Pin shaft assembly and crane

Abstract

The utility model provides a pin shaft assembly suitable for a crane. The pin shaft assembly comprises a fixedly arranged shaft sleeve, a pin shaft sleeved in the shaft sleeve, and a baffle fixedly arranged at the end parts of the shaft sleeve and the pin shaft and used for axially positioning the pin shaft, a shaft sleeve clamping groove is formed in the end of the shaft sleeve, a pin shaft clamping groove is formed in the end of the pin shaft, and the baffle is embedded and fixed in the shaft sleeve clamping groove and the pin shaft clamping groove. The utility model further provides a crane which comprises the pin shaft assembly, a rotary table and a suspension arm. The pin shaft assembly is connected with the shaft sleeve clamping groove and the pin shaft clamping groove through the baffle and plays a role in mechanical limiting, so that force generated in the rotating process of the suspension arm is borne by the baffle and the shaft sleeve, a connecting piece is prevented from being damaged under the action of shearing force in the operation process, and the pin shaft is effectively prevented from rotating.

Description

Technical Field

[0001] The utility model relates to the field of construction machinery, in particular to a pin assembly and a crane having the pin assembly. Background Art

[0002] In the prior art, the boom of a mobile crane is hinged to the turntable by a pin. A baffle is provided at the end of the pin and a straight edge is machined. The straight edge cooperates with the baffle for axial positioning, and then the baffle is fixed to the turntable by bolts, so as to prevent the pin from rotating; however, when the crane performs a luffing operation, the frictional force generated by the rotation of the boom around the turntable drives both the pin and the baffle to have a tendency to rotate together with the boom, generating a shear force whose acting direction intersects the axial direction of the bolt. The bolts fixing the baffle will be subjected to the shear force. Especially when luffing with heavy load, the shear force on the bolts is too large and there is a risk of being damaged. Summary of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a pin assembly applicable to a crane and a crane, which adopt mechanical action for limiting, avoid the shear force acting on the connecting piece, and can reliably and effectively prevent the pin from rotating.

[0004] An embodiment of one aspect of the utility model provides a pin assembly, including a fixedly arranged bushing, a pin sleeved in the bushing, and a baffle fixedly installed at the ends of the bushing and the pin for axially positioning the pin; a bushing slot is opened at the end of the bushing, a pin slot is opened at the end of the pin, and the baffle is embedded and fixed in the bushing slot and the pin slot.

[0005] Further, a through first connection hole is opened on the baffle, a first fixing hole is arranged at the bottom of the bushing slot, and the pin assembly further includes a first connecting piece, and the first connecting piece passes through the first connection hole and is inserted into the first fixing hole to fix the baffle to the bushing.

[0006] Further, the first connecting piece is a bolt, and the first connection hole and the first fixing hole are threaded holes corresponding to the first connecting piece.

[0007] Further, a through second connection hole is further opened on the baffle, a second fixing hole is arranged at the bottom of the pin slot, and the pin assembly further includes a second connecting piece, and the second connecting piece passes through the second connection hole and is inserted into the second fixing hole to fix the baffle to the pin.

[0008] Further, the second connecting piece is a bolt, and the second connection hole and the second fixing hole are threaded holes corresponding to the second connecting piece.

[0009] Further, the widths of the pin slot and the bushing slot are equal, the length directions are the same and they are aligned with each other.

[0010] Further, the number of the first fixing holes is at least two, and they are arranged radially along the end of the bushing slot; the number of the second fixing holes is at least two, and they are arranged radially along the end of the pin slot.

[0011] Further, at least two of the first fixing holes and at least two of the second fixing holes are all arranged on the same straight line.

[0012] A crane includes the above-mentioned pin assembly, turntable and boom, and the boom is rotatably connected to the turntable through the pin assembly.

[0013] Further, the bushing of the pin assembly is fixed in the turntable, and the boom is sleeved on the bushing rotatably around the bushing.

