Distributing machine head and distributing and metering device comprising same

Abstract

The utility model provides a distribution machine head and a distribution metering device comprising the same. The distributing machine head comprises a machine head shell suitable for installing a distributing unit, a collecting box and a moving mechanism, wherein the collecting box and the moving mechanism are installed in the machine head shell. The machine head shell is provided with a first outlet located in the bottom of the machine head shell and corresponding to the output end of the distribution unit. The distribution unit is suitable for outputting reagents; the moving mechanism is suitable for driving the collecting box to move, so that the collecting box shields the first outlet and is suitable for collecting the reagent leaked by the distribution unit, or exposes the first outlet to allow the reagent to leave; the moving mechanism is provided with a second outlet corresponding to the first outlet; the collecting box is suitable for being detachably installed on the moving mechanism through the first outlet and the second outlet in sequence. According to the utility model, not only can the distribution unit be arranged in the distribution machine head so as to facilitate the use of the distribution unit, but also the collection box can be arranged in the distribution machine head so as to collect possibly leaked reagents, so that the pollution caused by the leakage of the reagents is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of dispensing and metering, in particular to a dispensing machine head and a dispensing and metering device comprising the same. Background Art

[0002] As is known to all, in biochemical experiments, it is often necessary to weigh and sample reagents, especially powdered reagents. However, existing weighing and sampling instruments are not only inconvenient to use, but also difficult to avoid the problem of reagent leakage. Utility Model Content

[0003] The embodiment of the utility model provides a dispensing head and a dispensing metering device including the same, which can not only set the dispensing unit in the dispensing head to facilitate the use of the dispensing unit, but also set a collection box in the dispensing head to collect the reagent that may leak, thereby preventing contamination caused by the leakage of the reagent.

[0004] To this end, the present invention provides the following technical solutions:

[0005] One aspect of the utility model embodiment is to provide a dispensing head. The dispensing head comprises a head housing suitable for installing a dispensing unit, a collecting box installed in the head housing, and a moving mechanism; the head housing has a first outlet located at the bottom thereof and corresponding to the output end of the dispensing unit; the dispensing unit is suitable for outputting a reagent; the moving mechanism is suitable for driving the collecting box to move so that the collecting box covers the first outlet and is suitable for collecting the reagent leaked from the dispensing unit, or exposes the first outlet to allow the reagent to leave; the moving mechanism has a second outlet corresponding to the first outlet; the collecting box is suitable for being detachably installed on the moving mechanism via the first outlet and the second outlet in sequence.

[0006] Optionally, the moving mechanism includes a gear suitable for rotation and a rack meshing with the gear; the rack has a connecting portion; the connecting portion has the second outlet; and the collecting box is detachably mounted on the second outlet.

[0007] Optionally, the collecting box is detachably threadedly connected to the second outlet.

[0008] Another aspect of the present invention is to provide a dispensing and metering device, which comprises the above-mentioned dispensing head and a weighing unit disposed below the dispensing head; the weighing unit is suitable for weighing the reagent output by the dispensing unit.

[0009] Optionally, the dispensing and metering device also includes: a windshield, which is installed on the dispensing head and located below the dispensing unit; a windshield shell, which is arranged below the windshield and is suitable for accommodating at least the weighing unit; wherein the dispensing head is suitable for driving the dispensing unit and the windshield to move toward the weighing unit and the windshield shell respectively, so that the dispensing unit is close to the weighing unit and the windshield is connected to the windshield shell up and down to close the weighing space between the dispensing unit and the weighing unit.

[0010] Optionally, the upper end of the wind shield is communicated with the distribution unit, and the lower end thereof is open toward the wind shield shell and is suitable for being connected to the wind shield shell from top to bottom.

[0011] Optionally, the dispensing and metering device further comprises: a test tube seat, which is suitable for being arranged on the weighing unit to fix the test tube, so as to receive the reagent through the test tube; a positioning assembly, which is suitable for positioning the test tube seat at the weighing center of the weighing unit; wherein the test tube seat and the positioning assembly respectively have a test tube seat cavity and a positioning cavity open upwards to respectively receive the test tube and the test tube seat.

