A biochemical analyzer

Abstract

The present invention discloses a biochemical analyzer, comprising: a incubation tray including inner ring cuvettes and outer ring cuvettes; a reagent tray including an inner ring reagent tray and an outer ring reagent tray; four pipetting assemblies arranged circumferentially around the incubation tray, the pipetting needles of the first pipetting assembly and the third pipetting assembly can rotate to the inner ring colorimetric ring and the outer ring reagent tray, and the pipetting needles of the second pipetting assembly and the fourth pipetting assembly can rotate to the outer ring colorimetric ring and the inner ring reagent tray; the first pipetting assembly is adjacent to the second pipetting assembly, with opposite rotation directions and a rotation angle of a reciprocal circumferential angle; the third pipetting assembly is adjacent to the fourth pipetting assembly, with opposite rotation directions and a rotation angle of a reciprocal circumferential angle. Both the incubation tray and the reagent tray are provided with inner and outer circles, four pipetting assemblies are provided, the rotation directions of two adjacent pipetting assemblies are opposite and the rotation angles are reciprocal circumferential angles, the adjacent pipetting assemblies correspond to different positions of the incubation tray and the reagent tray, and the four pipetting assemblies can operate simultaneously, improving the working efficiency and ensuring the stability of operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a biochemical analyzer. Background Art

[0002] In the current field of biochemical detection, in high-speed biochemical analyzers and other sample addition devices, corresponding pipetting devices are usually provided to meet the corresponding pipetting requirements such as sampling and sample addition, and to ensure the corresponding inspection operation requirements.

[0003] In order to improve the detection efficiency, multiple pipetting devices may be provided on a biochemical analyzer. However, the movement and working angles of these pipetting devices may interfere with each other. In view of this, a biochemical analyzer is disclosed in the present application, and the normal use of the pipetting device is ensured by limiting the layout and angle of the pipetting device.

[0004] Therefore, how to layout the pipetting device to ensure its normal use is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a biochemical analyzer, which ensures the normal use of the pipetting device by limiting the layout and angle of the pipetting device.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A biochemical analyzer, comprising:

[0008] An incubation plate, the incubation plate includes an inner ring cuvette and an outer ring cuvette, and the inner ring cuvette and the outer ring cuvette are respectively arranged circumferentially;

[0009] A reagent disk, the reagent disk includes an inner ring reagent disk and an outer ring reagent disk, and the inner ring reagent disk and the outer ring reagent disk are respectively arranged circumferentially;

[0010] A first pipetting assembly, a second pipetting assembly, a third pipetting assembly, and a fourth pipetting assembly arranged circumferentially around the incubation plate, the pipetting needles of the first pipetting assembly and the third pipetting assembly can rotate to add samples to the inner ring cuvettes and the outer ring reagent disks, and the pipetting needles of the second pipetting assembly and the fourth pipetting assembly can rotate to add samples to the outer ring cuvettes and the inner ring reagent disks;

[0011] The first pipetting assembly is adjacent to the second pipetting assembly, and the first pipetting assembly and the second pipetting assembly rotate in opposite directions, and the rotation angle is a circumferential angle;

[0012] The third pipetting component is adjacent to the fourth pipetting component, and the third pipetting component and the fourth pipetting component rotate in opposite directions, and the rotation angle is a mutual circumferential angle.

[0013] Preferably, in the above-mentioned biochemical analyzer, the first pipetting assembly, the second pipetting assembly, the third pipetting assembly and the fourth pipetting assembly all include:

[0014] a needle arm assembly, the needle arm assembly comprising a pipetting needle;

[0015] a support base, the needle arm assembly being rotatably connected to the support base;

[0016] A limiting assembly is used to limit the axial movement of the pipetting needle.

[0017] Preferably, in the above-mentioned biochemical analyzer, the support base comprises:

[0018] frame,

[0019] a ball spline shaft assembly, one end of which is connected to the needle arm assembly and the other end of which is rotatably mounted on the frame;

[0020] A first driving assembly, wherein the first driving assembly is used to drive the ball spline shaft assembly to rotate.

