A kind of highway construction and maintenance equipment

Abstract

The present invention discloses a highway construction and maintenance device, belonging to the technical field of pavement maintenance equipment. The device comprises a vehicle frame, a pavement milling structure fixedly mounted on the front end of the vehicle frame, the pavement milling structure being fixedly connected to a gravel collecting device, a fixedly connected milling pavement hammering structure provided at the end of the vehicle frame, and the gravel collecting device being disposed between the pavement milling structure and the milling pavement hammering structure. In order to quickly compact the pavement after milling and prevent the falling of soil and rocks at the edges of milled potholes, the present invention provides a highway construction and maintenance device. While compacting the potholes after milling, the device also pushes and presses the loose soil and rocks at the edges of the pit, thereby stabilizing the pit edge and facilitating the stable connection of subsequently poured concrete with the original concrete in the pit.

Description

Technical Field

[0001] The present invention belongs to the technical field of road maintenance equipment, and in particular relates to a highway construction and maintenance equipment. Background Art

[0002] Highway pavement maintenance includes road cleaning, crack treatment, pothole repair, pavement milling and surface covering. When the pavement is severely damaged, such as cracks within a certain range and accompanied by pavement subsidence, the area should be milled in time and the asphalt concrete surface layer should be repaved.

[0003] During the pavement maintenance process, construction workers use hammering to crush the damaged pavement, then arrange workers to shovel out the gravel, and finally compact the damaged foundation. This series of operations is highly dependent on manpower, so improvements need to be made to the current pavement milling equipment. Summary of the Invention

[0004] In view of the above situation, in order to quickly compact the road surface after planing and milling and prevent the soil and rocks at the edge of the milled potholes from falling, the present invention provides a highway construction and maintenance equipment, which not only compacts the potholes after planing and milling, but also pushes and presses the loose soil and rocks at the edge of the tunnel, making the edge of the tunnel stable, which is conducive to the stable connection of the subsequently poured concrete with the original concrete in the tunnel.

[0005] The technical solution adopted by the present invention is as follows: The present invention provides a highway construction and maintenance equipment, including a frame, a road milling structure fixedly installed on the front end of the frame, the road milling structure is fixedly connected to a gravel collection device, the end of the frame is provided with a fixedly connected milling road hammer structure, and the gravel collection device is arranged between the road milling structure and the milling road hammer structure; the milling road hammer structure includes a hammer pushing structure and a reciprocating hammer structure, the reciprocating hammer structure is fixedly installed on the frame, and the hammer pushing structure is connected to the reciprocating hammer structure.

[0006] Furthermore, the reciprocating hammer structure includes a crank, a connecting rod, a connecting bracket, an articulated bracket, a slide, a sleeve, a belt, a belt shaft and a motor. The motor is fixedly installed in the road milling structure, the slide and the road milling structure are fixedly connected via a bracket, the belt shaft is engaged and rotatably arranged on a bracket fixedly connected to the slide, the belt is connected between the motor and the belt shaft, and the belt shaft is driven to rotate by the motor, the crank is fixedly connected to the belt shaft, and the rotation of the belt shaft drives the crank to rotate, the connecting rod is engaged and rotatably connected to the crank, the connecting bracket is fixedly connected to the connecting rod, the connecting bracket slides up and down along the slide, the sleeve is fixedly installed on the hammer pressing and pushing structure, the articulated bracket is fixedly installed on the side wall of the sleeve, and the connecting bracket is connected to the articulated bracket.

[0007] Furthermore, the hammer-pressing flat-pushing structure includes a hard hammer, a soft hammer base, a side push plate, a push plate engaging flat groove, a flat groove engaging bracket, a vertical slot, a horizontal push bending plate, and a bending plate slide. The hard hammer is fixedly installed on the bottom wall of the sleeve, the soft hammer base is fixedly installed on the bottom wall of the hard hammer, the push plate engaging flat groove is arranged on the side wall of the hard hammer, and the flat groove engaging bracket slides horizontally along the push plate engaging flat groove to ensure that the side push plate moves horizontally relative to the hard hammer when it moves horizontally. The side push plate is fixedly installed on the flat groove engaging bracket, the vertical slot is fixedly arranged on the top wall of the hard hammer, the bending plate slide is fixedly arranged in the hard hammer, the horizontal push bending plate slides horizontally along the bending plate slide, and the horizontal push bending plate is fixedly installed on the side push plate.

