Hot melt glue gun

Abstract

The invention relates to a hot melt glue gun which comprises a first valve body, a second valve body, a hot melt glue connector and a gun nozzle, the first valve body and the second valve body are fixedly installed together, the hot melt glue connector is fixedly installed on the first valve body, and the gun nozzle is fixedly installed on the first valve body; the first valve body is provided with a first glue outlet channel, a second glue outlet channel and a third glue outlet channel, the second valve body is provided with a first mounting hole, the first mounting hole is in fluid communication with the first glue outlet channel on the first valve body, and the first mounting hole is in fluid communication with the second glue outlet channel. The second glue outlet channel is in fluid communication with the third glue outlet channel; the hot melt adhesive connector is provided with an adhesive inlet through hole, and the adhesive inlet through hole penetrates through the hot melt adhesive connector. The gun nozzle is provided with a glue outlet through hole, the glue outlet through hole penetrates through the gun nozzle, and when the gun nozzle is fixedly installed on the first valve body, the glue outlet through hole of the gun nozzle is in fluid communication with the third glue outlet channel on the first valve body.

Description

Technical Field

[0001] The invention relates to the field of hot melt adhesive equipment, in particular to a hot melt adhesive gun. Background Art

[0002] A hot melt glue gun is a device that sprays hot melt glue. It is widely used in household products, the automotive industry, or the woodworking industry. A hot melt glue gun includes a glue inlet, a gun nozzle, a gun body, and other parts. It is used to spray hot melt glue from the gun nozzle onto objects such as workpieces under the action of air pressure.

[0003] A Chinese utility model patent with application number CN202021263737.6 discloses a hot melt glue gun, including a shell component, the shell component includes a shell, a glue stick entrance is provided on the left side of the shell, a switch is provided on the right side of the shell, a linkage device is fixedly connected to the left side of the switch, a switch slide is fixedly connected to the right side of the inner wall of the shell, and the upper surface of the switch slide is slidably connected to the lower surface of the switch; a heating device is provided on the upper surface of the shell component; a cutting component is provided on the right side of the heating device; by providing a back-drawing device inside the hot melt glue gun, the molten glue remaining in the nozzle may flow out, and the piston can suck the molten glue back to the second molten glue chamber, solving the wire drawing condition as much as possible, pressing the L-shaped bracket in the cutting component, the blade will cut the molten glue and drop it into the collection tube, because the size of the collection tube used is consistent with the glue stick used, the molten glue in the collection tube can be used twice after solidification, reducing waste. However, the glue discharge of the hot melt glue gun in this patent is not easy to control. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to provide a hot melt glue gun.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a hot melt glue gun, comprising: a first valve body, a second valve body, a hot melt glue joint, and a gun nozzle, the first valve body and the second valve body are fixedly installed together by bolts or screws, the hot melt glue joint is fixedly installed on the first valve body, and the gun nozzle is fixedly installed on the first valve body; the first valve body is provided with a first glue outlet channel, a second glue outlet channel, and a third glue outlet channel, and the second valve body is provided with a first mounting hole, the first mounting hole is connected to the first glue outlet channel on the first valve body on the one hand, and the first mounting hole is connected to the second glue outlet channel on the other hand, and the second glue outlet channel is connected to the third glue outlet channel; the hot melt glue joint has A glue inlet through hole, which passes through the hot melt adhesive joint, and when the hot melt adhesive joint is fixedly installed on the first valve body, the glue inlet through hole of the hot melt adhesive joint is fluidly connected to the first glue outlet channel on the first valve body; the gun nozzle has a glue outlet through hole, which passes through the gun nozzle, and when the gun nozzle is fixedly installed on the first valve body, the glue outlet through hole of the gun nozzle is fluidly connected to the third glue outlet channel on the first valve body; the hot melt glue enters the first glue outlet channel of the first valve body from the glue inlet through hole of the hot melt joint, flows into the first mounting hole of the second valve body from the first glue outlet channel, flows into the second glue outlet channel and the third glue outlet channel from the first mounting hole, and is ejected from the glue outlet through hole of the gun nozzle.

