Pipetting needle, pipetting module and full-automatic chemiluminescence tester

Abstract

The utility model discloses a pipetting needle, pipetting module and full-automatic chemiluminiscence determinator, the pipetting needle includes base cylinder, tip and piston unit, base cylinder and tip detachable connection, the piston unit is arranged on base cylinder in reciprocating sliding, and the piston unit is used for the tip to suck and discharge liquid and the tip is withdrawn. The pipetting module comprises the pipetting needle. The full-automatic chemiluminescence tester comprises the pipetting module. The piston unit is arranged on the base cylinder in a reciprocating sliding mode, negative pressure or positive pressure is formed in the base cylinder in the reciprocating sliding process of the piston unit, liquid is sucked into the suction head through the negative pressure, the liquid is discharged out of the suction head through the positive pressure, and the function of sucking and discharging the liquid is achieved. Meanwhile, the piston unit slides for a certain distance on the base cylinder, the suction head is pushed through displacement of the piston unit, and therefore suction head withdrawing operation is achieved. On the basis, the air pump is replaced, the air pump and related air pipes are not needed, a suction head withdrawing structure is also not needed, the cost is effectively reduced, and occupied space is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pipette needles, in particular to a pipette needle, a pipette module and a full-automatic chemiluminescence measuring instrument. Background Art

[0002] The fully automatic chemiluminescence analyzer is a device used for immunoassays, which is used for the detection and analysis of various antigens, haptens, antibodies, hormones, enzymes, fatty acids, vitamins and drugs.

[0003] In existing fully automatic chemiluminescence analyzers, the pipette needle is connected to an air pump, which is used to pump liquid. The above technical solution has the following problems:

[0004] First, a separate air pump is more expensive and takes up more space;

[0005] Secondly, the air pump is connected to the pipette needle through the air tube. During the movement of the pipette needle, the air tube is easily entangled and pinched, causing air supply fluctuations and affecting pipetting accuracy.

[0006] Third, the pipette needle needs to be equipped with an additional and reusable suction head structure when in use. The pipette needle needs to be moved to a designated location for fixed-point suction head removal each time, which increases costs and occupies space. Utility Model Content

[0007] The technical problem to be solved by the present invention is that in the existing fully automatic chemiluminescence analyzer, the pipette needle requires additional equipment to achieve liquid aspiration, discharge and tip removal. The purpose is to provide a pipette needle, a pipetting module and a fully automatic chemiluminescence analyzer to solve the above problem.

[0008] The utility model is achieved through the following technical solutions:

[0009] In the first aspect, the utility model provides a pipette needle, comprising a base cylinder, a suction head and a piston unit. The base cylinder and the suction head are detachably connected, and the piston unit is reciprocatingly slidably arranged on the base cylinder. The piston unit is used for the suction head to suck and discharge liquid and to withdraw the suction head.

[0010] In one possible design, the base cylinder is constructed as a cylindrical structure with open ends. One end of the base cylinder is connected to the piston unit, and the other end of the base cylinder is provided with a gourd head. The gourd head is plugged into the base cylinder and extends outward. The suction head is detachably connected to the protruding end of the gourd head, and the gourd head is provided with an intermediate hole for connecting the base cylinder and the suction head.

[0011] In one possible design, the gourd head is in the shape of a shaft, and the two ends of the gourd head are respectively constructed as a first connecting end adapted to the base tube and a second connecting end adapted to the suction head. The first connecting end is connected to the base tube through a sealing ring, and the second connecting end is constructed as an enlarged head.

[0012] In one possible design, the piston unit includes a piston rod, a guide shaft, and a suction head push plate;

[0013] The piston rod is installed on the base tube and can slide back and forth along the base tube, and the piston rod is arranged opposite to the gourd head. Accordingly, one end of the base tube is closed by the piston rod, and the other end is connected to the outside world through the middle hole on the gourd head.

