A lifting wire rope stabilizing motion system for field crane

Abstract

The present invention discloses a stable motion system for hoisting steel wire ropes for field bridges, including a trolley frame and a hoisting device frame; a connecting support is arranged at each of the four ends of the upper surface of the hoisting device frame, and the connecting support includes a movable support and a T-frame; an anti-sway mechanism for controlling the swing amplitude of the T-frame is arranged on each movable support; a steel wire rope is connected to each steel wire rope connector; when the T-frame is horizontal, two steel wire ropes between two steel wire rope connectors on each T-frame and respective corresponding hoisting pulleys form two waists of an isosceles trapezoid; the four isosceles trapezoids where the steel wire ropes on the four T-frames are located remain congruent when the T-frame is in a horizontal state. The present invention forms four basically congruent isosceles trapezoids with stable motion functions on the four front, back, left and right surfaces. When a trolley or a trolley is moving and braking, the four basically congruent isosceles trapezoids act like four mechanical arms, which can reduce the swing amplitude of the hoisting device, the hoisting device frame and the container during container operation.

Description

Technical Field

[0001] The invention belongs to the technical field of cranes, and in particular relates to a hoisting steel wire rope stabilizing motion system for a field bridge. Background Art

[0002] A yard crane is a type of port machinery, which refers to a bridge-type handling equipment used in the cargo stacking area and is used for infield handling; among them, yard cranes generally include rail-mounted container cranes and tire-mounted container cranes.

[0003] The yard crane adopts the crane lifting wire rope system when lifting or unloading containers. The crane lifting wire rope system usually includes a lifting wire rope drum and a sling frame. The lifting wire rope drum is wound with wire rope, and the end of the wire rope is connected to the sling frame. When in use, the sling frame and the sling are connected to the container, and the lifting wire rope drum rotates to realize the winding or loosening of the wire rope, thereby realizing the lifting or lowering of the container.

[0004] However, when the current crane lifting wire rope system brakes during travel, the sling carrying the container is prone to swing due to inertia, resulting in inaccurate positioning of the stacked cargo. The driver spends more time in the process of aligning the containers, resulting in a lower loading and unloading rate. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a lifting wire rope stabilizing motion system for a field bridge.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A lifting wire rope stabilizing motion system for a field crane comprises a trolley frame and a sling upper frame located below the trolley frame;

[0008] A connecting support is provided at each of the four ends of the upper surface of the sling upper frame, and the connecting support includes a movable support connected to the sling upper frame, a T-frame is provided on the upper part of the movable support, and wire rope connectors are symmetrically provided at both ends of the upper part of the T-frame; the top of the movable support is hingedly connected to the bottom of the T-frame; each movable support is provided with an anti-sway mechanism for controlling the swing amplitude of the T-frame;

[0009] The two steel wire rope connectors on the T-shaped frames at the left and right ends of the upper frame of the sling are distributed along the front-to-back direction, and the two steel wire rope connectors on the T-shaped frames at the front and rear ends of the upper frame of the sling are distributed along the left-to-right direction;

[0010] Each wire rope connector is connected to a wire rope, and the other end of each wire rope passes upward over the respective lifting pulley and is wound around the lifting drum; the lifting pulley and the lifting drum are both arranged on the trolley frame;

[0011] When the T-frame is horizontal, the two steel wire ropes between the two steel wire rope connectors on each T-frame and the corresponding lifting pulleys form two waists of an isosceles trapezoid; the two isosceles trapezoids on the two opposite T-frames are symmetrically arranged, and the angle between the isosceles trapezoids on the left and right T-frames and the plumb plane extending in the front-to-back direction is equal to the angle between the isosceles trapezoids on the front and rear T-frames and the plumb plane extending in the left-to-right direction; the four isosceles trapezoids on the four T-frames remain congruent when the T-frame is in a horizontal state.

[0012] Preferably, the central axis of the lifting drum extends in the front-rear direction;

[0013] The central axis of the lifting pulley connected to the steel wire ropes on the left and right ends of the T-shaped frames of the sling upper frame extends in the left and right directions;

[0014] The central axis of the lifting pulley connected to the steel wire rope on the T-shaped frames at the front and rear ends of the upper frame of the sling extends in the front-to-back direction;

[0015] The steel wire ropes connected to the T-shaped frames at the left and right ends of the upper frame of the sling are passed upwards over the respective lifting pulleys and the respective guide pulleys in turn and then wound around the lifting drum;

[0016] The guide pulley is arranged on the trolley frame.

[0017] Preferably, the steel wire rope connected to the left steel wire rope connector on the T-shaped frame at the front and rear ends of the sling upper frame and the steel wire rope connected to the two steel wire rope connectors on the T-shaped frame at the left end of the sling upper frame have the same winding direction on the lifting drum;

[0018] The winding directions of the steel wire ropes connected to the right steel wire rope connectors on the T-shaped frames at the front and rear ends of the hoisting device and the steel wire ropes connected to the two steel wire rope connectors on the T-shaped frames at the right end of the hoisting device are consistent on the lifting drum.

