A connection structure of a cylinder

Abstract

The present application discloses a connection structure of a cylinder, the connection structure comprising a first connection piece, a sealing sleeve and a second connection piece; the first connection piece comprises a main body part and a stud part; the present application designs a normal through hole and an axial through hole in the thickened area of ​​the cylinder, adopts the first connection piece to be connected in the normal through hole, the second connection piece passes through the structure to be connected and the axial through hole in the thickened area, and is threadedly connected to the first connection piece to achieve quadrant positioning, and finally, the connection combination of the stud part and the sealing sleeve can meet the requirements of bearing and sealing; the connection structure of the present application has a simple installation method, effectively avoids bonding defects, has good sealing performance, can give full play to the high-strength characteristics of the fiber layer of the composite material, and has the advantages of high connection strength and controllable quality.

Description

Technical Field

[0001] The present application relates to the field of aerospace equipment manufacturing, and in particular to a connection structure of a cylinder. Background Art

[0002] The fiber-reinforced composite cylinder has the characteristics of high specific strength, high specific modulus, anisotropy, etc. Compared with metal materials, it has better advantages in the preparation and molding of lightweight components. However, the interlaminar mechanical properties of fiber-reinforced materials are weaker than the performance within the fiber plane, which affects the connection performance of the composite material. For example, it is easier to produce defects such as delamination, cracking, and fiber debonding, which affects the performance of the composite material.

[0003] Among them, the connection strength of the composite material barrel is an important factor in ensuring that the ejection device can resist external forces. In addition, requirements are also put forward for the sealing of the connection structure to ensure that there is no leakage when subjected to gas thrust, maintain the stability of the internal ballistic performance, and ensure the speed and safety of the objects in the barrel out of the barrel.

[0004] In the prior art (such as Figure 1 As shown), in order to ensure the connection between the composite material cylinder and the primary volume chamber, the base and other structures, the existing method is to use a metal flange, set the connecting screw holes on the metal flange, and the metal flange and the cylinder are combined into one by secondary bonding.

[0005] The solutions in the prior art have the following problems: although the methods in the prior art meet the strength of threaded connections, they increase the requirements for metal flange production and control of bonding with the cylinder, which increases the cost. In addition, due to the mismatch of the bonding interface structure and the thermal stress of the glue layer, the bonding integrity cannot be fully guaranteed during the bonding process, resulting in low bonding strength and leakage risks. Utility Model Content

[0006] The embodiment of the present application provides a connection structure of a cylinder, which has good stability and sealing performance.

[0007] The embodiment of the present application discloses a connection structure of a cylinder, including a first connecting piece, a sealing sleeve and a second connecting piece; a thickened area is provided on the outer circumference of the cylinder, and a plurality of normal through holes and axial through holes are provided on the thickened area along the circumference of the cylinder, and the normal through holes are connected with the axial through holes in a one-to-one correspondence; the first connecting piece includes a main body part and a stud part, both of which are arranged in the normal through hole, and a connecting hole is provided on the main body part, and the stud part is located at an end of the main body part away from the axis of the cylinder; at least part of the sealing sleeve is arranged in the normal through hole, and the sealing sleeve is provided with a groove, and the groove is threadedly connected to the stud part; the second connecting piece passes through the external structure to be connected and the axial through hole in sequence, and at least part of the second connecting piece is threadedly connected to the connecting hole.

[0008] The connection structure of the cylinder of the present application has at least the following beneficial effects:

[0009] The connection structure of the present application includes a first connection piece, a sealing sleeve and a second connection piece; the first connection piece includes a main body portion and a stud portion; the present application designs a normal through hole and an axial through hole in the thickened area of ​​the cylinder, and adopts a first connection piece to be connected in the normal through hole, and the second connection piece passes through the structure to be connected and the axial through hole in the thickened area, and is threadedly connected to the first connection piece to achieve quadrant positioning, and finally, the connection combination of the stud portion and the sealing sleeve can meet the requirements of load bearing and sealing; the connection structure of the present application is simple in installation method, effectively avoids bonding defects, has good sealing performance, can give full play to the high-strength characteristics of the fiber layer of the composite material, and has the advantages of high connection strength and controllable quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0011] Figure 1 It is a schematic diagram of a cylinder in the prior art;

