Hoisting device and hoisting method for casting production

Abstract

The invention discloses a hoisting device and method for casting production. The hoisting device comprises a hoisting plate, two clamping pincers and an automatic telescopic piece, and two sets of inserting claws are arranged at the bottoms of the two clamping pincers in a staggered mode; two pulleys are connected below the lifting plate in a left-right sliding mode, the top ends of the clamping pincers are each fixedly connected with a set of lifting ropes, and the two sets of lifting ropes are crossed, then bypass the pulleys in the opposite side directions and are connected with the inserting claws; a rectangular ring is arranged at the crossed position of the lifting ropes, the upper end of the rectangular ring is connected with an automatic telescopic piece, a rhombic four-bar linkage is hinged to the lower end of the rectangular ring, and the left and right sides of the rhombic four-bar linkage are hinged to power arms of the clamping pincers; through the arrangement of the automatic telescopic piece, the lifting plate, the clamping pincers, the pulley, the inserting claw, the rectangular ring and the lifting rope, the automatic telescopic piece stretches out and draws back up and down, the two clamping pincers can be driven to be opened or closed through the rhombic four-bar linkage, and therefore a casting is automatically clamped or released, and time and labor are saved; in addition, through coordination and cooperation of a lifting rope, a rhombic four-bar linkage and an inserting claw, the clamping effect on the casting is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of hoisting, and in particular relates to a hoisting device and a hoisting method for casting production. Background Art

[0002] When castings are produced and processed in a workshop, a hoisting device is used to hoist the castings and transfer them from one process to another.

[0003] For hoisting devices, in the prior art, after retrieval, a Chinese invention patent with the publication number CN117819370B discloses a casting hoisting device, which mainly includes a lifting arm. Two four-link-shaped upper pulling arms are rotatably connected below the lifting arm. Two cross-set clamping pliers are connected between the two upper pulling arms. The two clamping pliers are rotatably connected through a shaft rod. The clamping pliers include an arc-shaped clamping part below and a driving arm above. The arc-shaped openings of the arc-shaped clamping parts of the clamping pliers are arranged oppositely. In addition, it also includes a pressing part, which is rotatably connected to the hinge shaft at the bottom end of the upper pulling arm, and the pressing part can slide up and down in the vertical direction relative to the second shaft rod.

[0004] During hoisting, the casting is placed in the arc-shaped clamping parts of the two clamping pliers, and then the casting can be hoisted and transferred.

[0005] In the prior art, for hoisting devices similar to the above technical solutions, during actual implementation, it is found that there are certain defects: because there is no mutual pulling and fastening between the bottoms of the two arc-shaped clamping parts of the two clamping pliers, when hoisting a casting, if the casting is heavy or the casting size is large, the bottoms of the clamping pliers are easily opened under the pressing of the casting, which easily causes the casting to slide and affects the hoisting safety; in addition, during hoisting, the clamping pliers cannot be automatically opened to hold or release the casting, which is relatively laborious. Summary of the Invention

[0006] In view of the deficiencies and defects existing in the prior art, the purpose of the present invention is to provide a hoisting device and a hoisting method for casting production, which solve the problems existing in the casting hoisting device in the prior art that when hoisting a casting, if the casting is heavy or the casting size is large, the bottoms of the clamping pliers are easily opened under the pressing of the casting, which easily causes the casting to slide and affects the hoisting safety; and the problem that during hoisting, the clamping pliers cannot be automatically opened to hold or release the casting, which is relatively laborious.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions: A hoisting device for casting production, comprising two clamping pliers arranged crosswise. The clamping pliers include an arc-shaped clamping portion at the lower part and a power arm at the upper part. The middle parts of the two clamping pliers are rotatably connected through a rotating shaft. Two groups of inserting claws are correspondingly arranged at the bottoms of the two clamping pliers in an interlaced manner. When the two clamping pliers are closed, the two groups of inserting claws can be inserted crosswise with each other; It includes a lifting plate. Two pulleys are slidably connected to the left and right below the lifting plate. One set of lifting ropes is fixedly connected to the top end of each of the two clamping pliers. After the two sets of lifting ropes cross, they respectively bypass the pulleys in the opposite direction and are detachably connected to the inserting claws inserted from below; It includes an automatic telescopic member. At the crossing position of the two sets of lifting ropes, there is a rectangular ring that can surround the two sets of lifting ropes. The upper end of the rectangular ring is connected to the automatic telescopic member through an up-and-down sliding member. The lower end of the rectangular ring is hinged with a rhombic four-link rod. The bottom vertex of the rhombic four-link rod is connected with a pressing rod. An opening through which the pressing rod can pass is opened in the middle part of the clamping pliers. The vertices on the left and right sides of the rhombic four-link rod are respectively hinged with the power arms of the two clamping pliers; One protective rope is fixed to each of the front and rear sides of the rectangular ring. The two protective ropes are respectively detachably connected to the front and rear sides of the bottom of the clamping pliers.

[0008] As a further improvement of the present invention, outer air bags are arranged on the outer sides of the arc-shaped clamping portions of the two clamping pliers, inner air bags are arranged on the inner sides of the arc-shaped clamping portions, air channels connecting the inner air bags and the outer air bags are arranged inside the arc-shaped clamping portions, and a plurality of air columns are arranged on the inner side surface of the inner air bag, and the air columns are communicated with the inner air bag.

[0009] As a further improvement of the present invention, the inner side of the outer air bag is adhesively attached to the outer arc surface of the arc-shaped clamping portion, and shaping keels are arranged on the outer side surface of the outer air bag.

[0010] As a further improvement of the present invention, the up-and-down sliding member includes a sliding shaft. A vertical sliding groove is arranged at the bottom end of the automatic telescopic member. The sliding shaft is slidably connected with the vertical sliding groove up and down, and the bottom end of the sliding shaft is fixedly connected with the rectangular ring.

[0011] As a further improvement of the present invention, two left-and-right transverse sliding grooves are arranged at the front and back of the lower part of the lifting plate. Two sliders are slidably connected in each transverse sliding groove. The pulley is rotatably connected between the two sliders corresponding to the front and back.

[0012] As a further improvement of the present invention, the rhombic four-link rod includes four rods, and the four rods are connected end to end in sequence and are all connected through hinge shafts at the connection points.

