Three-way lifting hook

Abstract

The utility model provides a three-way lifting hook which comprises a hook body and hook heads, the hook heads are arranged at the bottom of the hook body, the number of the hook heads is three, the hook heads are evenly distributed in the circumferential direction of the hook body, connecting ropes are connected to the hook heads, the ends, away from the hook heads, of the connecting ropes are combined into a connector, and the connector is used for being connected with a lifted object; according to the utility model, the lifting stress direction of a hung object is uniform three-direction stress, the triangular stability is realized, the large-amplitude swinging of the lifting hook in the lifting process is avoided, and the stability of the lifting operation is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hooks, in particular to a three-way hook. BACKGROUND

[0002] The crane is a kind of hoisting machinery for vertical lifting and horizontal handling operation, the hook used by the crane at present can be divided into single hook and double hook according to its shape, the stability of the two types of hooks is poor when hoisting operation, the hoisting object hoisted on the above hook will swing, and even fall off from the hook. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application aims to provide a three-way hook to solve the problem of poor stability of the existing hook.

[0004] In order to achieve the above purpose, the present application provides a three-way hook, comprising a hook body and a hook head, the hook head is arranged at the bottom of the hook body, the hook head is provided with three hook heads which are evenly distributed along the circumference of the hook body, a connecting rope is connected to each hook head, and the ends of the connecting ropes away from the hook head are combined into a connecting head, which is used to connect the hoisting object.

[0005] Optionally, the central axis of the hook body coincides with the central axis of the connecting head.

[0006] Optionally, the end of the connecting rope is provided with a thimble, and the thimble is hung on the hook head.

[0007] Optionally, the connecting rope is a steel wire rope.

[0008] Optionally, the hook head comprises a bending part and an upward part, and the cross section of the bending part in the stress direction is a smooth trapezoidal cross section.

[0009] Optionally, the thimble is a smooth trapezoidal thimble, so as to enhance the stability of the thimble on the bending part.

[0010] Optionally, a fixing sleeve is arranged outside the connecting head, so as to enhance the connection stability of the steel wire rope.

[0011] Optionally, an installation thread is arranged at the end of the hook body away from the hook head.

[0012] Optionally, an elastic rope is arranged on the hook body, an anti-falling groove is arranged at the end of the upward part, the end of the elastic rope away from the hook body is arranged in a ring shape, and the ring-shaped end of the elastic rope is hung in the anti-falling groove.

[0013] As can be seen from the above, the three-way hook provided by the application comprises a hook body and hook heads, the hook heads are three, and are uniformly arranged along the circumference of the hook body, so that the lifting stress direction of the hanging object is uniformly three-way stress, with triangular stability, avoiding large swinging of the hook during lifting, ensuring the stability of the hoisting operation, reducing the safety hazard of external uncertain factors, in addition, the hook head is connected with a connecting rope, one end of the connecting rope away from the hook head is twisted into a connecting head, the connecting head is used to connect the hoisting object, the central axis of the hook body coincides with the central axis of the connecting head, the three connecting ropes are arranged in an inverted isosceles triangular pyramid shape in space, the stress of the front end of the three connecting ropes is outward, and the stress of the tail end is inward, avoiding the connecting rope from falling off the hook when the hoisting object is affected by the outside world, and enhancing the safety of the operation site. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the application or related art, the drawings needed to be used in the embodiments or related art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Figure 1 The structure schematic diagram of the hook body is shown for the embodiments of the application;

[0016] Figure 2 The structure schematic diagram of the connecting rope is shown for the embodiments of the application;

[0017] Figure 3 The structure schematic diagram of the hook head is shown for the embodiments of the application;

[0018] Figure 4 The structure schematic diagram of the trapezoidal section is shown for the embodiments of the application;

[0019] Figure 5 The structure schematic diagram of the sleeve ring is shown for the embodiments of the application;

[0020] Figure 6 The structure schematic diagram of the elastic rope is shown for the embodiments of the application.

