Anti-blocking cooling roller

Abstract

The utility model discloses a kind of anti-blocking cooling roller, belong to the technical field of plastic extrusion equipment. Including roller body and the shaft head flange being arranged at the both ends of roller body, reciprocating screw flow passage is equipped in roller body, cooling medium is realized in the shaft head single side in and out through the inner tube and connecting sleeve of double-pass rotary joint, cleaning hole, which is communicated with internal screw flow passage, is opened on the shaft head flange of the both ends of roller body, and is equipped with detachable sealing plug, it is convenient to periodically, thoroughly clean flow passage, effectively prevent blockage, prolong service life, reduce maintenance cost. The utility model is simple in structure, economical and practical, especially suitable for the production of plastic sheet material with high temperature difference precision requirement.

Description

Technical Field

[0001] This application belongs to the technical field of plastic sheet extrusion molding equipment, specifically relating to an anti-clogging cooling roller. Background Technology

[0002] In the extrusion production of plastic sheets, plates, and films, rollers are critical forming and cooling components. The uniformity and stability of their surface temperature directly affect the quality of the final product. Currently, most widely used rollers adopt a closed welded structure, making it impossible to effectively inspect and clean the internal flow channels after manufacturing.

[0003] After prolonged operation, impurities and scale in the cooling water can easily accumulate in the flow channels, leading to blockage. This not only severely reduces the cooling efficiency of the rollers but also causes uneven roller surface temperatures, resulting in temperature differences of ±2℃ or even greater, affecting the uniformity of product thickness and appearance quality. Once a blockage occurs, repair is extremely difficult, usually requiring return to the factory for destructive methods such as drilling. This results in long repair cycles, high costs, and may even render the entire roller unusable.

[0004] Therefore, existing technologies suffer from problems such as easy clogging of the internal flow channels of the rollers, difficulty in cleaning and maintenance, large temperature differences on the roller surface, and high maintenance costs. Summary of the Invention

[0005] To address the problems mentioned in the background art, this utility model provides an anti-clogging cooling roller, which aims to achieve highly uniform roller surface temperature, facilitate cleaning of internal flow channels, prevent clogging, and reduce equipment manufacturing and maintenance costs.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] A clog-resistant cooling roller includes a roller body and shaft flanges disposed at both ends of the roller body. At least one shaft flange is connected to a double-through rotary joint. The roller body includes a roller body and an inner liner. The roller body has a plurality of spirally extending first spiral grooves and second spiral grooves circumferentially. The plurality of first spiral grooves and second spiral grooves are arranged at intervals, and the starting ends of the first spiral grooves and second spiral grooves are connected to a water inlet channel or a water outlet channel. The end of each first spiral groove is connected to the end of an adjacent second spiral groove. A plurality of cleaning holes are provided on the outer end face of each shaft flange. Each cleaning hole is connected to the end of each first spiral groove or each second spiral groove. A removable sealing plug is installed in each cleaning hole.

[0008] In one feasible embodiment, a connecting sleeve is installed at the center of the shaft head flange. The connecting sleeve has multiple first transition holes and multiple second transition holes, which are arranged at intervals along the circumference. The shaft head flange has multiple radially extending water inlets and water outlets, which are arranged at intervals along the circumference. Each of the first transition holes is connected to each of the water inlets, and each of the second transition holes is connected to each of the water outlets.

[0009] In one feasible embodiment, the connecting sleeve includes a main body and a cover plate. The main body has a central hole and a water storage tank connected to the central hole. The cover plate is welded to the end face of one side of the water storage tank. Each of the first transition holes communicates with the water storage tank, and each of the second transition holes communicates with the inner wall of the central hole.

[0010] In one feasible embodiment, the double-pass rotary joint has an inner tube and an outer tube sleeved on the outside of the inner tube. The end of the inner tube is inserted into the central hole of the connecting sleeve. The outer wall of the inner tube is watertight with the inner wall of the central hole. The water inlet channel passes through the inner tube, the water storage tank, the first transition hole, and the water inlet hole to enter the first spiral groove or the second spiral groove. The water outlet channel passes through the second spiral groove or the first spiral groove, the water outlet hole, and the second transition hole to enter the interlayer between the inner tube, the central hole, and the outer tube.

