Splicing equipment for clean pipeline and splicing method thereof

Abstract

The splicing equipment for cleaning the pipeline comprises a base, the upper end of the base is fixedly connected with a vertical plate, and the upper end of the vertical plate is fixedly connected with a top plate; the positioning and mounting mechanism comprises two mounting plates which are symmetrically and fixedly connected to the upper end of the base, mounting cylinders are horizontally arranged on the two mounting plates in a penetrating mode, each mounting cylinder is rotationally connected with the corresponding mounting plate through a bearing, and electric telescopic rods are mounted on the upper side and the lower side of each mounting cylinder; the telescopic end of each electric telescopic rod is fixedly connected with an arc-shaped clamping plate, and the inner side of each arc-shaped clamping plate is provided with a rubber layer. The invention further discloses a clean pipeline splicing method. In the actual using process, the splicing quality can be effectively improved, and in the welding process, welding smoke can be effectively removed, so that the influence on the surrounding environment is avoided.

Description

Technical Field

[0001] The invention relates to the field of pipeline connection, and in particular to a splicing device for clean pipelines and a splicing method thereof. Background Art

[0002] With the development of modern industry, clean pipes are increasingly used in advanced fields such as electronics, medical treatment, food and pharmaceuticals. The main function of clean pipes is to ensure the cleanliness of air, water and other fluids, thereby improving product quality. In the production process of clean pipes, welding and splicing is a crucial link;

[0003] The traditional pipe welding and splicing method often requires a lot of time and energy to adjust during docking, and it is difficult to ensure the accuracy and stability of the docking. At the same time, during welding, dust and some oxide films are easily accumulated at the pipe joints, which in turn affects the welding quality. What is more serious is that the smoke generated during the welding process will not only pollute the environment, but also pose a threat to the health of operators. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a splicing device for clean pipes. During actual use, the device can effectively improve the quality of splicing and effectively remove welding fumes during welding to avoid affecting the surrounding environment.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A splicing device for clean pipes comprises a base, the upper end of the base is fixedly connected to a vertical plate, and the upper end of the vertical plate is fixedly connected to a top plate; a positioning and mounting mechanism, the positioning and mounting mechanism comprises two mounting plates symmetrically fixedly connected to the upper end of the base, both mounting plates are horizontally penetrated by a mounting cylinder, each of the mounting cylinder is rotatably connected to the corresponding mounting plate through a bearing, an electric telescopic rod is installed on the upper and lower sides of each mounting cylinder, the telescopic end of each electric telescopic rod is fixedly connected to an arc-shaped clamping plate, and a rubber layer is provided on the inner side of each arc-shaped clamping plate; a welding mechanism, the welding mechanism comprises a connecting plate arranged below the vertical plate, and a welding head is installed at the lower end of the connecting plate; a lifting mechanism, the lifting mechanism is used to lift the welding head to realize the welding connection operation; a grinding mechanism, the grinding mechanism is installed above the base, and is used to grind the welding part to be welded to improve the welding strength.

[0007] Preferably, the lifting mechanism comprises a hydraulic telescopic rod installed on the upper end of the top plate, the telescopic end of the hydraulic telescopic rod passes through the top plate and is fixedly connected to the upper end of the connecting plate.

[0008] Preferably, two guide rods are symmetrically fixedly connected to the upper end of the connecting plate, and the upper ends of the two guide rods both penetrate the top plate and are slidably connected.

[0009] Preferably, the grinding mechanism includes a mounting frame installed on the right side of the base, a driving motor is installed on the mounting frame, the output shaft of the driving motor passes through two mounting plates in sequence, a rotating disk is provided through the middle of the output shaft of the driving motor, the output shaft of the driving motor is fixedly connected to the rotating disk, a plurality of sliding grooves are provided on the outer side of the rotating disk, a slidable moving block is provided in each of the sliding grooves, a side of each of the moving blocks close to the output shaft of the driving motor is elastically connected to the inner wall of the corresponding sliding groove through a spring, the other side of each of the moving blocks is fixedly connected to a connecting block, and the other side of each of the connecting blocks is fixedly connected to a grinding head.

[0010] Preferably, a first gear is mounted on each of the two mounting cylinders, two second gears are mounted on the output shaft of the drive motor, and each of the first gears is meshed with a corresponding second gear.

