A mirror-finish cooling roller for plastic sheets

Abstract

This utility model discloses a mirror cooling roller for plastic sheets, belonging to the technical field of plastic sheet processing equipment. It includes a roller body, a mirror sleeve fitted around the outer periphery of the roller body, a shaft head fixed to the end of the roller body, a disassembly / assembly assembly, and a sealing assembly. The disassembly / assembly assembly includes a fixed housing, a screw, a handle, an extrusion block, ball bearings, a sleeve cover, and a fixing ring. Rotating the handle drives the screw, which pushes the extrusion block. The extrusion block selectively pushes the ball bearings within the radial holes of the fixed housing, locking them into the sleeve cover covering the outside of the fixed housing. The fixing ring cooperates with the sleeve cover to axially position the mirror sleeve. This utility model, by setting up the disassembly / assembly assembly, solves the problems of complex, time-consuming, and labor-intensive disassembly / assembly of the mirror sleeve in the prior art, achieving a fast and convenient disassembly / assembly effect, shortening downtime. Simultaneously, the sealing assembly ensures the sealing performance of the coolant at the rotating joint, preventing leakage.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic sheet processing equipment, and in particular to a mirror cooling roller for plastic sheets. Background Technology

[0002] In plastic sheet extrusion or calendering production lines, mirror cooling rollers are one of the key components. After the high-temperature molten plastic is extruded from the die, it needs to adhere to the outer surface of the mirror cooling roller, where it is rapidly cooled and shaped by a circulating cooling medium inside the roller. The surface finish of the mirror cooling roller (i.e., the "mirror" effect) directly determines the surface quality of the final plastic sheet.

[0003] During long-term production, the outer surface of the mirror sleeve of the mirror cooling roller will inevitably be damaged due to friction, scratches, or impurities in the material, resulting in defects in the sheet products. In this case, the mirror sleeve needs to be replaced in time. In addition, in order to adapt to the production needs of different products, such as producing high-gloss, matte, or sheets with specific textures, it is also necessary to frequently replace the mirror sleeve with different surface properties.

[0004] However, in existing mirror cooling rollers, the mirror sleeve and roller body are typically connected using flange bolts, interference fits, or large threads. While this method is robust, disassembling and replacing the mirror sleeve is extremely cumbersome, often requiring multiple specialized tools and consuming significant time for disassembly, assembly, and alignment, resulting in excessive production line downtime. This inefficient disassembly and assembly method severely impacts production efficiency and equipment flexibility, while increasing maintenance costs.

[0005] Therefore, this utility model proposes a mirror cooling roller for plastic sheets to overcome the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a mirror cooling roller for plastic sheets, aiming to improve the problems of complex mirror sleeve disassembly and assembly structure, cumbersome operation process, time and labor consumption, and low production and maintenance efficiency in the existing mirror cooling roller for plastic sheets.

[0007] To achieve the above objectives, this utility model provides a mirror cooling roller for plastic sheets, comprising: a roller body, a mirror sleeve, and a shaft head, wherein the mirror sleeve is fitted around the outer periphery of the roller body, and the shaft head is fixedly connected to the end of the roller body.

[0008] It also includes disassembly and assembly components and sealing components.

[0009] The assembly / disassembly assembly includes a fixed housing fixed to one end of the roller body, and a screw is threaded into the fixed housing.

[0010] Furthermore, a handle is connected to the outer end of the screw, and the inner end of the screw pushes the extrusion block, which is axially slidably disposed within the fixed housing. A ball bearing is disposed within the radial hole of the fixed housing, and the extrusion block is used to selectively push the ball bearing to move radially outward.

[0011] The assembly and disassembly components also include a cover and a retaining ring. The cover is fitted over the outside of the fixed housing and locked in place by ball bearings. The retaining ring is located at the other end of the mirror sleeve and engages with the cover to axially position the mirror sleeve.

[0012] Preferably, it further includes a rotary joint that is rotatably inserted into the shaft head, and the sealing assembly is disposed between the rotary joint and the shaft head.

