Rear fender for dump truck and dump truck for paving work

Abstract

The utility model provides a kind of rear protective device for self-unloading truck and self-unloading truck of road paving operation belongs to road paving field, it includes protective plate and drive assembly, protective plate is foldable and is located at the bottom of the frame of self-unloading truck, protective plate is lifted to form the state of being folded up, the lower side of protective plate forms protective state;Drive assembly includes telescopic cylinder, fixed plate, swing plate, fixed plate is located at the frame of self-unloading truck, swing plate one end is hinged with fixed plate by first hinged shaft, other end is fixedly connected with protective plate, the cylinder body of telescopic cylinder is hinged with fixed plate by second hinged shaft, the power output end of telescopic cylinder is hinged with the middle part of swing plate by third hinged shaft, with the telescopic of telescopic cylinder, swing plate drives protective plate to switch between first state and second state.Compared with prior art, the utility model solves the technical problem that the protective device of current self-unloading truck cannot meet the requirements of ground clearance and protective effect simultaneously.

Description

Technical Field

[0001] This utility model belongs to the field of road paving, and more specifically, it relates to a rear protection device for dump trucks. This utility model also relates to a dump truck for road paving operations. Background Technology

[0002] Currently, dump trucks are widely used in road paving operations, meaning the vehicles must be used in conjunction with pavers. While conventional rear safety devices on dump trucks meet the required ground clearance, they cannot be used in conjunction with the paver rollers due to their ground clearance height. The rear safety device must be removed before use, but once removed, it cannot be reinstalled and therefore provides no protection while the vehicle is in motion, posing a danger to pedestrians, the driver, and the vehicle itself. Current rear safety devices meet regulatory ground clearance requirements, but they are unsuitable for use when the paver rollers' ground clearance exceeds these requirements. Utility Model Content

[0003] The purpose of this utility model is to provide a rear protective device for dump trucks to solve the technical problem that current dump truck protective devices cannot simultaneously meet the requirements for ground clearance and protective function.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a rear protective device for dump trucks, comprising: A protective plate, which is foldable and located at the bottom of the frame of the dump truck, has a first state and a second state. In the first state, the protective plate is raised to form a retracted state, and in the second state, the protective plate is lowered to form a protective state. The drive assembly includes a telescopic cylinder, a fixed plate, a swing plate, a first hinge shaft, a second hinge shaft, and a third hinge shaft. The fixed plate is mounted on the frame of the dump truck. One end of the swing plate is hinged to the fixed plate via the first hinge shaft, and the other end is fixedly connected to a protective plate. The cylinder body of the telescopic cylinder is hinged to the fixed plate via the second hinge shaft. The power output end of the telescopic cylinder is hinged to the middle of the swing plate via the third hinge shaft. The first hinge shaft, the second hinge shaft, and the third hinge shaft are all parallel to the length direction of the protective plate. As the telescopic cylinder extends and retracts, the swing plate causes the protective plate to switch between a first state and a second state.

[0005] In one feasible implementation, the telescopic cylinder is a pneumatic cylinder, and the drive assembly further includes a solenoid valve and a control switch. The control switch, the solenoid valve, and the chassis of the dump truck form an electrical circuit. The solenoid valve is used to control the channel pipe between the compressed air source and the telescopic cylinder, and the control switch is located in the driver's area of ​​the dump truck.

[0006] In one feasible implementation, the rear protective device for dump trucks further includes a rear bumper fixedly connected to the protective plate, and the rear bumper is fixedly connected to the swing plate.

[0007] In one feasible implementation, the portion of the fixed plate that is hinged to the second hinge axis is provided with a first reinforcing rib, and the portion of the swing plate that is hinged to the first hinge axis is provided with a second reinforcing rib.

[0008] In one feasible implementation, the fixing plate is provided with an arc-shaped elongated hole for adjusting its own position.

[0009] In one possible implementation, the drive components are at least two arranged at intervals along the length of the rear bumper.

