CN112619497A

CN112619497A - Biochemical analysis appearance feed unit dissolves rabbling mechanism

Info

Publication number: CN112619497A
Application number: CN202110258541.4A
Authority: CN
Inventors: 邓欢; 潘琰; 贺绍勇; 邓燕娟
Original assignee: Jiangxi Feituo Biotechnology Co ltd
Current assignee: Jiangxi Feituo Biotechnology Co ltd
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2021-04-09
Anticipated expiration: 2041-03-10
Also published as: CN112619497B

Abstract

The invention discloses a dissolution stirring mechanism of a feeding unit of a biochemical analyzer, which comprises an upper layer disc support plate and a lower layer disc support plate, wherein a mandrel is arranged at the center of the upper layer disc support plate and the lower layer disc support plate through a bearing assembly, a series of through holes are distributed at the peripheral edges of the upper layer disc support plate and the lower layer disc support plate, a rotary drum part is arranged in each through hole through a shaft sleeve, an inherent edge gear is sleeved outside each rotary drum part, a central gear is fixed on the mandrel and is meshed with each edge gear, a driven gear is arranged at the lower part of the lower layer disc support plate or the edge of the lower layer disc support plate, a rotary driving motor is arranged on a base, a driving gear is arranged on. The invention can realize that the corresponding reagent container parts positioned at the edges of the upper layer disk carrier plate and the lower layer disk carrier plate can rotate while revolving, realize the rotation mixing and stirring effect of a single reagent container part through rotation, and realize the revolution mixing and stirring effect through changing the revolution rate.

Description

Biochemical analysis appearance feed unit dissolves rabbling mechanism

Technical Field

The invention belongs to the field of biochemical technology, and particularly relates to a technology for improving dissolving and stirring functions of a feeding unit of a biochemical analyzer.

Background

Biochemical analyzers, also commonly referred to as biochemics, are instruments that use the principle of optoelectric colorimetry to measure a particular chemical component in a body fluid. Because of its fast measuring speed, high accuracy and small reagent consumption, it is widely used in hospitals, epidemic prevention stations and family planning service stations. The efficiency and the income of the conventional biochemical test can be greatly improved by matching the use. The sample adding system comprises a sample turntable, and dozens of small sample cups can be placed in the sample turntable. Some analyzers can directly use test tubes for containing samples, some analyzers are also provided with bar code reading devices, bar code information on the sample test tubes can be identified, samples do not need to be numbered, test reports of patients can be printed out without inputting patient data, reagent boxes of different analyzers can contain different quantities, and 20 reagents can be generally contained. Some reagent chambers are provided with a refrigerating device, and reagent chambers provided with bar code identification devices can be placed at any position of a reagent box.

The dry biochemical analyzer disclosed in publication No. CN 111921393 a is used to solve the problem that when the dry biochemical analyzer stirs and dissolves the liquid sample and the reagent carrier inside, the reagent carrier is not dissolved because the inside forms a vortex due to the rotation. The middle of the inside of its equipment main part is provided with the feeding unit, the feeding unit still includes supporting baseplate, the centre of supporting baseplate upper end is provided with the backup pad, upward be provided with on the backup pad and remove the post, the lower extreme that removes the post is provided with down the spliced pole, the centre that removes post and spliced pole down is provided with the axis of rotation, driving motor is installed to the lower extreme of spliced pole down, the outside of spliced pole is provided with the connecting rod down, the outside that lower spliced pole one end was kept away from to the connecting rod is provided with nested body of rod, the inside groove that runs through that is provided with of nested body of rod. Therefore, the scheme can realize the functions of driving, rotating and shaking a plurality of rotary drum parts. However, the multiple bowl parts in the dry biochemical analyzer of CN 111921393 a do not rotate separately, and the bowl parts in this technique do revolution motion with the main body turntable (solid material mechanism) at the same time, this technical solution aims to eliminate the vortex formed in the corresponding reagent container parts, and when the above reagent container parts can only revolve, the vortex effect is not obvious or present, and after the mixed liquid rotates synchronously with the bowl parts, because the revolution speed of the mixed liquid is the same as the revolution speed of the bowl parts and the main body turntable, the mixed liquid basically does not have the stirring function, at this time, this known technique mainly changes the mixed liquid state in each bowl part by changing the revolution speed and the traverse mode to make it disturbed.

