Hot melt adhesive dispensing device

Abstract

The utility model discloses a hot melt adhesive dispensing device which comprises a movable plate connected between the upper ends of piston rods of a jacking air cylinder, a pressure plate connected with the movable plate through at least two vertical connecting rods, an adhesive dispensing valve provided with an adhesive outlet, and an adhesive taking cylinder sleeve of which the lower end is communicated with an adhesive outlet through hole in the pressure plate, the glue outlet is connected with the dispensing valve through a glue supply pipe, the outer side of the glue supply pipe is sleeved with a spring, the dispensing valve glue outlet communicated with the glue outlet of the glue taking cylinder sleeve is communicated with a dispensing head, the lower portion of the dispensing head is sleeved with a driven gear, and a driving gear meshed with the driven gear is in transmission connection with an output shaft of the motor. According to the utility model, a certain degree of freedom of the glue supply pipe can be kept, the glue supply pipe has certain hardness so as to avoid bending deformation of the glue supply pipe caused by over-high temperature, switching between continuous glue supply and glue supply stopping of the glue dispensing head is realized, meanwhile, rapid switching of the glue dispensing direction is realized, and the continuity and efficiency of glue dispensing are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hot melt adhesive dispensing, and particularly relates to a hot melt adhesive dispensing device. Background Art

[0002] Hot melt adhesive is a plastic adhesive. The hot melt adhesive in a solid state at normal temperature can melt into a liquid with fluidity at a certain temperature and can be dispensed using a dispensing device after heating. When the existing dispensing device supplies glue for hot melt adhesive, a flexible and bendable supply pipe is usually selected for freedom, but it is prone to bending and deformation due to the too high temperature of the hot melt adhesive. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a hot melt adhesive dispensing device, which can not only maintain a certain degree of freedom of the supply pipe, but also has a certain hardness to avoid the supply pipe from bending and deforming due to too high temperature, and can also realize the rapid switching of the dispensing direction, improving the continuity and efficiency of dispensing.

[0004] To solve the above technical problems, the technical solution adopted by the utility model is: a hot melt adhesive dispensing device, comprising: a carrier plate for placing a hot melt adhesive cylinder, at least two lifting cylinders vertically installed on the upper surface of the carrier plate, a movable plate connected to the upper ends of the piston rods of the lifting cylinders, a pressing plate connected to the movable plate through at least two vertical connecting rods, and a dispensing valve respectively provided with a glue inlet and a glue outlet. A sealing groove extending along the entire circumferential direction is provided on the side surface of the pressing plate, and a sealing ring is embedded in the sealing groove and protrudes from the side surface of the pressing plate. A cylinder that can move up and down with it is installed on the movable plate and above the pressing plate. A vertically extending glue taking cylinder sleeve is provided between the cylinder body of the cylinder and the pressing plate. The lower end of an upper connecting shaft vertically installed at the lower end of the piston rod of the cylinder penetrates into the glue taking cylinder sleeve. A glue outlet through hole communicating the hot melt adhesive cylinder with the inner cavity of the glue taking cylinder sleeve is provided at the center of the upper surface of the pressing plate whose side surface is in sealing fit with the inner wall of the hot melt adhesive cylinder;

[0005] A glue outlet is provided on the side wall of the upper end of the glue taking cylinder sleeve whose lower end is communicated with the glue outlet through hole on the pressing plate. A sealing assembly is provided above the glue outlet and between the glue taking cylinder sleeve and the upper connecting shaft. The lower end of the upper connecting shaft whose upper end is connected to the piston rod of the cylinder is connected with a lower connecting shaft through a connecting rod. A glue taking spoon that can extend into the glue outlet through hole of the pressing plate is installed on the vertically extending lower connecting shaft. The glue outlet is connected to the glue inlet of the dispensing valve through a supply pipe. A spring is sleeved outside the supply pipe, and the inner wall of the spring is in pressing contact with the outer circumferential surface of the supply pipe;

[0006] A dispensing head is installed at the glue outlet of the dispensing valve. The vertically extending dispensing head is rotatably installed on a substrate horizontally arranged below the dispensing valve through a bearing. A motor is installed on the upper surface of the substrate on one side of the dispensing valve. A driven gear is sleeved outside the dispensing head and below the substrate. The driving gear meshing with the driven gear is in transmission connection with the output shaft of the motor.