[0012] Figure 2 is a schematic diagram of a connection structure in some embodiments of the present application;

[0013] Figure 3 yes Figure 2 A partial cross-sectional schematic diagram of;

[0014] Figure 4 is a schematic diagram of a radial cross section of a connection structure in some embodiments of the present application;

[0015] Figure 5 yes Figure 4 The enlarged view of point A in the middle;

[0016] Figure 6 is an exploded schematic diagram of a sealing sleeve, a first sealing member, and a first connecting member in some embodiments of the present application;

[0017] Figure 7 yes Figure 2 Another partial cross-sectional schematic diagram of ;

[0018] Figure 8 is a schematic structural diagram of a first connecting member in some embodiments of the present application;

[0019] Fig. 9 is a cross-sectional schematic diagram of a first connecting member in some other embodiments of the present application;

[0020] Description of the reference numerals is as follows:

[0021] 1. Cylinder; 11. Thickened area; 12. Normal through hole; 121. First hole section; 122. Second hole section; 123. Third hole section; 13. Axial through hole; 14. Second sealing groove; 14a. Second sealing member;

[0022] 2. First connecting member; 21. Main body; 211. Connecting hole; 211a. Main connecting section; 211b. Horn section; 22. Stud section; 23. Head;

[0023] 3. Sealing sleeve; 31. Groove; 32. First sealing groove; 32a. First sealing member;

[0024] 4. A second connecting member;

[0025] 5. Structure to be connected. DETAILED DESCRIPTION

[0026] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0028] In order to facilitate understanding of the technical solutions of the embodiments of the present application, the current situation in the industry is first described.

[0029] See also Figure 1 , Figure 1 It is a solution in the prior art. Figure 1 The reference numeral 1-1 in the figure indicates a cylinder in the prior art; 2-1 indicates a metal flange; 3-1 indicates a bonding layer; Figure 1 There are some problems with the existing solutions, which have been explained in the background technology and will not be repeated here.

[0030] In order to solve the above problems, the present application discloses a connection structure of the cylinder, such as Figure 2 and Figure 3 As shown, the connection structure includes a first connection member 2, a sealing sleeve 3 and a second connection member 4;

[0031] The outer circumference of the cylinder 1 is provided with a thickened area 11, and the thickened area 11 is provided with a plurality of normal through holes 12 and axial through holes 13 along the circumference of the cylinder 1, and the normal through holes 12 are connected with the axial through holes 13 in a one-to-one correspondence;

[0032] The first connecting member 2 includes a body portion 21 and a stud portion 22 both disposed in the normal through hole 12. The body portion 21 is provided with a connecting hole 211. The stud portion 22 is located at an end of the body portion 21 away from the axis of the cylinder 1.

[0033] At least part of the sealing sleeve 3 is disposed in the normal through hole 12, and the sealing sleeve 3 is provided with a groove 31, and the groove 31 is threadedly connected with the stud portion 22;

[0034] The second connecting member 4 passes through the external structure to be connected 5 and the axial through hole 13 in sequence, and at least a portion of the second connecting member 4 is threadedly connected to the connecting hole 211 .

[0035] Among them, the cylinder 1 described in the embodiment of the present application is a structure made of fiber-reinforced composite material, and its shape is a circular cylinder; a thickened area 11 is provided at one axial end of the cylinder 1, and the thickened area 11 is arranged around the circumference of the cylinder 1, and the radial thickness (or normal thickness) of the thickened area 11 is more than one tenth of the radius of the cylinder.

[0036] Among them, the thickened area 11 is provided with a normal through hole 12 that penetrates the thickened area 11 along the normal direction of the cylinder 1, and multiple normal through holes 12 are equidistantly arranged along the circumference of the cylinder 1; the thickened area 11 is also provided with an axial through hole 13, and the axial through hole 13 is opened along the axial direction of the cylinder 1, and one end of the axial through hole 13 is connected to the normal through hole 12, and the other end of the axial through hole 13 penetrates to the right side surface of the thickened area 11.

