CN116295748A

CN116295748A - Dispensing metering device

Info

Publication number: CN116295748A
Application number: CN202310552368.8A
Authority: CN
Inventors: 卓力
Original assignee: Imotion Shanghai Product Design Co ltd
Current assignee: Imotion Shanghai Product Design Co ltd
Priority date: 2023-05-17
Filing date: 2023-05-17
Publication date: 2023-06-23
Anticipated expiration: 2043-05-17
Also published as: CN116295748B

Abstract

An embodiment of the present invention provides a dispensing metering device, including: a base; a dispensing mechanism mounted to the base and adapted to dispense an output of the reagent to be metered; a weighing mechanism located below the dispensing mechanism and comprising: a test tube holder adapted to fix a test tube and to receive a reagent through the test tube; a weighing unit located below the test tube holder and adapted to measure the mass of the reagent when the test tube holder is supported thereon; the tray is suitable for supporting the test tube seat and driving the test tube seat to lift so as to separate or support the test tube seat from the weighing unit. By adopting the embodiment of the invention, the weighing mechanism is arranged below the distribution mechanism, so that the automatic weighing can be performed while sampling; moreover, the test tube seat can be driven to lift through the tray, so that the weighing unit only loads the test tube and the test tube seat when weighing is needed, and the test tube seat are not needed when weighing is not needed, so that the influence on the usability of the weighing unit due to long-term load is avoided.

Description

Dispensing metering device

Technical Field

The invention relates to the technical field of reagent distribution and metering, in particular to a distribution and metering device.

Background

It is well known that in biochemical experiments, it is often necessary to perform a weighing and sampling operation on reagents, especially powdered reagents. However, the weighing units commonly used at present not only need manual operation, but also have low accuracy and large error. Moreover, since the manual operation is performed, the sample is taken by the sense of a person every time the operation is performed, and thus it may be difficult to achieve an ideal weighing and sampling effect through a plurality of operations.

Patent documents of application publication numbers CN115541913A, CN115508575A and CN115508574a disclose a sample loading mechanism, a sample loading device, and a sample loading device, respectively. Although the mass flow rate of the sampling reagent can be controlled by adjusting the movement speed of the conveying mechanism, the sampling mechanism, the sampler and the sampling device can automatically and accurately sample the reagent, especially the powder reagent, but cannot automatically weigh the sample at the same time.

Disclosure of Invention

The embodiment of the invention provides a distribution metering device, which not only can realize synchronous automatic weighing while sampling, but also can protect a weighing unit used for weighing from loading test tubes and test tube seats only when weighing is needed, and does not need to load the test tubes and the test tube seats when weighing is not needed so as to avoid influencing the service performance due to long-term loading.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

a dispensing metering device. The dispensing metering device includes: a base; a dispensing mechanism mounted to the base and adapted to dispense an output of a reagent to be metered; a weighing mechanism located below the dispensing mechanism and comprising: a test tube holder adapted to fix a test tube and to receive the reagent through the test tube; a weighing unit located below the cuvette holder and adapted to measure the mass of the reagent when the cuvette holder is supported thereon; the tray is suitable for supporting the test tube seat and driving the test tube seat to lift so as to separate the test tube seat from or support the test tube seat on the weighing unit; the dispensing metering device further comprises a tray driving mechanism which is suitable for driving the tray to lift; the tray driving mechanism comprises a tray motor arranged on the base, a gear in driving connection with the tray motor, a disc cam meshed with the gear, and a support column in sliding connection with the disc cam; the support column is adapted to support the tray; the tray motor is suitable for driving the gear to rotate so as to drive the disc cam to rotate, and therefore the support column is driven to drive the tray to lift when the disc cam rotates.

Optionally, the disc cam includes a cam cylinder disposed along the lifting direction of the tray, and cam teeth and a cam slider disposed on the cam cylinder; the cam teeth are meshed with the gear so as to drive the cam cylinder to rotate through rotation of the gear; the support column comprises a support column body and a support chute arranged on the support column body; the supporting column body is movably arranged on the base along the lifting direction of the tray; the cam sliding bar and the supporting sliding groove are spirally lifted along the lifting direction of the tray and are connected in a sliding manner, so that the supporting sliding groove is suitable for driving the supporting column to lift when the cam sliding bar rotates along with the cam cylinder.