[0019] Preferably, the anti-sway mechanism includes a controller, two lifting cylinders and two tension sensors;

[0020] Bases are symmetrically arranged at both ends of the side wall of the movable support, and the bottom ends of the two lifting oil cylinders are fixedly arranged on the bases on both sides respectively; the piston rods of the two lifting oil cylinders correspond to the two ends of the T-shaped frame respectively;

[0021] Two tension sensors are respectively arranged on two steel wire rope connectors of the T-frame, and the other end of the tension sensor is connected to the corresponding steel wire rope;

[0022] Both tension sensors are communicatively connected with the controller;

[0023] The controller receives the tension values ​​measured by the two tension sensors and calculates the difference between the two tension values;

[0024] When the tension values ​​measured by the two tension sensors in the same anti-sway mechanism are both greater than the first set value and the absolute value of the difference between the two tension values ​​is greater than the second set value, the piston rod of the lifting cylinder on the same side as the tension sensor with the smaller measured tension value extends upward and rests on the bottom end of the corresponding side of the T-frame.

[0025] Preferably, a rubber pad is provided at the top end of the piston rod of the jacking cylinder.

[0026] Preferably, a crossbeam is provided at the position where the movable support is provided on the upper frame of the sling, and the bottoms of both ends of the crossbeam are hinged to the upper frame of the sling through hinge shafts;

[0027] The cross beams at the left and right ends of the upper frame of the sling extend in the front-to-back direction; the bottoms of the cross beams at the left and right ends of the upper frame of the sling are provided with slide rails extending in the front-to-back direction;

[0028] The cross beams at the front and rear ends of the sling frame extend in the left-right direction; the bottoms of the cross beams at the front and rear ends of the sling frame are provided with slide rails extending in the left-right direction;

[0029] The bottom of the movable support is provided with a sliding block which cooperates with the sliding rail at the bottom of the corresponding beam;

[0030] A screw rod is disposed at one end of the crossbeam, and a motor is disposed at the end of the screw rod;

[0031] A nut threadedly connected to the lead screw is arranged inside the movable support.

[0032] Preferably, the lifting drum is provided as one, and the lifting drum is located in the middle of the trolley frame;

[0033] The winding directions of eight steel wire ropes connected by four T-shaped frames on the upper frame of the sling are consistent on the lifting drum.

[0034] Preferably, the lifting drums are provided in two and are arranged in parallel on the left and right sides;

[0035] The steel wire rope connected to the left steel wire rope connector on the T-shaped frame at the front and rear ends of the sling upper frame and the steel wire rope connected to the two steel wire rope connectors on the T-shaped frame at the left end of the sling upper frame are wound around the lifting drum on the left side;

[0036] The steel wire rope connected to the right steel wire rope connector on the T-shaped frame at the front and rear ends of the sling frame and the steel wire rope connected to the two steel wire rope connectors on the T-shaped frame at the right end of the sling frame are wound around the lifting drum on the right side.

[0037] The beneficial effects of the present invention are:

[0038] (1) The winding method of the steel wire rope in the stable motion system of the hoisting steel wire rope for the field bridge of the present invention is that when the T-frame is horizontal, four congruent isosceles trapezoids with stable motion functions are formed on the four planes of front, back, left and right. The waist of the trapezoid is the steel wire rope connecting the hoisting pulley on the trolley frame and the steel wire rope connector on the hoisting device frame. The four isosceles trapezoids remain congruent during the rotation of the hoisting drum, and the height of the plumb bob caused by the change in waist length is also consistent, thereby ensuring the consistency of the height of the four ends of the hoisting device frame and achieving smooth ascent or descent. When the crane is braking during the travel of the trolley or the trolley, the four congruent isosceles trapezoids are like four mechanical arms, through mutual geometric constraints, Firmly locking the spreader frame can reduce the swing amplitude of the spreader, spreader frame and container during container operation, shorten the stacking or transshipment cycle of each container, and ultimately achieve the purpose of improving operation efficiency; and when the spreader frame is loaded, when the T-frame swings, due to the setting of the anti-sway mechanism, the swing angle range of the T-frame is within the swing range allowed during the lifting process. Therefore, when the T-frame swings and is not in a horizontal state, the four trapezoids can be identified as four approximate isosceles trapezoids within the engineering error range. These four trapezoids remain basically congruent during the rotation of the lifting drum, so the swing amplitude of the container can also be reduced within the engineering error range.

