Hot melt adhesive spray gun

Abstract

The utility model discloses a hot melt adhesive spray gun which comprises a base, a plurality of adhesive outlet mechanisms, a connecting mechanism and a plurality of control mechanisms, and the base is provided with an adhesive inlet pipeline and an air inlet pipeline; the plurality of glue outlet mechanisms comprise nozzle openings, glue outlet pipelines and gas outlet pipelines, the gas inlet pipelines are communicated with the gas outlet pipelines through pipelines, and the glue outlet pipelines and the gas outlet pipelines are communicated with the nozzle openings; the connecting mechanism comprises a glue passing pipeline; the glue passing pipeline is communicated between the glue inlet pipeline and the glue outlet pipeline; the control mechanisms and the glue discharging mechanisms are arranged in a one-to-one correspondence mode, each control mechanism comprises a switch assembly, an electromagnetic valve and a heat insulation seat, the switch assemblies are arranged on the glue passing pipeline, the electromagnetic valves are connected with the switch assemblies through pipelines, and the heat insulation seats are connected between the switch assemblies and the electromagnetic valves and used for slowing down heat transfer between the switch assemblies and the electromagnetic valves. The utility model has the advantages of compact structure, small volume and strong structural reliability.

Description

Technical Field

[0001] This utility model relates to the field of wire harness adhesive production technology, and in particular to a hot melt adhesive spray gun. Background Technology

[0002] In the disposable hygiene product manufacturing industry, to improve the elasticity of products such as pull-up diapers and disposable diapers, allowing them to better fit the user's waist and legs and reduce slippage and leakage of urine or bodily fluids, it is often necessary to bond bundles of elastic materials, such as elastic bands, into the product. Before bonding these elastic materials to non-woven fabrics, hot melt adhesive needs to be sprayed onto them. Currently, multi-nozzle hot melt adhesive spray guns are generally used to perform this operation to improve production efficiency. Existing multi-nozzle hot melt adhesive spray guns use solenoid valves to control the adhesive dispensing from the nozzles. Because the hot melt adhesive and hot air in the spray gun have high temperatures, the solenoid valves need to be placed far away from other components of the spray gun. This results in a large size of the hot melt adhesive spray gun, occupying a lot of space, which is not conducive to installation and layout in the production workshop. Furthermore, the solenoid valves or their connecting pipes are more susceptible to damage from impacts, leading to poor structural reliability. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a hot melt adhesive spray gun with a compact structure, small size, and high structural reliability.

[0004] A hot melt adhesive spray gun according to an embodiment of the present invention includes:

[0005] The base is equipped with an adhesive inlet pipe and an air inlet pipe;

[0006] Multiple glue dispensing mechanisms, including a nozzle, a glue dispensing pipeline and an air outlet pipeline, wherein the air inlet pipeline is connected to the air outlet pipeline via a pipeline, and both the glue dispensing pipeline and the air outlet pipeline are connected to the nozzle.

[0007] A connecting mechanism includes a glue-through pipe, which connects the glue inlet pipe and the glue outlet pipe;

[0008] Multiple control mechanisms are set up one-to-one with the dispensing mechanism. The control mechanism includes a switch assembly, a solenoid valve and a heat insulation seat. The switch assembly is set on the dispensing pipeline. The solenoid valve is connected to the switch assembly through the pipeline. The heat insulation seat is connected between the switch assembly and the solenoid valve. The heat insulation seat is used to reduce the heat transfer between the switch assembly and the solenoid valve.