[0006] Preferably, a fourth glue outlet channel and a fifth glue outlet channel are further provided on the second valve body, and the fourth glue outlet channel is fluidly connected to the fifth glue outlet channel, and the fourth glue outlet channel is fluidly connected to the first mounting hole on the second valve body, and the fifth glue outlet channel is fluidly connected to the second glue outlet channel, so that hot melt glue enters from the glue inlet hole of the hot melt joint and flows through the first glue outlet channel on the first valve body, the first mounting hole on the second valve body, the fourth glue outlet channel on the second valve body, the fifth glue outlet channel, the second glue outlet channel, the third glue outlet channel, and the glue outlet hole of the gun nozzle in sequence.

[0007] Preferably, it also includes a piston rod and a sealing disk, one end of the piston rod and the sealing disk are fixedly mounted together; the first mounting hole on the second valve body passes through the second valve body, and the first mounting hole has a first opening; the other end of the piston rod extends into the first mounting hole of the second valve body, and the piston rod reciprocates in the first mounting hole of the second valve body, when the piston rod moves to a preset position, the sealing disk seals the first opening of the first mounting hole, so that the first mounting hole is sealed, and the flow channel of the hot melt glue is cut off at this time; when the piston rod moves in the first mounting hole and the sealing disk opens the first opening of the first mounting hole, the hot melt glue flows along the flow path.

[0008] Preferably, it further comprises an ejector pin, and when the ejector pin is pressed, the ejector pin drives the piston rod to move in the first mounting hole of the second valve body, thereby selectively opening or cutting off the hot melt adhesive flow channel.

[0009] Preferably, it also includes a first valve cover and a first compression spring, wherein a first spring base is provided in the first valve cover, the first valve cover and the second valve body are fixed together by bolts or screws, and a portion of the first compression spring is sleeved on the first spring base, when the piston rod moves in the first mounting hole of the second valve body and the piston rod and the first compression spring contact and compress the first compression spring, during this process the first compression spring has elastic force, when the piston rod compresses the first compression spring to a preset position, the sealing disk connected to the piston rod cuts off the hot melt adhesive flow channel; when the piston rod is not subjected to pressing force, the piston rod returns to its original position under the elastic force of the first compression spring, so that the sealing disk opens the hot melt adhesive flow channel; an accommodating hole is provided on the first valve cover, and at least a portion of the first spring base extends into the accommodating hole on the first valve cover.

[0010] Preferably, the valve further comprises a second valve cover and a second compression spring, wherein the second valve cover is provided with a second mounting hole, the second mounting hole passes through the second valve cover, and the second valve cover and the second valve body are fixed together by bolts or screws; the second compression spring is installed in the second mounting hole of the second valve cover, and at least a part of the ejector pin extends into the second mounting hole of the second valve cover, and the second compression spring is sleeved on the ejector pin, and during the process of pressing the ejector pin, the second compression spring is compressed, and the second compression spring has elastic force, and the ejector pin contacts the piston rod during the process of being pressed, thereby pushing the piston rod to move in the first mounting hole of the second valve body; when the ejector pin is not pressed, the ejector pin is separated from the piston rod and returns to its original position under the elastic force of the second compression spring.

[0011] Preferably, it also includes a limiting tube, the limiting tube having a through hole, the through hole passing through the limiting tube; the limiting tube is installed in the second installation hole of the second valve cover, the second compression spring is installed in the through hole of the limiting tube, and the ejector pin passes through the through hole of the limiting tube, and the second compression spring is sleeved on the ejector pin; a limiting shoulder is provided on the ejector pin, and when the ejector pin is pressed to reach a preset position, the limiting shoulder of the ejector pin and the end of the limiting tube abut together, thereby limiting the ejector pin from continuing to move.

