Sub-arm, boom assembly and crane

Abstract

The application relates to the field of crane structures, and discloses a sub-arm, an arm support assembly and a crane. The sub-arm comprises a connecting frame, a short-arm group and a long-arm group. The tail of the connecting frame is used for being connected with the head of a main arm; the tail of the short-arm group is connected with the head of the connecting frame, and the short-arm group comprises a short-arm section and a short-arm section luffing mechanism; the tail of the long-arm group is detachably connected with the head of the connecting frame; the sub-arm comprises a single-multiplying working mode and a multiple-multiplying working mode which can be switched with each other; in the single-multiplying working mode, the connecting frame and the long-arm group remain connected, and the sub-arm is used as a single-multiplying sub-arm; and in the multiple-multiplying working mode, the connecting frame and the long-arm group are disconnected, and the connecting frame and the short-arm group connected with each other are used as a multiple-multiplying sub-arm. The application can integrate the single-multiplying sub-arm and the multiple-multiplying sub-arm into one, realizes free switching of the sub-arm between the single-multiplying working mode and the multiple-multiplying working mode, and is beneficial to saving sub-arm layout space and reducing manufacturing cost.

Description

Technical Field

[0001] This application pertains to crane structures, specifically to the jib, boom assembly, and crane itself. Background Technology

[0002] Existing medium-tonnage cranes are generally equipped with two types of jib: one is a longer, lower-rated lifting capacity single-ratio jib, and the other is a shorter, stronger, higher-rated lifting capacity multi-ratio jib. (See [link to relevant documentation]). Figure 1 The top view of the boom shows that the longer single-rate jib and the shorter multi-rate jib are set on both sides of the main boom. This not only occupies a lot of space and is not conducive to the extension and retraction of the main boom, but also requires more fixed supports and pins, which increases the cost of use. Summary of the Invention

[0003] The purpose of this application is to provide a jib, a boom assembly, and a crane that can integrate a single-rate jib and a multi-rate jib into one unit, enabling free switching between single-rate and multi-rate operating modes, thereby saving jib layout space and reducing manufacturing costs.

[0004] To achieve the above objectives, the first aspect of this application provides a secondary arm, the secondary arm comprising:

[0005] A connecting frame, the tail of which is used to connect to the head of the main arm;

[0006] A boom assembly, the tail of which is connected to the head of the connecting frame, the boom assembly including a boom section and a boom section luffing mechanism for adjusting the pitch angle of the boom section relative to the connecting frame; and

[0007] The long arm assembly, the tail of which is detachably connected to the head of the connecting frame;

[0008] The auxiliary arm includes a switchable single-rate operating mode and a multi-rate operating mode. In the single-rate operating mode, the connecting frame and the long arm assembly remain connected, and the auxiliary arm is used as a single-rate auxiliary arm. In the multi-rate operating mode, the connecting frame and the long arm assembly are disconnected, and the interconnected connecting frame and the short arm assembly are used together as a multi-rate auxiliary arm.

[0009] In some embodiments, the auxiliary arm also includes a standby mode; in the standby mode, the auxiliary arm is arranged in the opposite direction and parallel to the main arm, and the tail side of the connecting frame can form a single-point hinge with the head side of the main arm.

[0010] In some embodiments, the tail side of the connecting frame is provided with a connecting frame tail ear plate, and the connecting frame tail ear plate is provided with a first inner locking hole and a first outer hinge hole arranged at intervals along the width direction of the auxiliary arm. The first outer hinge hole is used to form a single-point hinge of the main and auxiliary arms.

[0011] In some embodiments, the auxiliary boom further includes a connecting frame locking structure disposed on the side of the connecting frame, wherein in the standby mode, the connecting frame can be locked to the main boom by a single connecting frame locking structure.

