Quick insertion type rear protective fence for loading machine

Abstract

The invention discloses a quick-insertion type rear protective fence for a loader. The quick-insertion type rear protective fence comprises a protective fence device, a left stand column device, a right stand column device, an upper hinge seat device, a lower hinge seat device, a locking seat device and a locking pin device. The left stand column device and the right stand column device are installed above a rear frame and a counterweight assembly of the loading machine and used for supporting the protective fence device. The protective fence device is installed on the rear side of a loader hood, the protective fence device is connected with the left stand column device through an upper hinge seat device and a lower hinge seat device, and the right stand column device is connected with a locking seat device used for locking. The locking seat device and the lower hinge seat device are provided with a locking pin device used for limiting and stopping the protective fence device. The hinge can be quickly inserted into the hinge seat and is fixed through the snap spring, and a nut does not need to be disassembled and assembled; rapid installation and replacement are achieved, the installation and disassembly time of the protective fence is greatly shortened, and the working efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of loaders, and more particularly to a quick-release rear guardrail for loaders. Background Technology

[0002] Loaders, as core construction machinery, are widely used in complex working conditions such as loading sand and gravel and tunnel construction. The working environment has limited visibility and high collision risk. As a key component to ensure equipment safety and reduce accident losses, the rear guardrail's protective reliability and ease of use directly affect work efficiency and operating costs.

[0003] Most current mainstream loader rear guardrails are made of welded steel pipe posts, rigidly connected to a counterweight by bolts. While this meets basic protection requirements, it suffers from several major drawbacks: First, the disassembly and assembly process is cumbersome and complex. Maintenance requires using a forklift to lift and tighten the guardrail and counterweight separately, then disassembling multiple bolts one by one. This tedious and time-consuming process significantly reduces equipment maintenance efficiency. Second, the protective structure lacks adaptability. The traditional fixed structure cannot flexibly accommodate different vehicle models, cannot be modularized, and results in high production costs. Third, most existing guardrails are connected using complex connecting devices such as tie rods, failing to address the core issue of low disassembly and assembly efficiency and thus failing to meet the actual needs of loaders for frequent maintenance and rapid operation. Summary of the Invention

[0004] Purpose of the invention: To address the shortcomings and defects of existing technologies, this invention provides a quick-connect rear guardrail for loaders. It features a pin-connected design for rapid insertion into a hinged seat and is secured by a snap ring, eliminating the need to remove nuts. This allows for quick installation and replacement, significantly reducing the time required for guardrail installation and disassembly, and improving work efficiency.

[0005] Technical Solution: The present invention provides a quick-connect rear guardrail for a loader, characterized in that it includes a guardrail device, left and right upright posts, upper and lower hinged seats, a locking seat device, and a locking pin device; the left and right upright posts are installed above the loader's rear frame and counterweight assembly to support the guardrail device; the guardrail device is installed on the rear side of the loader's hood, and the guardrail device is connected to the left upright post via the upper and lower hinged seats; a locking seat device for locking is connected to the right upright post; the locking seat device and the lower hinged seat device are equipped with locking pin devices for limiting and stopping the movement of the guardrail device.

[0006] The guardrail device includes a guardrail body welded from steel pipes, an upper hinge plate and a lower hinge plate welded to the guardrail body for mounting the upper and lower hinge seat devices, pins welded to the upper and lower hinge plates for connecting with the upper and lower hinge seat devices and allowing the guardrail body to rotate horizontally, grease nipples installed above the pins for adding lubricating oil, baffles welded to the guardrail body for limiting the horizontal rotation angle of the guardrail body, and a rubber shock-absorbing sleeve fitted onto the end of the steel pipe near the locking seat section of the guardrail body.

[0007] The left and right column devices include square tubes welded to the base plate. A sealing plate is welded to the upper opening of the square tube to ensure that the square tube is sealed. The base plate is installed on the rear frame or the counterweight system by base plate mounting bolts. A reinforcing rib is welded between the base plate and the square tube. A pad is welded to the side of the square tube for fixing with the upper and lower hinge seat devices and the locking seat device.

[0008] The upper and lower hinge seat device includes a mounting plate, an upper mounting plate, and a lower mounting plate. Both the upper and lower mounting plates are provided with guide grooves for positioning with the mounting plate and then welding them together to form an integrated structure. The integrated structure is fixed to the pad of the left column device by hinge seat mounting bolts.