[0012] Preferably, it also includes a third valve body, and the third valve body and the first valve body are fixed together by bolts or screws; the third valve body is provided with a plug-in through hole, and the plug-in through hole passes through the third valve body, the gun nozzle is plugged into the plug-in through hole on the third valve body, and the glue outlet through hole of the gun nozzle and the third glue outlet channel on the first valve body are connected and fluidically connected, so that the gun nozzle can be detachably fixed on the third valve body.

[0013] Preferably, it also includes a heating rod, which is embedded in the first valve body. The heating rod is used to heat the first valve body, so that the hot melt adhesive is heated when flowing through the first valve body, so that the hot melt adhesive is more easily sprayed from the gun nozzle.

[0014] Preferably, it also includes a sleeve cover and an electrode head, wherein the electrode head is fixedly mounted on the sleeve cover, and the sleeve cover is sleeved on the first valve body; when the sleeve cover is sleeved on the first valve body, the electrode head and the heating rod are electrically connected, so that the heating rod is electrically heated.

[0015] It should be noted that, when the second valve cover and the second valve body are fixedly installed together, a chamber of a preset size is formed between the second valve cover and the second valve body, and the chamber is adapted to the sealing disk. When the piston rod moves in the first mounting hole of the second valve body, the sealing disk moves in the chamber; the first opening of the first mounting hole of the second valve body constitutes a part of the chamber; thereby, when the sealing disk moves in the chamber, the first opening of the first mounting hole of the second valve body is opened or closed, thereby selectively opening or closing the hot melt adhesive flow channel.

[0016] The beneficial effects of the present application are as follows: the hot melt glue gun provided by the present application has a simple structure and is easy to assemble and disassemble. The hot melt glue enters from the hot melt glue joint, flows through the first glue outlet channel, the first mounting hole, the fourth glue outlet channel, the fifth glue outlet channel, the second glue outlet channel, and the third glue outlet channel in sequence, and is finally ejected from the glue outlet through hole of the gun nozzle; when it is necessary to cut off the hot melt glue flow channel, the ejector pin is pressed, and the ejector pin drives the piston rod to move in the first mounting hole, so that the sealing disk blocks the first opening of the first mounting hole; when the ejector pin is not pressed, the ejector pin returns to its original position under the drive of the second compression spring, and the piston rod moves in the first mounting hole and returns to its original position under the drive of the first compression spring, and the sealing disk opens the first opening of the first mounting hole, thereby opening the hot melt glue flow channel; the hot melt glue gun provided by the present application is easier to control than the prior art glue discharging method, making the glue discharging more efficient and controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a hot melt glue gun provided by the present invention.

[0018] Figure 2 This is a structural explosion diagram of a hot melt glue gun provided by the present invention. DETAILED DESCRIPTION

[0019] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0020] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations, and the operation steps involved in each embodiment can also be replaced or adjusted in a sequence in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing a certain embodiment and do not mean that the composition and / or sequence are necessary.

[0021] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0022] Please refer to Figure 1-2 The present application provides a hot melt glue gun (hereinafter referred to as "the glue gun"), which includes: a first valve body 1, a second valve body 3, a hot melt glue joint 2, and a gun nozzle 11. The first valve body 1 and the second valve body 3 are fixedly installed together by bolts or screws, the hot melt glue joint 2 is fixedly installed on the first valve body 1, and the gun nozzle 11 is fixedly installed on the first valve body 1; the first valve body 1 is provided with a first glue outlet channel 100, a second glue outlet channel 101, and a third glue outlet channel 102, and the second valve body 3 is provided with a first mounting hole 300. On the one hand, the first mounting hole 300 is fluidically connected to the first glue outlet channel 100 on the first valve body 1, and on the other hand, the first mounting hole 300 is fluidically connected to the second glue outlet channel 101, and the second glue outlet channel 101 is fluidically connected to the third glue outlet channel 102; the hot melt glue joint 2 has a glue inlet through hole 200, and the glue inlet through hole 200 is provided with a first glue outlet channel 100, a second glue outlet channel 101, and a third glue outlet channel 102. The through hole 200 passes through the hot melt adhesive joint 2, and when the hot melt adhesive joint 2 is fixedly installed on the first valve body 1, the glue inlet through hole 200 of the hot melt adhesive joint 2 is fluidically connected to the first glue outlet channel 100 on the first valve body 1; the gun nozzle 11 has a glue outlet through hole 110, and the glue outlet through hole 110 passes through the gun nozzle 11. When the gun nozzle 11 is fixedly installed on the first valve body 1, the glue outlet through hole 110 of the gun nozzle 11 is fluidically connected to the third glue outlet channel 102 on the first valve body 1; the hot melt glue enters the first glue outlet channel 100 of the first valve body 1 from the glue inlet through hole 200 of the hot melt joint 2, flows into the first mounting hole 300 of the second valve body 2 from the first glue outlet channel 100, flows into the second glue outlet channel 101 and the third glue outlet channel 102 from the first mounting hole 300, and is ejected from the glue outlet through hole 110 of the gun nozzle 11.

