An arm system and an engineering vehicle

Abstract

The embodiment of the present application provides an arm support system and an engineering vehicle. The arm support system comprises an arm support body and a telescopic part. The arm support body comprises a basic arm and a telescopic arm. The telescopic part comprises a first component connected with the basic arm and a second component connected with the telescopic arm. The second component is telescopic relative to the first component along the axial direction to drive the telescopic arm to be telescopic relative to the basic arm. The first component further has a first swing center. The first component can swing in a swing plane relative to the first swing center and can drive the second component to swing in the swing plane relative to the first swing center. The arm support system of the embodiment of the present application can reduce the possibility that the telescopic part bears radial load, the sealing performance of the telescopic part is better, and thus the service life of the telescopic part and the reliability of the arm support system are improved.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, and in particular to a boom system and engineering vehicle. Background Technology

[0002] A boom system generally includes a telescopic cylinder and a boom body. The boom body includes a basic boom and a telescopic boom. The telescopic cylinder controls the extension and retraction of the telescopic boom by extending and retracting.

[0003] In related technologies, because the telescopic cylinder has a relatively large extension stroke, the telescopic boom is prone to deflection deformation after extending a large amount, which causes the telescopic cylinder to bear radial load, making it possible for the telescopic cylinder to leak oil, thereby affecting the service life of the telescopic cylinder and the reliability of the boom system. Summary of the Invention

[0004] In view of this, embodiments of this application aim to provide a boom system and engineering vehicle that reduce the possibility of the telescopic component bearing radial loads, thereby improving the service life of the telescopic component and the reliability of the boom system.

[0005] To achieve the above objectives, one embodiment of this application provides a boom system, including:

[0006] The main body of the boom includes the basic boom and the telescopic boom;

[0007] The telescopic component includes a first member connected to the base arm and a second member connected to the telescopic arm, the second member extending or retracting relative to the first member along its axial direction to drive the telescopic arm to extend or retract relative to the base arm;

[0008] The first component also has a first swing center, and the first component can swing relative to the first swing center in a plane of rotation, and can drive the second component to swing relative to the first swing center in the plane of rotation.

[0009] In one embodiment, the end of the first component is connected to the basic arm, and the first swing center is located at the end of the first component.

[0010] In one embodiment, the boom system further includes a first joint bearing, the boom body further includes a first connecting shaft, the basic boom is provided with the first connecting shaft along its width direction, the first component is provided with a connecting through hole, the inner ring of the first joint bearing is sleeved on the first connecting shaft, and the first component is sleeved on the outer ring of the first joint bearing through the connecting through hole.

[0011] The outer ring of the first spherical bearing and the inner ring of the first spherical bearing are spherically fitted, and the first swing center overlaps with the axis of the first spherical bearing.

[0012] In one embodiment, the inner ring of the first spherical bearing is positioned and engaged with the first connecting shaft along its axial direction.

[0013] In one embodiment, the outer ring of the first spherical bearing is positioned and engaged with the wall of the connecting through hole along its axial direction.

[0014] In one embodiment, the telescopic arm has connecting grooves on the inner sides of both sides of the wall along the width direction, and two second connecting shafts are provided on the side wall of the second component, and the two second connecting shafts are respectively oscillatingly disposed in the two connecting grooves.

[0015] In one embodiment, the boom system further includes a slider with a second swing center, at least one second connecting shaft is disposed in a corresponding connecting groove through the slider, and the second swing center is located on the axis of the second connecting shaft;

[0016] The first component swings around the first swing center in the plane of rotation, thereby driving the slider to swing around the first swing center and the second swing center in the plane of rotation in the corresponding connecting groove.

[0017] In one embodiment, the boom system further includes a second joint bearing, the sliding member is provided with a connecting hole, the inner ring of the second joint bearing is sleeved on the second connecting shaft, and the sliding member is sleeved on the outer ring of the second joint bearing through the connecting hole;

[0018] The outer ring of the second spherical bearing and the inner ring of the second spherical bearing are spherically fitted, and the second swing center overlaps with the axis of the second spherical bearing.

[0019] In one embodiment, the inner ring of the second spherical bearing is positioned and engaged with the second connecting shaft along its axial direction.

[0020] In one embodiment, the outer ring of the second spherical bearing is positioned and engaged with the wall of the connecting hole along its axial direction.

[0021] In one embodiment, the number of the slider is one, and one of the two second connecting shafts is disposed in the corresponding connecting groove through the slider.