[0021] Preferably, in the above-mentioned biochemical analyzer, the limiting component includes:

[0022] A code disc, the code disc being fixedly sleeved on the ball spline shaft assembly;

[0023] A limiting stud is installed on the supporting base and is used to limit the rotation angle of the code disk.

[0024] Preferably, in the above-mentioned biochemical analyzer, the ball spline shaft assembly includes:

[0025] A key cylinder, the key cylinder being rotatably mounted on the frame around its own axis, and a first end of the key cylinder being connected to the needle arm assembly;

[0026] A key shaft is inserted into the key barrel; the key shaft can slide relative to the key barrel along its own axis.

[0027] Preferably, in the above-mentioned biochemical analyzer, the key cylinder has a flat key;

[0028] The support base also includes:

[0029] An adapter flange having a flat key mounting groove and a guide groove that are arranged in a communicating manner, wherein the flat key mounting groove and the flat key can be circumferentially limited, and the key cylinder is plugged into the adapter flange via the flat key;

[0030] A second driving component, which is used to drive the key shaft to slide relative to the key cylinder along its own axis.

[0031] Preferably, in the above biochemical analyzer, a threaded hole is provided on the end face of the second end of the adapter flange for assembling and disassembling screws to eject the key cylinder from the adapter flange.

[0032] Preferably, in the above biochemical analyzer, the support base further includes:

[0033] An outer bearing sleeve, an installation through hole is provided on the frame, and the outer bearing sleeve is fixed at the installation through hole;

[0034] A bearing, the adapter flange is rotatably installed inside the outer bearing sleeve through the bearing;

[0035] A threaded set screw, the threaded set screw is threadedly connected to the end face of the adapter flange, and the threaded set screw is used to abut against the flat key to move the flat key in the direction of the guide groove.

[0036] Preferably, in the above biochemical analyzer, the needle arm assembly includes:

[0037] A needle arm, the needle arm has an assembly through hole;

[0038] The pipetting needle, the pipetting needle is axially movably installed in the assembly through hole through a mounting seat;

[0039] A spring pressing piece, the spring pressing piece is fixed on the needle arm, and a distance for the axial movement of the mounting seat is formed between the spring pressing piece and the needle arm.

[0040] Preferably, in the above biochemical analyzer, the spring pressing piece has a circular hole and a waist-shaped hole for threaded connection with the needle arm.

[0041] Preferably, in the above biochemical analyzer, the spring pressing piece has a notch for accommodating the pipetting needle, and one side of the notch has a guiding edge for guiding the pipetting needle to enter and exit the notch.

[0042] The present invention provides a biochemical analyzer. By setting both the incubation disc and the reagent disc as two inner and outer circles, and arranging four pipetting components circumferentially on the incubation disc, and setting the rotation directions of two adjacent pipetting components to be opposite and the rotation angles to be reciprocal circumferential angles, and the adjacent pipetting components corresponding to different positions of the incubation disc and the reagent disc, it can be ensured that the four pipetting components can operate simultaneously, improving the working efficiency while ensuring the stability of the operation. Description of the Drawings

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0044] Figure 1 It is a top view structural schematic diagram of a biochemical analyzer disclosed in an embodiment of the present invention;

[0045] Figure 2 It is a top view structural schematic diagram of a liquid transfer assembly of a biochemical analyzer disclosed in an embodiment of the present invention;

[0046] Figure 3 It is a structural schematic diagram of a liquid transfer device of a biochemical analyzer disclosed in an embodiment of the present invention;

[0047] Figure 4 It is a structural schematic diagram of a support base of a biochemical analyzer disclosed in an embodiment of the present invention;

[0048] Figure 5 It is a structural schematic diagram of a support base of a first liquid transfer device of a biochemical analyzer disclosed in an embodiment of the present invention;

[0049] Figure 6 It is a structural schematic diagram of a support base of a second liquid transfer device of a biochemical analyzer disclosed in an embodiment of the present invention;

