CN218439648U

CN218439648U - Micro-injection pump

Info

Publication number: CN218439648U
Application number: CN202223005472.5U
Authority: CN
Inventors: 张子军; 韦华梅
Original assignee: Jiaozuo Yanhang Power Technology Co ltd
Current assignee: Jiaozuo Yanhang Power Technology Co ltd
Priority date: 2022-11-11
Filing date: 2022-11-11
Publication date: 2023-02-03
Anticipated expiration: 2032-11-11

Abstract

The utility model discloses a micro-injection pump has solved the not high problem of micro-pump to flow rate control's precision among the prior art. The utility model discloses a micro-injection pump, including supporting seat, step motor and injection cylinder, the injection cylinder includes outer barrel and piston rod connected with the piston, the piston rod is connected with the step motor through the screw rod drive mechanism arranged on the supporting seat, the outer barrel is connected on the supporting seat through the double-sided board seat, the step motor is connected with the controller; the stepping motor drives the piston rod to move in the outer cylinder through the lead screw transmission mechanism, so that the medium in the injection syringe has stable working flow velocity. The utility model mainly pushes out liquid by the continuous propulsion of the screw rod mechanism, and does not extrude liquid intermittently, thereby solving the problem of the pulsating flow velocity; the utility model discloses a step motor is as drive element, and 360 degrees of round can be divided into 3200 step control, and it is 1mm to change round forward distance, so control accuracy is 1/3200mm, has improved control accuracy greatly.

Description

Micro-injection pump

Technical Field

The utility model relates to a micropump technical field especially indicates a micro-injection pump.

Background

In the disciplines of chemistry, biology, materials, energy, medical treatment and the like, when a liquid or gas experiment is carried out, stable liquid flow rate or titration speed or gas flow rate is needed, but the working principle of the peristaltic pump on the market at present is that the peristaltic pump is like clamping and extruding a hose filled with fluid by fingers, and the fluid in the hose moves forwards along with the forward sliding of the fingers. Peristaltic pumps are also the principle only replacing the fingers with rollers. The fluid is pumped by alternately squeezing and releasing the elastic delivery hose of the pump. The rollers roll to crush the liquid pipeline, and the liquid flows through rolling, so that the pushed liquid has a pulsation phenomenon and is not stably and continuously output because the rollers are spaced. And because pipe diameter, pipe are rolled completely and the dynamics that the gyro wheel rolled all can cause the influence to the accuracy of velocity of flow, so the precision can't be guaranteed, can't reach the experimental requirement.

SUMMERY OF THE UTILITY MODEL

Not enough to in the above-mentioned background art, the utility model provides a micro-injection pump has solved among the prior art problem that micro-pump is not high to flow rate control's precision.

The technical scheme of the utility model is realized like this: a micro-injection pump comprises a supporting seat, a stepping motor and an injection needle cylinder, wherein the injection needle cylinder comprises an outer cylinder body and a piston rod connected with a piston, the piston rod is connected with the stepping motor through a screw rod transmission mechanism arranged on the supporting seat, the outer cylinder body is connected to the supporting seat through a double-panel seat, and the stepping motor is connected with a controller; the stepping motor drives the piston rod to move in the outer cylinder body through the lead screw transmission mechanism, so that the medium in the injection syringe has stable working flow velocity.

The supporting seat comprises a base and a perpendicularly arranged rear side plate, the double-panel seat is fixed at the front end of the base and arranged opposite to the rear side plate, and the screw rod transmission mechanism is located between the double-panel seat and the rear side plate.

The lead screw drive mechanism includes lead screw and at least one guide bar that the level set up, guide bar and lead screw parallel arrangement, and the both ends of guide bar are fixed respectively on double-faceplate seat and posterior lateral plate, and the one end of lead screw is rotated and is connected on double-faceplate seat, the other end passes the posterior lateral plate and is connected with step motor, threaded connection has the slider on the lead screw, slider and guide bar sliding connection, and the piston rod is connected with the slider.

The end of the piston rod is provided with a chuck, the sliding block is provided with a first pressing plate used for clamping and fixing the chuck, the first pressing plate is detachably connected to the sliding block through a bolt, and the first pressing plate is provided with an avoiding groove matched with the piston rod.

The double-sided board seat comprises a front board seat and a rear board seat which are arranged in parallel, the rear board seat is fixed on the supporting seat, a connecting column used for connecting the front board seat is arranged on the rear board seat, and a clamping piece used for fixing the outer cylinder body on the front board seat and the rear board seat is arranged on the connecting column.

The clamping piece comprises a vertically arranged long stud, and a second pressing plate is arranged on the long stud; and the front plate seat and the rear plate seat are respectively provided with at least one limiting groove matched with the outer cylinder body.

