Gluing gun and gluing equipment

Abstract

The gluing gun comprises a glue gun body, a glue cavity, a glue inlet and a glue outlet are formed in the glue gun body, the glue cavity is provided with a partition part, the partition part divides the glue cavity into a first cavity body and a second cavity body, the first cavity body communicates with the glue inlet, and the second cavity body communicates with the glue outlet; the separating part is provided with at least two channels communicated with the first cavity and the second cavity, and the fluid flowing area of the first cavity is larger than the sum of the fluid flowing areas of all the channels. The glue pressure distribution uniformity effect during glue discharging is improved, the glue cavity is divided into the first cavity and the second cavity through the separation part, the fluid flowing area of the first cavity is larger than the sum of the fluid flowing areas of all the channels, the pressure reduction effect is achieved, the glue pressure distribution of the second cavity is more uniform than that of the first cavity, and the gluing quality can be improved.

Description

Technical Field

[0001] This application relates to the technical field of glue guns, and particularly to a glue gun. Background Art

[0002] Currently, existing glue guns can be divided into needle-type glue guns, scraper-type glue guns, jet-type glue guns, and valve-type glue guns. Among them, valve-type glue guns are often used for automatic glue application on the glass surface. Compared with other types of glue guns, valve-type glue guns have the advantages of more flexible control, higher precision, and stronger adaptability to glue characteristics. The structure of a valve-type glue gun includes a glue inlet, a glue outlet, a glue storage cavity, a thimble, and a driving mechanism. The valve-type glue gun controls the outflow and stop of glue through the movement of a valve core. When the glue gun receives a glue application signal, the driving mechanism drives the valve core to move and opens the glue channel. Under the action of pressure, the glue flows in from the glue inlet and flows out from the glue outlet through the opened channel to achieve the glue application operation. When the glue application is completed or it is necessary to stop the glue application, the driving mechanism acts again to return the valve core to its initial position and close the glue channel, thereby preventing the glue from continuing to flow out.

[0003] However, due to the very high consistency of the glue used for glass, when the glue supply pressure is relatively small, the problem of local glue breakage is likely to occur. When the glue supply pressure is relatively large, it is easy to cause the pressure and glue volume in the middle of the glue mark applied on the glass surface to be significantly higher than those on both sides, which is likely to cause the glue mark to expand outward or the shoulder to collapse. Both of these situations will result in poor uniformity of glass glue application. Summary of the Utility Model

[0004] In order to solve the problem of improving the uniformity effect of glue application, this application provides a glue gun and a glue application device.

[0005] A glue gun provided by this application adopts the following technical solution: It includes a glue gun body, in which a glue cavity, a glue inlet, and a glue outlet are provided. The glue cavity is provided with a separating component, which divides the glue cavity into a first cavity and a second cavity. The first cavity is communicated with the glue inlet, and the second cavity is communicated with the glue outlet. The separating component is provided with at least two channels connecting the first cavity and the second cavity, and the fluid flow area of the first cavity is greater than the sum of the fluid flow areas of all the channels.

[0006] By adopting the above technical solution, when the glue enters the first cavity through the side glue inlet, the pressure distribution in the first cavity is uneven, with a large pressure near the glue inlet side. The glue is divided into multiple flow directions and flows into the second cavity through multiple channels on the separating component. During the process of the glue flowing from the first cavity to the second cavity, the separating component hinders the flow of the glue, thereby improving the uniformity of the glue pressure distribution in the second cavity through the diversion and pressure reduction of the glue.

[0007] Optionally, the glue gun body is provided with a thimble which penetrates through the glue cavity and the separating member, and the thimble can be moved relative to the glue gun body to close or open the glue outlet.

[0008] By adopting the above technical solution, the thimble penetrates through the separating member. When the thimble is bent by impact, the separating member contacts the thimble, and the part of the thimble in the first cavity is supported by two points, namely the separating member and the top wall of the first cavity, so that the part of the thimble in the first cavity has a reaction force against deformation, and thus the separating member has a supporting effect on the thimble.