[0050] Figure 7 It is a structural schematic diagram of a support base of a third liquid transfer device of a biochemical analyzer disclosed in an embodiment of the present invention;

[0051] Figure 8 It is a structural schematic diagram of a support base of a fourth liquid transfer device of a biochemical analyzer disclosed in an embodiment of the present invention;

[0052] Figure 9 It is a partial structural schematic diagram of a support base of a biochemical analyzer disclosed in an embodiment of the present invention;

[0053] Figure 10 It is a partial structural sectional view of a support base of a biochemical analyzer disclosed in an embodiment of the present invention;

[0054] Figure 11 It is a structural schematic diagram of a needle arm assembly disclosed in an embodiment of the present invention. Specific embodiments

[0055] The present invention discloses a biochemical analyzer, which ensures the normal use of the liquid transfer device by defining the layout and angle of the liquid transfer device.

[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0057] In the current field of biochemical detection, in sampling devices such as high-speed biochemical analyzers, corresponding pipetting devices are usually equipped to meet the corresponding pipetting requirements such as sampling and sample addition, and to ensure the corresponding inspection operation requirements.

[0058] In order to improve the detection efficiency, multiple pipetting devices may be provided on a biochemical analyzer. However, the movements and working angles of these pipetting devices may interfere with each other. In view of this, a biochemical analyzer is disclosed in the present application, which limits the layout and angle of the pipetting device to ensure the normal use of the pipetting device.

[0059] As Figure 1 and Figure 2 shown, the biochemical analyzer in the present application includes: an incubation tray 2, a sample sampling needle 1, a reagent tray 3, and a pipetting assembly 4. Among them, the incubation tray 2 includes inner ring cuvettes 22 and outer ring cuvettes 21, and the reagent tray 3 includes an inner ring reagent tray 31 and an outer ring reagent tray 32.

[0060] The pipetting assembly 4 includes a first pipetting device 41, a second pipetting device 42, a third pipetting device 43, and a fourth pipetting device 44.

[0061] Among them, the incubation tray 2 includes two concentric inner and outer rings of cuvettes, and the inner ring cuvettes 22 and the outer ring cuvettes 21 are designed in groups along the circumferential direction. The above-mentioned first pipetting device 41 and third pipetting device 43 correspond to the inner ring cuvettes 22, and the above-mentioned second pipetting device 42 and fourth pipetting device 44 correspond to the outer ring cuvettes 21. That is, the second pipetting device 42 and the fourth pipetting device 44 can only add samples to the outer ring cuvettes 21, and the first pipetting device 41 and the third pipetting device 43 are preferably used to add samples to the inner ring cuvettes 22, but can also add samples to the outer ring cuvettes 21.

[0062] In order to ensure the normal rotation of the pipetting assembly, the first pipetting device 41 and the second pipetting device 42 in the present application rotate in opposite directions, and the rotation angle α1 of the first pipetting device 41 and the rotation angle α2 of the second pipetting device 42 are reciprocal circumferential angles, that is, the sum of the rotation angle α1 of the first pipetting device 41 and the rotation angle α2 of the second pipetting device 42 is 360°. Through the above settings, the first pipetting device 41 and the second pipetting device 42, the third pipetting device 43 and the fourth pipetting device 44 can move synchronously and in opposite directions.

[0063] Similarly, the third pipetting device 43 and the fourth pipetting device 44 in the present application rotate in opposite directions, and the rotation angle α3 of the third pipetting device 43 and the rotation angle α4 of the fourth pipetting device 44 are complementary angles.

[0064] In addition, the inner ring reagent tray 31 of the reagent tray 3 corresponds to the second pipetting device 42 and the fourth pipetting device 44, and the outer ring reagent tray 32 corresponds to the first pipetting device 41 and the third pipetting device 43.

[0065] The reagent tray 3 is provided with two rings and corresponds to different pipetting devices respectively, so that the sample addition process can achieve synchronous sample addition in the inner and outer rings without interference.

