Welding structure for hinging point of outer arm of telescopic arm and movable arm fork of excavator

Abstract

The utility model belongs to the technical field of excavators, particularly relates to a welding structure for a hinge point of an outer arm of a telescopic arm and a movable arm fork of an excavator, and aims to solve the problems that the hinge point of the telescopic arm of the existing excavator is single in structure, insufficient in reinforcement, excessively concentrated in welding stress, easy to crack, poor in lubrication of a connecting sleeve of the movable arm fork and the like. Comprising a hinge point connecting structure, the hinge point connecting structure is arranged on the outer wall of a telescopic arm body, and the hinge point connecting structure is hinged to a bucket rod oil cylinder and a movable arm body and used for completing installation, connection and driving of the excavator telescopic arm. According to the hinged point welding structure of the outer arm of the telescopic arm and the movable arm fork of the excavator, through optimal design of the lug base bottom plate and the bent plate, internal stress of a welding seam is effectively dispersed, and breakage of an arm barrel is avoided; the overall strength and stability are remarkably improved through the arrangement of the reinforcing plates; the copper bush is embedded in the movable arm fork connecting sleeve, and the forced filling oil cup is arranged on the outer wall of the movable arm fork connecting sleeve, so that lubricating oil is conveniently injected, and the service life of the structure is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to excavator technical field especially relates to a kind of welding structure for excavator telescopic arm outer arm and movable arm fork hinge point. BACKGROUND

[0002] In the working process of excavator, the hinge point of telescopic arm outer arm and movable arm fork bears huge stress and moment, and the reliability of its structure design and connection mode is directly related to the overall performance and safety of excavator.

[0003] But the hinge point welding structure in prior art still has the following problems when in use:

[0004] 1, the hinge point structure of most existing excavator telescopic arm is welded by ear seat main plate and reinforcing plate, and its structure is single, and the stress position is not well reinforced;

[0005] 2, the internal stress generated by the unreasonable hinge point welding structure cannot be dispersed to both sides of telescopic arm barrel, thereby easily leading to welding stress concentration of telescopic arm barrel welding inner end face, and further causing telescopic arm barrel fracture;

[0006] 3, the welding end face cracking caused by the deficiency of existing welding structure and welding process will further shorten the service period of telescopic arm, and in serious cases, it may cause safety accidents in construction process;

[0007] 4, the existing movable arm fork connecting sleeve is difficult to supplement lubricating oil inside when in use, and the lubricating oil cannot uniformly and effectively wrap movable arm fork pin shaft, thereby reducing the service life of movable arm fork pin shaft.

[0008] In view of the above problems, the utility model file proposes a kind of welding structure for excavator telescopic arm outer arm and movable arm fork hinge point. INVENTION CONTENTS

[0009] The utility model aims at solving the single hinge point structure of existing excavator telescopic arm, insufficient reinforcement, too concentrated welding stress, easy cracking, poor lubrication of movable arm fork connecting sleeve and other shortcomings in prior art, and proposes a kind of welding structure for excavator telescopic arm outer arm and movable arm fork hinge point.

[0010] In order to achieve the above object, the utility model adopts the following technical scheme:

[0011] A kind of welding structure for excavator telescopic arm outer arm and movable arm fork hinge point, comprising:

[0012] The hinge point connecting structure is arranged on the outer wall of the telescopic arm body, is hingedly connected with the bucket rod oil cylinder and the boom body, and is used for completing the mounting connection and driving of the telescopic arm of the excavator.

[0013] The hinge point connecting structure comprises ear seat bottom plate one and ear seat bottom plate two, which are integrally formed and are both welded and mounted on the top of the telescopic arm body arm cylinder.

[0014] In a possible design, one end of the ear seat bottom plate one and the ear seat bottom plate two is provided with a V-shaped groove, which is used for avoiding the welding stress concentration caused by the welding of the telescopic arm body arm cylinder transverse end face, and further causing the arm cylinder to be broken.

