 can push the sleeve 10 from the end of the tip mounting tube 11 to move toward the transmission component, and realize the installation sleeve of the pipette tip 8 relative to the end of the tip mounting tube 11. The above-mentioned pipette tip 8 removal device does not need to be driven by a high-precision motor and a screw mechanism, nor does it need to use a high-precision sensor to detect the displacement of the screw mechanism or the rotation angle of the high-precision motor, which significantly reduces the equipment cost.

[0044] In some embodiments, Figure 2 and Figure 3 As shown, the first drive motor 1 is fixed on the upper end surface of the mounting plate 17, and the cam 5 has a preset distance from the upper end surface of the mounting plate 17 to meet the installation requirements of the transmission assembly. The tip mounting tube 11 is connected to the mounting plate 17 and extends to the lower end surface of the mounting plate 17. The first end of the tip mounting tube 11 refers to the end of the tip mounting tube 11 connected to or close to the mounting plate 17, and the second end of the tip mounting tube 11 refers to the end of the tip mounting tube 11 away from the mounting plate 17 and used to install and connect the pipette tip 8. The transmission assembly extends from the upper end surface of the mounting plate 17 through the mounting plate 17 to the lower end surface of the mounting plate 17, so as to transmit the rotation of the cam 5 driven by the first drive motor 1 to the sleeve 10 on the lower end surface of the mounting plate 17, so that the sleeve 10 can move from the first end of the tip mounting tube 11 toward the second end, that is, the end, and withdraw the pipette tip 8 sleeved on the end of the tip mounting tube 11.

[0045] In this embodiment, the transmission assembly can adopt a structure composed of a head removal plate 7, a lifting guide rod 6 and a head removal plate 7. Among them, the lifting guide rod 6 can be vertically connected to the upper end surface of the mounting plate 17, and the head removal plate 7 is arranged parallel to the mounting plate 17 and is slidably connected to the lifting guide rod 6; in other words, the head removal plate 7 can move up and down along the lifting guide rod 6 in a manner parallel to the mounting plate 17 toward or away from the mounting plate 17. In order to improve the reliability of guiding the head removal plate 7, multiple groups of lifting guide rods 6 can be arranged in parallel with each other. The head removal guide rod 9 passes through the mounting plate 17 and abuts against the first end of the sleeve 10. The head removal guide rod 9 can move up and down relative to the mounting plate 17, and the head removal guide rod 9 is located in the positive projection area of ​​the head removal plate 7 on the mounting plate 17. At the same time, in order to improve the uniformity of the head removal guide rod 9 driving the sleeve 10, two or more groups of head removal guide rods 9 can be arranged, so that the head removal guide rod 9 is evenly abutted against the outer periphery of the first end of the sleeve 10. The accompanying drawings only use two groups of head removal guide rods 9 as an example for schematic illustration.

[0046] When the second end of the tip mounting tube 11 is sleeved and installed with the pipette tip 8, the sleeve 10 is located at the first end of the tip mounting tube 11, and the head unloading guide rod 9 is lifted to the upper end surface protruding from the mounting plate 17. The head unloading guide rod 9 acts on the head unloading plate 7, so that the head unloading plate 7 rises away from the mounting plate 17 along the lifting guide rod 6. At this time, the cam 5 is driven by the output shaft of the first drive motor 1 to be in a state corresponding to the head unloading plate 7 at the pericenter or the pericenter adjacent area.

[0047] When it is necessary to remove the pipette tip 8 from the tip mounting tube 11, the first drive motor 1 drives the cam 5 to rotate so that the distal point or the adjacent area of ​​the distal point of the cam 5 can pass through the head removal plate 7 at least once. The cam 5 moves from the proximal point and its adjacent area to the distal point and its adjacent area to act on the head removal plate 7, driving the head removal plate 7 to move downward and press down the head removal guide rod 9, and the sleeve 10 is driven to move toward the end of the tip mounting tube 11 through the head removal guide rod 9, so that the pipette tip 8 connected to the end of the tip mounting tube 11 is removed from the end of the tip mounting tube 11.

