Dual limiting device for pin shaft of lifting arm

Abstract

The utility model relates to the technical field of tractor parts, in particular to a lifting arm pin shaft double-limiting device which comprises a pin shaft installed between an inner side installation lug and an outer side installation lug of a lifting arm, and the two ends of the pin shaft extend out of the inner side installation lug and the outer side installation lug respectively. A limiting plate attached to the outer side face of the outer side installation lug is detachably installed on the outer side face of the outer side installation lug, the limiting plate comprises a fixing end and a limiting end which are integrally arranged, the fixing end is detachably installed on the outer side installation lug, the limiting end comprises an upper supporting arm and a lower supporting arm which are oppositely arranged up and down, and a U-shaped limiting notch is formed between the upper supporting arm and the lower supporting arm. The upper notch face of the upper supporting arm and the lower notch face of the lower supporting arm are arranged in parallel, and two flat-bottom notches are formed in the pin shaft. The pin shaft limiting device is convenient to maintain, not only prevents the pin shaft from rotating, but also prevents the pin shaft from displacing in the axial direction, plays a double-limiting role, ensures the limiting accuracy, prolongs the service life of the lifting arm, saves the production cost, and is beneficial to stable operation of equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor parts, in particular to a double limiting device for a lifting arm pin shaft. Background Art

[0002] A tractor is a self-propelled power machine used to tow and drive working machinery to complete various mobile operations. In agricultural applications, tractors are usually used to tow agricultural machinery. With the development of efficient agricultural mechanization, the mass of agricultural machinery towed by high-power wheeled tractors is getting larger and larger, and the requirements for the lifting capacity of tractors are also getting higher and higher. When towing agricultural machinery, tractors usually need to use lifting arms. The lifting arms and lifting rods are hinged through a pin shaft. During use, the pin shaft is required not to rotate. Therefore, as in the structure of the utility model patent with patent number CN21521865U and patent name Tractor Lifting Arm, it is necessary to set an anti-rotation groove to limit the pin shaft to ensure the stability of the work. However, the torque generated by the pin shaft during the work process will work on the anti-rotation groove, resulting in serious wear of the notch of the anti-rotation groove, the notch becomes larger and larger, and the limit is no longer accurate, resulting in a certain degree of rotation of the pin shaft, which is not conducive to the stability of the equipment. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a lifting arm pin shaft double limiting device which can not only effectively prevent the pin shaft from rotating but also prevent the pin shaft from generating axial displacement.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a double limit device for a lifting arm pin shaft, comprising a pin shaft installed between an inner mounting ear and an outer mounting ear of the lifting arm, the two ends of the pin shaft respectively extend from the inner mounting ear and the outer mounting ear, and the outer side surface of the outer mounting ear is detachably mounted with a limit plate fitted therewith, the limit plate comprises an integrally arranged fixed end and a limit end, the fixed end is detachably mounted on the outer mounting ear, the limit end comprises an upper support arm and a lower support arm arranged opposite to each other up and down, the upper support arm A U-shaped limiting groove is formed between the arm and the lower arm, the upper groove surface of the upper arm and the lower groove surface of the lower arm are arranged in parallel, and the pin shaft is provided with two flat-bottom grooves used in conjunction with the upper groove surface and the lower groove surface, and the two flat-bottom grooves are arranged at an interval of 180°. The thickness of the upper arm and the lower arm is equal to the width of the flat-bottom groove, the spacing between the upper groove surface and the lower groove surface is equal to the spacing between the flat bottoms of the two flat-bottom grooves, and the depth of the U-shaped limiting groove is greater than the diameter of the pin shaft.

[0005] As a preferred technical solution, the fixed end is provided with a through hole, and the outer surface of the outer mounting ear is provided with a threaded blind hole corresponding to the through hole. The screw passes through the through hole from the outer surface of the outer mounting ear and is threadedly installed in the threaded blind hole, and the limit plate is detachably installed on the outer mounting ear.

[0006] As a preferred technical solution, a protective gasket is installed between the screw head of the screw and the limiting plate.

