Adjustable paper roll blocking mechanism

Abstract

The utility model relates to paper winding machine auxiliary equipment technical field discloses a kind of conveniently adjustable paper winding machine baffle mechanism, including rack, two mounting frames, interval adjusting assembly, two mounting plates, two sliding seats, lifting adjusting assembly, transmission assembly and multiple guide bars;The crossbeam is fixedly installed on rack, and two mounting frames are slidably installed on crossbeam.The utility model has following advantages and effects:the horizontal interval between two sides guide bar can be adjusted to adapt to the production requirement of different width paper winding, the overall height position of guide bar can be adjusted to meet the guide height requirement of paper winding in different processing stages, and the guide bar with corresponding size guide groove can be selected or disassembled and replaced according to the thickness specification of paper winding, so that the stability of paper winding in transmission process can be effectively improved, and the occurrence of wrinkle and deviation phenomenon is reduced.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary equipment technology for paper roll machines, and in particular to an adjustable baffle mechanism for paper roll machines. Background Technology

[0002] In the production of paper products such as toilet paper, packaging paper, and label paper, roll paper machines need to use baffle mechanisms to guide and prevent deviation of the paper feed, so as to ensure the regularity of the roll formation. Existing paper roll machine baffle mechanisms suffer from poor adaptability, insufficient limiting stability, and inconvenient maintenance: First, traditional baffles are mostly fixed-width or have a single adjustable structure, making it difficult to flexibly adapt to different paper widths. Switching between specifications requires disassembling and replacing baffle components, resulting in long downtime and low production efficiency. Second, the contact area between the baffle and the paper is mostly a planar structure, which can easily cause "edge jumping" or deviation during paper feeding due to edge lifting and tension fluctuations. This is especially true for thin paper and high-speed rolling scenarios, where the limiting effect is even worse, easily causing paper wrinkles and edge wear. Third, although some baffles have adjustable structures, they lack stable guidance during adjustment, making them prone to positional deviation. Fourth, existing guiding structures are not optimized for differences in paper thickness. A single guiding gap can easily cause thick paper to be squeezed and deformed or thin paper to wobble, making it difficult to ensure the conveying stability of different paper sizes and restricting the adaptability of paper roll machines to diverse production scenarios.

[0003] Therefore, this utility model proposes an adjustable baffle mechanism for a paper roll machine to solve the above problems.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide an adjustable baffle mechanism for a paper roll machine. This mechanism allows for quick adjustment of the horizontal spacing between the guide bars on both sides to adapt to the production needs of paper rolls of different widths. It also allows for adjustment of the overall height of the guide bars to meet the guiding height requirements of the paper roll at different processing stages. Furthermore, it facilitates the selection or replacement of guide bars with corresponding guide grooves according to the thickness specifications of the paper roll, thereby forming a stable guiding constraint on the paper roll, effectively improving the stability of the paper roll during transmission, and reducing the occurrence of wrinkles and deviations.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a convenient adjustable paper roll machine baffle mechanism, including a frame, two mounting frames, a crossbeam, a spacing adjustment component, two mounting plates, two sliding seats, a lifting adjustment component, a transmission component, and multiple guide bars;

[0007] The crossbeam is fixedly installed on the frame, and the two mounting brackets are slidably installed on the crossbeam. The two sliding seats are slidably installed on the side of the two mounting brackets that are close to each other. The two mounting plates are fixedly installed on the side of the two sliding seats that are close to each other. Multiple guide strips can be detachably installed on the corresponding mounting plates. The multiple guide strips are all located on the side of the two mounting plates that are close to each other. The multiple guide strips are provided with guide grooves. The width of the multiple guide grooves close to the same mounting plate decreases from top to bottom.

[0008] The spacing adjustment component is mounted on the frame and crossbeam and connected to two mounting brackets. The lifting adjustment component is mounted on two mounting brackets and connected to two sliding seats. The transmission component is mounted on two mounting brackets and connected to the lifting adjustment component. An adjustment motor is fixedly mounted on the top side of one of the mounting brackets, and the output shaft of the adjustment motor is connected to the lifting adjustment component.

