A welding fixture for L-shaped workpieces

Abstract

This utility model relates to an L-shaped workpiece welding fixture, specifically to the field of spot welding technology for two-sided fixed corner pieces in LNG ship cargo containment systems. It includes a frame, hydraulic cylinders, pneumatic cylinders, chucks, a workpiece placement platform, a rotating shaft, bearings, a connecting plate, and connecting rods. The bearings are vertically connected to both sides of the frame. The workpiece placement platform has an isosceles right-angled triangle cross-section. The rotating shafts are fixedly connected to both sides of the workpiece placement platform, passing through the bearings. A connecting rod is fixedly connected to the end of the rotating shaft. The other end of the connecting rod is hinged to the output end of the pneumatic cylinder. The bottom of the pneumatic cylinder is hinged to the bottom of the frame. A connecting plate is vertically connected to the center of the bottom surface of the workpiece placement platform. Chucks are hinged to the ends of both sides of the workpiece placement platform. The tails of the chucks are hinged to the output ends of the hydraulic cylinders. The bottoms of the two hydraulic cylinders are hinged to the connecting plate.

Description

Technical Field

[0001] This utility model relates to the field of spot welding technology for two-sided fixed corner pieces of LNG ship cargo containment systems, and more specifically, to a welding fixture for L-shaped workpieces. Background Technology

[0002] LNG carriers are internationally recognized as "three high" products: high technology, high difficulty, and high added value. LNG carriers are special vessels that transport liquefied gas at a low temperature of -162℃. They are a kind of "super refrigerated truck at sea" and are known as the "crown jewel" of the world's shipbuilding industry.

[0003] The containment system of the LNG carrier's liquid cargo tank is the core technology of the LNG carrier. The main function of the liquid cargo containment system is to store LNG cargo with a liquid temperature of -162℃.

[0004] The liquefied cargo containment system is the isolation barrier and thermal insulation system of the liquefied cargo tank. The cargo tank consists of primary and secondary thermal insulation layers and corresponding protective films. The insulation layers are composed of multiple insulating boxes, and the protective films are made of Invar material, also known as "invariant steel." The primary and secondary insulation layers provide effective thermal insulation to maintain the temperature of the cargo inside the tank during transportation. Ammonia gas is introduced during normal loading to ensure safety. Additionally, there is a liquid bend and a gas bend, used for loading and unloading LNG cargo and for the recovery and reuse of volatile gases, respectively.

[0005] The liquid cargo containment system has two main functions: 1. A completely dense metal film ensures no leakage of LNG; 2. Good thermal insulation capabilities prevent the hull from being cooled and losing strength and toughness.

[0006] Currently, when the insulation panels of the LNG cargo containment system are attached to the inner wall of the LNG cargo containment system, they are prone to falling off, resulting in unstable connections. Therefore, two-sided fixing corner brackets are used to connect and fix the insulation panels. However, there is currently no specific welding fixture for the two-sided fixing corner brackets, which leads to technical problems such as low production efficiency and low welding quality.

[0007] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content

[0008] The purpose of this utility model is to provide an L-shaped workpiece welding fixture, which improves the stability and welding speed of welding two-sided fixed corner pieces, and improves the production quality of two-sided fixed corner pieces.

[0009] This utility model provides an L-shaped workpiece welding fixture, including a frame, a hydraulic cylinder, a pneumatic cylinder, a chuck, a workpiece placement platform, a rotating shaft, bearings, a connecting plate, and a connecting rod. The bearings are vertically connected to both the left and right sides of the frame. The workpiece placement platform has an isosceles right-angled triangle cross-section. The rotating shaft is fixedly connected to both the left and right sides of the workpiece placement platform, passing through the bearings. The connecting rod is fixedly connected to the end of the rotating shaft, and the other end of the connecting rod is hinged to the output end of the pneumatic cylinder. The bottom of the pneumatic cylinder is hinged to the bottom of the frame. A connecting plate is vertically connected to the center of the bottom surface of the workpiece placement platform. Chucks are hinged to the ends of both sides of the workpiece placement platform, with the tail of the chuck hinged to the output end of the hydraulic cylinder. The bottoms of the two hydraulic cylinders are hinged to the connecting plate.

[0010] Using the above technical solution, when in use, the L-shaped workpiece is placed on both sides of the workpiece placement table, and the two hydraulic cylinders extend to push the chuck to press against the L-shaped workpiece, at which point the L-shaped workpiece is welded; when it is necessary to change the welding position, the pneumatic cylinder is controlled to extend or shorten, and the pneumatic cylinder will drive the rotating shaft to rotate through the connecting rod, thereby driving the workpiece placement table to rotate.

[0011] Furthermore, the chuck includes a fixed shaft, a connecting shaft, a connecting rod, and clamping plates; both ends of the fixed shaft are connected to the clamping plates, both ends of the connecting rod are respectively fixed to the two clamping plates, a connecting hole is provided in the middle of the lower end of the clamping plate, the connecting shaft passes through the connecting hole, both ends of the connecting shaft are fixed to the ends of the side of the workpiece placement table, and the middle of the fixed shaft is hinged to the output end of the hydraulic cylinder.

