An energy-saving drying device for stretch film

Abstract

This utility model discloses an energy-saving drying device for stretch film, relating to the field of stretch film drying technology. It includes a chassis and a chiller. A winding mechanism is installed on the inner wall of the chassis, and a sliding groove is formed on the outer surface of the chassis. This utility model, through the cooperation of a slidingly connected limiting ring in a limiting component, a magnetic pull plate, and an arc-shaped magnetic block embedded in the rotating shaft, constitutes a magnetic adaptive adjustable limiting system. This system has the function of quickly adapting to and clamping stretch film rolls of different widths. It solves the problem that traditional fixed baffles or limiting devices with non-adjustable spacing cannot flexibly adapt to film rolls of various lengths. The effective distance between the sliding limiting ring and the support plate can be easily changed to accommodate paper cores of different lengths. Magnetic attraction is used to achieve pre-fixation and rapid release of the pull plate, avoiding the cumbersome operation and low efficiency problems caused by mechanical methods such as threaded locking.

Description

Technical Field

[0001] This utility model relates to the field of stretch film drying technology, specifically to an energy-saving stretch film drying device. Background Technology

[0002] Stretch film is a widely used packaging material in industrial production. It typically requires drying to remove surface solvents or moisture, ensuring stable performance. Energy-efficient stretch film drying equipment, which uses hot air convection and cooling systems for continuous processing of the film, is a key piece of equipment for improving its quality.

[0003] However, existing equipment has some operational problems: First, the limiting components on the equipment's rotating shaft are mostly fixed or have a limited adjustment range, making it difficult to quickly adapt to winding film rolls of different lengths. When changing film roll specifications, it is often necessary to make significant adjustments to the mechanical limiting device, which is cumbersome and inefficient.

[0004] Meanwhile, during the drying process, a large amount of hot air easily escapes from both sides of the membrane material and the equipment openings, not only wasting heat energy but also potentially causing uneven temperature distribution within the chamber, affecting the consistency of the drying effect. Furthermore, the escaping high-temperature airflow may interfere with the stable operation of the subsequent cooling zone, ultimately adversely affecting the quality of the finished membrane.

[0005] In summary, it is necessary to develop an energy-saving drying device for stretch film to solve the above problems. Utility Model Content

[0006] To address the shortcomings of existing technologies, the technical solution adopted by this utility model is: an energy-saving drying device for stretch film, comprising a casing and a chiller, wherein a stretching mechanism is installed on the inner wall of the casing, and a sliding groove is formed on the outer surface of the casing; the stretching mechanism further comprises: The first motor is mounted on the inner wall of the chassis, and a rotating shaft is fixedly connected to the output end of the first motor. A drying component is rotatably connected to the upper surface of a chute, and the drying component is equipped with a fan; A cooling component, which is mounted on the inner wall of the chassis, includes a second motor.

[0007] Furthermore, a support plate is rotatably connected to the outer surface of the rotating shaft, a winding film is sleeved on the outer surface of the rotating shaft, an arc-shaped magnetic block is embedded in the inner wall of the rotating shaft, a limit component is installed on the outer surface of the rotating shaft, and a magnetic frame is provided on the outer side of the end of the rotating shaft away from the first motor, with a support ring installed on the outer surface of the magnetic frame. The magnetic frame is magnetic and attracts each other with the magnetic material pre-embedded in the inner wall of the housing, thereby providing magnetic auxiliary support to one end of the rotating shaft without complex mechanical connections, enhancing the stability of the rotating shaft during operation. At the same time, this connection method facilitates quick disassembly for roll changing operations.

[0008] Furthermore, one end of the support plate is fixed to the outer surface of the chassis, multiple sets of the arc-shaped magnetic blocks are provided, and the inner surface of the support ring is rotatably connected to the outer surface of the rotating shaft.

[0009] Furthermore, the limiting component includes: A limiting ring is included, with a pull plate slidably connected to its inner wall. A compression spring is fixed to the outer surface of the pull plate. The pull plate is made of magnetic material and can be attracted to an arc-shaped magnetic block. Under the action of magnetic attraction, it can achieve rapid pre-positioning or temporary fixation to prevent accidental slippage.

