Telescopic boom structure of crane

Abstract

The utility model discloses a telescopic boom structure of a crane, which belongs to the technical field of crane accessories and is characterized in that a telescopic boom outer pipe is connected with a telescopic boom inner rod in a sliding manner, the surface of the telescopic boom inner rod is in contact connection with a rotatable eccentric roller, the surface of the eccentric roller is provided with a bracket, and two ends of the eccentric roller are fixedly sleeved with axially symmetrical sealing bearings; according to the telescopic arm structure of the crane, through the sealing bearing, the reinforcing sleeve and the cross rod which are arranged on the eccentric roller, stable rotation of the eccentric roller is facilitated, meanwhile, abrasion to the cross rod caused by rotation of the eccentric roller is greatly reduced, the service life of the cross rod is prolonged, and the service life of the cross rod is prolonged. The service life of the eccentric roller and the cross rod is prolonged, the angle adjusting range of the eccentric roller can be increased through the arranged reinforcing disc, the rotating shaft and the rotating disc, the connecting area of the eccentric roller and a telescopic arm of the crane can be increased, firmness can be improved, and then use safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of crane accessories, and more specifically to a crane telescopic arm structure. Background Art

[0002] Most of the telescopic arms of cranes adopt a multi-stage arm section nested inside and outside setting. The common crane telescopic arm structure will be equipped with an eccentric roller lower inner arm section for support. However, the eccentric roller of the crane telescopic arm structure will produce greater wear during long-term rotation, which greatly shortens the service life. In addition, the inclination angle adjustment range of the eccentric roller is inefficient and the connection strength is insufficient, which reduces its safety in use.

[0003] For example, a crane telescopic arm structure disclosed in publication number CN219156365U includes an outer segment tube and an inner segment tube located inside the outer segment tube, and a wheel frame is provided on the top of the negative surface of the outer segment tube.

[0004] It can be seen from the above-mentioned public scheme that the eccentric roller is rotatably connected to the support shaft. During the long-term rotation of the eccentric roller, the wear between the inner wall of the eccentric hole and the surface of the support shaft is large, which greatly shortens the service life of the eccentric roller and the support shaft. In addition, the eccentric roller is supported by a wheel frame, and the wheel frame is rotatably connected to the outer section tube through a positioning shaft. The connection area is small, the connection firmness is insufficient, and the wheel frame has a small adjustment range of the inclination angle of the eccentric roller, which reduces its convenience and safety in use. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of the utility model is to provide a crane telescopic arm structure, which, through the sealed bearing, reinforced sleeve and cross bar arranged on the eccentric roller, not only facilitates the stable rotation of the eccentric roller, but also greatly reduces the wear of the cross bar caused by the rotation of the eccentric roller, thereby extending the service life of the eccentric roller and the cross bar, and through the arranged reinforcement plate, rotating shaft and rotating plate, not only the angle adjustment range of the eccentric roller can be increased, but also the connection area and firmness with the crane telescopic arm can be increased, thereby improving the safety of use.

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] A telescopic arm structure of a crane, comprising a telescopic arm outer tube and a telescopic arm inner rod, the telescopic arm outer tube and the telescopic arm inner rod are slidably connected, the surface of the telescopic arm inner rod is contacted and connected with a rotatable eccentric roller, the surface of the eccentric roller is provided with a bracket, both ends of the eccentric roller are fixedly sleeved with axially symmetrical sealed bearings, the inner ring of the sealed bearing is fixedly sleeved with a reinforcing sleeve, the inner wall of the reinforcing sleeve is contacted and connected with a cross bar, both ends of the cross bar are provided with threaded rods, and the threaded rods are detachably connected with symmetrical support arms through second nuts, one end of the support arm is fixedly connected with a turntable, the surface of the turntable is plugged with a positioning rod, the center of the turntable A rotating shaft is rotatably connected to the center position, one end of the rotating shaft is provided with a connecting end, the surface of the connecting end is fixedly sleeved with a reinforcing plate, the surfaces of the connecting end and the reinforcing plate are fixedly connected to the surface of the outer tube of the telescopic arm. The telescopic arm structure of the crane, through the sealed bearing, reinforcing sleeve and cross bar arranged on the eccentric roller, not only facilitates the stable rotation of the eccentric roller, but also greatly reduces the wear of the cross bar caused by the rotation of the eccentric roller, and prolongs the service life of the eccentric roller and the cross bar, and through the arranged reinforcing plate, rotating shaft and rotating plate, not only the angle adjustment range of the eccentric roller can be increased, but also the connection area and firmness with the telescopic arm of the crane can be increased, thereby improving the safety of use.