[0011] In one feasible embodiment, the central hole of the connecting sleeve includes a small hole near the water storage tank and a large hole away from the water storage tank. The inner diameter of the small hole is smaller than the inner diameter of the large hole. The outer wall of the end of the inner tube is watertight with the inner wall of the small hole. The outer wall of the inner tube and the inner wall of the large hole form part of the water outlet channel.

[0012] In one feasible embodiment, the sealing plug is a threaded plug or a flange blind plate.

[0013] This application applies to cooling rollers with a reciprocating spiral flow channel design. Cooling rollers with a reciprocating spiral flow channel have a long and uniform cooling medium flow path within the roller body, resulting in a small circumferential temperature difference (less than ±1℃) and high product quality. However, due to the long flow path, impurities and flocculents in the water easily accumulate. Therefore, this application addresses this by opening cleaning holes on the shaft flange, allowing for convenient and regular maintenance and cleaning of the internal flow channel, effectively preventing and resolving blockage problems, and extending the service life of the roller.

[0014] This application has the advantages of being easy to maintain, having low maintenance costs, and having a simple and reliable structure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the circulating flow of the cooling medium inside the cooling roller of this utility model.

[0016] Figure 2 This is a schematic cross-sectional view of the cooling roller of this utility model.

[0017] Figure 3 This is a cross-sectional schematic diagram of the shaft head flange of this utility model.

[0018] Figure 4 yes Figure 3 Cross-sectional view along the middle AA.

[0019] Figure 5 This is a cross-sectional schematic diagram of the connecting sleeve of this utility model.

[0020] Figure 6 yes Figure 5 Cross-sectional view of the middle BB.

[0021] Figure 7 This is a schematic diagram of the connection between the shaft head flange and the connecting sleeve.

[0022] Figure 8 A schematic diagram of the internal spiral flow channel of the cooling roller of this utility model.

[0023] The components are as follows: 1. Roller body; 11. Roller body; 12. Inner liner; 13. First spiral groove; 14. Second spiral groove; 2. Shaft head flange; 21. Water inlet hole; 22. Water outlet hole; 23. Cleaning hole; 24. Sealing plug; 3. Double-pass rotary joint; 31. Inner tube; 32. Outer tube; 33. Water inlet channel; 34. Water outlet channel; 4. Inner flange; 5. Connecting sleeve; 50. Main body; 51. First transition hole; 52. Second transition hole; 53. Center hole; 54. Water storage tank; 55. Cover plate. Specific Implementation

[0024] To explain in detail the technical content, structural features, achieved objectives, and effects of the utility model, the technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. In the following description, for illustrative purposes, numerous specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the utility model. However, various exemplary embodiments may also be implemented independently without these specific details or in one or more equivalent arrangements. Furthermore, the various exemplary embodiments may differ, but are not necessarily exclusive. For example, the specific shape, construction, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0025] The anti-clogging cooling roller provided by this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0026] like Figures 1 to 8 As shown, this embodiment provides an anti-clogging cooling roller. The anti-clogging cooling roller mainly includes a roller body 1, shaft flanges 2 disposed at both ends of the roller body 1, a double-pass rotary joint 3, and an inner flange 4.

[0027] In this embodiment, the double-through rotary joint 3 is connected only to the shaft end flange 2 on one side of the roller body 1, while the shaft end flange 2 on the other side is connected to a solid shaft for supporting and rotating the cooling roller. The double-through rotary joint 3 is used to connect the externally fixed cooling medium pipeline to the rotating cooling roller.

[0028] Specifically, the roller body 1 includes an outer roller body 11 and an inner liner 12. Multiple spirally extending channels are formed along the circumference of the inner wall of the roller body 11. These channels include several first spiral channels 13 and several second spiral channels 14, which are spaced apart from each other and isolated from one another. Preferably, the first spiral channels 13 and the second spiral channels 14 have the same spiral direction, pitch, and spiral angle, but are staggered circumferentially. More preferably, the first spiral channels 13 and the second spiral channels 14 are evenly distributed circumferentially. The end of each first spiral channel 13 communicates with the end of an adjacent second spiral channel 14, thereby connecting the first spiral channels 13 and the second spiral channels 14 in series to form a continuous reciprocating spiral flow channel with a zigzag path on the inner wall of the roller body.