[0039] (2) The arrangement of the movable support, the crossbeam and the screw rod in the lifting wire rope stable motion system for the yard crane of the present invention realizes the micro-translation of the upper frame of the sling in the front-to-back direction, the micro-translation in the left-to-right direction and the micro-rotation function, thereby playing the role of adjusting the upper frame position of the sling, which can ensure the rapid alignment of the containers during loading and unloading, and improve the operation efficiency of loading and unloading containers. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0041] Figure 1 It is a schematic top view of the structure of the lifting wire rope stabilizing motion system for the midfield bridge in Example 1 of the present invention;

[0042] Figure 2 It is a schematic front view of the structure of the lifting wire rope stabilizing motion system for the midfield bridge in Example 1 of the present invention;

[0043] Figure 3 Schematic diagram of the winding principle of the steel wire rope in the stable motion system of the lifting steel wire rope for the midfield bridge in Embodiment 1 of the present invention;

[0044] Figure 4 It is a schematic top view of the structure of the lifting wire rope stabilizing motion system for the midfield bridge in Example 2 of the present invention;

[0045] Figure 5 It is a schematic front view of the structure of the lifting wire rope stabilizing motion system for the midfield bridge in Example 2 of the present invention;

[0046] Figure 6 Schematic diagram of the winding principle of the steel wire rope in the stable motion system of the lifting steel wire rope for the midfield bridge in Embodiment 2 of the present invention;

[0047] Figure 7 It is a schematic diagram of the structure of the T-shaped frame in the present invention;

[0048] in,

[0049] 1-trolley frame, 2-hoisting device frame, 3-movable support, 301-base, 4-T-frame, 401-wire rope connector, 5-wire rope, 6-lifting pulley, 7-lifting drum, 8-guide pulley, 9-crossbeam, 901-articulated shaft, 10-motor, 11-lifting cylinder, 12-tension sensor, 13-rubber pad. DETAILED DESCRIPTION

[0050] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] In the present invention, the directions or positional relationships indicated by terms such as "front", "rear", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and should not be understood as limitations on the present invention.

[0053] In the present invention, terms such as "connected" and "connection" should be understood in a broad sense, indicating that the connection can be fixed, integral or detachable; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meaning of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0054] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0055] Embodiment 1:

[0056] like Figure 1-3 As shown, a lifting wire rope stabilizing motion system for a field crane comprises a trolley frame 1 and a hoisting device upper frame 2 located below the trolley frame 1;

[0057] The four ends of the upper surface of the sling upper frame 2 are each provided with a connecting support. Figure 7 As shown, the connecting support includes a movable support 3 connected to the upper frame 2 of the sling, a T-frame 4 is arranged on the upper part of the movable support 3, and wire rope connectors 401 are symmetrically arranged at both ends of the upper part of the T-frame 4; the top of the movable support 3 is hingedly connected to the bottom of the T-frame 4; each movable support is provided with an anti-sway mechanism for controlling the swing amplitude of the T-frame 4, and the setting of the anti-sway mechanism constrains the swing amplitude of the T-frame 4 when the upper frame 2 of the sling is loaded, thereby solving the problem that the two wire ropes 5 connected to the T-frame 4 are subjected to unbalanced forces and cause the T-frame 4 to swing greatly. Once the T-frame 4 swings greatly, it will destroy the formation of the isosceles trapezoid, so that the upper frame 2 of the sling will swing when the trolley or car is walking and braking;

[0058] The two steel wire rope connectors 401 on the T-shaped frames at the left and right ends of the upper frame 2 of the sling are distributed along the front-to-back direction, and the two steel wire rope connectors 401 on the T-shaped frames at the front and rear ends of the upper frame 2 of the sling are distributed along the left-to-right direction;

[0059] Each wire rope connector 401 is connected to a wire rope 5, and the other end of each wire rope 5 passes upward over the respective lifting pulley 6 and is wound on the lifting drum 7; the lifting pulley 6 and the lifting drum 7 are both arranged on the trolley frame 1;

[0060] When the T-frame 4 is horizontal, the two steel wire ropes 5 between the two steel wire rope connectors 401 on each T-frame 4 and the respective corresponding lifting pulleys 6 form two waists of an isosceles trapezoid, that is, when the T-frame 4 is horizontal, the two steel wire rope connectors 401 on each T-frame 4, the lifting pulleys 6 corresponding to the corresponding steel wire rope connectors 401, and the two steel wire ropes 5 between the steel wire rope connectors 401 and the respective corresponding lifting pulleys 6 form an isosceles trapezoid; the two isosceles trapezoids where the steel wire ropes on the two opposite T-frames 4 are located are symmetrically arranged, and the angle between the isosceles trapezoids where the steel wire ropes on the left and right T-frames 4 are located and the plumb plane extending in the front and rear directions is equal to the angle between the isosceles trapezoids where the steel wire ropes on the front and rear T-frames 4 are located and the plumb plane extending in the left and right directions; the four isosceles trapezoids where the steel wire ropes on the four T-frames 4 are located remain congruent when the T-frame is in a horizontal state. This arrangement is to ensure that when the waist lengths of the four isosceles trapezoids change in unison, the heights of the plumb bobs caused by the waist length changes are also consistent, thereby ensuring the consistency of the heights of the four ends of the sling upper frame 2 and achieving a smooth rise or fall.

