An inner lining device for electron beam re-welding of a waist type blind hole part

Abstract

This utility model relates to an inner liner device for electron beam re-welding of waist-shaped blind hole parts, which is suitable for solving the re-welding of electron beam welding of waist-shaped blind hole parts. It includes an inner liner ring, a top rod close to the inner liner ring, a top plate located at the tail of the top rod, and a locking screw connected to the top rod and the top plate. The inner liner ring is a split structure, which is assembled from at least two arc-shaped segments. The top rod is also a split structure, which is assembled from a long square tube and a round steel fixed on the long square tube and is in a T-shape. An internal threaded hole is opened at the tail of the round steel of the top rod. The top plate is a long square tube, and an internal threaded hole matching the head thread of the locking screw is opened in its center. The locking screw is screwed into the internal threaded hole opened at the tail of the round steel of the top rod, which together with the top plate constitutes the axial adjustment and fixing structure of the top rod. This device can be reused, is simple to manufacture, and is convenient to use.

Description

Technical Field

[0001] This utility model belongs to the field of welding technology, and in particular relates to an inner liner device for electron beam re-welding of waist-shaped blind hole parts, which is suitable for solving the re-welding of electron beam welding of waist-shaped blind hole parts. Background Technology

[0002] Currently, there is a type of waist-shaped blind hole part where the inner diameters at both ends are smaller than the middle diameter, the head diameter is an arc, and the tail diameter is a stepped hole. This waist-shaped blind hole part is formed by electron beam welding of the head and body parts. To prevent weld leaks and workpiece misalignment during welding, an inner liner ring is required to precisely fix the head and body before welding. After electron beam welding, the weld seam needs to be radiographically inspected, and the inspection results must comply with NB / T47013.2-2015. Because radiographic inspection does not allow irregularities on the surface to obscure or interfere with the radiographic film, the surface of the welded joint must pass visual inspection. Therefore, it is necessary to remove the inner liner ring and the weld bead on the outer surface of the blind hole part by machining before radiographic testing. However, for blind hole parts that fail radiographic inspection, the inner liner ring has already been machined off. This is because the size of the inner liner ring is larger than the size of the tail inner hole, and the welding depth is relatively deep. Since the inner hole is an arc shape, it is impossible to directly and precisely assemble the entire inner liner ring into the welding position. Therefore, an inner liner ring device is needed to solve the problem of electron beam re-welding of this type of waist-shaped blind hole part. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide an inner lining device for electron beam re-welding of waist-shaped blind hole parts that is simple to manufacture, easy to use, can accurately and reliably position the welding position of waist-shaped blind hole parts, and can adjust the size of the inner lining device according to the inner hole size of the waist-shaped blind hole parts.

[0004] The technical solution of this utility model is implemented as follows: an inner liner device for electron beam re-welding of waist-shaped blind hole parts includes an inner liner ring, a top rod closely abutting the inner liner ring, a top plate located at the tail of the top rod, and a locking screw connected to the top rod and the top plate. The inner liner ring is a split structure, composed of at least two arc-shaped segments joined together. The top rod is also a split structure, assembled from a long square tube and a round steel fixed on the long square tube in a T-shape, with an internal threaded hole at the tail of the round steel of the top rod. The top plate is a long square tube with an internal threaded hole at its center that matches the thread of the head of the locking screw. The locking screw is screwed into the internal threaded hole at the tail of the round steel of the top rod, together with the top plate, forming an axial adjustment and fixing structure for the top rod.

[0005] The split structure of the inner lining ring is specifically composed of two or more pieces temporarily fixed by mortise and tenon joints or adhesive bonding. Mortise and tenon joints or adhesive bonding structures are provided at each splicing joint of the inner lining ring, and it is temporarily fixed by spot welding.

[0006] The split structure of the top rod is specifically formed by a long square tube and a round steel bar temporarily fixed by a clearance fit. The internal threaded hole at the tail end of the round steel bar matches the central threaded hole of the top plate and the thread of the locking screw head.

[0007] The top plate is a square tube, and the length L7 of the square tube is greater than the diameter of the inner hole at the tail end of the blind hole waist-shaped part.

[0008] The locking screw, together with the top plate and the top rod, forms a locking structure to prevent loosening.

[0009] The positive effects of this utility model are as follows: To solve the defects of the inner liner ring being unable to be installed into the small hole, inaccurate positioning, and welding displacement during electron beam re-welding of waist-shaped blind hole parts, a design consisting of a split inner liner ring, a split top rod, and an axial locking design composed of the top rod and the top plate adjusting bolt is adopted. The split inner liner ring is composed of at least two arc-shaped segments. The internal thread at the tail end of the top rod matches the central thread of the top plate and the thread of the adjusting bolt. When the inner liner ring of this device is a split structure, it can be smoothly assembled after entering the opening of the blind hole part and temporarily fixed into one piece. The axial movement generated by the axial mechanism of the adjusting bolt pushes the split inner liner ring to accurately reach the welding position, with a positioning accuracy of ±0.5mm and a single assembly time of ≤10 minutes. Since the inner liner ring and the top rod are both split temporary fixing structures, this inner liner device for electron beam re-welding of waist-shaped blind hole parts can achieve the effect of convenient, efficient, and accurate positioning and welding of waist-shaped blind hole parts. This device is reasonably designed, simple to manufacture, low in cost, easy to use, and can be used universally within a certain range according to the size of the hole of the waist-shaped blind hole part. Attached Figure Description

[0010] Figure 1 This is a welding schematic diagram of a waist-shaped blind hole part.

