Expanding opening straight wall type hot melt adhesive storage paper barrel and bottom sealing method thereof

Abstract

The invention relates to the field of paper barrel manufacturing, and particularly discloses an expanded straight wall type hot melt adhesive storage paper barrel and a bottom sealing method thereof.The bottom sealing method comprises the following steps that S1, a barrel body of the paper barrel is sleeved with a metal ring, and the end, sleeved with the metal ring, of the paper barrel is placed in a diameter expanding machine for diameter expanding so that a diameter expanding end can be formed on the barrel body of the paper barrel; s2, the bottom plate is placed on a tray in a bottom sealing and curling machine, then the barrel body of the paper barrel is placed on the bottom sealing and curling machine, the bottom sealing and curling machine clamps the barrel body of the paper barrel, and the tray conveys the bottom plate upwards into the diameter expanding end; and S3, a curling die in the bottom sealing curling machine moves upwards, the curling die curls the expanded end, a curled edge abuts against the bottom plate, the curled edge is matched with the inner top wall of the expanded end to seal the bottom plate, and bottom sealing is completed. The paper barrel bottom sealing device has the advantages that operation is convenient, the bottom sealing quality is good, due to the fact that the inner wall of the barrel body of the paper barrel is the straight wall with the uniform inner diameter, the pressing disc piston can descend to the bottom plate, hot melt glue is completely discharged, and glue waste is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paper barrel manufacturing, in particular to an inflation port straight wall type hot melt adhesive storage paper barrel and a bottom sealing method thereof. BACKGROUND

[0002] In recent years, the application range of paper barrels is becoming wider and wider, not only can they store solid products, but also can store liquid products, among which there is a special product, hot melt adhesive. The hot melt adhesive will condense into a solid state at room temperature, and will form a high-viscosity liquid state after being heated to a high temperature of about 180 DEG C. When unloading, a pressure disc piston is needed to be used in cooperation, an electric heating mechanism is arranged in the pressure disc piston, a sealing ring is arranged on the side wall of the pressure disc piston, and a liquid discharge pipe penetrating through the top wall and the bottom wall is arranged on the pressure disc piston. The pressure disc piston extends into the paper barrel, the sealing ring on the pressure disc piston is sealed and fitted with the inner wall of the paper barrel, and the electric heating mechanism heats the pressure disc piston. The hot melt adhesive in a solid state is heated to a liquid state by the heated pressure disc piston. When the pressure disc piston is pressed in the paper barrel, the hot melt adhesive in a liquid state will be discharged from the liquid discharge pipe under the action of pressure.

[0003] In order to cooperate with the pressure disc piston, the paper barrels with inflation port structure are generally used to store hot melt adhesive on the market. In order to improve the strength of the upper and lower ends of the paper barrel, a metal ring is sleeved on the upper and lower ends of the paper barrel when the paper barrel with inflation port structure is produced. In order to prevent the upper end port of the paper barrel from interfering with the pressure disc piston, the upper and lower end ports of the paper barrel are usually rolled edge to complete the inflation port together with the metal ring, so that an inverted corner is formed between the upper and lower end ports and the inner wall of the paper barrel. In order to seal the bottom, a rolling edge device is needed to roll edge the paper barrel with a metal ring sleeved on any one end, so as to form a convex table inward on the paper barrel. Then, a bottom plate is installed on the bottom of the paper barrel in an interference fit and abuts against the convex table. The convex table plays a positioning role, and the bottom plate and the paper barrel are sealed by interference fit. However, the paper barrel with this structure has a problem. Since there is a convex table inward on the bottom of the paper barrel, the pressure disc piston will be limited by the convex table and cannot reach the bottom plate completely, so that the hot melt adhesive will be left in the paper barrel, causing waste.

[0004] Therefore, in order to enable the pressure disc piston to run to the bottom, it is necessary to ensure that the paper barrel is straight-walled. A paper barrel with detachable covers installed on the upper and lower ends appears on the market. In this way, it is not necessary to roll edge the bottom of the paper barrel to form a convex table, so that the pressure disc piston can run to the bottom to discharge all the hot melt adhesive in the paper barrel, without the problem of residue. However, since the connection between the cover and the paper barrel is a detachable connection structure, the connection strength between the two is unstable. After the hot melt adhesive is filled, the cover at the bottom is prone to falling off due to heavy pressure, resulting in the spilling of the hot melt adhesive. SUMMARY

[0005] The application aims to provide an expanded-mouth straight-wall type hot melt adhesive storage paper barrel and a bottom sealing method thereof.

