Cargo boom and engineering machinery

Abstract

The invention relates to the technical field of engineering machinery, and discloses a cargo boom and engineering machinery, which comprise a first section arm, a first oil inlet joint, a second section arm and a connector. The first knuckle arm comprises a first barrel and a first end plate plugged at one end of the first barrel. The first oil inlet connector is arranged on the first end plate in a penetrating mode. A sliding block is arranged on the outer wall of the second section arm and is inserted into the first barrel in a sliding mode, and a lubricating channel communicated to the sliding connection face is arranged in the sliding block. And the connector is connected to the second knuckle arm and is communicated with the lubricating channel. And when the cargo boom needs to be lubricated by oil, the second section of boom slides along the first barrel, so that the connector is butted and communicated with the first oil inlet connector. Lubricating oil is introduced into the first oil inlet connector through the centralized lubricating system, and the lubricating oil sequentially flows through the connector and the lubricating oil channel for lubrication. The mode that the connector and the first oil inlet connector are in butt joint and communicated is simpler and more efficient, lubricating oil does not need to be pumped in manually, and the oil pumping and lubricating efficiency of the cargo boom is improved.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to a crane arm and engineering machinery. Background Art

[0002] Construction machinery refers to mechanized equipment used in earthwork construction, road construction and maintenance, mobile lifting and loading, and construction projects. Among these, construction machinery for lifting heavy objects is widely used. This type of construction machinery is often equipped with a boom. After lifting the object, the boom itself retracts and expands to lift it. The boom consists of a first boom section and a second boom section. The second boom section is provided with a slider that is inserted into a sliding cavity defined in the first boom section. The slider on the second boom section is slidably connected to the inner wall of the sliding cavity in the first boom section, allowing the second boom section to extend and retract relative to the first boom section.

[0003] To reduce wear between the slider and the inner wall of the sliding cavity, lubricating oil needs to be pumped in between the slider and the inner wall of the sliding cavity. The existing lubricating method involves opening an oiling hole on the first boom section, extending the second boom section to a specified position to align the slider with the oiling hole, and then manually pumping lubricating oil into the space between the slider and the inner wall of the sliding cavity through the oiling hole. This results in low lubrication efficiency.

[0004] Therefore, how to solve or improve the problem of low efficiency in lubricating the boom in the related art has become an important technical problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present application provides a crane arm and engineering machinery to solve or improve the problem of low efficiency in lubricating the crane arm in the related art.

[0006] In a first aspect, the present application provides a lifting arm, comprising:

[0007] The first section arm comprises a first cylinder and a first end plate sealed at one end of the first cylinder;

[0008] a first oil inlet connector, which is provided on the first end plate and is used to communicate with a centralized lubrication system of the engineering machinery;

[0009] A second arm section has a slider disposed on its outer wall, the second arm section is inserted into the first cylinder, the sliding surface of the slider is slidably connected to the inner wall of the first cylinder, and a lubrication channel connected to the sliding surface is disposed in the slider;

[0010] A connecting head is connected to the second arm and communicated with the lubrication channel. When the second arm slides along the first cylinder, the connecting head can be docked and communicated with the first oil inlet joint.

[0011] Optionally, it also includes:

[0012] The second oil inlet joint, the second arm is provided with a sliding cavity, the inner wall of the sliding cavity is provided with the second oil inlet joint, the second oil inlet joint on the second arm is connected with the connecting head, and the second oil inlet joint and the connecting head are arranged in sequence in the sliding direction of the second arm,

[0013] At least two second arms are provided, one second arm is slidably inserted into the first cylinder, and the second arms are sequentially sleeved in a direction away from the first end plate;

[0014] Among the two adjacent second-section arms, the second second-section arm is inserted into the sliding cavity of the first second-section arm, and the sliding surface of the slider is slidably connected to the inner wall of the sliding cavity. When the second second-section arm slides along the sliding cavity, the connecting head of the second second-section arm can be docked and connected with the oil inlet joint of the first second-section arm.

[0015] Optionally, the second arm comprises:

[0016] a second cylinder;

[0017] a second end plate, sealing one end of the second cylinder;

[0018] A partition is provided in the second cylinder, a receiving cavity is formed between the partition and the second end plate, and the side of the partition away from the second end plate forms the sliding cavity,

[0019] The connecting head is provided on the second end plate, and the second oil inlet joint is provided on the partition plate.

[0020] Optionally, the connector includes:

[0021] A connector body section is provided on the second end plate;

[0022] The flared section is connected to the connector body section and is located on the side of the second end plate away from the partition. The inner diameter of the flared section gradually increases in the direction away from the connector body section. The flared section is suitable for the first oil inlet joint or the second oil inlet joint to extend into and dock with.

