CN203463247U - Injection pump and injection system - Google Patents

Abstract

The utility model provides an injection pump, which comprises: a base; a motor installed on the base, a syringe tube pressing block, and three X-direction parallel guide rods; a lead screw driven by the motor; a syringe handle assembly Mechanism, which has three guide holes, a syringe handle limit groove and a drive hole; the lead screw cooperates with the drive hole to form a screw pair, and the guide rod cooperates with the guide hole to form a sliding pair; the The centers of the three guide holes are located on the three vertices of the equilateral triangle, the center of the driving hole is located at the center of the equilateral triangle, and the axis of symmetry of the stop groove of the syringe handle is aligned with that of the equilateral triangle. Z coincides with the midline. The utility model also provides an injection system capable of realizing parallel control. The utility model has the advantages of high injection precision and strong versatility.

Description

Syringe pumps, injection systems

technical field

The utility model relates to the field of chemical drug injection for chemical experiments and detection, in particular to an injection device and an injection system for fluid chemical drugs in chemical experiments.

Background technique

As microfluidic chips are widely used in various chemical experiments and tests in recent years, in one experiment, the injection rate and sequence of injection of multiple drugs may be required, and sometimes several drugs must be realized during the experiment. Simultaneous injection in different proportions. Therefore, the performance requirements of the injection system are becoming more and more stringent. It is required that they can inject accurately according to the set injection rate, and it is also required that the operator can easily set up the cooperative work of each pump.

At present, although there are some syringe pump systems at home and abroad, most of their design of the circuit control unit is centered on one pump, and then the pumps are cascaded to control other pumps. This design is for those who need multiple pumps to work together Operator operation has brought a lot of operational inconvenience. At the same time, they generally adopt the motor screw rod and the two guide rods to be on the same horizontal plane in the design of the pump body, so that during the motor propulsion process, the thrust efficiency of the motor on the syringe is not high. The generally used stepping motor real-time speed measurement system is not accurate enough, and at the same time, most of them are inconvenient to operate directly on the computer.

For example, in the Chinese invention patent application with application number: 201310042655.0, application date: 2013-02-04, and invention name: "a syringe pump transmission device", the push rod and the two guide rails are on the same XY plane, and at the same time, the wire The rod (screw) is also basically located on the XY plane or at a small distance, thereby achieving a compact structure. However, as schematically shown in Figure 1 of this specification, in actual work, after the syringe is clamped on the syringe pump, the lead screw 3 will drive the drive mechanism 4 to move the syringe handle X to push the medicine out of the syringe. At this time, the syringe handle will give the driving mechanism 4 a reaction force f, which makes the driving mechanism 4 tend to turn in the direction of the arrow A in FIG. And stress concentration occurs at position B where it cooperates with guide rails or push rods 1 and 2, thereby accelerating wear at positions B and C. In this case, when the syringe is initially clamped, the driving mechanism 4 still maintains the correct position as shown by the solid line in Figure 1, but after starting to work, under the action of f, the driving mechanism will take place as shown by the dotted line in Figure 1 The tilt shown affects injection accuracy. In the case that the driving mechanism 4 does not directly cooperate with the guide rail and the lead screw, the effect of f will eventually be transmitted to other components that cooperate with the guide rail and the lead screw, so the above-mentioned problems will also occur, and will not be described in detail herein. In the above invention patent application, the disclosed syringe pump belongs to the field of medical devices. When injecting the human body, the syringe handle is pushed slowly and uniformly. First, the reaction force f is not large, so the wear is slow; secondly, the injection volume depends on For the dosage prescribed by the doctor, it is generally required to push all the medicine in the syringe into the human body. The accuracy requirement is not high, and a small amount of wear is acceptable. In the chemical industry, the injection of chemicals generally requires a large propulsion force (such as high-pressure propulsion), so f is also large and wears quickly, and micro-injection is often performed, which requires high precision, so wear will affect the injection accuracy. It has a great impact, which in turn affects the results of chemical experiments and detection results.

In the Chinese invention patent application with application number: 201210516343.4, application date: 2012-12-05, and invention name: "a gas chromatograph sampling system and processing method", the control system is used to control the action of the reversing device, so that the Different measured samples are injected into the chromatographic column for analysis, which ensures the simultaneity and accuracy of sample injection. However, the control system implements single-line control, which can only guarantee the injection of one sample to be tested at the same time point. In chemical experiments, it is often necessary to inject multiple chemicals at the same time, or within a certain period of time, both Simultaneous injection of various chemicals and staged injection of a certain chemical, and strict requirements on the sequence of chemical injection, and different injection speeds, therefore, it is necessary to control the injection of chemicals in parallel.