[0009] A hot melt adhesive spray gun according to an embodiment of the present invention has at least the following beneficial effects:

[0010] The heat insulation seat between the switch assembly and the solenoid valve slows down heat transfer between them, preventing heat from flowing through the hot melt adhesive to the switch assembly and then to the solenoid valve. This prevents the solenoid valve from overheating and malfunctioning, potentially causing irreversible damage. It also prevents problems with dispensing control due to solenoid valve overheating, avoiding issues like no dispensing or continuous dispensing from the nozzle, thus reducing the probability of defective products made from wire-like elastic materials or even the final hygiene products. The solenoid valve, heat insulation seat, and switch assembly can be sequentially and securely connected, allowing the solenoid valve to be positioned close to other components of the spray gun, reducing the size of the hot melt adhesive spray gun and facilitating installation in the production workshop. Compared to current technology, the solenoid valve does not need to be located far from other components of the spray gun, and it does not require a long connecting pipe to the switch assembly, reducing the risk of damage to the solenoid valve or its connecting pipes due to impacts, resulting in high structural reliability. By controlling the on / off state of the switch assembly through the solenoid valve, the glue inlet and outlet pipes can be connected or disconnected, ultimately achieving jog dispensing control from the nozzle.

[0011] According to an embodiment of the present invention, a hot melt adhesive spray gun includes a switch assembly comprising a needle seat tube and a ejector pin. The needle seat tube is disposed on the adhesive passage, and the ejector pin is slidably connected inside the needle seat tube. The ejector pin and one end opening of the needle seat tube are engaged to connect or disconnect the needle seat tube.

[0012] According to an embodiment of the present invention, a hot melt adhesive spray gun includes a switch assembly that further includes an air seal block. The air seal block is fixedly connected to the ejector pin and slidably connected to the needle seat tube. The air seal block is divided into a first air chamber and a second air chamber within the needle seat tube. A solenoid valve is connected to the first air chamber and the second air chamber respectively.

[0013] According to an embodiment of the present invention, a hot melt adhesive spray gun is provided in a heat insulation base with a first control air path and a second control air path. A solenoid valve is connected to a first air chamber through the first control air path, and a solenoid valve is connected to a second air chamber through the second control air path.

[0014] According to an embodiment of the present invention, a hot melt adhesive spray gun has an adhesive passage cavity inside the needle seat tube, an adhesive inlet hole on the side wall of the needle seat tube, and an adhesive outlet hole on the bottom wall of the needle seat tube. The adhesive passage cavity is connected to the adhesive inlet hole and the adhesive outlet hole respectively, and is connected to the adhesive passage pipeline through the adhesive inlet hole and the adhesive outlet hole respectively. A ejector pin is provided through the adhesive passage cavity and the adhesive outlet hole, and the ejector pin is engaged with the adhesive outlet hole to control the opening and closing of the adhesive outlet hole.

[0015] According to an embodiment of the present invention, a hot melt adhesive spray gun has a sealing part at one end of the ejector pin near the adhesive outlet, and the sealing part has a conical structure.

[0016] According to an embodiment of the present invention, a hot melt adhesive spray gun further includes a filtering mechanism. The filtering mechanism is disposed on the adhesive inlet pipe and includes a cover, a filtering component and a locking bolt. The locking bolt is threadedly connected to the cover, and the filtering component is disposed between the cover and the locking bolt. The locking bolt is used to connect the filtering component to the bottom side of the cover.

[0017] According to an embodiment of the present invention, a hot melt adhesive spray gun has a filter assembly including a filter screen and a filter sleeve, with the filter sleeve surrounding the outside of the filter screen.

[0018] According to an embodiment of the present invention, a hot melt adhesive spray gun includes a filtering mechanism that further includes a sealing ring, which surrounds the side of the cover along the circumferential direction.

[0019] According to an embodiment of the present invention, a hot melt adhesive spray gun has a base provided with multiple air passage connectors, all of which are connected to an air inlet pipe.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a perspective view of a hot melt adhesive spray gun according to an embodiment of the present utility model;

[0023] Figure 2 This is a perspective view of the base of a hot melt adhesive spray gun according to an embodiment of the present utility model;

[0024] Figure 3 This is a perspective view of the connection mechanism and control mechanism of a hot melt adhesive spray gun according to an embodiment of the present utility model;

[0025] Figure 4 This is a perspective view of a control mechanism for a hot melt adhesive spray gun according to an embodiment of the present utility model;

[0026] Figure 5 This is a cross-sectional view of a control mechanism for a hot melt adhesive spray gun according to an embodiment of the present utility model;

[0027] Figure 6 This is a perspective view of the dispensing mechanism of a hot melt adhesive spray gun according to an embodiment of the present utility model.

