CN109909116B - Modular piezoelectric driving precision injection valve - Google Patents
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Abstract
The invention provides a modular piezoelectric driving precise injection valve, which relates to the technical field of dispensing equipment and comprises the following components: a frame provided with a first region, a second region, and a third region; the injection module is arranged in a first area of the frame and comprises a glue solution conveying part and a glue solution injection part; the driving module is arranged in the second area of the frame and comprises a piezoelectric ceramic actuator and a displacement amplification arm, wherein the piezoelectric ceramic actuator and the displacement amplification arm are horizontally arranged; and the temperature control module is arranged in a third area of the frame and is used for controlling the temperature of the glue solution in the glue storage cavity of the nozzle. The invention is suitable for spraying glue solution with large viscosity, and has the advantages of small volume, high glue solution spraying precision, convenient disassembly, cleaning and maintenance of the injection valve and high usability.
Description
Technical Field
The invention relates to the technical field of dispensing equipment, in particular to a modular piezoelectric-driven precise injection valve.
Background
The piezoelectric driving jet valve utilizes the characteristics of piezoelectric materials, drives a jet needle to reciprocate at a high speed through the combination of a voltage actuator and an elastic element, can jet a trace amount of liquid materials, has the characteristics of high efficiency and high precision, and is widely applied in the electronic manufacturing industry. The piezoelectric ceramic actuator and the amplifying mechanism of the existing piezoelectric injection valve are respectively arranged in the vertical direction and the horizontal direction, the displacement input and the displacement output are parallel, the stroke and the movement speed of a needle of the piezoelectric injection valve determine the injection performance of the injection valve, the length of a piezoelectric driver determines the displacement output of the piezoelectric actuator, and the lever length of a mechanical amplifying mechanism determines the amplification factor. And the length of a lever and a piezoelectric driver of the mechanical amplification mechanism cannot be too short to ensure that the spray needle has enough stroke and speed, so that the size of the spray valve in the height and length directions is larger, and the piezoelectric driving spray valve cannot spray high-viscosity glue solution due to small (micron-sized) output displacement and small displacement amplification factor of a piezoelectric stack.
Nowadays, the market has more strict requirements on the performance of the piezoelectric-driven injection valve, and the piezoelectric-driven injection valve is expected to have the characteristics of small size, delicacy and the like. The size of the conventional piezoelectric driving injection valve amplification mechanism is difficult to further reduce, and although the piezoelectric driving injection valve amplification mechanism still can be applied to some applications, the piezoelectric driving injection valve is suitable for injecting glue solution with high viscosity, and the piezoelectric driving injection valve with strong performance and small size is more and more urgent in the technical field of dispensing equipment.
Disclosure of Invention
The invention provides a modular piezoelectric driving precise injection valve, which aims to overcome the defects of the prior art and provide a modular piezoelectric driving precise injection valve which is suitable for injecting glue solution with large viscosity and has small volume.
In order to achieve the above object, the present invention provides a modular piezo-actuated injection valve comprising:
the device comprises a frame, a first region, a second region and a third region are arranged on the frame;
the spraying module is arranged in a first area of the frame and comprises a glue solution conveying part and a glue solution spraying part, the glue solution spraying part comprises a nozzle glue storage cavity, an outlet of the glue solution conveying part is communicated with the nozzle glue storage cavity, the top and the bottom of the nozzle glue storage cavity are respectively provided with a spray needle opening and a nozzle opening, a spray needle is vertically arranged right above the spray needle opening, a funnel-shaped nozzle is arranged on the outer side of the nozzle opening, and the spray needle is used for extruding the glue solution in the nozzle glue storage cavity and controlling the spray of the glue solution at the nozzle;
the driving module is arranged in the second area of the frame and comprises a piezoelectric ceramic actuator and a displacement amplification arm, wherein the first end and the second end of the piezoelectric ceramic actuator are respectively connected with the first end and the second end of the displacement amplification arm, and the piezoelectric ceramic actuator and the displacement amplification arm are horizontally arranged; the first end of the displacement amplification arm is fixedly connected with the inner side wall of the frame, the second end of the displacement amplification arm is fixedly provided with a transmission rod, the bottom of the transmission rod is contacted with the top of the spray needle, and the transmission rod, the spray needle and the nozzle opening are coaxially arranged;
and the temperature control module is arranged in a third area of the frame and is used for heating the glue solution in the glue storage cavity of the nozzle.
