Rocket pry steel pipe lasso friction brake device

Abstract

The present application relates to the technical field of rocket pry test, in particular to a rocket pry steel pipe cable friction braking device, comprising: a composite slide rail, a guide, a braking assembly and a transition guide assembly. The composite slide rail comprises a steel pipe and a steel cable, the steel pipe is coaxially sleeved outside the steel cable, and the inner wall of the steel pipe is adhesively fixed on the steel cable. The braking assembly comprises a braking clamp, a friction pair and an elastic member, the friction pair is used to contact the steel pipe, and the elastic member adjusts the radial compression force of the braking clamp to realize friction braking. The transition guide assembly comprises a transition guide head and a detachable sleeve, which ensures smooth transition. The above-mentioned rocket pry steel pipe cable friction braking device relies on friction to complete deceleration braking, realizes low overload, high stability and low cost braking deceleration of the rocket pry.

Description

Technical Field

[0001] This invention relates to the field of rocket skid testing technology, and specifically to a friction braking device for a rocket skid steel tube sleeve. Background Technology

[0002] The suspension rocket sled is a high-speed ground effect avoidance test platform. By using two cables as rails in the air, the rocket sled is located between the two suspension cables. Driven by the engine, the rocket sled moves directionally along the cables. This design effectively avoids the negative impact of ground effect on the stability of the rocket sled, but there are still significant technical bottlenecks in the braking process.

[0003] Currently, the mainstream braking solutions mainly employ drogue chute or sandbox braking. Using a drogue chute for rocket sled braking involves the sled moving to a designated position and connecting to the drogue chute, relying on the chute's aerodynamic drag to complete braking. This braking solution has the following drawbacks: Excessive initial braking overload. Due to the high speed at which the rocket sled connects to the drogue chute, the instantaneous braking overload is excessive, causing damage to the rocket sled and propeller; interference between the drogue lines and the cableway. The drogue chute's attitude is uncontrollable, and during braking, the drogue chute lines are at risk of entanglement and wear failure with the track, preventing the rocket sled from braking and causing economic losses; high braking cost. The manufacturing cost of the drogue chute is also high, making drogue chute braking a costly solution for rocket sled braking.

[0004] Chinese patent application CN 118746219 A discloses a ground-based rocket sled simulation device, in which a sandbox is used as the end-of-line braking device for the rocket deceleration module. This device has the following drawbacks: the rocket impacts the sand pile at high speed, resulting in excessive braking overload, which can easily damage the rocket body and propulsion unit; the rocket's braking attitude in the sand pile is uncontrollable, easily inducing instability and ejection, damaging the experimental device; and the recovery efficiency is low, with complex recovery procedures after braking. Summary of the Invention

[0005] The technical problem to be solved by this invention is to overcome the shortcomings and defects mentioned in the background art above, and to provide a friction braking device for rocket skid steel pipe sleeve with smooth and controllable deceleration braking force. To solve the above technical problem, the technical solution proposed by this invention is as follows: A friction braking device for a rocket skid with a steel pipe and cable includes: a composite slide rail comprising a steel pipe and a steel cable, wherein the steel pipe is coaxially sleeved on the outside of the steel cable, and the inner wall of the steel pipe is bonded and fixed to the steel cable; The guide component is fixedly connected to the front end of the rocket body and is used to guide the rocket body. Braking assembly: includes a brake clamp, a friction pair, and an elastic element. The brake clamp includes an upper brake clamp and a lower brake clamp arranged opposite each other. The brake clamp forms a cylindrical tube opening and is fixed to the tail of the rocket body. The inner walls of the upper and lower brake clamps are fixed with friction pairs. The upper and lower brake clamps are fixed by bolts. The bolts are fitted with elastic elements. The radial clamping force of the brake clamp is adjusted by the elastic elements. The hardness of the friction pair is less than the hardness of the steel pipe. Transition guide assembly: includes a transition guide head and a detachable sleeve. The sleeve is detachably located inside the brake clamp. The transition guide head is fixed to the connection between the steel cable and the steel pipe. The diameter of the transition guide head gradually decreases from the steel pipe end to the sleeve end. The diameter of the steel pipe end is equal to that of the steel pipe. The diameter of the sleeve end is greater than the inner diameter of the sleeve and smaller than the inner diameter of the cylindrical tube opening of the brake clamp.

