Energy recovery damping slewing mechanism applied to tower crane

Abstract

The application discloses an energy recovery and damping slewing mechanism applied to a tower crane, which comprises a base, a transmission disc, a slewing disc, a hydraulic slewing actuator and an energy recovery mechanism, the transmission disc is rotationally connected with the base, the slewing disc is rotationally connected with the transmission disc, the hydraulic slewing actuator is connected with the slewing disc and the transmission disc respectively, and the energy recovery mechanism is connected with the hydraulic slewing actuator; the base and the slewing disc are respectively used as a tower body connecting mechanism and a boom connecting mechanism. The energy recovery and damping slewing mechanism can reduce the vibration received by the transmission disc, recover and convert part of energy, and improve the safety and stability of the tower crane operation.

Description

Technical Field

[0001] This invention specifically relates to an energy recovery and vibration reduction rotary mechanism for tower cranes. Background Technology

[0002] Currently, most tower cranes use a slewing bearing directly connected to the motor, allowing the motor's output to directly drive the boom's rotation. However, this connection method causes the horizontal vibration of the boom to directly affect the motor and the tower crane itself, thus impacting the safety of tower crane operations. Furthermore, the tower crane boom experiences significant vibrations in windy weather, which can shorten its lifespan, necessitating work stoppages as required. However, using this slewing mechanism can reduce irregular vibrations and wind-induced vibrations of the tower crane boom during operation, thereby improving the safety and stability of tower crane operations.

[0003] To address this problem, this invention develops a tower crane slewing mechanism based on an adjustable-damping hydraulic push rod. This slewing mechanism can reduce the operating vibration and wind-induced vibration of the tower crane boom and recover vibration energy. Therefore, this invention has broad application prospects in improving the safety and stability of tower crane operation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an energy recovery and vibration reduction slewing mechanism for tower cranes, which reduces the vibration of the transmission disc and recovers and converts a portion of the energy, thereby improving the safety and stability of tower crane operation, in order to address the above-mentioned deficiencies in the existing technology.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] An energy recovery and vibration damping slewing mechanism for tower cranes includes a base, a transmission disc, a slewing disc, a hydraulic slewing actuator, and an energy recovery mechanism. The transmission disc is connected to the base via a second slewing bearing, and the slewing disc is connected to the transmission disc via a first slewing bearing. The hydraulic slewing actuator is connected to both the slewing disc and the transmission disc, and the energy recovery mechanism is connected to the hydraulic slewing actuator. The base and the slewing disc serve as the tower body connection mechanism and the boom connection mechanism, respectively.

[0007] According to the above technical solution, the rotary table, transmission plate, and base are arranged sequentially from top to bottom.

[0008] According to the above technical solution, the transmission disc is connected to a drive transmission device.

[0009] According to the above technical solution, the drive transmission device includes a drive motor and a transmission mechanism. The drive motor is fixed on the transmission disk, and the output shaft of the drive motor is connected to the second rotary bearing or the base through the transmission mechanism.

[0010] According to the above technical solution, the transmission mechanism includes a first gear and a second gear. The output shaft of the drive motor is connected to the first gear, and the second gear is sleeved on the second rotary bearing or fixed on the base. The first gear and the second gear mesh.

[0011] According to the above technical solution, the hydraulic rotary actuator includes a hydraulic motor, a generator, multiple hydraulic push rods arranged circumferentially along the transmission disc, a hydraulic rectifier valve group, and an oil tank assembly. The two ends of the hydraulic push rods are connected to the rotary disc and the transmission disc respectively through pins. Each hydraulic push rod is connected in parallel to the two ends of the hydraulic motor through the hydraulic rectifier valve group. The hydraulic rectifier valve group is connected to the oil tank assembly, and the hydraulic motor is connected to the generator.

[0012] According to the above technical solution, there are 4 hydraulic push rods.

[0013] According to the above technical solution, multiple hydraulic push rods are divided into two groups. When the rotary table rotates in the forward direction relative to the transmission plate, one group of hydraulic push rods is compressed and the other group of hydraulic push rods is stretched. When the rotary table rotates in the reverse direction relative to the transmission plate, one group of hydraulic push rods is stretched and the other group of hydraulic push rods is compressed.

