Rotatable concealed pull-up ladder platform and pull-in storage method for combine harvester

Abstract

The application discloses a rotatable hidden pull-out ladder platform and a pull-out storage method for a combine harvester. The ladder platform comprises a top walkway assembly, a positioning slide rail assembly, a ladder and a hidden ladder slide cabin assembly. The top walkway assembly is connected with the positioning slide rail assembly, the upper walkway of the top walkway assembly and the inner side of the positioning slide rail assembly are fixedly connected with an extension frame of a vehicle body frame through screwing, the ladder is installed inside the hidden ladder slide cabin assembly and can slide in the ladder slide cabin to realize pulling out and hidden storage. The sliding shaft of the hidden ladder slide cabin assembly passes through the positioning slide rail assembly, passes through a locking mechanism to close a limiting groove at the front of the positioning slide rail assembly near the inner side of the vehicle body and is hung on a hanging hole of a bent plate outside the positioning slide rail assembly through a tail hook outside. An operator can easily pull out the ladder body from the ladder slide cabin and place the ladder body at a fixed position through rotation, pulling out and placing and the like, and the operator can enter the fixed walkway along the hidden ladder slide cabin, so that the operation is convenient and safe.

Description

Technical Field

[0001] This invention belongs to the field of harvester technology, specifically relating to a rotatable, concealable, pull-out ladder platform for combine harvesters and a pull-out storage method. Background Technology

[0002] A rotatable, retractable ladder platform for combine harvesters is a structural device designed to facilitate operator access to the rear equipment platform for routine maintenance and observation of the grain bins. For large combine harvesters, the entire equipment platform is high off the ground, with an attractive exterior design and large external protective components. Currently, most commercially available ladders for accessing the upper part of the vehicle are installed at the rear due to overall machine layout requirements. This direct access to the equipment platform via the ladder itself does not meet the functional and aesthetic needs of high-end, large combine harvesters, and also requires improvement in terms of safety and convenience for operators during access. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a rotatable, concealable, pull-out ladder platform for combine harvesters and a pull-out storage method. This method maximizes the use of the space between the rear of the combine harvester frame and the rear exterior trim, minimizing the space occupied by the vehicle while providing folding storage functionality.

[0004] This invention is achieved through the following technical solution:

[0005] This invention provides a rotatable, concealed, pull-out ladder platform for a combine harvester, including a top walkway assembly, a positioning slide rail assembly, a ladder, and a concealed ladder slide assembly;

[0006] The top walkway assembly is connected to the positioning slide rail assembly located horizontally below its upper walkway. The top walkway assembly, the positioning slide rail assembly, and the vehicle body frame extension frame are connected to form a C-shaped frame structure.

[0007] The concealed car ladder slide assembly is located below the positioning slide rail assembly and is moved by the positioning slide rail assembly. The concealed car ladder slide assembly is locked and opened by a locking mechanism. At the same time, the concealed car ladder slide assembly rotates around the rotating pull-out car ladder slide shaft located at its front as the central axis to realize opening and closing.

[0008] The car ladder is installed inside the concealed car ladder slide assembly, and can slide freely within the concealed car ladder slide assembly to achieve extraction and storage.

[0009] Furthermore, the top walkway assembly includes an upper walkway, a walkway reinforcing beam, and a vertical vehicle ladder limiting plate;

[0010] The lower part of the upper walkway is welded and fixed to several walkway reinforcing beams arranged horizontally and vertically, and the vertical vehicle ladder limiting plate is welded and fixed to the rear part of the upper walkway.

[0011] Furthermore, the positioning slide rail assembly includes a support plate and a slide rail;

[0012] The support plate has an L-shaped structure, and its upper guide plane is welded and fixed to a slide rail with a rectangular cross section. The inner and outer sides of the guide plane of the support plate are respectively provided with a closed limiting groove and an open positioning groove. The outer side of the support plate with an upward bending plate is provided with a hooking hole for attaching the tail hook of the concealed car ladder slide assembly. The top walkway assembly is screwed and fixed to the bending plate.

[0013] Furthermore, the elevator includes an elevator body, elevator handles, and elevator limit plates;

[0014] The main body of the ladder is a welded frame structure, with a ladder limiting plate welded to the front and a ladder handle welded to the rear. When the ladder is stored inside the concealed ladder slide assembly, the ladder handle protrudes from the rear of the concealed ladder slide assembly.

[0015] Furthermore, the concealed vehicle ladder slide assembly includes a vehicle ladder slide welded assembly, and the locking mechanism includes a locking handle, a pin, a spring, a locking slide rod, a baffle, and a cotter pin;

[0016] The upper and lower ends of the inner side plate of the car ladder slide assembly are respectively welded with a hanging rod shaft assembly and a positioning seat. The concealed car ladder slide assembly is loosely fitted onto the positioning slide rail assembly through the hanging rod shaft assembly; and the positioning holes on the upper and lower end faces of the positioning seat coincide with the center of the through hole on the bent bracket of the hanging rod shaft assembly.