[0021] The drawings show that: 1, the hook body; 2, the hook head; 3, the connecting rope; 4, the connecting head; 5, the sleeve ring; 6, the fixed sleeve; 7, the elastic rope. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the application more clear, the following will be further described in detail in combination with specific embodiments and with reference to the drawings.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] As mentioned in the background, a crane is a lifting machine used for vertical lifting and horizontal transport operations. Crane hooks, based on their shape, can be divided into single-hook and double-hook types. Both types of hooks have poor stability during lifting operations, lacking both the function of preventing the suspended object from swaying and the function of preventing the connecting rope from detaching from the hook. Traditional single-hook and double-hook structures suffer from unstable and uneven force distribution, making the suspended object susceptible to external airflow, resonance, inertia, and other factors, causing it to sway in the air. If the direction of the connecting rope's sway is consistent with the arc direction of the hook, the connecting rope is also prone to detaching from the hook. Often, only one or two connecting ropes connect the hook and the suspended object, resulting in a single direction of force, which exacerbates the instability of the suspended object's swaying during lifting operations.

[0025] The following is in conjunction with the appendix Figures 1-6 The embodiments of this application will be described in detail below.

[0026] like Figure 1 As shown, a three-way hook includes: a hook body 1 and a hook head 2. The hook head 2 is located at the bottom of the hook body 1. There are three hook heads 2, which are evenly distributed around the hook body 1. Each hook head 2 is connected to a connecting rope 3. The ends of the connecting ropes 3 away from the hook head 2 are combined into a connector 4. The connector 4 is used to connect the object being lifted.

[0027] In addition, the central axis of the hook body 1 coincides with the central axis of the connector 4.

[0028] Specifically, the hook is cast from low-carbon steel, which not only ensures that the hook itself has no deformation, cracks or breakage, but also ensures that the self-weight of the hook is as light as possible; the technical parameters of the hook openings of the three hook heads 2, the hook head curvature, the hook arm length, etc. are completely the same, the line connecting the lowest ends of the three hook head 2 arcs is an equilateral triangle, the diameter of the hook head 2 is set according to the hoisting industry safety standards, the strength of the casting material, and the actual hoisting operation requirements, for example, the diameter of the hook head 2 for light hoisting can be set to 10-20mm; the diameter of the hook head 2 for medium hoisting can be set to 20-40mm; the diameter of the hook head 2 for heavy hoisting can be set to more than 40mm. The hook opening size of the hook head 2 is determined according to the weight of the hoisted object, the size of the object rope and the application environment, and generally the hook opening size is 0.75 times the diameter of the hook head 2. When the three connecting ropes 3 are hung to hoist the object through the connecting heads 4, they are arranged in an inverted isosceles triangular pyramid in space, and the central axis of the hook body 1 coincides with the central axis of the connecting head 4, so as to increase the stability of the hoisted object and the connecting head 4.

[0029] In the present embodiment, the hook includes a hook body 1 and hook heads 2, the hook heads 2 are provided in three and are uniformly arranged along the circumference of the hook body 1, so that the lifting force direction of the hoisted object is uniformly three-directional force, has triangular stability, avoids large-scale swinging of the hook during lifting, ensures the stability of the hoisting operation, reduces the safety hidden danger of external uncertain factors, in addition, the hook heads 2 are each connected with a connecting rope 3, the ends of the connecting ropes 3 away from the hook heads 2 are combined into a connecting head 4, the connecting head 4 is used to connect the hoisted object, the central axis of the hook body 1 coincides with the central axis of the connecting head 4, the three connecting ropes 3 are arranged in an inverted isosceles triangular pyramid in space, the stress of the front end of the three connecting ropes 3 is outward, and the stress of the tail end is inward, which avoids the connecting ropes 3 from falling off the hook when the hoisted object is affected by the outside world, and enhances the safety of the operation site.

[0030] In some embodiments, the end of the hook body 1 away from the hook head 2 is provided with a mounting thread.

