Hot melt adhesive storage paper barrel with expanded mouth and straight wall and bottom sealing method thereof

Abstract

The present application relates to the field of paper barrel manufacturing, and discloses an expanded-mouth straight-wall type hot-melt adhesive storage paper barrel and a bottom sealing method thereof, which comprises the following steps: S1, a metal ring is sleeved on a paper barrel body, and an end portion sleeved with the metal ring is placed in a diameter expanding machine to expand the diameter, so as to form an expanded end on the paper barrel body; S2, a bottom plate is placed on a tray in a bottom sealing crimping machine, and then the paper barrel body is placed on the bottom sealing crimping machine, the bottom sealing crimping machine clamps the paper barrel body, and the tray sends the bottom plate upward into the expanded end; S3, a crimping die in the bottom sealing crimping machine moves upward, the crimping die crimps the expanded end, the crimping abuts against the bottom plate, the crimping cooperates with an inner top wall of the expanded end to seal the bottom plate, and the bottom sealing is completed. The present application has the advantages of convenient operation, good bottom sealing quality, and the fact that the inner wall of the paper barrel body is a straight wall with a uniform and consistent inner diameter, so that the pressure disc piston can be lowered to the bottom plate, thereby discharging all the hot-melt adhesive, and preventing waste of the adhesive.

Description

Expansion-mouth straight-wall hot melt adhesive storage paper drum and its sealing method Technical Field

[0001] This invention relates to the field of paper drum manufacturing, and more particularly to a hot melt adhesive storage paper drum with an inflated spout and a straight wall, and a sealing method thereof. Background Technology

[0002] In recent years, paper drums have been used in a wider range of applications, not only for storing solid products but also for storing liquid products. Among the liquid products is a special one – hot melt adhesive. Hot melt adhesive solidifies at room temperature, but turns into a high-viscosity liquid when heated to around 180°C. During unloading, a pressure plate piston is used. An electric heating mechanism is installed in the pressure plate piston, and a sealing ring is installed on the side wall of the pressure plate piston. A drain pipe is installed on the pressure plate piston, penetrating the top and bottom walls. The pressure plate piston extends into the paper drum, and the sealing ring on the pressure plate piston seals tightly against the inner wall of the paper drum. The electric heating mechanism heats the pressure plate piston, which heats the solid hot melt adhesive into a liquid state. When the pressure plate piston is pressed down in the paper drum, the liquid hot melt adhesive is discharged from the drain pipe under pressure.

[0003] To facilitate cooperation with the pressure plate piston, commercially available paper drums with an inflatable spout are generally used to store hot melt adhesive. During the production of these drums, metal rings are fitted at both ends to enhance strength. To prevent interference between the top end of the drum and the pressure plate piston, the top and bottom ends, along with the metal rings, are usually rolled together to create a chamfer between the ends and the inner wall of the drum. For sealing the bottom, an edge-rolling device is used to roll the edge of the drum with the metal ring at one end, creating an inwardly protruding boss. A bottom plate is then installed with an interference fit at the bottom of the drum, resting against the boss. The boss acts as a positioning element, and the interference fit between the bottom plate and the drum creates a seal. However, this type of drum has a problem: due to the inwardly protruding boss at the bottom, the pressure plate piston is restricted and cannot fully reach the bottom plate, resulting in hot melt adhesive residue inside the drum and waste.

[0004] Therefore, in order for the pressure plate piston to run to the bottom, the paper drum needs to have straight walls. A type of paper drum with detachable caps at both the top and bottom has appeared on the market. This eliminates the need to form a protrusion by grinding the bottom of the paper drum, and the pressure plate piston can run all the way to the bottom to discharge all the hot melt glue in the paper drum without leaving any residue. However, because the cap and the paper drum are detachable, the connection strength between them is unstable. After the hot melt glue is filled, the cap at the bottom is prone to detaching from the paper drum due to heavy pressure, causing the hot melt glue to spill. Summary of the Invention

[0005] The purpose of this invention is to provide a hot melt adhesive storage paper drum with an inflatable straight wall and a sealing method thereof. The sealing method produces a hot melt adhesive storage paper drum with a straight inner wall. During dispensing, the movement of the pressure plate piston is not affected, so that all the hot melt adhesive in the paper drum can be discharged.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a method for sealing the bottom of a straight-walled hot melt adhesive storage paper drum with an inflated opening, comprising the following steps:

[0007] S1. Fit a metal ring onto any end of the paper drum body, and place the end with the metal ring onto the expanding machine to expand the diameter, so as to form an expanded end on the paper drum body.

[0008] S2. Place the bottom plate on the tray in the bottom sealing and edge rolling machine, then place the expanded paper drum body on the bottom sealing and edge rolling machine, and place the expanded end against the bottom sealing and edge rolling machine to clamp the paper drum body. The tray feeds the bottom plate upward into the expanded end, and the bottom plate abuts against the inner top wall of the expanded end.

[0009] S3. The edge-rolling die in the bottom sealing and edge-rolling machine moves upward. After the edge-rolling die contacts the expanded diameter end of the paper drum body, it rolls the expanded diameter end inward to form an edge. The edge abuts against the bottom plate. The edge, together with the inner top wall of the expanded diameter end, seals the bottom plate and completes the bottom sealing.