[0012] Optionally, the positioning assembly comprises: a first annular positioning member, which is provided on the weighing unit and arranged around the weighing center; and a second annular positioning member, which has the positioning cavity and is suitable for being detachably assembled with the first annular positioning member.

[0013] Optionally, the windproof shell has an upper shell part suitable for partially shielding the weighing unit from above; the upper shell part has an upper opening corresponding to the weighing center; the second annular positioning member is assembled to the first annular positioning member from the upper opening, and extends from the inside of the windproof shell through the upper opening to the top of the windproof shell.

[0014] Optionally, the positioning assembly further includes a third annular positioning member; the third annular positioning member is sleeved outside the second annular positioning member and overlaps the circumference of the upper opening to close the gap between the second annular positioning member and the upper opening.

[0015] Compared with the prior art, the technical solution of the embodiment of the utility model has beneficial effects.

[0016] For example, not only is the dispensing unit disposed in the dispensing head to facilitate the use of the dispensing unit, but a collecting box is also disposed in the dispensing head to collect the reagent that may leak, thereby preventing contamination caused by the leakage of the reagent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a dispensing head in an embodiment of the utility model;

[0018] Figure 2 is a cross-sectional view of a dispensing head in an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the collecting box shielding the first outlet in the embodiment of the utility model;

[0020] Figure 4 is a schematic diagram of the collecting box exposing the first outlet in an embodiment of the utility model;

[0021] Figure 5 It is a schematic diagram of the collecting box after being disassembled from the moving mechanism in the embodiment of the utility model;

[0022] Figure 6 It is a structural schematic diagram of the distribution and metering device in a non-working state in an embodiment of the utility model;

[0023] Figure 7 It is a schematic diagram of the structure of the distribution and metering device in the working state in the embodiment of the utility model;

[0024] Figure 8 It is a partial cross-sectional view of the dispensing and metering device in the embodiment of the utility model in a non-working state;

[0025] Fig. 9 It is a partial cross-sectional view of the dispensing and metering device in the embodiment of the utility model in the working state.

[0026] Description of reference numerals:

[0027] 1 distribution metering device, 11 base, 111 horizontal part of base, 112 vertical part of base, 12 distribution head, 121 head shell, 121a first outlet, 121b head chamber, 122 collection box, 122a opening, 123 moving mechanism, 1231 gear, 1232 rack, 1232a second outlet, 1233 motor, 124 position switch, 13 distribution unit, 14 weighing unit, 14a weighing center, 15 wind shield, 16 wind shield shell, 16a shell upper part, 16b upper opening, 17 test tube holder, 17a test tube holder cavity, 18 positioning assembly, 18a positioning cavity, 181 first annular positioning member, 182 second annular positioning member, 182a second annular positioning member outer flange, 183 third annular positioning member, 183a third annular positioning member outer flange. DETAILED DESCRIPTION

[0028] In order to make the purpose, features and beneficial effects of the present invention more obvious and easy to understand, the specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It is understood that the specific implementation described below is only used to explain the present invention, rather than to limit the present invention. In addition, the description of the same or similar parts in different embodiments and the description of the parts, features, effects, etc. belonging to the prior art may be omitted.

[0029] In addition, for the convenience of description, only the parts related to the present invention are shown in the drawings instead of all structures. In addition, the same or similar reference numerals may be used in the drawings to refer to the same or similar parts in different embodiments.

[0030] Figure 1 It is a structural schematic diagram of a dispensing head in an embodiment of the utility model; Figure 2 is a cross-sectional view of a dispensing head in an embodiment of the utility model; Figure 3 It is a schematic diagram of the collecting box shielding the first outlet in the embodiment of the utility model; Figure 4 is a schematic diagram of the collecting box exposing the first outlet in an embodiment of the utility model; Figure 5 It is a schematic diagram of the collecting box after being disassembled from the moving mechanism in the embodiment of the utility model; Figure 6 It is a structural schematic diagram of the distribution and metering device in a non-working state in an embodiment of the utility model; Figure 7 It is a schematic diagram of the structure of the distribution and metering device in the working state in the embodiment of the utility model; Figure 8 It is a partial cross-sectional view of the dispensing and metering device in the embodiment of the utility model in a non-working state; Fig. 9 It is a partial cross-sectional view of the dispensing and metering device in the embodiment of the utility model in the working state.

