Surface heat treatment device for crankshaft machining

Abstract

According to the surface heat treatment device for crankshaft machining, the liquid level is lowered by lowering the baffle, so that surface cleaning liquid naturally flows into the filter box, an oil film floating on the surface layer is taken away in time, secondary pollution of a crankshaft in the process of entering and exiting an ultrasonic cleaning box can be effectively avoided, and the service life of the crankshaft is prolonged. Oil is adsorbed and filtered through the oil absorption piece, desorption and oil removal can be conducted on the oil absorption piece through the magnetic repulsion effect, and therefore the oil absorption effect of the oil absorption piece is effectively improved, in addition, the impurity removal piece is arranged at the bottom of the ultrasonic cleaning box, oil sludge and oxide skin are removed online through the alternate blocking effect of the impurity removal piece, and the oil absorption efficiency is improved. And the trouble of manual regular cleaning is saved, so that the cleaning efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to a surface heat treatment device for crankshaft machining, and in particular to a surface heat treatment device for crankshaft machining applied in the field of crankshaft machining. Background Art

[0002] The crankshaft is the most important component in the engine. It receives the force from the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine to work.

[0003] The crankshaft needs to be quenched during the processing process, and the crankshaft must be cleaned after quenching. This is an indispensable key link in the heat treatment process. The purpose is to clean off the sludge and oxide scale on it. For example, an ultrasonic cleaning machine for automobile engine crankshafts with publication number CN216827597U discloses a technical solution for ultrasonic cleaning of the crankshaft. However, in the existing cleaning device, a layer of oil film will float on the liquid surface of the freshener after a long period of cleaning. In the process of the crankshaft entering and exiting the cleaning box, the oil film will adhere to the surface of the crankshaft, causing secondary contamination of the crankshaft. Therefore, the patent for a water bath crankshaft blank degreasing circulation cleaning device with publication number CN205032432U in the prior art discloses a solution for removing the oil film on the liquid surface by overflow.

[0004] However, the overflow method requires continuous addition of new cleaning fluid, which consumes a lot of energy. Furthermore, the new fluid primarily remains on the surface, leaving insufficient deep-layer replacement. Over time, the sludge and scale deposited at the bottom of the tank significantly reduce cleaning effectiveness. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to clean up the oil film floating on the liquid surface in time to prevent it from causing secondary contamination to the crankshaft.

[0006] In order to solve the above problems, the present invention provides a surface heat treatment device for crankshaft processing, comprising an ultrasonic cleaning box, a slide groove is provided on the upper side wall of the ultrasonic cleaning box, and an electric lifting column is installed at the bottom of the slide groove, the upper end of the electric lifting column is fixedly connected to a baffle which is sealingly and slidingly connected to the slide groove, and a liquid level sensor is installed on the middle side wall of the baffle, the side of the ultrasonic cleaning box is fixedly connected to a filter box, and an oil suction piece is installed inside the filter box, the lower end of the filter box is connected to a liquid return pipe, and the bottom of the ultrasonic cleaning box is fixedly connected to a liquid outlet pipe connected to the liquid return pipe, a pressure pump is installed on the liquid return pipe, a plurality of nozzles distributed in an array are provided on the side wall of the liquid outlet pipe, and the plurality of nozzles are all directed towards the middle of the ultrasonic cleaning box, the side wall of the filter box is also fixedly connected to an oil storage tank, and the oil storage tank is connected to the oil suction piece;

[0007] The oil absorption component includes a frame fixedly connected to the inner wall of the filter box, a plurality of magnetic extrusion plates arranged near the inner wall of the frame, an oil absorption pad filled in the middle of the frame, an oil removal port opened on the outer wall of the frame and connected to the oil storage tank, and a plurality of pairs of closable electro-sealed bottom plates fixedly connected to the bottom of the frame.

[0008] In the above-mentioned surface heat treatment device for crankshaft processing, the liquid level is lowered by raising and lowering the baffle before the crankshaft enters and exits the cleaning box, allowing the cleaning liquid to flow naturally into the filter box, thereby taking away the oil film floating on the liquid surface, avoiding secondary contamination of the crankshaft, and the oil suction part filters the cleaning liquid and then replenishes it into the cleaning box from the bottom. After repeated cycles, the bottom cleaning liquid can be replaced, thereby effectively improving the cleaning effect.

