Measuring range locking mechanism of pipettor and pipettor

Abstract

The invention discloses a measuring range locking mechanism of a pipettor and the pipettor. The measuring range locking mechanism comprises a driving part; the first locking piece is arranged on the driving piece in a sleeving mode, and the first locking piece can be configured to be rotationally coupled with the driving piece; the second locking piece is arranged on the driving piece in a sleeving manner and can move in the first direction, so that the second locking piece can be switched between a locking posture and an unlocking posture, the second locking piece and the first locking piece are tightly attached, rotationally coupled in the locking posture, and the second locking piece and the first locking piece are separated in the unlocking posture; and the execution unit is used for driving the second locking piece to move in the first direction. According to the measuring range locking mechanism, rotary locking of the plunger rod is achieved through meshing cooperation of the first locking piece and the second locking piece, and rotary locking or unlocking of the plunger rod can be achieved by controlling the second locking piece to be attached to the first locking piece or to be separated from the first locking piece; and the problem of locking drifting caused by locking modes such as friction and holding is effectively avoided.

Description

Technical Field

[0001] This application belongs to the technical field of pipettes, and particularly relates to a range locking mechanism and a pipette for a pipette. Background Art

[0002] A pipette usually realizes the transfer operation of a certain volume of liquid through the vacuum generated by the retraction of a piston in the pipette body. The movement of the pipette piston is adjusted to suck the liquid of the expected measurement amount into the tip during the aspiration stage of the pipetting operation. Since the user may need to aspirate various different liquid amounts with the pipette, the pipette usually provides different volume ranges and adjustability within the selected volume range. The volume adjustability is usually achieved by manually rotating the set volume setting shaft or manually rotating the plunger operation button and the associated plunger of the pipette, so as to cause a change in the volume setting of the pipette through one of a variety of possible associated mechanisms.

[0003] In order to achieve range locking after the volume adjustment is completed, the pipette usually also provides a range locking device for locking the plunger or the associated structure. Currently, the range locking device usually adopts the method of pressure locking or self-friction of the driving parts to achieve range locking. However, the locking structure and the self-friction structure are prone to looseness during the liquid transfer process, thereby causing the rotation deviation of the driving part, and thus resulting in deviation of the experimental results. Summary of the Invention

[0004] The purpose of this application is to provide a range locking mechanism and a pipette for a pipette, so as to solve the technical problem that in the prior art, the range locking device usually adopts the method of pressure locking or self-friction of the driving parts to achieve range locking, but the locking structure and the self-friction structure are prone to looseness during the liquid transfer process, thereby causing the rotation deviation of the driving part, and thus resulting in deviation of the experimental results.

[0005] In order to achieve the above purpose, a technical solution adopted by this application is:

[0006] Provide a range locking mechanism for a pipette, including:

[0007] A driving part for rotationally coupling with a plunger rod;

[0008] A first locking part sleeved on the driving part, and the first locking part can be configured to be rotationally coupled with the driving part;

[0009] A second locking member is sleeved on the driving member. The second locking member is movably arranged in a first direction so that the second locking member can switch between a locked posture and an unlocked posture. When the second locking member is in the locked posture, the second locking member and the first locking member are in close contact and rotationally coupled. When the second locking member is in the unlocked posture, the second locking member is separated from the first locking member;

[0010] An execution unit is configured to drive the movement of the second locking member in the first direction so that the second locking member switches between the locked posture and the unlocked posture;

[0011] Wherein, the first direction is the axial direction of the driving member.

[0012] In one or more embodiments, the first locking member includes a first locking surface facing the second locking member, and a circle of first engaging teeth is arranged on the first locking surface;

[0013] The second locking member includes a second locking surface facing the first locking surface, and a circle of second engaging teeth matching the first engaging teeth is arranged on the second locking surface;

[0014] Wherein, when the second locking member is in the locked posture, the second engaging teeth are engaged with the second engaging teeth to lock the first locking member and the second locking member in the rotational direction.

[0015] In one or more embodiments, the second locking member includes a pressure-receiving portion, and the execution unit includes an execution end located on one side of the pressure-receiving portion in the first direction. The execution unit drives the execution end to move in the first direction so that the execution end abuts against the pressure-receiving portion to drive the second locking member to move in the first direction.

[0016] In one or more embodiments, the execution unit includes:

[0017] A limiting member is arranged on one side of the pressure-receiving portion in the first direction. A through limiting hole is arranged inside the limiting member. The limiting hole extends in the first direction, and a limiting portion is arranged on the inner wall of the limiting hole;

[0018] An execution member is movably arranged in the limiting hole. An execution end is provided at one end of the execution member facing the pressure-receiving portion, and a locking portion is provided on the execution member for cooperating with the limiting portion to lock the position of the execution member;

[0019] When the locking part and the limiting part cooperate to lock, the execution end abuts against the pressure-receiving part to limit the second locking part in the unlocking posture. When the locking part disengages from the limiting part, the execution end can move away from the pressure-receiving part, so that the second locking part can be reset to the locking posture.

