A special glue melting device for hot melt adhesive with high viscosity and high softening point

Abstract

The present invention provides a special glue melting device for hot melt adhesive with high viscosity and high softening point, comprising a glue melting furnace body and a heating system; the heating system is deployed in the glue melting furnace body; the glue melting furnace body is provided with an upper glue melting area, a middle glue uniformizing area and a lower glue storage area from top to bottom; the upper glue melting area is provided with a melting knife assembly; the middle glue uniformizing area is provided with a transverse guide plate assembly; the lower glue storage area is provided with a diverter knife assembly and a vertical multi-wing guide assembly. The glue melting device is provided with an upper glue melting area, a middle glue uniformizing area and a lower glue storage area from top to bottom, the material block enters the upper glue melting area from the glue inlet, enters the middle glue uniformizing area after being sheared by the melting knife assembly, the transverse guide plate assembly in the middle glue uniformizing area statically stirs the glue to make the glue uniform, and the glue enters the lower glue storage area for storage. The glue melting device can achieve a glue melting amount of 0.75 to 1.5 kg / min under the control of the glue heating temperature of 180°C to 235°C.

Description

Technical Field

[0001] This invention relates to the field of hot melt adhesive production equipment technology, and in particular to a melting device specifically for hot melt adhesives with high viscosity and high softening point. Background Technology

[0002] In this new era of rapid technological development, my country's automotive industry has entered a period of technological leap forward, driven by new energy batteries, big data, and artificial intelligence, ushering in a new era of autonomous driving. Ensuring the safety of vehicle tires while in motion has thus become a crucial priority.

[0003] Currently, the basic method for protecting the safety of car tires during driving, both domestically and internationally, is to implant a puncture-resistant and leak-proof material into the inner bottom surface of the tire. When a foreign object punctures the tire while driving, it will not leak air or will leak only slightly, ensuring the car can continue to be driven. There are roughly three methods used domestically and internationally: 1. The material to be implanted is prepared as a liquid and injected into the tire's inflation layer through a valve to form a protective layer; 2. The material to be implanted is pre-coated onto a high-temperature resistant PET substrate to form an airtight layer material, replacing the original airtight layer material used in tire production. This material can be vulcanized simultaneously with the tire manufacturing process, forming a puncture-resistant and leak-proof protective layer after vulcanization; 3. The material to be implanted is placed in a specialized hot melt adhesive spraying machine, heated to melt the material, and then sprayed onto the inner bottom surface of the tire crown, forming a puncture-resistant and leak-proof protective layer with a thickness of 4mm-6mm.

[0004] Patent CN205570705U, published on September 14, 2016, discloses a thermally conductive hot melt adhesive machine. This machine includes an adhesive block made of a thermally conductive material, an annular cylinder disposed on the top surface of the adhesive block, and the annular cylinder and adhesive block forming an adhesive bucket. The adhesive block contains an adhesive path that draws hot melt adhesive from the bucket and distributes it to a hot melt adhesive spraying device. It also includes a heating device for heating the adhesive block, comprising a thermally conductive body bonded to the surface of the adhesive block and a heating element disposed within the thermally conductive body. This hot melt adhesive machine is the type commonly used in the aforementioned method three.

[0005] However, the characteristics of hot melt adhesives used in automotive tires for puncture resistance and leak prevention include: 1. High softening point, almost all between 110℃ and 160℃; 2. High heat distortion temperature, between 85℃ and 120℃; 3. High viscosity, between 12000mPa.s and 200000mPa.s. Currently, most conventional hot melt adhesive equipment on the market is borrowed from or referenced from equipment used in the packaging and footwear industries, which are suitable for hot melt adhesives with low softening points and low viscosity. As a result, the melting speed cannot keep up with the required dispensing speed. Therefore, in tire production, the melting temperature needs to be increased (around 240℃ to 260℃) and the heating time extended (3 to 5 hours) to ensure sufficient dispensing volume. However, prolonged exposure to high temperatures causes the hot melt adhesive to degrade, deteriorate, carbonize, and coke, resulting in uneven viscosity. This severely affects the quality of the adhesive, preventing tires coated with puncture-resistant and leak-proof hot melt adhesive from meeting the required puncture-proof and leak-proof quality. Furthermore, it often cannot support continuous processing. In particular, most melting equipment on the market currently has a melting capacity of only 20kg / 3h, which is inefficient. Increasing the melting capacity has been a long-standing demand in the industry. Therefore, the industry urgently needs a high-efficiency melting device specifically designed for high-viscosity, high-softening-point hot melt adhesives. Summary of the Invention

