Crank arm downward-folding arm frame structure and crank arm type lifting platform

Abstract

The utility model discloses a crank arm downward folding arm frame structure and a crank arm type lifting platform, the crank arm downward folding arm frame structure comprises a first folding arm, a second folding arm, a first sealing plate, a first folding plate and a second sealing plate, the first sealing plate, the second sealing plate and the first folding plate are fixed between the first folding arm and the second folding arm in a crossing mode, and the second folding arm is fixed between the first folding arm and the second folding arm. A first reinforcing piece and a second reinforcing piece are fixed between the first sealing plate and the second sealing plate, the two ends of the first folding plate extend out of the edge of the first sealing plate and the edge of the second sealing plate, and arc notches are formed in the positions, corresponding to the turning fillets of the first folding arm and the second folding arm, of the first sealing plate and the second sealing plate. According to the utility model, the stress state of the structure is improved, and the risk of cracking caused by alternate stress change when the crank arm downward folding arm frame structure is in contact with the limiting block is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of articulated arm lifting platforms, and more specifically, to a curved arm folding arm frame structure and a curved arm lifting platform. Background Art

[0002] Articulated arm lifting platforms are mainly used in construction, warehousing and logistics, industrial manufacturing and other fields to provide a safe and stable working platform for aerial operations. At present, the upper part of the articulated arm lifting platform is mainly driven by a multi-segment folding arm driven by a cylinder to adjust the lifting height. When it falls to the rest position, the lower folding arm located at the bottom approaches the bottom limit block and contacts it. Since the lower folding arm is welded with plates and pipes, its stress state changes when it contacts the limit block, resulting in cracking risks in welds at different parts under alternating stress states. In addition, there are problems in the existing assembly and welding process of the lower folding arm, such as difficulty in welding fillets and difficulty in ensuring welding quality under stress changes. Utility Model Content

[0003] In view of the above defects or improvement needs of the prior art, the utility model provides a curved arm lower folding arm frame structure, which can avoid the risk of cracking caused by the contact between the lower folding arm and the limit block.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a curved arm lower folding arm frame structure, including a first folding arm and a second folding arm extending longitudinally, a first closing plate, a first folding plate, and a second closing plate. The first closing plate, the second closing plate and the first folding plate are all fixed across the first folding arm and the second folding arm. The first closing plate and the second closing plate are fixedly connected by a reinforcement member. The two ends of the first folding plate extend beyond the edges of the first closing plate and the second closing plate. Arc notches are arranged on the first closing plate and the second closing plate, and the arc notches are arranged at the corresponding positions of the turning corners of the first folding arm and the second folding arm.

[0005] During operation, when the upper structure is unfolded or folded, the curved arm lower folding arm frame structure is separated from or contacted with the limit block arranged on the turntable, and the stress state of the curved arm lower folding arm frame structure changes. By extending the two ends of the first folding plate, a covering structure is formed for the first closing plate and the second closing plate, and the tensile force at the welding position between the first folding plate and the closing plate is changed to a compressive force form, thereby improving the stress state of the structure and solving the problem of cracking of the curved arm lower folding arm frame structure during the stress alternation process.

[0006] Therefore, arc notches are arranged on the first sealing plate and the second sealing plate, and the arc notches are arranged at the corresponding positions of the turning corners of the first folding arm and the second folding arm, so as to ensure that the connection between the first sealing plate, the second sealing plate and the first folding arm and the second folding arm is a straight weld, thereby reducing the difficulty of the welding process.

[0007] Furthermore, the first folding plate is provided with extension portions extending in the longitudinal direction at both ends thereof, so as to increase the connection length between the first folding plate and the first folding arm and the second folding arm.

[0008] Furthermore, the ends of the extension portion are rounded to reduce stress concentration at the connection between the first folding plate and the first folding arm and the second folding arm.

[0009] Furthermore, horizontal parts are arranged on both sides of the first folding plate, and the plane areas formed by the horizontal parts are respectively fitted and fixed to the first folding arm and the second folding arm, thereby increasing the connection area between the two.

[0010] Based on the same inventive concept, it includes a first folding arm and a second folding arm extending longitudinally, a first sealing plate, a first folding plate, and a second sealing plate. The first sealing plate, the second sealing plate and the first folding plate are all fixed across the first folding arm and the second folding arm, and the first sealing plate and the second sealing plate are fixed by a reinforcement member; both ends of the first folding plate are closed and fixed by the first sealing plate and the second sealing plate, and second folding plates are respectively fixed between the first folding arm and the first sealing plate and between the second folding arm and the first sealing plate.