[0007] The further improved solutions in the above technical solutions are as follows:

[0008] 1. In the above solution, the glue supply pipe further includes a tubular body and a heat insulation sheath layer wrapped outside the tubular body. The spring is in pressing contact with the heat insulation sheath layer.

[0009] 2. In the above solution, the motor is installed on the upper surface of the substrate through a support seat. The lower end of the output shaft of the motor is connected with a rotating shaft through a coupling. The lower end of the rotating shaft passes through the substrate and installs the driving gear.

[0010] 3. In the above solution, the rotating shaft is rotatably connected with the support seat or the substrate through a bearing.

[0011] 4. In the above solution, an installation block is arranged between the dispensing valve and the substrate. The upper part of the dispensing head is embedded in an installation groove opened on the lower surface of the installation block and is rotatably and sealingly matched with the inner wall of the installation groove through at least two rotary sealing rings. An inlet hole is opened on the upper surface of the installation block. The upper end of the inlet hole communicated with the installation groove at the lower end is connected with the glue outlet of the dispensing valve.

[0012] 5. In the above solution, the installation block and the dispensing valve are sealingly connected through a sealing ring arranged outside the inlet hole.

[0013] Due to the application of the above technical solutions, the utility model has the following advantages compared with the prior art:

[0014] The hot melt adhesive dispensing device of the present utility model, the lower end of an upper connecting shaft vertically installed at the lower end of the piston rod of the cylinder penetrates into the glue taking cylinder sleeve. A glue outlet through hole communicating with the inner cavity of the glue taking cylinder sleeve is opened in the center of the upper surface of the pressure plate. An adhesive outlet is opened on the side wall of the upper end of the glue taking cylinder sleeve, which communicates with the glue outlet through hole on the pressure plate at the lower end. A sealing assembly is arranged between the upper part of the adhesive outlet and between the glue taking cylinder sleeve and the upper connecting shaft. The lower end of the upper connecting shaft connected to the piston rod of the cylinder at the upper end is connected with a lower connecting shaft through a connecting rod. A glue taking spoon that can extend into the glue outlet through hole of the pressure plate is installed on the vertically extending lower connecting shaft. The adhesive outlet is connected to the dispensing valve through a glue supply pipe. A spring is sleeved outside the glue supply pipe, and the inner wall of the spring is in pressing contact with the outer circumferential surface of the glue supply pipe. Through the support of the spring for the glue supply pipe, it can not only maintain a certain degree of freedom of the glue supply pipe, but also have a certain hardness to avoid the glue supply pipe being bent and deformed due to the too high temperature of the flowing hot melt adhesive liquid, which affects the flow rate and pressure of the glue liquid in it, and ensures the stability and consistency of the glue supply flow parameters; further, the glue inlet of the dispensing valve is communicated with the adhesive outlet of the glue taking cylinder sleeve, and the glue outlet of the dispensing valve is communicated with a dispensing head. The vertically extending dispensing head is rotatably installed on a substrate horizontally arranged below the glue inlet block of the dispensing valve through a bearing. A motor is installed on the upper surface of the substrate and on one side of the dispensing valve. A driven gear is sleeved outside the dispensing head and below the substrate. The driving gear meshing with the driven gear is in transmission connection with the output shaft of the motor, and the dispensing direction can be quickly switched by rotating the dispensing head, improving the continuity and efficiency of dispensing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG Figure 1 is a schematic diagram of the overall structure of the hot melt adhesive dispensing device of the present utility model;

[0016] FIG Figure 2 is a schematic diagram of the partial structure of the hot melt adhesive dispensing device of the present utility model Figure 1 ;

[0017] FIG Figure 3 is a schematic diagram of the structure of the pressure plate of the hot melt adhesive dispensing device of the present utility model;

[0018] FIG Figure 4 is a schematic diagram of the partial structure of the hot melt adhesive dispensing device of the present utility model Figure 2 ;

[0019] FIG Figure 5 is a schematic diagram of the partial structure of the hot melt adhesive dispensing device of the present utility model Figure 3 ;

[0020] FIG Figure 6 is a schematic cross-sectional view of the present utility model along A-A in FIG Figure 5 ;

[0021] FIG Figure 7 is a schematic diagram of the present utility model in FIGFigure 6 Enlarged schematic view at position B in the middle

[0022] Appendix Figure 8 Partial structural schematic diagram of the hot melt adhesive dispensing device of the present utility model Figure 4 .

