Emergency rescue trolley brake mechanism

Abstract

The invention discloses an emergency rescue trolley brake mechanism, and relates to the field of cableway rescue, the emergency rescue trolley brake mechanism comprises a connecting support, and one end of the connecting support is provided with an emergency brake mechanism. According to the device, a roller can make contact with the surface of a steel wire rope and rotate along with movement of a lever frame, a mounting shaft is driven to move, a rotating rod and a rotating disc are driven to rotate, a positioning block moves, a moving rod is driven to slide, a moving piston slides in a fixed cylinder in a reciprocating mode, air continuously passes through a connecting pipe and is sprayed out of a heat dissipation pipe, and heat dissipation is conducted on the surface of a brake wheel; the brake wheel is kept in a proper working temperature range; an existing V-shaped brake pad is replaced with the brake wheel, the brake wheel is matched with the walking wheel, the steel wire rope is locked for braking, the larger the weight of the manned mechanism is, the larger the extrusion force of the brake wheel on the steel wire rope is, the brake force is increased, meanwhile, the larger the angle of the steel wire rope is, the larger the extrusion force of the brake wheel on the steel wire rope is, and the brake force is also increased. And the stability and the safety of braking are improved.

Description

Technical Field

[0001] The invention relates to the technical field of cableway rescue, in particular to a brake mechanism of an emergency rescue trolley. Background Art

[0002] The cableway rescue trolley is a device specially used for cableway rescue. It is mainly used to deal with emergencies and faults in cableway transportation. It can quickly reach the fault site in the cableway transportation system and carry out fast and safe rescue and repair. The rescue trolley runs on the cableway. Once a fault occurs, the trolley needs to be stopped quickly by braking to prevent the rescue trolley from losing control and sliding down or colliding with other objects.

[0003] For example, the “A cableway rescue device based on a carrying rope” with publication number CN217575170U includes a traveling mechanism, a suspension mechanism, a braking mechanism, a seat system and an operating mechanism, wherein a suspension mechanism is movably arranged at the lower side of the traveling mechanism, a braking mechanism is arranged inside the suspension mechanism, a seat system is arranged at one end of the suspension mechanism, and an operating mechanism is arranged at the other end.

[0004] In the prior art, the main component of the existing brake mechanism is the V-shaped brake pad. When the angle of the wire rope changes, the V-shaped brake pad cannot be guaranteed to be always perpendicular to the wire rope. There is local wear during braking. During the braking process, the friction between the brake mechanism and the wire rope will generate a lot of heat. Continuous high temperature will accelerate the aging of the brake mechanism and affect the braking effect. Summary of the invention

[0005] The purpose of the present invention is to provide a brake mechanism for an emergency rescue trolley to solve the problems that the V-type brake pad proposed in the above-mentioned background technology cannot be guaranteed to be always perpendicular to the wire rope, there is local wear during braking, and during the braking process, the friction between the brake mechanism and the wire rope will generate a lot of heat. The roller will contact and rotate with the movement of the lever frame, drive the installation shaft to move, the rotating rod and the rotating disk to rotate, and the positioning block eccentrically arranged on one side of the rotating disk to move, drive the moving rod to slide, and the moving piston to slide back and forth inside the fixed cylinder. The air is continuously ejected from the heat dissipation pipe through the connecting pipe to dissipate the heat from the surface of the brake wheel, keep the brake wheel within a suitable working temperature range, and avoid the decrease of the friction coefficient due to overheating, thereby ensuring that the response speed and braking force of the brake system remain in the best state.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a brake mechanism for an emergency rescue vehicle, comprising a connecting bracket, one end of the connecting bracket is equipped with an emergency brake mechanism, one side of the emergency brake mechanism is equipped with a suspension walking mechanism, the emergency brake mechanism comprises a lever frame and a brake wheel, one end of the lever frame is fixedly connected to a connecting shaft, the outside of the connecting shaft is fixedly connected to the brake wheel, one side of the brake wheel is equipped with a heat dissipation mechanism, the heat dissipation mechanism comprises a rotating rod, one end of the rotating rod is fixedly connected to one end of the connecting shaft, one end of the rotating rod is fixedly connected to a rotating disk, and the rotating A positioning block is fixedly connected to one side of the disk, and the positioning block is externally slidably connected to a guide frame, and a moving rod is fixedly connected to one side of the guide frame, and one end of the moving rod is fixedly connected to a moving piston, and the mobile piston is externally slidably connected to a fixed cylinder, and one end of the fixed cylinder is fixedly connected to a connecting pipe, and one end of the connecting pipe is fixedly connected to a heat dissipation pipe. The heat dissipation mechanism is used to cool and dissipate heat at the brake wheel of an emergency brake, and the emergency brake mechanism increases the squeezing force on the wire rope through a lever structure, and holds the wire rope tightly when braking, and the suspended walking mechanism is used to suspend on the wire rope for the trolley to walk.