The controller comprises a single chip microcomputer arranged in a shell, and the shell is provided with a foot switch, a display screen and a plurality of data interfaces, wherein the foot switch, the display screen and the plurality of data interfaces are connected with the single chip microcomputer.

A front limiting module and a rear limiting module corresponding to the screw rod transmission mechanism are arranged on one side of the supporting seat; the front limiting module and the rear limiting module correspond to the front limiting position and the rear limiting position of the lead screw transmission mechanism; the front limiting module and the rear limiting module are both connected with the controller.

The front limiting module and the rear limiting module both comprise fixing plates, limiting switches corresponding to the sliding blocks of the screw rod transmission mechanism are arranged on the fixing plates, and signal indicating lamps and signal interfaces are further arranged on the fixing plates.

The utility model has the advantages that: the utility model mainly pushes out the liquid by the continuous propulsion of the screw rod mechanism, and the liquid is not extruded intermittently, thereby solving the problem of the pulsating flow velocity; the utility model discloses a step motor is as drive element, and 360 degrees of round can be divided into 3200 step control, and the round distance of advancing of changeing is 1mm, so control accuracy is 1/3200mm, has improved control accuracy greatly. Furthermore, the utility model discloses the separation of the pump body and control end has been accomplished to standardizing both, like this the same controller can correspond the different pump bodies, and the pump body all is processed by standard component and ya keli (or metal) panel and comes, and is relatively speaking, and processing cycle is short, and is with low costs, based on above-mentioned advantage, lets this micro-injection pump more changeable, only changes the shape of panel pump head, just is fit for multiple scene, improves its suitability greatly. In addition, the controller of the micro-injection pump is provided with a data interface, and can be connected with a computer and a storage accessory in an expanding way, so that the micro-injection pump is convenient to comprehensively control.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.

Fig. 1 is a schematic view of the structure of the micro-injection pump of the present invention.

Fig. 2 is a schematic diagram of the controller of the present invention.

Fig. 3 is a partial schematic view of the supporting seat of the present invention supporting three syringe cylinders.

Fig. 4 is a schematic view of the installation of the front and rear limiting modules in embodiment 3.

Fig. 5 is a schematic structural diagram of a rear limiting module.

Fig. 6 is a control flow chart of the present invention.

Fig. 7 is a control block diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, embodiment 1 is a micro syringe pump including a support base 1, a stepping motor 2, and a syringe 3. The supporting seat can be made of acrylic (or metal) plates. The specification range of the outlet of the injection syringe is 0.5ul to 1ul, the specification of the injection syringe is as small as 1ml to 5ml, and the specification of the injection syringe is as large as 200ml to 500ml, the injection syringe is compatible with basically all standard specification injectors in the market at present, and the application range is wide. The supporting seat provides support for the stepping motor and the injection needle cylinder. The injection syringe 3 comprises an outer cylinder body 301 and a piston rod 302 connected with a piston; the piston rod can slide in the outer cylinder in a sealing way, so that the volume of the high-pressure cavity and the low-pressure cavity is changed. In this embodiment, the piston rod 302 is connected to the stepping motor 2 through the screw transmission mechanism 4 disposed on the supporting seat 1, and the stepping motor rotates to drive the screw mechanism to rotate, thereby driving the piston rod to slide relative to the outer cylinder. Outer barrel 301 passes through double-face plate seat 5 and connects on supporting seat 1, improves the stability of outer barrel. The stepping motor 2 is electrically connected with the controller 6, and the controller controls whether the stepping motor rotates or not. The stepping motor 2 drives the piston rod 302 to move in the outer cylinder 301 through the lead screw transmission mechanism 4, so that the medium in the injection syringe 3 has stable working flow velocity. Adopt the mode of propelling the cylinder in succession, solved the problem of above-mentioned pulsation velocity of flow to because the motor adopts step motor, 360 degrees of round can be divided into 3200 step control, and it is 1mm to rotate round forward distance, so the control accuracy is 1/3200mm. The problem of control accuracy is also solved.

Further preferred are: the supporting seat 1 comprises a base 101 and a rear side plate 102 which is vertically arranged; the rear side plate provides support for the stepping motor and the corresponding screw rod. The double-panel seat 5 is fixed at the front end of the base 101 and is arranged opposite to the rear side plate 102, namely the double-panel seat and the rear side plate are arranged in parallel, and the screw rod transmission mechanism 4 is positioned between the double-panel seat 5 and the rear side plate 102; effecting movement of the piston rod over the distance between the double sided plate holder 5 and the rear side plate 102.

