A camera cleaning device driven by wind energy in a coal mine underground

Abstract

The application provides a camera cleaning device driven by wind energy in a coal mine underground, and belongs to the field of camera cleaning. The device comprises a protective shell, a wind energy collection structure, a first kinetic energy transmission structure, an energy storage structure, a second kinetic energy transmission structure and a cleaning structure. The protective shell is fixedly arranged at the bottom of the camera. The wind energy collection structure is rotatably arranged outside the protective shell. The first kinetic energy transmission structure is arranged inside the protective shell. The energy storage structure is used for intermittently storing and releasing the kinetic energy collected by the wind energy collection structure. The second kinetic energy transmission structure is used for intermittently releasing the kinetic energy stored in the energy storage structure. The cleaning brush of the cleaning structure is arranged outside the protective shell. The kinetic energy conversion unit of the cleaning structure is used for converting the kinetic energy into driving force for driving the cleaning brush to reciprocate, so as to drive the cleaning brush to perform wiping action. The device is independent of power, fully mechanized and meets the explosion-proof requirement, so as to improve the working efficiency in the coal mine underground and the service life of the camera.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of camera cleaning devices, and particularly relates to a coal mine underground wind energy driven camera cleaning device. BACKGROUND

[0002] In the coal mine underground working environment, as a key safety monitoring device, the running state of the camera directly affects the safety monitoring effect of the mine. However, the unique humid and dusty environment of the coal mine underground brings severe challenges to the normal work of the camera. The humidity of the underground environment, and the coal dust and fine particulate matter generated in the process of coal mining are easily attached to the surface of the camera, causing the camera lens to be covered, the image to become blurred, and the clarity and real-time of the monitoring picture to be seriously affected.

[0003] At present, the cleaning method for camera lens pollution mainly relies on manual operation. This method is not only low in efficiency, but also has significant safety hazards. On the one hand, manual cleaning needs to frequently enter the underground, which greatly increases the labor intensity and safety risk of workers; on the other hand, manual operation cannot guarantee the timeliness and thoroughness of cleaning, and the cleaning effect is often unsatisfactory.

[0004] In addition, the existing camera cleaning devices on the market mostly use power as the driving source. Considering the special environment of the coal mine underground, any new equipment or system must meet strict explosion-proof requirements. Although the traditional power-driven cleaning device can improve the cleaning efficiency to a certain extent, it has potential explosion risk in the underground environment and is not suitable for use.

[0005] In summary, the existing coal mine underground camera cleaning method has many deficiencies. It is urgent to develop a new type of cleaning device that can effectively clean the camera lens and ensure safety, efficiency and automation.

[0006] Therefore, it is necessary to provide an improved technical solution to overcome the above deficiencies of the prior art. SUMMARY

[0007] The purpose of the present application is to provide a coal mine underground wind energy driven camera cleaning device. The device of the present application is not dependent on power, is completely mechanized, and meets the explosion-proof requirements, so as to improve the working efficiency of the coal mine underground and the service life of the camera.

[0008] In order to achieve the above purpose, the coal mine underground wind energy driven camera cleaning device of the present application provides the following technical solution:

[0009] A coal mine underground wind energy driven camera cleaning device, comprising:

[0010] A protective shell for fixing a camera at the bottom of the camera;

[0011] The wind energy collecting structure is rotationally arranged outside the protective shell;

[0012] The first kinetic energy transmission structure is arranged inside the protective shell and is used for transmitting the kinetic energy collected by the wind energy collecting structure rearward;

[0013] The energy storage structure is arranged at the rear side of the first kinetic energy transmission structure and is used for intermittently storing and releasing the kinetic energy collected by the wind energy collecting structure;

[0014] The second kinetic energy transmission structure is arranged at one side of the energy storage structure and is used for intermittently releasing the kinetic energy stored by the energy storage structure;

[0015] The cleaning structure comprises a kinetic energy conversion unit and a cleaning brush, the cleaning brush is arranged outside the protective shell and is used for wiping the camera, and the kinetic energy conversion unit is used for converting the kinetic energy transmitted by the second kinetic energy transmission structure into driving force for driving the cleaning brush to reciprocate, so as to drive the cleaning brush to perform wiping action.

