Grating type high-precision injection pump

Abstract

The utility model belongs to the technical field of dosing devices, and particularly discloses a grating type high-precision injection pump which comprises a base plate, an injector fixing piece connected to the base plate, an injector installed on the injector fixing piece, a connecting piece, a controller, a grating ruler and an installation table connected to the base plate in parallel, a sliding plate is horizontally and slidably connected to the grating ruler, a sliding table is horizontally and slidably connected to the mounting table, the connecting piece is connected with the sliding plate and the sliding table, and a driving piece for driving the sliding table to slide is arranged on the mounting table; the tail end of a push rod of the injector is fixed on the connecting piece; a photoelectric sensing switch is connected to the base plate, a sensing piece is connected to one side of the connecting piece, the controller is electrically connected with the driving piece and the photoelectric sensing switch, and when the sensing piece moves to the photoelectric sensing switch and triggers the photoelectric sensing switch, the controller controls the sliding table to stop sliding, and at the moment, a push rod of the injector is pushed to the bottom of a needle cylinder of the injector. The sampling accuracy of the injection pump can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drug delivery devices, in particular to a grating-type high-precision injection pump. Background Art

[0002] At present, for online water quality monitoring, a syringe pump is required for quantitative collection. However, traditional syringe pumps usually use stepper motors or precision servo motors for stroke measurement. However, simply using a stepper motor for drive measurement has low stroke accuracy, no feedback for lost steps, and relatively poor repeatability. The longer the stroke, the greater the cumulative error. The measurement accuracy is greatly affected by the assembly error. As a result, errors occur when collecting sample liquids, which easily affects the accuracy of the test data. Utility Model Content

[0003] The utility model provides a grating-type high-precision injection pump, aiming to improve the sampling accuracy of the injection pump.

[0004] The utility model is realized by the following technical solution: a grating-type high-precision syringe pump, comprising a base plate, a syringe fixing member connected to the base plate, a syringe mounted on the syringe fixing member, a connecting member and a controller, a grating ruler and a mounting platform arranged parallel to each other connected to the base plate, a slide connected to the grating ruler for horizontal sliding, a slide connected to the mounting platform for horizontal sliding, the connecting member connected to the slide and the slide, a driving member for driving the slide to slide is provided on the mounting platform; the tail end of the push rod of the syringe is fixed to the connecting member;

[0005] A photoelectric sensor switch is connected to the substrate, a sensor sheet is connected to one side of the connector, and the controller is electrically connected to the driving member and the photoelectric sensor switch. When the sensor sheet moves to the photoelectric sensor switch and triggers the photoelectric sensor switch, the controller controls the slide to stop sliding, and at this time the push rod of the syringe is pushed to the bottom of the syringe barrel.

[0006] Compared with the existing technology, this solution has the following advantages and beneficial effects:

[0007] In this solution, a driver drives the slide forward and backward, and the slide is connected to the slide plate via a connector. This allows the slide plate and the slide to operate synchronously, and also the syringe's plunger. As the slide moves, it drives a sensor plate on one side of the connector. When the slide reaches a designated position, the sensor plate triggers a photoelectric sensor switch, which in turn causes the controller to stop the slide and push the syringe's plunger to the bottom of the syringe barrel.

[0008] In this solution, the setting of the grating ruler can detect the distance moved by the syringe to collect samples in real time. In actual use, the grating ruler origin position can be set by cooperating with the sensor plate and the photoelectric sensor switch, and then the origin calibration is performed to find the error value between the set distance and the actual driving distance. Then, the actual metering stroke is obtained by adding the absolute value of the error value to the set grating ruler distance length. Finally, the volume of the injection pump can be calculated according to the diameter of the syringe, thereby improving the accuracy of the syringe to collect samples.

[0009] This syringe pump structure has low assembly requirements. By combining the grating scale and photoelectric sensor switches with the controller, stroke errors can be reduced. The slide, the slide on the grating scale, and the syringe push rod are fixed to achieve synchronous movement. Through control programming, high-precision syringe pump metering can be achieved, thereby improving measurement accuracy.

