Stirring arm and automatic analysis device

Abstract

According to the stirring arm and the automatic analysis device, the automatic analysis device is provided with the stirring arm, the stirring arm is provided with the stirring unit, the moving unit, the fixing unit, the guide mechanism and the controller, the stirring unit is fixedly connected to the moving unit, and the fixing unit generates two magnetic fields which are crossed with each other; the moving unit is driven by the magnetic fields to move along a vertical plane under the constraint of the guide mechanism, and the controller is used for conveying current with controllable magnitude to the fixed unit so as to adjust the magnitude of the two magnetic fields, so that the position and the moving speed of the moving unit are controlled. According to the implementation mode, the moving unit is only driven by magnetic force generated by two mutually crossed magnetic fields, so that the stirring unit is moved by a specified horizontal distance and a specified vertical distance, and noise, loss and vibration caused by using mechanical transmission parts such as a lead screw are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to stirring arm.

[0002] The utility model relates to automatic analysis device. BACKGROUND

[0003] The existing specimen device, such as the automatic analysis device disclosed by CN112730277A, needs to perform horizontal movement along the X axis and vertical movement along the Y axis using the stirring unit, in order to realize horizontal and vertical movement, the specimen device usually includes two sets of transmission systems for driving the stirring unit to move, for example, the two-dimensional arm automatic sample adding device disclosed by CN209513827U, which adopts synchronous belt sliding table and screw sliding table to drive the stirring unit to move horizontally and vertically.

[0004] The cost of the two sets of transmission systems is relatively high, and each set of transmission system has more parts, which has the following disadvantages: there is an assembly gap between the screw, guide groove, gear and rack, which will cause the parts to vibrate when moving, and the insufficient rigidity of each part will cause the deformation of the parts, resulting in a large vibration of the stirring unit when moving; the parts such as screw, guide groove, gear and rack are easy to wear, these wearing parts will gradually wear out with use, resulting in the movement accuracy of the stirring unit getting worse and worse, and the vibration during operation also increases. SUMMARY

[0005] The utility model aims at providing stirring arm and automatic analysis device, its use changes the magnetic force that size and direction change generates magnetic field change and drives stirring unit to move the horizontal distance and vertical distance of stipulation, thereby cancelled the wearing parts such as screw, gear and the like that influence the movement accuracy and movement vibration of stirring unit.

[0006] To solve the above technical problems, the stirring arm provided by the utility model has a stirring unit for stirring samples and reagents; a movement unit fixedly connected to the stirring unit and capable of being driven by a magnetic field to move on a vertical plane; a fixed unit having a first magnetic field generating unit with a magnetic field direction along a first direction and a second magnetic field generating unit with a magnetic field direction along a second direction, the first direction and the second direction intersecting each other and both being located on the vertical plane on which the movement unit moves, the movement unit being located at least in the action range of the magnetic field generated by one of the first magnetic field generating unit and the second magnetic field generating unit; a guide mechanism having a first guide slot and a second guide slot, the first guide slot being fixedly connected to a rack, the first guide slot being parallel to the first direction, the second guide slot being movably connected to the first guide slot, the second guide slot being parallel to the second direction, and the stirring unit being movably connected to the second guide slot; and a controller for delivering a current with a controllable size to the first magnetic field generating unit and the second magnetic field generating unit to adjust the size and direction of the magnetic field, thereby controlling the position and moving speed of the movement unit.

[0007] The utility model also provides an automatic analysis device with the stirring arm.

[0008] According to the above embodiment, the magnetic field generated by the first magnetic field generating unit and the second magnetic field generating unit drives the movement unit to move, the guide mechanism restricts the movement unit to move only on a vertical plane, and the controller adjusts the size of the current generating the magnetic field to change the size and direction of the magnetic force, thereby making the movement unit drive the stirring unit to move a specified horizontal distance and vertical distance. This embodiment cancels the wear parts such as lead screws and gears that affect the moving precision and movement vibration of the stirring unit, thereby improving the moving precision of the stirring unit, reducing the movement vibration of the stirring unit, and reducing the overall volume and production cost of the stirring arm. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a schematic view of the connection relationship of the movement unit and the fixed unit of the first embodiment of the utility model;

[0010] Figure 2 It is a schematic view of the connection relationship of the guide mechanism of the first embodiment of the utility model;

[0011] Figure 3 It is a schematic view of the connection relationship of the first guide slot and the first guide roller of the first embodiment of the utility model;

[0012] Figure 4 It is a structural schematic view of the first magnetic field generating unit of the first embodiment of the utility model;

[0013] Figure 5The second embodiment of the utility model is a structural schematic view. DETAILED DESCRIPTION

[0014] The utility model is described below according to the embodiment shown in the drawings. The embodiment disclosed this time can be considered as illustrative in all aspects, and not restrictive. The scope of the utility model is not limited by the description of the embodiment, but is only shown by the scope of the claims, and includes all modifications within the scope of the claims and with the same meaning as the claims.