[0008] Furthermore, a limit column and a transverse push column connected by threads are provided on the bottom wall of the frame. The limit column is connected to the sleeve by snap-fitting and sliding. The transverse push column is snap-fitting and sliding along the vertical slot, and the bottom wall of the transverse push column is in contact with the transverse push bending plate.

[0009] Preferably, the contact surfaces of the transverse push bending plate and the transverse push column are both set as inclined surfaces. When the hard hammer moves upward, the transverse push column squeezes the transverse push bending plate and makes the transverse push bending plate slide horizontally. When the hard hammer slides down and separates from the transverse push column, the transverse push bending plate drives the side push plate to slide away from the hard hammer. A spring is provided between the side push plate and the hard hammer to ensure that the side push plate will slide horizontally when the transverse push bending plate separates from the transverse push column.

[0010] Furthermore, the road milling structure includes a milling drum, a drum baffle, a second belt, a motor box, a second motor, a belt baffle, and a sinking cylinder. The sinking cylinder is fixedly mounted on the vehicle frame, and the motor box is fixedly connected to the sinking cylinder. When the sinking cylinder is extended, the motor box moves downward, and the gravel collection device and the milling road hammer structure move downward together. Motor 2 and motor 1 are fixedly installed in the motor box, and the drum baffle is fixedly connected to the motor box through a bracket. The milling drum is engaged and rotatably arranged in the drum baffle. The two ends of the belt two are sleeved on the motor two and the milling drum, and the kinetic energy of the motor two is transmitted to the milling drum below through the belt two, so that the milling drum mills the ground. The two ends of the belt baffle are fixedly connected to the drum baffle and the motor box respectively.

[0011] Preferably, a baffle 1 is provided on the outside of the belt 1.

[0012] Furthermore, the surface of the milling drum is provided with hook-shaped protrusions.

[0013] Furthermore, the gravel collecting device includes a gravel collecting shovel and a collecting telescopic cylinder. The collecting telescopic cylinder is fixedly mounted on the motor box, and the gravel collecting shovel is fixedly connected to the collecting telescopic cylinder.

[0014] Preferably, the bottom wall of the gravel collecting shovel is set as an inclined surface. After the gravel enters the gravel collecting shovel, as the equipment moves, more small stones enter the gravel collecting shovel, and the gravel at the rear end pushes and squeezes the gravel at the front end to move deeper into the gravel collecting shovel, making it convenient to collect stones on the ground.

[0015] Furthermore, the frame includes rollers, side wall brackets, and a top plate. The rollers roll along the ground. A sinking cylinder is provided on the bottom wall of the top plate. The side wall brackets are fixedly mounted on the side walls of the top plate. The rollers are engaged and rotatably mounted on the side wall brackets.

[0016] Furthermore, a protrusion is provided on the outer wall of the belt baffle, and the protrusion is engaged with the side wall bracket, which can play a stabilizing role when the motor box moves up and down.

[0017] This solution provides a highway construction and maintenance equipment, which has the following beneficial effects:

[0018] After the milling drum destroys the road surface, it collects the soil and rocks in the tunnel and compacts the foundation at the bottom of the tunnel. The most important thing is that while compacting the foundation, the thrust between the horizontal push column and the horizontal push bending plate is used to make the side push plate obtain a horizontal thrust, so that the side push plate can push the soil and rocks at the edge of the milling pit, thereby building a relatively stable tunnel structure for the subsequent pouring of asphalt. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A rear perspective view of a highway construction and maintenance equipment provided by the present invention;

[0020] Figure 2 An exploded diagram of a highway construction and maintenance equipment provided by the present invention;