[0015] In a possible design, the two ear seat bending plates are both subjected to bending treatment, the bottoms of the two ear seat bending plates respectively extend to the two sides of the telescopic arm body arm cylinder, and the bottoms of the two ear seat bending plates are respectively fixedly connected with the two sides of the telescopic arm body arm cylinder through welding, which is used for dispersing the force acting on the ear seat bending plate to the side surface of the telescopic arm body arm cylinder, thereby avoiding the concentration of the force and the welding stress, and further causing the end face of the telescopic arm body arm cylinder to be broken in the working process.

[0016] In a possible design, the two ear seat bending plates are provided with a reinforcing plate one, a reinforcing plate two, a reinforcing plate three and a reinforcing plate four, which are all located above the ear seat bottom plate two, and are all fixedly connected with one side of the two ear seat bending plates.

[0017] In a possible design, the two sides of the bucket rod cylinder ear seat are both welded with a bucket rod cylinder ear seat gasket, which is used for increasing the stress area of the bucket rod oil cylinder piston rod hinged pin shaft, so as to ensure that the hinged pin shaft will not be deformed when subjected to the force of the bucket rod oil cylinder.

[0018] In a possible design, the two side inner walls of the arm cylinder ear seat are welded with reinforcing plates five, for further strengthening the stability of the hinge point connecting structure.

[0019] In a possible design, one side of the arm cylinder ear seat is welded with a pin shaft limiting block, for preventing the pin shaft from rotating and avoiding the abrasion of the pin shaft to the inner hole of the arm cylinder ear seat and the arm cylinder ear seat gasket, thereby reducing the matching precision.

[0020] In a possible design, the inner wall of the boom fork connecting sleeve is fixedly embedded with a copper bushing, and the outer wall of the boom fork connecting sleeve is provided with a pressure injection oil cup, for pressure injecting lubricating oil into the boom fork connecting sleeve, thereby reducing the friction coefficient of the boom fork pin shaft and the copper bushing and improving the service life of the two.

[0021] In use, the user can connect one end of the boom main body with the boom fork connecting sleeve through the boom fork pin shaft, at this time, the boom main body can complete the lifting of the telescopic arm main body through the welding structure, then the user can complete the hinge connection of one end of the arm cylinder piston rod with the arm cylinder ear seat through another pin shaft, and then the excavator can complete the installation and use of the telescopic arm main body; when working, the user can also pressure inject lubricating oil into the boom fork connecting sleeve through the pressure injection oil cup arranged on the welding structure, which can reduce the friction coefficient of the boom fork pin shaft and the copper bushing inside the boom fork connecting sleeve and improve the service life of the two; the special structural design of the ear seat bottom plate one and the ear seat bottom plate two ensures that the welding structure has high strength in welding connection with the telescopic arm main body, and the bending design and bottom extension design of the two ear seat bending plates further improve the strength of the welding structure and effectively complete the dispersion of the acting force, avoiding the damage of the telescopic arm main body arm cylinder; at the same time, the setting of the reinforcing plates one, two, three, four and five can further strengthen the strength of the welding structure and effectively prolong the service life of the welding structure.

[0022] Beneficial effects: in the welding structure for the hinge point of the outer arm of the telescopic arm of the excavator and the boom fork, the ear seat bottom plate one and the ear seat bottom plate two are integrally formed and welded and installed on the top of the telescopic arm main body arm cylinder, effectively dispersing the internal stress of the weld and avoiding the arm cylinder breakage phenomenon caused by the concentration of the weld; in addition, the ear seat bottom plate one and the ear seat bottom plate one are provided with V-shaped grooves at one end, further reducing the concentration degree of the internal stress of the weld and improving the reliability of the structure.

[0023] The utility model discloses a welding structure for excavator telescopic arm outer arm and movable arm fork hinge point, through setting up two ear seat bending plate of bending treatment, and its bottom is fixed with the both sides welding of telescopic arm main body arm cylinder barrel respectively, effectively dispersed the force that ear seat bending plate received, avoided the arm cylinder barrel end face rupture that the concentrated stress of action force and weld caused, the multiple arc -shaped recesses of ear seat bending plate bottom establishment increased the welding seam area, simultaneously adopted the process of sectional type welding, effectively improved the welding strength,

