Coating structure and liquid handling equipment

Abstract

This invention provides a coating structure and a liquid processing device. The coating structure includes a housing, a connector, and a rod. A stop is provided inside the housing. The connector is located at one end of the housing and is used to connect to a drive module, so that the coating structure can be moved by the drive module. The rod has a first end and a second end. A coating head is provided on the first end, and the second end is located inside the housing and abuts against the bottom end of the stop or the connector, so that the second end can move between the stop and the connector. When microorganisms are coated onto a culture medium using the coating structure, the coating head on the first end of the rod can move up and down with the unevenness of the culture medium surface. In this way, not only can the microorganisms on the coating head fully contact the culture medium, but the coating head can also avoid damaging the culture medium, effectively improving the culture efficiency and effect of microorganisms.

Description

Technical Field

[0001] This utility model relates to the technical field of microbial culture, specifically to a coating structure and liquid processing equipment. Background Technology

[0002] In the research and cultivation of microorganisms, it is usually necessary to place the microorganisms in petri dishes. The culture medium in the petri dishes can provide the necessary nutrients and environmental conditions for the growth, reproduction and metabolism of microorganisms, thereby promoting their rapid reproduction and metabolism.

[0003] When microorganisms are inoculated into a petri dish using a coating device, specifically, the coating head of the coating device can be used to pick up the microorganisms and spread them onto the culture medium in the petri dish.

[0004] However, due to the uneven surface of the culture medium, when using a spreading head to apply microorganisms to the surface, if the spreading head travels a short distance, it may fail to contact the depressions on the culture medium surface, resulting in uneven application of the microorganisms. If the spreading head travels a long distance, it may damage the raised areas of the culture medium surface, thus greatly affecting the culture efficiency and results of the microorganisms. Utility Model Content

[0005] In order to at least partially solve the problems existing in the prior art, a coating structure is provided according to one aspect of the present invention.

[0006] The coating structure includes a housing, a connector, and a rod. A stop is provided inside the housing. The connector is located at one end of the housing and is used to connect to a drive module, allowing the drive module to move the coating structure. The rod has a first end and a second end. A coating head is provided on the first end, and the second end is located inside the housing, abutting against the bottom end of the stop or the connector, allowing the second end to move between the stop and the connector.

[0007] The coating structure of this invention includes a connector that can be connected to a drive module to move the coating structure. The second end of the rod can be housed within the casing and moves up and down between the stop and the bottom end of the connector. When microorganisms are coated onto a culture medium using the coating structure, the coating head on the first end of the rod can move up and down with the unevenness of the culture medium surface. This not only ensures that the microorganisms on the coating head make full contact with the culture medium but also prevents the coating head from damaging the culture medium, effectively improving the culture efficiency and effect of microorganisms.

[0008] For example, a counterweight is formed on the second end to apply a downward force to the rod body, and a stop surface is formed on the side of the stop portion facing the connector. The counterweight stops the rod body relative to the housing at the downward limit position by means of the stop surface.

[0009] For example, the counterweight is threadedly connected to the rod body.

[0010] For example, the housing includes a first part and a second part that are connected to each other, the radial dimension of the first part is smaller than the radial dimension of the second part, a stop is formed at the connection between the first part and the second part, and a stop surface is formed at the end of the first part facing the connector.

[0011] For example, a stepped portion is formed on the part of the rod outside the housing, and the stepped portion abuts against the end of the housing away from the connector to limit the length of the rod extending into the housing.

[0012] For example, the connector has a connecting portion that plugs into the near end of the housing, the outer contour of the connecting portion being adapted to the inner contour of the near end of the housing.

[0013] For example, the coating structure also includes an adhesive body, in which a gap is formed between the connector and the inner wall of the near end of the housing, and the adhesive body is disposed within the gap to bond the connector to the housing.

[0014] For example, the portion of the rod body located outside the housing includes a first rod body, a second rod body, and a third rod body connected in sequence. A step portion is formed at the connection between the first rod body and the second rod body. The outer contour of the third rod body is tapered. The small-diameter end of the third rod body is connected to the second rod body, and the large-diameter end of the third rod body is connected to the coating head.

[0015] According to another aspect of this utility model, a liquid handling device is also provided, including a pipetting assembly and a coating structure as described above. The pipetting assembly includes a drive module connected to a connector to drive the coating structure to move via the pipetting assembly.