[0023] In the above drawings: 100, hot melt adhesive cylinder; 200, carrier plate; 300, lifting cylinder; 400, movable plate; 500, vertical connecting rod; 1, pressure plate; 2, sealing groove; 3, sealing ring; 4, glue outlet through hole; 5, glue supply pipe; 6, spring; 7, one-way valve; 8, glue closing valve; 9, pressure sensor; 10, glue inlet; 11, dispensing valve; 12, dispensing head; 13, dispensing port; 17, bearing; 18, base plate; 191, driven gear; 192, driving gear; 20, motor; 21, cylinder; 211, cylinder body part; 212, piston rod; 22, glue taking cylinder sleeve; 23, sealing assembly; 24, upper connecting shaft; 251, round nut; 252, fixing plate; 253, positioning column; 254, support plate; 255, connecting block; 26, glue outlet; 27, connecting sleeve; 28, flange ring; 29, connecting rod; 30, lower connecting shaft; 31, glue taking spoon; 32, support seat; 33, coupling; 34, rotating shaft; 351, induction piece; 352, sensor; 36, mounting block; 361, mounting groove; 362, glue inlet hole; 37, rotating sealing ring; 38, limiting bracket. Detailed implementation manners

[0024] The present patent can be further clearly understood through the following specific embodiments given, but they do not limit the present patent.

[0025] Embodiment 1: A hot melt adhesive dispensing device, comprising: a carrier plate 200 for placing a hot melt adhesive cylinder 100, at least two lifting cylinders 300 vertically installed on the upper surface of the carrier plate 200, a movable plate 400 connected to the upper ends of the piston rods of the lifting cylinders 300, a pressure plate 1 connected to the movable plate 400 through at least two vertical connecting rods 500, and a dispensing valve 11 respectively provided with a glue inlet 10 and a glue outlet. A sealing groove 2 extending along the entire circumferential direction is formed on the side surface of the pressure plate 1, and a sealing ring 3 is embedded in the sealing groove 2 and protrudes from the side surface of the pressure plate 1. A cylinder 21 that can move up and down with it is installed above the pressure plate 1 on the movable plate 400. A vertically extending glue taking cylinder sleeve 22 is provided between the cylinder body part 211 of the cylinder 21 and the pressure plate 1. The lower end of an upper connecting shaft 24 vertically installed at the lower end of the piston rod 212 of the cylinder 21 penetrates into the glue taking cylinder sleeve 22, and a glue outlet through hole 4 communicating the inner cavity of the hot melt adhesive cylinder 100 with the inner cavity of the glue taking cylinder sleeve 22 is formed in the center of the upper surface of the pressure plate 1 whose side surface is in sealing fit with the inner wall of the hot melt adhesive cylinder 100;

[0026] A glue outlet 26 is provided on the side wall of the upper end of the glue cylinder sleeve 22 whose lower end is connected to the glue outlet through hole 4 on the pressure plate 1. A sealing assembly 23 is provided above the glue outlet 26 and between the glue cylinder sleeve 22 and the upper link shaft 24. The lower end of the upper link shaft 24 whose upper end is connected to the piston rod 212 of the cylinder 21 is connected to a lower link shaft 30 through a connecting rod 29. A glue spoon 31 that can be inserted into the glue outlet through hole 4 of the pressure plate 1 is installed on the vertically extending lower link shaft 30. The glue outlet 26 is connected to the glue inlet 10 of the glue dispensing valve through a glue supply hose 5. A spring 6 is sleeved on the outer side of the glue supply hose 5. The inner wall of the spring 6 is in extrusion contact with the outer circumference of the glue supply hose 5.