Furthermore, there are two types of general syringe handles, one is a common medical syringe, and an end plate is arranged at the end of the syringe handle, which is common in medical syringes; the other is that the rear end of the syringe handle has a screw hole. These two forms are commonly used in experiments, but the driving mechanism of a general syringe pump is only suitable for driving a single type of syringe, and its versatility is not strong.

Utility model content

The first purpose of the utility model is to provide a syringe pump with higher injection precision.

In order to achieve the above object, the utility model provides the following technical solutions:

A syringe pump, comprising: a base; a motor mounted on the base, a syringe tube pressing block, and three guide rods parallel to the X direction; a lead screw driven by the motor; a syringe handle assembly mechanism, which has three a guide hole, a syringe handle limit groove and a drive hole; the screw is matched with the drive hole to form a screw pair, and the guide rod is matched with the guide hole to form a sliding pair; the three guide holes The center of the drive hole is located on the three vertices of the equilateral triangle, the center of the driving hole is located at the center of the equilateral triangle, and the symmetry axis of the syringe handle limiting groove coincides with the Z-direction midline of the equilateral triangle.

Preferably, the limit groove of the syringe handle includes a vertical groove and/or a T-shaped groove.

Preferably, the above syringe pump further includes a syringe handle pressing block, the syringe handle pressing block is in sliding fit with at least two of the three guide rods, and the syringe handle pressing block and the syringe handle assembly mechanism are tightened by bolts. solid, and a stepped groove is opened on the syringe handle pressing block.

Preferably, the syringe handle pressing block has left and right limit rods.

Preferably, the syringe handle limiting groove includes a vertical groove and a T-shaped groove, and the vertical groove is a long hole opened on the bottom wall of the T-shaped groove.

Another object of the present utility model is to provide an injection system capable of parallel control and high injection accuracy.

In order to achieve the above object, the utility model provides the following technical solutions:

An injection system, comprising: the injection pump as described above; a control unit; a rotary encoder; the control unit is electrically connected to multiple injection pumps, and controls multiple injection pumps according to the set timing parameters and injection speed parameters In the working state of the syringe pump, the rotary encoder is electrically connected with the control unit and the motor so as to feed back the rotation speed of the motor to the control unit.

Preferably, the control unit has a human-computer interaction interface.

Preferably, the control unit has a communication interface with a computer.

The beneficial effects of the utility model are:

Since the centers of the three guide holes of the syringe handle assembly mechanism (which is also the driving mechanism of the syringe handle) are located on the three vertices of an equilateral triangle, and the centers of the driving holes are located at the center of the equilateral triangle, the lead screw The thrust is evenly distributed at the three guide holes, and since the symmetry axis of the syringe handle limit groove coincides with the Z-direction midline of the equilateral triangle, the reaction force f of the syringe handle is evenly distributed to the three guide holes to the maximum extent. and the position of the drive hole, so that the stress concentration generated at these positions is very small, thereby reducing wear, so that the syringe handle assembly mechanism will not tilt, and the actual stroke of the syringe handle assembly mechanism strictly corresponds to the set injection volume, so that Improved injection accuracy.

Further, the utility model is provided with different syringe handle limiting grooves for different syringe handle forms, which improves the versatility.

Further, when there is a T-shaped groove, a syringe handle pressing block is added at the same time to ensure that when the end of the syringe handle is an end plate, the injection direction after clamping is parallel to the X direction, which improves the injection accuracy, and the stepped groove on the pressing block It is suitable for the positioning of syringes with different volumes, which improves the versatility, and has the function of assisting positioning to ensure that the injection direction is parallel to the X direction.

Further, the limit rod on the syringe handle pressing block can ensure that the relative position between the pressing block and the syringe handle assembly mechanism remains unchanged, and it is easy to adjust the level of the syringe (parallel to the X direction) when clamping the syringe.

Furthermore, the T-shaped groove and the vertical groove structure of the present invention are adopted at the same time, so the versatility is stronger and the processing is simpler.

On the other hand, the injection system of the utility model adopts closed-loop feedback automatic control, and the control unit has the function of timing parameter setting. While improving the injection accuracy, it can realize the parallel control of multiple injection pumps, and realize different medicines according to different speeds and different injection rates. sequential injection.

Further, the man-machine interface of the control unit is easy to operate.

Further, after the control unit communicates with the computer, the injection pump can be directly programmed on the computer, which improves the convenience and controllability.

Furthermore, the utility model can also select the injection system as a single working mode or a multiple working mode, which has strong versatility.