[0020] In one or more embodiments, the limiting part includes first convex ribs uniformly arranged on the inner wall of the limiting hole. The first convex ribs extend along the first direction, and a limiting surface is provided on one end surface of the first convex ribs facing the pressure-receiving part.

[0021] The locking part includes second convex ribs uniformly arranged on the outer wall of the actuator. The second convex ribs extend along the first direction, and a locking surface is provided on one end surface of the second convex ribs facing away from the pressure-receiving part.

[0022] Wherein, the locking surface and the limiting surface can cooperate to abut against each other to lock the position of the actuator.

[0023] In one or more embodiments, the execution unit further includes a manipulating member. The manipulating member is arranged in the limiting hole, and the manipulating member is sleeved on the side of the actuator facing away from the pressure-receiving part. The manipulating member is used to drive the actuator to move in the first direction and circumferentially, so that the locking surface can cooperate with the limiting surface to abut against each other or can disengage from the limiting surface.

[0024] In one or more embodiments, the limiting part further includes third convex ribs arranged on both sides of each first convex rib. The third convex ribs extend along the first direction, and a first guiding surface inclined relative to the circumferential direction is provided on one end surface of the third convex ribs facing the pressure-receiving part. The first guiding surface is connected to the limiting surface as a whole. A locking groove is formed between each third convex rib and the adjacent third convex rib on one side.

[0025] A circle of saw teeth is provided on one end surface of the manipulating member facing the pressure-receiving part. The saw teeth include a second guiding surface inclined relative to the circumferential direction.

[0026] Wherein, the saw teeth are used to abut against the locking surface and drive the actuator to disengage from the limiting surface when the manipulating member moves towards the pressure-receiving part. The second guiding surface is used to guide the actuator to the first guiding surface by abutting against the locking surface. The first guiding surface is used to guide the actuator to the limiting surface or the locking groove by abutting against the locking surface.

[0027] In one or more embodiments, the thickness of the third ridge is greater than that of the first ridge, so that a guide groove is formed between the third ridges on both sides of each of the first ridges, and a plurality of guide blocks are evenly arranged on the outer wall of the operating member, and the guide blocks extend along the first direction, and the guide blocks are embedded in the guide groove or the locking groove to limit the moving direction of the operating member.

[0028] In one or more embodiments, the operating member is provided with a plurality of elastic arms evenly spaced apart at one end away from the actuator, the elastic arms extend along a first direction, and the plurality of elastic arms surround an elastic space, and when the operating member drives the actuator to move, the actuator is embedded in the elastic space and stretches the elastic arms outward, so that after the actuator moves into place, the operating member can be reset under the elastic action of the elastic arms.

[0029] In one or more embodiments, a notch is provided on the end surface of the actuator end, and a boss matching the notch is provided on a side of the pressure-bearing portion facing the actuator.

[0030] In one or more embodiments, a storage spring is further included, wherein the storage spring is arranged between one end of the driving member and the second locking member, and the storage spring is used to drive the second locking member to move toward the first locking member.

[0031] In one or more embodiments, the outer circumferential surface of the driving member is provided with a circle of steps, and the inner wall of the first locking member is provided with a groove matching the steps, so that the first locking member can be mounted on the steps, and the first locking member can be pressed on the steps to enable the first locking member and the driving member to be rotationally coupled.

[0032] In order to achieve the above purpose, another technical solution adopted by this application is:

[0033] A pipette is provided, characterized in that it comprises the range locking mechanism described in any one of the above embodiments.

[0034] Different from the prior art, the beneficial effects of this application are:

[0035] The range locking mechanism of the present application realizes the rotation locking of the plunger rod by the meshing cooperation of the first locking member and the second locking member, and the rotation locking or unlocking of the plunger rod can be realized by controlling the second locking member to fit with the first locking member or to disengage from the first locking member, thereby effectively avoiding the problem of locking drift caused by locking methods such as friction and clamping;

[0036] The range locking mechanism of the present application has a simple structure and is easy to operate, which helps to free up operators and reduce difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0038] Figure 1 It is a schematic structural diagram of an embodiment of the range locking mechanism of the pipette of the present application;

[0039] Figure 2 It is a schematic cross-sectional structural diagram of an embodiment of the range locking mechanism of the pipette of the present application after assembly;

[0040] Figure 3 It is a three-dimensional structural diagram of an embodiment of the second locking member of the present application;

[0041] Figure 4 It is a schematic structural diagram of an embodiment of the range locking mechanism when the second locking member of the present application is in the unlocked posture;

[0042] Figure 5 It is a three-dimensional structural diagram of an embodiment of the limiting member of the present application;

[0043] Figure 6 It is a schematic cross-sectional structural diagram of an embodiment of the limiting member of the present application;

