CN216861438U - Arrange through way in bogie top in - Google Patents

Abstract

The utility model discloses a through passage arranged above a bogie, which comprises a first folding shed assembly, a second folding shed assembly, an upper pedal assembly and a lower pedal assembly, wherein the first folding shed assembly comprises a plurality of rings of first folding shed cloth, a first shed cloth clamping cloth frame, a first screw frame, a first middle connecting frame and a first butt-joint frame; the lower pedal assembly is provided with two groups which are respectively positioned at two sides of the upper pedal assembly, and the lower pedal assembly comprises a first hinge and a second hinge which are connected in a hinged manner.

Description

Arrange through way of bogie top in

Technical Field

The utility model relates to a through passage arranged above a bogie, and belongs to the field of rail transit vehicles.

Background

In the prior art, the through passage is arranged at the connecting position of the carriage and the carriage, so that personnel can safely pass between the carriages, and the bogie is arranged at the bottom of the carriage and has a certain distance from the through passage. The existing through passage design has the following defects: the bogie is designed to be positioned at the joint of a carriage and the carriage in a certain rail transit high-speed vehicle, the vehicle type has strict outer contour dimension limitation, and internal net passing width and height requirements aiming at a reserved through passage area, the conventional through passage pedal structure cannot absorb vertical displacement generated by a bogie overhead spring when the vehicle runs, and the outer contour surface has no buffer protection mechanism.

Disclosure of Invention

The utility model aims to design a through passage used for a bogie right below a carriage connection part, so as to meet the requirement of a curve of up-and-down motion working conditions of adjacent carriages and a bogie air spring generated when a vehicle of the type operates, and absorb vertical displacement generated by the bogie air spring when the vehicle operates.

In order to achieve the purpose, the technical scheme of the utility model is as follows: a through passage arranged above a bogie comprises a first folding shed assembly, a second folding shed assembly, an upper pedal assembly and a lower pedal assembly, wherein the first folding shed assembly comprises a plurality of rings of first folding shed cloth, a first shed cloth clamping frame, a first screw frame, a first intermediate connecting frame and a first butt-joint frame; the second folding shed assembly comprises a plurality of rings of second folding shed cloth, a second shed cloth clamping cloth frame, a second screw frame, a second middle connecting frame and a second butt-joint frame, the adjacent second folding shed cloth is clamped and connected through the second shed cloth clamping cloth frame, the second folding shed cloth at the outermost side is fixedly connected with the second screw frame, the innermost second folding shed cloth is fixedly connected with the second middle connecting frame, the second middle connecting frame is fixedly connected with the second butt-joint frame, and the first butt-joint frame is fixedly connected with the second butt-joint frame; the upper pedal assembly is fixedly connected with the first butt-joint frame assembly and the second butt-joint frame assembly, the upper pedal assembly comprises a middle pedal and side pedals which are respectively hinged to two sides of the middle pedal, and the side pedals are lapped on the lower pedal assembly; the lower pedal assemblies are provided with two groups and are respectively positioned on two sides of the upper pedal assembly, the lower pedal assemblies comprise a first hinge and a second hinge which are connected in a hinged mode, the second hinge is respectively fixed on the vehicle body, and the first hinge is respectively and freely overlapped on the first folding shed assembly and the second folding shed assembly.

Preferably, first canopy assembly still includes first intermediate junction frame sealing strip, first butt joint frame sealing strip, first bottom anticollision rubber strip, first footboard supporting seat and the wear-resisting piece of first footboard support down, first intermediate junction frame sealing strip is located between first intermediate junction frame and the first butt joint frame are constituteed, and first butt joint frame sealing strip is located the first butt joint frame and constitutes the outside, and first bottom anticollision rubber strip is located first intermediate junction frame bottom, and first footboard supporting seat links firmly on first butt joint frame is constituteed for fixed footboard assembly, and the wear-resisting piece of first footboard support is used for first folding page or leaf overlap joint to lean on. First intermediate junction frame sealing strip and first butt joint frame sealing strip are used for improving through way leakproofness, and first bottom anticollision rubber strip is used for buffering through the vertical displacement that the overhead spring of saying bottom steering produces under some operating modes.

