Yarn pressing lifting device for producing medical hollow fiber membrane

Abstract

The utility model discloses a silk pressing lifting device for medical hollow fiber membrane production, which comprises a silk pressing component, a connecting component, a power component and a driving rope, the silk pressing component comprises a lifting bottom plate and a lifting frame slidably mounted on the lifting bottom plate, and the connecting component comprises a connecting plate and a fixed pulley; the power assembly comprises a fixed bottom plate and a driving source, and a lifting plate and a movable pulley are mounted on the driving source; the lifting bottom plate and the fixed bottom plate are both mounted on the connecting plate, one end of the driving rope is fixed on the connecting plate, and the other end of the driving rope bypasses the corresponding fixed pulley and the movable pulley according to a set track and then is fixed on the fixed bottom plate; the lifting frame is fixed to the driving rope, the driving source drives the lifting plate to move, the lifting plate drives the lifting frame to ascend and descend through a pulley block composed of a pulley and the driving rope, and then the water entering depth of the pressing wire is controlled. A movement combination mechanism with the driving rope matched with the pulley is adopted, water sources cannot be polluted due to the fact that the mechanism needs to be lubricated, maintenance is convenient, and the service life is long.

Description

Technical Field

[0001] The utility model relates to the technical field of medical hollow fiber membrane production equipment, and particularly relates to a wire pressing lifting device for medical hollow fiber membrane production. Background Art

[0002] Membrane separation technology is a separation technology that uses a separation membrane to separate, concentrate, and purify liquids or gases. It is widely used in fields such as blood purification, environmental water treatment, and batteries. Hollow fiber membranes are an important form of separation membranes. Among them, the wet spinning production line is an important device for producing hollow fiber membranes. That is, when the braided tube in this device passes through the spinneret, the high molecular polyester stock solution in the spinneret adheres to the braided tube and is jointly pressed into the coagulation bath water tank with the braided tube. Subsequently, it reacts with the formulated liquid contained in the coagulation bath water tank. In this process, the high molecular polyester stock solution changes from a liquid state to a solid state, forming hollow fiber membrane filaments with the braided tube as the inner support.

[0003] It can be seen that the full contact between the hollow fiber membrane filaments and the liquid in the coagulation bath water tank is an important link to ensure the quality of the membrane filaments. This link usually uses a wire pressing lifting mechanism to press the spun filaments into the coagulation bath for forming. However, the existing wire pressing lifting mechanisms mostly adopt a driving form of a chain plus a guide rod mechanism. Since it is impossible to use lubricants such as grease for lubrication when driving with a chain underwater, it is easy for the wire pressing wheel to get stuck during lifting, and the lack of lubricant will greatly shorten the service life of the chain. At the same time, when the sprocket located at the bottom of the coagulation bath water tank is damaged, replacing the sprocket requires people to enter the water tank. When the space in the water tank is limited, the entire mechanism needs to be taken out for replacement, and the maintenance is troublesome. In summary, it is urgent to improve the existing wire pressing lifting mechanism. Content of the Utility Model

[0004] In order to solve the deficiencies existing in the prior art, the utility model provides a wire pressing lifting device for medical hollow fiber membrane production, which adopts a motion combination mechanism of a driving rope and a pulley, will not pollute the water source due to the need for lubrication of the mechanism, is convenient for maintenance, has a long service life, and at the same time brings a greater wire pressing depth into the water under the same driving stroke.

[0005] The specific content is as follows:

[0006] A wire pressing lifting device for medical hollow fiber membrane production, comprising:

[0007] A wire pressing component, the wire pressing component includes a lifting bottom plate and a lifting frame slidably installed on the lifting bottom plate, and a wire guiding wheel for pressing and guiding the membrane filaments is installed on the lifting frame;

[0008] A connection component, the connection component includes a connection plate and a first fixed pulley and a second fixed pulley installed in parallel on the connection plate;

[0009] A power assembly, the power assembly includes a fixed bottom plate and a drive source mounted on the fixed bottom plate, a lifting plate driven by the drive source is mounted on the drive source, and two parallel first movable pulleys and second movable pulleys are mounted on the lifting plate;

