WO2021253602A1

WO2021253602A1 - Heating nozzle and hot melt gun

Info

Publication number: WO2021253602A1
Application number: PCT/CN2020/109094
Authority: WO
Inventors: 柏永茂; 安刚青; 王腾达
Original assignee: 杭州星战科技有限公司
Priority date: 2020-06-19
Filing date: 2020-08-14
Publication date: 2021-12-23
Also published as: CN111586908A

Abstract

A heating nozzle, comprising an inner electrode, a heat emitting body, and an outer electrode. The heat emitting body is sandwiched between the inner electrode and the outer electrode, and the inner electrode and the outer electrode are respectively connected to an anode and a cathode of a power supply, and are used to supply power to the heat emitting body. When powered on, the heat emitting body emits heat and transmits heat to the inner electrode. The inner electrode comprises a pre-heating ring and a heating cone, the pre-heating ring and the heating cone both being able to emit heat, and the pre-heating ring being positioned on an entry end of the inner electrode. When a glue stick is inserted from the entry end, the front end of the glue stick contacts a cylindrical surface of an inner chamber of the pre-heating ring, and the glue stick is thereby pre-heated and softened. The heating cone abuts the pre-heating ring, the inner surface of the cone being a rotating surface that becomes gradually smaller in the axial direction, and the cone is used to heat and melt the glue stick, melting the glue stick into a liquid. The inner electrode in the heating nozzle provided in the present invention comprises a pre-heating ring and a heating cone, the pre-heating ring contacting a glue stick first. The glue stick is heated twice, and thus the efficiency of heating the glue stick is higher, reducing heating time.

Description

Heating nozzle and hot melt gun

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on June 19, 2020, the application number is 202010567716.5, and the invention title is "a heating nozzle and hot melt gun", the entire content of which is incorporated into this application by reference middle.

Technical field

The present invention relates to the technical field of hot melt tools, and further relates to a heating nozzle. In addition, the present invention also relates to a hot melt gun.

Background technique

Generally, hot melt guns or similar products mostly have a heating and melting device, called a quick-heat gun head or heater, which is heated to a certain temperature to melt the solid glue stick sent into a liquid state. After the liquid glue flows out from the quick-heat gun head Cool and solidify, and paste the corresponding items.

The heating method currently used is usually electric heating. For example, a PTC ceramic heating element with a quadrangular pyramid shape is currently known in the rapid heat gun head. The PTC ceramic heating element generates heat after being energized, and the glue stick is heated and melted, but the PTC ceramic heats up The element has a quadrangular pyramid shape, and the contact part with the glue stick is small, and the heating efficiency of the glue stick is low.

For those skilled in the art, how to improve the heating efficiency of the glue stick and shorten the heating time is a technical problem that needs to be solved at present.

Summary of the invention

The invention provides a heating nozzle, which can improve the heating efficiency of the glue stick and shorten the heating time. The specific scheme is as follows:

A heating nozzle includes an inner electrode, a heating element, and an outer electrode. The heating element is clamped between the inner electrode and the outer electrode. The inner electrode and the outer electrode are respectively connected to the positive and negative terminals of a power supply. The pole is used to supply power to the heating element, and the heating element is energized to generate heat and conduct heat to the inner electrode;

The inner electrode includes a preheating ring and a heating cone, the preheating ring is located at the lead-in end of the inner electrode, and the cylindrical surface of the inner cavity of the preheating ring can contact the surface of the glue stick for preheating and softening; The heating cone is abutted with the preheating ring, and the inner surface is a revolving surface with a tapered conical surface in the axial direction, which is used for heating and melting the glue stick.

Optionally, the heating element includes a heating ring and a heating cone, the heating ring is cylindrical, the inner surface of the heating ring contacts the outer surface of the preheating ring, and the inner surface of the heating cone It is in contact with the outer surface of the heating cone to conduct heat.

Optionally, the outer electrode is a conical surface-shaped revolving surface structure that is in close contact with the outer surface of the heating cone.

Optionally, the heating cone is a concave surface of revolution; the inner surface and the outer surface of the heating cone are both concave surface of revolution; and the outer electrode is a concave surface of revolution.

Optionally, the inner electrode further includes a cylindrical glue inlet and a cylindrical glue outlet, the diameter of the glue inlet is larger than the diameter of the preheating ring, and the diameter of the glue outlet is equal to the diameter of the glue outlet. The diameter of the smallest heating cone.

Optionally, the heating element is an independent whole formed by the preheating ring and the heating cone relatively fixed.