Preferably, the second folding shed assembly further comprises a second middle connecting frame sealing strip, a second butt-joint frame sealing strip, a second bottom anti-collision rubber strip, a second upper pedal supporting seat and a second lower pedal supporting wear-resistant block, the second middle connecting frame sealing strip is located between the second middle connecting frame and the second butt-joint frame, the second butt-joint frame sealing strip is located on the outer side of the second butt-joint frame, the second bottom anti-collision rubber strip is located at the bottom of the second middle connecting frame, the second upper pedal supporting seat is fixedly connected to the second butt-joint frame for fixing the upper pedal assembly, and the second lower pedal supporting wear-resistant block is used for abutting against another group of first folding joints. The second middle connecting frame sealing strip and the second butt-joint frame sealing strip are used for improving the sealing performance of the through passage, and the second bottom anti-collision rubber strip is used for buffering the vertical displacement of a bogie spring at the bottom of the through passage under certain working conditions.

Preferably, the adjacent end parts of the first butt joint frame assembly and the second butt joint frame assembly are provided with a slidable locking mechanism, the second butt joint frame assembly is provided with a locking hook oppositely, the inner side parts of the first butt joint frame assembly and the second butt joint frame assembly are provided with side part anti-collision assemblies, the lower part of the end part of the first butt joint frame assembly is provided with a positioning pin, and the positioning pin is assembled with a positioning hole formed by the second butt joint frame assembly. The first butt joint frame assembly and the second butt joint frame assembly are locked with the lock hook through the locking mechanism, and the connection is compact and firm.

Preferably, the locking mechanism comprises a locking plate and a handle, the handle is fixedly connected with the locking plate, and a locking groove matched with the locking hook is formed in the locking plate. The operating handle can make the locking plate slide, and the locked groove is locked with the latch hook cooperation.

Preferably, the upper pedal assembly further comprises a hinge and an upper rubber blocking strip, the side pedal is hinged with the middle pedal through the hinge, the upper rubber blocking strip is fixedly connected to the side portion of the middle pedal through a bolt, and the end portion of the middle pedal is further provided with a wear strip. The two side pedals are connected with the middle pedal into a whole through the hinge, so that the upper pedal has the capability of absorbing vertical displacement.

Preferably, the lower pedal assembly further comprises a lower rubber stopper strip assembly and a lower pedal support seat, the lower rubber stopper strip assembly is located at two ends of the first hinge, and the lower pedal support seat is used for being fixed on the vehicle body. The connection rigidity is guaranteed, and meanwhile, the wear-resisting effect is achieved.

After the structure is adopted, the double-folding-shed assembly is adopted for locking connection and is installed right above the bogie after being connected, the upper pedal assembly comprises side pedals which are respectively hinged to two sides of the middle pedal, the two groups of lower pedals are respectively positioned on two sides of the upper pedal assembly, and the lower pedal assembly comprises a first hinge and a second hinge which are connected in a hinged mode. Therefore, the hinge structure of the side pedal and the hinge can absorb the vertical displacement generated by the bogie spring when the vehicle runs.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of the connection of the first docking frame assembly and the second docking frame assembly of FIG. 1;

FIG. 4 is an enlarged view of portion A of FIG. 2;

FIG. 5 is an enlarged view of portion B of FIG. 2;

FIG. 6 is an exploded view of the upper pedal assembly of FIG. 1;

FIG. 7 is a top view of the lower pedal assembly of FIG. 1;

FIG. 8 is a left side view of FIG. 7;

FIG. 9 is a perspective view of the locking mechanism;

FIG. 10 is a state diagram under normal vehicle conditions;

fig. 11 is a schematic view of absorbing vertical displacement.

Detailed Description

The present invention will be described in further detail with reference to the following examples, which are given in conjunction with the accompanying drawings.

