Auxiliary device for butt welding of power station pipeline or valve

Abstract

The utility model relates to an auxiliary device for butt welding of power station pipelines or valves. The auxiliary device comprises two sets of pipe centering clamping mechanisms and an axial connecting and adjusting mechanism. The two sets of pipe centering clamping mechanisms each comprise an annular clamp support and four sets of clamping execution units. A group of clamping execution units are arranged in each radial guide hole in the annular clamp bracket in a penetrating manner; each group of clamping execution units comprises a radial supporting rod, an arc-shaped pipe pressing block and an adjusting nut; the radial supporting rods penetrate through the corresponding radial guide holes in a clearance mode, the arc-shaped pipe pressing blocks are fixedly installed at the inner ends of the radial supporting rods, and the adjusting nuts are connected to the outer ends of the radial supporting rods in a threaded fit mode. The two sets of pipe centering clamping mechanisms are clamped and fixed to the outer surfaces, close to opposite openings, of the two pipes to be welded through the inner arc faces of the four arc-shaped pipe pressing blocks of the two sets of pipe centering clamping mechanisms correspondingly. The axial connecting and adjusting mechanism is connected with the annular clamp supports of the two sets of pipe centering and clamping mechanisms. The device solves the problem of joint staggering in the pipeline or valve welding process.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe valve equipment, in particular to an auxiliary device for butt welding of power station pipelines or valves. Background Art

[0002] A pipeline is a device connected by pipes, pipe connectors, valves, etc. for transporting gases, liquids or fluids with solid particles. Usually, after the fluid is pressurized by a blower, compressor, pump, boiler, etc., it flows from the high-pressure part of the pipeline to the low-pressure part, or it can also be transported by the pressure or gravity of the fluid itself. Pipelines are widely used, mainly in water supply, drainage, heating, gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, hydraulic engineering and various industrial installations.

[0003] Valve equipment is an important mechanical equipment for pipeline systems. Valve equipment is widely used and comes in a variety of types. It is mostly used as a pipeline accessory for opening and closing pipelines, controlling the flow direction, regulating and controlling the parameters of the transported medium (temperature, pressure and flow rate), and has functions such as cut-off, regulation, diversion, anti-backflow, pressure stabilization, shunt or overflow pressure relief.

[0004] Welding, also known as fusion welding, is a manufacturing process and technology for joining metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. There are many energy sources for modern welding, including gas flames, electric arcs, lasers, electron beams, friction and ultrasonic waves. In addition to being used in factories, welding can also be carried out in a variety of environments, such as the wild, underwater and in space.

[0005] Valves and pipelines are frequently used in generator sets, including pipelines of steam and water systems, pipelines of air and powder systems, pipelines of oil systems, etc. In the early stage of power station infrastructure construction, pipeline valves are welded and installed in large quantities, and during the later maintenance period, the pipelines are washed out due to long-term use, and the valves and equipment have irreparable defects, which need to be welded and replaced. In order to ensure the welding quality and avoid the occurrence of "misalignment" in welding work, in the early stage of welding work, according to the size of the pipeline diameter, the position of the welding part, and the size of the weld offset, manual adjustment, hammering, inclined iron squeeze, chain pull, jack hard top and other methods are selected for butt welding. The installation positions of various pipelines used in power stations are often special. Some pipelines are located in a suspended position. Using manpower for butt welding has no fulcrum and there are great safety hazards. When using auxiliary tools such as jacks and chain pulls, there are no platforms and hanging points. In the early stage of previous work, scaffolding and hanging points need to be set up according to the position of the pipeline to ensure the normal use of auxiliary tools, and multiple people are required to cooperate to complete the butt welding before welding. The use of scaffolding to assist in completing the work increases working time during the scaffolding erection process. During the use of the scaffolding, it occupies maintenance operation space. The use of fall chains and jacks requires the cooperation of multiple people to complete the work, which greatly reduces the efficiency of welding work. In addition, the use of scaffolding to assist in lifting operations poses a major safety hazard. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides an auxiliary device for welding pipelines or valves in power stations, which can solve the misalignment phenomenon during pipeline or valve welding, is convenient and safe to use, can save installation time, and is conducive to improving welding efficiency.