[0016] As a further optimized technical solution, the wind energy collecting structure comprises a transmission shaft, the transmission shaft is rotationally matched with the protective shell, and the end of the transmission shaft partially extending out of the protective shell is circumferentially arranged with blades, the blades are driven by airflow to drive the transmission shaft to rotate.

[0017] As a further optimized technical solution, the end of the transmission shaft extending into the protective shell is fixedly arranged with a first gear, a second gear is rotationally arranged at one side of the first gear, the first gear and the second gear are in meshing transmission, the number of teeth of the first gear is greater than that of the second gear, and the first gear and the second gear constitute the first kinetic energy transmission structure.

[0018] As a further optimized technical solution, the energy storage structure comprises a clockwork and a transmission component, the transmission component is used for intermittently meshing transmission with the second gear, one end of the clockwork is fixedly connected with the transmission component, the other end is fixedly connected with the inner side wall of the protective shell, and the transmission component rotationally drives the clockwork to contract to realize energy storage.

[0019] As a further optimized technical solution, the transmission component comprises:

[0020] The fixed base is fixedly arranged inside the protective shell;

[0021] The sliding shaft is arranged on the fixed base and is movably connected with the fixed base;

[0022] The transmission gear set is fixedly arranged on the sliding shaft;

[0023] An elastic reset member is arranged at one end of the sliding shaft, one end of the elastic reset member is rotatably connected with the sliding shaft, and the other end is fixedly connected with the inner side wall of the protective shell.

[0024] One end of the clockwork is fixedly connected with the gear set, and the other end is fixedly connected with the protective shell at a position deviated from the driving gear set by a set distance towards the cleaning brush.

[0025] As a further optimized technical solution, the driving gear set comprises a first driving gear and a second driving gear, the first driving gear is used for meshing transmission with the second gear, and the number of teeth of the first driving gear is less than that of the second driving gear.

[0026] As a further optimized technical solution, the second kinetic energy transmission structure comprises an output gear, and the output gear is meshed with the second driving gear.

[0027] As a further optimized technical solution, the kinetic energy conversion unit comprises:

[0028] An output shaft is rotatably arranged in the protective shell, and the output gear is fixedly arranged at one end of the output shaft.

[0029] A crank is fixedly connected with the output shaft at one end away from the other end of the output shaft;

[0030] A connecting rod is hingedly connected with the crank at one end away from the other end of the output shaft;

[0031] A sliding block is hingedly connected with the connecting rod at one end away from the hinged crank;

[0032] A slide is fixedly arranged in the protective shell, the sliding block is in sliding fit with the slide, and the length extension direction of the slide is parallel to the width direction of the camera;

[0033] The rotation of the output gear drives the crank and the connecting rod to act, and finally drives the sliding block to reciprocatingly slide along the slide, and the brush handle of the cleaning brush is fixedly arranged on the sliding block.

[0034] As a further optimized technical solution, a stop component is arranged on the sliding shaft to limit the sliding distance of the sliding shaft relative to the fixed base.

[0035] As a further optimized technical solution, the stop component comprises two stop rings fixedly arranged on the sliding shaft, and the two stop rings are arranged on both sides of the fixed base.

[0036] Beneficial effects:

[0037] High safety: The device does not rely on electric power driving, completely adopts mechanical structure, avoids the explosion risk that may be caused by using electric power equipment in coal mine underground, meets the strict anti-explosion requirements in coal mine underground, and greatly improves the safety of underground operation.

[0038] High efficiency and automation: The wind energy in the underground is converted into kinetic energy through the wind energy collection structure, and is stored and intermittently released by the energy storage structure, finally driving the cleaning brush to automatically clean the camera, without frequent manual intervention, improving the timeliness and thoroughness of cleaning, and effectively improving the work efficiency.

[0039] Prolong the service life of the camera: It can timely remove the coal dust and fine particles attached to the surface of the camera, keep the camera lens clean, ensure the clarity and real-time of the monitoring picture, thereby prolonging the service life of the camera and reducing the replacement cost of the equipment.