[0011] The second folding plate is welded and fixed between the first folding arm, the second folding arm and the first sealing plate to enhance the overall structural strength and prevent the folding arm frame structure under the curved arm from cracking when it contacts the limit block.

[0012] Furthermore, the second folding plate includes a first bending portion and a second bending portion, the first bending portion is fixedly connected to the side walls of the first folding arm and the second folding arm, and the second bending portion is fixedly connected to the first sealing plate.

[0013] Furthermore, the reinforcement member includes a first reinforcement member and a second reinforcement member; an arc plate is fixed between the first reinforcement member and the second reinforcement member.

[0014] Furthermore, a first connecting member is fixed between the first reinforcement member and the first folding arm, and a second connecting member is fixed between the second reinforcement member and the second folding arm, so as to strengthen the strength of the folding arm frame structure under the curved arm.

[0015] Furthermore, notches are provided on the first sealing plate and the second sealing plate, and the reinforcement is inserted and fixed in the notches.

[0016] According to another aspect of the utility model, a crank arm type lifting platform is also provided, which includes an upper structure, a turntable and a limit block, and also includes the crank arm lower folding arm frame structure. The upper structure is connected to the turntable through the crank arm lower folding arm frame structure, and the limit block is arranged on the turntable at the contact point with the crank arm lower folding arm frame structure. During the expansion or contraction of the upper structure, the crank arm lower folding arm frame structure separates from or contacts the limit block, and the stress state of the crank arm lower folding arm frame structure changes.

[0017] In general, the above technical solutions conceived by the utility model can achieve the following beneficial effects compared with the prior art:

[0018] (1) The utility model provides a curved arm lower folding arm frame structure, in which both ends of the first folding plate extend outward from the contact portion with the sealing plate to form a covering structure, and the tensile force at the welding position between the first folding plate and the sealing plate is changed to a compressive force, thereby improving the stress state of the structure.

[0019] (2) The utility model provides a folding arm frame structure under a curved arm, in which the groove of the folding arm cover plate is set as a straight groove, and an arc notch is set at the rounded corner welding place between the cover plate and the folding arm frame to avoid the generation of an arc segment groove. The manufacturing process is simple and the cost is reduced, and the problems of difficult welding, difficult quality assurance, and easy cracking at the rounded corner of the cover plate and the folding arm frame are solved.

[0020] (3) The utility model provides a folding arm frame structure under a curved arm, in which the two ends of the first folding plate and the folding arm frame are extended to form an extension portion, thereby increasing the length of the straight weld and optimizing the rounded corners at the end of the extension portion to avoid welding stress concentration and transfer the stress to the structural base material.

[0021] (4) The utility model provides a structure of a folding arm frame under a curved arm, in which a horizontal portion is added to the first folding plate. The structure can be formed by adding only two bending processes. The horizontal portion fits with the bottom plane of the folding arm frame to increase the contact area, thus avoiding the difficulty in welding the rounded corners of the first folding plate and the folding arm frame.

[0022] (5) The utility model provides a folding arm frame structure under a curved arm, which adopts a first sealing plate to seal the two ends of the first folding plate, and an additional second folding plate. The second folding plate includes two bent portions, which are respectively welded to the side wall of the folding arm frame and the first sealing plate, so as to transfer the structural force to the second folding plate, thereby avoiding the risk of cracking caused by stress concentration and alternating changes in the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0024] Figure 2 for Figure 1 A local enlarged view of point A;

[0025] Figure 3 This is a schematic diagram of the structure of the first folding plate in the first embodiment of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the second embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the first folding plate in the second embodiment of the utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the third embodiment of the present utility model;

[0029] Figure 7 This is a schematic diagram of the structure of the second folding plate in the third embodiment of the present utility model;

[0030] Figure 8 This is a schematic diagram of the structure of a crank arm lifting platform.

