WO2021253601A1

WO2021253601A1 - Drip-proof nozzle and hot melt gun

Info

Publication number: WO2021253601A1
Application number: PCT/CN2020/109093
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: CN111570206A

Abstract

A drip-proof nozzle and a hot melt gun, comprising a heating head (1), a pushing piece (2), a sealing piece (3), and a return piece (4). The heating head (1) is used to heat the front part of a glue stick to cause the solid glue stick to melt, the pushing piece (2) is in contact with the rear part of the glue stick and is used to push the glue stick towards the heating head (1), and the sealing piece (3) is sleeved around the outside of the heating head (1), the pushing piece (2), and the glue stick, and is used to maintain an airtight seal. The pushing piece (2) is able to move relative to the sealing piece (3), and the return piece (4) is able to cause the pushing piece (2) to move, thereby increasing the space in a liquid glue chamber formed by the pushing piece (2) and the sealing piece (3) so as to suck liquid glue back in. Thus, retraction of liquid glue into a glue outlet of the heating head is achieved, preventing glue from continuing to flow after glue output is halted.

Description

Anti-drip 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 202010567708.0, and the invention title is "A drip-proof nozzle and hot melt gun", the entire content of which is incorporated herein by reference Applying.

Technical field

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

Background technique

Most hot melt guns or similar products have a heating and melting device and a hot melt head with a glue outlet. The hot melt gun melts the solid glue stick into a liquid state and then flows out to bond objects.

When in use, press the switch to push the solid glue stick forward for a certain distance. When the switch is reset and the use is suspended, the molten glue in the hot melt head still flows out of the glue outlet, which not only easily soils the body, clothing or other items, but also It may also cause accidental injuries such as burns to the human body.

For those skilled in the art, how to prevent the glue from continuing to flow out after stopping the glue is a technical problem that needs to be solved at present.

Summary of the invention

The present invention provides an anti-drip nozzle, which allows the glue to suck back when not in use, and reduces the harm caused by the outflow of the glue. The specific scheme is as follows:

An anti-drip nozzle, including:

Heating head, used to heat the front part of the glue stick;

The pushing part is in contact with the back of the glue stick and is used to push the glue stick to the heating head;

The sealing member is sleeved on the outer periphery of the heating head, the pushing member and the glue stick, and is used to maintain an air seal; the pushing member can move relative to the sealing member;

The resilient member can move the pushing member, thereby increasing the space of the glue cavity formed by the pushing member and the sealing member, so as to suck back the glue.

Optionally, the resilient member is a coil spring, which is arranged between the heating head and the glue stick; when the glue is discharged, the glue stick drives the resilient member to stretch or compress to generate a resilient force.

Optionally, the resilient member has a ring shape, and an elastic piece for contacting with the glue stick is arranged on it, and when the glue is discharged, the elastic piece is squeezed by the glue stick to be elastically deformed to generate elastic force.

Optionally, the resilient member is a spring, which is arranged between the sealing member and the pushing member, and the resilient member can apply a reverse thrust to the pushing member to reduce the pressure of the glue cavity. Internal pressure.

Optionally, the resilient member includes a fixed magnetic member and a movable magnetic member, the fixed magnetic member is fixed on the heating head, and a through hole is provided in the middle of the fixed magnetic member;

The movable magnetic attraction member includes a magnetic attraction section and an insertion section. The magnetic attraction section is located on the front side of the fixed magnetic attraction member, and the two are attracted to each other by magnetic force; The thickness of the magnetic attraction member can be inserted into the through hole provided in the middle of the fixed magnetic attraction member, and the glue stick pushes the end of the insertion section.

Optionally, a diversion groove is provided on the outer peripheral side wall of the magnetic attraction section.

Optionally, the sealing element includes a sealing plug and a hoop shell, the sealing plug is cylindrical and sleeved on the outer periphery of the pushing element and the glue stick;

The hoop shell is sleeved on the outer periphery of the heating head and the sealing plug.

