Oscillating centrifuge device

Abstract

The application discloses a kind of concussion centrifugal devices, it is related to agricultural product detection technical field, including: drive device, support ring, eccentric connecting shaft and eccentric sleeve, the output shaft of drive device is connected with eccentric connecting shaft, eccentric sleeve is sleeved on eccentric connecting shaft, support ring is sleeved on the output shaft of drive device, support ring is fixedly connected with eccentric sleeve by elastic member;Eccentric sleeve is also provided with mounting piece, the first locking device is arranged between the eccentric sleeve and the eccentric connecting shaft, the second locking device is arranged between the output shaft and the support ring, and, in the concussion state, the first locking device and the second locking device are all in the unlocking state;In centrifugal state, the first locking device and the second locking device are all in the locking state.The application can reduce cost, and can improve concussion effect.

Description

Technical Field

[0001] This invention relates to the field of agricultural product testing technology, and in particular to a shaking centrifuge device. Background Technology

[0002] In the QuECHERS (Quick, Easy, Cheap, Effective, Rugged, Safe) pretreatment process for determining the residues of 208 pesticides and metabolites in plant-derived foods, the sample preparation process typically includes two steps: extraction and purification. Extraction aims to transfer as many analytes as possible from the sample into a liquid, obtaining the so-called extract. Purification, on the other hand, separates the analytes from other impurities in the extract, yielding a pure supernatant. Currently, shaking and centrifugation are the most widely used methods for extraction and purification.

[0003] Patent application number 201910064777.7 discloses a shaking centrifuge. This design uses two motors to achieve shaking and centrifugation functions. Specifically, a first motor achieves high-speed rotation to achieve centrifugation, while a second motor is mounted on an electric sliding platform. The sliding platform moves below the turntable, fixing the centrifuge tube sleeve to achieve up-and-down shaking. After shaking ends, the electric sliding platform, carrying the second shaking motor, moves away. However, this design only achieves up-and-down shaking, significantly limiting its frequency and angle. The shaking is often insufficient, reducing sample recovery rates. Furthermore, the use of a dual-motor design greatly increases costs. Summary of the Invention

[0004] The purpose of this invention is to provide a oscillating centrifuge device to solve the problems existing in the prior art, reduce costs, and improve the oscillation effect.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a oscillating centrifuge device, comprising: a driving device, a support ring, an eccentric connecting shaft, and an eccentric bushing. The output shaft of the driving device is connected to the eccentric connecting shaft, the eccentric bushing is sleeved on the eccentric connecting shaft, and the support ring is sleeved on the output shaft of the driving device. The support ring is fixedly connected to the eccentric bushing via an elastic element. The eccentric bushing also has a mounting component for mounting sample centrifuge tubes.

[0007] A first locking device is provided between the eccentric bushing and the eccentric connecting shaft, and a second locking device is provided between the output shaft and the support ring.

[0008] In the oscillation state, both the first locking device and the second locking device are in the unlocked state, and the eccentric bushing and the eccentric connecting shaft, as well as the output shaft and the support ring, rotate relative to each other.

[0009] In centrifugal mode, both the first locking device and the second locking device are locked, and the eccentric bushing, the eccentric connecting shaft, the output shaft, and the support ring rotate synchronously.

[0010] Preferably, the first locking device is installed on the eccentric connecting shaft, and the eccentric connecting shaft can be locked to the eccentric bushing by the first locking device.

[0011] Preferably, the first locking device is an electromagnetic lock, and a limiting hole is provided on the eccentric bushing. The locking tongue of the electromagnetic lock can extend into the limiting hole to lock the eccentric connecting shaft and the eccentric bushing.

[0012] Furthermore, when the latch of the electromagnetic lock extends into the limiting hole, the eccentric directions of the eccentric connecting shaft and the eccentric bushing are opposite, and the center of mass of the assembly formed by the eccentric bushing and the eccentric connecting shaft is located on the axis of the output shaft of the driving device.

[0013] Preferably, the electromagnetic lock is normally open when the power is off, and the latch of the electromagnetic lock can extend into the limiting hole to lock the eccentric connecting shaft and the eccentric bushing.

[0014] The electromagnetic lock is normally closed when energized, and the latch of the electromagnetic lock retracts so that the eccentric connecting shaft can rotate relative to the eccentric bushing.

[0015] Preferably, the output shaft of the drive device is rotatably connected to the support ring via a first bearing.

[0016] Preferably, the first bearing is a one-way bearing, the outer ring of the one-way bearing is provided with the support ring, and the one-way locking mechanism between the outer ring and the inner ring of the one-way bearing constitutes the second locking device.

[0017] Preferably, the eccentric connecting shaft is rotatably connected to the eccentric bushing via a second bearing.

