Counter arm connection device, jib and engineering machine

Abstract

This application relates to the field of engineering machinery technology, and discloses a boom connecting device, a crane boom, and engineering machinery, including a first sleeve, a first sliding rod, a second sleeve, a second sliding rod, a telescopic member, and a limiting structure. The first sleeve is adapted to connect with a first connecting seat on the main boom, and the first sliding rod is slidably connected to the first sleeve. The second sleeve is adapted to connect with a second connecting seat on the main boom. The second sliding rod is slidably connected to the first sleeve. The telescopic member has a main body and a telescopic part, and is located between the first sleeve and the second sleeve. The first sliding rod is connected to the end of the telescopic part away from the main body, and the second sliding rod is connected to the end of the main body away from the telescopic part. The limiting structure is provided on the telescopic member and is used to enable or restrict the telescopic part from retracting. Using the boom connecting device of this application, when connecting the main boom and the boom, the manual insertion and removal of pins is replaced by driving the telescopic part of the telescopic member to extend and retract, reducing the difficulty of manual operation.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, specifically to a boom connecting device, a boom, and engineering machinery. Background Technology

[0002] For construction machinery, especially cranes, lifting materials is a crucial operation. This lifting action is typically achieved through the boom. To achieve a high lifting stroke and facilitate transportation, the boom usually consists of a detachable main boom and a secondary boom. The main boom has at least one set of connecting seats, and the secondary boom has at least one set of corresponding connecting heads. Each connecting seat has through holes, and each connecting head has insertion holes. After aligning the through holes on the connecting seats with the insertion holes on the connecting heads, pins are inserted to secure the connection, thus connecting the main boom and the secondary boom.

[0003] However, due to the large weight of the auxiliary arm, it is difficult to precisely align the perforation on the connector with the insertion hole on the connector head, making it difficult to manually insert the pin.

[0004] Therefore, how to solve or improve the problem of the difficulty in manually inserting pins when connecting the main boom and auxiliary boom of a crane in related technologies has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, this application provides a jib connection device, a crane boom, and engineering machinery to solve or improve the problem of the difficulty in manually inserting pins when connecting the main boom and the jib of a crane boom.

[0006] In a first aspect, this application provides a secondary arm connecting device, comprising:

[0007] The first sleeve is adapted to be connected to the first connecting seat on the main arm and aligned with the first through hole on the first connecting seat;

[0008] The first sliding rod is slidably connected to the first sleeve and can pass through the first through hole;

[0009] The second sleeve is adapted to connect to the second connecting seat on the main arm and to align with the second through hole on the second connecting seat;

[0010] The second slide rod is slidably connected to the first sleeve and can pass through the second through hole;

[0011] A telescopic component has a main body and a telescopic part connected to each other. The main body can drive the telescopic part to extend and retract. The telescopic component is located between a first sleeve and a second sleeve. A first sliding rod is connected to the end of the telescopic part away from the main body, and a second sliding rod is connected to the end of the main body away from the telescopic part.

[0012] A limiting structure is provided on the telescopic member and is adapted to switch between a locked state and an unlocked state. When the telescopic member is in the unlocked state, the telescopic part can retract; when the telescopic member is in the locked state, the retraction of the telescopic part is restricted.

[0013] Optionally, the limiting structure includes:

[0014] The flip-up component is rotatably connected to the first slide bar.

[0015] When the telescopic part is extended, the flipping member can be flipped to be positioned along the retraction direction of the telescopic part, and can be limited and engaged with the main body in the retraction direction of the telescopic part, so that the flipping member switches to the locked state;

[0016] When the flipping component flips to a position that deviates from the retraction direction of the telescopic part, the flipping component switches to the unlocked state.

[0017] Optionally, the first slide bar is provided with a rotating shaft, the flipping part is provided with a waist-shaped hole and a snap-fit ​​groove, the rotating shaft is inserted into the waist-shaped hole, and the first sleeve is provided with a snap-fit ​​protrusion;

[0018] When the flipping component is flipped to be positioned along the retraction direction of the telescopic part, the length directions of the waist-shaped hole and the snap-fit ​​groove are both consistent with the retraction direction of the telescopic part, and the opening of the snap-fit ​​groove points to the snap-fit ​​protrusion.

[0019] Optionally, the flipping member is provided with a stop, and when the flipping member is flipped to be positioned in the retraction direction along the telescopic part, the stop and the snap-fit ​​protrusion are limited and engaged in the flipping direction of the flipping member.

[0020] Optionally, the first slide bar is provided with a first limiting part, and the first sleeve is provided with a first restricting part. In the direction in which the first slide bar moves away from the second sleeve, the first limiting part can cooperate with the first restricting part for limiting.

