Rotary sling for bridge construction

Abstract

The present invention belongs to the field of bridge construction, and specifically discloses a rotary sling for bridge construction, which includes an upper cross beam, a rotary member, and a lower cross beam arranged in sequence from top to bottom; the rotary member includes an upper support, a slewing drive mechanism, and a lower support arranged in sequence from top to bottom, and the slewing drive mechanism is used to drive the lower support to rotate relative to the upper support; a lifting mechanism is installed on the upper cross beam, and the lifting mechanism includes a turntable rotatably connected to the upper cross beam and a rotation drive member fixed on the upper cross beam for driving the turntable to rotate. Two sets of lifting components for lifting the workpiece upward are distributed along the radial direction of the turntable, and the lifting components include lifting drive members; an installation cavity is formed in the lower cross beam, a lever is installed in the installation cavity, mercury switches are installed at both ends of the lever, and first hooks are hinged at both ends of the lever. By adopting the solution of the present invention, the problem that the workpiece needs to be rotated to the required angle in the horizontal plane during the hoisting process can be solved.

Description

Technical Field

[0001] The present invention belongs to the field of bridge construction, and particularly relates to a rotary sling for bridge construction. Background Art

[0002] When erecting a suspension bridge, it is necessary to first complete the construction of the pier towers on both sides of the bridge and the construction of the main load-bearing cable in the longitudinal direction of the bridge, and then hoist the steel box girder section by section, and connect the steel box girder with the main cable by a suspension cable to form a bridge. The length of the steel box girder is generally greater than the distance between the pier towers on both sides. Therefore, when hoisting the steel box girder, it is generally necessary to hoist the steel box girder in the longitudinal direction of the bridge. However, after the steel box girder is hoisted to the required position, it is necessary to install the steel box girder in the transverse direction of the bridge. Therefore, it is necessary to rotate the steel box girder at this time.

[0003] In the prior art, the sling includes an upper cross beam, a rotating member and a lower cross beam arranged in sequence from top to bottom. The upper cross beam is used to connect with a crane, the lower cross beam is used to hoist a workpiece, and the rotating member is used to drive the lower cross beam to rotate relative to the upper cross beam. The structural settings of the rotating members are different, such as being driven by gears, synchronous belts, worm gears, etc. When the lower cross beam hoists a workpiece, due to the different shapes and weights of the workpieces, the forces on both ends of the lower cross beam may be different, which may cause the end of the lower cross beam with a heavier force to have a downward pulling tendency. And when one end of the lower cross beam pulls down the rotating member, it will cause the connection between the rotating member and the lower cross beam to shift, resulting in a decrease in the rotation drive accuracy at best and damage to the rotating member at worst. Summary of the Invention

[0004] Aiming at the deficiencies in the prior art, the present invention provides a rotary sling for bridge construction to solve the problem that when the lower cross beam hoists a workpiece, due to the different shapes and weights of the workpieces, the forces on both ends of the lower cross beam may be different, which may cause the end of the lower cross beam with a heavier force to have a downward pulling tendency.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] Rotary sling for bridge construction, comprising an upper crossbeam, a rotating member and a lower crossbeam arranged in sequence from top to bottom. The upper crossbeam is used to connect with a crane, the lower crossbeam is used to hoist workpieces, and the rotating member is used to drive the lower crossbeam to rotate relative to the upper crossbeam; A lifting mechanism is installed on the upper crossbeam. The lifting mechanism includes a turntable rotatably connected to the upper crossbeam and a rotation driving member fixed on the upper crossbeam for driving the turntable to rotate. The rotation axis of the turntable coincides with the rotation axis of the lower crossbeam. Two sets of lifting components for lifting the workpiece upward are distributed along the radial direction of the turntable. The lifting component includes a first hook and a lifting driving member for driving the first hook to lift; An installation cavity is opened in the lower crossbeam, installation holes communicating with the installation cavity are opened on both sides of the lower end of the lower crossbeam, a lever is installed in the installation cavity, mercury switches are installed at both ends of the lever, the triggering points of the two mercury switches are arranged in opposite directions, the mercury switches are electrically connected to the lifting driving member on the same side as them, second hooks are hinged at both ends of the lever, and the second hooks extend out of the lower crossbeam through the installation holes.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] The workpiece is hoisted by the first hook and the second hook at the same time. In the initial state, only the second hook is stressed, and the stress of the second hook is transmitted to the lever. When the forces on both ends of the lever are unbalanced, the end of the lever with heavier stress deflects downward, and the mercury switch at this end of the lever is triggered. The mercury switch turns on the lifting driving member on the same side as it, and the lifting driving member drives the first hook to make an upward lifting movement, giving an upward force to this end of the workpiece, reducing the downward stress at this end of the lower crossbeam, and then gradually restoring the balance of the lever, and the mercury switch closes, and the first hook stops moving. By applying an upward lifting force to the end of the lower crossbeam with heavier stress by the upper crossbeam, the stresses at both ends of the lower crossbeam are balanced to a certain extent.