[0009] A further feature of this invention is that the spacing adjustment assembly includes a dual-axis motor and two lead screws. The dual-axis motor is fixedly mounted on the crossbeam, and each of the two output shafts of the dual-axis motor is axially fixedly connected to a lead screw. The threads of the two lead screws face opposite directions, and the two lead screws are respectively threadedly connected to the mounting bracket on the corresponding side.

[0010] By adopting the above technical solution, the distance between the two mounting brackets can be adjusted as needed, thereby adjusting the distance between the guide strips on both sides, which facilitates the positioning and guidance of papers of different sizes.

[0011] A further feature of this invention is that the lifting and adjusting assembly includes two lead screws, each of which is rotatably mounted on two mounting brackets and threadedly connected to a corresponding sliding seat. The two lead screws are arranged parallel to each other, and the output shaft of the adjusting motor is axially fixedly connected to the corresponding lead screw.

[0012] By adopting the above technical solution, the height of the sliding seat can be adjusted when the lead screw rotates, thereby enabling the use of guide bars of different heights to guide and limit the paper.

[0013] A further feature of this invention is that the transmission assembly includes a telescopic shaft and four bevel gears. The same telescopic shaft is rotatably mounted on two mounting brackets. Bevel gears are fixedly sleeved at both ends of the telescopic shaft and at the bottom ends of the two lead screws. The two bevel gears located on the same side mesh with each other, and the threads on the two lead screws face opposite directions.

[0014] By adopting the above technical solution, the synchronous rotation of the two lead screws can be achieved, thereby achieving the effect of controlling the synchronous lifting and lowering of the two sliding seats.

[0015] A further feature of this invention is that guide plates are fixedly installed on the sides of the two mounting brackets that are far apart from each other, two convex openings are provided on the frame, the two guide plates are slidably installed in the corresponding convex openings, and limit plates are fixedly installed on the sides of the two guide plates that are far apart from each other.

[0016] By adopting the above technical solution, the mounting frame can be provided with support and guidance, while the range of its lateral displacement adjustment can be limited.

[0017] A further feature of this invention is that a plurality of guide rods are fixedly installed on the frame, which are arranged parallel to each other with the lead screw, and the plurality of guide rods are slidably connected to two mounting brackets.

[0018] By adopting the above technical solution, the guide block can be used to achieve stable guidance and support for the mounting frame, thereby enabling it to maintain good stability when adjusting lateral displacement.

[0019] A further feature of this invention is that multiple vertically arranged guide rods are fixedly installed on both mounting brackets, and the multiple guide rods are slidably connected to their respective sliding seats.

[0020] By adopting the above technical solution, a stable guide can be provided for the sliding seat, thereby enabling it to maintain good stability when adjusting its height.

[0021] A further feature of this invention is that multiple slots are provided on the side of the two mounting plates that are close to each other, and limit strips are fixedly installed on multiple guide strips. The multiple limit strips are respectively snapped into the corresponding slots and fixedly connected by bolts.

[0022] By adopting the above technical solution, it is easy to disassemble and assemble the guide strip, while ensuring the accuracy of the guide strip installation.

[0023] A further feature of this invention is that the cross-section of the guide groove is U-shaped, and the connection between the groove wall, the bottom of the groove and the top of the groove is provided with an arc-shaped transition section, and the inner wall of the guide groove is provided with a wear-resistant and lubricating coating, the coating material being polytetrafluoroethylene.

[0024] By adopting the above technical solutions, the frictional resistance between the paper and the edge of the guide groove during the conveying process can be effectively reduced, avoiding wear or wrinkles on the paper edges. At the same time, the arc-shaped transition section can also provide a certain buffering protection for the paper, ensuring that the paper remains flat and smooth during the guiding process. The polytetrafluoroethylene coating has an extremely low coefficient of friction and excellent wear resistance, which can further reduce the frictional loss between the paper and the inner wall of the guide groove, extend the service life of the guide strip, and reduce paper scraps and static electricity generated by friction, ensuring the cleanliness and stability of the paper conveying process. In addition, the polytetrafluoroethylene coating also has good high temperature resistance and corrosion resistance, which can adapt to the temperature changes and slight chemical corrosion that may occur in the working environment of the paper roll machine, ensuring that the guide groove maintains a good service condition for a long time.

