Inner blocking type hot melt adhesive coating die head

Abstract

The invention provides an inner blocking type hot melt adhesive coating die head which comprises an upper die body, a lower die body and a gasket arranged between the upper die body and the lower die body, the upper die body, the lower die body and the gasket are connected into a whole through a die locking screw, the lower die body is provided with a lower die feeding channel, and a first-stage buffer groove is formed in the rear area of the top face of the lower die body in the breadth direction. The bottom of the first-stage buffer groove is communicated with a lower die feeding channel, a series of flow channel grooves distributed in the front-back direction are evenly distributed in the position, on the front side of the first-stage buffer groove, of the top face of the lower die body in the breadth direction, adjusting grooves penetrating through the die bodies in the breadth direction are formed in the positions, located in front of the flow channel grooves, of the upper die body and the lower die body, and annular sealing grooves are formed in the two ends of each adjusting groove. The gasket is located in the rear side area of the first-stage buffer groove, and an extrusion channel is formed between the upper die body and the lower die body and located in the front side area of the gasket. Inner baffle breadth adjusting mechanisms are arranged on the left side and the right side of the lower die body. According to the invention, the thickness of the extruded hot melt adhesive in different breadth directions can be ensured to be uniform and consistent, and the breadth of the product can be adjusted while online production is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of coating die heads, in particular to an inner-blocking hot-melt adhesive coating die head. Background Art

[0002] The standard hot melt adhesive coating die head is used to coat hot melt adhesive. The application range of hot melt adhesive is very wide. Because of its characteristics of fast bonding, high strength, water resistance and heat resistance, it covers almost all fields that need bonding, such as paper gift boxes, labels, food packaging, medical packaging, etc.

[0003] The current die is restricted by its own structure, making it very difficult to ensure uniform coating thickness in the width direction of the final extruded product. In addition, the sealing performance of the die is not good enough, which is prone to leakage and material volatilization, resulting in waste.

[0004] At the same time, the standard hot melt adhesive die head can only produce products of a single width. Different die heads need to be replaced when producing products of different widths. The equipment downtime is long when the die head is replaced during production. The die head is easily damaged when replaced and the replacement process is cumbersome. Summary of the invention

[0005] In view of the above problems, the present invention aims to provide an internal stop hot melt adhesive coating die head, which can ensure that the extruded hot melt adhesive has a uniform thickness in different width directions and can adjust the width of the product during online production.

[0006] The technical solution of the present invention is an internal-blocking hot-melt adhesive coating die head, comprising an upper die body, a lower die body and a gasket arranged therebetween, the above three being connected as a whole by a locking screw, the lower die body being provided with a lower die feed channel, a primary buffer groove being provided in the rear area of ​​the top surface of the lower die body along the width direction, the bottom of the primary buffer groove being connected to the lower die feed channel, a series of flow channel grooves arranged in the front-to-back direction being evenly distributed on the top surface of the lower die body in front of the primary buffer groove along the width direction, an adjustment groove penetrating the die body along the width direction being provided on the upper die body and the lower die body in front of the flow channel groove, annular sealing grooves being provided at both ends of the adjusting groove, the sealing A secondary buffer groove is arranged on the surface of the lower mold body on the front side of the sealing groove along the width direction, the gasket is located in the rear area of ​​the primary buffer groove, and an extrusion channel is formed in the front area of ​​the gasket between the upper mold body and the lower mold body; inner stop width adjustment mechanisms are arranged on the left and right sides of the lower mold body, and the inner stop width adjustment mechanism includes an adjustment rod that can be laterally operated and retracted and an inner stop sheet connected to the adjustment rod, the adjustment rod is inserted into the adjustment groove and sealed by the sealing members at the sealing grooves at both ends, the thickness of the inner stop sheet is consistent with the thickness of the extrusion channel, and the movement of the adjustment rod along the width direction is controlled so that the inner stop sheet blocks the extrusion channel of the corresponding width at its front end.

[0007] Preferably, the inner stop width adjustment mechanism includes a connecting frame connected to the left and right sides of the lower mold body, a lead screw is rotatably mounted on the connecting frame through a bearing, guide rods are fixedly connected to both sides of the lead screw, a slider is sleeved on the guide rod, a threaded hole is provided in the middle area of ​​the slider and is threadedly connected to the lead screw, an adjusting rod is connected to the slider, and a hand wheel is connected to the outer end of the lead screw. Turning the hand wheel drives the lead screw to rotate, and then the adjusting rod is driven forward or backward through the slider, so that the inner stopper blocks the extrusion channel of the corresponding area on the front side.