[0010] Wherein, both the lifting bottom plate and the fixed bottom plate are mounted on the connecting plate, and a gap with a set width is provided between the lifting bottom plate and the fixed bottom plate. Third fixed pulleys and fourth fixed pulleys are respectively provided at the ends of the lifting bottom plate and the fixed bottom plate away from the connecting plate;

[0011] A driving rope, one end of the driving rope is fixed on the connecting plate, and the other end of the driving rope sequentially bypasses the first movable pulley, the first fixed pulley, the third fixed pulley, the second movable pulley, the fourth fixed pulley, and the second movable pulley and then is fixed on one end of the fixed bottom plate away from the connecting plate;

[0012] Wherein, the lifting frame is fixed to the driving rope, the drive source drives the lifting plate to move, and the lifting plate drives the lifting frame to move through a pulley block composed of pulleys and the driving rope.

[0013] In a specific embodiment of the present invention, the connecting plate is horizontally arranged, the lifting bottom plate and the fixed bottom plate are vertically and parallelly arranged, and the upper ends of both are fixed on the lower surface of the connecting plate, and the lifting frame is vertically and slidably mounted on the lifting bottom plate.

[0014] In a specific embodiment of the present invention, the first fixed pulley and the second fixed pulley are coaxially arranged on the same horizontal rotating shaft, and a fifth fixed pulley and a sixth fixed pulley coaxially arranged on the same horizontal rotating shaft are also mounted on the connecting plate, and the driving rope bypasses the first fixed pulley and then sequentially bypasses the fifth fixed pulley, the third fixed pulley, the sixth fixed pulley and the second fixed pulley.

[0015] In a specific embodiment of the present invention, a seventh fixed pulley is also mounted on the connecting plate, a third movable pulley and a fourth movable pulley are also mounted on the lifting plate, the fourth fixed pulley is mounted at the lower end of the fixed bottom plate through a support plate, and an eighth fixed pulley parallel and at the same height as the fourth fixed pulley is also mounted on the support plate. One end of the driving rope is fixed on the connecting plate, and the other end of the driving rope sequentially bypasses the first movable pulley, the seventh fixed pulley, the third movable pulley, the first fixed pulley, the fifth fixed pulley, the third fixed pulley, the sixth fixed pulley, the second fixed pulley, the eighth fixed pulley, the fourth movable pulley, the fourth fixed pulley and the second movable pulley and then is fixed on the support plate.

[0016] In a specific embodiment of the present utility model, the driving rope is a steel wire rope, and the steel wire ropes between the connecting plate and the lifting plate, between the lifting plate and the supporting plate, and between the connecting plate and the third fixed pulley are all in a vertical state.

[0017] In a specific embodiment of the present utility model, all the fixed pulleys and movable pulleys are rotatably installed at corresponding positions through ceramic bearings.

[0018] In a specific embodiment of the present utility model, the driving source is a linear driving module vertically fixed on the fixed bottom plate, which is located between the connecting plate and the supporting plate. The lifting plate is fixed on the driving component of the linear driving module, and the first movable pulley, the second movable pulley, the third movable pulley and the fourth movable pulley are installed on the lifting plate in parallel and at the same height.

[0019] In a specific embodiment of the present utility model, the connections between the driving rope and the connecting plate and between the driving rope and the supporting plate are both made by using sling rings. The sling ring is provided with a stud integrally formed therewith, the driving rope is fixed on the sling ring, and the sling ring is threadedly connected to the connecting plate or the supporting plate.

[0020] In a specific embodiment of the present utility model, symmetrically arranged cylindrical guide rails are provided on both sides of the lifting bottom plate. Two groups of symmetrically arranged guide wheels are provided on the lifting frame. The number of guide wheels in each group is at least two, and the guide wheels are all rotatably installed on the lifting frame through ceramic bearings. The two groups of guide wheels are clamped on both sides of the lifting bottom plate, and the guide wheels and the guide rails are correspondingly matched to form a sliding guiding fit, so that the lifting frame vertically slides on the lifting bottom plate through the cooperation of the guide wheels and the guide rails.

[0021] In a specific embodiment of the present utility model, a plurality of horizontally parallel cylindrical rods are further provided on the lifting frame, and the wire guiding wheels are rotatably installed on the cylindrical rods coaxially through ceramic bearings.

