Telescopic device and engineering machinery

Abstract

The utility model belongs to the technical field of telescopic equipment, and particularly discloses a telescopic device and engineering machinery. The telescopic device comprises a driving mechanism, a lead screw, a nut, an inner sleeve and an outer sleeve. The driving mechanism is in power connection with the screw rod so as to drive the screw rod to rotate forwards or reversely; the screw rod is sleeved with the nut, the inner sleeve is connected with the nut, the outer sleeve is arranged on the outer side of the inner sleeve in an embedded mode, the inner sleeve is in sliding fit with the outer sleeve, the nut reciprocates along the screw rod through rotation of the screw rod, and then the inner sleeve is driven to slide relative to the outer sleeve; the inner sleeve and the outer sleeve are connected with a target piece, and the inner sleeve slides relative to the outer sleeve so that the telescopic device can stretch or retract. The telescopic device is compact in structure, low in manufacturing cost and high in space utilization rate, the problem that a telescopic mechanism is stuck due to mechanical errors can be avoided, accurate position control is completed, high-precision and high-stability telescopic movement in a limited space is achieved, and the telescopic device is easy to operate, convenient to maintain and high in applicability.

Description

Technical Field

[0001] The utility model belongs to the technical field of telescopic devices, and particularly relates to a telescopic device and construction machinery. Background Art

[0002] In the installation, maintenance and other construction operations of equipment, devices that can be telescopic in length or lift in height are often required. These devices with telescopic functions are called telescopic devices.

[0003] At present, telescopic devices have a wide range of application fields and can meet the needs of different application scenarios. However, the telescopic devices in the prior art still have the following problems: First, the design cost and manufacturing cost of traditional telescopic devices are relatively high. The reason is that traditional telescopic devices contain more components, their mechanical structures are complex, the assembly process is cumbersome, and in order to ensure the normal operation and precise control of the telescopic device, high-precision processing equipment and processes are often required. After assembly, the telescopic device also needs to be finely adjusted and calibrated, thus resulting in an increase in cost. Second, traditional telescopic devices also have the problem of limited driving force. For some telescopic devices using transmission structures such as gears, due to the limited transmission ratio and transmission efficiency of their transmission mechanisms, they may not be able to meet the requirements of large driving force or high-speed rotation; for electrically driven telescopic devices, in order to achieve sufficient driving force and telescopic speed, a motor with a larger power is required. When a large-power motor operates, the energy consumption is relatively high, which not only increases the operating cost but also raises the requirements for the power supply. To meet the needs of the large-power motor, special power supply equipment and lines may also need to be configured, increasing the complexity of installation and use.

[0004] Therefore, it can be seen that the structure of the telescopic device in the prior art needs to be further improved. Content of the Utility Model

[0005] The purpose of the utility model is to provide a telescopic device and construction machinery, which simplify the structure of the traditional telescopic device to reduce costs. The inner sleeve and the outer sleeve are in sliding fit, and the inner sleeve extends and retracts relative to the outer sleeve through screw drive, thereby changing the length of the telescopic device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A telescopic device includes a driving mechanism, a lead screw, a nut, an inner sleeve and an outer sleeve;

[0008] The driving mechanism is power-connected to the lead screw, and the nut is sleeved on the lead screw;

[0009] The inner sleeve is connected to the nut, the outer sleeve is nested outside the inner sleeve, and the inner sleeve and the outer sleeve are in sliding fit;

[0010] The driving mechanism drives the lead screw to rotate forward or backward. Through the rotation of the lead screw, the nut moves reciprocally along the lead screw, thereby driving the inner sleeve to slide relative to the outer sleeve, so that the telescopic device extends or shortens.

[0011] Preferably, the driving mechanism is arranged on the mounting seat, and the mounting seat is hinged to one end of the outer sleeve.

[0012] Preferably, the nut is hinged to the inner sleeve.

[0013] Preferably, wear-resistant blocks are arranged between the outer sleeve and the inner sleeve.

[0014] Preferably, the wear-resistant blocks are made of nylon material.

[0015] Preferably, the output rotating shaft of the driving mechanism is connected to the lead screw through a coupling.

[0016] Preferably, the driving mechanism adopts a hydraulic motor or an electric motor.

[0017] Preferably, a bearing is sleeved on one side of the lead screw close to the coupling.

[0018] Preferably, the bearing adopts a deep groove ball bearing and / or a thrust cylindrical roller bearing.

[0019] A construction machinery is provided with the above-mentioned telescopic device.

