Welding clamp for man-made wind pipe seam welding

Abstract

The welding fixture comprises at least one left clamping block and at least one right clamping block, the left clamping block and the right clamping block are arranged in a left-right spaced mode, the left clamping block and the right clamping block on the left side and the right side are correspondingly arranged, and the distances between the left clamping block and the right clamping block which correspond to each other are consistent. The right end face of each left clamping block and the left end face of each right clamping block are each provided with an arc-shaped groove smaller than a semicircle, the radians of the arc-shaped grooves are consistent, and the connecting line between the centers of every two corresponding arc-shaped grooves is consistent with the outer diameter of an air duct to be welded. The arc-shaped grooves of the left clamping blocks and the right clamping blocks in the left row and the right row form a to-be-welded air duct clamping space; at least one pipe edge guiding inner support capable of moving and positioning in the axis direction of the to-be-welded air pipe clamping space is arranged on the outer side of the to-be-welded air pipe clamping space and comprises an arc-shaped upper supporting plate and an arc-shaped lower supporting plate, and the upper supporting plate and the lower supporting plate are connected through a vertically-arranged connecting piece. The upper supporting plate and / or the lower supporting plate can move up and down and be positioned, and pipe edges on the two sides of the pipe seam of the air pipe to be welded are guided.

Description

Technical Field

[0001] The utility model relates to the field of pipe welding, in particular to a welding clamp for welding pipe seams of civil air-protection pipes. Background Art

[0002] In civil air defense projects, multiple air ducts are usually installed to ensure good ventilation and exhaust harmful gases. Generally speaking, civil air defense air ducts are circular, formed by curling a rectangular steel plate and welding the two ends of the plate to form a closed whole. The plate has a certain rolling property after curling, and the civil air defense air duct has a large diameter and heavy weight, so it is very difficult to control when directly welded, which will affect the welding accuracy.

[0003] In order to prevent the pipe from rolling during the welding process and facilitate the welder to weld, the Chinese patent application number 201721627925.4 discloses a welding fixture for welding the pipe seam of a tubular part, including a main positioning block, the main positioning block includes a left vertical plate and a right vertical plate arranged vertically and parallel to each other, the upper end of the left vertical plate is bent toward the direction of the right vertical plate to form a left elbow, the lower ends of the left vertical plate and the right vertical plate are connected as a whole through a cross plate, a socket is provided on the cross plate, a secondary positioning block is detachably inserted in the socket, the upper end of the secondary positioning block is bent toward the direction of the left vertical plate to form a right elbow, and the height of the right elbow is flush with that of the left elbow, and a bolt hole is horizontally provided on the right vertical plate opposite to the position of the secondary positioning block, and a tightening bolt for tightening the secondary positioning block is threadedly connected in the bolt hole. The above-mentioned welding fixture realizes the left and right clamping and positioning of the pipeline through the left vertical plate and the right vertical plate, which can ensure that the pipeline remains fixed and does not roll during welding. However, the above welding fixture cannot shape the pipe, and for the pipe with a smaller thickness to be welded, the welding edges are easy to overlap, which affects the welding. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a welding clamp for welding the seams of civil air-protection ducts, so as to solve the problem that the welding clamps during existing pipeline welding cannot shape the pipelines and guide and align the welding edges.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A welding fixture for welding pipe seams of civil air-defense ducts, comprising at least one left clamp block and a right clamp block arranged at intervals on the left and right sides, the left clamp block and the right clamp block on the left and right sides being arranged correspondingly, and the spacing between the two corresponding left clamp blocks and right clamp blocks being consistent; an arc groove smaller than a semicircular arc is provided on the right end face of each left clamp block and the left end face of each right clamp block, the curvature of each arc groove is consistent, and the connecting line between the centers of the two corresponding arc grooves is consistent with the outer diameter of the air duct to be welded; the arc grooves of the left and right rows of left clamp blocks and right clamp blocks form a clamping space for the air duct to be welded; at least one pipe edge guiding inner support which can move and position along the axial direction of the clamping space for the air duct to be welded is provided on the outside of the clamping space for the air duct to be welded, and the pipe edge guiding inner support comprises an upper support plate and a lower support plate in the shape of an arc, the upper support plate and the lower support plate are connected by a vertically arranged connecting piece, and the upper support plate and / or the lower support plate can move up and down and position to guide the pipe edges on both sides of the pipe seam of the air duct to be welded. In this way, a clamping channel can be formed by the arc grooves on both sides whose arc length is less than a semicircular arc. When in use, the air duct to be welded is inserted into the space from one side of the clamping space of the air duct to be welded (when inserting, the pipe seam is facing upward to expose the pipe seam). Since the center line of the two relative arc grooves is consistent with the outer diameter of the air duct to be welded, when the air duct to be welded is inserted into the clamping space of the air duct to be welded, the left clamping block and the right clamping block on both sides can be used to clamp and position the air duct to be welded, thereby preventing the air duct to be welded from rolling during welding. After the air duct to be welded is clamped and positioned, the pipe edge guiding inner support is controlled to extend into the air duct to be welded, and then the distance between the upper support plate and the lower support plate is adjusted so that the length of the line connecting the centers of the upper support plate and the lower support plate is equal to the inner diameter of the air duct to be welded, so that the upper support plate and the lower support plate are respectively abutted against the pipe edges on both sides of the pipe seam of the air duct to be welded and the opposite sides of the pipe edges. In the process of abutting against the two pipe edges, the support plates are respectively in contact with the two pipe edges, so that the pipe edges are bent according to the set curvature, thereby realizing the guiding alignment of the pipe edges at the pipe seam.