[0037] Among them, the first connecting member 2 includes a main body portion 21 and a stud portion 22, both of which are arranged in the normal through hole 12, and the stud portion 22 is located on the side away from the axis of the cylinder. The groove 31 on the sealing sleeve 3 is provided with an internal thread, and the groove 31 is threadedly connected to the stud portion 22, which can achieve sealing of one end of the normal through hole 12.

[0038] The second connecting member 4 axially penetrates the external structure to be connected 5 and passes through the axial through hole 13 on the thickened area 11, and at least part of the second connecting member 4 is also threadedly connected to the connecting hole 211 on the main body 21. Here, the left end face of the structure to be connected 5 is attached to the right end face of the thickened area 11.

[0039] The connection structure of the embodiment of the present application includes a first connection member 2, a sealing sleeve 3 and a second connection member 4; the first connection member 2 includes a main body portion 21 and a stud portion 22; the embodiment of the present application is designed with a normal through hole 12 and an axial through hole 13 in the thickened area 11 of the cylinder 1, and the first connection member 2 is connected in the normal through hole 12, the second connection member 4 passes through the structure to be connected 5 and the axial through hole 13 of the thickened area 11, and is threadedly connected to the first connection member 2 to achieve quadrant positioning, and finally, the connection combination of the stud portion 22 and the sealing sleeve 3 can meet the requirements of bearing and sealing; the connection structure of the embodiment of the present application is simple in installation method, effectively avoids bonding defects, has good sealing performance, can give full play to the high-strength characteristics of the fiber layer of the composite material, and has the advantages of high connection strength and controllable quality.

[0040] Preferably, Figure 4 and Figure 5 As shown, the normal through hole 12 includes a first hole segment 121, a second hole segment 122 and a third hole segment 123 that are connected to each other; the first connecting member 2 includes a head 23, a body 21 and a stud portion 22 that are connected in sequence, the head 23 is arranged in the first hole segment 121, the body 21 is arranged in the second hole segment 122, and the stud portion 22 is arranged in the third hole segment 123; wherein, at least part of the sealing sleeve 3 is arranged in the third hole segment 123.

[0041] The first hole segment 121 , the second hole segment 122 and the third hole segment 123 are sequentially connected along the normal direction of the cylinder 1 .

[0042] The head portion 23 , the body portion 21 , and the stud portion 22 are sequentially connected along the normal direction of the cylinder 1 , or the head portion 23 , the body portion 21 , and the stud portion 22 are integrally formed.

[0043] The head portion 23 is disposed in the first hole section 121 , the body portion 21 is disposed in the second hole section 122 , and the stud portion 22 extends into the third hole section 123 in a direction away from the body portion 21 .

[0044] Among them, the outer shape of the sealing sleeve 3 is consistent with the inner circumferential shape of the third hole section 123, and the sealing sleeve 3 is provided with an inwardly concave groove 31 along its axial direction. The inner wall of the groove 31 is provided with an internal thread matching the stud part 22. The sealing sleeve 3 is arranged in the third hole section 123, and the groove 31 on the sealing sleeve 3 is threadedly connected to the stud part 22.

[0045] In the embodiment of the present application, the first connecting member 2 can be installed by designing a normal through hole 12 that matches the first connecting member 2, and the force and load-bearing performance can be optimized while meeting the sealing requirements.

[0046] Preferably, Figure 5 As shown, the inner circumference of the first hole segment 121 is conical, the inner circumferences of the second hole segment 122 and the third hole segment 123 are both cylindrical, and the inner diameter of the second hole segment 122 is smaller than the inner diameter of the third hole segment 123 .

[0047] Among them, the first hole section 121 is a conical countersunk hole, while the second hole section 122 and the third hole section 123 are both cylindrical holes. Because the inner diameter of the second hole section 122 is smaller than the inner diameter of the third hole section 123, a step surface (i.e., the inner bottom surface of the third hole section 123) is formed between the second hole section 122 and the third hole section 123.

