Double-beam crane for material management

Abstract

The invention relates to the field of lifting grab buckets, in particular to a double-beam crane for material management, which comprises a grab bucket assembly, the grab bucket assembly is used for grabbing materials, and the grab bucket assembly comprises a left grab bucket, a right grab bucket, a hinge frame and a connecting plate; the left grab bucket and the right grab bucket are located below the connecting plate and are symmetrically arranged with the perpendicular bisector of the front side face of the connecting plate as the symmetry axis. The inner side face of the left grab bucket is provided with the drainage hole, the side portion of the left grab bucket is provided with the mounting cavity, the movable plate is slidably connected into the mounting cavity, and the grab bucket assembly can be suitable for different working conditions by changing the position of the movable plate in the mounting cavity, so that the grab bucket assembly of the equipment is wider in application range; when the working area of the grab bucket assembly has the working condition that liquid in the materials needs to be discharged and also has the working condition that the liquid in the materials does not need to be discharged, the hydraulic grab bucket does not need to be manually replaced by adopting the grab bucket assembly in the equipment, and the operation is convenient and rapid.

Description

Technical Field

[0001] The invention relates to the technical field of lifting grab buckets, in particular to a double-beam crane used for material management. Background Art

[0002] Double girder cranes are a type of lifting equipment widely used in industrial production, construction, logistics and transportation. Their main features include high load capacity, flexible operation, good stability and suitability for a variety of working conditions. Compared with single girder cranes, double girder cranes can handle heavier loads and longer spans, making them an ideal choice for large enterprises with heavy lifting needs.

[0003] When a double-beam crane is in use, a hydraulic grab or a lifting hook will be connected to the lower end of the lifting rope, depending on the shape of the material to be lifted. For bulk materials, a hydraulic grab is usually selected, and for non-bulk materials (such as containers), a lifting hook is usually used. The hydraulic grab will also be designed differently according to the working conditions. If wet garbage or materials in water need to be drained, a hydraulic grab with drainage holes on the side will be selected. If powdered materials or liquid materials such as concrete slurry are grabbed, a hydraulic grab without drainage holes on the side will be selected. When the hydraulic grab's operating area has working conditions that require the water in the material to be drained and working conditions that do not require the water in the material to be drained, the hydraulic grab needs to be replaced manually, which is inconvenient. Summary of the invention

[0004] Based on this, it is necessary to provide a double-beam crane for material management to address the problems existing in the current lifting grab buckets, so as to solve the problem that it is inconvenient to replace the lifting grab buckets when the existing lifting grab buckets are used in different working conditions.

[0005] The above purpose is achieved through the following technical solutions: A double girder crane for material handling comprises: A grab assembly, the grab assembly includes a left grab, a right grab, an articulated frame and a connecting plate, the left grab and the right grab are located below the connecting plate and are symmetrically arranged with the vertical bisector of the front side of the connecting plate as the symmetry axis, one end of the articulated frame is articulated to a side of the left grab and the right grab that are away from each other, and the other end of the articulated frame is articulated to the connecting plate; A drainage hole is provided on the inner side of the left grab, a mounting cavity is provided on the side of the left grab, the mounting cavity is connected to the drainage hole, and a drain port is provided on the outer side of the left grab, the drain port is connected to the mounting cavity; A movable plate is slidably connected in the installation cavity, and the movable plate has a first position state and a second position state in the installation cavity; When the movable plate is in the first position, the movable plate isolates the drain port and the drain hole; When the movable plate is in the second position, the drain port is communicated with the drain hole.

[0006] In one embodiment, a rotating rod is provided on the upper part of the left grab and the right grab and on a side away from the articulated frame; A hydraulic rod is arranged at the center of the lower end of the connecting plate, and a connecting assembly is arranged between the hydraulic rod and the rotating rod; When the hydraulic rod is extended downward to the first lower limit position, the hydraulic rod drives the two rotating rods to move away from each other through the connecting assembly, so that the left grab bucket and the right grab bucket are opened.

