Mechanical positioning multichannel pipettor

Abstract

The present invention provides a mechanical positioning multichannel pipettor, and relates to the field of pipettors, the mechanical positioning multichannel pipettor comprises a main body, a plurality of pipetting channels arranged on the main body, and pipetting heads arranged at one end of the main body and corresponding to the pipetting channels, and further comprises: an adjusting mechanism arranged in the main body, the adjusting mechanism comprises an adjusting slide block moving along the length direction of the main body; the positioning assembly comprises a positioning block, a guide sliding rail and a locking piece. The adjusting sliding block is arranged on one side of the positioning block, the guide sliding rail is fixedly arranged in the main body, and the positioning block is slidably arranged on the guide sliding rail; the locking piece is movably arranged on the main body, and the locking piece is provided with a locking position selectively matched with the positioning block and a releasing position separated from the positioning block; wherein the adjusting slide block is in transmission connection with the pipetting channel through the connecting assembly. The device has the advantages of being accurate in adjustment, reliable in locking, visual in operation and durable in structure. The accuracy and stability of spacing adjustment are ensured, and the use convenience is improved through visual indication and operation design.

Description

Technical Field

[0001] This invention relates to the field of pipettes, and more particularly to a mechanically positioned multichannel pipette. Background Technology

[0002] Multichannel pipettes are crucial tools for the efficient transfer of minute amounts of liquids in biochemical and molecular biology experiments. The flexible and accurate adjustment of the channel spacing is essential for matching different well plate sizes, directly affecting experimental throughput and ease of operation. Due to the diverse specifications of experimental sample carriers and the high precision requirements for alignment, the pipette's spacing adjustment mechanism must possess reliable positioning stability and an intuitive adjustment experience.

[0003] Traditional multichannel pipettes have certain limitations in terms of spacing adjustment and locking. The adjustment process is often not intuitive, making it difficult for users to accurately perceive and set the target spacing. Furthermore, common locking methods may rely on simple friction damping or simple latches, which are prone to slippage or wear during frequent adjustments or long-term use, leading to decreased positioning reliability. At the same time, the adjustment mechanism and indicating system are usually not strongly integrated, making operation cumbersome and lacking an integrated, efficient human-computer interaction design, thus affecting experimental efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a mechanically positioned multichannel pipette, which addresses the above-mentioned deficiencies in the prior art.

[0005] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide a mechanically positioned multichannel pipette to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A mechanically positioned multichannel pipette includes: a main body, a plurality of pipetting channels disposed on the main body, and a pipetting tip disposed at one end of the main body and corresponding to each of the pipetting channels, characterized in that it further includes: An adjustment mechanism is disposed inside the main body, and the adjustment mechanism includes an adjustment slider that can move along the length direction of the main body; A positioning component, comprising a positioning block, a guide rail, and a locking element; The adjusting slider is located on one side of the positioning block, the guide rail is fixedly installed inside the main body, and the positioning block is slidably installed on the guide rail; The locking element is movably disposed on the main body, and the locking element has a locking position that selectively engages with the positioning block, and a releasing position that separates from the positioning block; The adjusting slider moves along the length of the main body under the drive of the connecting component, and drives the pipetting channels to move synchronously to change their adjacent spacing.

[0007] Preferably, the positioning block is provided with a plurality of positioning teeth, the locking member has a locking surface that engages with the positioning teeth, and the locking member is connected to an elastic member that provides a biasing force toward the locking position.

[0008] Preferably, the positioning tooth has an engagement surface that mates with the locking surface and a guide slope that guides the locking member to slide, and the locking member has a trigger surface that contacts the guide slope.

[0009] Preferably, the bottom of the positioning block is provided with a guide groove that matches the shape of the guide rail, a bushing is embedded in the guide groove, and an indicator piece indicating its position is connected to the side of the positioning block.