The glue solution conveying part comprises a flow channel block, a flow channel is arranged in the flow channel block, an outlet of the flow channel is communicated with the glue storage cavity of the nozzle, an inlet of the flow channel is formed in the first end of the flow channel block, a plug screw is inserted into the inlet of the flow channel, a glue inlet part is arranged right above the inlet of the flow channel, and the top end of the glue inlet part is communicated with a glue barrel.
The glue solution spraying part further comprises a guide sleeve, the guide sleeve is vertically arranged right above the nozzle, and is fixedly connected with the second end of the flow channel block, the nozzle is arranged in the guide sleeve, and the guide sleeve and the nozzle are coaxially arranged.
The top of the spray needle is fixedly provided with a spray needle cap, a first elastic element is further arranged in the guide sleeve, the first elastic element is coaxially sleeved on the spray needle, a first end of the first elastic element is connected with the spray needle cap, and a second end of the first elastic element is connected with a step structure in the guide sleeve.
The injection module is also provided with a plurality of sealing rings which are respectively arranged at the joint of the glue inlet part and the flow channel block, the joint of the plug screw and the flow channel block, the joint of the guide sleeve and the flow channel block and the joint of the injection needle and the guide sleeve; the first area of the frame is also provided with a positioning bead which is used for determining and limiting the position of the runner block in the first area.
The first end and the second end of the piezoelectric ceramic actuator are respectively and fixedly provided with a top block, the first end and the second end of the displacement amplification arm are respectively provided with a connecting block in an upward protruding mode, the inner sides of the two connecting blocks are respectively provided with a notch, and the outer sides of the two top blocks are respectively and convexly arranged in the notches of the two connecting blocks.
And the displacement amplification arm is also horizontally provided with a second elastic element, and the first end and the second end of the second elastic element are respectively fixedly connected with the tops of the two connecting blocks.
The connecting block at the first end of the displacement amplification arm is fixedly connected with the frame through a screw, and the connecting block at the second end of the displacement amplification arm is fixedly connected with the top of the transmission rod through a nut.
The second area of the frame is also provided with a circuit board, and the piezoelectric ceramic actuator is electrically connected with the circuit board.
Wherein, the temperature control module includes a temperature control chamber and a temperature detect passageway, the temperature control chamber with the temperature detect passageway all is located the third region of frame, the first end in temperature control chamber is close to the nozzle stores up gluey chamber, the temperature control chamber with be provided with a heating rod and a platinum resistance in the temperature detect passageway respectively, the heating rod with the platinum resistance all with the circuit board electricity is connected.
The scheme of the invention has the following beneficial effects:
according to the modular piezoelectric driving precise injection valve, the piezoelectric ceramic actuator and the displacement amplification arm of the driving module are horizontally arranged, the displacement in the vertical direction is formed by bending the second end of the displacement amplification arm downwards, the displacement output of the piezoelectric ceramic actuator in the horizontal direction can be converted into the displacement output of the transmission rod in the vertical direction, and compared with an amplification mechanism adopting the traditional lever type amplification principle, the piezoelectric ceramic actuator of the driving module is horizontally arranged, so that the volume of the injection valve is greatly reduced;
the modular piezoelectric driving precise injection valve has larger amplification factor of displacement, the injection needle can obtain larger movement speed, the injection speed and the injection precision of glue solution can be effectively improved, and the modular piezoelectric driving precise injection valve is suitable for glue solution with large viscosity;
the modular piezoelectric driving precise injection valve has the advantages that due to the modular design, the injection valve can meet different injection requirements by replacing related modules, the injection valve is more convenient to disassemble, clean and maintain, and the usability is improved.
Drawings
FIG. 1 is a three-dimensional perspective view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view of the overall construction of the present invention;
FIG. 3 is an enlarged schematic view of a glue solution spraying part according to the present invention;
FIG. 4 is a schematic view of a variation of the displacement amplifying arm of the present invention;
fig. 5 is a graph comparing the speed profiles of two injection valves.