[0023] Optionally, the first oil inlet joint comprises a first body section and a first closing section connected to each other, the first body section being passed through the first end plate, the first closing section being located in the first cylinder, the inner diameter of the first closing section gradually decreasing in a direction away from the first body section, and the first closing section being adapted to extend into the connector for docking;

[0024] And / or, the second oil inlet joint includes a second body section and a second closing section connected to each other, the second body section is passed through the partition, the second closing section is located in the sliding cavity, the inner diameter of the second closing section gradually decreases in the direction away from the second body section, and the second closing section is suitable for extending into the connecting head for docking.

[0025] Optionally, it also includes:

[0026] The first oil inlet joint is connected to the first end plate through the first elastic member. Under the elastic force of the first elastic member, the first oil inlet joint tends to move closer to the connecting head.

[0027] Optionally, it also includes:

[0028] The second elastic member is connected to the second end plate through the second elastic member. Under the elastic force of the second elastic member, the second oil inlet joint tends to move closer to the connecting head.

[0029] Optionally, it also includes:

[0030] A three-way joint is arranged in the accommodating cavity, the connecting head is communicated with the three-way joint, and the three-way joint is communicated with the lubrication channel and the second oil inlet joint respectively.

[0031] Optionally, it also includes:

[0032] An oil distribution device is connected to the connector. The oil distribution device has a plurality of liquid outlets. The slider is provided with a plurality of liquid outlets. The liquid outlets are connected to the lubrication channels in the slider in a one-to-one correspondence.

[0033] In a second aspect, the present application further provides an engineering machine, comprising:

[0034] Any of the above mentioned jibs;

[0035] A centralized lubrication system is connected to the first oil inlet connector.

[0036] The present application provides a lifting arm, comprising: a first arm section, a first oil inlet joint, a second arm section and a connector. The first arm section comprises a first cylinder and a first end plate blocking one end of the first cylinder. The first oil inlet joint is provided on the first end plate. A slider is provided on the outer wall of the second arm section, and the second arm section is inserted into the first cylinder section. The sliding surface of the slider is slidably connected to the inner wall of the first cylinder section, and a lubrication channel connected to the sliding surface is provided in the slider section. The connector is connected to the second arm section and is connected to the lubrication channel. When the second arm section slides along the first cylinder section, the connector can be docked and connected with the first oil inlet joint.

[0037] Connect the first oil inlet joint to the oil outlet pipeline of the centralized lubrication system on the engineering machinery. When the boom needs to be lubricated, slide the second section of the arm along the first cylinder so that the connector moves close to the first oil inlet joint until the connector is docked and connected with the first oil inlet joint. At this time, use the centralized lubrication system on the engineering machinery to introduce lubricating oil into the first oil inlet joint through the oil outlet pipeline. The lubricating oil then flows through the connector to the lubricating oil channel in the slider, and then flows to between the sliding surface of the slider and the inner wall of the first cylinder, completing the lubrication of the boom. Compared with the method of manually aligning the slider and the oiling hole, the method of docking the connector with the first oil inlet joint is simpler and more efficient, and does not require manual injection of lubricating oil, thereby improving the efficiency of lubricating the boom. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of this application or the technical solutions in related technologies, the following is a brief introduction to the drawings required for use in the specific implementation methods or related technical descriptions. Obviously, the drawings described below are some implementation methods of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0039] Figure 1 This is a schematic structural diagram of a crane arm according to an embodiment of the present application;

[0040] Figure 2 for Figure 1 A partial enlarged schematic diagram;

[0041] Figure 3 for Figure 2 A partial enlarged schematic diagram of center C;

[0042] Figure 4 for Figure 1 A partial enlarged schematic diagram of B in the middle;

[0043] Figure 5 for Figure 4 A partial enlarged schematic diagram of D in the middle;

[0044] Figure 6 A schematic cross-sectional view of a crane arm located between a bulkhead and a second end plate;

[0045] Figure 7 for Figure 6 A partial enlarged schematic diagram of E in the middle;

[0046] Figure 8 It is a cross-sectional schematic diagram of a crane arm located between the second end plate and the first end plate.

[0047] Description of reference numerals:

[0048] 1. First arm section; 11. First cylinder; 12. First end plate; 2. First oil inlet joint; 21. First body section; 22. First closing section; 23. First rib; 24. Second rib; 3. Second arm section; 31. Second cylinder; 32. Second end plate; 321. Mounting hole; 33. Partition; 331. Second sliding hole; 34. Slider; 4. Connector; 41. Connector body section; 42. Expanding section; 5. Second oil inlet joint; 51. Second body section; 52. Second closing section; 53. Third rib; 54. Fourth rib; 6. First elastic member; 7. Second elastic member; 8. T-joint; 9. Oil distribution device. DETAILED DESCRIPTION

[0049] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0050] The following combination Figures 1 to 8 , describing the embodiments of the present application.