[0007] In one embodiment, the left grab bucket and the right grab bucket have the same structure.

[0008] In one embodiment, a rotating shaft is provided on the cavity wall of the installation cavity, the rotating shaft is hinged to the lower end of the movable plate, a torsion spring is sleeved on the rotating shaft, one end of the torsion spring is fixedly connected to the movable plate, and the other end of the torsion spring is fixedly connected to the cavity wall of the installation cavity; When the hydraulic rod is in the first upper limit position, the movable plate is in the first position state, the movable plate blocks the drainage hole, the movable plate isolates the drain port and the drainage hole, and the torsion spring stores force; When the hydraulic rod is in the second upper limit position, the movable plate is in the second position state, the movable plate is misaligned with the drainage hole, the drain port is connected to the drainage hole, the contraction length of the telescopic end when the hydraulic rod is in the second upper limit position is greater than the contraction length of the telescopic end when the hydraulic rod is in the first upper limit position, and the torsion of the torsion spring is less than the torsion of the torsion spring when the movable plate is in the first position state.

[0009] In one embodiment, the connecting assembly includes a fixed block and an arc block. There are two arc blocks, and the two arc blocks are symmetrically arranged with the perpendicular bisector of the front side of the fixed block as the symmetry axis. A waist-shaped groove is opened on the front side of the arc block, and the rotating rod is slidably connected in the waist-shaped groove.

[0010] In one of the embodiments, an arc-shaped groove is provided inside the arc-shaped block, and an arc-shaped stopper is slidably connected in the arc-shaped groove. The arc-shaped stopper can slide along the arc-shaped groove, thereby pushing the rotating rod to move along the arc-shaped groove.

[0011] In one embodiment, a first oil chamber is provided inside the fixed block, the first oil chamber is communicated with the arc groove, and a first oil inlet is provided outside the fixed block, the first oil inlet is communicated with the first oil chamber.

[0012] In one of the embodiments, a reinforcing rib is provided on the articulated frame.

[0013] In one of the embodiments, the lower ends of the left grab bucket and the right grab bucket are both provided with avoidance gaps.

[0014] In one embodiment, the double-beam crane for material management also includes a double-beam frame, a crane mechanism and a rope mechanism. The crane mechanism is arranged on the double-beam frame, and the crane mechanism can move along the length direction of the double-beam frame. The rope mechanism is arranged at the lower end of the crane mechanism, and the end of the rope mechanism away from the crane mechanism is connected to the grab assembly.

[0015] The beneficial effects of the present invention are: The present invention opens a drainage hole on the inner side surface of the left grab bucket, opens an installation cavity on the side of the left grab bucket, and slides a movable plate in the installation cavity. By changing the position of the movable plate inside the installation cavity, the grab bucket assembly can be adapted to different working conditions. Therefore, the grab bucket assembly of the equipment has a wider range of applications. When the operating area of ​​the grab bucket assembly has both working conditions that require the discharge of liquid from the material and working conditions that do not require the discharge of liquid from the material, the grab bucket assembly of the equipment does not require manual replacement of the hydraulic grab bucket. It only needs to slide the movable plate in the installation cavity to adjust the position of the movable plate, and the operation is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall schematic diagram of a double-beam crane for material management of the present invention; Figure 2 It is a structural schematic diagram of a grab bucket assembly in a double-beam crane for material management according to the present invention; Figure 3 A top view of a double-beam crane for material management according to the present invention; Figure 4 for Figure 3 Middle AA section view; Figure 5 for Figure 4 Schematic diagram of the enlarged structure at C in the middle; Figure 6 for Figure 3 Middle BB section view; Figure 7 It is a schematic diagram of a first opening state of a grab bucket assembly in a double-beam crane for material management according to the present invention; Figure 8 It is a schematic diagram of a closed state of a grab bucket assembly in a double-beam crane for material management according to the present invention; Fig. 9 It is a schematic diagram of the position of an arc-shaped stopper in a double-beam crane for material management according to the present invention; Fig.10 It is a schematic diagram of a second opening state of a grab bucket assembly in a double-beam crane for material management according to the present invention; Fig.11 It is a structural schematic diagram of a left grab bucket in a double-beam crane for material management according to the present invention; Fig.12The present invention is a schematic structural diagram of a right grab bucket in a double-beam crane for material management.