[0023] In one embodiment of the present application, a fourth glue outlet channel 302 and a fifth glue outlet channel 303 are further provided on the second valve body 3, and the fourth glue outlet channel 302 and the fifth glue outlet channel 303 are fluidly connected, and the fourth glue outlet channel 302 is fluidly connected to the first mounting hole 300 on the second valve body 3, and the fifth glue outlet channel 303 is fluidly connected to the second glue outlet channel 101, so that the hot melt adhesive enters from the glue inlet hole 200 of the hot melt joint 2, and flows through the first glue outlet channel 100 on the first valve body 1, the first mounting hole 300 on the second valve body 2, the fourth glue outlet channel 302 on the second valve body 3, the fifth glue outlet channel 303, the second glue outlet channel 101, the third glue outlet channel 102, and the glue outlet hole 110 of the gun nozzle 11 in sequence.

[0024] In one embodiment of the present application, the glue gun also includes a piston rod 7 and a sealing disk 9, one end of the piston rod 7 and the sealing disk 9 are fixedly installed together; the first mounting hole 300 on the second valve body 3 passes through the second valve body 3, and the first mounting hole 300 has a first opening 301; the other end of the piston rod 7 extends into the first mounting hole 300 of the second valve body 3, and the piston rod 7 reciprocates in the first mounting hole 300 of the second valve body 3, when the piston rod 7 moves to a preset position, the sealing disk 9 seals the first opening 301 of the first mounting hole 300, so that the first mounting hole 300 is sealed, and the flow channel of the hot melt glue is cut off at this time; when the piston rod 7 moves in the first mounting hole 300 and the sealing disk 9 opens the first opening 310 of the first mounting hole 300, the hot melt glue flows along the flow path.

[0025] In one embodiment of the present application, the glue gun further includes a ejector pin 15. When the ejector pin 15 moves, the ejector pin 15 drives the piston rod 7 to move in the first mounting hole 300 of the second valve body 3, thereby selectively opening or cutting off the hot melt adhesive flow channel.

[0026] In one embodiment of the present application, the glue gun also includes a first valve cover 4 and a first compression spring 6. A first spring base 5 is provided in the first valve cover 4. The first valve cover 4 and the second valve body 3 are fixed together by bolts or screws. Part of the first compression spring 6 is sleeved on the first spring base 5. When the piston rod 7 moves in the first mounting hole 300 of the second valve body 3 and the piston rod 7 contacts and compresses the first compression spring 6, the first compression spring 6 has elastic force in this process. When the piston rod 7 compresses the first compression spring 6 to a preset position, the sealing disk 9 connected to the piston rod 7 cuts off the hot melt adhesive flow channel; when the piston rod 7 is not subjected to pressing force, the piston rod 7 returns to its original position under the elastic force of the first compression spring 6, so that the sealing disk 9 opens the hot melt adhesive flow channel; a accommodating hole 40 is provided on the first valve cover 4, and at least a part of the first spring base 5 extends into the accommodating hole 40 on the first valve cover 4.

