Platen-type hot-melt adhesive dispensing device

Abstract

Disclosed is a platen-type hot-melt adhesive dispensing device. A heating rod is embedded and mounted in each mounting hole on a platen body, a plurality of first ribs, a plurality of second ribs and a plurality of third ribs are provided on a lower surface of the platen body, a beveled surface is provided at one end of each of the first ribs, the second ribs and the third ribs, a flow distribution rib is provided between any two adjacent second ribs, a notch is provided in each flow distribution rib, a transfer block is provided below a metering pump, an L-shaped liquid intake flow channel on the transfer block is in communication with an adhesive supply flow channel on an adhesive supply block, an L-shaped liquid output flow channel is in communication with an adhesive inlet by means of a connecting block provided with a communication flow channel, and at least one heating tube is embedded and mounted on the transfer block, the adhesive supply block and the connecting block. The platen-type hot-melt adhesive dispensing device not only realizes rapid heating of a solid hot-melt adhesive to facilitate continuous adhesive supply, but also guides the adhesive and adaptively regulates adhesive pressure while quickly collecting the adhesive to ensure the adhesive supply efficiency, and can also heat the adhesive in real time to ensure the fluidity of the hot-melt adhesive.

Description

Press-plate type hot melt dispensing device Technical Field

[0001] This invention relates to the field of dispensing technology, and in particular to a pressure plate type hot melt dispensing device. Background Technology

[0002] Hot melt adhesives are melted by high-temperature heating, resulting in a fluid adhesive liquid. When dispensing hot melt adhesive, it is necessary to heat the liquid first, and then use a dispensing device for supplying and dispensing. Existing dispensing devices, during the supply process, cannot directly and quickly heat the solid hot melt adhesive before dispensing. Furthermore, when the pressure plate is pressed down, it cannot rapidly gather, guide, or adaptively adjust the adhesive pressure, and it cannot heat the adhesive liquid in real time, thus failing to guarantee the fluidity of the hot melt adhesive. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a pressure plate type hot melt dispensing device, which can not only realize the continuous supply of hot melt adhesive, but also guide the adhesive and adaptively adjust the adhesive pressure while rapidly collecting the adhesive to ensure the supply efficiency, and can also heat the adhesive in real time to ensure the fluidity of the hot melt adhesive.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a pressure plate type hot melt dispensing device, comprising: a carrier plate for placing a hot melt glue cylinder, at least two lifting cylinders vertically mounted on the upper surface of the carrier plate, a movable plate connected between the upper ends of the piston rods of the lifting cylinders, a pressure plate body connected to the movable plate by at least two vertical connecting rods, a metering pump, and a dispensing valve. The pressure plate body, whose side surface is sealed to the inner wall of the hot melt glue cylinder, has a through-hole for dispensing glue in its center. This through-hole is connected to the inlet of the metering pump via a pipeline, and the outlet of the metering pump is connected to the inlet of the dispensing valve. The pressure plate body... Several mounting holes are provided on the outside of the glue outlet hole, and a heating rod is embedded in each mounting hole. The lower surface of the pressure plate body gradually slopes downward in the radial outward direction of the pressure plate body. Several first convex strips, second convex strips and third convex strips are provided on the lower surface of the pressure plate body, each extending radially along the pressure plate body. The thickness of each first convex strip, second convex strip and third convex strip gradually decreases in the radial outward direction of the pressure plate body, so that the lower surfaces of the first convex strips, second convex strips and third convex strips are flush and used for extrusion contact with the hot melt adhesive in the hot melt glue cylinder.

[0005] Several first protrusions are evenly spaced in the circumferential direction. Between any two adjacent first protrusions, there are two second protrusions spaced in the circumferential direction. Between each second protrusion and an adjacent first protrusion, there is a third protrusion. Between any two adjacent second protrusions, there is a diversion protrusion. The end face of each of the diversion protrusions, first protrusions, second protrusions and third protrusions, whose lengths decrease sequentially, is flush with the outer circumferential surface of the pressure plate body. The other end of the diversion protrusion extends to the edge of the glue outlet hole. A notch is opened between the ends of the two second protrusions on both sides of each diversion protrusion near the glue outlet hole, so that the guide flow channel formed between each diversion protrusion and the second protrusions on both sides is interconnected. The lower part of the end face of each diversion protrusion, first protrusion, second protrusion and third protrusion away from the glue outlet hole is provided with an inwardly inclined bevel.

[0006] Below the metering pump is a connecting block with an L-shaped inlet channel and an L-shaped outlet channel. One end of the L-shaped inlet channel is connected to the inlet of the metering pump, and the other end extends to one side surface of the connecting block and connects to the glue supply channel on a glue supply block. The end of the glue supply channel away from the L-shaped inlet channel is connected to the glue outlet through a glue supply pipe. The other end of the L-shaped outlet channel, which is connected to the outlet of the metering pump, extends to another side surface of the connecting block and connects to the glue inlet of the dispensing valve through a connecting block with a connecting channel. At least one heating element is embedded in each of the connecting block, the glue supply block, and the connecting block.

