An ejection device with adjustable expansion chamber volume

Abstract

This invention discloses an ejection device with an adjustable expansion chamber volume, comprising: a base support, a launch tube, and an ejection controller. The launch tube is mounted on the base support, the expansion chamber is located at the rear of the launch tube, the directional device is located at the head of the launch tube, and the combat load is set inside the directional device. The expansion chamber contains a spring A, a movable base plate, and a limiting device. One end of spring A is connected to the inner bottom surface of the closed end of the expansion chamber, and the other end is connected to surface A of the movable base plate. The limiting device is used to limit the movable base plate. A cavity is formed between surface B of the movable base plate and the bottom surface of the combat load. The ejection controller controls the ejection power source to generate a working medium, which is released into the cavity to generate pressure, thereby ejecting the combat load. This invention can dynamically adjust the expansion chamber volume according to the expansion chamber pressure during the ejection process, reducing overload on the load, avoiding adverse effects on the electronic components of the load, and also reducing the recoil generated by the ejection, thus achieving miniaturization of the ejection device.

Description

Technical Field

[0001] This invention belongs to the field of catapult technology, specifically relating to a catapult device with adjustable expansion chamber volume. Background Technology

[0002] Existing payload ejection technologies include external power source ejection and internal power source ejection. External power source ejection injects working medium into the expansion chamber by making openings in the wall of the launch tube, and establishes pressure in the expansion chamber. Internal power source ejection establishes pressure in the expansion chamber by using the exhaust gas generated by the engine of the payload itself. The pressure in the expansion chamber then acts on the bottom of the payload, generating an ejection force on the payload, which pushes the payload toward the launch tube opening to complete the ejection mission. During the ejection process, the volume of the expansion chamber remains constant.

[0003] However, during the ejection process, due to the high pressure, the load will bear a large launch load, which can easily have an adverse effect on the electronic components of the load; and the large recoil also requires the launch device to be designed with a corresponding recoil support device, which is not conducive to the miniaturization design of the ejection device and limits the application scenarios of the ejection method. Summary of the Invention

[0004] In view of this, the present invention provides an ejection device with adjustable expansion chamber volume, which can dynamically adjust the expansion chamber volume according to the expansion chamber pressure during the ejection process, reduce overload on the load, avoid adverse effects on the electronic components of the load, and at the same time reduce the recoil force generated by ejection, thereby achieving miniaturization of the ejection device.

[0005] This invention is achieved through the following technical solution:

[0006] An adjustable expansion chamber ejection device includes: a base support, a launch tube, and an ejection controller. The launch tube is mounted on the base support, and the length direction of the launch tube forms an acute angle with the ground.

[0007] The launch tube consists of an expansion chamber and a launcher; the expansion chamber is located at the rear of the launch tube, and the launcher is located at the head of the launch tube; the expansion chamber is closed at one end and open at the other end, and the launcher is open at both ends. The open end of the expansion chamber is coaxially connected to the launcher, and the combat load limiter is located inside the launcher.

[0008] The expansion chamber is equipped with spring A, a movable base plate, and a limiting device; the two sides of the movable base plate are surface A and surface B, one end of spring A is connected to the inner bottom surface of the closed end of the expansion chamber, and the other end is connected to surface A of the movable base plate; the limiting device is used to limit the movement of the movable base plate towards the opening end of the expansion chamber.

[0009] When the load is not being launched, spring A is in a compressed state under the action of the limiting device, and a cavity is formed between the B surface of the movable base plate and the bottom surface of the combat load.

[0010] During ejection, the ejection controller controls the ejection power source to generate a working medium. The working medium is released into the cavity, generating pressure, which drives the combat payload to move along the direction of the launch tube towards the head of the launch tube, thus achieving the ejection of the combat payload.

[0011] Furthermore, a damping buffer is also installed inside the expansion chamber. The damping buffer is located inside spring A, with one end connected to the inner bottom surface of the closed end of the expansion chamber and the other end connected to surface A of the movable base plate.

[0012] Furthermore, the damping parameters of the damping buffer are adjustable; a pressure sensor and a communication interface are provided on the side wall of the expansion chamber. The pressure sensor is electrically connected to the catapult controller, one end of the communication interface is electrically connected to the damping buffer, and the other end is electrically connected to the catapult controller.

