Positioning device for hoisting of crane

Abstract

The invention relates to the technical field of hoisting equipment, in particular to a positioning device for hoisting of a crane. According to the technical scheme, the device comprises a top plate and further comprises a first positioning mechanism, the first positioning mechanism comprises a circular plate, the circular plate is arranged on the lower side of the top plate, the top of the circular plate is fixedly connected with a first telescopic rod, and the telescopic end of the first telescopic rod is fixedly connected with the bottom of the top plate. Through the design of the first positioning mechanism and the second positioning mechanism, when the conical workpiece is placed in a first state, the conical workpiece can be in contact with the inner wall of the conical workpiece through three first balls, so that the conical workpiece is clamped, a top plate and a circular plate coincide with the circle center of the conical workpiece, and when the conical workpiece is placed in a second state, the conical workpiece is clamped. Through quick positioning of the conical workpieces in two states, the working steps of workers can be reduced, the working efficiency is greatly improved, and abrasion of the conical workpieces caused by friction between the conical workpieces is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting equipment, and particularly relates to a positioning device for crane hoisting. Background Art

[0002] As a mechanical device for handling, lifting, and moving heavy objects, cranes play an important role in many fields such as construction, manufacturing, and transportation. Driven by the continuous development of the industry and the diverse needs of the market, the types of cranes continue to increase.

[0003] For different hoisted objects, different specifications of cranes are required for hoisting work. By equipping the lifting tool with a suitable positioning device, the work efficiency can be effectively increased. When the existing hoisting equipment hoists a conical workpiece, an electro-permanent magnetic chuck is often used to adsorb and hoist the conical workpiece. Although this method is fast, it cannot accurately position the placement position of the conical workpiece. In order to reduce damage to the conical workpiece during transportation, the conical workpieces are often placed in a relatively stacked manner. When the stacking work of the conical workpieces is required, the staff needs to manually adjust the posture and position of the conical workpiece during hoisting, which is time-consuming and laborious, with low efficiency, and the staff is prone to injury. Summary of the Invention

[0004] In order to overcome the shortcomings in the prior art, the present invention provides a positioning device for crane hoisting.

[0005] The technical solution of the present invention is as follows: A positioning device for crane hoisting, including a top plate, and further including a first positioning mechanism. The first positioning mechanism includes a circular plate. The circular plate is arranged on the lower side of the top plate. The top of the circular plate is fixedly connected with a first telescopic rod. The telescopic end of the first telescopic rod is fixedly connected with the bottom of the top plate. An air valve is installed on the outer wall of the fixed end of the first telescopic rod. A plurality of uniformly distributed first connecting rods are hinged to the bottom of the top plate. A plurality of uniformly distributed through grooves are formed in the top of the circular plate. A sliding block is slidably connected in each of the plurality of through grooves. One end of the first connecting rod is hinged to the sliding block. A first ball is rotatably connected to one side of the sliding block. Further included is a second positioning mechanism. The second positioning mechanism includes a sliding rod. A plurality of uniformly distributed sliding rods are slidably connected through the top of the top plate. A first tension spring is arranged between each of the plurality of sliding rods and the top plate. A U-shaped frame is slidably sleeved on the outer wall of each of the plurality of sliding rods. A second telescopic rod is arranged on the lower side of the U-shaped frame.

[0006] As a preferred technical solution of the present invention, the second positioning mechanism further includes a short shaft. Vertical grooves are formed at the bottoms of several of the sliding rods, and the short shafts are slidably connected in the vertical grooves. A first compression spring is arranged between the short shaft and the inner wall of the vertical groove. L-shaped tubes are arranged on the lower sides of several of the sliding rods. A first sliding groove is formed at the top end of the L-shaped tube. The bottom end of the short shaft is clamped into the first sliding groove and slides therein. A second compression spring is arranged between the short shaft and the inner wall of the first sliding groove. A vertical plate is fixedly connected to the top end of the L-shaped tube. A second ball is rotatably connected to one end of the L-shaped tube.

[0007] As a preferred technical solution of the present invention, the second positioning mechanism further includes a third ball. The third ball is rotatably connected to the bottom end of the L-shaped tube. A special-shaped plate is fixedly connected to the outer wall of the L-shaped tube. Installation boxes are fixedly connected to the outer walls of several of the sliding rods. A first toothed plate is slidably connected in the installation box. A second tension spring is arranged between the first toothed plate and the inner wall of the installation box. A sliding groove is formed in a penetrating manner on the outer wall of the installation box. A cross shaft that cooperates with the special-shaped plate is fixedly connected to the outer wall of the first toothed plate. One end of the cross shaft is clamped into the sliding groove and slides therein. Several uniformly distributed second toothed plates are fixedly connected to the outer wall of the circular plate. The first toothed plate and the second toothed plate cooperate with each other.

[0008] As a preferred technical solution of the present invention, it further includes a delay mechanism. The delay mechanism includes a second connecting rod. Several uniformly distributed second connecting rods are hinged to the bottom of the top plate. Horizontal plates are fixedly sleeved on the outer walls of several of the sliding rods. The U-shaped frame is slidably connected to the bottom of the horizontal plate. A sliding frame is slidably sleeved on the outer wall of the horizontal plate. One end of the second connecting rod is hinged to the sliding frame. A first elastic telescopic rod is fixedly connected to the bottom of the sliding frame in a penetrating manner. The telescopic end of the first elastic telescopic rod is fixedly connected to the U-shaped frame. A U-shaped groove is formed in a penetrating manner at the bottom of the horizontal plate. A sliding plate is slidably connected to the inner wall of the U-shaped groove. A first wedge block that cooperates with the U-shaped frame is fixedly connected to the bottom of the sliding plate. The first wedge block is clamped into the U-shaped groove of the horizontal plate and slides therein.

