Suspension arm root section pin shaft mounting device

Abstract

The utility model provides a suspension arm root section pin shaft installation device which comprises a first structural part, a second structural part and a pin shaft, the second structural part is rotatably connected with the first structural part through the pin shaft, a limiting device is fixedly arranged on the outer side wall of the first structural part, the limiting device comprises a first limiting plate and a limiting block, and the limiting plate is fixedly connected with the limiting block. A through hole is formed in the center of the first limiting plate, the first limiting plate is provided with a limiting part, limiting blocks are arranged on the two sides of the limiting part respectively, a boss matched with the through hole is arranged on one side of the pin shaft, a groove is formed in the other side of the pin shaft, and a second limiting plate is fixedly arranged on the other outer side wall of the first structural part. The second limiting plate is provided with a protrusion matched with the groove, and the structure is simple, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of pin fixing devices, and particularly relates to a pin installation device for the root section of a boom. Background Art

[0002] With the continuous development of social economy, cranes are used in many industries such as construction, manufacturing, and transportation. As an important material handling equipment, the reliability of pin connection is directly related to the safety of the crane. If the pin can move with the load, it may gradually loosen due to reasons such as vibration and load changes, and finally fall off. A fixed pin can maintain a stable connection state for a long time and will not shift due to changes in external forces, thereby effectively preventing safety accidents caused by pin movement and improving the safety of the crane.

[0003] For example, in the patent document with the patent application number 202321008327.4 and the publication date of November 14, 2023, a pin fixing device applicable to tower cranes is disclosed, which includes a first structural member, a second structural member, and a pin body. The second structural member is rotationally connected to the first structural member through the pin body. A pin shoulder is installed at one end of the pin body. A groove for the pin shoulder to be inserted into is provided on one side of the first structural member, and a limiting block that fits with the pin shoulder is symmetrically and rotationally installed on the side wall of the first structural member. An anti-deflection component is installed between the two limiting blocks. A retaining sleeve is sleeved at the position of the pin body far from the pin shoulder. The retaining sleeve is in contact with the outer side wall of the first structural member, and a positioning component is installed between the retaining sleeve and the pin body, which is convenient for axially limiting both ends of the tower crane pin, so that the tower crane pin will not move axially, thereby greatly improving the stability of the tower crane pin.

[0004] In the above document, only two limiting plates are in contact with the pin shoulder of the pin to axially limit one end of the pin, and a retaining sleeve is provided at the end far from the pin shoulder, and a screw is passed through the retaining sleeve and the pin hole of the pin, so that the pin will not move axially. During long-term use, as the first structural member and the second structural member rotate relative to each other, since the two limiting plates are connected only by a bolt fixing method, the bolt is prone to loosen after long-term use, resulting in the position of the limiting plate shifting, thus deteriorating the axial limiting effect on the pin. And since the limiting plate is fixed by two fixed shafts through bolts, during the rotation of the first structural member and the second structural member, one end of the pin will be affected by the rotational force, causing an upward rotation trend at the connection of the limiting plate, so that the limiting plate cannot better limit the pin, thereby increasing the risk of pin rotation or movement. Summary of the Invention

[0005] The utility model provides a pin installation device for the root section of a boom, which has a simple structure and is safe and reliable.

[0006] To achieve the above object, the technical solution of the utility model is: a pin installation device for the root section of a boom, comprising a first structural member, a second structural member and a pin. The second structural member is rotatably connected to the first structural member through the pin. A limiting device is fixedly arranged at one side wall of the first structural member. The limiting device comprises a first limiting plate. A through hole is arranged in the center of the first limiting plate. A boss matching the through hole is arranged on one side of the pin. A groove recessed towards one side of the pin is arranged on the other side of the pin. A second limiting plate is fixedly arranged at the other outer side wall of the first structural member. A protrusion matching the groove is arranged on the second limiting plate.

