A head opening and closing mechanism

Abstract

The present invention provides a vehicle front opening and closing mechanism. It includes a rocker arm, a locking rod and a resistance wheel; the rocker arm is connected to a movable cabin door, and one end of the rocker arm away from the movable cabin door is hinged to a cabin frame; the locking rod includes a first rod body, a second rod body and a third rod body, the first end of the second rod body is vertically connected to the first rod body, and the second end of the second rod body is vertically connected to the third rod body to form a Z-shaped structure; a rotatable sliding member is provided at one end of the first rod body away from the second rod body, and a slide rail matching the sliding member is provided on the rocker arm; the third rod body is hinged to the cabin frame, and the third rod body is rotated to drive the rocker arm to rotate; the resistance wheel is arranged on the cabin frame and is located on the rotation track of the first end of the second rod body. The present invention forms a resistance to the first end of the second rod body when the locking rod and the rocker arm are about to form a dead point locking position by arranging a resistance wheel on the rotation track of the first end of the second rod body, thereby providing a hand feeling signal that the movable cabin door is about to be locked in place.

Description

Technical Field

[0001] The invention relates to the technical field of rail vehicles, and in particular to a locomotive opening and closing mechanism. Background Art

[0002] Usually, in order to effectively reduce air resistance and beautify the appearance of locomotives such as urban rail, EMU or high-speed rail locomotives, the front end of the locomotive adopts a streamlined deflector. At the same time, in order to ensure the coupling of the car hook, the streamlined deflector is designed as two movable doors (left and right doors), and a front opening and closing mechanism is specially designed to realize the opening and closing of the doors. When the locomotive needs to be coupled, the left and right doors of the opening and closing mechanism are opened to expose the car hook for coupling. At present, there are two main manual opening and closing methods for opening and closing mechanisms at home and abroad: roller plus guide groove dead point locking and slider plus guide rail dead point locking. The opening and closing mechanism of the slider plus guide rail dead point locking has no obvious signal of being locked in place, which can easily cause the operator to mistakenly think that the door is locked, resulting in the failure of the door to open automatically during driving.

[0003] In summary, there is an urgent need for a vehicle head opening and closing mechanism to solve the problems existing in the prior art. Summary of the invention

[0004] The present invention aims to provide a locomotive opening and closing mechanism to solve the problem that the locomotive opening and closing mechanism cannot provide a locking signal.

[0005] To achieve the above-mentioned purpose, the present invention provides a vehicle head opening and closing mechanism, comprising a rocker arm, a locking rod and a resistance wheel; the rocker arm is connected to a movable door, and one end of the rocker arm away from the movable door is hinged to a cabin frame, and the movable door is opened and closed by rotating the rocker arm;

[0006] The locking rod comprises a first rod body, a second rod body and a third rod body, wherein the first end of the second rod body is vertically connected to the first rod body, and the second end of the second rod body is vertically connected to the third rod body to form a Z-shaped structure; a rotatable sliding member is provided at one end of the first rod body away from the second rod body, and a slide rail cooperating with the sliding member is provided on the rocker arm; the third rod body is hinged to the cabin frame, and the rocker arm is driven to rotate by rotating the third rod body;

[0007] The resistance wheel is arranged on the cabin frame and located on the rotation track of the first end of the second rod body, and is used to form resistance to the first end of the second rod body when the locking rod and the rocker arm are about to form a dead point locking position.

[0008] Preferably, the second rod body includes a telescopic rod body and an elastic member sleeved on the telescopic rod body, the telescopic rod body includes two cylinders that can slide relative to each other, and the two cylinders are provided with limiting members for limiting the two ends of the elastic member; the first end of the telescopic rod body is fixedly connected to the first rod body; the second end of the telescopic rod body is fixedly connected to the third rod body; the second rod body is allowed to pass over the resistance wheel by compressing the telescopic rod body and the elastic member.

[0009] Preferably, the first end of the second rod body is an arc end, so as to facilitate the first end of the second rod body to pass over the resistance wheel.

[0010] Preferably, one end of the third rod body away from the second rod body extends out of the cabin frame, and the free end of the third rod body extending out of the cabin frame is provided with a hexagonal prism cooperating with a wrench.