[0007] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0008] An auxiliary device for butt welding of power station pipelines or valves, comprising two sets of pipe centering clamping mechanisms and axial connection and adjustment mechanisms with the same structure;

[0009] The two groups of pipe centering clamping mechanisms each include an annular clamp bracket and four groups of clamping execution units; the annular clamp bracket is composed of two semi-annular brackets fixedly connected at both ends by bolts and nuts; four radial guide holes are evenly distributed along the circumferential direction on the annular clamp bracket, and a group of clamping execution units is inserted into each radial guide hole, and each group of clamping execution units includes a radial support rod, an arc-shaped pipe pressing block and an adjusting nut; the radial support rod is inserted into the corresponding radial guide hole in a clearance-fitting manner, the arc-shaped pipe pressing block is vertically fixedly installed on the inner end of the radial support rod, and the adjusting nut is connected to the outer end of the radial support rod by threaded fitting in a manner that it is limited along the radial direction of the annular clamp bracket and can rotate along its own axial direction;

[0010] The inner arc surfaces of the four arc-shaped pipe pressing blocks of the two groups of pipe centering and clamping mechanisms have equal radii. The inner arc surface radius of the four arc-shaped pipe pressing blocks of one group of pipe centering and clamping mechanisms is the same as the outer diameter of one pipe to be butt-welded, and the inner arc surface radius of the four arc-shaped pipe pressing blocks of the other group of pipe centering and clamping mechanisms is the same as the outer diameter of the other pipe to be butt-welded; the two groups of pipe centering and clamping mechanisms respectively form clamping fixation with the outer surfaces of the two pipes to be welded near the butt joint through the inner arc surfaces of their respective four arc-shaped pipe pressing blocks.

[0011] The axial connection and adjustment mechanism is connected to the annular fixture brackets of the two groups of pipe centering and clamping mechanisms.

[0012] Moreover, a nut limiting groove is coaxially arranged at the outer end of the radial guiding hole, and a limiting boss matching the size of the limiting groove is arranged at the inner end of the adjusting nut. The limiting boss is embedded into the limiting groove, and a limiting retaining ring is fixedly installed at the position corresponding to the limiting groove on the outer side of the annular fixture bracket through a screw, so that the adjusting nut is limited in the radial direction.

[0013] Moreover, two handles are perpendicularly welded to the adjusting nut on the opposite sides.

[0014] Moreover, the axial connection mechanism adopts four double-headed screws. Four axial through holes are evenly arranged on the two annular fixture brackets along the circumferential direction. The axial through holes on the two annular fixture brackets correspond one by one. A double-headed screw is installed in each corresponding pair of axial through holes, and locking nuts are connected to both ends of the double-headed screw, so that the two groups of pipe centering and clamping mechanisms are adjustably connected along the axial direction.

[0015] Moreover, the axial connection mechanism includes two guiding rods, a double-headed screw and a two-way adjustment component; the two-way adjustment component includes an adjustment screw and two adjustment sliders. Threads with opposite directions are arranged at both ends of the adjustment screw, and the two adjustment sliders are respectively connected to both ends of the adjustment screw; three axial through holes are arranged on the two annular fixture brackets along the circumferential direction within a range of 180°. The two relatively arranged axial through holes are guiding rod installation holes, and the other axial through hole is a screw installation hole. A slider support is arranged at the position on the outer side surface of the annular fixture bracket opposite to the screw installation hole, and a slider installation groove is arranged on the slider support. The three axial through holes on the two annular fixture brackets correspond one by one, and the slider supports on the two annular fixture brackets are opposite to each other along the axial direction; the two guiding rods are installed in the two guiding rod installation holes on the two annular fixture brackets, the double-headed screw is installed in the screw installation holes on the two annular fixture brackets, the two adjustment sliders of the two-way adjustment component are respectively embedded in the slider installation grooves on the two annular fixture brackets, and the adjustment screw is arranged in parallel with the guiding rods and the double-headed screw, so that the two groups of pipe centering and clamping mechanisms are adjustably connected along the axial direction, and locking nuts are installed at both ends of the adjustment screw.