[0007] As a preferred technical solution, a through hole is provided at the fixed end, and a countersunk through hole corresponding to the through hole is provided on the inner side surface of the outer mounting ear. The bolt passes through the through hole from the outer side surface of the outer mounting ear and is fixedly connected with a fastening nut located in the countersunk through hole. The limit plate is detachably mounted on the outer mounting ear, and a locking nut is threadedly mounted on the outer side of the fastening nut in the countersunk through hole. The outer surface of the locking nut and the outer end surface of the screw rod of the bolt are both recessed in the inner side surface of the outer mounting ear.

[0008] As a preferred technical solution, an elastic gasket is installed between the bolt head of the bolt and the limiting plate.

[0009] As a preferred technical solution, the fixed end of the limit plate is provided with a large arc surface, and the ends of the upper support arm and the lower support arm are respectively provided with small arc surfaces.

[0010] Due to the adoption of the above technical scheme, the double limit device of the lifting arm pin shaft comprises a pin shaft installed between the inner mounting ear and the outer mounting ear of the lifting arm, the inner mounting ear and the outer mounting ear are extended from both ends of the pin shaft respectively, and the outer side surface of the outer mounting ear is detachably installed with a limit plate fitted therewith, the limit plate comprises an integrally arranged fixed end and a limit end, the fixed end is detachably installed on the outer mounting ear, the limit end comprises an upper support arm and a lower support arm arranged relatively up and down, a U-shaped limit groove is formed between the upper support arm and the lower support arm, the upper groove surface of the upper support arm and the lower groove surface of the lower support arm are arranged in parallel, and two flat bottom grooves used in conjunction with the upper groove surface and the lower groove surface are opened on the pin shaft, the two flat bottom grooves are arranged 180° apart, and the thickness of the upper support arm and the lower support arm is 180°. The length of the U-shaped limit slot is equal to the width of the flat-bottom slot, the spacing between the upper slot surface and the lower slot surface is equal to the spacing between the flat bottoms of the two flat-bottom slots, and the depth of the U-shaped limit slot is greater than the diameter of the pin shaft; the beneficial effects of the utility model are: the traditional anti-rotation slot integrally arranged on the lifting arm is replaced with a detachable limit plate, and when the limit plate is seriously worn, a new limit plate can be replaced at any time to continue to ensure the accuracy of the limit, and the limit plate is detachably installed on the outer mounting ear of the lifting arm through the fixed end, and the upper support arm and the lower support arm extend into the two flat-bottom slots of the pin shaft to clamp the pin shaft to prevent the pin shaft from rotating, and because the thickness of the upper support arm and the lower support arm is consistent with the width of the flat-bottom slot, the displacement of the pin shaft is also prevented from the axial direction, playing a double limit role. The utility model is easy to maintain, ensures the accuracy of the limit, prolongs the service life of the lifting arm, saves production costs, and is conducive to the stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0012] Figure 1 This is one of the structural schematic diagrams of the first embodiment of the utility model;

[0013] Figure 2 This is the second structural diagram of the first embodiment of the utility model;

[0014] Figure 3 yes Figure 1 A-direction view in the figure;

[0015] Figure 4 yes Figure 1 B view in the figure;

[0016] Figure 5 It is a partial exploded view of the first embodiment of the utility model;

[0017] Figure 6 It is a structural schematic diagram of the second embodiment of the utility model;

[0018] Figure 7yes Figure 6 A partial enlarged view of point I in the middle.