[0009] Optionally, the glue inlet is located on the side wall of the glue gun body, and the lowest point of the opening of the glue inlet in the glue cavity is lower than the lowest point of the opening of the glue inlet outside the glue gun body; the separating member is located below the glue inlet.

[0010] By adopting the above technical solution, the glue inlet is inclined downward towards the first cavity, so that the glue can enter the first cavity more smoothly.

[0011] Optionally, the separating member includes a mounting portion and an impact bearing portion, a channel is formed in the impact bearing portion, and a step or a groove is formed in the glue cavity to limit the mounting portion to a certain position or area.

[0012] By adopting the above technical solution, since the glue inlet is inclined downward towards the first cavity, when the glue enters the first cavity, the glue will impact the lower end of the thimble. Through the blocking of the impact bearing portion of the separating member, the impact of the glue on the thimble can be effectively reduced, and the mounting portion is used to fix the separating member.

[0013] Optionally, a third cavity is provided in the glue gun body, one end of the thimble is located in the third cavity, a piston is provided in the third cavity, the piston can move along the third cavity, the piston is fixedly connected to the thimble, and the third cavity is communicated with a first flow channel and a second flow channel, and the first flow channel and the second flow channel are respectively located on both sides of the piston.

[0014] By adopting the above technical solution, when gas or liquid is introduced into the second flow channel, the piston is subjected to an upward lifting force and can drive the thimble to move upward, and the thimble disengages from the glue outlet, and the glue outlet is opened; when gas or liquid is introduced into the first flow channel, the piston is subjected to a downward lifting force and can drive the thimble to move downward, and the thimble plugs the glue outlet.

[0015] Optionally, the piston includes at least two plate members sleeved on the head of the thimble, at least two gaskets are provided between adjacent two plate members, and a curled edge is provided at the edge of the gasket, and the curled edge surrounds the side peripheral wall of the plate member.

[0016] By adopting the above technical solution, when the curled edge is subjected to gas or liquid pressure, the curled edge will expand outward, so that the curled edge abuts against the inner wall of the third cavity, thus increasing the airtightness of the piston.

[0017] Optionally, the head of the thimble is threadedly connected with a tightening bolt, and the plate member is pressed by the thimble and the tightening bolt. The glue gun body is threadedly connected with an adjusting bolt, and a spring is arranged between the adjusting bolt and the tightening bolt. The acting force exerted by the spring on the thimble is along the length direction of the thimble.

[0018] By adopting the above technical solution, the spring exerts a downward tightening force on the thimble, so that when the air supply is cut off, the thimble can block the glue outlet under the action of the spring to prevent the glue from flowing out.

[0019] Optionally, the glue gun body is provided with a spreading head, and the spreading head is provided with a glue application port communicating with the glue outlet. The glue application port includes at least two expansion surfaces and at least two scraping surfaces;

[0020] A direction coordinate is established along the length direction of the thimble. The plane where the coordinate axis is located intersects with the scraping surface, and the distances from all coordinate points of the intersection line to the coordinate axis are equal.

[0021] The expansion surface has two states:

[0022] State 1: The plane where the coordinate axis is located intersects with the expansion surface, and the distance from the coordinate points of the intersection line to the coordinate axis gradually increases along the coordinate axis direction;

[0023] State 2: The plane where the coordinate axis is located intersects with the expansion surface, and the distances from all coordinate points of the intersection line to the coordinate axis are equal.

[0024] By adopting the above technical solution, the direction perpendicular to the scraping surface is the moving direction of the glue application gun. In this way, during the glue application process, the scraping surface will scrape and level the glue, making the upper surface of the glue flat. The first state of the expansion surface enables the glue application port to expand outwards, increasing the volume of the glue and unloading part of the pressure when the glue is discharged.