[0014] For the pin assembly and the crane provided by the present utility model, the baffle is connected to the bushing slot and the pin slot through the connecting piece bolt, playing a mechanical limiting role. When the boom of the crane performs a luffing action, the force generated during the rotation process will be transmitted from the pin to the bushing fixed on the turntable, and be borne by the baffle and the bushing, thereby avoiding the damage of the connecting piece bolt due to the shear force during the operation process, and reliably and effectively playing the role of preventing the pin from rotating. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0016] Figure 1 A three-dimensional schematic diagram of the pin assembly provided for a preferred embodiment of the present utility model.

[0017] Figure 2 For Figure 1 The front view of the pin assembly shown.

[0018] Figure 3 For Figure 1 The cross-sectional view of the pin assembly shown.

[0019] In the figure: turntable 1; bushing 11; end sleeve 11A; middle sleeve 11B; bushing slot 111; first fixing hole 112; boom 2; pin 3; pin slot 31; second fixing hole 311; baffle 4; first connection hole 41; second connection hole 42; first connecting piece 51; second connecting piece 52. Detailed Embodiments

[0020] The specific embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the description of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0021] As Figure 1 shown, an embodiment of one aspect of the present application provides a pin assembly for a crane, including a bushing 11 fixedly arranged on a turntable 1, a pin 3 sleeved in the bushing 11 for hinging the turntable 1 and a boom 2, and a baffle 4 fixedly installed at the ends of the bushing 11 and the pin 3 for axially positioning the pin 3; a bushing slot 111 is formed at the end of the bushing 11, a pin slot 31 is formed at the end of the pin 3, and the baffle 4 is embedded and fixed in the bushing slot 111 and the pin slot 31 through a connecting member. The pin assembly is installed on the crane turntable 1, and the boom 2 of the crane is rotatably installed on the pin assembly.

[0022] The pin assembly further includes a first connecting member 51 for connecting the baffle 4 and the bushing 11 and a second connecting member 52 for connecting the baffle 4 and the pin 3. The first connecting member 51 and the second connecting member 52 can be any one or more of various fixing members such as bolts. In this embodiment, the first connecting member 51 and the second connecting member 52 are preferably bolts.

[0023] A first fixing hole 112 is provided at the bottom of the bushing slot 111, and the number of the first fixing holes 112 is at least two, arranged radially along the end of the bushing slot 111; a second fixing hole 311 is provided at the bottom of the pin slot 31, and the number of the second fixing holes 311 is also at least two, arranged radially along the end of the pin slot 31. The pin slot 31 and the bushing slot 111 have the same width, the same length direction and are aligned with each other, and the first fixing hole 112 and the second fixing hole 311 are both arranged on the same straight line.

[0024] As Figures 1 to 2 shown, the baffle 4 is provided with a through first connection hole 41 and a second connection hole 42. The first connection hole 41 is arranged corresponding to the first fixing hole 112, the second connection hole 42 is arranged corresponding to the second fixing hole 311, and the first connection hole 41 and the second connection hole 42 are arranged on the same straight line. The first connection hole 41 and the first fixing hole 112 are threaded holes corresponding to the first connecting member 51, and the second connection hole 42 and the second fixing hole 311 are threaded holes corresponding to the second connecting member 52.

[0025] The first connecting member 51 passes through the first connecting hole 41 and is inserted into the first fixing hole 112 to fixedly connect the baffle 4 and the bushing 11; the second connecting member 52 passes through the second connecting hole 42 and is inserted into the second fixing hole 311 to fixedly connect the baffle 4 and the pin shaft 3.

[0026] In summary, a pin shaft assembly for a crane provided by the above embodiment of the present utility model is provided. The first connecting hole 41 and the second connecting hole 42 are provided on the baffle 4, the first fixing hole 112 is provided on the bushing slot 111, and the second fixing hole 311 is provided at the end of the pin shaft slot 31. A bolt is used as a connecting member to pass through the connecting hole and insert it into the corresponding fixing hole to fixedly connect the baffle 4 with the bushing slot 111 and the pin shaft slot 31 to achieve a mechanical limiting effect; when the boom 2 of the crane performs a luffing action, the force generated during the rotation process will be transmitted from the pin shaft 3 to the fixed bushing 11, and the shearing force is borne by the bushing 11 and the baffle 4, thereby avoiding the damage of the connecting member bolt due to the shearing force during the operation process, and reliably and effectively achieving the effect of preventing the pin shaft from rotating.