[0021] Optionally, the first slide bar is provided with a second limiting part, which can cooperate with the first limiting part to limit movement in the direction in which the first slide bar moves closer to the second sleeve.

[0022] Optionally, the second sleeve is provided with a third limiting part, and the second slide rod is provided with a second limiting part. In the direction in which the second slide rod moves close to the first sleeve, the third limiting part can cooperate with the second limiting part for limiting.

[0023] Optionally, the second sleeve is provided with a fourth limiting part, which can cooperate with the second limiting part to limit movement in the direction in which the second slide rod moves away from the first sleeve.

[0024] Secondly, this application also provides a lifting boom, comprising:

[0025] The main arm is provided with a first connecting seat and a second connecting seat. The first connecting seat has a first through hole, and the second connecting seat has a second through hole.

[0026] The auxiliary arm is provided with a first connector and a second connector. The first connector has a first socket and the second connector has a second socket.

[0027] In any of the above-described auxiliary arm connecting devices, when the first insertion hole is aligned with the first through hole, the first slide rod can be inserted into the first insertion hole while passing through the first through hole; when the second insertion hole is aligned with the second through hole, the second slide rod can be inserted into the second insertion hole while passing through the second through hole.

[0028] Secondly, this application also provides an engineering machinery, including any of the above-described auxiliary boom connecting devices or lifting booms.

[0029] This application provides a secondary boom connecting device. A first sleeve is adapted to connect to a first connecting seat on the main boom and is aligned with a first through hole on the first connecting seat. A first sliding rod is slidably connected to the first sleeve and can pass through the first through hole. A second sleeve is adapted to connect to a second connecting seat on the main boom and is aligned with a second through hole on the second connecting seat. A second sliding rod is slidably connected to the first sleeve and can pass through the second through hole. A telescopic member has a main body and a telescopic part connected to each other. The main body can drive the telescopic part to extend and retract. The telescopic member is located between the first sleeve and the second sleeve. The first sliding rod is connected to the end of the telescopic part away from the main body, and the second sliding rod is connected to the end of the main body away from the telescopic part. A limiting structure is provided on the telescopic member and is adapted to switch between a locked state and an unlocked state. When the telescopic member is in the unlocked state, the telescopic part can retract; when the telescopic member is in the locked state, the retraction of the telescopic part is restricted.

[0030] For the connection between the main arm and the auxiliary arm, connect the first sleeve to the first connecting seat on the main arm, aligning the inner hole of the first sleeve with the first through hole on the first connecting seat. Connect the second sleeve to the second connecting seat on the main arm, aligning the inner hole of the second sleeve with the second through hole on the second connecting seat. Then align the first insertion hole on the auxiliary arm with the first through hole, and align the second insertion hole on the auxiliary arm with the second through hole. Next, drive the telescopic part of the telescopic component to extend, causing the first slide rod and the second slide rod to move away from each other, so that the first slide rod passes through the first through hole and inserts into the first insertion hole, and the second slide rod passes through the second through hole and inserts into the second insertion hole. Switch the limiting structure to the locked state to restrict the retraction of the telescopic part and prevent the first and second slide rods from coming out. When the auxiliary arm needs to be disassembled, switch the limiting structure to the unlocked state, and then drive the telescopic part of the telescopic component to retract, causing the first slide rod to leave the first insertion hole and the second slide rod to leave the second insertion hole, thus allowing the auxiliary arm to be disassembled.

[0031] In this way, by using the auxiliary boom connecting device of this application, when connecting the main boom and the auxiliary boom, the manual insertion and removal of the pins is replaced by driving the telescopic part of the telescopic component to extend and retract, which reduces the difficulty of manual operation. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the telescopic part of the auxiliary arm connecting device in an embodiment of this application when it is retracted;

[0034] Figure 2 This is a schematic diagram of the structure of the telescopic part of the auxiliary arm connecting device when it is extended, according to an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the first sleeve structure of a secondary arm connecting device according to an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of the first slide bar structure of a secondary arm connecting device according to an embodiment of this application;

[0037] Figure 5 This is a schematic diagram of the second sleeve structure of a secondary arm connecting device according to an embodiment of this application;

[0038] Figure 6 This is a schematic diagram of the second slide bar structure of a secondary arm connecting device according to an embodiment of this application;

[0039] Figure 7 This is a schematic diagram of the main boom structure of a crane boom according to an embodiment of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. First sleeve; 11. Snap-fit ​​protrusion; 12. First restricted part; 2. First slide rod; 21. Rotating shaft; 22. First limiting part; 23. Second limiting part; 3. Second sleeve; 31. Third limiting part; 32. Fourth limiting part; 4. Second slide rod; 41. Second restricted part; 5. Telescopic component; 51. Main body; 52. Telescopic component; 6. Flipping component; 61. Waist-shaped hole; 62. Snap-fit ​​groove; 63. Side guard; 7. Main arm; 71. First connecting seat; 711. First through hole; 72. Second connecting seat; 721. Second through hole. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] The following is combined Figures 1 to 7 This describes an embodiment of the present application.