[0007] The following are further improvements to the above technical solution:

[0008] 1. In the above scheme, an inlet pressure sensor is installed on the glue supply block, and an outlet pressure sensor is installed on the adapter block. Both the inlet pressure sensor and the outlet pressure sensor include a body, a sensing unit located at one end of the body, and a control unit located at the other end of the body. The sensing unit of the inlet pressure sensor is connected to the glue supply channel through a pipeline, and the sensing unit of the outlet pressure sensor is connected to the end of the L-shaped liquid outlet channel near the connecting block through a pipeline. Several metal fins are provided on the outer side of the body of the inlet pressure sensor and the outlet pressure sensor near the sensing unit.

[0009] 2. In the above scheme, the metal fin is an annular fin.

[0010] 3. In the above scheme, the adapter block, glue supply block and connecting block are all stainless steel blocks.

[0011] 4. In the above scheme, a heating tube is embedded in the adapter block and the connecting block, and a heating tube is embedded in the glue supply block on both sides of the L-shaped liquid inlet channel and the L-shaped liquid outlet channel.

[0012] 5. In the above scheme, the lower surfaces of the diversion ridge, the first ridge, the second ridge, and the third ridge are all flush.

[0013] 6. In the above scheme, the lower surfaces of the diversion protrusion, the first protrusion, the second protrusion and the third protrusion are all arc-shaped surfaces.

[0014] 7. In the above scheme, 16 heating rods are provided.

[0015] 8. In the above solution, the upper surface of the pressure plate body has an upward protrusion, and several horizontally extending and parallel mounting holes are provided on the side surface of the protrusion and on both sides of the glue outlet hole.

[0016] 9. In the above scheme, a cover plate is provided on the top of the pressure plate body.

[0017] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0018] 1. The present invention relates to a pressure plate type hot melt dispensing device, wherein the pressure plate body has several mounting holes on the outside of the dispensing through hole, and a heating rod is embedded in each mounting hole. The lower surface of the pressure plate body gradually slopes downward in the radial outward direction. The lower surface of the pressure plate body is provided with several first protrusions, second protrusions, and third protrusions, each extending radially along the pressure plate body. The thickness of each first protrusion, second protrusion, and third protrusion gradually decreases in the radial outward direction, thereby making the lower surfaces of the first protrusions, second protrusions, and third protrusions flush with each other and used for contact with the heat in the hot melt glue cylinder. The extrusion contact of the molten adhesive can both transfer the heat generated by the heating rod to the surface of the hot melt adhesive through the protrusions, rapidly heating the initially solid hot melt adhesive so that the heated and molten, fluid hot melt liquid can be discharged from the dispensing hole for continuous adhesive supply, and accelerate the melting of the hot melt adhesive in the area around the dispensing hole and allow the fluid adhesive to quickly gather in the area around the dispensing hole to ensure adhesive supply efficiency. It also improves the sealing performance between the pressure plate body and the hot melt adhesive cylinder, effectively preventing adverse interference caused by adhesive overflow. Furthermore, two... The device consists of two circumferentially spaced second protrusions. Each second protrusion is connected to an adjacent first protrusion by a third protrusion. A diversion protrusion is positioned between any two adjacent second protrusions. The end faces of the diversion protrusion, first protrusion, second protrusion, and third protrusion, whose lengths decrease sequentially, are flush with the outer circumferential surface of the pressure plate body. The other end of the diversion protrusion extends to the edge of the glue outlet hole. A notch is formed between the ends of the two second protrusions on either side of each diversion protrusion near the glue outlet hole, allowing the guide channels formed between each diversion protrusion and the second protrusions on either side to communicate with each other. Each of the diverting protrusions, the first protrusion, the second protrusion, and the third protrusion has an inwardly inclined chamfered surface at the lower part of the end face away from the glue outlet. This not only guides the direction of glue flow but also mixes and equalizes the glue from various directions through staggered guide channels, thereby improving the uniformity and consistency of glue supply pressure. Furthermore, the chamfered surface at the end of each protrusion connects the guide channels formed between adjacent protrusions in the area near the seal between the pressure plate body and the hot melt glue cylinder. This allows for adaptive adjustment of the pressure in the area between the pressure plate body and the glue surface to ensure the flatness of the pressure plate, thereby further improving the stability of glue supply.