[0009] The locking seat device includes a fixed base plate and a fixed top plate, which are welded together in a T-shape and are connected to the pad of the right column device by adjusting shims, locking seat mounting bolts, and the pad of the right column device.

[0010] The locking pin device includes a locking pin body, which is installed in the mounting holes reserved in the locking seat device and the lower hinge seat device; the locking pin body is provided with a spring, a steel ball and a spring coil.

[0011] The upper and lower hinge seat devices and locking seat devices are connected and fixed to the left and right column devices through pads; the upper and lower hinge seat devices are mounting plates and mounting base plates welded together, and a guide groove for positioning the mounting plate is reserved on the mounting base plate; the locking seat devices are fixed base plates and fixed top plates welded together in a T-shape, and elongated holes are opened on the mounting plate and fixed base plates; thus, both the upper and lower hinge seat devices and the locking seat devices can move along the axial direction of the left and right column devices to adapt to the uneven mounting surface of the rear frame or counterweight.

[0012] The guardrail body is integrally welded from steel pipes, ensuring strength while meeting lightweight requirements. This avoids a shift in the center of gravity due to excessive weight. A notch is provided in the middle of the guardrail to allow for a wider range of recognition by the reversing camera and rearview mirror, better identifying road conditions behind and preventing safety hazards caused by poor visibility. Furthermore, upper and lower hinge plates are welded to the guardrail body, with a pin (5) welded between them. This pin connects to the hinge seat and locking seat. The pin is fixed by a retaining ring. When replacing the guardrail body, simply removing the retaining ring allows for direct removal of the guardrail body, greatly improving the speed of installation and disassembly. The pin passes through a washer.

[0013] The fixed base plate and fixed top plate are provided with locking pin mounting holes. When the guardrail body is closed, the locking pin body is inserted into the mounting hole of the locking seat device to lock the guardrail body. The lower hinge plate and lower mounting seat plate are also provided with locking pin mounting holes. When the guardrail body is open, the locking pin body is inserted into the mounting holes of the upper and lower hinge seat devices to stop the guardrail body, thus achieving a dual function of one pin.

[0014] The present invention provides a loader, characterized in that: the loader uses a quick-release rear guardrail of the present invention.

[0015] Beneficial Effects: Compared with existing technologies, this invention has the following significant advantages: The guardrail of this invention uses a pin connection, allowing for quick insertion into the hinge seat and fixation via a snap ring, eliminating the need to remove nuts; this enables rapid installation and replacement, significantly shortening the installation and disassembly time of the guardrail and improving work efficiency. The height of the left and right pin connections is adjustable, suitable for uneven installation surfaces on the rear frame or counterweight, increasing the guardrail's adaptability and compatibility with multiple brands and specifications of machines, preventing the guardrail from becoming idle after machine model changes and improving resource utilization. A notch in the middle of the guardrail provides a wider, unobstructed reversing camera view, allowing pedestrians to clearly see and assess the condition of the vehicle behind the loader through the rearview mirror, thus avoiding blind spots for the driver caused by the guardrail obstructing their view, improving driving safety. Furthermore, the guardrail body is welded from steel pipes, featuring a lightweight, integrated design that facilitates modular production. The locking pin serves a dual purpose: it locks the guardrail when closed and, when open, the pin inserts into the stop hole to stop the guardrail. The simplified structure reduces the number of parts and assembly steps, making the overall structure more compact. Switching between the two functions can be completed without changing different pins, reducing operation steps, making it easier for drivers to operate, and improving work efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the upper and lower hinge seat device of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the left and right column base device of the present invention;

[0019] Figure 4 This is a schematic diagram of the locking seat device of the present invention;

[0020] Figure 5 This is a schematic diagram of the protective barrier device of the present invention;

[0021] Figure 6 This is a schematic diagram of the installation structure of the guardrail device and the upper and lower hinge seat device of the present invention.