[0016] The advantages and positive effects of the present utility model are as follows:

[0017] 1. All parts of the welding auxiliary device of the present utility model adopt threaded connection methods, which have the characteristics of simple operation, safety and reliability. Compared with the existing method of transporting and installing parts of the scaffolding, it can greatly reduce the work preparation time, installation time and installation personnel, thus improving the maintenance efficiency. Due to the use of a split structure, each part of this device can be quickly disassembled and assembled at any time, greatly improving the convenience of the device. Therefore, it is convenient to use, carry, transport and store.

[0018] 2. The four groups of clamping execution units of the welding auxiliary device of the present utility model cooperate with each other to generate acting forces on the pipeline or valve. It can firmly connect the whole device to the pipeline or valve, ensure the stability of the welding work, greatly reduce the safety hazards of using the scaffolding during the work, and ensure the smooth completion of the work.

[0019] 3. The welding auxiliary device of the present utility model adopts a method of radially adjustable pipe clamping, and the arc-shaped pipe pressing block is detachably connected to the inner end of the radial support rod, which can meet the use of various models, different diameter sizes of pipelines and valves.

[0020] 4. The welding auxiliary device of the present utility model adjusts the relative positions of the four arc-shaped pipe pressing blocks by rotating the limit wrench, so that the pipeline or valve to be welded will not have misalignment. It avoids the misalignment phenomenon during the welding process, which may cause the pipe connection strength to be greatly reduced due to insufficient thickness and stress concentration, and the pipeline fluid to have increased resistance due to turbulent flow caused by geometric roughness of the inner wall, resulting in accidents such as pipeline rupture and particle impact.

[0021] In summary, the welding auxiliary device of the present utility model is a simple-structured, easy-to-operate and safe-to-use butt welding auxiliary device for pipes or valves. This device can effectively improve work efficiency and avoid secondary damage to equipment caused by improper operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the pipe centering and clamping mechanism of the first embodiment of the present utility model;

[0023] Figure 2 is Figure 1 a partial enlarged view of A in

[0024] Figure 3 is a reference diagram of the use state of the first embodiment of the present utility model;

[0025] Figure 4 is a connection diagram of the axial connection and adjustment mechanism and the two annular fixture brackets of the second embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The structure of the present utility model will be further described below in conjunction with the accompanying drawings and through embodiments. It should be noted that this embodiment is narrative rather than restrictive.

[0027] An auxiliary device for butt welding of power station pipelines or valves. Please refer to Figures 1-4 , and its inventive point is: it includes two sets of pipe centering clamping mechanisms 1 with the same structure and an axial connection and adjustment mechanism for realizing the coaxial connection of the two sets of pipe centering clamping mechanisms.

[0028] Both sets of pipe centering clamping mechanisms include an annular fixture bracket 1.1 and four sets of clamping execution units. The annular fixture bracket is composed of two semi-circular brackets fixedly connected at both ends by bolts 1.6 and nuts. Four radial guide holes are evenly arranged on the annular fixture bracket along the circumferential direction, and a set of clamping execution units is installed in each radial guide hole. Each set of clamping execution units includes a radial support rod 1.3, an arc-shaped pipe pressing block 1.2, and an adjusting nut 1.4. The radial support rod is installed in the corresponding radial guide hole in a clearance fit manner. The arc-shaped pipe pressing block is vertically and fixedly installed at the inner end of the radial support rod. The adjusting nut is connected to the outer end of the radial support rod through thread fit in a manner that is radially limited along the annular fixture bracket and axially rotatable along itself. Specifically, a nut limiting groove can be coaxially arranged at the outer end of the radial guide hole, a limiting boss with a size matching the limiting groove is arranged at the inner end of the adjusting nut, the limiting boss is embedded into the limiting groove, and a limiting retaining ring is fixedly installed at the position corresponding to the limiting groove on the outer side of the annular fixture bracket. By positioning the outer end of the limiting boss of the adjusting nut through the limiting retaining ring, the radial limitation of the adjusting nut can be realized.