[0027] As Figure 1 shown, an embodiment of another aspect of the present utility model provides a crane, including the pin shaft assembly installed on the crane turntable 1, the turntable 1, and the boom 2 described above. The boom 2 is rotatably connected to the turntable 1 through the pin shaft assembly; further, as Figure 3 shown, the bushing 11 of the pin shaft assembly includes an end sleeve 11A and a middle sleeve 11B. The end sleeve 11A can be fixed on the turntable 1 by various methods such as welding, and the middle sleeve 11B is sleeved on the pin shaft 3 and embedded in the turntable 1; the middle sleeve 11B can rotate relative to the pin shaft 3 and is fixed relative to the boom 2, and the boom 2 can rotate around the middle sleeve 11B of the bushing 11 and is sleeved on the middle sleeve 11B.

[0028] When the crane performs a luffing action, the boom 2 rotates around the middle sleeve 11B of the bushing 11. When rotating, the friction force drives the pin shaft 3 and the baffle 4 to have a tendency to rotate together with the boom 2, generating a shearing force acting in the rotational direction and intersecting the axial direction of the bolt. The baffle 4 is connected to the pin shaft slot 31 and the bushing slot 111 respectively through connecting members such as bolts to play a mechanical limiting role, thereby preventing the pin shaft 3 from rotating along with the boom 2; the pin shaft 3 is fixedly connected to the turntable 1 through the pin shaft assembly. At this time, the shearing force generated by the rotation is transferred from the pin shaft 3 to the bushing 11 fixed on the turntable 1, and is borne by the bushing 11 and the baffle 4, thereby avoiding the damage of connecting members such as bolts due to large shearing forces during the rotation of the boom 2, reducing the risk of damage to connecting members such as bolts, and reliably and effectively preventing the pin shaft from rotating.

[0029] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A pin assembly, characterized in that: It includes a fixed sleeve, a pin sleeved in the sleeve, and a baffle fixedly mounted on the ends of the sleeve and the pin for axially positioning the pin; the sleeve end is provided with a sleeve slot, the pin end is provided with a pin slot, and the baffle is embedded and fixed in the sleeve slot and the pin slot.

2. The pin assembly according to claim 1, characterized in that: The baffle is provided with a through first connecting hole, the bottom of the sleeve slot is provided with a first fixing hole, and the pin assembly also includes a first connecting piece, which passes through the first connecting hole and is inserted into the first fixing hole to fix the baffle to the sleeve.

3. The pin assembly according to claim 2, characterized in that: The first connecting member is a bolt, and the first connecting hole and the first fixing hole are threaded holes corresponding to the first connecting member.

4. The pin assembly according to claim 2, characterized in that: The baffle is also provided with a through second connecting hole, a second fixing hole is provided at the bottom of the pin shaft slot, and the pin shaft assembly also includes a second connecting piece, which passes through the second connecting hole and is inserted into the second fixing hole to fix the baffle to the pin shaft.

5. The pin assembly according to claim 4, characterized in that: The second connecting member is a bolt, and the second connecting hole and the second fixing hole are threaded holes corresponding to the second connecting member.

6. The pin assembly according to claim 4, characterized in that: The pin slot and the sleeve slot have equal widths, consistent length directions and are aligned with each other.

7. The pin assembly according to claim 6, characterized in that: The number of the first fixing holes is at least two, which are arranged along the radial direction of the end of the sleeve slot; the number of the second fixing holes is at least two, which are arranged along the radial direction of the end of the pin slot.

8. The pin assembly according to claim 7, characterized in that: The at least two first fixing holes and the at least two second fixing holes are arranged on the same straight line.

9. A crane, characterized in that: It comprises a pin assembly, a turntable and a suspension arm as described in any one of claims 1 to 8, wherein the suspension arm is connected to the turntable via the pin assembly so as to be relatively rotatable.

10. The crane according to claim 9, characterized in that The shaft sleeve of the pin shaft assembly is fixed in the turntable, and the suspension arm is sleeved on the shaft sleeve so as to be rotatable around the shaft sleeve.

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