[0017] in: 100. Grab assembly; 110. Left grab; 111. Avoidance gap; 120. Right grab; 130. Articulated frame; 131. Reinforcement rib plate; 140. Connecting plate; 150. Drain hole; 160. Installation cavity; 170. Drain port; 180. Movable plate; 190. Rotating shaft; 210. Rotating rod; 310. Hydraulic rod; 400. Connecting assembly; 410. Fixed block; 411. First oil chamber; 420. Arc block; 421. Waist-shaped groove; 422. Arc groove; 430. Arc stopper; 500. Double beam frame; 600. Overhead crane mechanism; 700. Rope mechanism. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0020] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0021] like Figure 1-Figure 12As shown, a double-beam crane for material management includes a grab assembly 100, which is used to grab materials. The grab assembly 100 includes a left grab 110, a right grab 120, an articulated frame 130 and a connecting plate 140. The left grab 110 and the right grab 120 are located below the connecting plate 140 and are symmetrically arranged with the vertical bisector of the front side of the connecting plate 140 as the symmetry axis. One end of the articulated frame 130 is hinged to a side of the left grab 110 and the right grab 120 that are away from each other, and the other end of the articulated frame 130 is hinged to the connecting plate 140. The inner side of the left grab 110 is provided with a Drain hole 150, an installation cavity 160 is provided on the side of the left grab 110, and the installation cavity 160 is connected to the drainage hole 150. A drain port 170 is provided on the outer side of the left grab 110, and the drain port 170 is connected to the installation cavity 160. A movable plate 180 is slidably connected in the installation cavity 160, and the movable plate 180 has a first position state and a second position state in the installation cavity 160. When the movable plate 180 is in the first position state, the movable plate 180 isolates the drain port 170 and the drainage hole 150. When the movable plate 180 is in the second position state, the drain port 170 is connected to the drainage hole 150.

[0022] If the material to be grabbed is material in water and the material needs to be separated from the solid and liquid, the staff will slide the movable plate 180 to the second position in the installation cavity 160, and then fix the position of the movable plate 180 so that the movable plate 180 stays in the second position. At this time, the drain port 170 is connected with the drainage hole 150, and the liquid in the material dug into the left grab 110 and the right grab 120 enters the installation cavity 160 through the drainage hole 150, flows through the installation cavity 160 to the location of the drain port 170, and is discharged to the outside of the left grab 110 and the right grab 120 through the drain port 170. At this time, the solid-liquid separation of the material in the left grab 110 and the right grab 120 is achieved.

[0023] If the material to be grabbed does not need solid-liquid separation, the staff will slide the movable plate 180 in the installation cavity 160 to the first position, and then fix the position of the movable plate 180 so that the movable plate 180 stays in the first position. At this time, the movable plate 180 isolates the drain port 170 and the drainage hole 150, and the materials inside the left grab bucket 110 and the right grab bucket 120 cannot enter the installation cavity 160 through the drainage hole 150. After the grab bucket assembly 100 moves to the unloading position, the left grab bucket 110 and the right grab bucket 120 are opened to pour out the materials inside.