[0009] When the lower crossbeam rotates, the turntable is driven to rotate synchronously, and the lifting components located on the turntable rotate synchronously, so that the first hook can rotate synchronously with the workpiece. Description of the Drawings

[0010] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0011] Figure 2 is Figure 1 The enlarged view of part A in

[0012] Figure 3 It is a cross-sectional view of the lower crossbeam in an embodiment of the present invention.

[0013] In the figure: 1. upper crossbeam; 2. pull rod; 3. lower crossbeam; 4. workpiece; 5. second lifting hook; 6. turntable; 7. rotating shaft; 8. steel wire rope; 9. limit wheel; 10. support rod; 11. first lifting hook; 12. connecting plate; 13. transition plate; 14. upper support; 15. slewing motor; 16. driving gear; 17. lower support; 18. slewing bearing; 19. through hole; 20. lever; 21. mercury switch; 22. mounting hole; 23. mounting cavity. Detailed implementation manners

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings of the specification, and specific implementation manners are given.

[0015] As Figure 1 、 Figure 2 shown, a rotary hoist for bridge construction includes an upper crossbeam 1, a rotating member, and a lower crossbeam 3 arranged in sequence from top to bottom. The upper crossbeam 1 is used to connect to a crane, and the connection method is prior art and will not be elaborated in this embodiment. The lower crossbeam 3 is used to hoist the workpiece 4, and the rotating member is used to drive the lower crossbeam 3 to rotate relative to the upper crossbeam 1, so that the lower crossbeam 3 drives the workpiece 4 to complete the rotation of the required angle.

[0016] The rotating member includes an upper support 14, a slewing drive mechanism, and a lower support 17 arranged in sequence from top to bottom. The upper support 14 is used to connect to the upper crossbeam 1. Specifically, the upper crossbeam 1 and the upper support 14 are connected by an upper connecting member. The upper connecting member includes a connecting plate 12 fixed on the upper crossbeam 1 and a transition plate 13 pin-connected to the connecting plate 12. The lower end of the transition plate 13 is pin-connected to the upper support 14. The axis of the pin shafts connecting the transition plate 13 and the connecting plate 12, and the transition plate 13 and the upper support 14 are perpendicular to each other in the horizontal plane.

[0017] The slewing drive mechanism is used to drive the lower support 17 to rotate relative to the upper support 14. Specifically, the slewing drive mechanism includes a slewing bearing 18 and a slewing drive member. The inner ring of the slewing bearing 18 is fixed to the upper support 14, and the outer ring of the slewing bearing 18 is fixed to the lower support 17. The slewing drive member is installed on the upper support 14 and is used to drive the outer ring of the slewing bearing 18 to rotate. Specifically, the slewing drive member includes a slewing motor 15 fixed on the upper support 14 and a driving gear 16 fixed on the output shaft of the slewing motor 15. A driven gear meshing with the driving gear 16 is fixed on the outer ring of the slewing bearing 18. By driving the driving gear 16 to rotate by the slewing motor 15, the driven gear is driven to rotate, and then the outer ring of the slewing bearing 18 is driven to rotate, realizing the rotation of the lower support 17.