[0061] During the specific installation process, the angle between the isosceles trapezoid where the steel rope is located on the left and right T-frames 4 and the plumb plane extending in the front-to-back direction, and the angle between the isosceles trapezoid where the steel rope is located on the front and rear T-frames 4 and the plumb plane extending in the left-to-right direction are usually set to 0, that is, the left and right isosceles trapezoids are located on the two plumb planes extending in the front-to-back direction, and the front and rear isosceles trapezoids are located on the two plumb planes extending in the left-to-right direction.

[0062] After the eight steel ropes 5 are wound in this way, when the T-frame 4 is in a horizontal position, four congruent isosceles trapezoids with stable movement functions are formed on the four faces of front, back, left and right. The waist of the trapezoid is the steel rope connecting the lifting pulley 6 on the trolley frame 1 and the steel rope connector 401 on the sling frame 2. The four isosceles trapezoids remain congruent during the rotation of the lifting drum 7, and the height of the plumb bob caused by the change in waist length is also consistent, thereby ensuring the consistency of the height of the four ends of the sling frame 2 and achieving a smooth rise or fall; therefore, when the trolley or car is moving and braking, the four congruent isosceles trapezoids, like four mechanical arms, firmly lock the sling frame 2 through mutual geometric constraints, which can reduce the shaking amplitude of the sling, the sling frame 2 and the container during container operation, shorten the stacking or transshipment cycle of each container, and ultimately achieve the purpose of improving operating efficiency.

[0063] When the sling upper frame 2 is under load, when the T-frame 4 swings, due to the setting of the anti-sway mechanism, the swing angle range of the T-frame 4 is adjusted to the allowed swing range through the tension sensor and the controller. Therefore, when the T-frame 4 swings and is not in a horizontal state, the four trapezoids can be identified as four approximate isosceles trapezoids within the engineering error range. These four trapezoids basically remain congruent during the rotation of the lifting drum 7, so the amplitude of the container shaking can also be reduced within the engineering error range.

[0064] Preferably, the central axis of the lifting drum 7 extends in the front-rear direction;

[0065] The central axis of the lifting pulley 6 connected to the steel wire rope 5 on the T-shaped frame at the left and right ends of the sling upper frame 2 extends in the left-right direction; there are four lifting pulleys 6 with central axes extending in the left-right direction, which are distributed on the front and rear sides of the left and right ends of the trolley frame 1;

[0066] The central axis of the lifting pulley 6 connected to the steel wire rope 5 on the T-shaped frame at the front and rear ends of the upper frame 2 of the sling extends in the front-to-back direction; there are four lifting pulleys 6 with the central axis extending in the front-to-back direction, which are distributed on the left and right sides of the trolley frame 1 and are located on the inner side of the lifting pulley 6 with the central axis extending in the left-right direction;

[0067] The steel wire ropes 5 connected to the T-shaped frames at the left and right ends of the upper frame 2 of the sling are passed over the respective lifting pulleys 6 and the respective guide pulleys 8 in turn and then wound around the lifting drum 7; wherein there are four guide pulleys 8 in total and they are located on the inner side of the lifting pulley 6 whose central axis extends in the left-right direction;

[0068] The guide pulley 8 is arranged on the trolley frame 1 , and the direction of the guide pulley 8 can be set as long as it can guide the wire rope 5 so that it is easy to be wound on the lifting drum 7 .

[0069] The arrangement of each lifting pulley 6 and each guide pulley 8 in the embodiment 1 of the present application is as follows: Figure 1-2 As shown, their arrangement is to form four congruent isosceles trapezoids when the T-frame 4 is horizontal, but the arrangement of each lifting pulley 6 and each guide pulley 8 is not limited to Figure 1-2 The method shown in the figure only requires that the winding of the wire rope can form four congruent isosceles trapezoids.

[0070] Preferably, the steel wire rope 5 connected to the left steel wire rope connector 401 on the T-shaped frame at the front and rear ends of the sling upper frame 2 and the steel wire rope 5 connected to the two steel wire rope connectors 401 on the T-shaped frame at the left end of the sling upper frame 2 are wound in the same direction on the lifting drum 7;

[0071] The winding directions of the steel wire rope 5 connected to the right steel wire rope connector 401 on the T-shaped frames at the front and rear ends of the sling frame 2 and the steel wire rope 5 connected to the two steel wire rope connectors 401 on the T-shaped frames at the right end of the sling frame 2 are consistent on the lifting drum 7.