[0007] With the above settings, when the second structural member is rotatably connected to the first structural member through the pin, a first limiting plate and a second limiting plate are respectively fixedly arranged on one outer side wall of the first structural member. The axial positioning of the pin is completed by the cooperation of the through hole on the first limiting plate and the boss of the pin, and the cooperation of the protrusion on the second limiting plate and the groove of the pin. The boss of the pin can limit the axial rotation of the pin, and the groove of the pin radially limits the other end of the pin, so that the structure is simple and the reliability is good.

[0008] Further, the limiting device further comprises a limiting block. The limiting block is fixedly arranged on one outer side wall of the first structural member. A limiting portion extends outward from the side where the first limiting plate is arranged. A limiting groove corresponding to the limiting portion is arranged on the limiting block.

[0009] With the above settings, the limiting block is arranged in the limiting groove and then the first limiting plate is fixed on the first structural member to realize the fixation. The limiting groove can further reliably limit the axial rotation of the limiting block.

[0010] Further, the height of the boss is the same as the thickness of the first limiting plate.

[0011] With the above settings, by arranging a boss at the position where the pin extends out of the first structural member and the height of the boss is the same as the thickness of the first limiting plate, it can prevent the pin from falling off at the first limiting plate. The cooperation with the protrusion on the second limiting plate and the groove of the pin can prevent the pin from falling off at the second limiting plate. The cooperation of the two can limit the pin at the connection of the first structural member and the second structural member, and can ensure that the pin does not displace when stressed, thus maintaining the stability of the connection.

[0012] Further, the pin is of a cylindrical structure, and the cross section of the boss is hexagonal.

[0013] With the above settings, the cylindrical pin can easily extend into the first structural member and the second structural member, and can provide a uniform contact surface, making the load distribution more uniform. The boss with a hexagonal structure has excellent stability and provides six contact surfaces for the first limiting plate, which can effectively disperse the bearing capacity applied to the pin and enhance the stability.

[0014] Further, the cross-section of the through hole is hexagonal.

[0015] With the above arrangement, by fixing the first limiting plate, the hexagonal through hole provides six contact surfaces for the hexagonal structure, and the six contact surfaces evenly disperse the forces in all directions, ensuring the stability of the through hole structure and effectively preventing the pin shaft from rotating between the first structural member and the second structural member.

[0016] Further, two or more bolts are arranged along the outer side of the through hole on the first limiting plate, and screw holes corresponding to the bolts are arranged on the first structural member.

[0017] With the above arrangement, the first limiting plate is fixedly connected to the first structural member through bolts. The fixed connection by bolts can ensure the axial rotation of the first limiting plate and make the force more uniform. The bolts are arranged along the outer side of the through hole, which can effectively disperse the load and reduce the local deformation caused by concentrated load.

[0018] Further, two or more bolts are arranged on the outer side of the second limiting plate, and screw holes corresponding to the bolts are arranged on the second structural member.

[0019] With the above arrangement, the second limiting plate is fixedly connected to the second structural member through bolts. The bolts arranged on the outer side can effectively limit the protrusion on the second limiting plate in the groove of the pin shaft, thereby effectively restricting the movement of the second limiting plate, and thus fixing the second limiting plate on the first structural member.

[0020] Further, the axes of the first limiting plate, the second limiting plate and the pin shaft are aligned.

[0021] With the above arrangement, the axes of the first limiting plate, the second limiting plate and the pin shaft are aligned. The alignment

[0022] can ensure the uniform distribution of forces, and can significantly reduce the additional load caused by misalignment, thereby reducing the wear between components, enhancing stability and prolonging the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a partial structural schematic diagram of the present utility model.

[0024] Figure 2 It is a front view of the first structural member and the first limiting plate in the present utility model.

[0025] Figure 3 It is a front view of the second structural member and the second limiting plate in the present utility model.

[0026] Figure 4 It is a three-dimensional view of the pin shaft in the present utility model.

[0027] Figure 5 This is a schematic diagram of the connection between the limit block and the limit part in the present utility model.