[0051] According to an embodiment of the present application, on the one hand, a lifting arm is provided, such as Figure 1 As shown, it includes a first arm 1, a first oil inlet joint 2, a second arm 3 and a connecting head 4.

[0052] like Figure 2 As shown, the first boom 1 includes a first cylinder 11 and a first end plate 12. The first end plate 12 seals one end of the first cylinder 11. The first oil inlet joint 2 is tubular and is disposed on the first end plate 12. The two ends of the first oil inlet joint 2 are located on either side of the first end plate 12. The first end of the first oil inlet joint 2 is located within the first cylinder 11, and the second end of the second oil inlet joint 5 is used to communicate with the oil outlet pipeline of the centralized lubrication system on the engineering machinery, so that the centralized lubrication system on the engineering machinery can supply lubricating oil to the first oil inlet joint 2.

[0053] like Figure 6 As shown, a slider 34 is provided on the outer wall of the second arm 3, and the slider 34 has a sliding surface. The second arm 3 is inserted into the first cylinder 11 so that the sliding surface of the slider 34 is slidably connected to the inner wall of the first cylinder 11, thereby making the second arm 3 slidably connected to the first arm 1, and the second arm 3 can slide along the length direction of the first cylinder 11.

[0054] A lubrication channel is provided inside the slider 34 , wherein the lubrication channel is connected to the sliding surface of the slider 34 . After the second arm 3 is inserted into the first cylinder 11 , lubricating oil is introduced into the lubrication channel, and the lubricating oil can flow between the sliding surface and the inner wall of the first cylinder 11 .

[0055] The connector 4 is connected to the second boom 3 and communicates with the lubricating oil passage, so that lubricating oil is introduced into the connector 4 and flows into the lubricating oil passage. The connector 4 and the first oil inlet connector 2 are arranged sequentially in the sliding direction of the second boom 3, so that when the second boom 3 slides along the first barrel 11 close to the first oil inlet connector 2, the connector 4 can dock and communicate with the first oil inlet connector 2.

[0056] With this arrangement, the first oil inlet connector 2 is connected to the oil outlet pipeline of the centralized lubrication system on the engineering machinery. When the boom needs to be lubricated, the second section arm 3 is slid along the first cylinder 11 so that the connector 4 moves close to the first oil inlet connector 2 until the connector 4 is docked and connected to the first oil inlet connector 2. At this time, the centralized lubrication system on the engineering machinery is used to introduce lubricating oil into the first oil inlet connector 2 through the oil outlet pipeline. The lubricating oil then flows through the connector 4 to the lubricating oil channel in the slider 34, and then flows to between the sliding surface of the slider 34 and the inner wall of the first cylinder 11, completing the lubrication of the boom. Compared with the method of manually aligning the slider 34 and the oiling hole, the method of docking the connector 4 with the first oil inlet connector 2 is simpler and more efficient, and does not require manual injection of lubricating oil, thereby improving the efficiency of lubricating the boom.

[0057] The second boom 3 can slide along the first cylinder 11 between a first position and a second position. When the second boom 3 is in the first position, it is in a fully extended state, and when the second boom 3 is in the second position, it is in a fully retracted state. It can be configured so that when the second boom 3 is in the second position, the connector 4 is in direct contact with the first oil inlet connector 2. This allows lubrication of the boom by simply retracting the second boom 3 to its full position, making it easier and more efficient to connect the connector 4 to the first oil inlet connector 2.

[0058] As an optional embodiment, the boom further includes a second oil inlet connector 5. Figure 1 As shown, a sliding cavity is provided on the second arm 3, and a second oil inlet connector 5 is provided on the inner wall of the sliding cavity. The second oil inlet connector 5 is connected to the connector 4 through a pipeline. In the sliding direction of the second arm 3, the second oil inlet connector 5 and the connector 4 are arranged in sequence.

[0059] At least two second arms 3 are provided. For each second arm 3 , one second arm 3 is slidably inserted into the first cylinder 11 . In the direction away from the first end plate 12 , the second arms 3 are sequentially sleeved.

[0060] For any two adjacent second-section arms 3, the one closer to the first end plate 12 is the first second-section arm 3, and the other is the second second-section arm 3. The second second-section arm 3 is slidably inserted into the sliding cavity of the first second-section arm 3, so that the sliding surface of the slider 34 on the outer wall of the second second-section arm 3 is slidably connected to the inner wall of the sliding cavity of the first second-section arm 3.

[0061] Since the second oil inlet joint 5 and the connecting head 4 are arranged sequentially in the sliding direction of the second section arm 3, when the second second section arm 3 slides along the sliding cavity of the first second section arm 3, the connecting head 4 on the second second section arm 3 can slide close to the second oil inlet joint 5 on the first second section arm 3 until they are docked and connected.