[0024] The utility model discloses a welding structure for excavator telescopic arm outer arm and movable arm fork hinge point, through setting up the reinforcing plate no. 1, reinforcing plate no. 2, reinforcing plate no. 3 and reinforcing plate no. 4 between two ear seat bending plate, these reinforcing plates and ear seat bending plate and movable arm fork connecting sleeve welding fixed, significantly improved the overall strength and stability of hinge point connecting structure,

[0025] The utility model discloses a welding structure for excavator telescopic arm outer arm and movable arm fork hinge point, the boom cylinder ear seat pad piece of boom cylinder ear seat two sides inner wall welding increases the stress area of pin shaft, prevents the deformation of pin shaft when being affected by boom oil cylinder force, simultaneously, the reinforcing plate no. 5 of boom cylinder ear seat inner welding also further enhanced the stability of hinge point connecting structure,

[0026] The utility model discloses a welding structure for excavator telescopic arm outer arm and movable arm fork hinge point, the pin shaft limiting block of boom cylinder ear seat one side welding effectively prevents the rotation of pin shaft, avoids the abrasion of pin shaft to boom cylinder ear seat and boom cylinder ear seat pad piece inner hole, thereby guaranteeing the cooperation accuracy and service life of both,

[0027] The utility model discloses a welding structure for excavator telescopic arm outer arm and movable arm fork hinge point, the copper bushing of movable arm fork connecting sleeve inner wall inlaying and the pressure injection oil cup of outer wall setting up reduce the friction coefficient of movable arm fork pin shaft and copper bushing, improve the service life of both, and simultaneously, the filling of lubricating oil is facilitated, and the maintenance cost is reduced,

[0028] The utility model discloses a welding structure for excavator telescopic arm outer arm and movable arm fork hinge point, through the optimization design of ear seat bottom plate and bending plate, effectively disperses weld internal stress, avoids arm cylinder barrel rupture, the setting of reinforcing plate significantly promotes overall strength and stability, boom cylinder ear seat pad piece and reinforcing plate no. 5 enhance the stress capacity of pin shaft, and pin shaft limiting block prevents the rotation of pin shaft, ensures cooperation accuracy, movable arm fork connecting sleeve inlaying copper bushing, and its outer wall is equipped with pressure injection oil cup, and the pressure injection of lubricating oil is convenient, can prolong the service life of structure, reduces maintenance cost, and the overall structure is reliable, and the performance is superior. ACCURACY OF DRAWINGS

[0029] Figure 1The utility model provides a kind of overall installation structure schematic diagram for the welding structure of excavator telescopic arm outer arm and movable arm fork hinge joint point;

[0030] Figure 2 The utility model provides a kind of hinge joint structure schematic diagram for the welding structure of excavator telescopic arm outer arm and movable arm fork hinge joint point;

[0031] Figure 3 The utility model provides a kind of overhead structure schematic diagram for the hinge joint structure of excavator telescopic arm outer arm and movable arm fork hinge joint point welding structure;

[0032] Figure 4 The utility model provides a kind of pressure injection oil cup structure schematic diagram for the welding structure of excavator telescopic arm outer arm and movable arm fork hinge joint point;

[0033] Figure 5 It is the schematic diagram of corresponding welding structure in the prior art.

[0034] In the drawing: 1, ear seat bending plate;2, reinforcing plate one;3, reinforcing plate two;4, reinforcing plate three;5, reinforcing plate four;6, reinforcing plate five;7, arm cylinder ear seat;8, pin shaft limiting block;9, ear seat bottom plate one;10, ear seat bottom plate two;11, movable arm fork connecting sleeve;12, arm cylinder ear seat gasket;13, copper bushing;14, pressure injection oil cup;15, movable arm main body;16, movable arm oil cylinder;17, arm oil cylinder;18, telescopic arm main body;19, hinge joint structure;101, existing ear seat main plate;102, existing reinforcing plate one;103, existing reinforcing plate two;104, existing reinforcing plate three;105, existing arm cylinder ear sleeve;106, existing movable arm fork connecting sleeve;107, existing ear seat bottom plate. DETAILED DESCRIPTION

[0035] Firstly, refer to Figure 5 It is the schematic diagram of welding structure in the prior art, wherein, prior art structure is single, which is welded by two existing ear seat main plates 101, existing reinforcing plate one 102, existing reinforcing plate two 103, existing reinforcing plate three 104, two existing arm cylinder ear sleeves 105, existing movable arm fork connecting sleeve 106 and existing ear seat bottom plate 107.

