Telescopic device

Abstract

The utility model discloses a telescopic device, and relates to the technical field of crank arm type aerial work platforms. The telescopic inner arm is movably arranged in the telescopic outer arm; the telescopic oil cylinder comprises a cylinder barrel and a piston rod which are arranged along a central shaft of the telescopic inner arm, and the piston rod is arranged in the cylinder barrel and telescopically moves relative to the cylinder barrel; the mounting frame is arranged on the cylinder barrel, and the four peripheral parts of the mounting frame are distributed in parallel with the four inner wall surfaces of the telescopic inner arm respectively; and the damping parts are arranged on the four peripheral parts correspondingly, in the initial state, the damping parts make contact with the telescopic inner arm or gaps are formed between the damping parts and the telescopic inner arm, and the damping parts are used for making contact with the telescopic inner arm when the telescopic oil cylinder shakes so as to limit the position of the telescopic oil cylinder. The use effect of the telescopic oil cylinder of the crank arm type aerial work platform can be improved, and the problem that the telescopic oil cylinder is prone to deformation in the use process can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of articulated boom aerial work platforms, and more specifically to a telescopic device. Background Art

[0002] In the prior art, the telescopic cylinders of articulated boom aerial work platforms are all fixed at both ends, and the piston rod end and the cylinder end are limited by pins. The telescopic arm components of articulated boom aerial work platforms usually need to be designed to be lightweight, and the weight of the telescopic cylinder needs to be designed to be as light as possible. For example, the weight of the telescopic cylinder can be reduced by reducing the rod diameter of the piston rod and the barrel diameter of the cylinder. However, this will result in the telescopic cylinder being lightweight while sacrificing some of its strength. Under some working conditions, after the telescopic cylinder is extended, due to the increase in the slenderness ratio of the telescopic cylinder, the probability of the telescopic cylinder being in an unstable state increases, causing the telescopic cylinder to shake and deform, and then causing irreversible plastic deformation of the telescopic cylinder, greatly shortening the service life of the telescopic cylinder, and also posing serious safety hazards.

[0003] In summary, how to improve the use effect of the telescopic cylinder of the articulated boom aerial work platform and avoid its deformation is a problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a telescopic device, which can improve the use effect of the telescopic cylinder of the articulated boom aerial work platform and reduce the problem that the telescopic cylinder is easily deformed during use.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A telescopic device, comprising:

[0007] Telescopic outer arm;

[0008] a telescopic inner arm, which is movably disposed within the telescopic outer arm;

[0009] A telescopic oil cylinder, comprising a cylinder barrel and a piston rod arranged along the central axis of the telescopic inner arm, wherein the piston rod is arranged in the cylinder barrel and telescopically moves relative to the cylinder barrel;

[0010] A mounting frame, which is arranged on the cylinder, and four peripheral portions of the mounting frame are respectively distributed parallel to four inner wall surfaces of the telescopic inner arm;

[0011] The shock absorbing member is respectively arranged on the four peripheral parts. In the initial state, the shock absorbing member and the telescopic inner arm are in contact or have a gap. The shock absorbing member is used to contact the telescopic inner arm when the telescopic cylinder shakes to limit the position of the telescopic cylinder.

[0012] In one embodiment, the mounting bracket is provided at the end of the cylinder barrel close to the piston rod.

[0013] In one embodiment, the mounting frame includes a bottom plate disposed on the cylinder barrel and four peripheral portions, the bottom plate is provided with a through hole for passing through the cylinder barrel, and the four peripheral portions are respectively disposed around the bottom plate.

[0014] In one embodiment, the four peripheral portions and the bottom plate are an integral structural component.

[0015] In one embodiment, the shock absorbing member includes a bearing seat and a pulley, two bearing seats are symmetrically provided on each of the peripheral portions, and two ends of the pulley are respectively connected to the bearing seats through a pin shaft.

[0016] In one embodiment, the pulley comprises a nylon material.

[0017] In one embodiment, the shock absorbing member comprises a sliding block detachably disposed on the peripheral portion.

[0018] In one embodiment, at least one adjustment pad is sandwiched between the peripheral portion and the slider.