[0022] Figure 7 This is a schematic diagram of the locking state of the locking pin device of the present invention;

[0023] Figure 8 This is a schematic diagram of the locking pin device of the present invention in its stopped state;

[0024] Figure 9 This is a partial structural diagram of the locking pin device of the present invention in its stopped state;

[0025] Figure 10 This is a schematic diagram of the locking pin device of the present invention;

[0026] Figure 11 This is a partial cross-sectional view of the locking pin device of the present invention. Figure 1 ;

[0027] Figure 12 This is a partial cross-sectional view of the locking pin device of the present invention. Figure 2 ;

[0028] Figure 13 This is a schematic cross-sectional view of the pin structure of the present invention. Figure 1 ;

[0029] Figure 14 This is a schematic cross-sectional view of the pin structure of the present invention. Figure 2 ;

[0030] Figure 15 This is a schematic diagram of the structure of the lower mounting plate of the present invention;

[0031] Figure 16 This is a schematic diagram of the locking seat device of the present invention;

[0032] In the diagram, 1 is the guardrail body; 2 is a square tube; 3 is a sealing plate; 4 is a grease fitting; 5 is a pin; 6 is an upper hinge plate; 7 is a washer; 8 is a snap ring; 9 is a lower hinge plate; 10 is a hinge seat mounting bolt; 11 is a mounting plate; 12 is a pad; 13 is a reinforcing rib; 14 is a base plate mounting bolt; 15 is a base plate; 16 is a fixed base plate; 17 is an adjusting shim; 18 is a locking seat mounting bolt; 19 is a fixed top plate; 20 is a locking pin body; 21 is a baffle; 22 is a rubber shock absorber sleeve; 23 is a spring; 24 is a steel ball; 25 is a spring coil; 26 is an upper mounting seat plate; and 27 is a lower mounting seat plate. Detailed Implementation

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1 to 16 As shown, the loader quick-insertion rear guardrail of the present invention is installed at the rear end of the loader hood to resist rear collisions and debris impacts, prevent damage to key assemblies such as the engine, hydraulic oil tank, and radiator, and reduce maintenance costs.

[0035] The guardrail device of the present invention includes a guardrail body 1; a grease fitting 4; a pin 5; an upper hinge plate 6; a lower hinge plate 9; a baffle 21; and a rubber shock-absorbing sleeve 22. The guardrail body 1 is welded from multiple steel pipes of different specifications, featuring an integrated design that simplifies the process, reduces the number of parts and assembly steps, shortens the production cycle, and makes the center of gravity of the entire machine easier to control. A notch is left in the center of the guardrail to provide a wider and unobstructed reversing camera range, increasing driving safety. An upper hinge plate 6 and a lower hinge plate 9 are welded to the upper left side of the guardrail body 1. A circular hole is provided in the center of the hinge plate for the pin 5 to pass through, and the pin 5 is welded to the upper and lower hinge plates. Figure 13 , Figure 14 The pin 5 shown has a lubrication passage in the middle, and lubricating oil can be added through the grease nipple 4 installed above the pin 5. A baffle 21 is welded to the right side of the guardrail body 1 to limit the horizontal rotation angle of the guardrail device. A rubber shock-absorbing sleeve 22 is installed on the side of the guardrail that contacts the locking seat to reduce the impact between the guardrail and the locking seat on rough terrain, and to prevent damage to the surface paint film or fatigue damage due to long-term impact.

[0036] like Figure 3As shown, the left and right upright assembly includes: a square tube 2; a sealing plate 3; a pad 12; a reinforcing rib 13; and a base plate 15. The base plate 15 has threaded holes for mounting to the pre-reserved mounting position on the rear frame via base plate mounting bolts 14. The square tube 2 is welded to the base plate 15, and a sealing plate 3 is welded to the top of the square tube 2 to seal it, preventing rainwater, dust, and oil from entering the interior of the square tube 2, preventing internal corrosion and oxidation, and extending the service life of the square tube 2. Furthermore, a reinforcing rib 13 is installed at the junction of the square tube 2 and the base plate 15 to distribute concentrated stress and improve the bending and torsional resistance of the square tube 2. A pad 12 for mounting the hinge seat and locking seat is welded to the side of the square tube 2.

[0037] like Figure 2 As shown, the upper and lower hinge seat assembly includes: a mounting plate 11; an upper mounting plate 26; and a lower mounting plate 27; wherein the upper mounting plate 26 and the lower mounting plate 27 are respectively welded to the mounting plate 11 and fixed to the pad 12 by hinge seat mounting bolts 10.

