A welding fixture for a cylinder lifting lug

Abstract

The utility model relates to the technical fields of welding tool, especially an oil cylinder lug welding fixture, which comprises a seat body, a positioning groove, an inner vertical frame, an outer vertical frame and a lifting groove are sequentially arranged from inside to outside on the top of the seat body, a cylinder body is built in the positioning groove, a cylinder body fixing mechanism is arranged on the outside of the positioning groove, positioning holes are arranged on the surface of the inner vertical frame and the outer vertical frame at positions corresponding to each other, an arc-shaped positioning part is arranged on the surface of the outer vertical frame, a sliding seat is vertically and slidingly connected to the inner wall of the lifting groove, the sliding seat is driven by a synchronous mechanism inside the seat body, an arc-shaped groove is built in the top of the sliding seat, a coaxial fixing mechanism is arranged on the L-shaped support of the sliding seat. Thus, the utility model realizes high-precision positioning and stable fixing of the cylinder body and the lug sleeve through the positioning groove, the arc-shaped positioning part and the coaxial fixing mechanism, the synchronous mechanism ensures the alignment of the height, the rotating platform is convenient for all-around welding, the controller realizes automatic operation, and the welding quality and efficiency are effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of welding fixtures, and in particular to a welding fixture for hydraulic cylinder lifting lugs. Background Technology

[0002] As a key load-bearing component of the hydraulic cylinder assembly, the welding quality of the cylinder lugs directly determines the assembly accuracy and operational safety of the hydraulic cylinder.

[0003] In existing technologies, the welding and positioning of the hydraulic cylinder lifting lug and the cylinder body mostly rely on manual operation: the relative position of the lifting lug and the cylinder body is manually adjusted, and then temporarily fixed with a pressure block. This operation method has significant drawbacks: the positioning accuracy of the welding part is difficult to guarantee, which can easily lead to deviations in the concentricity of the lifting lug and the cylinder body; the stability of the temporary pressure block fixation is insufficient, and the position can easily shift during the welding process; moreover, the operation process is cumbersome, which seriously affects the welding quality and production efficiency, and urgently needs to be improved. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, the purpose of this utility model is to propose a welding fixture for hydraulic cylinder lifting lugs. This utility model achieves high-precision positioning and stable fixing of the cylinder body and the lifting lug sleeve through positioning grooves, arc-shaped positioning parts, and coaxial fixing mechanisms. The synchronization mechanism ensures height alignment, the rotating platform facilitates all-round welding, and the controller realizes automated operation, effectively improving welding quality and efficiency.

[0006] To achieve the above objectives, this utility model proposes a welding fixture for hydraulic cylinder lifting lugs, comprising:

[0007] The base body has, from the inside out, a positioning groove, an inner vertical frame, an outer vertical frame, and a lifting groove on its top. A cylinder is housed within the positioning groove, and a cylinder fixing mechanism is located on the outside of the positioning groove. Positioning holes are correspondingly provided on the surfaces of the inner and outer vertical frames. An arc-shaped positioning part is provided on the surface of the outer vertical frame. A sliding block is vertically slidably connected to the inner wall of the lifting groove. The sliding block is driven by a synchronization mechanism inside the base body.

[0008] The top of the slide block has an arc-shaped groove housing a lifting lug sleeve. The end of the lifting lug sleeve near the outer vertical frame has an arc-shaped slot that matches the dimensions of the arc-shaped positioning part. The L-shaped bracket of the slide block is equipped with a coaxial fixing mechanism, which includes:

[0009] The third hydraulic telescopic cylinder is fixedly connected to the surface of the L-shaped bracket.

[0010] Limiting disc: It is horizontally slidably connected to the surface of the L-shaped bracket and connected to the output end of the third hydraulic telescopic cylinder;

[0011] Fixed shaft: It is fixedly connected to the surface of the limiting disc and located inside the lifting lug sleeve;

[0012] Pressure sensor: installed on the end face of the fixed shaft;

[0013] Air expansion shaft: evenly distributed on the surface of the fixed shaft.

[0014] In addition, the hydraulic cylinder lifting lug welding fixture proposed in the above application may also have the following additional technical features:

[0015] Specifically, the cylinder fixing mechanism includes a 7-shaped bracket, a first hydraulic telescopic cylinder, and a pressure plate, wherein,

[0016] The 7-shaped bracket is integrally formed and installed on the top of the base body and located outside the positioning groove. The first hydraulic telescopic cylinder is fixedly connected to the top of the 7-shaped bracket. The output end of the first hydraulic telescopic cylinder passes through the bottom of the 7-shaped bracket and is fixedly connected to the pressure plate. The bottom of the pressure plate abuts against the top of the cylinder body.

