阅读说明：本技术 一种带有安全限位装置的工件翻转系统及矿用自卸车 (Workpiece overturning system with safety limiting device and mining dump truck ) 是由 秦红义 韩磊 李国庆 高新功 冯勋壮 王周 于 2020-07-21 设计创作，主要内容包括：本发明公开了一种带有安全限位装置的工件翻转系统及矿用自卸车,工件翻转系统包括基座、工件、安全限位装置、翻转操作系统；工件铰接在所述基座上；翻转操作系统的一端与所述基座相铰接,另一端与所述工件相铰接,通过翻转操作系统实现工件在基座上翻转；安全限位装置安装在所述基座上,当工件向上翻转预设角度后通过安装限位装置对工件进行支撑,当工件向下降落到基座上后,安全限位装置恢复原位,等待下一次对工件向上翻转后的安全限位。本发明能够实现工件的翻转、限位、降落等功能,本发明既可以应用于车辆上驾驶室、机罩、大箱等类似部件的翻转限位,也可应用于厂房、车间里的类似大部件的翻转,操作方便、安全、可靠。(The invention discloses a workpiece overturning system with a safety limiting device and a mining dump truck, wherein the workpiece overturning system comprises a base, a workpiece, the safety limiting device and an overturning operation system; the workpiece is hinged on the base; one end of the overturning operation system is hinged with the base, the other end of the overturning operation system is hinged with the workpiece, and the workpiece is overturned on the base through the overturning operation system; the safety limiting device is installed on the base, supports the workpiece through the installation limiting device after the workpiece is upwards overturned by a preset angle, and restores to the original position after the workpiece falls onto the base downwards to wait for the next safety limiting after the workpiece is upwards overturned. The invention can realize the functions of overturning, limiting, descending and the like of the workpiece, can be applied to the overturning and limiting of similar components such as a cab, a hood, a big box and the like on a vehicle, can also be applied to the overturning of similar large components in a factory building and a workshop, and has convenient, safe and reliable operation.)

1. The utility model provides a work piece upset system with safe stop device which characterized in that includes:

a base;

a workpiece hinged to the base;

one end of the overturning operation system is hinged with the base, the other end of the overturning operation system is hinged with the workpiece, and the workpiece is overturned on the base through the overturning operation system;

the safety limiting device is installed on the base, supports the workpiece through the installation limiting device after the workpiece is upwards overturned by a preset angle, and restores to the original position after the workpiece falls onto the base downwards to wait for the next safety limiting after the workpiece is upwards overturned.

2. The workpiece turnover system with the safety limiting device as set forth in claim 1, wherein:

safety stop device includes:

support legs, the lower part of which is connected with the base;

the supporting arm is arranged at the upper part of the supporting leg and is hinged with the supporting leg;

one end of the return spring is connected with the supporting leg, the other end of the return spring is connected with the supporting arm, and the supporting arm can be automatically pulled back under the condition that no external force acts on the supporting arm, so that the top surface of the supporting leg is contacted with the supporting arm to play a role in supporting a workpiece; after the supporting arm rotates by a preset angle under the action of external force, the supporting arm is loosened after the workpiece passes over the supporting arm, and the supporting arm returns to the original position under the action of the return spring.

3. The workpiece turnover system with the safety limiting device as set forth in claim 2, wherein:

the support arm includes:

the support plate is a right-angle bending plate, a roundabout bend is arranged at the bottom of the right-angle bending plate, and a plurality of return spring connecting holes are formed in a vertical plate at the lower part of the right-angle bending plate;

the rotating pin sleeve is welded at the roundabout bending part, and the rotating pin penetrates through the rotating pin sleeve and a rotating pin hole formed in the supporting leg, so that the supporting arm can rotate around the rotating pin;

and the handle is welded on the upper horizontal plate of the right-angle bending plate, and the support plate is rotated through the handle.

4. The workpiece turnover system with the safety limiting device as set forth in claim 3, wherein:

a clamping groove is formed in the position, located at the end of the upper horizontal plate, of the handle and used for limiting the clamping plate located on the side face of the workpiece and close to the bottom face.