[0062] In this way, the first oil inlet joint 2 is connected to the oil outlet pipeline of the centralized lubrication system on the construction machinery. When the boom needs to be lubricated, the second boom section 3 closest to the first end plate 12 is slid close to the first oil inlet joint 2 until the connector 4 on the second boom section 3 is docked and connected to the first oil inlet joint 2.

[0063] The other second booms 3 are then slid so that the connector 4 on each second boom 3 is connected to the second oil inlet connector 5 on the adjacent second boom 3. This connects the first oil inlet connector 2 to each connector 4 in series. At this point, the centralized lubrication system on the construction machinery is used to supply lubricating oil to the first oil inlet connector 2 through the oil outlet pipeline, allowing the lubricating oil to flow to each connector 4.

[0064] Since the connector 4 is connected to the lubricating oil channel in the slider 34, the lubricating oil flowing to each connector 4 can flow into the lubricating oil channel in the slider 34 on each second section arm 3, thereby lubricating the sliding surface of the slider 34 on each second section arm 3 at the same time.

[0065] Compared with manually aligning the slider 34 and the corresponding oil hole on each second boom 3, the method of docking the connector 4 with the first oil inlet joint 2 and connecting the connector 4 with the second oil inlet joint 5 is simpler and more efficient, and there is no need to manually inject lubricating oil separately. The sliding surfaces of all sliders 34 can be lubricated at the same time, further improving the efficiency of lubricating the boom.

[0066] As an optional embodiment, Figure 4 As shown, the second boom 3 includes a second cylinder 31 and a second end plate 32. The second end plate 32 blocks one end of the second cylinder 31. A partition 33 is disposed within the second cylinder 31, thereby dividing the interior of the second cylinder 31 into a sliding cavity and a receiving cavity. The receiving cavity is located between the partition 33 and the second end plate 32, and the sliding cavity is located on the side of the partition 33 facing away from the second end plate 32.

[0067] The connector 4 is provided on the second end plate 32, so that one end of the connector 4 is located outside the second section arm 3, and the other end of the connector 4 extends into the accommodating cavity. The second oil inlet joint 5 is provided on the partition plate 33, so that one end of the second oil inlet joint 5 extends into the sliding cavity, and the other end extends into the accommodating cavity. The end of the connector 4 extending into the accommodating cavity is connected to the end of the second oil inlet joint 5 extending into the accommodating cavity through a pipeline. The connector 4 and the second oil inlet joint 5 are arranged in sequence in the length direction of the second section arm 3. After the second section arm 3 is slidably inserted in the first cylinder 11, the connector 4 and the first oil inlet joint 2 are arranged in sequence in the sliding direction of the second section arm 3.

[0068] In this way, when it is necessary to lubricate the slider 34 on each second arm 3, the second arm 3 inserted in the first cylinder 11 is slid along the first cylinder 11, so that the connecting head 4 on the second end plate 32 of the second arm 3 moves close to the first oil inlet joint 2 until the connecting head 4 is docked and connected with the first oil inlet joint 2.

[0069] As for the other second-section arms 3, each second-section arm 3 is slid close to the first end plate 12, so that the connecting head 4 on the second end plate 32 of one second-section arm 3 moves close to the second oil inlet joint 5 on the partition 33 of another second-section arm 3, until the connecting head 4 on one second-section arm 3 is docked and connected with the second oil inlet joint 5 on the second second-section arm 3.

[0070] At this time, the centralized lubrication system on the engineering machinery is used to introduce lubricating oil into the first oil inlet joint 2 through the oil outlet pipeline. The lubricating oil can flow to each connector 4 respectively, and then flow to the lubricating oil channel in the slider 34 on each second section arm 3 respectively, thereby lubricating the slider 34 on each second section arm 3.

[0071] It is worth noting that, for the second section arm 3 farthest from the first end plate 12 , the second oil inlet joint 5 provided thereon should be blocked to prevent the lubricating oil from leaking.

[0072] In an optional embodiment, if Figure 3 As shown, the first oil inlet joint 2 includes a first body section 21 and a first closing section 22 . The first body section 21 and the first closing section 22 are sequentially arranged along the sliding direction of the second joint arm 3 and are connected to each other.

[0073] The first body section 21 is passed through the first end plate 12, so that the first closing section 22 is located in the first cylinder 11. The inner diameter of the first closing section 22 gradually decreases in the direction away from the first body section 21 to form a closing shape.