[0031] Reference Figure 1 and Figure 5 , an embodiment of the utility model provides a dispensing head 12.

[0032] Specifically, the dispensing head 12 may include a head housing 121, a collection box 122 and a moving mechanism 123 respectively installed in the head housing 121. The head housing 121 is suitable for installing the dispensing unit 13, and the head housing 121 has a first outlet 121a located at the bottom thereof and corresponding to the output end of the dispensing unit 13; the dispensing unit 13 is suitable for outputting the reagent; the moving mechanism 123 is suitable for driving the collection box 122 to move, so that the collection box 122 covers the first outlet 121a and is suitable for collecting the reagent leaked from the dispensing unit 13, or exposes the first outlet 121a to allow the reagent output from the dispensing unit 13 to leave; the moving mechanism 123 has a second outlet 1232a corresponding to the first outlet 121a; the collection box 122 is suitable for being detachably installed on the moving mechanism 123 through the first outlet 121a and the second outlet 1232a in sequence.

[0033] In some embodiments, the dispensing head 12 further includes a head chamber 121 b located within the head housing 121 to receive the dispensing unit 13 .

[0034] In some embodiments, the dispensing unit 13 can be implemented using a sampler disclosed in the patent document with application publication number CN115508575A, which can at least control the mass flow rate of the sampling reagent by adjusting the movement speed of the reagent delivery mechanism such as a screw, thereby automatically and accurately sampling the reagent, especially the powder reagent.

[0035] In other embodiments, the dispensing unit 13 may also be implemented by any known and applicable reagent dispensing unit in the prior art.

[0036] In some embodiments, the dispensing unit 13 is adapted to output the reagent diagonally downward.

[0037] Correspondingly, the head chamber 121b also extends obliquely downward, so that the dispensing unit 13 is suitable for being received in the head chamber 121b obliquely downward.

[0038] In a specific implementation, the head chamber 121b is obliquely penetrated from top to bottom and includes an upper chamber opening at its top and a lower chamber opening at its bottom. The dispensing unit 13 is inserted obliquely downward from the upper chamber opening into the head chamber 121b, and after being inserted into the head chamber 121b, its output end is aligned with the lower chamber opening so that the reagent outputted by it can leave the head chamber 121b through the lower chamber opening.

[0039] In some embodiments, the upper and lower parts of the dispensing unit 13 are respectively fixedly connected to the head chamber 121b, for example, the upper and lower parts of the dispensing unit 13 can be respectively threaded or snap-fitted to the inner side wall of the head chamber 121b, which is not limited here. In this way, the dispensing unit 13 can be stably assembled in the head chamber 121b, which is conducive to improving the stability of the reagent dispensing output.

[0040] In a specific implementation, the dispensing unit 13 may leak reagents, that is, the reagents in the dispensing unit 13 may leak from the output end of the dispensing unit 13 in a non-sampling state, that is, in a state where the reagents do not need to be dispensed, thereby causing reagent contamination.

[0041] In order to avoid contamination caused by reagent leakage, the dispensing head 12 is also provided with a collection box 120 to collect the leaked reagent.

[0042] In a specific implementation, the collection box 122 is installed in the head housing 121 and is located below the dispensing unit 13. It is suitable for moving to cover the first outlet 121a at the bottom of the head housing 121 to collect the reagent leaked from the dispensing unit 13, or expose the first outlet 121a to allow the reagent to leave.

[0043] In a specific implementation, the dispensing head 12 further includes a driving mechanism 123 connected to the collection box 122. The driving mechanism 123 is suitable for driving the collection box 122 to move so that the collection box 122 covers the first outlet 121a and is suitable for collecting reagents, or the collection box 122 leaves and exposes the first outlet 121a.

