Telescopic leg overlapping structure and concrete pump truck having the same

Abstract

The present invention belongs to the field of engineering machinery and relates to a telescopic leg lap joint structure and a concrete pump truck having the same. The telescopic leg lap joint structure includes a leg and a chassis lap joint area, the chassis lap joint area includes a chassis box and a chassis lap joint plate, the chassis box includes chassis side plates, a chassis bottom plate, and a chassis door plate; the leg includes a leg box, a leg lap joint plate, and a lap joint block; the leg box includes a leg cover plate, a leg bottom plate, and a leg side plate; the leg end is provided with a leg lap joint plate, and the leg side plate is symmetrically provided with lap joint blocks. The technical solution of the present invention can improve the strength and rigidity of the lap joint area, while increasing the lap joint of the leg side, so that the entire lap joint area is provided with lap joint groups in the four directions of up, down, left, and right, ensuring the structural stability of the leg when it bears complex loads during support work of the pump truck.

Description

Technical Field

[0001] The invention belongs to the field of engineering machinery, and in particular relates to a telescopic leg overlapping structure and a concrete pump truck having the structure. Background Art

[0002] A concrete pump truck is a type of construction machinery that uses pressure to transport pre-mixed concrete along pipelines to a certain height and distance. It is widely used in modern construction projects. The main load-bearing components of a concrete pump truck are the outriggers and chassis. The outriggers can be deployed in two types: telescopic and swinging. Telescopic outriggers have become the mainstream type in the market due to their smaller deployment space and greater site adaptability.

[0003] To ensure safety during operation, the outrigger tips of concrete pump trucks overlap with the chassis at some point after they are extended. This area is the overlapped joint, a critical stress-bearing area between the chassis and outrigger structures. It's also a common location for undercarriage structural failure, prone to tearing of the chassis box floor, damage to the outrigger covers, and other issues. Pump trucks must maintain a horizontal support surface. Under the vertical upward reaction force, the outrigger tips overlap with the chassis box, and the outrigger covers overlap with the chassis door panels. These two areas overlap, and are typically reinforced during design. In some actual working conditions, the support surface of the outrigger cannot be guaranteed to be horizontal, and there will be a small angle of inclination. At this time, the outrigger will overlap with the side panel of the chassis box when subjected to lateral force. At present, the chassis and outrigger structure have not been reinforced here. The outrigger cover plate and the bottom plate themselves have been treated with blunt edge grooves to avoid the welds in the chassis box. When the side is overlapped, it is equivalent to an edge with a thickness of only 3-5mm to contact and transmit force with the chassis door panel and chassis side plate, which can easily cause local damage to the cover plate and bottom plate, resulting in poor expansion and contraction of the outrigger structure and even damage to the box body, affecting product quality and service life. Summary of the Invention

[0004] The purpose of the present invention is to design a new type of overlapping structure of the telescopic legs of a concrete pump truck, improve the strength and rigidity of the overlapping area, and at the same time increase the side overlap of the legs, so that the entire overlapping area is provided with overlapping groups in the four directions of up, down, left and right, thereby ensuring the stability of the structure when the legs bear complex loads during the support work of the pump truck.

[0005] The technical solutions provided by the present invention are as follows:

[0006] A telescopic leg overlap structure includes a leg and a base frame overlap area,

[0007] The chassis overlap area includes a chassis box and a chassis overlap plate, and the chassis box includes a chassis side plate, a chassis bottom plate, and a chassis door plate; the front end of the support leg overlaps the inner side of the chassis door plate, and the end of the support leg overlaps the chassis overlap plate;

[0008] The support leg includes a support leg box, a support leg overlapping plate and a overlapping block; the support leg box includes a support leg cover plate, a support leg bottom plate, and a support leg side plate; a support leg overlapping plate is provided at the end of the support leg, and overlapping blocks are symmetrically provided on the support leg side plate, and the overlapping blocks are provided at the position where the support leg contacts the base frame door panel.

[0009] Furthermore, the leg lap plate is I-shaped.

[0010] Furthermore, the thickness of the leg lap plate is 20-40 mm.

[0011] Furthermore, a hole is opened in the middle of the leg lap plate.

[0012] Furthermore, the side of the leg lap plate is provided with protrusions, and there are four protrusions.

[0013] Furthermore, the overlapping blocks are welded to the side plates of the supporting legs, and the outer side surfaces of the overlapping blocks are aligned with the supporting leg bottom plates and the supporting leg cover plates.

[0014] Furthermore, the height of the chassis box is 3-5mm greater than the height of the leg box, a 2-3mm gap is left at the side of the chassis lap plate and the leg lap plate, and a 2-3mm gap is left at the side of the chassis door panel and the leg lap plate.

[0015] Furthermore, the chassis lap plate is U-shaped, and the chassis lap plate is connected to the chassis box body in an embedded manner.

[0016] Furthermore, the thickness of the chassis lap plate is the same as the thickness of the leg lap plate.

[0017] The present invention also provides a concrete pump truck having the above-mentioned telescopic leg overlapping structure.