[0014] According to the above technical solution, the hydraulic rectifier valve group includes a solenoid valve, a relief valve, and a first check valve and a second check valve for each hydraulic push rod. Each hydraulic push rod is connected to the inlet end of the corresponding first check valve and the outlet end of the corresponding second check valve. The outlet end of each first check valve is connected to one end of the relief valve and to one end of the hydraulic motor through the solenoid valve. The inlet end of each second check valve is connected to the other end of the relief valve and the other end of the hydraulic motor, and is connected to the oil tank assembly.

[0015] According to the above technical solution, the oil tank assembly includes a hydraulic pump, an oil tank, and a return valve. The oil tank is connected to the hydraulic rectifier valve group through the hydraulic pump, and the return valve is connected in parallel to both ends of the hydraulic pump.

[0016] The present invention has the following beneficial effects:

[0017] 1. The basic rotary transmission and vibration reduction structure consists of a transmission disc, a hydraulic rotary actuator, and a turntable. When the transmission disc rotates, it transmits the rotation to the turntable through the hydraulic rotary actuator, reducing irregular vibrations. When the tower crane boom connected to the turntable is subjected to wind vibration, the hydraulic rotary actuator can absorb some of the vibration and store and convert some of the energy through the energy recovery mechanism. This reduces the vibration on the transmission disc and recovers and converts some of the energy, thereby reducing irregular vibrations and wind-induced vibrations of the tower crane boom during operation, thus improving the safety and stability of tower crane operation.

[0018] 2. The basic rotary transmission and vibration damping structure consists of a transmission disc, hydraulic push rods, and a rotary table. When the transmission disc rotates, it transmits rotational energy to the rotary table via the hydraulic push rods, reducing irregular vibrations. When the tower crane boom connected to the rotary table is subjected to wind vibration, the hydraulic push rods absorb some of the vibration, reducing the vibration experienced by the transmission disc. During the rotational transmission between the rotary table and the transmission disc, the push rods of the hydraulic push rods move, causing hydraulic oil to flow into the hydraulic motor after passing through the hydraulic rectifier valve assembly. The hydraulic motor drives the generator, thus realizing the function of recovering vibration energy from the tower crane boom. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the energy recovery and vibration reduction slewing mechanism applied to a tower crane in an embodiment of the present invention;

[0020] Figure 2 This is an exploded schematic diagram of the energy recovery and vibration reduction slewing mechanism applied to a tower crane in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the oil circuit of the hydraulic rotary actuator in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the arrangement of the three-way valve and four-way valve of the hydraulic rotary actuator in the oil circuit in an embodiment of the present invention;

[0023] In the diagram, 1-rotary disc, 2-hydraulic rotary actuator, 3-first rotary bearing, 4-transmission disc, 5-second rotary bearing, 6-base, 7-pin, 8-pin, 9-pin, 10-bearing thrust, 11-large gear, 12-nut, 13-key, 14-bolt, 15-drive motor, 16-nut, 17-nut, 18-pin, 19-nut, 20-solenoid valve, 21-first check valve, 22-second check valve, 23-first hydraulic push rod, 24-first check valve, 25-second check valve, 26-second hydraulic push rod, 27-then... 1. Check valve, 28. Second check valve, 29. Third hydraulic push rod, 30. First check valve, 31. Second check valve, 32. Fourth hydraulic push rod, 33. Return valve, 34. Manual pump, 35. Oil tank, 36. Return valve, 37. Hydraulic motor, 38. Generator, 39. Three-way valve, 40. Three-way valve, 41. Three-way valve, 42. Three-way valve, 43. Three-way valve, 44. Three-way valve, 45. Three-way valve, 46. Three-way valve, 47. Three-way valve, 48. Three-way valve, 48. Four-way valve, 50. Three-way valve. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Reference Figures 1-4As shown, an energy recovery and vibration damping slewing mechanism for a tower crane, according to an embodiment 1 of the present invention, includes a base 6, a transmission disc 4, a slewing disc 1, a hydraulic slewing actuator 2, and an energy recovery mechanism. The transmission disc 4 is connected to the base 6 via a second slewing bearing 5, and the slewing disc 1 is connected to the transmission disc 4 via a first slewing bearing 3. The hydraulic slewing actuator 2 is connected to both the slewing disc 1 and the transmission disc 4, and the energy recovery mechanism is connected to the hydraulic slewing actuator 2. The base 6 and the slewing disc 1 serve as the tower body connection mechanism and the boom connection mechanism, respectively.