[0018] The lower support 17 is used to connect with the lower cross beam 3. Specifically, the lower cross beam 3 and the lower support 17 are connected by a lower connecting member. The lower connecting member includes two pull rods 2 respectively hinged at the two ends of the lower support 17. The pull rod 2 has a telescopic function. Specifically, the pull rod 2 includes a fixed part and a telescopic part. The telescopic part is hollow and threadedly connected to the fixed part. By rotating the telescopic part, the telescopic part moves relative to the fixed part, thereby adjusting the length of the pull rod 2. In actual use, the pull rod 2 can also use an electric telescopic rod or other rod body with a telescopic function in the prior art. By adjusting the length of the pull rod 2 and the angle between the two pull rods 2, it can be suitable for lifting workpieces 4 of different sizes. When the lengths of the two pull rods 2 are inconsistent, it can also meet the requirements of inclined lifting of some workpieces 4. The lower end of the pull rod 2 and the lower cross beam 3 are detachably connected. Specifically, a mounting plate is hinged at the lower end of the pull rod 2, and the mounting plate is connected to the lower cross beam 3 by high-strength bolts. Lower cross beams 3 of different sizes can be selected according to the size of the workpiece 4. The pull rod 2 and the lower cross beam 3 form a triangular structure, which improves the stability of the lifting and prevents the pull rod 2 from shaking during the lifting process.

[0019] Through the connection between the connecting plate 12, the transition plate 13 and the upper support 14, the upper support 14 can be rotated arbitrarily in the vertical plane relative to the upper beam 1. Regardless of whether the upper beam 1 and the crane remain in a horizontal state after being connected, the upper support 14 can be in a vertical state, and the axis of the slewing bearing 18 connected to the upper support 14 can always remain in a vertical state, so as to control the rotation angle of the lower beam 3 and the force on the lower beam 3.

[0020] The upper crossbeam 1 is provided with a lifting mechanism, which includes a turntable 6 rotatably connected to the upper crossbeam 1 and a rotating driving member fixed to the upper crossbeam 1 for driving the turntable 6 to rotate. A through hole 19 is provided in the middle of the turntable 6 for the rotation member to pass through. After the rotation member passes through the through hole 19, any part of the rotation member does not contact the inner wall of the through hole 19 to avoid mutual interference. The rotation axis of the turntable 6 coincides with the rotation axis of the lower crossbeam 3. The rotating driving member is a rotating motor, and the output shaft of the rotating motor and the turntable 6 are connected by conventional transmission methods in the prior art (e.g., gear transmission).

[0021] Two groups of lifting components for lifting the workpiece 4 upward are distributed along the radial direction of the turntable 6. The lifting components include a first hook 11 and a lifting drive component for driving the first hook 11 to lift. Specifically, the lifting component includes a rotating shaft 7 rotatably connected to the turntable 6. The axis of the rotating shaft 7 is perpendicular to the rotation axis of the lower cross beam 3. A steel wire rope 8 is fixed and wound on the rotating shaft 7. The first hook 11 is fixed on the steel wire rope 8. The lifting drive component is used to drive the rotating shaft 7 to rotate. The lifting drive component uses a lifting motor fixed on the turntable 6, and the output shaft of the lifting motor is fixed to the rotating shaft 7.