Optionally, one of the support column and the base is provided with a limiting block, and the other is provided with a limiting groove; the limiting groove extends along the lifting direction of the tray, and the limiting block is located in the limiting groove and moves in the limiting groove so as to limit the support column to move only in the lifting direction of the tray.

Optionally, the tray comprises a tray aperture adapted to receive the test tube holder; the test tube seat comprises a tube cavity suitable for fixing a test tube and a flanging extending outwards along the upper edge of the tube cavity; the test tube seat is suitable for being supported on the upper edge of the tray hole through the flanging when being inserted into the tray hole.

Optionally, the test tube seat extends below the bottom of the tray when the test tube seat is supported on the upper edge of the tray hole through the flanging; the tray is adapted to continue to descend relative to the test tube holder when the test tube holder is supported by the weighing unit, such that the upper edge of the tray aperture is separated from the flange, thereby separating the tray from the test tube holder.

Optionally, the flange is folded down over the upper edge of the tray aperture and adapted to contact the inner side wall of the tray.

Optionally, the dispensing metering device further comprises a fixing seat mounted on the weighing unit; the fixing seat comprises a fixing cavity matched with the test tube seat, so that the test tube seat is suitable for receiving and fixing the test tube seat when the test tube seat is supported on the weighing unit.

Optionally, the base comprises a base chamber; the distribution metering device comprises a machine head driving mechanism and a machine head which are respectively arranged inside and outside the base cavity; the handpiece is adapted to mount the dispensing mechanism; the handpiece drive mechanism is coupled to the handpiece and is adapted to drive the handpiece up and down to move the dispensing mechanism away from or towards the test tube.

Optionally, the base chamber is provided with a base chamber opening to allow passage of the handpiece drive mechanism and the connecting portion of the handpiece; the dispensing metering device comprises a retractable curtain adapted to conceal the base chamber opening; the lower end of the telescopic curtain is fixed in the base cavity and is positioned below the opening of the base cavity, and the upper end of the telescopic curtain is connected with the machine head or the machine head driving mechanism so as to be suitable for shielding or opening the opening of the base cavity along with the lifting of the machine head or the machine head driving mechanism.

Optionally, the dispensing metering device further comprises a windshield mounted to the base; the windshield is located below the machine head and is adapted to be lifted to enclose or release the space between the machine head and the weighing cell.

Compared with the prior art, the technical scheme of the embodiment of the invention has the beneficial effects.

For example, by providing a weighing mechanism below the dispensing mechanism, not only can automatic weighing be performed while sampling; moreover, the test tube seat can be driven to lift through the tray, so that the weighing unit only loads the test tube and the test tube seat when weighing is needed, and the test tube seat are not needed to be loaded when weighing is not needed, so that the influence on the service performance of the weighing unit due to long-term load is avoided.

Drawings

FIG. 1 is a schematic view of a dispensing metering device in a non-operating condition according to an embodiment of the present invention;

FIG. 2 is a schematic view of a weighing mechanism according to an embodiment of the invention;

FIG. 3 is another schematic view of a weighing mechanism in accordance with an embodiment of the present invention;

FIG. 4 is a cross-sectional view of the weighing mechanism in a non-operational state according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of the weighing mechanism in an operative state according to an embodiment of the present invention;

FIG. 6 is a partial schematic view of the vertical portions of the handpiece and base in an embodiment of the invention;

FIG. 7 is a cross-sectional view of a dispensing mechanism and a handpiece in an unassembled state, with the reagent delivery mechanism of the dispensing mechanism not shown in the figures, in accordance with an embodiment of the present invention;

FIG. 8 is a partial schematic view of a dispensing metering device in a non-operative condition in accordance with an embodiment of the present invention;

FIG. 9 is a partial schematic view of a dispensing metering device in an operative condition in accordance with an embodiment of the present invention;

fig. 10 is a schematic view of the structure of the dispensing metering device in an operating state in an embodiment of the present invention.