[0009] As a preferred technical solution of the present invention, the delay mechanism further includes a second wedge block. The second wedge block is fixedly connected to the bottom of the sliding plate. The second wedge block cooperates with the sliding frame. The second wedge block is clamped into the U-shaped groove of the horizontal plate and slides therein.

[0010] As a preferred technical solution of the present invention, the delay mechanism further includes a rectangular block, the rectangular block is fixedly connected to the bottom of the sliding frame, a connecting rod is slidably connected to the inner wall of the U-shaped frame, a third tension spring is arranged between the connecting rod and the inner wall of the U-shaped frame, a locking block is fixedly connected to the outer wall of the connecting rod, and a wedge-shaped groove for cooperating with the locking block is opened on one side of the rectangular block.

[0011] As a preferred technical solution of the present invention, it further includes an unlocking block, the unlocking block is fixedly connected to the bottom of the cross plate, and the unlocking block is used in cooperation with the locking block.

[0012] As a preferred technical solution of the present invention, it further includes an extension mechanism, the extension mechanism includes an L-shaped plate, the L-shaped plate is fixedly connected to the outer walls of a plurality of sliding rods, an extrusion plate is hinged to one side of the L-shaped plate, a first protruding shaft for cooperating with the extrusion plate is fixedly connected to the outer wall of the L-shaped tube, an elastic telescopic shaft is fixedly connected to the bottom of the U-shaped frame, the fixed end of the second telescopic rod is fixedly connected to the telescopic end of the elastic telescopic shaft, and a contact rod for cooperating with the extrusion plate is fixedly connected to the telescopic end of the elastic telescopic shaft.

[0013] As a preferred technical solution of the present invention, the extension mechanism further includes a second elastic telescopic rod, the second elastic telescopic rod is fixedly connected to the U-shaped frame in a penetrating manner, the telescopic end of the second elastic telescopic rod is slidably connected to the outer wall of the sliding rod, an air bag is communicated with the outer wall of the fixed end of the second elastic telescopic rod, and a hose is commonly communicated between the air bag and the second telescopic rod.

[0014] As a preferred technical solution of the present invention, it further includes an elastic limit pin, a cylindrical groove is opened in the inner wall of the fixed end of the second telescopic rod, the elastic limit pin is slidably connected in the cylindrical groove, and an electromagnet is fixedly installed. A limit groove for cooperating with the elastic limit pin is opened on the outer wall of the telescopic end of the second telescopic rod, and a magnetic block is fixedly connected to one end of the elastic limit pin.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. Through the design of the first positioning mechanism and the second positioning mechanism, when the conical workpiece is placed in the first state, it can contact the inner wall of the conical workpiece through three first ball bearings, thereby clamping the conical workpiece and making the center of the top plate, the round plate and the conical workpiece coincide. When the conical workpiece is placed in the second state, by contacting the outer wall of the conical workpiece with the telescopic ends of the three second telescopic rods, the centers of the two conical workpieces in different states can be made to coincide, so as to quickly complete the stacking of the two conical workpieces in different states. Through the rapid positioning of the conical workpieces in two states, the working steps of the staff can be reduced, the working efficiency can be greatly improved, and the friction between the conical workpieces can be prevented, resulting in wear of the conical workpieces.

[0017] 2. Through the design of the vertical plate, when the top of the vertical plate contacts the bottom end of the sliding rod, it can prevent the L-shaped pipe from lifting upward relative to the corresponding sliding rod, resulting in the first protruding shaft on the L-shaped pipe squeezing the bottom of the adjacent extrusion plate, so that the telescopic end of the elastic telescopic shaft drives the second telescopic rod to descend and contact the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the whole of the present invention;

[0019] Figure 2 is a schematic structural diagram of the first positioning mechanism of the present invention;

[0020] Figure 3 is a schematic structural diagram of the second positioning mechanism of the present invention;

[0021] Figure 4 is a schematic installation diagram at the short axis of the present invention;

[0022] Figure 5 is a schematic structural diagram of the delay mechanism of the present invention;

[0023] Figure 6 is a schematic installation diagram at the first toothed plate of the present invention;

[0024] Figure 7 is a schematic installation diagram at the second wedge block of the present invention;

[0025] Figure 8 is a schematic installation diagram at the first wedge block of the present invention;

[0026] Figure 9 is a schematic structural diagram of the extension mechanism of the present invention;

[0027] Figure 10 is a schematic installation diagram at the elastic limit pin of the present invention.

[0028] Among them, the above-mentioned drawings include the following reference numerals: 1, top plate; 201, circular plate; 202, first telescopic rod; 203, air valve; 204, first connecting rod; 205, sliding block; 206, first ball; 207, sliding rod; 208, C-shaped frame; 209, second telescopic rod; 301, short shaft; 302, L-shaped pipe; 303, vertical plate; 304, second ball; 401, third ball; 402, special-shaped plate; 403, mounting box; 404, first toothed plate; 405, second toothed plate; 501, second connecting rod, 5011, horizontal plate, 5012, sliding frame; 502, first elastic telescopic rod; 503, sliding plate; 504, first wedge block; 505, second wedge block; 601, rectangular block; 602, connecting rod; 603, locking block; 701, unlocking block; 801, L-shaped plate; 802, pressing plate; 803, elastic telescopic shaft; 804, contact rod; 901, second elastic telescopic rod; 902, airbag; 1001, elastic limit pin; 1002, electromagnet; 100, conical workpiece. Detailed implementation manners

[0029] Although the present invention may be described with respect to a particular application or industry, those skilled in the art will recognize the broader applicability of the present invention. Those of ordinary skill in the art will recognize that terms such as above, below, upward, downward, etc. are used to describe the drawings and do not represent a limitation on the scope of the present invention as defined by the appended claims. Any numerical labels such as first or second are merely illustrative and are not intended to limit the scope of the present invention in any way.

