Cargo boom barrel and crane

Abstract

The utility model relates to the technical field of cargo booms, in particular to a cargo boom barrel and a crane, and the cargo boom barrel comprises a first half barrel, a second half barrel and a plug-in structure. Specifically, the first half cylinder body and the second half cylinder body are each of a thin-wall structure, the cross section of the first half cylinder body and the cross section of the second half cylinder body are each of an arch-shaped structure, notches are formed in the first half cylinder body and the second half cylinder body, and the notches of the first half cylinder body and the notches of the second half cylinder body are oppositely arranged and jointly spliced into the cargo boom cylinder body. The opposite insertion structure is arranged at the splicing position of the first half barrel and the second half barrel and suitable for enabling the notch of the first half barrel and the notch of the second half barrel to be oppositely inserted so as to adjust the relative position of the first half barrel and the second half barrel. According to the cargo boom barrel and the crane, the forming size of the cargo boom barrel can be guaranteed through fine adjustment of the size, so that the size of the manufactured cargo boom barrel is kept consistent.

Description

Technical Field

[0001] The utility model relates to the technical field of crane arms, in particular to a crane arm cylinder and a crane. Background Art

[0002] The boom cylinder is the main structural component and load-bearing part of the boom. To ensure safety, the boom cylinder has high requirements for structural strength. In related technologies, the boom cylinder is usually made of multiple wing panels, and adjacent wing panels are usually connected by direct butt welding.

[0003] However, the dimensions of the boom cylinder formed by such splicing are often difficult to guarantee due to welding errors or dimensional errors of the wing plates themselves, which results in differences in the dimensions of multiple boom cylinders of the same specification, seriously affecting the subsequent assembly. Utility Model Content

[0004] In view of this, the utility model provides a boom cylinder and a crane to solve the problem that it is difficult to ensure the molding size of the boom cylinder, thereby causing the sizes of multiple boom cylinders of the same specification to be inconsistent.

[0005] In the first aspect, the utility model provides a boom cylinder, comprising a first half cylinder, a second half cylinder and an interlocking structure, wherein the first half cylinder and the second half cylinder are spliced ​​together to form a boom cylinder, and the interlocking structure is arranged at the joint of the first half cylinder and the second half cylinder. Specifically, the first half cylinder and the second half cylinder are both thin-walled structures, and the cross-sections of the first half cylinder and the second half cylinder are arched structures and form notches, and the notches of the first half cylinder and the second half cylinder are arranged relative to each other to be spliced ​​together to form a boom cylinder. The interlocking structure is suitable for relatively inserting the notches of the first half cylinder and the second half cylinder to adjust the relative positions of the first half cylinder and the second half cylinder.

[0006] Beneficial effect: Under the action of the plug-in structure, the notches of the first half cylinder and the second half cylinder are inserted relative to each other, and by adjusting the relative insertion depth between the two, the relative position between the first half cylinder and the second half cylinder can be changed, thereby achieving fine-tuning of the size of the boom cylinder, facilitating precise control of the size of the boom cylinder, and ensuring the molding size of the boom cylinder, without being affected by the size errors of the first half cylinder and the second half cylinder themselves, nor by the production process. Therefore, the boom cylinder provided by this solution can accurately control the molding size of the boom cylinder, ensure the consistency of the size of the boom cylinder, and facilitate later assembly.

[0007] In an optional embodiment, the first semi-cylinder includes a first bottom plate and two first side plates, the first bottom plate is connected between the two first side plates, the two first side plates form a notch of the first semi-cylinder, and the ends of the two first side plates along the extension direction perpendicular to the boom cylinder form a first splicing end. The second semi-cylinder includes a second bottom plate and two second side plates, the second bottom plate is connected between the two second side plates, the two second side plates form a notch of the second semi-cylinder, and the ends of the two second side plates along the extension direction perpendicular to the boom cylinder form a second splicing end. Wherein, along the extension direction perpendicular to the boom cylinder, the first splicing end and the second splicing end are staggered to form a plug-in structure.

[0008] Beneficial effect: The structures of the first half cylinder and the second half cylinder together form a plug-in structure, which does not require additional components, has a simple structure, and is easy to produce.