[0014] The guide shaft is passed through the base cylinder and is parallel to the axis of the base cylinder. The two ends of the guide shaft are respectively connected to the piston rod and the suction head push plate. Correspondingly, the base cylinder is provided with a mounting hole adapted for the guide shaft.

[0015] The suction head pushing plate is sleeved on the gourd head and can slide back and forth along the gourd head.

[0016] In one possible design, a baffle is provided on the piston rod, and the suction head push plate includes a suction withdrawal portion sleeved on the gourd head and a baffle portion connected to the suction withdrawal portion, and both ends of the guide shaft are detachably connected to the baffle and the baffle portion by screws;

[0017] At least two guide shafts are provided and evenly distributed on the base cylinder, and each guide shaft is sleeved with a spring, which is located in the mounting hole.

[0018] In the second aspect, the utility model provides a pipetting module, including a three-axis module and the pipetting needle. The three-axis module includes an X-axis module, a Y-axis module and a Z-axis module connected in sequence. The Z-axis module is connected to the pipetting needle through an additional plate, and the additional plate is provided with a driver for driving the piston rod to slide back and forth along the base cylinder.

[0019] In a possible design, a controller and a position monitor are also included. The controller is electrically connected to the three-axis module, the driver and the position monitor. The position monitor is used to monitor the position of the piston rod.

[0020] In one possible design, the position monitor includes at least one photoelectric sensor, which is arranged on the additional plate or the base cylinder, with the working end of the photoelectric sensor facing the piston rod. Accordingly, the baffle is a photoelectric baffle adapted to the photoelectric sensor.

[0021] In one possible design, position sensors are respectively provided on the X-axis module, the Y-axis module, and the Z-axis module.

[0022] In a third aspect, the present invention provides a fully automatic chemiluminescence analyzer, comprising the aforementioned pipetting module.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] The piston unit is arranged on the base cylinder for reciprocating sliding. During the reciprocating sliding process of the piston unit, negative pressure or positive pressure is formed in the base cylinder. The negative pressure causes the liquid to be sucked into the suction head, and the positive pressure causes the liquid to be discharged from the suction head, thereby realizing the function of sucking and discharging liquid.

[0025] At the same time, the piston unit will slide a certain distance on the base cylinder, and the displacement of the piston unit will be used to push the suction head, thereby realizing the suction head retraction operation.

[0026] Based on this, the air pump is replaced, and there is no need for an air pump and related air pipes, nor is there a need for a suction head ejection structure, which effectively reduces costs and space occupancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0028] Figure 1 A schematic diagram of the structure of a pipetting module.

[0029] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure.

[0030] Markings and corresponding parts names in the accompanying drawings:

[0031] 1. Base cylinder; 2. Suction head; 3. Piston unit; 31. Piston rod; 32. Guide shaft; 33. Suction head push plate; 301. Baffle; 302. Spring; 303. Suction retraction unit; 304. Baffle unit; 4. Hoist head; 5. Three-axis module; 51. X-axis module; 52. Y-axis module; 53. Z-axis module; 6. Additional board; 7. Driver; 8. Position monitor. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0033] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0034] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout this specification do not necessarily refer to the same embodiment or example. In addition, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or subcombination. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] In the description of the present invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0036] Example 1:

[0037] Aiming at the shortcomings of the prior art, the structure of the pipette needle is improved and the pipette needle is proposed, specifically: Figure 1 and Figure 2 As shown, a pipette needle includes a base cylinder 1, a suction head 2 and a piston unit 3. The base cylinder 1 and the suction head 2 are detachably connected, and the piston unit 3 is reciprocatingly slidably arranged on the base cylinder 1. The piston unit 3 is used for the suction head 2 to suck and discharge liquid and to withdraw the suction head 2.

