CN117244602B - Integrated external piston pipette suction head - Google Patents
Integrated external piston pipette suction head Download PDFInfo
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- CN117244602B CN117244602B CN202311270271.4A CN202311270271A CN117244602B CN 117244602 B CN117244602 B CN 117244602B CN 202311270271 A CN202311270271 A CN 202311270271A CN 117244602 B CN117244602 B CN 117244602B
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- suction head
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- cavity
- pipe body
- head pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
- B01L3/0213—Accessories for glass pipettes; Gun-type pipettes, e.g. safety devices, pumps
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Abstract
The invention relates to the technical field of pipette tip manufacturing, in particular to an integrated external piston pipette tip. The suction head comprises a suction head pipe body, a piston part is arranged in the suction head pipe body, a piston sliding cavity is arranged in the suction head pipe body, the piston part comprises a pushing section which is matched with the radial size of the piston sliding cavity, a forming cavity is arranged on one side of the piston sliding cavity, which is far away from the outlet end of the suction head pipe body, the forming cavity is larger than the pushing section in radial size and axial size, a piston rod penetrating cavity is arranged at one end of the forming cavity, which is far away from the piston sliding cavity, the piston rod penetrating cavity corresponds to the bottom opening of the suction head pipe body, and the radial size of the pushing section is larger than the piston rod penetrating cavity; an extension section is arranged at one end of the pushing section, which is close to the piston rod penetrating cavity, and the radial dimension of the extension section is smaller than that of the piston rod penetrating cavity, and the extension section can extend out of the bottom of the suction head pipe body; the suction head pipe body is an integral piece. The suction head pipe body and the piston part can be integrally formed, so that the assembly cost of parts is saved.
Description
Technical Field
The invention relates to the technical field of pipette tip manufacturing, in particular to an integrated external piston pipette tip.
Background
The external piston pipette tip is formed by assembling a tip tube body and a piston part, and in order to prevent pollution inside the tip tube body, the production and the assembly of the pipette tip have high requirements on the environmental cleanliness, so the external piston pipette tip is required to be assembled on the tip tube body and the piston part in a high-clean environment before leaving a factory. The manufacturing cost of the suction head of the external piston pipette is increased whether the automatic assembly or the manual assembly is performed. Therefore, the unit price of the external piston pipette tip is too high as a whole. The proposal for reducing the production cost of the suction head of the external piston pipette needs to be pushed out.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the suction head of the integrally formed external piston pipette, and the suction head pipe body and the piston part can be integrally formed, so that the assembly cost of parts is saved.
In order to achieve the above object, the present invention is realized by the following technical scheme:
The utility model provides an external piston pipettor suction head of integrated into one piece, includes the suction head body, be equipped with the piston portion in the suction head body, be equipped with the piston sliding chamber in the suction head body, the piston portion includes the bulldozing section that suits with piston sliding chamber radial dimension, piston sliding chamber is equipped with the shaping appearance chamber far away from the exit end one side of suction head body, shaping Rong Qiangjing is greater than bulldozing section to size and axial dimension, shaping appearance chamber is kept away from piston sliding chamber one end and is equipped with the piston rod and wears the chamber, the piston rod wears the chamber and corresponds suction head body bottom opening, bulldozing section radial dimension is greater than the piston rod and wears the chamber; an extension section is arranged at one end of the pushing section, which is close to the piston rod penetrating cavity, and the radial dimension of the extension section is smaller than that of the piston rod penetrating cavity, and the extension section can extend out of the bottom of the suction head pipe body; the suction head pipe body is an integral piece.
Based on the above structure, the integrally formed external piston pipette tip of the present application, the piston part and the tip tube body may be formed in one step by additive manufacturing, specifically, the tip tube body and the piston part may be integrally formed by using a 3D printing additive process, specifically, nylon materials may be used as an example, and a Selective Laser Sintering (SLS) or thermal extrusion (FDM) forming process may be used. According to the printing model of the integrated external piston pipette suction head, the piston part is arranged in the suction head tube body, the pushing section is integrally arranged in the forming cavity, a gap exists between the pushing section and the inner wall of the forming cavity, the printing model is axially and vertically arranged corresponding to the horizontal plane of the printing platform, one side, close to the piston rod cavity, of the printing model faces the printing platform, and the extending section is vertically arranged on the printing platform. So accessible 3D prints material adding technology shaping technique, realizes the integrated into one piece of suction head body and piston portion, after the shaping piston portion set up in the shaping appearance intracavity of piston smooth chamber promptly to because the spacing effect in piston rod through-hole, piston portion can't drop out from suction head body tail end, can guarantee that the lumen and the piston portion of suction head body are not polluted. During operation, the pushing section is pressed into the piston sliding cavity, and the piston part is axially moved, so that the suction head can absorb or discharge liquid. Therefore, compared with the traditional split molding technology, the integrated external piston pipette suction head disclosed by the application omits the assembly cost of parts.