[0008] Furthermore, one end of the reinforcing sleeve is provided with an axially penetrating sleeve hole, the inner wall of the sleeve hole is in contact and connected with the surface of the cross bar, the cross-sectional shapes of the sleeve hole and the cross bar are both polygonal, the end face of the cross bar is in contact and extruded with the surface of the support arm, and the polygonal cross bar and the sleeve hole allow the inner and outer rings of the sealed bearing to rotate stably, thereby allowing the eccentric roller to rotate stably, and at the same time, no rotational wear will occur between the cross bar.

[0009] Furthermore, both ends of the eccentric roller are provided with axially symmetrical eccentric bearing mounting grooves, and an axially penetrating mounting hole is provided at the center position of the eccentric bearing mounting groove. The inner wall of the mounting hole is in contact with and connected to the surface of the reinforcing sleeve, which is convenient for the installation and fixation of the symmetrical sealed bearings, and at the same time facilitates the assembly between the two sealed bearings and the reinforcing sleeve.

[0010] Furthermore, one end of the positioning rod is fixedly connected with an anti-slip cap, one end of the anti-slip cap is fixedly inlaid with an adsorption ring, the adsorption ring is made of a strong magnet, and the positioning rod is used to fix the rotation adjustment position of the turntable.

[0011] Furthermore, positioning holes are provided on the surface of the reinforcement plate, and the positioning holes are distributed in a circular shape with equal intervals. The inner wall of the positioning hole is in contact with and connected to one end of the positioning rod, and the positioning hole facilitates the insertion and fixation of the positioning rod.

[0012] Furthermore, the surface of the rotating shaft is connected with a first nut through a thread, and the surface of the rotating shaft is provided with a socket, and the inner wall of the socket is plugged with a pin, which is a detachable structure and can prevent the first nut from loosening.

[0013] Furthermore, the turntable is made of iron metal, and its surface is in contact with and adsorbed on the surface of an adsorption ring, so that the insertion position of the positioning rod can be automatically fixed by the adsorption ring.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] (1) This solution not only facilitates the stable rotation of the eccentric roller by providing a sealed bearing, a reinforced sleeve and a cross bar on the eccentric roller, but also greatly reduces the wear of the cross bar caused by the rotation of the eccentric roller, thereby extending the service life of the eccentric roller and the cross bar.

[0016] (2) The reinforcement plate, rotating shaft and rotating plate provided in this scheme can not only increase the angle adjustment range of the eccentric roller, but also increase the connection area and firmness with the crane telescopic arm, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0018] Figure 2 This is a three-dimensional diagram of the eccentric roller structure of the utility model;

[0019] Figure 3 This is a three-dimensional diagram of the reinforcement plate structure of the utility model;

[0020] Figure 4 It is a side view of the positioning rod structure of the utility model;

[0021] Figure 5 for Figure 2 Cross-sectional view of the reinforced casing.

[0022] Description of the numbers in the figure:

[0023] 1 telescopic arm outer tube, 2 telescopic arm inner rod, 3 reinforcement plate, 31 rotating shaft, 32 connecting end, 33 plug hole, 34 latch, 35 first nut, 36 positioning hole, 4 turntable, 41 support arm, 5 eccentric roller, 51 bracket, 52 sealed bearing, 53 reinforcement sleeve, 54 sleeve hole, 6 cross bar, 61 threaded rod, 62 second nut, 7 positioning rod, 71 adsorption ring, 72 anti-slip cap. DETAILED DESCRIPTION

[0024] 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.

