An automatic centering and stowable automobile lifting pad device and a use method thereof

Abstract

The application discloses a kind of automatic centering storage type automobile crane pad plate device and use method, belong to engineering machinery technical field.Device includes pad plate assembly and positioning support;Pad plate assembly is equipped with from edge to center leg disc sliding groove, and one side of center position is equipped with center limiting device, and limiting slot and locking slot are equipped on center limiting device;Leg disc only has horizontal sliding degree of freedom in sliding groove;Positioning support is fixed below chassis, and locking insert plate is equipped on it.When using, pad plate assembly is extracted, leg disc is automatically slid to center limiting device along sliding groove and centered, and leg drives pad plate assembly to lift and support;When storing, pad plate assembly is withdrawn below chassis, locking slot is fixed with locking insert plate, and pad plate assembly is located within the boundary of vehicle body contour.The application realizes the automatic centering and quick storage and release of pad plate and leg, positioning accuracy can reach ±1cm, and pad plate is not exposed when translocating, eliminates scratch collision safety hazard, and is suitable for different tonnage automobile crane.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, specifically to a pad device for outriggers of truck cranes, and more particularly to an intelligent pad system and its working method that enables rapid positioning, automatic centering, and convenient deployment and retraction of outrigger pads, applicable to stable outrigger support operations for truck cranes of different tonnages in various operating scenarios. Background Technology

[0002] As a commonly used type of lifting machinery, the safety and efficiency of truck crane operations largely depend on the stable support of its outriggers. Outrigger pads, as a crucial connecting component between the outriggers and the ground, function to distribute the concentrated load of the outriggers to the ground, preventing the outriggers from sinking or tilting due to insufficient ground bearing capacity, thereby ensuring the overall stability of the truck crane operation. However, for a long time, truck crane outrigger pads and related operating methods have suffered from numerous technical shortcomings, hindering the safety, efficiency, and economy of truck crane operations.

[0003] I. Technical defects of traditional outrigger pad operation method In traditional truck crane operations, square timber or simple steel plates are commonly used as outrigger pads. During operation, operators must manually determine the placement of the pads based on their experience, move the timber or pads to the estimated contact points of each outrigger, and then make repeated adjustments by visual inspection. This method of operation has at least the following technical drawbacks: (1) Poor positioning accuracy and insufficient stability. The placement of timber or pads relies entirely on the operator's visual inspection and experience, lacking an effective positioning and guiding mechanism. The alignment deviation by manual visual inspection is generally greater than ±5cm, and in extreme working conditions, the deviation can reach more than 10cm. Load eccentricity can easily lead to the risk of crane tipping over. The pads cannot be precisely positioned under the outriggers, resulting in uneven load distribution on the outriggers, which seriously weakens the stability of the truck crane operation and can easily lead to major safety accidents such as tipping over under heavy load conditions.

[0004] (2) The setup and take-off process is cumbersome and the work efficiency is low. During the setup and take-off of the truck crane, the handling, placement, adjustment and recycling of the support plates are entirely done manually. Each support plate weighs tens of kilograms, and the operators need to repeatedly move and adjust its position, which is extremely time-consuming. Taking an 80T truck crane as an example, it takes about 45 minutes to set up the truck crane, which seriously restricts the working efficiency and relocation speed of the truck crane. Especially in construction sites where frequent relocation is required, the time cost loss is even more prominent.

[0005] (3) High material costs. Square timber has insufficient compressive strength and durability, and is prone to damage such as crushing, cracking and decay during repeated high-frequency and heavy-load operations of truck cranes. According to statistics, the annual loss rate of square timber is as high as 80%, requiring frequent purchase and replacement, which greatly increases the material costs of truck crane operations.

[0006] (4) High workload for operators. The entire process involves manual handling, adjustment, and replacement of pads, which is extremely labor-intensive for operators and requires a high level of experience, further reducing the convenience and safety of the overall operation.

[0007] II. Existing Improvement Technologies and Their Limitations To address the aforementioned technical issues, some existing technologies attempt to optimize and improve the outrigger pads. For example, Chinese utility model patent CN213679476U discloses a "truck crane stabilizing device," which includes a pad and a locking mechanism. The pad has a placement groove at its center, and the locking mechanism is evenly distributed around the circumference of the groove. The locking mechanism secures the pad to the disc at the bottom of the truck crane's outrigger, allowing the pad and outrigger to move synchronously. Its working principle is as follows: after a lifting operation is completed, the pad is secured to the outrigger disc via the locking mechanism. The truck crane's outriggers retract, causing the pad to rise with the outriggers and remain at the bottom. The truck crane carries the pad to the next lifting point. Upon arrival, the outriggers lower, allowing the pad to touch the ground, thus achieving synchronous transfer of the pad with the truck crane and avoiding manual handling of the pad.