[0011] Preferably, a water storage chamber is provided in the base, a drain port is provided on the rear side of the inner bottom space of the water storage chamber, a sealing plug is installed in the drain port, a fixing rod is fixedly connected to the rear side of the vertical plate, an arc-shaped hollow bar is fixedly connected to the front side of the fixing rod, a plurality of air holes are provided on the inner side of the arc-shaped hollow bar, the arc-shaped hollow bar is connected to the inner bottom space of the water storage chamber through a first connecting pipe, an installation groove is provided on the front side of the base, a filter box is installed in the installation groove, an activated carbon block is installed inside the filter box, and the right side space of the filter box and the top space of the water storage chamber are connected through a second connecting pipe.

[0012] Preferably, a water storage chamber is provided in the base, a drain port is provided on the rear side of the inner bottom space of the water storage chamber, a sealing plug is installed in the drain port, a fixing rod is fixedly connected to the rear side of the vertical plate, an arc-shaped hollow bar is fixedly connected to the front side of the fixing rod, a plurality of air holes are provided on the inner side of the arc-shaped hollow bar, the arc-shaped hollow bar is connected to the inner bottom space of the water storage chamber through a first connecting pipe, an installation groove is provided on the front side of the base, a filter box is installed in the installation groove, an activated carbon block is installed inside the filter box, and the right side space of the filter box and the top space of the water storage chamber are connected through a second connecting pipe.

[0013] Preferably, a second one-way valve is installed inside the first one-way tube, and a first one-way valve is installed inside the second one-way tube. The flow direction of the second one-way valve is that the filter box flows in one direction into the bottom space of the piston cylinder, and the flow direction of the one-way valve inside the first one-way valve is that the bottom space of the piston cylinder flows in one direction into the arc-shaped hollow bar.

[0014] A method for splicing clean pipes, using the above-mentioned splicing equipment, comprises the following steps:

[0015] Step 1: insert the two pipe bodies to be spliced ​​into the two installation tubes, open the sealing cover, and supply water into the water storage chamber. The height of the water body is not higher than the connection point between the second connecting pipe and the water storage chamber;

[0016] Step 2: Drive the electric telescopic rod to extend, drive the arc-shaped clamping plate to clamp the pipe, and then start the drive motor to run;

[0017] Step 3: Start the extension of the hydraulic telescopic rod, drive the welding head to a suitable position through the connecting plate and the guide rod, and perform welding operations. During the welding process, the drive motor can also be started;

[0018] Step 4: After welding is completed, turn off the welding of the welding head and let the drive motor continue to start for a period of time. During this period of time, the circulating gas flow generated can cool the welding point of the pipe fitting to facilitate subsequent processing.

[0019] Step 5: Finally, turn off the drive motor, then start the multiple electric telescopic rods to retract, and finally remove the spliced ​​pipe fittings.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention can stably clamp the pipe by designing an electric telescopic rod and an arc-shaped clamping plate structure, and enhances the clamping stability and pipe protection through the rubber layer, effectively avoiding displacement or damage of the pipe during grinding and welding, and improving work efficiency and processing quality.

[0022] 2. The drive motor drives the rotating disk and the moving block structure, and uses the elastic effect and centrifugal force of the spring to achieve uniform grinding of the grinding head close to the pipe surface, effectively removing the dirt and oxide layer on the pipe surface, and further improving the welding quality. At the same time, the drive motor also drives the installation cylinder to rotate through gear transmission, achieving comprehensive grinding of the contact surfaces of the two pipe bodies, ensuring the flatness and sealing of the welding joint.

[0023] 3. During the grinding and welding process, the piston plate is driven to move up and down in the piston cylinder by the turntable and connecting rod structure. The one-way valve is used to realize the one-way gas flow from the top space of the water storage chamber to the inside of the filter box, as well as the one-way gas flow between the arc hollow bar, the first connecting pipe and the water storage chamber. The dust generated by grinding and the high-temperature fume generated by welding are effectively drawn into the water body for centralized collection and cooling treatment, avoiding the diffusion of dust and exhaust gas and protecting the surrounding environment and the health of operators.

