TW201432225A - Liquid measurement device - Google Patents

Abstract

The present invention provides a liquid measurement device for measuring the required liquid, such as dye, which comprises a movable wheel, several measuring units, and an actuation unit. In which, the measuring units are configured at the movable wheel, and the measuring unit comprises a container, an injector, a needle and a multi-pass valve. The actuation unit may be corresponded to the measuring units. The actuation unit comprises a first actuation unit and a second actuation unit. The actuation unit may drive the injector for extraction of the liquid in the container and for injecting the liquid into a receiving container on top of a weighing apparatus. The present invention may achieve the purpose for precise control of liquid measurement, and may utilize the rotation of moveable wheel to disturb the liquid in the container for achieving more uniform stirring effect.

Description

Liquid metering device

The invention relates to a liquid metering device, in particular to a liquid metering device for dyeing liquid metering control and stirring.

At present, in the chemical industry, such as the food industry, the pharmaceutical industry, and the textile dyeing industry, liquid chemicals are often used. These chemicals need to be in accordance with the set proportions to achieve the target effect of chemical reactions, especially in the case of micro-precision metering. The correct measurement has always been a topic of great concern to the industry.

In the existing liquid metering device, the syringe and the liquid storage bottle are separated structures, such as the treatment method of Taiwan Utility Model Patent Publication No. 392862, which inserts the syringe into the storage bottle and sucks the liquid in the storage bottle (the siphon principle), The syringe is taken out of the storage bottle, and then the liquid in the syringe is injected into the designated container. This process requires multiple steps, and the liquid in the syringe cannot be injected into the destination container immediately after the liquid is quickly extracted by the syringe, so the measurement process is performed. The accuracy is low and the efficiency is not high, and the separate process is depleted for the micro-liquid metering process.

In addition, in order to avoid the precipitation of liquid (such as colorant) in the bottle, the conventional method is to place a magnet in the storage bottle, and the external positive and negative parts are used to drive the magnetic positive and negative poles to apply magnetic rotation to the magnet in the storage bottle, so that The magnets generate an appropriate agitation action on the internal liquid to avoid the problem of uneven liquid precipitation in the storage bottle.

However, with the magnet as a stirring process, although the purpose of moderately disturbing the liquid can be obtained, each of the storage bottles requires a magnetic positive and negative rotating device, which increases the device cost. Moreover, with the stirring of the bottom of the bottle magnet, the stirring effect is still limited, and the stirring too fast will also destroy the liquid.

Therefore, the existing liquid metering and agitation processing technology has not yet been ideal, so the inventor has continuously researched and improved the concept of innovation based on products, and actively researched and thought through the practical experience of the product development for many years, through numerous practical designs. Experiments have led to the production of the present invention.

It is an object of the present invention to provide a liquid metering device that integrates storage and more precisely controls the flow of liquid into the receiving container.

Another object of the present invention is to provide a liquid metering device capable of imparting a uniform effect of liquid agitation in a container.

The above liquids are often used in the examples for the dyeing of cloth.

For the purpose of the present invention, the structure of the present invention comprises a movable wheel, a plurality of metering units, and a tilting unit, wherein the movable wheel comprises a wheel body, a central shaft portion and a plurality of receiving grooves arranged in the wheel body; The metering unit comprises: a container combined with the receiving tank, the container is filled with a predetermined liquid; a syringe comprising a movable plug rod; a needle tube; a multi-way valve comprising a sphere and a plurality of tubes And a handle, the pipes are connected to each other, and one end of one of the pipes communicates with the container, wherein one end of the pipe communicates with the syringe and one of the pipes is connected to the needle at one end, and the ball includes a connecting channel, and the ball is located at the same In the center of the valve, the handle is inserted into the multi-way valve from the outside to the inside to contact and touch the ball Steering, when the handle is used to touch the direction of the connecting passage of the ball inside the multi-way valve, the two pipes of the pipes are connected to each other.