[0018] Preferably, the second bearing is a thrust bearing.

[0019] Preferably, the elastic element is an elastic rubber ring.

[0020] Preferably, the mounting component is an angle rotor, which is perpendicular to the output shaft of the drive device in the initial state.

[0021] The present invention achieves the following technical effects compared to the prior art:

[0022] When both the first and second locking devices are in the unlocked state, the output shaft and eccentric connecting shaft of the drive device are disengaged from the eccentric bushing and the mounting parts. Under the restraint of the support ring and the elastic element, the eccentric bushing and the mounting parts cause the sample centrifuge tube to form a violent oscillation around an 8. This is more violent than simple up-and-down or left-and-right oscillation, resulting in a higher sample recovery rate. Moreover, it can also grind and break the sample with the grinding balls inside the sample centrifuge tube.

[0023] When both the first locking device and the second locking device are in the locked state, the output shaft of the drive device, the support ring, the eccentric connecting shaft, the eccentric bushing, the mounting parts, the sample centrifuge tube and the elastic parts form a whole, and the sample centrifuge tube is centrifuged under the high-speed rotation of the output shaft of the drive device.

[0024] This invention uses a single drive device to achieve both oscillation and centrifugation, reducing costs and improving work efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the oscillating centrifuge device in an embodiment of the present invention;

[0027] Figure 2 This is a diagram illustrating the effect of the oscillating centrifuge device during oscillation in an embodiment of the present invention.

[0028] Figure 3 This is a diagram showing the effect of the oscillating centrifuge device during centrifugation in an embodiment of the present invention.

[0029] In the figure: 1-output shaft, 2-support ring, 3-elastic rubber ring, 4-eccentric connecting shaft, 5-thrust bearing, 6-eccentric bushing, 7-electromagnetic lock, 8-angle rotor, 9-sample centrifuge tube. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The purpose of this invention is to provide a oscillating centrifuge device to solve the problems existing in the prior art, reduce costs, and improve the oscillation effect.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] like Figures 1-3 As shown, this embodiment provides a vibrating centrifuge device, including: a driving device, a support ring 2, an eccentric connecting shaft 4, and an eccentric bushing 6. The output shaft 1 of the driving device is connected to the eccentric connecting shaft 4, and the driving device can drive its output shaft 1 to rotate, further driving the eccentric connecting shaft 4 to rotate. The eccentric bushing 6 is sleeved on the eccentric connecting shaft 4, and the eccentric connecting shaft 4 can rotate relative to the eccentric bushing 6. The support ring 2 is sleeved on the output shaft 1 of the driving device, and the output shaft 1 of the driving device can rotate relative to the support ring 2. The top of the support ring 2 is fixedly connected to the bottom of the eccentric bushing 6 by an elastic element. The eccentric bushing 6 is also provided with an mounting component for mounting a sample centrifuge tube 9, which is used to hold a sample. Further, it should be noted that in this embodiment, the driving device is preferably a drive motor. The output shaft 1 of the drive motor is vertically arranged, and the support ring 2 is horizontally sleeved on the output shaft 1 of the drive motor. The bottom surface of the eccentric bushing 6 and the bottom surface of the thrust bearing 5 (hereinafter referred to as the bottom surface) have an angle with the top surface of the support ring 2 (i.e., not parallel to the support ring 2). The eccentric connecting shaft 4 is connected to the top of the output shaft 1 of the drive motor. The axis of the eccentric connecting shaft 4 is eccentrically set with respect to the axis of the output shaft 1 of the drive motor, and the eccentric angle of the eccentric bushing 6 and the eccentric connecting shaft 4 is the same.

[0035] In this embodiment, a first locking device is provided between the eccentric bushing 6 and the eccentric connecting shaft 4, and a second locking device is provided between the output shaft 1 and the support ring 2. In the oscillation state, both the first locking device and the second locking device are in the unlocked state, and the eccentric bushing 6 and the eccentric connecting shaft 4, as well as the output shaft 1 and the support ring 2, rotate relative to each other. In the centrifugal state, both the first locking device and the second locking device are in the locked state, and the eccentric bushing 6 and the eccentric connecting shaft 4, as well as the output shaft 1 and the support ring 2, rotate synchronously.

[0036] In this embodiment, when both the first locking device and the second locking device are in the unlocked state, the output shaft 1 and the eccentric connecting shaft 4 of the drive device are disengaged from the eccentric bushing 6 and the mounting part. Under the restraint and restraint of the support ring 2 and the elastic element, the eccentric bushing 6 and the mounting part cause the sample centrifuge tube 9 to form a violent oscillation around the figure 8. Compared with simple up-down and left-right oscillation, it is more violent, resulting in a higher sample recovery rate. It can also make the grinding balls in the sample centrifuge tube 9 grind and break the sample.