[0036] Two existing ear seat main plates 101 are welded on the top of existing ear seat bottom plate 107, existing ear seat bottom plate 107 is welded on the outer wall of telescopic arm, two existing arm cylinder ear sleeves 105 are welded on the side of two existing ear seat main plates 101 close to each other respectively, and existing movable arm fork connecting sleeve 106 is welded between two existing ear seat main plates 101.

[0037] Meanwhile, the existing reinforcing plate 1 102, the existing reinforcing plate 2 103 and the existing reinforcing plate 3 104 are all welded between the two existing ear seat main plates 101 and are all welded with the existing boom connector sleeve 106.

[0038] Moreover, the welding process of the prior art requires that the welding position must ensure a full welding line, but because of the full welding seam, a large internal stress is generated in the welding structure, which is easy to cause damage to the structure.

[0039] In view of the improvement of the welding structure in the prior art, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0040] Embodiment 1: Refer to Figures 1-4 A welding structure, comprising: a hinge point connecting structure 19 for realizing the mounting connection and driving of the telescopic arm of the excavator.

[0041] In this embodiment, the hinge point connecting structure 19 is arranged on the outer wall of the telescopic arm body 18 and is hingedly connected with the arm cylinder 17 and the boom body 15. The hinge point connecting structure 19 specifically comprises an ear seat bottom plate 1 and an ear seat bottom plate 2, which are integrally formed and are both welded on the top of the arm cylinder of the telescopic arm body 18.

[0042] Further, in this embodiment, two ear seat bending plates 1 are welded on both sides of the ear seat bottom plate 2, and the same boom connector sleeve 11 penetrates between the two ear seat bending plates 1. The boom connector sleeve 11 is located above the ear seat bottom plate 2 and is welded with the two ear seat bending plates 1. The boom connector sleeve 11 is hingedly connected with one end of the boom body 15 through a boom fork pin shaft.

[0043] Further, in this embodiment, a boom cylinder ear seat 7 is welded on the top of the ear seat bottom plate 1, and the boom cylinder ear seat 7 is hingedly connected with one end of the piston rod of the boom cylinder 17 through a pin shaft.

[0044] In order to optimize the welding structure and avoid the arm cylinder fracture caused by the welding seam stress concentration, in this embodiment, one end of the ear seat bottom plate 1 and the ear seat bottom plate 2 is designed with a V-shaped groove. At the same time, the top of the two is provided with a round hole, and the inner wall of the round hole is fixed by welding with the joint of the arm cylinder of the telescopic arm body 18, which further strengthens the stability of the structure.

[0045] In this embodiment, the ear seat bending plate 1 is subjected to bending treatment, and the bottom thereof extends to the two sides of the arm cylinder of the telescopic arm body 18 and is fixedly connected to the two sides of the arm cylinder of the telescopic arm body 18 by welding. Such a design can disperse the force acting on the ear seat bending plate 1 to the side surface of the arm cylinder of the telescopic arm body 18, avoid the concentration of the force and the internal stress of the welding seam, and thus prevent the fracture of the end surface of the arm cylinder. In addition, the bottom of the ear seat bending plate 1 is also provided with a plurality of arc-shaped grooves to increase the welding seam area of the ear seat bending plate 1 and the side surface of the arm cylinder of the telescopic arm body 18.

[0046] In this embodiment, the welding process of the welding structure requires that the welding seam between the ear seat bending plate 1 and the side surface of the arm cylinder of the telescopic arm be segmented, so as to avoid the deformation of the arm cylinder of the telescopic arm caused by the internal stress of the welding seam.

[0047] The present application can be used in the technical field of excavators, and can also be used in other fields applicable to the present application.

