An online counterweight device for rocket engine test stand

Abstract

This invention relates to an online counterweight device for a rocket engine test stand, comprising a counterweight frame (1), multiple weights, and a lifting unit (5). The counterweight frame (1) includes an inverted conical cylinder (1.2), and the multiple weights are sequentially arranged from top to bottom within the inner cavity of the inverted conical cylinder (1.2). When the multiple weights are stacked together, their multiple annular sides are coplanar, and the lifting platform (5.1) can be raised or lowered. By sequentially raising or lowering the multiple weights, they sequentially detach from or press against the inner wall of the inverted conical cylinder (1.2). The steel wire rope of the rocket engine test stand is connected to the upper end of the counterweight frame (1). This online counterweight device for a rocket engine test stand can be remotely controlled, eliminating the need for personnel to reach the test site for lifting and manual operation. It features a simple structure, safety, and speed, ensuring the safe conduct of rocket engine tests.

Description

Technical Field

[0001] This invention belongs to the technical field of rocket engine testing equipment, specifically relating to an online counterweight device for a rocket engine test stand. Background Technology

[0002] Because the rocket engine test stand is very far from the remote control room, and the test area must be unmanned during the test, a counterweight is required on the moving frame to ensure the force sensor operates within its optimal accuracy range. During the test, a steel cable suspending the counterweight connects the moving frame and the counterweight device. The rocket engine is mounted on the moving frame, and the impact generated by the engine during the test causes the steel cable to oscillate at high frequencies. Current technology requires on-site replacement of the counterweight on the steel cable, which is cumbersome, time-consuming, labor-intensive, and carries certain operational risks. Existing technology also includes counterweight devices used in other fields. Different masses of weights can be set via guide rods and manually adjusted according to different tests to meet various test data requirements. Buffer pads are added between the weights to reduce the impact force during operation, thus extending the service life of the counterweight device. However, the above counterweight devices have the following disadvantages: 1) The closing and opening of the pins require manual operation, making remote and automatic control impossible; 2) The contact between the counterweight and the guide rod causes friction, affecting the counterweight accuracy, especially unfavorable under high-frequency oscillation conditions. Therefore, there is a need for a wire rope counterweight device with a simple structure that can be remotely controlled to meet the requirements of rocket engine testing. Summary of the Invention

[0003] The purpose of this invention is to provide an online counterweight device for rocket engine test stands, which can be remotely controlled, eliminating the need for personnel to go to the test site for lifting and manual operation. It has a simple structure, is safe and fast, and ensures the safe conduct of rocket engine tests.

[0004] The specific technical solution of this invention is an online counterweight device for a rocket engine test stand, comprising a counterweight frame, multiple weights, and a lifting unit, characterized in that...

[0005] The counterweight frame includes an inverted conical cylinder with an opening at the bottom.

[0006] The multiple weights are arranged sequentially from top to bottom inside the inverted conical cylinder. Each weight is a disc-shaped structure with an annular side that mates with the annular inner wall of the inverted conical cylinder. When the multiple weights are stacked together, the multiple annular side surfaces of the multiple weights are coplanar.

[0007] The lifting unit is located directly below the lower opening of the inverted conical cylinder. The lifting unit includes a lifting platform that can be raised or lowered. By sequentially lifting or lowering multiple weights, the weights are sequentially disengaged from or pressed against the inner wall of the inverted conical cylinder.

[0008] The steel wire rope of the rocket engine test stand is connected to the upper end of the counterweight frame.

[0009] Furthermore, the counterweight frame also includes a suspension cover, the upper part of the inverted conical cylinder has an opening, the suspension cover closes the upper part of the inverted conical cylinder, the surface of the suspension cover has an ear plate and a pin, and the steel wire rope of the rocket engine test stand is connected to the pin.

[0010] Furthermore, there are three weights, namely weight one, weight two, and weight three. Each weight has a protrusion at the center of its upper surface and a recess at the center of its lower surface. The recess of the upper weight can match the protrusion of the lower weight.

[0011] Furthermore, the lifting unit also includes a position sensor, a guide rod, an electric lead screw, a base, and a motor. The base has an upper end plate with a through hole. The electric lead screw passes through the through hole in the upper end plate. The lifting platform is fixed to the upper end of the electric lead screw, which can move up and down under the drive of the motor. One end of the guide rod is fixed to the lower surface of the lifting platform, and the other end passes through a guide hole in the base. The guide rod is parallel to the electric lead screw. The position sensor is used to sense the position of the lifting platform.