[0028] Figure 7 This is a side view of the dispensing mechanism of a hot melt adhesive spray gun according to an embodiment of the present utility model;

[0029] Figure 8This is a perspective view of the filtering mechanism of a hot melt adhesive spray gun according to an embodiment of the present utility model;

[0030] Figure 9 This is a cross-sectional view of the filtering mechanism of a hot melt adhesive spray gun according to an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] Base 100; Glue inlet pipe 110; Air inlet pipe 120; Glue connector 130; Air connector 140;

[0033] Glue dispensing mechanism 200; nozzle 210; glue dispensing pipe 220; air outlet pipe 230;

[0034] Connection mechanism 300; Adhesive hose 310; Ventilation hose 320;

[0035] Control mechanism 400; Solenoid valve 410; Heat insulation seat 420; First control air circuit 421; Second control air circuit 422; Switch assembly 430; Needle seat tube 431; Ejector pin 432; Sealing part 433; Air seal block 434; First air chamber 435; Second air chamber 436; Adhesive passage chamber 437; Adhesive inlet hole 438; Adhesive outlet hole 439;

[0036] Filter mechanism 500; cover 510; filter assembly 520; filter screen 521; filter sleeve 522; locking bolt 530; sealing ring 540. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0038] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] In the description of a utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first" and "second" are used, they are merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or the order of the indicated technical features.

[0040] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0041] Reference Figures 1 to 9 This utility model provides a hot melt adhesive spray gun, including a base 100, multiple dispensing mechanisms 200, multiple control mechanisms 400, and a connecting mechanism 300. The control mechanisms 400 are correspondingly arranged with the dispensing mechanisms 200. The base 100 is provided with an adhesive inlet pipe 110 and an air inlet pipe 120. The dispensing mechanism 200 includes a nozzle 210, an dispensing pipe 220, and an air outlet pipe 230. The air inlet pipe 120 is connected to the air outlet pipe 230 via a pipe. Both the dispensing pipe 220 and the air outlet pipe 230 are connected to the nozzle 210. The hot melt adhesive output from the dispensing pipe 220 and the high-pressure air output from the air outlet pipe 230 converge at the nozzle 210 and are then ejected, increasing the ejection speed of the hot melt adhesive. The connecting mechanism 300 includes a glue-passing pipe 310, which is connected to the dispensing pipe 110 and the dispensing mechanism 200. The glue lines 220 are connected to allow hot melt adhesive to flow from the glue inlet line 110 to the glue outlet line 310, then to the glue outlet line 220, and finally to the nozzle 210. The control mechanism 400 includes a switch assembly 430, a solenoid valve 410, and a heat insulation seat 420. The switch assembly 430 is disposed on the glue outlet line 310. The solenoid valve 410 is connected to the switch assembly 430 through a pipe. The heat insulation seat 420 is connected between the switch assembly 430 and the solenoid valve 410. The heat insulation seat 420 is used to reduce heat transfer between the switch assembly 430 and the solenoid valve 410. The solenoid valve 410 is used to control the on / off state of the switch assembly 430 to connect or disconnect the glue inlet line 110 and the glue outlet line 220. Specifically, the heat insulation seat 420 is provided with polyurethane, aerogel, or other materials that can provide heat insulation to achieve the heat insulation effect.

[0042] Specifically, refer to Figure 1 and Figure 2The base 100 is also provided with an adhesive connector 130 and an air connector 140. The adhesive connector 130 is connected to the adhesive inlet pipe 110, and the air connector 140 is connected to the air inlet pipe 120. The adhesive connector 130 and the air connector 140 are respectively connected to an external hot melt adhesive source and an air source so that hot melt adhesive and high-pressure gas can enter the base 100.

