A crane boom brake device

Abstract

The utility model discloses a hoist arm brake device relates to engineering machinery brake technical field, including gear, friction wheel, double arc brake shoe, lining, connecting plate, connecting rod and threaded sleeve, and the coaxial solid installation of friction wheel is at gear one side, and the lateral wall opens annular groove, and the symmetrical setting of double arc brake shoe is in annular groove, and both sides solid installation lining, and brake shoe one end is hinged with two groups of two connecting plate through first pin shaft, and two groups of connecting plate are hinged through second pin shaft, and brake shoe other end is hinged with connecting rod through third pin shaft, and two groups of connecting rod are with threaded sleeve screw connection. The rotation threaded sleeve can adjust brake shoe spacing, realize the clamping or separation of lining and annular groove groove wall. The device is stable, and the adjustment is accurate, and the maintenance is convenient, can adapt to low temperature and other complex working conditions, solves the problem that the existing brake device is easy to lose, and the service life is short.

Description

Technical Field

[0001] This utility model relates to the field of braking technology for engineering machinery, and in particular to a crane boom braking device. Background Technology

[0002] In the field of construction machinery, the crane boom, as a core component for lifting and handling operations, directly affects operational safety and efficiency with its braking performance. Currently, some crane booms employ airbag braking structures, relying on the inflation and deflation of airbags for braking control. However, this type of braking structure is prone to problems such as difficulty in defrosting the airbags and failure to deploy properly in low-temperature environments, leading to brake failure. Furthermore, airbags are prone to leakage after prolonged use, requiring frequent replacements and affecting the normal operation of the crane boom, thus reducing equipment efficiency.

[0003] Furthermore, some existing brake shoe-type braking devices suffer from unreasonable structural design issues, such as insufficient contact between the brake shoe and friction components, and low precision of the adjustment mechanism. This results in poor braking stability and insufficient braking force, making it difficult to meet the high-intensity, high-frequency operation requirements of the crane boom. Therefore, a crane boom braking device with stable structure, reliable braking, and adaptability to complex working conditions is needed to overcome the shortcomings of existing technologies. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a crane boom braking device.

[0005] The present invention provides a crane boom braking device, comprising a gear, a friction wheel, a double arc brake shoe, a liner, a connecting plate, a connecting rod, and a threaded sleeve;

[0006] The friction wheel is coaxially fixed to one side end face of the gear, and an annular groove is formed on the side wall of the friction wheel; the double arc-shaped brake shoes are symmetrically arranged in the annular groove, and the lining strip is fixed on both side walls of the double arc-shaped brake shoes, and the lining strip is adapted to the groove wall of the annular groove.

[0007] One end of the double arc-shaped brake shoe forms a first connecting part, and the first connecting part is hinged to a connecting plate by a first pin, and the two sets of connecting plates are hinged to each other by a second pin.

[0008] The other end of the double-arc brake shoe forms a second connecting part, which is hinged to one end of the connecting rod via a third pin. The other ends of the two sets of connecting rods are threadedly connected to the threaded sleeve. Rotating the threaded sleeve can adjust the spacing between the second connecting parts of the double-arc brake shoe to achieve clamping or separation of the liner from the annular groove wall.

[0009] Preferably, the curvature of the double-arc brake shoe matches the curvature of the inner wall of the annular groove of the friction wheel, and the outer contour dimension of the double-arc brake shoe is adapted to the inner contour dimension of the annular groove, so as to ensure that the double-arc brake shoe can move stably in the annular groove.

[0010] Preferably, the liner is made of a wear-resistant friction material, and the liner is fixed to the two side walls of the double arc-shaped brake shoe by a detachable connection.

[0011] Preferably, the two sets of connecting plates have the same structural dimensions, and both sets of connecting plates are perpendicular to the first connecting part of the double arc-shaped brake shoe, so as to achieve stable rotation of the double arc-shaped brake shoe around the pin shaft.

[0012] Preferably, the inner wall of the threaded sleeve is provided with an internal thread, and the outer wall of the connecting rod is provided with an external thread. The pitch and tooth profile of the internal thread and the external thread are matched so that the length adjustment between the connecting rod and the threaded sleeve can be achieved through threaded engagement.

[0013] Preferably, the friction wheel and the gear are integrally formed, or the friction wheel is coaxially fixed to the gear through an intermediate shaft and a nut.

[0014] The crane boom braking device proposed in this utility model has the following beneficial effects:

[0015] The braking performance is stable. The design of the double arc-shaped brake shoe and the annular groove, as well as the vertical setting of the connecting plate, ensures stable movement of the brake shoe during braking. The lining and the groove wall are in full contact to avoid brake failure. It is also unaffected by low temperature environment and can work normally in the temperature range of -30℃ to 60℃.

