Hot melt adhesive dispensing device

Abstract

The invention discloses a hot melt adhesive dispensing device, comprising a glue cylinder with an open front end, a glue squeezing head arranged inside the glue cylinder, the glue squeezing head and the glue cylinder are in contact and sealed, the glue squeezing head divides the inside of the glue cylinder into a rear chamber and a front chamber, the glue squeezing head moves in the glue cylinder under the drive of the cylinder, a heating plate that can seal the open end of the glue cylinder and heat and melt the hot melt adhesive block is arranged just in front of the open end of the glue cylinder, the glue cylinder moves relative to the heating plate under the drive of the cylinder, and when the glue cylinder moves forward and presses against the heating plate, the heating plate just blocks the open end of the glue cylinder and closes the front chamber of the glue cylinder into a closed cavity, a glue dispensing channel that can connect the front chamber with the outside when the heating plate blocks the open end of the glue cylinder is arranged in the heating plate, and an exhaust mechanism that can discharge the gas in the front chamber to the outside during the glue application process is arranged on the upper part of the glue squeezing head. The advantages of the invention are: no bubbles will appear during the glue application process, and the glue application effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of hollow glass manufacturing equipment, and in particular to a hot melt adhesive dispensing device used for coating hot melt adhesive on aluminum spacers. Background Art

[0002] Insulating glass is a new type of building material that is good at heat insulation, sound insulation, beautiful and practical, and can reduce the weight of buildings. Insulating glass is a glass product with a dry gas space formed by two or more layers of flat glass evenly separated by aluminum spacers and sealed around the edges. The glue coating device is a common equipment for processing insulating glass. It is used to heat and melt hot melt glue (such as butyl glue) and evenly coat it on the aluminum spacers to facilitate the production of insulating glass.

[0003] The glue coating device requires a glue discharging device for heating and extruding the hot melt glue. The structure of a hot melt glue discharging device currently used includes: a glue cylinder with an open front end and a rear end cover at the rear end, a glue extrusion pressure head is arranged inside the glue cylinder, the glue extrusion pressure head is in sealing contact with the inner wall of the glue cylinder, the glue extrusion pressure head divides the inside of the glue cylinder into a relatively independent rear chamber and a front chamber for placing the hot melt glue block, the glue extrusion pressure head is driven by a first driving component to move back and forth in the glue cylinder, a heating plate that can seal the open end of the glue cylinder and heat and melt the hot melt glue block is arranged just in front of the open end of the glue cylinder, the glue cylinder is driven by a second driving component to move back and forth relative to the heating plate, and when the glue cylinder moves forward and presses against the heating plate, the heating plate just blocks the open end of the sealed glue cylinder, and the front chamber of the glue cylinder is closed as a closed cavity, a glue discharge channel connecting the front chamber with the outside is arranged in the heating plate, and the glue inlet of the glue discharge channel is located at the upper rear end surface of the heating plate. The working process is as follows: first, the first driving component drives the glue squeezing head to move backward until the front chamber can accommodate the hot-melt glue block, then the action of the first driving component is stopped, and then the hot-melt glue block is placed in the front chamber of the glue cylinder, and then the second driving component drives the glue cylinder to move forward and press against the heating plate. At this time, the heating plate just blocks the open end of the sealing glue cylinder, and the front chamber of the glue cylinder is sealed as a closed cavity. Then, the first driving component drives the glue squeezing head to move forward, pushing the hot-melt glue block in the front chamber to move toward the heating plate. When the hot-melt glue block contacts the heating plate, the hot-melt glue block will be gradually heated and melted into a viscous flow by the heating plate. As the glue squeezing head pushes the hot-melt glue block to continue to move forward, the solid hot-melt glue block will gradually decrease, and the hot-melt glue in a viscous flow state will continue to increase. At the same time, the hot-melt glue in a viscous flow state will enter the glue outlet channel from the glue inlet on the upper part of the heating plate, and then be squeezed out through the glue outlet channel.

[0004] A disadvantage of a hot melt adhesive dispensing device currently used is that when the open end of the front end of the glue cylinder is sealed with the heating plate, since gas will remain in the front chamber of the glue cylinder, during the gluing process, the gas in the front chamber of the glue cylinder will be squeezed out together with the hot melt adhesive, causing bubbles to appear in the extruded glue liquid, resulting in poor gluing effect. Summary of the invention

[0005] The purpose of the invention is to provide a hot melt adhesive dispensing device which does not generate bubbles during the gluing process and has a good gluing effect.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a hot melt adhesive dispensing device, comprising a glue cylinder with an open front end, a glue squeezing head is arranged inside the glue cylinder, the glue squeezing head is in contact and sealed with the inner wall of the glue cylinder, the glue squeezing head divides the inside of the glue cylinder into a relatively independent rear chamber and a front chamber for placing the hot melt adhesive block, the glue squeezing head can move forward and backward in the glue cylinder under the drive of the cylinder, a heating plate that can seal the open end of the glue cylinder and heat and melt the hot melt adhesive block is arranged just in front of the open end of the glue cylinder, the glue cylinder can move forward and backward relative to the heating plate under the drive of the cylinder, and when the glue cylinder moves forward and presses against the heating plate, the heating plate just blocks the open end of the glue cylinder and closes the front chamber of the glue cylinder into a closed cavity, a glue dispensing channel is arranged in the heating plate, which can connect the front chamber with the outside when the heating plate blocks the open end of the glue cylinder, and an exhaust mechanism that can discharge the gas in the front chamber to the outside during the gluing process is arranged on the upper part of the glue squeezing head.

