Jib structure, boom structure and aerial platform fire truck

Abstract

The application provides a curved arm structure, an arm support structure and an aerial platform fire truck, wherein the curved arm structure comprises: a curved arm comprising a plurality of connected side walls, the plurality of side walls being connected to form a mounting cavity, one end of the curved arm being used for being connected with an arm support body, and the other end of the curved arm being used for being connected with a balance arm; and a first driving member arranged in the mounting cavity, the first driving member being connected with the curved arm and the balance arm, and the first driving member being used for changing the included angle between the curved arm and the balance arm.

Description

Technical Field

[0001] This invention relates to the field of fire truck technology, and more specifically, to a boom structure, a boom structure, and an aerial platform fire truck. Background Technology

[0002] In related technologies, the boom structure includes a first boom, a second boom, and a bucket assembly. One end of the first boom is rotatably connected to one end of the second boom. The other end of the first boom is rotatably connected to the bucket assembly. The other end of the second boom is rotatably connected to a turntable. The boom structure adjusts the angle between the first boom and the bucket assembly via a first hydraulic component.

[0003] In the process of realizing this invention, the inventors discovered at least the following problems in the related technology: the boom structure only uses the first hydraulic component to level the working bucket assembly, and the leveling stability is relatively poor. Summary of the Invention

[0004] In order to solve or improve at least one of the above-mentioned technical problems, one object of the present invention is to provide a crank arm structure.

[0005] Another object of the present invention is to provide a boom structure.

[0006] Another object of the present invention is to provide an aerial platform fire truck.

[0007] To achieve the above objectives, the first aspect of the present invention provides a crank arm structure, comprising: a crank arm including a plurality of connected sidewalls, the plurality of sidewalls forming a mounting cavity, one end of the crank arm being used to connect to the boom body, and the other end of the crank arm being used to connect to the counterweight arm; a first drive member disposed within the mounting cavity, the first drive member being connected to the crank arm and the first drive member being connected to the counterweight arm, the first drive member being used to change the angle between the crank arm and the counterweight arm.

[0008] According to the technical solution of the articulated boom structure provided by the present invention, the first drive component of the articulated boom structure is used to change the angle between the articulated boom and the counterweight arm. Since the counterweight arm is connected to the bucket assembly, controlling the first drive component can level the bucket assembly. The third drive component is used to change the angle between the articulated boom and the first boom, and controlling the third drive component can assist the first drive component in leveling the bucket assembly. At least two drive components (including the first drive component and the third drive component) of the boom structure can simultaneously level the bucket assembly, resulting in higher leveling stability. In addition, the articulated boom is a boom cylinder structure with a mounting cavity. The first drive component is placed in the mounting cavity, which can effectively avoid motion interference between the first drive component and other components, and also improve the convenience of retracting and extending the articulated boom structure.

[0009] The articulated boom structure connects the boom body and the bucket assembly of the boom structure. Specifically, the articulated boom structure includes a curved boom and a first drive component. The curved boom includes multiple connected side walls. These side walls together form a mounting cavity. In other words, the curved boom is a boom cylinder structure with a mounting cavity. Optionally, at least two (two or more) side walls form a first cover plate and a second cover plate. The first and second cover plates are bent structures. Optionally, the multiple side walls of the curved boom are relatively fixed together by welding, which is simple to process and easy to operate; or, the curved boom is a one-piece bent structure, which, compared to post-processing, has better mechanical properties, higher connection strength, and helps reduce the number of parts and improve assembly efficiency. Furthermore, since the curved boom has a mounting cavity, compared to a solid curved boom design, it helps reduce the weight of the curved boom, save materials, and lower costs.

[0010] Further, one end of the articulated boom is used to connect to the boom body, and the other end is used to connect to the counterweight boom. Optionally, the boom body includes a first boom and a second boom. One end of the first boom is connected to a turntable. The other end of the first boom is rotatably connected to one end of the second boom. The other end of the second boom is rotatably connected to one end of the articulated boom. Optionally, the counterweight boom is connected to the bucket assembly. Optionally, the boom structure includes a third drive component. The third drive component is connected to the second boom of the boom body, and the third drive component is also connected to the articulated boom. The third drive component is used to change the angle between the articulated boom and the second boom, and controlling the third drive component can assist the first drive component in leveling the bucket assembly.

[0011] Furthermore, the first drive component is located within the mounting cavity. The first drive component is connected to the crank arm and also to the balance arm. The first drive component is used to change the angle between the crank arm and the balance arm. Since the balance arm is connected to the bucket assembly, controlling the first drive component allows for leveling of the bucket assembly. The cooperation between the first and third drive components improves the leveling effect of the bucket assembly. Additionally, placing the first drive component within the mounting cavity effectively avoids motion interference between the first drive component and other components, and also improves the ease of retracting and extending the crank arm structure. Optionally, the first drive component is a leveling cylinder.

[0012] By setting up a curved boom, the boom body and the work bucket assembly can be connected, and the curved boom ladder assembly can be supported. Optionally, the outer contour shape of the curved boom's cross-section is polygonal. This ensures sufficient structural strength and provides ample installation space for the first drive component, effectively preventing motion interference between the first drive component and other components. Optionally, the outer contour shape of the curved boom's cross-section is octagonal.