[0019] In one embodiment, the slider comprises a nylon material.

[0020] In one embodiment, limiting blocks are correspondingly provided on both sides of the bottom of the sliding block and on both sides of the top of the peripheral portion.

[0021] When using the telescopic device provided by the utility model, a mounting frame is arranged on the cylinder barrel, and the four peripheries of the mounting frame are respectively distributed in parallel with the four inner wall surfaces of the telescopic inner arm, and shock-absorbing parts are arranged on the four peripheries of the mounting frame. In the initial state, the shock-absorbing part and the telescopic inner arm are in contact or have a gap. After the piston rod of the telescopic oil cylinder is extended, the telescopic oil cylinder is prone to instability due to the increase in the slenderness ratio of the telescopic oil cylinder, causing the telescopic oil cylinder to shake and deform. At this time, since a shock-absorbing part is arranged between the telescopic inner arm and the cylinder barrel, the shock-absorbing part can contact the telescopic inner arm when the telescopic oil cylinder shakes, so as to limit the position of the telescopic oil cylinder, reduce the shaking and deformation of the telescopic oil cylinder, and improve the use effect of the telescopic oil cylinder of the articulated boom aerial work platform.

[0022] By adding a mounting frame to the cylinder barrel of the telescopic cylinder, the telescopic cylinder can be transformed from the original two-end constraints to two-end constraints plus a new constraint (the position where the shock absorber is provided is the new constraint position, and the new constraint position is located between the two-end constraints, which helps to improve the structural stability of the telescopic cylinder), so that the telescopic movement of the telescopic cylinder is more stable. Therefore, a cylinder barrel with a smaller diameter and a piston rod with a smaller rod diameter can be selected to achieve a lightweight design of the telescopic cylinder, save costs, and improve the safety performance of the telescopic cylinder.

[0023] In summary, the telescopic device provided by the utility model can improve the use effect of the telescopic cylinder of the articulated boom aerial work platform and reduce the problem that the telescopic cylinder is easily deformed during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 This is a schematic structural diagram of a first embodiment of the telescopic device provided by the utility model;

[0026] Figure 2 It is a side view of the telescopic device without the telescopic outer arm;

[0027] Figure 3 It is a schematic diagram of the structure of the pulley, mounting frame, cylinder and piston rod;

[0028] Figure 4 It is a schematic structural diagram of a second embodiment of the telescopic device;

[0029] Figure 5 It is a side view of the telescopic device without the telescopic outer arm;

[0030] Figure 6 It is a schematic diagram of the structure of the slider, mounting frame, cylinder and piston rod.

[0031] Reference numerals:

[0032] 1-telescopic outer arm; 2-telescopic inner arm; 3-cylinder; 4-shock absorber; 41-pulley; 42-slider; 43-adjusting pad; 44-limiting block; 45-bolt; 5-piston rod; 6-pin shaft; 7-bearing seat; 8-screw; 9-mounting frame; 91-bottom plate; 92-periphery. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The core of the utility model is to provide a telescopic device, which can improve the use effect of the telescopic cylinder of the articulated boom aerial work platform and reduce the problem that the telescopic cylinder is easy to deform during use.

[0035] Please refer to Figures 1 to 6 .

[0036] This specific embodiment provides a telescopic device, including:

[0037] Telescopic outer arm 1;

[0038] The telescopic inner arm 2 is movably arranged in the telescopic outer arm 1;

[0039] The telescopic oil cylinder comprises a cylinder barrel 3 and a piston rod 5 arranged along the central axis of the telescopic inner arm 2. The piston rod 5 is arranged in the cylinder barrel 3 and moves telescopically relative to the cylinder barrel 3.

[0040] A mounting frame 9 is provided on the cylinder 3, and four peripheral portions 92 of the mounting frame 9 are respectively distributed parallel to four inner wall surfaces of the telescopic inner arm 2;

[0041] The shock absorbing member 4 is respectively arranged on the four peripheral parts 92. In the initial state, the shock absorbing member 4 and the telescopic inner arm 2 are in contact or have a gap. The shock absorbing member 4 is used to contact the telescopic inner arm 2 when the telescopic cylinder shakes to limit the position of the telescopic cylinder.