[0031] In all the drawings, the same reference numerals represent the same technical features, specifically: 1. arm frame of folding arm mechanism; 2. main arm cylinder; 3. leveling cylinder; 4. upper connector; 5. upper folding arm; 6. folding arm cylinder; 7. lower connecting rod; 8. turntable; 9. limit block; 10. lower folding arm; 11. pull rod; 12. lower connector; 13. upper connecting rod; 1001. folding arm frame; 1002. first closing plate; 1003. reinforcement; 1004. arc plate; 1005. first folding plate; 1006, second closing plate; 1007, connecting member; 1008, bushing; 1009, second folding plate; 10011, first folding arm; 10012, second folding arm; 10021, arc notch; 10051, extension portion; 10052, horizontal portion; 10091, first bending portion; 10092, second bending portion; 10031, first reinforcement member; 10032, second reinforcement member; 10071, first connecting member; 10072, second connecting member. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] like Figure 1-Figure 8As shown, a crank arm lower folding arm frame structure provided in this embodiment is applied to a crank arm lifting platform, wherein the lifting platform comprises a main arm 1, a main oil cylinder 2, a leveling oil cylinder 3, an upper connector 4, an upper folding arm 5, a folding arm oil cylinder 6, a lower connecting rod 7, a turntable 8, a limit block 9, a lower folding arm 10, a pull rod 11, a lower connector 12 and an upper connecting rod 13. The main arm 1 is arranged at the top of the lifting platform, the main arm oil cylinder 2 is hinged to the middle part of the driving main arm 1, and the main arm 1 is driven to rise and fall to change the range of motion of its end portion. The leveling oil cylinder 3 is supported at the tail of the main arm 1 and is used for leveling the main arm 1 and other upper working devices. The upper connector 4 is connected to the arm frame 1, the main arm oil cylinder 2, the upper leveling oil cylinder 3, the upper folding arm 5, and the upper connecting rod 13 through a pin shaft, and the lower connector 12 is connected to the upper folding arm 5, the upper connecting rod 13, the folding arm oil cylinder 6, the pull rod 11, and the lower connecting rod through a pin shaft. 7. The lower folding arm 10 is connected to form an integral upper structure. The turntable 8 is connected to the lower connecting rod 7 and the lower folding arm 8 through a pin shaft. The turntable 8 serves as the installation base of the upper structure. The upper structure is connected to the turntable 8 through a curved arm lower folding arm frame structure, that is, the lower folding arm 10 is connected to the turntable 8; during the expansion or contraction of the upper structure, the lower folding arm 10 is connected to the upper folding arm 5 through a pull rod 11, and the two ends of the folding arm cylinder 6 are respectively connected to the upper folding arm 5 and the lower connector 12. The folding arm cylinder 6 is used to drive the folding arm 5 to expand and fold. At the end of folding, the lower folding arm 10 falls on the limit block 9. The contact and separation of the lower folding arm 10 and the limit block 9 will cause the stress state of part of the structure of the lower folding arm 10 to change. In order to reduce the risk of cracking of the lower folding arm 10 during the contact process, ensure the welding quality and reduce the processing difficulty, a variety of structural forms of the lower folding arm 10 are proposed.

[0034] like Figure 1 and Figure 2As shown, the lower folding arm 10 includes a folding arm frame 1001, a first closing plate 1002, a reinforcement member 1003, an arc plate 1004, a first folding plate 1005, a second closing plate 1006, a connecting member 1007, and a shaft sleeve 1008, which are welded by the above structure. It should be pointed out that the "longitudinal direction" mentioned in the text refers to the direction parallel to the long side of the folding arm frame 1001, the "transverse direction" and "cross-over direction" refer to the direction perpendicular to the "longitudinal direction", the "end" and "two ends" correspond to the "longitudinal direction", and the "side" and "both sides" correspond to the "transverse direction"; wherein, the folding arm 10 The arm frame 1001 includes a first folding arm 10011 and a second folding arm 10012 arranged in parallel. The first sealing plate 1002, the second sealing plate 1006 and the first folding plate 1005 are all arch structures arranged across the folding arm frame 1001 to form the main body of the lower folding arm 10. Specifically, the first sealing plate 1002 and the second sealing plate 1006 are arranged in parallel, and both are welded and fixed between the first folding arm 10011 and the second folding arm 10012. The first folding plate 1005 is located between the first sealing plate 1002 and the second sealing plate 1006. 06 are respectively welded and fixed to the two ends of the first folding plate 1005; the reinforcement member 1003 includes a first reinforcement member 10031 and a second reinforcement member 10032, and notches are set on the first sealing plate 1002 and the second sealing plate 1006. The first reinforcement member 10031 and the second reinforcement member 10032 are respectively inserted and positioned in the notches, and are welded and fixed to the first sealing plate 1002 and the second sealing plate 1006; the arc plate 1004 is welded on the first reinforcement member 10031 and the second reinforcement member 10032 on both sides, and preferably, the arc plate 1004 adopts an arch structure; the connecting member 10 07 includes a first connecting member 10071 and a second connecting member 10072. The first connecting member 10071 is welded and fixed between the first reinforcement member 10031 and the first folding arm 10011, and the second connecting member 10072 is welded and fixed between the second reinforcement member 10032 and the second folding arm 10012. The connecting member 1007 is used to strengthen the structural strength of the reinforcement member 1003 and the folding arm frame 1001. Furthermore, the bushings 1008 are arranged in pairs at both ends of the first folding arm 10011 and the second folding arm 10012, and are used to connect the folding arm frame 1001 with other upper structures.

