A grab car frame welding tool

Abstract

The utility model relates to engineering machinery frock technical field, the utility model provides a kind of grab crane upper frame welding frock, including first sleeve, second sleeve and fixed axle, first sleeve and second sleeve are respectively matched with the connecting hole of adjacent ear plate upper opening, and first sleeve and second sleeve are all clamped in the inside of adjacent ear plate, second sleeve is threadedly connected with adjusting bolt, fixed axle one end and first sleeve abut, fixed axle other end and adjusting bolt abut, by first sleeve, fixed axle and the adjusting bolt in second sleeve, form axial support, offset displacement tendency generated by weld heat shrinkage, and by rotating adjusting bolt, change the relative position of adjusting bolt and second sleeve, adjust the spacing of first sleeve and second sleeve in combination with fixed axle, adapt to the installation demand of different specifications hydraulic cylinder, improve the adaptability of frock.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery tooling technology, and more specifically, to a welding tooling for the upper frame of a material handling machine. Background Technology

[0002] As a crucial piece of engineering machinery, the structural precision and welding quality of the superframe of a material handling machine directly affect its overall performance, reliability, and service life. The superframe typically consists of a main support frame, whose front end is connected to the boom via a hinge shaft and driven by a hydraulic cylinder to achieve the boom's luffing motion; the rear of the support frame carries the cab, etc.; and the lower part of the support frame is connected to the lower frame via a slewing mechanism, enabling the machine's slewing function. During the manufacturing process of the superframe, to ensure welding precision, each component is accurately positioned and assembled, pre-welded together with reinforcing ribs. For example, at the front end of the main support frame are multiple pairs of lugs used to install the hinge shaft connecting to the boom. The spacing between each pair of lugs requires high precision, directly determining whether the hinge shaft can be smoothly installed and the operational stability of the boom luffing mechanism.

[0003] However, traditional welding methods rely on manual measurement or simple tooling for distance calibration when positioning ear plates. On the one hand, it is difficult to effectively control the displacement or spacing deviation of ear plates caused by thermal deformation during the welding process, which affects the overall dimensional accuracy of the upper frame. On the other hand, rigid distance is difficult to adapt to the welding requirements of different ear plate spacings. Utility Model Content

[0004] The purpose of this utility model is to provide a welding fixture for the upper frame of a material handling machine, which solves the problems of large deviation in welding spacing of traditional ear plates, insufficient precision, and difficulty in adapting rigid spacing to welding requirements of different ear plate spacings.

[0005] This utility model is achieved through the following technical solution: a welding fixture for the upper frame of a material handling machine, used for positioning and welding paired ear plates on the upper frame. The welding fixture includes a first ferrule, a second ferrule, and a fixed shaft. The first ferrule and the second ferrule respectively cooperate with the connecting holes opened on the adjacent ear plates, and both the first ferrule and the second ferrule are engaged on the inner side of the adjacent ear plates. The second ferrule is threaded with an adjusting bolt. One end of the fixed shaft abuts against the first ferrule, and the other end of the fixed shaft abuts against the adjusting bolt.

[0006] Furthermore, a first limiting groove is provided on the end face of the first ferrule for coaxial engagement with the fixed shaft.

[0007] Furthermore, a second limiting groove is provided on the fixed shaft end face for coaxially engaging and abutting the adjusting bolt.

[0008] Furthermore, the second ferrule has an adjustment cavity for accommodating the fixed shaft.

[0009] Furthermore, the end face of the adjusting bolt that contacts the fixed axis is a spherical head.

[0010] Furthermore, the end faces of the first and second ferrules that contact the ear plate are provided with radially protruding positioning ring platforms.

[0011] Furthermore, the fixed axis is provided with scale lines along the axial direction.

[0012] This utility model has at least the following advantages and beneficial effects: axial support is formed by adjusting bolts in the first ferrule, the fixed shaft, and the second ferrule, which counteracts the displacement tendency caused by the thermal shrinkage of the weld. By rotating the adjusting bolt, the relative position of the adjusting bolt and the second ferrule is changed. Combined with adjusting the distance between the first ferrule and the second ferrule by the fixed shaft, it can adapt to the installation requirements of hydraulic cylinders of different specifications and improve the adaptability of the tooling. Attached Figure Description

[0013] Figure 1 This utility model provides an installation diagram of a welding fixture for the upper frame of a material handling machine.

