Four-plate hook variable hook distance spreader

Abstract

The invention discloses a four-plate hook variable hook distance sling, comprising a crossbeam, an axis, a plate hook variable hook distance mechanism, a plate hook holding mechanism, and a plate hook device, wherein the four axes are symmetrically arranged relative to the central axis of the crossbeam; two sets of plate hook variable hook distance mechanisms are symmetrically arranged on both sides of the crossbeam and include a power source, a driving member, a variable hook distance connecting rod, and a movable arm, wherein the movable arm includes a first crank, a first cylinder, a second crank, and a second cylinder; four sets of plate hook devices are symmetrically arranged relative to the central axis of the crossbeam and include a nut, a bearing, a lifting fork, a plate hook shaft, a plate hook, an axis connecting rod, an intermediate connecting rod connecting the lifting fork connecting rod and the axis connecting rod, a lifting fork connecting rod, and a second crank to form a plate hook holding mechanism of a parallel four-link mechanism. The invention changes the current situation that a crane can only lift a tundish or material box of one specification. By changing the hook distance of the plate hook, a crane can lift tundishes or material boxes of various specifications, which can save investment for steel enterprises and fill the technical gap of the four-plate hook sling variable hook distance.

Description

Technical Field

[0001] The invention belongs to the technical field of lifting and transportation, and in particular relates to a four-plate hook variable hook distance sling. Background Art

[0002] Cranes are mechanical equipment used to lift, transport, load and unload or install materials. In particular, tundish cranes and material box cranes are widely used in the metallurgical industry. Figure 1 As shown in (a), (b) and (c), in the prior art, a fixed four-plate hook sling is generally used to lift the tundish or material box 104. The fixed four-plate hook sling is mainly composed of a crossbeam 101, a lifting fork 102, and a plate hook 103. Since the positions of the lifting fork 102 and the plate hook 103 on the crossbeam 101 are fixed, the hook spacings A and B remain constant, and thus the lifting area defined by the hook spacings A and B is constant, so only one specification of tundish or material box 104 can be lifted. However, in actual production operations, many steel companies have the need to use the same crane to lift tundishes or material boxes 104 of different specifications, but current technology cannot meet this demand.

[0003] Therefore, providing a four-plate hook variable hook distance sling that can overcome the deficiencies in the above-mentioned prior art has become a technical problem that technical personnel in the field urgently need to solve. Summary of the invention

[0004] To achieve the above object, the present invention provides a four-plate hook variable hook distance sling, comprising: a crossbeam, an axis, a plate hook variable hook distance mechanism, a plate hook holding mechanism, and a plate hook device, wherein:

[0005] The four shafts are fixed to the crossbeam, the four shafts are symmetrically arranged relative to the central axis of the crossbeam, and a shaft connecting rod is integrally formed on each shaft;

[0006] Two sets of the plate hook variable hook distance mechanism are symmetrically arranged on both sides of the crossbeam, and each set of the plate hook variable hook distance mechanism includes a power source, a driving component, a variable hook distance connecting rod, and a movable arm. The driving component is transmission-matched with the power source, the variable hook distance connecting rod is hinged to the driving component, and the movable arm includes a first crank, a first cylinder, a second crank, and a second cylinder that are welded together to form a rigid component. The first crank is hinged to the variable hook distance connecting rod, and the first cylinder is sleeved on the shaft and can rotate around the shaft.

[0007] The four sets of plate hook devices are symmetrically arranged relative to the central axis of the crossbeam, and each set of the plate hook devices includes a nut, a bearing, a lifting fork, a plate hook shaft, and a plate hook. The lifting fork is inserted and installed in the second cylinder, the upper end of the lifting fork is threadedly connected to the nut, the bearing is installed between the nut and the second cylinder, the lower part of the lifting fork is connected to the plate hook through the plate hook shaft, and a lifting fork connecting rod is arranged on the lifting fork, and the lifting fork connecting rod and the shaft connecting rod are connected to each other via an intermediate connecting rod, wherein the lifting fork connecting rod is hinged to one end of the intermediate connecting rod, and the shaft connecting rod is hinged to the other end of the intermediate connecting rod;

[0008] The shaft connecting rod, the intermediate connecting rod, the fork connecting rod and the second crank form a parallel four-bar linkage mechanism, wherein the fork connecting rod is parallel to the shaft connecting rod, the intermediate connecting rod is parallel to the second crank, and the parallel four-bar linkage mechanism constitutes the plate hook holding mechanism.