[0012] In some embodiments, the boom assembly includes a first boom section and a boom section luffing mechanism for adjusting the pitch angle of the first boom section relative to the connecting frame, and the head of the connecting frame is provided with an upper connecting frame ear plate and a lower connecting frame ear plate spaced apart vertically.

[0013] The lower tail side of the short boom section and the lower tail side of the first long boom section are both hinged to the lower ear plate of the connecting frame. The luffing mechanism of the short boom section connects the upper tail side of the short boom section to the upper ear plate of the connecting frame, and the luffing mechanism of the long boom section connects the upper tail side of the first long boom section to the upper ear plate of the connecting frame.

[0014] A second aspect of this application provides a boom assembly, the boom assembly comprising:

[0015] Main arm; and

[0016] The auxiliary boom includes a connecting frame, a short boom assembly, and a long boom assembly. The tail of the connecting frame can be connected to the head of the main boom, and the tail of the short boom assembly is connected to the head of the connecting frame. The short boom assembly includes a short boom section and a short boom section luffing mechanism for adjusting the pitch angle of the short boom section relative to the connecting frame. The tail of the long boom assembly is detachably connected to the head of the connecting frame.

[0017] The auxiliary boom includes a switchable standby mode, a single-rate operating mode, and a multi-rate operating mode. In the standby mode, the auxiliary boom is located on one side of the main boom along its width direction, and is arranged in the opposite direction and parallel to the main boom. In the single-rate operating mode, the connecting frame and the long boom assembly remain connected, and the auxiliary boom is used as a single-rate auxiliary boom. In the multi-rate operating mode, the connecting frame and the long boom assembly are disconnected, and the interconnected connecting frame and the short boom assembly are used together as a multi-rate auxiliary boom.

[0018] In some embodiments, in the standby mode, the tail side of the connecting frame can form a single-point hinge with the head side of the main arm.

[0019] In some embodiments, the tail side of the connecting frame is provided with a tail ear plate, the tail ear plate of the connecting frame is provided with a first inner locking hole and a first outer hinge hole arranged at intervals along the width direction of the auxiliary arm, and the head side of the main arm is provided with a head ear plate of the main arm, the head ear plate of the main arm is provided with a second inner locking hole and a second outer hinge hole arranged at intervals along the width direction of the main arm.

[0020] In the standby mode, the first outer hinge hole and the second outer hinge hole can form a single-point hinge of the main and auxiliary arms; in the single-rate operating mode and the multi-rate operating mode, the first inner locking hole and the second inner locking hole are locked by a connecting piece.

[0021] In some embodiments, the auxiliary boom further includes a connecting frame locking structure disposed on the side of the connecting frame, and the main boom is provided with a main boom locking structure on its side; in the standby mode, the connecting frame and the main boom are mutually locked through the cooperation of a single connecting frame locking structure and a single main boom locking structure.

[0022] A third aspect of this application provides a crane that includes the boom assembly described above.

[0023] The auxiliary boom of this application, by simultaneously mounting a short boom assembly and a long boom assembly on a single connecting frame, allows the auxiliary boom to function as both a single-rate and multi-rate auxiliary boom, thus simultaneously possessing both single-rate and multi-rate operating modes. Furthermore, during use, simply disconnecting the connecting frame and the long boom assembly is sufficient to transform the auxiliary boom from a single-rate to a multi-rate auxiliary boom, making the switching between the two forms very convenient and improving operational efficiency. Compared to existing technologies, this application's auxiliary boom innovatively integrates the single-rate and multi-rate auxiliary booms into a single unit, requiring only one mounting position when installed on the main boom. This simplifies the overall structure of the boom assembly, helps save space occupied by the auxiliary boom, and reduces the overall manufacturing cost of the boom assembly.

