Telescopic arm slider device

Abstract

The utility model discloses a telescopic arm slider device, including a first guard plate, a rotating shaft and a roller. The first guard plate is arranged at the arm head of the outer arm. There are multiple first guard plates, and the multiple first guard plates are evenly distributed on the peripheral side of the arm head. At least one rotating shaft is arranged on the side of the first guard plate away from the outer arm, so the axial direction of the rotating shaft is skewed and perpendicular to the length direction of the outer arm. Each rotating shaft is rotatably mounted with a roller. A first window is arranged in the middle of the first guard plate, and a second window is arranged at a position corresponding to the first window of the arm head. Part of the cylindrical surface of the roller contacts the inner arm after passing through the first window and the second window. On the one hand, sliding friction is converted into rolling friction, reducing the friction force when the telescopic arm is extended and retracted, thereby increasing the service life of the telescopic arm; on the other hand, the guard plate is arranged on the outside of the outer arm, which is convenient for installation and disassembly and maintenance; thirdly, the overall structure is simple, which can effectively reduce costs.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic arms, in particular to a telescopic arm slider device. Background Art

[0002] In engineering equipment, such as cranes, aerial work vehicles, fire pump trucks, mobile lighting vehicles, etc., they are equipped with a retractable boom (telescopic arm), so that they can reach the corresponding height during operation. This telescopic arm is generally composed of a multi-section arm, and a slider device is provided in the gap between the inner and outer arms. Generally, the inner arm slider is arranged at the end of the arm, and the outer arm slider is arranged at the head of the arm. During operation, the inner arm will extend and generate corresponding forces through the interaction of the sliders. The contact between the sliders is surface contact, and the friction between the sliders is sliding friction, which has large resistance and complex structure. A few booms are provided with a rolling device in the gap between the inner and outer arms. Although it can reduce resistance, there are problems such as complex structure, inconvenient installation, and high cost. Therefore, it is urgent to study a new rolling device installed in the gap between the inner and outer arms, which can not only convert sliding into rolling to reduce friction resistance, but also simplify the structure, facilitate installation, and reduce costs. Utility Model Content

[0003] To this end, the utility model provides a telescopic arm slider device to solve or alleviate one or more of the above-mentioned problems.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A telescopic arm slider device includes a first guard plate, a rotating shaft and a roller. The first guard plate is arranged at the arm head of an outer arm. There are multiple first guard plates, and the multiple first guard plates are evenly distributed on the circumference of the arm head. At least one rotating shaft is arranged on the side of the first guard plate away from the outer arm, so the axial direction of the rotating shaft is skewed and perpendicular to the length direction of the outer arm. Each rotating shaft is rotatably mounted with a roller. A first window is arranged in the middle of the first guard plate, and a second window is arranged at a position of the arm head corresponding to the first window. Part of the cylindrical surface of the roller contacts the inner arm after passing through the first window and the second window.

[0006] Furthermore, the rotating shaft, the first guard plate and the outer arm are connected via a connecting piece.

[0007] Furthermore, a mounting plane is provided on the end of the rotating shaft facing the side of the first guard plate, a first through hole is provided on the end of the rotating shaft, a second through hole is provided at a position of the first guard plate corresponding to the first through hole, a threaded hole is provided at a position of the arm head corresponding to the second through hole, and the connecting member is a bolt, and the threaded end of the bolt passes through the first through hole and the second through hole and is screwed into the threaded hole.

[0008] Furthermore, a tightening plane is provided on a side of the end of the rotating shaft facing away from the first guard plate.

[0009] Furthermore, the rotating shaft, the first guard plate and the outer arm are connected by at least two bolts, and the plurality of bolts are symmetrically distributed relative to the first window.

[0010] Furthermore, the telescopic arm slider device also includes a second guard plate, one end of the second guard plate is connected to the first guard plate, the other end of the second guard plate extends along the length direction of the outer arm and exceeds the arm head, and the other end of the second guard plate is inclined toward the direction close to the inner arm.