[0017] Specifically, the positioning groove is adapted to the outer dimensions of the cylinder body, the positioning hole is adapted to the outer dimensions of the lifting lug sleeve, and the arc-shaped positioning part is adapted to the outer dimensions of the cylinder body.

[0018] Specifically, the synchronization mechanism includes a second hydraulic telescopic cylinder, a support plate, and fixing bolts, wherein,

[0019] The seat body has a central cavity inside and a side cavity outside the central cavity, which is connected to the inside of the lifting groove. The second hydraulic telescopic cylinder is fixedly connected to the bottom wall of the central cavity. The bearing plate is fixedly connected to the output end surface of the second hydraulic telescopic cylinder and is vertically slidably connected to the inner wall of the central cavity. Both ends of the bearing plate penetrate into the side cavity and are fixedly connected to the bottom of the slide block by the fixing bolts.

[0020] Limiting blocks and limiting grooves are respectively provided at positions corresponding to the sliding surface and the inner wall of the side cavity. The limiting blocks are vertically slidably connected to the inner wall of the limiting grooves.

[0021] Specifically, a groove is provided on the surface of the fixed shaft near the end of the lifting lug sleeve, and an elastic locking rod is provided on the inner wall of the groove. The pressure sensor is located on the inner wall of the groove and is in contact with the inner end surface of the elastic locking rod.

[0022] Specifically, it also includes a base, on the top of which a controller and a rotating platform are respectively provided. The rotating platform is driven by a hydraulic motor built into the base. The seat body is fixedly connected to the top of the rotating platform. The third hydraulic telescopic cylinder, the first hydraulic telescopic cylinder, the second hydraulic telescopic cylinder, the pressure sensor, the air shaft, and the hydraulic motor are all connected to the controller through wires to realize data transmission and control command reception.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] 1. High positioning accuracy: Through the combination of arc-shaped positioning part, fixed shaft and air expansion shaft, extremely high coaxiality and perpendicularity between the lifting lug sleeve and cylinder body are achieved, fundamentally solving the problem of insufficient manual positioning accuracy;

[0026] 2. Strong stability: The air expansion shaft provides rigid support from the inside, and with the pressure closed-loop control, the fixing effect is stable and reliable, which can effectively resist thermal deformation and vibration during the welding process and avoid welding displacement.

[0027] 3. High degree of automation: The entire positioning, fixing and adjustment process is automatically controlled by the controller, which reduces manual intervention, reduces the difficulty of operation, and improves production efficiency and consistency;

[0028] 4. Convenient and efficient operation: The complex manual alignment and fixing steps are simplified into a series of button operations, which significantly shortens the preparation time of a single product and improves the cycle time of the production line;

[0029] 5. Exquisite structural design: The layout of each mechanism is reasonable. For example, the synchronous mechanism enables simultaneous lifting and lowering on both sides, and the rotating platform facilitates welding from all directions. The overall structure is compact and easy to maintain.

[0030] 6. Good versatility: By replacing some positioning components, this clamp can be adapted to various specifications of hydraulic cylinders and lifting lugs, and has strong versatility and flexibility. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0032] Figure 1 This is an exploded view of the structure of a hydraulic cylinder lifting lug welding fixture according to the present invention;

[0033] Figure 2 This is a schematic diagram of the base structure in a hydraulic cylinder lifting lug welding fixture of the present invention;

[0034] Figure 3 This is a schematic diagram of the cylinder body fixing mechanism in a hydraulic cylinder lifting lug welding fixture of this utility model;

[0035] Figure 4 This is a schematic diagram of the coaxial fixing mechanism in a hydraulic cylinder lifting lug welding fixture of this utility model.