[0044] In some embodiments, the driving mechanism 123 may include a motor 1233 installed in the head housing 121, a gear 1231 connected to the motor 1233, and a rack 1232 meshed with the gear 1231. The rack 1232 is fixedly connected to the collection box 122. The motor 1233 drives the gear 1231 to rotate, and the gear 1231 rotates to drive the rack 1232 to drive the collection box 122 to move.

[0045] In a specific implementation, the collecting box 122 is suitable for shielding the first outlet 121 a of the head housing 121 in a non-sampling state to collect the reagent that may leak from the dispensing unit 13 .

[0046] When sampling is required, the motor 1233 drives the gear 1231 to rotate, and the gear 1231 rotates to drive the rack 1232 to move the collection box 122 to move away and expose the first outlet 121a, thereby allowing the reagent output by the distribution unit 13 to leave through the lower opening of the chamber and the first outlet 121a in sequence.

[0047] When the sampling is completed, the motor 1233 drives the gear 1231 to rotate in the reverse direction, and the gear 1231 drives the rack 1232 to move in the reverse direction to re-cover the first outlet 121a, and the collecting box 122 is located below the output end of the dispensing unit 13 and the lower opening of the chamber to collect the reagent that may leak from the dispensing unit 13.

[0048] In a specific implementation, the collecting box 122 has an opening 121 which is suitable for opening toward the output end of the dispensing unit 13 and the lower opening of the chamber, so as to collect the reagent that may leak from the dispensing unit 13 .

[0049] In some embodiments, the dispensing head 12 further includes a position switch 124 disposed in the moving direction of the collection box 122 and the rack 1232. The position switch 124 is connected to the motor 1233 and is adapted to abut against the collection box 122 or the rack 1232 when the collection box 122 moves to trigger the motor 1233 to stop running.

[0050] In a specific implementation, two position switches 124 may be provided, which are respectively provided in the front-rear direction of movement of the collection box 122 and the rack 1232 .

[0051] When the rack 1232 drives the collection box 122 to move away from the first outlet 121a to expose the first outlet 121a, the rack 1232 can abut against one of the position switches 124 when the collection box 122 completely exposes the first outlet 121a, thereby triggering the position switch 124. When the position switch 124 is triggered, the motor 1233 connected thereto stops running, thereby stopping driving the collection box 122 to continue moving.

[0052] When the rack 1232 drives the collection box 122 to move in the reverse direction toward the first outlet 121a to cover the first outlet 121a, the rack 1232 can abut against another position switch 124 when the collection box 122 completely covers the first outlet 121a, thereby triggering the position switch 124. When the position switch 124 is triggered, the motor 1233 connected thereto stops running, thereby stopping driving the collection box 122 to continue to move in the reverse direction.

[0053] In a specific implementation, the collecting box 122 is detachably mounted on the moving mechanism 123, which is not only convenient for following the moving mechanism 123 to move, but also convenient for being disassembled to clean the reagents collected therein in time.

[0054] In some embodiments, the collection box 122 is detachably mounted on the rack 1232 .

[0055] In some embodiments, the rack 1232 has a connection portion having a second outlet 1232a corresponding to the first outlet 121a, and the collection box 122 can pass through the first outlet 121a from bottom to top and be threadedly connected to the second outlet 1232a.

[0056] In this way, the collection box 122 can be easily disassembled to clean the leaked reagents collected in the collection box 122 in time, thereby preventing chemical contamination and risks caused by chemical reactions caused by different reagents collected in the collection box 122.

[0057] Reference Figures 6 to 9 The embodiment of the utility model also provides a distribution and metering device 1.

[0058] Specifically, the dispensing and metering device 1 may include a dispensing head 12 provided in an embodiment of the utility model and a weighing unit 14 disposed below the dispensing head 12. The weighing unit 14 is suitable for weighing the reagent output by the dispensing unit 13.

[0059] In some embodiments, the weighing unit 14 may include a high-precision balance to weigh the reagents with high precision.

