A self-unloading vehicle box body rear door limiting device

Abstract

The utility model belongs to the technical field of dump truck, concretely relates to a dump truck box body rear door limiting device, including auxiliary frame and the dump box body of being located at the top of auxiliary frame, the rear end of dump box body is equipped with the box door of open -and -close, still include: axle seat, base, turnover arm, connecting seat, support seat, drive cylinder and top pressure part, the utility model discloses the ejection and retraction of turnover arm, effectively prevented the safety risk of accidental opening of the rear end box door of dump box body after unlocking because of goods impact, realized the separation of unlocking operation and box door opening, make the operating personnel can open the lock rod under the protection of spacing, then after evacuating to the safe area, remote control turnover arm to retract, in this way, the safety of operating personnel is guaranteed, personal injury and equipment impact risk are avoided, and simple structure, reliable operation satisfy the safety demand of unloading process.

Description

Technical Field

[0001] This utility model belongs to the field of dump truck technology and relates to a rear door limiting device for a dump truck body. Background Technology

[0002] Dump trucks are efficient and convenient bulk cargo transport vehicles, widely used for road transport of goods such as coal, sand, gravel, and minerals. Among them, dump trucks with a double-door box structure have become the common mainstream structural form due to their advantages such as large open area, smooth unloading, and easy loading.

[0003] When unloading this type of container, operators must manually release the locking lever at the rear of the container before the vehicle can lift the container for unloading. However, because bulk cargo such as sand, gravel, and coal loaded inside the container often lies in a state of natural accumulation during transportation, the moment the locking lever is opened, the cargo inside impacts the rear door under its own weight, causing the rear door to be instantly forced open. Operators near the rear door at this time are highly likely to be unable to avoid being hit by the rapidly opening rear door or buried by the spilled cargo, resulting in serious personal injury or even death. Utility Model Content

[0004] The purpose of this utility model is to provide a limiting device for the rear door of a dump truck body, which solves the technical problem that in the prior art, due to the lack of a limiting device for the rear door of the body, the door will instantly pop open when impacted by the cargo after the locking bar is opened, thus threatening the safety of the operator.

[0005] This utility model discloses a rear door limiting device for a dump truck body, including a subframe and a dump truck body disposed on top of the subframe. The rear end of the dump truck body is provided with an openable and closable door, and further includes: Axle seat is located at the rear end of the subframe; The base is located at the bottom of the subframe; The tilting arm is vertically arranged and located behind the subframe: A connecting seat is located at the bottom end of the tilting arm and is hinged to the shaft seat; A support base is provided at the bottom end of the tilting arm and located below the connecting base; The drive cylinder is hinged at one end to the base and at the other end to the support seat; The top pressing part is located at the top of the flipping arm and on the side facing the box door.

[0006] This application effectively prevents the safety risk of the rear door of the self-unloading container being accidentally opened due to cargo impact after unlocking by extending and retracting the tilting arm. It separates the unlocking operation from the door opening, allowing the operator to open the locking bar under limit protection and then remotely control the tilting arm to retract after retreating to a safe area. This ensures the safety of the operator, avoids personal injury and equipment impact risks, and has a simple structure, reliable operation, and meets the safety requirements of the unloading process.

[0007] Based on the above technical solution, the solution of this application can be further improved as follows: Preferably, the top pressing portion includes: Top pressure plate; The connecting pipe is connected at both ends to the top pressure plate and the tilting arm, respectively. A reinforcing plate is vertically installed on the side of the connecting pipe near the support base, and its two ends are connected to the top pressure plate and the flip arm, respectively. This solution achieves stable contact with the door and efficient transmission of thrust, while ensuring the overall bending stiffness and strength. It also improves the structural reliability of the device under long-term, heavy-load conditions, ensuring the reliability and durability of the device.

[0008] Preferably, the top pressing part further includes: A flexible pad is placed on the side of the top pressure plate away from the connecting pipe. This solution provides buffer protection and increases friction, thus protecting the outer surface of the door and ensuring stable anti-slip operation under pressure. It also reduces impact noise and improves durability and smoothness of use.

