Foldable counterweight device for tail of box-shaped crane

Abstract

The utility model relates to a kind of collapsible box hoist tail counterweight device, belong to hoisting vehicle technical field, including modular folding box structure, quick locking mechanism, medium filling and unloading assembly and antiskid wear-resistant component, modular box is made of a chassis, four side plates and a top plate, form the cuboid box with top opening after unfolding, volume can be compressed to 1 / 5 below in unfolded state after folding, greatly facilitate transportation and storage, the stability of quick locking mechanism after box unfolding is ensured by heavy hinge, L type lock catch and safety bolt, by top filling port can be loaded into gravel and other media to realize counterweight, side plate bottom is equipped with unloading port to facilitate quick emptying, the antiskid wear-resistant component set on the chassis bottom can effectively protect platform surface and prevent box sliding, the utility model has the advantages of convenient transportation, weight adjustable, strong adaptability, safe and reliable, effectively overcome the problems, such as high transportation cost, poor universality, low resource utilization of traditional counterweight scheme.

Description

Technical Field

[0001] This utility model relates to a foldable box-type crane tail counterweight device, belonging to the field of lifting vehicle technology. It is particularly suitable for various lifting vehicles such as truck cranes and crawler cranes. By combining a modular folding structure with a stone filling medium, it achieves a balance between convenient transportation, adjustable weight, and operational safety. It can be widely used in engineering scenarios such as building construction, bridge erection, and equipment handling. Background Technology

[0002] In lifting operations, the crane's rear counterweight is a core component for balancing lifting torque and preventing vehicle tipping. Currently, the mainstream crane counterweight solutions in the industry primarily use solid cast iron blocks or concrete counterweights. However, these traditional solutions have several unresolved drawbacks in practical applications: 1. Low transportation efficiency and high cost; Traditional counterweights are incompressible solid structures, with a single block weighing several tons. To meet the counterweight requirements of large cranes (usually tens to hundreds of tons), multiple heavy-duty transport vehicles are needed. This not only occupies a large amount of road resources during transportation but also generates high logistics costs, especially when operating across regions or transporting to remote areas, where the cost and time losses are even more pronounced.

[0003] 2. Low resource utilization and poor versatility; The weight of the counterweight is fixed and cannot be flexibly adjusted according to different crane tonnages and lifting conditions (such as lifting weight and lifting radius). For example, a counterweight configured for a 25-ton crane cannot be used with a 50-ton crane; a counterweight designed for small-radius, light-load operations becomes completely ineffective in large-radius, heavy-load operations, resulting in a high rate of idle counterweights and serious resource waste. Furthermore, in non-operational states (such as during transportation and storage), the counterweight, as "dead weight," occupies a significant amount of storage space, further reducing resource utilization.

[0004] 3. Poor adaptability to on-site conditions; In remote mountainous areas and rural areas with poor transportation, traditional heavy counterweights face problems such as insufficient road load-bearing capacity and bridge weight restrictions, making it difficult to transport them to the work site. This results in cranes being unable to carry out operations as planned, delaying the project progress.

[0005] 4. Lack of flexibility in weight adjustment; If the traditional counterweight is insufficient, it will directly increase the risk of the crane tipping over; if the weight is excessive, it will increase the load on the crane chassis, accelerate tire wear and fuel consumption, and reduce the vehicle's service life.

[0006] Although some companies have tried temporary solutions such as "sandbag counterweights" and "water bag counterweights," sandbags are prone to moisture absorption and weight gain, and water bags are prone to leakage. Both also suffer from low weight control precision and weak impact resistance, failing to meet the demands of high-intensity, high-precision lifting operations. Therefore, the industry urgently needs a crane tail counterweight solution that is efficient, cost-effective, weight-adjustable, and safe. Utility Model Content

[0007] This utility model overcomes the shortcomings of the existing technology and provides a foldable box crane tail counterweight device to realize the operation mode of "empty box folding transportation + on-site filling with stones", thereby achieving the goals of reducing transportation costs, flexibly adjusting weight, improving resource utilization, and ensuring safe and reliable operation.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a foldable box-type crane tail counterweight device, comprising: The modular folding box structure consists of 6 pieces: a base frame, 4 side panels, and a top panel. When unfolded, it forms a cuboid box with an open top. When folded, its volume can be compressed to less than 1 / 5 of its unfolded state, making it easy to transport and store. The quick-locking mechanism, including heavy-duty hinges, L-shaped latches, and safety pins, is used to secure the folded box after it is unfolded, ensuring that the box remains stable during counterweight operations. A media filling and unloading assembly includes a filling port and an unloading port, wherein the filling port is disposed on the top plate and the unloading port is disposed at the bottom of the side plate; Anti-slip and wear-resistant components: Wear-resistant rubber pads are installed at the four corners of the bottom of the base frame. The rubber pads are fixed to the base frame with bolts. On the one hand, this can prevent the box from scratching the platform surface when it is placed on the counterweight platform at the rear of the crane. On the other hand, it can increase the friction between the box and the platform and prevent the box from sliding during operation.