Furthermore, according to the integrally formed external piston pipette tip, the bottom of the extension section is provided with the connecting structure, and the connecting structure is used for connecting an external piston rod. As the preferable scheme of the application, the bottom of the pushing section is required to be provided with the piston rod, the traditional piston rod and the pushing section are integrally formed, but when the 3D printing additive forming is carried out, as the pushing section is arranged in the forming accommodating cavity at the lower end of the piston sliding cavity in the 3D printing forming model, if the piston rod and the pushing section are integrally formed, the height of a printing forming part is overlarge, on one hand, the stability is poor during forming, the perpendicularity of a forming product is difficult to ensure, and on the other hand, the production efficiency is influenced. In the application, the piston part and the piston rod are in a split design, and the connecting structure at the bottom of the extension section is used for connecting with the piston rod, wherein the piston rod can be preinstalled or integrally arranged on the pipettor, and can also be a single rod piece connected with the extension section. It should be noted that, because the piston rod itself does not contact with the inner wall of the sliding cavity of the piston, the connection between the piston rod and the extension section does not need to be an external piston pipette tip integrally formed with the piston head as in the conventional piston rod, and it is necessary to install the external piston pipette tip in advance in a high-cleanliness environment before shipping. Therefore, the integrally formed external piston pipette tip disclosed by the application has the advantages that the design of the piston rod and the piston part body is adopted, the piston rod and the piston part body are not required to be installed in advance before delivery, and the piston pipette tip is not inconsistent with the beneficial effect of saving the assembly cost of parts. In particular, the piston rod may be self-installed by the user in the form of a fitting.
Furthermore, according to the integrated external piston pipette tip disclosed by the application, a transition inclined plane is arranged between the pushing section and the extending section. As a preferable scheme of the application, the radial dimension of the extension section is smaller than that of the pushing section, if the interface of the pushing section and the extension section is a plane to form a step, a supporting structure is required to be arranged at the corresponding step when printing and forming is carried out, and after forming is completed, the supporting structure is required to be removed, so that the production efficiency is affected. According to the application, by arranging the transition inclined plane, the maximum inclined angle of the inclined plane is smaller than the limit angle of the support structure, so that the support structure is not required to be arranged in the forming process, and the production efficiency is improved.
Furthermore, the integrated external piston pipette tip provided by the application has the advantages that the boss protruding out of the side wall is arranged on the outer side of the tip tube body in an extending manner, the boss is provided with the limiting clamping piece, the side wall of the tip tube body corresponding to the limiting clamping piece is provided with the penetrating hole, the penetrating hole is communicated with the forming cavity, and the integrated external piston pipette tip further comprises the pressing piece, and the pressing piece is used for pressing the limiting clamping piece to enable the front end of the pressing piece to penetrate through the penetrating hole and enter the forming cavity;
The side wall of the pushing section is provided with a first groove part which is matched with the front end of the limiting clamping piece, and when the front end of the limiting clamping piece enters the first groove part to be matched with the first groove part, the piston part is axially locked. As a preferable scheme of the application, the extension section is required to be axially connected with the external piston rod, and in order to prevent the piston part from being moved by axial force in the process, the axial locking of the piston part can be realized through the limit fit of the limit clamping piece and the first groove part.
Further, according to the integrally formed suction head of the external piston pipette, the bottom of the forming cavity is provided with the limiting joint surface, and when the bottom end of the pushing section is contacted with the limiting joint surface, the first groove part moves to a position matched with the front end of the limiting clamping piece. As a preferable mode of the application, before the front end of the limiting clamping piece is pressed into the first groove part, the piston part firstly falls to the bottom end of the pushing section to contact with the limiting joint surface, and the preset position is completed, so that the front end of the limiting clamping piece can be ensured to be pressed into the first groove part. At this time, the limiting joint surface plays a role in limiting the lower end of the piston.