[0040] Compact and reasonable structure: The layout of each component is compact, and through the ingenious gear transmission, energy storage and kinetic energy conversion structure, the effective conversion of wind energy to cleaning power is realized, and the overall structure is simple and reliable, easy to install and maintain. BRIEF DESCRIPTION OF DRAWINGS

[0041] The drawings accompanying the specification of this application form a part of the disclosure of the application and serve to further provide a further understanding of the application, the illustrative embodiments of the application and its description serve to explain the application without imposing undue limitations on the application. Among them:

[0042] Figure 1 It is the overall structure schematic diagram of an embodiment of the application;

[0043] Figure 2 It is the schematic diagram of all structures in the protective shell of an embodiment of the application;

[0044] Figure 3 It is Figure 2 the side view schematic diagram along the A direction;

[0045] Figure 4 It is Figure 2 the top view schematic diagram along the B direction.

[0046] In the drawings: 1, protective shell; 2, camera; 3, cleaning brush; 4, transmission shaft; 5, blade; 6, first gear; 7, second gear; 8, clockwork; 9, fixed base; 10, sliding shaft; 11, elastic return member; 12, first transmission gear; 13, second transmission gear; 14, output gear; 15, output shaft; 16, crank; 17, connecting rod; 18, sliding block; 19, slide; 20, stop ring; 21, bearing; 22, support base. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0048] In the description of the present application, the orientations or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application, and are not required to be the specific orientations and operations of the present application, and therefore cannot be understood as limitations on the present application. The terms "connected", "connected" used in the present application should be interpreted broadly, for example, can be fixed connection, can also be detachable connection; can be directly connected, can also be indirectly connected through intermediate components. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0049] The present application will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0050] The shapes and sizes of the components in the drawings do not reflect the true proportions of the product, but only serve to illustrate the content of the present application.

[0051] Embodiment 1

[0052] As shown in Figures 1-4 The present application provides a kind of coal mine underground wind energy driven camera cleaning device, including protective shell 1, wind energy collection structure, first kinetic energy transmission structure, energy storage structure, second kinetic energy transmission structure and cleaning structure.

[0053] Protective shell 1 is fixedly arranged at the bottom of camera 2 by bonding, welding, magnetic attraction, screwing or other common fixing methods, to provide installation basis for the whole device.

[0054] Wind energy collection structure is rotationally arranged outside protective shell 1, which converts wind energy into rotational kinetic energy. Specifically, the structure includes a transmission shaft 4, which is rotationally connected with the side wall of protective shell 1, and the end of transmission shaft 4 partially protruding from protective shell 1 is arranged with blades 5 in the circumferential direction. When the blades 5 are driven by the airflow, the transmission shaft 4 will be rotated.

[0055] The first kinetic energy transmission structure is arranged inside the protective shell 1 and is used for transmitting the kinetic energy collected by the wind energy collecting structure. The structure is composed of a first gear 6 fixedly arranged at one end of the transmission shaft 4 extending into the protective shell 1 and a second gear 7 rotatably arranged at one side of the first gear 6. The first gear 6 is in meshing transmission with the second gear 7, and the number of teeth of the first gear 6 is greater than that of the second gear 7. The transmission of kinetic energy and speed-up are realized through the gear transmission mode.

[0056] The energy storage structure is arranged at the rear side of the first kinetic energy transmission structure and is used for intermittently storing and releasing the kinetic energy collected by the wind energy collecting structure. The energy storage structure includes a clockwork 8 and a transmission component. The transmission component is used for intermittently meshing transmission with the second gear 7. One end of the clockwork 8 is fixedly connected with the transmission component, and the other end is fixedly connected with the inner side wall of the protective shell 1. When the transmission component rotates, the clockwork 8 is driven to contract, so that the energy storage (i.e. the kinetic energy is converted into elastic potential energy) is realized. The transmission component further includes a fixed base 9, a sliding shaft 10, a transmission gear set, and an elastic reset member 11. The fixed base 9 is fixedly arranged inside the protective shell 1. The sliding shaft 10 is arranged on the fixed base 9 and is movably connected with the fixed base 9. The transmission gear set is fixedly arranged on the sliding shaft 10. The elastic reset member 11 is arranged at one end of the sliding shaft 10, is rotatably connected with the sliding shaft 10 at one end, and is fixedly connected with the inner side wall of the protective shell 1 at the other end. One end of the clockwork 8 is fixedly connected with the gear set, and the other end is arranged at a distance away from the gear set in the direction close to the cleaning brush 3. In this way, when the clockwork 8 contracts to a certain extent, the sliding shaft 10 is pulled to move in the direction close to the cleaning brush 3. At this time, the transmission gear set is disconnected from the second gear 7, and the transmission gear set is connected with the second kinetic energy transmission structure to release the kinetic energy collected by the clockwork 8 in the contraction process. When the kinetic energy is released, the elastic reset member 11 drives the sliding shaft 10 to reset. At this time, the energy storage structure is disconnected from the second kinetic energy transmission structure and continues to store energy.

