Stable hot melt adhesive plunger pump

Abstract

The utility model discloses a stable type hot melt adhesive plunger pump which comprises a vertically arranged air cylinder, an adhesive taking cylinder sleeve of which the upper end is connected with a cylinder body part of the air cylinder, and a pressure plate which is arranged under the adhesive taking cylinder sleeve, and the lower end of an upper link shaft which is vertically arranged at the lower end of a piston rod of the air cylinder penetrates into the adhesive taking cylinder sleeve; the lower end of an upper linkage shaft with the upper end connected with a piston rod of the air cylinder is connected with a lower linkage shaft through a connecting rod, a glue taking spoon capable of extending into a glue outlet through hole of the pressing disc is installed on the vertically-extending lower linkage shaft, the glue outlet is connected with the glue dispensing valve through a glue supply pipe, and the outer side of the glue supply pipe is sleeved with a spring. The inner wall of the spring is in extrusion contact with the outer circumferential surface of the glue supply pipe. On the basis of realizing continuous and high-precision outward glue supply, a certain degree of freedom of the glue supply pipe can be kept, and the glue supply pipe has certain stiffness, so that the influence on the flow velocity and pressure of a glue solution in the glue supply pipe caused by bending deformation of the glue supply pipe due to over-high temperature of the hot melt glue solution is avoided, and the stability and consistency of glue supply flow parameters are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of glue supply, in particular to a stable hot melt adhesive plunger pump. Background Art

[0002] Hot melt adhesive is a kind of plastic adhesive. The hot melt adhesive in solid state at normal temperature can melt into a liquid with fluidity at a certain temperature, and the hot melt adhesive can be transported to a dispensing device by a plunger pump for dispensing after heating. The plunger pumps in the prior art usually need to supply glue continuously and with high precision. The glue outlet is usually connected to the dispensing device by a glue supply pipe. Selecting a pipe with a certain hardness can withstand the hot melt adhesive with too high temperature, but it lacks freedom. If a soft pipe is selected, it is easy to cause the glue supply pipe to bend and deform due to the too high temperature of the hot melt adhesive, affecting the flow rate and pressure of the glue liquid. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a stable hot melt adhesive plunger pump. On the basis of realizing continuous and high-precision external glue supply, the stable hot melt adhesive plunger pump can not only maintain a certain degree of freedom of the glue supply pipe, but also has a certain stiffness to avoid the glue supply pipe from bending and deforming due to the too high temperature of the hot melt adhesive liquid, thereby affecting the flow rate and pressure of the glue liquid in it, and ensuring the stability and consistency of the glue supply flow parameters.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is: a stable hot melt adhesive plunger pump, including: a vertically arranged air cylinder, a glue taking cylinder sleeve connected to the cylinder body part of the air cylinder at the upper end, and a pressing plate arranged directly below the glue taking cylinder sleeve. The lower end of an upper connecting shaft vertically installed at the lower end of the piston rod of the air 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 at the center of the upper surface of the pressing plate. A glue outlet is opened on the side wall of the upper end of the glue taking cylinder sleeve communicating with the glue outlet through hole on the lower end. A sealing assembly is arranged between the glue outlet and above, 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 air cylinder is connected to 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 a 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.

[0005] The further improved solutions in the above technical solutions are as follows:

[0006] 1. In the above solution, the glue supply pipe further includes a tubular body and a heat preservation sheath layer coated outside the tubular body, and the spring is in pressing contact with the heat preservation sheath layer.

[0007] 2. In the above solution, a one-way valve, a glue shut-off valve, and a pressure sensor are provided between the other end of the glue supply pipe connected to the dispensing valve at one end and the glue outlet of the glue taking cylinder sleeve.

[0008] 3. In the above solution, it is characterized in that: a heating module is sleeved outside the glue taking cylinder sleeve and located between the glue outlet and the pressure plate.