Furthermore, according to the integrated external piston pipette tip disclosed by the application, the bottom of the limiting clamping piece is arranged on the outer side of the tip tube body, the whole limiting clamping piece extends obliquely upwards towards the axis core of the tip tube body, the front end of the limiting clamping piece is arranged on the outer side of the forming cavity under the condition of no external force, the pressing piece is arranged above the limiting clamping piece, the pressing piece can axially move along the side wall of the tip tube body, and the limiting clamping piece can be jacked to be bent until the front end of the limiting clamping piece penetrates through the penetration hole to enter the forming cavity in the axial moving process of the pressing piece towards the direction of the limiting clamping piece. According to the application, based on the structure, the limiting clamping piece and the suction head pipe body are integrally formed, and the inclination angle of the limiting clamping piece is smaller than the inclination angle of the pressed piece after being pressed downwards in a state of no external force, namely, the limiting clamping piece is in a smaller inclination angle in an original state, so that the 3D additive forming process can be met, and the limiting clamping piece and the suction head pipe body can be integrally formed conveniently.
Furthermore, the integrated external piston pipette tip is characterized in that the whole pressing piece is annular and sleeved on the outer side wall of the tip tube body and is in threaded connection with the outer side wall of the tip tube body, and an annular pressing table is arranged at the bottom end of the pressing piece. As a preferable scheme of the application, the number of the limiting clamping pieces is 3, and the limiting clamping pieces are uniformly arranged at intervals in the circumferential direction. The whole structure is simple, and the pressing piece can be rotated to simultaneously realize the extrusion of a group of limiting clamping pieces. The press-fitting member is provided separately from the suction head pipe body, but the press-fitting member is not required to be mounted on the suction head pipe body in advance before shipment. Is not inconsistent with the beneficial effect of the application that the assembly cost of the components is saved. Specifically, the press-fit member may be self-installed by a user in the form of a fitting.
Furthermore, according to the integrally formed external piston pipette tip disclosed by the application, the vertical section profile of the limiting clamping piece comprises an outer arc edge and an inner arc edge, the bottom width of the limiting clamping piece is larger than the top width, and the limiting clamping piece is integrally sickle-shaped. As the preferable scheme of the application, the limiting clamping piece is not easy to break when being pressed downwards, and has the advantage of good reliability.
Furthermore, according to the integrated external piston pipette tip, the bottom of the penetrating hole is provided with the limiting surface which is matched with the inner side surface of the limiting clamping piece. As a preferable scheme of the application, the limiting clamping piece is extruded by the pressing piece from top to bottom, and when the limiting clamping piece is bent to be attached to the limiting surface, the limiting clamping piece reaches a preset bending state, and the limiting surface is used for preventing the limiting clamping piece from being bent to be over-positioned, so that the limiting clamping piece is ensured to reach the preset bending state. Furthermore, according to the integrated external piston pipette suction head disclosed by the application, a group of annular grooves which are axially arranged at intervals are arranged on the side wall of the pushing section, which is in sliding fit with the piston sliding cavity. As a preferable scheme of the application, the pushing section slides in the piston sliding cavity to realize liquid extraction, so that the joint of the pushing section and the piston sliding cavity needs to ensure tightness, namely, the pushing section and the piston sliding cavity are in interference fit, and when the piston part is pushed to axially slide in the piston sliding cavity, the resistance is excessively high. In order to solve the problems, the annular groove is arranged, when the pushing section axially slides in the sliding cavity of the piston, the annular groove is used for providing a deformation space for plastic deformation of the sealing joint of the pushing section, so that the resistance of the pushing section is reduced when the pushing section slides in the sliding cavity of the piston.
The technical scheme can be seen that the invention has the following beneficial effects:
1. the application provides an integrally formed external piston pipette suction head, which can realize the integral forming of a suction head pipe body and a piston part by a 3D printing material adding process forming technology, wherein the piston part is arranged in a forming containing cavity of a piston sliding cavity after forming, and the piston part cannot fall out from the tail end of the suction head pipe body due to the limiting effect of a piston rod penetrating cavity, so that the pipe cavity and the piston part of the suction head pipe body are prevented from being polluted. During operation, the pushing section is pressed into the piston sliding cavity, and the piston part is axially moved, so that the suction head can absorb or discharge liquid. Therefore, compared with the traditional split molding technology, the integrated external piston pipette suction head disclosed by the application omits the assembly cost of parts.
2. The invention provides an integrally formed external piston pipette suction head, which can realize axial locking of a piston part through limit matching of a limit clamping piece and a first groove part, and the limit clamping piece and a suction head pipe body are integrally formed.
3. The invention provides an integrally formed suction head of an external piston pipette, wherein the whole pressing piece is annular and sleeved on the outer side wall of a suction head tube body and is in threaded connection with the outer side wall of the suction head tube body, and an annular pressing table is arranged at the bottom end of the pressing piece. The whole structure is simple, and the pressing piece can be rotated to simultaneously realize the extrusion of a group of limiting clamping pieces.