[0029] The inner arc surface radii of the four arc-shaped pipe pressing blocks of the two sets of pipe centering clamping mechanisms are equal. The inner arc surface radius of the four arc-shaped pipe pressing blocks of one set of pipe centering clamping mechanism is the same as the outer diameter of a pipe 3 to be butt welded, and the inner arc surface radius of the four arc-shaped pipe pressing blocks of the other set of pipe centering clamping mechanism is the same as the outer diameter of another pipe 4 to be butt welded. The two sets of pipe centering clamping mechanisms respectively form clamping fixation with the outer surfaces of the two pipes to be welded near the butt joint through the inner arc surfaces of their respective four arc-shaped pipe pressing blocks.

[0030] In the above structure, in order to facilitate the operation of the adjusting nut, two handles 1.5 are vertically welded on the adjusting nut in a pair of opposite sides.

[0031] In the above structure, for better adapting to the welding of pipes with different diameters, the arc-shaped pipe pressing block and the radial support rod are connected in a detachable manner. In this way, arc-shaped pressing blocks with different sizes can be used according to pipes with different diameters to achieve fitting on the outer surface of the pipe. In the present utility model, a jack 1.2.1 is provided in the middle of the arc-shaped pipe pressing block. The jack is a stepped hole with a smaller outer diameter and a larger inner diameter. An insertion head 1.3.1 is provided at the inner end of the radial support rod, and a threaded hole is provided at the end of the plug. The insertion head and the outer small hole on the arc-shaped pressing block form an insertion fit and are circumferentially limited. The form of cooperation between the directional jack and the directional plug can be adopted. A screw 1.7 is installed at the large inner hole of the jack, and the screw is locked with the threaded hole on the insertion head to achieve the fixed connection between the arc-shaped pipe pressing block and the radial support rod.

[0032] In the present utility model, the axial connection and adjustment mechanism is realized by two structural forms:

[0033] The first way: The axial connection mechanism adopts four double-headed screws 2. Four axial through holes are evenly arranged in the circumferential direction on two annular fixture brackets. The axial through holes on the two annular fixture brackets correspond one by one. A double-headed screw is inserted into each pair of corresponding axial through holes. Locking nuts are connected to both ends of the double-headed screw to achieve the centering of the two pipes to be welded, and by adjusting the locking nuts, the adjustment of the butt gap size between the two pipes to be welded is realized, thereby realizing the adjustment of the size of the butt weld.

[0034] The second way: The axial connection mechanism includes two guide rods 8, a double-headed screw, and a bidirectional adjustment component. The bidirectional adjustment component includes an adjustment screw 7 and two adjustment sliders 6. Threads with opposite directions are provided at both ends of the adjustment screw, and the two adjustment sliders are respectively connected to both ends of the adjustment screw. Three axial through holes are arranged in the circumferential direction within a range of 180° on two annular fixture brackets. Among them, two axially opposite through holes are guide rod installation holes, and the other axial through hole is a screw installation hole. A slider support 5 is provided at a position on the outer side of the annular fixture bracket opposite to the screw installation hole, and a slider installation groove is provided on the slider support. The three axial through holes on the two annular fixture brackets correspond one by one, and the slider supports on the two annular fixture brackets are axially opposite. The two guide rods are inserted into the two guide rod installation holes on the two annular fixture brackets, the double-headed screw is inserted into the screw installation holes on the two annular fixture brackets, and the two adjustment sliders of the bidirectional adjustment component are respectively embedded in the slider installation grooves on the two annular fixture brackets, so that the adjustment screw is parallel to the guide rods and the double-headed screw. By rotating the adjustment screw, the two pipes to be welded can be driven to approach or move away, realizing the adjustment of the butt gap size, thereby realizing the adjustment of the size of the butt weld. After the butt gap is adjusted in place, locking nuts are installed at both ends of the adjustment screw.