[0019] 2. In the pressure plate type hot melt dispensing device of the present invention, a transition block is provided below the metering pump. The transition block has an L-shaped inlet channel and an L-shaped outlet channel. One end of the L-shaped inlet channel is connected to the inlet of the metering pump, and the other end extends to a side surface of the transition block and connects to a glue supply channel on a glue supply block. The end of the glue supply channel away from the L-shaped inlet channel is connected to the glue outlet through a glue supply pipe. The other end of the L-shaped outlet channel, which is connected to the outlet of the metering pump, extends to the transition block. On the other side surface, it is connected to the glue inlet of the dispensing valve through a connecting block with a connecting channel. Each of the adapter block, glue supply block and connecting block is embedded with at least one heating tube. On the basis of metering and increasing the glue, hot melt glue can be used to shorten the curing time after dispensing, thereby saving the workshop area occupied in the photovoltaic glass processing. At the same time, the glue can be heated in real time during the glue supply to the dispensing valve to ensure the fluidity of the hot melt glue, thereby ensuring the accuracy and effect of dispensing.

[0020] 3. The pressure plate type hot melt dispensing device of the present invention has an inlet pressure sensor installed on the glue supply block and an outlet pressure sensor installed on the adapter block. Both the inlet and outlet pressure sensors include a body, a sensing unit located at one end of the body, and a control unit located at the other end of the body. The sensing unit of the inlet pressure sensor is connected to the glue supply channel through a pipeline, and the sensing unit of the outlet pressure sensor is connected to the end of the L-shaped liquid outlet channel near the connecting block through a pipeline. Several metal fins are provided on the outer side of the body of the inlet and outlet pressure sensors near the sensing unit. This allows for real-time monitoring of the inlet and outlet pressures of the metering pump to avoid abnormal glue supply pressure caused by glue circuit blockage, and can effectively prevent damage to the sensors due to excessive glue temperature. Attached Figure Description

[0021] Figure 1 is a schematic diagram of the structure of the pressure plate type hot melt dispensing device of the present invention;

[0022] Figure 2 is a partial structural schematic diagram of the pressure plate type hot melt dispensing device of the present invention;

[0023] Figure 3 is a cross-sectional view along AA in Figure 2 of this invention;

[0024] Figure 4 is a partial structural schematic diagram of the pressure plate type hot melt dispensing device of the present invention;

[0025] Figure 5 is a cross-sectional view along BB in Figure 4 of this invention;

[0026] Figure 6 is a partial structural schematic diagram of the lower surface of the pressure plate body of the pressure plate type hot melt dispensing device of the present invention;

[0027] Figure 7 is a partial structural schematic diagram of the pressure plate type hot melt dispensing device of the present invention;

[0028] Figure 8 is a partial structural cross-sectional view of Figure 7 of the present invention;

[0029] Figure 9 is a partial structural schematic diagram of the pressure plate type hot melt dispensing device of the present invention;

[0030] Figure 10 is a partial structural cross-sectional view of Figure 9 of the present invention.

[0031] In the attached diagrams: 100, hot melt glue cylinder; 200, carrier plate; 300, lifting cylinder; 400, movable plate; 500, vertical connecting rod; 1, pressure plate body; 2, sealing groove; 3, sealing ring; 4, glue outlet hole; 5, mounting hole; 6, heating rod; 7, cover plate; 71, through hole; 8, protrusion; 91, vent; 92, sealing rod; 10, diversion protrusion; 11, first protrusion; 12, second protrusion; 13, third protrusion; 14, notch; 15, beveled surface; 16, glue inlet pressure sensor; 17, glue outlet pressure. 18. Sensor; 19. Body; 20. Sensing unit; 21. Control unit; 22. Metal fins; 22. Adhesive supply block; 221. Adhesive supply channel; 23. Adhesive supply tube; 24. Connecting block; 241. Connecting channel; 25. Heating element; 26. Base plate; 27. Temperature sensor; 29. ​​Metering pump; 291. Liquid inlet; 292. Liquid outlet; 30. Adapter block; 31. L-shaped liquid inlet channel; 32. L-shaped liquid outlet channel; 33. Dispensing valve; 34. Adhesive inlet; 351. First air pipe connector; 352. Second air pipe connector. Detailed Implementation

[0032] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0033] Example 1: A pressure plate type hot melt dispensing device, comprising: a carrier plate 200 for placing a hot melt glue cylinder 100, at least two lifting cylinders 300 vertically mounted on the upper surface of the carrier plate 200, a movable plate 400 connected between the upper ends of the piston rods of the lifting cylinders 300, a pressure plate body 1 connected to the movable plate 400 by at least two vertical connecting rods 500, a metering pump 29, and a dispensing valve 33. The pressure plate body 1, whose side surface is sealed to the inner wall of the hot melt glue cylinder 100, has a through-hole 4 at its center. This through-hole 4 is connected to the inlet 291 of the metering pump 29 via a pipeline. The outlet 292 of the metering pump 29 is connected to the inlet 34 of the dispensing valve 33. The pressure plate body 1... Several mounting holes 5 are provided on the outside of the glue outlet hole 4. A heating rod 6 is embedded in each mounting hole 5. The lower surface of the pressure plate body 1 gradually slopes downward in the radial outward direction. The lower surface of the pressure plate body 1 is provided with several first protrusions 11, second protrusions 12 and third protrusions 13, each extending radially along the pressure plate body 1. The thickness of each first protrusion 11, second protrusion 12 and third protrusion 13 gradually decreases in the radial outward direction along the pressure plate body 1, so that the lower surfaces of the first protrusions 11, second protrusions 12 and third protrusions 13 are flush and used for extrusion contact with the hot melt adhesive in the hot melt glue cylinder 100.

