Tower crane reversing device and reversing method

Abstract

The invention discloses a tower crane reversing device and a reversing method. The problem that the service life is shortened due to frequent forward and reverse rotation of a motor of an existing tower crane is mainly solved. Which comprises a first motor (1) and a second motor (4) and is characterized by further comprising a differential mechanism (2), two differential mechanism input shafts (6) and two differential mechanism output shafts (7) are arranged on the differential mechanism (2), the two differential mechanism input shafts (6) are connected with the first motor (1) and the second motor (4) respectively, and the two differential mechanism output shafts (7) are connected with a first roller (3) and a second roller (5) respectively. The motor in the tower crane reversing device always rotates in one direction, forward and reverse rotation of the roller is achieved through the differential mechanism, the service life of the motor is prolonged, and efficiency and energy conservation are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of oil field production engineering, in particular to a tower crane reversing device and a reversing method. Background Art

[0002] At present, the main transmission method of tower crane is that the motor is connected to the reduction drum through a tire coupling, and the forward and reverse rotation of the motor drives the forward and reverse rotation of the reducer drum. However, frequent forward and reverse rotation of the motor shortens the life of the motor and affects the service life of the tower crane. Summary of the invention

[0003] In order to overcome the problem that the motor of the existing tower crane frequently rotates forward and reverse, thus shortening its life, the present invention provides a tower crane reversing device and a reversing method. In the tower crane reversing device, the motor always rotates in one direction, and a differential is used to realize the forward and reverse rotation of the roller, thereby extending the motor's life and being highly efficient and energy-saving.

[0004] The technical solution of the present invention is: a tower crane reversing device, including a first motor and a second motor, and also including a differential, wherein the differential is provided with two differential input shafts and two differential output shafts, the two differential input shafts are respectively connected to the first motor and the second motor, and the two differential output shafts are respectively connected to the first roller and the second roller.

[0005] The first motor and the second motor are both disc-type permanent magnet motors.

[0006] The differential input shafts are located on the same axis and are symmetrically arranged, and the two differential output shafts are located on the same axis and are symmetrically arranged.

[0007] The differential is provided with a housing, the ends of the differential input shaft and the differential output shaft extend out of the housing, a bearing is provided between the differential output shaft and the housing, and an end cover is provided outside the bearing.

[0008] A control system is also included for controlling the rotation speeds of the first motor and the second motor.

[0009] A tower crane reversing method, when the tower crane is in a downstroke, the control system controls the speed of a first motor to be higher than the speed of a second motor, and the differential drives two rollers to move clockwise; when the tower crane is in an upstroke, the control system controls the speed of the second motor to be higher than the speed of the first motor, and the differential drives the two rollers to move counterclockwise.

[0010] The speed difference between the first motor and the second motor is V=2ins / πD, where V is the speed difference between the two motors, r / min; i is the differential transmission ratio; n is the maximum stroke of the pump, r / min; s is the maximum stroke of the pump, m; and D is the drum diameter, m.

[0011] The present invention has the following beneficial effects: due to the adoption of the above scheme, the upper platform of the tower machine is provided with two permanent magnet motors. When the tower machine is working, the two permanent magnet motors have different rotation speeds, and the drum is rotated clockwise and counterclockwise through the differential, so as to achieve the purpose of reversing the up and down strokes of the tower machine. Since the motor always runs in one direction, the reliability of the motor is improved, the service life of the motor is effectively extended, and the area and weight of the upper platform of the tower machine can be reduced at the same time, and the transmission effect is better, so that the tower machine can achieve high efficiency and energy saving, and stepless adjustment of the stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a schematic diagram of the differential.

[0013] In the figure, 1-first motor, 2-differential, 3-first roller, 4-second motor, 5-second roller, 6-differential input shaft, 7-differential output shaft, 8-bearing, 9-end cover. Implementation

[0014] The present invention will be further described below in conjunction with the accompanying drawings: Depend on Figure 1 , Figure 2 As shown, a tower crane reversing device includes a first motor 1 and a second motor 4, both of which are disc-type permanent magnet motors. It also includes a differential 2, on which two differential input shafts 6 and two differential output shafts 7 are provided, the two differential input shafts 6 are located on the same axis and are symmetrically arranged, and the two differential output shafts 7 are also located on the same axis and are symmetrically arranged, and the gears of each differential input shaft 6 are respectively meshed with the gears of the two differential output shafts 7. The two differential input shafts 6 are respectively connected to the first motor 1 and the second motor 4, and the two differential output shafts 7 are respectively connected to the first roller 3 and the second roller 5.