[0013] As a further improvement of the present invention, it further includes four U-shaped connecting seats. The bottom of the rectangular ring, the inner sides of the two power arms, and the top of the pressing rod are all fixedly connected with the connecting seats, and the connecting seats are hinged to the rhombic four-link through the hinge shafts at the connection points of the rods.

[0014] As a further improvement of the present invention, each group of lifting ropes includes a plurality of hanging ropes. The plurality of hanging ropes are arranged in parallel, and the hanging ropes of each group of lifting ropes are connected by connecting ropes.

[0015] A lifting method using a lifting device for casting production for lifting: includes the following steps: (1) Hang the lifting plate on the crane, move the lifting plate above the casting, the automatic telescopic member extends downward and drives the rectangular ring to move downward. After the rectangular ring moves downward, it drives the rhombic four-link to be compressed downward and expand to the left and right sides at the same time. After the left and right sides of the rhombic four-link expand outward, it drives the two clamping pliers to open to the limit position; then move the clamping pliers downward so that both sides of the arc-shaped clamping portion cover the outside of the casting; The automatic telescopic member retracts upward and drives the rectangular ring to move upward. After the rectangular ring moves upward, it drives the rhombic four-link to expand up and down and compress inward on the left and right sides at the same time, and then makes the pressing rod move downward to press the casting; at the same time, makes the two clamping pliers close to tightly hold the casting; (2) Connect the bottoms of the two groups of lifting ropes to the plug grippers. After connection, the lifting rope on one clamping plier bypasses the pulley and is connected to the plug gripper of the other clamping plier; (3) Connect the lower ends of the two protective ropes to the front and rear sides of the bottom of the clamping plier respectively. After connection, make the protective ropes in a tensioned state; (4) Lift the lifting plate upward and transfer the casting by lifting; during this process, the gravity of the casting makes the lifting ropes further tensioned. After the lifting ropes are tensioned, they generate a clamping torsional tension on the clamping pliers, driving the clamping pliers to close inward or have a tendency to close inward, and at the same time driving the pressing rod to move downward or have a tendency to move downward to press the casting; (5) After lifting the casting to the target position, untie the protective ropes and the lifting ropes, the automatic telescopic member extends downward, drives the rhombic four-link to open the arc-shaped clamping pliers, and puts down the casting.

[0016] As a further improvement of the present invention, when lifting to the sand removal area of the casting, between step (4) and step (5), it further includes the following steps: during the process of high-pressure water spraying and sand removal of the casting, the automatic telescopic member continuously extends and retracts up and down, making the clamping pliers continuously hold and release, so that the casting shakes in the clamping pliers; after sand removal is completed, the automatic telescopic member retracts upward, drives the clamping pliers to hold the casting tightly, and then transfers the casting by lifting.

[0017] Compared with the prior art, the present invention has the following advantages: 1. By setting an automatic telescopic member, a lifting plate, and two intersecting clamping pliers, two pulleys are slidably provided at the bottom of the lifting plate, and two groups of inserting claws are correspondingly arranged at the bottom of the two clamping pliers in an alternating manner. One end of each of the two clamping pliers is fixedly connected to a set of lifting ropes. After the lifting ropes intersect, they respectively bypass the pulleys in the opposite direction and are detachably connected to the inserting claws inserted from below. A rectangular ring is provided at the intersection of the middle parts of the lifting ropes. The lower end of the rectangular ring is hinged to a rhombic four-link mechanism. The two sides of the rhombic four-link mechanism are connected to the clamping pliers, and a pressing rod is provided at the bottom of the rhombic four-link mechanism; Therefore, during hoisting, when the automatic telescopic member is started and extends downward, the automatic telescopic member causes the rhombic four-link mechanism to be compressed inward in the vertical direction and expand outward in the horizontal direction, thereby driving the clamping pliers to open outward so as to open and grasp the casting or lower the casting; when the automatic telescopic member retracts upward, the automatic telescopic member causes the rhombic four-link mechanism to be compressed inward in the horizontal direction and expand outward in the vertical direction, thereby driving the clamping pliers to close inward and automatically clamp the casting. That is, through the telescoping of the automatic telescopic member, the clamping pliers can be driven to open or close, thereby automatically clamping or releasing the casting, which is more time-saving, labor-saving and convenient; In addition, through the cooperative setting of the rhombic four-link mechanism, the lifting ropes, the pressing rod and the rectangular ring, after the casting is lifted, the gravity of the casting will exert a pulling force on the lifting ropes. This force causes the lifting ropes to be tensioned. After the lifting ropes are further tensioned, the upper ends of the lifting ropes cause the power arms of the clamping pliers to twist inward, and the lower ends of the lifting ropes cause the inserting claws to twist in the opposite direction, so that the two clamping pliers can better close relatively. Moreover, the greater the gravity of the casting, the greater the tension of the lifting ropes, and the greater the pulling force of the lifting ropes on the two ends of the clamping pliers to close inward, ensuring the clamping effect and avoiding the weakening of the clamping effect caused by the increase in the gravity of the casting; on the other hand, after the lifting ropes are further tensioned, the lifting ropes will press inward on the arc-shaped clamping part, preventing the arc-shaped clamping part from deforming or loosening outward to a certain extent and ensuring the clamping effect; in summary, while the clamping pliers further tighten, the rhombic four-link mechanism is compressed in the left, right and up directions, thereby driving the rhombic four-link mechanism to stretch up and down. After the bottom vertex of the rhombic four-link mechanism stretches downward, it then pushes the pressing rod to move downward to better press the casting. At the same time, after the top vertex of the rhombic four-link mechanism stretches upward, it pushes the rectangular ring to move upward and makes the intersection point of the two groups of lifting ropes move upward, thereby increasing the wrap angle of the lifting ropes at the rectangular ring, making the lifting ropes further tensioned, preventing the clamping pliers from loosening, and better clamping and holding the casting. The above-mentioned coordinated cooperation of the lifting ropes and the rhombic four-link mechanism improves the fastening effect on the casting in multiple aspects and prevents the casting from falling off.

