Structure for assembling foaming silicone tube and metal shaft core

Abstract

The utility model relates to the technical field of foaming silicone tube and metal shaft core assembling equipment, in particular to a structure for assembling a foaming silicone tube and a metal shaft core, which comprises an outer cylinder, an inner cylinder, a mounting head and a sealing plug component. A containing cavity used for containing a foaming silicone tube is formed in the inner cylinder, a mounting part used for mounting the foaming silicone tube is arranged on the mounting head, a through hole allowing a metal shaft core to penetrate through is formed in the mounting part, the inner cylinder is sleeved with the outer cylinder, and a gap is reserved between the outer cylinder and the inner cylinder. A suction hole is formed in the outer cylinder, and a plurality of air holes are formed in the inner cylinder; the structure for assembling the foaming silicone tube and the metal shaft core has the advantages that the foaming silicone tube is fully and uniformly expanded, the sealing reliability is high, and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment for assembling a foamed silicone tube and a metal shaft core, in particular to a structure for assembling a foamed silicone tube and a metal shaft core. Background Art

[0002] In the prior art, when producing some copier fixing pressure rollers, it is necessary to assemble a foamed silicone tube with a metal shaft core. Figure 1 As shown, the existing assembly structure consists of three parts: a positioning plug mounting head, a metal cylinder, and a sealing silicone pad. The outer diameter of the positioning plug mounting head's lower end forms an interference fit with the inner hole of the foam silicone tube, which also forms a seal with the inner hole of the metal cylinder. An air hole is provided in the center of the mounting head for the metal shaft to pass through, and a 2mm air hole is opened in the middle of the cylinder body to accommodate the air compressor suction cup. The sealing silicone pad is formed by naturally leveling liquid silicone and then high-temperature vulcanization to ensure the airtightness of the lower end of the metal cylinder. The cooperation between the three parts directly creates a vacuum environment between the foam silicone tube and the metal cylinder, causing the foam silicone tube to expand under the influence of negative pressure.

[0003] However, when the above assembly structure is vacuumed, air outflow is concentrated at a single point, causing the silicone foam tube to tilt within the metal cylinder. The adhesive applied to the metal core scrapes against the inner wall of the silicone foam tube during its fall, resulting in poor adhesion at the bottom. Some silicone foam tubes with lower hardness can partially deform and adhere to the inner wall of the metal cylinder during vacuuming, blocking the vent holes and causing poor expansion. The silicone foam tube also lacks a separate sealing structure at its lower end. When the air compressor is turned on, some air flows through the inner hole of the silicone foam tube, causing the actual negative pressure inside the metal cylinder to drop, affecting the expansion effect.

[0004] Patent document with application number 202321173842.8 discloses a fixing roller forming mold, which discloses a mold barrel and a necking assembly. The mold barrel and the necking assembly are both provided with a mold cavity for placing the fixing roller core. The necking assembly includes a first necking part and a second necking part respectively arranged at both ends of the mold barrel. The inner walls of the first necking part and the second necking part are both provided with a protrusion protruding outward toward the axial direction thereof, and the protrusion is located at the end of the first necking part or the second necking part away from the mold barrel; its expansion effect is poor. Utility Model Content

[0005] The utility model provides a structure for assembling a foamed silicone tube and a metal shaft core, aiming to solve the problems of tilting and uneven expansion of the foamed silicone tube in the metal cylinder in the existing assembly structure.

[0006] In order to achieve the above-mentioned purpose, the utility model proposes a structure for assembling a foamed silicone tube and a metal shaft core, comprising: an outer tube, an inner tube, a mounting head and a sealing plug assembly, the two ends of the inner tube are respectively sealed with the mounting head and the sealing plug assembly, the inner tube is provided with a accommodating cavity for placing the foamed silicone tube, the mounting head is provided with a mounting portion for mounting the foamed silicone tube, the mounting portion is provided with a through hole for the metal shaft core to pass through, the outer side of the inner tube is sleeved with the outer side of the inner tube, a gap is left between the outer tube and the inner tube, the outer tube is provided with a suction hole, and the inner tube is provided with a plurality of air holes. The double-layer porous structure allows air to be evenly sucked out from the suction holes. When some pores are blocked by the deformed foam silicone tube, the remaining pores can continue to work, preventing the foam silicone tube from partially deforming and sticking to the inner wall of the inner tube to block the exhaust holes during vacuuming. This allows the foam silicone tube to expand more fully and evenly, preventing the foam silicone tube from tilting in the inner tube. It can effectively prevent the adhesive coated on the metal shaft core from scratching the inner wall of the foam silicone tube when falling, thereby preventing poor bonding at the bottom of the metal shaft core.