Optionally, the hoop housing includes an upper hoop and a lower hoop that are separated in the axial direction, and a clamping groove arranged obliquely at the front of the upper hoop and a clamp arranged obliquely at the front of the lower hoop. The buckles are locked in conjunction with each other.

Optionally, the heating head includes an inner electrode, an outer electrode, and a heating body. The inner electrode includes a melting conical surface and a preheating cylindrical surface; the heating body includes a heating conical surface and a heating cylindrical surface.

The invention also provides a hot melt gun, which includes the drip-proof nozzle described in any one of the above.

The invention provides a drip-proof nozzle. The heating head is used to heat the front part of the glue stick to melt the solid glue stick, and the pushing part contacts the rear part of the glue stick to push the glue stick to the heating head. After the melted liquid glue stick flows out, replenish new materials in time; the sealing piece is sleeved on the outer periphery of the heating head, the pusher and the glue stick to maintain air-tightness. The pusher can move relative to the sealing piece, thereby changing the pusher and the sealing piece. The formed space of the glue cavity adjusts the air pressure; the resilient member can move the pushing member, thereby increasing the space of the glue cavity, the internal air pressure decreases, and the external air pressure is greater than the internal air pressure. When glue is needed, pressure is applied to the pusher to push the glue stick to move closer to the heating head, and the glue stick is heated to form a liquid discharge; when glue is not needed, the rebounding piece makes the pusher move in the opposite direction to make the glue liquid The inner cavity of the cavity is enlarged, the air pressure is reduced, and the glue flows back into the glue outlet of the heating head under the action of pressure.

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 1 is an exploded view of each component of a specific embodiment of the anti-drip nozzle provided by the present invention;

2 is a diagram of the overall appearance structure of a specific embodiment of the anti-drip nozzle provided by the present invention after being assembled;

3A is a cross-sectional structural view of the initial state of the first embodiment provided by the present invention;

3B is a cross-sectional structural view of the glue state of the first embodiment provided by the present invention;

3C is a cross-sectional structural view of the initial state of the second embodiment provided by the present invention;

3D is a cross-sectional structural view of the glue state of the second embodiment provided by the present invention;

4A is a cross-sectional structural view of the initial state of the third embodiment provided by the present invention;

4B is a cross-sectional structural view of the glue state of the third embodiment provided by the present invention;

4C is a structural diagram of a resilient member of a third embodiment provided by the present invention;

5A is a sectional structural view of the initial state of the fourth embodiment provided by the present invention;

5B is a cross-sectional structural view of the glue state of the fourth embodiment provided by the present invention;

6A is a sectional structural view of the initial state of the fifth embodiment provided by the present invention;

6B is a cross-sectional structural view of the glue state of the fifth embodiment provided by the present invention;

Figure 6C is a structural diagram of a fixed magnetic attraction;

Figure 6D is a structural diagram of the movable magnetic attraction;

Figure 7A is a schematic cross-sectional view of the sealing plug;

Figures 7B and 7C are schematic diagrams of the structure of the upper hoop and the lower hoop, respectively;

Figure 8 is a cross-sectional structural view of the heating head.

The figure includes:

Heating head 1, inner electrode 11, melting conical surface 111, preheating cylindrical surface 112, outer electrode 12, heating body 13, hot conical surface 131, heating cylindrical surface 132, pushing member 2, sealing member 3, sealing plug 31, holding The hoop housing 32, the upper hoop 321, the lower hoop 322, the rebound piece 4, the shrapnel 401, the rebound piece 4, the fixed magnetic piece 41, the movable magnetic piece 42, the magnetic attraction section 421, the insertion section 422, the guide流槽423.

detailed description

The core of the present invention is to provide an anti-drip nozzle, which allows the glue to suck back when not in use, and reduces the harm caused by the outflow of the glue.