[0007] Furthermore, the aforementioned hot melt adhesive dispensing device, wherein: the structure of the exhaust mechanism includes: a cavity is arranged on the upper part of the adhesive extrusion pressure head, a through hole is arranged at the front end of the adhesive extrusion pressure head to connect the cavity to the front chamber, the cavity can be connected to the outside through an air pipe, an exhaust plug that can move along the through hole is arranged in the through hole, the exhaust plug is in contact with the inner wall of the through hole, the rear end of the exhaust plug is provided with a limiting portion with a diameter larger than the through hole and located in the cavity, the lower surface of the front end of the exhaust plug is an inclined surface gradually inclined downward from front to back, an exhaust channel is arranged in the exhaust plug, the inlet of the exhaust channel is located on the upper surface of the front end of the exhaust plug, and the outlet of the exhaust channel is located on the side wall of the limiting portion of the exhaust plug, the exhaust plug can move forward along the through hole to the inlet of the exhaust channel and move out of the through hole under the action of the reset mechanism, so that the exhaust channel in the exhaust plug can be connected to the front chamber; the melted hot melt adhesive block squeezed during work can push the exhaust plug to move backward along the through hole to the inlet of the exhaust channel through the inclined surface and move into the through hole.

[0008] Furthermore, the aforementioned hot melt adhesive dispensing device, wherein: the structure of the reset mechanism includes: a high-pressure air source and a valve, the valve is arranged on the air pipe, the valve is connected to the high-pressure air source, the valve can connect the air pipe to the high-pressure air source or the outside world, and when the valve connects the air pipe to the high-pressure air source, the high-pressure gas in the high-pressure air source will enter the cavity through the air pipe, thereby pushing the exhaust plug to move forward along the through hole to the inlet of the exhaust channel and move out of the through hole, so that the exhaust channel in the exhaust plug can connect the front chamber and the cavity.

[0009] Furthermore, the aforementioned hot melt adhesive dispensing device, wherein: the specific installation structure of the air pipe includes: a first installation hole connecting the rear chamber with the outside is provided on the rear end cover of the glue cylinder, and a second installation hole connecting to the cavity is provided at the rear end of the glue extrusion head, one end of the air pipe passes through the first installation hole and extends into the second installation hole, and the air pipe is in contact and sealed connection with the second installation hole.

[0010] Furthermore, the aforementioned hot melt adhesive dispensing device, wherein: the structure of the exhaust mechanism includes: an air outlet channel connecting the front chamber and the rear chamber is arranged on the upper part of the adhesive extrusion head, the rear chamber of the adhesive cylinder is connected to the outside world, and a gate plate is arranged in the air outlet channel, and the gate plate can open or close the air outlet channel under the drive of the cylinder installed in the adhesive extrusion head.

[0011] Furthermore, the aforementioned hot melt adhesive dispensing device, wherein: an exhaust hole connecting the rear chamber with the outside is provided on the rear end cover of the glue cylinder, the exhaust hole corresponds to the air outlet of the air outlet channel front to back, an exhaust pipe is provided on the rear end cover of the glue cylinder at the exhaust hole, the front end of the exhaust pipe extends into the glue cylinder from the exhaust hole and is connected to the air outlet of the air outlet channel, so that the air outlet channel is connected to the outside through the exhaust pipe.

[0012] Furthermore, the aforementioned hot melt adhesive dispensing device, wherein: the structure of the exhaust mechanism includes: an air outlet channel connecting the front chamber and the rear chamber is arranged on the upper part of the glue extrusion pressure head, the air outlet channel axially passes through the glue extrusion pressure head, and an exhaust hole connecting the rear chamber and the outside is arranged on the rear end cover of the glue cylinder, the exhaust hole and the air outlet channel correspond front to back, and an exhaust pipe is arranged on the rear end cover of the glue cylinder at the exhaust hole, the front end of the exhaust pipe movably extends into the glue cylinder from the exhaust hole and is connected to the air outlet channel, so that the air outlet channel is connected to the outside through the exhaust pipe, and a pull rod with a diameter smaller than the diameter of the exhaust pipe and the air outlet channel is movably arranged in the exhaust pipe, the front end of the pull rod extends into the front chamber from the air outlet channel and is fixed with a plug that can close the inlet of the air outlet channel, the rear end of the pull rod extends from the exhaust pipe, and the pull rod moves forward and backward in the exhaust pipe under the drive of the cylinder, and synchronously drives the plug to move forward to open the inlet of the air outlet channel or move backward to block the inlet of the air outlet channel.

[0013] Furthermore, in the aforementioned hot melt adhesive dispensing device, the adhesive inlet of the adhesive dispensing channel is located at the lower part of the rear end surface of the heating plate.