[0066] In the present application, by providing a reagent tray and an incubation tray that cooperate with each other in the inner and outer rings, synchronous sample addition is achieved by four pipetting devices, improving the output of test results.

[0067] The pipetting assembly in the present application includes a first pipetting device 41, a second pipetting device 42, a third pipetting device 43, and a fourth pipetting device 44. In order to reduce the types of parts and thus reduce production costs, optionally, the structures of the first pipetting device 41, the second pipetting device 42, the third pipetting device 43, and the fourth pipetting device 44 are set to the same structure. In order to ensure different rotation angles of the first pipetting device 42, the third pipetting device 43, and the fourth pipetting device 44, the difference between these four pipetting devices may only lie in the different code discs for adjusting the angles.

[0068] As Figure 3 shown, the first pipetting device 41, the second pipetting device 42, the third pipetting device 43, and the fourth pipetting device 44 in the present application all include: partial structures in the support base 300, a pipetting needle housing 100, a needle arm assembly 200, and a limiting assembly 400.

[0069] Among them, the pipetting needle housing 100 is used to cover the needle arm assembly 200 to protect the installation structure of the needle arm assembly 200 and make the appearance more concise. The pipetting needle housing 100 can be a plastic part and is detachably connected to the needle arm assembly 200 to facilitate the repair or replacement of the needle arm assembly 200.

[0070] Combined with Figure 4 it can be seen that the support base 300 of the four pipetting assemblies specifically includes: a ball spline shaft assembly 301, a rotating motion driving wheel 302, a rotating synchronous belt wheel 303, a rotating synchronous belt 304, an upper support seat 306, a rotating drive motor 307, and a connecting column 308.

[0071] Among them, the ball spline shaft assembly 301 is connected to the needle arm assembly 200, and the rotation of the needle arm assembly 200 can be achieved by driving the ball spline shaft assembly 301.

[0072] The above-mentioned rotary motion driving wheel 302, rotary synchronous belt wheel 303, rotary synchronous belt 304 and rotary driving motor 307 can be referred to as the first driving assembly. Those skilled in the art can understand that the first driving assembly can also be of other structures, as long as it can drive the ball spline shaft assembly 301 to rotate.

[0073] The connecting column 308 in this article is vertically arranged, and the upper support seat 306 is horizontally arranged on the connecting column 308. The connecting column 308 and the upper support seat 306 together form a frame for installing the ball spline shaft assembly 301. In some embodiments, the frame adopts sheet metal bending and welding processes, which are convenient to process and have low costs. Different stud mounting holes are arranged on it to realize the installation of four different pipetting devices, achieving the purpose of installing multiple pipetting devices on one frame at the same time.

[0074] The rotary motion driving wheel 302 and the rotary synchronous belt wheel 303 are installed on the upper support seat 306. The rotary motion driving wheel 302 is drivingly connected to the rotary driving motor 307. The rotary synchronous belt wheel 303 is rotationally connected to the ball spline shaft assembly 301. The rotary synchronous belt 304 is wound around the rotary motion driving wheel 302 and the rotary synchronous belt wheel 303. Under the action of the rotary driving motor 307, the rotary motion driving wheel 302 can be driven to rotate, and the rotary synchronous belt wheel 303 is driven to rotate through the rotary synchronous belt 304, thereby realizing the rotation of the ball spline shaft assembly 301.

[0075] Combined Figures 5 to 8 As shown, in order to ensure that the rotation angles of the first pipetting device 41, the second pipetting device 42, the third pipetting device 43 and the fourth pipetting device 44 in this application are different, limit assemblies 400 for limiting the rotation angle of the needle arm assembly 200 are respectively provided on the support base 300 in this application.