[0010] Preferably, the connecting assembly includes a driving pulley, a driven pulley, and a timing belt. The driving pulley and the driven pulley are rotatably disposed within the main body. The timing belt is arranged around the driving pulley and the driven pulley. The adjusting slider is disposed on one side of the timing belt.

[0011] Preferably, the connecting assembly further includes a tensioning wheel, which is adjustablely positioned within the main body and presses against the timing belt. The main body also includes an adjustment knob coaxially connected to the drive pulley.

[0012] Preferably, the main body surface is provided with an indicator window, the adjustment slider is provided with a pointer pointing to the indicator window, and the indicator window is provided with a label containing the spacing value and a cover plate provided above it.

[0013] Preferably, the locking member is connected to a button extending to the outside of the main body, a sealing ring is installed between the button and the main body, and the surface of the button is provided with anti-slip texture.

[0014] Preferably, the inner wall of the main body is provided with a first limiting block and a second limiting block, the first limiting block and the second limiting block are respectively located at both ends of the moving path of the adjusting slider, the first limiting block is provided with a first buffer pad on the side facing the adjusting slider, and the second limiting block is provided with a second buffer pad on the side facing the adjusting slider.

[0015] Preferably, the pipette tip is connected to the pipetting channel via a quick-change connector. The quick-change connector includes a sleeve disposed at the end of the pipetting channel and a retaining post disposed on the pipette tip. The inner wall of the sleeve is provided with an annular retaining groove, and the outer wall of the retaining post is provided with an elastic protrusion that connects to the annular retaining groove.

[0016] The present invention adopts the above technical solution and has the following technical effects compared with the prior art: 1. Precise and reliable positioning: It adopts a gear-type mechanical positioning structure, which locks firmly and can effectively prevent the pipette tip spacing from changing accidentally during operation.

[0017] 2. Intuitive and convenient adjustment: The integrated adjustment knob, pointer and scale window enable intuitive one-button adjustment and real-time reading, making operation simple and efficient.

[0018] 3. Stable structure and easy maintenance: The internal transmission is smooth, key components are wear-resistant and equipped with buffer and dust protection; the pipette tip supports quick disassembly and assembly, making it easy to replace and clean.

[0019] 4. Overall design optimization: The compact and coordinated structure, along with anti-slip and sealing details, improves the operating feel and the reliability of the equipment under long-term use. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of a mechanically positioned multichannel pipette according to the present invention; Figure 2 This is a schematic diagram of the adjustment mechanism and connection components of a mechanically positioned multichannel pipette according to the present invention; Figure 3 This is a schematic diagram showing the connection between the adjustment mechanism and the positioning block of a mechanically positioned multichannel pipette according to the present invention; Figure 4 This is a schematic diagram showing the positional relationship between the positioning block, connecting assembly, and adjustment mechanism of a mechanically positioned multichannel pipette according to the present invention. Figure 5 This is a schematic diagram of the locking element and positioning teeth of a mechanically positioned multichannel pipette according to the present invention; Figure 6 This is a schematic diagram of the main body and quick-change connector of a mechanically positioned multichannel pipette according to the present invention; Figure 7 This is a schematic diagram of a quick-change connector for a mechanically positioned multichannel pipette according to the present invention; Figure 8 This is a rear view schematic diagram of the main body of a mechanically positioned multichannel pipette according to the present invention; Figure 9 This is a schematic diagram of the adjusting slider and pipetting channel of a mechanically positioned multichannel pipette according to the present invention.