[0016] For example, the pipetting assembly also includes a pipette tip for transferring the target liquid, and the drive module can also be connected to the pipette tip, with the connector having the same structure as the pipette tip for connecting to the drive module.

[0017] For example, the liquid handling apparatus also includes a plate holder with placement positions formed thereon, on which the coating structure and the pipette tip are disposed to move with the plate holder.

[0018] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0019] The above and other objects, features, and advantages of this utility model will become more apparent from the more detailed description of the embodiments thereof in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this utility model and form part of the specification. They are used together with the embodiments of this utility model to explain the utility model and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0020] Figure 1 A front view of a coating structure according to an exemplary embodiment of the present invention is shown;

[0021] Figure 2 A cross-sectional view of a coating structure according to an exemplary embodiment of the present invention is shown;

[0022] Figure 3 A front view of the housing according to an exemplary embodiment of the present invention is shown;

[0023] Figure 4 A cross-sectional view of the housing according to an exemplary embodiment of the present invention is shown;

[0024] Figure 5 A perspective view of a plate holder and pipette tip assembly according to an exemplary embodiment of the present invention is shown;

[0025] Figure 6 A perspective view of the assembly of the plate frame and coating structure according to an exemplary embodiment of the present invention is shown;

[0026] Figure 7 A front view of the assembly of the plate holder and coating structure according to an exemplary embodiment of the present invention is shown.

[0027] The components indicated by the reference numerals in the figures are as follows:

[0028] 1. Coating structure; 11. Shell; 111. Stop; 1111. Stop surface; 112. First part; 113. Second part; 12. Connector; 121. Connecting part; 13. Rod body; 131. Stepped part; 132. First rod body; 133. Second rod body; 134. Third rod body; 14. Coating head; 15. Counterweight; 2. Pipette tip; 3. Plate holder. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model more apparent, exemplary embodiments according to this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this utility model, and not all embodiments of this utility model. It should be understood that this utility model is not limited to the exemplary embodiments described herein. Based on the embodiments of this utility model described herein, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of this utility model.

[0030] In the following description, numerous details are provided to enable a thorough understanding of the present invention. However, those skilled in the art will appreciate that the following description merely illustrates preferred embodiments of the present invention, which may be practiced without one or more of these details. Furthermore, to avoid confusion with the present invention, some technical features well-known in the art have not been described in detail.

[0031] To fully understand the embodiments of this utility model, a detailed structure will be presented in the following description. Obviously, the implementation of the embodiments of this utility model is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0032] One embodiment of this utility model provides a coating structure 1, in which a coating head 14 disposed on the first end of the rod 13 can rise and fall with the unevenness of the culture medium surface. The coating structure 1 according to an embodiment of this utility model will be described in detail below with reference to the accompanying drawings.

[0033] like Figure 1 and Figure 2 As shown, the coating structure 1 includes a housing 11, a connector 12, and a rod 13. A stop 111 is provided inside the housing 11. The connector 12 is located at one end of the housing 11 and is used to connect to a drive module to drive the coating structure 1 to move. The rod 13 has a first end and a second end. A coating head 14 is provided on the first end, and the second end is located inside the housing 11, abutting against the bottom end of the stop 111 or the connector 12, so that the second end can move between the stop 111 and the connector 12.

[0034] The shell 11 can be cylindrical, and a receiving cavity can be formed inside the cylindrical shell 11. The receiving cavity can extend through the shell 11 along its length. The second end of the rod 13 can be inserted into the receiving cavity of the shell 11, and the first end of the rod 13 can be provided with a coating head 14 and exposed outside the receiving cavity, so that microorganisms can be picked up through the coating head 14.

[0035] The radial dimension of the coating head 14 can be in the range of 3.5 mm to 6 mm. When using the coating structure 1 to cultivate microorganisms, the coating head 14 can have a sufficient cross-sectional area, thereby ensuring that the coating head 14, which is dipped in microorganisms, can have a sufficient contact area with the culture medium.

[0036] The aforementioned connector 12 can be detachably connected to the housing 11. The connector 12 and the housing 11 can be detachably connected or integrally formed. The detachable connection can include plug-in connection or threaded connection, etc. This application does not make specific limitations in this regard.