[0076] As Figure 5 shown, the limit assembly 400 of the first pipetting device 41 includes: a first code disc 401 and a first limit stud 402. Among them, the first code disc 401 has protrusions, and the first limit stud 402 is two and is arranged along the circumferential direction of the first code disc 401. The first code disc 401 is fixedly connected to the ball spline shaft assembly 301. When the ball spline shaft assembly 301 rotates, the first code disc 401 is driven to rotate synchronously. Under the action of the protrusions abutting against the two first limit studs 402, the first code disc 401 can only rotate between the two first limit studs 402, thereby determining the rotation angle of the first pipetting device 41.

[0077] Similarly, as Figure 6As shown, the limiting component 400 of the second pipetting device 42 includes: a second code disk 403 and two second limiting studs 404. Under the action of the two second limiting studs 404, the second code disk 403 can only rotate between the two second limiting studs 404, thereby limiting the rotation angle of the ball spline shaft assembly 301 of the second pipetting device 42 and determining the rotation angle of the second pipetting device 42.

[0078] According to the above principle, as Figure 7 shown, the limiting component 400 of the third pipetting device 43 includes: a third code disk 405 and two third limiting studs 406. Under the limitation of the two third limiting studs 406, the rotation angle of the third pipetting device 43 is determined.

[0079] According to the above principle, as Figure 8 shown, the limiting component 400 of the fourth pipetting device 44 includes: a fourth code disk 407 and two fourth limiting studs 408. Under the limitation of the two fourth limiting studs 408, the rotation angle of the fourth pipetting device 44 is determined.

[0080] It should be noted that the installation positions of the studs corresponding to the code disks in this article can be set according to the needs of different rotation angles, and all are within the protection scope.

[0081] Combined with Figure 4 、 Figure 9 and Figure 10 shown, the support base 300 of the four pipetting components in this application further includes a lifting drive motor 309, a lifting motion driving wheel 310, a lifting synchronous belt 311, a belt fixing plate 312, a lifting motion driven wheel 313, a top sleeve 314, a base 315, a transition flange 316, and a belt pressing plate 328.

[0082] It should be noted that the above-mentioned lifting drive motor 309, lifting motion driving wheel 310, lifting synchronous belt 311, belt fixing plate 312, lifting motion driven wheel 313, and belt pressing plate 328 form a second driving component. Of course, the second driving component can also be other structures, as long as the relative motion between the key shaft 3011 and the key barrel 3012 can be achieved.

[0083] The above-mentioned lifting motion driving wheel 310 and lifting motion driven wheel 313 are rotatably installed on the connecting column 308, and the lifting motion driving wheel 310 is in transmission connection with the lifting drive motor 309. The lifting synchronous belt 311 is wound around the lifting motion driving wheel 310 and the lifting motion driven wheel 313, and the lifting synchronous belt 311 is fixedly connected to the second end of the key shaft 3011 through the belt pressing plate 328.

[0084] The above-mentioned ball spline shaft assembly 301 includes a spline shaft 3011 and a spline tube 3012, and a flat key 30121 is provided on the spline tube 3012.

[0085] In the present application, the spline shaft 3011 can slide relative to the spline tube 3012 along its own axis, and the spline tube 3012 is rotatably mounted on the upper support seat 306 around its own axis, and the first end of the spline tube 3012 is used to mount the needle arm assembly 200. The needle arm assembly 200 is driven by the spline tube 3012 to rotate, so as to realize the angular change of the needle arm assembly 200.

[0086] Specifically, the outer diameter at the second end of the spline shaft 3011 is set to be smaller, and a shaft shoulder is formed at the position where the outer diameter size changes; a base 315 is sleeved at the position with the smaller outer diameter, and a top sleeve 314 is fixed. The top sleeve 314 is used to tightly press the base 315 against the above-mentioned shaft shoulder of the spline shaft 3011, so that the base 315 is fixedly connected to the spline shaft 3011. A belt fixing plate 312 is fixed on the base 315; the belt fixing plate 312 is fixedly connected to a belt pressing plate 328, and the belt pressing plate 328 is fixed on the lifting synchronous belt 311.