[0010] Furthermore, the driving member includes a motor and a screw rod, one end of the screw rod is connected to the motor, the other end of the screw rod is rotatably connected to one side of the mounting platform, and the slide is threadedly engaged with the screw rod.

[0011] Beneficial effects: The driving member in this solution can drive the slide to move by rotating the lead screw through the motor. The driving member has a simple structure and stable cooperation with the slide.

[0012] Furthermore, the motor is a stepping motor.

[0013] Beneficial effects: The motor of this solution adopts a stepper motor, which has a simple structure and low cost. In combination with the grating ruler, photoelectric sensor switch, controller, etc. in this utility model, it can overcome the error problem caused by motor step loss.

[0014] Furthermore, a slide rail parallel to the grating ruler is installed on the mounting platform, and the slide platform is in sliding cooperation with the slide rail.

[0015] Beneficial effect: The setting of the slide rail in this solution can guide the sliding of the slide, making the movement of the slide more precise.

[0016] Furthermore, the connecting member includes a first connecting member and a second connecting member, each of the first connecting member and the second connecting member includes two side plates and a bottom plate, and the two side plates are vertically connected to both sides of the bottom plate, the first connecting member covers the outside of the slide and the bottom plate of the first connecting member is connected to the slide, and the bottom plate of the second connecting member is connected to the slide; the two side plates of the first connecting member are respectively connected to the sensor plate and the second connecting member, and the tail end of the push rod of the syringe is fixed to the second connecting member.

[0017] Beneficial effect: The connecting parts in this scheme include a first connecting part and a second connecting part. The structures of the first connecting part and the second connecting part are similar, except that when installing, the installation positions and directions of the base plates of the two are opposite. The slide and the slide plate are connected as one through the first connecting part and the second connecting part, so that the syringe push rod, slide plate and slide plate can run synchronously, which is convenient for automatically driving the syringe for sampling.

[0018] Furthermore, a U-shaped notch is provided on a side of the second connecting member close to the syringe, and the push rod of the syringe is clamped on the U-shaped notch. The second connecting member is provided with a locking member for locking the tail end of the push rod of the syringe.

[0019] Beneficial effects: In this solution, a U-shaped notch is provided on one side of the second connecting member, which facilitates positioning and limiting the push rod, and the locking member can further fix the push rod of the syringe, making the placement position of the syringe more stable.

[0020] Furthermore, the locking member includes a screw, which is threadedly connected to a side surface of the second connecting member away from the syringe. Tightening the screw can compress the tail end of the push rod of the syringe.

[0021] Beneficial effect: The locking rod in this solution is threadedly engaged with a side surface of the second connecting piece through the screw, so that the screw can gradually press the tail end of the push rod of the syringe, thereby fixing the tail end of the push rod of the syringe.

[0022] Furthermore, one end of the screw rod close to the syringe is connected to a limit plate.

[0023] Beneficial effect: The setting of the limiting plate can increase the contact area between the limiting plate and the tail end of the push rod of the syringe, so that the push rod of the syringe is fixed more stably.

[0024] Furthermore, the syringe fixing part is provided with a socket for inserting the syringe barrel, and the socket is arranged horizontally. The side of the syringe fixing part is provided with a plurality of limiting holes communicating with the socket, and the limiting parts are connected to the limiting parts through threads in the limiting holes, and the syringe barrel is limited by tightening the limiting parts.

[0025] Beneficial effect: The socket on the syringe fixing part in this solution can play a role in preliminary positioning of the inserted syringe barrel, and the setting of the limiting hole can further limit and fix the syringe barrel by screwing the limiting part into the limiting hole to prevent the syringe barrel from sliding.

[0026] Furthermore, the mounting platform, grating ruler, syringe fixing part and photoelectric sensor switch are all detachably connected to the base plate.

[0027] Beneficial effect: This arrangement makes it easy to replace the component in time when it is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0029] Figure 1 This is a three-dimensional diagram of an embodiment of a grating-type high-precision injection pump of the utility model;

[0030] Figure 2 This is a top view of an embodiment of a grating-type high-precision injection pump of the utility model;

[0031] Figure 3 This is an exploded schematic diagram of an embodiment of a grating-type high-precision injection pump of the present utility model.