[0011] Preferably, there is a gap of 0.1 mm to 0.2 mm between the outer surface of the sliding member and the inner wall of the slide rail.

[0012] Preferably, a stopper is provided at the end of the slide rail, and the stopper collides with the sliding member to generate a locked-in-place signal.

[0013] Preferably, the sliding member includes a roller rotatably connected to the first rod body.

[0014] Preferably, the sliding member further comprises a guide wheel and a sliding frame; the roller and the guide wheel are rotatably arranged inside the sliding frame along the length direction of the sliding frame, so that the sliding member will not shake when sliding inside the slide rail.

[0015] Preferably, there is a gap of 0.1 mm to 0.2 mm between the rolling surface of the roller and the rolling surface of the guide wheel.

[0016] Preferably, the resistance wheel comprises a resistance wheel body and a resistance wheel rotating shaft, the resistance wheel body is sleeved on the resistance wheel rotating shaft and the resistance wheel body rotates around the resistance wheel rotating shaft; the resistance wheel rotating shaft is connected to the cabin frame.

[0017] The application of the technical solution of the present invention has the following beneficial effects:

[0018] (1) In the present invention, the resistance wheel is arranged on the cabin frame and is located on the rotation track of the first end of the second rod body, and is used to form resistance to the first end of the second rod body when the locking rod and the rocker arm are about to form a dead point locking position. At this time, it is equivalent to providing the operator with a hand feeling signal that the movable cabin door is about to be locked in place. The operator must continue to increase the force and continue to rotate the third rod body of the locking rod to make the first end of the second rod body pass over the resistance wheel to complete the cabin door locking.

[0019] (2) In the present invention, the second rod body includes a telescopic rod body and an elastic member. The first end of the second rod body is made to pass over the resistance wheel by compressing the telescopic rod body and the elastic member, thereby completing the locking of the movable door.

[0020] (3) In the present invention, the first end of the second rod body is an arc end, which facilitates the first end of the second rod body to pass over the resistance wheel to complete the locking of the movable door.

[0021] (4) In the present invention, the free end of the third rod extending out of the cabin frame is provided with a hexagonal prism that cooperates with a wrench, so that the operator can rotate the third rod by the wrench to realize manual opening and closing of the movable cabin door.

[0022] (5) In the present invention, there is a gap of 0.1 mm to 0.2 mm between the outer surface of the sliding member and the inner wall of the slide rail to prevent the movement of the mechanism from getting stuck.

[0023] (6) In the present invention, a stopper is provided at the end of the slide rail along the axial direction, and a clear impact sound is produced when the stopper collides with the sliding member, prompting the operator that the movable door has been locked in place.

[0024] (7) In the present invention, the sliding member includes a roller rotatably connected to the first rod body, which is used to reduce the friction resistance of the sliding member inside the slide rail, thereby effectively improving the operating comfort.

[0025] (8) In the present invention, the sliding member also includes a guide wheel and a sliding frame; the roller and the guide wheel are rotatably arranged inside the sliding frame along the length direction of the sliding frame, thereby increasing the length dimension of the sliding member and preventing the sliding member from shaking when sliding inside the slide rail. There is a gap of 0.1 mm to 0.2 mm between the rolling surface of the roller and the rolling surface of the guide wheel, thereby avoiding interference between the roller and the guide wheel when they rotate.

[0026] (9) In the present invention, the resistance wheel includes a resistance wheel body and a resistance wheel rotating shaft. The resistance wheel body is sleeved on the resistance wheel rotating shaft and the resistance wheel body rotates around the resistance wheel rotating shaft, so that the second rod body passes over the resistance wheel.