[0074] For the docking of the connector 4 and the first oil inlet joint 2, the first closing section 22 is located between the connector 4 and the first body section 21 of the first oil inlet joint 2. The inner diameter of the first closing section 22 decreases gradually in the direction approaching the connector 4, and the maximum outer diameter of the first closing section 22 is larger than the inner diameter of the connector 4, and the minimum outer diameter of the first closing section 22 is smaller than the inner diameter of the connector 4. In this way, when the connector 4 moves closer to the first oil inlet joint 2, the first closing section 22 can extend into the connector 4, so that the connector 4 rests on the outer wall of the first closing section 22, thereby docking the connector 4 with the first oil inlet joint 2. Since the minimum outer diameter of the first closing section 22 is smaller than the inner diameter of the connector 4, it is convenient to insert the first closing section 22 into the connector 4, reducing the difficulty of docking.

[0075] In an optional embodiment, if Figure 5 As shown, the second oil inlet joint 5 includes a second body section 51 and a second closing section 52 . The second body section 51 and the second closing section 52 are sequentially arranged along the sliding direction of the second joint arm 3 and are connected to each other.

[0076] The second body section 51 is passed through the partition 33 so that the second closing section 52 is located in the sliding cavity. The inner diameter of the second closing section 52 gradually decreases in the direction away from the second body section 51 to form a closing shape.

[0077] For the docking of the connector 4 and the second oil inlet connector 5, the second closing section 52 is located between the connector 4 and the second body section 51 of the second oil inlet connector 5. The inner diameter of the second closing section 52 decreases gradually in the direction approaching the connector 4, and the maximum outer diameter of the second closing section 52 is larger than the inner diameter of the connector 4, and the minimum outer diameter of the second closing section 52 is smaller than the inner diameter of the connector 4. In this way, when the connector 4 moves closer to the second oil inlet connector 5, the second closing section 52 can extend into the connector 4, so that the connector 4 rests on the outer wall of the second closing section 52, thereby docking the connector 4 with the second oil inlet connector 5. Since the minimum outer diameter of the second closing section 52 is smaller than the inner diameter of the connector 4, it is convenient to insert the second closing section 52 into the connector 4, reducing the difficulty of docking.

[0078] It is worth noting that the first oil inlet connector 2 and the second oil inlet connector can be separately provided in respective corresponding ways, or can be provided in respective corresponding ways at the same time.

[0079] In other optional embodiments, the connector 4 includes a connector body section 41 and a flared section 42 , and the connector body section 41 and the flared section 42 are sequentially arranged along the sliding direction of the second section arm 3 and are interconnected and communicated.

[0080] The connector body section 41 is passed through the inner wall of the sliding cavity so that the flared section 42 is located outside the sliding cavity. The inner diameter of the flared section 42 gradually increases in the direction away from the connector body section 41 to form a flared shape.

[0081] For docking of the connector 4 with the first oil inlet connector 2, the flared section 42 of the connector 4 is located between the first oil inlet connector 2 and the connector body section 41 of the connector 4. The inner diameter of the flared section 42 increases gradually as it approaches the first oil inlet connector 2, and the maximum inner diameter of the flared section 42 is greater than the outer diameter of the first oil inlet connector 2, while the minimum inner diameter of the flared section 42 is less than the outer diameter of the first oil inlet connector 2. Thus, when the connector 4 moves closer to the first oil inlet connector 2, the first oil inlet connector 2 can extend into the flared section 42 and rest against the inner wall of the flared section 42, allowing the connector 4 to dock with the first oil inlet connector 2. Because the maximum inner diameter of the flared section 42 is greater than the outer diameter of the first oil inlet connector 2, the first oil inlet connector 2 is easily inserted into the flared section 42, reducing the difficulty of docking.

[0082] For docking of the connector 4 with the second oil inlet connector 5, the flared section 42 of the connector 4 is located between the second oil inlet connector 5 and the connector body section 41 of the connector 4. The inner diameter of the flared section 42 increases gradually as it approaches the second oil inlet connector 5, with the maximum inner diameter of the flared section 42 being greater than the outer diameter of the second oil inlet connector 5, and the minimum inner diameter of the flared section 42 being less than the outer diameter of the second oil inlet connector 5. Thus, when the connector 4 moves closer to the second oil inlet connector 5, the second oil inlet connector 5 can extend into the flared section 42 and rest against the inner wall of the flared section 42, allowing the connector 4 to dock with the second oil inlet connector 5. Because the maximum inner diameter of the flared section 42 is greater than the outer diameter of the second oil inlet connector 5, the second oil inlet connector 5 is easily inserted into the flared section 42, reducing the difficulty of docking.

[0083] On this basis, in a further embodiment, as Figure 3 As shown, the first oil inlet connector 2 includes a first body section 21 and a first closing section 22. The first body section 21 and the first closing section 22 are arranged sequentially along the sliding direction of the second joint arm 3 and are interconnected and communicated. The first body section 21 is inserted through the first end plate 12, so that the first closing section 22 is located within the first barrel 11. The inner diameter of the first closing section 22 gradually decreases in the direction away from the first body section 21, forming a closing shape.