[0014] Furthermore, in the aforementioned hot melt adhesive dispensing device, the rear end portion of the heating plate for contacting and sealing with the adhesive cylinder is a tapered end with a diameter gradually increasing from the back to the front.

[0015] Through the implementation of the above technical solution, the beneficial effect of the present invention is that during the gluing process, the gas in the front chamber of the glue cylinder will be discharged from the front chamber of the glue cylinder, so that no bubbles will appear in the glue liquid squeezed out during the gluing process, and the gluing effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a hot melt adhesive dispensing device described in the first specific embodiment of the present invention.

[0017] Figure 2 for Figure 1 The structural schematic diagram of the glue extrusion head is shown in FIG.

[0018] Figure 3 for Figure 1 Schematic diagram of the structure of the exhaust plug shown in .

[0019] Figure 4 It is a structural schematic diagram of a hot melt adhesive dispensing device described in the second specific embodiment of the present invention.

[0020] Figure 5 It is a structural schematic diagram of a hot melt adhesive dispensing device described in the third specific embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Specific implementation

[0023] like Figure 1 , Figure 2 , Figure 3As shown, the hot melt adhesive dispensing device comprises: a glue cylinder 1 with an open front end, a glue squeezing head 2 is arranged inside the glue cylinder 1, the glue squeezing head 2 is in contact and sealed with the inner wall of the glue cylinder 1, the glue squeezing head 2 divides the inside of the glue cylinder 1 into a relatively independent rear chamber 3 and a front chamber 5 for placing a hot melt adhesive block 4, the glue squeezing head 2 moves forward and backward in the glue cylinder 1 under the drive of the first cylinder 13, the piston rod of the first cylinder 13 movably extends into the glue cylinder 1 and is connected with the glue squeezing head 2, and the piston rod of the first cylinder 13 can drive the glue squeezing head 2 to move forward or backward in the glue cylinder 1 when extending or retracting; A heating plate 6 is arranged in front of the open end of the glue cylinder 1, which can seal the open end of the glue cylinder 1 and heat and melt the hot melt glue block 4. The glue cylinder 1 moves forward and backward relative to the heating plate 6 under the drive of the second cylinder 14. The piston rod of the second cylinder 14 is connected to the glue cylinder 1. When the piston rod of the second cylinder 14 is extended or retracted, it can drive the glue cylinder 1 to move forward or backward relative to the heating plate 6; and when the glue cylinder 1 moves forward and presses against the heating plate 6, the heating plate 6 just blocks the open end of the glue cylinder 1 and closes the front chamber 5 of the glue cylinder 1 into a closed cavity. When the heating plate 6 blocks the open end of the glue cylinder 1, a A glue outlet channel 7 can connect the front chamber 5 with the outside world, a cavity 8 is arranged on the upper part of the glue extrusion pressure head 2, and a through hole 9 is arranged at the front end of the glue extrusion pressure head 2 to connect the cavity 8 with the front chamber 5. The cavity 8 can be connected to the outside world through an air pipe 10, and an exhaust plug 12 that can move along the through hole 9 is arranged in the through hole 9. The exhaust plug 12 contacts the inner wall of the through hole 9, and a limiting portion 121 with a larger diameter than the through hole and located in the cavity is arranged at the rear end of the exhaust plug 12. The lower surface 122 of the front end of the exhaust plug 12 is an inclined surface that gradually tilts downward from front to back, and an exhaust passage 12 is arranged in the exhaust plug 12. The exhaust passage 123 is formed on the upper surface of the front end of the exhaust plug 12, and the outlet of the exhaust passage 123 is located on the rear side wall of the limiting portion 121 of the exhaust plug 12. The exhaust plug 12 can move forward along the through hole 9 to the inlet 1231 of the exhaust passage 123 and move out of the through hole 9 under the action of the reset mechanism, so that the exhaust passage 123 of the exhaust plug 12 can be connected to the front chamber 5; during operation, the squeezed melted hot melt adhesive block 4 can push the exhaust plug 12 to move backward along the through hole 9 to the inlet 1231 of the exhaust passage 123 and move into the through hole 9 through the inclined surface;

[0024] In this embodiment, the structure of the reset mechanism includes: a high-pressure gas source 15 and a valve 11, wherein the valve 11 is arranged on the air pipe 10, and the valve 11 is connected to the high-pressure gas source 15. The valve 11 can connect the air pipe 10 to the high-pressure gas source 15 or the outside world, and when the valve 11 connects the air pipe 10 to the high-pressure gas source 15, the high-pressure gas in the high-pressure gas source 15 will enter the cavity 8 through the air pipe 10, thereby pushing the exhaust plug 12 to move forward along the through hole 9 to the inlet 1231 of the exhaust channel 123 and move out of the through hole 9. The exhaust passage 123 in the exhaust plug 12 can connect the front chamber 5 and the cavity 8. The above reset mechanism has a simple structure and is easy to install and maintain. In this embodiment, the limiting portion 121 at the rear end of the exhaust plug 12 has the following advantages: (1) the moving position of the exhaust plug 12 can be limited by the limiting portion to prevent the exhaust plug 12 from excessively moving forward along the through hole 9 when the high-pressure gas is applied; (2) due to the large force-bearing area of ​​the limiting portion, the high-pressure gas can easily push the exhaust plug 12 to move along the through hole 9;