[0013] In the technical solution defined by the present invention, the articulated arm has a mounting cavity, and the first driving component is placed in the mounting cavity. On the one hand, this can effectively avoid motion interference between the first driving component and other components, and on the other hand, it can improve the convenience of folding and unfolding the articulated arm structure.

[0014] In addition, the technical solution provided by the present invention may also have the following additional technical features:

[0015] The above technical solution also includes: a curved arm ladder assembly, comprising: a fixed ladder connected to the curved arm; a movable ladder movably disposed on the fixed ladder; and a second drive member connected to the fixed ladder and the movable ladder, the second drive member being used to drive the movable ladder away from or towards the work bucket assembly.

[0016] In this technical solution, the articulated arm structure also includes an articulated arm ladder assembly. The articulated arm ladder assembly includes a fixed ladder and a movable ladder. Specifically, the fixed ladder is connected to the articulated arm. Optionally, the articulated arm ladder assembly also includes a support assembly. The support assembly is welded from multiple square tubes. Specifically, the support assembly includes a first square tube, a second square tube, a third square tube, and a fourth square tube. The second square tube is located at one end of the first square tube, and the third square tube is located at the other end of the first square tube. The second and third square tubes are located on the same side of the first square tube. The first, second, and third square tubes form an approximately U-shaped structure. Further, the fourth square tube is located on the other side of the first square tube. The fourth square tube is used to connect to the articulated arm. The second and third square tubes are used to connect to the fixed ladder of the articulated arm ladder assembly. The support assembly can also be any other structure used to connect the fixed ladder and the articulated arm, such as a support rod or support block.

[0017] Optionally, the fixed ladder includes two first supports and three second supports. The two first supports are arranged in parallel. One end of each second support is connected to one of the first supports, and the other end is connected to the other first support. The three second supports are parallel to each other. The first supports are connected to the curved arm via support components. Optionally, the first supports are made of shaped tubing. The second supports are made of non-slip square tubing. Optionally, the fixed ladder also includes a first handrail, which is connected to the first supports. The fixed ladder can also be any other structure used for climbing.

[0018] Furthermore, the movable ladder is movably mounted on the fixed ladder. The movable ladder can move relative to the fixed ladder. Optionally, the movable ladder includes two third supports and two fourth supports. The two third supports are arranged in parallel. One end of the fourth support is connected to the third support, and the other end of the fourth support is also connected to the third support. The fourth supports are parallel to each other. Optionally, the third supports are made of shaped tubing. The fourth supports are made of non-slip square tubing. Optionally, the movable ladder also includes a second handrail, which is connected to the third support. Optionally, the movable ladder can also be any other structure for climbing. Optionally, the fixed ladder is provided with a limiting rail. By providing the limiting rail, the movable ladder can move relative to the fixed ladder along the limiting rail. Optionally, the fixed ladder also includes a support mounting base. The support mounting base is connected to the first support. The support mounting base is used to connect other components.

[0019] The articulated ladder assembly is connected to the articulated arm and can rotate with the articulated arm. Since the movable ladder is movably mounted on the fixed ladder, the overall length of the articulated ladder assembly can be increased when the movable ladder moves relative to the fixed ladder. Adjusting the overall length of the articulated ladder assembly according to different working conditions ensures that the gap between the articulated ladder and the ladder frame is minimized when finally deployed, and that the space required to place the articulated arm is reduced when retracted, thus lowering the possibility of interference.

[0020] Optionally, the articulated ladder assembly also includes a locking element. The locking element limits the range of movement of the movable ladder so that it remains in its current position after reaching a suitable location. Optionally, both the movable and fixed ladders have limiting holes, and the locking element, which is a bolt or screw, passes through the limiting holes to achieve the locking function.

[0021] Furthermore, the articulated boom ladder assembly also includes a second drive component. Specifically, the second drive component is connected to both the fixed ladder and the movable ladder. By providing the second drive component, the movable ladder can be driven to move away from or towards the work bucket assembly. The relative movement of the movable ladder and the fixed ladder increases the overall length of the articulated boom ladder assembly. Adjusting the overall length of the articulated boom ladder assembly according to different working conditions ensures that the gap between the articulated boom ladder and the ladder is minimized when finally deployed, and that the space required for placing the articulated boom is reduced when retracted, thus lowering the possibility of interference. Optionally, the second drive component is a hydraulic cylinder. Optionally, the movable ladder is equipped with a hydraulic cylinder support for connecting to the hydraulic cylinder (second drive component).

[0022] Optionally, the boom body also includes a second ladder, which is mounted on the second boom. A second drive unit can drive the movable ladder to move relative to the fixed ladder between the second ladder and the work bucket assembly. During the movement of the movable ladder relative to the fixed ladder, it gradually approaches the work bucket assembly or the second ladder, facilitating firefighters to pass sequentially through the second ladder, the movable ladder, and the work bucket assembly, or sequentially through the work bucket assembly, the movable ladder, and the second ladder, thus improving installation convenience.

[0023] The above technical solution also includes: a first reinforcing plate, connected to the crank arm, the first reinforcing plate being disposed at one end where the crank arm is connected to the boom body, and the first reinforcing plate being rotatably connected to the boom body; and a second reinforcing plate, connected to the crank arm, the second reinforcing plate being disposed at one end where the crank arm is connected to the counterweight arm, and the second reinforcing plate being rotatably connected to the counterweight arm.