[0022] The beneficial effects of the present utility model:

[0023] The utility model adopts a driving form that combines a driving rope and a pulley, enabling the lifting frame to adopt a sliding structure of a guide wheel and a guide rail. Since both the guide wheel and the wire guide wheel are installed with ceramic bearings, they have good smoothness in water and do not require additional lubricating media. Therefore, there is no lubricating medium in the water-entry part of the entire mechanism, so the liquid in the coagulation bath water tank will not be polluted, and it is convenient for maintenance and has a long service life. At the same time, within a limited stroke, the lifting plate can multiply the movement stroke of the lifting frame through the driving form of the cooperation between the driving rope and the pulley, thereby bringing a greater wire-pressing water-entry depth under the same driving stroke. Moreover, the lifting plate and the lifting frame move in a relatively parallel state, located outside and inside the tank respectively, without additionally increasing the height of the entire device, which can save costs and reduce installation limitations and has better adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 FIG. is a schematic three-dimensional structure diagram of a wire-pressing lifting device for the production of medical hollow fiber membranes according to an embodiment of the present invention;

[0025] Figure 2 is Figure 1 front view of;

[0026] Figure 3 is Figure 1 schematic three-dimensional structure diagram of another perspective;

[0027] Figure 4 is Figure 3 enlarged view of A in;

[0028] Figure 5 is Figure 1 schematic connection relationship diagram between the driving rope and each pulley in;

[0029] Explanation of the reference numerals in the figure: 11, lifting bottom plate; 12, guide rail; 13, lifting frame; 14, guide wheel; 15, cylindrical rod; 16, wire guide wheel; 17, clamping block; 18, third fixed pulley; 21, connecting plate; 22, first fixed pulley; 23, second fixed pulley; 24, fifth fixed pulley; 25, sixth fixed pulley; 26, seventh fixed pulley; 30, fixed bottom plate; 31, driving source; 32, lifting plate; 33, first movable pulley; 34, second movable pulley; 35, third movable pulley; 36, fourth movable pulley; 37, support plate; 38, fourth fixed pulley; 39, eighth fixed pulley; 41, driving rope; 42, lifting ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present invention will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the embodiments cited are not intended to limit the present invention.

[0031] Embodiment, with reference to Figures 1 to 5 As shown, a wire pressing lifting device for the production of medical hollow fiber membranes includes a wire pressing assembly, a connecting assembly, a power assembly, and a driving rope 41. The wire pressing assembly includes a lifting bottom plate 11 and a lifting frame 13 slidably mounted on the lifting bottom plate 11. The connecting assembly includes a connecting plate 21 and a fixed pulley. The power assembly includes a fixed bottom plate 30 and a driving source 31. An elevating plate 32 and a movable pulley are mounted on the driving source 31. Both the lifting bottom plate 11 and the fixed bottom plate 30 are mounted on the connecting plate 21. One end of the driving rope 41 is fixed to the connecting plate 21, and the other end of the driving rope 41 is fixed to the fixed bottom plate 30 after bypassing the corresponding fixed pulley and movable pulley according to a set track. And the lifting frame 13 is fixed to the driving rope 41. The driving source 31 drives the elevating plate 32 to move, and the elevating plate 32 drives the lifting frame 13 to lift through a pulley block composed of the pulley and the driving rope 41, so as to control the depth of the wire pressing into the water.

[0032] The utility model adopts a driving form of matching the driving rope 41 with the pulley, so that the lifting frame 13 can adopt a sliding structure of the guide wheel 14 and the guide rail 12. Since both the guide wheel 14 and the wire guiding wheel 16 are installed with ceramic bearings, their smoothness in water is very good, and no additional lubricating medium needs to be added. Therefore, there is no lubricating medium in the water inlet part of the whole mechanism, so the liquid in the coagulation bath water tank will not be polluted, and it is convenient to maintain and has a long service life. At the same time, within a limited stroke, the elevating plate 32 can multiply the movement stroke of the lifting frame 13 through the driving form of matching the driving rope 41 with the pulley, so as to bring a greater depth of wire pressing into the water under the same driving stroke. And the elevating plate 32 and the lifting frame 13 are in a relatively parallel movement state, located outside and inside the tank respectively, without additionally increasing the height of the whole device, which can save costs and reduce installation limitations and has better adaptability.