Reference numerals illustrate:

10 dispensing metering device, 100 base, 110 base vertical section, 111 base chamber, 1111 base chamber opening, 112 retractable curtain, 120 base horizontal section, 121 cover, 1211 limit slot, 200 dispensing mechanism, 300 weighing mechanism, 310 weighing cell, 320 tray, 321 tray hole, 330 test tube holder, 331 lumen, 332 flange, 341 tray motor, 342 gear, 343 disc cam, 3431 cam cylinder, 3432 cam tooth, 3433 cam slide, 344 support column, 3441 support cylinder, 3442 support chute, 3443 stopper, 350 fixing seat, 351 fixing cavity, 400 handpiece, 401 handpiece chamber, 410 handpiece drive mechanism, 500 windshield, 600 marble base, 20 test tube.

Description of the embodiments

In order to make the objects, features and advantageous effects of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the following detailed description is merely illustrative of the invention, and not restrictive of the invention. Also, descriptions of the same, similar components in different embodiments, and descriptions of components, features, effects, and the like belonging to the related art may be omitted.

Furthermore, for convenience of description, only some, but not all, structures related to the present invention are shown in the drawings. Moreover, the use of the same, similar reference numbers in different figures may indicate identical, similar elements in different embodiments.

FIG. 1 is a schematic view of a dispensing metering device in a non-operating condition according to an embodiment of the present invention; FIG. 2 is a schematic view of a weighing mechanism according to an embodiment of the invention; FIG. 3 is another schematic view of a weighing mechanism in accordance with an embodiment of the present invention; FIG. 4 is a cross-sectional view of the weighing mechanism in a non-operational state according to an embodiment of the present invention; FIG. 5 is a cross-sectional view of the weighing mechanism in an operative state according to an embodiment of the present invention; FIG. 6 is a partial schematic view of the vertical portions of the handpiece and base in an embodiment of the invention; FIG. 7 is a cross-sectional view of the dispensing mechanism and handpiece in an unassembled state in accordance with an embodiment of the present invention; FIG. 8 is a partial schematic view of a dispensing metering device in a non-operative condition in accordance with an embodiment of the present invention; FIG. 9 is a partial schematic view of a dispensing metering device in an operative condition in accordance with an embodiment of the present invention; fig. 10 is a schematic view of the structure of the dispensing metering device in an operating state in an embodiment of the present invention.

Referring to fig. 1-10, an embodiment of the present invention provides a dispensing metering device 10.

Specifically, the dispensing metering device 10 may include a base 100, and a dispensing mechanism 200 and a weighing mechanism 300 mounted to the base 100. Wherein the dispensing mechanism 200 is adapted to dispense the reagent to be metered; the weighing mechanism 300 is adapted to receive a reagent and to measure the mass of the received reagent.

In some embodiments, the base 100 may have an "L" shaped structure and include a base vertical portion 110 and a base horizontal portion 120 that are connected to each other. Wherein the base vertical portion 110 is adapted to support the dispensing mechanism 200 and the base horizontal portion 120 is adapted to support the weighing mechanism 300.

In particular implementations, the weighing mechanism 300 is positioned below the dispensing mechanism 200 to be adapted to receive the dispensed reagent from the dispensing mechanism 200.

In some embodiments, the dispensing mechanism 200 may be implemented using the solutions disclosed in the application publication CN115541913A, CN115508575A or CN115508574a, which can control the mass flow of the sampled reagent at least by adjusting the speed of movement of the reagent delivery mechanism, e.g. a screw, so as to automatically and accurately sample the reagent, especially the powdered reagent. Also, the dispensing mechanism 200 may also include a container adapted to contain a reagent.

In other embodiments, the dispensing mechanism 200 may also employ any reagent dispensing mechanism known and suitable in the art.

In an embodiment of the present invention, the weighing mechanism 300 may include a weighing cell 310, a tray 320, and a test tube holder 330. Wherein the tube holder 330 is adapted to hold the tube 20 and receive the reagent outputted by the reagent dispensing mechanism 200 through the tube 20; the weighing cell 310 is located below the test tube holder 330 and is adapted to measure the mass of the reagent when the test tube holder 330 is supported thereon (i.e. the weighing cell 310); the tray 320 is adapted to support the test tube holder 330 and to drive the test tube holder 330 up and down to disengage or support the test tube holder 330 from the weighing cell 310.