[0013] The pressure sensor measures the pressure data in the expansion chamber in real time and transmits it to the ejection controller. The ejection controller adjusts the damping parameters of the damping buffer based on the pressure data.

[0014] Furthermore, the limiting device uses a retaining ring, which is set between the movable base plate and the opening end of the expansion chamber.

[0015] Furthermore, the base support includes a base, a connecting base, an angle adjustment bracket, and a positioning bracket;

[0016] The connecting base is located at one end of the base and is pinned to the tail of the launch tube; the angle adjustment bracket and positioning bracket are located at the other end of the base and are used to adjust the angle of the launch tube.

[0017] Furthermore, the positioning frame is a rectangular frame structure, with legs extending through all four side plates. The legs are telescopic structures, including an outer cylinder and an inner telescopic body. The outer cylinder is open at one end and closed at the other, with the open end of the outer cylinder fixedly connected to the outer side of the side plate. The inner telescopic body is located inside the outer cylinder and can extend and retract along the axial direction of the outer cylinder. It can extend beyond the open end of the outer cylinder and the side plate, and is located inside the positioning frame. A roller is provided at the end of the telescopic body that extends beyond the side plate. A spring B is provided inside the outer cylinder, with one end of the spring B abutting against the closed end of the outer cylinder and the other end abutting against the end of the inner telescopic body.

[0018] Furthermore, the angle adjustment bracket includes a bottom mounting plate, two positioning plates, two support plates, and a fixing plate;

[0019] The bottom mounting plate is fixedly mounted on the base. Two positioning plates are fixed side by side on the bottom mounting plate, both of which are inclined towards the connection base. Two support plates are fixed between the positioning plates and the bottom mounting plate to support the inclined positioning plates. A fixing plate is detachably connected between the two positioning plates to fix the positioning plates.

[0020] Each positioning plate has several positioning holes along its length on its side, and the positioning holes on the two positioning plates are aligned one to one.

[0021] The launch tube is installed inside the positioning frame, and the roller abuts against the launch tube under the action of spring B. The roller can roll along the axial direction of the launch tube.

[0022] The two opposing legs can be engaged and locked with the corresponding positioning holes on the two positioning plates. By adjusting the positioning holes of the legs and the positioning frame, the height of the positioning frame relative to the ground can be adjusted, thereby adjusting the angle between the launch tube and the ground.

[0023] Furthermore, the outer circumferential surface of the roller is a concave arc surface, conforming to the outer wall surface of the launch tube.

[0024] Furthermore, a force sensor is installed between the tail of the launch tube and the connecting base.

[0025] Beneficial effects:

[0026] (1) In this invention, the expansion chamber and the directional device are coaxially connected. The combat load limiter is set inside the directional device. One end of the spring A is connected to the inner bottom surface of the closed end of the expansion chamber, and the other end is connected to the A surface of the movable base plate. The limiting device limits the movement of the movable base plate towards the opening end of the expansion chamber. When the load is not launched, the spring A is in a compressed state under the action of the limiting device, and a cavity is formed between the B surface of the movable base plate and the bottom surface of the combat load. After the working medium is released in the cavity to generate pressure, the movable base plate can passively move axially according to its own force under the action of the spring, so that the pressure of the cavity in the expansion chamber can be passively and dynamically adjusted based on the preset pressure until the load is ejected from the tube, so as to ensure that the pressure in the expansion chamber is relatively stable, reduce the overload on the load, and avoid excessive pressure from adversely affecting the electronic components of the load. At the same time, it can also reduce the recoil generated by the ejection and realize the miniaturization of the ejection device.

[0027] (2) The present invention provides a damping buffer inside the spring A. One end of the damping buffer is connected to the inner bottom surface of the closed end of the expansion chamber, and the other end is connected to the A surface of the movable base plate. When the movable base plate moves, the damping buffer can generate damping force, which can play a role in vibration reduction, ensuring the stable movement of the movable base plate in the expansion chamber and extending the service life of the device.

[0028] (3) The damping parameters of the damping buffer of the present invention are adjustable. A pressure sensor and a communication interface are provided on the side wall of the expansion chamber. The pressure sensor measures the pressure data in the expansion chamber in real time and transmits it to the ejection controller. The ejection controller adjusts the damping parameters of the damping buffer according to the pressure data. Therefore, by setting a damping buffer with adjustable parameters, the damping parameters can be actively adjusted according to the real-time pressure in the expansion chamber, thereby actively adjusting the movement path of the movable base plate in real time and changing the volume in the expansion chamber.