[0007] As an optional embodiment, in the structure for assembling a foamed silicone tube and a metal shaft core provided by the present invention, the sealing plug assembly includes a sealing plug and an inner hole sealing portion, the sealing plug and the inner hole sealing portion are connected by bolts, the sealing plug is sealed and connected to the end of the inner tube, the inner hole sealing portion is tightly connected to the inner wall of the inner tube, and the end of the inner hole sealing portion is provided with a placement hole for fixing the metal shaft core. The sealing plug and the inner hole sealing portion are rotated in conjunction with the bolts to adjust the height so that foamed silicone tubes of different lengths can be used, and inner hole foamed silicone tubes of different specifications can be interchangeable by replacing the inner hole sealing device, thereby meeting the requirements of versatility and interchangeability, reducing costs, and improving efficiency.

[0008] As an optional embodiment, in the structure for assembling a foamed silicone tube and a metal shaft core provided by the present invention, both the sealing plug and the mounting head are provided with sealing rings to enhance the sealing effect.

[0009] As an optional embodiment, in the structure for assembling a foam silicone tube and a metal shaft core provided by the present invention, the end of the inner hole sealing portion has a conical structure. The conical end of the inner hole sealing portion cooperates with the inner hole of the foam silicone tube to reduce air pressure loss and enhance sealing performance.

[0010] As an optional implementation scheme, in the structure for assembling the foam silicone tube and the metal shaft core provided by the present invention, a placement hole is provided at the end of the inner hole sealing part, and a placement hole is provided at the upper end to leave enough space for the metal shaft core to fall, so as to ensure that the bonding position of the foam silicone tube and the metal shaft core is not affected.

[0011] As an optional embodiment, in the structure for assembling a foamed silicone tube and a metal shaft core provided by the present invention, the mounting head is provided with an end cap, the outer diameter of the end cap being larger than the outer diameter of the outer barrel. The provision of the end cap facilitates the removal and disassembly of the mounting head, thereby facilitating operation.

[0012] As an optional embodiment, in the structure for assembling the foamed silicone tube and the metal shaft core provided by the present invention, the mounting head is provided with a tapered hole, which facilitates cleaning of residual glue.

[0013] As an optional implementation scheme, in the structure for assembling a foamed silicone tube and a metal shaft core provided by the present invention, a plurality of air holes are evenly arranged on the inner tube along the axial direction of the inner tube; by setting a suction hole and a plurality of evenly arranged air holes, the suction hole is used in conjunction with the air compressor suction cup to evenly suck away the air between the foamed silicone tube and the tube wall, so that the foamed silicone tube expands evenly, preventing the foamed silicone tube from tilting in the inner tube, and effectively preventing the adhesive coated on the metal shaft core from scratching the inner wall of the foamed silicone tube when falling.

[0014] As an optional implementation scheme, in the structure for assembling a foamed silicone tube and a metal shaft core provided by the present invention, a cavity for placing the metal shaft core is provided in the foamed silicone tube.

[0015] Compared with the prior art, the beneficial effects of the technical solution of the present invention are as follows: the structure for assembling the foamed silicone tube and the metal shaft core provided by the present invention has the advantages of sufficient and uniform expansion of the foamed silicone tube, high sealing reliability and easy operation. By arranging the outer tube, the inner tube, the mounting head and the sealing plug assembly, the two ends of the inner tube are sealed with the mounting head and the sealing plug assembly respectively, the inner tube is provided with a accommodating cavity for placing the foamed silicone tube, the mounting head is provided with a mounting portion for mounting the foamed silicone tube, the mounting portion is provided with a through hole for the metal shaft core to pass through, and the outer side of the inner tube is provided with an outer sleeve The outer tube and the inner tube have a gap, the outer tube is provided with a suction hole, and the inner tube is provided with multiple air holes; a double-layer porous structure is adopted, so that the air is evenly sucked out from the suction hole. When some of the air holes are blocked by the deformed foam silicone tube, the remaining air holes can continue to work, preventing the foam silicone tube from being locally deformed and sticking to the inner wall of the inner tube to block the exhaust holes during vacuuming, making the foam silicone tube expand more fully and evenly, and preventing the foam silicone tube from tilting in the inner tube. It can effectively prevent the adhesive coated on the metal shaft core from scratching the inner wall of the foam silicone tube when falling, so as to prevent poor adhesion of the bottom of the metal shaft core. By arranging the mounting head and the sealing plug assembly at both ends of the inner tube respectively, there is no need to manually stick the lower end of the inner tube to the silicone pad to maintain the seal each time, reducing the air pressure loss caused by insufficient sealing and different lengths of the foam silicone tube, so as to improve the production efficiency of the product, improve product quality, make the operation more convenient, and improve the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 It is a structural diagram of the existing assembly structure;