[0019] In the figure: 1-inner mounting ear; 2-outer mounting ear; 3-pin shaft; 4-limiting plate; 5-upper support arm; 6-lower support arm; 7-U-shaped limiting slot; 8-upper slot surface; 9-lower slot surface; 10-flat bottom slot; 11-screw; 12-protective gasket; 13-bolt; 14-fastening nut; 15-locking nut; 16-large arc surface; 17-small arc surface. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and examples. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Needless to say, those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0021] Embodiment 1:

[0022] like Figures 1 to 5As shown together, the double limiting device of the lifting arm pin shaft comprises a pin shaft 3 installed between the inner mounting ear 1 and the outer mounting ear 2 of the lifting arm, the inner mounting ear 1 and the outer mounting ear 2 are extended from the two ends of the pin shaft 3 respectively, the outer side surface of the outer mounting ear 2 is detachably installed with a limiting plate 4 fitted therewith, the limiting plate 4 comprises an integrally arranged fixed end and a limiting end, the fixed end is detachably installed on the outer mounting ear 2, the limiting end comprises an upper support arm 5 and a lower support arm 6 arranged relatively up and down, a U-shaped limiting notch 7 is formed between the upper support arm 5 and the lower support arm 6, the upper notch surface 8 of the upper support arm 5 and the lower notch surface 9 of the lower support arm 6 are arranged in parallel, two flat-bottomed notches 10 used in conjunction with the upper notch surface 8 and the lower notch surface 9 are opened on the pin shaft 3, the two flat-bottomed notches 10 are arranged 180° apart, the upper support arm 5 and the lower support arm The thickness of the arm 6 is equal to the width of the flat-bottomed notch 10, the spacing between the upper notch surface 8 and the lower notch surface 9 is equal to the spacing between the flat bottoms of the two flat-bottomed notches 10, and the depth of the U-shaped limiting notch 7 is greater than the diameter of the pin 3; the traditional anti-rotation groove integrally arranged on the lifting arm is replaced with a detachable limiting plate 4, and when the limiting plate 4 is seriously worn, a new limiting plate 4 can be replaced at any time to continue to ensure the accuracy of the limit, and the limiting plate 4 is detachably installed on the outer mounting ear 2 of the lifting arm through the fixed end, and the upper support arm 5 and the lower support arm 6 extend into the two flat-bottomed notches 10 of the pin 3 to clamp the pin 3 to prevent the pin 3 from rotating, and because the thickness of the upper support arm 5 and the lower support arm 6 is consistent with the width of the flat-bottomed notch 10, the displacement of the pin 3 is also prevented from the axial direction, playing a double limiting role. The utility model is easy to maintain, ensures the accuracy of the limit, prolongs the service life of the lifting arm, saves production costs, and is conducive to the stable operation of the equipment.

[0023] like Figures 1 to 5 As shown in common, a through hole is provided at the fixed end, and a threaded blind hole corresponding to the through hole is provided on the outer side surface of the outer mounting ear 2. The screw 11 passes through the through hole from the outer side surface of the outer mounting ear 2 and is threadedly installed in the threaded blind hole, so that the limit plate 4 is detachably installed on the outer mounting ear 2. A protective gasket 12 is installed between the screw head of the screw 11 and the limit plate 4. The screw 11 is a relatively common detachable installation method, which is not only convenient for disassembly and assembly but also firmly fixed. The protective gasket 12 can protect the limit plate 4 during the installation of the screw 11, further extending the service life of the limit plate. The screw 11 is located in the threaded blind hole and does not extend out of the inner side surface of the outer mounting ear 2, so that it will not interfere with other components during use.

[0024] like Figure 5 As shown, the fixed end of the limit plate 4 is provided with a large arc surface 16, and the ends of the upper arm 5 and the lower arm 6 are respectively provided with small arc surfaces 17. The large arc surface 16 and the small arc surface 17 are provided to save materials and to avoid sharp edges and corners that may injure operators.

[0025] Embodiment 2:

[0026] This embodiment is basically the same as the first embodiment, except that: Figure 6 and Figure 7 As shown in common, a through hole is provided at the fixed end, a countersunk through hole corresponding to the through hole is provided on the inner side of the outer mounting ear 2, a bolt 13 passes through the through hole from the outer side of the outer mounting ear 2 and is fixedly connected with a fastening nut 14 located in the countersunk through hole, and the limit plate 4 is detachably installed on the outer mounting ear 2, and a locking nut 15 is also threadedly installed on the outer side of the fastening nut 14 in the countersunk through hole, and the outer surface of the locking nut 15 and the outer end surface of the screw of the bolt 13 are both recessed in the inner side of the outer mounting ear 2. Different from the first embodiment, the bolt 13 is used to replace the screw 11, and the countersunk through hole is used to replace the threaded blind hole, and the fastening nut 14 and the bolt 13 cooperate to fix the limit plate 4 so that it is close to the outer side of the outer mounting ear 2, and the locking nut 15 further limits the locking nut 14, doubly ensuring the fastening of the bolt 13, and the locking nut 14 and the locking nut 15 are both located in the countersunk through hole and do not protrude from the outer surface of the outer mounting ear 2, so that they will not interfere with other components during use.