[0008] However, this solution presents significant safety hazards in practical applications. Because the area of ​​the pad is much larger than the area of ​​the disc at the bottom of the outriggers (the pad area is typically around 1 square meter, while the outrigger disc area is only on the order of 0.1-0.2 square meters), even when the outriggers are fully retracted to their minimum height, the pad remains horizontally attached to the bottom of the outriggers. Its planar dimensions far exceed the outline of the vehicle's outriggers and body, inevitably exposing the edges of the pad to the external space of the vehicle chassis. In this state, when the truck crane carrying the pad travels on construction site roads or moves between sites, the exposed pad is highly susceptible to scraping or colliding with surrounding obstacles (such as temporary facilities, other machinery, and stacked materials), potentially damaging the pad itself and posing safety hazards to surrounding personnel and equipment. This safety hazard is particularly pronounced in construction sites with confined spaces, winding roads, and limited visibility. According to safety regulations for the external dimensions of motor vehicles, all auxiliary tools must not extend beyond the vehicle's outer contour during the relocation of construction machinery. This patented pad, permanently suspended at the bottom of the outriggers, cannot be retracted into the chassis contour, violating on-site transport safety management regulations and exhibiting compliance defects. In actual projects, most construction sites explicitly prohibit the transport of this device with the vehicle. In other words, while CN213679476U achieves the technical effect of synchronous movement of the pad with the outriggers through a snap-fit ​​connection, avoiding manual handling, its inherent defect of "the pad protruding outside the vehicle's contour" makes this solution difficult to implement safely during actual construction relocation, limiting its practical application value.

[0009] III. Summary of the Overall Level of Existing Technology In summary, existing truck crane outrigger pad technologies can be mainly divided into two categories: one is a simple pad represented by square timber, which is unguided and operated entirely manually. This type suffers from systemic defects such as large positioning deviations, low efficiency, high costs, high labor intensity, and high material consumption. The other type is an improved pad device represented by CN213679476U. Although it achieves connection and center positioning between the pad and the outrigger through a snap-fit ​​mechanism and a placement slot, this solution rigidly fixes the pad to the bottom of the outrigger, causing the pad to be exposed outside the vehicle's outline during relocation. This poses a serious safety hazard, and the safety risks and compliance issues during relocation cannot be resolved, limiting its application in actual construction relocation.

[0010] Therefore, developing an intelligent mat system that can achieve rapid positioning and convenient placement and retrieval of the mat, and can be safely stored within the vehicle's outline during relocation, has become an urgent technical problem to be solved in this field. Summary of the Invention

[0011] (a) The technical problem to be solved by this patent This invention aims to provide an automatically centering and retractable vehicle crane outrigger pad device and its usage method, in order to solve the following technical problems existing in the current vehicle crane outrigger pad operation methods: First, this invention addresses the problems of large positioning deviations and insufficient stability associated with traditional timber pads. Traditional timber pads rely entirely on operator visual inspection and experience for manual placement, lacking an effective positioning and guiding mechanism. Positioning deviations can reach ±5 cm, leading to uneven load distribution on the outriggers and severely impacting the safety of truck crane operations. This invention, through the synergistic action of a sliding guide and a central limiting device, achieves automatic alignment between the outrigger plate and the pad, with mechanical positioning accuracy stably controlled within ±1 cm. This fundamentally solves the problems of positioning deviations from manual visual inspection and the potential hazards of eccentric loads.

[0012] Secondly, this invention addresses the problems of cumbersome and inefficient pallet handling processes in existing systems. Traditionally, the handling, placement, adjustment, and retrieval of pallets rely entirely on manual labor. A typical 80t truck crane takes an average of 45 minutes to complete the entire pallet placement process, severely limiting the crane's operational efficiency and relocation speed. This invention eliminates the need for manual pallet handling. Through a push-pull slide design and a storage structure with positioning brackets and locking slots, pallets can be quickly extracted and inserted. Only a push-pull operation is required to remove and retrieve the pallets, significantly reducing the time required for loading and unloading the crane. The total loading and unloading time is reduced to less than 20 minutes, increasing operational efficiency by approximately 56%.

[0013] Third, this invention addresses the safety hazard of the pad being exposed outside the vehicle's outline during transport in existing improved technologies. While existing technologies, such as CN213679476U, achieve synchronous movement of the pad with the outriggers through a locking mechanism, the pad remains horizontally attached to the bottom of the outriggers during transport, with its edges exposed to the external space of the vehicle chassis. This makes it highly susceptible to scraping or colliding with surrounding obstacles, posing a serious safety hazard. Unlike the permanently suspended pad structure of CN213679476U, this invention retracts the pad under the truck crane chassis in its stowed state, placing it within the vehicle's outline boundary. Combined with a locking slot for secure attachment, this ensures the pad does not extend beyond the vehicle's outline during transport, completely eliminating the risk of scraping or collision during in-plant transport and short-distance transport.

[0014] Fourth, it solves the problem of high workload for operators. Traditionally, operators need to repeatedly move and adjust pads weighing tens of kilograms, resulting in extremely high labor intensity. This invention, through the coordinated operation of its components, allows operators to complete all operations simply by pushing or pulling handles, reducing labor costs by over 70%.