[0018] Figure 2 A schematic diagram of the structure for assembling a foamed silicone tube and a metal shaft core provided by the present invention;

[0019] Figure 3 for Figure 2 Schematic diagram of the position structure of the outer and inner cylinders;

[0020] Figure 4 This is a schematic diagram of the structure of the air holes and suction holes for assembling the foamed silicone tube and the metal shaft core provided by the utility model;

[0021] Figure 5 for Figure 2 Schematic diagram of the structure of the mounting head;

[0022] Figure 6 for Figure 2 Schematic diagram of the structure of the middle sealing plug assembly;

[0023] Figure 7 This is a schematic diagram of the installation structure of the foam silicone tube and the installation head;

[0024] Figure 8 This is a schematic diagram of the assembly of the foamed silicone tube and the metal shaft provided by the present invention;

[0025] Figure 9 This is a schematic assembly diagram from another perspective for assembling the foam silicone tube and the metal shaft core provided by the utility model.

[0026] [Description of Reference Numerals]

[0027] 1. Outer cylinder; 2. Inner cylinder; 3. Mounting head; 31. Mounting part; 32. End cover; 33. Conical hole; 4. Sealing plug assembly; 41. Sealing plug; 42. Inner hole sealing part; 421. Placement hole; 43. Bolt; 5. Gap; 6. Suction hole; 7. Air hole; 8. Accommodation cavity; 9. Foam silicone tube; 10. Metal shaft core; 11. Sealing ring; 12. Sealing silicone pad; 13. Metal cylinder. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention, such as first, second, up, down, left, right, front, back, etc., are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0031] like Figure 1 As shown, the existing assembly structure is divided into three parts: a mounting head 3, a metal cylinder 13 and a sealing silicone pad 12: the outer circle of the lower end of the mounting head 3 is interference fit with the inner hole of the foam silicone tube 9, and can cooperate with the inner hole of the metal cylinder 13 to form a sealing structure, and an air hole 7 is set in the center of the mounting head 3 for the metal shaft core 10 to pass through, and a 2mm air hole 7 is opened in the middle position of the cylinder body to cooperate with the air compressor suction cup; however, the above assembly structure has the following disadvantages: when vacuuming, the outflow of air is concentrated at one point, causing the foam silicone tube 9 to tilt in the metal cylinder 13, and the adhesive coated on the metal shaft core 10 scratches the inner wall of the foam silicone tube 9 when falling, resulting in poor bonding at the bottom. For some foam silicone tubes 9 with lower hardness, they will be locally deformed and stick to the inner wall of the metal cylinder 13 during vacuuming, which will block the exhaust holes and cause poor expansion; the lower end of the foam silicone tube 9 lacks a separate sealing structure. After the air compressor is turned on, some air will flow into the inner hole of the foam silicone tube 9, causing the actual negative pressure in the metal cylinder 13 to drop, affecting the expansion effect.

[0032] In order to solve the above problems existing in the existing assembly structure, the utility model provides a structure for assembling a foamed silicone tube and a metal shaft core, such as Figure 2-Figure 9As shown, in this embodiment, the inner tube 2 is preferably a metal inner tube 2, and the outer tube 1 is preferably an acrylic outer tube 1. The inner tube 2 and the outer tube 1 are matched with a gap 5. After assembly, sealant is applied to the gap 5. It includes: an outer tube 1, an inner tube 2, a mounting head 3 and a sealing plug assembly 4. The two ends of the inner tube 2 are sealed with the mounting head 3 and the sealing plug assembly 4 respectively. The inner tube 2 is provided with a receiving cavity 8 for placing a foamed silicone tube 9. The mounting head 3 is provided with a mounting portion 31 for mounting the foamed silicone tube 9. The mounting portion 31 is provided with a through hole for the metal shaft core 10 to pass through. The outer tube 1 is sleeved on the outside of the inner tube 2. A gap 5 is left between the outer tube 1 and the inner tube 2. The 2mm gap 5 is reserved for air circulation during vacuuming. The outer tube 1 is provided with a suction hole 6, the inner tube 2 is provided with multiple air holes 7, and the inner tube 2 is provided with a receiving cavity 8. The receiving cavity 8 is used to place the foamed silicone tube 9. The double-layer porous structure is adopted so that the air is evenly sucked out from the suction hole 6. When some of the air holes 7 are blocked by the deformed foam silicone tube 9, the remaining air holes 7 can continue to work, preventing the foam silicone tube 9 from partially deforming and sticking to the inner wall of the inner tube 2 to block the exhaust holes during vacuuming, making the foam silicone tube 9 expand more fully and evenly, preventing the foam silicone tube 9 from tilting in the inner tube 2, and effectively preventing the adhesive coated on the metal shaft core 10 from scratching the inner wall of the foam silicone tube 9 when falling, so as to prevent poor adhesion of the bottom of the metal shaft core 10. By arranging the mounting head 3 and the sealing plug assembly 4 at both ends of the inner tube 2 respectively, there is no need to manually stick the lower end of the inner tube 2 to the silicone pad to maintain the seal each time, reducing the air pressure loss caused by insufficient sealing and different lengths of the foam silicone tube 9, thereby improving the production efficiency of the product, improving product quality, making the operation more convenient, and improving the sealing performance.