[0024] 4. After welding is completed, the welding of the welding head 7 is turned off, and the driving motor 13 is allowed to continue to start for a period of time. During this period of time, the circulating gas flow generated can cool the welding part of the pipe fitting, which is convenient for subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a splicing device for clean pipes proposed by the present invention;

[0026] Figure 2 for Figure 1 A magnified schematic diagram of point A;

[0027] Figure 3 This is a schematic diagram of the right side of one of the installation cylinders;

[0028] Figure 4 It is an enlarged schematic diagram of the piston cylinder part;

[0029] Figure 5 It is a side view schematic diagram of the arc hollow bar connected to the fixed rod.

[0030] In the figure: 1 base, 2 vertical plate, 3 top plate, 4 hydraulic telescopic rod, 5 connecting plate, 6 guide rod, 7 welding head, 8 mounting plate, 9 mounting cylinder, 10 first gear, 11 rotating shaft, 12 mounting frame, 13 driving motor, 14 water storage chamber, 15 first connecting pipe, 16 drainage port, 17 mounting groove, 18 filter box, 19 activated carbon block, 20 piston cylinder, 21 arc hollow bar, 22 air hole, 23 second one-way pipe, 24 rotating disk, 25 slide groove, 26 spring, 27 moving block, 28 connecting block, 29 grinding head, 30 electric telescopic rod, 31 arc splint, 32 rubber layer, 33 connecting rod, 34 rotating disk, 35 piston plate, 36 second connecting pipe, 37 first one-way pipe, 38 first one-way valve, 39 second one-way valve, 40 fixing rod. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Reference Figure 1-5 , a splicing device for clean pipes, comprising a base 1, a vertical plate 2 is fixedly connected to the upper end of the base 1, and a top plate 3 is fixedly connected to the upper end of the vertical plate 2;

[0034] As an embodiment of the present invention, it also includes a positioning and mounting mechanism, which includes two mounting plates 8 symmetrically fixedly connected to the upper end of the base 1, and the two mounting plates 8 are horizontally penetrated with mounting tubes 9, each mounting tube 9 is rotatably connected to the corresponding mounting plate 8 through a bearing, and the upper and lower sides of each mounting tube 9 are installed with electric telescopic rods 30. It should be noted that batteries are installed on the two mounting tubes 9 for powering the electric telescopic rods 30, and the telescopic ends of each electric telescopic rod 30 are fixedly connected with arc-shaped clamping plates 31, and the inner side of each arc-shaped clamping plate 31 is provided with a rubber layer 32;

[0035] As an embodiment of the present invention, a welding mechanism is further included, the welding mechanism includes a connecting plate 5 arranged below the vertical plate 2, a welding head 7 is installed at the lower end of the connecting plate 5, and a welding operation can be achieved through the welding head 7;

[0036] As an embodiment of the present invention, it also includes a lifting mechanism, which is used to lift the welding head 7 to achieve the welding connection operation. The lifting mechanism includes a hydraulic telescopic rod 4 installed on the upper end of the top plate 3. The telescopic end of the hydraulic telescopic rod 4 penetrates the top plate 3 and is fixedly connected to the upper end of the connecting plate 5. The upper end of the connecting plate 5 is symmetrically fixedly connected to two guide rods 6. The upper ends of the two guide rods 6 penetrate the top plate 3 and are slidably connected. The lifting of the connecting plate 5 can be achieved by starting the hydraulic telescopic rod 4.

[0037] As an embodiment of the present invention, it also includes a grinding mechanism, which is installed above the base 1 and is used to grind the weld to be welded to improve the welding strength. The grinding mechanism includes a mounting frame 12 installed on the right side of the base 1, and a driving motor 13 is installed on the mounting frame 12. The output shaft of the driving motor 13 passes through the two mounting plates 8 in sequence, and a rotating disk 24 is provided in the middle of the output shaft of the driving motor 13. The output shaft of the driving motor 13 is fixedly connected to the rotating disk 24. A plurality of slide grooves 25 are provided on the outer side of the rotating disk 24, and a slidable moving block 27 is provided in each slide groove 25. The side of each moving block 27 close to the output shaft of the driving motor 13 is elastically connected to the inner wall of the corresponding slide groove 25 through a spring 26, and the other side of each moving block 27 is fixedly connected to a connecting block 28, and the other side of each connecting block 28 is fixedly connected to a grinding head 29. The first gear 10 is installed on the two mounting cylinders 9, and two second gears are installed on the output shaft of the driving motor 13, and each first gear 10 is meshed with the corresponding second gear.