Disclosure of Invention

Aiming at the defects and problems of the biochemical analyzer in the prior art in the using process, the invention provides a dissolving and stirring mechanism of a biochemical analyzer feeding unit, which is used for realizing the application effect of a combination of various mixing and stirring functions.

The technical scheme for solving the technical problems is as follows:

a dissolution stirring mechanism of a feeding unit of a biochemical analyzer comprises an upper-layer disc support plate and a lower-layer disc support plate which are fixed together by an edge connecting rod, wherein the centers of the upper-layer disc support plate and the lower-layer disc support plate are respectively provided with a mandrel through a bearing assembly; the central gear is fixed on the mandrel and meshed with the edge gears, the driven gear is arranged at the lower part of the lower disc support plate or at the edge of the lower disc support plate, meanwhile, the base is provided with a rotary driving motor, a rotating shaft of the rotary driving motor is provided with a driving gear, and the driving gear is meshed with the driven gear.

Furthermore, transition gears are arranged between the upper layer disk carrier plate and the lower layer disk carrier plate through bearings, each transition gear is meshed with a corresponding edge gear respectively, and each transition gear is also meshed with a central gear simultaneously.

Furthermore, the number of the transition gears is two, and the two transition gears arranged along the radial direction are respectively meshed to form a gear set which is simultaneously meshed with the edge gear and the central gear respectively.

Further, a tube cavity is arranged in the center of the rotating shaft of each transition gear and used for placing a corresponding reagent container component.

Further, the tip of dabber is provided with spline structure, matches the cover simultaneously and is equipped with the spline housing, and this spline housing passes through the bearing and installs upper disc support plate or lower floor's disc support plate to the dabber slides for the spline housing axial, is lieing in the running roller is installed to sun gear's upside or downside simultaneously the lower surface of upper disc support plate or the upper surface of lower floor's disc support plate are provided with convex step part, and the running roller is with its jack-up or by its jack-up behind the step part when following sun gear rotation, and the indirect upper disc support plate that makes is jack-up then falls down in order to produce the effect of jolting.

Furthermore, the step part is a wedge-shaped body with one side being an inclined surface and the other side being a vertical surface.

Furthermore, the step part is an elastic sheet fixed on the inner part of the upper layer disc carrier plate or the lower layer disc carrier plate, the elastic sheet is folded into a structure with one side being an inclined plane and the other side being an upright plane, a through hole is arranged on the corresponding carrier plate, the elastic sheet on one side of the upright plane is inserted into the through hole, a nut is embedded on the carrier plate on the rear side of the inclined plane, an adjusting screw rod is installed in the nut, and the tail end of the screw rod is supported on the inner wall of the inclined plane by rotating the adjusting screw rod.

Furthermore, the upper edge and/or the lower edge of the edge gear in the middle of the rotating cylinder part are distributed with annular platforms which protrude outwards, and the annular platforms are respectively positioned at the upper side and the lower side of the outer edge of the central gear.

Furthermore, the central gear and the mandrel are sleeved together through a spline structure, a concave part is arranged at the center of the upper layer disc support plate or the lower layer disc support plate and used as a central spring seat for sleeving the central spring, meanwhile, a roller is arranged on the end surface, far away from the central spring, of the central gear, a convex step part is arranged on the inner surface of the lower layer disc support plate or the upper layer disc support plate, and when the roller passes through the step part, the roller is jacked up by the step part and then falls down to generate a bumping effect.

The invention has the beneficial effects that:

one embodiment of the invention can realize that the corresponding reagent container parts positioned at the edges of the upper disc support plate and the lower disc support plate can rotate while revolving, realize the rotation mixing and stirring effect of the single reagent container part through rotation, and realize the revolution mixing and stirring effect through changing the revolution speed.

In other embodiment modes, the lifting vibration function of the upper layer disk carrier plate and the lower layer disk carrier plate can be realized, so that the device has a vibration mixing function of up-and-down bumping while revolving and rotating.

The invention also includes the ability to effect radially varying traversing mixing of the respective reagent container components.

The invention can also extend the transmission path and reduce the speed ratio by additionally arranging the transition gear, and has the function of accommodating corresponding reagent container parts by designing the equivalent structure of the transition gear and the edge gear, thereby changing the revolution radius and the rotation rate of each reagent container part and meeting various selection functions of different reagent mixing degree requirements.