[0033] like Figure 2 and Figure 6 As shown, in the structure for assembling a foamed silicone tube and a metal shaft core provided by the present invention, the sealing plug assembly 4 includes a sealing plug 41 and an inner hole sealing portion 42. The sealing plug 41 and the inner hole sealing portion 42 are connected by bolts 43. The sealing plug 41 is sealed and connected to the end of the inner tube 2. The inner hole sealing portion 42 is tightly connected to the inner wall of the inner tube 2. The end of the inner hole sealing portion 42 is provided with a placement hole 421 for fixing the metal shaft core 10. The sealing plug 41 and the inner hole sealing portion 42 are rotated in conjunction with the bolt 43 to adjust the height so that foamed silicone tubes 9 of different lengths can be used. In addition, different specifications of inner hole foamed silicone tubes 9 can be interchangeable by replacing the inner hole sealing device, meeting the requirements of versatility and interchangeability, reducing costs and improving efficiency. The sealing plug 41 and the inner hole sealing portion 42 are connected by bolts 43, and the sealing plug 41 and the bolts 43 are fixed and sealed using sealant.

[0034] In the structure for assembling the foamed silicone tube and the metal shaft core provided by the present invention, as Figure 6As shown, both the sealing plug 41 and the mounting head 3 are equipped with a sealing ring 11. The sealing ring 11 enhances the sealing effect. The sealing plug 41 is machined with two sealing grooves, and an O-ring 11 is used to ensure a seal with the metal mesh liner. The outer diameter of the middle portion of the mounting head 3 fits within the gap 5 between the metal inner cylinder 2, and the O-ring 11 is used to ensure airtightness between the two.

[0035] Preferably, in the structure for assembling the foamed silicone tube and the metal shaft provided by the present invention, the end of the inner hole sealing portion 42 is a conical structure. The end of the inner hole sealing portion 42 is a conical structure, which cooperates with the inner hole of the foamed silicone tube 9 to reduce air pressure loss and provide a stronger seal.

[0036] Furthermore, in the structure for assembling the foam silicone tube and the metal shaft core provided by the present invention, a placement hole 421 is provided at the end of the inner hole sealing part 42, and a placement hole 421 is provided at the upper end, leaving enough space for the metal shaft core 10 to fall, so as to ensure that the bonding position of the foam silicone tube 9 and the metal shaft core 10 is not affected.

[0037] In addition, if Figure 2 and Figure 5 As shown, in the structure for assembling a foamed silicone tube and a metal shaft core provided by the present invention, an end cap 32 is provided on the mounting head 3. The outer diameter of the end cap 32 is larger than the outer diameter of the outer tube 1. The provision of the end cap 32 facilitates the removal and disassembly of the mounting head 3, thus facilitating operation. The central axis of the mounting head 3 has an interference fit with the inner bore of the foamed silicone tube 9. The diameter of the end cap 32 is larger than the outer diameter of the outer tube 1, facilitating removal during production. The inner diameter of the through hole of the mounting head is 1.5 mm larger than the outer diameter of the metal shaft core 10 to facilitate passage of the metal shaft core 10.

[0038] Furthermore, in the structure for assembling the foamed silicone tube and the metal shaft core provided by the present invention, a tapered hole 33 is provided on the mounting head 3. The tapered hole 33 is provided to facilitate cleaning of residual glue.