[0025] A further feature of this invention is that: both sides of the dual-axis motor are fixedly equipped with elastic telescopic dust covers centered on the lead screw, and the ends of the two elastic telescopic dust covers that are far apart from each other are respectively fixedly connected to the corresponding mounting brackets.

[0026] By adopting the above technical solution, a shielding and protective effect can be provided for the part of the two lead screws located between the two mounting brackets.

[0027] The beneficial effects of this utility model are:

[0028] The lateral spacing of the guide bars on both sides can be easily adjusted by the spacing adjustment component, which can well adapt to the guiding needs of paper of different widths. At the same time, the lifting adjustment component, together with the transmission component, can realize the synchronous lifting of the sliding seat, which can quickly switch the guide bars of different heights to meet the limit guidance of diverse paper specifications, effectively improving the adaptability of the equipment to different production scenarios.

[0029] The guide plate and the convex opening provide stable support and guidance for the mounting frame. At the same time, the setting of guide rod one and guide rod two enhances the stability of the lateral adjustment of the mounting frame and the lifting adjustment of the sliding seat, respectively, ensuring precise and smooth operation of the mechanism. The guide bar adopts a detachable structure with a combination of slot and limit bar, which facilitates quick replacement and maintenance. In addition, the U-shaped design and arc transition section of the guide groove effectively reduce paper friction damage. The polytetrafluoroethylene coating on the inner wall of the guide groove further reduces friction loss, extends service life, and ensures clean and stable paper feeding. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a three-dimensional structural diagram of a convenient adjustable paper roll machine baffle mechanism proposed in this utility model;

[0032] Figure 2 for Figure 1 Front view structural diagram;

[0033] Figure 3 This is a partial three-dimensional structural schematic diagram of the present invention;

[0034] Figure 4 for Figure 3 A schematic diagram of a partial three-dimensional structure;

[0035] Figure 5 This is a structural schematic diagram of a portion of the guide plate, limiting plate, mounting frame, spacing adjustment assembly, and guide rod proposed in this utility model.

[0036] Figure 6 This is a schematic diagram of the structure of the guide strip, guide groove, and limiting strip proposed in this utility model;

[0037] Figure 7 This is a partial cross-sectional view of the frame proposed in this utility model.

[0038] In the diagram, 1 is the frame; 11 is the crossbeam; 2 is the mounting bracket; 201 is the guide plate; 202 is the limit plate; 21 is the lead screw; 22 is the dual-axis motor; 23 is the elastic telescopic dust cover; 24 is the guide rod; 3 is the mounting plate; 31 is the sliding seat; 311 is the guide rod; 32 is the lead screw; 33 is the telescopic shaft; 34 is the bevel gear; 35 is the adjusting motor; 4 is the guide bar; 401 is the guide groove; and 41 is the limit bar. Detailed Implementation

[0039] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. 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 based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0040] Reference Figure 1-7 An adjustable baffle mechanism for a paper roll machine includes a frame 1, two mounting brackets 2, two mounting plates 3, two sliding seats 31, a crossbeam 11, and multiple guide bars 4.

[0041] A crossbeam 11 is fixedly installed on the frame 1. Two mounting brackets 2 are slidably installed on the crossbeam 11. Two sliding seats 31 are slidably installed on the side of the two mounting brackets 2 that are close to each other. Two mounting plates 3 are fixedly installed on the side of the two sliding seats 31 that are close to each other. Multiple guide strips 4 can be detachably installed on the corresponding mounting plates 3. Multiple guide strips 4 are located on the side of the two mounting plates 3 that are close to each other. Multiple guide strips 4 are provided with guide grooves 401. The width of multiple guide grooves 401 close to the same mounting plate 3 decreases from top to bottom. The width of the guide groove 401 should be 5%-20% larger than the thickness of the paper it passes through, so as to reserve space for small deformation during paper feeding and avoid the paper edge being squeezed and deformed due to being too tight or shaking due to being too loose. In order to facilitate the disassembly and assembly of the guide strips 4 and ensure the installation accuracy of the guide strips 4, multiple slots are provided on the side of the two mounting plates 3 that are close to each other. Multiple guide strips 41 are fixedly installed on multiple guide strips 4. Multiple limit strips 41 are respectively snapped into the corresponding slots and fixedly connected by bolts.