[0044] Figure 7 It is a three-dimensional structural diagram of an embodiment of the actuator of the present application;

[0045] Figure 8 It is a front view structural diagram of an embodiment of the actuator of the present application;

[0046] Figure 9 It is a structural diagram of an embodiment of the operating member of the present application;

[0047] Figure 10 It is a schematic structural diagram of an embodiment of the execution unit of the present application after assembly;

[0048] Figure 11 It is a schematic structural diagram of an embodiment of the pipette of the present application

[0049] Main reference numeral description:

[0050] Driver 10; through hole 101; step 102; flange 103;

[0051] Plunger rod 20;

[0052] The first locking member 30; the groove 301; the first locking surface 302; the first engaging tooth 303;

[0053] The second locking member 40; the second locking surface 401; the second engaging tooth 402; the pressed part 403; the boss 404;

[0054] The upper cover assembly 50;

[0055] The execution unit 60;

[0056] The limiting member 70; the limiting hole 701; the limiting part 702; the first convex rib 703; the limiting surface 704; the third convex rib 705; the first guiding surface 706; the locking groove 707; the guiding groove 708;

[0057] The executing member 80; the execution end 801; the locking part 802; the second convex rib 803; the locking surface 804; the notch 805;

[0058] The operating member 90; the saw teeth 901; the second guiding surface 902; the guiding block 903; the elastic arm 904; the elastic space 905;

[0059] The volume bolt 100;

[0060] The retaining spring 110. Detailed implementation manners

[0061] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0062] Since users may need to aspirate various different liquid volumes with a pipette, pipettes usually provide different volume ranges and adjustability within the selected volume range. The volume adjustability is usually achieved in the following way: manually rotating the set volume setting shaft or manually rotating the plunger operation button of the pipette and the associated plunger so as to cause a change in the volume setting of the pipette through one of a variety of possible associated mechanisms.

[0063] In order to achieve the range locking after the volume adjustment is completed, pipettes usually also provide a range locking device for locking the plunger or related structures. At present, the range locking device usually adopts the method of pressure locking of the driving parts or self-friction to achieve the range locking. However, the locking structure and the self-friction structure are prone to looseness during the process of aspirating liquid, thereby causing the rotation deviation of the driving member, and thus resulting in deviation of the experimental results.

[0064] To solve the above problems, the applicant has developed a new type of pipette range locking mechanism. This range locking mechanism engages and locks the plunger rod by means of meshing teeth, avoiding the problem of locking drift caused by methods such as friction and clamping. At the same time, the structure is simple and the operation is convenient, which helps to liberate the operator and reduce the difficulty.

[0065] Specifically, please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an embodiment of the range locking mechanism of the pipette of the present application.

[0066] As Figure 1 shown, the range locking mechanism includes a driving member 10. The driving member 10 is used to be rotationally coupled with the plunger rod, that is, the driving member 10 and the plunger rod are locked to each other in the rotational direction. At the same time, the plunger rod can also move axially relative to the driving member 10. Thus, it can be realized that when the plunger rod is rotated to drive the volume bolt to rotate so as to realize range adjustment, the driving member 10 will rotate synchronously; and when the plunger rod is axially moved to realize the suction operation of a certain volume of liquid, the driving member 10 will remain stationary and will not interfere with the axial movement of the plunger rod 20.

[0067] Therefore, by locking the rotational movement of the driving member 10, the rotational movement of the plunger rod can be locked, and finally the range locking of the pipette can be realized.

[0068] In one embodiment, the rotational coupling between the driving member 10 and the plunger rod can be realized by at least part of the plunger rod 20 having a non-circular design, such as square, pentagonal, hexagonal, etc. A through hole is formed inside the driving member 10 or inside a fixing member rotationally coupled with the driving member 10, and at least part of the cross-section of the hole is a non-circular structure matching the plunger rod. The plunger rod passes through the hole, thereby realizing the rotational coupling between the two.

[0069] Specifically, please refer to Figure 2 , Figure 2 which is a cross-sectional structural diagram of an embodiment after the range locking mechanism of the pipette of the present application is assembled. As shown in the figure, the driving member 10 can be pressed by the upper cover assembly 50, so that the driving member 10 is rotationally coupled with the upper cover assembly 50. A through installation hole 501 is formed inside the upper cover assembly 50, and the cross-section of the installation hole 501 can be hexagonal. A through hole 101 is formed inside the driving member 10.

[0070] The plunger rod 20 passes through the installation hole 501 and the through hole 101, and the cross-section of the part of the plunger rod 20 in contact with the installation hole 501 can be a hexagonal structure matching the installation hole 501, thereby realizing the rotational coupling between the plunger rod 20 and the driving member 10.