[0009] As a further improvement of the present application, the magnetic extrusion plate is fixedly connected to the oil absorption pad, and the oil absorption pad is connected to the inner wall of the frame by an elastic band, and the side wall of the frame facing the oil storage tank is fixedly inlaid with an electromagnetic layer that repels the magnetic extrusion plate.

[0010] As a further improvement of the present application, the electrically sealed bottom plate is in a downwardly bent open state when the power is off, and is in a horizontally closed state when the power is on.

[0011] As a further improvement of the present application, a discharge pipe is fixedly connected to the middle part of the ultrasonic cleaning box, and a debris removal part is fixedly connected to the inside of the discharge pipe. The discharge pipe consists of a conical pipe at the top and a straight pipe at the bottom. The debris removal part includes a driving rod fixedly connected to the inner wall of the discharge pipe, and an upper blocking plate and a lower blocking plate fixedly connected to the upper and lower ends of the driving rod respectively. The upper blocking plate and the lower blocking plate have the same structure but different sizes.

[0012] As another improvement of the present application, the upper blocking disc and the lower blocking disc each include two symmetrically fixedly connected discs, a plurality of disc bones fixedly embedded in the inside of the discs, and a shaping belt connecting the plurality of disc bones in series.

[0013] As another improved supplement to the present application, one end of the upper blocking plate and the lower blocking plate are fixedly connected to the side wall of the driving rod, and the other ends of the upper blocking plate and the lower blocking plate are fixedly connected to the driven rod facing the driving rod, the upper and lower ends of the driving rod are fixedly embedded with fixed electromagnetic seats, and the inner wall of the driven rod is fixedly embedded with a dynamic electromagnetic seat that is adsorbed with the fixed electromagnetic seat.

[0014] As another improved supplement of the present application, the disc is made of polyurethane elastic material, the disc bone is made of elastic metal material, and the shaping belt is made of high elastic material.

[0015] As another improvement of the present application, a plurality of reset belts distributed around the two discs at equal intervals are fixedly connected between the two discs, and the reset belts are made of elastic material.

[0016] To sum up, by lowering the baffle to lower the liquid level, the surface cleaning liquid can flow naturally into the filter box, thereby taking away the oil film floating on the surface in time, which can effectively prevent the crankshaft from being contaminated again during the process of entering and exiting the ultrasonic cleaning box. The oil is adsorbed and filtered by the oil absorption part, and the oil absorption part can be desorbed and deoiled by magnetic repulsion, thereby effectively improving the oil absorption effect of the oil absorption part. In addition, by arranging a debris removal part at the bottom of the ultrasonic cleaning box, the alternating blocking effect of the debris removal part is used to remove sludge and oxide scale online, eliminating the trouble of manual regular cleaning, thereby effectively improving the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a top perspective view of the first embodiment of the present application;

[0018] Figure 2 This is a bottom perspective view of the first embodiment of the present application;

[0019] Figure 3 This is a front cross-sectional view of the first and second embodiments of the present application;

[0020] Figure 4 This is a top view of the oil absorption member according to the first embodiment of the present application;

[0021] Figure 5 This is a partial cross-sectional view of the oil absorption member of the first embodiment of the present application when filtering cleaning liquid and absorbing oil;

[0022] Figure 6 This is a partial cross-sectional view of the oil absorbing member according to the first embodiment of the present application when desorbing oil by extrusion;

[0023] Figure 7 This is a flowchart of the operation of removing the oil film on the surface of the liquid by raising and lowering the baffle in the first embodiment of the present application;

[0024] Figure 8 A perspective view of a debris removal component according to a second embodiment of the present application;

[0025] Figure 9 This is a front cross-sectional view of the debris removal component of the second embodiment of the present application before unloading;

[0026] Figure 10 This is a front cross-sectional view of the debris removal component of the second embodiment of the present application after unloading;

[0027] Figure 11 This is a three-dimensional exploded view of the blocking disc of the second embodiment of this application.