[0060] In some embodiments, the dispensing and metering device 1 further includes a windshield 15 and a windshield housing 16. The windshield 15 is installed on the dispensing head 12 and is located below the dispensing unit 13; the windshield housing 16 is arranged below the windshield 15 and is suitable for at least accommodating the weighing unit 14; the dispensing head 12 is also suitable for driving the dispensing unit 13 and the windshield 15 to move toward the weighing unit 14 and the windshield housing 16 respectively, so that the dispensing unit 13 is close to the weighing unit 14, and the windshield 15 and the windshield housing 16 are connected up and down to close the weighing space between the dispensing unit 13 and the weighing unit 14.

[0061] In a specific implementation, the dispensing and metering device 1 further comprises a base 11. The dispensing head 12 is mounted on the base 11 and can move up and down relative to the base 11 to drive the dispensing unit 13 and the wind shield 15 to move toward the weighing unit 14 and the wind shield housing 16 respectively.

[0062] In some embodiments, the base 11 may include a base horizontal portion 111 and a base vertical portion 112 connected to each other.

[0063] In a specific implementation, the dispensing head 12 can be installed on the vertical part 112 of the base; the weighing unit 14 and the windproof housing 16 can be installed on the horizontal part 111 of the base.

[0064] Furthermore, the dispensing and metering device 1 also includes a head driving mechanism installed on the vertical portion 112 of the base and connected to the dispensing head 12 to drive the dispensing head 12 to move up and down.

[0065] In a specific implementation, the wind shield 15 can be installed at the lower end of the head housing 121 and is suitable for moving up and down driven by the dispensing head 12.

[0066] In the embodiment of the present invention, since the dispensing unit 13 and the wind shield 15 are both arranged on the dispensing head 12, the dispensing head 12 is suitable for moving downward under the drive of the head driving mechanism and driving the dispensing unit 13 and the wind shield 15 to move toward the weighing unit 14 and the wind shield shell 16 respectively, so that the dispensing unit 13 is close to the weighing unit 14, and the wind shield 15 is connected to the wind shield shell 16 up and down to close the weighing space between the dispensing unit 13 and the weighing unit 14.

[0067] In the embodiment of the present invention, since the dispensing unit 13 is arranged in the head chamber 121b, the wind shield 15 is installed at the lower end of the head shell 121, and the wind shield 16 is arranged below the wind shield 15 and is suitable for accommodating at least the weighing unit 14, when the wind shield 15 moves downward to be connected with the wind shield shell 16 above and below, the weighing space between the dispensing unit 13 and the weighing unit 14 can be closed by the dispensing head 12, the wind shield 15 and the wind shield shell 16, thereby preventing the surrounding airflow from affecting the reagent weighing.

[0068] In some embodiments, the wind shield 15 is an annular structure that penetrates from top to bottom, and its upper end is connected to the distribution unit 13, and its lower end is open to the wind shield shell 16 and is suitable for connecting with the wind shield shell 16 from top to bottom.

[0069] In some embodiments, the wind shield 15 and the wind shield shell 16 are connected up and down, which can mean that the wind shield 15 and the wind shield shell 16 are connected inside and outside and their projections in the vertical plane overlap. For example, the lower end of the wind shield 15 can be tightly sleeved on the outer side of the upper part of the wind shield shell 16 or the inner side of the upper part.

[0070] In some embodiments, the dispensing and metering device 1 further includes a test tube holder 17 .

[0071] In a specific implementation, the test tube holder 17 is suitable for being disposed on the weighing unit 14 to fix the test tube, so as to receive the reagent outputted by the dispensing unit 13 through the test tube.

[0072] In some embodiments, the dispensing metering device further includes a positioning assembly 18 .

[0073] In a specific implementation, the positioning assembly 18 is adapted to position the test tube holder 17 at the weighing center 14 a of the weighing unit 14 to ensure that the test tube can be located above the weighing center 14 a of the weighing unit 14 , thereby ensuring the accuracy of weighing.

[0074] In a specific implementation, the test tube holder 17 may have a test tube holder cavity 17 a opened upward to receive a test tube.

