Cylinder cover switch driving device and launching device

Abstract

The invention relates to the technical field of launching devices, in particular to a barrel cover switch driving device and a launching device. An existing launching device is improved, especially a barrel cover switch driving device is optimized, and the resistance balance structure capable of providing acting force for preventing a piston rod of the hydraulic cylinder from stretching out and drawing back for the telescopic end or the connecting rod structure of the hydraulic cylinder in the negative load process of the hydraulic cylinder is arranged; when the hydraulic cylinder is switched from the positive load state to the negative load state, the resistance balance structure can be triggered, so that certain resistance is provided for continuous stretching or retracting of the piston rod of the hydraulic cylinder, the negative load is counteracted or weakened through the resistance, the energy consumption of the hydraulic system is reduced, the hydraulic system is protected, and the service life of the hydraulic system is prolonged. And meanwhile, hydraulic impact generated during positive and negative load alternation is weakened, so that the positive and negative load alternation process during cover opening and closing is more stable.

Description

Technical Field

[0001] This invention relates to the field of launching device technology, and in particular to a cylinder cover switch driving device and a launching device. Background Technology

[0002] For some types of launching devices, a cover is hinged at the mouth of the launching tube. Before the launcher is launched, the cover needs to be fully opened by a drive mechanism before launching can begin. For example, the launching platform disclosed in Chinese invention patent application CN115854783A has a cover drive mechanism that includes a push assembly mounted on the tube body. The push assembly extends along the tube body, and a guide rail extending along its length is provided on the tube body. A slider is mounted on the guide rail, and a support rod is hinged to the slider. A support block is fixed on the cover, and the support rod is hinged to the support block. The portion between the end of the support block and the hinge point of the cover forms a crank. The support rod acts as a connecting rod, thereby causing the push assembly to rotate the cover by means of a rocker-slider mechanism.

[0003] In actual products, the push-impact assembly often uses a hydraulic cylinder to provide sufficient driving force. However, during the opening and closing of the cylinder cover, gravity causes it to flip from one side of the hinge point to the other. In these two states, the piston of the hydraulic cylinder is subjected to positive pressure (positive load) and negative pressure (negative load) of the hydraulic oil, respectively. Throughout the opening and closing process, positive and negative loads alternate. Given the weight of the cylinder cover, which represents a large inertia load, the piston requires extremely high back pressure under negative load conditions to maintain the smoothness of the cover's flipping. This results in excessive energy consumption and affects the service life of the drive mechanism. Furthermore, the alternation of positive and negative loads can easily cause instability in the hydraulic system, leading to instability in the opening and closing process and affecting normal launch. Summary of the Invention

[0004] The purpose of this invention is to provide a cylinder cover opening and closing drive device to solve the problem in the prior art where, during the cylinder cover flipping process, the center of gravity alternates between the two sides of the hinge point, causing the hydraulic cylinder of the opening and closing drive mechanism to bear alternating positive and negative loads, resulting in poor stability and short lifespan of the hydraulic system.

[0005] Meanwhile, the present invention also aims to provide a launching device to solve the problems of poor stability and short lifespan of the hydraulic system of the cylinder cover switch drive device of the existing launching device.

[0006] The cap switch drive device of the present invention adopts the following technical solution: The cover opening and closing drive device of the present invention includes a hydraulic cylinder that outputs linear reciprocating motion, and a connecting rod structure for connecting the telescopic end of the hydraulic cylinder and the cover. The telescopic end of the hydraulic cylinder and the connecting rod structure constitute a rocker-slider mechanism and drive the cover to flip to realize the opening and closing action. The cover opening and closing drive device also includes a stabilizing and balancing mechanism, which includes a resistance balancing structure for providing resistance to the extension and retraction of the hydraulic cylinder piston rod when the hydraulic cylinder is under a negative load.

[0007] Furthermore, the piston rod of the hydraulic cylinder or its connected components that reciprocate linearly are provided with load-bearing components. The resistance balance structure includes two resistance components spaced apart along the length of the piston rod. The load-bearing components cooperate with the two resistance components during the extension and retraction of the piston rod. When the hydraulic cylinder is in a critical state of alternating positive and negative loads, neither of the two resistance components applies force to the load-bearing components.

[0008] Furthermore, the resistance component is a compression spring with its free ends facing each other and its fixed ends facing away from each other, so as to provide assistance to the telescopic end when the hydraulic cylinder is under positive load, and when the hydraulic cylinder is in the critical state of alternating positive and negative loads, the load-bearing component is located between the free ends of the two compression springs.