[0022] Another embodiment of this application provides an engineering vehicle, including a vehicle body and a boom system as described in any of the above embodiments, wherein the boom system is mounted on the vehicle body.

[0023] In the boom system of this application embodiment, the first component can swing relative to the first swing center in a plane of rotation, and can drive the second component to swing relative to the first swing center in a plane of rotation. That is, when the distal end of the telescopic boom deforms and the telescopic boom presses against the second component, i.e., the telescopic boom applies a radial force to the second component, the second component can transmit this radial force to the first component, and the first component swings around the first swing center under the action of this radial force, thereby driving the second component to swing synchronously around the first swing center. After the radial force applied to the second component gradually decreases to zero, the second component is no longer under force, and the entire telescopic component can stop moving. In this way, the possibility of the telescopic component bearing radial load is reduced, the sealing performance of the telescopic component is better, thereby improving the service life of the telescopic component and the reliability of the boom system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the telescopic arm compressing the telescopic component after deflection deformation in the plane of rotation in related technologies;

[0025] Figure 2 This is a schematic diagram of the boom system in the plane of rotation according to an embodiment of this application;

[0026] Figure 3 This is a partial structural cross-sectional view of a boom system according to an embodiment of this application along the plane containing its width.

[0027] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0028] Figure 5 for Figure 3 Enlarged view of point C in the middle;

[0029] Figure 6 This is a partial structural cross-sectional view of a boom system according to an embodiment of the present application along the plane containing its width direction, wherein the boom system is not equipped with the first connector and the second connector;

[0030] Figure 7 for Figure 6 Enlarged view of point D;

[0031] Figure 8 for Figure 6 Enlarged view of point E in the middle;

[0032] Figure 9 This is a schematic diagram of a slider according to an embodiment of the present application, swinging around a first swing center and a second swing center in a plane of rotation.

[0033] Explanation of reference numerals in the attached figures

[0034] 10. Boom system; 11. Boom body; 111. Basic boom; 112. Telescopic boom; 112a. Receiving cavity; 112b. Connecting groove; 113. First connecting shaft; 12. Telescopic component; 121. First component; 121a. Connecting through hole; 121b. First stepped surface; 122. Second component; 122a. Second connecting shaft; 13. First joint bearing; 14. Sliding component; 14a. Connecting hole; 14b. Second stepped surface; 15. Second connecting component; 16. First limiting component; 17. Second limiting component; 18. Third limiting component; 19. Fourth limiting component; O1. First swing center; O2. Second swing center. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0036] In the embodiments of this application, the orientation or positional relationship of the "width direction" is based on the appendix. Figure 3 Appendix Figure 6 and appendix Figure 9 The orientations or positional relationships shown are intended only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1 As shown, in related technologies, engineering vehicles such as aerial work platforms and high-pressure water jetting vehicles need to perform actions involving lateral force application on the boom body 11'. For example, when cleaning or removing rust from the hull of a ship, the engineering vehicle needs to spray high-pressure water onto the hull to wash away dirt or rust. During the washing process, the telescopic boom 112' of the engineering vehicle needs to apply pressure to the side of the hull to make the sprayed water stream close to the hull, thereby improving the cleaning effect.

[0039] In the fully extended state, the boom system 10' of the engineering vehicle has a relatively large total length of telescopic boom 112' and basic boom 111'. The overall support point of the boom system 10' is at one end of the basic boom 111' connected to the vehicle body. The end of the telescopic boom 112' furthest from this support point is prone to deflection deformation under lateral forces. Specifically... Figure 1As shown at point A', the telescopic component 12' inside the boom system 10' (especially the second component 122' of the telescopic component 12') is subjected to radial force due to the deflection deformation of the telescopic boom 112', which can easily lead to oil leakage or damage to the telescopic component 12', thereby affecting the service life of the telescopic component 12 and the reliability of the boom system 10'.

[0040] In view of this, such as Figures 2 to 9 As shown, one embodiment of this application provides an engineering vehicle. The engineering vehicle includes a body (not shown) and a boom system 10 according to any embodiment of this application.

[0041] The boom system 10 is mounted on the vehicle body. Movement of the vehicle body on the ground causes the boom system 10 to move.

[0042] like Figures 2 to 9 As shown, another aspect of this application provides a boom system 10. The boom system 10 includes a boom body 11 and a telescopic member 12. The boom body 11 includes a basic boom 111 and a telescopic boom 112. The telescopic member 12 includes a first member 121 connected to the basic boom 111 and a second member 122 connected to the telescopic boom 112. The second member 122 drives the telescopic boom 112 to extend and retract relative to the basic boom 111 by extending and retracting relative to the first member 121 along its axial direction. The first member 121 also has a first swing center O1. The first member 121 can swing relative to the first swing center O1 in a plane of rotation and can drive the second member 122 to swing relative to the first swing center O1 in a plane of rotation.