[0010] Furthermore, in the aforementioned method for sealing the bottom of a straight-walled hot melt adhesive storage paper drum with an expanded opening, in step S2, the bottom sealing and edge-rolling machine is clamped on the metal ring at the expanded diameter end and abuts against the outer top wall of the expanded diameter end.

[0011] Furthermore, in the aforementioned sealing method for the expansion-mouth straight-wall type hot melt adhesive storage paper drum, the single-sided distance between the bottom plate and the expansion end in S2 does not exceed 0.5mm.

[0012] The expanding machine used in the sealing method of the expansion-mouth straight-wall type hot melt adhesive storage paper drum includes: a platform fixed to the ground, with a first through hole on the platform; several compensation plates evenly distributed around the first through hole, each compensation plate having a groove; several wedge-shaped sliders slidably disposed in the grooves of corresponding compensation plates, with tension springs between the corresponding wedge-shaped sliders and compensation plates, and arc-shaped molding walls at the outer ends of the wedge-shaped sliders, the several arc-shaped molding walls forming a circular molding wall, the initial outer diameter of the circular molding wall matching the inner diameter of the paper drum body; when the wedge-shaped sliders slide outward, the circular molding wall expands; when the wedge-shaped sliders slide inward, the circular molding wall shrinks and returns to its original position; and several wedge-shaped push blocks evenly distributed around the first through hole and slidably connected to the platform, the inner ends of each wedge-shaped push block extending into the first through hole, each wedge-shaped push block pushing the wedge-shaped sliders in two adjacent compensation plates outward. Several arc-shaped blocks, each fixed to a corresponding wedge-shaped slider, form a ring. The arc-shaped blocks are located inside the arc-shaped forming wall of the wedge-shaped slider, and each arc-shaped block slides synchronously with the wedge-shaped slider. A pressure plate abuts against all the compensation plates, wedge-shaped sliders, and wedge-shaped push blocks. The pressure plate is connected to the compensation plates and is located inside the ring formed by the arc-shaped blocks. A second through hole concentric with the first through hole is provided on the pressure plate. A punch passes through the second through hole and contacts the inner end of each wedge-shaped push block. The punch presses down and pushes each wedge-shaped push block to slide outward synchronously. Two chucks are symmetrically arranged on the platform with the first through hole as the center and slide and engage with the platform. Each chuck has a first semi-circular hole on its inner wall. When the two chucks are engaged, the two first semi-circular holes are engaged to form a circular hole. An inner forming groove is provided on the hole wall of the first semi-circular hole. The height difference between the inner forming groove and the arc-shaped forming wall is equal to the wall thickness of the paper drum body plus the thickness of the metal ring.

[0013] Furthermore, in the aforementioned method for sealing the bottom of a straight-walled hot melt adhesive storage paper drum, an expanding machine is used, wherein two wedge-shaped surfaces are symmetrically arranged at the outer end of the wedge-shaped push block, and the two side walls of the arc-shaped forming wall of the wedge-shaped slider press against the wedge-shaped surfaces on the two adjacent wedge-shaped push blocks respectively; an inclined top surface is provided at the inner end of the wedge-shaped push block from bottom to top and from inside to outside, the punch is inverted conical in shape, and several inclined surfaces are evenly distributed around the outer wall of the punch, each inclined surface abutting against the inclined top surface of a wedge-shaped push block.

[0014] Furthermore, in the aforementioned method for sealing the bottom of a straight-walled hot melt adhesive storage paper drum, an expanding machine is used, wherein a first tension spring rod is provided on the compensation plate, a second tension spring rod is provided on the wedge-shaped slider, and a number of elongated holes and tension spring holes are evenly distributed around the circumference of the pressure plate. The first tension spring rod passes upward through the tension spring hole, the second tension spring rod passes upward through the elongated hole, and the two ends of the tension spring are respectively fixed on the first tension spring rod and the second tension spring rod.

[0015] The bottom sealing and edge-rolling machine used in the bottom sealing method of the aforementioned expansion-mouth straight-wall type hot melt adhesive storage paper drum further includes: a machine base, fixed to the ground, with a third through hole on the machine base; two positioning plates, symmetrically arranged on the machine base with the third through hole as the center and slidably engaged with the machine base, each positioning plate having a semi-flared hole on its inner wall, the smaller diameter end of the semi-flared hole being located at the top; the two positioning plates aligning, the two semi-flared holes aligning to form a flared hole, the inner diameter of the smaller diameter end of the flared hole matching the inner diameter of the bottom plate; a tray, lifted and positioned in the machine base, the tray aligned vertically with the aligned flared hole; and a load-bearing plate, fixed to the machine base, the load-bearing plate located at... Above the positioning plate, a fourth through hole is provided on the load-bearing plate; two clamping plates are symmetrically arranged on the load-bearing plate with the fourth through hole as the center and are slidably engaged with the bottom wall of the load-bearing plate. A second semi-circular hole is provided on the inner wall of each clamping plate. When the two clamping plates are aligned, the two second semi-circular holes are aligned to form a clamping hole. The clamping hole and the trumpet-shaped hole are aligned coaxially. The diameter of the clamping hole = the outer diameter of the paper drum body + the outer diameter of the metal ring. The height difference between the second semi-circular hole and the positioning plate = the height of the expansion end; the edge rolling die is lifted and set in the machine base. The edge rolling die is provided with a clearance hole that can accommodate the pallet and an edge rolling groove that matches the expansion end.