[0027] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 This is a schematic diagram of the connection between a vehicle front opening and closing mechanism, a cabin frame and a movable cabin door in an embodiment of the present application;

[0030] Figure 2 This is a schematic diagram of the structure of a vehicle head opening and closing mechanism in an embodiment of the present application;

[0031] Figure 3 yes Figure 2 A magnified view of the details of part A;

[0032] Figure 4 is a schematic diagram of the cooperation between the locking rod, the resistance wheel and the slide rail in the embodiment of the present application;

[0033] Figure 5 is a schematic diagram of the cooperation between the slide rail and the sliding member in the embodiment of the present application;

[0034] Figure 6 is a schematic structural diagram of a sliding member in an embodiment of the present application;

[0035] Figure 7 is a cross-sectional view parallel to the axis of the roller and the guide wheel in the embodiment of the present application;

[0036] Figure 8 This is a schematic diagram of the connection between the resistance wheel and the cabin frame in the embodiment of the present application;

[0037] Among them, 1. rocker arm, 1.1. slide rail, 1.1.1. block, 1.1.2. slide rail body, 1.1.3. baffle, 2. locking rod, 2.1. first rod body, 2.2. second rod body, 2.2.1. telescopic rod body, 2.2.2. elastic part, 2.2.3. rubber sheath, 2.2.4. limiting boss, 2.2.5. limiting nut, 2.3. third rod body, 2.3.1. hexagonal prism, 2.4. sliding part, 2.4.1. roller, 2.4.2. guide wheel, 2.4.3. sliding frame, 2.4.4. connecting sleeve, 2.4.5. bushing, 3. resistance wheel, 3.1. resistance wheel body, 3.2. resistance wheel shaft, 3.3. mounting plate, 4. cabin frame, 5. movable cabin door. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0039] Embodiment 1:

[0040] See also Figures 1 to 8 , a locomotive opening and closing mechanism, this embodiment is used to realize the opening and closing of the locomotive locomotive and provide a locking signal.

[0041] A vehicle head opening and closing mechanism, comprising a rocker arm 1, a locking rod 2 and a resistance wheel 3; the rocker arm 1 is connected to a movable door 5, and one end of the rocker arm 1 away from the movable door 5 is hinged to a cabin frame 4, and the movable door 5 is opened and closed by rotating the rocker arm 1; Figure 1 In this embodiment, two rocker arms 1 are respectively connected to the left and right movable doors 5, and the two movable doors 5 are driven to move by the rotation of the two rocker arms 1 to realize the opening and closing of the doors.

[0042] The locking rod 2 includes a first rod body 2.1, a second rod body 2.2 and a third rod body 2.3, wherein a first end of the second rod body 2.2 is vertically connected to the first rod body 2.1, and a second end of the second rod body 2.2 is vertically connected to the third rod body 2.3 to form a Z-shaped structure; a rotatable sliding member 2.4 is provided at one end of the first rod body 2.1 away from the second rod body 2.2, a slide rail 1.1 cooperating with the sliding member 2.4 is provided on the rocker arm 1, and the sliding member 2.4 can slide back and forth in the slide rail 1.1; the third rod body 2.3 is hinged to the cabin frame, and the second rod body 2.2 and the first rod body 2.1 are driven to move by rotating the third rod body 2.3, so that the sliding member 2.4 slides in the slide rail 1.1, driving the rocker arm 1 to rotate, thereby realizing the opening and closing of the movable cabin door 5;

[0043] The resistance wheel 3 is arranged on the cabin frame 4 and is located on the rotation track of the first end of the second rod body 2.2, and is used to form resistance to the first end of the second rod body 2.2 when the locking rod 2 and the rocker arm 1 are about to form a dead point locking position. Figures 2 to 3 As shown, at this time, it is equivalent to providing the operator with a hand feeling signal that the movable door 5 is about to be locked in place. The operator must continue to increase the force to rotate the third rod body 2.3 to make the first end of the second rod body 2.2 pass over the resistance wheel 3 to complete the door locking.

[0044] In this embodiment, when the axis of the second rod body 2.2 and the axis of the slide rail 1.1 reach 90°, they reach the dead point position (a single movable door 5 has two dead point positions, namely the dead point position when the movable door 5 is opened and the dead point position when the movable door 5 is closed); the resistance wheel 3 is located at the front end of the second rod body 2.2 and the rocker arm 1 which are about to reach the dead point position. When the first end of the second rod body 2.2 contacts the resistance wheel 3, the angle between the axis of the second rod body 2.2 and the axis of the slide rail 1.1 is 95°~97°, and the maximum overlap between the first end of the second rod body 2.2 and the resistance wheel 3 is 1.5mm~1.8mm. According to the actual processing conditions, the diameter of the resistance wheel 3 can be appropriately changed to ensure the overlap between the first end of the second rod body 2.2 and the resistance wheel 3.