[0017] The locking slide rod has an L-shaped structure. Its long axis passes through the upper positioning hole of the positioning seat and the hanging rod shaft welded assembly, and passes through the closed limiting groove on the inner side of the positioning slide rail assembly. The short rod tail of the locking slide rod is hooked to the front of the locking handle located below the tail of the car ladder slide assembly, and the two form a linkage structure. Through the cotter pin passing through the locking slide rod, the spring and the baffle are loosely fitted on the locking slide rod, and the baffle is placed on the spring.

[0018] A U-shaped slot is welded and fixed below the tail of the car ladder slide assembly. The locking handle is connected to the U-shaped slot by a pin and rotates around the pin to lock and open the concealed car ladder slide assembly.

[0019] Furthermore, the welded assembly of the car ladder slide includes a rotating shaft for the rotating and pulling car ladder slide, a support plate, a side panel, an inner side panel, a bottom reinforcing plate, and a walkway plane;

[0020] The vertically arranged rotating pull-out ladder slide has its rotating shaft welded and fixed to the support plate and side panel, and the three form a triangular structure. The inner side plate and side panel are distributed on the inner and outer sides of the ladder slide welded parts, and a tail hook is welded and fixed at the tail of the side panel.

[0021] Furthermore, the lower part of the walkway is horizontally distributed with reinforcing beams, which are connected to the rear end of the tail guard plate, and the exit width of the tail guard plate is smaller than the width of the top of the ladder.

[0022] Furthermore, auxiliary guide plates and side guide plates are obliquely fixed inside the elevator slide welded assembly to limit and guide the elevator when it slides within the elevator slide welded assembly.

[0023] Furthermore, bushings, bushings, and bolts are respectively installed at the upper and lower ends of the rotating shaft of the rotating pull-out ladder slide to ensure that the bushings can rotate in the bushings. The rotating shaft of the rotating pull-out ladder slide with bushings and bushings is installed between the upper and lower supports of the engine bracket and is fixed to the support surfaces of the upper and lower supports of the engine bracket by bolts.

[0024] This invention also provides a method for storing a rotatable, concealable pull-out ladder platform for a combine harvester, comprising the following steps:

[0025] Step 1: The operator first lifts the locking handle upwards. At this time, the locking handle and the locking slide rod form a linkage structure. With the pin on the U-shaped slot as the axis, the locking slide rod will move downwards until its long axis disengages from the closed limiting groove inside the positioning slide rail assembly.

[0026] Step 2: The operator then pulls the locking handle outward, and the tail hook separates from the hook hole on the positioning slide rail assembly. The concealed car ladder slide assembly drives the car ladder and the exterior trim assembly to rotate around the rotating shaft of the car ladder slide assembly. All three slide out from under the upper platform through the hanging shaft of the hanging rod shaft assembly and the positioning slide rail assembly as the sliding track.

[0027] When the long axis of the locking slide rod slides and falls into the opening positioning groove on the positioning slide rail assembly, the whole rotation reaches the maximum unfolding angle and locks, thus completing the rotation of the rotatable hidden pull-out car ladder platform.

[0028] Step 3: Once the rotatable, concealed, pull-out ladder platform has reached its maximum unfolding angle, the operator can use the ladder handle to pull the main body of the ladder out of the ladder slide welded assembly.

[0029] As the ladder is about to be fully pulled out, the tail guard plate at the rear of the ladder slide welded assembly forms a limiting and fixing plate for the ladder until it falls naturally and forms a comfortable angle off the ground, making it easy for the operator to board and use the ladder, thus completing the pulling out of the rotatable and retractable ladder platform.

[0030] Step 4: After the operator has finished using the ladder, continue to use the ladder handle to push the main body of the ladder into the ladder slide assembly until the tail guard plate locks the ladder again. At this point, the ladder body is fixed. Then, continue to pull the locking handle inward to rotate the rotatable hidden pull-out ladder platform inward until the long axis of the locking slide rod slides and falls into the closed limit groove on the positioning slide rail assembly. The entire rotation reaches the initial angle and locks in place, thus completing the storage of the rotatable hidden pull-out ladder platform.

[0031] The beneficial effects of this invention are as follows:

[0032] (1) The present invention adopts a rotatable concealed car ladder compartment structure, and the car ladder body can be stored inside the car ladder compartment;

[0033] (2) When in the closed state, the car ladder slide and the car ladder slide together into the closed frame structure composed of the top walkway assembly and the positioning slide rail assembly, and are covered by the outer trim assembly to ensure that the overall appearance of the machine is coordinated and beautiful.