[0057] In the embodiment, the elastic reset member 11 is a spiral spring. The spiral spring is rotatably arranged at the end of the sliding shaft 10 away from the cleaning brush 3 through a bearing 21. At this time, one end of the spiral spring is connected with the bearing 21, and the other end is fixedly connected with the inner side wall of the protective shell 1. In the rotation process of the sliding shaft 10, the spiral spring is not twisted due to the existence of the bearing 21. In the contraction process of the clockwork 8, when the deformation force is greater than the pulling force of the spiral spring, the sliding shaft 10 is pulled to move away from the end of the spiral spring. After the clockwork 8 releases the kinetic energy, the deformation force decreases. At this time, the spiral spring pulls the sliding shaft 10 to slide to the end close to the spiral spring.

[0058] The transmission gear set includes a first transmission gear 12 and a second transmission gear 13. The first transmission gear 12 is used for meshing transmission with the second gear 7. The number of teeth of the first transmission gear 12 is less than that of the second transmission gear 13, so that the speed-up and transmission of kinetic energy are further realized.

[0059] The second kinetic energy transmission structure is arranged on one side of the energy storage structure, and is used for intermittently releasing the kinetic energy stored in the energy storage structure. The structure comprises an output gear 14, which is engaged with the second transmission gear 13 to transmit the kinetic energy released by the clockwork 8.

[0060] The cleaning structure comprises a kinetic energy conversion unit and the cleaning brush 3. The cleaning brush 3 is arranged outside the protective shell 1 and is used for wiping the camera 2. The material of the cleaning brush 3 is selected to be soft and wear-resistant, such as microfiber or specially treated nylon, so as to effectively remove dust and soot and protect the lens surface from being damaged.

[0061] The kinetic energy conversion unit is used for converting the kinetic energy transmitted by the second kinetic energy transmission structure into driving force for driving the cleaning brush 3 to reciprocate, so as to drive the cleaning brush 3 to perform the wiping action.

[0062] The specific kinetic energy conversion unit comprises an output shaft 15, a crank 16, a connecting rod 17, a sliding block 18, a sliding track 19 and the output gear 14.

[0063] The output shaft 15 is rotatably arranged in the protective shell 1 through a supporting base 22, and the output gear 14 is fixedly arranged at one end of the output shaft 15.

[0064] One end of the crank 16 is fixedly connected with the end of the output shaft 15 away from the output gear 14, and the crank 16 and the output shaft 15 form an L-shaped crank arm shape. One end of the connecting rod 17 is hingedly connected with the end of the crank 16 away from the output shaft 15, and the other end is hingedly connected with the sliding block 18. The sliding track 19 is fixedly arranged in the protective shell 1, the sliding block 18 is in sliding fit with the sliding track 19, and the length extension direction of the sliding track 19 is parallel to the width direction of the camera 2. The brush handle of the cleaning brush 3 is fixedly arranged on the sliding block 18.

[0065] In this way, the output shaft 15, the crank 16, the connecting rod 17, the sliding block 18 and the sliding track 19 jointly form a crank and sliding block structure. The output gear 14 rotates to drive the output shaft 15 to rotate, and the rotation of the output shaft 15 is converted into the reciprocating sliding of the sliding block 18 along the sliding track 19, so that the brush head of the cleaning brush 3 can stably reciprocate to wipe the camera 2.