[0021] The reference numerals in the attached drawings are as follows: 1. Main body; 101. Pipette channel; 102. Pipette head; 2. Adjustment mechanism; 201. Adjustment slider; 3. Positioning assembly; 301. Positioning block; 3011. Guide groove; 3012. Bushing; 302. Guide slide rail; 303. Locking element; 3031. Trigger surface; 304. Positioning tooth; 3041. Engaging surface; 3042. Guide slope; 305. Locking surface; 306. Elastic element; 4. Connecting assembly; 401. Main body 402 Driven pulley; 403 Synchronous belt; 404 Tensioner; 405 Adjustment knob; 5 Indicator window; 501 Pointer; 502 Label; 503 Cover plate; 6 Button; 601 Sealing ring; 602 Anti-slip texture; 7 First limit block; 701 First buffer pad; 8 Second limit block; 801 Second buffer pad; 9 Quick-change connector; 901 Sleeve; 902 Locking post; 903 Annular groove; 904 Elastic protrusion. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1

[0025] As attached Figures 1 to 9 The illustrated multichannel pipette with mechanical positioning has a main body 1 that is a hollow elongated shell. The interior of the main body 1 forms a cavity to accommodate an adjustment mechanism 2, a positioning component 3, and a connecting component 4. The side wall of the main body 1 has a through hole for a button 6 to pass through and an indicator window 5 for displaying a label 502. One end of the main body 1 has an installation port for multiple pipetting heads 102 to extend out. Multiple pipetting channels 101 are arranged in parallel and partially accommodated inside the main body 1. The end of each pipetting channel 101 is used to install a pipetting head 102. The pipetting head 102 is a detachable liquid aspiration and dispensing component, which is sealed to the end of the pipetting channel 101 through a quick-connect fitting 9.

[0026] The adjustment mechanism 2 is located in the middle of the cavity of the main body 1. The adjustment slider 201 is a long strip-shaped block structure, which is fixedly connected to or integrally formed with the positioning block 301, thus forming a component that moves synchronously with the positioning block 301. When an external force is applied to the adjustment slider 201 through the connecting component 4, the adjustment slider 201 drives the positioning block 301 to slide together along the length of the main body 1. A linkage mechanism is provided between the adjustment slider 201 and the pipetting channel 101. The linkage can be a scissor-type scaling mechanism, which consists of multiple cross-hinged linkage groups. The bottom hinge point is fixedly connected to the adjusting slider 201, and the top hinge point is fixedly connected to the base of multiple pipetting channels 101 respectively. When the adjusting slider 201 is driven by the synchronous belt 403 to move linearly left and right, it will force the included angle of all the cross links in the scissor fork mechanism to change synchronously, thereby pushing or pulling the base of all the pipetting channels 101 open or close at equal distances in the horizontal direction, realizing the synchronous and equal adjustment of the distance between all adjacent pipetting channels 101. This structure ensures high rigidity of transmission and synchronous accuracy of movement.

[0027] In positioning component 3, the guide rails 302 are two parallel slender rods, fixedly installed on the base on the inner wall of the main body 1; the positioning block 301 sits as a whole on the two guide rails 302, and its bottom has two guide grooves 3011 that precisely match the guide rails 302. Each guide groove 3011 is fitted with a bushing 3012 made of low friction material, and the inner hole of the bushing 3012 slides in contact with the outer surface of the guide rail 302; an indicator piece is fixedly installed on the side of the positioning block 301, and the indicator piece extends from the side of the positioning block 301 and points to the area of ​​the indicator window 5; the locking member 303 is provided on the side of the positioning block 301. Above, it is movably mounted on the main body 1 via a pivot or guide rail, so that the locking member 303 can swing or translate in the sliding direction perpendicular to the positioning block 301; one end of the locking member 303 has a locking surface 305, and the other end is connected to an elastic member 306, the other end of which is fixed to the inner wall of the main body 1; the upper surface of the positioning block 301 is machined with a row of continuous positioning teeth 304 along its sliding direction, each positioning tooth 304 having a vertical meshing surface 3041 and an inclined guide slope 3042; the locking member 303 is correspondingly provided with a trigger surface 3031 that contacts the guide slope 3042.

