Novel droplet jet forming device

Abstract

The utility model discloses a novel microdroplet jet forming device, which relates to the field of micro piezoelectric jet and comprises a nozzle, a connector is integrally formed at the top end of the nozzle, downward concave grooves are arranged at two ends of the inner wall of the connector, a piezoelectric electrode structure is mounted at an opening at the top end of the connector, and the piezoelectric electrode structure is connected with the nozzle. A conductive electrode structure connected with the piezoelectric electrode structure is mounted on the inner wall of the groove; an input pipe is integrally formed on one side of the periphery of the nozzle, a valve film is connected to the upper portion of the inner wall of a transverse pipe part of the input pipe, the upper portion of the periphery of the valve film is fixedly connected with the inner wall of the input pipe, and other positions of the periphery of the valve film are attached to the inner wall of the input pipe. And a limiting block for performing fiber treatment on the valve membrane is integrally formed below the inner wall of the transverse pipe part of the input pipe. According to the utility model, the conductive electrode structure is arranged, so that the electric connection strength of the upper electrode and the lower electrode can be effectively ensured, and the circuit break phenomenon caused by repeated deformation is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to micro pressure electric jet field, concretely is a novel micro drop jet forming device. BACKGROUND

[0002] In sand core printing, first through the sand layer mixed with solidifying agent is laid, then through the resin is jetted, and the resin will produce solidification reaction after contacting with the solidifying agent, and through layer by layer accumulation, the 3D printing effect is realized.

[0003] And the resin is generally jetted by micro pressure electric jet device, the device utilizes the piezoelectric effect of piezoelectric ceramic, realizes that the diaphragm extrudes the resin in the nozzle, and forms the resin micro drop jet under the extrusion, but in the prior art, the electrode (generally formed by silver glue printing) above and below the piezoelectric ceramic is easy to appear connection open circuit in the deformation process of piezoelectric ceramic, so that the device cannot normally operate. UTILITY MODEL CONTENT

[0004] The utility model discloses a novel micro drop jet forming device.

[0005] To achieve the above object, the utility model provides the following technical scheme: a novel micro drop jet forming device, including the nozzle, the top of the nozzle is integrally formed with the connector, the inner wall both ends of the connector are provided with the recess that is concave downward, the top opening of the connector is installed piezoelectric electrode structure, the inner wall of the recess is installed with the conductive electrode structure that is connected with piezoelectric electrode structure;

[0006] The outer periphery of the nozzle one side is integrally formed with the input pipe, the horizontal pipe portion inner wall of the input pipe is connected with the valve film above, the outer periphery of the valve film is fixedly connected with the inner wall of the input pipe above, the outer periphery of the valve film is attached with the inner wall of the input pipe at other positions, and the horizontal pipe portion inner wall of the input pipe is integrally formed with the limiting block that the valve film is fibred below.

[0007] As a further scheme of the utility model: the piezoelectric electrode structure includes the piezoelectric ceramic arranged at the opening position of the connector, the top of the piezoelectric ceramic is coated with the upper electrode, the bottom of the piezoelectric ceramic is coated with the lower electrode, the bottom of the lower electrode is fixedly installed with the vibration diaphragm through the resin adhesive layer, and the vibration diaphragm is fixedly connected with the contact position of the connector through the resin adhesive layer.

[0008] As a further embodiment of this utility model: the conductive electrode structure includes conductive abutment plates respectively connected to the lower electrode and the upper electrode, the top ends of the two conductive abutment plates abutting against elastic conductive sheets, the top ends of the two elastic conductive sheets being fixedly connected to a fixing plate, the fixing plate being fixedly connected to the inner side of the groove, and the two conductive abutment plates being located at both ends of the piezoelectric ceramic.

[0009] As a further embodiment of this utility model: both ends of the piezoelectric ceramic are provided with mating grooves, and the inner wall of the mating groove is fitted with a mating block. The cross-section of the mating block and the mating groove are both in a convex shape with a 90-degree inclination. One end of the mating block is fixedly connected to the conductive abutment plate.