[0018] In addition, the insertion and grasping of the clamping pliers are arranged such that the bottoms of the two clamping pliers cross each other and are pulled by the lifting ropes, preventing the bottoms of the clamping pliers from loosening. The insertion depth can be adjusted according to the size of the casting, enabling it to tightly hold castings of different sizes and greatly improving the clamping effect on castings of different sizes. Moreover, the lifting ropes and the clamping pliers are cross-connected separately, further forming a closed loop for the clamping of the clamping pliers. When the size of the casting is large and the insertion and grasping parts of the two clamping pliers cannot cross each other, the supporting effect at the bottom of the lifting ropes also keeps the clamping area in a closed-loop state, ensuring the clamping and protective effect on the casting and preventing the casting from slipping. In addition, the lifting ropes and the clamping pliers cross and connect with each other, that is, the two clamping pliers are respectively connected to each other through the lifting ropes (both ends of each group of lifting ropes are respectively connected to the two clamping pliers). When the weights on the left and right sides of the casting are different, through the force transmission of the lifting ropes, the force will be transmitted to the clamping pliers on the other side, balancing the instability caused by different weights on the left and right sides of the casting to a certain extent and making the lifting of the casting more stable.

[0019] In addition, under the pulling effect of the gravity of the casting, the lifting ropes can tightly hold and combine the two arc-shaped clamping parts, avoiding or reducing the deformation or opening of the arc-shaped clamping parts under the downward pressure of the casting, thereby preventing the casting from enlarging the opening of the arc-shaped clamping parts and causing the casting to slip. In addition, with the setting of the lifting ropes, when lifting a casting with a larger size, such as when the size of the casting is larger than that of the arc-shaped clamping parts, the insertion and grasping parts at the bottom of the arc-shaped clamping parts cannot be inserted together, forming an opening. At this time, the lifting ropes drag at the bottom of the arc-shaped clamping parts, which can support the bottom of the casting, prevent the casting from slipping and falling, ensure the smooth progress of the lifting, and improve safety.

[0020] In addition, the setting of the guard ropes can protect the casting on both the front and back sides of the clamping pliers, enabling the casting to be protected from multiple angles, preventing the casting from slipping from the front and back ends, improving the protection effect on the casting, and enhancing the safety of the lifting.

[0021] 2. By arranging an outer air bag on the outer side of the arc-shaped clamping part of the clamping pliers and an inner air bag on the inner side, and arranging multiple air columns on the inner side of the inner air bag, on the one hand, the soft effect of the outer air bag can provide anti-collision protection for the clamping pliers and improve the safety of the lifting; the soft effect of the inner air bag can protect the casting and reduce the damage to the surface of the casting during clamping. On the other hand, during lifting, the lifting ropes will tighten the outer air bag, and the outer air bag is compressed, causing the gas to enter the inner air bag, thereby making the inner air bag and the air columns expand, further pressing the casting tightly and improving the clamping effect on the casting. When clamping the casting, due to the reverse pressure of the casting on the air columns and the inner air bag, the air columns and the inner air bag are compressed, causing the gas to enter the inner air bag, which can play a certain role in tensioning the lifting ropes, increasing the clamping force of the clamping pliers for holding and combining, and finally forming a balance with each other to ensure the clamping effect on the casting.

[0022] In addition, the deformation of the internal air bag and the multiple air columns can wrap the casting. Especially when clamping a casting with an irregular surface, the air columns can better fit the irregular surface of the casting to a greater extent, improving the clamping effect.

[0023] In addition, the arrangement of the air columns on the internal air bag forms an uneven and non-smooth surface as a whole, improving the anti-slip effect and the anti-slip clamping effect on the casting. Moreover, when high-pressure water spraying is used to remove sand (removing the mold sand adhering to the surface of the casting) from the casting during hoisting, the high-pressure water can flow in from the gaps between the air columns and then enter the inside of the outer surface of the casting, which also facilitates the high-pressure water to flow out from the inside to carry out the mold sand, facilitating the removal of the mold sand on the surface of the casting. In addition, the deformation characteristics of the air columns, the internal air bag and the external air bag help the casting to shake when the clamping pliers are continuously opened and closed slightly, facilitating the removal of the mold sand.

[0024] In addition, the arrangement of the internal air bag and the external air bag. When hoisting a just-demolded casting, the heat on the casting will be transferred to the air columns, the internal air bag and the external air bag, causing the air columns, the internal air bag and the external air bag to expand due to heat, so as to clamp the casting more tightly and make reasonable use of the heat of the casting.

[0025] 3. By adhesively attaching the outer air bag to the outer arc surface of the arc-shaped clamping part on the inner side, and a shaping keel is provided on the outer side surface of the outer air bag. The function of the shaping keel makes the outer side surface of the outer air bag relatively stiff as a whole. When the lifting rope tightly pulls the outer air bag inward, it is convenient for the outer side surface of the outer air bag to be compressed inward as a whole, and then the compression effect of the outer air bag is ensured, so as to promote the expansion of the internal air bag to press the casting tightly, preventing the problem of insufficient compression caused by the compression only at the position where the outer air bag contacts the lifting rope.

[0026] 4. By providing a vertical sliding groove at the bottom of the automatic telescopic member, and a sliding shaft is slidably arranged in the vertical sliding groove. Therefore, the rectangular ring can slide freely relative to the automatic telescopic member to a certain extent. Therefore, on the one hand, when the automatic telescopic member has adjusted the telescopic length, after hoisting, under the action of the gravity of the casting, the casting has a certain downward dragging displacement on the clamping pliers, causing the clamping pliers to close further, improving the clamping effect on the casting; on the other hand, when high-pressure water spraying is used to remove the mold sand on the surface of the casting, it is necessary to continuously open and close the clamping pliers to shake the casting, and during the shaking interval, the mold sand on the surface of the casting flows out. At this time, the free sliding of the sliding shaft can improve the shaking effect on the casting, further promoting the removal of the mold sand on the surface of the casting.

[0027] 5. By arranging a horizontal sliding groove on the lifting plate, a slider is slidably arranged in the horizontal sliding groove, and a pulley is rotatably connected between two sliders corresponding to the front and back. Therefore, after lifting the casting, under the action of the gravity of the casting, the slider is driven to move and adjust through the lifting rope. After adjustment, the outer side of the lifting rope basically reaches a relatively natural vertical state, which is convenient for the lifting rope to play a certain tightening role on the clamping pliers, so that the clamping pliers can better clamp the casting.

