Tower crane step changer and tower crane

Abstract

This invention discloses a tower crane step-changing device and a tower crane. The tower crane step-changing device includes a step-changing frame and a step-changing swing arm. The step-changing frame includes two support arms and a connecting beam connecting the two support arms. The upper ends of both support arms are hinged to the upper straight web of the climbing frame, and the lower ends of both support arms have locking slots corresponding to the steps on the standard section of the tower crane. The upper end of the step-changing swing arm is hinged to the upper straight web and is used to push or pull the connecting beam when force is applied to the lower end. The operator drives the entire step-changing frame to swing by the step-changing swing arm to engage or disengage the step-changing frame with or from the steps. Compared with the solution of directly controlling the step-changing frame, the operation is more labor-saving, and even a single person can operate the heavy step-changing frame to engage or disengage with the steps, effectively improving the step-changing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of lifting equipment technology, specifically relating to a tower crane step changing device and a tower crane. Background Technology

[0002] Step changing is a crucial step in the lifting or lowering process of a tower crane. The specific operation is as follows: During lifting, the lifting cylinder first raises the tower crane by one step height. Then, the step changing device is engaged with the standard section steps to support the upper part of the tower crane. Finally, the lifting cylinder retracts, and the lifting beam is engaged with the next set of standard section steps, completing one step changing operation. During lowering, the lifting cylinder retracts, lowering the tower crane by one step height. Then, the step changing device is engaged with the standard section steps to support the upper part of the tower crane. Finally, the lifting cylinder extends again, and the lifting beam is engaged with the next set of standard section steps, completing one step changing operation.

[0003] In the existing technology, tower cranes, especially small and medium-sized tower cranes, require manual operation of the step changing device to engage and disengage the steps. However, the step changing device is heavy, and it is very strenuous to operate it to engage or disengage the steps. It often requires multiple people to operate, resulting in low step changing efficiency. Summary of the Invention

[0004] To address the aforementioned deficiencies or shortcomings, this invention provides a tower crane step changing device and a tower crane, aiming to solve the technical problem that existing step changing devices are laborious to operate when engaging or disengaging steps, require multiple people to operate simultaneously, and thus result in low step changing efficiency.

[0005] To achieve the above objectives, the present invention provides a tower crane step changing device, wherein the tower crane step changing device includes a step changing frame and a step changing swing arm. The step changing frame includes two support arms and a connecting beam connecting the two support arms. The upper ends of the two support arms are both hinged to the upper straight web of the climbing frame, and the lower ends of the two support arms are formed with a locking hole corresponding to the step on the standard section of the tower crane. The upper end of the step changing swing arm is hinged to the upper straight web and is used to push or pull the connecting beam when force is applied to the lower end, so that the two support arms of the step changing frame can engage or disengage from the step.

[0006] In this embodiment of the invention, the step-changing swing arm is provided with a swing sliding column, and a card plate is provided extending from the inner side of the connecting beam. The card plate is provided with a sliding groove for the swing sliding column to swing and slide.

[0007] In this embodiment of the invention, there are two card plates, which are arranged relatively at intervals on the inner side of the connecting crossbeam. The step-changing swing rod is placed between the two card plates, and there are swing sliding columns on both sides that are correspondingly inserted into the sliding grooves of the two card plates.

[0008] In this embodiment of the invention, the sliding groove extends vertically and has an upper opening or a lower opening.

[0009] In this embodiment of the invention, the tower crane step-changing device further includes a connecting seat disposed on the lower straight web of the climbing frame, and the lower end of the step-changing swing arm is detachably connected to the connecting seat.

[0010] In this embodiment of the invention, the connecting seat includes two connecting lugs that are spaced apart from each other, and the step-changing lever is placed between the two connecting lugs and detachably connected by a pin.

[0011] In this embodiment of the invention, the pin is used to connect to the lower straight web member via a connecting member.

[0012] In this embodiment of the invention, an abutment block is also provided on the inner side of the connecting beam for abutting against the main chord of the climbing frame.

[0013] In this embodiment of the invention, the support arm includes an arm body and a connecting rod. The connecting rod extends out from the inside of the connecting crossbeam. The arm body includes a hinge section that is inclined inward from top to bottom and a locking section that extends vertically from the lower end of the hinge section. The junction of the hinge section and the locking section is connected to the end of the connecting rod away from the connecting crossbeam. The hinge section is used to hinge with the upper straight web of the climbing frame. The lower end of the locking section forms a locking opening.

[0014] To achieve the above objectives, the present invention also provides a tower crane, wherein the tower crane includes the tower crane step changing device according to the above description.