[0030] Embodiment 1

[0031] A positioning device for crane hoisting, as Figures 1-3As shown, it includes a top plate 1 and a first positioning mechanism, the first positioning mechanism includes a circular plate 201, the circular plate 201 is arranged on the lower side of the top plate 1, the circular plate 201 is coaxial with the top plate 1, a first telescopic rod 202 is fixedly connected to the top of the circular plate 201, the telescopic end of the first telescopic rod 202 is fixedly connected to the bottom of the top plate 1, an air valve 203 is installed on the outer wall of the fixed end of the first telescopic rod 202, and the air volume of the inner cavity of the first telescopic rod 202 can be controlled by the air valve 203, three evenly distributed first connecting rods 204 are hinged at the bottom of the top plate 1, and three evenly distributed through grooves are opened on the top of the circular plate 201, and sliding blocks are horizontally slidably connected in the three through grooves. 205, one end of the three first connecting rods 204 is hinged to the corresponding sliding block 205, and one side of the sliding block 205 is rollingly connected with a first ball 206, and the first ball 206 is used to contact the inner wall of the conical workpiece 100, and also includes a second positioning mechanism, the second positioning mechanism includes a sliding rod 207, and the top of the top plate 1 is vertically slidably connected with three evenly distributed sliding rods 207, and a first tension spring is arranged between the three sliding rods 207 and the top plate 1, and the first tension spring is sleeved on the outer wall of the sliding rod 207, and the outer walls of the three sliding rods 207 are horizontally slidably sleeved with a 匚-shaped frame 208, and a second telescopic rod 209 is arranged on the lower side of the 匚-shaped frame 208.

[0032] like Figure 3 and Figure 4 As shown, the second positioning mechanism also includes a short shaft 301, a vertical groove is provided at the bottom of the three sliding rods 207, and the short shaft 301 is vertically slidably connected in the vertical groove, a first compression spring is arranged between the short shaft 301 and the inner wall of the vertical groove, an L-shaped tube 302 is arranged on the lower side of the three sliding rods 207, a first sliding groove is provided at the top of the L-shaped tube 302, the bottom end of the short shaft 301 is stuck in the first sliding groove and slides horizontally therein, a second compression spring is arranged between the short shaft 301 and the inner wall of the first sliding groove, a vertical plate 303 is fixedly connected to the top of the L-shaped tube 302, when the top of the vertical plate 303 contacts the bottom end of the adjacent sliding rod 207, the first compression spring cannot shrink, and a second ball 304 is rollingly connected to one end of the L-shaped tube 302.

[0033] like Figures 4-6As shown in the figure, the second positioning mechanism further includes a third ball 401. The bottom end of the L-shaped tube 302 is connected to the third ball 401 in a rolling manner. An irregular plate 402 is fixedly connected to the top of the outer wall of the L-shaped tube 302. Mounting boxes 403 are fixedly connected to the outer walls of the three sliding rods 207. A first toothed plate 404 is horizontally slidably connected in the mounting box 403. A second tension spring is provided between the first toothed plate 404 and the inner wall of the mounting box 403. A sliding groove is penetratively formed in the outer wall of the mounting box 403. A cross shaft that cooperates with the irregular plate 402 is fixedly connected to the outer wall of the first toothed plate 404. One end of the cross shaft is inserted into the sliding groove and horizontally slides therein. Three uniformly distributed second toothed plates 405 are fixedly connected to the outer wall of the circular plate 201. The first toothed plate 404 and the second toothed plate 405 cooperate with each other. When the first toothed plate 404 meshes with the second toothed plate 405, the three sliding rods 207 and the circular plate 201 can be relatively stationary with respect to each other.

[0034] As Figure 5 , Figure 7 and Figure 8 shown in the figure, a delay mechanism is further included. The delay mechanism includes a second connecting rod 501. Three uniformly distributed second connecting rods 501 are hinged to the bottom of the top plate 1. Horizontal plates 5011 are fixedly sleeved in the middle of the outer walls of the three sliding rods 207. The U-shaped frame 208 is slidably connected to the bottom of the horizontal plate 5011. A sliding frame 5012 is horizontally slidably sleeved on the outer wall of the horizontal plate 5011. One ends of the three second connecting rods 501 are respectively hinged to the corresponding sliding frame 5012. A first elastic telescopic rod 502 is penetratively fixedly connected to the bottom of the sliding frame 5012. The telescopic end of the first elastic telescopic rod 502 is fixedly connected to the U-shaped frame 208. A U-shaped groove is penetratively formed in the bottom of the horizontal plate 5011. A sliding plate 503 is slidably connected to the inner wall of the U-shaped groove. A first wedge-shaped block 504 that cooperates with the U-shaped frame 208 is fixedly connected to the bottom of the sliding plate 503. The first wedge-shaped block 504 is inserted into the U-shaped groove of the horizontal plate 5011 and slides therein. The first wedge-shaped block 504 is used to limit the U-shaped frame 208.

[0035] As Figure 7 and Figure 8 shown in the figure, the delay mechanism further includes a second wedge-shaped block 505. The second wedge-shaped block 505 is fixedly connected to the bottom of the sliding plate 503. The second wedge-shaped block 505 and the sliding frame 5012 cooperate with each other. The second wedge-shaped block 505 is inserted into the U-shaped groove of the horizontal plate 5011 and slides therein. When the second wedge-shaped block 505 is squeezed, the first wedge-shaped block 504 can no longer limit the U-shaped frame 208.