[0028] 6. By arranging a rhombic four-link mechanism and setting the rhombic four-link mechanism as a rod hinged at the head and tail, due to the deformation effect of the rhombic four-link mechanism, when the automatic telescopic part expands and contracts, it can drive the upper and lower vertices and the left and right vertices of the rhombic four-link mechanism to move simultaneously, so that the movement in one direction is converted into the movement in two directions, thus generating various functions to better clamp the casting. In addition, the self-deformable characteristic of the rhombic four-link mechanism can enable the gravity of the casting to be converted into the clamping force of the clamping pliers through the lifting rope to improve the clamping effect on the casting.

[0029] 7. By arranging the lifting ropes as multiple hanging ropes, the multiple hanging ropes are arranged in parallel, and the hanging ropes of each group of lifting ropes are connected through connecting ropes, so that the multiple hanging ropes form a whole to improve the stability.

[0030] 8. By using a hoisting method for hoisting with a hoisting device for casting production, the casting can be automatically clamped or released, which is simple and convenient, and avoids the problems of laboriousness and inconvenience caused by lifting the casting and placing it in the clamping pliers and manually pulling the clamping pliers in the prior art.

[0031] 9. When removing the sand from the casting, the automatic telescopic part expands and contracts back and forth, so that the clamping pliers open and close within a small range, which helps the casting to shake. At the moment when the casting shakes or sways, it is convenient for a small gap to be generated between the casting and the clamping pliers, so that high-pressure water can enter the inside to facilitate the removal of the molding sand of the casting. The hoisting device is reasonably utilized to remove the sand from the casting, preventing the problem that the hoisting device in the prior art needs to put down the casting when removing the sand and then needs to clamp the casting again after the sand removal is completed, resulting in more troublesome operation. Brief Description of the Drawings

[0032] The present invention will be further described below with reference to the drawings: Figure 1 It is a structural schematic diagram of the present invention Figure 1 ; Figure 2 It is a structural schematic diagram of the present invention Figure 2 ; Figure 3 It is a structural schematic diagram of the present invention Figure 3 ; Figure 4 is Figure 1 an enlarged view at A; Figure 5 Schematic diagram of the partial cross-sectional structure at the up-and-down sliding member; Figure 6 Schematic diagram of the structure at the external ventilation bag; Figure 7 For Figure 2 Enlarged view at B; In the figure: 1, clamping pliers; 101, arc-shaped clamping part; 102, power arm; 103, inserting claw; 104, hanging ring; 2, rotating shaft; 3, lifting plate; 4, pulley; 5, lifting rope; 501, hanging rope; 502, connecting rope; 6, automatic telescopic member; 7, rectangular ring; 8, up-and-down sliding member; 801, sliding shaft; 802, vertical sliding groove; 9, rhombic four-link; 901, rod member; 902, hinge shaft; 903, connecting seat; 10, pressing rod; 11, opening; 12, rope guard; 13, external ventilation bag; 14, internal ventilation bag; 15, air column; 16, shaping keel; 17, hanging ring; 18, slider; 19, horizontal sliding groove; 20, inserting hole; 21, hanging buckle. Specific embodiments

[0033] The following is a further detailed description of the present invention in conjunction with the attached Figure 1-7 For a clearer illustration, only the structures related to the inventive points of the present invention are shown in the figure.

[0034] For the convenience of description, a coordinate system is now defined as Figure 1 shown, and the left-right direction is the transverse direction, the front-back direction is the longitudinal direction, and the up-down direction is the vertical direction.

[0035] An embodiment of the present invention discloses a lifting device for casting production. Referring to Figure 1 、 Figure 2 and Figure 3 , a lifting device for casting production includes two clamping pliers 1 arranged crosswise. The clamping pliers 1 include an arc-shaped clamping part 101 at the lower part and a power arm 102 at the upper part. The arc-shaped clamping part 101 and the power arm 102 are integrally made. The arc-shaped clamping part 101 is arc-shaped, and the two arc-shaped clamping parts 101 are arranged oppositely. The middle parts of the two clamping pliers 1 are rotatably connected through a rotating shaft 2. When the clamping pliers 1 are arranged crosswise, an inserting hole 20 is formed in the middle part of one clamping plier 1 to enable the other clamping plier 1 to pass through. The arc-shaped openings of the arc-shaped clamping parts 101 of the two clamping pliers 1 are arranged oppositely. In addition, two groups of inserting claws 103 are correspondingly arranged at the bottoms of the two clamping pliers 1 in an alternating manner, that is, a group of inserting claws 103 is arranged at the bottom of each clamping plier 1. When the two clamping pliers 1 are closed, the two groups of inserting claws 103 can be inserted crosswise with each other; It further includes a lifting plate 3. Two hanging rings 17 are fixed on the upper part of the lifting plate 3 and can be hung on a crane or a hoisting machine. Two pulleys 4 are slidably connected to the lower part of the lifting plate 3. Specifically, asFigure 2 As shown in the figure, two horizontal sliding grooves 19 running left and right are provided at the front and rear of the lower part of the lifting plate 3. The cross-sectional shape of the horizontal sliding groove 19 is T-shaped. Two sliders 18 are slidably connected in each horizontal sliding groove 19. A pulley 4 is rotatably connected between the two sliders 18 corresponding to the front and rear, that is, the pulley 4 is rotatably connected to the slider 18.

[0036] As Figure 1 , Figure 2 and Figure 7 shown in the figure, a set of lifting ropes 5 are fixedly connected to the top of each of the two clamping pliers 1. After the two sets of lifting ropes 5 cross, they respectively bypass the pulleys 4 in the opposite direction and are detachably connected to the inserted grippers 103 below. Specifically, a hanging ring 104 can be fixed at the end of the gripper 103, and the lifting rope 5 can be tied to the hanging ring 104 or hung on the hanging ring 104 through a hook. The cross-connection method of the lifting rope 5 specifically means that the upper end of one clamping plier 1 is connected to the gripper 103 at the bottom end of the other clamping plier 1 through the lifting rope 5. For the lifting rope 5, each set of lifting ropes 5 includes a plurality of hanging ropes 501. The plurality of hanging ropes 501 are arranged in parallel, and the hanging ropes 501 of each set of lifting ropes 5 are connected by connecting ropes 502. By setting the lifting rope 5 as a plurality of hanging ropes 501, the plurality of hanging ropes 501 are arranged in parallel, and the hanging ropes 501 of each set of lifting ropes 5 are connected by connecting ropes 502, so that the plurality of hanging ropes 501 form a whole, improving the stability.

