Tower crane and lifting hook device thereof

Abstract

The present invention relates to the technical field of tower cranes, and specifically relates to a tower crane and a lifting hook device thereof. The lifting hook device comprises an upper pulley assembly and a lower pulley assembly, wherein a hanging assembly capable of being unfolded or folded is provided on the upper pulley assembly, the lower pulley assembly is provided with a lifting hook and an adjusting member, when a two-rate mode needs to be used, the lower pulley assembly and the upper pulley assembly are separated, the lower pulley assembly is separately used for operation, and at this moment, the hanging assembly is in an unfolded state; and when a four-rate mode needs to be used, the lower pulley assembly is connected to the upper pulley assembly, at the same time, the upper pulley assembly and the lower pulley assembly are simultaneously used for operation, and at this moment, the hanging assembly is in a folded state. In the present invention, the hanging assembly switches from the folded state to the unfolded state by means of the adjusting member, and the unfolded state is maintained until the lower pulley assembly is separated from the upper pulley assembly, thereby achieving the switching of the four-rate mode to the two-rate mode, and thus no manual replacement of the rate is required to increase the speed of replacing the rate of the lifting hook device.

Description

Tower crane and its hook device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese patent application 202410328435.2, filed on March 21, 2024, the contents of which are incorporated herein by reference. Technical Field

[0003] The present invention belongs to the technical field of tower cranes, and in particular relates to a tower crane and a hook device thereof. Background Art

[0004] Tower cranes are mainly used for lifting operations in the construction industry. Tower cranes include a main boom and a hook device slidingly arranged under the main boom. The hook device includes a tower crane pulley block and a hook connected to the tower crane pulley block. The tower crane pulley block includes two modes: double ratio and quadruple ratio. The difference between the two different ratios lies in the winding method of the wire rope on the tower crane pulley block. The maximum lifting weight of the four-ratio mode is twice that of the two-ratio mode. Therefore, the tower crane can increase the lifting weight by switching the ratio of the tower crane pulley block, so as to adapt to different working conditions.

[0005] In the prior art, manual replacement of the magnification is required, that is, the operator changes the winding method of the wire rope, but the speed of manually replacing the magnification of the hook device is slow, which may affect the working efficiency.

[0006] Summary of the Invention

[0007] The object of the present invention is to provide a tower crane and a hook device thereof, aiming to solve the technical problem of slow rate of replacing the hook device.

[0008] In order to achieve the above object, the present invention provides a hook device for a tower crane, comprising:

[0009] an upper pulley assembly, wherein the upper pulley assembly is provided with an expandable or retractable hanging assembly; and

[0010] A lower pulley assembly is provided with a hook and an adjusting piece. The lower pulley assembly can be hung on the hanging assembly when the hanging assembly is in a folded state, and can be separated from the hanging assembly when the hanging assembly is in an expanded state. The adjusting piece can act on the hanging assembly to keep the hanging assembly in an expanded state and separated from the lower pulley assembly.

[0011] Optionally, the hanging assembly includes two hanging parts arranged at intervals in the horizontal direction, the top of the hanging part is hinged to the upper pulley assembly, the bottom of the hanging part can be rotated from the inside to the outside around the top of the hanging part, and the adjusting part is slidably arranged on the lower pulley assembly in the vertical direction and can unfold the two hanging parts during the sliding process.

[0012] Optionally, a snap-fit ​​structure for limited snap-fit ​​engagement with the adjusting member is formed at the bottom of the hanging member.

[0013] Optionally, the clamping structure includes a boss protruding inward from the inner side surface of the hanging member, and a transition section for smooth connection is provided between the boss and the bottom of the hanging member.

[0014] Optionally, an inclined guide portion inclined downward and outward is formed at the bottom of the hanging member, the inclined guide portion is smoothly connected to the boss, and the adjusting member slides along the inclined guide portion to unfold the two hanging members.

