A complete set of devices for welding and scribing the outlet elbow of a pump

Abstract

The present invention relates to a complete set of devices for welding and scribing the water outlet elbow of a pump, which includes a working platform, a first installation component and a second installation component. The first installation component includes a first support frame arranged on the working platform and a plurality of positioning jigs for clamping and positioning the periphery of the circular bottom plate on the elbow body. A guide rail that can be lifted and positioned in the vertical direction is provided on the first support frame. The guide rail is connected to a chuck through a central slide rod. The central slide rod is rotatably connected to a scribing sleeve, one end of the scribing sleeve is connected to a scribing rod, and the scribing rod is connected to a scribing needle that can be lifted and moved in the vertical direction. The advantages are that a projection circle can be accurately drawn on the upper curved surface wall of the elbow body for opening holes in the stuffing part and placing the stuffing box outer sleeve for welding, and good coaxiality between the stuffing box outer sleeve and the inlet flange etc. can be ensured after assembly, improving production efficiency and product quality; the overall structure is relatively simple, compared with using high-precision numerical control equipment for auxiliary processing, it greatly saves costs and is convenient to use.

Description

Technical Field

[0001] The invention belongs to the field of production and processing of elbows of pumps and similar structures, and particularly relates to a complete set of welding and scribing devices for the water outlet elbow of a pump. Background Art

[0002] The water outlet elbow of a pump is usually large in volume and weight and complex in shape, and is difficult to process. Especially for the water outlet elbow of a vertical long-shaft pump, it includes multiple structural parts such as an elbow body, a bottom plate, an inlet flange, an outlet flange, and a stuffing box part. The traditional casting production method has problems such as high difficulty, high rejection rate, and high cost. Therefore, cold working welding production is generally adopted at present. During cold working welding processing, flanges need to be welded at both ends of the elbow body and holes need to be opened at the stuffing box part for the rotating shaft of the motor to extend downward into the elbow body and then enter the inner pipe of the pump. In order to ensure the high quality of the product, the concentricity of the corresponding parts must be ensured during welding production and scribing and hole opening. Developing a high-precision numerical control processing center specifically applicable to water outlet elbow parts has high cost and great difficulty. Therefore, it is necessary to design a complete set of welding and scribing devices with relatively simple structure and capable of meeting the production accuracy requirements. Summary of the Invention

[0003] The technical problem to be solved by the invention is to provide a complete set of welding and scribing devices for the water outlet elbow of a pump, aiming at overcoming the technical defects that the processing is difficult and the concentricity of the corresponding parts is not easy to ensure during the welding and scribing and hole opening of the water outlet elbow in the prior art.

[0004] The technical solution of the invention to solve the above technical problem is as follows: A complete set of welding and scribing devices for the water outlet elbow of a pump, which includes a working platform, a first installation component for scribing at the stuffing part and placing and welding the stuffing box outer sleeve, and a second installation component for placing and welding the outlet flange. The first installation component includes a first support frame arranged on the working platform and a plurality of positioning jigs for clamping and positioning the periphery of the circular bottom plate on the elbow body. A lifting and positioning mechanism is arranged in the middle of the top of the first support frame. The lifting and positioning mechanism includes a central sliding rod that can be lifted and positioned in the vertical direction. A chuck for clamping the stuffing box outer sleeve is fixed at the lower end of the central sliding rod. The central sliding rod is rotationally connected with a scribing sleeve. One end of the scribing sleeve is connected with a scribing rod extending outward. A plurality of scribing holes are arranged at intervals on the scribing rod. A scribing needle is selectively inserted into one of the scribing holes and can move up and down in the vertical direction relative to the scribing hole. The second installation component includes a second support frame arranged on the working platform. A lifting and positioning mechanism for placing the outlet flange is arranged on the second support frame.

[0005] On the basis of the above technical solution, the invention can also be improved as follows.

[0006] Furthermore, the lifting and positioning mechanism includes a guide rail, which is a circular guide rail. A plurality of sliders of the circular guide rail are fixedly arranged on the first support frame at intervals in the vertical direction. A rack is fixed on the mounting surface of the circular guide rail. A gear meshing with the rack is connected to a bearing seat fixed on the first support frame through a central shaft. One end of the central shaft is fixedly provided with an adjusting handwheel. A brake positioning mechanism is further arranged on the first support frame. After rotating the adjusting handwheel to move the guide rail up or down by a certain distance, the guide rail can be positioned through the brake positioning mechanism.