[0013] Preferably, the sealing assembly includes a bushing, a compression ring, a spring, and a sealing ring. The bushing is fixed inside the shaft head, and the spring and the compression ring are housed within the bushing. The spring pushes the compression ring, and the compression ring pushes the sealing ring, so that the sealing ring fits tightly against the inner wall of the rotary joint.

[0014] Preferably, the sealing assembly further includes an O-ring and a butterfly ring, wherein the O-ring is disposed between the outer periphery of the rotary joint and the inner wall of the shaft head, and the butterfly ring is disposed on one side of the O-ring.

[0015] Preferably, the extrusion block has a tapered end face, which is used to push the ball outward along the radial hole.

[0016] Preferably, the inner wall of the cover is provided with an annular groove, and the ball is driven into the annular groove by the pressing block to lock the cover.

[0017] Preferably, when the extrusion block retracts axially, the ball bearing can retract into the fixed housing under the pressure of the sleeve sidewall to release the sleeve.

[0018] Preferably, the shaft head has a channel for coolant circulation, and the rotary joint is connected to the channel.

[0019] This utility model has the following beneficial effects: 1. In this utility model, a disassembly and assembly assembly consisting of a handle, screw, extrusion block, ball bearing, and cover is ingeniously designed. By rotating the handle, the screw can be driven, which in turn controls the extrusion block to push the ball bearing to lock or release the cover. This solves the problems of complex disassembly and assembly of mirror covers in the prior art, which rely on tools and are time-consuming and labor-intensive. It achieves the effect of quick, convenient, and labor-saving disassembly and assembly of mirror covers, and greatly shortens the downtime for equipment maintenance and specification changes.

[0020] 2. This utility model, by setting up a sealing component, utilizes the axial dynamic seal formed by the spring pushing the sealing ring, combined with the radial static seal formed by the O-ring and the butterfly ring, to form a multi-combination sealing structure. This effectively solves the problem of coolant leakage from the connection point when the rotary joint and the shaft rotate at high speed relative to each other, ensuring the stable operation of the cooling system and the cleanliness of the working environment. Attached Figure Description

[0021] Figure 1 This is a perspective view of a mirror cooling roller for plastic sheets proposed in this utility model. Figure 2 This is a schematic diagram showing the separation of the mirror sleeve and the roller body of a mirror cooling roller for plastic sheets according to the present invention. Figure 3 This is a schematic diagram of the disassembly and assembly components of a mirror cooling roller for plastic sheets according to the present invention. Figure 4 This is a schematic diagram of a rotary joint for a mirror cooling roller used in plastic sheets, as proposed in this utility model. Figure 5 This is a schematic diagram of a sealing assembly for a mirror cooling roller used in plastic sheets, as proposed in this utility model.

[0022] Legend: 1. Roller body; 2. Shaft head; 3. Rotary joint; 4. Mirror sleeve; 5. Assembly / disassembly assembly; 501. Cover; 502. Retaining ring; 503. Retaining shell; 504. Ball bearing; 505. Screw; 506. Handle; 507. Extrusion block; 6. Sealing assembly; 601. Butterfly ring; 602. O-ring seal; 603. Bushing; 604. Extrusion ring; 605. Spring; 606. Sealing ring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Reference Figures 1-5 This utility model provides a mirror cooling roller for plastic sheets, aiming to solve the problem that the mirror sleeve of the existing mirror cooling roller is complicated to disassemble and assemble, which is time-consuming and leads to low production and maintenance efficiency.

[0025] Specifically, it includes a roller body 1, which serves as the main structure of the cooling roller and is used for bearing and heat transfer. A mirror sleeve 4 is fitted around the outer periphery of the roller body 1. The outer surface of the mirror sleeve 4 is used to directly contact the plastic sheet for cooling and shaping. A shaft head 2 is fixedly connected to the end of the roller body 1. The shaft head 2 is used to support the rotation of the roller body 1 and provide an inlet and outlet interface for the coolant.

[0026] It also includes a disassembly and assembly component 5 and a sealing component 6. The disassembly and assembly component 5 is used to enable quick assembly and disassembly of the mirror sleeve 4 and the roller body 1, and the sealing component 6 is used to ensure the sealing of the coolant flow path.