[0044] A set of connecting seats provided on the main arm 7 includes a first connecting seat 71 and a second connecting seat 72. The first connecting seat 71 has a first through hole 711, and the second connecting seat 72 has a second through hole 721. A set of connecting heads provided on the auxiliary arm includes a first connecting head and a second connecting head. The first connecting head has a first insertion hole, and the second connecting head has a second insertion hole.

[0045] If it is necessary to connect the auxiliary arm to the main arm 7, the first through hole 711 and the first insertion hole need to be aligned and a pin inserted, and the second through hole 721 and the second insertion hole need to be aligned and a pin inserted.

[0046] According to embodiments of this application, in one aspect, a secondary arm connecting device is provided, such as... Figure 1 and Figure 2 As shown, it includes a first sleeve 1, a first slide rod 2, a second sleeve 3, a second slide rod 4, a telescopic component 5, and a limiting structure.

[0047] The first sleeve 1 is used to connect with the first connecting seat 71 on the main arm 7, and after the first sleeve 1 is connected with the first connecting seat 71 on the main arm 7, the inner hole of the first sleeve 1 is aligned with the first through hole 711 on the first connecting seat 71.

[0048] The first slide rod 2 is partially inserted into the inner hole of the first sleeve 1, so that the first slide rod 2 is slidably connected to the first sleeve 1, and the first slide rod 2 can slide along the inner hole of the first sleeve 1. Since the inner hole of the first sleeve 1 is aligned with the first through hole 711 on the first connecting seat 71, the first slide rod 2 can pass through the first through hole 711 when it slides.

[0049] The second sleeve 3 is used to connect with the second connecting seat 72 on the main arm 7, and after the second sleeve 3 is connected with the second connecting seat 72 on the main arm 7, the inner hole of the second sleeve 3 is aligned with the second through hole 721 on the second connecting seat 72.

[0050] The second slide rod 4 is partially inserted into the inner hole of the second sleeve 3, so that the second slide rod 4 is slidably connected to the second sleeve 3 and can slide along the inner hole of the second sleeve 3. Since the inner hole of the second sleeve 3 is aligned with the second through hole 721 on the second connecting seat 72, the second slide rod 4 can pass through the second through hole 721 when it slides.

[0051] The telescopic member 5 has a main body 51 and a telescopic part 52, wherein the telescopic part 52 is connected to the main body 51, the end of the telescopic part 52 away from the main body 51 is the telescopic end of the telescopic member 5, and the end of the main body 51 away from the telescopic part 52 is the fixed end of the telescopic member 5. The main body 51 can drive the telescopic part 52 to extend and retract.

[0052] The telescopic component 5 is disposed between the first sleeve 1 and the second sleeve 3. The first sliding rod 2 is connected to the end of the telescopic part 52 away from the main body 51, and the second sliding rod 4 is connected to the end of the main body 51 away from the telescopic part 52. Thus, when the main body 51 drives the telescopic part 52 to extend, the first sliding rod 2 and the second sliding rod 4 move away from each other, so that the first sliding rod 2 slides along the first sleeve 1 and passes through the first through hole 711, and the second sliding rod 4 slides along the second sleeve 3 and passes through the second through hole 721.

[0053] A limiting structure is provided on the telescopic member 5 and can switch between a locked state and an unlocked state. When the limiting structure is switched to the unlocked state, the telescopic member 52 can retract normally. When the limiting structure is switched to the locked state, the telescopic member 52 is restricted from retracting under the limiting action of the limiting structure.

[0054] For the connection between the main arm 7 and the auxiliary arm, such as Figure 2 As shown, the first sleeve 1 is connected to the first connecting seat 71 on the main arm 7, so that the inner hole of the first sleeve 1 is aligned with the first through hole 711 on the first connecting seat 71. The second sleeve 3 is connected to the second connecting seat 72 on the main arm 7, so that the inner hole of the second sleeve 3 is aligned with the second through hole 721 on the second connecting seat 72.

[0055] Then, align the first insertion hole on the auxiliary arm with the first through hole 711, and align the second insertion hole on the auxiliary arm with the second through hole 721. Then, drive the telescopic part 52 of the telescopic member 5 to extend, so that the first slide rod 2 and the second slide rod 4 move away from each other, thereby causing the first slide rod 2 to pass through the first through hole 711 and be inserted into the first insertion hole, and the second slide rod 4 to pass through the second through hole 721 and be inserted into the second insertion hole.