[0006] To achieve the above-mentioned purpose, the application adopts the technical solution of a bottom sealing method of an expanded-mouth straight-wall type hot melt adhesive storage paper barrel, comprising the following steps: S1, fitting a metal ring at any end of the barrel body of the paper barrel, placing the end fitted with the metal ring in a diameter expander to expand the diameter of the end of the barrel body of the paper barrel; S2, placing a bottom plate on a tray in a bottom sealing crimper, placing the barrel body of the paper barrel after diameter expansion on the bottom sealing crimper, and abutting the expanded end against the bottom sealing crimper to clamp the barrel body of the paper barrel, the tray sending the bottom plate upward into the expanded end, and the bottom plate abutting against the inner top wall of the expanded end; S3, the crimper die in the bottom sealing crimper moves upward, after the crimper die contacts the expanded end of the barrel body of the paper barrel, the expanded end is inwardly rolled to form a crimp, the crimp abuts against the bottom plate, and the crimp seals the bottom plate in cooperation with the inner top wall of the expanded end to complete the bottom sealing.

[0007] Further, the aforementioned bottom sealing method of the expanded-mouth straight-wall type hot melt adhesive storage paper barrel, wherein in S2, the bottom sealing crimper clamps the metal ring at the expanded end and abuts against the outer top wall of the expanded end.

[0008] Further, the aforementioned bottom sealing method of the expanded-mouth straight-wall type hot melt adhesive storage paper barrel, wherein in S2, the single-side spacing between the bottom plate and the expanded end is not more than 0.5 mm.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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 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°.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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

[0019] Figure 1 This is a schematic diagram of the structure of the expansion-mouth straight-wall type hot melt adhesive storage paper drum described in this invention.

[0020] Figure 2 This 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 described in this invention.

[0021] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure along the AA direction.

[0022] Figure 4 yes Figure 2 A schematic diagram of the structure after removing the punch, platen, pressure plate, and chuck.

[0023] Figure 5 yes Figure 4 A schematic diagram of the structure after removing the arc-shaped blocks.

[0024] Figure 6 This is a schematic diagram of the structure of a paper drum after it has been expanded by an expanding machine.

[0025] Figure 7 This 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 described in this invention.

[0026] Figure 8 yes Figure 7 A schematic diagram of the connection structure between the positioning plate and the base.

[0027] Figure 9 yes Figure 7 A schematic diagram of the connection structure between the middle clamping plate and the bottom wall of the load-bearing plate.

[0028] Figure 10 yes Figure 7 A schematic diagram of the structure of the edge-rolling die.

[0029] Figure 11 This is a schematic diagram of the structure when a paper drum is expanded and placed on a bottom sealing and edge rolling machine. Detailed Implementation

[0030] The technical solution of the present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0031] like Figure 1 As shown, 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 clamped 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.

[0032] 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.

[0033] 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: 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. 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. 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. 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.

[0034] 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.

[0035] like Figures 2-6As shown, the expanding 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 compensating plates 22, evenly distributed on the platform 2 around the first through hole 21, each compensating plate 22 having a groove; a plurality of wedge-shaped sliders 3, slidably disposed in the grooves of the corresponding compensating plates 22, with tension springs 31 disposed between the corresponding wedge-shaped sliders 3 and the compensating plates 22, the outer end of the wedge-shaped sliders 3 being an arc-shaped forming wall 32, and the plurality of arc-shaped... The molded wall 32 forms a circular molding wall, the initial outer diameter of which matches the inner diameter of the paper drum body 1. The wedge-shaped slider 3 slides outward, the circular molding wall expands in diameter, the wedge-shaped slider 3 slides inward, and the circular molding 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 are fixed. A series of arc-shaped blocks 33 are fixed on the corresponding wedge-shaped slider 3, forming a ring. The arc-shaped blocks 33 are located inside the arc-shaped forming wall 32 of the wedge-shaped slider 3, and 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 slider 3 and the wedge-shaped push block 23. The pressure plate 4 is connected to the compensation plate 22 and 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 meets the inner end of each wedge-shaped push block 23. When they come into contact, the punch 5 presses down and pushes each wedge-shaped push block 23 outward in sync; 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] After the paper drum body 1 has been expanded, it needs to be placed on a bottom sealing and edge-rolling machine for bottom sealing, such as... Figures 7-11 As shown, 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 positioning plate 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 base plate 13; a tray 63, lifted and disposed in the base 6, the tray 63 being vertically aligned with the aligned flared hole; a load-bearing plate 64, fixed to the base 6, the load-bearing plate 64 being located above the positioning plates 62, with a fourth through hole 641 on the load-bearing plate 64; and two clamping plates 6... 5. Symmetrically arranged on the load-bearing plate 64 with the fourth through hole 641 as the center and slidably engaged with the bottom wall of the load-bearing plate 64. The inner walls of the two clamping discs 65 are provided with second semi-circular holes 651. The two clamping discs 65 are aligned, and the two second semi-circular holes 651 are aligned to form clamping holes. The clamping holes are aligned with the trumpet-shaped holes vertically and horizontally. The diameter D of the clamping holes 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. The edge rolling mold 66 is lifted and set in the machine base 6. The edge rolling mold 66 is provided with a clearance hole 661 that can accommodate the tray 63. The edge rolling mold 66 is provided with an edge rolling groove 662 that cooperates with the expansion end 12.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 of sealing the bottom of a paper drum for storing hot melt adhesive in the form of a straight-walled, flared mouth, characterized in that: The method comprises the following steps: S1, any one end of the paper barrel body is sleeved with a metal ring, and the end sleeved with the metal ring is placed in a diameter expander to expand the diameter to form an expanded end on the paper barrel body; S2, the bottom plate is placed on a tray in a bottom sealing crimper, the paper barrel body with the expanded end is placed on the bottom sealing crimper, and the expanded end is abutted on the bottom sealing crimper to clamp the paper barrel body, the tray sends the bottom plate upward into the expanded end, and the bottom plate is abutted on the inner top wall of the expanded end; S3, the crimper die in the bottom sealing crimper moves upward, the crimper die contacts the expanded end of the paper barrel body, the expanded end is inwardly rolled to form a crimp, the crimp is abutted on the bottom plate, the crimp seals the bottom plate in cooperation with the inner top wall of the expanded end, and the bottom sealing is completed.