[0048] It is only necessary to select a cam 5 of appropriate size, and ensure that when the distal point of the cam 5 or its adjacent area acts on the head unloading plate 7, it acts on the head unloading plate 7 and causes the movement stroke of the head unloading plate 7 to be greater than the movement stroke required by the sleeve 10 to unload the pipette tip 8; at the same time, it is ensured that when the proximal point of the cam 5 or its adjacent area corresponds to the head unloading plate 7, it does not affect the upward movement and reset of the sleeve 10, the head unloading guide rod 9 and the head unloading plate 7 when the pipette tip 8 is installed at the end of the tip mounting tube 11. During the unloading process of the pipette tip 8, the first drive motor 1 continuously drives the cam 5 to rotate, and the distal point of the cam 5 or its adjacent area passes through the head unloading plate 7 at least once, that is, the number of revolutions of the cam 5 is greater than or equal to one circle, so that there is no need to use a high-precision motor and screw mechanism, nor is there a need to use a high-precision sensor to detect the movement position of the drive mechanism, thereby significantly reducing the equipment cost.

[0049] It should be noted that the distal point of the cam 5 acts on the head unloading plate 7 so that the stroke of the head unloading plate 7 is usually slightly larger than the stroke required by the sleeve 10 to unload the pipette tip 8, thereby providing a certain movement margin to ensure that the pipette tip 8 is unloaded. At the same time, it is ensured that after long-term operation, a slight amount of wear is generated between the cam 5 and the head unloading plate 7 in time, and the movement stroke of the sleeve 10 can also be achieved to withdraw the pipette tip 8.

[0050] In order to prevent the sleeve 10 from sliding downward relative to the suction head mounting tube 11, a certain limiting structure is required. In one example, the limiting structure can be in the form of a first limiting boss 101 and a limiting groove. Specifically, the limiting block is connected to the lower end surface of the mounting plate 17. A limiting groove is provided on the side of the limiting block facing the mounting plate 17, and the first end of the suction head mounting tube 11 extends from the lower end surface of the limiting block to the limiting groove and is connected to the mounting plate 17; the first end of the sleeve 10 also extends from the lower end surface of the limiting block, that is, the end surface facing away from the mounting plate 17, to the limiting groove. The first end of the sleeve 10 is provided with a first limiting boss 101, and the first limiting boss 101 can be lifted and slid in the limiting groove and lock the first end of the sleeve 10 in the limiting groove. The lower end of the unloading head guide rod 9 corresponds to abut against the first limiting boss 101, and the unloading head guide rod 9 can push the sleeve 10 downward through the first limiting boss 101, or be driven to move upward by the first limiting boss 101 when the sleeve 10 moves upward.

[0051] Furthermore, the first end of the pipette tip mounting tube 11 is connected to the mounting plate 17 by lifting and sliding. The pipette tip mounting tube 11 is provided with a second limiting boss 111 at a preset distance near the first end thereof. The second limiting boss 111 can be lifted and slid in the limiting groove, and an elastic reset member 12 is provided between the first limiting boss 101 and the second limiting boss 111. The setting of the elastic reset member 12 enables the second limiting boss 111 to maintain a state of abutting against the mounting plate 17. The elastic reset member 12 can also cooperate with the head removal guide rod 9 to drive the sleeve 10 downward to remove the liquid transfer tip 8; when the liquid transfer tip 8 is sleeved on the pipette tip mounting tube 11, the sleeve 10 is driven to slide toward the first end of the pipette tip mounting tube 11, and the first limiting boss 101 slides upward to compress the elastic reset member 12 again, and at the same time drive the head removal guide rod 9 and the head removal plate 7 to reset. It should be noted that the elastic force generated by the compression of the elastic reset member 12 is less than the connection force between the pipette tip mounting tube 11 and the liquid transfer tip 8.