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the anti-drip nozzle of the present invention will be described in detail below in conjunction with the drawings and specific embodiments.

As shown in Figure 1, it is an exploded view of the components of a specific embodiment of the anti-drip nozzle provided by the present invention; Figure 2 is the overall appearance structure diagram of a specific embodiment of the anti-drip nozzle provided by the present invention after assembly, Figure 2 The pusher is not included; the anti-drip nozzle provided by the present invention includes: a heating head 1, a pushing element 2, a sealing element 3, a rebound element 4, etc., wherein the heating head 1 is used to heat the front of the glue stick, The solid glue stick is melted into a liquid glue, the solid glue stick is inserted into the feed port at the rear of the heating head 1, and the melted glue is discharged from the discharge port at the front of the heating head.

Pushing part 2 is in contact with the back of the glue stick, and is used to push the glue stick to the heating head 1. When the glue needs to be squeezed out, the pushing part 2 applies pressure to the glue stick, and the glue stick is close to the heating head 1, in front of the glue stick. After the part contacts the heating head 1, it melts into a liquid state, and as the glue stick is continuously fed in, the glue close to the discharge port is discharged.

The sealing element 3 is sleeved on the periphery of the heating head 1, the pushing element 2 and the glue stick, and is used to maintain an air seal. Except for the glue liquid to communicate with the outside through the discharge port of the heating head 1, other positions are kept airtight; the pushing element 2 It can move in a straight line relative to the sealing element 3, and the pushing element 2 and the sealing element 3 are always kept in an air-tight state during the movement.

The resilient member 4 has elastic force, which can make the pushing member 2 move away from the heating head 1 to increase the space of the glue cavity formed by the pushing member 2 and the sealing member 3. The air pressure inside the glue cavity is reduced, which is smaller than the outside Air pressure, suck back glue under the action of air pressure difference.

When the glue is squeezed out, the external force drives the pushing member 2 to move, and the potential energy is accumulated when the pushing member 2 moves; when the external force is removed, the resilient member 4 releases the elastic potential energy and pushes the pushing member 2 in the opposite direction to keep the pushing member 2 away from the heating Head 1.

When squeezing is stopped, because the pusher 2 is moved away from the discharge port of the heating head 1 by the force of the resilient element 4, the glue cavity space formed by the heating head 1, the sealing element 3 and the pusher 2 increases , The internal pressure is lower than the external pressure. By changing the pressure of the glue cavity, the glue can flow into the glue cavity of the heating head 1, and there will be no excess glue flowing out. The excess glue can be prevented immediately after the glue is stopped. Continue to flow out without soiling the body, clothing or other items.

On the basis of the above solution, the present invention provides a specific embodiment. As shown in FIG. 1, the resilient member 4 in this embodiment is a coil spring, and the coil spring is arranged between the heating head 1 and the glue stick. , When the glue is discharged, the glue stick drives the resilient member 4 to stretch or compress to produce a resilient force; as shown in Figure 3A, it is a cross-sectional structural view of the initial state of the first embodiment provided by the present invention; Figure 3B is the first embodiment provided by the present invention An embodiment shows a cross-sectional structure diagram of the glue state; in this embodiment, the resilient member 4 directly contacts the front end of the glue stick and directly exerts a force on the glue stick, and the resilient member can push the glue stick and the pushing member 2 to move at the same time. In this embodiment, when the glue is discharged, the glue stick compresses the spring to shorten and accumulate potential energy, and the length of the resilient member 4 in the glue discharged state is smaller than the length of the initial state. In this embodiment, the front end of the spring close to the glue outlet is in contact with the inner surface of the heating head 1, and the rear end is in contact with the glue stick.