Drawings
FIG. 1 is a schematic view of a suction head pipe body according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is an enlarged partial view of the area A of FIG. 2;
FIG. 4 is a schematic structural view of a pressing member mounted on a suction head pipe body according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of FIG. 4;
FIG. 6 is an enlarged partial view of region B of FIG. 5;
FIG. 7 is a schematic view of a molded model of an integrally molded external piston pipette tip according to embodiment 2 of the present invention;
FIG. 8 is an enlarged partial view of region C of FIG. 7;
FIG. 9 is a schematic view of the engaging of the limiting clip with the first slot portion;
fig. 10 is a schematic view of the cooperation of the limiting clip and the limiting rim.
In the figure: 1-a suction head tube body; 11-piston slide chamber; 12-forming a cavity; 121-limiting joint surfaces; 13-piston rod cavity penetration; 14-boss; 15-limiting clamping pieces; 151-groove lack; 16-penetrating the hole; 161-limiting surface; 162-coupling; 17-a liquid outlet cavity;
21-a pushing section; 211-a first groove part; 212-an annular groove; 213-limit edges; 22-extension; 23-transition inclined plane; 24-conical extrusion head;
3-pressing the piece; 31-an annular pressing table.
Detailed Description
Quantitative suction head and tube body of external piston pipettor
Example 1
The function of quantitative suction of traditional pipetting tips mainly relies on a pipetting device to control the movement stroke, so that when the tips with different specifications are used, the corresponding volume of the piston stroke is required to be set before pipetting operation, and the operation is complicated. The suction head used by the external piston pipette is internally provided with the piston rod, so that the stroke of the piston rod can be limited to realize the effect of quantitative suction. The existing piston type quantitative suction head is provided with split type limiting parts in a suction head tube body as CN219150168U or CN218609462U, and the user can assemble the split type limiting parts by himself because the fine assembly process of the parts is tedious and the tube cavity is easy to pollute, so that the limiting parts are required to be assembled on the tube body in advance before leaving the factory, and the production cost is high.
As shown in fig. 1 to 6, the present embodiment provides a quantitative suction head tube body of an external piston pipette, including a suction head tube body 1, a set of limit clamping pieces 15 circumferentially spaced are integrally provided at the outer side of the suction head tube body 1, penetration holes 16 are provided corresponding to the side walls of the suction head tube body 1 of the limit clamping pieces 15, the penetration holes 16 are communicated with the tube cavity of the suction head tube body 1, the bottom of the limit clamping pieces 15 is provided at the outer side of the suction head tube body 1, and the integral limit clamping pieces 15 extend obliquely upwards towards the axial center of the suction head tube body 1;
The front end of the limiting clamping piece 15 is arranged outside the tube cavity of the suction head tube body 1 under the state of no external force,
The suction head further comprises a pressing piece 3 arranged on the outer side of the suction head tube body 1, and the pressing piece 3 is used for pressing the limiting clamping piece 15 to enable the front end of the limiting clamping piece to penetrate through the penetrating hole 16 and enter the tube cavity.
In this embodiment, the limiting clamp 15 is integrally disposed on the suction head tube body 1, and the suction head tube body 1 is pressed into the inner cavity of the suction head tube body 1 by the external pressing part 3, so as to realize axial limiting of the piston component in the cavity, thereby realizing the effect of quantitative suction. The pressing piece 3 is arranged outside the suction head pipe body 1 in a split mode and is not a limiting part directly contacted with the piston part, so that the suction head pipe body can be automatically arranged by a user after leaving a factory. Therefore, the installation cost of the quantitative tip can be saved, thereby improving the production efficiency and saving the manufacturing cost.
In this embodiment, the outer side of the suction head pipe body 1 is extended with a boss 14 protruding from the side wall, and the boss 14 is disposed at the bottom of the suction head pipe body 1. The bottom of the limiting clamping piece 15 is arranged on the boss 14.
Further, in this embodiment, as shown in fig. 5 and fig. 6, the pressing member 3 is disposed above the limiting clip member 15, the pressing member 3 may move axially along the sidewall of the suction head tube body 1, and the pressing member 3 may push the limiting clip member 15 to bend until the front end of the pressing member passes through the penetration hole 16 and enters the lumen in the process of moving axially toward the direction of the limiting clip member 15. Based on the above structure, the inclination angle of the limiting clamping piece 15 in the state of not being subjected to external force is smaller than the inclination angle of the pressed piece 3 after being pressed downwards, namely, the limiting clamping piece 15 is in a smaller inclination angle in the original state, so that the forming process of the 3D material increase can be satisfied, and the integral forming of the forming process of the 3D material increase is facilitated.