[0072] Preferably, the anti-sway mechanism includes a controller, two lifting cylinders 11 and two tension sensors 12;

[0073] The two ends of the side wall of the movable support 3 are symmetrically provided with bases 301, and the bottom ends of the two lifting cylinders 11 are fixedly provided on the bases 301 on both sides respectively; the piston rods of the two lifting cylinders 11 correspond to the two ends of the T-shaped frame 4 up and down respectively;

[0074] Two tension sensors 12 are respectively arranged on two steel wire rope connectors 401 of the T-shaped frame 4, and the other end of the tension sensor 12 is connected to the corresponding steel wire rope 5 to detect the tension exerted on the steel wire rope 5;

[0075] Both tension sensors 12 are in communication connection with the controller;

[0076] The controller receives the tension values ​​measured by the two tension sensors 12 and calculates the difference between the two tension values;

[0077] When the tension values ​​measured by the two tension sensors 12 in the same anti-sway mechanism are both greater than the first set value and the absolute value of the difference between the two tension values ​​is greater than the second set value, the piston rod of the jacking oil cylinder 11 located on the same side as the tension sensor 12 with the smaller tension value extends upward to abut against the bottom end of the corresponding side of the T-frame 4 and lifts the T-frame 4 to a horizontal state. The controller is connected to the jacking oil cylinder, and the controller controls the action of the piston rod of the jacking oil cylinder 11 according to the tension values ​​measured by the two tension sensors 12 received.

[0078] like Figure 7 As shown, the tension sensor 12 at the left end and the lifting cylinder 11 at the left end are located on the same side; the tension sensor 12 at the right end and the lifting cylinder 11 at the right end are located on the same side;

[0079] Specifically, the first setting value is related to the tension on the steel wire rope 5 when the hoisting frame 2 is unloaded (i.e., no container is hoisted). Generally, the first setting value can be set to: 1.5 times the average tension on the steel wire rope 5 when the hoisting frame 2 is unloaded;

[0080] The second set value is determined according to the actual situation on site and the required anti-sway degree. Among them, when the difference in tension between the two steel wire ropes 5 connected to the same T-frame 4 is greater, the swing angle of the T-frame 4 is greater; when the T-frame 4 is allowed to swing clockwise or counterclockwise in the field operation, the angle range is -a°~a°, then when the T-frame 4 rotates to -a° or a°, the absolute value of the difference in tension between the two steel wire ropes 5 is m, then in order to ensure that the T-frame 4 can only swing within the range of -a°~a°, when it is detected that the absolute value of the difference in the two tensions is greater than m, the controller in this application will control the corresponding lifting cylinder 11 to move and lift the corresponding side of the T-frame 4 to a horizontal state. The angle range of -a° to a° mentioned above is determined according to the site requirements, and the value of m can be determined according to the actual measurement on site. Specifically, according to the anti-sway requirements on site, the angle range allowing the T-frame 4 to swing clockwise or counterclockwise is usually set to -2° to 2°, and the corresponding m value is 3T, where 3T refers to the gravity value of a 3-ton weight;

[0081] Specifically, when the sling frame 2 is unloaded, the tension on the two steel wire ropes on the T-frame 4 will not be greater than the first set value. At this time, the two lifting cylinders 11 will not move, that is, when the sling frame 2 is unloaded, the T-frame 4 can swing freely to adapt to the situation of uneven force on the steel wire ropes;

[0082] When the load is placed on the hoisting frame 2 (i.e., a container is hoisted), the tension on the two steel wire ropes on the T-frame 4 is greater than the first set value. Once the swing of the T-frame 4 exceeds the allowable angle range, the controller controls the corresponding lifting cylinder 11 to operate and lift the T-frame 4 to a horizontal state, as follows:

[0083] (1) When the absolute value of the difference between the two pulling force values ​​is less than the second set value, the two lifting cylinders 11 do not move. At this time, the T-frame 4 swings appropriately within the allowed angle range to adapt to the uneven force on the wire rope and prevent the wire rope from being damaged by excessive force and affecting its life;

[0084] (2) When the absolute value of the difference between the two tension values ​​is greater than the second set value, and the tension value measured by the tension sensor 12 at the left end is greater than the tension value measured by the tension sensor 12 at the right end, the T-frame 4 will swing clockwise beyond the allowed angle range. At this time, the controller controls the piston rod of the right-end lifting cylinder 11 to extend, and lift the T-frame to a horizontal state, which is convenient for normal box loading operation;

[0085] (3) When the absolute value of the difference between the two tension values ​​is greater than the second set value, and the tension value measured by the tension sensor 12 at the right end is greater than the tension value measured by the tension sensor 12 at the left end, the T-frame 4 will swing counterclockwise beyond the allowed angle range. At this time, the controller controls the piston rod of the left-end lifting cylinder 11 to extend, lifting the T-frame to a horizontal state to facilitate normal box placement operations.

[0086] Therefore, the present application realizes that when the sling frame 2 is unloaded, the T-frame 4 is allowed to swing freely by setting the anti-sway mechanism. When the sling frame 2 is loaded, the T-frame 4 is allowed to swing within the allowed angle range by setting the lifting cylinder 11. On the one hand, the swing amplitude during the lifting process is reduced to achieve smooth lifting and lowering. On the other hand, appropriate swing is allowed to adapt to the uneven force on the wire rope, preventing the wire rope from being damaged by excessive force and affecting its life.

[0087] Preferably, a rubber pad 13 is provided at the top end of the piston rod of the jacking cylinder 11 to protect the bottom end surface of the T-frame 4.