[0034] (3) When the operator enters the vehicle body, he only needs to lift and pull the locking handle outward. The locking slide rod moves down and disengages from the closed limit groove. The tail hook separates from the hook hole. Under the guidance of the positioning slide rail assembly, the locking slide rod slides outward to the opening positioning groove, and the exterior trim assembly can be easily opened and the ladder can be taken out. The ladder slide and the ladder together with the exterior trim assembly are opened at a certain angle. At this time, the hidden ladder slide slide completely slides out from the bottom of the top platform. Hold the ladder handle and pull out the ladder body. The ladder limit plate presses against the tail guard plate of the ladder slide and lowers it to hang down naturally. At this time, the ladder body forms a certain angle with the ground, which makes it convenient for the operator to enter and exit the ladder body freely and safely.

[0035] In summary, this device allows operators to access the rear equipment platform for routine maintenance and to observe the grain bins. The combine harvester needs to have a ladder installed at the rear of the vehicle to meet the operator's walking space requirements and minimize the ladder storage space during daily operation, while also ensuring the integrity and aesthetics of the overall machine appearance. Attached Figure Description

[0036] Figure 1 This is an installation diagram of a rotatable, concealed, pull-out ladder platform for a combine harvester;

[0037] Figure 2 A schematic diagram of the installation structure of the concealed ladder slide assembly and positioning slide rail assembly in a rotatable concealed pull-out ladder platform for a combine harvester;

[0038] Figure 3 This is a structural schematic diagram of a concealed ladder slide assembly in a rotatable, concealed, pull-out ladder platform for a combine harvester.

[0039] Figure 4 A schematic diagram showing the opening of a concealed ladder slide assembly in a rotatable, concealed, pull-out ladder platform for a combine harvester;

[0040] Figure 5 a, 5b, 5c, and 5d are schematic diagrams illustrating the process of a rotatable, retractable, and pull-out ladder platform for a combine harvester, including its overall storage, rotation, extraction, and lowering.

[0041] Reference numerals: 1. Top walkway assembly; 1.1 Upper walkway; 1.2 Walkway reinforcing beam; 1.3 Vertical ladder limiting plate; 2. Positioning slide rail assembly; 2.1 Support plate; 2.2 Slide rail; 2.3 Closed limiting groove; 2.4 Opening positioning groove; 2.5 Bending plate; 3. Ladder; 3.1 Ladder body; 3.2 Ladder handle; 3.3 Ladder limiting plate; 4. Concealed ladder slide assembly; 4.1 Ladder slide welded assembly; 4.1.1 Rotating pull-out ladder slide rotation shaft; 4.1.2 Support pull plate; 4.1.3 Side panel; 4.1.4 Inner side panel; 4 4.1.5 Reinforcing beam; 4.1.6 Rear guard plate; 4.1.7 Side guide plate; 4.1.8 Auxiliary guide plate; 4.1.9 Welded assembly of hanging rod shaft; 4.1.10 Bottom reinforcing plate; 4.1.11 Rear hook; 4.1.12 Positioning seat; 4.1.13 Walkway plane; 4.1.14 U-shaped slot; 4.2 Locking handle; 4.3 Pin; 4.4 Spring; 4.5 Locking slide bar; 4.6 Baffle; 4.7 Cotter pin; 5 Bushing; 6 Bushing; 7 Bolt; 8 Engine mount; 9 Body frame extension frame; 10 Exterior trim assembly. Detailed Implementation

[0042] A rotatable, concealed, pull-out ladder platform for a combine harvester mainly comprises: a top walkway assembly 1, a positioning slide rail assembly 2, a ladder 3, and a concealed ladder slide assembly 4. The top walkway assembly 1 and the positioning slide rail assembly 2 are screwed together with their outer bent plates. The upper platform of the top walkway assembly 1 has evenly distributed holes on its inner side, which are screwed together with the lower inner support of the positioning slide rail assembly 2 to the vehicle frame extension frame 9. Together with the vehicle frame extension frame 9, they form a "C"-shaped closed frame structure.

[0043] The concealed car ladder slide assembly 4 is loosely fitted onto the positioning slide rail assembly 2 via the hanging rod shaft welded assembly 4.1.9. Near the inner side of the vehicle body, a locking slide rod 4.5 passes through the "closing limit groove" on the inner side of the positioning slide rail assembly 2. On the outer side, it is hooked to the upper outer hook hole of the support plate 2.1 via the tail hook 4.11, locking the concealed car ladder slide assembly 4 into a closed state. The car ladder 3 is installed inside the car ladder slide welded assembly 4.1 and can slide freely within it, allowing for extraction and storage.