[0015] Through the above technical solution, the tower crane step-changing device provided in the embodiments of the present invention has the following beneficial effects:

[0016] When the tower crane uses the aforementioned tower crane step-changing device, which includes a step-changing frame and a step-changing swing arm, the step-changing frame comprises two support arms and a connecting beam connecting the two support arms. The upper ends of both support arms are hinged to the upper straight web members of the climbing frame, and the lower ends of both support arms have locking slots corresponding to the steps on the standard sections of the tower crane. The upper end of the step-changing swing arm is hinged to the upper straight web members and is used to push or pull the connecting beam when force is applied to the lower end. The operator then operates the step-changing swing arm to rotate the entire step-changing frame, thereby engaging or disengaging the step-changing frame from the steps. Compared to the method of directly controlling the step-changing frame, the operation is more labor-saving, and even a single person can operate the heavy step-changing frame to engage or disengage from the steps, effectively improving step-changing efficiency. Moreover, by extending the length of the step-changing swing arm, the operator can operate from a greater distance, eliminating the need to set up a platform for the operator to work directly at the step-changing frame, thus reducing costs.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the tower crane step-changing device according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0021] Figure 3 This is a schematic diagram of the tower crane step-changing device on the climbing frame according to an embodiment of the present invention;

[0022] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0023] Figure 5 This is a schematic diagram of the tower crane structure when the step-changing swing arm swings outward according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the tower crane structure when the step-changing swing arm swings inward according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures

[0026] 1. Step changer 11. Support arm

[0027] 111 Mounting port 112 Connecting rod

[0028] 113 Articulated section 114 Clip-on section

[0029] 12 Connecting beam 121 Abutment block

[0030] 13. Sliding groove of plate 131

[0031] 2. Step-changing lever 21. Swinging sliding column

[0032] 3 Connector 4 Pin

[0033] 5 Connecting parts 6 Climbing frame

[0034] 61 Upper straight bar 62 Lower straight bar

[0035] 63 Main chord 7 Step Detailed Implementation

[0036] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0037] The tower crane step-changing device and tower crane of the present invention are described below with reference to the accompanying drawings.

[0038] like Figure 1 As shown, the present invention provides a tower crane step changing device, wherein the tower crane step changing device includes:

[0039] The step-changing frame 1 includes two support arms 11 and a connecting beam 12 connecting the two support arms 11. The upper ends of the two support arms 11 are both hinged to the upper straight web rod 61 of the climbing frame 6, and the lower ends of the two support arms 11 are formed with a mounting hole 111 corresponding to the step 7 on the standard section of the tower crane.

[0040] The step-changing lever 2 is hinged at its upper end to the upper straight web bar 61 and is used to push or pull the connecting crossbeam 12 when force is applied to the lower end, so that the two support arms 11 of the step-changing frame 1 can be engaged or disengaged from the step 7.

[0041] When using the tower crane step-changing device described above, since it includes a step-changing frame 1 and a step-changing swing arm 2, and the two support arms 11 of the step-changing swing arm 2 and the step-changing frame 1 are hinged to the upper straight web member 61, and the lower end of the support arm 11 forms a locking port 111 corresponding to the step 7 on the standard section of the tower crane, the operator drives the step-changing frame 1 to swing by the step-changing swing arm 2 to hook the step-changing frame 1 into or out of the step 7. Compared with the scheme of directly controlling the step-changing frame 1, the operation process is more labor-saving. Even a single person can operate the heavy step-changing frame 1 to hook into or out of the step 7, which effectively improves the step-changing efficiency. Moreover, by extending the length of the step-changing swing arm 2, the operator can perform the step-changing operation from a more distant position, without having to set up a platform for the operator to work directly at the step-changing frame 1, thus reducing costs.

[0042] Specifically, the connecting beam 12 is made of I-beams to ensure its structural strength. Of course, the structural shape of the connecting beam 12 is not limited to I-beams. Under the premise of ensuring structural strength, it can also be set as a square tube, rectangular tube, box beam spliced ​​with plates, etc.

[0043] It should be noted that in this invention, the inner side and outer side are relative to the standard section of the tower crane. The side facing the standard section of the tower crane is the inner side, and the side away from the standard section of the tower crane is the outer side.

[0044] like Figure 2As shown in this embodiment of the invention, the step-changing swing arm 2 is provided with a swing sliding column 21, and a retaining plate 13 is provided extending from the inner side of the connecting beam 12. The retaining plate 13 has a sliding groove 131 for the swing sliding column 21 to swing and slide. The operator controls the step-changing swing arm 2 to swing, and the swing sliding column 21 on the step-changing swing arm 2 slides along the sliding groove 131 and drives the step-changing frame 1 to swing accordingly. The retaining plate 13 is located on the inner side of the connecting beam 12, which makes it easier for the operator to apply force to control the step-changing swing arm 2. In addition, since the swing sliding column 21 and the retaining plate 13 can move relative to each other through the sliding groove 131, the swing process of the tower crane step-changing device is smoother and avoids jamming.