[0028] The connecting assembly 4 includes a driving pulley 401 disposed at one end of the cavity of the main body 1 and a driven pulley 402 disposed at the other end. The driving pulley 401 and the driven pulley 402 are mounted parallel to each other in the main body 1 via bearings. A timing belt 403 is wrapped around the driving pulley 401 and the driven pulley 402. An adjusting slider 201 is fixedly connected to the outside of one straight edge of the timing belt 403. A tensioning wheel 404 is disposed in the main body 1 through a mounting plate with an elongated hole, and its wheel surface presses against the non-working edge of the timing belt 403. An adjusting knob 405 is installed on the outside of the main body 1, and its rotating shaft passes through the wall of the main body 1 and is directly connected to the central axis of the driving pulley 401.

[0029] The indicator window 5 is a rectangular opening on the upper surface of the main body 1. The cover plate 503 covers and seals the opening by adhesive or snap-fit. The label 502 is pasted on the inner wall of the main body 1 inside the opening of the indicator window 5, and its surface is printed with spacing scale. The pointer 501 is vertically fixed to the top of the adjusting slider 201, and its tip extends upward to a position close to the lower surface of the cover plate 503.

[0030] Button 6 has a columnar structure, with its inner end in contact with or connected to the trigger end of locking member 303, used to push locking member 303 to move against the elastic force of elastic member 306, and its outer end protruding from the surface of body 1 for finger pressing; sealing ring 601 is sleeved on button 6 and embedded in the groove of the inner wall of through hole of body 1 to form a sliding seal; anti-slip texture 602 is a mesh or strip-shaped concave and convex texture processed on the exposed surface of button 6.

[0031] The first limiting block 7 and the second limiting block 8 are respectively fixedly installed at both ends of the inner wall of the main body 1, and they are located at the end of the moving path of the adjusting slider 201; the first buffer pad 701 is attached to the surface of the first limiting block 7 facing the inner side of the cavity, and the second buffer pad 801 is attached to the surface of the second limiting block 8 facing the inner side of the cavity.

[0032] In the quick-change connector 9, the sleeve 901 is fixed at the end outlet of the pipetting channel 101; the retaining post 902 is fixed at the base of the pipetting head 102, and its outer diameter is slightly smaller than the inner diameter of the sleeve 901; the annular groove 903 is an annular groove surrounding the inner wall of the sleeve 901; the elastic protrusion 904 is one or more radially elastically contractible hemispherical or wedge-shaped protrusions provided on the outer wall of the retaining post 902, and its material hardness is lower than that of the sleeve 901.

[0033] Example 2

[0034] Based on Embodiment 1, the solution in Embodiment 1 will be further described in detail below with reference to the specific working method, such as... Figures 1 to 9 As shown below, see details: Furthermore, multiple positioning teeth 304 on the positioning block 301 are regularly arranged. The locking surface 305 of the locking member 303 engages with one side of the positioning tooth 304 to form a locking mechanism. The elastic member 306 is installed between the locking member 303 and the inner wall of the main body 1, providing continuous bias pressure to push the locking member 303 so that its locking surface 305 presses against the positioning tooth 304. When unlocking is required, an external force is applied to the locking member 303 to make it move against the bias pressure of the elastic member 306. The locking surface 305 then disengages from the currently engaged positioning tooth 304, and the positioning block 301 can slide freely. After the positioning block 301 slides to the desired position, the external force applied to the locking member 303 is removed. The bias pressure of the elastic member 306 pushes the locking member 303 to reset, so that its locking surface 305 re-engages with the corresponding positioning tooth 304, thus achieving positioning and locking.