[0009] 4. In the above solution, a round nut is sleeved outside the upper end of the glue taking cylinder sleeve. Below the round nut threadedly connected to the glue taking cylinder sleeve and outside the glue taking cylinder sleeve, a fixing plate is sleeved. The lower surface of the round nut abuts against the upper surface of the fixing plate. The fixing plate is connected to the support plate through at least two vertically arranged positioning columns.

[0010] 5. In the above solution, a glue passing sleeve is hermetically connected to the lower end of the glue taking cylinder sleeve and above the glue taking spoon. The lower end of the glue passing sleeve with a sealing plate at the upper end is hermetically connected to a glue sucking cylinder. The lower end of the glue sucking cylinder is embedded in the glue outlet through hole on the pressure plate.

[0011] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art:

[0012] For the stable hot melt adhesive plunger pump of the present utility model, its glue outlet is connected to the dispensing valve through a glue supply pipe. A spring is sleeved outside the glue supply pipe. 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, on the basis of realizing continuous and high-precision outward glue supply through the cooperation of the pressure plate and the glue taking spoon, it can not only maintain a certain degree of freedom of the glue supply pipe, but also have a certain stiffness to avoid the bending deformation of the glue supply pipe caused by 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; moreover, a heating module is sleeved outside the glue taking cylinder sleeve and located between the glue outlet and the pressure plate, which can continuously heat the hot melt adhesive entering the glue taking cylinder sleeve to ensure that the hot melt adhesive always has good fluidity, thereby ensuring the continuity of glue supply and the consistency of glue output. Brief Description of the Drawings

[0013] Att Figure 1 is a schematic structural diagram of the stable hot melt adhesive plunger pump of the present utility model;

[0014] Att Figure 2 is a schematic partial structural diagram of the stable hot melt adhesive plunger pump of the present utility model;

[0015] Att Figure 3 is for the present utility model Att Figure 2 partial structural sectional view;

[0016] Att Figure 4 is for the present utility model Att Figure 3Enlarged schematic view at position A;

[0017] Appendix Figure 5 This is the appendix of the present utility model Figure 3 Enlarged schematic view at position B;

[0018] Appendix Figure 6 Partial structural schematic view of the stable hot melt adhesive plunger pump of the present utility model;

[0019] Appendix Figure 7 This is the appendix of the present utility model Figure 6 Cross-sectional schematic view along C-C in the present utility model.

[0020] In the above drawings: 1. Pressure plate; 2. Flange ring; 3. Gasket; 4. Glue outlet through hole; 5. Glue supply pipe; 6. Spring; 7. Connecting sleeve; 8. Check valve; 91. Air vent; 92. Sealing rod; 10. Glue shut-off valve; 11. Pressure sensor; 12. Glue inlet chamber; 13. Glue storage chamber; 14. Glue outlet chamber; 15. Glue outlet flow channel; 16. Retaining ring; 17. Lower nut; 171. First flange portion; 18. Movable part; 19. Movable sleeve; 191. Glue outlet hole; 20. Heating module; 21. Cylinder; 211. Cylinder body portion; 212. Piston rod; 22. Glue taking cylinder sleeve; 23. Sealing assembly; 24. Upper connecting shaft; 241. Stopping portion; 251. Round nut; 252. Fixed plate; 253. Positioning column; 254. Support plate; 26. Glue outlet; 27. Glue passing sleeve; 271. Sealing plate; 272. Glue passing through hole; 28. Glue suction cylinder; 281. Second flange portion; 29. Connecting rod; 291. Protrusion portion; 30. Lower connecting shaft; 31. Glue taking spoon. Detailed implementation manners

[0021] The following specific embodiments can further clearly understand this patent, but they do not limit this patent.