[0025] In this embodiment, the glue inlet 71 of the glue outlet channel 7 is located at the lower part of the rear end surface 61 of the heating plate 6. When the hot melt adhesive block 4 is heated and melted into a viscous flow by the heating plate 6, the viscous flow of hot melt adhesive will immediately cover the glue inlet 71 of the glue outlet channel 7, thereby preventing the gas in the front chamber 5 from entering the glue outlet channel 7, thereby preventing bubbles from appearing during the gluing process and improving the gluing effect. In this example, the rear end of the heating plate 6 for contacting and sealing with the glue cylinder 1 is a tapered end with a diameter gradually increasing from the back to the front, so that even if the position of the glue cylinder is slightly offset during the forward movement, the heating plate can be inserted into the glue cylinder to close the open end of the glue cylinder, thereby improving the stability of the device.

[0026] In this embodiment, the specific installation structure of the air pipe 10 includes: a first installation hole connecting the rear chamber 3 with the outside is provided on the rear end cover of the glue cylinder 1, and a second installation hole 16 connecting to the cavity 8 is provided at the rear end of the glue extrusion head 2. One end of the air pipe 10 passes through the first installation hole and then extends into the second installation hole 16. The air pipe 10 is in contact and sealed connection with the second installation hole 16. The above installation structure is simple and easy to install and maintain.

[0027] The working principle of this embodiment is as follows:

[0028] In the initial state, the control valve 11 makes the air pipe 10 communicate with the high-pressure air source 15. At this time, the high-pressure gas in the high-pressure air source 15 will enter the cavity 8 through the air pipe 10. The high-pressure gas entering the cavity 8 will push the exhaust plug 12 to move forward along the through hole 9 to the inlet 1231 of the exhaust channel 123 and move out of the through hole 9, so that the exhaust channel 123 in the exhaust plug 12 is connected to the front chamber 5. At this time, the inclined surface of the front end of the exhaust plug 12 is also located in the front chamber 5;

[0029] When performing glue squeezing, first control the valve 11 to connect the air pipe 10 with the outside, then make the first cylinder drive the glue squeezing head 2 to move backward until the front chamber 5 can accommodate the hot melt glue block 4, then stop the action of the first cylinder, and then place the hot melt glue block 4 in the front chamber 5 of the glue cylinder 1. At this time, the hot melt glue block 4 is located below the exhaust plug 12, that is, the solid hot melt glue block 4 does not contact the exhaust plug 12, and then make the second cylinder drive the glue cylinder 1 to move forward and press against the heating plate 6, so that the heating plate 6 blocks the open end of the sealing glue cylinder 1, thereby sealing the glue cylinder 1. The front chamber 5 is closed as a closed cavity, and then the first cylinder drives the glue extrusion pressure head 2 to move forward, and simultaneously pushes the hot melt adhesive block 4 in the front chamber 5 to move toward the heating plate 6. When the hot melt adhesive block 4 contacts the heating plate 6, the hot melt adhesive block 4 will be heated and melted into a viscous flow by the heating plate 6, and will immediately cover the glue inlet 71 of the glue outlet channel 7. The viscous hot melt adhesive will enter the glue outlet channel 7 from the glue inlet 71 at the lower part of the heating plate 6, and then be squeezed out through the glue outlet channel 7. During the hot melt adhesive discharging process, the gas in the front chamber 5 will continuously pass through the exhaust plug 12 to discharge the hot melt adhesive. The air passage 123 enters the cavity 8 in the glue extrusion head 2, and then is discharged to the outside through the air pipe 10, and will not be discharged from the glue outlet passage 7 along with the hot melt adhesive, thereby effectively preventing the appearance of bubbles in the glue liquid squeezed out during the gluing process; as the glue extrusion head 2 pushes the hot melt adhesive block 4 to continue to move forward, the solid hot melt adhesive block 4 will gradually decrease, and the viscous hot melt adhesive will continue to increase. As the viscous hot melt adhesive continues to increase, the liquid level of the viscous hot melt adhesive in the front chamber 5 of the glue cylinder will continue to rise. When the viscous hot melt adhesive rises and contacts the inclined lower surface 1 of the exhaust plug 12, the liquid level of the viscous hot melt adhesive in the front chamber 5 of the glue cylinder will continue to rise. At 22, as the liquid level of the viscous hot melt adhesive continues to rise, the viscous hot melt adhesive will gradually push the exhaust plug 12 to move backward along the through hole 9. When the exhaust plug 12 is pushed by the viscous hot melt adhesive to the inlet 1231 of the exhaust channel 123 and moves into the through hole 9, the air in the front chamber 5 has been basically exhausted. Then the first cylinder continues to push the glue extrusion head 2 forward, pushing the viscous hot melt adhesive from the glue inlet 71 at the bottom of the heating plate 6 into the glue outlet channel 7, and then squeezed out through the glue outlet channel 7 until the hot melt adhesive in the front chamber 5 completes the glue extrusion work.