[0034] Several first protrusions 11 are evenly spaced in the circumferential direction. Between any two adjacent first protrusions 11, there are two second protrusions 12 spaced in the circumferential direction. Between each second protrusion 12 and an adjacent first protrusion 11, there is a third protrusion 13. Between any two adjacent second protrusions 12, there is a diversion protrusion 10. The end face of each of the diversion protrusion 10, first protrusion 11, second protrusion 12 and third protrusion 13, whose lengths decrease sequentially, is flush with the outer circle of the pressure plate body 1. The circumference is flush, and the other end of the diversion protrusion 10 extends to the edge outside the glue outlet hole 4. A notch 14 is opened between the ends of the two second protrusions 12 on each diversion protrusion 10 and located on both sides of it near the glue outlet hole 4, so that the guide flow channel formed between each diversion protrusion 10 and the second protrusions 12 on both sides is interconnected. Each diversion protrusion 10, the first protrusion 11, the second protrusion 12 and the third protrusion 13 is provided with an inwardly inclined chamfered surface 15 at the lower part of the end face away from the glue outlet hole 4.

[0035] The continuous downward pressure of the pressure plate causes the molten adhesive in the glue tank to be continuously discharged from the dispensing hole, thus ensuring a continuous supply of adhesive to subsequent dispensing valves. During this process, the liquid adhesive, guided by the inclined lower surface of the pressure plate body, quickly converges towards the area around the dispensing hole to ensure efficient adhesive supply. This also improves the sealing performance between the pressure plate body and the hot melt glue cylinder, effectively preventing adverse interference caused by adhesive overflow. Furthermore, the multiple guide channels formed between adjacent protrusions not only guide the direction of adhesive flow but also mix and equalize the adhesive from various directions through the staggered guide channels, improving the uniformity and consistency of the adhesive supply pressure. The beveled ends of each protrusion connect the guide channels formed between adjacent protrusions in the area near the seal between the pressure plate body and the hot melt glue cylinder, thereby achieving adaptive adjustment of the pressure in the area between the pressure plate body and the adhesive surface to ensure the flatness of the pressure plate and further improve the stability of adhesive supply.

[0036] A transition block 30 is provided below the metering pump 29. The transition block 30 has an L-shaped liquid inlet channel 31 and an L-shaped liquid outlet channel 32. One end of the L-shaped liquid inlet channel 31 is connected to the liquid inlet 291 of the metering pump 29, and the other end extends to one side surface of the transition block 30 and is connected to the glue supply channel 331 on the glue supply block 33. The end of the glue supply channel 331 away from the L-shaped liquid inlet channel 31 is connected to the glue outlet hole 4 through a glue supply pipe 34. The other end of the L-shaped liquid outlet channel 32, which is connected to the liquid outlet 292 of the metering pump 29, extends to the other side surface of the transition block 30 and is connected to the glue inlet of the glue dispensing valve through a connecting block 35 with a connecting channel 351. At least one heating tube 36 is embedded in each of the transition block 30, the glue supply block 33, and the connecting block 35.

[0037] A glue inlet pressure sensor 16 is installed on the glue supply block 33, and a glue outlet pressure sensor 40 is installed on the adapter block 30. Both the glue inlet pressure sensor 16 and the glue outlet pressure sensor 40 include a body 41, a sensing unit 42 located at one end of the body 41, and a control unit 43 located at the other end of the body 41. The sensing unit 42 of the glue inlet pressure sensor 16 is connected to the glue supply channel 331 through a pipeline, and the sensing unit 42 of the glue outlet pressure sensor 40 is connected to the end of the L-shaped liquid outlet channel 32 near the connecting block 35 through a pipeline. Several metal fins 44 are provided on the outer side of the body 41 of the glue inlet pressure sensor 16 and the glue outlet pressure sensor 40 near the sensing unit 42.

[0038] Two pressure sensors are used to monitor the glue inlet and outlet pressures of the metering pump in real time to avoid abnormal glue supply pressure caused by glue blockage. Metal fins are installed between the sensing unit and the control unit of the pressure sensor to dissipate the heat conducted from the high-temperature glue in time to avoid damage or malfunction of the control unit due to high temperature interference.

[0039] The aforementioned metal fin 44 is an annular fin.

[0040] The aforementioned adapter block 30, glue supply block 33, and connecting block 35 are all stainless steel blocks.

[0041] A heating element 36 is embedded in the aforementioned adapter block 30 and connecting block 35. A heating element 36 is also embedded in the glue supply block 33 on both sides of the L-shaped liquid inlet channel 31 and the L-shaped liquid outlet channel 32.

