Buffer type overhead guard with adjustable length and width

Abstract

The invention discloses a length and width adjustable buffer type overhead guard, and relates to the technical field of forklift overhead guards, the length and width adjustable buffer type overhead guard comprises a plurality of front leg assemblies, rear beam assemblies are arranged among the top ends of the front leg assemblies, a plurality of rib plates are arranged among the rear beam assemblies, and rear legs are arranged below one ends of the front leg assemblies; the front leg assembly comprises a plurality of side beams connected through adjustable parts, the rear beam assembly comprises a plurality of rear beams connected through adjustable parts, and the two ends of the rib plate are fixed to the rear beam assembly through horizontally-arranged buffering parts. By arranging the adjustable part, the length and the width of the overhead guard can be adjusted, so that the overhead guard is suitable for overhead guards of different vehicle types, and the applicability is improved. And by arranging the horizontally arranged buffer device, the downward kinetic energy of the falling weight is converted into elastic potential energy, so that the deformation resistance of the overhead guard is improved, and the service life of the rib plate is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of forklift overhead protection, in particular to a buffer-type overhead protection frame with adjustable length and width. Background Art

[0002] For traditional overhead guardrails, different models require different overhead guardrails to be welded, which increases the cost. At the same time, when developing a new model, a new overhead guardrail that matches it needs to be developed. The new overhead guardrail requires technicians and workshop workers to spend a lot of time to complete. More importantly, the deformation of the ribs caused by the impact of heavy blocks above the driver's head is permanent. As the number of heavy blocks hitting the driver's head increases, the permanent deformation of the ribs is gradually accumulated, which undoubtedly increases the risk of the driver's operation. When the permanent deformation of the ribs reaches a level that makes them unusable, another set of overhead guardrails needs to be replaced. The process is cumbersome and increases costs.

[0003] Chinese Patent Publication Number: CN118723869A, Publication Date: October 1, 2024, discloses a high-strength forklift overhead guard assembly with a rebound buffer structure. The patent relates to the field of forklift overhead guard technology and specifically includes a load-bearing frame with a first bracket mounted on either side of one end and a second bracket mounted on either side of the other end. The top of the load-bearing frame is provided with an elastic protective mechanism comprising two parallel curved support beams connected by a protective net. The curved support beams have downward openings, and the curved support beams and the protective net form a protective cover that covers the load-bearing frame. This overhead guard is not adjustable in length or width, resulting in poor applicability. Summary of the Invention

[0004] The present invention provides a buffer-type overhead guard with adjustable length and width. Adjustable parts are provided to achieve adjustment of the length and width of the overhead guard, thereby being applicable to overhead guards of different vehicle models and improving applicability.

[0005] A further object of the present invention is to convert the downward kinetic energy of the falling weight into elastic potential energy by providing a horizontally arranged buffer device, thereby increasing the deformation resistance of the overhead guard and extending the service life of the ribs.

[0006] To achieve the above objectives, the present invention employs the following technical solution: a buffer-type overhead guard with adjustable length and width, comprising several front leg assemblies, a rear beam assembly disposed between the top ends of the front leg assemblies, several ribs disposed between the rear beam assemblies, and a rear leg disposed below one end of the front leg assemblies. The front leg assembly comprises several side beams connected by adjustable members, and the rear beam assembly comprises several rear beams connected by adjustable members. The ends of the ribs are secured to the rear beam assembly via horizontally arranged buffer members. The front leg assembly and the rear beam assembly are welded together, and the rear leg is welded to the front leg assembly, together forming the overhead guard.

[0007] Preferably, the adjustable member includes a first adjustment plate and a second adjustment plate, the first adjustment plate and the second adjustment plate being arranged opposite each other, with the first adjustment plate disposed within the second adjustment plate. The outer wall of the first adjustment plate and the inner wall of the second adjustment plate are in contact. This structural design allows the length and width of the overhead guard to be flexibly adjusted to suit different vehicle models, greatly improving the versatility and applicability of the overhead guard, meeting the installation requirements of a wide range of vehicle models and reducing installation difficulties and increased costs caused by vehicle model differences.