[0029] (4) The present invention is provided with a positioning frame, and the four side plates of the positioning frame are provided with legs through them. The legs are telescopic structures. The open end of the outer cylinder is fixedly connected to the outside of the side plate. The telescopic body is provided with rollers after passing through the side plate. A spring B is provided inside the outer cylinder. One end of the spring B abuts against the closed end of the outer cylinder, and the other end abuts against the end of the inner telescopic body. The positioning frame is set as a telescopic structure, which facilitates the installation and movement of the positioning frame.

[0030] (5) The present invention is provided with an angle adjustment bracket, which has a number of one-to-one positioning holes. By adjusting the positioning holes that cooperate with the support legs and the positioning bracket, the height of the positioning bracket relative to the ground can be adjusted, thereby adjusting the angle between the launch tube and the ground to meet the needs of different launch angles.

[0031] (6) The outer circumference of the roller of the present invention is a concave arc surface that conforms to the outer wall surface of the launching tube. On the one hand, when adjusting the angle of the launching tube, the roller can roll in the axial direction of the launching tube to meet the smooth adjustment of the launching tube angle; on the other hand, the roller abuts against the outer wall surface of the launching tube under the action of the spring, which can radially position the launching tube.

[0032] (7) A force sensor is provided between the tail of the launch tube and the connecting base of the present invention to obtain recoil force data during the ejection process and monitor the status of the device. Attached Figure Description

[0033] Figure 1 This is a three-dimensional schematic diagram of the ejection device of the present invention;

[0034] Figure 2 This is a schematic diagram of the base frame of the present invention;

[0035] Figure 3 This is a schematic diagram of the launching tube of the present invention;

[0036] Figure 4 This is a schematic diagram of the expansion chamber of the present invention;

[0037] Figure 5 This is a schematic diagram of the angle adjustment bracket;

[0038] Figure 6 This is a schematic diagram of the positioning frame;

[0039] Figure 7 This is a side view of the ejection device of the present invention;

[0040] Figure 8 This is a schematic diagram showing the contact between the roller and the launch tube;

[0041] Figure 9 This is a front view of the catapult device of the present invention;

[0042] The components are as follows: 1-Base bracket, 2-Launch tube, 3-Connecting base, 4-Angle adjustment bracket, 5-Positioning frame, 6-Base, 7-Expansion chamber, 8-Director, 9-Spring A, 10-Damping buffer, 11-Modible base plate, 12-Retaining ring, 13-Force sensor, 14-Pressure sensor, 15-Communication interface, 16-Cable I, 17-Cable II, 18-Ejection controller, 41-Positioning plate, 42-Support plate, 43-Fixing plate, 45-Positioning hole, 46-Bottom mounting plate, 51-Outer cylinder, 52-Inner telescopic body, 53-Roller, 54-End cap. Detailed Implementation

[0043] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] Example 1:

[0045] This embodiment provides an ejection device with an adjustable expansion chamber volume, see attached document. Figure 1 It includes: a base support 1, a launch tube 2 and a catapult controller 18. The launch tube 2 is mounted on the base support 1, and the length direction of the launch tube 2 forms an acute angle with the ground.

[0046] See appendix Figure 2 The launch tube 2 consists of an expansion chamber 7 and a direction finder 8. The expansion chamber 7 is located at the tail of the launch tube 2, and the direction finder 8 is located at the head of the launch tube 2. The expansion chamber 7 is closed at one end and open at the other end, and the direction finder 8 is open at both ends. The open end of the expansion chamber 7 is coaxially connected to the direction finder 8, and the combat load limiter is set inside the direction finder 8.

[0047] See appendix Figure 3 The expansion chamber 7 is equipped with a spring A9, a movable base plate 11, and a limiting device. The two sides of the movable base plate 11 are surface A and surface B, respectively. One end of the spring A9 is connected to the inner bottom surface of the closed end of the expansion chamber 7, and the other end is connected to surface A of the movable base plate 11. The limiting device is used to limit the movement of the movable base plate 11 toward the open end of the expansion chamber 7. When the load is not launched, the spring A9 is in a compressed state under the action of the limiting device, and a cavity is formed between surface B of the movable base plate 11 and the bottom surface of the combat load. During ejection, the ejection controller 18 is used to control the ejection power source to generate a working medium. The working medium is released into the cavity, generating pressure and driving the combat load to move along the direction of the directional device toward the head of the launch tube 2, thereby realizing the ejection of the combat load.

