High precision dispensing device

Abstract

The invention discloses a high-precision glue dispensing device, comprising a jet glue dispensing valve and a lifting mechanism, wherein the jet glue dispensing valve is fixed on the lifting mechanism, the jet glue dispensing valve has a nozzle, one end of the nozzle from which glue is sprayed is provided with a temporary storage nozzle, a temporary storage chamber is provided in the temporary storage nozzle, and a glue outlet is provided at the bottom end of the temporary storage nozzle. The invention can not only realize the provision of a trace amount of glue at a time, but also avoid residue at the nozzle, and there is no need to stop the machine for wiping, thereby ensuring high-speed production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of glue dispensing valves, and more specifically relates to a high-precision glue dispensing device. Background Art

[0002] The dispensing valve currently used in dispensing machines is a precision device, which controls the opening and closing of the nozzle by driving the movement of the striker to control the glue discharge.

[0003] There are many types of dispensing valves, among which the jet dispensing valve uses the characteristics of piezoelectric materials to generate mechanical force through voltage. When the piezoelectric material below is charged, the valve opens; when the piezoelectric material above is charged, the valve closes. Because the space for opening and closing the valve is extremely small and the operating frequency is extremely high, a very small amount of liquid material can be sprayed out at high speed.

[0004] For example, the Chinese patent application number 2007101686691 discloses a high-viscosity fluid micro-injection dispensing device, wherein the upper end of the driving mechanism is connected to the stroke and pre-pressure adjustment mechanism, the lower end is connected to the injection mechanism, the side of the injection mechanism is connected to the feeding mechanism, and a valve stem and an injection head located at the lower end of the valve stem are arranged inside the injection mechanism, and the injection head includes a valve stem, a valve seat and a nozzle. During dispensing, the valve stem is separated from the valve seat under the action of the driving mechanism, and the fluid fills the gap formed by the valve stem leaving the valve seat under the action of the feeding pressure, and then the compressed air is released, and the fluid around the valve stem and in the valve seat flows to the nozzle at a certain speed under the action of the stroke and pre-pressure adjustment mechanism. Finally, when the valve stem and the valve seat are completely in contact and closed, the fluid stops flowing to the nozzle, and the fluid flowing out of the nozzle is separated from the fluid in the valve seat to form droplets with a certain speed.

[0005] However, when the existing jet dispensing valve is working, some glue will remain on its nozzle. If the residual glue is not wiped off in time, it will cause blockage and contamination of the dispensing nozzle, reduce the service life of the dispensing nozzle, and affect the dispensing quality. Therefore, when using this jet dispensing valve, it is usually necessary to wipe the nozzle frequently to remove the colloid involved.

[0006] For example, a Chinese patent application numbered 201820612323X discloses an automatic wiping device for dispensing nozzles and a dispensing machine. The automatic wiping device for dispensing nozzles includes a wiping platform, a feeding unit covered with a wiping cloth roll, a transmission unit, and a recovery unit; the transmission unit drives the recovery unit to recover the wiping cloth and can drive the wiping cloth to slide on the wiping platform, and the wiping cloth drives the feeding unit to rotate to realize the feeding function; when the wiping cloth slides on the wiping platform, the wiping cloth wipes the dispensing nozzle close to the wiping platform to realize automatic wiping; the automatic wiping device for dispensing nozzles can realize automatic wiping when the nozzle is close to the wiping platform.

[0007] Whether it is manual wiping or mechanical wiping, the dispensing action needs to be stopped, which is not conducive to high-speed and efficient production. Summary of the invention

[0008] In view of the deficiencies of the prior art, the present invention provides a device that can not only provide a trace amount of glue at a time, but also avoid residue at the nozzle, without stopping the machine for wiping, thereby ensuring high-speed production efficiency.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-precision glue dispensing device, comprising a jet dispensing valve and a lifting mechanism, the jet dispensing valve is fixed on the lifting mechanism, the jet dispensing valve has a nozzle, a temporary storage nozzle is provided at one end of the nozzle from which the glue is sprayed out, a temporary storage chamber is provided in the temporary storage nozzle, and a glue outlet is provided at the bottom end of the temporary storage nozzle.