Further, in this embodiment, the pressing member 3 is integrally annular, and is sleeved on the outer side wall of the suction head pipe body 1, and is in threaded connection with the outer side wall of the suction head pipe body 1, an annular pressing table 31 is disposed at the bottom end of the pressing member 3, and the annular pressing table 31 is used for extruding the upper portion of the outer side of the limiting clamping member 15. The pressing piece 3 is convenient to install and convenient for a user to install by himself. The pressing piece 3 is rotated to simultaneously realize the extrusion of a group of limiting clamping pieces 15, and the limiting operation is simple and efficient. Specifically, the number of the limiting clamping pieces 15 is 3, and the limiting clamping pieces are circumferentially and uniformly arranged at intervals.
Further, in the embodiment, as shown in fig. 6, the outline of the outer edge of the vertical section of the contact surface of the annular pressing table 31 corresponding to the limiting clip 15 is a curve protruding toward the limiting clip 15. Because spacing fastener 15 extends the setting obliquely, annular pressfitting platform 31 is pushing down the in-process of spacing fastener 15, annular pressfitting platform 31 with spacing fastener 15 circumscribes each other, spacing fastener 15 wholly receives downward and inward pressure, thereby realizes spacing fastener 15 bends to predetermineeing the state.
Further, in connection with fig. 3, in this embodiment, the vertical section profile of the limiting clip 15 includes an outer arc edge and an inner arc edge, and the bottom width of the vertical section profile of the limiting clip 15 is greater than the top width, and the whole is sickle-shaped.
The limiting clamping piece 15 is not easy to break when being pressed downwards, and has the advantage of good reliability.
Further, in this embodiment, a groove 151 is formed in an outer arc surface of the limiting clip 15, the groove 151 extends along a width direction of the limiting clip 15 and penetrates through two sides of the width direction of the limiting clip 15, a vertical section of the groove 151 is arc-shaped, and the groove 151 is disposed outside the pressing member 3.
The notch 151 corresponds to the bending position of the limiting clamp 15, and the bending deformation position of the limiting clamp 15 is concentrated at the notch 151 to control the limiting clamp 15 to reach a preset bending state after being pressed.
Further, in this embodiment, as shown in fig. 6, a limiting surface 161 corresponding to the inner surface of the limiting clip 15 is provided at the bottom of the penetration hole 16. The limiting clamping piece 15 is extruded from top to bottom by the pressing piece 3, when the limiting clamping piece 15 is bent to be attached to the limiting surface 161, the limiting surface 161 is used for preventing the limiting clamping piece 15 from being bent and over-positioned, and the limiting clamping piece 15 is guaranteed to reach the preset bending state.
Further, in the present embodiment, as shown in fig. 3, the front end of the limiting clip 15 is located in the area of the insertion hole 16 in the initial state of not receiving the external force. That is, the front end of the limiting clamp 15 is placed in the side wall of the suction head pipe body 1 in the initial state, so that pollution caused by contact between the front end of the limiting clamp 15 and the outside can be effectively prevented.
Further, in this embodiment, the top wall of the penetration hole 16 extends to form a coupling portion 162, the coupling portion 162 extends downward to be connected with the outer side of the inner cavity section of the suction head tube body 1 after the limiting clip 15 is pressed down, and the limiting surface 161 is disconnected with the limiting clip 15 after the limiting clip 15 is pressed down and bent. The coupling part 162 can further prevent the limit clip 15 entering the inner cavity of the suction head tube body 1 from being polluted before use. The coupling part 162 is provided, and whether the tip body 1 is used can be recognized by whether the coupling part 162 is disconnected from the stopper 15, thereby preventing the tip body 1 from being repeatedly used.
Example 2
An integrated external piston pipette tip as shown in fig. 7 to 8, comprising an external piston pipette quantitative tip tube body as described in embodiment 1, wherein a piston part is arranged in the tip tube body 1, a piston sliding cavity 11 is arranged in the tip tube body 1, the piston part comprises a pushing section 21 corresponding to the radial dimension of the piston sliding cavity 11,
A forming cavity 12 is arranged on one side of the piston sliding cavity 11, which is far away from the outlet end of the suction head pipe body 1, the radial size and the axial size of the forming cavity 12 are larger than those of the pushing section 21, a piston rod penetrating cavity 13 is arranged at one end of the forming cavity 12, which is far away from the piston sliding cavity 11, the piston rod penetrating cavity 13 corresponds to the bottom opening of the suction head pipe body 1, and the radial size of the pushing section 21 is larger than that of the piston rod penetrating cavity 13;
an extension section 22 is arranged at one end of the pushing section 21 near the piston rod penetrating cavity 13, the radial size of the extension section 22 is smaller than that of the piston rod penetrating cavity 13, and the extension section 22 can extend out of the bottom of the suction head tube body 1.