[0009] Preferably, the top pressure plate has folded edges on both sides extending toward the flipping arm; this design enhances the structural rigidity of the top pressure plate, effectively prevents deformation when subjected to impact, and improves the stability and durability of the structure.

[0010] Preferably, the flipping arm includes: The web of the I-beam is parallel to the swing plane of the tilting arm; Two side plates are respectively located on both sides of the I-beam in the web thickness direction, and the lateral openings on the corresponding sides of the I-beam are closed. This solution improves the bending and torsional stiffness, significantly enhances the overall stability and load-bearing reliability of the tilting arm, and achieves lightweight and durability of the structure.

[0011] Preferably, the connector includes: Two connecting plates are fixedly attached to the opposite outer surfaces of the two side plates, and each connecting plate has an extension extending toward the subframe. The bushings have two ends that pass through and are fixed to the extensions of the two connecting plates, respectively. Two bearings are coaxially fitted at both ends of the bushing; The bearing includes: Two upright panels are arranged at intervals relative to each other; A support shaft is inserted between the two upright plates; In this design, the extensions of the two connecting plates extend into the space between the upright plates, the support shaft passes through the bushing and forms a rotational fit with the inner rings of the two bearings; this design significantly enhances the load-bearing capacity and stability at the connection between the tilting arm and the subframe, ensures the flexibility of the tilting arm's swing, and reduces frictional resistance, thereby improving the reliability and durability of the device.

[0012] Preferably, the support base includes: Two support plates are arranged at a distance from each other, and a connection hole is provided at the end away from the flip arm; An intermediate plate is fixedly connected between the two support plates and is perpendicular to the support plates; In this design, two slots are symmetrically opened on both sides of the web at the bottom end of the I-beam. The two support plates are respectively inserted and fixed into the two slots at the ends near the tilting arm. This design forms a stable three-dimensional frame and is fixed to the I-beam by inserting the slots, which greatly enhances the connection strength and rigidity between the support base and the tilting arm. It effectively distributes the concentrated load to the entire cross-section of the I-beam, improves the structural reliability of the connection, and avoids local stress concentration.

[0013] Through the above technical solution, this utility model achieves the following beneficial effects: 1. This application effectively prevents the safety risk of the rear door of the self-unloading container being accidentally opened due to cargo impact after unlocking by pushing out and retracting the tilting arm. It separates the unlocking operation from the door opening, allowing the operator to open the locking bar under limit protection, and then remotely control the tilting arm to retract after retreating to a safe area. This ensures the safety of the operator, avoids personal injury and equipment impact risks, and has a simple structure, reliable operation, and meets the safety requirements of the unloading process. 2. This application achieves stable contact with the box door and efficient transmission of thrust through the top pressure plate, connecting pipe and reinforcing plate, and ensures the overall bending stiffness and strength, improves the structural reliability of the device under long-term heavy load conditions, and ensures the reliability and durability of the device. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a front view of the dump truck body rear door limiting device in the retracted state as described in the embodiment; Figure 2 This is a front view of the dump truck body rear door limiting device in the ejected state as described in the embodiment; Figure 3 for Figure 2 A front view of a portion of the structure in the rear door limiting device of the dump truck body shown; Figure 4 for Figure 3 Enlarged view of section AA; Figure 5 for Figure 3 Side view of the partial structure; Figure 6 for Figure 2 Assembly diagram of the central bearing and connecting seat; Figure 7 for Figure 2 Front sectional view of the middle support base; Figure 8 for Figure 4 Front view of the I-beam; Figure 9 for Figure 4 Side view of the I-beam; Explanation of reference numerals in the attached figures: 1. Subframe; 2. Self-unloading container body; 21. Container door; 3. Shaft seat; 31. Vertical plate; 32. Support shaft; 4. Base; 5. Tilting arm; 51. I-beam; 511. Slot; 52. Side plate; 6. Connecting seat; 61. Connecting plate; 611. Extension; 62. Bushing; 63. Bearing; 7. Support base; 71. Support plate; 711. Connecting hole; 72. Intermediate plate; 8. Drive cylinder; 9. Top pressure section; 91. Top pressure plate; 911. Folded edge; 92. Connecting pipe; 93. Reinforcing plate; 94. Flexible pad. Detailed Implementation