[0043] Specifically, refer to Figure 3 The connecting mechanism 300 is connected to the base 100, multiple dispensing mechanisms 200, and multiple control mechanisms 400 respectively. The connecting mechanism 300 is also provided with a venting pipe 320, which connects the inlet pipe 120 and the outlet pipe 230 so that high-pressure gas can be blown from the inlet pipe 120 to the venting pipe 320, then to the outlet pipe 230, and finally to the nozzle 210.

[0044] Specifically, refer to Figure 3 The switch assembly 430 is inserted into the connecting mechanism 300 from one side and is fixedly connected to it. The switch assembly 430 is provided with an inlet hole 438 and an outlet hole 439. The glue passage 310 inside the connecting mechanism 300 is divided into two parts: one part of the glue passage 310 is close to the base 100, and the other part is close to the outlet mechanism 200. The inlet hole 438 of the switch assembly 430 connects to the part of the glue passage 310 close to the base 100, and the outlet hole 439 of the switch assembly 430 connects to the part of the glue passage 310 close to the outlet mechanism 200. By controlling the on / off state of the switch assembly 430, the on / off state of the glue passage 310 is controlled.

[0045] By providing a heat insulation seat 420 between the switch assembly 430 and the solenoid valve 410, the heat insulation seat 420 can slow down the heat transfer between the switch assembly 430 and the solenoid valve 410, preventing heat from being transferred from the hot melt adhesive flowing through the switch assembly 430 to the switch assembly 430 and then to the solenoid valve 410. This prevents the solenoid valve 410 from malfunctioning due to overheating, or even causing irreversible damage, and avoids problems with adhesive dispensing control due to overheating of the solenoid valve 410. This also prevents the nozzle 210 from not dispensing adhesive or from not dispensing adhesive, reducing the probability of defective products from the wire harness elastic material and even the final sanitary products. The solenoid valve 410, the heat insulation seat 420, and the switch assembly 430 can be sequentially attached and connected, and the solenoid valve 410 can be placed close to other components of the spray gun, reducing the size of the hot melt adhesive spray gun and facilitating its installation and layout in the production workshop. Compared to current technology, the solenoid valve 410 does not need to be located far from other components of the spray gun, and it also does not need to be connected to the switch assembly 430 via a long connecting pipe. This reduces the risk of damage to the solenoid valve 410 or its connecting pipe due to impacts, thus improving reliability. By controlling the on / off state of the switch assembly 430 through the solenoid valve 410, the glue inlet pipe 110 and the glue outlet pipe 220 can be connected or disconnected, ultimately achieving jog control of glue dispensing from the nozzle 210.

[0046] As a preferred embodiment, multiple dispensing mechanisms 200 are arranged along the length of the connecting mechanism 300, and all of the dispensing mechanisms 200 are connected to the same side of the connecting mechanism 300. Furthermore, multiple control mechanisms 400 are also correspondingly arranged along the length of the connecting mechanism 300, and all of the control mechanisms 400 are connected to the same side of the connecting mechanism 300. Each control mechanism 400 corresponds one-to-one with a dispensing mechanism 200, with one control mechanism 400 controlling one dispensing mechanism 200.

[0047] According to some embodiments of this application, refer to Figure 5 The switch assembly 430 includes a needle seat tube 431 and a ejector pin 432. The needle seat tube 431 is disposed on the adhesive passage 310. The ejector pin 432 is slidably connected inside the needle seat tube 431. The ejector pin 432 and the open end of the needle seat tube 431 are engaged to connect or disconnect the needle seat tube 431. The slidable connection of the ejector pin 432 inside the needle seat tube 431 makes the structure of the switch assembly 430 more compact.