[0015] To solve the problem of large movement vibration and poor movement precision of the transmission system used by the existing stirring unit, a stirring arm is provided below.

[0016] (First embodiment)

[0017] Figure 1 And Figure 2 It is a structural schematic view of the first embodiment of the stirring arm, combined with Figure 1 、 Figure 2 .

[0018] The stirring arm has:

[0019] A stirring unit 1 for stirring samples and reagents;

[0020] A movement unit 2 fixedly connected to the stirring unit 1 and capable of being driven by a magnetic field to move in a vertical plane;

[0021] A fixed unit 3 having a first magnetic field generating unit 31 with a magnetic field direction along a first direction, and a second magnetic field generating unit 32 with a magnetic field direction along a second direction, the first direction and the second direction intersecting each other and both located in the same vertical plane, and the movement unit 2 is located at least in the action range of the magnetic field generated by one first magnetic field generating unit 31 and one second magnetic field generating unit 32;

[0022] A controller for delivering a controllable current to the first magnetic field generating unit 31 and the second magnetic field generating unit 32 to adjust the size and direction of the magnetic field, so as to control the position and moving speed of the movement unit 2. Figure 1 Three different structures of the movement unit 2 and the fixed unit 3 are shown, Figure 1 The hollow arrow in indicates the direction of the magnetic field, Figure 1 The solid arrow in indicates the movement trajectory of the movement unit 2.

[0023] The first direction is preferably vertical (gravity) direction, and the second direction is preferably horizontal direction.

[0024] Figure 1(A) The fixed unit 3 shown includes a plurality of second magnetic field generating units 32 arranged in a vertical direction, and a plurality of first magnetic field generating units 31 arranged in a rectangular array in a horizontal direction and a vertical direction, and the movement unit 2 is a horizontally placed long strip shape, so that the movement unit 2 can cover at least one first magnetic field generating unit 31 and one second magnetic field generating unit 32.

[0025] Figure 1 (B) The fixed unit 3 shown includes a plurality of second magnetic field generating units 32 arranged in a horizontal direction, and a plurality of first magnetic field generating units 31 arranged in a rectangular array in a horizontal direction and a vertical direction, and the movement unit 2 is a vertically placed long strip shape, so that the movement unit 2 can cover at least one first magnetic field generating unit 31 and one second magnetic field generating unit 32.

[0026] Figure 1 (C) The fixed unit 3 shown includes a plurality of first magnetic field generating units 31 and a plurality of second magnetic field generating units 32 arranged in a staggered manner in a horizontal direction and a vertical direction and eventually forming a rectangular array, and the movement unit 2 is a square shape, so that the movement unit 2 can cover at least one first magnetic field generating unit 31 and one second magnetic field generating unit 32.

[0027] Figure 1 The three movement units 2 shown are in any case a whole, and do not need to be split into two or more parts.

[0028] Figure 1 The three fixed units 3 shown do not need to be moved in any case.

[0029] In an extreme case, for example, when the stirring unit 1 needs to be moved only a small distance, and the volumes of the first magnetic field generating units 31 and the second magnetic field generating units 32 are large, the movement unit 2 can be moved only a small distance by one first magnetic field generating unit 31 and one second magnetic field generating unit 32, and therefore, the minimum number of first magnetic field generating units 31 and second magnetic field generating units 32 possessed by the fixed unit 3 is one.

[0030] It should also be noted that:

[0031] The first direction and the second direction only need to have an included angle, and the included angle between them does not need to be 90°, and the movement unit 2 can also be moved in a vertical plane, and when the included angle between them is 90°, the movement range of the movement unit 2 is the largest.

[0032] The first direction and the second direction can be inclined, and even if the movement unit 2 moves in an inclined direction, the purpose of moving a specified distance in the horizontal and vertical directions can also be achieved.

[0033] On the other hand, since the fixed unit 3 can provide magnetic field in two directions, the two degrees of freedom of the stirring unit 1 can be limited, however, the stirring unit 1 still has four degrees of freedom in the air, in order to make the stirring unit 1 move in the direction that people want, the stirring arm still has a guide mechanism to restrict the moving direction and moving posture of the stirring unit 1.

[0034] Figure 2 The connection relationship between the guide structure and the stirring unit 1 is shown, combined with Figure 2 .

[0035] The guide mechanism includes a first guide slot 41 and a second guide slot 42, the first guide slot 41 is fixedly connected to the rack, the rack is not shown in the figure, the second guide slot 42 is perpendicular to and movably connected to the first guide slot 41, and the stirring unit 1 is movably connected to the second guide slot 42.

[0036] One of the first guide slot 41 and the second guide slot 42 is vertical, and the other is horizontal.