[0006] In one embodiment, the guide member is a guide clamp, which is composed of an upper guide clamp and a lower guide clamp arranged opposite to each other, and has a detachable guide sleeve inside.

[0007] In one embodiment, the guide clamp and brake clamp are connected to the rocket body by welding or bolting.

[0008] In one embodiment, both the sleeve and the guide sleeve have protruding slots at their front ends, which are respectively engaged in the brake clamp and the guide clamp. After being impacted by the transition guide head, they are pushed out of the brake clamp and the guide clamp and then detached from the steel cable.

[0009] In one embodiment, the sleeve and guide sleeve are polytetrafluoroethylene (PTFE) tubes, or the sleeve and guide sleeve are PTFE tubes lined with graphite. In another embodiment, the steel pipe and the steel cable are bonded together with epoxy resin.

[0010] In one embodiment, the friction pair is made of a composite resin formed from resin and wear-resistant copper wire, and is fixed to the inner surface of the brake clamp by countersunk screws.

[0011] In one embodiment, the transition guide head is made of high manganese steel, with an inner diameter larger than that of the steel cable, and is fixed to the steel cable by epoxy resin bonding.

[0012] In one embodiment, the transition guide head is made of high manganese steel and is fixed to the steel cable by epoxy resin bonding.

[0013] In one embodiment, the elastic element is a butterfly spring.

[0014] In one embodiment, the composite slide rail is composed of a steel cable and multiple steel pipe sections, each steel pipe section being 8-12m long and spaced 10-20mm apart.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In the above-mentioned rocket skid steel pipe cable friction braking device, the braking force is provided by the sliding friction between the friction pair inside the brake clamp and the steel pipe. The braking force can be maintained at a constant value, the braking process is smooth and controllable, and the instantaneous impact overload when using a deceleration parachute can be avoided, which would damage the rocket skid body and the test product carried by the braking overload impact; the guide clamp maintains guidance throughout the entire process, and the brake clamp circumferentially wraps around the steel pipe to form a radial constraint, ensuring that the rocket body does not wobble or deviate from the track throughout the braking process; by adjusting the preload of the disc spring on the brake clamp, the interference fit between the brake clamp and the steel pipe is controlled, thereby realizing the control of the braking force of the rocket skid; the only consumable component of this braking device is the friction pair, resulting in low manufacturing cost. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a rocket skid steel pipe sleeve friction braking device according to one embodiment.

[0018] Figure 2 This is a schematic diagram of a brake clamp structure in one embodiment.

[0019] Figure 3 This is a side view of a rocket skid steel pipe sleeve friction braking device according to one embodiment.

[0020] Reference numerals: 1: Upper guide clamp; 2: Lower guide clamp; 3: Rocket body; 4: Upper brake clamp; 5: Lower brake clamp; 6: Steel cable; 7: Transition guide head; 8: Steel pipe; 9: Elastic element; 10: Sleeve; 11: Bolt; 12: Friction pair; 13: Rocket skid; 14: Steel cable support; 15: Guide sleeve. Detailed Implementation

[0021] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0022] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0023] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0024] Please see Figure 1-3 One embodiment of the rocket skid steel pipe cable friction braking device mainly includes: a composite slide rail, a guide component, a braking assembly, and a transition guide assembly. The composite slide rail includes a steel cable 6 and a steel pipe 8, with the steel pipe 8 coaxially sleeved on the outside of the steel cable 6, and the inner wall of the steel pipe 8 bonded and fixed to the steel cable 6. The guide component is fixedly connected to the front end of the rocket body 3 for guiding the rocket body 3. The braking assembly includes a brake clamp, an elastic element 9, and a friction pair 12. The brake clamp is fixed to the tail of the rocket body 3 and includes an upper brake clamp 4 and a lower brake clamp 5 arranged opposite each other, forming a cylindrical tube opening. The upper brake clamp 4 and the lower brake clamp 5 are fixed by bolts 11, and the elastic element 9 is sleeved on the bolts 11. The friction pair 12 is fixed to the inner wall of the upper brake clamp 4 and the lower brake clamp 5. The hardness of the friction pair 12 is less than that of the steel pipe 8. When the braking assembly enters the steel pipe section, the brake clamp and the steel pipe 8 form an interference fit. Friction braking force is generated by friction between the friction pair 12 and the steel pipe 8. The radial clamping force of the brake clamp is adjusted by the elastic element 9. The transition guide assembly includes a transition guide head 7 and a detachable sleeve 10. The sleeve 10 can be detached and located inside the brake clamp to protect the steel cable 6 from frictional damage by the brake clamp. The transition guide head 7 is fixed at the junction of the steel cable 6 and the steel pipe 8. The diameter of the transition guide head 7 gradually decreases from the end of the steel pipe to the end of the sleeve. The diameter of the end of the steel pipe is equal to that of the steel pipe 8. The diameter of the end of the sleeve is greater than the inner diameter of the sleeve 10 and smaller than the inner diameter of the cylindrical tube opening of the brake clamp. It is used to guide the rocket skid into the steel pipe section while pushing the sleeve 10 out from the inside of the brake clamp.

