Folding type safety supporting device and dumper

Abstract

The utility model discloses a folding type safety supporting device and a dump truck, and relates to the technical field of dump trucks, in particular to the folding type safety supporting device and the dump truck, the folding type safety supporting device comprises a second supporting assembly and a second supporting assembly, one end of the second supporting assembly is arranged relative to a longitudinal beam of the dump truck in a rotating mode, and the relative rotating axis of the second supporting assembly and the longitudinal beam is perpendicular to the center line of the longitudinal beam; one end of the first supporting assembly is hinged to the other end of the second supporting assembly through a hinge assembly; according to the folding type safety supporting device and the dumper, through the supporting assembly arranged in a folding mode, the effective length of the supporting rod is effectively increased, the turnover angle of a container is increased, enough overhaul space is provided for the installation position of the supporting assembly, meanwhile, the locking assembly is additionally arranged, the supporting assembly is effectively prevented from being automatically folded in the supporting process, and supporting safety is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of dump trucks, and more specifically, to a foldable safety support device. In addition, the utility model also relates to a dump truck comprising the foldable safety support device. Background Art

[0002] The existing safety support device for dump trucks is installed in the space formed by the longitudinal beam 8 and the cross beam 9 of the auxiliary beam. Due to the spatial position, the length of the support rod in the support device is limited. Due to the insufficient length of the support rod, the supported cargo box is often not tilted at a large angle, and there is not enough space for inspection and maintenance at the safety support and the flipping point, which makes it easy to miss inspections and repairs, causing the dump truck to fail prematurely.

[0003] In summary, how to provide a foldable safety support device and a dump truck that can solve the problem of insufficient support rod length due to space limitation is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a foldable safety support device, which effectively increases the effective length of the support rod and the flipping angle of the cargo box through the support components arranged in a folding form, and provides sufficient maintenance space at the installation site of the support components. At the same time, a locking component is added to effectively prevent the support components from automatically folding during the support process, thereby effectively ensuring the safety of the support.

[0005] Another object of the utility model is to provide a dump truck including the above-mentioned foldable safety support device, which has the same technical features and can achieve the same technical purpose.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A foldable safety support device, used to support a cargo box of a dump truck in a tipped-up state, comprising:

[0008] A second support assembly, one end of which is connected to the longitudinal beam of the dump truck for relative rotation, and a relative rotation axis between the second support assembly and the longitudinal beam is perpendicular to a center line of the longitudinal beam;

[0009] A first support assembly, one end of which is hinged to the other end of the second support assembly through a hinge assembly, and when the first support assembly and the second support assembly are rotated to an angle of 180°, the hinged end surfaces of the first support assembly and the second support assembly abut against each other;

[0010] The locking assembly is arranged between the first supporting assembly and the second supporting assembly. When the first supporting assembly and the second supporting assembly are rotated to an included angle of 180°, the locking assembly can limit the relative rotation of the first supporting assembly and the second supporting assembly.

[0011] Preferably, the foldable safety support device further comprises a fixed mounting plate and a cross bar, wherein the fixed mounting plate and the cross bar are both transversely fixed between the two groups of longitudinal beams, and one end of the second support assembly away from the first support assembly is hinged to the fixed mounting plate;

[0012] When the first support assembly and the second support assembly are rotated to an angle of 0°, and the second support assembly and the longitudinal beam are rotated to an angle of 0°, the cross bar can support the first support assembly or the second support assembly from the bottom.

[0013] Preferably, the foldable safety support device also includes a limit plate, which is relatively fixed to the longitudinal beam. When the second support assembly and the longitudinal beam are rotated to an included angle reaching a maximum set angle, the limit plate abuts against the side wall of the second support assembly to prevent the second support assembly from continuing to rotate.

[0014] Preferably, the hinge assembly comprises a first rotating ring, a rotating shaft and a second rotating ring;

[0015] The side wall of the hinged end of the first support assembly is provided with a quarter-circular mounting groove A, and the first rotating ring is fixedly installed in the mounting groove A;

[0016] The side wall of the hinged end of the second support assembly is provided with a quarter-circular mounting groove B, and the second rotating ring is fixedly installed in the mounting groove B;

[0017] The rotating shaft is coaxially rotatably mounted with the first rotating ring and the second rotating ring.