Embodiment 2, on the basis of embodiment 1, the screw transmission mechanism 4 comprises a screw 401 and at least one guide rod 402 which are horizontally arranged; in order to further provide the stability of the sliding of the piston rod, in this embodiment, a screw rod and two guide rods are provided, the guide rod 402 is arranged in parallel with the screw rod 401, and the guide rods are located on two sides of the screw rod. Two ends of a guide rod 402 are respectively fixed on the double-panel seat 5 and the rear side plate 102, one end of a screw rod 401 is rotatably connected on the double-panel seat 5, and the other end of the screw rod passes through the rear side plate 102 to be connected with the stepping motor 2; and bearings are arranged at the joints of the screw rod, the double-panel seat 5 and the rear side plate 102, and the rotary connection of the screw rod and the double-panel seat is realized through the bearings. The screw 401 is connected with a slide block 403 through threads, the slide block 403 is connected with a guide rod 402 in a sliding mode, and the guide rod limits the slide block to prevent the slide block from rotating. Piston rod 302 is connected to slider block 403. Under the action of a motor, the screw rod drives the sliding block to slide along the guide rod, and then the piston rod is driven to move in the outer barrel.

As a further preferable scheme, the end of the piston rod 302 is provided with a chuck 303, which can be a circular chuck, and the diameter of the circular chuck is larger than that of the piston rod. A first pressing plate 404 for clamping the chuck 303 is arranged on the sliding block 403, and the first pressing plate 404 is detachably connected to the sliding block 403 through a bolt; under the connection state, the first pressing plate fixes the piston rod on the sliding block through the pressing chuck. In order to further improve the connection firmness, an avoiding groove 405 matched with the piston rod 302 is arranged on the first pressing plate 404; the avoidance grooves correspond to the piston rods one by one, and when a plurality of piston rods exist, a plurality of corresponding avoidance grooves are arranged; as shown in fig. 3, the first pressing plate is provided with 3 avoidance grooves.

In this embodiment, the double-panel seat 5 includes a front-panel seat 501 and a rear-panel seat 502 which are arranged in parallel, the rear-panel seat 502 is fixed on the supporting seat 1, a connecting column 503 for connecting the front-panel seat 501 is arranged on the rear-panel seat 502, and the top surfaces of the front-panel seat and the rear-panel seat are in the same plane and support the outer cylinder together. The connecting column 503 is provided with a fastener for fixing the outer cylinder 301 on the front board seat 501 and the rear board seat 502. Specifically, the clamping member includes a vertically arranged long stud 504, and a second pressing plate 505 is arranged on the long stud 504; the front plate seat 501 and the rear plate seat 502 are respectively provided with at least one limiting groove 506 matched with the outer cylinder 301, and the outer cylinder is stably limited in the limiting groove. As shown in fig. 3, three limiting grooves corresponding to each other in the front and back are formed on the front plate base 501 and the back plate base 502, so that the function of fixing 3 injection syringes by the double-panel base is realized. The front end is replaced to meet the requirement of three channels (three injectors are clamped at the same time), and more channels can be met in the same way. In the same way, different motors can be replaced to adapt to different thrusts.

The other structure is the same as embodiment 1.

In embodiment 3, as shown in fig. 2, the controller 6 includes a single chip microcomputer disposed in a housing 601, and the housing 601 is provided with a foot switch, a display screen, and a plurality of data interfaces, which are connected to the single chip microcomputer. The controller is provided with various interfaces, can be connected with a network calculator, and can be connected with external control equipment, sensors and the like. The singlechip is used for controlling and reading the micro-pump through the communication interface, so the singlechip can be connected to a comprehensive controller (which can be a computer) to control the cooperative work of a plurality of pumps.

In a further preferable scheme, as shown in fig. 4, a front limiting module 7 and a rear limiting module 8 corresponding to the screw rod transmission mechanism 4 are arranged on one side of the supporting seat 1; specifically, it may be disposed on the base 101 and correspond to the slider 403. The front limiting module 7 and the rear limiting module 8 correspond to the front limit position and the rear limit position of the lead screw transmission mechanism 4; the front limiting module 7 and the rear limiting module 8 are electrically connected with the controller 6. In order to prevent parameter setting or misoperation, cause the middle slider that removes to collide the front and back structural slab and cause the damage, the utility model discloses do the spacing module of preventing touching specially for the micropump for whether the slider reachs limit position in the middle of detecting.