[0009] Furthermore, each of the side panels is connected to the base frame via heavy-duty hinges or hinges to ensure smooth rotation and no deformation during the unfolding and folding of the side panels.

[0010] Furthermore, L-shaped latches are welded to the vertical edges of adjacent side panels, i.e., the four upright positions of the box. After unfolding the side panel, rotate the L-shaped latches to engage with the latch seats of the adjacent side panels, and then insert the steel safety pins to form a double lock to prevent the side panels from loosening during operation.

[0011] Furthermore, one or two rectangular filling openings are provided on the top plate, each filling opening is equipped with an independent flip-up small cover plate, the cover plate is connected to the top plate by a hinge, and a rubber sealing strip is installed on the edge of the cover plate to prevent rainwater from seeping in; a guide slope plate is welded to the inside of the filling opening to facilitate the quick filling of stones and avoid accumulation at the edge of the filling opening.

[0012] Furthermore, a rectangular discharge port is opened at the bottom of one of the side panels, and a movable door panel is installed on the outside of the discharge port. The movable door panel is fixed to the side panel by bolts or quick clamps. A rubber sealing gasket is pasted on the inside of the door panel to prevent material leakage when filling with stones. When discharging, the door panel can be opened by loosening the bolts or opening the quick clamps to achieve rapid emptying of stones.

[0013] Compared with the prior art, the present invention has the following advantages.

[0014] 1. Transportation efficiency is greatly improved, and costs are significantly reduced; The volume of the folded empty box is less than 1 / 5 of its unfolded state. The traditional counterweight, which originally required one heavy transport vehicle to transport, can now be transported by one light truck instead of one heavy transport vehicle. At the same time, the on-site filling with stones (without the need to purchase special counterweight media) can save the production and procurement costs of traditional counterweight blocks, reducing the overall cost by 60%-80%.

[0015] 2. The weight is flexible and adjustable, making it highly versatile; This invention can adjust the counterweight weight by controlling the amount of gravel filling according to the crane tonnage and lifting conditions (e.g., filling with 5 tons of gravel when lifting a 10-ton object, and filling with 10 tons of gravel when lifting a 20-ton object). It can adapt to different crane models and different operating needs, eliminating the need to configure counterweight separately for each working condition, and improving resource utilization by more than 90%.

[0016] 3. Highly adaptable to on-site conditions; This invention uses stones as a filling medium, which are readily available in construction, road building and other scenarios, eliminating the need for long-distance transportation. The foldable empty box can be transported by ordinary trucks or even small pickup trucks, easily meeting the transportation needs of remote areas and narrow roads, and solving the problem of traditional counterweights being "unable to be transported in or used".

[0017] 4. Safe, reliable, and easy to operate; This utility model adopts a modular folding structure and is fixed by heavy-duty hinges and double locking mechanism. It has strong load-bearing capacity and high stability, and can withstand the impact and vibration during hoisting operations. No special equipment is required for the filling and unloading process. Two people can complete the filling or emptying within 30 minutes. The operation efficiency is much higher than that of traditional counterweights (traditional counterweights require crane assistance and take 2-3 hours to load and unload).

[0018] In summary, this utility model adopts an innovative model of "foldable box + on-site stone filling", which means that the box can be folded and stored in the empty state, greatly reducing the transportation volume and weight; after arriving at the work site, the readily available stones are used as the filling medium, and the counterweight weight is adjusted as needed, fundamentally solving the defects of traditional counterweight schemes. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a top view of the structure of this utility model.

[0022] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 4 This is the folding process state of the present invention. Figure 1 .

[0024] Figure 5 This is the folding process state of the present invention. Figure 2 .

[0025] Figure 6 This is the folding process state of the present invention. Figure 3 .

[0026] Figure 7 This is the folding process state of the present invention. Figure 4 .

[0027] Figure 8 This is the folding process state of the present invention. Figure 5 .

[0028] Figure 9 This is the folding process state of the present invention. Figure 6 .

[0029] Figure 10 This is a schematic diagram of the folded transportation state of this utility model.

[0030] In the diagram: 1 is the modular folding box structure, 2 is the unloading port, 3 is the loading port, 4 is the quick locking mechanism, and 5 is the gravel. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments.