[0010] Furthermore, the connection between the inner wall of the temporary storage chamber and the glue outlet is inclined to form a flow guide slope.

[0011] Furthermore, the temporary storage nozzle is detachably connected to the nozzle.

[0012] Furthermore, the main body of the nozzle jet dispensing valve is detachably connected.

[0013] The lifting mechanism further comprises a cylinder or a linear servo motor.

[0014] Further, the following dispensing method is also included:

[0015] S1: The lifting mechanism makes the jet dispensing valve rise, and the temporary storage nozzle is away from the product;

[0016] S2: The jet dispensing valve sprays glue from the nozzle into the temporary storage nozzle, and the glue is stored in the temporary storage chamber, and glue drops are formed at the glue outlet of the temporary storage nozzle;

[0017] S3: The lifting mechanism lowers the jet dispensing valve, and the glue drop on the temporary storage nozzle contacts the product. The lifting mechanism raises the jet dispensing valve, and all the glue in the temporary storage chamber is pulled out and adheres to the product.

[0018] Compared with the prior art, the beneficial effects of the present invention are: a jet dispensing valve is used to provide a trace amount of glue at a time, and the glue is allowed to enter the temporary storage chamber by setting a temporary storage nozzle to avoid direct spraying. The glue forms glue droplets, which are pulled out all at once after contacting the product, preventing residues caused by spraying, eliminating the wiping and cleaning process, and ensuring high production efficiency. Different temporary storage nozzles and / or nozzles can be replaced according to glues of different viscosities, so that the glue is in the temporary storage nozzle instead of being sprayed out at one time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of the high-precision glue dispensing device of the present invention;

[0020] Figure 2 It is a cross-sectional view of the nozzle and the temporary storage nozzle in the present invention (when the glue moves from the nozzle to the temporary storage nozzle);

[0021] Figure 3 It is a cross-sectional view of the nozzle and the temporary storage nozzle in the present invention (when the glue moves into the temporary storage nozzle).

[0022] Figure numerals: 1, jet dispensing valve; 11, nozzle; 116, injection channel; 2, lifting mechanism; 3, temporary storage nozzle; 31, temporary storage chamber; 32, glue outlet; 6, glue; 61, glue drop; 7, product. DETAILED DESCRIPTION

[0023] Reference Figures 1 to 3 The embodiment of the high-precision glue dispensing device of the present invention is further described.

[0024] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, "several" and "a number" mean two or more, unless otherwise clearly and specifically defined.

[0026] A high-precision glue dispensing device comprises a jet glue dispensing valve 1 and a lifting mechanism 2. The jet glue dispensing valve 1 is fixed on the lifting mechanism 2. The jet glue dispensing valve 1 has a nozzle 11. A temporary storage nozzle 3 is arranged at one end of the nozzle 11 from which glue 6 is sprayed out. A temporary storage chamber 31 is arranged in the temporary storage nozzle 3. A glue outlet 32 ​​is arranged at the bottom end of the temporary storage nozzle 3.

[0027] The structure and usage of the jet dispensing valve 1 in this embodiment are the same as those in the prior art, and the single glue spraying amount and the pressure of the jetting airflow can be adjusted as needed.

[0028] In this embodiment, the nozzle 11 has an injection channel 116, the bottom end of the injection channel 116 is connected to the temporary storage chamber 31, and the connection between the two is smoothly transitioned, or the opening size of the connection between the two is the same. Preferably, the size of the bottom end of the injection channel 116 is larger than the size of the top end. During the process of the glue 6 being sprayed out, it moves downward from the top end of the injection channel 116, the space of the area passed through is increased, the injection speed is reduced, and it is stored in the temporary storage chamber 31, and will not be directly sprayed out from the glue outlet 32 ​​of the temporary storage nozzle 3.

[0029] like Figure 2 and 3 As shown, in this embodiment, the caliber of the lower portion of the injection channel 116 gradually increases, so that its cross section is trapezoidal, and can also be a curved surface shape.

[0030] It also includes the following dispensing methods:

[0031] like Figure 2 As shown, placing glue 6 on the upper surface of product 7 is taken as an example.