[0045] The second rod body 2.2 includes a telescopic rod body 2.2.1 and an elastic member 2.2.2 sleeved on the telescopic rod body 2.2.1. The telescopic rod body 2.2.1 includes two cylinders that can slide relative to each other. The two cylinders are provided with limit members for limiting the two ends of the elastic member 2.2.2. The inner cylinder can also be a solid shaft. In this embodiment, the elastic member 2.2.2 is a spring. The telescopic rod body 2.2.1 includes an outer cylinder and an inner shaft that are nested. The outer cylinder and the inner shaft can slide relative to each other. The inner shaft is in the elastic member 2.2.1. .2.2 is provided with a limiting boss 2.2.4 at one end, and a limiting nut 2.2.5 is provided at the other end of the elastic member 2.2.2 of the outer cylinder to prevent the elastic member 2.2.2 from coming off the telescopic rod body 2.2.1; the first end of the telescopic rod body 2.2.1 is fixedly connected to the first rod body 2.1 through the inner shaft; the second end of the telescopic rod body 2.2.1 is fixedly connected to the third rod body 2.3 through the outer cylinder; the first end of the second rod body 2.2 is made to pass over the resistance wheel 3 by compressing the telescopic rod body 2.2.1 and the elastic member 2.2.2. Figure 4 At the same time, the elastic member 2.2.2 can make the sliding member 2.4 press against the rocker arm 1, so that the movable door 5 will not shake after being locked in place. In this embodiment, the working pressure of the elastic member 2.2.2 is 800N, and a rubber sheath 2.2.3 is provided on the outside of the elastic member 2.2.2 to provide external protection for the elastic member 2.2.2 and the telescopic rod body 2.2.1.

[0046] The first end of the second rod body 2.2 is an arc end, which is convenient for the first end of the second rod body 2.2 to pass over the resistance wheel 3 to complete the locking of the movable door 5.

[0047] One end of the third rod 2.3 away from the second rod 2.2 extends out of the cabin frame 4, and the free end of the third rod 2.3 extending out of the cabin frame 4 is provided with a hexagonal prism 2.3.1 that cooperates with a wrench. Figure 3 As shown, the operator can rotate the third rod 2.3 by a wrench to manually open and close the movable hatch 5. When the locomotives need to be coupled, the hexagonal prism 2.3.1 is rotated by a wrench to control the left and right movable hatches 5 to open, exposing the hooks to achieve coupling of two locomotives.

[0048] There is a gap of 0.1mm to 0.2mm between the outer surface of the sliding member 2.4 and the inner wall of the slide rail 1.1 to prevent the mechanism from getting stuck. In this embodiment, there is a gap of 0.1mm to 0.2mm between the upper and lower surfaces and the two side surfaces of the sliding member 2.4 and the inner wall of the slide rail 1.1 to prevent the sliding member 2.4 from getting stuck inside the slide rail 1.1. In this embodiment, the slide rail 1.1 includes a detachably connected slide rail body 1.1.2 and a baffle 1.1.3. The slide rail body 1.1.2 and the baffle 1.1.3 are combined to form a sliding channel for the sliding member 2.4. Figure 5 shown.

[0049] The end of the slide rail 1.1 along the axial direction is provided with a stopper 1.1.1. Figure 3 As shown, the block 1.1.1 collides with the sliding member 2.4 to produce a clear impact sound, prompting the operator that the movable door 5 has been locked in place. In this embodiment, after the second rod 2.2 passes over the resistance wheel 3, under the action of the elastic member 2.2.2, the sliding member 2.4 quickly rushes to the block 1.1.1, producing a 58DB-65DB impact sound, prompting the operator that the movable door 5 has been locked in place. In order to ensure the wear resistance and rust resistance of the slide rail 1.1, the material is quenched with 14Cr17Ni2, with a hardness of HRC28-32.

[0050] The sliding member 2.4 includes a roller 2.4.1 rotatably connected to the first rod body 2.1. Figure 5 As shown, it is used to reduce the friction resistance of the sliding member 2.4 inside the slide rail 1.1, effectively improving the operating comfort.