Referring to fig. 1 to 8, a through passage disposed above a bogie includes a first bellows assembly 1, a second bellows assembly 2, an upper pedal assembly 3, and a lower pedal assembly 4, the first bellows assembly 1 includes a three-ring first bellows cloth 1-1, the first greenhouse cloth clamping frame 1-2, the first screw frame 1-3, the first middle connecting frame 1-4 and the first butt-joint frame form 1-5, adjacent first greenhouse cloth 1-1 are clamped and connected through the first greenhouse cloth clamping frame 1-2, the first greenhouse cloth 1-1 on the outermost side is fixedly connected with the first screw frame 1-3, the first greenhouse cloth 1-1 on the innermost side is fixedly connected with the first middle connecting frame 1-4, and the first middle connecting frame 1-4 and the first butt-joint frame form 1-5 bolts for fixing. The anti-collision device also comprises a first middle connecting frame sealing strip 1-6, a first butt-joint frame sealing strip 1-7, a first bottom anti-collision rubber strip 1-8, a first upper pedal supporting seat 1-9 and a first lower pedal supporting wear-resistant block 1-10, wherein the first middle connecting frame sealing strip 1-6 is positioned between the first middle connecting frame 1-4 and the first butt-joint frame assembly 1-5, the first butt-joint frame sealing strip 1-7 is positioned on the outer side of the first butt-joint frame assembly 1-5, the first bottom anti-collision rubber strip 1-8 is positioned at the bottom of the first middle connecting frame 1-4, the first upper pedal supporting seat 1-9 is fixedly connected on the first butt-joint frame assembly 1-5, for securing the upper pedal assembly 3 and a first lower pedal support wear block 1-10 for the first hinge 4-1 to lap against.

Referring to fig. 4, the first tarpaulin 1-1 is a flexible body having a through passage for absorbing displacement in various directions generated when the vehicle body is operated. Three rings are provided, each ring comprises an inner layer of shed cloth and an outer layer of shed cloth, and a layer of sound absorption material is clamped between the inner layer of shed cloth and the outer layer of shed cloth, so that the sound insulation and heat insulation performance is improved. The adjacent tarpaulins are connected through the first tarpaulin clamping frames 1-2, so that the rigidity of the flexible tarpaulin body is increased. The first screw frame 1-3 is one of vehicle end interfaces, one side of which is provided with a clamping opening and is clamped and connected with the shed cloth at the outermost side into a whole, and the other side of which is fixed on the vehicle end wall through a stud. The first middle connecting frame 1-4 is used for connecting the first folding shed cloth 1-1 and the first butt-joint frame assembly 1-5, one side of the first middle connecting frame is provided with a clamping opening and is clamped and connected with the innermost shed cloth into a whole, and the other side of the first middle connecting frame is connected with the first butt-joint frame assembly 1-5 through screws. The first middle connecting frame sealing strips 1-6 are arranged between the first middle connecting frames 1-4 and the first butt-joint frame assemblies 1-5 and used for improving the sealing performance of the through passage, and step notches are reserved at the bottoms of the first middle connecting frame sealing strips. The first butt joint frame sealing strips 1-7 are arranged on the first butt joint frame to form 1-5 pairs of locking joint surfaces and used for providing sealing performance after the two folding shed assemblies are locked. The bottom first bottom anti-collision rubber strips 1-8 are used for buffering vertical displacement of a through passage bottom bogie spring under certain working conditions, step notches are also formed in two ends of the bottom first bottom anti-collision rubber strips, the two ends of the bottom first bottom anti-collision rubber strips are matched with the bottom step notches of the first middle connecting frame sealing strips 1-6, the bottom first bottom anti-collision rubber strips are fixed with the first middle connecting frames 1-4 through bolts formed by the first butt-joint frames 1-5, and sealant is coated at step joints to enhance sealing performance after installation.

Referring to fig. 5, the second folding shed assembly 2 has the same overall structure as the first folding shed assembly 1, the second folding shed assembly 2 comprises three rings of second folding shed cloth 2-1 and second shed cloth clamping frames 2-2, the second screw frames 2-3, the second middle connecting frames 2-4 and the second butt-joint frames form 2-5, adjacent second shed cloth 2-1 are clamped and connected through the second shed cloth clamping frame 2-2, the second shed cloth 2-1 at the outermost side is fixedly connected with the second screw frames 2-3, the second shed cloth 2-1 at the innermost side is fixedly connected with the second middle connecting frames 2-4, the second middle connecting frames 2-4 are fixedly connected with the second butt-joint frames 2-5, and the first butt-joint frame assembly 1-5 is fixedly connected with the second butt-joint frame assembly 2-5; the second folding shed assembly 2 also comprises a second middle connecting frame sealing strip 2-6, a second butt-joint frame sealing strip 2-7, a second bottom anti-collision rubber strip 2-8, a second upper pedal supporting seat 2-9 and a second lower pedal supporting wear-resistant block 2-10, the second middle connecting frame sealing strip 2-6 is positioned between the second middle connecting frame 2-4 and the second butt-joint frame assembly 2-5, the second butt-joint frame sealing strip 2-7 is positioned at the outer side of the second butt-joint frame assembly 2-5, the second bottom anti-collision rubber strip 2-8 is positioned at the bottom of the second middle connecting frame 2-4, the second upper pedal supporting seat 2-9 is fixedly connected on the second butt-joint frame assembly 2-5, for securing the upper pedal assembly 3 and the second lower pedal supporting wear blocks 2-10 for another set of first hinges 4-1 to lap against.