[0048] Furthermore, referring to Figure 5The switching assembly 430 also includes an air-sealing block 434, which is fixedly connected to the ejector pin 432 and slidably connected to the needle seat tube 431. The air-sealing block 434 divides the needle seat tube 431 to form a first air chamber 435 and a second air chamber 436. A solenoid valve 410 is connected to both the first air chamber 435 and the second air chamber 436. The solenoid valve 410 is connected to both the first air chamber 435 and the second air chamber 436 through connecting pipes, and can input pressurized air into the first air chamber 435 and the second air chamber 436 respectively to push the air-sealing block 434 to move within the needle seat tube 431, thereby causing the ejector pin 432 to insert and move at one end opening of the needle seat tube 431. Specifically, when the solenoid valve 410 inputs air into the first air chamber 435, the second air chamber 436 discharges the air inside the chamber. At this time, the air in the first air chamber 435 pushes the air seal block 434 to move towards the second air chamber 436. When the solenoid valve 410 inputs air into the second air chamber 436, the first air chamber 435 discharges the air inside the chamber. At this time, the air in the second air chamber 436 pushes the air seal block 434 to move towards the first air chamber 435.

[0049] Furthermore, referring to Figure 4 and Figure 5 The heat insulation base 420 is equipped with a first control air passage 421 and a second control air passage 422. The solenoid valve 410 is connected to the first air chamber 435 through the first control air passage 421, and the solenoid valve 410 is connected to the second air chamber 436 through the second control air passage 422. No additional connecting pipe is needed between the solenoid valve 410 and the needle seat tube 431, further reducing the overall size of the hot melt adhesive spray gun and further preventing damage to the solenoid valve 410 or its connecting pipe from impacts.

[0050] According to some embodiments of this application, refer to Figure 5 The needle seat tube 431 has a glue-feeding cavity 437, a glue inlet hole 438 on its side wall, and a glue outlet hole 439 on its bottom wall. The glue-feeding cavity 437 connects to both the glue inlet hole 438 and the glue outlet hole 439, and is connected to the glue-feeding conduit 310. A ejector pin 432 passes through both the glue-feeding cavity 437 and the glue outlet hole 439, and is inserted into the glue outlet hole 439 to control the opening and closing of the glue outlet hole 439. The ejector pin 432's penetration through the glue-feeding cavity 437 and the glue outlet hole 439 further enhances the structural compactness of the switch assembly 430.

[0051] Furthermore, referring to Figure 5The ejector pin 432 has a sealing portion 433 at one end near the glue outlet 439. The sealing portion 433 has a conical structure. The conical sealing portion 433 can improve the sealing performance of the ejector pin 432 on the glue outlet 439. When the sealing portion 433 moves to the glue outlet 439, the conical sealing portion 433 matches the glue outlet 439, thus isolating the glue outlet 439. When the sealing portion 433 moves away from the glue outlet 439, the conical sealing portion 433 separates from the glue outlet 439, thus connecting the inside and outside of the glue outlet 439.

[0052] According to some embodiments of this application, refer to Figures 8 to 9 The system also includes a filter mechanism 500, which is mounted on the glue inlet pipe 110. The filter mechanism 500 includes a cover 510, a filter assembly 520, and a locking bolt 530. The locking bolt 530 is threadedly connected to the cover 510. The filter assembly 520 is positioned between the cover 510 and the locking bolt 530, which connects the filter assembly 520 to the bottom side of the cover 510. The filter assembly 520 is connected to the bottom side of the cover 510 via the locking bolt 530, facilitating its replacement. Filtering the hot melt adhesive through the filter mechanism 500 reduces impurities in the hot melt adhesive, improving the purity of the hot melt adhesive sprayed from the nozzle 210 and enhancing the spraying quality. Filtering the hot melt adhesive also reduces the likelihood of impurities clogging the glue inlet pipe 110, glue outlet pipe 310, glue outlet pipe 220, and nozzle 210, thus lowering the failure rate of the hot melt adhesive spray gun. Specifically, the glue inlet pipe 110 is divided into two parts: one part is near the glue inlet connector 130, and the other part is near the connecting mechanism 300. The filter assembly 520 connects the glue inlet pipe 110 near the glue inlet connector 130 and the glue inlet pipe 110 near the connecting mechanism 300, so that the filter mechanism 500 is mounted on the glue inlet pipe 110. Specifically, hot melt adhesive enters from the glue inlet connector 130 into the glue inlet pipe 110 near the glue inlet connector 130, then flows into the filter mechanism 500 for filtration, then flows into the glue inlet pipe 110 near the connecting mechanism 300, and then flows into the glue passage pipe 310.