[0043] The type of engineering vehicle is not limited. For example, it can be an aerial work platform vehicle, a high-pressure water jetting vehicle, etc. For example, a high-pressure water jetting vehicle is used as an example. The high-pressure water jetting vehicle can be used for cleaning the hull. During the cleaning operation, the cleaning component can be set at the far end of the telescopic boom 112. The main body of the vehicle moves, thereby driving the cleaning component set at the far end of the telescopic boom 112 to move, thereby completing the cleaning operation of the hull.

[0044] The distal end of the telescopic arm 112 refers to the end of the telescopic arm 112 that is away from the base arm 111 after it has extended relative to the base arm 111.

[0045] It should be noted that the slewing plane refers to the plane in the width direction of the basic boom 111 or the telescopic boom 112. By rotating within the slewing plane, the boom body 11 can control the distal end of the telescopic boom 112 to generate horizontal displacement on the current horizontal plane and move to different working positions.

[0046] When the high-pressure jet truck is cleaning the hull, the friction between the cleaning components and the hull causes the distal end of the telescopic boom 112 to be subjected to a load on the plane of rotation, resulting in deflection deformation of the telescopic boom 112. This may also compress the second component 122, thus affecting the overall sealing performance of the telescopic component 12, and consequently affecting the service life of the telescopic component 12 and the reliability of the boom system 10.

[0047] like Figure 2 As shown, the boom body 11 includes a basic boom 111 and a telescopic boom 112. In this embodiment, the basic boom 111 is connected to the vehicle body, and the telescopic boom 112 is telescopically oriented relative to the basic boom 111.

[0048] Understandably, the connection position of the basic arm 111 on the vehicle body is relatively fixed, and the telescopic arm 112 can extend or retract relative to the basic arm 111 by moving along its own axis.

[0049] like Figures 2 to 8 As shown, the telescopic member 12 includes a first member 121 connected to the base arm 111 and a second member 122 connected to the telescopic arm 112. The second member 122 drives the telescopic arm 112 to extend or retract relative to the base arm 111 by extending or retracting relative to the first member 121 along its axial direction.

[0050] The type of telescopic component 12 is not limited. For example, it can be a telescopic hydraulic cylinder, a telescopic pneumatic cylinder, etc.

[0051] For example, the telescopic member 12 is a telescopic hydraulic cylinder. The telescopic hydraulic cylinder includes a telescopic rod and a cylinder. The telescopic rod is disposed inside the cylinder. By supplying oil to the rod-side chamber or the rodless chamber of the cylinder, the telescopic rod is driven to extend or retract axially relative to the cylinder. One of the first member 121 and the second member 122 is a telescopic rod, and the other is a cylinder, thus realizing the extension and retraction of the telescopic arm 112 relative to the basic arm 111.

[0052] There is no limit to the number of telescopic booms 112. For example, it can be one section or multiple sections.

[0053] It should be noted that in the embodiments of this application, "multiple sections" refers to two or more sections.

[0054] For example, a two-section telescopic boom 112 is used as an example. The two sections of the telescopic boom 112 are a two-section boom and a three-section boom. In the fully extended state, the two-section boom is located at one end of the base boom 111, and the three-section boom is located at the end of the two-section boom away from the base boom 111. A second component 122 is connected to the two-section boom. The boom system 10 also includes a wire rope (not shown) and a pulley system (not shown). The second component 122 telescopically extends relative to the first component 121, and the two-section boom can extend and retract relative to the base boom 111. At the same time, in conjunction with the wire rope and pulley system, the three-section boom can also extend or retract synchronously.

[0055] like Figure 2 As shown, the first component 121 also has a first swing center O1. The first component 121 can swing relative to the first swing center O1 in the plane of rotation, and can drive the second component 122 to swing relative to the first swing center O1 in the plane of rotation.

[0056] It should be noted that the first component 121 can swing within the rotation plane at any angle relative to the first swing center O1. For example, the swing angle range is 12°, that is, with the axis of the basic arm 111 as the critical line, the first component 121 swings on both sides of the critical line, and can swing to a position with an angle of 6° with the critical line.

[0057] The first swing center O1 is located at the connection position between the first component 121 and the basic arm 111. The second component 122 as a whole can also swing around the first swing center O1, thereby generating movement in the corresponding direction on the telescopic arm 112.