[0042] It should be noted that the cross-sections of the telescopic outer arm 1 and the telescopic inner arm 2 are both rectangular structures. The shock absorber 4 and the telescopic inner arm 2 are in contact or provided with a gap in order to better define the position of the telescopic oil cylinder and provide a new constraint point for the telescopic oil cylinder in addition to the constraint points at both ends, so that the telescopic oil cylinder is improved from the constraint at both ends to the constraint at three points, effectively reducing the deformation of the telescopic oil cylinder.

[0043] Preferably, a gap can be provided between the surface of the shock absorber 4 and the inner wall surface of the telescopic inner arm 2. The specific gap size can be determined in actual use. The gap size can reduce the wear between the shock absorber 4 and the inner wall surface, and also enable the shock absorber 4 to contact the inner wall surface in time when the telescopic cylinder shakes or rocks, so as to limit the position of the telescopic cylinder and reduce deformation.

[0044] In actual use, the shape, structure, size, material, position, etc. of the telescopic outer arm 1, the telescopic inner arm 2, the telescopic oil cylinder, the mounting frame 9 and the shock absorber 4 can be determined according to actual conditions and actual needs.

[0045] When using the telescopic device provided by the utility model, a mounting frame 9 is arranged on the cylinder barrel 3, and the four peripheral portions 92 of the mounting frame 9 are respectively distributed in parallel with the four inner wall surfaces of the telescopic inner arm 2, and a shock absorber 4 is arranged on each of the four peripheral portions 92 of the mounting frame 9. In the initial state, the shock absorber 4 and the telescopic inner arm 2 are in contact or have a gap. After the piston rod 5 of the telescopic oil cylinder is extended, the telescopic oil cylinder is prone to instability due to the increase in the slenderness ratio of the telescopic oil cylinder, causing the telescopic oil cylinder to shake and deform. At this time, since the shock absorber 4 is arranged between the telescopic inner arm 2 and the cylinder barrel 3, the shock absorber 4 can contact the telescopic inner arm 2 when the telescopic oil cylinder shakes, so as to limit the position of the telescopic oil cylinder, reduce the shaking and deformation of the telescopic oil cylinder, and improve the use effect of the telescopic oil cylinder of the articulated boom aerial work platform.

[0046] By adding a mounting frame 9 to the cylinder barrel 3 of the telescopic cylinder, the telescopic cylinder can be transformed from the original two-end constraints to two-end constraints plus a new constraint (the position where the shock absorber 4 is provided is the new constraint position, and the new constraint position is located between the two-end constraints, which helps to improve the structural stability of the telescopic cylinder), so that the telescopic movement of the telescopic cylinder is more stable. Therefore, a cylinder barrel 3 with a smaller barrel diameter and a piston rod 5 with a smaller rod diameter can be selected to achieve a lightweight design of the telescopic cylinder, save costs, and improve the safety performance of the telescopic cylinder.

[0047] In summary, the telescopic device provided by the utility model can improve the use effect of the telescopic cylinder of the articulated boom aerial work platform and reduce the problem that the telescopic cylinder is easily deformed during use.

[0048] In one embodiment, a mounting bracket 9 is provided at the end of the cylinder 3 close to the piston rod 5 .

[0049] It should be noted that when the piston rod 5 is extended to the farthest position, the length of the piston rod 5 is close to the length of the cylinder 3. By providing a mounting bracket 9 at the end of the cylinder 3 close to the piston rod 5, when the piston rod 5 is extended to the farthest position (in this case, deformation of the telescopic cylinder is most likely to occur), the mounting bracket 9 is equivalent to the middle end of the entire telescopic cylinder, that is, the newly added limit point is located at the middle end of the telescopic cylinder, which is more conducive to ensuring the structural stability of the telescopic cylinder and reducing deformation.

[0050] That is, by adding a mounting frame 9 at the end of the cylinder 3, the telescopic oil cylinder can be transformed from the original two-end constraint to the two-end constraint plus an intermediate constraint, making the structure of the telescopic oil cylinder more stable. At the same time, the design of the nylon pulley 41 will prevent the fixing screw 8 from being cut by shear force. Therefore, a telescopic oil cylinder with a smaller cylinder diameter and piston rod diameter can be selected to achieve a lightweight design, save costs, and improve safety performance.