[0016] Furthermore, in the aforementioned sealing and edge-rolling machine used for sealing the bottom of the expansion-mouth straight-wall type hot melt adhesive storage paper drum, several edge-rolling cylinders and one push cylinder are evenly distributed around the circumference of the machine base. The piston rod of the push cylinder is connected to the tray. A receiving seat is connected to the bottom of the edge-rolling mold. The receiving seat is connected to the piston rod of each edge-rolling cylinder. An avoidance groove communicating with the avoidance hole is opened in the receiving seat. The inner diameter of the avoidance groove is not less than the diameter of the avoidance hole. A through hole communicating with the avoidance groove is provided on the bottom wall of the receiving seat. The push cylinder is located in the through hole.

[0017] Furthermore, in the aforementioned sealing method for the bottom sealing of the expansion-mouth straight-wall type hot melt adhesive storage paper drum, the outer groove wall of the sealing groove is higher than the inner groove wall, and a guide wall that bends outward toward the outer groove wall is provided on the inner groove wall. The angle between the guide wall and the outer side wall of the sealing mold is 4° to 6°.

[0018] The hot melt adhesive storage paper drum with an inflated opening and straight wall, manufactured by the sealing method described above, includes: a paper drum body, with metal rings fitted at both the upper and lower ends of the paper drum body; the upper end of the paper drum body and the metal ring at the upper end are rolled at the edge; the inner diameter of the upper end of the paper drum body is larger than the inner diameter of the paper drum body; the lower end of the paper drum body and the metal ring at the lower end are folded outward to form an expanded diameter end; the expanded diameter end is rolled inward to form an installation groove; a bottom plate is sealed and fitted in the installation groove; and the inner wall of the paper drum body above the bottom plate is a straight wall with a uniform inner diameter.

[0019] The advantages of this invention are as follows: 1. The inner wall of the paper drum body located above the bottom plate is a straight wall with a uniform inner diameter, which will not interfere with the pressure plate piston. The pressure plate piston can descend along the paper drum body until it abuts against the bottom plate, thereby discharging all the hot melt adhesive in the paper drum and preventing any adhesive residue in the paper drum from causing waste. The metal ring located at the bottom can enhance the connection strength between itself and the paper drum body after being folded outward and rolled inward twice. The snap-fit ​​structure between the bottom plate and the expanded diameter end can improve the connection strength between the bottom plate and the paper drum body, and will not fall off due to insufficient pressure.

[0020] 2. Using an expansion machine can expand the diameter of the paper drum body to form an expanded end. Using a bottom sealing and edge-rolling machine can first place the bottom plate against the expanded end, and then roll the edge of the expanded end to press the bottom plate firmly into the expanded end to form a seal. This bottom sealing method of first expanding the diameter, then placing the bottom plate, and finally rolling the edge inward to press the bottom plate firmly does not require the bottom plate to be squeezed for an interference fit, will not damage the bottom plate, and can ensure the connection strength between the bottom plate and the paper drum body.

[0021] 3. Using an expansion machine to expand the diameter of the paper drum can effectively reduce the ovality of the paper drum during the expansion process, ensuring the shape and dimensional accuracy of the paper drum. Using a bottom sealing and edge rolling machine can complete the bottom sealing and edge rolling work at the same time, improving efficiency. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the structure of the hot melt adhesive storage paper drum with an inflated opening and straight wall as described in this invention.

[0023] Figure 2 is a schematic diagram of the expansion machine used in the sealing method of the expansion-mouth straight-wall type hot melt adhesive storage paper drum of the present invention.

[0024] Figure 3 is a schematic cross-sectional view of the structure along the AA direction in Figure 2.

[0025] Figure 4 is a schematic diagram of the structure in Figure 2 after removing the punch, table, pressure plate and chuck.

[0026] Figure 5 is a schematic diagram of the structure after removing the arc-shaped block in Figure 4.

[0027] Figure 6 is a schematic diagram of the structure of the paper drum after the expansion machine expands the diameter.

[0028] Figure 7 is a schematic diagram of the bottom sealing and edge rolling machine used in the bottom sealing method of the expansion-mouth straight-wall type hot melt adhesive storage paper drum of the present invention.

[0029] Figure 8 is a schematic diagram of the connection structure between the positioning disk and the base in Figure 7.

[0030] Figure 9 is a schematic diagram of the connection structure between the clamping plate and the bottom wall of the load-bearing plate in Figure 7.

[0031] Figure 10 is a schematic diagram of the edge-rolling mold in Figure 7.