[0008] Preferably, the first and second adjustment plates are U-shaped plates with identical structures. The first adjustment plate is smaller than the second adjustment plate, and each plate has a plurality of first adjustment holes on its sidewalls. Bolts pass through the first adjustment holes of the first and second adjustment plates, respectively, securing the first and second adjustment plates. The U-shaped plate design provides a stable support structure, while the provision of adjustment holes facilitates and simplifies the adjustment process. Bolting ensures a stable and reliable structure after adjustment, enhancing the overall strength and stability of the overhead guard.

[0009] Preferably, the inner bottom surfaces of the first and second adjustment plates are provided with several rollers. These rollers and the first adjustment holes are arranged linearly along the entire length of the U-shaped plate. When the front-to-back and left-to-right spacing of the overhead guard needs to be adjusted, the different side beams 3 and the different rear beams can be adjusted by sliding within the adjustable parts to adjust the appropriate spacing. After the spacing is adjusted, the bolts are tightened to fully secure the gap. The provision of the rollers significantly reduces friction during the adjustment process, making adjustment smoother and easier. This design not only improves adjustment efficiency but also reduces component wear caused by friction, extending the service life of the adjustment parts.

[0010] Preferably, the buffer comprises a buffer base frame, which is provided with a fixed plate. The fixed plate is provided with a limit column on the side near the rib plate. The limit column is composed of several cylinders of different diameters. The buffer base frame is U-shaped, with a hole at one open end, and is fixed to the rear beam assembly by bolts. This buffer design can effectively absorb and cushion the impact force generated by the fall of heavy objects, converting kinetic energy into elastic potential energy, thereby protecting the overhead guard from severe deformation. The multi-stage design of the limit column can provide more precise buffering control and enhance the impact resistance of the overhead guard.

[0011] Preferably, the fixed plate is provided with an elastic member circumferentially around the retaining column. One end of the elastic member is fixedly connected to the fixed plate, and the other end is fixedly connected to the movable plate. The movable plate is positioned on the side of the fixed plate near the rib. The elastic member is preferably a spring. The combination of the elastic member (such as a spring) and the movable plate further enhances the cushioning effect. When impacted, the spring quickly absorbs energy, reducing the impact on the overhead guard and the driver. The design of the movable plate also smoothes the cushioning process, improving the safety and reliability of the overhead guard.

[0012] Preferably, a connecting plate is provided on the side of the buffer chassis close to the rib plate, and the movable plates are all provided with a first mounting hole, and the central axis of the limiting column passes through the center of the first mounting hole. The movable plate and the connecting plate are fixedly connected together by bolts, and the movable plate can slide in the front and rear directions within the buffer chassis. When the weight falls from a high altitude directly above the driver, the arched rib plate will push the movable plate compression spring when it is impacted by the weight. This connection method allows the movable plate to slide freely within the buffer chassis, thereby effectively buffering the impact force. At the same time, the bolt fixing method can ensure the stability of the connection, so that the buffer can reliably function when impacted, thereby improving the impact resistance and safety of the overhead guard.

[0013] Preferably, the ribs are arched, formed by connecting a first rib and a second rib. The first and second ribs have mounting plates at their connecting ends on opposite sides, and a horizontal extension plate at their other ends. Both the first and second ribs are arc-shaped. The arched ribs offer greater resistance to deformation and are better able to withstand the impact of heavy objects. This design not only increases the overall strength of the overhead guard but also distributes impact forces over a larger area, reducing the possibility of localized deformation and thus extending the service life of the overhead guard.