[0025] Specifically, in one embodiment, the guide component is a guide clamp, which consists of an upper guide clamp 1 and a lower guide clamp 2 arranged opposite to each other, and has a detachable guide sleeve 15 inside. The guide clamp is fixed to the front of the rocket body 3 and is used for guiding the rocket body 3. Specifically, the guide clamp and the brake clamp are connected to the rocket body 3 by welding or bolting.

[0026] Preferably, the front ends of the sleeve 10 and the guide sleeve 15 are provided with protruding latches, which are respectively engaged in the brake clamp and the guide clamp. After being impacted by the transition guide head 7, they are pushed out of the brake clamp and the guide clamp and detached from the steel cable 6. The sleeve 10 and the guide sleeve 15 are made of polytetrafluoroethylene, i.e., polytetrafluoroethylene tubes. Preferably, the sleeve 10 and the guide sleeve 15 are lined with graphite, which can further reduce friction.

[0027] Preferably, the composite slide rail consists of a steel cable 6 and multiple steel pipe sections 8, each 8-12m long, with a spacing of 10-20mm between each section. The steel pipes 8 and the steel cable 6 are bonded together with epoxy resin. Preferably, the transition guide head 7 is made of high manganese steel and is fixed to the steel cable 6 by epoxy resin bonding.

[0028] Specifically, the hardness of friction pair 12 is less than that of steel pipe 8. Friction pair 12 is made of a composite resin formed from resin and wear-resistant copper wire. During the friction braking process with steel pipe 8, the damaged component is friction pair 12. After completing one experiment, friction pair 12 can be replaced. Friction pair 12 is fixed to the inner surface of the brake clamp by countersunk screws.

[0029] Preferably, the elastic element 9 is a butterfly spring.

[0030] The working process of the above-mentioned rocket skid steel pipe sleeve friction braking device is as follows: First, steel pipe 8 and steel cable 6 are installed between steel cable supports 14. Epoxy resin is used to bond steel pipe 8 and steel cable 6 to ensure that there is no relative slippage between them during braking. A transition guide head 7 is installed at the junction of the end of steel cable 6 and steel pipe 8, and is fixed to steel cable 6 using epoxy resin. The brake clamp is fixed to the tail of rocket body 3, and the guide clamp is fixed to the front of rocket body 3. A sleeve 10 is installed inside the brake clamp, and a guide sleeve 15 is installed inside the guide clamp. The front ends of both sleeve 10 and guide sleeve 15 have protruding locking designs. Before the rocket skid 13 travels into the steel pipe section, sleeve 10 and guide sleeve 15 are fixed to the brake clamp and guide clamp respectively by the locking designs. The rocket skid 13 accelerates at high speed in the steel cable section using engine thrust, and the guide sleeve 15, in cooperation with the steel cable 6, provides guidance with minimal frictional resistance. When the brake clamp is running on the steel cable section, the sleeve 10 also acts as a guide mechanism, protecting the steel cable 6 and maintaining a low-friction state. When the rocket skid 13 reaches the end of the steel cable 6, because the outer diameter of the sleeve end of the transition guide head 7 is larger than the inner diameter of the guide sleeve 15 and the inner diameter of the sleeve 10, the guide sleeve 15 first impacts the transition guide head 7. The impact force causes the front end of the guide sleeve 15 to bulge out of the locking jaw, pushing the guide sleeve 15 out of the guide clamp and detaching it from the steel cable 6. Subsequently, the sleeve 10 inside the brake clamp also impacts the transition guide head 7, similarly causing the locking jaw to malfunction and pushing the sleeve 10 out of the brake clamp and detaching it from the steel cable 6. At this time, the friction pair 12 inside the brake clamp rubs against the steel pipe 8, entering the braking state. At this time, the brake clamp and the steel pipe 8 form an interference fit, and the elastic element 9 is compressed, applying radial clamping force to the brake clamp. The friction pair 12 continuously slides and rubs against the surface of the steel pipe 8, generating constant resistance, thus achieving braking and deceleration of the rocket skid 13.