[0038] like Figure 4 As shown, the locking seat device includes: a locking seat device 4; a fixed base plate 16; and a fixed top plate 19. The fixed base plate 16 and the fixed top plate 19 are welded together in a T-shape, making the welding position easy to adjust, the splicing method simple, and the structure highly adaptable. It is then installed onto the pad 12 by adjusting the shims 17 and the locking seat mounting bolts 18.

[0039] like Figure 6 As shown, a washer 7 is provided between the upper hinge plate 6 and the lower hinge plate 9 of the upper and lower hinge seat assembly. Elongated holes are provided on the mounting plate 11 and the fixed base plate 16, allowing the upper and lower hinge seats and locking seats to move slightly along the axial direction of the square tube. When installed on an uneven rear frame or counterweight, the guardrail assembly can be manually leveled by selecting different sizes of washers 7 or by moving the bolts in the elongated holes. This increases the adaptability of the guardrail, making it compatible with multiple brands and specifications of vehicles, preventing the guardrail from becoming idle after vehicle model changes, and improving resource utilization. (Reference) Figure 1 and Figure 6 After the crash barrier structure is installed on the hinge seat, the pin 5 is fixed to the upper and lower hinge seats by the snap ring 8.

[0040] like Figure 7 As shown, the fixed base plate 16 and fixed top plate 19 are provided with locking pin mounting holes. When the guardrail is closed, the locking pin is inserted into the corresponding mounting hole to lock the guardrail. Figure 8 , Figure 9As shown, locking pin mounting holes are also provided on the lower hinge plate 9 and the lower mounting base plate 27. When the guardrail is open, the locking pin is inserted into the corresponding mounting hole to stop the guardrail, keeping it in the open state for easy maintenance. This structure achieves dual functionality with a single pin, simplifying the internal structure, reducing the number of parts and mounting points, lowering system complexity, and simplifying the operation process to suit high-frequency operation scenarios.

[0041] like Figure 10 , Figure 11 , Figure 12 As shown, the locking pin device includes a locking pin body 20; a spring 23; a steel ball 24; and a spring coil 25. The locking pin body 20 has a through hole for the spring coil 25 to pass through, allowing the locking pin shaft to be pulled up via the spring coil 25, making installation and removal of the locking pin more convenient. A tapered hole is provided at the bottom of the locking pin, and the spring 23 and steel ball 24 are installed inside the tapered hole, forming a ball-locking pin mechanism. The spring 23 pre-tightens the contact surface between the steel ball 24 and the mating part to achieve rapid locking. To unlock, simply pull the pin body; the steel ball 24 contacts the contact surface of the mating part, compressing the spring 23, causing the steel ball 24 to retract, thus completing rapid opening and closing. This locking pin structure offers efficient locking, requires no tools, and can be completed manually in 1-2 steps, making it suitable for high-frequency disassembly scenarios.

[0042] This invention's guardrail features a pin-connected design, allowing for quick insertion into the hinged seat and securing with a snap ring, eliminating the need to remove nuts. This enables rapid installation and replacement, significantly reducing installation and disassembly time and improving work efficiency. The height of the left and right pin connections is adjustable, making it suitable for uneven installation surfaces on the rear frame or counterweight, increasing the guardrail's adaptability and compatibility with multiple brands and models. This prevents the guardrail from becoming idle after model changes, improving resource utilization. A notch in the middle of the guardrail provides a wider, unobstructed view for the reversing camera, allowing pedestrians to clearly see and assess the situation behind the loader through the rearview mirror. This avoids blind spots for the driver caused by the guardrail obstructing their view, improving driving safety. Furthermore, the guardrail's main body is welded from steel pipes, featuring a lightweight, integrated design that facilitates modular production. The locking pin serves a dual purpose: it locks the guardrail when closed and, when open, inserts into a stop hole to stop the guardrail. The simplified structure reduces the number of parts and assembly steps, making the overall structure more compact. Switching between the two functions can be completed without changing different pins, reducing operation steps, making it easier for drivers to operate, and improving work efficiency.

