CN111928105A

CN111928105A - Composite material high-pressure gas cylinder fixing device special for aerospace carrier

Info

Publication number: CN111928105A
Application number: CN202011069144.4A
Authority: CN
Inventors: 铁文军; 李秀明; 张峥智; 赵志浩; 曹文斌; 杜正刚
Original assignee: Landspace Technology Co Ltd
Current assignee: Landspace Technology Co Ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2020-11-13
Anticipated expiration: 2040-10-09
Also published as: CN111928105B

Abstract

The invention provides a composite material high-pressure gas cylinder fixing device special for a space carrier. The device is used for fixing a high-pressure gas cylinder, and the high-pressure gas cylinder is provided with a front end clamping part and a rear end clamping part which are respectively provided with an inner concave plane. The device at least comprises: front end support, rear end support and rear end support, front end support and front end support are with the centre gripping of high-pressure gas cylinder front end clamping part, and the first fastening structure of rethread makes the high-pressure gas cylinder front end be fixed in the front end support, and the rear end support is with the centre gripping of high-pressure gas cylinder rear end clamping part with the rear end support to make the rear end of high-pressure gas cylinder be fixed in the rear end support through second fastening structure. According to the high-pressure gas cylinder fixing device provided by the invention, the front-end clamping part and the rear-end clamping part of the high-pressure gas cylinder are respectively clamped and fixed in a matching manner, and the radial rotation of the high-pressure gas cylinder is limited, so that the high-pressure gas cylinder is more reliably fixed, and the reliability of the high-pressure gas cylinder fixing device is improved.

Description

Composite material high-pressure gas cylinder fixing device special for aerospace carrier

Technical Field

The invention relates to the technical field of high-pressure gas cylinder fixing equipment, in particular to a composite material high-pressure gas cylinder fixing device special for a space carrier.

Background

The high-pressure gas cylinder special for the spacecraft is a pressure container used for storing high-pressure gas (such as oxygen, nitrogen, hydrogen, helium and the like), and has higher requirements on space environment adaptability, dimensional stability, rapid assembly and connection and the like of materials. Most of the traditional high-pressure gas cylinders are made of metal materials, and the passive mass of the structure is large. At present, high-pressure gas cylinders are prepared from advanced composite materials, and the composite materials become the preferred high-pressure-resistant bearing gas cylinder materials due to the excellent properties of light weight, high structural efficiency, good fatigue resistance, good damage safety and the like.

The support and fastening of the composite material high-pressure gas cylinder special for the spacecraft in the vibration environment are always difficult points for using the high-pressure gas cylinder. Because the composite material high-pressure gas cylinder can generate larger deformation in the process of charging and discharging, and a pipeline connected with the gas cylinder can be broken in a vibration environment, so that high-pressure gas in the gas cylinder is leaked.

The composite material gas cylinder fixing device for the existing space carrier is mostly fixed on a support through a wrapping tape or a hoop, or the degree of freedom of the gas cylinder is limited by using a very complicated fixing device, the deformation of the gas cylinder cannot be well compensated through the two schemes, and multi-degree-of-freedom positioning cannot be realized. The severe deformation of the gas cylinder can cause damage to the gas cylinder or a gas cylinder fixing device, or increase the additional load on a gas cylinder outlet conduit, and even cause the condition of pipeline fracture. Therefore, the problem to be solved at present is to provide a high-pressure gas cylinder fixing device which has the advantages of considering both gas cylinder deformation compensation and gas cylinder freedom degree constraint, optimizing installation layout and having stable and reliable functions.

Disclosure of Invention

Aiming at the technical problems in the related art, the invention provides the composite material high-pressure gas cylinder fixing device special for the spaceflight carrier, and the device has the advantages of restraining the freedom degree of the high-pressure gas cylinder, being stable in structure, safe and reliable, compensating the deformation of the composite material high-pressure gas cylinder and the like. The problem of high pressure gas cylinder fixing device can't compensate the radial and axial deformation of combined material gas cylinder well is solved, high pressure gas cylinder fixing device's stability has been improved simultaneously.