[0056] Switch the limiting structure to the locked state to restrict the retraction of the telescopic part 52 and prevent the first slide bar 2 and the second slide bar 4 from coming off.

[0057] At this point, the first slide bar 2 and the second slide bar 4 can serve as pins connecting the main boom 7 and the auxiliary boom, thus connecting the auxiliary boom to the main boom 7.

[0058] On the part where the auxiliary arm needs to be disassembled, such as Figure 1 As shown, the limiting structure is switched to the unlocked state, and then the telescopic part 52 of the telescopic component 5 is driven to retract, so that the first slide rod 2 leaves the first insertion hole and the second slide rod 4 leaves the second insertion hole, and the auxiliary arm can be removed.

[0059] In this way, by using the auxiliary boom connecting device of this application, when connecting the main boom 7 and the auxiliary boom, the manual insertion and removal of the pin is replaced by driving the telescopic part 52 of the telescopic member 5 to extend and retract, which reduces the difficulty of manual operation.

[0060] The telescopic component 5 can be an electric pole, a hydraulic cylinder, or a pneumatic cylinder, etc.

[0061] As an optional embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, the limiting structure includes a flipping member 6. The flipping member 6 is flipped to the first slide rod 2, so that the flipping member 6 can flip relative to the first slide rod 2, so that the flipping member 6 can be flipped to be set along the retraction direction of the telescopic part 52 or deviate from the retraction direction of the telescopic part 52.

[0062] After the telescopic part 52 of the drive telescopic member 5 extends, when the flipping member 6 is flipped to be set in the retraction direction of the telescopic part 52, the main body 51 is limited to cooperate with the flipping member 6 in the retraction direction of the telescopic part 52, and at this time the flipping member 6 is switched to the locked state.

[0063] Specifically, when the flipping member 6 is positioned along the retraction direction of the telescopic portion 52, if the telescopic portion 52 retracts, the flipping member 6 will move along the retraction direction of the telescopic portion 52. However, since the main body 51 is engaged with the flipping member 6 in the retraction direction of the telescopic portion 52, the flipping member 6 is resisted by the main body 51 in the retraction direction of the telescopic portion 52, preventing the flipping member 6 from moving along the retraction direction of the telescopic portion 52, thereby restricting the retraction of the telescopic portion 52.

[0064] When the flipping member 6 is flipped to a position that deviates from the retraction direction of the telescopic part 52, the main body 51 no longer engages with the flipping member 6 in the retraction direction of the telescopic part 52, allowing the flipping member 6 to move along the retraction direction of the telescopic part 52, thereby enabling the telescopic part 52 to retract without restriction.

[0065] A rotating hole can be made on the flipping part 6, and a rotating shaft 21 can be set on the first slide rod 2. The rotating shaft 21 is inserted into the rotating hole, so that the flipping part 6 and the rotating shaft 21 are flipped and connected.

[0066] In optional embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the flipping member 6 has a first end and a second end that are arranged opposite to each other. When the flipping member 6 is flipped to be arranged in the retraction direction along the telescopic part 52, the main body 51 is limited and cooperates with the first end of the flipping member 6 in the retraction direction of the telescopic part 52.

[0067] A rotating shaft 21 is provided on the first sliding rod 2. A waist-shaped hole 61 and a snap-fit ​​groove 62 are provided on the flipping member 6. The waist-shaped hole 61 is located between the first end and the second end of the flipping member 6, and the opening of the snap-fit ​​groove 62 extends out of the second end of the flipping member 6. The rotating shaft 21 is inserted into the waist-shaped hole 61, so that the flipping member 6 is flipped and connected to the rotating shaft 21, and the flipping member 6 and the first sliding rod 2 can slide relative to each other along the extension direction of the waist-shaped hole 61.

[0068] The first sleeve 1 is provided with a snap-fit ​​protrusion 11. When the flipping part 6 is flipped to be set in the retraction direction of the telescopic part 52, the length direction of the waist-shaped hole and the snap-fit ​​groove 62 are consistent with the retraction direction of the telescopic part 52, so that the first end of the flipping part 6 points to the main body 51 of the telescopic part 5, the second end of the flipping part 6 points to the snap-fit ​​protrusion 11, and the groove opening of the snap-fit ​​groove 62 points to the snap-fit ​​protrusion 11.