[0032] Figure 11 is a schematic diagram of the structure when the paper drum is expanded and placed on the bottom sealing and edge rolling machine. Detailed Implementation

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0034] As shown in Figure 1, the hot melt adhesive storage paper drum with a straight wall and an inflated opening according to the present invention includes: a paper drum body 1, with metal rings 11 fitted at both the upper and lower ends of the paper drum body 1, the upper end port of the paper drum body 1 and the metal ring 11 at the upper end being rolled at the edge, the inner diameter of the upper end port of the paper drum body 1 being larger than the inner diameter of the paper drum body 1, the lower end of the paper drum body 1 and the metal ring 11 at the lower end being folded outward to form an expanded diameter end 12, the expanded diameter end 12 being rolled inward to form an installation groove, a bottom plate 13 being sealed and fitted in the installation groove, and the inner wall of the paper drum body 1 above the bottom plate 13 being a straight wall with a uniform inner diameter.

[0035] After hot melt adhesive is filled into the paper drum, the pressure plate piston, guided by the upper port, smoothly extends into the paper drum body 1 and seals against the inner wall of the paper drum body 1. The pressure plate piston descends along the paper drum body 1 until it abuts against the bottom plate 13, thereby discharging all the hot melt adhesive from the paper drum. The metal ring 11 at the bottom, after being folded outward and rolled inward twice, enhances the connection strength between it and the paper drum body 1. The snap-fit ​​structure between the bottom plate 13 and the expanded diameter end 12 further strengthens the connection between the bottom plate 13 and the paper drum body 1, preventing it from detaching due to insufficient pressure.

[0036] The method of curling the edge of the paper drum port is existing technology and will not be elaborated here. The sealing method of the expansion-mouth straight-wall type hot melt adhesive storage paper drum includes the following steps:

[0037] S1. Fit a metal ring 11 onto any end of the paper drum body 1, and place the end fitted with the metal ring 11 into an expanding machine to expand the diameter, so as to form an expanded end 12 on the paper drum body 1.

[0038] S2. Place the bottom plate 13 on the tray 63 in the bottom sealing and edge rolling machine, then place the expanded paper drum body 1 on the bottom sealing and edge rolling machine, and place the expanded end 12 against the bottom sealing and edge rolling machine to clamp the paper drum body 1. The tray 63 feeds the bottom plate 13 upward into the expanded end 12, and the bottom plate 13 abuts against the inner top wall of the expanded end 12.

[0039] In this step, the bottom sealing and edge rolling machine clamps onto the metal ring 11 of the paper drum body 1 located above the expansion end 12 and abuts against the outer top wall of the expansion end 12 to prevent damage to the paper drum body 1. The single-sided distance between the bottom plate 13 and the expansion end 12 does not exceed 0.5mm to ensure that the bottom plate 13 and the expansion end 12 are in clearance fit, so that the bottom plate 13 can be easily fed into the expansion end 12. However, the bottom plate 13 and the expansion end 12 will not be too loose to prevent insufficient single-sided connection strength between the bottom plate 13 and the edge rolling when sealing the bottom.

[0040] S3. In the bottom sealing and edge-rolling machine, the edge-rolling die 66 moves upward. After contacting the expanded diameter end 12 of the paper drum body 1, the edge-rolling die 66 rolls the expanded diameter end 12 inward to form an edge. The edge abuts against the bottom plate 13 and presses the bottom plate 13 firmly. The edge, together with the inner top wall of the expanded diameter end 12, seals the bottom plate 13, completing the bottom sealing. When the edge-rolling die 66 applies upward pressure to the expanded diameter end 12, the bottom sealing and edge-rolling mechanism applies downward resistance to the outer top wall of the expanded diameter end 12, thereby ensuring successful edge rolling and preventing squeezing damage to the paper drum body during the edge rolling process.

[0041] First, the diameter of the paper drum body 1 is expanded to form an expanded end 12, so that the inner diameter of the expanded end 12 is larger than the outer diameter of the bottom plate 13. Then, the bottom plate 13, whose outer diameter is larger than the outer diameter of the paper drum body 1, is inserted into the expanded end 12. Finally, the expanded end 12 is rolled inward to press against the bottom plate 13, so that the bottom plate 13 can be sealed in the paper drum body 1 without damage. This not only ensures that the inner wall of the paper drum body 1 is a straight wall with a uniform inner diameter, but also improves the connection strength between the bottom plate 13 and the paper drum body 1, preventing it from falling off.