[0038] In the pipette needle, the functions of sucking and discharging liquid and withdrawing the suction tip 2 are achieved by the piston unit 3, that is, the piston unit 3 is slidably set on the base tube 1. The volume of the base tube 1 will change during the reciprocating sliding of the piston unit 3. When the suction tip 2 is inserted below the liquid surface, the base tube 1 cannot exchange gas with the outside world through the suction tip 2. The reciprocating sliding of the piston unit 3 will form a negative pressure or positive pressure in the base tube 1. The negative pressure causes the liquid to be sucked into the suction tip 2, and the positive pressure causes the liquid to be discharged from the suction tip 2. Based on this, the function of sucking and discharging liquid is achieved by the reciprocating sliding of the piston unit 3. Accordingly, the air pump is replaced, and there is no need for an air pump and related air pipes, which effectively reduces costs and space occupancy, and there is no need to worry about accuracy problems caused by the clamping of the air pipe.

[0039] As is easy to understand, the piston unit 3 is reciprocatingly slidable on the base cylinder 1. That is, the piston unit 3 slides a certain distance on the base cylinder 1, and the displacement of the piston unit 3 pushes the suction head 2, thereby performing the suction head 2 ejection operation. Based on this, the suction head 2 ejection structure is replaced, effectively reducing costs and space usage.

[0040] Furthermore, because the suction and discharge of liquid and the removal of the suction head 2 are independent and uncoupled, the sliding area of ​​the piston unit 3 on the base cylinder 1 is divided into two or three sections: one for suction and discharge of liquid, the other for removal of the suction head 2, and a transition section if necessary. This physical restriction prevents the piston unit 3 from removing the suction head 2 during suction and discharge, ensuring smooth testing.

[0041] In one possible implementation, the base cylinder 1 is constructed as a cylindrical structure with both ends open. One end of the base cylinder 1 is connected to the piston unit 3, and the other end of the base cylinder 1 is provided with a gourd head 4. The gourd head 4 is inserted into the base cylinder 1 and extends outward. The suction head 2 is detachably connected to the protruding end of the gourd head 4, and the gourd head 4 is provided with an intermediate hole for connecting the base cylinder 1 and the suction head 2.

[0042] Based on the above design, the base cylinder 1 is connected to the piston unit 3 and the gourd head 4 through an open structure. The gourd head 4 is used to connect to the suction head 2. As can be easily understood, the diameter of at least the extended end of the gourd head 4 is adapted to the suction head 2 to achieve the connection between the gourd head 4 and the suction head 2. The gourd head 4 is connected through the middle hole to ensure that the air pressure change caused by the sliding of the piston unit 3 can be transmitted to the suction head 2, thereby achieving the function of sucking and discharging liquid.

[0043] When the extended end of the gourd head 4 is inserted into the suction head 2, the two are connected by friction. Preferably, the diameter of the extended end of the gourd head 4 is slightly larger than the inner diameter of the suction head 2. This allows the suction head 2 to deform and clamp the gourd head 4 when connected, improving the stability of the connection. Generally, the diameter of the extended end of the gourd head 4 is at least 2 mm larger than the inner diameter of the suction head 2. The specific value can be selected by those skilled in the art based on actual conditions.

[0044] As for the sealing ring, any suitable existing model can be selected.

[0045] In one possible implementation, the gourd head 4 is in the shape of a shaft, and the two ends of the gourd head 4 are respectively constructed as a first connecting end adapted to the base tube 1 and a second connecting end adapted to the suction head 2. The first connecting end is connected to the base tube 1 through a sealing ring, and the second connecting end is constructed as an enlarged head.

[0046] Based on the above design, the first connecting end is connected and sealed by a sealing ring to avoid gaps that affect the operation of the piston unit 3. The second connecting end is connected to the suction head 2 via an enlarged head. The enlarged head achieves connection and local enlargement to avoid an increase in the overall diameter of the gourd head 4. It is easy to understand that the enlarged head can be constructed in any suitable shape.