Specifically, as shown in fig. 5, each of the front limiting module 7 and the rear limiting module 8 includes a fixing plate 701, and the fixing plate is connected to the base through a screw and a T-nut. The fixed plate 701 is provided with a limit switch 702 corresponding to the slide block 403 of the screw rod transmission mechanism 4, the fixed plate 701 is also provided with a signal indicator light 703 and a signal interface 704, and the signal interface is connected with a controller through a lead. The limit switch 702 is used for sensing whether the middle sliding block reaches a limit position, when the sliding block touches the limit switch, the indicating lamp is turned on, the signal interface sends a limit signal to the main board, and the controller controls the motor to stop moving.

As shown in fig. 6 and 7, in the actual working process, parameters such as specification of the injector, flow rate, pushing time and the like are adjusted through keys, and the parameters are displayed on a screen. The controller is provided with a stepping motor interface for connecting a stepping motor; the data input/output interface is used for connecting a computer or an external control box; the limit switch interface is used for connecting a limit switch and limiting the moving range of the sliding block; the foot switch interface is used for external foot control, and pedal can replace the button to open and stop the motion, and it is more convenient to operate. The pump body is continuously pushed by the stepping motor, fluid can have stable flow velocity, and the problem of pulsating flow velocity is solved.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro-syringe pump, characterized by: the injection syringe (3) comprises an outer barrel (301) and a piston rod (302) connected with a piston, the piston rod (302) is connected with the stepping motor (2) through a screw rod transmission mechanism (4) arranged on the supporting seat (1), the outer barrel (301) is connected onto the supporting seat (1) through a double-panel seat (5), and the stepping motor (2) is connected with a controller (6); the stepping motor (2) drives the piston rod (302) to move in the outer cylinder body (301) through the screw rod transmission mechanism (4), so that the medium in the injection syringe (3) has stable working flow velocity.

2. The micro syringe pump of claim 1, wherein: the supporting seat (1) comprises a base (101) and a rear side plate (102) which is vertically arranged, the double-panel seat (5) is fixed at the front end of the base (101) and is arranged opposite to the rear side plate (102), and the screw rod transmission mechanism (4) is positioned between the double-panel seat (5) and the rear side plate (102).

3. The micro syringe pump of claim 2, wherein: screw drive mechanism (4) are including lead screw (401) and at least one guide bar (402) that the level set up, guide bar (402) and lead screw (401) parallel arrangement, and the both ends of guide bar (402) are fixed respectively on two panel seats (5) and posterior lateral plate (102), and the one end of lead screw (401) is rotated and is connected on two panel seats (5), and the other end passes posterior lateral plate (102) and is connected with step motor (2), threaded connection has slider (403) on lead screw (401), slider (403) and guide bar (402) sliding connection, and piston rod (302) are connected with slider (403).

4. The micro syringe pump of claim 3, wherein: the end of the piston rod (302) is provided with a chuck (303), a first pressing plate (404) used for clamping and fixing the chuck (303) is arranged on the sliding block (403), the first pressing plate (404) is detachably connected to the sliding block (403) through a bolt, and an avoiding groove (405) matched with the piston rod (302) is formed in the first pressing plate (404).

5. The microinjection pump according to any one of claims 1 to 4, wherein: the double-panel seat (5) comprises a front plate seat (501) and a rear plate seat (502) which are arranged in parallel, the rear plate seat (502) is fixed on the supporting seat (1), a connecting column (503) used for connecting the front plate seat (501) is arranged on the rear plate seat (502), and a clamping piece used for fixing the outer cylinder (301) on the front plate seat (501) and the rear plate seat (502) is arranged on the connecting column (503).

6. The micro syringe pump of claim 5, wherein: the clamping piece comprises a long stud (504) which is vertically arranged, and a second pressing plate (505) is arranged on the long stud (504); the front plate seat (501) and the rear plate seat (502) are respectively provided with at least one limiting groove (506) matched with the outer cylinder body (301).

7. The micro injection pump according to any one of claims 1 to 4 and 6, wherein: the controller (6) comprises a single chip microcomputer arranged in a shell (601), and a foot switch, a display screen (602) and a plurality of data interfaces which are connected with the single chip microcomputer are arranged on the shell (601).

8. The micro syringe pump of claim 7, wherein: a front limiting module (7) and a rear limiting module (8) which correspond to the screw rod transmission mechanism (4) are arranged on one side of the supporting seat (1); the front limiting module (7) and the rear limiting module (8) correspond to the front limit position and the rear limit position of the screw rod transmission mechanism (4); the front limiting module (7) and the rear limiting module (8) are connected with the controller (6).

9. The micro syringe pump of claim 8, wherein: the front limiting module (7) and the rear limiting module (8) both comprise a fixing plate (701), a limiting switch (702) corresponding to a sliding block (403) of the screw rod transmission mechanism (4) is arranged on the fixing plate (701), and a signal indicator lamp (703) and a signal interface (704) are further arranged on the fixing plate (701).