As shown in FIG. 3C, it is a cross-sectional structure diagram of the initial state of the second embodiment provided by the present invention; FIG. 3D is a cross-sectional structure diagram of the glue state of the second embodiment provided by the present invention; in this embodiment The resilient piece 4 directly contacts the front end of the glue stick and directly exerts a force on the glue stick, and the resilient piece can push the glue stick and the pushing piece 2 to move at the same time. In this embodiment, the glue stick pulls the spring to extend and accumulate potential energy during glue discharge, and the length of the resilient member 4 in the glue discharge state is greater than the length in the initial state. In this embodiment, the rear end of the spring is relatively fixed to the heating head 1, and the front end is driven by a glue stick. Specifically, a transmission rod can be provided between the glue stick and the front end of the spring, and the glue stick drives the spring to extend through this rod. long.

The spiral spring is made of metal material and has certain thermal conductivity. The internal electrode heat is transferred to the spiral spring, and the spiral spring directly contacts the glue stick, which can also accelerate the melting rate of the glue stick. The inner electrode of the heating head 1 in contact with the glue stick is provided with a conical surface. The spiral spring preferably adopts a conical shape. The diameter of the rear end of the spiral spring is large and the diameter of the front end is small.

As shown in FIG. 4A, it is a cross-sectional structure diagram of the initial state of the third embodiment provided by the present invention; FIG. 4B is a cross-sectional structure diagram of the glue state of the third embodiment provided by the present invention; FIG. 4C is a diagram provided by the present invention The structure diagram of the resilient member of the third embodiment; in this embodiment, the resilient member 4 is ring-shaped and roughly cone-shaped, and an elastic piece 401 for contact with the glue stick is provided at the front end of the tapered surface, and the elastic piece 401 is at least provided Two, the shrapnel 401 is distributed along the circumferential direction of the tapered surface and bent to the central axis. When the glue is discharged, the glue stick squeezes the elastic piece 401 and elastically deforms to generate elastic force. After the glue is stopped, the elastic piece 401 reverses the glue stick, and the glue The rod and the pushing member 2 move in the opposite direction to generate negative pressure; in addition, since the resilient member 4 is wrapped by molten colloid, the elastic sheet 401 also pulls the molten colloid back into the heating head during the swinging process, preventing the effect of dripping.

As shown in FIG. 5A, it is a cross-sectional structure diagram of the initial state of the fourth embodiment provided by the present invention; FIG. 5B is a cross-sectional structure diagram of the fourth embodiment provided by the present invention in the glue state; the resilient member 4 is a spring, It is arranged between the sealing member 3 and the pushing member 2. One end of the rebounding member 4 contacts the sealing member 3, and the other end contacts the rebounding member 4. The rebounding member 4 can exert a reverse thrust on the pushing member 2. When the rebounding member 4 is directed When moving away from the heating head 1, the pressure inside the glue cavity is reduced, and the external pressure is strong, and the glue flows back into the glue outlet of the heating head 1 under the action of the pressure difference. In this embodiment, the resilient member 4 is not in direct contact with the glue stick, and the resilient member is located outside the glue cavity. In this embodiment, the glue stick squeezes the spring to shorten and accumulate potential energy when the glue is discharged, and the length of the spring is extended when the glue is discharged. The length of the resilient member 4 in the glue discharged state is smaller than the length of the initial state.

As shown in FIG. 6A, it is a cross-sectional structure view of the initial state of the fifth embodiment of the present invention; FIG. 6B is a cross-sectional structure view of the glue state of the fifth embodiment of the present invention; the resilient member 4 It includes a fixed magnetic member 41 and a movable magnetic member 42. FIG. 6C is a structural diagram of the fixed magnetic member 41; FIG. 6D is a structural diagram of the movable magnetic member 42; the fixed magnetic member 41 is fixed on the heating head 1 in position Keep it fixed; a through hole is provided in the middle of the fixed magnetic attraction member 41, and the outer periphery is in contact with the heating head 1; the glue liquid flows through the through hole provided in the middle of the fixed magnetic attraction member 41.