[0007] Furthermore, the lifting and positioning mechanism includes a plurality of guide plates fixedly arranged on the first support frame at intervals in the vertical direction. A flat key extending along the axial direction is arranged on the outer wall of the central slide rod. Through holes slidably matched with the central slide rod and the flat key are formed on the guide plates. A lifting ring is fixed on the upper end surface of the central slide rod. The lifting ring is connected to a two-way self-locking hand winch fixed on the first support frame through a steel wire rope bypassing a plurality of pulleys.

[0008] Furthermore, the brake positioning mechanism includes a brake pressure rod. There are two bearing seats arranged at intervals in the front and rear. The central shaft penetrates through the two bearing seats and is in interference fit with the inner ring of the bearing in the bearing seats. An anti-slip thread is arranged on the shaft section of the central shaft between the two bearing seats. One end of the brake pressure rod is hinged to a hinge ear fixed on the first support frame, and the other end is connected to the first support frame through a locking screw. A brake pad is arranged on the upper surface of the middle part of the brake pressure rod. After the locking screw is screwed in and tightened in place, the brake pad presses against the anti-slip thread to stop and position the central shaft.

[0009] Furthermore, the chuck is a three-jaw self-centering chuck.

[0010] Furthermore, the upper and lower ends of the scribing sleeve are respectively abutted against a limit ring, and the limit ring is locked and fixed on the central slide rod. The scribing rod extends in the horizontal direction.

[0011] Furthermore, a cross center line is engraved on the upper surface of the working platform. The central axis of the central slide rod is vertically aligned with the intersection point of the center line. A plurality of groups of positioning parts are also arranged on the working platform at equal intervals in the circumferential direction with the intersection point of the center line as the center. Each group of positioning parts includes a plurality of positioning holes with gradually increasing distances from the intersection point of the center line in the radial direction. A positioning fixture is connected to each group of the positioning parts.

[0012] Furthermore, the lifting and positioning mechanism includes a lifting frame and a lifting drive device. The lifting frame is disposed within the second support frame. The lifting drive device is disposed on the second support frame or the working platform and drives the lifting frame to ascend or descend in the vertical direction from the bottom of the lifting frame. The second support frame includes a base and two vertical columns fixed to the left and right sides of the base. The tops of the two columns are fixedly connected by a transverse link. The lifting frame ascends and descends along the columns.

[0013] Furthermore, the lifting frame includes a vertical backboard and two crossbars fixed to the upper and lower parts of the rear side of the backboard. The crossbars are located between the two columns. The backboard is located outside the front sides of the two columns. The limiting mechanism includes a positioning waist-shaped hole formed in the upper part of the backboard and a support plate fixed to the lower part of the front side of the backboard. Two positioning screw holes are provided on the support plate. The lower side of the water outlet flange is pressed against the upper edge of the support plate, and bolts threadedly connected to the positioning screw holes press the back side of the lower side of the flange against the front side of the backboard in a tight fit. Bolts passing through the positioning waist-shaped hole and clamping plates arranged opposite to each other in the front and rear directions press the back side of the upper side of the water outlet flange against the front side of the backboard in a tight fit.

[0014] Furthermore, the lifting drive device is a jack. The jack is placed on the base and its telescopic end is tightly abutted against the crossbar at the lower part of the lifting frame.

[0015] Furthermore, the upper part of the positioning clamp has a support flat plate, and a tightening nut is fixed to the upper part of the outer side of the support flat plate. The central axis of the tightening nut is along the horizontal direction, and a tightening bolt is threadedly connected to the tightening nut. When the tightening bolt is tightened, it can press the outer edge end face of the bottom plate.