[0025] Example 1

[0026] See also Figure 1-5A crane telescopic arm structure includes a telescopic arm outer tube 1 and a telescopic arm inner rod 2. The telescopic arm outer tube 1 and the telescopic arm inner rod 2 can be slidably matched by a slider assembly or a rolling assembly to form a crane telescopic arm. The crane telescopic arm is one of the important components of the crane, which is used to support the position of the lifting wire rope, and then the wire rope is wound up so that the hook at one end of the wire rope can lift the object. Its composition structure and working principle are well known to those skilled in the art. The telescopic arm outer tube 1 and the telescopic arm inner rod 2 are slidably connected, and the surface of the telescopic arm inner rod 2 is The surface contact is connected with a rotatable eccentric roller 5, which is used to hold up the telescopic arm inner rod 2, so that when the telescopic arm inner rod 2 moves along the telescopic arm outer tube 1, the eccentric roller 5 rotates and jumps under the action of friction, and this jump will push the telescopic arm inner rod 2 to periodically eliminate the squeezing force on the slider or ball in the telescopic arm outer tube 1, that is, the slider is in a periodic no-load state, compared with the prior art, it has the advantages of reducing the wear time of the slider and extending the service life of the slider. The surface of the eccentric roller 5 is provided with a bracket 51, and the two ends of the eccentric roller 5 are fixedly sleeved with axially symmetrical sealed bearings 52, and the sealed bearings 52 It can avoid the wear between the eccentric roller 5 and the cross bar 6 during rotation. The inner ring of the sealed bearing 52 is fixedly sleeved with a reinforcing sleeve 53. The inner wall of the reinforcing sleeve 53 is in contact with the cross bar 6. Both ends of the cross bar 6 are provided with threaded rods 61, and the threaded rods 61 are detachably connected to the symmetrical support arms 41 through the second nut 62, so that the cross bar 6 has the function of disassembly and assembly, which is convenient for the later disassembly, maintenance or replacement of the eccentric roller 5. One end of the support arm 41 is fixedly connected with a turntable 4. The turntable 4 and the support arm 41 are rotated to adjust the support angle position of the eccentric roller 5. The turntable 4 is made of iron metal, and the surface is adsorbed The surface of the ring 71 is in contact with adsorption, and the insertion position of the positioning rod 7 can be automatically fixed by the adsorption ring 71. The positioning rod 7 is inserted into the surface of the turntable 4. The center position of the turntable 4 is rotatably connected with the rotating shaft 31. The surface of the rotating shaft 31 is connected to the first nut 35 through a thread. The surface of the rotating shaft 31 is provided with a socket 33, and the inner wall of the socket 33 is plugged with a pin 34. The pin 34 is a detachable structure to prevent the first nut 35 from loosening. One end of the rotating shaft 31 is provided with a connecting end 32, and the surface of the connecting end 32 is fixedly sleeved with a reinforcing plate 3, and the surfaces of the connecting end 32 and the reinforcing plate 3 are fixedly connected to the surface of the outer tube 1 of the telescopic arm.

[0027] An axially penetrating sleeve hole 54 is provided at one end of the reinforcing sleeve 53, and the inner wall of the sleeve hole 54 is in contact with and connected to the surface of the cross bar 6. The cross-sectional shapes of the sleeve hole 54 and the cross bar 6 are both polygonal, and the end face of the cross bar 6 is in contact and extruded with the surface of the support arm 41. The polygonal cross bar 6 and the sleeve hole 54 allow the inner and outer rings of the sealed bearing 52 to rotate stably, thereby allowing the eccentric roller 5 to rotate stably without causing rotational wear between the cross bar 6. Axially symmetrical eccentric bearing mounting grooves are provided at both ends of the eccentric roller 5, and an axially penetrating mounting hole is provided at the center position of the eccentric bearing mounting groove. The inner wall of the mounting hole is in contact with and connected to the surface of the reinforcing sleeve 53, which is convenient for the installation and fixation of the symmetrical sealed bearings 52, and at the same time facilitates the assembly between the two sealed bearings 52 and the reinforcing sleeve 53.

[0028] One end of the positioning rod 7 is fixedly connected with an anti-slip cap 72, and one end of the anti-slip cap 72 is fixedly inlaid with an adsorption ring 71. The adsorption ring 71 is made of a strong magnet. The positioning rod 7 is used to fix the rotation adjustment position of the turntable 4. The surface of the reinforcement plate 3 is provided with positioning holes 36. The positioning holes 36 are distributed in a circular shape with equal intervals. The inner wall of the positioning hole 36 is in contact with one end of the positioning rod 7. The positioning hole 36 facilitates the insertion and fixation of the positioning rod 7.