[0033] In a specific embodiment of the present utility model, the wire pressing assembly includes a lifting bottom plate 11 and a lifting frame 13 slidably mounted on the lifting bottom plate 11. A wire guiding wheel 16 for pressing and guiding the film wire is mounted on the lifting frame 13. Specifically, cylindrical guide rails 12 are symmetrically arranged on both sides of the lifting bottom plate 11. Two groups of symmetrically arranged guiding wheels 14 are provided on the lifting frame 13. The number of each group of guiding wheels 14 is at least two to ensure the stability of the cooperation. Moreover, the guiding wheels 14 are rotatably mounted on the lifting frame 13 through ceramic bearings. The ceramic bearings have good smoothness in water and do not require additional lubricating medium. An arc groove matching the guide rail 12 is provided on the guiding wheel 14. The two groups of guiding wheels 14 clamp both sides of the lifting bottom plate 11 through their arc grooves, and the guiding wheels 14 and the guide rails 12 are correspondingly matched to form a sliding guiding fit, so that the lifting frame 13 reciprocally slides on the lifting bottom plate 11 through the cooperation of the guiding wheels 14 and the guide rails 12. A plurality of horizontally parallel cylindrical rods 15 are further provided on the lifting frame 13. The number of the cylindrical rods 15 can be selected according to needs. The wire guiding wheel 16 is coaxially rotatably mounted on the free end of the cylindrical rod 15 through a ceramic bearing. After the spinning equipment spins out the wire, the wire is quickly wound around the wire guiding wheel 16. The ceramic bearing has good smoothness in water, which can minimize the influence on the wire caused by the unsmooth rotation of the bearing.

[0034] The connecting assembly includes a connecting plate 21, a first fixed pulley 22 and a second fixed pulley 23 horizontally mounted on the connecting plate 21. The connecting plate 21 is horizontally arranged. The lifting bottom plate 11 and the fixed bottom plate 30 are vertically and parallelly arranged, and the upper ends of both are fixed on the lower surface of the connecting plate 21. The lifting frame 13 is vertically slidably mounted on the lifting bottom plate 11. A spacing for the coagulation bath water tank body to extend into is provided between the lifting bottom plate 11 and the fixed bottom plate 30. That is, during installation, the whole device straddles the tank body of the coagulation bath through the space between the lifting bottom plate 11 and the fixed bottom plate 30. The lower part of the wire pressing assembly is inserted into the liquid in the coagulation bath water tank. The power assembly is located outside the coagulation bath water tank. The connecting plate 21 is connected to external equipment. The lower end of the lifting bottom plate 11 is fixed to the tank body of the coagulation bath, thereby realizing the installation of the whole device. The first fixed pulley 22 and the second fixed pulley 23 are coaxially arranged on the same horizontal rotating shaft. Moreover, a fifth fixed pulley 24 and a sixth fixed pulley 25 coaxially arranged on the same horizontal rotating shaft are further mounted on the connecting plate 21. The first fixed pulley 22 and the fifth fixed pulley 24 are correspondingly parallel, and the second fixed pulley 23 and the sixth fixed pulley 25 are correspondingly parallel. The driving rope 41 bypasses the first fixed pulley 22 and then successively bypasses the fifth fixed pulley 24, the third fixed pulley 18, the sixth fixed pulley 25 and the second fixed pulley 23.

[0035] The power assembly includes a fixed bottom plate 30 and a drive source 31 mounted on the fixed bottom plate 30. A lifting plate 32 driven by the drive source 31 is mounted on the drive source 31. The drive source 31 is a linear drive module vertically fixed on the fixed bottom plate 30. The linear drive module is located between the connecting plate 21 and the support plate 37. The lifting plate 32 is fixed on the driving component of the linear drive module. Specifically, the linear drive module is a lead screw and nut structure. One end of the lead screw is provided with a motor for driving its rotation. The lifting plate 32 is mounted on the nut. The motor drives the lead screw to rotate, thereby driving the lifting plate 32 connected to the nut to vertically lift and lower.