[0009] In an optional embodiment, the first half cylinder is arranged above the second half cylinder, the first splicing end covers the outside of the second splicing end, and the first splicing end is welded to the second splicing end.

[0010] Beneficial effect: With such arrangement, since the first splicing end covers the outside of the second splicing end, the forming dimensions of the boom cylinder will not be affected during welding, the welding difficulty is reduced, and the welding accuracy is easier to control, thereby ensuring the structural strength of the boom cylinder and avoiding problems such as weld cracking.

[0011] In an optional embodiment, the first half cylinder is arranged above the second half cylinder, the second splicing end covers the outside of the first splicing end, and the first splicing end and the second splicing end are welded.

[0012] Beneficial effect: the second splicing end covers the outside of the first splicing end, and the forming size of the boom cylinder is not affected during welding. The welding difficulty is reduced and the welding accuracy is easier to control, thereby ensuring the structural strength of the boom cylinder and avoiding problems such as weld cracking.

[0013] In an optional embodiment, the first semi-cylinder includes a first bottom plate and two first side plates, the first bottom plate is connected between the two first side plates, the two first side plates form a notch of the first semi-cylinder, and the ends of the two first side plates along the extension direction perpendicular to the boom cylinder form a first splicing end. The second semi-cylinder includes a second bottom plate and two second side plates, the second bottom plate is connected between the two second side plates, the two second side plates form a notch of the second semi-cylinder, and the ends of the two second side plates along the extension direction perpendicular to the boom cylinder form a second splicing end. The plug-in structure includes two guide plates, the two guide plates are respectively connected between the first splicing ends of the two correspondingly arranged first side plates and the second splicing ends of the second side plates; along the extension direction perpendicular to the boom cylinder, the guide plates are staggered with the first splicing end and the second splicing end.

[0014] Beneficial effect: The guide plate is used to achieve the insertion of the first half cylinder and the second half cylinder, which can not only realize the size adjustment of the boom cylinder and ensure the forming size of the boom cylinder, but also increase the upper limit of the relative position of the first half cylinder and the second half cylinder, thereby increasing the upper limit of the maximum size of the boom cylinder.

[0015] In an optional embodiment, the guide plate is welded to the same side of the first side plate and the second side plate.

[0016] Beneficial effect: the guide plate is welded to the same side of the first side plate and the second side plate, and the obtained boom cylinder has good mechanical properties and can meet the structural strength requirements of the boom cylinder, and the operation difficulty is low and the welding accuracy is easy to control.

[0017] In an optional embodiment, the two guide plates both cover the inner sides of the first side plate and the second side plate; or the two guide plates both cover the outer sides of the first side plate and the second side plate.

[0018] Beneficial effect: The guide plate covers the inner or outer side of the first side plate and the second side plate, which can not only realize the adjustable size of the boom cylinder, but also improve the structural strength of the joint between the first half cylinder and the second half cylinder, thereby ensuring the safety of the operation.

[0019] In an optional embodiment, the first bottom plate includes two connected first plate portions, and the angle between the two first plate portions is an obtuse angle.

[0020] Beneficial effect: Such an arrangement can increase the section modulus of the boom cylinder, thereby improving the lateral bending stiffness and torsional stiffness of the cross section of the boom cylinder.

[0021] In an optional embodiment, the second bottom plate includes five second plate portions connected in sequence, and the angle between two adjacent second plate portions is an obtuse angle.

[0022] Beneficial effect: The second bottom plate is configured as a plurality of second plate portions sequentially connected at obtuse angles, which can further increase the section modulus of the boom cylinder, so as to improve the lateral bending stiffness and torsional stiffness of the cross section of the boom cylinder.

[0023] In a second aspect, the utility model further provides a crane, comprising the boom cylinder as described above.

[0024] Beneficial effects: Since the crane of the utility model includes the above-mentioned boom cylinder, it has the same effects as the boom cylinder of the utility model, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a cross-sectional view of the boom cylinder of the first embodiment of the utility model;

[0027] Figure 2 It is a cross-sectional view of the boom cylinder of the second embodiment of the utility model;

[0028] Figure 3 It is a cross-sectional view of the boom cylinder of the third embodiment of the utility model;

[0029] Figure 4 This is a cross-sectional view of the boom cylinder in another state of the third embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 1. First half cylinder; 10. First joint end; 11. First bottom plate; 111. First plate portion; 12. First side plate; 2. Second half cylinder; 20. Second joint end; 21. Second bottom plate; 211. Second plate portion; 22. Second side plate; 3. Insertion structure; 30. Guide plate. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0033] Combine the following Figures 1 to 4 , describing an embodiment of the utility model.