The invention provides a composite material high-pressure gas cylinder fixing device special for an aerospace carrier, which is used for fixing a high-pressure gas cylinder. This high-pressure gas cylinder fixing device includes: the front end support, can dismantle set up in front end support, the rear end support of front end support, can dismantle set up in the rear end support of rear end support, and set up in the front end support with the first fastening structure of front end leg joint position with set up in the rear end support with the second fastening structure of rear end leg joint position. The front end support is provided with a first lower groove matched with the front end clamping part of the high-pressure gas cylinder, the front end support is provided with a first upper groove matched with the front end clamping part of the high-pressure gas cylinder, the front end clamping part of the high-pressure gas cylinder is clamped through the first lower groove and the first upper groove and is fixed through the first fastening structure, the rear end support is provided with a second lower groove matched with the rear end clamping part of the high-pressure gas cylinder, the rear end support is provided with a second upper groove matched with the rear end clamping part of the high-pressure gas cylinder, the rear end clamping part of the high-pressure gas cylinder is clamped through the second lower groove and the second upper groove and is fixed through the second fastening structure, and the high-pressure gas cylinder is stably fixed between the front end support and the rear end support.

In one embodiment, two mutually opposite first raised planes are arranged on the inner side wall of the first lower groove, and the same first raised plane is arranged on the first upper groove at the position corresponding to the first lower groove; the first protruding plane is matched with and clamped with the concave plane of the clamping part at the front end of the high-pressure gas cylinder, so that the radial rotation of the high-pressure gas cylinder is limited, and the high-pressure gas cylinder is stably supported and fixed.

In one embodiment, the first convex plane is seamlessly arranged in the concave plane of the clamping part at the front end of the high-pressure gas cylinder so as to limit the movement and radial rotation of the front end part of the high-pressure gas cylinder in the axial direction of the front end part of the high-pressure gas cylinder and ensure the stable support of the high-pressure gas cylinder.

In one embodiment, the inner side wall of the second lower groove is provided with two mutually opposite second raised planes, and the second upper groove is provided with the same second raised planes at the positions corresponding to the second lower groove; the second raised plane is matched with and clamped tightly with the concave plane of the clamping part at the rear end of the high-pressure gas cylinder, so that the radial rotation limitation of the high-pressure gas cylinder is enhanced, and the support stability of the high-pressure gas cylinder is improved.

In one embodiment, in the axial direction of the high-pressure gas cylinder, the second convex plane is arranged in the concave plane of the rear-end clamping part of the high-pressure gas cylinder with a gap, and the second concave plane and the second convex plane form a sliding structure so as to meet the axial deformation of the high-pressure gas cylinder.

In one embodiment, the gap distance between the second convex plane and the clamping part at the rear end of the high-pressure gas cylinder is 2-4 mm, so as to fully meet the axial deformation of the high-pressure gas cylinder.

In one embodiment, the first fastening structure comprises a front fastening screw and a first threaded through hole and a first threaded counter bore matched with the front fastening screw; the first thread through hole is formed in the front end support, the first thread counter bore is formed in the front end support, the front end fastening screw is matched with the first thread through hole and the first thread counter bore, the high-pressure gas cylinder front end clamping portion is fixed between the front end support and the front end support, and the front end of the high-pressure gas cylinder is supported by the front end support.

In one embodiment, two first threaded through holes are arranged on two sides of the first upper groove of the front end support, and two first threaded counter bores are correspondingly arranged on two sides of the first lower groove of the front end support, so that the front end clamping part of the high-pressure gas cylinder can be effectively fixed.

In one embodiment, the second fastening structure comprises a rear fastening screw and a second threaded through hole and a second threaded counter bore matched with the rear fastening screw; the second thread through hole is formed in the rear end support, the second thread counter bore is formed in the rear end support, the rear end fastening screw is matched with the second thread through hole and the second thread counter bore, the high-pressure gas cylinder rear end clamping part is fixed between the rear end support and the rear end support, and the front end support supports the rear end of the high-pressure gas cylinder.

In one embodiment, two second threaded through holes are arranged on two sides of the second upper groove of the rear end support, and two second threaded counter bores are correspondingly arranged on two sides of the second lower groove of the rear end support, so that the rear end clamping part of the high-pressure gas cylinder can be effectively fixed.