Optionally, the heating ring and the heating cone are independently arranged and insulated from each other, and can be spliced with each other to form the heating body; the heating ring and the heating cone are connected in parallel with each other.

Optionally, the heating element is formed by splicing at least two parts divided in the circumferential direction, and each part includes a part of the heating ring and a part of the heating cone; the parts of each part are arranged independently of each other They are insulated from each other and connected in parallel with each other.

The present invention also provides a hot melt gun, which includes any one of the above-mentioned heating nozzles.

The invention provides a heating nozzle, which includes an inner electrode, a heating element and an outer electrode. The heating element is clamped between the inner electrode and the outer electrode. Power supply, the heating element is energized to generate heat and conduct heat to the inner electrode; the inner electrode includes a preheating ring and a heating cone. Both the preheating ring and the heating cone can generate heat. The preheating ring is located at the lead-in end of the inner electrode. When the glue stick extends from the lead-in end When the glue stick is in contact with the cylindrical surface of the inner cavity of the preheating ring, the glue stick is preheated and softened; the heating cone is connected to the preheating ring, and the inner surface is a revolving surface that gradually shrinks along the axial direction for the glue stick. Heating and melting, the glue stick is melted into liquid; the inner electrode in the heating nozzle provided by the present invention includes a preheating ring and a heating cone. The preheating ring first contacts the glue stick, and the glue stick is heated twice. It is more efficient and shortens the heating time.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Figure 1A is an exploded view of the components of the heating nozzle provided by the present invention;

Figure 1B is a cross-sectional view of the assembled heating nozzle provided by the present invention;

2A is a schematic diagram of the structure of the inner electrode;

Figure 2B is a schematic diagram of the structure of the heating element;

2C is a schematic diagram of the structure of the external electrode provided by the present invention;

Figure 3A is an exploded structural diagram of a second embodiment of a heating element;

Figure 3B is an overall structure diagram of the second embodiment of the heating element after assembly;

Figure 3C is a cross-sectional view of the second embodiment of the heating element after assembly;

Figure 4A is an exploded structure diagram of a third embodiment of the heating element;

Figure 4B is an overall structure diagram of the third embodiment of the heating element after assembly;

Fig. 4C is a cross-sectional view of the third embodiment of the heating element after assembly.

The figure includes:

The inner electrode 1, the preheating ring 11, the heating cone 12, the glue inlet 13, the glue outlet 14, the heating element 2, the heating ring 21, the heating cone 22, and the outer electrode 3.

detailed description

The core of the present invention is to provide a heating nozzle, which can improve the heating efficiency of the glue stick and shorten the heating time.

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the heating nozzle and the hot melt gun of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1A, it is an exploded view of the components of the heating nozzle provided by the present invention, and FIG. 1B is a cross-sectional view of the assembled heating nozzle provided by the present invention; including the inner electrode 1, the heating element 2 and the outer electrode 3, and the heating element 2. Clamped between the inner electrode 1 and the outer electrode 3, the heating element 2 is in the middle, which can be in contact with the inner electrode 1 and the outer electrode 3 respectively. The inner electrode 1 and the outer electrode 3 are respectively connected to the positive and negative electrodes of the power supply for The heating element 2 is powered, and the heating element 2 can be an electric heating element such as a PTC ceramic heating element; the heating element 2 is energized to generate heat and generate heat. The heating element 2 and the internal electrode 1 are in contact with each other and can conduct heat to the internal electrode 1. Made of high material.

As shown in FIG. 2A, it is a schematic diagram of the structure of the inner electrode 1; the inner electrode 1 includes a preheating ring 11 and a heating cone 12. The two ends penetrate, the preheating ring 11 and the heating cone 12 are butted with each other, the diameter of the largest inner diameter of the heating cone 12 is equal to the diameter of the preheating ring 11, and the heating cone 12 is butted to the preheating ring 11. The preheating ring 11 is located at the lead-in end of the inner electrode 1. The inner cavity surface of the preheating ring 11 is cylindrical, and the size matches the outer diameter of the glue stick. The glue stick can just contact the outer surface of the glue stick when inserted. The cylindrical surface of the inner cavity of the heat ring 11 can transfer heat to the glue stick when it is in contact with the surface of the glue stick, so that the glue stick will be preheated and softened. When the glue stick moves forward to contact the heating cone 12, it further contacts the rotating surface of the inner cavity of the heating cone 12 to further heat the glue stick for heating and melting the glue stick so that it becomes liquid and then discharged.