[0011] Figure 2 This is a schematic diagram of a waist-shaped blind hole part after welding.

[0012] Figure 3 This is an assembly drawing of the inner liner device for electron beam re-welding of a waist-shaped blind hole part according to this utility model.

[0013] Figure 4 This is a left view of the inner lining ring of an electron beam re-welding device for a waist-shaped blind hole part according to this utility model.

[0014] Figure 5 This is a front view of the inner lining ring of an electron beam re-welding device for a waist-shaped blind hole part according to this utility model.

[0015] Figure 6 This is a front view of the top rod of the inner liner device for electron beam re-welding of a waist-shaped blind hole part according to this utility model.

[0016] Figure 7 This is a left view of the top plate of the inner liner device for electron beam re-welding of a waist-shaped blind hole part according to the present invention. Detailed Implementation

[0017] like Figure 1 , 2 As shown, a waist-shaped blind hole part is formed by welding a head 6 and a body 9 with the original inner liner ring 7. The left end is a blind hole, and the inner diameters at both ends are smaller than the middle diameter. The weld 8 of the head and body is located at the left end of the blind hole part, and is deep from the tail end face. Before radiographic inspection, it was machined into an arc on a lathe. It failed the radiographic inspection and needs to be re-welded. However, the original inner liner ring 7 has been machined off. Figure 2 As shown, the outer circle of the original inner liner ring 7 is larger than the inner hole ΦD3 at the tail end of the blind hole part. The inner hole has been machined into an arc and is deep, making accurate positioning impossible. Therefore, an inner liner ring device needs to be manufactured to meet the requirements of re-welding. Figure 3 The device shown is an inner liner for electron beam re-welding of a waist-shaped blind hole part, comprising a waist-shaped blind hole part 1, an inner liner ring 2, a top rod 3, a top plate 4, and an adjusting bolt 5.

[0018] like Figure 3 As shown, an inner liner device for electron beam re-welding of waist-shaped blind hole parts includes an inner liner ring 2, a push rod 3 closely abutting the inner liner ring 2, a top plate 4 located at the tail of the push rod 3, and a locking screw 5 connected to the push rod 3 and the top plate 4. The inner liner ring 2 is a split structure, composed of at least two arc-shaped segments joined together. The push rod 3 is also a split structure, assembled from a long square tube and a round steel fixed on the long square tube in a T-shape, with an internal threaded hole at the tail of the round steel of the push rod 3. The top plate 4 is a long square tube with an internal threaded hole at its center that matches the head thread of the locking screw 5. The locking screw 5 is screwed into the internal threaded hole at the tail of the round steel of the push rod 3, together with the top plate 4, forming an axial adjustment and fixing structure for the push rod.

[0019] like Figure 4 , 5 As shown, the split structure of the inner lining ring 2 is specifically composed of two or more pieces temporarily fixed by mortise and tenon joints or adhesive bonding. Mortise and tenon joints or adhesive bonding structures are provided at each splicing joint of the inner lining ring, and it is temporarily fixed by spot welding. The inner lining ring 2 can be disassembled and reused. The outer circle dimensions ΦD1, ΦD2,R match the inner hole dimensions ΦD1, ΦD2,R at the weld position on the left end of the blind hole waist-shaped part, ensuring that the inner lining ring (2) is accurately positioned at the weld position when it is pushed into the blind hole waist-shaped part.

[0020] like Figure 6 As shown, the split structure of the top rod 3 is specifically formed by a long square tube and a round steel temporarily fixed by a clearance fit. The internal threaded hole at the tail end of the round steel matches the central threaded hole of the top plate 4 and the thread on the head of the locking screw 5.

[0021] The length L3 of the square tube at the left end of the push rod is greater than the size of the inner hole of the inner liner ring, so that it can push the inner liner ring to move inward along the inner hole. The total length L4 of the push rod should be greater than the depth L1 of the weld bead position of the blind hole waist-shaped part by 150mm to 200mm for easy adjustment. The depth L5 of the blind hole in the center of the push rod square tube is equal to half the thickness of the square tube. The end of the push rod has an internal thread. The internal thread size M of the push rod 3, the thread size M of the top plate 4, and the thread size M of the locking screw 5 are matched. When the device is assembled, the length of the locking screw 5 is greater than the length of the push rod 3 to ensure that the end face of the blind hole workpiece is exposed by 50-80mm after being screwed into the push rod 3 for easy operation.