[0036] As Figure 8As shown in the figure, the delay mechanism further includes a rectangular block 601. The bottom of the sliding frame 5012 is fixedly connected with the rectangular block 601. A connecting rod 602 is horizontally slidably connected to the inner wall of the U-shaped frame 208. A third tension spring is arranged between the connecting rod 602 and the inner wall of the U-shaped frame 208. A locking block 603 is fixedly connected to the outer wall of the connecting rod 602. Inclined surfaces are provided on both sides of the locking block 603. A wedge-shaped groove for cooperating with the locking block 603 is provided on one side of the rectangular block 601. When the locking block 603 is inserted into the wedge-shaped groove of the rectangular block 601, the U-shaped frame 208 can be limited by the connecting rod 602.

[0037] As Figure 8 shown in the figure, it further includes an unlocking block 701. The bottom of the cross plate 5011 is fixedly connected with the unlocking block 701. The unlocking block 701 is used in cooperation with the locking block 603. When the locking block 603 contacts the unlocking block 701, it can be disengaged from the wedge-shaped groove of the rectangular block 601.

[0038] As Figure 9 shown in the figure, it further includes an extension mechanism. The extension mechanism includes an L-shaped plate 801. The bottom of the outer walls of three sliding rods 207 are all fixedly connected with the L-shaped plate 801. One side of the L-shaped plate 801 is hinged with a pressing plate 802. The upper part of the outer wall of the L-shaped pipe 302 is fixedly connected with a first protruding shaft for cooperating with the pressing plate 802. The bottom of the U-shaped frame 208 is fixedly connected with an elastic telescopic shaft 803. The fixed end of the second telescopic rod 209 is fixedly connected with the telescopic end of the elastic telescopic shaft 803. The telescopic end of the elastic telescopic shaft 803 is fixedly connected with a contact rod 804 for cooperating with the pressing plate 802. When the pressing plate 802 rotates, it can extend the telescopic end of the elastic telescopic shaft 803 by pressing the contact rod 804.

[0039] As Figure 9 shown in the figure, the extension mechanism further includes a second elastic telescopic rod 901. The second elastic telescopic rod 901 is fixedly connected to one side of the U-shaped frame 208 in a penetrating manner. The telescopic end of the second elastic telescopic rod 901 is slidably connected to the outer wall of the sliding rod 207. The outer wall of the fixed end of the second elastic telescopic rod 901 is communicated with an airbag 902. A hose is jointly communicated between the airbag 902 and the second telescopic rod 209. When the telescopic end of the second elastic telescopic rod 901 contracts, the airbag 902 can be inflated.

[0040] As Figure 10 shown in the figure, it further includes an elastic limit pin 1001. A cylindrical groove is provided in the inner wall of the fixed end of the second telescopic rod 209. The elastic limit pin 1001 is slidably connected in the cylindrical groove, and an electromagnet 1002 is fixedly installed. A limit groove for cooperating with the elastic limit pin 1001 is provided on the outer wall of the telescopic end of the second telescopic rod 209. When the elastic limit pin 1001 is inserted into the limit groove of the telescopic end of the second telescopic rod 209, the telescopic end of the second telescopic rod 209 can be limited. One end of the elastic limit pin 1001 is fixedly connected with a magnetic block.