[0044] Install bushing 5 inside bushing 6, and then assemble and insert it into the upper and lower ends of the rotating pull-out ladder slide shaft 4.1.1 at the front of the concealed ladder slide assembly 4, ensuring that bushing 5 can rotate within bushing 6. Next, install the rotating pull-out ladder slide shaft 4.1.1 with bushing 6 and bushing 5 installed between the upper and lower supports of the engine bracket 8, and secure it to the support surfaces of the upper and lower supports of the engine bracket 8 using bolts 7. The concealed ladder slide assembly 4 rotates around the rotating pull-out ladder slide shaft 4.1.1 as its central axis, enabling opening and closing.

[0045] The engine mount 8 and the body frame extension frame 9 are components of other parts of the harvester, and are only used to provide reliable fixation for the rotatable, retractable ladder platform. They are not part of the rotatable, retractable ladder platform.

[0046] The top walkway assembly 1 mainly includes: an upper walkway 1.1, a walkway reinforcing beam 1.2, and a vertical vehicle ladder limiting plate 1.3. The lower part of the upper walkway 1.1 is welded and fixed to several walkway reinforcing beams 1.2 arranged horizontally and vertically, and the vertical vehicle ladder limiting plate 1.3 is welded and fixed to the rear part of the upper walkway 1.1.

[0047] The positioning slide rail assembly 2 mainly includes: a support plate 2.1 and a slide rail 2.2. The support plate 2.1 has an "L"-shaped structure formed by bending, and its upper guide plane is welded and fixed to the rectangular section slide rail 2.2. The inner and outer sides of the guide plane of the support plate 2.1 are respectively provided with a closed limiting groove 2.3 and an open positioning groove 2.4. The support plate 2.1 has a hook hole for the tail hook 4.1.11 of the hidden car ladder slide assembly 4 on the outer upward bending plate.

[0048] The ladder 3 mainly includes: a ladder body 3.1, a ladder handle 3.2, and a ladder limiting plate 3.3. The ladder body 3.1 is a welded frame structure, with the ladder limiting plate 3.3 welded to the front, forming a certain angle with it. The ladder handle 3.2 is welded to the rear of the ladder body 3.1. When the ladder 3 is housed inside the ladder slide welded assembly 4.1, the ladder handle 3.2 protrudes from the rear of the ladder slide welded assembly 4.1.

[0049] The concealed car ladder slide assembly 4 mainly includes: car ladder slide welded assembly 4.1, locking handle 4.2, pin 4.3, spring 4.4, locking slide rod 4.5, baffle plate 4.6, and cotter pin 4.7.

[0050] The main components of the car ladder slide assembly 4.1 include: rotating shaft of the rotating slide 4.1.1, support plate 4.1.2, side panel 4.1.3, inner side panel 4.1.4, reinforcing beam 4.1.5, tail guard plate 4.1.6, side guide plate 4.1.7, auxiliary guide plate 4.1.8, hanging rod shaft assembly 4.1.9, bottom reinforcing plate 4.1.10, tail hook 4.1.11, positioning seat 4.1.12, walkway plane 4.1.13, and U-shaped slot 4.1.14.

[0051] The rotating shaft 4.1.1, support plate 4.1.2, and side panel 4.1.3 of the rotating pull-out ladder compartment are welded and fixed, forming a stable "triangular" structure. The inner side panel 4.1.4 and side panel 4.1.3 are distributed on the inner and outer sides, respectively. The platform plane 4.1.13 has horizontally distributed reinforcing beams 4.1.5 at the bottom, and the rear end connects to the tail guard plate 4.1.6. All these components are welded to form the frame-like main structure of the concealed ladder compartment assembly 4. The auxiliary guide plate 4.1.8 and side guide plate 4.1.7 are obliquely fixed inside the frame-like main structure of the concealed ladder compartment assembly 4, used to limit and guide the ladder 3 when it slides through the ladder compartment welded assembly 4.1. The tail hook 4.1.11 is welded and fixed to the tail of the side panel 4.1.3. The U-shaped slot 4.1.14 is welded and fixed below the tail of the ladder compartment welded assembly 4.1. The upper and lower ends of the inner side plate 4.1.4 are respectively welded with the hanging rod shaft welded part 4.1.9 and the positioning seat 4.12, and the positioning holes on the upper and lower end faces of the positioning seat 4.12 are aligned with the center of the through hole on the bending bracket of the hanging rod shaft welded part 4.1.9.

[0052] The spring 4.4 and the stop plate 4.6 are loosely fitted onto the locking slide rod 4.5 via the cotter pin 4.7, with the stop plate 4.6 positioned above the spring 4.4. The locking slide rod 4.5 has an "L"-shaped structure, with its long shaft passing through the positioning seat 4.1.12 and the upper positioning hole of the hanging rod shaft welded assembly 4.1.9. The short rod end of the locking slide rod 4.5 is hooked to the front of the locking handle 4.2, forming a linkage structure. The locking handle 4.2 is connected to the U-shaped slot 4.1.14 via a pin 4.3, rotating around the pin 4.3 to lock and open the concealed car ladder slide assembly 4.