[0024] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0026] Figure 1 This is a schematic diagram of a boom assembly in the prior art;

[0027] Figure 2 This is a top view of a boom assembly according to a specific embodiment of this application;

[0028] Figure 3 for Figure 1 A schematic diagram of the boom assembly during single-rate jib swing;

[0029] Figure 4 for Figure 3 A schematic diagram of the tail lug of the boom assembly's connecting frame;

[0030] Figure 5 for Figure 3 A schematic diagram of the single-rate auxiliary boom of the boom assembly in single-rate working mode;

[0031] Figure 6 for Figure 5 The main view of the single-rate auxiliary arm in single-rate operating mode;

[0032] Figure 7 for Figure 6 A schematic diagram of the single-rate secondary arm after amplitude variation;

[0033] Figure 8 This is a schematic diagram of a multi-rate auxiliary arm being pushed out in a specific embodiment of this application;

[0034] Figure 9 for Figure 8 A schematic diagram of the multi-rate auxiliary boom in multi-rate working mode;

[0035] Figure 10 for Figure 9 A schematic diagram of the multi-amplitude auxiliary arm after the amplitude change;

[0036] Figure 11 This is a schematic diagram illustrating the operation process of switching a secondary arm from standby mode to single-rate working mode in a specific embodiment of this application;

[0037] Figure 12 This is a schematic diagram of the luffing operation process of a single-rate auxiliary boom according to a specific embodiment of this application;

[0038] Figure 13 This is a schematic diagram illustrating the operation process of switching a secondary boom from standby mode to multi-rate working mode, as well as the luffing operation process of a multi-rate secondary boom, in a specific embodiment of this application.

[0039] Explanation of reference numerals in the attached figures

[0040] 1 main arm 2 auxiliary arms

[0041] 2a Single-rate auxiliary arm 2b Multiple-rate auxiliary arm

[0042] 21 Connecting frame 22 Short boom assembly

[0043] 23 Long boom assembly 211 Connecting frame tail lug

[0044] 212 Connecting bracket locking structure 213 Connecting bracket upper ear plate

[0045] 214 Connecting frame lower ear plate 221 Short arm section

[0046] 222 Short boom luffing mechanism 231 First long boom section

[0047] 232 Long boom luffing mechanism 211a First inner locking hole

[0048] 211b First external hinge hole

[0049] 3 First pin 4 Second pin

[0050] 5 Third pin 6 Fourth pin

[0051] 7 Fifth pin 8 Sixth pin

[0052] 9. Seventh pin 10. Eighth pin

[0053] 11 Ninth pin 12 Tenth pin

[0054] 13 Eleventh pin 14 Twelfth pin

[0055] 15 Thirteenth Pin Detailed Implementation

[0056] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0057] The following description, with reference to the accompanying drawings, describes the jib, boom assembly, and crane according to this application.

[0058] like Figures 2 to 10 As shown, the first exemplary embodiment of this application provides a secondary arm, which mainly includes a connecting frame 21, a short arm assembly 22, and a long arm assembly 23. The tail of the connecting frame 21 is used to connect to the head of the main arm 1, the tail of the short arm assembly 22 is connected to the head of the connecting frame 21, and the tail of the long arm assembly 23 is detachably connected to the head of the connecting frame 21.

[0059] Crucially, the auxiliary arm 2 in this exemplary embodiment includes a switchable single-rate operating mode and a multi-rate operating mode. In the single-rate operating mode, the connecting frame 21 and the long arm assembly 23 remain connected, and the auxiliary arm 2 is used as a single-rate auxiliary arm 2a. In the multi-rate operating mode, the connecting frame 21 and the long arm assembly 23 are disconnected, and the interconnected connecting frame 21 and the short arm assembly 22 are used together as a multi-rate auxiliary arm 2b.

[0060] Specifically, refer to Figure 6 and Figure 7 The front view shown illustrates that, in single-rate operating mode, the short boom assembly 22 can be entirely concealed within the long boom assembly 23 without interfering with its operation. See also... Figure 8 In multi-rate operating mode, the connecting frame 21 and the long boom assembly 23 are disconnected. At this time, the connecting frame 21 can separate from the long boom assembly 23 along with the short boom assembly 22, and act as... Figure 9 and Figure 10 The multiplier arm 2b shown is used.