[0010] In one feasible implementation, the two telescopic cylinders in the two drive assemblies are respectively located on the corresponding inner sides of the two fixed plates, and the two telescopic cylinders in the two drive assemblies extend and retract synchronously.

[0011] Compared with existing technologies, the advantages of the rear protective device for dump trucks provided by this utility model are as follows: Firstly, the protective plate in the above structure can be folded up and installed at the bottom of the vehicle frame. In conjunction with the telescopic cylinder, fixed plate, swing plate, and first, second, and third hinge shafts of the drive assembly, the protective plate works in tandem (detailed coordination process: when the telescopic cylinder extends or retracts, its power output end pushes the middle of the swing plate through the third hinge shaft, causing the swing plate to rotate around the first hinge shaft. Since the other end of the swing plate is fixedly connected to the protective plate, it drives the protective plate to smoothly fold from the second state (under-protection) to the first state (raised and retracted) or vice versa; at the same time, all hinge shafts are parallel to the length direction of the protective plate to ensure consistent torque transmission and avoid jamming). This achieves automatic upward and downward control of the protective plate, making it easy to connect with the paver when in the retracted state and meeting the vehicle's road safety regulations when in the protected state. This helps to solve the technical problems of traditional manual protective devices being cumbersome to operate, inefficient, and unable to simultaneously achieve operational flexibility and road safety.

[0012] Another objective of this utility model is to provide a dump truck for paving operations, including the rear protective device for dump trucks mentioned above.

[0013] Compared to existing technologies, the dump truck for paving operations in this utility model possesses all the advantages of the aforementioned rear protective devices for dump trucks, which will not be elaborated upon here. Furthermore, the protective device is installed at the bottom of the vehicle frame, and its drive assembly is fixedly connected to the frame. During paving operations, the protective plate is automatically flipped up (retracted state) by a telescopic cylinder, facilitating docking with the paver for unloading. When operating on the road, the protective plate retracts to the protective state, meeting regulatory height requirements. The entire system is coordinated and controlled by the vehicle system, enabling automatic switching between operating and road modes for the dump truck. This achieves the technical effect of improving urban construction efficiency (such as paving coordination) and road safety, thus helping to solve the technical problem that traditional dump truck rear protective devices cannot simultaneously achieve efficient operation and compliant operation, affecting the progress and safety of urban infrastructure construction. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 A schematic diagram of the overall rear protective device for dump trucks provided by this utility model; Figure 2 A schematic diagram of the drive assembly of the rear protection device for dump trucks provided by this utility model in the first state; Figure 3 A schematic diagram of the drive assembly of the rear protection device for dump trucks provided by this utility model in the second state; Figure 4 A schematic diagram showing the connection relationship between the solenoid valve and the telescopic cylinder of the rear protection device for dump trucks provided by this utility model.

[0015] In the picture: 1. Protective panel; 2. Drive assembly; 21. Telescopic cylinder; 22. Fixed plate; 23. Swing plate; 24. Solenoid valve; 25. Control switch. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] In the description of this utility model, it should be noted that if terms such as "upper", "lower", "inner", "back" or indicating orientation or positional relationship appear, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0019] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] Please refer to the following: Figures 1 to 4 The rear protective device for dump trucks provided by this utility model will now be described. The rear protective device for dump trucks includes a protective plate 1 and a drive assembly 2. The protective plate 1 is foldable and located at the bottom of the dump truck's frame. The protective plate 1 has a first state and a second state. In the first state, the protective plate 1 is raised to form a retracted state, and in the second state, the protective plate 1 is lowered to form a protective state. The drive assembly 2 includes a telescopic cylinder 21, a fixed plate 22, a swing plate 23, a first hinge shaft, a second hinge shaft, and a third hinge shaft. The fixed plate 22 is located on the dump truck's frame. One end of the swing plate 23 is hinged to the fixed plate 22 via the first hinge shaft, and the other end is fixedly connected to the protective plate 1. The cylinder body of the telescopic cylinder 21 is hinged to the fixed plate 22 via the second hinge shaft, and the power output end of the telescopic cylinder 21 is hinged to the middle of the swing plate 23 via the third hinge shaft. The first, second, and third hinge shafts are all parallel to the length direction of the protective plate 1. As the telescopic cylinder 21 extends and retracts, the swing plate 23 drives the protective plate 1 to switch between the first and second states.