[0036] As shown in the figure:

[0037] 1. Base; 11. Positioning groove; 12. Inner vertical frame; 13. Outer vertical frame; 14. Lifting groove; 15. Positioning hole; 16. Arc-shaped positioning part; 17. Limiting groove;

[0038] 2. Cylinder body; 3. Cylinder body fixing mechanism; 31. L-shaped bracket; 32. First hydraulic telescopic cylinder; 33. Pressure plate;

[0039] 5. Synchronization mechanism; 51. Second hydraulic telescopic cylinder; 52. Bearing plate; 53. Fixing bolt; 100. Central cavity; 200. Side cavity;

[0040] 4. Slide; 41. Arc-shaped groove; 42. L-shaped bracket; 43. Limiting block;

[0041] 6. Lifting lug sleeve; 61. Arc-shaped groove;

[0042] 7. Coaxial fixing mechanism; 71. Third hydraulic telescopic cylinder; 72. Limiting disc; 73. Fixed shaft; 74. Air expansion shaft; 75. Elastic locking rod;

[0043] 8. Base; 81. Controller; 82. Rotating platform. Detailed Implementation

[0044] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Rather, the embodiments of the present invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0045] The following description, in conjunction with the accompanying drawings, describes a welding fixture for a hydraulic cylinder lifting lug according to an embodiment of the present invention.

[0046] like Figures 1-4 As shown, an embodiment of the present invention provides a hydraulic cylinder lifting lug welding fixture, comprising:

[0047] The base 1 has, from the inside out, a positioning groove 11, an inner vertical frame 12, an outer vertical frame 13, and a lifting groove 14. The positioning groove 11 houses a cylinder 2, and a cylinder fixing mechanism 3 is located on the outside of the positioning groove 11. Positioning holes 15 are provided at corresponding positions on the surfaces of the inner vertical frame 12 and the outer vertical frame 13. An arc-shaped positioning part 16 is provided on the surface of the outer vertical frame 13. A slide block 4 is vertically slidably connected to the inner wall of the lifting groove 14. The slide block 4 is driven by a synchronization mechanism 5 inside the base 1.

[0048] The top of the slide block 4 has an arc-shaped groove 41 in which a lifting lug sleeve 6 is built. The surface of the lifting lug sleeve 6 near the outer vertical frame 13 has an arc-shaped slot 61 that matches the outer dimensions of the arc-shaped positioning part 16. The L-shaped bracket 42 of the slide block 4 is provided with a coaxial fixing mechanism 7, which includes:

[0049] The third hydraulic telescopic cylinder 71 is fixedly connected to the surface of the L-shaped bracket 42;

[0050] Limiting disc 72: It is horizontally slidably connected to the surface of L-shaped bracket 42 and connected to the output end of third hydraulic telescopic cylinder 71;

[0051] Fixed shaft 73: It is fixedly connected to the surface of the limiting disc 72 and located inside the lifting lug sleeve 6;

[0052] Pressure sensor: installed on the end face of fixed shaft 73;

[0053] Air expansion shaft 74: evenly distributed on the surface of fixed shaft 73.

[0054] Specifically, this utility model achieves high-precision positioning and stable fixing of the cylinder body 2 and the lifting lug sleeve 6 through the positioning groove 11, the arc-shaped positioning part 16, and the coaxial fixing mechanism 7. The synchronization mechanism 5 ensures height alignment, the rotating platform 82 facilitates all-round welding, and the controller 81 realizes automated operation, effectively improving welding quality and efficiency. Its specific working principle is as follows:

[0055] Positioning and fixing of cylinder 2: Place cylinder 2 in the positioning groove 11 of base 1, start cylinder fixing mechanism 3, drive pressure plate 33 to press down through first hydraulic telescopic cylinder 32, and firmly fix cylinder 2 in positioning groove 11.

[0056] Initial positioning of the lifting lug sleeve 6: Place the lifting lug sleeve 6 in the arc-shaped groove 41 of the slide block 4, adjust the angle of the lifting lug sleeve 6 so that the arc-shaped groove 61 at its end fits into the arc-shaped positioning part 16 on the outer vertical frame 13, and complete the initial radial positioning.

[0057] Coaxial fixing of the lug sleeve 6: The third hydraulic telescopic cylinder 71 in the coaxial fixing mechanism 7 is activated. The cylinder pushes the limiting disc 72 and the fixed shaft 73 to move horizontally, so that the fixed shaft 73 extends into the interior of the lug sleeve 6. When the pressure sensor on the end face of the fixed shaft 73 detects that the contact pressure with the arc-shaped positioning part 16 reaches the set value, the third hydraulic telescopic cylinder 71 stops operating. Subsequently, the air expansion shaft 74 on the fixed shaft 73 is inflated and expanded, and it is tightened from the inside of the lug sleeve 6 to achieve high-precision coaxial fixing.