[0014] Figure 2 This utility model Figure 1 A magnified view of a portion of point A in the middle.

[0015] Reference numerals: 1-First ferrule, 11-Positioning ring platform, 2-Second ferrule, 20-Adjusting cavity, 21-Adjusting bolt, 3-Fixed shaft, 4-Upper frame, 5-Ear plate, 50-Connecting hole. Detailed Implementation

[0016] The specific implementation method is described below with reference to the accompanying drawings.

[0017] Example

[0018] like Figure 1 and Figure 2As shown in this embodiment, a welding fixture for the upper frame of a material handling machine is disclosed, used for positioning and welding paired ear plates 5 on the upper frame 4. The welding fixture includes a first retaining sleeve 1, a second retaining sleeve 2, and a fixed shaft 3. The first retaining sleeve 1 and the second retaining sleeve 2 respectively engage with connecting holes 50 on adjacent ear plates 5, and both the first retaining sleeve 1 and the second retaining sleeve 2 are engaged on the inner side of adjacent ear plates 5. An adjusting bolt 21 is threaded onto the second retaining sleeve 2. One end of the fixed shaft 3 abuts against the first retaining sleeve 1, and the other end of the fixed shaft 3 abuts against the adjusting bolt 21. Specifically, by engaging the first retaining sleeve 1 and the second retaining sleeve 2 with the connecting holes 50 of the ear plates 5, the inner side positioning of adjacent ear plates 5 is achieved, ensuring the relative positional accuracy of the ear plates 5 during welding. When welding reinforcing ribs to adjacent ear plates 5, first adjust the distance between the first retaining sleeve 1 and the second retaining sleeve 2. In the initial position, the end of the adjusting bolt 21 is flush with the inner end face of the second retaining sleeve 2 and tightly abuts against the fixed shaft 3. At this time, the distance between the first retaining sleeve 1 and the second retaining sleeve 2 can be considered as the maximum adjustable distance between adjacent ear plates 5. By unscrewing the adjusting bolt 21, the abutting fixed shaft 3 is retracted into the second retaining sleeve 2, and the distance between the ear plates 5 can be continuously reduced based on the maximum value. The adjustment range is less than the range of retraction of the adjusting bolt 21. It should be noted that, in special cases, the further outward extension of the adjusting bolt 21 can also be used as the adjustable range. In this case, the tooling can still provide rigid support, but the excess extension needs to be measured and confirmed with an external measuring tool. After determining the spacing, i.e., the relative position of the adjusting bolt 21 and the second ferrule 2, insert the first ferrule 1 into the connecting hole 50 of one ear plate 5, and insert the second ferrule 2 into the connecting hole 50 of the other adjacent ear plate 5. After aligning the edges of the ear plates 5, hold the fixed shaft 3 between the first ferrule 1 and the second ferrule 2, and bring the two adjacent ear plates 5 closer together until they are pressed against the fixed shaft 3, forming a rigid support. Maintain the pressing action, and weld the reinforcing ribs to connect the two ear plates 5 into one piece. Then, unscrew the adjusting bolt 21 to release the pressing action on the fixed shaft 3, and remove the fixed shaft 3, the first ferrule 1, and the second ferrule 2. The adjusting bolt 21 in the first ferrule 1, the fixed shaft 3, and the second ferrule 2 forms axial support, counteracting the displacement tendency caused by the thermal shrinkage of the weld. By rotating the adjusting bolt 21, the relative position of the adjusting bolt 21 and the second ferrule 2 is changed. Combined with the adjustment of the fixed shaft 3, the spacing between the first ferrule 1 and the second ferrule 2 is adjusted to adapt to the installation requirements of hydraulic cylinders of different specifications, improving the adaptability of the tooling.