[0042] In order to effectively reduce the frictional resistance between the paper and the edge of the guide groove 401 during the conveying process, avoid wear or wrinkles on the paper edge, and at the same time provide a certain buffer protection for the paper to ensure that the paper remains flat and smooth during the guiding process, the cross section of the guide groove 401 is U-shaped, and the connection between the groove wall, bottom and top of the guide groove 401 is provided with an arc-shaped transition section.

[0043] Meanwhile, the inner wall of the guide groove 401 is coated with a wear-resistant lubricating coating made of polytetrafluoroethylene (PTFE). This coating has an extremely low coefficient of friction and excellent wear resistance, which can further reduce the frictional loss between the paper and the inner wall of the guide groove 401, extend the service life of the guide strip 4, reduce paper scraps and static electricity generated by friction, and ensure the cleanliness and stability of the paper conveying process. In addition, the PTFE coating also has good high temperature resistance and corrosion resistance, which can adapt to the temperature changes and slight chemical corrosion that may occur in the working environment of the paper roll machine, ensuring that the guide groove 401 maintains a good working condition for a long time.

[0044] A dual-axis motor 22 is fixedly installed on the crossbeam 11. A lead screw 21 is axially fixedly connected to each of the two output shafts of the dual-axis motor 22. The threads of the two lead screws 21 face opposite directions, and the two lead screws 21 are respectively threaded to the mounting bracket 2 on the corresponding side. The distance between the two mounting brackets 2 can be adjusted as needed, thereby adjusting the distance between the guide strips 4 on both sides, which facilitates the limiting and guiding of paper of different sizes.

[0045] Two mounting brackets 2 are each rotatably mounted with a lead screw 32 threadedly connected to the corresponding sliding seat 31. The two lead screws 32 are arranged parallel to each other. An adjusting motor 35 is fixedly mounted on the top side of one of the mounting brackets 2. The output shaft of the adjusting motor 35 is axially fixedly connected to the corresponding lead screw 32, which can adjust the height of the sliding seat 31 when the lead screw 32 rotates. This allows guide bars 4 of different heights to be used to guide and limit the paper. The same telescopic shaft 33 is rotatably mounted on both mounting brackets 2. Both ends of the telescopic shaft 33 and the bottom ends of the two lead screws 32 are fixedly fitted with bevel gears 34. The two bevel gears 34 located on the same side mesh with each other, and the threads on the two lead screws 32 face opposite directions, which can realize the synchronous rotation of the two lead screws 32, thereby achieving the effect of controlling the synchronous lifting and lowering of the two sliding seats 31.

[0046] Specifically, in order to provide support and guidance for the mounting bracket 2 and limit its lateral displacement adjustment range, thereby maintaining good stability during lateral displacement adjustment, guide plates 201 are fixedly installed on the opposite sides of the two mounting brackets 2. Two convex openings are provided on the frame 1, and the two guide plates 201 are slidably installed in the corresponding convex openings. Limiting plates 202 are fixedly installed on the opposite sides of the two guide plates 201. Multiple guide rods 24 are fixedly installed on the frame 1 and are arranged parallel to the lead screw 21. The multiple guide rods 24 are slidably connected to the two mounting brackets 2.

[0047] Specifically, in order to provide a stable guide for the sliding seat 31 and thus maintain good stability during lifting and lowering adjustments, multiple vertically arranged guide rods 311 are fixedly installed on both mounting brackets 2, and the multiple guide rods 311 are slidably connected to the corresponding sliding seat 31.

[0048] To prevent debris from interfering with the lead screw 21, elastic telescopic dust covers 23 are fixedly installed on both sides of the dual-axis motor 22, with the lead screw 21 as the center. The ends of the two elastic telescopic dust covers 23 that are far apart from each other are fixedly connected to the mounting bracket 2 on the corresponding side. Similarly, if it is necessary to provide shielding protection for the lead screw 32, it can be set up in the same way (not shown in the figure).