5. The workpiece turnover system with the safety limiting device as set forth in claim 2, wherein:

the supporting leg is a U-shaped plate, two side plates of the U-shaped plate are provided with corresponding rotating pin holes, and the supporting leg is hinged with the supporting arm through a fixed rotating pin;

and a plurality of return spring connecting holes are formed in the bottom plate of the U-shaped plate.

6. The workpiece turnover system with the safety limiting device as set forth in claim 5, wherein:

one side plate in the U-shaped plate is higher than the bottom plate of the U-shaped plate, a limiting pin hole is formed in the higher part of the U-shaped plate, and a positioning pin is arranged in the limiting pin hole and used for limiting the rotating angle of the supporting arm.

7. The workpiece turnover system with the safety limiting device as set forth in claim 1, wherein:

the overturning operation system comprises a manual hydraulic pump, a lifting cylinder, an operating rod, an oil return pipe and an oil inlet pipe;

the manual hydraulic pump is connected with the lifting cylinder through an oil inlet pipe and an oil return pipe to control the extension and the shortening of the lifting cylinder;

and two ends of the lifting cylinder are respectively connected with the workpiece and the base.

8. The workpiece turnover system with the safety limiting device as set forth in claim 7, wherein:

install the sleeve pipe in the supporting leg among the safety stop device, be equipped with the concentric through-hole with the sleeve pipe on the support arm among the safety stop device, the action bars is placed in the sleeve pipe when not using, and wears out from the through-hole for the restriction support arm motion prevents the maloperation, and reduces rocking of support arm when the vehicle motion.

9. The workpiece turnover system with the safety limiting device as set forth in claim 1, wherein:

the workpiece comprises a workpiece body, a hinge hole, a flat fixed seat, a clamping plate and a lifting seat I;

the base comprises a base body, a supporting column, a hinge seat and a lifting seat II;

two hinge holes are respectively formed in two ends of the rear side of the bottom surface of the workpiece body, two hinge seats are respectively formed in two ends of the rear side of the top surface of the base body, a hinge pin penetrates through the hinge holes, and two ends of the hinge pin are fixed on the hinge seats through mounting bolts;

two flat fixing seats are respectively arranged at two ends of the front side of the bottom surface of the workpiece body, the clamping plate is arranged on one flat fixing seat, two supporting columns are respectively arranged at two ends of the front side of the top surface of the base body, and the flat fixing seats are contacted with the supporting columns to realize the support of the base on the workpiece;

and a lifting cylinder in the overturning operation system is hinged between the lifting seat I and the lifting seat II.

10. A mining dump truck is characterized in that:

a workpiece turnover system with a safety limiting device as set forth in any one of claims 1 to 9;

wherein, the work piece is the driver's cabin, and the base is the frame.

Technical Field

The invention relates to a workpiece overturning system with a safety limiting device, and belongs to the field of overturning systems.

Background

The articulated dumper is provided with a front frame and a rear frame, the front frame is provided with a power source and a control center, the rear frame is provided with a cargo carrying device, the front frame and the rear frame are connected through an articulated body, the front frame and the rear frame can rotate and incline relatively, the torsional bending deformation of the frames is greatly reduced, and the turning radius is reduced. The hinged dumper is widely applied to small mining areas with narrow spaces, much rain, muddy roads and rugged roads.

The front frame of the articulated dump truck is provided with an engine, a gearbox, a cab, a hydraulic system, an oil tank and other parts, and the articulated dump truck is particularly compact, and a plurality of parts are positioned at the bottom of the cab, so that the inspection is inconvenient, and the cab is generally required to have a turnover function. The existing structure supports the cab bottom and the frame through a safety rod after the cab is turned up, two pin shafts need to be manually installed for connection, and the structure is troublesome to operate and unsafe.

Disclosure of Invention

Aiming at the existing problems, the invention provides a workpiece overturning system with a safety limiting device. The workpiece overturning system can be applied to overturning limitation of similar components such as a cab, a hood, a large box and the like on a vehicle, and can also be applied to overturning of similar large components in a factory building and a workshop.