[0032] like Figures 1-10 As shown, this utility model discloses a foldable box-type crane tail counterweight device, which mainly consists of four parts: a modular foldable box structure, a quick-locking mechanism, a media filling and unloading assembly, and an anti-slip and wear-resistant assembly. The specific structural design is as follows: 1. Modular folding box structure; The entire structure consists of 6 pieces: a base frame, 4 side panels, and a top panel. When unfolded, it forms a rectangular box with an open top (the dimensions can be designed according to the crane requirements, such as 2000mm long × 1200mm wide × 800mm high). When folded, the volume can be compressed to less than 1 / 5 of the unfolded state, making it easy to transport and store.

[0033] Materials and Structures of Each Component: The base frame, side panels, and top panel all adopt a "profile frame + steel plate panel" structure. The frame is made of channel steel, round steel, angle steel, or rectangular tube (selected according to load-bearing requirements, such as 5# channel steel for load-bearing capacity below 5 tons, and 8# channel steel for load-bearing capacity of 5-10 tons) and welded together. The panel is made of 2-5mm thick Q235 steel plate and is fixed to the frame through a full welding process to ensure the overall structural strength and achieve static load stability and dynamic impact safety.

[0034] 2. Quick-locking mechanism; Used to secure the unfolded folding box, ensuring stability during counterweight operations, including heavy-duty hinges and an L-shaped lock + safety pin structure.

[0035] Heavy-duty hinges: Each side panel is connected to the base frame by 4-6 heavy-duty hinges (the number is adjusted according to the size of the side panel, such as 6 hinges for a 1500mm high side panel). The hinges are made of manganese steel and have a load-bearing capacity of no less than 500kg / piece, ensuring smooth rotation and no deformation during the unfolding and folding of the side panel.

[0036] L-shaped latches + safety pins: L-shaped latches (latch thickness not less than 10mm) are welded to the vertical edges of adjacent side panels (i.e., the four column positions of the box). After unfolding the side panel, rotate the L-shaped latches to lock them into the latch seats of the adjacent side panels, and then insert a 12mm diameter steel safety pin to form a double lock and prevent the side panels from loosening during operation.

[0037] 3. Media filling and unloading assembly; Filling ports: 1-2 rectangular filling ports (size such as 400mm×600mm) are opened on the top plate. Each filling port is equipped with an independent flip-up small cover plate. The cover plate is connected to the top plate by a hinge. A rubber sealing strip is installed on the edge of the cover plate to prevent rainwater from seeping in. A guide slope plate is welded to the inside of the filling port to facilitate the quick filling of stones and avoid accumulation at the edge of the filling port.

[0038] Discharge port: A rectangular discharge port (size such as 200mm×300mm) is opened at the bottom of one of the side panels (100mm above the base panel). A movable door panel is installed on the outside of the discharge port. The door panel is made of 10mm thick steel plate and is fixed to the side panel by bolts or quick clamps (such as butterfly clamps). Rubber sealing gaskets are pasted on the inside of the door panel to prevent material leakage when filling with stones. When discharging, the door panel can be opened by loosening the bolts or opening the quick clamps to achieve quick emptying of stones.

[0039] 4. Anti-slip and wear-resistant components; A wear-resistant rubber pad measuring 150mm×150mm×20mm is installed at each of the four corners of the bottom of the base frame. The rubber pad is fixed to the base frame with bolts. On the one hand, it can prevent the box from scratching the surface of the platform when it is placed on the counterweight platform at the rear of the crane. On the other hand, it can increase the friction between the box and the platform and prevent the box from sliding during operation.

[0040] The assembly and folding process of this utility model is as follows: I. Assembly and Deployment (Work Site): 1. Transport the folded container to the counterweight platform at the rear of the crane. First, unfold the base frame and place it stably, ensuring that the wear-resistant rubber pad at the bottom is in full contact with the platform. 2. Unfold the four side panels one by one, and use the heavy-duty hinges to stand the side panels up. Align the L-shaped latches of the adjacent side panels, rotate the latches to engage, and insert the safety pins to complete the fixation of the box around its perimeter. 3. Unfold the top panel, connect it to one of the side panels via hinges and cover the top of the box. Then fix the top panel with the buckles on the edge of the top panel (pre-welded to the top panel and the opposite side panel) to ensure that the top panel and the side panel fit tightly together.

[0041] II. Folding and storage (completed), such as Figures 4-9 As shown: 1. Open the top panel latches and flip the top panel to one side of the side panel; 2. Pull out all safety pins, rotate the L-shaped latch to unlock the adjacent side panels, and fold the side panels that are not connected to the top panel to the bottom of the base frame in sequence. 3. Finally, fold the side panels of the top plate to the top of the base frame to form a compact sheet-like folding structure, which is convenient for transportation or storage.