[0084] For the docking of the connector 4 with the first oil inlet joint 2, the first closing section 22 is located between the connector 4 and the first body section 21 of the first oil inlet joint 2. The inner diameter of the first closing section 22 decreases gradually in the direction approaching the connector 4, and the maximum outer diameter of the first closing section 22 is smaller than the maximum inner diameter of the flaring section 42, and the minimum outer diameter of the first closing section 22 is larger than the minimum inner diameter of the flaring section 42. In this way, when the connector 4 moves closer to the first oil inlet joint 2, the first closing section 22 can extend into the flaring section 42, so that the outer wall of the first closing section 22 rests on the inner wall of the flaring section 42, thereby docking the connector 4 with the first oil inlet joint 2. Since the maximum outer diameter of the first closing section 22 is smaller than the maximum inner diameter of the flaring section 42, it is convenient for the first closing section 22 to be inserted into the flaring section 42, reducing the difficulty of docking.

[0085] In other further embodiments, Figure 5 As shown, the second oil inlet connector 5 includes a second main section 51 and a second closing section 52. The second main section 51 and the second closing section 52 are arranged sequentially along the sliding direction of the second joint arm 3 and are interconnected and communicated. The second main section 51 is inserted through the partition 33, so that the second closing section 52 is located within the sliding cavity. The inner diameter of the second closing section 52 gradually decreases away from the second main section 51, forming a closing shape.

[0086] For the docking of the connector 4 and the second oil inlet connector 5, the second closing section 52 is located between the connector 4 and the second body section 51 of the second oil inlet connector 5. The inner diameter of the second closing section 52 decreases gradually in the direction approaching the connector 4, and the maximum outer diameter of the second closing section 52 is smaller than the maximum inner diameter of the flaring section 42, and the minimum outer diameter of the second closing section 52 is larger than the minimum inner diameter of the flaring section 42. In this way, when the connector 4 moves closer to the second oil inlet connector 5, the second closing section 52 can extend into the flaring section 42, so that the outer wall of the second closing section 52 rests on the inner wall of the flaring section 42, thereby docking the connector 4 with the second oil inlet connector 5. Since the maximum outer diameter of the second closing section 52 is smaller than the maximum inner diameter of the flaring section 42, it is convenient for the second closing section 52 to be inserted into the flaring section 42, reducing the difficulty of docking.

[0087] It is worth noting that the first oil inlet connector 2 and the second oil inlet connector can be separately provided in respective corresponding ways, or can be provided in respective corresponding ways at the same time.

[0088] As an optional embodiment, Figure 3As shown, the boom also includes a first elastic member 6. The first elastic member 6 can be a spring. The first oil inlet joint 2 is connected to the first end plate 12 via the first elastic member 6. When the second section arm 3 slides close to the first end plate 12 and the connector 4 docks with the first oil inlet joint 2, if the second section arm 3 continues to slide close to the first end plate 12, the first elastic member 6 is compressed, allowing the first oil inlet joint 2 to slide relative to the first end plate 12. At this time, under the elastic force of the first elastic member 6, the first oil inlet joint 2 tends to move close to the connector 4, thereby pressing against the connector 4 and maintaining docking.

[0089] The first elastic member 6 can play a buffering role, thereby preventing the first oil inlet joint 2 and the connector 4 from being rigidly abutted, thereby preventing the first oil inlet joint 2 and the connector 4 from being damaged by a large impact.

[0090] Specifically, a sliding hole is defined in the first end plate 12, and the first oil inlet connector 2 is slidably disposed within the first sliding hole. A first rib 23 is disposed on the sidewall of the first oil inlet connector 2. The first rib 23 is located within the first barrel 11, connecting one end of the first elastic member 6 to the first rib 23 and the other end of the first elastic member 6 to the side of the first rib 23 closest to the first end plate 12. Consequently, when the first rib 23 slides away from the connector 4 and closer to the first end plate 12, the first elastic member 6 is compressed. Under the elastic force of the first elastic member 6, the first rib 23 and the first oil inlet connector 2 tend to move closer to the connector 4, causing the first oil inlet connector 2 to abut and maintain contact with the connector 4.

[0091] A second rib 24 is provided on the sidewall of the first oil inlet connector 2, located outside the first barrel 11. When the connector 4 is separated from the first oil inlet connector 2, the elastic force of the first elastic member 6 causes the second rib 24 to abut against the first end plate 12, preventing the first oil inlet connector 2 from disengaging from the first slide hole. A nut can be screwed onto the portion of the first oil inlet connector 2 located outside the first barrel 11 to form the second rib 24.