The invention is realized according to the following technical scheme:

a workpiece turnover system with a safety limiting device comprises:

a base;

a workpiece hinged to the base;

one end of the overturning operation system is hinged with the base, the other end of the overturning operation system is hinged with the workpiece, and the workpiece is overturned on the base through the overturning operation system;

the safety limiting device is installed on the base, supports the workpiece through the installation limiting device after the workpiece is upwards overturned by a preset angle, and restores to the original position after the workpiece falls onto the base downwards to wait for the next safety limiting after the workpiece is upwards overturned.

Further, safety stop device includes:

support legs, the lower part of which is connected with the base;

the supporting arm is arranged at the upper part of the supporting leg and is hinged with the supporting leg;

one end of the return spring is connected with the supporting leg, the other end of the return spring is connected with the supporting arm, and the supporting arm can be automatically pulled back under the condition that no external force acts on the supporting arm, so that the top surface of the supporting leg is contacted with the supporting arm to play a role in supporting a workpiece; after the supporting arm rotates by a preset angle under the action of external force, the supporting arm is loosened after the workpiece passes over the supporting arm, and the supporting arm returns to the original position under the action of the return spring.

Further, the support arm includes:

the support plate is a right-angle bending plate, a roundabout bend is arranged at the bottom of the right-angle bending plate, and a plurality of return spring connecting holes are formed in a vertical plate at the lower part of the right-angle bending plate;

the rotating pin sleeve is welded at the roundabout bending part, and the rotating pin penetrates through the rotating pin sleeve and a rotating pin hole formed in the supporting leg, so that the supporting arm can rotate around the rotating pin;

and the handle is welded on the upper horizontal plate of the right-angle bending plate, and the support plate is rotated through the handle.

Furthermore, a clamping groove is formed in the position of the handle located at the end of the upper horizontal plate and used for limiting the clamping plate located on the side face of the workpiece and close to the bottom face.

Furthermore, the supporting leg is a U-shaped plate, two side plates of the U-shaped plate are provided with corresponding rotating pin holes, and the supporting leg is hinged with the supporting arm through a fixed rotating pin; and a plurality of return spring connecting holes are formed in the bottom plate of the U-shaped plate.

Furthermore, one side plate in the U-shaped plate is higher than the bottom plate of the U-shaped plate, a limiting pin hole is formed in the higher part of the U-shaped plate, and a positioning pin is arranged in the limiting pin hole and used for limiting the rotating angle of the supporting arm.

Further, the overturning operation system comprises a manual hydraulic pump, a lifting cylinder, an operating rod, an oil return pipe and an oil inlet pipe; the manual hydraulic pump is connected with the lifting cylinder through an oil inlet pipe and an oil return pipe to control the extension and the shortening of the lifting cylinder; and two ends of the lifting cylinder are respectively connected with the workpiece and the base.

Further, install the sleeve pipe in the supporting leg among the safety stop device, be equipped with the concentric through-hole with the sleeve pipe on the support arm among the safety stop device, the action bars is placed in the sleeve pipe when not using, and wears out from the through-hole for the restriction support arm motion prevents the maloperation, and reduces rocking of support arm when the vehicle motion.

Further, the workpiece comprises a workpiece body, a hinge hole, a flat fixed seat, a clamping plate and a lifting seat I; the base comprises a base body, a supporting column, a hinge seat and a lifting seat II; two hinge holes are respectively formed in two ends of the rear side of the bottom surface of the workpiece body, two hinge seats are respectively formed in two ends of the rear side of the top surface of the base body, a hinge pin penetrates through the hinge holes, and two ends of the hinge pin are fixed on the hinge seats through mounting bolts; two flat fixing seats are respectively arranged at two ends of the front side of the bottom surface of the workpiece body, the clamping plate is arranged on one flat fixing seat, two supporting columns are respectively arranged at two ends of the front side of the top surface of the base body, and the flat fixing seats are contacted with the supporting columns to realize the support of the base on the workpiece; and a lifting cylinder in the overturning operation system is hinged between the lifting seat I and the lifting seat II.

A mining dump truck is provided with the workpiece overturning system with the safety limiting device; wherein, the work piece is the driver's cabin, and the base is the frame.