[0025] A glue application device includes a retractable glue gun, a transfer bin, a quantitative transportation device, and a conveying pipeline for connecting an external glue supply device. The glue inlet of the glue gun and the conveying pipeline are both communicated with the internal flow channel of the transfer bin, and the quantitative transportation device quantitatively transports the glue liquid in the conveying pipeline to the glue inlet; the transfer bin is also provided with a pressure sensor for real-time monitoring of the pressure provided by the quantitative transportation device to the glue gun and a heating module for heating the glue in the transfer bin.

[0026] By adopting the above technical solution, the pressure and the amount of glue discharged from the glue gun are controlled by the quantitative transportation device, and the pressure of the glue discharged can be adjusted according to the different viscosities of the glue.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] Improve the uniform effect of the glue pressure during glue extrusion. The glue cavity is divided into a first cavity and a second cavity by a separating component, and the fluid flow area of the first cavity is larger than the sum of the fluid flow areas of all channels, which plays a role in reducing pressure, making the glue pressure distribution in the second cavity more uniform than that in the first cavity, and contributing to improving the glue application quality.

[0029] Enhance the stability of the ejector pin. The ejector pin penetrates the separating component. When the ejector pin is bent by impact, the separating component can provide a reaction force to resist deformation, have a supporting effect on the ejector pin, and improve the stability of the ejector pin during work.

[0030] Reduce the impact of the glue on the ejector pin. The impact-bearing part of the separating component can block the impact of the glue on the lower end of the ejector pin to protect the ejector pin, and the installation part is used to fix the separating component to ensure the stability of its overall structure. Brief Description of the Drawings

[0031] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present application;

[0032] Figure 2 is the present application Figure 1 the A-A sectional view;

[0033] Figure 3 is the overall structural schematic diagram inside the glue gun body in Embodiment 1 of the present application;

[0034] Figure 4 is the overall structural schematic diagram inside the third cavity in Embodiment 1 of the present application;

[0035] Figure 5 is the overall structural schematic diagram inside the glue gun body in Embodiment 1 of the present application, different from Figure 3 in that unnecessary reference numerals are omitted;

[0036] Figure 6 is the overall structural schematic diagram of the separating component in Embodiment 1 of the present application;

[0037] Figure 7 is the overall structural schematic diagram of the spreading head in Embodiment 1 of the present application;

[0038] Figure 8 is the overall structural schematic diagram of the first component / second component in the spreading head in Embodiment 1 of the present application;

[0039] Figure 9 is the overall structural schematic diagram of the glue gun body in Embodiment 2 of the present application;

[0040] Figure 10 is the overall structural schematic diagram of the separating component in Embodiment 3 of the present application;

[0041] Figure 11It is a schematic diagram of the overall structure of the separation component in Embodiment 4 of the present application;

[0042] Explanation of reference numerals: 1, glue gun body; 11, glue chamber; 111, first chamber; 1111, glue inlet; 112, second chamber; 1121, glue outlet; 113, installation part; 12, separation part; 121, channel; 122, support part; 123, impact bearing part; 13, thimble; 131, tightening bolt; 132, hole; 14, spreading head; 141, first component; 142, second component; 143, glue groove; 144, glue application port; 1441, scraping surface; 1442, expansion surface; 15, third chamber; 151, first flow channel; 152, second flow channel; 16, piston; 161, plate; 17, gasket; 171, upturned edge; 18, adjusting bolt; 181, spring; 191, upper block; 192, middle block; 193, lower block; 2, transfer bin; 21, pressure sensor; 22, heating module; 3, metering and transportation device; 4, conveying pipeline; 5, heating accessory. Detailed implementation manners

[0043] The present application will be further described in detail below with reference to the accompanying drawings.

[0044] An embodiment of the present application discloses a glue application device. Embodiment 1

[0045] Referring to Figure 1 、 One A glue application device includes a transfer bin 2, a metering and transportation device 3, a conveying pipeline 4 and a glue gun. The conveying pipeline 4 is externally connected to a glue supply machine and transports glue into the transfer bin 2. The metering and transportation device 3 applies flowing pressure to the glue in the transfer bin 2. The metering and transportation device 3 is a mechanical device that enables fluid to flow, pressurize or transport in systems such as pipelines, and specifically can be a gear pump, a piston pump, or a peristaltic pump. The glue input end of the glue gun is located on the side, and the glue output end of the transfer bin 2 is communicated with the glue input end of the glue gun, forcing the glue to flow towards the glue gun. The glue gun scrapes the transported glue on the surface of the glass. When applying glue to the glass, the glue gun is located above the glass and is substantially perpendicular to the glass surface. Substantially perpendicular means that the glue gun is perpendicular to the glass or the inclination angle between the glue gun and the glass is 80° - 90°.