[0016] The beneficial effects of the present invention are:

[0017] 1) Through multiple positioning clamps fixed on multiple groups of positioning parts, the bottom plate of the outlet elbow is clamped from the periphery and the intersection of the bottom plate and the center line on the working platform is automatically aligned. At the same time, each group of positioning parts has multiple pairs of positioning holes, which can be used to clamp bottom plates of different sizes, and has good applicability; the liftable guide rail is connected to the marking sleeve and the chuck through the center slide rod at the lower end. When marking and opening a hole, since it is a circle on the curved surface wall on the upper side of the elbow body, the present invention movably connects the marking needle to the marking hole of the marking rod. When marking, the marking needle automatically rises and falls with the change of the height of the curved surface on the upper surface of the outlet elbow. In this process, the distance between the marking needle and the center line of the center slide rod remains unchanged (the radius remains unchanged), which is more convenient. And accurately draw a projection circle on the curved surface, then use a tool to drill a hole in the stuffing box along the drawn line, the center of the projection circle of the hole in the horizontal direction obviously coincides with the central axis of the center slide bar, that is, coincides with the center of the bottom plate and the center of the water inlet flange at the lower end; the packing box openings and packing box jacket installation heights corresponding to different specifications of water outlet elbows are different, and the lifting and positioning of the guide rail can meet the requirements of the packing box openings and packing box jacket installation for water outlet elbows of different heights. The lower end of the center slide bar is connected to a chuck, which can be clamped from the inner wall of the stuffing box jacket opening and automatically align to the center to ensure that after the stuffing box jacket is welded at the opening, the center of the stuffing box is aligned with the center of the water outlet flange.

[0018] 2) After the outlet elbow is clamped and positioned on the working platform, the lifting frame on the second support frame can place and limit the outlet flange, and the lifting drive device can make the outlet flange rise or fall with the lifting frame to align with the outlet end of the outlet elbow for assembly, so as to facilitate the subsequent welding of the outlet flange to the outlet elbow. There is no need to manually lift and straighten the outlet flange, and the labor intensity is low. At the same time, the lifting of the outlet flange by the lifting drive device can be more conveniently aligned with the outlet of the outlet elbow that has been positioned and fixed on the working platform, which reduces the difficulty of operation and is more efficient.

[0019] 3) The whole device has an exquisite structural design and can be well used in production processes such as welding and marking of water outlet elbows, thereby improving production efficiency and effectively improving product quality. It does not require the use of large-scale high-precision CNC equipment for auxiliary processing, and can meet product accuracy requirements, with low production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A front view of a complete set of welding and marking devices for a pump outlet elbow provided by the present invention (the guide rails are not fully shown);

[0021] Figure 2 for Figure 1 Axonometric view of the middle working platform, the bending pipe body and the first mounting assembly viewed from the left front side;

[0022] Figure 3 forFigure 1 Axonometric view of the working platform, elbow body and the first mounting assembly observed from the left rear side;

[0023] Figure 4 is Figure 2 Front view of the device shown;

[0024] Figure 5 is Figure 2 Top view of the device shown;

[0025] Figure 6 is is Figure 2 Axonometric view of components such as the guide rail, center slide bar, scribing sleeve, etc. after assembly in ;

[0026] Figure 7 is Figure 6 Front view of the structural components shown;

[0027] Figure 8 is Figure 6 Top view of the structural components shown;

[0028] Figure 9 is Figure 1 Left view of the working platform and the second mounting assembly in ;

[0029] Figure 10 is Figure 1 Top view of the working platform in ;

[0030] Figure 11 is Figure 1 Axonometric view of the second mounting assembly in ;

[0031] Figure 12 is Figure 2 Axonometric view of the positioning fixture in (the tightening bolt is not shown);

[0032] Figure 13 Axonometric view of the complete set of welding scribing device for the pump outlet elbow that realizes the lifting of the center slide bar through a two-way self-locking hand winch provided by the present invention;

[0033] Figure 14 is Figure 13 Axonometric view of the center slide bar with a flat key and its related components at the lower end in the device shown in.