[0027] When supplying glue, the pressure plate and the glue spoon cooperate to supply the glue liquid continuously and accurately from the glue outlet. When the glue liquid passes through the glue supply pipe, the spring supports the glue supply pipe that is bent and deformed due to excessive temperature, so that the glue supply pipe can maintain a certain degree of freedom and have a certain degree of stiffness, avoiding the bending and deformation of the glue supply pipe, which may lead to unsmooth glue liquid delivery and excessive pressure in the pipe.

[0028] A dispensing head 12 is installed on the dispensing port of the dispensing valve 11. The vertically extending dispensing head 12 is rotatably installed on a substrate 18 horizontally arranged below the dispensing valve 11 through a bearing 17. A motor 20 is installed on the upper surface of the substrate 18 and located on one side of the dispensing valve 11. A driven gear 191 is sleeved on the outer side of the dispensing head 12 and located below the substrate 18. A driving gear 192 meshing with the driven gear 191 is drivingly connected to the output shaft of the motor 20.

[0029] When glue dispensing is required, the photovoltaic glass to be glued is placed horizontally under the glue dispensing head. Under the action of the three-axis drive mechanism, the glue dispensing head is first moved to a suitable height at a corner of the photovoltaic glass and the rectangular glue dispensing port of the glue dispensing head is parallel to one side of the photovoltaic glass. Then the three-axis drive mechanism drives the glue dispensing head to move along the length direction of the other side of the photovoltaic glass and opens the glue outlet of the glue dispensing valve while moving, thereby realizing the glue dispensing operation at the edge of one side of the photovoltaic glass.

[0030] The rubber supply hose 5 further comprises a tubular body and a thermal insulation sheath layer covering the outside of the tubular body, and the spring 6 is in extrusion contact with the thermal insulation sheath layer.

[0031] The motor 20 is mounted on the upper surface of the base plate 18 via a support seat 32 . The lower end of the output shaft of the motor 20 is connected to a rotating shaft 34 via a coupling 33 . The lower end of the rotating shaft 34 passes through the base plate 18 and is equipped with the driving gear 192 .

[0032] The rotating shaft 34 and the supporting seat 32 are rotatably connected via a bearing.

[0033] There is an installation block 36 arranged between the above-mentioned dispensing valve and the substrate 18. The upper part of the dispensing head 12 is embedded in an installation groove 361 opened on the lower surface of the installation block 36 and is rotatably and sealingly fitted with the inner wall of the installation groove 361 through at least two rotary sealing rings 37. An adhesive inlet hole 362 is opened on the upper surface of the installation block 36, and the upper end of the adhesive inlet hole 362 with the lower end communicating with the installation groove 361 is connected to the glue outlet of the dispensing valve.

[0034] The above-mentioned installation block 36 and the dispensing valve are sealingly connected through a sealing ring arranged outside the adhesive inlet hole 362.

[0035] An induction piece 351 that can rotate with it is installed on the above-mentioned rotating shaft 34, and a sensor 352 that cooperates with the induction piece 351 is installed on the support seat 32.

[0036] The diameter ratio of the above-mentioned driven gear 191 to the driving gear 192 is 2, and there are 2 sensors 352 which are spaced 180° in the circumferential direction.

[0037] The glue outlet 13 at the end of the above-mentioned dispensing head 12 opposite to the glue inlet block 2 of the dispensing valve is rectangular.

[0038] Embodiment 2: A hot melt adhesive dispensing device, comprising: a carrier plate 200 for placing a hot melt adhesive cylinder 100, at least two lifting cylinders 300 vertically installed on the upper surface of the carrier plate 200, a movable plate 400 connected to the upper ends of the piston rods of the lifting cylinders 300, a pressing plate 1 connected to the movable plate 400 through at least two vertical connecting rods 500, and a dispensing valve 11 respectively provided with a glue inlet 10 and a glue outlet. A sealing groove 2 extending along the entire circumferential direction is opened on the side surface of the pressing plate 1, and a sealing ring 3 is embedded in the sealing groove 2 and protrudes from the side surface of the pressing plate 1. A cylinder 21 that can move up and down with it is installed on the movable plate 400 and above the pressing plate 1. A glue taking cylinder sleeve 22 extending vertically is arranged between the cylinder body part 211 of the cylinder 21 and the pressing plate 1. The lower end of an upper connecting shaft 24 vertically installed at the lower end of the piston rod 212 of the cylinder 21 penetrates into the glue taking cylinder sleeve 22, and a glue outlet through hole 4 communicating the hot melt adhesive cylinder 100 with the inner cavity of the glue taking cylinder sleeve 22 is opened at the center of the upper surface of the pressing plate 1 whose side surface is sealingly fitted with the inner wall of the hot melt adhesive cylinder 100;