[0046] During the transportation of glue, in order to make the transportation of glue smoother, a heating module 22 is added to the transfer bin 2. In this embodiment, the heating module 22 uses a heating rod. The transfer bin 2 is a metal block with a flow channel machined inside. The heating rod is inserted into the transfer bin 2, and the heating rod heats the metal block, and heats the glue through heat transfer; in order to facilitate the control of the pressure of the glue at the outlet of the glue gun, a pressure sensor 21 is connected to the glue flow channel in the transfer bin 2. The pressure sensor 21 is arranged in the flow channel after being pressurized by the quantitative transportation device 3. In this way, the output pressure of the quantitative transportation device 3 is adjusted according to the reading of the pressure sensor 21, so that the pressure of the glue gun for gluing is within the expected range.

[0047] Refer to Figure 2 , the glue gun includes a glue gun body 1, a heating accessory 5 and an applicator head 14. The applicator head 14 is installed at the bottom of the glue gun body 1. The glue gun body 1 is made by metal machining. The heating accessory 5 is closely attached to the glue gun body 1, and heats the glue in the glue gun body 1 through heat transfer, making the glue flow more smoothly.

[0048] Refer to Figure 3 , the glue gun body 1 includes an upper block 191, a middle block 192 and a lower block 193. The upper block 191 and the middle block 192 enclose a third cavity 15. The middle block 192 and the lower block 193 enclose a glue cavity 11. The heating accessory 5 is closely attached to the middle block 192. The side wall of the glue cavity 11 is provided with a glue inlet 1111 communicating with the glue output end of the transfer bin 2. The lowest point of the opening of the glue inlet 1111 in the glue cavity 11 is lower than the lowest point of the opening of the glue inlet 1111 outside the glue gun body 1; a separating component 12 is arranged in the glue cavity 11. The separating component 12 divides the glue cavity 11 into a first cavity 111 and a second cavity 112. The first cavity 111 is communicated with the glue inlet 1111, and the second cavity 112 is communicated with the glue outlet 1121; the middle block is provided with a through hole 132. One end of the through hole 132 is communicated with the glue cavity 11, and the other end is communicated with the third cavity 15. The glue gun body 1 is provided with a thimble 13 moving along the through hole 132. The thimble 13 penetrates through the through hole 132. The head of the thimble 13 is located in the third cavity 15, and the tail is located in the glue cavity 11. The tail of the thimble 13 penetrates through the separating component 12 and can extend to the glue outlet 1121. The joints of the through hole 132 with the glue cavity 11 and the joints of the through hole 132 with the third cavity 15 are both subjected to movable sealing treatment. A driving component for driving the thimble 13 to move is arranged in the third cavity 15.