[0053] Furthermore, the filter assembly 520 includes a filter screen 521 and a filter sleeve 522, with the filter sleeve 522 surrounding the outside of the filter screen 521. The filter screen 521 is used to filter the hot melt adhesive, and the filter sleeve 522 is used to limit the filter screen 521, preventing it from detaching and causing blockage in the adhesive inlet pipe 110 or other pipes. After removing the locking bolt 530 from the cover 510, the filter screen 521 to be replaced can be removed from the inside of the filter sleeve 522. Then, a new filter screen 521 is placed inside the filter sleeve 522. Finally, the filter assembly 520 is reconnected to the bottom of the cover 510 using the locking bolt 530, thus replacing the filter screen 521 without having to replace both the filter screen 521 and the filter sleeve 522 together.

[0054] Furthermore, the filter mechanism 500 also includes a sealing ring 540, which surrounds the circumferential side of the cover 510. The sealing ring 540 prevents hot melt adhesive from overflowing from the connection gap between the base 100 and the filter mechanism 500, reducing hot melt adhesive waste and keeping the hot melt adhesive spray gun clean.

[0055] According to some embodiments of this application, refer to Figure 1 The base 100 is provided with multiple air connectors 140, all of which are connected to the air intake pipe 120. By using multiple air connectors 140 to supply air to the air intake pipe 120, the stability of the air source pressure in the air intake pipe 120 is improved, ensuring that sufficient high-pressure air is obtained from the nozzle 210 to combine with the hot melt adhesive, thus ensuring the injection speed of the hot melt adhesive.

[0056] As a preferred option, refer to Figure 6 and Figure 7 The dispensing mechanism 200 has an M-shaped structure, and the nozzle 210 is located on the bottom side of the middle part of the M-shaped dispensing mechanism. This can reduce the impact of the airflow around the dispensing mechanism 200 on the hot melt adhesive sprayed from the nozzle 210, and ensure the consistency of the hot melt adhesive spraying direction. At the same time, the M-shaped dispensing mechanism 200 forms a heat insulation cover, reducing the cooling effect of the cold air around the dispensing mechanism 200 on the hot melt adhesive.

[0057] Working principle: The air connector 140 is connected to an external high-pressure air source. The high-pressure gas passes through the air connector 140, the air inlet pipe 120, the air passage pipe 320, and the air outlet pipe 230 in sequence before reaching the nozzle 210. The glue connector 130 is connected to an external hot melt adhesive source. The hot melt adhesive passes through the glue connector 130, the glue inlet pipe 110, the filter mechanism 500, the glue passage pipe 310, the switch assembly 430, and the glue outlet pipe 220 in sequence before finally flowing to the nozzle 210. The hot melt adhesive output from the glue outlet pipe 220 and the high-pressure air output from the air outlet pipe 230 merge at the nozzle 210. The high-pressure air is used to enhance the kinetic energy of the hot melt adhesive, causing the hot melt adhesive to be sprayed at high speed onto the wire bundle elastic material. The air pressure in the first air chamber 435 and the second air chamber 436 is controlled by the solenoid valve 410, so as to drive the air sealing block 434 to move the ejector pin 432 in the needle seat tube 431 and at the glue outlet 439. The sealing part 433 of the ejector pin 432 is used to close or open the glue outlet 439, so as to isolate or connect the glue inlet pipe 110 and the glue outlet pipe 220, realize the control of the hot melt glue flowing to the nozzle 210, and finally realize the jog glue dispensing control of the nozzle 210.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A hot melt adhesive spray gun, characterized in that, include: The base (100) is provided with an adhesive inlet pipe (110) and an air inlet pipe (120). Multiple glue dispensing mechanisms (200) include a nozzle (210), a glue dispensing pipe (220), and an air outlet pipe (230). The air inlet pipe (120) is connected to the air outlet pipe (230) via a pipe. Both the glue dispensing pipe (220) and the air outlet pipe (230) are connected to the nozzle (210). The connecting mechanism (300) includes a glue-feeding pipe (310) which is connected between the glue inlet pipe (110) and the glue outlet pipe (220); Multiple control mechanisms (400) are provided one-to-one with the dispensing mechanism (200). Each control mechanism (400) includes a switch assembly (430), a solenoid valve (410), and a heat insulation seat (420). The switch assembly (430) is disposed on the dispensing pipeline (310). The solenoid valve (410) is connected to the switch assembly (430) through a pipeline. The heat insulation seat (420) is connected between the switch assembly (430) and the solenoid valve (410). The heat insulation seat (420) is used to reduce the heat transfer between the switch assembly (430) and the solenoid valve (410).