In some embodiments, the weighing cell 310 may include a high precision balance to weigh reagents with high precision.

By adopting the technical scheme, the weighing mechanism 300 is arranged below the distribution mechanism 200, so that not only can the automatic weighing be performed while sampling; moreover, the test tube holder 330 can be driven to lift by the tray 320, so that the weighing unit 310 only loads the test tube and the test tube holder when weighing is needed, and the test tube holder are not needed when weighing is not needed, so that the influence on the usability of the weighing unit 310 due to long-term load is avoided.

Specifically, when weighing is required, the test tube holder 330 is lowered by the tray 320, so that the test tube holder 330 and the test tube 20 are supported by the weighing unit 310, and the mass of the reagent in the test tube 20 is measured by the weighing unit 310. When weighing is not needed, the test tube holder 330 can be driven by the tray 320 to rise, so that the test tube holder 330 and the test tube 20 rise to be separated from the weighing unit 310, thereby ensuring that the weighing unit 310 does not need to load the test tube and the test tube holder in a non-use state, and avoiding the influence on the usability of the weighing unit 310 due to long-term load.

In particular embodiments, the dispensing metering device 10 further includes a tray drive mechanism adapted to drive the tray 320 up and down.

Referring to fig. 2 and 3, in some embodiments, the tray driving mechanism may include a tray motor 341 mounted to the base 100, a gear 342 drivingly connected to the tray motor 341, a disc cam 343 in meshed driving connection with the gear 342, and a support column 344 slidably connected to the disc cam 343.

In some embodiments, the base horizontal portion 120 is further provided with a cover 121 adapted to receive the weighing cell 310. The cap 121 has an upwardly open opening to allow the test tube holder 330 to be supported from the opening on the weighing cell 310.

The cover 121 is only used to house the weighing cell 310, and there is no contact with the weighing cell 310 and no interaction.

In a specific implementation, both the tray motor 341 and the gear 342 are mounted above the hood 121. And, an output shaft of the tray motor 341 is engaged with the gear 342 to drive the gear 342 to rotate by the tray motor 341.

Further, a disc cam 343 may be installed above the cover 121 and include a cam cylinder 3431 and cam teeth 3432 and cam slides 3433 provided to the cam cylinder 3431. Wherein, cam cylinder 3431 is installed above cover 121, cam teeth 3432 are provided at the lower part of cam cylinder 3431 and engaged with gear 342, and cam slider 3433 is provided at the upper part of cam cylinder 3431 and slidingly connected with support column 344.

In a specific implementation, the tray driving mechanism is adapted to drive the tray 320 to lift in a vertical direction. In this case, the tray motor 341 is adapted to drive the gear 342 to rotate in a horizontal plane, so that the gear 342 drives the cam cylinder 3431 to rotate in a horizontal plane through the cam teeth 3422.

In particular, support column 344 includes a support column 3441 and a support chute 3442 disposed on support column 3441. Wherein the supporting column 3441 is movably installed to the base horizontal part 120 in the lifting direction of the tray 320; the supporting chute 3442 and the cam slider 3433 are both spirally lifted in the lifting direction of the tray 320 and slidably connected so that the supporting chute 3442 is adapted to drive the supporting column 344 to lift when the cam slider 3433 rotates in the horizontal plane along with the cam cylinder 3431, thereby driving the tray 320 to lift through the supporting column 344.

In some embodiments, the cam slider 3433 may be provided with at least two, and the at least two cam sliders 3433 are disposed one above the other. Accordingly, at least two supporting sliding grooves 3442 are provided on the supporting column 3441. Wherein, the supporting chute 3442 and the cam sliding bar 3433 are in one-to-one corresponding sliding connection.

In some embodiments, support columns 344 are mounted to the sides of hood 121 in a vertically movable manner.

Specifically, one of the support column 344 and the side portion of the cover 121 is provided with a stopper 3443, and the other is provided with a stopper groove 1211. For example, a stopper 3443 may be provided on the support column 3441 of the support column 344, and a stopper groove 1211 may be provided on the side of the cap 121. Wherein, the limit groove 1211 extends along the lifting direction of the tray 320, i.e. the vertical direction, and the limit block 3443 is positioned in the limit groove 1211 and can move along the lifting direction of the tray 320, i.e. the vertical direction, in the limit groove 1211. In this way, the support columns 344 can be restricted from moving only in the lifting direction of the tray 320, i.e., in the vertical direction.