[0035] The second method is slightly more complex in structure than the first method, but it is convenient to operate and can better achieve the parallel approach or separation of the two pipes to be welded.

[0036] The specific usage method of this auxiliary device for the butt welding of power station pipelines or valves is as follows:

[0037] 1. Take various safety measures for the welding of pipelines or valves, and check whether there is any remaining medium and pressure in the pipeline.

[0038] 2. Check and replace the pipeline or valve material, pressure rating, etc., and confirm the correct replacement in combination with the equipment operating conditions.

[0039] 3. After all inspections are qualified, grind both sides of the weld joint according to the welding standard until it meets the welding standard.

[0040] 4. Measure the diameter of the pipeline or valve to be welded, and prepare arc-shaped pipe pressing blocks of corresponding sizes according to the measured dimensions.

[0041] 5. Assemble two sets of pipe centering and clamping mechanisms

[0042] 6. Sleeves the two sets of centering and clamping structures on the pipes to be welded near the butt joint respectively; then adjust the four adjusting nuts on the two sets of centering and clamping mechanisms to make the inner arc surface of the arc-shaped pipe pressing block tightly contact the inner surface of the corresponding pipeline, so as to realize the centering adjustment of the two pipes to be welded relative to their respective annular fixture brackets;

[0043] 7. Install the axial connection and adjustment mechanism on the two annular fixture brackets. For the first method, insert four double-headed screws into the four relative axial through holes on the two annular fixture brackets respectively, and then install locking nuts at both ends of the double-headed screws. Adjust the locking nuts at one end or both ends to realize the adjustment of the butt joint gap of the two pipelines to be welded. For the second method, insert two guide rods into the two relative guide rod installation holes on the two annular fixture brackets, insert the double-headed screw into the two relative screw holes on the two annular fixture brackets, and press the two adjusting sliders into the slider installation grooves on the two annular fixture brackets respectively (partially press in, and the part cooperating with the adjusting screw is located outside); then rotate the adjusting screw to realize the adjustment of the butt joint distance of the two pipes to be welded. After the adjustment is in place, install locking nuts at both ends of the double-headed screw.

[0044] When precise center alignment of the two pipes to be welded is required, the adjustment nut on a set of pipe centering and clamping mechanism can be slightly loosened to adjust the radial position of the corresponding arc-shaped pipe pressing block, so that the weld joints of the two pipes to be welded are completely aligned.

[0045] 8. When the weld joint is adjusted to the completely aligned state, perform partial welding at the position between the rods.

[0046] 9. After ensuring that the tack welding between the weld joints is firm, remove the butt welding auxiliary device.

[0047] 10. After the device is removed, fully weld the weld joints until the welding work is completed.

[0048] Although the embodiments and drawings of the present utility model are disclosed for illustrative purposes, those skilled in the art can understand that various substitutions, changes, and modifications are possible without departing from the spirit of the present utility model and the appended claims. Therefore, the scope of the present utility model is not limited to the content disclosed in the embodiments and drawings.