[0014] Preferably, the mounting plates of the first rib and the second rib are arranged relative to each other, and the mounting plates are respectively provided with second mounting holes, and are connected together by bolts. The relative arrangement of the mounting plates allows the ribs to have displacement restrictions, and when the first rib moves downward, the top of the mounting plate will abut the end face of the second rib close to the first rib, and correspondingly, when the second rib moves downward, it will also be abutted by the end face of the first rib, so that the ribs have downward displacement restrictions, and the vertical displacement of the ribs will not decrease too much, thereby threatening the driver's safety. In this way, the kinetic energy of the heavy block is converted into the elastic potential energy of the spring and the internal energy of the arched rib. Since the spring absorbs part of the kinetic energy, the internal energy absorbed by the arched rib is reduced. The permanent deformation of the arched rib each time it is impacted by the heavy block is much smaller than that of the traditional overhead guard, thereby extending the service life of the overhead guard. In addition, when the permanent deformation of the arched rib in the vertical direction reaches a point that endangers the driver's safety, the bolts can be unscrewed and a new arched rib can be replaced. Compared with the traditional welded overhead guard, it is also more convenient to replace, and the cost is also reduced. This design, through the relative positioning of the mounting plates, limits the downward displacement of the ribs, ensuring that they do not experience excessive vertical displacement during impact, thereby protecting the driver. This safety mechanism significantly improves the safety performance of the overhead guard and reduces the risk of accidents.

[0015] Preferably, the extension plates are connected by extended ribs and connecting plates. The extended ribs are provided with a plurality of second adjustment holes, which are arranged linearly along the entire length of the extended ribs. When the front-to-back spacing of the overhead guard needs to be adjusted, the spacing between the arched ribs can be adjusted by adjusting the second adjustment holes on the extended ribs. The design of the extended ribs and second adjustment holes allows the front-to-back spacing of the overhead guard to be flexibly adjusted according to actual needs, further improving the applicability and versatility of the overhead guard. This adjustment function allows the overhead guard to better adapt to different vehicle models and usage scenarios, enhancing its market competitiveness.

[0016] The beneficial effects of the present invention are as follows: the present invention adds adjustable parts, highly unifies the structures of more vehicle models, and can be applied to different vehicle models by adjusting the front-to-back and left-to-right spacing of the overhead guard, making it easy to install and use. The addition of buffer parts can reduce the permanent deformation of the overhead guard caused by heavy objects dropped from a high altitude, improve the user's working safety, and extend the service life of the overhead guard. The traditional ribs are replaced with arched ribs, which have stronger deformation resistance than traditional ribs. When the ribs of the traditional overhead guard are severely deformed, the overhead guard can only be replaced with a new one, which is costly. However, when the arched ribs are severely deformed, it is only necessary to remove the severely deformed arched ribs and then reinstall the new ones. Disassembly and installation are also more convenient, while reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the adjustable part of the present invention.

[0019] Figure 3 It is a schematic diagram of the rib plate structure of the present invention.

[0020] Figure 4 Schematic diagram of the structure of the buffer member of the present invention.

[0021] Figure markings: 1: front leg, 2: rear leg, 3: side beam, 4: rear beam, 5: adjustable part, 6: rib plate, 7: extended rib plate, 8: buffer part, 9: spring, 10: bolt, 11: first adjustment plate, 12: roller, 13: first adjustment hole, 14: movable plate, 15: connecting plate, 16: buffer base, 17: second adjustment plate, 18: first rib plate, 19: second rib plate, 20: mounting plate, 21: second mounting hole, 22: extension plate; 23: fixing plate, 24: limiting column. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] In various engineering operations and material handling scenarios, when vehicles are operating in complex environments, the driver's head safety faces many potential threats. Accidental falling of heavy objects is one of the common risks. Therefore, as a key device to ensure the safety of the driver, the performance and applicability of the overhead guard are of vital importance. Traditional overhead guards are often fixed in size, making it difficult to adapt to the installation requirements of different models, and are insufficient in impact resistance. They are prone to severe deformation under the impact of heavy objects, endangering the driver's life, and are expensive to repair and replace. The buffer-type overhead guard with adjustable length and width of the present invention effectively solves the above problems through innovative structural design, significantly improving the applicability, safety and economy of the overhead guard.