[0051] The sliding member 2.4 also includes a guide wheel 2.4.2 and a sliding frame 2.4.3; the roller 2.4.1 and the guide wheel 2.4.2 are rotatably arranged inside the sliding frame 2.4.3 along the length direction of the sliding frame 2.4.3, such as Figure 6 to Figure 7 As shown, the length of the sliding member 2.4 is increased so that the sliding member 2.4 will not shake when sliding inside the slide rail 1.1. In this embodiment, the sliding frame 2.4.3 includes an upper plate body and a lower plate body, the roller 2.4.1 is located between the upper plate body and the lower plate body, the connecting sleeve 2.4.4 is threadedly connected to the first rod body 2.1, and the outer sleeve of the connecting sleeve 2.4.4 is provided with a sleeve 2.4.5, and the sleeve 2.4.5 and the connecting sleeve 2.4.4 are clearance-matched, and the roller 2.4.1 and the sleeve 2.4.5 are clearance-matched, so as to realize the rotation of the roller 2.4.1. The top of the connecting sleeve 2.4.4 is provided with a boss, which is clamped on the top of the upper plate to prevent the connecting sleeve 2.4.4 from rotating. The first rod body 2.1 is equipped with a gasket and a nut in contact with the lower surface of the lower plate. The sleeve 2.4.5 can be replaced by a bearing. The installation method of the guide wheel 2.4.2 is similar to that of the roller 2.4.1, but it is connected to the connecting sleeve 2.4.4 by a fixing bolt. In order to ensure the wear resistance and rust prevention of the parts, the material of the roller 2.4.1 and the guide wheel 2.4.2 is quenched with 14Cr17Ni2, with a hardness of HRC38-42; the sleeve 2.4.5 is made of copper alloy, and the sliding frame 2.4.3 and the connecting sleeve 2.4.4 are made of stainless steel.

[0052] There is a gap of 0.1 mm to 0.2 mm between the rolling surface of the roller 2.4.1 and the rolling surface of the guide wheel 2.4.2 to avoid mutual interference between the roller 2.4.1 and the guide wheel 2.4.2 when they rotate.

[0053] The resistance wheel 3 includes a resistance wheel body 3.1 and a resistance wheel shaft 3.2. The resistance wheel body 3.1 is sleeved on the resistance wheel shaft 3.2 and the resistance wheel body 3.1 rotates around the resistance wheel shaft 3.2, so that the second rod 2.2 can pass over the resistance wheel 3. The resistance wheel shaft 3.2 is connected to the cabin frame 4 through the mounting plate 3.3. Figure 5 and Figure 8 As shown. In this embodiment, a total of four resistance wheels 3 are provided, which are used to provide locked-in-place hand-feel signals for the four dead-point locking positions of the two movable doors 5. The mounting plate 3.3 is first welded to the cabin frame 4, and then the four resistance wheel shafts 3.2 are respectively welded to the mounting plate 3.3. In this embodiment, the thickness of the mounting plate 3.3 is 12 mm. On the one hand, the combined processing can ensure the accurate position and size of the resistance wheel shaft 3.2. On the other hand, it can strengthen the rigidity of the cabin frame 4 to avoid deformation and skewing of the resistance wheel shaft 3.2 after a period of use, and the failure of the resistance wheel 3 function. The materials of the resistance wheel body 3.1, the resistance wheel shaft 3.2 and the mounting plate 3.3 are all made of stainless steel.