[0069] At this time, the flipping part 6 is slid relative to the first slide bar 2 and close to the locking protrusion 11, so that the locking protrusion 11 is locked into the locking groove 62. Under the limiting action of the inner wall of the locking groove 62, the flipping part 6 is restricted from flipping, thereby preventing the flipping part 6 from switching to the unlocked state.

[0070] When it is necessary to drive the telescopic part 52 to retract, the flipping part 6 is first slid relative to the first slide rod 2 close to the main body 51, so that the locking protrusion 11 leaves the locking groove 62, and the flipping part 6 is no longer restricted and can flip. When the flipping part 6 is flipped to a position that deviates from the retraction direction of the telescopic part 52, the main body 51 is no longer limited to the flipping part 6 in the retraction direction of the telescopic part 52, so that the flipping part 6 can move along the retraction direction of the telescopic part 52, thereby making the telescopic part 52 no longer restricted and able to retract.

[0071] This configuration allows the flip-up component 6 to be restricted from switching to the unlocked state by engaging the locking protrusion 11 with the locking groove 62 when the flip-up component 6 is switched to the locked state, thus preventing the flip-up component 6 from switching to the unlocked state and causing its locking function to fail.

[0072] In some embodiments, the telescopic member 5 is vertically arranged, that is, the retraction direction of the telescopic part 52 is vertically upward. The engaging protrusion 11 is located below the main body 51. In this way, when the flipping member 6 is flipped to be arranged along the retraction direction of the telescopic part 52, the flipping member 6 moves downward under its own weight and approaches the engaging protrusion 11, so that the engaging protrusion 11 engages with the engaging groove 62, making the operation more convenient.

[0073] In a further embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, a stop 63 is provided on the flipping member 6. When the flipping member 6 is flipped to the retraction direction along the telescopic part 52, the stop 63 engages with the locking protrusion 11 in the flipping direction of the flipping member 6. This restricts the flipping member 6 from continuing to flip, allowing the flipping member 6 to move downward smoothly under its own weight, making operation more convenient.

[0074] As an optional embodiment, such as Figure 3 and Figure 4 As shown, a first limiting part 22 is provided on the first slide rod 2, and a first restricting part 12 is provided on the first sleeve 1. In the direction in which the first slide rod 2 moves away from the second sleeve 3, the first limiting part 22 can cooperate with the first restricting part 12 for limiting.

[0075] When the telescopic part 52 extends, the first slide rod 2 moves away from the second sleeve 3, causing the first restricted part 12 to move closer to the first limiting part 22 until the first slide rod 2 passes through the first through hole 711 and is inserted into the first insertion hole. At this point, the first restricted part 12 is exactly abutted against the first limiting part 22 and locked in place. Thus, the first slide rod 2 can no longer move away from the second sleeve 3, that is, the telescopic part 52 stops moving, and the main body 51 moves closer to the second sleeve 3. This causes the second slide rod 4 to move away from the first sleeve 1 until the second slide rod 4 passes through the second through hole 721 and is inserted into the second insertion hole.

[0076] The telescopic component 5 can be vertically arranged, with the first sliding rod 2 located below the second sliding rod 4. Thus, under the weight of the telescopic component 5 itself, when the telescopic part 52 of the telescopic component 5 extends, the telescopic part 52 moves closer to the first sleeve 1 while the main body 51 remains stationary until the first sliding rod 2 passes through the first through hole 711 and inserts into the first insertion hole. After the first restricted part 12 and the first limiting part 22 abut against each other and are locked in place, when the telescopic part 52 of the telescopic component 5 continues to extend, the telescopic part 52 remains stationary while the main body 51 moves closer to the second sleeve 3 until the second sliding rod 4 passes through the second through hole 721 and inserts into the second insertion hole.

[0077] In optional embodiments, such as Figure 3 and Figure 4 As shown, a second limiting part 23 is provided on the first slide rod 2. In the direction in which the first slide rod 2 moves close to the second sleeve 3, the first limiting part 22 can cooperate with the first limiting part 12 for limiting.

[0078] When the telescopic component 5 retracts, the first slide rod 2 moves closer to the second sleeve 3 until the first slide rod 2 leaves the first insertion hole. At that time, the first restricted part 12 just abuts against the second limiting part 23 and is limited, so that the first slide rod 2 cannot continue to move closer to the second sleeve 3, thereby preventing the first slide rod 2 from coming out of the first sleeve 1.

[0079] In a specific embodiment, a first strip groove is formed on the first slide rod 2, the first strip groove being formed along the extension direction of the telescopic part 52. A first limiting protrusion is provided on the inner wall of the first sleeve 1, the first limiting protrusion being inserted into the first strip groove and being able to slide along the first strip groove. Thus, the first limiting protrusion is the first limiting part 12, the end of the first strip groove near the telescopic part 52 is the first limiting part 22, and the end of the first strip groove away from the telescopic part 52 is the second limiting part 23.