[0048] Embodiment 2: Reference Figure 2 、 3 , 4, improvement based on embodiment 1: a welding structure for the hinge point between the outer arm of the telescopic arm of the excavator and the movable arm fork, which is applied to the technical field of excavators;

[0049] In this embodiment, the reinforcing plate one 2, the reinforcing plate two 3, the reinforcing plate three 4 and the reinforcing plate four 5 are arranged between the two ear seat bending plates 1, and the reinforcing plates are located above the ear seat bottom plate two 10 and are fixedly welded to one side of the two ear seat bending plates 1. The reinforcing plate one 2, the reinforcing plate three 4 and the reinforcing plate four 5 are also fixedly welded to the outer wall of the movable arm fork connecting sleeve 11, further enhancing the strength and stability of the structure.

[0050] In this embodiment, the two side inner walls of the bucket rod cylinder ear seat 7 are welded with the bucket rod cylinder ear seat gasket 12, which is used to increase the stress area of the piston rod hinge pin shaft of the bucket rod cylinder 17, so as to prevent the deformation of the piston rod hinge pin shaft when it is subjected to the force of the bucket rod cylinder 17. In addition, the two side inner walls of the bucket rod cylinder ear seat 7 are also welded with the reinforcing plate five 6, further enhancing the stability of the hinge point connecting structure 19.

[0051] In order to prevent the pin shaft from rotating, the side of the bucket rod cylinder ear seat 7 is also welded with the pin shaft limiting block 8 in this embodiment, which can avoid the wear of the inner hole of the bucket rod cylinder ear seat 7 and the bucket rod cylinder ear seat gasket 12 by the pin shaft, and maintain the matching precision.

[0052] In this embodiment, the copper bushing 13 is fixedly embedded in the inner wall of the movable arm fork connecting sleeve 11 to reduce the friction coefficient between the movable arm fork pin shaft and the copper bushing 13. At the same time, the outer wall of the movable arm fork connecting sleeve 11 is provided with a pressure injection oil cup 14 for pressure injection of lubricating oil into the movable arm fork connecting sleeve 11, further improving the service life of the two.

[0053] The working principle and use process of the technical solution are as follows:

[0054] In use, the user can hinge one end of the movable arm body 15 with the movable arm fork connecting sleeve 11 through the movable arm fork pin shaft, at this time the movable arm body 15 can complete the lifting of the telescopic arm body 18 through the welding structure, then the hinge of the piston rod one end of the dipper rod oil cylinder 17 with the dipper rod cylinder ear seat 7 can be completed through another pin shaft, then the excavator can complete the installation and use of the telescopic arm body 18; the welding structure can also inject lubricating oil into the movable arm fork connecting sleeve 11 through the injection oil cup 14 arranged thereon when working, which can reduce the friction coefficient of the movable arm fork pin shaft and the copper bush 13 inside the movable arm fork connecting sleeve 11, and can improve the service life of the two; the welding structure is designed with the special structure of the ear seat bottom plate one 9 and the ear seat bottom plate two 10, which ensures that the welding connection strength with the telescopic arm body 18 is high, and the bending design and bottom extension design of the two ear seat bending plates 1 further improve the strength of the welding structure, effectively complete the dispersion of the force, and avoid the damage of the telescopic arm body 18 arm barrel; at the same time, the setting of the reinforcing plate one 2, the reinforcing plate two 3, the reinforcing plate three 4, the reinforcing plate four 5 and the reinforcing plate five 6 can further strengthen the strength of the welding structure, effectively prolong the service life of the welding structure.

[0055] The above is only the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A welding structure for the hinge joint between the outer boom and the boom fork of an excavator telescopic boom, characterized in that, include: Hinge connection structure (19), the hinge connection structure (19) is set on the outer wall of the telescopic boom body (18), the hinge connection structure (19) is hinged to the stick cylinder (17) and the boom body (15), and is used to complete the installation, connection and drive of the excavator telescopic boom; The hinge connection structure (19) includes a lug base plate one (9) and a lug base plate two (10). The lug base plate one (9) and the lug base plate two (10) are integrally formed. The lug base plate one (9) and the lug base plate two (10) are both welded and installed on the top of the boom cylinder of the telescopic boom body (18). Two lug bending plates (1) are welded and installed on both sides of the lug base plate two (10). The same boom fork is connected between the two lug bending plates (1). The boom fork connecting sleeve (11) is located above the lug base plate two (10). The boom fork connecting sleeve (11) is welded and fixed to the two lug bending plates (1). The boom fork connecting sleeve (11) is hinged to one end of the boom body (15) through the boom fork pin. The top of the lug base plate one (9) is welded with the stick cylinder lug seat (7). The stick cylinder lug seat (7) is hinged to one end of the piston rod of the stick cylinder (17) through the pin.