[0092] As an optional embodiment, Figure 5 As shown, the boom further includes a second elastic member 7. The second elastic member 7 can be a spring. The second oil inlet connector 5 is connected to the partition 33 via the second elastic member 7. When the second boom 3 slides close to the partition 33 of the other second boom 3 and the connector 4 docks with the second oil inlet connector 5, if the second boom 3 continues to approach the partition 33 of the other second boom 3, the second elastic member 7 is compressed, allowing the second oil inlet connector 5 to slide close to the partition 33 of the other second boom 3. At this time, under the elastic force of the second elastic member 7, the second oil inlet connector 5 tends to move close to the connector 4, thereby pressing against the connector 4 and maintaining docking.

[0093] The second elastic member 7 can play a buffering role, thereby preventing the second oil inlet joint 5 and the connector 4 from being rigidly abutted, thereby preventing the second oil inlet joint 5 and the connector 4 from being damaged by a large impact.

[0094] Specifically, a second sliding hole 331 is defined in the partition 33, and the second oil inlet connector 5 is slidably inserted into the second sliding hole 331. A third rib 53 is provided on the sidewall of the second oil inlet connector 5. The third rib 53 is located within the sliding cavity, connecting one end of the second elastic member 7 to the third rib 53 and the other end of the second elastic member to the side of the third rib 53 closest to the partition 33. As the third rib 53 slides away from the connector 4 and toward the partition 33, the second elastic member 7 is compressed. Under the elastic force of the second elastic member 7, the third rib 53 and the second oil inlet connector 5 tend to move closer to the connector 4, causing the second oil inlet connector 5 to abut and maintain contact with the connector 4.

[0095] A fourth rib 54 is provided on the sidewall of the second oil inlet connector 5 and is located within the accommodating cavity. When the connector 4 is separated from the second oil inlet connector 5, the elastic force of the second elastic member 7 causes the fourth rib 54 to abut against the partition 33, preventing the first oil inlet connector 2 from disengaging from the second sliding hole 331. A nut can be screwed onto the portion of the second oil inlet connector 5 located within the accommodating cavity to form the fourth rib 54.

[0096] The second sliding hole 331 may be a waist-shaped hole, which facilitates adjustment of the position of the second oil inlet connector 5 .

[0097] In some embodiments, a mounting hole 321 is provided on the second end plate 32, and an external thread is provided on the side wall of the connector 4. After the connector 4 is inserted into the mounting hole 321, nuts are screwed onto the parts of the connector 4 on both sides of the second end plate 32 to tighten against the second end plate 32, so as to fix the connector 4 to the second end plate 32.

[0098] The mounting hole 321 may be a waist-shaped hole, which facilitates adjustment of the position of the connector 4 .

[0099] Furthermore, the second sliding hole 331 and the mounting hole 321 are arranged crosswise in the sliding direction of the second section arm 3.

[0100] As an optional embodiment, the lifting arm further includes a three-way joint 8. A three-way joint 8 is provided in the accommodating cavity of each second section arm 3, and the three-way joint 8 has a first interface, a second interface and a third interface.

[0101] The connector 4 is connected to the first interface through a pipeline, the second oil inlet connector 5 is connected to the second interface through a pipeline, and the third interface is connected to the lubricating oil channel in the slider 34 on the second section arm 3 through a pipeline.

[0102] In this way, after the oil enters from the connector 4 on the second boom 3, it can enter the lubricating oil channel and the second oil inlet joint 5 in the block through the tee joint 8. Thus, while lubricating the slider 34 on the second boom 3, the oil can be directed to the second oil inlet joint 5 to pass the lubricating oil to the next second boom 3.

[0103] As an optional embodiment, Figures 6 to 8 As shown, the boom further comprises an oil separator 9, which is arranged in the accommodating cavity. The oil separator 9 has a liquid inlet and a plurality of liquid outlets, and the liquid inlet is communicated with each liquid outlet respectively.

[0104] For each second section arm 3, a plurality of sliders 34 are provided on the outer wall thereof, and the sliding surface of each slider 34 is used for sliding connection, so that the connection is more stable and reliable.

[0105] The liquid inlet of the oil separator 9 is connected to the connector 4 through a pipeline, and then the liquid outlets of the oil separator 9 are connected to the lubricating oil channels in the slider 34 in a one-to-one correspondence.

[0106] In this way, the lubricating oil flowing in from the connector 4 enters the oil distribution device 9 through the liquid inlet, and the lubricating oil then flows into the lubricating oil channel of each slider 34 through each liquid outlet, thereby achieving simultaneous lubrication of multiple sliders 34 on each second section arm 3.

[0107] According to an embodiment of the present application, another aspect of the present invention provides an engineering machine comprising a centralized lubrication system and any of the above-described booms, wherein the centralized lubrication system is connected to the first oil inlet connector 2 of the boom. The technical effects of the engineering machine are the same as those of the boom, and therefore will not be described in detail.