Drawings

Fig. 1 is a schematic view of the mounting structure of the present invention.

Fig. 2 is one of the schematic sectional structures of fig. 1.

Fig. 3 is a top view of fig. 2.

Fig. 4 is a schematic diagram of the apparatus to which the present invention is applied.

Fig. 5 is a second schematic cross-sectional view of fig. 1.

Fig. 6 is a top view of fig. 5.

Fig. 7 is a schematic view of a step part of an elastically adjustable type.

Fig. 8 is a third schematic sectional view of fig. 1.

Fig. 9 is one of the top views of fig. 8.

Fig. 10 is a second plan view of fig. 8.

Fig. 11 is a schematic view of a sun gear shift.

Fig. 12 is a diagram illustrating an application state of fig. 11.

Fig. 13 is an enlarged structural view of a portion a in fig. 12.

Reference numbers in the figures: the device comprises a device main body 1, a data display screen 2, a feeding unit 3, a feeding sealing plate 4, a handle 5, a base 6, an upper-layer disc carrier plate 8, a lower-layer disc carrier plate 9, an edge connecting rod 10, a shaft sleeve 11, a drum part 12, a test tube 13, an edge gear 14, a central gear 15, a central gear replacing part 15a, a mandrel 16, a thrust bearing 17, a roller bearing 18, a rotary driving motor 19, a driving gear 20, a driven gear 21, a spline sleeve 22, a spline structure 23, a ring platform 24, a roller 25, a step part 26, an inclined plane 27, a vertical plane 28, a perforation 29, a nut 30, an adjusting screw 31, a transition gear 32, a sliding hole 33, a sliding block 34, a spring seat 35, a thrust spring 36, a friction surface 37 and.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Example 1: the invention discloses a dissolution stirring mechanism of a feeding unit of a biochemical analyzer, which comprises an upper layer disk carrier plate 8 and a lower layer disk carrier plate 9 which are fixed together by an edge connecting rod 10, wherein the edge connecting rod 10 can be replaced by a plate structure, so that the upper layer disk carrier plate 8 and the lower layer disk carrier plate 9 are integrated and can synchronously rotate, and the mechanism is applied to the biochemical analyzer shown in figure 4.

As shown in fig. 2, the centers of the upper disc carrier plate 8 and the lower disc carrier plate 9 are respectively provided with a mandrel 16 through a bearing assembly, specifically, the upper end of the mandrel 16 is provided in a central axial hole of the upper disc carrier plate 8 through a thrust bearing 17, and the lower end of the mandrel 16 is provided in a central axial hole of the lower disc carrier plate 9 through a roller bearing 18. In this mechanism, the spindle 16 is fixedly supported by the base 6, and the bottom of the spindle 16 is fixed or mounted in the base.

Meanwhile, a series of through holes are distributed on the peripheral edges of the upper disc carrier plate 8 and the lower disc carrier plate 9, as shown in fig. 3, the distance between the center of each through hole and the mandrel is equal, that is, each through hole is on the same revolution circumferential surface.

Furthermore, a rotating cylinder part 12 is arranged in each through hole through a shaft sleeve 11, so that the rotating cylinder part 12 can rotate in the shaft sleeve 11, the rotating cylinder part 12 is used for matching and sleeving a corresponding reagent container (such as a test tube 13), and the rotating cylinder part 12 is used as a carrier of the corresponding reagent container part and drives the corresponding reagent container part to rotate together when rotating. The sleeve 11 is a ceramic bushing with a smooth inner surface, but may also be other parts with a smooth surface or capable of providing smooth rotation, such as bearings, etc.

As shown in fig. 2, each drum member 12 houses an inherent edge gear 14, the edge gear 14 being located between the upper and lower

disc carrier plates

8, 9; meanwhile, a central gear 15 is fixed on the mandrel 16 between the upper disc carrier plate 8 and the lower disc carrier plate 9. The sun gear 15 meshes with the edge gears 14.

A driven gear 21 is arranged at the lower part of the lower disc carrier plate 9 or the edge thereof, a rotary driving motor 19 is arranged on the base 6, a driving gear 20 is arranged on the rotating shaft of the rotary driving motor 19, and the driving gear 20 is meshed with the driven gear 21.