[0037] When both the first locking device and the second locking device are in the locked state, the output shaft 1 of the drive device, the support ring 2, the eccentric connecting shaft 4, the eccentric bushing 6, the mounting parts, the sample centrifuge tube 9 and the elastic parts form a whole. Under the high-speed rotation of the output shaft 1 of the drive device, the sample centrifuge tube 9 is centrifuged.

[0038] This embodiment uses a single drive device to achieve oscillation and centrifugation, reducing costs and improving work efficiency.

[0039] In a preferred embodiment, the first locking device is mounted on the eccentric connecting shaft 4, and the eccentric connecting shaft 4 can be locked to the eccentric bushing 6 by the first locking device. Specifically, the first locking device is an electromagnetic lock 7, which is mounted on the top of the eccentric connecting shaft 4, while the top of the eccentric bushing 6 is higher than the eccentric connecting shaft 4. A limiting hole is formed on the inner wall of the portion of the eccentric bushing 6 that is higher than the eccentric connecting shaft 4. The locking tongue of the electromagnetic lock 7 can extend into the limiting hole to lock the eccentric connecting shaft 4 and the eccentric bushing 6. Moreover, when the locking tongue of the electromagnetic lock 7 extends into the limiting hole, the eccentric directions of the eccentric connecting shaft 4 and the eccentric bushing 6 are opposite, and the center of mass of the assembly formed by the eccentric bushing 6 and the eccentric connecting shaft 4 is located on the axis of the output shaft 1 of the driving device.

[0040] Furthermore, in this embodiment, the electromagnetic lock 7 is normally open when the power is off, and the latch of the electromagnetic lock 7 can extend into the limiting hole to lock the eccentric connecting shaft 4 and the eccentric bushing 6; the electromagnetic lock 7 is normally closed when the power is on, and the latch of the electromagnetic lock 7 retracts so that the eccentric connecting shaft 4 can rotate relative to the eccentric bushing 6.

[0041] In this embodiment, during high-speed centrifugation, after the electromagnetic lock 7 is de-energized, the locking tongue enters the limiting hole of the eccentric bushing 6 to achieve a fixed connection, which is more reliable. Even if there is a sudden power failure during the centrifugation process, the electromagnetic lock 7 will pop out when de-energized, which will not cause the output shaft 1 of the drive device to become disengaged from the mounting part, thus achieving a safe centrifugation shutdown.

[0042] In this embodiment, other first locking devices can also be selected, such as hydraulic cylinders or electric actuators, which lock by extending the telescopic rod and release by retracting the telescopic rod.

[0043] In this embodiment, the output shaft 1 of the drive device is rotatably connected to the support ring 2 via a first bearing; wherein, the first bearing is preferably a one-way bearing, enabling the output shaft 1 of the drive device to rotate unidirectionally relative to the support ring 2, preferably clockwise. The support ring 2 is provided on the outer ring of the one-way bearing, and the one-way locking mechanism between the outer ring and the inner ring of the one-way bearing constitutes the second locking device. When the output shaft 1 rotates counterclockwise, the one-way locking mechanism between the outer ring and the inner ring of the one-way bearing is in a locked state, thereby enabling the output shaft 1 to drive the support ring 2 to rotate synchronously.

[0044] In this embodiment, the eccentric connecting shaft 4 is rotatably connected to the eccentric bushing 6 via a second bearing; wherein, the second bearing is preferably a thrust bearing.

[0045] In this embodiment, the elastic element is preferably an elastic rubber ring 3, or the elastic element can also be a spring, with multiple springs evenly distributed along the circumference.

[0046] In this embodiment, the mounting component is preferably an angle rotor 8, which can improve the centrifugal effect; in the initial state (the state before operation), the angle rotor 8 is perpendicular to the output shaft 1 of the drive device.

[0047] The working process of the shaking centrifuge device in this embodiment is as follows:

[0048] like Figure 2As shown, when the oscillation program is started: the output shaft 1 of the drive motor rotates clockwise, the first bearing is in the normal open state, the electromagnetic lock 7 is energized and the locking tongue automatically retracts, disengaging from the limiting hole of the eccentric bushing 6; at this time, the output shaft 1 of the drive motor, the eccentric connecting shaft 4 and the electromagnetic lock 7 rotate clockwise, while the support ring 2 is in the locked state, the eccentric bushing 6 is fixed by the support ring 2 and is not driven by the output shaft 1 of the drive motor, the support ring 2, the elastic rubber ring 3, the eccentric bushing 6, the angular rotor 8 and the sample centrifuge tube 9 are disturbed by the eccentric connecting shaft 4 as a whole, and under the action of the thrust bearing 5, a certain regular figure-eight vibration is formed, that is, under the action of the thrust bearing 5, the sample centrifuge tube 9 is subjected to the forward force of the eccentric connecting shaft 4 (forward along the rotation direction), and at the same time is subjected to the backward restraining force of the fixed elastic rubber ring 3, as well as the up and down fluctuation of the eccentric angle, which together produce the figure-eight vibration effect. The sample, extraction solvent, and homogenates in the centrifuge tube 9 undergo mixing and extraction processes under intense vibration. By increasing the speed of the drive motor, the resulting intense vibrations allow the sample in the centrifuge tube 9 to be ground and broken down under the intense impact and friction of the grinding balls.

[0049] like Figure 3 As shown, when the centrifugation program is started: the output shaft 1 of the drive motor rotates counterclockwise, the first bearing is locked, the electromagnetic lock 7 is de-energized and the locking tongue automatically pops out, entering the limiting hole of the eccentric bushing 6 to form a fixed position. At this time, the output shaft 1 of the drive motor, the support ring 2, the eccentric connecting shaft 4, the electromagnetic lock 7, the eccentric bushing 6, the angle rotor 8, the sample centrifuge tube 9, and the elastic rubber ring 3 form a whole. The eccentric directions of the eccentric connecting shaft 4 and the eccentric bushing 6 are exactly opposite, and the center of mass of the assembly formed by the eccentric bushing 6 and the eccentric connecting shaft 4 is located on the axis of the output shaft 1 of the drive motor. The angle rotor 8 is perpendicular to the output shaft 1 of the drive motor. The sample centrifuge tube 9 rotates counterclockwise at high speed under the drive of the output shaft 1 of the drive motor, generating centrifugal force, which separates the target sample through centrifugation.

[0050] In this embodiment, pesticide residue samples can be extracted, purified, and separated by repeated alternating shaking and centrifugation.

[0051] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A swing centrifuge apparatus, characterized by: include: The device comprises a drive unit, a support ring, an eccentric connecting shaft, and an eccentric bushing. The output shaft of the drive unit is connected to the eccentric connecting shaft. The eccentric bushing is sleeved on the eccentric connecting shaft. The support ring is sleeved on the output shaft of the drive unit. The support ring is fixedly connected to the eccentric bushing via an elastic element. The eccentric bushing is also provided with an mounting component for mounting sample centrifuge tubes. A first locking device is provided between the eccentric bushing and the eccentric connecting shaft, and a second locking device is provided between the output shaft and the support ring. In the oscillation state, both the first locking device and the second locking device are in the unlocked state, and the eccentric bushing and the eccentric connecting shaft, as well as the output shaft and the support ring, rotate relative to each other. In centrifugal state, both the first locking device and the second locking device are locked, and the eccentric bushing and the eccentric connecting shaft, as well as the output shaft and the support ring, rotate synchronously. The first locking device is mounted on the eccentric connecting shaft, and the eccentric connecting shaft can be locked to the eccentric bushing through the first locking device; the first locking device is an electromagnetic lock, and the eccentric bushing has a limit hole, and the locking tongue of the electromagnetic lock can extend into the limit hole to realize the locking of the eccentric connecting shaft and the eccentric bushing; and when the locking tongue of the electromagnetic lock extends into the limit hole, the eccentric directions of the eccentric connecting shaft and the eccentric bushing are opposite, and the center of mass of the assembly formed by the eccentric bushing and the eccentric connecting shaft is located on the axis of the output shaft of the driving device; The electromagnetic lock is normally open when the power is off, and the latch of the electromagnetic lock can extend into the limiting hole to lock the eccentric connecting shaft and the eccentric bushing; the electromagnetic lock is normally closed when the power is on, and the latch of the electromagnetic lock retracts so that the eccentric connecting shaft can rotate relative to the eccentric bushing. The output shaft of the drive device is rotatably connected to the support ring via a first bearing. The first bearing is a one-way bearing. The support ring is provided on the outer ring of the one-way bearing. The one-way locking mechanism between the outer ring and the inner ring of the one-way bearing constitutes the second locking device. The eccentric connecting shaft is rotatably connected to the eccentric bushing via the second bearing.

2. The oscillating centrifugal device of claim 1, wherein: The second bearing is a thrust bearing.

3. The oscillating centrifuge device according to claim 1, characterized in that: The elastic element is an elastic rubber ring.

4. The oscillating centrifuge device according to claim 1, characterized in that: The mounting component is an angle rotor, which is perpendicular to the output shaft of the drive device in the initial state.

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