[0037] As Figure 2 , Figure 4 and Figure 5 shown in the figure, in this embodiment, an automatic telescopic member 6 is further included. The automatic telescopic member 6 can be an electric push rod, a hydraulic push rod, a pneumatic push rod or other automatically telescopic elements. A rectangular ring 7 that can surround the two sets of lifting ropes 5 is provided at the crossing position of the two sets of lifting ropes 5. The outer contour and the inner hole of the rectangular ring 7 are both rectangular. The upper end of the rectangular ring 7 is connected to the automatic telescopic member 6 through an up-and-down sliding member 8.

[0038] The specific structure of the up-and-down sliding member 8 is as follows: The up-and-down sliding member 8 includes a sliding shaft 801. At the bottom end of the automatic telescopic member 6, there is a vertical sliding groove 802. The sliding shaft 801 is slidably connected to the vertical sliding groove 802 up and down. The cross-sectional shape of the sliding shaft 801 is T-shaped, and the vertical sliding groove 802 matches the sliding shaft 801 to prevent the sliding shaft 801 from completely sliding out of the vertical sliding groove 802. The bottom end of the sliding shaft 801 is fixedly connected to the rectangular ring 7. By providing the vertical sliding groove 802 at the bottom of the automatic telescopic member 6 and slidably arranging a sliding shaft 801 in the vertical sliding groove 802, therefore, the rectangular ring 7 can slide freely relative to the automatic telescopic member 6 to a certain extent. Therefore, on the one hand, when the automatic telescopic member 6 has adjusted its telescopic length and is lifted, under the action of the gravity of the casting, the casting has a certain downward dragging displacement on the clamping pliers 1, so that the clamping pliers 1 are further closed to ensure clamping of the casting. On the other hand, when removing the mold sand on the surface of the casting by high-pressure water spraying, by continuously opening and closing the clamping pliers 1 to shake the casting, the shaking effect on the casting can be improved, thereby further promoting the removal of the mold sand on the surface of the casting.

[0039] As Figure 1 , Figure 2 and Figure 4 shown, a rhombic four-link 9 is hinged at the lower end of the rectangular ring 7. The rhombic four-link 9 includes four rods 901. The four rods 901 are connected end to end in sequence and are all connected by hinge shafts 902 at the connection points. The vertices on the left and right sides of the rhombic four-link 9 are respectively hinged to the power arms 102 of the two clamping pliers 1. A pressing rod 10 is connected at the vertex at the bottom of the rhombic four-link 9. In addition, four U-shaped connecting seats 903 are also included. The connecting seats 903 are fixedly connected to the bottom of the rectangular ring 7, the inner sides of the two power arms 102, and the top of the pressing rod 10. The connecting seats 903 are hinged to the rhombic four-link 9 by the hinge shafts 902 at the connection points of the rods 901. The upper end of the pressing rod 10 is fixed to the bottom of the connecting seat 903 at the bottom of the rhombic four-link 9. To avoid interference, an opening 11 through which the pressing rod 10 can pass is provided in the middle of the clamping pliers 1.

[0040] By providing the rhombic four-link 9 and arranging the rhombic four-link 9 as rods 901 hinged end to end, due to the deformation effect of the rhombic four-link 9, when the automatic telescopic member 6 expands and contracts, it can drive the upper and lower vertices and the left and right vertices of the rhombic four-link 9 to move simultaneously, so that the movement in one direction is converted into the movement in two directions, thereby generating multiple effects to better clamp the casting. In addition, the self-deformable characteristic of the rhombic four-link 9 can make the gravity of the casting be converted into the clamping force for holding the clamping pliers 1 through the lifting rope 5 to improve the clamping effect on the casting.

[0041] In addition, a retaining rope 12 is fixed to each of the front and rear sides of the rectangular ring 7. The two retaining ropes 12 are detachably connected to the front and rear sides of the bottom of the clamping pliers 1 respectively. A ring-shaped buckle 21 can be fixed to the front and rear sides of the bottom of the clamping pliers 1 respectively. The buckle 21 can be a finished product of an ordinary buckle 21 or replaced by a ring-shaped member, and the retaining rope 12 is tied and fixed to the buckle 21. The arrangement of the retaining rope 12 can protect the casting on the front and rear sides of the clamping pliers 1, so that the casting is protected in multiple angular directions, preventing the casting from slipping off from the front and rear ends, improving the protection effect on the casting, and enhancing the safety of hoisting.

[0042] In addition, as Figure 1 , Figure 2 and Figure 6 shown, outer ventilation bags 13 are provided on the outer sides of the arc-shaped clamping portions 101 of the two clamping pliers 1, and an inflation port can be provided on the outer ventilation bags 13. An inner ventilation bag 14 is provided on the inner side of the arc-shaped clamping portion 101, and an air passage (not shown in the drawing) connecting the inner ventilation bag 14 and the outer ventilation bag 13 is provided inside the arc-shaped clamping portion 101. A plurality of air columns 15 are provided on the inner side surface of the inner ventilation bag 14, and the air columns 15 communicate with the inner ventilation bag 14. By providing an outer ventilation bag 13 on the outer side of the arc-shaped clamping portion 101 of the clamping pliers 1, an inner ventilation bag 14 on the inner side, and a plurality of air columns 15 on the inner side of the inner ventilation bag 14, on the one hand, the soft function of the outer ventilation bag 13 can provide anti-collision protection for the clamping pliers 1 and improve the safety of hoisting; the soft function of the inner ventilation bag 14 can protect the casting and reduce damage to the surface of the casting during clamping. On the other hand, during hoisting, the lifting rope 5 will tighten the outer ventilation bag 13, and the outer ventilation bag 13 is compressed, causing the gas to enter the inner ventilation bag 14, so that the inner ventilation bag 14 and the air columns 15 expand, further pressing the casting tightly and improving the clamping effect on the casting; when clamping the casting, due to the reverse pressure of the casting on the air columns 15 and the inner ventilation bag 14, the air columns 15 and the inner ventilation bag 14 are compressed, causing the gas to enter the inner ventilation bag 14, thereby playing a certain tensioning role on the lifting rope 5, increasing the clamping force of the clamping pliers 1, and finally forming a balance with each other to ensure the clamping effect on the casting.

