Pressure overload safety protection device for hot melt adhesive machine

Abstract

The utility model discloses a hot melt adhesive machine pressure overload safety protection device, including overload protection mechanism, the one side of overload protection mechanism is equipped with the glue pipe, and the outside of glue pipe is equipped with the anti dry knot bushing, the end of glue pipe is equipped with hot melt adhesive machine head, and the bottom of hot melt adhesive machine head is installed with the nozzle, be equipped with the safety pipe on overload protection mechanism, and the inside of safety pipe is equipped with the containing space, and the protection piece is equipped in containing space simultaneously. This hot melt adhesive machine pressure overload safety protection device, when the pressure overload appears in the glue pipe, the overload pressure will act on the annular stress passage of safety sheet, and the safety sheet will be deformed or broken to release the overload pressure, avoid the damage of glue pipe, hot melt adhesive machine head and nozzle because of the pressure is too big, and the protection piece can be conveniently replaced through the handle of protection piece end part, and two groups of sealing pads can guarantee the sealing property of containing space, prevent hot melt adhesive leakage.

Description

Technical Field

[0001] This utility model relates to the field of hot melt glue machines, specifically a pressure overload safety protection device for hot melt glue machines. Background Technology

[0002] Hot melt glue machines are mainly used for automated applications of hot melt glue spraying, scraping, rolling, coating, and dispensing. They are widely used in household products (diapers, sanitary napkins, mousetraps, cockroach traps, and other disposable items). It is important to avoid operating hot melt glue machines near volatile or explosive materials or gases, and flammable and explosive materials should not be stored near the hot melt glue spraying equipment. However, semi-automatic operation of hot melt glue machines wastes time and reduces work efficiency. Existing fully automatic hot melt glue machines, when using large amounts of hot melt glue, may have glue particles that do not completely melt and enter the syringe, affecting the product's processing effect and requiring repeated coating. In severe cases, the syringe nozzle may become clogged, requiring manual cleaning, significantly reducing work efficiency and failing to meet current product requirements.

[0003] To solve the above problems, after searching, Chinese patent with announcement number CN207430619U was found, which discloses a fully automatic hot melt glue machine. The paper includes a device body, a power plug on the left side of the device body and the power plug being electrically connected to the device body, an aluminum alloy fixing rod on the right side of the power plug and the aluminum alloy fixing rod being welded to the device body, and a stainless steel guide rail on the top of the aluminum alloy fixing rod.

[0004] While the aforementioned devices can improve the quality of product processing, in actual use, the heating device heats the hot melt adhesive or hot melt material to a molten state. The molten material is then pumped into the nozzle component for uniform coating. Cooling residue will be generated inside the nozzle. If it is not cleaned in time after operation, the molten material will solidify and accumulate on the inner wall of the nozzle, causing the nozzle to become blocked. At this time, the pipeline used to transport the adhesive will be pressurized. If the pressure exceeds the tolerance limit, it will cause the pipeline joints to rupture and leak, and may also damage the seals of the adhesive pump. Utility Model Content

[0005] The purpose of this invention is to provide a pressure overload safety protection device for a hot melt glue machine to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, a pressure overload safety protection device for a hot melt glue machine is provided, including an overload protection mechanism. The overload protection mechanism has a glue inlet pipe on one side, and an anti-drying bushing is provided on the outside of the glue inlet pipe. A hot melt glue head is provided at the end of the glue inlet pipe, and a nozzle is installed at the bottom of the hot melt glue head. The overload protection mechanism is provided with a safety tube, and an accommodating space is opened inside the safety tube. A protective plate is provided in the accommodating space.

[0007] Furthermore, the safety tube is T-shaped, and its bottom is connected to the glue inlet tube via a flange.

[0008] Furthermore, the interior of the accommodating space is provided with two sets of sealing gaskets, and the sealing gaskets are annular, with the two sets of sealing gaskets covering the upper and lower sides of the protective sheet respectively.

[0009] Furthermore, the overload protection mechanism also includes a locking seat covering the safety tube, and a pressure plate is provided at the bottom of the locking seat. Both the pressure plate and the locking seat are circular.

[0010] Furthermore, the locking seat has a U-shaped cross-section and a slot inside, which is engaged with the top of the safety tube and fixed with bolts.