[0008] Preferably, a pointer is provided on the side of the slider, and a scale mark is correspondingly connected to the side of the connecting frame, so that the lower end of the pointer corresponds to the scale mark when the slider moves forward and backward.

[0009] Preferably, four feed blocks are arranged at intervals along the width direction on the bottom surface of the lower mold body, a material flow channel is arranged in the feed block, the feed port is arranged on the rear side of the feed block, and the discharge port is arranged on the top surface of the feed block. The lower mold feed channel is vertically arranged in the lower mold body, and the lower end of the lower mold feed channel passes through the lower mold body and is connected with the discharge port of the feed block, and the upper end of the lower mold feed channel is connected with the bottom surface of the first-level buffer tank.

[0010] Preferably, the locking screws are a front-to-back double-row structure, the rear row of locking screws are located at the rear of the upper mold body and correspond to the rear area of ​​the primary buffer groove of the lower mold body, and the front row of locking screws are located at the front of the upper mold body and correspond to the position between the runner grooves of the lower mold body.

[0011] Preferably, a tertiary buffer groove is provided on the surface of the lower mold body in front of the secondary buffer groove along the width direction.

[0012] Preferably, two annular sealing grooves are spaced apart at the left and right ends of the adjusting groove, and sealing is achieved through a double-layer sealing structure after the adjusting rod is inserted.

[0013] Preferably, the adjustment groove and the adjustment rod are both circular in cross-section, wherein the adjustment grooves on the bottom surface of the upper mold body and the top surface of the lower mold body are both semicircular, and the adjustment groove with a circular cross-section is formed after the upper mold body and the lower mold body are molded together.

[0014] Preferably, a series of heating holes along the front-to-back direction are provided in the lower mold body, and the heating holes are evenly arranged in a row along the width direction.

[0015] The present invention can ensure that the extruded hot melt adhesive has uniform thickness in different width directions, so that the velocity vectors of the raw materials in different width directions tend to be consistent during the extrusion process, ensuring that the width of the product can be adjusted during online production, and adopting double-row locking screws to ensure good sealing of the die head. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 An exploded view of the present invention; Figure 3 for Figure 2 A partial enlarged view of the middle A; Figure 4 It is a structural schematic diagram of the inner stop width adjustment mechanism in the present invention; Figure 5 It is a schematic diagram of the cross-sectional structure of the internal flow channel of the present invention; Among them: 1—upper mold body; 2—lower mold body; 21—lower mold feed channel; 22—first-level buffer groove; 23—flow channel groove; 24—adjustment groove; 241—annular sealing groove; 25—second-level buffer groove; 26—third-level buffer groove; 27—heating hole; 3—gasket; 4—locking screw; 5—extrusion channel; 6—inner stop width adjustment mechanism; 61—adjusting rod; 62—inner stopper; 63—connecting frame; 64—screw; 65—guide rod; 66—slider; 67—handwheel; 68—pointer; 7—feed block. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] like Figures 1 to 5 As shown, the present invention provides an internal stop type hot melt adhesive coating die head, comprising an upper die body 1, a lower die body 2 and a gasket 3 arranged therebetween, the above three are connected as a whole by a locking screw 4, the lower die body 2 is provided with a lower die feed channel 21, the rear area of ​​the top surface of the lower die body 2 is provided with a primary buffer groove 22 along the width direction, the bottom of the primary buffer groove 22 is connected to the lower die feed channel 21, the top surface of the lower die body 2 on the front side of the primary buffer groove 22 is uniformly distributed with a series of flow channel grooves 23 arranged in the front and rear directions along the width direction, the upper die body 1 and the lower die body 2 are provided with an adjustment groove 24 that penetrates the die body along the width direction at the front of the flow channel groove 23, an annular sealing groove 241 is provided at both ends of the adjustment groove 24, and the sealing groove 2 A secondary buffer groove 25 is arranged on the surface of the lower mold body 2 on the front side of 41 along the width direction, the gasket 3 is located in the rear area of ​​the primary buffer groove 22, and an extrusion channel 5 is formed in the front area of ​​the gasket 3 between the upper mold body 1 and the lower mold body 2; inner block width adjustment mechanisms 6 are arranged on the left and right sides of the lower mold body 2, and the inner block width adjustment mechanism 6 includes an adjustment rod 61 that can be laterally operated and retracted and an inner block sheet 62 connected to the adjustment rod 61, the adjustment rod 61 is inserted into the adjustment groove 24 and sealed by the sealing members at the sealing grooves 241 at both ends, the thickness of the inner block sheet 62 is consistent with the thickness of the extrusion channel 5, and the movement of the adjustment rod 61 along the width direction is controlled so that the inner block sheet 62 blocks the extrusion channel 5 of the corresponding width at its front end.