[0009] Furthermore, in the above-mentioned four-plate hook variable hook distance sling, the first cylinder rotates around the axis to form a first hinge point, the relative rotation of the second cylinder and the fork forms a second hinge point, the shaft connecting rod and the middle connecting rod are hinged to form a third hinge point, the fork connecting rod and the middle connecting rod are hinged to form a fourth hinge point, and the center lines of the first hinge point, the second hinge point, the third hinge point, and the fourth hinge point form a parallelogram.

[0010] Furthermore, in the above-mentioned four-plate hook variable hook distance sling, the power source is a threaded pair composed of a screw rod and a nut, a gear rack pair, or an electro-hydraulic push rod or other devices.

[0011] Furthermore, in the above-mentioned four-plate hook variable hook distance sling, the driving component is a slider that is transmission-coordinated with the power source.

[0012] Furthermore, in the above-mentioned four-plate hook variable hook distance sling, the driving component is a gear that is transmission-matched with the power source, or a piston or a push rod that performs linear reciprocating motion.

[0013] Furthermore, in the above-mentioned four-plate hook variable hook distance sling, the number of the power sources is two, and each power source synchronously drives two sets of plate hook devices located on one side of the crossbeam.

[0014] Furthermore, in the above-mentioned four-plate hook variable hook distance sling, the power source is equipped with a limit switch and has a self-locking function.

[0015] Furthermore, in the above-mentioned four-plate hook variable hook distance hoist, the power source drives the driving component to reciprocate linearly along the crossbeam, and the driving force is transmitted to the first cylinder via the variable hook distance connecting rod and the first crank. The first cylinder rotates around the axis, and the second crank also rotates around the axis accordingly. The second cylinder rotates accordingly with the second crank. Through the relative rotation between the lifting fork and the second cylinder and the parallelism between the lifting fork connecting rod and the axis connecting rod, the lifting fork connecting rod performs translational motion, driving the lifting fork and then driving the plate hook to translate, so that the position of the plate hook device changes, thereby changing the hook distance of the plate hooks of the four sets of plate hook devices, while the plate hook body always maintains a balanced state.

[0016] The four-plate hook variable hook distance sling of the present invention changes the current situation that one crane can only lift tundishes or material boxes of one specification. By using the four-plate hook variable hook distance sling of the present invention, one crane can lift tundishes or material boxes of various specifications by changing the hook distance of the plate hooks, which can save investment for steel companies and fill the technical gap of variable hook distance of four-plate hook slings. It has leading technology and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0018] Figure 1 The present invention is a schematic diagram of the structure of a fixed four-plate hook spreader in the prior art, wherein (a) is a front view of the fixed four-plate hook spreader, (b) is a side view of the fixed four-plate hook spreader, and (c) is a schematic diagram of a tundish or a material box being lifted;

[0019] FIG2 is a schematic structural diagram of a four-plate hook variable hook distance spreader of the present invention, wherein (a) is a front view of the four-plate hook variable hook distance spreader, (b) is a side view of the four-plate hook variable hook distance spreader, and (c) is a top view of the four-plate hook variable hook distance spreader;

[0020] Figure 3 It is a structural diagram of the plate hook variable hook distance mechanism and the plate hook holding mechanism in the four-plate hook variable hook distance sling of the present invention;

[0021] Figure 4 It is a structural diagram of the central axis and the axis connecting rod of the four-plate hook variable hook distance sling of the present invention;

[0022] Figure 5 It is a structural diagram of the movable arm in the four-plate hook variable hook distance sling of the present invention;

[0023] Figure 6 It is a structural diagram of the lifting fork and the lifting fork connecting rod in the four-plate hook variable hook distance lifting device of the present invention;

[0024] Figure 7 It is a structural schematic diagram of the middle plate hook device of the four-plate hook variable hook distance sling of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] As shown in (a), (b) and (c) of Figure 2, the four-plate hook variable hook distance sling of the present invention mainly includes a crossbeam 1, an axis 2, a plate hook variable hook distance mechanism 3, a plate hook holding mechanism 4, and a plate hook device 5.

[0027] The four shafts 2 are fixed to the cross beam 1 through the shaft end baffles. The four shafts 2 are symmetrically arranged relative to the central axis of the cross beam 1. Each shaft 2 is integrally formed with a shaft connecting rod 2.1, see Figure 4 As shown in the simple diagram.