[0088] Preferably, a crossbeam 9 is provided at the position where the movable support 3 is provided on the upper frame 2 of the sling, and the bottoms of both ends of the crossbeam 9 are hinged to the upper frame 2 of the sling through hinge shafts 901;

[0089] The cross beams 9 at the left and right ends of the hanger upper frame 2 extend in the front-to-back direction; the bottoms of the cross beams 9 at the left and right ends of the hanger upper frame 2 are provided with slide rails extending in the front-to-back direction;

[0090] The cross beams 9 at the front and rear ends of the sling frame 2 extend in the left-right direction; the bottoms of the cross beams 9 at the front and rear ends of the sling frame 2 are provided with slide rails extending in the left-right direction;

[0091] The bottom of the movable support 3 is provided with a slider that cooperates with the bottom slide rail of the corresponding beam 9;

[0092] A screw rod is disposed at one end of the crossbeam 9, and a motor 10 is disposed at the end of the screw rod;

[0093] The movable support 3 is internally provided with a nut threadedly connected to the screw rod.

[0094] The motor 10 drives the screw to rotate. Under the sliding limit cooperation between the slider at the bottom of the movable support 3 and the slide rail at the bottom of the beam 9 and the thread cooperation between the screw and the nut, when the screw rotates, relative movement between the movable support 3 and the upper frame 2 of the sling is realized.

[0095] Preferably, the lifting drum 7 is configured as one, such as Figure 1-3 As shown, the lifting drum 7 is located in the middle of the trolley frame 1;

[0096] The winding directions of the eight steel wire ropes 5 connected to the four T-shaped frames on the upper frame 2 of the sling are consistent on the lifting drum 7.

[0097] Such a winding method can achieve: when the lifting drum 7 rotates, the eight steel ropes 5 can be tightened or loosened synchronously.

[0098] At this time, the directions of the four guide pulleys 8 are as follows: Figure 1-2 As shown, the central axis of the two guide pulleys 8 on the left side extends in the vertical direction, and the two steel wire ropes 5 on the left end T-frame are guided by their respective guide pulleys 8 on the left side and then wound counterclockwise from the bottom of the lifting drum 7, while the steel wire ropes on the left side of the front and rear end T-frames are also wound counterclockwise from the bottom of the lifting drum 7 after passing over their respective lifting pulleys 6; the central axis of the two guide pulleys 8 on the right end has a certain angle with the vertical direction, so that the two steel wire ropes 5 on the right end T-frame are guided by their respective guide pulleys 8 on the right side and then wound counterclockwise from the top of the lifting drum 7, while the steel wire ropes 5 on the right side of the front and rear end T-frames are also wound counterclockwise from the top of the lifting drum 7 after passing over their respective lifting pulleys 6. At this time, when the lifting drum 7 rotates counterclockwise, the hoisting device upper frame 2 rises.

[0099] At the same time, the guide pulleys 8 on the left and right sides can be swapped, so that the two steel wire ropes 5 on the left T-frame and the steel wire ropes 5 on the left side of the front and rear T-frames are wound clockwise from the top of the lifting drum 7, and the two steel wire ropes 5 on the right T-frame and the steel wire ropes 5 on the right side of the front and rear T-frames are wound clockwise from the bottom of the lifting drum 7. At this time, when the lifting drum 7 rotates clockwise, the sling upper frame 2 rises.

[0100] A lifting wire rope stabilizing motion system for a field crane, the specific implementation method of which is as follows:

[0101] (1) Reduce the shaking amplitude of the lifting device during the lifting process

[0102] By rotating the lifting drum 7, the eight steel ropes 5 will be tightened or loosened synchronously to realize the rising or falling of the sling frame 2, and the tightened or loosened lengths of the eight steel ropes 5 are consistent, so that the four approximately isosceles trapezoids remain basically congruent during the rotation of the lifting drum 7; therefore, when the truck or car is moving and braking, the four basically congruent isosceles trapezoids, like four mechanical arms, firmly lock the sling frame 2 through mutual geometric constraints, which can minimize the shaking amplitude of the sling, the sling frame 2 and the container during container operation, shorten the stacking or transshipment period of each container, and ultimately achieve the purpose of improving operating efficiency.

[0103] (2) Micro-movement of the upper frame 2 in the front and rear directions

[0104] Start the motors 10 at the left and right ends of the hoist frame 2 to rotate the corresponding screw rods to apply force to the movable support 3. Due to the action of the T-frame 4 on the movable support 3 and the connected wire rope, the position of the movable support 3 remains unchanged. Under the reaction force of the movable support 3 and the cooperation between the slider on the movable support 3 and the slide rail on the beam 9, the beam 9 and the hoist frame 2 achieve micro-translation in the front and rear directions.

[0105] (3) Micro-movement of the upper frame 2 in the left and right directions

[0106] Start the motors 10 at the front and rear ends of the hoist frame 2 to rotate the corresponding screw rods to apply force to the movable support 3. Due to the action of the T-frame 4 on the movable support 3 and the connected wire rope, the position of the movable support 3 remains unchanged. Under the reaction force of the movable support 3 and the cooperation between the slider on the movable support 3 and the slide rail on the beam 9, the beam 9 and the hoist frame 2 achieve micro-translation in the left and right directions.