Based on the above structure, the integrally formed external piston pipette tip of the present embodiment, the piston portion and the tip tube body 1 may be formed in one step by additive manufacturing, specifically, the tip tube body 1 and the piston portion may be integrally formed by using a 3D printing additive process, specifically, using a nylon material as an example, a Selective Laser Sintering (SLS) or a thermal extrusion (FDM) forming process may be used. Corresponding to the printing model of this embodiment's external piston pipettor suction head of integrated into one piece, piston portion sets up in suction head body 1, bulldoze section 21 wholly setting in shaping appearance intracavity 12, just bulldoze section 21 and shaping appearance intracavity 12 inner wall between have the clearance, the printing model corresponds the printing platform horizontal plane wholly and is the vertical setting of axial, the printing model is near piston rod wears chamber 13 one side towards the printing platform, extend section 22 is vertical to be arranged in on the printing platform. So can realize through 3D prints the material adding technology shaping technique that the shaping of material adding, realize suction head body 1 and piston portion, after the shaping piston portion set up in the shaping appearance intracavity 12 of piston sliding chamber 11 promptly to because the spacing effect in piston rod puncture chamber 13, piston portion can't drop out from suction head body 1 tail end, can guarantee suction head body 1's lumen and piston portion not receive the pollution. In operation, the pushing section 21 is pressed into the piston sliding cavity 11, and the piston part is axially moved, so that the suction or liquid discharge of the suction head can be realized. Therefore, compared with the traditional pipe body and piston split molding technology, the integrated external piston pipette suction head saves the assembly cost of parts. In this embodiment, the upper end of the pushing section 21 is provided with a tapered extrusion head 24, the front end of the suction head tube body 1 is provided with a liquid outlet cavity 17 adapted to the tapered extrusion head 24, and an opening at the top end of the liquid outlet cavity 17 extends out of the top of the suction head tube body 1. The conical extrusion head 24 and the liquid outlet cavity 17 are matched to ensure that liquid in the pipe cavity is completely discharged. In this embodiment, in the integral printing model of the tip body 1 and the piston portion, the gap distance between the pressing section 21 and the molding cavity 12 is 1mm.
Further, in this embodiment, a connection structure is disposed at the bottom of the extension section 22, and the connection structure is used for connecting with an external piston rod. The bottom of the pushing section 21 is required to be provided with a piston rod, the traditional piston rod and the pushing section 21 are integrally formed, but when the 3D printing additive forming is carried out, because in a forming model of 3D printing, the pushing section 21 is arranged in a forming accommodating cavity 12 at the lower end of the piston sliding cavity 11, if the piston rod and the pushing section 21 are integrally formed, the height of a printing forming part can be overlarge, on one hand, the stability is poor during forming, the perpendicularity of a forming product is difficult to guarantee, and on the other hand, the production efficiency can be influenced. In this embodiment, the piston portion and the piston rod are designed in a split manner, and the connection structure at the bottom of the extension section 22 is used for connection with the piston rod, where the piston rod may be pre-installed or integrally disposed on the pipette, or may be a separate rod connected with the extension section 22. It should be noted that, since the piston rod itself does not contact the inner wall of the piston sliding cavity 11, the connection between the piston rod and the extension section 22 does not require an external piston pipette tip integrally formed with the piston head as in the conventional piston rod, and it is necessary to install it in advance in a high-cleanliness environment before shipment. Therefore, the integrally formed external piston pipette tip according to the embodiment adopts the design of the piston rod and the piston part body, but does not need to be installed in advance before leaving the factory, and is not contradictory with the beneficial effect of saving the assembly cost of the parts in the embodiment. In particular, the piston rod may be self-installed by the user in the form of a fitting.
The press-fitting member 3 is provided separately from the suction nozzle body 1, but the press-fitting member 3 is not required to be mounted on the suction nozzle body 1 before shipment. Not contradictory to the advantageous effect of omitting the assembly cost of the components of the present embodiment. In particular, the press-fit 3 may be self-installed by the user in the form of a fitting.
Further, in this embodiment, as shown in fig. 8, a transition slope 23 is provided between the pushing section 21 and the extending section 22. The radial dimension of the extension section 22 is smaller than that of the pushing section 21, if the interface between the pushing section 21 and the extension section 22 is a plane to form a step, a supporting structure is required to be arranged at the corresponding step when printing and forming, and after forming is completed, the supporting structure is required to be removed, so that the production efficiency is affected. In this embodiment, by setting the transition inclined plane 23, the maximum inclination angle of the inclined plane is smaller than the limit angle of the supporting structure, so that the supporting structure is not required to be set in the forming process, and the production efficiency is improved.