[0027] The disassembly assembly 5 includes a fixed housing 503, which is fixed to one end of the roller body 1, for example, by bolts or welding, providing an installation reference for other parts of the disassembly assembly 5. A screw 505 is internally threaded onto the fixed housing 503, and the thread of the screw 505 engages with the internal thread of the fixed housing 503, allowing the screw 505 to feed or retract axially when rotated. A handle 506 is connected to the outer end of the screw 505, allowing the operator to drive the assembly by rotating the handle 506. The rotating screw 505 pushes the extrusion block 507 with its inner end. The extrusion block 507 is axially slidable within the fixed housing 503, and its rear end face abuts against the inner end of the screw 505. When the screw 505 is screwed in, the extrusion block 507 is pushed and moves axially along the inner cavity of the fixed housing 503. A ball bearing 504 is provided in the radial hole of the fixed housing 503, and a through radial hole is provided on the wall of the fixed housing 503. The ball bearing 504 is accommodated in the radial hole and can move radially. The pressing block 507 is used to selectively push the ball 504 to move radially outward. When the pressing block 507 is axially advanced to a specific position, the outer peripheral surface of the pressing block 507 will press the ball 504, forcing the ball 504 to protrude outward along the radial hole. The disassembly and assembly assembly 5 also includes a cover 501, which covers the outside of the fixed housing 503. The inner cavity size of the cover 501 matches the outer diameter of the fixed housing 503. The cover 501 is locked by the ball 504. When the ball 504 is pressed... When block 507 is pushed outward, ball 504 will be engaged in the inner wall structure of cover 501, thereby preventing cover 501 from axially dislodging and locking. The disassembly and assembly assembly 5 also includes a retaining ring 502, which is disposed at the other end of the mirror sleeve 4. The retaining ring 502 cooperates with cover 501 to achieve axial positioning of the mirror sleeve 4. Specifically, the mirror sleeve 4 is clamped between the inner end face of cover 501 and retaining ring 502 to prevent the mirror sleeve 4 from axially moving on roller 1.

[0028] To facilitate the introduction and export of coolant, a rotary joint 3 is included. The rotary joint 3 is rotatably inserted into the shaft head 2, with its insertion end extending into the cavity of the shaft head 2. The external connection end of the rotary joint 3 is connected to an external stationary coolant pipeline. The rotating part of the rotary joint 3 rotates synchronously with or relative to the shaft head 2, while the stationary part remains stationary, thus forming a hub for dynamic and static sealing. A sealing assembly 6 is disposed between the rotary joint 3 and the shaft head 2, surrounding the mating gap between the rotary joint 3 and the shaft head 2 to prevent coolant leakage between the dynamic and stationary parts. Furthermore, a channel for coolant circulation is provided inside the shaft head 2. This channel may include a coaxial central inlet channel and an annular outer peripheral return channel, or conversely, the coolant flows into the roller body 1 through this channel for heat exchange and then flows out through the channel. The rotary joint 3 is connected to this channel, and the internal flow channel of the rotary joint 3 is precisely aligned with the channel inside the shaft head 2 to ensure that the coolant can circulate smoothly between the external pipeline and the rotating roller body 1.

[0029] The sealing assembly 6 includes a bushing 603, a compression ring 604, a spring 605, and a sealing ring 606. The bushing 603 is fixed inside the shaft head 2 and can be installed on the inner step of the shaft head 2 via a threaded connection or interference fit, providing positioning and support for the internal parts of the sealing assembly 6. The spring 605 and the compression ring 604 are housed within the bushing 603. The spring 605 is preferably a cylindrical helical spring, with one end abutting against the bottom or step surface of the bushing 603 and the other end abutting against the back of the compression ring 604. The spring 605 pushes the compression ring 604, and the spring 605 is in a pre-compressed state, continuously compressing the compression ring. The pressure ring 604 applies axial thrust, and the compression ring 604 pushes the sealing ring 606. The sealing ring 606 is usually made of wear-resistant materials such as graphite or silicon carbide. The compression ring 604 transmits the elastic force of the spring 605 to the sealing ring 606, so that the sealing ring 606 fits tightly against the inner wall of the rotary joint 3. Here, the inner wall should be understood as the end face on the rotary joint 3 used to form an axial dynamic seal. Under the combined action of the elastic force of the spring 605 and the fluid pressure, the sealing ring 606 keeps in close contact with the corresponding sealing end face of the rotary joint 3, forming a reliable dynamic sealing surface, which can effectively prevent coolant leakage even when the shaft head 2 rotates at high speed.