[0049] It is also worth noting that, in order to ensure the accuracy of adjustment and the stability after adjustment, both the adjustment motor 35 and the dual-axis motor 22 are servo motors. The specific models can be selected and installed directly from the market by the technicians according to the actual needs.

[0050] In order to enable the paper to enter the corresponding guide groove 401 more efficiently, the guide groove 401 is set with a chamfered state that is inclined upward and downward at the end near the paper entry.

[0051] The circuits, electronic components, and module mechanisms involved all employ existing technologies, which can be fully implemented by those skilled in the art, and need no further explanation. The content protected by this application does not involve any improvement to the software, circuits, or methods.

[0052] Working principle: First, the power is turned on. When it is necessary to guide and limit paper of different widths, the dual-axis motor 22 is started. The two output shafts of the dual-axis motor 22 drive the two lead screws 21 to rotate synchronously. Since the threads of the two lead screws 21 are opposite and are threadedly connected to the corresponding mounting brackets 2, the two mounting brackets 2 will move closer or further away from each other along the crossbeam 11. At the same time, the mounting brackets 2 drive the guide plate 201 to slide in the convex opening. The guide rod 24 plays a guiding and stabilizing role in the movement of the mounting brackets 2 until the distance between the guide strips 4 on both sides matches the width of the paper. At this time, the dual-axis motor 22 stops working, and the adjustment of the horizontal distance is completed.

[0053] When it is necessary to switch the guide bar 4 to different heights to accommodate different paper sizes, the adjustment motor 35 is started. The output shaft of the adjustment motor 35 drives the corresponding lead screw 32 to rotate. The lead screw 32 meshes with the bevel gear 34 at one end of the telescopic shaft 33 through the bevel gear 34, thereby driving the telescopic shaft 33 to rotate. The bevel gear 34 at the other end of the telescopic shaft 33 meshes with the bevel gear 34 at the bottom of another lead screw 32, thereby driving the other lead screw 32 to rotate synchronously. Since the threads of the two lead screws 32 are facing opposite directions and are threadedly connected to the corresponding sliding seats 31, the two sliding seats 31 will rise or fall synchronously along the guide rod 311 on the mounting frame 2. The sliding seats 31 drive the mounting plate 3 and the guide bar 4 to rise and fall until the guide groove 401 of the required height corresponds to the paper conveying path. The adjustment motor 35 stops working, realizing the rapid switching of the height of the guide bar 4.

[0054] During paper feeding, the paper edge is embedded in the guide groove 401. The U-shaped guide groove 401 limits the paper position, and the arc-shaped transition section avoids the paper edge from contacting the groove wall corners, thus preventing wear or wrinkles. The polytetrafluoroethylene coating reduces friction between the paper and the groove wall, reducing paper dust generation and static electricity accumulation, ensuring smooth and clean paper feeding. When the guide strip 4 is worn or a guide groove 401 of a different specification needs to be replaced, the bolts fixing the limiting strip 41 are unscrewed, and the limiting strip 41 is removed from the slot to replace the new guide strip 4. During installation, simply insert the limiting strip 41 of the new guide strip 4 into the slot and tighten the bolts. The operation is convenient and can effectively shorten maintenance time.

