Plunger type injection valve and spraying equipment

Abstract

The utility model is applicable to the technical field of spraying, and provides a plunger type injection valve and spraying equipment, the plunger type injection valve comprises an injection nozzle, a movable plunger, a plunger driving structure and a glue supply assembly, and the spraying equipment comprises any one of the plunger type injection valves. And during working, solid-liquid mixed glue liquid can be continuously input into the plunger cavity through the glue supply assembly. At least part of the movable plunger is movably arranged in the plunger cavity, and the movable plunger can move at a high speed under the action of the plunger driving structure, so that the volume in the plunger cavity is reduced, and high pressure is quickly generated, so that the aim of extruding a glue solution in the plunger cavity is fulfilled, the glue solution can generate kinetic energy which is large enough, and the glue solution is sprayed out from the glue outlet nozzle; and the end head of the movable plunger does not need to be in contact with the bottom of the plunger cavity in the glue solution spraying process. And on the premise that characters of the solid-liquid mixed glue solution are not damaged, spraying operation of the solid-liquid mixed glue solution can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to spraying technical field especially relates to a plunger type injection valve and spraying equipment. BACKGROUND

[0002] The injection valve is a device for spraying glue, which is used for injection coating of paint, silica gel, UV glue and other low viscosity glue, and is widely used in the fields of machine manufacturing, semiconductor, PCB (printed circuit board) manufacturing and SMT (surface mount technology) manufacturing, such as mobile phone shell appearance spraying, flux spraying and surface coating. In some specific process requirements, it is necessary to spray solid-liquid mixed solution to the product, but the existing injection valve has the problem of difficulty in spraying solid-liquid mixed solution, resulting in low spraying efficiency. SUMMARY

[0003] The utility model discloses a plunger type injection valve and spraying equipment, which aims to solve the technical problem of difficulty in spraying solid-liquid mixed solution in the prior art.

[0004] The utility model discloses a plunger type injection valve, which comprises a spraying nozzle, a movable plunger, a plunger driving structure and a glue supply assembly. The spraying nozzle has a plunger cavity and a glue outlet on it. The outlet of the glue supply assembly is connected with the plunger cavity and is used to input glue into the plunger cavity. The glue outlet is used to communicate the plunger cavity with the outside. At least part of the movable plunger is movably arranged in the plunger cavity. The movable plunger is used to extrude the glue in the plunger cavity so that the glue is sprayed out of the glue outlet. The plunger driving structure is connected with the movable plunger and is used to drive the movement of the movable plunger.

[0005] In an optional embodiment, the plunger driving structure comprises a piezoelectric component. The first end of the piezoelectric component is fixedly arranged. The second end of the piezoelectric component is connected with the part of the movable plunger outside the plunger cavity. The piezoelectric component is used to change the overall length of the piezoelectric component by changing the voltage applied to itself, so as to drive the movement of the movable plunger.

[0006] In an optional embodiment, the piezoelectric component drives the movable plunger to move in a first direction. The first direction is the movement direction of the movable plunger when the glue outlet sprays glue. An elastic return member is arranged between the spraying nozzle and the movable plunger. The elastic return member is used to apply a force to the movable plunger in the opposite direction of the first direction.

[0007] In an alternative embodiment, the movable plunger is further provided with a glue supply channel for supplying glue to the plunger cavity, the glue supply channel having a first end in communication with the outlet of the glue supply assembly and a second end in communication with the plunger cavity.

[0008] In an alternative embodiment, the movable plunger is spaced apart from the glue supply assembly, the piezoelectric assembly having a first end abutting the glue supply assembly and a second end connected to the portion of the movable plunger outside the plunger cavity, the glue supply channel being in communication with the glue supply assembly through a connecting pipe, the piezoelectric assembly being provided with an accommodating channel for accommodating the connecting pipe.

[0009] In an alternative embodiment, the plunger-type jet valve further comprises a waste glue container and a cover member, the cover member being arranged to cover the glue outlet, the cover member being provided with a clearance opening matching the position of the glue outlet, the cover member and the jet nozzle surrounding a cleaning cavity, the waste glue container being in communication with the cleaning cavity, the waste glue container being further configured to be in communication with a vacuum generating unit to suck the residual glue at the glue outlet into the waste glue container by negative pressure.