[0007] Preferably, a support plate is fixedly connected to the outside of the fixing cylinder, and one end of the support plate is fixedly connected to one side of the lever frame.

[0008] Preferably, a connecting plate is fixedly connected to the outside of the heat dissipation pipe, and one end of the connecting plate is fixedly connected to one side of the support plate.

[0009] Preferably, one side of the lever frame is fixedly connected to a mounting frame, one side of the mounting frame is rotatably connected to a mounting shaft, the outside of the mounting shaft is fixedly connected to a roller, and a belt assembly is installed between the end of the mounting shaft and the outside of the rotating rod.

[0010] Preferably, both ends of the brake wheel are fixedly connected with heat dissipation fins, and a plurality of the heat dissipation fins are distributed around the ends of the brake wheel.

[0011] Preferably, one end of the lever frame is rotatably connected to one end of the connecting bracket, a fixed shaft is installed in the middle of the lever frame, a locking groove is opened on one side of the lever frame, a locking tooth is locked inside the locking groove, an operating rod is rotatably connected to the middle of the locking tooth, one end of the operating rod is installed on the outside of the lever frame, a return spring is installed on the inside of the operating rod, and one end of the return spring is installed on one end of the locking tooth.

[0012] Preferably, one end of the operating rod is fixedly connected to an operating shaft, and the outside of the operating shaft is fixedly connected to a handle.

[0013] Preferably, the suspension walking mechanism comprises a connecting frame, one end of the connecting frame is mounted on the end of the fixed shaft, the other end of the connecting frame is mounted with a suspension, and the end of the suspension is mounted with a magnetic seat.

[0014] Preferably, a permanent magnet is installed on one side of the magnetic base, a speed reduction disc is arranged outside the permanent magnet, and one end of the speed reduction disc is rotatably connected to one side of the magnetic base.

[0015] Preferably, a speed increaser is installed on the inner side of the magnetic base, and running wheels are installed on the outer side of the speed increaser.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the roller will contact and rotate with the surface of the wire rope as the lever frame moves, driving the installation shaft to move, the rotating rod and the rotating disk to rotate, and the positioning block eccentrically arranged on one side of the rotating disk to move, driving the moving rod to slide, and the moving piston to slide back and forth inside the fixed cylinder. The air is continuously ejected from the heat dissipation pipe through the connecting pipe to dissipate the heat from the surface of the brake wheel, keeping the brake wheel within a suitable working temperature range, avoiding the decrease in friction coefficient due to overheating, thereby ensuring that the response speed and braking force of the brake system remain in the best state.

[0017] 2. In the present invention, the existing V-shaped brake pad is replaced with a brake wheel, and the brake wheel cooperates with the walking wheel to lock the wire rope for braking. The greater the weight on the manned mechanism installed at one end of the connecting bracket, the greater the squeezing force of the brake wheel on the wire rope will be, and the braking force will increase. The greater the angle of the wire rope, the greater the force arm of the manned mechanism will be, the greater the squeezing force of the brake wheel on the wire rope will be, and the braking force will also increase, thereby improving the stability and safety of braking.