[0075] In some embodiments, when the wind shield 15 moves downward and is connected to the wind shield housing 16, the test tube holder 17 with the test tube fixed thereon is adapted to pass upward through the wind shield 15 and the first outlet 121a and the second outlet 1232a to move below the dispensing unit 13 and place the test tube close to the dispensing unit 13. In this way, the distance of the reagent from the dispensing unit 13 to the test tube can be shortened, thereby reducing the influence of the external environment on the weighing.

[0076] In some embodiments, the two ends of the test tube holder 17 may have test tube holder cavities 17a of different sizes to respectively fix test tubes of different sizes. It is understandable that during use, only the test tube holder cavity 17a at one end of the test tube holder 17 can be used to fix the test tube at the same time, and the end suitable for fixing the test tube is arranged upward.

[0077] Furthermore, the positioning assembly 18 may have a positioning cavity 18 a opened upward to receive the test tube holder 17 .

[0078] When both ends of the test tube holder 17 have test tube holder cavities 17a of different sizes, both ends of the test tube holder 17 have structures matching with the positioning cavity 18a so as to be suitable for being fixed in the positioning cavity 18a.

[0079] In some embodiments, the middle of the test tube holder 17 and the positioning cavity 18a may have compatible structures and sizes so that the middle of the test tube holder 17 can be tightly embedded in the positioning cavity 18a, that is, the test tube holder 17 can be fixed in the middle of the positioning cavity 18a.

[0080] In some embodiments, the positioning assembly 18 may include a first annular positioning ring 181 and a second annular positioning ring 182. The first annular positioning member 181 is disposed on the weighing unit 14 and arranged around the weighing center 14a; the second annular positioning member 182 has a positioning cavity 18a and is suitable for being detachably assembled with the first annular positioning member 181.

[0081] In a specific implementation, the second annular positioning member 182 is located above the first annular positioning member 181 , and the second annular positioning member 182 can be installed or removed relative to the first annular positioning member 181 together with the test tube holder 17 for easy use.

[0082] In some embodiments, the windproof housing 16 has a housing upper portion 16a adapted to partially shield the weighing unit 14 from above; and the housing upper portion 16a has an upper opening 16b corresponding to the weighing center 14a in the vertical direction.

[0083] In a specific implementation, the second annular positioning member 182 can be assembled to the first annular positioning member 181 from the upper opening 16b of the windproof shell 16, and after being assembled to the first annular positioning member 181, it can also extend from the inside of the windproof shell 16 through the upper opening 16b to the top of the windproof shell 16.

[0084] Furthermore, the test tube holder 17 fixed to the second annular positioning member 182 can be at least partially located above the windproof shell 16, so that the test tube fixed in the test tube holder 17 is also at least partially located above the windproof shell 16, thereby making it easy for the test tube to receive the reagent output by the distribution unit 13.

[0085] In some embodiments, the positioning assembly 18 further includes a third annular positioning member 183. The third annular positioning member 183 can be sleeved outside the second annular positioning member 182 and overlapped around the upper opening 16b of the windproof shell 16 to close the gap between the second annular positioning member 182 and the upper opening 16b.

[0086] In some embodiments, the third annular positioning member 183 has a third annular positioning member outer flange 183a disposed around its circumference to overlap the upper edge of the upper opening 16b to close the gap between the third annular positioning member 183 and the upper opening 16b.

[0087] In some embodiments, the second annular positioning member 182 has a second annular positioning member outer flange 182a disposed around its circumference to overlap the third annular positioning member outer flange 183a to close the gap between the second annular positioning member 182 and the third annular positioning member 183 .

[0088] In this way, the sealing of the weighing space can be improved, and the interference of the surrounding airflow on the reagent weighing, especially the high-precision weighing, can be more effectively prevented.

[0089] Although specific embodiments of the present invention have been described above, these embodiments are not intended to limit the scope of the present invention, even when only a single embodiment is described with respect to specific features. The feature examples provided in the present invention are intended to be illustrative rather than limiting, unless otherwise stated. In specific implementations, the technical features of one or more dependent claims may be combined with the technical features of the independent claim, based on actual needs and where technically feasible, and the technical features of the corresponding claims may be combined in any appropriate manner rather than just by the specific combinations listed in the claims.