The composite material high-pressure gas cylinder fixing device special for the spaceflight carrier, provided by the invention, not only can compensate the deformation of the composite material high-pressure gas cylinder, but also can restrain the degree of freedom of the high-pressure gas cylinder, and the problem that the existing fixing device cannot give consideration to both the deformation compensation of the gas cylinder and the degree of freedom restraint of the gas cylinder is solved. The device has the advantages of ingenious structure, reliable connection, easy installation and disassembly, strong maintainability and stability, lighter weight than the prior fixing device, and capability of meeting the weight reduction requirement of the spacecraft.

Those skilled in the art will recognize additional features and advantages upon reading the detailed description, and upon viewing the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a composite material high-pressure gas cylinder fixing device special for an aerospace vehicle according to an embodiment of the invention.

Fig. 2 is a schematic structural diagram of a front end support and a front end bracket according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a rear end support and a rear end bracket according to an embodiment of the invention.

Fig. 4 is a schematic structural view of a high-pressure gas cylinder according to an embodiment of the present invention.

Fig. 5 is a schematic cross-sectional structure diagram of a composite material high-pressure gas cylinder fixing device special for an aerospace vehicle according to an embodiment of the invention.

Fig. 6 is a cross-sectional view at the position B-B' in fig. 5.

Fig. 7 is a cross-sectional view taken at the position a-a' in fig. 5.

FIG. 8 is a schematic diagram of the gap between the second convex plane and the concave plane of the rear clamping portion of the high pressure gas cylinder according to the embodiment of the present invention.

Fig. 9 is a schematic view showing the displacement of the rear end holding portion when the high pressure gas cylinder is expanded during inflation.

Fig. 10, 11 and 12 are structural schematic views of a fastening screw, a threaded through hole and a threaded counter bore, respectively, of a first fastening structure.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. Spatially relative terms such as "below," "… below," "lower," "above," "… above," "upper," and the like are used for convenience in describing the positioning of one element relative to a second element and are intended to encompass different orientations of the device in addition to different orientations than those illustrated in the figures. Further, for example, the phrase "one element is over/under another element" may mean that the two elements are in direct contact, or that there is another element between the two elements. Furthermore, terms such as "first", "second", and the like, are also used to describe various elements, regions, sections, etc. and should not be taken as limiting. Like terms refer to like elements throughout the description.

The invention provides a composite material high-pressure gas cylinder fixing device special for a space carrier. Referring to fig. 1, the apparatus is used for fixing a high pressure gas cylinder 1000, wherein the high pressure gas cylinder 1000 has a front end clamping portion 1001 and a rear end clamping portion 1002 provided with concave planes, respectively. The device at least comprises: front end support 1, can dismantle the front end support 2 that sets up in front end support 1, rear end support 3, can dismantle the rear end support 4 that sets up in rear end support 3 to and set up in the first fastening structure 5 of front end support 1 and front end support 2 hookup location and set up in the second fastening structure 6 of rear end support 3 and rear end support 4 hookup location.

Referring to fig. 1, 2 and 3, the front end support 1 has a base for contacting to the ground and a supporting end for matching with the front clamping portion of the high pressure gas cylinder, the supporting end of the front end support 1 is provided with a first lower groove 11 matching with the front clamping portion 1001 of the high pressure gas cylinder, and the front end support 2 detachably disposed with the front support 1 is provided with a first upper groove 21 matching with the front clamping portion 1001 of the high pressure gas cylinder. The high-pressure cylinder front-end clamping portion 1001 may be clamped between the first lower groove 11 and the first upper groove 21, and the high-pressure cylinder is fixed to the front end mount 1 by the first fastening structure 5.