[0007] Furthermore, the left clamp block and the right clamp block are each provided with two, a base is provided under the left clamp block and the right clamp block, and a connecting column is provided at the lower end of each left clamp block and the right clamp block, and the lower end of each left clamp block and the right clamp block is detachably connected to the base. In this way, the left clamp block and the right clamp block can be detachably installed on the base, so that in the adaptation process, according to the diameter and length of the air duct to be welded, the left clamp block and the right clamp block that are adapted to the curvature of the air duct to be welded can be replaced in real time, thereby improving the versatility of the welding fixture.

[0008] Furthermore, a connector is provided at the lower end of each connecting column, and a plurality of dovetail grooves are provided on the base for one-to-one matching with the connectors. In this way, the left clamp block and the right clamp block are connected and installed by means of the socket connection between the lower end of the connecting column and the dovetail groove of the base, and the installation structure is stable and easy to disassemble and replace.

[0009] Furthermore, the connecting piece is cylindrical, and a vertical rod with an external thread at the lower end is connected to the lower end of the upper support plate and the upper end of the lower support plate. The vertical rod is sleeved in the through hole of the connecting piece and is threadedly connected to the connecting piece. In this way, the upper support plate and the lower support plate are both connected to the connecting piece through threads, and their positions can be adaptively adjusted according to needs. The adjustment structure is stable and the adjustment method is convenient and fast. At the same time, this method is also convenient for adjusting the distance between the upper support plate and the lower support plate after welding is completed, so that the pipe edge guide inner support can be withdrawn from the air duct.

[0010] Furthermore, a vertical plate perpendicular to the left clamping block is provided on one side or two opposite sides of the base, and a telescopic cylinder is provided on the vertical plate, and the cylinder rod of the telescopic cylinder is connected to the connecting piece. In this way, the pipe edge guide inner support is driven to extend and retract through the telescopic cylinder, and the control is accurate and fast.

[0011] Furthermore, a sleeve is provided in the middle of the connecting piece and on one side of the connecting piece facing the telescopic cylinder, and the sleeve is sleeved on the cylinder rod and can rotate and position around the cylinder rod under the action of external force. In this way, according to the position of the pipe seam, the pipe edge guide inner support can be rotated in real time so that the upper support plate or the lower support plate can correspond to the pipe seam. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the clamping state of the welding fixture for welding the pipe seam of the air duct under the condition of welding the air duct to be welded in the embodiment;

[0013] Figure 2 It is a schematic diagram of the enlarged structure of the pipe edge guide inner support in the embodiment;

[0014] Figure 3 Schematic diagram of the side structure of the welding fixture in Example 1;

[0015] Figure 4 Schematic diagram of the top view of the welding fixture in Example 2;

[0016] Figure 5 This is a side view of the welding fixture in Example 2. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0018] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] Embodiment 1:

[0020] like Figure 1-Figure 3As shown, the present embodiment provides a welding fixture for welding pipe seams of civil air-protection ducts, comprising a left clamping block 3 and a right clamping block 4 arranged at intervals on the left and right; an arc groove 5 with an arc length less than a semicircular arc is provided on the right end surface of the left clamping block 3 and the left end surface of the right clamping block 4, the curvature of each arc groove 5 is consistent, and the connecting line between the centers of two corresponding arc grooves 5 is consistent with the outer diameter of the air duct 1 to be welded; the arc grooves 5 of the left clamping block 3 and the right clamping block 4 form a clamping space for the air duct to be welded; a pipe edge guiding inner support 7 which can move and position along the axial direction of the clamping space for the air duct to be welded is provided on the outside of the clamping space for the air duct to be welded, and the pipe edge guiding inner support 7 comprises an arc-shaped upper support plate 72 and a lower support plate 73, and the upper support plate 72 and the lower support plate 73 are connected by a vertically arranged connecting piece 71, and the upper support plate 72 and / or the lower support plate 73 can move up and down and position to guide the pipe edges on both sides of the pipe seam of the air duct 1 to be welded. In this way, a clamping channel can be formed by the arc grooves 5 on both sides whose arc length is less than a semicircular arc. When in use, the air duct 1 to be welded is inserted into the space from one side of the clamping space of the air duct to be welded (when inserted, the pipe seam is facing upward to expose the pipe seam). Since the center line of the two relative arc grooves 5 is consistent with the outer diameter of the air duct 1 to be welded, when the air duct 1 to be welded is inserted into the clamping space of the air duct to be welded, the left clamping block 3 and the right clamping block 4 on both sides can be used to clamp and position the air duct 1 to be welded, so as to prevent the air duct 1 to be welded from rolling during welding. After the air duct 1 to be welded is clamped and positioned, the tube edge guiding inner support 7 is controlled to extend into the air duct 1 to be welded, and then the distance between the upper support plate 72 and the lower support plate 73 is adjusted so that the length of the center line of the upper support plate 72 and the lower support plate 73 is equal to the inner diameter of the air duct 1 to be welded, so that the upper support plate and the lower support plate 73 are respectively abutted against the tube edges on both sides of the pipe seam of the air duct to be welded and the opposite sides of the tube edges. In the process of abutting against the two tube edges, the support plates are respectively in contact with the two tube edges, so that the tube edges are bent according to the set curvature, thereby realizing the guiding alignment of the tube edges at the pipe seam 11.

[0021] A base 2 is provided under the left clamp block 3 and the right clamp block 4, and a connecting column 6 whose lower end is detachably connected to the base 2 is provided at the lower end of the left clamp block 3 and the right clamp block 4. A connecting head is provided at the lower end of each connecting column 6, and a plurality of dovetail grooves 21 for one-to-one matching with the connecting heads are provided on the base 2. The left clamp block 3 and the right clamp block 4 are connected and installed by the socket-type connection between the lower end of the connecting column 6 and the dovetail groove 21 of the base 2, and the installation structure is stable and easy to disassemble and replace.

[0022] The connecting member 71 is cylindrical, and a vertical pole with an external thread at the lower end is connected to the lower end of the upper support plate 72 and the upper end of the lower support plate 73. The vertical pole is sleeved in the through hole of the connecting member 71 and is threadedly connected to the connecting member 71. In this way, the upper support plate 72 and the lower support plate 73 are both connected to the connecting member 71 through threads, and their positions can be adaptively adjusted according to needs. The adjustment structure is stable and the adjustment method is convenient and fast. At the same time, this method is also convenient for adjusting the distance between the upper support plate 72 and the lower support plate 73 after welding is completed, so that the pipe edge guide inner support 7 can be withdrawn from the air duct. In specific implementation, a sleeve that is plugged and fixed with the end of the vertical pole can be set at the lower end of the upper support plate 72 and the upper end of the lower support plate 73, and the upper support plate 72 and the lower support plate 73 can be detachably installed on the corresponding vertical pole.

[0023] Furthermore, a vertical plate 22 perpendicular to the left clamp block 3 is provided on one side or two opposite sides of the base 2, and a telescopic cylinder is provided on the vertical plate 22, and the cylinder rod of the telescopic cylinder is connected to the connecting member 71. In this way, the pipe edge guide inner support 7 is driven to extend and retract by the telescopic cylinder, and the control is accurate and fast.

[0024] Furthermore, a sleeve 74 is provided in the middle of the connecting member 71 and on the side of the connecting member 71 facing the telescopic cylinder. The sleeve 74 is sleeved on the cylinder rod and can rotate and position around the cylinder rod under the action of external force. In this way, according to the position of the pipe seam, the pipe edge guide inner support 7 can be rotated in real time so that the upper support plate 72 or the lower support plate 73 can correspond to the pipe seam. When the pipe seam 11 of the air duct 1 to be welded is at any position outside the arc groove 5, it can correspond to the pipe seam.