[0010] As a further improvement of this utility model, the vertical cross-section of the elastic conductive sheet is a V-shaped structure tilted at ninety degrees.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. By setting a conductive electrode structure, the electrical connection strength between the upper and lower electrodes can be effectively guaranteed, avoiding the open circuit phenomenon caused by multiple deformations. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0015] Figure 3 For the present utility model Figure 2 Enlarged view of a portion of point A in the middle;

[0016] Figure 4 For the present utility model Figure 2 Enlarged view of section B in the middle.

[0017] In the diagram: 1. Nozzle; 2. Connector; 3. Input pipe; 4. Groove; 5. Valve diaphragm; 6. Limiting block; 7. Piezoelectric ceramic; 8. Upper electrode; 9. Lower electrode; 10. Connecting block; 11. Conductive abutment plate; 12. Elastic conductive sheet; 13. Fixing plate; 14. Vibration diaphragm. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-4 In this embodiment of the present invention, a novel microdroplet jetting forming device includes a nozzle 1, a connector 2 integrally formed at the top of the nozzle 1, and recessed grooves 4 at both ends of the inner wall of the connector 2. A piezoelectric electrode is installed at the top opening of the connector 2, and a conductive electrode connected to the piezoelectric electrode is installed on the inner wall of the groove 4. An input tube 3 is integrally formed on one side of the outer periphery of the nozzle 1. A valve diaphragm 5 is connected to the upper part of the inner wall of the horizontal tube of the input tube 3. The upper part of the outer periphery of the valve diaphragm 5 is fixedly connected to the inner wall of the input tube 3, and the other parts of the outer periphery of the valve diaphragm 5 are in contact with the inner wall of the input tube 3. A fiber-limiting block 6 is integrally formed on the lower part of the inner wall of the horizontal tube of the input tube 3 to limit the fibers of the valve diaphragm 5.

[0020] In this embodiment: During sand mold printing, 3D printing of sand mold is achieved by laying sand layer by layer on the printing platform. During the printing process, resin is ejected from nozzle 1. Specifically, after the current is connected to the piezoelectric electrode and the conductive electrode, the piezoelectric electrode deforms and squeezes the resin in nozzle 1. The squeezed resin is output from nozzle 1, forming resin microdroplets that are ejected. The size of the ejected droplets depends on the degree of deformation of the piezoelectric electrode caused by the magnitude of the current. After the power is turned off, the piezoelectric electrode resets. The negative pressure generated at this time acts on the inner wall of the input pipe 3. At this time, the resin on the inner wall of the input pipe 3 enters the nozzle 1 to replenish it.

[0021] The design of the valve diaphragm 5 in conjunction with the limiting block 6 ensures that the resin can only enter the nozzle 1 from the input pipe 3, without the resin in the nozzle 1 entering the input pipe 3.

[0022] Please refer to this carefully. Figure 3 and Figure 4 The piezoelectric electrode structure includes a piezoelectric ceramic 7 disposed at the opening of the connector 2. The top of the piezoelectric ceramic 7 is coated with an upper electrode 8, and the bottom of the piezoelectric ceramic 7 is coated with a lower electrode 9. A vibration diaphragm 14 is fixedly installed at the bottom of the lower electrode 9 through a resin adhesive layer. The vibration diaphragm 14 is fixedly connected to the connector 2 at the contact position through a resin adhesive layer.

[0023] In this embodiment: after the current is applied to the conductive electrode, the piezoelectric ceramic 7 deforms due to its piezoelectric effect. The upper electrode 8 and lower electrode 9 (both of which are printed with silver paste) coated on the piezoelectric ceramic 7 also deform accordingly, and squeeze the vibrating diaphragm 14. The vibrating diaphragm 14 deforms accordingly and squeezes the resin in the nozzle 1, so that the resin microdroplets are ejected from the nozzle 1 under the squeezing force.

[0024] Please refer to this carefully. Figure 3 and Figure 4 The conductive electrode structure includes conductive abutment plates 11 connected to the lower electrode 9 and the upper electrode 8 respectively. The top ends of the two conductive abutment plates 11 are abutted against elastic conductive sheets 12. The top ends of the two elastic conductive sheets 12 are fixedly connected to fixing plates 13. The fixing plates 13 are fixedly connected to the inner side of the groove 4. The two conductive abutment plates 11 are located at both ends of the piezoelectric ceramic 7.