[0087] During operation, the lifting drive motor 309 drives the lifting motion driving wheel 310 to rotate. The lifting motion driving wheel 310 drives the lifting motion driven wheel 313 to rotate through the lifting synchronous belt 311, and the lifting synchronous belt 311 drives the spline shaft 3011 to move up and down relative to the spline tube 3012 along the axial direction of the spline shaft 3011.

[0088] In addition, the adapter flange 316 in the present application includes a flange sleeve 3161 and a flange plate 3164. Among them, the flange sleeve 3161 is of a cylindrical structure, and is provided with a flat key installation groove 3165 and a guide groove 3166. The first end of the flange plate 3161 is fixedly connected to the flange plate 3164, the second end is provided with an external thread 3162, and a threaded hole 3163 is provided on the end face.

[0089] The above-mentioned spline tube 3012 is inserted into the adapter flange 316 and is connected to the flange sleeve 3161 through a flat key 30121. The flat key 30121 is fixed on the spline tube 3012. One end of the guide groove 3166 communicates with the flat key installation groove 3165, and the other end extends to the first end of the flange sleeve 3161. The guide groove 3166 is used to guide the flat key 30121 into the flat key installation groove 3165, and the width of the guide groove 3166 is greater than the width of the flat key installation groove 3165.

[0090] By providing the guide groove, the spline tube 3012 can be conveniently inserted into the adapter flange 316 in place by a pushing method without configuring additional tooling for positioning, which is beneficial to improving the assembly efficiency.

[0091] Combined with Figure 10As shown, the threaded hole 3163 disclosed in this text is used to assemble and disassemble screws to eject the key barrel 3012 from the adapter flange 316. When the adapter flange 316 and the key barrel 3012 are disassembled from each other, the disassembly screw is screwed into the threaded hole 3163, and the screw rod of the disassembly screw extends into the threaded hole 3163 and abuts against the flat key 30121. During the movement of the screw rod, the key barrel 3012 is pushed towards the opening at the first end of the adapter flange 316, so that the key barrel 3012 is disengaged from the opening at the first end of the adapter flange 316, realizing disassembly.

[0092] It can be understood that the threaded hole 3163 in this text can be set to one, and preferably set to a plurality. Further, the plurality of threaded holes 3163 are preferably arranged evenly along the circumferential direction of the adapter flange 316.

[0093] In a further embodiment, when the ball spline shaft assembly 301 is installed on the upper support seat 306, there will be an installation error, and the installation error will generate a movement clearance of the ball spline shaft assembly 301, which affects the liquid transfer effect, and the greater the clearance, the greater the quantitative deviation, and further causes problems related to liquid splashing, affecting the test results and customer experience. In view of the above problems, a clearance elimination device is disclosed in this application. The ball spline shaft assembly 301 and the upper support seat 306 are connected through the clearance elimination device to eliminate the installation clearance between the ball spline shaft assembly 301 and the upper support seat 306.

[0094] The clearance elimination device includes: a bearing housing 305, a threaded collar 317, a bearing 326, and a set screw 327.

[0095] Specifically, the upper support seat 306 in this application has an installation through-hole, and a bearing housing 305 is fixed at the installation through-hole; a bearing 326 is installed in the bearing housing 305, and the above-mentioned adapter flange 316 is installed in the bearing 326.

[0096] In some embodiments, the inner surface of the bearing housing 305 is provided with a shoulder, and a bearing 326 is installed on each side of the shoulder along the axial direction of the bearing housing 305.

[0097] Among them, the external thread 3162 at the second end of the adapter flange 316 is used for threaded connection with the threaded collar 317; the two bearings 326 are located between the flange 3164 and the threaded collar 317. The threaded collar 317 in this text can be a spiral spring structure or a spiral gasket.

[0098] Since the bearings 326 on both sides of the shoulder are respectively pressed against the shoulder by the flange 3164 and the threaded collar 317, the clearance between the shoulder and the two bearings 326, the clearance between the flange 3164 and the adjacent bearing 326, and the clearance between the threaded collar 317 and the adjacent bearing 326 can be eliminated by setting the rotation torque of the threaded collar 317 during assembly.