The swaying unit includes a first swaying group in a horizontal direction and a second swaying group in a vertical direction with respect to the first swaying group, the first swaying group includes a first power source and a first screw a first clamping portion, the first power source is connected to the first screw, and drives the first screw to move, the first screw side is connected to the first clamping portion, and the first clamping portion is sleeved to the multi-way valve The first power source drives the first screw forward to push the multi-way valve to the first clamping portion, and the first power source drives the first screw to pull the measuring unit and the container to correspond to Above the receiving container and weighing device (see Figures 6 to 8). Further, the first power source can further drive the first screw to push the first clamping portion for stimulating the handle to rotate the ball to rotate inside the multi-way valve to change the T-shaped pipe communication position of the ball, for example, to communicate with the container. Feed port and syringe or connect needle and syringe.

The second turbulent group further includes a second power source, a second screw, and a second clamping portion. The second power source is connected to the second screw and drives the second screw to move. a second clamping portion, wherein the second clamping portion is sleeved on the movable plug rod of the syringe while the first clamping portion is sleeved on the multi-way valve, whereby the second power source can drive the second clamping portion Moving the movable plug rod of the syringe to pull up or push the movable plug rod to move up and down in the syringe to inject or suck liquid in the container into the syringe, thereby achieving precise control of liquid metering, and additionally utilizing a movable wheel The rotation is used to disturb the liquid in the container to achieve a more even function of agitation.

The technical solution of the present invention is: a liquid metering device, comprising: a movable wheel, the movable wheel comprises a wheel body and a central shaft portion And a plurality of accommodating grooves are arranged in a ring shape in the wheel body, the movable wheel is driven to rotate; at least one metering unit is disposed in each of the accommodating grooves, the metering unit comprises: a container, combined in the a receiving tank, the container is filled with a predetermined liquid; a syringe comprising a movable plug rod; a needle tube; a multi-way valve, the multi-way valve comprising a first pipe, a second pipe, a third pipe, and a a ball, a handle, the ball includes a connecting passage, the ball is disposed in the middle of the multi-way valve, the handle is inserted into the multi-way valve from the outside to the inside and can be steered by the ball, and the first pipe is connected to the container at one end. One end of the second pipe communicates with the syringe, the third pipe communicates with the needle tube; and a tilting unit includes a first tilting group in a horizontal direction and a second vertical direction in a vertical direction with respect to the first tilting group a first driving group, a first power source, a first screw, and a first clamping portion, the first power source is connected to the first screw, and the first screw side is connected to the first The first clamping portion is for clamping on the multi-way valve; the second swaying group includes a second power source, a second screw, and a second clamping portion, and the second power source is connected to the second screw. The second screw side is connected to the second clamping portion, and the second clamping portion is used for clamping the movable plug rod of the syringe.

As described above, the connecting passage of the sphere is a T-shaped passage.

As described above, the first clamping portion is further drivable by the first power source to push the handle to touch the ball to steer inside the multi-way valve, and when the T-shaped passage connects the second conduit to the syringe while communicating with the first conduit To the discharge port of the container, the third pipe is not connected to the needle tube; otherwise, when the T-shaped channel connects the second pipe to the injection The device simultaneously communicates the third pipe to the needle tube, and the first pipe does not communicate with the discharge port of the container.

As described above, the support base further includes a support body including a body and a support frame, the support frame is erected on the body, and the movable wheel is axially disposed on the top of the support frame by the central shaft portion. And rotating the movable wheel on the support frame.

As described above, the device further includes a mounting bracket defining a movable wheel region for mounting a movable wheel, the movable wheel region having two parallel corresponding guide rails, and the support base has a corresponding lower portion The guide seat of the guide rail guides the guide seat to the guide rail for the movable wheel to move along the path of the guide rail.

As described above, the power unit is further disposed on one side of the support base for driving the support base and the movable wheel to move along the path of the guide rail.