[0032] S1: The lifting mechanism 2 makes the jet dispensing valve 1 rise, and the temporary storage nozzle 3 is away from the product 7;

[0033] S2: the jet dispensing valve 1 sprays the glue 6 from the nozzle 11 into the temporary storage nozzle 3, and the glue 6 is stored in the temporary storage chamber 31, and at the same time, a glue drop 61 is formed at the glue outlet 32 ​​of the temporary storage nozzle 3;

[0034] S3: the lifting mechanism 2 lowers the jet dispensing valve 1, the glue drop 61 on the temporary storage nozzle 3 contacts the product 7, and the lifting mechanism 2 raises the jet dispensing valve 1, and all the glue 6 in the temporary storage chamber 31 is pulled out and adheres to the product 7.

[0035] During the glue 6 spraying process, all the places where the glue 6 passes through are smooth surfaces, which can avoid the generation of residual glue 6 during the spraying process. In the process of being pulled out through the temporary storage nozzle 3, the glue 6 itself can use its viscosity to pull all the glue 6 in the temporary storage chamber 31 out at one time through the glue droplets 61, which also avoids the generation of residue. This not only ensures the accuracy of the glue 6, but also eliminates the need for frequent wiping and cleaning.

[0036] In this embodiment, the connection between the inner wall of the temporary storage chamber 31 and the glue outlet 32 ​​is preferably inclined to form a flow guiding slope.

[0037] like Figure 2 and 3 As shown, the side of the temporary storage chamber 31 in this embodiment is gradually inclined from top to bottom toward the glue outlet 32 ​​until it is connected to the top of the glue outlet 32, so that the side of the entire temporary storage chamber 31 is inclined, and the specific guide slope section can be straight or curved; through this structure, the glue 6 can smoothly leave the temporary storage chamber 31 at one time during the process of being pulled out.

[0038] In this embodiment, the temporary storage nozzle 3 is preferably detachably connected to the nozzle 11 .

[0039] The nozzle 11 may also be detachably connected to the main body of the jet dispensing valve 1 .

[0040] That is, according to the viscosity of different glue 6 or the amount of glue sprayed, different temporary storage nozzles 3 and / or nozzles 11 can be replaced to ensure that the glue 6 is sprayed into the temporary storage chamber 31 of the temporary storage nozzle 3 and forms glue droplets 61 at the glue outlet 32 ​​to avoid being sprayed out at one time.

[0041] The lifting mechanism 2 preferably in this embodiment includes a cylinder or a linear servo motor, through which the rising and falling of the jet dispensing valve 1 can be accurately and quickly controlled.

[0042] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A high-precision dispensing device, characterized in that: It includes a jet dispensing valve and a lifting mechanism, wherein the jet dispensing valve is fixed on the lifting mechanism, the jet dispensing valve has a nozzle, a temporary storage nozzle is arranged at one end of the nozzle where glue is sprayed out, a temporary storage chamber is arranged in the temporary storage nozzle, and a glue outlet is arranged at the bottom end of the temporary storage nozzle; The nozzle has an injection channel, the bottom end of the injection channel is connected to the temporary storage chamber, and the connection between the two is smoothly transitioned, the size of the bottom end of the injection channel is larger than the size of the top end, and the connection between the inner wall of the temporary storage chamber and the glue outlet is inclined to form a guide slope; The high-precision dispensing device includes the following dispensing method: S1: The lifting mechanism makes the jet dispensing valve rise, and the temporary storage nozzle is away from the product; S2: The jet dispensing valve sprays glue from the nozzle into the temporary storage nozzle, and the glue is stored in the temporary storage chamber, and glue drops are formed at the glue outlet of the temporary storage nozzle; S3: The lifting mechanism lowers the jet dispensing valve, and the glue drop on the temporary storage nozzle contacts the product. The lifting mechanism raises the jet dispensing valve, and all the glue in the temporary storage chamber is pulled out and adheres to the product.

2. The high-precision dispensing device according to claim 1, characterized in that: The temporary storage nozzle is detachably connected to the nozzle.

3. The high-precision dispensing device according to claim 1 or 2, characterized in that: The main body of the nozzle jet dispensing valve is detachably connected.

4. The high-precision dispensing device according to claim 3, characterized in that: The lifting mechanism includes a cylinder or a linear servo motor.

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