[0045] It should be noted that the card plate 13 is not limited to being located on the inner side of the crossbeam 12; it can also be located on the outer side. Furthermore, the connection method between the step-changing swing arm 2 and the connecting crossbeam 12 is not limited to the aforementioned swing sliding column 21 and sliding groove 131; it can also be an abutment or fixed connection. When the step-changing swing arm 2 and the connecting crossbeam 12 are in abutment position, the step-changing swing arm 2 is only used to disengage the step-changing frame 1 from the step 7. The process of the support arm 11 being hooked into the step 7 is achieved through the weight of the support arm 11 and the connecting crossbeam 12 itself, as well as direct control of the connecting crossbeam 12 by the operator. When the step-changing swing arm 2 and the connecting crossbeam 12 are in a fixed connection (such as a threaded connection or welding), the upper end of the step-changing swing arm 2 is directly fixed to the connecting crossbeam 12, without needing to be hinged to the upper straight web rod 61.

[0046] In this embodiment of the invention, two locking plates 13 are arranged at intervals on the inner side of the connecting beam 12. A step-changing swing rod 2 is positioned between the two locking plates 13, and swing-sliding columns 21, corresponding to each other, are provided on both sides and pass through the sliding grooves 131 of the two locking plates 13. Setting the number of locking plates 13 to two reduces the stress on a single locking plate 13, extends its service life, and provides better structural stability compared to a single locking plate 13. Specifically, a reinforcing plate is also connected between the two locking plates 13 to improve the overall structural strength of the two locking plates 13 and prevent deformation.

[0047] In this embodiment of the invention, the sliding groove 131 extends vertically and has an upper or lower opening. When the support arm 11 is hooked into the step 7, the operator controls the step-changing swing rod 2 to swing inward, and the swinging sliding column 21 moves upward along the sliding groove 131, causing the step-changing frame 1 to swing inward until the mounting opening 111 of the support arm 11 is aligned with the step 7; when the support arm 11 is removed from the step 7, the operator controls the step-changing swing rod 2 to swing outward, and the swinging sliding column 21 moves downward along the sliding groove 131, causing the step-changing frame 1 to swing outward. Since the sliding groove 131 extends vertically, the opening design allows the swinging sliding column 21 to be quickly engaged within the sliding groove 131, facilitating disassembly and installation. Specifically, the length of the sliding groove 131 needs to be set according to the maximum deflection angle of the step-changing swing rod 2 to prevent the swinging sliding column 21 from detaching from the sliding groove 131.

[0048] like Figure 3 and Figure 4 As shown in this embodiment of the invention, the tower crane step-changing device further includes a connecting seat 3 disposed on the lower straight web member 62 of the climbing frame 6, and the lower end of the step-changing swing arm 2 is detachably connected to the connecting seat 3. The connecting seat 3 can fix the step-changing swing arm 2 and the step-changing frame 1 after the tower crane's step-changing operation is completed, preventing them from colliding with the standard section of the tower crane or the climbing frame 6 due to external force swinging during the tower crane's operation, thus avoiding damage to the tower crane.

[0049] like Figure 4 As shown, in this embodiment of the invention, the connecting seat 3 includes two connecting lugs arranged at relative intervals, and the step-changing lever 2 is placed between the two connecting lugs and detachably connected in series via a pin 4. The design of connecting in series via the pin 4 facilitates disassembly and assembly by the operator.

[0050] It should be noted that, in this invention, the connection method between the step-changing lever 2 and the connecting seat 3 is not limited to a pin connection; a threaded connection or a snap-fit ​​connection is also possible.

[0051] In this embodiment of the invention, the pin 4 is used to connect to the lower straight web member 62 via the connecting member 5. The connecting member 5 allows the pin 4 to be connected to the lower straight web member 62 without separate storage, facilitating easy access and preventing the pin 4 from being lost. Specifically, considering the actual operating environment of the tower crane's step-changing device, the connecting member 5 is preferably a chain, and the end of the chain not connected to the pin 4 is welded to the lower straight web member 62. Furthermore, the end of the pin 4 furthest from the connecting member 5 can also be provided with an external thread section, and a connecting nut can be used to prevent the pin 4 from coming out.

[0052] like Figure 1 and Figure 3As shown, in this embodiment of the invention, an abutment block 121 extends outward from the inner side of the connecting beam 12 to abut against the main chord 63 of the climbing frame 6. After the support arm 11 is engaged with the step 7, the abutment block 121 abuts against the outer side of the main chord 63 to withstand the force of the step-changing frame 1 in the horizontal direction, making the tower crane step-changing device more stable and the entire step-changing process smoother, avoiding significant shaking. Specifically, there are two abutment blocks 121, which are respectively located at both ends of the connecting beam 12 and abut against the main chord 63 on both sides of the climbing frame 6.