[0038] As an embodiment of the present invention, a water storage chamber 14 is provided in the base 1, a water inlet is provided on the front side of the inner top of the water storage chamber 14, a sealing cover is installed at the water inlet, a drain port 16 is provided on the rear side of the inner bottom space of the water storage chamber 14, a sealing plug is installed in the drain port 16, a fixing rod 40 is fixedly connected to the rear side of the vertical plate 2, an arc-shaped hollow bar 21 is fixedly connected to the front side of the fixing rod 40, a plurality of air holes 22 are provided on the inner side of the arc-shaped hollow bar 21, the arc-shaped hollow bar 21 is connected to the inner bottom space of the water storage chamber 14 through a first connecting pipe 15, an installation groove 17 is provided on the front side of the base 1, a filter box 18 is installed on the installation groove 17, an activated carbon block 19 is installed inside the filter box 18, the right side space of the filter box 18 and the top space of the water storage chamber 14 are connected through a second connecting pipe 36, and the left side of the base 1 A piston cylinder 20 is installed, and a piston plate 35 that can slide up and down is arranged in the piston cylinder 20. The inner bottom space of the piston cylinder 20 is connected with the left side space of the filter box 18 through a first one-way tube 37, and the inner bottom space of the piston cylinder 20 is connected with the inner side of the arc-shaped hollow bar 21 through a second one-way tube 23. The output shaft of the drive motor 13 is fixedly connected with a turntable 34, and a connecting rod 33 is rotatably connected at the left eccentric part of the turntable 34. The other end of the connecting rod 33 is fixedly connected with the upper end of the piston plate 35. A second one-way valve 39 is installed inside the first one-way tube 37, and a first one-way valve 38 is installed inside the second one-way tube 23. The flow direction of the second one-way valve 39 is that the filter box 18 enters the bottom space of the piston cylinder 20 in one direction, and the one-way valve inside the first one-way valve 38 flows in the bottom space of the piston cylinder 20 in one direction into the arc-shaped hollow bar 21.

[0039] In the present invention, when the equipment is working, two pipe bodies to be spliced ​​are inserted into two installation tubes 9, the sealing cover is opened, and water is supplied to the water storage chamber 14. The height of the water body is not higher than the connection point between the second connecting pipe 36 and the water storage chamber 14. Then, the electric telescopic rod 30 is driven to extend, driving the arc clamping plate 31 to clamp the pipe, and the rubber layer 32 enhances the clamping stability and pipe protection. Subsequently, the driving motor 13 is started to operate, and its output shaft drives the rotating disk 24 to rotate. Due to the elastic effect of the spring 26 and the centrifugal force, the moving block 27 slides in the slide groove 25, so that the grinding head 29 is close to the surface of the pipe for uniform grinding, and the dirt and the oxidized grinding layer on it are polished off to improve the welding quality. At the same time, the output shaft of the driving motor 13 also drives the first gear 10 through the second gear, driving the installation tube 9 to rotate, so as to achieve comprehensive grinding of the contact surfaces of the two pipe bodies.

[0040] During the grinding process, when the driving motor 13 is running, the turntable 34 drives the piston plate 35 to move up and down in the piston cylinder 20 through the connecting rod 33. Through the action of the first one-way valve 38 and the second one-way valve 39, a one-way gas flow from the top space of the water storage chamber 14 to the inside of the filter box 18 can be generated. When the amount of gas in the water storage chamber 14 is reduced, a one-way gas flow will be generated between the arc-shaped hollow bar 21, the first connecting pipe 15 and the water storage chamber 14. The gas flow can draw the dust generated by grinding into the water body for centralized collection to prevent the dust from spreading.