Further, in this embodiment, as shown in fig. 9, the penetration hole 16 communicates with the forming cavity 12. The limiting clamping piece 15 enters the forming accommodating cavity 12 after being pressed. In this embodiment, a limiting edge 213 is disposed on a side of the pushing section 21 near the extending section 22, and when the front end of the limiting clip 15 is pressed into the forming cavity 12 by the pressing member 3, the whole pushing section 21 slides in the piston sliding cavity 11 toward the piston rod penetrating cavity 13, the limiting edge 213 is used for abutting against the front end of the limiting clip 15, so as to prevent the pushing section 21 from moving axially. In this embodiment, the limiting edge 213 is adapted to the shape of the upper end surface of the front end of the limiting clip 15. Based on the above structure, two effects can be achieved, one is to achieve quantitative suction of the suction head by limiting the sliding stroke of the above pushing section 21; on the other hand, when the liquid material is sucked, if the pushing section 21 completely enters the forming cavity 12 from the piston sliding cavity 11, a gap exists between the pushing section 21 and the forming cavity 12, so that leakage occurs in the negative pressure cavity for sucking the liquid material, and the liquid material flows back. So through setting up above-mentioned structure, when spacing edge 213 is inconsistent with spacing fastener 15 front end, bulldoze section 21 front end and still closely laminate with piston sliding chamber 11 lateral wall to can guarantee to absorb the leakproofness in liquid material negative pressure chamber, can also realize the ration and absorb.
Further, in this embodiment, as shown in fig. 10, the side wall of the pressing section 21 is provided with a first groove 211 corresponding to the front end of the limiting clip 15, and when the front end of the limiting clip 15 enters the first groove 211 to be matched with the first groove, the piston is axially locked. The extension section 22 needs to be axially connected with the external piston rod, so that in order to prevent the piston part from being moved by axial force in the process, the axial locking of the piston part can be realized through the limit fit of the limit clamping piece 15 and the first groove part 211.
Further, in this embodiment, a limiting and fitting surface 121 is disposed at the bottom of the forming cavity 12, and when the bottom end of the pushing section 21 contacts with the limiting and fitting surface 121, the first groove 211 moves to a position matching with the front end of the limiting clip 15.
Before the front end of the limiting clamp 15 is pressed into the first groove 211, the piston part falls to the bottom end of the pushing section 21 to contact with the limiting joint surface 121, so as to complete the pre-positioning, thereby ensuring that the front end of the limiting clamp 15 can be pressed into the first groove 211. At this time, the limiting contact surface 121 plays a role in limiting the lower end of the piston. In this embodiment, the limiting contact surface 121 is adapted to the shape of the transition bevel 23.
Further, in this embodiment, as shown in fig. 8, a set of annular grooves 212 are axially spaced from each other on the side wall of the pushing section 21 slidably attached to the piston sliding chamber 11.
The sliding of the pushing section 21 in the piston sliding cavity 11 needs to realize liquid extraction, so that the joint of the pushing section 21 and the piston sliding cavity 11 needs to ensure tightness, that is, the pushing section 21 and the piston sliding cavity 11 are in interference fit, and therefore, when the piston part is pushed to enable the pushing section 21 to axially slide in the piston sliding cavity 11, excessive resistance can be caused. In order to solve the above-mentioned problem, the present embodiment provides the annular groove 212 for providing a deformation space where the pushing section 21 is plastically deformed when the pushing section 21 slides axially in the piston slide chamber 11, so as to reduce the resistance when the pushing section 21 slides in the piston slide chamber 11.
The application method of the integrated external piston pipette tip is as follows:
The whole piston part is axially moved by gravity until the transition inclined plane 23 is attached to the limit attaching surface 121; screwing the pressing piece 3 to press the limiting clamping piece 15 to be attached to the limiting surface 161, wherein the front end of the limiting clamping piece 15 is matched with the first groove 211 so as to realize axial locking of the piston part; after the piston rod is installed, the pressing piece 3 is moved upwards to be separated from the limiting clamping piece 15, and the piston part is axially moved to the pushing section 21 to enter the piston sliding cavity 11; finally, the pressing piece 3 is screwed until the limiting clamping piece 15 presses on the limiting surface 161. In this case, when the suction head is used to suck the liquid material, the piston portion can be prevented from moving axially.