[0018] 3. In the present invention, the deceleration plate rotates at high speed under the drive of the speed increaser, cutting the magnetic lines of force on the magnetic seat, forming eddy currents on the deceleration plate, applying a reaction force to the speed increaser, keeping the rescue vehicle running at a uniform speed, and being able to automatically adjust the braking torque according to the downward speed of the vehicle to achieve uniform speed operation, effectively controlling the running speed of the vehicle, and ensuring safe and smooth operation during emergency rescue. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a brake mechanism of an emergency rescue vehicle of the present invention; Figure 2 This is a schematic diagram of the connection structure of a heat dissipation mechanism of a brake mechanism of an emergency rescue vehicle according to the present invention; Figure 3 This is a schematic diagram of a first disassembled structure of a heat dissipation mechanism of a brake mechanism of an emergency rescue vehicle according to the present invention; Figure 4It is a schematic diagram of the second disassembled structure of a heat dissipation mechanism of a brake mechanism of an emergency rescue vehicle according to the present invention; Figure 5 A schematic diagram of the connection structure of an emergency brake mechanism of an emergency rescue vehicle brake mechanism of the present invention; Figure 6 This is a schematic diagram of the connection structure of the suspension travel mechanism of the emergency rescue vehicle brake mechanism of the present invention; Figure 7 The present invention is a schematic diagram of the disassembled structure of a suspension travel mechanism of an emergency rescue vehicle brake mechanism.

[0020] In the figure: 1. connecting bracket; 2. emergency brake mechanism; 21. lever frame; 22. brake wheel; 23. heat dissipation fin; 24. connecting shaft; 25. positioning groove; 26. positioning tooth; 27. operating shaft; 28. grip; 29. ​​operating lever; 210. reset spring; 211. fixed shaft; 3. heat dissipation mechanism; 31. fixed cylinder; 32. rotating disk; 33. roller; 34. mounting frame; 35. mounting shaft; 36. belt assembly; 37. rotating rod; 38. heat dissipation pipe; 39. connecting plate; 310. moving piston; 311. connecting pipe; 312. support plate; 313. moving rod; 314. guide frame; 315. positioning block; 4. suspension walking mechanism; 41. connecting frame; 42. speed reduction plate; 43. suspension; 44. magnetic seat; 45. permanent magnet; 46. walking wheel; 47. speed increaser. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Reference Figure 1 - Figure 7As shown: a brake mechanism of an emergency rescue trolley, comprising a connecting bracket 1, an emergency brake mechanism 2 is installed at one end of the connecting bracket 1, a suspension walking mechanism 4 is installed on one side of the emergency brake mechanism 2, the emergency brake mechanism 2 comprises a lever frame 21 and a brake wheel 22, one end of the lever frame 21 is fixedly connected to a connecting shaft 24, the outside of the connecting shaft 24 is fixedly connected to the brake wheel 22, a heat dissipation mechanism 3 is installed on one side of the brake wheel 22, the heat dissipation mechanism 3 comprises a rotating rod 37, one end of the rotating rod 37 is fixedly connected to one end of the connecting shaft 24, one end of the rotating rod 37 is fixedly connected to a rotating disk 32, one side of the rotating disk 32 is fixedly connected to a positioning block 315, the outside of the positioning block 315 is slidably connected to a guide frame 314, one side of the guide frame 314 is fixedly connected to a moving rod 313, one end of the moving rod 313 is fixedly connected to a moving piston 310, the outside of the moving piston 310 is slidably connected to a fixed cylinder 31, one end of the fixed cylinder 31 is fixedly connected to a connecting pipe 311, and the connecting pipe 3 One end of 11 is fixedly connected with a heat dissipation pipe 38, and the heat dissipation mechanism 3 is used to cool and dissipate the heat of the brake wheel 22 of the emergency brake. The emergency brake mechanism 2 increases the squeezing force on the wire rope through the lever structure, and holds the wire rope tightly during braking, thereby improving the stability and safety of the brake. The suspension travel mechanism 4 is used to suspend on the wire rope for the trolley to travel, and can automatically adjust the braking torque according to the downward speed of the trolley to achieve uniform speed operation and effectively control the running speed of the trolley; the outside of the fixed cylinder 31 is fixedly connected with a support plate 312, and one end of the support plate 312 is fixedly connected to one side of the lever frame 21; the outside of the heat dissipation pipe 38 is fixedly connected with a connecting plate 39, and one end of the connecting plate 39 is fixedly connected to one side of the support plate 312; one side of the lever frame 21 is fixedly connected with a mounting frame 34, and one side of the mounting frame 34 is rotatably connected with a mounting shaft 35, and the outside of the mounting shaft 35 is fixedly connected with a roller 33, and a belt assembly 36 is installed between the end of the mounting shaft 35 and the outside of the rotating rod 37.