[0009] Furthermore, the compression spring is a conical spring.

[0010] Furthermore, the resistance balancing structure is an energy storage-release spring structure, which can provide resistance to the extension and retraction end of the hydraulic cylinder in the opposite direction of its extension and retraction during the negative load process, and can also provide assistance to the extension and retraction end when the hydraulic cylinder is in a positive load state.

[0011] This invention improves upon existing cover opening and closing drive devices by configuring a resistance balancing structure that provides resistance to the extension and retraction of the hydraulic cylinder piston rod when the hydraulic cylinder is under negative load. This resistance balancing structure is triggered when the hydraulic cylinder switches from a positive load state to a negative load state, thereby providing resistance to the continued extension or retraction of the hydraulic cylinder piston rod. This resistance offsets or weakens the negative load, reducing the energy consumption of the hydraulic system and protecting it. It also reduces the hydraulic shock generated during the alternation of positive and negative loads, making the alternation of positive and negative loads during cover opening and closing smoother.

[0012] The launching device of the present invention adopts the following technical solution: The launching device of the present invention includes a launching tube, which includes a tube body and a tube cover rotatably mounted at the tube opening about an axis perpendicular to the tube body. A tube cover opening and closing drive device is mounted on the launching tube. The tube cover opening and closing drive device includes a hydraulic cylinder that outputs linear reciprocating motion and a connecting rod structure for connecting the telescopic end of the hydraulic cylinder and the tube cover. The hydraulic cylinder is mounted on the tube body and extends along the length of the tube body. A guide structure is provided on the tube body for guiding the telescopic end of the hydraulic cylinder in the length of the tube body. The telescopic end and the connecting rod structure constitute a rocker-slider mechanism and drive the tube cover to flip to realize the opening and closing action of the tube cover. The tube cover opening and closing drive device also includes a stabilizing and balancing mechanism. The stabilizing and balancing mechanism includes a resistance balancing structure for providing resistance to the telescopic end of the hydraulic cylinder or the connecting rod structure when the hydraulic cylinder is under a negative load.

[0013] Furthermore, the piston rod of the hydraulic cylinder or its connected components that reciprocate linearly are provided with load-bearing components. The resistance balance structure includes two resistance components spaced apart along the length of the piston rod. The load-bearing components cooperate with the two resistance components during the extension and retraction of the piston rod. When the hydraulic cylinder is in a critical state of alternating positive and negative loads, neither of the two resistance components applies force to the load-bearing components.

[0014] Furthermore, the resistance component is a compression spring with its free ends facing each other and its fixed ends facing away from each other, so as to provide assistance to the telescopic end when the hydraulic cylinder is under positive load, and when the hydraulic cylinder is in the critical state of alternating positive and negative loads, the load-bearing component is located between the free ends of the two compression springs.

[0015] Furthermore, the compression spring is a conical spring.

[0016] Furthermore, the resistance balancing structure is an energy storage-release spring structure, which can provide resistance to the extension and retraction end of the hydraulic cylinder in the opposite direction of its extension and retraction during the negative load process, and can also provide assistance to the extension and retraction end when the hydraulic cylinder is in a positive load state.

[0017] This invention improves upon existing launching devices, particularly optimizing the cover opening and closing drive mechanism. By configuring a resistance balancing structure that provides resistance to the extension and retraction of the hydraulic cylinder piston rod when the hydraulic cylinder is under negative load, the resistance balancing structure is triggered when the hydraulic cylinder switches from a positive load state to a negative load state. This provides resistance to the continued extension or retraction of the hydraulic cylinder piston rod, thereby offsetting or weakening the negative load, reducing the energy consumption of the hydraulic system, protecting the hydraulic system, and also reducing the hydraulic shock generated during the alternation of positive and negative loads, making the alternation of positive and negative loads during cover opening and closing smoother. Attached Figure Description

[0018] Figure 1This is a simplified structural diagram of one embodiment of the launching device of the present invention; Figure 2 This is a simplified structural diagram of another embodiment of the launching device of the present invention.