[0030] The sealing assembly 6 also includes an O-ring 602 and a butterfly ring 601. The O-ring 602 is disposed between the outer periphery of the rotary joint 3 and the inner wall of the shaft head 2. The O-ring 602 is installed in the sealing groove on the outer surface of the insertion end of the rotary joint 3. When the rotary joint 3 is inserted into the shaft head 2, the O-ring 602 is radially compressed, filling the gap between the outer surface of the rotary joint 3 and the inner surface of the shaft head 2, forming a static seal to prevent coolant leakage from the gap. The butterfly ring 601 is disposed on one side of the O-ring 602. The butterfly ring 601 is preferably a metal elastic gasket. The function of the butterfly ring 601 is to provide axial preload for the O-ring 602 or to act as a retainer ring, assisting the O-ring 602 in better positioning and compression, and working together with the O-ring 602 to further enhance the reliability of the static seal, ensuring that coolant does not leak before entering the dynamic sealing area.

[0031] The extrusion block 507 has a tapered end face. The end of the extrusion block 507 facing the ball 504 is machined into a frustum shape. The outer diameter of the tapered end face gradually increases. The tapered end face is used to push the ball 504 outward along the radial hole. When the extrusion block 507 moves axially under the push of the screw 505, the large diameter part of the tapered end face will gradually wedge into the inner side of the ball 504. By utilizing the principle of inclined plane force component, the axial thrust is converted into a strong radial thrust, forcing the ball 504 to protrude outward, thereby achieving a labor-saving and reliable locking.

[0032] The inner wall of the cover 501 is provided with an annular groove. The cross-sectional shape and position of the annular groove match the outward protrusion of the ball 504. The ball 504 is pushed into the annular groove by the pressing block 507 to lock the cover 501. When the ball 504 is pushed outward by the conical end face of the pressing block 507, the exposed part of the ball 504 just enters and is held in the annular groove of the cover 501. Since the groove wall of the annular groove blocks the ball 504, it prevents the axial movement of the cover 501, thus realizing the firm locking of the cover 501 and the fixed shell 503.

[0033] When the pressing block 507 retracts axially, the operator rotates the handle 506 in the opposite direction to unscrew the screw 505, causing the pressing block 507 to move away from the ball 504. At this time, the conical end face of the pressing block 507 disengages from the radial support of the ball 504, and the ball 504 can retract into the fixed shell 503 under the pressure of the side wall of the cover 501. If the cover 501 is pulled axially at this time, the inclined surface or side wall of the annular groove of the cover 501 will generate a radially inward pressing force on the ball 504. Since the pressing block 507 has made room for the internal space, the ball 504 is pressed back into the radial hole of the fixed shell 503 and no longer protrudes to the outer surface of the fixed shell 503. The ball 504 disengages from the annular groove, thereby releasing the cover 501, so that the cover 501 can be easily removed.

[0034] Working principle: The plastic sheet to be cooled is attached to the outer surface of the mirror sleeve 4. The coolant inside the roller body 1 circulates through the channel of the shaft head 2, carrying away the heat transferred from the plastic sheet to the mirror sleeve 4, thereby achieving cooling and shaping of the plastic sheet. At the same time, the disassembly and assembly component 5 is used to realize the quick disassembly and assembly of the mirror sleeve 4 and the roller body 1. The rotary joint 3 realizes the rotary connection between the shaft head 2 and the external pipeline. The sealing component 6 ensures the sealing performance at the connection between the shaft head 2 and the rotary joint 3.