[0022] Embodiment 1: A stable hot melt adhesive plunger pump, comprising: a vertically arranged cylinder 21, a glue taking cylinder sleeve 22 whose upper end is connected to the cylinder body part 211 of the cylinder 21, and a pressure plate 1 arranged directly below the glue taking cylinder sleeve 22. 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 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. A glue outlet 26 is formed on the side wall of the upper end of the glue taking cylinder sleeve 22 communicating with the glue outlet through hole 4 on the pressure plate 1 at the lower end. A sealing assembly 23 is arranged between the upper part of the glue 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 pressure plate 1 is installed on the vertically extending lower connecting shaft 30. The glue outlet 26 is connected to a 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.

[0023] The above-mentioned glue supply pipe 5 further includes a tubular body and a heat preservation sheath layer coated on the outside of the tubular body, and the spring 6 is in pressing contact with the heat preservation sheath layer.

[0024] 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.

[0025] A heating module 20 is sleeved outside the glue taking cylinder sleeve 22 between the glue outlet 26 and the pressure plate 1.

[0026] During use, the pressure plate is moved downward to contact the liquid surface of the hot melt adhesive after heating. Then the cylinder is started, and the glue taking spoon is driven by the repeated pulling and pushing of the piston rod of the cylinder to continuously output the glue liquid in the glue outlet through hole from the glue outlet of the glue taking cylinder sleeve, and the glue liquid entering the glue taking cylinder sleeve is always kept in good fluidity under the heating of the heating module on its outside to ensure the continuity of glue output and the consistency of glue output volume.

[0027] A round nut 251 is sleeved outside the upper end of the glue taking cylinder sleeve 22. Below the round nut 251 threadedly connected to the glue taking cylinder sleeve 22, a fixing plate 252 is sleeved outside the glue taking cylinder sleeve 22. 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.

[0028] At the lower end of the above-mentioned glue-taking cylinder sleeve 22 and above the glue-taking spoon 31, a glue-passing sleeve 37 is hermetically connected. At the lower end of the glue-passing sleeve 37 with a sealing plate 371 at the upper end, a glue-sucking cylinder 38 is hermetically connected. The lower end of the glue-sucking cylinder 38 is embedded in the glue outlet through-hole 4 on the pressing plate 1.

[0029] On the upper surface of the above-mentioned pressing plate 1 and outside the glue outlet through-hole 4, a vertically penetrating air outlet hole 91 is provided. The lower end of a sealing rod 92 penetrates into the air outlet hole 91 and is hermetically connected to the air outlet hole 91 by threads.

[0030] The lower end of the above-mentioned sealing rod 92 is set to be a sharp cone shape, and a handle is provided at the upper end of the sealing rod 92.

[0031] Embodiment 2: A stable hot-melt adhesive plunger pump, comprising: a vertically arranged air cylinder 21, a glue-taking cylinder sleeve 22 with its upper end connected to the cylinder body part 211 of the air cylinder 21, and a pressing plate 1 arranged directly below the glue-taking cylinder sleeve 22. The lower end of an upper connecting shaft 24 vertically installed at the lower end of the piston rod 212 of the air cylinder 21 penetrates into the glue-taking cylinder sleeve 22. A glue outlet through-hole 4 communicating with the inner cavity of the glue-taking cylinder sleeve 22 is provided at the center of the upper surface of the pressing plate 1. An adhesive outlet 26 is provided 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 arranged above the adhesive 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 connected to the piston rod 212 of the air cylinder 21 at the upper end 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 adhesive outlet 26 is connected to a 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;

[0032] The glue is continuously and highly precisely supplied outward from the adhesive outlet through the cooperation of the pressing plate and the glue-taking spoon. When the glue 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 glue supply pipe from being bent and deformed, resulting in unsmooth glue liquid transportation and excessive pressure inside the pipe.

[0033] 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.

[0034] A one-way valve 7, a glue shut-off valve 8 and a pressure sensor 9 are arranged between the other end of the above-mentioned glue supply pipe 5 connected to the dispensing valve and the adhesive outlet 26 of the glue-taking cylinder sleeve 22.