[0047] In a possible implementation, the piston unit 3 includes a piston rod 31, a guide shaft 32 and a suction head push plate 33;

[0048] The piston rod 31 is provided on the base cylinder 1 and can slide back and forth along the base cylinder 1, and the piston rod 31 is arranged opposite to the gourd head 4. Accordingly, one end of the two ends of the base cylinder 1 is closed by the piston rod 31, and the other end is connected to the outside world through the middle hole on the gourd head 4;

[0049] The guide shaft 32 is provided on the base cylinder 1 and is parallel to the axis of the base cylinder 1. The two ends of the guide shaft 32 are respectively connected to the piston rod 31 and the suction head push plate 33. Accordingly, the base cylinder 1 is provided with a mounting hole adapted for the guide shaft 32.

[0050] The suction head push plate 33 is sleeved on the gourd head 4 and can slide back and forth along the gourd head 4.

[0051] Based on the above design scheme, the piston rod 31 is set on the base cylinder 1 for reciprocating sliding. The sliding of the piston rod 31 will cause the volume of the base cylinder 1 to change, specifically, the volume of the part from the suction head 2 to the end face of the piston rod 31 changes. When the suction head 2 is inserted below the liquid surface, the gas in the base cylinder 1 is blocked by the liquid and cannot be discharged. The reciprocating sliding of the piston rod 31 will form negative pressure or positive pressure, thereby sucking and discharging the liquid.

[0052] The piston rod 31 performs the aspiration and discharge operations, but it is positioned opposite the pipette tip 2 and, due to the obstruction of the gourd head 4, prevents the piston rod 31 from directly contacting the pipette tip 2. Therefore, to facilitate the removal of the pipette tip 2, the piston unit 3 also includes a guide shaft 32 and a pipette tip push plate 33. The pipette tip push plate 33 is mounted on the gourd head 4. This reduces the distance from the pipette tip 2, helping to reduce the size of the pipette needle. Furthermore, it is positioned on the same side as the pipette tip 2 to facilitate contact and propel the pipette tip 2. The guide shaft 32 connects the piston rod 31 and the pipette tip push plate 33, thereby achieving a coordinated movement between the piston rod 31 and the pipette tip push plate 33, allowing the pipette tip push plate 33 to move with the piston rod 31, thereby removing the pipette tip 2.

[0053] It is easy to understand that the piston rod 31 is connected to the base cylinder 1 through a sealing ring. Based on this, a sliding seal is achieved through the sealing ring to ensure that the piston rod 31 can slide and avoid the occurrence of gaps.

[0054] Optionally, the piston rod 31 is equipped with a baffle 301. The suction head push plate 33 includes a suction withdrawal portion 303 that fits over the gourd head 4 and a baffle portion 304 connected to the suction withdrawal portion 303. The ends of the guide shaft 32 are detachably connected to the baffle 301 and baffle portion 304 via screws. Based on this design, the piston rod 31 is expanded by the baffle 301, thereby facilitating connection to the guide shaft 32. Similarly, the suction head push plate 33 is connected to the guide shaft 32 via the baffle portion 304. The guide shaft 32 is connected via a detachable connection, facilitating assembly and disassembly, and also facilitating subsequent inspection and maintenance.

[0055] Optionally, at least two guide shafts 32 are provided and evenly distributed on the base cylinder 1, and each guide shaft 32 is sleeved with a spring 302, which is located within the mounting hole. Based on this design, the multiple guide shafts 32 cooperate with each other to synchronize the movement of the tip pusher 33, preventing skew and jamming during movement and ensuring smooth movement of the tip pusher 33. The spring 302 is used to reset the guide shafts 32, allowing the piston unit 3 to automatically reset after completing the relevant operation, thereby improving the automation level of the pipette needle.

[0056] Example 2:

[0057] This embodiment introduces a pipetting module based on embodiment 1. Figure 1 and Figure 2 As shown, the pipetting module includes a three-axis module 5 and the pipetting needle. The three-axis module 5 includes an X-axis module 51, a Y-axis module 52 and a Z-axis module 53 connected in sequence. The Z-axis module 53 is connected to the pipetting needle through an additional plate 6. The additional plate 6 is provided with a driver 7 for driving the piston rod 31 to slide back and forth along the base cylinder 1.