[0099] The above arrangement can avoid the problem of excessive gap between the ball spline shaft assembly 301 and the upper support seat 306 .

[0100] At the same time, during assembly, the rotational torque of the threaded top sleeve 317 is set to A±0.1Nm through repeated trial and error, which ensures that the load is stable and reliable during rotation. At the same time, the setting of the rotational torque of the threaded top sleeve 317 ensures the consistency of installation.

[0101] Furthermore, in order to maintain the threaded top sleeve 317 at a set rotational torque, a top screw 327 may be assembled on the rotating fixed top sleeve. The top screw 327 is screwed into the radial threaded hole of the threaded top sleeve 317 and tightens the adapter flange 316 .

[0102] like Figure 11 As shown, the needle arm assembly 200 in the present application includes a spring pressing piece 201, a mounting screw 203, a gasket 205, a spring 206, a needle arm 208, a pipette needle 209 and a mounting seat 210.

[0103] The needle arm 208 has an assembly through hole, and the pipette needle 209 is installed in the assembly through hole of the needle arm 208 through the mounting seat 210. The spring 206 is installed between the needle arm 208 and the gasket 205 to ensure that the pipette needle 209 can move along the axial direction of the pipette needle 209.

[0104] To limit the movement of the mounting base 210, a spring pressure piece 201 is mounted on the needle arm 208. The spring pressure piece 201 includes a notch that fits within the pipette needle 209. A gasket 205 is located between the spring pressure piece 201 and the needle arm 208. The spring pressure piece 201 and the gasket 205 act in a manner that limits the upward movement of the pipette needle 209.

[0105] Due to the limitation of the gap of the spring pressing plate 201 and the pipette needle 209, the disassembly and assembly of the pipette needle 209 will be affected. Based on this, in this application, a guide edge 202 is provided on one edge of the gap. Under the action of the guide edge 202, the pipette needle 209 can be easily entered and exited from the gap.

[0106] In addition, the spring pressing piece 201 is mounted in the mounting hole 207 of the needle arm 208 via a mounting screw 203 .

[0107] The spring pressing piece 201 has a waist-shaped hole 204 and a round hole, wherein the waist-shaped hole 204 and the round hole respectively correspond to a mounting hole 207 .

[0108] Assembly process of the spring pressing piece 201: First, pre-assemble the spring pressing piece 201 in the mounting hole 207 through the kidney-shaped hole 204 using the mounting screw 203, so that the spring pressing piece 201 can move along the kidney-shaped hole 204 and rotate along the mounting screw 203 that cooperates with the kidney-shaped hole 204. After adjustment in this way, there is enough space to install the pipetting needle 209. Then, move along the kidney-shaped hole 204 and rotate around the mounting screw 203 that cooperates with the kidney-shaped hole 204 until the pipetting needle 209 enters the notch through the guiding edge 202. At this time, the gasket 205 is pressed under the spring pressing piece 201, and is fixedly installed through the round hole and another mounting screw 203.

[0109] When replacing the pipetting needle 209: Unscrew the mounting screw 203 that cooperates with the round hole on the spring pressing piece 201, and by moving along the kidney-shaped hole 204 and rotating around the mounting screw 203 that cooperates with the kidney-shaped hole 204, make the pipetting needle 209 rotate out of the notch through the guiding edge 202, avoiding the shielding of the pipetting needle 209 by the spring pressing piece 201, so as to have enough space to draw out the pipetting needle 209. In order to make the structure more compact.

[0110] It should be noted that for the convenience of description, only the parts related to the relevant invention are shown in the drawings. Without conflict, the embodiments in the present invention and the features in the existing embodiments can be combined with each other.

[0111] The above description is only the preferred embodiment of the present invention and the explanation of the applied technical principles, and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. The scope of the invention involved in the present invention is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the technical solutions formed by replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present invention.