2. The method of claim 1, wherein the method further comprises: providing a bottom sheet having a first edge and a second edge; and sealing the first edge of the bottom sheet to the first edge of the sidewall sheet. 2 In S2, the bottom sealing crimper is clamped on the metal ring of the expanded end and abutted on the outer top wall of the expanded end.

3. The method of claim 1, wherein the method further comprises: In S2, the unilateral spacing between the bottom plate and the expanded end is not more than 0.5 mm.

4. A machine for expanding the diameter of the bottom of a paper barrel for storing hot melt adhesive in the form of a bellied mouth and straight walled barrel according to any one of claims 1 to 3, characterised in that: The method comprises the following steps: A base plate is fixed to the ground, and a first through hole is formed in the base plate; A plurality of compensation plates are evenly distributed on the base plate with the first through hole as the center, and a sliding groove is formed in each compensation plate; A plurality of wedge-shaped sliding blocks are slidingly arranged in the sliding grooves of the corresponding compensation plates, a tension spring is arranged between the corresponding wedge-shaped sliding block and the compensation plate, the outer end of the wedge-shaped sliding block is provided with an arc-shaped forming wall, a plurality of arc-shaped forming walls form a circular forming wall, the initial outer diameter of the circular forming wall is matched with the inner diameter of the paper barrel body, the wedge-shaped sliding block slides outward, the circular forming wall is expanded to form, the wedge-shaped sliding block slides inward, and the circular forming wall is reset to a smaller diameter; A plurality of wedge-shaped push blocks are evenly distributed on the base plate with the first through hole as the center and are slidingly connected with the base plate, the inner end of each wedge-shaped push block extends into the first through hole, and each wedge-shaped push block pushes the wedge-shaped sliding blocks in the adjacent two compensation plates to slide outward; A plurality of arc-shaped blocks are fixed to the corresponding wedge-shaped sliding blocks, the arc-shaped blocks form a circular ring, the arc-shaped blocks are located on the inner side of the arc-shaped forming wall of the wedge-shaped sliding block, and each arc-shaped block slides synchronously with the wedge-shaped sliding block; A pressing plate is abutted on all the compensation plates, wedge-shaped sliding blocks and wedge-shaped push blocks, the pressing plate is connected with the compensation plates, the pressing plate is located in the circular ring formed by the arc-shaped blocks, and a second through hole concentric with the first through hole is formed in the pressing plate; A punch passes through the second through hole and is in contact with the inner end of each wedge-shaped push block, and the punch pushes each wedge-shaped push block to slide outward synchronously. Two chucks are symmetrically arranged on the base plate with the first through hole as the center and are slidingly connected with the base plate, the inner wall of each chuck is provided with a first semicircular hole, the two first semicircular holes are combined to form a circular hole, an inner forming groove is formed on the hole wall of the first semicircular hole, and the height difference between the inner forming groove and the arc-shaped forming wall is equal to the wall thickness of the paper barrel body plus the thickness of the metal ring.

