Movable arm supporting pin shaft connecting structure

Abstract

The utility model provides a movable arm supporting pin shaft connecting structure, which belongs to the technical field of excavators and comprises a movable arm, two sides of the movable arm are hinged with a movable arm oil cylinder through a pin shaft, two ends of the pin shaft are provided with baffles, the movable arm oil cylinder is arranged between the movable arm and the baffles, and the baffles are fixedly connected with the end face of the pin shaft through bolts. The baffle is fixed to the end face of the pin shaft through the bolt, the bolt can be prevented from being bent, and therefore the baffle can be smoothly detached during overhauling, and the overhauling efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of excavators, and particularly relates to a boom support pin connection structure. Background Art

[0002] The working device of an excavator generally includes a boom, an arm, a bucket, a boom cylinder, an arm cylinder, a bucket cylinder, and a linkage mechanism. Each mechanism is hinged to each other by pins, and the entire working device is then hinged to the excavator slewing platform by pins.

[0003] Among them, the boom cylinder of the excavator is generally hinged to the boom of the excavator at one end by a pin, and hinged to the slewing platform at the other end. Its main function is to support the boom, and the boom is lifted and lowered by the telescopic movement of the boom cylinder.

[0004] In the prior art, the connection between the boom and the boom cylinder is as Figure 2 shown. Generally, a retaining ring with an outer diameter larger than the diameter of the pin is sleeved at one end of the pin. Through holes are opened in the retaining ring and the pin, and the mounting bolt is passed through the through holes in the retaining ring and the pin to limit the end of the pin. However, since the mounting bolt and the pin are perpendicular to each other, the mounting bolt will be bent by collision during use. During maintenance, the retaining ring needs to be removed. Since the mounting bolt is bent, it cannot be withdrawn from the through holes in the retaining ring and the pin, seriously affecting the maintenance efficiency. Summary of the Utility Model

[0005] Aiming at the defects or deficiencies in the prior art, the utility model provides a boom support pin connection structure, which fixes the baffle on the pin end face by bolts, can prevent the bolts from bending, and thus can be smoothly disassembled during maintenance, improving the maintenance efficiency.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] An embodiment of the utility model provides a boom support pin connection structure, including a boom. The two sides of the boom are hinged to a boom cylinder by pins. Baffles are arranged at both ends of the pin. The boom cylinder is located between the boom and the baffle, and the baffle is fixedly connected to the pin end face by bolts.

[0008] Further, the pin is fixed in a shaft hole opened on the boom. The shaft hole is located above the bending part of the boom, and the shaft hole penetrates through both ends of the boom.

[0009] Further, the cross-sectional diameter of the pin is equal to the cross-sectional diameter of the shaft hole.

[0010] Further, hinge parts are arranged at both ends of the pin for hinging with the boom cylinder. The length of the pin is greater than the length of the shaft hole, and the hinge parts at both ends of the pin are located outside the boom.

[0011] Furthermore, the cross-sectional diameter of the hinge portion is the same as the diameter of the hinge hole at the end of the boom cylinder.

[0012] Furthermore, the length of the hinge portion is the same as the length of the hinge hole of the boom cylinder.

[0013] Furthermore, the cross-section of the baffle is circular, and the axis of the baffle coincides with the axis of the pin shaft.

[0014] Furthermore, the diameter of the baffle is larger than the diameter of the hinge hole of the boom cylinder.

[0015] Furthermore, the inner surface of the baffle contacts the end face of the shaft hole of the boom cylinder.

[0016] Furthermore, a plurality of through holes are provided on the outer surface of the baffle, and a plurality of bolt holes are provided on the end faces of both ends of the pin shaft. The plurality of through holes and the plurality of bolt holes are correspondingly arranged.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] By providing baffles at both ends of the pin shaft, the boom cylinder is located between the boom and the baffle, and the baffle is fixed to the end faces of both ends of the pin shaft by bolts, the present utility model can effectively prevent the bolts from bending due to collision with objects such as stones, so that the baffle can be smoothly disassembled during maintenance, improving the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the pin shaft connection structure in the embodiment of the present utility model;

[0020] Figure 2 is a schematic diagram of the connection between the boom and the boom cylinder in the prior art;

[0021] Among them, 1. Boom; 2. Boom cylinder; 3. Baffle; 4. Bolt; 5. Pin shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0023] A typical embodiment of the present utility model is as Figure 1 shown, a boom support pin shaft connection structure includes a boom 1 and a pin shaft 5. A shaft hole is provided on the boom 1. The shaft hole is located above the bending portion of the boom 1 and penetrates through both ends of the boom 1. The cross-sectional diameter of the pin shaft 5 is equal to the cross-sectional diameter of the shaft hole, so that the pin shaft 5 can be inserted into the shaft hole, thereby realizing the connection between the pin shaft 5 and the boom 1 and restricting the radial movement of the pin shaft 5.

