Dispensing device

Abstract

A glue dispensing device includes a rubber hose and an air plug assembly. The rubber hose includes a accommodating cavity and a glue outlet; the air plug assembly is accommodated in the accommodating cavity, and the air plug assembly divides the accommodating cavity into a first cavity and a second cavity, the second cavity being connected to the glue outlet; the air plug assembly includes a rubber plug and an air plug, the outer wall of the rubber plug slides against the inner wall of the rubber hose, the end of the air plug facing away from the glue outlet is accommodated in the first cavity, and the end of the air plug close to the glue outlet passes through the rubber plug and extends into the second cavity, and the air plug is used to reciprocate toward or away from the glue outlet relative to the rubber plug under air pressure control, so as to connect or isolate the first cavity from the second cavity. The glue dispensing device provided by the present invention can achieve precise control of the glue output and rapid glue reabsorption by arranging the air plug assembly in the rubber hose.

Description

Technical Field

[0001] The present invention relates to the technical field of glue coating equipment, in particular to a glue dispensing device. Background Art

[0002] The pneumatic dispensing device currently used in production includes a hose, a rubber plug arranged in the hose, and a glue needle arranged at the glue outlet of the hose. When in use, the gas-compressed rubber plug is controlled by the dispensing controller to move in the hose, thereby pushing the glue to be sprayed out by the glue needle for dispensing.

[0003] However, the tolerance between the plug and the hose of the traditional pneumatic dispensing device is poor, resulting in a large amount of glue residue on the hose wall, causing glue waste; moreover, during production, the plug will cause resistance to the vacuum suction of the dispensing controller, resulting in the glue remaining in the glue needle at the head of the hose being difficult to quickly suck back, and the glue remaining in the glue needle can be easily thrown out during the rapid movement of the dispensing device, resulting in poor process. Summary of the Invention

[0004] In view of this, in order to overcome at least one of the above defects, it is necessary to provide a dispensing device.

[0005] The present invention provides a glue dispensing device, comprising a rubber hose and an air plug assembly. The rubber hose comprises a receiving cavity and a glue outlet communicated with the receiving cavity; the air plug assembly is accommodated in the receiving cavity, the air plug assembly divides the receiving cavity into a first cavity and a second cavity, the second cavity being communicated with the glue outlet; the air plug assembly comprises a rubber plug and an air plug, the outer wall of the rubber plug slidably abuts against the inner wall of the rubber hose, the rubber plug comprises a through hole, an end of the air plug facing away from the glue outlet is accommodated in the first cavity, and an end of the air plug proximal to the glue outlet passes through the through hole and extends into the second cavity, the air plug being configured to reciprocate toward or away from the glue outlet relative to the rubber plug under air pressure control, thereby connecting or isolating the first cavity from the second cavity.

[0006] In some possible embodiments, the air plug includes a telescopic rod, wherein the end of the telescopic rod facing away from the glue outlet is accommodated in the first cavity, and the end of the telescopic rod near the glue outlet is disposed through the rubber plug. The telescopic rod is a hollow structure, and the end of the telescopic rod near the rubber plug is provided with a first vent hole, which is connected to the first cavity through the hollow structure of the telescopic rod. The telescopic rod is configured to reciprocate relative to the rubber plug toward or away from the glue outlet so that the first vent hole is in a first position or a second position. When in the first position, the first vent hole contacts the side wall of the through hole, thereby isolating the first cavity from the second cavity; when in the second position, the first vent hole is connected to the second cavity, thereby connecting the first cavity to the second cavity.

[0007] In some possible embodiments, the air plug includes a telescopic rod, which includes a fixed part, a telescopic part and a plug body, the plug body is provided at one end of the telescopic part close to the glue outlet, and the fixed part is provided at the end of the telescopic rod away from the plug body, the rubber plug includes a through hole, along the moving direction perpendicular to the telescopic rod, the size of the plug body is equal to the size of the through hole, and the size of the telescopic part is smaller than the size of the through hole; the telescopic part is used to reciprocate toward or away from the glue outlet relative to the rubber plug so that the plug body is located in the through hole or in the second cavity; wherein, when the plug body is located in the through hole, the first cavity is separated from the second cavity; when the plug body is located in the second cavity, part of the telescopic part is located in the through hole so that the first cavity is connected to the second cavity.

[0008] In some possible implementations, the air plug further includes a plug head disposed at an end of the telescopic rod facing away from the air pressure control assembly, and the plug head is accommodated in the second cavity.