As described above, a transmission unit is further included, the transmission unit includes a motor and a belt, the motor has a spindle, and the motor is disposed on the body of the support base, and the belt sleeve is disposed on the spindle of the motor And between the central shaft portion of the movable wheel, the motor drives the movable wheel to rotate.

As described above, the invention further comprises a weighing device, a receiving container, the receiving container is placed on the weighing device, the receiving container is configured to receive the metered liquid, and the receiving container and the weighing device are correspondingly disposed on the movable wheel. Below the side.

As described above, a control unit is also included, which controls the movement of the swaying unit, the first and second power sources, and the motor.

As mentioned above, a control unit is also included, which is connected to the weighing device, which provides information of the liquid weighing process to the control unit.

The liquid metering device of the present invention uses the wheel of the Ferris wheel to rotate on the support frame, so that the liquid of the container can be used for 360 degrees and the impact in the front-rear direction to make the mixing of the liquid more uniform. In addition, the valve control connection or isolation of the multi-way valve is utilized, and the injector, the weighing device, and the like are matched by the swaying unit to precisely control the discharge amount of the liquid.

10‧‧‧Installation rack

11‧‧‧ activity wheel

111‧‧‧rail

12‧‧‧掣动区区

121‧‧‧rails

20‧‧‧ activity round

21‧‧‧ Wheel body

22‧‧‧Center shaft

23‧‧‧ accommodating slots

30‧‧‧ support

31‧‧‧Ontology

32‧‧‧Support frame

33‧‧‧ lead seat

40‧‧‧Power unit

50‧‧‧Metric unit

51‧‧‧ Container

511‧‧‧Outlet

52‧‧‧Syringe

521‧‧‧ movable stopper

53‧‧‧ needle

54‧‧‧Multiple valve

5411‧‧‧First pipeline

5412‧‧‧Second pipeline

5413‧‧‧ Third Pipe

5414‧‧‧Handle

542‧‧‧ sphere

5421‧‧‧Connection channel

60‧‧‧掣动单元

61‧‧‧The first instigation group

611‧‧‧First power source

612‧‧‧First screw

613‧‧‧First clip

62‧‧‧Second Incident Group

621‧‧‧second power source

622‧‧‧Second screw

623‧‧‧Second clip

70‧‧‧Transmission unit

71‧‧‧Motor

711‧‧‧ mandrel

72‧‧‧ belt

80‧‧‧Weighing device

81‧‧‧With container

Figure 1 is a perspective view of the present invention.

Figure 2 is a side view of the present invention.

Figure 3 is a top view of the present invention.

Fig. 4 is a perspective view of the movable wheel and the tilting unit of the present invention, showing the movable wheel being instructed to rotate to the row of measuring units to be metered.

FIG. 5 is another perspective view of the movable wheel and the swaying unit of the present invention. The figure shows that the measuring unit that is to be metered after the moving wheel moves corresponds to the swaying unit.

Figure 6 is a schematic view of the metering work of the present invention, and the positioning diagram of the movable wheel and the tilting unit in the figure.

Figure 7 is a schematic view of the metering operation of the present invention, wherein the swaying unit moves toward the metering unit, and the multi-way valve and the syringe are held by the second swaying group.

Figure 8 is a schematic view of the metering work of the present invention, wherein the tilting unit self-lives the container Pull out in the moving wheel.

Figure 9 is a schematic illustration of the metering operation of the present invention in which the steering of the ball is controlled to the feeding orientation and the second jaw is moved upward to draw the liquid inside the container for injection into the syringe. Figure 10 is a schematic illustration of the metering operation of the present invention in which the steering of the ball is controlled to the discharge orientation and the second jaw is moved downwardly to allow the liquid drawn from the syringe to drip out to the receiving container.

The liquid metering device of the invention is used in, for example, the food industry, the pharmaceutical industry, the textile dyeing industry, and the chemical industry to provide liquid material for precise metering control.