[0024] In summary, the present invention provides a drainage hole 150 on the inner side surface of the left grab bucket 110, provides an installation cavity 160 on the side of the left grab bucket 110, and slides a movable plate 180 in the installation cavity 160. When the grab bucket assembly 100 grabs materials that do not require solid-liquid separation, the movable plate 180 is moved in the installation cavity 160 to a position where the movable plate 180 blocks the drainage hole 150. At this time, when the grab bucket assembly 100 grabs the material, the liquid or fine powder in the material will not spill out through the drainage hole 150, thereby preventing the problem of material leakage. When the grab bucket assembly 100 grabs materials that require solid-liquid separation, the movable plate 180 is moved in the installation cavity 160 to a position where the movable plate 180 does not block the drainage hole 150. At this time, when the grab bucket assembly 100 grabs the material, the liquid in the material can be discharged to the outside of the left grab bucket 110 through the drainage hole 150, thereby effectively removing the liquid in the material and realizing solid-liquid separation of the material. Therefore, the grab assembly 100 of the present equipment has a wider range of applications. When the operating area of ​​the grab assembly 100 includes both working conditions where the liquid in the material needs to be discharged and working conditions where the liquid in the material does not need to be discharged, the grab assembly 100 of the present equipment does not require manual replacement of the hydraulic grab. It only requires sliding the movable plate 180 in the installation cavity 160 to adjust the position of the movable plate 180, which is convenient and quick to operate.

[0025] It should be added that the left grab 110 and the right grab 120 have the same structure, that is, the inner side of the right grab 120 also has a drainage hole 150, the side of the right grab 120 also has an installation cavity 160, the installation cavity 160 is connected to the drainage hole 150, the outer side of the right grab 120 also has a drainage port 170, the drainage port 170 is connected to the installation cavity 160, and a movable plate 180 is slidably connected in the installation cavity 160. This arrangement is to speed up the drainage efficiency when the material needs to be separated into solid and liquid.

[0026] It is also to be noted that by providing the drainage holes 150 on the inner side surfaces of the left grab bucket 110 and the right grab bucket 120 , the problem of the drainage holes 150 being blocked can be reduced.

[0027] In a further embodiment, Figure 6-Figure 9As shown, a rotating rod 210 is provided on the upper part of the left grab 110 and the right grab 120 and on one side away from the articulated frame 130, a hydraulic rod 310 is provided at the lower end center of the connecting plate 140, and a connecting assembly 400 is provided between the hydraulic rod 310 and the rotating rod 210. When the hydraulic rod 310 is extended downward to the first lower limit position, the hydraulic rod 310 drives the two rotating rods 210 to move away from each other through the connecting assembly 400, so that the left grab 110 and the right grab 120 are opened, and a rotating shaft 190 is provided on the cavity wall of the installation cavity 160, and the rotating shaft 190 is hinged to the lower end of the movable plate 180, and a torsion spring is sleeved on the rotating shaft, one end of the torsion spring is fixedly connected to the movable plate 180, and the other end of the torsion spring is fixedly connected to the installation cavity 160. On the cavity wall of the cavity 160, when the hydraulic rod 310 is in the first upper limit position, the movable plate 180 is in the first position state, the torsion spring is in the force storage state, the movable plate 180 blocks the drainage hole 150, and the movable plate 180 isolates the drainage port 170 and the drainage hole 150. When the hydraulic rod 310 is in the second upper limit position, the movable plate 180 is in the second position state, the movable plate 180 is misaligned with the drainage hole 150, and the drainage port 170 is connected with the drainage hole 150. When the hydraulic rod 310 is in the second upper limit position, the contraction length of the telescopic end is greater than the contraction length of the telescopic end when the hydraulic rod 310 is in the first upper limit position. At this time, the torsion force of the torsion spring is less than the torsion force of the torsion spring when the movable plate 180 is in the first position state.