The heating nozzle provided by the present invention heats the glue stick in two stages by setting the preheating ring 11 and the heating cone 12 at the inner electrode 1. The glue stick first reaches the preheating ring 11 and then reaches the heating cone 12. When the heating ring 11 is in contact, since the preheating ring 11 has a cylindrical surface, it can have a larger contact area with the glue stick, so that the glue stick is softened from a solid state, and when it moves further to the heating cone 12, it is further heated by the heating cone 12 A liquid is formed, which accelerates the melting rate of the glue stick when heated, and shortens the heating time.

On the basis of the above solution, the heating element 2 provided by the present invention includes a heating ring 21 and a heating cone 22, as shown in FIG. 2B, which is a schematic structural diagram of the heating body 2; The shape of the heating ring 22 is a surface of revolution; the heating ring is sleeved outside the inner electrode 1, the inner surface of the heating ring 21 and the outer surface of the preheating ring 11 contact and conduct heat, and the inner surface of the heating cone 22 contacts the outer surface of the heating cone 12 to conduct heat. The contact area between the inner surface of the heating element 2 and the outer surface of the inner electrode 1 is larger, so that a better heat transfer effect can be achieved.

The heating element 2 is a special-shaped structure, which is composed of a cylindrical heating ring 21 and a conical heating cone 22. The heating element is made of powder compaction. The cylindrical section also has a structural enhancement effect on the heating element itself, reducing the parts Due to the risk of damage during assembly and use, the qualification rate and service life of parts during manufacturing and processing are improved. The electrode can also be positioned by setting the cylindrical section and the conical section.

As shown in FIG. 2C, it is a schematic diagram of the structure of the outer electrode 3 provided by the present invention; the outer electrode 3 is of a rotating surface structure, and the inner surface of the outer electrode 3 is in contact with the outer surface of the heating cone 22; the inner electrode 1 and the outer electrode 3 They are respectively connected to the positive and negative electrodes of the power supply to supply power to the heating element 2.

The heating cone 12 is a concave surface of revolution, and its section line is a concave arc; the inner surface of the heating cone 22 is in contact with the heating cone for heat conduction, so the inner surface of the heating cone 22 is a concave surface of revolution; the heating cone The outer surface of 22 is also set as a concave curved surface of revolution; the outer electrode 3 is a concave curved surface of revolution, which is in contact with the outer surface of the heating cone 22 and adopts the same structure.

As shown in Figure 2A, the inner electrode 1 of the present invention also includes a cylindrical glue inlet 13 and a cylindrical glue outlet 14. The diameter of the glue inlet 13 is larger than the diameter of the preheating ring 11, and the glue inlet 13 is connected to the preheating ring 11. A step is formed between the hot rings 11, and the diameter of the glue inlet is larger than the diameter of the glue stick, which facilitates the positioning and insertion of the glue stick; the diameter of the glue outlet 14 is equal to the smallest diameter of the heating cone 12, and the contact between the glue stick and the heating cone 22 is changed. It is liquid, and the glue outlet 14 is a thin cylindrical structure, which is convenient for diversion of glue.

The present invention provides three specific setting forms of the heating element 2:

The first type: the heating element 2 is an independent whole formed by the preheating ring 11 and the heating cone 12 relatively fixed, that is, the arrangement form corresponding to FIG. 2B, and the preheating ring 11 and the heating cone 12 are integrally processed and formed. In this embodiment, the inner electrode 1 and the outer electrode 3 are electrically connected to the heating element 2 respectively.

The second type: the heating ring 21 and the heating cone 22 are independently arranged and insulated from each other, and can be spliced with each other to form the heating element 2; as shown in FIG. 3A, it is an exploded structure diagram of the second embodiment of the heating element 2; The overall structure of the second embodiment of the body 2 after assembling; Figure 3C is a cross-sectional view of the second embodiment of the heating body 2 after assembling; wherein the heating ring 21 and the heating cone 22 are independent individuals, which are spliced together to form a heating body 2. The heating ring 21 and the heating cone 22 are connected in parallel with each other and independently connected to the power supply; since the heating ring 21 and the heating cone 22 are connected to the power supply in parallel, they can reduce the resistance and increase the current, thereby improving the thermal efficiency. In this embodiment, the inner electrode 1 and the outer electrode 3 are electrically connected to the heating element 2 respectively, but the relatively independent heating ring 21 and the heating cone 22 are not in direct conductive contact and are kept insulated.

After the heating ring 21 is connected to the lead wire, it is directly connected in parallel with the outer electrode 3, because the outer electrode 3 and the heating cone 22 are conductive, and form a pole after being connected in parallel. The heating ring 21 and the heating cone 22 share the internal electrode 1 to form another pole, and no additional lead is required. The heating ring 21, the heating cone 22 and the inner electrode 1 are all electrically connected.