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0054] Example:

[0055] As attached Figure 1 The diagram shows the installation of a rotatable, retractable ladder platform for a combine harvester, which is in a retracted and closed state.

[0056] The top walkway assembly 1 and the outer bending plate 2.5 of the positioning slide rail assembly 2 are screwed together and fixed. The upper walkway of the top walkway assembly 1 and the inner side of the positioning slide rail assembly 2 are screwed together and fixed to the body frame extension frame 9 respectively. The two and the body frame extension frame 9 form a closed frame structure.

[0057] The ladder 3 is installed inside the concealed ladder slide assembly 4, within the ladder slide welded assembly 4.1. It can slide freely within the ladder slide welded assembly 4.1, achieving concealment and storage, and both can rotate and be fixed simultaneously. The bushing 5 is installed in the bushing 6 and is inserted into the upper and lower end faces of the rotating pull-out ladder slide rotating shaft 4.1.1 at the front end of the concealed ladder slide assembly 4, ensuring that the bushing 5 can rotate within the bushing 6. After installation, the rotating pull-out ladder slide rotating shaft 4.1.1 is inserted between the two ends of the upper and lower supports of the rear bracket engine bracket 8, and the top and bottom are fixed with bolts 7 respectively.

[0058] The system allows the ladder 3, exterior trim assembly 10, and concealed ladder slide assembly 4 to rotate around the rotating shaft 4.1.1 of the sliding ladder slide, enabling them to open and close. The support plate 4.1.2 of the concealed ladder slide assembly 4 is screwed and fixed to the exterior trim assembly 10, ensuring that the concealed ladder slide assembly 4 is completely covered by the exterior trim assembly 10 when closed, thus maintaining a consistent overall appearance and eliminating any exposed ladder components.

[0059] In the closed state, the hanging rod shaft assembly 4.1.9, which is fixed to the inner plate 4.1.4 of the rotating pull-out staircase liner assembly 4.1, is loosely fitted onto the upper part of the positioning slide rail assembly 2. The hanging rod shaft assembly 4.1.9, together with the top walkway assembly and the positioning slide rail assembly 2, forms a "hook-in" connection in the closed frame structure. Through the guiding action of the positioning slide rail assembly 2, the concealed staircase liner assembly 4 slides out. At this time, the "L"-shaped long shaft of the locking slide rod 4.5 passes from bottom to top through the spring 4.4 between the upper and lower end faces of the positioning seat 4.1.12 and the positioning hole of the hanging rod shaft assembly 4.1.9, and finally extends out of the closed limiting groove inside the positioning slide rail assembly 2 and locks in place. At the same time, the tail hook 4.1.11 of the rotating pull-out staircase liner assembly 4.1 engages with the hook hole of the bent plate on the outer side of the positioning slide rail assembly 2, together achieving the locking of the rotating pull-out staircase liner assembly 4 in the closed state.

[0060] As attached Figure 2 The diagram shows the installation structure of the hidden ladder slide assembly and positioning slide rail assembly in a rotatable, concealed, pull-out ladder platform for a combine harvester. The entire structure is in a rotating and open state.

[0061] Lift it upwards using the locking handle 4.2. At this time, the linkage structure formed by the locking handle 4.2 and the locking slide rod 4.5, with the pin 4.3 on the U-shaped slot 4.1.14 as the pivot point, causes the locking slide rod 4.5 to move downwards. The long axis of the locking slide rod 4.5 disengages from the "closed limiting groove" inside the positioning slide rail assembly 2.

[0062] Next, pull the locking handle 4.2 outwards, and the tail hook 4.1.11 separates from the hook hole on the connecting plate of the outer part of the positioning slide rail assembly 2. At this time, the hidden car ladder compartment 4 drives the car ladder 3 and the exterior trim assembly 10, and the three of them slide out from the lower part of the upper platform 1.1 through the hanging shaft of the hanging rod shaft welding assembly 4.1.9, using the positioning slide rail assembly 2 as the sliding track. Rotate and pull out the car ladder compartment assembly 4 with the rotating shaft 4.1.1 of the rotating and pulling car ladder compartment as the central axis, and rotate and open to a certain angle. When the locking slide rod 4.5 slides into the "opening positioning groove" on the positioning slide rail assembly 2, the maximum unfolding angle is reached and locked.

[0063] As attached Figure 3 and attached Figure 4 As shown, after the rotating and pulling car ladder compartment assembly 4 reaches its maximum unfolding angle, the car ladder body 3.1 can be pulled out from the car ladder compartment welded assembly 4.1 using the car ladder handle 3.2. The auxiliary guide plate 4.1.8 and side guide plate 4.1.7 inside the concealed car ladder compartment 4 are two vertical plates parallel to the direction of extraction of the car ladder body 3.1, ensuring that the car ladder body 3.1 can be pulled out smoothly and easily. A car ladder limiting plate 3.3 is welded to the top right side of the car ladder body 3.1, forming a certain angle with it. When the car ladder 3 is fully pulled out, it forms a limiting and fixing effect with the tail guard plate 4.1.6 at the rear of the car ladder compartment welded assembly 4. This allows the car ladder body 3 to fall naturally and form a comfortable ground clearance angle, facilitating the operator's entry into the vehicle.