[0058] like Figure 2 As shown at point A, when the telescopic boom 112 undergoes deflection and presses against the second component 122, that is, the telescopic boom 112 applies a force on the plane of rotation to the second component 122. Since both the first component 121 and the second component 122 can swing around the first swing center O1, this force can be converted into a force that drives the first component 121 and the second component 122 to swing around the first swing center O1, thereby achieving force relief. The possibility of the telescopic component 12 bearing radial load as a whole is reduced, thereby improving the service life of the telescopic component 12 and the reliability of the boom system 10.

[0059] In the boom system 10 of this application embodiment, the first component 121 can swing relative to the first swing center O1 in the plane of rotation, and can drive the second component 122 to swing relative to the first swing center O1 in the plane of rotation. That is, when the distal end of the telescopic boom 112 undergoes deflection deformation and presses against the second component 122, i.e., the telescopic boom 112 applies a radial force to the second component 122, the second component 122 can transmit this radial force to the first component 121, the first component 121 swings around the first swing center O1 under the action of this radial force, thereby driving the second component 122 to swing synchronously around the first swing center O1. After the radial force applied to the second component 122 gradually decreases to zero, the second component 122 is no longer under force, and the telescopic component 12 as a whole can stop moving. In this way, the possibility of the telescopic component 12 bearing radial load is reduced, the sealing performance of the telescopic component 12 is better, thereby improving the service life of the telescopic component 12 and the reliability of the boom system 10.

[0060] It should be noted that the first component 121 can also swing relative to the first swing center O1 in the variable amplitude plane, and can drive the second component 122 to swing relative to the first swing center O1 in the variable amplitude plane.

[0061] Specifically, the swing of the telescopic member 12 in the luffing plane can be referenced to its swing in the rotation plane. In this way, when the telescopic member 12 is subjected to load in both the rotation plane and the luffing plane, it can generate corresponding swing to eliminate the load, thereby reducing the possibility of the telescopic member 12 bearing radial load.

[0062] like Figures 2 to 4 As shown, in some embodiments, the end of the first component 121 is connected to the basic arm 111, and the first swing center O1 is located at the end of the first component 121.

[0063] In other words, during the swinging process of the first component 121 around the first swing center O1, only the end of the first component 121 close to the second component 122 generates a certain swing trajectory, and the end of the first component 121 away from the second component 122 will not generate a large displacement in the plane of rotation. Thus, when the swinging angle of the first component 121 around the first swing center O1 is large, the end of the first component 121 away from the second component 122 will not touch the basic arm 111.

[0064] like Figure 3 and Figure 4As shown, in some embodiments, the boom system 10 further includes a first joint bearing 13, the boom body 11 further includes a first connecting shaft 113, the basic boom 111 is provided with the first connecting shaft 113 along its width direction, the first component 121 is provided with a connecting through hole 121a, the inner ring of the first joint bearing 13 is sleeved on the first connecting shaft 113, the first component 121 is sleeved on the outer ring of the first joint bearing 13 through the connecting through hole 121a, the outer ring of the first joint bearing 13 and the inner ring of the first joint bearing 13 are spherically fitted, and the first swing center O1 overlaps with the axis of the first joint bearing 13.

[0065] In this embodiment, the first component 121 is indirectly connected to the basic arm 111 through the first connecting shaft 113. The first connecting shaft 113 is relatively stationary, and the first component 121 swings about the first swing center O1 relative to the first connecting shaft 113.

[0066] The diameter of the connecting through hole 121a is larger than the diameter of the first connecting shaft 113. That is, there is a gap between the wall of the connecting through hole 121a and the peripheral wall of the first connecting shaft 113. This gap provides the first component 121 with the swing space required to swing around the first swing center O1. The first joint bearing 13 is disposed in this gap.

[0067] The outer ring and inner ring of the first spherical plain bearing 13 are spherically fitted. Therefore, one of the outer ring and inner ring of the first spherical plain bearing 13 can swing relative to the other about the axis of the first spherical plain bearing 13. That is, the inner ring of the first spherical plain bearing 13 can swing about the first swing center O1 in the width direction relative to the outer ring of the first bearing, thereby realizing the swing of the first component 121 about the first swing center O1 in the plane of rotation.

[0068] In this embodiment, the swing of the first component 121 relative to the first connecting shaft 113 can be converted into the swing between the inner ring and the outer ring of the first joint bearing 13, thus making the swing connection structure of the first component 121 and the first connecting shaft 113 simpler.