[0010] Furthermore, the inner surface of the limiting ring is slidably connected to the outer surface of the rotating shaft, and the top end of the compression spring is mounted on the inner wall of the limiting ring.

[0011] Furthermore, a duct is fixedly connected to the side of the fan, and a heating chamber is fixedly connected to the end of the duct away from the fan. An electric heating element is fixedly connected to the inner wall of the heating chamber, and a movable cover is installed on the outer surface of the heating chamber. Rollers are rotatably connected to the inner wall of the movable cover, and a heat shield is installed on the lower surface of the movable cover. The power supply for the electric heating element is connected to an external power source and control system via a high-temperature resistant cable passing through the upper surface of the casing. This arrangement ensures the safety and reliability of high-current transmission.

[0012] Furthermore, the fan is installed on the upper surface of the heating chamber tube, and the outer surface of the roller is in rolling connection with the inner surface of the chute.

[0013] Furthermore, a coupling is fixedly connected to the output end of the second motor. A cooling roller is fixedly connected to the end of the coupling away from the output end of the second motor. A rotary joint is fixedly connected to the end of the cooling roller away from the coupling. A fixed water pipe is installed at the end of the rotary joint away from the cooling roller. The fixed water pipe is connected to the outlet of the chiller to supply cooling water. The rotary joint, as a dynamic sealing interface, allows the cooling roller to rotate while seamlessly guiding the cooling water into its internal spiral flow channel and discharging the heated water, forming a closed-loop cooling circuit.

[0014] Furthermore, a third motor is provided on one side of the second motor, and a take-up roller is fixedly connected to the output end of the third motor. A support cylinder is slidably connected to the outer surface of the take-up roller. Similar to a magnetic frame, the support cylinder is made of magnetic material. Its function is to use magnetic force to adhere to a specific position on the inner wall of the machine housing, providing a driven support for the free end of the take-up roller that can be quickly positioned and removed. This design eliminates the need for a traditional slide rail locking mechanism, simplifying operation. When changing rolls, only the magnetic force needs to be overcome to move the support cylinder away and remove the heavy film roll.

[0015] Furthermore, the second motor is provided in multiple sets, intermittently distributed in an S-shape. The outer surface of the rotary joint is rotatably connected to the inner surface of the chassis. The end of the fixed water pipe away from the rotary joint is fixedly connected to the outer surface of the chiller. The outer surface of the third motor is fixedly connected to the inner wall of the chassis. The outer surface of the support cylinder is slidably connected to the inner surface of the chassis. The wrapping film bypasses multiple sets of cooling rollers in an "S"-shaped path, thereby multiplying the contact area and contact time between the film and the cooling rollers, ensuring uniform, efficient, and thorough cooling. The support cylinder is magnetically adsorbed onto a pre-set magnetic base on the inner wall of the chassis. Its "sliding connection" means that it can slide along a pre-set path to the magnetic adsorption position and be fixed, or slide away from that position.

[0016] The beneficial effects of this utility model are as follows: 1. This utility model, through the cooperation of a slidingly connected limiting ring in the limiting component, a magnetic pull plate, and an arc-shaped magnetic block embedded in the rotating shaft, constitutes a magnetic adaptive adjustable limiting system, which has the function of quickly adapting to and clamping film rolls of different widths. It solves the problem that traditional fixed baffles or limiting devices with non-adjustable spacing cannot flexibly adapt to film rolls of various lengths. The effective distance between the sliding limiting ring and the support plate can be easily changed to accommodate paper cores of different lengths; the magnetic attraction is used to achieve pre-fixation and rapid release of the pull plate, avoiding the cumbersome operation and low efficiency problems caused by mechanical methods such as threaded locking. At the same time, its limiting method evenly distributes the force on the end face of the paper core, effectively avoiding the problems of deformation or internal damage to the end face of the paper core caused by excessive locking force or uneven force in traditional mechanical clamps, extending the service life of the paper core and ensuring the stability of the unwinding process.