[0018] Preferably, the locking assembly includes a first sleeve, a second sleeve and a plug-in shaft, the first sleeve is fixedly connected to the first support assembly, and the second sleeve is fixedly connected to the second support assembly; when the first support assembly and the second support assembly are rotated to an angle of 180°, the center line of the first sleeve and the center line of the second sleeve are collinear, and the plug-in shaft is inserted into the first sleeve and the second sleeve at the same time.

[0019] Preferably, the plug-in shaft and the first sleeve are coaxially slidably arranged, and a second limiting ring is fixedly provided at the middle position of the plug-in shaft, and a first limiting ring is provided at one end of the plug-in shaft inserted into the first sleeve;

[0020] When the center line of the first sleeve is colinear with the center line of the second sleeve, and the first limiting ring abuts against the end of the first sleeve, the other end of the plug-in shaft is inserted into the second sleeve;

[0021] When the center line of the first sleeve is colinear with the center line of the second sleeve, and the second limiting ring abuts against the end of the first sleeve, the other end of the plug-in shaft is disengaged from the second sleeve.

[0022] Preferably, the first support assembly comprises two groups of support rods arranged in parallel, and a plurality of transverse support rods are fixedly connected between the two groups of support rods.

[0023] Preferably, the second support assembly comprises two groups of support rods arranged in parallel, and a plurality of transverse support rods are fixedly connected between the two groups of support rods.

[0024] A dump truck comprises any one of the foldable safety support devices described above.

[0025] Compared with the prior art, the foldable safety support device provided by the utility model has at least the following beneficial effects:

[0026] 1. The first support assembly and the second support assembly are hinged so that they can be folded with each other, thereby increasing the overall effective length of the support assembly, thereby increasing the effective flipping angle of the cargo box, and increasing the space for the installation position of the support assembly, which is convenient for inspection and maintenance, and avoids missed inspections and repairs.

[0027] 2. When the hinge assembly is set, it is set on the side of the first support assembly and the second support assembly. When the first support assembly and the second support assembly are unfolded and subjected to force, the main force-bearing surface is the end surface of the first support assembly and the second support assembly, that is, the support force borne by the hinge assembly is small, so the hinge assembly has a longer service life;

[0028] 3. At the same time, a locking assembly is added. When the first support assembly and the second support assembly are unfolded for support, the locking assembly can effectively prevent the first support assembly and the second support assembly from folding, thereby ensuring the stability of the support.

[0029] The dump truck provided by the utility model comprises the above-mentioned foldable safety support device and has the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] Figure 1 This is a schematic diagram of the structure of the foldable safety support device provided by the utility model in a folded state;

[0032] Figure 2 This is a structural schematic diagram of another angle of the foldable safety support device provided by the utility model in the folded state;

[0033] Figure 3 This is a front view of the foldable safety support device provided by the utility model in a folded state;

[0034] Figure 4 This is a schematic diagram of the structure of the foldable safety support device provided by the utility model in the unfolded state;

[0035] Figure 5 This is a structural schematic diagram of another angle of the foldable safety support device provided by the utility model in the unfolded state;

[0036] Figure 6 This is a structural schematic diagram of the locking assembly provided by the utility model in a locked state;

[0037] Figure 7 This is a schematic diagram of the structure of the locking assembly provided by the utility model in the open state.

[0038] In the figure:

[0039] 1. First supporting assembly; 101. Mounting slot A; 2. Second supporting assembly; 201. Mounting slot B; 3. Fixed mounting plate; 4. Limiting plate; 5. Locking assembly; 501. First limiting ring; 502. Second limiting ring; 503. First sleeve; 504. Second sleeve; 505. Connecting shaft; 6. Articulated assembly; 601. First rotating ring; 602. Rotating shaft; 603. Second rotating ring; 7. Cross bar. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] The core of the utility model is to provide a foldable safety support device, which effectively increases the effective length of the support rod through the support components arranged in a folding form, increases the flipping angle of the cargo box, and provides sufficient maintenance space for the installation of the support components. At the same time, a locking component is added to effectively prevent the support components from automatically folding during the support process, thereby effectively ensuring the support safety.