[0049] Refer to Figure 4, the driving component includes a piston 16 fixedly connected to the head of the ejector pin 13. The head of the ejector pin 13 is provided with a stepped shaft, and two plate members 161 are sleeved on the stepped shaft. Two sealing gaskets 17 are provided between the two plate members 161. A flanging 171 is provided on the outer circle of the sealing gasket 17. The flangings 171 of the two sealing gaskets 17 face in opposite directions. The flanging 171 surrounds the side peripheral wall of the corresponding side plate member 161. The flanging 171 and the sealing gasket 17 are made of materials with high elasticity and wear resistance, and can maintain good deformation adaptability within a certain temperature range to fill the sealing gap. Specifically, it can be one of rubber, silica gel, and resin. When the flanging 171 is subjected to the acting force of air flow or liquid, the flanging 171 will expand and deform outward, so that the flanging 171 abuts against the inner wall of the third chamber 15, enhancing the sealing performance; before assembly, the top surface of the upper plate member 161 is 1-3 mm higher than the top surface of the head of the ejector pin 13. A threaded hole is provided in the head of the ejector pin 13, and the axial direction of the threaded hole is parallel to the axial direction of the ejector pin 13. A tightening bolt 131 is threadedly connected to the threaded hole. The plate member 161 and the sealing gasket 17 are fixed to the head of the ejector pin 13 by mutual extrusion through the stepped portion and the tightening bolt 131. The upper block 191 is threadedly connected with an adjusting bolt 18. The feeding direction of the adjusting bolt 18 faces the ejector pin 13. A spring 181 is provided between the adjusting bolt 18 and the tightening bolt 131. The spring 181 forces the ejector pin 13 to move towards the glue outlet. The third chamber 15 is communicated with a first flow channel 151 and a second flow channel 152. The first flow channel 151 and the second flow channel 152 are respectively arranged on both sides of the piston 16. Both the first flow channel 151 and the second flow channel 152 are externally connected to a gas source or a liquid source.

[0050] Reference Figure 5 , the bottom end of the middle block 192 is provided with a stepped hole, and the top end of the lower block 193 is provided with an annular protrusion. The stepped hole is inserted into the annular protrusion. The step of the stepped hole and the annular protrusion enclose an installation ring groove. The installation part 113 of the separating component 12 is fitted in the installation ring groove. One end of the separating component 12 abuts against the stepped end face of the stepped hole, and the other end abuts against the annular protrusion of the lower block 193. The middle block and the lower block are fixed by bolts. The first chamber 111 is above the separating component 12, and the second chamber 112 is below the separating component 12.

[0051] Reference Figure 6, The partition member 12 is a member that obstructs the flow of liquid and divides the space in the glue cavity 11 into two parts. The shape of the partition member 12 can be flat, cylindrical, or reticular. A perforation is provided at the center position of the partition member 12, and the tail of the ejector pin 13 penetrates through the perforation. The inner wall of the perforation is the supporting portion 122. When the ejector pin 13 is bent by the impact of the glue, the ejector pin 13 will abut against the inner wall of the perforation, providing a support point for the ejector pin 13 and preventing the ejector pin 13 from deforming further under the impact of the glue. The partition member 12 is provided with an impact bearing portion 123. The impact bearing portion 123 is the surface portion of the partition member 12 facing the first cavity 111. The glue enters the first cavity 111 obliquely downward, and the glue contacts the impact bearing portion 123. Since the glue inlet 1111 faces the impact bearing portion 123, the impact bearing portion 123 can absorb part of the impact force of the glue; the impact bearing portion 123 is provided with a plurality of channels 121. The direction of the center line of the channels 121 is parallel to the ejector pin 13. The channels 121 refer to the transportation paths that can guide the liquid to flow in a predetermined direction. The cross-sectional shape of the channels 121 can be circular, rectangular, or polygonal. The fluid flow area of the first cavity 111 is greater than the sum of the fluid flow areas of all the channels 121. The distribution of the channels 121 on the partition member 12 can be diverse. In this embodiment, an example is given where they are evenly distributed in a ring on the partition member 12.

[0052] Reference Figure 7 and Figure 8 , The spreading head 14 is fixed to the bottom of the glue gun by bolts. The spreading head 14 includes a first component 141 and a second component 142. The first component 141 and the second component 142 are provided with transverse bolt holes and longitudinal bolt holes. The transverse bolt holes provide a transverse tension force for splicing the first component 141 and the second component 142. The longitudinal bolts are used to fix the spreading head 14 to the lower end of the glue gun. Glue grooves 143 are provided on the contact surfaces of both the first component 141 and the second component 142. The glue grooves 143 form the glue outlet 144, and the glue outlet 144 is communicated with the glue outlet 1121.