[0071] Of course, in other embodiments, the driving member 10 and the plunger rod 20 can also be rotationally coupled in other ways. For example, a protruding structure can be provided on the outer wall of the plunger rod 20, and an axially extending chute matching the protruding structure can be provided on the hole wall of the through hole 101 of the driving member 10 or the hole wall of the mounting hole 501 of the upper cover assembly 50, so that the plunger rod 20 and the driving member 10 are rotationally coupled and can move relative to each other axially. Or other common structural designs in the art can all achieve the effects of this embodiment.

[0072] As Figure 1 shown, the range locking mechanism further includes a first locking member 30 and a second locking member 40 sleeved on the driving member 10. The first locking member 30 can be rotationally coupled with the driving member 10, and the second locking member 40 can be movably arranged along the first direction Z.

[0073] Specifically, the second locking member 40 includes a locking posture and an unlocking posture. When the second locking member 40 is in the locking posture, the second locking member 40 and the first locking member 30 are tightly attached and rotationally coupled. When the second locking member 40 is in the unlocking posture, the second locking member 40 is separated from the first locking member 30.

[0074] It can be understood that when the second locking member 40 is in the locking posture, the second locking member 40 can be rotationally coupled with the first locking member 30. At the same time, the first locking member 30 is rotationally coupled with the driving member 10, and the driving member 10 is rotationally coupled with the plunger rod 20, so that the plunger rod 20 can be locked in the rotational direction to achieve range locking. When the second locking member 40 is in the unlocking posture, the first locking member 30 is not rotationally coupled with the second locking member 40. At this time, the plunger rod 20 can rotate to drive the rotation of the volume bolt 100 to achieve range adjustment, and the synchronous driving rod and the first locking member 30 can follow the rotation of the plunger rod 20.

[0075] In one embodiment, the first locking member 30 can be rotationally coupled with the driving member 10 by being pressed on the driving member 10. Specifically, please refer to Figure 2 , a circle of steps 102 can be provided on the outer peripheral surface of the driving member 10, and a groove 301 matching the steps 102 is provided on the inner wall of the first locking member 30, so that the first locking member 30 is sleeved and installed on the steps 102.

[0076] In one embodiment, the first locking member 30 can be pressed on the steps 102 by the upper cover assembly 50 assembled to the pipette, so that the first locking member 30 and the driving member 10 are rotationally coupled.

[0077] Currently, in other embodiments, the first locking member 30 may be integrally formed with the driving member 10 to achieve rotational coupling between the first locking member 30 and the driving member 10. Alternatively, the first locking member 30 may also be fixedly arranged with the driving member 10 through a snap structure or the like to achieve rotational coupling between the first locking member 30 and the driving member 10, both of which can achieve the effects of this embodiment.

[0078] Please refer to Figure 1 and Figure 3 , Figure 3 which is a schematic three-dimensional structure diagram of an embodiment of the second locking member of the present application. As shown in Figure 1 and Figure 3 , in this embodiment, the first locking member 30 includes a first locking surface 302 facing the second locking member 40, and a circle of first engaging teeth 303 is arranged on the first locking surface 302.

[0079] The second locking member 40 includes a second locking surface 401 facing the first locking surface 302, and a circle of second engaging teeth 402 matching the first engaging teeth 303 is arranged on the second locking surface 401.

[0080] When the second locking member 40 is in the locked posture, the first locking surface 302 and the second locking surface 401 are in contact with each other, so that the second engaging teeth 402 are engaged with the second engaging teeth 402 to lock the first locking member 30 and the second locking member 40 in the rotational direction, thereby realizing rotational locking of the driving member 10 and the plunger rod 20.

[0081] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of an embodiment of the range locking mechanism when the second locking member of the present application is in the unlocked posture. When the second locking member 40 is in the unlocked posture, the first locking surface 302 and the second locking surface 401 are separated from each other, thereby releasing the rotational locking of the first locking member 30.

[0082] In other embodiments, the first locking member 30 and the second locking member 40 may also adopt other structures to achieve contact locking, such as a snap structure or the like, which can also achieve the effects of this embodiment.

[0083] To ensure the fitting stability between the first locking member 30 and the second locking member 40 and simultaneously realize the automatic reset of the second locking member 40 from the unlocked posture to the locked posture, the range locking mechanism further includes a retaining spring 110. The retaining spring 110 is arranged between one end of the driving member 10 and the second locking member 40, and the retaining spring 110 is used to drive the second locking member 40 to move towards the first locking member 30.

[0084] Specifically, for the convenience of arranging the retaining spring 110, in this embodiment, a ring of flange 103 is further provided on the outer peripheral surface of one end of the driving member 10 away from the first locking member 30. The retaining spring 110 is sleeved on the driving member 10, with one end mounted on the flange 103 and the other end mounted on the second locking member 40.

[0085] For the convenience of operating the second locking member 40, the second locking member 40 further includes a pressure-receiving portion 403. The range locking mechanism further includes an execution unit 60 for driving the movement of the second locking member 40 in the first direction Z, so as to drive the second locking member 40 to switch from the locked posture to the unlocked posture.