[0026] Furthermore, the rotary table 1, transmission disc 4, and base 6 are arranged in parallel from top to bottom; a column is connected to the rotary table or the base. In this embodiment, the column is welded or bolted to the rotary table, the transmission disc is connected to the column of the rotary table through the first rotary bearing, and the base is connected to the column of the rotary table through the second rotary bearing.

[0027] Example 2

[0028] Based on Example 1, the technical features of the drive transmission device are further defined, resulting in Example 2 having even better performance.

[0029] The transmission disc 4 is connected to a drive transmission device.

[0030] Furthermore, the drive transmission device includes a drive motor and a transmission mechanism. The drive motor 5 is fixed on the transmission disk 4, and the output shaft of the drive motor is connected to the second rotary bearing 5 or the base 6 through the transmission mechanism.

[0031] Furthermore, the transmission mechanism includes a first gear and a second gear. The output shaft of the drive motor is connected to the first gear. The second gear is sleeved on the second slewing bearing 5 or fixed on the base 6. The first gear and the second gear mesh. The drive motor drives the first gear to rotate, and the second gear drives the first gear, the drive motor, and the transmission disk 4 to rotate around the second gear in the opposite direction.

[0032] Example 3

[0033] like Figure 3-4 As shown, the hydraulic rotary actuator is further modified based on Examples 1 and 2, resulting in Example 3 having even better performance.

[0034] Furthermore, the hydraulic rotary actuator 2 includes a hydraulic motor, a generator, multiple hydraulic push rods arranged circumferentially along the transmission disc 4, a hydraulic rectifier valve group, and an oil tank assembly. The two ends of the hydraulic push rods are connected to the rotary disc 1 and the transmission disc 4 respectively via pins. Each hydraulic push rod is connected in parallel to both ends of the hydraulic motor via the hydraulic rectifier valve group. The hydraulic rectifier valve group is connected to the oil tank assembly. The hydraulic motor is connected to the inlet and outlet of the hydraulic valve group. The hydraulic motor is connected to the generator via a coupling.

[0035] Furthermore, there are four hydraulic push rods: a first hydraulic push rod 23, a second hydraulic push rod 26, a third hydraulic push rod 29, and a fourth hydraulic push rod 32. The hydraulic rotary actuator consists of four hydraulic push rods arranged on the transmission disc 4, and the hydraulic rectifier valve group is a hydraulic rectifier bridge mainly composed of check valves and solenoid valves. When the rotary disc rotates forward relative to the transmission disc 4, two hydraulic push rods are compressed, and the other two hydraulic push rods are stretched; when the rotary disc rotates in the opposite direction relative to the transmission disc 4, two hydraulic push rods are stretched, and the other two hydraulic push rods are compressed.

[0036] Furthermore, multiple hydraulic push rods are divided into two groups, with the same number of hydraulic push rods in both groups. The two groups of hydraulic push rods are installed in opposite directions. When the rotary table rotates in the forward direction relative to the transmission disk 4, one group of hydraulic push rods is compressed and the other group of hydraulic push rods is stretched. When the rotary table rotates in the reverse direction relative to the transmission disk 4, one group of hydraulic push rods is stretched and the other group of hydraulic push rods is compressed.

[0037] Furthermore, the two sets of hydraulic push rods are spaced apart.