[0021] Figure 3 A main perspective view of a highway construction and maintenance equipment provided by the present invention;

[0022] Figure 4 A right side sectional view of a highway construction and maintenance device provided by the present invention in use;

[0023] Figure 5 A right side sectional view of a highway construction and maintenance equipment provided by the present invention;

[0024] Figure 6 This is a schematic diagram of the internal structure of the hammer-pressing and pushing structure;

[0025] Figure 7 A front perspective view of a highway construction and maintenance equipment provided by the present invention;

[0026] Figure 8 A schematic diagram of the internal structure of a highway construction and maintenance equipment provided by the present invention;

[0027] Figure 9 It is a three-dimensional cross-sectional view of the hammer structure for milling the road surface.

[0028] Among them, 1. Road milling structure, 2. Gravel collection device, 3. Milling road hammer structure, 4. Hammer flat push structure, 5. Reciprocating hammer structure, 6. Crank, 7. Connecting rod, 8. Connecting bracket, 9. Articulated bracket, 10. Slide, 11. Sleeve, 12. Belt 1, 13. Belt shaft 1, 14. Motor 1, 15. Hard hammer, 16. Soft hammer base, 17. Side push plate, 18. Push plate clamping flat groove, 19. Flat groove clamping support Frame, 20. Vertical slot, 21. Horizontal push bending plate, 22. Bending plate slide, 23. Limiting column, 24. Horizontal push column, 25. Milling drum, 26. Drum baffle, 27. Belt 2, 28. Motor box, 29. Motor 2, 30. Belt baffle, 31. Sinking cylinder, 32. Gravel collecting shovel, 33. Collecting telescopic cylinder, 34. Frame, 35. Roller, 36. Side wall bracket, 37. Top plate, 38. Baffle 1.

[0029] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0032] like Figures 1-9As shown, the present invention provides a highway construction and maintenance equipment, including a frame 34, a road milling structure 1 is fixedly installed on the front end of the frame 34, the road milling structure 1 is fixedly connected to the gravel collecting device 2, the end of the frame 34 is provided with a fixedly connected milling road hammering structure 3, and the gravel collecting device 2 is arranged between the road milling structure 1 and the milling road hammering structure 3; the frame 34 includes rollers 35, side wall brackets 36, and a top plate 37, a sinking cylinder 31 is provided on the bottom wall of the top plate 37, the side wall brackets 36 are fixedly installed on the side walls of the top plate 37, and the rollers 35 are engaged and rotatably installed on the side wall brackets 36.

[0033] The milling road hammer structure 3 includes a hammer push structure 4 and a reciprocating hammer structure 5. The reciprocating hammer structure 5 is fixedly mounted on the vehicle frame 34. The hammer push structure 4 is connected to the reciprocating hammer structure 5. The reciprocating hammer structure 5 includes a crank 6, a connecting rod 7, a connecting bracket 8, an articulated bracket 9, a chute 10, a sleeve 11, a belt 12, a belt shaft 13 and a motor 14. The motor 14 is fixedly mounted in the road milling structure 1. The chute 10 and the road milling structure 1 are fixed by a bracket. The two components are fixedly connected, the belt shaft 13 is engaged and rotatably arranged on a bracket fixedly connected to the slide 10, the belt 12 is sleeved between the motor 14 and the belt shaft 13, the crank 6 is fixedly connected to the belt shaft 13, the connecting rod 7 is engaged and rotatably connected to the crank 6, the connecting bracket 8 is fixedly connected to the connecting rod 7, the connecting bracket 8 slides up and down along the slide 10, the sleeve 11 is fixedly installed on the hammer pressing and pushing structure 4, the articulated bracket 9 is fixedly installed on the side wall of the sleeve 11, and the connecting bracket 8 is connected to the articulated bracket 9.