[0015] Optionally, the lower pulley assembly is provided with a connecting pin, and the bottom of the hanging member is provided with a hanging groove that cooperates with the connecting pin;

[0016] Optionally, the upper pulley assembly and the hanging member are respectively provided with locking holes, and the hook device further includes a locking pin detachably inserted into the locking hole.

[0017] Optionally, the lower wheel frame of the lower pulley assembly is provided with a waist-shaped hole penetrating in the horizontal direction and extending in the vertical direction, and the adjusting member is slidably arranged in the waist-shaped hole.

[0018] Optionally, the number of the waist-shaped holes is two, and the adjusting member is an annular structural member and passes through the two waist-shaped holes outward from both sides of the lower pulley assembly.

[0019] Optionally, the upper pulley assembly is provided with a fixed pin shaft, and the hook device further comprises a fixing member arranged on the load-carrying trolley, and the fixing member is provided with a limiting groove which opens downward and cooperates with the fixed pin shaft.

[0020] A second aspect of the present invention provides a tower crane, comprising:

[0021] main boom;

[0022] A load-carrying trolley is provided on the main arm; and

[0023] The hook device of the tower crane as described above.

[0024] Through the above technical solution, the tower crane and the hook device thereof provided by the specific embodiment of the present invention have the following beneficial effects:

[0025] The hook device includes an upper pulley assembly and a lower pulley assembly. When the double-rate mode is required, the lower pulley assembly and the upper pulley assembly need to be separated so that the lower pulley assembly can be used alone for lifting operations. When the quadruple-rate mode is required, the lower pulley assembly needs to be connected to the upper pulley assembly so that the upper pulley assembly and the lower pulley assembly can be used simultaneously for lifting operations. In the present invention, when it is necessary to switch from the quadruple-rate mode to the double-rate mode, the adjustment member acts on the hanging assembly to keep the hanging assembly in an unfolded state and separate it from the lower pulley assembly, thereby achieving separation of the lower pulley assembly and the upper pulley assembly, thereby eliminating the need for manual rate change and speeding up the rate change of the hook device.

[0026] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the accompanying drawings:

[0028] FIG1 is a schematic structural diagram of a hook device according to a specific embodiment of the present invention;

[0029] FIG2 is a structural schematic diagram of a hook device from another perspective according to a specific embodiment of the present invention;

[0030] FIG3 is a schematic structural diagram of a lower pulley assembly according to a specific embodiment of the present invention;

[0031] FIG4 is a schematic diagram of a hook device switching from a quadruple-rate mode to a double-rate mode according to a specific embodiment of the present invention;

[0032] FIG5 is an enlarged schematic diagram of part A in FIG4 ;

[0033] FIG6 is a schematic diagram of a hook device switching from a double-rate mode to a quadruple-rate mode according to a specific embodiment of the present invention;

[0034] FIG7 is a schematic structural diagram of an adjusting member according to a specific embodiment of the present invention;

[0035] FIG8 is a schematic structural diagram of a hanging member according to a specific embodiment of the present invention;

[0036] FIG9 is a schematic diagram showing the connection between the upper pulley assembly and the load trolley according to a specific embodiment of the present invention;

[0037] FIG10 is a schematic diagram showing the connection between the upper pulley assembly and the load-carrying trolley from another perspective according to a specific embodiment of the present invention.

[0038] Description of Reference Numerals

[0039] 100 hook device; 200 load trolley;

[0040] 1 upper pulley assembly;

[0041] 11 fixed pin, 12 upper wheel frame, 13 clamping plate, 14 plug-in slot, 15 folding edge;

[0042] 2. Lower pulley assembly;

[0043] 21 lower wheel frame, 22 waist-shaped hole;

[0044] 3. Mounting components;

[0045] 31 hanging member, 32 boss, 33 inclined guide portion, 34 hanging groove;

[0046] 311 hooking plate portion, 312 connecting plate portion;

[0047] 4 hooks;

[0048] 5 adjusting member; 51 limiting protrusion;

[0049] 6 connecting hook; 7 locking hole; 8 locking pin; 9 fixing piece DETAILED DESCRIPTION

[0050] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0051] The following describes the noun part of a tower crane and a hook assembly 100 thereof according to the present invention with reference to the accompanying drawings.