[0022] The lower crossbeam 3 is provided with a support mechanism for supporting the steel wire rope 8. There are two groups of support mechanisms, which correspond to the two groups of lifting components respectively. The support mechanism includes a support rod 10 obliquely installed on the lower crossbeam 3 and a limit wheel 9 rotatably connected to the end of the support rod 10. An annular groove for the steel wire rope 8 to be caught is formed on the limit wheel 9. The steel wire rope 8 is limited through the annular groove. The width of the annular groove is greater than the outer diameter of the steel wire rope 8, which can avoid the steel wire rope 8 from shaking to a certain extent during hoisting. The upper ends of the two support rods 10 are inclined in opposite directions. The steel wire rope 8 is supported by the support rod 10 to avoid interference between the steel wire rope 8 and the pull rod 2. The support rod 10 is a telescopic rod. The support rod 10 can be an electric telescopic rod or other rod bodies with telescopic functions in the prior art. By adjusting the length of the support rod 10, the position of the steel wire rope 8 can be adjusted, further avoiding interference between the steel wire rope 8 and the pull rod 2. To avoid interference between the support rod 10 and the pull rod 2, each group of support mechanisms includes two support rods 10, which are respectively located on the front and back sides of the pull rod 2. The two ends of the limit wheel 9 are respectively rotatably connected to the two support rods 10. According to the deflection angle of the pull rod 2, the length of the support rod 10 is adjusted so that the limit wheel 9 and the pull rod 2 do not contact each other.

[0023] Combined with Figure 3 As shown in the figure, an installation cavity 23 is formed in the lower crossbeam 3. Installation holes 22 communicating with the installation cavity 23 are formed on both sides of the lower end of the lower crossbeam 3. A lever 20 is installed in the installation cavity 23. Specifically, a support rod is fixed at the bottom of the installation cavity 23, and the middle of the lever 20 is hinged to the support rod. Mercury switches 21 are installed at both ends of the lever 20. The triggering points of the two mercury switches 21 are arranged in opposite directions. The mercury switch 21 is electrically connected to the lifting drive member on its same side. Second hooks 5 are hinged at both ends of the lever 20. The second hooks 5 extend out of the lower crossbeam 3 through the installation holes 22. To avoid interference between the installation holes 22 and the second hooks 5, the installation holes 22 are designed as strip-shaped holes. In this embodiment, the first hook 11 and the second hook 5 both adopt hoisting structures in the prior art for connecting with the workpiece 4 (such as hooking the workpiece 4 or other connection methods with the workpiece 4), as long as they can drive the workpiece 4 to move together during hoisting.

[0024] During specific use, the first hook 11 and the second hook 5 are simultaneously connected to the workpiece 4. In the initial state, the steel wire rope 8 is in a slack state, that is, the first hook 11 cannot provide an upward pulling force on the workpiece 4, and only the second hook 5 is stressed. The stress of the second hook 5 is transmitted to the lever 20. When the forces on both ends of the lever 20 are unbalanced, the end of the lever 20 with a heavier force deflects downward. The mercury in the mercury switch 21 at this end of the lever 20 rolls towards the lower end of the lever 20 and triggers the switch. The mercury switch 21 turns on the lifting drive member on its same side, that is, the lifting motor on this side drives the rotating shaft 7 to rotate, driving the steel wire rope 8 to wind around the rotating shaft 7, and then driving the first hook 11 to perform an upward lifting movement, giving an upward force to this end of the workpiece 4, reducing the downward force on this end of the lower crossbeam 3, and thus gradually restoring the balance of the lever 20. The mercury switch 21 closes, and the first hook 11 stops moving.

[0025] When hoisting to the position where the workpiece 4 needs to rotate, start the slewing motor 15. The slewing motor 15 drives the driving gear 16 to rotate, driving the driven gear to rotate, and then driving the outer ring of the slewing bearing 18 to rotate, realizing the rotation of the lower support 17. The lower support 17 drives the lower crossbeam 3 to rotate, and thus completes the rotation of the workpiece 4. At the same time, start the rotating motor. The rotating motor drives the turntable 6 to rotate. The turntable 6 drives the lifting assembly and the lower crossbeam 3 to rotate synchronously, preventing the first hook 11 from detaching from the workpiece 4.

[0026] When the workpiece 4 needs to be hoisted obliquely or the upper surface of the workpiece 4 is in an inclined state, adjust the lengths of the two tie rods 2 so that the lower crossbeam 3 is in an inclined state. At this time, the mercury switch 21 at the lower end of the lower crossbeam 3 is triggered, and the lifting motor at this end is started. The first hook 11 gives an upward pulling force to this end of the workpiece 4, to a certain extent preventing the workpiece 4 from sliding downward under the action of its own gravity or pulling the second hook 5 downward. During the actual use process, the start and stop of the lifting motor, the slewing motor 15, and the rotating motor can be remotely controlled by the controller. The lifting motor is also controlled by the mercury switch 21. When the workpiece 4 is hoisted obliquely, since the mercury switch 21 cannot return to the horizontal state by itself, the controller can turn off the lifting motor after the workpiece 4 has been hoisted for a period of time.