[0090] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

Claims

1. A dispensing head (12), characterized in that: The invention comprises a head shell (121) suitable for installing a dispensing unit (13), a collecting box (122) and a moving mechanism (123) installed in the head shell (121); the head shell (121) has a first outlet (121a) located at the bottom thereof and corresponding to the output end of the dispensing unit (13); the dispensing unit (13) is suitable for outputting a reagent; the moving mechanism (123) is suitable for driving the collecting box (122) to move, so that the collecting box (122) covers the first outlet (121a) and is suitable for collecting the reagent leaked from the dispensing unit (13), or exposes the first outlet (121a) to allow the reagent to leave; the moving mechanism (123) has a second outlet (1232a) corresponding to the first outlet (121a); ​​the collecting box (122) is suitable for being detachably installed on the moving mechanism (123) via the first outlet (121a) and the second outlet (1232a) in sequence.

2. The dispensing head (12) according to claim 1, characterized in that: The moving mechanism (123) comprises a gear (1231) suitable for rotation and a rack (1232) meshing with the gear (1231); The rack (1232) has a connecting portion; the connecting portion has the second outlet (1232a); The collecting box (122) is detachably mounted on the second outlet (1232a).

3. The dispensing head (12) according to claim 2, characterized in that: The collecting box (122) is detachably threadedly connected to the second outlet (1232a).

4. A dispensing and metering device (1), characterized in that: It comprises a dispensing head (12) as claimed in any one of claims 1 to 3 and a weighing unit (14) arranged below the dispensing head (12); the weighing unit (14) is suitable for weighing the reagent output by the dispensing unit (13).

5. The dispensing and metering device (1) according to claim 4, characterized in that: Also includes: A wind shield (15) mounted on the dispensing head (12) and located below the dispensing unit (13); A windproof housing (16), which is arranged below the windproof cover (15) and is suitable for accommodating at least the weighing unit (14); The dispensing head (12) is suitable for driving the dispensing unit (13) and the wind shield (15) to move toward the weighing unit (14) and the wind shield shell (16) respectively, so that the dispensing unit (13) is close to the weighing unit (14), and the wind shield (15) and the wind shield shell (16) are connected up and down to close the weighing space between the dispensing unit (13) and the weighing unit (14).

6. The dispensing and metering device (1) according to claim 5, characterized in that: The upper end of the wind shield (15) is in communication with the distribution unit (13), and the lower end thereof is open toward the wind shield shell (16) and is suitable for being connected to the wind shield shell (16) from top to bottom.

7. The dispensing and metering device (1) according to any one of claims 5 or 6, characterized in that: Also includes: a test tube holder (17) adapted to be arranged on the weighing unit (14) to fix the test tube so as to receive the reagent through the test tube; A positioning assembly (18) adapted to position the test tube holder (17) at a weighing center (14a) of the weighing unit (14); The test tube seat (17) and the positioning assembly (18) respectively have a test tube seat cavity (17a) and a positioning cavity (18a) open upwards, so as to receive the test tube and the test tube seat (17) respectively.

8. The dispensing and metering device (1) according to claim 7, characterized in that: The positioning assembly (18) comprises: A first annular positioning member (181) is provided on the weighing unit (14) and is arranged around the weighing center (14a); A second annular positioning member (182) has the positioning cavity (18a) and is suitable for being detachably assembled with the first annular positioning member (181).

9. The dispensing and metering device (1) according to claim 8, characterized in that: The windproof housing (16) has a housing upper portion (16a) suitable for partially shielding the weighing unit (14) from above; The upper part (16a) of the shell has an upper opening (16b) corresponding to the weighing center (14a); the second annular positioning member (182) is assembled to the first annular positioning member (181) from the upper opening (16b), and extends from the inside of the windproof shell (16) through the upper opening (16b) to the top of the windproof shell (16).

10. The dispensing and metering device (1) according to claim 9, characterized in that: The positioning assembly (18) further comprises a third annular positioning member (183); the third annular positioning member (183) is sleeved outside the second annular positioning member (182) and overlaps the circumference of the upper opening (16b) to close the gap between the second annular positioning member (182) and the upper opening (16b).

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