Description of drawings

Next, specific embodiments of the present utility model will be described in further detail in conjunction with the accompanying drawings, wherein:

Fig. 1 is a force schematic diagram of a syringe pump in the prior art;

Fig. 2 is an axonometric view of the syringe pump of the embodiment of the present invention;

Fig. 3 is a left view of the syringe handle assembly mechanism of the embodiment of the present invention;

Fig. 4 is an axonometric view of a syringe pump according to an embodiment of the present invention, in which some components are omitted for clarity;

Fig. 5 is an axonometric view of another angle of the syringe pump in Fig. 4;

Fig. 6 is a schematic diagram of the structure of the injection system of the embodiment of the present invention.

Explanation of marks in the above figure: guide rail or push rod 1, 2, lead screw 3, driving mechanism 4, syringe pump 100, 200, base 110, syringe tube pressing block 120, syringe handle pressing block 130, left limit rod 131, Right limit rod 132, threaded holes 133, 134, step groove 135, left guide rod 141, right guide rod 142, lower guide rod 143, syringe handle assembly mechanism 150, left guide hole 151, right guide hole 152, lower guide hole 153, drive hole 154, nut 155, right limit hole 156, left limit hole 157, through holes 158, 159, T-shaped slot 1510, vertical slot 1511, motor 160, rotary encoder 170, lead screw 180, control Unit 300, computer 400.

Detailed ways

In the following description, for the sake of clarity, a three-dimensional coordinate system is established, where the X direction refers to the length direction (injection direction) of the syringe pump, the Z direction refers to the height direction (up and down direction) of the syringe pump, and the Y direction refers to the Refers to the width direction (left and right direction) of the syringe pump.

Referring to Figure 1, the syringe pumps in the prior art generally use two guide rails, and the two guide rails (or called guide rods) or push rods 1 and 2 are arranged in parallel in the same plane, and are used to push the driving mechanism of the syringe handle 4 is driven by the lead screw 3 to move in the X direction, and generally in consideration of reducing the size, the distance between the lead screw 3 and the plane where the two guide rails 1 and 2 are located in the Z direction is not very large. After the syringe (not shown) is clamped on the syringe pump, the lead screw 3 will drive the driving mechanism 4 to move to push the syringe handle to X direction to push the medicine out of the syringe. At this time, the syringe handle will give the driving mechanism 4 a reaction force f, which makes the driving mechanism 4 tend to turn in the direction of the arrow A in FIG. And stress concentration occurs at position B where it cooperates with guide rails or push rods 1 and 2, thereby accelerating wear at positions B and C. In this case, when the syringe is initially clamped, the driving mechanism 4 still maintains the correct position as shown by the solid line in Figure 1, but after starting to work, under the action of f, the driving mechanism will take place as shown by the dotted line in Figure 1 The tilt shown affects injection accuracy. In the case that the driving mechanism 4 does not directly cooperate with the guide rail and the lead screw, the effect of f will eventually be transmitted to other components that cooperate with the guide rail and the lead screw, so the above-mentioned problems will also occur, and will not be described in detail herein. If in the medical field, the injection pump of the prior art is used to slowly push the syringe handle at a uniform speed when injecting the human body, firstly, the reaction force f is not large, so the wear is slow; secondly, the injection volume depends on the medicine prescribed by the doctor For the dosage, it is generally required to push all the medicine in the syringe into the human body. The accuracy requirement is not high, and a small amount of wear is acceptable. In the chemical industry, the injection of chemicals generally requires a large propulsion force (such as high-pressure propulsion), so f is also large and wears quickly, and micro-injection is often performed, which requires high precision, so wear will affect the injection accuracy. It has a great impact, which in turn affects the results of chemical experiments and detection results.

With reference to Fig. 2, syringe pump 100 comprises base 110, the motor 160 that is installed on the base 110, syringe tube briquetting block 120, left guide rod 141, right guide rod 142, lower guide rod 143 (shown in Fig. 4 and Fig. 5 out). Three guide rods 141 , 142 , 143 are arranged parallel to the X direction on the base 110 , and are slidably matched with the syringe handle assembly mechanism 150 to form a pair of sliding pairs. The lead screw 180 is driven by the motor 160, and the lead screw 180 cooperates with the syringe handle assembly mechanism 150 to form a pair of lead screw pairs. During operation, the syringe (not shown) is clamped to the syringe pump 100 , the syringe tube pressing block 120 is used to press the front end of the syringe, and the syringe handle assembly mechanism 150 is used to fix the syringe handle. The motor 160 is the power source, and the rotation of the motor 160 is converted into the X-direction linear motion of the syringe handle assembly mechanism 150 through the lead screw 180, thereby pushing the syringe handle, so that the chemicals in the syringe are injected into the experimental device or the detection device. Therefore, the syringe handle assembly mechanism 150 is also a driving mechanism.