[0048] In the embodiment of the present application, the normal through hole 12 has various hole sections with different inner diameters, which can facilitate the installation of various parts of the first connecting member 2, and the step surface formed between the second hole section 122 and the third hole section 123 can facilitate the installation of the sealing sleeve 3 and the subsequent sealing process between the sealing sleeve 3 and the step surface.

[0049] Preferably, Figure 5 As shown, the outer circumference of the head portion 23 fits with the inner circumference of the first hole segment 121 , the outer circumference of the body portion 21 fits with the inner circumference of the second hole segment 122 , and the outer circumference of the sealing sleeve 3 fits with the inner circumference of the third hole segment 123 .

[0050] The head portion 23 is conical in shape, the outer diameter of the body portion 21 is equal to the inner diameter of the second hole section 122 , and the outer diameter of the sealing sleeve 3 is equal to the inner diameter of the third hole section 123 .

[0051] In the embodiment of the present application, by designing various parts of the first connecting member 2 to fit on the inner circumference of each hole segment of the normal through hole 12, the sealing performance at this position can be improved, thereby improving the overall performance of the product.

[0052] Preferably, Figure 6 As shown, a first groove (not marked) is provided on a side of the head portion 23 away from the main body portion 21 ; a second groove (not marked) is provided on a side of the sealing sleeve 3 away from the main body portion 21 .

[0053] Among them, Figure 6 As shown, a first groove (e.g., a cross groove) is provided on the back side of the head 23, and the first groove facilitates the staff to operate the first connecting member 2, and facilitates the screwing in or screwing out action. Similarly, a second groove (e.g., a straight groove) is provided on the back end face of the sealing sleeve 3, and the second groove facilitates the staff to thread the sealing sleeve 3 onto the stud portion 22 of the first connecting member 2.

[0054] In the embodiment of the present application, the first groove and the second groove are provided to facilitate the workers to install the connection structure, thereby improving work efficiency.

[0055] Preferably, Figure 6 As shown, the sealing sleeve 3 is provided with a first sealing groove 32 , at least a portion of the first sealing member 32 a is disposed in the first sealing groove 32 and the first sealing member 32 a abuts against the inner bottom surface of the third hole section 123 .

[0056] Among them, Figure 6 As shown, the overall shape of the sealing sleeve 3 is cylindrical, and a groove 31 is provided on an axial end face of the sealing sleeve 3 facing the stud part 22, and the groove 31 can be threadedly connected to the stud part 22, and a first sealing groove 32 is provided on the axial end face.

[0057] Among them, at least part of the first seal 32a is installed in the first sealing groove 32. As the groove 31 and the stud portion 22 are screwed in, the first seal 32a is crimped between the sealing sleeve 3 and the inner bottom surface of the third hole section 123, thereby achieving sealing at this position.

[0058] In the embodiment of the present application, by setting the first sealing groove 32, the sealing between the sealing sleeve 3 and the normal through hole 12 can be achieved, thereby improving the sealing performance at the position of the normal through hole 12. At the same time, since the sealing sleeve 3 and the stud part 22 are threaded, the first sealing member 32a can achieve deformation sealing under the action of the threaded cooperation, and the sealing effect is good.

[0059] Preferably, Figure 7 As shown, the axial end face of the thickened area 11 is provided with a second sealing groove 14, the second sealing groove 14 is arranged around the axial through hole 13, at least part of the second sealing member 14a is arranged in the second sealing groove 14, and the second sealing member 14a is against the side of the structure 5 to be connected.

[0060] Among them, Figure 7 As shown, the axial end face of the thickened area 11 refers to an end face facing the structure to be connected 5, and a plurality of second sealing grooves 14 are arranged on the axial end face of the thickened area 11, and the second sealing grooves 14 are arranged one-to-one with the axial through holes 13 on the thickened area 11. Preferably, the second sealing grooves 14 and the axial through holes 13 are arranged coaxially and correspondingly.