[0010] In an alternative embodiment, the jet nozzle has a glue outlet end face, the glue outlet being arranged on the glue outlet end face, the glue outlet end face is further provided with an annular groove, the annular groove is arranged around the glue outlet, the cover member is arranged to cover the opening of the annular groove, and at least part of the inner side surface of the cover member is spaced apart from the glue outlet end face.

[0011] In an alternative embodiment, the glue supply assembly comprises a glue supply body, a drive screw and a flexible portion, the glue supply body is provided with a drive channel, the glue supply body is further provided with a glue inlet and a glue outlet, the glue inlet and the glue outlet are in communication with the drive channel, the drive screw is rotatably arranged in the drive channel to drive the glue in the drive channel, and the flexible portion abuts the inner wall of the drive channel.

[0012] In an alternative embodiment, the glue supply body is further provided with a mounting opening for inserting the drive screw into the drive channel, the mounting opening is further provided with a mounting member, the drive screw penetrates through the mounting member and is rotatably connected to the mounting member.

[0013] In a second aspect, a spraying device is provided, comprising the plunger-type jet valve as described in any one of the preceding embodiments.

[0014] The technical effect of the utility model compared with prior art is: through setting plunger cavity and glue outlet on the injection nozzle, and connecting the outlet of glue supply assembly with the plunger cavity, the solid-liquid mixed glue liquid can be continuously input into the plunger cavity through the glue supply assembly during work. At least part of the movable plunger is movably arranged in the plunger cavity, and the movable plunger can move at high speed under the action of the plunger driving structure, so that the volume of the plunger cavity becomes smaller and high pressure is generated rapidly, thereby realizing the purpose of extruding the glue liquid in the plunger cavity, so that the glue liquid can generate enough kinetic energy to overcome the adhesive resistance of the glue liquid, and the glue liquid is sprayed from the glue outlet, and the end of the movable plunger does not need to be in contact with the bottom of the plunger cavity during the glue liquid spraying process. Compared with the injection valve in the prior art, the solid-liquid mixed glue liquid can be sprayed without damaging the properties of the solid-liquid mixed glue liquid, so that the spraying of the solid-liquid mixed glue liquid is simpler.

[0015] It can be understood that the beneficial effects of the second aspect described above can be referred to the related description in the first aspect described above, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiments of the utility model or the prior art description, obviously, the following described drawings are only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, other drawings can also be obtained according to these drawings.

[0017] Figure 1 It is the structure schematic diagram of plunger type injection valve provided by the embodiments of the utility model;

[0018] Figure 2 It is Figure 1 the enlarged structure schematic diagram of A in

[0019] Figure 3 It is Figure 1 the enlarged structure schematic diagram of B in

[0020] Marked with the drawing:

[0021] 1, injection nozzle;11, plunger cavity;12, glue outlet;13, shell part;14, plug cavity part;15, annular groove;2, movable plunger;21, glue supply channel;22, protruding part;3, plunger driving structure;31, piezoelectric component;32, containing channel;33, elastic reset piece;4, glue supply assembly;41, glue supply main body;42, drive screw;43, flexible part;44, mounting piece;45, drive channel;5, connecting pipe;6, waste glue container;7, cover piece;71, avoiding mouth;8, cleaning cavity. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary, and are intended to explain the present application, and are not understood as limiting the present application.