[0016] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0017] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0019] Example: like Figure 1 and Figure 2 As shown in the figure, this application discloses a rear door limiting device for a dump truck body, which is used to limit the door after the door lock bar is opened and before the body is lifted to prevent it from accidentally popping open due to the instantaneous pressure impact of the internal cargo. Specifically, it includes a subframe 1 and a dump truck body 2 located on top of the subframe 1; the subframe 1 is the load-bearing chassis frame of the whole vehicle, providing a stable installation base; the dump truck body 2 is used to load cargo, and its rear end is provided with an openable and closable door 21, and also includes: axle seat 3, base 4, tilting arm 5, connecting seat 6, support seat 7, drive cylinder 8 and top pressing part 9.

[0020] The axle seat 3 is located at the rear end of the subframe 1 and serves as the rotation fulcrum of the tilting arm 5, allowing the tilting arm 5 to rotate around this axis.

[0021] The base 4 is located at the bottom of the subframe 1 and is used to provide a firm hinge point for the cylinder end of the drive cylinder 8 and to withstand the reaction force generated when the drive cylinder 8 is pushed or pulled.

[0022] The tilting arm 5 is arranged vertically and located behind the subframe 1. Its bottom end receives the thrust of the drive cylinder 8, thereby rotating around the axle seat 3 to transmit power to the top pressing part 9 and send it to the limit position.

[0023] The connecting seat 6 is located at the bottom of the tilting arm 5 and is hinged to the shaft seat 3, forming the rotation axis of the tilting arm 5, ensuring a stable connection.

[0024] The support base 7 is located at the bottom end of the tilting arm 5 and below the connecting base 6, providing a stable hinge fulcrum for the piston rod end of the drive cylinder 8.

[0025] One end of the drive cylinder 8 is hinged to the base 4, and the other end is hinged to the support 7. It is used to directly control the lifting (pushing out) and lowering (retracting) of the tilting arm 5 through telescopic movement, thereby realizing the automation and remote operation of the device.

[0026] The pressing part 9 is located at the top of the tilting arm 5 and on the side facing the door 21. It is used to press tightly against the outer surface of the door 21 to form a reliable stop and counteract the outward impact force of the goods.

[0027] The workflow of the above technical solution is as follows: When the vehicle is in normal operation: the drive cylinder 8 is in the extended state, pushing the tilting arm 5 to stand up, so that the top pressing part 9 installed at the top of the tilting arm 5 firmly abuts against the outer surface of the rear door 21 of the dump box 2.

[0028] Unloading a fully loaded vehicle: The operator manually opens the locking lever of the rear door 21 of the self-unloading container 2. Although the locking lever is released, the top pressure part 9 of the device still firmly holds the door 21 closed under the impact of the cargo's weight, thus preventing the operator from being hit by the suddenly opened door or buried by the cargo. Afterwards, the operator moves away from the door 21 and, upon reaching a safe position, operates the power unit to quickly retract the drive cylinder 8 to the end of its stroke. The retraction of the drive cylinder 8 drives the tilting arm 5 to rotate downwards and retract, causing the top pressure part 9 to descend, eventually falling below the level of the unloading platform to avoid the opening path of the door 21. Simultaneously, the cargo at the top of the container forces the door 21 open, but because the device has retracted in advance, the door 21 avoids impacting the device. Finally, the operator controls the lifting cylinder of the self-unloading truck to tilt and lift the self-unloading container 2 backwards, completing the unloading of the cargo.

[0029] After unloading, the dump truck is restored to its original state by controlling the lifting cylinder to return the dump box 2 to a horizontal position. The operator then manually closes the door 21 and locks the locking lever. Afterward, the operator manipulates the power unit again to extend the drive cylinder 8, which pushes the tilting arm 5 to rotate upward and push it out, so that the top pressing part 9 firmly presses against the door 21 again, restoring the first stage of double locking state and ensuring that the door 21 cannot be opened during subsequent driving or waiting.