[0011] Furthermore, the second guard plate and the first guard plate are formed as an integral structure.

[0012] Furthermore, there are four of each of the first guard plates, rotating shafts and rollers, and the four first guard plates, rotating shafts and rollers are arranged in one-to-one correspondence.

[0013] Furthermore, the first window and the second window are both rectangular holes.

[0014] The utility model has the following advantages:

[0015] On the one hand, sliding friction is converted into rolling friction, reducing the friction when the telescopic arm is extended and retracted, thereby increasing the service life of the telescopic arm; on the other hand, the guard plate is installed on the outside of the outer arm, which is easy to install and disassemble and maintain; thirdly, the overall structure is simple, which can effectively reduce costs.

[0016] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0019] Figure 1 A schematic diagram of a cross section of a telescopic arm slider device provided by an embodiment of the utility model;

[0020] Figure 2 A schematic structural diagram of a telescopic arm slider device provided in an embodiment of the utility model;

[0021] Figure 3 A schematic diagram of a longitudinal section of a telescopic arm slider device provided in an embodiment of the utility model;

[0022] Figure 4 for Figure 3 Exploded schematic diagram of the structure shown.

[0023] In the figure: 1-outer arm, 11-threaded hole, 12-second window, 2-inner arm, 3-rotating shaft, 31-tightening plane, 32-first through hole, 33-installing plane, 4-roller, 5-first guard plate, 51-second through hole, 52-first window, 6-connector, 7-second guard plate. DETAILED DESCRIPTION

[0024] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0025] like Figure 1-4As shown, this embodiment provides a telescopic arm slider device, including a first guard plate 5, a rotating shaft 3 and a roller 4. The first guard plate 5 is arranged at the arm head of the outer arm 1. There are multiple first guard plates 5, and the multiple first guard plates 5 are evenly distributed on the circumference of the arm head. At least one rotating shaft 3 is arranged on the side of the first guard plate 5 away from the outer arm 1, so the axial direction of the rotating shaft 3 is eccentrically perpendicular to the length direction of the outer arm 1, and each rotating shaft 3 is rotatably mounted with a roller 4; in this embodiment, a rotating shaft 3 is fixed on each first guard plate 5, and each rotating shaft 3 is mounted with a roller 4. A first window 52 is arranged in the middle of the first guard plate 5, and a second window 12 is arranged at the position corresponding to the first window 52 of the arm head. Part of the cylindrical surface of the roller 4 passes through the first window 52 and the second window 12 and contacts the inner arm 2; the first window 52 and the second window 12 are both rectangular holes. The telescopic arm slider device of this embodiment is applied to a box-type telescopic arm, so four first guard plates 5 are provided, and one first guard plate 5 is respectively installed on the four surfaces of the outer arm 1 (with a rectangular cross section). For example, the roller 4 is provided with a through hole, and the roller 4 can be rotatably sleeved on the rotating shaft 3; since the roller 4 is almost not subjected to force in the axial direction, the position of the roller 4 in the axial direction of the rotating shaft 3 can be limited by a pin, a shaft end retaining spring, etc. For example, a bearing is provided between the roller 4 and the rotating shaft 3, which can further reduce the friction.

[0026] On the one hand, sliding friction is converted into rolling friction, which reduces the friction when the telescopic arm is extended and retracted, thereby increasing the service life of the telescopic arm; on the other hand, the guard plate is installed on the outside of the outer arm 1, which is easy to install and disassemble and maintain; thirdly, the overall structure is simple, which can effectively reduce costs.