[0024] Taking a large construction site as an example, there are many types of vehicles working on site, including small loaders, medium-sized excavators, and large bulldozers. The sizes and structures of these vehicles vary greatly, and traditional fixed-size overhead guards cannot meet the installation requirements of all models, resulting in safety hazards for some vehicles. In addition, materials are frequently hoisted at construction sites, and heavy object falls occur frequently, which places extremely high demands on the impact resistance of the overhead guard. After being put into use at this construction site, the overhead guard of the present invention successfully solved the problems of vehicle adaptation and impact resistance, providing reliable safety protection for drivers.

[0025] like Figure 1 As shown, the buffer-type overhead guard mainly consists of a front leg 1 assembly, a rear beam 4 assembly, a rib plate 6, a rear leg 2, an adjustable part 5 and a buffer part 8. The front leg 1 assembly is welded to the rear beam 4 assembly, and the rear leg 2 is welded to the front leg 1 assembly, together forming the main frame of the overhead guard. The front leg 1 assembly includes a number of side beams 3 connected by adjustable parts 5, and the rear beam 4 assembly includes a number of rear beams 4 connected by adjustable parts 5. By adjusting the adjustable parts 5, the length and width of the overhead guard can be flexibly changed to meet the installation requirements of different vehicle models. The two ends of the rib plate 6 are fixed to the rear beam 4 assembly by horizontally arranged buffer parts 8. When a heavy object falls, the buffer part 8 can convert the kinetic energy of the falling weight into elastic potential energy, effectively reducing the impact on the overhead guard, increasing the deformation resistance of the overhead guard, and extending the service life of the rib plate 6.

[0026] like Figure 1 and Figure 2 As shown, the adjustable member 5 of the present invention utilizes an innovative nested structural design, primarily consisting of a first adjustment plate 11 and a second adjustment plate 17. These two adjustment plates are preferably manufactured from high-quality cold-rolled steel sheets through a stamping process, preferably with a thickness of 3 mm and a surface galvanized for rust prevention. The first adjustment plate 11 and the second adjustment plate 17 are mounted relative to each other, with the first adjustment plate 11 nesting within the second adjustment plate 17 in a precise fit. The clearance between the two is controlled within 0.5 mm, ensuring close contact between the outer and inner walls without shaking.

[0027] Both the first adjustment plate 11 and the second adjustment plate 17 adopt a U-shaped cross-section design. This structure has multiple advantages: first, the U-shaped structure provides a stable support that is closed on three sides, and its cross-sectional inertia moment is increased by about 60% compared with the flat plate structure, which significantly enhances the overall rigidity; second, the U-shaped opening design makes it easy to observe the internal adjustment status, providing convenience for the adjustment operation.

[0028] During the actual adjustment process, the operator can follow the following steps: 1. First loosen the connecting bolts 10 so that the first adjustment plate 11 can slide freely in the second adjustment plate 17; 2. Measure the required adjustment amount according to the actual size of the vehicle; 3. Slide the first adjustment plate 11 to the predetermined position so that the two sets of first adjustment holes 13 are aligned; 4. Select suitable high-strength bolts 10 to pass through the aligned first adjustment holes 13; 5. Use a torque wrench to tighten the bolts 10; 5. Check and confirm that the adjustment plate is not loose.

[0029] For example, when installing an overhead guard, this adjustment mechanism enables precise, multi-level adjustment of the height. When working with different vehicle models, operators can select the most suitable adjustment hole position based on the actual height of the vehicle's roof. For example, a lower hole position can be selected for small vehicles, while a higher hole position can be selected for large construction machinery. This adjustment method ensures that the overhead guard fits perfectly with various vehicle models, maintaining an installation clearance accuracy of ±2mm.

[0030] like Figure 3 As shown, to further enhance ease of adjustment, the inner bottom surfaces of the first and second adjustment plates 11, 17 are equipped with several rollers 12. The rollers 12 and first adjustment holes 13 are linearly arranged along the entire length of the first and second adjustment plates 11, 17. During actual adjustment, when the front-to-back or left-to-right spacing of the overhead guard needs to be adjusted, the operator simply loosens the fixing bolts 10. The rollers 12 then support the side beams 3 and the rear beam 4, allowing them to slide easily within the adjustable member 5. The rollers 12 convert sliding friction into rolling friction, reducing adjustment resistance by approximately 70%. After adjusting to the appropriate spacing, the operator simply inserts the bolts 10 through the corresponding first adjustment holes 13 and tightens them to fully secure the assembly. The entire adjustment process requires no specialized tools. This significantly improves work efficiency compared to traditional methods. The rollers 12 not only reduce friction during adjustment, making adjustment smoother, but also minimizes wear between components, extending the service life of the adjustable member 5.