[0023] In the description of the present application, it is understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0025] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The working valve in the prior art includes a needle injection valve, a pneumatic dispensing valve and a screw injection valve. The working principle of the needle injection valve is that high pressure generated when the needle directly impacts the nozzle sprays the solution. However, when spraying a solid-liquid mixed solution, the impact between the needle and the nozzle can make some solid particles in the solution collapse and deform, thereby changing the solid-liquid properties and making the spraying effect unsatisfactory. The impact between the needle and the nozzle can cause serious wear of the nozzle, greatly reducing the service life of the parts, increasing the use cost and maintenance difficulty. The general pneumatic dispensing valve can only be contact type and cannot spray glue solution, resulting in low working efficiency of the pneumatic dispensing valve. Moreover, due to the influence of liquid resistance, the glue supply resistance will change with the change of the needle cylinder liquid level, resulting in the need for closed-loop control of the air pressure according to the liquid level change. However, this process is affected by many factors such as liquid viscosity and needle cylinder size, making it difficult to control the amount of sprayed glue. In addition to the low efficiency of the contact dispensing of the screw injection valve, the screw injection valve cannot be used for solid-liquid mixed solutions. Since there is a large range of relative movement between the screw and the rigid stator, when used for some solutions mixed with fine solid particles, particles can enter the gap between the screw and the stator, causing the particles to be crushed by friction. This continuous accumulation can eventually easily form a blockage and prevent glue from being dispensed, thereby causing the problem of difficulty in spraying solid-liquid mixed solutions. In order to solve the above technical problems, the application provides a plunger injection valve and a spraying device, and the specific working principle is as follows:

[0027] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model is further described in detail below with reference to the drawings and examples.

[0028] Please refer to Figures 1 to 3 In the embodiment of the utility model, a plunger injection valve is provided, which comprises a spraying nozzle 1, a movable plunger 2, a plunger driving structure 3 and a glue supply assembly 4. The spraying nozzle 1 has a plunger cavity 11 and a glue outlet 12. The outlet of the glue supply assembly 4 is connected to the plunger cavity 11 and used for inputting glue solution into the plunger cavity 11. The glue outlet 12 is used for connecting the plunger cavity 11 to the outside. At least part of the movable plunger 2 is movably arranged in the plunger cavity 11. The movable plunger 2 is used for extruding the glue solution in the plunger cavity 11 to spray the glue solution from the glue outlet 12. The plunger driving structure 3 is connected to the movable plunger 2 and used for driving the movable plunger 2 to move.

[0029] Specifically, the injection nozzle 1 refers to a component with a certain volume, and the injection nozzle 1 can be columnar, block-shaped or a combination of various shapes. The plunger cavity 11 refers to a cavity structure with a certain volume arranged on the injection nozzle 1, and the plunger cavity 11 can be columnar with a certain height, and the cross section can be circular or other shapes. The plunger cavity 11 usually has a mounting opening allowing at least part of the movable plunger 2 to be inserted into the plunger cavity 11. The glue outlet 12 refers to an opening structure arranged on the injection nozzle 1 and communicating with the plunger cavity 11. When the glue pressure in the plunger cavity 11 increases, the glue can be injected from the glue outlet 12.

[0030] The movable plunger 2 refers to a component with a certain length, and the movable plunger 2 is generally columnar, and the cross-sectional shape of the movable plunger 2 is adapted to the cross-sectional shape of the plunger cavity 11. The movable plunger 2 is generally coaxially arranged with the plunger cavity 11 and can reciprocate along the axis of the plunger cavity 11 under the action of an external force. The plunger driving structure 3 refers to a component or assembly that can drive a body to move in a straight line. The plunger driving structure 3 can be a pneumatic cylinder, a hydraulic cylinder or an electric push rod, etc. The plunger driving structure 3 can also be a piezoelectric assembly 31. The glue supply assembly 4 refers to a component or assembly that can continuously input glue into a specified area or cavity. The outlet of the glue supply assembly 4 can be directly communicated with the plunger cavity 11 on the injection nozzle 1, or can be communicated with the plunger cavity 11 through a connecting pipe 5 or the like.

[0031] The plunger type injection valve provided by the embodiment of the utility model, through setting the plunger cavity 11 and the glue outlet 12 on the injection nozzle 1, and connecting the outlet of the glue supply assembly 4 with the plunger cavity 11, the glue supply assembly 4 can continuously input the solid-liquid mixed glue into the plunger cavity 11 during work. At the same time, at least part of the movable plunger 2 is movably arranged in the plunger cavity 11, and the movable plunger 2 can move at high speed under the action of the plunger driving structure 3, so that the volume of the plunger cavity 11 decreases rapidly to generate high pressure, thereby realizing the purpose of extruding the glue in the plunger cavity 11, so that the glue can generate enough kinetic energy to overcome the viscous resistance of the glue itself, and the glue can be injected from the glue outlet 12. In the process of glue injection, the end of the movable plunger 2 does not need to be in contact with the bottom of the plunger cavity 11. Compared with the injection valve in the prior art, the solid-liquid mixed glue can be injected without damaging the properties of the solid-liquid mixed glue, so that the injection of the solid-liquid mixed glue is simpler.