[0042] As shown in Figures 2 to 6, the expansion machine used in the sealing method of the expansion-mouth straight-wall type hot melt adhesive storage paper drum of the present invention includes: a platform 2, fixed to the ground, with a first through hole 21 opened on the platform 2; a plurality of compensation plates 22, evenly distributed around the first through hole 21 on the platform 2, each compensation plate 22 having a groove; a plurality of wedge-shaped sliders 3, slidably disposed in the grooves of the corresponding compensation plates 22, with tension springs 31 disposed between the corresponding wedge-shaped sliders 3 and the compensation plates 22, the outer end of the wedge-shaped sliders 3 being an arc-shaped forming wall 32. A dry arc forming wall 32 surrounds a circular forming wall. The initial outer diameter of the circular forming wall matches the inner diameter of the paper drum body 1. The wedge-shaped slider 3 slides outward, the circular forming wall expands in diameter, the wedge-shaped slider 3 slides inward, and the circular forming wall shrinks in diameter to return to its original position. Several wedge-shaped push blocks 23 are evenly distributed on the platform 2 around the first through hole 21 and are slidably connected to the platform 2. The inner end of each wedge-shaped push block 23 extends into the first through hole 21, and each wedge-shaped push block 23 pushes the wedge-shaped slider 3 in the adjacent two compensation plates 22 to slide outward. Several arc-shaped blocks 33, each arc-shaped block... 33 is fixed on the corresponding wedge-shaped slider 3. Several arc-shaped blocks 33 form a ring. The arc-shaped blocks 33 are located inside the arc-shaped forming wall 32 of the wedge-shaped slider 3. Each arc-shaped block 33 slides synchronously with the wedge-shaped slider 3. The pressure plate 4 abuts against all the compensation plates 22, the wedge-shaped sliders 3 and the wedge-shaped push blocks 23. The pressure plate 4 is connected to the compensation plates 22. The pressure plate 4 is located inside the ring formed by the arc-shaped blocks 33. A second through hole 41 concentric with the first through hole 21 is provided on the pressure plate 4. The punch 5 passes through the second through hole 41 and then engages with each wedge-shaped push block 23. When the inner ends are in contact, the punch 5 presses down and pushes each wedge-shaped push block 23 to slide outward simultaneously; two chucks 24 are symmetrically arranged on the platform 2 with the first through hole 21 as the center and are slidably engaged with the platform 2. The inner walls of the two chucks 24 are provided with first semi-circular holes 241. When the two chucks 24 are engaged, the two first semi-circular holes 241 are engaged to form a circular hole. An inner forming groove 242 is provided on the hole wall of the first semi-circular hole 241. The height difference H1 between the inner forming groove 242 and the arc forming wall 32 is equal to the wall thickness of the paper drum body 1 + the thickness of the metal ring 11.

[0043] The paper drum body 1, fitted with a metal ring 11, is fitted onto a circular forming wall formed by several wedge-shaped sliders 3. Then, two chucks 24 are engaged, with the circular hole formed by the engagement of the two chucks 24 abutting against the metal ring 11. The two chucks 24 are then locked in place. The punch 5 is pressed down, pushing each wedge-shaped push block 23 outwards synchronously. As the wedge-shaped push blocks 23 slide outwards, they push each wedge-shaped slider 3 against the tension of its corresponding tension spring 31, causing them to slide outwards synchronously. The arc-shaped blocks 33 connected to the wedge-shaped sliders 3 also slide outwards synchronously. The arc-shaped forming wall 32 on each wedge-shaped slider 3 pushes the paper drum body 1 and the metal ring 11 towards the inner forming groove 242 of the chuck 24, causing them to bend and expand in diameter. When the metal ring 11 abuts against the inner forming groove 242 of the chuck 24... When the forming groove 242 is in place, it indicates that the paper drum body 1 and the metal ring 11 have completed bending and expansion, forming an expanded end 12 on the paper drum body 1. At the same time, each arc block 33 cooperates with the round hole to abut against the unexpanded paper drum body 1 and the metal ring 11 for positioning. Then, the two chucks 24 separate and reset, the punch 5 rises, and each wedge slider 3 slides inward to reduce its diameter and reset under the tension of its corresponding tension spring 31. When the wedge slider 3 reduces its diameter and resets, it can drive the wedge push block 23 to reset together. When the arc block 33 reduces its diameter and resets to abut against the pressure plate 4, the wedge slider 3 is reset in place. When the chuck 24 and the wedge slider 3 are both reset in place, the expanded paper drum body 1 can be taken out from the expansion machine.

[0044] In this embodiment, both chucks 24 are driven by chuck cylinders 243. Two guide rails 25 are symmetrically arranged on the platform 2. Each chuck 24 is provided with a slider 244 that slides and engages with the guide rails 25. The chucks 24 are precisely guided by the cooperation between the guide rails 25 and the sliders 244.

[0045] In this embodiment, two wedge-shaped surfaces are symmetrically arranged at the outer end of the wedge-shaped push block 23. The two side walls of the arc-shaped forming wall 32 of the wedge-shaped slider 3 press against the wedge-shaped surfaces of the two adjacent wedge-shaped push blocks 23. When the wedge-shaped push block 23 slides outward, it can push the corresponding wedge-shaped slider 3 outward through the wedge-shaped surface on the wedge-shaped push block 23. When the wedge-shaped slider 3 is reduced in diameter and reset, it pushes the corresponding wedge-shaped push block 23 inward through the side wall on the arc-shaped forming wall 32. An inclined top surface 231 is provided at the inner end of the wedge-shaped push block 23, which is inclined from bottom to top and from inside to outside. The punch 5 is inverted conical in shape. Several inclined surfaces 51 are evenly distributed around the outer side wall of the punch 5. Each inclined surface 51 is attached to the inclined top surface 231 of a wedge-shaped push block 23, thereby improving the pushing stability of the punch 5 on each wedge-shaped push block 23.