[0064] As attached Figure 5 As shown, this illustrates the process of a combine harvester's rotatable, concealed, pull-out platform going from its stowed state to its fully unfolded state. The reverse of this process is the process of the combine harvester's rotatable, concealed, pull-out platform going from its fully unfolded state to its stowed state.

[0065] Working principle

[0066] A rotatable, concealed, pull-out ladder platform for a combine harvester (hereinafter referred to as the "platform") has two locking states, defined here as initial closure and final opening, respectively. The locking and releasing mechanisms are identical. When the "platform" is in the initial locking state, the exterior trim assembly 10 and the concealed ladder slide assembly 4 are closed. At this time, the locking handle 4.2, by its own weight and the elastic force of the spring 4.4, firmly secures the locking slide rod 4.5 within the "closing limit groove" on the support plate 2.1 of the positioning slide rail assembly 2.

[0067] The tail hook 4.1.13 of the car ladder slide assembly 4.1 engages with the hook hole on the upper connecting plate of the outer part of the positioning slide rail assembly 2. At this time, the concealed car ladder slide assembly 4, together with the car ladder 3 placed inside it, is hidden under the fixed upper platform 1.1, and its rotation is restricted. When the car ladder 3 needs to be used, one end of the locking handle 4.2 is lifted upwards. At this time, the linkage structure formed by the locking handle 4.2 and the locking slide rod 4.5, with the pin 4.3 as the pivot point, moves the locking slide rod 4.5 downwards. The long axis of the locking slide rod 4.5 disengages from the "closed limiting groove" inside the positioning slide rail assembly 2. Then, pulling the locking handle 4.2 outwards causes the concealed car ladder slide assembly 4 to drive the car ladder 3 and the exterior trim assembly 10 to rotate around the rotating shaft 4.1.1 of the car ladder slide, opening outwards.

[0068] At this point, the tail hook 4.11 will separate from the hook hole of the connecting plate on the outer side of the positioning slide rail assembly 2. The hanging shaft of the hanging rod shaft welded assembly 4.1.9 will remain in close contact with the upper surface of the slide rail 2.2 due to the weight of the car ladder slide assembly 4.1 and rotate along the slide rail 2.2. When the long shaft of the locking rod 4.5 slides out to the edge of the "opening positioning groove" on the inner side of the positioning slide rail assembly 2, it will continue to move until the elastic force of the spring 4.4 and the limiting support of the baffle 4.6 will lock the locking rod 4.5 into the "opening positioning groove" on the support plate 2.1. At this point, the "platform" is in the terminated opening state. The exterior trim assembly 10, together with the hidden car ladder slide assembly 4, reaches the maximum unfolding angle and locks.

[0069] Next, the operator must hold the ladder handle 3.2 and pull the ladder 3 out from the ladder slide welded assembly 4.1. As the ladder 3 slides, the auxiliary guide plate 4.6 and the side guide plate 4.7 will continuously guide and limit the ladder 3, ensuring a smooth and unobstructed extraction process. When the ladder 3 is completely pulled out, because the exit width of the tail guard plate 4.1.6 of the ladder slide welded assembly 4.1 is smaller than the width of the top of the ladder, the ladder limiting plate 3.3 will lock at the exit of the ladder slide welded assembly 4.1, ensuring that the ladder 3 will not be completely pulled out and fall, thus preventing personal injury.

[0070] At this point, the other end of the ladder 3 will automatically fall to the ground due to gravity. During this time, the operator must always hold the ladder handle 3.2 to lower the ladder 3 to its lowest position. The last step of the ladder 3 is at the most comfortable height for human use and meets national standards. At this point, the "platform" is fully extended, and the operator can use the ladder 3 to easily access the rear equipment platform for routine maintenance and observation of grain bins via the platform plane 4.1.13 and the upper platform 1.1. At the same time, the top platform welded assembly 1 and the hidden ladder slide assembly 4 can also be used as walkways for the operator to access the entire equipment platform for routine maintenance.