[0028] Explanation of the reference numerals in the drawings: 1 - the first structural member; 2 - the second structural member; 3 - the pin shaft; 31 - the convex platform; 32 - the groove; 4 - the limiting device; 41 - the first limiting plate; 411 - the limiting part; 42 - the limit block; 421 - the limiting groove; 5 - the second limiting plate; 51 - the protrusion. Specific embodiments

[0029] As Figures 1-4 shown, a pin shaft mounting bracket for the root section of a boom includes a first structural member 1, a second structural member 2, and a pin shaft 3. The second structural member 2 is rotatably connected to the first structural member 1 through the pin shaft 3. A limiting device 4 is fixedly arranged on the outer side wall of the first structural member 1. The limiting device 4 includes a first limiting plate 41 and a limit block 42. A through hole is provided in the center of the first limiting plate 41. The first limiting plate 41 is provided with a limiting part 411. Limit blocks 42 are respectively arranged on both sides of the limiting part 411. A convex platform 31 matching the through hole is arranged on one side of the pin shaft 3, and a groove 32 is arranged on the other side of the pin shaft 3. A second limiting plate 5 is fixedly arranged on the other outer side wall of the first structural member 1. The second limiting plate 5 is provided with a protrusion 51 matching the groove 32. When the second structural member 2 is rotatably connected to the first structural member 1 through the pin shaft 3, the first limiting plate 41 and the second limiting plate 5 are respectively fixedly arranged on the outer side wall of the first structural member 1. The axial positioning of the pin shaft 3 is completed by the cooperation of the through hole on the first limiting plate 41 and the convex platform 31 of the pin shaft 3, and the cooperation of the protrusion 51 of the second limiting plate 5 and the groove 32 of the pin shaft 3, preventing the pin shaft 3 from moving and rotating between the first structural member 1 and the second structural member 2. And a limiting part 411 is arranged on the first limiting plate 41. In this embodiment, the first structural member is a hinge ear of a boom, and the second structural member is a hinge seat of another boom.

[0030] As Figure 1 and Figure 5 shown, the limit block 42 is fixedly arranged on an outer side wall of the first structural member 1. The limiting part 411 extends outwardly on one side where the first limiting plate 42 is arranged. A limiting groove 421 corresponding to the limiting part 411 is arranged on the limit block 42. The first limiting plate 41 is fixed by the limit block 42. During installation, the limiting part 411 of the first limiting plate is snapped into the limiting groove 421, and then the first limiting plate is fixed on the first structural member.

[0031] As Figures 1-2As shown, a boss 31 is provided at the position where the pin shaft 3 extends out of the first structural member 1. The height of the boss 31 is the same as the thickness of the first limiting plate 41. By providing the boss 31 at the position where the pin shaft 3 extends out of the first structural member 1 and the height of the boss 31 being the same as the thickness of the first limiting plate 41, it is possible to prevent the pin shaft 3 from falling off at the first limiting plate 41. The cooperation with the protrusion 51 of the second limiting plate 5 and the groove 32 of the pin shaft 3 can prevent the pin shaft 3 from falling off at the second limiting plate 5. The cooperation of the two can limit the pin shaft 3 at the connection of the first structural member 1 and the second structural member 2, ensuring that the pin shaft 3 does not displace under force, thereby maintaining the stability of the connection.

[0032] The axes of the first limiting plate 41, the second limiting plate 5, and the pin shaft 3 are the same, which can ensure uniform distribution of force, and can significantly reduce the additional load caused by misalignment, thereby reducing wear between components, enhancing stability, and extending the service life of the device.

[0033] As Figure 2 and Figure 4 shown, the cross-section of the through-hole and the cross-section of the boss are hexagonal, and the main body of the pin shaft is a cylindrical structure. By fixing the first limiting plate 41, the hexagonal structure of the through-hole provides six contact surfaces. The six contact surfaces evenly disperse the forces in all directions, ensuring the stability of the through-hole structure, and effectively preventing the pin shaft 3 from rotating between the first structural member 1 and the second structural member 2.