[0058] Height and Axial Alignment: Activate the second hydraulic telescopic cylinder 51 in the synchronization mechanism 5. This cylinder drives the slide blocks 4 on both sides to rise and fall synchronously along the lifting groove 14 through the bearing plate 52, precisely adjusting the height of the lifting lug sleeve 6 so that it is flush with the position to be welded on the cylinder body 2 (i.e., the lifting lug sleeve 6 and the positioning hole 15 are on the same axis). Activate the third hydraulic telescopic cylinder 71 again to push the lifting lug sleeve 6 towards the cylinder body 2 so that its end fits against the outer wall of the cylinder body 2, completing the final axial alignment.

[0059] Welding and Rotation: After all positioning and fixing steps are completed, welding can begin. During the welding process, the rotating platform 82 on the base 8 can rotate as needed, driving the entire base 1 and the workpiece to rotate, which facilitates welding at different positions.

[0060] Reset and removal of parts: After welding is completed, each mechanism is reset in sequence (air expansion shaft 74 is deflated, each hydraulic telescopic cylinder is retracted), and the welded workpiece can be removed.

[0061] Furthermore, by setting a variable diameter ring (not shown in the figure) in the positioning groove 11 and positioning hole 15, cylinders 2 and lifting lug sleeves 6 of different specifications can be quickly adapted. The arc-shaped positioning part 16 adopts a detachable structure. By replacing the arc-shaped positioning part 16 of different specifications, it can be adapted to the arc-shaped slot 61 of different specifications. Semi-arc pads of different specifications (not shown in the figure) can be stacked in the arc-shaped groove 41 to achieve precise bearing and positioning of lifting lug sleeves 6 of different specifications.

[0062] In one embodiment of this utility model, such as Figure 3 As shown, the cylinder fixing mechanism 3 includes a 7-shaped bracket 31, a first hydraulic telescopic cylinder 32, and a pressure plate 33, wherein,

[0063] The 7-shaped bracket 31 is integrally formed and set on the top of the base 1 and located outside the positioning groove 11. The first hydraulic telescopic cylinder 32 is fixedly connected to the top of the 7-shaped bracket 31. The output end of the first hydraulic telescopic cylinder 32 passes through the bottom of the 7-shaped bracket 31 and is fixedly connected to the pressure plate 33. The bottom of the pressure plate 33 abuts against the top of the cylinder body 2.

[0064] Specifically, the 7-shaped bracket 31 is integrally formed on the top of the base 1, providing stable support for the first hydraulic telescopic cylinder 32. When the cylinder is driven, its output end passes through the bottom of the bracket and drives the pressure plate 33 to move up and down, thereby realizing the rapid pressing, fixing and releasing of the cylinder 2 in the positioning groove 11.

[0065] In one embodiment of this utility model, such as Figures 1-4 As shown, the positioning groove 11 is adapted to the outer dimensions of the cylinder body 2, the positioning hole 15 is adapted to the outer dimensions of the lifting lug sleeve 6, and the arc-shaped positioning part 16 is adapted to the outer dimensions of the cylinder body 2.

[0066] Specifically, the positioning groove 11 is adapted to the cylinder body 2: This is the main positioning reference for the cylinder body 2. The arc-shaped contour of the positioning groove 11 perfectly matches the outer circular contour of the cylinder body 2, ensuring that the cylinder body 2 cannot move left or right or back and forth on the horizontal plane, providing a stable and accurate foundation for all subsequent positioning steps. The positioning hole 15 is adapted to the lifting lug sleeve 6: This is the final coaxiality reference for the lifting lug sleeve 6. When the slide 4 drives the lifting lug sleeve 6 to descend, the lifting lug sleeve 6 will be inserted into the positioning hole 15. Since the hole diameter and the outer diameter of the lifting lug sleeve 6 are precisely matched, this step forces calibration. The coaxiality of the lifting lug sleeve 6 was corrected so that its axis is highly consistent with the axis of the cylinder body 2. The arc-shaped positioning part 16 is adapted to the cylinder body 2: This is an auxiliary positioning and guiding reference. The contour of the arc-shaped positioning part 16 is consistent with the outer circle of the cylinder body 2. It plays a role in two aspects: radial pre-positioning: Before the lifting lug sleeve 6 is inserted into the positioning hole 15, it provides a stable radial support to prevent it from tipping over. Axial guidance: When the lifting lug sleeve 6 is pushed towards the cylinder body 2, it acts as a guide surface to ensure that its movement trajectory is accurate and can finally fit perfectly with the outer wall of the cylinder body 2.