[0015] (II) Detailed description of the technical solution of this patent To achieve the above-mentioned objectives, the present invention adopts the following technical solution: 1. Overall structure of the device This invention provides an automotive hanger pad device, mainly comprising a pad assembly, a support leg plate groove, a center limiting device, upper and lower limiting structures, a positioning bracket, and a locking slot. The upper surface of the pad assembly is provided with a support leg plate groove extending from the edge of the pad assembly to its center position; a center limiting device is provided on one side of the center position of the pad assembly, and the center limiting device has a limiting groove.

[0016] The outrigger plate is slidably connected to the bottom of the outrigger of the truck crane in the outrigger plate groove. The outrigger plate can slide along the outrigger plate groove to the center limiting device and be limited by the limiting groove. The outrigger plate groove is provided with an upper and lower limiting structure, so that the outrigger plate only has horizontal sliding freedom in the outrigger plate groove and cannot move up and down relative to the outrigger plate groove.

[0017] The positioning bracket is fixedly installed below the truck crane chassis, and the positioning bracket is provided with a locking plate; the center limiting device is also provided with a locking slot. In the retracted state, the pad assembly is inserted and fixed to the locking plate via the locking slot. The pad assembly has a working state and a retracted state: In the working state, the pad assembly is separated from the positioning bracket, the outrigger plate is located at the center of the pad assembly and is limited by the center limiting device, the outrigger plate is coaxial with the center of the pad assembly, and the outrigger can drive the pad assembly to move horizontally and vertically via the outrigger plate; in the retracted state, the pad assembly is located below the truck crane chassis, one end of the pad assembly is inserted and fixed to the locking slot, and the pad assembly is located within the outline boundary of the vehicle body.

[0018] 2. Specific structure of each component (1) Pad assembly The pad assembly includes a pad body, which is a square or round plate with a diameter of 0.8㎡-1.2㎡. The upper surface of the pad body has a support plate groove extending from the edge to the center, and a central limiting device is fixedly installed on one side of the center position of the upper surface of the pad body. A push-pull handle is provided on the side of the pad assembly, allowing the operator to switch the pad assembly between its working and stored states by pushing and pulling the handle.

[0019] (2) Support leg plate groove and upper and lower limit structure The cross-sectional shape of the outrigger plate groove is a T-shaped groove or a dovetail groove. The outrigger plate is provided with a sliding fit part that matches the cross-sectional shape of the outrigger plate groove, and the sliding fit part is embedded in the outrigger plate groove. The upper and lower limiting structure is formed by matching the cross-sectional shape of the T-shaped groove or dovetail groove with the shape of the sliding fit part, so that the outrigger plate only has horizontal sliding freedom within the outrigger plate groove and cannot move up and down.

[0020] (3) Center limiting device The center limiting device is fixedly installed on one side of the center position of the upper surface of the pad body, and the device is provided with a limiting groove. When the support leg plate slides from the edge to the center position along the support leg plate slide groove, the support leg plate is limited by the limiting groove and cannot continue to slide. At this time, the support leg plate is automatically located at the geometric center of the pad, and the support leg and the center of the pad remain coaxial.

[0021] (4) Positioning bracket and locking plate The positioning bracket is fixedly connected to the truck crane chassis with bolts, and the locking plate is fixedly installed on the positioning bracket. In the retracted state, the locking slot on the pad assembly engages with the locking plate to lock it in place, ensuring that the pad does not shake or fall off during the operation of the truck crane, and that the entire pad remains within the vehicle body outline boundary.

[0022] 3. Working Methods The present invention also provides a method of using the car suspension pad device as described above, comprising the following steps: S1: Pulling out step. The operator pulls the push-pull handle located on the side of the pad assembly to pull the pad assembly outward from the positioning bracket under the truck crane chassis, so that the pad assembly is disengaged from the locking slot.

[0023] S2: Guiding Step. As the pad assembly continues to be pulled out, the outrigger disc, fixed to the bottom of the truck crane's outrigger, enters the outrigger disc slide groove from the inlet end and slides along the groove from the edge of the pad assembly towards the center. During this process, the outrigger disc slide groove applies a guiding force to the outrigger disc, forcing it to move towards the center along the groove trajectory.

[0024] S3: Limiting Step. When the support leg plate slides along the support leg plate groove to the center position of the pad assembly, the support leg plate is limited by the limiting groove of the center limiting device, and the center of the support leg plate and the pad assembly remain coaxial, thus completing the automatic alignment of the pad and the support leg.

[0025] S4: Lifting and lowering procedure. The outriggers of the truck crane extend and lower the outrigger plate, which, through upper and lower limiting structures, simultaneously extends and lowers the pad assembly, allowing the pad assembly to touch the ground for support. After the pad assembly touches the ground, the outrigger plate is horizontally limited by a central limiting device and vertically connected to the pad assembly through upper and lower limiting structures. The load of the truck crane outriggers is transferred to the center of the pad assembly through the outrigger plate, achieving stable support.

[0026] S5: Storage Steps. After the operation is completed, the outriggers raise the outrigger plate and base plate assembly and retract them to below the truck crane chassis. The operator pushes the push-pull handle inward to engage and lock one end of the base plate assembly with the locking plate, completing the storage process. In the stored state, the base plate assembly is located within the vehicle body outline boundary, ensuring safety during the truck crane's relocation.