In particular implementations, support columns 344 are adapted to support tray 320.

In some embodiments, tray 320 may be directly supported on top of support columns 344.

Specifically, the top ends of the supporting columns 3441 of the supporting columns 344 may have a structure to be matched with the bottom of the tray 320 so as to be suitable for supporting the tray 320.

In some embodiments, the support columns 344 may be uniformly arranged in plurality around the weighing cells 310, for example, four may be uniformly arranged around the weighing cells 310 to stably support the tray 320 by the plurality of support columns 344.

By adopting the technical scheme, the gear 342 can be driven by the tray motor 341 to rotate in the horizontal plane, so that the disc cam 343 is driven to rotate in the horizontal plane, and the support column 344 is driven by the disc cam 343 rotating in the horizontal plane to drive the tray 320 to lift.

In some embodiments, tray 320 may include a tray aperture 321 adapted to receive test tube holder 330.

Accordingly, the tube holder 330 includes a lumen 331 and a flange 332 extending outwardly along an upper edge of the lumen 331. Wherein the bottom of lumen 331 is closed and adapted for securing cuvette 20; the test tube holder 330 is adapted to be supported on the upper edge of the tray hole 321 by the flange 332 when it is inserted into the tray hole 321.

In some embodiments, the flange 332 of the test tube holder 330 is folded down over the upper edge of the tray aperture 321 and is adapted to contact the inner sidewall of the tray 320. Thus, the tube holder 330 and the tray 320 can be positioned and connected by the flange 332, so as to prevent shaking between the tube holder 330 and the tray 320.

As previously described, the tray 320 is adapted to support the test tube holder 330 and to move the test tube holder 330 up and down to disengage or support the test tube holder 330 from the weighing cell 310.

In particular embodiments, the tube holder 330 extends below the bottom of the tray 320 when it is supported by the flange 332 at the upper edge of the tray aperture 321. In this way, the tray 320 can be further lowered relative to the test tube holder 330 when the test tube holder 330 is supported by the weighing unit 310, so that the upper edge of the tray hole 321 is separated from the flange 332 of the test tube holder 330, and the tray 320 is separated from the test tube holder 330, so as to avoid the impact of the contact between the tray 320 and the test tube holder 330 on the weighing of the weighing unit 310.

Referring to fig. 4 and 5, in the non-operating state, the tray 320 is adapted to support the test tube holder 330 and disengage the test tube holder 330 from the weighing cell 310. When the operation state is entered, the tray 320 is driven to start descending by the tray driving mechanism; since the test tube holder 330 is separated from the weighing cell 310 and supported by the tray 320, the test tube holder 330 also starts to descend when the tray 320 descends; when the test tube holder 330 descends to contact with the weighing unit 310 (i.e. when supported by the weighing unit 310), the tray 320 can descend relative to the test tube holder 330, so that the upper edge of the tray hole 321 is separated from the flange 332 of the test tube holder 330, and the tray 320 is separated from the test tube holder 330; when the tray 320 is separated from the tube holder 330, only the tube holder 330 and the tube 20 fixed to the tube holder 330 are supported by the weighing unit 310, and at this time, the tube holder 330, the tube 20 fixed to the tube holder 330 and the reagent located in the tube 20 can be weighed by the weighing unit 310.

After the weighing is completed, the tray 320 is driven to rise by the tray driving mechanism, and when the tray 320 rises to the upper edge of the tray hole 321 and abuts against the flange 332 of the test tube holder 330, the test tube holder 330 and the test tube 20 fixed on the test tube holder 330 can be driven to rise synchronously, so that the test tube holder 330 is separated from the weighing unit 310. Thus, the weighing cell 310 can be made unnecessary to load the test tube 20 and the test tube holder 330 when not in use, thereby avoiding the influence of the long-term load on the use performance of the weighing cell 310.

With continued reference to fig. 3-5, in some embodiments, the dispensing metering device 10 may further include a mount 350 mounted to the weighing cell 310. In particular, the holder 350 may include a fixing cavity 351 that cooperates with the test tube holder 330 to receive and fix the test tube holder 330 when the test tube holder 330 is supported by the weighing cell 310.

