CN212882499U - Suck-back prevention electronic pipettor - Google Patents

Abstract

The utility model discloses a suck-back-preventing electronic pipettor, which comprises a pipettor main body with a hollow structure, a controller arranged on the upper part of the pipettor main body, a liquid transferring head arranged on the lower part of the pipettor main body and communicated with the pipettor main body, and a solenoid valve device arranged on one side of the liquid transferring head, wherein a piston cylinder, a piston rod component, a linkage component and a screw transmission component are sequentially arranged in the pipettor main body from the liquid transferring head end to the other end, the screw transmission component is in transmission connection with the piston rod component through the linkage component, one end of the piston rod component extends into the piston cylinder and can move along the piston cylinder under the driving of the screw transmission component, the other end of the piston cylinder is communicated with the liquid transferring head, the utility model has reasonable structure and convenient use, can prevent the liquid from being sucked back, the pipetting precision is improved.

Description

Suck-back prevention electronic pipettor

Technical Field

The utility model relates to a pipettor field, concretely relates to prevent electronic pipettor of suck-back.

Background

The conventional electronic pipettor has inertia because the pivot has inertia behind the motor outage, and after cutting off the power, the motor continues to work under inertial effect, and inside piston moves backward continuously, causes liquid suck-back very easily, corrodes the pipettor, and this kind of condition appears for a long time and can lead to work efficiency, the accuracy greatly reduced of instrument. Meanwhile, under the inertia effect after the power supply of the motor is cut off, partial liquid is often sucked out, and the target liquid-transferring volume is difficult to accurately suck. Therefore, there is a need for an electronic pipette that prevents suck back and improves accuracy.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a technical scheme does: the utility model provides a prevent electronic pipettor of suck-back, includes hollow structure's pipettor main part, sets up in pipettor main part upper portion the controller, set up in pipettor main part lower part and rather than the liquid head that moves of intercommunication and set up in the solenoid valve device of moving liquid head one side, be equipped with piston cylinder, piston rod subassembly, linkage subassembly, screw drive subassembly in proper order by moving liquid head end to the other end in the pipettor main part, the screw drive subassembly passes through the linkage subassembly and is connected with the transmission of piston rod subassembly, piston rod subassembly one end stretches into in the piston cylinder and can move along the piston cylinder under screw drive subassembly's drive, the piston cylinder other end with move liquid head.

As an improvement, the screw transmission assembly comprises a motor frame, a motor and a screw, the motor is fixed on the motor frame through a bolt, one end of the screw is connected with the output shaft of the motor, and the other end of the screw is in transmission connection with the linkage assembly.

As an improvement, the linkage assembly comprises guide stop blocks, moving rings and linkage rods, the guide stop blocks are arranged on two sides of the screw and connected with the bottom of the motor frame, the moving rings are arranged outside the screw in a matched mode, two ends of the moving rings penetrate through the guide stop blocks, the linkage rods are arranged on one side, close to the piston cylinder, of the moving rings, and the tail ends of the linkage rods are provided with moving plates connected with the piston rod assemblies.

As an improvement, the piston rod assembly comprises a piston rod fixed on the movable plate and a piston head arranged at the tail end of the piston rod, and the piston head is arranged in the piston cylinder and is tightly connected with the inner wall of the piston cylinder.

As the improvement, solenoid valve device includes and moves the foraminiferous baffle of liquid head intercommunication, be equipped with quiet case, movable valve core, spring and sealing plug in the foraminiferous baffle, quiet case sets up in the one end of keeping away from the liquid head that moves of foraminiferous baffle, movable valve core and quiet case set up relatively, and its one end of keeping away from quiet case is passed through the connecting rod and is connected with the sealing plug, the connecting rod has cup jointed the spring outward, the connecting rod bottom is equipped with the guide holder, the spring is close to the one end and the guide holder of moving the case and is connected.

As an improvement, the static valve core is an electromagnet, the movable valve core is magnetic metal, the sealing plug can cover a pipe orifice of the liquid transferring head communicated with the piston cylinder in an initial state, and when the static valve core is electrified, the movable valve core drives the sealing plug to move through the connecting rod, so that the liquid transferring head is communicated with the piston cylinder.

As an improvement, the screw transmission assembly and the electromagnetic valve device are electrically connected with the controller, and a start-stop button electrically connected with the controller is further arranged outside the liquid transfer device main body.

As an improvement, one end of the liquid transferring device main body, which is provided with the controller, is also provided with a finger supporting part and a gun arranging head device.

After the structure more than adopting, the utility model has the advantages of as follows: the utility model discloses rational in infrastructure, convenient to use, accessible solenoid valve device prevent that liquid from inhaling the corruption pipettor backward, and the inertia of having got rid of the motor simultaneously has improved the liquid removal precision to moving the influence of liquid volume.

Drawings

Fig. 1 is a schematic structural view of the anti-suck-back electronic pipette of the present invention.

Fig. 2 is a schematic structural view of the anti-suck-back electronic pipette piston head in a rising state.

Fig. 3 is a schematic structural diagram of a closed state of a sealing plug in the suck-back prevention electronic pipette.