[0009] In some possible implementations, along an extension direction perpendicular to the telescopic rod, a size of the plug is larger than a size of the through hole.

[0010] In some possible embodiments, a second ventilation hole is further provided on the telescopic rod, and the second ventilation hole is located on a side of the first ventilation hole close to the first cavity, and the second ventilation hole is connected to the hollow structure of the telescopic rod, wherein when the first ventilation hole is in the first position or the second position, the second ventilation hole is in conflict with the side wall of the through hole.

[0011] In some possible implementations, a third vent hole is further provided on the telescopic rod, and the hollow structure of the telescopic rod is connected to the first cavity through the third vent hole.

[0012] In some possible embodiments, the telescopic rod includes a fixed part and a telescopic part sleeved on the fixed part, the hollow structure of the telescopic rod passes through the fixed part and the telescopic part, the fixed part is accommodated in the first cavity, and one end of the telescopic part away from the fixed part passes through the through hole, and the telescopic part is used to move back and forth toward or away from the glue outlet relative to the fixed part.

[0013] In some possible implementations, a limiting block is provided on the fixing portion.

[0014] In some possible embodiments, the dispensing device further includes an air pressure control assembly, which includes an air pressure controller and an air pipe connected to the air pressure controller, and an end of the air pipe facing away from the air pressure controller extends into the first cavity.

[0015] Compared with the prior art, the glue dispensing device provided by the present invention has a simple structure and is easy to assemble and disassemble. By arranging an air plug assembly in the rubber hose, pneumatically controlled glue dispensing and glue return can be achieved. The overall movement of the air plug assembly is the basic auxiliary control of the glue output. At the same time, the glue output is precisely controlled by controlling the air pressure entering the second cavity, thereby improving the control accuracy of the glue output during the glue dispensing process. When the glue is sucked back, the second cavity is quickly vacuumed by the reverse exhaust of the air plug assembly, thereby achieving rapid glue sucking back. The glue sucking back is carried out synchronously with the exhaust instruction, and the reaction speed is fast. There is no need to set a separate sucking back control instruction, which greatly improves the glue sucking back speed and avoids glue remaining at the glue outlet after the glue dispensing is completed, causing glue dripping and affecting the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a dispensing device provided in one embodiment of the present invention.

[0017] Figure 2 It is a structural schematic diagram of an inflation plug assembly provided by one embodiment of the present invention when the first vent hole is located at a first position.

[0018] Figure 3 It is a structural schematic diagram of an inflation plug assembly provided by one embodiment of the present invention when the first vent hole is located at the second position.

[0019] Figure 4 It is a structural schematic diagram of an inflation plug assembly provided by another embodiment of the present invention when the plug body is in a first position.

[0020] Figure 5 It is a structural schematic diagram of an inflation plug assembly provided in another embodiment of the present invention when the plug body is in the second position.

[0021] Description of main component symbols

[0022]

[0023]

[0024] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0027] The system implementation described below is merely illustrative. The module or circuit divisions described represent only a logical functional division; actual implementations may employ different divisions. Furthermore, it is clear that the term "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in system claims may also be implemented by the same unit or device through software or hardware. Terms such as "first" and "second" are used to designate names and do not imply any particular order.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] See also Figures 1 to 3An embodiment of the present invention provides a glue dispensing device 1000, comprising a rubber hose 1, an inflation plug assembly 2, a glue needle 3, and a top cover 4. The rubber hose 1 includes a glue outlet 12, and the glue needle 3 is disposed at the glue outlet 12. The top cover 4 and the rubber hose 1 together form a receiving cavity 11, and the glue needle 3 is in communication with the receiving cavity 11. The inflation plug assembly 2 is received in the receiving cavity 11, dividing the receiving cavity 11 into a first cavity 111 and a second cavity 112, wherein the second cavity 112 is in communication with the glue needle 3. The inflation plug assembly 2 includes a rubber plug 21 and an air plug 22. The outer wall of the rubber plug 21 slides against the inner wall of the rubber tube 1. The end of the air plug 22 facing away from the glue outlet 12 is housed in the first cavity 111 and connected to the top cover 4. The end of the air plug 22 near the glue outlet 12 passes through the rubber plug 21 and extends into the second cavity 112. The air plug 22 is configured to reciprocate toward or away from the glue outlet 12 relative to the rubber plug 21 under the action of air pressure, thereby connecting or disconnecting the first cavity 111 from the second cavity 112. The second cavity 112 is configured to accommodate glue.