[0006] To address the current lack of a suitable melting device for high-viscosity, high-softening-point hot melt adhesives mentioned in the background art, this invention provides a melting device specifically for high-viscosity, high-softening-point hot melt adhesives, comprising a melting furnace body and a heating system; the heating system is deployed within the melting furnace body;

[0007] The glue melting furnace body is provided with an upper glue melting zone, a middle glue homogenizing zone and a lower glue storage zone from top to bottom; the glue inlet of the glue melting furnace body is located at the top of the upper glue melting zone; the glue outlet of the glue melting furnace body is located at the bottom of the lower glue storage zone.

[0008] The upper section of the melt zone is equipped with a melt-cutting blade assembly; the melt-cutting blade assembly is composed of several melt-cutting blades arranged side by side at intervals;

[0009] The middle section uniform adhesive zone is equipped with a transverse guide plate assembly;

[0010] The lower section of the rubber storage area is equipped with a flow divider assembly and a vertical multi-wing guide assembly; the flow divider assembly is composed of several flow dividers arranged side by side at intervals; the vertical multi-wing guide assembly is composed of vertical multi-wing guide blocks deployed between adjacent flow dividers;

[0011] The upper melting zone, the middle homogenizing zone, and the lower storage zone are all equipped with electric heating and electric heating temperature control functions.

[0012] Furthermore, the upper melting zone, the middle uniforming zone, and the lower storage zone are all equipped with electric heating devices; the electric heating devices and the heating system are electrically connected to each other.

[0013] Furthermore, the transverse guide plate assembly consists of at least three layers of grid plates.

[0014] Furthermore, the electric heating device is an infrared heating device;

[0015] Both the melting and cutting blade and the diverting blade are provided with several through holes;

[0016] Several heating devices are embedded between the layers of the transverse guide plate assembly; each heating device is provided with several through-holes.

[0017] The infrared heating device is placed inside the penetration hole.

[0018] Furthermore, the internal dimensions of the melting furnace body include:

[0019] The length is 40mm×n+20mm×(n-1)+40mm, where n represents the number of melting and cutting blades;

[0020] Width is 450–500 mm;

[0021] The depth is 760-790 mm.

[0022] Furthermore, the cutting edge of the welding cutter is at a 30-degree angle; the two long sides of the welding cutter are respectively provided with several П-shaped adhesive grooves;

[0023] The length of the melting and cutting blade is the same as the internal width of the melting furnace body; the blade width W1 of the melting and cutting blade is 40mm, and the blade thickness B1 is 20mm; the distance between adjacent melting and cutting blades is 20mm.

[0024] Furthermore, the cutting edge of the flow divider is at a 30-degree angle; the two long sides of the flow divider are respectively provided with several П-shaped adhesive grooves;

[0025] The length of the diverting blade is the same as the internal width of the melting furnace body; the blade width W2 of the diverting blade is 40mm and the blade thickness B2 is 20mm; the spacing between adjacent diverting blades is 20mm; the number of diverting blades is one less than the number of melting and cutting blades.

[0026] Furthermore, the height of the vertical multi-wing guide block is 5mm to 10mm smaller than the height of the flow divider.

[0027] Furthermore, the length of the vertical multi-wing guide block is the same as the internal width of the melting furnace body; the width of the vertical multi-wing guide block is 18mm.

[0028] Furthermore, the vertical multi-wing guide block includes axial guide vanes and radial guide vanes; the radial guide vanes are arranged in parallel on the axial guide vanes; the radial guide vanes are at right angles to the axial guide vanes.

[0029] Compared with the prior art, the melting device provided by the present invention has the following advantages:

[0030] 1. The traditional single-structure model of the glue melting furnace has been changed to a three-section structure with different functions: the upper section is the glue melting zone, which is used to quickly melt and cut solid hot melt glue blocks at room temperature into the middle layer; the middle section is the glue homogenizing zone, which is used to refine and mix the glue falling from the upper layer through the guide plate to achieve a uniform viscosity of the glue liquid; the lower section is the glue storage zone, which is used to statically stir the glue liquid that has achieved a uniform viscosity in the middle section to make the viscosity of the glue liquid completely uniform before use.