[0042] Another core of the utility model is to provide a dump truck including the above-mentioned foldable safety support device, which has the same technical features and can achieve the same technical purpose.

[0043] Please refer to Figure 1-Figure 7 A foldable safety support device for supporting a cargo box of a dump truck in an overturned state, comprising:

[0044] The second support assembly 2 has one end connected to the longitudinal beam 8 of the dump truck for relative rotation, and the relative rotation axis between the second support assembly 2 and the longitudinal beam 8 is perpendicular to the center line of the longitudinal beam 8;

[0045] The first support assembly 1 has one end hinged to the other end of the second support assembly 2 through a hinge assembly 6. When the first support assembly 1 and the second support assembly 2 rotate to an angle of 180°, the hinged end surfaces of the first support assembly 1 and the second support assembly 2 abut against each other;

[0046] The locking assembly 5 is disposed between the first supporting assembly 1 and the second supporting assembly 2 . When the first supporting assembly 1 and the second supporting assembly 2 rotate to an angle of 180°, the locking assembly 5 can limit the relative rotation of the first supporting assembly 1 and the second supporting assembly 2 .

[0047] When the dump truck's cargo box flips, it is mainly driven by the oil cylinder. However, when it reaches the maximum flip angle, it needs to be supported by safety supports to prevent the cargo box from accidentally falling when maintenance personnel are repairing under the cargo box.

[0048] In the prior art, most safety supports are external auxiliary supports. Because a long safety support is arranged under the cargo box, it needs to occupy a large chassis space and is difficult to arrange due to the restrictions of the longitudinal beams 8 and the cross beams 9 in the chassis. A short safety support will cause the bottom space to be small after the cargo box is turned over, which is not conducive to the inspection of the vehicle chassis.

[0049] Therefore, in some embodiments, the Figure 1-Figure 5 The foldable safety support device shown in the figure adopts a method of folding and storing two groups of support components, which are arranged in the rectangular area surrounded by the longitudinal beam 8 and the cross beam 9 of the chassis, so as to effectively avoid the safety support from occupying too much chassis space when folded, and when the first support component 1 and the second support component 2 are unfolded, they have sufficient support length. After supporting the overturned cargo box, there is sufficient space under the cargo box, which is convenient for the inspection of the vehicle chassis and the safety support device itself.

[0050] At the same time, when the first support component 1 and the second support component 2 are working, their force transmission surfaces are contact end surfaces, which have better support stability compared to telescopic support components. Because of the telescopic support components, the two support components usually need to be limited by pins, and the pins are subjected to large shear forces, are easy to break, and have a relatively short service life.

[0051] At the same time, a locking assembly 5 is provided to limit the relative rotation of the first support assembly 1 and the second support assembly 2 in the expanded state, that is, to ensure the stable support of the first support assembly 1 and the second support assembly 2 in the supported state. In some embodiments, a locking assembly 5 is added to the hinge assembly 6. When the rotation angle of the hinge assembly 6 is 180°, its rotation is limited, thereby limiting the relative rotation of the first support assembly 1 and the second support assembly 2 in the expanded state. This implementation manner also belongs to the protection scope of the present application and should be protected by the present application.

[0052] In some embodiments, the foldable safety support device further includes a fixed mounting plate 3 and a cross bar 7, both of which are transversely fixed between the two sets of longitudinal beams 8, and one end of the second support assembly 2 away from the first support assembly 1 is hinged to the fixed mounting plate 3;

[0053] When the first support assembly 1 and the second support assembly 2 rotate to an angle of 0°, and the second support assembly 2 and the longitudinal beam 8 rotate to an angle of 0°, the cross bar 7 can support the first support assembly 1 or the second support assembly 2 from the bottom;

[0054] like Figure 3 As shown, a fixed mounting plate 3 is installed between the two longitudinal beams 8 of the chassis to facilitate the installation of the support assembly without damaging the original structure of the longitudinal beams 8 and the cross beams 9. At the same time, a cross bar 7 is added to lift the folded support assembly, thereby avoiding the bottoming problem caused by its natural sagging and not affecting the passability of the vehicle chassis;

[0055] Meanwhile, in some embodiments, by designing the thickness of the support assembly, such as the sum of the thickness of the first support assembly 1 and the second support assembly 2 is not greater than the thickness of the longitudinal beam 8, when the support assembly is installed in the area surrounded by the longitudinal beam 8 and the cross beam 9, the upper and lower surfaces of the folded support assembly do not exceed the upper and lower surfaces of the longitudinal beam 8, and do not affect the layout of other components of the chassis, thereby reducing the impact on the chassis design.