[0041] Initially, the telescopic end of the first telescopic rod 202 is in an extended state, and the first tension spring is in a contracted state. When it is necessary to lift the conical workpiece 100, there are two states according to the placement state of the conical workpiece 100. The first state is that the smaller-diameter end of the conical workpiece 100 is placed upward. At this time, first connect the crane to the top plate 1 through a steel wire rope, and then control the overall device to move above the conical workpiece 100 through the crane, and make the circular plate 201 roughly coincide with the center of the conical workpiece 100. Then control the overall device to descend through the crane, so that the bottom of the circular plate 201 contacts the top of the conical workpiece 100. Continue to control the overall device to descend through the crane, and the crane drives the top plate 1 to descend. At this time, the air valve 203 is in an open state, and the weight of the top plate 1 is applied to the telescopic end of the first telescopic rod 202. While the top plate 1 descends, the telescopic end of the first telescopic rod 202 contracts, and the air in the inner cavity of the first telescopic rod 202 is discharged through the air valve 203. While the top plate 1 descends, it drives the three sliding rods 207 to descend through the three first tension springs. The sliding rod 207 drives the corresponding short shaft 301 to descend through the first compression spring. The short shaft 301 drives the corresponding L-shaped pipe 302 to descend. The L-shaped pipe 302 drives the second ball 304 and the third ball 401 on it to descend. At the same time, the top plate 1 drives the three first connecting rods 204 to exert a thrust on the three sliding blocks 205, so that the sliding blocks 205 slide along the corresponding through grooves on the circular plate 201. At this time, the three sliding blocks 205 move away from each other and drive the corresponding first balls 206 to move. Subsequently, one of the second balls 304 contacts and presses against the outer wall of the conical workpiece 100. Since the conical workpiece 100 is relatively heavy, at this time, the conical workpiece 100 exerts a reaction force on the second ball 304 in contact with it. The second ball 304 drives the corresponding L-shaped pipe 302 to move horizontally under the force. The L-shaped pipe 302 drives the vertical plate 303 on it to move toward the side close to the adjacent short shaft 301. The second compression spring is compressed under the force. After the vertical plate 303 moves, the top of the vertical plate 303 abuts against the bottom end of the corresponding sliding rod 207. When the second compression spring is compressed to the limit, the second ball 304 in contact with the conical workpiece 100 exerts a force on the adjacent sliding rod 207 through the L-shaped pipe 302. The sliding rod 207 drives the top plate 1 to move under the force, so that the center of the top plate 1 moves closer to the center of the conical workpiece 100. Subsequently, the other two second balls 304 both contact the outer wall of the conical workpiece 100 and repeat the above steps to achieve the same effect until the centers of the top plate 1 and the conical workpiece 100 coincide. The top plate 1 can drive the circular plate 201 to move through the first telescopic rod 202, so that the centers of the circular plate 201 and the conical workpiece 100 coincide. Thus, the preliminary positioning of the overall device can be realized. By the top of the vertical plate 303 abutting against the bottom end of the sliding rod 207, the forces received by the three sliding rods 207 can be made equal, thereby improving the accuracy of the preliminary positioning and preventing the L-shaped pipe 302 from lifting upward relative to the corresponding sliding rod 207.The L-shaped tube 302 drives the first protruding shaft thereon to squeeze the bottom of the adjacent pressing plate 802, causing the telescopic end of the elastic telescopic shaft 803 to drive the corresponding second telescopic rod 209 to descend and contact the ground, resulting in the inability of the overall device to achieve the above effects. At the same time, one of the first balls 206 first contacts the inner wall of the conical workpiece 100. At this time, the conical workpiece 100 exerts a reaction force on the first ball 206 in contact with it. One of the first balls 206 is stressed and applies the reaction force to the top plate 1 through the corresponding slider 205 and the first connecting rod 204. The top plate 1 is stressed and drives the circular plate 201 to move on the top of the conical workpiece 100 through the first telescopic rod 202 until the other two first balls 206 both contact the inner wall of the conical workpiece 100, and the same effect is achieved by repeating the above steps. At this time, the centers of the top plate 1, the circular plate 201 and the conical workpiece 100 coincide. Close the air valve 203 to make the telescopic end of the first telescopic rod 202 unable to move. Thus, the three sliders 205 drive the first balls 206 thereon to closely fit the inner wall of the conical workpiece 100 respectively. Then, drive the top plate 1 to lift upward by a crane. When the top plate 1 lifts upward, the top plate 1 drives the circular plate 201 to lift upward through the first telescopic rod 202. The circular plate 201 drives the three sliders 205 to lift upward. The three sliders 205 respectively squeeze the inner wall of the conical workpiece 100 through the first balls 206 thereon. The conical workpiece 100 is stressed and lifted upward. Then, control the movement of the overall device by a crane to convey the conical workpiece 100. When the conical workpiece 100 is transported to a suitable position, open the air valve 203 to enable air to enter the inner cavity of the first telescopic rod 202, so that the telescopic end of the first telescopic rod 202 can move. Then, control the top plate 1 to lift upward by a crane. The top plate 1 drives the telescopic end of the first telescopic rod 202 and one end of the three first connecting rods 204 to lift upward. The telescopic end of the first telescopic rod 202 is stressed and extends. The three first connecting rods 204 are stressed and respectively apply a pulling force to the corresponding sliders 205, thereby causing the three sliders 205 to drive the corresponding first balls 206 to move closer to each other and reset. When the telescopic end of the first telescopic rod 202 is completely reset, the top plate 1 drives the overall device to lift upward through the first telescopic rod 202, so that the overall device is away from the conical workpiece 100, thus completing the transportation work of the conical workpiece 100 in the first state.,