[ description of reference ]
1-a frame; 2-a spray module; 21-glue solution conveying part; 211-a runner block; 212-a flow channel; 213-plug screw; 214-glue feeding; 215-a glue cartridge; 22-glue solution spraying part; 221-nozzle glue storage cavity; 222-nozzle orifice; 223-nozzle opening; 224-a spray needle; 225-nozzle; 226-a guide sleeve; 227-a first resilient element; 3-a drive module; 301-piezoceramic actuators; 302-displacement amplification arm; 303-a transmission rod; 304-a top block; 305-a connection block; 306-a second resilient element; 4-a temperature control module; 401-temperature control chamber; 402-temperature sensing channel; 403-heating rod; 404-platinum resistor; 405-a fabrication hole; 5-sealing ring; 6-positioning beads; 7-a circuit board; 8-connector lug.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a modular piezoelectric driving injection valve, aiming at the problems that the size of the piezoelectric ceramic actuator driver and the amplification mechanism of the traditional piezoelectric driving injection valve are larger and large-viscosity glue solution is difficult to inject because the piezoelectric ceramic actuator driver and the amplification mechanism are respectively arranged in the vertical direction and the horizontal direction.
As shown in fig. 1, an embodiment of the present invention provides a modular piezo actuated injection valve comprising: the device comprises a frame 1, wherein a first area, a second area and a third area are arranged on the frame 1; the injection module 2 is arranged in the first area of the frame 1, the injection module comprises a glue solution conveying part 21 and a glue solution injection part 22, the glue solution injection part 22 comprises a nozzle glue storage cavity 221, an outlet of the glue solution conveying part 21 is communicated with the nozzle glue storage cavity 221, the top and the bottom of the nozzle glue storage cavity 221 are respectively provided with a nozzle opening 222 and a nozzle opening 223, a spray needle 224 is vertically arranged right above the nozzle opening 222, a funnel-shaped nozzle 225 is arranged outside the nozzle opening 223, and the spray needle 224 is used for extruding the glue solution in the nozzle glue storage cavity 221 and controlling the spray of the glue solution at the nozzle 225; a driving module 3, wherein the driving module 3 is disposed in a second region of the frame 1, and comprises a piezoceramic actuator 301 and a displacement amplification arm 302, a first end and a second end of the piezoceramic actuator 301 are respectively connected with a first end and a second end of the displacement amplification arm 302, and the piezoceramic actuator 301 and the displacement amplification arm 302 are both horizontally arranged; the first end of the displacement amplifying arm 302 is fixedly connected with the inner side wall of the frame 1, the second end is fixedly provided with a transmission rod 303, the bottom of the transmission rod 303 is contacted with the top of the spray needle 224, wherein the transmission rod 303, the spray needle 224 and the nozzle opening 223 are coaxially arranged; and the temperature control module 4 is arranged in the third area of the frame 1, and the temperature control module 4 is used for heating the glue solution in the nozzle glue storage cavity 221.
In the modular piezoelectric injection valve according to the above-described embodiment of the present invention, the injection module 2 is disposed in the first region of the frame 1, and is configured to inject the glue solution out of the injection valve. The injection module 2 comprises a glue solution delivery part 21 and a glue solution injection part 22, the glue solution delivery part 21 is used for delivering the glue solution to a nozzle glue storage cavity 221 of the glue solution injection part 22, the nozzle glue storage cavity 221 is a cavity for temporarily storing the glue solution, a nozzle opening 223 is arranged at the bottom of the nozzle glue storage cavity 221, and an elastic nozzle 225 is arranged at the outer side of the nozzle opening 223. The top of the nozzle glue storage cavity 221 is provided with a nozzle opening 222, a nozzle 224 is vertically inserted, the bottom of the nozzle 224 penetrates through the nozzle glue storage cavity 221 and slightly contacts with the funnel-shaped inner wall of the nozzle 225 (a gap is formed in a preset state), the nozzle 224 can vertically move downwards under the action of the driving module 3, the glue solution in the nozzle glue storage cavity 221 is extruded, the pressure state of the glue solution is changed, and the spraying of the glue solution at the nozzle 225 is controlled. The driving module 3 is disposed in a second region of the frame, and includes a piezo-ceramic