[0028] Two sets of hook distance changing mechanisms 3 are symmetrically arranged on the left and right sides of the crossbeam 1. Each set of hook distance changing mechanisms 3 includes a power source 3.4, a driving member 3.1, a hook distance changing connecting rod 3.2, and a movable arm 3.3. The driving member 3.1 is coupled to the power source 3.4 through transmission, and the hook distance changing connecting rod 3.2 is hinged to the driving member 3.1. Figure 5 As shown in the schematic diagram, the movable arm 3.3 includes a first crank 3.3.1, a first cylinder 3.3.2, a second crank 3.3.3, and a second cylinder 3.3.4, which are welded together at a specific angle to form a rigid component. The first crank 3.3.1 is hinged to the variable hook distance connecting rod 3.2, and the first cylinder 3.3.2 is sleeved on the shaft 2 and can rotate around the shaft 2. The power source 3.4 drives the driving member 3.1 to reciprocate in a straight line along the left and right directions of the crossbeam 1, thereby driving the variable hook distance connecting rod 3.2 to rotate, and then drives the first crank 3.3.1 to rotate, the first cylinder 3.3.2 to rotate around the shaft 2, the second crank 3.3.3 to rotate, and the second cylinder 3.3.4 to rotate.

[0029] The four sets of plate hook devices 5 are symmetrically arranged relative to the central axis of the crossbeam 1. Figure 7Each set of plate hook device 5 includes a nut 5.1, a bearing 5.2, a lifting fork 5.3, a plate hook shaft 5.4, and a plate hook 5.5. The lifting fork 5.3 is inserted into the second cylinder 3.3.4 of the movable arm 3.3, and the upper end of the lifting fork 5.3 is threadedly connected to the nut 5.1, the bearing 5.2 is installed between the nut 5.1 and the second cylinder 3.3.4, and the lower part of the lifting fork 5.3 is connected to the plate hook 5.5 through the plate hook shaft 5.4. Figure 6 As shown in the schematic diagram, the fork 5.3 is provided with a fork connecting rod 5.3.1. Figure 3 The fork link 5.3.1 and the shaft link 2.1 of the shaft 2 are connected to each other via the intermediate link 4.1, wherein the fork link 5.3.1 is hinged to one end of the intermediate link 4.1, and the shaft link 2.1 is hinged to the other end of the intermediate link 4.1.

[0030] Combined with reference Figure 3 In the above-mentioned four-plate hook variable hook distance sling, the first cylinder 3.3.2 of the movable arm 3.3 rotates around the axis 2 to form a first hinge point O1, the second cylinder 3.3.4 of the movable arm 3.3 and the fork 5.3 inserted and installed in the second cylinder 3.3.4 rotate relative to each other to form a second hinge point O2, the shaft connecting rod 2.1 on the axis 2 is hinged to the middle connecting rod 4.1 to form a third hinge point O3, and the fork connecting rod 5.3.1 on the fork 5.3 is hinged to the middle connecting rod 4.1 to form a fourth hinge point O4. The center lines of the hinge points O1, O2, O3, and O4 form a parallelogram, that is, the axial connecting rod 2.1 of the shaft 2, the intermediate connecting rod 4.1, the fork connecting rod 5.3.1 of the fork 5.3, and the second crank 3.3.3 of the movable arm 3.3 form a parallel four-bar linkage, wherein the fork connecting rod 5.3.1 is parallel to the axial connecting rod 2.1, the intermediate connecting rod 4.1 is parallel to the second crank 3.3.3, and the parallel four-bar linkage constitutes the plate hook retaining mechanism 4 of the four-plate hook variable hook distance sling of the present invention.

[0031] Therefore, in the above-mentioned four-plate hook variable hook distance sling, the third hinge point O3 and the fourth hinge point O4 are just ordinary hinge points, and their hinge shafts only hinge the two adjacent connecting rods, namely the shaft connecting rod 2.1 and the middle connecting rod 4.1, and the fork connecting rod 5.3.1 and the middle connecting rod 4.1 together, and have no other functions. The first hinge point O1 and the second hinge point O2 are composite hinge points, and their hinge shaft bodies, namely the shaft 2 and the fork 5.3, have the function of connection, and the parts derived from the hinge shaft body, namely the shaft connecting rod 2.1 and the fork connecting rod 5.3.1, are also the main components of the parallel four-bar mechanism of the plate hook holding mechanism 4. Moreover, the first hinge point O1 is in a core position in the plate hook variable hook distance mechanism 3, because the first hinge point O1 is a fixed hinge point, and is also the common rotation center of the plate hook variable hook distance mechanism 3 and the plate hook holding mechanism 4, and is also the node hub for power transmission between the plate hook variable hook distance mechanism 3 and the plate hook holding mechanism 4.