Referring to FIG. 1 , FIG. 2 , FIG. 3 and FIG. 5 , the liquid metering device of the present invention comprises: a mounting frame 10 , a movable wheel 20 , a support base 30 , and a support unit 30 . a power unit 40, a plurality of metering units 50, a tilting unit 60, and a transmission unit 70. The movable wheel 20 is rotatably coupled to the support base 30. The power unit 40 is coupled to the support base 30 and interlocks the activity. The wheel 20 is coupled to the mounting frame 10, and the plurality of metering units 50 are movably coupled to the movable wheel 20, and the plurality of metering units 50 are respectively loaded with different standard concentrations. The liquid measuring device of the present invention may further comprise a control unit (not shown), the control unit such as a computer, a control circuit or the like electrically connecting the power components of the liquid metering device of the present invention, and the control unit sends a signal to the transmission. The unit 70 drives the movable wheel 20 to rotate, and the metering unit 50 loaded by the control unit and loaded with a certain standard concentration liquid container is rotated to the side of the corresponding tilting unit 60.

Please refer to FIG. 6 at the same time, the liquid metering device of the present invention further includes a scale The weighting device 80 and the receiving container 81 are placed on the weighing device 80. The receiving container 81 and the weighing device 80 are disposed near the lower side of the movable wheel 20, and the measuring unit 50 is rotated by the command. At the same time, corresponding to a predetermined receiving container 81 and the weighing device 80, the control unit instructs the tilting unit 60 to operate the metering unit 50 to perform a pumping action on the standard concentration liquid container to inject a standard concentration liquid. In the receiving container 81, the weighing device 80 provides information on the liquid weighing process and can be electrically connected to provide information to the control unit to monitor and command the operation of each metering unit 50 to completion, the movable wheel 20 of the present invention. At the same time, the standard concentration liquid in the container of the metering unit 50 can be rotated to evenly stir.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , the mounting frame 10 can be composed of aluminum extrusion materials overlapping each other, and defines a movable wheel region 11 and a tilting unit region 12 for separately installed. The movable wheel 20, the swaying unit 60, and a movable wheel section 11 have two parallel-corresponding guide rails 111 for the movable wheel 20 to move thereon.

Referring to FIGS. 2 , 4 , and 5 , the movable wheel 20 includes a wheel body 21 , a center shaft portion 22 , and a plurality of receiving grooves 23 arranged in the wheel body 21 .

The support base 30 includes a main body 31 and a support frame 32. The support frame 32 is erected on the main body 31. The movable wheel 20 is axially disposed on the top end of the support frame 32 by the central shaft portion 22, and The movable wheel 20 rotates on the support frame 32.

A guide seat 33 corresponding to the guide rail 111 is further disposed under the body 31, and the guide seat 33 is guided to the guide rail 111 for moving the movable wheel 20 according to the path of the guide rail 111, such as when a certain one is needed. When the liquid is at a standard concentration, the movable wheel 20 is rotated to a container of the measuring unit 50 commanded by a control unit such as a computer (not shown). In the position of the row of accommodating slots 23, the movable wheel 20 is moved to the left and right to find the container in which the locating slot 23 is searched for, that is, the corresponding bearing unit 60 and the swaying unit 60 can be correspondingly received. Above the container 81 and the weighing device 80, a liquid injecting container and a measuring step are performed.

Referring to FIG. 2 , FIG. 3 and FIG. 5 , the power unit 40 is disposed on one side of the support base 30 for driving the movable wheel 20 to move along the path of the guide rail 111 .

Referring to FIG. 2 and FIG. 6 to FIG. 9 , the metering unit 50 includes a container 51 , a syringe 52 , a needle tube 53 and a multi-way valve 54 .

The container 51 is incorporated in the accommodating groove 23, and the inside of the container 51 is filled with a predetermined liquid (such as a coloring matter, a food, a chemical, a medicine, etc.), and in the present embodiment, it is applied to a dyeing color such as cloth. The container 51 is in communication with the multi-way valve 54 for discharging to the multi-way valve 54.