[0024] In this technical solution, the articulated boom structure also includes a first reinforcing plate and a second reinforcing plate. Specifically, the first reinforcing plate is connected to the articulated boom and is located at the end where the articulated boom connects to the boom body. The first reinforcing plate is rotatably connected to the boom body via a first pin. It is worth noting that there is at least one first reinforcing plate; that is, there can be one, two, or more first reinforcing plates, which can be flexibly arranged according to actual needs. Optionally, when there are two or more first reinforcing plates, they are parallel to each other. The first reinforcing plate has a first pin hole, and the first pin passes through the first pin hole and the second boom of the boom body to achieve a rotatable connection between the articulated boom and the second boom. Optionally, the articulated boom structure also includes a first sealing plate. The first sealing plate is connected to the first reinforcing plate, and the first sealing plate and the first reinforcing plate are connected to form a box structure. The first sealing plate serves a sealing function.

[0025] Furthermore, the second reinforcing plate is connected to the crank arm and is located at the end where the crank arm connects to the balance arm. The second reinforcing plate is rotatably connected to the balance arm via a second pin. It is worth noting that there is at least one second reinforcing plate; that is, there can be one, two, or more second reinforcing plates, which can be flexibly arranged according to actual needs. Optionally, when there are two or more second reinforcing plates, they are parallel to each other. The second reinforcing plate has a second pin hole, through which the second pin passes and through the balance arm to achieve a rotatable connection between the crank arm and the balance arm. Optionally, the crank arm structure also includes a second sealing plate. The second sealing plate is connected to the second reinforcing plate, and the two plates form a box structure. The second sealing plate serves a sealing function.

[0026] By incorporating a first and second reinforcing plate, the articulated boom structure offers greater installation space and structural strength, making it easier for workers to connect the structure to the boom body or counterweight boom. The first and second reinforcing plates can be of any shape.

[0027] In the above technical solution, the outer contour shape of the cross-section of the curved arm is a polygon.

[0028] In this technical solution, by setting the outer contour shape of the crank arm's cross-section to a polygon, on the one hand, sufficient structural strength is ensured; on the other hand, it facilitates providing a sufficiently large installation space for placing the first drive component, effectively preventing motion interference between the first drive component and other components. Optionally, the outer contour shape of the crank arm's cross-section is octagonal.

[0029] A second aspect of the present invention provides a boom structure, comprising: a boom body; a counterweight arm; and a scissor arm structure as described in any of the above technical solutions, wherein one end of the scissor arm is connected to the boom body and the other end of the scissor arm is connected to the counterweight arm.

[0030] According to the technical solution of the boom structure of the present invention, the boom structure includes a boom body, a counterweight boom, and a curved boom structure as described in any of the above embodiments. Specifically, one end of the curved boom of the curved boom structure is connected to the boom body, and the other end of the curved boom is connected to the counterweight boom. The curved boom can connect the boom body and the bucket assembly, and also provide support for the curved boom ladder assembly.

[0031] In the above technical solution, the boom body includes: a first boom; a second boom, one end of the second boom being rotatably connected to the first boom, and the other end of the second boom being rotatably connected to the articulated boom.

[0032] In this technical solution, the boom body includes a first boom and a second boom. Specifically, one end of the second boom is rotatably connected to the first boom, allowing the second boom to rotate relative to the first boom. The other end of the second boom is rotatably connected to a cantilever boom, also allowing the second boom to rotate relative to the cantilever boom. Optionally, the boom body also includes a first ladder, which is mounted on the first boom. Optionally, the boom body also includes a second ladder, which is mounted on the second boom. The first and second ladders together form the ladder body.

[0033] Optionally, the first boom is a telescopic boom, meaning it can extend and retract to change its overall length. Optionally, the first ladder is connected to the first boom via a flange structure, and the first ladder can extend, retract, and rotate with the first boom.

[0034] Optionally, the second boom is a telescopic boom, meaning it can extend and retract to change its overall length. Optionally, the second ladder is connected to the second boom via a flange structure, allowing the second ladder to extend, retract, and rotate along with the second boom.

[0035] The above technical solution also includes: a third drive unit connected to the articulated boom, the third drive unit connected to the second boom, and the third drive unit used to change the angle between the second boom and the articulated boom.

[0036] In this technical solution, the boom structure also includes a third drive component. Specifically, the third drive component is connected to the articulated boom and also to the second boom. By providing the third drive component, the angle between the second boom and the articulated boom can be changed. In the technical solution defined by this invention, at least two drive components (including the first drive component and the third drive component) can simultaneously level the bucket assembly, resulting in higher leveling stability.

[0037] The above technical solution also includes: a fourth driving component, which is connected to the first boom and the second boom, and the fourth driving component is used to change the angle between the first boom and the second boom.

[0038] In this technical solution, the boom structure also includes a fourth drive component. Specifically, the fourth drive component is connected to the first boom and also to the second boom. By providing the fourth drive component, the angle between the first boom and the second boom can be changed.

[0039] The above technical solution also includes: a working bucket assembly connected to a counterweight arm.