actuator 301 and a displacement-amplifying arm 302, both of which are horizontally arranged, and first and second ends of the piezo-ceramic actuator 301 are connected to first and second ends of the displacement-amplifying arm 302, respectively. Because the first end of the displacement amplification arm 302 is fixedly connected with the inner side wall of the frame 1, the displacement amplification arm 302 forms a flexible rod which can be bent, the second end of the displacement amplification arm is fixedly provided with a transmission rod 303, and the bottom of the transmission rod 303 is contacted with the top of the spray needle 224, so that the second end of the displacement amplification arm 302 is bent downwards under the action of the piezoceramic actuator 301, the transmission rod 303 is driven to move downwards, and the spray needle 224 is further pushed to move downwards. The transmission rod 303, the needle 224 and the nozzle opening 223 are coaxially arranged, so that accurate driving of the driving module 3 and reliability of control of the needle 224 to the nozzle opening 223 are ensured. One end of the temperature control module 4 arranged in the third area of the frame 1 is close to the nozzle glue storage cavity 221, and the glue solution temporarily stored in the nozzle glue storage cavity 221 is heated and insulated in a heat conduction mode, so that the temperature of the glue solution is kept within a suitable spraying range. According to the modular piezoelectric driving precise injection valve, the piezoelectric ceramic actuator 301 and the displacement amplification arm 302 of the driving module 3 are horizontally arranged, the displacement in the vertical direction is generated by bending the second end of the displacement amplification arm 302 downwards, the displacement output of the piezoelectric ceramic actuator 301 in the horizontal direction can be converted into the displacement output of the transmission rod 303 in the vertical direction, and compared with an amplification mechanism adopting the traditional lever type amplification principle, the piezoelectric ceramic actuator 301 of the driving module 3 is horizontally arranged, and the volume of the injection valve is greatly reduced. Meanwhile, the driving module 3 of the invention has larger magnification, the spray needle 224 can obtain a larger movement speed, and the spray speed and the spray precision of the glue solution can be effectively improved. Therefore, the invention has the advantages of simple structure, convenient use, small volume, high injection precision and the like.
As shown in fig. 2 and 3, the glue solution delivering unit 21 includes a flow channel block 211, a flow channel 212 is disposed in the flow channel block 211, an outlet of the flow channel 212 is communicated with the nozzle glue storage cavity 221, an inlet of the flow channel 212 is disposed at a first end of the flow channel block 211, a plug screw 213 is inserted at the inlet of the flow channel 212, a glue inlet 214 is disposed right above the inlet of the flow channel 212, and a top end of the glue inlet 214 is communicated with a glue cartridge 215.
The glue solution delivering part 21 according to the above embodiment of the present invention includes a flow channel block 211 having a flow channel 212 therein, wherein the nozzle glue storage cavity 221 is disposed inside the second end of the flow channel block 211, and an outlet of the flow channel 212 is connected to the nozzle glue storage cavity 221. The inlet of the flow channel 212 is blocked by a plug screw 213 to prevent the glue solution from flowing out, meanwhile, a channel is arranged right above the inlet, a glue inlet piece 214 is inserted, the top end of the glue inlet piece 214 is communicated with a glue cylinder 215, and the glue cylinder 215 stores the glue solution to be sprayed. Therefore, the glue solution in the glue cartridge 215 can continuously flow into the nozzle glue storage chamber 221 along the channel to ensure that the injection valve can continuously spray glue.
The glue solution spraying part 22 further includes a guide sleeve 226, the guide sleeve 226 is vertically disposed right above the nozzle opening 222 and is fixedly connected to the second end of the flow passage block 211, the nozzle 224 is disposed in the guide sleeve 226, and the guide sleeve 226 and the nozzle 224 are coaxial. A nozzle cap is fixedly arranged at the top of the nozzle 224, a first elastic element 227 is further arranged in the guide sleeve 226, the first elastic element 227 is coaxially sleeved on the nozzle 224, a first end of the first elastic element 227 is connected with the nozzle cap, and a second end of the first elastic element 227 is connected with a step structure in the guide sleeve 226.