[0034] On the one hand, the utility model provides a boom cylinder, comprising a first half cylinder 1, a second half cylinder 2 and an inserting structure 3. The first half cylinder 1 and the second half cylinder 2 are spliced ​​together to form the boom cylinder, and the inserting structure 3 is arranged at the splicing of the first half cylinder 1 and the second half cylinder 2.

[0035] Specifically, the first half cylinder 1 and the second half cylinder 2 are both thin-walled structures, and the cross-sections of the first half cylinder 1 and the second half cylinder 2 are arched structures and form notches, and the notches of the first half cylinder 1 and the second half cylinder 2 are arranged opposite to each other so as to be spliced ​​together to form the above-mentioned boom cylinder. The insertion structure 3 is suitable for inserting the notches of the first half cylinder 1 and the notches of the second half cylinder 2 relative to each other so as to adjust the relative positions of the first half cylinder 1 and the second half cylinder 2.

[0036] In this embodiment, under the action of the insertion structure 3, the notches of the first half cylinder 1 and the second half cylinder 2 are relatively inserted, and by adjusting the relative insertion depth between the two, the relative position between the first half cylinder 1 and the second half cylinder 2 can be changed, thereby achieving fine adjustment of the size of the boom cylinder, facilitating accurate control of the size of the boom cylinder, ensuring the molding size of the boom cylinder, and not being affected by the size error of the first half cylinder 1 and the second half cylinder 2, nor by the production process. Therefore, the boom cylinder provided by this embodiment can accurately control the molding size of the boom cylinder, ensuring the consistency of the size of the boom cylinder, so as to facilitate later assembly.

[0037] In the actual production process, a positioning fixture can also be used to position the first half cylinder 1 and the second half cylinder 2, so that the notches of the first half cylinder 1 and the second half cylinder 2 are relatively inserted to a predetermined depth, and the relative position between the two is controlled, thereby accurately obtaining a boom cylinder of the expected size.

[0038] It should be noted that after the notches of the first half cylinder 1 and the second half cylinder 2 are inserted relative to a predetermined depth, the insertion structure 3 directly or spacedly fixes the first half cylinder 1 and the second half cylinder 2 into an integral structure to meet the structural strength requirements of the boom cylinder.

[0039] Specifically, in some embodiments, see Figure 1 and Figure 2 The first half cylinder 1 includes a first bottom plate 11 and two first side plates 12. The first bottom plate 11 is connected between the two first side plates 12. The two first side plates 12 form a notch of the first half cylinder 1, and the ends of the two first side plates 12 along the extension direction perpendicular to the boom cylinder form a first splicing end 10.

[0040] Furthermore, the second half cylinder 2 includes a second bottom plate 21 and two second side plates 22, the second bottom plate 21 is connected between the two second side plates 22, the two second side plates 22 form a notch of the second half cylinder 2, and the ends of the two second side plates 22 along the extension direction perpendicular to the boom cylinder form a second splicing end 20.

[0041] Wherein, along the extension direction perpendicular to the boom cylinder, the first splicing end 10 and the second splicing end 20 are staggered to form a plug-in structure 3 .

[0042] In this embodiment, the structures of the first half cylinder 1 and the second half cylinder 2 together form the plug-in structure 3, which does not require additional components, has a simple structure, and is easy to produce.

[0043] It can be understood that, in this embodiment, the relative position of the first half cylinder 1 and the second half cylinder 2 is adjusted by adjusting the size of the mutual displacement of the first splicing end 10 and the second splicing end 20 .

[0044] Furthermore, the first side plate 12 and the second side plate 22 are arranged parallel to each other, so as to adjust the relative positions of the first half cylinder 1 and the second half cylinder 2.

[0045] Furthermore, the first splicing end 10 and the second splicing end 20 are connected to each other with the offset partial structures, so that the plug-in structure 3 directly connects the first half cylinder 1 and the second half cylinder 2 into an integral structure. Exemplarily, the first splicing end 10 and the second splicing end 20 can be connected by bolts, rivets or welding.