[0031] 2. The heat conduction structure of the traditional hot melt adhesive oven has been changed. The single bottom and outer side electric heating method has been changed to a uniformly distributed internal electric heating method, increasing the heat exchange area by 6 to 8 times, which significantly shortens the melting time.

[0032] 3. The uniquely designed hot-cutting blade assembly and static stirring structure allow for fuller utilization of thermal conductivity compared to conventional hot melt adhesive melting equipment. This ensures that the temperature and viscosity of the molten hot melt adhesive remain consistent throughout the furnace after flowing through the assembly.

[0033] 4. The control method of electric heating in hot melt adhesive ovens has been changed from the previous single fully open or fully closed temperature control to a three-stage independent temperature control. The heating system is set up with main heating temperature control and auxiliary heating temperature control, which improves temperature control accuracy and saves energy.

[0034] Through the comprehensive coordination of the above four aspects, a melting device suitable for continuously and efficiently melting hot melt adhesives with high softening point, high heat distortion temperature, and high viscosity has been designed. This melting device can achieve a melting rate of 0.75–1.5 kg / min under a controlled heating temperature of 180℃–235℃ (temperature can be adjusted according to the physical properties of different hot melt adhesives). Compared to current melting devices of similar size, this represents a surprisingly significant improvement in melting capacity. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the internal structure of the melting device provided by the present invention;

[0037] Figure 2 This is a cross-sectional view of the welding cutter;

[0038] Figure 3 This is a vertical sectional view of the welding cutter;

[0039] Figure 4 This is a cross-sectional view of the flow divider.

[0040] Figure 5 This is a vertical sectional view of the flow divider.

[0041] Figure 6 This is a schematic diagram of a vertical multi-blade guide block.

[0042] Figure label:

[0043] Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] This invention provides a melting device for high-viscosity, high-softening-point hot melt adhesives, comprising a melting furnace body 10 and a heating system; the heating system is deployed within the melting furnace body 10.

[0047] The glue melting furnace body 10 is provided with an upper glue melting zone 11, a middle glue homogenizing zone 12 and a lower glue storage zone 13 from top to bottom; the glue inlet of the glue melting furnace body 10 is located at the top of the upper glue melting zone 11; the glue outlet of the glue melting furnace body 10 is located at the bottom of the lower glue storage zone 13.

[0048] The upper section of the melt zone 11 is provided with a melt-cutting blade assembly; the melt-cutting blade assembly is composed of a plurality of melt-cutting blades 21 arranged at intervals;

[0049] The middle section uniform adhesive zone 12 is equipped with a transverse guide plate assembly;

[0050] The lower section of the rubber storage area 13 is provided with a flow divider assembly and a vertical multi-wing guide assembly; the flow divider assembly is composed of a plurality of flow dividers 41 arranged at intervals; the vertical multi-wing guide assembly is composed of vertical multi-wing guide blocks 51 deployed between adjacent flow dividers 41.

[0051] The upper melting zone, the middle homogenizing zone, and the lower storage zone are all equipped with electric heating and electric heating temperature control functions.

[0052] In specific implementation, such as Figure 1 As shown, the melting furnace body 10 is used for melting hot melt adhesive blocks and is equipped with an electric heating device and a heating system;

[0053] The glue melting furnace body 10 is provided from top to bottom as an upper glue melting zone 11, a middle glue homogenizing zone 12 and a lower glue storage zone 13;

[0054] The upper section of the hot melt zone 11 is equipped with a melting and cutting blade assembly; the melting and cutting blade assembly is composed of several melting and cutting blades 21 arranged at intervals; it is used to quickly melt and cut the room temperature solid hot melt adhesive block through this zone and drop it into the middle layer zone;

[0055] The middle section homogenization zone 12 is equipped with a transverse guide plate assembly; it is used to refine and divert the colloid falling from the upper layer through the guide plate to achieve a uniform viscosity of the molten liquid.

[0056] The lower section of the glue storage area 13 is equipped with a flow divider assembly and a vertical multi-wing guide assembly; the flow divider assembly is composed of several flow dividers 41 arranged at intervals; the vertical multi-wing guide assembly is composed of vertical multi-wing guide blocks 51 deployed between adjacent flow dividers 41; used for further static stirring of the molten glue liquid;

[0057] The glue inlet of the glue furnace body 10 is located at the top of the upper glue melting zone 11; the glue inlet is equipped with a cover plate 14; the glue outlet of the glue furnace body 10 is located at the bottom of the lower glue storage zone 13.