[0061] In addition, see Figure 9 and Figure 10 The boom assembly 22 includes a boom section 221 and a boom section luffing mechanism 222. In use, the pitch angle of the boom section 221 relative to the connecting frame 21 can be adjusted by adjusting the state of the boom section luffing mechanism 222. Because the boom section 221 is relatively short, adjusting its pitch angle effectively prevents interference between the hook suspended on the boom section 221 and the main boom 1.

[0062] It should be noted that this exemplary embodiment does not limit the specific structure of the short boom luffing mechanism 222. Generally speaking, any mechanism capable of driving the short boom 221 to swing is acceptable, such as... Figure 9 and Figure 10 The variable amplitude plate mechanism shown can also be a telescopic cylinder, etc.

[0063] As can be seen, the auxiliary boom 2 of this exemplary embodiment, by simultaneously arranging the short boom assembly 22 and the long boom assembly 23 on a single connecting frame 21, allows the auxiliary boom 2 of this exemplary embodiment to function as both a single-rate auxiliary boom 2a and a multi-rate auxiliary boom 2b, thus simultaneously possessing both single-rate and multi-rate operating modes. Furthermore, during use, simply disconnecting the connecting frame 21 and the long boom assembly 23 is sufficient to transform the auxiliary boom 2 from a single-rate auxiliary boom 2a to a multi-rate auxiliary boom 2b, making the switching between the two forms very convenient and beneficial for improving operational efficiency. Compared with the prior art, the auxiliary boom 2 of this application innovatively integrates the single-rate and multi-rate auxiliary booms into one unit. When installed on the main boom 1, it only occupies one mounting position, simplifying the overall structure of the boom assembly, reducing the total weight of the auxiliary boom, and helping to save space occupied by the auxiliary boom 2 and reduce the overall manufacturing cost of the boom assembly.

[0064] Of course, in addition to the single-rate and multi-rate operating modes, the secondary arm 2 also includes a standby mode when not in operation. See Figure 2 In standby mode, the auxiliary arm 2 is arranged in the opposite direction and parallel to the main arm 1. At this time, the auxiliary arm 2 is located on the side of the main arm 1, and the tail of the auxiliary arm 2 is aligned with the head of the main arm 1. The tail side of the connecting frame 21 can form a single-point hinge with the head side of the main arm 1.

[0065] Specifically, see Figure 3 and Figure 4 The rear side of the connecting frame 21 is provided with a connecting frame tail ear plate 211. The connecting frame tail ear plate 211 has a first inner locking hole 211a and a first outer hinge hole 211b arranged at intervals along the width direction of the auxiliary arm. The connecting frame 21 can form a single-point hinge with the head side of the main arm 1 through the first outer hinge hole 211b. In the case of forming a single-point hinge with the main arm, such as... Figure 5 As shown, the auxiliary boom 2 can swing around the hinge point. In other words, by forming a single-point hinge between the tail side of the connecting frame 21 and the head side of the main boom 1, the auxiliary boom 2 can switch from standby mode to single-rate working mode or multi-rate working mode at any time according to actual usage needs. The switching process is very convenient and has good continuity, which can help improve work efficiency.

[0066] Furthermore, when the auxiliary boom 2 swings to its tail (i.e., the tail of the connecting frame 21) fully aligns with the head of the main boom 1 (e.g.) Figure 5 As shown), the auxiliary arm 2 can be locked to the head of the main arm 1 through the first inner locking hole 211a.