[0028] When it is necessary to grab materials, the left grab bucket 110 and the right grab bucket 120 need to be moved from Figure 6 The displayed status switches to Figure 7 In the state shown, the telescopic end of the hydraulic rod 310 is extended, and the telescopic end of the hydraulic rod 310 pushes the rotating rod 210 through the connecting assembly 400, so that the left grab 110 rotates clockwise with the rotating rod 210 fixedly connected thereto as the axis, and the right grab 120 rotates counterclockwise with the rotating rod 210 fixedly connected thereto as the axis, so that the left grab 110 and the right grab 120 rotate from Figure 6 The closed state shown opens to Figure 7 In the open state shown in FIG. 1 , the left grab bucket 110 and the right grab bucket 120 are driven to move vertically downward to load the materials into the left grab bucket 110 and the right grab bucket 120. After the materials are loaded into the left grab bucket 110 and the right grab bucket 120, if the materials do not need to be separated into solid and liquid, the telescopic end of the hydraulic rod 310 is retracted upward to move to the first upper limit position. At this time, the position of the movable plate 180 is as shown in FIG. Figure 6As shown, under the torsion force of the torsion spring, the two movable plates 180 abut against each other and the movable plate 180 blocks the drainage hole 150, and the materials inside the left grab bucket 110 and the right grab bucket 120 will not spill out through the drainage hole 150. If the materials need to be separated into solid and liquid, the telescopic end of the hydraulic rod 310 is retracted and moved upward to the second upper limit position. At this time, the positions of the movable plate 180 and the left grab bucket 110 and the movable plate 180 and the right grab bucket 120 are as shown in FIG. Figure 8 As shown, at this time, the torsion force of the torsion spring is reduced, the movable plate 180 and the drainage hole 150 are misaligned, the drainage port 170 and the drainage hole 150 are connected, and the liquid in the material inside the left grab 110 and the right grab 120 can be discharged into the installation cavity 160 through the drainage hole 150, and then discharged through the installation cavity 160 to the location of the drainage port 170, and finally discharged to the outside of the left grab 110 and the right grab 120 through the drainage port 170.

[0029] It should be added that if Figure 6 As shown, the lower ends of the left grab 110 and the right grab 120 are both provided with an avoidance gap 111, and the avoidance gap 111 is provided to prevent interference between the contact points of the left grab 110 and the right grab 120 when the hydraulic rod 310 continues to move upward from the first upper limit position to the second upper limit position.

[0030] In a further embodiment, Figure 4 and Figure 5 As shown, the connecting component 400 includes a fixed block 410 and an arc block 420. There are two arc blocks 420. The two arc blocks 420 are symmetrically arranged with the vertical bisector of the front side of the fixed block 410 as the symmetry axis. A waist-shaped groove 421 is opened on the front side of the arc block 420, and the rotating rod 210 is slidably connected in the waist-shaped groove 421.

[0031] When grabbing materials, the left grab bucket 110 and the right grab bucket 120 need to be opened. Specifically, the telescopic end of the hydraulic rod 310 is extended, and the telescopic end of the hydraulic rod 310 drives the fixed block 410 to move downward, and the fixed block 410 drives the arc block 420 to move downward, and the arc block 420 drives the rotating rod 210 to move downward through the waist groove 421 and makes the rotating rod 210 slide along the waist groove 421 toward the tail of the waist groove 421, so that the left grab bucket 110 rotates clockwise around the rotating rod 210 thereon to Figure 7 In the state shown, the right grab bucket 120 rotates counterclockwise around the rotating rod 210 thereon to Figure 7When the left grab bucket 110 and the right grab bucket 120 need to be closed, the telescopic end of the hydraulic rod 310 contracts and moves, and the telescopic end of the hydraulic rod 310 drives the fixed block 410 to move upward, and the fixed block 410 drives the arc block 420 to move upward, and the arc block 420 drives the rotating rod 210 to move upward through the waist groove 421, and at the same time, the rotating rod 210 returns to the position along the waist groove 421. Figure 5 Status shown.