[0030] This utility model effectively prevents the safety risk of the rear door 21 of the self-unloading container 2 being accidentally opened due to the impact of the goods after unlocking by pushing out and retracting the tilting arm 5. It realizes the separation of the unlocking operation and the opening of the door 21, allowing the operator to open the locking bar under the limit protection, and then remotely control the tilting arm 5 to retract after retreating to a safe area. This ensures the safety of the operator, avoids the risk of personal injury and equipment collision, and has a simple structure, reliable operation, and meets the safety requirements of the unloading process.

[0031] In some embodiments, such as Figure 3 As shown, the top pressure part 9 includes: Top pressure plate 91 is used to provide a flat and stable bearing surface to ensure uniform stress distribution; The connecting pipe 92 is connected to the top pressure plate 91 and the tilting arm 5 at both ends, respectively, and plays the role of thrust transmission. Moreover, the tubular structure ensures structural strength while achieving lightweight. The reinforcing plate 93 is vertically installed on the side of the connecting pipe 92 near the support base 7, and its two ends are connected to the top pressure plate 91 and the tilting arm 5 respectively. It is used to increase the bending stiffness and strength, and ensure the structural reliability of the device under long-term and heavy-load conditions.

[0032] Through the above design, stable contact with the door 21 and efficient transmission of thrust are achieved, and the overall bending stiffness and strength are guaranteed, which improves the structural reliability of the device under long-term and heavy-load conditions and ensures the reliability and durability of the device.

[0033] Based on the above embodiments, such as Figure 3 As shown, the top pressure section 9 also includes: The flexible pad 94 covers the side of the top pressure plate 91 away from the connecting pipe 92. It can be a rubber plate or other materials, and can be installed and fixed by multiple countersunk bolts. No specific limitation is made.

[0034] The above design provides buffer protection and increases friction, thus protecting the outer surface of the door 21 and ensuring stable anti-slip under pressure. It also reduces impact noise and improves durability and smoothness of use.

[0035] Based on the above embodiments, such as Figure 5 As shown, the top pressure plate 91 has folded edges 911 on both sides extending toward the flip arm 5.

[0036] The above design enhances the structural rigidity of the top pressure plate 91, effectively preventing it from deforming under impact and improving the stability and durability of the structure.

[0037] In some embodiments, such as Figure 4 and Figure 5 As shown, the tilting arm 5 includes: The I-beam 51 has an I-shaped section with excellent bending resistance, and its web is parallel to the swing plane of the tilting arm 5, thus most effectively resisting the main bending load borne by the tilting arm 5. Two side plates 52 are respectively located on both sides of the I-beam 51 in the web thickness direction and close the lateral openings on the corresponding sides of the I-beam 51 to form a H-shaped cross section, which improves the torsional stiffness and structural strength, and also provides a flat mounting surface for the connecting seat 6, improving the connection stability.

[0038] The above design significantly improves bending and torsional stiffness, greatly enhances the overall stability and load-bearing reliability of the tilting arm 5, and achieves lightweight and durable structure.

[0039] Based on the above embodiments, such as Figures 3 to 6 As shown, the connector 6 includes: Two connecting plates 61 are fixedly attached to the opposite outer sides of two side plates 52, which can be welded to increase the contact area and ensure a firm connection. Each connecting plate 61 has an extension 611 extending towards the subframe 1 for docking with the axle seat 3. The bushing 62 has its two ends passing through and fixed to the extensions 611 of the two connecting plates 61 to form an integral frame, thereby enhancing the structural strength. Two bearings 63 are coaxially mounted at both ends of the bushing 62. Their inner rings serve as rotational support surfaces to reduce frictional resistance, make rotation smoother, and improve durability.

[0040] In this embodiment, as Figure 6 As shown, the bearing 3 includes: Two upright plates 31 are arranged at intervals to support both ends; The support shaft 32 is inserted between the two vertical plates 31 and serves as a fixed axis of rotation.

[0041] Among them, such as Figure 6 As shown, the extensions 611 of the two connecting plates 61 extend into the space between the vertical plates 31, which serves as an axial limit. The support shaft 32 passes through the bushing 62 and forms a rotational fit with the inner rings of the two bearings 63.

[0042] The above design significantly enhances the load-bearing capacity and stability at the connection between the tilting arm 5 and the subframe 1, ensures the flexibility of the tilting arm 5's swing, and reduces frictional resistance, thereby improving the device's operational reliability and durability.