[0080] When the telescopic part 52 of the telescopic member 5 extends, the first limiting protrusion moves toward the end of the first strip groove near the telescopic part 52 until the first slide rod 2 passes through the first through hole 711 and is inserted into the first insertion hole. At this time, the first limiting protrusion abuts against the end of the first strip groove near the telescopic part 52 and is in a limiting engagement. When the telescopic part 52 of the telescopic member 5 continues to extend, the telescopic part 52 does not move while the main body 51 moves toward the second sleeve 3 until the second slide rod 4 passes through the second through hole 721 and is inserted into the second insertion hole.

[0081] When the telescopic part 52 of the telescopic member 5 retracts, the first limiting protrusion moves toward the end of the first strip groove away from the telescopic part 52 until the first slide rod 2 leaves the first insertion hole. At this point, the first limiting protrusion abuts against the end of the first strip groove away from the telescopic part 52 and engages in a limiting fit, preventing the first slide rod 2 from moving closer to the second sleeve 3 and thus preventing the first slide rod 2 from coming out of the first sleeve 1.

[0082] It is worth noting that the first limiting part 12 can also be provided on the first slide bar 2, while the first limiting part 22 and the second limiting part 23 can be provided on the first sleeve 1.

[0083] In a further embodiment, such as Figure 5 and Figure 6 As shown, a third limiting part 31 is provided on the second sleeve 3, and a second limiting part 41 is provided on the second slide rod 4. In the direction in which the second slide rod 4 moves closer to the first sleeve 1, the third limiting part 31 can cooperate with the second limiting part 41 for limiting.

[0084] When the telescopic component 5 retracts, the second slide rod 4 moves closer to the first sleeve 1. When the second slide rod 4 leaves the second insertion hole, the second restricted part 41 just abuts against the third limiting part 31 and is limited, so that the second slide rod 4 cannot continue to move closer to the first sleeve 1, thereby preventing the second slide rod 4 from coming out of the second sleeve 3.

[0085] Meanwhile, since the second slide rod 4 cannot move close to the first sleeve 1, the first slide rod 2 cannot move away from the second sleeve 3 when the telescopic member 5 is not in motion, thus preventing the first slide rod 2 from passing through the first through hole 711 when the telescopic part 52 of the telescopic member 5 is not extended.

[0086] In a further embodiment, such as Figure 5 and Figure 6 As shown, a fourth limiting part 32 is provided on the second sleeve 3. In the direction in which the second slide rod 4 moves away from the first sleeve 1, the fourth limiting part 32 can cooperate with the second limiting part 41 for limiting.

[0087] When the telescopic member 5 extends, the second slide rod 4 moves away from the first sleeve 1 until the second slide rod 4 passes through the second through hole 721 and is inserted into the second insertion hole. At this time, the second restricted part 41 and the fourth limiting part 32 abut against each other and limit the movement, so that the second slide rod 4 cannot continue to move away from the first sleeve 1, thereby preventing the second slide rod 4 from extending excessively.

[0088] In a specific embodiment, a second strip groove is opened on the second sleeve 3, the second strip groove is opened along the extension direction of the extension part 52, and a second limiting protrusion is provided on the outer wall of the second slide rod 4, the second limiting protrusion is inserted into the second strip groove and can slide along the second strip groove.

[0089] Thus, the second limiting protrusion is the second limiting part 41, the end of the second strip groove near the main body part 51 is the third limiting part 31, and the end of the first strip groove away from the telescopic part 52 is the fourth limiting part 32.

[0090] When the telescopic part 52 of the telescopic member 5 extends, the first limiting protrusion moves toward the end of the first strip groove near the telescopic part 52 until the first slide rod 2 passes through the first through hole 711 and is inserted into the first insertion hole. At this point, the first limiting protrusion abuts against the end of the first strip groove near the telescopic part 52 and is in a limiting engagement. When the telescopic part 52 of the telescopic member 5 continues to extend, the telescopic part 52 does not move while the main body 51 moves toward the second sleeve 3 until the second slide rod 4 passes through the second through hole 721 and is inserted into the second insertion hole. At this point, the second limiting protrusion abuts against the end of the second strip groove away from the main body 51 and is in a limiting engagement.