[0023] In this embodiment, when braking, the emergency brake mechanism 2 is set so that the brake wheel 22 and the walking wheel 46 cooperate to lock the wire rope and brake the emergency rescue vehicle. During the braking process, the roller 33 will move with the lever frame 21 and contact the surface of the wire rope. The roller 33 rotates along the surface of the wire rope, driving the installation shaft 35 to move. The belt assembly 36 is composed of two pulleys and a transmission belt, which drives the rotating rod 37 and the rotating disk 32 to rotate. The positioning block 315 eccentrically set on one side of the rotating disk 32 moves, and the positioning block 315 slides inside the guide frame 314, while driving the moving rod 313 to slide on one end of the fixed cylinder 31, and the positioning block 315 continues to make a circular motion, and the moving piston 310 slides back and forth inside the fixed cylinder 31. The support plate 312 is used to support and fix the fixed cylinder 31, and the connecting plate 39 is used to support and fix the heat dissipation pipe 38, so as to drive the air to be continuously sucked into and discharged from the fixed cylinder 31. The air continuously enters the fixed cylinder 31 through the heat dissipation pipe 38 and the connecting pipe 311, and is ejected from the heat dissipation pipe 38 through the connecting pipe 311. A plurality of nozzles are fixedly connected to the outer surface of the heat dissipation pipe 38, and the heat dissipation pipe 38 is of arc-shaped design, which can increase the heat dissipation area of ​​the outer surface of the brake wheel 22, speed up the air flow between the brake wheel 22 and the wire rope, dissipate the heat on the surface of the brake wheel 22, keep the brake wheel 22 within a suitable working temperature range, avoid the decrease of the friction coefficient due to overheating, thereby ensuring that the response speed and braking force of the brake system are maintained in an optimal state.

[0024] Embodiment 2: Figure 1 , Figure 2 and Figure 5 As shown, both ends of the brake wheel 22 are fixedly connected with heat dissipation fins 23, and multiple heat dissipation fins 23 are distributed around the end of the brake wheel 22; one end of the lever frame 21 is rotatably connected to one end of the connecting bracket 1, and a fixed shaft 211 is installed in the middle of the lever frame 21. A locking groove 25 is opened on one side of the lever frame 21, and a locking tooth 26 is clamped inside the locking groove 25. An operating rod 29 is rotatably connected to the middle of the locking tooth 26. One end of the operating rod 29 is installed on the outside of the lever frame 21, and a return spring 210 is installed on the inside of the operating rod 29. One end of the return spring 210 is installed on one end of the locking tooth 26; one end of the operating rod 29 is fixedly connected to an operating shaft 27, and the outside of the operating shaft 27 is fixedly connected to a handle 28.

[0025] In this embodiment, a handle 28 is installed on the outside of the operating shaft 27. By holding the handle 28, the operating shaft 27 and the operating rod 29 are driven to rotate, and the locking tooth 26 is locked in the inside of the locking groove 25, driving the lever frame 21 to rotate. At this time, the brake wheel 22 is not in contact with the wire rope, and the trolley can operate normally. When braking is needed, the handle 28 is released, and the gravity causes the lever frame 21 to rotate outside the fixed shaft 211, driving the brake wheel 22 to move to contact the wire rope. The brake wheel 22 cooperates with the walking wheel 46 to lock the wire rope for braking. The existing V-shaped brake pad is replaced by the brake wheel 22. The wire rope changes at different angles to always ensure The contact area between the brake wheel 22 and the wire rope remains unchanged. The emergency brake mechanism 2 is based on the principle of a lever. The greater the weight on the manned mechanism installed at one end of the connecting bracket 1, the greater the squeezing force of the brake wheel 22 on the wire rope will be, and the braking force will increase. The greater the angle of the wire rope, the greater the force arm of the manned mechanism will be, the greater the squeezing force of the brake wheel 22 on the wire rope will be, and the braking force will also increase, thereby improving the stability and safety of the brake. Heat dissipation fins 23 are provided at both ends of the brake wheel 22, and the heat dissipation fins 23 are of wavy design and are distributed in a ring at the end of the brake wheel 22, which can increase the contact area between the brake wheel 22 and the air and improve the heat dissipation effect.