[0030] Air pressure is introduced into the first cavity 111, which pushes the entire inflatable plug assembly 2 toward the glue outlet 12. Simultaneously, it pushes the air plug 22 relative to the rubber plug 21 toward the glue outlet 12, thereby connecting the first cavity 111 with the second cavity 112. Air pressure enters the second cavity 112 and pushes the glue out of the glue outlet 12, thereby achieving glue dispensing. After glue dispensing is completed, the pressure in the first cavity 111 is exhausted, and the air plug 22 moves away from the glue outlet 12, creating a vacuum in the second cavity 112. At this point, the external air pressure pushes the glue at the glue outlet 12 into the second cavity 112, achieving glue reabsorption.

[0031] See also Figure 2 The rubber plug 21 also includes a through hole 23, and the air plug 22 is arranged to pass through the through hole 23. The outer wall of the air plug 22 conflicts with the side wall of the through hole 23. At the same time, the air plug 22 can move toward or away from the glue outlet 12 relative to the rubber plug 21 in the through hole 23.

[0032] See also Figure 2 and Figure 3, the air plug 22 includes a telescopic rod 221, the end of the telescopic rod 221 away from the glue outlet 12 is accommodated in the first cavity 111 and is connected to the top cover 4, the end of the telescopic rod 221 close to the glue outlet 12 is arranged to pass through the through hole 23, and the outer wall of the telescopic rod 221 conflicts with the side wall of the through hole 23. The telescopic rod 221 includes a hollow structure 226, and the end of the telescopic rod 221 close to the rubber plug 21 is provided with a first air vent 223, and the first air vent 223 is connected to the first cavity 111 through the hollow structure 226 of the telescopic rod 221. The telescopic rod 221 is used to reciprocate toward or away from the glue outlet 12 relative to the rubber plug 21, so that the first air vent 223 is in the first position or the second position. Wherein, as Figure 2 As shown, when in the first position, the first vent hole 223 contacts the rubber plug 21 to separate the first cavity 111 from the second cavity 112; Figure 3 As shown, when in the second position, the first vent hole 223 is connected to the second cavity 112 , so that the first cavity 111 is connected to the second cavity 112 through the hollow structure 226 of the telescopic rod 221 and the first vent hole 223 .

[0033] In this embodiment, along a direction a perpendicular to the extension of the telescopic rod 221, dimension c of the telescopic rod 221 is equal to or slightly larger than dimension b of the through hole 23. Because the rubber plug 21 is elastic, dimension b of the through hole 23 is designed to be slightly smaller than dimension c of the telescopic rod 221. This ensures an interference fit between the rubber plug 21 and the telescopic rod 221, ensuring airtightness.

[0034] See also Figure 2 and Figure 3 The air plug 22 also includes a plug 222 located at one end of the telescopic rod 221 near the glue outlet 12. The plug 222 is housed within the second cavity 112 and, along a direction a perpendicular to the extension of the hose 1, is larger than the through-hole 23. The provision of the plug 222 enhances the airtightness of the telescopic rod 221 when in the first position, ensuring complete isolation between the first cavity 111 and the second cavity 112. The plug 222 also prevents the rubber plug 21 from falling out during movement of the telescopic rod 221 away from the glue outlet 12.

[0035] In this embodiment, along the extension direction a perpendicular to the hose 1 , the size d of the plug 222 is slightly smaller than the inner diameter of the hose 1 . This design prevents glue from accidentally entering the first vent 223 during the back-sucking process, thereby preventing the air plug 22 from being blocked.

[0036] See also Figure 2 and Figure 3 The telescopic rod 221 is further provided with a second vent hole 224. The second vent hole 224 is located on a side of the first vent hole 223 that is closer to the first cavity 111. The second vent hole 224 is in communication with the hollow structure 226 of the telescopic rod 221. When the first vent hole 223 is in the first position or the second position, the second vent hole 224 abuts against the inner wall of the through hole 23. By designing the second vent hole 224, a force perpendicular to the extension direction a can be applied to the plug 21, thereby causing the plug 21 to tightly abut against the side wall of the hose 1, preventing glue from entering the first cavity 111 during the movement of the plug 21 relative to the hose 1. At the same time, the plug 21 can better remove glue adhering to the inner wall of the hose 1, thereby avoiding glue waste.

[0037] See also Figure 2 and Figure 3 The telescopic rod 221 is further provided with a third vent hole 225 , and the third vent hole 225 is used to achieve communication between the hollow structure 226 of the telescopic rod 221 and the first cavity 111 .

