A welding device for fire pump casing

Abstract

This invention relates to the field of pump casing welding technology, specifically a fire pump casing welding device, comprising a pump casing support mechanism, a pump casing mounted on the support mechanism, an auxiliary welding mechanism mounted within the support mechanism, a welding distance calibration mechanism mounted within the auxiliary welding mechanism, and a welding torch clamped within the welding distance calibration mechanism. The welding distance calibration mechanism includes a support column located in the center of the pump casing cavity, with a base pad fixedly installed at the bottom of the support column. By using expansion bolts to fix the pump casing support mechanism on a workbench, and then pre-assembling and fixing the fire pump casing onto the support mechanism, combined with the calibration and fixation of the welding distance calibration mechanism at the center of the pump casing cavity, the auxiliary welding mechanism supported by the welding distance calibration mechanism drives the welding torch to perform precise angle welding along the inner wall of the pump casing, thereby improving the efficiency of welding irregular arc surfaces inside the pump casing.

Description

Technical Field

[0001] This invention relates to the field of water pump housing welding technology, specifically a fire pump housing welding device. Background Technology

[0002] Fire pumps are widely used in environmental protection, water treatment, and fire protection departments. They are used to pump various liquids and are ideal for creating fire protection systems in civilized workshops and factories that are leak-free and pollution-free. Because the fire pump casing needs to withstand extremely high water pressure, in order to ensure the constant water pressure and safety of the fire protection system, fire pumps need to be repaired and maintained by welding during long-term use to extend the service life of the pump casing.

[0003] Currently, when fire pump casings are used for a long time, their eddy arc surfaces are corroded and cracked due to water pressure. There are significant drawbacks in repairing and maintaining cracked pump casings by welding. Because fire pump casings are heavy, manually controlling the rotation of the casing and welding it with a welding torch can cause the assembled casing to loosen under the centrifugal force of rotation, which in turn affects the effectiveness of the welding.

[0004] In view of this, a fire pump casing welding device was designed to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted in this invention is as follows: A welding device for a fire pump casing includes a pump casing support mechanism, a pump casing mounted on the pump casing support mechanism, an auxiliary welding mechanism mounted within the pump casing support mechanism, a welding distance calibration mechanism mounted within the auxiliary welding mechanism, and a welding torch clamped within the welding distance calibration mechanism. The welding distance calibration mechanism includes a support column located in the middle of the pump casing cavity. A base pad is fixedly installed at the bottom of the support column. Three guide rods are movably installed inside the base pad. Anti-slip pads are fixedly installed at the outer ends of the guide rods. A base support is inserted into the bottom end of the base pad. Three third studs are fixedly installed at the top of the base support, and the three third studs are fixed within the base pad. Three springs are provided between the base pad and the base support, and the springs are pressed against the guide rod; the auxiliary welding mechanism includes a lock head installed on the outside of the support column, a toothed ring is fixedly installed at the bottom of the lock head, a base and a buckle are movably installed on the outside of the lock head, a cantilever is movably installed inside the base, an angle shaft is movably installed at the top of the cantilever, a bracket is fixedly installed on the outside of the angle shaft, a second housing is fixedly installed on the outside of the cantilever, a second motor is fixedly installed inside the second housing, a second gear is installed on the second motor, and a positioning bolt is installed in the internal thread of the bracket; the welding torch is engaged in the bracket.

[0007] In a preferred embodiment, the present invention can be further configured as follows: the pump casing bearing mechanism includes a base, a fixing frame is fixedly installed on the top of the base, two symmetrically distributed first clamps are installed on the outer end of the fixing frame, a first lever arm is movably installed on the first clamp, a connecting shaft is installed on the other end of the first lever arm, a second lever arm is movably installed on the outside of the connecting shaft, and a second clamp is installed on the other end of the second lever arm. Both the first clamp and the second clamp have fan-shaped grooves inside.

[0008] In a preferred embodiment, the present invention may be further configured such that: the auxiliary welding mechanism further includes a hydraulic rod fixedly installed in a fixed frame, a beam frame is fixedly installed on the telescopic end of the hydraulic rod, and a bracket is fixedly installed on the other end of the beam frame; The bottom end of the bracket is fixedly installed inside the lock head.

[0009] In a preferred embodiment, the present invention may be further configured such that: a first housing is fixedly installed on the outer wall of the buckle, a first motor is fixedly installed inside the first housing, a first gear is installed on the first motor, and the first gear is adapted to mesh with a gear ring.