[0027] (III) Beneficial Technical Effects Compared with the prior art, the present invention has the following beneficial effects: 1. Significantly Improved Operational Stability. This invention, through the coordinated operation of the outrigger disc groove extending from the edge of the pad to the center and the central limiting device, achieves fully automatic guidance and centering of the outrigger disc from entering the groove to being confined to the center. No manual visual positioning is required; the mechanically forced centering accuracy can reach ±1cm, compared to a deviation of over ±5cm with traditional manual methods, representing a 400% improvement in positioning accuracy. The load is concentrated at the center of the pad, and the pressure on the plate surface is evenly distributed, eliminating major safety accidents such as localized stress overload, ground subsidence, and crane rollover. After the outrigger disc is precisely confined to the center of the pad, the load of the truck crane's outriggers is evenly transferred to the center of the pad through the outrigger disc, ensuring uniform force distribution on the pad and significantly enhancing the stability of the truck crane operation, eliminating the safety hazard of rollover caused by pad misalignment.

[0028] 2. Significantly Improved Operational Efficiency. This invention utilizes a push-pull handle combined with a positioning bracket and locking slot storage structure to achieve rapid extraction and insertion of the pad. The entire process can be completed simply by the operator pushing or pulling the handle, eliminating the need for manual handling of pads weighing tens of kilograms. The time for a single truck crane loading and unloading operation is reduced from the traditional 45 minutes to less than 20 minutes, increasing operational efficiency by approximately 60%. This significantly improves the operational efficiency and relocation speed of truck cranes, making it particularly suitable for construction sites requiring frequent relocation.

[0029] 3. Completely Guaranteed Safety During Relocation. Compared to existing improved technologies such as CN213679476U, where the support plate is exposed outside the vehicle's outline during relocation, posing a risk of scraping and colliding with obstacles, this invention, in its stowed state, places the support plate assembly under the crane chassis. It is secured by a locking slot on the support plate, which is inserted and fixed to the positioning bracket. The entire support plate assembly remains within the vehicle's outline boundary, not exceeding the outline of the chassis and outriggers. When the crane travels on construction site roads or relocates, the support plate will not come into contact with surrounding obstacles, completely eliminating the risk of scraping and collision, and ensuring the safety of personnel and equipment at the construction site.

[0030] 4. Significantly reduced operator workload. This invention simplifies the arduous manual handling and repeated adjustments required in traditional methods to a single push-pull handle action through the coordinated operation of various components. Operators no longer need to carry tens of kilograms of pads or bend over to adjust their position, significantly reducing labor intensity and lowering the skill level required of operators, thus improving the overall convenience and comfort of the operation.

[0031] 5. Simple structure, controllable cost, and strong applicability. The components of this invention have simple structures and mature manufacturing processes, requiring no complex control systems or power sources, thus keeping manufacturing costs under control. The base plate itself is a square or round plate of 0.8㎡-1.2㎡, which can be selected according to the actual needs of different tonnage truck cranes, offering strong adaptability. The positioning bracket is fixedly connected to the truck crane chassis with bolts, making installation convenient. The positioning bracket uses standard chassis bolt hole positions for installation, eliminating the need for cutting or welding modifications to the original chassis, with modification time less than 30 minutes. The entire device has no hydraulic or electrical auxiliary power systems; its purely mechanical structure results in a low failure rate and extremely low maintenance costs. Attached Figure Description

[0032] Figure 1 This is a partial structural schematic diagram of the automotive suspension pad device of the present invention (in working condition). Figure 2 This is a schematic diagram of the connection between the locking plate and the locking slot of the present invention (in the stored state). Figure 3 This is a schematic diagram of the car suspension pad device of the present invention in its stored state; Figure 4 This is a schematic diagram of the car suspension pad device of the present invention in the withdrawn state; Figure 5 This is a schematic diagram of the working state of the automobile suspension pad device of the present invention (outriggers extended, pad supporting the ground). The meanings of the markings in the diagram are as follows: 100—Platform assembly; 101—Platform body; 110—Outrigger plate groove; 111—Inlet end; 120—Center limit device; 121—Limit groove; 122—Locking slot; 122a—Locking slot sealing plate; 130—Push-pull handle; 200—Outrigger plate; 300—Positioning bracket; 310—Locking insert; 4. Truck crane outriggers. Detailed Implementation

[0033] To make the technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the present invention.

[0034] Example 1 like Figure 1 and Figure 2 As shown, the present invention provides an automobile suspension pad device, including a pad assembly 100, a support leg plate 200, and a positioning bracket 300.

[0035] The pad assembly 100 includes a pad body 101. The pad body 101 is made of steel plate, specifically Q235B structural steel. The dimensions of the pad body 101 are determined according to the tonnage of the truck crane, preferably a square or round plate of 0.8㎡-1.2㎡. In this embodiment, the pad body 101 is a 1.0㎡ square steel plate with a side length of 1000mm and a thickness of 16mm. The thickness of the pad body 101 can be adaptively adjusted according to the maximum load of the truck crane.