Similarly, the rear end support 3 also has a base for contacting the ground and a support end for matching with the rear end clamping portion of the high-pressure gas cylinder, the support end of the rear end support 3 is provided with a second lower groove 31 matched with the rear end clamping portion 1002 of the high-pressure gas cylinder, the rear end support 4 is provided with a second upper groove 41 matched with the rear end clamping portion 1002 of the high-pressure gas cylinder, the rear end clamping portion 1002 of the high-pressure gas cylinder is clamped by the second lower groove 31 and the second upper groove 41 and is fixed by the second fastening structure 6, so that the rear end clamping portion 1002 of the high-pressure gas cylinder is fixed on the rear end support 3. The front end and the rear end of the high-pressure gas cylinder are effectively fixed respectively, so that the high-pressure gas cylinder can be stably fixed between the front end support 1 and the rear end support 3.

According to the high-pressure gas cylinder fixing device provided by the invention, the front end clamping part and the rear end clamping part of the high-pressure gas cylinder are assembled in place through the front end support and the support, and are fixed through the first fastening structure and the second fastening structure respectively. On the one hand, can make the high pressure gas cylinder obtain more reliable fixed, restrict the radial rotation of high pressure gas cylinder, on the other hand, this kind of front and back end separately carries out the device that supports work, and maintainability is high, makes things convenient for spare part replacement, can promote the work efficiency and the operational reliability of high pressure gas cylinder fixed work.

Referring to fig. 4, 5 and 6 together, fig. 6 is a sectional view at the position B-B' in fig. 5. In one embodiment, the first lower groove 11 opens upward for holding and carrying the front end 1001 of the high pressure gas cylinder provided with the concave plane a1, and the first upper groove 21 opens downward for cooperating with the first lower groove 11 for holding the front end of the high pressure gas cylinder provided with the concave plane a 1. Specifically, two mutually opposite first protrusion planes T1 are provided on the inner side wall of the first lower groove 11, and the same protrusion plane T1 is provided at the position corresponding to the first lower groove 11 on the first upper groove 21, wherein the protrusion plane T1 matches with the concave plane a1 provided at the front end of the high pressure gas cylinder, and the protrusion plane T1 and the concave plane a1 of the front end clamping part 1001 of the high pressure gas cylinder are matched to make the planes interfere with each other. Compared with an arc surface, the plane cannot rotate radially, so that the radial rotation of the high-pressure gas cylinder can be better limited, and the high-pressure gas cylinder can be stably supported and fixed. After the front end support is assembled on the front end support and fixes the front end part of the high-pressure gas cylinder through the first fastening structure, the front end support and the two first raised planes which are close to the front end support up and down can form a new plane, and the new plane is matched and matched with the concave plane on one side of the front end part of the high-pressure gas cylinder.

Or, in an embodiment, the first upper groove and the first lower groove may be respectively provided with one first convex plane, and correspondingly, only one concave plane may be provided at the front end of the high-pressure gas cylinder. After the front end support is assembled on the front end support and fixes the front end part of the high-pressure gas cylinder through the first fastening structure, the two first raised planes which are vertically close to the front end support and the front end support can form a new plane and are matched with the concave plane of the front end part of the high-pressure gas cylinder, and the high-pressure gas cylinder can be reliably fixed.

In the above embodiment, the first protruding plane is seamlessly disposed in the concave plane of the clamping portion at the front end of the high-pressure gas cylinder, so that the first protruding plane can be freely assembled and disassembled, and the movement in other directions can be limited, and the first protruding plane and the concave plane of the clamping portion at the front end of the high-pressure gas cylinder are in a mutually abutting state to limit the movement and radial rotation of the front end of the high-pressure gas cylinder in the axial direction, thereby realizing the stable support and fixation of the front end of the high-pressure gas cylinder.

Further, the parts of the high-pressure gas cylinder fixing device are industrially produced, and the assembly of the parts is not up to standard due to production errors, particularly the parts matched with each other and having the limiting function. For example, in the production process, the caliber of the concave plane may become larger, so that a gap exists between the first convex plane and the concave plane, and the first convex plane is prone to shake. In order to eliminate the influence, a proper amount of non-woven fabric can be placed in the gap position and then fastened through the first locking structure, so that the adverse influence caused by production errors is eliminated.