[0019] On the basis of the above scheme, the inner stop width adjustment mechanism 6 includes a connecting frame 63 connected to the left and right sides of the lower mold body 2, and a lead screw 64 is rollingly installed on the connecting frame 63 through a bearing. Guide rods 65 are fixedly connected to both sides of the lead screw 64, and a slider 66 is sleeved on the guide rod 65. A threaded hole is set in the middle area of ​​the slider 66 and is threadedly connected to the lead screw 64. An adjusting rod 61 is connected to the slider 66, and a hand wheel 67 is connected to the outer end of the lead screw 64. Turning the hand wheel 67 drives the lead screw 64 to rotate, and then drives the adjusting rod 61 forward or backward through the slider 66, so that the inner stopper 62 blocks the extrusion channel 5 in the corresponding area of ​​the front side.

[0020] Specifically, a pointer 68 is disposed on the side of the slider 66 , and a scale mark is correspondingly connected to the side of the connecting frame 63 . When the slider 66 moves forward and backward, the lower end of the pointer 68 corresponds to the scale mark.

[0021] In addition, four feed blocks 7 are arranged at intervals along the width direction on the bottom surface of the lower mold body 2, a material flow channel is arranged in the feed block 7, the feed port is arranged on the rear side of the feed block 7, and the discharge port is arranged on the top surface of the feed block 7. The lower mold feed channel 21 is vertically arranged in the lower mold body 2, and the lower end of the lower mold feed channel 21 passes through the lower mold body 2 and is connected with the discharge port of the feed block 7, and the upper end of the lower mold feed channel 21 is connected with the bottom surface of the primary buffer tank 22.

[0022] In addition, the locking screws 4 are a front-to-back double-row structure, the rear row of locking screws 4 are located at the rear of the upper mold body 1 and correspond to the rear area of ​​the primary buffer groove 22 of the lower mold body 2, and the front row of locking screws 4 are located at the front of the upper mold body 1 and correspond to the position between the flow channel grooves 23 of the lower mold body 2.

[0023] Specifically, a tertiary buffer groove 26 is provided on the surface of the lower mold body 2 in front of the secondary buffer groove 25 along the width direction.

[0024] Specifically, two annular sealing grooves 241 are spaced apart at the left and right ends of the adjusting groove 24 , and sealing is achieved through a double-layer sealing structure after the adjusting rod 61 is inserted.

[0025] Furthermore, the adjustment groove 24 and the adjustment rod 61 are both circular in cross-section, wherein the adjustment grooves 24 on the bottom surface of the upper mold body 1 and the top surface of the lower mold body 2 are both semicircular, and the adjustment grooves with circular cross-sections are formed after the upper mold body 1 and the lower mold body 2 are molded together.

[0026] In addition, a series of heating holes 27 along the front-to-back direction are arranged in the lower mold body 2, and the heating holes 27 are evenly arranged in a row along the width direction.

[0027] The raw material enters from the feed port of the feed block 7, passes through the internal material flow channel, and reaches the primary buffer groove 22 from the lower die feed channel 21. After filling the primary buffer groove 22, it passes through a series of flow channel grooves 23 and reaches the front adjustment groove 24. The width of the adjustment groove 24 is positioned by the adjustment rods 61 on the left and right sides. After passing through the adjustment groove 24, the raw material reaches the secondary buffer groove 25 in front, and then passes through the tertiary buffer groove 26. It is blocked and positioned by the inner baffle 62 in the left and right positions of the extrusion channel 5 on the front side, so that the velocity vectors of the raw material in different width directions tend to be consistent during extrusion, ensuring the extrusion quality of the raw material. In this extrusion process, the width of the product can be adjusted online, specifically by turning the hand wheel 67 to drive the screw 64 to rotate, and then driving the adjustment rod 61 forward or backward through the slider 66, so that the inner baffle 62 blocks the extrusion channel 5 in the corresponding area of ​​the front side. It is not necessary to shut down the extrusion production line and then replace the die head of different widths as in the past, which can effectively improve production efficiency and protect the die head.