[0046] In this embodiment, a first tension spring rod 221 is provided on the compensation plate 22, and a second tension spring rod 34 is provided on the wedge-shaped slider 3. Several elongated holes 42 and tension spring holes 43 are evenly distributed around the circumference of the pressure plate 4. The first tension spring rod 221 passes upward through the tension spring hole 43, and the second tension spring rod 34 passes upward through the elongated hole 42. The two ends of the tension spring 31 are respectively fixed to the first tension spring rod 221 and the second tension spring rod 34. When the pressure plate 4 limits the movement of the wedge-shaped slider 3 and the wedge-shaped push block 23, it will not interfere with the tension spring 31.

[0047] The expanded paper drum body 1 needs to be placed on a bottom sealing and edge-rolling machine for bottom sealing, as shown in Figures 7 to 11. The bottom sealing and edge-rolling machine includes: a base 6, fixed to the ground, with a third through hole 61 on the base 6; two positioning plates 62, symmetrically arranged on the base 6 with the third through hole 61 as the center and slidably engaged with the base 6, each of the two positioning plates 62 having a semi-flared hole 621 on its inner wall, the smaller diameter end of the semi-flared hole 621 being located at the top, the two positioning plates 62 being aligned, the two semi-flared holes 621 being aligned to form a flared hole, the inner diameter of the smaller diameter end of the flared hole being adapted to the inner diameter of the bottom plate 13; a tray 63, lifted and positioned in the base 6, the tray 63 being vertically aligned with the aligned flared hole; and a load-bearing plate 64, fixed on the base 6, located above the positioning plates 62, with openings on the load-bearing plate 64. A fourth through hole 641 is provided; two clamping discs 65 are symmetrically arranged on the load-bearing plate 64 with the fourth through hole 641 as the center and are slidably engaged with the bottom wall of the load-bearing plate 64. A second semi-circular hole 651 is provided on the inner wall of each of the two clamping discs 65. The two clamping discs 65 are aligned, and the two second semi-circular holes 651 are aligned to form a clamping hole. The clamping hole is aligned with the trumpet-shaped hole on the top and bottom axis. The diameter D of the clamping hole is equal to the outer diameter of the paper drum body 1 + the outer diameter of the metal ring 11. The height difference H2 between the second semi-circular hole 651 and the positioning disc 62 is equal to the height of the expansion end 12. The height of the expansion end 12 mentioned here is the height before the edge is rolled. A rolling die 66 is raised and lowered in the machine base 6. The rolling die 66 is provided with a clearance hole 661 that can accommodate the tray 63. The rolling die 66 is provided with a rolling groove 662 that cooperates with the expansion end 12.

[0048] First, place the base plate 13 on the pallet 63. Then, lock the two positioning discs 62 together. After the paper drum body 1 passes through the fourth through hole 641 of the load-bearing plate 64, place it vertically on the two positioning discs 62. The expanded diameter end 12 on the paper drum body 1 abuts against the positioning discs 62 for support. Then, the two clamping discs 65 clamp the metal ring 11 of the paper drum body 1. The second semi-circular holes 651 on the two clamping discs 65 abut against the outer top wall of the expanded diameter end 12. Then, drive the pallet 63 to rise. The base plate 13 on the pallet 63 passes through the flared hole and abuts against the inner top wall of the expanded diameter end 12. When the base plate 13 passes through the flared hole, it will... The device automatically adjusts its position under the limiting position of the small diameter end of the flared hole, so that the bottom plate 13 is coaxially aligned with the paper drum body 1. The tray 63 remains in an upward pushing state. The two positioning plates 62 separate, driving the curling mold 66 to rise. The curling groove 662 on the curling mold 66 abuts against the expanding end 12. When the curling mold 66 rises, the curling groove 662 applies pressure to the expanding end 12. The expanding end 12 will not rise under the limiting position of the clamping plate 65, so that the expanding end 12 is pressed and curled inward to form a curled edge. The curled edge abuts against the bottom plate 13 and presses the bottom plate 13 firmly. The curled edge, together with the inner top wall of the expanding end 12, seals the bottom plate 13, completing the bottom sealing. After the bottom sealing is completed, the worker grasps the paper drum body 1, the two clamping plates 65 separate, and the curling mold 66 and the tray 63 descend and reset in sequence. The worker can then remove the paper drum body 1 after the bottom sealing is completed.

[0049] In this embodiment, several hemming cylinders 663 and one push cylinder 631 are evenly distributed around the circumference of the base 6. The piston rod of the push cylinder 631 is connected to the tray 63. A receiving seat 664 is connected to the bottom of the hemming mold 66. The receiving seat 664 is connected to the piston rod of each hemming cylinder 663. A relief groove 6641 communicating with the relief hole 661 is provided in the receiving seat 664. The inner diameter of the relief groove 6641 is not less than the diameter of the relief hole 661. A through hole 6642 communicating with the relief groove 6641 is provided on the bottom wall of the receiving seat 664. The push cylinder 631 is located in the through hole 6642. The pallet 63 can be driven to rise and fall by the push cylinder 631. The clearance hole 661 is provided in the crimping die 66, and the clearance groove 6641 is provided in the receiving seat 664, so as not to interfere with the rise and fall of the pallet 63. The through hole 6642 is provided in the receiving seat 664 so as not to interfere with the connection between the push cylinder 631 and the pallet 63.