[0052] As shown in Figures 1 and 2, a specific embodiment of the present invention provides a hook device 100 for a tower crane, including an upper pulley assembly 1 and a lower pulley assembly 2, wherein the upper pulley assembly 1 is provided with a hanging assembly 3 that can be deployed or retracted; the lower pulley assembly 2 is provided with a hook 4 and an adjusting member 5, and the lower pulley assembly 2 can be hung on the hanging assembly 3 when the hanging assembly 3 is in a retracted state, and can be separated from the hanging assembly 3 when the hanging assembly 3 is in an deployed state, and the adjusting member 5 can act on the hanging assembly 3 to keep the hanging assembly 3 in an deployed state and separated from the lower pulley assembly 2.

[0053] Specifically, the four-rate mode of the hook device 100 is as follows: the upper pulley assembly 1 and the lower pulley assembly 2 move together with the hook 4 to perform the lifting operation; the two-rate mode of the hook device 100 is as follows: the lower pulley assembly 2 moves alone with the hook 4 to perform the lifting operation, while the upper pulley assembly 1 is fixed in position under the tension of the lifting rope. The maximum lifting weight of the four-rate mode of the hook device 100 is twice that of the two-rate mode. In the present invention, the upper pulley assembly 1 and the lower pulley assembly 2 are separated and connected by switching the deployment and folding states of the hanging assembly 3. When it is necessary to switch from the four-rate mode to the two-rate mode, the adjustment member 5 acts on the hanging assembly 3 to keep the hanging assembly 3 in the deployment state and separate from the lower pulley assembly 2, so as to separate the lower pulley assembly 2 from the upper pulley assembly 1, thereby eliminating the need for manual rate change, thereby speeding up the rate mode change of the hook device 100.

[0054] Among them, the structure, connection relationship and working principle of the pulley and the suspension rope are well known to those skilled in the art and do not belong to the core improvement part of the present invention, so they will not be described here.

[0055] It should be noted that, in the specific embodiments of the present invention, unless otherwise specified, the “left-right direction” and “front-back direction” used generally refer to two directions perpendicular to each other in the same horizontal plane, “left” and “right” refer to two directions diverging from each other along the “left-right direction”, and “front” and “back” refer to two directions diverging from each other along the “left-right direction”; the “up-down direction” used generally refers to the vertical direction, and “up” and “down” refer to two directions diverging from each other along the “up-down direction”. Under normal use, the upper pulley assembly 1 is located above the lower pulley assembly 2; the “inside” and “outside” used refer to directions approaching each other and directions diverging from each other, respectively.

[0056] In some embodiments, the upper pulley assembly 1 includes an upper pulley and two upper wheel frames 12 respectively arranged on the front and rear sides of the upper pulley, and two clamping plates 13 arranged at intervals along the left and right directions. The lower pulley assembly 2 includes a lower pulley and two lower wheel frames 21 respectively arranged on the front and rear sides of the lower pulley, and a connecting pin 6 passing through the two lower wheel frames 21 along the front and rear directions.

[0057] Specifically, the tops of the two splints 13 are fixedly connected to the bottoms of the two upper wheel frames 12. The bottoms of the two splints 13 are provided with plug-in grooves 14 with openings facing downward and used to plug and cooperate with the lower wheel frame 21. During the connection process of the lower pulley assembly 2 and the upper pulley assembly 1, the connection between the lower wheel frame 21 and the splints 13 is completed through the guiding effect of the plug-in grooves 14.