[0038] Furthermore, the hydraulic rectifier valve assembly includes a solenoid valve, a relief valve, and a first check valve and a second check valve for each hydraulic push rod. Each hydraulic push rod is connected to the inlet end of the corresponding first check valve and the outlet end of the corresponding second check valve. The outlet end of each first check valve is connected to one end of the relief valve and to one end of the hydraulic motor through the solenoid valve. The inlet end of each second check valve is connected to the other end of the relief valve and the other end of the hydraulic motor, and is connected to the oil tank assembly.

[0039] Furthermore, the solenoid valves in the hydraulic rectifier valve assembly can be controlled by a controller to control whether the oil circuit is open or closed; the damping of the hydraulic push rod is provided by the load connected to the generator, and the controller can adjust the damping of the hydraulic push rod by adjusting the load.

[0040] Furthermore, the oil tank assembly includes a hydraulic pump, an oil tank, and a return valve. The oil tank is connected to the inlet end of the hydraulic motor, relief valve, and second check valve of the hydraulic rectifier valve assembly via the hydraulic pump. The return valve is connected in parallel to both ends of the hydraulic pump.

[0041] Furthermore, the hydraulic pump is a manual pump.

[0042] The working principle of this invention is as follows: The base 6 and the transmission disk 4 are connected via a slewing bearing 5. The output shaft of the drive motor 15 passes through the transmission disk 4 and is fixed to the transmission disk 4 by bolts 14 and 17. The drive motor 15 and the large gear 11 are connected via a key 13 and a bearing thrust 10. The hydraulic rotary actuator 2 is connected to the transmission disk 4 via a protruding pin on the transmission disk 4. The hydraulic rotary actuator 2 is connected to the rotary disk 1 via a pin 18. The rotary disk 1 and the transmission disk 4 are connected via a slewing bearing 3.

[0043] Reference Figure 3 , 4 As shown in the figure, this embodiment provides a connection diagram of a hydraulic rotary actuator, a hydraulic rectifier valve group, a hydraulic motor, and a generator.

[0044] The first hydraulic push rod 23 is connected to the first check valve 21 and the second check valve 22 via the three-way valve 40; the second hydraulic push rod 26 is connected to the first check valve 24 and the second check valve 25 via the three-way valve 42; the third hydraulic push rod 29 is connected to the first check valve 27 and the second check valve 28 via the three-way valve 44; and the fourth hydraulic push rod 32 is connected to the first check valve 30 and the second check valve 31 via the three-way valve 46.

[0045] Three-way valve 39 is connected to solenoid valve 20, first check valve 21, and three-way valve 41. Three-way valve 41 is connected to three-way valve 39, three-way valve 43, and first check valve 21. Three-way valve 43 is connected to three-way valve 41, three-way valve 45, and first check valve 24. Three-way valve 45 is connected to three-way valve 43, relief valve 33, and first check valve 30.

[0046] The manual pump 34, oil tank 35, and relief valve 36 together constitute the oil tank part of the hydraulic valve group.

[0047] Three-way valve 50 is connected to hydraulic motor 37, second check valve 22, and four-way valve 49. Four-way valve 49 is connected to the oil tank structure consisting of manual pump 34, oil tank 35, and return valve 36, second check valve 25, three-way valve 48, and three-way valve 50. Three-way valve 48 is connected to four-way valve 49 and three-way valve 47. Three-way valve 47 is connected to return valve 33, second check valve 31, and three-way valve 48.

[0048] The output shaft of the hydraulic motor 37 is connected to the generator 38, and the inlet and outlet ports of the hydraulic motor 37 are connected to the solenoid valve 20 and the three-way valve 50, respectively.

[0049] When the tower crane boom rotates, if the rotation transmitted by the drive disc 4 is uneven, or if the boom is affected by wind causing relative rotation between the drive disc 4 and the rotary table 1, two hydraulic push rods will be compressed, while the other two will be stretched. The two hydraulic push rods in the compressed state will generate damping, thereby hindering the relative rotation between the drive disc 4 and the rotary table 1. At the same time, the hydraulic push rods in the compressed state will cause hydraulic oil to flow out through the hydraulic rectifier valve assembly and be transmitted through the hydraulic motor 37. The hydraulic push rods in the stretched state will cause hydraulic oil to flow from the rod chamber through the check valve to the rodless chamber. Therefore, when relative rotation occurs between the drive disc 4 and the rotary table 1, the hydraulic push rods will provide damping, reduce the amplitude of relative rotation, and convert the kinetic energy of the relative rotation into electrical energy through the hydraulic motor 37 and the generator 38, thus achieving energy recovery.