[0027] 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 actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. The rotary sling for bridge construction comprises an upper crossbeam, a rotary member and a lower crossbeam which are arranged in sequence from top to bottom. The upper crossbeam is used to connect with a crane, the lower crossbeam is used to hoist workpieces, and the rotary member is used to drive the lower crossbeam to rotate relative to the upper crossbeam. It is characterized in that: A lifting mechanism is installed on the upper crossbeam. The lifting mechanism comprises a turntable rotatably connected to the upper crossbeam and a rotation driving member fixed on the upper crossbeam for driving the turntable to rotate. The rotation axis of the turntable coincides with the rotation axis of the lower crossbeam. Two sets of lifting components for lifting the workpiece upward are distributed along the radial direction of the turntable. The lifting component comprises a first hook and a lifting driving member for driving the first hook to perform a lifting motion. The lifting component comprises a rotating shaft rotatably connected to the turntable. The axis of the rotating shaft is perpendicular to the rotation axis of the lower crossbeam. A steel wire rope is fixed and wound on the rotating shaft. The first hook is fixed on the steel wire rope. The lifting driving member is used to drive the rotating shaft to rotate; An installation cavity is formed in the lower crossbeam. Installation holes communicating with the installation cavity are formed on both sides of the lower end of the lower crossbeam. A lever is installed in the installation cavity. Mercury switches are installed at both ends of the lever. The triggering points of the two mercury switches are arranged in opposite directions. The mercury switches are electrically connected to the lifting driving member on the same side. Second hooks are hinged at both ends of the lever. The second hooks extend out of the lower crossbeam through the installation holes; A support mechanism for supporting the steel wire rope is arranged on the lower crossbeam. There are two sets of support mechanisms which correspond to the two sets of lifting components respectively. The support mechanism comprises a support rod obliquely installed on the lower crossbeam and a limit wheel rotatably connected to the end of the support rod. The upper ends of the two support rods are inclined in opposite directions. An annular groove for the steel wire rope to be clamped into is formed on the limit wheel.

2. The rotary sling for bridge construction according to claim 1, characterized in that: The rotary member comprises an upper support, a slewing drive mechanism and a lower support which are arranged in sequence from top to bottom. The slewing drive mechanism is used to drive the lower support to rotate relative to the upper support. The upper support is used to connect with the upper crossbeam, and the lower support is used to connect with the lower crossbeam.

3. The rotary sling for bridge construction according to claim 2, characterized in that: The slewing drive mechanism comprises a slewing bearing and a slewing drive member. The inner ring of the slewing bearing is fixed to the upper support, and the outer ring of the slewing bearing is fixed to the lower support. The slewing drive member is installed on the upper support and used to drive the outer ring of the slewing bearing to rotate.

4. The rotary sling for bridge construction according to claim 2, characterized in that: The upper crossbeam and the upper support are connected by an upper connecting member. The upper connecting member comprises a connecting plate fixed on the upper crossbeam and a transition plate pin-connected to the connecting plate. The lower end of the transition plate is pin-connected to the upper support. The axis of the pin shafts connecting the transition plate and the connecting plate and the transition plate and the upper support are perpendicular to each other in the horizontal plane.

5. The rotary sling for bridge construction according to claim 2, characterized in that: The lower crossbeam and the lower support are connected by a lower connecting member. The lower connecting member comprises two tie rods respectively hinged at both ends of the lower support. The tie rods have a telescopic function. The lower ends of the tie rods are detachably connected to the lower crossbeam.

6. The rotary sling for bridge construction according to claim 1, characterized in that: The support rod is a telescopic rod.

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