[0039] On the side wall of the upper end of the glue-taking cylinder sleeve 22 whose lower end communicates with the glue outlet through-hole 4 on the pressing plate 1, a glue outlet 26 is provided. Above the glue outlet 26 and between the glue-taking cylinder sleeve 22 and the upper connecting shaft 24, a sealing assembly 23 is provided. The lower end of the upper connecting shaft 24 whose upper end is connected to the piston rod 212 of the air cylinder 21 is connected to a lower connecting shaft 30 through a connecting rod 29. A glue-taking spoon 31 that can extend into the glue outlet through-hole 4 of the pressing plate 1 is installed on the vertically extending lower connecting shaft 30. The glue outlet 26 is connected to the glue inlet 10 of the dispensing valve through a glue supply pipe 5. A spring 6 is sleeved outside the glue supply pipe 5, and the inner wall of the spring 6 is in pressing contact with the outer circumferential surface of the glue supply pipe 5;

[0040] A dispensing head 12 is installed on the glue outlet of the dispensing valve 11. The vertically extending dispensing head 12 is rotatably installed on a substrate 18 horizontally arranged below the dispensing valve 11 through a bearing 17. A motor 20 is installed on the upper surface of the substrate 18 and on one side of the dispensing valve 11. A driven gear 191 is sleeved outside the dispensing head 12 and below the substrate 18. A driving gear 192 meshing with the driven gear 191 is in transmission connection with the output shaft of the motor 20;

[0041] Next, the rotation of the motor drives the driven gear meshing with the driving gear to rotate, so that the dispensing head rotates 90°. During this process, the glue outlet of the dispensing valve is closed;

[0042] Then, the dispensing head is driven by a three-axis driving mechanism to move along the length direction of the other side of the photovoltaic glass perpendicular to the side where the dispensing has been completed, and at the same time, the glue outlet gap of the dispensing valve is opened, so as to realize the dispensing operation at the edge of the other side of the photovoltaic glass;

[0043] Repeat this process to realize the continuous dispensing operation at the edges around the photovoltaic glass, improving the continuity and efficiency of dispensing.

[0044] The above-mentioned glue supply pipe 5 further includes a tubular body and a heat-insulating sheath layer coated on the outside of the tubular body. The spring 6 is in pressing contact with the heat-insulating sheath layer.

[0045] The above-mentioned rotating shaft 34 is rotatably connected to the substrate 18 through a bearing.

[0046] An installation block 36 is provided between the above-mentioned dispensing valve and the substrate 18. The upper part of the dispensing head 12 is embedded in an installation groove 361 opened on the lower surface of the installation block 36 and is rotatably and sealingly fitted with the inner wall of the installation groove 361 through at least 2 rotary sealing rings 37. An inlet hole 362 is opened on the upper surface of the installation block 36. The upper end of the inlet hole 362 whose lower end communicates with the installation groove 361 is connected to the glue outlet of the dispensing valve.

[0047] A one - way valve 7, a glue - closing valve 8 and a pressure sensor 9 are arranged between the other end of the glue supply pipe 5 connected to the dispensing valve at one end and the glue outlet 26 of the glue - taking cylinder sleeve 22.

[0048] A round nut 251 is sleeved on the outer side of the upper end of the above - mentioned glue - taking cylinder sleeve 22. Below the round nut 251 thread - connected to the glue - taking cylinder sleeve 22 and on the outer side of the glue - taking cylinder sleeve 22, a fixing plate 252 is sleeved. The lower surface of the round nut 251 abuts against the upper surface of the fixing plate 252, and the fixing plate 252 is connected to the support plate 254 through at least two vertically arranged positioning columns 253.

