Lifting system for launching vehicle

Abstract

The utility model discloses a lifting system for a launching vehicle, which relates to the technical field of lifting systems and comprises a support frame, two ball screws are mounted in the support frame, and nuts on the two ball screws are connected with a lifting platform. According to the lifting system for the launching vehicle, the transmission efficiency is improved by adopting the ball screw, the motor is connected with the damper through the one-way bearing, when the platform ascends, the servo motor does work, and the damper does not move; when the platform descends, the damper is driven, gravitational potential energy is consumed, efficient ascending of the platform is achieved through the ball screw, the one-way bearing drives the damper to achieve safe descending of the platform, stopping at any position can be achieved, and stability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting systems, in particular to a lifting system for a launching vehicle. Background Art

[0002] The launch vehicle lifting system is a launch platform for rockets, which can adjust the height of the launch platform according to the launch requirements of the rocket. In the prior art, the height adjustment of the launch platform will realize the up and down movement of the platform by driving the trapezoidal screw through the motor reducer. This method has low working efficiency. The transmission efficiency of the trapezoidal screw is about 35%. It relies on the on-board battery for power supply, which limits the motor power and causes insufficient power when the system is lifted. At the same time, the trapezoidal screw and the nut are in sliding friction and are lubricated with grease, which causes the friction coefficient to be greatly affected by temperature. The transmission efficiency of the trapezoidal screw is lower at low temperatures, resulting in power overload, which makes the height adjustment of the launch platform extremely unstable and unsafe. For this reason, the present application proposes a lifting system for a launch vehicle to solve the above problems. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the utility model provides a lifting system for a launch vehicle, which solves the technical problems raised in the above background.

[0005] (II) Technical solution

[0006] To achieve the above purpose, the technical solution adopted by the utility model is: a lifting system for a launch vehicle, including a support frame, two ball screws are installed in the support frame, the nuts on the two ball screws are connected to the lifting platform, the bottom ends of the two ball screws are connected to the bevel gear transmission box, a servo motor is installed on the bottom side of the support frame, the output shaft of the servo motor is connected to the reducer, and the reducer shafts on both sides of the reducer are connected to the two gear transmission boxes through the transmission shaft, and the reducer shaft on the bottom side of the reducer is connected to the one-way bearing, and the one-way bearing is connected to the damper structure.

[0007] Preferably, the damper structure is composed of a hydraulic pump, a relief valve and a small oil tank, and the hydraulic pump is connected to the reducer shaft at the bottom side of the reducer, and the hydraulic pump, the relief valve and the small oil tank are annularly connected through an oil pipe.

[0008] Preferably, the one-way bearing inner ring of the one-way bearing is connected to the reducer shaft at the bottom side of the reducer, and the one-way bearing outer ring of the one-way bearing is connected to the hydraulic pump shaft.

[0009] Preferably, the rated power of the hydraulic pump is 750W.

[0010] Preferably, the rotational speed of the hydraulic pump and the servo motor is 1200 rpm.

[0011] (III) Beneficial effects

[0012] The beneficial effects of the utility model are:

[0013] The lifting system for the launch vehicle has improved transmission efficiency by adopting a ball screw. The motor and the damper are connected by a one-way bearing. When the platform rises, the servo motor does work while the damper does not move. When the platform descends, the damper is driven to consume gravitational potential energy, thereby achieving efficient platform ascent by the ball screw. The one-way bearing drives the damper to achieve safe descent of the platform, and the platform can be stopped at any position with higher stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the planar structure of the utility model;

[0015] Figure 2 This is an enlarged structural diagram of the one-way bearing of the utility model;

[0016] Figure 3 It is a hydraulic schematic diagram of the damper of the utility model.