[0048] In a specific embodiment, the limiting device is a retaining ring 12, which is set between the movable base plate 11 and the opening end of the expansion chamber 7.

[0049] See appendix Figure 4 The base bracket 1 includes a base 6, a connecting base 3, an angle adjustment bracket 4, and a positioning bracket 5;

[0050] The connecting base 3 is located at one end of the base 6 and is pinned to the tail of the launching tube 2; the angle adjustment bracket 4 and the positioning bracket 5 are located at the other end of the base 6 and are used to adjust the angle of the launching tube 2.

[0051] See appendix Figure 5 The angle adjustment bracket 4 includes a bottom mounting plate 46, two positioning plates 41, two support plates 42 and a fixing plate 43;

[0052] The bottom mounting plate 46 is fixedly mounted on the base 6. Two positioning plates 41 are fixed side by side on the bottom mounting plate 46 and are both inclined towards the connecting base 3. Two support plates 42 are fixed between the positioning plates 41 and the bottom mounting plate 46 to support the inclined positioning plates 41. The fixing plate 43 is detachably connected between the two positioning plates 41 to fix the positioning plates 41.

[0053] Each positioning plate 41 has several positioning holes 45 along its length on its side, and the positioning holes 45 on the two positioning plates 41 are opposite each other.

[0054] See appendix Figure 6 and 7 The positioning frame 5 is a rectangular frame structure. Each of the four side plates of the rectangular frame structure is equipped with a support leg, which is a telescopic structure, including an outer cylinder 51 and an inner telescopic body 52. ​​The outer cylinder 51 is open at one end and closed at the other, with the open end of the outer cylinder 51 fixedly connected to the outer side of the side plate. The inner telescopic body 52 is located inside the outer cylinder 51 and can extend and retract axially along the outer cylinder 51. It can extend beyond the open end of the outer cylinder 51 and the side plate, and is located inside the positioning frame 5. A roller 53 is provided at the end of the telescopic body extending beyond the side plate. (See attached diagram.) Figure 8 The outer circumferential surface of the roller 53 is a concave arc surface, conforming to the outer wall surface of the launching tube 2; a spring B (not shown in the figure) is provided inside the outer tube 51, one end of the spring B abuts against the closed end of the outer tube 51, and the other end abuts against the end of the inner telescopic body 52; the launching tube 2 is set through the inner side of the positioning frame 5, and the roller 53 abuts against the launching tube 2 under the action of the spring B, thereby radially positioning the launching tube 2; in a specific embodiment, the closed end of the outer tube 51 is formed by: the end cap 54 is set on the end of the outer tube 51 that is not fixed to the side plate by bolts, thereby closing this end of the outer tube 51 to form a closed end.

[0055] Two opposing legs can engage and lock with the opposing positioning holes 45 on the two positioning plates 41. By adjusting the positioning holes 45 that engage with the legs and the positioning frame 5, the height of the positioning frame 5 relative to the ground can be adjusted, thereby adjusting the angle between the launch tube 2 and the ground. The rollers 53 of the positioning frame 5 can roll along the axial direction of the launch tube 2 to adapt to the adjustment of the angle of the launch tube 2.

[0056] Working principle:

[0057] Before the ejection process begins, the movable base plate 11 abuts against the retaining ring 12 under the action of the spring A9, and the spring A9 is in a compressed state. At this time, the movable base plate 11 is in the initial position.

[0058] When the ejection controller 18 receives the working command, it controls the ejection power source (not shown in the figure) to start working, releasing the working medium into the cavity between the movable bottom plate in the expansion chamber and the combat load, and the pressure in the cavity begins to rise.

[0059] Before the load is ejected, when the pressure inside the cavity exceeds the preset pressure, the movable base plate 11 is compressed by the pressure inside the cavity and moves towards the tail of the launch tube 2. The volume of the cavity inside the expansion chamber 7 increases accordingly, and the pressure and load overload inside the cavity decrease accordingly. When the pressure inside the cavity decreases to the point that the pressure acting on the movable base plate 11 is less than the elastic force of the spring A9, the movable base plate 11 will decelerate towards the tail of the launch tube 2. When the speed of the movable base plate 11 decreases to 0, the movable base plate 11 will move towards the head under the elastic force of the spring A9, and under the limit of the limiting device, it will move as far as the initial position.