[0022] like Figure 7 As shown, the top plate 4 is a square tube, and the length L7 of the square tube is 10-20mm larger than the inner diameter of the tail end of the blind hole waist-shaped part 1. The center has an internal thread size M that matches the threads of the top rod 3 and the locking screw 5.

[0023] The locking screw 5, together with the top plate 4 and the top rod 3, forms a locking structure to prevent loosening. The locking screw 5 is an external hexagonal bolt, and its thread matches the thread M of the top rod 3 and the top plate 4.

[0024] In use, the inner liner ring 2 of the split device is inserted into the inner hole of the blind hole waist-shaped part and assembled by mortise and tenon joints, spot welding or bonding. Then, the square tube of the push rod 3 is inserted into the inner hole and fixed to the inner liner ring by spot welding or bonding. Then, the center hole of the push rod 3 is inserted into the square tube of the push rod, and the push rod 3 is pushed to push the inner liner ring 2 to the bottom. Since the outer circle of the inner liner ring 2 matches the size of the weld position, after the inner liner ring 2 is pushed to the bottom, it is accurately positioned at the weld position. Then, the top plate 4 is placed in, and the adjusting bolt is screwed in. Under the action of the threaded adjustment mechanism, the inner liner ring 2 of the split device is fixed, and re-welding can begin. The device can be disassembled and reused.

[0025] This utility model comprises four main components: an inner liner ring 2, a top rod 3, a top plate 4, and a locking screw 5. The precise positioning and fixation of the inner liner ring of the blind hole part is achieved through a detachable structure and locking screw. The shape of the blind hole part is as follows: the diameters at both ends of the inner hole are smaller than the middle diameter, and the inner hole at the re-welding position is an arc. The inner liner ring is a split type, connected by mortise and tenon joints or adhesive bonding. The outer circle of the inner liner ring has an arc that matches the arc at the welding position. The top rod is a split, detachable structure consisting of a square tube and a round steel bar, shaped like a T. The front square tube of the top rod is temporarily fixed to the inner liner ring, and the front square tube of the top rod is temporarily fixed to the round steel bar. One end of the tail has an internal thread structure. The top plate 4 is a long square tube with a threaded hole machined in the center, and a locking screw 5 is screwed into the internal thread at the tail of the top rod 3. During assembly, the inner liner ring assembly is inserted through the small hole at the tail of the blind hole part and connected through the detachable structure. The round steel of the push rod 3 is inserted into the blind hole in the center of the square tube of the push rod 3 and temporarily fixed to the inner liner ring 2. The inner liner ring 2 is pushed and the locking screw 5 is screwed into the thread at the tail end of the push rod 3. While screwing in the locking screw 5, the inner liner ring 2 is pushed to the weld area and finally locked and fixed.

Claims

1. A liner device for electron beam re-welding of a waist-shaped blind hole part, comprising an inner liner ring (2), a push rod (3) closely abutting the inner liner ring (2), a top plate (4) located at the tail of the push rod (3), and a locking screw (5) connected to the push rod (3) and the top plate (4), characterized in that: The inner lining ring (2) is a split structure, which is composed of at least two arc-shaped segments; the top rod (3) is also a split structure, which is assembled from a long square tube and a round steel fixed on the long square tube and is in the shape of a T. An internal thread hole is opened at the tail of the round steel of the top rod (3); the top plate (4) is a long square tube, and an internal thread hole matching the head thread of the locking screw (5) is opened in its center; and the locking screw (5) is screwed into the internal thread hole opened at the tail of the round steel of the top rod (3), which together with the top plate (4) constitutes the axial adjustment and fixing structure of the top rod.

2. The inner liner device for electron beam re-welding of waist-shaped blind hole parts according to claim 1, characterized in that: The split structure of the inner lining ring (2) is specifically formed by two or more pieces temporarily fixed by mortise and tenon structure or adhesive method. Mortise and tenon structure or adhesive structure is provided at each splicing joint of the inner lining ring, and it is temporarily fixed by spot welding.

3. The inner liner device for electron beam re-welding of waist-shaped blind hole parts according to claim 1, characterized in that: The split structure of the top rod (3) is specifically made of a long square tube and a round steel temporarily fixed by a gap fit. The internal threaded hole at the tail end of the round steel matches the central threaded hole of the top plate (4) and the threaded head of the locking screw (5).

4. The inner liner device for electron beam re-welding of waist-shaped blind hole parts according to claim 1, characterized in that: The top plate (4) is a square tube, and the length L7 of the square tube is greater than the diameter of the inner hole at the tail end of the blind hole waist-shaped part (1).

5. The inner liner device for electron beam re-welding of a waist-shaped blind hole part according to claim 1, characterized in that: The locking screw (5), together with the top plate (4) and the top rod (3), forms a locking structure to prevent loosening.

Images