[0037] Further, in order to increase the structural strength of the guide mechanism, the number of the first guide slot 41 and / or the second guide slot 42 can also be appropriately increased, for example, combined with Figure 2 , two vertical first guide slots 41 are used to connect a horizontal second guide slot 42, the top ends of the two first guide slots 41 are fixedly connected through a cross beam 45, and the bottom ends of the two first guide slots 41 are connected to the rack through support columns 46.

[0038] Further, in order to reduce the vibration when the second guide slot 42 and the stirring unit 1 move, the second guide slot 42 is connected with a first guide roller 43 which can roll on the first guide slot 41, and the stirring unit 1 is connected with a second guide roller 44 which can roll on the second guide slot 42.

[0039] Figure 3 A connection mode of the first guide slot 41 and the first guide roller 43 is shown, combined with Figure 3 .

[0040] The first guide roller 43 and the second guide roller 44 can adopt the shape of a wheel body or a sphere, and the cross section of the first guide slot 41 and the second guide slot 42 is C-shaped or U-shaped, and the first guide roller 43 and the second guide roller 44 are respectively clamped on the inner side or the outer side of the first guide slot 41 and the second guide slot 42.

[0041] The stirring unit 1 usually has a motor and a stirring rod, and the moving unit 2 usually has one of iron, magnet and excitation coil built-in, so that the moving unit 2 can be driven by the magnetic field.

[0042] The first magnetic field generating unit 31 and the second magnetic field generating unit 32 are different in direction but the same in structure, Figure 4The structure of the first magnetic field generating unit 31 is shown, combined with Figure 4 .

[0043] The first magnetic field generating unit 31 has at least one field coil 33, and when the number of field coils 33 is more than one, the field coils 33 are arranged in series along the magnetic field direction of the first magnetic field generating unit 31.

[0044] The first magnetic field generating unit 31 can also have permanent magnets 34, and the permanent magnets 34 are arranged alternately in a certain polarity (such as N-S-N-S) along the magnetic field direction of the first magnetic field generating unit 31.

[0045] Among them, the permanent magnets 34 are located on the side of the field coil 33 facing the moving unit 2, and the controller changes the current through the field coil 33 to form multiple stable magnetic fields between adjacent two permanent magnets 34, so that the magnetic force of the first magnetic field generating unit 31 attracting the first mover 21 changes slightly, thereby realizing micro-distance movement.

[0046] Compared with the prior art, the first embodiment avoids using mechanical transmission parts such as lead screws, has no mechanical friction, greatly reduces the noise during movement, and at the same time avoids the movement lag phenomenon caused by the elastic deformation, friction and wear and reverse clearance of the intermediate transmission link during the start, change and reversal of the moving unit 2, reduces the response time constant, improves the dynamic response performance, and at the same time improves the transmission stiffness of the stirring arm, eliminates the transmission error and tracking error caused by the mechanical transmission parts such as lead screws, and because there is no influence of the inertia and resistance moment of the intermediate transmission mechanism, the acceleration and deceleration time of the moving unit 2 is short, the fast start and positive direction operation can be realized, the positioning accuracy can be improved through linear position detection feedback control, and the overall volume of the first embodiment is about 30% of the prior art, and the estimated cost is reduced by 50%.

[0047] (Second embodiment)

[0048] Compared with the first embodiment, the moving unit 2 and the fixed unit 3 of the second embodiment are split from one whole into two or more parts, so that the moving unit 2 can move remotely, and at the same time the number of first magnetic field generating units 31 and second magnetic field generating units 32 used by the fixed unit 3 is less.

[0049] Figure 5 is a structural schematic diagram of the second embodiment of the stirring arm, combined with Figure 5 .

[0050] The first guide groove 41 is vertical, the first magnetic field generating unit 31 is fixedly connected to the first guide groove 41, the second guide groove 42 is horizontal, the second magnetic field generating unit 32 is fixedly connected to the second guide groove 42, the first mover 21 is fixedly connected to the second guide groove 42, the second mover 22 is movably connected to the second guide groove 42, the first mover 21 is located in the range of action of the magnetic field generated by the first magnetic field generating unit 31, and the second mover 22 is located in the range of action of the magnetic field generated by the second magnetic field generating unit 32, so that the first mover 21 and the second mover 22 can move along the first direction and the second direction respectively.

[0051] In the second embodiment, the first mover 21 , the second magnetic field generating unit 32 and the second guide slot 42 move synchronously, thereby eliminating the need to arrange a row of second magnetic field generating units 32 in the vertical direction, thereby reducing the number of second magnetic field generating units 32 required.

[0052] Furthermore, in order to avoid mutual interference between the magnetic fields generated by the first magnetic field generating unit 31 and the second magnetic field generating unit 32 , the first magnetic field generating unit 31 and the second magnetic field generating unit 32 never overlap on the vertical plane of movement of the moving unit 2 .