[0019] In the diagram: 1. Cylinder body; 10. Cylinder cover; 2. Hydraulic cylinder; 20. Piston rod; 21. Connecting rod; 22. Rocker arm; 23. Load-bearing component; 3. Resistance balance structure; 30. Spring seat; 32. Compression spring; 4. Tension spring. Detailed Implementation

[0020] This invention addresses the problem that existing launch device cover switch drive mechanisms suffer from alternating positive and negative loads during the cover flipping process. This is because the cover's center of gravity shifts alternately on both sides of the flipping axis, causing the hydraulic cylinder to alternate between positive and negative loads during both the extension / retraction of the cover to open and the retraction / pull-back of the cover. During the entire extension / retraction process under negative load, the hydraulic system needs to provide significant back pressure to the piston to ensure stable cover flipping, resulting in high power consumption. Furthermore, the hydraulic shock is substantial during the transition between positive and negative loads, making the hydraulic system susceptible to damage and causing unstable cover flipping.

[0021] By optimizing the cover opening and closing drive device and configuring a stable balancing mechanism, the resistance balancing structure provides a force to the extension and retraction of the hydraulic cylinder piston rod when the hydraulic cylinder is under negative load. This counteracts or weakens the negative load, thereby reducing the energy consumption of the hydraulic system, protecting the hydraulic system, and reducing the hydraulic shock generated when positive and negative loads alternate, making the process of alternating positive and negative loads during cover opening and closing more stable.

[0022] Specifically, the following description, in conjunction with the accompanying drawings, illustrates different embodiments of the launching device in order to explain the present invention.

[0023] The first embodiment of the launching device, such as Figure 1 As shown, the launching device includes a launching tube, which includes a tube body 1 and a tube cover 10 rotatably mounted at the tube opening about an axis perpendicular to the tube body 1. In use, the launching tube is in a vertical state or a slightly inclined upward state. The tube cover 10 is hinged to the radial side of the tube opening, and when closed, it can completely seal the tube opening, and when opened, it can be flipped to the side of the tube opening to completely open the tube opening.

[0024] The launch tube is equipped with a cover switch drive device that drives the cover 10 to flip. The cover switch drive device includes a hydraulic cylinder 2 mounted on the side wall of the tube body 1. The hydraulic cylinder 2 is connected to the oil supply line of the hydraulic system. The hydraulic cylinder 2 extends along the length of the tube body 1, and the piston rod 20 extends upward out of the cylinder body. A guide rail extending parallel to its axis is fixedly mounted on the tube body 1. A slider is connected to the end of the piston rod 20, and the slider slides in a guide-sliding engagement with the guide rail. The guide rail is preferably a constricted groove shape, and the slider is slidably installed in the constricted groove and constrained by the guide rail to only have the degree of freedom to slide along its extension direction. Of course, in another embodiment, the guide rail can be a dovetail slide rail, and the slider is a dovetail slider that cooperates with it, so that the slider can only slide in the extension direction of the slide rail.

[0025] A connecting rod 21 structure connects the slider and the cylinder cover 10. The connecting rod 21 structure specifically includes a connecting rod 21 with one end hinged to the slider, and a connecting frame rod with one end fixedly connected to the cylinder cover 10 or the rotating shaft of the cylinder cover 10. The end of the connecting rod and the end of the connecting rod 21 are hinged together, and the rotation axis of the cylinder cover 10, the hinge axis of the connecting rod 21 and the connecting frame rod, and the hinge axis of the connecting rod 21 and the slider are parallel. Thus, the part from the hinge axis of the cylinder cover 10 to the end of the connecting rod and the connecting rod 21 that is hinged together constitutes the rocker arm 22. The connecting rod 21 structure and the slider constitute the rocker arm 22 slider mechanism.

[0026] During the process of the cover 10 moving from the closed position to the open position, the piston rod 20 of the hydraulic cylinder 2 is always extended. When the cover is opened, the center of gravity of the cover 10 is on the side of its axis of rotation closer to the cylinder 1. The piston rod 20 of the hydraulic cylinder 2 extends and drives the slider to move linearly. The rocker arm 22 swings around the hinge axis of the cover 10, thereby causing the cover 10 to start to flip outward. At this time, the piston of the hydraulic cylinder 2 needs to overcome the gravity of the cover 10 and drive it to flip. The piston is subjected to a positive load. When the cover 10 flips to a position where its center is directly above its axis of rotation, it is the critical point between positive and negative load. When the cover 10 continues to flip so that its center of gravity is on the side of its axis of rotation away from the cylinder 1, the gravity of the cover 10 provides the power to continue to flip. The piston is subjected to a momentary negative load until the cover 10 flips to the open position. During the process of the piston being subjected to a negative load, in order to ensure that the cover 10 can flip smoothly, it is necessary to overcome the effect of the negative load on the piston.