[0040] In this technical solution, the boom structure also includes a work bucket assembly. Specifically, the work bucket assembly is connected to the counterweight boom. Optionally, the work bucket assembly includes a work bucket and a guardrail, which are interconnected. The work bucket assembly is used to carry firefighters.

[0041] Since the boom structure includes any of the articulated boom structures mentioned in the first aspect above, it has the beneficial effects of any of the above technical solutions, which will not be elaborated further here.

[0042] A third aspect of the present invention provides an aerial platform fire truck, comprising: a turntable; a boom structure as described in any of the above technical solutions, wherein the first boom of the boom structure is connected to the turntable.

[0043] According to the technical solution of the aerial platform fire truck of the present invention, the aerial platform fire truck includes a turntable and a boom structure as described in any of the above technical solutions. The first boom of the boom structure is connected to the turntable. The aerial platform fire truck is used for firefighters to conduct aerial rescue operations.

[0044] Additional aspects and advantages of the technical solutions of the present invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0045] Figure 1 A first schematic diagram of a crank arm structure according to an embodiment of the present invention is shown;

[0046] Figure 2 A schematic diagram of a support component according to an embodiment of the present invention is shown;

[0047] Figure 3 A schematic diagram of a fixed ladder according to an embodiment of the present invention is shown;

[0048] Figure 4 A schematic diagram of a movable ladder according to an embodiment of the present invention is shown;

[0049] Figure 5 A first schematic diagram of a crank arm according to an embodiment of the present invention is shown;

[0050] Figure 6 A second schematic diagram of a crank arm according to an embodiment of the present invention is shown;

[0051] Figure 7 A first schematic diagram of a boom structure according to an embodiment of the present invention is shown;

[0052] Figure 8 A schematic diagram of an aerial platform fire truck according to an embodiment of the present invention is shown;

[0053] Figure 9 A second schematic diagram of a boom structure according to an embodiment of the present invention is shown;

[0054] Figure 10 It shows Figure 9 A magnified view of part A in the diagram.

[0055] in, Figures 1 to 10 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0056] 100: Articulated arm structure; 110: Articulated arm; 111: First cover plate; 112: Second cover plate; 113: Mounting cavity; 120: First drive component; 130: Articulated arm ladder assembly; 131: Fixed ladder; 1311: First support; 1312: Second support; 1313: First handrail; 132: Movable ladder; 1321: Third support; 1322: Fourth support; 1323: Second handrail; 133: Support assembly; 1331: First square tube; 1332: Second square tube; 1 333: Third-party pipe; 1334: Fourth-party pipe; 134: Second driving component; 141: First reinforcing plate; 142: Second reinforcing plate; 151: First connecting rod; 152: Second connecting rod; 200: Boom structure; 210: Boom body; 211: First boom; 212: Second boom; 213: Second ladder; 220: Counterweight boom; 230: Third driving component; 240: Fourth driving component; 250: Working bucket assembly; 300: Aerial platform fire truck; 310: Turntable. Detailed Implementation

[0057] To better understand the above-described objectives, features, and advantages of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0058] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, embodiments of the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0059] The following reference Figures 1 to 10 The articulated boom structure 100, boom structure 200, and aerial platform fire truck 300 provided according to some embodiments of the present invention are described.

[0060] In one embodiment of the present invention, such as Figure 1 and Figure 8 As shown, the articulated arm structure 100 includes an articulated arm 110 and a first drive member 120. Wherein, as... Figure 5 and Figure 6 As shown, the articulated boom 110 includes multiple connected sidewalls. These sidewalls together form a mounting cavity 113. In other words, the articulated boom 110 is a boom tube structure with the mounting cavity 113. Optionally, at least two (two or more) sidewalls form a first cover plate 111 and a second cover plate 112. The first cover plate 111 and the second cover plate 112 are bent structures. Optionally, the multiple sidewalls are fixed relative to each other by welding, which is simple to process and easy to operate; or, the articulated boom 110 is a one-piece bent structure, which, compared to post-processing, has better mechanical properties, higher connection strength, and helps reduce the number of parts and improve assembly efficiency. Furthermore, since the articulated boom 110 has the mounting cavity 113, compared to a solid structure design, it helps to reduce the weight of the articulated boom 110, save materials, and reduce costs.

[0061] Furthermore, such as Figure 7 and Figure 8As shown, one end of the articulated boom 110 is connected to the boom body 210, and the other end is connected to the counterweight boom 220. Optionally, the boom body 210 includes a first boom 211 and a second boom 212. One end of the first boom 211 is connected to the turntable 310. The other end of the first boom 211 is rotatably connected to one end of the second boom 212. The other end of the second boom 212 is rotatably connected to one end of the articulated boom 110. Optionally, the counterweight boom 220 is connected to the bucket assembly 250. Optionally, the boom structure 200 includes a third drive member 230. The third drive member 230 is connected to the second boom 212 of the boom body 210, and also connected to the articulated boom 110. The third drive member 230 is used to change the angle between the articulated boom 110 and the second boom 212, and controlling the third drive member 230 can assist the first drive member 120 in leveling the bucket assembly 250.