[0035] When it is necessary to disassemble or assemble the mirror sleeve 4, the operator turns the handle 506, which drives the screw 505 to rotate inside the fixed housing 503. The screw 505 pushes the extrusion block 507 to move, causing the extrusion block 507 to separate from the ball 504. At this time, by pulling the sleeve cover 501 outward, the side wall of the sleeve cover 501 is squeezed against the ball 504, and the ball 504 slides into the fixed housing 503. At this time, the sleeve cover 501 can be removed and the mirror sleeve 4 can be pulled out, thereby realizing the separation of the mirror sleeve 4 from the roller body 1. The operation is reversed during installation. The fixing ring 502 is used to axially position the mirror sleeve 4.

[0036] When the shaft head 2 is connected to the rotary joint 3, the spring 605 inside the bushing 603 pushes the compression ring 604, so that the sealing ring 606 fits tightly against the inner wall of the rotary joint 3. At the same time, when the rotary joint 3 enters the shaft head 2, it will compress the O-ring seal 602 and cooperate with the butterfly ring 601 to further enhance the sealing effect and prevent coolant from leaking from the connection between the shaft head 2 and the rotary joint 3. The rotary joint 3 realizes the stable connection between the shaft head 2 and the external pipeline during the rotation process, ensuring the continuous supply of coolant.

Claims

1. A mirror-finish cooling roller for plastic sheets, comprising: Roller body (1); A mirror sleeve (4) is fitted onto the outer periphery of the roller body (1); Shaft head (2), the shaft head (2) is fixedly connected to the end of the roller body (1); The feature is that it further includes a disassembly and assembly component (5) and a sealing component (6); The disassembly and assembly assembly (5) includes a fixed housing (503) fixed to one end of the roller body (1), a screw (505) is threadedly connected to the fixed housing (503), a handle (506) is connected to the outer end of the screw (505), the inner end of the screw (505) pushes the extrusion block (507), the extrusion block (507) is axially slidably disposed in the fixed housing (503), a ball (504) is disposed in the radial hole of the fixed housing (503), and the extrusion block (507) is used to selectively push the ball (504) to move radially outward; The disassembly and assembly assembly (5) also includes a cover (501) and a retaining ring (502). The cover (501) is placed over the outside of the retaining shell (503) and locked by the ball bearing (504). The retaining ring (502) is located at the other end of the mirror sleeve (4). The retaining ring (502) cooperates with the cover (501) to achieve axial positioning of the mirror sleeve (4).

2. The mirror-finish cooling roller for plastic sheets according to claim 1, characterized in that, It also includes a rotary joint (3) which is rotatably inserted into the shaft head (2), and the sealing assembly (6) is disposed between the rotary joint (3) and the shaft head (2).

3. A mirror-finish cooling roller for plastic sheets according to claim 2, characterized in that, The sealing assembly (6) includes a bushing (603), a compression ring (604), a spring (605), and a sealing ring (606). The bushing (603) is fixed inside the shaft head (2). The spring (605) and the compression ring (604) are housed in the bushing (603). The spring (605) pushes the compression ring (604), and the compression ring (604) pushes the sealing ring (606), so that the sealing ring (606) fits tightly against the inner wall of the rotary joint (3).

4. A mirror-finish cooling roller for plastic sheets according to claim 3, characterized in that, The sealing assembly (6) further includes an O-ring (602) and a butterfly ring (601). The O-ring (602) is disposed between the outer periphery of the rotary joint (3) and the inner wall of the shaft head (2), and the butterfly ring (601) is disposed on one side of the O-ring (602).

5. A mirror-finish cooling roller for plastic sheets according to claim 1, characterized in that, The extrusion block (507) has a tapered end face, which is used to push the ball (504) outward along the radial hole.

6. A mirror-finish cooling roller for plastic sheets according to claim 1, characterized in that, The inner wall of the cover (501) is provided with an annular groove, and the ball (504) is pushed into the annular groove by the pressing block (507) to lock the cover (501).

7. A mirror-finish cooling roller for plastic sheets according to claim 6, characterized in that, When the extrusion block (507) retracts axially, the ball (504) can retract into the fixed shell (503) under the extrusion of the side wall of the cover (501) to release the cover (501).

8. A mirror-finish cooling roller for plastic sheets according to claim 2, characterized in that, The shaft head (2) has a channel for coolant circulation, and the rotary joint (3) is connected to the channel.

Images