[0021] Compared to existing technologies, in this embodiment, during specific implementation, firstly, the protective plate 1 in the above structure can be folded down and installed at the bottom of the vehicle frame. This works in conjunction with the telescopic cylinder 21, fixed plate 22, swing plate 23, and the first, second, and third hinge shafts of the drive assembly 2 (detailed coordination process: when the telescopic cylinder 21 extends or retracts, its power output end pushes the middle of the swing plate 23 through the third hinge shaft, causing the swing plate 23 to rotate around the first hinge shaft. Since the other end of the swing plate 23 is fixedly connected to the protective plate 1, it drives the protective plate 1 to smoothly fold from the second state (lower protection) to the first state (lifted and retracted) or vice versa; simultaneously, all hinge shafts are parallel to the protective plate 1, ensuring consistent torque transmission and avoiding jamming). This achieves automatic upward and downward control of the protective plate 1, achieving the technical effect of facilitating docking with the paver in the retracted state and meeting vehicle road safety regulations in the protected state. This helps solve the technical problems of traditional manual protective devices being cumbersome to operate, inefficient, and unable to simultaneously balance operational flexibility and road safety.

[0022] In a preferred embodiment, the telescopic cylinder 21 is a pneumatic cylinder, and the drive assembly 2 also includes a solenoid valve 24 and a control switch 25. The control switch 25, the solenoid valve 24 and the frame of the dump truck form an electrical circuit. The solenoid valve 24 is used to control the channel pipe between the compressed air source and the telescopic cylinder 21, and the control switch 25 is located in the driver's area of ​​the dump truck. By configuring the telescopic cylinder 21 as a pneumatic cylinder, and cooperating with the solenoid valve 24 and control switch 25 added to the drive assembly 2 (the specific cooperation process is as follows: the operator operates the control switch 25 in the driving area to trigger the electrical circuit (composed of control switch 25, solenoid valve 24 and frame), the solenoid valve 24 responds and adjusts the opening and closing of the channel pipe between the compressed air source and the telescopic cylinder 21, thereby precisely controlling the extension and retraction stroke of the cylinder; the pneumatic system responds quickly, and drives the swing plate 23 to move through the extension and retraction of the telescopic cylinder 21, indirectly driving the protective plate 1 to switch between two states), remote electric control of the protective plate 1 is realized, achieving the technical effects of simple operation, rapid response and reduced human intervention, and solving the technical problems of low efficiency and poor safety of manual operation in complex working environments, and the inability to achieve one-button control in the cab.

[0023] Based on the above embodiments, in a preferred embodiment, the rear protective device for dump trucks further includes a rear bumper fixedly connected to the protective plate 1, and the rear bumper is fixedly connected to the swing plate 23. With this configuration, this embodiment can achieve an integrated structure by adding a rear bumper fixedly connected to the protective plate 1, thus ensuring that the rear bumper, the protective plate 1, and the swing plate 23 are all fixedly connected. When the swing plate 23 is driven to rotate by the telescopic cylinder 21, the rear bumper, as a rigid connecting member, evenly transmits the driving force to the protective plate 1, enhancing overall rigidity. Simultaneously, the rear bumper provides an additional support surface in the protective state, achieving overall reinforcement and force distribution optimization of the protective device. This improves the stability and impact resistance of the protective plate 1 during the folding process, effectively addressing the technical problem of a single protective plate 1 being prone to deformation or loosening, leading to protective failure or shortened service life.