[0038] See also Figure 2 and Figure 3 The telescopic rod 221 includes a fixed portion 2211 and a telescopic portion 2212 sleeved on the fixed portion 2211. The hollow structure 226 of the telescopic rod 221 passes through the fixed portion 2211 and the telescopic portion 2212. The fixed portion 2211 passes through and is fixed to the top cover 4. The fixed portion 2211 is in communication with the air pressure controller 51. The end of the telescopic portion 2212 facing away from the fixed portion 2211 passes through the rubber plug 21. The first vent hole 223 and the second vent hole 224 are both provided at the end of the telescopic portion 2212 near the rubber plug 21. The telescopic portion 2212 is configured to reciprocate relative to the fixed portion 2211 toward or away from the rubber outlet 12.

[0039] In this embodiment, a stopper 2213 is provided on the fixing portion 2211. The stopper 2213 is used to limit the distance that the rubber plug 21 moves away from the glue outlet 12 during the air extraction process, thereby preventing the rubber plug 21 from pushing open the top cover 4 during the air extraction process. In addition, the glue can be sucked back into the second cavity 112 by the glue needle 3. The suction path does not need to be too large, otherwise the glue will have a long travel distance during the next glue dispensing, affecting the glue dispensing efficiency. At the same time, it also prevents outside air from entering the second cavity 112 and affecting the glue quality.

[0040] See also Figure 1In this embodiment, the glue needle 3 is detachably arranged at the glue outlet 12, and different glue needles 3 can be replaced according to actual glue dispensing requirements, which makes glue dispensing more flexible.

[0041] See also Figure 1 In this embodiment, the top cover 4 is detachably provided at the opening of the hose 1 .

[0042] See also Figure 1 The dispensing device 1000 further includes an air pressure control assembly 5, which includes an air pressure controller 51 and an air pipe 52 connected to the air pressure controller 51. The end of the air pipe 52, which is away from the air pressure controller 51, extends into the first cavity 111, and ventilation or exhaust is controlled by the air pressure controller 51. By setting the ventilation and exhaust programs of the air pressure controller 51, automatic dispensing and back-sucking processes can be achieved. The glue back-sucking process does not require separate program instructions, has a fast response speed, and can achieve rapid back-sucking.

[0043] See also Figure 1 The dispensing device 1000 further includes a fixing frame 6, and the rubber hose 1 is fixed on the fixing frame 6 to prevent the rubber hose 1 from shaking during the dispensing process, thereby preventing poor dispensing.

[0044] See also Figures 1 to 3 When the dispensing device 1000 is in use, air pressure is injected into the first cavity 111 through the air pressure control component 5 via the telescopic rod 221 or directly, and the air pressure pushes the inflatable plug component 2 as a whole to move toward the glue outlet 12, and at the same time pushes the telescopic rod 221 to move relative to the rubber plug 21 toward the glue outlet 12, so that the first cavity 111 is connected to the second cavity 112 through the hollow structure 226 of the telescopic rod 221 and the first vent 223, and the air pressure enters the second cavity 112 through the hollow structure of the telescopic rod 221 and the first vent 223 and pushes the glue to be sprayed out from the glue outlet 12, so as to achieve dispensing, as shown in FIG. Figure 3As shown. During the dispensing process, the overall movement of the inflation plug assembly 2 is the basic auxiliary control for the glue output. At the same time, the air pressure entering the second cavity 112 through the telescopic rod 221 and the first air vent 223 is used to accurately control the glue output, thereby improving the control accuracy of the glue output during the dispensing process. After the dispensing is completed, the pressure in the first cavity 111 is discharged, and the air pressure in the first cavity 111 is reduced. At this time, the gas in the second cavity 112 is reversely extracted through the hollow structure of the telescopic rod 221 and the first air vent 223. At the same time, the reverse air pressure pushes the telescopic rod 221 to move away from the glue outlet 12, separating the first cavity 111 and the second cavity 112, so that the second cavity 112 is in a vacuum state. At this time, the external air pressure will push the glue at the glue outlet 12 to move in the opposite direction to the second cavity 112, thereby realizing the back suction of the glue, as shown in FIG. Figure 2 When the glue is sucked back, the reverse exhaust of the inflatable plug assembly 2 quickly makes the second cavity 112 in a vacuum state, thereby achieving rapid glue sucking back. The glue sucking back and the exhaust command are carried out synchronously, with a fast reaction speed. There is no need to set a separate sucking back control command, which greatly improves the glue sucking back speed and avoids glue residue in the glue outlet 12 after dispensing, causing glue dripping and affecting product yield.