[0069] Furthermore, since a gap needs to be set between the connecting through hole 121a and the first connecting shaft 113 to ensure the swing space of the first component 121, the swing connection relationship between the first component 121 and the first connecting shaft 113 is realized by the first joint bearing 13. In this way, the connection of the first component 121 on the first connecting shaft 113 is more stable and reliable.

[0070] The first joint bearing 13 can withstand a large load. Depending on its type and structure, it can withstand radial load, axial load, or combined load of radial and axial loads, thus improving the reliability of the swing connection between the first component 121 and the first connecting shaft 113.

[0071] like Figure 3 and Figure 4 As shown, in some embodiments, the inner ring of the first spherical bearing 13 is positioned and engaged with the first connecting shaft 113 along its axial direction.

[0072] It should be noted that, in the embodiments of this application, the positioning and matching of the two along a certain direction means that the two will not produce relative displacement in this direction.

[0073] The specific manner in which the inner ring of the first spherical bearing 13 is positioned and engaged with the first connecting shaft 113 along its axial direction is not limited. For example, such as... Figure 3 and Figure 4 , Figure 6 and Figure 7 As shown, in some embodiments, the boom system 10 further includes two first limiting members 16, both of which are sleeved on the first connecting shaft 113 and spaced apart along the axial direction of the first connecting shaft 113. The inner ring of the first joint bearing 13 abuts against the two first limiting members 16 at both ends along the axial direction.

[0074] The type of the first limiting component 16 is not limited. For example, it can be a spacer, bearing housing, etc.

[0075] The two first limiting members 16 can respectively limit the inner ring of the first spherical bearing 13 at both ends along its axial direction. When installing the first spherical bearing 13, one first limiting member 16 can be first sleeved along the axial direction of the first connecting shaft 113, then the first spherical bearing 13 can be sleeved on the first connecting shaft 113, and finally the other first limiting member 16 can be sleeved on the first connecting shaft 113. This facilitates the installation of the first spherical bearing 13.

[0076] like Figure 3 and Figure 4 As shown, in some embodiments, the outer ring of the first spherical bearing 13 is positioned and engaged with the wall of the connecting through hole 121a along its axial direction.

[0077] The specific manner in which the outer ring of the first spherical bearing 13 is positioned and fitted with the wall of the connecting through hole 121a along its axial direction is not limited. For example, such as... Figure 3 and Figure 4 , Figure 6 and Figure 7As shown, in some embodiments, a first stepped surface 121b is provided on the wall of the connecting through hole 121a, and one end of the outer ring of the first joint bearing 13 along its axial direction abuts against the first stepped surface 121b. The boom system 10 also includes a second limiting member 17, which is provided on the wall of the connecting through hole 121a, and the other end of the outer ring of the first joint bearing 13 along its axial direction abuts against the second limiting member 17.

[0078] The type of the second limiting component 17 is not limited. For example, it can be a spacer, an outer sealing ring, etc.

[0079] Thus, the first stepped surface 121b and the second limiting member 17 can limit the outer ring of the first spherical bearing 13 along its axial direction at both ends on the wall of the connecting through hole 121a. At the same time, the first stepped surface 121b and the second limiting member 17 can facilitate the installation of the first spherical bearing 13.

[0080] like Figure 3 and Figure 5 As shown, in some embodiments, the telescopic arm 112 has connecting grooves 112b on the inner side of the wall on both sides along the width direction, and two second connecting shafts 122a are provided on the side wall of the second component 122. The two second connecting shafts 122a are respectively oscillatingly disposed in the two connecting grooves 112b.

[0081] Specifically, in some embodiments, the telescopic arm 112 is provided with a receiving cavity 112a, and connecting grooves 112b are formed on both sides of the cavity wall along the width direction of the telescopic arm 112. That is to say, the second component 122 in this embodiment of the application may be disposed inside the telescopic arm 112.

[0082] Of course, in other embodiments, the connecting groove 112b may also be on the outer wall of the telescopic arm 112, that is, the second component 122 is disposed on the outside of the telescopic arm 112.

[0083] In the embodiments of this application, the second component 122 is provided inside the telescopic arm 112 for illustrative purposes.

[0084] It is understandable that the outer contour dimension of the portion of the second connecting shaft 122a disposed within the connecting groove 112b is smaller than the dimension of the connecting groove 112b. That is, there is a gap between the second connecting shaft 122a and the groove wall of the connecting groove 112b. Thus, during the swinging of the second component 122 around the first swing center O1, the swinging space of the second connecting shaft 122a within the connecting groove 112b can be guaranteed.