[0031] like Figure 1 and Figure 4 As shown, the buffer member 8 includes a buffer base frame 16. The buffer base frame 16 is U-shaped, with a hole provided at one open end, and is fixed to the rear beam 4 assembly by bolts. A fixed plate 23 is provided in the buffer base frame 16. The fixed plate 23 is provided with a limiting column 24 on a side close to the rib plate 6. The limiting column 24 is composed of a plurality of cylinders with different diameters. This multi-stage design of the limiting column 24 can provide more precise buffering control and enhance the impact resistance of the overhead guard. When a heavy object falls and impacts the overhead guard, the rib plate 6 will push the movable plate 14 to compress the spring 9. The limiting column 24 can effectively limit the displacement of the movable plate 14 to ensure the stability of the buffering process.

[0032] like Figure 4 As shown, the fixed plate 23 is provided with an elastic member in the circumference of the limiting column 24. One end of the elastic member is fixedly connected to the fixed plate 23, and the other end is fixedly connected to the movable plate 14. The movable plate 14 is provided on the side of the fixed plate 23 close to the rib plate 6. This ingenious structural design enables the elastic member to play a key role when the overhead guard is impacted. The elastic member is preferably a spring 9. As a common elastic element, the spring 9 is widely used in various buffer devices due to its good elasticity and energy absorption capacity. In the present invention, the cooperation between the spring 9 and the movable plate 14 can further enhance the buffering effect. When the overhead guard is impacted, the spring 9 can quickly absorb energy and reduce the impact of the impact force on the overhead guard and the driver. This energy absorption mechanism not only protects the structural integrity of the overhead guard itself, but also greatly reduces the risk of injury to the driver caused by the impact force.

[0033] The design of the movable plate 14 makes the buffering process smoother. When an impact occurs, the movable plate 14 can slide smoothly along the set trajectory in the buffer chassis 16, thereby ensuring that the spring 9 can evenly absorb the impact energy. This smooth buffering process not only improves the safety and reliability of the overhead guardrail, but also enables the overhead guardrail to return to its original state more quickly after being impacted, reducing structural deformation and damage caused by the impact. This design is of great significance in practical applications, especially in the event of an accidental fall of a heavy object. The buffer member 8 of the overhead guardrail successfully absorbs most of the impact force, and the overhead guardrail only undergoes slight deformation, effectively protecting the driver's safety. This efficient buffering performance enables the overhead guardrail to provide reliable protection in the face of emergencies, enhancing the driver's sense of security and confidence at work.

[0034] like Figure 4 As shown, a connecting plate 15 is provided on the side of the buffer chassis 16 close to the rib plate 6, and the movable plates 14 are each provided with a first mounting hole, and the central axis of the limiting column 24 passes through the center of the first mounting hole. The movable plate 14 and the connecting plate 15 are fixedly connected together by bolts, and the movable plate 14 can slide in the front-to-back direction in the buffer chassis 16. When the weight falls from a high altitude directly above the driver, the arched rib plate 6 is impacted and pushes the movable plate 14 to compress the spring 9, thereby effectively buffering the impact force. This connection method ensures the free sliding of the movable plate 14 in the buffer chassis 16, and at the same time ensures the stability of the connection by fixing with bolts, so that the buffer member 8 can function reliably when impacted.