2. The welding structure for the hinge joint between the outer boom and the boom fork of an excavator telescopic boom according to claim 1, characterized in that, Both the first (9) and the second (10) of the ear base plate are provided with V-shaped grooves at one end to avoid stress concentration in the weld caused by the weld seam being concentrated on the horizontal end face of the telescopic arm body (18), which could lead to the breakage of the arm body. Both the first (9) and the second (10) of the ear base plate are provided with round holes at the top. The inner wall of the round hole is fixed to the joint of the telescopic arm body (18) with the arm body by welding to further enhance the stability of the structure.

3. The welding structure for the hinge joint between the outer boom and the boom fork of an excavator telescopic boom according to claim 1, characterized in that, Both of the aforementioned ear-mount bending plates (1) have been bent. The bottom of the two ear-mount bending plates (1) extends to both sides of the telescopic arm body (18) and the bottom of the two ear-mount bending plates (1) is fixedly connected to both sides of the telescopic arm body (18) by welding. This is to distribute the force on the ear-mount bending plates (1) to the side of the telescopic arm body (18) and thus avoid the breakage of the end face of the telescopic arm body (18) during operation due to the concentration of force and internal stress in the weld. The bottom of the two ear-mount bending plates (1) is provided with multiple arc-shaped grooves to increase the weld area between the ear-mount bending plates (1) and the side of the telescopic arm body (18).

4. A welding structure for the hinge joint between the outer boom and the boom fork of an excavator telescopic boom according to claim 1, characterized in that, A first reinforcing plate (2), a second reinforcing plate (3), a third reinforcing plate (4), and a fourth reinforcing plate (5) are provided between the two ear-mount bending plates (1), and they are all located above the ear-mount bottom plate 2 (10). The first reinforcing plate (2), the second reinforcing plate (3), the third reinforcing plate (4), and the fourth reinforcing plate (5) are all welded and fixed to one side of the two ear-mount bending plates (1). One side of the first reinforcing plate (2), the third reinforcing plate (4), and the fourth reinforcing plate (5) are all welded and fixed to the outer wall of the boom fork connecting sleeve (11).

5. A welding structure for the hinge joint between the outer boom and the boom fork of an excavator telescopic boom according to claim 1, characterized in that, Both sides of the inner wall of the boom cylinder lug seat (7) are welded with boom cylinder lug seat gaskets (12) to increase the force-bearing area of ​​the piston rod hinge pin of the boom cylinder (17) so as to ensure that it will not deform when subjected to the force of the boom cylinder (17).

6. A welding structure for the hinge joint between the outer boom and the boom fork of an excavator telescopic boom according to claim 5, characterized in that, The inner walls of the two sides of the boom cylinder lug seat (7) are welded with reinforcing plates (6) to further enhance the stability of the hinge connection structure (19).

7. A welding structure for the hinge joint between the outer boom and the boom fork of an excavator telescopic boom according to claim 6, characterized in that, A pin limit block (8) is welded to one side of the boom cylinder ear seat (7) to prevent the pin from rotating and to avoid the pin from causing wear on the inner hole of the boom cylinder ear seat (7) and the boom cylinder ear seat gasket (12), thereby reducing their fitting accuracy.

8. A welding structure for the hinge joint between the outer boom and the boom fork of an excavator telescopic boom according to claim 1, characterized in that, The inner wall of the boom fork connecting sleeve (11) is fixedly embedded with a copper bushing (13), and the outer wall of the boom fork connecting sleeve (11) is provided with an oil injection cup (14) for injecting lubricating oil into the boom fork connecting sleeve (11), thereby reducing the friction coefficient between the boom fork pin and the copper bushing (13) and improving their service life.

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