[0054] The method of using the above-mentioned vehicle front opening and closing mechanism is as follows: when opening the movable door, the third rod 2.3 is rotated counterclockwise by cooperating with the hexagonal prism 2.3.1 through the wrench, and the rocker arm 1 is rotated clockwise under the action of the sliding frame 2.4 to open the movable door 5. When it is about to reach the dead point locking position, the second rod 2.2 contacts the resistance wheel 3 at the corresponding position. The operator feels the signal that it is about to be locked in place, and increases the torque to rotate the third rod 2.3. When the first end of the second rod 2.2 passes over the resistance wheel 3, under the action of the elastic member 2.2.2, the sliding member 2.4 quickly rushes to the stopper 1.1.1, making a clear impact sound, and the movable door 5 is locked in place. When closing the movable door, the operation method is the same as that of opening the movable door 5, except that the third rod 2.3 should be rotated clockwise by the wrench at this time.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A head opening and closing mechanism, characterized in that: It comprises a rocker arm (1), a locking rod (2) and a resistance wheel (3); the rocker arm (1) is connected to the movable door, and one end of the rocker arm (1) away from the movable door is hinged to the cabin frame, and the movable door is opened and closed by rotating the rocker arm (1); The locking rod (2) comprises a first rod body (2.1), a second rod body (2.2) and a third rod body (2.3); the first end of the second rod body (2.2) is vertically connected to the first rod body (2.1), and the second end of the second rod body (2.2) is vertically connected to the third rod body (2.3), so as to form a Z-shaped structure; a rotatable sliding member (2.4) is provided at one end of the first rod body (2.1) away from the second rod body (2.2); a slide rail (1.1) cooperating with the sliding member (2.4) is provided on the rocker arm (1); the third rod body (2.3) is hingedly connected to the cabin frame, and the rocker arm (1) is driven to rotate by rotating the third rod body (2.3); The resistance wheel (3) is arranged on the cabin frame and is located on the rotation track of the first end of the second rod body (2.2), and is used to form resistance on the first end of the second rod body (2.2) when the locking rod (2) and the rocker arm (1) are about to form a dead point locking position; The second rod body (2.2) comprises a telescopic rod body (2.2.1) and an elastic member (2.2.2) sleeved on the telescopic rod body (2.2.1); the telescopic rod body (2.2.1) comprises two cylinders capable of relative sliding, and the two cylinders are provided with position limiting members for limiting the two ends of the elastic member (2.2.2); the first end of the telescopic rod body (2.2.1) is fixedly connected to the first rod body (2.1); the second end of the telescopic rod body (2.2.1) is fixedly connected to the third rod body (2.3); the second rod body (2.2) passes over the resistance wheel (3) by compressing the telescopic rod body (2.2.1); The first end of the second rod body (2.2) is an arc end, which facilitates the first end of the second rod body (2.2) to pass over the resistance wheel (3); A stopper (1.1.1) is provided at the end of the slide rail (1.1), and the stopper (1.1.1) collides with the sliding member (2.4) to generate a locking signal.

2. A vehicle head opening and closing mechanism according to claim 1, characterized in that: One end of the third rod (2.3) away from the second rod (2.2) extends out of the cabin frame, and a hexagonal prism (2.3.1) that cooperates with a wrench is provided at the free end of the third rod (2.3) extending out of the cabin frame.

3. A vehicle head opening and closing mechanism according to claim 1, characterized in that: There is a gap of 0.1 mm to 0.2 mm between the outer surface of the sliding member (2.4) and the inner wall of the sliding rail (1.1).

4. A vehicle head opening and closing mechanism according to claim 1, characterized in that: The sliding member (2.4) comprises a roller (2.4.1) rotatably connected to the first rod body (2.1).

5. A vehicle head opening and closing mechanism according to claim 4, characterized in that: The sliding member (2.4) further comprises a guide wheel (2.4.2) and a sliding frame (2.4.3); the roller (2.4.1) and the guide wheel (2.4.2) are rotatably arranged inside the sliding frame (2.4.3) along the length direction of the sliding frame (2.4.3), so that the sliding member (2.4) will not shake when sliding inside the slide rail (1.1).

6. A vehicle head opening and closing mechanism according to claim 5, characterized in that: There is a gap of 0.1 mm to 0.2 mm between the rolling surface of the roller (2.4.1) and the rolling surface of the guide wheel (2.4.2).

7. A head opening and closing mechanism according to claim 1, characterized in that: The resistance wheel (3) comprises a resistance wheel body (3.1) and a resistance wheel rotating shaft (3.2); the resistance wheel body (3.1) is sleeved on the resistance wheel rotating shaft (3.2) and the resistance wheel body (3.1) rotates around the resistance wheel rotating shaft (3.2); and the resistance wheel rotating shaft (3.2) is connected to the cabin frame.

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