[0085] During the extension and retraction of the telescopic arm 112, the second connecting shaft 122a contacts the groove wall of the connecting groove 112b along the axial direction of the telescopic arm 112, thereby pushing the telescopic arm 112 to move along its axial direction, so as to realize the extension and retraction of the telescopic arm 112 relative to the basic arm 111.

[0086] Both the first component 121 and the second connecting shaft 122a oscillate around the first swing center O1. That is, the movement trajectory of the second connecting shaft 122a within the connecting groove 112b is an arc. The second component 122 follows the swing of the first component 121, and the second component 122 and the first component 121 can be understood as a whole. That is, the second component 122 will not have radial displacement relative to the first component 121. Thus, the telescopic component 12 as a whole will not be subjected to radial load.

[0087] like Figures 3 to 5 As shown, in some embodiments, the boom system 10 further includes a slider 14 having a second swing center O2, at least one second connecting shaft 122a is disposed in a corresponding connecting groove 112b through the slider 14, and the second swing center O2 is located on the axis of the second connecting shaft 122a; the first member 121 swings about the first swing center O1 in the plane of rotation, so as to drive the slider 14 to swing about the first swing center O1 and the second swing center O2 in the plane of rotation in the corresponding connecting groove 112b respectively.

[0088] Specifically, the following examples illustrate the use of a sliding member 14 installed in a connecting groove 112b.

[0089] It is understandable that the movement trajectory of the second connecting shaft 122a within the connecting groove 112b is arc-shaped. Therefore, a certain gap needs to be set between the connecting groove 112b and the second connecting shaft 122a to accommodate the arc-shaped movement of the second connecting shaft 122a within the connecting groove 112b. Since the length of the first component 121 is generally relatively long, even if the swing angle of the first component 121 is small, the arc-shaped displacement generated by the second connecting shaft 122a will be relatively large relative to its position. Thus, the gap between the connecting groove 112b and the second connecting shaft 122a needs to be set relatively large. However, when the gap is large, during the extension and retraction of the telescopic arm 112, the second connecting shaft 122a needs to move a relatively large distance within the connecting groove 112b to contact the groove wall of the connecting groove 112b, thereby pushing the telescopic arm 112 to extend and retract. This results in slow extension and retraction feedback, and the second connecting shaft 122a impacting the groove wall of the connecting groove 112b at a long distance, leading to reliability issues.

[0090] In this embodiment, the slider 14 can fill part of the gap between the second connecting shaft 122a and the connecting groove 112b, thereby transmitting the force used to push the telescopic arm 112 to extend and retract. In this way, the extension and retraction efficiency of the telescopic arm 112 can be improved. At the same time, the slider 14 can swing in the plane of rotation around the first swing center O1 and the second swing center O2 in the connecting groove 112b, so that the reserved gap of the connecting groove 112b does not need to be too large.

[0091] For example, such as Figure 9 As shown, during the process of the second component 122 swinging around the first swing center O1, the slider 14 has an initial state, a critical state, and a final state.

[0092] Specifically, in its initial state, the slider 14 is described with a gap between at least one side of the slider 14 and the wall of the connecting groove 112b along the axial direction of the telescopic arm 112. During the swinging of the second member 122 around the first swing center O1, the slider 14 swings synchronously around the first swing center O1. When one side of the slider 14 contacts the wall of the connecting groove 112b, the slider 14 is in a critical state. The second member 122 continues to swing around the first swing center O1. At this time, under the action of the wall of the connecting groove 112b, the slider 14 swings around the second swing center O2 to its final state. Because the slider 14 can swing around the second swing center O2, the influence of the wall of the connecting groove 112b on the swinging of the second member 122 around the first swing center O1 is reduced.

[0093] It is understandable that, taking the counterclockwise rotation of the second component 122 around the first swing center O1 in the plane of rotation as an example, during the transition of the slider 14 from the critical state to the final state, the slider 14 swings clockwise around the second swing center O2. That is, the swing direction of the slider 14 around the first swing center O1 is opposite to the swing direction around the second swing center O2.

[0094] It should be noted that during the process of the slider 14 swinging around the second swing center O2 from the critical state to the final state, the position of the second swing center O2 is dynamically changing, that is, the second swing center O2 rotates counterclockwise around the first swing center. Specifically, as shown in the figure... Figure 9 As shown, in the initial state, the second swing center O2 is located at point M1; in the critical state, the second swing center O2 is located at point M2; and in the final state, the second swing center O2 is located at point M3.