[0046] As preferred, in some embodiments, Figure 1 As shown, the first half cylinder 1 is arranged above the second half cylinder 2, the second splicing end 20 covers the outside of the first splicing end 10, and the first splicing end 10 and the second splicing end 20 are welded. Figure 2 As shown, the first splicing end 10 covers the outer side of the second splicing end 20 , and the first splicing end 10 and the second splicing end 20 are welded.

[0047] With such arrangement, since the first splicing end 10 and the second splicing end 20 overlap, the forming dimensions of the boom cylinder will not be affected during welding, the welding difficulty is reduced, and the welding accuracy is easier to control, thereby ensuring the structural strength of the boom cylinder and avoiding problems such as weld cracking.

[0048] Exemplarily, a double weld is used between the first splicing end 10 and the second splicing end 20 to further increase the strength of the weld, thereby improving the mechanical properties and safety of the boom cylinder.

[0049] It is understandable that if Figure 1 and Figure 2 As shown, the two first side panels 12 and the two second side panels 22 are in a one-to-one correspondence, and the welding of the first splicing end 10 and the second splicing end 20 refers to the welding between two corresponding sets of first side panels 12 and second side panels 22 respectively.

[0050] Specifically, in some other embodiments, see Figure 3 and Figure 4 The first half cylinder 1 includes a first bottom plate 11 and two first side plates 12. The first bottom plate 11 is connected between the two first side plates 12. The two first side plates 12 form a notch of the first half cylinder 1, and the ends of the two first side plates 12 along the extension direction perpendicular to the boom cylinder form a first splicing end 10.

[0051] Furthermore, the second half cylinder 2 includes a second bottom plate 21 and two second side plates 22, the second bottom plate 21 is connected between the two second side plates 22, the two second side plates 22 form a notch of the second half cylinder 2, and the ends of the two second side plates 22 along the extension direction perpendicular to the boom cylinder form a second splicing end 20.

[0052] Furthermore, the plug-in structure 3 includes two guide plates 30 , and the two guide plates 30 are respectively connected between the first splicing ends 10 of the first side plates 12 and the second splicing ends 20 of the second side plates 22 that are correspondingly arranged.

[0053] Wherein, along the extending direction perpendicular to the boom cylinder, the guide plate 30 and the first splicing end 10 and the second splicing end 20 are all staggered.

[0054] In this embodiment, the guide plate 30 is used to achieve the insertion of the first half cylinder 1 and the second half cylinder 2, which can not only realize the size adjustment of the boom cylinder and ensure the forming size of the boom cylinder, but also increase the upper limit of the relative position of the first half cylinder 1 and the second half cylinder 2, thereby increasing the upper limit of the maximum size of the boom cylinder.

[0055] It is understandable that, in this embodiment, the relative position of the first half cylinder 1 and the second half cylinder 2 is adjusted by adjusting the offset size between the guide plate 30 and the first splicing end 10, or between the guide plate 30 and the second splicing end 20.

[0056] Furthermore, the guide plate 30 and the first side plate 12 and the second side plate 22 are arranged parallel to each other to facilitate adjustment of the relative positions of the first half cylinder 1 and the second half cylinder 2. For example, the cross section of the guide plate 30 can be constructed as a "U" type or a "Z" type structure.

[0057] Further, the two guide plates 30 are respectively connected between the first splicing end 10 of the two correspondingly arranged first side plates 12 and the second splicing end 20 of the second side plates 22, so as to indirectly fix the first half cylinder 1 and the second half cylinder 2 into an integral structure. Exemplarily, the guide plate 30 and the first splicing end 10 or the guide plate 30 and the second splicing end 20 can be bolted, riveted or welded.

[0058] Preferably, in some embodiments, the guide plate 30 is welded to the same side of the first side plate 12 and the second side plate 22. The obtained boom cylinder has good mechanical properties and can meet the structural strength requirements of the boom cylinder. It also has low operating difficulty and is easy to control welding accuracy.

[0059] Exemplarily, double welds are used between the first splicing end 10 of the guide plate 30 and the first side plate 12, and between the second splicing end 20 of the guide plate 30 and the second side plate 22 to further improve the weld strength, thereby improving the mechanical properties and safety of the boom cylinder.