[0034] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0035] 1. Working platform; 2. First support frame; 3. Elbow body; 4. Bottom plate; 5. Positioning fixture; 6. Guide rail; 7. Central slide bar; 8. Chuck; 9. Marking sleeve; 10. Marking rod; 11. Marking hole; 12. Marking needle; 13. Second support frame; 14. Water outlet flange; 15. Slide block; 16. Rack; 17. Gear; 18. Central shaft; 19. Bearing seat; 20. Adjusting handwheel; 21. Anti-slip pattern; 22. Brake lever; 23. Hinge ear; 24. Brake pad; 25. Locking screw; 26. Center line; 27. Positioning part; 28. Base; 29. Support pillar; 30. Back plate; 31. Cross bar; 32. Positioning kidney-shaped hole; 33. Support plate; 34. Positioning screw hole; 35. Support flat plate; 36. Tightening nut; 37. Limit plate; 38. Guide plate; 39. Flat key; 40. Hoisting ring; 41. Steel wire rope; 42. Pulley; 43. Two-way self-locking hand winch. Detailed implementation mode

[0036] The principles and features of the present invention will be described below in conjunction with the accompanying drawings and specific embodiments. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0037] In the description of the present invention, if terms indicating directions such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. are used, the indicated directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0038] As Figures 1 to 14 shown, the present invention provides a complete set of devices for welding and marking of the water outlet elbow for pumps, which includes a working platform 1, a first installation component for marking the packing part and placing and welding the packing gland outer sleeve, and a second installation component for placing and welding the water outlet flange 14. The first installation component includes a first support frame 2 provided on the working platform 1 and a plurality of positioning fixtures 5 for clamping and positioning the periphery of the circular bottom plate 4 on the elbow body 3. The middle of the top of the first support frame 2 is provided with a lifting and positioning mechanism. The lifting and positioning mechanism includes a central slide bar 7 that can be lifted and positioned in the vertical direction. The lower end of the central slide bar 7 is fixed with a chuck 8 for clamping the packing gland outer sleeve. The central slide bar 7 is rotationally connected with a marking sleeve 9. The marking sleeve 9 is connected to one end of an outwardly extending marking rod 10. A plurality of marking holes 11 are arranged at intervals on the marking rod 10. A marking needle 12 is selectively inserted into one of the marking holes 11 and can move up and down in the vertical direction relative to the marking hole 11. The second installation component includes a second support frame 13 provided on the working platform 1. The second support frame 13 is provided with a lifting and positioning mechanism for placing the water outlet flange 14.

[0039] It should be noted that the production, welding and assembly of the elbow body, the bottom plate and the water inlet flange are completed before using the complete set of devices of the present invention. The assembled parts after the welding and assembly of the three are placed on the complete set of devices of the present invention for clamping and positioning, scribing, hole opening, welding with stuffing box placement, alignment welding of the water outlet flange, etc. Among them, the hole opening on the upper and lower surfaces of the bottom plate can be carried out in the factory by using a bottom plate hole opening template to draw the hole opening lines on the upper and lower planes of the bottom plate, and the cutting of the bottom plate holes is completed according to the lines. The production and processing of the bottom plate, its assembly with the elbow body, and the assembly of the elbow body and the water inlet flange are well-known to those skilled in the art and can be carried out without relying on the above-mentioned complete set of devices provided by the present invention, so no further description will be given here. When the scribing needle is scribing, it can rely on its own weight to make the lower end tip of the needle fit with the curved surface wall of the elbow body and automatically lift and lower as the height of the curved surface changes.

[0040] In an embodiment of the present invention, as Figures 6 to 8 shown, the lifting and positioning mechanism includes a guide rail 6. The guide rail 6 is a circular guide rail. A plurality of sliders 15 of the circular guide rail are fixedly arranged at intervals up and down on the first support frame 2. A rack 16 is fixed on the mounting surface of the circular guide rail. A gear 17 meshing with the rack 16 is connected to a bearing seat 19 fixed on the first support frame 2 through a central shaft 18. One end of the central shaft 18 is fixedly provided with an adjusting handwheel 20. A brake positioning mechanism is also provided on the first support frame 2. After rotating the adjusting handwheel 20 to move the guide rail 6 up or down by a certain distance, the guide rail 6 can be positioned through the brake positioning mechanism.

[0041] It should be noted that the number of sliders is preferably two. As Figures 2 to 4 shown, the two sliders are fixedly arranged at intervals up and down on two transverse rods of the first support frame. The guide rail is slidably matched with the sliders, and the guide rail has only the freedom of sliding in the up and down vertical direction relative to the sliders.