[0058] For the pipetting module, the movement of the pipetting needle is achieved through the three-axis module 5, so that the pipetting needle is moved to the desired location, thereby performing operations such as sucking and discharging liquid, retracting the suction head 2, and loading the suction head 2, thereby realizing fully automatic operation; the three-axis module 5 includes an X-axis module 51, a Y-axis module 52 and a Z-axis module 53. When the pipetting needle is moved, at least one of the X-axis module 51, the Y-axis module 52 and the Z-axis module 53 starts and moves the pipetting needle.

[0059] Furthermore, the driver 7 is used to provide power and drive the piston rod 31 to slide, avoiding manual operation, reducing manual participation, and helping to improve the automation level and operation accuracy of the pipetting module. Optionally, the driver 7 can be a screw motor or any other suitable existing motor.

[0060] In a possible implementation, a controller and a position monitor 8 are further included. The controller is electrically connected to the three-axis module 5 , the driver 7 and the position monitor 8 . The position monitor 8 is used to monitor the position of the piston rod 31 .

[0061] Based on the above design, the controller is used to coordinate the actions of the various components in the control module, realize linkage and complete related operations, and help realize automated operations. It is easy to understand that the controller can be selected from any suitable existing model.

[0062] In combination with Example 1, it can be seen that the pipetting has requirements for the sliding area of ​​the piston unit 3, that is, the sliding area on the base cylinder 1 of the piston unit 3 is segmented. Figure 2 For further explanation, the area near the upper end of the base tube 1 is used for the operation of withdrawing the suction head 2, and the area above the area is used for the operation of sucking and discharging liquid. In order to improve the accuracy of the operation, the position of the piston rod 31 is monitored by the position monitor 8; at the same time, status information can also be transmitted through the position monitor 8, such as taking out the suction head 2, withdrawing the suction head 2, etc., to facilitate the staff to grasp the real-time work information.

[0063] Optionally, the position monitor 8 includes at least one photoelectric sensor, which is arranged on the additional plate 6 or the base cylinder 1, with the working end of the photoelectric sensor facing the piston rod 31. Accordingly, the baffle 301 is a photoelectric baffle adapted to the photoelectric sensor.

[0064] Based on the above design scheme, the piston rod 31 will slide back and forth during operation. The position changes of the piston rod 31 can be monitored by cooperating with the photoelectric baffle and the photoelectric sensor, and the guide shaft 32 and the suction head push plate 33 both move synchronously with the piston rod 31, thereby realizing the monitoring of the overall position of the piston unit 3.

[0065] Furthermore, the piston unit 3 is equipped with at least one photoelectric sensor to monitor whether the suction head 2 has been removed. This ensures that the piston rod 31 has slid a sufficient distance for the suction head push plate 33 to push the suction head 2 away from the hoist head 4. The photoelectric sensor can measure distance and can therefore also be used to monitor the position of the piston rod 31.

[0066] Optionally, a plurality of photoelectric sensors may be provided, each of which monitors a different position, and the position of the piston unit 3 is determined by whether the photoelectric barrier blocks the corresponding photoelectric sensor.

[0067] It is easy to understand that the photoelectric sensor can be any suitable existing model.

[0068] Optionally, position sensors are provided on each of the X-axis module 51, the Y-axis module 52, and the Z-axis module 53. Based on this design, the position sensors monitor the movement distance of the corresponding modules, preventing collisions at the module ends and ensuring that the liquid in the suction head 2 does not drip due to collisions. This also protects the three modules and increases the service life of the three-axis module 5.

[0069] This embodiment also introduces a fully automatic chemiluminescence analyzer, which includes the aforementioned pipetting module. Based on the aforementioned design, the fully automatic chemiluminescence analyzer can also include any other suitable functional modules in addition to the aforementioned pipetting module, thereby providing a wider range of functionality to meet diverse work requirements and enhance practicality. As will be readily understood, the functional modules can be selected from any suitable existing equipment, providing a wide range of options.