[0062] Furthermore, the first drive member 120 is disposed within the mounting cavity 113. The first drive member 120 is connected to the crank arm 110 and also to the balance arm 220. The first drive member 120 is used to change the angle between the crank arm 110 and the balance arm 220. Since the balance arm 220 is connected to the work bucket assembly 250, controlling the first drive member 120 can level the work bucket assembly 250. The cooperation between the first drive member 120 and the third drive member 230 improves the leveling effect of the work bucket assembly 250. In addition, by placing the first drive member 120 within the mounting cavity 113, it effectively avoids motion interference between the first drive member 120 and other components, and also improves the ease of raising and lowering the crank arm structure 100. Optionally, the first drive member 120 is a leveling cylinder.

[0063] By setting the articulated boom 110, it can connect the boom body 210 and the work bucket assembly 250, and also provide support for the articulated boom ladder assembly 130. Optionally, the outer contour shape of the cross-section of the articulated boom 110 is polygonal. This ensures that the articulated boom 110 has sufficient structural strength and provides a sufficiently large installation space for placing the first drive component 120, effectively preventing the first drive component 120 from interfering with the movement of other components. Optionally, the outer contour shape of the cross-section of the articulated boom 110 is octagonal.

[0064] In the technical solution defined by the present invention, the articulated arm 110 has a mounting cavity 113, and the first driving member 120 is placed in the mounting cavity 113. On the one hand, it can effectively avoid the first driving member 120 from interfering with the movement of other components, and on the other hand, it is beneficial to improve the convenience of the articulated arm structure 100 in retracting and unfolding.

[0065] In one embodiment of the present invention, such as Figure 1 and Figure 7 As shown, the articulated boom structure 100 also includes an articulated boom ladder assembly 130. The articulated boom ladder assembly 130 includes a fixed ladder 131 and a movable ladder 132. Specifically, the fixed ladder 131 is connected to the articulated boom 110. Optionally, as... Figure 1 and Figure 2 As shown, the articulated ladder assembly 130 also includes a support assembly 133. The support assembly 133 is welded from multiple square tubes. Specifically, the support assembly 133 includes a first square tube 1331, a second square tube 1332, a third square tube 1333, and a fourth square tube 1334. The second square tube 1332 is located at one end of the first square tube 1331, and the third square tube 1333 is located at the other end of the first square tube 1331. The second square tube 1332 and the third square tube 1333 are located on the same side of the first square tube 1331. The first square tube 1331, the second square tube 1332, and the third square tube 1333 form an approximately U-shaped structure. Further, the fourth square tube 1334 is located on the other side of the first square tube 1331. The fourth square tube 1334 is used to connect to the articulated arm 110. The second square tube 1332 and the third square tube 1333 are used to connect to the fixed ladder 131 of the articulated ladder assembly 130. The support assembly 133 can also be any other structure used to connect the fixed ladder 131 and the curved arm 110, such as a support rod or support block.

[0066] Optionally, such as Figure 3 As shown, the fixed ladder 131 includes two first supports 1311 and three second supports 1312. The two first supports 1311 are arranged in parallel. One end of each second support 1312 is connected to one of the first supports 1311, and the other end is connected to the other first support 1311. The three second supports 1312 are parallel to each other. The first supports 1311 are connected to the curved arm 110 via a support assembly 133. Optionally, the first supports 1311 are shaped tubular materials. The second supports 1312 are non-slip square tubular materials. Optionally, the fixed ladder 131 also includes a first handrail 1313, which is connected to the first supports 1311. The fixed ladder 131 can also be any other structure for climbing.

[0067] Furthermore, the movable ladder 132 is movably disposed on the fixed ladder 131. The movable ladder 132 is capable of moving relative to the fixed ladder 131. Optionally, such as Figure 4As shown, the movable ladder 132 includes two third supports 1321 and two fourth supports 1322. The two third supports 1321 are arranged in parallel. One end of the fourth support 1322 is connected to the third support 1321, and the other end of the fourth support 1322 is also connected to the third support 1321. The fourth supports 1322 are parallel to each other. Optionally, the third support 1321 is a shaped tube. The fourth support 1322 is a non-slip square tube. Optionally, the movable ladder 132 also includes a second handrail 1323, which is connected to the third support 1321. Optionally, the movable ladder 132 can also be any other structure for climbing. Optionally, the fixed ladder 131 is provided with a limiting rail. By providing the limiting rail, the movable ladder 132 can move relative to the fixed ladder 131 along the limiting rail. Optionally, the fixed ladder 131 also includes a support mounting base. The support mounting base is connected to the first support 1311. The support mounting base is used to connect other components.

[0068] The articulated ladder assembly 130 is connected to the articulated arm 110, and the articulated ladder assembly 130 can rotate together with the articulated arm 110. Since the movable ladder 132 is movably mounted on the fixed ladder 131, the overall length of the articulated ladder assembly 130 can be increased when the movable ladder 132 moves relative to the fixed ladder 131. By changing the overall length of the articulated ladder assembly 130 according to different working conditions, it is ensured that the gap between the articulated ladder and the ladder is reduced when it is finally deployed, and the placement space of the articulated arm 110 is reduced when it is retracted, thus reducing the possibility of interference.

[0069] Optionally, the articulated ladder assembly 130 also includes a locking element. The locking element is used to limit the range of movement of the movable ladder 132 so that the movable ladder 132 remains in its current position after being moved to a suitable position. Optionally, the movable ladder 132 and the fixed ladder 131 are provided with limiting holes, and the locking element is a bolt or screw, which passes through the limiting hole to achieve the locking function.