[0035] Preferably, the first reinforcement member 10031 and the second reinforcement member 10032 may be in the form of a plate, a box, an arch, etc., and the two may be arranged in parallel along the longitudinal direction, or be fixed to the first sealing plate 1002 and the second sealing plate 1006 in a straddling manner at a certain angle.

[0036] Embodiment 1

[0037] like Figure 1-Figure 4As shown, this embodiment provides a first structural form of the lower folding arm 10, wherein the first folding plate 1005 is enclosed on the outside of the first sealing plate 1002 and the second sealing plate 1006, that is, the two ends of the first folding plate 1005 exceed the edges of the first sealing plate 1002 and the second sealing plate 1006 and extend a certain distance. When the folding arm frame 1001 contacts the limit block 9, the force form of the welding part between the first sealing plate 1002 and the first folding plate 1005 is pressure. The above-mentioned form of the first folding plate 1005 avoids the risk of weld cracking; further, since the first folding plate 1005 extends a certain distance outward from the edges of the first sealing plate 1002 and the second sealing plate 1006, the first folding plate 1005 is not interfered by the two sealing plates, and at both ends of the connecting line between the side of the first folding plate 1005 and the folding arm frame 1001, extension parts 10051 extending along the folding arm frame 1001 are provided, thereby extending the first folding plate 1005 and the folding arm frame 1001. The weld length is 100, and the rounded corners are optimized at the end of the extension part 10051 to avoid welding stress concentration, reasonably transfer stress to the structural base material, and reduce the risk of welding cracking; further, the first folding arm 10011 and the second folding arm 10012 can adopt rectangular tubes or other structural parts. When the contact surfaces of the two with the first sealing plate 1002, the first folding plate 1005, the second sealing plate 1006, and the connecting member 1007 are special-shaped surfaces, the edges of the above structures should be adapted to the special-shaped surfaces; further, arc notches 10021 are set at the corresponding positions of the first sealing plate 1002, the second sealing plate 1006 and the turning corners of the inner wall of the folding arm frame 1001 to ensure that the connection between the first sealing plate 1002, the second sealing plate 1006 and the folding arm frame 1001 is a straight weld, avoiding the problem of arc welding at the rounded corners of the above two sealing plates and the folding arm frame 1001, which makes it difficult to ensure the welding quality, and reduces the risk of cracking.

[0038] Embodiment 2

[0039] like Figure 5 and Figure 6 As shown, a second structural form of the lower folding arm 10 is provided. The difference between this embodiment and the first embodiment is that the first folding plate 1005 of this embodiment also includes a horizontal portion 10052. By changing the bending form of the first folding plate 1005, it can be formed by adding two bending processes. The horizontal portion 10052 is arranged on both sides of the first folding plate 1005. Specifically, two planar areas are formed at the connection between the first folding plate 1005 and the first folding arm 10011 and the second folding arm 10012, which are used for respectively fitting and welding with the first folding arm 10011 and the second folding arm 10012, thereby increasing the contact area and solving the problem of difficulty in welding the fillet of the edge of the first folding plate 1005 and the folding arm frame 1001. Preferably, the contact surface between the first folding arm 10011 and the second folding arm 10012 and the horizontal portion 10052 should adopt a planar structure, which is conducive to welding and fixing, and reduces the process difficulty of bending the first folding plate 1005 to form the horizontal portion 10052.