[0086] Specifically, as Figure 1 and Figure 3 shown, the execution unit 60 may include an execution end 801 located on one side of the pressure-receiving portion 403 in the first direction Z. The execution unit 60 drives the execution end 801 to move along the first direction Z, so that the execution end 801 abuts against the pressure-receiving portion 403 to drive the second locking member 40 to move along the first direction Z.

[0087] To ensure the contact stability between the execution end 801 and the pressure-receiving portion 403 and avoid dislocation when the execution end 801 drives the pressure-receiving portion 403 to move, in this embodiment, a notch 805 is further provided on the end face of the execution end 801 of the execution member 80, and a boss 404 matching the notch 805 is provided on the surface of the pressure-receiving portion 403 facing the execution end 801. When the execution end 801 abuts against the pressure-receiving portion 403, the boss 404 extends into the notch 805, so as to ensure the stable contact between the pressure-receiving portion 403 and the execution end 801.

[0088] It can be understood that the state switching of the second locking member 40 between the locked posture and the unlocked posture can be realized through the linear telescopic movement of the execution unit 60, so as to realize the rotational locking and unlocking of the plunger rod 20. Among them, the execution unit 60 can adopt any telescopic structure commonly used in the art, such as an electric telescopic rod, etc., which can all realize the locking and unlocking operations of the range.

[0089] In one embodiment, in order to simplify the structure of the pipette and facilitate the operation of the operator, the execution unit 60 in the art can adopt a push-button structure, and the second locking member 40 can be switched between the unlocked posture and the locked posture once by the operator's one-time pressing. The structure of the execution unit 60 in an embodiment of the present application will be introduced in detail below.

[0090] As Figure 1 and Figure 4As shown, the execution unit 60 includes a limiting member 70 and an execution member 80. Among them, the limiting member 70 is arranged on one side of the pressure-receiving part 403 in the first direction Z. There is a through limiting hole 701 inside the limiting hole 701. The limiting hole 701 extends along the first direction Z, and a limiting portion 702 is provided on the inner wall of the limiting hole 701;

[0091] The execution member 80 is movably arranged in the limiting hole 701. An execution end 801 is provided at one end of the execution member 80 facing the pressure-receiving part 403. A locking portion 802 that can cooperate with the limiting portion 702 to lock the position of the execution member 80 is provided on the execution member 80;

[0092] Among them, when the locking portion 802 cooperates with the limiting portion 702 to lock, the execution end 801 can extend out of the limiting hole 701 to abut against the pressure-receiving part 403, so as to limit the second locking member 40 in the unlocked posture. When the locking portion 802 disengages from the limiting portion 702, the execution end 801 can contract into the limiting hole 701, so that the second locking member 40 can be reset to the locked posture.

[0093] The operator can realize the posture switching of the second locking member 40 by manipulating the movement of the execution member 80 inside the limiting hole 701.

[0094] It should be noted that in the above embodiment, when the second locking member 40 is in the unlocked posture, the execution end 801 extends out of the limiting hole 701. When the second locking member 40 is in the locked posture, the execution end 801 contracts back into the limiting hole 701. In other embodiments, the execution end 801 can also always be located inside the limiting hole 701, or can also always be located outside the limiting hole 701.

[0095] Exemplarily, in another embodiment, the height of the convex platform 403 located at the pressure-receiving part 401 is set high enough so that when the second locking member 40 is in the unlocked posture, the convex platform 403 can extend into the limiting hole 701 to abut against the execution end 801. At this time, the execution end 801 can always move inside the limiting hole 701. In yet another embodiment, the distance between the pressure-receiving part 401 and the limiting hole 701 is set far enough so that when the second locking member 40 is in the locked posture, the convex platform 403 still cannot be inserted into the limiting hole 701, and the execution end 801 can also always move outside the limiting hole 701. As long as the telescopic movement of the execution end 801 can control the second locking member 40 to switch between the unlocked posture and the locked posture, the effects of this embodiment can be achieved, and no limitation is made here.

[0096] The structures of the limiting member 70 and the execution member 80 will be introduced in detail below. Please refer to Figure 1 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 andFigure 8 , Figure 5 is a schematic three - dimensional structure diagram of an embodiment of the limiting member of the present application, Figure 6 is a schematic cross - sectional structure diagram of an embodiment of the limiting member of the present application, Figure 7 is a schematic three - dimensional structure diagram of an embodiment of the actuator of the present application, Figure 8 is a schematic front - view structure diagram of an embodiment of the actuator of the present application.

[0097] The limiting portion 702 includes first convex ribs 703 uniformly and spacedly arranged on the inner wall of the limiting hole 701. The first convex ribs 703 extend along the first direction Z, and a limiting surface 704 is provided on one end surface of the first convex ribs 703 facing the pressure - receiving portion 403.