[0010] In a preferred embodiment, the present invention may be further configured such that: two first studs are fixedly installed on the base in a symmetrical manner, and the two first studs are fixedly installed in the buckle.

[0011] In a preferred embodiment, the present invention can be further configured such that: the base has two plate segments away from the buckle with sliding grooves, and the inner sides of the two plate segments are fixedly installed with compression springs adapted to bear pressure on the cantilever, and the bottom end of the cantilever is inserted with a slider, and the slider is adapted to penetrate into the sliding groove inside the plate segment.

[0012] In a preferred embodiment, the present invention may be further configured such that: a preload bolt is threadedly installed at the bottom end of the cantilever, a pressure plate is provided on the outside of the preload bolt, and an anti-slip pad is fixedly installed at the bottom of the pressure plate.

[0013] In a preferred embodiment, the present invention can be further configured such that: the inner side of the card holder is provided with an inclined groove, and the barrel of the welding gun is adapted to be engaged in the inclined groove, and the positioning bolt is used to adapt to and tighten the barrel of the welding gun.

[0014] In a preferred embodiment, the present invention can be further configured as follows: a vertical groove is provided inside the support column, and a sliding pad is movably installed in the vertical groove; three traction rods are movably installed on the sliding pad; a locking buckle is movably installed at the other end of the traction rod, and the locking buckle is fixedly installed on the rod section of the guide rod; and a screw hole is provided inside the sliding pad.

[0015] In a preferred embodiment, the present invention can be further configured as follows: a top plate is installed at the top of the support column, four evenly distributed second studs are fixedly installed inside the top plate, a hexagonal end is fixedly installed in the middle of the top plate, and the four second studs are fixedly installed inside the support column. A bidirectional screw is threaded into the hexagonal end and extends into the support column, and the threaded section of the bidirectional screw is adapted to extend into the screw hole in the middle of the sliding pad.

[0016] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows: 1. This invention uses expansion bolts to fix the pump casing support mechanism on the workbench, and then pre-assembles and fixes the fire pump casing on the pump casing support mechanism. Combined with the calibration and fixation of the welding distance calibration mechanism at the center of the pump casing cavity, the auxiliary welding mechanism supported by the welding distance calibration mechanism will drive the welding torch to perform precise angle welding along the inner wall of the pump casing, thereby improving the efficiency of welding the irregular arc surface inside the pump casing.

[0017] 2. This invention adds an external image acquisition module to the auxiliary welding mechanism. With the help of the image acquisition module, the defect area of ​​the pump casing inner wall can be detected in real time. The welding torch of the auxiliary welding mechanism can be adjusted in real time and rotated in a circle to automatically perform casting welding on the inner wall of the pump casing. This avoids the problem of shaking of the splicing parts due to centrifugal force caused by the passive rotation of the pump casing.

[0018] 3. This invention installs the welding torch inside the holder, and movably installs the holder and cantilever in the sliding groove inside the base. By controlling the distance between the cantilever and the base, and by using a second motor to control the tilting angle of the angular shaft and the holder, the U-shaped inner wall of the pump casing can be fully fluxed. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the use of the present invention; Figure 2 This is a three-dimensional schematic diagram of the present invention; Figure 3 This is an exploded view of the pump casing support mechanism of the present invention; Figure 4 This is a schematic diagram of the welding distance calibration mechanism of the present invention; Figure 5 For the present invention Figure 4 An explosion diagram; Figure 6 This is a schematic diagram of the auxiliary welding mechanism of the present invention; Figure 7 This is an exploded view of the auxiliary welding mechanism of the present invention; Figure 8 For the present invention Figure 7 An explosion diagram.

[0020] Figure label: 100. Pump casing bearing mechanism; 110. Base; 120. Fixing frame; 130. First clamp; 140. Second clamp; 150. First lever arm; 1501. Second lever arm; 1502. Connecting shaft; 200. Pump casing; 300. Auxiliary welding mechanism; 310. Hydraulic rod; 320. Beam frame; 3201. Bracket; 330. Lock head; 3301. Gear ring; 340. Base; 3401. First stud; 3402. Buckle; 3403. Compression spring; 350. First housing; 3501. First motor; 3502. First gear; 360. Cantilever; 3601. Second housing; 3602. Second motor; 3603. Second gear; 3604. Slider; 3605. Pressure plate; 3606. Preload bolt; 370. Angle shaft; 3701. Card holder; 3702. Positioning bolt; 400. Welding distance calibration mechanism; 410. Support column; 4101. Top plate; 4102. Hexagonal end; 4103. Second stud; 420. Double-acting lead screw; 430. Sliding pad; 4301. Traction rod; 4302. Lock; 440. Bottom pad; 4401. Bottom support; 4402. Third stud; 450. Guide rod; 4501. Anti-slip pad; 4502. Spring; 500. Welding torch. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0022] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0023] The following describes, with reference to the accompanying drawings, some embodiments of a fire pump housing welding device provided by the present invention. Example 1:

[0024] Combination Figures 1 to 8As shown, the present invention provides a fire pump casing welding device, including a pump casing support mechanism 100, a pump casing 200 mounted on the pump casing support mechanism 100, an auxiliary welding mechanism 300 mounted inside the pump casing support mechanism 100, a welding distance calibration mechanism 400 mounted inside the auxiliary welding mechanism 300, and a welding torch 500 clamped inside the welding distance calibration mechanism 400. The pump casing support mechanism 100 supports the pump casing 200 and provides a suspension platform for the auxiliary welding mechanism 300. The auxiliary welding mechanism 300 supports the welding distance calibration mechanism 400 and controls the free lifting and lowering of the welding distance calibration mechanism 400 along the inner cavity of the pump casing 200. The welding distance calibration mechanism 400 clamps the welding torch 500 and cooperates with the welding torch 500 to perform circumferential welding on the inner wall of the pump casing 200.

[0025] The pump casing support mechanism 100 includes a base 110, a fixing frame 120 fixedly installed on the top of the base 110, two symmetrically distributed first clamps 130 installed on the outer end of the fixing frame 120, a first lever arm 150 movably installed on the first clamp 130, a connecting shaft 1502 installed on the other end of the first lever arm 150, a second lever arm 1501 movably installed on the outside of the connecting shaft 1502, and a second clamp 140 installed on the other end of the second lever arm 1501. Both the first clamp 130 and the second clamp 140 have fan-shaped grooves inside; The welding distance calibration mechanism 400 includes a support column 410 located in the middle of the inner cavity of the pump housing 200. A base pad 440 is fixedly installed at the bottom of the support column 410. Three guide rods 450 are movably installed inside the base pad 440. An anti-slip pad 4501 is fixedly installed at the outer end of the guide rods 450. A base support 4401 is inserted into the bottom end of the base pad 440. Three third studs 4402 are fixedly installed at the top of the base support 4401 and are fixed inside the base pad 440. Three springs 4502 are provided between the base pad 440 and the base support 4401, and the springs 4502 are pressed against the guide rods 450. The auxiliary welding mechanism 300 includes a lock head 330 installed on the outside of the support column 410. A toothed ring 3301 is fixedly installed at the bottom of the lock head 330. A base 340 and a buckle 3402 are movably installed on the outside of the lock head 330. A cantilever 360 is movably installed inside the base 340. An angle shaft 370 is movably installed at the top of the cantilever 360. A bracket 3701 is fixedly installed on the outside of the angle shaft 370. A second housing 3601 is fixedly installed on the outside of the cantilever 360. A second motor 3602 is fixedly installed inside the second housing 3601. A second gear 3603 is installed on the second motor 3602. A positioning bolt 3702 is threaded on the bracket 3701. The welding torch 500 is snapped into the holder 3701. The holder 3701 has an inclined groove on its inner side, and the barrel of the welding torch 500 is fitted into the inclined groove. The positioning bolt 3702 is used to fit and tighten the barrel of the welding torch 500.