[0035] Furthermore, the meshing surface 3041 and the guide slope 3042 are located on different sides of the positioning tooth 304. The meshing surface 3041 is set as a plane perpendicular to the sliding direction of the positioning block 301, and the guide slope 3042 is set as a slope inclined relative to the sliding direction. The trigger surface 3031 of the locking member 303 is set as an inclined surface adapted to the guide slope 3042. When the positioning block 301 slides under the action of external force, the guide slope 3042 of the positioning tooth 304 will contact and press the trigger surface 3031 of the locking member 303. This pressing action forces the locking member 303 to overcome the elastic force of the elastic member 306. Lateral movement causes the locking surface 305 of the locking member 303 to slide off the meshing surface 3041 of the current positioning tooth 304. Once the positioning block 301 slides to a position where the trigger surface 3031 passes the top of the guide slope 3042, the elastic force of the elastic member 306 pushes the locking member 303 to move in the opposite direction and reset, so that the locking surface 305 re-contacts and engages with the meshing surface 3041 of the next positioning tooth 304, completing one positioning jump. The inclination angle of the guide slope 3042 determines the magnitude of the external force required for unlocking, and the planar fit between the meshing surface 3041 and the locking surface 305 ensures the stability after locking.

[0036] Furthermore, the cross-sectional shape of the guide groove 3011 matches the cross-sectional shape of the guide rail 302 to achieve precise guidance. The bushing 3012 is fixedly embedded in the inner wall of the guide groove 3011. When the positioning block 301 slides, the inner surface of the bushing 3012 contacts the outer surface of the guide rail 302 and moves relative to it, thereby reducing sliding friction resistance and wear. The marking plate is fixedly connected to the side surface of the positioning block 301 and moves with the positioning block 301. The marking plate is marked with scales or symbols, and its movement trajectory corresponds to the indicator window 5 set on the main body 1. The real-time position of the positioning block 301 can be read by observing the position of the marking plate relative to the indicator window 5.

[0037] Furthermore, the driving pulley 401 is connected to the adjusting knob 405 located outside the main body 1 via a rotating shaft. The driven pulley 402 is installed inside the main body 1 via another rotating shaft and is kept parallel to the driving pulley 401. The synchronous belt 403 is a closed annular transmission belt with a toothed structure on its inner surface that meshes with the toothed grooves on the outer circumferential surfaces of the driving pulley 401 and the driven pulley 402. The adjusting slider 201 is fixedly connected to the outer belt surface of the synchronous belt 403. When the adjusting knob 405 is rotated, the driving pulley 401 rotates accordingly, driving the synchronous belt 403 to rotate cyclically through toothed meshing. The rotation of the synchronous belt 403 causes the driven pulley 402 to rotate as well. At the same time, the adjusting slider 201 fixed on the synchronous belt 403 moves with the straight section of the synchronous belt 403, thereby performing precise linear displacement along the length direction of the main body 1.

[0038] Furthermore, the tensioning pulley 404 is mounted inside the main body 1 via a movable mounting bracket. By adjusting the position of the mounting bracket, the degree of pressure of the tensioning pulley 404 relative to the synchronous belt 403 can be changed. Thus, the wheel surface of the tensioning pulley 404 always presses against the non-meshing side of the synchronous belt 403 to eliminate transmission gaps and ensure stable tension of the synchronous belt 403. The rotating shaft of the adjusting knob 405 passes through the wall of the main body 1 and is directly connected to the rotating shaft of the drive pulley 401. When the adjusting knob 405 is manually rotated, the rotation action is directly transmitted to the drive pulley 401 through a coaxial connection. The drive pulley 401 drives the synchronous belt 403 to move. The tensioning pulley 404 rotates under the pressure of the synchronous belt 403 and relies on its clamping force to ensure that the synchronous belt 403, the drive pulley 401, and the driven pulley 402 maintain a tight mesh without slippage, thereby achieving precise positioning and adjustment of the adjusting slider 201.