[0095] The slider 14 swings around the first swing center O1 and the second swing center O2 respectively. Thus, a small gap exists between the connecting groove 112b and the slider 14 to allow the second connecting shaft 122a to swing at a sufficient angle around the first swing center O1. In this embodiment, with a fixed swing angle of the second connecting shaft 122a around the first swing center O1, the required size of the connecting groove 112b is smaller, and the gap between the connecting groove 112b and the slider 14 is smaller. This reduces the response time of the telescopic arm 112 during the extension and retraction of the second component 122, and simultaneously improves the reliability of the second component 122 in pushing the telescopic arm 112 to extend and retract.

[0096] It should be noted that when the first component 121 swings around the first swing center O1 in the variable amplitude plane, it can also drive the sliding component 14 to swing around the first swing center O1 and the second swing center O2 in the variable amplitude plane in the corresponding connecting groove 112b.

[0097] The oscillation mode of the slider 14 around the first oscillation center O1 and the second oscillation center O2 in the amplitude-changing plane can be referred to Figure 9 The swing trajectory of the middle slider 14 in the plane of rotation will not be described in detail here.

[0098] In other words, the required size of the connecting groove 112b in the variable amplitude plane can also be made smaller, thereby further reducing the size of the connecting groove 112b.

[0099] like Figures 3 to 5 As shown, in some embodiments, the boom system 10 further includes a second joint bearing, a connecting hole 14a is provided on the sliding member 14, the inner ring of the second joint bearing is sleeved on the second connecting shaft 122a, and the sliding member 14 is sleeved on the outer ring of the second joint bearing through the connecting hole 14a; the outer ring of the second joint bearing and the inner ring of the second joint bearing are spherically fitted, and the second swing center O2 overlaps with the axis of the second joint bearing.

[0100] The outer ring and inner ring of the second spherical plain bearing are spherically fitted. Therefore, one of the outer ring and inner ring of the second spherical plain bearing can swing relative to the other about the axis of the second spherical plain bearing. In other words, the outer ring of the second spherical plain bearing can swing about the second swing center O2 in the width direction relative to the inner ring of the first bearing, thereby realizing the swing of the sliding member 14 about the second swing center O2 in the plane of rotation.

[0101] In this embodiment, the swing of the slider 14 relative to the second connecting shaft 122a can be converted into the swing between the outer ring of the second joint bearing and the inner ring of the second joint bearing, thus making the swing connection structure of the slider 14 and the second connecting shaft 122a simpler.

[0102] Furthermore, since a gap needs to be set between the connecting hole 14a and the second connecting shaft 122a to ensure the swing space between the sliding member 14 and the second connecting shaft 122a, the swing connection between the sliding member 14 and the second connecting shaft 122a is realized by the second joint bearing. In this way, the connection of the sliding member 14 on the second connecting shaft 122a is more stable and reliable.

[0103] The second joint bearing can withstand a larger load. Depending on its type and structure, it can withstand radial load, axial load, or a combined load of radial and axial loads, thus improving the reliability of the swing connection between the sliding member 14 and the second connecting shaft 122a.

[0104] like Figure 3 and Figure 5 As shown, in some embodiments, the inner ring of the second spherical bearing is positioned and engaged with the second connecting shaft 122a along its axial direction.

[0105] The specific manner in which the inner ring of the second spherical plain bearing is positioned and engaged with the second connecting shaft 122a along its axial direction is not limited. For example, such as... Figure 3 , Figure 5 , Figure 6 and Figure 8 As shown, in some embodiments, the boom system 10 further includes two third limiting members 18, both of which are sleeved on the second connecting shaft 122a and spaced apart along the axial direction of the second connecting shaft 122a. The inner ring of the second joint bearing abuts against the two third limiting members 18 at both ends along the axial direction.

[0106] The type of the third limiting component 18 is not limited. For example, it can be a spacer, bearing housing, etc.

[0107] The two third limiting members 18 can respectively limit the inner ring of the second spherical bearing at both ends along its axial direction. When installing the second spherical bearing, one third limiting member 18 can be first sleeved along the axial direction of the second connecting shaft 122a, then the second spherical bearing can be sleeved on the second connecting shaft 122a, and finally the other third limiting member 18 can be sleeved on the second connecting shaft 122a. This facilitates the installation of the second spherical bearing.

[0108] like Figure 3 and Figure 5 As shown, in some embodiments, the outer ring of the second spherical bearing is positioned and fitted along its axial direction with the wall of the connecting hole 14a.