[0051] In one embodiment, the mounting frame 9 includes a bottom plate 91 and four peripheral portions 92 disposed on the cylinder barrel 3 . The bottom plate 91 is provided with a through hole for passing through the cylinder barrel 3 . The four peripheral portions 92 are respectively disposed around the bottom plate 91 .

[0052] In one embodiment, the four peripheral portions 92 and the bottom plate 91 are an integral structure.

[0053] It should be noted that the mounting frame 9 can be formed by bending a thick plate and fixed to the end of the cylinder 3 by welding. The mounting frame 9 and the cylinder 3 are rigidly connected and can be integrated to fix the position of the shock absorber 4 on the mounting frame 9. The bottom plate 91 is connected to the cylinder 3, and the four peripheral portions 92 are respectively distributed parallel to the inner wall surface of the telescopic inner arm 2 to ensure that the four shock absorbers 4 are respectively in contact with the inner wall surface of the telescopic inner arm 2 or have a slight gap. Therefore, when the telescopic oil cylinder shakes, the shock absorber 4 can effectively limit the position of the telescopic oil cylinder and reduce the deformation of the telescopic oil cylinder.

[0054] In one embodiment, the shock absorber 4 includes a bearing seat 7 and a pulley 41. Two bearing seats 7 are symmetrically arranged on each peripheral portion 92. The two ends of the pulley 41 are connected to the bearing seat 7 through a pin shaft 6, respectively. Figure 2 and Figure 3 Among them, the bearing seat 7 can be fixed on the periphery 92 of the mounting frame 9 by means of screws 8, and the pulley 41 can be installed between the two bearing seats 7 by means of the pin 6, so that the pulley 41 can roll smoothly.

[0055] It should be noted that when the telescopic oil cylinder is running to drive the piston rod 5 to extend and retract relative to the cylinder barrel 3, the piston rod 5 can drive the telescopic inner arm 2 to extend and retract synchronously (such as Figure 4 As shown, the end of the piston rod 5 is connected to the telescopic inner arm 2) so that the telescopic inner arm 2 can telescope relative to the telescopic outer arm 1. During the telescopic inner arm 2 telescopic process, the pulley 41 can contact and act on the telescopic inner arm 2 to control the position of the telescopic cylinder and reduce the vibration and deformation of the telescopic cylinder. In addition, the pulley 41 contacts the telescopic inner arm 2 in the form of rolling friction, which can not only increase the service life of the pulley 41, but also reduce the noise. The pulley 41 contacts the telescopic inner arm 2 in the form of sliding, and the friction force generated along the direction of movement is small, so that the shear force on the screw 8 is very small, and there is no risk of shearing the screw 8, so as to increase the service life of the device.

[0056] In one embodiment, the pulley 41 includes a nylon material, so that the pulley 41 can roll smoothly relative to the telescopic inner arm 2, and the wear resistance and service life of the pulley 41 can be ensured, and the nylon pulley 41 will not cause damage to the telescopic inner arm 2. Of course, the pulley 41 can also be set as a plastic material.

[0057] In one embodiment, the shock absorbing member 4 includes a slider 42 detachably disposed on the peripheral portion 92, and the structure is as follows: Figure 4 and Figure 5 As shown, the slider 42 contacts and acts on the telescopic inner arm 2 to control the position of the telescopic cylinder and reduce the vibration and deformation of the telescopic cylinder.

[0058] In one embodiment, at least one adjustment pad 43 is sandwiched between the peripheral portion 92 and the slider 42, and the structure is as follows: Figure 5 shown.

[0059] It should be noted that, by providing at least one adjustment pad 43 between the peripheral portion 92 and the slider 42, the gap between the slider 42 and the telescopic inner arm 2 can be effectively adjusted, so that the gaps between the peripheral portions 92 of the mounting frame 9 and the inner wall surfaces of the telescopic inner arm 2 are appropriate, thereby ensuring that after the piston rod 5 of the telescopic cylinder is extended, the shaking of the connection position between the cylinder barrel 3 and the piston rod 5 is effectively limited, thereby reducing the deformation of the telescopic cylinder.