[0020] Compared with the prior art, the present utility model has the following beneficial effects:

[0021] As described above, the present utility model relates to a telescopic device and a construction machinery. The telescopic device simplifies the traditional product structure, has a compact structure, reduces the number of parts, is convenient for processing and production, and reduces the manufacturing cost; the inner sleeve and the outer sleeve of the telescopic device of the present utility model are in sliding fit, a hydraulic motor is used to provide stronger driving force and improve space utilization rate. By hinging the mounting seat to the outer sleeve and the nut to the inner sleeve, the requirement for assembly precision is low, the assembly efficiency is high, and the problem of the telescopic mechanism being stuck due to mechanical errors is avoided. Utilizing the advantages of low friction and high transmission efficiency between the lead screw and the nut, more precise position control is carried out through thread adjustment, and telescopic movement with high precision and high stability in a limited space is realized; in addition, the telescopic device is simple to operate, convenient to maintain, and has strong applicability. By driving the lead screw to rotate forward or backward through the driving mechanism, the inner sleeve extends or retracts relative to the outer sleeve, and thus the telescopic device can be extended or shortened, which can meet the requirements of various application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0023] Figure 1 Partial structural schematic of the telescopic device according to an embodiment of the present utility model Figure 1 ;

[0024] Figure 2 Partial structural schematic of the telescopic device according to an embodiment of the present utility model Figure 2 ;

[0025] Figure 3 is Figure 2 Schematic structural diagram obtained by omitting part of the outer sleeve of the telescopic device in ;

[0026] Figure 4 Partial structural schematic of the telescopic device according to an embodiment of the present utility model Figure 3 ;

[0027] Figure 5 is Figure 4 Schematic structural diagram obtained by omitting part of the outer sleeve of the telescopic device in ;

[0028] Figure 6 Partial structural schematic of the telescopic device according to an embodiment of the present utility model Figure 4 ;

[0029] Figure 7 is Figure 6 Schematic structural diagram obtained by omitting part of the outer sleeve of the telescopic device in ;

[0030] Figure 8 Cross-sectional view of the partial structure of the telescopic device according to an embodiment of the present utility model

[0031] Wherein, 1 - drive mechanism, 11 - output rotating shaft, 2 - lead screw, 3 - lead screw nut, 4 - inner sleeve, 5 - outer sleeve, 6 - wear-resistant block, 7 - coupling, 81 - deep groove ball bearing, 82 - thrust cylindrical roller bearing. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0033] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present utility model, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In addition, the technical solutions between various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0038] Embodiment 1

[0039] As Figures 1 to 8 shown, in this embodiment, the telescopic device includes a driving mechanism 1, a lead screw 2, a lead nut 3, an inner sleeve 4, and an outer sleeve 5.

[0040] Define the clockwise rotation of the lead screw 2 as the forward rotation, then the counterclockwise rotation of the lead screw 2 is the reverse rotation.

[0041] The driving mechanism 1 is power-connected to the lead screw 2, and the driving mechanism 1 drives the lead screw 2 to rotate forward or reverse. The driving mechanism 1 can be a hydraulic motor or an electric motor. In this embodiment, the driving mechanism 1 is preferably a hydraulic motor. The hydraulic motor can provide stronger driving force for the telescopic mechanism, while avoiding the requirements of a high-power electric motor for the power supply, effectively improving the space utilization rate of the telescopic device and facilitating installation and use.

[0042] As Figure 8As shown, in this embodiment, the output rotating shaft 11 of the driving mechanism 1 and the lead screw 2 are respectively key-connected to the coupling 7. The output rotating shaft 11 and the lead screw 2 are connected by the coupling 7, and the lead screw 2 is driven to rotate by the output rotating shaft 11.

[0043] The nut 3 is sleeved on the lead screw 2. The inner sleeve 4 is connected to the nut 3. The outer sleeve 5 is nested outside the inner sleeve 4. The inner sleeve 4 and the outer sleeve 5 are in sliding fit. By the rotation of the lead screw 2, the nut 3 moves back and forth along the lead screw, thereby driving the inner sleeve 4 to slide relative to the outer sleeve 5. The inner sleeve 4 and the outer sleeve 5 are respectively connected to the target member. In this embodiment, the connection manner between the target member and the inner sleeve and the outer sleeve is preferably hinged. The inner sleeve 4 and the outer sleeve 5 are in sliding fit to make the telescopic device extend or shorten, thereby driving the target member to close or unfold.

[0044] In this embodiment, a bearing is also sleeved on one side of the lead screw 2 close to the coupling 7 for load-bearing support. The bearing preferably adopts a deep groove ball bearing 81 and a thrust cylindrical roller bearing 82.

[0045] The telescopic device of this embodiment is also provided with a mounting seat. The driving mechanism 1 is arranged on the mounting seat. The mounting seat is hinged to one end of the outer sleeve 5. There is a gap between the lead screw 2 and the nut 3, so that the inner sleeve 4 can swing at a small angle relative to the outer sleeve 5 to avoid the telescopic mechanism being stuck due to mechanical errors existing in the driving mechanism 1.