[0036] The upper surface of the pad body 101 is provided with a leg plate groove 110. The leg plate groove 110 extends from the edge of the pad body 101 to the center of the pad body 101, forming a straight guide channel. The width of the leg plate groove 110 is adapted to the size of the leg plate 200 at the bottom of the truck crane outrigger 4, ensuring that the leg plate 200 can slide smoothly in the groove without jamming. The inlet end 111 of the leg plate groove 110 is located at the edge of the pad body 101 and is flared to facilitate the entry of the leg plate 200 into the groove.

[0037] In one optional embodiment, a center limiting device 120 is provided on one side of the center position of the pad body 101. The center limiting device 120 is fixedly disposed on the upper surface of the pad body 101, located at the end of the support leg plate slide groove 110. The center limiting device 120 is provided with a limiting groove 121, the contour of which is adapted to the shape of the support leg plate 200. When the support leg plate 200 slides along the support leg plate slide groove 110 to the center position, the support leg plate 200 is embedded in the limiting groove 121 and is limited, at which time the support leg plate 200 and the geometric center of the pad body 101 remain coaxial.

[0038] The cross-sectional shape of the outrigger plate groove 110 is a T-shaped groove. Correspondingly, the outrigger plate 200 is provided with a sliding fit part that matches the cross-sectional shape of the outrigger plate groove 110. The sliding fit part is embedded in the outrigger plate groove 110, so that the outrigger plate 200 only has the horizontal sliding freedom along the extension direction of the groove within the outrigger plate groove 110, and cannot move up and down relative to the outrigger plate groove 110. In other words, the T-shaped cross-section of the outrigger plate groove 110 and the sliding fit part of the outrigger plate 200 together constitute an upper and lower limiting structure—the sliding fit part of the outrigger plate 200 is clamped by the upper and lower flanges of the T-shaped groove, and is also limited in the horizontal direction (perpendicular to the extension direction of the groove), and can only slide along the extension direction of the groove, while the vertical direction is completely constrained and cannot disengage from the groove. Through this upper and lower limiting structure, when the outriggers of the truck crane drive the outrigger plate 200 to rise or fall, the outrigger plate 200 can drive the pad assembly 100 to rise and fall synchronously; when the outrigger plate 200 extends and retracts in the horizontal direction, the outrigger plate 200 can also drive the pad assembly 100 to move horizontally synchronously. It should be noted that the T-slot is only a preferred embodiment. In other embodiments, the cross-sectional shape of the outrigger plate slide groove 110 can also adopt a structure with a similar limiting function.

[0039] A push-pull handle 130 is provided on the side of the pad body 101. The push-pull handle 130 is fixedly welded to the edge of the pad body 101, making it easy for the operator to grip and apply force. By using the push-pull handle 130, the operator can easily pull out or push back the pad assembly 100 from under the truck crane chassis.

[0040] The positioning bracket 300 is fixedly installed under the truck crane chassis, near the outrigger 4, where there is sufficient space for installation and storage. The positioning bracket 300 is bolted to the connecting holes on the main beam or crossbeam of the truck crane chassis, requiring no modification to the existing chassis. The installation location of the positioning bracket 300 under the truck crane chassis is chosen in an area near the outrigger that does not interfere with the outrigger's extension and retraction movement. It occupies minimal space and will not interfere with existing components of the truck crane chassis such as the drive shaft, exhaust pipe, or outrigger extension and retraction mechanism.

[0041] A locking plate 310 is fixed on the positioning bracket 300. A locking slot 122 is provided on the pad assembly 100 (preferably on the central limiting device 120). The opening direction of the locking slot 122 is consistent with the pushing and pulling direction of the pad assembly 100, and it is used to engage with the locking plate 310 in the retracted state. In this embodiment, the locking slot 122 has a T-shaped groove structure. A locking slot sealing plate 122a is provided at one end of the locking slot 122 near the support leg plate 200. The locking slot sealing plate 122a is fixedly disposed at the end of the locking slot 122 and is used to limit and stop the locking plate 310 in the retracted state.

[0042] The locking plate 310 is fixedly mounted on the positioning bracket 300. In this embodiment, the locking plate 310 is a plate-shaped structure that is adapted to the T-shaped groove of the locking slot 122, and the insertion end of the locking plate 310 is wedge-shaped.

[0043] When the pad assembly 100 is pushed inward to its retracted position, the locking insert 310 is inserted into the T-slot from the open end of the locking slot 122. As the pad assembly 100 continues to move inward, the locking insert 310 slides along the T-slot until its wedge-shaped portion gradually engages with the wall of the T-slot. At the same time, the front end of the locking insert 310 is stopped and limited by the locking slot sealing plate 122a, preventing the locking insert 310 from sliding out of the front end of the locking slot 122. Under the dual action of wedge clamping and sealing plate limiting, the locking insert 310 and the locking slot 122 form a tight fit, firmly locking the pad assembly 100 in its retracted position under the truck crane chassis, preventing it from shifting or falling off during the operation of the truck crane.