[0037] The connector 12 may have a cavity for connecting to the drive module. Specifically, the drive module may have a rod-shaped portion, the outer contour of which may be adapted to the inner contour of the cavity, so that the rod-shaped portion of the drive module may be inserted into the cavity of the connector 12, thereby driving the coating structure 1 to move.

[0038] The aforementioned stop 111 can be formed within the receiving cavity and can be at a certain distance from the connector 12. The second end of the rod 13 can move between the stop 111 and the connector 12, thereby allowing at least a portion of the structure of the rod 13 to extend out of or retract from the receiving cavity of the housing 11. It is understood that when microorganisms are coated onto the culture medium in the petri dish using the coating structure 1, the rod 13 can, under its own gravity, allow the coating head 14 on the rod 13 to come into contact with the culture medium. Since the second end of the rod 13 can move between the stop 111 and the connector 12, the rod 13 can undulate up and down with the unevenness of the culture medium surface.

[0039] The coating structure 1 of this invention has a connector 12 that can be connected to a drive module to move the coating structure 1. The second end of the rod 13 can be disposed inside the housing 11 and move up and down between the stop 111 and the bottom end of the connector 12. When microorganisms are coated onto the culture medium using the coating structure 1, the coating head 14 provided on the first end of the rod 13 can move up and down with the unevenness of the culture medium surface. In this way, not only can the microorganisms on the coating head 14 fully contact the culture medium, but the coating head 14 can also avoid damaging the culture medium, effectively improving the culture efficiency and effect of microorganisms.

[0040] In some embodiments, such as Figure 2 As shown, a counterweight 15 is formed on the second end to apply a downward force to the rod body 13. A stop surface 1111 is formed on the side of the stop portion 111 facing the connector 12. The counterweight 15 stops the rod body 13 relative to the housing 11 by the stop surface 1111 to limit the rod body 13 to be in the downward limit position relative to the housing 11.

[0041] When the coating structure 1 is in a vertical position, the counterweight 15 can exert a force on the rod 13 under its own weight, allowing it to move downwards in the vertical direction, thus ensuring that the coating head 14 on the coating structure 1 is in close contact with the culture medium. Furthermore, when the rod 13 is subjected to its own weight and the force exerted by the counterweight 15, the stop surface 1111 of the stop portion 111 can abut against the counterweight 15, preventing the rod 13 from falling out of the housing 11.

[0042] The radial dimension of the aforementioned counterweight 15 can be greater than the radial dimension of the second end of the rod 13, so that a wall surface for abutting against the stop surface 1111 can be formed on the side of the counterweight 15 facing the stop surface 1111.

[0043] In the above embodiment, a counterweight 15 can be provided at one end of the rod 13 near the connecting part 121. On the one hand, when the coating structure 1 is arranged vertically, the weight of the counterweight 15 can act on the rod 13, thereby applying a downward force in the vertical direction to the rod 13. This ensures that the rod 13 remains in close contact with the surface of the culture medium when the microorganisms are coated onto the culture medium in the petri dish using the coating structure 1, effectively improving the coating efficiency and coating effect of the coating structure 1. On the other hand, the counterweight 15 can abut against the stop surface 1111 of the stop part 111, thereby preventing the rod 13 from detaching from the shell 11.

[0044] In some embodiments, such as Figure 2 As shown, the counterweight 15 is threadedly connected to the rod body 13.

[0045] Specifically, the aforementioned counterweight 15 can be a nut, and the second end of the rod 13 can be formed with a screw. The outer surface of the screw can be formed with an external thread that matches the nut, so that the counterweight 15 and the rod 13 can be threadedly connected.

[0046] In embodiments not shown, the counterweight 15 and the rod 13 may be connected by plug-in or snap-fit ​​connections, etc., and this application does not make specific limitations in this regard.

[0047] In the above embodiments, the counterweight 15 can be connected to the rod body 13 by a threaded connection, which greatly facilitates the disassembly and assembly of the counterweight 15 when maintenance, replacement or cleaning is required, and effectively improves the ease of disassembly and assembly of the coating structure 1.

[0048] In some embodiments, such as Figures 2 to 4As shown, the housing 11 includes a first part 112 and a second part 113 that are connected. The radial dimension of the first part 112 is smaller than the radial dimension of the second part 113. A stop 111 is formed at the connection between the first part 112 and the second part 113. A stop surface 1111 is formed at one end of the first part 112 facing the connector 12.