[0031] Specifically, the thread profile is set to sawtooth or trapezoidal shape to reduce stress concentration. Let A be the thread root section area, Z be the number of threads, H be the height of the thread, φ be the dynamic coefficient, P be the thread pitch, P Q is the rated lifting capacity of the hook, d is the large diameter of the thread, d1 is the thread root diameter, and d2 is the small diameter of the nut. The height of the nut is determined by the extrusion stress between the threads, and the height H=(1-1.5)d.

[0032] The tensile stress of the thread tail is:

[0033]

[0034] The extrusion stress of the thread tail is:

[0035]

[0036] In the embodiment, the end of the hook body 1 away from the hook head 2 is provided with a mounting thread, so as to fix the lifting hook on the lifting hook beam through a nut, facilitating the installation and disassembly of the lifting hook.

[0037] In some embodiments, as shown in Figure 1 and Figure 2 the end of the connecting rope 3 is provided with a grommet 5 hung on the hook head 2.

[0038] In addition, the connecting rope 3 is a steel wire rope. The steel wire rope is connected to the lifting hook by grommet braiding method, and the twisting characteristics, structural characteristics and mechanical characteristics of the three steel wire ropes are completely the same.

[0039] Specifically, after the upper end of the steel wire rope is wound around the grommet 5, each strand is inserted into the main body of the rope in turn and braided with the main body of the rope, and is tied tightly with a thin steel wire. The bundling length should not be less than (20-25)d, wherein d is the diameter of the steel wire rope, and at the same time, not less than 300mm. The lower end of the steel wire rope, the strands of the three steel wire ropes are alternately twisted, forming a connecting head 4, to ensure that the stranded steel wire rope will not be loose and twisted.

[0040] Stranded steel wire rope tensile stress calculation:

[0041] Let S be the static tension of the stranded steel wire rope, i be the total number of steel wires in the stranded steel wire rope, δ be the diameter of the stranded steel wire, d be the diameter of the stranded steel wire rope, f be the filling coefficient of the stranded steel wire rope, and 1.2 be the coefficient of steel wire spiral angle and stress distribution unevenness.

[0042] The tensile stress of the stranded steel wire rope is:

[0043]

[0044] Combined with the stress characteristics of the three-way lifting hook, the three steel wire ropes are separated by 120°, and the actual stress direction of the steel wire rope will be biased towards the middle hook body. The stress of the three steel wire ropes in work is the same, and the tensile stress of one steel wire rope is calculated. Let the inclination angle be θ, θ ∈ (5°, 10°). The actual tensile stress of each steel wire rope is divided by the cosine value of the inclination angle θ, and the calculation formula is as follows:

[0045]

[0046] In the embodiment, the thimble 5 facilitates the connection of the wire rope with the hook head 2. The thimble 5 of the wire rope is sleeved on the hook head 2, and the thimble 5 of the wire rope can automatically slide to the lowest end of the hook head 2 by the weight of the hanging object. The thimble 5 is provided in the shape of a smooth trapezoid, which is coupled with the stress section contour of the hook head 2, thereby ensuring that the stress sections of the three hook heads 2 are uniformly distributed and have the same size. The connecting head 4 of the wire rope is partially formed by alternately twisting the strands of the three wire ropes, and the twisting direction of the outer layer wire of the outer layer strand is opposite to the twisting direction of the outer layer strand of the wire rope, so that the torque generated by the strands and the strands is opposite, thereby ensuring that the twisted wire rope is not loose and twisted.

[0047] In some embodiments, as shown in Figure 1 and Figure 2 , the connecting head 4 is externally sleeved with a fixing sleeve 6 to enhance the connection stability of the wire rope.

[0048] Specifically, the fixing sleeve 6 is a conical sleeve, and the twisted wire rope is fixed by the conical sleeve. The strength of the fixed part reaches the strength of the wire rope itself.

[0049] In the embodiment, the fixing sleeve 6 tightly sleeves the connecting head 4 to enhance the stability of the twisted wire rope, i.e., the connecting head 4, and avoid the loosening of the wire rope.

[0050] In some embodiments, as shown in Figure 3 , Figure 4 and Figure 5 , the hook head 2 comprises a bending part and an upward extending part, the bending part and the upward extending part are connected, and the cross section of the bending part in the stress direction is a smooth trapezoidal cross section.