[0058] In order to change the control method of electric heating in the previous single hot melt adhesive furnace, preferably, the upper melting zone 11, the middle uniform adhesive zone 12 and the lower storage zone 13 are all equipped with electric heating devices; the electric heating devices are electrically connected to the heating system.

[0059] It should be noted that the temperature control program of the heating system adopts a temperature control program commonly used in industry, which will not be described in detail in this invention.

[0060] Furthermore, the transverse guide plate assembly consists of at least three layers of grid plates 31. The size of the mesh apertures on the grid plates 31 is designed according to the actual scenario requirements.

[0061] Furthermore, the heating element is an infrared heating device 60;

[0062] Both the melting and cutting blade 21 and the diverting blade 41 are provided with several through-holes;

[0063] A plurality of heating devices 32 are embedded between the layers of the transverse guide plate assembly; the heating devices 32 are provided with a plurality of through-holes.

[0064] The infrared heating device 60 is placed inside the penetration hole.

[0065] Preferably, the internal dimensions of the melting furnace body 10 include:

[0066] The length is 40mm×n+20mm×(n-1)+40mm, where n represents the number of melting and cutting blades;

[0067] Width is 450–500 mm;

[0068] Depth is 760–790 mm;

[0069] Effective capacity: 160kg.

[0070] Specifically, the melting device of this specification has a melting capacity of 0.75 to 1.5 kg / min.

[0071] Preferably, the cutting edge of the melting and cutting blade 21 is at a 30-degree angle; the two long sides of the melting and cutting blade 21 are respectively provided with a plurality of П-shaped adhesive grooves;

[0072] The length of the melting and cutting blade 21 is the same as the internal width of the melting furnace body 10; the blade width W1 of the melting and cutting blade 21 is 40mm and the blade thickness B1 is 20mm; the distance between adjacent melting and cutting blades 21 is 20mm.

[0073] Specifically, such as Figure 2 and Figure 3As shown, the cutting edge of the melting cutter 21 is at a 30-degree angle, and several П-shaped adhesive grooves are provided on both sides of the melting cutter 21; the length of the melting cutter 21 is the same as the internal width of the melting furnace body 10, so that the melting cutter 21 is fixedly installed in the melting furnace body 10, and there is no gap at the fixed part of the two; the blade width W1 of the melting cutter 21 is 40mm, and the blade thickness B1 is 20mm; the height of the melting cutter 21 is designed according to the actual needs of the scenario; the distance between adjacent melting cutters 21 is 20mm.

[0074] Preferably, the cutting edge of the flow divider 41 is at a 30-degree angle; the two long sides of the flow divider 41 are respectively provided with a plurality of П-shaped adhesive grooves;

[0075] The length of the diverting blade 41 is the same as the internal width of the melting furnace body 10; the blade width W2 of the diverting blade 41 is 40mm and the blade thickness B2 is 20mm; the spacing between adjacent diverting blades 41 is 20mm; the number of diverting blades 41 is one less than the number of melting and cutting blades 21.

[0076] Specifically, such as Figure 2 and Figure 3 The flow divider 41 shown has a 30-degree angled blade edge, and several П-shaped adhesive grooves are provided on both sides of the flow divider 41. The length of the flow divider 41 is the same as the internal width of the melting furnace body 10, so that the flow divider 41 is fixedly installed in the melting furnace body 10, and there is no gap at the connection between the two. The blade width W1 of the flow divider 41 is 40mm, and the blade thickness B1 is 20mm. The height of the flow divider 41 is designed according to the actual needs of the scenario. The spacing between adjacent flow dividers 41 is 20mm, and the number of flow dividers 41 is one less than the number of melting cutters.

[0077] Preferably, the height of the vertical multi-wing guide block 51 is 5mm to 10mm smaller than the height of the flow divider 41.

[0078] Preferably, the length of the vertical multi-wing guide block 51 is the same as the internal width of the melt furnace body 10; the width of the vertical multi-wing guide block 51 is 18mm.

[0079] Preferably, the vertical multi-wing guide block 51 includes an axial guide vane 52 and a radial guide vane 53; the radial guide vane 53 is arranged in parallel on the axial guide vane 52; the radial guide vane 53 is at a right angle to the axial guide vane 52.