[0070] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A pipette needle, characterized in that: The invention comprises a base cylinder (1), a suction head (2) and a piston unit (3); the base cylinder (1) and the suction head (2) are detachably connected; the piston unit (3) is arranged on the base cylinder (1) in a reciprocating sliding manner; and the piston unit (3) is used for the suction head (2) to suck and discharge liquid and to withdraw the suction head (2).

2. The pipette needle according to claim 1, characterized in that The base cylinder (1) is constructed as a cylindrical structure with both ends open. One end of the base cylinder (1) is connected to the piston unit (3). The other end of the base cylinder (1) is provided with a gourd head (4). The gourd head (4) is plugged into the base cylinder (1) and extends outward. The suction head (2) is detachably connected to the outward end of the gourd head (4). The gourd head (4) is provided with a middle hole for connecting the base cylinder (1) and the suction head (2).

3. The pipette needle according to claim 2, characterized in that The gourd head (4) is in the shape of a shaft, and the two ends of the gourd head (4) are respectively constructed as a first connecting end adapted to the base tube (1) and a second connecting end adapted to the suction head (2), the first connecting end is connected to the base tube (1) through a sealing ring, and the second connecting end is constructed as an enlarged head.

4. The pipette needle according to claim 2 or 3, characterized in that: The piston unit (3) includes a piston rod (31), a guide shaft (32) and a suction head push plate (33); The piston rod (31) is provided on the base cylinder (1) and can slide back and forth along the base cylinder (1), and the piston rod (31) and the gourd head (4) are arranged opposite to each other. Accordingly, one end of the two ends of the base cylinder (1) is closed by the piston rod (31), and the other end is connected to the outside through the middle hole on the gourd head (4); The guide shaft (32) is passed through the base cylinder (1) and is parallel to the axis of the base cylinder (1). The two ends of the guide shaft (32) are respectively connected to the piston rod (31) and the suction head push plate (33). Correspondingly, a mounting hole adapted for the guide shaft (32) is provided on the base cylinder (1); The suction head push plate (33) is sleeved on the gourd head (4) and can slide back and forth along the gourd head (4).

5. The pipette needle according to claim 4, characterized in that A baffle (301) is provided on the piston rod (31), and the suction head push plate (33) includes a suction withdrawal portion (303) sleeved on the gourd head (4) and a baffle portion (304) connected to the suction withdrawal portion (303), and both ends of the guide shaft (32) are detachably connected to the baffle (301) and the baffle portion (304) by screws; At least two guide shafts (32) are provided and evenly distributed on the base cylinder (1), and each guide shaft (32) is sleeved with a spring (302), which is located in the mounting hole.

6. A pipetting module, characterized in that: It comprises a three-axis module (5) and a pipette needle according to any one of claims 1 to 5, wherein the three-axis module (5) comprises an X-axis module (51), a Y-axis module (52) and a Z-axis module (53) connected in sequence, and the Z-axis module (53) is connected to the pipette needle through an additional plate (6), and the additional plate (6) is provided with a driver (7) for driving the piston rod (31) to slide back and forth along the base cylinder (1).

7. The pipetting module according to claim 6, characterized in that: It also includes a controller and a position monitor (8), wherein the controller is electrically connected to the three-axis module (5), the driver (7) and the position monitor (8), and the position monitor (8) is used to monitor the position of the piston rod (31).

8. The pipetting module according to claim 7, characterized in that: The position monitor (8) includes at least one photoelectric sensor, which is arranged on the additional plate (6) or the base cylinder (1). The working end of the photoelectric sensor faces the piston rod (31). Accordingly, the baffle (301) is a photoelectric baffle adapted to the photoelectric sensor.

9. The pipetting module according to any one of claims 6 to 8, characterized in that: Position sensors are respectively provided on the X-axis module (51), the Y-axis module (52) and the Z-axis module (53).

10. A fully automatic chemiluminescence analyzer, characterized in that: The invention comprises the pipetting module according to any one of claims 6 to 9.

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