[0058] Furthermore, a hooking groove 34 is formed on the hanging assembly 3 for engaging with the connecting hook pin 6. When the lower pulley assembly 2 is connected to the upper pulley assembly 1, the lower wheel frame 21 is inserted from bottom to top into the insertion groove 14 to connect the connecting hook pin 6 with the hooking groove 34. When the lower pulley assembly 2 is separated from the upper pulley assembly 1, the adjustment member 5 expands the hanging assembly 3 from the inside to the outside to separate the connecting hook pin 6 from the hooking groove 34, and the lower wheel frame 21 is disengaged from the insertion groove 14 from top to bottom.

[0059] It should be noted that the cross-sectional form of the hanging groove 34 can be U-shaped, rectangular, elliptical, triangular, long gourd-shaped, etc., and all should fall within the scope of protection of the present invention.

[0060] Preferably, the bottoms of the two clamping plates 13 are provided with outwardly folded edges 15 to further guide the lower wheel frame 21 .

[0061] In some embodiments, the hanging assembly 3 includes two hanging members 31 arranged at intervals in the horizontal direction, the top of the hanging member 31 is hinged to the upper pulley assembly 1, and the bottom of the hanging member 31 can rotate and unfold from the inside to the outside around the top of the hanging member 31.

[0062] Specifically, the two hanging parts 31 are arranged at intervals along the front-to-back direction, and the left and right sides of each hanging part 31 are respectively connected to the left and right splints 13 and are connected by a hinge axis, and the hanging part 31 located on the front side rotates forward when the hanging assembly 3 is unfolded, and the hanging part 31 located on the rear side rotates backward when the hanging assembly 3 is unfolded.

[0063] Furthermore, a hooking slot 34 is formed at the bottom of the hooking member 31. The slot 34 faces upward and extends in the front-to-back direction. Downward-extending hooks are provided at both ends of the connecting hook pin 6. These hooks engage with the walls of the hooking slot 34, thereby ensuring the stability of the connection between the connecting hook pin 6 and the hooking member 31. To separate the connecting hook pin 6 from the hooking slot 34, the connecting hook 6 needs to be moved upward to disengage from the hooking slot 34, then the hooking member 31 is extended outward and the connecting hook 6 is moved downward. To connect the connecting hook pin 6 to the hooking slot 34, the connecting pin 6 needs to be moved upward to above the hooking slot 34, then the hooking member 31 is retracted inward and the connecting pin 6 is moved downward.

[0064] Those skilled in the art will understand that the present invention is not limited to the above-mentioned rotational expansion and folding method, and other methods that can realize the expansion and folding of the hanging member 31, such as the horizontal movement expansion and folding method, should also fall within the scope of protection of the present invention.

[0065] As shown in Figure 3, in some embodiments, the adjusting member 5 moves together with the lower wheel frame 21 to expand the two hanging members 31 outward, and a clamping structure for limiting and engaging with the adjusting member 5 is formed at the bottom of the hanging member 31. The expansion state of the hanging member 31 is maintained by the limiting and engaging engagement between the adjusting member 5 and the clamping structure, so that the operator only needs to switch the magnification mode by moving the lower wheel frame 21, thereby simplifying the operation to speed up the switching of the magnification mode.

[0066] Specifically, a waist-shaped hole 22 extending in the vertical direction is provided on the lower wheel frame 21. The waist-shaped hole 22 is arranged below the connecting pin 6. The adjusting part 5 passes through the waist-shaped hole 22 in the front-to-back direction and is slidably arranged in the waist-shaped hole 22. The two ends of the adjusting part 5 in the front-to-back direction are respectively used to push the two hanging parts 31 outward and can be engaged with the clamping structure to maintain the expanded state.