5. The expanding machine for the bottom sealing method of the heat-fusing adhesive storage paper barrel with flared mouth and straight wall according to claim 4, characterized in that: Two wedge-shaped surfaces are symmetrically arranged on the outer end of the wedge-shaped push block, the two side walls of the arc-shaped forming wall of the wedge-shaped sliding block are respectively abutted on the wedge-shaped surfaces on the adjacent two wedge-shaped push blocks, a slanted top surface is arranged on the inner end of the wedge-shaped push block from bottom to top and from inside to outside, the punch is in the shape of an inverted cone, a plurality of inclined surfaces are evenly distributed on the outer side wall of the punch, and each inclined surface is abutted on the slanted top surface of one wedge-shaped push block.

6. The expanding machine for the bottom sealing method of the heat-fusing adhesive storage paper barrel with flared mouth and straight wall according to claim 4, characterized in that: First tension spring rod is arranged on the compensation plate, second tension spring rod is arranged on the wedge-shaped sliding block, a plurality of long hole and tension spring hole are uniformly distributed on the pressing plate, first tension spring rod passes through tension spring hole upwards, second tension spring rod passes through long hole upwards, both ends of tension spring are fixed on first tension spring rod and second tension spring rod respectively.

7. A bottom-sealing and flanging machine for use in the bottom-sealing method of the straight-walled heat-melt adhesive storage paper barrel according to any one of claims 1 to 3, characterized in that: Also include: Machine base is fixed to the ground, third through hole is formed in the machine base; Two positioning discs are symmetrically arranged on the machine base with the third through hole as the center and are slidably connected with the machine base, a half-horn-shaped hole is arranged on the inner wall of each positioning disc, the small-diameter end of the half-horn-shaped hole is located above, the two half-horn-shaped holes are closed to form a horn-shaped hole, the inner diameter of the small-diameter end of the horn-shaped hole is matched with the inner diameter of the bottom plate; A tray is arranged in the machine base in a lifting manner, the tray is aligned with the closed horn-shaped hole in an up-down direction; A bearing plate is fixed on the machine base, the bearing plate is located above the positioning disc, a fourth through hole is formed in the bearing plate; Two clamping discs are symmetrically arranged on the bearing plate with the fourth through hole as the center and are slidably connected with the bottom wall of the bearing plate, a second half-circular hole is arranged on the inner wall of each clamping disc, the two second half-circular holes are closed to form a clamping hole, the clamping hole is coaxially aligned with the horn-shaped hole in an up-down direction, the diameter of the clamping hole is equal to the outer diameter of the paper barrel body plus the outer diameter of the metal ring, the height difference between the second half-circular hole and the positioning disc is equal to the height of the enlarged end; A flanging die is arranged in the machine base in a lifting manner, an avoiding hole capable of accommodating the tray is arranged in the flanging die, and a flanging groove matched with the enlarged end is arranged in the flanging die.

8. The bottom seaming machine for use in the bottom sealing method of the heat- adhesive storage paper drum of the flared-mouth straight-wall type according to claim 7, characterized in that: A plurality of flanging oil cylinders and a pushing oil cylinder are uniformly distributed on the machine base in a circumferential direction, the piston rod of the pushing oil cylinder is connected with the tray, a receiving seat is connected to the bottom of the flanging die, the receiving seat is connected with the piston rods of the flanging oil cylinders, an avoiding groove is formed in the receiving seat and is connected with the avoiding hole, the inner diameter of the avoiding groove is not less than the diameter of the avoiding hole, a through hole is formed in the bottom wall of the receiving seat and is connected with the avoiding groove, and the pushing oil cylinder is located in the through hole.

9. The bottom seaming machine for use in the bottom sealing method of the expanded- mouth straight-wall type hot-melt adhesive storage paper drum according to claim 7, characterized in that: The outer groove wall of the flanging groove is higher than the inner groove wall, a guide wall is arranged on the inner groove wall and is bent towards the outer groove wall, and the included angle between the guide wall and the outer side wall of the flanging die is 4°-6°.

10. The expanded mouth and straight wall type hot melt adhesive storage paper bucket manufactured by the bottom sealing method of the expanded mouth and straight wall type hot melt adhesive storage paper bucket according to any one of claims 1 to 3, characterized by: The paper barrel body, the metal ring is sleeved on the upper and lower ends of the paper barrel body, the upper end of the paper barrel body is crimped with the metal ring, the inner diameter of the upper end of the paper barrel body is larger than the inner diameter of the paper barrel body, the lower end of the paper barrel body is outwardly folded to form an enlarged end, the inner wall of the paper barrel body above the bottom plate is a straight wall with uniform inner diameter. ​

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