[0060] The movable base plate 11, within the expansion chamber 7, passively moves axially according to its own forces, thereby passively and dynamically adjusting the pressure within the cavity of the expansion chamber 7 based on a preset pressure, until the combat load is ejected from the tube. This ensures relatively stable pressure within the expansion chamber 7, reduces overload on the load, and avoids adverse effects of excessive pressure on the load's electronic components; it also reduces the recoil generated by ejection, enabling miniaturization of the ejection device.

[0061] Example 2:

[0062] This embodiment is based on embodiment 1 and provides an ejection device with an adjustable expansion chamber volume. A damping buffer 10 is also provided in the expansion chamber 7. The damping buffer 10 is located inside the spring A9, with one end connected to the inner bottom surface of the closed end of the expansion chamber 7 and the other end connected to the A surface of the movable base plate 11.

[0063] A damping buffer 10 is installed inside the spring A9. When the movable base plate 11 moves, the damping buffer 10 can generate a damping force, which can play a role in vibration reduction, ensuring the stable movement of the movable base plate 11 in the expansion chamber 7 and extending the service life of the device.

[0064] Example 3:

[0065] Based on Example 2, the damping parameters of the damping buffer 10 are adjustable; a pressure sensor 14 and a communication interface 15 are provided on the side wall of the expansion chamber 7. The pressure sensor 14 is connected to the ejection controller 18 through cable I 16, and one end of the communication interface 15 is electrically connected to the damping buffer 10, and the other end is electrically connected to the ejection controller 18 through cable II 17.

[0066] The pressure sensor 14 measures the pressure data in the expansion chamber 7 in real time and transmits it to the ejection controller 18. The ejection controller 18 adjusts the damping parameters of the damping buffer 10 according to the pressure data.

[0067] Working principle:

[0068] Before the load is ejected, when the pressure in the cavity of the expansion chamber 7 exceeds the preset pressure, the movable base plate 11 compresses the spring A9 and moves towards the tail of the launch tube 2 under the action of the pressure, and the volume of the cavity in the expansion chamber increases accordingly, and the pressure and load overload in the expansion chamber 7 decrease accordingly; at the same time, the damping force generated by the damping buffer 10 is related to the movement speed of the movable base plate 11, so the movement of the movable base plate 11 generates a damping force.

[0069] When the pressure in the expansion chamber 7 decreases to the point that the pressure acting on the movable base plate 11 is less than the elastic force of the spring A9 and the damping force generated by the damping buffer 10, the movable base plate 11 will decelerate towards the tail of the launch tube 2.

[0070] When the speed of the movable base plate 11 decreases to 0, the damping force is 0. The movable base plate 11 will move back to the initial position under the action of the elastic force of the spring A9, and the damping force will be generated again.

[0071] Therefore, by setting the adjustable damping buffer 10, the damping parameters can be actively adjusted according to the real-time pressure in the expansion chamber 7, thereby actively adjusting the movement path of the movable base plate and changing the volume in the expansion chamber 7.

[0072] Example 4:

[0073] This embodiment, based on Embodiments 1 and 2, provides an ejection device with an adjustable expansion chamber volume. (See attached diagram.) Figure 9 A force sensor 13 is installed between the tail of the launch tube 2 and the connecting base 3 to obtain recoil data during the ejection process and monitor the status of the device.

[0074] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A catapult device with an adjustable expansion chamber volume, characterized in that, include: The system includes a base support, a launch tube, and a catapult controller. The launch tube is mounted on the base support, and its length is at an acute angle to the ground. The launch tube consists of an expansion chamber and a launcher; the expansion chamber is located at the rear of the launch tube, and the launcher is located at the head of the launch tube; the expansion chamber is closed at one end and open at the other end, and the launcher is open at both ends. The open end of the expansion chamber is coaxially connected to the launcher, and the combat load limiter is located inside the launcher. The expansion chamber is equipped with spring A, a movable base plate, and a limiting device; the two sides of the movable base plate are surface A and surface B, one end of spring A is connected to the inner bottom surface of the closed end of the expansion chamber, and the other end is connected to surface A of the movable base plate; the limiting device is used to limit the movement of the movable base plate towards the opening end of the expansion chamber. When the load is not being launched, spring A is in a compressed state under the action of the limiting device, and a cavity is formed between the B surface of the movable base plate and the bottom surface of the combat load. During ejection, the ejection controller controls the ejection power source to generate a working medium. The working medium is released into the cavity, generating pressure, which drives the combat payload to move along the direction of the launch tube towards the head of the launch tube, thus achieving the ejection of the combat payload. After the working medium is released into the cavity to generate pressure, the movable base plate can passively move axially under the action of the spring according to its own force, so that the pressure in the cavity of the expansion chamber can be passively and dynamically adjusted based on the preset pressure, until the load is ejected from the cylinder, so as to ensure that the pressure in the expansion chamber is relatively stable.