[0032] When the materials in the left grab bucket 110 and the right grab bucket 120 need to be poured out, if the left grab bucket 110 and the right grab bucket 120 are still opened to Figure 7 In the state shown, the two movable plates 180 are in contact with each other, and materials are easily sandwiched between the two movable plates 180. Therefore, in order to ensure that the materials inside the left grab bucket 110 and the right grab bucket 120 can be completely poured out, it is necessary to ensure that the two movable plates 180 do not contact each other when the left grab bucket 110 and the right grab bucket 120 are opened. To achieve the above purpose, in a further embodiment, as Figure 7 and Fig.10 As shown, an arc-shaped groove 422 is provided inside the arc-shaped block 420 , and an arc-shaped stopper 430 is slidably connected in the arc-shaped groove 422 . The arc-shaped stopper 430 can slide along the arc-shaped groove 422 , thereby pushing the rotating rod 210 to move along the arc-shaped groove 422 .

[0033] The left grab bucket 110 and the right grab bucket 120 are opened to Figure 7 After the state shown, the arc block 430 moves along the arc groove 422 toward the tail of the waist groove 421. At this time, the arc block 430 pushes the rotating rod 210 to move synchronously toward the tail of the waist groove 421, so that the left grab 110 and the right grab 120 move to Fig.10 In the state shown, the two rotating rods 210 are both located at the tail end of the waist-shaped groove 421, and there is a large distance between the left grab bucket 110 and the right grab bucket 120. At this time, even if the torsion force of the torsion spring is fully released, the two movable plates 180 cannot contact each other, so no material will be clamped between the two movable plates 180.

[0034] When the left grab bucket 110 and the right grab bucket 120 are in Figure 8 In the state shown, the left grab 110 and the right grab 120 are unfolded at a negative angle, at which time the material can be unfolded as much as possible, reducing the height of the material inside the left grab 110 and the right grab 120, and preventing the material from flowing out of the left grab 110 and the right grab 120. At this time, the left grab 110 and the right grab 120 are unfolded at a negative angle, which is also beneficial to discharge the liquid inside the installation cavity 160, avoiding liquid accumulation inside the installation cavity 160.

[0035] In a further embodiment, Fig. 9As shown, a first oil chamber 411 is provided inside the fixed block 410 , and the first oil chamber 411 is communicated with the arc groove 422 . A first oil inlet is provided outside the fixed block 410 , and the first oil inlet is communicated with the first oil chamber 411 .

[0036] When the arc block 430 needs to move along the arc groove 422 toward the tail of the waist groove 421, oil is injected into the first oil chamber 411 through the first oil inlet, and the hydraulic oil enters the arc groove 422 through the first oil chamber 411, pushing the arc block 430 to move toward the tail of the waist groove 421. When the arc block 430 needs to be reset and moved to a position close to the first oil chamber 411, oil is pumped out through the first oil inlet, and the hydraulic oil in the arc groove 422 is pumped out through the first oil chamber 411. At this time, under the action of negative pressure, the arc block 430 gradually moves along the arc groove 422 to one end of the arc groove 422 close to the first oil chamber 411.

[0037] In a further embodiment, Figure 2 As shown, a reinforcing rib plate 131 is provided on the articulated frame 130. The reinforcing rib plate 131 is provided to prevent the articulated frame 130 from being broken due to excessive force.

[0038] In a further embodiment, Figure 1 As shown, the double-beam crane for material management also includes a double-beam frame 500, a crane mechanism 600 and a rope mechanism 700. The crane mechanism 600 is arranged on the double-beam frame 500, and the crane mechanism 600 can move along the length direction of the double-beam frame 500. The rope mechanism 700 is arranged at the lower end of the crane mechanism 600, and the end of the rope mechanism 700 away from the crane mechanism 600 is connected to the grab assembly 100.

[0039] When the grab bucket assembly 100 needs to move, the overhead crane mechanism 600 drives the rope mechanism 700 to move, and the rope mechanism 700 drives the grab bucket assembly 100 to move, so that the grab bucket assembly 100 moves to a desired position.