[0061] Among them, Figure 7 As shown, at least part of the second seal 14a is installed in the second sealing groove 14. When the second connecting member 4 locks the structure 5 to be connected on the axial end face of the thickened area 11, the second seal 14a is crimped between the axial end face of the thickened area 11 and the side face of the structure 5 to be connected.

[0062] In the embodiment of the present application, the axial through hole 13 can be sealed by designing the second sealing groove 14 and the second sealing member 14a. At the same time, by utilizing the threaded cooperation between the second connecting member 4 and the first connecting member 2 (specifically the main body 21), the second sealing member 14a can be squeezed and deformed to achieve deformation sealing.

[0063] Preferably, Figure 6 As shown, the first sealing member 32a or the second sealing member 14a is configured as an O-ring.

[0064] The first sealing member 32a and the second sealing member 14a are both O-rings, and the O-rings are made of a deformable material, such as silicone, epoxy, sponge, rubber, etc.

[0065] In the embodiment of the present application, both the first sealing member 32a and the second sealing member 14a are O-rings, and the components are easy to obtain, which can reduce the burden on manufacturing.

[0066] Preferably, Figure 8 As shown, the connection hole 211 on the main body 21 passes through the main body 21 ; the second connection member 4 passes through the connection hole 211 along the axial direction, and the second connection member 4 is threadedly connected to the main body 21 .

[0067] Among them, Figure 8 As shown, the connection hole 211 is provided through the axial direction of the cylinder 1 at the middle position of the main body 21 , and the inner circumference of the connection hole 211 is provided with an internal thread.

[0068] Among them, the outer circumference of the second connecting member 4 is provided with an external thread. In the specific manufacturing process, the second connecting member 4 can be a screw or other existing threaded connecting members.

[0069] Among them, the second connecting member 4 penetrates the external structure to be connected 5 along the axial direction of the cylinder 1, and one end of the second connecting member 4 extends into the axial through hole 13 on the thickened area 11, and is finally threadedly connected with the connecting hole 211 on the main body 21, so that the structure to be connected 5 is locked on the axial end face of the thickened area 11.

[0070] In the embodiment of the present application, the connecting hole 211 is designed to pass through the main body 21, which can increase the connection length between the main body 21 and the second connecting member 4, thereby increasing the stability of the structure. In addition, in the present application, through the combination of the first connecting member 2 and the second connecting member 4, quadrant positioning between the two can be achieved, which significantly improves the structural stability.

[0071] Preferably, Fig. 9 As shown, one end of the connection hole 211 facing the second connection member 4 is configured as a horn section 211 b to facilitate the introduction of the second connection member 4 into the connection hole 211 .

[0072] Among them, Fig. 9 As shown, the connecting hole 211 on the main body 21 includes a main connecting section 211a and a horn section 211b which are connected in sequence along the axial direction of the cylinder 1. The inner periphery of the main connecting section 211a is provided with an internal thread connected to the second connecting member 4, and the horn section 211b is located on the side of the connecting hole 211 facing the second connecting member 4.

[0073] Among them, Fig. 9 As shown, the outer diameter of the large port of the horn section 211b is larger than the inner diameter of the main connecting section 211a, and the axial length of the horn section 211b is less than one tenth of the axial length of the main connecting section 211a.

[0074] In the embodiment of the present application, the right side of the connecting hole 211 is designed as a horn section 211b. When the second connecting member 4 needs to extend into the main connecting section 211a, the horn section 211b can play a centering and guiding function, thereby guiding the second connecting member 4 into the main connecting section 211a, thereby reducing the installation inconvenience caused by processing errors.

[0075] The embodiment of the present application discloses a connection structure of a cylinder, such as Figures 2 to 9 As shown, the connection structure includes a first connection member 2, a sealing sleeve 3 and a second connection member 4; the first connection member 2 includes a head 23, a main body and a stud portion 22; the connection relationship and position relationship of the above components have been explained above and will not be repeated here. The following is an installation method of the connection structure of an embodiment of the present application.