[0042] In the second state, the larger-diameter end of the conical workpiece 100 is placed upward. Initially, the first tension spring is in a contracted state, the three second telescopic rods 209 are in a state of moving away from each other, there is a gap between the first toothed plate 404 and the adjacent second toothed plate 405, the vertical surface of the first wedge block 504 is in contact with the vertical surface of the adjacent C-shaped frame 208, and the C-shaped frame 208 is restricted and cannot move. First, control the overall device to move above the conical workpiece 100 through a crane and make the circular plate 201 roughly coincide with the center of the conical workpiece 100. Then, control the overall device to descend through the crane, so that the three third balls 401 are in contact with the top end of the conical workpiece 100. It should be noted that the diameter of the circular plate 201 is smaller than the inner diameter of the larger-diameter end of the conical workpiece 100. At this time, the circular plate 201 will not contact the conical workpiece 100, thereby preventing the circular plate 201 from blocking the conical workpiece 100 during the hoisting of the conical workpiece 100, which is not convenient for the staff to observe. Moreover, the distance between the three second telescopic rods 209 is relatively large. During the descent of the overall device, the gap between the three second telescopic rods 209 can facilitate the passage of the conical workpiece 100. At this time, the top plate 1 continues to descend under the influence of its own weight and applies a downward pulling force to the three sliding rods 207 through the three first tension springs respectively. It should be noted that at this time, the top of the vertical plate 303 is not in contact with the bottom end of the corresponding sliding rod 207. After the sliding rod 207 is stressed, the third ball 401 provides support for the short shaft 301 through the L-shaped pipe 302. The L-shaped pipe 302 and the short shaft 301 are lifted upward relative to the sliding rod 207. The short shaft 301 slides in the vertical groove of the corresponding sliding rod 207, the first compression spring is stressed and contracts, and the L-shaped pipe 302 drives the special-shaped plate 402 thereon to squeeze the outer wall of the horizontal shaft of the adjacent first toothed plate 404. The horizontal shaft is stressed and slides horizontally along the sliding groove of the mounting box 403, and drives the first toothed plate 404 to slide horizontally toward the side close to the adjacent second toothed plate 405. The second tension spring is stressed and extends. Subsequently, the first toothed plate 404 meshes with the adjacent second toothed plate 405, thereby enabling the circular plate 201 to stop descending and remain stable relative to the three L-shaped pipes 302. At the same time, the L-shaped pipe 302 drives the first protruding shaft thereon to squeeze the bottom of the adjacent pressing plate 802. The pressing plate 802 is stressed and rotates around the connection of the L-shaped plate 801, and squeezes the top of the adjacent contact rod 804. The contact rod 804 is stressed and drives the telescopic end of the adjacent elastic telescopic shaft 803 to extend. At this time, the telescopic ends of the three elastic telescopic shafts 803 extend simultaneously, so that the three second telescopic rods 209 synchronously descend. Since the three sliding rods 207 cannot descend at this time, when the top plate 1 continues to descend, the first compression spring contracts to the limit, the short shaft 301 provides support for the adjacent sliding rod 207, the sliding rod 207 slides upward relative to the top plate 1, the first tension spring is stressed and extends, and the top plate 1 simultaneously applies a thrust to the three first connecting rods 204 and the three second connecting rods 501. After the three first connecting rods 204 are stressed, they repeat the above steps to achieve the same effect.After the three second linkages 501 are stressed, they respectively apply thrusts to the corresponding sliding brackets 5012. After the sliding brackets 5012 are stressed, they slide horizontally along the surface of the cross plate 5011. At this time, the three sliding brackets 5012 all move closer to each other and drive the first elastic telescopic rod 502 to move. Since the C-shaped frame 208 is restricted and cannot move at this time, the sliding bracket 5012 moves horizontally relative to the corresponding C-shaped frame 208, and the telescopic end of the first elastic telescopic rod 502 is stressed and extends. Subsequently, the sliding bracket 5012 contacts and presses against the bottom of the adjacent second wedge block 505. The second wedge block 505 is stressed and drives the first wedge block 504 to slide upward by means of the sliding plate 503. After the first wedge block 504 slides upward, it no longer contacts the adjacent C-shaped frame 208. After the C-shaped frame 208 is released from the restriction, it can move. The telescopic end of the first elastic telescopic rod 502 quickly contracts and drives the corresponding C-shaped frame 208 to slide horizontally. The C-shaped frame 208 drives the locking block 603 to move horizontally through the connecting rod 602, and drives the second telescopic rod 209 and the second elastic telescopic rod 901 thereon to move. After the locking block 603 moves, it no longer contacts the adjacent unlocking block 701. After the locking block 603 is released from the restriction, the connecting rod 602 can move. The third tension spring contracts and drives the locking block 603 to move horizontally through the connecting rod 602. Subsequently, the inclined surface of the locking block 603 close to the rectangular block 601 contacts and presses against the outer wall of the adjacent rectangular block 601. The locking block 603 drives the connecting rod 602 to slide horizontally, and the third tension spring is stressed and extends until the locking block 603 is aligned with the wedge-shaped groove of the rectangular block 601. The third tension spring contracts and drives the locking block 603 to move horizontally through the connecting rod 602. After the locking block 603 moves, it is snapped into the wedge-shaped groove of the rectangular block 601. The rectangular block 601 can limit the locking block 603 through the wedge-shaped groove, thereby preventing the three C-shaped frames 208 from moving. When the three C-shaped frames 208 lift the conical workpiece 100 subsequently, the three C-shaped frames 208 can stably clamp the conical workpiece 100. At this time, the top surfaces of the corners of the three C-shaped frames 208 close to the elastic telescopic shaft 803 are attached to the bottom surface of the upper protrusion of the conical workpiece 100. After the second elastic telescopic rod 901 moves, the telescopic end of the second elastic telescopic rod 901 is squeezed and contracted by the outer wall of the corresponding sliding rod 207. The air in the inner cavity of the second elastic telescopic rod 901 enters the airbag 902 and then enters the inner cavity of the corresponding second telescopic rod 209 through the hose, causing the telescopic end of the second telescopic rod 209 to extend. After the telescopic end of the second telescopic rod 209 extends and contacts the bottom surface, the telescopic end of the second telescopic rod 209 is blocked and cannot continue to extend. The remaining air accumulates in the airbag 902, causing the airbag 902 to expand. Then the air valve 203 is closed, so that the telescopic end of the first telescopic rod 202 cannot extend, thereby preventing the gap between the top plate 1 and the circular plate 201 from changing. Thus, the hoisting and positioning work of the conical workpiece 100 in the second state is completed.