[0052] In some embodiments, the limiting block is connected to a first position sensor 13, and the first position sensor 13 is used to detect the position of the first limiting boss 101. When the pipette tip 8 is installed on the tip mounting tube 11, the sleeve 10 is pushed to move toward the first end of the tip mounting tube 11, that is, the first limiting boss 101 moves upward in the limiting groove. When the first position sensor 13 detects the first limiting boss 101, it indicates that the pipette tip 8 is installed on the tip mounting tube 11.

[0053] In some embodiments, in order to control the operation of the cam 5, a magnet is provided on the cam 5, and a Hall sensor 4 is provided at a position corresponding to the mounting plate 17 or the first drive motor 1, and the Hall sensor 4 is electrically connected to the controller of the first drive motor 1. When the cam 5 rotates, the magnet is driven to rotate, and the change in the distance between the magnet and the Hall sensor 4 enables the Hall sensor 4 to detect the change in magnetic flux, thereby realizing the detection of the position of the cam 5, so that the motor controller of the first drive motor 1 controls the rotation angle of the output shaft of the first drive motor 1, thereby adjusting the rotation of the cam 5. By arranging the magnet and the Hall sensor 4 on the cam 5, the detection and control of the movement position of the cam 5 are realized, and the cost of high-precision sensors is reduced.

[0054] Specifically, the magnet can be embedded in a position close to the distal point on the line connecting the distal point of the cam 5 and the rotation axis, or embedded in a position close to the proximal point on the line connecting the proximal point of the cam 5 and the rotation axis.

[0055] In some embodiments, the device for removing and removing the pipette tip 8 provided in the present application further includes a frame 18, a second drive motor 2 and a screw mechanism, wherein the second drive motor 2 is mounted on the frame 18, the screw mechanism is connected to the output shaft of the second drive motor 2, and the mounting plate 17 is connected to the screw mechanism, and can be lifted and lowered between the first position and the second position under the drive of the screw mechanism, thereby driving the pipette tip 8 connected to the mounting plate 17 to lift and lower. A lifting guide mechanism can be provided between the mounting plate 17 and the frame 18 as required, and the pipette tip mounting tube 11 only needs to be placed in correspondence with the pipette tip 8 on the tip bracket, and the mounting plate 17 is driven by the first drive motor 1 and the screw mechanism to move from the first position to the second position, so that the second end, i.e., the end, of the pipette tip mounting tube 11 can be plugged into the pipette tip 8, and the pipette tip 8 can be installed in place.

[0056] In addition, a second position sensor 14 is provided on the frame 18, and the second position sensor 14 is used to detect whether the mounting plate 17 has reached the first position; when the second position sensor 14 detects that the mounting plate 17 has reached the first position, the tip mounting tube 11 is retracted into the frame 18, and at this time, the first drive motor 1 can cooperate with the cam 5 and the transmission assembly to perform the unloading process of the pipette tip 8. Exemplarily, the second position sensor 14 can adopt an optical coupling sensor, and the optical coupling sensor includes a transmitting end and a receiving end relatively fixed on the frame 18, and the receiving end is used to receive the light signal emitted by the transmitting end, and an optical coupling baffle 171 is provided on the mounting plate 17; when the mounting plate 17 moves to the first position, the optical coupling baffle 171 enters between the transmitting end and the receiving end of the optical coupling sensor, blocking the receiving end from receiving the light signal, thereby realizing the detection of whether the mounting plate 17 has reached the first position.

[0057] The embodiment of the present application also provides a liquid transfer device, including a plunger pump 3, a connecting hose 15, a connecting head 16, and a device for removing and removing the liquid transfer tip 8 provided in the above embodiment, wherein the connecting head 16 is connected to the top of the tip mounting tube 11, and the connecting hose 15 is connected between the connecting head 16 and the plunger pump 3. When the end of the tip mounting tube 11 is connected to the liquid transfer tip 8 and liquid needs to be transferred, the plunger pump 3 is operated in a first direction to transfer liquid; when liquid needs to be discharged, the plunger pump 3 is driven to operate in a second direction to discharge liquid, and the first direction and the second direction are opposite, and liquid transfer is achieved by driving the plunger pump 3 to reciprocate.