2. The hot melt adhesive spray gun according to claim 1, characterized in that, The switch assembly (430) includes a needle seat tube (431) and a ejector pin (432). The needle seat tube (431) is disposed on the adhesive passage (310). The ejector pin (432) is slidably connected inside the needle seat tube (431). The ejector pin (432) is engaged with one end opening of the needle seat tube (431) to connect or disconnect the needle seat tube (431).

3. A hot melt adhesive spray gun according to claim 2, characterized in that, The switch assembly (430) further includes an air seal block (434), which is fixedly connected to the ejector pin (432) and slidably connected to the needle seat tube (431). The air seal block (434) divides the needle seat tube (431) to form a first air chamber (435) and a second air chamber (436). The solenoid valve (410) is connected to the first air chamber (435) and the second air chamber (436) respectively.

4. A hot melt adhesive spray gun according to claim 3, characterized in that, The heat insulation seat (420) is provided with a first control air passage (421) and a second control air passage (422). The solenoid valve (410) is connected to the first air chamber (435) through the first control air passage (421), and the solenoid valve (410) is connected to the second air chamber (436) through the second control air passage (422).

5. A hot melt adhesive spray gun according to claim 2, characterized in that, The needle seat tube (431) is provided with a glue passage cavity (437), the side wall of the needle seat tube (431) is provided with a glue inlet hole (438), and the bottom wall of the needle seat tube (431) is provided with a glue outlet hole (439). The glue passage cavity (437) is connected to the glue inlet hole (438) and the glue outlet hole (439) respectively. The glue passage cavity (437) is connected to the glue passage pipeline (310) through the glue inlet hole (438) and the glue outlet hole (439) respectively. The ejector pin (432) is provided through the glue passage cavity (437) and the glue outlet hole (439). The ejector pin (432) is engaged with the glue outlet hole (439) to control the opening and closing of the glue outlet hole (439).

6. A hot melt adhesive spray gun according to claim 5, characterized in that, The ejector pin (432) has a sealing part (433) at one end near the glue outlet (439), and the sealing part (433) has a conical structure.

7. A hot melt adhesive spray gun according to claim 1, characterized in that, It also includes a filter mechanism (500), which is disposed on the glue inlet pipe (110). The filter mechanism (500) includes a cover (510), a filter assembly (520) and a locking bolt (530). The locking bolt (530) is threadedly connected to the cover (510). The filter assembly (520) is disposed between the cover (510) and the locking bolt (530). The locking bolt (530) is used to connect the filter assembly (520) to the bottom side of the cover (510).

8. A hot melt adhesive spray gun according to claim 7, characterized in that, The filter assembly (520) includes a filter screen (521) and a filter sleeve (522), the filter sleeve (522) being disposed outside the filter screen (521).

9. A hot melt adhesive spray gun according to claim 8, characterized in that, The filter mechanism (500) also includes a sealing ring (540) which surrounds the circumferential side of the cover (510).

10. A hot melt adhesive spray gun according to claim 1, characterized in that, The base (100) is provided with a plurality of air passage connectors (140), and the plurality of air passage connectors (140) are all connected to the air intake pipe (120).

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