The invention has the beneficial effects that:

the invention can realize the functions of overturning, limiting, descending and the like of a workpiece, the supporting arm can rotate around the rotating pin and can automatically return to the original position under the action of the return spring, the clamping groove arranged on the supporting arm is matched with the clamping plate arranged on the workpiece to realize the safety limiting of the workpiece, the operating rod is placed in the sleeve arranged on the supporting leg when not in use to play a role of limiting the movement of the supporting arm and prevent misoperation, and in addition, the swinging of the supporting arm during the movement of the vehicle can be reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In the drawings:

FIG. 1 is a schematic view of a workpiece turnover system according to the present invention;

FIG. 2 is a workpiece structure according to the present invention;

fig. 3 is a structure of the safety limiting device (a is a perspective view, and b is a sectional view) of the invention;

FIG. 4 is a partial structure of the safety stop device according to the present invention;

FIG. 5 is a supporting leg structure of the safety limiting device according to the present invention (a is a first view, b is a second view);

FIG. 6 is a view of the support arm structure of the safety restraint apparatus of the present invention;

FIG. 7 is a workpiece turnover handling system according to the present invention;

FIG. 8 illustrates a pin structure according to the present invention;

FIG. 9 illustrates a safety stop according to the present invention supporting a workpiece;

FIG. 10 illustrates a workpiece and base hinge according to the present invention;

fig. 11 illustrates the operation of the workpiece turning and supporting and limiting according to the present invention.

Description of reference numerals:

1. a base; 2. a workpiece; 3. a safety limiting device; 4. turning over an operating system; 5. a pin shaft; 6. installing a bolt;

1-1, a base body; 1-2, a support column; 1-3, a hinged seat;

2-1, a workpiece body; 2-2, hinge holes; 2-3, a flat fixed seat; 2-4, clamping plate; 2-5, lifting the seat I;

3-1, supporting legs; 3-2, a support arm; 3-3, a return spring; 3-4, rotating the pin; 3-5 positioning pins; 3-6, a handle; 3-7, a clamping groove; 3-8, connecting holes of return springs; 3-9, rotating the pin sleeve; 3-10, rotating pin holes; 3-11 parts of limiting pin holes, 3-12 parts of sleeves, 3-13 parts of supporting plates;

4-1, a manual hydraulic pump; 4-2, lifting the cylinder; 4-3, operating rod; 4-4, an oil return pipe; 4-5, oil inlet pipe; 4-6, and a pin.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, a workpiece turnover system with a safety limiting device comprises a base 1, a workpiece 2, a safety limiting device 3 and a turnover operation system 4; the workpiece 2 is hinged on the base 1; one end of the overturning operation system 4 is hinged with the base 1, the other end of the overturning operation system is hinged with the workpiece 2, and the workpiece 2 is overturned on the base 1 through the overturning operation system 4; safety limiting device 3 is installed on base 1, support work piece 2 through installation limiting device 3 after work piece 2 upwards overturns and predetermines the angle, descend back on base 1 when work piece 2, and safety limiting device 3 resumes the normal position, waits for next safety spacing after upwards overturning work piece 2.

It should be noted that the base 1 may be a frame of a vehicle or a platform of a workshop or the like, and the workpiece 2 may be a cab, a hood, or a similar large workpiece on the vehicle.

As shown in fig. 2 and 10, the workpiece 2 comprises a workpiece body 2-1, a hinge hole 2-2, a flat fixed seat 2-3, a clamping plate 2-4 and a lifting seat i 2-5; the base 1 comprises a base body 1-1, a support column 1-2, a hinged base 1-3 and a lifting base II; two hinge holes 2-2 are respectively formed in two ends of the rear side of the bottom surface of the workpiece body 2-1, two hinge seats 1-3 are respectively formed in two ends of the rear side of the top surface of the base body 1-1, a pin shaft 5 penetrates through the hinge holes 2-2, and two ends of the pin shaft 5 are fixed on the hinge seats 1-3 through mounting bolts 6; two flat fixed seats 2-3 are respectively arranged at two ends of the front side of the bottom surface of the workpiece body 2-1, the clamping plate 2-4 is arranged on one flat fixed seat, two supporting columns 1-2 are respectively arranged at two ends of the front side of the top surface of the base body 1-1, and the flat fixed seats 2-3 are contacted with the supporting columns 1-2 to realize the support of the base 1 on the workpiece 2; and a lifting cylinder 4-2 in the overturning operation system 4 is hinged between the lifting seat I2-5 and the lifting seat II.