[0042] The lower surfaces of the aforementioned diversion protrusions 10, 11, 12 and 13 are all flush.

[0043] The aforementioned heating rod 6 is equipped with 16 rods, with a total power of 32KW, which can achieve a maximum temperature rise of 250℃ within half an hour to facilitate temperature control.

[0044] The upper surface of the pressure plate body 1 has an upward protrusion 8. Several horizontally extending and parallel mounting holes 5 are provided on the side surface of the protrusion 8 and on both sides of the glue outlet hole 4.

[0045] The aforementioned mounting hole 5 is a through hole.

[0046] The hot melt adhesive cylinder 100 is positioned between two lifting cylinders 300.

[0047] The lower surface of the aforementioned movable plate 400 is connected to the upper surface of the pressure plate body 1 by two vertical connecting rods 500, so that the pressure plate body 1 can move vertically with the movable plate 400.

[0048] Example 2: A pressure plate type hot melt dispensing device, comprising: a carrier plate 200 for placing a hot melt glue cylinder 100, at least two lifting cylinders 300 vertically mounted on the upper surface of the carrier plate 200, a movable plate 400 connected between the upper ends of the piston rods of the lifting cylinders 300, a pressure plate body 1 connected to the movable plate 400 by at least two vertical connecting rods 500, and a metering pump 29 connected to the pressure plate body 1 and a dispensing valve respectively. The inlet 291 of the metering pump 29 is connected to the pressure plate body 1, and the outlet 292 of the metering pump 29 is connected to the glue inlet of the dispensing valve. A through-hole 4 is formed in the center of the pressure plate body 1. A plurality of mounting holes 5 are provided on the outer side of the pressure plate 4. A heating rod 6 is embedded in each mounting hole 5. The lower surface of the pressure plate body 1 gradually slopes downward in the radial outward direction along the pressure plate body 1. The lower surface of the pressure plate body 1 is provided with a plurality of first protrusions 11, second protrusions 12 and third protrusions 13, each extending radially along the pressure plate body 1. The thickness of each first protrusion 11, second protrusion 12 and third protrusion 13 gradually decreases in the radial outward direction along the pressure plate body 1, so that the lower surfaces of the first protrusions 11, second protrusions 12 and third protrusions 13 are flush and used for extrusion contact with the hot melt adhesive in the hot melt adhesive cylinder 100.

[0049] When in use, the pressure plate is preheated to about 100°C by the heating rod, and then the pressure plate is put into the hot melt adhesive barrel. The sealing ring on the pressure plate is pressed into contact with the inner wall of the hot melt adhesive barrel to achieve a seal between the two.

[0050] Initially, the adhesive inside the hot melt glue cartridge is solid;

[0051] First, remove the sealing rod on the vent hole, and move the pressure plate downward until the lower surfaces of the first, second, and third protrusions on it come into contact with the upper surface of the solid hot melt adhesive. During this process, the air between the pressure plate and the upper surface of the hot melt adhesive is discharged outward from the vent hole.

[0052] The heating element generates heat to raise the pressure plate to 150-160°C, with the specific temperature adjustable up to 250°C. The high-temperature pressure plate comes into contact with the solid hot melt adhesive. The adhesive remains at 150°C for half an hour, causing the top 10 cm of hot melt adhesive to melt into a flowable liquid. A certain pressure is maintained between the pressure plate and the liquid surface. When liquid adhesive overflows from the vent, a sealing rod is inserted to seal the vent. During the heating process, the thicker the protrusions are closer to the dispensing hole, which helps to concentrate the heat and accelerates the melting of the hot melt adhesive in the area around the dispensing hole.

[0053] Several first protrusions 11 are evenly spaced in the circumferential direction. Between any two adjacent first protrusions 11, there are two second protrusions 12 spaced in the circumferential direction. Between each second protrusion 12 and an adjacent first protrusion 11, there is a third protrusion 13. Between any two adjacent second protrusions 12, there is a diversion protrusion 10. The end face of each of the diversion protrusion 10, first protrusion 11, second protrusion 12 and third protrusion 13, whose lengths decrease sequentially, is flush with the outer circle of the pressure plate body 1. The circumference is flush, and the other end of the diversion protrusion 10 extends to the edge outside the glue outlet hole 4. A notch 14 is opened between the ends of the two second protrusions 12 on each diversion protrusion 10 and located on both sides of it near the glue outlet hole 4, so that the guide flow channel formed between each diversion protrusion 10 and the second protrusions 12 on both sides is interconnected. Each diversion protrusion 10, the first protrusion 11, the second protrusion 12 and the third protrusion 13 is provided with an inwardly inclined chamfered surface 15 at the lower part of the end face away from the glue outlet hole 4.