[0071] In summary, this invention enables the deployment and concealment of the hidden ladder at the rear of the combine harvester through rotation, pull-out, and placement operations, meeting the needs of operators for accessing grain storage or routine maintenance. This rotating, concealed, pull-out ladder structure is fixedly connected to the exterior trim. When the right rear exterior panel is opened, the hidden ladder slide opens from under the fixed platform. Operators can easily pull the ladder body out from the hidden ladder slide and place it in a fixed position, smoothly boarding the machine. They can then ascend the fixed platform via the hidden ladder slide to access the machine's equipment platform for routine maintenance. The overall operation is convenient and safe. Furthermore, the overall structure is simple and easy to operate, allowing for reliable storage on both the platform and the ground, avoiding excessive width and meeting the safety requirements for combine harvester operation on roads.

[0072] It should be noted that although the present invention has been described through the above embodiments, the present invention may have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A rotatable concealed draw ladder platform for a combine harvester, characterized by: Includes top walkway assembly (1), positioning slide rail assembly (2), car ladder (3), and concealed car ladder slide assembly (4); The top walkway assembly (1) is connected to the positioning slide rail assembly (2) located horizontally below its upper walkway. The top walkway assembly (1) and the positioning slide rail assembly (2) are connected to the vehicle frame extension frame (9) and form a C-shaped frame structure. The concealed car ladder slide assembly (4) is located below the positioning slide rail assembly (2) and is moved by the positioning slide rail assembly (2). The concealed car ladder slide assembly (4) is locked and opened by a locking mechanism. At the same time, the concealed car ladder slide assembly (4) rotates and pulls the car ladder slide rotation shaft located at its front. 4.1.1) The device rotates around a central axis to achieve opening and closing. The ladder (3) is installed inside the concealed ladder slide assembly (4) and can slide freely inside the concealed ladder slide assembly (4) to achieve extraction and storage; the concealed ladder slide assembly (4) includes a ladder slide welded assembly (4.1), and the locking mechanism includes a locking handle (4.2), a pin (4.3), a spring (4.4), a locking slide rod (4.5), a baffle (4.6), and a cotter pin (4.7); the upper and lower ends of the inner side plate (4.1.4) of the ladder slide welded assembly (4.1) are respectively welded with a hanging rod shaft welded assembly (4.1.9) and a positioning seat (4.12), and the concealed ladder slide assembly (4) is loosely fitted onto the positioning slide rail assembly (2) through the hanging rod shaft welded assembly (4.1.9); and the positioning holes on the upper and lower end faces of the positioning seat (4.12) are connected to the hanging rod shaft welded assembly (4.1.9). The centers of the through holes on the bending bracket (4.1.9) coincide; The locking slide rod (4.5) has an L-shaped structure. Its long axis passes through the upper positioning hole of the positioning seat (4.1.12) and the hanging rod shaft welded assembly (4.1.9), and passes through the closed limiting groove (2.3) inside the positioning slide rail assembly (2). The short rod tail of the locking slide rod (4.5) is hooked to the front of the locking handle (4.2) located below the tail of the car ladder slide assembly (4.1), and the two form a linkage structure; through the cotter pin (4.5) passing through the locking slide rod (4.5). 7) The spring (4.4) and the baffle (4.6) are loosely fitted on the locking slide rod (4.5), and the baffle (4.6) is placed on the spring (4.4); a U-shaped slot (4.1.14) is welded and fixed below the tail of the car ladder slide assembly (4.1), and the locking handle (4.2) is connected to the U-shaped slot (4.1.14) through the pin (4.3). The pin (4.3) is used as the pivot to rotate, thereby realizing the locking and opening of the hidden car ladder slide assembly (4).

2. A rotatable concealed draw ladder platform for a combine harvester as claimed in claim 1, wherein: The top walkway assembly (1) includes an upper walkway (1.1), a walkway reinforcing beam (1.2), and a vertical vehicle ladder limiting plate (1.3). The lower part of the upper walkway (1.1) is welded and fixed to several walkway reinforcing beams (1.2) arranged in a horizontal and vertical pattern, and the vertical vehicle ladder limiting plate (1.3) is welded and fixed to the rear part of the upper walkway (1.1).

3. A rotatable concealed draw ladder platform for a combine harvester as claimed in claim 1, wherein: The positioning slide rail assembly (2) includes a support plate (2.1) and a slide rail (2.2). The support plate (2.1) has an L-shaped structure, and its upper guide plane is welded and fixed to the slide rail (2.2) with a rectangular cross section. The inner and outer sides of the guide plane of the support plate (2.1) are respectively provided with a closed limiting groove (2.3) and an open positioning groove (2.4). The bent plate (2.5) on the outer side of the support plate (2.1) is provided with a hook hole for attaching the tail hook (4.1.11) of the concealed car ladder slide assembly (4). The top walkway assembly (1) is screwed and fixed to the bent plate (2.5).

4. A rotatable concealed draw ladder platform for a combine harvester as claimed in claim 1, wherein: The ladder (3) includes a ladder body (3.1), a ladder handle (3.2), and a ladder limiting plate (3.3). The main body of the ladder (3.1) is a welded frame structure. A ladder limiting plate (3.3) is welded to the front of the ladder, and a ladder handle (3.2) is welded to the rear of the main body of the ladder (3.1). When the ladder (3) is stored inside the concealed ladder slide assembly (4), the ladder handle (3.2) is exposed at the rear of the concealed ladder slide assembly (4).