[0044] In this retracted state, one end of the pad assembly 100 is locked to the locking plate 310 via the locking slot 122, while the other end of the pad assembly 100 (i.e., the end where the outrigger plate groove 110 is located) remains fitted onto the outrigger plate 200, which is located within the outrigger plate groove 110. In other words, in the retracted state, the pad assembly 100 does not need to be removed from the outrigger plate 200; the two remain connected, with the pad assembly 100 secured to the truck crane chassis solely through the engagement of the locking plate 310 and the locking slot 122. This structure allows the operator to simply pull out the pad assembly 100 to begin work the next time, without needing to re-attach it to the outrigger plate 200, further reducing operational steps and improving work efficiency.

[0045] When it is necessary to switch the pad assembly 100 to the working state, the operator pulls the push-pull handle 130 outward, the locking plate 310 is disengaged from the locking slot 122, and the pad assembly 100 can be easily pulled out.

[0046] The center limiting device 120 is provided with a limiting groove 121 and a locking slot 122. The limiting groove 121 is used to center-limit the outrigger plate 200 in the working state; the locking slot 122 is used to engage with the locking plate 310 on the positioning bracket 300 in the stored state. The limiting groove 121 is located on the side of the center limiting device 120 facing the outrigger plate slide groove 110, and the locking slot 122 is located on the side of the center limiting device 120 away from the outrigger plate slide groove 110. The two do not interfere with each other in space.

[0047] The pad assembly 100 has two working modes: working state and storage state.

[0048] like Figure 4 and Figure 5 As shown, in the working state, the pad assembly 100 is separated from the positioning bracket 300, and the pad assembly 100 is pulled out from under the truck crane chassis to a position directly under the outrigger. At this time, the outrigger plate 200 is located at the center of the pad assembly 100 and is limited by the limiting groove 121 of the center limiting device 120. The center of the outrigger plate 200 and the pad assembly 100 are coaxial. The truck crane outrigger 4 drives the pad assembly 100 to move horizontally and vertically through the outrigger plate 200, so that the lower surface of the pad body 101 contacts the ground, forming a stable support for the truck crane outrigger. In this state, the upper surface of the pad body 101 and the outrigger plate 200 are connected through a T-slot. The outrigger plate 200 is limited in the horizontal direction by the center limiting device 120, and in the vertical direction, it is connected to the pad assembly 100 through the upper and lower limiting action of the T-slot, ensuring a reliable load transmission path.

[0049] like Figure 2 and Figure 3 As shown, in its stowed state, the pad assembly 100 is located under the truck crane chassis, and the locking slot on the pad assembly 100 engages with the locking plate 310 to achieve locking. At this time, the pad assembly 100 is entirely within the outline of the truck crane body, not exceeding the outline of the vehicle chassis and outriggers. During the truck crane's movement or relocation, the pad assembly 100 is reliably fixed under the chassis, preventing it from falling off due to bumps or colliding with surrounding obstacles.

[0050] The pad assembly 100 is placed horizontally under the chassis of the truck crane in its stowed state. For example... Figure 3 As shown, after the pad assembly 100 is stowed, its height is only about the thickness of the pad body 101 (e.g., 16mm) lower than the ground clearance of the truck crane chassis. This has minimal impact on the original ground clearance of the truck crane chassis (250mm-400mm), ensuring that the pad assembly 100 will not scrape or collide with the ground when the truck crane moves on the construction site. Simultaneously, the projection of the pad assembly 100 on the horizontal plane lies entirely within the outline of the truck crane's body, not exceeding the outer edges of the vehicle chassis and outriggers. In other words, the pad assembly 100, when stowed, fully utilizes the unused space under the truck crane chassis, neither affecting the truck crane's maneuverability nor increasing the vehicle's overall dimensions during operation.

[0051] The following is a detailed description of how to use the car suspension pad device of the present invention.

[0052] The method of using the car suspension pad device of the present invention includes the following steps: S1: Extraction step.

[0053] After the truck crane arrives at the work site, the operator holds the push-pull handle 130 and applies a pulling force away from the truck crane chassis to pull the pad assembly 100 out of the positioning bracket 300. As the pad assembly 100 is pulled out, the locking slot at one end of the pad assembly 100 separates from the locking insert 310.

[0054] S2: Guiding Steps.

[0055] As the pad assembly 100 is further pulled outward, the outrigger plate 200, fixedly mounted at the bottom of the outrigger of the truck crane, slides along the outrigger plate groove 110. During the operator's continued pulling of the pad assembly 100 outward, the outrigger plate 200 remains stationary (as it is fixed to the bottom of the outrigger), while the pad assembly 100 moves outward relative to the outrigger plate 200. Therefore, the outrigger plate 200 slides along the outrigger plate groove 110 from the edge of the pad body 101 towards the center. The sidewall of the outrigger plate groove 110 applies a guiding force to the outrigger plate 200, ensuring that the outrigger plate 200 slides along the groove trajectory and does not deviate from its direction.

[0056] S3: Limiting step.

[0057] like Figure 4 As shown, when the support leg plate 200 slides along the support leg plate groove 110 to the center position of the pad body 101, the support leg plate 200 is limited by the limiting groove 121 of the center limiting device 120 and cannot continue to slide towards the center. At this time, the support leg plate 200 and the geometric center of the pad assembly 100 remain coaxial, that is, the support leg plate 200 is precisely located at the center position of the pad body 101, realizing the automatic centering of the pad and the support leg. The entire process does not require manual visual positioning by the operator, and the positioning accuracy can reach ±1cm.