[0060] Furthermore, in some embodiments, the two guide plates 30 are both covered on the inner side of the first side plate 12 and the second side plate 22; or the two guide plates 30 are both covered on the outer side of the first side plate 12 and the second side plate 22. In this way, the guide plates 30 can not only realize the adjustable size of the boom cylinder, but also improve the structural strength of the joint between the first half cylinder 1 and the second half cylinder 2, thereby ensuring the safety of the operation.

[0061] by Figure 4 The example shown is used for explanation. In actual production, the two guide plates 30 can be welded to the second side plate 22 respectively, and the two guide plates 30 extend toward the first side plate 12 to form the plug-in structure 3; then the two first side plates 12 are plugged into the two guide plates 30 and adjusted to a predetermined position; and the first side plate 12 is welded to the guide plates 30. It is understandable that the guide plates 30 can also be welded to the first side plate 12 first and then plugged into the second side plate 22.

[0062] In some embodiments, the first base plate 11 includes two connected first plate portions 111 , and the angle between the two first plate portions 111 is an obtuse angle, so as to increase the section modulus of the boom cylinder, thereby improving the lateral bending stiffness and torsional stiffness of the boom cylinder cross section.

[0063] Exemplarily, the two first side plates 12 are respectively connected to the end of one of the first plate portions 111 , and the angle between the first side plate 12 and the second plate portion 211 is also an obtuse angle.

[0064] Exemplarily, the first bottom plate 11 and the two first side plates 12 may be integrally formed, or spliced ​​together by a welding process, preferably integrally formed.

[0065] In some embodiments, the second base plate 21 includes five second plate portions 211 connected in sequence, and the angle between two adjacent second plate portions 211 is an obtuse angle, so as to further increase the section modulus of the boom cylinder and improve the lateral bending stiffness and torsional stiffness of the boom cylinder cross section.

[0066] Exemplarily, the two second side plates 22 are respectively connected to the end of one of the second plate portions 211 located at both ends, and an obtuse angle is also formed between the second side plate 22 and the second plate portion 211 .

[0067] Exemplarily, the second bottom plate 21 and the two second side plates 22 may be integrally formed, or spliced ​​together by a welding process, preferably integrally formed.

[0068] like Figure 3 and Figure 4 As shown, when the plug-in structure 3 is a guide plate 30, the overall structure of the boom cylinder is a 9-sided structure. The boom cylinder configured in this way has better anti-extrusion performance and anti-local instability capability.

[0069] On the other hand, the utility model also provides a crane, which includes a boom cylinder as described in the above embodiments, including a first half cylinder 1, a second half cylinder 2 and an insert structure 3. The first half cylinder 1 and the second half cylinder 2 are spliced ​​together to form a boom cylinder, and the insert structure 3 is arranged at the joint of the first half cylinder 1 and the second half cylinder 2.

[0070] Specifically, the first half cylinder 1 and the second half cylinder 2 are both thin-walled structures, and the cross-sections of the first half cylinder 1 and the second half cylinder 2 are arched structures and form notches, and the notches of the first half cylinder 1 and the second half cylinder 2 are arranged opposite to each other so as to be spliced ​​together to form the above-mentioned boom cylinder. The insertion structure 3 is suitable for inserting the notches of the first half cylinder 1 and the notches of the second half cylinder 2 relative to each other so as to adjust the relative positions of the first half cylinder 1 and the second half cylinder 2.

[0071] In this embodiment, under the action of the insertion structure 3, the notches of the first half cylinder 1 and the second half cylinder 2 are relatively inserted, and by adjusting the relative insertion depth between the two, the relative position between the first half cylinder 1 and the second half cylinder 2 can be changed, thereby achieving fine adjustment of the size of the boom cylinder, facilitating accurate control of the size of the boom cylinder, ensuring the molding size of the boom cylinder, and not being affected by the size error of the first half cylinder 1 and the second half cylinder 2, nor by the production process. Therefore, the boom cylinder provided by this embodiment can accurately control the molding size of the boom cylinder, ensuring the consistency of the size of the boom cylinder, so as to facilitate later assembly.