[0016] The use of trapezoidal thread allows for length adjustment of the connecting rod and threaded sleeve, enabling precise control of the spacing between the double-arc brake shoes. The braking force adjustment error is less than 0.5kN, meeting the braking requirements under different operating conditions.

[0017] Maintenance is convenient. The liner adopts a detachable connection method, and the friction wheel can be removed through the intermediate shaft and nut. During later maintenance, there is no need to disassemble the entire braking device, which shortens maintenance time and reduces maintenance costs.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a partial cross-sectional view of the present invention.

[0021] The following are the labels in the diagram: 1. Gear; 2. Friction wheel; 3. Double arc brake shoe; 4. Liner; 5. Connecting plate; 6. First pin; 7. Second pin; 8. Third pin; 9. Connecting rod; 10. Threaded sleeve. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] like Figures 1-2 The diagram shows a crane boom braking device, which includes a gear 1, a friction wheel 2, a double-arc brake shoe 3, a liner 4, a connecting plate 5, a connecting rod 9, and a threaded sleeve 10. The friction wheel 2 is coaxially fixed to one end face of the gear 1, and an annular groove is formed on the side wall of the friction wheel 2. The double-arc brake shoes 3 are symmetrically arranged in the annular groove, and the liner 4 is fixed on both side walls of the double-arc brake shoes 3. The liner 4 is adapted to the groove wall of the annular groove.

[0024] One end of the double arc-shaped brake shoe 3 forms a first connecting part, and the first connecting part is hinged to the connecting plate 5 by a first pin 6, and the two sets of connecting plates 5 are hinged to each other by a second pin 7.

[0025] The double-arc brake shoe is mounted on a mounting bracket via the second pin 7, allowing the double-arc brake shoe 3 to move on a plane.

[0026] The other end of the double arc-shaped brake shoe 3 forms a second connecting part, which is hinged to one end of the connecting rod 9 via a third pin 8. The other ends of the two sets of connecting rods 9 are threadedly connected to the threaded sleeve 10. Rotating the threaded sleeve 10 can adjust the spacing between the second connecting parts of the double arc-shaped brake shoe 3 to achieve clamping or separation of the lining 4 from the annular groove wall.

[0027] The double-arc brake shoe 3 is designed to fit the annular groove: the curvature of the double-arc brake shoe 3 matches the curvature of the inner wall of the annular groove of the friction wheel 2, and the outer contour dimensions of the double-arc brake shoe 3 are adapted to the inner contour dimensions of the annular groove. This design ensures that the double-arc brake shoe 3 can move stably within the annular groove, avoids brake shoe displacement during braking, and ensures full contact between the liner 4 and the annular groove wall.

[0028] The double-arc brake shoe 3 is made of Q235 steel, and its arc is consistent with the arc of the inner wall of the annular groove. Its outer contour size is adapted to the inner contour size of the annular groove, ensuring that the brake shoe can move flexibly in the groove. The lining 4 is made of rubber-based friction material with a thickness of 5mm. It is fixed to the side walls of the brake shoe with M6 bolts with a bolt spacing of 50mm.

[0029] Material and connection method of the lining 4: The lining 4 is made of wear-resistant friction material, preferably rubber-based friction material or resin-based friction material. Such materials have the characteristics of high strength and high wear resistance, which can extend the service life of the lining 4. At the same time, the lining 4 is fixed to the two side walls of the double arc-shaped brake shoe 3 by a detachable connection method, such as bolt connection or snap connection. When the lining 4 is worn, it can be disassembled and replaced separately without replacing the entire brake shoe, thus reducing maintenance costs.

[0030] Optimized structure of connecting plate 5: The two sets of connecting plates 5 have the same structural dimensions, and both are perpendicular to the first connecting part of the double-arc brake shoe 3. This structural design ensures that the double-arc brake shoe 3 is subjected to uniform force when rotating around the pin shaft, avoids brake shoe jamming due to tilting of the connecting plate 5, and improves the stability of brake adjustment.

[0031] The inner wall of the threaded sleeve 10 is provided with an internal thread, and the outer wall of the connecting rod 9 is provided with an external thread. The pitch and tooth profile of the internal and external threads are matched, preferably trapezoidal threads. Trapezoidal threads have the characteristics of high transmission efficiency and strong load-bearing capacity. The length between the connecting rod 9 and the threaded sleeve 10 can be adjusted through precise thread matching, thereby synchronously and precisely controlling the spacing of the double arc brake shoes 3 to ensure the accuracy of braking force adjustment. Gear 1 and friction wheel 2: The friction wheel 2 is coaxially fixed to the gear 1 through the intermediate shaft 11 and the nut 12. The intermediate shaft 11 is made of 45 steel with a diameter of 30mm. One end is connected to the gear 1 through a flat key, and the other end passes through the friction wheel 2 and is locked with an M24 nut. The side wall of the friction wheel 2 has an annular groove with a width of 20mm and a depth of 15mm. The surface roughness of the groove wall is Ra1.6.