[0017] 2. This utility model, through the arrangement of a movable cover, rollers, slide grooves, and heat baffles in the drying component, in conjunction with the upper and lower arranged heating chambers and fans, provides movable double-sided drying and heat baffle functions. It also features an open operating space, enabling upper and lower convection heating and constraining hot air flow. It solves the problems of insufficient space for material feeding before drying, low heat energy utilization, and hot air interference in the cooling zone. The design of maintaining a gap between the heat baffles and the film surface avoids hot air flowing into the cooling area, preventing reduced cooling effect and energy waste, ensuring that heat energy is concentrated and efficiently used for film drying.

[0018] 3. This utility model, through the arrangement of multiple sets of S-shaped cooling rollers, rotary joints, and fixed water pipes in the cooling components, works in conjunction with a chiller to form an S-shaped path closed-loop high-efficiency cooling system. This system effectively doubles the cooling contact area, achieves uniform cooling on both sides, and recycles cooling water. It solves the problems of membrane deformation and poor surface quality caused by insufficient or uneven cooling, as well as the high water consumption of traditional open cooling systems. The S-shaped winding path avoids uneven internal stress caused by single-sided cooling; the closed-loop system avoids excessive consumption and discharge of cooling water, while the stable water temperature supply prevents differences in cooling effect caused by water temperature fluctuations. Attached Figure Description

[0019] Figure 1 This is the front view of this utility model; Figure 2 This is a schematic diagram of the winding mechanism of this utility model; Figure 3 This is a cross-sectional view of the support ring of this utility model; Figure 4 This is a schematic diagram of the structure of the drying component of this utility model; Figure 5 This is a schematic diagram of the structure of the electric heating tube of this utility model; Figure 6 This is a structural schematic diagram of the cooling component of this utility model.

[0020] In the diagram: 1. Chassis; 2. Winding mechanism; 21. First motor; 22. Rotating shaft; 23. Support plate; 24. Stretch film; 25. Arc-shaped magnetic block; 26. Limiting component; 261. Limiting ring; 262. Pulling plate; 263. Compression spring; 27. Magnetic frame; 28. Support ring; 3. Slide groove; 4. Drying component; 41. Fan; 42. Air duct; 43. Heating chamber tube; 44. Electric heating tube; 45. Movable cover; 46. Roller; 47. Heat shield; 5. Cooling component; 51. Second motor; 52. Coupling; 53. Cooling roller; 54. Rotary joint; 55. Fixed water pipe; 56. Third motor; 57. Take-up roller; 58. Support cylinder; 6. Chiller. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose. Example 1

[0022] Please see Figure 1 - Figure 6 This utility model provides a technical solution: an energy-saving drying device for stretch film, including a casing 1 and a chiller 6. A stretching mechanism 2 is installed on the inner wall of the casing 1, and a groove 3 is formed on the outer surface of the casing 1. The stretching mechanism 2 also has: The first motor 21 is mounted on the inner wall of the housing 1, and the output end of the first motor 21 is fixedly connected to the rotating shaft 22; Drying component 4 is rotatably connected to the upper surface of slide 3, and drying component 4 is equipped with fan 41; Cooling component 5 is installed on the inner wall of the chassis 1, and includes a second motor 51.

[0023] A support plate 23 is rotatably connected to the outer surface of the rotating shaft 22. A winding film 24 is sleeved on the outer surface of the rotating shaft 22. An arc-shaped magnetic block 25 is embedded in the inner wall of the rotating shaft 22. A limit component 26 is installed on the outer surface of the rotating shaft 22. A magnetic frame 27 is provided on the outer side of the end of the rotating shaft 22 away from the first motor 21. A support ring 28 is installed on the outer surface of the magnetic frame 27. The magnetic frame 27 is magnetic and attracts each other with the magnetic material pre-embedded in the inner wall of the housing 1, thereby providing magnetic auxiliary support for one end of the rotating shaft 22 without complex mechanical connections, enhancing the stability of the rotating shaft 22 during operation. At the same time, this connection method facilitates quick disassembly for roll changing operations. The drying component 4 is located on the upper and lower sides of the winding film 24.

[0024] One end of the support plate 23 is fixed to the outer surface of the chassis 1. Multiple sets of arc-shaped magnetic blocks 25 are provided. The inner surface of the support ring 28 is rotatably connected to the outer surface of the rotating shaft 22.