[0035] The lower end of the above-mentioned glue-taking cylinder sleeve 22 is hermetically connected with a glue-passing sleeve 37 above the glue-taking spoon 31. The lower end of the glue-passing sleeve 37 with a sealing plate 371 at the upper end is hermetically connected with a glue-sucking cylinder 38. The lower end of the glue-sucking cylinder 38 is embedded in the glue outlet through-hole 4 on the pressing disc 1.

[0036] An active part 18 that can move in the vertical direction is arranged below the sealing plate 271 inside the above-mentioned glue-passing sleeve 27. The lower part of the active part 18 hermetically sleeved on the lower connecting shaft 30 can be hermetically connected with the upper end of the glue-sucking cylinder 28, so as to form a glue inlet chamber 12 among the glue-passing sleeve 27, the glue-sucking cylinder 28 and the active part 18. An active sleeve 19 is sleeved outside the connecting rod 29. A stop part 241 is arranged above the active sleeve 19 that can move in the vertical direction. The outer surface of the lower part of the active sleeve 19 is hermetically connected with the inner wall of the glue-taking cylinder sleeve 22, so as to form a glue storage chamber 13 between the lower part of the active sleeve 19 and the sealing plate 271 of the glue-passing sleeve 27. The lower part of the connecting rod 29 has a convex part 291 extending radially outwards. The lower end of the active sleeve 19 can be hermetically matched with the upper surface of the convex part 291, so as to form a glue outlet chamber 14 between the active sleeve 19 and the connecting rod 29. The glue inlet chamber 12 and the glue storage chamber 13 are communicated through a plurality of glue-passing through-holes 272 opened on the sealing plate 271. A glue outlet hole 191 communicated with the glue outlet chamber 14 is opened on the side wall of the upper part of the active sleeve 19. There is a glue outlet channel 15 between the glue outlet hole 191 and the glue outlet 26 on the glue-taking cylinder sleeve 22.

[0037] The above-mentioned stop part 241 is arranged at the lower part of the upper connecting shaft 24.

[0038] The upper surface of the convex part 291 on the above-mentioned connecting rod 29 is a tapered surface with an open lower end. The lower end of the active sleeve 19 is provided with an inner chamfered surface that can fit with the tapered surface.

[0039] A retaining ring 16 is arranged between the above-mentioned glue-passing sleeve 27 and the glue-sucking cylinder 28. The upper surface of the retaining ring 16 is hermetically connected with the lower end surface of the glue-passing sleeve 27 through an O-ring. The lower surface of the retaining ring 16 is hermetically connected with the upper end surface of the glue-sucking cylinder 28 through an O-ring. An inner chamfer is arranged at the upper end of the retaining ring 16, and the inner chamfered surface is in sealed contact with the active part 18.

[0040] A lower nut 17 is threadedly connected to the outer wall of the lower end of the above-mentioned glue-taking cylinder sleeve 22. The lower nut 17 is sleeved outside the glue-passing sleeve 27 and is hermetically connected with the outer wall of the glue-passing sleeve 27.

[0041] On the inner wall at the lower end of the lower nut 17, there is a first flange portion 171 extending radially inward. On the outer wall at the upper end of the glue suction cylinder 28, there is a second flange portion 281 extending radially outward. The lower surface of the second flange portion 281 is in lap contact with the upper surface of the first flange portion 171, and the outer surface of the second flange portion 281 is hermetically connected to the inner wall of the lower nut 17.

[0042] A connecting sleeve 7 is arranged between the lower nut 17 and the pressure plate 1 and outside the glue suction cylinder 28. The lower end of the connecting sleeve 7 is embedded in a flange ring 2 and hermetically connected to the inner wall of the flange ring 2. The flange ring 2 is bolted to the upper surface of the pressure plate 1, and the inner wall of the connecting sleeve 7 is hermetically connected to the outer wall of the glue suction cylinder 28.

[0043] A sealing gasket 3 is arranged between the flange ring 2 and the upper surface of the pressure plate body 1.