The technical principles of the present invention have been described above in connection with specific embodiments, which are provided for the purpose of explaining the principles of the present invention and are not to be construed as limiting the scope of the present invention in any way. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (9)
1. The utility model provides an external piston pipettor suction head of integrated into one piece, includes suction head body (1), be equipped with piston portion in suction head body (1), be equipped with piston sliding chamber (11) in suction head body (1), piston portion includes bulldozes section (21) that suits with piston sliding chamber (11) radial dimension, its characterized in that:
The piston sliding cavity (11) is provided with a forming cavity (12) at one side far away from the outlet end of the suction head pipe body (1), the radial size and the axial size of the forming cavity (12) are larger than those of the pushing section (21), one end of the forming cavity (12) far away from the piston sliding cavity (11) is provided with a piston rod penetrating cavity (13), the piston rod penetrating cavity (13) corresponds to the bottom opening of the suction head pipe body (1), and the radial size of the pushing section (21) is larger than that of the piston rod penetrating cavity (13);
An extension section (22) is arranged at one end, close to the piston rod penetrating cavity (13), of the pushing section (21), the radial size of the extension section (22) is smaller than that of the piston rod penetrating cavity (13), and the extension section (22) can extend out of the bottom of the suction head pipe body (1);
the suction head pipe body (1) is an integral piece;
The suction head pipe body (1) is provided with a boss (14) protruding out of the side wall in an extending mode, the boss (14) is provided with a limiting clamping piece (15), the side wall of the suction head pipe body (1) is provided with a penetrating hole (16) corresponding to the limiting clamping piece (15), the penetrating hole (16) is communicated with the forming accommodating cavity (12), the suction head pipe body further comprises a pressing piece (3), and the pressing piece (3) is used for pressing the limiting clamping piece (15) to enable the front end of the pressing piece to penetrate through the penetrating hole (16) to enter the forming accommodating cavity (12);
The side wall of the pushing section (21) is provided with a first groove part (211) which is matched with the front end of the limiting clamping piece (15), and when the front end of the limiting clamping piece (15) enters the first groove part (211) to be matched with the first groove part, the piston part is axially locked.
2. The integrally formed external piston pipette tip of claim 1 wherein: the bottom of the extension section (22) is provided with a connecting structure which is used for connecting an external piston rod.
3. The integrally formed external piston pipette tip of claim 1 wherein: a transition inclined plane (23) is arranged between the pushing section (21) and the extending section (22).
4. The integrally formed external piston pipette tip of claim 1 wherein: the bottom of the forming cavity (12) is provided with a limiting joint surface (121), and when the bottom end of the pushing section (21) is contacted with the limiting joint surface (121), the first groove part (211) moves to a position matched with the front end of the limiting clamping piece (15).
5. The integrally formed external piston pipette tip of claim 1 wherein: the utility model discloses a suction head pipe body, including suction head pipe body (1) and suction head pipe body, spacing fastener (15) bottom sets up the suction head pipe body (1) outside, spacing fastener (15) whole orientation the oblique upper extension setting of suction head pipe body (1) axle core is not under the exogenic state, spacing fastener (15) front end is in shaping appearance chamber (12) outside, pressfitting piece (3) set up spacing fastener (15) top, pressfitting piece (3) can be followed suction head pipe body (1) lateral wall axial displacement, pressfitting piece (3) orientation in-process that spacing fastener (15) direction axial displacement can be pushed spacing fastener (15) crooked to its front end pass through in puncture hole (16) get into shaping appearance chamber (12).
6. The integrally formed external piston pipette tip of claim 1 wherein: the pressing piece (3) is integrally annular and sleeved on the outer side wall of the suction head pipe body (1) and is in threaded connection with the outer side wall of the suction head pipe body (1), and an annular pressing table (31) is arranged at the bottom end of the pressing piece (3).
7. The integrally formed external piston pipette tip as specified in claim 4 wherein: the vertical section outline of the limiting clamping piece (15) comprises an arc edge at the outer side and an arc edge at the inner side, the bottom width of the limiting clamping piece (15) is larger than the top width, and the whole limiting clamping piece is sickle-shaped.
8. The integrally formed external piston pipette tip of claim 1 wherein: and a limiting surface (161) which is matched with the inner side surface of the limiting clamping piece (15) is arranged at the bottom of the penetrating hole (16).
9. The integrally formed external piston pipette tip of claim 1 wherein: the side wall of the pushing section (21) which is in sliding fit with the piston sliding cavity (11) is provided with a group of annular grooves (212) which are axially arranged at intervals.
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| CN202311270271.4A CN117244602B (en) | 2023-09-28 | 2023-09-28 | Integrated external piston pipette suction head |
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| CN202311270271.4A CN117244602B (en) | 2023-09-28 | 2023-09-28 | Integrated external piston pipette suction head |
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| CN117244602A CN117244602A (en) | 2023-12-19 |
| CN117244602B true CN117244602B (en) | 2024-05-24 |
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