Referring to fig. 6, the upper pedal assembly 3 is fixedly connected with the first butt-joint frame assembly 1-5 and the second butt-joint frame assembly 2-5, the upper pedal assembly 3 comprises a middle pedal 3-1 and side pedals 3-2 respectively hinged to two sides of the middle pedal 3-1, and the side pedals 3-2 are lapped on the lower pedal assembly 4. The pedal is characterized by further comprising hinges 3-3 and upper rubber barrier strips 3-4, the side pedals 3-2 are hinged with the middle pedal 3-1 through the hinges 3-3, the upper rubber barrier strips 3-4 are fixedly connected to the side portion of the middle pedal 3-1 through bolts, and the end portion of the middle pedal 3-1 is further provided with abrasion strips 3-5.

The middle pedal 3-1 is provided with mounting holes which are connected to a first upper pedal supporting seat 1-9 of the first folding shed assembly 1 and a second upper pedal supporting seat 2-9 of the second folding shed assembly 2 through screws. The two side pedals 3-2 are connected with the middle pedal 3-1 into a whole through the hinges 3-3, so that the upper pedal has the capability of absorbing vertical displacement. The upper rubber barrier strips 3-4 are integrally formed by EPDM and stainless steel plates, the side of each stainless steel plate is connected to the middle pedal 3-1 and the side pedals 3-2 through bolts, and the side of the EPDM can contact the cloth cover of the folding shed to play a role in wear resistance. The wearing strip 3-5 is made of nylon materials and is arranged at the outer end of the side pedal 3-2, and the bottom of the wearing strip is lapped on the lower pedal assembly 4.

Referring to fig. 7 and 8, the lower pedal assembly 4 has two sets, which are respectively located at two sides of the upper pedal assembly 3, and the lower pedal assembly 4 includes a first hinge 4-1 and a second hinge 4-2 that are hinged to each other, the second hinge 4-2 is respectively fixed on the vehicle body, and the first hinge 4-1 is respectively and freely overlapped on the first folding shed assembly 1 and the second folding shed assembly 2. The lower pedal assembly 4 further comprises a lower rubber barrier strip assembly 4-3 and a lower pedal support seat 4-4, wherein the lower rubber barrier strip assembly 4-3 is positioned at two ends of the first hinge 4-1, and the lower pedal support seat 4-4 is used for being fixed on a vehicle body. The first hinge 4-1 and the second hinge 4-2 form a complete hinge, and the hinge enables the lower pedal assembly 4 to absorb vertical displacement generated by a bogie overhead spring because the bogie is positioned right below the through passage, and a schematic diagram is shown in fig. 11. Two groups of first hinges 4-1 are respectively lapped on the first lower pedal supporting wear-resistant block 1-10 and the second lower pedal supporting wear-resistant block 2-10 at the free ends, and the second hinges 4-2 are fixed on the vehicle body interface at the same side through lower pedal supporting seats 4-4. In order to avoid unacceptable interference, curve analysis is carried out according to the running route of the vehicle, and the outline of the second folding page 4-2 is finally determined by combining the positions of all parts of the through passage. The lower rubber stop strip assembly 4-3 is integrally formed by rubber and a stainless steel plate, the rubber side is in contact with the shed cloth, and the stainless steel side is fixed to the first folding sheet 4-1. The connection rigidity is guaranteed, and meanwhile, the wear-resisting effect is achieved. The lower pedal supporting seat 4-4 is a component for connecting the pedal and the vehicle body, a bottom hole is used for being connected and fixed to the vehicle body through bolts, and a top hole is used for being connected with the second hinge 4-2 through bolts.