[0026] Embodiment 3: According to Figure 1 , Figure 6 and Figure 7 As shown, the suspension walking mechanism 4 includes a connecting frame 41, one end of the connecting frame 41 is installed on the end of the fixed shaft 211, the other end of the connecting frame 41 is installed with a suspension 43, and the end of the suspension 43 is installed with a magnetic base 44; a permanent magnet 45 is installed on one side of the magnetic base 44, and a reduction disc 42 is arranged on the outside of the permanent magnet 45, and one end of the reduction disc 42 is rotatably connected to one side of the magnetic base 44; a speed increaser 47 is installed on the inner side of the magnetic base 44, and a walking wheel 46 is installed on the outside of the speed increaser 47.

[0027] In this embodiment, the reduction disc 42 rotates at high speed driven by the speed increaser 47, cutting the magnetic lines of force on the magnetic seat 44 and forming eddy currents on the reduction disc 42. The counter-braking force formed by the eddy currents acts on the reduction disc 42, and the reduction disc 42 applies a reaction force to the speed increaser 47, so that the walking wheel 46 slows down. Since the size of the counter-braking torque is proportional to the rotational speed, that is, the faster the vehicle goes down, the greater the reaction force applied by the reduction disc 42 to the speed increaser 47, thereby keeping the rescue vehicle running at a uniform speed. The braking torque can be automatically adjusted according to the downward speed of the vehicle to achieve uniform operation, effectively control the running speed of the vehicle, and ensure safe and smooth operation during emergency rescue.

[0028] The method of use and working principle of the device are as follows: by holding the handle 28, the operating shaft 27 and the operating rod 29 are driven to rotate, and the locking tooth 26 is locked into the inside of the locking groove 25, driving the lever frame 21 to rotate. At this time, the brake wheel 22 is not in contact with the wire rope, and the trolley can operate normally. During the operation of the trolley, the speed reduction disc 42 rotates at a high speed driven by the speed increaser 47, cutting the magnetic lines of force on the magnetic seat 44, forming eddy currents on the speed reduction disc 42, and the counter-braking force formed by the eddy currents acts on the speed reduction disc 42, and the speed reduction disc 42 applies a reaction force to the speed increaser 47, so that the walking wheel 46 slows down, and the rescue trolley runs at a uniform speed. When braking is needed, release the handle 28, and gravity causes the lever frame 21 to be fixed in place. The external rotation of the fixed shaft 211 drives the brake wheel 22 to move and contact the wire rope. The brake wheel 22 cooperates with the walking wheel 46 to lock the wire rope and brake. During the braking process, the roller 33 will move with the lever frame 21 and contact the surface of the wire rope. The roller 33 rotates along the surface of the wire rope, driving the installation shaft 35 to move, the rotating rod 37 and the rotating disk 32 to rotate, and the positioning block 315 to move, driving the moving rod 313 to slide on one end of the fixed cylinder 31, and the moving piston 310 to slide back and forth inside the fixed cylinder 31. The air continuously passes through the connecting pipe 311 and is ejected from the heat dissipation pipe 38, thereby accelerating the air flow between the brake wheel 22 and the wire rope and dissipating the heat on the surface of the brake wheel 22.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A brake mechanism for an emergency rescue vehicle, comprising a connecting bracket (1), characterized in that: An emergency brake mechanism (2) is installed at one end of the connecting bracket (1), and a suspension walking mechanism (4) is installed on one side of the emergency brake mechanism (2). The emergency brake mechanism (2) comprises a lever frame (21) and a brake wheel (22), and one end of the lever frame (21) is fixedly connected to a connecting shaft (24), and the outside of the connecting shaft (24) is fixedly connected to the brake wheel (22). A heat dissipation mechanism (3) is installed on one side of the brake wheel (22), and the heat dissipation mechanism (3) comprises a rotating rod (37), one end of the rotating rod (37) is fixedly connected to one end of the connecting shaft (24), one end of the rotating rod (37) is fixedly connected to a rotating disk (32), and one side of the rotating disk (32) is fixedly connected to a positioning block (315), and the positioning block (315) is fixedly connected to the rotating disk (32). The outside of the positioning block (315) is slidably connected to a guide frame (314), one side of the guide frame (314) is fixedly connected to a moving rod (313), one end of the moving rod (313) is fixedly connected to a moving piston (310), the outside of the moving piston (310) is slidably connected to a fixed cylinder (31), one end of the fixed cylinder (31) is fixedly connected to a connecting pipe (311), one end of the connecting pipe (311) is fixedly connected to a heat dissipation pipe (38), the heat dissipation mechanism (3) is used to cool and dissipate heat at the brake wheel (22) of the emergency brake, the emergency brake mechanism (2) increases the squeezing force on the steel wire rope through the lever structure, and is tightly held with the steel wire rope during braking, and the suspension travel mechanism (4) is used to suspend on the steel wire rope to travel the trolley.