The syringe 52 includes a movable plunger 521.

The multi-way valve 54 includes a ball 542, a plurality of first pipes 5411, a second pipe 5412 and a third pipe 5413 and a handle 5414; wherein the first pipe 5411 is connected at one end to the discharge port 511 of the container 51. One end of the second pipe 5412 communicates with the syringe 52 and one end of the third pipe 5413 is connected to the needle tube 53 of the drop container; and the ball 542 includes a connecting channel 5421, which is a T-shaped connecting channel in this embodiment. The ball 542 is located in the middle of the multi-way valve 54. The side of the handle 5414 can be touched by the multi-way valve 54 to the outside of the multi-way valve 54. The other side of the handle 5414 protrudes outside the multi-way valve 54 for receiving Manipulating the multi-way valve 54 that touches the ball 542 to turn, when the T-shaped second conduit 5412 communicates with the syringe 52 while communicating the first tube The passage 5411 to the discharge port 511 of the container 51, the third conduit 5413 is not connected to the needle tube 53; conversely, when the T-shaped second conduit 5412 communicates with the syringe 52 while communicating the third conduit 5413 to the needle tube 53, the first A pipe 5411 is not connected to the discharge port 511 of the container 51.

Referring to FIGS. 1 to 10, the tilting unit 60 is disposed in the tilting unit area 12 of the mounting frame 10, and can be driven by the control unit to be mounted toward the movable wheel 20. The container 51 of the concentration liquid moves.

The swaying unit 60 includes a first swaying group 61 in a horizontal direction and a second swaying group 62 in a vertical direction with respect to the first swaying group 61. The first swaying group 61 includes a first power source. 611, a first screw 612, a first clamping portion 613, the first power source 611 is connected to the first screw 612, and drives the first screw 612 to move, the first screw 612 side is connected to the first clamping portion 613, The first clamping portion 613 can be sleeved on the multi-way valve 54 , whereby the first power source 611 drives the first screw 612 to push the first clamping portion 613 to sandwich the multi-way valve 54 , the first power source 611 The first screw 612 is driven to pull the metering unit 50 and the container 51 to correspond to the receiving container 81 and the weighing device 80 (see FIGS. 6 to 8). Further, the first power source 611 can drive the first screw 612 to push the first clamping portion 613 for urging the handle 5414 to rotate the ball 542 to rotate inside the multi-way valve 54 to change the T-shaped pipe connection position of the ball 542. For example, the discharge port 511 of the communication container 51 is connected to the syringe 52 or the communication needle tube 53 and the syringe 52.

The second turbulence group 62 further includes a second power source 621, a second screw 622, and a second clamping portion 623. The second power source 621 is coupled to the second screw 622 and drives the second screw 622 to move. The second clamping portion 623 is connected to the second clamping portion 623. When the first clamping portion 613 is sleeved on the multi-way valve 54, the second clamping portion 623 is The sleeve is clamped to the movable stopper rod 521 of the syringe 52, whereby the second power source 621 can drive the second clamping portion 623 to move the movable stopper rod 521 of the syringe 52 for pulling up or pushing the movable stopper rod 521 at The syringe 52 is moved up and down to inject or suck the liquid in the container 51 into the syringe 52 (see Fig. 9 and Fig. 10).

The first power source 611 or the second power source 621 may be applied to the present invention in any of the embodiments, such as a motor, a hydraulic power unit, a pneumatic power unit, and the like.

Referring to FIGS. 3 and 5, the transmission unit 70 includes a motor 71 and a belt 72. The motor 71 has a spindle 711 that is disposed on the body 31 of the support base 30. The belt 72 is fixed between a mandrel 711 of the motor 71 and a central shaft portion 22 of the movable wheel 20. The belt 72 is used to transmit the power of the motor 71 to drive the movable wheel 20.