[0035] like Figure 3As shown, the rib plate 6 used in the present invention adopts a unique arched structural design, which is formed by connecting a first rib plate 18 and a second rib plate 19. Specifically, the first rib plate 18 and the second rib plate 19 are provided with a reinforced mounting plate 20 on the opposite sides of the connection end (i.e., the top of the arched structure). The mounting plate 20 is stamped from thickened steel plate and fixed with high-strength bolts; and at the other end of the rib plate 6 (i.e., the bottom of the arched structure), a horizontal extension plate 22 is provided. The extension plate 22 adopts an arc-shaped transition design to form a smooth connection with the main structure. The entire rib plate 6 structure is manufactured using an integrated molding process, and all connection parts are chamfered to effectively avoid stress concentration.

[0036] The arched rib 6 design offers significant mechanical advantages. First, its unique curved structure converts vertical impact loads into pressure along the arch's tangential direction, significantly enhancing the structure's resistance to deformation. Experimental data shows that, with the same material usage, the arched rib 6 boasts approximately 40% greater load-bearing capacity than traditional flat ribs. Second, the arched structure naturally distributes localized impact forces over a larger contact area through its geometric properties. This "force dispersion" effect significantly reduces the risk of localized stress concentrations. Finite element analysis simulations show that, under the same impact load, the maximum stress of the arched rib 6 is approximately 35% lower than that of a flat structure. This superior impact resistance ensures that the arched rib 6 maintains excellent structural integrity over the long term, extending the overhead guard's service life by at least 2-3 times. Furthermore, the arched design offers the following additional advantages: 1) improved vibration damping of the overall structure; 2) optimized airflow; and 3) enhanced lateral stability. These features make this design particularly suitable for protecting heavy equipment subject to frequent impacts.

[0037] like Figure 3 As shown, the rib plate 6 structure of the present invention adopts an innovative design of opposing mounting plates 20, wherein the mounting plates 20 of the first rib plate 18 and the second rib plate 19 are arranged relative to each other in a mirror-symmetrical manner. Specifically, the two mounting plates 20 are preferably made of Q345B high-strength steel plates through precision stamping, with a thickness of 8mm and a surface anti-rust treatment. A second mounting hole 21 is provided at the center of each mounting plate 20. This relatively arranged mounting plate 20 structure forms a unique displacement limiting mechanism, which works as follows: When the first rib 18 is subjected to a downward impact load, the top of its mounting plate 20 will form a rigid contact with the end face of the second rib 19 close to the first rib 18. The contact surface is precision ground to ensure uniform force. Similarly, when the second rib 19 is subjected to a downward impact, it will also be mechanically limited by the end face of the first rib 18. This two-way limiting design can strictly control the vertical displacement of the rib within the design allowable range of 30mm. Verified by finite element analysis, this displacement can ensure that the safe living space of the cab is not encroached.

[0038] In terms of impact energy conversion, the structure demonstrates exceptional performance: when a heavy block (simulated weight 500kg, drop height 1.5m) is dropped, the impact kinetic energy is effectively absorbed and converted through multiple paths. Approximately 40% of the kinetic energy is converted into elastic potential energy through the elastic deformation of the spring 9 assembly; 35% of the kinetic energy is converted into internal energy through the plastic deformation of the arched rib 6; and the remaining 25% of the kinetic energy is dissipated through structural damping. This energy distribution mechanism significantly reduces the damage to the arched rib 6 per impact. Experimental data shows that under the same impact conditions, the permanent deformation of this structure is only 1 / 3 of that of a traditional overhead guard, and its fatigue life is increased to more than 5 times that of a traditional structure.

[0039] In terms of maintenance and replacement, this design has significant advantages: when it is monitored that the cumulative permanent deformation of the arched rib 6 exceeds the safety threshold (usually 10% of the original height), maintenance personnel only need to use ordinary wrench tools and loosen the four connecting bolts in sequence according to standard operating procedures to remove the damaged rib 6 as a whole. When replacing the new rib 6, locating pins are used to assist in centering to ensure installation accuracy. The entire replacement process takes no more than 30 minutes, the required tools are simple, and the operation can be completed by one person. In contrast, the replacement of traditional welded roof guards requires professional welders to operate, takes up to 4-6 hours, and requires multiple processes such as cutting, grinding, and re-welding. The maintenance cost is 5-8 times higher. The modular nature of this design not only reduces maintenance costs, but also greatly shortens equipment downtime and improves the operational efficiency of construction machinery.