[0054] A transition block 30 is provided below the metering pump 29. The transition block 30 has an L-shaped liquid inlet channel 31 and an L-shaped liquid outlet channel 32. One end of the L-shaped liquid inlet channel 31 is connected to the liquid inlet 291 of the metering pump 29, and the other end extends to one side surface of the transition block 30 and is connected to the glue supply channel 331 on the glue supply block 33. The end of the glue supply channel 331 away from the L-shaped liquid inlet channel 31 is connected to the glue outlet hole 4 through a glue supply pipe 34. The other end of the L-shaped liquid outlet channel 32 is connected to the liquid outlet 292 of the metering pump 29, and extends to the other side surface of the transition block 30 and is connected to the glue inlet of the glue dispensing valve through a connecting block 35 with a connecting channel 351. At least one heating tube 36 is embedded in each of the transition block 30, the glue supply block 33, and the connecting block 35.

[0055] The hot melt adhesive, heated by the pressure plate, is injected from the inlet of the adhesive supply channel on the adhesive supply block. The adhesive enters the inlet of the metering pump through the L-shaped inlet channel, and then passes through the L-shaped outlet channel from the metering pump outlet, and finally enters the dispensing valve through the connecting channel on the connecting block. Throughout the entire process of adhesive flow, the adhesive is continuously heated by the heating tubes in each metal block to ensure that the hot melt adhesive always maintains a high temperature of about 150°C, thereby ensuring the fluidity of the adhesive.

[0056] A heating element 36 is embedded in the aforementioned adapter block 30 and connecting block 35. A heating element 36 is also embedded in the glue supply block 33 on both sides of the L-shaped liquid inlet channel 31 and the L-shaped liquid outlet channel 32.

[0057] The lower surfaces of the aforementioned diversion protrusions 10, 11, 12 and 13 are all arc-shaped.

[0058] A cover plate 7 is provided on the top of the pressure plate body 1 to shield the wiring of the heating rod and other structures to ensure safety and aesthetics.

[0059] The aforementioned adapter block 30, glue supply block 33, and connecting block 35 are all metal blocks.

[0060] The aforementioned adapter block 30 and adhesive supply block 33 are connected by a base plate 37.

[0061] A temperature sensor 38 is installed on the aforementioned adapter block 30 and on one side of the heating tube 36.

[0062] The aforementioned mounting hole 5 is a blind hole opened on the upper surface of the pressure plate body 1 and extending in the vertical direction.

[0063] The cover plate 7 and the pressure plate body 1 are fixedly connected by several bolts.

[0064] The upper surface of the cover plate 7 is provided with a through hole 71 that communicates with the glue outlet through hole 4.

[0065] The upper surface of the cover plate 7 and the pressure plate body 1 is provided with an air vent 91 that runs vertically through the outside of the glue outlet hole 4. The lower end of a sealing rod 92 is inserted into the two interconnected air vents 91 and is sealed to the air vents 91 by threads.

[0066] The lower end of the sealing rod 92 is set in a pointed cone shape, and the upper end of the sealing rod 92 is provided with a handle.

[0067] The aforementioned sealing groove 2 and sealing ring 3 are each provided in twos, and are spaced apart along the axial direction of the pressure plate body 1.

[0068] The aforementioned pressure plate body 1 includes a metal body and a high-temperature resistant coating applied to the surface of the metal body.

[0069] The metal body is aluminum, and the high-temperature resistant coating is a Teflon coating.

[0070] The upper side wall of the dispensing valve 33 is provided with a first air pipe connector 351 and a second air pipe connector 352 that communicate with the interior of the dispensing valve 33.

[0071] The working principle of this invention is as follows:

[0072] When in use, the pressure plate is preheated to about 100°C by the heating rod, and then the pressure plate is put into the hot melt adhesive barrel. The sealing ring on the pressure plate is pressed into contact with the inner wall of the hot melt adhesive barrel to achieve a seal between the two.

[0073] Initially, the adhesive inside the hot melt glue cartridge is solid;

[0074] First, remove the sealing rod on the vent hole, and move the pressure plate downward until the lower surfaces of the first, second, and third protrusions on it come into contact with the upper surface of the solid hot melt adhesive. During this process, the air between the pressure plate and the upper surface of the hot melt adhesive is discharged outward from the vent hole.

[0075] The heating element generates heat to raise the pressure plate to 150-160°C, with the specific temperature adjustable up to 250°C. The high-temperature pressure plate comes into contact with the solid hot melt adhesive. The adhesive remains at 150°C for half an hour, causing the top 10 cm of hot melt adhesive to melt into a flowable liquid. A certain pressure is maintained between the pressure plate and the liquid surface. When liquid adhesive overflows from the vent, a sealing rod is inserted to seal the vent. During the heating process, the thicker the protrusions are closer to the dispensing hole, which helps to concentrate the heat and accelerates the melting of the hot melt adhesive in the area around the dispensing hole.