[0032] In an optional embodiment, please refer to Figure 1, the injection nozzle 1 can include a shell part 13 and a plunger cavity part 14, wherein the plunger cavity 11 is arranged on the plunger cavity part 14. The shell part 13 and the plunger cavity part 14 can be an integral structure, or can be a split structure. When the shell part 13 and the plunger cavity part 14 are a split structure, a mounting structure, such as a mounting channel or a mounting hole, can be arranged on the shell part 13 for mounting the injection nozzle 1, and the plunger cavity part 14 is arranged in the mounting channel. The movable plunger 2 and the plunger driving structure 3 can be arranged inside the shell part 13. The shell part 13 can be a cylindrical structure, the mounting channel is arranged at one end of the shell part 13, and the other end of the shell part 13 can be connected to the outside of the glue supply assembly 4. The shell part 13 supports the plunger cavity part 14, making the plunger cavity part 14 more secure and convenient to install, and also protecting the plunger driving structure 3 and the movable plunger 2.

[0033] In one embodiment, referring to Figure 1 The plunger driving structure 3 includes a piezoelectric assembly 31, a first end of the piezoelectric assembly 31 is fixedly arranged, a second end of the piezoelectric assembly 31 is connected to a part of the movable plunger 2 outside the plunger cavity 11, and the piezoelectric assembly 31 is used to change the overall length of the piezoelectric assembly 31 by changing the voltage applied to itself to drive the movable plunger 2 to move. Specifically, the piezoelectric assembly 31 refers to a device that converts electrical energy and mechanical energy by using the piezoelectric effect and inverse piezoelectric effect of piezoelectric materials. Piezoelectric materials refer to materials that can generate voltage under external force or produce mechanical strain by applying voltage. The piezoelectric assembly 31 can be composed of multiple piezoelectric components made of piezoelectric materials. By stacking multiple piezoelectric components to form the piezoelectric assembly 31, the deformation of the piezoelectric components can be accumulated, allowing the piezoelectric assembly 31 to have a larger deformation range. By fixing the first end of the piezoelectric assembly 31 and connecting the second end of the piezoelectric assembly 31 to the part of the movable plunger 2 outside the plunger cavity 11, when the voltage applied to the piezoelectric assembly 31 changes at a high frequency, the overall height of the piezoelectric assembly 31 will change. At this time, since the first end of the piezoelectric assembly 31 is fixedly arranged, the second end of the piezoelectric assembly 31 will drive the movable plunger 2 to move at a high speed, thereby achieving the purpose of driving the movable plunger 2 to move at a high speed. By using the piezoelectric assembly 31 to drive the movable plunger 2 to move, the speed of the movable plunger 2 can be faster, thereby generating greater pressure on the glue liquid in the plunger cavity 11, allowing the glue liquid to be sprayed farther, and improving the spraying effect.

[0034] In one embodiment, referring to Figure 1, the piezoelectric component 31 drives the movable plunger 2 to move in the first direction, the first direction being the movement direction of the movable plunger 2 when the glue liquid is sprayed out of the glue spraying nozzle 12, and the elastic reset member 33 is arranged between the spraying nozzle 1 and the movable plunger 2, and is used to apply a force to the movable plunger 2 in the direction opposite to the first direction. Specifically, the elastic reset member 33 refers to a component that can be elastically deformed. By arranging the elastic reset member 33 between the spraying nozzle 1 and the movable plunger 2, the elastic reset member 33 can be deformed when the piezoelectric component 31 drives the movable plunger 2 to move in the first direction, and can apply a force to the movable plunger 2 in the direction opposite to the first direction when the deformation of the piezoelectric component 31 is restored, so that the movable plunger 2 is quickly reset, the volume of the plunger cavity 11 is quickly increased to generate negative pressure, and the sprayed glue line is quickly broken to form glue drops under the action of the negative pressure, so that the amount of glue liquid sprayed out of the glue spraying nozzle 12 is more convenient and accurate to control.