[0036] The lifting plate 32 is provided with a first movable pulley 33 and a second movable pulley 34, a third movable pulley 35 and a fourth movable pulley 36 that are of equal height and parallel to each other. A seventh fixed pulley 26 is also mounted on the connecting plate 21. Third fixed pulleys 18 and fourth fixed pulleys 38 are respectively provided at the ends of the lifting bottom plate 11 and the fixed bottom plate 30 that are far from the connecting plate 21. The fourth fixed pulley 38 is mounted on the lower end of the fixed bottom plate 30 through the support plate 37. An eighth fixed pulley 39 parallel and of equal height to the fourth fixed pulley 38 is also mounted on the support plate 37. One end of the drive rope 41 is fixed on the connecting plate 21. The other end of the drive rope 41 sequentially bypasses the first movable pulley 33, the seventh fixed pulley 26, the third movable pulley 35, the first fixed pulley 22, the fifth fixed pulley 24, the third fixed pulley 18, the sixth fixed pulley 25, the second fixed pulley 23, the eighth fixed pulley 39, the fourth movable pulley 36, the fourth fixed pulley 38 and the second movable pulley 34 and is then fixed on the support plate 37. The drive rope 41 is a steel wire rope. The steel wire ropes between the connecting plate 21 and the lifting plate 32, between the lifting plate 32 and the support plate 37, and between the connecting plate 21 and the third fixed pulley 18 are all in a vertical state. All the fixed pulleys and movable pulleys are rotationally mounted at corresponding positions through ceramic bearings. The connections between the drive rope 41 and the connecting plate 21 and between the drive rope 41 and the support plate 37 are both connected by a lifting ring 42. The lifting ring 42 is provided with a stud integrally formed therewith. The drive rope 41 is fixed on the lifting ring 42. The lifting ring 42 is threadedly connected to the connecting plate 21 or the support plate 37.

[0037] Then, the drive rope 41 between the fifth fixed pulley 24 and the third fixed pulley 18 is clamped on the lifting frame 13 by the clamping block 17. Furthermore, the lifting frame 13 is driven to vertically reciprocate up and down by the drive rope 41, as Figure 5As shown, that is to say, the linear drive module drives the lifting plate 32 to move upward, and pulls the lifting frame 13 to move downward through the drive rope 41. Conversely, the linear drive module drives the lifting plate 32 to move downward, and pulls the lifting frame 13 to move upward through the drive rope 41. In the present invention, through the setting of the position and quantity of the pulleys, when the lifting plate 32 moves a unit distance, one end of the lifting frame 13 can move a distance four times that of the lifting plate 32. Therefore, within a limited stroke of the lifting plate 32, through the driving form of the cooperation between the drive rope 41 and the pulleys, the movement stroke of the lifting frame 13 can be magnified several times, thereby bringing a greater depth of pressing the wire into the water under the same driving stroke. Moreover, the lifting plate 32 and the lifting frame 13 are in a relatively parallel movement state, located outside and inside the groove respectively, without additionally increasing the height of the entire device, which can save costs and reduce installation limitations, and has better adaptability.

[0038] The above-described embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A wire pressing and lifting device for producing medical hollow fiber membranes, characterized in that: include: A wire pressing assembly, the wire pressing assembly comprising a lifting bottom plate and a lifting frame slidably mounted on the lifting bottom plate, the lifting frame being mounted with a wire guide wheel for pressing and guiding the film wire; A connecting assembly, the connecting assembly comprising a connecting plate and a first fixed pulley and a second fixed pulley installed in parallel on the connecting plate; A power assembly, the power assembly comprising a fixed base plate and a driving source mounted on the fixed base plate, a lifting plate driven by the driving source being mounted on the driving source, and two parallel first movable pulleys and a second movable pulley being mounted on the lifting plate; Wherein, the lifting bottom plate and the fixed bottom plate are both mounted on the connecting plate, and a gap of a set width is provided between the lifting bottom plate and the fixed bottom plate, and a third fixed pulley and a fourth fixed pulley are respectively provided at the ends of the lifting bottom plate and the fixed bottom plate away from the connecting plate; A driving rope, one end of which is fixed to the connecting plate, and the other end of which is fixed to an end of the fixed bottom plate away from the connecting plate after passing through the first movable pulley, the first fixed pulley, the third fixed pulley, the second fixed pulley, the fourth fixed pulley, and the second movable pulley in sequence; The lifting frame is fixed to the driving rope, the driving source drives the lifting plate to move, and the lifting plate drives the lifting frame to move via a pulley group composed of a pulley and a driving rope.