[0058] S4: Lifting / lowering steps.

[0059] like Figure 5 As shown, the operator operates the outrigger control handle of the truck crane, causing the outrigger 4 to extend outward and lower the outrigger plate 200. Since the outrigger plate 200 is embedded in the T-shaped groove of the outrigger plate slide 110, the side wall of the T-shaped groove provides a horizontal limit for the outrigger plate 200. Simultaneously, under its own weight, the upper contact surface of the pad assembly 100 remains in close contact with the upper surface of the outrigger plate 200 without gaps. Therefore, when the outrigger plate 200 extends horizontally outward, it drives the pad assembly 100 to extend synchronously; when it descends vertically, the upper contact surface of the T-shaped groove drives the pad assembly 100 to descend synchronously, allowing the pad body 101 to touch the ground for support.

[0060] After the base plate body 101 touches the ground, the outriggers continue to descend to the predetermined support height. The load of the truck crane outriggers is transferred to the center of the base plate body 101 via the outrigger plate 200. During this process, the outrigger plate 200 is horizontally limited by the center limiting device 120, preventing horizontal displacement; vertically, it remains connected to the base plate assembly 100 via a T-slot, ensuring a reliable load transfer path. The base plate body 101 distributes the concentrated load of the outriggers to the ground, effectively preventing ground subsidence.

[0061] S5: Storage steps.

[0062] After the hoisting operation is completed, the operator operates the outrigger control handle, causing the outriggers to lift the outrigger plate 200. The outrigger plate 200, through the upper and lower limit action of the T-slot, simultaneously lifts the pad assembly 100, causing the pad body 101 to leave the ground. Subsequently, the outriggers continue to retract the outrigger plate 200 and the pad assembly 100 inwards to the storage position under the truck crane chassis (see reference). Figure 4 ).

[0063] After the pad assembly 100 is retracted under the chassis, the operator holds the push-pull handle 130 and applies a pushing force towards the truck crane chassis to push the pad assembly 100 inward. Figure 2 At this point, the pad assembly 100 is entirely within the outline boundary of the truck crane body, completing its storage (see reference). Figure 3 Truck cranes can be safely moved or transported.

[0064] After storage, one end of the pad assembly 100 is locked onto the positioning bracket 300 by the locking insert 310, while the other end remains fitted onto the outrigger plate 200. The pad assembly 100 remains connected to the outrigger plate 200 but is fixed relative to the truck crane chassis, ensuring that the pad assembly 100 does not shake or fall off during driving.

[0065] Instructions on ground leveling In practical use, before the pad body 101 touches the ground, the operator should perform necessary leveling treatment on the ground beneath the pad body 101 according to the ground conditions of the work site. For soft ground, it should be compacted beforehand; for uneven ground, leveling materials such as gravel or sand should be laid beforehand to ensure that the pad body 101 makes full contact with the ground and bears force evenly after touching the ground. Ground leveling is a routine operating procedure for crane outrigger operations and does not affect the implementation effect of the technical solution of this invention. This invention ensures that the pad body 101 accurately lands directly under the outrigger through the linkage between the pad assembly and the outrigger plate. On this basis, the ground leveling measures can further ensure the stable support effect of the pad.

[0066] Explanation of usage scenarios The vehicle crane pad device of the present invention is mainly suitable for short-distance relocation operations within the construction site. For example, when moving from one hoisting point to another within the same construction site, there is no need for manual handling of the pad. The pad assembly 100 can be safely stored under the chassis of the vehicle crane by the insertion and engagement of the locking insert 310 and the locking slot 122, and the whole assembly is located within the vehicle body outline boundary, avoiding scratches and collisions with temporary facilities, other equipment or materials when driving on the construction site road.

[0067] When the construction project is completed and the truck crane needs to leave the construction site and enter public roads for long-distance normal travel, the operator can first unlock the locking plate 310 from the locking slot 122. The outrigger 4 of the truck crane will then move the pad assembly 100 and place it on the ground. Next, the outrigger 4 will move the outrigger plate 200 relative to the outrigger plate groove 110, completely separating the outrigger plate 200 from the pad assembly 100. Subsequently, the positioning bracket 300 will be removed from the truck crane chassis (the positioning bracket 300 is connected to the chassis by bolts, making disassembly and assembly convenient). The truck crane will then be restored to its original state and can be driven away from the construction site in normal road conditions. The pad assembly 100 and the positioning bracket 300 can be stored as independent components or carried with the truck for reinstallation and use during the next construction project.

[0068] In other words, the pad device provided by this invention can conveniently and quickly deploy and safely relocate the pad during construction; it can also be quickly disassembled after construction is completed without affecting the normal road driving performance of the truck crane. This detachable design ensures both operational efficiency and safety during construction, while also taking into account the actual needs of truck cranes as engineering vehicles that require frequent long-distance transfers between different construction sites.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and equivalent substitutions can be made to the present invention without departing from its principles, and all such modifications and equivalent substitutions should be included within the scope of protection of the present invention.