[0035] In an optional embodiment, referring to Figure 1 , the elastic reset member 33 includes a spring washer, the spring washer is sleeved on the outside of the movable plunger 2, and a protruding portion 22 protruding in the radial direction of the movable plunger 2 is further arranged at the end of the movable plunger 2, the elastic reset member 33 is located between the protruding portion 22 and the spraying nozzle 1, the spring washer can be compressed when the piezoelectric component 31 drives the movable plunger 2 to move in the first direction, and the movable plunger 2 can be quickly reset by the spring washer after the spraying is completed. The elastic reset uses the spring washer, which can save the volume occupied by the installation, and at the same time, the elastic reset member 33 can provide greater elastic force and have a longer service life.

[0036] In an embodiment, referring to Figure 1 and Figure 2 , the movable plunger 2 is further provided with a glue supply channel 21, the glue supply channel 21 is used to supply the glue liquid to enter the plunger cavity 11, a first end of the glue supply channel 21 is in communication with the outlet of the glue supply component 4, and a second end of the glue supply channel 21 is in communication with the plunger cavity 11. Specifically, the glue supply channel 21 refers to a channel structure with a certain length, and the glue supply channel 21 usually has two end outlets, wherein the first end of the glue supply channel 21 is in communication with the outlet of the glue supply component 4, and the second end of the glue supply channel 21 is in communication with the plunger cavity 11. The glue liquid in the glue supply component 4 can enter the plunger cavity 11 through the glue supply channel 21, thereby avoiding opening an additional opening on the spraying nozzle 1 to connect the plunger cavity 11 with the outlet of the glue supply component 4, making the structure of the entire spraying nozzle 1 simpler, and increasing the sealing performance of the plunger cavity 11.

[0037] In an optional embodiment, referring to Figure 1 and Figure 2The glue supply channel 21 is arranged in parallel with the axis of the movable plunger 2, and the glue supply channel 21 is arranged through the movable plunger 2. The path of the glue liquid through the glue supply channel 21 into the plunger cavity 11 is the shortest, and the speed of the glue liquid input is improved.

[0038] In one embodiment, referring to Figure 1 The movable plunger 2 is arranged apart from the glue supply assembly 4, the first end of the piezoelectric assembly 31 abuts the glue supply assembly 4, the second end is connected to the part of the movable plunger 2 outside the plunger cavity 11, the glue supply channel 21 is communicated with the glue supply assembly 4 through the connecting pipe 5, and the piezoelectric assembly 31 is provided with a containing channel 32 for containing the connecting pipe 5. Specifically, the connecting pipe 5 refers to a pipe structure with a certain length, and the connecting pipe 5 is connected between the outlet of the glue supply assembly 4 and the glue supply channel 21 on the movable plunger 2. The connecting pipe 5 can be a flexible hose, and the connecting pipe 5 can also be a rigid pipe, and one end of the connecting pipe 5 is fixedly connected with the glue supply channel 21 on the movable plunger 2, and the other end of the connecting pipe 5 can be movably connected with the glue supply assembly 4, so that the connection can be maintained during the movement of the movable plunger 2 relative to the glue supply assembly 4. The containing channel 32 refers to a channel structure with a certain length, and the containing channel 32 can be arranged through the piezoelectric assembly 31 along the axis direction of the piezoelectric assembly 31, so that the connecting pipe 5 can pass through the piezoelectric assembly 31.