As can be seen from the structural relationship of fig. 2, the spindle 16 and the central gear 15 are fixed and cannot rotate, and when the rotating shaft of the rotating driving motor 19 rotates, the driven gear 21 at the bottom of the lower disc carrier plate 9 can be driven to rotate, so as to drive the upper disc carrier plate 8 and the lower disc carrier plate 9 to rotate together.

Further, when the upper disc carrier plate 8 and the lower disc carrier plate 9 rotate, a plurality of drum members 12 shown in fig. 3 are driven to rotate circumferentially along the sun gear 15, so that the respective drum members 12 rotate on their own axes. Compared with the dry biochemical analyzer of CN 111921393 a, the structural design can realize the function of rotation of multiple bowl parts 12, but the multiple bowl parts in the dry biochemical analyzer of CN 111921393 a do not rotate separately, the bowl parts in the technology do revolution motion with the main body turntable (solid material mechanism) at the same time, after the mixed liquid rotates synchronously with the bowl parts, the mixed liquid will not stir basically because the revolution speed of the mixed liquid is consistent with the revolution speed of the bowl parts and the main body turntable, at this time, the known technology can only change the mixed liquid state in each bowl part by changing the revolution speed and the traverse mode to make it disturb. However, the present invention, which adopts the configuration shown in fig. 2, can realize the stirring function by the respective bowl members rotating on their own axes, and further can realize the mixing and stirring function by combining the revolution and rotation of the mixed liquid in the plurality of bowl members 12 when the main body disks (the upper disk carrier 8 and the lower disk carrier 9) are set to revolve at a variable speed. The rotation limit speed is 400-800 rpm, and the revolution speed is 30-80 rpm.

Example 2: on the basis of embodiment 1, further, transition gears 32 are mounted between the upper disc carrier plate 8 and the lower disc carrier plate 9 through bearings, as shown in fig. 8 and 9, the rotating shafts of the transition gears 32 are respectively mounted in the corresponding shaft holes of the upper disc carrier plate 8 and the lower disc carrier plate 9 through shaft sleeves, the transition gears 32 are respectively meshed with the corresponding edge gears 14, and the transition gears 32 are also meshed with the central gear 15. As can be seen from fig. 9, each transition gear 32 meshes with two adjacent edge gears 14, respectively.

Example 3: in addition to embodiment 2, two radially arranged transition gears 32 are provided, which mesh with each other to form a gear set that simultaneously meshes with the edge gear 14 and with the sun gear 15, respectively. The design can prolong the transmission path and reduce the speed ratio. Meanwhile, the center of the rotating shaft of each transition gear can be provided with a pipe cavity for arranging corresponding reagent container components, so that after the transformation is carried out, corresponding rotary drum components 12 are distributed at different radius positions of the upper-layer disc carrier plate 8 and the lower-layer disc carrier plate 9, and are used for selective application of different stirring requirements.

Example 4: in addition to embodiment 1, a spline structure 23 is further provided at the end of the mandrel, as shown in fig. 5 and 6. Meanwhile, a spline sleeve 22 is also arranged and sleeved in a matching way, as can be seen from fig. 5, the spline sleeve 22 is mounted on the upper disc carrier plate 8 or the lower disc carrier plate 9 through a bearing, so that the mandrel 16 can axially slide relative to the spline sleeve 22.

On the basis, a roller 25 is installed on the upper side or the lower side of the central gear, and correspondingly, a protruding step part 26 is arranged on the lower surface of the upper layer disk carrier plate 8 or the upper surface of the lower layer disk carrier plate 9, and when the roller 25 passes through the step part, the roller is jacked up or jacked up, so that the upper layer disk carrier plate 8 is jacked up and then falls down to generate a bumping effect. In fig. 5, a roller 25 is installed on the upper side of the sun gear 15, and a step member 26 is installed on the lower surface of the upper disc carrier 8.

Wherein the step part 26 is a wedge-shaped body with one side being a bevel and the other side being a facade as shown in fig. 5.

The revolution speed range of the main body disc consisting of the upper layer disc carrier plate 8 and the lower layer disc carrier plate 9 is 30-80 r/min, the rotation limit speed of the drum part 12 is 400-.