[0011] Furthermore, the bottom of the pressure plate is provided with a sealing gasket and a protective sheet, and multiple sets of perforations are equally spaced on both the pressure plate and the sealing gasket. The protective sheet is fixed inside the receiving space by the sealing gasket, the locking seat and the pressure plate.

[0012] Furthermore, the protective plate is circular, and a handle is fixed to the end of the protective plate. A safety sheet is provided on the protective plate, and the cross-section of the safety sheet is arc-shaped. Multiple sets of annular force channels are provided at equal intervals on the inner wall of the safety sheet, and the cross-section of the force channels is "V"-shaped.

[0013] Furthermore, the anti-caking bushing includes an insulating sleeve and a heating ring, with the heating ring spirally covering the outer ring surface of the glue inlet tube, while the insulating sleeve wraps around the outside of the heating ring.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In this solution, when an overload occurs in the glue inlet tube, the overload pressure will act on the annular force channel of the safety sheet, causing the safety sheet to deform or break to release the overload pressure; this prevents the glue inlet tube, hot melt glue head and nozzle from being damaged due to excessive pressure. The protective sheet can be easily replaced later through the handle at the end of the protective sheet. The two sets of sealing gaskets can ensure the sealing of the containment space and prevent hot melt glue leakage.

[0016] 2. This solution utilizes a spiral heating ring to achieve comprehensive and uniform contact with the outer surface of the glue inlet tube, enabling continuous and even heating of the glue inlet tube. This effectively maintains the molten state of the hot melt adhesive inside the tube, preventing the hot melt adhesive from cooling and drying due to temperature reduction and clogging the glue inlet tube. This ensures the smooth flow of the hot melt adhesive delivery channel, thereby ensuring stable spraying from the hot melt adhesive dispenser head and nozzle. The heat insulation sleeve wrapped around the outside of the heating ring reduces heat loss from the heating ring, improving heating efficiency and reducing energy consumption. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the adhesive inlet tube installation structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the installation of the overload protection mechanism of this utility model.

[0021] Figure 4 This is a schematic diagram of the anti-caking bushing structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the overload protection mechanism of this utility model.

[0023] Figure 6 This is a schematic diagram of the safety tube and its connection structure of this utility model;

[0024] Figure 7 This is a schematic diagram of the pressure plate and its connection structure of the present invention;

[0025] Figure 8 This is an exploded view of the overload protection mechanism of this utility model.

[0026] Figure 9 This is a three-dimensional structural diagram of the protective sheet of this utility model;

[0027] Figure 10 This is a top view of the structural protective sheet of this utility model.

[0028] The following labels are used in the diagram: 100, hot melt adhesive head; 200, nozzle; 300, glue inlet pipe; 400, overload protection mechanism; 41, safety tube; 42, receiving space; 43, sealing gasket; 44, locking seat; 441, pressure plate; 45, protective plate; 451, handle; 452, safety film; 453, force channel; 500, anti-caking bushing; 51, heat insulation sleeve; 52, heating ring. Detailed Implementation

[0029] Please see Figures 1-10This utility model provides a pressure overload safety protection device for a hot melt glue machine, including an overload protection mechanism 400. The overload protection mechanism 400 has a glue inlet pipe 300 on one side, and an anti-drying bushing 500 on the outside of the glue inlet pipe 300. The end of the glue inlet pipe 300 is provided with a hot melt glue head 100, and a nozzle 200 is installed at the bottom of the hot melt glue head 100. The overload protection mechanism 400 is provided with a safety tube 41, and the inside of the safety tube 41 is provided with a receiving space 42. At the same time, a protective plate 45 is provided in the receiving space 42.

[0030] As a preferred embodiment, the safety tube 41 is T-shaped, and the bottom of the safety tube 41 is connected to the glue inlet tube 300 via a flange.

[0031] The interior of the accommodating space 42 is provided with two sets of sealing gaskets 43, and the sealing gaskets 43 are annular, with the two sets of sealing gaskets 43 covering the upper and lower sides of the protective sheet 45 respectively.