Referring to fig. 3 and 9, the adjacent end parts of the first butt joint frame assembly 1-5 and the second butt joint frame assembly 2-5 are provided with a slidable locking mechanism 1-5-1, the second butt joint frame assembly 2-5 is oppositely provided with a locking hook 1-5-4, the inner side parts of the first butt joint frame assembly 1-5 and the second butt joint frame assembly 2-5 are respectively provided with a side part anti-collision assembly 1-5-2, the lower part of the end part of the first butt joint frame assembly 1-5 is provided with a positioning pin 1-5-3, and the positioning pins 1-5-3 are assembled with positioning holes of the second butt joint frame assembly 2-5. The locking mechanism 1-5-1 comprises a locking plate 1-5-1-1 and a handle 1-5-1-2, the handle 1-5-1-2 is fixedly connected with the locking plate 1-5-1-1, and a locking groove 1-5-1-3 matched with the locking hook 1-5-4 is arranged on the locking plate 1-5-1-1. The inner side of one end of the frame body of the first butt joint frame assembly 1-5 in the length direction is provided with a closed cavity for the lock plate 1-5-1-1 to slide, and the lock groove 1-5-1-3 can slide up and down along with the lock plate 1-5-1-1 in the closed cavity within a certain stroke range by operating the handle 1-5-1-2. The outer side of the other end of the frame body of the first butt joint frame assembly 1-5 in the length direction is also provided with a fixed lock hook 1-5-4, and the opposite side of the second butt joint frame assembly 2-5 is provided with a lock groove position which can be locked. When the through passage is hung, the positioning pins 1-5-3 in the first folding shed assembly 1 can be pre-aligned with the positioning holes in the second folding shed assembly 2, the locking hooks 1-5-4 are aligned with the locking grooves 1-5-1-3 one by one, then the handle 1-5-1-2 is rotated to push the locking plate 1-5-1-1 to slide from top to bottom until the root parts of the locking hooks 1-5-4 are clamped by the locking grooves 1-5-1-3. The locking mechanism has the advantages of fewer components, flexibility and reliability, and the locking plate can not be separated from the sliding track of the locking plate.

Referring to fig. 10, the vehicle is in a running state under normal operating conditions, and the lower part of the upper pedal assembly 3 is a bogie. When the bogie spring is required to make vertical displacement in the carriage under the stress state, the articulated structure of the upper pedal assembly 3 and the lower pedal assembly 4 can absorb the vertical displacement generated by the bogie spring when the vehicle runs, and the bogie spring deforms to the state shown in fig. 11.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various changes and modifications without departing from the inventive concept, and these changes and modifications are all within the scope of the present invention.

Claims (7)

1. The utility model provides an arrange through of bogie top in says, includes first pergola assembly (1), second pergola assembly (2), goes up footboard assembly (3) and lower footboard assembly (4), its characterized in that: the first folding shed assembly (1) comprises a plurality of rings of first folding shed cloth (1-1), first shed cloth clamping cloth frames (1-2), first screw frames (1-3), first middle connecting frames (1-4) and first butt joint frame assemblies (1-5), adjacent first folding shed cloth (1-1) are clamped and connected through the first shed cloth clamping cloth frames (1-2), the first folding shed cloth (1-1) on the outermost side is fixedly connected with the first screw frames (1-3), the first folding shed cloth (1-1) on the innermost side is fixedly connected with the first middle connecting frames (1-4), and the first middle connecting frames (1-4) are fixedly connected with the first butt joint frame assemblies (1-5);

the second folding shed assembly (2) comprises a plurality of rings of second folding shed cloth (2-1), second shed cloth clamping cloth frames (2-2), second screw frames (2-3), second middle connecting frames (2-4) and second butt joint frame assemblies (2-5), adjacent second folding shed cloth (2-1) are clamped and connected through the second shed cloth clamping cloth frames (2-2), the second folding shed cloth (2-1) on the outermost side is fixedly connected with the second screw frames (2-3), the second folding shed cloth (2-1) on the innermost side is fixedly connected with the second middle connecting frames (2-4), and the second middle connecting frames (2-4) are fixedly connected with the second butt joint frame assemblies (2-5), the first butt joint frame assembly (1-5) is fixedly connected with the second butt joint frame assembly (2-5);

the upper pedal assembly (3) is fixedly connected with the first butt joint frame assembly (1-5) and the second butt joint frame assembly (2-5), the upper pedal assembly (3) comprises a middle pedal (3-1) and side pedals (3-2) which are respectively hinged to two sides of the middle pedal (3-1), and the side pedals (3-2) are lapped on the lower pedal assembly (4);

the lower pedal assemblies (4) are provided with two groups and are respectively positioned on two sides of the upper pedal assembly (3), the lower pedal assemblies (4) comprise a first hinge (4-1) and a second hinge (4-2) which are hinged, the second hinge (4-2) is respectively fixed on the vehicle body, and the first hinge (4-1) is respectively and freely overlapped on the first folding shed assembly (1) and the second folding shed assembly (2).