[0028] Description of the numbers in the figure:

[0029] 1 Ultrasonic cleaning box, 2 Electric lifting column, 3 Baffle, 4 Liquid level sensor, 5 Filter box, 6 Oil suction piece, 601 Frame, 602 Magnetic extrusion plate, 603 Oil suction pad, 604 De-oiling port, 605 Electro-sealed bottom plate, 7 Return liquid pipe, 8 Discharge pipe, 9 Pressure pump, 10 Oil storage tank, 11 Discharge pipe, 12 Discharge parts, 13 Driving rod, 1301 Fixed electromagnetic seat, 1302 Moving electromagnetic seat, 14 Upper blocking disc, 15 Lower blocking disc, 16 Disc plate, 17 Disc bone, 18 Shaping belt, 19 Reset belt, 20 Follower rod. DETAILED DESCRIPTION

[0030] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0031] The first implementation method:

[0032] like Figure 1 、 2 As shown in Figure 3, a surface heat treatment device for crankshaft processing includes an ultrasonic cleaning box 1, a chute is provided on the upper side wall of the ultrasonic cleaning box 1, and an electric lifting column 2 is installed at the bottom of the chute, the upper end of the electric lifting column 2 is fixedly connected to a baffle 3 that is sealed and slidably connected to the chute, and a liquid level sensor 4 is installed on the middle side wall of the baffle 3 (the specific model is selected according to actual needs), a filter box 5 is fixedly connected to the side of the ultrasonic cleaning box 1, and an oil suction part 6 is installed inside the filter box 5, the lower end of the filter box 5 is connected to a return liquid pipe 7, and the bottom of the ultrasonic cleaning box 1 is fixedly connected to a baffle 3 that is connected to the return liquid pipe 7. The liquid outlet pipe 8 and the return liquid pipe 7 are equipped with a pressure pump 9 (the specific model is selected according to actual needs). The side wall of the liquid outlet pipe 8 is provided with a plurality of nozzles distributed in an array, and the plurality of nozzles are all directed toward the middle of the ultrasonic cleaning box 1. The side wall of the filter box 5 is also fixedly connected to an oil storage tank 10, and the oil storage tank 10 is communicated with the oil suction member 6. In the process of cleaning the crankshaft in the prior art, the cleaned sludge will float on the liquid surface to form an oil film. In this way, the oil film will adhere to the surface of the crankshaft during the process of the crankshaft entering and exiting the ultrasonic cleaning box 1, causing secondary pollution. Therefore, the present embodiment cleans the oil film in time by setting a baffle 3, such as Figure 7 As shown, the specific operation process is:

[0033] S1. Before the crankshaft is placed in the ultrasonic cleaning tank 1, the liquid level is at the position of the liquid level sensor 4. First, start the electric lifting column 2 to lower the baffle 3 so that the baffle 3 is flush with the upper surface of the ultrasonic cleaning tank 1. At this time, the cleaning liquid that is higher than the ultrasonic cleaning tank 1 flows into the filter box 5. In this way, the oil film floating on the liquid surface can be taken away in time to prevent the oil film from adhering to the surface of the crankshaft and increasing the difficulty of cleaning. After the liquid level is flush with the upper surface of the ultrasonic cleaning tank 1, start the electric lifting column 2 to raise the baffle 3 back to its original height, and then put the crankshaft in. While cleaning the crankshaft, the oil suction part 6 filters the cleaning liquid and absorbs the oil therein, and then the pressure pump 9 transports the filtered cleaning liquid to the liquid outlet pipe 8 through the return pipe 7. The cleaning liquid is re-replenished to the ultrasonic cleaning tank 1 from the liquid outlet pipe 8 until the liquid level returns to the liquid level sensor 4 and the replenishment stops;

[0034] S2. When the crankshaft is cleaned and ready to be taken out, start the electric lifting column 2 to lower the baffle 3 to a position flush with the upper surface of the ultrasonic cleaning box 1 before taking it out. The subsequent operations are the same as the process in step S1, which is to discharge the oil film floating on the liquid surface into the filter box 5. After the liquid surface is flush with the upper surface of the ultrasonic cleaning box 1, the crankshaft can be taken out. After taking out the crankshaft, the baffle 3 is raised back to its original height, and then the pressure pump 9 is started to replenish the filtered cleaning liquid into the ultrasonic cleaning box 1. The subsequent operations are repeated in steps S1 and S2.