The movable wheel 20 is axially disposed on the top end of the support frame 32 by the central shaft portion 22, and the movable wheel 20 is rotated on the support frame 32. The receiving container 81 is disposed under the movable wheel 20, corresponding to the tilting unit. The lower side of the 60 position receives the container 81 for receiving the liquid precisely spit by the metering unit 50.

Referring to FIGS. 4 and 5, the motor 71 is activated to drive the movable wheel 20 to rotate by the transmission of the belt 72. The liquid filled in the container 51 is loaded with the rotational movement of the movable wheel 20. By the front and rear impact type stirring generated by the rotation 51 of the movable wheel 20, the optimal stirring effect can be obtained, and the liquid (pigment) is more uniformly mixed.

Please refer to Figure 6, Figure 7, Figure 8, Figure 9, Figure 10, this The metering unit 50 of the invention has a metering output of liquid: when a certain metering unit 50 on the movable wheel 20 is driven to rotate above the receiving container 81 by the recipe information of the control unit, the needle tube 30 corresponds to the receiving container 81, whereby the first power source 611 drives the first screw 612 to push the first clamping portion 613 to sandwich the multi-way valve 54 by the swaying of the swaying unit 60. The power source 611 drives the first screw 612 to pull the metering unit 50 and the container 51 to correspond to the receiving container 81 and the weighing device 80 (see FIGS. 6 to 8). While the first clamping portion 613 is clamping the multi-way valve 54, the ball 542 is inside the multi-way valve 54 and communicates with the first pipe 5411 of the discharge port 511 of the container 51 through the T-shaped connecting passage 5421. The second conduit 5412 of the syringe 52, the second power source 621 can drive the second clamping portion 623 to lift the movable plunger 521 of the syringe 52 for sucking the liquid in the container 51 temporarily in the syringe 52 (please refer to Figure 9 and Figure 10).

Further, the first power source 611 drives the first screw 612 to push the first clamping portion 613 forward to shake the handle 5414 to touch the ball 542 to turn inside the multi-way valve 54 to change the T-shaped connecting channel of the ball 542. The communicating position of the 5421 is connected to the third pipe 5413 of the needle tube 53 and the second pipe 5412 of the syringe 52 to the discharge direction, that is, the connecting channel 5421 of the ball 542 respectively corresponds to the second pipe 5412 and the third pipe respectively. The pipe 5413, at this time, the second power source 621 is controlled to drive the second screw 622 to push the second clamping portion 623 to push down the movable plug rod 521 to move downward in the syringe 52, so that the drawn liquid flows. The second pipe 5412 and the third pipe 5413 are discharged from the needle tube 530 into the receiving container 81, and the weighing device 80 displays the weight and completes the metering of the liquid.

When it is known by the weighing device 80 that the liquid in the receiving container 81 has not reached the required liquid amount, the second clamping portion 623 can be controlled by the control unit to push the movable plunger 521 of the syringe 52 to re-inject the liquid into the container 81. Internally, until the weighing device 80 displays the liquid weight to the required amount of liquid.

In addition, in addition to the squeezing unit 60 to which the present invention can be applied, the container 51 containing the standard concentration dyeing liquid is coupled to the accommodating groove 23, and the container 51 containing the standard concentration dyeing liquid can be directly combined into the capacity by manual means. Slot 23.

As described above, in the liquid metering device of the present invention, the movable wheel 20 of the Ferris wheel type is rotated on the support frame 32, so that the liquid of the container 51 can be used for the effect of 360 degrees of collision and agitation in the front-rear direction, so that the liquid can be mixed. More even. In addition, by using the valve control communication or isolation of the multi-way valve 54, the syringe unit 52 is coupled to the syringe 52 to precisely control the discharge amount of the liquid, and further, the syringe 52 and the container 51 are combined into a type. When performing the dip and discharge operations, it is not necessary to separately move the syringe 52 to the container 51 to inject the liquid as in the prior art described above, thereby not only achieving the effect of automatically controlling the metering and modulating the dyeing liquid, but also improving the measurement accuracy and Work efficiency to increase production.