The movable magnetic member 42 includes a magnetic section 421 and a plug-in section 422. The diameter of the magnetic section 421 is larger than the diameter of the plug-in section 422. The plug-in section 422 can be inserted into the through hole in the center of the fixed magnetic member 41. The magnetic section 421 It is impossible to pass through the through hole in the center of the fixed magnetic attraction member 41.

When assembling, the magnetic attraction section 421 is located on the front side of the fixed magnetic attraction member 41. The magnetic attraction section 421 and the fixed magnetic attraction member 41 have opposite magnetic properties and can generate magnetic force. The two attract each other through magnetic force. When the magnetic attraction section 421 After being attracted to each other with the fixed magnetic attraction member 41, the glue liquid is prevented from flowing through. The length of the insertion section 422 is greater than the thickness of the fixed magnetic attraction member 41, and can be inserted into the through hole provided in the middle of the fixed magnetic attraction member 41. The suction section 421 is separated from the fixed magnetic suction member 41, and the glue can flow out normally. When the glue is stopped, the magnetic section 421 and the fixed magnetic member 41 are attracted to each other. Since the movable magnetic member 42 is wrapped by the molten glue, there is almost no air in the glue cavity, and the movable magnetic member 42 pushes the glue stick and pushes. The reverse movement of the part 2 will continuously form an instantaneous vacuum, which will generate negative pressure, so that the glue at the glue outlet will flow back; the process of attracting the movable magnetic attraction member 42 will also drive the glue to move in the opposite direction of the glue. Under the joint action, when the machine stops working, it prevents the colloid from flowing out.

Preferably, as shown in FIG. 6D, a guide groove 423 is provided on the outer peripheral side wall of the magnetic attraction section 421. The guide grooves 423 are evenly distributed along the circumferential direction of the magnetic attraction section 421, and are recessed from the peripheral side walls to the center. Along the thickness direction of the magnetic attraction section 421, the glue can be used to guide the glue when the glue is discharged, reducing the resistance of the glue.

On the basis of any of the above technical solutions and their mutual combination, the sealing member 3 in the present invention includes a sealing plug 31 and a hoop housing 32, as shown in FIG. 7A, which is a schematic cross-sectional view of the sealing plug 31; the sealing plug 31 is a cylinder Shaped, sleeved on the outer periphery of the pusher 2 and the glue stick; the sealing plug 31 and the pusher 2 are in contact with each other to maintain an airtight seal; the hoop shell 32 is sleeved on the outer periphery of the heating head 1 and the sealing plug 31, the heating head 1 and the sealing plug 31 are respectively It is air-tightly sealed with the hoop shell 32, and only the discharge port of the heating head 1 is relatively connected to the outside for glue out. The hoop shell 32 can also play a role of heat insulation.

The hoop housing 32 includes an upper hoop 321 and a lower hoop 322 formed separately along the axial direction. FIGS. 7B and 7C are structural schematic diagrams of the upper hoop 321 and the lower hoop 322, respectively; the front part of the upper hoop 321 is arranged obliquely The buckle and the buckle arranged obliquely at the front of the lower holding hoop 322 cooperate and lock with each other. It can be seen from FIG. Avoid opening and separating the front of the upper hoop 321 and the lower hoop 322.

As shown in Figure 8, it is a cross-sectional structure diagram of the heating head 1; the heating head 1 includes an inner electrode 11, an outer electrode 12, and a heating body 13. The inner electrode 11 and the outer electrode 12 are respectively connected to the positive and negative electrodes of the power supply for power supply The heating body 13 generates heat, which is transferred to the inner electrode 11, and the inner electrode 11 melts the glue stick.