[0051] In addition, the thimble 5 is a smooth trapezoidal thimble 5 to enhance the stability of the thimble 5 sleeved on the bending part.

[0052] Specifically, according to the curved beam bending theory, the strength of the hook head is calculated according to the criterion that the maximum stress does not exceed the yield limit of the material. Combined with the characteristics of the three-way hook, the strength of the stress section of the three hook heads needs to be calculated.

[0053] The stress section is a smooth trapezoidal section, i.e., the angles of the trapezoid are chamfered, the smooth trapezoidal section is approximately a trapezoidal section, the load is eccentric tension, P Q is the rated lifting capacity of the hook, the eccentric distance is e1 is the distance from the center of gravity of the section to the inner edge of the maximum stress edge, e2 is the distance from the center of gravity of the section to the outer edge of the maximum stress edge, h is the height of the trapezoidal section, B is the upper width of the trapezoidal section, b is the lower width of the trapezoidal section, φ is the dynamic coefficient, A is the area of the stress section, and K B is a coefficient determined according to the shape of the curved beam section.

[0054] wherein

[0055] When the direction of the steel wire rope is vertically downward, the stress of the point 1 of the inner edge of the section is the maximum tensile stress σ1, the stress of the point 2 of the outer edge of the section is the maximum compressive stress σ2, and the calculation formula of the stress of the section is as follows:

[0056]

[0057] Combined with the stress characteristics of the three-way hook, the two steel wire ropes are separated by 120°, the actual stress direction of the steel wire rope is inclined to the middle hook body, the inclination angle is θ, θ ∈ (5°, 10°), the actual stress of the section is multiplied by the cosine value of the inclination angle θ, and the calculation formula is as follows:

[0058]

[0059] In the embodiment, the cross section of the bending part in the stress direction is a smooth trapezoidal section, so as to ensure uniform stress of the hook head, improve the service life of the hook head, the sleeve ring is a smooth trapezoidal sleeve ring, and the sleeve ring is matched with the shape of the bending part, so as to enhance the stability of the sleeve ring on the bending part.

[0060] In some embodiments, as shown in Figure 6 The end of the upper extension part is provided with an anti-falling groove 71, the end of the elastic rope away from the hook body 1 is annularly arranged, and the annular end of the elastic rope is hung in the anti-falling groove 71.

[0061] Specifically, the hook body 1 is provided with a hanging ring, one end of the elastic rope 7 is connected to the hanging ring, and the other end is annularly arranged and hung in the anti-falling groove 71, so that the elastic rope 7 is in a tight state and prevents the elastic rope 7 from being separated from the anti-falling groove 71.

[0062] In the embodiment, the elastic rope 7 is hung in the anti-falling groove 71, which can further prevent the sleeve ring 5 from falling off the hook head 2, thereby further increasing the stability of the sleeve ring 5 hung on the hook head 2.

[0063] The improvements of the utility model are as follows:

[0064] (1) The hook part: the three-way hook disclosed by the utility model is characterized in that three hook heads 2 are arranged to be separated by 120° from each other, and the line connecting the lowest points of the circular arcs of the three hook heads 2 is an equilateral triangle, so that the lifting stress direction of the hoisted object is uniform three-way stress, the triangular stability is achieved, the hook is prevented from swinging greatly during lifting, the stability of hoisting operation is ensured, and the safety hidden danger of external uncertain factors is reduced.

[0065] (ii) Steel wire rope part: three steel wire ropes are connected with the lowest point of the three-way hook head 2 through the fixing mode of the thimble 5, the ends of the three steel wire ropes are twisted into a connecting head 4, and the three steel wire ropes are arranged in an inverted isosceles triangular pyramid shape in space, the stress of the front end of the three steel wire ropes is outward, the stress of the end is inward, the steel wire rope is prevented from falling off from the lifting hook when the lifting object is affected by the outside world, and the safety of the operation site is enhanced.