[0039] like Figure 3 and Figure 4 As shown, in the structure for assembling a foamed silicone tube and a metal shaft core provided by the present invention, a plurality of air holes 7 are evenly arranged along the axial direction of the inner tube 2 on the inner tube 2; by providing a suction hole 6 and a plurality of evenly arranged air holes 7, the suction hole 6 is used in conjunction with the air compressor suction cup to evenly suck out the air between the foamed silicone tube 9 and the tube wall, so that the foamed silicone tube 9 expands evenly, preventing the foamed silicone tube 9 from tilting within the inner tube 2, and effectively preventing the adhesive coated on the metal shaft core 10 from scratching the inner wall of the foamed silicone tube 9 when falling. Specifically, forty-two air holes 7 with a diameter of 2 mm are evenly arranged radially and axially on the inner tube 2, and a suction hole 6 is arranged in the middle of the outer tube 1, and the suction hole 6 and the air hole 7 have the same diameter.

[0040] The steps of using the structure for assembling the foamed silicone tube and the metal shaft core provided by the utility model are as follows: first assemble the foamed silicone tube 9 and the mounting head 3, such as Figure 7 As shown; Assemble the sealing plug 41 and the inner hole sealing part 42, and adjust it to the appropriate height by rotating the inner hole sealing part 42. After the assembly and adjustment are completed, there is no need to disassemble and adjust it if processing the same product; dock the assembled foam silicone tube 9 with the mounting head 3 and the inner cylinder 2; adsorb the air compressor suction cup on the suction hole 6 of the barrel of the outer cylinder 1, and evacuate the air to form a negative pressure state between the foam silicone tube 9 and the metal inner cylinder 2. At this time, the foam silicone tube 9 begins to expand and deform until the outer wall of the foam silicone tube 9 is completely fitted with the inner wall of the metal inner cylinder 2; finally, vertically place the metal shaft core 10 with the adhesive coated on the surface into the tapered hole 33 of the mounting head 3, and let it fall naturally to assemble with the foam silicone tube 9, as shown Figure 8 and Figure 9 shown.

[0041] It should be understood that the above description of the specific embodiments of the present invention is merely for the purpose of illustrating the technical approach and features of the present invention. Its purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. However, the present invention is not limited to the above-described specific embodiments. Any changes or modifications made within the scope of the claims of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A structure for assembling a foamed silicone tube and a metal shaft core, characterized in that: The invention comprises an outer cylinder (1), an inner cylinder (2), a mounting head (3) and a sealing plug assembly (4); the two ends of the inner cylinder (2) are respectively sealedly connected to the mounting head (3) and the sealing plug assembly (4); the inner cylinder (2) is provided with a receiving cavity (8) for placing a foamed silicone tube (9); the mounting head (3) is provided with a mounting portion (31) for mounting the foamed silicone tube (9); the mounting portion (31) is provided with a through hole for a metal shaft core (10) to pass through; the outer side of the inner cylinder (2) is sleeved with the outer cylinder (1); a gap (5) is left between the outer cylinder (1) and the inner cylinder (2); the outer cylinder (1) is provided with a suction hole (6); and the inner cylinder (2) is provided with a plurality of air holes (7).

2. The structure for assembling a foamed silicone tube and a metal shaft core according to claim 1, characterized in that: The sealing plug assembly (4) includes a sealing plug (41) and an inner hole sealing portion (42), wherein the sealing plug (41) and the inner hole sealing portion (42) are connected via bolts (43), the sealing plug (41) is sealedly connected to the end of the inner tube (2), and the inner hole sealing portion (42) is tightly connected to the inner wall of the inner tube (2).

3. The structure for assembling a foamed silicone tube and a metal shaft core according to claim 2, characterized in that: The sealing plug (41) and the mounting head (3) are both provided with sealing rings (11).

4. The structure for assembling a foamed silicone tube and a metal shaft core according to claim 2, characterized in that: The end of the inner hole sealing portion (42) is in a conical structure.

5. The structure for assembling a foamed silicone tube and a metal shaft core according to claim 2, characterized in that: A placement hole (421) is provided at the end of the inner hole sealing portion (42).

6. The structure for assembling a foamed silicone tube and a metal shaft core according to claim 1, characterized in that: An end cover (32) is provided on the mounting head (3), and the outer diameter of the end cover (32) is larger than the outer diameter of the outer cylinder (1).

7. The structure for assembling a foamed silicone tube and a metal shaft core according to claim 1, characterized in that: The mounting head (3) is provided with a tapered hole (33).

8. The structure for assembling a foamed silicone tube and a metal shaft core according to claim 1, characterized in that: A plurality of air holes (7) are evenly distributed on the inner cylinder (2) along the axial direction of the inner cylinder (2).

9. The structure for assembling a foamed silicone tube and a metal shaft core according to claim 1, characterized in that: A cavity for placing a metal shaft core (10) is provided in the foamed silicone tube (9).

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