Claims

1. A quick-release rear guardrail for a loader, characterized in that: It includes a guardrail device, left and right upright posts, upper and lower hinged seat devices, a locking seat device, and a locking pin device; the left and right upright posts are installed above the loader's rear frame and counterweight assembly to support the guardrail device; the guardrail device is installed on the rear side of the loader's hood, and the guardrail device is connected to the left upright post via the upper and lower hinged seat devices, while the right upright post is connected to a locking seat device for locking; the locking seat device and the lower hinged seat device are equipped with locking pin devices for limiting and stopping the movement of the guardrail device.

2. The quick-release rear guardrail for loaders according to claim 1, characterized in that: The guardrail device includes a guardrail body (1) welded from steel pipes, an upper hinge plate (6) and a lower hinge plate (9) welded to the guardrail body (1) for mounting the upper and lower hinge seat devices, a pin (5) welded to the upper and lower hinge plates for connecting with the upper and lower hinge seat devices and allowing the guardrail body (1) to rotate horizontally, a grease nipple (4) installed above the pin (5) for adding lubricating oil, a baffle (21) welded to the guardrail body (1) for limiting the horizontal rotation angle of the guardrail body (1), and a rubber shock-absorbing sleeve (22) sleeved on the end of the steel pipe near the locking seat section of the guardrail body (1).

3. The quick-release rear guardrail for loaders according to claim 1, characterized in that: The left and right column devices include a square tube (2) welded to the base plate (15). A sealing plate (3) is welded to the upper opening of the square tube (2) to ensure that the square tube (2) is sealed. The base plate is installed above the rear frame or the counterweight system by base plate mounting bolts (14). A reinforcing rib (13) is welded between the base plate (15) and the square tube (2). A pad (12) is welded to the side of the square tube (2) for fixing with the upper and lower hinge seat devices and the locking seat device.

4. The quick-release rear guardrail for loaders according to claim 1, characterized in that: The upper and lower hinge seat device includes a mounting plate (11), an upper mounting plate (26) and a lower mounting plate (27); both the upper mounting plate (26) and the lower mounting plate (27) are provided with guide grooves for positioning with the mounting plate (11) and then welding together to form an integrated structure. The integrated structure is fixed to the pad plate (12) of the left column device by hinge seat mounting bolts (10).

5. The quick-release rear guardrail for loaders according to claim 1, characterized in that: The locking seat device includes a fixed base plate (16) and a fixed top plate (19). The fixed base plate (16) and the fixed top plate (19) are welded together in a T-shaped structure and are connected to the pad plate (12) of the right column device by adjusting the shim (17), the locking seat mounting bolt (18).

6. The quick-release rear guardrail for loaders according to claim 1, characterized in that: The locking pin device includes a locking pin body (20), which is installed in the mounting holes reserved in the locking seat device and the lower hinge seat device; the locking pin body (20) is provided with a spring (23), a steel ball (24) and a spring ring (25).

7. The quick-release rear guardrail for loaders according to claim 5, characterized in that: The upper and lower hinge seat device and the locking seat device are connected and fixed to the left and right column devices through the pad plate (12); the upper and lower hinge seat device is a mounting plate (11) and a mounting base plate welded together, and a guide groove for positioning the mounting plate (11) is reserved on the mounting base plate; the locking seat device is a fixed base plate (16) and a fixed top plate (19) welded together in a T-shaped structure, and an elongated hole is opened on the mounting plate (11) and the fixed base plate (16); thus, both the upper and lower hinge seat device and the locking seat device can move along the axial direction of the left and right column devices to adapt to the uneven mounting surface of the rear frame or counterweight.

8. The quick-release rear guardrail for loaders according to claim 2, characterized in that: The pin (5) is fixed by a retaining ring (8). When replacing the guardrail body (1), the retaining ring (8) can be removed to directly pull out the guardrail body (1). The pin (5) passes through the washer (7).

9. The quick-release rear guardrail for loaders according to claim 5, characterized in that: The fixed base plate (16) and fixed top plate (19) are provided with locking pin mounting holes. When the guardrail body (1) is closed, the locking pin body (20) is inserted into the mounting hole of the locking seat device to lock the guardrail body (1). Locking pin mounting holes are also provided on the lower hinge plate (9) and lower mounting seat plate (27). When the guardrail body (1) is opened, the locking pin body (20) is inserted into the mounting hole of the upper and lower hinge seat devices to stop the guardrail body (1), thus achieving two uses of one pin.

10. A loader, characterized in that: The loader quick-connect rear guardrail used according to any one of claims 1-9.

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