[0027] During the process of the cover 10 moving from the open position to the closed position, the piston rod 20 of the hydraulic cylinder 2 is constantly retracting. When the cover is closed, the center of gravity of the cover 10 is on the side away from the cylinder 1 on its axis of rotation. The piston rod 20 of the hydraulic cylinder 2 retracts and drives the slider to move linearly. The rocker arm 22 swings around the hinge axis of the cover 10, thereby causing the cover 10 to start to flip inward. At this time, the piston of the hydraulic cylinder 2 needs to overcome the gravity of the cover 10 and drive it to flip. The piston is subjected to a positive load. When the cover 10 flips to a position where its center is directly above its axis of rotation, it is the critical point between positive and negative load. When the cover 10 continues to flip so that its center of gravity is on the side closer to the cylinder 1 on its axis of rotation, the gravity of the cover 10 provides the power to continue to flip. The piston is subjected to a momentary negative load until the cover 10 flips to the closed position. During the process of the piston being subjected to a negative load, in order to ensure that the cover 10 can flip smoothly, it is necessary to overcome the effect of the negative load on the piston.

[0028] The cylinder cover opening and closing drive device also includes a stabilizing and balancing mechanism. This mechanism includes a resistance balancing structure 3 that provides resistance to the extension and retraction of the piston rod 20 of the hydraulic cylinder 2 when the hydraulic cylinder 2 is under negative load. This resistance counteracts or weakens the negative load, thereby solving the aforementioned technical problem. The resistance balancing structure 3 is triggered at the critical moment when the hydraulic cylinder 2 switches from positive load to negative load, eliminating or weakening the hydraulic shock generated during the alternation of positive and negative loads.

[0029] like Figure 1 In the illustrated embodiment, the resistance balancing structure 3 acts on the telescopic end of the hydraulic cylinder 2, i.e., the piston rod 20 or the slider connected to the end of the piston rod 20. Specifically, a load-bearing member 23 extending to one side, such as a load-bearing plate or a load-bearing rod, is connected to the piston rod 20. The resistance balancing structure 3 includes a mounting bracket fixedly installed on the cylinder 1. Spring seats 30 are provided at intervals along the length of the cylinder 1 on the mounting bracket. Compression springs 32 extending along the length of the cylinder 1 are respectively installed on the two spring seats 30. The fixed ends of the two compression springs 32 are opposite to each other, and their free ends are opposite to each other. The load-bearing member 23 cooperates with the compression springs 32.

[0030] With the cylinder cover 10 closed, the piston rod 20 is in a retracted state. The load-bearing member 23 pushes the lower compression spring 32 into a compressed state and disengages it from the upper compression spring 32, storing elastic potential energy. During the process of the piston rod 20 of the hydraulic cylinder 2 extending and causing the cylinder cover 10 to flip to a position corresponding to its center of gravity and its axis of rotation (i.e., the critical position of positive and negative load), the piston of the hydraulic cylinder 2 is under positive load. The load-bearing member 23 moves upward as the piston rod 20 extends, and the lower compression spring 32 releases its elastic potential energy, providing assistance to the hydraulic cylinder 2. When the cylinder cover 10 flips to the critical position of positive and negative load, the lower compression spring 32 extends to its natural state, its elastic potential energy is fully released, and the load-bearing member 23 disengages from or is about to disengage from the lower compression spring 32. As the telescopic cylinder continues to extend, the cylinder cover 10 flips from the critical position between positive and negative loads into the negative load process. At this moment, the load-bearing component 23 continues to move upward with the piston rod 20 and applies pressure to the upper compression spring 32. The upper compression spring 32 provides resistance to the piston rod 20. By selecting the elastic coefficient of the upper compression spring 32, the elastic resistance can be made close to or equal to the negative load, thus weakening or eliminating the impact of the negative load on the hydraulic system. There is no need to provide a large back pressure to the piston, eliminating hydraulic shock. The piston rod 20 continues to extend and continuously pushes the cylinder cover 10 to flip. During this process, the upper compression spring 32 is continuously compressed and stores energy until the cylinder cover 10 is in the open state.