[0053] by Figure 5 Taking the structure shown as an example, the two ends of the second guide groove 42 are connected to the two first guide grooves 41, and the first magnetic field generating unit 31 is arranged at the connecting portion or overlapping portion of the first guide groove 41 and the second guide groove 42. However, the second magnetic field generating unit 32 is not arranged at the connecting portion or overlapping portion of the first guide groove 41 and the second guide groove 42, thereby avoiding mutual interference between the magnetic fields generated by the first magnetic field generating unit 31 and the second magnetic field generating unit 32 distributed on the first guide groove 41 and the second guide groove 42.

[0054] In the second embodiment, the first mover 21, the first magnetic field generating unit 31 and the first guide slot 41 are combined into an ironless linear motor, and the second mover 22, the second magnetic field generating unit 32 and the second guide slot 42 are combined into another ironless linear motor. The ironless linear motor can be replaced by an ironcore linear motor or a slotless linear motor, which can also achieve the same function.

[0055] The stirring arms disclosed in the first and second embodiments can be applied to an automatic analysis device, thereby obtaining a smaller and lower-cost automatic analysis device. The automatic analysis device includes a sample dispensing arm, a reagent dispensing arm, a photometric unit, and a reagent reservoir. The specific structure of the automatic analysis device has been disclosed in the prior art and will not be repeated herein.

[0056] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

[0057] It is to be understood that the application is not limited to the precise structures hereinabove described and shown in the drawings, for the application can vary in certain respects without departing from the scope of the application. The application is limited only as defined in the following claims.

Claims

1. A stirring arm, characterized in that, have: A stirring unit, used to stir samples and reagents; a motion unit, fixedly connected to the stirring unit and capable of being driven by a magnetic field to move in a vertical plane; The fixed unit includes a first magnetic field generating unit having a magnetic field direction along a first direction, and a second magnetic field generating unit having a magnetic field direction along a second direction, wherein the first direction and the second direction intersect each other and are both located in a vertical plane in which the moving unit moves, and the moving unit is located within the effective range of the magnetic fields generated by at least one of the first magnetic field generating unit and the second magnetic field generating unit; The guide mechanism comprises a first guide groove and a second guide groove, wherein the first guide groove is fixedly connected to the frame and parallel to the first direction, the second guide groove is movably connected to the first guide groove and parallel to the second direction, and the stirring unit is movably connected to the second guide groove; The controller is used to deliver a controllable current to the first magnetic field generating unit and the second magnetic field generating unit to adjust the size and direction of the magnetic field, thereby controlling the position and moving speed of the motion unit.

2. The stirring arm according to claim 1, characterized in that The first direction is a vertical direction, and the second direction is a horizontal direction.

3. The stirring arm according to claim 2, characterized in that There are two first guide grooves and one second guide groove. The two ends of the second guide groove are movably connected to the two first guide grooves respectively. The top ends of the two first guide grooves are fixedly connected by a crossbeam, and the bottom ends of the two first guide grooves are connected to the frame through a support column.

4. The stirring arm according to claim 2, characterized in that The second guide groove is connected to a first guide roller capable of rolling on the first guide groove, and the stirring unit is connected to a second guide roller capable of rolling on the second guide groove.

5. The stirring arm according to any one of claims 1 to 4, characterized in that The first magnetic field generating unit is fixedly connected to the first guide groove, and the second magnetic field generating unit is fixedly connected to the second guide groove. The motion unit includes a first mover and a second mover. The first mover is fixedly connected to the second guide groove, and the second mover is movably connected to the second guide groove. The first mover is located within the range of action of the magnetic field generated by the first magnetic field generating unit, and the second mover is located within the range of action of the magnetic field generated by the second magnetic field generating unit.

6. The stirring arm according to claim 5, characterized in that The first magnetic field generating unit and the second magnetic field generating unit never overlap on the vertical plane where the moving unit moves.

7. The stirring arm according to claim 1, characterized in that The first magnetic field generating unit and the second magnetic field generating unit each include at least one exciting coil.

8. The stirring arm according to claim 7, characterized in that When the number of the excitation coils is greater than one, the multiple excitation coils are arranged continuously along the direction of the magnetic field.

9. The stirring arm according to claim 7 or 8, characterized in that The magnetic field generating unit further comprises a plurality of permanent magnets arranged alternately in a certain polarity along the direction of the magnetic field, and the permanent magnets are located on the side of the excitation coil facing the movement unit.

10. The stirring arm according to claim 1, wherein The movement unit comprises one of iron, a permanent magnet and an excitation coil.

11. An automatic analysis device, characterized by comprising the stirring arm according to any one of claims 1-10.

11. An automatic analysis device, characterized by comprising the stirring arm according to any one of claims 1-10.

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