2. A through passage disposed above a truck according to claim 1, wherein: the first folding shed assembly (1) further comprises a first middle connecting frame sealing strip (1-6), a first butt-joint frame sealing strip (1-7), a first bottom anti-collision rubber strip (1-8), a first upper pedal supporting seat (1-9) and a first lower pedal supporting wear-resistant block (1-10), the first middle connecting frame sealing strip (1-6) is positioned between the first middle connecting frame (1-4) and the first butt-joint frame assembly (1-5), the first butt-joint frame sealing strip (1-7) is positioned on the outer side of the first butt-joint frame assembly (1-5), the first bottom anti-collision rubber strip (1-8) is positioned at the bottom of the first middle connecting frame (1-4), the first upper pedal (1-9) is fixedly connected to the first butt-joint frame assembly (1-5) and used for fixing the upper pedal assembly (3), the first lower pedal supporting wear-resistant block (1-10) is used for the first hinge (4-1) to be lapped and abutted.

3. A through passage disposed above a truck according to claim 1, wherein: the second folding shed assembly (2) further comprises a second middle connecting frame sealing strip (2-6), a second butt-joint frame sealing strip (2-7), a second bottom anti-collision rubber strip (2-8), a second upper pedal supporting seat (2-9) and a second lower pedal supporting wear-resistant block (2-10), the second middle connecting frame sealing strip (2-6) is positioned between the second middle connecting frame (2-4) and the second butt-joint frame assembly (2-5), the second butt-joint frame sealing strip (2-7) is positioned on the outer side of the second butt-joint frame assembly (2-5), the second bottom anti-collision rubber strip (2-8) is positioned at the bottom of the second middle connecting frame (2-4), and the second upper pedal supporting seat (2-9) is fixedly connected to the second butt-joint frame assembly (2-5) and used for fixing the upper pedal assembly (3), the second lower pedal supports the wear blocks (2-10) for the overlapping abutment of the first flaps (4-1) of the other group.

4. A through passage disposed above a truck according to claim 1, wherein: the adjacent end parts of the first butt joint frame assembly (1-5) and the second butt joint frame assembly (2-5) are provided with a slidable locking mechanism (1-5-1), the second butt joint frame assembly (2-5) is provided with a locking hook (1-5-4) oppositely, the inner side parts of the first butt joint frame assembly (1-5) and the second butt joint frame assembly (2-5) are provided with side part anti-collision assemblies (1-5-2), the lower part of the end part of the first butt joint frame assembly (1-5) is provided with a positioning pin (1-5-3), and the positioning pin (1-5-3) and the positioning hole of the second butt joint frame assembly (2-5) are assembled.

5. A through passage disposed above a truck according to claim 4, wherein: the locking mechanism (1-5-1) comprises a locking plate (1-5-1-1) and a handle (1-5-1-2), the handle (1-5-1-2) is fixedly connected with the locking plate (1-5-1-1), and a locking groove (1-5-1-3) matched with the locking hook (1-5-4) is formed in the locking plate (1-5-1-1).

6. A through passage disposed above a truck according to claim 1, wherein: the upper pedal assembly (3) further comprises a hinge (3-3) and an upper rubber stop strip (3-4), the side pedal (3-2) is hinged with the middle pedal (3-1) through the hinge (3-3), the upper rubber stop strip (3-4) is fixedly connected to the side portion of the middle pedal (3-1) through a bolt, and the end portion of the middle pedal (3-1) is further provided with a wear strip (3-5).

7. A through passage disposed above a truck according to claim 1, wherein: the lower pedal assembly (4) further comprises a lower rubber stop strip assembly (4-3) and a lower pedal supporting seat (4-4), the lower rubber stop strip assembly (4-3) is located at two ends of the first hinge (4-1), and the lower pedal supporting seat (4-4) is used for being fixed on a vehicle body.

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