[0012] The beneficial effects of this invention are: 1) The online counterweight device for rocket engine test benches of this invention adopts a simple lifting structure, which enables remote control of the counterweight of the wire rope and avoids the danger of personnel replacing the counterweight at close range; 2) It cleverly uses an inverted conical cylinder and weights with inverted conical sides to load the counterweights sequentially; 3) After the counterweights are loaded, there is a gap between the counterweight frame and the weights not involved in the counterweight, ensuring that it does not contact the weights not involved in the counterweight and the lifting unit during high-frequency oscillation; 4) The entire device consists of only an inverted conical cylinder, weights, and a transmission unit, making it simple, economical, and practical. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram (partially cut open) of the online counterweight device for the rocket engine test stand of the present invention;

[0014] Figure 2 This is a front view (vertically cut open) of the counterweight frame of the online counterweight device for the rocket engine test stand of the present invention;

[0015] Figure 3 This is a front view (vertical section) of the weight of the online counterweight device for the rocket engine test stand of the present invention;

[0016] Figure 4This is a front view of the lifting unit of the online counterweight device for rocket engine test bench according to the present invention;

[0017] Among them, the counterweight frame 1, the suspension cover 1.1, and the inverted conical cylinder 1.2,

[0018] Weight 1: 2; Weight 2: 3; Weight 3: 4.

[0019] 5. Lifting unit, 5.1. Lifting platform, 5.2. Position sensor, 5.3. Guide rod, 5.4. Electric lead screw, 5.5. Detailed Implementation

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0021] As attached Figure 1 As shown, an online counterweight device for a rocket engine test stand according to the present invention includes a counterweight frame 1, multiple weights, and a lifting unit 5.

[0022] As attached Figure 2 As shown, the counterweight frame 1 includes a suspension cover 1.1 and an inverted conical cylinder 1.2, which are assembled into one piece by bolts. The lower part of the inverted conical cylinder 1.2 has an opening. The upper part of the inverted conical cylinder 1.2 has an opening, and the suspension cover 1.1 closes the upper part of the inverted conical cylinder 1.2. The surface of the suspension cover 1.1 has a lug and a pin. The steel wire rope of the rocket engine test stand is connected to the pin by a hook.

[0023] As attached Figure 3 As shown, the multiple weights are arranged sequentially from top to bottom in the inner cavity of the inverted conical cylinder 1.2. Each of the multiple weights is a disc-shaped structure and has an annular side that mates with the annular inner wall of the inverted conical cylinder 1.2. When the multiple weights are stacked together, the multiple annular side surfaces of the multiple weights are coplanar.

[0024] As attached Figure 4As shown, the lifting unit 5 includes a lifting platform 5.1, a position sensor 5.2, a guide rod 5.3, an electric lead screw 5.4, a base 5.5, and a motor. The lifting unit 5 is located directly below the lower opening of the inverted conical cylinder 1.2. The lifting platform 5.1 can be raised or lowered, and by sequentially lifting or lowering multiple weights, the weights are sequentially disengaged from or pressed against the inner wall of the inverted conical cylinder 1.2. The base 5.5 has an upper end plate with a through hole with internal threads. The electric lead screw 5.4 passes through the through hole on the upper end plate. The lifting platform 5.1 is fixed to the upper end of the electric lead screw 5.4, which can move up and down under the drive of the motor. One end of the guide rod 5.3 is fixed to the lower surface of the lifting platform 5.1, and the other end passes through a guide hole on the base 5.5. The guide rod 5.3 is parallel to the electric lead screw 5.4. The position sensor 5.2 is used to sense the position of the lifting platform 5.1.

[0025] The steel wire rope of the rocket engine test stand is connected to the upper end of the counterweight frame 1.

[0026] In a specific embodiment of the present invention, there are three weights: weight 1 (2), weight 2 (3), and weight 3 (4). Each weight has a conical protrusion at the center of its upper surface and an inverted conical recess at the center of its lower surface. The recess of the upper weight can mate with the protrusion of the lower weight. Weights 1 (2), 2 (3), and 3 (4) are all inverted frustum-shaped, except for their size. In use, the weights are secured inside the conical cylinder by their conical surfaces, thereby achieving the loading purpose.