[0039] Furthermore, the indicator window 5 is a strip-shaped opening on the outer shell of the main body 1. The label 502 is fixedly attached to the inside of the indicator window 5, and numerical scales representing the spacing between the pipette tips 102 are printed on it. The cover plate 503 covers and seals the opening of the indicator window 5. One end of the pointer 501 is vertically connected to the top of the adjusting slider 201, and the other end extends upward and points to the cover plate 503. When the adjusting slider 201 is driven to move by the connecting component 4, the pointer 501 fixed to it moves synchronously. The tip of the pointer 501 slides under the cover plate 503 and points to different numerical scales on the label 502, thereby intuitively indicating the current spacing setting value between multiple pipette tips 102. The cover plate 503 prevents dust or liquid from entering the interior of the indicator window 5 and protects the label 502 from wear.

[0040] Furthermore, button 6 is fixed to one end of locking member 303 and extends to the outside through a hole in the wall of main body 1. Sealing ring 601 is installed between button 6 and the inner wall of the hole to form an annular seal. Anti-slip texture 602 is machined on the exposed surface of button 6. When button 6 is pressed with a finger, button 6 moves into the body 1 and pushes the locking member 303 connected to it to move together. Locking member 303 overcomes the biasing force of elastic member 306 and disengages the locking surface 305 from the positioning tooth 304. When button 6 is released, the biasing force of elastic member 306 pushes locking member 303 to move in the opposite direction and reset. Locking member 303 drives button 6 back to the initial extended position. During this process, sealing ring 601 undergoes elastic deformation as button 6 moves and always fills the gap between button 6 and hole to maintain a sealed state, preventing dust or liquid from entering the interior of body 1. At the same time, anti-slip texture 602 on the surface of button 6 provides sufficient frictional resistance for the finger, ensuring that it is not easy to slip when pressing or releasing.

[0041] Furthermore, the first limiting block 7 and the second limiting block 8 are fixedly connected to both ends inside the main body 1. The first buffer pad 701 is attached to the side of the first limiting block 7 facing the direction of movement of the adjusting slider 201, and the second buffer pad 801 is attached to the side of the second limiting block 8 facing the direction of movement of the adjusting slider 201. When the adjusting slider 201 moves towards the first limiting block 7 and contacts it under the drive of the connecting component 4, the end face of the adjusting slider 201 presses against the first buffer pad 701. The first buffer pad 701 undergoes elastic deformation to absorb the impact and limit the continued movement of the adjusting slider 201. When the adjusting slider 201 moves in the opposite direction to contact the second limiting block 8, its end face presses against the second buffer pad 801. Similarly, the elastic deformation of the second buffer pad 801 buffers and stops the movement, thereby preventing the adjusting slider 201 from rigidly colliding with the inner wall of the main body 1.

[0042] Furthermore, the sleeve 901 is fixedly connected to the end of the pipetting channel 101, the retaining post 902 is fixedly connected to the base of the pipetting head 102, the annular groove 903 is a groove surrounding the inner wall of the sleeve 901, and the elastic protrusion 904 is a radially elastically deformable protrusion provided on the outer wall of the retaining post 902; when installing the pipetting head 102, the retaining post 902 is aligned and inserted into the sleeve 901, the elastic protrusion 904 on the outer wall of the retaining post 902 undergoes radial elastic contraction due to the compression of the inner wall of the sleeve 901, as the retaining post 902 continues to penetrate deeper. When the elastic protrusion 904 moves to the axial position corresponding to the annular groove 903, the elastic protrusion 904 expands radially by its own elasticity and gets into the annular groove 903, thus completing the connection and locking. When it is necessary to disassemble the pipette head 102, the pipette head 102 is pulled outward. The applied axial pulling force causes the inclined surface of the elastic protrusion 904 to squeeze the groove edge of the annular groove 903, forcing the elastic protrusion 904 to retract radially and disengage from the annular groove 903. The locking pin 902 can then be pulled out of the sleeve 901, achieving rapid separation.