[0042] In an embodiment of the present invention, the brake positioning mechanism includes a brake pressure rod 22. There are two bearing seats 19 and they are arranged at intervals front and back. The central shaft 18 passes through the two bearing seats 19 and is in interference fit with the inner ring of the bearing in the bearing seats 19. An anti-slip thread 21 is provided on the shaft section of the central shaft 18 between the two bearing seats 19. One end of the brake pressure rod 22 is hinged to a hinge ear 23 fixed on the first support frame 2, and the other end is connected to the first support frame 2 through a locking screw 25. A brake pad 24 is provided on the upper surface of the middle part of the brake pressure rod 22. After the locking screw 25 is screwed in and tightened in place, the brake pad 24 presses the anti-slip thread 21 to stop the rotation and position the central shaft 18.

[0043] It should be noted that the brake positioning mechanism is not limited to the form of hinging one end of the brake lever and adjusting the pressing force between the brake pad and the anti-slip pattern at the other end through a locking screw. It can also be in other ways, such as adjusting the pressing of the brake pad through a bolt and moving the brake lever and the brake pad together upward along the chute limiting structure to press the anti-slip pattern.

[0044] In an embodiment of the present invention, the chuck 8 is a three-jaw self-centering chuck.

[0045] It should be noted that the three-jaw self-centering chuck is a commercially available product. When the rotating part in the square hole on one side rotates to drive the internal gear disk of the chuck, the three jaws move away from or close to the center of the chuck synchronously. Therefore, when the three jaws clamp the inner diameter of the opening of the target object (the stuffing box outer sleeve), the center of the opening of the target object coincides with the center of the chuck and the central axis of the central slide rod, achieving self-centering alignment.

[0046] In an embodiment of the present invention, the upper and lower ends of the scribing sleeve 9 are each abutted against a limiting ring, the limiting ring is locked and fixed on the central slide rod 7, and the scribing rod 10 extends in the horizontal direction.

[0047] It should be noted that the scribing sleeve cannot move axially relative to the central slide rod, but can only rotate 360 degrees relative to the central slide rod circumferentially, so as to enable the scribing needle to rotate around the central axis of the central slide rod and complete the precise scribing work.

[0048] In an embodiment of the present invention, as Figure 13 and Figure 14 shown, the lifting and positioning mechanism includes a plurality of guide plates 38 fixedly arranged on the first support frame 2 at intervals up and down. A flat key 39 extending axially is provided on the outer wall of the central slide rod 7. Through holes slidably matched with the central slide rod 7 and the flat key 39 are formed on the guide plates 38. A lifting ring 40 is fixed on the upper end surface of the central slide rod 7. The lifting ring 40 is connected to a two-way self-locking hand winch 43 fixed on the first support frame 2 through a steel wire rope 41 bypassing a plurality of pulleys 42. The main parameters of the two-way self-locking hand winch used in the present invention are as follows: model 1800LB, rated lifting capacity 300 kg, steel wire rope diameter 5 mm, with a reliable two-way ratchet self-locking function, and the handle operating force under full load is 19 kg.

[0049] It should be noted that compared with the structure that realizes the lifting and positioning of the central slide rod through the guide rail and the brake positioning mechanism, in this embodiment, by providing a flat key on the central slide rod, guiding and limiting with the guide plate, and at the same time connecting the two-way self-locking hand winch through the steel wire rope, the lifting and positioning of the central slide rod are also realized, and the structure is relatively simpler, which can effectively save costs.

[0050] In one embodiment of the present invention, a cross center line 26 is engraved on the upper surface of the working platform 1, and the central axis of the center slide bar 7 is aligned with the intersection of the center line 26 in the vertical direction. The working platform 1 is also provided with a plurality of groups of positioning portions 27 that are evenly spaced in the circumferential direction with the intersection of the center line 26 as the center. Each group of positioning portions 27 includes a plurality of positioning holes whose distance from the intersection of the center line 26 gradually increases in the radial direction, and each group of the positioning portions 27 is connected to one of the positioning fixtures 5.