[0049] The radial dimension of the first part 112 can be smaller than the radial dimension of the second part 113, so that the connection between the first part 112 and the second part 113 can be staggered to form a stop part 111. It is understood that the cross-sectional area of ​​the counterweight 15 can be larger than the cross-sectional area of ​​the first part 112, so that the counterweight 15 can abut against the stop part 111.

[0050] In the above embodiments, the stop portion 111 can be formed by a first portion 112 and a second portion 113 with different radial dimensions inside the housing 11. This not only ensures that the rod 13 can be prevented from falling out of the housing 11 by using the stop portion 111, but also simplifies the structure inside the housing 11, avoids structural redundancy, and reduces the manufacturing difficulty and cost of the housing 11.

[0051] In some embodiments, such as Figure 1 and Figure 2 As shown, a step portion 131 is formed on the portion of the rod 13 located outside the housing 11. The step portion 131 abuts against the end of the housing 11 away from the connector 12 to limit the length of the rod 13 extending into the housing 11.

[0052] In the above embodiment, the rod 13 protrudes outward on the side wall of the housing 11 to form a stepped portion 131. When the second end of the rod 13 moves into the receiving cavity, the stepped portion 131 can abut against the end of the housing 11 away from the connecting portion 121, thereby preventing the rod 13 from entering the receiving cavity by too much length, which would cause the microorganisms coated by the coating head 14 on the first end of the rod 13 to come into contact with the outer surface of the housing 11, thus preventing microbial contamination and effectively reducing the risk of microbial contamination.

[0053] In some embodiments, such as Figure 2 As shown, the connector 12 has a connecting portion 121 that is plugged into the near end of the housing 11, and the outer contour of the connecting portion 121 is adapted to the inner contour of the near end of the housing 11.

[0054] Specifically, the proximal end of the housing 11 can be referred to as the first end of the housing 11 away from the coating head 14. The outer contour of the connecting part 121 can be slightly smaller than the inner contour of the proximal end of the housing 11, so that the connecting part 121 can be inserted into the proximal end of the housing 11, thereby realizing a detachable connection between the connecting part 12 and the housing 11.

[0055] The insertion length L between the connector 12 and the housing 11 can be in the range of 5 mm to 15 mm to ensure the firmness and stability of the insertion between the two.

[0056] Of course, in embodiments not shown, the connecting portion 121 may have a hollow chamber, the inner contour of which may be slightly larger than the outer contour of the near end of the housing 11, so that the connecting portion 121 can be fitted onto the near end of the housing 11.

[0057] In the above embodiments, the outer contour of the connecting part 121 can be adapted to the inner contour of the near end of the housing 11, so that the connecting part 12 can be inserted into the housing 11. When it is necessary to repair or replace the components in the coating structure 1, it greatly facilitates the disassembly and assembly of the coating structure 1 and effectively ensures the ease of disassembly and assembly of the coating structure 1.

[0058] In some embodiments, the coating structure 1 further includes an adhesive (not shown in the drawings), and the connecting portion 121 forms a gap with the inner wall of the near end of the housing 11. The adhesive is disposed in the gap to bond the connecting member 12 to the housing 11.

[0059] When the connector 12 is inserted into the proximal end of the housing 11, a gap can be formed between the outer wall of the connector 121 and the inner wall of the proximal end of the housing 11. This gap can be used to accommodate adhesives and other connecting materials. By setting the gap, it is possible to avoid the situation where there is insufficient space to accommodate the adhesive and the bonding is not firm due to the connector 121 being too tightly attached to the proximal end of the housing 11.

[0060] Specifically, the aforementioned adhesive can be a hard colloid such as epoxy resin after curing. This application does not specifically limit the type of adhesive.

[0061] In the above embodiments, the connector 12 can be bonded to the housing 11 by the adhesive, which ensures a firm connection between the connector 12 and the housing 11 and prevents the connector 12 from separating from the housing 11 during the coating operation of the coating structure 1, thus effectively improving the reliability and safety of the coating structure 1.

[0062] In some embodiments, such as Figure 1 and Figure 2 As shown, the part of the rod 13 located outside the housing 11 includes a first rod 132, a second rod 133, and a third rod 134 connected in sequence. A step portion 131 is formed at the connection between the first rod 132 and the second rod 133. The outer contour of the third rod 134 is tapered. The small-diameter end of the third rod 134 is connected to the second rod 133, and the large-diameter end of the third rod 134 is connected to the coating head 14.