[0043] Then, the crane is used to control the upward lifting of the overall device, thereby causing the top plate 1 and the circular plate 201 to lift upward. The three second toothed plates 405 on the circular plate 201 respectively apply upward forces to the adjacent first toothed plates 404. The first toothed plates 404 drive the adjacent sliding rods 207 to lift upward through the mounting boxes 403. The sliding rods 207 drive the corresponding U-shaped frames 208 to lift upward. The U-shaped frames 208 drive the second telescopic rods 209 to lift upward through the elastic telescopic shafts 803. And the three U-shaped frames 208 respectively apply forces to the bottom surface of the upper protrusion of the conical workpiece 100. The conical workpiece 100 is forced to lift upward. At this time, the distance between the second telescopic rod 209 and the ground increases, and the airbag 902 gradually contracts. The air in the airbag 902 enters the inner cavity of the adjacent second telescopic rod 209 through the hose. The telescopic ends of the three second telescopic rods 209 gradually extend. When the telescopic ends of the second telescopic rods 209 are fully extended, the electromagnet 1002 is started. The electromagnet 1002 exerts a repulsive force on the magnetic block of the adjacent elastic limit pin 1001, causing the elastic limit pin 1001 to slide to the side away from the electromagnet 1002. After the elastic limit pin 1001 slides, it snaps into the limit groove at the telescopic end of the second telescopic rod 209, thereby limiting the telescopic end of the second telescopic rod 209 to prevent the telescopic end of the second telescopic rod 209 from moving under external forces. Subsequently, the crane is used to control the movement of the overall device, causing the conical workpiece 100 in the second state to move above the conical workpiece 100 in the first state, and causing the overall device to descend. The three U-shaped frames 208 drive the conical workpiece 100 to descend. Subsequently, the telescopic end of one of the second telescopic rods 209 contacts the outer wall of the conical workpiece 100 in the first state. The telescopic end of the second telescopic rod 209 is squeezed by the outer wall of the conical workpiece 100, and drives the adjacent U-shaped frame 208 to move through the elastic telescopic shaft 803. The U-shaped frame 208 drives the locking block 603 to move through the connecting rod 602 therein. The locking block 603 squeezes the inner wall of the wedge-shaped groove of the adjacent rectangular block 601. The rectangular block 601 is forced to drive the top plate 1 to be pulled or pushed through the corresponding sliding frame 5012 and the second connecting rod 501, so that the centers of the top plate 1 and the conical workpiece 100 in the first state tend to be consistent. The top plate 1 can drive the circular plate 201 to move through the first telescopic rod 202, so that the centers of the circular plate 201 and the conical workpiece 100 in the first state tend to be consistent. Until the telescopic ends of the other two second telescopic rods 209 both contact the outer wall of the conical workpiece 100 in the first state, and the above steps are repeated to achieve the same effect. At this time, the centers of the two conical workpieces 100 in different states coincide, and the smaller diameter ends of the two conical workpieces 100 in different states are abutted. Then the electromagnet 1002 is turned off. The electromagnet 1002 no longer exerts a repulsive force on the magnetic block of the adjacent elastic limit pin 1001. The elastic limit pin 1001 contracts and slides back to its original position, and disengages from the limit groove at the telescopic end of the second telescopic rod 209. After the telescopic end of the second telescopic rod 209 is released from the restriction, it can move. Then the air valve 203 is opened, and the crane is used to drive the top plate 1 to lift upward.When the top plate 1 is lifted, it drives the telescopic end of the first telescopic rod 202 to extend and reset, and drives one end of the three first connecting rods 204 and the three second connecting rods 501 to lift upward. The first connecting rod 204 repeats the above steps and achieves the same effect. When the second connecting rod 501 is lifted upward, it exerts a pulling force on the adjacent sliding frame 5012, causing the three sliding frames 5012 to move horizontally away from each other. The sliding frame 5012 drives the first elastic telescopic rod 502 thereon to move. The telescopic end of the first elastic telescopic rod 502 drives the C-shaped frame 208 to slide and reset. The C-shaped frame 208 drives the corresponding second telescopic rod 209 and the second elastic telescopic rod 901 to move and reset. During the process of the second elastic telescopic rod 901 moving and resetting, the distance between the fixed end of the second elastic telescopic rod 901 and the adjacent sliding rod 207 increases, and the telescopic end of the second elastic telescopic rod 901 gradually extends. The air in the inner cavity of the corresponding second telescopic rod 209 is pumped into the inner cavity of the second elastic telescopic rod 901 through the airbag 902 and the hose, so that the telescopic end of the second telescopic rod 209 contracts and resets. Subsequently, the locking block 603 contacts the inclined surface of the unlocking block 701. The unlocking block 701 squeezes the locking block 603. The locking block 603 drives the connecting rod 602 to slide horizontally under the force, and the third tension spring extends under the force. After the locking block 603 moves, it disengages from the wedge-shaped groove of the rectangular block 601 to complete the reset. Subsequently, the three first tension springs all contract and reset. The top plate 1 continues to lift upward, and drives the three sliding rods 207 to lift upward through the three first tension springs respectively. The gap between the sliding rod 207 and the corresponding L-shaped pipe 302 increases. The first compression spring gradually releases and resets, and drives the corresponding short shaft 301 to slide and reset. The first protruding shaft of the L-shaped pipe 302 no longer squeezes the bottom of the pressing plate 802. After the pressing plate 802 is released from the restriction, the telescopic end of the adjacent elastic telescopic shaft 803 can move. The telescopic end of the elastic telescopic shaft 803 contracts to drive the corresponding second telescopic rod 209 to contract and reset. At the same time, the special-shaped plate 402 no longer squeezes the horizontal axis of the first toothed plate 404. After the horizontal axis is released from the restriction, the first toothed plate 404 can move. The second tension spring contracts to drive the first toothed plate 404 to slide and reset. After the first toothed plate 404 is reset, it no longer contacts the adjacent second toothed plate 405. Thus, the overall device completes the hoisting and reset work of the two-state conical workpiece 100.,

[0044] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A positioning device for crane hoisting, comprising a top plate (1), characterized in that: It further includes a first positioning mechanism. The first positioning mechanism includes a circular plate (201). The circular plate (201) is arranged on the lower side of the top plate (1). A first telescopic rod (202) is fixedly connected to the top of the circular plate (201). The telescopic end of the first telescopic rod (202) is fixedly connected to the bottom of the top plate (1). An air valve (203) is installed on the outer wall of the fixed end of the first telescopic rod (202). A number of first connecting rods (204) evenly distributed are hinged to the bottom of the top plate (1). A number of through grooves evenly distributed are formed in the top of the circular plate (201). A sliding block (205) is slidably connected in each of the through grooves. One end of the first connecting rod (204) is hinged to the sliding block (205). A first ball (206) is rollingly connected to one side of the sliding block (205). It further includes a second positioning mechanism. The second positioning mechanism includes a sliding rod (207). A number of the sliding rods (207) evenly distributed are slidably connected to the top of the top plate (1) in a penetrating manner. A first tension spring is arranged between each of the sliding rods (207) and the top plate (1). A U-shaped frame (208) is slidably sleeved on the outer wall of each of the sliding rods (207). A second telescopic rod (209) is arranged on the lower side of the U-shaped frame (208).