[0067] In an optional or preferred embodiment, see Figure 3The auxiliary boom 2 also includes a connecting frame locking structure 212 disposed on the side of the connecting frame 21. In standby mode, the connecting frame 21 can be locked to the main boom 1 through a single connecting frame locking structure 212, thereby improving the stability of the auxiliary boom 2. Furthermore, when the auxiliary boom 2 switches from standby mode to multi-rate operating mode, the connection between the connecting frame 21 and the long boom assembly 23 can be disconnected first. Only after ensuring safety can the connection between the connecting frame locking structure 212 and the main boom 1 be disconnected, thus ensuring the stability and safety of the multi-rate auxiliary boom 2b's movement. Of course, in actual use, under safe conditions, the connection between the connecting frame locking structure 212 and the main boom 1, and the connection between the connecting frame 21 and the long boom assembly 23, can be disconnected sequentially or simultaneously; this embodiment does not limit this.

[0068] In an optional or preferred embodiment, see Figure 6 and Figure 7 The long boom assembly 23 includes a first long boom section 231 and a long boom section luffing mechanism 232 for adjusting the pitch angle of the first long boom section 231 relative to the connecting frame 21. The head of the connecting frame 21 is provided with an upper connecting frame ear plate 213 and a lower connecting frame ear plate 214 spaced apart vertically. The lower tail side of the short boom section 221 and the lower tail side of the first long boom section 231 are both hinged to the lower connecting frame ear plate 214. The short boom section luffing mechanism 222 connects the upper tail side of the short boom section 221 and the upper connecting frame ear plate 213. The long boom section luffing mechanism 232 connects the upper tail side of the first long boom section 231 and the upper connecting frame ear plate 213.

[0069] As can be seen, by setting the upper ear plate 213 and the lower ear plate 214 of the connecting frame 21 at the head of the connecting frame 21, the long boom assembly 23 and the short boom section 221 can be installed simultaneously at the head of the connecting frame 21. It is understood that in this embodiment, when it is necessary to disconnect the connection between the long boom assembly 23 and the connecting frame 21 so that the auxiliary boom 2 forms a multi-ratio auxiliary boom 2b, it is equivalent to disconnecting the connection between the long boom section luffing mechanism 232 and the upper ear plate 213 of the connecting frame, and disconnecting the connection between the lower tail side of the first long boom section 231 and the lower ear plate 214 of the connecting frame, thereby separating the connecting frame 21 entirely from the long boom assembly 23.

[0070] It should be noted that, in this embodiment, the directional terms "up" and "down" specifically refer to locations such as... Figure 6 and Figure 9 The vertical direction of the secondary arm 2 in a specific state is shown.

[0071] Furthermore, this embodiment does not limit the specific structure of the long boom luffing mechanism 232. Generally speaking, any mechanism capable of driving the first long boom 231 to swing is acceptable, such as... Figure 6 and Figure 7The luffing plate mechanism shown can also be a telescopic cylinder, etc. Furthermore, the long boom assembly 23 in this embodiment may include multiple long boom sections, such as a second long boom section, a third long boom section, etc., but this embodiment is not limited to this. Taking the inclusion of a second long boom section as an example, refer to... Figure 5 The second long arm segment can be located on the lateral outer side of the first long arm segment 231.

[0072] A second exemplary embodiment of this application provides a boom assembly including a main boom 1 and the aforementioned auxiliary boom 2. Therefore, the various embodiments of the boom assembly described below can obviously also obtain the technical effects brought about by the corresponding embodiments of the auxiliary boom 2. Thus, for the various embodiments mentioned below, only the additional technical effects brought about by their structural features are described, and the technical effects already described above are not repeated.

[0073] Specifically, such as Figures 2 to 10 As shown, the auxiliary boom 2 includes a connecting frame 21, a short boom assembly 22, and a long boom assembly 23. The tail of the connecting frame 21 can be connected to the head of the main boom 1. The tail of the short boom assembly 22 is connected to the head of the connecting frame 21. The short boom assembly 22 includes a short boom section 221 and a short boom section luffing mechanism 222 for adjusting the pitch angle of the short boom section 221 relative to the connecting frame 21. The tail of the long boom assembly 23 is detachably connected to the head of the connecting frame 21.