[0030] The invention has the advantages that during the gluing process, the gas in the front chamber of the glue cylinder will be discharged from the front chamber of the glue cylinder, so that no bubbles will appear in the glue liquid squeezed out during the gluing process, and the gluing effect is good. Specific embodiment 2

[0032] like Figure 4As shown, the hot melt adhesive dispensing device comprises: a glue cylinder 101 with an open front end, a glue squeezing head 201 is arranged inside the glue cylinder 101, the glue squeezing head 201 is in sealing contact with the inner wall of the glue cylinder 101, the glue squeezing head 201 divides the inside of the glue cylinder 101 into a relatively independent rear chamber 301 and a front chamber 501 for placing a hot melt adhesive block 401, the glue squeezing head 201 moves forward and backward in the glue cylinder 101 under the drive of the third cylinder 601; a heating plate 701 that can seal the open end of the glue cylinder and heat and melt the hot melt adhesive block 401 is arranged in front of the open end of the glue cylinder 101, and the glue cylinder 101 moves forward and backward relative to the heating plate 701 under the drive of the fourth cylinder 801 When the glue cylinder 101 moves forward and presses against the heating plate 701, the heating plate 701 just blocks the open end of the sealing glue cylinder 101, and the front chamber 501 of the glue cylinder 101 is sealed as a closed cavity. A glue outlet channel 901 connecting the front chamber 501 with the outside is provided in the heating plate 701, and an air outlet channel 1001 connecting the front chamber 501 and the rear chamber 301 is provided on the upper part of the glue squeezing head 201. The rear chamber 301 of the glue cylinder 101 is connected to the outside, and a gate 1301 is provided in the air outlet channel 1001. The gate 1301 can open or close the air outlet channel 1001 under the drive of the cylinder 1401 installed in the glue squeezing head 201; in this embodiment, in the glue The rear end cover 1101 of the cylinder 101 is provided with an exhaust hole 1201 connecting the rear chamber 301 with the outside world. The exhaust hole 1201 corresponds to the air outlet of the air outlet channel 1001 in front and back. An exhaust pipe 1501 is provided on the rear end cover of the glue cylinder 101 at the exhaust hole 1201. The front end of the exhaust pipe 1501 extends into the glue cylinder 101 from the exhaust hole 1201 and is connected to the air outlet of the air outlet channel 1001, so that the air outlet channel 1001 is connected to the outside world through the exhaust pipe 501. The exhaust pipe can prevent the glue extrusion head from rotating during the process of moving forward and backward along the glue cylinder, further improving the stability and safety of the equipment. In this embodiment, the glue inlet of the glue outlet channel 901 The opening 9101 is located at the lower part of the rear end surface 7101 of the heating plate 701, so that when the hot melt adhesive block 401 is heated and melted into a viscous flow by the heating plate 701, the hot melt adhesive will immediately cover the adhesive inlet 9101 of the adhesive outlet channel 901, thereby preventing the gas in the front chamber 501 from entering the adhesive outlet channel 901, so that no bubbles will appear in the adhesive liquid squeezed out during the gluing process, thereby improving the gluing effect; in this embodiment, the rear end portion of the heating plate 701 for contacting and sealing with the glue cylinder 101 is a tapered end with a diameter gradually increasing from the back to the front, so that even if the position of the glue cylinder is slightly offset during the forward movement, the heating plate can be inserted into the glue cylinder to close the open end of the glue cylinder, thereby improving the stability of the device;

[0033] The working principle of this embodiment is as follows:

[0034] First, the third cylinder 601 drives the glue squeezing head 201 to move backward until the front chamber 501 can accommodate the hot melt glue block 401, then the action of the third cylinder 601 is stopped, and then the hot melt glue block 401 is placed in the front chamber 501 of the glue cylinder 101, and then the fourth cylinder 801 drives the glue cylinder 101 to move forward and press against the heating plate 701. At this time, the heating plate 701 just blocks the open end of the sealing glue cylinder 101, and the front chamber 501 of the glue cylinder 101 is sealed into a closed cavity. The cylinder 1401 controls the gate 1301 to open the air outlet channel 1001. At this time, the front chamber 501 is connected to the outside world through the air outlet channel 1001 and the exhaust pipe 1501. Then the third cylinder 601 drives the glue extrusion head 201 to move forward, and simultaneously pushes the hot melt adhesive block 401 in the front chamber 501 to move toward the heating plate 701. When the hot melt adhesive block 401 contacts the heating plate 701, the hot melt adhesive block 401 will be heated by the heating plate 701 to melt into a viscous flow and immediately cover the hot melt adhesive block 401. The glue inlet 9101 of the glue outlet channel 901 is covered. As the glue extrusion head 201 pushes the hot melt glue block 401 to continue to move forward, the solid hot melt glue block 401 will gradually decrease, and the viscous hot melt glue will continue to increase. At the same time, the viscous hot melt glue will enter the glue outlet channel 901 from the glue inlet 9101 at the lower part of the heating plate 701, and then be squeezed out through the glue outlet channel 901. During the hot melt glue melting and glue outlet process, the gas in the front chamber 501 will continuously pass through the gas outlet channel 1001 and the exhaust pipe 150 1 is discharged to the outside, and will not be discharged from the glue outlet channel 901 along with the hot melt adhesive, so that no bubbles will appear in the glue liquid squeezed out during the gluing process. When the viscous hot melt adhesive in the front chamber 501 is about to overflow to the air outlet channel 1001, the cylinder 1401 controls the gate 1301 to close the air outlet channel 1001. At this time, the gas in the front chamber 501 is exhausted and filled with viscous hot melt adhesive. As the glue extrusion head 201 continues to move forward, the hot melt adhesive in the front chamber 501 completes the glue extrusion work.