[0032] Markings and corresponding parts names in the accompanying drawings:

[0033] Mounting table 1, slide 101, motor 102, screw 103, slide rail 104, photoelectric sensor switch 2, syringe 3, grating ruler 4, slide plate 401, syringe fixing part 5, limiting hole 501, connecting part 6, first connecting part 601, second connecting part 602, U-shaped notch 6022, sensor sheet 603, base plate 7, screw 8, limiting plate 801. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0035] like Figure 1 、 Figure 2 and Figure 3 As shown, this embodiment provides a grating-type high-precision injection pump, including a substrate 7, to which a syringe fixing part 5 is connected, and a syringe 3 is mounted on the syringe fixing part 5. A grating-type high-precision injection pump in this embodiment also includes a connector 6 and a controller. The substrate 7 is also connected to a grating scale 4 and a mounting platform 1 arranged parallel to each other, a slide 401 is horizontally slidably connected to the grating scale 4, and a slide 101 is horizontally slidably connected to the mounting platform 1.

[0036] The connecting member 6 is connected to the slide 401 and the slide 101, so that the slide 401 and the slide 101 can run synchronously. A driving member for driving the slide 101 to slide is provided on the mounting platform 1; the tail end of the push rod of the syringe 3 is fixed on the connecting member 6; the photoelectric sensor switch 2 is connected to the base plate 7, and the photoelectric sensor switch 2 is an existing slot-type photoelectric sensor switch. A sensing piece 603 is connected to one side of the connecting member 6. The controller is electrically connected to the driving member and the photoelectric sensor switch 2. When the sensing piece 603 moves to the photoelectric sensor switch 2 and triggers the photoelectric sensor switch 2, the controller controls the slide 101 to stop sliding, and at this time the push rod of the syringe 3 is pushed to the bottom of the syringe barrel of the syringe 3.

[0037] In this embodiment, the driving element includes a motor 102 and a screw 103. In this embodiment, the motor 102 is a stepper motor and is fixed to one side of the mounting platform 1 by bolts. One end of the screw 103 is connected to the motor, and the other end of the screw 103 is rotatably connected to the other side of the mounting platform 1. The slide 101 is threadedly engaged with the screw 103. In this embodiment, a slide rail 104 is installed on the mounting platform 1, arranged parallel to the grating scale 4. The slide rail 104 is fixed to the mounting platform 1 by bolts, and the slide 101 is slidably engaged with the slide rail 104.

[0038] Combine Figure 3 As shown, in this embodiment, the connecting member 6 includes a first connecting member 601 and a second connecting member 602, and the first connecting member 601 and the second connecting member 602 each include two side plates and a bottom plate, and the two side plates are vertically connected to the two sides of the bottom plate, the slide 101 is a rectangular parallelepiped, the first connecting member 601 covers the outside of the slide 101 and the bottom plate of the first connecting member 601 is connected to the slide 101 by bolts, and the bottom plate of the second connecting member 602 is connected to the slide plate 401 by bolts; the two side plates of the first connecting member 601 are respectively connected to the sensing plate 603 and the second connecting member 602, and the sensing plate 603 is a metal sensing plate. In this embodiment, the sensing plate 603 and the side plate of the first connecting member 601 are integrally formed or welded or screwed, and the other side plate of the first connecting member 601 is integrally formed or welded with the side plate of the second connecting member 602, and the tail end of the push rod of the syringe 3 is fixed on the second connecting member 602.

[0039] Specific: such as Figure 1 As shown, a U-shaped notch 6022 is provided on a side of the second connecting member 602 close to the syringe 3, and the push rod of the syringe 3 is stuck in the U-shaped notch 6022. The second connecting member 602 is provided with a locking member for locking the tail end of the push rod of the syringe 3. In this embodiment, the locking member includes a screw 8, which is threadedly connected to a side of the second connecting member 602 away from the syringe 3. Tightening the screw 8 can compress the tail end of the push rod of the syringe 3.

[0040] In another embodiment, one end of the screw 8 close to the syringe 3 is connected to a limit plate 801, which is a rectangular plate. The other end of the screw 8 is integrally connected to a nut, which is provided for the convenience of manually twisting the screw 8. In this embodiment, the end of the screw 8 is rotatably matched with the limit plate 801, so that when the screw 8 is tightened, the limit plate 801 will not rotate with the screw 8.