[0076] The first connecting member 2 is installed into the normal through hole 12 of the cylinder 1, and the second connecting member 4 passes through the structure to be connected 5 and extends into the normal through hole 12 from the axial through hole 13 of the thickened area 11, and is threadedly connected with the first connecting member 2 in the normal through hole 12, thereby realizing the quadrant positioning between the first connecting member 2 and the second connecting member 4, and then the sealing sleeve 3 equipped with the first sealing member 32a is threadedly screwed with the stud portion 22 of the first connecting member 2, and the installation is completed.

[0077] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A connection structure of a cylinder, characterized in that: It comprises a first connecting piece (2), a sealing sleeve (3) and a second connecting piece (4); The outer circumference of the cylinder (1) is provided with a thickened area (11), and the thickened area (11) is provided with a plurality of normal through holes (12) and axial through holes (13) along the circumference of the cylinder (1), and the normal through holes (12) are connected to the axial through holes (13) in a one-to-one correspondence; The first connecting member (2) comprises a main body portion (21) and a stud portion (22) both of which are arranged in the normal through hole (12); the main body portion (21) is provided with a connecting hole (211); and the stud portion (22) is located at an end of the main body portion (21) away from the axis of the cylinder; At least a portion of the sealing sleeve (3) is disposed in the normal through hole (12), the sealing sleeve (3) is provided with a groove (31), and the groove (31) is threadedly connected to the stud portion (22); The second connecting member (4) passes through the external structure to be connected (5) and the axial through hole (13) in sequence, and at least part of the second connecting member (4) is threadedly connected to the connecting hole (211).

2. The connection structure of the cylinder according to claim 1, characterized in that: The normal through hole (12) comprises a first hole section (121), a second hole section (122) and a third hole section (123) which are connected to each other; the first connecting member (2) comprises a head section (23), a body section (21) and a stud section (22) which are connected in sequence, the head section (23) is arranged in the first hole section (121), the body section (21) is arranged in the second hole section (122), and the stud section (22) is arranged in the third hole section (123); wherein at least a part of the sealing sleeve (3) is arranged in the third hole section (123).

3. The connection structure of the cylinder according to claim 2, characterized in that: The inner circumference of the first hole section (121) is conical, the inner circumferences of the second hole section (122) and the third hole section (123) are both cylindrical, and the inner diameter of the second hole section (122) is smaller than the inner diameter of the third hole section (123).

4. The connection structure of the cylinder according to claim 3, characterized in that: The outer periphery of the head portion (23) fits with the inner periphery of the first hole segment (121), the outer periphery of the main body portion (21) fits with the inner periphery of the second hole segment (122), and the outer periphery of the sealing sleeve (3) fits with the inner periphery of the third hole segment (123).

5. The connection structure of the cylinder according to any one of claims 2 to 4, characterized in that: A first groove is provided on the side of the head (23) facing away from the main body (21); and a second groove is provided on the side of the sealing sleeve (3) facing away from the main body (21).

6. The connection structure of the cylinder according to any one of claims 2 to 4, characterized in that: The sealing sleeve (3) is provided with a first sealing groove (32), at least part of the first sealing member (32a) is arranged in the first sealing groove (32), and the first sealing member (32a) abuts against the inner bottom surface of the third hole section (123).

7. The connection structure of the cylinder according to claim 6, characterized in that: The axial end surface of the thickened area (11) is provided with a second sealing groove (14), the second sealing groove (14) is arranged around the axial through hole (13), at least part of the second sealing member (14a) is arranged in the second sealing groove (14), and the second sealing member (14a) is against the side surface of the structure to be connected (5).

8. The connection structure of the cylinder according to claim 7, characterized in that: The first sealing member (32a) or the second sealing member (14a) is configured as an O-ring.

9. The connection structure of the cylinder according to claim 1, characterized in that: The connecting hole (211) on the main body (21) passes through the main body (21); the second connecting piece (4) passes through the connecting hole (211) along the axial direction, and the second connecting piece (4) and the main body (21) are threadedly connected.

10. The connection structure of the cylinder according to claim 9, characterized in that: One end of the connection hole (211) facing the second connection member (4) is configured as a horn section (211b), so as to facilitate the introduction of the second connection member (4) into the connection hole (211).

Images