Claims

1. A car suspension pad device, characterized in that, include: A pad assembly (100) has a support leg plate groove (110) on its upper surface, the support leg plate groove (110) extending from the edge of the pad assembly (100) to the center of the pad assembly (100); a center limiting device (120) is provided on one side of the center of the pad assembly (100), the center limiting device (120) having a limiting groove (121) and a locking slot (122). The outrigger disc (200) at the bottom of the outrigger (4) of the truck crane is slidably connected in the outrigger disc groove (110). The outrigger disc (200) can slide along the outrigger disc groove (110) to the center limiting device (120) and be limited by the limiting groove (121). The outrigger disc groove (110) is provided with an upper and lower limiting structure, so that the outrigger disc (200) only has horizontal sliding freedom in the outrigger disc groove (110) and cannot move up and down relative to the outrigger disc groove (110). A positioning bracket (300) is fixedly installed below the chassis of the truck crane, and a locking plate (310) is provided on the positioning bracket (300). The pad assembly (100) has a working state and a storage state: In the working state, the pad assembly (100) is separated from the positioning bracket (300), the outrigger plate (200) is located at the center of the pad assembly (100) and is limited by the center limiting device (120), the outrigger plate (200) is coaxial with the center of the pad assembly (100), and the outrigger (4) can drive the pad assembly (100) to move horizontally and vertically through the outrigger plate (200); In the storage state, the pad assembly (100) is located below the chassis of the truck crane, the locking slot (122) on the pad assembly (100) is inserted and fixed with the locking plate (310), and the pad assembly (100) is located within the outline boundary of the vehicle body.

2. The automobile suspension pad device according to claim 1, characterized in that, The cross-sectional shape of the support leg plate groove (110) is a T-shaped groove or a dovetail groove. The support leg plate (200) is provided with a sliding fit part that matches the cross-sectional shape of the support leg plate groove (110). The sliding fit part is embedded in the support leg plate groove (110) so that the support leg plate (200) has only horizontal sliding freedom in the support leg plate groove (110) and cannot move up and down.

3. The automobile suspension pad device according to claim 1, characterized in that, The pad assembly (100) is provided with a push-pull handle (130) on its side. The pad assembly (100) can be switched between working state and storage state by pushing and pulling the push-pull handle (130).

4. The automobile suspension pad device according to claim 1, characterized in that, The pad assembly (100) includes a pad body (101), which is a square or round plate with a diameter of 0.8㎡-1.2㎡; the support leg plate groove (110) extends from the edge of the pad body (101) to the center of the pad body (101), and the center limiting device (120) is fixedly disposed on one side of the center of the upper surface of the pad body (101).

5. The automobile suspension pad device according to claim 1, characterized in that, The positioning bracket (300) is fixedly connected to the truck crane chassis by bolts; the locking plate (310) is fixedly installed on the positioning bracket (300), and the pad assembly (100) is locked by the locking slot (122) and the locking plate (310) in the storage state.

6. A method of using the automobile suspension pad device according to any one of claims 1-5, characterized in that, Includes the following steps: S1: Pull the pad assembly (100) outward from the positioning bracket (300) under the truck crane chassis, so that the locking slot (122) on the pad assembly (100) is disengaged from the locking insert (310) on the positioning bracket (300); S2: As the pad assembly (100) is further pulled out, the support leg plate (200) enters the support leg plate groove (110) from the inlet end (111) of the support leg plate groove (110) and slides along the support leg plate groove (110) from the edge of the pad assembly (100) toward the center. S3: When the support leg plate (200) slides along the support leg plate groove (110) to the center position of the pad assembly (100), the support leg plate (200) is limited by the limiting groove (121) of the center limiting device (120), and the support leg plate (200) and the center of the pad assembly (100) remain coaxial; S4: The outrigger (4) of the truck crane drives the outrigger plate (200) to extend outward and descend. The outrigger plate (200) drives the pad assembly (100) to extend outward and descend synchronously through the upper and lower limiting structure, so that the pad assembly (100) touches the ground for support. S5: After the operation is completed, the outrigger (4) drives the outrigger plate (200) and the pad assembly (100) to rise and retract to the bottom of the truck crane chassis, and pushes the pad assembly (100) inward so that the locking slot (122) on the pad assembly (100) is engaged and locked with the locking plate (310) on the positioning bracket (300) to complete the storage.

7. The method of use according to claim 6, characterized in that, In step S4, after the pad assembly (100) touches the ground, the outrigger plate (200) is limited in the horizontal direction by the center limiting device (120) and is connected to the pad assembly (100) in the vertical direction through the upper and lower limiting structures. The load of the truck crane outrigger (4) is transmitted to the center position of the pad assembly (100) through the outrigger plate (200).

8. The method of use according to claim 6, characterized in that, In step S1, the pad assembly (100) is pulled out by pulling the push-pull handle (130) located on the side of the pad assembly (100); in step S5, the pad assembly (100) is pushed back by pushing the push-pull handle (130) and locked by inserting it into the locking plate (310).

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