[0026] The base 110 is fixed to the workbench by multiple expansion bolts. Then, the two second clamps 140 are stretched. With the linkage of the two sets of second lever arms 1501, connecting shaft 1502 and first lever arm 150, the two evenly distributed second clamps 140 and two first clamps 130 will provide a stable support platform for the bottom of the pump housing 200. Once the bottom of the pump casing 200 is effectively fixed and under load, the hydraulic rod 310 is operated until the telescopic end of the hydraulic rod 310 drives the beam frame 320 and the bracket 3201 to rise and fall relative to each other along the inner cavity of the pump casing 200 until the lock head 330 and the support column 410 are inserted along the middle of the inner cavity of the pump casing 200. As the three evenly distributed guide rods 450 and the anti-slip pads 4501 enter the inner cavity of the bottom pipe section of the pump casing 200, the double-acting screw 420 is rotated until the sliding pad 430 descends along the threaded section of the double-acting screw 420. The sliding pad 430 will push the three traction rods 4301 and the three guide rods 450 to extend outward quickly. Finally, the three anti-slip pads 4501 can be effectively fixed on the inner wall of the pump casing 200, and the support column 410 will be located at the center of the inner cavity of the pump casing 200. Then, the second motor 3602 is activated. As the transmission shaft inside the second motor 3602, in conjunction with the second gear 3603, drives the angle shaft 370, the angle shaft 370 will cause the card holder 3701 to tilt and tilt. The welding torch 500, which is fixed in the inclined groove inside the card holder 3701 by the positioning bolt 3702, can be tilted. Finally, the downward tilted nozzle of the welding torch 500 will quickly align with the cracked area of ​​the inner wall of the pump housing 200. As the base 340 and the buckle 3402 rotate at a constant speed and in a circular motion along the lock head 330, the tilted welding torch 500 can then work with the image acquisition module to perform precise and efficient flux welding on the inner wall of the pump housing 200. Example 2:

[0027] Combination Figures 3 to 8 As shown, based on Embodiment 1, the auxiliary welding mechanism 300 further includes a hydraulic rod 310 fixedly installed in the fixed frame 120, a beam frame 320 fixedly installed on the telescopic end of the hydraulic rod 310, and a bracket 3201 fixedly installed on the other end of the beam frame 320. The bottom of bracket 3201 is fixedly installed inside lock head 330.

[0028] Preferably, the lock head 330 has an annular groove on its outside, and a bearing is installed in the annular groove. When the base 340 and the buckle 3402 are fixed by two first studs 3401, the inner walls of the base 340 and the buckle 3402 will be pressed against the outer ring of the bearing.

[0029] The outer wall of the buckle 3402 is fixedly installed with a first housing 350, and the first motor 3501 is fixedly installed inside the first housing 350. The first gear 3502 is installed on the first motor 3501 and is adapted to mesh with the gear ring 3301.

[0030] Two symmetrically distributed first studs 3401 are fixedly installed on the base 340, and the two first studs 3401 are fixedly installed in the buckle 3402. The base 340 has two plate segments away from the buckle 3402 with sliding grooves. The inner side of the two plate segments is fixedly installed with compression springs 3403 adapted to bear pressure on the cantilever 360. The bottom end of the cantilever 360 is inserted with a slider 3604, and the slider 3604 is adapted to pass through the sliding groove inside the plate segment. The bottom end of the cantilever 360 is threaded with a preload bolt 3606, and a pressure plate 3605 is provided on the outside of the preload bolt 3606. An anti-slip pad is fixedly installed on the bottom of the pressure plate 3605.

[0031] Preferably, the two plates inside the first housing 350 are welded to the outer wall of the buckle 3402. When the first motor 3501 starts and runs, the first gear 3502 installed on the transmission shaft inside the first motor 3501 will rotate circumferentially along the gear ring 3301. The combined base 340 and buckle 3402 will rotate at a constant speed along the annular groove of the lock head 330 under the bearing support. At this time, the welding gun 500, which is fixed and angled by the buckle 3701 and the positioning bolt 3702, can perform precise welding along the arc surface inside the pump housing 200, further improving the integrity and aesthetics of the weld. Example 3:

[0032] Combination Figure 4 and Figure 5 As shown, in the above embodiment, the support column 410 has a vertical groove inside, and a sliding pad 430 is movably installed in the vertical groove. Three traction rods 4301 are movably installed on the sliding pad 430. A latch 4302 is movably installed at the other end of the traction rod 4301, and the latch 4302 is fixedly installed on the rod section of the guide rod 450. A screw hole is opened inside the sliding pad 430.

[0033] Preferably, the support column 410 is welded inside the base pad 440, and the bottom of the base pad 440 and the top of the base support 4401 are provided with three symmetrically distributed semi-cylindrical holes. One end of the spring 4502 is pressed against the inner wall of the semi-cylindrical hole, and the other end of the spring 4502 is pressed against the inner end of the guide rod 450. Furthermore, the guide rod 450 is welded together from a T-shaped rod segment and a rectangular clip, while the outer surface of the anti-slip pad 4501 is provided with a matrix of horizontal grooves.