[0025] The limiting component 26 includes: A limiting ring 261 is included, with a pull plate 262 slidably connected to its inner wall. A compression spring 263 is fixed to the outer surface of the pull plate 262. The pull plate 262 is made of magnetic material and can be attracted to the arc-shaped magnetic block 25. Under the action of magnetic attraction, it can achieve quick pre-positioning or temporary fixation to prevent accidental slippage.

[0026] The inner surface of the limiting ring 261 is slidably connected to the outer surface of the rotating shaft 22, and the top end of the compression spring 263 is installed on the inner wall of the limiting ring 261.

[0027] A duct 42 is fixedly connected to the side of the fan 41. A heating chamber tube 43 is fixedly connected to the end of the duct 42 away from the fan 41. An electric heating tube 44 is fixedly connected to the inner wall of the heating chamber tube 43. A movable cover 45 is installed on the outer surface of the heating chamber tube 43. A roller 46 is rotatably connected to the inner wall of the movable cover 45. A heat baffle 47 is installed on the lower surface of the movable cover 45. The power supply for the electric heating tube 44 is connected to an external power source and control system through a high-temperature resistant cable passing through the upper surface of the casing 1. This arrangement ensures the safety and reliability of high current transmission.

[0028] The fan 41 is installed on the upper surface of the heating chamber tube 43, and the outer surface of the roller 46 is in rolling connection with the inner surface of the slide groove 3.

[0029] A coupling 52 is fixedly connected to the output end of the second motor 51. A cooling roller 53 is fixedly connected to the end of the coupling 52 away from the output end of the second motor 51. A rotary joint 54 is fixedly connected to the end of the cooling roller 53 away from the coupling 52. A fixed water pipe 55 is installed at the end of the rotary joint 54 away from the cooling roller 53. The fixed water pipe 55 is connected to the outlet of the chiller 6 to supply cooling water. The rotary joint 54 acts as a dynamic sealing interface, allowing the cooling roller 53 to rotate while seamlessly guiding the cooling water into its internal spiral flow channel and discharging the heated water, forming a closed-loop cooling circuit.

[0030] A third motor 56 is located on one side of the second motor 51. A take-up roller 57 is fixedly connected to the output end of the third motor 56, and a support cylinder 58 is slidably connected to the outer surface of the take-up roller 57. Similar to the magnetic frame 27, the support cylinder 58 is made of magnetic material. Its function is to use magnetic force to adhere to a specific position on the inner wall of the housing 1, providing a driven support for the free end of the take-up roller 57 that can be quickly positioned and removed. This design eliminates the need for a traditional slide rail locking mechanism, simplifying operation. When changing rolls, only the magnetic force needs to be overcome to move the support cylinder 58 away and remove the heavy film roll.

[0031] Multiple sets of the second motor 51 are arranged in an intermittent S-shape. The outer surface of the rotary joint 54 is rotatably connected to the inner surface of the housing 1. The end of the fixed water pipe 55 away from the rotary joint 54 is fixedly connected to the outer surface of the chiller 6. The outer surface of the third motor 56 is fixedly connected to the inner wall of the housing 1. The outer surface of the support cylinder 58 is slidably connected to the inner surface of the housing 1. The wrapping film 24 passes around multiple sets of cooling rollers 53 in an "S" shaped path, thereby multiplying the contact area and contact time between the film and the cooling rollers 53 to ensure uniform, efficient and thorough cooling. The support cylinder 58 is magnetically attracted to a magnetic base preset on the inner wall of the housing 1. Its "sliding connection" means that it can slide along the preset path to the magnetic attraction position and be fixed, or slide away from that position.

[0032] The overall working principle is as follows: This equipment is an energy-saving wrapping film processing device that integrates drying and cooling functions. Its working principle is based on the combined effect of magnetic assisted clamping, upper and lower convection hot air drying, S-shaped path cooling and closed water cooling system, which realizes efficient and uniform film processing and effectively overcomes the problems of cumbersome operation, high energy consumption, heat and cold interference and uneven cooling of traditional equipment.