[0041] In another embodiment, the syringe fixing member 5 is provided with a socket for inserting the syringe barrel of the syringe 3 , the socket is a through hole structure, and the socket is arranged horizontally.

[0042] In this embodiment, the syringe holder 5 is a rectangular parallelepiped structure, and a plurality of limiting holes 501 communicating with the insertion hole are provided on the side of the syringe holder 5. In this embodiment, there are three limiting holes 501, which are respectively located on three adjacent sides of the syringe holder 5. The limiting holes 501 are internally threadedly connected to the limiting member, and the syringe barrel of the syringe 3 is limited by tightening the limiting member. In this embodiment, the limiting member can be a screw.

[0043] The mounting platform 1, grating ruler 4, syringe fixing part 5 and photoelectric sensor switch 2 are all detachably connected to the base plate 7. Specifically, they can be detachably fixed to the base plate 7 by bolts or screws, which makes it easy to replace them in time when damaged, with low replacement cost and more convenient installation.

[0044] The specific implementation process is as follows:

[0045] The utility model fixes the slide 101, the slide plate 401 on the grating ruler 4 and the tail end of the push rod of the syringe 3 through the connecting piece 6 to achieve synchronous movement of the three. Through control program design, high-precision syringe pump measurement is achieved.

[0046] 1. Set the syringe origin: fix the syringe push rod 3 to the second connecting piece 602, tighten the screw 8 to press the tail end of the syringe push rod 3 tightly, push the syringe push rod to the bottom of the syringe, and tighten the limiter to lock the syringe.

[0047] 2. Set the origin: Start the motor through the control program to drive the slide 101 to move. The slide 101 drives the slide plate 401 and the sensor plate 603 to move synchronously through the connecting piece 6. When the sensor plate 603 reaches the slot-shaped photoelectric sensor switch 2 and triggers the photoelectric sensor switch 2, the controller controls the slide 101 to stop and sets this point as the reference origin (0 point) of the grating ruler 4.

[0048] 3. Origin calibration: Control the slide 101 to slide beyond the certain stroke limit of the slot-type photoelectric sensor switch 2 (so that the push rod of the syringe is completely pushed to the bottom of the syringe to prevent the push rod from not being completely pushed to the bottom of the syringe due to stroke error). Then retract the grating ruler 4 to set the distance, and then return to the origin. After such a back-and-forth movement, compare the difference between the set distance and the actual number of steps driven by the motor to find the inertial collision error value (± value) to avoid errors caused by step loss of the stepper motor 102.

[0049] 4. Start measuring: According to the required measuring stroke, set the distance length of the grating scale, and add the absolute value of the inertial collision error to get the actual measuring stroke. Finally, the syringe volume can be calculated according to the syringe diameter, so as to accurately obtain the sampling volume of the syringe, thereby realizing accurate detection and measurement, and improving the accuracy of the detection data.

[0050] The structure of the present invention has the integrated effect of multiple functions and features: the high-precision absolute value of the grating ruler 4 is used to achieve no cumulative error over a long stroke, overcoming the problem of increasing cumulative error as the stroke of the traditional injection pump increases, thereby achieving smaller absolute volume error values even for large-capacity measurement; at the same time, the error value of the grating ruler 4 is ±1um, which is a significant improvement over the ±5um accuracy of the traditional stepping motor 102 or servo motor.

[0051] Moreover, through this structural design combined with program verification and origin setting control procedures, assembly errors and component errors can be relaxed, greatly reducing component processing requirements and precision assembly requirements, effectively achieving low cost compatibility with high precision, and batch consistency can be better controlled; overcoming a major drawback of traditional injection pumps that are heavily dependent on high-precision machined parts and precision assembly.

[0052] In addition, compared with the servo motor injection pump, the controller of this structural design is low-cost and easy to control; compared with the ordinary stepper motor 102 injection pump, it can overcome the problem of error caused by lost steps, and has better accuracy and consistency.