[0053] In this embodiment, the glue outlet 144 includes two expansion surfaces 1442 and two scraping surfaces 1441. A direction coordinate is established along the direction from the head to the bottom of the ejector pin 13. The plane where the coordinate axis is located intersects with the scraping surface 1441, and the distances from all the coordinate points on the intersection line to the coordinate axis are equal.

[0054] A direction coordinate is established along the length direction of the ejector pin 13. The plane where the coordinate axis is located intersects with the scraping surface 1441, and the distances from all the coordinate points on the intersection line to the coordinate axis are equal.

[0055] The expansion surface 1442 has at least two parts:

[0056] Part one: The plane where the coordinate axis is located intersects with the expansion surface 1442, and the distances from the coordinate points on the intersection line to the coordinate axis gradually increase along the coordinate axis direction;

[0057] Part two: The plane where the coordinate axes are located intersects with the extended surface 1442, and the distances from all coordinate points on the intersection line to the coordinate axes are equal.

[0058] The implementation principle of this embodiment is as follows: The glue supply machine transports glue to the transfer bin 2 through the transport pipeline 4. The quantitative transport device 3 provides pressure to the glue in the transfer bin 2 and drives the glue to flow into the glue gun. During the flow of the glue, in order to make the glue flow more smoothly, it is heated by the heating module 22, and the pressure sensor 21 is provided to check the pressure when the glue flows. The glue pressure is adjusted by adjusting the quantitative transport device 3. The glue enters the first chamber 111 through the glue inlet 1111. The impact bearing part 123 of the separating part 12 will unload most of the glue, reducing the impact of the glue on the ejector pin 13. Secondly, the part of the ejector pin 13 in the first chamber 111 is supported by two points of the separating part 12 and the top wall of the first chamber 111, so that the part of the ejector pin 13 in the first chamber has a reaction force to resist deformation. The glue flows through the channel 121 to the second chamber 112. The diversion and pressure reduction of the glue through the channel 121 improve the uniformity of the glue pressure distribution in the second chamber 112. The ejector pin 13 can move up and down by receiving driving forces from different directions through the piston 17. When the ejector pin 13 moves upward to separate from the glue outlet 1121, the glue can flow from the glue outlet 1121 to the spreading head 14. When the ejector pin 13 moves downward to block the glue outlet 1121, the glue outlet 1121 is closed. The direction perpendicular to the scraping surface is the moving direction of the glue gun. In this way, during the glue coating process, the scraping surface will scrape and smooth the glue, making the upper surface of the glue flat. Embodiment 2

[0059] Refer to Figure 9 , different from Embodiment 1, the separating part 12 and the glue gun body 1 are cast as one. In order to facilitate casting, the middle block 192 is split into two pieces, which is convenient for casting. Embodiment 3

[0060] Refer to Figure 10 , different from Embodiment 1, the impact bearing part 123 of the separating part 12 is recessed downward, and a perforation is provided at the center of the recess. The ejector pin 13 passes through the perforation. The channel 121 is designed at the bottom and side of the recessed surface. When the glue enters the glue chamber 11 obliquely downward, since the impact bearing part 123 is recessed downward, when the glue impacts the recess, the impact bearing part 123 can better guide the flow of the glue and disperse the impact force of the water flow in different directions. Embodiment 4

[0061] Refer to Figure 11, different from Embodiment 1, the impact-bearing portion 123 of the separating member 12 bulges upward, and the side surface of the bulge mainly bears the impact of the glue. The ejector pin 13 penetrates through the center position of the bulge. When the glue enters the first cavity 111, the side surface of the bulge bears the impact of the glue, reducing the impact of the glue on the ejector pin 13.

[0062] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A glue gun, characterized in that: It includes a glue gun body (1). Inside the glue gun body (1), there is a glue chamber (11), a glue inlet (1111), and a glue outlet (1121). The glue chamber (11) is provided with a separating component (12). The separating component (12) divides the glue chamber (11) into a first chamber (111) and a second chamber (112). The first chamber (111) is communicated with the glue inlet (1111), and the second chamber (112) is communicated with the glue outlet (1121). The separating component (12) is provided with at least two channels (121) that communicate the first chamber (111) and the second chamber (112). The fluid flow area of the first chamber (111) is greater than the sum of the fluid flow areas of all the channels (121).