[0049] A connecting sleeve 27 is arranged between the above - mentioned glue - taking cylinder sleeve 22 and the pressing disc 1. The lower end of the connecting sleeve 27 is embedded in a flange ring 28 and is hermetically connected to the inner wall of the flange ring 28, and the flange ring 28 is connected to the upper surface of the pressing disc 1 by bolts.

[0050] A gasket is arranged between the above - mentioned flange ring 28 and the upper surface of the pressing disc body 1.

[0051] A limiting bracket 38 is installed on the surface of the above - mentioned movable plate 400 close to one side of the spring 6 and on the outer side of the spring 6.

[0052] The above - mentioned hot - melt adhesive cylinder 100 is arranged between two lifting cylinders 300.

[0053] The above - mentioned movable plate 400 is connected to the pressing disc body 1 through two vertical connecting rods 500 symmetrically arranged on both sides of the glue - taking cylinder sleeve 22, so that the pressing disc body 1 can move vertically with the movable plate 400.

[0054] A support plate 254 is installed on the lower surface of the cylinder body part 211 of the above - mentioned cylinder 21, and the support plate 254 is installed and connected to the two vertical connecting rods 500 through a connecting block 255 respectively.

[0055] A round nut 251 is sleeved on the outer side of the upper end of the above - mentioned glue - taking cylinder sleeve 22. Below the round nut 251 thread - connected to the glue - taking cylinder sleeve 22 and on the outer side of the glue - taking cylinder sleeve 22, a fixing plate 252 is sleeved. The lower surface of the round nut 251 abuts against the upper surface of the fixing plate 252, and the fixing plate 252 is connected to the support plate 254 through at least two vertically arranged positioning columns 253.

[0056] The working principle of the present utility model is as follows:

[0057] When supplying glue, the glue liquid is continuously and highly precisely supplied outward from the glue outlet through the cooperation of the pressing plate and the glue spoon. When the glue liquid passes through the glue supply pipe, the spring supports the glue supply pipe that is bent and deformed due to excessive temperature, so that the glue supply pipe can maintain a certain degree of freedom and also have a certain stiffness, avoiding the blockage of glue liquid transportation and excessive pressure inside the pipe caused by the bending and deformation of the glue supply pipe;

[0058] When dispensing glue is required, place the photovoltaic glass to be dispensed horizontally under the dispensing head. Under the action of the three-axis drive mechanism, first move the dispensing head to a suitable height at a corner of the photovoltaic glass and make the rectangular dispensing port of the dispensing head parallel to one side of the photovoltaic glass. Then, the three-axis drive mechanism drives the dispensing head to move along the length direction of the other side of the photovoltaic glass and opens the dispensing gap of the dispensing valve while moving, so as to realize the dispensing operation at the edge of one side of the photovoltaic glass;

[0059] Next, drive the driven gear meshing with the driving gear to rotate through the rotation of the motor, so that the dispensing head rotates 90°. During this process, close the dispensing port of the dispensing valve;

[0060] Then, drive the dispensing head to move along the length direction of the other side perpendicular to the side where the dispensing has been completed of the photovoltaic glass through the three-axis drive mechanism and open the dispensing gap of the dispensing valve while moving, so as to realize the dispensing operation at the edge of the other side of the photovoltaic glass;

[0061] Repeat this process to realize the continuous dispensing operation at the edges around the photovoltaic glass, improving the continuity and efficiency of dispensing.

[0062] When using the above hot melt adhesive dispensing device, its support for the glue supply pipe by the spring can not only maintain a certain degree of freedom of the glue supply pipe, but also have a certain hardness to avoid the bending and deformation of the glue supply pipe caused by the excessive temperature of the flowing hot melt adhesive liquid, which affects the flow rate and pressure of the glue liquid in it, and ensures the stability and consistency of the glue supply flow parameters; further, the rapid switching of the dispensing direction can be realized by the rotation of the dispensing head, improving the continuity and efficiency of dispensing.