[0091] When the telescopic part 52 of the telescopic component 5 retracts, the first limiting protrusion moves towards the end of the first strip groove away from the telescopic part 52 until the first slide rod 2 leaves the first insertion hole. At this point, the first limiting protrusion abuts against the end of the first strip groove away from the telescopic part 52, thus limiting the first slide rod 2 and preventing it from moving further towards the second sleeve 3, thereby preventing the first slide rod 2 from coming out of the first sleeve 1. Meanwhile, the second limiting protrusion moves towards the end of the first strip groove near the main body 51 until the second slide rod 4 leaves the second insertion hole. At this point, the second limiting protrusion abuts against the end of the second strip groove near the main body 51, thus limiting the second slide rod 4 and preventing it from moving further towards the first sleeve 1, thereby preventing the second slide rod 4 from coming out of the second sleeve 3.

[0092] It is worth noting that the second limiting part 41 can also be provided on the second sleeve 3, while the third limiting part 31 and the fourth limiting part 32 can be provided on the second slide rod 4.

[0093] In some combined embodiments, such as Figure 1 and Figure 2 As shown, the telescopic member 5 is vertically arranged, and the first sliding rod 2 is located below the second sliding rod 4. In this way, under the weight of the telescopic member 5 itself, the second restrictive part 41 and the third limiting part 31 are in a limiting engagement.

[0094] When the telescopic part 52 of the telescopic member 5 extends, the telescopic part 52 moves closer to the first sleeve 1 while the main body 51 does not move until the first slide rod 2 passes through the first through hole 711 and is inserted into the first insertion hole. After the first restricted part 12 and the first limiting part 22 abut against each other and are in a limiting engagement, when the telescopic part 52 of the telescopic member 5 continues to extend, the telescopic part 52 does not move while the main body 51 moves closer to the second sleeve 3 until the second slide rod 4 passes through the second through hole 721 and is inserted into the second insertion hole, and the second restricted part 41 and the fourth limiting part 32 are in a limiting engagement.

[0095] When the telescopic part 52 of the telescopic component 5 retracts, the first slide rod 2 leaves the first through hole 711, the second slide rod 4 leaves the second through hole 721, and the first restricted part 12 is in a limiting engagement with the second limiting part 23, and the second restricted part 41 is in a limiting engagement with the third limiting part 31, so as to prevent the first slide rod 2 from coming out of the first sleeve 1 and the second slide rod 4 from coming out of the second sleeve 3.

[0096] According to embodiments of this application, another aspect also provides a lifting boom, such as... Figure 7 As shown, it includes the main arm 7, the auxiliary arm, and any of the above auxiliary arm connecting devices.

[0097] The main arm 7 is provided with at least one set of connecting seats. Each set of connecting seats includes a first connecting seat 71 and a second connecting seat 72. The first connecting seat 71 has a first through hole 711 and the second connecting seat 72 has a second through hole 721. The first through hole 711 and the second through hole 721 are coaxially aligned.

[0098] The auxiliary boom is equipped with at least one set of connectors, each set of connectors including a first connector and a second connector. The first connector has a first socket, and the second connector has a second socket, with the first socket and the second socket coaxially aligned.

[0099] When the first socket is aligned with the first through hole 711, the first slide bar 2 can be inserted into the first socket while passing through the first through hole 711. When the second socket is aligned with the second through hole 721, the second slide bar 4 can be inserted into the second socket while passing through the second through hole 721.

[0100] The operating modes of the first slide bar 2 and the second slide bar 4 are the same as those of the first slide bar 2 and the second slide bar 4 in the above-mentioned auxiliary boom connecting device. Therefore, the technical effects brought by this boom are the same as those of the auxiliary boom connecting device, so they will not be described again.

[0101] In some embodiments, the first connecting seat 71 includes a first plate and a second plate, both of which have a first through hole 711. On the mounting arm, a first connector is inserted between the first and second plates, such that the first through holes 711 on the first and second plates are aligned with the first insertion holes on the first connector. The first slide rod 2 is first passed through the first through hole 711 on the first plate, then inserted and passed through the first insertion hole, and finally passed through the first through hole 711 on the second plate.

[0102] The second connecting seat 72 includes a third plate and a fourth plate. Both the third and fourth plates have a second through hole 721. On the mounting arm, the second connector is inserted between the third and fourth plates, aligning the second through holes 721 on the third and fourth plates with the second insertion holes on the second connector. The first sliding rod 2 is first passed through the second through hole 721 on the third plate, then inserted and passed through the second insertion hole, and finally through the second through hole 721 on the fourth plate.

[0103] With this configuration, the first connector is clamped between the first plate and the second plate, and the second connector is clamped between the first plate and the second plate, making the connection more stable.

[0104] In some embodiments, the main arm 7 is provided with two sets of connectors, which provide a more stable connection than the first connector.

[0105] According to an embodiment of this application, in another aspect, an engineering machine is also provided, including any of the above-mentioned jib connecting devices or lifting booms. The technical effects brought by this engineering machine are the same as those of the jib connecting devices or lifting booms, and therefore will not be described in detail.