[0031] The rocket skid steel pipe cable friction braking device provides braking force through the sliding friction between the friction pair 12 inside the brake clamp and the steel pipe 8. The braking force can be maintained at a constant value, and the braking process is smooth and controllable, which can avoid damage to the rocket skid body and the test product carried by braking overload impact. The guide clamp maintains guidance throughout the process, and the brake clamp circumferentially wraps around the steel pipe 8 to form radial constraint, ensuring that the rocket body 3 does not wobble or deviate from the track throughout the braking process. By adjusting the pre-tightness of the elastic element 9 on the brake clamp, the interference fit between the brake clamp and the steel pipe 8 is controlled, so as to achieve smooth control of the braking force of the rocket skid 13.

[0032] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A friction braking device for a rocket skid steel pipe sleeve, characterized in that, include: Composite slide rail: It consists of a steel pipe and a steel cable. The steel pipe is coaxially sleeved on the outside of the steel cable, and the inner wall of the steel pipe is bonded and fixed to the steel cable. The guide component is fixedly connected to the front end of the rocket body and is used to guide the rocket body. Braking assembly: includes a brake clamp, a friction pair, and an elastic element. The brake clamp includes an upper brake clamp and a lower brake clamp arranged opposite each other. The brake clamp forms a cylindrical tube opening and is fixed to the tail of the rocket body. The inner walls of the upper and lower brake clamps are fixed with friction pairs. The upper and lower brake clamps are fixed by bolts. The bolts are fitted with elastic elements. The radial clamping force of the brake clamp is adjusted by the elastic elements. The hardness of the friction pair is less than the hardness of the steel pipe. Transition guide assembly: includes a transition guide head and a detachable sleeve, the sleeve being detachably located inside the brake clamp, the transition guide head being fixed at the connection between the steel cable and the steel pipe, the diameter of the transition guide head gradually decreasing from the steel pipe end to the sleeve end, and the diameter of the steel pipe end being equal to that of the steel pipe, the diameter of the sleeve end being greater than the inner diameter of the sleeve and smaller than the inner diameter of the cylindrical tube opening of the brake clamp; The guide component is a guide clamp, which consists of an upper guide clamp and a lower guide clamp arranged opposite to each other, and has a detachable guide sleeve inside; The front ends of the sleeve and the guide sleeve are provided with protruding bayonets, which are respectively engaged in the brake clamp and the guide clamp. After being impacted by the transition guide head, they are pushed out of the brake clamp and the guide clamp and then detached from the steel cable. At this point, the friction pair inside the brake clamp rubs against the steel pipe, entering the braking state.

2. The rocket skid steel pipe sleeve friction braking device according to claim 1, characterized in that, The guide clamp and brake clamp are connected to the rocket body by welding or bolting.

3. The rocket skid steel pipe sleeve friction braking device according to claim 1, characterized in that, The sleeve and guide sleeve are made of polytetrafluoroethylene (PTFE) tubes, or the sleeve and guide sleeve are made of PTFE tubes lined with graphite.

4. The rocket skid steel pipe sleeve friction braking device according to claim 1, characterized in that, The steel pipe and steel cable are bonded together with epoxy resin.

5. The rocket skid steel pipe sleeve friction braking device according to claim 1, characterized in that, The friction pair is made of a composite resin formed from resin and wear-resistant copper wire, and is fixed to the inner surface of the brake clamp by countersunk screws.

6. The rocket skid steel pipe sleeve friction braking device according to claim 1, characterized in that, The transition guide head is made of high manganese steel and is fixed to the steel cable by epoxy resin bonding.

7. The rocket skid steel pipe sleeve friction braking device according to claim 1, characterized in that, The elastic element is a butterfly spring.

8. The rocket skid steel pipe sleeve friction braking device according to claim 1, characterized in that, The composite slide rail is composed of steel cables and multiple steel pipes, each steel pipe being 8-12m long, with a spacing of 10-20mm between each steel pipe.

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