[0043] In addition, the deformation of the inner ventilation bag 14 and the plurality of air columns 15 can form a wrapping around the casting. Especially when clamping a casting with an irregular surface, the air columns 15 can better and more closely fit on the irregular surface of the casting, improving the clamping effect.

[0044] In addition, the arrangement of the air columns 15 on the inner air bag 14 forms an uneven and rough clamping surface as a whole, improving the anti-slip effect and the anti-slip effect of clamping the casting; in addition, when high-pressure water spraying is carried out on the casting for sand removal (removing the mold sand adhering to the surface of the casting) during hoisting, the high-pressure water can flow in from the gaps between the air columns 15 and enter the inner part of the outer surface of the casting, which is also convenient for the high-pressure water to flow out from the inside to carry out the mold sand, facilitating the removal of the mold sand on the surface of the casting.

[0045] In addition, the deformation characteristics of the air columns 15, the inner air bag 14 and the outer air bag 13 help the casting to shake when the clamping pliers 1 are continuously opened and closed slightly, facilitating the removal of the mold sand.

[0046] In addition, with the arrangement of the inner air bag 14 and the outer air bag 13, when hoisting the just-demolded casting, the heat on the casting will be transferred to the air columns 15, the inner air bag 14 and the outer air bag 13, causing the air columns 15, the inner air bag 14 and the outer air bag 13 to expand due to heat, so as to clamp the casting more tightly and make reasonable use of the heat of the casting.

[0047] Furthermore, the inner side of the outer air bag 13 is adhesively attached to the outer arc surface of the arc-shaped clamping part 101, and a shaping keel 16 is arranged on the outer side surface of the outer air bag 13. The shaping keel 16 can be made of a thin steel bar that can be bent and rebound. The shaping keel 16 is adhesively attached to the outer side surface of the outer air bag 13. The function of the shaping keel 16 is to make the outer side surface of the outer air bag 13 relatively stiff as a whole. When the lifting rope 5 tightly presses the outer air bag 13 inward, it is convenient for the outer side surface of the outer air bag 13 to be compressed inward as a whole, thereby ensuring the compression effect of the outer air bag 13, and then promoting the expansion of the inner air bag 14 to press the casting tightly, preventing the problem of insufficient compression caused by the compression only at the position where the outer air bag 13 contacts the lifting rope 5.

[0048] In the present invention, an automatic telescopic member 6, a lifting plate 3, and two intersecting clamping pliers 1 are provided. Two pulleys 4 are slidably arranged at the bottom of the lifting plate 3. Two groups of inserting claws 103 are correspondingly arranged at the bottom of the two clamping pliers 1 in an interlaced manner. One set of lifting ropes 5 is fixedly connected to the top of each of the two clamping pliers 1. After the lifting ropes 5 cross, they respectively bypass the pulleys 4 in the opposite direction and are detachably connected to the inserting claws 103 inserted from below. A rectangular ring 7 is arranged at the crossing of the middle parts of the lifting ropes 5. The lower end of the rectangular ring 7 is hinged to a rhombic four-link 9. Both sides of the rhombic four-link 9 are connected to the clamping pliers 1, and a pressing rod 10 is arranged at the bottom of the rhombic four-link 9; Therefore, during hoisting, the automatic telescopic member 6 is activated. When the automatic telescopic member 6 extends downward, the automatic telescopic member 6 causes the rhombic four-bar linkage 9 to be compressed inward in the vertical direction and expand outward in the horizontal direction, thereby driving the clamping pliers 1 to open outward so as to open and grasp the casting or lower the casting; when the automatic telescopic member 6 retracts upward, the automatic telescopic member 6 causes the rhombic four-bar linkage 9 to be compressed inward in the horizontal direction and expand outward in the vertical direction at the same time, thereby driving the clamping pliers 1 to close inward and automatically hold the casting tightly. That is to say, by the telescoping of the automatic telescopic member 6, the clamping pliers 1 can be driven to open or close, so as to automatically clamp or release the casting, which is more time-saving, labor-saving and convenient; In addition, through the cooperative setting of the rhombic four-bar linkage 9, the hoisting rope 5, the pressing rod 10 and the rectangular ring 7, and since the automatic telescopic member 6 is not directly connected to the clamping pliers 1, after the casting is lifted, due to the gravity of the casting, there will be a pulling force on the hoisting rope 5, which causes the hoisting rope 5 to be tightened. After the hoisting rope 5 is further tightened, the upper end of the hoisting rope 5 causes the power arm 102 of the clamping pliers 1 to twist inward, and the lower end of the hoisting rope 5 causes the inserting gripper 103 to twist in the opposite direction, so that the two clamping pliers 1 can better close relatively. Moreover, the greater the gravity of the casting, the greater the tension of the hoisting rope 5, and the greater the pulling force of the hoisting rope 5 on the two ends of the clamping pliers 1 to close inward, ensuring the clamping effect and avoiding the weakening of the clamping effect caused by the increase in the gravity of the casting; on the other hand, after the hoisting rope 5 is further tightened, the hoisting rope 5 will press inward on the arc-shaped clamping portion 101, reducing the outward loosening of the clamping pliers, and preventing the arc-shaped clamping portion from deforming or loosening outward to a certain extent, ensuring the clamping effect; in summary, while the clamping pliers 1 further tighten, the rhombic four-bar linkage 9 is compressed in the left, right and up directions, thereby driving the rhombic four-bar linkage 9 to extend up and down. After the bottom vertex of the rhombic four-bar linkage 9 extends downward, it then pushes the pressing rod 10 to move downward so as to better press the casting. At the same time, after the top vertex of the rhombic four-bar linkage 9 extends upward, it pushes the rectangular ring 7 to move upward, and makes the intersection point of the two groups of hoisting ropes 5 move upward, thereby increasing the wrap angle of the hoisting rope 5 at the rectangular ring 7, making the hoisting rope 5 further tightened, improving the clamping tension of the hoisting rope on the clamping pliers 1, and better clamping and holding the casting. The above-mentioned coordinated cooperation of the hoisting rope 5 and the rhombic four-bar linkage 9 improves the fastening effect on the casting in multiple aspects and prevents the casting from falling off.