[0039] The injection nozzle 1 can be arranged apart from the glue supply assembly 4 by the support of the shell part 13, and the movable plunger 2 is movably arranged in the plunger cavity 11 on the injection nozzle 1, so that the movable plunger 2 can also be arranged apart from the glue supply assembly 4. By arranging the piezoelectric assembly 31 between the movable plunger 2 and the glue supply assembly 4, the first end of the piezoelectric assembly 31 is abutted to the glue supply assembly 4, so that the first end of the piezoelectric assembly 31 can be fixedly arranged, the second end of the piezoelectric assembly 31 is connected to the part of the movable plunger 2 outside the plunger cavity 11, and the movable plunger 2 can be driven to move when the overall size of the piezoelectric assembly 31 changes, so as to realize the purpose of driving the movable plunger 2 to move at high speed by the piezoelectric assembly 31, and the internal structure of the plunger type injection valve is more simple and reasonable. At the same time, the containing channel 32 is arranged on the piezoelectric assembly 31 to contain the connecting pipe 5, so as to save the space occupied by the connecting pipe 5.

[0040] In one embodiment, referring to Figure 1 and Figure 2The plunger injection valve further comprises a waste glue container 6 and a cover 7, the cover 7 is arranged at the glue outlet 12, the cover 7 is provided with a bypass opening 71 matched with the position of the glue outlet 12, the cover 7 and the injection nozzle 1 form a cleaning cavity 8, the waste glue container 6 is communicated with the cleaning cavity 8, and the waste glue container 6 is also used for being communicated with a vacuum generating unit to suck the residual glue liquid at the glue outlet 12 into the waste glue container 6 through negative pressure.

[0041] Specifically, the cover 7 refers to a component with a certain area, and the cover 7 can be block-shaped, plate-shaped or combined in various shapes. The cover 7 can refer to a separate component connected to the injection nozzle 1 by clamping, threaded connection, pasting or welding, etc., to achieve the purpose of covering the glue outlet 12. The cover 7 can also refer to a part of the injection nozzle 1, that is, the cover 7 and the injection nozzle 1 are an integral structure, for example, integrally formed by casting or 3D printing. The cleaning cavity 8 refers to a cavity structure with a certain volume, which can be formed by the cover 7 and the injection nozzle 1. The bypass opening 71 refers to an opening structure with a certain area. The waste glue container 6 refers to a component with a certain containing space, which can be fixed outside the injection nozzle 1 or the shell part 13, and can also be placed separately. The waste glue container 6 can be communicated with the cleaning cavity 8 through the channel provided on the injection nozzle 1, and can also be communicated with the cleaning cavity 8 through the pipeline.

[0042] By covering the glue outlet 12 with the cover 7, and providing the bypass opening 71 on the cover 7 matched with the position of the glue outlet 12, the glue liquid can be sprayed through the bypass opening 71 during glue spraying, avoiding the blockage of the cover 7 to the glue spraying. And the cover 7 and the injection nozzle 1 form a cleaning cavity 8, the waste glue container 6 is communicated with the cleaning cavity 8 and the vacuum generating unit at the same time, and the negative pressure can be generated in the waste glue container 6 through the vacuum generating unit after the glue spraying of the injection nozzle 1, so that the residual glue liquid in the cleaning cavity 8 at the glue outlet 12 can be sucked into the waste glue container 6, to achieve the purpose of nozzle cleaning, avoid stopping to wipe and improve the efficiency of injection, at the same time, reduce the satellite drop caused by glue scattering, so as to improve the quality and quality of the product.

[0043] In one embodiment, please refer to Figure 1 and Figure 2The glue outlet face is provided on the injection nozzle 1, the glue outlet nozzle 12 is arranged on the glue outlet face, the annular groove 15 is concavely arranged on the glue outlet face, the annular groove 15 is arranged around the glue outlet nozzle 12, the cover member 7 is arranged on the opening of the annular groove 15, and at least part of the inner side face of the cover member 7 is arranged to be spaced apart from the glue outlet face. Specifically, the glue outlet face refers to a face structure with a certain area, the glue outlet face is arranged on the surface of the injection nozzle 1, and the glue outlet face can be a plane structure or a curved surface structure. The annular groove 15 refers to a groove structure arranged in a ring shape and having a certain depth. By arranging the glue outlet nozzle 12 on the glue outlet face, the annular groove 15 arranged around the glue outlet nozzle 12 is concavely arranged on the glue outlet face. The cover member 7 can be arranged on the opening of the annular groove 15, wherein the cover member 7 can be connected with the injection nozzle 1 by clamping, fastening, pasting or welding. At the same time, at least part of the inner side face of the cover member 7 is arranged to be spaced apart from the glue outlet face, so that the cover member 7 can be arranged with the injection nozzle 1 to form a cleaning cavity 8. In addition, a communication hole can be arranged on the side wall of the injection nozzle 1 to communicate the annular groove 15 with the waste glue container 6, so as to clean the residual glue on the glue outlet face. The overall structure of the injection nozzle 1 can be made more simple, and the processing of the injection nozzle 1 is more convenient.