Referring to Fig. 3, Fig. 4 and Fig. 5, the three guide holes of the syringe handle assembly mechanism 150 are respectively the left guide hole 151, the right guide hole 152 and the lower guide hole 153, and the centers C1, C2 and C3 of the three guide holes are located at the On the three vertices of the side triangle (as shown by the dotted line in FIG. 3 ), and the center H of the driving hole 154 is located at the center of the equilateral triangle. Therefore, the thrust of the lead screw 180 is evenly distributed at the three guide holes 151 , 152 , 153 . The left guide rod 141 is slidably matched with the left guide hole 151, the right guide rod 142 is slidably fitted with the right guide hole 152, the lower guide rod 153 is slidably fitted with the lower guide hole 153, and the leading screw 180 is matched with the drive hole 154. In order to increase wear resistance, copper sleeves (not shown) can also be arranged in the guide holes 151 , 152 , 153 . Those of ordinary skill in the art can easily imagine that in order to realize the screw drive, the nut 155 can be installed in the driving hole 154, and the internal thread can also be directly machined in the driving hole 154, which is collectively referred to as the screw 160 in this specification. Cooperate with the driving hole 154 to form a lead screw pair. In order to improve versatility, in this utility model, the syringe handle limit groove adopts two forms: one is a T-shaped groove 1510 (from a top view, it is roughly T-shaped), which is suitable for assembling a syringe with an end plate. The syringe handle; the other is the vertical groove 1511, which is suitable for the situation where the end of the syringe handle has a threaded hole. Those of ordinary skill in the art can easily imagine that the two types of syringe handle limiting grooves can be used alone or at the same time, or other shapes of limiting grooves can be processed. But from the point of view of improving versatility, it is preferable to adopt T-shaped groove 1510 and vertical groove 1511 at the same time. At this time, vertical groove 1511 itself is a long hole opened on the bottom wall of T-shaped groove 1510, so two The limit slot can be regarded as a whole, and from the machining point of view, for example, when the limit slot is processed by milling, the milling cutter can mill the vertical position by locally increasing the feed rate of the milling cutter on the basis of milling the T-shaped slot 1510. The slot 1511 is easy to realize. Moreover, the symmetry axis of the syringe handle limiting grooves 1510, 1511 coincides with the Z-direction midline of the above-mentioned equilateral triangle, as shown by the long dotted line in FIG. 3 . Therefore, the reaction force f of the syringe handle shown in FIG. The distance between the centerline and the centerline of the lower guide hole 153 is greater than the distance between it and the centerline of the syringe handle. According to the principle of leverage, the sliding friction of the lower guide rod 143 is the smallest, while the two horizontal guide rods 141, The sliding friction force of 142 is average, which greatly reduces the degree of wear, so that the syringe handle assembly mechanism 150 does not tilt as shown by the dotted line in Figure 1, and the actual stroke of the syringe handle assembly mechanism 150 strictly corresponds to the set injection volume. Thereby improving the injection accuracy.

Simultaneously, since the T-shaped groove 1510 is adopted, the utility model is also provided with a syringe handle pressing block 130 matched therewith. The syringe handle pressing block 130 is slidingly fitted with the left guide rod 141 and the right guide rod 142 . Threaded holes 133, 134 are provided on the syringe handle pressing block 130. Correspondingly, through holes 158, 159 are provided on the syringe handle assembly mechanism 150. After the end plate of the syringe handle is snapped into the T-shaped slot 1510, a bolt passes through the through hole 158, 159 are screwed into the threaded holes 133, 134, so that the syringe handle pressing block 130 is pressed against the syringe handle. In order to ensure that the relative position between the syringe handle pressing block 130 and the syringe handle assembly mechanism 150 remains unchanged, it is easy to adjust the level of the syringe (parallel to the X direction) when clamping the syringe, and a left limit position is also set on the syringe handle pressing block 130 The rod 131 and the right limiting rod 132 are correspondingly provided with a left limiting hole 157 and a right limiting hole 156 on the syringe handle assembly mechanism 150 . Moreover, in order to adapt to syringes of different capacities (the diameters of which are also different), a stepped groove 135 is formed on the syringe handle pressing block 130 .