2. The glue gun according to claim 1, characterized in that: The glue gun body (1) is provided with a thimble (13). The thimble (13) passes through the glue chamber (11) and penetrates the separating component (12). The thimble (13) can close or open the glue outlet (1121) by moving relative to the glue gun body (1).

3. The glue gun according to claim 2, wherein: The glue inlet (1111) is located on the side wall of the glue gun body (1). The lowest point of the opening of the glue inlet (1111) inside the glue chamber (11) is lower than the lowest point of the opening of the glue inlet (1111) outside the glue gun body (1); the separating component (12) is located below the glue inlet (1111).

4. The glue gun according to claim 3, characterized in that: The separating component (12) includes a mounting part (113) and an impact bearing part (123). The channels (121) are opened on the impact bearing part (123). A step or groove is opened in the glue chamber (11) to limit the mounting part (113) to a certain position or area.

5. The glue gun according to claim 2, characterized in that: A third chamber (15) is provided inside the glue gun body (1). One end of the thimble (13) is located in the third chamber (15). The third chamber (15) is provided with a piston (16). The piston (16) can move along the third chamber (15). The piston (16) is fixedly connected to the thimble (13). The third chamber (15) is communicated with a first flow channel (151) and a second flow channel (152). The first flow channel (151) and the second flow channel (152) are respectively located on both sides of the piston (16).

6. The glue gun according to claim 5, wherein: The piston (16) includes at least two plate members (161) sleeved on the thimble (13). At least two sealing gaskets (17) are provided between adjacent two plate members (161). A curled edge (171) is provided at the edge of the sealing gasket (17). The curled edge (171) surrounds the side peripheral wall of the plate member (161).

7. The glue gun according to claim 6, characterized in that: The thimble (13) is threadedly connected with a fastening bolt (131). The plate member (161) and the sealing gasket (17) are mutually pressed and fixed at the end of the thimble (13) through the thimble (13) and the fastening bolt (131).

8. The glue gun according to claim 7, characterized in that: The glue gun body (1) is threadedly connected with an adjusting bolt (18). The movement feeding direction of the adjusting bolt (18) is towards the thimble (13). A spring (181) is provided between the adjusting bolt (18) and the fastening bolt (131). The spring (181) forces the thimble (13) to move towards the glue outlet (1121).

9. The glue gun according to claim 2, wherein: The glue gun body (1) is provided with a spreading head (14), and the spreading head (14) is provided with a glue application port (144) communicating with the glue outlet (1121). The glue application port (144) includes at least two extension surfaces (1442) and at least two scraping surfaces (1441). A direction coordinate is established along the length direction of the thimble (13). The plane where the coordinate axis is located intersects with the scraping surface (1441), and the distances from all coordinate points of the intersection line to the coordinate axis are equal. The extension surface (1442) has at least two parts: Part 1: The plane where the coordinate axis is located intersects with the extension surface (1442), and the distance from the coordinate point of the intersection line to the coordinate axis gradually increases along the coordinate axis direction. Part 2: The plane where the coordinate axis is located intersects with the extension surface (1442), and the distances from all coordinate points of the intersection line to the coordinate axis are equal.

10. A gluing device, characterized in that: The glue gun including any one of the above claims 1-9 further includes a transfer bin (2), a quantitative transportation device (3), and a conveying pipeline (4) for connecting to an external glue supply device. The glue inlet (1111) of the glue gun and the conveying pipeline (4) are both communicated with the internal flow channel of the transfer bin (2). The quantitative transportation device (3) quantitatively transports the glue liquid in the conveying pipeline (4) to the glue inlet (1111); the transfer bin (2) is further provided with a pressure sensor (21) for real-time monitoring of the pressure provided by the quantitative transportation device (3) to the glue gun and a heating module (22) for heating the glue in the transfer bin (2).

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