[0045] A dispensing device 1000 provided in an embodiment of the present invention is suitable for the assembly and installation of camera module components, the bonding and assembly of various components of electronic products, the bonding of circuit boards and small resistors, the improvement of the electrical properties of camera modules, the insulation isolation between various conductors, the power isolation protection of daily household appliances, the repair of damage to airbags, the fixation of electronic screens and supporting structures, the bonding and fixation of various daily necessities such as shoes and umbrellas, etc.

[0046] See also Figure 4 and Figure 5 In another embodiment, the telescopic rod 227 includes a plug body 2271, a telescopic portion 2272 connected to one end of the plug body 2271 close to the first cavity 111, and a fixing portion 2273 provided at one end of the telescopic portion 2272 away from the plug body 2231, and the fixing portion 2273 is fixed to the top cover 4. Along the other direction perpendicular to the extension direction a, the dimension e of the plug body 2271 is substantially equal to the dimension b of the through hole 23, and the dimension e of the plug body 2271 is larger than the dimension f of the telescopic portion 2272. Driven by the telescopic portion 2272, the plug body 2231 can reciprocate along the extension direction a in the through hole 23, so that the plug body 2271 is in the first position and the second position. Figure 4 As mentioned above, when the plug body 2271 is in the first position, the plug body 2271 is located in the through hole 23. At this time, the first cavity 111 and the second cavity 112 are separated. Figure 5As shown, when the plug body 2271 is in the second position, that is, the plug body 2271 is in the second cavity 112, and part of the telescopic portion 2272 is in the through hole 23, at this time, since the size f of the telescopic portion 2272 is smaller than the size b of the through hole 23, the gas in the first cavity 111 will enter the second cavity 112 from the gap between the telescopic portion 2272 and the side wall of the through hole 23, thereby pushing the glue in the second cavity 112 to flow out from the glue outlet 12.

[0047] See also Figure 1 , Figure 4 and Figure 5 When the dispensing device 1000 is in use, air pressure is directly injected into the first cavity 111 through the air pressure control component 5. The air pressure pushes the entire inflatable plug component 2 toward the glue outlet 12. At the same time, it pushes the telescopic rod 227 relative to the rubber plug 21 toward the glue outlet 12, so that the plug body 2271 moves from the through hole 23 to the second cavity 112, so that the first cavity 111 is connected with the second cavity 112 through the through hole 23. The gas enters the second cavity 112 through the through hole 23 and pushes the glue to be ejected from the glue outlet 12 to achieve dispensing. Figure 5 As shown. During the dispensing process, the overall movement of the inflation plug assembly 2 is the basic auxiliary control for the glue output. At the same time, the air pressure entering the second cavity 112 is controlled by the size of the gap between the telescopic part 2272 and the through hole 23, thereby accurately controlling the glue output and improving the control accuracy of the glue output during the dispensing process. After the dispensing is completed, the pressure in the first cavity 111 is discharged, and the air pressure in the first cavity 111 is reduced. At this time, the gas in the second cavity 112 is reversely extracted through the through hole 23. At the same time, the reverse air pressure pushes the telescopic part 2272 to drive the plug body 2271 away from the glue outlet 12, separating the first cavity 111 and the second cavity 112, so that the second cavity 112 is in a vacuum state. At this time, the external air pressure will push the glue at the glue outlet 12 to move in the opposite direction to the second cavity 112, realizing the back suction of the glue, as shown in FIG. Figure 4 When the glue is sucked back, the reverse exhaust of the inflatable plug assembly 2 quickly makes the second cavity 112 in a vacuum state, thereby achieving rapid glue sucking back. The glue sucking back and the exhaust command are carried out synchronously, with a fast reaction speed. There is no need to set a separate sucking back control command, which greatly improves the glue sucking back speed and avoids glue residue in the glue outlet 12 after dispensing, causing glue dripping and affecting product yield.

[0048] Compared with the prior art, the glue dispensing device 1000 provided by the present invention has a simple structure and is easy to assemble and disassemble. By arranging an air plug assembly 2 in the rubber hose 1, pneumatically controlled glue dispensing and glue return can be achieved. The overall movement of the air plug assembly 2 is the basic auxiliary control of the glue output. At the same time, the glue output is precisely controlled by controlling the air pressure entering the second cavity 112, thereby improving the control accuracy of the glue output during the glue dispensing process. When the glue is sucked back, the second cavity 112 is quickly vacuumed by the reverse exhaust of the air plug assembly 2, thereby achieving rapid glue sucking back. The glue sucking back is carried out synchronously with the exhaust instruction, and the reaction speed is fast. There is no need to set a sucking back control instruction separately, which greatly improves the glue sucking back speed and avoids glue remaining at the glue outlet 12 after the glue dispensing is completed, causing glue dripping and affecting the product yield. The air plug assembly has a long service life and is easy to replace.