2. The emergency rescue vehicle brake mechanism according to claim 1, characterized in that: A support plate (312) is fixedly connected to the outside of the fixed cylinder (31), and one end of the support plate (312) is fixedly connected to one side of the lever frame (21).

3. The brake mechanism of an emergency rescue vehicle according to claim 1, characterized in that: A connecting plate (39) is fixedly connected to the outside of the heat dissipation pipe (38), and one end of the connecting plate (39) is fixedly connected to one side of the support plate (312).

4. The emergency rescue vehicle brake mechanism according to claim 1, characterized in that: A mounting frame (34) is fixedly connected to one side of the lever frame (21), a mounting shaft (35) is rotatably connected to one side of the mounting frame (34), a roller (33) is fixedly connected to the outside of the mounting shaft (35), and a belt assembly (36) is installed between the end of the mounting shaft (35) and the outside of the rotating rod (37).

5. The brake mechanism of an emergency rescue vehicle according to claim 1, characterized in that: Both ends of the brake wheel (22) are fixedly connected with heat dissipation fins (23), and a plurality of heat dissipation fins (23) are distributed around the ends of the brake wheel (22).

6. The emergency rescue vehicle brake mechanism according to claim 1, characterized in that: One end of the lever frame (21) is rotatably connected to one end of the connecting bracket (1); a fixed shaft (211) is installed in the middle of the lever frame (21); a locking groove (25) is opened on one side of the lever frame (21); a locking tooth (26) is locked inside the locking groove (25); an operating rod (29) is rotatably connected to the middle of the locking tooth (26); one end of the operating rod (29) is installed on the outside of the lever frame (21); a return spring (210) is installed on the inside of the operating rod (29); and one end of the return spring (210) is installed on one end of the locking tooth (26).

7. The brake mechanism of an emergency rescue vehicle according to claim 6, characterized in that: One end of the operating rod (29) is fixedly connected to an operating shaft (27), and the outside of the operating shaft (27) is fixedly connected to a handle (28).

8. The brake mechanism of an emergency rescue vehicle according to claim 1, characterized in that: The suspension travel mechanism (4) comprises a connecting frame (41), one end of the connecting frame (41) is mounted on the end of a fixed shaft (211), the other end of the connecting frame (41) is mounted with a suspension frame (43), and the end of the suspension frame (43) is mounted with a magnetic seat (44).

9. The emergency rescue vehicle brake mechanism according to claim 8, characterized in that: A permanent magnet (45) is installed on one side of the magnetic base (44), a speed reduction disc (42) is arranged outside the permanent magnet (45), and one end of the speed reduction disc (42) is rotatably connected to one side of the magnetic base (44).

10. The emergency rescue vehicle brake mechanism according to claim 8, characterized in that: A speed increaser (47) is installed on the inner side of the magnetic seat (44), and a travel wheel (46) is installed on the outer side of the speed increaser (47).

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