[0070] In one embodiment of the present invention, such as Figure 1 As shown, the articulated boom ladder assembly 130 also includes a second drive member 134. Specifically, the second drive member 134 is connected to the fixed ladder 131 and the movable ladder 132. By setting the second drive member 134, the movable ladder 132 can be driven to move away from or towards the work bucket assembly 250. When the movable ladder 132 moves relative to the fixed ladder 131, the overall length of the articulated boom ladder assembly 130 can be increased. By changing the overall length of the articulated boom ladder assembly 130 according to different working conditions, it is ensured that the gap between the articulated boom ladder and the ladder can be reduced when it is finally deployed, and the placement space of the articulated boom 110 can be reduced when it is retracted, thus reducing the possibility of interference. Optionally, the second drive member 134 is a drive cylinder. Optionally, the movable ladder 132 is provided with a cylinder support, which is used to connect with the drive cylinder (second drive member 134).

[0071] Optionally, such as Figure 7 and Figure 9 As shown, the boom body 210 also includes a second ladder 213, which is located on the second boom 212. The second drive unit 134 can drive the movable ladder 132 to move relative to the fixed ladder 131 between the second ladder 213 and the work bucket assembly 250. During the movement of the movable ladder 132 relative to the fixed ladder 131, it gradually approaches the work bucket assembly 250 or the second ladder 213, so as to facilitate firefighters to pass through the second ladder 213, the movable ladder 132 and the work bucket assembly 250 in sequence, or pass through the work bucket assembly 250, the movable ladder 132 and the second ladder 213 in sequence, thereby improving installation convenience.

[0072] In one embodiment of the present invention, such as Figure 1 and Figure 5 As shown, the articulated boom structure 100 also includes a first reinforcing plate 141 and a second reinforcing plate 142. Specifically, the first reinforcing plate 141 is connected to the articulated boom 110, and is located at the end of the articulated boom 110 connected to the boom body 210. The first reinforcing plate 141 is rotatably connected to the boom body 210 via a first pin. It is worth noting that the number of first reinforcing plates 141 is at least one, that is, there can be one, two, or more first reinforcing plates, which can be flexibly arranged according to actual needs. Optionally, when there are two or more first reinforcing plates 141, the first reinforcing plates 141 are parallel to each other. The first reinforcing plate 141 is provided with a first pin hole, and the first pin passes through the first pin hole and the second boom 212 of the boom body 210 to realize the rotatable connection between the articulated boom 110 and the second boom 212. Optionally, the articulated boom structure 100 also includes a first sealing plate. The first sealing plate is connected to the first reinforcing plate 141, and the connection between the first sealing plate and the first reinforcing plate 141 forms a box structure. The first sealing plate serves to seal the box.

[0073] Furthermore, such as Figure 1 and Figure 5As shown, the second reinforcing plate 142 is connected to the crank arm 110, and is located at the end where the crank arm 110 connects to the balance arm 220. The second reinforcing plate 142 is rotatably connected to the balance arm 220 via a second pin. It is worth noting that the number of second reinforcing plates 142 is at least one; that is, there can be one, two, or more second reinforcing plates, which can be flexibly arranged according to actual needs. Optionally, when there are two or more second reinforcing plates 142, they are parallel to each other. The second reinforcing plate 142 has a second pin hole, through which the second pin passes and through the balance arm 220 to achieve a rotatable connection between the crank arm 110 and the balance arm 220. Optionally, the crank arm structure 100 also includes a second sealing plate. The second sealing plate is connected to the second reinforcing plate 142, and the connection between the second sealing plate and the second reinforcing plate 142 forms a box structure. The second sealing plate serves a sealing function.

[0074] By incorporating the first reinforcing plate 141 and the second reinforcing plate 142, the articulated boom structure 100 has greater installation space and structural strength, making it easier for operators to connect the articulated boom structure 100 to the boom body 210 or the counterweight boom 220. The first reinforcing plate 141 and the second reinforcing plate 142 can be structures of any shape.

[0075] In one embodiment of the invention, the crank arm 110 is rotatably connected to the balance arm 220 via a second reinforcing plate 142. For example... Figure 10 As shown, the articulated arm structure 100 also includes a first connecting rod 151 and a second connecting rod 152. One end of the first connecting rod 151 is connected to the balance arm 220 via a pin. The other end of the first connecting rod 151 is connected to one end of the second connecting rod 152. The other end of the second connecting rod 152 is connected to the first driving member 120. The balance arm 220, the first connecting rod 151, the second connecting rod 152, and the first driving member 120 constitute a linkage mechanism.

[0076] Optionally, sensors are installed on the boom body 210, the articulated boom 110, and the counterweight boom 220. Based on sensor detection, the articulated boom cylinder (i.e., the third drive component 230) and the leveling cylinder (i.e., the first drive component 120) are automatically adjusted, allowing the articulated boom 110 to rotate relative to the second boom 212 of the boom body 210, and the counterweight boom 220 to rotate relative to the articulated boom 110, thus keeping the counterweight boom 220 and the work bucket assembly 250 in a horizontal position at all times. Furthermore, the articulated ladder assembly 130 also rotates with the articulated boom 110, adjusting the relative position between the movable ladder 132 and the fixed ladder 131 via the second drive component 134, so that the movable ladder 132 moves away from or closer to the second ladder 213.