[0019] Furthermore, in specific implementation, a first limiting groove is provided on the end face of the first sleeve 1 provided in this embodiment of the present invention for coaxially engaging with the fixed shaft 3, ensuring that the axis of the fixed shaft 3 is strictly aligned with the axis of the connecting hole 50 of the ear plate 5, and avoiding measurement errors in the ear plate 5 spacing caused by the tilting of the fixed shaft 3. A second limiting groove is provided on the end face of the fixed shaft 3 for coaxially engaging with the adjusting bolt 21, so that the axial thrust of the adjusting bolt 21 is transmitted perpendicularly along the axis of the fixed shaft 3, avoiding bending of the fixed shaft 3 or tilting of the sleeve due to eccentric force. During the welding process, the groove structure of the first limiting groove and the second limiting groove restricts the radial movement of the fixed shaft 3, prevents axial deviation, and ensures the stability of the tooling.

[0020] Furthermore, in a specific implementation, the second sleeve 2 provided in this embodiment of the present invention has an adjustment cavity 20 for accommodating the fixed shaft 3. Specifically, the adjustment cavity 20 provides an axial movement channel for the fixed shaft 3. In the initial state, the end face of the adjusting bolt 21 is flush with the second sleeve 2. By unscrewing the adjusting bolt 21, the fixed shaft 3 is retracted, thereby shortening the distance.

[0021] Furthermore, in a specific implementation, the end face of the adjusting bolt 21 that contacts the fixed shaft 3 in the embodiment of this utility model is a spherical surface. Specifically, the contact between the spherical surface and the fixed shaft 3 is a point contact, and the rolling friction is less than the planar sliding friction, which prevents the end face of the fixed shaft 3 from developing pits or cracks due to long-term stress and extends the service life of the component.

[0022] Furthermore, in a specific implementation, the end faces of the first and second ferrules 1 and ear plates 5 provided in this embodiment of the invention are provided with radially protruding positioning rings 11. The positioning rings 11 enable the first and second ferrules 1 and ear plates 5 to form a stepped engagement, facilitating rapid positioning; at the same time, the positioning rings 11 and ear plates 5 are in surface contact, and the first and second ferrules 1 and second ferrules 2 are in clearance fit with the connecting holes 50, eliminating the risk of tilting of the first and second ferrules 1 and second ferrules 2.

[0023] Furthermore, in a specific implementation, the fixed shaft 3 provided in this embodiment of the present invention is provided with scale lines along the axial direction. Specifically, the distance by which the fixed shaft 3 extends into the second sleeve 2 can be clearly indicated by the scale lines.

Claims

1. A welding fixture for the upper frame of a material handling machine, used for positioning and welding paired ear plates (5) on the upper frame (4), characterized in that, The welding fixture includes a first ferrule (1), a second ferrule (2), and a fixed shaft (3). The first ferrule (1) and the second ferrule (2) respectively cooperate with the connecting holes (50) opened on the adjacent ear plates (5), and the first ferrule (1) and the second ferrule (2) are both snapped into the inner side of the adjacent ear plates (5). The second ferrule (2) is threaded with an adjusting bolt (21). One end of the fixed shaft (3) abuts against the first ferrule (1), and the other end of the fixed shaft (3) abuts against the adjusting bolt (21).

2. The welding fixture for the upper frame of a material handling machine according to claim 1, characterized in that, The first ferrule (1) has a first limiting groove on its end face for coaxial engagement with the fixed shaft (3).

3. The welding fixture for the upper frame of a material handling machine according to claim 2, characterized in that, A second limiting groove is provided on the end face of the fixed shaft (3) for coaxially engaging with the adjusting bolt (21).

4. The welding fixture for the upper frame of a material handling machine according to claim 1, characterized in that, The second ferrule (2) has an adjustment cavity (20) for accommodating the fixed shaft (3).

5. The welding fixture for the upper frame of a material handling machine according to claim 1, characterized in that, The end face of the adjusting bolt (21) that contacts the fixed shaft (3) is a spherical surface.

6. The welding fixture for the upper frame of a material handling machine according to claim 1, characterized in that, The end faces of the first ferrule (1) and the second ferrule (2) that contact the ear plate (5) are provided with radially protruding positioning rings (11).

7. The welding fixture for the upper frame of a material handling machine according to claim 1, characterized in that, The fixed axis (3) is provided with scale lines along the axial direction.

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