[0074] The auxiliary boom 2 includes switchable standby mode, single-rate operating mode, and multi-rate operating mode. In standby mode, the auxiliary boom 2 is located on one side of the main boom 1 along the width direction of the main boom 1, and is arranged in the opposite direction and parallel to the main boom 1. In single-rate operating mode, the connecting frame 21 and the long boom assembly 23 remain connected, and the auxiliary boom 2 is used as a single-rate auxiliary boom 2a. In multi-rate operating mode, the connecting frame 21 and the long boom assembly 23 are disconnected, and the interconnected connecting frame 21 and the short boom assembly 22 are used together as a multi-rate auxiliary boom 2b.

[0075] In an optional or preferred embodiment, see Figure 2 In standby mode, the tail side of the connecting frame 21 can form a single-point hinge with the head side of the main arm 1.

[0076] Further, see Figures 3 to 5 The tail side of the connecting frame 21 is provided with a tail ear plate 211. The tail ear plate 211 is provided with a first inner locking hole 211a and a first outer hinge hole 211b arranged at intervals along the width direction of the auxiliary arm. Correspondingly, the head side of the main arm 1 is provided with a head ear plate. The head ear plate is provided with a second inner locking hole and a second outer hinge hole arranged at intervals along the width direction of the main arm.

[0077] Therefore, in standby mode, a single-point hinge between the main and auxiliary arms can be formed by connecting the first outer hinge hole 211b and the second outer hinge hole with the connecting piece. In single-rate and multi-rate operating modes, the connecting frame 21 can be locked at the head of the main arm 1 by connecting the first inner locking hole 211a and the second inner locking hole with the connecting piece, that is, locking the single-rate auxiliary arm 2a or the multi-rate auxiliary arm 2b to ensure stable operation of the auxiliary arm.

[0078] In an optional or preferred embodiment, see Figure 3 The auxiliary boom 2 also includes a connecting frame locking structure 212 disposed on the side of the connecting frame 21, and correspondingly, the main boom 1 is provided with a main boom locking structure on its side. In standby mode, the connecting frame 21 and the main boom 1 are mutually locked through the cooperation of a single connecting frame locking structure 212 and a single main boom locking structure.

[0079] In an optional or preferred embodiment, see Figures 11 to 13 The boom assembly also includes a first pin 3, a second pin 4, a third pin 5, a fourth pin 6, a fifth pin 7, a sixth pin 8, a seventh pin 9, an eighth pin 10, a ninth pin 11, a tenth pin 12, an eleventh pin 13, a twelfth pin 14, and a thirteenth pin 15.

[0080] The following is a brief description of the usage process of the boom assembly in this application.

[0081] First, refer to Figure 11 This section describes the steps for switching the auxiliary boom 2 from standby mode to single-rate operating mode.

[0082] Step 1: As Figure 11 As shown in -a, insert the first pin 3 to connect the first outer hinge hole 211b and the second outer hinge hole, so that the tail side of the connecting frame 21 and the head side of the main arm 1 form a single-point hinge of the main and auxiliary arms, and pull out the second pin 4, the third pin 5 and the fourth pin 6.

[0083] Step Two: As Figure 11 As shown in -b, the single-rate auxiliary arm 2a is pushed to rotate around the first pin 3 to the front of the head of the main arm 1;

[0084] Step 3: As Figure 11 As shown in -c, the fifth pin 7 is inserted to connect the first inner locking hole 211a and the second inner locking hole, and the sixth pin 8 is inserted to connect the third inner locking hole and the fourth inner locking hole, thereby locking the connecting frame 21 and the main arm 1, so that the single-rate auxiliary arm 2a is in the single-rate working mode.

[0085] The following continues to refer to Figure 12 Describe the luffing operation steps of the single-rate secondary arm 2a.