[0050] The above are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent changes made in accordance with the claims of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An energy recovery and vibration damping slewing mechanism applied to a tower crane, characterized in that, It includes a base, a transmission disc, a rotary table, a hydraulic rotary actuator, and an energy recovery mechanism. The transmission disc is rotatably connected to the base, the rotary table is rotatably connected to the transmission disc, the hydraulic rotary actuator is connected to both the rotary table and the transmission disc, and the energy recovery mechanism is connected to the hydraulic rotary actuator. The base and the rotary table serve as the tower body connection mechanism and the boom connection mechanism, respectively. The hydraulic rotary actuator includes a hydraulic motor, a generator, multiple hydraulic push rods arranged circumferentially along the transmission disc, a hydraulic rectifier valve assembly, and an oil tank assembly. The two ends of the hydraulic push rods are connected to the rotary disc and the transmission disc respectively via pins. Each hydraulic push rod is connected in parallel to both ends of the hydraulic motor via the hydraulic rectifier valve assembly. The hydraulic rectifier valve assembly is connected to the oil tank assembly, and the hydraulic motor is connected to the generator.

2. The energy recovery and vibration damping slewing mechanism for tower cranes according to claim 1, characterized in that, The rotary table, transmission disc, and base are arranged in order from top to bottom.

3. The energy recovery and vibration damping slewing mechanism for tower cranes according to claim 1, characterized in that, The transmission disc is connected to a drive transmission device.

4. The energy recovery and vibration damping slewing mechanism for tower cranes according to claim 3, characterized in that, The drive transmission device includes a drive motor and a transmission mechanism. The drive motor is fixed on the transmission disk, and the output shaft of the drive motor is connected to the second slewing bearing or the base through the transmission mechanism.

5. The energy recovery and vibration damping slewing mechanism for tower cranes according to claim 4, characterized in that, The transmission mechanism includes a first gear and a second gear. The output shaft of the drive motor is connected to the first gear, and the second gear is sleeved on the second slewing bearing or fixed on the base. The first gear and the second gear mesh.

6. The energy recovery and vibration damping slewing mechanism for tower cranes according to claim 1, characterized in that, There are 4 hydraulic push rods.

7. The energy recovery and vibration damping slewing mechanism for tower cranes according to claim 1, characterized in that, Multiple hydraulic push rods are divided into two groups. When the rotary table rotates in the forward direction relative to the transmission plate, one group of hydraulic push rods is compressed and the other group of hydraulic push rods is stretched. When the rotary table rotates in the reverse direction relative to the transmission plate, one group of hydraulic push rods is stretched and the other group of hydraulic push rods is compressed.

8. The energy recovery and vibration damping slewing mechanism for tower cranes according to claim 1, characterized in that, The hydraulic rectifier valve assembly includes a solenoid valve, a relief valve, and a first check valve and a second check valve for each hydraulic push rod. Each hydraulic push rod is connected to the inlet end of the corresponding first check valve and the outlet end of the corresponding second check valve. The outlet end of each first check valve is connected to one end of the relief valve and to one end of the hydraulic motor through the solenoid valve. The inlet end of each second check valve is connected to the other end of the relief valve and the other end of the hydraulic motor, and is connected to the oil tank assembly.

9. The energy recovery and vibration damping slewing mechanism for tower cranes according to claim 1, characterized in that, The oil tank assembly includes a hydraulic pump, an oil tank, and a return valve. The oil tank is connected to a hydraulic rectifier valve group via the hydraulic pump, and the return valve is connected in parallel to both ends of the hydraulic pump.

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