[0035] like Figure 4 、 5As shown in FIG6 , the oil absorbing member 6 includes a frame 601 fixedly connected to the inner wall of the filter box 5, a plurality of magnetic extrusion plates 602 arranged near the inner wall of the frame 601, an oil absorbing pad 603 filled in the middle of the frame 601 (preferably made of organic silicon polymer sponge material, but other materials can also be selected according to actual needs), an oil removal port 604 opened on the outer wall of the frame 601 and connected to the oil storage tank 10, and a plurality of pairs of closable electro-sealed bottom plates 605 (made of electrostrictive material) fixedly connected to the bottom of the frame 601. The plate 602 is fixedly connected to the oil absorbing pad 603, and the oil absorbing pad 603 is connected to the inner side wall of the frame 601 by an elastic band. The side wall of the frame 601 facing the oil storage tank 10 is fixedly inlaid with an electromagnetic layer (made of electromagnetic material) that repels the magnetic extrusion plate 602. The electro-sealed bottom plate 605 is in a downwardly bent open state when the power is off, and in a horizontally closed state when the power is on. After the cleaning liquid flows into the interior of the filter box 5, the oil absorbing pad 603 filters the oil in the cleaning liquid. At this time, the electro-sealed bottom plate 605 is in a power-off state. The filtered cleaning liquid falls to the bottom of the liquid return pipe 7 through the electro-sealed bottom plate 605. When the baffle 3 rises, no cleaning liquid flows into the filter box 5. Therefore, this gap time can be used to energize the electro-sealed bottom plate 605 and the electromagnetic layer on the frame 601. First, energize the electro-sealed bottom plate 605 to change it from a bent state to a straight state, thereby closing the lower end opening of the frame 601. Then, energize the electromagnetic layer to repel the magnetic extrusion plate 602. The magnetic extrusion plate 602 squeezes the oil absorbing pad 603 under the repulsive force, and absorbs the oil. The oil adsorbed in the oil pad 603 is desorbed under the squeezing force, and the oil enters the oil storage tank 10 from the de-oiling port 604 for storage, thereby realizing self-desorption and cleaning of the oil absorbing pad 603, so that the oil absorbing pad 603 can maintain a high oil absorption effect. When the desorption is completed, the electro-sealed bottom plate 605 and the electromagnetic layer are powered off, the electro-sealed bottom plate 605 is bent downward, and the lower end opening of the frame 601 is opened. After the electromagnetic layer is powered off, the magnetic squeezing plate 602 is reset under the rebound of the elastic band to avoid affecting the normal filtering work of the oil absorbing pad 603.

[0036] This embodiment lowers the liquid level by lowering the baffle 3, so that the surface cleaning liquid can flow naturally into the filter box 5, thereby taking away the oil film floating on the surface in time, which can effectively prevent the crankshaft from being contaminated again during the process of entering and exiting the ultrasonic cleaning box 1. The oil is adsorbed and filtered by the oil absorption component 6, and the oil absorption component 6 can be desorbed and deoiled by magnetic repulsion, thereby effectively improving the oil absorption effect of the oil absorption component 6. Compared with the existing technology, this embodiment can effectively prevent the crankshaft from being contaminated again, and at the same time promote the replacement of the bottom cleaning liquid through the bottom liquid return, thereby significantly improving the overall cleaning effect.

[0037] The second implementation method:

[0038] This embodiment further optimizes and improves the ultrasonic cleaning box 1 on the basis of the first embodiment, thereby further improving the cleaning effect of the crankshaft, while the rest of the parts remain consistent with the first embodiment;