[0053] In this embodiment of the invention, the support arm 11 includes an arm body and a connecting rod 112. The connecting rod 112 extends from the inside of the connecting beam 12. The arm body includes a hinge section 113 that slopes inward from top to bottom and a locking section 114 that extends vertically from the lower end of the hinge section 113. The junction of the hinge section 113 and the locking section 114 is connected to the end of the connecting rod 112 away from the connecting beam 12. The hinge section 113 is used to hinge with the upper straight web rod 61 of the climbing frame 6. The lower end of the locking section 114 forms a locking opening 111. Through the above arrangement, the support arm 11 presents an L-shaped structure, extending the length of the support arm 11 in the horizontal direction, so that the connecting beam 12 can be located outside the climbing frame 6. Since the hinge section 113 slopes inward from top to bottom, when the support arm 11 rotates inward as a whole, the locking section 114 can be directly opposite the step 7, improving the stability of the support.

[0054] Furthermore, the present invention also provides a tower crane, wherein the tower crane includes the tower crane step-changing device according to the above-described embodiments. Since the tower crane adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0055] Specifically, see Figure 5 When the step-changing device is detached from step 7, the step-changing swing arm 2 moves away from the standard section of the tower crane. The step-changing swing arm 2 drives the step-changing frame 1 to swing outward through the swing sliding column 21 in the sliding groove 131; see also Figure 6 When the step-changing device is attached to the step 7, the step-changing swing arm 2 moves toward the standard section of the tower crane. Through the swing sliding column 21 in the sliding groove 131, it drives the step-changing frame 1 to move inward, so that the clamping section 114 of the step-changing frame 1 is attached to the step 7 on the standard section.

[0056] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A tower crane step changing device, characterized in that, The tower crane step-changing device includes: The step change frame (1) includes two support arms (11) and a connecting beam (12) connecting the two support arms (11). The upper ends of the two support arms (11) are hinged to the upper straight web bar (61) of the climbing frame (6), and the lower ends of the two support arms (11) are formed with a mounting hole (111) corresponding to the step (7) on the standard section of the tower crane. The step-changing lever (2) is hinged at its upper end to the upper straight web bar (61) and is used to push or pull the connecting crossbeam (12) when force is applied to its lower end, so that the two support arms (11) of the step-changing frame (1) can engage or disengage from the step (7). The step-changing swing arm (2) is provided with a swing sliding column (21), and a card plate (13) is provided on the inner side of the connecting crossbeam (12). The card plate (13) is provided with a sliding groove (131) for the swing sliding column (21) to swing and slide.

2. The tower crane step-changing device according to claim 1, characterized in that, The number of the card plates (13) is two and they are arranged relatively at intervals on the inner side of the connecting beam (12). The step-changing swing rod (2) is placed between the two card plates (13) and there are swing sliding columns (21) on both sides that are correspondingly inserted into the sliding grooves (131) of the two card plates (13).

3. The tower crane step-changing device according to claim 1, characterized in that, The sliding groove (131) is vertically extended and has an upper opening or a lower opening.

4. The tower crane step-changing device according to claim 1, characterized in that, The tower crane step-changing device also includes a connecting seat (3) on the lower straight web member (62) of the climbing frame (6), and the lower end of the step-changing swing arm (2) is detachably connected to the connecting seat (3).

5. The tower crane step-changing device according to claim 4, characterized in that, The connecting seat (3) includes two connecting ear plates that are spaced apart from each other, and the step-changing swing rod (2) is placed between the two connecting ear plates and is detachably connected by a pin (4).

6. The tower crane step-changing device according to claim 5, characterized in that, The pin (4) is used to connect to the lower straight rod (62) via the connector (5).

7. The tower crane step-changing device according to any one of claims 1 to 6, characterized in that, The inner side of the connecting beam (12) is also provided with an abutment block (121) for abutting against the main chord (63) of the climbing frame (6).

8. The tower crane step-changing device according to any one of claims 1 to 6, characterized in that... The support arm (11) includes an arm body and a connecting rod (112). The connecting rod (112) extends out from the inside of the connecting beam (12). The arm body includes a hinge section (113) that is inclined inward from top to bottom and a locking section (114) that extends vertically from the lower end of the hinge section (113). The joint between the hinge section (113) and the locking section (114) is connected to the end of the connecting rod (112) away from the connecting beam (12). The hinge section (113) is used to hinge with the upper straight web rod (61) of the climbing frame (6). The lower end of the locking section (114) forms the locking opening (111).

9. A tower crane, characterized in that, The tower crane includes a tower crane step-changing device according to any one of claims 1 to 8.

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