[0058] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0059] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0060] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A device for removing and removing a pipette tip, characterized in that: include: Mounting plate; A suction head mounting tube connected to the mounting plate; A sleeve is slidably sleeved on the outer periphery of the tip mounting tube, and when the sleeve slides to the end of the tip mounting tube away from the mounting plate, the pipette tip sleeved on the end of the tip mounting tube can be removed from the end of the tip mounting tube; A first driving motor is arranged on the mounting plate; a cam eccentrically connected to an output shaft of the first drive motor; The transmission assembly is transmission-connected between the cam and the sleeve. When the cam rotates to the distal point and acts on the transmission assembly, the transmission assembly drives the sleeve to slide toward the end of the tip mounting tube and removes the pipette tip.

2. The device for removing and removing the pipette tip according to claim 1, characterized in that: The first drive motor is fixed to the upper end surface of the mounting plate, and the suction head mounting tube and the sleeve extend to the lower end surface of the mounting plate; the transmission assembly includes: A head removal guide rod, which passes through the mounting plate and abuts against the sleeve; A lifting guide rod, fixed to the upper end surface of the mounting plate; The head unloading plate is connected to the lifting guide rod by lifting and sliding. When the distal point of the cam abuts against the head unloading plate, the head unloading plate is driven to press down the head unloading guide rod. The head unloading guide rod abuts and drives the sleeve to slide toward the end of the suction head mounting tube.

3. The device for removing and removing the pipette tip according to claim 2, characterized in that: It also includes a limit block connected to the mounting plate, the limit block is provided with a limit groove facing the mounting plate, and the end of the suction head mounting tube and the sleeve close to the mounting plate extends through and into the limit groove; A first limiting boss is provided at one end of the sleeve close to the mounting plate. The first limiting boss is configured to rise and fall and slide in the limiting groove, and the unloading head guide rod abuts against the first limiting boss.

4. The device for removing and removing the pipette tip according to claim 3, characterized in that: The first end of the suction head mounting tube passes through the mounting plate, and the suction head mounting tube is provided with a second limiting boss, and the second limiting boss is configured to rise and fall and slide in the limiting groove; An elastic reset member is abutted between the first limiting boss and the second limiting boss, and the elastic reset member is used to drive the second limiting boss to abut against the mounting plate.

5. The device for removing and removing a pipette tip according to any one of claims 1 to 4, characterized in that: The cam is provided with a magnet and also includes a Hall sensor for sensing the magnet to detect the position of the cam. The Hall sensor is connected to the motor controller of the first drive motor.

6. The device for removing and removing the pipette tip according to claim 5, characterized in that: The magnet is embedded on one side of the cam close to the far center point.

7. The device for removing and removing the pipette tip according to claim 4, characterized in that: The limiting block is connected to a first position sensor, and the first position sensor is used to detect the position of the first limiting boss.

8. The device for removing and removing the pipette tip according to claim 1, characterized in that: Also includes: frame; A second driving motor is mounted on the frame; A screw mechanism connects the second drive motor and the mounting plate, and is used to drive the mounting plate to move up and down relative to the frame between a first position and a second position. When the mounting plate moves from the first position to the second position, it drives the tip mounting tube to be inserted into the pipette tip to achieve the installation of the pipette tip.

9. The device for removing and removing the pipette tip according to claim 8, characterized in that: The frame is provided with a second position sensor, and the second position sensor is used to detect whether the mounting plate reaches the first position.

10. A liquid transfer device, characterized in that: It comprises a plunger pump, a connecting hose, a connecting head and the pipette tip removal device according to any one of claims 1 to 9, wherein the plunger pump is connected to the connecting hose, and the connecting head connects the connecting hose and the pipette tip mounting tube.

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