[0043] In some embodiments, such as Figures 3 to 9 As shown, the support base 7 includes: Two support plates 71 are arranged at intervals to bear the force transmitted by the drive cylinder 8. The support at both ends reduces stress concentration and improves structural strength. The end away from the tilting arm 5 is provided with a connecting hole 711 for hinge connection with the piston rod end of the drive cylinder 8. The intermediate plate 72 is fixedly connected between the two support plates 71 and is perpendicular to the support plates 71. It is used to connect the two parallel support plates 71 into a whole, thereby improving the structural stability of the support plates 71, enhancing the load-bearing capacity, and distributing the load evenly.

[0044] The bottom end of the I-beam 51 has two symmetrical slots 511 on both sides of its web. The two support plates 71 are inserted into and fixed in the two slots 511 at the ends near the flip arm 5. This allows the support plates 71 to evenly transfer the force to the two flanges of the I-beam 51, thereby significantly reducing stress concentration at the connection, improving load-bearing capacity and structural reliability, and providing a positioning reference for the installation of the support plates 71, ensuring assembly accuracy and force symmetry.

[0045] Through the above design, a stable three-dimensional frame is formed, and it is fixed by insertion with the I-beam 51 through the slot 511. This greatly enhances the connection strength and rigidity between the support base 7 and the tilting arm 5, effectively distributing the concentrated load of the drive cylinder 8 to the entire cross section of the I-beam 51, improving the structural reliability of the connection, and avoiding local stress concentration.

[0046] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A rear door limiting device for a dump truck body, comprising a subframe and a dump truck body disposed on top of the subframe, wherein the rear end of the dump truck body is provided with an openable and closable door, characterized in that, Also includes: Axle seat is located at the rear end of the subframe; The base is located at the bottom of the subframe; The tilting arm is vertically arranged and located behind the subframe: A connecting seat is located at the bottom end of the tilting arm and is hinged to the shaft seat; A support base is provided at the bottom end of the tilting arm and located below the connecting base; The drive cylinder is hinged at one end to the base and at the other end to the support seat; The top pressing part is located at the top of the flipping arm and on the side facing the box door.

2. The dump truck body rear door limiting device according to claim 1, characterized in that, The top pressure section includes: Top pressure plate; The connecting pipe is connected at both ends to the top pressure plate and the tilting arm, respectively. A reinforcing plate is vertically installed on the side of the connecting pipe near the support base, and its two ends are respectively connected to the top pressure plate and the flipping arm.

3. The dump truck body rear door limiting device according to claim 2, characterized in that, The top pressure section also includes: A flexible pad is placed on the side of the top pressure plate away from the connecting pipe.

4. The rear door limiting device for a dump truck body according to claim 2, characterized in that, The top pressure plate has folded edges on both sides that extend toward the direction of the flipping arm.

5. The dump truck body rear door limiting device according to claim 1, characterized in that, The tilting arm includes: The web of the I-beam is parallel to the swing plane of the tilting arm; Two side plates are respectively disposed on both sides of the I-beam in the web thickness direction, and close the lateral openings on the corresponding sides of the I-beam.

6. The dump truck body rear door limiting device according to claim 5, characterized in that, The connector includes: Two connecting plates are fixedly attached to the opposite outer surfaces of the two side plates, and each connecting plate has an extension extending toward the subframe. The bushings have two ends that pass through and are fixed to the extensions of the two connecting plates, respectively. Two bearings are coaxially fitted at both ends of the bushing; The bearing includes: Two upright panels are arranged at intervals relative to each other; A support shaft is inserted between the two upright plates; The extensions of the two connecting plates extend between the upright plates, and the support shaft passes through the bushing and forms a rotational engagement with the inner rings of the two bearings.

7. The dump truck body rear door limiting device according to claim 5, characterized in that, The support base includes: Two support plates are arranged at a distance from each other, and a connection hole is provided at the end away from the flip arm; An intermediate plate is fixedly connected between the two support plates and is perpendicular to the support plates; The bottom end of the I-beam has two symmetrical slots on both sides of its web, and the two support plates near the end of the flip arm are respectively inserted into and fixed in the two slots.

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