[0067] In one embodiment of this utility model, such as Figure 2 As shown, the synchronization mechanism 5 includes a second hydraulic telescopic cylinder 51, a bearing plate 52, and fixing bolts 53, wherein,

[0068] The seat 1 has a central cavity 100 inside and a side cavity 200 outside the central cavity 100, which is connected to the inside of the lifting groove 14. The second hydraulic telescopic cylinder 51 is fixedly connected to the bottom wall of the central cavity 100. The bearing plate 52 is fixedly connected to the output end surface of the second hydraulic telescopic cylinder 51 and is vertically slidably connected to the inner wall of the central cavity 100. Both ends of the bearing plate 52 penetrate into the side cavity 200 and are fixedly connected to the bottom of the slide 4 by fixing bolts 53.

[0069] Limiting blocks 43 and limiting grooves 17 are respectively provided on the surface of the slide block 4 and the inner wall of the side cavity 200. The limiting blocks 43 are vertically slidably connected to the inner wall of the limiting grooves 17.

[0070] Specifically, the second hydraulic telescopic cylinder 51 in the central cavity 100 drives the bearing plate 52 to slide up and down. The two ends of the bearing plate 52 drive the two side slides 4 to rise and fall synchronously through the side cavity 200 via the fixing bolts 53, thereby realizing the height adjustment of the lifting lug sleeve 6. The limiting block 43 of the slide 4 cooperates with the limiting groove 17 of the side cavity 200 to ensure smooth and accurate lifting.

[0071] In one embodiment of this utility model, such as Figure 4 As shown, a groove is provided on the surface of the fixed shaft 73 near the end of the lifting lug sleeve 6, and an elastic locking rod 75 is provided on the inner wall of the groove. The pressure sensor is located on the inner wall of the groove and is in contact with the inner end surface of the elastic locking rod 75.

[0072] Specifically, the pressure sensor is designed at the rear end of the elastic lever 75. When the lever pops out and contacts the surface of the arc-shaped positioning part 16 and the cylinder body 2, the resulting reaction force is transmitted to the pressure sensor. The sensor feeds back the pressure signal to the controller 81, and the system determines that the lifting lug sleeve 6 has reached the correct position, thereby accurately controlling the subsequent inflation of the air shaft 74 and the stopping action of the hydraulic cylinder.

[0073] In one embodiment of this utility model, such as Figure 1 As shown, it also includes a base 8, on the top of which a controller 81 and a rotating platform 82 are respectively installed. The rotating platform 82 is driven by a hydraulic motor built into the base 8. The seat body 1 is fixedly connected to the top of the rotating platform 82. The third hydraulic telescopic cylinder 71, the first hydraulic telescopic cylinder 32, the second hydraulic telescopic cylinder 51, the pressure sensor, the air shaft 74 and the hydraulic motor are all connected to the controller 81 through wires to realize data transmission and control command reception.

[0074] Specifically, the base 8 is equipped with a controller 81 and a rotating platform 82 driven by a hydraulic motor. The base 1 is fixedly connected to the rotating platform 82. The controller 81 is connected to and coordinates the control of three hydraulic telescopic cylinders, pressure sensors, air shafts 74 and hydraulic motors through wires, realizing centralized transmission and reception of signal feedback and action commands, driving the rotating platform 82 to rotate the workpiece as needed, improving welding convenience and automation level.

[0075] In summary, the present invention provides a hydraulic cylinder lifting lug welding fixture. The present invention achieves high-precision positioning and stable fixing of the cylinder body 2 and the lifting lug sleeve 6 through the positioning groove 11, the arc-shaped positioning part 16, and the coaxial fixing mechanism 7. The synchronization mechanism 5 ensures height alignment, the rotating platform 82 facilitates all-round welding, and the controller 81 realizes automated operation, effectively improving welding quality and efficiency.