Of course, in addition to the above solution, it is also possible to divide the heating element 2 into a larger number of independent individuals and then join each other, and these specific embodiments should all be included in the protection scope of the present invention.

The third type: the heating element 2 is formed by splicing at least two segments divided in the circumferential direction. Each segment includes a part of the heating ring 21 and a part of the heating cone 22. In this embodiment, the outer surface of the inner electrode 1 and the outer electrode 3 The contact surface between the inner surface and the heating element 2 should be electrically insulated; as shown in Figure 4A, it is the exploded structure diagram of the third embodiment of the heating element 2; Figure 4B is the assembled whole of the third embodiment of the heating element 2 Structural diagram; Figure 4C is a sectional view of the third embodiment of the heating element 2 after assembly; each of the lobes preferentially adopts a centrally symmetrical arrangement, a part of the heating ring 21 and a part of the heating cone 22 are relatively fixed to form a single lobed , The heating element 2 is formed by a plurality of split lobes spliced in the circumferential direction, and the lobes of each block are kept independent of each other and insulated from each other. The lobes of each block are connected in parallel with each other, which can reduce the resistance and increase the current. The effect of, and then improve the thermal efficiency.

The same pole of each split of the heating element 2 is connected in parallel and then the inner electrode 1 or the outer electrode 3, and correspondingly, the other pole of each split is connected in parallel and then the outer electrode 3 or the inner electrode 1 is connected. Each part of the heating element 2 is distributed separately from each other, insulated from each other, and kept insulated from the inner electrode 1 and the outer electrode 3, and an insulating isolation layer is provided.

The present invention also provides a hot melt gun, including the above-mentioned heating nozzle, which can achieve the same technical effect; please refer to the prior art for the structure of other parts of the hot melt gun, and the present invention will not be repeated here.

The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims

A heating nozzle, characterized by comprising an inner electrode (1), a heating body (2) and an outer electrode (3), the heating body (2) is clamped between the inner electrode (1) and the outer electrode (3) Between (3), the inner electrode (1) and the outer electrode (3) are respectively connected to the positive and negative electrodes of a power source, and are used to supply power to the heating element (2), and the heating element (2) is energized Generate heat and conduct heat to the inner electrode (1);

The inner electrode (1) includes a preheating ring (11) and a heating cone (12), the preheating ring (11) is located at the lead-in end of the inner electrode (1), and the preheating ring (11) The cylindrical surface of the inner cavity can be in contact with the surface of the glue stick for preheating and softening; the heating cone (12) is connected to the preheating ring (11), and the inner surface is a revolving surface that is tapered along the axial direction for alignment The glue stick melts when heated.
The heating nozzle according to claim 1, wherein the heating element (2) includes a heating ring (21) and a heating cone (22), the heating ring (21) is cylindrical, and the heating ring The inner surface of (21) is in contact with the outer surface of the preheating ring (11) to conduct heat, and the inner surface of the heating cone (22) is in contact with the outer surface of the heating cone (12) to conduct heat.
The heating nozzle according to claim 2, characterized in that, the outer electrode (3) is a rotating surface structure that is in contact with the outer surface of the heating cone (22).
The heating nozzle according to claim 3, wherein the heating cone (12) is a concave curved surface of revolution; the inner and outer surfaces of the heating cone (22) are both concave curved surfaces of revolution; The outer electrode (3) is a concave surface of revolution.
The heating nozzle according to claim 2, wherein the inner electrode (1) further comprises a cylindrical glue inlet (13) and a cylindrical glue outlet (14), the glue inlet (13) The diameter of) is greater than the diameter of the preheating ring (11), and the diameter of the glue outlet (14) is equal to the smallest diameter of the heating cone (12).
The heating nozzle according to claim 2, wherein the heating element (2) is an independent whole formed by the preheating ring (11) and the heating cone (12) relatively fixed.
The heating nozzle according to claim 2, wherein the heating ring (21) and the heating cone (22) are independently arranged and insulated from each other, and can be spliced with each other to form the heating body (2); The heating ring (21) and the heating cone (22) are connected in parallel with each other.
The heating nozzle according to claim 2, characterized in that the heating element (2) is formed by splicing at least two segments divided in the circumferential direction, and each segment includes a part of the heating ring (21) And a part of the heating cone (22); the lobes of each block are independently arranged and insulated from each other, and are connected in parallel with each other.
A hot melt gun, characterized by comprising the heating nozzle according to any one of claims 1 to 8.