Fig. 4 is a schematic diagram of the structure of the utility model of opening the sealing plug in the suck-back prevention electronic pipette.

Fig. 5 is an external schematic structural view of the suck-back prevention electronic pipette of the present invention.

Fig. 6 is a schematic view of a panel of a controller in an anti-suck back electronic pipettor of the present invention.

As shown in the figure: 1. the liquid transfer device comprises a liquid transfer main body, a controller, a liquid transfer head, a magnetic valve device, a 4.1 baffle with holes, a 4.2 static valve core, a 4.3 dynamic valve core, a 4.4 spring, a 4.5 sealing plug, a 4.6 connecting rod, a 4.7 guide seat, a 5 piston cylinder, a 6 piston rod component, a 6.1 piston rod, a 6.2 piston head, a 7 linkage component, a 7.1 guide stop dog, a 7.2 moving ring, a 7.3 linkage rod, a 7.4 moving plate, a 8 screw rod transmission component, a 8.1 motor frame, a 8.2 motor, a 8.3 screw rod, a 9 start-stop key, a 10 finger supporting part, a 11 gun head arranging device.

Detailed Description

Combine the attached drawing, an anti-suck-back electron pipettor, including hollow structure's pipettor main part 1, set up in pipettor main part 1 upper portion controller 2, set up in pipettor main part 1 lower part and rather than move liquid head 3 that communicates and set up in the solenoid valve device 4 of moving liquid head 3 one side, be equipped with piston cylinder 5, piston rod assembly 6, linkage subassembly 7, screw drive subassembly 8 by moving liquid head end to the other end in proper order in pipettor main part 1, screw drive subassembly 8 is connected with 6 transmissions of piston rod assembly through linkage subassembly 7, 6 one end of piston rod assembly stretches into in the piston cylinder 5 and can move along piston cylinder 5 under screw drive subassembly 8's drive, 5 other ends of piston cylinder with move liquid head 3 intercommunication.

As a preferred embodiment of this embodiment, the screw transmission assembly 8 includes a motor frame 8.1, a motor 8.2, and a screw 8.3, the motor 8.2 is fixed on the motor frame 8.1 by a bolt, one end of the screw 8.3 is connected to the motor output shaft, and the other end is in transmission connection with the linkage assembly 7.

As a preferred embodiment of this embodiment, the linkage assembly 7 includes a guide stopper 7.1, a moving ring 7.2, and a linkage rod 7.3, the guide stopper 7.1 is disposed on two sides of the screw 8.3 and connected to the bottom of the motor frame 8.1, the moving ring 7.2 is disposed outside the screw 8.3 in a matching manner, and two ends of the moving ring penetrate through the guide stopper 7.1, the linkage rod 7.3 is disposed on one side of the moving ring 7.2 close to the piston cylinder 5, and a moving plate 7.4 connected to the piston rod assembly 6 is disposed at the end of the linkage rod.

As a preferred embodiment of the embodiment, the piston rod assembly 6 comprises a piston rod 6.1 fixed on the moving plate 7.4 and a piston head 6.2 arranged at the end of the piston rod 6.1, and the piston head 6.2 is arranged in the piston cylinder 5 and tightly connected with the inner wall of the piston cylinder 5.

As a preferred embodiment of the present embodiment, the electromagnetic valve device 4 includes a perforated baffle 4.1 communicated with the liquid-transferring head 3, a stationary valve core 4.2, a movable valve core 4.3, a spring 4.4 and a sealing plug 4.5 are arranged in the perforated baffle 4.1, the stationary valve core 4.2 is arranged at one end of the perforated baffle 4.1 far away from the liquid-transferring head 3, the movable valve core 4.3 is arranged opposite to the stationary valve core 4.2, one end of the movable valve core far away from the stationary valve core 4.2 is connected with the sealing plug 4.5 through a connecting rod 4.6, the spring 4.4 is sleeved outside the connecting rod 4.6, a guide seat 4.7 is arranged at the bottom of the connecting rod 4.6, and one end of the spring 4.4 close to the movable valve core 4.3 is connected with the guide seat 4.

As a preferred embodiment of this embodiment, the static valve core 4.2 is an electromagnet, the dynamic valve core 4.3 is a magnetic metal, in an initial state, the sealing plug 4.5 can cover a pipe orifice of the pipetting head 3 communicated with the piston cylinder 5, and when the static valve core 4.2 is powered on, the dynamic valve core 4.3 drives the sealing plug 4.5 to move through the connecting rod 4.6, so that the pipetting head 3 is communicated with the piston cylinder 5.

As a preferred embodiment of this embodiment, the screw transmission assembly 8 and the electromagnetic valve device 4 are electrically connected to the controller 2, and the pipette main body 1 is further provided with a start/stop button 9 electrically connected to the controller 2.

As a preferred embodiment of this embodiment, the pipette body 1 is further provided with a finger support 10 and a gun head device 11 at one end where the controller 2 is disposed.