[0098] The locking portion 802 includes second convex ribs 803 uniformly and spacedly arranged on the outer wall of the actuator 80. The second convex ribs 803 extend along the first direction Z, and a locking surface 804 is provided on one end surface of the second convex ribs 803 facing away from the pressure - receiving portion 403;

[0099] Wherein, the locking surface 804 and the limiting surface 704 can be cooperatively abutted to lock the position of the actuator 80.

[0100] Based on the above structure, when an operator needs to adjust the range, the operator can control the actuator 80 to move axially and rotate circumferentially so that the locking surface 804 and the limiting surface 704 are abutted to lock the position of the actuator 80; when the operator needs to lock the range, the operator can control the actuator 80 to rotate circumferentially so that the locking surface 804 and the limiting surface 704 are separated to unlock the position of the actuator 80.

[0101] In one embodiment, as shown in Figure 1 and Figure 4 , in order to facilitate the operator to manipulate the actuator 80, the actuating unit 60 may further include a manipulating member 90. The manipulating member 90 is arranged in the limiting hole 701, and the manipulating member 90 is sleeved on the side of the actuator 80 facing away from the pressure - receiving portion 403. The manipulating member 90 is used to drive the actuator 80 to move in the first direction Z and circumferentially so that the locking surface 804 can be cooperatively abutted against or separated from the limiting surface 704.

[0102] Specifically, please refer to Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 9 , Figure 9 is a schematic structure diagram of an embodiment of the manipulating member of the present application.

[0103] The limiting portion 702 further includes third convex ribs 705 arranged on both sides of each first convex rib 703. The third convex ribs 705 extend along the first direction Z, and a first guiding surface 706 that is inclined relative to the circumferential direction is provided on an end surface of the third convex rib 705 facing the pressure-receiving portion 403. The first guiding surface 706 is integrally connected to the limiting surface 704. A locking groove 707 is formed between each third convex rib 705 and the adjacent third convex rib 705 on one side.

[0104] An end surface of the operating member 90 facing the pressure-receiving portion 403 is provided with a ring of saw teeth 901, and the saw teeth 901 include a second guiding surface 902 that is inclined relative to the circumferential direction.

[0105] Wherein, the saw teeth 901 are used to abut against the locking surface 804 and drive the actuating member 80 to disengage from the limiting surface 704 when the operating member 90 moves towards the pressure-receiving portion 403. The second guiding surface 902 is used to guide the actuating member 80 to the first guiding surface 706 by abutting against the locking surface 804, and the first guiding surface 706 is used to guide the actuating member 80 to the limiting surface 704 or the locking groove 707 by abutting against the locking surface 804.

[0106] It can be understood that by driving the movement of the limiting portion 702 in the first direction Z, the operator can achieve the fitting and locking of the locking surface 804 of the actuating member 80 and the limiting surface 704, and the disengagement of the locking surface 804 of the actuating member 80 from the limiting surface 704 and the reset and embedding into the locking groove 707.

[0107] To limit the moving direction of the operating member 90 and avoid circumferential rotational movement when the operating member 90 moves, please refer to Figure 5 and Figure 9 , a plurality of guiding blocks 903 are evenly spaced on the outer wall of the operating member 90, and the guiding blocks 903 extend along the first direction Z.

[0108] The thickness of the third convex rib 705 on the inner wall of the limiting member 70 is greater than that of the first convex rib 703, so that a guiding groove 708 is formed between the third convex ribs 705 on both sides of each first convex rib 703.

[0109] Each guiding block 903 is embedded in the corresponding guiding groove 708 or locking groove 707, thereby limiting that the operating member 90 can only move axially.

[0110] The working process of the execution unit 60 of the above embodiment of the present application will be introduced in detail below:

[0111] In the initial state, the second convex rib 803 of the actuating member 80 is embedded in the locking groove 707, and the second locking surface 401 of the second locking member 40 is in fitting and locking with the first locking surface 302 of the first locking member 30, so that the driving member 10 and the plunger rod 20 are locked in the rotational direction and are in the range locking state;

[0112] When the range needs to be adjusted, the operator can press the operating member 90. The serrations 901 of the operating member 90 abut against the locking surface 804 of the second convex rib 803 of the actuator 80, thereby driving the actuator 80 to move towards the pressed portion 403. Synchronously, the actuator end 801 of the actuator 80 abuts against the pressed portion 403 of the second locking member 40, driving the second locking member 40 to disengage from the first locking member 30; until the second convex rib 803 of the actuator 80 disengages from the locking groove 707. At this time, under the guiding action of the second guiding surface 902 of the serrations 901, the actuator 80 rotates so that the locking surface 804 of the second convex rib 803 fits against the first guiding surface 706 of the third convex rib 705 on the inner wall of the limiting hole 701. At this time, the operator can stop pressing the operating member 90; under the guiding action of the first guiding surface 706, the actuator 80 continues to rotate until the locking surface 804 of the second convex rib 803 fits against the limiting surface 704 of the first convex rib 703 on the inner wall of the limiting hole 701. At this time, the position of the actuator 80 is limited, and at the same time, the second locking member 40 is limited at the separated position from the first locking member 30, being in the range unlocking state. At this time, the operator can control the rotation of the plunger rod 20 to achieve range adjustment;