[0027] In one embodiment of the present application, the glue gun further includes a second valve cover 12 and a second compression spring 13. The second valve cover 12 is provided with a second mounting hole 120, the second mounting hole 120 penetrates the second valve cover 12, and the second valve cover 12 and the second valve body 3 are fixed together by bolts or screws; the second compression spring 13 is installed in the second mounting hole 120 of the second valve cover 12, and at least a portion of the ejector pin 15 extends into the second mounting hole 120 of the second valve cover 12, and the second compression spring 13 is sleeved on the ejector pin 15. During the movement of the ejector pin 15, the second compression spring 13 is compressed, and the second compression spring 13 has elastic force. During the movement of the ejector pin 15, the ejector pin 15 contacts the piston rod 7, thereby pushing the piston rod 7 to move in the first mounting hole 300 of the second valve body 3; when the ejector pin 15 is not subjected to force, the ejector pin 15 is separated from the piston rod 7 and restored to its original position under the elastic force of the second compression spring 13.

[0028] In one embodiment of the present application, the glue gun also includes a limiting tube 14, which has a through hole 140, and the through hole 140 passes through the limiting tube 14; the limiting tube 14 is installed in the second installation hole 120 of the second valve cover 12, the second compression spring 13 is installed in the through hole 140 of the limiting tube 14, and the ejector pin 15 passes through the through hole 140 of the limiting tube 14, and the second compression spring 13 is sleeved on the ejector pin 15; a limiting shoulder 150 is provided on the ejector pin 15, and when the ejector pin 15 reaches a preset position, the limiting shoulder 150 of the ejector pin 15 and the end of the limiting tube 14 abut together, thereby limiting the ejector pin 15 from continuing to move.

[0029] In one embodiment of the present application, the glue gun also includes a third valve body 10, and the third valve body 10 and the first valve body 1 are fixed together by bolts or screws; the third valve body 10 is provided with a plug-in through hole 1000, and the plug-in through hole 1000 passes through the third valve body 10, and the gun nozzle 11 is plugged into the plug-in through hole 1000 on the third valve body 10, and the glue outlet through hole 110 of the gun nozzle 11 and the third glue outlet channel 102 on the first valve body 1 are connected and fluidically connected, so that the gun nozzle 11 is detachably fixedly installed on the third valve body 10.

[0030] In one embodiment of the present application, the glue gun also includes a heating rod 16, which is embedded in the first valve body 1. The heating rod 16 is used to heat the first valve body 1, so that the hot melt adhesive is heated when flowing through the first valve body 1, thereby making it easier for the hot melt adhesive to be sprayed from the gun nozzle 11.

[0031] In one embodiment of the present application, the glue gun also includes a cover 18 and an electrode head 17, wherein the electrode head 17 is fixedly mounted on the cover 18, and the cover 18 is sleeved on the first valve body 1; when the cover 18 is sleeved on the first valve body 1, the electrode head 17 and the heating rod 16 are electrically connected, so that the heating rod 16 is electrically heated.

[0032] It should be noted that, when the second valve cover 12 and the second valve body 3 are fixedly installed together, a chamber 800 of a preset size is formed between the second valve cover 12 and the second valve body 3, and the chamber 800 is adapted to the sealing disk 9. When the piston rod 7 moves in the first mounting hole 300 of the second valve body 3, the sealing disk 9 moves in the chamber 800; the first opening 301 of the first mounting hole 300 of the second valve body 3 constitutes a part of the chamber 800; thereby, when the sealing disk 9 moves in the chamber 800, the first opening 301 of the first mounting hole 300 of the second valve body 3 is opened or closed, thereby selectively opening or closing the hot melt adhesive flow channel.