[0041] Next, the lifting mechanism is started, the hydraulic telescopic rod 4 is extended and retracted, and the welding head 7 is driven to rise and fall to a suitable position through the connecting plate 5 and the guide rod 6 to perform welding operations. During the welding process, the driving motor 13 can also be started to rotate the two tube bodies for comprehensive welding. In addition, when the driving motor 13 is running, the turntable 34 drives the piston plate 35 to move up and down in the piston cylinder 20 through the connecting rod 33. Through the action of the first one-way valve 38 and the second one-way valve 39, the circulating air flow of the arc hollow bar 21, the water storage chamber 14, the filter box 18, the piston cylinder 20 and the arc hollow bar 21 is realized. The circulating air flow first sucks the high-temperature fume generated by welding into the water storage chamber 14, absorbs the large particles of smoke and dust in the fume, and then cools the fume at the same time. The cooled fume can then be better adsorbed by the activated carbon block 19. In this way, the welding waste gas can be prevented from spreading to the surroundings and affecting the surrounding environment.

[0042] After the welding is completed, the welding of the welding head 7 is turned off, and the driving motor 13 is allowed to continue to start for a period of time. During this period of time, the circulating gas flow generated can cool the welding part of the pipe fitting, which is convenient for subsequent processing;

[0043] Finally, the driving motor 13 is turned off, and then the multiple electric telescopic rods 30 are started to retract, and finally the spliced ​​pipe fittings are removed.

[0044] A method for splicing clean pipes, using the above-mentioned splicing equipment, comprises the following steps:

[0045] Step 1: insert the two pipe bodies to be spliced ​​into the two installation tubes 9, open the sealing cover, and supply water into the water storage chamber 14. The height of the water body is not higher than the connection point between the second connecting pipe 36 and the water storage chamber 14;

[0046] Step 2: driving the electric telescopic rod 30 to extend, driving the arc clamping plate 31 to clamp the pipe, and then starting the driving motor 13 to operate;

[0047] Step 3: Start the hydraulic telescopic rod 4 to extend, drive the welding head 7 to rise and fall to a suitable position through the connecting plate 5 and the guide rod 6, and perform welding operation. During the welding process, the driving motor 13 can also be started;

[0048] Step 4: After the welding is completed, the welding of the welding head 7 is turned off, and the driving motor 13 is allowed to continue to start for a period of time. During this period of time, the circulating gas flow generated can cool the welding part of the pipe fitting to facilitate subsequent processing;

[0049] Step 5: Finally, turn off the drive motor 13, then start the multiple electric telescopic rods 30 to shrink, and finally remove the spliced ​​pipe fittings.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A splicing device for clean pipes, characterized in that: include: A base (1), the upper end of the base (1) being fixedly connected to a vertical plate (2), and the upper end of the vertical plate (2) being fixedly connected to a top plate (3); A positioning and mounting mechanism, the positioning and mounting mechanism comprising two mounting plates (8) symmetrically fixedly connected to the upper end of the base (1), the two mounting plates (8) being horizontally penetrated by mounting tubes (9), each mounting tube (9) being rotatably connected to the corresponding mounting plate (8) via a bearing, an electric telescopic rod (30) being mounted on the upper and lower sides of each mounting tube (9), the telescopic end of each electric telescopic rod (30) being fixedly connected to an arc-shaped clamping plate (31), and a rubber layer (32) being arranged on the inner side of each arc-shaped clamping plate (31); A welding mechanism, the welding mechanism comprising a connecting plate (5) arranged below the vertical plate (2), a welding head (7) being installed at the lower end of the connecting plate (5); A lifting mechanism, the lifting mechanism is used to lift the welding head (7) to achieve a welding connection operation; A grinding mechanism is installed above the base (1) and is used to grind the welded portion to improve the welding strength.

2. A splicing device for clean pipes according to claim 1, characterized in that: The lifting mechanism comprises a hydraulic telescopic rod (4) mounted on the upper end of the top plate (3); the telescopic end of the hydraulic telescopic rod (4) passes through the top plate (3) and is fixedly connected to the upper end of the connecting plate (5).

3. A splicing device for clean pipes according to claim 2, characterized in that: The upper end of the connecting plate (5) is symmetrically fixedly connected to two guide rods (6), and the upper ends of the two guide rods (6) both penetrate the top plate (3) and are slidably connected.