2. A wire pressing and lifting device for producing medical hollow fiber membranes as claimed in claim 1, characterized in that: The connecting plate is arranged horizontally, the lifting bottom plate and the fixed bottom plate are arranged vertically and in parallel, and the upper ends of both are fixed on the lower surface of the connecting plate, and the lifting frame is vertically slidably installed on the lifting bottom plate.

3. A wire pressing and lifting device for producing medical hollow fiber membranes as claimed in claim 2, characterized in that: The first fixed pulley and the second fixed pulley are coaxially arranged on the same horizontal rotating shaft, and the fifth fixed pulley and the sixth fixed pulley coaxially arranged on the same horizontal rotating shaft are also installed on the connecting plate. The driving rope passes around the first fixed pulley and then passes around the fifth fixed pulley, the third fixed pulley, the sixth fixed pulley and the second fixed pulley in sequence.

4. A wire pressing and lifting device for producing medical hollow fiber membranes as claimed in claim 3, characterized in that: A seventh fixed pulley is also installed on the connecting plate, and a third movable pulley and a fourth movable pulley are also installed on the lifting plate. The fourth fixed pulley is installed on the lower end of the fixed bottom plate through a supporting plate, and an eighth fixed pulley parallel to and having the same height as the fourth fixed pulley is also installed on the supporting plate. One end of the driving rope is fixed on the connecting plate, and the other end of the driving rope is fixed on the supporting plate after passing through the first movable pulley, the seventh fixed pulley, the third movable pulley, the first fixed pulley, the fifth fixed pulley, the third fixed pulley, the sixth fixed pulley, the second fixed pulley, the eighth fixed pulley, the fourth movable pulley, the fourth fixed pulley and the second movable pulley in sequence.

5. A wire pressing and lifting device for producing medical hollow fiber membranes as claimed in claim 4, characterized in that: The driving rope is a steel wire rope, and the steel wire rope between the connecting plate and the lifting plate, the steel wire rope between the lifting plate and the supporting plate, and the steel wire rope between the connecting plate and the third fixed pulley are all in a vertical state.

6. A wire pressing and lifting device for producing medical hollow fiber membranes as claimed in claim 4, characterized in that: All the fixed pulleys and movable pulleys are rotatably installed at corresponding positions through ceramic bearings.

7. A wire pressing and lifting device for producing medical hollow fiber membranes as claimed in claim 4, characterized in that: The driving source is a linear driving module vertically fixed on the fixed base plate, the linear driving module is located between the connecting plate and the supporting plate, the lifting plate is fixed on the driving component of the linear driving module, and the first movable pulley, the second movable pulley, the third movable pulley and the fourth movable pulley are installed on the lifting plate in parallel and at the same height.

8. A wire pressing and lifting device for producing medical hollow fiber membranes as claimed in claim 4, characterized in that: The connection between the driving rope and the connecting plate and the connection between the driving rope and the supporting plate are both connected by a lifting ring, on which a stud integrally formed therewith is provided, the driving rope is fixed to the lifting ring, and the lifting ring is connected to the connecting plate or the supporting plate by threads.

9. A wire pressing and lifting device for producing medical hollow fiber membranes as claimed in claim 1, characterized in that: Symmetrically arranged cylindrical guide rails are provided on both sides of the lifting base plate, and two groups of symmetrical guide wheels are provided on the lifting frame. The number of guide wheels in each group is at least two, and the guide wheels are rotatably mounted on the lifting frame through ceramic bearings. The two groups of guide wheels are clamped on both sides of the lifting base plate, and the guide wheels and the guide rails are matched to form a sliding guide fit, so that the lifting frame slides vertically on the lifting base plate through the fit between the guide wheels and the guide rails.

10. A wire pressing and lifting device for producing medical hollow fiber membranes according to claim 1, characterized in that: The lifting frame is also provided with a plurality of cylindrical rods arranged horizontally and in parallel, and the wire guide wheel is coaxially rotatably mounted on the cylindrical rods via ceramic bearings.

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