The above is an embodiment of the present invention, and is merely for convenience of explanation. When it is not possible to limit the meaning of the present invention, various transformation designs according to the present invention should be included in the patent scope of the present invention.

10‧‧‧Installation rack

11‧‧‧ activity wheel

111‧‧‧rail

12‧‧‧掣动区区

20‧‧‧ activity round

21‧‧‧ Wheel body

30‧‧‧ support

31‧‧‧Ontology

32‧‧‧Support frame

33‧‧‧ lead seat

50‧‧‧Metric unit

60‧‧‧掣动单元

Claims (10)

A liquid metering device comprising: a movable wheel comprising a wheel body, a central shaft portion and a plurality of receiving grooves arranged in a ring shape in the wheel body, the movable wheel being driven to rotate; at least one metering The unit is disposed in each of the accommodating tanks, the metering unit comprises: a container combined with the accommodating tank, the container is filled with a predetermined liquid; a syringe, the syringe comprises a movable plug rod; a needle tube; a multi-way valve comprising a first duct, a second duct, a third duct, a ball, and a handle, the ball comprising a connecting passage, the ball being disposed in the middle of the multi-way valve, and the handle side being outwardly Inserting into the multi-way valve and touching the ball, the first pipe is connected to the container at one end, the second pipe is connected to the syringe at one end, the third pipe is connected to the needle tube; and a tilting unit, the tilting unit The first turbulent group includes a horizontal direction, and a second turbulence group that is perpendicular to the first turbulent group. The first turbulent group includes a first power source and a first a first clamping portion, the first power source is connected to the first screw, the first screw side is connected to the first clamping portion, and the first clamping portion is used for clamping the multi-way valve; the second clamping The set includes a second power source, a second screw, and a second clamping portion, the second power source is connected to the second screw, the second screw side is connected to the second clamping portion, and the second clamping portion is used for clamping The plunger of the syringe. The liquid metering device according to claim 1, wherein the connecting passage of the sphere is a T-shaped passage. The liquid metering device of claim 2, wherein the first clamping portion is further drivable by the first power source to push the handle to touch the ball to steer inside the multi-way valve, when the T-shaped channel makes The second pipe communicates with the syringe while communicating the first pipe to the discharge port of the container, and the third pipe does not communicate with the needle tube; otherwise, when the T-shaped channel connects the second pipe to the syringe while communicating the third pipe to the needle tube, The first conduit is not connected to the discharge opening of the container. The liquid metering device of claim 1, further comprising a support base comprising a body and a support frame, the support frame being erected on the body, the movable wheel being The central shaft portion shaft is disposed at the top end of the support frame, and the movable wheel is rotated on the support frame. The liquid metering device of claim 4, further comprising a mounting bracket defining a movable wheel region for mounting a movable wheel, the movable wheel region having two parallel correspondences The guide rail has a guide seat corresponding to the guide rail below the body of the support base, and the guide seat is guided to the guide rail for the movable wheel to move along the path of the guide rail. The liquid metering device of claim 5, further comprising a power unit disposed on a side of the support base for driving the support base and the movable wheel to move along a path of the guide rail . The liquid metering device according to claim 4, further comprising a transmission unit comprising a motor and a belt, the motor having a spindle disposed on the body of the support base The belt sleeve is disposed between the mandrel of the motor and the central shaft portion of the movable wheel to drive the motor Move the activity wheel to rotate. The liquid metering device according to claim 1, further comprising a weighing device, a receiving container placed on the weighing device, the receiving container for holding the metered liquid, the receiving container And the weighing device is correspondingly disposed below one side of the movable wheel. The liquid metering device of claim 7, further comprising a control unit for controlling the movement of the swaying unit, the first and second power sources, and the motor. The liquid metering device of claim 8, further comprising a control unit coupled to the weighing device, the weighing device providing data of the liquid weighing process to the control unit.