[0051] It can be understood that the multiple positioning holes arranged on each group of positioning parts are arranged according to the base plate diameters of multiple specifications of water outlet bends that need to be assembled and produced in the factory, ensuring that after each positioning fixture is installed at the corresponding positioning hole, the base plate of the water outlet bend of the corresponding specification can be better clamped and positioned. Figure 1 , Figure 2 and Figure 13 As shown in the drawings, the left and right side plates and the rear side plate at the bottom of the first support frame are provided with marking lines or positioning pads for aligning with the center line of the workbench. Figure 13 As shown, there are three positioning pads, which are respectively located at the bottom of the left and right side plates and the bottom of the rear side plate of the bottom of the first support frame (the three positioning pads are distributed in a triangular shape), and the side edges of the positioning pads are aligned with the center line, so as to ensure that the central axis of the center slide bar and the intersection of the center line are aligned in the vertical direction. Similarly, the base of the second support frame is also provided with a marking line or positioning pad for aligning with the center line of the workbench.

[0052] In one embodiment of the present invention, the lifting and positioning mechanism includes a lifting frame and a lifting drive device, the lifting frame is arranged in the second support frame 13, the lifting drive device is arranged on the second support frame 13 or on the working platform 1 and drives the lifting frame to rise or fall in the vertical direction from the bottom of the lifting frame, the second support frame 13 includes a base 28 and two vertical pillars 29 fixed on the left and right sides of the base 28, the top ends of the two pillars 29 are fixedly connected by a transverse connecting rod, and the lifting frame rises and falls along the pillars 29. The base can be formed by welding and fixing a plurality of square steel pipes, and reinforcing ribs can be provided at necessary positions to ensure stability.

[0053] It should be noted that the limiting mechanism on the lifting frame can ensure that the posture of the water outlet flange on the lifting frame remains unchanged, that is, it remains in a vertical state, and neither sways back and forth and turns over nor rotates in the circumferential direction during the lifting process.

[0054] In an embodiment of the present invention, the lifting frame includes a vertical back plate 30 and two cross bars 31 fixed to the upper and lower parts of the rear side of the back plate 30. The cross bars 31 are located between the two columns 29, and the back plate 30 is located outside the front sides of the two columns 29. The limiting mechanism includes a positioning waist-shaped hole 32 opened in the upper part of the back plate 30 and a supporting plate 33 fixed to the lower part of the front side of the back plate 30. Two positioning screw holes 34 are provided on the supporting plate 33. The lower side of the water outlet flange 14 is pressed against the upper edge of the supporting plate 33, and the back surface of the lower side of the flange is pressed and fitted with the front side of the back plate 30 by bolts threadedly connected to the positioning screw holes 34. Bolts passing through the positioning waist-shaped hole 32 and clamping plates arranged opposite to each other in the front and rear directions press the back surface of the upper side of the water outlet flange 14 against the front side of the back plate 30. An inverted trapezoidal groove facilitating the insertion of the lower edge of the water outlet flange 8 is provided in the upper part of the supporting plate 14.

[0055] It should be noted that for the clamping plates and bolts, those skilled in the art should be able to understand according to the above description. For example, for the bolts threadedly connected to the positioning screw holes on the lower side of the flange, when tightened, the other end can extend upward through a corner of a backing plate (the bolt passes through the backing plate) and press against the front side of the lower side of the water outlet flange.

[0056] In an embodiment of the present invention, the lifting drive device is a jack. The jack is placed on the base 28 and its telescopic end abuts tightly against the cross bar 31 at the lower part of the lifting frame.

[0057] It should be noted that the lifting drive device is used to lift the lifting frame relative to the bracket. It is not necessarily a jack, and can also be a form of cooperation of a motor, a wire winding wheel, a pulling rope, and a fixed pulley, etc., to drive the lifting by retracting and releasing the pulling rope.

[0058] In an embodiment of the present invention, the two ends of the cross bar abut against the inner sides of the two columns. Limiting plates 37 are fixed to the front and rear sides of the columns. The cross bar moves up and down in the limiting groove formed by the two limiting plates 16.

[0059] It can be understood that in order to prevent the lifting frame from swaying or tipping over during lifting, it should be limited. The limiting plates can achieve the above functions, but it is not necessarily achieved through the limiting plates. It can also be to provide sliding grooves on the opposite sides of the two columns. The sliding grooves are for the two ends of the cross bar to extend into. The two ends of the cross bar can move up and down in the sliding grooves, and the cross bar has no freedom in the front and rear directions relative to the sliding grooves.