[0034] The hammer-pressing flat-pushing structure 4 includes a hard hammer 15, a soft hammer base 16, a side push plate 17, a push plate engaging flat groove 18, a flat groove engaging bracket 19, a vertical slot 20, a horizontal push bending plate 21, and a bending plate slide 22. The hard hammer 15 is fixedly installed on the bottom wall of the sleeve 11, the soft hammer base 16 is fixedly installed on the bottom wall of the hard hammer 15, the push plate engaging flat groove 18 is arranged on the side wall of the hard hammer 15, the flat groove engaging bracket 19 slides horizontally along the push plate engaging flat groove 18, the side push plate 17 is fixedly installed on the flat groove engaging bracket 19, the vertical slot 20 is fixedly set on the top wall of the hard hammer 15, the bending plate slide 22 is fixedly set in the hard hammer 15, the horizontal push bending plate 21 slides horizontally along the bending plate slide 22, and the horizontal push bending plate 21 is fixedly installed on the side push plate 17.

[0035] A limiting column 23 and a horizontal push column 24 are provided on the bottom wall of the frame 34. The limiting column 23 is engaged and slidably connected with the sleeve 11, and the horizontal push column 24 is engaged and slidably connected along the vertical slot 20, and the bottom wall of the horizontal push column 24 is in contact with and connected to the horizontal push bending plate 21.

[0036] The contact surfaces of the transverse pushing bending plate 21 and the transverse pushing column 24 are both set as inclined surfaces, and a spring is provided between the side pushing plate 17 and the hard hammer 15.

[0037] The road milling structure 1 includes a milling drum 25, a drum baffle 26, a belt 27, a motor box 28, a motor 29, a belt baffle 30, and a sinking cylinder 31. The sinking cylinder 31 is fixedly mounted on the frame 34. The motor box 28 is fixedly connected to the sinking cylinder 31. Motor 2 29 and motor 1 14 are fixedly mounted in the motor box 28. The drum baffle 26 is fixedly connected to the motor box 28 through a bracket. The milling drum 25 is engaged and rotatably arranged in the drum baffle 26. The two ends of the belt 27 are sleeved on the motor 2 29 and the milling drum 25. The two ends of the belt baffle 30 are fixedly connected to the drum baffle 26 and the motor box 28 respectively.

[0038] A baffle 38 is provided on the outside of the belt 12.

[0039] The surface of the milling drum 25 is provided with hook-shaped protrusions.

[0040] The gravel collecting device 2 includes a gravel collecting shovel 32 and a collecting telescopic cylinder 33 . The collecting telescopic cylinder 33 is fixedly mounted on the motor box 28 , and the gravel collecting shovel 32 is fixedly connected to the collecting telescopic cylinder 33 .

[0041] The bottom wall of the gravel collecting shovel 32 is formed into an inclined surface.

[0042] A protrusion is provided on the outer wall of the belt guard 30 , and the protrusion is engaged with the side wall bracket 36 .

[0043] In specific use, when the road surface cracks or sinks, the problem area should be milled;

[0044] Move the equipment to the working area that needs milling, extend the sinking cylinder 31, and the milling drum 25 contacts the cracked road surface. The motor 29 is energized, and the belt 27 slides under the drive of the motor. The belt 27 transfers the kinetic energy of the motor 29 to the milling drum 25, and the milling drum 25 rotates to crush the cracked road surface. At the same time, the vehicle body moves forward to crush the cracked road surface in the vehicle's forward path.

[0045] In order to facilitate the subsequent compaction of the roadbed, when the crushed stones produced by milling are sent out of the maintenance area, the collecting telescopic cylinder 33 is extended, the crushed stone collecting shovel 32 is lowered, and the crushed stone collecting shovel 32 contacts the stones and collects the crushed stones in the crushed stone collecting shovel 32;