[0034] As Figure 2 and Figure 3 shown, two or more bolts are provided along the outer side of the through-hole on the first limiting plate 41, and screw holes corresponding to the bolts are provided on the first structural member 1. In this embodiment, three bolts are provided on the first limiting plate 41, and the three bolts are evenly arranged on the outer side wall of the through-hole. The first limiting plate 41 is fixedly connected to the first structural member 1 through the bolts. The fixed connection by bolts can make the force more uniform. The bolts are arranged along the outer side of the through-hole, which can effectively disperse the load and reduce local deformation caused by concentrated load.

[0035] As Figure 3 shown, two or more bolts are provided on the outer side of the second limiting plate 5, and screw holes corresponding to the bolts are provided on the second limiting plate 5. The second limiting plate 5 is fixedly connected to the second structural member 2 through the bolts. In this embodiment, four bolts are provided on the second limiting plate 5, and the four bolts are evenly distributed around the circumference of the through-hole. By the bolts provided on the outer side, the movement of the second limiting plate 5 can be effectively restricted, so that the second limiting plate 5 is fixedly arranged on the first structural member 1.

[0036] Working principle of the utility model: The first structural member 1 and the second structural member 2 are connected by a pin shaft 3. The boss 31 of the pin shaft 3 extends out of the outer side wall of the first structural member 1. A second limiting plate 5 is arranged on one side of the groove 32 of the pin shaft 3. The protrusion 51 of the second limiting plate 5 is fitted with the groove 32 of the pin shaft 3, and then the second limiting plate 5 is fixed on the outer side wall of the first structural member 1 by bolts. A first limiting plate 41 is arranged on the side where the boss 31 extends out. The through hole of the first limiting plate 41 is fitted with the boss 31 of the pin shaft 3, and then the first limiting plate 41 is fixed on the outer side wall of the first structural member 1 by bolts. And limiting blocks 42 are fixedly arranged on both sides of the limiting part 411 of the first limiting plate 41. The arrangements of the first limiting plate 41 and the second limiting plate 5 can prevent the pin shaft 3 from moving and rotating between the first structural member 1 and the second structural member 2, and the arrangement of the limiting blocks 42 can enhance the fixing and limiting effects of the first limiting plate 41.

Claims

1. A boom root pin installation device, comprising a first structural member, a second structural member and a pin, wherein the second structural member is rotatably connected to the first structural member through the pin, and characterized in that: A limiting device is fixedly arranged at one side wall of the first structural member, and the limiting device includes a first limiting plate, a through hole is arranged in the center of the first limiting plate, a limiting portion is arranged at the first limiting plate, and limiting blocks are arranged on both sides of the limiting portion, a boss matching the through hole is arranged at one side of the pin shaft, and a groove recessed toward one side of the pin shaft is arranged at the other side of the pin shaft, and a second limiting plate is fixedly arranged at the other outer side wall of the first structural member, and the second limiting plate is provided with a protrusion matching the groove.

2. A boom root pin installation device according to claim 1, characterized in that: The limiting device also includes a limiting block, which is fixedly arranged on an outer side wall of the first structural member. A limiting portion is extended outwardly from one side of the first limiting plate, and a limiting groove corresponding to the limiting portion is arranged on the limiting block.

3. The boom root pin installation device according to claim 1, characterized in that: The boss has the same thickness as the first limiting plate.

4. The boom root pin installation device according to claim 1, characterized in that: The pin shaft is a cylindrical structure, and the cross section of the boss is a hexagon.

5. The boom root pin installation device according to claim 1, characterized in that: The cross section of the through hole is hexagonal.

6. The boom root pin installation device according to claim 1, characterized in that: The first limiting plate is provided with more than two bolts along the outer side of the through hole, and the first structural member is provided with screw holes corresponding to the bolts.

7. The boom root pin installation device according to claim 1, characterized in that: More than two bolts are arranged on the outer side of the second limiting plate, and screw holes corresponding to the bolts are arranged on the second structural member.

8. The boom root pin installation device according to claim 1, characterized in that: The first limiting plate, the second limiting plate and the pin shaft have the same axis.

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