[0086] Step 1: As Figure 12As shown in -a, pull out the seventh pin 9;

[0087] Step Two: As Figure 12 As shown in -b, the first long arm section 231 of the single-rate auxiliary arm 2a is pushed, causing the first long arm section 231 to swing around the eighth pin 10 to a preset pitch angle, thereby completing the amplitude change of the single-rate auxiliary arm 2a.

[0088] Then, refer to Figure 13 This section describes the steps for switching the auxiliary boom 2 from standby mode to multi-rate working mode.

[0089] Step 1: As Figure 13 -a and Figure 13 As shown in -b, insert the first pin 3 to connect the first outer hinge hole 211b and the second outer hinge hole, so that the tail side of the connecting frame 21 and the head side of the main arm 1 form a single-point hinge of the main and auxiliary arms. Then pull out the ninth pin 11 and the tenth pin 12. After ensuring stability, pull out the fourth pin 6.

[0090] Step Two: As Figure 13 As shown in -c, the first arm segment of the main arm 1 is extended, which drives the multi-amplitude auxiliary arm 2b away from the long arm group 23 to maintain a certain distance, so as to prevent the short arm group 22 from interfering with the long arm group 23 when it rotates in subsequent steps.

[0091] Step 3: As Figure 13 As shown in -d, the multi-rate auxiliary arm 2b is pushed to rotate around the first pin 3 to the front of the head of the main arm 1;

[0092] Step 4: Insert the fifth pin 7 to connect the first inner locking hole 211a and the second inner locking hole, and insert the sixth pin 8 to connect the third inner locking hole and the fourth inner locking hole, thereby locking the connecting frame 21 and the main arm 1, so that the multi-rate auxiliary arm 2b is in the multi-rate working mode.

[0093] Finally, continue to refer to Figure 13 -d and Figure 13 -e describes the luffing operation steps of the multi-rate secondary arm 2b.

[0094] Step 1: As Figure 13 As shown in -d, pull out the twelfth pin 14;

[0095] Step Two: As Figure 13 As shown in -e, the short arm section 221 of the multi-range auxiliary arm 2a is pushed, causing the short arm section 221 to swing around the thirteenth pin 15 to a preset pitch angle, thereby completing the luffing of the multi-range auxiliary arm 2b.

[0096] The third exemplary embodiment of this application provides a crane that includes the boom assembly described above. Accordingly, the crane has all the technical effects brought about by the boom assembly described above, and therefore will not be described again here.

[0097] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0098] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0099] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0100] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A secondary arm, characterized in that, The secondary arm (2) includes: A connecting frame (21), the tail of which is used to connect to the head of the main arm (1); A boom assembly (22), the tail of which is connected to the head of the connecting frame (21), the boom assembly (22) including a boom section (221) and a boom section luffing mechanism (222) for adjusting the pitch angle of the boom section (221) relative to the connecting frame (21); and Long arm assembly (23), the tail of which is detachably connected to the head of the connecting frame (21); The auxiliary arm (2) includes a switchable single-rate operating mode and a multi-rate operating mode. In the single-rate operating mode, the connecting frame (21) and the long arm assembly (23) remain connected, and the auxiliary arm (2) is used as a single-rate auxiliary arm (2a). In the multi-rate operating mode, the connecting frame (21) and the long arm assembly (23) are disconnected, and the interconnected connecting frame (21) and the short arm assembly (22) are used together as a multi-rate auxiliary arm (2b). The tail side of the connecting frame (21) is provided with a tail ear plate (211). The tail ear plate (211) is provided with a first inner locking hole (211a) and a first outer hinge hole (211b) arranged at intervals along the width direction of the auxiliary arm. The first outer hinge hole (211b) is used to form a single-point hinge of the main and auxiliary arms. The auxiliary arm (2) also includes a connecting frame locking structure (212) disposed on the side of the connecting frame (21). In standby mode, the connecting frame (21) can be locked to the main arm (1) by a single connecting frame locking structure (212). The auxiliary arm (2) can be either a single-rate auxiliary arm (2a) or a multi-rate auxiliary arm (2b) by simultaneously setting the short arm group (22) and the long arm group (23) on a single connecting frame (21).