[0046] When only the road surface needs to be compacted, the motor 14 is energized and rotated, and the motor 14 drives the belt 12 to slide. Since the two ends of the belt 12 are respectively connected to the motor 14 and the belt shaft 13, the belt 12 drives the belt shaft 13 to rotate, and the crank 6 is fixedly connected to the belt shaft 13, so that the rotation of the belt shaft 13 drives the crank 6 to rotate. The crank 6 rotates continuously, causing the connecting rod 7 to slide up and down along the slide groove 10. The connecting rod 7 is fixedly connected to the connecting bracket 8, and the connecting bracket 8 is connected to the articulated bracket 9. The articulated bracket 9 is fixedly installed on the sleeve 11. When the connecting rod 7 moves, the connecting bracket 8 drags the articulated bracket 9 to move, and the articulated bracket 9 drives the sleeve 11 to slide on the limiting column 23, causing the hard hammer 15 to reciprocate in the vertical direction. The soft hammer base 16 made of rubber material hammers downward reciprocatingly many times, which reduces the impact force between the equipment and the ground and effectively compacts the ground.

[0047] When it is necessary to provide a lateral thrust to the side wall of the foundation pit while compacting the foundation pit to prevent the soil and rocks around the pit from falling due to planing and milling, the horizontal push column 24 is installed in the threaded groove below the top plate 37. When the crank structure moves and drives the hard hammer 15 to make an up and down reciprocating motion, the hard hammer 15 and the horizontal push column 24 produce relative displacement. During the falling process of the hard hammer 15, the spatial position of the horizontal push column 24 remains unchanged, and the horizontal push bending plate 21 moves in the direction away from the horizontal push column 24. Under the action of the spring between the side push plate 17 and the hard hammer 15, the side push plate 17 moves in the direction away from the hard hammer 15, and the two groups of side push plates 17 on both sides of the hard hammer 15 press against the edge of the foundation pit;

[0048] During the upward movement of the hard hammer 15, the position of the horizontal push column 24 remains unchanged, and the hard hammer 15 drives the horizontal push bending plate 21 to move upward. The inclined side wall of the horizontal push bending plate 21 contacts the inclined surface of the bottom wall of the horizontal push column 24. The bottom wall of the horizontal push column 24 presses the horizontal push bending plate 21, causing the horizontal push bending plate 21 to slide horizontally. The horizontal push bending plate 21 drives the side push plate 17 to approach the direction of the hard hammer 15. At this time, the side wall of the side push plate 17 is in contact with the side wall of the hard hammer 15. Before the next movement to compact the foundation pit, the distance between the hard hammer 15 and the side push plate 17 is shortened, which is conducive to cleaning up the fallen rocks on both sides of the tunnel while compacting the foundation next time, thereby achieving the effect of compacting the tunnel while pushing the soil and rocks on both sides of the channel.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0050] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A highway construction and maintenance equipment, characterized by: The invention comprises a vehicle frame (34), a road milling structure (1) is fixedly mounted on the front end of the vehicle frame (34), the road milling structure (1) is fixedly connected to a gravel collecting device (2), a fixedly connected milling road hammering structure (3) is provided at the end of the vehicle frame (34), the gravel collecting device (2) is arranged between the road milling structure (1) and the milling road hammering structure (3); the milling road hammering structure (3) comprises a hammering flat push structure (4) and a reciprocating hammering structure (5), the reciprocating hammering structure (5) is fixedly mounted on the vehicle frame (34), and the The hammer-pressing flat-pushing structure (4) is connected to the reciprocating hammering structure (5); the reciprocating hammering structure (5) includes a sleeve (11), and the sleeve (11) is fixedly mounted on the hammer-pressing flat-pushing structure (4); the hammer-pressing flat-pushing structure (4) includes a hard hammer (15), a soft hammer base (16), a side push plate (17), a push plate engaging flat groove (18), a flat groove engaging bracket (19), a vertical slot (20), a horizontal push bending plate (21), and a bending plate slide groove (22); the hard hammer (15) is fixedly mounted on the bottom wall of the sleeve (11), and the soft hammer base (16) is fixedly mounted on the side push plate (17). On the bottom wall of the hard hammer (15), the push plate engaging flat groove (18) is set on the side wall of the hard hammer (15), the flat groove engaging bracket (19) slides horizontally along the push plate engaging flat groove (18), the side push plate (17) is fixedly installed on the flat groove engaging bracket (19), the vertical slot (20) is fixedly set on the top wall of the hard hammer (15), the bending plate slide (22) is fixedly set in the hard hammer (15), the horizontal push bending plate (21) slides horizontally along the bending plate slide (22), and the horizontal push bending plate (21) is fixedly installed on the side push plate (17) A limit column (23) and a horizontal push column (24) are provided on the bottom wall of the frame (34), the limit column (23) is engaged and slidably connected with the sleeve (11), the horizontal push column (24) is engaged and slidably connected along the vertical slot (20), and the bottom wall of the horizontal push column (24) is in contact and connected with the horizontal push bending plate (21); the contact surfaces of the horizontal push bending plate (21) and the horizontal push column (24) are both set as inclined surfaces, and a spring is provided between the side push plate (17) and the hard hammer (15); the reciprocating hammer structure (5) drives the sleeve (11) and the hard hammer (15) to move back and forth up and down.