[0049] In addition, the insertion claws 103 of the clamping pliers 1 are arranged such that the bottoms of the two clamping pliers 1 cross each other and are pulled by the lifting ropes 5, preventing the bottoms of the clamping pliers 1 from loosening. Moreover, the insertion depth can be adjusted according to the size of the casting, enabling the firm clamping of castings of different sizes and greatly improving the clamping effect on castings of different sizes. In addition, the lifting ropes 5 and the clamping pliers 1 are cross-connected respectively, further forming a closed loop for the clamping of the clamping pliers 1. When the size of the casting is large and the insertion claws of the two clamping pliers cannot cross each other, the supporting effect at the bottom of the lifting ropes also keeps the clamping area in a closed-loop state, ensuring the clamping and protection effect on the casting and preventing the casting from slipping. Even when clamping large-sized castings, the clamping and protection effect on the casting can be guaranteed. In addition, the lifting ropes 5 and the clamping pliers 1 cross and connect with each other, that is, the two clamping pliers 1 are respectively connected to each other through the lifting ropes 5 (both ends of each group of lifting ropes 5 are respectively connected to the two clamping pliers 1). When the weights on the left and right sides of the casting are different, through the force transmission of the lifting ropes 5, it will be transmitted to the clamping pliers 1 on the other side, balancing the instability caused by different weights on the left and right sides of the casting to a certain extent and making the lifting of the casting more stable.

[0050] In addition, under the gravity pulling of the casting, the lifting ropes 5 can tightly hold the two arc-shaped clamping parts 101 together, avoiding or reducing the deformation or opening of the arc-shaped clamping parts 101 under the downward pressure of the casting, thus preventing the casting from enlarging the opening of the arc-shaped clamping parts 101 and causing the casting to slip. Additionally, with the setting of the lifting ropes 5, when hoisting a casting with a relatively large size, such as when the size of the casting is larger than that of the arc-shaped clamping parts 101, the insertion claws 103 at the bottom of the arc-shaped clamping parts 101 cannot be inserted together, forming an opening. At this time, the lifting ropes 5 drag at the bottom of the arc-shaped clamping parts 101, which can support the bottom of the casting, prevent the casting from slipping and falling, ensure the smooth progress of the hoisting, and improve safety.

[0051] In addition, by arranging a horizontal sliding groove 19 on the lifting plate 3, a slider 18 is slidably arranged in the horizontal sliding groove 19, and a pulley 4 is rotatably connected between two sliders 18 corresponding to each other in the front and back. Therefore, during hoisting, due to the different sizes of the castings, when the clamping degrees of the arc-shaped clamping pliers 1 are different, after lifting the casting, under the gravity of the casting, the slider 18 is driven to move and adjust by the lifting ropes 5. After adjustment, the outer sides of the lifting ropes 5 basically reach a relatively natural vertical state, facilitating the lifting ropes 5 to exert a certain tightening effect on the clamping pliers 1 and enabling the clamping pliers 1 to clamp the casting better.

[0052] A hoisting method using a hoisting device for casting production for hoisting: includes the following steps: (1) Hang the lifting plate 3 on the crane, move the lifting plate 3 above the casting, the automatic telescopic member 6 extends downward and drives the rectangular ring 7 to move downward. After the rectangular ring 7 moves downward, it drives the rhombic four-link 9 to be compressed downward and expand to the left and right at the same time. After the left and right sides of the rhombic four-link 9 expand outward, they drive the two clamping pliers 1 to open to the limit position; then move the clamping pliers 1 downward so that both sides of the arc-shaped clamping portion 101 cover the outside of the casting. The automatic telescopic member 6 retracts upward and drives the rectangular ring 7 to move upward. After the rectangular ring 7 moves upward, it drives the rhombic four-link 9 to expand up and down and compress inward on both left and right sides, and then drives the downward pressure rod 10 to move downward to press the casting; at the same time, it makes the two clamping pliers 1 close to tightly hold the casting. (2) Connect the bottoms of the two groups of lifting ropes 5 to the insertion claws 103. After connection, the lifting rope 5 on one of the clamping pliers 1 bypasses the pulley 4 and is connected to the insertion claw 103 of the other clamping plier 1. (3) Connect the lower ends of the two protective ropes 12 to the front and rear sides of the bottom of the clamping pliers 1 respectively. After connection, make the protective ropes 12 in a tensioned state. (4) The lifting plate is lifted upward to hoist and transfer the casting; during this process, the gravity of the casting makes the lifting rope 5 further tensioned. After the lifting rope 5 is tensioned, it generates a clamping torsional pulling force on the clamping pliers, driving the clamping pliers 1 to close inward or tend to close inward, and at the same time driving the downward pressure rod 10 to move downward or tend to move downward to press the casting. (5) After hoisting the casting to the destination position, untie the protective ropes 12 and the lifting ropes 5, the automatic telescopic member 6 extends downward, drives the rhombic four-link 9 to open the arc-shaped clamping pliers 1, and puts down the casting.

[0053] By using a hoisting method for hoisting with a hoisting device for casting production, the casting can be automatically held or released, which is simple and convenient, avoiding the laborious and inconvenient problems in the prior art, such as lifting the casting and placing it in the clamping pliers 1 and manually pulling the clamping pliers 1.

[0054] In addition, when hoisting to the sand removal area of the casting, between step (4) and step (5), the following steps are further included: during the process of high-pressure water spraying and sand removal of the casting, the automatic telescopic member 6 continuously extends and retracts up and down, making the clamping pliers 1 continuously hold and release, so that the casting shakes in the clamping pliers 1; after sand removal is completed, the automatic telescopic member 6 retracts upward, drives the clamping pliers 1 to hold the casting tightly, and then hoists and transfers the casting.