[0072] The boom cylinder and the crane of the utility model can ensure the forming size of the boom cylinder by fine-tuning the size of the boom cylinder, so that the size of the boom cylinder is consistent and easy to assemble; and the welding accuracy is easy to control, which ensures the welding strength of the boom cylinder, so the boom cylinder is safer.

[0073] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A boom cylinder, characterized in that: include: A first half cylinder (1) and a second half cylinder (2), wherein the first half cylinder (1) and the second half cylinder (2) are both thin-walled structures, and the cross-sections of the first half cylinder (1) and the second half cylinder (2) are arched structures and form notches, and the notches of the first half cylinder (1) and the second half cylinder (2) are arranged opposite to each other and are spliced ​​together to form the boom cylinder; The plug-in structure (3) is arranged at the joint between the first half cylinder (1) and the second half cylinder (2); the plug-in structure (3) is suitable for making the notch of the first half cylinder (1) and the notch of the second half cylinder (2) relatively inserted to adjust the relative position of the first half cylinder (1) and the second half cylinder (2).

2. The boom cylinder according to claim 1, characterized in that: The first half cylinder (1) comprises a first bottom plate (11) and two first side plates (12), the first bottom plate (11) is connected between the two first side plates (12), the two first side plates (12) form a notch of the first half cylinder (1), and the ends of the two first side plates (12) along a direction perpendicular to the extension direction of the boom cylinder form a first splicing end (10); The second half cylinder (2) comprises a second bottom plate (21) and two second side plates (22), the second bottom plate (21) is connected between the two second side plates (22), the two second side plates (22) form a notch of the second half cylinder (2), and the ends of the two second side plates (22) along a direction perpendicular to the extension direction of the boom cylinder form a second splicing end (20); Wherein, along the extension direction perpendicular to the boom cylinder, the first splicing end (10) and the second splicing end (20) are staggered to form the plug-in structure (3).

3. The boom cylinder according to claim 2, characterized in that: The first half cylinder (1) is arranged above the second half cylinder (2), the first splicing end (10) covers the outer side of the second splicing end (20), and the first splicing end (10) and the second splicing end (20) are welded.

4. The boom cylinder according to claim 2, characterized in that: The first half cylinder (1) is arranged above the second half cylinder (2), the second splicing end (20) covers the outer side of the first splicing end (10), and the second splicing end (20) is welded to the first splicing end (10).

5. The boom cylinder according to claim 1, characterized in that: The first half cylinder (1) comprises a first bottom plate (11) and two first side plates (12), the first bottom plate (11) is connected between the two first side plates (12), the two first side plates (12) form a notch of the first half cylinder (1), and the ends of the two first side plates (12) along a direction perpendicular to the extension direction of the boom cylinder form a first splicing end (10); The second half cylinder (2) comprises a second bottom plate (21) and two second side plates (22), the second bottom plate (21) is connected between the two second side plates (22), the two second side plates (22) form a notch of the second half cylinder (2), and the ends of the two second side plates (22) along a direction perpendicular to the extension direction of the boom cylinder form a second splicing end (20); The plug-in structure (3) comprises two guide plates (30), and the two guide plates (30) are respectively connected between the first splicing end (10) of the two correspondingly arranged first side plates (12) and the second splicing end (20) of the second side plates (22); along the extension direction perpendicular to the boom cylinder, the guide plates (30) are staggered with the first splicing end (10) and the second splicing end (20).

6. The boom cylinder according to claim 5, characterized in that: The guide plate (30) is welded to the same side of the first side plate (12) and the second side plate (22).

7. The boom cylinder according to claim 6, characterized in that: The two guide plates (30) both cover the inner sides of the first side plate (12) and the second side plate (22); or, The two guide plates (30) both cover the outer sides of the first side plate (12) and the second side plate (22).

8. The boom cylinder according to any one of claims 2 to 7, characterized in that: The first bottom plate (11) comprises two connected first plate portions (111), and the angle between the two first plate portions (111) is an obtuse angle.

9. The boom cylinder according to any one of claims 2 to 7, characterized in that: The second bottom plate (21) comprises five second plate portions (211) connected in sequence, and the angle between two adjacent second plate portions (211) is an obtuse angle.

10. A crane, characterized in that: include: A boom cylinder as claimed in any one of claims 1 to 9.

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