4. A splicing device for clean pipes according to claim 1, characterized in that: The grinding mechanism comprises a mounting frame (12) mounted on the right side of the base (1), a driving motor (13) being mounted on the mounting frame (12), an output shaft of the driving motor (13) passing through two mounting plates (8) in sequence, a rotating disk (24) passing through the middle of the output shaft of the driving motor (13), the output shaft of the driving motor (13) being fixedly connected to the rotating disk (24), a plurality of slide grooves (25) being provided on the outer side of the rotating disk (24), a slidable moving block (27) being provided in each of the slide grooves (25), a side of each of the moving blocks (27) close to the output shaft of the driving motor (13) being elastically connected to the inner wall of the corresponding slide groove (25) through a spring (26), the other side of each of the moving blocks (27) being fixedly connected to a connecting block (28), and the other side of each of the connecting blocks (28) being fixedly connected to a grinding head (29).

5. A splicing device for clean pipes according to claim 4, characterized in that: The two mounting cylinders (9) are both mounted with a first gear (10), the output shaft of the drive motor (13) is mounted with two second gears, and each of the first gears (10) is meshed with a corresponding second gear.

6. A splicing device for clean pipes according to claim 4, characterized in that: The base (1) is provided with a water storage chamber (14), a drainage port (16) is provided at the rear side of the inner bottom space of the water storage chamber (14), a sealing plug is installed in the drainage port (16), a fixing rod (40) is fixedly connected to the rear side of the vertical plate (2), an arc-shaped hollow bar (21) is fixedly connected to the front side of the fixing rod (40), a plurality of air holes (22) are provided on the inner side of the arc-shaped hollow bar (21), the arc-shaped hollow bar (21) is connected to the inner bottom space of the water storage chamber (14) through a first connecting pipe (15), a mounting groove (17) is provided at the front side of the base (1), a filter box (18) is installed in the mounting groove (17), an activated carbon block (19) is installed inside the filter box (18), and the right side space of the filter box (18) and the top space of the water storage chamber (14) are connected through a second connecting pipe (36).

7. A splicing device for clean pipes according to claim 6, characterized in that: A piston cylinder (20) is installed on the left side of the base (1), and a piston plate (35) that can slide up and down is arranged in the piston cylinder (20). The inner bottom space of the piston cylinder (20) is connected to the left side space of the filter box (18) through a first one-way tube (37), and the inner bottom space of the piston cylinder (20) is connected to the inner side of the arc-shaped hollow bar (21) through a second one-way tube (23). The output shaft of the drive motor (13) is fixedly connected to a turntable (34), and a connecting rod (33) is rotatably connected to the left eccentric position of the turntable (34), and the other end of the connecting rod (33) is fixedly connected to the upper end of the piston plate (35).

8. A splicing device for clean pipes according to claim 7, characterized in that: A second one-way valve (39) is installed inside the first one-way tube (37), and a first one-way valve (38) is installed inside the second one-way tube (23). The flow direction of the second one-way valve (39) is one-way from the filter box (18) to the bottom space of the piston cylinder (20), and the flow direction of the one-way valve inside the first one-way valve (38) is one-way from the bottom space of the piston cylinder (20) to the arc-shaped hollow bar (21).

9. A method for splicing clean pipes, characterized in that: Using the splicing device as claimed in any one of claims (1) to (8), comprising the following steps: The first step is to insert the two pipe bodies to be spliced ​​into the two installation tubes (9), open the sealing cover, and supply water into the water storage chamber (14), wherein the height of the water body is not higher than the connection point between the second connecting pipe (36) and the water storage chamber (14); Step 2: driving the electric telescopic rod (30) to extend, driving the arc clamping plate (31) to clamp the pipe, and then starting the driving motor (13) to operate; Step 3: Start the hydraulic telescopic rod (4) to extend, drive the welding head (7) to rise and fall to a suitable position through the connecting plate (5) and the guide rod (6), and perform welding operation. During the welding process, the driving motor (13) can also be started; Step 4: After the welding is completed, the welding of the welding head (7) is turned off, and the driving motor (13) is allowed to continue to start for a period of time. During this period of time, the circulating gas flow generated can cool the welding part of the pipe fitting, which is convenient for subsequent processing; Step 5: Finally, the driving motor (13) is turned off, and then the multiple electric telescopic rods (30) are started to retract, and finally the spliced ​​pipe fittings are removed.

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