[0060] In one embodiment, the slider 42 includes a nylon material, so that the slider 42 can slide smoothly relative to the telescopic inner arm 2, and the wear resistance and service life of the slider 42 can be ensured, and the slider 42 made of nylon will not cause damage to the telescopic inner arm 2. Of course, the slider 42 can also be set as a plastic material.

[0061] In one embodiment, the bottom sides of the slider 42 and the top sides of the peripheral portion 92 are provided with stop blocks 44, the structure of which is as follows: Figure 6 As shown, it only shows the position of the limit block 44 on the mounting frame 9, and does not include the slider 42, so that the installation position of the limit block 44 can be clearly seen.

[0062] It should be noted that the slider 42 can be fixed to the mounting frame 9 by bolts 45. In order to prevent a large shear force from being generated on the bolts 45 during the telescopic process, limit blocks 44 can be welded on both sides of the bottom of the slider 42, and the limit blocks 44 are connected to the top of the peripheral portion 92, which can effectively reduce the shear force borne by the bolts 45, thereby increasing the structural stability of the telescopic cylinder.

[0063] In addition, it should be noted that the orientation or positional relationship indicated by "inside and outside" etc. in the present invention is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of simplifying the description and facilitating understanding, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0064] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referenced to each other. Any combination of all embodiments provided by the utility model is within the protection scope of this utility model and will not be described in detail here.

[0065] The telescopic device provided by the utility model is introduced in detail above. The principle and implementation method of the utility model are explained in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A telescopic device, characterized in that: include: Telescopic outer arm (1); A telescopic inner arm (2) movably disposed within the telescopic outer arm (1); A telescopic oil cylinder, comprising a cylinder barrel (3) and a piston rod (5) arranged along the central axis of the telescopic inner arm (2); the piston rod (5) is arranged in the cylinder barrel (3) and is telescopically movable relative to the cylinder barrel (3); A mounting frame (9) is arranged on the cylinder (3), and four peripheral portions (92) of the mounting frame (9) are respectively distributed parallel to four inner wall surfaces of the telescopic inner arm (2); A shock absorbing member (4) is respectively arranged on the four peripheral parts (92). In an initial state, the shock absorbing member (4) and the telescopic inner arm (2) are in contact or have a gap therebetween. The shock absorbing member (4) is used to contact the telescopic inner arm (2) when the telescopic oil cylinder shakes, so as to limit the position of the telescopic oil cylinder.

2. The telescopic device according to claim 1, characterized in that: The mounting frame (9) is provided at the end of the cylinder barrel (3) close to the piston rod (5).

3. The telescopic device according to claim 1, characterized in that: The mounting frame (9) comprises a bottom plate (91) arranged on the cylinder barrel (3) and four peripheral portions (92), wherein the bottom plate (91) is provided with a through hole for passing through the cylinder barrel (3), and the four peripheral portions (92) are respectively arranged around the bottom plate (91).

4. The telescopic device according to claim 3, characterized in that: The four peripheral parts (92) and the bottom plate (91) are an integrated structural component.

5. The telescopic device according to any one of claims 1 to 4, characterized in that: The shock absorbing member (4) comprises a bearing seat (7) and a pulley (41), two bearing seats (7) are symmetrically arranged on each peripheral portion (92), and the two ends of the pulley (41) are respectively connected to the bearing seat (7) through a pin shaft (6).

6. The telescopic device according to claim 5, characterized in that: The pulley (41) comprises a nylon material.

7. The telescopic device according to any one of claims 1 to 4, characterized in that: The shock absorbing member (4) comprises a sliding block (42) which is detachably arranged on the peripheral portion (92).

8. The telescopic device according to claim 7, characterized in that: At least one adjustment pad (43) is sandwiched between the peripheral portion (92) and the slider (42).

9. The telescopic device according to claim 7, characterized in that: The slider (42) comprises a nylon material.

10. The telescopic device according to claim 7, characterized in that: Limiting blocks (44) are correspondingly provided on both sides of the bottom of the sliding block (42) and on both sides of the top of the peripheral portion (92).

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