[0017] In the figure: 1 support frame, 2 ball screw, 3 nut, 4 lifting platform, 5 bevel gear transmission box, 6 servo motor, 7 reducer, 8 one-way bearing, 81 one-way bearing inner ring, 82 one-way bearing outer ring, 9 damper structure, 91 hydraulic pump, 92 overflow valve, 93 small oil tank. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1-3As shown, the utility model provides a technical solution: a lifting system for a launch vehicle, including a support frame 1, the support frame 1 is installed on the launch vehicle, two ball screws 2 are installed in the support frame 1, the nuts 3 on the two ball screws 2 are connected to the lifting platform 4, the balls are located between the screw rods and the nuts 3 of the ball screws 2, and the friction is reduced by rolling, so as to realize efficient and smooth transmission between the ball screws 2 and the nuts 3, the bottom ends of the two ball screws 2 are connected to the bevel gear transmission box 5, and a servo is installed on the bottom side of the support frame 1 Motor 6, the output shaft of servo motor 6 is connected to reducer 7, and the reducer shafts on both sides of reducer 7 are connected to two gear transmission boxes 5 through transmission shafts, and the reducer shaft on the bottom side of reducer 7 is connected to one-way bearing 8, the one-way bearing inner ring 81 of one-way bearing 8 is connected to the reducer shaft on the bottom side of reducer 7, the one-way bearing outer ring 82 of one-way bearing 8 is connected to the shaft of hydraulic pump 91 and the one-way bearing 8 is connected to the damper structure 9, the one-way bearing inner ring 81 of one-way bearing 8 is connected to the reducer shaft on the bottom side of reducer 7, the one-way shaft of one-way bearing 8 The outer ring 82 of the bearing is connected to the shaft of the hydraulic pump 91. The damper structure 9 is composed of the hydraulic pump 91, the overflow valve 92 and the small oil tank 93. The servo motor 6 is connected to the damper structure 9 through the one-way bearing 8. When the platform rises, the servo motor 6 works, and the shaft of the hydraulic pump 91 of the damper structure 9 does not move; when the platform descends, the shaft of the hydraulic pump 91 of the damper structure 9 is driven to consume the gravitational potential energy. The damper structure 9 consumes energy when the lifting platform 4 descends, and can also play a self-locking role, because the lifting platform 4 is raised and lowered. It is not very frequent, so the closed hydraulic oil can maintain a relatively stable temperature through natural heat dissipation, and will not fail due to excessive temperature, thereby achieving efficient ascent of the lifting platform 4 and safe descent, and the lifting platform 4 can be stopped at any position, and the hydraulic pump 91 is connected to the reducer shaft on the bottom side of the reducer 7, and the hydraulic pump 91, the overflow valve 92 and the small oil tank 93 are connected in an annular manner through an oil pipe. The rated power of the hydraulic pump 91 is 750W, and the speed of the hydraulic pump 91 and the servo motor 6 is 1200 rpm.

[0020] Example

[0021] The lifting platform of a launch system requires a load of 600 kg, a stroke of 700 mm, a lifting time of 10 seconds, and the weight of the movable part of the platform itself is 200 kg, so its useful power is 560 watts, and the efficiency of the reducer is about 80%. If a trapezoidal screw is used, its efficiency is about 35%, so the motor power should not be less than 2 kilowatts. If a ball screw is used, its efficiency is 90%, and the motor power is 778 watts, but the ball screw cannot be self-locking;

[0022] A closed damping system is formed by using a hydraulic pump 91, a relief valve 92, a small oil tank 93, and an oil pipe. The rated power of the hydraulic pump 91 is 750W, the speed range of the hydraulic pump 91 and the speed of the servo motor 6 are about 1200 rpm, and the motor torque required for the lifting platform 4 to rise is about 10Nm. When preventing the lifting platform 4 from descending, a reverse torque of 3Nm is required. Figure 1 The shaft of the servo motor 6 is connected to the shaft of the hydraulic pump 91. At this time, by adjusting the knob of the overflow valve 92, the system pressure can be adjusted, thereby adjusting the torque of the hydraulic pump 91, and adjusting the rotational torque of the hydraulic pump 91 to 3Nm. By utilizing the performance of the one-way bearing 8, the lifting platform 4 rises and the servo motor 6 mainly overcomes gravity to do work, driving the two ball screws 2 to rotate to achieve the lifting of the lifting platform 4, which is relatively efficient; the damper structure of the lifting platform 4 descends and consumes energy, and can also play a self-locking role. Because the lifting platform 4 is not raised and lowered very frequently, the closed hydraulic oil can maintain a relatively stable temperature through natural heat dissipation, and will not fail due to excessive temperature, thereby achieving efficient ascent of the lifting platform 4 and safe descent, and the lifting platform 4 can be stopped at any position.

[0023] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the present invention, unless otherwise clearly stipulated and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lifting system for a launch vehicle, comprising a support frame (1), characterized in that: Two ball screws (2) are installed in the support frame (1), the nuts (3) on the two ball screws (2) are connected to the lifting platform (4), the bottom ends of the two ball screws (2) are connected to the bevel gear transmission box (5), a servo motor (6) is installed on the bottom side of the support frame (1), the output shaft of the servo motor (6) is connected to the reducer (7), and the reducer shafts on both sides of the reducer (7) are connected to the two gear transmission boxes (5) through the transmission shaft, and the reducer shaft on the bottom side of the reducer (7) is connected to the one-way bearing (8), and the one-way bearing (8) is connected to the damper structure (9).

2. A launching vehicle lifting system according to claim 1, characterized in that: The damper structure (9) is composed of a hydraulic pump (91), a relief valve (92) and a small oil tank (93), and the hydraulic pump (91) is connected to the reducer shaft at the bottom side of the reducer (7), and the hydraulic pump (91), the relief valve (92) and the small oil tank (93) are annularly connected through an oil pipe.

3. A launching vehicle lifting system according to claim 2, characterized in that: The one-way bearing inner ring (81) of the one-way bearing (8) is connected to the reducer shaft at the bottom side of the reducer (7), and the one-way bearing outer ring (82) of the one-way bearing (8) is connected to the shaft of the hydraulic pump (91).

4. A launching vehicle lifting system according to claim 2, characterized in that: The rated power of the hydraulic pump (91) is 750W.

5. A launching vehicle lifting system according to claim 2, characterized in that: The rotation speed of the hydraulic pump (91) and the servo motor (6) is 1200 rpm.

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