[0029] To prevent deformation and denting of the roller surface, one or more inner flanges 4 are provided inside the roller body 11.

[0030] See Figure 2 A connecting sleeve 5 is installed at the center of the left-side shaft flange 2. The core function of this connecting sleeve 5 is to separate and guide the flow of the cooling medium, achieving separation and transition between the inlet and outlet water channels. The connecting sleeve 5 includes a main body 50 and a cover plate 55. See also Figure 5 , 6 The main body 50 has a central hole 53 and a water storage tank 54 connected to the central hole 53. The cover plate 55 is welded to the end face of one side of the water storage tank 54 to seal it.

[0031] See also Figure 5 , 67. On the main body 50, a plurality of first transition holes 51 and a plurality of second transition holes 52 are spaced apart along its circumference. Preferably, the plurality of first transition holes 51 and the plurality of second transition holes 52 are evenly distributed along the circumference. Each first transition hole 51 communicates with the water storage tank 54, while each second transition hole 52 communicates with the inner wall of the central hole 53.

[0032] See Figure 3 , 4 The shaft head flange 2 has a plurality of radially extending water inlet holes 21 and water outlet holes 22, which are also arranged circumferentially at intervals, preferably evenly distributed. After the connecting sleeve 5 is installed inside the shaft head flange 2, each of its first transition holes 51 is aligned with and communicates with a water inlet hole 21, and each of its second transition holes 52 is aligned with and communicates with a water outlet hole 22.

[0033] The double-through rotary joint 3 has an inner tube 31 and an outer tube 32 sleeved on the outside of the inner tube 31. The inner tube 4 is arranged along the axis of the roller body 1, and the end of the inner tube 31 is inserted into and fixed in the central hole 53 of the connecting sleeve 5. In order to achieve water channel separation, the central hole 53 is designed to include two sections: a small hole on the side closer to the water storage tank 54 and a large hole on the side farther away from the water storage tank 54, with the inner diameter of the small hole being smaller than that of the large hole. The outer wall of the right end of the inner tube 31 is sealed to the inner wall of the small hole by a sealing element (such as an O-ring). An annular gap is maintained between the outer wall of the inner tube 31 and the inner wall of the large hole.

[0034] Thus, the flow channels for the cooling medium are established:

[0035] Water inlet channel 33: Cooling medium (such as water) flows in from the inner tube 31 of the double-pass rotary joint 3, enters the water storage tank 54 of the connecting sleeve 5, and then is diverted to multiple water inlet holes 21 through multiple first transition holes 51, and finally enters the starting end of the first spiral groove 13 (or the second spiral groove 14, depending on the specific design) on the roller body 11.

[0036] Water outlet channel 34: After the cooling medium flows in the first spiral groove 13 and the second spiral groove 14 connected in series and exchanges heat with the roller body, it flows out from the end of the last spiral groove, enters the corresponding water outlet hole 22, and then flows through the second transition hole 52 to enter the interlayer space formed by the outer wall of the inner tube 31, the central hole 53 (large hole section) and the inner wall of the outer tube 32, and finally flows out from the outlet between the outer tube and the inner tube of the double-through rotary joint 3.

[0037] Furthermore, multiple cleaning holes 23 are provided on the outer end face of each of the shaft head flanges 2, and these cleaning holes are evenly distributed along the circumference. These cleaning holes 23 are directly connected to the ends of each first spiral groove 13 or each second spiral groove 14 located at the shaft head end. Each cleaning hole 23 is equipped with a removable sealing plug 24, such as a threaded plug or a flange blind plate. After the cooling roller has been used for a period of time, impurities may accumulate in the flow channel, causing blockage. At this time, the machine can be stopped and the sealing plug 24 can be removed. A high-pressure water pipe or compressed air can be connected to directly flush the ends of the corresponding spiral grooves through the cleaning holes 23 for cleaning operations. After unblocking, the sealing plug 24 can be reinstalled. Maintenance is very convenient and effectively solves the problem of difficulty in cleaning traditional closed cooling rollers after blockage.