[0056] In some embodiments, the foldable safety support device further includes a limit plate 4, which is relatively fixed to the longitudinal beam 8. When the second support assembly 2 and the longitudinal beam 8 rotate to an angle reaching a maximum set angle, the limit plate 4 abuts against the side wall of the second support assembly 2 to prevent the second support assembly 2 from continuing to rotate;

[0057] like Figure 4As shown, when the cargo box is flipped to the working angle, the first support assembly 1 and the second support assembly 2 rotate relative to each other to an angle of 180°. At this time, the support assembly supports the cargo box, but before the support assembly contacts and supports the cargo box, it is necessary to ensure that there is a fixed angle between the support assembly and the longitudinal beam 8, so as to ensure that each time the support assembly contacts and supports the cargo box, it has the same contact support point and the same flipping angle as the cargo box. Therefore, a bent plate is used as a limit plate 4, which is fixedly set on the crossbeam 9 at the root of the second support assembly 2. When the second support assembly 2 rotates to the maximum angle with the longitudinal beam 8, the upper end face of the limit plate 4 abuts against the side wall of the second support assembly 2, thereby limiting the second support assembly 2 from continuing to rotate relative to the longitudinal beam 8, making it stationary, thereby ensuring that each time the support assembly is working, it has the same angle with the longitudinal beam 8, thereby ensuring that the support assembly and the cargo box have a fixed support contact point, that is, the cargo box has a fixed flipping angle for the supporting state.

[0058] In some embodiments, the hinge assembly 6 includes a first rotating ring 601 , a rotating shaft 602 , and a second rotating ring 603 ;

[0059] A quarter-circular mounting groove A101 is provided on the side wall of the hinged end of the first support assembly 1, and the first rotating ring 601 is fixedly installed in the mounting groove A101;

[0060] A quarter-circular mounting groove B201 is provided on the side wall of the hinged end of the second support assembly 2, and the second rotating ring 603 is fixedly installed in the mounting groove B201;

[0061] The rotating shaft 602 is coaxially rotatably mounted with the first rotating ring 601 and the second rotating ring 603;

[0062] By respectively providing a quarter circular mounting groove on the side of the hinged end of the first support assembly 1 and the second support assembly 2, the mounting grooves of the two form a half circle, which helps to make the axis of the rotating shaft 602 coplanar with the side walls of the first support assembly 1 and the second support assembly 2, that is, in the folded state, the angle between the first support assembly 1 and the second support assembly 2 can be adjusted to 0°, and the side walls of the first support assembly 1 and the second support assembly 2 can fit each other, thereby reducing the space occupied by the support assembly to a greater extent.

[0063] In some embodiments, the locking assembly 5 includes a first sleeve 503, a second sleeve 504 and a plug-in shaft 505, the first sleeve 503 is fixedly connected to the first support assembly 1, and the second sleeve 504 is fixedly connected to the second support assembly 2; when the first support assembly 1 and the second support assembly 2 are rotated to an angle of 180°, the center line of the first sleeve 503 and the center line of the second sleeve 504 are collinear, and the plug-in shaft 505 is inserted into the first sleeve 503 and the second sleeve 504 at the same time;

[0064] like Figure 6-Figure 7 As shown, the center line of the first sleeve 503 is parallel to the center line of the first support assembly 1, and the center line of the second sleeve 504 is parallel to the center line of the second support assembly 2; the center lines of the first sleeve 503 and the second sleeve 504 are always coplanar, and when the center lines of the first support assembly 1 and the second support assembly 2 are colinear, the center lines of the first sleeve 503 and the second sleeve 504 are also colinear. At this time, inserting the plug-in shaft 505 into the first sleeve 503 and the second sleeve 504 can limit the bending of the first support assembly 1 and the second support assembly 2, that is, ensure the support stability of the support assembly;