[0053] It should be noted that the above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0054] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0055] In the description of this document, the terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only used to illustrate the relative position relationship between the various components or components, and do not particularly limit the specific installation orientation of the various components or components.

[0056] In the descriptions of this document, some terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0057] In this document, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0058] The structures, proportions, sizes, etc. drawn in the drawings in this application are only used to match the contents disclosed in this technical briefing document for those skilled in the art to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0059] The terms used in this document are those commonly used in the art currently in consideration of the functions of the present disclosure, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the document should not be understood as simple names, but rather as a general description based on the meaning of the terms and the present disclosure.

[0060] Flowcharts or text are used in this document to illustrate the operational steps performed according to the embodiments of the present application. It should be understood that the operational steps in the embodiments of the present application are not necessarily performed in the exact order in which they are described. Instead, the various steps may be processed in reverse order or simultaneously, as needed. Furthermore, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0061] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A grating-type high-precision syringe pump, comprising a substrate, a syringe holder connected to the substrate, a syringe mounted on the syringe holder, characterized in that: The device further comprises a connecting member and a controller, wherein the base plate is further connected to a grating ruler and a mounting platform which are arranged parallel to each other, the grating ruler is horizontally slidably connected to a slide plate, the mounting platform is horizontally slidably connected to a slide platform, the connecting member is connected to the slide plate and the slide platform, and the mounting platform is provided with a driving member for driving the slide platform to slide; the tail end of the plunger of the syringe is fixed to the connecting member; A photoelectric sensor switch is connected to the substrate, a sensor sheet is connected to one side of the connector, and the controller is electrically connected to the driving member and the photoelectric sensor switch. When the sensor sheet moves to the photoelectric sensor switch and triggers the photoelectric sensor switch, the controller controls the slide to stop sliding, and at this time the push rod of the syringe is pushed to the bottom of the syringe barrel.

2. A grating-type high-precision injection pump according to claim 1, characterized in that: The driving member includes a motor and a screw rod, one end of the screw rod is connected to the motor, the other end of the screw rod is rotatably connected to one side of the mounting platform, and the slide is threadedly engaged with the screw rod.

3. A grating type high-precision injection pump according to claim 2, characterized in that: The motor is a stepping motor.

4. A grating type high-precision injection pump according to claim 1, characterized in that: A slide rail parallel to the grating ruler is installed on the mounting platform, and the slide platform is in sliding cooperation with the slide rail.

5. A grating type high-precision injection pump according to claim 1, characterized in that: The connecting member includes a first connecting member and a second connecting member, each of the first connecting member and the second connecting member includes two side plates and a bottom plate, and the two side plates are vertically connected to both sides of the bottom plate, the first connecting member covers the outside of the slide and the bottom plate of the first connecting member is connected to the slide, and the bottom plate of the second connecting member is connected to the slide; the two side plates of the first connecting member are respectively connected to the sensor plate and the second connecting member, and the tail end of the push rod of the syringe is fixed to the second connecting member.

6. A grating type high-precision injection pump according to claim 5, characterized in that: A U-shaped notch is provided on a side of the second connecting member close to the syringe, and the push rod of the syringe is clamped on the U-shaped notch. The second connecting member is provided with a locking member for locking the tail end of the push rod of the syringe.

7. A grating type high-precision injection pump according to claim 6, characterized in that: The locking member includes a screw, which is threadedly connected to a side surface of the second connecting member away from the syringe. Tightening the screw can compress the tail end of the push rod of the syringe.

8. A grating type high-precision injection pump according to claim 7, characterized in that: One end of the screw rod close to the syringe is connected to a limiting plate.

9. The grating-type high-precision injection pump according to claim 1, characterized in that: The syringe fixing part is provided with a socket for inserting the syringe barrel, and the socket is arranged horizontally. The side of the syringe fixing part is provided with multiple limiting holes communicating with the socket. The limiting holes are internally threadedly connected to the limiting member, and the syringe barrel of the syringe is limited by tightening the limiting member.

10. A grating-type high-precision injection pump according to any one of claims 1 to 9, characterized in that: The mounting platform, grating ruler, syringe fixing piece and photoelectric sensor switch are all detachably connected to the base plate.

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