[0043] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly, the accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. Finally, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mechanically positioned multichannel pipette, comprising: The main body (1), a plurality of pipetting channels (101) disposed on the main body (1), and a pipetting tip (102) disposed at one end of the main body (1) and corresponding to each of the pipetting channels (101), characterized in that it further comprises: An adjustment mechanism (2) is provided inside the main body (1). The adjustment mechanism (2) includes an adjustment slider (201) that can move along the length direction of the main body (1). The positioning component (3) includes a positioning block (301), a guide rail (302), and a locking element (303). The adjusting slider (201) is located on one side of the positioning block (301), the guide rail (302) is located inside the main body (1), and the positioning block (301) is slidably located on the guide rail (302). The locking member (303) is movably disposed on the main body (1), and the locking member (303) has a locking position that selectively engages with the positioning block (301), and a release position that separates from the positioning block (301); The adjusting slider (201) moves along the length of the main body (1) under the drive of the connecting component (4), and drives the pipetting channel (101) to move synchronously to change its adjacent spacing.

2. The multi-channel pipette with mechanical positioning according to claim 1, characterized in that: The positioning block (301) is provided with a plurality of positioning teeth (304), the locking member (303) has a locking surface (305) that engages with the positioning teeth (304), and the locking member (303) is connected to an elastic member (306) that provides pressure toward the locking position.

3. A multi-channel pipette with mechanical positioning according to claim 2, characterized in that: The positioning tooth (304) has an engagement surface (3041) that mates with the locking surface (305) and a guide slope (3042) that guides the locking member (303) to slide. The locking member (303) has a trigger surface (3031) that contacts the guide slope (3042).

4. A multi-channel pipette with mechanical positioning according to claim 2, characterized in that: The bottom of the positioning block (301) is provided with a guide groove (3011) that matches the shape of the guide slide rail (302), and a bushing (3012) is embedded in the guide groove (3011).

5. A multi-channel pipette with mechanical positioning according to claim 1, characterized in that: The connecting assembly (4) includes a driving pulley (401), a driven pulley (402), and a timing belt (403). The driving pulley (401) and the driven pulley (402) are rotatably disposed within the main body (1). The timing belt (403) is disposed around the driving pulley (401) and the driven pulley (402). The adjusting slider (201) is disposed on one side of the timing belt (403).

6. A multi-channel pipette with mechanical positioning according to claim 5, characterized in that: The connecting assembly (4) also includes a tensioning wheel (404), which is adjustablely positioned inside the main body (1) and presses against the synchronous belt (403). The main body (1) also has an adjusting knob (405) coaxially connected to the drive pulley (401).

7. A multi-channel pipette with mechanical positioning according to claim 1, characterized in that: The main body (1) has an indicator window (5) on its surface. The adjustment slider (201) has a pointer (501) pointing to the indicator window (5). The indicator window (5) has a label (502) containing the spacing value and a cover plate (503) above it.

8. A multi-channel pipette with mechanical positioning according to claim 1, characterized in that: The locking member (303) is connected to a button (6) extending to the outside of the body (1), a sealing ring (601) is installed between the button (6) and the body (1), and the surface of the button (6) is provided with anti-slip texture (602).

9. A multi-channel pipette with mechanical positioning according to claim 1, characterized in that: The inner wall of the main body (1) is provided with a first limiting block (7) and a second limiting block (8). The first limiting block (7) and the second limiting block (8) are respectively located at both ends of the moving path of the adjusting slider (201). The first limiting block (7) is provided with a first buffer pad (701) on the side facing the adjusting slider (201), and the second limiting block (8) is provided with a second buffer pad (801) on the side facing the adjusting slider (201).

10. A multi-channel pipette with mechanical positioning according to claim 1, characterized in that: The pipette tip (102) is connected to the pipetting channel (101) via a quick-connect connector (9). The quick-connect connector (9) includes a sleeve (901) disposed at the end of the pipetting channel (101) and a retaining post (902) disposed on the pipette tip (102). The inner wall of the sleeve (901) is provided with an annular retaining groove (903), and the outer wall of the retaining post (902) is provided with an elastic protrusion (904) connected to the annular retaining groove (903).

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