[0065] In some embodiments, the center line of the first sleeve 503 is perpendicular to the center line of the first support assembly 1, and the center line of the second sleeve 504 is perpendicular to the center line of the second support assembly 2; the center lines of the first sleeve 503 and the second sleeve 504 are always parallel. When the center lines of the first support assembly 1 and the second support assembly 2 are collinear, the center lines of the first sleeve 503 and the second sleeve 504 are also collinear. The locking assembly 5 and the hinge assembly 6 are respectively arranged on both sides of the support assembly. At this time, inserting the plug-in shaft 505 into the first sleeve 503 and the second sleeve 504 can also limit the bending of the first support assembly 1 and the second support assembly 2.

[0066] In some embodiments, the plug-in shaft 505 is coaxially slidably arranged with the first sleeve 503, and a second stop ring 502 is fixedly disposed at the middle position of the plug-in shaft 505, and a first stop ring 501 is disposed at one end of the plug-in shaft 505 inserted into the first sleeve 503;

[0067] When the center line of the first sleeve 503 is colinear with the center line of the second sleeve 504 and the first limiting ring 501 abuts against the end of the first sleeve 503, the other end of the plug-in shaft 505 is inserted into the second sleeve 504;

[0068] When the center line of the first sleeve 503 is colinear with the center line of the second sleeve 504 and the second limiting ring 502 abuts against the end of the first sleeve 503 , the other end of the plug-in shaft 505 is separated from the second sleeve 504 .

[0069] like Figure 6-Figure 7 By adding stop rings at the middle and end positions of the plug shaft 505, the plug shaft 505 can slide relative to the first sleeve 503 and cannot be separated from the first sleeve 503, and when the center lines of the first sleeve 503 and the second sleeve 504 are colinear, the plug shaft 505 can be synchronously inserted into the second sleeve 504, thereby avoiding the problem of the plug shaft 505 being lost after separation;

[0070] In some embodiments, an electromagnetic push rod is added between the plug-in shaft 505 and the first sleeve 503, that is, the plug-in shaft 505 and the first sleeve 503 are driven to slide relative to each other through the action of the electromagnetic push rod, that is, each locking and disconnection of the locking assembly 5 can be electronically controlled without the need for manual operation by the operator.

[0071] In some embodiments, the first support assembly 1 includes two groups of support rods arranged in parallel, and a plurality of transverse support rods are fixedly connected between the two groups of support rods;

[0072] The second support assembly 2 includes two groups of support rods arranged in parallel, and a plurality of transverse support rods are fixedly connected between the two groups of support rods;

[0073] Through the above structural design, the rigidity of the first support assembly 1 and the second support assembly 2 in the support direction is increased to ensure stable support.

[0074] At the same time, in some embodiments, by adding a motor or other driving mechanism between the first support assembly 1 and the second support assembly 2, the angle between the first support assembly 1 and the second support assembly 2 is automatically controlled; and by adding a motor or other driving mechanism between the second support assembly 2 and the longitudinal beam (8), the angle between the second support assembly 2 and the longitudinal beam (8) is automatically controlled, thereby achieving full automatic control of the support assembly without the need for manual operation. The other driving mechanism is preferably a cylinder or oil cylinder with both ends hinged to the object of action, which can be connected to the vehicle-mounted air source or oil circuit, has a simple layout, and is relatively low in cost. The above scheme should also be protected by this application.

[0075] In addition to the foldable safety support device disclosed in the above embodiments, the utility model also provides a dump truck including the above foldable safety support device. For the structures of other parts of the dump truck, please refer to the prior art and will not be described in detail herein.