[0033] In the initial state of the equipment, the movable cover 45 of the drying component 4 is in the closed state. The operator can push the movable cover 45 and move it along the slide groove 3 of the machine box 1 with the help of the bottom rollers 46, thereby opening the upper operating area to facilitate the subsequent feeding of the stretch film 24. This equipment is adapted to lightweight stretch film rolls with paper cores, which are easy to handle and install manually.

[0034] During operation, the stretch film 24 roll is first placed on the rotating shaft 22, and then the limiting component 26 and the magnetic frame 27 are installed. By pulling the pull plate 262 upward, the compression spring 263 is stretched, creating a height gap between the bottom of the pull plate 262 and the arc-shaped magnetic block 25 embedded in the rotating shaft 22. Then, the limiting ring 261 is pressed against the end face of the paper core, and the pull plate 262 is released. Under the action of the spring force, it is attracted and fixed to the arc-shaped magnetic block 25, thereby achieving quick and adjustable limiting of stretch film rolls of different lengths without compressing the end face of the paper core. Subsequently, the magnetic frame 27 is inserted into the circular slot opened on the outer surface of the machine housing 1 to achieve adsorption and fixation. The non-driving end of the rotating shaft 22 is supported by the support ring 28 fixed inside the magnetic frame 27.

[0035] During the feeding process, the initial end of the wound film roll is led out from the exposed space and wound around each cooling roller 53 in an S-shaped path to ensure full surface adhesion. The end is then fixed to the adhesive surface of the take-up roller 57 with high-temperature tape.

[0036] The drive end of the rotating shaft 22 is directly driven by the first motor 21, while the non-drive end is attracted to the magnetic material inside the housing via the magnetic frame 27, forming a stable magnetic auxiliary support. The non-drive end of the take-up roller 57 is also attracted and fixed by the magnetic support cylinder 58, taking into account both stability and ease of unwinding. The area where the housing 1 and the take-up roller 57 are in contact is also equipped with magnetic adsorption material to ensure the fixation and installation of the take-up roller 57.

[0037] During the drying process, the first motor 21 and the third motor 56 work together to maintain the constant speed of the wrapping film 24. The fan 41 sends airflow into the heating chamber tube 43, which is heated by the electric heating tube 44 and then blown onto the film surface from the top and bottom sides of the wrapping film 24. The heat shield 47 at the bottom of the movable cover 45 maintains a gap of 5-15 mm with the film surface, which can effectively prevent most of the hot air from interfering with the cooling zone, reduce heat loss, and avoid scratching the film material.

[0038] The dried film immediately enters the cooling stage to eliminate thermal stress and prevent warping or wrinkling after winding. A second motor 51 drives the cooling roller 53 to rotate. Cooling water supplied by the chiller 6 is sent into the spiral flow channel inside the roller via a fixed water pipe 55 and a rotary joint 54. After absorbing heat, the water returns to the chiller 6, forming a closed-loop circulation, ensuring cooling efficiency and water conservation. The S-shaped arrangement significantly increases the contact area and cooling time, achieving uniform cooling on both sides and preventing problems such as film deformation, surface defects, or winding adhesion. After completion, the movable cover 45 is reset to prevent heat from the drying process from rapidly dissipating from the upper space.

[0039] Finally, during winding, the third motor 56 works in conjunction with the first motor 21 to maintain stable tension, ensuring the film roll is tight and flat. After winding is complete, the operator can use the bottom rollers 46 to move along the inside of the slide 3, thereby pushing the movable cover 45 to open the operating area above the machine housing 1, making it easier for the operator to remove the magnetic support cylinder 58 and unload the finished film roll. Then, the magnetic frame 27 and the limiting component 26 are released, and the paper core is removed, facilitating the installation of a new wrapping film 24 roll at the subsequent workstation.

[0040] It should be noted that the stretch film 24 of this equipment has an additional section of dedicated blank process tail film at its rear end. This tail film is located at the innermost layer of the stretch film 24 roll, and its function is to maintain the connection with the paper core tube of the rotating shaft 22 after the effective film roll has completed the drying and winding process, and to continuously maintain the system tension. After the effective stretch film 24 has been completely dried, cooled and wound into the take-up roller 57, the operator can manually cut this section of blank tail film between the rotating shaft 22 and the take-up roller 57. This operation ensures that the entire tension system does not suddenly relax at the moment of separation of the effective film roll, thereby avoiding problems such as film shaking, shrinkage or even falling off the guide roller caused by a sudden decrease in tension. At the same time, this design also ensures that the end of the winding remains flat and tight, effectively improving the overall quality of the finished roll.