In some embodiments, the fixing cavity 351 may have a structure to be matched with an outer bottom of the test tube holder 330 to ensure that the test tube holder 330 can be stably supported to the weighing cell 310 in a vertical direction.

In this way, stability of the test tube holder 330 during weighing can be ensured, thereby ensuring accuracy and precision of reagent weighing.

It should be noted that, in the embodiment of the present invention, the mass actually measured by the weighing unit 310 includes the mass of the test tube holder 330, the mass of the test tube 20, and the mass of the reagent in the test tube 20.

In practice, in order to obtain the mass of the reagent in test tube 20, it is necessary to subtract the mass of test tube holder 330 and test tube 20 from the mass measured by weighing cell 310, or to perform a zeroing operation to remove the mass of test tube holder 330 and test tube 20 before weighing.

In particular implementations, the output end of dispensing mechanism 200 is aligned up and down the mouth of test tube 20 to facilitate entry of reagent output by dispensing mechanism 200 into test tube 20.

Further, the dispensing mechanism 200 may also be vertically lifted to descend to be close to the test tube 20 for outputting the reagent into the test tube 20 when weighing and sampling, and lifted to be away from the reagent 20 for taking the test tube 20 when weighing is completed.

In some embodiments, the base vertical portion 110 may include a base chamber 111. Accordingly, the dispensing metering device 10 may also include a handpiece drive mechanism 410 and a handpiece 400 disposed within and outside of the base chamber 111, respectively. Wherein the handpiece 400 is located outside the base chamber 111 and is adapted to mount the dispensing mechanism 200; a handpiece drive mechanism 410 is located within the base chamber 111 and is coupled to the handpiece 400 and is adapted to drive the handpiece 400 up and down to move the dispensing mechanism 200 away from or towards the cuvette 20.

In implementations, the dispensing mechanism 200 may be mounted within the handpiece 400.

In some embodiments, the handpiece 400 can include a handpiece chamber 401 to receive the dispensing mechanism 200. The dispensing mechanism 200 is adapted to be received within the handpiece chamber 401 and has two ends fixedly connected to the handpiece chamber 401, respectively.

In some embodiments, a threaded or snap-fit connection may be employed between the dispensing mechanism 200 and the handpiece chamber 401.

In particular implementations, the dispensing mechanism 200 is adapted to output a reagent through its bottom or lower end. Accordingly, the handpiece chamber 401 is adapted to be disposed diagonally downward. In this manner, the dispensing mechanism 200 can be mounted diagonally downward to the handpiece 400, thereby facilitating the dispensing mechanism 200 to output the reagent.

In particular implementations, the handpiece chamber 401 has a lower outlet adapted to output reagents. The dispensing mechanism 200 has an output end (bottom or lower end thereof) that is positioned to correspond to the lower outlet of the handpiece chamber 401 to facilitate the output of reagent through the lower outlet of the handpiece chamber 401.

In implementations, the handpiece 400 can also include a handpiece outlet disposed corresponding to a lower outlet of the handpiece chamber 401 to allow the reagent output by the dispensing mechanism 200 to exit the handpiece 400.

In some embodiments, the handpiece drive mechanism 410 may include a handpiece motor, a lead screw coupled to the handpiece motor, and a lead screw nut drivingly coupled to the lead screw. Wherein the lead screw nut is fixedly connected with the handpiece 400.

In a specific implementation, the handpiece motor drives the screw to rotate, and the screw rotation drives the screw nut to drive the handpiece 400 to ascend or descend.

In other embodiments, handpiece drive mechanism 410 can be implemented using any conventional means known and suitable in the art.

In particular implementations, the base chamber 111 is provided with a base chamber opening 1111 to allow the coupling portion of the handpiece drive mechanism 410 and the handpiece 400 to pass through.

Referring to fig. 8 and 9, in some embodiments, the dispensing metering device 10 may further include a retractable curtain 112 adapted to conceal the base chamber opening 1111.