[0035] The invention has the advantages that during the gluing process, the gas in the front chamber of the glue cylinder will be discharged from the front chamber of the glue cylinder, so that no bubbles will appear in the glue liquid squeezed out during the gluing process, and the gluing effect is good. Specific embodiment three

[0037] like Figure 5As shown, the hot melt adhesive dispensing device comprises: a glue cylinder 102 with an open front end, a glue squeezing head 202 is arranged inside the glue cylinder 102, the glue squeezing head 202 is in sealing contact with the inner wall of the glue cylinder 102, the glue squeezing head 202 divides the inside of the glue cylinder 102 into a relatively independent rear chamber 302 and a front chamber 502 for placing a hot melt adhesive block 402, the glue squeezing head 202 is driven by a fifth cylinder 602 to move back and forth in the glue cylinder 102, a heating plate 702 that can seal the open end of the glue cylinder and heat and melt the hot melt adhesive block 402 is arranged in front of the open end of the glue cylinder 102, and the glue cylinder 102 is driven by a sixth cylinder 802 to move back and forth relative to the heating plate 702 The glue cylinder 102 moves forward and when it is pressed against the heating plate 702, the heating plate 702 just blocks the open end of the sealing glue cylinder 102, and the front chamber 502 of the glue cylinder 102 is sealed as a closed cavity. A glue outlet passage 902 connecting the front chamber 502 with the outside is provided in the heating plate 702. An air outlet passage 1002 connecting the front chamber 502 with the rear chamber 302 is provided on the upper part of the glue squeezing head 202. The rear chamber 302 of the glue cylinder 102 is connected with the outside. The air outlet passage 1002 axially penetrates the glue squeezing head 202. An exhaust hole 1202 connecting the rear chamber 302 with the outside is provided on the rear end cover 1102 of the glue cylinder 102. The exhaust hole 1202 is connected to the exhaust hole 1202. The front and rear of the air channel 1002 correspond to each other. An exhaust pipe 1602 is arranged on the rear end cover 1102 of the glue cylinder at the exhaust hole 1202. The front end of the exhaust pipe 1602 movably extends into the glue cylinder 102 from the exhaust hole and is connected to the air outlet channel 1002, so that the air outlet channel 1002 is connected to the outside through the exhaust pipe 1502. A pull rod 1702 with a diameter smaller than the diameter of the exhaust pipe 1602 and the air outlet channel 1002 is movably arranged in the exhaust pipe 1602. The front end of the pull rod 1702 extends from the air outlet channel 1002 into the front chamber 502 and is fixed with a plug 1802 that can close the inlet of the air outlet channel 1002. The rear end of the pull rod 1702 extends from the exhaust pipe 1602 into the front chamber 502. The pull rod 1702 is extended, and driven by the first cylinder 1902, it moves forward and backward in the exhaust pipe 1602, and synchronously drives the plug 1802 to move forward to open the inlet of the air outlet channel 1002 or move backward to block the inlet of the air outlet channel 1002. In this embodiment, the glue inlet 9102 of the glue outlet channel 902 is located at the lower part of the rear end surface 7102 of the heating plate 702, so that when the hot melt adhesive block 402 is heated and melted into a viscous flow by the heating plate 702, the hot melt adhesive will immediately cover the glue inlet 9102 of the glue outlet channel 902, so as to prevent the gas in the front chamber 502 from entering the glue outlet channel 902, so that no bubbles will appear in the glue liquid squeezed out during the gluing process, thereby improving the gluing effect;

[0038] In this embodiment, the rear end of the heating plate 702 for contacting and sealing with the glue cylinder 102 is a tapered end with a diameter gradually increasing from the back to the front, so that even if the position of the glue cylinder is slightly offset during the forward movement, the heating plate can be inserted into the glue cylinder to close the open end of the glue cylinder, thereby improving the use stability of the device; in this embodiment, the plug 1802 is set in a tapered shape with a diameter gradually increasing from the back to the front, so that even if the position of the plug 1802 is slightly offset during the backward movement, the plug 1802 can be inserted into the air outlet channel 1002 to close the air outlet channel, thereby further improving the use stability of the device;

[0039] The working principle of this embodiment is as follows:

[0040] First, the fifth cylinder 602 drives the glue extruding head 202 to move backward until the front chamber 502 can accommodate the hot melt glue block 402, then the fifth cylinder 602 stops moving, and then the hot melt glue block 402 is placed in the front chamber 502 of the glue cylinder 102. Then, the sixth cylinder 802 drives the glue cylinder 102 to move forward and press against the heating plate 702. At this time, the heating plate 702 just blocks the open end of the sealing glue cylinder 102, and the front chamber 402 of the glue cylinder 102 is sealed into a closed cavity. Then, the seventh cylinder 1902 is driven by the pull rod 170 2 drives the plug 1802 to move forward to open the air outlet channel 1002. At this time, the front chamber 502 is connected to the outside world through the air outlet channel 1002 and the exhaust pipe 1602; then the fifth cylinder 602 drives the glue extrusion head 202 to move forward, and simultaneously pushes the hot melt glue block 402 in the front chamber 502 to move toward the heating plate 702. When the hot melt glue block 402 contacts the heating plate 702, the hot melt glue block 402 will be heated and melted by the heating plate 702 into a viscous flow, and immediately covers the glue inlet 9102 of the glue outlet channel 902. The glue pressing head 202 pushes the hot melt glue block 402 to continue to move forward, the solid hot melt glue block 402 will gradually decrease, and the viscous hot melt glue will continue to increase. At the same time, the viscous hot melt glue will enter the glue outlet channel 902 from the glue inlet 9102 at the bottom of the heating plate 702, and then be squeezed out through the glue outlet channel 902. During the hot melt glue outlet process, the gas in the front chamber 502 will continuously be discharged to the outside through the gap between the air outlet channel 1002 and the pull rod 1702, and the gap between the exhaust pipe 1602 and the pull rod 1702, and will not be discharged with the hot melt glue. It is discharged from the glue outlet channel 902 so that no bubbles will appear in the glue liquid squeezed out during the gluing process. When the viscous hot melt adhesive in the front chamber 502 is about to overflow to the air outlet channel 1002, the seventh cylinder 1902 drives the plug 1802 to move backward through the pull rod 1702 to block the air outlet channel 1002. At this time, the gas in the front chamber 502 is exhausted and filled with viscous hot melt adhesive. As the glue extrusion pressure head 202 continues to move forward, the glue extrusion pressure head 202 will push the plug 18 forward together until the hot melt adhesive in the front chamber 501 completes the glue extrusion work.

[0041] The invention has the advantages that during the gluing process, the gas in the front chamber of the glue cylinder will be discharged from the front chamber of the glue cylinder, so that no bubbles will appear in the glue liquid squeezed out during the gluing process, and the gluing effect is good.

[0042] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A hot melt adhesive dispensing device, characterized in that: The invention comprises a glue cylinder with an open front end, a glue squeezing head is arranged inside the glue cylinder, the glue squeezing head is in contact and sealed with the inner wall of the glue cylinder, the glue squeezing head divides the inside of the glue cylinder into a relatively independent rear chamber and a front chamber for placing a hot melt glue block, the glue squeezing head can move forward and backward in the glue cylinder under the drive of the cylinder, a heating plate which can seal the open end of the glue cylinder and heat and melt the hot melt glue block is arranged just in front of the open end of the glue cylinder, the glue cylinder can move forward and backward relative to the heating plate under the drive of the cylinder, and when the glue cylinder moves forward and presses against the heating plate, the heating plate just blocks the open end of the glue cylinder and closes the front chamber of the glue cylinder into a closed cavity, a glue outlet channel which can connect the front chamber with the outside when the heating plate blocks the open end of the glue cylinder is arranged in the heating plate, and an exhaust mechanism which can discharge the gas in the front chamber to the outside during the glue application process is arranged on the upper part of the glue squeezing head; The structure of the exhaust mechanism includes: a cavity is arranged at the upper part of the glue extrusion pressure head, a through hole is arranged at the front end of the glue extrusion pressure head to connect the cavity to the front chamber, the cavity can be connected to the outside through an air pipe, an exhaust plug that can move along the through hole is arranged in the through hole, the exhaust plug contacts the inner wall of the through hole, a limiting part with a diameter larger than the through hole and located in the cavity is arranged at the rear end of the exhaust plug, the lower surface of the front end of the exhaust plug is an inclined surface gradually inclined downward from front to back, an exhaust channel is arranged in the exhaust plug, the inlet of the exhaust channel is located on the upper surface of the front end of the exhaust plug, and the outlet of the exhaust channel is located on the side wall of the limiting part of the exhaust plug, the exhaust plug can move forward along the through hole to the inlet of the exhaust channel and move out of the through hole under the action of the reset mechanism, so that the exhaust channel in the exhaust plug can connect to the front chamber; the melted hot melt adhesive block squeezed during work can push the exhaust plug to move backward along the through hole to the inlet of the exhaust channel through the inclined surface and move into the through hole; The structure of the reset mechanism includes: a high-pressure gas source and a valve, wherein the valve is arranged on the air pipe, and the valve is connected to the high-pressure gas source. The valve can connect the air pipe to the high-pressure gas source or the outside world, and when the valve connects the air pipe to the high-pressure gas source, the high-pressure gas in the high-pressure gas source will enter the cavity through the air pipe, thereby pushing the exhaust plug to move forward along the through hole to the inlet of the exhaust channel and move out of the through hole, so that the exhaust channel in the exhaust plug can connect the front chamber and the cavity; the glue inlet of the glue outlet channel is located at the lower part of the rear end surface of the heating plate; the rear end portion of the heating plate used for contacting and sealing with the glue cylinder is a tapered end with a diameter gradually increasing from back to front.