[0039] like Figure 8 As shown, the middle part of the ultrasonic cleaning box 1 is fixedly connected with a discharge pipe 11, and the inside of the discharge pipe 11 is fixedly connected with a debris removal piece 12, the discharge pipe 11 is composed of an upper tapered tube and a lower straight tube, and the debris removal piece 12 includes a driving rod 13 fixedly connected to the inner wall of the discharge pipe 11, an upper blocking disc 14 and a lower blocking disc 15 fixedly connected to the upper and lower ends of the driving rod 13 respectively, and the upper blocking disc 14 and the lower blocking disc 15 have the same structure but different sizes. In the process of cleaning the crankshaft, as the cleaning work continues, the sludge, oxide scale and other impurities cleaned are continuously deposited at the bottom of the ultrasonic cleaning box 1. The existing technology solves this problem by regularly replacing the cleaning liquid, which greatly reduces the cleaning efficiency. Therefore, this embodiment performs online cleaning by arranging the debris removal piece 12. The specific working process is: before the cleaning work starts, the lower blocking disc 15 is in a flat state when the power is on, which can block the bottom of the discharge pipe 11. The cleaning fluid is then removed from the cleaning container 12 and the cleaning fluid is removed from the cleaning container 12. The cleaning fluid is then removed from the cleaning container 12 and the cleaning fluid is removed from the cleaning container 12.

[0040] like Figure 11As shown, the upper blocking disc 14 and the lower blocking disc 15 each include two symmetrically fixedly connected discs 16, a plurality of disc bones 17 fixedly embedded in the discs 16, and a shaping belt 18 connecting the plurality of disc bones 17 in series. The disc 16 is made of polyurethane elastic material, the disc bones 17 are made of elastic metal material, and the shaping belt 18 is made of highly elastic material (rubber material is preferably selected, and other materials can also be selected according to actual needs). The disc 16 relies on its own elasticity to switch back and forth between a flat state and a contracted and gathered state, thereby playing a role in online self-cleaning, and the disc bones 17 play a role in shaping the disc 16 to prevent the upper blocking disc 14 and the lower blocking disc 15 from being greatly deformed under the action of hydraulic pressure and losing their blocking function. The shaping belt 18 plays a role in limiting the disc bones 17 to prevent the disc bones 17 from being excessively deformed and losing their ability to rebound.

[0041] like Figure 9 、 10 As shown, one end of the upper blocking disc 14 and the lower blocking disc 15 are fixedly connected to the side wall of the driving rod 13, and the other ends of the upper blocking disc 14 and the lower blocking disc 15 are fixedly connected to the driven rod 20 facing the driving rod 13. The upper and lower ends of the driving rod 13 are fixedly inlaid with a fixed electromagnetic seat 1301 (made of electromagnetic material), and the inner wall of the driven rod 20 is fixedly inlaid with a dynamic electromagnetic seat 1302 (made of electromagnetic material) adsorbed with the fixed electromagnetic seat 1301. Before starting, the fixed electromagnetic seat 1301 and the moving electromagnetic seat 1302 in the downward blocking disc 15 are energized, so that the fixed electromagnetic seat 1301 and the moving electromagnetic seat 1302 are energized to generate a magnetic force that attracts each other. At this time, the two discs 16 are close to each other under the attraction force and present a flat shape. At this time, the lower blocking disc 15 is tightly fitted with the inner wall of the straight pipe below the discharge pipe 11, thereby playing a blocking role, while the fixed electromagnetic seat 1301 and the moving electromagnetic seat 1302 in the upper blocking disc 14 are in a power-off state. When the upper and lower blocking discs 14 are in the closed position, the upper and lower blocking discs 15 are in the closed position, and the upper and lower blocking discs 14 are in the closed position, and ...

[0042] like Figure 9、 10 As shown, a plurality of reset belts 19 are fixedly connected between the two discs 16 and are distributed around them at equal intervals. The reset belts 19 are made of elastic material (polyurethane elastic material is preferred, and other materials can also be selected according to actual needs). Since the upper blocking disc 14 and the lower blocking disc 15 are located at the bottom of the ultrasonic cleaning chamber 1, they will be affected by hydraulic pressure and it is difficult for them to maintain their shapes before and after deformation. Therefore, the reset belts 19 are added to offset the hydraulic pressure, thereby effectively reducing the impact of the hydraulic pressure on the upper blocking disc 14 and the lower blocking disc 15.

[0043] This embodiment utilizes the alternating blocking effect of the debris removal piece 12 to remove sludge and scale online, eliminating the trouble of manual regular cleaning, thereby effectively improving the cleaning efficiency.