[0029] When the inner rod 2 of the telescopic arm of the crane is extended or retracted, the inner rod 2 of the telescopic arm drives the eccentric roller 5 to rotate through friction. The rotation of the eccentric roller 5 causes the inner and outer rings of the sealed bearing 52 to rotate, thereby avoiding rotational wear between the cross bar 6. When it is necessary to adjust the supporting angle position of the eccentric roller 5, the positioning rod 7 can be manually removed so that the turntable 4 can drive the supporting arm 41 to rotate freely. After the eccentric roller 5 is rotated to a suitable lifting position angle, the positioning rod 7 can be manually inserted into the positioning hole 36 that is concentric and coaxial with the eccentric roller 5 to fix the adjusted position.

[0030] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A crane telescopic arm structure, comprising a telescopic arm outer tube (1) and a telescopic arm inner rod (2), wherein the telescopic arm outer tube (1) and the telescopic arm inner rod (2) are slidably connected, and characterized in that: The surface of the inner rod (2) of the telescopic arm is in contact with a rotatable eccentric roller (5), the surface of the eccentric roller (5) is provided with a bracket (51), the two ends of the eccentric roller (5) are fixedly sleeved with axially symmetrical sealed bearings (52), the inner ring of the sealed bearing (52) is fixedly sleeved with a reinforcing sleeve (53), the inner wall of the reinforcing sleeve (53) is in contact with a cross bar (6), both ends of the cross bar (6) are provided with threaded rods (61), and the threaded rod (61) is screwed through a second nut (6 2) a symmetrical support arm (41) is detachably connected, one end of the support arm (41) is fixedly connected to a turntable (4), a positioning rod (7) is inserted into the surface of the turntable (4), a rotating shaft (31) is rotatably connected to the center of the turntable (4), one end of the rotating shaft (31) is provided with a connecting end (32), a reinforcing plate (3) is fixedly sleeved on the surface of the connecting end (32), and the surfaces of the connecting end (32) and the reinforcing plate (3) are fixedly connected to the surface of the telescopic arm outer tube (1).

2. A crane telescopic arm structure according to claim 1, characterized in that: One end of the reinforcing sleeve (53) is provided with an axially penetrating sleeve hole (54), the inner wall of the sleeve hole (54) is in contact and connected with the surface of the cross bar (6), the cross-sectional shapes of the sleeve hole (54) and the cross bar (6) are both polygonal, and the end face of the cross bar (6) is in contact and extruded with the surface of the support arm (41).

3. The crane telescopic arm structure according to claim 1, characterized in that: The two ends of the eccentric roller (5) are provided with axially symmetrical eccentric bearing installation grooves, and the center position of the eccentric bearing installation groove is provided with an axially penetrating installation hole, and the inner wall of the installation hole is in contact with and connected to the surface of the reinforcing sleeve (53).

4. The crane telescopic arm structure according to claim 1, characterized in that: One end of the positioning rod (7) is fixedly connected to an anti-slip cap (72), one end of the anti-slip cap (72) is fixedly inlaid with an adsorption ring (71), and the adsorption ring (71) is made of a strong magnet.

5. The crane telescopic arm structure according to claim 1, characterized in that: Positioning holes (36) are provided on the surface of the reinforcement plate (3), the positioning holes (36) are distributed in a circular shape with equal intervals, and the inner wall of the positioning hole (36) is in contact with and connected to one end of the positioning rod (7).

6. The crane telescopic arm structure according to claim 1, characterized in that: The surface of the rotating shaft (31) is connected to a first nut (35) via a thread, and the surface of the rotating shaft (31) is provided with an insertion hole (33), and the inner wall of the insertion hole (33) is plugged with a latch pin (34).

7. The crane telescopic arm structure according to claim 4, characterized in that: The rotating disk (4) is made of iron metal, and its surface is in contact with and adsorbed on the surface of the adsorption ring (71).

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