2. The auxiliary arm according to claim 1, characterized in that, The auxiliary arm (2) also includes a standby mode; in the standby mode, the auxiliary arm (2) is arranged in the opposite direction and parallel to the main arm (1), and the tail side of the connecting frame (21) can form a single-point hinge with the head side of the main arm (1).

3. The auxiliary arm according to any one of claims 1 or 2, characterized in that, The long arm assembly (23) includes a first long arm section (231) and a long arm section luffing mechanism (232) for adjusting the pitch angle of the first long arm section (231) relative to the connecting frame (21). The head of the connecting frame (21) is provided with an upper connecting frame ear plate (213) and a lower connecting frame ear plate (214) spaced apart vertically. The lower tail of the short boom section (221) and the lower tail of the first long boom section (231) are both hinged to the lower ear plate (214) of the connecting frame. The luffing mechanism (222) of the short boom section connects the upper tail of the short boom section (221) to the upper ear plate (213) of the connecting frame. The luffing mechanism (232) of the long boom section connects the upper tail of the first long boom section (231) to the upper ear plate (213) of the connecting frame.

4. A boom assembly, characterized in that, The boom assembly includes: Main arm (1); and The auxiliary boom (2) includes a connecting frame (21), a short boom assembly (22) and a long boom assembly (23). The tail of the connecting frame (21) can be connected to the head of the main boom (1). The tail of the short boom assembly (22) is connected to the head of the connecting frame (21). The short boom assembly (22) includes a short boom section (221) and a short boom section luffing mechanism (222) for adjusting the pitch angle of the short boom section (221) relative to the connecting frame (21). The tail of the long boom assembly (23) is detachably connected to the head of the connecting frame (21). The auxiliary arm (2) includes a switchable standby mode, a single-rate operating mode, and a multi-rate operating mode. In the standby mode, the auxiliary arm (2) is located on one side of the main arm (1) along the width direction of the main arm, and the auxiliary arm (2) is arranged in the opposite direction and parallel to the main arm (1). In the single-rate operating mode, the connecting frame (21) and the long arm group (23) remain connected, and the auxiliary arm (2) is used as a single-rate auxiliary arm (2a). In the multi-rate operating mode, the connecting frame (21) and the long arm group (23) are disconnected, and the connecting frame (21) and the short arm group (22) are used together as a multi-rate auxiliary arm (2b).

5. The boom assembly according to claim 4, characterized in that, In the standby mode, the tail side of the connecting frame (21) can form a single-point hinge with the head side of the main arm (1).

6. The boom assembly according to claim 5, characterized in that, The tail side of the connecting frame (21) is provided with a tail ear plate (211), and the tail ear plate (211) is provided with a first inner locking hole (211a) and a first outer hinge hole (211b) arranged at intervals along the width direction of the auxiliary arm. The head side of the main arm (1) is provided with a head ear plate, and the head ear plate is provided with a second inner locking hole and a second outer hinge hole arranged at intervals along the width direction of the main arm. In the standby mode, the first external hinge hole (211b) and the second external hinge hole can form a single-point hinge of the main and auxiliary arms; In both the single-rate operating mode and the multi-rate operating mode, the first inner locking hole (211a) and the second inner locking hole are locked by a connecting piece.

7. The boom assembly according to claim 5, characterized in that, The auxiliary arm (2) also includes a connecting frame locking structure (212) disposed on the side of the connecting frame (21), and the main arm (1) is provided with a main arm locking structure on its side; in the standby mode, the connecting frame (21) and the main arm (1) are mutually locked by the cooperation of a single connecting frame locking structure (212) and a single main arm locking structure.

8. A crane, characterized in that, The crane includes a boom assembly according to any one of claims 4 to 7.

Images