[0050] In this embodiment, the outer wall of the hemming groove 662 is higher than the inner wall. A guide wall 6621, which bends outward, is provided on the inner wall. The angle α between the guide wall 6621 and the outer wall of the hemming mold 66 is 4° to 6°. When the expanding end 12 contacts the hemming groove 662, the outer wall being higher than the inner wall ensures that the expanding end 12 rolls inward. The guide wall 6621, which bends outward, ensures that the expanding end 12 rolls outward and diagonally upward. This ensures that the hemmed edge formed by the hemming groove 662 presses against the base plate 13 and compacts it. Controlling the angle α between the guide wall 6621 and the outer wall of the hemming mold 66 to 4° to 6° ensures that the opening of the hemming groove 662 is greater than the hemmed edge width. When the hemming mold 66 descends, the hemming groove 662 will not interfere with the hemmed edge.

[0051] In this embodiment, two positioning disks 62 are respectively connected to two positioning cylinders 622, and two clamping disks 65 are respectively connected to two clamping cylinders 652. The moving direction of the two positioning disks 62 is perpendicular to the moving direction of the two clamping disks 65, so that the positioning cylinders 622 and the clamping cylinders 652 are misaligned to prevent interference. The sliding engagement structure between the positioning disk 62 and the base 6, and the sliding engagement structure between the clamping disk 65 and the load-bearing plate 64 are existing technologies and will not be described in detail here.

[0052] The connection structure between the clamping disc 65 and the clamping cylinder 652 is as follows: two rotating seats 653 are symmetrically arranged on the clamping disc 65, and a rotating shaft 654 is inserted between the two rotating seats 653. The piston rod on the clamping cylinder 652 is fixedly connected to the rotating shaft 654. Due to errors in the manufacturing and assembly process of the clamping disc 65 and the load-bearing plate 64, the clamping disc 65 may not be able to truly rest against the load-bearing plate 64. Furthermore, during edge rolling, the clamping disc 65 may move slightly when subjected to an upward thrust. The clamping cylinder 652 is directly connected to the clamping plate 65. When the clamping plate 65 moves slightly, it will cause the piston rod of the clamping cylinder 652 to shift. Over time, the clamping cylinder 652 is prone to leakage due to wear. However, by setting an additional rotating connection structure between the clamping plate 65 and the clamping cylinder 652, a rotating shaft 654 and a rotating seat 653 are provided. This will prevent the piston rod of the clamping cylinder 652 from being affected when the clamping plate 65 moves, thereby improving the service life of the clamping cylinder 652.

[0053] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for sealing the bottom of a straight-walled, bulging-mouth hot melt adhesive storage paper drum, characterized in that: Includes the following steps: S1. Fit a metal ring onto any end of the paper drum body. Place the end with the metal ring into the expanding machine, which expands the diameter of this end, forming an expanded end on the paper drum body. S2. Place the bottom plate on the tray of the bottom sealing and edge-coating machine, then place the expanded paper drum body onto the bottom sealing and edge-coating machine. The expanded end of the paper drum body abuts against the bottom sealing and edge-coating machine, which clamps the paper drum body. The tray feeds the bottom plate upwards into the expanded end, where the bottom plate abuts against the inner top wall of the expanded end. S3. The edge-coating die in the bottom sealing and edge-coating machine moves upwards. After the edge-coating die contacts the expanded end of the paper drum body, it turns the expanded end inwards. The roll is formed into a rolled edge, which abuts against the bottom plate. The rolled edge, together with the inner top wall of the expanded diameter end, seals the bottom plate, completing the bottom sealing. The expanded diameter machine includes: a platform fixed to the ground, with a first through hole; several compensation plates evenly distributed around the first through hole on the platform, each compensation plate having a groove; several wedge-shaped sliders slidably disposed in the grooves of corresponding compensation plates, with tension springs between the corresponding wedge-shaped sliders and compensation plates. The outer ends of the wedge-shaped sliders are formed into arc-shaped molding walls, which together form a circular molding wall. The initial outer diameter of the circular molding wall is compatible with the inner diameter of the paper drum body. The system consists of a wedge-shaped slider sliding outwards, a circular forming wall expanding in diameter, a wedge-shaped slider sliding inwards, and a circular forming wall shrinking in diameter to return to its original position. Several wedge-shaped push blocks are evenly distributed around the first through hole on the platform and slidably connected to it. The inner end of each wedge-shaped push block extends into the first through hole, and each push block pushes the wedge-shaped slider in the adjacent two compensation plates outwards. Several arc-shaped blocks are fixed to their corresponding wedge-shaped sliders, forming a ring. The arc-shaped blocks are located inside the arc-shaped forming wall of the wedge-shaped slider, and each arc-shaped block slides synchronously with the wedge-shaped slider. A pressure plate abuts against all the compensation plates, wedge-shaped sliders, and wedge-shaped push blocks. The compensating plates are connected, and the pressure plate is located inside the ring formed by the arc-shaped blocks. A second through hole concentric with the first through hole is provided on the pressure plate. The punch passes through the second through hole and contacts the inner end of each wedge-shaped push block. The punch presses down and pushes each wedge-shaped push block to slide outward synchronously. Two chucks are symmetrically arranged on the platform with the first through hole as the center and slide and engage with the platform. Each of the two chucks has a first semi-circular hole on its inner wall. When the two chucks are aligned, the two first semi-circular holes are aligned to form a circular hole. An inner forming groove is provided on the hole wall of the first semi-circular hole. The height difference between the inner forming groove and the arc-shaped forming wall is equal to the wall thickness of the paper drum body plus the thickness of the metal ring.