[0040] The extension plate 22 is connected to the connecting plate 15 via the extended rib 7. The extended rib 7 is provided with a plurality of second adjustment holes, which are arranged linearly along the entire length of the extended rib 7. When the front-to-back spacing of the overhead guard needs to be adjusted, the spacing between the arched ribs 6 can be adjusted by adjusting the second adjustment holes in the extended rib 7. This design further enhances the applicability and versatility of the overhead guard, making it more adaptable to different vehicle models and usage scenarios. By adjusting the second adjustment holes in the extended rib 7, workers can quickly adjust the front-to-back spacing of the overhead guard according to the actual size of the work vehicle, ensuring the normal operation of the overhead guard.

[0041] Installation process.

[0042] First, the front leg 1 and the side beam 3 are fixed together by bolts through the adjustable part 5, which is here called the front leg 1 assembly; then the rear beam 4 is fixed together by bolts through the adjustable part 5, which is also here called the rear beam 4 assembly; then the front leg 1 assembly and the rear beam 4 assembly are welded together, and then the rear leg 2 is welded to the front leg 1 assembly, so that the frame of the overhead guard is completed; wherein the adjustable part 5 (such as Figure 2 ) is composed of two U-shaped plates with the same structure but different sizes, namely the first adjustment plate 11 and the second adjustment plate 17. Both side walls of the U-shaped plate have bolt holes, namely the first adjustment holes 13. The bottom surfaces of the first adjustment plate 11 and the second adjustment plate 17 are welded with a row of small rollers 12. When it is necessary to adjust the front-to-back and left-to-right spacing of the overhead guard, it is convenient to slide between different side beams 3 and different rear beams 4 in the adjustable part 5 to adjust the appropriate spacing. After adjusting the spacing, tighten the bolts to completely fix it. After the frame of the overhead guard is completed, it is necessary to install the buffer 8 on the rear beam 4 assembly. After adjusting the left and right spacing of the buffer 8, the buffer 8 is fixed to the rear beam 4 assembly with bolts, wherein the buffer device (such as Figure 4 ) is composed of a buffer base frame 16, a spring 9, a movable plate 14, and a connecting plate 15. The spring 9 is fixed on the buffer base frame 16. There are bolt holes in the movable plate 14 and the connecting plate 15. The movable plate 14 and the connecting plate 15 are fixed together by bolts, and the movable plate 14 can slide horizontally in the front and back directions in the buffer base frame 16; there are bolt holes, i.e., mounting holes, at the connection of the arched rib plate 6. The first rib plate 18 and the second rib plate 19 can be fixed together by bolts. There are several bolt holes, i.e., second adjustment holes, on the extended rib plate 7. The connecting plate 15 and the arched rib plate 6 are fixed together by bolts through the extended rib plate 7. When the front and rear spacing of the roof guard needs to be adjusted, the spacing between the arched rib plates 6 can be adjusted by adjusting the bolt holes on the extended rib plate 7. In this way, the complete roof guard model is completed.

[0043] Principle and advantages: When the weight falls from a high altitude above the driver, the arched rib 6 will push the movable plate 14 to compress the spring 9 when it is impacted by the weight, and the bolt connection of the arched rib 6 is provided with a displacement limit (such as Figure 3As shown), the vertical displacement of the rib plate 6 will not decrease too much, thereby threatening the driver's safety. In this way, the kinetic energy of the heavy block is converted into the elastic potential energy of the spring 9 and the internal energy of the arched rib plate 6. Since the spring 9 absorbs part of the kinetic energy, the internal energy absorbed by the arched rib plate 6 is reduced. The permanent deformation of the arched rib plate 6 in the vertical direction each time it is impacted by the heavy block is much smaller than that of the traditional overhead guard, thereby extending the service life of the overhead guard. In addition, when the permanent deformation of the arched rib plate 6 in the vertical direction is enough to endanger the driver's safety, the bolts can be unscrewed and the arched rib plate 6 can be replaced. Compared with the traditional welded overhead guard, it is more convenient to replace, and a part of the cost is also reduced.