It should be noted that, as shown in fig. 8, two ends of the pin 5 are flat structures, and the flat portions thereof are provided with through holes for the installation bolts 6 to penetrate.

As shown in fig. 3a and 3b, the safety limiting device 3 comprises a supporting leg 3-1, a supporting arm 3-2 and a return spring 3-3; the lower part of the supporting leg 3-1 is connected with the base 1; the supporting arm 3-2 is arranged at the upper part of the supporting leg 3-1 and is hinged with the supporting leg 3-1; one end of the return spring 3-3 is connected with the supporting leg 3-1, and the other end is connected with the supporting arm 3-2, so that the supporting arm 3-2 can be automatically pulled back under the condition that no external force acts on the supporting arm 3-2, the top surface of the supporting leg 3-1 is contacted with the supporting arm 3-2, and the function of supporting the workpiece 2 is achieved; after the supporting arm 3-2 is rotated by a predetermined angle by an external force (as shown in fig. 3b, by pushing the supporting arm by an arrow) so that the workpiece 2 passes over the supporting arm 3-2, the supporting arm 3-2 is released and the supporting arm 3-2 is returned to its original position by the action of the return spring 3-3.

As shown in fig. 6, the support arm 3-2 includes a support plate 3-13, a rotation pin bushing 3-9, and a handle 3-6; the supporting plate 3-13 is a right-angle bending plate, a roundabout bend is arranged at the bottom of the right-angle bending plate, and a plurality of return spring connecting holes 3-8 are formed in a vertical plate at the lower part of the right-angle bending plate; the rotating pin sleeve 3-9 is welded at the roundabout bending part, and the rotating pin 3-4 penetrates through the rotating pin sleeve 3-9 and a rotating pin hole 3-10 arranged on the supporting leg 3-1, so that the supporting arm 3-2 can rotate around the rotating pin 3-4; the handles 3-6 are welded on the upper horizontal plate of the right-angle bent plate, and the supporting plates 3-13 are rotated through the handles 3-6. And clamping grooves 3-7 are formed in the positions of handles 3-6 at the end part of the upper horizontal plate and used for limiting the clamping plates 2-4 which are positioned on the side surfaces of the workpiece 2 and close to the bottom surface.

As shown in fig. 5a and 5b, the supporting leg 3-1 is a U-shaped plate, two side plates of the U-shaped plate are provided with corresponding rotating pin holes 3-10, and the supporting leg is hinged with the supporting arm 3-2 by fixing a rotating pin 3-4; a plurality of return spring connecting holes 3-8 are arranged on the bottom plate of the U-shaped plate; the bottom plate of the U-shaped plate is also provided with a sleeve 3-12 for placing an operating rod 4-3.

It should be noted that reinforcing rib plates are welded between two side plates of the U-shaped plate, wherein the upper part is a vertical reinforcing rib plate, and the middle part is a horizontal reinforcing rib plate.

As shown in figure 4, one side plate of the U-shaped plate is higher than the bottom plate of the U-shaped plate, a limiting pin hole 3-11 is arranged at the higher part, and a positioning pin 3-5 is arranged in the limiting pin hole 3-11 and used for limiting the rotation angle of the supporting arm 3-2 and preventing the rotation angle from being too large and the pulling force of the return spring 3-3 from being too large to cause injury to an operator.