[0060] In an embodiment of the present invention, the upper part of the positioning fixture 5 has a supporting flat plate 35, and a tightening nut 36 is fixed to the upper part outside the supporting flat plate 35. The central axis of the tightening nut 36 is along the horizontal direction, and a tightening bolt is threadedly connected to the tightening nut 36. When the tightening bolt is tightened, it can press the outer edge end surface of the bottom plate 4.

[0061] A brief description of the usage method of the complete set of welding scribing devices for the water outlet elbow of the pump provided by the present invention is as follows:

[0062] The first support frame is placed on the working platform, and alignment is carried out so that the central axis of the central slide rod is aligned with the intersection point of the center line on the working platform. Place the elbow body with the inlet flange and the bottom plate preliminarily assembled in the area enclosed by the positioning jigs on the working platform, and then turn the tightening bolts. The number of turns of the tightening bolts screwed into each positioning jig is ensured to be basically the same, so as to not only clamp the bottom plate but also align the centers of the bottom plate and the inlet flange with the intersection point of the center line drawn on the working platform in the vertical direction. Then use the liftable scribing needle on the first support frame to scribe the opening line of the packing part on the elbow body (adjust the guide rail to the appropriate height in advance according to the specifications of the elbow body and lock it with the brake pads, and then rotate the scribing rod and the scribing sleeve to scribe). After the opening line is scribed, cutting is carried out. Then use the self-centering three-jaw chuck at the lower end of the central slide rod to clamp the packing gland outer sleeve, insert it into the cut hole, adjust the height and then scribe the intersection line, and then carry out cutting. After completion, assembly and welding are carried out. Finally, use the second support frame to place the outlet flange on the water outlet of the elbow body. After lifting and adjusting to align, welding and assembly are carried out.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A complete set of device for welding and scribing the water outlet elbow of a pump, characterized in that, it includes a working platform (1), a first installation component for scribing the stuffing part and placing and welding the stuffing box outer sleeve, and a second installation component for placing and welding the water outlet flange (14). The first installation component includes a first support frame (2) arranged on the working platform (1) and a plurality of positioning jigs (5) for clamping and positioning the periphery of the circular bottom plate (4) on the elbow body (3). In the middle of the top of the first support frame (2), there is a lifting and positioning mechanism. The lifting and positioning mechanism includes a central slide rod (7) that can be lifted and positioned in the vertical direction. A chuck (8) for clamping the stuffing box outer sleeve is fixed at the lower end of the central slide rod (7). The central slide rod (7) is rotationally connected to a scribing sleeve (9). One end of the scribing sleeve (9) is connected to a scribing rod (10) extending outward. A plurality of scribing holes (11) are arranged at intervals on the scribing rod (10). A scribing needle (12) is selectively inserted into one of the scribing holes (11) and can move up and down in the vertical direction relative to the scribing hole (11). The second installation component includes a second support frame (13) arranged on the working platform (1). A lifting and positioning mechanism for placing the water outlet flange (14) is arranged on the second support frame (13); The lifting and positioning mechanism includes a guide rail (6). The lower end of the guide rail (6) is fixed to the upper end of the central slide rod (7). The guide rail (6) is a circular guide rail. A plurality of sliders (15) that are slidably matched with the circular guide rail are fixed on the first support frame (2) at intervals up and down. A rack (16) is fixed on the installation surface of the circular guide rail. A gear (17) meshing with the rack (16) is connected to a bearing seat (19) fixed on the first support frame (2) through a central shaft (18). One end of the central shaft (18) is fixed with an adjusting handwheel (20). A brake positioning mechanism is also arranged on the first support frame (2). After rotating the adjusting handwheel (20) to move the guide rail (6) up or down a certain distance, the guide rail (6) can be positioned through the brake positioning mechanism; Or, the lifting and positioning mechanism includes a plurality of guide plates (38) fixed on the first support frame (2) at intervals up and down. A flat key (39) extending along the axial direction is arranged on the outer wall of the central slide rod (7). Through holes that are slidably matched with the central slide rod (7) and the flat key (39) are opened on the guide plates (38). A lifting ring (40) is fixed on the upper end surface of the central slide rod (7). The lifting ring (40) is connected to a two-way self-locking hand winch (43) fixed on the first support frame (2) through a steel wire rope (41) passing around several pulleys (42).