[0028] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the invention. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principle of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. An internal stop hot melt adhesive coating die head, characterized in that; The invention comprises an upper mold body (1), a lower mold body (2) and a gasket (3) arranged therebetween, wherein the three are connected as a whole by a locking screw (4), the lower mold body (2) is provided with a lower mold feed channel (21), a first-level buffer groove (22) is provided in the rear area of ​​the top surface of the lower mold body (2) along the width direction, the bottom of the first-level buffer groove (22) is connected to the lower mold feed channel (21), a series of flow channel grooves (23) arranged in the front-to-back direction are evenly distributed on the top surface of the lower mold body (2) in the front side of the first-level buffer groove (22) along the width direction, the upper mold body (1) and the lower mold body (2) are provided with an adjustment groove (24) penetrating the mold body in the width direction at the front of the flow channel groove (23), an annular sealing groove (241) is provided at both ends of the adjustment groove (24), and the surface of the lower mold body (2) in front of the sealing groove (241) is A secondary buffer groove (25) is provided along the width direction, the gasket (3) is located in the rear area of ​​the primary buffer groove (22), and an extrusion channel (5) is formed between the upper mold body (1) and the lower mold body (2) in the front area of ​​the gasket (3); an inner stop width adjustment mechanism (6) is provided on the left and right sides of the lower mold body (2), the inner stop width adjustment mechanism (6) comprises an adjustment rod (61) that can be operated and extended laterally and an inner stop sheet (62) connected to the adjustment rod (61), the adjustment rod (61) is inserted into the adjustment groove (24) and sealed by sealing members at the sealing grooves (241) at both ends, the thickness of the inner stop sheet (62) is consistent with the thickness of the extrusion channel (5), and the movement of the adjustment rod (61) along the width direction is controlled so that the inner stop sheet (62) blocks the extrusion channel (5) of the corresponding width at its front end.

2. An internal stop hot melt adhesive coating die head according to claim 1, characterized in that; The inner stop width adjustment mechanism (6) comprises a connecting frame (63) connected to the left and right sides of the lower mold body (2), a lead screw (64) being rollingly mounted on the connecting frame (63) via a bearing, guide rods (65) being fixedly connected to both sides of the lead screw (64), a slider (66) being sleeved on the guide rod (65), a threaded hole being provided in the middle region of the slider (66) and being threadedly connected to the lead screw (64), an adjustment plug rod (61) being connected to the slider (66), an outer end of the lead screw (64) being connected to a hand wheel (67), and the hand wheel (67) being turned to drive the lead screw (64) to rotate, thereby driving the adjustment plug rod (61) forward or backward through the slider (66), so that the inner stopper (62) blocks the extrusion channel (5) in the corresponding area on the front side.

3. An internal stop hot melt adhesive coating die head according to claim 2, characterized in that; A pointer (68) is provided on the side of the slider (66), and a scale mark is correspondingly connected to the side of the connecting frame (63). When the slider (66) moves forward and backward, the lower end of the pointer (68) corresponds to the scale mark.

4. The internal stop hot melt adhesive coating die head according to claim 1, characterized in that; Four feed blocks (7) are arranged at intervals on the bottom surface of the lower mold body (2) along the width direction, a material flow channel is arranged in the feed block (7), a feed port is arranged on the rear side of the feed block (7), and a discharge port is arranged on the top surface of the feed block (7), the lower mold feed channel (21) is arranged vertically in the lower mold body (2), the lower end of the lower mold feed channel (21) passes through the lower mold body (2) and is connected to the discharge port of the feed block (7), and the upper end of the lower mold feed channel (21) is connected to the bottom surface of the primary buffer groove (22).

5. The internal stop hot melt adhesive coating die head according to claim 1, characterized in that; The locking screws (4) are of a front-to-back double-row structure, wherein the rear-row locking screws (4) are located at the rear of the upper mold body (1) and correspond to the rear area of ​​the primary buffer groove (22) of the lower mold body (2), and the front-row locking screws (4) are located at the front of the upper mold body (1) and correspond to the position between the flow channel grooves (23) of the lower mold body (2).

6. The internal stop hot melt adhesive coating die head according to claim 1, characterized in that; A tertiary buffer groove (26) is provided on the surface of the lower mold body (2) in front of the secondary buffer groove (25) along the width direction.

7. The internal stop hot melt adhesive coating die head according to claim 1, characterized in that; Two annular sealing grooves (241) are arranged at intervals at the left and right ends of the adjustment groove (24), and sealing is achieved through a double-layer sealing structure after the adjustment rod (61) is inserted.

8. The internal stop hot melt adhesive coating die head according to claim 1, characterized in that; The adjustment groove (24) and the adjustment rod (61) are both circular in cross-section, wherein the adjustment groove (24) on the bottom surface of the upper mold body (1) and the top surface of the lower mold body (2) are both semicircular, and the adjustment groove with a circular cross-section is formed after the upper mold body (1) and the lower mold body (2) are molded together.

9. The internal stop hot melt adhesive coating die head according to claim 1, characterized in that; A series of heating holes (27) are arranged in the lower mold body (2) along the front-to-back direction, and the heating holes (27) are evenly arranged in a row along the width direction.

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