[0113] When the range adjustment is completed, the operator can press the operating member 90. The operating member 90 moves towards the direction of the pressed portion 403 until the serrations 901 of the operating member 90 abut against the locking surface 804 of the second convex rib 803 of the actuator 80, thereby driving the actuator 80 to disengage from the limiting surface 704 of the first convex rib 703 on the inner wall of the limiting hole 701. At this time, under the guiding action of the second guiding surface 902 of the serrations 901, the actuator 80 rotates so that the locking surface 804 of the second convex rib 803 fits against the first guiding surface 706 of the third convex rib 705 on the inner wall of the limiting hole 701. At this time, the operator can stop pressing the operating member 90; under the guiding action of the first guiding surface 706, the actuator 80 continues to rotate until the second convex rib 803 rotates to the position of the locking groove 707. Under the elastic force of the retaining spring 110, the actuator 80 moves in the direction away from the pressed portion 403 and slides into the locking groove 707. Synchronously, the second locking member 40 resets to the position where it is in close contact with the first locking member 30, so that the driving member 10 and the plunger rod 20 are locked in the rotational direction, being in the range locking state.

[0114] Through the above structural design of the execution unit 60, the rapid switching between the unlocking and locking states can be realized through the organic cooperation of the actuator 80 and the operating member 90. At the same time, the operation is simple, and the operator can achieve a state switch by pressing the operating member 90 once.

[0115] In the above embodiment, the operating member 90 stays at the current position after moving into place. When the operator presses it next time, the operator needs to control the operating member 90 to continue pressing at the current position, which may cause the operating member 90 to stay at different positions when the second locking member 40 is in the locked posture and the unlocked posture. In particular, when the second locking member 40 is in the unlocked posture, the operating member 90 may stay at a deeper position inside the limit hole 701, which is not conducive to the pressing operation of the operator.

[0116] To solve the above problems, in this embodiment, an optimized design is also made for the operating member 90. Specifically, please refer to Figure 1 、 Figure 4 and Figure 10 , Figure 10 which is a schematic structural diagram of a subsequent embodiment after the execution unit of the present application is assembled.

[0117] Three elastic arms 904 are arranged at one end of the operating member 90 away from the execution member 80 at uniform intervals. The elastic arms 904 extend along the first direction Z, and the three elastic arms 904 enclose an elastic space 905. When the operating member 90 drives the execution member 80 to move, the execution member 80 is embedded in the elastic space 905 and expands the elastic arms 904 outward, so that after the execution member 80 moves into place, the operating member 90 can reset under the elastic action of the elastic arms 904.

[0118] Based on the above structural design, when the operator presses the operating member 90 and releases it after moving into place, the operating member 90 can automatically reset to the initial position under the elastic action of the elastic arms 904, which is convenient for the subsequent pressing operation of the operator.

[0119] The present application also provides a pipette. Please refer to Figure 11 , Figure 11 which is a schematic structural diagram of an embodiment of the pipette of the present application. As Figure 11 shown, the pipette includes a plunger rod 20, a volume bolt 100, and the range locking mechanism of the above embodiment.

[0120] The plunger rod 20 is arranged through the through hole 101 of the driving member 10 of the range locking mechanism, and the plunger rod 20 is rotationally coupled with the driving member 10. The volume bolt 100 is sleeved on the plunger rod 20 and is threadedly connected to the plunger rod 20. Thus, when the plunger rod 20 is rotated, the volume bolt 100 is driven to move axially, so as to limit the maximum axial displacement of the plunger rod 20 and achieve the purpose of adjusting the range.

[0121] For those skilled in the art, it is obvious that the present application is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present application, the present application can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present application is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present application. Any reference signs in the claims should not be construed as limiting the claims involved.

[0122] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A range locking mechanism for a pipette, characterized in that, include: A driving member, used for rotationally coupling with the plunger rod; A first locking member, sleeved on the driving member, wherein the first locking member can be configured to be rotationally coupled with the driving member; a second locking member, sleeved on the driving member, the second locking member being movable along the first direction so that the second locking member can switch between a locked position and an unlocked position, when the second locking member is in the locked position, the second locking member and the first locking member are tightly rotationally coupled, and when the second locking member is in the unlocked position, the second locking member is separated from the first locking member; an execution unit, configured to drive the second locking member to move in the first direction, so that the second locking member switches between the locking posture and the unlocking posture; Wherein, the first direction is the axial direction of the driving member.