2. A hot melt adhesive dispensing device according to claim 1, characterized in that: The specific installation structure of the air pipe includes: a first installation hole connecting the rear chamber with the outside is set on the rear end cover of the glue cylinder, and a second installation hole connecting to the cavity is set at the rear end of the glue extrusion head. One end of the air pipe passes through the first installation hole and extends into the second installation hole, and the air pipe is in contact and sealed connection with the second installation hole.

3. A hot melt adhesive dispensing device, characterized in that: The invention comprises a glue cylinder with an open front end, a glue squeezing head is arranged inside the glue cylinder, the glue squeezing head is in contact and sealed with the inner wall of the glue cylinder, the glue squeezing head divides the inside of the glue cylinder into a relatively independent rear chamber and a front chamber for placing a hot melt glue block, the glue squeezing head can move forward and backward in the glue cylinder under the drive of the cylinder, a heating plate which can seal the open end of the glue cylinder and heat and melt the hot melt glue block is arranged just in front of the open end of the glue cylinder, the glue cylinder can move forward and backward relative to the heating plate under the drive of the cylinder, and when the glue cylinder moves forward and presses against the heating plate, the heating plate just blocks the open end of the glue cylinder and closes the front chamber of the glue cylinder into a closed cavity, a glue outlet channel which can connect the front chamber with the outside when the heating plate blocks the open end of the glue cylinder is arranged in the heating plate, and an exhaust mechanism which can discharge the gas in the front chamber to the outside during the glue application process is arranged on the upper part of the glue squeezing head; The structure of the exhaust mechanism includes: an air outlet channel connecting the front chamber and the rear chamber is arranged on the upper part of the glue extrusion head, the rear chamber of the glue cylinder is connected to the outside, and a gate is arranged in the air outlet channel. The gate can open or close the air outlet channel under the drive of the cylinder installed in the glue extrusion head; the glue inlet of the glue outlet channel is located at the lower part of the rear end surface of the heating plate; the rear end part of the heating plate used for contacting and sealing with the glue cylinder is a tapered end with a diameter gradually increasing from back to front.

4. A hot melt adhesive dispensing device according to claim 3, characterized in that: An exhaust hole connecting the rear chamber with the outside is arranged on the rear end cover of the glue cylinder. The exhaust hole corresponds to the air outlet of the air outlet channel in front and back. An exhaust pipe is arranged on the rear end cover of the glue cylinder at the exhaust hole. The front end of the exhaust pipe extends into the glue cylinder from the exhaust hole and is connected to the air outlet of the air outlet channel, so that the air outlet channel is connected to the outside through the exhaust pipe.

5. A hot melt adhesive dispensing device, characterized in that: The invention comprises a glue cylinder with an open front end, a glue squeezing head is arranged inside the glue cylinder, the glue squeezing head is in contact and sealed with the inner wall of the glue cylinder, the glue squeezing head divides the inside of the glue cylinder into a relatively independent rear chamber and a front chamber for placing a hot melt glue block, the glue squeezing head can move forward and backward in the glue cylinder under the drive of the cylinder, a heating plate which can seal the open end of the glue cylinder and heat and melt the hot melt glue block is arranged just in front of the open end of the glue cylinder, the glue cylinder can move forward and backward relative to the heating plate under the drive of the cylinder, and when the glue cylinder moves forward and presses against the heating plate, the heating plate just blocks the open end of the glue cylinder and closes the front chamber of the glue cylinder into a closed cavity, a glue outlet channel which can connect the front chamber with the outside when the heating plate blocks the open end of the glue cylinder is arranged in the heating plate, and an exhaust mechanism which can discharge the gas in the front chamber to the outside during the glue application process is arranged on the upper part of the glue squeezing head; The structure of the exhaust mechanism includes: an air outlet passage connecting the front chamber and the rear chamber is arranged on the upper part of the extrusion head, the air outlet passage axially penetrates the extrusion head, an exhaust hole connecting the rear chamber and the outside is arranged on the rear end cover of the glue cylinder, the exhaust hole and the air outlet passage correspond to each other front and back, an exhaust pipe is arranged on the rear end cover of the glue cylinder at the exhaust hole, the front end of the exhaust pipe extends into the glue cylinder from the exhaust hole and is connected to the air outlet passage, so that the air outlet passage is connected to the outside through the exhaust pipe, and a small diameter is movably arranged in the exhaust pipe. A pull rod is configured to adjust the diameter of the exhaust pipe and the air outlet channel. The front end of the pull rod extends from the air outlet channel into the front chamber and is fixed with a plug that can close the inlet of the air outlet channel. The rear end of the pull rod extends from the exhaust pipe. The pull rod moves back and forth in the exhaust pipe under the drive of the cylinder, and simultaneously drives the plug to move forward to open the inlet of the air outlet channel or move backward to block the inlet of the air outlet channel; the glue inlet of the glue outlet channel is located at the lower part of the rear end surface of the heating plate; the rear end of the heating plate used for contacting and sealing with the glue cylinder is a tapered end with a diameter gradually increasing from back to front.

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