[0107] (4) Lifting device upper frame 2 micro-rotation

[0108] Through the coordinated action of the four motors 10 and the four lead screws, the hanger upper frame 2 can be rotated clockwise or counterclockwise.

[0109] Among them, the setting of the movable support 3, the crossbeam 9, and the screw rod in the present application realizes the micro-translation of the spreader frame 2 in the front and rear directions, the micro-translation in the left and right directions, and the micro-rotation function, thereby playing a role in adjusting the position of the spreader frame 2, which can ensure rapid alignment of containers during loading and unloading, and improve the operation efficiency of loading and unloading containers.

[0110] Embodiment 2:

[0111] The difference from the embodiment 1 is that the lifting drum 7 is provided in two and is arranged in parallel on the left and right sides. Figure 4-6 As shown;

[0112] The steel wire rope 5 connected to the left steel wire rope connector 401 on the T-shaped frame at the front and rear ends of the sling upper frame 2 and the steel wire rope 5 connected to the two steel wire rope connectors 401 on the left end T-shaped frame of the sling upper frame 2 are wound on the left lifting drum 7;

[0113] The steel wire rope 5 connected to the right steel wire rope connector 401 on the T-shaped frames at the front and rear ends of the sling upper frame 2 and the steel wire rope 5 connected to the two steel wire rope connectors 401 on the T-shaped frames at the right end of the sling upper frame 2 are wound around the lifting drum 7 on the right side.

[0114] The remaining technical features are the same as those in Example 1.

[0115] In Example 2, the winding directions of the two steel wire ropes 5 on the left end T-frame and the steel wire ropes 5 on the left side of the front and rear end T-frames and the winding directions of the two steel wire ropes 5 on the right end T-frame and the steel wire ropes 5 on the right side of the front and rear end T-frames can be the same or different.

[0116] When the winding directions are the same, for example, the four steel ropes 4 on one side rotate counterclockwise from the bottom of the lifting drum 7, and the four steel ropes 4 on the other side rotate counterclockwise from the top of the lifting drum 7. At this time, the two lifting drums 7 rotate in the same direction, so that the eight steel ropes can be tightened or loosened synchronously, thereby realizing the rising or falling of the sling frame 2.

[0117] When the winding direction is different, e.g. Figure 6 As shown, the four steel wire ropes 4 on the left side rotate counterclockwise from the bottom of the lifting drum 7, and the four steel wire ropes 4 on the right side rotate clockwise from the bottom of the lifting drum 7. At this time, the two lifting drums 7 rotate in different directions, so that the eight steel wire ropes can be tightened or loosened synchronously, thereby realizing the rising or falling of the sling frame 2.

[0118] When the spreader frame 2 is raised or lowered, the two lifting drums 7 are controlled to rotate to ensure that the eight steel ropes are tightened or loosened synchronously; at the same time, the linear speeds of the two lifting drums 7 are made the same to ensure that the eight steel ropes 5 are tightened or loosened to the same length, so that the four approximately isosceles trapezoids remain basically congruent during the rotation of the lifting drums 7; therefore, when the truck or car is moving and braking, the four basically congruent isosceles trapezoids, like four mechanical arms, firmly lock the spreader frame 2 through mutual geometric constraints, which can reduce the shaking amplitude of the spreader, the spreader frame 2 and the container during container operation, shorten the stacking or transshipment period of each container, and ultimately achieve the purpose of improving operating efficiency.

[0119] In the second embodiment, the micro-motion translation of the upper frame 2 of the sling in the front-to-back direction, the micro-motion translation of the upper frame 2 of the sling in the left-to-right direction, and the micro-motion rotation operation of the upper frame 2 of the sling are the same as those in the first embodiment.

[0120] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not a limitation of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the protection scope of the present invention.