[0055] When removing sand from the casting, the automatic telescopic member 6 extends and retracts back and forth, causing the clamping pliers 1 to open and close within a small range, thereby helping the casting to shake. At the moment when the casting shakes or vibrates, it is convenient to generate a small gap between the casting and the clamping pliers 1, facilitating the entry of high-pressure water spray into the interior to facilitate the removal of the mold sand from the casting. The hoisting device is reasonably utilized to remove sand from the casting, preventing the problem that in the prior art, when removing sand, the casting needs to be put down, and after the sand removal is completed, the casting needs to be clamped again, resulting in relatively troublesome operations.

[0056] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. It should be understood that the specific embodiments described herein are only used to understand the present invention and are not used to limit the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Claims

1. A hoisting device for casting production, comprising two clamping pliers arranged crosswise. The clamping pliers include an arc-shaped clamping part at the lower part and a power arm at the upper part. The two clamping pliers are rotationally connected in the middle through a rotating shaft, and it is characterized in that: Two sets of inserting claws are correspondingly arranged at the bottoms of the two clamping pliers in a staggered manner. When the two clamping pliers are closed, the two sets of inserting claws can be inserted into each other crosswise. It includes a lifting plate. Two pulleys are slidably connected to the left and right below the lifting plate. One set of lifting ropes is fixedly connected to the top of each of the two clamping pliers. After the two sets of lifting ropes cross, they respectively bypass the pulleys in the opposite direction and are detachably connected to the inserting claws inserted from below. It includes an automatic telescopic member. A rectangular ring that can surround the two sets of lifting ropes is provided at the crossing position of the two sets of lifting ropes. The upper end of the rectangular ring is connected to the automatic telescopic member through an up-and-down sliding member. A rhombic four-link is hinged at the lower end of the rectangular ring. A pressing rod is connected to the vertex at the bottom of the rhombic four-link. An opening through which the pressing rod can pass is provided in the middle of the clamping pliers. The vertices on the left and right sides of the rhombic four-link are respectively hinged to the power arms of the two clamping pliers. One protective rope is fixed to each of the front and rear sides of the rectangular ring. The two protective ropes are respectively detachably connected to the front and rear sides of the bottom of the clamping pliers.

2. The hoisting device for casting production according to claim 1, characterized in that: Outer air bags are provided on the outer sides of the arc-shaped clamping parts of the two clamping pliers. Inner air bags are provided on the inner sides of the arc-shaped clamping parts. An air passage connecting the inner air bags and the outer air bags is provided inside the arc-shaped clamping parts. A plurality of air columns are provided on the inner side surface of the inner air bags, and the air columns are communicated with the inner air bags.

3. The lifting device for casting production according to claim 2, wherein: The inner side of the outer air bag is adhesively attached to the outer arc surface of the arc-shaped clamping part, and a shaping keel is provided on the outer side surface of the outer air bag.

4. A hoisting device for casting production according to claim 1, characterized in that: The up-and-down sliding member includes a sliding shaft. A vertical sliding groove is provided at the bottom end of the automatic telescopic member. The sliding shaft is slidably connected to the vertical sliding groove up and down, and the bottom end of the sliding shaft is fixedly connected to the rectangular ring.

5. A hoisting device for casting production according to claim 1, characterized in that: Two horizontal sliding grooves extending left and right are provided at the front and rear of the lower part of the lifting plate. Two sliders are slidably connected in each horizontal sliding groove. The pulleys are rotatably connected between the two sliders corresponding to the front and rear.

6. The hoisting device for casting production according to claim 1, characterized in that: The rhombic four-link includes four rods, and the four rods are connected end to end in sequence and are all connected through hinge shafts at the connection points.

7. The hoisting device for casting production according to claim 6, characterized in that: It also includes four U-shaped connecting seats. The bottom of the rectangular ring, the inner sides of the two power arms, and the top of the pressing rod are all fixedly connected with the connecting seats. The connecting seats are hinged to the hinge shafts at the connection points of the rhombic four-link through the rods.

8. A hoisting device for casting production according to claim 1, characterized in that: Each set of lifting ropes includes a plurality of hanging ropes. The plurality of hanging ropes are arranged in parallel, and the hanging ropes in each set of lifting ropes are connected through connecting ropes.

9. A hoisting method for hoisting using a hoisting device for casting production as described in claim 1, characterized in that: It includes the following steps: (1) Hang the lifting plate on the crane, move the lifting plate above the casting, the automatic telescopic member extends downward and drives the rectangular ring to move downward. After the rectangular ring moves downward, it drives the rhombic four-link to be compressed downward and expand to the left and right at the same time. After the left and right sides of the rhombic four-link expand outward, they drive the two clamping pliers to open to the limit position; then move the clamping pliers downward so that the two sides of the arc-shaped clamping part cover the outside of the casting. The automatic telescopic member retracts upward and drives the rectangular ring to move upward. After the rectangular ring moves upward, it drives the rhombic four-link to expand up and down and compress inward on the left and right sides at the same time, and then drives the pressing rod to move downward; at the same time, the two clamping pliers are closed to tightly hold the casting. (2) Connect the bottoms of the two sets of lifting ropes to the inserting claws. After the connection, the lifting rope on one clamping plier bypasses the pulley and is connected to the inserting claw of the other clamping plier. (3) Connect the lower ends of the two safety ropes to the front and rear sides of the bottom of the clamping pliers respectively. After connection, the safety ropes are in a tensioned state. (4) Lift the hanging plate upward and hoist and transfer the casting. During this process, the gravity of the casting causes the lifting rope to be further tensioned. After the lifting rope is tensioned, it generates a clamping and torsional pulling force on the clamping pliers, driving the clamping pliers to close inward or tend to close inward, and at the same time driving the downward pressure rod to move downward or tend to move downward to press the casting. (5) After hoisting the casting to the destination position, untie the safety rope and the lifting rope, and the automatic telescopic member extends downward, driving the rhombic four-link mechanism to open the arc-shaped clamping pliers and put down the casting.

10. The hoisting method using a hoisting device for casting production according to claim 9, characterized in that: When hoisting the casting to the sand removal area, between step (4) and step (5), the following steps are further included: during the process of high-pressure water spraying and sand removal of the casting, the automatic telescopic member continuously extends and retracts up and down, so that the clamping pliers continuously hold and release, causing the casting to shake in the clamping pliers; after the sand removal is completed, the automatic telescopic member retracts upward, driving the clamping pliers to hold the casting tightly, and then hoisting and transferring the casting.

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