[0012] Furthermore, the chuck also includes a clamping block, which is connected to the lower part of the front end of the clamping plate, and the lower part of the clamping block is provided with a groove.

[0013] Furthermore, base plates are fixed on both sides of the bottom of the frame, and an extension plate is fixed to one end of the base plate. The bottom of the pneumatic cylinder is hinged to the extension plate.

[0014] Furthermore, limit plates are connected to both sides of the workpiece placement platform.

[0015] This utility model relates to an L-shaped workpiece welding fixture. In use, the L-shaped workpiece is placed on both sides of the workpiece placement table. Two hydraulic cylinders extend, pushing the chuck to press against the L-shaped workpiece, allowing welding to proceed. When the welding position needs to be changed, the pneumatic cylinders are extended or retracted. The pneumatic cylinders, via connecting rods, drive the rotating shaft to rotate, thereby rotating the workpiece placement table. This utility model improves the stability and welding speed of two-sided fixed corner pieces, thus increasing the production speed and quality of two-sided fixed corner pieces. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the L-shaped workpiece welding fixture provided in an embodiment of the present utility model.

[0017] Figure 2 for Figure 1 A plan view of the welding fixture for the L-shaped workpiece.

[0018] Figure 3 for Figure 1 A schematic diagram of the structure of the welding fixture for L-shaped workpieces, showing the combination of the chuck and the workpiece placement table.

[0019] Figure 4 for Figure 1 A plan view of the combination of the chuck and workpiece placement table in the welding fixture for L-shaped workpieces.

[0020] Figure 5 for Figure 1 Another structural diagram showing the combination of the chuck and workpiece placement table in the welding fixture for L-shaped workpieces.

[0021] The reference numerals and components involved in the accompanying drawings are shown below:

[0022] 1. Frame; 11. Base plate; 12. Extension plate

[0023] 2. Hydraulic cylinder; 3. Pneumatic cylinder; 4. Chuck

[0024] 41. Fixed shaft; 42. Connecting shaft; 43. Connecting rod

[0025] 44. Clamping plate; 45. Connecting hole; 46. Clamping block

[0026] 47. Groove; 48. Limiting plate; 5. Workpiece placement table

[0027] 6. Shaft 7. Bearing 8. Connecting plate

[0028] 9. Connecting rod 100, L-shaped workpiece Detailed Implementation

[0029] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0030] The terms "first," "second," "third," "fourth," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0031] Example 1

[0032] Figure 1This is a schematic diagram of the structure of the L-shaped workpiece welding fixture provided in an embodiment of the present invention. Figure 2 for Figure 1 A plan view of the welding fixture for the L-shaped workpiece. Figure 3 for Figure 1 A schematic diagram of the combined structure of the chuck and workpiece placement table in the welding fixture for L-shaped workpieces. Figure 4 for Figure 1 A plan view of the combination of the chuck and workpiece placement table in the welding fixture for L-shaped workpieces. Figure 5 for Figure 1 Another structural diagram showing the combination of the chuck and workpiece placement table in the welding fixture for L-shaped workpieces. Please refer to... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The L-shaped workpiece welding fixture provided in this embodiment includes a frame 1, a hydraulic cylinder 2, a pneumatic cylinder 3, a chuck 4, a workpiece placement platform 5, a rotating shaft 6, a bearing 7, a connecting plate 8, and a connecting rod 9. The bearing 7 is vertically connected to both the left and right sides of the frame 1. The workpiece placement platform 5 has an isosceles right-angled triangle cross-section. The rotating shaft 6 is fixedly connected to both the left and right sides of the workpiece placement platform 5, passing through the bearing 7. The connecting rod 9 is fixedly connected to the end of the rotating shaft 6, and the other end of the connecting rod 9 is hinged to the output end of the pneumatic cylinder 3. The bottom of the pneumatic cylinder 3 is hinged to the bottom of the frame 1. The connecting plate 8 is vertically connected to the center of the bottom surface of the workpiece placement platform 5. The chuck 4 is hinged to the ends of both sides of the workpiece placement platform 5. The tail of the chuck 4 is hinged to the output end of the hydraulic cylinder 2. The bottoms of the two hydraulic cylinders 2 are hinged to the connecting plate 8.

[0033] It should be noted that when using the L-shaped workpiece welding fixture of this utility model, the L-shaped workpiece 100 is placed on both sides of the workpiece placement table 5, the two hydraulic cylinders 2 extend, and push the chuck 4 to press against the L-shaped workpiece 100, at which time the L-shaped workpiece 100 is welded; when it is necessary to change the welding position, the pneumatic cylinder 3 is controlled to extend or shorten, and the pneumatic cylinder 3 will drive the rotating shaft 6 to rotate through the connecting rod 9, thereby driving the workpiece placement table 5 to rotate;

[0034] The L-shaped workpiece welding fixture of this utility model improves the stability and welding speed of welding two-sided fixed corner pieces, thereby increasing the production speed and quality of two-sided fixed corner pieces.