Example 5: on the basis of embodiment 4, the step part is further modified, as shown in fig. 7, and is a spring sheet fixed on the inside of the upper layer disk carrier plate 8 or the lower layer disk carrier plate 9, the spring sheet is folded to have a structure that one side is an inclined surface 27 and the other side is a vertical surface 28, a through hole 29 is arranged on the corresponding carrier plate, the spring sheet on the vertical surface side is inserted into the through hole, a nut 30 is embedded on the carrier plate on the rear side of the inclined surface, an adjusting screw rod 31 is arranged in the nut, the tail end of the screw rod can be supported on the inner wall of the inclined surface 27 by rotating the adjusting screw rod 31, and the ejecting degree of the inclined surface is further changed, so that the function of.

Example 6: on the basis of embodiment 1, the upper edge and/or the lower edge of the edge gear 14 in the middle of each drum part 12 are respectively provided with an outwardly protruding ring platform 24, the ring platforms are respectively positioned on the upper side and the lower side of the outer edge of the central gear 15, and the ring platform structure is used for limiting the edge gear 14 and the central gear 15.

Meanwhile, the central gear 15 and the mandrel 16 are sleeved together through a spline structure (not shown in the figure), so that the two can slide along the axial direction.

A concave part is arranged at the center of the upper disc carrier plate 8 or the lower disc carrier plate 9 to serve as a central spring seat for sleeving a central spring (both the central spring seat and the central spring are not shown in the figure), and the central spring can enable the central gear to be pressed to approach the other side (the lower disc carrier plate 9 or the upper disc carrier plate 8).

Further, a roller 25 is mounted on the end surface of the central gear 15 on the side far away from the central spring, and a convex step part 26 is arranged on the inner surface of the lower layer disk carrier plate 9 or the upper layer disk carrier plate 8, and when the roller 25 passes through the step part, the roller is jacked up by the step part and then falls down, so that a bumping effect is generated. For example, in the embodiment, the center spring seat and the center spring may be disposed on the upper side of the central gear 15, the roller 25 may be disposed on the lower side of the central gear 15, and the step part 26 may be disposed on the upper surface of the lower disc carrier plate 9, so that, unlike embodiment 4, the liquid in the test tube in the drum part 12 may be shaken to generate a bumping effect by the slight shock of the central gear 15.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. For example, the inventor also provides a central gear structure which can be improved as shown in fig. 11, and it can be seen from the figure that the outer edge of the central gear replacement part 15a includes a friction surface 37, and the friction surface is not a circumferential surface, but is a convex-concave shape with a peak groove on the basis of the circumferential surface, and the radius of the peak surface is different from that of the groove surface, so that after applying the central gear replacement part to the solution described in embodiment 1, as shown in fig. 12 and 13, it is further necessary to provide radial sliding holes 33 (flat holes distributed along the radial direction) at the edge of the upper disc carrier plate 8 or the lower disc carrier plate 9, and the flat holes are matched with sliding blocks 34 (the sliding blocks and the flat holes are provided with a limiting structure so as not to fall off), and at the same time, thrust springs 36 are respectively mounted on one side or both sides of the sliding blocks through spring seats 35 so that. Therefore, when the central gear replacing component 15a rotates, the friction surface 37 at the edge can contact and drive the outer friction surface 38 positioned at the outer side of the rotary drum component 12 to rotate, and simultaneously, the slide blocks 34 can be driven to repeatedly move along the radial direction due to the convex-concave shape of the peak groove at the outer edge of the central gear replacing component 15a, so that each rotary drum component 12 and the corresponding reagent container component can be driven to repeatedly shake along the radial direction while rotating and revolving, and the function of all-round mixing and stirring is achieved. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims

1. The utility model provides a biochemical analysis appearance feed unit dissolves rabbling mechanism, includes an upper disc support plate (8) and lower floor's disc support plate (9), and both are fixed by marginal connecting rod (10) and are in the same place, its characterized in that: the center of the upper layer disc carrier plate (8) and the center of the lower layer disc carrier plate (9) are respectively provided with a mandrel (16) through a bearing assembly, the mechanism further comprises a base (6) for fixedly supporting the mandrel (16), a series of through holes are distributed on the peripheral edges of the upper layer disc carrier plate (8) and the lower layer disc carrier plate (9), the distance between the center of each through hole and the mandrel (16) is equal, a rotary drum part (12) is arranged in each through hole through a shaft sleeve (11) so that the rotary drum part (12) can rotate in the shaft sleeve (11), the rotary drum part (12) is used for matching and sleeving a corresponding reagent container, an inherent edge gear (14) is sleeved outside each rotary drum part (12), and the edge gear (14) is positioned between the upper layer disc carrier plate (8) and the lower layer disc carrier plate (9); a central gear (15) is fixed on a mandrel (16), the central gear (15) is meshed with each edge gear (14), a driven gear (21) is arranged at the lower part of the lower-layer disc carrier plate (9) or the edge of the lower-layer disc carrier plate, a rotary driving motor (19) is arranged on the base (6), a driving gear (20) is arranged on a rotating shaft of the rotary driving motor (19), and the driving gear (20) is meshed with the driven gear (21).

2. The biochemical analyzer feeding unit dissolution stirring mechanism of claim 1, wherein: and transition gears (32) are arranged between the upper layer disk carrier plate (8) and the lower layer disk carrier plate (9) through bearings, each transition gear (32) is respectively meshed with the corresponding edge gear (14), and each transition gear (32) is simultaneously meshed with the central gear (15).

3. The biochemical analyzer feeding unit dissolution stirring mechanism according to claim 2, wherein: the number of the transition gears (32) is two, and the two transition gears (32) arranged along the radial direction are respectively meshed to form a gear set which is simultaneously meshed with the edge gear (14) and the central gear (15).

4. The biochemical analyzer feeding unit dissolution stirring mechanism of claim 3, wherein: a lumen is provided centrally of the axis of rotation of each said transition gear (32) for seating a respective reagent container component.

5. The biochemical analyzer feeding unit dissolution stirring mechanism of claim 1, wherein: the end part of the mandrel (16) is provided with a spline structure (23), the spline structure is simultaneously sleeved with a spline sleeve (22) in a matching mode, the spline sleeve (22) is installed on an upper-layer disk carrier plate (8) or a lower-layer disk carrier plate (9) through a bearing, the mandrel (16) axially slides relative to the spline sleeve (22), a roller (25) is installed on the upper side or the lower side of the central gear (15), a convex step part (26) is arranged on the lower surface of the upper-layer disk carrier plate (8) or the upper surface of the lower-layer disk carrier plate (9), the roller (25) jacks or is jacked up after passing through the step part (26) when rotating along with the central gear (15), and the upper-layer disk carrier plate (8) is indirectly jacked up and then falls down to generate a bumping effect.

6. The biochemical analyzer feeding unit dissolution stirring mechanism of claim 5, wherein: the step part (26) is a wedge-shaped body with a bevel (27) on one side and a facade (28) on the other side.

7. The biochemical analyzer feeding unit dissolution stirring mechanism of claim 5, wherein: the step part (26) is an elastic sheet fixed on the inner part of the upper layer disc carrier plate (8) or the lower layer disc carrier plate (9), the elastic sheet is folded into a structure with one side being an inclined plane (27) and the other side being a vertical plane (28), a through hole (29) is arranged on the corresponding carrier plate, the elastic sheet on one side of the vertical plane (28) is inserted into the through hole (29), a nut (30) is embedded on the carrier plate positioned on the rear side of the inclined plane (27), an adjusting screw rod (31) is installed in the nut, and the tail end of the screw rod is supported on the inner wall of the inclined plane (27) by rotating the adjusting screw rod (31).

8. The biochemical analyzer feeding unit dissolution stirring mechanism of claim 1, wherein: the upper edge and/or the lower edge of the edge gear (14) in the middle of the rotary drum component (12) are distributed with annular platforms (24) protruding outwards, and the annular platforms (24) are respectively positioned at the upper side and the lower side of the outer edge of the central gear (15).

9. The feeding unit dissolution stirring mechanism of biochemical analyzer according to claim 8, wherein the central gear (15) and the mandrel (16) are sleeved together by a spline structure (23), a concave portion is provided at the center of the upper disc carrier (8) or the lower disc carrier (9) to serve as a central spring seat for sleeving the central spring, a roller (25) is installed on the end surface of the central gear (15) away from the central spring, a convex step part (26) is provided on the inner surface of the lower disc carrier (9) or the upper disc carrier (8), and the roller (25) is jacked up by the step part (26) and then falls down to generate a bumping effect after passing through the step part (26).