Specifically, the lower end of the retractable curtain 112 may be fixed in the base chamber 111 and below the base chamber opening 1111, and the upper end thereof is connected to the head 400 or the head driving mechanism 410 so as to be adapted to cover or uncover the base chamber opening 1111 as the head 400 or the head driving mechanism 410 is lifted or lowered.

In this manner, the base chamber opening 1111 may be shielded by the retractable curtain 112 in the inactive state to prevent dust or debris from entering the base chamber 111 through the base chamber opening 1111.

Referring to fig. 9 and 10, the dispensing metering device 10 may further include a windshield 500 mounted to the base 100. The draft shield 500 is located below the head 400 and is adapted to be lifted to enclose or un-enclose a space between the head 400 and the weighing cell 310.

In particular embodiments, the dispensing metering device 10 further includes a windshield drive mechanism mounted to the base 100 to drive the windshield 500 up and down. The windshield drive mechanism may be implemented using any conventional means known and suitable in the art, and is not limited herein.

In particular, when sampling and weighing are required, firstly, the tray 320 is driven by the tray driving mechanism to drive the test tube holder 330 to descend so that the test tube holder 330 is supported on the weighing unit 310, and the weighing unit 310 is convenient for weighing the reagent in the test tube 20; then, the machine head 400 is driven by the machine head driving mechanism 410 to drive the dispensing mechanism 200 to descend so that the output end of the dispensing mechanism 200 approaches the test tube 20 and the test tube 20 is convenient for receiving the reagent output by the dispensing mechanism 200; then, the windshield 500 is driven to rise by the windshield driving mechanism to surround the space between the machine head 400 and the weighing unit 310, so as to prevent the surrounding air flow from influencing the sampling and weighing process; finally, the reagent is dispensed into the test tube 20 by the dispensing mechanism 200, and the reagent of the test tube 20 is weighed by the weighing unit 310.

When the sampling and weighing are completed, the windshield 500 is driven to descend by the windshield driving mechanism to release the above-mentioned enclosure, the tray 320 is driven by the tray driving mechanism to drive the test tube holder 330 to ascend so as to separate the test tube holder 330 from the weighing unit 310, and the machine head 400 is driven by the machine head driving mechanism 410 to drive the dispensing mechanism 200 to ascend, so that the whole dispensing and weighing device 10 is restored to the original state.

It should be noted that the above description is merely an exemplary description of the process of weighing and sampling and the process of recovering the initial state of the dispensing meter 10 after the weighing and sampling are completed, and is not a limitation on the execution sequence of the steps involved in these processes.

In some embodiments, the dispensing metering device 10 may further include a marble base 600 disposed under the weighing cell 310 to reduce vibration that may occur during the sampling and weighing process, thereby ensuring the stability and accuracy of the sampling and weighing.

In an implementation, the marble base 600 may be disposed under the base horizontal portion 120.

Although specific embodiments of the invention have been described above, these embodiments are not intended to limit the scope of the disclosure, even where only a single embodiment is described with respect to a particular feature. The characteristic examples provided in the present disclosure are intended to be illustrative, not limiting, unless stated differently. In practice, the technical features of one or more dependent claims may be combined with the technical features of the independent claims in any appropriate manner and not merely in the specific combinations enumerated in the claims, where technically possible, depending on the actual requirements.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. A dispensing metering device (10), characterized by comprising:

a base (100);

a dispensing mechanism (200) mounted to the base (100) and adapted to dispense an output of a reagent to be metered;

-a weighing mechanism (300) located below the dispensing mechanism (200) and comprising:

a test tube holder (330) adapted to fix a test tube (20) and to receive said reagent through said test tube (20);

a weighing unit (310) located below the test tube holder (330) and adapted to measure the mass of the reagent when the test tube holder (330) is supported thereon;

a tray (320) adapted to support the test tube holder (330) and to drive the test tube holder (330) up and down so as to disengage the test tube holder (330) or to be supported on the weighing unit (310);

the dispensing metering device (10) further comprises a tray driving mechanism adapted to drive the tray (320) up and down; the tray driving mechanism comprises a tray motor (341) mounted on the base (100), a gear (342) in driving connection with the tray motor (341), a disc cam (343) meshed with the gear (342), and a support column (344) in sliding connection with the disc cam (343); the support column (344) is adapted to support the tray (320); the tray motor (341) is suitable for driving the gear (342) to rotate so as to drive the disc cam (343) to rotate, and therefore the support column (344) is driven to drive the tray (320) to lift when the disc cam (343) rotates.