[0076] The continuous downward pressure of the pressure plate causes the molten adhesive in the glue tank to be continuously discharged from the dispensing hole, thus ensuring a continuous supply of adhesive to subsequent dispensing valves. During this process, the liquid adhesive, guided by the inclined lower surface of the pressure plate body, quickly converges towards the area around the dispensing hole to ensure efficient adhesive supply. This also improves the sealing performance between the pressure plate body and the hot melt glue cylinder, effectively preventing adverse interference caused by adhesive overflow. Furthermore, the multiple guide channels formed between adjacent protrusions not only guide the direction of adhesive flow but also mix and equalize the adhesive from various directions through the staggered guide channels, improving the uniformity and consistency of the adhesive supply pressure. The beveled ends of each protrusion connect the guide channels formed between adjacent protrusions in the area near the seal between the pressure plate body and the hot melt glue cylinder, thereby achieving adaptive adjustment of the pressure in the area between the pressure plate body and the adhesive surface to ensure the flatness of the pressure plate and further improve the stability of adhesive supply.

[0077] The hot melt adhesive, heated by the pressure plate, is injected from the inlet of the adhesive supply channel on the adhesive supply block. The adhesive enters the inlet of the metering pump through the L-shaped inlet channel, and then passes through the L-shaped outlet channel of the metering pump and the connecting channel on the connecting block before finally entering the dispensing valve. Throughout the entire process of adhesive flow, the adhesive is continuously heated by the heating tubes in each metal block to ensure that the hot melt adhesive always maintains a high temperature of about 150°C, thereby ensuring the fluidity of the adhesive. The metering pump is purchased externally and is mainly used for metering and adding. It is not part of the invention of this patent and will not be described in detail here.

[0078] Two pressure sensors are used to monitor the glue inlet and outlet pressures of the metering pump in real time to avoid abnormal glue supply pressure caused by glue blockage. Metal fins are installed between the sensing unit and the control unit of the pressure sensor to dissipate the heat conducted from the high-temperature glue in time to avoid damage or malfunction of the control unit due to high temperature interference.

[0079] When using the aforementioned pressure plate type hot melt dispensing device, it can both transfer the heat generated by the heating rod to the surface of the hot melt adhesive through the convex strip, rapidly heating the initially solid hot melt adhesive so that the heated and molten, fluid hot melt adhesive liquid can be discharged from the dispensing hole to achieve continuous adhesive supply; it can also accelerate the melting of the hot melt adhesive in the area around the dispensing hole and enable the fluid adhesive liquid to quickly gather in the area around the dispensing hole to ensure the efficiency of adhesive supply; it also improves the sealing performance between the pressure plate body and the hot melt adhesive cylinder, effectively avoiding adverse interference caused by adhesive overflow; furthermore, it not only guides the direction of adhesive flow, but also mixes and equalizes the adhesive liquid from various directions through staggered guide channels to improve the uniformity and consistency of the adhesive supply pressure; and it can also... By connecting the guide channels formed between adjacent protrusions through the beveled surface at the end of each protrusion in the area near the seal between the pressure plate body and the hot melt adhesive cylinder, adaptive adjustment of the pressure in the area between the pressure plate body and the adhesive surface can be achieved to ensure the flatness of the pressure plate, thereby further improving the stability of adhesive supply. In addition, hot melt adhesive can be used to shorten the curing time after dispensing, thus saving workshop space occupied in the photovoltaic glass processing. The adhesive can also be heated in real time during the entire process of supplying adhesive to the dispensing valve to ensure the fluidity of the hot melt adhesive, thereby ensuring the accuracy and effect of dispensing. The inlet and outlet pressures of the metering pump can also be monitored in real time to avoid abnormal adhesive supply pressure caused by adhesive circuit blockage, and the sensor can be effectively prevented from being damaged by excessive adhesive temperature.