[0063] The radial dimension of the first rod 132 can be smaller than that of the second rod 133. On one hand, this allows for the formation of the stepped portion 131 at the connection between the first rod 132 and the second rod 133 without requiring additional structure. On the other hand, the relatively small radial dimension of the first rod 132 not only reduces the weight of the rod body 13 itself but also correspondingly reduces the radial dimension of the housing 11, thereby lowering the manufacturing cost of the coating structure 1. Of course, it is also important to avoid the first rod 132 having an excessively thin radial dimension, which could lead to deformation of the rod body during the coating process and hinder quality control during mass production of the rod body 13. Specifically, the radial dimension of the first rod body 13 can range from 2.5 mm to 3.5 mm.

[0064] The third rod 134 can be shaped like a frustum. The frustum-shaped third rod 134 can have a small-diameter end and a large-diameter end that are arranged opposite to each other. In this way, when the coating structure 1 is pulled out from the plate holder 3 (the plate holder 3 is described in detail below), the outer wall surface of the third rod 134 can have a guiding function, which avoids the coating structure 1 from pulling up the plate holder 3 together during the extraction process, and effectively improves the safety and reliability of the coating structure 1.

[0065] The lengths of the first rod 132, the second rod 133, and the third rod 134 can be determined according to actual needs or actual usage scenarios, and this application does not impose specific limitations on them.

[0066] In the above embodiments, the shaft 13, composed of the first shaft 132, the second shaft 133 and the third shaft 134, simplifies the structure of the shaft 13 while also fulfilling its functional requirements, effectively ensuring the practicality of the shaft 13.

[0067] According to another aspect of this utility model, a liquid handling device is also provided, including a pipetting assembly and a coating structure 1 as described above. The pipetting assembly includes a drive module, which is connected to a connector 12 to drive the coating structure 1 to move through the pipetting assembly.

[0068] The drive module may include a power unit and a pipette for connecting to the pipette tip. The drive module is connected to the connector 12 via the power unit and the pipette. A mating portion may be formed at the end of the pipette facing the coating structure 1, allowing for a detachable connection between the pipette and the coating structure 1. This facilitates flexible movement of the coating structure 1 between different positions, effectively simplifying the connection and separation steps between the pipette and the coating structure 1 and improving the coating efficiency of the coating structure 1. The aforementioned detachable connection may specifically include a plug-in connection or a snap-fit ​​connection, etc., which are not specifically limited in this application.

[0069] The liquid treatment device of this utility model includes the coating structure 1 as described above. Since the coating structure 1 has the beneficial effects described above, the liquid treatment device including the coating structure 1 as described above will also necessarily have the beneficial effects described above.

[0070] In some embodiments, the pipetting assembly further includes a pipette tip 2 for transferring the target liquid. The drive module is also connected to the pipette tip 2 (specifically, the pipette of the drive module is connected to the pipette tip). The connector 12 has the same structure as the pipette tip 2 for connecting to the drive module. Thus, when transferring the target liquid, the pipette is connected to the pipette tip 2, thereby achieving the transfer of the target liquid through the pipette and the power unit, completing the pipetting operation of the liquid handling equipment. Similarly, during the coating operation, since the structure of the connector 12 is the same as the structure of the pipette tip 2 for connecting to the drive module, the pipette is connected to the connector 12, thereby enabling the movement of the coating head through the pipette and the power unit, thus performing the coating operation. The aforementioned pipette tip 2 can specifically be a TIP tip.

[0071] The connector 12 has the same structure as the pipette tip 2 for connecting to the drive module, and can be implemented as follows: An additional pipette tip can be used, by cutting off the lower end of the pipette tip 2 and using the remaining portion of the pipette tip 2 as the connector 12 to be inserted and connected to the proximal end of the housing 11 of the coating structure 1. For example, a portion of the upper 5 mm to 15 mm of the pipette tip 2 can be retained as the connector 12.

[0072] In the above embodiments, since the connector 12 can be replaced by a portion of the existing pipette tip 2, the manufacturing cost of the connector 12 originally required in the coating structure 1 is saved, and the cost of the coating structure 1 and the liquid handling equipment is reduced.