[0067] It should be further explained that when the lower pulley assembly 2 is connected to the upper pulley assembly 1, there is an initial vertical spacing between the top of the lower wheel frame 21 and the bottom of the insertion slot 14. The spacing between the two hanging members 31 in the retracted state along the front-to-back direction is the minimum horizontal spacing. The length of the adjustment member 5 along the front-to-back direction is the maximum horizontal spacing between the two hanging members 31. The length of the connecting pin 6 along the front-to-back direction is greater than the minimum horizontal spacing and less than the maximum horizontal spacing. The specific process of switching the magnification mode is described in detail below:

[0068] As shown in Figures 4 and 5, the process of separating the lower pulley assembly 2 from the upper pulley assembly 1 is as follows: first, the lower wheel frame 21 moves upward by a first vertical distance, which is no greater than the initial vertical distance, and at the same time, the connecting hanging pin 6 is disengaged from the hanging groove 34 upward. Since the adjusting member 5 is in contact with the lower hole wall of the waist-shaped hole 22, the adjusting member 5 moves upward with the lower wheel frame 21 and pushes the hanging member 31 outward until the adjusting member 5 is engaged with the limiting structure. At this time, the distance between the two hanging members 31 reaches the maximum horizontal distance; then, due to the adjustment The joint part 5 is locked in position with the limiting structure, so the position of the adjusting part 5 remains unchanged to maintain the expanded state of the hanging part 31, and the lower wheel frame 21 moves downward until the adjusting part 5 contacts the upper hole wall of the waist-shaped hole 22, and at the same time, the connecting pin 6 moves downward to disengage from the hanging groove 34 from the inner side of the hanging part 31; finally, the lower wheel frame 21 continues to move downward, and at the same time, the hole wall of the waist-shaped hole 22 pushes the adjusting part 5 downward to separate from the limiting structure, and the lower wheel frame 21 continues to move until it is separated from the plug-in slot 14, completing the switch from the four-rate mode to the two-rate mode.

[0069] As shown in Figure 6, the process of connecting the lower pulley assembly 2 with the upper pulley assembly 1 is as follows: first, move the lower wheel frame 21 upward to the notch of the plug-in slot 14; then, continue to move the lower wheel frame 21 upward, and the connecting pin 6 moves upward with the lower wheel frame 21 and pushes the hanging member 31 outward until the connecting pin 6 moves to the hanging slot 34. At the same time, the hanging member 31 loses the function of the connecting pin 6 and retracts inward under the action of gravity to hang with the connecting pin 6 from the outside. At this time, the adjusting member 5 contacts the lower hole wall of the waist-shaped hole 22 but not the hanging member 31; finally, move the lower wheel frame 21 downward until the connecting pin 6 is hung down in the hanging slot 34, completing the switch from the double-rate mode to the quadruple-rate mode.

[0070] Those skilled in the art will appreciate that the structure for achieving the up-and-down movement of the lower wheel frame 21 is well known to those skilled in the art and does not constitute a core improvement of the present invention, and thus will not be described in detail here. In the present invention, the magnification can be changed simply by moving the lower wheel frame 21 up and down, thereby simplifying the hook device 100, thereby reducing the weight and assembly difficulty of the hook device 100, and further simplifying the process of changing the magnification of the hook device 100.

[0071] As shown in Figure 7, preferably, two waist-shaped holes 22 are arranged at intervals along the left and right directions on a single lower wheel frame 21, and the positions of the waist-shaped holes 22 on the two lower wheel frames 21 correspond to each other. The adjusting member 5 is an annular structural member and passes through the four waist-shaped holes 22, thereby ensuring that the adjusting member 5 does not separate from the waist-shaped holes 22 in the front-to-back direction during movement.

[0072] Furthermore, a plurality of limiting protrusions 51 are formed on the adjusting member 5 for limiting the displacement of the adjusting member 5 in the front-to-back direction, thereby preventing the adjusting member 5 from being displaced left and right during movement, causing the front end or rear end of the adjusting member 5 to be unable to unfold the hanging member 31, thereby improving the reliability of the hook device 100.

[0073] Preferably, a downwardly and outwardly inclined guide portion 33 is formed at the bottom of the hook member 31. The inclined guide portion 33 is smoothly connected to the boss 32, and the adjusting member 5 slides along the inclined guide portion 33 to unfold the two hook members 31. By sliding the adjusting member 5 along the inclined guide portion 33 between the two hook members 31 to unfold the two hook members 31, the hook members 31 and the adjusting member 5 are prevented from being stuck together, thereby improving the reliability of the hook device 100.