[0031] During the process of the piston rod 20 of hydraulic cylinder 2 retracting to flip the cylinder cover 10 to the position corresponding to the center of gravity and its axis of rotation (i.e., the critical position of positive and negative load), the piston of hydraulic cylinder 2 is under positive load. The load-bearing component 23 moves downward with the retraction of the piston rod 20, and the upper compression spring 32 releases its elastic potential energy and provides assistance to hydraulic cylinder 2. When the cylinder cover 10 flips to the critical position of positive and negative load, the upper compression spring 32 extends to its natural state, and the elastic potential energy is fully released. The load-bearing component 23 disengages from the upper compression spring 32 or is about to disengage. The telescopic cylinder continues to retract, and the cylinder cover 10 flips from the critical position of positive and negative load into the negative load process. At this time, the load-bearing component 23 continues to move downward with the piston rod 20 and applies pressure to the lower compression spring 32. The lower compression spring 32 provides resistance to the piston rod 20. By selecting the elastic coefficient of the lower compression spring 32, the elastic resistance can be made close to or equal to the negative load, thereby weakening or eliminating the influence of the negative load on the hydraulic system. There is no need to provide a large back pressure to the piston, thus eliminating hydraulic shock. As the piston rod 20 continues to retract, it pulls the cylinder cover 10 to flip over. During this process, the lower compression spring 32 is continuously compressed and stored energy until the cylinder cover 10 is in the closed state.

[0032] As can be seen from the above introduction, the use of compression spring 32 as the resistance balancing structure 3 can not only provide resistance to the extension and retraction of hydraulic cylinder 2 during the negative load process to balance the negative load, but also provide resistance to the extension and retraction of hydraulic cylinder 2 during the positive load process to overcome the positive load. Therefore, the whole structure plays a role in stabilizing the flipping action of cylinder cover 10 and balancing the positive and negative loads.

[0033] The compression spring 32 can be either a cylindrical spring or a conical spring. When a cylindrical spring is used, its axial compression range is larger, and it can better ensure axial compression without being easily twisted.

[0034] In such Figure 2 In the illustrated embodiment, the resistance balancing structure 3 acts on the piston rod 20. Specifically, a spring seat 30 is fixedly installed on the side of the piston rod 20 on the cylinder 1. A spring hanging hole is provided at the outer end of the piston rod 20 (the part that is always outside the cylinder during the entire extension and retraction process). A tension spring 4 is connected between the spring seat 30 and the spring hanging hole. The position of the spring seat 30 satisfies the following conditions: when the cylinder cover 10 is in the closed state, that is, when the piston rod 20 is in the retracted state, the tension spring 4 is in the stretched energy storage state; when the cylinder cover 10 is at the critical position of positive and negative loads, the tension spring 4 is perpendicular to the piston rod 20 and is in its shortest or natural length state; after the cylinder cover 10 changes from positive load to negative load, the tension spring 4 is stretched from its shortest or natural length state, balancing the negative load on the one hand and storing energy on the other. The process of the cylinder cover 10 flipping from the open state to the closed state is the reverse of the above process.

[0035] As can be seen from the different embodiments described above, when the resistance balance structure 3 is a spring structure, the spring structure releases energy to provide assistance during the positive load process and stores energy to balance the negative load during the negative load process. Therefore, the resistance balance structure 3 is an energy storage-release spring structure.

[0036] In the different embodiments described above, the resistance balancing structure 3 acts on the piston rod 20 or the slider. In another embodiment, the resistance balancing structure 3 can be a torsion spring installed at the rotating shaft of the cylinder cover 10. One end of the torsion spring is fixed to the rotating mounting seat of the rotating shaft, which is fixedly installed with the cylinder body 1, and the other end is fixed to the rotating shaft of the cylinder cover 10. There are two sets of torsion springs. The two sets of torsion springs provide elastic resistance for the continued rotation of the rotating shaft during the negative load rotation stroke during the opening and closing process of the cylinder cover 10, that is, provide elastic resistance for the extension and retraction of the cylinder piston rod 20, thereby weakening or overcoming the influence of the negative load; at the same time, they provide assistance for the continued rotation of the rotating shaft during the positive load rotation stroke during the opening and closing process of the cylinder cover 10.

[0037] In the embodiments described above, the resistance balance structure is a metal spring structure. Of course, in other embodiments, other elastic structures that can play the role of energy storage and energy release of a spring can also be called energy storage and energy release spring structures, such as hydraulic dampers that rely on spring reset.