[0044] The working principle of the present utility model is as follows:

[0045] During use, the pressure plate is moved downward to contact the liquid-level of the hot-melt adhesive in a liquid state after heating. Then, the air cylinder is started, and the glue spoon is driven by the repeated pulling and pushing of the piston rod of the air cylinder to continuously output the glue liquid in the glue outlet hole outwards from the glue outlet of the glue cylinder sleeve. The glue liquid entering the glue cylinder sleeve always maintains good fluidity under the heating of the heating module on its outer side to ensure the continuity of glue output and the consistency of the glue output volume.

[0046] The glue liquid is continuously and highly precisely supplied outwards from the glue outlet through the cooperation of the pressure 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 degree of stiffness, avoiding the situation that the glue supply pipe is bent and deformed, resulting in unsmooth glue liquid transportation and too high pressure inside the pipe.

[0047] When the above-mentioned stable-type hot-melt adhesive plunger pump is adopted, through the support of the spring for the glue supply pipe, on the basis of realizing continuous and highly precise outward glue supply through the cooperation of the pressure plate and the glue spoon, it can not only maintain a certain degree of freedom of the glue supply pipe, but also have a certain degree of stiffness 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 therein, ensuring the stability and consistency of the glue supply flow parameters. It can also continuously heat the hot-melt adhesive entering the glue cylinder sleeve to ensure that the hot-melt adhesive always has good fluidity, thereby ensuring the continuity of glue supply and the consistency of the glue output volume.

[0048] The above embodiments are only for illustrating the technical concept and features of the present utility model, and the purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly. It should not be used to limit the protection scope of the present utility model. Any equivalent changes or modifications made according to the spirit and essence of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A stable hot melt adhesive plunger pump, comprising: A vertically arranged cylinder (21), a glue-taking cylinder sleeve (22) with its upper end connected to the cylinder body part (211) of the cylinder (21), and a pressure plate (1) arranged directly below the glue-taking cylinder sleeve (22), characterized in that: 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 with the inner cavity of the glue-taking cylinder sleeve (22) is opened at the center of the upper surface of the pressure plate (1), a glue outlet (26) is opened on the side wall of the upper end of the glue-taking cylinder sleeve (22) communicating with the glue outlet through hole (4) on the pressure plate (1) at the lower end, a sealing assembly (23) is arranged between the upper side of the glue 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) with its upper end connected to the piston rod (212) of the cylinder (21) is connected with 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 pressure plate (1) is installed on the vertically extending lower connecting shaft (30), the glue outlet (26) is connected with a 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).

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

3. The stable hot melt adhesive plunger pump according to claim 1, wherein: 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) with one end connected to the dispensing valve and the glue outlet (26) of the glue-taking cylinder sleeve (22).

4. The hot melt adhesive plunger pump according to any one of claims 1 to 3, characterized in that: A heating module (20) is sleeved outside the glue-taking cylinder sleeve (22) and between the glue outlet (26) and the pressure plate (1).

5. The stable hot melt adhesive plunger pump according to claim 1, wherein: A round nut (251) is sleeved outside the upper end of the glue-taking cylinder sleeve (22), a fixing plate (252) is sleeved outside the glue-taking cylinder sleeve (22) below the round nut (251) threadedly connected to the glue-taking cylinder sleeve (22), the lower surface of the round nut (251) is lapped with the upper surface of the fixing plate (252), and the fixing plate (252) is connected to a support plate (254) through at least two vertically arranged positioning columns (253).

6. The stable hot melt adhesive plunger pump according to claim 1, characterized in that: A glue-passing sleeve (37) is hermetically connected to the lower end of the glue-taking cylinder sleeve (22) and above the glue-taking spoon (31), a glue-sucking cylinder (38) is hermetically connected to the lower end of the glue-passing sleeve (37) with a sealing plate (371) at the upper end, and the lower end of the glue-sucking cylinder (38) is embedded into the glue outlet through hole (4) on the pressure plate (1).

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