[0034] A top plate 4101 is installed at the top of the support column 410. Four evenly distributed second studs 4103 are fixedly installed inside the top plate 4101. A hexagonal end 4102 is fixedly installed in the middle of the top plate 4101. The four second studs 4103 are fixedly installed inside the support column 410. A bidirectional screw 420 is threaded into the hexagonal end 4102 and extends into the support column 410. The threaded section of the bidirectional screw 420 is adapted to pass through the screw hole in the middle of the sliding pad 430.

[0035] Preferably, the top plate 4101 is pressed against the top of the support column 410 by an anti-slip pad, and four second studs 4103 inserted into the support column 410 are fixed by four nuts. The top of the bidirectional lead screw 420 is fixedly equipped with a rotating wheel, and the bottom section of the bidirectional lead screw 420 is adapted to be inserted into the inside of the support column 410. As the rotating wheel at the top of the bidirectional lead screw 420 is rotated, the sliding pad 430 will smoothly rise and fall along the threaded section of the bidirectional lead screw 420. The three traction rods 4301, which are movably installed on the sliding pad 430, together with the three locking buckles 4302, will push the three guide rods 450 to extend and retract relative to each other. At this time, the device can adapt to the inner cavity of pump housing 200 of different sizes, and finally realize the calibration and fixation of the support column 410 with the pump housing 200 as the center, ensuring the effectiveness of the welding torch 500 tilting rotation welding.

[0036] The working principle and usage process of the present invention are as follows: The base 110 is fixedly installed on the working platform in advance using expansion bolts. Then, the two second clamps 140 are expanded outward until the two first clamps 130 and the two second clamps 140 are expanded to their maximum state. Then, the pump housing 200 is installed in the two first clamps 130 and the two second clamps 140 until the pump housing 200 is effectively supported. Next, the hydraulic rod 310 is operated until the telescopic end of the hydraulic rod 310 drives the beam 320 and the bracket 3201 to descend. When the lower surface of the base 4401 is level with the bottom port of the pump housing 200, the double-acting screw 420 is rotated until the sliding pad 430 descends along the threaded section of the double-acting screw 420. The sliding pad 430 will push the three traction rods 4301 to extend synchronously, and the bottom end of the traction rod 4301 will push the lock 4302 to move outward laterally. The three evenly distributed guide rods 450 and the three anti-slip pads 4501 will effectively press against the inner wall of the pump housing 200 until the support column 410 is stabilized and fixed at the center of the inner cavity of the pump housing 200. Then, use a wrench to adjust the pre-tightening bolt 3606. After the pressure plate 3605 and the upper surface of the base 340 are loosened, push the cantilever 360 to move outward along the inner groove of the base 340 until the nozzle of the welding gun 500 installed in the card holder 3701 approaches the part to be welded on the inner wall of the pump housing 200. After the distance between the bottom nozzle of the welding gun 500 and the inner wall of the pump housing 200 is adjusted and matched, use a wrench to tighten the pre-tightening bolt 3606. When the second motor 3602 starts and runs, its internal transmission shaft, in conjunction with the second gear 3603, drives the angle shaft 370 to rotate. The bracket 3701, fixedly installed outside the angle shaft 370, adjusts the angle between the bottom nozzle of the welding torch 500 and the inner wall of the pump housing 200 until the bottom nozzle of the welding torch 500 is precisely matched with the part to be welded on the inner wall of the pump housing 200. As the first motor 3501 runs, it drives the first gear 3502, which rotates circumferentially along the gear ring 3301. Finally, the first housing 350 drives the combined buckle 3402 and the base 340 to rotate at a constant speed along the outside of the lock head 330. The welding torch 500, after the angle adjustment, can then perform precise welding on the part to be welded on the inner wall of the pump housing 200. At this time, the arc surface of the inner wall of the pump housing 200 can be quickly and accurately welded.