The glue solution spraying part 22 according to the above embodiment of the present invention further vertically arranges a guide sleeve 226 right above the needle opening 222, and is fixed at the second end of the flow path block 211. The needle 224 is slidably disposed within the guide sleeve 226, is slidable along the inner sidewall of the guide sleeve 226, and is disposed coaxially with the guide sleeve 226 to ensure the accuracy of the movement of the needle 224 in the vertical direction. The needle cap provided at the tip of the needle 224 has an upper surface above the guide sleeve 226 and contacts the lower surface of the driving rod 303, so that the driving rod 303 can accurately and conveniently push the downward movement of the needle 224 when moving downward. Meanwhile, a first elastic member 227 provided in the guide sleeve 226 coaxially fits over the needle 224, and has a first end connected to the needle cap and a second end connected to a step structure in the guide sleeve 226. When the piezoceramic actuator 301 is in a high-pressure state, the displacement of the piezoceramic actuator is increased, the displacement amplification arm 302 drives the transmission rod 303 to move downwards and the spray needle 224 moves downwards, the first elastic element 227 is compressed by the spray needle cap, when the piezoceramic actuator 301 is in a low-pressure state, the displacement of the piezoceramic actuator is reduced, the displacement amplification arm 302 and the transmission rod 303 gradually reset, at the moment, the spray needle 224 moves upwards under the restoring force of the first elastic element 227, and the glue solution refills the nozzle glue storage cavity 221 so as to ensure the repeated glue spraying of the spray valve.
The injection module 2 is further provided with a plurality of sealing rings 5, and the sealing rings 5 are respectively arranged at the connection position of the glue inlet part 214 and the flow channel block 211, the connection position of the plug screw 213 and the flow channel block 211, the connection position of the guide sleeve 226 and the flow channel block 211, and the connection position of the spray needle 224 and the guide sleeve 226; the first area of the frame 1 is further provided with a positioning bead 6, and the positioning bead 6 is used for determining and limiting the position of the flow passage block 211 in the first area.
The plurality of sealing rings 5 provided on the injection module 2 according to the above embodiment of the present invention are used to seal each connection position of the glue solution channel, so as to prevent the glue solution from leaking from other positions of the flow channel block 211. A positioning bead 6 is arranged in the first area of the frame 1, the bottom of the positioning bead 6 is located at a preset position on the upper surface of the first end of the flow channel block 211, and the flow channel block 211 is ensured to be accurately installed in the first area of the frame 1, so that the accuracy of the positions of the openings of the first end and the second end of the flow channel block is ensured.
The first end and the second end of the piezoceramic actuator 301 are further respectively fixedly provided with a top block 304, the first end and the second end of the displacement amplification arm 302 are respectively provided with a connecting block 305 in an upward protruding manner, the inner sides of the two connecting blocks 305 are respectively provided with a notch, and the outer sides of the two top blocks 304 are respectively convexly arranged in the notches of the two connecting blocks 305. A second elastic element 306 is further horizontally disposed on the displacement amplifying arm 302, and a first end and a second end of the second elastic element 306 are respectively fixedly connected to the tops of the two connecting blocks 305. The connecting block 305 at the first end of the displacement amplifying arm 302 is fixedly connected with the frame 1 through a screw, and the connecting block 305 at the second end of the displacement amplifying arm 302 is fixedly connected with the top of the transmission rod 303 through a nut.
In the driving module 3 according to the above embodiment of the present invention, the first end and the second end of the displacement amplifying arm 302 are respectively provided with the connecting block 305 in an upward protruding manner, so that the displacement amplifying arm 302 forms a dumbbell-like shape (asymmetric), and the piezoceramic actuator 301 therein is fittingly ejected into the recess inside the connecting block 305 through the ejecting blocks 304 on the first end and the second end, so as to ensure that the displacement of the piezoceramic actuator 301 can be accurately fed back to the displacement amplifying arm 302. When the piezoceramic actuator 301 is in a high-pressure state and extends, the top block 304 acts on the displacement amplification arm 302, the displacement amplification arm 302 is deformed by a horizontal force, because the connection block 305 at the first end of the displacement amplification arm 302 is fixedly connected with the frame 1 through a screw, the displacement amplification arm 302 forms a flexible rod, and the direction of the horizontal force applied to the displacement amplification arm 302 is not on the same straight line with the center of the flexible hinge, the flexible hinge is rotated by a torque action, so that the displacement amplification arm 302 bends downwards, the connection block 305 at the second end and the transmission rod 303 generate vertical downward displacement, and therefore the displacement amplification arm 302 displaces the displacement S of the piezoceramic actuator 301 in the horizontal directioninAmplified to a displacement S in the vertical direction of the transmission rod 303outAs shown in fig. 4, the magnification factor is the ratio of the distance from the axis of the transmission rod 303 to the center of the flexible hinge to the distance from the position of the top block 304 acting on the displacement-magnifying arm 302 to the center of the flexible hinge. Meanwhile, a first end and a second end of the second elastic element 306 horizontally arranged on the displacement amplification arm 302 are respectively and fixedly connected with the tops of the two connecting blocks 305, and are used for providing pretightening force for the displacement amplification arm 302 and the piezoelectric ceramic actuator 301, so that the rigidity of the whole driving module 3 is improved.