[0024] In a preferred embodiment, the fixed plate 22 is provided with a first reinforcing rib at the location where it is hinged to the second hinge axis, and the swing plate 23 is provided with a second reinforcing rib at the location where it is hinged to the first hinge axis. In this way, by providing a first reinforcing rib at the location where the fixed plate 22 is hinged to the second hinge axis and a second reinforcing rib at the location where the swing plate 23 is hinged to the first hinge axis, when the telescopic cylinder 21 applies thrust, the first reinforcing rib strengthens the fixed plate 22 to withstand the reaction force of the second hinge axis, while the second reinforcing rib enhances the torsional strength of the swing plate 23 at the first hinge axis, dispersing stress concentration. This ensures that the hinge axis is not easily deformed during frequent folding, locally strengthens key hinge points, extends the life of the drive assembly 2, reduces the failure rate, and solves the technical problem that the hinge parts are prone to wear or breakage under high loads, affecting the reliability of the protective device.

[0025] As a preferred embodiment, the fixing plate 22 is provided with an arc-shaped elongated hole for adjusting its own position, allowing the fixing plate 22 to be finely adjusted on the frame by bolts. When adjusting, the bolts are loosened, the fixing plate 22 is slid along the arc trajectory to change its angle, and then tightened again. This optimizes the initial engagement angle between the telescopic cylinder 21 and the swing plate 23, ensuring smooth folding action.

[0026] In a preferred embodiment, at least two drive components 2 are arranged at intervals along the length of the rear bumper. Multiple drive components 2 are installed in parallel, with each component's telescopic cylinder 21 independently driving its swing plate 23, but working together through the rigid connection of the rear bumper. When all telescopic cylinders 21 extend and retract synchronously, the force is evenly distributed across the entire length of the protective plate 1, avoiding excessive local stress. Furthermore, the multi-point distributed drive also achieves a smoother, non-twisting folding process for the protective plate 1, effectively solving the technical problem of insufficient or uneven force from a single drive component 2 on the long protective plate 1, leading to folding jamming or deformation.

[0027] In a preferred embodiment, the two telescopic cylinders 21 in the two drive assemblies 2 are respectively located on the corresponding inner sides of the two fixed plates 22, and the two telescopic cylinders 21 in the two drive assemblies 2 extend and retract synchronously. The telescopic cylinders 21 are built into the inner side of the fixed plates 22, which can reduce external interference; the two telescopic cylinders 21 extend and retract simultaneously through mechanical linkage or electronic control system such as the solenoid valve 24 mentioned above, so as to push their respective swing plates 23 to move at the same speed and angle; combined with the fixed connection of the rear bumper, the force transmission is consistent, and the driving force is precisely synchronized, so as to achieve the technical effect of high consistency and no deviation of the protective plate 1 during state switching.

[0028] In summary, the rear protective device for dump trucks provided by this utility model, through the coordinated operation of the protective plate 1 and the drive assembly 2 in the above-mentioned structure, when the telescopic cylinder 21 extends or retracts, its power output end pushes the middle of the swing plate 23 via the third hinge shaft, causing the swing plate 23 to rotate around the first hinge shaft as the fulcrum, thereby driving the protective plate 1, which is fixed to the swing plate 23, to automatically switch between the retracted state and the protective state. Combined with the pneumatic system (solenoid valve 24 remotely controls the telescopic cylinder 21), reinforced connection points (hinge point reinforcing ribs), adjustable mechanism (arc-shaped elongated hole), and multi-point synchronous drive (at least two sets of components are distributed along the rear bumper and the telescopic cylinder 21 operates synchronously), the automatic folding control of the protective plate 1 is achieved quickly, stably, and with high reliability. The technical effect of seamless switching between dual modes is achieved: specifically, in the protective state: the protective plate 1 is lowered to the legal height to ensure the safety of vehicle driving on the road; in the retracted state: space is created on the protective plate 1 to facilitate efficient docking and unloading with the paver. This addresses the core technical issues of traditional dump truck rear protection devices, which cannot balance road safety compliance with construction flexibility, rely on manual operation, and are prone to failure, thus significantly improving the efficiency and safety of urban infrastructure construction.