[0032] As described above, when the power source 3.4 drives the driving member 3.1 to reciprocate in a straight line along the left and right directions of the beam 1, the driving force is transmitted to the first cylinder 3.3.2 via the variable hook distance connecting rod 3.2 and the first crank 3.3.1, and the first cylinder 3.3.2 rotates around the axis 2, and the second crank 3.3.3 also rotates around the axis 2 accordingly, and the second cylinder 3.3.4 rotates accordingly with the second crank 3.3.3. Since the shaft connecting rod 2.1, the intermediate connecting rod 4.1, the fork connecting rod 5.3.1, and the second crank 3.3.3 form a parallel four-bar linkage, the fork connecting rod 5.3.1 remains parallel to the shaft connecting rod 2.1, and since the fork 5.3 is inserted and installed in the second cylinder 3.3.4, the two can rotate relative to each other. Therefore, when the second cylinder 3.3.4 rotates, the basic characteristics of the parallel four-bar linkage are achieved through the relative rotation between the fork 5.3 and the second cylinder 3.3.4 and the fork connecting rod 5.3.1 remaining parallel to the shaft connecting rod 2.1. The fork connecting rod 5.3.1 only makes a translational movement but does not rotate. The translational movement of the fork connecting rod 5.3.1 drives the fork 5.3 and then drives the plate hook 5.5 connected to the fork 5.3 through the plate hook shaft 5.4 to translate, so that the position of the plate hook device 5 changes. As a result, the hook distances of the plate hooks 5.5 of the four sets of plate hook devices 5 change. At the same time, it is ensured that the plate hooks 5.5 only translate but do not rotate during the change of the hook distance, and the plate hook bodies always maintain a balanced state and always remain parallel to each other, so as to ensure that the plate hooks can smoothly hang the middle bag or material box.

[0033] As a specific implementation, the power source 3.4 can be a threaded pair consisting of a screw nut, or a gear rack pair, an electro-hydraulic push rod, etc., as long as it can achieve linear reciprocating motion, and its specific form is not limited.

[0034] As a specific implementation, the number of power sources 3.4 can be one, two or more. Preferably, the number of power sources 3.4 is two, and each power source 3.4 synchronously drives two sets of plate hook devices 5 located on one side of the beam 1 to translate.

[0035] Preferably, the power source 3.4 is equipped with a limit switch having a self-locking function.

[0036] Preferably, the driving member 3.1 is a slider that is transmission-matched with the power source 3.4, or it can be a gear that is transmission-matched with the power source 3.4, or a piston or a push rod that performs linear reciprocating motion.

[0037] As mentioned above, the four-plate hook variable hook distance sling of the present invention generally has the characteristics of central axis symmetry. Figure 3 Taking the plate hook device in part I of Figure 2(c) as an example, the working principle and working process of the four-plate hook variable hook distance spreader are briefly explained. The implementation methods of the other three sets of plate hook devices are the same, only the directions are symmetrical or opposite.

[0038] The power source 3.4 in the form of a screw-nut pair causes the driving member 3.1 to perform a linear reciprocating motion between positions M and N along the left and right directions of the cross beam 1, i.e., the X-axis direction. The driving member 3.1 drives the variable hook distance connecting rod 3.2, the first crank 3.3.1, and then the first cylinder 3.3.2 to rotate around the axis 2 through a certain angle, and the second crank 3.3.3 also rotates around the axis 2 through the same angle as the first cylinder 3.3.2. Then, through the relative rotation between the fork 5.3 and the second cylinder 3.3.4 and the fork connecting rod 5.3.1 and the shaft connecting rod 2.1 in the parallel four-bar linkage mechanism, the fork connecting rod 5.3.1 is translated, driving the position of the plate hook device 5 to change from S to T. When the plate hook device 5 reaches the predetermined position, the power source 3.4 stops working and is locked, so that the plate hook distance of the plate hook device 5 is changed in the X and Y directions.

[0039] When the driving member 3.1 moves from the M position to the N position under the drive of the power source 3.4, the hook distance of the hook device 5 in the X and Y directions can be changed as follows: A2-A1>0, A2-A1<0, A2-A1=0, B2-B1>0, B2-B1<0, B2-B1=0. Therefore, the four-hook variable hook distance sling of the present invention can realize the following combinations of hook distance changes:

[0040]

[0041] In summary, the four-plate hook variable hook distance sling of the present invention has the following characteristics:

[0042] (1) The four-plate hook variable hook distance sling has a central axis symmetry characteristic, wherein the four axes, two sets of plate hook variable hook distance mechanisms, four sets of plate hook devices, and the plate hook holding mechanism are all symmetrical relative to the central axis of the beam;

[0043] (2) Under the driving action of the power source, the four hooks of the four hook devices are continuously moved simultaneously in the X and Y directions in the horizontal plane, so that the hook distance of the hooks is continuously variable in the X and Y directions;

[0044] (3) During the change of the hook distance, the four hooks always remain parallel and do not rotate;

[0045] (4) The position locking of the plate hook is achieved through the limit stop and self-locking function of the power source;

[0046] (5) The plate hook variable hook distance mechanism and the plate hook holding mechanism have a common rotation center composed of the shaft and the first cylinder.