[0027] An elastic gasket is installed between the bolt head of the bolt 13 and the limit plate 4. The elastic gasket further enhances the strength of the fastening. The elastic gasket can be a spring washer, and the elastic gasket has an anti-loosening function, and relies on its own elasticity to play an anti-loosening and anti-vibration effect after installation.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. The lifting arm pin double limit device is characterized by: The invention comprises a pin shaft (3) installed between an inner mounting ear (1) and an outer mounting ear (2) of a lifting arm, the two ends of the pin shaft (3) respectively extending from the inner mounting ear (1) and the outer mounting ear (2), the outer side surface of the outer mounting ear (2) is detachably mounted with a limit plate (4) fitted therewith, the limit plate (4) comprising an integrally arranged fixed end and a limit end, the fixed end being detachably mounted on the outer mounting ear (2), the limit end comprising an upper support arm (5) and a lower support arm (6) arranged opposite to each other in an upper and lower direction, a U-shaped limit groove (7) being formed between the upper support arm (5) and the lower support arm (6), the upper support arm (5) and the lower support arm (6) being arranged opposite to each other in an upper and lower direction, The upper notch surface (8) of the arm (5) and the lower notch surface (9) of the lower arm (6) are arranged in parallel, and the pin shaft (3) is provided with two flat-bottomed notches (10) for use with the upper notch surface (8) and the lower notch surface (9), and the two flat-bottomed notches (10) are arranged at an interval of 180 degrees, the thickness of the upper arm (5) and the lower arm (6) is equal to the width of the flat-bottomed notches (10), the spacing between the upper notch surface (8) and the lower notch surface (9) is equal to the spacing between the flat bottoms of the two flat-bottomed notches (10), and the depth of the U-shaped limiting notch (7) is greater than the diameter of the pin shaft (3).

2. The lifting arm pin dual limit device according to claim 1, characterized in that: The fixed end is provided with a through hole, and the outer surface of the outer mounting ear (2) is provided with a threaded blind hole corresponding to the through hole. The screw (11) passes through the through hole from the outer side surface of the outer mounting ear (2) and is threadedly installed in the threaded blind hole, so that the limit plate (4) is detachably installed on the outer mounting ear (2).

3. The lifting arm pin dual limit device according to claim 2, characterized in that: A protective gasket (12) is installed between the screw head of the screw (11) and the limiting plate (4).

4. The lifting arm pin dual limit device according to claim 1, characterized in that: The fixed end is provided with a through hole, and the inner side surface of the outer mounting ear (2) is provided with a countersunk through hole corresponding to the through hole. The bolt (13) passes through the through hole from the outer side surface of the outer mounting ear (2) and is fixedly connected with the fastening nut (14) located in the countersunk through hole. The limit plate (4) is detachably mounted on the outer mounting ear (2). A locking nut (15) is also threadedly mounted on the outer side of the fastening nut (14) in the countersunk through hole. The outer surface of the locking nut (15) and the outer end surface of the screw of the bolt (13) are both recessed in the inner side surface of the outer mounting ear (2).

5. The lifting arm pin dual limit device according to claim 4, characterized in that: An elastic gasket is installed between the bolt head of the bolt (13) and the limiting plate (4).

6. The lifting arm pin dual limit device according to any one of claims 1 to 5, characterized in that: The fixed end of the limiting plate (4) is provided with a large arc surface (16), and the ends of the upper support arm (5) and the lower support arm (6) are respectively provided with small arc surfaces (17).

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