[0040] Embodiment 3

[0041] like Figure 7 and Figure 8 As shown, a third structural form of the lower folding arm 10 is provided. In this embodiment, both ends of the first folding plate 1005 are closed and fixed by the first sealing plate 1002 and the second sealing plate 1006, that is, both ends of the first folding plate 1005 do not exceed the end planes of the first sealing plate 1002 and the second sealing plate 1006, and a second folding plate 1009 is added between the folding arm frame 1001 and the first sealing plate 1002. The second folding plate 1009 includes a first bending portion 10091 and a second bending portion 10092. The first bending portion 10091 is attached to the inner side wall of the folding arm frame 1001. And welded and fixed, preferably, a notch should be set on the first bending part 10091 to make way for the shaft sleeve 1008 at the end of the folding arm frame 1001, and the contact surface between the first folding arm 10011 and the second folding arm 10012 and the first bending part 10091 should adopt a flat structure to reduce the difficulty of welding; the side of the second bending part 10092 is welded and fixed to the surface of the first sealing plate 1002, successfully transferring the structural force to the body of the second folding plate 1009, and the risk of cracking caused by stress concentration and alternating changes in the weld seam solves the problem of welding cracking. It should be pointed out that the description of "welding fixation" in the above embodiment is only the preferred connection method in this embodiment. According to the material type of each component and the overall strength requirements, other fixing methods such as adhesive fixation and bolt fixation can be used as replacement or superposition solutions.

[0042] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A curved arm folding arm structure, characterized in that: The invention comprises a first folding arm (10011) and a second folding arm (10012) extending longitudinally, a first sealing plate (1002), a first folding plate (1005), and a second sealing plate (1006); the first sealing plate (1002), the second sealing plate (1006), and the first folding plate (1005) are all fixed across the first folding arm (10011) and the second folding arm (10012); the first sealing plate (1002) and the second sealing plate (1006) are fixedly connected via a reinforcing member; both ends of the first folding plate (1005) extend beyond the edges of the first sealing plate (1002) and the second sealing plate (1006); arc notches (10021) are provided on the first sealing plate (1002) and the second sealing plate (1006); the arc notches (10021) are provided at the corresponding positions of the turning corners of the first folding arm (10011) and the second folding arm (10012).

2. According to the curved arm folding arm structure of claim 1, it is characterized in that: The first folding plate (1005) is provided with extension portions (10051) extending in the longitudinal direction at both ends.

3. The curved arm folding arm structure according to claim 2, characterized in that: The end of the extension portion (10051) is rounded.

4. The curved arm folding arm structure according to claim 1, characterized in that: Horizontal portions (10052) are provided on both sides of the first folding plate (1005), and the plane areas formed by the horizontal portions (10052) are respectively fitted and fixed to the first folding arm (10011) and the second folding arm (10012).

5. A curved arm folding arm structure, characterized in that: It comprises a first folding arm (10011) and a second folding arm (10012) extending longitudinally, a first sealing plate (1002), a first folding plate (1005), and a second sealing plate (1006); the first sealing plate (1002), the second sealing plate (1006), and the first folding plate (1005) are all fixed across the first folding arm (10011) and the second folding arm (10012); the first sealing plate (1002) and the second sealing plate (1006) are fixed by a reinforcing member; both ends of the first folding plate (1005) are closed and fixed by the first sealing plate (1002) and the second sealing plate (1006); the second folding plate (1009) is fixed between the first folding arm (10011) and the first sealing plate (1002), and between the second folding arm (10012) and the first sealing plate (1002), respectively.

6. The curved arm folding arm structure according to claim 5, characterized in that: The second folding plate (1009) includes a first bending portion (10091) and a second bending portion (10092), wherein the first bending portion (10091) is fixedly connected to the side walls of the first folding arm (10011) and the second folding arm (10012), and the second bending portion (10092) is fixedly connected to the first sealing plate (1002).

7. A crank arm folding arm structure according to any one of claims 1 to 6, characterized in that: The reinforcement member comprises a first reinforcement member (10031) and a second reinforcement member (10032); an arc plate (1004) is fixed between the first reinforcement member (10031) and the second reinforcement member (10032).

8. The curved arm folding arm structure according to claim 7, characterized in that: A first connecting member (10071) is fixed between the first reinforcing member (10031) and the first folding arm (10011), and a second connecting member (10072) is fixed between the second reinforcing member (10032) and the second folding arm (10012).

9. A crank arm folding arm structure according to any one of claims 1 to 6, characterized in that: The first sealing plate (1002) and the second sealing plate (1006) are provided with slots, and the reinforcement is inserted and fixed in the slots.

10. A crank-type lifting platform, comprising an upper structure, a turntable (8) and a limit block (9), characterized in that: The upper structure is connected to the turntable (8) via a curved arm lower folding arm frame structure as described in any one of claims 1 to 9, and the limit block (9) is arranged on the turntable (8) at a position where it contacts the curved arm lower folding arm frame structure. During the unfolding or folding process of the upper structure, the curved arm lower folding arm frame structure is separated from or in contact with the limit block (9).

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