[0066] Further, in order to ensure that the sliding degree of the sliding shaft 10 during the sliding process meets the requirements, a stop component is arranged on the sliding shaft 10, which is used for limiting the relative sliding distance between the sliding shaft 10 and the fixed base 9.

[0067] In the embodiment, the stop component includes two stop rings 20 fixedly arranged on the sliding shaft 10, which are arranged on both sides of the fixed base 9. When the spring 8 is deformed after contraction, the sliding shaft 10 is pulled to slide to the end close to the cleaning brush 3. During the sliding process, the stop ring 20 on the side of the sliding shaft 10 close to the spiral spring collides with the fixed base 9 to stop the sliding. At this time, the second transmission gear 13 is just engaged with the output gear 14, and the first transmission gear 12 is disengaged from the second gear 7. When the spring 8 releases the kinetic energy, the spiral spring pulls the sliding shaft 10 to slide away from the cleaning brush 3. During the sliding process, the stop ring 20 on the side of the sliding shaft 10 away from the spiral spring collides with the fixed base 9 to stop the sliding. At this time, the second transmission gear 13 is just disengaged from the output gear 14, and the first transmission gear 12 is engaged with the second gear 7.

[0068] It should be noted that, considering that the transmission structure in the device has relatively low requirements for transmission accuracy and load, all the gears are made of plastic material. The gears made of plastic material are lighter in quality and smaller in inertia, which makes them more smoothly realize transmission when changing positions with the sliding shaft 10.

[0069] The working principle of the present application is as follows:

[0070] When there is airflow flowing underground, the wind energy collecting structure starts to work. The airflow drives the blade 5 to rotate, the blade 5 drives the transmission shaft 4 to rotate, and then the first gear 6 rotates. Since the first gear 6 is engaged with the second gear 7, and the number of teeth of the first gear 6 is greater than that of the second gear 7, the second gear 7 will rotate at a higher speed to realize speed-up transmission of kinetic energy.

[0071] With the rotation of the second gear 7, when the first transmission gear 12 in the transmission component is engaged with the second gear 7, it will drive the transmission gear set on the sliding shaft 10 to rotate, and then drive the spring 8 to contract to store the kinetic energy as elastic potential energy. In this process, the spring 8 gradually deforms with contraction. When it contracts to a certain extent, it will pull the sliding shaft 10 to move to the end close to the cleaning brush 3. After moving, the first transmission gear 12 is disengaged from the second gear 7, and the second transmission gear 13 is just engaged with the output gear 14. At this time, the spring 8 starts to release the stored elastic potential energy, drives the second transmission gear 13 to rotate, and the second transmission gear 13 transmits the kinetic energy to the output shaft 15 through engagement with the output gear 14. The rotation of the output shaft 15 drives the crank 16 to make circular motion, and the crank 16 drives the sliding block 18 to make reciprocating sliding in the slide 19 through the connecting rod 17, so as to make the cleaning brush 3 fixed on the sliding block 18 wipe the lens of the camera 2.

[0072] When the deforming force is less than the pulling force of the helical spring during the process of releasing the stored elastic potential energy of the clockwork 8, the helical spring pulls the sliding shaft 10 to move away from one end of the cleaning brush 3. After the movement, the second transmission gear 13 is just disengaged from the output gear 14, the first transmission gear 12 is engaged with the second gear 7, and then the clockwork 8 restores to continue the energy storage state.

[0073] It can be understood that the above description is only exemplary, and the embodiments of the present application do not limit this.

[0074] The above only the preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, are within the scope of the claims of the present application.