[0074] Specifically, the inclined guide portion 33 may be composed of a plurality of guide surfaces or linear bearings, thereby enhancing the guiding effect on the adjusting member 5 , thereby making the sliding path of the adjusting member 5 more precise and smooth.

[0075] Furthermore, the snap-fit ​​structure includes a boss 32 protruding inward from the inner side of the hanging member 31 , and a transition section for smooth connection is provided between the boss 32 and the bottom of the hanging member 31 , thereby preventing the adjusting member 5 from getting stuck during the sliding process.

[0076] Specifically, the adjusting member 5 slides along the bottom of the hanging member 31 to between the two hanging members 31. As the adjusting member 5 continues to move upward, the two hanging members 31 are gradually expanded. When the front and rear ends of the adjusting member 5 slide through the transition section, the distance between the two hanging members reaches the maximum horizontal distance. At this time, the adjusting member 5 and the boss 32 are limited and engaged to maintain the maximum horizontal distance.

[0077] Those skilled in the art will appreciate that the present invention is not limited to the aforementioned boss 32 , and other structural forms such as grooves that can achieve position-limiting engagement with the adjusting member 5 should also fall within the scope of protection of the present invention.

[0078] As shown in Figure 8, in some embodiments, the hanging member 31 includes a hanging plate portion 311 and two connecting plate portions 312. A hanging groove 34 is provided on the top of the hanging plate portion 311. The two connecting plate portions 312 are arranged at intervals in the left and right directions. The hanging plate portion 311 connects the bottoms of the two connecting plate portions 312. The inner side surface of the hanging plate portion 311 and the inner side surface of the connecting plate portion 312 are located in the same plane. The bottom surface of the hanging plate portion 311 and the bottom surface of the connecting plate portion 312 are located in the same plane. The two connecting plate portions 312 are respectively connected to the two splints 13.

[0079] Specifically, the bottom surfaces of the hooking plate portion 311 and the connecting plate portion 312 form an inclined guide portion 33, and the bottom of the inner side surface of the connecting plate portion 312 forms a boss 32. Since the entire hook member 31 is composed of three plates and is lightweight, the overall weight of the hook device 100 is also lightweight.

[0080] In some embodiments, a locking hole 7 is provided on the upper pulley assembly 1 and the hanging member 31 , respectively. The hook device 100 further includes a locking pin 8 detachably inserted into the locking hole 7 .

[0081] Specifically, locking holes 7 are formed on the hook plate portion 311 and the clamping plate 13. Locking pins 8 are used to penetrate the locking holes 7 on the components to restrict the rotation of the hook member 31, thereby restricting the deployment of the hanging assembly 3. After the lower pulley assembly 2 is connected to the upper pulley assembly 1 to complete the switch from the two-rate mode to the four-rate mode, in order to ensure the stability of the hook device 100 during construction in the four-rate mode, it is necessary to lower the hook device 100 to the ground and insert the locking pin 8 before resuming operation.

[0082] As shown in Figures 9 and 10, in some embodiments, the upper pulley assembly 1 is provided with a fixed pin shaft 11, and the hook device 100 also includes a fixing member 9 arranged on the load-carrying trolley 200, and the fixing member 9 is provided with a limiting groove that opens downward and cooperates with the fixed pin shaft 11.

[0083] Specifically, the fixed pin 11 is passed through the upper wheel frame 12, the top of the fixing part 9 is connected to the crossbeam of the load-carrying trolley 200, and a limiting groove is provided at the bottom of the fixing part 9. After the upper pulley assembly 1 and the lower pulley assembly 2 are separated, the upper pulley assembly 1 moves upward under the tension of the lifting rope until the fixed pin 11 is tightly pressed against the bottom of the limiting groove, so that the upper pulley participates in the lifting operation as a fixed pulley, thereby completing the switch from the four-rate mode to the two-rate mode.