Referring to Fig. 6, in the embodiment of the present utility model, the control unit 300 is electrically connected with the two injection pumps 100, 200, and is used to control the operation of the motors 160 of the two injection pumps. Those of ordinary skill in the art should understand that the control unit 300 can also control one or more syringe pumps, but in the chemical industry, in order to realize the injection of various chemicals, the control unit 300 should control two or more syringe pumps injection. On the syringe pumps 100 and 200 , a rotary encoder 170 is also installed for measuring the rotation speed of the motor 160 . At the same time, the rotary encoder 170 is also connected to the control unit 300 to feed back the measured rotational speed signal to the control unit 300 . The control unit 300 controls the working state of the syringe pumps 100 and 200 according to the set timing parameters and injection speed parameters. During the working process, the rotary encoder 170 feeds back the rotational speed of the motor 160 to the control unit 300, and the control unit 300 Compare the speed value with the preset speed, and use some intelligent algorithms (currently the main algorithm used is the proportional-integral-derivative control algorithm, referred to as PID control algorithm), calculate the next step to drive the motor 160 signal to make the motor speed closer to the theory value, thereby improving the injection accuracy. Moreover, the control unit 300 has a human-computer interaction interface, which is convenient for operators to input on-site parameters. As a further preferred solution, the control unit 300 also provides a communication interface with the computer 400. In some occasions with a computer 400, the control unit 300 can be connected to the computer 400, and then the syringe pumps 100, 200 are set on the computer 400. Run the program, in this way, the control unit 300 itself may not have a human-computer interaction interface, but is controlled by a portable computer, which is conducive to the miniaturization of the control unit 300, especially in some occasions where the computer 400 is required to control other instruments at the same time, it can 400 to realize the operation of the whole system and improve the versatility.

When utilizing the injection system of the present invention to inject chemicals, the steps are as follows:

(1) Attach syringes containing different liquids to the respective syringe pumps 100 , 200 .

(2) Enter the operation interface of the control unit 300 and select a single working mode or a multiple working mode.

(3) Set the program with time as the main line, first select the first syringe pump 100, press and then select a specific time period, then set the parameters required for the syringe pump 100 to complete the task during this period, and then enter the next time period Setting, until the parameters of all the time periods of the syringe pump, including the injection start time, end time, injection speed, etc. analogy. Although the parameters of each syringe pump are individually input, the parameters of each syringe pump are set according to the tasks to be completed by the entire system. Therefore, different injections can be easily realized by adjusting the parameter settings of each syringe pump. The injection sequence and injection rate of the pump.

(4) After completing all the settings of the syringe pump, start the injection.

(5) The injection is terminated.

It can be seen from the above that the injection system of the present invention is especially suitable for occasions where it is necessary to realize injections with various concentration changes.

Although the utility model is described in conjunction with the above embodiments, the utility model is not limited to the above embodiments, and those skilled in the art can easily perform equivalent replacements and modifications without departing from the utility model the scope of protection of the claims.

Claims (8)

1. A syringe pump comprising: base; A motor, a syringe tube pressing block, and three X-direction parallel guide rods installed on the base; a lead screw driven by said motor; The syringe handle assembly mechanism has three guide holes, a syringe handle limiting groove and a driving hole; The lead screw cooperates with the driving hole to form a screw pair, and the guide rod cooperates with the guide hole to form a sliding pair; It is characterized in that the centers of the three guide holes are located on the three vertices of an equilateral triangle, the center of the driving hole is located at the center of the equilateral triangle, and the axis of symmetry of the stop groove of the syringe handle is aligned with the center of the equilateral triangle. The Z-direction midlines of the equilateral triangles coincide. 2 . The syringe pump according to claim 1 , wherein the syringe handle limiting groove comprises a vertical groove and/or a T-shaped groove. 3. The syringe pump according to claim 2, further comprising a syringe handle pressing block, the syringe handle pressing block is in sliding fit with at least two of the three guide rods, and the syringe handle pressing block The assembling mechanism with the syringe handle is fastened by bolts, and a step groove is opened on the pressure block of the syringe handle. 4. The syringe pump according to claim 3, characterized in that, there are left and right limit rods on the said syringe handle pressing block. 5. The syringe pump according to claim 2 or 3, wherein the syringe handle limiting groove includes a vertical groove and a T-shaped groove, and the vertical groove is opened on the bottom wall of the T-shaped groove long hole on the 6. An injection system, characterized in that it comprises: A syringe pump as claimed in any one of claims 1 to 5; control unit; Rotary encoder; The control unit is electrically connected to multiple injection pumps, and controls the working states of multiple injection pumps according to the set timing parameters and injection speed parameters. The rotary encoder is connected to the control unit and the The motor is electrically connected to feed back the rotational speed of the motor to the control unit. 7. The injection system according to claim 6, wherein the control unit has a human-machine interface. 8. The injection system according to claim 6 or 7, wherein the control unit has a communication interface with a computer.

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