[0027] In this embodiment, the rotating shaft 3, the first guard plate 5 and the outer arm 1 are connected by a connecting member 6. Exemplarily, the connecting member 6 passes through the rotating shaft 3, the first guard plate 5 and the wall plate of the outer arm 1 in sequence to fasten the rotating shaft 3, the first guard plate 5 and the outer arm 1 together. Specifically, a mounting plane 33 is provided on the side of the end of the rotating shaft 3 facing the first guard plate 5 so that the rotating shaft 3 can better fit with the first guard plate 5; a first through hole 32 is provided on the end of the rotating shaft 3, and a second through hole 51 is provided at a position corresponding to the first through hole 32 of the first guard plate 5 to penetrate the connecting member 6; a threaded hole 11 is provided at a position corresponding to the second through hole 51 of the arm head, and the connecting member 6 is a bolt, and the threaded end of the bolt passes through the first through hole 32 and the second through hole 51 and then screws into the threaded hole 11, thereby fastening the rotating shaft 3, the first guard plate 5 and the outer arm 1 together. Preferably, a tightening plane 31 is provided on the end of the rotating shaft 3 away from the first guard plate 5, so as to increase the contact area between the cap of the bolt and the shaft end, thereby increasing the friction force and achieving the purpose of preventing loosening. Generally, the rotating shaft 3, the first guard plate 5 and the outer arm 1 are connected by two bolts, and the two bolts are symmetrically distributed relative to the first window 52; more bolts can also be used for connection.

[0028] In this embodiment, the telescopic arm slider device further includes a second guard plate 7, one end of which is connected to the first guard plate 5, the other end of which extends along the length direction of the outer arm 1 and exceeds the arm head, and the other end of the second guard plate 7 is inclined toward the direction close to the inner arm 2. Preferably, the second guard plate 7 and the first guard plate 5 are integrally formed.

[0029] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0034] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A telescopic arm slider device, characterized in that: It includes a first guard plate, a rotating shaft and a roller. The first guard plate is arranged at the arm head of the outer arm. There are multiple first guard plates, and the multiple first guard plates are evenly distributed on the circumference of the arm head. At least one rotating shaft is arranged on the side of the first guard plate away from the outer arm, so the axial direction of the rotating shaft is skewed and perpendicular to the length direction of the outer arm. Each rotating shaft is rotatably mounted with a roller. A first window is arranged in the middle of the first guard plate, and a second window is arranged at a position of the arm head corresponding to the first window. Part of the cylindrical surface of the roller contacts the inner arm after passing through the first window and the second window.

2. The telescopic arm slider device according to claim 1, characterized in that: The rotating shaft, the first guard plate and the outer arm are connected via a connecting piece.

3. The telescopic arm slider device according to claim 2, characterized in that: A mounting plane is provided at the end of the rotating shaft facing the side of the first guard plate, a first through hole is provided at the end of the rotating shaft, a second through hole is provided at a position of the first guard plate corresponding to the first through hole, a threaded hole is provided at a position of the arm head corresponding to the second through hole, and the connecting piece is a bolt, and the threaded end of the bolt passes through the first through hole and the second through hole and then screwed into the threaded hole.

4. The telescopic arm slider device according to claim 3, characterized in that: A tightening plane is provided on a side of the end of the rotating shaft facing away from the first guard plate.

5. The telescopic arm slider device according to claim 3, characterized in that: The rotating shaft, the first guard plate and the outer arm are connected by at least two of the bolts, and a plurality of the bolts are symmetrically distributed relative to the first window.

6. The telescopic arm slider device according to claim 1, characterized in that: The telescopic arm slider device also includes a second guard plate, one end of which is connected to the first guard plate, the other end of which extends along the length direction of the outer arm and exceeds the arm head, and the other end of the second guard plate is inclined toward the direction close to the inner arm.

7. The telescopic arm slider device according to claim 6, characterized in that: The second guard plate and the first guard plate are formed as an integral structure.

8. The telescopic arm slider device according to claim 1, characterized in that: There are four of each of the first guard plates, rotating shafts and rollers, and the four first guard plates, rotating shafts and rollers are arranged in one-to-one correspondence.

9. The telescopic arm slider device according to claim 1, characterized in that: The first opening window and the second opening window are both rectangular holes.

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