The inner electrode 11 includes a melting conical surface 111 and a preheating cylindrical surface 112. The preheating cylindrical surface 112 is connected to the largest diameter of the melting conical surface 111. When the solid glue stick is inserted into contact with the preheating cylindrical surface 112, the glue stick is preheated It is thermally softened, and when it moves forward and contacts the melting conical surface 111, it is further heated and turned into a liquid. By setting the preheating cylindrical surface 112 to soften the glue stick in advance, the melting rate of the glue stick is improved. The heating body 13 includes a heating conical surface 131 and a heating cylindrical surface 132. The heating conical surface 131 is in close contact with the melting conical surface 111, and the heating cylindrical surface 132 is in close contact with the preheating cylindrical surface 112, so that the heat can be conducted faster, and the body is heated at the same time. 13 Setting the heating cylindrical surface 132 can also improve the structural strength.

The present invention also provides a hot melt gun, including the above-mentioned anti-drip 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

An anti-drip nozzle, which is characterized in that it comprises:

The heating head (1) is used to heat the front part of the glue stick;

The pushing member (2) is in contact with the back of the glue stick and is used to push the glue stick to the heating head (1);

The sealing element (3) is sleeved on the outer periphery of the heating head (1), the pushing element (2) and the glue stick, and is used to maintain an airtight seal; the pushing element (2) can be relative to the sealing element (3) move;

The resilient member (4) can move the pushing member (2), thereby increasing the space of the glue cavity formed by the pushing member (2) and the sealing member (3) to suck back the glue.
The anti-drip nozzle according to claim 1, wherein the resilient member (4) is a coil spring, which is arranged between the heating head (1) and the glue stick; when the glue is discharged, the glue stick drives the The resilient member (4) is stretched or compressed to generate a resilient force.
The anti-drip nozzle according to claim 1, wherein the resilient member (4) is ring-shaped, and an elastic piece (401) for contact with the glue stick is arranged on it, and the glue stick is pressed by the glue stick when the glue is discharged. The elastic piece (401) is elastically deformed to generate elastic force.
The anti-drip nozzle according to claim 1, wherein the resilient member (4) is a spring, and is arranged between the sealing member (3) and the pushing member (2), and the resilient member (4) is The member (4) can apply a reverse thrust to the pushing member (2) to reduce the internal pressure of the glue cavity.
The anti-drip nozzle according to claim 1, wherein the resilient member (4) comprises a fixed magnetic member (41) and a movable magnetic member (42), and the fixed magnetic member (41) is fixed On the heating head (1), a through hole is provided in the middle of the fixed magnetic attraction member (41);

The movable magnetic member (42) includes a magnetic section (421) and an insertion section (422). The magnetic section (421) is located on the front side of the fixed magnetic member (41). Attract each other; the length of the insertion section (422) is greater than the thickness of the fixed magnetic attraction member (41), and can be inserted into the through hole provided in the middle of the fixed magnetic attraction member (41), and the glue stick pushes the The end of the cartridge section (422).
The anti-drip nozzle according to claim 5, characterized in that a diversion groove (423) is provided on the outer peripheral side wall of the magnetic attraction section (421).
The anti-drip nozzle according to any one of claims 2 to 6, wherein the sealing element (3) comprises a sealing plug (31) and a hoop shell (32), and the sealing plug (31) is a cylinder Shape, sleeved on the outer periphery of the pushing member (2) and the glue stick;

The hoop shell (32) is sleeved on the outer periphery of the heating head (1) and the sealing plug (31).
The anti-drip nozzle according to claim 7, characterized in that, the hoop housing (32) comprises an upper hoop (321) and a lower hoop (322) which are separated in the axial direction, and the upper hoop (32) The obliquely arranged slot on the front of 321) and the obliquely arranged buckle on the front of the lower hoop (322) are locked in cooperation with each other.
The anti-drip nozzle according to claim 7, wherein the heating head (1) comprises an inner electrode (11), an outer electrode (12) and a heating body (13), and the inner electrode (11) comprises a melting A conical surface (111) and a preheating cylindrical surface (112); the heating body (13) includes a heating conical surface (131) and a heating cylindrical surface (132).
A hot melt gun, characterized by comprising the anti-drip nozzle according to any one of claims 1 to 9.