[0025] In this embodiment, the elastic conductive sheet 12 is electrically connected to the power supply through a wire. When the circuit is closed, the piezoelectric ceramic 7 deforms, and its two ends change from a horizontal state to an upward bent and raised state. At this time, the conductive abutment plate 11 moves accordingly and squeezes the elastic conductive sheet 12. The elastic conductive sheet 12 deforms under the squeeze. This design can effectively ensure the strength of the electrical connection position of the upper electrode 8 and the lower electrode 9, thereby avoiding the problem of circuit disconnection caused by deformation.

[0026] Please refer to this carefully. Figure 3 and Figure 4 Both ends of the piezoelectric ceramic 7 are provided with docking grooves, and docking blocks 10 are snapped into the inner wall of the docking grooves. The cross sections of the docking blocks 10 and the docking grooves are both inclined at ninety degrees and have a "convex" structure. One end of the docking block 10 is fixedly connected to the conductive abutment plate 11.

[0027] In this embodiment, the design of the docking block 10 and the docking groove can increase the contact area between the conductive abutment plate 11 and the piezoelectric ceramic 7, thereby ensuring that the conductive abutment plate 11 is deformed with the piezoelectric ceramic 7, thus ensuring that the two conductive abutment plates 11 are always in contact with the upper electrode 8 and the lower electrode 9.

[0028] Please refer to this carefully. Figure 3 and Figure 4 The vertical cross-section of the elastic conductive sheet 12 is a V-shaped structure tilted at ninety degrees.

[0029] In this embodiment, the design of the elastic conductive sheet 12 ensures that the elastic conductive sheet 12 and the conductive contact plate 11 maintain effective contact.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel microdroplet jetting forming device, comprising a nozzle (1), wherein a connector (2) is integrally formed at the top end of the nozzle (1), characterized in that, The inner wall of the connector (2) has downward recessed grooves (4) at both ends. The top opening of the connector (2) is equipped with a piezoelectric electrode structure, and the inner wall of the groove (4) is equipped with a conductive electrode structure connected to the piezoelectric electrode structure. The nozzle (1) has an input tube (3) integrally formed on one side of its outer periphery. A valve diaphragm (5) is connected to the upper part of the inner wall of the horizontal tube of the input tube (3). The upper part of the outer periphery of the valve diaphragm (5) is fixedly connected to the inner wall of the input tube (3). Other parts of the outer periphery of the valve diaphragm (5) are in contact with the inner wall of the input tube (3). A limiting block (6) for fiber placement of the valve diaphragm (5) is integrally formed on the lower part of the inner wall of the horizontal tube of the input tube (3).

2. The novel microdroplet jetting forming device according to claim 1, characterized in that, The piezoelectric electrode structure includes a piezoelectric ceramic (7) disposed at the opening of the connector (2). The top of the piezoelectric ceramic (7) is coated with an upper electrode (8), and the bottom of the piezoelectric ceramic (7) is coated with a lower electrode (9). A vibration diaphragm (14) is fixedly installed at the bottom of the lower electrode (9) through a resin adhesive layer. The vibration diaphragm (14) is fixedly connected to the connector (2) at the contact position through a resin adhesive layer.

3. The novel microdroplet jetting forming device according to claim 2, characterized in that, The conductive electrode structure includes conductive abutment plates (11) connected to the lower electrode (9) and the upper electrode (8) respectively. The top ends of the two conductive abutment plates (11) are abutted by elastic conductive sheets (12). The top ends of the two elastic conductive sheets (12) are fixedly connected to fixing plates (13). The fixing plates (13) are fixedly connected to the inner side of the groove (4). The two conductive abutment plates (11) are located at both ends of the piezoelectric ceramic (7).

4. The novel microdroplet jetting forming device according to claim 3, characterized in that, Both ends of the piezoelectric ceramic (7) are provided with docking grooves, and docking blocks (10) are snapped into the inner wall of the docking grooves. The cross sections of the docking blocks (10) and the docking grooves are both in a convex shape with a 90-degree inclination. One end of the docking block (10) is fixedly connected to the conductive abutment plate (11).

5. A novel microdroplet jetting forming device according to claim 4, characterized in that, The vertical cross-section of the elastic conductive sheet (12) is a V-shaped structure tilted at ninety degrees.

Images