[0066] (iii) Binding method: the binding and fixing of the lifting hook and the steel wire rope only need to put the thimble 5 of the steel wire rope on the hook head 2 of the lifting hook, and the thimble 5 of the steel wire rope can slide to the lowest end of the lifting hook by the weight of the hanging object itself, without the need for excessive manual operation and auxiliary equipment. The working efficiency of this kind of assembly is high, and the operation is convenient and fast. The tail part of the lifting hook is forged into a threaded structure, and the lifting hook can be fixed on the lifting hook beam through a nut, without the need to transform the existing lifting equipment, thereby saving the transformation cost.

[0067] (iv) Anti-falling groove part: an anti-falling groove 71 is arranged on the upper extension part of the hook head 2, and an elastic rope 7 is connected on the hook body 1, the annular end of the elastic rope 7 is hung on the anti-falling groove 71, so that the thimble 5 is further prevented from falling off from the hook head 2, thereby further increasing the stability of the thimble 5 hung on the hook head 2.

[0068] The application scenario of the utility model:

[0069] In the wharf port, warehouse factory, logistics hub, construction site, due to the influence of external environment airflow, resonance, inertia and other factors, the lifting operation is large, and the hanging object needs to be avoided to swing in the air during lifting. The three-way lifting hook can prevent the hanging object from swinging and unhooking through the design improvement of the structure and the improvement of the binding method, and can stably complete the lifting task. The three-way lifting hook has the advantages of uniform and symmetrical structure, small size and light weight, the binding method of the three steel wire ropes has the characteristics of high stability and high flexibility, and can meet the lifting demand of the wharf port, warehouse factory, logistics hub, construction site and the like, and can be used for lifting goods, such as containers, ton bag goods, steel and iron products, pipeline plates, concrete components, mineral products, wood, chemical products and mechanical equipment.

[0070] The embodiments of the present application are intended to cover all such replacements, modifications and variations falling within the broad scope of the present application. Therefore, any omission, modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A three-way hook, characterized in that The utility model relates to a hook body (1) and hook head (2), the hook head (2) is equipped in the bottom of hook body (1), the hook head (2) is provided with three, and it is evenly distributed along the circumferential direction of hook body (1), the connecting rope (3) is connected on the hook head (2), the end of connecting rope (3) away from the hook head (2) is combined into connecting head (4), and the connecting head (4) is used to connect hoisting object. The utility model relates to a hook body (1) and hook head (2), the hook head (2) is equipped in the bottom of hook body (1), the hook head (2) is provided with three, and it is evenly distributed along the circumferential direction of hook body (1), the connecting rope (3) is connected on the hook head (2), the end of connecting rope (3) away from the hook head (2) is combined into connecting head (4), and the connecting head (4) is used to connect hoisting object.

2. A three-way lifting hook according to claim 1, characterized in that The central axis of the hook body (1) coincides with the central axis of the connecting head (4). The end of the connecting rope (3) is provided with a thimble (5), and the thimble (5) is hung on the hook head (2).

3. A three-way lifting hook according to claim 1, characterized in that The connecting rope (3) is a steel wire rope.

4. A three-way lifting hook according to claim 3, characterised in that The hook head (2) comprises a bending part and an upward extension part, the bending part and the upward extension part are connected, and the cross section of the bending part in the stress direction is a smooth trapezoidal cross section.

5. A three-way lifting hook according to claim 3, characterised in that The thimble (5) is a smooth trapezoidal thimble (5), so as to enhance the stability of the thimble (5) on the bending part.

6. A three-way lifting hook according to claim 5, characterised in that The connecting head (4) is provided with a fixing sleeve (6) outside, so as to enhance the connection stability of the steel wire rope.

7. A three-way lifting hook according to claim 4, wherein The end of the hook body (1) away from the hook head (2) is provided with a mounting thread.

8. A three-way lifting hook according to claim 5, characterized in that The hook body (1) is provided with an elastic rope (7), the end of the upward extension part is provided with an anti-off groove (71), the end of the elastic rope away from the hook body (1) is annularly arranged, and the annular end of the elastic rope is hung in the anti-off groove (71).

9. A three-way lifting hook according to claim 5, characterized in that ​

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