Claims

1. A dispensing device, characterized in that: include: A rubber hose, comprising a receiving cavity and a rubber outlet, wherein the receiving cavity is in communication with the rubber outlet; and An inflation plug assembly is accommodated in the accommodating cavity, and the inflation plug assembly divides the accommodating cavity into a first cavity and a second cavity, the second cavity is connected to the glue outlet, the inflation plug assembly includes a rubber plug and an air plug, the outer wall of the rubber plug slides against the inner wall of the rubber tube, the rubber plug includes a through hole, the end of the air plug away from the glue outlet is accommodated in the first cavity, the end of the air plug close to the glue outlet passes through the through hole and extends into the second cavity, the air plug is used to move back and forth toward or away from the glue outlet relative to the rubber plug under air pressure control, so that the first cavity and the second cavity are connected or separated.

2. The dispensing device according to claim 1, characterized in that: The air plug includes a telescopic rod, an end of the telescopic rod facing away from the glue outlet is accommodated in the first cavity, and an end of the telescopic rod near the glue outlet is arranged to pass through the rubber plug. The telescopic rod is a hollow structure, and an end of the telescopic rod near the rubber plug is provided with a first vent. The first vent is connected to the first cavity through the hollow structure of the telescopic rod. The telescopic rod is used to reciprocate toward or away from the glue outlet relative to the rubber plug so that the first vent is in the first position or the second position. Wherein, when in the first position, the first vent is in contact with the side wall of the through hole so as to separate the first cavity from the second cavity; when in the second position, the first vent is connected to the second cavity so as to connect the first cavity to the second cavity.

3. The dispensing device according to claim 1, characterized in that: The air plug includes a telescopic rod, the telescopic rod includes a fixed portion, a telescopic portion and a plug body, the plug body is provided at one end of the telescopic portion close to the glue outlet, the fixed portion is provided at one end of the telescopic rod away from the plug body, the rubber plug includes a through hole, along the moving direction perpendicular to the telescopic rod, the size of the plug body is equal to the size of the through hole, and the size of the telescopic portion is smaller than the size of the through hole; the telescopic portion is used to reciprocate toward or away from the glue outlet relative to the rubber plug so that the plug body is located in the through hole or in the second cavity, When the plug is located in the through hole, the first cavity is separated from the second cavity; when the plug is located in the second cavity, part of the telescopic part is located in the through hole, so that the first cavity is connected to the second cavity.

4. The dispensing device according to claim 2 or 3, characterized in that: The air plug further comprises a plug head provided at one end of the telescopic rod close to the glue outlet, and the plug head is accommodated in the second cavity.

5. The dispensing device according to claim 4, characterized in that: Along an extending direction perpendicular to the telescopic rod, a size of the plug is larger than a size of the through hole.

6. The dispensing device according to claim 2, characterized in that: The telescopic rod is also provided with a second ventilation hole, which is located on the side of the first ventilation hole close to the first cavity, and is connected to the hollow structure of the telescopic rod. When the first ventilation hole is in the first position or the second position, the second ventilation hole is in conflict with the side wall of the through hole.

7. The dispensing device according to claim 2, characterized in that: The telescopic rod is further provided with a third vent hole, and the hollow structure of the telescopic rod is connected with the first cavity through the third vent hole.

8. The dispensing device according to claim 2, characterized in that: The telescopic rod includes a fixed part and a telescopic part sleeved on the fixed part. The hollow structure of the telescopic rod passes through the fixed part and the telescopic part. The fixed part is accommodated in the first cavity. The end of the telescopic part away from the fixed part passes through the through hole. The telescopic part is used to reciprocate toward or away from the glue outlet relative to the fixed part.

9. The dispensing device according to claim 8, characterized in that: A limiting block is provided on the fixing portion.

10. The dispensing device according to claim 1, wherein: The dispensing device further includes an air pressure control component, which includes an air pressure controller and an air pipe connected to the air pressure controller, and an end of the air pipe facing away from the air pressure controller extends into the first cavity.

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