[0032] The overload protection mechanism 400 also includes a locking seat 44 covering the safety tube 41, and a pressure plate 441 is provided at the bottom of the locking seat 44. Both the pressure plate 441 and the locking seat 44 are circular.

[0033] The top of the locking seat 44 is equipped with a fixing flange for installing the recycling pipe, and the end of the recycling pipe is connected to the glue tank. The recycling pipe can be used for the recycling of spilled glue.

[0034] The locking seat 44 has a U-shaped cross section and a slot is provided inside the locking seat 44. The slot is engaged with the top of the safety tube 41 and fixed with bolts.

[0035] The bottom of the pressure plate 441 is provided with a sealing gasket 43 and a protective plate 45, and multiple sets of perforations are equally spaced on the pressure plate 441 and the sealing gasket 43. The protective plate 45 is fixed inside the receiving space 42 through the sealing gasket 43, the locking seat 44 and the pressure plate 441.

[0036] The protective plate 45 is circular, and a handle 451 is fixed at the end of the protective plate 45. A safety plate 452 is provided on the protective plate 45, and the cross-section of the safety plate 452 is arc-shaped. Multiple sets of annular force channels 453 are provided at equal intervals on the inner wall of the safety plate 452, and the cross-section of the force channel 453 is "V" shaped.

[0037] like Figure 9 and Figure 10As shown: The circular protective plate 45 can be adapted to the receiving space 42, sealing gasket 43, and pressure plate 441 to ensure sealing and stability after installation; the arc-shaped safety plate 452, in conjunction with the "V"-shaped annular force channel 453, can accurately sense pressure changes within the glue inlet tube 300. The "V"-shaped structure can concentrate force and reduce the trigger threshold of overload pressure, allowing the safety plate 452 to deform or break quickly to release pressure when pressure is overloaded, thus improving the sensitivity and response speed of overload protection; the handle 451 at the end allows operators to quickly disassemble and replace the protective plate 45 after overload protection is triggered, without the need for complicated tools, simplifying the maintenance process and improving equipment resumption efficiency; multiple sets of equidistantly distributed annular force channels 453 can ensure that the safety plate 452 is subjected to uniform force, ensuring the reliability of overload protection, and thus effectively protecting core components such as the glue inlet tube 300 and hot melt glue head 100 from damage.

[0038] Working principle: Hot melt adhesive is conveyed to the hot melt adhesive head 100 through the glue inlet pipe 300 and sprayed out through the nozzle 200 at the bottom. The anti-drying bushing 500 on the outside of the glue inlet pipe 300 can prevent the hot melt adhesive inside the pipe from cooling and drying to ensure smooth conveying. The overload protection mechanism 400 has a T-shaped safety tube 41 connected to the glue inlet pipe 300 through the bottom flange. The internal accommodating space 42 is equipped with a circular protective plate 45. The arc-shaped safety thin plate 452 on the protective plate 45 and the V-shaped annular force channels 453 evenly distributed on the inner wall can sense the pressure change inside the glue inlet pipe 300. The upper and lower sides of the protective plate 45 are covered with annular sealing gaskets 43. It is fixed inside the accommodating space 42 by a locking seat 44 with a U-shaped cross section, an internal slot, and a bolted locking seat 44, and a circular pressure plate 441 at its bottom.

[0039] When an overload occurs in the glue inlet tube 300, the overload pressure will act on the annular force channel 453 of the safety sheet 452, causing the safety sheet 452 to deform or break to release the overload pressure. At the same time, the glue inside the overload protection mechanism 400 can be recovered to the glue tank through the recovery tube installed on the top of the locking seat 44. This prevents the glue inlet tube 300, hot melt glue head 100 and nozzle 200 from being damaged due to excessive pressure. The protective sheet 45 can be easily replaced later through the handle 451 at the end of the protective sheet 45. The two sets of sealing gaskets 43 can ensure the sealing of the receiving space 42 and prevent hot melt glue leakage.

[0040] The above structure ensures stable delivery and spraying of hot melt adhesive, and also provides pressure overload protection through the overload protection mechanism 400 to prevent equipment damage. Meanwhile, the protective plate 45 is easy to replace, the sealing gasket 43 ensures the sealing of the device, and the anti-caking bushing 500 reduces the impact of hot melt adhesive drying on delivery, thus improving the overall operational stability, safety and service life of the device.