[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A double-beam crane for material management, characterized in that: include: A grab assembly, the grab assembly includes a left grab, a right grab, an articulated frame and a connecting plate, the left grab and the right grab are located below the connecting plate and are symmetrically arranged with the vertical bisector of the front side of the connecting plate as the symmetry axis, one end of the articulated frame is articulated to a side of the left grab and the right grab that are away from each other, and the other end of the articulated frame is articulated to the connecting plate; A drainage hole is provided on the inner side of the left grab, a mounting cavity is provided on the side of the left grab, the mounting cavity is connected to the drainage hole, and a drain port is provided on the outer side of the left grab, the drain port is connected to the mounting cavity; A movable plate is slidably connected in the installation cavity, and the movable plate has a first position state and a second position state in the installation cavity; When the movable plate is in the first position, the movable plate isolates the drain port and the drain hole; When the movable plate is in the second position, the drain port is communicated with the drain hole.

2. A double-beam crane for material management according to claim 1, characterized in that: A rotating rod is provided on the upper part of the left grab and the right grab and on a side away from the articulated frame; A hydraulic rod is arranged at the center of the lower end of the connecting plate, and a connecting assembly is arranged between the hydraulic rod and the rotating rod; When the hydraulic rod is extended downward to the first lower limit position, the hydraulic rod drives the two rotating rods to move away from each other through the connecting assembly, so that the left grab bucket and the right grab bucket are opened.

3. A double-beam crane for material management according to claim 2, characterized in that: The left grab bucket and the right grab bucket have the same structure.

4. A double-beam crane for material management according to claim 2, characterized in that: A rotating shaft is provided on the cavity wall of the installation cavity, the rotating shaft is hinged to the lower end of the movable plate, a torsion spring is sleeved on the rotating shaft, one end of the torsion spring is fixedly connected to the movable plate, and the other end of the torsion spring is fixedly connected to the cavity wall of the installation cavity; When the hydraulic rod is in the first upper limit position, the movable plate is in the first position state, the movable plate blocks the drainage hole, the movable plate isolates the drain port and the drainage hole, and the torsion spring stores force; When the hydraulic rod is in the second upper limit position, the movable plate is in the second position state, the movable plate is misaligned with the drainage hole, the drain port is connected to the drainage hole, the contraction length of the telescopic end when the hydraulic rod is in the second upper limit position is greater than the contraction length of the telescopic end when the hydraulic rod is in the first upper limit position, and the torsion of the torsion spring is less than the torsion of the torsion spring when the movable plate is in the first position state.

5. A double-beam crane for material management according to claim 2, characterized in that: The connecting assembly includes a fixed block and an arc block. There are two arc blocks, which are symmetrically arranged with the vertical bisector of the front side of the fixed block as the symmetry axis. A waist-shaped groove is opened on the front side of the arc block, and the rotating rod is slidably connected in the waist-shaped groove.

6. A double-beam crane for material management according to claim 5, characterized in that: An arc-shaped groove is provided inside the arc-shaped block, and an arc-shaped stopper is slidably connected in the arc-shaped groove. The arc-shaped stopper can slide along the arc-shaped groove, thereby pushing the rotating rod to move along the arc-shaped groove.

7. A double-beam crane for material management according to claim 6, characterized in that: A first oil cavity is provided inside the fixed block and is communicated with the arc groove. A first oil inlet is provided outside the fixed block and is communicated with the first oil cavity.

8. A double-beam crane for material management according to claim 1, characterized in that: The hinged frame is provided with a reinforcing rib plate.

9. A double-beam crane for material management according to claim 1, characterized in that: The lower ends of the left grab bucket and the right grab bucket are both provided with avoidance gaps.

10. A double-beam crane for material management according to claim 1, characterized in that: The double-beam crane for material management also includes a double-beam frame, a crane mechanism and a rope mechanism. The crane mechanism is arranged on the double-beam frame and can move along the length direction of the double-beam frame. The rope mechanism is arranged at the lower end of the crane mechanism, and the end of the rope mechanism away from the crane mechanism is connected to the grab bucket assembly.

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