[0041] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. An energy-saving drying device for stretch film, comprising a casing (1) and a chiller (6), characterized in that: The inner wall of the casing (1) is equipped with a winding mechanism (2), and the outer surface of the casing (1) is provided with a sliding groove (3). The winding mechanism (2) also has the following features: The first motor (21) is mounted on the inner wall of the casing (1), and the output end of the first motor (21) is fixedly connected to a rotating shaft (22). Drying component (4), which is rolledly connected to the upper surface of the chute (3), and the drying component (4) is equipped with a fan (41). Cooling component (5), which is installed on the inner wall of the chassis (1), includes a second motor (51); The outer surface of the rotating shaft (22) is rotatably connected to a support plate (23), the outer surface of the rotating shaft (22) is covered with a winding film (24), the inner wall of the rotating shaft (22) is embedded with an arc-shaped magnetic block (25), the outer surface of the rotating shaft (22) is equipped with a limit component (26), the end of the rotating shaft (22) away from the first motor (21) is provided with a magnetic frame (27), and the outer surface of the magnetic frame (27) is equipped with a support ring (28). The limiting component (26) includes: A limiting ring (261) is provided, and a pull plate (262) is slidably connected to the inner wall of the limiting ring (261). A compression spring (263) is fixed to the outer surface of the pull plate (262).

2. The energy-saving drying equipment for stretch film according to claim 1, characterized in that: One end of the support plate (23) is fixed to the outer surface of the chassis (1), and multiple sets of the arc-shaped magnetic blocks (25) are provided. The inner surface of the support ring (28) is rotatably connected to the outer surface of the rotating shaft (22).

3. The energy-saving drying equipment for stretch film according to claim 1, characterized in that: The inner surface of the limiting ring (261) is slidably connected to the outer surface of the rotating shaft (22), and the top end of the compression spring (263) is installed on the inner wall of the limiting ring (261).

4. The energy-saving drying equipment for stretch film according to claim 1, characterized in that: A duct (42) is fixedly connected to the side of the fan (41). A heating chamber tube (43) is fixedly connected to the end of the duct (42) away from the fan (41). An electric heating tube (44) is fixedly connected to the inner wall of the heating chamber tube (43). A movable cover (45) is installed on the outer surface of the heating chamber tube (43). A roller (46) is rotatably connected to the inner wall of the movable cover (45). A heat shield (47) is installed on the lower surface of the movable cover (45).

5. The energy-saving drying equipment for stretch film according to claim 4, characterized in that: The fan (41) is installed on the upper surface of the heating chamber tube (43), and the outer surface of the roller (46) is in rolling connection with the inner surface of the groove (3).

6. The energy-saving drying equipment for stretch film according to claim 1, characterized in that: A coupling (52) is fixedly connected to the output end of the second motor (51). A cooling roller (53) is fixedly connected to the end of the coupling (52) away from the output end of the second motor (51). A rotary joint (54) is fixedly connected to the end of the cooling roller (53) away from the coupling (52). A fixed water pipe (55) is installed at the end of the rotary joint (54) away from the cooling roller (53).

7. The energy-saving drying equipment for stretch film according to claim 6, characterized in that: A third motor (56) is provided on one side of the second motor (51). A take-up roller (57) is fixedly connected to the output end of the third motor (56). A support cylinder (58) is slidably connected to the outer surface of the take-up roller (57).

8. The energy-saving drying equipment for stretch film according to claim 7, characterized in that: The second motor (51) is provided in multiple sets and is distributed intermittently in an S-shape. The outer surface of the rotary joint (54) is rotatably connected to the inner surface of the casing (1). The end of the fixed water pipe (55) away from the rotary joint (54) is fixedly connected to the outer surface of the chiller (6). The outer surface of the third motor (56) is fixedly connected to the inner wall of the casing (1). The outer surface of the support cylinder (58) is slidably connected to the inner surface of the casing (1).

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