Wherein, the second area of the frame 1 is further provided with a circuit board 7, and the piezoceramic actuator 301 is electrically connected with the circuit board 7. The circuit board 7 is electrically connected with a controller through a connector lug 8 at the top end of the frame 1, and is used for collecting data and feeding back the data to the controller, so that the controller can conveniently send instructions to control the piezoelectric ceramic actuator 301 and the like.
Wherein, temperature control module 4 includes a temperature control chamber 401 and a temperature detect passageway 402, temperature control chamber 401 with temperature detect passageway 402 all is located the third region of frame 1, the first end of temperature control chamber 401 is close to the nozzle stores up gluey chamber 221, temperature control chamber 401 with be provided with a heating rod 403 and a platinum resistance 404 in the temperature detect passageway 402 respectively, heating rod 403 with platinum resistance 404 all with circuit board 7 electricity is connected.
The temperature control module 4 according to the above embodiment of the present invention heats the glue solution in the nozzle glue storage chamber 221 by the heat emitted from the heating rod 403, so that the temperature of the glue solution is kept in a range suitable for spraying, and the platinum resistor 404 collects the variation data of the resistance of the platinum resistor 404 according to its own characteristics by the circuit board 7, and then adjusts the power of the heating rod 403 by the controller, that is, the platinum resistor 404 is equivalent to a thermometer. In addition, the temperature control chamber 401 and the temperature detection channel 402 are communicated with the outside through a process hole 405, which facilitates the processing of the temperature control chamber 401 and the temperature detection channel 402 and the installation of the heating rod 403 and the platinum resistor 404.
Fig. 5 is a graph showing a comparison of needle velocity curves of an old injection valve using an amplification mechanism of the conventional lever amplification principle and an injection valve of the present invention using a horizontal displacement amplification mechanism. Because the horizontal displacement amplifying arm 302 has a large amplification factor, under the condition that the length directions of the two injection valves are approximately the same, the stroke of the needle 224 generated by the horizontal displacement amplifying arm 302 is increased, the stroke and the downward movement speed of the needle 224 determine the injection performance of the injection valves, and the movement speed of the needle 244 is obviously increased due to the increase of the stroke of the needle 224. Wherein the dotted line is the velocity curve diagram of the injection valve needle 224 of the amplification mechanism adopting the traditional lever type amplification principle, the solid line is the velocity curve diagram of the injection valve needle 224 adopting the horizontal displacement amplification arm 302, and the comparison shows that the downward movement velocity of the injection valve needle 224 adopting the horizontal displacement amplification arm 302 is obviously increased, and the increment reaches 100%.
While the preferred embodiment and comparative examples of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the principles of the invention and these changes and modifications should be considered within the scope of the invention.