[0076] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A welding fixture for hydraulic cylinder lifting lugs, characterized in that, include: The base (1) has a positioning groove (11), an inner vertical frame (12), an outer vertical frame (13), and a lifting groove (14) arranged sequentially from the inside to the outside. The positioning groove (11) contains a cylinder (2), and a cylinder fixing mechanism (3) is provided on the outside of the positioning groove (11). The inner vertical frame (12) and the outer vertical frame (13) are provided with positioning holes (15) at corresponding positions on their surfaces. The outer vertical frame (13) is provided with an arc-shaped positioning part (16). The inner wall of the lifting groove (14) is vertically slidably connected to a slide block (4). The slide block (4) is driven by a synchronization mechanism (5) inside the base (1). The top of the slide (4) has an arc-shaped groove (41) in which a lifting lug sleeve (6) is built. The lifting lug sleeve (6) has an arc-shaped slot (61) on one end near the outer vertical frame (13) that matches the outer dimensions of the arc-shaped positioning part (16). The L-shaped bracket (42) of the slide (4) is provided with a coaxial fixing mechanism (7). The coaxial fixing mechanism (7) includes: The third hydraulic telescopic cylinder (71) is fixedly connected to the surface of the L-shaped bracket (42); Limiting disc (72): It is horizontally slidably connected to the surface of the L-shaped bracket (42) and connected to the output end of the third hydraulic telescopic cylinder (71); Fixed shaft (73): It is fixedly connected to the surface of the limiting disc (72) and located inside the lifting lug sleeve (6); Pressure sensor: disposed on the end face of the fixed shaft (73); Air expansion shaft (74): evenly distributed on the surface of the fixed shaft (73).

2. The hydraulic cylinder lifting lug welding fixture according to claim 1, characterized in that, The cylinder fixing mechanism (3) includes a 7-shaped bracket (31), a first hydraulic telescopic cylinder (32), and a pressure plate (33), wherein, The 7-shaped bracket (31) is integrally formed and installed on the top of the base (1) and located outside the positioning groove (11). The first hydraulic telescopic cylinder (32) is fixedly connected to the top of the 7-shaped bracket (31). The output end of the first hydraulic telescopic cylinder (32) passes through the bottom of the 7-shaped bracket (31) and is fixedly connected to the pressure plate (33). The bottom of the pressure plate (33) abuts against the top of the cylinder body (2).

3. The hydraulic cylinder lifting lug welding fixture according to claim 1, characterized in that, The positioning groove (11) is adapted to the outer dimensions of the cylinder body (2), the positioning hole (15) is adapted to the outer dimensions of the lifting lug sleeve (6), and the arc-shaped positioning part (16) is adapted to the outer dimensions of the cylinder body (2).

4. The hydraulic cylinder lifting lug welding fixture according to claim 1, characterized in that, The synchronization mechanism (5) includes a second hydraulic telescopic cylinder (51), a bearing plate (52), and fixing bolts (53), wherein, The seat (1) has a central cavity (100) inside, and a side cavity (200) is opened on the outside of the central cavity (100) and is connected to the inside of the lifting groove (14). The second hydraulic telescopic cylinder (51) is fixedly connected to the bottom wall of the central cavity (100). The bearing plate (52) is fixedly connected to the output end surface of the second hydraulic telescopic cylinder (51) and is vertically slidably connected to the inner wall of the central cavity (100). Both ends of the bearing plate (52) penetrate into the side cavity (200) and are fixedly connected to the bottom of the slide (4) by the fixing bolt (53). The sliding block (4) is provided with a limiting block (43) and a limiting groove (17) respectively at the positions corresponding to the inner wall of the side cavity (200). The limiting block (43) is vertically slidably connected to the inner wall of the limiting groove (17).

5. The hydraulic cylinder lifting lug welding fixture according to claim 1, characterized in that, The fixed shaft (73) has a groove on one end of its surface near the lug sleeve (6), and an elastic lever (75) is provided on the inner wall of the groove. The pressure sensor is located on the inner wall of the groove and is in contact with the inner end surface of the elastic lever (75).

6. The hydraulic cylinder lifting lug welding fixture according to claim 1, characterized in that, It also includes a base (8), on the top of which a controller (81) and a rotating platform (82) are respectively provided. The rotating platform (82) is driven by a hydraulic motor built into the base (8). The seat (1) is fixedly connected to the top of the rotating platform (82). The third hydraulic telescopic cylinder (71), the first hydraulic telescopic cylinder (32), the second hydraulic telescopic cylinder (51), the pressure sensor, the air shaft (74) and the hydraulic motor are all connected to the controller (81) through wires to realize data transmission and control command reception.

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