2. The dispensing metering device (10) of claim 1 wherein the disc cam (343) comprises a cam cylinder (3431) disposed in a lifting direction of the tray (320), and cam teeth (3432) and cam slides (3433) disposed on the cam cylinder (3431); the cam teeth (3432) are meshed with the gear (342) so as to drive the cam cylinder (3431) to rotate through the rotation of the gear (342); the support column (344) comprises a support column body (3441) and a support chute (3442) arranged on the support column body (3441); the supporting column (3441) is movably mounted on the base (100) along the lifting direction of the tray (320); the cam sliding bar (3433) and the supporting sliding groove (3442) are spirally lifted along the lifting direction of the tray (320) and are connected in a sliding manner, so that the supporting sliding groove (3442) is suitable for driving the supporting column (344) to lift when the cam sliding bar (3433) rotates along with the cam cylinder (3431).

3. The dispensing metering device (10) of claim 2 wherein one of said support column (344) and said base (100) is provided with a stopper (3443) and the other is provided with a stopper slot (1211); the limit groove (1211) extends in the lifting direction of the tray (320), and the limit block (3443) is located in the limit groove (1211) and moves in the limit groove (1211) to limit the support column (344) to move only in the lifting direction of the tray (320).

4. The dispensing metering device (10) of claim 1 wherein the tray (320) includes a tray aperture (321) adapted to receive the test tube holder (330); the tube holder (330) comprises a tube cavity (331) suitable for fixing the tube (20), and a flange (332) extending outwards along the upper edge of the tube cavity (331); the test tube holder (330) is adapted to be supported by the flange (332) at the upper edge of the tray hole (321) when inserted into the tray hole (321).

5. The dispensing metering device (10) of claim 4 wherein said tube holder (330) extends below the bottom of said tray (320) when it is supported by said flange (332) at the upper edge of said tray aperture (321); the tray (320) is adapted to continue to descend relative to the tube holder (330) when the tube holder (330) is supported by the weighing unit (310) such that the upper edge of the tray aperture (321) is separated from the flange (332), thereby separating the tray (320) from the tube holder (330).

6. The dispensing metering device (10) of claim 4 wherein said flange (332) is folded down over an upper edge of said tray aperture (321) and adapted to contact an inside wall of said tray (320).

7. The dispensing metering device (10) of claim 4 wherein the dispensing metering device (10) further comprises a mounting (350) mounted to the weighing cell (310); the holder (350) comprises a fixing cavity (351) cooperating with the test tube holder (330) for receiving and fixing the test tube holder (330) when the test tube holder (330) is supported by the weighing unit (310).

8. The dispensing metering device (10) of claim 1 wherein the base (100) comprises a base chamber (111); the dispensing and metering device (10) comprises a machine head driving mechanism (410) and a machine head (400) which are respectively arranged inside and outside the base chamber (111); -said handpiece (400) is adapted to mount said dispensing mechanism (200); the handpiece drive mechanism (410) is coupled to the handpiece (400) and is adapted to drive the handpiece (400) up and down to move the dispensing mechanism (200) away from or towards the test tube (20).

9. The dispensing metering device (10) of claim 8 wherein the base chamber (111) is provided with a base chamber opening (1111) to allow passage of the connection portion of the handpiece drive mechanism (410) and the handpiece (400); the dispensing metering device (10) comprises a retractable curtain (112) adapted to conceal the base chamber opening (1111); the lower end of the telescopic curtain (112) is fixed in the base chamber (111) and is positioned below the base chamber opening (1111), and the upper end of the telescopic curtain is connected with the handpiece (400) or the handpiece driving mechanism (410) so as to be suitable for shielding or opening the base chamber opening (1111) along with the lifting of the handpiece (400) or the handpiece driving mechanism (410).

10. The dispensing metering device (10) of claim 8 wherein the dispensing metering device (10) further comprises a windshield (500) mounted to the base (100); the windshield (500) is located below the hand piece (400) and is adapted to be lifted to enclose a space between the hand piece (400) and the weighing cell (310) or to release the enclosure.