[0024] Both ends of the pin shaft 5 are provided with hinge parts for hinging with the boom cylinder 2. The length of the pin shaft 5 is greater than the length of the shaft hole, so that the hinge parts at both ends of the pin shaft 5 are located outside the boom 1. The cross-sectional diameter of the hinge part is the same as the diameter of the hinge hole at the end of the boom cylinder 2, so that the end of the boom cylinder 2 is sleeved outside the hinge part, realizing the hinge between the boom cylinder 2 and the pin shaft 5, and at the same time being able to limit the radial movement of the boom cylinder 2.

[0025] The length of the hinge part is the same as the length of the hinge hole of the boom cylinder 2. Both end faces of the pin shaft 5 are fixedly connected with baffles 3. The cross-section of the baffle 3 is circular, and the axis of the baffle 3 coincides with the axis of the pin shaft 5.

[0026] The diameter of the baffle 3 is greater than the diameter of the hinge hole of the boom cylinder 2. When the baffle 3 is fixed on the end face of the pin shaft 5, the inner surface of the baffle 3 is in contact with the end face of the shaft hole of the boom cylinder 2, so that the end of the boom cylinder 2 is located between the boom 1 and the baffle 3, and the baffle 3 is used to limit the boom cylinder 2 to prevent axial movement of the boom cylinder 2.

[0027] A plurality of through holes are provided on the outer surface of the baffle 3, and a plurality of bolt holes are provided on both end faces of the pin shaft 5. The plurality of through holes and the plurality of bolt holes are arranged correspondingly, and the two baffles 3 are fixed to both ends of the pin shaft 5 by bolts 4.

[0028] In the present utility model, by providing the baffles 3 at both ends of the pin shaft 5, the boom cylinder 2 is located between the boom 1 and the baffle 3, a plurality of through holes are provided on the baffle 3, and a plurality of bolt holes corresponding to the plurality of through holes are provided on both end faces of the pin shaft 5. The baffle 3 is fixed to both end faces of the pin shaft 5 by bolts 4. Since the bolts 4 and the pin shaft 5 are parallel to each other and the bolts 4 do not protrude from the end face of the baffle 3, it is possible to effectively prevent the bolts 4 from colliding with objects such as stones during work and being bent. When it is necessary to disassemble the baffle 3, only the bolts 4 need to be unscrewed from the pin shaft 5 to remove it, avoiding the situation where the baffle 3 cannot be smoothly removed due to the bending of the bolts 4, and improving the maintenance efficiency.

[0029] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A boom support pin connection structure, characterized in that: It comprises a movable arm, both sides of which are hinged to the movable arm cylinder through a pin shaft, baffles are arranged at both ends of the pin shaft, the movable arm cylinder is located between the movable arm and the baffle, and the baffle is fixedly connected to the end face of the pin shaft through bolts.

2. A boom support pin connection structure according to claim 1, characterized in that: The pin shaft is fixed in an axial hole opened on the movable arm. The axial hole is located at the upper part of the bending part of the movable arm, and the axial hole passes through two ends of the movable arm.

3. A boom support pin connection structure as claimed in claim 2, characterized in that: The cross-sectional diameter of the pin is equal to the cross-sectional diameter of the shaft hole.

4. A boom support pin connection structure as claimed in claim 2, characterized in that: Both ends of the pin shaft are provided with hinged parts for hinged connection with the boom cylinder. The length of the pin shaft is greater than the length of the shaft hole. The hinged parts at both ends of the pin shaft are located outside the boom.

5. A boom support pin connection structure as claimed in claim 4, characterized in that: The cross-sectional diameter of the hinged portion is the same as the diameter of the hinged hole at the end of the boom cylinder.

6. A boom support pin connection structure as claimed in claim 4, characterized in that: The length of the hinged portion is the same as the length of the hinged hole of the boom cylinder.

7. The boom support pin connection structure according to claim 1, characterized in that: The cross section of the baffle is circular, and the axis of the baffle coincides with the axis of the pin shaft.

8. The boom support pin connection structure according to claim 1, characterized in that: The diameter of the baffle is larger than the diameter of the hinge hole of the boom oil cylinder.

9. The boom support pin connection structure according to claim 1, characterized in that: The inner surface of the baffle is in contact with the end surface of the boom cylinder shaft hole.

10. The boom support pin connection structure according to claim 1, characterized in that: The outer surface of the baffle is provided with a plurality of through holes, and the end surfaces at both ends of the pin shaft are provided with a plurality of bolt holes, and the plurality of through holes are arranged correspondingly to the plurality of bolt holes.

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