Claims

1. A biochemical analyzer, characterized in that, Comprising: An incubation tray, the incubation tray includes an inner ring colorimetric cup and an outer ring colorimetric cup, and the inner ring colorimetric cup and the outer ring colorimetric cup are respectively arranged circumferentially; A reagent tray, the reagent tray includes an inner ring reagent tray and an outer ring reagent tray, and the inner ring reagent tray and the outer ring reagent tray are respectively arranged circumferentially; A first pipetting assembly, a second pipetting assembly, a third pipetting assembly and a fourth pipetting assembly arranged circumferentially around the incubation tray, the pipetting needles of the first pipetting assembly and the third pipetting assembly can rotate to add samples to the inner ring colorimetric cup and the outer ring reagent tray, and the pipetting needles of the second pipetting assembly and the fourth pipetting assembly can rotate to add samples to the outer ring colorimetric cup and the inner ring reagent tray; The first pipetting assembly is adjacent to the second pipetting assembly, and the first pipetting assembly and the second pipetting assembly rotate in opposite directions, and the rotation angle is a reciprocal circumferential angle; The third pipetting assembly is adjacent to the fourth pipetting assembly, and the third pipetting assembly and the fourth pipetting assembly rotate in opposite directions, and the rotation angle is a reciprocal circumferential angle; The first pipetting assembly, the second pipetting assembly, the third pipetting assembly and the fourth pipetting assembly all include: a needle arm assembly, the needle arm assembly includes a pipetting needle; a support base, the needle arm assembly is rotatably connected to the support base; a limiting assembly, the limiting assembly is used to limit the axial movement of the pipetting needle; The support base includes: a frame, a ball spline shaft assembly, one end of the ball spline shaft assembly is connected to the needle arm assembly, and the other end is rotatably installed on the frame; a first driving assembly, the first driving assembly is used to drive the ball spline shaft assembly to rotate; The limiting assembly includes: a code disk, the code disk is fixedly sleeved on the ball spline shaft assembly; a limiting stud, the limiting stud is installed on the support base and is used to limit the rotation angle of the code disk; The ball spline shaft assembly includes: a key barrel, the key barrel is rotatably installed on the frame around its own axis, and the first end of the key barrel is connected to the needle arm assembly; a key shaft, the key shaft is inserted into the key barrel; the key shaft can slide relative to the key barrel along its own axis.

2. The biochemical analyzer according to claim 1, wherein The key barrel has a flat key; The support base further includes: A transfer flange, the transfer flange has a flat key installation groove and a guide groove arranged in communication, the flat key installation groove circumferentially limits the flat key, and the key barrel is inserted into the transfer flange through the flat key; A second driving assembly, the second driving assembly is used to drive the key shaft to slide relative to the key barrel along its own axis.

3. The biochemical analyzer according to claim 2, wherein The second end face of the transfer flange is provided with a threaded hole for assembling and disassembling a screw to eject the key barrel out of the transfer flange.

4. The biochemical analyzer according to claim 2, characterized in that, The support base further includes: A bearing outer sleeve, the frame is provided with an installation through hole, and the bearing outer sleeve is fixed at the installation through hole; A bearing, the transfer flange is rotatably installed inside the bearing outer sleeve through the bearing; A threaded set screw, the threaded set screw is threadedly connected to the end face of the transfer flange, and the threaded set screw is used to abut against the flat key to move the flat key towards the direction of the guide groove.

5. The biochemical analyzer according to any one of claims 1 to 4, characterized in that The needle arm assembly includes: A needle arm having an assembly through-hole; The pipetting needle is axially movably mounted in the assembly through-hole through a mounting seat; A spring piece is fixed to the needle arm, and a distance for the axial movement of the mounting seat is formed between the spring piece and the needle arm.

6. The biochemical analyzer according to claim 5, characterized in that, The spring piece has a circular hole and a waist-shaped hole for threaded connection with the needle arm.

7. The biochemical analyzer according to claim 5, wherein The spring piece has a notch for accommodating the pipetting needle, and one side of the notch has a guiding edge for guiding the pipetting needle to enter and exit the notch.

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