Referring to fig. 4, 5 and 7 together, fig. 7 is a sectional view at the position B-B' in fig. 5. In one embodiment, the second lower groove 31 opens upwardly for securing and carrying the rear end of the high pressure gas cylinder having the inner concave surface a2, and the second upper groove 41 opens downwardly for cooperating with the second lower groove 31 for securing the rear end of the high pressure gas cylinder having the inner concave surface a 2. Specifically, the side inner wall of second lower recess 31 sets up two mutually opposite second raised plane T2, and second upper groove 41 sets up the same second raised plane T2 in the position that corresponds with second lower recess 31, matches through the concave plane a2 of second raised plane T2 with the high-pressure gas cylinder rear end clamping part, makes conflict each other between plane and the plane, and then can further strengthen the radial rotation restriction to the high-pressure gas cylinder, promotes the support stability of high-pressure gas cylinder.

Alternatively, in one embodiment, the second upper groove and the second lower groove may be respectively provided with a second convex plane, and correspondingly, only one concave plane may be provided at the rear end of the high-pressure gas cylinder. After the rear end support is assembled on the rear end support and the rear end part of the high-pressure gas cylinder is fixed through the second fastening structure, the rear end support and two second raised planes which are close to the rear end support up and down can form a new plane and are matched with the concave plane of the rear end part of the high-pressure gas cylinder, and the high-pressure gas cylinder can be reliably fixed.

Referring to fig. 8 and 9, in an embodiment, in an axial direction of the high-pressure gas cylinder, a gap between the second convex plane and the concave plane of the 1002 is set to be L, so that the second concave plane and the second convex plane form a sliding structure to satisfy axial sliding of axial deformation of the high-pressure gas cylinder caused by inflation and expansion during inflation, and a state in fig. 8 is a changing state of the high-pressure gas cylinder during axial deformation of inflation and deflation. Specifically, when the sizes of the concave planes of the front and rear clamping parts of the high-pressure gas cylinder are consistent, the size of the second convex plane can be set to be smaller than that of the first convex plane, and then the front end of the high-pressure gas cylinder is fixed and the rear end of the high-pressure gas cylinder can slide.

According to the high-pressure gas cylinder provided by the embodiment of the invention, the front end of the high-pressure gas cylinder is limited and fixed, and the rear end of the high-pressure gas cylinder is axially fixed in a sliding manner, so that the rear-end clamping part can axially slide along the rear-end support to adapt to expansion and contraction in the inflation and expansion process of the high-pressure gas cylinder, the radial limitation of the high-pressure gas cylinder can be met, and the axial deformation of the high-pressure gas cylinder can be adapted. Because the high-pressure gas cylinder body part has no fixed point, the radial deformation of the cylinder body has no influence on the front and rear end support structures.

Further, in this embodiment, the clearance distance L of the second projection plane from the high-pressure cylinder rear end clamp portion is set to 2 to 4 mm. Generally, after the gas cylinder is inflated, the length of the cylinder body is increased by 2-3 mm, so that the gap distance can be set to be 4 mm or 3 mm, and the sliding requirement of the gas cylinder after inflation and deflation and the axial deformation of the high-pressure gas cylinder are fully met.

Referring to fig. 10, 11 and 12, in one embodiment, the first fastening structure includes a front fastening screw 51, and a first threaded through hole 52 and a first threaded counter bore 53 matched with the front fastening screw 51, the first threaded through hole 52 is disposed at a position where the front bracket 2 is butted to the front bracket 1, the first threaded counter bore 52 is disposed at the front bracket 1 corresponding to the first threaded through hole 51, the front fastening screw 51 is engaged with the first threaded through hole 52 and the first threaded counter bore 53 to fix the high-pressure gas cylinder front clamping portion 1001 between the front bracket 2 and the front bracket 1, and support the front end of the high-pressure gas cylinder through the front bracket. According to the embodiment of the invention, the front end of the high-pressure gas cylinder is fixed in a threaded manner, so that the assembly and disassembly are convenient and easy to operate, and the assembly and disassembly time is saved.

Specifically, the first thread through holes are two and are respectively arranged on two sides of a first upper groove of the front end support, the two first thread through holes correspond to the center of the first upper groove, correspondingly, two first thread counter bores are correspondingly arranged on two sides of a first lower groove of the front end support, and two corresponding pairs of screw holes are respectively fastened through two front end fastening screws so as to effectively fix the front end clamping part of the high-pressure gas cylinder.