[0044] In addition, it should be noted that the annular groove 15 is arranged around the glue outlet nozzle 12, and when the residual glue on the glue outlet nozzle 12 is cleaned by the vacuum generating unit, a radial airflow centered on the glue outlet nozzle 12 is generated, so that the cleaning effect of the residual glue on the glue outlet nozzle 12 is better, and the efficiency of waste glue cleaning is improved.

[0045] In one embodiment, please refer to Figure 1 and Figure 3The glue supply assembly 4 comprises a glue supply body 41, a driving screw 42 and a flexible part 43. The glue supply body 41 is provided with a driving channel 45. The glue supply body 41 is also provided with a glue inlet and a glue outlet. The glue inlet and the glue outlet are communicated with the driving channel 45. The driving screw 42 is rotatably arranged in the driving channel 45 and used to drive the glue in the driving channel 45. The flexible part 43 abuts against the inner wall of the driving channel 45. Specifically, the glue supply body 41 refers to a component with a certain volume. The glue supply body 41 is usually block-shaped. The driving screw 42 refers to a rod-shaped component with a certain length and a thread arranged on the circumference. The flexible part 43 refers to a component or structure that can be deformed to a certain extent when subjected to an external force. By arranging the driving channel 45 on the glue supply body 41 and rotatably arranging the driving screw 42 in the driving channel 45, the driving screw 42 can be connected with an external power unit. The flow of the glue in the driving channel 45 can be driven by the rotation of the driving screw 42. The glue can enter the driving channel 45 from the glue inlet and be discharged from the glue outlet. At the same time, the flexible part 43 abuts against the inner wall of the driving channel 45. During the transportation of the solid-liquid mixed glue, the flexible part 43 can be deformed to a certain extent when subjected to extrusion. The solid particles can be prevented from being stuck between the driving screw 42 and the inner wall of the driving channel 45 to block the driving channel 45. The arrangement of the flexible part 43 can also reduce the abrasion of the solid particles in the solid-liquid mixed glue to the side wall of the driving channel 45.

[0046] In addition, it should be noted that the rotation of the driving screw 42 can keep the input speed of the glue uniform. The rotation speed of the driving screw 42 can be controlled to adjust the delivery speed of the glue. The use of the glue supply assembly 4 is more convenient, and the quality of the glue spraying is improved.

[0047] In an optional embodiment, referring to Figure 3 The flexible part 43 comprises a flexible sleeve. The outer part of the flexible sleeve abuts against the inner wall of the driving channel 45. The driving screw 42 is rotatably arranged in the inner part of the flexible sleeve. The flexible part 43 in the form of the flexible sleeve can be more stable without affecting the transportation of the glue.

[0048] In an embodiment, referring to Figure 3The mounting opening is provided with a mounting piece 44, the driving screw 42 penetrates through the mounting piece 44 and is rotationally connected with the mounting piece 44. Specifically, the mounting piece 44 refers to a component with a certain volume, and the mounting piece 44 can be block-shaped, plate-shaped or columnar. By providing the mounting piece 44 at the mounting opening, the driving screw 42 can be supported, and the installation of the driving screw 42 is more stable. The flexible part 43 can also be limited, the position of the flexible part 43 is kept fixed, the flexible part 43 is prevented from being pulled out of the driving channel 45, and the overall structure of the glue supply assembly 4 is more stable.

[0049] In the second aspect, a spraying device for spraying a solid-liquid mixed solution is provided, and the spraying device comprises the plunger type jet valve according to any one of the above aspects. It can be understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, and will not be repeated here.