[0080] Specifically, such as Figure 6 As shown, the vertical multi-blade guide block 51 includes an axial guide vane 52 and a radial guide vane 53. Several radial guide vanes 53 are arranged in parallel on the axial guide vane 52. The radial guide vanes 53 are perpendicular to the axial guide vane 52. The width of the vertical multi-blade guide block 51 is 18mm, so that the vertical multi-blade guide block 51 still retains enough small gaps between the flow dividers 41.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A special glue melting device for hot melt adhesive with high viscosity and high softening point, characterized by: It includes a melt-melt furnace body and a heating system; the heating system is deployed in the melt-melt furnace body; The glue melting furnace body is provided with an upper glue melting area, a middle glue equalizing area and a lower glue storage area in sequence from top to bottom; the glue inlet of the glue melting furnace body is located at the top of the upper glue melting area; the glue outlet of the glue melting furnace body is located at the bottom of the lower glue storage area; The upper melt zone is provided with a melt cutter assembly; the melt cutter assembly is composed of a plurality of melt cutters arranged in parallel at intervals; The middle section of the rubber-distributing area is provided with a transverse guide plate assembly; The lower rubber storage area is provided with a flow dividing knife assembly and a vertical multi-wing flow guiding assembly; the flow dividing knife assembly is composed of a plurality of flow dividing knives arranged in parallel at intervals; the vertical multi-wing flow guiding assembly is composed of vertical multi-wing flow guiding blocks arranged between adjacent flow dividing knives; The upper glue melting area, the middle glue equalizing area and the lower glue storage area are all equipped with electric heating and electric heating temperature control functions.

2. The adhesive melting device dedicated to the hot melt adhesive with high viscosity and high softening point according to claim 1, characterized in that: The upper glue melting area, the middle glue evenly distributing area and the lower glue storage area are all provided with electric heating devices; the electric heating devices and the heating system are connected to each other by electrical signals.

3. The adhesive melting device dedicated to the hot melt adhesive with high viscosity and high softening point according to claim 2, characterized in that: The transverse guide plate assembly is composed of at least three layers of grid plates.

4. The adhesive melting device dedicated to the hot melt adhesive with high viscosity and high softening point according to claim 3 is characterized in that: The electric heating device is an infrared heating device; The melting cutter and the diverter cutter are both provided with a plurality of penetration reserved holes; A plurality of heating devices are embedded between the layers of the transverse guide plate assembly; the heating devices are provided with a plurality of penetration reserved holes; The infrared heating device is placed in the penetration reserved hole.

5. The adhesive melting device dedicated to the hot melt adhesive with high viscosity and high softening point according to claim 1, characterized in that: The internal dimensions of the melt furnace body include: The length is 40mm×n+20mm×(n-1)+40mm, where n represents the number of melting cutters; Width: 450~500mm; The depth is 760~790mm.

6. The adhesive melting device dedicated to the hot melt adhesive with high viscosity and high softening point according to claim 5, characterized in that: The cutting edge of the melting knife is at an angle of 30 degrees; the long sides of the melting knife are provided with a plurality of П-shaped glue-sparse grooves; The length of the melting knife is the same as the inner width of the melt furnace body; the knife width W1 of the melting knife is 40 mm, and the knife thickness B1 is 20 mm; the spacing between adjacent melting knives is 20 mm.

7. The adhesive melting device dedicated to the hot melt adhesive with high viscosity and high softening point according to claim 5, characterized in that: The blade of the diverter knife is at an angle of 30 degrees; the long sides of the diverter knife are provided with a plurality of П-shaped glue-sparse grooves; The length of the diverter knife is the same as the internal width of the melt furnace body; the knife width W2 of the diverter knife is 40mm, and the knife thickness B2 is 20mm; the spacing between adjacent diverter knives is 20mm; the number of the diverter knives is one less than the number of the melting and cutting knives.

8. The adhesive melting device dedicated to hot melt adhesive with high viscosity and high softening point according to claim 1, characterized in that: The height of the vertical multi-wing guide block is 5 mm to 10 mm smaller than the height of the diverter knife.

9. The adhesive melting device dedicated to the hot melt adhesive with high viscosity and high softening point according to claim 7, characterized in that: The length of the vertical multi-wing guide block is the same as the internal width of the melt furnace body; the width of the vertical multi-wing guide block is 18 mm.

10. The adhesive melting device dedicated to hot melt adhesive with high viscosity and high softening point according to claim 1, characterized in that: The vertical multi-wing guide block includes axial guide vanes and radial guide vanes; the radial guide vanes are arranged in parallel on the axial guide vanes.

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