[0046] In addition, a wear-resistant block 6 is arranged between the outer sleeve 5 and the inner sleeve 4. The wear-resistant block 6 is preferably made of nylon material. In this embodiment, the material of the wear-resistant block 6 is MC nylon. The wear-resistant block 6 is preferably arranged on the outer side surface of the inner sleeve 4. The wear-resistant block 6 is a detachable and replaceable consumable part. The existence of the wear-resistant block 6 avoids the wear caused by the direct contact between the outer sleeve 5 and the inner sleeve 4, which is beneficial to extending the service life of the telescopic device.

[0047] In addition, in this embodiment, the materials preferably adopted for the coupling 7 and the lead screw 2 are 40Cr. After quenching and tempering treatment, its hardness reaches HB240 - 280, and after blackening treatment to isolate air, the purpose of rust prevention is achieved.

[0048] When the telescopic device of this embodiment is in use, first start the driving mechanism 1. The output rotating shaft 11 of the driving mechanism 1 drives the lead screw 2 to rotate, so that the nut 3 moves along the lead screw 2, and the inner sleeve 4 slides along the outer sleeve 5. When the inner sleeve 4 retracts relative to the outer sleeve 5, the length of the telescopic device shortens, and the target member unfolds driven by the telescopic device. When the inner sleeve 4 extends relative to the outer sleeve 5, the length of the telescopic device elongates, and the target member closes driven by the telescopic device.

[0049] Embodiment 2

[0050] Embodiment 2 describes a telescopic device with another structure. Except for the following technical features that are different from those in Embodiment 1 above, the rest of the technical features can refer to Embodiment 1 above.

[0051] In this embodiment, the nut 3 of the telescopic device is hinged to the inner sleeve 4, so that the inner sleeve 4 can swing at a relatively large angle relative to the outer sleeve 5, which can more effectively avoid the problem that the telescopic mechanism is stuck due to the mechanical error of the driving mechanism 1 compared with Embodiment 1.

[0052] Embodiment 3

[0053] A construction machine is provided with the telescopic device for the crossing platform as described in Embodiment 1 or Embodiment 2.

[0054] So far, this embodiment has been described in detail with reference to the drawings. Based on the above description, those skilled in the art should have a clear understanding of the telescopic device of the present invention. The telescopic device described in the present invention simplifies the traditional product structure, has a compact structure, reduces the number of parts, is convenient for processing and production, and reduces the manufacturing cost; in the telescopic device of the present invention, the inner sleeve 4 and the outer sleeve 5 are in sliding fit, and a hydraulic motor is used to provide stronger driving force and improve the space utilization rate. By hinging the mounting seat to the outer sleeve 5 and the nut 3 to the inner sleeve 4, the requirement for assembly accuracy is low, the assembly efficiency is high, and the problem that the telescopic mechanism is stuck due to mechanical error is avoided. Utilizing the advantages of low friction and high transmission efficiency between the lead screw 2 and the nut 3, more precise position control is achieved through screw adjustment, realizing high-precision and high-stability telescopic movement in a limited space; in addition, the operation of this telescopic device is simple, the maintenance is convenient, and the applicability is strong. By driving the lead screw 2 to rotate forward or backward by the driving mechanism 1, the inner sleeve 4 extends or retracts relative to the outer sleeve 5, and the telescopic device can be extended or shortened, which can meet the requirements of various application scenarios.

[0055] Of course, the above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention and should be protected by the present invention.

Claims

1. A telescopic device, characterized in that, It includes a driving mechanism, a lead screw, a nut, an inner sleeve and an outer sleeve; The driving mechanism is power-connected to the lead screw, and the nut is sleeved on the lead screw; The inner sleeve is connected to the nut, the outer sleeve is nested outside the inner sleeve, and the inner sleeve and the outer sleeve are in sliding fit; The driving mechanism drives the lead screw to rotate forward or backward. Through the rotation of the lead screw, the nut reciprocates along the lead screw, thereby driving the inner sleeve to slide relative to the outer sleeve, so that the telescopic device extends or contracts.

2. The telescopic device according to claim 1, wherein The driving mechanism is arranged on the mounting seat, and the mounting seat is hinged to one end of the outer sleeve.

3. The telescopic device according to claim 2, wherein The nut is hinged to the inner sleeve.

4. The telescopic device according to claim 1, wherein Wear-resistant blocks are arranged between the outer sleeve and the inner sleeve.

5. The telescopic device according to claim 4, wherein The wear-resistant blocks are made of nylon material.

6. The telescopic device according to claim 1, wherein The output rotating shaft of the driving mechanism is connected to the lead screw through a coupling.

7. The telescopic device according to any one of claims 1, 2, and 6, wherein The driving mechanism adopts a hydraulic motor or an electric motor.

8. The telescopic device according to claim 6, wherein A bearing is sleeved on one side of the lead screw close to the coupling.

9. The telescopic device according to claim 8, wherein The bearing adopts a deep groove ball bearing and / or a thrust cylindrical roller bearing.

10. A construction machinery, wherein The construction machinery is provided with the telescopic device according to any one of claims 1 to 9.

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