The principle of the utility model is that: the liquid transfer volume is set through the controller, the liquid suction button in the start-stop button is pressed to start working, and the controller can select the existing PLC according to specific conditions; when the motor starts to work, the screw rod is positively driven to rotate, so that the linkage assembly in transmission connection with the screw rod moves upwards along the screw rod, and the linkage assembly drives the piston rod and the piston head to move upwards, so that negative pressure is generated in the piston rod; when the motor is electrified, the electromagnetic valve device starts to work, a static valve core generates magnetic force after being electrified, the movable valve core is attracted to move, a sealing plug connected with the movable valve core moves along with the movable valve core, at the moment, the spring is compressed, the sealing plug is moved away, and the liquid transfer device starts to suck liquid; when the target liquid displacement amount is reached, the electromagnetic valve device is powered off, the magnetic force of the static valve core disappears, and the sealing plug rebounds and seals under the action of the spring to prevent liquid from being sucked backwards; because the upper end of the sealing plug is open and is communicated with the baffle plate with the hole, the negative pressure in the piston rod is relieved after the electromagnetic valve is closed, thereby avoiding the suck-back of liquid when the electromagnetic valve is opened again; when liquid needs to be discharged, the liquid discharging key in the start-stop key is pressed for a long time, and liquid discharging is started; at the moment, the motor drives the rotating screw rod in the reverse direction, and the piston rod and the piston head are driven to move downwards through the linkage device; when the power is on, the electromagnetic valve is opened again by the principle, and after the liquid drainage is finished, the liquid drainage button is released, and the valve is automatically closed; if the target liquid-transferring volume is not set, when liquid is sucked and discharged according to the requirement, the start-stop button can be directly pressed for a long time after the machine is started, and the process is finished immediately after the button is released.

The motor of the electronic pipettor rotates at a constant speed, the principle of setting according to volume parameters of liquid to be moved is that the number of turns of the rotation of the motor and the energizing time are set according to the volume, and meanwhile, because the closing time and the opening time of the electromagnetic valve need to be considered, the volume of the liquid sucked by the closing time and the opening time of the electromagnetic valve is subtracted when the parameters are set, and the volume is constant Q and is small.

The calculation formula is as follows:

volume of pipetting is screw pitch number of revolutions piston cross-sectional area-Q

The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.

Claims (8)

1. The utility model provides a prevent electronic pipettor of suck-back which characterized in that, includes hollow structure's pipettor main part, sets up in pipettor main part upper portion the controller, set up in pipettor main part lower part and rather than the liquid head that moves of intercommunication and set up in the solenoid valve device of moving liquid head one side, be equipped with piston cylinder, piston rod subassembly, linkage subassembly, screw drive subassembly in the pipettor main part by moving liquid head end to the other end in proper order, the screw drive subassembly passes through the linkage subassembly and is connected with the transmission of piston rod subassembly, piston rod subassembly one end stretches into in the piston cylinder and can move along the piston cylinder under screw drive subassembly's drive, the piston cylinder other end with move liquid head.

2. The electronic pipette of claim 1, wherein the screw transmission assembly comprises a motor frame, a motor and a screw, the motor is fixed on the motor frame through a bolt, one end of the screw is connected with the motor output shaft, and the other end of the screw is in transmission connection with the linkage assembly.

3. The electronic pipette of claim 2, wherein the linkage assembly comprises guide stoppers, moving rings and linkage rods, the guide stoppers are arranged on two sides of the screw and connected with the bottom of the motor frame, the moving rings are arranged outside the screw in a matching way, two ends of the moving rings penetrate through the guide stoppers, the linkage rods are arranged on one side of the moving rings close to the piston cylinder, and the tail ends of the linkage rods are provided with moving plates connected with the piston rod assemblies.

4. The electronic pipette of claim 3, wherein the piston rod assembly comprises a piston rod fixed on the moving plate and a piston head arranged at the end of the piston rod, and the piston head is arranged in the piston cylinder and tightly connected with the inner wall of the piston cylinder.

5. The electronic pipette of claim 1, wherein the electromagnetic valve device comprises a perforated baffle communicated with the pipette head, a static valve element, a dynamic valve element, a spring and a sealing plug are arranged in the perforated baffle, the static valve element is arranged at one end of the perforated baffle far away from the pipette head, the dynamic valve element and the static valve element are arranged oppositely, one end of the static valve element far away from the static valve element is connected with the sealing plug through a connecting rod, the spring is sleeved outside the connecting rod, a guide seat is arranged at the bottom of the connecting rod, and one end of the spring close to the dynamic valve element is connected with the guide seat.

6. The electronic pipette of claim 5, wherein the static valve element is an electromagnet, the dynamic valve element is a magnetic metal, the sealing plug can cover a pipe orifice through which the pipette head is communicated with the piston cylinder in an initial state, and when the static valve element is energized, the dynamic valve element drives the sealing plug to move through the connecting rod, so that the pipette head is communicated with the piston cylinder.

7. The electronic pipette of claim 1, wherein the screw transmission assembly and the solenoid valve device are electrically connected to a controller, and a start/stop button electrically connected to the controller is further disposed outside the pipette body.

8. The electronic pipette for preventing back suction according to claim 1, wherein a finger support and a gun head device are further provided at one end of the pipette body where the controller is provided.

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