2. The sealing method for the bottom of the expansion-mouth straight-wall type hot melt adhesive storage paper drum according to claim 1, characterized in that: In S2, the bottom sealing and edge rolling machine is clamped on the metal ring at the expanded diameter end and abuts against the outer top wall of the expanded diameter end.

3. The sealing method for the bottom of the expansion-mouth straight-wall type hot melt adhesive storage paper drum according to claim 1, characterized in that: In S2, the single-sided distance between the base plate and the expanded diameter end shall not exceed 0.5mm.

4. The sealing method for the bottom of the expansion-mouth straight-wall type hot melt adhesive storage paper drum according to claim 1, characterized in that: Two wedge-shaped surfaces are symmetrically arranged at the outer end of the wedge-shaped push block. The two side walls of the arc-shaped forming wall of the wedge-shaped slider press against the wedge-shaped surfaces of the two adjacent wedge-shaped push blocks. An inclined top surface is provided at the inner end of the wedge-shaped push block, which slopes from bottom to top and from inside to outside. The punch is inverted conical in shape. Several inclined surfaces are evenly distributed around the outer side wall of the punch. Each inclined surface is attached to the inclined top surface of a wedge-shaped push block.

5. The sealing method for the bottom of the expansion-mouth straight-wall type hot melt adhesive storage paper drum according to claim 1, characterized in that: A first tension spring rod is provided on the compensation plate, and a second tension spring rod is provided on the wedge-shaped slider. Several elongated holes and tension spring holes are evenly distributed around the circumference of the pressure plate. The first tension spring rod passes upward through the tension spring hole, and the second tension spring rod passes upward through the elongated hole. The two ends of the tension spring are fixed to the first tension spring rod and the second tension spring rod, respectively.

6. The sealing method for the bottom of the expansion-mouth straight-wall type hot melt adhesive storage paper drum according to any one of claims 1 to 5, characterized in that: The bottom sealing and edge rolling machine further includes: a base, fixed to the ground, with a third through hole; two positioning discs, symmetrically arranged on the base with the third through hole as the center and slidably engaged with the base, each positioning disc having a semi-flared hole on its inner wall, the smaller diameter end of the semi-flared hole being at the top; the two positioning discs aligning, the two semi-flared holes aligning to form a flared hole, the inner diameter of the smaller diameter end of the flared hole matching the inner diameter of the base plate; a tray, lifted and positioned in the base, the tray aligned vertically with the aligned flared hole; and a load-bearing plate, fixed to the base, positioned above the positioning discs, with the load-bearing plate... It has a fourth through hole; two clamping discs are symmetrically arranged on the load-bearing plate with the fourth through hole as the center and are slidably engaged with the bottom wall of the load-bearing plate. Each clamping disc has a second semi-circular hole on its inner wall. When the two clamping discs are aligned, the two second semi-circular holes are aligned to form a clamping hole. The clamping hole and the trumpet-shaped hole are aligned coaxially. The diameter of the clamping hole = the outer diameter of the paper drum body + the outer diameter of the metal ring. The height difference between the second semi-circular hole and the positioning disc = the height of the expansion end; a curling die is lifted and set in the machine base. The curling die has a clearance hole that can accommodate the pallet and a curling groove that matches the expansion end.

7. The sealing method for the bottom of the expansion-mouth straight-wall type hot melt adhesive storage paper drum according to claim 6, characterized in that: Several hemming cylinders and one push cylinder are evenly distributed around the circumference of the machine base. The piston rod of the push cylinder is connected to the tray. A receiving seat is connected to the bottom of the hemming die. The receiving seat is connected to the piston rod of each hemming cylinder. A relief groove communicating with the relief hole is opened in the receiving seat. The inner diameter of the relief groove is not less than the diameter of the relief hole. A through hole communicating with the relief groove is provided on the bottom wall of the receiving seat. The push cylinder is located in the through hole.

8. The sealing method for the bottom of the expansion-mouth straight-wall type hot melt adhesive storage paper drum according to claim 6, characterized in that: The outer wall of the hemming groove is higher than the inner wall. A guide wall that bends outward is provided on the inner wall. The angle between the guide wall and the outer wall of the hemming die is 4° to 6°.

9. A hot melt adhesive storage paper drum with an inflated opening and straight wall, manufactured by the sealing method of any one of claims 1 to 3, characterized in that: include: The paper drum body has metal rings fitted at both the top and bottom ends. The upper end of the paper drum body and the metal ring at the top end are rolled at the edge. The inner diameter of the upper end of the paper drum body is larger than the inner diameter of the paper drum body. The lower end of the paper drum body and the metal ring at the lower end are folded outward to form an expanded diameter end. The expanded diameter end is rolled inward to form an installation groove. A bottom plate is sealed and fitted in the installation groove. The inner wall of the paper drum body above the bottom plate is a straight wall with a uniform inner diameter.

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