Claims

1. A coal mine underground wind energy driven camera cleaning device, characterized in that, Include: Protective shell (1), the protective shell (1) is used for fixedly arranged at the bottom of the camera (2); Wind energy collection structure, the wind energy collection structure is rotatably arranged outside the protective shell (1); First kinetic energy transmission structure, the first kinetic energy transmission structure is arranged inside the protective shell (1), for transmitting the kinetic energy collected by the wind energy collection structure to the back; Energy storage structure, the energy storage structure is arranged at the back side of the first kinetic energy transmission structure, for intermittently storing and releasing the kinetic energy collected by the wind energy collection structure; Second kinetic energy transmission structure, the second kinetic energy transmission structure is arranged on one side of the energy storage structure, for intermittently releasing the kinetic energy stored in the energy storage structure; Cleaning structure, the cleaning structure includes a kinetic energy conversion unit and a cleaning brush (3), the cleaning brush (3) is arranged outside the protective shell (1) and is used for wiping the camera (2), and the kinetic energy conversion unit is used for converting the kinetic energy transmitted by the second kinetic energy transmission structure into driving force for driving the reciprocating motion of the cleaning brush (3), so as to drive the cleaning brush (3) to perform wiping action; The wind energy collection structure includes a transmission shaft (4), the transmission shaft (4) is rotatably connected with the protective shell (1), one end of the transmission shaft (4) partially protruding from the protective shell (1) is circumferentially arranged with a blade (5), and the blade (5) is driven by the airflow to drive the transmission shaft (4) to rotate; The one end of the transmission shaft (4) protruding into the protective shell (1) is fixedly provided with a first gear (6), one side of the first gear (6) is rotatably provided with a second gear (7), the first gear (6) is in meshing transmission with the second gear (7), the number of teeth of the first gear (6) is greater than the number of teeth of the second gear (7), and the first gear (6) and the second gear (7) constitute the first kinetic energy transmission structure; The energy storage structure includes a clockwork spring (8) and a transmission member, the transmission member is used for intermittently meshing transmission with the second gear (7), one end of the clockwork spring (8) is fixedly connected with the transmission member, the other end is fixedly connected with the inner side wall of the protective shell (1), and the transmission member rotatably drives the clockwork spring (8) to contract to realize energy storage; The transmission member includes: A fixed base (9) is fixedly arranged inside the protective shell (1); A sliding shaft (10) is arranged on the fixed base (9) and is movably connected with the fixed base (9); A transmission gear set is fixedly arranged on the sliding shaft (10); An elastic reset member (11) is arranged on one end of the sliding shaft (10), one end of the elastic reset member (11) is rotatably connected with the sliding shaft (10), and the other end is fixedly connected with the inner side wall of the protective shell (1); One end of the clockwork spring (8) is fixedly connected with the gear set, and the other end is deviated from the transmission gear set by a distance in the direction close to the cleaning brush (3); The transmission gear set includes a first transmission gear (12) and a second transmission gear (13), the first transmission gear (12) is used for meshing transmission with the second gear (7), and the number of teeth of the first transmission gear (12) is less than the number of teeth of the second transmission gear (13); The second kinetic energy transmission structure comprises an output gear (14) which is in meshing transmission with the second transmission gear (13).

2. The coal mine camera cleaning device driven by wind energy in underground mine according to claim 1, characterized in that, The kinetic energy conversion unit comprises: an output shaft (15) which is rotatably arranged in the protective shell (1), and the output gear (14) is fixedly arranged at one end of the output shaft (15); a crank (16) which is fixedly connected with the output shaft (15) at one end away from the output gear (14); a connecting rod (17) which is hingedly connected with the crank (16) at one end away from the output shaft (15); a sliding block (18) which is hingedly connected with the connecting rod (17) at one end away from the hinged crank (16); a slide (19) which is fixedly arranged in the protective shell (1), and the sliding block (18) is in sliding cooperation with the slide (19), and the length extension direction of the slide (19) is parallel to the width direction of the camera (2); the rotation of the output gear (14) drives the crank (16) and the connecting rod (17) to move, and finally drives the sliding block (18) to reciprocatingly slide along the slide (19), and the brush handle of the cleaning brush (3) is fixedly arranged on the sliding block (18).

3. The coal mine camera cleaning device driven by wind energy in underground mine according to claim 1, characterized in that, The sliding shaft (10) is provided with a stop component for limiting the sliding distance of the sliding shaft (10) relative to the fixed base (9).

4. The coal mine camera cleaning device driven by wind energy in underground mine according to claim 3, characterized in that, The stop component comprises two stop rings (20) which are fixedly arranged on the sliding shaft (10) and are arranged on both sides of the fixed base (9).

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