[0063] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and its purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A hot melt adhesive dispensing device, comprising: A carrier plate (200) for placing a hot melt adhesive cartridge (100), at least two lifting cylinders (300) vertically installed 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 pressing plate (1) connected to the movable plate (400) through at least two vertical connecting rods (500), and a dispensing valve (11) respectively provided with a glue inlet (10) and a glue outlet. A sealing groove (2) extending in a circumferential direction is formed on the side surface of the pressing plate (1). A sealing ring (3) is embedded in the sealing groove (2) and protrudes from the side surface of the pressing plate (1). It is characterized in that: A cylinder (21) that can move up and down with it is installed above the pressing plate (1) on the movable plate (400). A glue-taking cylinder sleeve (22) extending vertically is provided between the cylinder body part (211) of the cylinder (21) and the pressing plate (1). The lower end of an upper connecting shaft (24) vertically installed at the lower end of the piston rod (212) of the cylinder (21) penetrates into the glue-taking cylinder sleeve (22). A glue outlet through hole (4) communicating the hot melt adhesive cartridge (100) with the inner cavity of the glue-taking cylinder sleeve (22) is formed in the center of the upper surface of the pressing plate (1) whose side surface is in sealing fit with the inner wall of the hot melt adhesive cartridge (100). An outlet (26) is formed on the side wall of the upper end of the glue-taking cylinder sleeve (22) whose lower end communicates with the glue outlet through hole (4) on the pressing plate (1). A sealing assembly (23) is provided above the outlet (26) and between the glue-taking cylinder sleeve (22) and the upper connecting shaft (24). The lower end of the upper connecting shaft (24) whose upper end is connected to the piston rod (212) of the cylinder (21) is connected to a lower connecting shaft (30) through a connecting rod (29). A glue-taking spoon (31) that can extend into the glue outlet through hole (4) of the pressing plate (1) is installed on the vertically extending lower connecting shaft (30). The outlet (26) is connected to the glue inlet (10) of the dispensing valve through a glue supply pipe (5). A spring (6) is sleeved outside the glue supply pipe (5). The inner wall of the spring (6) is in pressing contact with the outer circumferential surface of the glue supply pipe (5). A dispensing head (12) is installed on the glue outlet of the dispensing valve (11). The vertically extending dispensing head (12) is rotatably installed on a substrate (18) horizontally arranged below the dispensing valve (11) through a bearing (17). A motor (20) is installed on the upper surface of the substrate (18) and on one side of the dispensing valve (11). A driven gear (191) is sleeved outside the dispensing head (12) and below the substrate (18). A driving gear (192) meshing with the driven gear (191) is in transmission connection with the output shaft of the motor (20).

2. The hot melt adhesive dispensing device according to claim 1, wherein: The glue supply pipe (5) further includes a tubular body and a heat-insulating sheath layer coated on the outside of the tubular body. The spring (6) is in pressing contact with the heat-insulating sheath layer.

3. The hot melt adhesive dispensing device according to claim 1, characterized in that: The motor (20) is mounted on the upper surface of the substrate (18) through a support base (32). The lower end of the output shaft of the motor (20) is connected to a rotating shaft (34) through a coupling (33). The lower end of the rotating shaft (34) passes through the substrate (18) and is provided with the driving gear (192).

4. The hot melt adhesive dispensing device according to claim 3, characterized in that: The rotating shaft (34) is rotatably connected to the support base (32) or the substrate (18) through a bearing.

5. The hot melt adhesive dispensing device according to claim 1, characterized in that: An installation block (36) is arranged between the dispensing valve and the substrate (18). The upper part of the dispensing head (12) is embedded in an installation groove (361) formed in the lower surface of the installation block (36) and is rotatably and sealingly matched with the inner wall of the installation groove (361) through at least two rotary seals (37). An adhesive inlet hole (362) is formed in the upper surface of the installation block (36). The upper end of the adhesive inlet hole (362) with the lower end communicating with the installation groove (361) is connected to the glue outlet of the dispensing valve.

6. The hot melt adhesive dispensing device according to claim 5, wherein: The installation block (36) and the dispensing valve are sealingly connected through a seal arranged outside the adhesive inlet hole (362).

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