[0073] In some embodiments, such as Figures 5 to 7 As shown, the liquid handling equipment also includes a plate frame 3, on which a placement position is formed. The coating structure 1 and the pipette head 2 are both disposed in the placement position so as to move with the plate frame 3.

[0074] The aforementioned plate frame 3 can have multiple placement positions, each of which can serve as a storage unit for placing the coating structure 1. Thus, a single plate frame 3 can simultaneously support multiple coating structures 1, allowing for the placement and storage of multiple coating structures 1 at once, facilitating subsequent processing operations by the liquid handling equipment.

[0075] For example, after the coating operation of the coating structure 1 is completed, the plate holder 3 carrying multiple coating structures 1 can be placed in the cleaning mechanism to perform cleaning operations on multiple coating structures 1 at the same time.

[0076] In the above embodiments, the plate holder 3 can form a whole structure of multiple coating structures 1, so that subsequent operations can be performed on multiple coating structures 1 at the same time, effectively improving the efficiency and practicality of the liquid processing equipment.

[0077] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of the invention. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of the invention. All such changes and modifications are intended to be included within the scope of the invention as claimed in the appended claims.

[0078] For ease of description, the term "connection" may be used herein to describe the relationship between one or more elements or features shown in the figure and other elements or features. It should be understood that "connection" may include direct connections or indirect connections via other elements or features, and this document is intended to encompass all such cases.

[0079] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, parts, components, and / or combinations thereof.

[0080] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0081] This utility model has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the utility model to the described embodiments. Furthermore, those skilled in the art will understand that this utility model is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this utility model, all of which fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A coated structure characterized by, include: A housing, wherein a stop portion is provided inside the housing; A connector is disposed at one end of the housing and is used to connect to the drive module so as to drive the coating structure to move through the drive module; as well as The rod has a first end and a second end. The first end is provided with a coating head, and the second end is disposed inside the housing. The second end abuts against the bottom end of the stop or the connector, so that the second end can move between the stop and the connector.

2. The coating structure according to claim 1, characterized in that, A counterweight is formed on the second end to apply a downward force to the rod body. A stop surface is formed on the side of the stop portion facing the connector. The counterweight stops the rod body relative to the housing by the stop surface to limit the rod body to the downward limit position.

3. The coating structure according to claim 2, characterized in that, The counterweight is threadedly connected to the rod body.

4. The coating structure according to claim 2, characterized in that, The housing includes a first part and a second part that are connected to each other. The radial dimension of the first part is smaller than that of the second part. The stop is formed at the connection between the first part and the second part, and the stop surface is formed at the end of the first part facing the connector.

5. The coating structure according to claim 1, characterized in that, The portion of the rod outside the housing has a stepped portion that abuts against the end of the housing away from the connector to limit the length of the rod extending into the housing.

6. The coating structure according to claim 1, characterized in that, The connector has a connecting portion that plugs into the near end of the housing, the outer contour of which is adapted to the inner contour of the near end of the housing.

7. The coating structure according to claim 6, characterized in that, The coating structure further includes an adhesive body, and the connecting portion forms a gap with the inner wall of the near end of the housing. The adhesive body is disposed in the gap to bond the connecting member to the housing.

8. The coating structure according to claim 5, characterized in that, The portion of the rod body located outside the housing includes a first rod, a second rod, and a third rod connected in sequence. The stepped portion is formed at the connection between the first rod and the second rod. The outer contour of the third rod is tapered. The small-diameter end of the third rod is connected to the second rod, and the large-diameter end of the third rod is connected to the coating head.

9. A liquid processing device, characterized in that, The device includes a pipetting assembly and a coating structure as described in any one of claims 1 to 8, wherein the pipetting assembly includes the driving module, the driving module being connected to the connector to drive the coating structure to move via the pipetting assembly.

10. The liquid handling apparatus according to claim 9, characterized in that, The pipetting assembly also includes a pipette tip for transferring the target liquid, and the drive module can be connected to the pipette tip. The connector is identical to the structure of the pipette tip for connecting to the drive module.

11. The liquid handling apparatus according to claim 9, characterized in that, The liquid handling equipment also includes a plate frame with placement positions formed on the plate frame. The coating structure and the pipetting assembly head are both disposed on the placement positions so as to move with the plate frame.

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