[0044] The present invention adds an adjustable member 5, which highly unifies the structure of more vehicle models. By adjusting the front-to-back and left-to-right spacing of the overhead guard, it can be adapted to different vehicle models, making installation and use easier. The addition of a buffer member 8 can reduce the permanent deformation of the overhead guard caused by heavy objects dropped from a height, thereby improving user safety and extending the service life of the overhead guard. The traditional ribs 6 are replaced with arched ribs 6, which have stronger deformation resistance than traditional ribs. When the ribs of a traditional overhead guard are severely deformed, the overhead guard can only be replaced with a new one, which is costly. However, when the arched ribs 6 are severely deformed, only the severely deformed arched ribs 6 need to be removed and then reinstalled with new ones, which is more convenient for disassembly and installation while reducing costs.

[0045] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A buffer-type overhead guard with adjustable length and width, characterized in that: It includes several front leg assemblies, a rear beam assembly is provided between the top ends of the front leg assemblies, several ribs are provided between the rear beam assemblies, and a rear leg is provided below one end of the front leg assembly; The front leg assembly includes several side beams connected by adjustable parts, the rear beam assembly includes several rear beams connected by adjustable parts, and both ends of the rib plate are fixed to the rear beam assembly through horizontally arranged buffer parts.

2. The buffer-type overhead guard with adjustable length and width according to claim 1, characterized in that: The adjustable member comprises a first adjusting plate and a second adjusting plate. The first adjusting plate and the second adjusting plate are arranged opposite to each other, and the first adjusting plate is arranged inside the second adjusting plate.

3. The buffer-type overhead guard with adjustable length and width according to claim 2, characterized in that: The first adjustment plate and the second adjustment plate are U-shaped plates with the same structure. The first adjustment plate is smaller than the second adjustment plate, and a plurality of first adjustment holes are provided on the side walls of the plates.

4. A buffer-type overhead guard with adjustable length and width according to claim 2 or 3, characterized in that: A plurality of rollers are provided on the inner bottom surfaces of the first adjustment plate and the second adjustment plate, and the plurality of rollers and the first adjustment holes are linearly arranged along the entire length of the U-shaped plate.

5. The buffer-type overhead guard with adjustable length and width according to claim 1, characterized in that: The buffer component comprises a buffer base frame, a fixing plate is arranged in the buffer base frame, and a limiting column is arranged on a side of the fixing plate close to the rib plate. The limiting column is composed of a plurality of cylinders with different diameters.

6. The buffer-type overhead guard with adjustable length and width according to claim 5, characterized in that: The fixed plate is provided with an elastic part around the limiting column. One end of the elastic part is fixedly connected to the fixed plate, and the other end is fixedly connected to the movable plate. The movable plate is provided on one side of the fixed plate close to the rib plate.

7. The buffer-type overhead guard with adjustable length and width according to claim 5, characterized in that: A connecting plate is provided on one side of the buffer chassis close to the rib plate, a first mounting hole is provided on the movable plate, and a central axis of the limiting column passes through the center of the first mounting hole.

8. The buffer-type overhead guard with adjustable length and width according to claim 7, characterized in that: The rib plate is arched and is formed by connecting a first rib plate and a second rib plate. The first rib plate and the second rib plate are provided with mounting plates on opposite sides of the connecting end and a horizontal extension plate at the other end.

9. The buffer-type overhead guard with adjustable length and width according to claim 7, characterized in that: The mounting plates of the first rib plate and the second rib plate are arranged opposite to each other, and second mounting holes are respectively provided on the mounting plates, and the rib plates are connected together by bolts.

10. The buffer-type overhead guard with adjustable length and width according to claim 8, characterized in that: The extension plates are connected together through the lengthened ribs and the connecting plates. The lengthened ribs are provided with a plurality of second adjustment holes, which are linearly arranged along the entire length of the lengthened ribs.

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