[0050] The above only describes the technical principles of the present application, and these descriptions are only for explaining the principles of the present application, and cannot be interpreted as limiting the protection scope of the present application in any way. Based on the above explanation, any modification, equivalent replacement and improvement within the spirit and principles of the present application, and other specific embodiments of the present application that can be conceived by those skilled in the art without creative labor, should be included in the protection scope of the present application.

Claims

1. A plunger-type injection valve, characterized in that, The device includes a nozzle, a movable plunger, a plunger drive structure, and a glue supply assembly. The nozzle has a plunger cavity and a glue outlet. The outlet of the glue supply assembly is connected to the plunger cavity and is used to input glue into the plunger cavity. The glue outlet is used to connect the plunger cavity to the outside. At least a portion of the movable plunger is movably disposed within the plunger cavity. The movable plunger is used to squeeze the glue in the plunger cavity so that the glue is sprayed out from the glue outlet. The plunger drive structure is connected to the movable plunger and is used to drive the movable plunger to move.

2. The plunger-type injection valve as described in claim 1, characterized in that, The plunger drive structure includes a piezoelectric component. The first end of the piezoelectric component is fixedly disposed, and the second end of the piezoelectric component is connected to the portion of the movable plunger located outside the plunger cavity. The piezoelectric component is used to change the overall length of the piezoelectric component by changing the voltage applied to itself, so as to drive the movable plunger to move.

3. The plunger-type injection valve as described in claim 2, characterized in that, The piezoelectric component drives the movable plunger to move along a first direction, which is the direction of movement of the movable plunger when the adhesive is sprayed from the nozzle. An elastic reset member is provided between the nozzle and the movable plunger, and the elastic reset member is used to apply a force to the movable plunger that is opposite to the first direction.

4. The plunger-type injection valve as described in claim 3, characterized in that, The movable plunger is also provided with a glue supply channel, which is used to supply glue liquid through and input it into the plunger cavity. The first end of the glue supply channel is connected to the outlet of the glue supply assembly, and the second end is connected to the plunger cavity.

5. The plunger-type injection valve as described in claim 4, characterized in that, The movable plunger is spaced apart from the glue supply assembly. The first end of the piezoelectric assembly abuts against the glue supply assembly, and the second end is connected to the portion of the movable plunger located outside the plunger cavity. The glue supply channel is connected to the glue supply assembly through a connecting pipe. The piezoelectric assembly is provided with a receiving channel for accommodating the connecting pipe.

6. The plunger-type injection valve as described in claim 1, characterized in that, The plunger-type injection valve also includes a waste glue container and a cap. The cap is placed over the glue outlet and has a clearance opening that matches the position of the glue outlet. The cap and the injection nozzle form a cleaning chamber. The waste glue container is connected to the cleaning chamber. The waste glue container is also connected to a vacuum generating unit to draw residual glue from the glue outlet into the waste glue container through negative pressure.

7. The plunger-type injection valve as described in claim 6, characterized in that, The nozzle has an adhesive dispensing end face, the adhesive dispensing nozzle is disposed on the adhesive dispensing end face, and an annular groove is also recessed on the adhesive dispensing end face. The annular groove surrounds the adhesive dispensing nozzle, and the capping member covers the opening of the annular groove. At least a portion of the inner side surface of the capping member is spaced apart from the adhesive dispensing end face.

8. The plunger-type injection valve according to any one of claims 1 to 7, characterized in that, The glue supply assembly includes a glue supply body, a drive screw, and a flexible part. The glue supply body has a drive channel and is also provided with a glue inlet and a glue outlet. The glue inlet and the glue outlet are respectively connected to the drive channel. The drive screw is rotatably inserted into the drive channel to drive the glue liquid in the drive channel to move. The flexible part abuts against the inner wall of the drive channel.

9. The plunger-type injection valve as described in claim 8, characterized in that, The glue supply body also has an installation opening for inserting the drive screw into the drive channel. An installation component is also provided at the installation opening, and the drive screw passes through the installation component and is rotatably connected to the installation component.

10. A spraying device, characterized in that, Including the plunger-type injection valve as described in any one of claims 1 to 9.

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