[0077] In one embodiment of the present invention, such as Figure 6As shown, the outer contour shape of the cross-section of the articulated arm 110 is polygonal. By setting the outer contour shape of the cross-section of the articulated arm 110 to a polygon, on the one hand, it ensures that the articulated arm 110 has sufficient structural strength; on the other hand, it helps to provide a sufficiently large installation space for placing the first drive component 120, effectively avoiding motion interference between the first drive component 120 and other components. Optionally, the outer contour shape of the cross-section of the articulated arm 110 is octagonal.

[0078] In one embodiment of the present invention, such as Figure 7 As shown, the boom structure 200 includes a boom body 210, a counterweight boom 220, and a cantilever structure 100 as described in any of the above embodiments. Specifically, one end of the cantilever boom 110 of the cantilever structure 100 is connected to the boom body 210, and the other end of the cantilever boom 110 is connected to the counterweight boom 220. The cantilever boom 110 can connect the boom body 210 and the bucket assembly 250, and also provide support for the cantilever ladder assembly 130.

[0079] Further, the boom body 210 includes a first boom 211 and a second boom 212. Specifically, one end of the second boom 212 is rotatably connected to the first boom 211, and the second boom 212 is rotatable relative to the first boom 211. The other end of the second boom 212 is rotatably connected to the articulated boom 110. The second boom 212 is rotatable relative to the articulated boom 110. Optionally, the boom body 210 also includes a first ladder, which is disposed on the first boom 211. Optionally, the boom body 210 also includes a second ladder 213, which is disposed on the second boom 212. The first ladder and the second ladder 213 constitute the ladder body.

[0080] Optionally, the first boom 211 is a telescopic boom, meaning that the first boom 211 can extend and retract to change its overall length. Optionally, the first ladder is connected to the first boom 211 via a flange structure, and the first ladder can extend, retract, and rotate with the first boom 211.

[0081] Optionally, the second boom 212 is a telescopic boom, meaning that the second boom 212 can extend and retract to change its overall length. Optionally, the second ladder 213 is connected to the second boom 212 via a flange structure, and the second ladder 213 can extend, retract, and rotate with the second boom 212.

[0082] In another embodiment, the boom structure 200 further includes a third drive member 230. Specifically, the third drive member 230 is connected to the articulated boom 110 and also to the second boom 212. By providing the third drive member 230, the angle between the second boom 212 and the articulated boom 110 can be changed. In the technical solution defined by this invention, at least two drive members (including the first drive member 120 and the third drive member 230) can simultaneously level the bucket assembly 250, resulting in higher leveling stability.

[0083] In another embodiment, the boom structure 200 further includes a fourth drive member 240. Specifically, the fourth drive member 240 is connected to the first boom 211 and the second boom 212. By providing the fourth drive member 240, the angle between the first boom 211 and the second boom 212 can be changed.

[0084] In another embodiment, the boom structure 200 also includes a bucket assembly 250. Specifically, the bucket assembly 250 is connected to the counterweight boom 220. Optionally, the bucket assembly 250 includes a bucket and a guardrail, which are interconnected. The bucket assembly 250 is used to carry firefighters.

[0085] In one embodiment of the present invention, the first boom 211 is a telescopic boom. The first boom 211 is connected to the turntable 310 via a tail pin. The second boom 212 is connected to the first boom 211 via a luffing cylinder (fourth drive member 240), a connecting rod assembly, and a pin. The second boom 212 is connected to the articulated boom 110 via an articulated boom cylinder (third drive member 230) and a pin. The articulated boom 110 is connected to the counterweight boom 220 via a leveling cylinder (first drive member 120), a connecting rod assembly, and a pin. The counterweight boom 220 is connected to the work bucket assembly 250 via a pin. The first ladder is fixedly connected to the first boom 211. The second ladder 213 is fixedly connected to the second boom 212. The articulated boom 110 is fixedly connected to the articulated boom ladder assembly 130 via a support assembly 133.

[0086] In one embodiment of the invention, the articulated boom structure 100 further includes reinforcing plates. Optionally, the number of reinforcing plates is four. The reinforcing plates are fixed to the articulated boom 110 by welding. The articulated boom structure 100 also includes a sealing plate for sealing. The reinforcing plate is provided with double-layer hinge point holes. Optionally, the number of double-layer hinge point holes is four. The double-layer hinge point holes are used to connect the connecting rod assembly.

[0087] Optionally, a steel pipe passes through four reinforcing plates to connect the second boom 212. A double-layer hole is opened in the middle of the four reinforcing plates to connect the leveling cylinder (first drive component 120). A single-layer hole is opened in the two middle reinforcing plates to connect the articulated boom cylinder (third drive component 230).

[0088] In one embodiment of the present invention, such as Figure 8 As shown, the aerial platform fire truck 300 includes a turntable 310 and a boom structure 200 as described in any of the above embodiments. The first boom 211 of the boom structure 200 is connected to the turntable 310. The aerial platform fire truck 300 is used for firefighters to conduct aerial rescue operations.