[0044] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A surface heat treatment device for crankshaft processing, characterized in that: The ultrasonic cleaning box (1) comprises an ultrasonic cleaning box (1), wherein the upper side wall of the ultrasonic cleaning box (1) is provided with a slide groove, and the bottom of the slide groove is provided with an electric lifting column (2), the upper end of the electric lifting column (2) is fixedly connected with a baffle (3) which is sealingly and slidingly connected to the slide groove, and the middle side wall of the baffle (3) is provided with a liquid level sensor (4), the side of the ultrasonic cleaning box (1) is fixedly connected with a filter box (5), and the inside of the filter box (5) is provided with an oil suction piece (6), the lower end of the filter box (5) is connected with a return pipe (7), and the bottom of the ultrasonic cleaning box (1) is fixedly connected with a liquid outlet pipe (8) which is connected with the return pipe (7), a pressure pump (9) is provided on the return pipe (7), the side wall of the liquid outlet pipe (8) is provided with a plurality of nozzles distributed in an array, and the plurality of nozzles are all directed toward the middle of the ultrasonic cleaning box (1), the side wall of the filter box (5) is also fixedly connected with an oil storage tank (10), and the oil storage tank (10) is connected with the oil suction piece (6); The oil absorbing member (6) comprises a frame (601) fixedly connected to the inner wall of the filter box (5), a plurality of magnetic extrusion plates (602) arranged near the inner wall of the frame (601), an oil absorbing pad (603) filled in the middle of the frame (601), an oil removal port (604) opened on the outer wall of the frame (601) and connected to the oil storage tank (10), and a plurality of pairs of closable electro-sealed bottom plates (605) fixedly connected to the bottom of the frame (601).

2. The surface heat treatment device for crankshaft machining according to claim 1, characterized in that: The magnetic extrusion plate (602) is fixedly connected to the oil absorption pad (603), and the oil absorption pad (603) is connected to the inner side wall of the frame (601) via an elastic band. The side wall of the frame (601) facing the oil storage tank (10) is fixedly inlaid with an electromagnetic layer that repels the magnetic extrusion plate (602).

3. The surface heat treatment device for crankshaft machining according to claim 1, characterized in that: The electrically sealed bottom plate (605) is in a downwardly bent open state when power is off, and is in a horizontally closed state when power is on.

4. The surface heat treatment device for crankshaft machining according to claim 1, characterized in that: The middle of the ultrasonic cleaning box (1) is fixedly connected to a discharge pipe (11), and the interior of the discharge pipe (11) is fixedly connected to a debris removal component (12), wherein the discharge pipe (11) is composed of an upper conical pipe and a lower straight pipe, and the debris removal component (12) includes a driving rod (13) fixedly connected to the inner wall of the discharge pipe (11), an upper blocking disc (14) and a lower blocking disc (15) fixedly connected to the upper and lower ends of the driving rod (13), respectively, and the upper blocking disc (14) and the lower blocking disc (15) have the same structure but different sizes.

5. The surface heat treatment device for crankshaft machining according to claim 4, characterized in that: The upper blocking disc (14) and the lower blocking disc (15) each comprise two symmetrically fixedly connected disc plates (16), a plurality of disc bones (17) fixedly embedded in the disc plates (16), and a shaping belt (18) connecting the plurality of disc bones (17) in series.

6. The surface heat treatment device for crankshaft machining according to claim 4, characterized in that: One end of the upper blocking disc (14) and the lower blocking disc (15) are fixedly connected to the side wall of the driving rod (13), and the other ends of the upper blocking disc (14) and the lower blocking disc (15) are fixedly connected to the driven rod (20) facing the driving rod (13), the upper and lower ends of the driving rod (13) are fixedly embedded with a fixed electromagnetic seat (1301), and the inner wall of the driven rod (20) is fixedly embedded with a moving electromagnetic seat (1302) adsorbed with the fixed electromagnetic seat (1301).

7. The surface heat treatment device for crankshaft machining according to claim 5, characterized in that: The dish (16) is made of polyurethane elastic material, the dish bone (17) is made of elastic metal material, and the shaping belt (18) is made of high elastic material.

8. The surface heat treatment device for crankshaft machining according to claim 5, characterized in that: A plurality of reset belts (19) distributed around the two discs (16) are also fixedly connected between them, and the reset belts (19) are made of elastic material.

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