[0037] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A welding device for a fire pump casing, comprising a pump casing support mechanism (100), characterized in that, It also includes a pump housing (200) mounted on the pump housing support mechanism (100), an auxiliary welding mechanism (300) mounted in the pump housing support mechanism (100), a welding distance calibration mechanism (400) mounted in the auxiliary welding mechanism (300), and a welding torch (500) clamped in the welding distance calibration mechanism (400). The welding distance calibration mechanism (400) includes a support column (410) located in the middle of the inner cavity of the pump housing (200). A base pad (440) is fixedly installed at the bottom of the support column (410). Three guide rods (450) are movably installed inside the base pad (440). An anti-slip pad (4501) is fixedly installed at the outer end of the guide rod (450). A base support (4401) is inserted into the bottom end of the base pad (440). Three third studs (4402) are fixedly installed at the top of the base support (4401). The three third studs (4402) are fixed inside the base pad (440). Three springs (4502) are provided between the base pad (440) and the base support (4401). The springs (4502) are pressed against the guide rods (450). The auxiliary welding mechanism (300) includes a lock head (330) installed outside the support column (410). A toothed ring (3301) is fixedly installed at the bottom of the lock head (330). A base (340) and a buckle (3402) are movably installed outside the lock head (330). A cantilever (360) is movably installed inside the base (340). An angle shaft (370) is movably installed at the top of the cantilever (360). A bracket (3701) is fixedly installed outside the angle shaft (370). A second housing (3601) is fixedly installed outside the cantilever (360). A second motor (3602) is fixedly installed inside the second housing (3601). A second gear (3603) is installed on the second motor (3602). A positioning bolt (3702) is threaded inside the bracket (3701). The welding torch (500) is snapped into the holder (3701); The pump casing support mechanism (100) includes a base (110), a fixing frame (120) is fixedly installed on the top of the base (110), two symmetrically distributed first clamps (130) are installed on the outer end of the fixing frame (120), a first lever arm (150) is movably installed on the first clamp (130), a connecting shaft (1502) is installed on the other end of the first lever arm (150), a second lever arm (1501) is movably installed on the outside of the connecting shaft (1502), and a second clamp (140) is installed on the other end of the second lever arm (1501). Both the first clamp (130) and the second clamp (140) have fan-shaped grooves inside.

2. The fire pump casing welding device according to claim 1, characterized in that, The auxiliary welding mechanism (300) also includes a hydraulic rod (310) fixedly installed in the fixed frame (120), a beam frame (320) fixedly installed on the telescopic end of the hydraulic rod (310), and a bracket (3201) fixedly installed on the other end of the beam frame (320). The bottom end of the bracket (3201) is fixedly installed inside the lock head (330).

3. The fire pump casing welding device according to claim 1, characterized in that, The outer wall of the buckle (3402) is fixedly installed with a first housing (350), and the first motor (3501) is fixedly installed inside the first housing (350). The first gear (3502) is installed on the first motor (3501), and the first gear (3502) is adapted to mesh with the gear ring (3301).

4. The fire pump casing welding device according to claim 1, characterized in that, Two first studs (3401) are fixedly installed on the base (340), and the two first studs (3401) are fixedly installed in the buckle (3402).

5. The fire pump casing welding device according to claim 1, characterized in that, The base (340) has two plate segments away from the buckle (3402) with sliding grooves, and the inner sides of the two plate segments are fixedly installed with compression springs (3403) adapted to bear pressure on the cantilever (360). The bottom end of the cantilever (360) is inserted with a slider (3604), and the slider (3604) is adapted to penetrate into the sliding groove inside the plate segment.

6. The fire pump casing welding device according to claim 1, characterized in that, The bottom end of the cantilever (360) is threaded with a preload bolt (3606), and a pressure plate (3605) is provided on the outside of the preload bolt (3606), and an anti-slip pad is fixedly installed on the bottom of the pressure plate (3605).

7. The fire pump casing welding device according to claim 1, characterized in that, The inner side of the card holder (3701) is provided with an inclined groove, and the barrel of the welding gun (500) is adapted to be engaged in the inclined groove. The positioning bolt (3702) is used to adapt to and tighten the barrel of the welding gun (500).

8. The fire pump casing welding device according to claim 1, characterized in that, The support column (410) has a vertical groove inside, and a sliding pad (430) is movably installed in the vertical groove. Three traction rods (4301) are movably installed on the sliding pad (430). A latch (4302) is movably installed at the other end of the traction rod (4301), and the latch (4302) is fixedly installed on the rod section of the guide rod (450). A screw hole is opened inside the sliding pad (430).

9. A fire pump casing welding device according to claim 1, characterized in that, The top of the support column (410) is equipped with a top plate (4101), and four evenly distributed second studs (4103) are fixedly installed inside the top plate (4101). A hexagonal end (4102) is fixedly installed in the middle of the top plate (4101), and the four second studs (4103) are fixedly installed inside the support column (410). A double-ended screw (420) is threaded inside the hexagonal end (4102) and penetrates into the inside of the support column (410). The threaded section of the double-ended screw (420) is adapted to penetrate into the screw hole in the middle of the sliding pad (430).

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