[0042] The counterweight operation process of this utility model is as follows: 1. Fill with pebbles; Open the small cover of the filling port on the top plate, and fill the box with stones manually or with a small loader. During the filling process, you can judge the filling amount by observing the filling port or tapping the side plate. After reaching the target counterweight weight (such as by using a crane weighing system or estimating the stone volume, 1m³ of stones weighs about 1.6 tons), close the small cover.

[0043] 2. Used as a counterweight; The filled container is lifted by a crane to the counterweight installation platform at the rear of the crane, ensuring that the container is centered and the base frame fits tightly against the platform. The container is further secured using the platform's built-in fixing devices (such as bolts and slots) to prevent displacement during operation.

[0044] 3. Unloading and recycling; After the operation is completed, the container is hoisted to an open area, the bolts of the movable door panel or the quick clamps of the unloading port are loosened, the door panel is opened, and after all the stones in the container are unloaded, the door panel is closed, and the container is folded for transportation or storage.

[0045] The following section will provide a detailed explanation using different working conditions as examples.

[0046] 1. 25-ton truck crane for urban building construction; It requires a 5-ton counterweight and uses a folding box with a length of 1.5m, a width of 1m, and a height of 0.4m. Approximately 3.1m³ of gravel is filled on-site (1.6 tons / m³ × 3.1m³ ≈ 5 tons). The empty folding box is transported by a small truck and filled within 30 minutes, making it suitable for transportation and rapid operation in narrow urban roads.

[0047] 2. Erection of remote bridges using a 50-ton crawler crane; It requires 12 tons of counterweight and uses two sets of folding boxes, each 2m long × 1.2m wide × 0.5m high (each set is filled with 6 tons of gravel). The material is taken from the gravel pile used in bridge construction on site, eliminating the need for additional transportation of counterweight medium and solving the problem of transporting heavy counterweights in remote areas.

[0048] 3. 16-ton truck crane for rural equipment transportation; It requires 3 tons of counterweight and uses a small folding box (1.2m long × 0.8m wide × 0.3m high). It is manually filled with about 1.9m³ of gravel. The empty folding box is transported by pickup truck. It can be quickly folded and stored after the operation. It is suitable for rural roads and small-scale operation scenarios.

[0049] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A foldable box-type crane tail counterweight device, characterized in that, include: The modular folding box structure consists of 6 pieces: a base frame, 4 side panels, and a top panel. When unfolded, it forms a cuboid box with an open top. When folded, its volume can be compressed to less than 1 / 5 of its unfolded state, making it easy to transport and store. The quick-locking mechanism, including heavy-duty hinges, L-shaped latches, and safety pins, is used to secure the folded box after it is unfolded, ensuring that the box remains stable during counterweight operations. A media filling and unloading assembly includes a filling port and an unloading port, wherein the filling port is disposed on the top plate and the unloading port is disposed at the bottom of the side plate; Anti-slip and wear-resistant components: Wear-resistant rubber pads are installed at the four corners of the bottom of the base frame. The rubber pads are fixed to the base frame with bolts. On the one hand, this can prevent the box from scratching the platform surface when it is placed on the counterweight platform at the rear of the crane. On the other hand, it can increase the friction between the box and the platform and prevent the box from sliding during operation.

2. The foldable box-type crane tail counterweight device according to claim 1, characterized in that, Each of the side panels is connected to the base frame via heavy-duty hinges or hinges to ensure smooth rotation and no deformation during the unfolding and folding of the side panels.

3. A foldable box-type crane tail counterweight device according to claim 1 or 2, characterized in that, L-shaped latches are welded to the vertical edges of adjacent side panels, i.e., at the four upright positions of the box. After unfolding the side panel, rotate the L-shaped latches to engage with the latch seats of the adjacent side panels, and then insert the steel safety pins to form a double lock to prevent the side panels from loosening during operation.

4. The foldable box-type crane tail counterweight device according to claim 1, characterized in that, One or two rectangular filling openings are provided on the top plate. Each filling opening is equipped with an independent flip-up small cover plate. The cover plate is connected to the top plate by a hinge. A rubber sealing strip is installed on the edge of the cover plate to prevent rainwater from seeping in. A guide slope plate is welded to the inside of the filling opening to facilitate the rapid filling of stones and avoid accumulation at the edge of the filling opening.

5. A foldable box-type crane tail counterweight device according to claim 1 or 4, characterized in that, A rectangular discharge port is opened at the bottom of one of the side panels. A movable door panel is installed on the outside of the discharge port and is fixed to the side panel by bolts or quick clamps. A rubber sealing gasket is pasted on the inside of the door panel to prevent material leakage when filling with stones. When discharging, the door panel can be opened by loosening the bolts or opening the quick clamps to achieve rapid emptying of stones.

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