Claims

1. An auxiliary device for welding of power station pipelines or valves, characterized in that: It includes two sets of pipe centering clamping mechanisms and axial connection and adjustment mechanisms with the same structure; The two groups of pipe centering clamping mechanisms each include an annular clamp bracket and four groups of clamping execution units; the annular clamp bracket is composed of two semi-annular brackets fixedly connected at both ends by bolts and nuts; four radial guide holes are evenly distributed along the circumferential direction on the annular clamp bracket, and a group of clamping execution units is inserted into each radial guide hole, and each group of clamping execution units includes a radial support rod, an arc-shaped pipe pressing block and an adjusting nut; the radial support rod is inserted into the corresponding radial guide hole in a clearance-fitting manner, the arc-shaped pipe pressing block is vertically fixedly installed on the inner end of the radial support rod, and the adjusting nut is connected to the outer end of the radial support rod by threaded fitting in a manner that it is limited along the radial direction of the annular clamp bracket and can rotate along its own axial direction; The inner arc radius of the four arc-shaped tube pressing blocks of one set of tube centering clamping mechanisms is consistent with the outer diameter of one tube to be butt-welded, and the inner arc radius of the four arc-shaped tube pressing blocks of the other set of tube centering clamping mechanisms is consistent with the outer diameter of the other tube to be butt-welded; the two sets of tube centering clamping mechanisms respectively clamp and fix the outer surfaces of the two tubes to be welded close to the butts through the inner arc surfaces of their four arc-shaped tube pressing blocks; The axial connection and adjustment mechanism is connected to the annular clamp brackets of the two sets of pipe centering clamping mechanisms.

2. The auxiliary device for welding of power station pipelines or valves according to claim 1 is characterized in that: A nut limiting groove is coaxially arranged at the outer end of the radial guide hole, and a limiting boss matching the size of the limiting groove is arranged at the inner end of the adjusting nut. The limiting boss is embedded in the limiting groove, and a limiting retaining ring is fixedly installed on the outer side of the annular clamp bracket at a position corresponding to the limiting groove by screws, so that the adjusting nut is limited in the radial direction.

3. The auxiliary device for welding of power station pipelines or valves according to claim 1 is characterized in that: Two handles are vertically welded on opposite sides of the adjusting nut.

4. The auxiliary device for welding of power station pipelines or valves according to claim 1 is characterized in that: The axial connection mechanism adopts four double-headed screws, and four axial through holes are evenly distributed in the circumferential direction on the two annular clamp brackets. The axial through holes on the two annular clamp brackets correspond to each other one by one. A double-headed screw is installed in each of the two corresponding axial through holes, and locking nuts are connected to both ends of the double-headed screws, so that the two sets of pipe centering clamping mechanisms form an adjustable connection along the axial direction.

5. The auxiliary device for welding of power station pipelines or valves according to claim 1 is characterized in that: The axial connection mechanism includes two guide rods, a double-headed screw and a bidirectional adjustment component; the bidirectional adjustment component includes an adjustment screw and two adjustment sliders, the two ends of the adjustment screw are provided with threads in opposite directions, and the two adjustment sliders are respectively connected to the two ends of the adjustment screw; three axial through holes are provided on the two annular clamp brackets within a range of 180° along the circumferential direction, the two axial through holes arranged oppositely are guide rod mounting holes, and the other axial through hole is a screw mounting hole, a slider support is provided on the outer side surface of the annular clamp bracket at a position opposite to the screw mounting hole, and a sliding The two annular clamp brackets are provided with a block mounting groove, and the three axial through holes on the two annular clamp brackets correspond to each other one by one. The slider supports on the two annular clamp brackets are opposite to each other along the axial direction. The two guide rods are inserted into the two guide rod mounting holes on the two annular clamp brackets, and the double-headed screw is inserted into the screw mounting holes on the two annular clamp brackets. The two adjusting sliders of the two-way adjustment assembly are respectively embedded in the slider mounting grooves on the two annular clamp brackets, and the adjusting screw is arranged in parallel with the guide rod and the double-headed screw, so that the two sets of pipe centering clamping mechanisms form an adjustable connection along the axial direction, and locking nuts are installed at both ends of the adjusting screw.

Images