[0089] In one embodiment of the present invention, after the boom structure 200 is augmented with the articulated boom structure 100, the work bucket assembly 250 can remain horizontal from its initial state without tipping over. The entire boom structure 200 unfolds and levels itself in three steps:

[0090] In the first step, during the initial luffing process (≤45 degrees), the second boom 212 and the luffing cylinder (fourth drive component 240) remain stationary. The working bucket assembly 250 is kept horizontal mainly by the joint control and adjustment of the extension of the boom cylinder (third drive component 230) and the retraction of the leveling cylinder (first drive component 120).

[0091] The second step is that when the first boom 211 luffs for the second time (>45 degrees), the second boom 212 and the luffing cylinder also begin to luff, while the boom cylinder and the leveling cylinder continue to work together to keep the work bucket assembly 250 level.

[0092] The third step is to keep the working bucket assembly 250 level and reach its maximum height when the boom 110 is parallel to the second boom 212 (when the boom cylinder is fully extended). This is achieved by the combined control of the luffing cylinder and the leveling cylinder.

[0093] When the articulated boom 110, the second boom 212, and the first boom 211 are parallel (at maximum height), there is a relatively large gap between the second ladder 213 and the articulated boom ladder assembly 130. At this time, the second drive component 134 pushes the movable ladder 132 to move and unfold on the fixed ladder 131, thereby shortening the distance between the articulated boom ladder assembly 130 and the second ladder 213. The gap between the fixed ladder 131 and the work bucket assembly 250 is small, and they can be connected by the flipping pedal of the work bucket assembly 250, thus connecting the work bucket assembly 250 and the articulated boom ladder assembly 130 for rescuers to climb.

[0094] According to embodiments of the articulated boom structure, boom structure, and aerial platform fire truck of the present invention, the first drive component of the articulated boom structure is used to change the angle between the articulated boom and the counterweight boom. Since the counterweight boom is connected to the working bucket assembly, controlling the first drive component can level the working bucket assembly. The third drive component is used to change the angle between the articulated boom and the first boom, and controlling the third drive component can assist the first drive component in leveling the working bucket assembly. At least two drive components (including the first drive component and the third drive component) of the boom structure can simultaneously level the working bucket assembly, resulting in higher leveling stability. In addition, the articulated boom is a boom cylinder structure with a mounting cavity. The first drive component is placed in the mounting cavity, which effectively avoids motion interference between the first drive component and other components, and also improves the convenience of retracting and extending the articulated boom structure.

[0095] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0096] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0097] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0098] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A crank arm structure characterized by, include: The articulated boom (110) includes multiple connected sidewalls, which together form a mounting cavity (113). One end of the articulated boom (110) is used to connect to the boom body (210), and the other end of the articulated boom (110) is used to connect to the counterweight boom (220). A first driving member (120) is disposed in the mounting cavity (113). The first driving member (120) is connected to the crank arm (110) and the balance arm (220). The first driving member (120) is used to change the angle between the crank arm (110) and the balance arm (220). The articulated ladder assembly (130) includes: A fixed ladder (131) is connected to the curved arm (110); The movable ladder (132) is movably mounted on the fixed ladder (131). The second drive member (134) is connected to the fixed ladder (131) and the second drive member (134) is connected to the movable ladder (132). The second drive member (134) is used to drive the movable ladder (132) away from or towards the work bucket assembly (250). The curved arm ladder assembly (130) is connected to the curved arm (110), and the curved arm ladder assembly (130) can rotate together with the curved arm (110).

2. The wrist structure of claim 1, wherein Also includes: The first reinforcing plate (141) is connected to the curved arm (110). The first reinforcing plate (141) is located at the end of the curved arm (110) connected to the boom body (210). The first reinforcing plate (141) is rotatably connected to the boom body (210). The second reinforcing plate (142) is connected to the crank arm (110). The second reinforcing plate (142) is located at the end where the crank arm (110) is connected to the balance arm (220). The second reinforcing plate (142) is rotatably connected to the balance arm (220).

3. The wrist structure of claim 1 or 2, wherein The outer contour shape of the cross section of the curved arm (110) is polygonal.

4. A boom structure, characterized by include: Boom body (210); counterweight arm (220); According to any one of claims 1 to 3, one end of the curved arm (110) of the curved arm structure is connected to the boom body (210), and the other end of the curved arm (110) is connected to the counterweight arm (220).

5. The structure of claim 4, wherein The boom body (210) includes: First boom (211); The second boom (212) has one end rotatably connected to the first boom (211) and the other end rotatably connected to the articulated boom (110).

6. The structure of claim 5, wherein Also includes: The third drive unit (230) is connected to the crank arm (110) and the second boom (212). The third drive unit (230) is used to change the angle between the second boom (212) and the crank arm (110).

7. The structure of claim 5, wherein Also includes: The fourth drive unit (240) is connected to the first boom (211) and the second boom (212). The fourth drive unit (240) is used to change the angle between the first boom (211) and the second boom (212).

8. The boom structure according to any one of claims 4 to 7, characterized in that, Also includes: The work bucket assembly (250) is connected to the balance arm (220).

9. A fire truck with an aerial platform, characterized in that, include: Turntable (310); The boom structure as described in any one of claims 4 to 8, wherein the first boom (211) of the boom structure is connected to the turntable (310).

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