Or only one first thread through hole is arranged on one side of the first upper groove of the front end support, correspondingly, a first thread counter bore is arranged at the position, corresponding to the first upper groove of the front end support, of the first lower groove of the front end support, the front end fastening screw is matched with the first thread through hole and the first thread counter bore to complete the fixed connection of the one side, and the other side fixedly connects the front end support with the front end support through the rotating shaft structure. Can realize when loading and unloading at every turn, only need the dismouting the front end fastening screw of certain side can, make first upper groove and first recess part down through the pivot structure, the front end support is in the same place with front end leg joint moreover, and storage and use are all more convenient.

In one embodiment, the second fastening structure comprises a rear-end fastening screw and a second threaded through hole and a second threaded counter bore which are matched with the rear-end fastening screw, the second threaded through hole is arranged at the position where the rear-end support is correspondingly connected with the rear-end support, the second threaded counter bore is arranged at the rear-end support correspondingly to the second threaded through hole, the rear-end fastening screw is matched with the second threaded through hole and the second threaded counter bore to fix the rear-end clamping part of the high-pressure gas cylinder between the rear-end support and the rear-end support, and the rear end of the high-pressure gas cylinder is supported by the front-end support. According to the embodiment of the invention, the rear end of the high-pressure gas cylinder is fixed in a threaded manner, so that the assembly and disassembly are convenient, and the operation is simple.

Specifically, two second threaded through holes may be provided on both sides of a second upper groove of the rear end bracket, and the two first threaded through holes correspond to each other with the first upper groove as a center. Correspondingly, two second threaded counter bores are correspondingly arranged on two sides of a second lower groove of the rear end support, and two corresponding pairs of screw holes are fastened through two rear end fastening screws respectively so as to effectively fix the rear end clamping part of the high-pressure gas cylinder.

Or, for the convenience of assembling and disassembling, the rear end bracket can be connected with one side of the rear end support through a rotating shaft structure, and the other side of the rear end support is in threaded connection.

In the above embodiments, in order to simplify the work production and assembly process, the specification dimensions of the respective components of the second fastening structure and the first fastening structure may be set to be the same.

In the above embodiment, the front end support and the rear end support are respectively provided with the ground contacting end, the middle part of the ground contacting end is respectively provided with the inner groove, and the high-pressure gas cylinder fixing device is assembled inside the aerospace vehicle through the inner groove in a clamping manner so as to fix and limit the high-pressure gas cylinder fixing device. The sunken degree of inner groovy can set up according to the inside assembly environment of space carrier, under certain specific environment, when the gas cylinder takes place the expansion deformation, the inner groovy can take place the axial slip in that the rocket body is inside to adapt to high pressure gas cylinder's deformation.

In the above embodiment, the front end support and the front end support may be provided with an anti-slip layer at a position for abutting against the front end clamping portion of the high pressure gas cylinder, and the rear end support may be provided with an anti-slip layer at a position for abutting against the rear end clamping portion of the high pressure gas cylinder, so as to limit the radial rotation of the high pressure gas cylinder.

The above embodiments may be combined with each other with corresponding technical effects.

The composite material high-pressure gas cylinder fixing device special for the spaceflight carrier, provided by the invention, not only can compensate the deformation of the composite material high-pressure gas cylinder, but also can restrain the degree of freedom of the high-pressure gas cylinder, and the problem that the existing fixing device can not take account of both the gas cylinder deformation compensation and the gas cylinder degree of freedom restraint is solved. The device has the advantages of ingenious structure, reliable connection, easy installation and disassembly, strong maintainability and stability, capability of well limiting the degree of freedom of the gas cylinder, light weight compared with the prior fixing device and capability of meeting the weight reduction requirement of a spacecraft.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a combined material high pressure gas cylinder fixing device who is exclusively used in space carrier for fixed high pressure gas cylinder, high pressure gas cylinder has the front end clamping part and the rear end clamping part that set up the indent plane respectively, a serial communication port, include: the device comprises a front end support, a rear end support, a first fastening structure and a second fastening structure, wherein the front end support is detachably arranged on the front end support;