[0035] Further reference Figure 3 , Figure 4 , Figure 5The chuck 4 of this utility model includes a fixed shaft 41, a connecting shaft 42, a connecting rod 43, and a clamping plate 44. Both ends of the fixed shaft 41 are connected to the clamping plate 44. Both ends of the connecting rod 43 are respectively fixed to the two clamping plates 44. A connecting hole 45 is provided in the middle of the lower end of the clamping plate 44. The connecting shaft 42 passes through the connecting hole 45. Both ends of the connecting shaft 42 are fixed to the ends of the side of the workpiece placement table 5. The middle part of the fixed shaft 41 is hinged to the output end of the hydraulic cylinder 2.

[0036] Furthermore, the clamp 4 of this utility model also includes a clamping block 46, which is connected to the lower part of the front end of the clamping plate 44, and the lower part of the clamping block 46 is provided with a groove 47.

[0037] It should be noted that when the chuck 4 is pressed against the L-shaped workpiece 100, the groove 47 will engage with the L-shaped workpiece 100, improving the stability of the clamping.

[0038] Further reference Figure 1 , Figure 3 In this invention, a base plate 11 is fixed on both sides of the bottom of the frame 1, and an extension plate 12 is fixed on one end of the base plate 11. The bottom of the pneumatic cylinder 3 is hinged to the extension plate 12. Limiting plates 48 are connected to both sides of the workpiece placement table 5.

[0039] When the L-shaped workpiece 100 is placed on both sides of the workpiece placement table 5, the limiting plate 48 is used to clamp the L-shaped workpiece 100, preventing the L-shaped workpiece 100 from moving left or right, thus improving the stability of clamping.

[0040] As can be seen from the above description, the advantages of this utility model are:

[0041] This utility model relates to an L-shaped workpiece welding fixture. In use, the L-shaped workpiece is placed on both sides of the workpiece placement table. Two hydraulic cylinders extend, pushing the chuck to press against the L-shaped workpiece, allowing welding to proceed. When the welding position needs to be changed, the pneumatic cylinders are extended or retracted. The pneumatic cylinders, via connecting rods, drive the rotating shaft to rotate, thereby rotating the workpiece placement table. This utility model improves the stability and welding speed of two-sided fixed corner pieces, thus increasing the production speed and quality of two-sided fixed corner pieces.

[0042] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An L-shaped workpiece welding jig tool characterized by comprising: It includes a frame (1), a hydraulic cylinder (2), a pneumatic cylinder (3), a chuck (4), a workpiece placement table (5), a rotating shaft (6), a bearing (7), a connecting plate (8), and a connecting rod (9); The bearings (7) are vertically connected to both the left and right sides of the frame (1). The cross-section of the workpiece placement platform (5) is an isosceles right triangle. The rotating shafts (6) are fixedly connected to both the left and right sides of the workpiece placement platform (5). The rotating shafts (6) pass through the bearings (7). The connecting rods (9) are fixedly connected to the end of the rotating shafts (6). The other end of the connecting rods (9) is hinged to the output end of the pneumatic cylinder (3). The bottom of the pneumatic cylinder (3) is hinged to the bottom of the frame (1). A connecting plate (8) is vertically connected to the middle of the bottom surface of the workpiece placement platform (5). A chuck (4) is hinged to the ends of both sides of the workpiece placement platform (5). The tail of the chuck (4) is hinged to the output end of the hydraulic cylinder (2). The bottoms of the two hydraulic cylinders (2) are hinged to the connecting plate (8).

2. The L-shaped workpiece welding fixture according to claim 1, characterized in that, The chuck (4) includes a fixed shaft (41), a connecting shaft (42), a connecting rod (43), and a clamping plate (44); Both ends of the fixed shaft (41) are connected to the clamping plates (44), and both ends of the connecting rod (43) are fixed on the two clamping plates (44) respectively. A connecting hole (45) is provided in the middle of the lower end of the clamping plate (44). The connecting shaft (42) passes through the connecting hole (45). Both ends of the connecting shaft (42) are fixed to the ends of the side of the workpiece placement table (5). The middle part of the fixed shaft (41) is hinged to the output end of the hydraulic cylinder (2).

3. The L-shaped workpiece welding fixture according to claim 2, characterized in that, The clamp (4) also includes a clamping block (46), which is connected to the lower part of the front end of the clamping plate (44), and the lower part of the clamping block (46) is provided with a groove (47).

4. The L-shaped workpiece welding fixture according to claim 1, characterized in that, A base plate (11) is fixed on both sides of the bottom of the frame (1), and an extension plate (12) is fixed at one end of the base plate (11). The bottom of the pneumatic cylinder (3) is hinged to the extension plate (12).

5. The L-shaped workpiece welding fixture according to claim 1, characterized in that, Limiting plates (48) are connected to both sides of the workpiece placement platform (5).

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