5. A rotatable concealed draw ladder platform for a combine harvester as claimed in claim 1, wherein: The boarding ladder slide welded assembly (4.1) includes a rotating shaft (4.1.1) for the rotating and pulling boarding ladder slide, a support plate (4.1.2), a side panel (4.1.3), an inner side panel (4.1.4), a bottom reinforcing plate (4.1.10), and a walkway plane (4.1.13). The vertically arranged rotating pull-out car ladder slide's rotating shaft (4.1.1) is welded and fixed to the support plate (4.1.2) and the side panel (4.1.3), and the three form a triangular structure. The inner side plate (4.1.4) and the side panel (4.1.3) are distributed on the inner and outer sides of the car ladder slide welded assembly (4.1). A tail hook (4.1.11) is welded and fixed to the tail of the side panel (4.1.3).

6. A rotatable, concealed, pull-out ladder platform for a combine harvester according to claim 5, characterized in that: The lower part of the walkway plane (4.1.13) is evenly distributed with reinforcing beams (4.1.5), which are connected to the rear guard plate (4.1.6). The exit width of the rear guard plate (4.1.6) is smaller than the width of the top of the ladder.

7. A rotatable, concealed, pull-out ladder platform for a combine harvester according to claim 5, characterized in that: Inside the ladder slide welded assembly (4.1), there are also obliquely fixed auxiliary guide plates (4.1.8) and side guide plates (4.1.7) for limiting and guiding the ladder (3) when it slides in the ladder slide welded assembly (4.1).

8. A rotatable concealed draw ladder platform for a combine harvester as claimed in claim 1, wherein: A bushing (5), a bushing (6), and a bolt (7) are respectively installed at the upper and lower ends of the rotating shaft (4.1.1) of the rotating slide ladder liner to ensure that the bushing (5) can rotate in the bushing (6). The rotating shaft (4.1.1) of the rotating slide ladder liner with bushing (6) and bushing (5) is installed between the upper support and the lower support of the engine bracket (8) and is fixed to the upper support and the lower support surface of the engine bracket (8) by bolts (7).

9. The method of claim 1-8, wherein the method further comprises: rotating the platform to a hidden position. Includes the following steps: Step 1: The operator first lifts the locking handle (4.2) upwards. At this time, the locking handle (4.2) and the locking slide bar (4.5) form a linkage structure. With the pin (4.3) on the U-shaped slot (4.1.14) as the axis, the locking slide bar (4.5) will move downwards until its long axis disengages from the closed limiting groove (2.3) inside the positioning slide rail assembly (2). Step 2: The operator then pulls the locking handle (4.2) outward, and the tail hook (4.1.11) separates from the hook hole on the positioning slide rail assembly (2). The hidden car ladder slide assembly (4) drives the car ladder (3) and the exterior assembly (10) to slide out from under the upper platform (1.1) with the rotating pull-out car ladder slide rotation shaft (4.1.1) as the center axis. The three of them slide out from under the upper platform (1.1) through the hanging shaft of the hanging rod shaft welding assembly (4.1.9) with the positioning slide rail assembly (2) as the sliding track. When the long axis of the locking slide bar (4.5) slides and falls into the opening positioning groove (2.4) on the positioning slide rail assembly (2), the whole rotation reaches the maximum unfolding angle and locks, thereby completing the rotation of the rotatable hidden pull-out car ladder platform; Step 3: After the rotatable and retractable pull-out ladder platform has reached its maximum unfolding angle, the operator can use the ladder handle (3.2) to pull the ladder body (3.1) out of the ladder slide welded assembly (4.1); When the ladder (3) is about to be fully pulled out, the tail guard plate (4.1.6) at the rear of the ladder slide welded part (4.1) forms a limit and fixation on the ladder (3) until the ladder (3) falls naturally and forms a comfortable angle off the ground, making it convenient for the operator to board the vehicle and use it, thus completing the pulling out of the rotatable hidden pull-out ladder platform. Step 4: After the operator has finished using the ladder, continue to use the ladder handle (3.2) to push the ladder body (3.1) into the ladder slide welded assembly (4.1) until the tail guard plate (4.1.6) locks the ladder (3) again. At this time, the vehicle body is fixed. Then continue to pull the locking handle inwards. 4.2) Drive the rotatable hidden pull-out car ladder platform to rotate into the car until the long axis of the locking slide rod (4.5) slides and falls into the closed limiting groove (2.3) on the positioning slide rail assembly. The whole rotation reaches the initial angle and locks, thus completing the storage of the rotatable hidden pull-out car ladder platform.

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