2. The complete set of device for welding and scribing the water outlet elbow of a pump according to claim 1, characterized in that, The brake positioning mechanism includes a brake pressure lever (22). There are two bearing seats (19) which are arranged at intervals front and back. The central shaft (18) passes through the two bearing seats (19) and is in interference fit with the inner ring of the bearing in the bearing seat (19). An anti-slip thread (21) is provided on the shaft section of the central shaft (18) between the two bearing seats (19). One end of the brake pressure lever (22) is hinged to a hinge ear (23) fixed on the first support frame (2), and the other end is connected to the first support frame (2) through a locking screw (25). A brake pad (24) is provided on the upper surface of the middle part of the brake pressure lever (22). After the locking screw (25) is screwed in and tightened in place, the brake pad (24) presses against the anti-slip thread (21) to stop and position the central shaft (18).

3. The complete set of welding and marking devices for the water outlet elbow of a pump according to claim 1, characterized in that, the chuck (8) is a three-jaw self-centering chuck. The upper and lower ends of the marking sleeve (9) are respectively abutted against a limit ring. The limit ring is locked and fixed on the central slide rod (7). The marking rod (10) extends in the horizontal direction.

4. The complete set of welding and marking devices for the water outlet elbow of a pump according to claim 1, characterized in that, a cross center line (26) is engraved on the upper surface of the working platform (1). The central axis of the central slide rod (7) is vertically aligned with the intersection point of the center line (26). A plurality of groups of positioning parts (27) are also provided on the working platform (1) and are evenly arranged circumferentially with the intersection point of the center line (26) as the center. Each group of positioning parts (27) includes a plurality of positioning holes with gradually increasing distances from the intersection point of the center line (26) in the radial direction. A positioning fixture (5) is connected to each group of the positioning parts (27).

5. The complete set of welding and marking devices for the water outlet elbow of a pump according to claim 1, characterized in that, the lifting and positioning mechanism includes a lifting frame and a lifting drive device. The lifting frame is arranged in the second support frame (13). The lifting drive device is arranged on the second support frame (13) or the working platform (1) and drives the lifting frame to rise or fall in the vertical direction from the bottom of the lifting frame. The second support frame (13) includes a base (28) and two vertical columns (29) fixed on the left and right sides of the base (28). The tops of the two columns (29) are fixedly connected by a transverse connecting rod. The lifting frame moves up and down along the columns (29).

6. The complete set of welding and marking devices for the water outlet elbow of a pump according to claim 5, characterized in that, The lifting frame includes a vertical backboard (30) and two cross bars (31) fixed to the upper and lower parts of the rear side of the backboard (30). The cross bars (31) are located between the two columns (29), and the backboard (30) is located outside the front sides of the two columns (29). A limiting mechanism is provided on the lifting frame. The limiting mechanism includes a positioning waist-shaped hole (32) opened in the upper part of the backboard (30) and a support plate (33) fixed to the lower part of the front side of the backboard (30). Two positioning screw holes (34) are provided on the support plate (33). The lower side of the water outlet flange (14) is pressed against the upper edge of the support plate (33), and the back side of the lower side of the water outlet flange (14) is pressed and fitted with the front side of the backboard (30) by bolts threadedly connected to the positioning screw holes (34). Bolts passing through the positioning waist-shaped hole (32) and clamping plates arranged opposite to each other in the front and back directions press the back side of the upper side of the water outlet flange (14) against the front side of the backboard (30).

7. The complete set of device for welding and scribing the water outlet elbow of a pump according to claim 6, characterized in that, the lifting drive device is a jack, and the jack is placed on the base (28) and its telescopic end is tightly abutted against the cross bar (31) at the lower part of the lifting frame.

8. The complete set of device for welding and scribing the water outlet elbow of a pump according to any one of claims 1 to 7, characterized in that, the upper part of the positioning fixture (5) has a support flat plate (35), and a tightening nut (36) is fixed to the upper part outside the support flat plate (35). The central axis of the tightening nut (36) is along the horizontal direction, and a tightening bolt is threadedly connected to the tightening nut (36). When the tightening bolt is tightened, it can press the outer edge end face of the bottom plate (4).

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