[0038] Of course, the present invention does not limit the resistance balancing structure to a spring structure. In other embodiments, the resistance balancing structure may only provide resistance during the negative load process and not provide assistance during the positive load process. For example, some hydraulic dampers that do not have a self-resetting function need to be reset by other external drives after the resistance balancing structure has completed the balancing of the negative load, so as to prepare resistance for the next negative load process.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A cylinder cover opening and closing drive device, comprising a hydraulic cylinder outputting linear reciprocating motion, and a connecting rod structure for connecting the telescopic end of the hydraulic cylinder and the cylinder cover, wherein the telescopic end of the hydraulic cylinder and the connecting rod structure constitute a rocker-slider mechanism and drive the cylinder cover to flip to realize the opening and closing action of the cover, characterized in that, The cylinder cover switch drive device also includes a stabilizing and balancing mechanism, which includes a resistance balancing structure for providing resistance to the extension and retraction of the hydraulic cylinder piston rod when the hydraulic cylinder is under a negative load.

2. The cylinder cover opening and closing drive device according to claim 1, characterized in that, The piston rod of the hydraulic cylinder or its connected components that reciprocate linearly are provided with load-bearing components. The resistance balance structure includes two resistance components spaced apart along the length of the piston rod. The load-bearing components cooperate with the two resistance components during the extension and retraction of the piston rod. When the hydraulic cylinder is in a critical state of alternating positive and negative loads, neither of the two resistance components applies force to the load-bearing components.

3. The cylinder cover switch driving device according to claim 2, characterized in that, The resistance component is a compression spring with its free ends facing each other and its fixed ends facing away from each other, so that it can provide assistance to the telescopic end when the hydraulic cylinder is under positive load. When the hydraulic cylinder is in a critical state of alternating positive and negative loads, the load-bearing component is located between the free ends of the two compression springs.

4. The cylinder cover switch drive device according to claim 3, characterized in that, The compression spring is a conical spring.

5. The cylinder cover opening and closing drive device according to claim 1, characterized in that, The resistance balancing structure is an energy storage-release spring structure, which can provide resistance to the extension and retraction end of the hydraulic cylinder in the opposite direction of its extension and retraction during the negative load process, and can also provide assistance to the extension and retraction end when the hydraulic cylinder is in a positive load state.

6. A launching device, comprising a launching tube, the launching tube including a tube body and a tube cover rotatably mounted at the tube opening about an axis perpendicular to the tube body, a tube cover opening / closing drive device mounted on the launching tube, the tube cover opening / closing drive device including a hydraulic cylinder outputting linear reciprocating motion, and a connecting rod structure for connecting the telescopic end of the hydraulic cylinder and the tube cover, the hydraulic cylinder being mounted on the tube body and extending along the length direction of the tube body, the tube body being provided with a guide structure for guiding the telescopic end of the hydraulic cylinder along the length direction of the tube body, the telescopic end and the connecting rod structure forming a rocker-slider mechanism and driving the tube cover to flip to realize the opening / closing action, characterized in that... The cylinder cover switch drive device also includes a stabilizing and balancing mechanism, which includes a resistance balancing structure for providing resistance to the extension and retraction of the hydraulic cylinder piston rod when the hydraulic cylinder is under a negative load.

7. The launching device according to claim 6, characterized in that, The piston rod of the hydraulic cylinder or its connected components that reciprocate linearly are provided with load-bearing components. The resistance balance structure includes two resistance components spaced apart along the length of the piston rod. The load-bearing components cooperate with the two resistance components during the extension and retraction of the piston rod. When the hydraulic cylinder is in a critical state of alternating positive and negative loads, neither of the two resistance components applies force to the load-bearing components.

8. The launching device according to claim 7, characterized in that, The resistance component is a compression spring with its free ends facing each other and its fixed ends facing away from each other, so that it can provide assistance to the telescopic end when the hydraulic cylinder is under positive load. When the hydraulic cylinder is in a critical state of alternating positive and negative loads, the load-bearing component is located between the free ends of the two compression springs.

9. The launching device according to claim 8, characterized in that, The compression spring is a conical spring.

10. The launching device according to claim 6, characterized in that, The resistance balancing structure is an energy storage-release spring structure, which can provide resistance to the extension and retraction end of the hydraulic cylinder in the opposite direction of its extension and retraction during the negative load process, and can also provide assistance to the extension and retraction end when the hydraulic cylinder is in a positive load state.

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