[0080] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A pressure plate type hot melt dispensing device, comprising: A carrier plate (200) for placing a hot melt glue cylinder (100), at least two lifting cylinders (300) vertically mounted on the upper surface of the carrier plate (200), a movable plate (400) connected between the upper ends of the piston rods of the lifting cylinders (300), a pressure plate body (1) connected to the movable plate (400) by at least two vertical connecting rods (500), a metering pump (29), and a dispensing valve (33) are provided. The pressure plate body (1), whose side surface is sealed to the inner wall of the hot melt glue cylinder (100), has a vertically penetrating glue outlet hole (4) in the center. This glue outlet hole (4) is connected to the inlet (291) of the metering pump (29) through a pipeline. The outlet (292) of the metering pump (29) is connected to the inlet (34) of the dispensing valve (33). The characteristic is that the pressure plate body (1) is located on and located on the upper surface of the carrier plate (200). A number of mounting holes (5) are provided on the outside of the glue outlet hole (4). A heating rod (6) is embedded in each mounting hole (5). The lower surface of the pressure plate body (1) gradually slopes downward in the direction of radial outward of the pressure plate body (1). The lower surface of the pressure plate body (1) is provided with a number of first protrusions (11), second protrusions (12) and third protrusions (13) that each extend radially along the pressure plate body (1). The thickness of each of the first protrusions (11), second protrusions (12) and third protrusions (13) gradually decreases in the direction of radial outward of the pressure plate body (1), so that the lower surfaces of the first protrusions (11), second protrusions (12) and third protrusions (13) are flush and used to make extrusion contact with the hot melt adhesive in the hot melt glue cylinder (100). Several first protrusions (11) are evenly spaced in the circumferential direction. Between any two adjacent first protrusions (11), there are two second protrusions (12) spaced in the circumferential direction. Between each second protrusion (12) and an adjacent first protrusion (11), there is a third protrusion (13). Between any two adjacent second protrusions (12), there is a diversion protrusion (10). The end face of each of the diversion protrusion (10), first protrusion (11), second protrusion (12) and third protrusion (13), whose lengths decrease sequentially, is aligned with the outer circumference of the pressure plate body (1). The surfaces are flush, and the other end of the diversion protrusion (10) extends to the edge outside the glue outlet hole (4). A notch (14) is opened between the ends of the two second protrusions (12) on each diversion protrusion (10) and the two second protrusions (12) on both sides of it, so that the guide flow channel formed between each diversion protrusion (10) and the second protrusions (12) on both sides is interconnected. Each diversion protrusion (10), first protrusion (11), second protrusion (12) and third protrusion (13) has an inwardly inclined chamfer (15) at the lower part of the end face away from the glue outlet hole (4). A transition block (30) is provided below the metering pump (29). An L-shaped inlet channel (31) and an L-shaped outlet channel (32) are respectively provided on the transition block (30). One end of the L-shaped inlet channel (31) is connected to the inlet (291) of the metering pump (29), and the other end extends to one side surface of the transition block (30) and is connected to the glue supply channel (331) on a glue supply block (33). The end of the glue supply channel (331) away from the L-shaped inlet channel (31) is connected to the outlet channel (32). The L-shaped liquid outlet channel (32), which is connected to the dispensing through hole (4) via a glue supply tube (34) and one end is connected to the liquid outlet (292) of the metering pump (29), extends to the other side surface of the adapter block (30) and is connected to the glue inlet (34) of the dispensing valve (33) via a connecting block (35) with a connecting channel (351). At least one heating tube (36) is embedded in each of the adapter block (30), the glue supply block (33) and the connecting block (35).

2. The pressure plate type hot melt dispensing device according to claim 1, characterized in that: A glue inlet pressure sensor (16) is installed on the glue supply block (33), and a glue outlet pressure sensor (40) is installed on the adapter block (30). Both the glue inlet pressure sensor (16) and the glue outlet pressure sensor (40) include a body (41), a sensing unit (42) located at one end of the body (41), and a control unit (43) located at the other end of the body (41). The sensing unit (42) of the glue inlet pressure sensor (16) is connected to the glue supply channel (331) through a pipeline. The sensing unit (42) of the glue outlet pressure sensor (40) is connected to the end of the L-shaped liquid outlet channel (32) near the connecting block (35) through a pipeline. Several metal fins (44) are provided on the outer side of the body (41) of the glue inlet pressure sensor (16) and the glue outlet pressure sensor (40) near the sensing unit (42).

3. The pressure plate type hot melt dispensing device according to claim 2, characterized in that: The metal fin (44) is an annular fin.

4. The pressure plate type hot melt dispensing device according to claim 1, characterized in that: The adapter block (30), glue supply block (33), and connecting block (35) are all stainless steel blocks.

5. The pressure plate type hot melt dispensing device according to claim 1, characterized in that: A heating element (36) is embedded in the adapter block (30) and the connecting block (35), and a heating element (36) is embedded in the glue supply block (33) on both sides of the L-shaped liquid inlet channel (31) and the L-shaped liquid outlet channel (32).

6. The pressure plate type hot melt dispensing device according to claim 1, characterized in that: The lower surfaces of the diversion protrusion (10), the first protrusion (11), the second protrusion (12) and the third protrusion (13) are all flush.

7. The pressure plate type hot melt dispensing device according to claim 6, characterized in that: The lower surfaces of the diversion protrusion (10), the first protrusion (11), the second protrusion (12) and the third protrusion (13) are all arc-shaped surfaces.

8. The pressure plate type hot melt dispensing device according to claim 1, characterized in that: The heating rod (6) is provided with 16 rods.

9. The pressure plate type hot melt dispensing device according to claim 1, characterized in that: The upper surface of the pressure plate body (1) has an upward protrusion (8), and several horizontally extending and parallel mounting holes (5) are provided on the side surface of the protrusion (8) and on both sides of the glue outlet hole (4).

10. The pressure plate type hot melt dispensing device according to claim 1, characterized in that: A cover plate (7) is provided on the top of the pressure plate body (1).

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