[0076] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0077] The foldable safety support device and dump truck provided by the utility model are introduced in detail above. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A foldable safety support device for supporting a cargo box of a dump truck in an overturned state, characterized in that: include: A second support assembly (2), one end of which is connected to the longitudinal beam (8) of the dump truck for relative rotation, and the relative rotation axis between the second support assembly (2) and the longitudinal beam (8) is perpendicular to the center line of the longitudinal beam (8); One end of the first support assembly (1) is hinged to the other end of the second support assembly (2) via a hinge assembly (6), and when the first support assembly (1) and the second support assembly (2) are rotated to an included angle of 180°, the hinged end surfaces of the first support assembly (1) and the second support assembly (2) abut against each other; A locking assembly (5) is arranged between the first supporting assembly (1) and the second supporting assembly (2), and when the first supporting assembly (1) and the second supporting assembly (2) are rotated to an included angle of 180°, the locking assembly (5) is capable of limiting the relative rotation of the first supporting assembly (1) and the second supporting assembly (2).

2. The foldable safety support device according to claim 1, characterized in that: It also comprises a fixed mounting plate (3) and a cross bar (7), wherein the fixed mounting plate (3) and the cross bar (7) are both transversely fixed between the two groups of longitudinal beams (8), and an end of the second support assembly (2) away from the first support assembly (1) is hinged to the fixed mounting plate (3); When the first support assembly (1) and the second support assembly (2) are rotated to an angle of 0°, and the second support assembly (2) and the longitudinal beam (8) are rotated to an angle of 0°, the cross bar (7) is capable of supporting the first support assembly (1) or the second support assembly (2) from the bottom.

3. The foldable safety support device according to claim 1, characterized in that: It also comprises a limit plate (4), the limit plate (4) being fixed relative to the longitudinal beam (8), and when the second support assembly (2) and the longitudinal beam (8) rotate until the included angle reaches a maximum set angle, the limit plate (4) abuts against the side wall of the second support assembly (2) to prevent the second support assembly (2) from continuing to rotate.

4. The foldable safety support device according to claim 1, characterized in that: The hinge assembly (6) comprises a first rotating ring (601), a rotating shaft (602) and a second rotating ring (603); A quarter-circular mounting groove A (101) is provided on the side wall of the hinged end of the first support assembly (1), and the first rotating ring (601) is fixedly mounted in the mounting groove A (101); A quarter-circular mounting groove B (201) is provided on the side wall of the hinged end of the second support assembly (2), and the second rotating ring (603) is fixedly mounted in the mounting groove B (201); The rotating shaft (602) is coaxially rotatably mounted with the first rotating ring (601) and the second rotating ring (603).

5. The foldable safety support device according to claim 1, characterized in that: The locking assembly (5) comprises a first sleeve (503), a second sleeve (504) and a plug-in shaft (505); the first sleeve (503) is fixedly connected to the first supporting assembly (1), and the second sleeve (504) is fixedly connected to the second supporting assembly (2); when the first supporting assembly (1) and the second supporting assembly (2) are rotated to an angle of 180°, a center line of the first sleeve (503) and a center line of the second sleeve (504) are collinear, and the plug-in shaft (505) is inserted into the first sleeve (503) and the second sleeve (504) at the same time.

6. The foldable safety support device according to claim 5, characterized in that: The plug-in shaft (505) and the first sleeve (503) are coaxially slidably arranged, and a second limiting ring (502) is fixedly provided at the middle position of the plug-in shaft (505), and a first limiting ring (501) is provided at one end of the plug-in shaft (505) inserted into the first sleeve (503); When the center line of the first sleeve (503) and the center line of the second sleeve (504) are colinear, and the first limiting ring (501) abuts against the end of the first sleeve (503), the other end of the plug-in shaft (505) is inserted into the second sleeve (504); When the center line of the first sleeve (503) is colinear with the center line of the second sleeve (504), and the second limiting ring (502) abuts against the end of the first sleeve (503), the other end of the plug-in shaft (505) is disengaged from the second sleeve (504).

7. The foldable safety support device according to any one of claims 1 to 6, characterized in that: The first support assembly (1) comprises two groups of support rods arranged in parallel, and a plurality of transverse support rods are fixedly connected between the two groups of support rods.

8. The foldable safety support device according to any one of claims 1 to 6, characterized in that: The second support assembly (2) comprises two groups of support rods arranged in parallel, and a plurality of transverse support rods are fixedly connected between the two groups of support rods.

9. A dump truck, characterized in that: A foldable safety support device comprising any one of claims 1 to 8.

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