[0033] The hot melt glue gun provided by the present application has a simple structure and is easy to assemble and disassemble. The hot melt glue enters from the hot melt glue joint, flows through the first glue outlet channel, the first mounting hole, the fourth glue outlet channel, the fifth glue outlet channel, the second glue outlet channel, and the third glue outlet channel in sequence, and is finally ejected from the glue outlet through hole of the gun nozzle; when the hot melt glue flow channel needs to be cut off, the ejector pin is pressed, and the ejector pin drives the piston rod to move in the first mounting hole, so that the sealing disk blocks the first opening of the first mounting hole; when the ejector pin is not pressed, the ejector pin returns to its original position under the drive of the second compression spring, and the piston rod moves in the first mounting hole and returns to its original position under the drive of the first compression spring, and the sealing disk opens the first opening of the first mounting hole, thereby opening the hot melt glue flow channel; compared with the prior art glue discharging method, the hot melt glue gun provided by the present application is easier to control, making the glue discharging more efficient and controllable.

[0034] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A hot melt glue gun, characterized in that: include: A first valve body, a second valve body, a hot melt adhesive joint, and a gun nozzle. The first valve body and the second valve body are fixedly installed together by bolts or screws. The hot melt adhesive joint is fixedly installed on the first valve body, and the gun nozzle is fixedly installed on the first valve body. The first valve body is provided with a first glue outlet channel, a second glue outlet channel, and a third glue outlet channel. The second valve body is provided with a first mounting hole. On the one hand, the first mounting hole is fluidically connected to the first glue outlet channel on the first valve body, and on the other hand, the first mounting hole is fluidically connected to the second glue outlet channel, and the second glue outlet channel is fluidically connected to the third glue outlet channel. The hot melt adhesive joint has a glue inlet through hole, and the glue inlet through hole passes through the A hot melt adhesive joint, and when the hot melt adhesive joint is fixedly installed on the first valve body, the adhesive inlet hole of the hot melt adhesive joint is fluidly connected to the first adhesive outlet channel on the first valve body; the gun nozzle has a adhesive outlet hole, and the adhesive outlet hole passes through the gun nozzle. When the gun nozzle is fixedly installed on the first valve body, the adhesive outlet hole of the gun nozzle is fluidly connected to the third adhesive outlet channel on the first valve body; the hot melt glue enters the first adhesive outlet channel of the first valve body from the adhesive inlet hole of the hot melt joint, flows into the first mounting hole of the second valve body from the first adhesive outlet channel, flows into the second adhesive outlet channel and the third adhesive outlet channel from the first mounting hole, and is ejected from the adhesive outlet hole of the gun nozzle.

2. The hot melt glue gun according to claim 1, characterized in that: The second valve body is also provided with a fourth glue outlet channel and a fifth glue outlet channel, the fourth glue outlet channel and the fifth glue outlet channel are fluidly connected, the fourth glue outlet channel is fluidly connected to the first mounting hole on the second valve body, and the fifth glue outlet channel is fluidly connected to the second glue outlet channel, so that hot melt glue enters from the glue inlet hole of the hot melt joint and flows through the first glue outlet channel on the first valve body, the first mounting hole on the second valve body, the fourth glue outlet channel on the second valve body, the fifth glue outlet channel, the second glue outlet channel, the third glue outlet channel, and the glue outlet hole of the gun nozzle in sequence.

3. The hot melt glue gun according to claim 1, characterized in that: It also includes a piston rod and a sealing disk, one end of the piston rod and the sealing disk are fixedly installed together; a first mounting hole on the second valve body passes through the second valve body, and the first mounting hole has a first opening; the other end of the piston rod extends into the first mounting hole of the second valve body, and the piston rod reciprocates in the first mounting hole of the second valve body, when the piston rod moves to a preset position, the sealing disk seals the first opening of the first mounting hole, so that the first mounting hole is sealed, and the flow channel of the hot melt glue is cut off at this time; when the piston rod moves in the first mounting hole and the sealing disk opens the first opening of the first mounting hole, the hot melt glue flows along the flow path.