2. The ejection device with adjustable expansion chamber volume as described in claim 1, characterized in that, The expansion chamber is also equipped with a damping buffer, which is located inside spring A. One end of the damping buffer is connected to the inner bottom surface of the closed end of the expansion chamber, and the other end is connected to surface A of the movable base plate.

3. The ejection device with adjustable expansion chamber volume as described in claim 2, characterized in that, The damping parameters of the damping buffer are adjustable; a pressure sensor and a communication interface are installed on the side wall of the expansion chamber. The pressure sensor is electrically connected to the catapult controller, and one end of the communication interface is electrically connected to the damping buffer and the other end is electrically connected to the catapult controller. The pressure sensor measures the pressure data in the expansion chamber in real time and transmits it to the ejection controller. The ejection controller adjusts the damping parameters of the damping buffer based on the pressure data.

4. The ejection device with adjustable expansion chamber volume as described in any one of claims 1-3, characterized in that, The limiting device uses a retaining ring, which is set between the movable base plate and the opening end of the expansion chamber.

5. The ejection device with adjustable expansion chamber volume as described in any one of claims 1-3, characterized in that, The base support includes a base, a connecting base, an angle adjustment bracket, and a positioning bracket; The connecting base is located at one end of the base and is pinned to the tail of the launch tube; the angle adjustment bracket and positioning bracket are located at the other end of the base and are used to adjust the angle of the launch tube.

6. The ejection device with adjustable expansion chamber volume as described in claim 5, characterized in that, The positioning frame is a rectangular frame structure. Each of the four side plates of the rectangular frame structure is provided with a support leg. The support leg is a telescopic structure, including an outer cylinder and an inner telescopic body. One end of the outer cylinder is open and the other end is closed. The open end of the outer cylinder is fixedly connected to the outside of the side plate. The inner telescopic body is set inside the outer cylinder and can extend and retract along the axial direction of the outer cylinder. It can extend out of the open end of the outer cylinder and the side plate and is located inside the positioning frame. The end of the telescopic body that extends out of the side plate is provided with a roller. A spring B is provided inside the outer cylinder. One end of the spring B abuts against the closed end of the outer cylinder, and the other end abuts against the end of the inner telescopic body.

7. The ejection device with adjustable expansion chamber volume as described in claim 6, characterized in that, The angle adjustment bracket includes a bottom mounting plate, two positioning plates, two support plates, and a fixing plate; The bottom mounting plate is fixedly mounted on the base. Two positioning plates are fixed side by side on the bottom mounting plate, both of which are inclined towards the connection base. Two support plates are fixed between the positioning plates and the bottom mounting plate to support the inclined positioning plates. A fixing plate is detachably connected between the two positioning plates to fix the positioning plates. Each positioning plate has several positioning holes along its length on its side, and the positioning holes on the two positioning plates are aligned one to one. The launch tube is installed inside the positioning frame, and the roller abuts against the launch tube under the action of spring B. The roller can roll along the axial direction of the launch tube. The two opposing legs can be engaged and locked with the corresponding positioning holes on the two positioning plates. By adjusting the positioning holes of the legs and the positioning frame, the height of the positioning frame relative to the ground can be adjusted, thereby adjusting the angle between the launch tube and the ground.

8. The ejection device with adjustable expansion chamber volume as described in claim 7, characterized in that, The outer circumferential surface of the roller is a concave arc surface, conforming to the outer wall surface of the launch tube.

9. The ejection device with adjustable expansion chamber volume as described in any one of claims 1-3, characterized in that, A force sensor is installed between the tail of the launch tube and the connecting base.

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