As shown in fig. 7, the turnover operation system 4 comprises a manual hydraulic pump 4-1, a lifting cylinder 4-2, an operation rod 4-3, an oil return pipe 4-4, an oil inlet pipe 4-5 and a pin 4-6; the manual hydraulic pump 4-1 is a power source of the turnover operation system 4 and is connected with the lifting cylinder 4-2 through an oil inlet pipe 4-5 and an oil return pipe 4-4, the manual hydraulic pump 4-1 has a reversing function and controls the extension and the shortening of the lifting cylinder 4-2, and two ends of the lifting cylinder 4-2 are respectively connected with a lifting seat I2-5 arranged on the workpiece 2 and a lifting seat II of the base through pins 4-6. The operation lever 4-3 is used to operate the manual hydraulic pump 4-1. The supporting leg 3-1 in the safety limiting device 3 is provided with a sleeve 3-12, a through hole concentric with the sleeve 3-12 is arranged on the supporting arm 3-2 in the safety limiting device 3, the operating rod 4-3 is placed in the sleeve 3-12 when not in use and penetrates out of the through hole, as shown in the position of figure 3, after the operating rod 4-3 is placed at the position, the function of limiting the movement of the supporting arm 3-2 is achieved, misoperation is prevented, and in addition, the shaking of the supporting arm 3-2 during the movement of a vehicle can be reduced.

As shown in figure 9, the safety limiting device 3 supports the workpiece 2, and the clamping plate 2-4 is clamped into the clamping groove arranged on the supporting arm 3-2, so that the limiting is safe and reliable.

As shown in fig. 11, the operation method of the workpiece turning and supporting safety limit is as follows:

firstly, taking out the operating rod 4-3, installing the operating rod on a manual hydraulic pump 4-1 shown in figure 7, extending the lifting cylinder 4-6 by pressing the operating rod 4-3, slowly turning over the workpiece 2, and after turning over to a certain angle, firstly contacting the upper edge of the clamping plate 2-4 with the supporting arm 3-2, as shown in figure 11 (a); as the workpiece 2 continues to turn, the push support arm 3-2 also starts to turn, as shown in fig. 11 (b); after the workpiece 2 is turned over and exceeds the supporting arm 3-2, the supporting arm 3-2 returns to the original position under the action of the return spring 3-3, as shown in fig. 11 (c); then, the workpiece 2 is slowly descended by adjusting the manual hydraulic pump 4-1 until the clamping plate 2-4 contacts the clamping groove 3-7 arranged on the supporting arm 3-2, and the workpiece 2 can be safely limited.

If the limit is to be released, the workpiece 2 is lowered and the operations are performed in the reverse order of the operations shown in fig. 11, and the arrows are also performed in the reverse direction. Firstly, operating the manual lifting pump 4-1 to turn the workpiece 2 upwards by a certain angle, as shown in fig. 11 (d); then, the supporting arm 3-2 is pushed by force in the direction opposite to the arrow shown in fig. 11 (c), so that the supporting arm rotates for a certain angle until the clamping plate 2-4 is not blocked to descend; the workpiece 2 is slowly descended by adjusting the manual hydraulic pump 4-1, as shown in fig. 11 (b); the workpiece 2 continues to descend, after the clamping plate 2-4 passes over the supporting arm 3-2, the supporting arm 3-2 is loosened, the workpiece 2 returns to the original position under the action of the return spring 3-3, and the workpiece 2 continues to descend until the flat fixed seat 2-3 of the workpiece 2 contacts the base 1; the operating rod 4-3 is pulled down and placed in a sleeve 3-12 arranged on the supporting leg 3-1.

In conclusion, the invention can realize the functions of overturning, limiting, descending and the like of a workpiece, the supporting arm can rotate around the rotating pin and can automatically return to the original position under the action of the return spring, the clamping groove arranged on the supporting arm is matched with the clamping plate arranged on the workpiece to realize the safety limiting of the workpiece, the operating rod is placed in the sleeve arranged on the supporting leg when not in use to play a role of limiting the movement of the supporting arm and prevent misoperation, and in addition, the swinging of the supporting arm during the movement of the vehicle can be reduced.

The invention also discloses a mining dump truck which is provided with the workpiece overturning system with the safety limiting device; wherein, the work piece is the driver's cabin, and the base is the frame.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are also meant to be within the scope of the invention and form different embodiments. For example, in the above embodiments, those skilled in the art can use the combination according to the known technical solutions and technical problems to be solved by the present application.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.