[0018] Beneficial effects

[0019] This patent designs a new type of overlapping structure for the telescopic legs of concrete pump trucks. The end of the leg adopts an I-shaped thick plate and a U-shaped thick plate embedded in the chassis to form a high-rigidity overlapping group. At the overlapping point between the front end of the leg and the chassis door panel, overlapping blocks are set on both side plates of the leg to form an overlapping group with the chassis door panel. The front and rear overlapping areas can meet the requirements of upper and lower overlapping and side overlapping. When the outrigger is supporting normally, the I-shaped thick plate at the end of the outrigger contacts and transmits force with the U-shaped thick plate of the base, and the front end of the outrigger contacts and transmits force with the bottom frame door panel. The force transmission area is all in contact with high-rigidity thick plates, the overall deformation is small, and the structure is more stable. When the outrigger is tilted at a small angle, the outrigger is subjected to lateral force, and the side of the I-shaped thick plate at the overlap of the end of the outrigger contacts the inward extension of the U-shaped thick plate of the bottom frame, and the overlap block set on the side plate of the outrigger at the overlap of the front end of the outrigger contacts the side of the bottom frame door panel, which perfectly solves the side overlap problem. The entire overlap area is provided with overlap groups in the four directions of up, down, left and right, which ensures the structural stability of the outrigger when it bears complex loads when the pump truck supports work. The high-rigidity contact area effectively reduces the stress and deformation of the overlap part, thereby improving product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the structure of the leg joint;

[0021] Figure 2 It is the structure of the base frame joint;

[0022] Figure 3 Schematic diagram of the overlap between the legs and the base frame. DETAILED DESCRIPTION

[0023] Example 1

[0024] The basic scheme of the present invention is: the end of the support leg adopts an I-shaped thick plate and the embedded U-shaped thick plate of the base frame to form a high-rigidity overlap group, the front end of the support leg overlaps with the base frame door panel, and the two side plates of the support leg are provided with overlap blocks to form an overlap group with the base frame door panel. The front and rear overlap areas can meet the complex working conditions of upper and lower overlap and side overlap.

[0025] A telescopic leg overlap structure includes a leg and a base frame overlap area, such as Figure 1 As shown, the outrigger includes a outrigger box body, an outrigger lap plate 4 and an lap block 5; the outrigger box body includes an outrigger cover plate 1, an outrigger bottom plate 2, and an outrigger side plate 3; the outrigger side plates are provided with two pieces, which are fixed between the outrigger cover plate 1 and the outrigger bottom plate 2, and a outrigger lap plate 4 is provided at the end of the outrigger, the outrigger lap plate 4 is I-shaped, and the I-shaped lap plate is a thick plate structure. The thickness of the outrigger lap plate can be set to 20-40 mm according to the size of the support reaction force. The outrigger lap plate 4 has a hole in the middle for arranging driving components such as telescopic cylinders. The side of the outrigger lap plate 4 is provided with protrusions, and there are 4 protrusions for contacting and transmitting force with the corresponding positions of the chassis. The recessed parts between the side protrusions are used to arrange the hydraulic pipelines of the driving cylinders.

[0026] The leg side panels 3 are symmetrically provided with overlap blocks 5, which are welded to the leg side panels 3. The overlap blocks 5 are arranged at the position where the leg contacts the chassis door panel. The position is determined according to the length of the leg when extended, and the thickness of the overlap blocks is determined according to the length of the upper and lower cover plates extending out of the side panels, to ensure that the outer side surfaces of the overlap blocks 5 are aligned with the leg bottom panel 2 and the leg cover plate 1 after welding. When the leg is subjected to lateral force, the overlap blocks are in contact with the chassis door panel to transmit force, thereby avoiding direct contact between the sides of the bottom panel and the cover plate and the chassis door panel, causing local damage to the cover plate and the bottom panel.

[0027] like Figure 2 As shown, the chassis overlap area includes a chassis box and a chassis overlap plate 6, and the chassis box includes a chassis side plate 7, a chassis bottom plate 8, and a chassis door plate 9; the front end of the support leg is overlapped with the inner side of the chassis door plate, and the end of the support leg is overlapped with the chassis using the overlap plate;

[0028] The chassis lap plate 6 is U-shaped, and four protrusions 10 are symmetrically arranged inside the chassis lap plate 6, respectively arranged at the opening and bend of the chassis lap plate 6. The chassis lap plate 6 is connected to the chassis box in an embedded manner, that is, the four protrusions on the inner side and the bottom surface of the U-shaped lap plate are embedded in the interior of the chassis box, and the chassis side panels 7 and chassis bottom panels 8 are connected with holes at corresponding positions. The thickness of the chassis lap plate is the same as that of the leg lap plate, and the part embedded in the chassis box contacts and transmits force with the corresponding positions of the I-shaped lap plate of the leg. The inner side of the chassis door panel 9 contacts and transmits force with the side lap plate of the leg, and the upper surface of the chassis door panel contacts and transmits force with the upper cover plate of the leg. To ensure smooth extension and retraction of the legs, the height of the chassis box is generally 3-5mm larger than the height of the leg box. A 2-3mm gap is left at the side of the chassis lap plate and the leg lap plate, and a 2-3mm gap is left at the side of the chassis door panel and the leg lap plate.