4. The hot melt glue gun according to claim 3, characterized in that: It also includes an ejector pin, which drives the piston rod to move in the first mounting hole of the second valve body when the ejector pin moves, thereby selectively opening or cutting off the hot melt adhesive flow channel.

5. The hot melt glue gun according to claim 3, characterized in that: It also includes a first valve cover and a first compression spring, wherein a first spring base is arranged in the first valve cover, the first valve cover and the second valve body are fixed together by bolts or screws, a part of the first compression spring is sleeved on the first spring base, when the piston rod moves in the first mounting hole of the second valve body and the piston rod contacts and compresses the first compression spring, during this process the first compression spring has elastic force, when the piston rod compresses the first compression spring to a preset position, the sealing disk connected to the piston rod cuts off the hot melt adhesive flow channel; When the piston rod is not subjected to a pressing force, the piston rod returns to its original position under the elastic force of the first compression spring, so that the sealing disk opens the hot melt adhesive flow channel; The first valve cover is provided with a receiving hole, and at least a portion of the first spring base extends into the receiving hole on the first valve cover.

6. The hot melt glue gun according to claim 4, characterized in that: The valve body further comprises a second valve cover and a second compression spring. The second valve cover is provided with a second mounting hole, the second mounting hole passes through the second valve cover, and the second valve cover and the second valve body are fixed together by bolts or screws. The second compression spring is installed in the second mounting hole of the second valve cover, and at least a part of the ejector pin extends into the second mounting hole of the second valve cover, and the second compression spring is sleeved on the ejector pin. When the ejector pin moves, the second compression spring is compressed, and the second compression spring has elastic force. When the ejector pin moves, it contacts with the piston rod, thereby pushing the piston rod to move in the first mounting hole of the second valve body. When the ejector pin is not subjected to force, the ejector pin is separated from the piston rod and returns to its original position under the elastic force of the second compression spring.

7. The hot melt glue gun according to claim 6, characterized in that: It also includes a limiting tube, which has a through hole, and the through hole passes through the limiting tube; the limiting tube is installed in the second installation hole of the second valve cover, the second compression spring is installed in the through hole of the limiting tube, and the ejector pin passes through the through hole of the limiting tube, and the second compression spring is sleeved on the ejector pin; a limiting shoulder is provided on the ejector pin, and when the ejector pin reaches a preset position, the limiting shoulder of the ejector pin and the end of the limiting tube abut together, thereby limiting the ejector pin from continuing to move.

8. The hot melt glue gun according to claim 1, characterized in that: It also includes a third valve body, which is fixedly installed with the first valve body by bolts or screws; the third valve body is provided with a plug-in through hole, which passes through the third valve body, and the gun nozzle is plugged into the plug-in through hole on the third valve body, and the glue outlet through hole of the gun nozzle and the third glue outlet channel on the first valve body are connected and fluidically connected, so that the gun nozzle can be detachably fixedly installed on the third valve body.

9. The hot melt glue gun according to claim 3, characterized in that: It also includes a heating rod, which is embedded in the first valve body. The heating rod is used to heat the first valve body, so that the hot melt adhesive is heated when flowing through the first valve body, so that the hot melt adhesive is easier to spray from the gun nozzle.

10. The hot melt glue gun according to claim 9, characterized in that: It also includes a sleeve cover and an electrode head, wherein the electrode head is fixedly mounted on the sleeve cover, and the sleeve cover is sleeved on the first valve body; when the sleeve cover is sleeved on the first valve body, the electrode head and the heating rod are electrically connected, so that the heating rod is electrically heated; when the second valve cover and the second valve body are fixedly mounted together, a chamber of a preset size is formed between the second valve cover and the second valve body, and the chamber and the sealing disk are adapted, and when the piston rod moves in the first mounting hole of the second valve body, the sealing disk moves in the chamber; the first opening of the first mounting hole of the second valve body constitutes a part of the chamber; thereby, when the sealing disk moves in the chamber, the first opening of the first mounting hole of the second valve body is opened or closed, thereby selectively opening or closing the hot melt adhesive flow channel.

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