[0032] The friction wheel 2 and gear 1 can be integrally molded. The integrally molded structure has the advantages of high connection strength and good coaxiality, which can avoid relative sliding between the friction wheel 2 and gear 1. In addition, the friction wheel 2 can also be coaxially fixed with gear 1 through intermediate shaft 11 and nut 12. Specifically, one end of intermediate shaft 11 is fixed to gear 1, and the other end passes through friction wheel 2 and is locked by nut. This connection method facilitates the disassembly and replacement of friction wheel 2 and is suitable for working conditions where friction wheel 2 is prone to wear.

[0033] In this embodiment, during operation:

[0034] When the boom needs to be braked, the threaded sleeve 10 is rotated. Since the connecting rod 9 and the threaded sleeve 10 are engaged by a trapezoidal thread, the rotation of the threaded sleeve 10 causes the two sets of connecting rods 9 to retract into the sleeve. The distance between the second connecting parts of the double arc brake shoe 3 is reduced. The brake shoe rotates around the first pin 6 and the second pin 7 and moves closer to the wall of the annular groove until the lining 4 is in close contact with the groove wall. The friction between the lining 4 and the groove wall is used to brake the friction wheel 2. Since the friction wheel 2 is fixed coaxially with the gear 1, the gear 1 stops rotating with the friction wheel 2, thereby controlling the main body of the boom to stop moving.

[0035] When the crane boom needs to be released from the brake, the threaded sleeve 10 is rotated in the opposite direction, the connecting rod 9 extends out from the threaded sleeve 10, the distance between the second connecting parts of the double arc brake shoe 3 increases, the brake shoe drives the liner 4 away from the annular groove wall, the friction disappears, the friction wheel 2 rotates synchronously with the gear 1, and the crane boom resumes normal operation.

[0036] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A crane boom braking device, characterized in that, It includes a gear (1), a friction wheel (2), a double arc brake shoe (3), a liner (4), a connecting plate (5), a connecting rod (9), and a threaded sleeve (10). The friction wheel (2) is coaxially fixed to one side end face of the gear (1), and the side wall of the friction wheel (2) is provided with an annular groove; the double arc brake shoe (3) is symmetrically arranged in the annular groove, and the side walls of the double arc brake shoe (3) are both fixed with the lining strip (4), and the lining strip (4) is adapted to the groove wall of the annular groove. One end of the double arc-shaped brake shoe (3) forms a first connecting part, and the first connecting part is hinged to a connecting plate (5) by a first pin (6), and the two sets of connecting plates (5) are hinged to each other by a second pin (7). The other end of the double arc-shaped brake shoe (3) forms a second connecting part, which is hinged to one end of the connecting rod (9) through a third pin (8). The other ends of the two sets of connecting rods (9) are threadedly connected to the threaded sleeve (10). Rotating the threaded sleeve (10) can adjust the spacing between the second connecting parts of the double arc-shaped brake shoe (3) to achieve clamping or separation of the lining strip (4) from the annular groove wall.

2. The crane boom braking device according to claim 1, characterized in that, The curvature of the double-arc brake shoe (3) matches the curvature of the inner wall of the annular groove of the friction wheel (2), and the outer contour dimension of the double-arc brake shoe (3) is adapted to the inner contour dimension of the annular groove, so as to ensure that the double-arc brake shoe (3) can move stably in the annular groove.

3. The crane boom braking device according to claim 1, characterized in that, The lining strip (4) is made of wear-resistant friction material, and the lining strip (4) is fixed to the two side walls of the double arc-shaped brake shoe (3) by a detachable connection.

4. The crane boom braking device according to claim 1, characterized in that, The two sets of connecting plates (5) have the same structural dimensions, and both sets of connecting plates (5) are perpendicular to the first connecting part of the double arc-shaped brake shoe (3) so as to realize the stable rotation of the double arc-shaped brake shoe (3) around the pin shaft.

5. The crane boom braking device according to claim 1, characterized in that, The inner wall of the threaded sleeve (10) is provided with an internal thread, and the outer wall of the connecting rod (9) is provided with an external thread. The pitch and tooth profile of the internal thread and the external thread are matched so that the length between the connecting rod (9) and the threaded sleeve (10) can be adjusted through the threaded engagement.

6. The crane boom braking device according to claim 1, characterized in that, The friction wheel (2) and the gear (1) are integrally formed, or the friction wheel (2) is coaxially fixed with the gear (1) through the intermediate shaft (11) and the nut (12).

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