[0084] Furthermore, in addition to the positioning cooperation between the above-mentioned fixing part 9 and the limiting groove, a pad can be added to the top of the upper wheel frame 12, and a guide positioning plate can be set at the bottom of the load-carrying trolley 200 to position the upper pulley assembly 1 through the surface contact between the pad and the guide positioning plate.

[0085] A specific embodiment of the present invention provides a tower crane, comprising a main boom, a load trolley 200, and a hook assembly 100, wherein the load trolley 200 is disposed on the main boom, and the hook assembly 100 is disposed on the load trolley 200. Because the tower crane employs all embodiments of the hook assembly 100, the tower crane has all the benefits provided by the hook assembly 100.

[0086] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0087] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0088] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0089] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A hook device for a tower crane, characterized in that: include: An upper pulley assembly (1), wherein the upper pulley assembly (1) is provided with a hanging assembly (3) that can be unfolded or folded; and A lower pulley assembly (2) is provided with a hook (4) and an adjusting member (5). The lower pulley assembly (2) can be hung on the hanging assembly (3) when the hanging assembly (3) is in a folded state, and can be separated from the hanging assembly (3) when the hanging assembly (3) is in an unfolded state. The adjusting member (5) can act on the hanging assembly (3) to keep the hanging assembly (3) in an unfolded state and separate from the lower pulley assembly (2).

2. The hook device of a tower crane according to claim 1, characterized in that: The hanging assembly (3) comprises two hanging members (31) arranged at intervals in the horizontal direction, the top of the hanging member (31) is hinged to the upper pulley assembly (1), the bottom of the hanging member (31) can be rotated from the inside to the outside around the top of the hanging member (31), and the adjusting member (5) is slidably arranged on the lower pulley assembly (2) in the vertical direction and can unfold the two hanging members (31) during the sliding process.

3. The hook device of a tower crane according to claim 2, wherein: The bottom of the hanging member (31) is formed with a clamping structure for limited clamping engagement with the adjusting member (5).

4. The hook device of a tower crane according to claim 3, wherein: The clamping structure comprises a boss (32) protruding inward from the inner side surface of the hanging member (31), and a transition section for smooth connection is provided between the boss (32) and the bottom of the hanging member (31).

5. The hook device of a tower crane according to claim 4, characterized in that: The bottom of the hanging member (31) is formed with an inclined guide portion (33) inclined downward and outward, the inclined guide portion (33) is smoothly connected to the boss (32), and the adjusting member (5) slides along the inclined guide portion (33) to unfold the two hanging members (31).

6. The hook device of a tower crane according to claim 2, wherein: The lower pulley assembly (2) is provided with a connecting hook pin (6), and the bottom of the hanging member (31) is provided with a hanging groove (34) that cooperates with the connecting hook pin (6); And / or, the upper pulley assembly (1) and the hanging member (31) are respectively provided with a locking hole (7), and the hook device (100) further includes a locking pin (8) detachably inserted into the locking hole (7).

7. The hook device of a tower crane according to claim 2, wherein: The lower wheel frame (21) of the lower pulley assembly (2) is provided with a waist-shaped hole (22) penetrating in the horizontal direction and extending in the vertical direction, and the adjusting member (5) is slidably arranged in the waist-shaped hole (22).

8. The hook device of a tower crane according to claim 7, wherein: There are two waist-shaped holes (22), and the adjusting member (5) is an annular structural member and passes through the two waist-shaped holes (22) outward from both sides of the lower pulley assembly (2).

9. The hook device of a tower crane according to claim 1, wherein: The upper pulley assembly (1) is provided with a fixed pin shaft (11), and the hook device (100) further comprises a fixing member (9) arranged on the load-carrying trolley, wherein the fixing member (9) is provided with a limiting groove which opens downward and is limitedly engaged with the fixed pin shaft (11).

10. A tower crane, characterized in that: include: main boom; A load-carrying trolley (200) is arranged on the main arm; and A hook device (100) for a tower crane according to any one of claims 1 to 9.

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