[0047] Therefore, compared with the prior art, the four-plate hook variable hook distance sling of the present invention has the following advantages and beneficial effects: it changes the current situation that one crane can only lift one specification of tundish or material box. By using the four-plate hook variable hook distance sling of the present invention, by changing the hook distance of the plate hooks, one crane can lift tundishes or material boxes of various specifications, which can save investment for steel enterprises and fill the technical gap of variable hook distance of four-plate hook slings. It has leading technology and broad application prospects.

[0048] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A four-plate hook variable hook distance spreader, characterized in that: The four-plate hook variable hook distance sling comprises a crossbeam, an axis, a plate hook variable hook distance mechanism, a plate hook holding mechanism, and a plate hook device, wherein: The four shafts are fixed to the crossbeam, the four shafts are symmetrically arranged relative to the central axis of the crossbeam, and a shaft connecting rod is integrally formed on each shaft; Two sets of the plate hook variable hook distance mechanism are symmetrically arranged on both sides of the crossbeam, and each set of the plate hook variable hook distance mechanism includes a power source, a driving component, a variable hook distance connecting rod, and a movable arm. The driving component is transmission-matched with the power source, the variable hook distance connecting rod is hinged to the driving component, and the movable arm includes a first crank, a first cylinder, a second crank, and a second cylinder that are welded together to form a rigid component. The first crank is hinged to the variable hook distance connecting rod, and the first cylinder is sleeved on the shaft and can rotate around the shaft. The four sets of plate hook devices are symmetrically arranged relative to the central axis of the crossbeam, and each set of the plate hook devices includes a nut, a bearing, a lifting fork, a plate hook shaft, and a plate hook. The lifting fork is inserted and installed in the second cylinder, the upper end of the lifting fork is threadedly connected to the nut, the bearing is installed between the nut and the second cylinder, the lower part of the lifting fork is connected to the plate hook through the plate hook shaft, and a lifting fork connecting rod is arranged on the lifting fork, and the lifting fork connecting rod and the shaft connecting rod are connected to each other via an intermediate connecting rod, wherein the lifting fork connecting rod is hinged to one end of the intermediate connecting rod, and the shaft connecting rod is hinged to the other end of the intermediate connecting rod; The shaft connecting rod, the intermediate connecting rod, the fork connecting rod and the second crank form a parallel four-bar linkage, wherein the fork connecting rod is parallel to the shaft connecting rod, the intermediate connecting rod is parallel to the second crank, and the parallel four-bar linkage constitutes the plate hook holding mechanism; The first cylinder rotates around the axis to form a first hinge point, the second cylinder and the fork rotate relative to each other to form a second hinge point, the shaft connecting rod and the intermediate connecting rod are hinged to form a third hinge point, the fork connecting rod and the intermediate connecting rod are hinged to form a fourth hinge point, and the center lines of the first hinge point, the second hinge point, the third hinge point, and the fourth hinge point form a parallelogram; The power source drives the driving component to reciprocate along the beam in a straight line, and the driving force is transmitted to the first cylinder via the variable hook distance connecting rod and the first crank. The first cylinder rotates around the axis, and the second crank also rotates around the axis accordingly. The second cylinder rotates accordingly with the second crank. Through the relative rotation between the fork and the second cylinder and the parallelism between the fork connecting rod and the shaft connecting rod, the fork connecting rod performs translational motion, driving the fork and then driving the plate hook to translate, so that the position of the plate hook device changes, thereby changing the hook distance of the plate hooks of the four sets of plate hook devices, while the plate hook body always maintains a balanced state.

2. The four-plate hook variable hook distance sling according to claim 1, characterized in that: The power source is a threaded pair consisting of a screw nut, a gear rack pair or an electro-hydraulic push rod.

3. The four-plate hook variable hook distance sling according to claim 2, characterized in that: The driving component is a slider that is transmission-matched with the power source.

4. The four-plate hook variable hook distance sling according to claim 2, characterized in that: The driving member is a gear that is coupled to the power source, or a piston or a push rod that performs linear reciprocating motion.

5. The four-plate hook variable hook distance spreader according to claim 1, characterized in that: The number of the power sources is two, and each power source synchronously drives two sets of plate hook devices located on one side of the crossbeam.

6. The four-plate hook variable hook distance spreader according to claim 1, characterized in that: The power source is equipped with a limit switch and has a self-locking function.

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