Claims (8)
1. A modular piezo-actuated precision injection valve comprising:
the device comprises a frame, a first region, a second region and a third region are arranged on the frame;
the spraying module is arranged in a first area of the frame and comprises a glue solution conveying part and a glue solution spraying part, the glue solution spraying part comprises a nozzle glue storage cavity, an outlet of the glue solution conveying part is communicated with the nozzle glue storage cavity, the top and the bottom of the nozzle glue storage cavity are respectively provided with a spray needle opening and a nozzle opening, a spray needle is vertically arranged right above the spray needle opening, a funnel-shaped nozzle is arranged on the outer side of the nozzle opening, the spray needle is used for extruding the glue solution in the nozzle glue storage cavity and controlling the spray of the glue solution at the nozzle, and the spray needle and the nozzle opening are coaxially arranged;
the driving module is arranged in the second area of the frame and comprises a piezoelectric ceramic actuator and a displacement amplification arm, wherein the first end and the second end of the piezoelectric ceramic actuator are respectively connected with the first end and the second end of the displacement amplification arm, and the piezoelectric ceramic actuator and the displacement amplification arm are horizontally arranged; the first end of the displacement amplification arm is fixedly connected with the inner side wall of the frame, the second end of the displacement amplification arm is fixedly provided with a transmission rod, and the bottom of the transmission rod is in contact with the top of the spray needle;
the temperature control module is arranged in a third area of the frame and is used for accurately controlling the temperature of the glue solution in the glue storage cavity of the nozzle;
the first end and the second end of the piezoelectric ceramic actuator are respectively and fixedly provided with a top block, the first end and the second end of the displacement amplification arm are respectively provided with a connecting block in an upward protruding manner, the inner sides of the two connecting blocks are respectively provided with a notch, and the outer sides of the two top blocks are respectively and convexly arranged in the notches of the two connecting blocks;
and a second elastic element is horizontally arranged on the displacement amplification arm, and the first end and the second end of the second elastic element are respectively and fixedly connected with the tops of the two connecting blocks.
2. The modular piezoelectric-driven precise injection valve as claimed in claim 1, wherein the glue solution delivery part comprises a flow passage block, a flow passage is arranged in the flow passage block, an outlet of the flow passage block is communicated with the glue storage cavity of the nozzle, an inlet of the flow passage block is arranged at the first end of the flow passage block, a plug screw is inserted at the inlet of the flow passage block, a glue inlet member is arranged right above the inlet of the flow passage block, and the top end of the glue inlet member is communicated with a glue barrel.
3. The modular piezoelectric driven precise injection valve as claimed in claim 2, wherein the glue injection part further comprises a guide sleeve vertically disposed over the nozzle and fixedly connected to the second end of the flow passage block, the nozzle is disposed in the guide sleeve, and the guide sleeve and the nozzle are coaxially disposed.
4. The modular piezo-actuated precision injection valve of claim 3 wherein a needle cap is fixedly disposed on the top of the needle, a first resilient member is disposed in the guide sleeve and coaxially disposed on the needle, the first resilient member having a first end connected to the needle cap and a second end connected to a step structure in the guide sleeve.
5. The modular piezoelectric driven precise injection valve as claimed in claim 4, wherein a plurality of sealing rings are further arranged on the injection module, and the sealing rings are respectively arranged at the joint of the glue inlet member and the flow passage block, the joint of the plug screw and the flow passage block, the joint of the guide sleeve and the flow passage block, and the joint of the needle and the guide sleeve; the first area of the frame is also provided with a positioning bead which is used for determining and limiting the position of the runner block in the first area.
6. The modular piezo-actuated precision injection valve of claim 1 wherein the connecting block at the first end of the displacement amplifying arm is fixedly connected to the frame by a screw and the connecting block at the second end of the displacement amplifying arm is fixedly connected to the top of the transmission rod by a nut.
7. The modular piezo-actuated precision injection valve of claim 1 wherein the second region of the frame is further provided with a circuit board, the piezo-ceramic actuator being electrically connected to the circuit board.
8. The modular piezo-actuated precision injection valve of claim 7, wherein the temperature control module comprises a temperature control chamber and a temperature sensing channel, the temperature control chamber and the temperature sensing channel are both located in the third region of the frame, the first end of the temperature control chamber is close to the nozzle glue storage chamber, a heating rod and a platinum resistor are respectively disposed in the temperature control chamber and the temperature sensing channel, and the heating rod and the platinum resistor are both electrically connected to the circuit board.
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| CN109569955B (en) * | 2017-09-29 | 2021-10-08 | 精工爱普生株式会社 | Displacement amplification mechanism and liquid ejecting apparatus using the same |
| CN108144789B (en) * | 2018-01-23 | 2024-01-30 | 广州市景泰科技有限公司 | Injection valve |
| CN208512915U (en) * | 2018-06-15 | 2019-02-19 | 深圳微斯克科技有限公司 | Spraying type dispensing valve |
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2019
- 2019-04-10 CN CN201910285948.9A patent/CN109909116B/en active Active
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