[0029] Based on the same inventive concept, this utility model also proposes a road paving dump truck, which includes the rear protective device for dump trucks mentioned above.

[0030] Compared to existing technologies, in this embodiment, the protective device in the dump truck used for paving operations is installed at the bottom of the vehicle frame, and its drive component 2 is fixedly connected to the vehicle frame. During paving operations, the protective plate 1 is automatically flipped up (retracted state) by the telescopic cylinder 21, facilitating docking and unloading with the paver. When operating on the road, the protective plate 1 falls back to the protective state, meeting the regulatory height requirements. The entire system is coordinated and controlled by the vehicle system, realizing the automatic switching between the dump truck's operation and road modes. This achieves the technical effect of improving urban construction efficiency (such as paving coordination) and road safety, solving the technical problem that traditional dump truck rear protective devices cannot simultaneously achieve efficient operation and compliant operation, affecting the progress and safety of urban infrastructure construction.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rear protective device for dump trucks, characterized in that, include: The protective plate (1) is foldable and located at the bottom of the frame of the dump truck. The protective plate (1) has a first state and a second state. In the first state, the protective plate (1) is raised to form a retracted state. In the second state, the protective plate (1) is lowered to form a protective state. The drive assembly (2) includes a telescopic cylinder (21), a fixed plate (22), a swing plate (23), a first hinge shaft, a second hinge shaft, and a third hinge shaft. The fixed plate (22) is mounted on the frame of the dump truck. One end of the swing plate (23) is hinged to the fixed plate (22) via the first hinge shaft, and the other end is fixedly connected to the protective plate (1). The cylinder body of the telescopic cylinder (21) is hinged to the fixed plate (22) via the second hinge shaft. The power output end of the telescopic cylinder (21) is hinged to the middle of the swing plate (23) via the third hinge shaft. The first hinge shaft, the second hinge shaft, and the third hinge shaft are all parallel to the length direction of the protective plate (1). As the telescopic cylinder (21) extends and retracts, the swing plate (23) drives the protective plate (1) to switch between the first state and the second state.

2. The rear protective device for dump trucks as described in claim 1, characterized in that, The telescopic cylinder (21) is a cylinder. The drive assembly (2) also includes a solenoid valve (24) and a control switch (25). The control switch (25), the solenoid valve (24) and the chassis of the dump truck form an electrical circuit. The solenoid valve (24) is used to control the channel pipe between the compressed air source and the telescopic cylinder (21). The control switch (25) is located in the driving area of ​​the dump truck.

3. The rear protective device for dump trucks as described in claim 1, characterized in that, The rear protective device for dump trucks also includes a rear bumper fixedly connected to the protective plate (1), and the rear bumper is fixedly connected to the swing plate (23).

4. The rear protective device for dump trucks as described in claim 3, characterized in that, The fixed plate (22) is provided with a first reinforcing rib at the part where the second hinge shaft is hinged, and the swing plate (23) is provided with a second reinforcing rib at the part where the first hinge shaft is hinged.

5. The rear protective device for dump trucks as described in claim 4, characterized in that, The fixing plate (22) is provided with an arc-shaped elongated hole for adjusting its own position.

6. The rear protective device for dump trucks as described in claim 3, characterized in that, The drive assembly (2) consists of at least two units spaced apart along the length of the rear bumper.

7. The rear protective device for dump trucks as described in claim 6, characterized in that, The two telescopic cylinders (21) in the two drive assemblies (2) are respectively located on the corresponding inner sides of the two fixed plates (22), and the two telescopic cylinders (21) in the two drive assemblies (2) extend and retract synchronously.

8. A dump truck for road paving operations, characterized in that, Includes the rear protective device for dump trucks as described in any one of claims 1 to 7.

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