[0108] The construction machinery may be a crane.

[0109] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the present application.

Claims

1. A lifting arm, characterized in that: include: The first section arm (1) comprises a first cylinder (11) and a first end plate (12) sealed at one end of the first cylinder (11); A first oil inlet connector (2) is provided on the first end plate (12) and is used for communicating with a centralized lubrication system of the engineering machinery; A second arm (3) is provided with a slider (34) on its outer wall, the second arm (3) is inserted into the first cylinder (11), the sliding surface of the slider (34) is slidably connected to the inner wall of the first cylinder (11), and a lubrication channel connected to the sliding surface is provided in the slider (34); A connector (4) is connected to the second arm (3) and communicates with the lubrication channel. When the second arm (3) slides along the first cylinder (11), the connector (4) can be docked and communicated with the first oil inlet connector (2).

2. The lifting arm according to claim 1, characterized in that Also includes: The second oil inlet joint (5) is provided on the second arm (3) with a sliding cavity, the inner wall of the sliding cavity is provided with the second oil inlet joint (5), the second oil inlet joint (5) on the second arm (3) is connected with the connecting head (4), and the second oil inlet joint (5) and the connecting head (4) are arranged in sequence in the sliding direction of the second arm (3). At least two second arms (3) are provided, one second arm (3) is slidably inserted into the first cylinder (11), and each second arm (3) is sequentially sleeved in a direction away from the first end plate (12); Of the two adjacent second-section arms (3), the second second-section arm (3) is inserted into the sliding cavity of the first second-section arm (3), and the sliding surface of the slider (34) is slidably connected to the inner wall of the sliding cavity. When the second second-section arm (3) slides along the sliding cavity, the connector (4) of the second second-section arm (3) can be docked and connected with the oil inlet connector of the first second-section arm (3).

3. The lifting arm according to claim 2, characterized in that: The second arm (3) comprises: a second cylinder (31); A second end plate (32) is sealed at one end of the second cylinder (31); A partition (33) is provided in the second cylinder (31), and a receiving cavity is formed between the partition (33) and the second end plate (32), and the side of the partition (33) facing away from the second end plate (32) forms the sliding cavity. The connecting head (4) is provided on the second end plate (32), and the second oil inlet joint (5) is provided on the partition plate (33).

4. The lifting arm according to claim 3, characterized in that The connector (4) comprises: A connector body section (41) is provided on the second end plate (32); A flared section (42) is connected to the connector body section (41) and is located on a side of the second end plate (32) away from the partition (33). The inner diameter of the flared section (42) gradually increases in a direction away from the connector body section (41). The flared section (42) is suitable for allowing the first oil inlet connector (2) or the second oil inlet connector (5) to extend into and connect with the connector.

5. The lifting arm according to any one of claims 3 to 4, characterized in that: The first oil inlet joint (2) comprises a first body section (21) and a first closing section (22) connected to each other, the first body section (21) being passed through the first end plate (12), the first closing section (22) being located in the first cylinder (11), the inner diameter of the first closing section (22) gradually decreasing in a direction away from the first body section (21), and the first closing section (22) being suitable for extending into the connector (4) for docking; And / or, the second oil inlet joint (5) includes a second body section (51) and a second closing section (52) connected to each other, the second body section (51) is passed through the partition (33), the second closing section (52) is located in the sliding cavity, the inner diameter of the second closing section (52) gradually decreases in a direction away from the second body section (51), and the second closing section (52) is suitable for extending into the connector (4) for docking.

6. The lifting arm according to claim 1, characterized in that Also includes: A first elastic member (6), wherein the first oil inlet connector (2) is connected to the first end plate (12) via the first elastic member (6), and under the elastic force of the first elastic member (6), the first oil inlet connector (2) tends to move closer to the connector (4).

7. The lifting arm according to claim 3, characterized in that: Also includes: A second elastic member (7), the second oil inlet connector (5) is connected to the second end plate (32) via the second elastic member (7), and under the elastic force of the second elastic member (7), the second oil inlet connector (5) tends to move closer to the connector (4).

8. The lifting arm according to claim 3, characterized in that Also includes: A three-way joint (8) is arranged in the accommodating cavity, the connecting head (4) is connected to the three-way joint (8), and the three-way joint (8) is respectively connected to the lubrication channel and the second oil inlet joint (5).

9. The boom according to claim 1, wherein: Also includes: An oil distribution device (9) is connected to the connector (4). The oil distribution device (9) has a plurality of liquid outlets. The slider (34) is provided with a plurality of liquid outlets. The liquid outlets are connected to the lubrication channels in the slider (34) in a one-to-one correspondence.

10. An engineering machine, characterized in that: include: The boom according to any one of claims 1 to 9; A centralized lubrication system is connected to the first oil inlet connector (2).

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