[0015] The differential 2 is provided with a housing, the gear ends of the differential input shaft 6 and the differential output shaft 7 are located in the housing, the other end of the differential input shaft 6 extends out of the housing and is connected to the motor; a bearing 8 is provided between the differential output shaft 7 and the housing, an end cover 9 is provided outside the bearing 8, and the other end of the differential output shaft 7 extends out of the housing and is connected to the drum. The tower crane reversing device also includes a control system for controlling the start and stop and speed of the first motor 1 and the second motor 4.

[0016] A tower crane reversing method, when the tower crane is in a downstroke, the control system controls the speed of the first motor 1 to be higher than the speed of the second motor 4, so that the differential 2 drives the two rollers to move clockwise; when the tower crane is in an upstroke, the control system controls the speed of the second motor 4 to be higher than the speed of the first motor 1, so that the differential 2 drives the two rollers to move counterclockwise, thereby achieving the purpose of reversing the up and down strokes of the tower crane. The speed difference between the above two motors is V=2ins / πD, where V is the speed difference between the two motors, r / min; i is the differential transmission ratio; n is the maximum stroke of the pumping unit, r / min; s is the maximum stroke of the pumping unit, m; D is the roller diameter, m.

[0017] The tower crane commutation method does not require the motor to rotate forward or reverse, and the motor always runs in one direction, which effectively prolongs the service life of the motor and improves the reliability of the motor. At the same time, it can reduce the area and weight of the platform on the tower crane, and has a better transmission effect, thereby achieving high efficiency and energy saving of the tower crane and stepless adjustment of the stroke. Example

[0018] WCYJD10-8-25Z tower pumping unit: differential transmission ratio i is 3, maximum stroke n is 3r / min, maximum stroke s is 8m, drum diameter D is 0.5m. The maximum motor speed difference V=2ins / πD=2×3×3×8 / 3.14 / 0.5=92r / min.

[0019] WCYJD6-4-10Z tower pumping unit: differential transmission ratio i is 3, maximum stroke n is 5r / min, maximum stroke s is 4m, drum diameter D is 0.4m. The maximum motor speed difference V=2ins / πD=2×3×5×4 / 3.14 / 0.4=95r / min.

[0020] WCYJD20-10-88Z tower pumping unit: differential transmission ratio i is 3, maximum stroke n is 2r / min, maximum stroke s is 10m, drum diameter D is 0.5m. The maximum motor speed difference V=2ins / πD=2×3×2×10 / 3.14 / 0.5=77r / min.

Claims

1. A tower crane reversing device, comprising a first motor (1) and a second motor (4), characterized in that: The invention also comprises a differential (2), wherein the differential (2) is provided with two differential input shafts (6) and two differential output shafts (7), wherein the two differential input shafts (6) are respectively connected to the first motor (1) and the second motor (4), and the two differential output shafts (7) are respectively connected to the first roller (3) and the second roller (5).

2. The tower crane reversing device according to claim 1, characterized in that: The first motor (1) and the second motor (4) are both disc-type permanent magnet motors.

3. The tower crane reversing device according to claim 2, characterized in that: The differential input shaft (6) is located on the same axis and is arranged symmetrically, and the two differential output shafts (7) are located on the same axis and are arranged symmetrically.

4. The tower crane reversing device according to claim 3, characterized in that: The differential (2) is provided with a housing, the ends of the differential input shaft (6) and the differential output shaft (7) extend out of the housing, a bearing (8) is provided between the differential output shaft (7) and the housing, and an end cover (9) is provided outside the bearing (8).

5. The tower crane reversing device according to claim 4, characterized in that: It also includes a control system for controlling the rotation speeds of the first motor (1) and the second motor (4).

6. A reversing method using the tower crane reversing device according to claims 1-5, characterized in that: When the tower crane is in a downward stroke, the control system controls the speed of the first motor (1) to be higher than the speed of the second motor (4), and the differential (2) drives the two rollers to move clockwise; when the tower crane is in an upward stroke, the control system controls the speed of the second motor (4) to be higher than the speed of the first motor (1), and the differential (2) drives the two rollers to move counterclockwise.

7. The tower crane reversing method according to claim 6, characterized in that: The speed difference between the first motor (1) and the second motor (4) is V=2ins / πD, where V is the speed difference between the two motors, r / min; i is the differential transmission ratio; n is the maximum stroke of the pumping unit, r / min; s is the maximum stroke of the pumping unit, m; and D is the drum diameter, m.

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