2. The range locking mechanism according to claim 1, characterized in that, The first locking member comprises a first locking surface facing the second locking member, and a circle of first meshing teeth is arranged on the first locking surface; The second locking member comprises a second locking surface facing the first locking surface, and a circle of second meshing teeth matching the first meshing teeth is arranged on the second locking surface; Wherein, when the second locking member is in the locking posture, the second meshing teeth mesh with the second meshing teeth to lock the first locking member and the second locking member in the rotational direction.

3. The range locking mechanism according to claim 1, characterized in that, The second locking member includes a pressure-bearing portion, and the executing unit includes an executing end located on one side of the pressure-bearing portion in the first direction. The executing unit drives the executing end to move along the first direction so that the executing end and the pressure-bearing portion abut against each other to drive the second locking member to move along the first direction.

4. The range locking mechanism according to claim 3, characterized in that, The execution unit comprises: A limiting member is arranged on one side of the pressure receiving portion in the first direction, a limiting hole is arranged inside the limiting member, the limiting hole is extended along the first direction, and a limiting portion is provided on an inner wall of the limiting hole; An actuator is movably arranged in the limiting hole, the actuator is provided with the actuator end at one end facing the pressure receiving portion, and the actuator is provided with a locking portion that can cooperate with the limiting portion to lock the position of the actuator; Among them, when the locking part and the limiting part cooperate to lock, the executing end abuts against the pressed part to limit the second locking member in the unlocking posture. When the locking part is separated from the limiting part, the executing end can move in the direction away from the pressed part so that the second locking member can be reset to the locking posture.

5. The range locking mechanism according to claim 4, characterized in that, The limiting portion includes first ridges evenly spaced on the inner wall of the limiting hole, the first ridges extending along the first direction, and a limiting surface is provided on one end surface of the first ridge facing the pressure receiving portion; The locking portion comprises second ridges evenly spaced on the outer wall of the actuator, the second ridges extending along the first direction, and a locking surface is provided on an end surface of the second ridge away from the pressure receiving portion; The locking surface and the limiting surface can cooperate with each other to lock the position of the actuator.

6. The range locking mechanism according to claim 5, characterized in that, The execution unit also includes an operating member, which is arranged in the limiting hole and sleeved on the side of the actuator away from the pressure-bearing portion. The operating member is used to drive the actuator to move in the first direction and circumferential direction so that the locking surface can cooperate with the limiting surface or can be separated from the limiting surface.

7. The range locking mechanism according to claim 6, characterized in that, The limiting portion further includes third ridges arranged on both sides of each of the first ridges, the third ridges extending along the first direction, and a first guide surface inclined relative to the circumferential direction is provided on one end surface of the third ridge facing the pressure-bearing portion, the first guide surface is connected to the limiting surface as a whole, and a locking groove is formed between each of the third ridges and the third ridge on the adjacent side; The operating member is provided with a circle of saw teeth on one end surface facing the pressure receiving portion, and the saw teeth include a second guide surface which is arranged obliquely relative to the circumferential direction; Among them, the serrations are used to abut against the locking surface and drive the actuator to separate from the limiting surface when the operating member moves toward the pressure-bearing portion, the second guide surface is used to guide the actuator to the first guide surface by abutting against the locking surface, and the first guide surface is used to guide the actuator to the limiting surface or the locking groove by abutting against the locking surface.

8. The range locking mechanism according to claim 7, characterized in that, The thickness of the third ridge is greater than that of the first ridge, so that a guide groove is formed between the third ridges on both sides of each of the first ridges. A plurality of guide blocks are evenly spaced apart on the outer wall of the operating member, and the guide blocks extend along the first direction, and the guide blocks are embedded in the guide groove or the locking groove to limit the moving direction of the operating member.

9. The full-scale locking mechanism according to claim 7, characterized in that, The operating member is provided with a plurality of elastic arms evenly spaced apart at one end away from the actuator, the elastic arms extend along a first direction, and the plurality of elastic arms surround an elastic space. When the operating member drives the actuator to move, the actuator is embedded in the elastic space and the elastic arms are stretched outward, so that after the actuator moves into place, the operating member can be reset under the elastic action of the elastic arms.

10. The range locking mechanism according to claim 4, characterized in that, The end surface of the execution end of the execution member is provided with a notch, and the side of the pressure-bearing portion facing the execution member is provided with a boss matching the notch.

11. The range locking mechanism according to claim 1, characterized in that, It also includes a storage spring, which is arranged between one end of the driving member and the second locking member, and is used to drive the second locking member to move toward the first locking member.

12. The range locking mechanism according to claim 1, wherein The outer circumference of the driving member is provided with a circle of steps, and the inner wall of the first locking member is provided with a groove matching the steps, so that the first locking member can be sleeved and installed on the steps, and the first locking member can be pressed on the steps to make the first locking member and the driving member rotationally coupled.

13. A pipette, characterized in that, It comprises the range locking mechanism described in any one of claims 1 to 12.

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