Claims

1. A lifting wire rope stabilizing motion system for a field crane, comprising a trolley frame and a sling upper frame located below the trolley frame; its characteristics are: A connecting support is provided at each of the four ends of the upper surface of the sling upper frame, and the connecting support includes a movable support connected to the sling upper frame, a T-frame is provided on the upper part of the movable support, and wire rope connectors are symmetrically provided at both ends of the upper part of the T-frame; the top of the movable support is hingedly connected to the bottom of the T-frame; each movable support is provided with an anti-sway mechanism for controlling the swing amplitude of the T-frame; The two steel wire rope connectors on the T-shaped frames at the left and right ends of the upper frame of the sling are distributed along the front-to-back direction, and the two steel wire rope connectors on the T-shaped frames at the front and rear ends of the upper frame of the sling are distributed along the left-to-right direction; Each wire rope connector is connected to a wire rope, and the other end of each wire rope passes upward over the respective lifting pulley and is wound around the lifting drum; the lifting pulley and the lifting drum are both arranged on the trolley frame; When the T-frame is horizontal, the two steel wire ropes between the two steel wire rope connectors on each T-frame and the corresponding lifting pulleys form two waists of an isosceles trapezoid; the two isosceles trapezoids where the steel wire ropes on the two opposite T-frames are located are symmetrically arranged, and the angle between the isosceles trapezoids where the steel wire ropes on the left and right T-frames are located and the plumb plane extending in the front-to-back direction is equal to the angle between the isosceles trapezoids where the steel wire ropes on the front and rear T-frames are located and the plumb plane extending in the left-to-right direction; the four isosceles trapezoids where the steel wire ropes on the four T-frames are located remain congruent when the T-frame is in a horizontal state; The central axis of the lifting drum extends in the front-rear direction; The central axis of the lifting pulley connected to the steel wire ropes on the left and right ends of the T-shaped frames of the sling upper frame extends in the left and right directions; The central axis of the lifting pulley connected to the steel wire rope on the T-shaped frames at the front and rear ends of the upper frame of the sling extends in the front-to-back direction; The steel wire ropes connected to the T-shaped frames at the left and right ends of the upper frame of the sling are passed upwards over the respective lifting pulleys and the respective guide pulleys in turn and then wound around the lifting drum; The guide pulley is arranged on the trolley frame; The anti-sway mechanism includes a controller, two lifting cylinders and two tension sensors; Bases are symmetrically arranged at both ends of the side wall of the movable support, and the bottom ends of the two lifting oil cylinders are fixedly arranged on the bases on both sides respectively; the piston rods of the two lifting oil cylinders correspond to the two ends of the T-shaped frame respectively; Two tension sensors are respectively arranged on two steel wire rope connectors of the T-frame, and the other end of the tension sensor is connected to the corresponding steel wire rope; Both tension sensors are communicatively connected with the controller; The controller receives the tension values ​​measured by the two tension sensors and calculates the difference between the two tension values; When the tension values ​​measured by the two tension sensors in the same anti-sway mechanism are both greater than the first set value and the absolute value of the difference between the two tension values ​​is greater than the second set value, the piston rod of the lifting cylinder on the same side as the tension sensor with the smaller measured tension value extends upward and rests on the bottom end of the corresponding side of the T-frame.

2. The hoisting wire rope stabilizing motion system for field bridge according to claim 1 is characterized in that: The winding directions of the steel wire rope connected to the left steel wire rope connector on the T-shaped frame at the front and rear ends of the sling upper frame and the steel wire rope connected to the two steel wire rope connectors on the T-shaped frame at the left end of the sling upper frame on the lifting drum are consistent; The winding directions of the steel wire ropes connected to the right steel wire rope connectors on the T-shaped frames at the front and rear ends of the sling frame and the steel wire ropes connected to the two steel wire rope connectors on the T-shaped frames at the right end of the sling frame on the lifting drum are consistent.

3. The hoisting wire rope stabilizing motion system for field bridge according to claim 1 is characterized in that: A rubber pad is arranged on the top end of the piston rod of the jacking oil cylinder.

4. The hoisting wire rope stabilizing motion system for field bridge according to claim 1 is characterized in that: A crossbeam is provided at the position where the movable support is provided on the upper frame of the sling, and the bottoms of both ends of the crossbeam are hinged to the upper frame of the sling through hinge shafts; The cross beams at the left and right ends of the upper frame of the sling extend in the front-to-back direction; the bottoms of the cross beams at the left and right ends of the upper frame of the sling are provided with slide rails extending in the front-to-back direction; The cross beams at the front and rear ends of the sling frame extend in the left-right direction; the bottoms of the cross beams at the front and rear ends of the sling frame are provided with slide rails extending in the left-right direction; The bottom of the movable support is provided with a sliding block which cooperates with the sliding rail at the bottom of the corresponding beam; A screw rod is disposed at one end of the crossbeam, and a motor is disposed at the end of the screw rod; A nut threadedly connected to the lead screw is arranged inside the movable support.

5. The hoisting wire rope stabilizing motion system for field cranes according to any one of claims 1 to 4, characterized in that: The lifting drum is provided as one, and the lifting drum is located in the middle of the trolley frame; The winding directions of eight steel wire ropes connected by four T-shaped frames on the upper frame of the sling are consistent on the lifting drum.

6. The hoisting wire rope stabilizing motion system for field cranes according to any one of claims 1 to 4, characterized in that: The lifting drums are provided in two and are arranged in parallel on the left and right sides; The steel wire rope connected to the left steel wire rope connector on the T-shaped frame at the front and rear ends of the sling upper frame and the steel wire rope connected to the two steel wire rope connectors on the T-shaped frame at the left end of the sling upper frame are wound around the lifting drum on the left side; The steel wire rope connected to the right steel wire rope connector on the T-shaped frame at the front and rear ends of the sling frame and the steel wire rope connected to the two steel wire rope connectors on the right end T-shaped frame of the sling frame are wound around the lifting drum on the right side.

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