[0029] like Figure 3 As shown, when the concrete pump truck is working normally, the outrigger extends to the end and is aligned with the U-shaped lap plate of the chassis. When the supporting surface is horizontal, the outrigger will be squeezed and contacted with the chassis at two places under the action of the vertical upward support reaction force, namely the bottom surface of the I-shaped lap plate at the end of the outrigger and the upper surface of the U-shaped lap plate of the chassis, and the upper cover plate of the outrigger and the lower surface of the chassis door panel. At this time, the upper and lower lap contact force transmission is carried out; when the outrigger is tilted at a small angle, the outrigger is subjected to lateral force. In addition to the upper and lower lap contact force transmission, the side surface of the I-shaped lap plate at the lap joint of the outrigger end is in contact with the embedded part of the U-shaped lap plate of the chassis, and the lap block set on the outrigger side plate at the lap joint of the front end of the outrigger is in contact with the side of the chassis door panel, which perfectly solves the side lap problem.

[0030] This patent design features a novel lap joint structure for telescopic outriggers on concrete pump trucks. The outrigger ends utilize an I-shaped plate and the embedded U-shaped plate of the chassis to form a high-rigidity lap joint. At the lap joint between the front end of the outrigger and the chassis door panel, lap blocks are installed on both side panels of the outrigger to form a lap joint with the chassis door panel. During normal support, the I-shaped plate at the end of the outrigger contacts and transmits force to the U-shaped plate at the base, while the front end of the outrigger contacts and transmits force to the chassis door panel. These contact areas are all in contact with the high-rigidity plates, minimizing overall deformation and enhancing structural stability. When the outrigger tilts at a small angle, the outrigger is subjected to lateral forces. The side of the I-shaped plate at the lap joint end of the outrigger contacts the inward extension of the U-shaped plate of the chassis, while the lap blocks installed on the side panels of the outrigger at the lap joint front of the outrigger contact the side of the chassis door panel, effectively resolving the side lap joint issue. Lapping groups are installed in all four directions of the lap joint: top, bottom, left, and right. This ensures structural stability when the outriggers are subjected to complex loads during pump truck support operation. The highly rigid contact areas effectively reduce stress and deformation at the lap joints, improving product reliability.

[0031] The technical solution of the present invention provides a high-rigidity overlap area, making the dismounting structure support more stable; the support legs increase the side overlap, and the structural strength and stability are guaranteed when the dismounting inclined support legs are subjected to lateral forces; the overlap plates are embedded in the connection, making the structure more stable.

[0032] Explanation of relevant terms:

[0033] Concrete pump truck: a type of engineering machinery that transports concrete to a designated location.

[0034] Outriggers: Outriggers are the structural parts that support the entire concrete pump truck when it is working.

[0035] Underframe: The structural component of a concrete pump truck that connects the slewing support and the outriggers. The upper part is connected to the slewing support, the lower part is connected to the subframe, and the outriggers are installed inside.

[0036] Overlap: When the concrete pump truck is working, in order to ensure safety, the ends of the outriggers extend out and have a part of overlapping area with the chassis. This area is the overlap area, and the contact and force transmission between the chassis and the outriggers is called overlap.

[0037] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A telescopic leg overlap structure, comprising a leg and a base frame overlap area, characterized in that: The chassis overlap area includes a chassis box body and a chassis overlap plate, and the chassis box body includes a chassis side plate, a chassis bottom plate, and a chassis door plate; The support leg includes a support leg box, a support leg lap plate and a lap block; the support leg box includes a support leg cover plate, a support leg bottom plate, and a support leg side plate; the end of the support leg is provided with a support leg lap plate, and the support leg side plate is symmetrically provided with lap blocks, and the lap blocks are provided at the position where the support leg contacts the bottom frame door plate; The front end of the support leg is overlapped with the inner side of the bottom frame door panel, and the end of the support leg is overlapped with the bottom frame using a overlap plate; The leg lap plate has a hole in the middle; the side of the leg lap plate is provided with protrusions, and there are four protrusions; the lap block is welded to the leg side plate, and the outer side of the lap block is aligned with the leg bottom plate and the leg cover plate.

2. The telescopic leg overlapping structure according to claim 1, characterized in that: The leg lap plate is in an I-shape.

3. The telescopic leg overlapping structure according to claim 1, characterized in that: The thickness of the leg lap plate is 20-40 mm.

4. The telescopic leg overlapping structure according to claim 1, characterized in that: The chassis lap plate is U-shaped, and the chassis lap plate is connected to the chassis box in an embedded manner.

5. The telescopic leg overlapping structure according to claim 1, characterized in that: The thickness of the chassis lap plate is the same as that of the leg lap plate.

6. A concrete pump truck, characterized in that: The concrete pump truck has the telescopic leg overlapping structure according to any one of claims 1 to 5.

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