2. The highway construction and maintenance equipment according to claim 1, characterized in that: The reciprocating hammer structure (5) comprises a crank (6), a connecting rod (7), a connecting bracket (8), a hinged bracket (9), a chute (10), a belt (12), a belt shaft (13) and a motor (14). The motor (14) is fixedly installed in the road milling structure (1). The chute (10) and the road milling structure (1) are fixedly connected via a bracket. The belt shaft (13) is rotatably mounted on the bracket fixedly connected to the chute (10). The belt 1 (12) is sleeved between the motor 1 (14) and the belt shaft 1 (13), the crank (6) is fixedly connected to the belt shaft 1 (13), the connecting rod (7) is engaged and rotatably connected to the crank (6), the connecting bracket (8) is fixedly connected to the connecting rod (7), the connecting bracket (8) slides up and down along the slide groove (10), the hinged bracket (9) is fixedly installed on the side wall of the sleeve (11), and the connecting bracket (8) is connected to the hinged bracket (9).

3. The highway construction and maintenance equipment according to claim 2, characterized in that: The road milling structure (1) includes a milling drum (25), a drum baffle (26), a second belt (27), a motor box (28), a second motor (29), a belt baffle (30), and a sinking cylinder (31). The sinking cylinder (31) is fixedly mounted on a vehicle frame (34). The motor box (28) is fixedly connected to the sinking cylinder (31). The second motor (29) is mounted in the motor box (28). The drum baffle (26) is fixedly connected to the motor box (28) via a bracket. The milling drum (25) is engaged and rotatably arranged in the drum baffle (26). The two ends of the belt (27) are sleeved on the second motor (29) and the milling drum (25). The two ends of the belt baffle (30) are fixedly connected to the drum baffle (26) and the motor box (28), respectively.

4. The highway construction and maintenance equipment according to claim 3, characterized in that: The outside of the belt 1 (12) is also provided with a baffle 1 (38); the surface of the milling drum (25) is provided with a hook-shaped protrusion.

5. The highway construction and maintenance equipment according to claim 4, characterized in that: The gravel collecting device (2) comprises a gravel collecting shovel (32) and a collecting telescopic cylinder (33). The collecting telescopic cylinder (33) is fixedly mounted on a motor box (28). The gravel collecting shovel (32) is fixedly connected to the collecting telescopic cylinder (33). The bottom wall of the gravel collecting shovel (32) is configured as an inclined surface.

6. The highway construction and maintenance equipment according to claim 5, characterized in that: The frame (34) includes a roller (35), a side wall bracket (36), and a top plate (37). The roller (35) rolls along the ground. The side wall bracket (36) is engaged and rotatably connected to the roller (35). The top plate (37) is fixedly connected to the side wall bracket (36). A sinking cylinder (31) is provided on the bottom wall of the top plate (37).

7. The highway construction and maintenance equipment according to claim 6, characterized in that: A protrusion is provided on the outer wall of the belt baffle (30), and the protrusion is engaged with the side wall bracket (36).

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