the front end support is provided with a first lower groove matched with the clamping part at the front end of the high-pressure gas cylinder, the front end support is provided with a first upper groove matched with the clamping part at the front end of the high-pressure gas cylinder, the clamping part at the front end of the high-pressure gas cylinder is clamped by the first lower groove and the first upper groove, and the clamping part is fixed by the first fastening structure; the rear end support is provided with a second lower groove matched with the rear end clamping part of the high-pressure gas cylinder, the rear end support is provided with a second upper groove matched with the rear end clamping part of the high-pressure gas cylinder, and the rear end clamping part of the high-pressure gas cylinder is clamped by the second lower groove and the second upper groove and is fixed by the second fastening structure.

2. The composite material high-pressure gas cylinder fixing device according to claim 1, wherein two first protruding planes opposite to each other are provided on the inner wall of the side surface of the first lower groove, and the same first protruding plane is provided on the first upper groove at a position corresponding to the first lower groove; the first protruding plane is matched and clamped with the concave plane of the clamping part at the front end of the high-pressure gas cylinder, so that the radial rotation of the high-pressure gas cylinder is limited.

3. The composite high pressure gas cylinder fixture according to claim 2, wherein the first raised plane is seamlessly provided in the concave plane of the high pressure gas cylinder front end clamp to limit the movement and radial rotation of the high pressure gas cylinder front end in its axial direction.

4. The composite high-pressure gas cylinder fixing device according to claim 1, wherein two second convex planes are provided opposite to each other on the inner side wall of the second lower groove, and the same second convex plane is provided on the second upper groove at a position corresponding to the second lower groove; the second convex plane is matched and clamped with the concave plane of the clamping part at the rear end of the high-pressure gas cylinder, so that the radial rotation limitation of the high-pressure gas cylinder is enhanced.

5. The composite material high-pressure gas cylinder fixing device according to claim 4, wherein in the axial direction of the high-pressure gas cylinder, the second convex plane is arranged in the concave plane of the clamping part at the rear end of the high-pressure gas cylinder at a gap, so that the second concave plane and the second convex plane form a sliding structure to meet the axial deformation of the high-pressure gas cylinder.

6. The composite high-pressure gas cylinder fixing device according to claim 5, wherein the clearance distance between the second projection plane and the rear end clamping portion of the high-pressure gas cylinder is 2 to 4 mm.

7. The composite high-pressure gas cylinder fixing device according to claim 1, wherein the first fastening structure comprises a front-end fastening screw and a first threaded through hole and a first threaded counter bore which are matched with the front-end fastening screw; the first threaded through hole is formed in the front end support, the first threaded counter bore is formed in the front end support, and the front end fastening screw is matched with the first threaded through hole and the first threaded counter bore to fix the front end clamping part of the high-pressure gas cylinder between the front end support and the front end support.

8. The composite material high-pressure gas cylinder fixing device according to claim 7, wherein two first threaded through holes are formed in two sides of the first upper groove of the front end support, and two first threaded counter bores are correspondingly formed in two sides of the first lower groove of the front end support, so that the front end clamping portion of the high-pressure gas cylinder can be effectively fixed.

9. The composite high-pressure gas cylinder fixing device according to any one of claims 1 to 7, wherein the second fastening structure comprises a rear-end fastening screw and a second threaded through hole and a second threaded counter bore which are matched with the rear-end fastening screw; the second threaded through hole is formed in the rear end support, the second threaded counter bore is formed in the rear end support, and the rear end fastening screw is matched with the second threaded through hole and the second threaded counter bore to fix the rear end clamping part of the high-pressure gas cylinder between the rear end support and the rear end support.

10. The composite material high pressure gas cylinder fixing device according to claim 9, wherein two second threaded through holes are provided on both sides of the second upper groove of the rear end bracket, and two second threaded counter bores are correspondingly provided on both sides of the second lower groove of the rear end support, so as to achieve effective fixing of the rear end clamping portion of the high pressure gas cylinder.