[0109] The specific manner in which the outer ring of the second spherical bearing is positioned and fitted along its axial direction with the wall of the connecting hole 14a is not limited. For example, such as... Figure 3 , Figure 5 , Figure 6 and Figure 8As shown, in some embodiments, a second stepped surface 14b is provided on the wall of the connecting hole 14a, and one end of the outer ring of the second joint bearing abuts against the second stepped surface 14b along its axial direction. The boom system 10 also includes a fourth limiting member 19, which is provided on the wall of the connecting hole 14a, and the other end of the outer ring of the second joint bearing abuts against the fourth limiting member 19 along its axial direction.

[0110] The type of the fourth limiting component 19 is not limited. For example, it can be a spacer, an outer sealing ring, etc.

[0111] Thus, the second stepped surface 14b and the fourth limiting member 19 can limit the outer ring of the second spherical plain bearing along its axial direction at both ends on the wall of the connecting hole 14a. At the same time, the second stepped surface 14b and the fourth limiting member 19 can facilitate the installation of the second spherical plain bearing.

[0112] like Figure 3 and Figure 6 As shown, in some embodiments, the number of sliders 14 is one, and one of the two second connecting shafts 122a is disposed in the corresponding connecting groove 112b through the slider 14.

[0113] The second component 122 can easily drive the telescopic arm 112 to extend and retract via a single slider 14. In other words, only one large connecting groove 112b needs to be provided, and the size of the other connecting groove 112b only needs to meet the swing space of the corresponding second connecting shaft 122a. Thus, the structure of the inner wall of the telescopic arm 112 is simpler. Since there are other components inside the telescopic arm 112, only one slider 14 is needed, which can save internal space of the telescopic arm 112.

[0114] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0115] The above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the protection scope of this application.

Claims

1. A boom system, characterized in that, include: The main body of the boom includes the basic boom and the telescopic boom; The telescopic component includes a first member connected to the base arm and a second member connected to the telescopic arm, the second member extending or retracting relative to the first member along its axial direction to drive the telescopic arm to extend or retract relative to the base arm; The first component also has a first swing center, and the first component can swing relative to the first swing center in a plane of rotation, and can drive the second component to swing relative to the first swing center in the plane of rotation. The boom system also includes a first joint bearing, the boom body also includes a first connecting shaft, the basic boom is provided with the first connecting shaft along its width direction, the first component is provided with a connecting through hole, the inner ring of the first joint bearing is sleeved on the first connecting shaft, the first component is sleeved on the outer ring of the first joint bearing through the connecting through hole, the outer ring of the first joint bearing and the inner ring of the first joint bearing are spherically fitted, and the first swing center overlaps with the axis of the first joint bearing. The telescopic arm has connecting grooves on the inner side of both sides of the wall along the width direction. The second component has two second connecting shafts on its side wall, and the two second connecting shafts are respectively oscillatingly disposed in the two connecting grooves. The boom system further includes a slider with a second swing center, at least one second connecting shaft is disposed in the corresponding connecting groove through the slider, the second swing center is located on the axis of the second connecting shaft, and the first component swings around the first swing center in the plane of rotation to drive the slider to swing around the first swing center and the second swing center in the plane of rotation in the corresponding connecting groove respectively. The boom system also includes a second joint bearing. The sliding member is provided with a connecting hole. The inner ring of the second joint bearing is sleeved on the second connecting shaft. The sliding member is sleeved on the outer ring of the second joint bearing through the connecting hole. The outer ring of the second joint bearing and the inner ring of the second joint bearing are in spherical fit. The second swing center overlaps with the axis of the second joint bearing.

2. The boom system according to claim 1, characterized in that, The end of the first component is connected to the basic arm, and the first swing center is located at the end of the first component.

3. The boom system according to claim 1, characterized in that, The inner ring of the first spherical plain bearing is positioned and fitted with the first connecting shaft along its axial direction; and / or, The outer ring of the first spherical bearing is positioned and fitted along its axial direction with the wall of the connecting through hole.

4. The boom system according to claim 1, characterized in that, The inner ring of the second spherical plain bearing is positioned and fitted with the second connecting shaft along its axial direction; and / or, The outer ring of the second spherical bearing is positioned and fitted along its axial direction with the wall of the connecting hole.

5. The boom system according to claim 1, characterized in that, The number of the sliding member is one, and one of the two second connecting shafts is disposed in the corresponding connecting groove through the sliding member.

6. An engineering vehicle, characterized in that, It includes a vehicle body and a boom system as described in any one of claims 1-5, wherein the boom system is mounted on the vehicle body.

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