[0055] The above provides a detailed description of the adjustable baffle mechanism for a paper winding machine provided by this utility model. Specific embodiments have been used to illustrate the principle and implementation of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A conveniently adjustable paper roll blocking mechanism, characterized in that, It includes a frame (1), two mounting brackets (2), a spacing adjustment assembly, two mounting plates (3), two sliding seats (31), a crossbeam (11), a lifting adjustment assembly, a transmission assembly, and multiple guide bars (4); The crossbeam (11) is fixedly installed on the frame (1), and the two mounting brackets (2) are slidably installed on the crossbeam (11). The two sliding seats (31) are slidably installed on the side of the two mounting brackets (2) that are close to each other. The two mounting plates (3) are fixedly installed on the side of the two sliding seats (31) that are close to each other. Multiple guide strips (4) can be detachably installed on the corresponding mounting plates (3). The multiple guide strips (4) are located on the side of the two mounting plates (3) that are close to each other. The multiple guide strips (4) are provided with guide grooves (401). The width of the multiple guide grooves (401) close to the same mounting plate (3) decreases from top to bottom. The spacing adjustment component is mounted on the frame (1) and the crossbeam (11) and connected to the two mounting brackets (2). The lifting adjustment component is mounted on the two mounting brackets (2) and connected to the two sliding seats (31). The transmission component is mounted on the two mounting brackets (2) and connected to the lifting adjustment component. An adjustment motor (35) is fixedly mounted on the top side of one of the mounting brackets (2), and the output shaft of the adjustment motor (35) is connected to the lifting adjustment component.

2. A conveniently adjustable paper roll blocking mechanism according to claim 1, characterized in that: The spacing adjustment assembly includes a dual-axis motor (22) and two lead screws (21). The dual-axis motor (22) is fixedly installed on the crossbeam (11). The two output shafts of the dual-axis motor (22) are axially fixedly connected to the lead screws (21). The threads of the two lead screws (21) are opposite, and the two lead screws (21) are threadedly connected to the mounting brackets (2) on the corresponding side.

3. A conveniently adjustable paper roll blocking mechanism according to claim 1, characterized in that: The lifting adjustment assembly includes two lead screws (32). Each of the two mounting brackets (2) is rotatably mounted with a lead screw (32) that is threadedly connected to the corresponding sliding seat (31). The two lead screws (32) are arranged parallel to each other. The output shaft of the adjustment motor (35) is axially fixedly connected to the corresponding lead screw (32).

4. A conveniently adjustable paper roll blocking mechanism according to claim 3, characterized in that: The transmission assembly includes a telescopic shaft (33) and four bevel gears (34). The same telescopic shaft (33) is rotatably mounted on two mounting brackets (2). Both ends of the telescopic shaft (33) and the bottom ends of the two lead screws (32) are fixedly fitted with bevel gears (34). The two bevel gears (34) located on the same side mesh with each other, and the threads on the two lead screws (32) face opposite directions.

5. A conveniently adjustable paper roll blocking mechanism according to claim 1, characterized in that: Guide plates (201) are fixedly installed on the opposite sides of the two mounting brackets (2). Two convex openings are opened on the frame (1). The two guide plates (201) are slidably installed in the corresponding convex openings. Limit plates (202) are fixedly installed on the opposite sides of the two guide plates (201).

6. A conveniently adjustable paper roll blocking mechanism according to claim 2, characterized in that: Multiple guide rods (24) are fixedly installed on the frame (1) and are arranged parallel to each other with the lead screw (21). The multiple guide rods (24) are slidably connected to the two mounting brackets (2).

7. A conveniently adjustable paper roll blocking mechanism according to claim 1, characterized in that: Multiple vertically arranged guide rods (311) are fixedly installed on both mounting brackets (2), and the multiple guide rods (311) are slidably connected to the corresponding sliding seats (31).

8. A conveniently adjustable paper roll blocking mechanism according to claim 1, characterized in that: Multiple slots are provided on the side of the two mounting plates (3) that are close to each other. Limiting strips (41) are fixedly installed on multiple guide strips (4). The multiple limiting strips (41) are respectively snapped into the corresponding slots and fixedly connected by bolts.

9. A conveniently adjustable paper roll blocking mechanism according to claim 1, characterized in that: The guide groove (401) has a U-shaped cross section, and the connection between the groove wall, the bottom and the top of the guide groove (401) is provided with an arc-shaped transition section. The inner wall of the guide groove (401) is provided with a wear-resistant lubricating coating, and the coating material is polytetrafluoroethylene.

10. A conveniently adjustable paper roll blocking mechanism according to claim 2, characterized in that: Both sides of the dual-axis motor (22) are fixedly installed with elastic telescopic dust covers (23) centered on the lead screw (21). The ends of the two elastic telescopic dust covers (23) that are far apart from each other are fixedly connected to the corresponding mounting brackets (2).

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