[0027] The upper surface of the lifting platform 5.1 is provided with a tapered column that matches the inverted conical hole at the bottom of the weight 3 4. When the lifting platform 5.1 is raised or lowered, the guide rod 5.3 provides constraint to ensure that the lifting platform 5.1 does not tilt during movement and to avoid the electric lead screw 5.4 being subjected to lateral load. The position sensor 5.2 can sense the height position of the lifting platform 5.1. The base 5.5 is fixed on the ground foundation.

[0028] The working process of the device of the present invention is as follows:

[0029] Before the experiment, three weights 2, 3, and 4 were added to the counterweight frame 1 in sequence through the opening at the top of the inverted conical cylinder 1.2. The lifting unit 5 lifted the three weights 2, 3, and 4 one by one. During the lifting process, the conical column on the lifting platform 5.1 and the inverted conical pit on the lower surface of weight 4 cooperated. Then, weight 4 and weight 2, and weight 2 and weight 2 cooperated with the adjacent weights through their respective conical protrusions and inverted conical pits, thus achieving a vertical guiding effect.

[0030] When counterweights are needed, the remote control room of the rocket engine test stand will control the motor to rotate, driving the electric lead screw 5.4 to descend. The screw descends a corresponding distance according to the required weight (this distance is sensed by the position sensor 5.2 and fed back to the remote control room), thereby causing the corresponding number of weights to be locked into the corresponding position inside the inverted conical cylinder 1.2.

[0031] After the test is completed, the remote control room will control the electric lead screw 5.4 to rise and unload the weights one by one.

[0032] While the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the invention. Any equivalent changes or modifications made without departing from the spirit and scope of the invention are also within the scope of protection of the invention. Therefore, the scope of protection of the present invention should be determined by the claims of this application.

Claims

1. An online counterweight device for a rocket engine test stand, comprising a counterweight frame (1), multiple weights, and a lifting unit (5), characterized in that, The counterweight frame (1) includes an inverted conical cylinder (1.2) with an opening at the bottom. The multiple weights are arranged sequentially from top to bottom in the inner cavity of the inverted conical cylinder (1.2). Each of the multiple weights is a disc-shaped structure and has an annular side that mates with the annular inner wall of the inverted conical cylinder (1.2). When the multiple weights are stacked together, the multiple annular side surfaces of the multiple weights are coplanar. Each weight has a protrusion at the center of its upper surface and a recess at the center of its lower surface. The recess of the upper weight can mate with the protrusion of the lower weight. The lifting unit (5) is located directly below the lower opening of the inverted conical cylinder (1.2). The lifting unit (5) includes a lifting platform (5.1), which can be raised or lowered. By sequentially lifting or lowering multiple weights, the multiple weights are sequentially separated from or pressed against the inner wall of the inverted conical cylinder (1.2). The lifting unit (5) further includes a position sensor (5.2), a guide rod (5.3), an electric lead screw (5.4), a base (5.5), and a motor. The base (5.5) has an upper end plate with a through hole with internal threads. The electric lead screw (5.4) passes through the through hole on the upper end plate. The lifting platform (5.1) is fixed to the upper end of the electric lead screw (5.4). The electric lead screw (5.4) can move up and down under the drive of the motor. One end of the guide rod (5.3) is fixed to the lower surface of the lifting platform (5.1), and the other end passes through the guide hole on the base (5.5). The guide rod (5.3) is parallel to the electric lead screw (5.4). The position sensor (5.2) is used to sense the position of the lifting platform (5.1). The steel wire rope of the rocket engine test stand is connected to the upper end of the counterweight frame (1).

2. The online counterweight device for a rocket engine test stand according to claim 1, characterized in that, The counterweight frame (1) also includes a suspension cover (1.1), the upper part of the inverted conical cylinder (1.2) has an opening, the suspension cover (1.1) closes the upper part of the inverted conical cylinder (1.2), the surface of the suspension cover (1.1) has an ear plate and a pin, and the steel wire rope of the rocket engine test stand is connected to the pin.

3. The online counterweight device for a rocket engine test stand according to claim 2, characterized in that, The multiple weights mentioned are three, namely weight one (2), weight two (3) and weight three (4).

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