[0106] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A sub-arm connecting device, characterized by include: The first sleeve (1) is adapted to be connected to the first connecting seat (71) on the main arm (7) and aligned with the first through hole (711) on the first connecting seat (71); The first slide rod (2) is slidably connected to the first sleeve (1) and can pass through the first through hole (711); The second sleeve (3) is adapted to be connected to the second connecting seat (72) on the main arm (7) and aligned with the second through hole (721) on the second connecting seat (72); The second slide rod (4) is slidably connected to the first sleeve (1) and can pass through the second through hole (721); The telescopic component (5) has a main body (51) and a telescopic part (52) connected to each other. The main body (51) can drive the telescopic part (52) to extend and retract. The telescopic component (5) is located between the first sleeve (1) and the second sleeve (3). The first slide rod (2) is connected to the end of the telescopic part (52) away from the main body (51), and the second slide rod (4) is connected to the end of the main body (51) away from the telescopic part (52). A limiting structure is provided on the telescopic member (5) and is adapted to switch between a locked state and an unlocked state. When the telescopic member (5) is in the unlocked state, the telescopic part (52) can retract; when the telescopic member (5) is in the locked state, the telescopic part (52) is restricted from retracting.

2. The vice arm connecting device of claim 1, wherein The limiting structure includes: The flip-up component (6) is flip-connected to the first slide bar (2). When the telescopic part (52) is extended, the flipping member (6) can be flipped to be arranged in the retraction direction of the telescopic part (52), and can be limited to cooperate with the main body (51) in the retraction direction of the telescopic part (52) so that the flipping member (6) can be switched to the locking state. When the flipping member (6) flips to a position that deviates from the retraction direction of the telescopic part (52), the flipping member (6) switches to the unlocked state.

3. The counterarm connection device of claim 2, wherein, The first slide bar (2) is provided with a rotating shaft (21), the flipping part (6) is provided with a waist-shaped hole and a snap-fit ​​groove (62), the rotating shaft (21) is inserted into the waist-shaped hole, and the first sleeve (1) is provided with a snap-fit ​​protrusion (11). When the flipping member (6) is flipped to be set in the retraction direction along the telescopic part (52), the length direction of the waist-shaped hole and the snap-fit ​​groove (62) are both consistent with the retraction direction of the telescopic part (52), and the groove opening of the snap-fit ​​groove (62) points to the snap-fit ​​protrusion (11).

4. The counterarm connection device of claim 3, wherein The flipping member (6) is provided with a retaining edge (63). When the flipping member (6) is flipped to the retraction direction along the telescopic part (52), the retaining edge (63) and the snap-fit ​​protrusion (11) are limited and engaged along the flipping direction of the flipping member (6).

5. The vice arm connecting device of claim 1, wherein The first slide bar (2) is provided with a first limiting part (22), and the first sleeve (1) is provided with a first restricting part (12). In the direction in which the first slide bar (2) moves away from the second sleeve (3), the first limiting part (22) can cooperate with the first restricting part (12) for limiting.

6. The counterarm connection device of claim 5, wherein, The first slide rod (2) is provided with a second limiting part (23), which can cooperate with the first limiting part (12) in the direction in which the first slide rod (2) moves close to the second sleeve (3).

7. The counterarm connection device of claim 6, wherein, The second sleeve (3) is provided with a third limiting part (31), and the second slide rod (4) is provided with a second limiting part (41). In the direction in which the second slide rod (4) moves close to the first sleeve (1), the third limiting part (31) can cooperate with the second limiting part (41) for limiting.

8. The vice arm connecting device of claim 7, wherein, The second sleeve (3) is provided with a fourth limiting part (32), which can cooperate with the second limiting part (41) in the direction in which the second slide rod (4) moves away from the first sleeve (1).

9. A jib arm, characterized in that include: The main arm (7) is provided with a first connecting seat (71) and a second connecting seat (72). The first connecting seat (71) has a first through hole (711) and the second connecting seat (72) has a second through hole (721). The auxiliary arm is provided with a first connector and a second connector. The first connector has a first socket and the second connector has a second socket. According to any one of claims 1-8, when the first insertion hole is aligned with the first through hole (711), the first slide rod (2) can be inserted into the first insertion hole while passing through the first through hole (711), and when the second insertion hole is aligned with the second through hole (721), the second slide rod (4) can be inserted into the second insertion hole while passing through the second through hole (721).

10. A working machine, characterized in that Includes the auxiliary boom connecting device as described in any one of claims 1-8 or the lifting boom as described in claim 9.

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