[0041] In a preferred embodiment, the anti-caking bushing 500 includes an insulating sleeve 51 and a heating ring 52, with the heating ring 52 spirally covering the outer ring surface of the glue inlet tube 300, while the insulating sleeve 51 wraps around the outside of the heating ring 52.

[0042] like Figure 4 As shown: The spiral heating ring 52 can form a complete and uniform contact with the outer ring surface of the glue inlet tube 300, which can continuously and evenly heat the glue inlet tube 300, effectively maintaining the molten state of the hot melt adhesive inside the tube, preventing the hot melt adhesive from cooling and drying due to temperature drop and clogging the glue inlet tube 300, ensuring the smoothness of the hot melt adhesive delivery channel, and thus ensuring the stable spraying of the hot melt adhesive head 100 and nozzle 200; The heat insulation sleeve 51 wrapped around the outside of the heating ring 52 can reduce the heat loss of the heating ring 52, improve heating efficiency, reduce energy consumption, and at the same time prevent the external environment from being affected by the high temperature of the heating ring 52, avoiding accidental burns to operators. The structure is simple and compact, does not occupy too much space, can fit tightly with the glue inlet tube 300, does not affect the overall layout and operation of the device, and further improves the reliability and safety of the equipment.

[0043] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A pressure overload safety protection device for a hot melt glue machine, comprising an overload protection mechanism (400), characterized in that: The overload protection mechanism (400) has an inlet pipe (300) on one side, and an anti-drying bushing (500) is provided on the outside of the inlet pipe (300). The end of the inlet pipe (300) is provided with a hot melt glue head (100), and a nozzle (200) is installed at the bottom of the hot melt glue head (100). The overload protection mechanism (400) is provided with a safety tube (41), and a receiving space (42) is opened inside the safety tube (41). At the same time, a protective plate (45) is provided in the receiving space (42).

2. The overload safety protection device for a hot melt adhesive machine according to claim 1, characterized in that: The safety tube (41) is T-shaped, and the bottom of the safety tube (41) is connected to the glue inlet tube (300) via a flange.

3. The pressure overload safety protection device for a hot melt adhesive machine according to claim 1, characterized in that: The interior of the accommodating space (42) is provided with two sets of sealing gaskets (43), and the sealing gaskets (43) are annular. The two sets of sealing gaskets (43) cover the upper and lower sides of the protective sheet (45) respectively.

4. The pressure overload safety protection device for a hot melt adhesive machine according to claim 1, characterized in that: The overload protection mechanism (400) also includes a locking seat (44) covering the safety tube (41), and a pressure plate (441) is provided at the bottom of the locking seat (44). Both the pressure plate (441) and the locking seat (44) are circular.

5. The pressure overload safety protection device for a hot melt adhesive machine according to claim 4, characterized in that: The locking seat (44) has a U-shaped cross section and a slot is provided inside the locking seat (44). The slot is fitted onto the top of the safety tube (41) and fixed with bolts.

6. The pressure overload safety protection device for a hot melt adhesive machine according to claim 4, characterized in that: The bottom of the pressure plate (441) is provided with a sealing gasket (43) and a protective plate (45), and multiple sets of perforations are equally spaced on the pressure plate (441) and the sealing gasket (43). The protective plate (45) is fixed inside the accommodating space (42) through the sealing gasket (43), the locking seat (44) and the pressure plate (441).

7. The pressure overload safety protection device for a hot melt adhesive machine according to claim 6, characterized in that: The protective plate (45) is circular, and a handle (451) is fixed at the end of the protective plate (45). A safety sheet (452) is provided on the protective plate (45), and the cross-section of the safety sheet (452) is arc-shaped. Multiple sets of annular force channels (453) are provided at equal intervals on the inner wall of the safety sheet (452), and the cross-section of the force channel (453) is "V".

8. The pressure overload safety protection device for a hot melt adhesive machine according to claim 1, characterized in that: The anti-caking bushing (500) includes an insulating sleeve (51) and a heating ring (52), with the heating ring (52) spirally covering the outer ring surface of the glue inlet tube (300), while the insulating sleeve (51) wraps around the outside of the heating ring (52).

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