[0038] See Figure 2 , 8 As shown, cleaning holes 23 are provided on both shaft head flanges 2. During flushing, water enters through the cleaning hole 23 on the left shaft head flange 2 and exits through the cleaning hole 23 on the right shaft head flange 2, so that high-pressure water or high-pressure gas can pass through the spiral groove as quickly as possible and carry away impurities and blockages.

[0039] The anti-clogging cooling roller in this embodiment achieves stable separation and distribution of water inlet and outlet during rotation through the connecting sleeve. The cooling path is extended by the series of spiral grooves, which improves the heat exchange efficiency. In particular, the design of the openable cleaning hole on the shaft flange enables convenient cleaning of the flow channel, which significantly improves the anti-clogging performance and long-term operational reliability of the equipment.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A clog-resistant cooling roller, comprising a roller body (1) and shaft flanges (2) disposed at both ends of the roller body, characterized in that: At least one shaft head flange (2) is connected to a double-pass rotary joint (3). The roller body (1) includes a roller body (11) and an inner liner (12). The roller body (11) is provided with a plurality of spirally extending first spiral grooves (13) and second spiral grooves (14) along the circumference. The plurality of first spiral grooves (13) and second spiral grooves (14) are arranged at intervals, and the starting ends of the first spiral grooves (13) and second spiral grooves (14) are connected to the inlet channel (33) or the outlet channel (34). The end of each first spiral groove (13) is connected to the end of an adjacent second spiral groove (14). A plurality of cleaning holes (23) are provided on the outer end face of each shaft head flange (2). Each cleaning hole (23) is connected to the end of each first spiral groove (13) or each second spiral groove (14). Each cleaning hole (23) is fitted with a removable sealing plug (24).

2. The anti-clogging cooling roller according to claim 1, characterized in that, A connecting sleeve (5) is installed at the center of the shaft head flange (2). The connecting sleeve (5) has multiple first transition holes (51) and multiple second transition holes (52). The multiple first transition holes (51) and multiple second transition holes (52) are arranged circumferentially. The shaft head flange (2) has multiple radially extending water inlet holes (21) and water outlet holes (22). The water inlet holes (21) and water outlet holes (22) are arranged circumferentially. Each of the first transition holes (51) is connected to each of the water inlet holes (21), and each of the second transition holes (52) is connected to each of the water outlet holes (22).

3. The anti-clogging cooling roller according to claim 2, characterized in that, The connecting sleeve (5) includes a main body (50) and a cover plate (55). The main body (50) has a central hole (53) and a water storage tank (54) connected to the central hole (53). The cover plate (55) is welded to the end face of one side of the water storage tank (54). Each of the first transition holes (51) is connected to the water storage tank (54), and each of the second transition holes (52) is connected to the inner wall of the central hole (53).

4. The anti-clogging cooling roller according to claim 3, characterized in that, The double-through rotary joint (3) has an inner tube (31) and an outer tube (32) sleeved on the outside of the inner tube (31). The end of the inner tube (31) is inserted into the center hole (53) of the connecting sleeve (5). The outer wall of the inner tube (31) is water-sealed with the inner wall of the center hole (53). The water inlet channel (33) passes through the inner tube (31), the water storage tank (54), the first transition hole (51), and the water inlet hole (21) into the first spiral groove (13) or the second spiral groove (14). The water outlet channel (34) passes through the second spiral groove (14) or the first spiral groove (13), the water outlet hole (22), and the second transition hole (52) into the interlayer between the inner tube (31), the center hole (53), and the outer tube (32).

5. The anti-clogging cooling roller according to claim 4, characterized in that, The central hole (53) of the connecting sleeve (5) includes a small hole near the water tank and a large hole away from the water tank. The inner diameter of the small hole is smaller than the inner diameter of the large hole. The outer wall of the end of the inner tube (31) is watertight with the inner wall of the small hole. The outer wall of the inner tube (31) and the inner wall of the large hole form part of the water outlet channel (34).

6. The anti-clogging cooling roller according to claim 1, characterized in that: The sealing plug (24) is a threaded plug or a flange blind plate.

Images