[0025] Embodiment 2:

[0026] like Figure 4 , Figure 5 As shown, the welding fixture for welding the pipe seam of the air-proof duct in this embodiment is different from that in the first embodiment only in the number of the left clamp block 3 and the right clamp block 4, and the number and installation position of the pipe edge guide inner support 7. Specifically, the left clamp block 3 and the right clamp block 4 in this embodiment are provided with two each, and the left clamp block 3 and the right clamp block 4 on the left and right sides are provided one by one, the installation height of the left clamp block 3 and the right clamp block 4 on the same side are consistent, the arc centers of the arc grooves 5 of the left clamp block 3 and the arc grooves 5 of the right clamp block 4 on the same side are on the same axis, and the arcs of the arc grooves 5 of the left clamp block 3 and the arc grooves 5 of the right clamp block 4 on the same side are consistent. There are two pipe edge guide inner supports 7 in this embodiment, which are respectively located at the corresponding positions of the center of the clamping space of the air duct to be welded. A connecting column 6 whose lower end is detachably connected to the base 2 is provided at the lower end of each left clamp block 3 and the right clamp block 4, and four dovetail grooves 21 matching the lower ends of the connecting columns 6 are provided on the base 2.

[0027] In a specific implementation, a plurality of groups of mounting holes can be arranged on the base 2, a mounting plate can be arranged at the lower end of the connecting column 6, and a plurality of through holes corresponding to each group of mounting holes can be arranged on the mounting plate, so that after fasteners penetrate the through holes and are threadedly connected to the mounting holes, each left clamp block 3 and right clamp block 4 can be detachably mounted on the base 2 through the connecting column 6.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the utility model without departing from the purpose and scope of the technical solution of the utility model should be included in the scope of the claims of the utility model.

Claims

1. A welding fixture for welding seams of air-protection ducts, comprising at least one left clamp block and a right clamp block arranged at intervals on the left and right sides, the left clamp blocks and the right clamp blocks on the left and right sides are arranged correspondingly, and the spacing between the two corresponding left clamp blocks and the right clamp blocks is consistent; characterized in that: An arc groove smaller than a semicircular arc is provided on the right end face of each left clamping block and the left end face of each right clamping block, the curvature of each arc groove is consistent, and the connecting line between the centers of two corresponding arc grooves is consistent with the outer diameter of the air duct to be welded; the arc grooves of the left and right rows of left clamping blocks and right clamping blocks form a clamping space for the air duct to be welded; at least one pipe edge guiding inner support which can be moved and positioned along the axial direction of the clamping space for the air duct to be welded is provided on the outside of the clamping space for the air duct to be welded, and the pipe edge guiding inner support comprises an arc-shaped upper support plate and a lower support plate, the upper support plate and the lower support plate are connected by a vertically arranged connecting piece, and the upper support plate and / or the lower support plate can be moved up and down and positioned to guide the pipe edges on both sides of the seam of the air duct to be welded.

2. The welding fixture for welding the seam of a civil air-protection duct according to claim 1 is characterized in that: The left clamp block and the right clamp block are each provided with two, a base is provided under the left clamp block and the right clamp block, and a connecting column is provided at the lower end of each left clamp block and the right clamp block, the lower end of which is detachably connected to the base.

3. The welding fixture for welding the seam of a civil air-protection duct according to claim 2 is characterized in that: A connecting head is arranged at the lower end of each connecting column, and a plurality of dovetail grooves for one-to-one matching with the connecting heads are arranged on the base.

4. The welding fixture for welding the pipe seam of a civil air-protection duct according to claim 2 or 3, characterized in that: The connecting piece is in a cylindrical shape, and a vertical rod with an external thread at the lower end is connected to the lower end of the upper support plate and the upper end of the lower support plate. The vertical rod is sleeved in the through hole of the connecting piece and is threadedly connected to the connecting piece.

5. The welding fixture for welding seams of civil air-protection ducts according to claim 3 is characterized in that: A vertical plate perpendicular to the left clamping block is arranged on one side or two opposite sides of the base, and a telescopic cylinder is arranged on the vertical plate, and a cylinder rod of the telescopic cylinder is connected with a connecting piece.

6. The welding fixture for welding the seam of a civil air-protection duct according to claim 5 is characterized in that: A sleeve is arranged in the middle of the connecting piece and on one side of the connecting piece facing the telescopic cylinder. The sleeve is sleeved on the cylinder rod and can rotate around the cylinder rod and be positioned under the action of external force.

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