2. A crane hoisting positioning device according to claim 1, characterized in that: The second positioning mechanism further includes a short shaft (301). Vertical grooves are formed in the bottoms of a number of the sliding rods (207). The short shaft (301) is slidably connected in the vertical grooves. A first compression spring is arranged between the short shaft (301) and the inner wall of the vertical groove. L-shaped tubes (302) are arranged on the lower sides of a number of the sliding rods (207). A first sliding groove is formed at the top end of the L-shaped tube (302). The bottom end of the short shaft (301) is snapped into the first sliding groove and slides therein. A second compression spring is arranged between the short shaft (301) and the inner wall of the first sliding groove. A vertical plate (303) is fixedly connected to the top end of the L-shaped tube (302). A second ball (304) is rollingly connected to one end of the L-shaped tube (302).

3. A positioning device for crane hoisting according to claim 2, characterized in that: The second positioning mechanism further includes a third ball (401). The third ball (401) is rollingly connected to the bottom end of the L-shaped tube (302). A special-shaped plate (402) is fixedly connected to the outer wall of the L-shaped tube (302). Installation boxes (403) are fixedly connected to the outer walls of a number of the sliding rods (207). A first toothed plate (404) is slidably connected in the installation box (403). A second tension spring is arranged between the first toothed plate (404) and the inner wall of the installation box (403). A sliding groove is formed in the outer wall of the installation box (403) in a penetrating manner. A cross shaft that cooperates with the special-shaped plate (402) is fixedly connected to the outer wall of the first toothed plate (404). One end of the cross shaft is snapped into the sliding groove and slides therein. A number of second toothed plates (405) evenly distributed are fixedly connected to the outer wall of the circular plate (201). The first toothed plate (404) cooperates with the second toothed plates (405).

4. A positioning device for crane hoisting according to claim 1, characterized in that: It further includes a delay mechanism, and the delay mechanism includes a second connecting rod (501). A plurality of uniformly distributed second connecting rods (501) are hinged to the bottom of the top plate (1). Transverse plates (5011) are fixedly sleeved on the outer walls of a plurality of the sliding rods (207). The U-shaped frame (208) is slidably connected to the bottom of the transverse plate (5011). A sliding frame (5012) is slidably sleeved on the outer wall of the transverse plate (5011). One end of the second connecting rod (501) is hinged to the sliding frame (5012). A first elastic telescopic rod (502) is fixedly connected to the bottom of the sliding frame (5012) in a penetrating manner. The telescopic end of the first elastic telescopic rod (502) is fixedly connected to the U-shaped frame (208). A U-shaped groove is formed in the bottom of the transverse plate (5011) in a penetrating manner. A sliding plate (503) is slidably connected to the inner wall of the U-shaped groove. A first wedge-shaped block (504) which is used in cooperation with the U-shaped frame (208) is fixedly connected to the bottom of the sliding plate (503). The first wedge-shaped block (504) is inserted into the U-shaped groove of the transverse plate (5011) and slides therein.

5. A crane hoisting positioning device according to claim 4, characterized in that: The delay mechanism further includes a second wedge-shaped block (505). The second wedge-shaped block (505) is fixedly connected to the bottom of the sliding plate (503). The second wedge-shaped block (505) is used in cooperation with the sliding frame (5012). The second wedge-shaped block (505) is inserted into the U-shaped groove of the transverse plate (5011) and slides therein.

6. A crane hoisting positioning device according to claim 5, characterized in that: The delay mechanism further includes a rectangular block (601). The rectangular block (601) is fixedly connected to the bottom of the sliding frame (5012). A connecting rod (602) is slidably connected to the inner wall of the U-shaped frame (208). A third tension spring is arranged between the connecting rod (602) and the inner wall of the U-shaped frame (208). A locking block (603) is fixedly connected to the outer wall of the connecting rod (602). A wedge-shaped groove which is used in cooperation with the locking block (603) is formed in one side of the rectangular block (601).

7. A crane-mounted positioning device according to claim 6, characterized in that: It further includes an unlocking block (701). The unlocking block (701) is fixedly connected to the bottom of the transverse plate (5011). The unlocking block (701) is used in cooperation with the locking block (603).

8. The positioning device for crane hoisting according to claim 3, characterized in that: It further includes an extension mechanism. The extension mechanism includes an L-shaped plate (801). The L-shaped plates (801) are fixedly connected to the outer walls of a plurality of the sliding rods (207). An extrusion plate (802) is hinged to one side of the L-shaped plate (801). A first protruding shaft which is used in cooperation with the extrusion plate (802) is fixedly connected to the outer wall of the L-shaped tube (302). An elastic telescopic shaft (803) is fixedly connected to the bottom of the U-shaped frame (208). The fixed end of the second telescopic rod (209) is fixedly connected to the telescopic end of the elastic telescopic shaft (803). A contact rod (804) which is used in cooperation with the extrusion plate (802) is fixedly connected to the telescopic end of the elastic telescopic shaft (803).

9. A crane-mounted positioning device according to claim 8, characterized in that: The extension mechanism further includes a second elastic telescopic rod (901). One side of the U-shaped frame (208) is fixedly connected through the second elastic telescopic rod (901). The telescopic end of the second elastic telescopic rod (901) is slidably connected to the outer wall of the sliding rod (207). An airbag (902) is communicated with the outer wall of the fixed end of the second elastic telescopic rod (901). A hose is commonly communicated between the airbag (902) and the second telescopic rod (209).

10. A crane-mounted positioning device according to claim 9, characterized in that: It further includes an elastic limit pin (1001). A cylindrical groove is formed in the inner wall of the fixed end of the second telescopic rod (209). The elastic limit pin (1001) is slidably connected in the cylindrical groove, and an electromagnet (1002) is fixedly installed. A limit groove for cooperating with the elastic limit pin (1001) is formed in the outer wall of the telescopic end of the second telescopic rod (209). One end of the elastic limit pin (1001) is fixedly connected with a magnetic block.

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